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ed9a39eb | 1 | /* Common target dependent code for GDB on ARM systems. |
0fd88904 | 2 | |
0b302171 JB |
3 | Copyright (C) 1988-1989, 1991-1993, 1995-1996, 1998-2012 Free |
4 | Software Foundation, Inc. | |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c | 20 | |
0baeab03 PA |
21 | #include "defs.h" |
22 | ||
0963b4bd | 23 | #include <ctype.h> /* XXX for isupper (). */ |
34e8f22d | 24 | |
c906108c SS |
25 | #include "frame.h" |
26 | #include "inferior.h" | |
27 | #include "gdbcmd.h" | |
28 | #include "gdbcore.h" | |
c906108c | 29 | #include "gdb_string.h" |
0963b4bd | 30 | #include "dis-asm.h" /* For register styles. */ |
4e052eda | 31 | #include "regcache.h" |
54483882 | 32 | #include "reggroups.h" |
d16aafd8 | 33 | #include "doublest.h" |
fd0407d6 | 34 | #include "value.h" |
34e8f22d | 35 | #include "arch-utils.h" |
4be87837 | 36 | #include "osabi.h" |
eb5492fa DJ |
37 | #include "frame-unwind.h" |
38 | #include "frame-base.h" | |
39 | #include "trad-frame.h" | |
842e1f1e DJ |
40 | #include "objfiles.h" |
41 | #include "dwarf2-frame.h" | |
e4c16157 | 42 | #include "gdbtypes.h" |
29d73ae4 | 43 | #include "prologue-value.h" |
25f8c692 | 44 | #include "remote.h" |
123dc839 DJ |
45 | #include "target-descriptions.h" |
46 | #include "user-regs.h" | |
0e9e9abd | 47 | #include "observer.h" |
34e8f22d RE |
48 | |
49 | #include "arm-tdep.h" | |
26216b98 | 50 | #include "gdb/sim-arm.h" |
34e8f22d | 51 | |
082fc60d RE |
52 | #include "elf-bfd.h" |
53 | #include "coff/internal.h" | |
97e03143 | 54 | #include "elf/arm.h" |
c906108c | 55 | |
26216b98 | 56 | #include "gdb_assert.h" |
60c5725c | 57 | #include "vec.h" |
26216b98 | 58 | |
72508ac0 PO |
59 | #include "record.h" |
60 | ||
9779414d | 61 | #include "features/arm-with-m.c" |
25f8c692 | 62 | #include "features/arm-with-m-fpa-layout.c" |
3184d3f9 | 63 | #include "features/arm-with-m-vfp-d16.c" |
ef7e8358 UW |
64 | #include "features/arm-with-iwmmxt.c" |
65 | #include "features/arm-with-vfpv2.c" | |
66 | #include "features/arm-with-vfpv3.c" | |
67 | #include "features/arm-with-neon.c" | |
9779414d | 68 | |
6529d2dd AC |
69 | static int arm_debug; |
70 | ||
082fc60d RE |
71 | /* Macros for setting and testing a bit in a minimal symbol that marks |
72 | it as Thumb function. The MSB of the minimal symbol's "info" field | |
f594e5e9 | 73 | is used for this purpose. |
082fc60d RE |
74 | |
75 | MSYMBOL_SET_SPECIAL Actually sets the "special" bit. | |
f594e5e9 | 76 | MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */ |
082fc60d | 77 | |
0963b4bd | 78 | #define MSYMBOL_SET_SPECIAL(msym) \ |
b887350f | 79 | MSYMBOL_TARGET_FLAG_1 (msym) = 1 |
082fc60d RE |
80 | |
81 | #define MSYMBOL_IS_SPECIAL(msym) \ | |
b887350f | 82 | MSYMBOL_TARGET_FLAG_1 (msym) |
082fc60d | 83 | |
60c5725c DJ |
84 | /* Per-objfile data used for mapping symbols. */ |
85 | static const struct objfile_data *arm_objfile_data_key; | |
86 | ||
87 | struct arm_mapping_symbol | |
88 | { | |
89 | bfd_vma value; | |
90 | char type; | |
91 | }; | |
92 | typedef struct arm_mapping_symbol arm_mapping_symbol_s; | |
93 | DEF_VEC_O(arm_mapping_symbol_s); | |
94 | ||
95 | struct arm_per_objfile | |
96 | { | |
97 | VEC(arm_mapping_symbol_s) **section_maps; | |
98 | }; | |
99 | ||
afd7eef0 RE |
100 | /* The list of available "set arm ..." and "show arm ..." commands. */ |
101 | static struct cmd_list_element *setarmcmdlist = NULL; | |
102 | static struct cmd_list_element *showarmcmdlist = NULL; | |
103 | ||
fd50bc42 RE |
104 | /* The type of floating-point to use. Keep this in sync with enum |
105 | arm_float_model, and the help string in _initialize_arm_tdep. */ | |
40478521 | 106 | static const char *const fp_model_strings[] = |
fd50bc42 RE |
107 | { |
108 | "auto", | |
109 | "softfpa", | |
110 | "fpa", | |
111 | "softvfp", | |
28e97307 DJ |
112 | "vfp", |
113 | NULL | |
fd50bc42 RE |
114 | }; |
115 | ||
116 | /* A variable that can be configured by the user. */ | |
117 | static enum arm_float_model arm_fp_model = ARM_FLOAT_AUTO; | |
118 | static const char *current_fp_model = "auto"; | |
119 | ||
28e97307 | 120 | /* The ABI to use. Keep this in sync with arm_abi_kind. */ |
40478521 | 121 | static const char *const arm_abi_strings[] = |
28e97307 DJ |
122 | { |
123 | "auto", | |
124 | "APCS", | |
125 | "AAPCS", | |
126 | NULL | |
127 | }; | |
128 | ||
129 | /* A variable that can be configured by the user. */ | |
130 | static enum arm_abi_kind arm_abi_global = ARM_ABI_AUTO; | |
131 | static const char *arm_abi_string = "auto"; | |
132 | ||
0428b8f5 | 133 | /* The execution mode to assume. */ |
40478521 | 134 | static const char *const arm_mode_strings[] = |
0428b8f5 DJ |
135 | { |
136 | "auto", | |
137 | "arm", | |
68770265 MGD |
138 | "thumb", |
139 | NULL | |
0428b8f5 DJ |
140 | }; |
141 | ||
142 | static const char *arm_fallback_mode_string = "auto"; | |
143 | static const char *arm_force_mode_string = "auto"; | |
144 | ||
18819fa6 UW |
145 | /* Internal override of the execution mode. -1 means no override, |
146 | 0 means override to ARM mode, 1 means override to Thumb mode. | |
147 | The effect is the same as if arm_force_mode has been set by the | |
148 | user (except the internal override has precedence over a user's | |
149 | arm_force_mode override). */ | |
150 | static int arm_override_mode = -1; | |
151 | ||
94c30b78 | 152 | /* Number of different reg name sets (options). */ |
afd7eef0 | 153 | static int num_disassembly_options; |
bc90b915 | 154 | |
f32bf4a4 YQ |
155 | /* The standard register names, and all the valid aliases for them. Note |
156 | that `fp', `sp' and `pc' are not added in this alias list, because they | |
157 | have been added as builtin user registers in | |
158 | std-regs.c:_initialize_frame_reg. */ | |
123dc839 DJ |
159 | static const struct |
160 | { | |
161 | const char *name; | |
162 | int regnum; | |
163 | } arm_register_aliases[] = { | |
164 | /* Basic register numbers. */ | |
165 | { "r0", 0 }, | |
166 | { "r1", 1 }, | |
167 | { "r2", 2 }, | |
168 | { "r3", 3 }, | |
169 | { "r4", 4 }, | |
170 | { "r5", 5 }, | |
171 | { "r6", 6 }, | |
172 | { "r7", 7 }, | |
173 | { "r8", 8 }, | |
174 | { "r9", 9 }, | |
175 | { "r10", 10 }, | |
176 | { "r11", 11 }, | |
177 | { "r12", 12 }, | |
178 | { "r13", 13 }, | |
179 | { "r14", 14 }, | |
180 | { "r15", 15 }, | |
181 | /* Synonyms (argument and variable registers). */ | |
182 | { "a1", 0 }, | |
183 | { "a2", 1 }, | |
184 | { "a3", 2 }, | |
185 | { "a4", 3 }, | |
186 | { "v1", 4 }, | |
187 | { "v2", 5 }, | |
188 | { "v3", 6 }, | |
189 | { "v4", 7 }, | |
190 | { "v5", 8 }, | |
191 | { "v6", 9 }, | |
192 | { "v7", 10 }, | |
193 | { "v8", 11 }, | |
194 | /* Other platform-specific names for r9. */ | |
195 | { "sb", 9 }, | |
196 | { "tr", 9 }, | |
197 | /* Special names. */ | |
198 | { "ip", 12 }, | |
123dc839 | 199 | { "lr", 14 }, |
123dc839 DJ |
200 | /* Names used by GCC (not listed in the ARM EABI). */ |
201 | { "sl", 10 }, | |
123dc839 DJ |
202 | /* A special name from the older ATPCS. */ |
203 | { "wr", 7 }, | |
204 | }; | |
bc90b915 | 205 | |
123dc839 | 206 | static const char *const arm_register_names[] = |
da59e081 JM |
207 | {"r0", "r1", "r2", "r3", /* 0 1 2 3 */ |
208 | "r4", "r5", "r6", "r7", /* 4 5 6 7 */ | |
209 | "r8", "r9", "r10", "r11", /* 8 9 10 11 */ | |
210 | "r12", "sp", "lr", "pc", /* 12 13 14 15 */ | |
211 | "f0", "f1", "f2", "f3", /* 16 17 18 19 */ | |
212 | "f4", "f5", "f6", "f7", /* 20 21 22 23 */ | |
94c30b78 | 213 | "fps", "cpsr" }; /* 24 25 */ |
ed9a39eb | 214 | |
afd7eef0 RE |
215 | /* Valid register name styles. */ |
216 | static const char **valid_disassembly_styles; | |
ed9a39eb | 217 | |
afd7eef0 RE |
218 | /* Disassembly style to use. Default to "std" register names. */ |
219 | static const char *disassembly_style; | |
96baa820 | 220 | |
ed9a39eb | 221 | /* This is used to keep the bfd arch_info in sync with the disassembly |
afd7eef0 RE |
222 | style. */ |
223 | static void set_disassembly_style_sfunc(char *, int, | |
ed9a39eb | 224 | struct cmd_list_element *); |
afd7eef0 | 225 | static void set_disassembly_style (void); |
ed9a39eb | 226 | |
b508a996 | 227 | static void convert_from_extended (const struct floatformat *, const void *, |
be8626e0 | 228 | void *, int); |
b508a996 | 229 | static void convert_to_extended (const struct floatformat *, void *, |
be8626e0 | 230 | const void *, int); |
ed9a39eb | 231 | |
05d1431c PA |
232 | static enum register_status arm_neon_quad_read (struct gdbarch *gdbarch, |
233 | struct regcache *regcache, | |
234 | int regnum, gdb_byte *buf); | |
58d6951d DJ |
235 | static void arm_neon_quad_write (struct gdbarch *gdbarch, |
236 | struct regcache *regcache, | |
237 | int regnum, const gdb_byte *buf); | |
238 | ||
db24da6d YQ |
239 | static int thumb_insn_size (unsigned short inst1); |
240 | ||
9b8d791a | 241 | struct arm_prologue_cache |
c3b4394c | 242 | { |
eb5492fa DJ |
243 | /* The stack pointer at the time this frame was created; i.e. the |
244 | caller's stack pointer when this function was called. It is used | |
245 | to identify this frame. */ | |
246 | CORE_ADDR prev_sp; | |
247 | ||
4be43953 DJ |
248 | /* The frame base for this frame is just prev_sp - frame size. |
249 | FRAMESIZE is the distance from the frame pointer to the | |
250 | initial stack pointer. */ | |
eb5492fa | 251 | |
c3b4394c | 252 | int framesize; |
eb5492fa DJ |
253 | |
254 | /* The register used to hold the frame pointer for this frame. */ | |
c3b4394c | 255 | int framereg; |
eb5492fa DJ |
256 | |
257 | /* Saved register offsets. */ | |
258 | struct trad_frame_saved_reg *saved_regs; | |
c3b4394c | 259 | }; |
ed9a39eb | 260 | |
0d39a070 DJ |
261 | static CORE_ADDR arm_analyze_prologue (struct gdbarch *gdbarch, |
262 | CORE_ADDR prologue_start, | |
263 | CORE_ADDR prologue_end, | |
264 | struct arm_prologue_cache *cache); | |
265 | ||
cca44b1b JB |
266 | /* Architecture version for displaced stepping. This effects the behaviour of |
267 | certain instructions, and really should not be hard-wired. */ | |
268 | ||
269 | #define DISPLACED_STEPPING_ARCH_VERSION 5 | |
270 | ||
bc90b915 FN |
271 | /* Addresses for calling Thumb functions have the bit 0 set. |
272 | Here are some macros to test, set, or clear bit 0 of addresses. */ | |
273 | #define IS_THUMB_ADDR(addr) ((addr) & 1) | |
274 | #define MAKE_THUMB_ADDR(addr) ((addr) | 1) | |
275 | #define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1) | |
276 | ||
94c30b78 | 277 | /* Set to true if the 32-bit mode is in use. */ |
c906108c SS |
278 | |
279 | int arm_apcs_32 = 1; | |
280 | ||
9779414d DJ |
281 | /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */ |
282 | ||
478fd957 | 283 | int |
9779414d DJ |
284 | arm_psr_thumb_bit (struct gdbarch *gdbarch) |
285 | { | |
286 | if (gdbarch_tdep (gdbarch)->is_m) | |
287 | return XPSR_T; | |
288 | else | |
289 | return CPSR_T; | |
290 | } | |
291 | ||
b39cc962 DJ |
292 | /* Determine if FRAME is executing in Thumb mode. */ |
293 | ||
25b41d01 | 294 | int |
b39cc962 DJ |
295 | arm_frame_is_thumb (struct frame_info *frame) |
296 | { | |
297 | CORE_ADDR cpsr; | |
9779414d | 298 | ULONGEST t_bit = arm_psr_thumb_bit (get_frame_arch (frame)); |
b39cc962 DJ |
299 | |
300 | /* Every ARM frame unwinder can unwind the T bit of the CPSR, either | |
301 | directly (from a signal frame or dummy frame) or by interpreting | |
302 | the saved LR (from a prologue or DWARF frame). So consult it and | |
303 | trust the unwinders. */ | |
304 | cpsr = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
305 | ||
9779414d | 306 | return (cpsr & t_bit) != 0; |
b39cc962 DJ |
307 | } |
308 | ||
60c5725c DJ |
309 | /* Callback for VEC_lower_bound. */ |
310 | ||
311 | static inline int | |
312 | arm_compare_mapping_symbols (const struct arm_mapping_symbol *lhs, | |
313 | const struct arm_mapping_symbol *rhs) | |
314 | { | |
315 | return lhs->value < rhs->value; | |
316 | } | |
317 | ||
f9d67f43 DJ |
318 | /* Search for the mapping symbol covering MEMADDR. If one is found, |
319 | return its type. Otherwise, return 0. If START is non-NULL, | |
320 | set *START to the location of the mapping symbol. */ | |
c906108c | 321 | |
f9d67f43 DJ |
322 | static char |
323 | arm_find_mapping_symbol (CORE_ADDR memaddr, CORE_ADDR *start) | |
c906108c | 324 | { |
60c5725c | 325 | struct obj_section *sec; |
0428b8f5 | 326 | |
60c5725c DJ |
327 | /* If there are mapping symbols, consult them. */ |
328 | sec = find_pc_section (memaddr); | |
329 | if (sec != NULL) | |
330 | { | |
331 | struct arm_per_objfile *data; | |
332 | VEC(arm_mapping_symbol_s) *map; | |
aded6f54 PA |
333 | struct arm_mapping_symbol map_key = { memaddr - obj_section_addr (sec), |
334 | 0 }; | |
60c5725c DJ |
335 | unsigned int idx; |
336 | ||
337 | data = objfile_data (sec->objfile, arm_objfile_data_key); | |
338 | if (data != NULL) | |
339 | { | |
340 | map = data->section_maps[sec->the_bfd_section->index]; | |
341 | if (!VEC_empty (arm_mapping_symbol_s, map)) | |
342 | { | |
343 | struct arm_mapping_symbol *map_sym; | |
344 | ||
345 | idx = VEC_lower_bound (arm_mapping_symbol_s, map, &map_key, | |
346 | arm_compare_mapping_symbols); | |
347 | ||
348 | /* VEC_lower_bound finds the earliest ordered insertion | |
349 | point. If the following symbol starts at this exact | |
350 | address, we use that; otherwise, the preceding | |
351 | mapping symbol covers this address. */ | |
352 | if (idx < VEC_length (arm_mapping_symbol_s, map)) | |
353 | { | |
354 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx); | |
355 | if (map_sym->value == map_key.value) | |
f9d67f43 DJ |
356 | { |
357 | if (start) | |
358 | *start = map_sym->value + obj_section_addr (sec); | |
359 | return map_sym->type; | |
360 | } | |
60c5725c DJ |
361 | } |
362 | ||
363 | if (idx > 0) | |
364 | { | |
365 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx - 1); | |
f9d67f43 DJ |
366 | if (start) |
367 | *start = map_sym->value + obj_section_addr (sec); | |
368 | return map_sym->type; | |
60c5725c DJ |
369 | } |
370 | } | |
371 | } | |
372 | } | |
373 | ||
f9d67f43 DJ |
374 | return 0; |
375 | } | |
376 | ||
377 | /* Determine if the program counter specified in MEMADDR is in a Thumb | |
378 | function. This function should be called for addresses unrelated to | |
379 | any executing frame; otherwise, prefer arm_frame_is_thumb. */ | |
380 | ||
e3039479 | 381 | int |
9779414d | 382 | arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr) |
f9d67f43 | 383 | { |
f9d67f43 DJ |
384 | struct minimal_symbol *sym; |
385 | char type; | |
a42244db YQ |
386 | struct displaced_step_closure* dsc |
387 | = get_displaced_step_closure_by_addr(memaddr); | |
388 | ||
389 | /* If checking the mode of displaced instruction in copy area, the mode | |
390 | should be determined by instruction on the original address. */ | |
391 | if (dsc) | |
392 | { | |
393 | if (debug_displaced) | |
394 | fprintf_unfiltered (gdb_stdlog, | |
395 | "displaced: check mode of %.8lx instead of %.8lx\n", | |
396 | (unsigned long) dsc->insn_addr, | |
397 | (unsigned long) memaddr); | |
398 | memaddr = dsc->insn_addr; | |
399 | } | |
f9d67f43 DJ |
400 | |
401 | /* If bit 0 of the address is set, assume this is a Thumb address. */ | |
402 | if (IS_THUMB_ADDR (memaddr)) | |
403 | return 1; | |
404 | ||
18819fa6 UW |
405 | /* Respect internal mode override if active. */ |
406 | if (arm_override_mode != -1) | |
407 | return arm_override_mode; | |
408 | ||
f9d67f43 DJ |
409 | /* If the user wants to override the symbol table, let him. */ |
410 | if (strcmp (arm_force_mode_string, "arm") == 0) | |
411 | return 0; | |
412 | if (strcmp (arm_force_mode_string, "thumb") == 0) | |
413 | return 1; | |
414 | ||
9779414d DJ |
415 | /* ARM v6-M and v7-M are always in Thumb mode. */ |
416 | if (gdbarch_tdep (gdbarch)->is_m) | |
417 | return 1; | |
418 | ||
f9d67f43 DJ |
419 | /* If there are mapping symbols, consult them. */ |
420 | type = arm_find_mapping_symbol (memaddr, NULL); | |
421 | if (type) | |
422 | return type == 't'; | |
423 | ||
ed9a39eb | 424 | /* Thumb functions have a "special" bit set in minimal symbols. */ |
c906108c SS |
425 | sym = lookup_minimal_symbol_by_pc (memaddr); |
426 | if (sym) | |
0428b8f5 DJ |
427 | return (MSYMBOL_IS_SPECIAL (sym)); |
428 | ||
429 | /* If the user wants to override the fallback mode, let them. */ | |
430 | if (strcmp (arm_fallback_mode_string, "arm") == 0) | |
431 | return 0; | |
432 | if (strcmp (arm_fallback_mode_string, "thumb") == 0) | |
433 | return 1; | |
434 | ||
435 | /* If we couldn't find any symbol, but we're talking to a running | |
436 | target, then trust the current value of $cpsr. This lets | |
437 | "display/i $pc" always show the correct mode (though if there is | |
438 | a symbol table we will not reach here, so it still may not be | |
18819fa6 | 439 | displayed in the mode it will be executed). */ |
0428b8f5 | 440 | if (target_has_registers) |
18819fa6 | 441 | return arm_frame_is_thumb (get_current_frame ()); |
0428b8f5 DJ |
442 | |
443 | /* Otherwise we're out of luck; we assume ARM. */ | |
444 | return 0; | |
c906108c SS |
445 | } |
446 | ||
181c1381 | 447 | /* Remove useless bits from addresses in a running program. */ |
34e8f22d | 448 | static CORE_ADDR |
24568a2c | 449 | arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val) |
c906108c | 450 | { |
2ae28aa9 YQ |
451 | /* On M-profile devices, do not strip the low bit from EXC_RETURN |
452 | (the magic exception return address). */ | |
453 | if (gdbarch_tdep (gdbarch)->is_m | |
454 | && (val & 0xfffffff0) == 0xfffffff0) | |
455 | return val; | |
456 | ||
a3a2ee65 | 457 | if (arm_apcs_32) |
dd6be234 | 458 | return UNMAKE_THUMB_ADDR (val); |
c906108c | 459 | else |
a3a2ee65 | 460 | return (val & 0x03fffffc); |
c906108c SS |
461 | } |
462 | ||
0d39a070 | 463 | /* Return 1 if PC is the start of a compiler helper function which |
e0634ccf UW |
464 | can be safely ignored during prologue skipping. IS_THUMB is true |
465 | if the function is known to be a Thumb function due to the way it | |
466 | is being called. */ | |
0d39a070 | 467 | static int |
e0634ccf | 468 | skip_prologue_function (struct gdbarch *gdbarch, CORE_ADDR pc, int is_thumb) |
0d39a070 | 469 | { |
e0634ccf | 470 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
0d39a070 | 471 | struct minimal_symbol *msym; |
0d39a070 DJ |
472 | |
473 | msym = lookup_minimal_symbol_by_pc (pc); | |
e0634ccf UW |
474 | if (msym != NULL |
475 | && SYMBOL_VALUE_ADDRESS (msym) == pc | |
476 | && SYMBOL_LINKAGE_NAME (msym) != NULL) | |
477 | { | |
478 | const char *name = SYMBOL_LINKAGE_NAME (msym); | |
0d39a070 | 479 | |
e0634ccf UW |
480 | /* The GNU linker's Thumb call stub to foo is named |
481 | __foo_from_thumb. */ | |
482 | if (strstr (name, "_from_thumb") != NULL) | |
483 | name += 2; | |
0d39a070 | 484 | |
e0634ccf UW |
485 | /* On soft-float targets, __truncdfsf2 is called to convert promoted |
486 | arguments to their argument types in non-prototyped | |
487 | functions. */ | |
488 | if (strncmp (name, "__truncdfsf2", strlen ("__truncdfsf2")) == 0) | |
489 | return 1; | |
490 | if (strncmp (name, "__aeabi_d2f", strlen ("__aeabi_d2f")) == 0) | |
491 | return 1; | |
0d39a070 | 492 | |
e0634ccf UW |
493 | /* Internal functions related to thread-local storage. */ |
494 | if (strncmp (name, "__tls_get_addr", strlen ("__tls_get_addr")) == 0) | |
495 | return 1; | |
496 | if (strncmp (name, "__aeabi_read_tp", strlen ("__aeabi_read_tp")) == 0) | |
497 | return 1; | |
498 | } | |
499 | else | |
500 | { | |
501 | /* If we run against a stripped glibc, we may be unable to identify | |
502 | special functions by name. Check for one important case, | |
503 | __aeabi_read_tp, by comparing the *code* against the default | |
504 | implementation (this is hand-written ARM assembler in glibc). */ | |
505 | ||
506 | if (!is_thumb | |
507 | && read_memory_unsigned_integer (pc, 4, byte_order_for_code) | |
508 | == 0xe3e00a0f /* mov r0, #0xffff0fff */ | |
509 | && read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code) | |
510 | == 0xe240f01f) /* sub pc, r0, #31 */ | |
511 | return 1; | |
512 | } | |
ec3d575a | 513 | |
0d39a070 DJ |
514 | return 0; |
515 | } | |
516 | ||
517 | /* Support routines for instruction parsing. */ | |
518 | #define submask(x) ((1L << ((x) + 1)) - 1) | |
519 | #define bit(obj,st) (((obj) >> (st)) & 1) | |
520 | #define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) | |
521 | #define sbits(obj,st,fn) \ | |
522 | ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st)))) | |
523 | #define BranchDest(addr,instr) \ | |
524 | ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2))) | |
525 | ||
621c6d5b YQ |
526 | /* Extract the immediate from instruction movw/movt of encoding T. INSN1 is |
527 | the first 16-bit of instruction, and INSN2 is the second 16-bit of | |
528 | instruction. */ | |
529 | #define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \ | |
530 | ((bits ((insn1), 0, 3) << 12) \ | |
531 | | (bits ((insn1), 10, 10) << 11) \ | |
532 | | (bits ((insn2), 12, 14) << 8) \ | |
533 | | bits ((insn2), 0, 7)) | |
534 | ||
535 | /* Extract the immediate from instruction movw/movt of encoding A. INSN is | |
536 | the 32-bit instruction. */ | |
537 | #define EXTRACT_MOVW_MOVT_IMM_A(insn) \ | |
538 | ((bits ((insn), 16, 19) << 12) \ | |
539 | | bits ((insn), 0, 11)) | |
540 | ||
ec3d575a UW |
541 | /* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */ |
542 | ||
543 | static unsigned int | |
544 | thumb_expand_immediate (unsigned int imm) | |
545 | { | |
546 | unsigned int count = imm >> 7; | |
547 | ||
548 | if (count < 8) | |
549 | switch (count / 2) | |
550 | { | |
551 | case 0: | |
552 | return imm & 0xff; | |
553 | case 1: | |
554 | return (imm & 0xff) | ((imm & 0xff) << 16); | |
555 | case 2: | |
556 | return ((imm & 0xff) << 8) | ((imm & 0xff) << 24); | |
557 | case 3: | |
558 | return (imm & 0xff) | ((imm & 0xff) << 8) | |
559 | | ((imm & 0xff) << 16) | ((imm & 0xff) << 24); | |
560 | } | |
561 | ||
562 | return (0x80 | (imm & 0x7f)) << (32 - count); | |
563 | } | |
564 | ||
565 | /* Return 1 if the 16-bit Thumb instruction INST might change | |
566 | control flow, 0 otherwise. */ | |
567 | ||
568 | static int | |
569 | thumb_instruction_changes_pc (unsigned short inst) | |
570 | { | |
571 | if ((inst & 0xff00) == 0xbd00) /* pop {rlist, pc} */ | |
572 | return 1; | |
573 | ||
574 | if ((inst & 0xf000) == 0xd000) /* conditional branch */ | |
575 | return 1; | |
576 | ||
577 | if ((inst & 0xf800) == 0xe000) /* unconditional branch */ | |
578 | return 1; | |
579 | ||
580 | if ((inst & 0xff00) == 0x4700) /* bx REG, blx REG */ | |
581 | return 1; | |
582 | ||
ad8b5167 UW |
583 | if ((inst & 0xff87) == 0x4687) /* mov pc, REG */ |
584 | return 1; | |
585 | ||
ec3d575a UW |
586 | if ((inst & 0xf500) == 0xb100) /* CBNZ or CBZ. */ |
587 | return 1; | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | /* Return 1 if the 32-bit Thumb instruction in INST1 and INST2 | |
593 | might change control flow, 0 otherwise. */ | |
594 | ||
595 | static int | |
596 | thumb2_instruction_changes_pc (unsigned short inst1, unsigned short inst2) | |
597 | { | |
598 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) | |
599 | { | |
600 | /* Branches and miscellaneous control instructions. */ | |
601 | ||
602 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) | |
603 | { | |
604 | /* B, BL, BLX. */ | |
605 | return 1; | |
606 | } | |
607 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) | |
608 | { | |
609 | /* SUBS PC, LR, #imm8. */ | |
610 | return 1; | |
611 | } | |
612 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) | |
613 | { | |
614 | /* Conditional branch. */ | |
615 | return 1; | |
616 | } | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | if ((inst1 & 0xfe50) == 0xe810) | |
622 | { | |
623 | /* Load multiple or RFE. */ | |
624 | ||
625 | if (bit (inst1, 7) && !bit (inst1, 8)) | |
626 | { | |
627 | /* LDMIA or POP */ | |
628 | if (bit (inst2, 15)) | |
629 | return 1; | |
630 | } | |
631 | else if (!bit (inst1, 7) && bit (inst1, 8)) | |
632 | { | |
633 | /* LDMDB */ | |
634 | if (bit (inst2, 15)) | |
635 | return 1; | |
636 | } | |
637 | else if (bit (inst1, 7) && bit (inst1, 8)) | |
638 | { | |
639 | /* RFEIA */ | |
640 | return 1; | |
641 | } | |
642 | else if (!bit (inst1, 7) && !bit (inst1, 8)) | |
643 | { | |
644 | /* RFEDB */ | |
645 | return 1; | |
646 | } | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) | |
652 | { | |
653 | /* MOV PC or MOVS PC. */ | |
654 | return 1; | |
655 | } | |
656 | ||
657 | if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) | |
658 | { | |
659 | /* LDR PC. */ | |
660 | if (bits (inst1, 0, 3) == 15) | |
661 | return 1; | |
662 | if (bit (inst1, 7)) | |
663 | return 1; | |
664 | if (bit (inst2, 11)) | |
665 | return 1; | |
666 | if ((inst2 & 0x0fc0) == 0x0000) | |
667 | return 1; | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) | |
673 | { | |
674 | /* TBB. */ | |
675 | return 1; | |
676 | } | |
677 | ||
678 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) | |
679 | { | |
680 | /* TBH. */ | |
681 | return 1; | |
682 | } | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
29d73ae4 DJ |
687 | /* Analyze a Thumb prologue, looking for a recognizable stack frame |
688 | and frame pointer. Scan until we encounter a store that could | |
0d39a070 DJ |
689 | clobber the stack frame unexpectedly, or an unknown instruction. |
690 | Return the last address which is definitely safe to skip for an | |
691 | initial breakpoint. */ | |
c906108c SS |
692 | |
693 | static CORE_ADDR | |
29d73ae4 DJ |
694 | thumb_analyze_prologue (struct gdbarch *gdbarch, |
695 | CORE_ADDR start, CORE_ADDR limit, | |
696 | struct arm_prologue_cache *cache) | |
c906108c | 697 | { |
0d39a070 | 698 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
e17a4113 | 699 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
29d73ae4 DJ |
700 | int i; |
701 | pv_t regs[16]; | |
702 | struct pv_area *stack; | |
703 | struct cleanup *back_to; | |
704 | CORE_ADDR offset; | |
ec3d575a | 705 | CORE_ADDR unrecognized_pc = 0; |
da3c6d4a | 706 | |
29d73ae4 DJ |
707 | for (i = 0; i < 16; i++) |
708 | regs[i] = pv_register (i, 0); | |
55f960e1 | 709 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
29d73ae4 DJ |
710 | back_to = make_cleanup_free_pv_area (stack); |
711 | ||
29d73ae4 | 712 | while (start < limit) |
c906108c | 713 | { |
29d73ae4 DJ |
714 | unsigned short insn; |
715 | ||
e17a4113 | 716 | insn = read_memory_unsigned_integer (start, 2, byte_order_for_code); |
9d4fde75 | 717 | |
94c30b78 | 718 | if ((insn & 0xfe00) == 0xb400) /* push { rlist } */ |
da59e081 | 719 | { |
29d73ae4 DJ |
720 | int regno; |
721 | int mask; | |
4be43953 DJ |
722 | |
723 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) | |
724 | break; | |
29d73ae4 DJ |
725 | |
726 | /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says | |
727 | whether to save LR (R14). */ | |
728 | mask = (insn & 0xff) | ((insn & 0x100) << 6); | |
729 | ||
730 | /* Calculate offsets of saved R0-R7 and LR. */ | |
731 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
732 | if (mask & (1 << regno)) | |
733 | { | |
29d73ae4 DJ |
734 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
735 | -4); | |
736 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); | |
737 | } | |
da59e081 | 738 | } |
da3c6d4a MS |
739 | else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR |
740 | sub sp, #simm */ | |
da59e081 | 741 | { |
29d73ae4 DJ |
742 | offset = (insn & 0x7f) << 2; /* get scaled offset */ |
743 | if (insn & 0x80) /* Check for SUB. */ | |
744 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], | |
745 | -offset); | |
da59e081 | 746 | else |
29d73ae4 DJ |
747 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
748 | offset); | |
da59e081 | 749 | } |
0d39a070 DJ |
750 | else if ((insn & 0xf800) == 0xa800) /* add Rd, sp, #imm */ |
751 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[ARM_SP_REGNUM], | |
752 | (insn & 0xff) << 2); | |
753 | else if ((insn & 0xfe00) == 0x1c00 /* add Rd, Rn, #imm */ | |
754 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
755 | regs[bits (insn, 0, 2)] = pv_add_constant (regs[bits (insn, 3, 5)], | |
756 | bits (insn, 6, 8)); | |
757 | else if ((insn & 0xf800) == 0x3000 /* add Rd, #imm */ | |
758 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
759 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[bits (insn, 8, 10)], | |
760 | bits (insn, 0, 7)); | |
761 | else if ((insn & 0xfe00) == 0x1800 /* add Rd, Rn, Rm */ | |
762 | && pv_is_register (regs[bits (insn, 6, 8)], ARM_SP_REGNUM) | |
763 | && pv_is_constant (regs[bits (insn, 3, 5)])) | |
764 | regs[bits (insn, 0, 2)] = pv_add (regs[bits (insn, 3, 5)], | |
765 | regs[bits (insn, 6, 8)]); | |
766 | else if ((insn & 0xff00) == 0x4400 /* add Rd, Rm */ | |
767 | && pv_is_constant (regs[bits (insn, 3, 6)])) | |
768 | { | |
769 | int rd = (bit (insn, 7) << 3) + bits (insn, 0, 2); | |
770 | int rm = bits (insn, 3, 6); | |
771 | regs[rd] = pv_add (regs[rd], regs[rm]); | |
772 | } | |
29d73ae4 | 773 | else if ((insn & 0xff00) == 0x4600) /* mov hi, lo or mov lo, hi */ |
da59e081 | 774 | { |
29d73ae4 DJ |
775 | int dst_reg = (insn & 0x7) + ((insn & 0x80) >> 4); |
776 | int src_reg = (insn & 0x78) >> 3; | |
777 | regs[dst_reg] = regs[src_reg]; | |
da59e081 | 778 | } |
29d73ae4 | 779 | else if ((insn & 0xf800) == 0x9000) /* str rd, [sp, #off] */ |
da59e081 | 780 | { |
29d73ae4 DJ |
781 | /* Handle stores to the stack. Normally pushes are used, |
782 | but with GCC -mtpcs-frame, there may be other stores | |
783 | in the prologue to create the frame. */ | |
784 | int regno = (insn >> 8) & 0x7; | |
785 | pv_t addr; | |
786 | ||
787 | offset = (insn & 0xff) << 2; | |
788 | addr = pv_add_constant (regs[ARM_SP_REGNUM], offset); | |
789 | ||
790 | if (pv_area_store_would_trash (stack, addr)) | |
791 | break; | |
792 | ||
793 | pv_area_store (stack, addr, 4, regs[regno]); | |
da59e081 | 794 | } |
0d39a070 DJ |
795 | else if ((insn & 0xf800) == 0x6000) /* str rd, [rn, #off] */ |
796 | { | |
797 | int rd = bits (insn, 0, 2); | |
798 | int rn = bits (insn, 3, 5); | |
799 | pv_t addr; | |
800 | ||
801 | offset = bits (insn, 6, 10) << 2; | |
802 | addr = pv_add_constant (regs[rn], offset); | |
803 | ||
804 | if (pv_area_store_would_trash (stack, addr)) | |
805 | break; | |
806 | ||
807 | pv_area_store (stack, addr, 4, regs[rd]); | |
808 | } | |
809 | else if (((insn & 0xf800) == 0x7000 /* strb Rd, [Rn, #off] */ | |
810 | || (insn & 0xf800) == 0x8000) /* strh Rd, [Rn, #off] */ | |
811 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
812 | /* Ignore stores of argument registers to the stack. */ | |
813 | ; | |
814 | else if ((insn & 0xf800) == 0xc800 /* ldmia Rn!, { registers } */ | |
815 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
816 | /* Ignore block loads from the stack, potentially copying | |
817 | parameters from memory. */ | |
818 | ; | |
819 | else if ((insn & 0xf800) == 0x9800 /* ldr Rd, [Rn, #immed] */ | |
820 | || ((insn & 0xf800) == 0x6800 /* ldr Rd, [sp, #immed] */ | |
821 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM))) | |
822 | /* Similarly ignore single loads from the stack. */ | |
823 | ; | |
824 | else if ((insn & 0xffc0) == 0x0000 /* lsls Rd, Rm, #0 */ | |
825 | || (insn & 0xffc0) == 0x1c00) /* add Rd, Rn, #0 */ | |
826 | /* Skip register copies, i.e. saves to another register | |
827 | instead of the stack. */ | |
828 | ; | |
829 | else if ((insn & 0xf800) == 0x2000) /* movs Rd, #imm */ | |
830 | /* Recognize constant loads; even with small stacks these are necessary | |
831 | on Thumb. */ | |
832 | regs[bits (insn, 8, 10)] = pv_constant (bits (insn, 0, 7)); | |
833 | else if ((insn & 0xf800) == 0x4800) /* ldr Rd, [pc, #imm] */ | |
834 | { | |
835 | /* Constant pool loads, for the same reason. */ | |
836 | unsigned int constant; | |
837 | CORE_ADDR loc; | |
838 | ||
839 | loc = start + 4 + bits (insn, 0, 7) * 4; | |
840 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
841 | regs[bits (insn, 8, 10)] = pv_constant (constant); | |
842 | } | |
db24da6d | 843 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instructions. */ |
0d39a070 | 844 | { |
0d39a070 DJ |
845 | unsigned short inst2; |
846 | ||
847 | inst2 = read_memory_unsigned_integer (start + 2, 2, | |
848 | byte_order_for_code); | |
849 | ||
850 | if ((insn & 0xf800) == 0xf000 && (inst2 & 0xe800) == 0xe800) | |
851 | { | |
852 | /* BL, BLX. Allow some special function calls when | |
853 | skipping the prologue; GCC generates these before | |
854 | storing arguments to the stack. */ | |
855 | CORE_ADDR nextpc; | |
856 | int j1, j2, imm1, imm2; | |
857 | ||
858 | imm1 = sbits (insn, 0, 10); | |
859 | imm2 = bits (inst2, 0, 10); | |
860 | j1 = bit (inst2, 13); | |
861 | j2 = bit (inst2, 11); | |
862 | ||
863 | offset = ((imm1 << 12) + (imm2 << 1)); | |
864 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
865 | ||
866 | nextpc = start + 4 + offset; | |
867 | /* For BLX make sure to clear the low bits. */ | |
868 | if (bit (inst2, 12) == 0) | |
869 | nextpc = nextpc & 0xfffffffc; | |
870 | ||
e0634ccf UW |
871 | if (!skip_prologue_function (gdbarch, nextpc, |
872 | bit (inst2, 12) != 0)) | |
0d39a070 DJ |
873 | break; |
874 | } | |
ec3d575a | 875 | |
0963b4bd MS |
876 | else if ((insn & 0xffd0) == 0xe900 /* stmdb Rn{!}, |
877 | { registers } */ | |
ec3d575a UW |
878 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
879 | { | |
880 | pv_t addr = regs[bits (insn, 0, 3)]; | |
881 | int regno; | |
882 | ||
883 | if (pv_area_store_would_trash (stack, addr)) | |
884 | break; | |
885 | ||
886 | /* Calculate offsets of saved registers. */ | |
887 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
888 | if (inst2 & (1 << regno)) | |
889 | { | |
890 | addr = pv_add_constant (addr, -4); | |
891 | pv_area_store (stack, addr, 4, regs[regno]); | |
892 | } | |
893 | ||
894 | if (insn & 0x0020) | |
895 | regs[bits (insn, 0, 3)] = addr; | |
896 | } | |
897 | ||
0963b4bd MS |
898 | else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2, |
899 | [Rn, #+/-imm]{!} */ | |
ec3d575a UW |
900 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
901 | { | |
902 | int regno1 = bits (inst2, 12, 15); | |
903 | int regno2 = bits (inst2, 8, 11); | |
904 | pv_t addr = regs[bits (insn, 0, 3)]; | |
905 | ||
906 | offset = inst2 & 0xff; | |
907 | if (insn & 0x0080) | |
908 | addr = pv_add_constant (addr, offset); | |
909 | else | |
910 | addr = pv_add_constant (addr, -offset); | |
911 | ||
912 | if (pv_area_store_would_trash (stack, addr)) | |
913 | break; | |
914 | ||
915 | pv_area_store (stack, addr, 4, regs[regno1]); | |
916 | pv_area_store (stack, pv_add_constant (addr, 4), | |
917 | 4, regs[regno2]); | |
918 | ||
919 | if (insn & 0x0020) | |
920 | regs[bits (insn, 0, 3)] = addr; | |
921 | } | |
922 | ||
923 | else if ((insn & 0xfff0) == 0xf8c0 /* str Rt,[Rn,+/-#imm]{!} */ | |
924 | && (inst2 & 0x0c00) == 0x0c00 | |
925 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
926 | { | |
927 | int regno = bits (inst2, 12, 15); | |
928 | pv_t addr = regs[bits (insn, 0, 3)]; | |
929 | ||
930 | offset = inst2 & 0xff; | |
931 | if (inst2 & 0x0200) | |
932 | addr = pv_add_constant (addr, offset); | |
933 | else | |
934 | addr = pv_add_constant (addr, -offset); | |
935 | ||
936 | if (pv_area_store_would_trash (stack, addr)) | |
937 | break; | |
938 | ||
939 | pv_area_store (stack, addr, 4, regs[regno]); | |
940 | ||
941 | if (inst2 & 0x0100) | |
942 | regs[bits (insn, 0, 3)] = addr; | |
943 | } | |
944 | ||
945 | else if ((insn & 0xfff0) == 0xf8c0 /* str.w Rt,[Rn,#imm] */ | |
946 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
947 | { | |
948 | int regno = bits (inst2, 12, 15); | |
949 | pv_t addr; | |
950 | ||
951 | offset = inst2 & 0xfff; | |
952 | addr = pv_add_constant (regs[bits (insn, 0, 3)], offset); | |
953 | ||
954 | if (pv_area_store_would_trash (stack, addr)) | |
955 | break; | |
956 | ||
957 | pv_area_store (stack, addr, 4, regs[regno]); | |
958 | } | |
959 | ||
960 | else if ((insn & 0xffd0) == 0xf880 /* str{bh}.w Rt,[Rn,#imm] */ | |
0d39a070 | 961 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 962 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 963 | ; |
ec3d575a UW |
964 | |
965 | else if ((insn & 0xffd0) == 0xf800 /* str{bh} Rt,[Rn,#+/-imm] */ | |
966 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 967 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 968 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 969 | ; |
ec3d575a | 970 | |
0963b4bd MS |
971 | else if ((insn & 0xffd0) == 0xe890 /* ldmia Rn[!], |
972 | { registers } */ | |
ec3d575a UW |
973 | && (inst2 & 0x8000) == 0x0000 |
974 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
975 | /* Ignore block loads from the stack, potentially copying | |
976 | parameters from memory. */ | |
0d39a070 | 977 | ; |
ec3d575a | 978 | |
0963b4bd MS |
979 | else if ((insn & 0xffb0) == 0xe950 /* ldrd Rt, Rt2, |
980 | [Rn, #+/-imm] */ | |
0d39a070 | 981 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 982 | /* Similarly ignore dual loads from the stack. */ |
0d39a070 | 983 | ; |
ec3d575a UW |
984 | |
985 | else if ((insn & 0xfff0) == 0xf850 /* ldr Rt,[Rn,#+/-imm] */ | |
986 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 987 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 988 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 989 | ; |
ec3d575a UW |
990 | |
991 | else if ((insn & 0xfff0) == 0xf8d0 /* ldr.w Rt,[Rn,#imm] */ | |
0d39a070 | 992 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 993 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 994 | ; |
ec3d575a UW |
995 | |
996 | else if ((insn & 0xfbf0) == 0xf100 /* add.w Rd, Rn, #imm */ | |
997 | && (inst2 & 0x8000) == 0x0000) | |
998 | { | |
999 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1000 | | (bits (inst2, 12, 14) << 8) | |
1001 | | bits (inst2, 0, 7)); | |
1002 | ||
1003 | regs[bits (inst2, 8, 11)] | |
1004 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
1005 | thumb_expand_immediate (imm)); | |
1006 | } | |
1007 | ||
1008 | else if ((insn & 0xfbf0) == 0xf200 /* addw Rd, Rn, #imm */ | |
1009 | && (inst2 & 0x8000) == 0x0000) | |
0d39a070 | 1010 | { |
ec3d575a UW |
1011 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
1012 | | (bits (inst2, 12, 14) << 8) | |
1013 | | bits (inst2, 0, 7)); | |
1014 | ||
1015 | regs[bits (inst2, 8, 11)] | |
1016 | = pv_add_constant (regs[bits (insn, 0, 3)], imm); | |
1017 | } | |
1018 | ||
1019 | else if ((insn & 0xfbf0) == 0xf1a0 /* sub.w Rd, Rn, #imm */ | |
1020 | && (inst2 & 0x8000) == 0x0000) | |
1021 | { | |
1022 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1023 | | (bits (inst2, 12, 14) << 8) | |
1024 | | bits (inst2, 0, 7)); | |
1025 | ||
1026 | regs[bits (inst2, 8, 11)] | |
1027 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
1028 | - (CORE_ADDR) thumb_expand_immediate (imm)); | |
1029 | } | |
1030 | ||
1031 | else if ((insn & 0xfbf0) == 0xf2a0 /* subw Rd, Rn, #imm */ | |
1032 | && (inst2 & 0x8000) == 0x0000) | |
1033 | { | |
1034 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1035 | | (bits (inst2, 12, 14) << 8) | |
1036 | | bits (inst2, 0, 7)); | |
1037 | ||
1038 | regs[bits (inst2, 8, 11)] | |
1039 | = pv_add_constant (regs[bits (insn, 0, 3)], - (CORE_ADDR) imm); | |
1040 | } | |
1041 | ||
1042 | else if ((insn & 0xfbff) == 0xf04f) /* mov.w Rd, #const */ | |
1043 | { | |
1044 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1045 | | (bits (inst2, 12, 14) << 8) | |
1046 | | bits (inst2, 0, 7)); | |
1047 | ||
1048 | regs[bits (inst2, 8, 11)] | |
1049 | = pv_constant (thumb_expand_immediate (imm)); | |
1050 | } | |
1051 | ||
1052 | else if ((insn & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1053 | { | |
621c6d5b YQ |
1054 | unsigned int imm |
1055 | = EXTRACT_MOVW_MOVT_IMM_T (insn, inst2); | |
ec3d575a UW |
1056 | |
1057 | regs[bits (inst2, 8, 11)] = pv_constant (imm); | |
1058 | } | |
1059 | ||
1060 | else if (insn == 0xea5f /* mov.w Rd,Rm */ | |
1061 | && (inst2 & 0xf0f0) == 0) | |
1062 | { | |
1063 | int dst_reg = (inst2 & 0x0f00) >> 8; | |
1064 | int src_reg = inst2 & 0xf; | |
1065 | regs[dst_reg] = regs[src_reg]; | |
1066 | } | |
1067 | ||
1068 | else if ((insn & 0xff7f) == 0xf85f) /* ldr.w Rt,<label> */ | |
1069 | { | |
1070 | /* Constant pool loads. */ | |
1071 | unsigned int constant; | |
1072 | CORE_ADDR loc; | |
1073 | ||
1074 | offset = bits (insn, 0, 11); | |
1075 | if (insn & 0x0080) | |
1076 | loc = start + 4 + offset; | |
1077 | else | |
1078 | loc = start + 4 - offset; | |
1079 | ||
1080 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1081 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1082 | } | |
1083 | ||
1084 | else if ((insn & 0xff7f) == 0xe95f) /* ldrd Rt,Rt2,<label> */ | |
1085 | { | |
1086 | /* Constant pool loads. */ | |
1087 | unsigned int constant; | |
1088 | CORE_ADDR loc; | |
1089 | ||
1090 | offset = bits (insn, 0, 7) << 2; | |
1091 | if (insn & 0x0080) | |
1092 | loc = start + 4 + offset; | |
1093 | else | |
1094 | loc = start + 4 - offset; | |
1095 | ||
1096 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1097 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1098 | ||
1099 | constant = read_memory_unsigned_integer (loc + 4, 4, byte_order); | |
1100 | regs[bits (inst2, 8, 11)] = pv_constant (constant); | |
1101 | } | |
1102 | ||
1103 | else if (thumb2_instruction_changes_pc (insn, inst2)) | |
1104 | { | |
1105 | /* Don't scan past anything that might change control flow. */ | |
0d39a070 DJ |
1106 | break; |
1107 | } | |
ec3d575a UW |
1108 | else |
1109 | { | |
1110 | /* The optimizer might shove anything into the prologue, | |
1111 | so we just skip what we don't recognize. */ | |
1112 | unrecognized_pc = start; | |
1113 | } | |
0d39a070 DJ |
1114 | |
1115 | start += 2; | |
1116 | } | |
ec3d575a | 1117 | else if (thumb_instruction_changes_pc (insn)) |
3d74b771 | 1118 | { |
ec3d575a | 1119 | /* Don't scan past anything that might change control flow. */ |
da3c6d4a | 1120 | break; |
3d74b771 | 1121 | } |
ec3d575a UW |
1122 | else |
1123 | { | |
1124 | /* The optimizer might shove anything into the prologue, | |
1125 | so we just skip what we don't recognize. */ | |
1126 | unrecognized_pc = start; | |
1127 | } | |
29d73ae4 DJ |
1128 | |
1129 | start += 2; | |
c906108c SS |
1130 | } |
1131 | ||
0d39a070 DJ |
1132 | if (arm_debug) |
1133 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1134 | paddress (gdbarch, start)); | |
1135 | ||
ec3d575a UW |
1136 | if (unrecognized_pc == 0) |
1137 | unrecognized_pc = start; | |
1138 | ||
29d73ae4 DJ |
1139 | if (cache == NULL) |
1140 | { | |
1141 | do_cleanups (back_to); | |
ec3d575a | 1142 | return unrecognized_pc; |
29d73ae4 DJ |
1143 | } |
1144 | ||
29d73ae4 DJ |
1145 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) |
1146 | { | |
1147 | /* Frame pointer is fp. Frame size is constant. */ | |
1148 | cache->framereg = ARM_FP_REGNUM; | |
1149 | cache->framesize = -regs[ARM_FP_REGNUM].k; | |
1150 | } | |
1151 | else if (pv_is_register (regs[THUMB_FP_REGNUM], ARM_SP_REGNUM)) | |
1152 | { | |
1153 | /* Frame pointer is r7. Frame size is constant. */ | |
1154 | cache->framereg = THUMB_FP_REGNUM; | |
1155 | cache->framesize = -regs[THUMB_FP_REGNUM].k; | |
1156 | } | |
72a2e3dc | 1157 | else |
29d73ae4 DJ |
1158 | { |
1159 | /* Try the stack pointer... this is a bit desperate. */ | |
1160 | cache->framereg = ARM_SP_REGNUM; | |
1161 | cache->framesize = -regs[ARM_SP_REGNUM].k; | |
1162 | } | |
29d73ae4 DJ |
1163 | |
1164 | for (i = 0; i < 16; i++) | |
1165 | if (pv_area_find_reg (stack, gdbarch, i, &offset)) | |
1166 | cache->saved_regs[i].addr = offset; | |
1167 | ||
1168 | do_cleanups (back_to); | |
ec3d575a | 1169 | return unrecognized_pc; |
c906108c SS |
1170 | } |
1171 | ||
621c6d5b YQ |
1172 | |
1173 | /* Try to analyze the instructions starting from PC, which load symbol | |
1174 | __stack_chk_guard. Return the address of instruction after loading this | |
1175 | symbol, set the dest register number to *BASEREG, and set the size of | |
1176 | instructions for loading symbol in OFFSET. Return 0 if instructions are | |
1177 | not recognized. */ | |
1178 | ||
1179 | static CORE_ADDR | |
1180 | arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch, | |
1181 | unsigned int *destreg, int *offset) | |
1182 | { | |
1183 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1184 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1185 | unsigned int low, high, address; | |
1186 | ||
1187 | address = 0; | |
1188 | if (is_thumb) | |
1189 | { | |
1190 | unsigned short insn1 | |
1191 | = read_memory_unsigned_integer (pc, 2, byte_order_for_code); | |
1192 | ||
1193 | if ((insn1 & 0xf800) == 0x4800) /* ldr Rd, #immed */ | |
1194 | { | |
1195 | *destreg = bits (insn1, 8, 10); | |
1196 | *offset = 2; | |
1197 | address = bits (insn1, 0, 7); | |
1198 | } | |
1199 | else if ((insn1 & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1200 | { | |
1201 | unsigned short insn2 | |
1202 | = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); | |
1203 | ||
1204 | low = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1205 | ||
1206 | insn1 | |
1207 | = read_memory_unsigned_integer (pc + 4, 2, byte_order_for_code); | |
1208 | insn2 | |
1209 | = read_memory_unsigned_integer (pc + 6, 2, byte_order_for_code); | |
1210 | ||
1211 | /* movt Rd, #const */ | |
1212 | if ((insn1 & 0xfbc0) == 0xf2c0) | |
1213 | { | |
1214 | high = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1215 | *destreg = bits (insn2, 8, 11); | |
1216 | *offset = 8; | |
1217 | address = (high << 16 | low); | |
1218 | } | |
1219 | } | |
1220 | } | |
1221 | else | |
1222 | { | |
2e9e421f UW |
1223 | unsigned int insn |
1224 | = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
1225 | ||
1226 | if ((insn & 0x0e5f0000) == 0x041f0000) /* ldr Rd, #immed */ | |
1227 | { | |
1228 | address = bits (insn, 0, 11); | |
1229 | *destreg = bits (insn, 12, 15); | |
1230 | *offset = 4; | |
1231 | } | |
1232 | else if ((insn & 0x0ff00000) == 0x03000000) /* movw Rd, #const */ | |
1233 | { | |
1234 | low = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1235 | ||
1236 | insn | |
1237 | = read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code); | |
1238 | ||
1239 | if ((insn & 0x0ff00000) == 0x03400000) /* movt Rd, #const */ | |
1240 | { | |
1241 | high = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1242 | *destreg = bits (insn, 12, 15); | |
1243 | *offset = 8; | |
1244 | address = (high << 16 | low); | |
1245 | } | |
1246 | } | |
621c6d5b YQ |
1247 | } |
1248 | ||
1249 | return address; | |
1250 | } | |
1251 | ||
1252 | /* Try to skip a sequence of instructions used for stack protector. If PC | |
0963b4bd MS |
1253 | points to the first instruction of this sequence, return the address of |
1254 | first instruction after this sequence, otherwise, return original PC. | |
621c6d5b YQ |
1255 | |
1256 | On arm, this sequence of instructions is composed of mainly three steps, | |
1257 | Step 1: load symbol __stack_chk_guard, | |
1258 | Step 2: load from address of __stack_chk_guard, | |
1259 | Step 3: store it to somewhere else. | |
1260 | ||
1261 | Usually, instructions on step 2 and step 3 are the same on various ARM | |
1262 | architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and | |
1263 | on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However, | |
1264 | instructions in step 1 vary from different ARM architectures. On ARMv7, | |
1265 | they are, | |
1266 | ||
1267 | movw Rn, #:lower16:__stack_chk_guard | |
1268 | movt Rn, #:upper16:__stack_chk_guard | |
1269 | ||
1270 | On ARMv5t, it is, | |
1271 | ||
1272 | ldr Rn, .Label | |
1273 | .... | |
1274 | .Lable: | |
1275 | .word __stack_chk_guard | |
1276 | ||
1277 | Since ldr/str is a very popular instruction, we can't use them as | |
1278 | 'fingerprint' or 'signature' of stack protector sequence. Here we choose | |
1279 | sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not | |
1280 | stripped, as the 'fingerprint' of a stack protector cdoe sequence. */ | |
1281 | ||
1282 | static CORE_ADDR | |
1283 | arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch) | |
1284 | { | |
1285 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
22e048c9 | 1286 | unsigned int basereg; |
621c6d5b YQ |
1287 | struct minimal_symbol *stack_chk_guard; |
1288 | int offset; | |
1289 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1290 | CORE_ADDR addr; | |
1291 | ||
1292 | /* Try to parse the instructions in Step 1. */ | |
1293 | addr = arm_analyze_load_stack_chk_guard (pc, gdbarch, | |
1294 | &basereg, &offset); | |
1295 | if (!addr) | |
1296 | return pc; | |
1297 | ||
1298 | stack_chk_guard = lookup_minimal_symbol_by_pc (addr); | |
1299 | /* If name of symbol doesn't start with '__stack_chk_guard', this | |
1300 | instruction sequence is not for stack protector. If symbol is | |
1301 | removed, we conservatively think this sequence is for stack protector. */ | |
1302 | if (stack_chk_guard | |
c1c2ab58 UW |
1303 | && strncmp (SYMBOL_LINKAGE_NAME (stack_chk_guard), "__stack_chk_guard", |
1304 | strlen ("__stack_chk_guard")) != 0) | |
621c6d5b YQ |
1305 | return pc; |
1306 | ||
1307 | if (is_thumb) | |
1308 | { | |
1309 | unsigned int destreg; | |
1310 | unsigned short insn | |
1311 | = read_memory_unsigned_integer (pc + offset, 2, byte_order_for_code); | |
1312 | ||
1313 | /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */ | |
1314 | if ((insn & 0xf800) != 0x6800) | |
1315 | return pc; | |
1316 | if (bits (insn, 3, 5) != basereg) | |
1317 | return pc; | |
1318 | destreg = bits (insn, 0, 2); | |
1319 | ||
1320 | insn = read_memory_unsigned_integer (pc + offset + 2, 2, | |
1321 | byte_order_for_code); | |
1322 | /* Step 3: str Rd, [Rn, #immed], encoding T1. */ | |
1323 | if ((insn & 0xf800) != 0x6000) | |
1324 | return pc; | |
1325 | if (destreg != bits (insn, 0, 2)) | |
1326 | return pc; | |
1327 | } | |
1328 | else | |
1329 | { | |
1330 | unsigned int destreg; | |
1331 | unsigned int insn | |
1332 | = read_memory_unsigned_integer (pc + offset, 4, byte_order_for_code); | |
1333 | ||
1334 | /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */ | |
1335 | if ((insn & 0x0e500000) != 0x04100000) | |
1336 | return pc; | |
1337 | if (bits (insn, 16, 19) != basereg) | |
1338 | return pc; | |
1339 | destreg = bits (insn, 12, 15); | |
1340 | /* Step 3: str Rd, [Rn, #immed], encoding A1. */ | |
1341 | insn = read_memory_unsigned_integer (pc + offset + 4, | |
1342 | 4, byte_order_for_code); | |
1343 | if ((insn & 0x0e500000) != 0x04000000) | |
1344 | return pc; | |
1345 | if (bits (insn, 12, 15) != destreg) | |
1346 | return pc; | |
1347 | } | |
1348 | /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8 | |
1349 | on arm. */ | |
1350 | if (is_thumb) | |
1351 | return pc + offset + 4; | |
1352 | else | |
1353 | return pc + offset + 8; | |
1354 | } | |
1355 | ||
da3c6d4a MS |
1356 | /* Advance the PC across any function entry prologue instructions to |
1357 | reach some "real" code. | |
34e8f22d RE |
1358 | |
1359 | The APCS (ARM Procedure Call Standard) defines the following | |
ed9a39eb | 1360 | prologue: |
c906108c | 1361 | |
c5aa993b JM |
1362 | mov ip, sp |
1363 | [stmfd sp!, {a1,a2,a3,a4}] | |
1364 | stmfd sp!, {...,fp,ip,lr,pc} | |
ed9a39eb JM |
1365 | [stfe f7, [sp, #-12]!] |
1366 | [stfe f6, [sp, #-12]!] | |
1367 | [stfe f5, [sp, #-12]!] | |
1368 | [stfe f4, [sp, #-12]!] | |
0963b4bd | 1369 | sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */ |
c906108c | 1370 | |
34e8f22d | 1371 | static CORE_ADDR |
6093d2eb | 1372 | arm_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
c906108c | 1373 | { |
e17a4113 | 1374 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
c906108c SS |
1375 | unsigned long inst; |
1376 | CORE_ADDR skip_pc; | |
a89fea3c | 1377 | CORE_ADDR func_addr, limit_pc; |
c906108c | 1378 | |
a89fea3c JL |
1379 | /* See if we can determine the end of the prologue via the symbol table. |
1380 | If so, then return either PC, or the PC after the prologue, whichever | |
1381 | is greater. */ | |
1382 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
c906108c | 1383 | { |
d80b854b UW |
1384 | CORE_ADDR post_prologue_pc |
1385 | = skip_prologue_using_sal (gdbarch, func_addr); | |
0d39a070 DJ |
1386 | struct symtab *s = find_pc_symtab (func_addr); |
1387 | ||
621c6d5b YQ |
1388 | if (post_prologue_pc) |
1389 | post_prologue_pc | |
1390 | = arm_skip_stack_protector (post_prologue_pc, gdbarch); | |
1391 | ||
1392 | ||
0d39a070 DJ |
1393 | /* GCC always emits a line note before the prologue and another |
1394 | one after, even if the two are at the same address or on the | |
1395 | same line. Take advantage of this so that we do not need to | |
1396 | know every instruction that might appear in the prologue. We | |
1397 | will have producer information for most binaries; if it is | |
1398 | missing (e.g. for -gstabs), assuming the GNU tools. */ | |
1399 | if (post_prologue_pc | |
1400 | && (s == NULL | |
1401 | || s->producer == NULL | |
9ead7ae4 KB |
1402 | || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0 |
1403 | || strncmp (s->producer, "clang ", sizeof ("clang ") - 1) == 0)) | |
0d39a070 DJ |
1404 | return post_prologue_pc; |
1405 | ||
a89fea3c | 1406 | if (post_prologue_pc != 0) |
0d39a070 DJ |
1407 | { |
1408 | CORE_ADDR analyzed_limit; | |
1409 | ||
1410 | /* For non-GCC compilers, make sure the entire line is an | |
1411 | acceptable prologue; GDB will round this function's | |
1412 | return value up to the end of the following line so we | |
1413 | can not skip just part of a line (and we do not want to). | |
1414 | ||
1415 | RealView does not treat the prologue specially, but does | |
1416 | associate prologue code with the opening brace; so this | |
1417 | lets us skip the first line if we think it is the opening | |
1418 | brace. */ | |
9779414d | 1419 | if (arm_pc_is_thumb (gdbarch, func_addr)) |
0d39a070 DJ |
1420 | analyzed_limit = thumb_analyze_prologue (gdbarch, func_addr, |
1421 | post_prologue_pc, NULL); | |
1422 | else | |
1423 | analyzed_limit = arm_analyze_prologue (gdbarch, func_addr, | |
1424 | post_prologue_pc, NULL); | |
1425 | ||
1426 | if (analyzed_limit != post_prologue_pc) | |
1427 | return func_addr; | |
1428 | ||
1429 | return post_prologue_pc; | |
1430 | } | |
c906108c SS |
1431 | } |
1432 | ||
a89fea3c JL |
1433 | /* Can't determine prologue from the symbol table, need to examine |
1434 | instructions. */ | |
c906108c | 1435 | |
a89fea3c JL |
1436 | /* Find an upper limit on the function prologue using the debug |
1437 | information. If the debug information could not be used to provide | |
1438 | that bound, then use an arbitrary large number as the upper bound. */ | |
0963b4bd | 1439 | /* Like arm_scan_prologue, stop no later than pc + 64. */ |
d80b854b | 1440 | limit_pc = skip_prologue_using_sal (gdbarch, pc); |
a89fea3c JL |
1441 | if (limit_pc == 0) |
1442 | limit_pc = pc + 64; /* Magic. */ | |
1443 | ||
c906108c | 1444 | |
29d73ae4 | 1445 | /* Check if this is Thumb code. */ |
9779414d | 1446 | if (arm_pc_is_thumb (gdbarch, pc)) |
a89fea3c | 1447 | return thumb_analyze_prologue (gdbarch, pc, limit_pc, NULL); |
29d73ae4 | 1448 | |
a89fea3c | 1449 | for (skip_pc = pc; skip_pc < limit_pc; skip_pc += 4) |
f43845b3 | 1450 | { |
e17a4113 | 1451 | inst = read_memory_unsigned_integer (skip_pc, 4, byte_order_for_code); |
9d4fde75 | 1452 | |
b8d5e71d MS |
1453 | /* "mov ip, sp" is no longer a required part of the prologue. */ |
1454 | if (inst == 0xe1a0c00d) /* mov ip, sp */ | |
1455 | continue; | |
c906108c | 1456 | |
28cd8767 JG |
1457 | if ((inst & 0xfffff000) == 0xe28dc000) /* add ip, sp #n */ |
1458 | continue; | |
1459 | ||
1460 | if ((inst & 0xfffff000) == 0xe24dc000) /* sub ip, sp #n */ | |
1461 | continue; | |
1462 | ||
b8d5e71d MS |
1463 | /* Some prologues begin with "str lr, [sp, #-4]!". */ |
1464 | if (inst == 0xe52de004) /* str lr, [sp, #-4]! */ | |
1465 | continue; | |
c906108c | 1466 | |
b8d5e71d MS |
1467 | if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */ |
1468 | continue; | |
c906108c | 1469 | |
b8d5e71d MS |
1470 | if ((inst & 0xfffff800) == 0xe92dd800) /* stmfd sp!,{fp,ip,lr,pc} */ |
1471 | continue; | |
11d3b27d | 1472 | |
b8d5e71d MS |
1473 | /* Any insns after this point may float into the code, if it makes |
1474 | for better instruction scheduling, so we skip them only if we | |
1475 | find them, but still consider the function to be frame-ful. */ | |
f43845b3 | 1476 | |
b8d5e71d MS |
1477 | /* We may have either one sfmfd instruction here, or several stfe |
1478 | insns, depending on the version of floating point code we | |
1479 | support. */ | |
1480 | if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */ | |
1481 | continue; | |
1482 | ||
1483 | if ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */ | |
1484 | continue; | |
1485 | ||
1486 | if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */ | |
1487 | continue; | |
1488 | ||
1489 | if ((inst & 0xfffff000) == 0xe24dd000) /* sub sp, sp, #nn */ | |
1490 | continue; | |
1491 | ||
f8bf5763 PM |
1492 | if ((inst & 0xffffc000) == 0xe54b0000 /* strb r(0123),[r11,#-nn] */ |
1493 | || (inst & 0xffffc0f0) == 0xe14b00b0 /* strh r(0123),[r11,#-nn] */ | |
1494 | || (inst & 0xffffc000) == 0xe50b0000) /* str r(0123),[r11,#-nn] */ | |
b8d5e71d MS |
1495 | continue; |
1496 | ||
f8bf5763 PM |
1497 | if ((inst & 0xffffc000) == 0xe5cd0000 /* strb r(0123),[sp,#nn] */ |
1498 | || (inst & 0xffffc0f0) == 0xe1cd00b0 /* strh r(0123),[sp,#nn] */ | |
1499 | || (inst & 0xffffc000) == 0xe58d0000) /* str r(0123),[sp,#nn] */ | |
b8d5e71d MS |
1500 | continue; |
1501 | ||
1502 | /* Un-recognized instruction; stop scanning. */ | |
1503 | break; | |
f43845b3 | 1504 | } |
c906108c | 1505 | |
0963b4bd | 1506 | return skip_pc; /* End of prologue. */ |
c906108c | 1507 | } |
94c30b78 | 1508 | |
c5aa993b | 1509 | /* *INDENT-OFF* */ |
c906108c SS |
1510 | /* Function: thumb_scan_prologue (helper function for arm_scan_prologue) |
1511 | This function decodes a Thumb function prologue to determine: | |
1512 | 1) the size of the stack frame | |
1513 | 2) which registers are saved on it | |
1514 | 3) the offsets of saved regs | |
1515 | 4) the offset from the stack pointer to the frame pointer | |
c906108c | 1516 | |
da59e081 JM |
1517 | A typical Thumb function prologue would create this stack frame |
1518 | (offsets relative to FP) | |
c906108c SS |
1519 | old SP -> 24 stack parameters |
1520 | 20 LR | |
1521 | 16 R7 | |
1522 | R7 -> 0 local variables (16 bytes) | |
1523 | SP -> -12 additional stack space (12 bytes) | |
1524 | The frame size would thus be 36 bytes, and the frame offset would be | |
0963b4bd | 1525 | 12 bytes. The frame register is R7. |
da59e081 | 1526 | |
da3c6d4a MS |
1527 | The comments for thumb_skip_prolog() describe the algorithm we use |
1528 | to detect the end of the prolog. */ | |
c5aa993b JM |
1529 | /* *INDENT-ON* */ |
1530 | ||
c906108c | 1531 | static void |
be8626e0 | 1532 | thumb_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR prev_pc, |
b39cc962 | 1533 | CORE_ADDR block_addr, struct arm_prologue_cache *cache) |
c906108c SS |
1534 | { |
1535 | CORE_ADDR prologue_start; | |
1536 | CORE_ADDR prologue_end; | |
c906108c | 1537 | |
b39cc962 DJ |
1538 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, |
1539 | &prologue_end)) | |
c906108c | 1540 | { |
ec3d575a UW |
1541 | /* See comment in arm_scan_prologue for an explanation of |
1542 | this heuristics. */ | |
1543 | if (prologue_end > prologue_start + 64) | |
1544 | { | |
1545 | prologue_end = prologue_start + 64; | |
1546 | } | |
c906108c SS |
1547 | } |
1548 | else | |
f7060f85 DJ |
1549 | /* We're in the boondocks: we have no idea where the start of the |
1550 | function is. */ | |
1551 | return; | |
c906108c | 1552 | |
eb5492fa | 1553 | prologue_end = min (prologue_end, prev_pc); |
c906108c | 1554 | |
be8626e0 | 1555 | thumb_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); |
c906108c SS |
1556 | } |
1557 | ||
0d39a070 | 1558 | /* Return 1 if THIS_INSTR might change control flow, 0 otherwise. */ |
c906108c | 1559 | |
0d39a070 DJ |
1560 | static int |
1561 | arm_instruction_changes_pc (uint32_t this_instr) | |
c906108c | 1562 | { |
0d39a070 DJ |
1563 | if (bits (this_instr, 28, 31) == INST_NV) |
1564 | /* Unconditional instructions. */ | |
1565 | switch (bits (this_instr, 24, 27)) | |
1566 | { | |
1567 | case 0xa: | |
1568 | case 0xb: | |
1569 | /* Branch with Link and change to Thumb. */ | |
1570 | return 1; | |
1571 | case 0xc: | |
1572 | case 0xd: | |
1573 | case 0xe: | |
1574 | /* Coprocessor register transfer. */ | |
1575 | if (bits (this_instr, 12, 15) == 15) | |
1576 | error (_("Invalid update to pc in instruction")); | |
1577 | return 0; | |
1578 | default: | |
1579 | return 0; | |
1580 | } | |
1581 | else | |
1582 | switch (bits (this_instr, 25, 27)) | |
1583 | { | |
1584 | case 0x0: | |
1585 | if (bits (this_instr, 23, 24) == 2 && bit (this_instr, 20) == 0) | |
1586 | { | |
1587 | /* Multiplies and extra load/stores. */ | |
1588 | if (bit (this_instr, 4) == 1 && bit (this_instr, 7) == 1) | |
1589 | /* Neither multiplies nor extension load/stores are allowed | |
1590 | to modify PC. */ | |
1591 | return 0; | |
1592 | ||
1593 | /* Otherwise, miscellaneous instructions. */ | |
1594 | ||
1595 | /* BX <reg>, BXJ <reg>, BLX <reg> */ | |
1596 | if (bits (this_instr, 4, 27) == 0x12fff1 | |
1597 | || bits (this_instr, 4, 27) == 0x12fff2 | |
1598 | || bits (this_instr, 4, 27) == 0x12fff3) | |
1599 | return 1; | |
1600 | ||
1601 | /* Other miscellaneous instructions are unpredictable if they | |
1602 | modify PC. */ | |
1603 | return 0; | |
1604 | } | |
1605 | /* Data processing instruction. Fall through. */ | |
c906108c | 1606 | |
0d39a070 DJ |
1607 | case 0x1: |
1608 | if (bits (this_instr, 12, 15) == 15) | |
1609 | return 1; | |
1610 | else | |
1611 | return 0; | |
c906108c | 1612 | |
0d39a070 DJ |
1613 | case 0x2: |
1614 | case 0x3: | |
1615 | /* Media instructions and architecturally undefined instructions. */ | |
1616 | if (bits (this_instr, 25, 27) == 3 && bit (this_instr, 4) == 1) | |
1617 | return 0; | |
c906108c | 1618 | |
0d39a070 DJ |
1619 | /* Stores. */ |
1620 | if (bit (this_instr, 20) == 0) | |
1621 | return 0; | |
2a451106 | 1622 | |
0d39a070 DJ |
1623 | /* Loads. */ |
1624 | if (bits (this_instr, 12, 15) == ARM_PC_REGNUM) | |
1625 | return 1; | |
1626 | else | |
1627 | return 0; | |
2a451106 | 1628 | |
0d39a070 DJ |
1629 | case 0x4: |
1630 | /* Load/store multiple. */ | |
1631 | if (bit (this_instr, 20) == 1 && bit (this_instr, 15) == 1) | |
1632 | return 1; | |
1633 | else | |
1634 | return 0; | |
2a451106 | 1635 | |
0d39a070 DJ |
1636 | case 0x5: |
1637 | /* Branch and branch with link. */ | |
1638 | return 1; | |
2a451106 | 1639 | |
0d39a070 DJ |
1640 | case 0x6: |
1641 | case 0x7: | |
1642 | /* Coprocessor transfers or SWIs can not affect PC. */ | |
1643 | return 0; | |
eb5492fa | 1644 | |
0d39a070 | 1645 | default: |
9b20d036 | 1646 | internal_error (__FILE__, __LINE__, _("bad value in switch")); |
0d39a070 DJ |
1647 | } |
1648 | } | |
c906108c | 1649 | |
0d39a070 DJ |
1650 | /* Analyze an ARM mode prologue starting at PROLOGUE_START and |
1651 | continuing no further than PROLOGUE_END. If CACHE is non-NULL, | |
1652 | fill it in. Return the first address not recognized as a prologue | |
1653 | instruction. | |
eb5492fa | 1654 | |
0d39a070 DJ |
1655 | We recognize all the instructions typically found in ARM prologues, |
1656 | plus harmless instructions which can be skipped (either for analysis | |
1657 | purposes, or a more restrictive set that can be skipped when finding | |
1658 | the end of the prologue). */ | |
1659 | ||
1660 | static CORE_ADDR | |
1661 | arm_analyze_prologue (struct gdbarch *gdbarch, | |
1662 | CORE_ADDR prologue_start, CORE_ADDR prologue_end, | |
1663 | struct arm_prologue_cache *cache) | |
1664 | { | |
1665 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1666 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1667 | int regno; | |
1668 | CORE_ADDR offset, current_pc; | |
1669 | pv_t regs[ARM_FPS_REGNUM]; | |
1670 | struct pv_area *stack; | |
1671 | struct cleanup *back_to; | |
1672 | int framereg, framesize; | |
1673 | CORE_ADDR unrecognized_pc = 0; | |
1674 | ||
1675 | /* Search the prologue looking for instructions that set up the | |
96baa820 | 1676 | frame pointer, adjust the stack pointer, and save registers. |
ed9a39eb | 1677 | |
96baa820 JM |
1678 | Be careful, however, and if it doesn't look like a prologue, |
1679 | don't try to scan it. If, for instance, a frameless function | |
1680 | begins with stmfd sp!, then we will tell ourselves there is | |
b8d5e71d | 1681 | a frame, which will confuse stack traceback, as well as "finish" |
96baa820 | 1682 | and other operations that rely on a knowledge of the stack |
0d39a070 | 1683 | traceback. */ |
d4473757 | 1684 | |
4be43953 DJ |
1685 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) |
1686 | regs[regno] = pv_register (regno, 0); | |
55f960e1 | 1687 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
4be43953 DJ |
1688 | back_to = make_cleanup_free_pv_area (stack); |
1689 | ||
94c30b78 MS |
1690 | for (current_pc = prologue_start; |
1691 | current_pc < prologue_end; | |
f43845b3 | 1692 | current_pc += 4) |
96baa820 | 1693 | { |
e17a4113 UW |
1694 | unsigned int insn |
1695 | = read_memory_unsigned_integer (current_pc, 4, byte_order_for_code); | |
9d4fde75 | 1696 | |
94c30b78 | 1697 | if (insn == 0xe1a0c00d) /* mov ip, sp */ |
f43845b3 | 1698 | { |
4be43953 | 1699 | regs[ARM_IP_REGNUM] = regs[ARM_SP_REGNUM]; |
28cd8767 JG |
1700 | continue; |
1701 | } | |
0d39a070 DJ |
1702 | else if ((insn & 0xfff00000) == 0xe2800000 /* add Rd, Rn, #n */ |
1703 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
28cd8767 JG |
1704 | { |
1705 | unsigned imm = insn & 0xff; /* immediate value */ | |
1706 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
0d39a070 | 1707 | int rd = bits (insn, 12, 15); |
28cd8767 | 1708 | imm = (imm >> rot) | (imm << (32 - rot)); |
0d39a070 | 1709 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], imm); |
28cd8767 JG |
1710 | continue; |
1711 | } | |
0d39a070 DJ |
1712 | else if ((insn & 0xfff00000) == 0xe2400000 /* sub Rd, Rn, #n */ |
1713 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
28cd8767 JG |
1714 | { |
1715 | unsigned imm = insn & 0xff; /* immediate value */ | |
1716 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
0d39a070 | 1717 | int rd = bits (insn, 12, 15); |
28cd8767 | 1718 | imm = (imm >> rot) | (imm << (32 - rot)); |
0d39a070 | 1719 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], -imm); |
f43845b3 MS |
1720 | continue; |
1721 | } | |
0963b4bd MS |
1722 | else if ((insn & 0xffff0fff) == 0xe52d0004) /* str Rd, |
1723 | [sp, #-4]! */ | |
f43845b3 | 1724 | { |
4be43953 DJ |
1725 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1726 | break; | |
1727 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -4); | |
0d39a070 DJ |
1728 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, |
1729 | regs[bits (insn, 12, 15)]); | |
f43845b3 MS |
1730 | continue; |
1731 | } | |
1732 | else if ((insn & 0xffff0000) == 0xe92d0000) | |
d4473757 KB |
1733 | /* stmfd sp!, {..., fp, ip, lr, pc} |
1734 | or | |
1735 | stmfd sp!, {a1, a2, a3, a4} */ | |
c906108c | 1736 | { |
d4473757 | 1737 | int mask = insn & 0xffff; |
ed9a39eb | 1738 | |
4be43953 DJ |
1739 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1740 | break; | |
1741 | ||
94c30b78 | 1742 | /* Calculate offsets of saved registers. */ |
34e8f22d | 1743 | for (regno = ARM_PC_REGNUM; regno >= 0; regno--) |
d4473757 KB |
1744 | if (mask & (1 << regno)) |
1745 | { | |
0963b4bd MS |
1746 | regs[ARM_SP_REGNUM] |
1747 | = pv_add_constant (regs[ARM_SP_REGNUM], -4); | |
4be43953 | 1748 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); |
d4473757 KB |
1749 | } |
1750 | } | |
0d39a070 DJ |
1751 | else if ((insn & 0xffff0000) == 0xe54b0000 /* strb rx,[r11,#-n] */ |
1752 | || (insn & 0xffff00f0) == 0xe14b00b0 /* strh rx,[r11,#-n] */ | |
f8bf5763 | 1753 | || (insn & 0xffffc000) == 0xe50b0000) /* str rx,[r11,#-n] */ |
b8d5e71d MS |
1754 | { |
1755 | /* No need to add this to saved_regs -- it's just an arg reg. */ | |
1756 | continue; | |
1757 | } | |
0d39a070 DJ |
1758 | else if ((insn & 0xffff0000) == 0xe5cd0000 /* strb rx,[sp,#n] */ |
1759 | || (insn & 0xffff00f0) == 0xe1cd00b0 /* strh rx,[sp,#n] */ | |
f8bf5763 | 1760 | || (insn & 0xffffc000) == 0xe58d0000) /* str rx,[sp,#n] */ |
f43845b3 MS |
1761 | { |
1762 | /* No need to add this to saved_regs -- it's just an arg reg. */ | |
1763 | continue; | |
1764 | } | |
0963b4bd MS |
1765 | else if ((insn & 0xfff00000) == 0xe8800000 /* stm Rn, |
1766 | { registers } */ | |
0d39a070 DJ |
1767 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
1768 | { | |
1769 | /* No need to add this to saved_regs -- it's just arg regs. */ | |
1770 | continue; | |
1771 | } | |
d4473757 KB |
1772 | else if ((insn & 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */ |
1773 | { | |
94c30b78 MS |
1774 | unsigned imm = insn & 0xff; /* immediate value */ |
1775 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
d4473757 | 1776 | imm = (imm >> rot) | (imm << (32 - rot)); |
4be43953 | 1777 | regs[ARM_FP_REGNUM] = pv_add_constant (regs[ARM_IP_REGNUM], -imm); |
d4473757 KB |
1778 | } |
1779 | else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */ | |
1780 | { | |
94c30b78 MS |
1781 | unsigned imm = insn & 0xff; /* immediate value */ |
1782 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
d4473757 | 1783 | imm = (imm >> rot) | (imm << (32 - rot)); |
4be43953 | 1784 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -imm); |
d4473757 | 1785 | } |
0963b4bd MS |
1786 | else if ((insn & 0xffff7fff) == 0xed6d0103 /* stfe f?, |
1787 | [sp, -#c]! */ | |
2af46ca0 | 1788 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
d4473757 | 1789 | { |
4be43953 DJ |
1790 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1791 | break; | |
1792 | ||
1793 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); | |
34e8f22d | 1794 | regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07); |
4be43953 | 1795 | pv_area_store (stack, regs[ARM_SP_REGNUM], 12, regs[regno]); |
d4473757 | 1796 | } |
0963b4bd MS |
1797 | else if ((insn & 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4, |
1798 | [sp!] */ | |
2af46ca0 | 1799 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
d4473757 KB |
1800 | { |
1801 | int n_saved_fp_regs; | |
1802 | unsigned int fp_start_reg, fp_bound_reg; | |
1803 | ||
4be43953 DJ |
1804 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1805 | break; | |
1806 | ||
94c30b78 | 1807 | if ((insn & 0x800) == 0x800) /* N0 is set */ |
96baa820 | 1808 | { |
d4473757 KB |
1809 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
1810 | n_saved_fp_regs = 3; | |
1811 | else | |
1812 | n_saved_fp_regs = 1; | |
96baa820 | 1813 | } |
d4473757 | 1814 | else |
96baa820 | 1815 | { |
d4473757 KB |
1816 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
1817 | n_saved_fp_regs = 2; | |
1818 | else | |
1819 | n_saved_fp_regs = 4; | |
96baa820 | 1820 | } |
d4473757 | 1821 | |
34e8f22d | 1822 | fp_start_reg = ARM_F0_REGNUM + ((insn >> 12) & 0x7); |
d4473757 KB |
1823 | fp_bound_reg = fp_start_reg + n_saved_fp_regs; |
1824 | for (; fp_start_reg < fp_bound_reg; fp_start_reg++) | |
96baa820 | 1825 | { |
4be43953 DJ |
1826 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); |
1827 | pv_area_store (stack, regs[ARM_SP_REGNUM], 12, | |
1828 | regs[fp_start_reg++]); | |
96baa820 | 1829 | } |
c906108c | 1830 | } |
0d39a070 DJ |
1831 | else if ((insn & 0xff000000) == 0xeb000000 && cache == NULL) /* bl */ |
1832 | { | |
1833 | /* Allow some special function calls when skipping the | |
1834 | prologue; GCC generates these before storing arguments to | |
1835 | the stack. */ | |
1836 | CORE_ADDR dest = BranchDest (current_pc, insn); | |
1837 | ||
e0634ccf | 1838 | if (skip_prologue_function (gdbarch, dest, 0)) |
0d39a070 DJ |
1839 | continue; |
1840 | else | |
1841 | break; | |
1842 | } | |
d4473757 | 1843 | else if ((insn & 0xf0000000) != 0xe0000000) |
0963b4bd | 1844 | break; /* Condition not true, exit early. */ |
0d39a070 DJ |
1845 | else if (arm_instruction_changes_pc (insn)) |
1846 | /* Don't scan past anything that might change control flow. */ | |
1847 | break; | |
d19f7eee UW |
1848 | else if ((insn & 0xfe500000) == 0xe8100000 /* ldm */ |
1849 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
1850 | /* Ignore block loads from the stack, potentially copying | |
1851 | parameters from memory. */ | |
1852 | continue; | |
1853 | else if ((insn & 0xfc500000) == 0xe4100000 | |
1854 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
1855 | /* Similarly ignore single loads from the stack. */ | |
1856 | continue; | |
0d39a070 DJ |
1857 | else if ((insn & 0xffff0ff0) == 0xe1a00000) |
1858 | /* MOV Rd, Rm. Skip register copies, i.e. saves to another | |
1859 | register instead of the stack. */ | |
d4473757 | 1860 | continue; |
0d39a070 DJ |
1861 | else |
1862 | { | |
1863 | /* The optimizer might shove anything into the prologue, | |
1864 | so we just skip what we don't recognize. */ | |
1865 | unrecognized_pc = current_pc; | |
1866 | continue; | |
1867 | } | |
c906108c SS |
1868 | } |
1869 | ||
0d39a070 DJ |
1870 | if (unrecognized_pc == 0) |
1871 | unrecognized_pc = current_pc; | |
1872 | ||
4be43953 DJ |
1873 | /* The frame size is just the distance from the frame register |
1874 | to the original stack pointer. */ | |
1875 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) | |
1876 | { | |
1877 | /* Frame pointer is fp. */ | |
0d39a070 DJ |
1878 | framereg = ARM_FP_REGNUM; |
1879 | framesize = -regs[ARM_FP_REGNUM].k; | |
4be43953 | 1880 | } |
72a2e3dc | 1881 | else |
4be43953 DJ |
1882 | { |
1883 | /* Try the stack pointer... this is a bit desperate. */ | |
0d39a070 DJ |
1884 | framereg = ARM_SP_REGNUM; |
1885 | framesize = -regs[ARM_SP_REGNUM].k; | |
4be43953 | 1886 | } |
4be43953 | 1887 | |
0d39a070 DJ |
1888 | if (cache) |
1889 | { | |
1890 | cache->framereg = framereg; | |
1891 | cache->framesize = framesize; | |
1892 | ||
1893 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) | |
1894 | if (pv_area_find_reg (stack, gdbarch, regno, &offset)) | |
1895 | cache->saved_regs[regno].addr = offset; | |
1896 | } | |
1897 | ||
1898 | if (arm_debug) | |
1899 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1900 | paddress (gdbarch, unrecognized_pc)); | |
4be43953 DJ |
1901 | |
1902 | do_cleanups (back_to); | |
0d39a070 DJ |
1903 | return unrecognized_pc; |
1904 | } | |
1905 | ||
1906 | static void | |
1907 | arm_scan_prologue (struct frame_info *this_frame, | |
1908 | struct arm_prologue_cache *cache) | |
1909 | { | |
1910 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1911 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1912 | int regno; | |
1913 | CORE_ADDR prologue_start, prologue_end, current_pc; | |
1914 | CORE_ADDR prev_pc = get_frame_pc (this_frame); | |
1915 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
1916 | pv_t regs[ARM_FPS_REGNUM]; | |
1917 | struct pv_area *stack; | |
1918 | struct cleanup *back_to; | |
1919 | CORE_ADDR offset; | |
1920 | ||
1921 | /* Assume there is no frame until proven otherwise. */ | |
1922 | cache->framereg = ARM_SP_REGNUM; | |
1923 | cache->framesize = 0; | |
1924 | ||
1925 | /* Check for Thumb prologue. */ | |
1926 | if (arm_frame_is_thumb (this_frame)) | |
1927 | { | |
1928 | thumb_scan_prologue (gdbarch, prev_pc, block_addr, cache); | |
1929 | return; | |
1930 | } | |
1931 | ||
1932 | /* Find the function prologue. If we can't find the function in | |
1933 | the symbol table, peek in the stack frame to find the PC. */ | |
1934 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, | |
1935 | &prologue_end)) | |
1936 | { | |
1937 | /* One way to find the end of the prologue (which works well | |
1938 | for unoptimized code) is to do the following: | |
1939 | ||
1940 | struct symtab_and_line sal = find_pc_line (prologue_start, 0); | |
1941 | ||
1942 | if (sal.line == 0) | |
1943 | prologue_end = prev_pc; | |
1944 | else if (sal.end < prologue_end) | |
1945 | prologue_end = sal.end; | |
1946 | ||
1947 | This mechanism is very accurate so long as the optimizer | |
1948 | doesn't move any instructions from the function body into the | |
1949 | prologue. If this happens, sal.end will be the last | |
1950 | instruction in the first hunk of prologue code just before | |
1951 | the first instruction that the scheduler has moved from | |
1952 | the body to the prologue. | |
1953 | ||
1954 | In order to make sure that we scan all of the prologue | |
1955 | instructions, we use a slightly less accurate mechanism which | |
1956 | may scan more than necessary. To help compensate for this | |
1957 | lack of accuracy, the prologue scanning loop below contains | |
1958 | several clauses which'll cause the loop to terminate early if | |
1959 | an implausible prologue instruction is encountered. | |
1960 | ||
1961 | The expression | |
1962 | ||
1963 | prologue_start + 64 | |
1964 | ||
1965 | is a suitable endpoint since it accounts for the largest | |
1966 | possible prologue plus up to five instructions inserted by | |
1967 | the scheduler. */ | |
1968 | ||
1969 | if (prologue_end > prologue_start + 64) | |
1970 | { | |
1971 | prologue_end = prologue_start + 64; /* See above. */ | |
1972 | } | |
1973 | } | |
1974 | else | |
1975 | { | |
1976 | /* We have no symbol information. Our only option is to assume this | |
1977 | function has a standard stack frame and the normal frame register. | |
1978 | Then, we can find the value of our frame pointer on entrance to | |
1979 | the callee (or at the present moment if this is the innermost frame). | |
1980 | The value stored there should be the address of the stmfd + 8. */ | |
1981 | CORE_ADDR frame_loc; | |
1982 | LONGEST return_value; | |
1983 | ||
1984 | frame_loc = get_frame_register_unsigned (this_frame, ARM_FP_REGNUM); | |
1985 | if (!safe_read_memory_integer (frame_loc, 4, byte_order, &return_value)) | |
1986 | return; | |
1987 | else | |
1988 | { | |
1989 | prologue_start = gdbarch_addr_bits_remove | |
1990 | (gdbarch, return_value) - 8; | |
1991 | prologue_end = prologue_start + 64; /* See above. */ | |
1992 | } | |
1993 | } | |
1994 | ||
1995 | if (prev_pc < prologue_end) | |
1996 | prologue_end = prev_pc; | |
1997 | ||
1998 | arm_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); | |
c906108c SS |
1999 | } |
2000 | ||
eb5492fa | 2001 | static struct arm_prologue_cache * |
a262aec2 | 2002 | arm_make_prologue_cache (struct frame_info *this_frame) |
c906108c | 2003 | { |
eb5492fa DJ |
2004 | int reg; |
2005 | struct arm_prologue_cache *cache; | |
2006 | CORE_ADDR unwound_fp; | |
c5aa993b | 2007 | |
35d5d4ee | 2008 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2009 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
c906108c | 2010 | |
a262aec2 | 2011 | arm_scan_prologue (this_frame, cache); |
848cfffb | 2012 | |
a262aec2 | 2013 | unwound_fp = get_frame_register_unsigned (this_frame, cache->framereg); |
eb5492fa DJ |
2014 | if (unwound_fp == 0) |
2015 | return cache; | |
c906108c | 2016 | |
4be43953 | 2017 | cache->prev_sp = unwound_fp + cache->framesize; |
c906108c | 2018 | |
eb5492fa DJ |
2019 | /* Calculate actual addresses of saved registers using offsets |
2020 | determined by arm_scan_prologue. */ | |
a262aec2 | 2021 | for (reg = 0; reg < gdbarch_num_regs (get_frame_arch (this_frame)); reg++) |
e28a332c | 2022 | if (trad_frame_addr_p (cache->saved_regs, reg)) |
eb5492fa DJ |
2023 | cache->saved_regs[reg].addr += cache->prev_sp; |
2024 | ||
2025 | return cache; | |
c906108c SS |
2026 | } |
2027 | ||
eb5492fa DJ |
2028 | /* Our frame ID for a normal frame is the current function's starting PC |
2029 | and the caller's SP when we were called. */ | |
c906108c | 2030 | |
148754e5 | 2031 | static void |
a262aec2 | 2032 | arm_prologue_this_id (struct frame_info *this_frame, |
eb5492fa DJ |
2033 | void **this_cache, |
2034 | struct frame_id *this_id) | |
c906108c | 2035 | { |
eb5492fa DJ |
2036 | struct arm_prologue_cache *cache; |
2037 | struct frame_id id; | |
2c404490 | 2038 | CORE_ADDR pc, func; |
f079148d | 2039 | |
eb5492fa | 2040 | if (*this_cache == NULL) |
a262aec2 | 2041 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa | 2042 | cache = *this_cache; |
2a451106 | 2043 | |
2c404490 DJ |
2044 | /* This is meant to halt the backtrace at "_start". */ |
2045 | pc = get_frame_pc (this_frame); | |
2046 | if (pc <= gdbarch_tdep (get_frame_arch (this_frame))->lowest_pc) | |
eb5492fa | 2047 | return; |
5a203e44 | 2048 | |
eb5492fa DJ |
2049 | /* If we've hit a wall, stop. */ |
2050 | if (cache->prev_sp == 0) | |
2051 | return; | |
24de872b | 2052 | |
0e9e9abd UW |
2053 | /* Use function start address as part of the frame ID. If we cannot |
2054 | identify the start address (due to missing symbol information), | |
2055 | fall back to just using the current PC. */ | |
2c404490 | 2056 | func = get_frame_func (this_frame); |
0e9e9abd UW |
2057 | if (!func) |
2058 | func = pc; | |
2059 | ||
eb5492fa | 2060 | id = frame_id_build (cache->prev_sp, func); |
eb5492fa | 2061 | *this_id = id; |
c906108c SS |
2062 | } |
2063 | ||
a262aec2 DJ |
2064 | static struct value * |
2065 | arm_prologue_prev_register (struct frame_info *this_frame, | |
eb5492fa | 2066 | void **this_cache, |
a262aec2 | 2067 | int prev_regnum) |
24de872b | 2068 | { |
24568a2c | 2069 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
24de872b DJ |
2070 | struct arm_prologue_cache *cache; |
2071 | ||
eb5492fa | 2072 | if (*this_cache == NULL) |
a262aec2 | 2073 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa | 2074 | cache = *this_cache; |
24de872b | 2075 | |
eb5492fa | 2076 | /* If we are asked to unwind the PC, then we need to return the LR |
b39cc962 DJ |
2077 | instead. The prologue may save PC, but it will point into this |
2078 | frame's prologue, not the next frame's resume location. Also | |
2079 | strip the saved T bit. A valid LR may have the low bit set, but | |
2080 | a valid PC never does. */ | |
eb5492fa | 2081 | if (prev_regnum == ARM_PC_REGNUM) |
b39cc962 DJ |
2082 | { |
2083 | CORE_ADDR lr; | |
2084 | ||
2085 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2086 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
24568a2c | 2087 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 | 2088 | } |
24de872b | 2089 | |
eb5492fa | 2090 | /* SP is generally not saved to the stack, but this frame is |
a262aec2 | 2091 | identified by the next frame's stack pointer at the time of the call. |
eb5492fa DJ |
2092 | The value was already reconstructed into PREV_SP. */ |
2093 | if (prev_regnum == ARM_SP_REGNUM) | |
a262aec2 | 2094 | return frame_unwind_got_constant (this_frame, prev_regnum, cache->prev_sp); |
eb5492fa | 2095 | |
b39cc962 DJ |
2096 | /* The CPSR may have been changed by the call instruction and by the |
2097 | called function. The only bit we can reconstruct is the T bit, | |
2098 | by checking the low bit of LR as of the call. This is a reliable | |
2099 | indicator of Thumb-ness except for some ARM v4T pre-interworking | |
2100 | Thumb code, which could get away with a clear low bit as long as | |
2101 | the called function did not use bx. Guess that all other | |
2102 | bits are unchanged; the condition flags are presumably lost, | |
2103 | but the processor status is likely valid. */ | |
2104 | if (prev_regnum == ARM_PS_REGNUM) | |
2105 | { | |
2106 | CORE_ADDR lr, cpsr; | |
9779414d | 2107 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
2108 | |
2109 | cpsr = get_frame_register_unsigned (this_frame, prev_regnum); | |
2110 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2111 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 2112 | cpsr |= t_bit; |
b39cc962 | 2113 | else |
9779414d | 2114 | cpsr &= ~t_bit; |
b39cc962 DJ |
2115 | return frame_unwind_got_constant (this_frame, prev_regnum, cpsr); |
2116 | } | |
2117 | ||
a262aec2 DJ |
2118 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, |
2119 | prev_regnum); | |
eb5492fa DJ |
2120 | } |
2121 | ||
2122 | struct frame_unwind arm_prologue_unwind = { | |
2123 | NORMAL_FRAME, | |
8fbca658 | 2124 | default_frame_unwind_stop_reason, |
eb5492fa | 2125 | arm_prologue_this_id, |
a262aec2 DJ |
2126 | arm_prologue_prev_register, |
2127 | NULL, | |
2128 | default_frame_sniffer | |
eb5492fa DJ |
2129 | }; |
2130 | ||
0e9e9abd UW |
2131 | /* Maintain a list of ARM exception table entries per objfile, similar to the |
2132 | list of mapping symbols. We only cache entries for standard ARM-defined | |
2133 | personality routines; the cache will contain only the frame unwinding | |
2134 | instructions associated with the entry (not the descriptors). */ | |
2135 | ||
2136 | static const struct objfile_data *arm_exidx_data_key; | |
2137 | ||
2138 | struct arm_exidx_entry | |
2139 | { | |
2140 | bfd_vma addr; | |
2141 | gdb_byte *entry; | |
2142 | }; | |
2143 | typedef struct arm_exidx_entry arm_exidx_entry_s; | |
2144 | DEF_VEC_O(arm_exidx_entry_s); | |
2145 | ||
2146 | struct arm_exidx_data | |
2147 | { | |
2148 | VEC(arm_exidx_entry_s) **section_maps; | |
2149 | }; | |
2150 | ||
2151 | static void | |
2152 | arm_exidx_data_free (struct objfile *objfile, void *arg) | |
2153 | { | |
2154 | struct arm_exidx_data *data = arg; | |
2155 | unsigned int i; | |
2156 | ||
2157 | for (i = 0; i < objfile->obfd->section_count; i++) | |
2158 | VEC_free (arm_exidx_entry_s, data->section_maps[i]); | |
2159 | } | |
2160 | ||
2161 | static inline int | |
2162 | arm_compare_exidx_entries (const struct arm_exidx_entry *lhs, | |
2163 | const struct arm_exidx_entry *rhs) | |
2164 | { | |
2165 | return lhs->addr < rhs->addr; | |
2166 | } | |
2167 | ||
2168 | static struct obj_section * | |
2169 | arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma) | |
2170 | { | |
2171 | struct obj_section *osect; | |
2172 | ||
2173 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
2174 | if (bfd_get_section_flags (objfile->obfd, | |
2175 | osect->the_bfd_section) & SEC_ALLOC) | |
2176 | { | |
2177 | bfd_vma start, size; | |
2178 | start = bfd_get_section_vma (objfile->obfd, osect->the_bfd_section); | |
2179 | size = bfd_get_section_size (osect->the_bfd_section); | |
2180 | ||
2181 | if (start <= vma && vma < start + size) | |
2182 | return osect; | |
2183 | } | |
2184 | ||
2185 | return NULL; | |
2186 | } | |
2187 | ||
2188 | /* Parse contents of exception table and exception index sections | |
2189 | of OBJFILE, and fill in the exception table entry cache. | |
2190 | ||
2191 | For each entry that refers to a standard ARM-defined personality | |
2192 | routine, extract the frame unwinding instructions (from either | |
2193 | the index or the table section). The unwinding instructions | |
2194 | are normalized by: | |
2195 | - extracting them from the rest of the table data | |
2196 | - converting to host endianness | |
2197 | - appending the implicit 0xb0 ("Finish") code | |
2198 | ||
2199 | The extracted and normalized instructions are stored for later | |
2200 | retrieval by the arm_find_exidx_entry routine. */ | |
2201 | ||
2202 | static void | |
2203 | arm_exidx_new_objfile (struct objfile *objfile) | |
2204 | { | |
3bb47e8b | 2205 | struct cleanup *cleanups; |
0e9e9abd UW |
2206 | struct arm_exidx_data *data; |
2207 | asection *exidx, *extab; | |
2208 | bfd_vma exidx_vma = 0, extab_vma = 0; | |
2209 | bfd_size_type exidx_size = 0, extab_size = 0; | |
2210 | gdb_byte *exidx_data = NULL, *extab_data = NULL; | |
2211 | LONGEST i; | |
2212 | ||
2213 | /* If we've already touched this file, do nothing. */ | |
2214 | if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL) | |
2215 | return; | |
3bb47e8b | 2216 | cleanups = make_cleanup (null_cleanup, NULL); |
0e9e9abd UW |
2217 | |
2218 | /* Read contents of exception table and index. */ | |
2219 | exidx = bfd_get_section_by_name (objfile->obfd, ".ARM.exidx"); | |
2220 | if (exidx) | |
2221 | { | |
2222 | exidx_vma = bfd_section_vma (objfile->obfd, exidx); | |
2223 | exidx_size = bfd_get_section_size (exidx); | |
2224 | exidx_data = xmalloc (exidx_size); | |
2225 | make_cleanup (xfree, exidx_data); | |
2226 | ||
2227 | if (!bfd_get_section_contents (objfile->obfd, exidx, | |
2228 | exidx_data, 0, exidx_size)) | |
2229 | { | |
2230 | do_cleanups (cleanups); | |
2231 | return; | |
2232 | } | |
2233 | } | |
2234 | ||
2235 | extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab"); | |
2236 | if (extab) | |
2237 | { | |
2238 | extab_vma = bfd_section_vma (objfile->obfd, extab); | |
2239 | extab_size = bfd_get_section_size (extab); | |
2240 | extab_data = xmalloc (extab_size); | |
2241 | make_cleanup (xfree, extab_data); | |
2242 | ||
2243 | if (!bfd_get_section_contents (objfile->obfd, extab, | |
2244 | extab_data, 0, extab_size)) | |
2245 | { | |
2246 | do_cleanups (cleanups); | |
2247 | return; | |
2248 | } | |
2249 | } | |
2250 | ||
2251 | /* Allocate exception table data structure. */ | |
2252 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct arm_exidx_data); | |
2253 | set_objfile_data (objfile, arm_exidx_data_key, data); | |
2254 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, | |
2255 | objfile->obfd->section_count, | |
2256 | VEC(arm_exidx_entry_s) *); | |
2257 | ||
2258 | /* Fill in exception table. */ | |
2259 | for (i = 0; i < exidx_size / 8; i++) | |
2260 | { | |
2261 | struct arm_exidx_entry new_exidx_entry; | |
2262 | bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8); | |
2263 | bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4); | |
2264 | bfd_vma addr = 0, word = 0; | |
2265 | int n_bytes = 0, n_words = 0; | |
2266 | struct obj_section *sec; | |
2267 | gdb_byte *entry = NULL; | |
2268 | ||
2269 | /* Extract address of start of function. */ | |
2270 | idx = ((idx & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2271 | idx += exidx_vma + i * 8; | |
2272 | ||
2273 | /* Find section containing function and compute section offset. */ | |
2274 | sec = arm_obj_section_from_vma (objfile, idx); | |
2275 | if (sec == NULL) | |
2276 | continue; | |
2277 | idx -= bfd_get_section_vma (objfile->obfd, sec->the_bfd_section); | |
2278 | ||
2279 | /* Determine address of exception table entry. */ | |
2280 | if (val == 1) | |
2281 | { | |
2282 | /* EXIDX_CANTUNWIND -- no exception table entry present. */ | |
2283 | } | |
2284 | else if ((val & 0xff000000) == 0x80000000) | |
2285 | { | |
2286 | /* Exception table entry embedded in .ARM.exidx | |
2287 | -- must be short form. */ | |
2288 | word = val; | |
2289 | n_bytes = 3; | |
2290 | } | |
2291 | else if (!(val & 0x80000000)) | |
2292 | { | |
2293 | /* Exception table entry in .ARM.extab. */ | |
2294 | addr = ((val & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2295 | addr += exidx_vma + i * 8 + 4; | |
2296 | ||
2297 | if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size) | |
2298 | { | |
2299 | word = bfd_h_get_32 (objfile->obfd, | |
2300 | extab_data + addr - extab_vma); | |
2301 | addr += 4; | |
2302 | ||
2303 | if ((word & 0xff000000) == 0x80000000) | |
2304 | { | |
2305 | /* Short form. */ | |
2306 | n_bytes = 3; | |
2307 | } | |
2308 | else if ((word & 0xff000000) == 0x81000000 | |
2309 | || (word & 0xff000000) == 0x82000000) | |
2310 | { | |
2311 | /* Long form. */ | |
2312 | n_bytes = 2; | |
2313 | n_words = ((word >> 16) & 0xff); | |
2314 | } | |
2315 | else if (!(word & 0x80000000)) | |
2316 | { | |
2317 | bfd_vma pers; | |
2318 | struct obj_section *pers_sec; | |
2319 | int gnu_personality = 0; | |
2320 | ||
2321 | /* Custom personality routine. */ | |
2322 | pers = ((word & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2323 | pers = UNMAKE_THUMB_ADDR (pers + addr - 4); | |
2324 | ||
2325 | /* Check whether we've got one of the variants of the | |
2326 | GNU personality routines. */ | |
2327 | pers_sec = arm_obj_section_from_vma (objfile, pers); | |
2328 | if (pers_sec) | |
2329 | { | |
2330 | static const char *personality[] = | |
2331 | { | |
2332 | "__gcc_personality_v0", | |
2333 | "__gxx_personality_v0", | |
2334 | "__gcj_personality_v0", | |
2335 | "__gnu_objc_personality_v0", | |
2336 | NULL | |
2337 | }; | |
2338 | ||
2339 | CORE_ADDR pc = pers + obj_section_offset (pers_sec); | |
2340 | int k; | |
2341 | ||
2342 | for (k = 0; personality[k]; k++) | |
2343 | if (lookup_minimal_symbol_by_pc_name | |
2344 | (pc, personality[k], objfile)) | |
2345 | { | |
2346 | gnu_personality = 1; | |
2347 | break; | |
2348 | } | |
2349 | } | |
2350 | ||
2351 | /* If so, the next word contains a word count in the high | |
2352 | byte, followed by the same unwind instructions as the | |
2353 | pre-defined forms. */ | |
2354 | if (gnu_personality | |
2355 | && addr + 4 <= extab_vma + extab_size) | |
2356 | { | |
2357 | word = bfd_h_get_32 (objfile->obfd, | |
2358 | extab_data + addr - extab_vma); | |
2359 | addr += 4; | |
2360 | n_bytes = 3; | |
2361 | n_words = ((word >> 24) & 0xff); | |
2362 | } | |
2363 | } | |
2364 | } | |
2365 | } | |
2366 | ||
2367 | /* Sanity check address. */ | |
2368 | if (n_words) | |
2369 | if (addr < extab_vma || addr + 4 * n_words > extab_vma + extab_size) | |
2370 | n_words = n_bytes = 0; | |
2371 | ||
2372 | /* The unwind instructions reside in WORD (only the N_BYTES least | |
2373 | significant bytes are valid), followed by N_WORDS words in the | |
2374 | extab section starting at ADDR. */ | |
2375 | if (n_bytes || n_words) | |
2376 | { | |
2377 | gdb_byte *p = entry = obstack_alloc (&objfile->objfile_obstack, | |
2378 | n_bytes + n_words * 4 + 1); | |
2379 | ||
2380 | while (n_bytes--) | |
2381 | *p++ = (gdb_byte) ((word >> (8 * n_bytes)) & 0xff); | |
2382 | ||
2383 | while (n_words--) | |
2384 | { | |
2385 | word = bfd_h_get_32 (objfile->obfd, | |
2386 | extab_data + addr - extab_vma); | |
2387 | addr += 4; | |
2388 | ||
2389 | *p++ = (gdb_byte) ((word >> 24) & 0xff); | |
2390 | *p++ = (gdb_byte) ((word >> 16) & 0xff); | |
2391 | *p++ = (gdb_byte) ((word >> 8) & 0xff); | |
2392 | *p++ = (gdb_byte) (word & 0xff); | |
2393 | } | |
2394 | ||
2395 | /* Implied "Finish" to terminate the list. */ | |
2396 | *p++ = 0xb0; | |
2397 | } | |
2398 | ||
2399 | /* Push entry onto vector. They are guaranteed to always | |
2400 | appear in order of increasing addresses. */ | |
2401 | new_exidx_entry.addr = idx; | |
2402 | new_exidx_entry.entry = entry; | |
2403 | VEC_safe_push (arm_exidx_entry_s, | |
2404 | data->section_maps[sec->the_bfd_section->index], | |
2405 | &new_exidx_entry); | |
2406 | } | |
2407 | ||
2408 | do_cleanups (cleanups); | |
2409 | } | |
2410 | ||
2411 | /* Search for the exception table entry covering MEMADDR. If one is found, | |
2412 | return a pointer to its data. Otherwise, return 0. If START is non-NULL, | |
2413 | set *START to the start of the region covered by this entry. */ | |
2414 | ||
2415 | static gdb_byte * | |
2416 | arm_find_exidx_entry (CORE_ADDR memaddr, CORE_ADDR *start) | |
2417 | { | |
2418 | struct obj_section *sec; | |
2419 | ||
2420 | sec = find_pc_section (memaddr); | |
2421 | if (sec != NULL) | |
2422 | { | |
2423 | struct arm_exidx_data *data; | |
2424 | VEC(arm_exidx_entry_s) *map; | |
2425 | struct arm_exidx_entry map_key = { memaddr - obj_section_addr (sec), 0 }; | |
2426 | unsigned int idx; | |
2427 | ||
2428 | data = objfile_data (sec->objfile, arm_exidx_data_key); | |
2429 | if (data != NULL) | |
2430 | { | |
2431 | map = data->section_maps[sec->the_bfd_section->index]; | |
2432 | if (!VEC_empty (arm_exidx_entry_s, map)) | |
2433 | { | |
2434 | struct arm_exidx_entry *map_sym; | |
2435 | ||
2436 | idx = VEC_lower_bound (arm_exidx_entry_s, map, &map_key, | |
2437 | arm_compare_exidx_entries); | |
2438 | ||
2439 | /* VEC_lower_bound finds the earliest ordered insertion | |
2440 | point. If the following symbol starts at this exact | |
2441 | address, we use that; otherwise, the preceding | |
2442 | exception table entry covers this address. */ | |
2443 | if (idx < VEC_length (arm_exidx_entry_s, map)) | |
2444 | { | |
2445 | map_sym = VEC_index (arm_exidx_entry_s, map, idx); | |
2446 | if (map_sym->addr == map_key.addr) | |
2447 | { | |
2448 | if (start) | |
2449 | *start = map_sym->addr + obj_section_addr (sec); | |
2450 | return map_sym->entry; | |
2451 | } | |
2452 | } | |
2453 | ||
2454 | if (idx > 0) | |
2455 | { | |
2456 | map_sym = VEC_index (arm_exidx_entry_s, map, idx - 1); | |
2457 | if (start) | |
2458 | *start = map_sym->addr + obj_section_addr (sec); | |
2459 | return map_sym->entry; | |
2460 | } | |
2461 | } | |
2462 | } | |
2463 | } | |
2464 | ||
2465 | return NULL; | |
2466 | } | |
2467 | ||
2468 | /* Given the current frame THIS_FRAME, and its associated frame unwinding | |
2469 | instruction list from the ARM exception table entry ENTRY, allocate and | |
2470 | return a prologue cache structure describing how to unwind this frame. | |
2471 | ||
2472 | Return NULL if the unwinding instruction list contains a "spare", | |
2473 | "reserved" or "refuse to unwind" instruction as defined in section | |
2474 | "9.3 Frame unwinding instructions" of the "Exception Handling ABI | |
2475 | for the ARM Architecture" document. */ | |
2476 | ||
2477 | static struct arm_prologue_cache * | |
2478 | arm_exidx_fill_cache (struct frame_info *this_frame, gdb_byte *entry) | |
2479 | { | |
2480 | CORE_ADDR vsp = 0; | |
2481 | int vsp_valid = 0; | |
2482 | ||
2483 | struct arm_prologue_cache *cache; | |
2484 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2485 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2486 | ||
2487 | for (;;) | |
2488 | { | |
2489 | gdb_byte insn; | |
2490 | ||
2491 | /* Whenever we reload SP, we actually have to retrieve its | |
2492 | actual value in the current frame. */ | |
2493 | if (!vsp_valid) | |
2494 | { | |
2495 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2496 | { | |
2497 | int reg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2498 | vsp = get_frame_register_unsigned (this_frame, reg); | |
2499 | } | |
2500 | else | |
2501 | { | |
2502 | CORE_ADDR addr = cache->saved_regs[ARM_SP_REGNUM].addr; | |
2503 | vsp = get_frame_memory_unsigned (this_frame, addr, 4); | |
2504 | } | |
2505 | ||
2506 | vsp_valid = 1; | |
2507 | } | |
2508 | ||
2509 | /* Decode next unwind instruction. */ | |
2510 | insn = *entry++; | |
2511 | ||
2512 | if ((insn & 0xc0) == 0) | |
2513 | { | |
2514 | int offset = insn & 0x3f; | |
2515 | vsp += (offset << 2) + 4; | |
2516 | } | |
2517 | else if ((insn & 0xc0) == 0x40) | |
2518 | { | |
2519 | int offset = insn & 0x3f; | |
2520 | vsp -= (offset << 2) + 4; | |
2521 | } | |
2522 | else if ((insn & 0xf0) == 0x80) | |
2523 | { | |
2524 | int mask = ((insn & 0xf) << 8) | *entry++; | |
2525 | int i; | |
2526 | ||
2527 | /* The special case of an all-zero mask identifies | |
2528 | "Refuse to unwind". We return NULL to fall back | |
2529 | to the prologue analyzer. */ | |
2530 | if (mask == 0) | |
2531 | return NULL; | |
2532 | ||
2533 | /* Pop registers r4..r15 under mask. */ | |
2534 | for (i = 0; i < 12; i++) | |
2535 | if (mask & (1 << i)) | |
2536 | { | |
2537 | cache->saved_regs[4 + i].addr = vsp; | |
2538 | vsp += 4; | |
2539 | } | |
2540 | ||
2541 | /* Special-case popping SP -- we need to reload vsp. */ | |
2542 | if (mask & (1 << (ARM_SP_REGNUM - 4))) | |
2543 | vsp_valid = 0; | |
2544 | } | |
2545 | else if ((insn & 0xf0) == 0x90) | |
2546 | { | |
2547 | int reg = insn & 0xf; | |
2548 | ||
2549 | /* Reserved cases. */ | |
2550 | if (reg == ARM_SP_REGNUM || reg == ARM_PC_REGNUM) | |
2551 | return NULL; | |
2552 | ||
2553 | /* Set SP from another register and mark VSP for reload. */ | |
2554 | cache->saved_regs[ARM_SP_REGNUM] = cache->saved_regs[reg]; | |
2555 | vsp_valid = 0; | |
2556 | } | |
2557 | else if ((insn & 0xf0) == 0xa0) | |
2558 | { | |
2559 | int count = insn & 0x7; | |
2560 | int pop_lr = (insn & 0x8) != 0; | |
2561 | int i; | |
2562 | ||
2563 | /* Pop r4..r[4+count]. */ | |
2564 | for (i = 0; i <= count; i++) | |
2565 | { | |
2566 | cache->saved_regs[4 + i].addr = vsp; | |
2567 | vsp += 4; | |
2568 | } | |
2569 | ||
2570 | /* If indicated by flag, pop LR as well. */ | |
2571 | if (pop_lr) | |
2572 | { | |
2573 | cache->saved_regs[ARM_LR_REGNUM].addr = vsp; | |
2574 | vsp += 4; | |
2575 | } | |
2576 | } | |
2577 | else if (insn == 0xb0) | |
2578 | { | |
2579 | /* We could only have updated PC by popping into it; if so, it | |
2580 | will show up as address. Otherwise, copy LR into PC. */ | |
2581 | if (!trad_frame_addr_p (cache->saved_regs, ARM_PC_REGNUM)) | |
2582 | cache->saved_regs[ARM_PC_REGNUM] | |
2583 | = cache->saved_regs[ARM_LR_REGNUM]; | |
2584 | ||
2585 | /* We're done. */ | |
2586 | break; | |
2587 | } | |
2588 | else if (insn == 0xb1) | |
2589 | { | |
2590 | int mask = *entry++; | |
2591 | int i; | |
2592 | ||
2593 | /* All-zero mask and mask >= 16 is "spare". */ | |
2594 | if (mask == 0 || mask >= 16) | |
2595 | return NULL; | |
2596 | ||
2597 | /* Pop r0..r3 under mask. */ | |
2598 | for (i = 0; i < 4; i++) | |
2599 | if (mask & (1 << i)) | |
2600 | { | |
2601 | cache->saved_regs[i].addr = vsp; | |
2602 | vsp += 4; | |
2603 | } | |
2604 | } | |
2605 | else if (insn == 0xb2) | |
2606 | { | |
2607 | ULONGEST offset = 0; | |
2608 | unsigned shift = 0; | |
2609 | ||
2610 | do | |
2611 | { | |
2612 | offset |= (*entry & 0x7f) << shift; | |
2613 | shift += 7; | |
2614 | } | |
2615 | while (*entry++ & 0x80); | |
2616 | ||
2617 | vsp += 0x204 + (offset << 2); | |
2618 | } | |
2619 | else if (insn == 0xb3) | |
2620 | { | |
2621 | int start = *entry >> 4; | |
2622 | int count = (*entry++) & 0xf; | |
2623 | int i; | |
2624 | ||
2625 | /* Only registers D0..D15 are valid here. */ | |
2626 | if (start + count >= 16) | |
2627 | return NULL; | |
2628 | ||
2629 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2630 | for (i = 0; i <= count; i++) | |
2631 | { | |
2632 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2633 | vsp += 8; | |
2634 | } | |
2635 | ||
2636 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2637 | vsp += 4; | |
2638 | } | |
2639 | else if ((insn & 0xf8) == 0xb8) | |
2640 | { | |
2641 | int count = insn & 0x7; | |
2642 | int i; | |
2643 | ||
2644 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2645 | for (i = 0; i <= count; i++) | |
2646 | { | |
2647 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2648 | vsp += 8; | |
2649 | } | |
2650 | ||
2651 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2652 | vsp += 4; | |
2653 | } | |
2654 | else if (insn == 0xc6) | |
2655 | { | |
2656 | int start = *entry >> 4; | |
2657 | int count = (*entry++) & 0xf; | |
2658 | int i; | |
2659 | ||
2660 | /* Only registers WR0..WR15 are valid. */ | |
2661 | if (start + count >= 16) | |
2662 | return NULL; | |
2663 | ||
2664 | /* Pop iwmmx registers WR[start]..WR[start+count]. */ | |
2665 | for (i = 0; i <= count; i++) | |
2666 | { | |
2667 | cache->saved_regs[ARM_WR0_REGNUM + start + i].addr = vsp; | |
2668 | vsp += 8; | |
2669 | } | |
2670 | } | |
2671 | else if (insn == 0xc7) | |
2672 | { | |
2673 | int mask = *entry++; | |
2674 | int i; | |
2675 | ||
2676 | /* All-zero mask and mask >= 16 is "spare". */ | |
2677 | if (mask == 0 || mask >= 16) | |
2678 | return NULL; | |
2679 | ||
2680 | /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */ | |
2681 | for (i = 0; i < 4; i++) | |
2682 | if (mask & (1 << i)) | |
2683 | { | |
2684 | cache->saved_regs[ARM_WCGR0_REGNUM + i].addr = vsp; | |
2685 | vsp += 4; | |
2686 | } | |
2687 | } | |
2688 | else if ((insn & 0xf8) == 0xc0) | |
2689 | { | |
2690 | int count = insn & 0x7; | |
2691 | int i; | |
2692 | ||
2693 | /* Pop iwmmx registers WR[10]..WR[10+count]. */ | |
2694 | for (i = 0; i <= count; i++) | |
2695 | { | |
2696 | cache->saved_regs[ARM_WR0_REGNUM + 10 + i].addr = vsp; | |
2697 | vsp += 8; | |
2698 | } | |
2699 | } | |
2700 | else if (insn == 0xc8) | |
2701 | { | |
2702 | int start = *entry >> 4; | |
2703 | int count = (*entry++) & 0xf; | |
2704 | int i; | |
2705 | ||
2706 | /* Only registers D0..D31 are valid. */ | |
2707 | if (start + count >= 16) | |
2708 | return NULL; | |
2709 | ||
2710 | /* Pop VFP double-precision registers | |
2711 | D[16+start]..D[16+start+count]. */ | |
2712 | for (i = 0; i <= count; i++) | |
2713 | { | |
2714 | cache->saved_regs[ARM_D0_REGNUM + 16 + start + i].addr = vsp; | |
2715 | vsp += 8; | |
2716 | } | |
2717 | } | |
2718 | else if (insn == 0xc9) | |
2719 | { | |
2720 | int start = *entry >> 4; | |
2721 | int count = (*entry++) & 0xf; | |
2722 | int i; | |
2723 | ||
2724 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2725 | for (i = 0; i <= count; i++) | |
2726 | { | |
2727 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2728 | vsp += 8; | |
2729 | } | |
2730 | } | |
2731 | else if ((insn & 0xf8) == 0xd0) | |
2732 | { | |
2733 | int count = insn & 0x7; | |
2734 | int i; | |
2735 | ||
2736 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2737 | for (i = 0; i <= count; i++) | |
2738 | { | |
2739 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2740 | vsp += 8; | |
2741 | } | |
2742 | } | |
2743 | else | |
2744 | { | |
2745 | /* Everything else is "spare". */ | |
2746 | return NULL; | |
2747 | } | |
2748 | } | |
2749 | ||
2750 | /* If we restore SP from a register, assume this was the frame register. | |
2751 | Otherwise just fall back to SP as frame register. */ | |
2752 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2753 | cache->framereg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2754 | else | |
2755 | cache->framereg = ARM_SP_REGNUM; | |
2756 | ||
2757 | /* Determine offset to previous frame. */ | |
2758 | cache->framesize | |
2759 | = vsp - get_frame_register_unsigned (this_frame, cache->framereg); | |
2760 | ||
2761 | /* We already got the previous SP. */ | |
2762 | cache->prev_sp = vsp; | |
2763 | ||
2764 | return cache; | |
2765 | } | |
2766 | ||
2767 | /* Unwinding via ARM exception table entries. Note that the sniffer | |
2768 | already computes a filled-in prologue cache, which is then used | |
2769 | with the same arm_prologue_this_id and arm_prologue_prev_register | |
2770 | routines also used for prologue-parsing based unwinding. */ | |
2771 | ||
2772 | static int | |
2773 | arm_exidx_unwind_sniffer (const struct frame_unwind *self, | |
2774 | struct frame_info *this_frame, | |
2775 | void **this_prologue_cache) | |
2776 | { | |
2777 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2778 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
2779 | CORE_ADDR addr_in_block, exidx_region, func_start; | |
2780 | struct arm_prologue_cache *cache; | |
2781 | gdb_byte *entry; | |
2782 | ||
2783 | /* See if we have an ARM exception table entry covering this address. */ | |
2784 | addr_in_block = get_frame_address_in_block (this_frame); | |
2785 | entry = arm_find_exidx_entry (addr_in_block, &exidx_region); | |
2786 | if (!entry) | |
2787 | return 0; | |
2788 | ||
2789 | /* The ARM exception table does not describe unwind information | |
2790 | for arbitrary PC values, but is guaranteed to be correct only | |
2791 | at call sites. We have to decide here whether we want to use | |
2792 | ARM exception table information for this frame, or fall back | |
2793 | to using prologue parsing. (Note that if we have DWARF CFI, | |
2794 | this sniffer isn't even called -- CFI is always preferred.) | |
2795 | ||
2796 | Before we make this decision, however, we check whether we | |
2797 | actually have *symbol* information for the current frame. | |
2798 | If not, prologue parsing would not work anyway, so we might | |
2799 | as well use the exception table and hope for the best. */ | |
2800 | if (find_pc_partial_function (addr_in_block, NULL, &func_start, NULL)) | |
2801 | { | |
2802 | int exc_valid = 0; | |
2803 | ||
2804 | /* If the next frame is "normal", we are at a call site in this | |
2805 | frame, so exception information is guaranteed to be valid. */ | |
2806 | if (get_next_frame (this_frame) | |
2807 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME) | |
2808 | exc_valid = 1; | |
2809 | ||
2810 | /* We also assume exception information is valid if we're currently | |
2811 | blocked in a system call. The system library is supposed to | |
2812 | ensure this, so that e.g. pthread cancellation works. */ | |
2813 | if (arm_frame_is_thumb (this_frame)) | |
2814 | { | |
2815 | LONGEST insn; | |
2816 | ||
2817 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 2, 2, | |
2818 | byte_order_for_code, &insn) | |
2819 | && (insn & 0xff00) == 0xdf00 /* svc */) | |
2820 | exc_valid = 1; | |
2821 | } | |
2822 | else | |
2823 | { | |
2824 | LONGEST insn; | |
2825 | ||
2826 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 4, 4, | |
2827 | byte_order_for_code, &insn) | |
2828 | && (insn & 0x0f000000) == 0x0f000000 /* svc */) | |
2829 | exc_valid = 1; | |
2830 | } | |
2831 | ||
2832 | /* Bail out if we don't know that exception information is valid. */ | |
2833 | if (!exc_valid) | |
2834 | return 0; | |
2835 | ||
2836 | /* The ARM exception index does not mark the *end* of the region | |
2837 | covered by the entry, and some functions will not have any entry. | |
2838 | To correctly recognize the end of the covered region, the linker | |
2839 | should have inserted dummy records with a CANTUNWIND marker. | |
2840 | ||
2841 | Unfortunately, current versions of GNU ld do not reliably do | |
2842 | this, and thus we may have found an incorrect entry above. | |
2843 | As a (temporary) sanity check, we only use the entry if it | |
2844 | lies *within* the bounds of the function. Note that this check | |
2845 | might reject perfectly valid entries that just happen to cover | |
2846 | multiple functions; therefore this check ought to be removed | |
2847 | once the linker is fixed. */ | |
2848 | if (func_start > exidx_region) | |
2849 | return 0; | |
2850 | } | |
2851 | ||
2852 | /* Decode the list of unwinding instructions into a prologue cache. | |
2853 | Note that this may fail due to e.g. a "refuse to unwind" code. */ | |
2854 | cache = arm_exidx_fill_cache (this_frame, entry); | |
2855 | if (!cache) | |
2856 | return 0; | |
2857 | ||
2858 | *this_prologue_cache = cache; | |
2859 | return 1; | |
2860 | } | |
2861 | ||
2862 | struct frame_unwind arm_exidx_unwind = { | |
2863 | NORMAL_FRAME, | |
8fbca658 | 2864 | default_frame_unwind_stop_reason, |
0e9e9abd UW |
2865 | arm_prologue_this_id, |
2866 | arm_prologue_prev_register, | |
2867 | NULL, | |
2868 | arm_exidx_unwind_sniffer | |
2869 | }; | |
2870 | ||
909cf6ea | 2871 | static struct arm_prologue_cache * |
a262aec2 | 2872 | arm_make_stub_cache (struct frame_info *this_frame) |
909cf6ea | 2873 | { |
909cf6ea | 2874 | struct arm_prologue_cache *cache; |
909cf6ea | 2875 | |
35d5d4ee | 2876 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2877 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
909cf6ea | 2878 | |
a262aec2 | 2879 | cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); |
909cf6ea DJ |
2880 | |
2881 | return cache; | |
2882 | } | |
2883 | ||
2884 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
2885 | ||
2886 | static void | |
a262aec2 | 2887 | arm_stub_this_id (struct frame_info *this_frame, |
909cf6ea DJ |
2888 | void **this_cache, |
2889 | struct frame_id *this_id) | |
2890 | { | |
2891 | struct arm_prologue_cache *cache; | |
2892 | ||
2893 | if (*this_cache == NULL) | |
a262aec2 | 2894 | *this_cache = arm_make_stub_cache (this_frame); |
909cf6ea DJ |
2895 | cache = *this_cache; |
2896 | ||
a262aec2 | 2897 | *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame)); |
909cf6ea DJ |
2898 | } |
2899 | ||
a262aec2 DJ |
2900 | static int |
2901 | arm_stub_unwind_sniffer (const struct frame_unwind *self, | |
2902 | struct frame_info *this_frame, | |
2903 | void **this_prologue_cache) | |
909cf6ea | 2904 | { |
93d42b30 | 2905 | CORE_ADDR addr_in_block; |
909cf6ea DJ |
2906 | char dummy[4]; |
2907 | ||
a262aec2 | 2908 | addr_in_block = get_frame_address_in_block (this_frame); |
93d42b30 | 2909 | if (in_plt_section (addr_in_block, NULL) |
fc36e839 DE |
2910 | /* We also use the stub winder if the target memory is unreadable |
2911 | to avoid having the prologue unwinder trying to read it. */ | |
a262aec2 DJ |
2912 | || target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0) |
2913 | return 1; | |
909cf6ea | 2914 | |
a262aec2 | 2915 | return 0; |
909cf6ea DJ |
2916 | } |
2917 | ||
a262aec2 DJ |
2918 | struct frame_unwind arm_stub_unwind = { |
2919 | NORMAL_FRAME, | |
8fbca658 | 2920 | default_frame_unwind_stop_reason, |
a262aec2 DJ |
2921 | arm_stub_this_id, |
2922 | arm_prologue_prev_register, | |
2923 | NULL, | |
2924 | arm_stub_unwind_sniffer | |
2925 | }; | |
2926 | ||
2ae28aa9 YQ |
2927 | /* Put here the code to store, into CACHE->saved_regs, the addresses |
2928 | of the saved registers of frame described by THIS_FRAME. CACHE is | |
2929 | returned. */ | |
2930 | ||
2931 | static struct arm_prologue_cache * | |
2932 | arm_m_exception_cache (struct frame_info *this_frame) | |
2933 | { | |
2934 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2935 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
2936 | struct arm_prologue_cache *cache; | |
2937 | CORE_ADDR unwound_sp; | |
2938 | LONGEST xpsr; | |
2939 | ||
2940 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2941 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2942 | ||
2943 | unwound_sp = get_frame_register_unsigned (this_frame, | |
2944 | ARM_SP_REGNUM); | |
2945 | ||
2946 | /* The hardware saves eight 32-bit words, comprising xPSR, | |
2947 | ReturnAddress, LR (R14), R12, R3, R2, R1, R0. See details in | |
2948 | "B1.5.6 Exception entry behavior" in | |
2949 | "ARMv7-M Architecture Reference Manual". */ | |
2950 | cache->saved_regs[0].addr = unwound_sp; | |
2951 | cache->saved_regs[1].addr = unwound_sp + 4; | |
2952 | cache->saved_regs[2].addr = unwound_sp + 8; | |
2953 | cache->saved_regs[3].addr = unwound_sp + 12; | |
2954 | cache->saved_regs[12].addr = unwound_sp + 16; | |
2955 | cache->saved_regs[14].addr = unwound_sp + 20; | |
2956 | cache->saved_regs[15].addr = unwound_sp + 24; | |
2957 | cache->saved_regs[ARM_PS_REGNUM].addr = unwound_sp + 28; | |
2958 | ||
2959 | /* If bit 9 of the saved xPSR is set, then there is a four-byte | |
2960 | aligner between the top of the 32-byte stack frame and the | |
2961 | previous context's stack pointer. */ | |
2962 | cache->prev_sp = unwound_sp + 32; | |
2963 | if (safe_read_memory_integer (unwound_sp + 28, 4, byte_order, &xpsr) | |
2964 | && (xpsr & (1 << 9)) != 0) | |
2965 | cache->prev_sp += 4; | |
2966 | ||
2967 | return cache; | |
2968 | } | |
2969 | ||
2970 | /* Implementation of function hook 'this_id' in | |
2971 | 'struct frame_uwnind'. */ | |
2972 | ||
2973 | static void | |
2974 | arm_m_exception_this_id (struct frame_info *this_frame, | |
2975 | void **this_cache, | |
2976 | struct frame_id *this_id) | |
2977 | { | |
2978 | struct arm_prologue_cache *cache; | |
2979 | ||
2980 | if (*this_cache == NULL) | |
2981 | *this_cache = arm_m_exception_cache (this_frame); | |
2982 | cache = *this_cache; | |
2983 | ||
2984 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
2985 | *this_id = frame_id_build (cache->prev_sp, | |
2986 | get_frame_pc (this_frame)); | |
2987 | } | |
2988 | ||
2989 | /* Implementation of function hook 'prev_register' in | |
2990 | 'struct frame_uwnind'. */ | |
2991 | ||
2992 | static struct value * | |
2993 | arm_m_exception_prev_register (struct frame_info *this_frame, | |
2994 | void **this_cache, | |
2995 | int prev_regnum) | |
2996 | { | |
2997 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2998 | struct arm_prologue_cache *cache; | |
2999 | ||
3000 | if (*this_cache == NULL) | |
3001 | *this_cache = arm_m_exception_cache (this_frame); | |
3002 | cache = *this_cache; | |
3003 | ||
3004 | /* The value was already reconstructed into PREV_SP. */ | |
3005 | if (prev_regnum == ARM_SP_REGNUM) | |
3006 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
3007 | cache->prev_sp); | |
3008 | ||
3009 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, | |
3010 | prev_regnum); | |
3011 | } | |
3012 | ||
3013 | /* Implementation of function hook 'sniffer' in | |
3014 | 'struct frame_uwnind'. */ | |
3015 | ||
3016 | static int | |
3017 | arm_m_exception_unwind_sniffer (const struct frame_unwind *self, | |
3018 | struct frame_info *this_frame, | |
3019 | void **this_prologue_cache) | |
3020 | { | |
3021 | CORE_ADDR this_pc = get_frame_pc (this_frame); | |
3022 | ||
3023 | /* No need to check is_m; this sniffer is only registered for | |
3024 | M-profile architectures. */ | |
3025 | ||
3026 | /* Exception frames return to one of these magic PCs. Other values | |
3027 | are not defined as of v7-M. See details in "B1.5.8 Exception | |
3028 | return behavior" in "ARMv7-M Architecture Reference Manual". */ | |
3029 | if (this_pc == 0xfffffff1 || this_pc == 0xfffffff9 | |
3030 | || this_pc == 0xfffffffd) | |
3031 | return 1; | |
3032 | ||
3033 | return 0; | |
3034 | } | |
3035 | ||
3036 | /* Frame unwinder for M-profile exceptions. */ | |
3037 | ||
3038 | struct frame_unwind arm_m_exception_unwind = | |
3039 | { | |
3040 | SIGTRAMP_FRAME, | |
3041 | default_frame_unwind_stop_reason, | |
3042 | arm_m_exception_this_id, | |
3043 | arm_m_exception_prev_register, | |
3044 | NULL, | |
3045 | arm_m_exception_unwind_sniffer | |
3046 | }; | |
3047 | ||
24de872b | 3048 | static CORE_ADDR |
a262aec2 | 3049 | arm_normal_frame_base (struct frame_info *this_frame, void **this_cache) |
24de872b DJ |
3050 | { |
3051 | struct arm_prologue_cache *cache; | |
3052 | ||
eb5492fa | 3053 | if (*this_cache == NULL) |
a262aec2 | 3054 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa DJ |
3055 | cache = *this_cache; |
3056 | ||
4be43953 | 3057 | return cache->prev_sp - cache->framesize; |
24de872b DJ |
3058 | } |
3059 | ||
eb5492fa DJ |
3060 | struct frame_base arm_normal_base = { |
3061 | &arm_prologue_unwind, | |
3062 | arm_normal_frame_base, | |
3063 | arm_normal_frame_base, | |
3064 | arm_normal_frame_base | |
3065 | }; | |
3066 | ||
a262aec2 | 3067 | /* Assuming THIS_FRAME is a dummy, return the frame ID of that |
eb5492fa DJ |
3068 | dummy frame. The frame ID's base needs to match the TOS value |
3069 | saved by save_dummy_frame_tos() and returned from | |
3070 | arm_push_dummy_call, and the PC needs to match the dummy frame's | |
3071 | breakpoint. */ | |
c906108c | 3072 | |
eb5492fa | 3073 | static struct frame_id |
a262aec2 | 3074 | arm_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
c906108c | 3075 | { |
0963b4bd MS |
3076 | return frame_id_build (get_frame_register_unsigned (this_frame, |
3077 | ARM_SP_REGNUM), | |
a262aec2 | 3078 | get_frame_pc (this_frame)); |
eb5492fa | 3079 | } |
c3b4394c | 3080 | |
eb5492fa DJ |
3081 | /* Given THIS_FRAME, find the previous frame's resume PC (which will |
3082 | be used to construct the previous frame's ID, after looking up the | |
3083 | containing function). */ | |
c3b4394c | 3084 | |
eb5492fa DJ |
3085 | static CORE_ADDR |
3086 | arm_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame) | |
3087 | { | |
3088 | CORE_ADDR pc; | |
3089 | pc = frame_unwind_register_unsigned (this_frame, ARM_PC_REGNUM); | |
24568a2c | 3090 | return arm_addr_bits_remove (gdbarch, pc); |
eb5492fa DJ |
3091 | } |
3092 | ||
3093 | static CORE_ADDR | |
3094 | arm_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame) | |
3095 | { | |
3096 | return frame_unwind_register_unsigned (this_frame, ARM_SP_REGNUM); | |
c906108c SS |
3097 | } |
3098 | ||
b39cc962 DJ |
3099 | static struct value * |
3100 | arm_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache, | |
3101 | int regnum) | |
3102 | { | |
24568a2c | 3103 | struct gdbarch * gdbarch = get_frame_arch (this_frame); |
b39cc962 | 3104 | CORE_ADDR lr, cpsr; |
9779414d | 3105 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
3106 | |
3107 | switch (regnum) | |
3108 | { | |
3109 | case ARM_PC_REGNUM: | |
3110 | /* The PC is normally copied from the return column, which | |
3111 | describes saves of LR. However, that version may have an | |
3112 | extra bit set to indicate Thumb state. The bit is not | |
3113 | part of the PC. */ | |
3114 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
3115 | return frame_unwind_got_constant (this_frame, regnum, | |
24568a2c | 3116 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 DJ |
3117 | |
3118 | case ARM_PS_REGNUM: | |
3119 | /* Reconstruct the T bit; see arm_prologue_prev_register for details. */ | |
ca38c58e | 3120 | cpsr = get_frame_register_unsigned (this_frame, regnum); |
b39cc962 DJ |
3121 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
3122 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 3123 | cpsr |= t_bit; |
b39cc962 | 3124 | else |
9779414d | 3125 | cpsr &= ~t_bit; |
ca38c58e | 3126 | return frame_unwind_got_constant (this_frame, regnum, cpsr); |
b39cc962 DJ |
3127 | |
3128 | default: | |
3129 | internal_error (__FILE__, __LINE__, | |
3130 | _("Unexpected register %d"), regnum); | |
3131 | } | |
3132 | } | |
3133 | ||
3134 | static void | |
3135 | arm_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
3136 | struct dwarf2_frame_state_reg *reg, | |
3137 | struct frame_info *this_frame) | |
3138 | { | |
3139 | switch (regnum) | |
3140 | { | |
3141 | case ARM_PC_REGNUM: | |
3142 | case ARM_PS_REGNUM: | |
3143 | reg->how = DWARF2_FRAME_REG_FN; | |
3144 | reg->loc.fn = arm_dwarf2_prev_register; | |
3145 | break; | |
3146 | case ARM_SP_REGNUM: | |
3147 | reg->how = DWARF2_FRAME_REG_CFA; | |
3148 | break; | |
3149 | } | |
3150 | } | |
3151 | ||
4024ca99 UW |
3152 | /* Return true if we are in the function's epilogue, i.e. after the |
3153 | instruction that destroyed the function's stack frame. */ | |
3154 | ||
3155 | static int | |
3156 | thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3157 | { | |
3158 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3159 | unsigned int insn, insn2; | |
3160 | int found_return = 0, found_stack_adjust = 0; | |
3161 | CORE_ADDR func_start, func_end; | |
3162 | CORE_ADDR scan_pc; | |
3163 | gdb_byte buf[4]; | |
3164 | ||
3165 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3166 | return 0; | |
3167 | ||
3168 | /* The epilogue is a sequence of instructions along the following lines: | |
3169 | ||
3170 | - add stack frame size to SP or FP | |
3171 | - [if frame pointer used] restore SP from FP | |
3172 | - restore registers from SP [may include PC] | |
3173 | - a return-type instruction [if PC wasn't already restored] | |
3174 | ||
3175 | In a first pass, we scan forward from the current PC and verify the | |
3176 | instructions we find as compatible with this sequence, ending in a | |
3177 | return instruction. | |
3178 | ||
3179 | However, this is not sufficient to distinguish indirect function calls | |
3180 | within a function from indirect tail calls in the epilogue in some cases. | |
3181 | Therefore, if we didn't already find any SP-changing instruction during | |
3182 | forward scan, we add a backward scanning heuristic to ensure we actually | |
3183 | are in the epilogue. */ | |
3184 | ||
3185 | scan_pc = pc; | |
3186 | while (scan_pc < func_end && !found_return) | |
3187 | { | |
3188 | if (target_read_memory (scan_pc, buf, 2)) | |
3189 | break; | |
3190 | ||
3191 | scan_pc += 2; | |
3192 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3193 | ||
3194 | if ((insn & 0xff80) == 0x4700) /* bx <Rm> */ | |
3195 | found_return = 1; | |
3196 | else if (insn == 0x46f7) /* mov pc, lr */ | |
3197 | found_return = 1; | |
3198 | else if (insn == 0x46bd) /* mov sp, r7 */ | |
3199 | found_stack_adjust = 1; | |
3200 | else if ((insn & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */ | |
3201 | found_stack_adjust = 1; | |
3202 | else if ((insn & 0xfe00) == 0xbc00) /* pop <registers> */ | |
3203 | { | |
3204 | found_stack_adjust = 1; | |
3205 | if (insn & 0x0100) /* <registers> include PC. */ | |
3206 | found_return = 1; | |
3207 | } | |
db24da6d | 3208 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instruction */ |
4024ca99 UW |
3209 | { |
3210 | if (target_read_memory (scan_pc, buf, 2)) | |
3211 | break; | |
3212 | ||
3213 | scan_pc += 2; | |
3214 | insn2 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3215 | ||
3216 | if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3217 | { | |
3218 | found_stack_adjust = 1; | |
3219 | if (insn2 & 0x8000) /* <registers> include PC. */ | |
3220 | found_return = 1; | |
3221 | } | |
3222 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3223 | && (insn2 & 0x0fff) == 0x0b04) | |
3224 | { | |
3225 | found_stack_adjust = 1; | |
3226 | if ((insn2 & 0xf000) == 0xf000) /* <Rt> is PC. */ | |
3227 | found_return = 1; | |
3228 | } | |
3229 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3230 | && (insn2 & 0x0e00) == 0x0a00) | |
3231 | found_stack_adjust = 1; | |
3232 | else | |
3233 | break; | |
3234 | } | |
3235 | else | |
3236 | break; | |
3237 | } | |
3238 | ||
3239 | if (!found_return) | |
3240 | return 0; | |
3241 | ||
3242 | /* Since any instruction in the epilogue sequence, with the possible | |
3243 | exception of return itself, updates the stack pointer, we need to | |
3244 | scan backwards for at most one instruction. Try either a 16-bit or | |
3245 | a 32-bit instruction. This is just a heuristic, so we do not worry | |
0963b4bd | 3246 | too much about false positives. */ |
4024ca99 UW |
3247 | |
3248 | if (!found_stack_adjust) | |
3249 | { | |
3250 | if (pc - 4 < func_start) | |
3251 | return 0; | |
3252 | if (target_read_memory (pc - 4, buf, 4)) | |
3253 | return 0; | |
3254 | ||
3255 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3256 | insn2 = extract_unsigned_integer (buf + 2, 2, byte_order_for_code); | |
3257 | ||
3258 | if (insn2 == 0x46bd) /* mov sp, r7 */ | |
3259 | found_stack_adjust = 1; | |
3260 | else if ((insn2 & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */ | |
3261 | found_stack_adjust = 1; | |
3262 | else if ((insn2 & 0xff00) == 0xbc00) /* pop <registers> without PC */ | |
3263 | found_stack_adjust = 1; | |
3264 | else if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3265 | found_stack_adjust = 1; | |
3266 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3267 | && (insn2 & 0x0fff) == 0x0b04) | |
3268 | found_stack_adjust = 1; | |
3269 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3270 | && (insn2 & 0x0e00) == 0x0a00) | |
3271 | found_stack_adjust = 1; | |
3272 | } | |
3273 | ||
3274 | return found_stack_adjust; | |
3275 | } | |
3276 | ||
3277 | /* Return true if we are in the function's epilogue, i.e. after the | |
3278 | instruction that destroyed the function's stack frame. */ | |
3279 | ||
3280 | static int | |
3281 | arm_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3282 | { | |
3283 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3284 | unsigned int insn; | |
3285 | int found_return, found_stack_adjust; | |
3286 | CORE_ADDR func_start, func_end; | |
3287 | ||
3288 | if (arm_pc_is_thumb (gdbarch, pc)) | |
3289 | return thumb_in_function_epilogue_p (gdbarch, pc); | |
3290 | ||
3291 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3292 | return 0; | |
3293 | ||
3294 | /* We are in the epilogue if the previous instruction was a stack | |
3295 | adjustment and the next instruction is a possible return (bx, mov | |
3296 | pc, or pop). We could have to scan backwards to find the stack | |
3297 | adjustment, or forwards to find the return, but this is a decent | |
3298 | approximation. First scan forwards. */ | |
3299 | ||
3300 | found_return = 0; | |
3301 | insn = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
3302 | if (bits (insn, 28, 31) != INST_NV) | |
3303 | { | |
3304 | if ((insn & 0x0ffffff0) == 0x012fff10) | |
3305 | /* BX. */ | |
3306 | found_return = 1; | |
3307 | else if ((insn & 0x0ffffff0) == 0x01a0f000) | |
3308 | /* MOV PC. */ | |
3309 | found_return = 1; | |
3310 | else if ((insn & 0x0fff0000) == 0x08bd0000 | |
3311 | && (insn & 0x0000c000) != 0) | |
3312 | /* POP (LDMIA), including PC or LR. */ | |
3313 | found_return = 1; | |
3314 | } | |
3315 | ||
3316 | if (!found_return) | |
3317 | return 0; | |
3318 | ||
3319 | /* Scan backwards. This is just a heuristic, so do not worry about | |
3320 | false positives from mode changes. */ | |
3321 | ||
3322 | if (pc < func_start + 4) | |
3323 | return 0; | |
3324 | ||
73c964d6 | 3325 | found_stack_adjust = 0; |
4024ca99 UW |
3326 | insn = read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code); |
3327 | if (bits (insn, 28, 31) != INST_NV) | |
3328 | { | |
3329 | if ((insn & 0x0df0f000) == 0x0080d000) | |
3330 | /* ADD SP (register or immediate). */ | |
3331 | found_stack_adjust = 1; | |
3332 | else if ((insn & 0x0df0f000) == 0x0040d000) | |
3333 | /* SUB SP (register or immediate). */ | |
3334 | found_stack_adjust = 1; | |
3335 | else if ((insn & 0x0ffffff0) == 0x01a0d000) | |
3336 | /* MOV SP. */ | |
77bc0675 | 3337 | found_stack_adjust = 1; |
4024ca99 UW |
3338 | else if ((insn & 0x0fff0000) == 0x08bd0000) |
3339 | /* POP (LDMIA). */ | |
3340 | found_stack_adjust = 1; | |
fc51cce1 MGD |
3341 | else if ((insn & 0x0fff0000) == 0x049d0000) |
3342 | /* POP of a single register. */ | |
3343 | found_stack_adjust = 1; | |
4024ca99 UW |
3344 | } |
3345 | ||
3346 | if (found_stack_adjust) | |
3347 | return 1; | |
3348 | ||
3349 | return 0; | |
3350 | } | |
3351 | ||
3352 | ||
2dd604e7 RE |
3353 | /* When arguments must be pushed onto the stack, they go on in reverse |
3354 | order. The code below implements a FILO (stack) to do this. */ | |
3355 | ||
3356 | struct stack_item | |
3357 | { | |
3358 | int len; | |
3359 | struct stack_item *prev; | |
3360 | void *data; | |
3361 | }; | |
3362 | ||
3363 | static struct stack_item * | |
8c6363cf | 3364 | push_stack_item (struct stack_item *prev, const void *contents, int len) |
2dd604e7 RE |
3365 | { |
3366 | struct stack_item *si; | |
3367 | si = xmalloc (sizeof (struct stack_item)); | |
226c7fbc | 3368 | si->data = xmalloc (len); |
2dd604e7 RE |
3369 | si->len = len; |
3370 | si->prev = prev; | |
3371 | memcpy (si->data, contents, len); | |
3372 | return si; | |
3373 | } | |
3374 | ||
3375 | static struct stack_item * | |
3376 | pop_stack_item (struct stack_item *si) | |
3377 | { | |
3378 | struct stack_item *dead = si; | |
3379 | si = si->prev; | |
3380 | xfree (dead->data); | |
3381 | xfree (dead); | |
3382 | return si; | |
3383 | } | |
3384 | ||
2af48f68 PB |
3385 | |
3386 | /* Return the alignment (in bytes) of the given type. */ | |
3387 | ||
3388 | static int | |
3389 | arm_type_align (struct type *t) | |
3390 | { | |
3391 | int n; | |
3392 | int align; | |
3393 | int falign; | |
3394 | ||
3395 | t = check_typedef (t); | |
3396 | switch (TYPE_CODE (t)) | |
3397 | { | |
3398 | default: | |
3399 | /* Should never happen. */ | |
3400 | internal_error (__FILE__, __LINE__, _("unknown type alignment")); | |
3401 | return 4; | |
3402 | ||
3403 | case TYPE_CODE_PTR: | |
3404 | case TYPE_CODE_ENUM: | |
3405 | case TYPE_CODE_INT: | |
3406 | case TYPE_CODE_FLT: | |
3407 | case TYPE_CODE_SET: | |
3408 | case TYPE_CODE_RANGE: | |
2af48f68 PB |
3409 | case TYPE_CODE_REF: |
3410 | case TYPE_CODE_CHAR: | |
3411 | case TYPE_CODE_BOOL: | |
3412 | return TYPE_LENGTH (t); | |
3413 | ||
3414 | case TYPE_CODE_ARRAY: | |
3415 | case TYPE_CODE_COMPLEX: | |
3416 | /* TODO: What about vector types? */ | |
3417 | return arm_type_align (TYPE_TARGET_TYPE (t)); | |
3418 | ||
3419 | case TYPE_CODE_STRUCT: | |
3420 | case TYPE_CODE_UNION: | |
3421 | align = 1; | |
3422 | for (n = 0; n < TYPE_NFIELDS (t); n++) | |
3423 | { | |
3424 | falign = arm_type_align (TYPE_FIELD_TYPE (t, n)); | |
3425 | if (falign > align) | |
3426 | align = falign; | |
3427 | } | |
3428 | return align; | |
3429 | } | |
3430 | } | |
3431 | ||
90445bd3 DJ |
3432 | /* Possible base types for a candidate for passing and returning in |
3433 | VFP registers. */ | |
3434 | ||
3435 | enum arm_vfp_cprc_base_type | |
3436 | { | |
3437 | VFP_CPRC_UNKNOWN, | |
3438 | VFP_CPRC_SINGLE, | |
3439 | VFP_CPRC_DOUBLE, | |
3440 | VFP_CPRC_VEC64, | |
3441 | VFP_CPRC_VEC128 | |
3442 | }; | |
3443 | ||
3444 | /* The length of one element of base type B. */ | |
3445 | ||
3446 | static unsigned | |
3447 | arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b) | |
3448 | { | |
3449 | switch (b) | |
3450 | { | |
3451 | case VFP_CPRC_SINGLE: | |
3452 | return 4; | |
3453 | case VFP_CPRC_DOUBLE: | |
3454 | return 8; | |
3455 | case VFP_CPRC_VEC64: | |
3456 | return 8; | |
3457 | case VFP_CPRC_VEC128: | |
3458 | return 16; | |
3459 | default: | |
3460 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3461 | (int) b); | |
3462 | } | |
3463 | } | |
3464 | ||
3465 | /* The character ('s', 'd' or 'q') for the type of VFP register used | |
3466 | for passing base type B. */ | |
3467 | ||
3468 | static int | |
3469 | arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b) | |
3470 | { | |
3471 | switch (b) | |
3472 | { | |
3473 | case VFP_CPRC_SINGLE: | |
3474 | return 's'; | |
3475 | case VFP_CPRC_DOUBLE: | |
3476 | return 'd'; | |
3477 | case VFP_CPRC_VEC64: | |
3478 | return 'd'; | |
3479 | case VFP_CPRC_VEC128: | |
3480 | return 'q'; | |
3481 | default: | |
3482 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3483 | (int) b); | |
3484 | } | |
3485 | } | |
3486 | ||
3487 | /* Determine whether T may be part of a candidate for passing and | |
3488 | returning in VFP registers, ignoring the limit on the total number | |
3489 | of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the | |
3490 | classification of the first valid component found; if it is not | |
3491 | VFP_CPRC_UNKNOWN, all components must have the same classification | |
3492 | as *BASE_TYPE. If it is found that T contains a type not permitted | |
3493 | for passing and returning in VFP registers, a type differently | |
3494 | classified from *BASE_TYPE, or two types differently classified | |
3495 | from each other, return -1, otherwise return the total number of | |
3496 | base-type elements found (possibly 0 in an empty structure or | |
3497 | array). Vectors and complex types are not currently supported, | |
3498 | matching the generic AAPCS support. */ | |
3499 | ||
3500 | static int | |
3501 | arm_vfp_cprc_sub_candidate (struct type *t, | |
3502 | enum arm_vfp_cprc_base_type *base_type) | |
3503 | { | |
3504 | t = check_typedef (t); | |
3505 | switch (TYPE_CODE (t)) | |
3506 | { | |
3507 | case TYPE_CODE_FLT: | |
3508 | switch (TYPE_LENGTH (t)) | |
3509 | { | |
3510 | case 4: | |
3511 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3512 | *base_type = VFP_CPRC_SINGLE; | |
3513 | else if (*base_type != VFP_CPRC_SINGLE) | |
3514 | return -1; | |
3515 | return 1; | |
3516 | ||
3517 | case 8: | |
3518 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3519 | *base_type = VFP_CPRC_DOUBLE; | |
3520 | else if (*base_type != VFP_CPRC_DOUBLE) | |
3521 | return -1; | |
3522 | return 1; | |
3523 | ||
3524 | default: | |
3525 | return -1; | |
3526 | } | |
3527 | break; | |
3528 | ||
3529 | case TYPE_CODE_ARRAY: | |
3530 | { | |
3531 | int count; | |
3532 | unsigned unitlen; | |
3533 | count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type); | |
3534 | if (count == -1) | |
3535 | return -1; | |
3536 | if (TYPE_LENGTH (t) == 0) | |
3537 | { | |
3538 | gdb_assert (count == 0); | |
3539 | return 0; | |
3540 | } | |
3541 | else if (count == 0) | |
3542 | return -1; | |
3543 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3544 | gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0); | |
3545 | return TYPE_LENGTH (t) / unitlen; | |
3546 | } | |
3547 | break; | |
3548 | ||
3549 | case TYPE_CODE_STRUCT: | |
3550 | { | |
3551 | int count = 0; | |
3552 | unsigned unitlen; | |
3553 | int i; | |
3554 | for (i = 0; i < TYPE_NFIELDS (t); i++) | |
3555 | { | |
3556 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), | |
3557 | base_type); | |
3558 | if (sub_count == -1) | |
3559 | return -1; | |
3560 | count += sub_count; | |
3561 | } | |
3562 | if (TYPE_LENGTH (t) == 0) | |
3563 | { | |
3564 | gdb_assert (count == 0); | |
3565 | return 0; | |
3566 | } | |
3567 | else if (count == 0) | |
3568 | return -1; | |
3569 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3570 | if (TYPE_LENGTH (t) != unitlen * count) | |
3571 | return -1; | |
3572 | return count; | |
3573 | } | |
3574 | ||
3575 | case TYPE_CODE_UNION: | |
3576 | { | |
3577 | int count = 0; | |
3578 | unsigned unitlen; | |
3579 | int i; | |
3580 | for (i = 0; i < TYPE_NFIELDS (t); i++) | |
3581 | { | |
3582 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), | |
3583 | base_type); | |
3584 | if (sub_count == -1) | |
3585 | return -1; | |
3586 | count = (count > sub_count ? count : sub_count); | |
3587 | } | |
3588 | if (TYPE_LENGTH (t) == 0) | |
3589 | { | |
3590 | gdb_assert (count == 0); | |
3591 | return 0; | |
3592 | } | |
3593 | else if (count == 0) | |
3594 | return -1; | |
3595 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3596 | if (TYPE_LENGTH (t) != unitlen * count) | |
3597 | return -1; | |
3598 | return count; | |
3599 | } | |
3600 | ||
3601 | default: | |
3602 | break; | |
3603 | } | |
3604 | ||
3605 | return -1; | |
3606 | } | |
3607 | ||
3608 | /* Determine whether T is a VFP co-processor register candidate (CPRC) | |
3609 | if passed to or returned from a non-variadic function with the VFP | |
3610 | ABI in effect. Return 1 if it is, 0 otherwise. If it is, set | |
3611 | *BASE_TYPE to the base type for T and *COUNT to the number of | |
3612 | elements of that base type before returning. */ | |
3613 | ||
3614 | static int | |
3615 | arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type, | |
3616 | int *count) | |
3617 | { | |
3618 | enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN; | |
3619 | int c = arm_vfp_cprc_sub_candidate (t, &b); | |
3620 | if (c <= 0 || c > 4) | |
3621 | return 0; | |
3622 | *base_type = b; | |
3623 | *count = c; | |
3624 | return 1; | |
3625 | } | |
3626 | ||
3627 | /* Return 1 if the VFP ABI should be used for passing arguments to and | |
3628 | returning values from a function of type FUNC_TYPE, 0 | |
3629 | otherwise. */ | |
3630 | ||
3631 | static int | |
3632 | arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type) | |
3633 | { | |
3634 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3635 | /* Variadic functions always use the base ABI. Assume that functions | |
3636 | without debug info are not variadic. */ | |
3637 | if (func_type && TYPE_VARARGS (check_typedef (func_type))) | |
3638 | return 0; | |
3639 | /* The VFP ABI is only supported as a variant of AAPCS. */ | |
3640 | if (tdep->arm_abi != ARM_ABI_AAPCS) | |
3641 | return 0; | |
3642 | return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP; | |
3643 | } | |
3644 | ||
3645 | /* We currently only support passing parameters in integer registers, which | |
3646 | conforms with GCC's default model, and VFP argument passing following | |
3647 | the VFP variant of AAPCS. Several other variants exist and | |
2dd604e7 RE |
3648 | we should probably support some of them based on the selected ABI. */ |
3649 | ||
3650 | static CORE_ADDR | |
7d9b040b | 3651 | arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
6a65450a AC |
3652 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
3653 | struct value **args, CORE_ADDR sp, int struct_return, | |
3654 | CORE_ADDR struct_addr) | |
2dd604e7 | 3655 | { |
e17a4113 | 3656 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
2dd604e7 RE |
3657 | int argnum; |
3658 | int argreg; | |
3659 | int nstack; | |
3660 | struct stack_item *si = NULL; | |
90445bd3 DJ |
3661 | int use_vfp_abi; |
3662 | struct type *ftype; | |
3663 | unsigned vfp_regs_free = (1 << 16) - 1; | |
3664 | ||
3665 | /* Determine the type of this function and whether the VFP ABI | |
3666 | applies. */ | |
3667 | ftype = check_typedef (value_type (function)); | |
3668 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
3669 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
3670 | use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype); | |
2dd604e7 | 3671 | |
6a65450a AC |
3672 | /* Set the return address. For the ARM, the return breakpoint is |
3673 | always at BP_ADDR. */ | |
9779414d | 3674 | if (arm_pc_is_thumb (gdbarch, bp_addr)) |
9dca5578 | 3675 | bp_addr |= 1; |
6a65450a | 3676 | regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, bp_addr); |
2dd604e7 RE |
3677 | |
3678 | /* Walk through the list of args and determine how large a temporary | |
3679 | stack is required. Need to take care here as structs may be | |
7a9dd1b2 | 3680 | passed on the stack, and we have to push them. */ |
2dd604e7 RE |
3681 | nstack = 0; |
3682 | ||
3683 | argreg = ARM_A1_REGNUM; | |
3684 | nstack = 0; | |
3685 | ||
2dd604e7 RE |
3686 | /* The struct_return pointer occupies the first parameter |
3687 | passing register. */ | |
3688 | if (struct_return) | |
3689 | { | |
3690 | if (arm_debug) | |
5af949e3 | 3691 | fprintf_unfiltered (gdb_stdlog, "struct return in %s = %s\n", |
2af46ca0 | 3692 | gdbarch_register_name (gdbarch, argreg), |
5af949e3 | 3693 | paddress (gdbarch, struct_addr)); |
2dd604e7 RE |
3694 | regcache_cooked_write_unsigned (regcache, argreg, struct_addr); |
3695 | argreg++; | |
3696 | } | |
3697 | ||
3698 | for (argnum = 0; argnum < nargs; argnum++) | |
3699 | { | |
3700 | int len; | |
3701 | struct type *arg_type; | |
3702 | struct type *target_type; | |
3703 | enum type_code typecode; | |
8c6363cf | 3704 | const bfd_byte *val; |
2af48f68 | 3705 | int align; |
90445bd3 DJ |
3706 | enum arm_vfp_cprc_base_type vfp_base_type; |
3707 | int vfp_base_count; | |
3708 | int may_use_core_reg = 1; | |
2dd604e7 | 3709 | |
df407dfe | 3710 | arg_type = check_typedef (value_type (args[argnum])); |
2dd604e7 RE |
3711 | len = TYPE_LENGTH (arg_type); |
3712 | target_type = TYPE_TARGET_TYPE (arg_type); | |
3713 | typecode = TYPE_CODE (arg_type); | |
8c6363cf | 3714 | val = value_contents (args[argnum]); |
2dd604e7 | 3715 | |
2af48f68 PB |
3716 | align = arm_type_align (arg_type); |
3717 | /* Round alignment up to a whole number of words. */ | |
3718 | align = (align + INT_REGISTER_SIZE - 1) & ~(INT_REGISTER_SIZE - 1); | |
3719 | /* Different ABIs have different maximum alignments. */ | |
3720 | if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_APCS) | |
3721 | { | |
3722 | /* The APCS ABI only requires word alignment. */ | |
3723 | align = INT_REGISTER_SIZE; | |
3724 | } | |
3725 | else | |
3726 | { | |
3727 | /* The AAPCS requires at most doubleword alignment. */ | |
3728 | if (align > INT_REGISTER_SIZE * 2) | |
3729 | align = INT_REGISTER_SIZE * 2; | |
3730 | } | |
3731 | ||
90445bd3 DJ |
3732 | if (use_vfp_abi |
3733 | && arm_vfp_call_candidate (arg_type, &vfp_base_type, | |
3734 | &vfp_base_count)) | |
3735 | { | |
3736 | int regno; | |
3737 | int unit_length; | |
3738 | int shift; | |
3739 | unsigned mask; | |
3740 | ||
3741 | /* Because this is a CPRC it cannot go in a core register or | |
3742 | cause a core register to be skipped for alignment. | |
3743 | Either it goes in VFP registers and the rest of this loop | |
3744 | iteration is skipped for this argument, or it goes on the | |
3745 | stack (and the stack alignment code is correct for this | |
3746 | case). */ | |
3747 | may_use_core_reg = 0; | |
3748 | ||
3749 | unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
3750 | shift = unit_length / 4; | |
3751 | mask = (1 << (shift * vfp_base_count)) - 1; | |
3752 | for (regno = 0; regno < 16; regno += shift) | |
3753 | if (((vfp_regs_free >> regno) & mask) == mask) | |
3754 | break; | |
3755 | ||
3756 | if (regno < 16) | |
3757 | { | |
3758 | int reg_char; | |
3759 | int reg_scaled; | |
3760 | int i; | |
3761 | ||
3762 | vfp_regs_free &= ~(mask << regno); | |
3763 | reg_scaled = regno / shift; | |
3764 | reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
3765 | for (i = 0; i < vfp_base_count; i++) | |
3766 | { | |
3767 | char name_buf[4]; | |
3768 | int regnum; | |
58d6951d DJ |
3769 | if (reg_char == 'q') |
3770 | arm_neon_quad_write (gdbarch, regcache, reg_scaled + i, | |
90445bd3 | 3771 | val + i * unit_length); |
58d6951d DJ |
3772 | else |
3773 | { | |
8c042590 PM |
3774 | xsnprintf (name_buf, sizeof (name_buf), "%c%d", |
3775 | reg_char, reg_scaled + i); | |
58d6951d DJ |
3776 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
3777 | strlen (name_buf)); | |
3778 | regcache_cooked_write (regcache, regnum, | |
3779 | val + i * unit_length); | |
3780 | } | |
90445bd3 DJ |
3781 | } |
3782 | continue; | |
3783 | } | |
3784 | else | |
3785 | { | |
3786 | /* This CPRC could not go in VFP registers, so all VFP | |
3787 | registers are now marked as used. */ | |
3788 | vfp_regs_free = 0; | |
3789 | } | |
3790 | } | |
3791 | ||
2af48f68 PB |
3792 | /* Push stack padding for dowubleword alignment. */ |
3793 | if (nstack & (align - 1)) | |
3794 | { | |
3795 | si = push_stack_item (si, val, INT_REGISTER_SIZE); | |
3796 | nstack += INT_REGISTER_SIZE; | |
3797 | } | |
3798 | ||
3799 | /* Doubleword aligned quantities must go in even register pairs. */ | |
90445bd3 DJ |
3800 | if (may_use_core_reg |
3801 | && argreg <= ARM_LAST_ARG_REGNUM | |
2af48f68 PB |
3802 | && align > INT_REGISTER_SIZE |
3803 | && argreg & 1) | |
3804 | argreg++; | |
3805 | ||
2dd604e7 RE |
3806 | /* If the argument is a pointer to a function, and it is a |
3807 | Thumb function, create a LOCAL copy of the value and set | |
3808 | the THUMB bit in it. */ | |
3809 | if (TYPE_CODE_PTR == typecode | |
3810 | && target_type != NULL | |
f96b8fa0 | 3811 | && TYPE_CODE_FUNC == TYPE_CODE (check_typedef (target_type))) |
2dd604e7 | 3812 | { |
e17a4113 | 3813 | CORE_ADDR regval = extract_unsigned_integer (val, len, byte_order); |
9779414d | 3814 | if (arm_pc_is_thumb (gdbarch, regval)) |
2dd604e7 | 3815 | { |
8c6363cf TT |
3816 | bfd_byte *copy = alloca (len); |
3817 | store_unsigned_integer (copy, len, byte_order, | |
e17a4113 | 3818 | MAKE_THUMB_ADDR (regval)); |
8c6363cf | 3819 | val = copy; |
2dd604e7 RE |
3820 | } |
3821 | } | |
3822 | ||
3823 | /* Copy the argument to general registers or the stack in | |
3824 | register-sized pieces. Large arguments are split between | |
3825 | registers and stack. */ | |
3826 | while (len > 0) | |
3827 | { | |
f0c9063c | 3828 | int partial_len = len < INT_REGISTER_SIZE ? len : INT_REGISTER_SIZE; |
2dd604e7 | 3829 | |
90445bd3 | 3830 | if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM) |
2dd604e7 RE |
3831 | { |
3832 | /* The argument is being passed in a general purpose | |
3833 | register. */ | |
e17a4113 UW |
3834 | CORE_ADDR regval |
3835 | = extract_unsigned_integer (val, partial_len, byte_order); | |
3836 | if (byte_order == BFD_ENDIAN_BIG) | |
8bf8793c | 3837 | regval <<= (INT_REGISTER_SIZE - partial_len) * 8; |
2dd604e7 RE |
3838 | if (arm_debug) |
3839 | fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n", | |
c9f4d572 UW |
3840 | argnum, |
3841 | gdbarch_register_name | |
2af46ca0 | 3842 | (gdbarch, argreg), |
f0c9063c | 3843 | phex (regval, INT_REGISTER_SIZE)); |
2dd604e7 RE |
3844 | regcache_cooked_write_unsigned (regcache, argreg, regval); |
3845 | argreg++; | |
3846 | } | |
3847 | else | |
3848 | { | |
3849 | /* Push the arguments onto the stack. */ | |
3850 | if (arm_debug) | |
3851 | fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n", | |
3852 | argnum, nstack); | |
f0c9063c UW |
3853 | si = push_stack_item (si, val, INT_REGISTER_SIZE); |
3854 | nstack += INT_REGISTER_SIZE; | |
2dd604e7 RE |
3855 | } |
3856 | ||
3857 | len -= partial_len; | |
3858 | val += partial_len; | |
3859 | } | |
3860 | } | |
3861 | /* If we have an odd number of words to push, then decrement the stack | |
3862 | by one word now, so first stack argument will be dword aligned. */ | |
3863 | if (nstack & 4) | |
3864 | sp -= 4; | |
3865 | ||
3866 | while (si) | |
3867 | { | |
3868 | sp -= si->len; | |
3869 | write_memory (sp, si->data, si->len); | |
3870 | si = pop_stack_item (si); | |
3871 | } | |
3872 | ||
3873 | /* Finally, update teh SP register. */ | |
3874 | regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp); | |
3875 | ||
3876 | return sp; | |
3877 | } | |
3878 | ||
f53f0d0b PB |
3879 | |
3880 | /* Always align the frame to an 8-byte boundary. This is required on | |
3881 | some platforms and harmless on the rest. */ | |
3882 | ||
3883 | static CORE_ADDR | |
3884 | arm_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
3885 | { | |
3886 | /* Align the stack to eight bytes. */ | |
3887 | return sp & ~ (CORE_ADDR) 7; | |
3888 | } | |
3889 | ||
c906108c | 3890 | static void |
ed9a39eb | 3891 | print_fpu_flags (int flags) |
c906108c | 3892 | { |
c5aa993b JM |
3893 | if (flags & (1 << 0)) |
3894 | fputs ("IVO ", stdout); | |
3895 | if (flags & (1 << 1)) | |
3896 | fputs ("DVZ ", stdout); | |
3897 | if (flags & (1 << 2)) | |
3898 | fputs ("OFL ", stdout); | |
3899 | if (flags & (1 << 3)) | |
3900 | fputs ("UFL ", stdout); | |
3901 | if (flags & (1 << 4)) | |
3902 | fputs ("INX ", stdout); | |
3903 | putchar ('\n'); | |
c906108c SS |
3904 | } |
3905 | ||
5e74b15c RE |
3906 | /* Print interesting information about the floating point processor |
3907 | (if present) or emulator. */ | |
34e8f22d | 3908 | static void |
d855c300 | 3909 | arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
23e3a7ac | 3910 | struct frame_info *frame, const char *args) |
c906108c | 3911 | { |
9c9acae0 | 3912 | unsigned long status = get_frame_register_unsigned (frame, ARM_FPS_REGNUM); |
c5aa993b JM |
3913 | int type; |
3914 | ||
3915 | type = (status >> 24) & 127; | |
edefbb7c AC |
3916 | if (status & (1 << 31)) |
3917 | printf (_("Hardware FPU type %d\n"), type); | |
3918 | else | |
3919 | printf (_("Software FPU type %d\n"), type); | |
3920 | /* i18n: [floating point unit] mask */ | |
3921 | fputs (_("mask: "), stdout); | |
c5aa993b | 3922 | print_fpu_flags (status >> 16); |
edefbb7c AC |
3923 | /* i18n: [floating point unit] flags */ |
3924 | fputs (_("flags: "), stdout); | |
c5aa993b | 3925 | print_fpu_flags (status); |
c906108c SS |
3926 | } |
3927 | ||
27067745 UW |
3928 | /* Construct the ARM extended floating point type. */ |
3929 | static struct type * | |
3930 | arm_ext_type (struct gdbarch *gdbarch) | |
3931 | { | |
3932 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3933 | ||
3934 | if (!tdep->arm_ext_type) | |
3935 | tdep->arm_ext_type | |
e9bb382b | 3936 | = arch_float_type (gdbarch, -1, "builtin_type_arm_ext", |
27067745 UW |
3937 | floatformats_arm_ext); |
3938 | ||
3939 | return tdep->arm_ext_type; | |
3940 | } | |
3941 | ||
58d6951d DJ |
3942 | static struct type * |
3943 | arm_neon_double_type (struct gdbarch *gdbarch) | |
3944 | { | |
3945 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3946 | ||
3947 | if (tdep->neon_double_type == NULL) | |
3948 | { | |
3949 | struct type *t, *elem; | |
3950 | ||
3951 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_d", | |
3952 | TYPE_CODE_UNION); | |
3953 | elem = builtin_type (gdbarch)->builtin_uint8; | |
3954 | append_composite_type_field (t, "u8", init_vector_type (elem, 8)); | |
3955 | elem = builtin_type (gdbarch)->builtin_uint16; | |
3956 | append_composite_type_field (t, "u16", init_vector_type (elem, 4)); | |
3957 | elem = builtin_type (gdbarch)->builtin_uint32; | |
3958 | append_composite_type_field (t, "u32", init_vector_type (elem, 2)); | |
3959 | elem = builtin_type (gdbarch)->builtin_uint64; | |
3960 | append_composite_type_field (t, "u64", elem); | |
3961 | elem = builtin_type (gdbarch)->builtin_float; | |
3962 | append_composite_type_field (t, "f32", init_vector_type (elem, 2)); | |
3963 | elem = builtin_type (gdbarch)->builtin_double; | |
3964 | append_composite_type_field (t, "f64", elem); | |
3965 | ||
3966 | TYPE_VECTOR (t) = 1; | |
3967 | TYPE_NAME (t) = "neon_d"; | |
3968 | tdep->neon_double_type = t; | |
3969 | } | |
3970 | ||
3971 | return tdep->neon_double_type; | |
3972 | } | |
3973 | ||
3974 | /* FIXME: The vector types are not correctly ordered on big-endian | |
3975 | targets. Just as s0 is the low bits of d0, d0[0] is also the low | |
3976 | bits of d0 - regardless of what unit size is being held in d0. So | |
3977 | the offset of the first uint8 in d0 is 7, but the offset of the | |
3978 | first float is 4. This code works as-is for little-endian | |
3979 | targets. */ | |
3980 | ||
3981 | static struct type * | |
3982 | arm_neon_quad_type (struct gdbarch *gdbarch) | |
3983 | { | |
3984 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3985 | ||
3986 | if (tdep->neon_quad_type == NULL) | |
3987 | { | |
3988 | struct type *t, *elem; | |
3989 | ||
3990 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_q", | |
3991 | TYPE_CODE_UNION); | |
3992 | elem = builtin_type (gdbarch)->builtin_uint8; | |
3993 | append_composite_type_field (t, "u8", init_vector_type (elem, 16)); | |
3994 | elem = builtin_type (gdbarch)->builtin_uint16; | |
3995 | append_composite_type_field (t, "u16", init_vector_type (elem, 8)); | |
3996 | elem = builtin_type (gdbarch)->builtin_uint32; | |
3997 | append_composite_type_field (t, "u32", init_vector_type (elem, 4)); | |
3998 | elem = builtin_type (gdbarch)->builtin_uint64; | |
3999 | append_composite_type_field (t, "u64", init_vector_type (elem, 2)); | |
4000 | elem = builtin_type (gdbarch)->builtin_float; | |
4001 | append_composite_type_field (t, "f32", init_vector_type (elem, 4)); | |
4002 | elem = builtin_type (gdbarch)->builtin_double; | |
4003 | append_composite_type_field (t, "f64", init_vector_type (elem, 2)); | |
4004 | ||
4005 | TYPE_VECTOR (t) = 1; | |
4006 | TYPE_NAME (t) = "neon_q"; | |
4007 | tdep->neon_quad_type = t; | |
4008 | } | |
4009 | ||
4010 | return tdep->neon_quad_type; | |
4011 | } | |
4012 | ||
34e8f22d RE |
4013 | /* Return the GDB type object for the "standard" data type of data in |
4014 | register N. */ | |
4015 | ||
4016 | static struct type * | |
7a5ea0d4 | 4017 | arm_register_type (struct gdbarch *gdbarch, int regnum) |
032758dc | 4018 | { |
58d6951d DJ |
4019 | int num_regs = gdbarch_num_regs (gdbarch); |
4020 | ||
4021 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
4022 | && regnum >= num_regs && regnum < num_regs + 32) | |
4023 | return builtin_type (gdbarch)->builtin_float; | |
4024 | ||
4025 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
4026 | && regnum >= num_regs + 32 && regnum < num_regs + 32 + 16) | |
4027 | return arm_neon_quad_type (gdbarch); | |
4028 | ||
4029 | /* If the target description has register information, we are only | |
4030 | in this function so that we can override the types of | |
4031 | double-precision registers for NEON. */ | |
4032 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) | |
4033 | { | |
4034 | struct type *t = tdesc_register_type (gdbarch, regnum); | |
4035 | ||
4036 | if (regnum >= ARM_D0_REGNUM && regnum < ARM_D0_REGNUM + 32 | |
4037 | && TYPE_CODE (t) == TYPE_CODE_FLT | |
4038 | && gdbarch_tdep (gdbarch)->have_neon) | |
4039 | return arm_neon_double_type (gdbarch); | |
4040 | else | |
4041 | return t; | |
4042 | } | |
4043 | ||
34e8f22d | 4044 | if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS) |
58d6951d DJ |
4045 | { |
4046 | if (!gdbarch_tdep (gdbarch)->have_fpa_registers) | |
4047 | return builtin_type (gdbarch)->builtin_void; | |
4048 | ||
4049 | return arm_ext_type (gdbarch); | |
4050 | } | |
e4c16157 | 4051 | else if (regnum == ARM_SP_REGNUM) |
0dfff4cb | 4052 | return builtin_type (gdbarch)->builtin_data_ptr; |
e4c16157 | 4053 | else if (regnum == ARM_PC_REGNUM) |
0dfff4cb | 4054 | return builtin_type (gdbarch)->builtin_func_ptr; |
ff6f572f DJ |
4055 | else if (regnum >= ARRAY_SIZE (arm_register_names)) |
4056 | /* These registers are only supported on targets which supply | |
4057 | an XML description. */ | |
df4df182 | 4058 | return builtin_type (gdbarch)->builtin_int0; |
032758dc | 4059 | else |
df4df182 | 4060 | return builtin_type (gdbarch)->builtin_uint32; |
032758dc AC |
4061 | } |
4062 | ||
ff6f572f DJ |
4063 | /* Map a DWARF register REGNUM onto the appropriate GDB register |
4064 | number. */ | |
4065 | ||
4066 | static int | |
d3f73121 | 4067 | arm_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
ff6f572f DJ |
4068 | { |
4069 | /* Core integer regs. */ | |
4070 | if (reg >= 0 && reg <= 15) | |
4071 | return reg; | |
4072 | ||
4073 | /* Legacy FPA encoding. These were once used in a way which | |
4074 | overlapped with VFP register numbering, so their use is | |
4075 | discouraged, but GDB doesn't support the ARM toolchain | |
4076 | which used them for VFP. */ | |
4077 | if (reg >= 16 && reg <= 23) | |
4078 | return ARM_F0_REGNUM + reg - 16; | |
4079 | ||
4080 | /* New assignments for the FPA registers. */ | |
4081 | if (reg >= 96 && reg <= 103) | |
4082 | return ARM_F0_REGNUM + reg - 96; | |
4083 | ||
4084 | /* WMMX register assignments. */ | |
4085 | if (reg >= 104 && reg <= 111) | |
4086 | return ARM_WCGR0_REGNUM + reg - 104; | |
4087 | ||
4088 | if (reg >= 112 && reg <= 127) | |
4089 | return ARM_WR0_REGNUM + reg - 112; | |
4090 | ||
4091 | if (reg >= 192 && reg <= 199) | |
4092 | return ARM_WC0_REGNUM + reg - 192; | |
4093 | ||
58d6951d DJ |
4094 | /* VFP v2 registers. A double precision value is actually |
4095 | in d1 rather than s2, but the ABI only defines numbering | |
4096 | for the single precision registers. This will "just work" | |
4097 | in GDB for little endian targets (we'll read eight bytes, | |
4098 | starting in s0 and then progressing to s1), but will be | |
4099 | reversed on big endian targets with VFP. This won't | |
4100 | be a problem for the new Neon quad registers; you're supposed | |
4101 | to use DW_OP_piece for those. */ | |
4102 | if (reg >= 64 && reg <= 95) | |
4103 | { | |
4104 | char name_buf[4]; | |
4105 | ||
8c042590 | 4106 | xsnprintf (name_buf, sizeof (name_buf), "s%d", reg - 64); |
58d6951d DJ |
4107 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
4108 | strlen (name_buf)); | |
4109 | } | |
4110 | ||
4111 | /* VFP v3 / Neon registers. This range is also used for VFP v2 | |
4112 | registers, except that it now describes d0 instead of s0. */ | |
4113 | if (reg >= 256 && reg <= 287) | |
4114 | { | |
4115 | char name_buf[4]; | |
4116 | ||
8c042590 | 4117 | xsnprintf (name_buf, sizeof (name_buf), "d%d", reg - 256); |
58d6951d DJ |
4118 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
4119 | strlen (name_buf)); | |
4120 | } | |
4121 | ||
ff6f572f DJ |
4122 | return -1; |
4123 | } | |
4124 | ||
26216b98 AC |
4125 | /* Map GDB internal REGNUM onto the Arm simulator register numbers. */ |
4126 | static int | |
e7faf938 | 4127 | arm_register_sim_regno (struct gdbarch *gdbarch, int regnum) |
26216b98 AC |
4128 | { |
4129 | int reg = regnum; | |
e7faf938 | 4130 | gdb_assert (reg >= 0 && reg < gdbarch_num_regs (gdbarch)); |
26216b98 | 4131 | |
ff6f572f DJ |
4132 | if (regnum >= ARM_WR0_REGNUM && regnum <= ARM_WR15_REGNUM) |
4133 | return regnum - ARM_WR0_REGNUM + SIM_ARM_IWMMXT_COP0R0_REGNUM; | |
4134 | ||
4135 | if (regnum >= ARM_WC0_REGNUM && regnum <= ARM_WC7_REGNUM) | |
4136 | return regnum - ARM_WC0_REGNUM + SIM_ARM_IWMMXT_COP1R0_REGNUM; | |
4137 | ||
4138 | if (regnum >= ARM_WCGR0_REGNUM && regnum <= ARM_WCGR7_REGNUM) | |
4139 | return regnum - ARM_WCGR0_REGNUM + SIM_ARM_IWMMXT_COP1R8_REGNUM; | |
4140 | ||
26216b98 AC |
4141 | if (reg < NUM_GREGS) |
4142 | return SIM_ARM_R0_REGNUM + reg; | |
4143 | reg -= NUM_GREGS; | |
4144 | ||
4145 | if (reg < NUM_FREGS) | |
4146 | return SIM_ARM_FP0_REGNUM + reg; | |
4147 | reg -= NUM_FREGS; | |
4148 | ||
4149 | if (reg < NUM_SREGS) | |
4150 | return SIM_ARM_FPS_REGNUM + reg; | |
4151 | reg -= NUM_SREGS; | |
4152 | ||
edefbb7c | 4153 | internal_error (__FILE__, __LINE__, _("Bad REGNUM %d"), regnum); |
26216b98 | 4154 | } |
34e8f22d | 4155 | |
a37b3cc0 AC |
4156 | /* NOTE: cagney/2001-08-20: Both convert_from_extended() and |
4157 | convert_to_extended() use floatformat_arm_ext_littlebyte_bigword. | |
4158 | It is thought that this is is the floating-point register format on | |
4159 | little-endian systems. */ | |
c906108c | 4160 | |
ed9a39eb | 4161 | static void |
b508a996 | 4162 | convert_from_extended (const struct floatformat *fmt, const void *ptr, |
be8626e0 | 4163 | void *dbl, int endianess) |
c906108c | 4164 | { |
a37b3cc0 | 4165 | DOUBLEST d; |
be8626e0 MD |
4166 | |
4167 | if (endianess == BFD_ENDIAN_BIG) | |
a37b3cc0 AC |
4168 | floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d); |
4169 | else | |
4170 | floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
4171 | ptr, &d); | |
b508a996 | 4172 | floatformat_from_doublest (fmt, &d, dbl); |
c906108c SS |
4173 | } |
4174 | ||
34e8f22d | 4175 | static void |
be8626e0 MD |
4176 | convert_to_extended (const struct floatformat *fmt, void *dbl, const void *ptr, |
4177 | int endianess) | |
c906108c | 4178 | { |
a37b3cc0 | 4179 | DOUBLEST d; |
be8626e0 | 4180 | |
b508a996 | 4181 | floatformat_to_doublest (fmt, ptr, &d); |
be8626e0 | 4182 | if (endianess == BFD_ENDIAN_BIG) |
a37b3cc0 AC |
4183 | floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl); |
4184 | else | |
4185 | floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
4186 | &d, dbl); | |
c906108c | 4187 | } |
ed9a39eb | 4188 | |
c906108c | 4189 | static int |
ed9a39eb | 4190 | condition_true (unsigned long cond, unsigned long status_reg) |
c906108c SS |
4191 | { |
4192 | if (cond == INST_AL || cond == INST_NV) | |
4193 | return 1; | |
4194 | ||
4195 | switch (cond) | |
4196 | { | |
4197 | case INST_EQ: | |
4198 | return ((status_reg & FLAG_Z) != 0); | |
4199 | case INST_NE: | |
4200 | return ((status_reg & FLAG_Z) == 0); | |
4201 | case INST_CS: | |
4202 | return ((status_reg & FLAG_C) != 0); | |
4203 | case INST_CC: | |
4204 | return ((status_reg & FLAG_C) == 0); | |
4205 | case INST_MI: | |
4206 | return ((status_reg & FLAG_N) != 0); | |
4207 | case INST_PL: | |
4208 | return ((status_reg & FLAG_N) == 0); | |
4209 | case INST_VS: | |
4210 | return ((status_reg & FLAG_V) != 0); | |
4211 | case INST_VC: | |
4212 | return ((status_reg & FLAG_V) == 0); | |
4213 | case INST_HI: | |
4214 | return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C); | |
4215 | case INST_LS: | |
4216 | return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C); | |
4217 | case INST_GE: | |
4218 | return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)); | |
4219 | case INST_LT: | |
4220 | return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)); | |
4221 | case INST_GT: | |
f8bf5763 PM |
4222 | return (((status_reg & FLAG_Z) == 0) |
4223 | && (((status_reg & FLAG_N) == 0) | |
4224 | == ((status_reg & FLAG_V) == 0))); | |
c906108c | 4225 | case INST_LE: |
f8bf5763 PM |
4226 | return (((status_reg & FLAG_Z) != 0) |
4227 | || (((status_reg & FLAG_N) == 0) | |
4228 | != ((status_reg & FLAG_V) == 0))); | |
c906108c SS |
4229 | } |
4230 | return 1; | |
4231 | } | |
4232 | ||
c906108c | 4233 | static unsigned long |
0b1b3e42 UW |
4234 | shifted_reg_val (struct frame_info *frame, unsigned long inst, int carry, |
4235 | unsigned long pc_val, unsigned long status_reg) | |
c906108c SS |
4236 | { |
4237 | unsigned long res, shift; | |
4238 | int rm = bits (inst, 0, 3); | |
4239 | unsigned long shifttype = bits (inst, 5, 6); | |
c5aa993b JM |
4240 | |
4241 | if (bit (inst, 4)) | |
c906108c SS |
4242 | { |
4243 | int rs = bits (inst, 8, 11); | |
0b1b3e42 UW |
4244 | shift = (rs == 15 ? pc_val + 8 |
4245 | : get_frame_register_unsigned (frame, rs)) & 0xFF; | |
c906108c SS |
4246 | } |
4247 | else | |
4248 | shift = bits (inst, 7, 11); | |
c5aa993b | 4249 | |
bf9f652a | 4250 | res = (rm == ARM_PC_REGNUM |
0d39a070 | 4251 | ? (pc_val + (bit (inst, 4) ? 12 : 8)) |
0b1b3e42 | 4252 | : get_frame_register_unsigned (frame, rm)); |
c906108c SS |
4253 | |
4254 | switch (shifttype) | |
4255 | { | |
c5aa993b | 4256 | case 0: /* LSL */ |
c906108c SS |
4257 | res = shift >= 32 ? 0 : res << shift; |
4258 | break; | |
c5aa993b JM |
4259 | |
4260 | case 1: /* LSR */ | |
c906108c SS |
4261 | res = shift >= 32 ? 0 : res >> shift; |
4262 | break; | |
4263 | ||
c5aa993b JM |
4264 | case 2: /* ASR */ |
4265 | if (shift >= 32) | |
4266 | shift = 31; | |
c906108c SS |
4267 | res = ((res & 0x80000000L) |
4268 | ? ~((~res) >> shift) : res >> shift); | |
4269 | break; | |
4270 | ||
c5aa993b | 4271 | case 3: /* ROR/RRX */ |
c906108c SS |
4272 | shift &= 31; |
4273 | if (shift == 0) | |
4274 | res = (res >> 1) | (carry ? 0x80000000L : 0); | |
4275 | else | |
c5aa993b | 4276 | res = (res >> shift) | (res << (32 - shift)); |
c906108c SS |
4277 | break; |
4278 | } | |
4279 | ||
4280 | return res & 0xffffffff; | |
4281 | } | |
4282 | ||
c906108c SS |
4283 | /* Return number of 1-bits in VAL. */ |
4284 | ||
4285 | static int | |
ed9a39eb | 4286 | bitcount (unsigned long val) |
c906108c SS |
4287 | { |
4288 | int nbits; | |
4289 | for (nbits = 0; val != 0; nbits++) | |
0963b4bd | 4290 | val &= val - 1; /* Delete rightmost 1-bit in val. */ |
c906108c SS |
4291 | return nbits; |
4292 | } | |
4293 | ||
177321bd DJ |
4294 | /* Return the size in bytes of the complete Thumb instruction whose |
4295 | first halfword is INST1. */ | |
4296 | ||
4297 | static int | |
4298 | thumb_insn_size (unsigned short inst1) | |
4299 | { | |
4300 | if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0) | |
4301 | return 4; | |
4302 | else | |
4303 | return 2; | |
4304 | } | |
4305 | ||
4306 | static int | |
4307 | thumb_advance_itstate (unsigned int itstate) | |
4308 | { | |
4309 | /* Preserve IT[7:5], the first three bits of the condition. Shift | |
4310 | the upcoming condition flags left by one bit. */ | |
4311 | itstate = (itstate & 0xe0) | ((itstate << 1) & 0x1f); | |
4312 | ||
4313 | /* If we have finished the IT block, clear the state. */ | |
4314 | if ((itstate & 0x0f) == 0) | |
4315 | itstate = 0; | |
4316 | ||
4317 | return itstate; | |
4318 | } | |
4319 | ||
4320 | /* Find the next PC after the current instruction executes. In some | |
4321 | cases we can not statically determine the answer (see the IT state | |
4322 | handling in this function); in that case, a breakpoint may be | |
4323 | inserted in addition to the returned PC, which will be used to set | |
4324 | another breakpoint by our caller. */ | |
4325 | ||
ad527d2e | 4326 | static CORE_ADDR |
18819fa6 | 4327 | thumb_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 4328 | { |
2af46ca0 | 4329 | struct gdbarch *gdbarch = get_frame_arch (frame); |
177321bd | 4330 | struct address_space *aspace = get_frame_address_space (frame); |
e17a4113 UW |
4331 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4332 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
c5aa993b | 4333 | unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */ |
e17a4113 | 4334 | unsigned short inst1; |
0963b4bd | 4335 | CORE_ADDR nextpc = pc + 2; /* Default is next instruction. */ |
c906108c | 4336 | unsigned long offset; |
177321bd | 4337 | ULONGEST status, itstate; |
c906108c | 4338 | |
50e98be4 DJ |
4339 | nextpc = MAKE_THUMB_ADDR (nextpc); |
4340 | pc_val = MAKE_THUMB_ADDR (pc_val); | |
4341 | ||
e17a4113 | 4342 | inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code); |
9d4fde75 | 4343 | |
9dca5578 DJ |
4344 | /* Thumb-2 conditional execution support. There are eight bits in |
4345 | the CPSR which describe conditional execution state. Once | |
4346 | reconstructed (they're in a funny order), the low five bits | |
4347 | describe the low bit of the condition for each instruction and | |
4348 | how many instructions remain. The high three bits describe the | |
4349 | base condition. One of the low four bits will be set if an IT | |
4350 | block is active. These bits read as zero on earlier | |
4351 | processors. */ | |
4352 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
177321bd | 4353 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); |
9dca5578 | 4354 | |
177321bd DJ |
4355 | /* If-Then handling. On GNU/Linux, where this routine is used, we |
4356 | use an undefined instruction as a breakpoint. Unlike BKPT, IT | |
4357 | can disable execution of the undefined instruction. So we might | |
4358 | miss the breakpoint if we set it on a skipped conditional | |
4359 | instruction. Because conditional instructions can change the | |
4360 | flags, affecting the execution of further instructions, we may | |
4361 | need to set two breakpoints. */ | |
9dca5578 | 4362 | |
177321bd DJ |
4363 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint != NULL) |
4364 | { | |
4365 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
4366 | { | |
4367 | /* An IT instruction. Because this instruction does not | |
4368 | modify the flags, we can accurately predict the next | |
4369 | executed instruction. */ | |
4370 | itstate = inst1 & 0x00ff; | |
4371 | pc += thumb_insn_size (inst1); | |
4372 | ||
4373 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) | |
4374 | { | |
0963b4bd MS |
4375 | inst1 = read_memory_unsigned_integer (pc, 2, |
4376 | byte_order_for_code); | |
177321bd DJ |
4377 | pc += thumb_insn_size (inst1); |
4378 | itstate = thumb_advance_itstate (itstate); | |
4379 | } | |
4380 | ||
50e98be4 | 4381 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4382 | } |
4383 | else if (itstate != 0) | |
4384 | { | |
4385 | /* We are in a conditional block. Check the condition. */ | |
4386 | if (! condition_true (itstate >> 4, status)) | |
4387 | { | |
4388 | /* Advance to the next executed instruction. */ | |
4389 | pc += thumb_insn_size (inst1); | |
4390 | itstate = thumb_advance_itstate (itstate); | |
4391 | ||
4392 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) | |
4393 | { | |
0963b4bd MS |
4394 | inst1 = read_memory_unsigned_integer (pc, 2, |
4395 | byte_order_for_code); | |
177321bd DJ |
4396 | pc += thumb_insn_size (inst1); |
4397 | itstate = thumb_advance_itstate (itstate); | |
4398 | } | |
4399 | ||
50e98be4 | 4400 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4401 | } |
4402 | else if ((itstate & 0x0f) == 0x08) | |
4403 | { | |
4404 | /* This is the last instruction of the conditional | |
4405 | block, and it is executed. We can handle it normally | |
4406 | because the following instruction is not conditional, | |
4407 | and we must handle it normally because it is | |
4408 | permitted to branch. Fall through. */ | |
4409 | } | |
4410 | else | |
4411 | { | |
4412 | int cond_negated; | |
4413 | ||
4414 | /* There are conditional instructions after this one. | |
4415 | If this instruction modifies the flags, then we can | |
4416 | not predict what the next executed instruction will | |
4417 | be. Fortunately, this instruction is architecturally | |
4418 | forbidden to branch; we know it will fall through. | |
4419 | Start by skipping past it. */ | |
4420 | pc += thumb_insn_size (inst1); | |
4421 | itstate = thumb_advance_itstate (itstate); | |
4422 | ||
4423 | /* Set a breakpoint on the following instruction. */ | |
4424 | gdb_assert ((itstate & 0x0f) != 0); | |
18819fa6 UW |
4425 | arm_insert_single_step_breakpoint (gdbarch, aspace, |
4426 | MAKE_THUMB_ADDR (pc)); | |
177321bd DJ |
4427 | cond_negated = (itstate >> 4) & 1; |
4428 | ||
4429 | /* Skip all following instructions with the same | |
4430 | condition. If there is a later instruction in the IT | |
4431 | block with the opposite condition, set the other | |
4432 | breakpoint there. If not, then set a breakpoint on | |
4433 | the instruction after the IT block. */ | |
4434 | do | |
4435 | { | |
0963b4bd MS |
4436 | inst1 = read_memory_unsigned_integer (pc, 2, |
4437 | byte_order_for_code); | |
177321bd DJ |
4438 | pc += thumb_insn_size (inst1); |
4439 | itstate = thumb_advance_itstate (itstate); | |
4440 | } | |
4441 | while (itstate != 0 && ((itstate >> 4) & 1) == cond_negated); | |
4442 | ||
50e98be4 | 4443 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4444 | } |
4445 | } | |
4446 | } | |
4447 | else if (itstate & 0x0f) | |
9dca5578 DJ |
4448 | { |
4449 | /* We are in a conditional block. Check the condition. */ | |
177321bd | 4450 | int cond = itstate >> 4; |
9dca5578 DJ |
4451 | |
4452 | if (! condition_true (cond, status)) | |
db24da6d YQ |
4453 | /* Advance to the next instruction. All the 32-bit |
4454 | instructions share a common prefix. */ | |
4455 | return MAKE_THUMB_ADDR (pc + thumb_insn_size (inst1)); | |
177321bd DJ |
4456 | |
4457 | /* Otherwise, handle the instruction normally. */ | |
9dca5578 DJ |
4458 | } |
4459 | ||
c906108c SS |
4460 | if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */ |
4461 | { | |
4462 | CORE_ADDR sp; | |
4463 | ||
4464 | /* Fetch the saved PC from the stack. It's stored above | |
4465 | all of the other registers. */ | |
f0c9063c | 4466 | offset = bitcount (bits (inst1, 0, 7)) * INT_REGISTER_SIZE; |
0b1b3e42 | 4467 | sp = get_frame_register_unsigned (frame, ARM_SP_REGNUM); |
e17a4113 | 4468 | nextpc = read_memory_unsigned_integer (sp + offset, 4, byte_order); |
c906108c SS |
4469 | } |
4470 | else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */ | |
4471 | { | |
c5aa993b | 4472 | unsigned long cond = bits (inst1, 8, 11); |
25b41d01 YQ |
4473 | if (cond == 0x0f) /* 0x0f = SWI */ |
4474 | { | |
4475 | struct gdbarch_tdep *tdep; | |
4476 | tdep = gdbarch_tdep (gdbarch); | |
4477 | ||
4478 | if (tdep->syscall_next_pc != NULL) | |
4479 | nextpc = tdep->syscall_next_pc (frame); | |
4480 | ||
4481 | } | |
4482 | else if (cond != 0x0f && condition_true (cond, status)) | |
c906108c SS |
4483 | nextpc = pc_val + (sbits (inst1, 0, 7) << 1); |
4484 | } | |
4485 | else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */ | |
4486 | { | |
4487 | nextpc = pc_val + (sbits (inst1, 0, 10) << 1); | |
4488 | } | |
db24da6d | 4489 | else if (thumb_insn_size (inst1) == 4) /* 32-bit instruction */ |
c906108c | 4490 | { |
e17a4113 UW |
4491 | unsigned short inst2; |
4492 | inst2 = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); | |
9dca5578 DJ |
4493 | |
4494 | /* Default to the next instruction. */ | |
4495 | nextpc = pc + 4; | |
50e98be4 | 4496 | nextpc = MAKE_THUMB_ADDR (nextpc); |
9dca5578 DJ |
4497 | |
4498 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) | |
4499 | { | |
4500 | /* Branches and miscellaneous control instructions. */ | |
4501 | ||
4502 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) | |
4503 | { | |
4504 | /* B, BL, BLX. */ | |
4505 | int j1, j2, imm1, imm2; | |
4506 | ||
4507 | imm1 = sbits (inst1, 0, 10); | |
4508 | imm2 = bits (inst2, 0, 10); | |
4509 | j1 = bit (inst2, 13); | |
4510 | j2 = bit (inst2, 11); | |
4511 | ||
4512 | offset = ((imm1 << 12) + (imm2 << 1)); | |
4513 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
4514 | ||
4515 | nextpc = pc_val + offset; | |
4516 | /* For BLX make sure to clear the low bits. */ | |
4517 | if (bit (inst2, 12) == 0) | |
4518 | nextpc = nextpc & 0xfffffffc; | |
4519 | } | |
4520 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) | |
4521 | { | |
4522 | /* SUBS PC, LR, #imm8. */ | |
4523 | nextpc = get_frame_register_unsigned (frame, ARM_LR_REGNUM); | |
4524 | nextpc -= inst2 & 0x00ff; | |
4525 | } | |
4069ebbe | 4526 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) |
9dca5578 DJ |
4527 | { |
4528 | /* Conditional branch. */ | |
4529 | if (condition_true (bits (inst1, 6, 9), status)) | |
4530 | { | |
4531 | int sign, j1, j2, imm1, imm2; | |
4532 | ||
4533 | sign = sbits (inst1, 10, 10); | |
4534 | imm1 = bits (inst1, 0, 5); | |
4535 | imm2 = bits (inst2, 0, 10); | |
4536 | j1 = bit (inst2, 13); | |
4537 | j2 = bit (inst2, 11); | |
4538 | ||
4539 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); | |
4540 | offset += (imm1 << 12) + (imm2 << 1); | |
4541 | ||
4542 | nextpc = pc_val + offset; | |
4543 | } | |
4544 | } | |
4545 | } | |
4546 | else if ((inst1 & 0xfe50) == 0xe810) | |
4547 | { | |
4548 | /* Load multiple or RFE. */ | |
4549 | int rn, offset, load_pc = 1; | |
4550 | ||
4551 | rn = bits (inst1, 0, 3); | |
4552 | if (bit (inst1, 7) && !bit (inst1, 8)) | |
4553 | { | |
4554 | /* LDMIA or POP */ | |
4555 | if (!bit (inst2, 15)) | |
4556 | load_pc = 0; | |
4557 | offset = bitcount (inst2) * 4 - 4; | |
4558 | } | |
4559 | else if (!bit (inst1, 7) && bit (inst1, 8)) | |
4560 | { | |
4561 | /* LDMDB */ | |
4562 | if (!bit (inst2, 15)) | |
4563 | load_pc = 0; | |
4564 | offset = -4; | |
4565 | } | |
4566 | else if (bit (inst1, 7) && bit (inst1, 8)) | |
4567 | { | |
4568 | /* RFEIA */ | |
4569 | offset = 0; | |
4570 | } | |
4571 | else if (!bit (inst1, 7) && !bit (inst1, 8)) | |
4572 | { | |
4573 | /* RFEDB */ | |
4574 | offset = -8; | |
4575 | } | |
4576 | else | |
4577 | load_pc = 0; | |
4578 | ||
4579 | if (load_pc) | |
4580 | { | |
4581 | CORE_ADDR addr = get_frame_register_unsigned (frame, rn); | |
4582 | nextpc = get_frame_memory_unsigned (frame, addr + offset, 4); | |
4583 | } | |
4584 | } | |
4585 | else if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) | |
4586 | { | |
4587 | /* MOV PC or MOVS PC. */ | |
4588 | nextpc = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); | |
50e98be4 | 4589 | nextpc = MAKE_THUMB_ADDR (nextpc); |
9dca5578 DJ |
4590 | } |
4591 | else if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) | |
4592 | { | |
4593 | /* LDR PC. */ | |
4594 | CORE_ADDR base; | |
4595 | int rn, load_pc = 1; | |
4596 | ||
4597 | rn = bits (inst1, 0, 3); | |
4598 | base = get_frame_register_unsigned (frame, rn); | |
bf9f652a | 4599 | if (rn == ARM_PC_REGNUM) |
9dca5578 DJ |
4600 | { |
4601 | base = (base + 4) & ~(CORE_ADDR) 0x3; | |
4602 | if (bit (inst1, 7)) | |
4603 | base += bits (inst2, 0, 11); | |
4604 | else | |
4605 | base -= bits (inst2, 0, 11); | |
4606 | } | |
4607 | else if (bit (inst1, 7)) | |
4608 | base += bits (inst2, 0, 11); | |
4609 | else if (bit (inst2, 11)) | |
4610 | { | |
4611 | if (bit (inst2, 10)) | |
4612 | { | |
4613 | if (bit (inst2, 9)) | |
4614 | base += bits (inst2, 0, 7); | |
4615 | else | |
4616 | base -= bits (inst2, 0, 7); | |
4617 | } | |
4618 | } | |
4619 | else if ((inst2 & 0x0fc0) == 0x0000) | |
4620 | { | |
4621 | int shift = bits (inst2, 4, 5), rm = bits (inst2, 0, 3); | |
4622 | base += get_frame_register_unsigned (frame, rm) << shift; | |
4623 | } | |
4624 | else | |
4625 | /* Reserved. */ | |
4626 | load_pc = 0; | |
4627 | ||
4628 | if (load_pc) | |
4629 | nextpc = get_frame_memory_unsigned (frame, base, 4); | |
4630 | } | |
4631 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) | |
4632 | { | |
4633 | /* TBB. */ | |
d476da0e RE |
4634 | CORE_ADDR tbl_reg, table, offset, length; |
4635 | ||
4636 | tbl_reg = bits (inst1, 0, 3); | |
4637 | if (tbl_reg == 0x0f) | |
4638 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ | |
4639 | else | |
4640 | table = get_frame_register_unsigned (frame, tbl_reg); | |
9dca5578 | 4641 | |
9dca5578 DJ |
4642 | offset = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
4643 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 1); | |
4644 | nextpc = pc_val + length; | |
4645 | } | |
d476da0e | 4646 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) |
9dca5578 DJ |
4647 | { |
4648 | /* TBH. */ | |
d476da0e RE |
4649 | CORE_ADDR tbl_reg, table, offset, length; |
4650 | ||
4651 | tbl_reg = bits (inst1, 0, 3); | |
4652 | if (tbl_reg == 0x0f) | |
4653 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ | |
4654 | else | |
4655 | table = get_frame_register_unsigned (frame, tbl_reg); | |
9dca5578 | 4656 | |
9dca5578 DJ |
4657 | offset = 2 * get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
4658 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 2); | |
4659 | nextpc = pc_val + length; | |
4660 | } | |
c906108c | 4661 | } |
aa17d93e | 4662 | else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */ |
9498281f DJ |
4663 | { |
4664 | if (bits (inst1, 3, 6) == 0x0f) | |
6ca1b147 | 4665 | nextpc = UNMAKE_THUMB_ADDR (pc_val); |
9498281f | 4666 | else |
0b1b3e42 | 4667 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); |
9498281f | 4668 | } |
ad8b5167 UW |
4669 | else if ((inst1 & 0xff87) == 0x4687) /* mov pc, REG */ |
4670 | { | |
4671 | if (bits (inst1, 3, 6) == 0x0f) | |
4672 | nextpc = pc_val; | |
4673 | else | |
4674 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); | |
4675 | ||
4676 | nextpc = MAKE_THUMB_ADDR (nextpc); | |
4677 | } | |
9dca5578 DJ |
4678 | else if ((inst1 & 0xf500) == 0xb100) |
4679 | { | |
4680 | /* CBNZ or CBZ. */ | |
4681 | int imm = (bit (inst1, 9) << 6) + (bits (inst1, 3, 7) << 1); | |
4682 | ULONGEST reg = get_frame_register_unsigned (frame, bits (inst1, 0, 2)); | |
4683 | ||
4684 | if (bit (inst1, 11) && reg != 0) | |
4685 | nextpc = pc_val + imm; | |
4686 | else if (!bit (inst1, 11) && reg == 0) | |
4687 | nextpc = pc_val + imm; | |
4688 | } | |
c906108c SS |
4689 | return nextpc; |
4690 | } | |
4691 | ||
50e98be4 | 4692 | /* Get the raw next address. PC is the current program counter, in |
18819fa6 | 4693 | FRAME, which is assumed to be executing in ARM mode. |
50e98be4 DJ |
4694 | |
4695 | The value returned has the execution state of the next instruction | |
4696 | encoded in it. Use IS_THUMB_ADDR () to see whether the instruction is | |
4697 | in Thumb-State, and gdbarch_addr_bits_remove () to get the plain memory | |
0963b4bd MS |
4698 | address. */ |
4699 | ||
50e98be4 | 4700 | static CORE_ADDR |
18819fa6 | 4701 | arm_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 4702 | { |
2af46ca0 | 4703 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
4704 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4705 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
c906108c SS |
4706 | unsigned long pc_val; |
4707 | unsigned long this_instr; | |
4708 | unsigned long status; | |
4709 | CORE_ADDR nextpc; | |
4710 | ||
c906108c | 4711 | pc_val = (unsigned long) pc; |
e17a4113 | 4712 | this_instr = read_memory_unsigned_integer (pc, 4, byte_order_for_code); |
9d4fde75 | 4713 | |
0b1b3e42 | 4714 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); |
c5aa993b | 4715 | nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */ |
c906108c | 4716 | |
daddc3c1 DJ |
4717 | if (bits (this_instr, 28, 31) == INST_NV) |
4718 | switch (bits (this_instr, 24, 27)) | |
4719 | { | |
4720 | case 0xa: | |
4721 | case 0xb: | |
4722 | { | |
4723 | /* Branch with Link and change to Thumb. */ | |
4724 | nextpc = BranchDest (pc, this_instr); | |
4725 | nextpc |= bit (this_instr, 24) << 1; | |
50e98be4 | 4726 | nextpc = MAKE_THUMB_ADDR (nextpc); |
daddc3c1 DJ |
4727 | break; |
4728 | } | |
4729 | case 0xc: | |
4730 | case 0xd: | |
4731 | case 0xe: | |
4732 | /* Coprocessor register transfer. */ | |
4733 | if (bits (this_instr, 12, 15) == 15) | |
4734 | error (_("Invalid update to pc in instruction")); | |
4735 | break; | |
4736 | } | |
4737 | else if (condition_true (bits (this_instr, 28, 31), status)) | |
c906108c SS |
4738 | { |
4739 | switch (bits (this_instr, 24, 27)) | |
4740 | { | |
c5aa993b | 4741 | case 0x0: |
94c30b78 | 4742 | case 0x1: /* data processing */ |
c5aa993b JM |
4743 | case 0x2: |
4744 | case 0x3: | |
c906108c SS |
4745 | { |
4746 | unsigned long operand1, operand2, result = 0; | |
4747 | unsigned long rn; | |
4748 | int c; | |
c5aa993b | 4749 | |
c906108c SS |
4750 | if (bits (this_instr, 12, 15) != 15) |
4751 | break; | |
4752 | ||
4753 | if (bits (this_instr, 22, 25) == 0 | |
c5aa993b | 4754 | && bits (this_instr, 4, 7) == 9) /* multiply */ |
edefbb7c | 4755 | error (_("Invalid update to pc in instruction")); |
c906108c | 4756 | |
9498281f | 4757 | /* BX <reg>, BLX <reg> */ |
e150acc7 PB |
4758 | if (bits (this_instr, 4, 27) == 0x12fff1 |
4759 | || bits (this_instr, 4, 27) == 0x12fff3) | |
9498281f DJ |
4760 | { |
4761 | rn = bits (this_instr, 0, 3); | |
bf9f652a YQ |
4762 | nextpc = ((rn == ARM_PC_REGNUM) |
4763 | ? (pc_val + 8) | |
4764 | : get_frame_register_unsigned (frame, rn)); | |
4765 | ||
9498281f DJ |
4766 | return nextpc; |
4767 | } | |
4768 | ||
0963b4bd | 4769 | /* Multiply into PC. */ |
c906108c SS |
4770 | c = (status & FLAG_C) ? 1 : 0; |
4771 | rn = bits (this_instr, 16, 19); | |
bf9f652a YQ |
4772 | operand1 = ((rn == ARM_PC_REGNUM) |
4773 | ? (pc_val + 8) | |
4774 | : get_frame_register_unsigned (frame, rn)); | |
c5aa993b | 4775 | |
c906108c SS |
4776 | if (bit (this_instr, 25)) |
4777 | { | |
4778 | unsigned long immval = bits (this_instr, 0, 7); | |
4779 | unsigned long rotate = 2 * bits (this_instr, 8, 11); | |
c5aa993b JM |
4780 | operand2 = ((immval >> rotate) | (immval << (32 - rotate))) |
4781 | & 0xffffffff; | |
c906108c | 4782 | } |
0963b4bd MS |
4783 | else /* operand 2 is a shifted register. */ |
4784 | operand2 = shifted_reg_val (frame, this_instr, c, | |
4785 | pc_val, status); | |
c5aa993b | 4786 | |
c906108c SS |
4787 | switch (bits (this_instr, 21, 24)) |
4788 | { | |
c5aa993b | 4789 | case 0x0: /*and */ |
c906108c SS |
4790 | result = operand1 & operand2; |
4791 | break; | |
4792 | ||
c5aa993b | 4793 | case 0x1: /*eor */ |
c906108c SS |
4794 | result = operand1 ^ operand2; |
4795 | break; | |
4796 | ||
c5aa993b | 4797 | case 0x2: /*sub */ |
c906108c SS |
4798 | result = operand1 - operand2; |
4799 | break; | |
4800 | ||
c5aa993b | 4801 | case 0x3: /*rsb */ |
c906108c SS |
4802 | result = operand2 - operand1; |
4803 | break; | |
4804 | ||
c5aa993b | 4805 | case 0x4: /*add */ |
c906108c SS |
4806 | result = operand1 + operand2; |
4807 | break; | |
4808 | ||
c5aa993b | 4809 | case 0x5: /*adc */ |
c906108c SS |
4810 | result = operand1 + operand2 + c; |
4811 | break; | |
4812 | ||
c5aa993b | 4813 | case 0x6: /*sbc */ |
c906108c SS |
4814 | result = operand1 - operand2 + c; |
4815 | break; | |
4816 | ||
c5aa993b | 4817 | case 0x7: /*rsc */ |
c906108c SS |
4818 | result = operand2 - operand1 + c; |
4819 | break; | |
4820 | ||
c5aa993b JM |
4821 | case 0x8: |
4822 | case 0x9: | |
4823 | case 0xa: | |
4824 | case 0xb: /* tst, teq, cmp, cmn */ | |
c906108c SS |
4825 | result = (unsigned long) nextpc; |
4826 | break; | |
4827 | ||
c5aa993b | 4828 | case 0xc: /*orr */ |
c906108c SS |
4829 | result = operand1 | operand2; |
4830 | break; | |
4831 | ||
c5aa993b | 4832 | case 0xd: /*mov */ |
c906108c SS |
4833 | /* Always step into a function. */ |
4834 | result = operand2; | |
c5aa993b | 4835 | break; |
c906108c | 4836 | |
c5aa993b | 4837 | case 0xe: /*bic */ |
c906108c SS |
4838 | result = operand1 & ~operand2; |
4839 | break; | |
4840 | ||
c5aa993b | 4841 | case 0xf: /*mvn */ |
c906108c SS |
4842 | result = ~operand2; |
4843 | break; | |
4844 | } | |
c906108c | 4845 | |
50e98be4 DJ |
4846 | /* In 26-bit APCS the bottom two bits of the result are |
4847 | ignored, and we always end up in ARM state. */ | |
4848 | if (!arm_apcs_32) | |
4849 | nextpc = arm_addr_bits_remove (gdbarch, result); | |
4850 | else | |
4851 | nextpc = result; | |
4852 | ||
c906108c SS |
4853 | break; |
4854 | } | |
c5aa993b JM |
4855 | |
4856 | case 0x4: | |
4857 | case 0x5: /* data transfer */ | |
4858 | case 0x6: | |
4859 | case 0x7: | |
c906108c SS |
4860 | if (bit (this_instr, 20)) |
4861 | { | |
4862 | /* load */ | |
4863 | if (bits (this_instr, 12, 15) == 15) | |
4864 | { | |
4865 | /* rd == pc */ | |
c5aa993b | 4866 | unsigned long rn; |
c906108c | 4867 | unsigned long base; |
c5aa993b | 4868 | |
c906108c | 4869 | if (bit (this_instr, 22)) |
edefbb7c | 4870 | error (_("Invalid update to pc in instruction")); |
c906108c SS |
4871 | |
4872 | /* byte write to PC */ | |
4873 | rn = bits (this_instr, 16, 19); | |
bf9f652a YQ |
4874 | base = ((rn == ARM_PC_REGNUM) |
4875 | ? (pc_val + 8) | |
4876 | : get_frame_register_unsigned (frame, rn)); | |
4877 | ||
c906108c SS |
4878 | if (bit (this_instr, 24)) |
4879 | { | |
4880 | /* pre-indexed */ | |
4881 | int c = (status & FLAG_C) ? 1 : 0; | |
4882 | unsigned long offset = | |
c5aa993b | 4883 | (bit (this_instr, 25) |
0b1b3e42 | 4884 | ? shifted_reg_val (frame, this_instr, c, pc_val, status) |
c5aa993b | 4885 | : bits (this_instr, 0, 11)); |
c906108c SS |
4886 | |
4887 | if (bit (this_instr, 23)) | |
4888 | base += offset; | |
4889 | else | |
4890 | base -= offset; | |
4891 | } | |
51370a33 YQ |
4892 | nextpc = |
4893 | (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) base, | |
4894 | 4, byte_order); | |
c906108c SS |
4895 | } |
4896 | } | |
4897 | break; | |
c5aa993b JM |
4898 | |
4899 | case 0x8: | |
4900 | case 0x9: /* block transfer */ | |
c906108c SS |
4901 | if (bit (this_instr, 20)) |
4902 | { | |
4903 | /* LDM */ | |
4904 | if (bit (this_instr, 15)) | |
4905 | { | |
4906 | /* loading pc */ | |
4907 | int offset = 0; | |
51370a33 YQ |
4908 | unsigned long rn_val |
4909 | = get_frame_register_unsigned (frame, | |
4910 | bits (this_instr, 16, 19)); | |
c906108c SS |
4911 | |
4912 | if (bit (this_instr, 23)) | |
4913 | { | |
4914 | /* up */ | |
4915 | unsigned long reglist = bits (this_instr, 0, 14); | |
4916 | offset = bitcount (reglist) * 4; | |
c5aa993b | 4917 | if (bit (this_instr, 24)) /* pre */ |
c906108c SS |
4918 | offset += 4; |
4919 | } | |
4920 | else if (bit (this_instr, 24)) | |
4921 | offset = -4; | |
c5aa993b | 4922 | |
51370a33 YQ |
4923 | nextpc = |
4924 | (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) | |
4925 | (rn_val + offset), | |
4926 | 4, byte_order); | |
c906108c SS |
4927 | } |
4928 | } | |
4929 | break; | |
c5aa993b JM |
4930 | |
4931 | case 0xb: /* branch & link */ | |
4932 | case 0xa: /* branch */ | |
c906108c SS |
4933 | { |
4934 | nextpc = BranchDest (pc, this_instr); | |
c906108c SS |
4935 | break; |
4936 | } | |
c5aa993b JM |
4937 | |
4938 | case 0xc: | |
4939 | case 0xd: | |
4940 | case 0xe: /* coproc ops */ | |
25b41d01 | 4941 | break; |
c5aa993b | 4942 | case 0xf: /* SWI */ |
25b41d01 YQ |
4943 | { |
4944 | struct gdbarch_tdep *tdep; | |
4945 | tdep = gdbarch_tdep (gdbarch); | |
4946 | ||
4947 | if (tdep->syscall_next_pc != NULL) | |
4948 | nextpc = tdep->syscall_next_pc (frame); | |
4949 | ||
4950 | } | |
c906108c SS |
4951 | break; |
4952 | ||
4953 | default: | |
edefbb7c | 4954 | fprintf_filtered (gdb_stderr, _("Bad bit-field extraction\n")); |
c906108c SS |
4955 | return (pc); |
4956 | } | |
4957 | } | |
4958 | ||
4959 | return nextpc; | |
4960 | } | |
4961 | ||
18819fa6 UW |
4962 | /* Determine next PC after current instruction executes. Will call either |
4963 | arm_get_next_pc_raw or thumb_get_next_pc_raw. Error out if infinite | |
4964 | loop is detected. */ | |
4965 | ||
50e98be4 DJ |
4966 | CORE_ADDR |
4967 | arm_get_next_pc (struct frame_info *frame, CORE_ADDR pc) | |
4968 | { | |
18819fa6 UW |
4969 | CORE_ADDR nextpc; |
4970 | ||
4971 | if (arm_frame_is_thumb (frame)) | |
4972 | { | |
4973 | nextpc = thumb_get_next_pc_raw (frame, pc); | |
4974 | if (nextpc == MAKE_THUMB_ADDR (pc)) | |
4975 | error (_("Infinite loop detected")); | |
4976 | } | |
4977 | else | |
4978 | { | |
4979 | nextpc = arm_get_next_pc_raw (frame, pc); | |
4980 | if (nextpc == pc) | |
4981 | error (_("Infinite loop detected")); | |
4982 | } | |
4983 | ||
50e98be4 DJ |
4984 | return nextpc; |
4985 | } | |
4986 | ||
18819fa6 UW |
4987 | /* Like insert_single_step_breakpoint, but make sure we use a breakpoint |
4988 | of the appropriate mode (as encoded in the PC value), even if this | |
4989 | differs from what would be expected according to the symbol tables. */ | |
4990 | ||
4991 | void | |
4992 | arm_insert_single_step_breakpoint (struct gdbarch *gdbarch, | |
4993 | struct address_space *aspace, | |
4994 | CORE_ADDR pc) | |
4995 | { | |
4996 | struct cleanup *old_chain | |
4997 | = make_cleanup_restore_integer (&arm_override_mode); | |
4998 | ||
4999 | arm_override_mode = IS_THUMB_ADDR (pc); | |
5000 | pc = gdbarch_addr_bits_remove (gdbarch, pc); | |
5001 | ||
5002 | insert_single_step_breakpoint (gdbarch, aspace, pc); | |
5003 | ||
5004 | do_cleanups (old_chain); | |
5005 | } | |
5006 | ||
35f73cfc UW |
5007 | /* Checks for an atomic sequence of instructions beginning with a LDREX{,B,H,D} |
5008 | instruction and ending with a STREX{,B,H,D} instruction. If such a sequence | |
5009 | is found, attempt to step through it. A breakpoint is placed at the end of | |
5010 | the sequence. */ | |
5011 | ||
5012 | static int | |
5013 | thumb_deal_with_atomic_sequence_raw (struct frame_info *frame) | |
5014 | { | |
5015 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
5016 | struct address_space *aspace = get_frame_address_space (frame); | |
5017 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
5018 | CORE_ADDR pc = get_frame_pc (frame); | |
5019 | CORE_ADDR breaks[2] = {-1, -1}; | |
5020 | CORE_ADDR loc = pc; | |
5021 | unsigned short insn1, insn2; | |
5022 | int insn_count; | |
5023 | int index; | |
5024 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ | |
5025 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ | |
5026 | ULONGEST status, itstate; | |
5027 | ||
5028 | /* We currently do not support atomic sequences within an IT block. */ | |
5029 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
5030 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); | |
5031 | if (itstate & 0x0f) | |
5032 | return 0; | |
5033 | ||
5034 | /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. */ | |
5035 | insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5036 | loc += 2; | |
5037 | if (thumb_insn_size (insn1) != 4) | |
5038 | return 0; | |
5039 | ||
5040 | insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5041 | loc += 2; | |
5042 | if (!((insn1 & 0xfff0) == 0xe850 | |
5043 | || ((insn1 & 0xfff0) == 0xe8d0 && (insn2 & 0x00c0) == 0x0040))) | |
5044 | return 0; | |
5045 | ||
5046 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" | |
5047 | instructions. */ | |
5048 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) | |
5049 | { | |
5050 | insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5051 | loc += 2; | |
5052 | ||
5053 | if (thumb_insn_size (insn1) != 4) | |
5054 | { | |
5055 | /* Assume that there is at most one conditional branch in the | |
5056 | atomic sequence. If a conditional branch is found, put a | |
5057 | breakpoint in its destination address. */ | |
5058 | if ((insn1 & 0xf000) == 0xd000 && bits (insn1, 8, 11) != 0x0f) | |
5059 | { | |
5060 | if (last_breakpoint > 0) | |
5061 | return 0; /* More than one conditional branch found, | |
5062 | fallback to the standard code. */ | |
5063 | ||
5064 | breaks[1] = loc + 2 + (sbits (insn1, 0, 7) << 1); | |
5065 | last_breakpoint++; | |
5066 | } | |
5067 | ||
5068 | /* We do not support atomic sequences that use any *other* | |
5069 | instructions but conditional branches to change the PC. | |
5070 | Fall back to standard code to avoid losing control of | |
5071 | execution. */ | |
5072 | else if (thumb_instruction_changes_pc (insn1)) | |
5073 | return 0; | |
5074 | } | |
5075 | else | |
5076 | { | |
5077 | insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5078 | loc += 2; | |
5079 | ||
5080 | /* Assume that there is at most one conditional branch in the | |
5081 | atomic sequence. If a conditional branch is found, put a | |
5082 | breakpoint in its destination address. */ | |
5083 | if ((insn1 & 0xf800) == 0xf000 | |
5084 | && (insn2 & 0xd000) == 0x8000 | |
5085 | && (insn1 & 0x0380) != 0x0380) | |
5086 | { | |
5087 | int sign, j1, j2, imm1, imm2; | |
5088 | unsigned int offset; | |
5089 | ||
5090 | sign = sbits (insn1, 10, 10); | |
5091 | imm1 = bits (insn1, 0, 5); | |
5092 | imm2 = bits (insn2, 0, 10); | |
5093 | j1 = bit (insn2, 13); | |
5094 | j2 = bit (insn2, 11); | |
5095 | ||
5096 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); | |
5097 | offset += (imm1 << 12) + (imm2 << 1); | |
5098 | ||
5099 | if (last_breakpoint > 0) | |
5100 | return 0; /* More than one conditional branch found, | |
5101 | fallback to the standard code. */ | |
5102 | ||
5103 | breaks[1] = loc + offset; | |
5104 | last_breakpoint++; | |
5105 | } | |
5106 | ||
5107 | /* We do not support atomic sequences that use any *other* | |
5108 | instructions but conditional branches to change the PC. | |
5109 | Fall back to standard code to avoid losing control of | |
5110 | execution. */ | |
5111 | else if (thumb2_instruction_changes_pc (insn1, insn2)) | |
5112 | return 0; | |
5113 | ||
5114 | /* If we find a strex{,b,h,d}, we're done. */ | |
5115 | if ((insn1 & 0xfff0) == 0xe840 | |
5116 | || ((insn1 & 0xfff0) == 0xe8c0 && (insn2 & 0x00c0) == 0x0040)) | |
5117 | break; | |
5118 | } | |
5119 | } | |
5120 | ||
5121 | /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */ | |
5122 | if (insn_count == atomic_sequence_length) | |
5123 | return 0; | |
5124 | ||
5125 | /* Insert a breakpoint right after the end of the atomic sequence. */ | |
5126 | breaks[0] = loc; | |
5127 | ||
5128 | /* Check for duplicated breakpoints. Check also for a breakpoint | |
5129 | placed (branch instruction's destination) anywhere in sequence. */ | |
5130 | if (last_breakpoint | |
5131 | && (breaks[1] == breaks[0] | |
5132 | || (breaks[1] >= pc && breaks[1] < loc))) | |
5133 | last_breakpoint = 0; | |
5134 | ||
5135 | /* Effectively inserts the breakpoints. */ | |
5136 | for (index = 0; index <= last_breakpoint; index++) | |
5137 | arm_insert_single_step_breakpoint (gdbarch, aspace, | |
5138 | MAKE_THUMB_ADDR (breaks[index])); | |
5139 | ||
5140 | return 1; | |
5141 | } | |
5142 | ||
5143 | static int | |
5144 | arm_deal_with_atomic_sequence_raw (struct frame_info *frame) | |
5145 | { | |
5146 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
5147 | struct address_space *aspace = get_frame_address_space (frame); | |
5148 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
5149 | CORE_ADDR pc = get_frame_pc (frame); | |
5150 | CORE_ADDR breaks[2] = {-1, -1}; | |
5151 | CORE_ADDR loc = pc; | |
5152 | unsigned int insn; | |
5153 | int insn_count; | |
5154 | int index; | |
5155 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ | |
5156 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ | |
5157 | ||
5158 | /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. | |
5159 | Note that we do not currently support conditionally executed atomic | |
5160 | instructions. */ | |
5161 | insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code); | |
5162 | loc += 4; | |
5163 | if ((insn & 0xff9000f0) != 0xe1900090) | |
5164 | return 0; | |
5165 | ||
5166 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" | |
5167 | instructions. */ | |
5168 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) | |
5169 | { | |
5170 | insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code); | |
5171 | loc += 4; | |
5172 | ||
5173 | /* Assume that there is at most one conditional branch in the atomic | |
5174 | sequence. If a conditional branch is found, put a breakpoint in | |
5175 | its destination address. */ | |
5176 | if (bits (insn, 24, 27) == 0xa) | |
5177 | { | |
5178 | if (last_breakpoint > 0) | |
5179 | return 0; /* More than one conditional branch found, fallback | |
5180 | to the standard single-step code. */ | |
5181 | ||
5182 | breaks[1] = BranchDest (loc - 4, insn); | |
5183 | last_breakpoint++; | |
5184 | } | |
5185 | ||
5186 | /* We do not support atomic sequences that use any *other* instructions | |
5187 | but conditional branches to change the PC. Fall back to standard | |
5188 | code to avoid losing control of execution. */ | |
5189 | else if (arm_instruction_changes_pc (insn)) | |
5190 | return 0; | |
5191 | ||
5192 | /* If we find a strex{,b,h,d}, we're done. */ | |
5193 | if ((insn & 0xff9000f0) == 0xe1800090) | |
5194 | break; | |
5195 | } | |
5196 | ||
5197 | /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */ | |
5198 | if (insn_count == atomic_sequence_length) | |
5199 | return 0; | |
5200 | ||
5201 | /* Insert a breakpoint right after the end of the atomic sequence. */ | |
5202 | breaks[0] = loc; | |
5203 | ||
5204 | /* Check for duplicated breakpoints. Check also for a breakpoint | |
5205 | placed (branch instruction's destination) anywhere in sequence. */ | |
5206 | if (last_breakpoint | |
5207 | && (breaks[1] == breaks[0] | |
5208 | || (breaks[1] >= pc && breaks[1] < loc))) | |
5209 | last_breakpoint = 0; | |
5210 | ||
5211 | /* Effectively inserts the breakpoints. */ | |
5212 | for (index = 0; index <= last_breakpoint; index++) | |
5213 | arm_insert_single_step_breakpoint (gdbarch, aspace, breaks[index]); | |
5214 | ||
5215 | return 1; | |
5216 | } | |
5217 | ||
5218 | int | |
5219 | arm_deal_with_atomic_sequence (struct frame_info *frame) | |
5220 | { | |
5221 | if (arm_frame_is_thumb (frame)) | |
5222 | return thumb_deal_with_atomic_sequence_raw (frame); | |
5223 | else | |
5224 | return arm_deal_with_atomic_sequence_raw (frame); | |
5225 | } | |
5226 | ||
9512d7fd FN |
5227 | /* single_step() is called just before we want to resume the inferior, |
5228 | if we want to single-step it but there is no hardware or kernel | |
5229 | single-step support. We find the target of the coming instruction | |
e0cd558a | 5230 | and breakpoint it. */ |
9512d7fd | 5231 | |
190dce09 | 5232 | int |
0b1b3e42 | 5233 | arm_software_single_step (struct frame_info *frame) |
9512d7fd | 5234 | { |
a6d9a66e | 5235 | struct gdbarch *gdbarch = get_frame_arch (frame); |
6c95b8df | 5236 | struct address_space *aspace = get_frame_address_space (frame); |
35f73cfc UW |
5237 | CORE_ADDR next_pc; |
5238 | ||
5239 | if (arm_deal_with_atomic_sequence (frame)) | |
5240 | return 1; | |
18819fa6 | 5241 | |
35f73cfc | 5242 | next_pc = arm_get_next_pc (frame, get_frame_pc (frame)); |
18819fa6 | 5243 | arm_insert_single_step_breakpoint (gdbarch, aspace, next_pc); |
e6590a1b UW |
5244 | |
5245 | return 1; | |
9512d7fd | 5246 | } |
9512d7fd | 5247 | |
f9d67f43 DJ |
5248 | /* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand |
5249 | the buffer to be NEW_LEN bytes ending at ENDADDR. Return | |
5250 | NULL if an error occurs. BUF is freed. */ | |
5251 | ||
5252 | static gdb_byte * | |
5253 | extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr, | |
5254 | int old_len, int new_len) | |
5255 | { | |
22e048c9 | 5256 | gdb_byte *new_buf; |
f9d67f43 DJ |
5257 | int bytes_to_read = new_len - old_len; |
5258 | ||
5259 | new_buf = xmalloc (new_len); | |
5260 | memcpy (new_buf + bytes_to_read, buf, old_len); | |
5261 | xfree (buf); | |
5262 | if (target_read_memory (endaddr - new_len, new_buf, bytes_to_read) != 0) | |
5263 | { | |
5264 | xfree (new_buf); | |
5265 | return NULL; | |
5266 | } | |
5267 | return new_buf; | |
5268 | } | |
5269 | ||
5270 | /* An IT block is at most the 2-byte IT instruction followed by | |
5271 | four 4-byte instructions. The furthest back we must search to | |
5272 | find an IT block that affects the current instruction is thus | |
5273 | 2 + 3 * 4 == 14 bytes. */ | |
5274 | #define MAX_IT_BLOCK_PREFIX 14 | |
5275 | ||
5276 | /* Use a quick scan if there are more than this many bytes of | |
5277 | code. */ | |
5278 | #define IT_SCAN_THRESHOLD 32 | |
5279 | ||
5280 | /* Adjust a breakpoint's address to move breakpoints out of IT blocks. | |
5281 | A breakpoint in an IT block may not be hit, depending on the | |
5282 | condition flags. */ | |
5283 | static CORE_ADDR | |
5284 | arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr) | |
5285 | { | |
5286 | gdb_byte *buf; | |
5287 | char map_type; | |
5288 | CORE_ADDR boundary, func_start; | |
22e048c9 | 5289 | int buf_len; |
f9d67f43 DJ |
5290 | enum bfd_endian order = gdbarch_byte_order_for_code (gdbarch); |
5291 | int i, any, last_it, last_it_count; | |
5292 | ||
5293 | /* If we are using BKPT breakpoints, none of this is necessary. */ | |
5294 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint == NULL) | |
5295 | return bpaddr; | |
5296 | ||
5297 | /* ARM mode does not have this problem. */ | |
9779414d | 5298 | if (!arm_pc_is_thumb (gdbarch, bpaddr)) |
f9d67f43 DJ |
5299 | return bpaddr; |
5300 | ||
5301 | /* We are setting a breakpoint in Thumb code that could potentially | |
5302 | contain an IT block. The first step is to find how much Thumb | |
5303 | code there is; we do not need to read outside of known Thumb | |
5304 | sequences. */ | |
5305 | map_type = arm_find_mapping_symbol (bpaddr, &boundary); | |
5306 | if (map_type == 0) | |
5307 | /* Thumb-2 code must have mapping symbols to have a chance. */ | |
5308 | return bpaddr; | |
5309 | ||
5310 | bpaddr = gdbarch_addr_bits_remove (gdbarch, bpaddr); | |
5311 | ||
5312 | if (find_pc_partial_function (bpaddr, NULL, &func_start, NULL) | |
5313 | && func_start > boundary) | |
5314 | boundary = func_start; | |
5315 | ||
5316 | /* Search for a candidate IT instruction. We have to do some fancy | |
5317 | footwork to distinguish a real IT instruction from the second | |
5318 | half of a 32-bit instruction, but there is no need for that if | |
5319 | there's no candidate. */ | |
5320 | buf_len = min (bpaddr - boundary, MAX_IT_BLOCK_PREFIX); | |
5321 | if (buf_len == 0) | |
5322 | /* No room for an IT instruction. */ | |
5323 | return bpaddr; | |
5324 | ||
5325 | buf = xmalloc (buf_len); | |
5326 | if (target_read_memory (bpaddr - buf_len, buf, buf_len) != 0) | |
5327 | return bpaddr; | |
5328 | any = 0; | |
5329 | for (i = 0; i < buf_len; i += 2) | |
5330 | { | |
5331 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5332 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
5333 | { | |
5334 | any = 1; | |
5335 | break; | |
5336 | } | |
5337 | } | |
5338 | if (any == 0) | |
5339 | { | |
5340 | xfree (buf); | |
5341 | return bpaddr; | |
5342 | } | |
5343 | ||
5344 | /* OK, the code bytes before this instruction contain at least one | |
5345 | halfword which resembles an IT instruction. We know that it's | |
5346 | Thumb code, but there are still two possibilities. Either the | |
5347 | halfword really is an IT instruction, or it is the second half of | |
5348 | a 32-bit Thumb instruction. The only way we can tell is to | |
5349 | scan forwards from a known instruction boundary. */ | |
5350 | if (bpaddr - boundary > IT_SCAN_THRESHOLD) | |
5351 | { | |
5352 | int definite; | |
5353 | ||
5354 | /* There's a lot of code before this instruction. Start with an | |
5355 | optimistic search; it's easy to recognize halfwords that can | |
5356 | not be the start of a 32-bit instruction, and use that to | |
5357 | lock on to the instruction boundaries. */ | |
5358 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, IT_SCAN_THRESHOLD); | |
5359 | if (buf == NULL) | |
5360 | return bpaddr; | |
5361 | buf_len = IT_SCAN_THRESHOLD; | |
5362 | ||
5363 | definite = 0; | |
5364 | for (i = 0; i < buf_len - sizeof (buf) && ! definite; i += 2) | |
5365 | { | |
5366 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5367 | if (thumb_insn_size (inst1) == 2) | |
5368 | { | |
5369 | definite = 1; | |
5370 | break; | |
5371 | } | |
5372 | } | |
5373 | ||
5374 | /* At this point, if DEFINITE, BUF[I] is the first place we | |
5375 | are sure that we know the instruction boundaries, and it is far | |
5376 | enough from BPADDR that we could not miss an IT instruction | |
5377 | affecting BPADDR. If ! DEFINITE, give up - start from a | |
5378 | known boundary. */ | |
5379 | if (! definite) | |
5380 | { | |
0963b4bd MS |
5381 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, |
5382 | bpaddr - boundary); | |
f9d67f43 DJ |
5383 | if (buf == NULL) |
5384 | return bpaddr; | |
5385 | buf_len = bpaddr - boundary; | |
5386 | i = 0; | |
5387 | } | |
5388 | } | |
5389 | else | |
5390 | { | |
5391 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary); | |
5392 | if (buf == NULL) | |
5393 | return bpaddr; | |
5394 | buf_len = bpaddr - boundary; | |
5395 | i = 0; | |
5396 | } | |
5397 | ||
5398 | /* Scan forwards. Find the last IT instruction before BPADDR. */ | |
5399 | last_it = -1; | |
5400 | last_it_count = 0; | |
5401 | while (i < buf_len) | |
5402 | { | |
5403 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5404 | last_it_count--; | |
5405 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
5406 | { | |
5407 | last_it = i; | |
5408 | if (inst1 & 0x0001) | |
5409 | last_it_count = 4; | |
5410 | else if (inst1 & 0x0002) | |
5411 | last_it_count = 3; | |
5412 | else if (inst1 & 0x0004) | |
5413 | last_it_count = 2; | |
5414 | else | |
5415 | last_it_count = 1; | |
5416 | } | |
5417 | i += thumb_insn_size (inst1); | |
5418 | } | |
5419 | ||
5420 | xfree (buf); | |
5421 | ||
5422 | if (last_it == -1) | |
5423 | /* There wasn't really an IT instruction after all. */ | |
5424 | return bpaddr; | |
5425 | ||
5426 | if (last_it_count < 1) | |
5427 | /* It was too far away. */ | |
5428 | return bpaddr; | |
5429 | ||
5430 | /* This really is a trouble spot. Move the breakpoint to the IT | |
5431 | instruction. */ | |
5432 | return bpaddr - buf_len + last_it; | |
5433 | } | |
5434 | ||
cca44b1b | 5435 | /* ARM displaced stepping support. |
c906108c | 5436 | |
cca44b1b | 5437 | Generally ARM displaced stepping works as follows: |
c906108c | 5438 | |
cca44b1b JB |
5439 | 1. When an instruction is to be single-stepped, it is first decoded by |
5440 | arm_process_displaced_insn (called from arm_displaced_step_copy_insn). | |
5441 | Depending on the type of instruction, it is then copied to a scratch | |
5442 | location, possibly in a modified form. The copy_* set of functions | |
0963b4bd | 5443 | performs such modification, as necessary. A breakpoint is placed after |
cca44b1b JB |
5444 | the modified instruction in the scratch space to return control to GDB. |
5445 | Note in particular that instructions which modify the PC will no longer | |
5446 | do so after modification. | |
c5aa993b | 5447 | |
cca44b1b JB |
5448 | 2. The instruction is single-stepped, by setting the PC to the scratch |
5449 | location address, and resuming. Control returns to GDB when the | |
5450 | breakpoint is hit. | |
c5aa993b | 5451 | |
cca44b1b JB |
5452 | 3. A cleanup function (cleanup_*) is called corresponding to the copy_* |
5453 | function used for the current instruction. This function's job is to | |
5454 | put the CPU/memory state back to what it would have been if the | |
5455 | instruction had been executed unmodified in its original location. */ | |
c5aa993b | 5456 | |
cca44b1b JB |
5457 | /* NOP instruction (mov r0, r0). */ |
5458 | #define ARM_NOP 0xe1a00000 | |
34518530 | 5459 | #define THUMB_NOP 0x4600 |
cca44b1b JB |
5460 | |
5461 | /* Helper for register reads for displaced stepping. In particular, this | |
5462 | returns the PC as it would be seen by the instruction at its original | |
5463 | location. */ | |
5464 | ||
5465 | ULONGEST | |
36073a92 YQ |
5466 | displaced_read_reg (struct regcache *regs, struct displaced_step_closure *dsc, |
5467 | int regno) | |
cca44b1b JB |
5468 | { |
5469 | ULONGEST ret; | |
36073a92 | 5470 | CORE_ADDR from = dsc->insn_addr; |
cca44b1b | 5471 | |
bf9f652a | 5472 | if (regno == ARM_PC_REGNUM) |
cca44b1b | 5473 | { |
4db71c0b YQ |
5474 | /* Compute pipeline offset: |
5475 | - When executing an ARM instruction, PC reads as the address of the | |
5476 | current instruction plus 8. | |
5477 | - When executing a Thumb instruction, PC reads as the address of the | |
5478 | current instruction plus 4. */ | |
5479 | ||
36073a92 | 5480 | if (!dsc->is_thumb) |
4db71c0b YQ |
5481 | from += 8; |
5482 | else | |
5483 | from += 4; | |
5484 | ||
cca44b1b JB |
5485 | if (debug_displaced) |
5486 | fprintf_unfiltered (gdb_stdlog, "displaced: read pc value %.8lx\n", | |
4db71c0b YQ |
5487 | (unsigned long) from); |
5488 | return (ULONGEST) from; | |
cca44b1b | 5489 | } |
c906108c | 5490 | else |
cca44b1b JB |
5491 | { |
5492 | regcache_cooked_read_unsigned (regs, regno, &ret); | |
5493 | if (debug_displaced) | |
5494 | fprintf_unfiltered (gdb_stdlog, "displaced: read r%d value %.8lx\n", | |
5495 | regno, (unsigned long) ret); | |
5496 | return ret; | |
5497 | } | |
c906108c SS |
5498 | } |
5499 | ||
cca44b1b JB |
5500 | static int |
5501 | displaced_in_arm_mode (struct regcache *regs) | |
5502 | { | |
5503 | ULONGEST ps; | |
9779414d | 5504 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
66e810cd | 5505 | |
cca44b1b | 5506 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); |
66e810cd | 5507 | |
9779414d | 5508 | return (ps & t_bit) == 0; |
cca44b1b | 5509 | } |
66e810cd | 5510 | |
cca44b1b | 5511 | /* Write to the PC as from a branch instruction. */ |
c906108c | 5512 | |
cca44b1b | 5513 | static void |
36073a92 YQ |
5514 | branch_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5515 | ULONGEST val) | |
c906108c | 5516 | { |
36073a92 | 5517 | if (!dsc->is_thumb) |
cca44b1b JB |
5518 | /* Note: If bits 0/1 are set, this branch would be unpredictable for |
5519 | architecture versions < 6. */ | |
0963b4bd MS |
5520 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
5521 | val & ~(ULONGEST) 0x3); | |
cca44b1b | 5522 | else |
0963b4bd MS |
5523 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
5524 | val & ~(ULONGEST) 0x1); | |
cca44b1b | 5525 | } |
66e810cd | 5526 | |
cca44b1b JB |
5527 | /* Write to the PC as from a branch-exchange instruction. */ |
5528 | ||
5529 | static void | |
5530 | bx_write_pc (struct regcache *regs, ULONGEST val) | |
5531 | { | |
5532 | ULONGEST ps; | |
9779414d | 5533 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
cca44b1b JB |
5534 | |
5535 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); | |
5536 | ||
5537 | if ((val & 1) == 1) | |
c906108c | 5538 | { |
9779414d | 5539 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps | t_bit); |
cca44b1b JB |
5540 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffe); |
5541 | } | |
5542 | else if ((val & 2) == 0) | |
5543 | { | |
9779414d | 5544 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 5545 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val); |
c906108c SS |
5546 | } |
5547 | else | |
5548 | { | |
cca44b1b JB |
5549 | /* Unpredictable behaviour. Try to do something sensible (switch to ARM |
5550 | mode, align dest to 4 bytes). */ | |
5551 | warning (_("Single-stepping BX to non-word-aligned ARM instruction.")); | |
9779414d | 5552 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 5553 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffc); |
c906108c SS |
5554 | } |
5555 | } | |
ed9a39eb | 5556 | |
cca44b1b | 5557 | /* Write to the PC as if from a load instruction. */ |
ed9a39eb | 5558 | |
34e8f22d | 5559 | static void |
36073a92 YQ |
5560 | load_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5561 | ULONGEST val) | |
ed9a39eb | 5562 | { |
cca44b1b JB |
5563 | if (DISPLACED_STEPPING_ARCH_VERSION >= 5) |
5564 | bx_write_pc (regs, val); | |
5565 | else | |
36073a92 | 5566 | branch_write_pc (regs, dsc, val); |
cca44b1b | 5567 | } |
be8626e0 | 5568 | |
cca44b1b JB |
5569 | /* Write to the PC as if from an ALU instruction. */ |
5570 | ||
5571 | static void | |
36073a92 YQ |
5572 | alu_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5573 | ULONGEST val) | |
cca44b1b | 5574 | { |
36073a92 | 5575 | if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && !dsc->is_thumb) |
cca44b1b JB |
5576 | bx_write_pc (regs, val); |
5577 | else | |
36073a92 | 5578 | branch_write_pc (regs, dsc, val); |
cca44b1b JB |
5579 | } |
5580 | ||
5581 | /* Helper for writing to registers for displaced stepping. Writing to the PC | |
5582 | has a varying effects depending on the instruction which does the write: | |
5583 | this is controlled by the WRITE_PC argument. */ | |
5584 | ||
5585 | void | |
5586 | displaced_write_reg (struct regcache *regs, struct displaced_step_closure *dsc, | |
5587 | int regno, ULONGEST val, enum pc_write_style write_pc) | |
5588 | { | |
bf9f652a | 5589 | if (regno == ARM_PC_REGNUM) |
08216dd7 | 5590 | { |
cca44b1b JB |
5591 | if (debug_displaced) |
5592 | fprintf_unfiltered (gdb_stdlog, "displaced: writing pc %.8lx\n", | |
5593 | (unsigned long) val); | |
5594 | switch (write_pc) | |
08216dd7 | 5595 | { |
cca44b1b | 5596 | case BRANCH_WRITE_PC: |
36073a92 | 5597 | branch_write_pc (regs, dsc, val); |
08216dd7 RE |
5598 | break; |
5599 | ||
cca44b1b JB |
5600 | case BX_WRITE_PC: |
5601 | bx_write_pc (regs, val); | |
5602 | break; | |
5603 | ||
5604 | case LOAD_WRITE_PC: | |
36073a92 | 5605 | load_write_pc (regs, dsc, val); |
cca44b1b JB |
5606 | break; |
5607 | ||
5608 | case ALU_WRITE_PC: | |
36073a92 | 5609 | alu_write_pc (regs, dsc, val); |
cca44b1b JB |
5610 | break; |
5611 | ||
5612 | case CANNOT_WRITE_PC: | |
5613 | warning (_("Instruction wrote to PC in an unexpected way when " | |
5614 | "single-stepping")); | |
08216dd7 RE |
5615 | break; |
5616 | ||
5617 | default: | |
97b9747c JB |
5618 | internal_error (__FILE__, __LINE__, |
5619 | _("Invalid argument to displaced_write_reg")); | |
08216dd7 | 5620 | } |
b508a996 | 5621 | |
cca44b1b | 5622 | dsc->wrote_to_pc = 1; |
b508a996 | 5623 | } |
ed9a39eb | 5624 | else |
b508a996 | 5625 | { |
cca44b1b JB |
5626 | if (debug_displaced) |
5627 | fprintf_unfiltered (gdb_stdlog, "displaced: writing r%d value %.8lx\n", | |
5628 | regno, (unsigned long) val); | |
5629 | regcache_cooked_write_unsigned (regs, regno, val); | |
b508a996 | 5630 | } |
34e8f22d RE |
5631 | } |
5632 | ||
cca44b1b JB |
5633 | /* This function is used to concisely determine if an instruction INSN |
5634 | references PC. Register fields of interest in INSN should have the | |
0963b4bd MS |
5635 | corresponding fields of BITMASK set to 0b1111. The function |
5636 | returns return 1 if any of these fields in INSN reference the PC | |
5637 | (also 0b1111, r15), else it returns 0. */ | |
67255d04 RE |
5638 | |
5639 | static int | |
cca44b1b | 5640 | insn_references_pc (uint32_t insn, uint32_t bitmask) |
67255d04 | 5641 | { |
cca44b1b | 5642 | uint32_t lowbit = 1; |
67255d04 | 5643 | |
cca44b1b JB |
5644 | while (bitmask != 0) |
5645 | { | |
5646 | uint32_t mask; | |
44e1a9eb | 5647 | |
cca44b1b JB |
5648 | for (; lowbit && (bitmask & lowbit) == 0; lowbit <<= 1) |
5649 | ; | |
67255d04 | 5650 | |
cca44b1b JB |
5651 | if (!lowbit) |
5652 | break; | |
67255d04 | 5653 | |
cca44b1b | 5654 | mask = lowbit * 0xf; |
67255d04 | 5655 | |
cca44b1b JB |
5656 | if ((insn & mask) == mask) |
5657 | return 1; | |
5658 | ||
5659 | bitmask &= ~mask; | |
67255d04 RE |
5660 | } |
5661 | ||
cca44b1b JB |
5662 | return 0; |
5663 | } | |
2af48f68 | 5664 | |
cca44b1b JB |
5665 | /* The simplest copy function. Many instructions have the same effect no |
5666 | matter what address they are executed at: in those cases, use this. */ | |
67255d04 | 5667 | |
cca44b1b | 5668 | static int |
7ff120b4 YQ |
5669 | arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn, |
5670 | const char *iname, struct displaced_step_closure *dsc) | |
cca44b1b JB |
5671 | { |
5672 | if (debug_displaced) | |
5673 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx, " | |
5674 | "opcode/class '%s' unmodified\n", (unsigned long) insn, | |
5675 | iname); | |
67255d04 | 5676 | |
cca44b1b | 5677 | dsc->modinsn[0] = insn; |
67255d04 | 5678 | |
cca44b1b JB |
5679 | return 0; |
5680 | } | |
5681 | ||
34518530 YQ |
5682 | static int |
5683 | thumb_copy_unmodified_32bit (struct gdbarch *gdbarch, uint16_t insn1, | |
5684 | uint16_t insn2, const char *iname, | |
5685 | struct displaced_step_closure *dsc) | |
5686 | { | |
5687 | if (debug_displaced) | |
5688 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x %.4x, " | |
5689 | "opcode/class '%s' unmodified\n", insn1, insn2, | |
5690 | iname); | |
5691 | ||
5692 | dsc->modinsn[0] = insn1; | |
5693 | dsc->modinsn[1] = insn2; | |
5694 | dsc->numinsns = 2; | |
5695 | ||
5696 | return 0; | |
5697 | } | |
5698 | ||
5699 | /* Copy 16-bit Thumb(Thumb and 16-bit Thumb-2) instruction without any | |
5700 | modification. */ | |
5701 | static int | |
5702 | thumb_copy_unmodified_16bit (struct gdbarch *gdbarch, unsigned int insn, | |
5703 | const char *iname, | |
5704 | struct displaced_step_closure *dsc) | |
5705 | { | |
5706 | if (debug_displaced) | |
5707 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x, " | |
5708 | "opcode/class '%s' unmodified\n", insn, | |
5709 | iname); | |
5710 | ||
5711 | dsc->modinsn[0] = insn; | |
5712 | ||
5713 | return 0; | |
5714 | } | |
5715 | ||
cca44b1b JB |
5716 | /* Preload instructions with immediate offset. */ |
5717 | ||
5718 | static void | |
6e39997a | 5719 | cleanup_preload (struct gdbarch *gdbarch, |
cca44b1b JB |
5720 | struct regcache *regs, struct displaced_step_closure *dsc) |
5721 | { | |
5722 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5723 | if (!dsc->u.preload.immed) | |
5724 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5725 | } | |
5726 | ||
7ff120b4 YQ |
5727 | static void |
5728 | install_preload (struct gdbarch *gdbarch, struct regcache *regs, | |
5729 | struct displaced_step_closure *dsc, unsigned int rn) | |
cca44b1b | 5730 | { |
cca44b1b | 5731 | ULONGEST rn_val; |
cca44b1b JB |
5732 | /* Preload instructions: |
5733 | ||
5734 | {pli/pld} [rn, #+/-imm] | |
5735 | -> | |
5736 | {pli/pld} [r0, #+/-imm]. */ | |
5737 | ||
36073a92 YQ |
5738 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5739 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 5740 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
cca44b1b JB |
5741 | dsc->u.preload.immed = 1; |
5742 | ||
cca44b1b | 5743 | dsc->cleanup = &cleanup_preload; |
cca44b1b JB |
5744 | } |
5745 | ||
cca44b1b | 5746 | static int |
7ff120b4 | 5747 | arm_copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
cca44b1b JB |
5748 | struct displaced_step_closure *dsc) |
5749 | { | |
5750 | unsigned int rn = bits (insn, 16, 19); | |
cca44b1b | 5751 | |
7ff120b4 YQ |
5752 | if (!insn_references_pc (insn, 0x000f0000ul)) |
5753 | return arm_copy_unmodified (gdbarch, insn, "preload", dsc); | |
cca44b1b JB |
5754 | |
5755 | if (debug_displaced) | |
5756 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
5757 | (unsigned long) insn); | |
5758 | ||
7ff120b4 YQ |
5759 | dsc->modinsn[0] = insn & 0xfff0ffff; |
5760 | ||
5761 | install_preload (gdbarch, regs, dsc, rn); | |
5762 | ||
5763 | return 0; | |
5764 | } | |
5765 | ||
34518530 YQ |
5766 | static int |
5767 | thumb2_copy_preload (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
5768 | struct regcache *regs, struct displaced_step_closure *dsc) | |
5769 | { | |
5770 | unsigned int rn = bits (insn1, 0, 3); | |
5771 | unsigned int u_bit = bit (insn1, 7); | |
5772 | int imm12 = bits (insn2, 0, 11); | |
5773 | ULONGEST pc_val; | |
5774 | ||
5775 | if (rn != ARM_PC_REGNUM) | |
5776 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "preload", dsc); | |
5777 | ||
5778 | /* PC is only allowed to use in PLI (immediate,literal) Encoding T3, and | |
5779 | PLD (literal) Encoding T1. */ | |
5780 | if (debug_displaced) | |
5781 | fprintf_unfiltered (gdb_stdlog, | |
5782 | "displaced: copying pld/pli pc (0x%x) %c imm12 %.4x\n", | |
5783 | (unsigned int) dsc->insn_addr, u_bit ? '+' : '-', | |
5784 | imm12); | |
5785 | ||
5786 | if (!u_bit) | |
5787 | imm12 = -1 * imm12; | |
5788 | ||
5789 | /* Rewrite instruction {pli/pld} PC imm12 into: | |
5790 | Prepare: tmp[0] <- r0, tmp[1] <- r1, r0 <- pc, r1 <- imm12 | |
5791 | ||
5792 | {pli/pld} [r0, r1] | |
5793 | ||
5794 | Cleanup: r0 <- tmp[0], r1 <- tmp[1]. */ | |
5795 | ||
5796 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
5797 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5798 | ||
5799 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
5800 | ||
5801 | displaced_write_reg (regs, dsc, 0, pc_val, CANNOT_WRITE_PC); | |
5802 | displaced_write_reg (regs, dsc, 1, imm12, CANNOT_WRITE_PC); | |
5803 | dsc->u.preload.immed = 0; | |
5804 | ||
5805 | /* {pli/pld} [r0, r1] */ | |
5806 | dsc->modinsn[0] = insn1 & 0xfff0; | |
5807 | dsc->modinsn[1] = 0xf001; | |
5808 | dsc->numinsns = 2; | |
5809 | ||
5810 | dsc->cleanup = &cleanup_preload; | |
5811 | return 0; | |
5812 | } | |
5813 | ||
7ff120b4 YQ |
5814 | /* Preload instructions with register offset. */ |
5815 | ||
5816 | static void | |
5817 | install_preload_reg(struct gdbarch *gdbarch, struct regcache *regs, | |
5818 | struct displaced_step_closure *dsc, unsigned int rn, | |
5819 | unsigned int rm) | |
5820 | { | |
5821 | ULONGEST rn_val, rm_val; | |
5822 | ||
cca44b1b JB |
5823 | /* Preload register-offset instructions: |
5824 | ||
5825 | {pli/pld} [rn, rm {, shift}] | |
5826 | -> | |
5827 | {pli/pld} [r0, r1 {, shift}]. */ | |
5828 | ||
36073a92 YQ |
5829 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5830 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5831 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5832 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
5833 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5834 | displaced_write_reg (regs, dsc, 1, rm_val, CANNOT_WRITE_PC); | |
cca44b1b JB |
5835 | dsc->u.preload.immed = 0; |
5836 | ||
cca44b1b | 5837 | dsc->cleanup = &cleanup_preload; |
7ff120b4 YQ |
5838 | } |
5839 | ||
5840 | static int | |
5841 | arm_copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn, | |
5842 | struct regcache *regs, | |
5843 | struct displaced_step_closure *dsc) | |
5844 | { | |
5845 | unsigned int rn = bits (insn, 16, 19); | |
5846 | unsigned int rm = bits (insn, 0, 3); | |
5847 | ||
5848 | ||
5849 | if (!insn_references_pc (insn, 0x000f000ful)) | |
5850 | return arm_copy_unmodified (gdbarch, insn, "preload reg", dsc); | |
5851 | ||
5852 | if (debug_displaced) | |
5853 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
5854 | (unsigned long) insn); | |
5855 | ||
5856 | dsc->modinsn[0] = (insn & 0xfff0fff0) | 0x1; | |
cca44b1b | 5857 | |
7ff120b4 | 5858 | install_preload_reg (gdbarch, regs, dsc, rn, rm); |
cca44b1b JB |
5859 | return 0; |
5860 | } | |
5861 | ||
5862 | /* Copy/cleanup coprocessor load and store instructions. */ | |
5863 | ||
5864 | static void | |
6e39997a | 5865 | cleanup_copro_load_store (struct gdbarch *gdbarch, |
cca44b1b JB |
5866 | struct regcache *regs, |
5867 | struct displaced_step_closure *dsc) | |
5868 | { | |
36073a92 | 5869 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5870 | |
5871 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5872 | ||
5873 | if (dsc->u.ldst.writeback) | |
5874 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, LOAD_WRITE_PC); | |
5875 | } | |
5876 | ||
7ff120b4 YQ |
5877 | static void |
5878 | install_copro_load_store (struct gdbarch *gdbarch, struct regcache *regs, | |
5879 | struct displaced_step_closure *dsc, | |
5880 | int writeback, unsigned int rn) | |
cca44b1b | 5881 | { |
cca44b1b | 5882 | ULONGEST rn_val; |
cca44b1b | 5883 | |
cca44b1b JB |
5884 | /* Coprocessor load/store instructions: |
5885 | ||
5886 | {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes) | |
5887 | -> | |
5888 | {stc/stc2} [r0, #+/-imm]. | |
5889 | ||
5890 | ldc/ldc2 are handled identically. */ | |
5891 | ||
36073a92 YQ |
5892 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5893 | rn_val = displaced_read_reg (regs, dsc, rn); | |
2b16b2e3 YQ |
5894 | /* PC should be 4-byte aligned. */ |
5895 | rn_val = rn_val & 0xfffffffc; | |
cca44b1b JB |
5896 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5897 | ||
7ff120b4 | 5898 | dsc->u.ldst.writeback = writeback; |
cca44b1b JB |
5899 | dsc->u.ldst.rn = rn; |
5900 | ||
7ff120b4 YQ |
5901 | dsc->cleanup = &cleanup_copro_load_store; |
5902 | } | |
5903 | ||
5904 | static int | |
5905 | arm_copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn, | |
5906 | struct regcache *regs, | |
5907 | struct displaced_step_closure *dsc) | |
5908 | { | |
5909 | unsigned int rn = bits (insn, 16, 19); | |
5910 | ||
5911 | if (!insn_references_pc (insn, 0x000f0000ul)) | |
5912 | return arm_copy_unmodified (gdbarch, insn, "copro load/store", dsc); | |
5913 | ||
5914 | if (debug_displaced) | |
5915 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
5916 | "load/store insn %.8lx\n", (unsigned long) insn); | |
5917 | ||
cca44b1b JB |
5918 | dsc->modinsn[0] = insn & 0xfff0ffff; |
5919 | ||
7ff120b4 | 5920 | install_copro_load_store (gdbarch, regs, dsc, bit (insn, 25), rn); |
cca44b1b JB |
5921 | |
5922 | return 0; | |
5923 | } | |
5924 | ||
34518530 YQ |
5925 | static int |
5926 | thumb2_copy_copro_load_store (struct gdbarch *gdbarch, uint16_t insn1, | |
5927 | uint16_t insn2, struct regcache *regs, | |
5928 | struct displaced_step_closure *dsc) | |
5929 | { | |
5930 | unsigned int rn = bits (insn1, 0, 3); | |
5931 | ||
5932 | if (rn != ARM_PC_REGNUM) | |
5933 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
5934 | "copro load/store", dsc); | |
5935 | ||
5936 | if (debug_displaced) | |
5937 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
5938 | "load/store insn %.4x%.4x\n", insn1, insn2); | |
5939 | ||
5940 | dsc->modinsn[0] = insn1 & 0xfff0; | |
5941 | dsc->modinsn[1] = insn2; | |
5942 | dsc->numinsns = 2; | |
5943 | ||
5944 | /* This function is called for copying instruction LDC/LDC2/VLDR, which | |
5945 | doesn't support writeback, so pass 0. */ | |
5946 | install_copro_load_store (gdbarch, regs, dsc, 0, rn); | |
5947 | ||
5948 | return 0; | |
5949 | } | |
5950 | ||
cca44b1b JB |
5951 | /* Clean up branch instructions (actually perform the branch, by setting |
5952 | PC). */ | |
5953 | ||
5954 | static void | |
6e39997a | 5955 | cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
5956 | struct displaced_step_closure *dsc) |
5957 | { | |
36073a92 | 5958 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
5959 | int branch_taken = condition_true (dsc->u.branch.cond, status); |
5960 | enum pc_write_style write_pc = dsc->u.branch.exchange | |
5961 | ? BX_WRITE_PC : BRANCH_WRITE_PC; | |
5962 | ||
5963 | if (!branch_taken) | |
5964 | return; | |
5965 | ||
5966 | if (dsc->u.branch.link) | |
5967 | { | |
8c8dba6d YQ |
5968 | /* The value of LR should be the next insn of current one. In order |
5969 | not to confuse logic hanlding later insn `bx lr', if current insn mode | |
5970 | is Thumb, the bit 0 of LR value should be set to 1. */ | |
5971 | ULONGEST next_insn_addr = dsc->insn_addr + dsc->insn_size; | |
5972 | ||
5973 | if (dsc->is_thumb) | |
5974 | next_insn_addr |= 0x1; | |
5975 | ||
5976 | displaced_write_reg (regs, dsc, ARM_LR_REGNUM, next_insn_addr, | |
5977 | CANNOT_WRITE_PC); | |
cca44b1b JB |
5978 | } |
5979 | ||
bf9f652a | 5980 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->u.branch.dest, write_pc); |
cca44b1b JB |
5981 | } |
5982 | ||
5983 | /* Copy B/BL/BLX instructions with immediate destinations. */ | |
5984 | ||
7ff120b4 YQ |
5985 | static void |
5986 | install_b_bl_blx (struct gdbarch *gdbarch, struct regcache *regs, | |
5987 | struct displaced_step_closure *dsc, | |
5988 | unsigned int cond, int exchange, int link, long offset) | |
5989 | { | |
5990 | /* Implement "BL<cond> <label>" as: | |
5991 | ||
5992 | Preparation: cond <- instruction condition | |
5993 | Insn: mov r0, r0 (nop) | |
5994 | Cleanup: if (condition true) { r14 <- pc; pc <- label }. | |
5995 | ||
5996 | B<cond> similar, but don't set r14 in cleanup. */ | |
5997 | ||
5998 | dsc->u.branch.cond = cond; | |
5999 | dsc->u.branch.link = link; | |
6000 | dsc->u.branch.exchange = exchange; | |
6001 | ||
2b16b2e3 YQ |
6002 | dsc->u.branch.dest = dsc->insn_addr; |
6003 | if (link && exchange) | |
6004 | /* For BLX, offset is computed from the Align (PC, 4). */ | |
6005 | dsc->u.branch.dest = dsc->u.branch.dest & 0xfffffffc; | |
6006 | ||
7ff120b4 | 6007 | if (dsc->is_thumb) |
2b16b2e3 | 6008 | dsc->u.branch.dest += 4 + offset; |
7ff120b4 | 6009 | else |
2b16b2e3 | 6010 | dsc->u.branch.dest += 8 + offset; |
7ff120b4 YQ |
6011 | |
6012 | dsc->cleanup = &cleanup_branch; | |
6013 | } | |
cca44b1b | 6014 | static int |
7ff120b4 YQ |
6015 | arm_copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn, |
6016 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
6017 | { |
6018 | unsigned int cond = bits (insn, 28, 31); | |
6019 | int exchange = (cond == 0xf); | |
6020 | int link = exchange || bit (insn, 24); | |
cca44b1b JB |
6021 | long offset; |
6022 | ||
6023 | if (debug_displaced) | |
6024 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s immediate insn " | |
6025 | "%.8lx\n", (exchange) ? "blx" : (link) ? "bl" : "b", | |
6026 | (unsigned long) insn); | |
cca44b1b JB |
6027 | if (exchange) |
6028 | /* For BLX, set bit 0 of the destination. The cleanup_branch function will | |
6029 | then arrange the switch into Thumb mode. */ | |
6030 | offset = (bits (insn, 0, 23) << 2) | (bit (insn, 24) << 1) | 1; | |
6031 | else | |
6032 | offset = bits (insn, 0, 23) << 2; | |
6033 | ||
6034 | if (bit (offset, 25)) | |
6035 | offset = offset | ~0x3ffffff; | |
6036 | ||
cca44b1b JB |
6037 | dsc->modinsn[0] = ARM_NOP; |
6038 | ||
7ff120b4 | 6039 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); |
cca44b1b JB |
6040 | return 0; |
6041 | } | |
6042 | ||
34518530 YQ |
6043 | static int |
6044 | thumb2_copy_b_bl_blx (struct gdbarch *gdbarch, uint16_t insn1, | |
6045 | uint16_t insn2, struct regcache *regs, | |
6046 | struct displaced_step_closure *dsc) | |
6047 | { | |
6048 | int link = bit (insn2, 14); | |
6049 | int exchange = link && !bit (insn2, 12); | |
6050 | int cond = INST_AL; | |
6051 | long offset = 0; | |
6052 | int j1 = bit (insn2, 13); | |
6053 | int j2 = bit (insn2, 11); | |
6054 | int s = sbits (insn1, 10, 10); | |
6055 | int i1 = !(j1 ^ bit (insn1, 10)); | |
6056 | int i2 = !(j2 ^ bit (insn1, 10)); | |
6057 | ||
6058 | if (!link && !exchange) /* B */ | |
6059 | { | |
6060 | offset = (bits (insn2, 0, 10) << 1); | |
6061 | if (bit (insn2, 12)) /* Encoding T4 */ | |
6062 | { | |
6063 | offset |= (bits (insn1, 0, 9) << 12) | |
6064 | | (i2 << 22) | |
6065 | | (i1 << 23) | |
6066 | | (s << 24); | |
6067 | cond = INST_AL; | |
6068 | } | |
6069 | else /* Encoding T3 */ | |
6070 | { | |
6071 | offset |= (bits (insn1, 0, 5) << 12) | |
6072 | | (j1 << 18) | |
6073 | | (j2 << 19) | |
6074 | | (s << 20); | |
6075 | cond = bits (insn1, 6, 9); | |
6076 | } | |
6077 | } | |
6078 | else | |
6079 | { | |
6080 | offset = (bits (insn1, 0, 9) << 12); | |
6081 | offset |= ((i2 << 22) | (i1 << 23) | (s << 24)); | |
6082 | offset |= exchange ? | |
6083 | (bits (insn2, 1, 10) << 2) : (bits (insn2, 0, 10) << 1); | |
6084 | } | |
6085 | ||
6086 | if (debug_displaced) | |
6087 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s insn " | |
6088 | "%.4x %.4x with offset %.8lx\n", | |
6089 | link ? (exchange) ? "blx" : "bl" : "b", | |
6090 | insn1, insn2, offset); | |
6091 | ||
6092 | dsc->modinsn[0] = THUMB_NOP; | |
6093 | ||
6094 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); | |
6095 | return 0; | |
6096 | } | |
6097 | ||
6098 | /* Copy B Thumb instructions. */ | |
6099 | static int | |
6100 | thumb_copy_b (struct gdbarch *gdbarch, unsigned short insn, | |
6101 | struct displaced_step_closure *dsc) | |
6102 | { | |
6103 | unsigned int cond = 0; | |
6104 | int offset = 0; | |
6105 | unsigned short bit_12_15 = bits (insn, 12, 15); | |
6106 | CORE_ADDR from = dsc->insn_addr; | |
6107 | ||
6108 | if (bit_12_15 == 0xd) | |
6109 | { | |
6110 | /* offset = SignExtend (imm8:0, 32) */ | |
6111 | offset = sbits ((insn << 1), 0, 8); | |
6112 | cond = bits (insn, 8, 11); | |
6113 | } | |
6114 | else if (bit_12_15 == 0xe) /* Encoding T2 */ | |
6115 | { | |
6116 | offset = sbits ((insn << 1), 0, 11); | |
6117 | cond = INST_AL; | |
6118 | } | |
6119 | ||
6120 | if (debug_displaced) | |
6121 | fprintf_unfiltered (gdb_stdlog, | |
6122 | "displaced: copying b immediate insn %.4x " | |
6123 | "with offset %d\n", insn, offset); | |
6124 | ||
6125 | dsc->u.branch.cond = cond; | |
6126 | dsc->u.branch.link = 0; | |
6127 | dsc->u.branch.exchange = 0; | |
6128 | dsc->u.branch.dest = from + 4 + offset; | |
6129 | ||
6130 | dsc->modinsn[0] = THUMB_NOP; | |
6131 | ||
6132 | dsc->cleanup = &cleanup_branch; | |
6133 | ||
6134 | return 0; | |
6135 | } | |
6136 | ||
cca44b1b JB |
6137 | /* Copy BX/BLX with register-specified destinations. */ |
6138 | ||
7ff120b4 YQ |
6139 | static void |
6140 | install_bx_blx_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6141 | struct displaced_step_closure *dsc, int link, | |
6142 | unsigned int cond, unsigned int rm) | |
cca44b1b | 6143 | { |
cca44b1b JB |
6144 | /* Implement {BX,BLX}<cond> <reg>" as: |
6145 | ||
6146 | Preparation: cond <- instruction condition | |
6147 | Insn: mov r0, r0 (nop) | |
6148 | Cleanup: if (condition true) { r14 <- pc; pc <- dest; }. | |
6149 | ||
6150 | Don't set r14 in cleanup for BX. */ | |
6151 | ||
36073a92 | 6152 | dsc->u.branch.dest = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6153 | |
6154 | dsc->u.branch.cond = cond; | |
6155 | dsc->u.branch.link = link; | |
cca44b1b | 6156 | |
7ff120b4 | 6157 | dsc->u.branch.exchange = 1; |
cca44b1b JB |
6158 | |
6159 | dsc->cleanup = &cleanup_branch; | |
7ff120b4 | 6160 | } |
cca44b1b | 6161 | |
7ff120b4 YQ |
6162 | static int |
6163 | arm_copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn, | |
6164 | struct regcache *regs, struct displaced_step_closure *dsc) | |
6165 | { | |
6166 | unsigned int cond = bits (insn, 28, 31); | |
6167 | /* BX: x12xxx1x | |
6168 | BLX: x12xxx3x. */ | |
6169 | int link = bit (insn, 5); | |
6170 | unsigned int rm = bits (insn, 0, 3); | |
6171 | ||
6172 | if (debug_displaced) | |
6173 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx", | |
6174 | (unsigned long) insn); | |
6175 | ||
6176 | dsc->modinsn[0] = ARM_NOP; | |
6177 | ||
6178 | install_bx_blx_reg (gdbarch, regs, dsc, link, cond, rm); | |
cca44b1b JB |
6179 | return 0; |
6180 | } | |
6181 | ||
34518530 YQ |
6182 | static int |
6183 | thumb_copy_bx_blx_reg (struct gdbarch *gdbarch, uint16_t insn, | |
6184 | struct regcache *regs, | |
6185 | struct displaced_step_closure *dsc) | |
6186 | { | |
6187 | int link = bit (insn, 7); | |
6188 | unsigned int rm = bits (insn, 3, 6); | |
6189 | ||
6190 | if (debug_displaced) | |
6191 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x", | |
6192 | (unsigned short) insn); | |
6193 | ||
6194 | dsc->modinsn[0] = THUMB_NOP; | |
6195 | ||
6196 | install_bx_blx_reg (gdbarch, regs, dsc, link, INST_AL, rm); | |
6197 | ||
6198 | return 0; | |
6199 | } | |
6200 | ||
6201 | ||
0963b4bd | 6202 | /* Copy/cleanup arithmetic/logic instruction with immediate RHS. */ |
cca44b1b JB |
6203 | |
6204 | static void | |
6e39997a | 6205 | cleanup_alu_imm (struct gdbarch *gdbarch, |
cca44b1b JB |
6206 | struct regcache *regs, struct displaced_step_closure *dsc) |
6207 | { | |
36073a92 | 6208 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6209 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
6210 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6211 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6212 | } | |
6213 | ||
6214 | static int | |
7ff120b4 YQ |
6215 | arm_copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
6216 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
6217 | { |
6218 | unsigned int rn = bits (insn, 16, 19); | |
6219 | unsigned int rd = bits (insn, 12, 15); | |
6220 | unsigned int op = bits (insn, 21, 24); | |
6221 | int is_mov = (op == 0xd); | |
6222 | ULONGEST rd_val, rn_val; | |
cca44b1b JB |
6223 | |
6224 | if (!insn_references_pc (insn, 0x000ff000ul)) | |
7ff120b4 | 6225 | return arm_copy_unmodified (gdbarch, insn, "ALU immediate", dsc); |
cca44b1b JB |
6226 | |
6227 | if (debug_displaced) | |
6228 | fprintf_unfiltered (gdb_stdlog, "displaced: copying immediate %s insn " | |
6229 | "%.8lx\n", is_mov ? "move" : "ALU", | |
6230 | (unsigned long) insn); | |
6231 | ||
6232 | /* Instruction is of form: | |
6233 | ||
6234 | <op><cond> rd, [rn,] #imm | |
6235 | ||
6236 | Rewrite as: | |
6237 | ||
6238 | Preparation: tmp1, tmp2 <- r0, r1; | |
6239 | r0, r1 <- rd, rn | |
6240 | Insn: <op><cond> r0, r1, #imm | |
6241 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
6242 | */ | |
6243 | ||
36073a92 YQ |
6244 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6245 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6246 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6247 | rd_val = displaced_read_reg (regs, dsc, rd); | |
cca44b1b JB |
6248 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6249 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6250 | dsc->rd = rd; | |
6251 | ||
6252 | if (is_mov) | |
6253 | dsc->modinsn[0] = insn & 0xfff00fff; | |
6254 | else | |
6255 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x10000; | |
6256 | ||
6257 | dsc->cleanup = &cleanup_alu_imm; | |
6258 | ||
6259 | return 0; | |
6260 | } | |
6261 | ||
34518530 YQ |
6262 | static int |
6263 | thumb2_copy_alu_imm (struct gdbarch *gdbarch, uint16_t insn1, | |
6264 | uint16_t insn2, struct regcache *regs, | |
6265 | struct displaced_step_closure *dsc) | |
6266 | { | |
6267 | unsigned int op = bits (insn1, 5, 8); | |
6268 | unsigned int rn, rm, rd; | |
6269 | ULONGEST rd_val, rn_val; | |
6270 | ||
6271 | rn = bits (insn1, 0, 3); /* Rn */ | |
6272 | rm = bits (insn2, 0, 3); /* Rm */ | |
6273 | rd = bits (insn2, 8, 11); /* Rd */ | |
6274 | ||
6275 | /* This routine is only called for instruction MOV. */ | |
6276 | gdb_assert (op == 0x2 && rn == 0xf); | |
6277 | ||
6278 | if (rm != ARM_PC_REGNUM && rd != ARM_PC_REGNUM) | |
6279 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ALU imm", dsc); | |
6280 | ||
6281 | if (debug_displaced) | |
6282 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x%.4x\n", | |
6283 | "ALU", insn1, insn2); | |
6284 | ||
6285 | /* Instruction is of form: | |
6286 | ||
6287 | <op><cond> rd, [rn,] #imm | |
6288 | ||
6289 | Rewrite as: | |
6290 | ||
6291 | Preparation: tmp1, tmp2 <- r0, r1; | |
6292 | r0, r1 <- rd, rn | |
6293 | Insn: <op><cond> r0, r1, #imm | |
6294 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
6295 | */ | |
6296 | ||
6297 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
6298 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6299 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6300 | rd_val = displaced_read_reg (regs, dsc, rd); | |
6301 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); | |
6302 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6303 | dsc->rd = rd; | |
6304 | ||
6305 | dsc->modinsn[0] = insn1; | |
6306 | dsc->modinsn[1] = ((insn2 & 0xf0f0) | 0x1); | |
6307 | dsc->numinsns = 2; | |
6308 | ||
6309 | dsc->cleanup = &cleanup_alu_imm; | |
6310 | ||
6311 | return 0; | |
6312 | } | |
6313 | ||
cca44b1b JB |
6314 | /* Copy/cleanup arithmetic/logic insns with register RHS. */ |
6315 | ||
6316 | static void | |
6e39997a | 6317 | cleanup_alu_reg (struct gdbarch *gdbarch, |
cca44b1b JB |
6318 | struct regcache *regs, struct displaced_step_closure *dsc) |
6319 | { | |
6320 | ULONGEST rd_val; | |
6321 | int i; | |
6322 | ||
36073a92 | 6323 | rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6324 | |
6325 | for (i = 0; i < 3; i++) | |
6326 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
6327 | ||
6328 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6329 | } | |
6330 | ||
7ff120b4 YQ |
6331 | static void |
6332 | install_alu_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6333 | struct displaced_step_closure *dsc, | |
6334 | unsigned int rd, unsigned int rn, unsigned int rm) | |
cca44b1b | 6335 | { |
cca44b1b | 6336 | ULONGEST rd_val, rn_val, rm_val; |
cca44b1b | 6337 | |
cca44b1b JB |
6338 | /* Instruction is of form: |
6339 | ||
6340 | <op><cond> rd, [rn,] rm [, <shift>] | |
6341 | ||
6342 | Rewrite as: | |
6343 | ||
6344 | Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2; | |
6345 | r0, r1, r2 <- rd, rn, rm | |
6346 | Insn: <op><cond> r0, r1, r2 [, <shift>] | |
6347 | Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3 | |
6348 | */ | |
6349 | ||
36073a92 YQ |
6350 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6351 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6352 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
6353 | rd_val = displaced_read_reg (regs, dsc, rd); | |
6354 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6355 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
6356 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6357 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6358 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
6359 | dsc->rd = rd; | |
6360 | ||
7ff120b4 YQ |
6361 | dsc->cleanup = &cleanup_alu_reg; |
6362 | } | |
6363 | ||
6364 | static int | |
6365 | arm_copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
6366 | struct displaced_step_closure *dsc) | |
6367 | { | |
6368 | unsigned int op = bits (insn, 21, 24); | |
6369 | int is_mov = (op == 0xd); | |
6370 | ||
6371 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
6372 | return arm_copy_unmodified (gdbarch, insn, "ALU reg", dsc); | |
6373 | ||
6374 | if (debug_displaced) | |
6375 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.8lx\n", | |
6376 | is_mov ? "move" : "ALU", (unsigned long) insn); | |
6377 | ||
cca44b1b JB |
6378 | if (is_mov) |
6379 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x2; | |
6380 | else | |
6381 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x10002; | |
6382 | ||
7ff120b4 YQ |
6383 | install_alu_reg (gdbarch, regs, dsc, bits (insn, 12, 15), bits (insn, 16, 19), |
6384 | bits (insn, 0, 3)); | |
cca44b1b JB |
6385 | return 0; |
6386 | } | |
6387 | ||
34518530 YQ |
6388 | static int |
6389 | thumb_copy_alu_reg (struct gdbarch *gdbarch, uint16_t insn, | |
6390 | struct regcache *regs, | |
6391 | struct displaced_step_closure *dsc) | |
6392 | { | |
6393 | unsigned rn, rm, rd; | |
6394 | ||
6395 | rd = bits (insn, 3, 6); | |
6396 | rn = (bit (insn, 7) << 3) | bits (insn, 0, 2); | |
6397 | rm = 2; | |
6398 | ||
6399 | if (rd != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) | |
6400 | return thumb_copy_unmodified_16bit (gdbarch, insn, "ALU reg", dsc); | |
6401 | ||
6402 | if (debug_displaced) | |
6403 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x\n", | |
6404 | "ALU", (unsigned short) insn); | |
6405 | ||
6406 | dsc->modinsn[0] = ((insn & 0xff00) | 0x08); | |
6407 | ||
6408 | install_alu_reg (gdbarch, regs, dsc, rd, rn, rm); | |
6409 | ||
6410 | return 0; | |
6411 | } | |
6412 | ||
cca44b1b JB |
6413 | /* Cleanup/copy arithmetic/logic insns with shifted register RHS. */ |
6414 | ||
6415 | static void | |
6e39997a | 6416 | cleanup_alu_shifted_reg (struct gdbarch *gdbarch, |
cca44b1b JB |
6417 | struct regcache *regs, |
6418 | struct displaced_step_closure *dsc) | |
6419 | { | |
36073a92 | 6420 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6421 | int i; |
6422 | ||
6423 | for (i = 0; i < 4; i++) | |
6424 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
6425 | ||
6426 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6427 | } | |
6428 | ||
7ff120b4 YQ |
6429 | static void |
6430 | install_alu_shifted_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6431 | struct displaced_step_closure *dsc, | |
6432 | unsigned int rd, unsigned int rn, unsigned int rm, | |
6433 | unsigned rs) | |
cca44b1b | 6434 | { |
7ff120b4 | 6435 | int i; |
cca44b1b | 6436 | ULONGEST rd_val, rn_val, rm_val, rs_val; |
cca44b1b | 6437 | |
cca44b1b JB |
6438 | /* Instruction is of form: |
6439 | ||
6440 | <op><cond> rd, [rn,] rm, <shift> rs | |
6441 | ||
6442 | Rewrite as: | |
6443 | ||
6444 | Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3 | |
6445 | r0, r1, r2, r3 <- rd, rn, rm, rs | |
6446 | Insn: <op><cond> r0, r1, r2, <shift> r3 | |
6447 | Cleanup: tmp5 <- r0 | |
6448 | r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4 | |
6449 | rd <- tmp5 | |
6450 | */ | |
6451 | ||
6452 | for (i = 0; i < 4; i++) | |
36073a92 | 6453 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b | 6454 | |
36073a92 YQ |
6455 | rd_val = displaced_read_reg (regs, dsc, rd); |
6456 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6457 | rm_val = displaced_read_reg (regs, dsc, rm); | |
6458 | rs_val = displaced_read_reg (regs, dsc, rs); | |
cca44b1b JB |
6459 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6460 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6461 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
6462 | displaced_write_reg (regs, dsc, 3, rs_val, CANNOT_WRITE_PC); | |
6463 | dsc->rd = rd; | |
7ff120b4 YQ |
6464 | dsc->cleanup = &cleanup_alu_shifted_reg; |
6465 | } | |
6466 | ||
6467 | static int | |
6468 | arm_copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn, | |
6469 | struct regcache *regs, | |
6470 | struct displaced_step_closure *dsc) | |
6471 | { | |
6472 | unsigned int op = bits (insn, 21, 24); | |
6473 | int is_mov = (op == 0xd); | |
6474 | unsigned int rd, rn, rm, rs; | |
6475 | ||
6476 | if (!insn_references_pc (insn, 0x000fff0ful)) | |
6477 | return arm_copy_unmodified (gdbarch, insn, "ALU shifted reg", dsc); | |
6478 | ||
6479 | if (debug_displaced) | |
6480 | fprintf_unfiltered (gdb_stdlog, "displaced: copying shifted reg %s insn " | |
6481 | "%.8lx\n", is_mov ? "move" : "ALU", | |
6482 | (unsigned long) insn); | |
6483 | ||
6484 | rn = bits (insn, 16, 19); | |
6485 | rm = bits (insn, 0, 3); | |
6486 | rs = bits (insn, 8, 11); | |
6487 | rd = bits (insn, 12, 15); | |
cca44b1b JB |
6488 | |
6489 | if (is_mov) | |
6490 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x302; | |
6491 | else | |
6492 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x10302; | |
6493 | ||
7ff120b4 | 6494 | install_alu_shifted_reg (gdbarch, regs, dsc, rd, rn, rm, rs); |
cca44b1b JB |
6495 | |
6496 | return 0; | |
6497 | } | |
6498 | ||
6499 | /* Clean up load instructions. */ | |
6500 | ||
6501 | static void | |
6e39997a | 6502 | cleanup_load (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
6503 | struct displaced_step_closure *dsc) |
6504 | { | |
6505 | ULONGEST rt_val, rt_val2 = 0, rn_val; | |
cca44b1b | 6506 | |
36073a92 | 6507 | rt_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b | 6508 | if (dsc->u.ldst.xfersize == 8) |
36073a92 YQ |
6509 | rt_val2 = displaced_read_reg (regs, dsc, 1); |
6510 | rn_val = displaced_read_reg (regs, dsc, 2); | |
cca44b1b JB |
6511 | |
6512 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
6513 | if (dsc->u.ldst.xfersize > 4) | |
6514 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6515 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
6516 | if (!dsc->u.ldst.immed) | |
6517 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
6518 | ||
6519 | /* Handle register writeback. */ | |
6520 | if (dsc->u.ldst.writeback) | |
6521 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
6522 | /* Put result in right place. */ | |
6523 | displaced_write_reg (regs, dsc, dsc->rd, rt_val, LOAD_WRITE_PC); | |
6524 | if (dsc->u.ldst.xfersize == 8) | |
6525 | displaced_write_reg (regs, dsc, dsc->rd + 1, rt_val2, LOAD_WRITE_PC); | |
6526 | } | |
6527 | ||
6528 | /* Clean up store instructions. */ | |
6529 | ||
6530 | static void | |
6e39997a | 6531 | cleanup_store (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
6532 | struct displaced_step_closure *dsc) |
6533 | { | |
36073a92 | 6534 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 2); |
cca44b1b JB |
6535 | |
6536 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
6537 | if (dsc->u.ldst.xfersize > 4) | |
6538 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6539 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
6540 | if (!dsc->u.ldst.immed) | |
6541 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
6542 | if (!dsc->u.ldst.restore_r4) | |
6543 | displaced_write_reg (regs, dsc, 4, dsc->tmp[4], CANNOT_WRITE_PC); | |
6544 | ||
6545 | /* Writeback. */ | |
6546 | if (dsc->u.ldst.writeback) | |
6547 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
6548 | } | |
6549 | ||
6550 | /* Copy "extra" load/store instructions. These are halfword/doubleword | |
6551 | transfers, which have a different encoding to byte/word transfers. */ | |
6552 | ||
6553 | static int | |
7ff120b4 YQ |
6554 | arm_copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unpriveleged, |
6555 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
6556 | { |
6557 | unsigned int op1 = bits (insn, 20, 24); | |
6558 | unsigned int op2 = bits (insn, 5, 6); | |
6559 | unsigned int rt = bits (insn, 12, 15); | |
6560 | unsigned int rn = bits (insn, 16, 19); | |
6561 | unsigned int rm = bits (insn, 0, 3); | |
6562 | char load[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1}; | |
6563 | char bytesize[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2}; | |
6564 | int immed = (op1 & 0x4) != 0; | |
6565 | int opcode; | |
6566 | ULONGEST rt_val, rt_val2 = 0, rn_val, rm_val = 0; | |
cca44b1b JB |
6567 | |
6568 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
7ff120b4 | 6569 | return arm_copy_unmodified (gdbarch, insn, "extra load/store", dsc); |
cca44b1b JB |
6570 | |
6571 | if (debug_displaced) | |
6572 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %sextra load/store " | |
6573 | "insn %.8lx\n", unpriveleged ? "unpriveleged " : "", | |
6574 | (unsigned long) insn); | |
6575 | ||
6576 | opcode = ((op2 << 2) | (op1 & 0x1) | ((op1 & 0x4) >> 1)) - 4; | |
6577 | ||
6578 | if (opcode < 0) | |
6579 | internal_error (__FILE__, __LINE__, | |
6580 | _("copy_extra_ld_st: instruction decode error")); | |
6581 | ||
36073a92 YQ |
6582 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6583 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6584 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 6585 | if (!immed) |
36073a92 | 6586 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 6587 | |
36073a92 | 6588 | rt_val = displaced_read_reg (regs, dsc, rt); |
cca44b1b | 6589 | if (bytesize[opcode] == 8) |
36073a92 YQ |
6590 | rt_val2 = displaced_read_reg (regs, dsc, rt + 1); |
6591 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 6592 | if (!immed) |
36073a92 | 6593 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6594 | |
6595 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
6596 | if (bytesize[opcode] == 8) | |
6597 | displaced_write_reg (regs, dsc, 1, rt_val2, CANNOT_WRITE_PC); | |
6598 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
6599 | if (!immed) | |
6600 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
6601 | ||
6602 | dsc->rd = rt; | |
6603 | dsc->u.ldst.xfersize = bytesize[opcode]; | |
6604 | dsc->u.ldst.rn = rn; | |
6605 | dsc->u.ldst.immed = immed; | |
6606 | dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0; | |
6607 | dsc->u.ldst.restore_r4 = 0; | |
6608 | ||
6609 | if (immed) | |
6610 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm] | |
6611 | -> | |
6612 | {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */ | |
6613 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
6614 | else | |
6615 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm] | |
6616 | -> | |
6617 | {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */ | |
6618 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
6619 | ||
6620 | dsc->cleanup = load[opcode] ? &cleanup_load : &cleanup_store; | |
6621 | ||
6622 | return 0; | |
6623 | } | |
6624 | ||
0f6f04ba | 6625 | /* Copy byte/half word/word loads and stores. */ |
cca44b1b | 6626 | |
7ff120b4 | 6627 | static void |
0f6f04ba YQ |
6628 | install_load_store (struct gdbarch *gdbarch, struct regcache *regs, |
6629 | struct displaced_step_closure *dsc, int load, | |
6630 | int immed, int writeback, int size, int usermode, | |
6631 | int rt, int rm, int rn) | |
cca44b1b | 6632 | { |
cca44b1b | 6633 | ULONGEST rt_val, rn_val, rm_val = 0; |
cca44b1b | 6634 | |
36073a92 YQ |
6635 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6636 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 6637 | if (!immed) |
36073a92 | 6638 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 6639 | if (!load) |
36073a92 | 6640 | dsc->tmp[4] = displaced_read_reg (regs, dsc, 4); |
cca44b1b | 6641 | |
36073a92 YQ |
6642 | rt_val = displaced_read_reg (regs, dsc, rt); |
6643 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 6644 | if (!immed) |
36073a92 | 6645 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6646 | |
6647 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
6648 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
6649 | if (!immed) | |
6650 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
cca44b1b | 6651 | dsc->rd = rt; |
0f6f04ba | 6652 | dsc->u.ldst.xfersize = size; |
cca44b1b JB |
6653 | dsc->u.ldst.rn = rn; |
6654 | dsc->u.ldst.immed = immed; | |
7ff120b4 | 6655 | dsc->u.ldst.writeback = writeback; |
cca44b1b JB |
6656 | |
6657 | /* To write PC we can do: | |
6658 | ||
494e194e YQ |
6659 | Before this sequence of instructions: |
6660 | r0 is the PC value got from displaced_read_reg, so r0 = from + 8; | |
6661 | r2 is the Rn value got from dispalced_read_reg. | |
6662 | ||
6663 | Insn1: push {pc} Write address of STR instruction + offset on stack | |
6664 | Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset | |
6665 | Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc | |
6666 | = addr(Insn1) + offset - addr(Insn3) - 8 | |
6667 | = offset - 16 | |
6668 | Insn4: add r4, r4, #8 r4 = offset - 8 | |
6669 | Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8 | |
6670 | = from + offset | |
6671 | Insn6: str r0, [r2, #imm] (or str r0, [r2, r3]) | |
cca44b1b JB |
6672 | |
6673 | Otherwise we don't know what value to write for PC, since the offset is | |
494e194e YQ |
6674 | architecture-dependent (sometimes PC+8, sometimes PC+12). More details |
6675 | of this can be found in Section "Saving from r15" in | |
6676 | http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */ | |
cca44b1b | 6677 | |
7ff120b4 YQ |
6678 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; |
6679 | } | |
6680 | ||
34518530 YQ |
6681 | |
6682 | static int | |
6683 | thumb2_copy_load_literal (struct gdbarch *gdbarch, uint16_t insn1, | |
6684 | uint16_t insn2, struct regcache *regs, | |
6685 | struct displaced_step_closure *dsc, int size) | |
6686 | { | |
6687 | unsigned int u_bit = bit (insn1, 7); | |
6688 | unsigned int rt = bits (insn2, 12, 15); | |
6689 | int imm12 = bits (insn2, 0, 11); | |
6690 | ULONGEST pc_val; | |
6691 | ||
6692 | if (debug_displaced) | |
6693 | fprintf_unfiltered (gdb_stdlog, | |
6694 | "displaced: copying ldr pc (0x%x) R%d %c imm12 %.4x\n", | |
6695 | (unsigned int) dsc->insn_addr, rt, u_bit ? '+' : '-', | |
6696 | imm12); | |
6697 | ||
6698 | if (!u_bit) | |
6699 | imm12 = -1 * imm12; | |
6700 | ||
6701 | /* Rewrite instruction LDR Rt imm12 into: | |
6702 | ||
6703 | Prepare: tmp[0] <- r0, tmp[1] <- r2, tmp[2] <- r3, r2 <- pc, r3 <- imm12 | |
6704 | ||
6705 | LDR R0, R2, R3, | |
6706 | ||
6707 | Cleanup: rt <- r0, r0 <- tmp[0], r2 <- tmp[1], r3 <- tmp[2]. */ | |
6708 | ||
6709 | ||
6710 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
6711 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
6712 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); | |
6713 | ||
6714 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
6715 | ||
6716 | pc_val = pc_val & 0xfffffffc; | |
6717 | ||
6718 | displaced_write_reg (regs, dsc, 2, pc_val, CANNOT_WRITE_PC); | |
6719 | displaced_write_reg (regs, dsc, 3, imm12, CANNOT_WRITE_PC); | |
6720 | ||
6721 | dsc->rd = rt; | |
6722 | ||
6723 | dsc->u.ldst.xfersize = size; | |
6724 | dsc->u.ldst.immed = 0; | |
6725 | dsc->u.ldst.writeback = 0; | |
6726 | dsc->u.ldst.restore_r4 = 0; | |
6727 | ||
6728 | /* LDR R0, R2, R3 */ | |
6729 | dsc->modinsn[0] = 0xf852; | |
6730 | dsc->modinsn[1] = 0x3; | |
6731 | dsc->numinsns = 2; | |
6732 | ||
6733 | dsc->cleanup = &cleanup_load; | |
6734 | ||
6735 | return 0; | |
6736 | } | |
6737 | ||
6738 | static int | |
6739 | thumb2_copy_load_reg_imm (struct gdbarch *gdbarch, uint16_t insn1, | |
6740 | uint16_t insn2, struct regcache *regs, | |
6741 | struct displaced_step_closure *dsc, | |
6742 | int writeback, int immed) | |
6743 | { | |
6744 | unsigned int rt = bits (insn2, 12, 15); | |
6745 | unsigned int rn = bits (insn1, 0, 3); | |
6746 | unsigned int rm = bits (insn2, 0, 3); /* Only valid if !immed. */ | |
6747 | /* In LDR (register), there is also a register Rm, which is not allowed to | |
6748 | be PC, so we don't have to check it. */ | |
6749 | ||
6750 | if (rt != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) | |
6751 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "load", | |
6752 | dsc); | |
6753 | ||
6754 | if (debug_displaced) | |
6755 | fprintf_unfiltered (gdb_stdlog, | |
6756 | "displaced: copying ldr r%d [r%d] insn %.4x%.4x\n", | |
6757 | rt, rn, insn1, insn2); | |
6758 | ||
6759 | install_load_store (gdbarch, regs, dsc, 1, immed, writeback, 4, | |
6760 | 0, rt, rm, rn); | |
6761 | ||
6762 | dsc->u.ldst.restore_r4 = 0; | |
6763 | ||
6764 | if (immed) | |
6765 | /* ldr[b]<cond> rt, [rn, #imm], etc. | |
6766 | -> | |
6767 | ldr[b]<cond> r0, [r2, #imm]. */ | |
6768 | { | |
6769 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; | |
6770 | dsc->modinsn[1] = insn2 & 0x0fff; | |
6771 | } | |
6772 | else | |
6773 | /* ldr[b]<cond> rt, [rn, rm], etc. | |
6774 | -> | |
6775 | ldr[b]<cond> r0, [r2, r3]. */ | |
6776 | { | |
6777 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; | |
6778 | dsc->modinsn[1] = (insn2 & 0x0ff0) | 0x3; | |
6779 | } | |
6780 | ||
6781 | dsc->numinsns = 2; | |
6782 | ||
6783 | return 0; | |
6784 | } | |
6785 | ||
6786 | ||
7ff120b4 YQ |
6787 | static int |
6788 | arm_copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn, | |
6789 | struct regcache *regs, | |
6790 | struct displaced_step_closure *dsc, | |
0f6f04ba | 6791 | int load, int size, int usermode) |
7ff120b4 YQ |
6792 | { |
6793 | int immed = !bit (insn, 25); | |
6794 | int writeback = (bit (insn, 24) == 0 || bit (insn, 21) != 0); | |
6795 | unsigned int rt = bits (insn, 12, 15); | |
6796 | unsigned int rn = bits (insn, 16, 19); | |
6797 | unsigned int rm = bits (insn, 0, 3); /* Only valid if !immed. */ | |
6798 | ||
6799 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
6800 | return arm_copy_unmodified (gdbarch, insn, "load/store", dsc); | |
6801 | ||
6802 | if (debug_displaced) | |
6803 | fprintf_unfiltered (gdb_stdlog, | |
6804 | "displaced: copying %s%s r%d [r%d] insn %.8lx\n", | |
0f6f04ba YQ |
6805 | load ? (size == 1 ? "ldrb" : "ldr") |
6806 | : (size == 1 ? "strb" : "str"), usermode ? "t" : "", | |
7ff120b4 YQ |
6807 | rt, rn, |
6808 | (unsigned long) insn); | |
6809 | ||
0f6f04ba YQ |
6810 | install_load_store (gdbarch, regs, dsc, load, immed, writeback, size, |
6811 | usermode, rt, rm, rn); | |
7ff120b4 | 6812 | |
bf9f652a | 6813 | if (load || rt != ARM_PC_REGNUM) |
cca44b1b JB |
6814 | { |
6815 | dsc->u.ldst.restore_r4 = 0; | |
6816 | ||
6817 | if (immed) | |
6818 | /* {ldr,str}[b]<cond> rt, [rn, #imm], etc. | |
6819 | -> | |
6820 | {ldr,str}[b]<cond> r0, [r2, #imm]. */ | |
6821 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
6822 | else | |
6823 | /* {ldr,str}[b]<cond> rt, [rn, rm], etc. | |
6824 | -> | |
6825 | {ldr,str}[b]<cond> r0, [r2, r3]. */ | |
6826 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
6827 | } | |
6828 | else | |
6829 | { | |
6830 | /* We need to use r4 as scratch. Make sure it's restored afterwards. */ | |
6831 | dsc->u.ldst.restore_r4 = 1; | |
494e194e YQ |
6832 | dsc->modinsn[0] = 0xe92d8000; /* push {pc} */ |
6833 | dsc->modinsn[1] = 0xe8bd0010; /* pop {r4} */ | |
cca44b1b JB |
6834 | dsc->modinsn[2] = 0xe044400f; /* sub r4, r4, pc. */ |
6835 | dsc->modinsn[3] = 0xe2844008; /* add r4, r4, #8. */ | |
6836 | dsc->modinsn[4] = 0xe0800004; /* add r0, r0, r4. */ | |
6837 | ||
6838 | /* As above. */ | |
6839 | if (immed) | |
6840 | dsc->modinsn[5] = (insn & 0xfff00fff) | 0x20000; | |
6841 | else | |
6842 | dsc->modinsn[5] = (insn & 0xfff00ff0) | 0x20003; | |
6843 | ||
cca44b1b JB |
6844 | dsc->numinsns = 6; |
6845 | } | |
6846 | ||
6847 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; | |
6848 | ||
6849 | return 0; | |
6850 | } | |
6851 | ||
6852 | /* Cleanup LDM instructions with fully-populated register list. This is an | |
6853 | unfortunate corner case: it's impossible to implement correctly by modifying | |
6854 | the instruction. The issue is as follows: we have an instruction, | |
6855 | ||
6856 | ldm rN, {r0-r15} | |
6857 | ||
6858 | which we must rewrite to avoid loading PC. A possible solution would be to | |
6859 | do the load in two halves, something like (with suitable cleanup | |
6860 | afterwards): | |
6861 | ||
6862 | mov r8, rN | |
6863 | ldm[id][ab] r8!, {r0-r7} | |
6864 | str r7, <temp> | |
6865 | ldm[id][ab] r8, {r7-r14} | |
6866 | <bkpt> | |
6867 | ||
6868 | but at present there's no suitable place for <temp>, since the scratch space | |
6869 | is overwritten before the cleanup routine is called. For now, we simply | |
6870 | emulate the instruction. */ | |
6871 | ||
6872 | static void | |
6873 | cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs, | |
6874 | struct displaced_step_closure *dsc) | |
6875 | { | |
cca44b1b JB |
6876 | int inc = dsc->u.block.increment; |
6877 | int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0; | |
6878 | int bump_after = dsc->u.block.before ? 0 : (inc ? 4 : -4); | |
6879 | uint32_t regmask = dsc->u.block.regmask; | |
6880 | int regno = inc ? 0 : 15; | |
6881 | CORE_ADDR xfer_addr = dsc->u.block.xfer_addr; | |
6882 | int exception_return = dsc->u.block.load && dsc->u.block.user | |
6883 | && (regmask & 0x8000) != 0; | |
36073a92 | 6884 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6885 | int do_transfer = condition_true (dsc->u.block.cond, status); |
6886 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
6887 | ||
6888 | if (!do_transfer) | |
6889 | return; | |
6890 | ||
6891 | /* If the instruction is ldm rN, {...pc}^, I don't think there's anything | |
6892 | sensible we can do here. Complain loudly. */ | |
6893 | if (exception_return) | |
6894 | error (_("Cannot single-step exception return")); | |
6895 | ||
6896 | /* We don't handle any stores here for now. */ | |
6897 | gdb_assert (dsc->u.block.load != 0); | |
6898 | ||
6899 | if (debug_displaced) | |
6900 | fprintf_unfiltered (gdb_stdlog, "displaced: emulating block transfer: " | |
6901 | "%s %s %s\n", dsc->u.block.load ? "ldm" : "stm", | |
6902 | dsc->u.block.increment ? "inc" : "dec", | |
6903 | dsc->u.block.before ? "before" : "after"); | |
6904 | ||
6905 | while (regmask) | |
6906 | { | |
6907 | uint32_t memword; | |
6908 | ||
6909 | if (inc) | |
bf9f652a | 6910 | while (regno <= ARM_PC_REGNUM && (regmask & (1 << regno)) == 0) |
cca44b1b JB |
6911 | regno++; |
6912 | else | |
6913 | while (regno >= 0 && (regmask & (1 << regno)) == 0) | |
6914 | regno--; | |
6915 | ||
6916 | xfer_addr += bump_before; | |
6917 | ||
6918 | memword = read_memory_unsigned_integer (xfer_addr, 4, byte_order); | |
6919 | displaced_write_reg (regs, dsc, regno, memword, LOAD_WRITE_PC); | |
6920 | ||
6921 | xfer_addr += bump_after; | |
6922 | ||
6923 | regmask &= ~(1 << regno); | |
6924 | } | |
6925 | ||
6926 | if (dsc->u.block.writeback) | |
6927 | displaced_write_reg (regs, dsc, dsc->u.block.rn, xfer_addr, | |
6928 | CANNOT_WRITE_PC); | |
6929 | } | |
6930 | ||
6931 | /* Clean up an STM which included the PC in the register list. */ | |
6932 | ||
6933 | static void | |
6934 | cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs, | |
6935 | struct displaced_step_closure *dsc) | |
6936 | { | |
36073a92 | 6937 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6938 | int store_executed = condition_true (dsc->u.block.cond, status); |
6939 | CORE_ADDR pc_stored_at, transferred_regs = bitcount (dsc->u.block.regmask); | |
6940 | CORE_ADDR stm_insn_addr; | |
6941 | uint32_t pc_val; | |
6942 | long offset; | |
6943 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
6944 | ||
6945 | /* If condition code fails, there's nothing else to do. */ | |
6946 | if (!store_executed) | |
6947 | return; | |
6948 | ||
6949 | if (dsc->u.block.increment) | |
6950 | { | |
6951 | pc_stored_at = dsc->u.block.xfer_addr + 4 * transferred_regs; | |
6952 | ||
6953 | if (dsc->u.block.before) | |
6954 | pc_stored_at += 4; | |
6955 | } | |
6956 | else | |
6957 | { | |
6958 | pc_stored_at = dsc->u.block.xfer_addr; | |
6959 | ||
6960 | if (dsc->u.block.before) | |
6961 | pc_stored_at -= 4; | |
6962 | } | |
6963 | ||
6964 | pc_val = read_memory_unsigned_integer (pc_stored_at, 4, byte_order); | |
6965 | stm_insn_addr = dsc->scratch_base; | |
6966 | offset = pc_val - stm_insn_addr; | |
6967 | ||
6968 | if (debug_displaced) | |
6969 | fprintf_unfiltered (gdb_stdlog, "displaced: detected PC offset %.8lx for " | |
6970 | "STM instruction\n", offset); | |
6971 | ||
6972 | /* Rewrite the stored PC to the proper value for the non-displaced original | |
6973 | instruction. */ | |
6974 | write_memory_unsigned_integer (pc_stored_at, 4, byte_order, | |
6975 | dsc->insn_addr + offset); | |
6976 | } | |
6977 | ||
6978 | /* Clean up an LDM which includes the PC in the register list. We clumped all | |
6979 | the registers in the transferred list into a contiguous range r0...rX (to | |
6980 | avoid loading PC directly and losing control of the debugged program), so we | |
6981 | must undo that here. */ | |
6982 | ||
6983 | static void | |
6e39997a | 6984 | cleanup_block_load_pc (struct gdbarch *gdbarch, |
cca44b1b JB |
6985 | struct regcache *regs, |
6986 | struct displaced_step_closure *dsc) | |
6987 | { | |
36073a92 | 6988 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
22e048c9 | 6989 | int load_executed = condition_true (dsc->u.block.cond, status); |
bf9f652a | 6990 | unsigned int mask = dsc->u.block.regmask, write_reg = ARM_PC_REGNUM; |
cca44b1b JB |
6991 | unsigned int regs_loaded = bitcount (mask); |
6992 | unsigned int num_to_shuffle = regs_loaded, clobbered; | |
6993 | ||
6994 | /* The method employed here will fail if the register list is fully populated | |
6995 | (we need to avoid loading PC directly). */ | |
6996 | gdb_assert (num_to_shuffle < 16); | |
6997 | ||
6998 | if (!load_executed) | |
6999 | return; | |
7000 | ||
7001 | clobbered = (1 << num_to_shuffle) - 1; | |
7002 | ||
7003 | while (num_to_shuffle > 0) | |
7004 | { | |
7005 | if ((mask & (1 << write_reg)) != 0) | |
7006 | { | |
7007 | unsigned int read_reg = num_to_shuffle - 1; | |
7008 | ||
7009 | if (read_reg != write_reg) | |
7010 | { | |
36073a92 | 7011 | ULONGEST rval = displaced_read_reg (regs, dsc, read_reg); |
cca44b1b JB |
7012 | displaced_write_reg (regs, dsc, write_reg, rval, LOAD_WRITE_PC); |
7013 | if (debug_displaced) | |
7014 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: move " | |
7015 | "loaded register r%d to r%d\n"), read_reg, | |
7016 | write_reg); | |
7017 | } | |
7018 | else if (debug_displaced) | |
7019 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: register " | |
7020 | "r%d already in the right place\n"), | |
7021 | write_reg); | |
7022 | ||
7023 | clobbered &= ~(1 << write_reg); | |
7024 | ||
7025 | num_to_shuffle--; | |
7026 | } | |
7027 | ||
7028 | write_reg--; | |
7029 | } | |
7030 | ||
7031 | /* Restore any registers we scribbled over. */ | |
7032 | for (write_reg = 0; clobbered != 0; write_reg++) | |
7033 | { | |
7034 | if ((clobbered & (1 << write_reg)) != 0) | |
7035 | { | |
7036 | displaced_write_reg (regs, dsc, write_reg, dsc->tmp[write_reg], | |
7037 | CANNOT_WRITE_PC); | |
7038 | if (debug_displaced) | |
7039 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: restored " | |
7040 | "clobbered register r%d\n"), write_reg); | |
7041 | clobbered &= ~(1 << write_reg); | |
7042 | } | |
7043 | } | |
7044 | ||
7045 | /* Perform register writeback manually. */ | |
7046 | if (dsc->u.block.writeback) | |
7047 | { | |
7048 | ULONGEST new_rn_val = dsc->u.block.xfer_addr; | |
7049 | ||
7050 | if (dsc->u.block.increment) | |
7051 | new_rn_val += regs_loaded * 4; | |
7052 | else | |
7053 | new_rn_val -= regs_loaded * 4; | |
7054 | ||
7055 | displaced_write_reg (regs, dsc, dsc->u.block.rn, new_rn_val, | |
7056 | CANNOT_WRITE_PC); | |
7057 | } | |
7058 | } | |
7059 | ||
7060 | /* Handle ldm/stm, apart from some tricky cases which are unlikely to occur | |
7061 | in user-level code (in particular exception return, ldm rn, {...pc}^). */ | |
7062 | ||
7063 | static int | |
7ff120b4 YQ |
7064 | arm_copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn, |
7065 | struct regcache *regs, | |
7066 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7067 | { |
7068 | int load = bit (insn, 20); | |
7069 | int user = bit (insn, 22); | |
7070 | int increment = bit (insn, 23); | |
7071 | int before = bit (insn, 24); | |
7072 | int writeback = bit (insn, 21); | |
7073 | int rn = bits (insn, 16, 19); | |
cca44b1b | 7074 | |
0963b4bd MS |
7075 | /* Block transfers which don't mention PC can be run directly |
7076 | out-of-line. */ | |
bf9f652a | 7077 | if (rn != ARM_PC_REGNUM && (insn & 0x8000) == 0) |
7ff120b4 | 7078 | return arm_copy_unmodified (gdbarch, insn, "ldm/stm", dsc); |
cca44b1b | 7079 | |
bf9f652a | 7080 | if (rn == ARM_PC_REGNUM) |
cca44b1b | 7081 | { |
0963b4bd MS |
7082 | warning (_("displaced: Unpredictable LDM or STM with " |
7083 | "base register r15")); | |
7ff120b4 | 7084 | return arm_copy_unmodified (gdbarch, insn, "unpredictable ldm/stm", dsc); |
cca44b1b JB |
7085 | } |
7086 | ||
7087 | if (debug_displaced) | |
7088 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " | |
7089 | "%.8lx\n", (unsigned long) insn); | |
7090 | ||
36073a92 | 7091 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); |
cca44b1b JB |
7092 | dsc->u.block.rn = rn; |
7093 | ||
7094 | dsc->u.block.load = load; | |
7095 | dsc->u.block.user = user; | |
7096 | dsc->u.block.increment = increment; | |
7097 | dsc->u.block.before = before; | |
7098 | dsc->u.block.writeback = writeback; | |
7099 | dsc->u.block.cond = bits (insn, 28, 31); | |
7100 | ||
7101 | dsc->u.block.regmask = insn & 0xffff; | |
7102 | ||
7103 | if (load) | |
7104 | { | |
7105 | if ((insn & 0xffff) == 0xffff) | |
7106 | { | |
7107 | /* LDM with a fully-populated register list. This case is | |
7108 | particularly tricky. Implement for now by fully emulating the | |
7109 | instruction (which might not behave perfectly in all cases, but | |
7110 | these instructions should be rare enough for that not to matter | |
7111 | too much). */ | |
7112 | dsc->modinsn[0] = ARM_NOP; | |
7113 | ||
7114 | dsc->cleanup = &cleanup_block_load_all; | |
7115 | } | |
7116 | else | |
7117 | { | |
7118 | /* LDM of a list of registers which includes PC. Implement by | |
7119 | rewriting the list of registers to be transferred into a | |
7120 | contiguous chunk r0...rX before doing the transfer, then shuffling | |
7121 | registers into the correct places in the cleanup routine. */ | |
7122 | unsigned int regmask = insn & 0xffff; | |
7123 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; | |
7124 | unsigned int to = 0, from = 0, i, new_rn; | |
7125 | ||
7126 | for (i = 0; i < num_in_list; i++) | |
36073a92 | 7127 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b JB |
7128 | |
7129 | /* Writeback makes things complicated. We need to avoid clobbering | |
7130 | the base register with one of the registers in our modified | |
7131 | register list, but just using a different register can't work in | |
7132 | all cases, e.g.: | |
7133 | ||
7134 | ldm r14!, {r0-r13,pc} | |
7135 | ||
7136 | which would need to be rewritten as: | |
7137 | ||
7138 | ldm rN!, {r0-r14} | |
7139 | ||
7140 | but that can't work, because there's no free register for N. | |
7141 | ||
7142 | Solve this by turning off the writeback bit, and emulating | |
7143 | writeback manually in the cleanup routine. */ | |
7144 | ||
7145 | if (writeback) | |
7146 | insn &= ~(1 << 21); | |
7147 | ||
7148 | new_regmask = (1 << num_in_list) - 1; | |
7149 | ||
7150 | if (debug_displaced) | |
7151 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
7152 | "{..., pc}: original reg list %.4x, modified " | |
7153 | "list %.4x\n"), rn, writeback ? "!" : "", | |
7154 | (int) insn & 0xffff, new_regmask); | |
7155 | ||
7156 | dsc->modinsn[0] = (insn & ~0xffff) | (new_regmask & 0xffff); | |
7157 | ||
7158 | dsc->cleanup = &cleanup_block_load_pc; | |
7159 | } | |
7160 | } | |
7161 | else | |
7162 | { | |
7163 | /* STM of a list of registers which includes PC. Run the instruction | |
7164 | as-is, but out of line: this will store the wrong value for the PC, | |
7165 | so we must manually fix up the memory in the cleanup routine. | |
7166 | Doing things this way has the advantage that we can auto-detect | |
7167 | the offset of the PC write (which is architecture-dependent) in | |
7168 | the cleanup routine. */ | |
7169 | dsc->modinsn[0] = insn; | |
7170 | ||
7171 | dsc->cleanup = &cleanup_block_store_pc; | |
7172 | } | |
7173 | ||
7174 | return 0; | |
7175 | } | |
7176 | ||
34518530 YQ |
7177 | static int |
7178 | thumb2_copy_block_xfer (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
7179 | struct regcache *regs, | |
7180 | struct displaced_step_closure *dsc) | |
cca44b1b | 7181 | { |
34518530 YQ |
7182 | int rn = bits (insn1, 0, 3); |
7183 | int load = bit (insn1, 4); | |
7184 | int writeback = bit (insn1, 5); | |
cca44b1b | 7185 | |
34518530 YQ |
7186 | /* Block transfers which don't mention PC can be run directly |
7187 | out-of-line. */ | |
7188 | if (rn != ARM_PC_REGNUM && (insn2 & 0x8000) == 0) | |
7189 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ldm/stm", dsc); | |
7ff120b4 | 7190 | |
34518530 YQ |
7191 | if (rn == ARM_PC_REGNUM) |
7192 | { | |
7193 | warning (_("displaced: Unpredictable LDM or STM with " | |
7194 | "base register r15")); | |
7195 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7196 | "unpredictable ldm/stm", dsc); | |
7197 | } | |
cca44b1b JB |
7198 | |
7199 | if (debug_displaced) | |
34518530 YQ |
7200 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " |
7201 | "%.4x%.4x\n", insn1, insn2); | |
cca44b1b | 7202 | |
34518530 YQ |
7203 | /* Clear bit 13, since it should be always zero. */ |
7204 | dsc->u.block.regmask = (insn2 & 0xdfff); | |
7205 | dsc->u.block.rn = rn; | |
cca44b1b | 7206 | |
34518530 YQ |
7207 | dsc->u.block.load = load; |
7208 | dsc->u.block.user = 0; | |
7209 | dsc->u.block.increment = bit (insn1, 7); | |
7210 | dsc->u.block.before = bit (insn1, 8); | |
7211 | dsc->u.block.writeback = writeback; | |
7212 | dsc->u.block.cond = INST_AL; | |
7213 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 7214 | |
34518530 YQ |
7215 | if (load) |
7216 | { | |
7217 | if (dsc->u.block.regmask == 0xffff) | |
7218 | { | |
7219 | /* This branch is impossible to happen. */ | |
7220 | gdb_assert (0); | |
7221 | } | |
7222 | else | |
7223 | { | |
7224 | unsigned int regmask = dsc->u.block.regmask; | |
7225 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; | |
7226 | unsigned int to = 0, from = 0, i, new_rn; | |
7227 | ||
7228 | for (i = 0; i < num_in_list; i++) | |
7229 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); | |
7230 | ||
7231 | if (writeback) | |
7232 | insn1 &= ~(1 << 5); | |
7233 | ||
7234 | new_regmask = (1 << num_in_list) - 1; | |
7235 | ||
7236 | if (debug_displaced) | |
7237 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
7238 | "{..., pc}: original reg list %.4x, modified " | |
7239 | "list %.4x\n"), rn, writeback ? "!" : "", | |
7240 | (int) dsc->u.block.regmask, new_regmask); | |
7241 | ||
7242 | dsc->modinsn[0] = insn1; | |
7243 | dsc->modinsn[1] = (new_regmask & 0xffff); | |
7244 | dsc->numinsns = 2; | |
7245 | ||
7246 | dsc->cleanup = &cleanup_block_load_pc; | |
7247 | } | |
7248 | } | |
7249 | else | |
7250 | { | |
7251 | dsc->modinsn[0] = insn1; | |
7252 | dsc->modinsn[1] = insn2; | |
7253 | dsc->numinsns = 2; | |
7254 | dsc->cleanup = &cleanup_block_store_pc; | |
7255 | } | |
7256 | return 0; | |
7257 | } | |
7258 | ||
7259 | /* Cleanup/copy SVC (SWI) instructions. These two functions are overridden | |
7260 | for Linux, where some SVC instructions must be treated specially. */ | |
7261 | ||
7262 | static void | |
7263 | cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs, | |
7264 | struct displaced_step_closure *dsc) | |
7265 | { | |
7266 | CORE_ADDR resume_addr = dsc->insn_addr + dsc->insn_size; | |
7267 | ||
7268 | if (debug_displaced) | |
7269 | fprintf_unfiltered (gdb_stdlog, "displaced: cleanup for svc, resume at " | |
7270 | "%.8lx\n", (unsigned long) resume_addr); | |
7271 | ||
7272 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, resume_addr, BRANCH_WRITE_PC); | |
7273 | } | |
7274 | ||
7275 | ||
7276 | /* Common copy routine for svc instruciton. */ | |
7277 | ||
7278 | static int | |
7279 | install_svc (struct gdbarch *gdbarch, struct regcache *regs, | |
7280 | struct displaced_step_closure *dsc) | |
7281 | { | |
7282 | /* Preparation: none. | |
7283 | Insn: unmodified svc. | |
7284 | Cleanup: pc <- insn_addr + insn_size. */ | |
7285 | ||
7286 | /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next | |
7287 | instruction. */ | |
7288 | dsc->wrote_to_pc = 1; | |
7289 | ||
7290 | /* Allow OS-specific code to override SVC handling. */ | |
bd18283a YQ |
7291 | if (dsc->u.svc.copy_svc_os) |
7292 | return dsc->u.svc.copy_svc_os (gdbarch, regs, dsc); | |
7293 | else | |
7294 | { | |
7295 | dsc->cleanup = &cleanup_svc; | |
7296 | return 0; | |
7297 | } | |
34518530 YQ |
7298 | } |
7299 | ||
7300 | static int | |
7301 | arm_copy_svc (struct gdbarch *gdbarch, uint32_t insn, | |
7302 | struct regcache *regs, struct displaced_step_closure *dsc) | |
7303 | { | |
7304 | ||
7305 | if (debug_displaced) | |
7306 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.8lx\n", | |
7307 | (unsigned long) insn); | |
7308 | ||
7309 | dsc->modinsn[0] = insn; | |
7310 | ||
7311 | return install_svc (gdbarch, regs, dsc); | |
7312 | } | |
7313 | ||
7314 | static int | |
7315 | thumb_copy_svc (struct gdbarch *gdbarch, uint16_t insn, | |
7316 | struct regcache *regs, struct displaced_step_closure *dsc) | |
7317 | { | |
7318 | ||
7319 | if (debug_displaced) | |
7320 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.4x\n", | |
7321 | insn); | |
bd18283a | 7322 | |
34518530 YQ |
7323 | dsc->modinsn[0] = insn; |
7324 | ||
7325 | return install_svc (gdbarch, regs, dsc); | |
cca44b1b JB |
7326 | } |
7327 | ||
7328 | /* Copy undefined instructions. */ | |
7329 | ||
7330 | static int | |
7ff120b4 YQ |
7331 | arm_copy_undef (struct gdbarch *gdbarch, uint32_t insn, |
7332 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7333 | { |
7334 | if (debug_displaced) | |
0963b4bd MS |
7335 | fprintf_unfiltered (gdb_stdlog, |
7336 | "displaced: copying undefined insn %.8lx\n", | |
cca44b1b JB |
7337 | (unsigned long) insn); |
7338 | ||
7339 | dsc->modinsn[0] = insn; | |
7340 | ||
7341 | return 0; | |
7342 | } | |
7343 | ||
34518530 YQ |
7344 | static int |
7345 | thumb_32bit_copy_undef (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
7346 | struct displaced_step_closure *dsc) | |
7347 | { | |
7348 | ||
7349 | if (debug_displaced) | |
7350 | fprintf_unfiltered (gdb_stdlog, "displaced: copying undefined insn " | |
7351 | "%.4x %.4x\n", (unsigned short) insn1, | |
7352 | (unsigned short) insn2); | |
7353 | ||
7354 | dsc->modinsn[0] = insn1; | |
7355 | dsc->modinsn[1] = insn2; | |
7356 | dsc->numinsns = 2; | |
7357 | ||
7358 | return 0; | |
7359 | } | |
7360 | ||
cca44b1b JB |
7361 | /* Copy unpredictable instructions. */ |
7362 | ||
7363 | static int | |
7ff120b4 YQ |
7364 | arm_copy_unpred (struct gdbarch *gdbarch, uint32_t insn, |
7365 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7366 | { |
7367 | if (debug_displaced) | |
7368 | fprintf_unfiltered (gdb_stdlog, "displaced: copying unpredictable insn " | |
7369 | "%.8lx\n", (unsigned long) insn); | |
7370 | ||
7371 | dsc->modinsn[0] = insn; | |
7372 | ||
7373 | return 0; | |
7374 | } | |
7375 | ||
7376 | /* The decode_* functions are instruction decoding helpers. They mostly follow | |
7377 | the presentation in the ARM ARM. */ | |
7378 | ||
7379 | static int | |
7ff120b4 YQ |
7380 | arm_decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn, |
7381 | struct regcache *regs, | |
7382 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7383 | { |
7384 | unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7); | |
7385 | unsigned int rn = bits (insn, 16, 19); | |
7386 | ||
7387 | if (op1 == 0x10 && (op2 & 0x2) == 0x0 && (rn & 0xe) == 0x0) | |
7ff120b4 | 7388 | return arm_copy_unmodified (gdbarch, insn, "cps", dsc); |
cca44b1b | 7389 | else if (op1 == 0x10 && op2 == 0x0 && (rn & 0xe) == 0x1) |
7ff120b4 | 7390 | return arm_copy_unmodified (gdbarch, insn, "setend", dsc); |
cca44b1b | 7391 | else if ((op1 & 0x60) == 0x20) |
7ff120b4 | 7392 | return arm_copy_unmodified (gdbarch, insn, "neon dataproc", dsc); |
cca44b1b | 7393 | else if ((op1 & 0x71) == 0x40) |
7ff120b4 YQ |
7394 | return arm_copy_unmodified (gdbarch, insn, "neon elt/struct load/store", |
7395 | dsc); | |
cca44b1b | 7396 | else if ((op1 & 0x77) == 0x41) |
7ff120b4 | 7397 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
cca44b1b | 7398 | else if ((op1 & 0x77) == 0x45) |
7ff120b4 | 7399 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pli. */ |
cca44b1b JB |
7400 | else if ((op1 & 0x77) == 0x51) |
7401 | { | |
7402 | if (rn != 0xf) | |
7ff120b4 | 7403 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
cca44b1b | 7404 | else |
7ff120b4 | 7405 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b JB |
7406 | } |
7407 | else if ((op1 & 0x77) == 0x55) | |
7ff120b4 | 7408 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
cca44b1b JB |
7409 | else if (op1 == 0x57) |
7410 | switch (op2) | |
7411 | { | |
7ff120b4 YQ |
7412 | case 0x1: return arm_copy_unmodified (gdbarch, insn, "clrex", dsc); |
7413 | case 0x4: return arm_copy_unmodified (gdbarch, insn, "dsb", dsc); | |
7414 | case 0x5: return arm_copy_unmodified (gdbarch, insn, "dmb", dsc); | |
7415 | case 0x6: return arm_copy_unmodified (gdbarch, insn, "isb", dsc); | |
7416 | default: return arm_copy_unpred (gdbarch, insn, dsc); | |
cca44b1b JB |
7417 | } |
7418 | else if ((op1 & 0x63) == 0x43) | |
7ff120b4 | 7419 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b JB |
7420 | else if ((op2 & 0x1) == 0x0) |
7421 | switch (op1 & ~0x80) | |
7422 | { | |
7423 | case 0x61: | |
7ff120b4 | 7424 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
cca44b1b | 7425 | case 0x65: |
7ff120b4 | 7426 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); /* pli reg. */ |
cca44b1b JB |
7427 | case 0x71: case 0x75: |
7428 | /* pld/pldw reg. */ | |
7ff120b4 | 7429 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7430 | case 0x63: case 0x67: case 0x73: case 0x77: |
7ff120b4 | 7431 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b | 7432 | default: |
7ff120b4 | 7433 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7434 | } |
7435 | else | |
7ff120b4 | 7436 | return arm_copy_undef (gdbarch, insn, dsc); /* Probably unreachable. */ |
cca44b1b JB |
7437 | } |
7438 | ||
7439 | static int | |
7ff120b4 YQ |
7440 | arm_decode_unconditional (struct gdbarch *gdbarch, uint32_t insn, |
7441 | struct regcache *regs, | |
7442 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7443 | { |
7444 | if (bit (insn, 27) == 0) | |
7ff120b4 | 7445 | return arm_decode_misc_memhint_neon (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7446 | /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */ |
7447 | else switch (((insn & 0x7000000) >> 23) | ((insn & 0x100000) >> 20)) | |
7448 | { | |
7449 | case 0x0: case 0x2: | |
7ff120b4 | 7450 | return arm_copy_unmodified (gdbarch, insn, "srs", dsc); |
cca44b1b JB |
7451 | |
7452 | case 0x1: case 0x3: | |
7ff120b4 | 7453 | return arm_copy_unmodified (gdbarch, insn, "rfe", dsc); |
cca44b1b JB |
7454 | |
7455 | case 0x4: case 0x5: case 0x6: case 0x7: | |
7ff120b4 | 7456 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7457 | |
7458 | case 0x8: | |
7459 | switch ((insn & 0xe00000) >> 21) | |
7460 | { | |
7461 | case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7: | |
7462 | /* stc/stc2. */ | |
7ff120b4 | 7463 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7464 | |
7465 | case 0x2: | |
7ff120b4 | 7466 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
cca44b1b JB |
7467 | |
7468 | default: | |
7ff120b4 | 7469 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7470 | } |
7471 | ||
7472 | case 0x9: | |
7473 | { | |
7474 | int rn_f = (bits (insn, 16, 19) == 0xf); | |
7475 | switch ((insn & 0xe00000) >> 21) | |
7476 | { | |
7477 | case 0x1: case 0x3: | |
7478 | /* ldc/ldc2 imm (undefined for rn == pc). */ | |
7ff120b4 YQ |
7479 | return rn_f ? arm_copy_undef (gdbarch, insn, dsc) |
7480 | : arm_copy_copro_load_store (gdbarch, insn, regs, dsc); | |
cca44b1b JB |
7481 | |
7482 | case 0x2: | |
7ff120b4 | 7483 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
cca44b1b JB |
7484 | |
7485 | case 0x4: case 0x5: case 0x6: case 0x7: | |
7486 | /* ldc/ldc2 lit (undefined for rn != pc). */ | |
7ff120b4 YQ |
7487 | return rn_f ? arm_copy_copro_load_store (gdbarch, insn, regs, dsc) |
7488 | : arm_copy_undef (gdbarch, insn, dsc); | |
cca44b1b JB |
7489 | |
7490 | default: | |
7ff120b4 | 7491 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7492 | } |
7493 | } | |
7494 | ||
7495 | case 0xa: | |
7ff120b4 | 7496 | return arm_copy_unmodified (gdbarch, insn, "stc/stc2", dsc); |
cca44b1b JB |
7497 | |
7498 | case 0xb: | |
7499 | if (bits (insn, 16, 19) == 0xf) | |
7500 | /* ldc/ldc2 lit. */ | |
7ff120b4 | 7501 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b | 7502 | else |
7ff120b4 | 7503 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7504 | |
7505 | case 0xc: | |
7506 | if (bit (insn, 4)) | |
7ff120b4 | 7507 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
cca44b1b | 7508 | else |
7ff120b4 | 7509 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7510 | |
7511 | case 0xd: | |
7512 | if (bit (insn, 4)) | |
7ff120b4 | 7513 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
cca44b1b | 7514 | else |
7ff120b4 | 7515 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7516 | |
7517 | default: | |
7ff120b4 | 7518 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7519 | } |
7520 | } | |
7521 | ||
7522 | /* Decode miscellaneous instructions in dp/misc encoding space. */ | |
7523 | ||
7524 | static int | |
7ff120b4 YQ |
7525 | arm_decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn, |
7526 | struct regcache *regs, | |
7527 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7528 | { |
7529 | unsigned int op2 = bits (insn, 4, 6); | |
7530 | unsigned int op = bits (insn, 21, 22); | |
7531 | unsigned int op1 = bits (insn, 16, 19); | |
7532 | ||
7533 | switch (op2) | |
7534 | { | |
7535 | case 0x0: | |
7ff120b4 | 7536 | return arm_copy_unmodified (gdbarch, insn, "mrs/msr", dsc); |
cca44b1b JB |
7537 | |
7538 | case 0x1: | |
7539 | if (op == 0x1) /* bx. */ | |
7ff120b4 | 7540 | return arm_copy_bx_blx_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7541 | else if (op == 0x3) |
7ff120b4 | 7542 | return arm_copy_unmodified (gdbarch, insn, "clz", dsc); |
cca44b1b | 7543 | else |
7ff120b4 | 7544 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7545 | |
7546 | case 0x2: | |
7547 | if (op == 0x1) | |
7548 | /* Not really supported. */ | |
7ff120b4 | 7549 | return arm_copy_unmodified (gdbarch, insn, "bxj", dsc); |
cca44b1b | 7550 | else |
7ff120b4 | 7551 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7552 | |
7553 | case 0x3: | |
7554 | if (op == 0x1) | |
7ff120b4 | 7555 | return arm_copy_bx_blx_reg (gdbarch, insn, |
0963b4bd | 7556 | regs, dsc); /* blx register. */ |
cca44b1b | 7557 | else |
7ff120b4 | 7558 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7559 | |
7560 | case 0x5: | |
7ff120b4 | 7561 | return arm_copy_unmodified (gdbarch, insn, "saturating add/sub", dsc); |
cca44b1b JB |
7562 | |
7563 | case 0x7: | |
7564 | if (op == 0x1) | |
7ff120b4 | 7565 | return arm_copy_unmodified (gdbarch, insn, "bkpt", dsc); |
cca44b1b JB |
7566 | else if (op == 0x3) |
7567 | /* Not really supported. */ | |
7ff120b4 | 7568 | return arm_copy_unmodified (gdbarch, insn, "smc", dsc); |
cca44b1b JB |
7569 | |
7570 | default: | |
7ff120b4 | 7571 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7572 | } |
7573 | } | |
7574 | ||
7575 | static int | |
7ff120b4 YQ |
7576 | arm_decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn, |
7577 | struct regcache *regs, | |
7578 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7579 | { |
7580 | if (bit (insn, 25)) | |
7581 | switch (bits (insn, 20, 24)) | |
7582 | { | |
7583 | case 0x10: | |
7ff120b4 | 7584 | return arm_copy_unmodified (gdbarch, insn, "movw", dsc); |
cca44b1b JB |
7585 | |
7586 | case 0x14: | |
7ff120b4 | 7587 | return arm_copy_unmodified (gdbarch, insn, "movt", dsc); |
cca44b1b JB |
7588 | |
7589 | case 0x12: case 0x16: | |
7ff120b4 | 7590 | return arm_copy_unmodified (gdbarch, insn, "msr imm", dsc); |
cca44b1b JB |
7591 | |
7592 | default: | |
7ff120b4 | 7593 | return arm_copy_alu_imm (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7594 | } |
7595 | else | |
7596 | { | |
7597 | uint32_t op1 = bits (insn, 20, 24), op2 = bits (insn, 4, 7); | |
7598 | ||
7599 | if ((op1 & 0x19) != 0x10 && (op2 & 0x1) == 0x0) | |
7ff120b4 | 7600 | return arm_copy_alu_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7601 | else if ((op1 & 0x19) != 0x10 && (op2 & 0x9) == 0x1) |
7ff120b4 | 7602 | return arm_copy_alu_shifted_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7603 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x8) == 0x0) |
7ff120b4 | 7604 | return arm_decode_miscellaneous (gdbarch, insn, regs, dsc); |
cca44b1b | 7605 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x9) == 0x8) |
7ff120b4 | 7606 | return arm_copy_unmodified (gdbarch, insn, "halfword mul/mla", dsc); |
cca44b1b | 7607 | else if ((op1 & 0x10) == 0x00 && op2 == 0x9) |
7ff120b4 | 7608 | return arm_copy_unmodified (gdbarch, insn, "mul/mla", dsc); |
cca44b1b | 7609 | else if ((op1 & 0x10) == 0x10 && op2 == 0x9) |
7ff120b4 | 7610 | return arm_copy_unmodified (gdbarch, insn, "synch", dsc); |
cca44b1b JB |
7611 | else if (op2 == 0xb || (op2 & 0xd) == 0xd) |
7612 | /* 2nd arg means "unpriveleged". */ | |
7ff120b4 YQ |
7613 | return arm_copy_extra_ld_st (gdbarch, insn, (op1 & 0x12) == 0x02, regs, |
7614 | dsc); | |
cca44b1b JB |
7615 | } |
7616 | ||
7617 | /* Should be unreachable. */ | |
7618 | return 1; | |
7619 | } | |
7620 | ||
7621 | static int | |
7ff120b4 YQ |
7622 | arm_decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn, |
7623 | struct regcache *regs, | |
7624 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7625 | { |
7626 | int a = bit (insn, 25), b = bit (insn, 4); | |
7627 | uint32_t op1 = bits (insn, 20, 24); | |
7628 | int rn_f = bits (insn, 16, 19) == 0xf; | |
7629 | ||
7630 | if ((!a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02) | |
7631 | || (a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02 && !b)) | |
0f6f04ba | 7632 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 0); |
cca44b1b JB |
7633 | else if ((!a && (op1 & 0x17) == 0x02) |
7634 | || (a && (op1 & 0x17) == 0x02 && !b)) | |
0f6f04ba | 7635 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 1); |
cca44b1b JB |
7636 | else if ((!a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03) |
7637 | || (a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03 && !b)) | |
0f6f04ba | 7638 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 0); |
cca44b1b JB |
7639 | else if ((!a && (op1 & 0x17) == 0x03) |
7640 | || (a && (op1 & 0x17) == 0x03 && !b)) | |
0f6f04ba | 7641 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 1); |
cca44b1b JB |
7642 | else if ((!a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06) |
7643 | || (a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06 && !b)) | |
7ff120b4 | 7644 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 0); |
cca44b1b JB |
7645 | else if ((!a && (op1 & 0x17) == 0x06) |
7646 | || (a && (op1 & 0x17) == 0x06 && !b)) | |
7ff120b4 | 7647 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 1); |
cca44b1b JB |
7648 | else if ((!a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07) |
7649 | || (a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07 && !b)) | |
7ff120b4 | 7650 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 0); |
cca44b1b JB |
7651 | else if ((!a && (op1 & 0x17) == 0x07) |
7652 | || (a && (op1 & 0x17) == 0x07 && !b)) | |
7ff120b4 | 7653 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 1); |
cca44b1b JB |
7654 | |
7655 | /* Should be unreachable. */ | |
7656 | return 1; | |
7657 | } | |
7658 | ||
7659 | static int | |
7ff120b4 YQ |
7660 | arm_decode_media (struct gdbarch *gdbarch, uint32_t insn, |
7661 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7662 | { |
7663 | switch (bits (insn, 20, 24)) | |
7664 | { | |
7665 | case 0x00: case 0x01: case 0x02: case 0x03: | |
7ff120b4 | 7666 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub signed", dsc); |
cca44b1b JB |
7667 | |
7668 | case 0x04: case 0x05: case 0x06: case 0x07: | |
7ff120b4 | 7669 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub unsigned", dsc); |
cca44b1b JB |
7670 | |
7671 | case 0x08: case 0x09: case 0x0a: case 0x0b: | |
7672 | case 0x0c: case 0x0d: case 0x0e: case 0x0f: | |
7ff120b4 | 7673 | return arm_copy_unmodified (gdbarch, insn, |
cca44b1b JB |
7674 | "decode/pack/unpack/saturate/reverse", dsc); |
7675 | ||
7676 | case 0x18: | |
7677 | if (bits (insn, 5, 7) == 0) /* op2. */ | |
7678 | { | |
7679 | if (bits (insn, 12, 15) == 0xf) | |
7ff120b4 | 7680 | return arm_copy_unmodified (gdbarch, insn, "usad8", dsc); |
cca44b1b | 7681 | else |
7ff120b4 | 7682 | return arm_copy_unmodified (gdbarch, insn, "usada8", dsc); |
cca44b1b JB |
7683 | } |
7684 | else | |
7ff120b4 | 7685 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7686 | |
7687 | case 0x1a: case 0x1b: | |
7688 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
7ff120b4 | 7689 | return arm_copy_unmodified (gdbarch, insn, "sbfx", dsc); |
cca44b1b | 7690 | else |
7ff120b4 | 7691 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7692 | |
7693 | case 0x1c: case 0x1d: | |
7694 | if (bits (insn, 5, 6) == 0x0) /* op2[1:0]. */ | |
7695 | { | |
7696 | if (bits (insn, 0, 3) == 0xf) | |
7ff120b4 | 7697 | return arm_copy_unmodified (gdbarch, insn, "bfc", dsc); |
cca44b1b | 7698 | else |
7ff120b4 | 7699 | return arm_copy_unmodified (gdbarch, insn, "bfi", dsc); |
cca44b1b JB |
7700 | } |
7701 | else | |
7ff120b4 | 7702 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7703 | |
7704 | case 0x1e: case 0x1f: | |
7705 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
7ff120b4 | 7706 | return arm_copy_unmodified (gdbarch, insn, "ubfx", dsc); |
cca44b1b | 7707 | else |
7ff120b4 | 7708 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7709 | } |
7710 | ||
7711 | /* Should be unreachable. */ | |
7712 | return 1; | |
7713 | } | |
7714 | ||
7715 | static int | |
7ff120b4 YQ |
7716 | arm_decode_b_bl_ldmstm (struct gdbarch *gdbarch, int32_t insn, |
7717 | struct regcache *regs, | |
7718 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7719 | { |
7720 | if (bit (insn, 25)) | |
7ff120b4 | 7721 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
cca44b1b | 7722 | else |
7ff120b4 | 7723 | return arm_copy_block_xfer (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7724 | } |
7725 | ||
7726 | static int | |
7ff120b4 YQ |
7727 | arm_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn, |
7728 | struct regcache *regs, | |
7729 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7730 | { |
7731 | unsigned int opcode = bits (insn, 20, 24); | |
7732 | ||
7733 | switch (opcode) | |
7734 | { | |
7735 | case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */ | |
7ff120b4 | 7736 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon mrrc/mcrr", dsc); |
cca44b1b JB |
7737 | |
7738 | case 0x08: case 0x0a: case 0x0c: case 0x0e: | |
7739 | case 0x12: case 0x16: | |
7ff120b4 | 7740 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vstm/vpush", dsc); |
cca44b1b JB |
7741 | |
7742 | case 0x09: case 0x0b: case 0x0d: case 0x0f: | |
7743 | case 0x13: case 0x17: | |
7ff120b4 | 7744 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vldm/vpop", dsc); |
cca44b1b JB |
7745 | |
7746 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
7747 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
7748 | /* Note: no writeback for these instructions. Bit 25 will always be | |
7749 | zero though (via caller), so the following works OK. */ | |
7ff120b4 | 7750 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7751 | } |
7752 | ||
7753 | /* Should be unreachable. */ | |
7754 | return 1; | |
7755 | } | |
7756 | ||
34518530 YQ |
7757 | /* Decode shifted register instructions. */ |
7758 | ||
7759 | static int | |
7760 | thumb2_decode_dp_shift_reg (struct gdbarch *gdbarch, uint16_t insn1, | |
7761 | uint16_t insn2, struct regcache *regs, | |
7762 | struct displaced_step_closure *dsc) | |
7763 | { | |
7764 | /* PC is only allowed to be used in instruction MOV. */ | |
7765 | ||
7766 | unsigned int op = bits (insn1, 5, 8); | |
7767 | unsigned int rn = bits (insn1, 0, 3); | |
7768 | ||
7769 | if (op == 0x2 && rn == 0xf) /* MOV */ | |
7770 | return thumb2_copy_alu_imm (gdbarch, insn1, insn2, regs, dsc); | |
7771 | else | |
7772 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7773 | "dp (shift reg)", dsc); | |
7774 | } | |
7775 | ||
7776 | ||
7777 | /* Decode extension register load/store. Exactly the same as | |
7778 | arm_decode_ext_reg_ld_st. */ | |
7779 | ||
7780 | static int | |
7781 | thumb2_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint16_t insn1, | |
7782 | uint16_t insn2, struct regcache *regs, | |
7783 | struct displaced_step_closure *dsc) | |
7784 | { | |
7785 | unsigned int opcode = bits (insn1, 4, 8); | |
7786 | ||
7787 | switch (opcode) | |
7788 | { | |
7789 | case 0x04: case 0x05: | |
7790 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7791 | "vfp/neon vmov", dsc); | |
7792 | ||
7793 | case 0x08: case 0x0c: /* 01x00 */ | |
7794 | case 0x0a: case 0x0e: /* 01x10 */ | |
7795 | case 0x12: case 0x16: /* 10x10 */ | |
7796 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7797 | "vfp/neon vstm/vpush", dsc); | |
7798 | ||
7799 | case 0x09: case 0x0d: /* 01x01 */ | |
7800 | case 0x0b: case 0x0f: /* 01x11 */ | |
7801 | case 0x13: case 0x17: /* 10x11 */ | |
7802 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7803 | "vfp/neon vldm/vpop", dsc); | |
7804 | ||
7805 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
7806 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7807 | "vstr", dsc); | |
7808 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
7809 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, regs, dsc); | |
7810 | } | |
7811 | ||
7812 | /* Should be unreachable. */ | |
7813 | return 1; | |
7814 | } | |
7815 | ||
cca44b1b | 7816 | static int |
7ff120b4 YQ |
7817 | arm_decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to, |
7818 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
7819 | { |
7820 | unsigned int op1 = bits (insn, 20, 25); | |
7821 | int op = bit (insn, 4); | |
7822 | unsigned int coproc = bits (insn, 8, 11); | |
7823 | unsigned int rn = bits (insn, 16, 19); | |
7824 | ||
7825 | if ((op1 & 0x20) == 0x00 && (op1 & 0x3a) != 0x00 && (coproc & 0xe) == 0xa) | |
7ff120b4 | 7826 | return arm_decode_ext_reg_ld_st (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7827 | else if ((op1 & 0x21) == 0x00 && (op1 & 0x3a) != 0x00 |
7828 | && (coproc & 0xe) != 0xa) | |
7829 | /* stc/stc2. */ | |
7ff120b4 | 7830 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7831 | else if ((op1 & 0x21) == 0x01 && (op1 & 0x3a) != 0x00 |
7832 | && (coproc & 0xe) != 0xa) | |
7833 | /* ldc/ldc2 imm/lit. */ | |
7ff120b4 | 7834 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b | 7835 | else if ((op1 & 0x3e) == 0x00) |
7ff120b4 | 7836 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b | 7837 | else if ((op1 & 0x3e) == 0x04 && (coproc & 0xe) == 0xa) |
7ff120b4 | 7838 | return arm_copy_unmodified (gdbarch, insn, "neon 64bit xfer", dsc); |
cca44b1b | 7839 | else if (op1 == 0x04 && (coproc & 0xe) != 0xa) |
7ff120b4 | 7840 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
cca44b1b | 7841 | else if (op1 == 0x05 && (coproc & 0xe) != 0xa) |
7ff120b4 | 7842 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
cca44b1b JB |
7843 | else if ((op1 & 0x30) == 0x20 && !op) |
7844 | { | |
7845 | if ((coproc & 0xe) == 0xa) | |
7ff120b4 | 7846 | return arm_copy_unmodified (gdbarch, insn, "vfp dataproc", dsc); |
cca44b1b | 7847 | else |
7ff120b4 | 7848 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7849 | } |
7850 | else if ((op1 & 0x30) == 0x20 && op) | |
7ff120b4 | 7851 | return arm_copy_unmodified (gdbarch, insn, "neon 8/16/32 bit xfer", dsc); |
cca44b1b | 7852 | else if ((op1 & 0x31) == 0x20 && op && (coproc & 0xe) != 0xa) |
7ff120b4 | 7853 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
cca44b1b | 7854 | else if ((op1 & 0x31) == 0x21 && op && (coproc & 0xe) != 0xa) |
7ff120b4 | 7855 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
cca44b1b | 7856 | else if ((op1 & 0x30) == 0x30) |
7ff120b4 | 7857 | return arm_copy_svc (gdbarch, insn, regs, dsc); |
cca44b1b | 7858 | else |
7ff120b4 | 7859 | return arm_copy_undef (gdbarch, insn, dsc); /* Possibly unreachable. */ |
cca44b1b JB |
7860 | } |
7861 | ||
34518530 YQ |
7862 | static int |
7863 | thumb2_decode_svc_copro (struct gdbarch *gdbarch, uint16_t insn1, | |
7864 | uint16_t insn2, struct regcache *regs, | |
7865 | struct displaced_step_closure *dsc) | |
7866 | { | |
7867 | unsigned int coproc = bits (insn2, 8, 11); | |
7868 | unsigned int op1 = bits (insn1, 4, 9); | |
7869 | unsigned int bit_5_8 = bits (insn1, 5, 8); | |
7870 | unsigned int bit_9 = bit (insn1, 9); | |
7871 | unsigned int bit_4 = bit (insn1, 4); | |
7872 | unsigned int rn = bits (insn1, 0, 3); | |
7873 | ||
7874 | if (bit_9 == 0) | |
7875 | { | |
7876 | if (bit_5_8 == 2) | |
7877 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7878 | "neon 64bit xfer/mrrc/mrrc2/mcrr/mcrr2", | |
7879 | dsc); | |
7880 | else if (bit_5_8 == 0) /* UNDEFINED. */ | |
7881 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); | |
7882 | else | |
7883 | { | |
7884 | /*coproc is 101x. SIMD/VFP, ext registers load/store. */ | |
7885 | if ((coproc & 0xe) == 0xa) | |
7886 | return thumb2_decode_ext_reg_ld_st (gdbarch, insn1, insn2, regs, | |
7887 | dsc); | |
7888 | else /* coproc is not 101x. */ | |
7889 | { | |
7890 | if (bit_4 == 0) /* STC/STC2. */ | |
7891 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7892 | "stc/stc2", dsc); | |
7893 | else /* LDC/LDC2 {literal, immeidate}. */ | |
7894 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, | |
7895 | regs, dsc); | |
7896 | } | |
7897 | } | |
7898 | } | |
7899 | else | |
7900 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "coproc", dsc); | |
7901 | ||
7902 | return 0; | |
7903 | } | |
7904 | ||
7905 | static void | |
7906 | install_pc_relative (struct gdbarch *gdbarch, struct regcache *regs, | |
7907 | struct displaced_step_closure *dsc, int rd) | |
7908 | { | |
7909 | /* ADR Rd, #imm | |
7910 | ||
7911 | Rewrite as: | |
7912 | ||
7913 | Preparation: Rd <- PC | |
7914 | Insn: ADD Rd, #imm | |
7915 | Cleanup: Null. | |
7916 | */ | |
7917 | ||
7918 | /* Rd <- PC */ | |
7919 | int val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
7920 | displaced_write_reg (regs, dsc, rd, val, CANNOT_WRITE_PC); | |
7921 | } | |
7922 | ||
7923 | static int | |
7924 | thumb_copy_pc_relative_16bit (struct gdbarch *gdbarch, struct regcache *regs, | |
7925 | struct displaced_step_closure *dsc, | |
7926 | int rd, unsigned int imm) | |
7927 | { | |
7928 | ||
7929 | /* Encoding T2: ADDS Rd, #imm */ | |
7930 | dsc->modinsn[0] = (0x3000 | (rd << 8) | imm); | |
7931 | ||
7932 | install_pc_relative (gdbarch, regs, dsc, rd); | |
7933 | ||
7934 | return 0; | |
7935 | } | |
7936 | ||
7937 | static int | |
7938 | thumb_decode_pc_relative_16bit (struct gdbarch *gdbarch, uint16_t insn, | |
7939 | struct regcache *regs, | |
7940 | struct displaced_step_closure *dsc) | |
7941 | { | |
7942 | unsigned int rd = bits (insn, 8, 10); | |
7943 | unsigned int imm8 = bits (insn, 0, 7); | |
7944 | ||
7945 | if (debug_displaced) | |
7946 | fprintf_unfiltered (gdb_stdlog, | |
7947 | "displaced: copying thumb adr r%d, #%d insn %.4x\n", | |
7948 | rd, imm8, insn); | |
7949 | ||
7950 | return thumb_copy_pc_relative_16bit (gdbarch, regs, dsc, rd, imm8); | |
7951 | } | |
7952 | ||
7953 | static int | |
7954 | thumb_copy_pc_relative_32bit (struct gdbarch *gdbarch, uint16_t insn1, | |
7955 | uint16_t insn2, struct regcache *regs, | |
7956 | struct displaced_step_closure *dsc) | |
7957 | { | |
7958 | unsigned int rd = bits (insn2, 8, 11); | |
7959 | /* Since immediate has the same encoding in ADR ADD and SUB, so we simply | |
7960 | extract raw immediate encoding rather than computing immediate. When | |
7961 | generating ADD or SUB instruction, we can simply perform OR operation to | |
7962 | set immediate into ADD. */ | |
7963 | unsigned int imm_3_8 = insn2 & 0x70ff; | |
7964 | unsigned int imm_i = insn1 & 0x0400; /* Clear all bits except bit 10. */ | |
7965 | ||
7966 | if (debug_displaced) | |
7967 | fprintf_unfiltered (gdb_stdlog, | |
7968 | "displaced: copying thumb adr r%d, #%d:%d insn %.4x%.4x\n", | |
7969 | rd, imm_i, imm_3_8, insn1, insn2); | |
7970 | ||
7971 | if (bit (insn1, 7)) /* Encoding T2 */ | |
7972 | { | |
7973 | /* Encoding T3: SUB Rd, Rd, #imm */ | |
7974 | dsc->modinsn[0] = (0xf1a0 | rd | imm_i); | |
7975 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); | |
7976 | } | |
7977 | else /* Encoding T3 */ | |
7978 | { | |
7979 | /* Encoding T3: ADD Rd, Rd, #imm */ | |
7980 | dsc->modinsn[0] = (0xf100 | rd | imm_i); | |
7981 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); | |
7982 | } | |
7983 | dsc->numinsns = 2; | |
7984 | ||
7985 | install_pc_relative (gdbarch, regs, dsc, rd); | |
7986 | ||
7987 | return 0; | |
7988 | } | |
7989 | ||
7990 | static int | |
7991 | thumb_copy_16bit_ldr_literal (struct gdbarch *gdbarch, unsigned short insn1, | |
7992 | struct regcache *regs, | |
7993 | struct displaced_step_closure *dsc) | |
7994 | { | |
7995 | unsigned int rt = bits (insn1, 8, 10); | |
7996 | unsigned int pc; | |
7997 | int imm8 = (bits (insn1, 0, 7) << 2); | |
7998 | CORE_ADDR from = dsc->insn_addr; | |
7999 | ||
8000 | /* LDR Rd, #imm8 | |
8001 | ||
8002 | Rwrite as: | |
8003 | ||
8004 | Preparation: tmp0 <- R0, tmp2 <- R2, tmp3 <- R3, R2 <- PC, R3 <- #imm8; | |
8005 | ||
8006 | Insn: LDR R0, [R2, R3]; | |
8007 | Cleanup: R2 <- tmp2, R3 <- tmp3, Rd <- R0, R0 <- tmp0 */ | |
8008 | ||
8009 | if (debug_displaced) | |
8010 | fprintf_unfiltered (gdb_stdlog, | |
8011 | "displaced: copying thumb ldr r%d [pc #%d]\n" | |
8012 | , rt, imm8); | |
8013 | ||
8014 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
8015 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
8016 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); | |
8017 | pc = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
8018 | /* The assembler calculates the required value of the offset from the | |
8019 | Align(PC,4) value of this instruction to the label. */ | |
8020 | pc = pc & 0xfffffffc; | |
8021 | ||
8022 | displaced_write_reg (regs, dsc, 2, pc, CANNOT_WRITE_PC); | |
8023 | displaced_write_reg (regs, dsc, 3, imm8, CANNOT_WRITE_PC); | |
8024 | ||
8025 | dsc->rd = rt; | |
8026 | dsc->u.ldst.xfersize = 4; | |
8027 | dsc->u.ldst.rn = 0; | |
8028 | dsc->u.ldst.immed = 0; | |
8029 | dsc->u.ldst.writeback = 0; | |
8030 | dsc->u.ldst.restore_r4 = 0; | |
8031 | ||
8032 | dsc->modinsn[0] = 0x58d0; /* ldr r0, [r2, r3]*/ | |
8033 | ||
8034 | dsc->cleanup = &cleanup_load; | |
8035 | ||
8036 | return 0; | |
8037 | } | |
8038 | ||
8039 | /* Copy Thumb cbnz/cbz insruction. */ | |
8040 | ||
8041 | static int | |
8042 | thumb_copy_cbnz_cbz (struct gdbarch *gdbarch, uint16_t insn1, | |
8043 | struct regcache *regs, | |
8044 | struct displaced_step_closure *dsc) | |
8045 | { | |
8046 | int non_zero = bit (insn1, 11); | |
8047 | unsigned int imm5 = (bit (insn1, 9) << 6) | (bits (insn1, 3, 7) << 1); | |
8048 | CORE_ADDR from = dsc->insn_addr; | |
8049 | int rn = bits (insn1, 0, 2); | |
8050 | int rn_val = displaced_read_reg (regs, dsc, rn); | |
8051 | ||
8052 | dsc->u.branch.cond = (rn_val && non_zero) || (!rn_val && !non_zero); | |
8053 | /* CBNZ and CBZ do not affect the condition flags. If condition is true, | |
8054 | set it INST_AL, so cleanup_branch will know branch is taken, otherwise, | |
8055 | condition is false, let it be, cleanup_branch will do nothing. */ | |
8056 | if (dsc->u.branch.cond) | |
8057 | { | |
8058 | dsc->u.branch.cond = INST_AL; | |
8059 | dsc->u.branch.dest = from + 4 + imm5; | |
8060 | } | |
8061 | else | |
8062 | dsc->u.branch.dest = from + 2; | |
8063 | ||
8064 | dsc->u.branch.link = 0; | |
8065 | dsc->u.branch.exchange = 0; | |
8066 | ||
8067 | if (debug_displaced) | |
8068 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s [r%d = 0x%x]" | |
8069 | " insn %.4x to %.8lx\n", non_zero ? "cbnz" : "cbz", | |
8070 | rn, rn_val, insn1, dsc->u.branch.dest); | |
8071 | ||
8072 | dsc->modinsn[0] = THUMB_NOP; | |
8073 | ||
8074 | dsc->cleanup = &cleanup_branch; | |
8075 | return 0; | |
8076 | } | |
8077 | ||
8078 | /* Copy Table Branch Byte/Halfword */ | |
8079 | static int | |
8080 | thumb2_copy_table_branch (struct gdbarch *gdbarch, uint16_t insn1, | |
8081 | uint16_t insn2, struct regcache *regs, | |
8082 | struct displaced_step_closure *dsc) | |
8083 | { | |
8084 | ULONGEST rn_val, rm_val; | |
8085 | int is_tbh = bit (insn2, 4); | |
8086 | CORE_ADDR halfwords = 0; | |
8087 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8088 | ||
8089 | rn_val = displaced_read_reg (regs, dsc, bits (insn1, 0, 3)); | |
8090 | rm_val = displaced_read_reg (regs, dsc, bits (insn2, 0, 3)); | |
8091 | ||
8092 | if (is_tbh) | |
8093 | { | |
8094 | gdb_byte buf[2]; | |
8095 | ||
8096 | target_read_memory (rn_val + 2 * rm_val, buf, 2); | |
8097 | halfwords = extract_unsigned_integer (buf, 2, byte_order); | |
8098 | } | |
8099 | else | |
8100 | { | |
8101 | gdb_byte buf[1]; | |
8102 | ||
8103 | target_read_memory (rn_val + rm_val, buf, 1); | |
8104 | halfwords = extract_unsigned_integer (buf, 1, byte_order); | |
8105 | } | |
8106 | ||
8107 | if (debug_displaced) | |
8108 | fprintf_unfiltered (gdb_stdlog, "displaced: %s base 0x%x offset 0x%x" | |
8109 | " offset 0x%x\n", is_tbh ? "tbh" : "tbb", | |
8110 | (unsigned int) rn_val, (unsigned int) rm_val, | |
8111 | (unsigned int) halfwords); | |
8112 | ||
8113 | dsc->u.branch.cond = INST_AL; | |
8114 | dsc->u.branch.link = 0; | |
8115 | dsc->u.branch.exchange = 0; | |
8116 | dsc->u.branch.dest = dsc->insn_addr + 4 + 2 * halfwords; | |
8117 | ||
8118 | dsc->cleanup = &cleanup_branch; | |
8119 | ||
8120 | return 0; | |
8121 | } | |
8122 | ||
8123 | static void | |
8124 | cleanup_pop_pc_16bit_all (struct gdbarch *gdbarch, struct regcache *regs, | |
8125 | struct displaced_step_closure *dsc) | |
8126 | { | |
8127 | /* PC <- r7 */ | |
8128 | int val = displaced_read_reg (regs, dsc, 7); | |
8129 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, val, BX_WRITE_PC); | |
8130 | ||
8131 | /* r7 <- r8 */ | |
8132 | val = displaced_read_reg (regs, dsc, 8); | |
8133 | displaced_write_reg (regs, dsc, 7, val, CANNOT_WRITE_PC); | |
8134 | ||
8135 | /* r8 <- tmp[0] */ | |
8136 | displaced_write_reg (regs, dsc, 8, dsc->tmp[0], CANNOT_WRITE_PC); | |
8137 | ||
8138 | } | |
8139 | ||
8140 | static int | |
8141 | thumb_copy_pop_pc_16bit (struct gdbarch *gdbarch, unsigned short insn1, | |
8142 | struct regcache *regs, | |
8143 | struct displaced_step_closure *dsc) | |
8144 | { | |
8145 | dsc->u.block.regmask = insn1 & 0x00ff; | |
8146 | ||
8147 | /* Rewrite instruction: POP {rX, rY, ...,rZ, PC} | |
8148 | to : | |
8149 | ||
8150 | (1) register list is full, that is, r0-r7 are used. | |
8151 | Prepare: tmp[0] <- r8 | |
8152 | ||
8153 | POP {r0, r1, ...., r6, r7}; remove PC from reglist | |
8154 | MOV r8, r7; Move value of r7 to r8; | |
8155 | POP {r7}; Store PC value into r7. | |
8156 | ||
8157 | Cleanup: PC <- r7, r7 <- r8, r8 <-tmp[0] | |
8158 | ||
8159 | (2) register list is not full, supposing there are N registers in | |
8160 | register list (except PC, 0 <= N <= 7). | |
8161 | Prepare: for each i, 0 - N, tmp[i] <- ri. | |
8162 | ||
8163 | POP {r0, r1, ...., rN}; | |
8164 | ||
8165 | Cleanup: Set registers in original reglist from r0 - rN. Restore r0 - rN | |
8166 | from tmp[] properly. | |
8167 | */ | |
8168 | if (debug_displaced) | |
8169 | fprintf_unfiltered (gdb_stdlog, | |
8170 | "displaced: copying thumb pop {%.8x, pc} insn %.4x\n", | |
8171 | dsc->u.block.regmask, insn1); | |
8172 | ||
8173 | if (dsc->u.block.regmask == 0xff) | |
8174 | { | |
8175 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 8); | |
8176 | ||
8177 | dsc->modinsn[0] = (insn1 & 0xfeff); /* POP {r0,r1,...,r6, r7} */ | |
8178 | dsc->modinsn[1] = 0x46b8; /* MOV r8, r7 */ | |
8179 | dsc->modinsn[2] = 0xbc80; /* POP {r7} */ | |
8180 | ||
8181 | dsc->numinsns = 3; | |
8182 | dsc->cleanup = &cleanup_pop_pc_16bit_all; | |
8183 | } | |
8184 | else | |
8185 | { | |
8186 | unsigned int num_in_list = bitcount (dsc->u.block.regmask); | |
8187 | unsigned int new_regmask, bit = 1; | |
8188 | unsigned int to = 0, from = 0, i, new_rn; | |
8189 | ||
8190 | for (i = 0; i < num_in_list + 1; i++) | |
8191 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); | |
8192 | ||
8193 | new_regmask = (1 << (num_in_list + 1)) - 1; | |
8194 | ||
8195 | if (debug_displaced) | |
8196 | fprintf_unfiltered (gdb_stdlog, _("displaced: POP " | |
8197 | "{..., pc}: original reg list %.4x," | |
8198 | " modified list %.4x\n"), | |
8199 | (int) dsc->u.block.regmask, new_regmask); | |
8200 | ||
8201 | dsc->u.block.regmask |= 0x8000; | |
8202 | dsc->u.block.writeback = 0; | |
8203 | dsc->u.block.cond = INST_AL; | |
8204 | ||
8205 | dsc->modinsn[0] = (insn1 & ~0x1ff) | (new_regmask & 0xff); | |
8206 | ||
8207 | dsc->cleanup = &cleanup_block_load_pc; | |
8208 | } | |
8209 | ||
8210 | return 0; | |
8211 | } | |
8212 | ||
8213 | static void | |
8214 | thumb_process_displaced_16bit_insn (struct gdbarch *gdbarch, uint16_t insn1, | |
8215 | struct regcache *regs, | |
8216 | struct displaced_step_closure *dsc) | |
8217 | { | |
8218 | unsigned short op_bit_12_15 = bits (insn1, 12, 15); | |
8219 | unsigned short op_bit_10_11 = bits (insn1, 10, 11); | |
8220 | int err = 0; | |
8221 | ||
8222 | /* 16-bit thumb instructions. */ | |
8223 | switch (op_bit_12_15) | |
8224 | { | |
8225 | /* Shift (imme), add, subtract, move and compare. */ | |
8226 | case 0: case 1: case 2: case 3: | |
8227 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, | |
8228 | "shift/add/sub/mov/cmp", | |
8229 | dsc); | |
8230 | break; | |
8231 | case 4: | |
8232 | switch (op_bit_10_11) | |
8233 | { | |
8234 | case 0: /* Data-processing */ | |
8235 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, | |
8236 | "data-processing", | |
8237 | dsc); | |
8238 | break; | |
8239 | case 1: /* Special data instructions and branch and exchange. */ | |
8240 | { | |
8241 | unsigned short op = bits (insn1, 7, 9); | |
8242 | if (op == 6 || op == 7) /* BX or BLX */ | |
8243 | err = thumb_copy_bx_blx_reg (gdbarch, insn1, regs, dsc); | |
8244 | else if (bits (insn1, 6, 7) != 0) /* ADD/MOV/CMP high registers. */ | |
8245 | err = thumb_copy_alu_reg (gdbarch, insn1, regs, dsc); | |
8246 | else | |
8247 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "special data", | |
8248 | dsc); | |
8249 | } | |
8250 | break; | |
8251 | default: /* LDR (literal) */ | |
8252 | err = thumb_copy_16bit_ldr_literal (gdbarch, insn1, regs, dsc); | |
8253 | } | |
8254 | break; | |
8255 | case 5: case 6: case 7: case 8: case 9: /* Load/Store single data item */ | |
8256 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldr/str", dsc); | |
8257 | break; | |
8258 | case 10: | |
8259 | if (op_bit_10_11 < 2) /* Generate PC-relative address */ | |
8260 | err = thumb_decode_pc_relative_16bit (gdbarch, insn1, regs, dsc); | |
8261 | else /* Generate SP-relative address */ | |
8262 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "sp-relative", dsc); | |
8263 | break; | |
8264 | case 11: /* Misc 16-bit instructions */ | |
8265 | { | |
8266 | switch (bits (insn1, 8, 11)) | |
8267 | { | |
8268 | case 1: case 3: case 9: case 11: /* CBNZ, CBZ */ | |
8269 | err = thumb_copy_cbnz_cbz (gdbarch, insn1, regs, dsc); | |
8270 | break; | |
8271 | case 12: case 13: /* POP */ | |
8272 | if (bit (insn1, 8)) /* PC is in register list. */ | |
8273 | err = thumb_copy_pop_pc_16bit (gdbarch, insn1, regs, dsc); | |
8274 | else | |
8275 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "pop", dsc); | |
8276 | break; | |
8277 | case 15: /* If-Then, and hints */ | |
8278 | if (bits (insn1, 0, 3)) | |
8279 | /* If-Then makes up to four following instructions conditional. | |
8280 | IT instruction itself is not conditional, so handle it as a | |
8281 | common unmodified instruction. */ | |
8282 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "If-Then", | |
8283 | dsc); | |
8284 | else | |
8285 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "hints", dsc); | |
8286 | break; | |
8287 | default: | |
8288 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "misc", dsc); | |
8289 | } | |
8290 | } | |
8291 | break; | |
8292 | case 12: | |
8293 | if (op_bit_10_11 < 2) /* Store multiple registers */ | |
8294 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "stm", dsc); | |
8295 | else /* Load multiple registers */ | |
8296 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldm", dsc); | |
8297 | break; | |
8298 | case 13: /* Conditional branch and supervisor call */ | |
8299 | if (bits (insn1, 9, 11) != 7) /* conditional branch */ | |
8300 | err = thumb_copy_b (gdbarch, insn1, dsc); | |
8301 | else | |
8302 | err = thumb_copy_svc (gdbarch, insn1, regs, dsc); | |
8303 | break; | |
8304 | case 14: /* Unconditional branch */ | |
8305 | err = thumb_copy_b (gdbarch, insn1, dsc); | |
8306 | break; | |
8307 | default: | |
8308 | err = 1; | |
8309 | } | |
8310 | ||
8311 | if (err) | |
8312 | internal_error (__FILE__, __LINE__, | |
8313 | _("thumb_process_displaced_16bit_insn: Instruction decode error")); | |
8314 | } | |
8315 | ||
8316 | static int | |
8317 | decode_thumb_32bit_ld_mem_hints (struct gdbarch *gdbarch, | |
8318 | uint16_t insn1, uint16_t insn2, | |
8319 | struct regcache *regs, | |
8320 | struct displaced_step_closure *dsc) | |
8321 | { | |
8322 | int rt = bits (insn2, 12, 15); | |
8323 | int rn = bits (insn1, 0, 3); | |
8324 | int op1 = bits (insn1, 7, 8); | |
8325 | int err = 0; | |
8326 | ||
8327 | switch (bits (insn1, 5, 6)) | |
8328 | { | |
8329 | case 0: /* Load byte and memory hints */ | |
8330 | if (rt == 0xf) /* PLD/PLI */ | |
8331 | { | |
8332 | if (rn == 0xf) | |
8333 | /* PLD literal or Encoding T3 of PLI(immediate, literal). */ | |
8334 | return thumb2_copy_preload (gdbarch, insn1, insn2, regs, dsc); | |
8335 | else | |
8336 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8337 | "pli/pld", dsc); | |
8338 | } | |
8339 | else | |
8340 | { | |
8341 | if (rn == 0xf) /* LDRB/LDRSB (literal) */ | |
8342 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, | |
8343 | 1); | |
8344 | else | |
8345 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8346 | "ldrb{reg, immediate}/ldrbt", | |
8347 | dsc); | |
8348 | } | |
8349 | ||
8350 | break; | |
8351 | case 1: /* Load halfword and memory hints. */ | |
8352 | if (rt == 0xf) /* PLD{W} and Unalloc memory hint. */ | |
8353 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8354 | "pld/unalloc memhint", dsc); | |
8355 | else | |
8356 | { | |
8357 | if (rn == 0xf) | |
8358 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, | |
8359 | 2); | |
8360 | else | |
8361 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8362 | "ldrh/ldrht", dsc); | |
8363 | } | |
8364 | break; | |
8365 | case 2: /* Load word */ | |
8366 | { | |
8367 | int insn2_bit_8_11 = bits (insn2, 8, 11); | |
8368 | ||
8369 | if (rn == 0xf) | |
8370 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, 4); | |
8371 | else if (op1 == 0x1) /* Encoding T3 */ | |
8372 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, dsc, | |
8373 | 0, 1); | |
8374 | else /* op1 == 0x0 */ | |
8375 | { | |
8376 | if (insn2_bit_8_11 == 0xc || (insn2_bit_8_11 & 0x9) == 0x9) | |
8377 | /* LDR (immediate) */ | |
8378 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, | |
8379 | dsc, bit (insn2, 8), 1); | |
8380 | else if (insn2_bit_8_11 == 0xe) /* LDRT */ | |
8381 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8382 | "ldrt", dsc); | |
8383 | else | |
8384 | /* LDR (register) */ | |
8385 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, | |
8386 | dsc, 0, 0); | |
8387 | } | |
8388 | break; | |
8389 | } | |
8390 | default: | |
8391 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); | |
8392 | break; | |
8393 | } | |
8394 | return 0; | |
8395 | } | |
8396 | ||
8397 | static void | |
8398 | thumb_process_displaced_32bit_insn (struct gdbarch *gdbarch, uint16_t insn1, | |
8399 | uint16_t insn2, struct regcache *regs, | |
8400 | struct displaced_step_closure *dsc) | |
8401 | { | |
8402 | int err = 0; | |
8403 | unsigned short op = bit (insn2, 15); | |
8404 | unsigned int op1 = bits (insn1, 11, 12); | |
8405 | ||
8406 | switch (op1) | |
8407 | { | |
8408 | case 1: | |
8409 | { | |
8410 | switch (bits (insn1, 9, 10)) | |
8411 | { | |
8412 | case 0: | |
8413 | if (bit (insn1, 6)) | |
8414 | { | |
8415 | /* Load/store {dual, execlusive}, table branch. */ | |
8416 | if (bits (insn1, 7, 8) == 1 && bits (insn1, 4, 5) == 1 | |
8417 | && bits (insn2, 5, 7) == 0) | |
8418 | err = thumb2_copy_table_branch (gdbarch, insn1, insn2, regs, | |
8419 | dsc); | |
8420 | else | |
8421 | /* PC is not allowed to use in load/store {dual, exclusive} | |
8422 | instructions. */ | |
8423 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8424 | "load/store dual/ex", dsc); | |
8425 | } | |
8426 | else /* load/store multiple */ | |
8427 | { | |
8428 | switch (bits (insn1, 7, 8)) | |
8429 | { | |
8430 | case 0: case 3: /* SRS, RFE */ | |
8431 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8432 | "srs/rfe", dsc); | |
8433 | break; | |
8434 | case 1: case 2: /* LDM/STM/PUSH/POP */ | |
8435 | err = thumb2_copy_block_xfer (gdbarch, insn1, insn2, regs, dsc); | |
8436 | break; | |
8437 | } | |
8438 | } | |
8439 | break; | |
8440 | ||
8441 | case 1: | |
8442 | /* Data-processing (shift register). */ | |
8443 | err = thumb2_decode_dp_shift_reg (gdbarch, insn1, insn2, regs, | |
8444 | dsc); | |
8445 | break; | |
8446 | default: /* Coprocessor instructions. */ | |
8447 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); | |
8448 | break; | |
8449 | } | |
8450 | break; | |
8451 | } | |
8452 | case 2: /* op1 = 2 */ | |
8453 | if (op) /* Branch and misc control. */ | |
8454 | { | |
8455 | if (bit (insn2, 14) /* BLX/BL */ | |
8456 | || bit (insn2, 12) /* Unconditional branch */ | |
8457 | || (bits (insn1, 7, 9) != 0x7)) /* Conditional branch */ | |
8458 | err = thumb2_copy_b_bl_blx (gdbarch, insn1, insn2, regs, dsc); | |
8459 | else | |
8460 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8461 | "misc ctrl", dsc); | |
8462 | } | |
8463 | else | |
8464 | { | |
8465 | if (bit (insn1, 9)) /* Data processing (plain binary imm). */ | |
8466 | { | |
8467 | int op = bits (insn1, 4, 8); | |
8468 | int rn = bits (insn1, 0, 3); | |
8469 | if ((op == 0 || op == 0xa) && rn == 0xf) | |
8470 | err = thumb_copy_pc_relative_32bit (gdbarch, insn1, insn2, | |
8471 | regs, dsc); | |
8472 | else | |
8473 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8474 | "dp/pb", dsc); | |
8475 | } | |
8476 | else /* Data processing (modified immeidate) */ | |
8477 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8478 | "dp/mi", dsc); | |
8479 | } | |
8480 | break; | |
8481 | case 3: /* op1 = 3 */ | |
8482 | switch (bits (insn1, 9, 10)) | |
8483 | { | |
8484 | case 0: | |
8485 | if (bit (insn1, 4)) | |
8486 | err = decode_thumb_32bit_ld_mem_hints (gdbarch, insn1, insn2, | |
8487 | regs, dsc); | |
8488 | else /* NEON Load/Store and Store single data item */ | |
8489 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8490 | "neon elt/struct load/store", | |
8491 | dsc); | |
8492 | break; | |
8493 | case 1: /* op1 = 3, bits (9, 10) == 1 */ | |
8494 | switch (bits (insn1, 7, 8)) | |
8495 | { | |
8496 | case 0: case 1: /* Data processing (register) */ | |
8497 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8498 | "dp(reg)", dsc); | |
8499 | break; | |
8500 | case 2: /* Multiply and absolute difference */ | |
8501 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8502 | "mul/mua/diff", dsc); | |
8503 | break; | |
8504 | case 3: /* Long multiply and divide */ | |
8505 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8506 | "lmul/lmua", dsc); | |
8507 | break; | |
8508 | } | |
8509 | break; | |
8510 | default: /* Coprocessor instructions */ | |
8511 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); | |
8512 | break; | |
8513 | } | |
8514 | break; | |
8515 | default: | |
8516 | err = 1; | |
8517 | } | |
8518 | ||
8519 | if (err) | |
8520 | internal_error (__FILE__, __LINE__, | |
8521 | _("thumb_process_displaced_32bit_insn: Instruction decode error")); | |
8522 | ||
8523 | } | |
8524 | ||
b434a28f YQ |
8525 | static void |
8526 | thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, | |
8527 | CORE_ADDR to, struct regcache *regs, | |
8528 | struct displaced_step_closure *dsc) | |
8529 | { | |
34518530 YQ |
8530 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
8531 | uint16_t insn1 | |
8532 | = read_memory_unsigned_integer (from, 2, byte_order_for_code); | |
8533 | ||
8534 | if (debug_displaced) | |
8535 | fprintf_unfiltered (gdb_stdlog, "displaced: process thumb insn %.4x " | |
8536 | "at %.8lx\n", insn1, (unsigned long) from); | |
8537 | ||
8538 | dsc->is_thumb = 1; | |
8539 | dsc->insn_size = thumb_insn_size (insn1); | |
8540 | if (thumb_insn_size (insn1) == 4) | |
8541 | { | |
8542 | uint16_t insn2 | |
8543 | = read_memory_unsigned_integer (from + 2, 2, byte_order_for_code); | |
8544 | thumb_process_displaced_32bit_insn (gdbarch, insn1, insn2, regs, dsc); | |
8545 | } | |
8546 | else | |
8547 | thumb_process_displaced_16bit_insn (gdbarch, insn1, regs, dsc); | |
b434a28f YQ |
8548 | } |
8549 | ||
cca44b1b | 8550 | void |
b434a28f YQ |
8551 | arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, |
8552 | CORE_ADDR to, struct regcache *regs, | |
cca44b1b JB |
8553 | struct displaced_step_closure *dsc) |
8554 | { | |
8555 | int err = 0; | |
b434a28f YQ |
8556 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
8557 | uint32_t insn; | |
cca44b1b JB |
8558 | |
8559 | /* Most displaced instructions use a 1-instruction scratch space, so set this | |
8560 | here and override below if/when necessary. */ | |
8561 | dsc->numinsns = 1; | |
8562 | dsc->insn_addr = from; | |
8563 | dsc->scratch_base = to; | |
8564 | dsc->cleanup = NULL; | |
8565 | dsc->wrote_to_pc = 0; | |
8566 | ||
b434a28f YQ |
8567 | if (!displaced_in_arm_mode (regs)) |
8568 | return thumb_process_displaced_insn (gdbarch, from, to, regs, dsc); | |
8569 | ||
4db71c0b YQ |
8570 | dsc->is_thumb = 0; |
8571 | dsc->insn_size = 4; | |
b434a28f YQ |
8572 | insn = read_memory_unsigned_integer (from, 4, byte_order_for_code); |
8573 | if (debug_displaced) | |
8574 | fprintf_unfiltered (gdb_stdlog, "displaced: stepping insn %.8lx " | |
8575 | "at %.8lx\n", (unsigned long) insn, | |
8576 | (unsigned long) from); | |
8577 | ||
cca44b1b | 8578 | if ((insn & 0xf0000000) == 0xf0000000) |
7ff120b4 | 8579 | err = arm_decode_unconditional (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8580 | else switch (((insn & 0x10) >> 4) | ((insn & 0xe000000) >> 24)) |
8581 | { | |
8582 | case 0x0: case 0x1: case 0x2: case 0x3: | |
7ff120b4 | 8583 | err = arm_decode_dp_misc (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8584 | break; |
8585 | ||
8586 | case 0x4: case 0x5: case 0x6: | |
7ff120b4 | 8587 | err = arm_decode_ld_st_word_ubyte (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8588 | break; |
8589 | ||
8590 | case 0x7: | |
7ff120b4 | 8591 | err = arm_decode_media (gdbarch, insn, dsc); |
cca44b1b JB |
8592 | break; |
8593 | ||
8594 | case 0x8: case 0x9: case 0xa: case 0xb: | |
7ff120b4 | 8595 | err = arm_decode_b_bl_ldmstm (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8596 | break; |
8597 | ||
8598 | case 0xc: case 0xd: case 0xe: case 0xf: | |
7ff120b4 | 8599 | err = arm_decode_svc_copro (gdbarch, insn, to, regs, dsc); |
cca44b1b JB |
8600 | break; |
8601 | } | |
8602 | ||
8603 | if (err) | |
8604 | internal_error (__FILE__, __LINE__, | |
8605 | _("arm_process_displaced_insn: Instruction decode error")); | |
8606 | } | |
8607 | ||
8608 | /* Actually set up the scratch space for a displaced instruction. */ | |
8609 | ||
8610 | void | |
8611 | arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from, | |
8612 | CORE_ADDR to, struct displaced_step_closure *dsc) | |
8613 | { | |
8614 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4db71c0b | 8615 | unsigned int i, len, offset; |
cca44b1b | 8616 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
4db71c0b YQ |
8617 | int size = dsc->is_thumb? 2 : 4; |
8618 | const unsigned char *bkp_insn; | |
cca44b1b | 8619 | |
4db71c0b | 8620 | offset = 0; |
cca44b1b JB |
8621 | /* Poke modified instruction(s). */ |
8622 | for (i = 0; i < dsc->numinsns; i++) | |
8623 | { | |
8624 | if (debug_displaced) | |
4db71c0b YQ |
8625 | { |
8626 | fprintf_unfiltered (gdb_stdlog, "displaced: writing insn "); | |
8627 | if (size == 4) | |
8628 | fprintf_unfiltered (gdb_stdlog, "%.8lx", | |
8629 | dsc->modinsn[i]); | |
8630 | else if (size == 2) | |
8631 | fprintf_unfiltered (gdb_stdlog, "%.4x", | |
8632 | (unsigned short)dsc->modinsn[i]); | |
8633 | ||
8634 | fprintf_unfiltered (gdb_stdlog, " at %.8lx\n", | |
8635 | (unsigned long) to + offset); | |
8636 | ||
8637 | } | |
8638 | write_memory_unsigned_integer (to + offset, size, | |
8639 | byte_order_for_code, | |
cca44b1b | 8640 | dsc->modinsn[i]); |
4db71c0b YQ |
8641 | offset += size; |
8642 | } | |
8643 | ||
8644 | /* Choose the correct breakpoint instruction. */ | |
8645 | if (dsc->is_thumb) | |
8646 | { | |
8647 | bkp_insn = tdep->thumb_breakpoint; | |
8648 | len = tdep->thumb_breakpoint_size; | |
8649 | } | |
8650 | else | |
8651 | { | |
8652 | bkp_insn = tdep->arm_breakpoint; | |
8653 | len = tdep->arm_breakpoint_size; | |
cca44b1b JB |
8654 | } |
8655 | ||
8656 | /* Put breakpoint afterwards. */ | |
4db71c0b | 8657 | write_memory (to + offset, bkp_insn, len); |
cca44b1b JB |
8658 | |
8659 | if (debug_displaced) | |
8660 | fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ", | |
8661 | paddress (gdbarch, from), paddress (gdbarch, to)); | |
8662 | } | |
8663 | ||
8664 | /* Entry point for copying an instruction into scratch space for displaced | |
8665 | stepping. */ | |
8666 | ||
8667 | struct displaced_step_closure * | |
8668 | arm_displaced_step_copy_insn (struct gdbarch *gdbarch, | |
8669 | CORE_ADDR from, CORE_ADDR to, | |
8670 | struct regcache *regs) | |
8671 | { | |
8672 | struct displaced_step_closure *dsc | |
8673 | = xmalloc (sizeof (struct displaced_step_closure)); | |
b434a28f | 8674 | arm_process_displaced_insn (gdbarch, from, to, regs, dsc); |
cca44b1b JB |
8675 | arm_displaced_init_closure (gdbarch, from, to, dsc); |
8676 | ||
8677 | return dsc; | |
8678 | } | |
8679 | ||
8680 | /* Entry point for cleaning things up after a displaced instruction has been | |
8681 | single-stepped. */ | |
8682 | ||
8683 | void | |
8684 | arm_displaced_step_fixup (struct gdbarch *gdbarch, | |
8685 | struct displaced_step_closure *dsc, | |
8686 | CORE_ADDR from, CORE_ADDR to, | |
8687 | struct regcache *regs) | |
8688 | { | |
8689 | if (dsc->cleanup) | |
8690 | dsc->cleanup (gdbarch, regs, dsc); | |
8691 | ||
8692 | if (!dsc->wrote_to_pc) | |
4db71c0b YQ |
8693 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
8694 | dsc->insn_addr + dsc->insn_size); | |
8695 | ||
cca44b1b JB |
8696 | } |
8697 | ||
8698 | #include "bfd-in2.h" | |
8699 | #include "libcoff.h" | |
8700 | ||
8701 | static int | |
8702 | gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info) | |
8703 | { | |
9779414d DJ |
8704 | struct gdbarch *gdbarch = info->application_data; |
8705 | ||
8706 | if (arm_pc_is_thumb (gdbarch, memaddr)) | |
cca44b1b JB |
8707 | { |
8708 | static asymbol *asym; | |
8709 | static combined_entry_type ce; | |
8710 | static struct coff_symbol_struct csym; | |
8711 | static struct bfd fake_bfd; | |
8712 | static bfd_target fake_target; | |
8713 | ||
8714 | if (csym.native == NULL) | |
8715 | { | |
8716 | /* Create a fake symbol vector containing a Thumb symbol. | |
8717 | This is solely so that the code in print_insn_little_arm() | |
8718 | and print_insn_big_arm() in opcodes/arm-dis.c will detect | |
8719 | the presence of a Thumb symbol and switch to decoding | |
8720 | Thumb instructions. */ | |
8721 | ||
8722 | fake_target.flavour = bfd_target_coff_flavour; | |
8723 | fake_bfd.xvec = &fake_target; | |
8724 | ce.u.syment.n_sclass = C_THUMBEXTFUNC; | |
8725 | csym.native = &ce; | |
8726 | csym.symbol.the_bfd = &fake_bfd; | |
8727 | csym.symbol.name = "fake"; | |
8728 | asym = (asymbol *) & csym; | |
8729 | } | |
8730 | ||
8731 | memaddr = UNMAKE_THUMB_ADDR (memaddr); | |
8732 | info->symbols = &asym; | |
8733 | } | |
8734 | else | |
8735 | info->symbols = NULL; | |
8736 | ||
8737 | if (info->endian == BFD_ENDIAN_BIG) | |
8738 | return print_insn_big_arm (memaddr, info); | |
8739 | else | |
8740 | return print_insn_little_arm (memaddr, info); | |
8741 | } | |
8742 | ||
8743 | /* The following define instruction sequences that will cause ARM | |
8744 | cpu's to take an undefined instruction trap. These are used to | |
8745 | signal a breakpoint to GDB. | |
8746 | ||
8747 | The newer ARMv4T cpu's are capable of operating in ARM or Thumb | |
8748 | modes. A different instruction is required for each mode. The ARM | |
8749 | cpu's can also be big or little endian. Thus four different | |
8750 | instructions are needed to support all cases. | |
8751 | ||
8752 | Note: ARMv4 defines several new instructions that will take the | |
8753 | undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does | |
8754 | not in fact add the new instructions. The new undefined | |
8755 | instructions in ARMv4 are all instructions that had no defined | |
8756 | behaviour in earlier chips. There is no guarantee that they will | |
8757 | raise an exception, but may be treated as NOP's. In practice, it | |
8758 | may only safe to rely on instructions matching: | |
8759 | ||
8760 | 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 | |
8761 | 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 | |
8762 | C C C C 0 1 1 x x x x x x x x x x x x x x x x x x x x 1 x x x x | |
8763 | ||
0963b4bd | 8764 | Even this may only true if the condition predicate is true. The |
cca44b1b JB |
8765 | following use a condition predicate of ALWAYS so it is always TRUE. |
8766 | ||
8767 | There are other ways of forcing a breakpoint. GNU/Linux, RISC iX, | |
8768 | and NetBSD all use a software interrupt rather than an undefined | |
8769 | instruction to force a trap. This can be handled by by the | |
8770 | abi-specific code during establishment of the gdbarch vector. */ | |
8771 | ||
8772 | #define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7} | |
8773 | #define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE} | |
8774 | #define THUMB_LE_BREAKPOINT {0xbe,0xbe} | |
8775 | #define THUMB_BE_BREAKPOINT {0xbe,0xbe} | |
8776 | ||
8777 | static const char arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT; | |
8778 | static const char arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT; | |
8779 | static const char arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT; | |
8780 | static const char arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT; | |
8781 | ||
8782 | /* Determine the type and size of breakpoint to insert at PCPTR. Uses | |
8783 | the program counter value to determine whether a 16-bit or 32-bit | |
8784 | breakpoint should be used. It returns a pointer to a string of | |
8785 | bytes that encode a breakpoint instruction, stores the length of | |
8786 | the string to *lenptr, and adjusts the program counter (if | |
8787 | necessary) to point to the actual memory location where the | |
8788 | breakpoint should be inserted. */ | |
8789 | ||
8790 | static const unsigned char * | |
8791 | arm_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr) | |
8792 | { | |
8793 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
177321bd | 8794 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
cca44b1b | 8795 | |
9779414d | 8796 | if (arm_pc_is_thumb (gdbarch, *pcptr)) |
cca44b1b JB |
8797 | { |
8798 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); | |
177321bd DJ |
8799 | |
8800 | /* If we have a separate 32-bit breakpoint instruction for Thumb-2, | |
8801 | check whether we are replacing a 32-bit instruction. */ | |
8802 | if (tdep->thumb2_breakpoint != NULL) | |
8803 | { | |
8804 | gdb_byte buf[2]; | |
8805 | if (target_read_memory (*pcptr, buf, 2) == 0) | |
8806 | { | |
8807 | unsigned short inst1; | |
8808 | inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
db24da6d | 8809 | if (thumb_insn_size (inst1) == 4) |
177321bd DJ |
8810 | { |
8811 | *lenptr = tdep->thumb2_breakpoint_size; | |
8812 | return tdep->thumb2_breakpoint; | |
8813 | } | |
8814 | } | |
8815 | } | |
8816 | ||
cca44b1b JB |
8817 | *lenptr = tdep->thumb_breakpoint_size; |
8818 | return tdep->thumb_breakpoint; | |
8819 | } | |
8820 | else | |
8821 | { | |
8822 | *lenptr = tdep->arm_breakpoint_size; | |
8823 | return tdep->arm_breakpoint; | |
8824 | } | |
8825 | } | |
8826 | ||
177321bd DJ |
8827 | static void |
8828 | arm_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, | |
8829 | int *kindptr) | |
8830 | { | |
177321bd DJ |
8831 | arm_breakpoint_from_pc (gdbarch, pcptr, kindptr); |
8832 | ||
9779414d | 8833 | if (arm_pc_is_thumb (gdbarch, *pcptr) && *kindptr == 4) |
177321bd DJ |
8834 | /* The documented magic value for a 32-bit Thumb-2 breakpoint, so |
8835 | that this is not confused with a 32-bit ARM breakpoint. */ | |
8836 | *kindptr = 3; | |
8837 | } | |
8838 | ||
cca44b1b JB |
8839 | /* Extract from an array REGBUF containing the (raw) register state a |
8840 | function return value of type TYPE, and copy that, in virtual | |
8841 | format, into VALBUF. */ | |
8842 | ||
8843 | static void | |
8844 | arm_extract_return_value (struct type *type, struct regcache *regs, | |
8845 | gdb_byte *valbuf) | |
8846 | { | |
8847 | struct gdbarch *gdbarch = get_regcache_arch (regs); | |
8848 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8849 | ||
8850 | if (TYPE_CODE_FLT == TYPE_CODE (type)) | |
8851 | { | |
8852 | switch (gdbarch_tdep (gdbarch)->fp_model) | |
8853 | { | |
8854 | case ARM_FLOAT_FPA: | |
8855 | { | |
8856 | /* The value is in register F0 in internal format. We need to | |
8857 | extract the raw value and then convert it to the desired | |
8858 | internal type. */ | |
8859 | bfd_byte tmpbuf[FP_REGISTER_SIZE]; | |
8860 | ||
8861 | regcache_cooked_read (regs, ARM_F0_REGNUM, tmpbuf); | |
8862 | convert_from_extended (floatformat_from_type (type), tmpbuf, | |
8863 | valbuf, gdbarch_byte_order (gdbarch)); | |
8864 | } | |
8865 | break; | |
8866 | ||
8867 | case ARM_FLOAT_SOFT_FPA: | |
8868 | case ARM_FLOAT_SOFT_VFP: | |
8869 | /* ARM_FLOAT_VFP can arise if this is a variadic function so | |
8870 | not using the VFP ABI code. */ | |
8871 | case ARM_FLOAT_VFP: | |
8872 | regcache_cooked_read (regs, ARM_A1_REGNUM, valbuf); | |
8873 | if (TYPE_LENGTH (type) > 4) | |
8874 | regcache_cooked_read (regs, ARM_A1_REGNUM + 1, | |
8875 | valbuf + INT_REGISTER_SIZE); | |
8876 | break; | |
8877 | ||
8878 | default: | |
0963b4bd MS |
8879 | internal_error (__FILE__, __LINE__, |
8880 | _("arm_extract_return_value: " | |
8881 | "Floating point model not supported")); | |
cca44b1b JB |
8882 | break; |
8883 | } | |
8884 | } | |
8885 | else if (TYPE_CODE (type) == TYPE_CODE_INT | |
8886 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
8887 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
8888 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
8889 | || TYPE_CODE (type) == TYPE_CODE_REF | |
8890 | || TYPE_CODE (type) == TYPE_CODE_ENUM) | |
8891 | { | |
b021a221 MS |
8892 | /* If the type is a plain integer, then the access is |
8893 | straight-forward. Otherwise we have to play around a bit | |
8894 | more. */ | |
cca44b1b JB |
8895 | int len = TYPE_LENGTH (type); |
8896 | int regno = ARM_A1_REGNUM; | |
8897 | ULONGEST tmp; | |
8898 | ||
8899 | while (len > 0) | |
8900 | { | |
8901 | /* By using store_unsigned_integer we avoid having to do | |
8902 | anything special for small big-endian values. */ | |
8903 | regcache_cooked_read_unsigned (regs, regno++, &tmp); | |
8904 | store_unsigned_integer (valbuf, | |
8905 | (len > INT_REGISTER_SIZE | |
8906 | ? INT_REGISTER_SIZE : len), | |
8907 | byte_order, tmp); | |
8908 | len -= INT_REGISTER_SIZE; | |
8909 | valbuf += INT_REGISTER_SIZE; | |
8910 | } | |
8911 | } | |
8912 | else | |
8913 | { | |
8914 | /* For a structure or union the behaviour is as if the value had | |
8915 | been stored to word-aligned memory and then loaded into | |
8916 | registers with 32-bit load instruction(s). */ | |
8917 | int len = TYPE_LENGTH (type); | |
8918 | int regno = ARM_A1_REGNUM; | |
8919 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; | |
8920 | ||
8921 | while (len > 0) | |
8922 | { | |
8923 | regcache_cooked_read (regs, regno++, tmpbuf); | |
8924 | memcpy (valbuf, tmpbuf, | |
8925 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); | |
8926 | len -= INT_REGISTER_SIZE; | |
8927 | valbuf += INT_REGISTER_SIZE; | |
8928 | } | |
8929 | } | |
8930 | } | |
8931 | ||
8932 | ||
8933 | /* Will a function return an aggregate type in memory or in a | |
8934 | register? Return 0 if an aggregate type can be returned in a | |
8935 | register, 1 if it must be returned in memory. */ | |
8936 | ||
8937 | static int | |
8938 | arm_return_in_memory (struct gdbarch *gdbarch, struct type *type) | |
8939 | { | |
8940 | int nRc; | |
8941 | enum type_code code; | |
8942 | ||
8943 | CHECK_TYPEDEF (type); | |
8944 | ||
8945 | /* In the ARM ABI, "integer" like aggregate types are returned in | |
8946 | registers. For an aggregate type to be integer like, its size | |
8947 | must be less than or equal to INT_REGISTER_SIZE and the | |
8948 | offset of each addressable subfield must be zero. Note that bit | |
8949 | fields are not addressable, and all addressable subfields of | |
8950 | unions always start at offset zero. | |
8951 | ||
8952 | This function is based on the behaviour of GCC 2.95.1. | |
8953 | See: gcc/arm.c: arm_return_in_memory() for details. | |
8954 | ||
8955 | Note: All versions of GCC before GCC 2.95.2 do not set up the | |
8956 | parameters correctly for a function returning the following | |
8957 | structure: struct { float f;}; This should be returned in memory, | |
8958 | not a register. Richard Earnshaw sent me a patch, but I do not | |
8959 | know of any way to detect if a function like the above has been | |
8960 | compiled with the correct calling convention. */ | |
8961 | ||
8962 | /* All aggregate types that won't fit in a register must be returned | |
8963 | in memory. */ | |
8964 | if (TYPE_LENGTH (type) > INT_REGISTER_SIZE) | |
8965 | { | |
8966 | return 1; | |
8967 | } | |
8968 | ||
8969 | /* The AAPCS says all aggregates not larger than a word are returned | |
8970 | in a register. */ | |
8971 | if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS) | |
8972 | return 0; | |
8973 | ||
8974 | /* The only aggregate types that can be returned in a register are | |
8975 | structs and unions. Arrays must be returned in memory. */ | |
8976 | code = TYPE_CODE (type); | |
8977 | if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code)) | |
8978 | { | |
8979 | return 1; | |
8980 | } | |
8981 | ||
8982 | /* Assume all other aggregate types can be returned in a register. | |
8983 | Run a check for structures, unions and arrays. */ | |
8984 | nRc = 0; | |
8985 | ||
8986 | if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code)) | |
8987 | { | |
8988 | int i; | |
8989 | /* Need to check if this struct/union is "integer" like. For | |
8990 | this to be true, its size must be less than or equal to | |
8991 | INT_REGISTER_SIZE and the offset of each addressable | |
8992 | subfield must be zero. Note that bit fields are not | |
8993 | addressable, and unions always start at offset zero. If any | |
8994 | of the subfields is a floating point type, the struct/union | |
8995 | cannot be an integer type. */ | |
8996 | ||
8997 | /* For each field in the object, check: | |
8998 | 1) Is it FP? --> yes, nRc = 1; | |
67255d04 RE |
8999 | 2) Is it addressable (bitpos != 0) and |
9000 | not packed (bitsize == 0)? | |
9001 | --> yes, nRc = 1 | |
9002 | */ | |
9003 | ||
9004 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
9005 | { | |
9006 | enum type_code field_type_code; | |
0963b4bd MS |
9007 | field_type_code = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, |
9008 | i))); | |
67255d04 RE |
9009 | |
9010 | /* Is it a floating point type field? */ | |
9011 | if (field_type_code == TYPE_CODE_FLT) | |
9012 | { | |
9013 | nRc = 1; | |
9014 | break; | |
9015 | } | |
9016 | ||
9017 | /* If bitpos != 0, then we have to care about it. */ | |
9018 | if (TYPE_FIELD_BITPOS (type, i) != 0) | |
9019 | { | |
9020 | /* Bitfields are not addressable. If the field bitsize is | |
9021 | zero, then the field is not packed. Hence it cannot be | |
9022 | a bitfield or any other packed type. */ | |
9023 | if (TYPE_FIELD_BITSIZE (type, i) == 0) | |
9024 | { | |
9025 | nRc = 1; | |
9026 | break; | |
9027 | } | |
9028 | } | |
9029 | } | |
9030 | } | |
9031 | ||
9032 | return nRc; | |
9033 | } | |
9034 | ||
34e8f22d RE |
9035 | /* Write into appropriate registers a function return value of type |
9036 | TYPE, given in virtual format. */ | |
9037 | ||
9038 | static void | |
b508a996 | 9039 | arm_store_return_value (struct type *type, struct regcache *regs, |
5238cf52 | 9040 | const gdb_byte *valbuf) |
34e8f22d | 9041 | { |
be8626e0 | 9042 | struct gdbarch *gdbarch = get_regcache_arch (regs); |
e17a4113 | 9043 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
be8626e0 | 9044 | |
34e8f22d RE |
9045 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
9046 | { | |
7a5ea0d4 | 9047 | char buf[MAX_REGISTER_SIZE]; |
34e8f22d | 9048 | |
be8626e0 | 9049 | switch (gdbarch_tdep (gdbarch)->fp_model) |
08216dd7 RE |
9050 | { |
9051 | case ARM_FLOAT_FPA: | |
9052 | ||
be8626e0 MD |
9053 | convert_to_extended (floatformat_from_type (type), buf, valbuf, |
9054 | gdbarch_byte_order (gdbarch)); | |
b508a996 | 9055 | regcache_cooked_write (regs, ARM_F0_REGNUM, buf); |
08216dd7 RE |
9056 | break; |
9057 | ||
fd50bc42 | 9058 | case ARM_FLOAT_SOFT_FPA: |
08216dd7 | 9059 | case ARM_FLOAT_SOFT_VFP: |
90445bd3 DJ |
9060 | /* ARM_FLOAT_VFP can arise if this is a variadic function so |
9061 | not using the VFP ABI code. */ | |
9062 | case ARM_FLOAT_VFP: | |
b508a996 RE |
9063 | regcache_cooked_write (regs, ARM_A1_REGNUM, valbuf); |
9064 | if (TYPE_LENGTH (type) > 4) | |
9065 | regcache_cooked_write (regs, ARM_A1_REGNUM + 1, | |
7a5ea0d4 | 9066 | valbuf + INT_REGISTER_SIZE); |
08216dd7 RE |
9067 | break; |
9068 | ||
9069 | default: | |
9b20d036 MS |
9070 | internal_error (__FILE__, __LINE__, |
9071 | _("arm_store_return_value: Floating " | |
9072 | "point model not supported")); | |
08216dd7 RE |
9073 | break; |
9074 | } | |
34e8f22d | 9075 | } |
b508a996 RE |
9076 | else if (TYPE_CODE (type) == TYPE_CODE_INT |
9077 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
9078 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
9079 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
9080 | || TYPE_CODE (type) == TYPE_CODE_REF | |
9081 | || TYPE_CODE (type) == TYPE_CODE_ENUM) | |
9082 | { | |
9083 | if (TYPE_LENGTH (type) <= 4) | |
9084 | { | |
9085 | /* Values of one word or less are zero/sign-extended and | |
9086 | returned in r0. */ | |
7a5ea0d4 | 9087 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
b508a996 RE |
9088 | LONGEST val = unpack_long (type, valbuf); |
9089 | ||
e17a4113 | 9090 | store_signed_integer (tmpbuf, INT_REGISTER_SIZE, byte_order, val); |
b508a996 RE |
9091 | regcache_cooked_write (regs, ARM_A1_REGNUM, tmpbuf); |
9092 | } | |
9093 | else | |
9094 | { | |
9095 | /* Integral values greater than one word are stored in consecutive | |
9096 | registers starting with r0. This will always be a multiple of | |
9097 | the regiser size. */ | |
9098 | int len = TYPE_LENGTH (type); | |
9099 | int regno = ARM_A1_REGNUM; | |
9100 | ||
9101 | while (len > 0) | |
9102 | { | |
9103 | regcache_cooked_write (regs, regno++, valbuf); | |
7a5ea0d4 DJ |
9104 | len -= INT_REGISTER_SIZE; |
9105 | valbuf += INT_REGISTER_SIZE; | |
b508a996 RE |
9106 | } |
9107 | } | |
9108 | } | |
34e8f22d | 9109 | else |
b508a996 RE |
9110 | { |
9111 | /* For a structure or union the behaviour is as if the value had | |
9112 | been stored to word-aligned memory and then loaded into | |
9113 | registers with 32-bit load instruction(s). */ | |
9114 | int len = TYPE_LENGTH (type); | |
9115 | int regno = ARM_A1_REGNUM; | |
7a5ea0d4 | 9116 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
b508a996 RE |
9117 | |
9118 | while (len > 0) | |
9119 | { | |
9120 | memcpy (tmpbuf, valbuf, | |
7a5ea0d4 | 9121 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); |
b508a996 | 9122 | regcache_cooked_write (regs, regno++, tmpbuf); |
7a5ea0d4 DJ |
9123 | len -= INT_REGISTER_SIZE; |
9124 | valbuf += INT_REGISTER_SIZE; | |
b508a996 RE |
9125 | } |
9126 | } | |
34e8f22d RE |
9127 | } |
9128 | ||
2af48f68 PB |
9129 | |
9130 | /* Handle function return values. */ | |
9131 | ||
9132 | static enum return_value_convention | |
6a3a010b | 9133 | arm_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
9134 | struct type *valtype, struct regcache *regcache, |
9135 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
2af48f68 | 9136 | { |
7c00367c | 9137 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
6a3a010b | 9138 | struct type *func_type = function ? value_type (function) : NULL; |
90445bd3 DJ |
9139 | enum arm_vfp_cprc_base_type vfp_base_type; |
9140 | int vfp_base_count; | |
9141 | ||
9142 | if (arm_vfp_abi_for_function (gdbarch, func_type) | |
9143 | && arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count)) | |
9144 | { | |
9145 | int reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
9146 | int unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
9147 | int i; | |
9148 | for (i = 0; i < vfp_base_count; i++) | |
9149 | { | |
58d6951d DJ |
9150 | if (reg_char == 'q') |
9151 | { | |
9152 | if (writebuf) | |
9153 | arm_neon_quad_write (gdbarch, regcache, i, | |
9154 | writebuf + i * unit_length); | |
9155 | ||
9156 | if (readbuf) | |
9157 | arm_neon_quad_read (gdbarch, regcache, i, | |
9158 | readbuf + i * unit_length); | |
9159 | } | |
9160 | else | |
9161 | { | |
9162 | char name_buf[4]; | |
9163 | int regnum; | |
9164 | ||
8c042590 | 9165 | xsnprintf (name_buf, sizeof (name_buf), "%c%d", reg_char, i); |
58d6951d DJ |
9166 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9167 | strlen (name_buf)); | |
9168 | if (writebuf) | |
9169 | regcache_cooked_write (regcache, regnum, | |
9170 | writebuf + i * unit_length); | |
9171 | if (readbuf) | |
9172 | regcache_cooked_read (regcache, regnum, | |
9173 | readbuf + i * unit_length); | |
9174 | } | |
90445bd3 DJ |
9175 | } |
9176 | return RETURN_VALUE_REGISTER_CONVENTION; | |
9177 | } | |
7c00367c | 9178 | |
2af48f68 PB |
9179 | if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
9180 | || TYPE_CODE (valtype) == TYPE_CODE_UNION | |
9181 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) | |
9182 | { | |
7c00367c MK |
9183 | if (tdep->struct_return == pcc_struct_return |
9184 | || arm_return_in_memory (gdbarch, valtype)) | |
2af48f68 PB |
9185 | return RETURN_VALUE_STRUCT_CONVENTION; |
9186 | } | |
9187 | ||
7052e42c UW |
9188 | /* AAPCS returns complex types longer than a register in memory. */ |
9189 | if (tdep->arm_abi != ARM_ABI_APCS | |
9190 | && TYPE_CODE (valtype) == TYPE_CODE_COMPLEX | |
9191 | && TYPE_LENGTH (valtype) > INT_REGISTER_SIZE) | |
9192 | return RETURN_VALUE_STRUCT_CONVENTION; | |
9193 | ||
2af48f68 PB |
9194 | if (writebuf) |
9195 | arm_store_return_value (valtype, regcache, writebuf); | |
9196 | ||
9197 | if (readbuf) | |
9198 | arm_extract_return_value (valtype, regcache, readbuf); | |
9199 | ||
9200 | return RETURN_VALUE_REGISTER_CONVENTION; | |
9201 | } | |
9202 | ||
9203 | ||
9df628e0 | 9204 | static int |
60ade65d | 9205 | arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
9df628e0 | 9206 | { |
e17a4113 UW |
9207 | struct gdbarch *gdbarch = get_frame_arch (frame); |
9208 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
9209 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
9df628e0 | 9210 | CORE_ADDR jb_addr; |
7a5ea0d4 | 9211 | char buf[INT_REGISTER_SIZE]; |
9df628e0 | 9212 | |
60ade65d | 9213 | jb_addr = get_frame_register_unsigned (frame, ARM_A1_REGNUM); |
9df628e0 RE |
9214 | |
9215 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, | |
7a5ea0d4 | 9216 | INT_REGISTER_SIZE)) |
9df628e0 RE |
9217 | return 0; |
9218 | ||
e17a4113 | 9219 | *pc = extract_unsigned_integer (buf, INT_REGISTER_SIZE, byte_order); |
9df628e0 RE |
9220 | return 1; |
9221 | } | |
9222 | ||
faa95490 DJ |
9223 | /* Recognize GCC and GNU ld's trampolines. If we are in a trampoline, |
9224 | return the target PC. Otherwise return 0. */ | |
c906108c SS |
9225 | |
9226 | CORE_ADDR | |
52f729a7 | 9227 | arm_skip_stub (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 9228 | { |
2c02bd72 | 9229 | const char *name; |
faa95490 | 9230 | int namelen; |
c906108c SS |
9231 | CORE_ADDR start_addr; |
9232 | ||
9233 | /* Find the starting address and name of the function containing the PC. */ | |
9234 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) | |
9235 | return 0; | |
9236 | ||
faa95490 DJ |
9237 | /* If PC is in a Thumb call or return stub, return the address of the |
9238 | target PC, which is in a register. The thunk functions are called | |
9239 | _call_via_xx, where x is the register name. The possible names | |
3d8d5e79 DJ |
9240 | are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar |
9241 | functions, named __ARM_call_via_r[0-7]. */ | |
9242 | if (strncmp (name, "_call_via_", 10) == 0 | |
9243 | || strncmp (name, "__ARM_call_via_", strlen ("__ARM_call_via_")) == 0) | |
c906108c | 9244 | { |
ed9a39eb JM |
9245 | /* Use the name suffix to determine which register contains the |
9246 | target PC. */ | |
c5aa993b JM |
9247 | static char *table[15] = |
9248 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
9249 | "r8", "r9", "sl", "fp", "ip", "sp", "lr" | |
9250 | }; | |
c906108c | 9251 | int regno; |
faa95490 | 9252 | int offset = strlen (name) - 2; |
c906108c SS |
9253 | |
9254 | for (regno = 0; regno <= 14; regno++) | |
faa95490 | 9255 | if (strcmp (&name[offset], table[regno]) == 0) |
52f729a7 | 9256 | return get_frame_register_unsigned (frame, regno); |
c906108c | 9257 | } |
ed9a39eb | 9258 | |
faa95490 DJ |
9259 | /* GNU ld generates __foo_from_arm or __foo_from_thumb for |
9260 | non-interworking calls to foo. We could decode the stubs | |
9261 | to find the target but it's easier to use the symbol table. */ | |
9262 | namelen = strlen (name); | |
9263 | if (name[0] == '_' && name[1] == '_' | |
9264 | && ((namelen > 2 + strlen ("_from_thumb") | |
9265 | && strncmp (name + namelen - strlen ("_from_thumb"), "_from_thumb", | |
9266 | strlen ("_from_thumb")) == 0) | |
9267 | || (namelen > 2 + strlen ("_from_arm") | |
9268 | && strncmp (name + namelen - strlen ("_from_arm"), "_from_arm", | |
9269 | strlen ("_from_arm")) == 0))) | |
9270 | { | |
9271 | char *target_name; | |
9272 | int target_len = namelen - 2; | |
9273 | struct minimal_symbol *minsym; | |
9274 | struct objfile *objfile; | |
9275 | struct obj_section *sec; | |
9276 | ||
9277 | if (name[namelen - 1] == 'b') | |
9278 | target_len -= strlen ("_from_thumb"); | |
9279 | else | |
9280 | target_len -= strlen ("_from_arm"); | |
9281 | ||
9282 | target_name = alloca (target_len + 1); | |
9283 | memcpy (target_name, name + 2, target_len); | |
9284 | target_name[target_len] = '\0'; | |
9285 | ||
9286 | sec = find_pc_section (pc); | |
9287 | objfile = (sec == NULL) ? NULL : sec->objfile; | |
9288 | minsym = lookup_minimal_symbol (target_name, NULL, objfile); | |
9289 | if (minsym != NULL) | |
9290 | return SYMBOL_VALUE_ADDRESS (minsym); | |
9291 | else | |
9292 | return 0; | |
9293 | } | |
9294 | ||
c5aa993b | 9295 | return 0; /* not a stub */ |
c906108c SS |
9296 | } |
9297 | ||
afd7eef0 RE |
9298 | static void |
9299 | set_arm_command (char *args, int from_tty) | |
9300 | { | |
edefbb7c AC |
9301 | printf_unfiltered (_("\ |
9302 | \"set arm\" must be followed by an apporpriate subcommand.\n")); | |
afd7eef0 RE |
9303 | help_list (setarmcmdlist, "set arm ", all_commands, gdb_stdout); |
9304 | } | |
9305 | ||
9306 | static void | |
9307 | show_arm_command (char *args, int from_tty) | |
9308 | { | |
26304000 | 9309 | cmd_show_list (showarmcmdlist, from_tty, ""); |
afd7eef0 RE |
9310 | } |
9311 | ||
28e97307 DJ |
9312 | static void |
9313 | arm_update_current_architecture (void) | |
fd50bc42 | 9314 | { |
28e97307 | 9315 | struct gdbarch_info info; |
fd50bc42 | 9316 | |
28e97307 | 9317 | /* If the current architecture is not ARM, we have nothing to do. */ |
f5656ead | 9318 | if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_arm) |
28e97307 | 9319 | return; |
fd50bc42 | 9320 | |
28e97307 DJ |
9321 | /* Update the architecture. */ |
9322 | gdbarch_info_init (&info); | |
fd50bc42 | 9323 | |
28e97307 | 9324 | if (!gdbarch_update_p (info)) |
9b20d036 | 9325 | internal_error (__FILE__, __LINE__, _("could not update architecture")); |
fd50bc42 RE |
9326 | } |
9327 | ||
9328 | static void | |
9329 | set_fp_model_sfunc (char *args, int from_tty, | |
9330 | struct cmd_list_element *c) | |
9331 | { | |
9332 | enum arm_float_model fp_model; | |
9333 | ||
9334 | for (fp_model = ARM_FLOAT_AUTO; fp_model != ARM_FLOAT_LAST; fp_model++) | |
9335 | if (strcmp (current_fp_model, fp_model_strings[fp_model]) == 0) | |
9336 | { | |
9337 | arm_fp_model = fp_model; | |
9338 | break; | |
9339 | } | |
9340 | ||
9341 | if (fp_model == ARM_FLOAT_LAST) | |
edefbb7c | 9342 | internal_error (__FILE__, __LINE__, _("Invalid fp model accepted: %s."), |
fd50bc42 RE |
9343 | current_fp_model); |
9344 | ||
28e97307 | 9345 | arm_update_current_architecture (); |
fd50bc42 RE |
9346 | } |
9347 | ||
9348 | static void | |
08546159 AC |
9349 | show_fp_model (struct ui_file *file, int from_tty, |
9350 | struct cmd_list_element *c, const char *value) | |
fd50bc42 | 9351 | { |
f5656ead | 9352 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
fd50bc42 | 9353 | |
28e97307 | 9354 | if (arm_fp_model == ARM_FLOAT_AUTO |
f5656ead | 9355 | && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm) |
28e97307 DJ |
9356 | fprintf_filtered (file, _("\ |
9357 | The current ARM floating point model is \"auto\" (currently \"%s\").\n"), | |
9358 | fp_model_strings[tdep->fp_model]); | |
9359 | else | |
9360 | fprintf_filtered (file, _("\ | |
9361 | The current ARM floating point model is \"%s\".\n"), | |
9362 | fp_model_strings[arm_fp_model]); | |
9363 | } | |
9364 | ||
9365 | static void | |
9366 | arm_set_abi (char *args, int from_tty, | |
9367 | struct cmd_list_element *c) | |
9368 | { | |
9369 | enum arm_abi_kind arm_abi; | |
9370 | ||
9371 | for (arm_abi = ARM_ABI_AUTO; arm_abi != ARM_ABI_LAST; arm_abi++) | |
9372 | if (strcmp (arm_abi_string, arm_abi_strings[arm_abi]) == 0) | |
9373 | { | |
9374 | arm_abi_global = arm_abi; | |
9375 | break; | |
9376 | } | |
9377 | ||
9378 | if (arm_abi == ARM_ABI_LAST) | |
9379 | internal_error (__FILE__, __LINE__, _("Invalid ABI accepted: %s."), | |
9380 | arm_abi_string); | |
9381 | ||
9382 | arm_update_current_architecture (); | |
9383 | } | |
9384 | ||
9385 | static void | |
9386 | arm_show_abi (struct ui_file *file, int from_tty, | |
9387 | struct cmd_list_element *c, const char *value) | |
9388 | { | |
f5656ead | 9389 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
28e97307 DJ |
9390 | |
9391 | if (arm_abi_global == ARM_ABI_AUTO | |
f5656ead | 9392 | && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm) |
28e97307 DJ |
9393 | fprintf_filtered (file, _("\ |
9394 | The current ARM ABI is \"auto\" (currently \"%s\").\n"), | |
9395 | arm_abi_strings[tdep->arm_abi]); | |
9396 | else | |
9397 | fprintf_filtered (file, _("The current ARM ABI is \"%s\".\n"), | |
9398 | arm_abi_string); | |
fd50bc42 RE |
9399 | } |
9400 | ||
0428b8f5 DJ |
9401 | static void |
9402 | arm_show_fallback_mode (struct ui_file *file, int from_tty, | |
9403 | struct cmd_list_element *c, const char *value) | |
9404 | { | |
0963b4bd MS |
9405 | fprintf_filtered (file, |
9406 | _("The current execution mode assumed " | |
9407 | "(when symbols are unavailable) is \"%s\".\n"), | |
0428b8f5 DJ |
9408 | arm_fallback_mode_string); |
9409 | } | |
9410 | ||
9411 | static void | |
9412 | arm_show_force_mode (struct ui_file *file, int from_tty, | |
9413 | struct cmd_list_element *c, const char *value) | |
9414 | { | |
f5656ead | 9415 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
0428b8f5 | 9416 | |
0963b4bd MS |
9417 | fprintf_filtered (file, |
9418 | _("The current execution mode assumed " | |
9419 | "(even when symbols are available) is \"%s\".\n"), | |
0428b8f5 DJ |
9420 | arm_force_mode_string); |
9421 | } | |
9422 | ||
afd7eef0 RE |
9423 | /* If the user changes the register disassembly style used for info |
9424 | register and other commands, we have to also switch the style used | |
9425 | in opcodes for disassembly output. This function is run in the "set | |
9426 | arm disassembly" command, and does that. */ | |
bc90b915 FN |
9427 | |
9428 | static void | |
afd7eef0 | 9429 | set_disassembly_style_sfunc (char *args, int from_tty, |
bc90b915 FN |
9430 | struct cmd_list_element *c) |
9431 | { | |
afd7eef0 | 9432 | set_disassembly_style (); |
bc90b915 FN |
9433 | } |
9434 | \f | |
966fbf70 | 9435 | /* Return the ARM register name corresponding to register I. */ |
a208b0cb | 9436 | static const char * |
d93859e2 | 9437 | arm_register_name (struct gdbarch *gdbarch, int i) |
966fbf70 | 9438 | { |
58d6951d DJ |
9439 | const int num_regs = gdbarch_num_regs (gdbarch); |
9440 | ||
9441 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
9442 | && i >= num_regs && i < num_regs + 32) | |
9443 | { | |
9444 | static const char *const vfp_pseudo_names[] = { | |
9445 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", | |
9446 | "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15", | |
9447 | "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23", | |
9448 | "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", | |
9449 | }; | |
9450 | ||
9451 | return vfp_pseudo_names[i - num_regs]; | |
9452 | } | |
9453 | ||
9454 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
9455 | && i >= num_regs + 32 && i < num_regs + 32 + 16) | |
9456 | { | |
9457 | static const char *const neon_pseudo_names[] = { | |
9458 | "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", | |
9459 | "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15", | |
9460 | }; | |
9461 | ||
9462 | return neon_pseudo_names[i - num_regs - 32]; | |
9463 | } | |
9464 | ||
ff6f572f DJ |
9465 | if (i >= ARRAY_SIZE (arm_register_names)) |
9466 | /* These registers are only supported on targets which supply | |
9467 | an XML description. */ | |
9468 | return ""; | |
9469 | ||
966fbf70 RE |
9470 | return arm_register_names[i]; |
9471 | } | |
9472 | ||
bc90b915 | 9473 | static void |
afd7eef0 | 9474 | set_disassembly_style (void) |
bc90b915 | 9475 | { |
123dc839 | 9476 | int current; |
bc90b915 | 9477 | |
123dc839 DJ |
9478 | /* Find the style that the user wants. */ |
9479 | for (current = 0; current < num_disassembly_options; current++) | |
9480 | if (disassembly_style == valid_disassembly_styles[current]) | |
9481 | break; | |
9482 | gdb_assert (current < num_disassembly_options); | |
bc90b915 | 9483 | |
94c30b78 | 9484 | /* Synchronize the disassembler. */ |
bc90b915 FN |
9485 | set_arm_regname_option (current); |
9486 | } | |
9487 | ||
082fc60d RE |
9488 | /* Test whether the coff symbol specific value corresponds to a Thumb |
9489 | function. */ | |
9490 | ||
9491 | static int | |
9492 | coff_sym_is_thumb (int val) | |
9493 | { | |
f8bf5763 PM |
9494 | return (val == C_THUMBEXT |
9495 | || val == C_THUMBSTAT | |
9496 | || val == C_THUMBEXTFUNC | |
9497 | || val == C_THUMBSTATFUNC | |
9498 | || val == C_THUMBLABEL); | |
082fc60d RE |
9499 | } |
9500 | ||
9501 | /* arm_coff_make_msymbol_special() | |
9502 | arm_elf_make_msymbol_special() | |
9503 | ||
9504 | These functions test whether the COFF or ELF symbol corresponds to | |
9505 | an address in thumb code, and set a "special" bit in a minimal | |
9506 | symbol to indicate that it does. */ | |
9507 | ||
34e8f22d | 9508 | static void |
082fc60d RE |
9509 | arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym) |
9510 | { | |
467d42c4 UW |
9511 | if (ARM_SYM_BRANCH_TYPE (&((elf_symbol_type *)sym)->internal_elf_sym) |
9512 | == ST_BRANCH_TO_THUMB) | |
082fc60d RE |
9513 | MSYMBOL_SET_SPECIAL (msym); |
9514 | } | |
9515 | ||
34e8f22d | 9516 | static void |
082fc60d RE |
9517 | arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym) |
9518 | { | |
9519 | if (coff_sym_is_thumb (val)) | |
9520 | MSYMBOL_SET_SPECIAL (msym); | |
9521 | } | |
9522 | ||
60c5725c | 9523 | static void |
c1bd65d0 | 9524 | arm_objfile_data_free (struct objfile *objfile, void *arg) |
60c5725c DJ |
9525 | { |
9526 | struct arm_per_objfile *data = arg; | |
9527 | unsigned int i; | |
9528 | ||
9529 | for (i = 0; i < objfile->obfd->section_count; i++) | |
9530 | VEC_free (arm_mapping_symbol_s, data->section_maps[i]); | |
9531 | } | |
9532 | ||
9533 | static void | |
9534 | arm_record_special_symbol (struct gdbarch *gdbarch, struct objfile *objfile, | |
9535 | asymbol *sym) | |
9536 | { | |
9537 | const char *name = bfd_asymbol_name (sym); | |
9538 | struct arm_per_objfile *data; | |
9539 | VEC(arm_mapping_symbol_s) **map_p; | |
9540 | struct arm_mapping_symbol new_map_sym; | |
9541 | ||
9542 | gdb_assert (name[0] == '$'); | |
9543 | if (name[1] != 'a' && name[1] != 't' && name[1] != 'd') | |
9544 | return; | |
9545 | ||
9546 | data = objfile_data (objfile, arm_objfile_data_key); | |
9547 | if (data == NULL) | |
9548 | { | |
9549 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, | |
9550 | struct arm_per_objfile); | |
9551 | set_objfile_data (objfile, arm_objfile_data_key, data); | |
9552 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, | |
9553 | objfile->obfd->section_count, | |
9554 | VEC(arm_mapping_symbol_s) *); | |
9555 | } | |
9556 | map_p = &data->section_maps[bfd_get_section (sym)->index]; | |
9557 | ||
9558 | new_map_sym.value = sym->value; | |
9559 | new_map_sym.type = name[1]; | |
9560 | ||
9561 | /* Assume that most mapping symbols appear in order of increasing | |
9562 | value. If they were randomly distributed, it would be faster to | |
9563 | always push here and then sort at first use. */ | |
9564 | if (!VEC_empty (arm_mapping_symbol_s, *map_p)) | |
9565 | { | |
9566 | struct arm_mapping_symbol *prev_map_sym; | |
9567 | ||
9568 | prev_map_sym = VEC_last (arm_mapping_symbol_s, *map_p); | |
9569 | if (prev_map_sym->value >= sym->value) | |
9570 | { | |
9571 | unsigned int idx; | |
9572 | idx = VEC_lower_bound (arm_mapping_symbol_s, *map_p, &new_map_sym, | |
9573 | arm_compare_mapping_symbols); | |
9574 | VEC_safe_insert (arm_mapping_symbol_s, *map_p, idx, &new_map_sym); | |
9575 | return; | |
9576 | } | |
9577 | } | |
9578 | ||
9579 | VEC_safe_push (arm_mapping_symbol_s, *map_p, &new_map_sym); | |
9580 | } | |
9581 | ||
756fe439 | 9582 | static void |
61a1198a | 9583 | arm_write_pc (struct regcache *regcache, CORE_ADDR pc) |
756fe439 | 9584 | { |
9779414d | 9585 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
61a1198a | 9586 | regcache_cooked_write_unsigned (regcache, ARM_PC_REGNUM, pc); |
756fe439 DJ |
9587 | |
9588 | /* If necessary, set the T bit. */ | |
9589 | if (arm_apcs_32) | |
9590 | { | |
9779414d | 9591 | ULONGEST val, t_bit; |
61a1198a | 9592 | regcache_cooked_read_unsigned (regcache, ARM_PS_REGNUM, &val); |
9779414d DJ |
9593 | t_bit = arm_psr_thumb_bit (gdbarch); |
9594 | if (arm_pc_is_thumb (gdbarch, pc)) | |
9595 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, | |
9596 | val | t_bit); | |
756fe439 | 9597 | else |
61a1198a | 9598 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, |
9779414d | 9599 | val & ~t_bit); |
756fe439 DJ |
9600 | } |
9601 | } | |
123dc839 | 9602 | |
58d6951d DJ |
9603 | /* Read the contents of a NEON quad register, by reading from two |
9604 | double registers. This is used to implement the quad pseudo | |
9605 | registers, and for argument passing in case the quad registers are | |
9606 | missing; vectors are passed in quad registers when using the VFP | |
9607 | ABI, even if a NEON unit is not present. REGNUM is the index of | |
9608 | the quad register, in [0, 15]. */ | |
9609 | ||
05d1431c | 9610 | static enum register_status |
58d6951d DJ |
9611 | arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache, |
9612 | int regnum, gdb_byte *buf) | |
9613 | { | |
9614 | char name_buf[4]; | |
9615 | gdb_byte reg_buf[8]; | |
9616 | int offset, double_regnum; | |
05d1431c | 9617 | enum register_status status; |
58d6951d | 9618 | |
8c042590 | 9619 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1); |
58d6951d DJ |
9620 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9621 | strlen (name_buf)); | |
9622 | ||
9623 | /* d0 is always the least significant half of q0. */ | |
9624 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9625 | offset = 8; | |
9626 | else | |
9627 | offset = 0; | |
9628 | ||
05d1431c PA |
9629 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
9630 | if (status != REG_VALID) | |
9631 | return status; | |
58d6951d DJ |
9632 | memcpy (buf + offset, reg_buf, 8); |
9633 | ||
9634 | offset = 8 - offset; | |
05d1431c PA |
9635 | status = regcache_raw_read (regcache, double_regnum + 1, reg_buf); |
9636 | if (status != REG_VALID) | |
9637 | return status; | |
58d6951d | 9638 | memcpy (buf + offset, reg_buf, 8); |
05d1431c PA |
9639 | |
9640 | return REG_VALID; | |
58d6951d DJ |
9641 | } |
9642 | ||
05d1431c | 9643 | static enum register_status |
58d6951d DJ |
9644 | arm_pseudo_read (struct gdbarch *gdbarch, struct regcache *regcache, |
9645 | int regnum, gdb_byte *buf) | |
9646 | { | |
9647 | const int num_regs = gdbarch_num_regs (gdbarch); | |
9648 | char name_buf[4]; | |
9649 | gdb_byte reg_buf[8]; | |
9650 | int offset, double_regnum; | |
9651 | ||
9652 | gdb_assert (regnum >= num_regs); | |
9653 | regnum -= num_regs; | |
9654 | ||
9655 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
9656 | /* Quad-precision register. */ | |
05d1431c | 9657 | return arm_neon_quad_read (gdbarch, regcache, regnum - 32, buf); |
58d6951d DJ |
9658 | else |
9659 | { | |
05d1431c PA |
9660 | enum register_status status; |
9661 | ||
58d6951d DJ |
9662 | /* Single-precision register. */ |
9663 | gdb_assert (regnum < 32); | |
9664 | ||
9665 | /* s0 is always the least significant half of d0. */ | |
9666 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9667 | offset = (regnum & 1) ? 0 : 4; | |
9668 | else | |
9669 | offset = (regnum & 1) ? 4 : 0; | |
9670 | ||
8c042590 | 9671 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1); |
58d6951d DJ |
9672 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9673 | strlen (name_buf)); | |
9674 | ||
05d1431c PA |
9675 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
9676 | if (status == REG_VALID) | |
9677 | memcpy (buf, reg_buf + offset, 4); | |
9678 | return status; | |
58d6951d DJ |
9679 | } |
9680 | } | |
9681 | ||
9682 | /* Store the contents of BUF to a NEON quad register, by writing to | |
9683 | two double registers. This is used to implement the quad pseudo | |
9684 | registers, and for argument passing in case the quad registers are | |
9685 | missing; vectors are passed in quad registers when using the VFP | |
9686 | ABI, even if a NEON unit is not present. REGNUM is the index | |
9687 | of the quad register, in [0, 15]. */ | |
9688 | ||
9689 | static void | |
9690 | arm_neon_quad_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
9691 | int regnum, const gdb_byte *buf) | |
9692 | { | |
9693 | char name_buf[4]; | |
58d6951d DJ |
9694 | int offset, double_regnum; |
9695 | ||
8c042590 | 9696 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1); |
58d6951d DJ |
9697 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9698 | strlen (name_buf)); | |
9699 | ||
9700 | /* d0 is always the least significant half of q0. */ | |
9701 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9702 | offset = 8; | |
9703 | else | |
9704 | offset = 0; | |
9705 | ||
9706 | regcache_raw_write (regcache, double_regnum, buf + offset); | |
9707 | offset = 8 - offset; | |
9708 | regcache_raw_write (regcache, double_regnum + 1, buf + offset); | |
9709 | } | |
9710 | ||
9711 | static void | |
9712 | arm_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
9713 | int regnum, const gdb_byte *buf) | |
9714 | { | |
9715 | const int num_regs = gdbarch_num_regs (gdbarch); | |
9716 | char name_buf[4]; | |
9717 | gdb_byte reg_buf[8]; | |
9718 | int offset, double_regnum; | |
9719 | ||
9720 | gdb_assert (regnum >= num_regs); | |
9721 | regnum -= num_regs; | |
9722 | ||
9723 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
9724 | /* Quad-precision register. */ | |
9725 | arm_neon_quad_write (gdbarch, regcache, regnum - 32, buf); | |
9726 | else | |
9727 | { | |
9728 | /* Single-precision register. */ | |
9729 | gdb_assert (regnum < 32); | |
9730 | ||
9731 | /* s0 is always the least significant half of d0. */ | |
9732 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9733 | offset = (regnum & 1) ? 0 : 4; | |
9734 | else | |
9735 | offset = (regnum & 1) ? 4 : 0; | |
9736 | ||
8c042590 | 9737 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1); |
58d6951d DJ |
9738 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9739 | strlen (name_buf)); | |
9740 | ||
9741 | regcache_raw_read (regcache, double_regnum, reg_buf); | |
9742 | memcpy (reg_buf + offset, buf, 4); | |
9743 | regcache_raw_write (regcache, double_regnum, reg_buf); | |
9744 | } | |
9745 | } | |
9746 | ||
123dc839 DJ |
9747 | static struct value * |
9748 | value_of_arm_user_reg (struct frame_info *frame, const void *baton) | |
9749 | { | |
9750 | const int *reg_p = baton; | |
9751 | return value_of_register (*reg_p, frame); | |
9752 | } | |
97e03143 | 9753 | \f |
70f80edf JT |
9754 | static enum gdb_osabi |
9755 | arm_elf_osabi_sniffer (bfd *abfd) | |
97e03143 | 9756 | { |
2af48f68 | 9757 | unsigned int elfosabi; |
70f80edf | 9758 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
97e03143 | 9759 | |
70f80edf | 9760 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; |
97e03143 | 9761 | |
28e97307 DJ |
9762 | if (elfosabi == ELFOSABI_ARM) |
9763 | /* GNU tools use this value. Check note sections in this case, | |
9764 | as well. */ | |
9765 | bfd_map_over_sections (abfd, | |
9766 | generic_elf_osabi_sniff_abi_tag_sections, | |
9767 | &osabi); | |
97e03143 | 9768 | |
28e97307 | 9769 | /* Anything else will be handled by the generic ELF sniffer. */ |
70f80edf | 9770 | return osabi; |
97e03143 RE |
9771 | } |
9772 | ||
54483882 YQ |
9773 | static int |
9774 | arm_register_reggroup_p (struct gdbarch *gdbarch, int regnum, | |
9775 | struct reggroup *group) | |
9776 | { | |
2c291032 YQ |
9777 | /* FPS register's type is INT, but belongs to float_reggroup. Beside |
9778 | this, FPS register belongs to save_regroup, restore_reggroup, and | |
9779 | all_reggroup, of course. */ | |
54483882 | 9780 | if (regnum == ARM_FPS_REGNUM) |
2c291032 YQ |
9781 | return (group == float_reggroup |
9782 | || group == save_reggroup | |
9783 | || group == restore_reggroup | |
9784 | || group == all_reggroup); | |
54483882 YQ |
9785 | else |
9786 | return default_register_reggroup_p (gdbarch, regnum, group); | |
9787 | } | |
9788 | ||
25f8c692 JL |
9789 | \f |
9790 | /* For backward-compatibility we allow two 'g' packet lengths with | |
9791 | the remote protocol depending on whether FPA registers are | |
9792 | supplied. M-profile targets do not have FPA registers, but some | |
9793 | stubs already exist in the wild which use a 'g' packet which | |
9794 | supplies them albeit with dummy values. The packet format which | |
9795 | includes FPA registers should be considered deprecated for | |
9796 | M-profile targets. */ | |
9797 | ||
9798 | static void | |
9799 | arm_register_g_packet_guesses (struct gdbarch *gdbarch) | |
9800 | { | |
9801 | if (gdbarch_tdep (gdbarch)->is_m) | |
9802 | { | |
9803 | /* If we know from the executable this is an M-profile target, | |
9804 | cater for remote targets whose register set layout is the | |
9805 | same as the FPA layout. */ | |
9806 | register_remote_g_packet_guess (gdbarch, | |
03145bf4 | 9807 | /* r0-r12,sp,lr,pc; f0-f7; fps,xpsr */ |
25f8c692 JL |
9808 | (16 * INT_REGISTER_SIZE) |
9809 | + (8 * FP_REGISTER_SIZE) | |
9810 | + (2 * INT_REGISTER_SIZE), | |
9811 | tdesc_arm_with_m_fpa_layout); | |
9812 | ||
9813 | /* The regular M-profile layout. */ | |
9814 | register_remote_g_packet_guess (gdbarch, | |
9815 | /* r0-r12,sp,lr,pc; xpsr */ | |
9816 | (16 * INT_REGISTER_SIZE) | |
9817 | + INT_REGISTER_SIZE, | |
9818 | tdesc_arm_with_m); | |
3184d3f9 JL |
9819 | |
9820 | /* M-profile plus M4F VFP. */ | |
9821 | register_remote_g_packet_guess (gdbarch, | |
9822 | /* r0-r12,sp,lr,pc; d0-d15; fpscr,xpsr */ | |
9823 | (16 * INT_REGISTER_SIZE) | |
9824 | + (16 * VFP_REGISTER_SIZE) | |
9825 | + (2 * INT_REGISTER_SIZE), | |
9826 | tdesc_arm_with_m_vfp_d16); | |
25f8c692 JL |
9827 | } |
9828 | ||
9829 | /* Otherwise we don't have a useful guess. */ | |
9830 | } | |
9831 | ||
70f80edf | 9832 | \f |
da3c6d4a MS |
9833 | /* Initialize the current architecture based on INFO. If possible, |
9834 | re-use an architecture from ARCHES, which is a list of | |
9835 | architectures already created during this debugging session. | |
97e03143 | 9836 | |
da3c6d4a MS |
9837 | Called e.g. at program startup, when reading a core file, and when |
9838 | reading a binary file. */ | |
97e03143 | 9839 | |
39bbf761 RE |
9840 | static struct gdbarch * |
9841 | arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
9842 | { | |
97e03143 | 9843 | struct gdbarch_tdep *tdep; |
39bbf761 | 9844 | struct gdbarch *gdbarch; |
28e97307 DJ |
9845 | struct gdbarch_list *best_arch; |
9846 | enum arm_abi_kind arm_abi = arm_abi_global; | |
9847 | enum arm_float_model fp_model = arm_fp_model; | |
123dc839 | 9848 | struct tdesc_arch_data *tdesc_data = NULL; |
9779414d | 9849 | int i, is_m = 0; |
58d6951d DJ |
9850 | int have_vfp_registers = 0, have_vfp_pseudos = 0, have_neon_pseudos = 0; |
9851 | int have_neon = 0; | |
ff6f572f | 9852 | int have_fpa_registers = 1; |
9779414d DJ |
9853 | const struct target_desc *tdesc = info.target_desc; |
9854 | ||
9855 | /* If we have an object to base this architecture on, try to determine | |
9856 | its ABI. */ | |
9857 | ||
9858 | if (arm_abi == ARM_ABI_AUTO && info.abfd != NULL) | |
9859 | { | |
9860 | int ei_osabi, e_flags; | |
9861 | ||
9862 | switch (bfd_get_flavour (info.abfd)) | |
9863 | { | |
9864 | case bfd_target_aout_flavour: | |
9865 | /* Assume it's an old APCS-style ABI. */ | |
9866 | arm_abi = ARM_ABI_APCS; | |
9867 | break; | |
9868 | ||
9869 | case bfd_target_coff_flavour: | |
9870 | /* Assume it's an old APCS-style ABI. */ | |
9871 | /* XXX WinCE? */ | |
9872 | arm_abi = ARM_ABI_APCS; | |
9873 | break; | |
9874 | ||
9875 | case bfd_target_elf_flavour: | |
9876 | ei_osabi = elf_elfheader (info.abfd)->e_ident[EI_OSABI]; | |
9877 | e_flags = elf_elfheader (info.abfd)->e_flags; | |
9878 | ||
9879 | if (ei_osabi == ELFOSABI_ARM) | |
9880 | { | |
9881 | /* GNU tools used to use this value, but do not for EABI | |
9882 | objects. There's nowhere to tag an EABI version | |
9883 | anyway, so assume APCS. */ | |
9884 | arm_abi = ARM_ABI_APCS; | |
9885 | } | |
9886 | else if (ei_osabi == ELFOSABI_NONE) | |
9887 | { | |
9888 | int eabi_ver = EF_ARM_EABI_VERSION (e_flags); | |
9889 | int attr_arch, attr_profile; | |
9890 | ||
9891 | switch (eabi_ver) | |
9892 | { | |
9893 | case EF_ARM_EABI_UNKNOWN: | |
9894 | /* Assume GNU tools. */ | |
9895 | arm_abi = ARM_ABI_APCS; | |
9896 | break; | |
9897 | ||
9898 | case EF_ARM_EABI_VER4: | |
9899 | case EF_ARM_EABI_VER5: | |
9900 | arm_abi = ARM_ABI_AAPCS; | |
9901 | /* EABI binaries default to VFP float ordering. | |
9902 | They may also contain build attributes that can | |
9903 | be used to identify if the VFP argument-passing | |
9904 | ABI is in use. */ | |
9905 | if (fp_model == ARM_FLOAT_AUTO) | |
9906 | { | |
9907 | #ifdef HAVE_ELF | |
9908 | switch (bfd_elf_get_obj_attr_int (info.abfd, | |
9909 | OBJ_ATTR_PROC, | |
9910 | Tag_ABI_VFP_args)) | |
9911 | { | |
9912 | case 0: | |
9913 | /* "The user intended FP parameter/result | |
9914 | passing to conform to AAPCS, base | |
9915 | variant". */ | |
9916 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9917 | break; | |
9918 | case 1: | |
9919 | /* "The user intended FP parameter/result | |
9920 | passing to conform to AAPCS, VFP | |
9921 | variant". */ | |
9922 | fp_model = ARM_FLOAT_VFP; | |
9923 | break; | |
9924 | case 2: | |
9925 | /* "The user intended FP parameter/result | |
9926 | passing to conform to tool chain-specific | |
9927 | conventions" - we don't know any such | |
9928 | conventions, so leave it as "auto". */ | |
9929 | break; | |
9930 | default: | |
9931 | /* Attribute value not mentioned in the | |
9932 | October 2008 ABI, so leave it as | |
9933 | "auto". */ | |
9934 | break; | |
9935 | } | |
9936 | #else | |
9937 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9938 | #endif | |
9939 | } | |
9940 | break; | |
9941 | ||
9942 | default: | |
9943 | /* Leave it as "auto". */ | |
9944 | warning (_("unknown ARM EABI version 0x%x"), eabi_ver); | |
9945 | break; | |
9946 | } | |
9947 | ||
9948 | #ifdef HAVE_ELF | |
9949 | /* Detect M-profile programs. This only works if the | |
9950 | executable file includes build attributes; GCC does | |
9951 | copy them to the executable, but e.g. RealView does | |
9952 | not. */ | |
9953 | attr_arch = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, | |
9954 | Tag_CPU_arch); | |
0963b4bd MS |
9955 | attr_profile = bfd_elf_get_obj_attr_int (info.abfd, |
9956 | OBJ_ATTR_PROC, | |
9779414d DJ |
9957 | Tag_CPU_arch_profile); |
9958 | /* GCC specifies the profile for v6-M; RealView only | |
9959 | specifies the profile for architectures starting with | |
9960 | V7 (as opposed to architectures with a tag | |
9961 | numerically greater than TAG_CPU_ARCH_V7). */ | |
9962 | if (!tdesc_has_registers (tdesc) | |
9963 | && (attr_arch == TAG_CPU_ARCH_V6_M | |
9964 | || attr_arch == TAG_CPU_ARCH_V6S_M | |
9965 | || attr_profile == 'M')) | |
25f8c692 | 9966 | is_m = 1; |
9779414d DJ |
9967 | #endif |
9968 | } | |
9969 | ||
9970 | if (fp_model == ARM_FLOAT_AUTO) | |
9971 | { | |
9972 | int e_flags = elf_elfheader (info.abfd)->e_flags; | |
9973 | ||
9974 | switch (e_flags & (EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT)) | |
9975 | { | |
9976 | case 0: | |
9977 | /* Leave it as "auto". Strictly speaking this case | |
9978 | means FPA, but almost nobody uses that now, and | |
9979 | many toolchains fail to set the appropriate bits | |
9980 | for the floating-point model they use. */ | |
9981 | break; | |
9982 | case EF_ARM_SOFT_FLOAT: | |
9983 | fp_model = ARM_FLOAT_SOFT_FPA; | |
9984 | break; | |
9985 | case EF_ARM_VFP_FLOAT: | |
9986 | fp_model = ARM_FLOAT_VFP; | |
9987 | break; | |
9988 | case EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT: | |
9989 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9990 | break; | |
9991 | } | |
9992 | } | |
9993 | ||
9994 | if (e_flags & EF_ARM_BE8) | |
9995 | info.byte_order_for_code = BFD_ENDIAN_LITTLE; | |
9996 | ||
9997 | break; | |
9998 | ||
9999 | default: | |
10000 | /* Leave it as "auto". */ | |
10001 | break; | |
10002 | } | |
10003 | } | |
123dc839 DJ |
10004 | |
10005 | /* Check any target description for validity. */ | |
9779414d | 10006 | if (tdesc_has_registers (tdesc)) |
123dc839 DJ |
10007 | { |
10008 | /* For most registers we require GDB's default names; but also allow | |
10009 | the numeric names for sp / lr / pc, as a convenience. */ | |
10010 | static const char *const arm_sp_names[] = { "r13", "sp", NULL }; | |
10011 | static const char *const arm_lr_names[] = { "r14", "lr", NULL }; | |
10012 | static const char *const arm_pc_names[] = { "r15", "pc", NULL }; | |
10013 | ||
10014 | const struct tdesc_feature *feature; | |
58d6951d | 10015 | int valid_p; |
123dc839 | 10016 | |
9779414d | 10017 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
10018 | "org.gnu.gdb.arm.core"); |
10019 | if (feature == NULL) | |
9779414d DJ |
10020 | { |
10021 | feature = tdesc_find_feature (tdesc, | |
10022 | "org.gnu.gdb.arm.m-profile"); | |
10023 | if (feature == NULL) | |
10024 | return NULL; | |
10025 | else | |
10026 | is_m = 1; | |
10027 | } | |
123dc839 DJ |
10028 | |
10029 | tdesc_data = tdesc_data_alloc (); | |
10030 | ||
10031 | valid_p = 1; | |
10032 | for (i = 0; i < ARM_SP_REGNUM; i++) | |
10033 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
10034 | arm_register_names[i]); | |
10035 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10036 | ARM_SP_REGNUM, | |
10037 | arm_sp_names); | |
10038 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10039 | ARM_LR_REGNUM, | |
10040 | arm_lr_names); | |
10041 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10042 | ARM_PC_REGNUM, | |
10043 | arm_pc_names); | |
9779414d DJ |
10044 | if (is_m) |
10045 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10046 | ARM_PS_REGNUM, "xpsr"); | |
10047 | else | |
10048 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10049 | ARM_PS_REGNUM, "cpsr"); | |
123dc839 DJ |
10050 | |
10051 | if (!valid_p) | |
10052 | { | |
10053 | tdesc_data_cleanup (tdesc_data); | |
10054 | return NULL; | |
10055 | } | |
10056 | ||
9779414d | 10057 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
10058 | "org.gnu.gdb.arm.fpa"); |
10059 | if (feature != NULL) | |
10060 | { | |
10061 | valid_p = 1; | |
10062 | for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++) | |
10063 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
10064 | arm_register_names[i]); | |
10065 | if (!valid_p) | |
10066 | { | |
10067 | tdesc_data_cleanup (tdesc_data); | |
10068 | return NULL; | |
10069 | } | |
10070 | } | |
ff6f572f DJ |
10071 | else |
10072 | have_fpa_registers = 0; | |
10073 | ||
9779414d | 10074 | feature = tdesc_find_feature (tdesc, |
ff6f572f DJ |
10075 | "org.gnu.gdb.xscale.iwmmxt"); |
10076 | if (feature != NULL) | |
10077 | { | |
10078 | static const char *const iwmmxt_names[] = { | |
10079 | "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7", | |
10080 | "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15", | |
10081 | "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "", | |
10082 | "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "", | |
10083 | }; | |
10084 | ||
10085 | valid_p = 1; | |
10086 | for (i = ARM_WR0_REGNUM; i <= ARM_WR15_REGNUM; i++) | |
10087 | valid_p | |
10088 | &= tdesc_numbered_register (feature, tdesc_data, i, | |
10089 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10090 | ||
10091 | /* Check for the control registers, but do not fail if they | |
10092 | are missing. */ | |
10093 | for (i = ARM_WC0_REGNUM; i <= ARM_WCASF_REGNUM; i++) | |
10094 | tdesc_numbered_register (feature, tdesc_data, i, | |
10095 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10096 | ||
10097 | for (i = ARM_WCGR0_REGNUM; i <= ARM_WCGR3_REGNUM; i++) | |
10098 | valid_p | |
10099 | &= tdesc_numbered_register (feature, tdesc_data, i, | |
10100 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10101 | ||
10102 | if (!valid_p) | |
10103 | { | |
10104 | tdesc_data_cleanup (tdesc_data); | |
10105 | return NULL; | |
10106 | } | |
10107 | } | |
58d6951d DJ |
10108 | |
10109 | /* If we have a VFP unit, check whether the single precision registers | |
10110 | are present. If not, then we will synthesize them as pseudo | |
10111 | registers. */ | |
9779414d | 10112 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
10113 | "org.gnu.gdb.arm.vfp"); |
10114 | if (feature != NULL) | |
10115 | { | |
10116 | static const char *const vfp_double_names[] = { | |
10117 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
10118 | "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", | |
10119 | "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", | |
10120 | "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31", | |
10121 | }; | |
10122 | ||
10123 | /* Require the double precision registers. There must be either | |
10124 | 16 or 32. */ | |
10125 | valid_p = 1; | |
10126 | for (i = 0; i < 32; i++) | |
10127 | { | |
10128 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10129 | ARM_D0_REGNUM + i, | |
10130 | vfp_double_names[i]); | |
10131 | if (!valid_p) | |
10132 | break; | |
10133 | } | |
2b9e5ea6 UW |
10134 | if (!valid_p && i == 16) |
10135 | valid_p = 1; | |
58d6951d | 10136 | |
2b9e5ea6 UW |
10137 | /* Also require FPSCR. */ |
10138 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10139 | ARM_FPSCR_REGNUM, "fpscr"); | |
10140 | if (!valid_p) | |
58d6951d DJ |
10141 | { |
10142 | tdesc_data_cleanup (tdesc_data); | |
10143 | return NULL; | |
10144 | } | |
10145 | ||
10146 | if (tdesc_unnumbered_register (feature, "s0") == 0) | |
10147 | have_vfp_pseudos = 1; | |
10148 | ||
10149 | have_vfp_registers = 1; | |
10150 | ||
10151 | /* If we have VFP, also check for NEON. The architecture allows | |
10152 | NEON without VFP (integer vector operations only), but GDB | |
10153 | does not support that. */ | |
9779414d | 10154 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
10155 | "org.gnu.gdb.arm.neon"); |
10156 | if (feature != NULL) | |
10157 | { | |
10158 | /* NEON requires 32 double-precision registers. */ | |
10159 | if (i != 32) | |
10160 | { | |
10161 | tdesc_data_cleanup (tdesc_data); | |
10162 | return NULL; | |
10163 | } | |
10164 | ||
10165 | /* If there are quad registers defined by the stub, use | |
10166 | their type; otherwise (normally) provide them with | |
10167 | the default type. */ | |
10168 | if (tdesc_unnumbered_register (feature, "q0") == 0) | |
10169 | have_neon_pseudos = 1; | |
10170 | ||
10171 | have_neon = 1; | |
10172 | } | |
10173 | } | |
123dc839 | 10174 | } |
39bbf761 | 10175 | |
28e97307 DJ |
10176 | /* If there is already a candidate, use it. */ |
10177 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
10178 | best_arch != NULL; | |
10179 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
10180 | { | |
b8926edc DJ |
10181 | if (arm_abi != ARM_ABI_AUTO |
10182 | && arm_abi != gdbarch_tdep (best_arch->gdbarch)->arm_abi) | |
28e97307 DJ |
10183 | continue; |
10184 | ||
b8926edc DJ |
10185 | if (fp_model != ARM_FLOAT_AUTO |
10186 | && fp_model != gdbarch_tdep (best_arch->gdbarch)->fp_model) | |
28e97307 DJ |
10187 | continue; |
10188 | ||
58d6951d DJ |
10189 | /* There are various other properties in tdep that we do not |
10190 | need to check here: those derived from a target description, | |
10191 | since gdbarches with a different target description are | |
10192 | automatically disqualified. */ | |
10193 | ||
9779414d DJ |
10194 | /* Do check is_m, though, since it might come from the binary. */ |
10195 | if (is_m != gdbarch_tdep (best_arch->gdbarch)->is_m) | |
10196 | continue; | |
10197 | ||
28e97307 DJ |
10198 | /* Found a match. */ |
10199 | break; | |
10200 | } | |
97e03143 | 10201 | |
28e97307 | 10202 | if (best_arch != NULL) |
123dc839 DJ |
10203 | { |
10204 | if (tdesc_data != NULL) | |
10205 | tdesc_data_cleanup (tdesc_data); | |
10206 | return best_arch->gdbarch; | |
10207 | } | |
28e97307 DJ |
10208 | |
10209 | tdep = xcalloc (1, sizeof (struct gdbarch_tdep)); | |
97e03143 RE |
10210 | gdbarch = gdbarch_alloc (&info, tdep); |
10211 | ||
28e97307 DJ |
10212 | /* Record additional information about the architecture we are defining. |
10213 | These are gdbarch discriminators, like the OSABI. */ | |
10214 | tdep->arm_abi = arm_abi; | |
10215 | tdep->fp_model = fp_model; | |
9779414d | 10216 | tdep->is_m = is_m; |
ff6f572f | 10217 | tdep->have_fpa_registers = have_fpa_registers; |
58d6951d DJ |
10218 | tdep->have_vfp_registers = have_vfp_registers; |
10219 | tdep->have_vfp_pseudos = have_vfp_pseudos; | |
10220 | tdep->have_neon_pseudos = have_neon_pseudos; | |
10221 | tdep->have_neon = have_neon; | |
08216dd7 | 10222 | |
25f8c692 JL |
10223 | arm_register_g_packet_guesses (gdbarch); |
10224 | ||
08216dd7 | 10225 | /* Breakpoints. */ |
9d4fde75 | 10226 | switch (info.byte_order_for_code) |
67255d04 RE |
10227 | { |
10228 | case BFD_ENDIAN_BIG: | |
66e810cd RE |
10229 | tdep->arm_breakpoint = arm_default_arm_be_breakpoint; |
10230 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint); | |
10231 | tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint; | |
10232 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint); | |
10233 | ||
67255d04 RE |
10234 | break; |
10235 | ||
10236 | case BFD_ENDIAN_LITTLE: | |
66e810cd RE |
10237 | tdep->arm_breakpoint = arm_default_arm_le_breakpoint; |
10238 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint); | |
10239 | tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint; | |
10240 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint); | |
10241 | ||
67255d04 RE |
10242 | break; |
10243 | ||
10244 | default: | |
10245 | internal_error (__FILE__, __LINE__, | |
edefbb7c | 10246 | _("arm_gdbarch_init: bad byte order for float format")); |
67255d04 RE |
10247 | } |
10248 | ||
d7b486e7 RE |
10249 | /* On ARM targets char defaults to unsigned. */ |
10250 | set_gdbarch_char_signed (gdbarch, 0); | |
10251 | ||
cca44b1b JB |
10252 | /* Note: for displaced stepping, this includes the breakpoint, and one word |
10253 | of additional scratch space. This setting isn't used for anything beside | |
10254 | displaced stepping at present. */ | |
10255 | set_gdbarch_max_insn_length (gdbarch, 4 * DISPLACED_MODIFIED_INSNS); | |
10256 | ||
9df628e0 | 10257 | /* This should be low enough for everything. */ |
97e03143 | 10258 | tdep->lowest_pc = 0x20; |
94c30b78 | 10259 | tdep->jb_pc = -1; /* Longjump support not enabled by default. */ |
97e03143 | 10260 | |
7c00367c MK |
10261 | /* The default, for both APCS and AAPCS, is to return small |
10262 | structures in registers. */ | |
10263 | tdep->struct_return = reg_struct_return; | |
10264 | ||
2dd604e7 | 10265 | set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call); |
f53f0d0b | 10266 | set_gdbarch_frame_align (gdbarch, arm_frame_align); |
39bbf761 | 10267 | |
756fe439 DJ |
10268 | set_gdbarch_write_pc (gdbarch, arm_write_pc); |
10269 | ||
148754e5 | 10270 | /* Frame handling. */ |
a262aec2 | 10271 | set_gdbarch_dummy_id (gdbarch, arm_dummy_id); |
eb5492fa DJ |
10272 | set_gdbarch_unwind_pc (gdbarch, arm_unwind_pc); |
10273 | set_gdbarch_unwind_sp (gdbarch, arm_unwind_sp); | |
10274 | ||
eb5492fa | 10275 | frame_base_set_default (gdbarch, &arm_normal_base); |
148754e5 | 10276 | |
34e8f22d | 10277 | /* Address manipulation. */ |
34e8f22d RE |
10278 | set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove); |
10279 | ||
34e8f22d RE |
10280 | /* Advance PC across function entry code. */ |
10281 | set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue); | |
10282 | ||
4024ca99 UW |
10283 | /* Detect whether PC is in function epilogue. */ |
10284 | set_gdbarch_in_function_epilogue_p (gdbarch, arm_in_function_epilogue_p); | |
10285 | ||
190dce09 UW |
10286 | /* Skip trampolines. */ |
10287 | set_gdbarch_skip_trampoline_code (gdbarch, arm_skip_stub); | |
10288 | ||
34e8f22d RE |
10289 | /* The stack grows downward. */ |
10290 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
10291 | ||
10292 | /* Breakpoint manipulation. */ | |
10293 | set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc); | |
177321bd DJ |
10294 | set_gdbarch_remote_breakpoint_from_pc (gdbarch, |
10295 | arm_remote_breakpoint_from_pc); | |
34e8f22d RE |
10296 | |
10297 | /* Information about registers, etc. */ | |
34e8f22d RE |
10298 | set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM); |
10299 | set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM); | |
ff6f572f | 10300 | set_gdbarch_num_regs (gdbarch, ARM_NUM_REGS); |
7a5ea0d4 | 10301 | set_gdbarch_register_type (gdbarch, arm_register_type); |
54483882 | 10302 | set_gdbarch_register_reggroup_p (gdbarch, arm_register_reggroup_p); |
34e8f22d | 10303 | |
ff6f572f DJ |
10304 | /* This "info float" is FPA-specific. Use the generic version if we |
10305 | do not have FPA. */ | |
10306 | if (gdbarch_tdep (gdbarch)->have_fpa_registers) | |
10307 | set_gdbarch_print_float_info (gdbarch, arm_print_float_info); | |
10308 | ||
26216b98 | 10309 | /* Internal <-> external register number maps. */ |
ff6f572f | 10310 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, arm_dwarf_reg_to_regnum); |
26216b98 AC |
10311 | set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno); |
10312 | ||
34e8f22d RE |
10313 | set_gdbarch_register_name (gdbarch, arm_register_name); |
10314 | ||
10315 | /* Returning results. */ | |
2af48f68 | 10316 | set_gdbarch_return_value (gdbarch, arm_return_value); |
34e8f22d | 10317 | |
03d48a7d RE |
10318 | /* Disassembly. */ |
10319 | set_gdbarch_print_insn (gdbarch, gdb_print_insn_arm); | |
10320 | ||
34e8f22d RE |
10321 | /* Minsymbol frobbing. */ |
10322 | set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special); | |
10323 | set_gdbarch_coff_make_msymbol_special (gdbarch, | |
10324 | arm_coff_make_msymbol_special); | |
60c5725c | 10325 | set_gdbarch_record_special_symbol (gdbarch, arm_record_special_symbol); |
34e8f22d | 10326 | |
f9d67f43 DJ |
10327 | /* Thumb-2 IT block support. */ |
10328 | set_gdbarch_adjust_breakpoint_address (gdbarch, | |
10329 | arm_adjust_breakpoint_address); | |
10330 | ||
0d5de010 DJ |
10331 | /* Virtual tables. */ |
10332 | set_gdbarch_vbit_in_delta (gdbarch, 1); | |
10333 | ||
97e03143 | 10334 | /* Hook in the ABI-specific overrides, if they have been registered. */ |
4be87837 | 10335 | gdbarch_init_osabi (info, gdbarch); |
97e03143 | 10336 | |
b39cc962 DJ |
10337 | dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg); |
10338 | ||
eb5492fa | 10339 | /* Add some default predicates. */ |
2ae28aa9 YQ |
10340 | if (is_m) |
10341 | frame_unwind_append_unwinder (gdbarch, &arm_m_exception_unwind); | |
a262aec2 DJ |
10342 | frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind); |
10343 | dwarf2_append_unwinders (gdbarch); | |
0e9e9abd | 10344 | frame_unwind_append_unwinder (gdbarch, &arm_exidx_unwind); |
a262aec2 | 10345 | frame_unwind_append_unwinder (gdbarch, &arm_prologue_unwind); |
eb5492fa | 10346 | |
97e03143 RE |
10347 | /* Now we have tuned the configuration, set a few final things, |
10348 | based on what the OS ABI has told us. */ | |
10349 | ||
b8926edc DJ |
10350 | /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI |
10351 | binaries are always marked. */ | |
10352 | if (tdep->arm_abi == ARM_ABI_AUTO) | |
10353 | tdep->arm_abi = ARM_ABI_APCS; | |
10354 | ||
e3039479 UW |
10355 | /* Watchpoints are not steppable. */ |
10356 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); | |
10357 | ||
b8926edc DJ |
10358 | /* We used to default to FPA for generic ARM, but almost nobody |
10359 | uses that now, and we now provide a way for the user to force | |
10360 | the model. So default to the most useful variant. */ | |
10361 | if (tdep->fp_model == ARM_FLOAT_AUTO) | |
10362 | tdep->fp_model = ARM_FLOAT_SOFT_FPA; | |
10363 | ||
9df628e0 RE |
10364 | if (tdep->jb_pc >= 0) |
10365 | set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target); | |
10366 | ||
08216dd7 | 10367 | /* Floating point sizes and format. */ |
8da61cc4 | 10368 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
b8926edc | 10369 | if (tdep->fp_model == ARM_FLOAT_SOFT_FPA || tdep->fp_model == ARM_FLOAT_FPA) |
08216dd7 | 10370 | { |
8da61cc4 DJ |
10371 | set_gdbarch_double_format |
10372 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
10373 | set_gdbarch_long_double_format | |
10374 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
10375 | } | |
10376 | else | |
10377 | { | |
10378 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); | |
10379 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
08216dd7 RE |
10380 | } |
10381 | ||
58d6951d DJ |
10382 | if (have_vfp_pseudos) |
10383 | { | |
10384 | /* NOTE: These are the only pseudo registers used by | |
10385 | the ARM target at the moment. If more are added, a | |
10386 | little more care in numbering will be needed. */ | |
10387 | ||
10388 | int num_pseudos = 32; | |
10389 | if (have_neon_pseudos) | |
10390 | num_pseudos += 16; | |
10391 | set_gdbarch_num_pseudo_regs (gdbarch, num_pseudos); | |
10392 | set_gdbarch_pseudo_register_read (gdbarch, arm_pseudo_read); | |
10393 | set_gdbarch_pseudo_register_write (gdbarch, arm_pseudo_write); | |
10394 | } | |
10395 | ||
123dc839 | 10396 | if (tdesc_data) |
58d6951d DJ |
10397 | { |
10398 | set_tdesc_pseudo_register_name (gdbarch, arm_register_name); | |
10399 | ||
9779414d | 10400 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); |
58d6951d DJ |
10401 | |
10402 | /* Override tdesc_register_type to adjust the types of VFP | |
10403 | registers for NEON. */ | |
10404 | set_gdbarch_register_type (gdbarch, arm_register_type); | |
10405 | } | |
123dc839 DJ |
10406 | |
10407 | /* Add standard register aliases. We add aliases even for those | |
10408 | nanes which are used by the current architecture - it's simpler, | |
10409 | and does no harm, since nothing ever lists user registers. */ | |
10410 | for (i = 0; i < ARRAY_SIZE (arm_register_aliases); i++) | |
10411 | user_reg_add (gdbarch, arm_register_aliases[i].name, | |
10412 | value_of_arm_user_reg, &arm_register_aliases[i].regnum); | |
10413 | ||
39bbf761 RE |
10414 | return gdbarch; |
10415 | } | |
10416 | ||
97e03143 | 10417 | static void |
2af46ca0 | 10418 | arm_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
97e03143 | 10419 | { |
2af46ca0 | 10420 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
97e03143 RE |
10421 | |
10422 | if (tdep == NULL) | |
10423 | return; | |
10424 | ||
edefbb7c | 10425 | fprintf_unfiltered (file, _("arm_dump_tdep: Lowest pc = 0x%lx"), |
97e03143 RE |
10426 | (unsigned long) tdep->lowest_pc); |
10427 | } | |
10428 | ||
a78f21af AC |
10429 | extern initialize_file_ftype _initialize_arm_tdep; /* -Wmissing-prototypes */ |
10430 | ||
c906108c | 10431 | void |
ed9a39eb | 10432 | _initialize_arm_tdep (void) |
c906108c | 10433 | { |
bc90b915 FN |
10434 | struct ui_file *stb; |
10435 | long length; | |
26304000 | 10436 | struct cmd_list_element *new_set, *new_show; |
53904c9e AC |
10437 | const char *setname; |
10438 | const char *setdesc; | |
4bd7b427 | 10439 | const char *const *regnames; |
bc90b915 FN |
10440 | int numregs, i, j; |
10441 | static char *helptext; | |
edefbb7c AC |
10442 | char regdesc[1024], *rdptr = regdesc; |
10443 | size_t rest = sizeof (regdesc); | |
085dd6e6 | 10444 | |
42cf1509 | 10445 | gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep); |
97e03143 | 10446 | |
60c5725c | 10447 | arm_objfile_data_key |
c1bd65d0 | 10448 | = register_objfile_data_with_cleanup (NULL, arm_objfile_data_free); |
60c5725c | 10449 | |
0e9e9abd UW |
10450 | /* Add ourselves to objfile event chain. */ |
10451 | observer_attach_new_objfile (arm_exidx_new_objfile); | |
10452 | arm_exidx_data_key | |
10453 | = register_objfile_data_with_cleanup (NULL, arm_exidx_data_free); | |
10454 | ||
70f80edf JT |
10455 | /* Register an ELF OS ABI sniffer for ARM binaries. */ |
10456 | gdbarch_register_osabi_sniffer (bfd_arch_arm, | |
10457 | bfd_target_elf_flavour, | |
10458 | arm_elf_osabi_sniffer); | |
10459 | ||
9779414d DJ |
10460 | /* Initialize the standard target descriptions. */ |
10461 | initialize_tdesc_arm_with_m (); | |
25f8c692 | 10462 | initialize_tdesc_arm_with_m_fpa_layout (); |
3184d3f9 | 10463 | initialize_tdesc_arm_with_m_vfp_d16 (); |
ef7e8358 UW |
10464 | initialize_tdesc_arm_with_iwmmxt (); |
10465 | initialize_tdesc_arm_with_vfpv2 (); | |
10466 | initialize_tdesc_arm_with_vfpv3 (); | |
10467 | initialize_tdesc_arm_with_neon (); | |
9779414d | 10468 | |
94c30b78 | 10469 | /* Get the number of possible sets of register names defined in opcodes. */ |
afd7eef0 RE |
10470 | num_disassembly_options = get_arm_regname_num_options (); |
10471 | ||
10472 | /* Add root prefix command for all "set arm"/"show arm" commands. */ | |
10473 | add_prefix_cmd ("arm", no_class, set_arm_command, | |
edefbb7c | 10474 | _("Various ARM-specific commands."), |
afd7eef0 RE |
10475 | &setarmcmdlist, "set arm ", 0, &setlist); |
10476 | ||
10477 | add_prefix_cmd ("arm", no_class, show_arm_command, | |
edefbb7c | 10478 | _("Various ARM-specific commands."), |
afd7eef0 | 10479 | &showarmcmdlist, "show arm ", 0, &showlist); |
bc90b915 | 10480 | |
94c30b78 | 10481 | /* Sync the opcode insn printer with our register viewer. */ |
bc90b915 | 10482 | parse_arm_disassembler_option ("reg-names-std"); |
c5aa993b | 10483 | |
eefe576e AC |
10484 | /* Initialize the array that will be passed to |
10485 | add_setshow_enum_cmd(). */ | |
afd7eef0 RE |
10486 | valid_disassembly_styles |
10487 | = xmalloc ((num_disassembly_options + 1) * sizeof (char *)); | |
10488 | for (i = 0; i < num_disassembly_options; i++) | |
bc90b915 FN |
10489 | { |
10490 | numregs = get_arm_regnames (i, &setname, &setdesc, ®names); | |
afd7eef0 | 10491 | valid_disassembly_styles[i] = setname; |
edefbb7c AC |
10492 | length = snprintf (rdptr, rest, "%s - %s\n", setname, setdesc); |
10493 | rdptr += length; | |
10494 | rest -= length; | |
123dc839 DJ |
10495 | /* When we find the default names, tell the disassembler to use |
10496 | them. */ | |
bc90b915 FN |
10497 | if (!strcmp (setname, "std")) |
10498 | { | |
afd7eef0 | 10499 | disassembly_style = setname; |
bc90b915 FN |
10500 | set_arm_regname_option (i); |
10501 | } | |
10502 | } | |
94c30b78 | 10503 | /* Mark the end of valid options. */ |
afd7eef0 | 10504 | valid_disassembly_styles[num_disassembly_options] = NULL; |
c906108c | 10505 | |
edefbb7c AC |
10506 | /* Create the help text. */ |
10507 | stb = mem_fileopen (); | |
10508 | fprintf_unfiltered (stb, "%s%s%s", | |
10509 | _("The valid values are:\n"), | |
10510 | regdesc, | |
10511 | _("The default is \"std\".")); | |
759ef836 | 10512 | helptext = ui_file_xstrdup (stb, NULL); |
bc90b915 | 10513 | ui_file_delete (stb); |
ed9a39eb | 10514 | |
edefbb7c AC |
10515 | add_setshow_enum_cmd("disassembler", no_class, |
10516 | valid_disassembly_styles, &disassembly_style, | |
10517 | _("Set the disassembly style."), | |
10518 | _("Show the disassembly style."), | |
10519 | helptext, | |
2c5b56ce | 10520 | set_disassembly_style_sfunc, |
0963b4bd MS |
10521 | NULL, /* FIXME: i18n: The disassembly style is |
10522 | \"%s\". */ | |
7376b4c2 | 10523 | &setarmcmdlist, &showarmcmdlist); |
edefbb7c AC |
10524 | |
10525 | add_setshow_boolean_cmd ("apcs32", no_class, &arm_apcs_32, | |
10526 | _("Set usage of ARM 32-bit mode."), | |
10527 | _("Show usage of ARM 32-bit mode."), | |
10528 | _("When off, a 26-bit PC will be used."), | |
2c5b56ce | 10529 | NULL, |
0963b4bd MS |
10530 | NULL, /* FIXME: i18n: Usage of ARM 32-bit |
10531 | mode is %s. */ | |
26304000 | 10532 | &setarmcmdlist, &showarmcmdlist); |
c906108c | 10533 | |
fd50bc42 | 10534 | /* Add a command to allow the user to force the FPU model. */ |
edefbb7c AC |
10535 | add_setshow_enum_cmd ("fpu", no_class, fp_model_strings, ¤t_fp_model, |
10536 | _("Set the floating point type."), | |
10537 | _("Show the floating point type."), | |
10538 | _("auto - Determine the FP typefrom the OS-ABI.\n\ | |
10539 | softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\ | |
10540 | fpa - FPA co-processor (GCC compiled).\n\ | |
10541 | softvfp - Software FP with pure-endian doubles.\n\ | |
10542 | vfp - VFP co-processor."), | |
edefbb7c | 10543 | set_fp_model_sfunc, show_fp_model, |
7376b4c2 | 10544 | &setarmcmdlist, &showarmcmdlist); |
fd50bc42 | 10545 | |
28e97307 DJ |
10546 | /* Add a command to allow the user to force the ABI. */ |
10547 | add_setshow_enum_cmd ("abi", class_support, arm_abi_strings, &arm_abi_string, | |
10548 | _("Set the ABI."), | |
10549 | _("Show the ABI."), | |
10550 | NULL, arm_set_abi, arm_show_abi, | |
10551 | &setarmcmdlist, &showarmcmdlist); | |
10552 | ||
0428b8f5 DJ |
10553 | /* Add two commands to allow the user to force the assumed |
10554 | execution mode. */ | |
10555 | add_setshow_enum_cmd ("fallback-mode", class_support, | |
10556 | arm_mode_strings, &arm_fallback_mode_string, | |
10557 | _("Set the mode assumed when symbols are unavailable."), | |
10558 | _("Show the mode assumed when symbols are unavailable."), | |
10559 | NULL, NULL, arm_show_fallback_mode, | |
10560 | &setarmcmdlist, &showarmcmdlist); | |
10561 | add_setshow_enum_cmd ("force-mode", class_support, | |
10562 | arm_mode_strings, &arm_force_mode_string, | |
10563 | _("Set the mode assumed even when symbols are available."), | |
10564 | _("Show the mode assumed even when symbols are available."), | |
10565 | NULL, NULL, arm_show_force_mode, | |
10566 | &setarmcmdlist, &showarmcmdlist); | |
10567 | ||
6529d2dd | 10568 | /* Debugging flag. */ |
edefbb7c AC |
10569 | add_setshow_boolean_cmd ("arm", class_maintenance, &arm_debug, |
10570 | _("Set ARM debugging."), | |
10571 | _("Show ARM debugging."), | |
10572 | _("When on, arm-specific debugging is enabled."), | |
2c5b56ce | 10573 | NULL, |
7915a72c | 10574 | NULL, /* FIXME: i18n: "ARM debugging is %s. */ |
26304000 | 10575 | &setdebuglist, &showdebuglist); |
c906108c | 10576 | } |
72508ac0 PO |
10577 | |
10578 | /* ARM-reversible process record data structures. */ | |
10579 | ||
10580 | #define ARM_INSN_SIZE_BYTES 4 | |
10581 | #define THUMB_INSN_SIZE_BYTES 2 | |
10582 | #define THUMB2_INSN_SIZE_BYTES 4 | |
10583 | ||
10584 | ||
10585 | #define INSN_S_L_BIT_NUM 20 | |
10586 | ||
10587 | #define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \ | |
10588 | do \ | |
10589 | { \ | |
10590 | unsigned int reg_len = LENGTH; \ | |
10591 | if (reg_len) \ | |
10592 | { \ | |
10593 | REGS = XNEWVEC (uint32_t, reg_len); \ | |
10594 | memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \ | |
10595 | } \ | |
10596 | } \ | |
10597 | while (0) | |
10598 | ||
10599 | #define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \ | |
10600 | do \ | |
10601 | { \ | |
10602 | unsigned int mem_len = LENGTH; \ | |
10603 | if (mem_len) \ | |
10604 | { \ | |
10605 | MEMS = XNEWVEC (struct arm_mem_r, mem_len); \ | |
10606 | memcpy(&MEMS->len, &RECORD_BUF[0], \ | |
10607 | sizeof(struct arm_mem_r) * LENGTH); \ | |
10608 | } \ | |
10609 | } \ | |
10610 | while (0) | |
10611 | ||
10612 | /* Checks whether insn is already recorded or yet to be decoded. (boolean expression). */ | |
10613 | #define INSN_RECORDED(ARM_RECORD) \ | |
10614 | (0 != (ARM_RECORD)->reg_rec_count || 0 != (ARM_RECORD)->mem_rec_count) | |
10615 | ||
10616 | /* ARM memory record structure. */ | |
10617 | struct arm_mem_r | |
10618 | { | |
10619 | uint32_t len; /* Record length. */ | |
10620 | CORE_ADDR addr; /* Memory address. */ | |
10621 | }; | |
10622 | ||
10623 | /* ARM instruction record contains opcode of current insn | |
10624 | and execution state (before entry to decode_insn()), | |
10625 | contains list of to-be-modified registers and | |
10626 | memory blocks (on return from decode_insn()). */ | |
10627 | ||
10628 | typedef struct insn_decode_record_t | |
10629 | { | |
10630 | struct gdbarch *gdbarch; | |
10631 | struct regcache *regcache; | |
10632 | CORE_ADDR this_addr; /* Address of the insn being decoded. */ | |
10633 | uint32_t arm_insn; /* Should accommodate thumb. */ | |
10634 | uint32_t cond; /* Condition code. */ | |
10635 | uint32_t opcode; /* Insn opcode. */ | |
10636 | uint32_t decode; /* Insn decode bits. */ | |
10637 | uint32_t mem_rec_count; /* No of mem records. */ | |
10638 | uint32_t reg_rec_count; /* No of reg records. */ | |
10639 | uint32_t *arm_regs; /* Registers to be saved for this record. */ | |
10640 | struct arm_mem_r *arm_mems; /* Memory to be saved for this record. */ | |
10641 | } insn_decode_record; | |
10642 | ||
10643 | ||
10644 | /* Checks ARM SBZ and SBO mandatory fields. */ | |
10645 | ||
10646 | static int | |
10647 | sbo_sbz (uint32_t insn, uint32_t bit_num, uint32_t len, uint32_t sbo) | |
10648 | { | |
10649 | uint32_t ones = bits (insn, bit_num - 1, (bit_num -1) + (len - 1)); | |
10650 | ||
10651 | if (!len) | |
10652 | return 1; | |
10653 | ||
10654 | if (!sbo) | |
10655 | ones = ~ones; | |
10656 | ||
10657 | while (ones) | |
10658 | { | |
10659 | if (!(ones & sbo)) | |
10660 | { | |
10661 | return 0; | |
10662 | } | |
10663 | ones = ones >> 1; | |
10664 | } | |
10665 | return 1; | |
10666 | } | |
10667 | ||
10668 | typedef enum | |
10669 | { | |
10670 | ARM_RECORD_STRH=1, | |
10671 | ARM_RECORD_STRD | |
10672 | } arm_record_strx_t; | |
10673 | ||
10674 | typedef enum | |
10675 | { | |
10676 | ARM_RECORD=1, | |
10677 | THUMB_RECORD, | |
10678 | THUMB2_RECORD | |
10679 | } record_type_t; | |
10680 | ||
10681 | ||
10682 | static int | |
10683 | arm_record_strx (insn_decode_record *arm_insn_r, uint32_t *record_buf, | |
10684 | uint32_t *record_buf_mem, arm_record_strx_t str_type) | |
10685 | { | |
10686 | ||
10687 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10688 | ULONGEST u_regval[2]= {0}; | |
10689 | ||
10690 | uint32_t reg_src1 = 0, reg_src2 = 0; | |
10691 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; | |
10692 | uint32_t opcode1 = 0; | |
10693 | ||
10694 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
10695 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
10696 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); | |
10697 | ||
10698 | ||
10699 | if (14 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
10700 | { | |
10701 | /* 1) Handle misc store, immediate offset. */ | |
10702 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); | |
10703 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); | |
10704 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
10705 | regcache_raw_read_unsigned (reg_cache, reg_src1, | |
10706 | &u_regval[0]); | |
10707 | if (ARM_PC_REGNUM == reg_src1) | |
10708 | { | |
10709 | /* If R15 was used as Rn, hence current PC+8. */ | |
10710 | u_regval[0] = u_regval[0] + 8; | |
10711 | } | |
10712 | offset_8 = (immed_high << 4) | immed_low; | |
10713 | /* Calculate target store address. */ | |
10714 | if (14 == arm_insn_r->opcode) | |
10715 | { | |
10716 | tgt_mem_addr = u_regval[0] + offset_8; | |
10717 | } | |
10718 | else | |
10719 | { | |
10720 | tgt_mem_addr = u_regval[0] - offset_8; | |
10721 | } | |
10722 | if (ARM_RECORD_STRH == str_type) | |
10723 | { | |
10724 | record_buf_mem[0] = 2; | |
10725 | record_buf_mem[1] = tgt_mem_addr; | |
10726 | arm_insn_r->mem_rec_count = 1; | |
10727 | } | |
10728 | else if (ARM_RECORD_STRD == str_type) | |
10729 | { | |
10730 | record_buf_mem[0] = 4; | |
10731 | record_buf_mem[1] = tgt_mem_addr; | |
10732 | record_buf_mem[2] = 4; | |
10733 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10734 | arm_insn_r->mem_rec_count = 2; | |
10735 | } | |
10736 | } | |
10737 | else if (12 == arm_insn_r->opcode || 8 == arm_insn_r->opcode) | |
10738 | { | |
10739 | /* 2) Store, register offset. */ | |
10740 | /* Get Rm. */ | |
10741 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
10742 | /* Get Rn. */ | |
10743 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
10744 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10745 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
10746 | if (15 == reg_src2) | |
10747 | { | |
10748 | /* If R15 was used as Rn, hence current PC+8. */ | |
10749 | u_regval[0] = u_regval[0] + 8; | |
10750 | } | |
10751 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10752 | if (12 == arm_insn_r->opcode) | |
10753 | { | |
10754 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
10755 | } | |
10756 | else | |
10757 | { | |
10758 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
10759 | } | |
10760 | if (ARM_RECORD_STRH == str_type) | |
10761 | { | |
10762 | record_buf_mem[0] = 2; | |
10763 | record_buf_mem[1] = tgt_mem_addr; | |
10764 | arm_insn_r->mem_rec_count = 1; | |
10765 | } | |
10766 | else if (ARM_RECORD_STRD == str_type) | |
10767 | { | |
10768 | record_buf_mem[0] = 4; | |
10769 | record_buf_mem[1] = tgt_mem_addr; | |
10770 | record_buf_mem[2] = 4; | |
10771 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10772 | arm_insn_r->mem_rec_count = 2; | |
10773 | } | |
10774 | } | |
10775 | else if (11 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
10776 | || 2 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) | |
10777 | { | |
10778 | /* 3) Store, immediate pre-indexed. */ | |
10779 | /* 5) Store, immediate post-indexed. */ | |
10780 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); | |
10781 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); | |
10782 | offset_8 = (immed_high << 4) | immed_low; | |
10783 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
10784 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10785 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10786 | if (15 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) | |
10787 | { | |
10788 | tgt_mem_addr = u_regval[0] + offset_8; | |
10789 | } | |
10790 | else | |
10791 | { | |
10792 | tgt_mem_addr = u_regval[0] - offset_8; | |
10793 | } | |
10794 | if (ARM_RECORD_STRH == str_type) | |
10795 | { | |
10796 | record_buf_mem[0] = 2; | |
10797 | record_buf_mem[1] = tgt_mem_addr; | |
10798 | arm_insn_r->mem_rec_count = 1; | |
10799 | } | |
10800 | else if (ARM_RECORD_STRD == str_type) | |
10801 | { | |
10802 | record_buf_mem[0] = 4; | |
10803 | record_buf_mem[1] = tgt_mem_addr; | |
10804 | record_buf_mem[2] = 4; | |
10805 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10806 | arm_insn_r->mem_rec_count = 2; | |
10807 | } | |
10808 | /* Record Rn also as it changes. */ | |
10809 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); | |
10810 | arm_insn_r->reg_rec_count = 1; | |
10811 | } | |
10812 | else if (9 == arm_insn_r->opcode || 13 == arm_insn_r->opcode | |
10813 | || 0 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) | |
10814 | { | |
10815 | /* 4) Store, register pre-indexed. */ | |
10816 | /* 6) Store, register post -indexed. */ | |
10817 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
10818 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
10819 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10820 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
10821 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10822 | if (13 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) | |
10823 | { | |
10824 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
10825 | } | |
10826 | else | |
10827 | { | |
10828 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
10829 | } | |
10830 | if (ARM_RECORD_STRH == str_type) | |
10831 | { | |
10832 | record_buf_mem[0] = 2; | |
10833 | record_buf_mem[1] = tgt_mem_addr; | |
10834 | arm_insn_r->mem_rec_count = 1; | |
10835 | } | |
10836 | else if (ARM_RECORD_STRD == str_type) | |
10837 | { | |
10838 | record_buf_mem[0] = 4; | |
10839 | record_buf_mem[1] = tgt_mem_addr; | |
10840 | record_buf_mem[2] = 4; | |
10841 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10842 | arm_insn_r->mem_rec_count = 2; | |
10843 | } | |
10844 | /* Record Rn also as it changes. */ | |
10845 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); | |
10846 | arm_insn_r->reg_rec_count = 1; | |
10847 | } | |
10848 | return 0; | |
10849 | } | |
10850 | ||
10851 | /* Handling ARM extension space insns. */ | |
10852 | ||
10853 | static int | |
10854 | arm_record_extension_space (insn_decode_record *arm_insn_r) | |
10855 | { | |
10856 | uint32_t ret = 0; /* Return value: -1:record failure ; 0:success */ | |
10857 | uint32_t opcode1 = 0, opcode2 = 0, insn_op1 = 0; | |
10858 | uint32_t record_buf[8], record_buf_mem[8]; | |
10859 | uint32_t reg_src1 = 0; | |
10860 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; | |
10861 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10862 | ULONGEST u_regval = 0; | |
10863 | ||
10864 | gdb_assert (!INSN_RECORDED(arm_insn_r)); | |
10865 | /* Handle unconditional insn extension space. */ | |
10866 | ||
10867 | opcode1 = bits (arm_insn_r->arm_insn, 20, 27); | |
10868 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); | |
10869 | if (arm_insn_r->cond) | |
10870 | { | |
10871 | /* PLD has no affect on architectural state, it just affects | |
10872 | the caches. */ | |
10873 | if (5 == ((opcode1 & 0xE0) >> 5)) | |
10874 | { | |
10875 | /* BLX(1) */ | |
10876 | record_buf[0] = ARM_PS_REGNUM; | |
10877 | record_buf[1] = ARM_LR_REGNUM; | |
10878 | arm_insn_r->reg_rec_count = 2; | |
10879 | } | |
10880 | /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */ | |
10881 | } | |
10882 | ||
10883 | ||
10884 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); | |
10885 | if (3 == opcode1 && bit (arm_insn_r->arm_insn, 4)) | |
10886 | { | |
10887 | ret = -1; | |
10888 | /* Undefined instruction on ARM V5; need to handle if later | |
10889 | versions define it. */ | |
10890 | } | |
10891 | ||
10892 | opcode1 = bits (arm_insn_r->arm_insn, 24, 27); | |
10893 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); | |
10894 | insn_op1 = bits (arm_insn_r->arm_insn, 20, 23); | |
10895 | ||
10896 | /* Handle arithmetic insn extension space. */ | |
10897 | if (!opcode1 && 9 == opcode2 && 1 != arm_insn_r->cond | |
10898 | && !INSN_RECORDED(arm_insn_r)) | |
10899 | { | |
10900 | /* Handle MLA(S) and MUL(S). */ | |
10901 | if (0 <= insn_op1 && 3 >= insn_op1) | |
10902 | { | |
10903 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10904 | record_buf[1] = ARM_PS_REGNUM; | |
10905 | arm_insn_r->reg_rec_count = 2; | |
10906 | } | |
10907 | else if (4 <= insn_op1 && 15 >= insn_op1) | |
10908 | { | |
10909 | /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */ | |
10910 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
10911 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
10912 | record_buf[2] = ARM_PS_REGNUM; | |
10913 | arm_insn_r->reg_rec_count = 3; | |
10914 | } | |
10915 | } | |
10916 | ||
10917 | opcode1 = bits (arm_insn_r->arm_insn, 26, 27); | |
10918 | opcode2 = bits (arm_insn_r->arm_insn, 23, 24); | |
10919 | insn_op1 = bits (arm_insn_r->arm_insn, 21, 22); | |
10920 | ||
10921 | /* Handle control insn extension space. */ | |
10922 | ||
10923 | if (!opcode1 && 2 == opcode2 && !bit (arm_insn_r->arm_insn, 20) | |
10924 | && 1 != arm_insn_r->cond && !INSN_RECORDED(arm_insn_r)) | |
10925 | { | |
10926 | if (!bit (arm_insn_r->arm_insn,25)) | |
10927 | { | |
10928 | if (!bits (arm_insn_r->arm_insn, 4, 7)) | |
10929 | { | |
10930 | if ((0 == insn_op1) || (2 == insn_op1)) | |
10931 | { | |
10932 | /* MRS. */ | |
10933 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10934 | arm_insn_r->reg_rec_count = 1; | |
10935 | } | |
10936 | else if (1 == insn_op1) | |
10937 | { | |
10938 | /* CSPR is going to be changed. */ | |
10939 | record_buf[0] = ARM_PS_REGNUM; | |
10940 | arm_insn_r->reg_rec_count = 1; | |
10941 | } | |
10942 | else if (3 == insn_op1) | |
10943 | { | |
10944 | /* SPSR is going to be changed. */ | |
10945 | /* We need to get SPSR value, which is yet to be done. */ | |
10946 | printf_unfiltered (_("Process record does not support " | |
10947 | "instruction 0x%0x at address %s.\n"), | |
10948 | arm_insn_r->arm_insn, | |
10949 | paddress (arm_insn_r->gdbarch, | |
10950 | arm_insn_r->this_addr)); | |
10951 | return -1; | |
10952 | } | |
10953 | } | |
10954 | else if (1 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10955 | { | |
10956 | if (1 == insn_op1) | |
10957 | { | |
10958 | /* BX. */ | |
10959 | record_buf[0] = ARM_PS_REGNUM; | |
10960 | arm_insn_r->reg_rec_count = 1; | |
10961 | } | |
10962 | else if (3 == insn_op1) | |
10963 | { | |
10964 | /* CLZ. */ | |
10965 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10966 | arm_insn_r->reg_rec_count = 1; | |
10967 | } | |
10968 | } | |
10969 | else if (3 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10970 | { | |
10971 | /* BLX. */ | |
10972 | record_buf[0] = ARM_PS_REGNUM; | |
10973 | record_buf[1] = ARM_LR_REGNUM; | |
10974 | arm_insn_r->reg_rec_count = 2; | |
10975 | } | |
10976 | else if (5 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10977 | { | |
10978 | /* QADD, QSUB, QDADD, QDSUB */ | |
10979 | record_buf[0] = ARM_PS_REGNUM; | |
10980 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
10981 | arm_insn_r->reg_rec_count = 2; | |
10982 | } | |
10983 | else if (7 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10984 | { | |
10985 | /* BKPT. */ | |
10986 | record_buf[0] = ARM_PS_REGNUM; | |
10987 | record_buf[1] = ARM_LR_REGNUM; | |
10988 | arm_insn_r->reg_rec_count = 2; | |
10989 | ||
10990 | /* Save SPSR also;how? */ | |
10991 | printf_unfiltered (_("Process record does not support " | |
10992 | "instruction 0x%0x at address %s.\n"), | |
10993 | arm_insn_r->arm_insn, | |
10994 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
10995 | return -1; | |
10996 | } | |
10997 | else if(8 == bits (arm_insn_r->arm_insn, 4, 7) | |
10998 | || 10 == bits (arm_insn_r->arm_insn, 4, 7) | |
10999 | || 12 == bits (arm_insn_r->arm_insn, 4, 7) | |
11000 | || 14 == bits (arm_insn_r->arm_insn, 4, 7) | |
11001 | ) | |
11002 | { | |
11003 | if (0 == insn_op1 || 1 == insn_op1) | |
11004 | { | |
11005 | /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */ | |
11006 | /* We dont do optimization for SMULW<y> where we | |
11007 | need only Rd. */ | |
11008 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11009 | record_buf[1] = ARM_PS_REGNUM; | |
11010 | arm_insn_r->reg_rec_count = 2; | |
11011 | } | |
11012 | else if (2 == insn_op1) | |
11013 | { | |
11014 | /* SMLAL<x><y>. */ | |
11015 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11016 | record_buf[1] = bits (arm_insn_r->arm_insn, 16, 19); | |
11017 | arm_insn_r->reg_rec_count = 2; | |
11018 | } | |
11019 | else if (3 == insn_op1) | |
11020 | { | |
11021 | /* SMUL<x><y>. */ | |
11022 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11023 | arm_insn_r->reg_rec_count = 1; | |
11024 | } | |
11025 | } | |
11026 | } | |
11027 | else | |
11028 | { | |
11029 | /* MSR : immediate form. */ | |
11030 | if (1 == insn_op1) | |
11031 | { | |
11032 | /* CSPR is going to be changed. */ | |
11033 | record_buf[0] = ARM_PS_REGNUM; | |
11034 | arm_insn_r->reg_rec_count = 1; | |
11035 | } | |
11036 | else if (3 == insn_op1) | |
11037 | { | |
11038 | /* SPSR is going to be changed. */ | |
11039 | /* we need to get SPSR value, which is yet to be done */ | |
11040 | printf_unfiltered (_("Process record does not support " | |
11041 | "instruction 0x%0x at address %s.\n"), | |
11042 | arm_insn_r->arm_insn, | |
11043 | paddress (arm_insn_r->gdbarch, | |
11044 | arm_insn_r->this_addr)); | |
11045 | return -1; | |
11046 | } | |
11047 | } | |
11048 | } | |
11049 | ||
11050 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); | |
11051 | opcode2 = bits (arm_insn_r->arm_insn, 20, 24); | |
11052 | insn_op1 = bits (arm_insn_r->arm_insn, 5, 6); | |
11053 | ||
11054 | /* Handle load/store insn extension space. */ | |
11055 | ||
11056 | if (!opcode1 && bit (arm_insn_r->arm_insn, 7) | |
11057 | && bit (arm_insn_r->arm_insn, 4) && 1 != arm_insn_r->cond | |
11058 | && !INSN_RECORDED(arm_insn_r)) | |
11059 | { | |
11060 | /* SWP/SWPB. */ | |
11061 | if (0 == insn_op1) | |
11062 | { | |
11063 | /* These insn, changes register and memory as well. */ | |
11064 | /* SWP or SWPB insn. */ | |
11065 | /* Get memory address given by Rn. */ | |
11066 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11067 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
11068 | /* SWP insn ?, swaps word. */ | |
11069 | if (8 == arm_insn_r->opcode) | |
11070 | { | |
11071 | record_buf_mem[0] = 4; | |
11072 | } | |
11073 | else | |
11074 | { | |
11075 | /* SWPB insn, swaps only byte. */ | |
11076 | record_buf_mem[0] = 1; | |
11077 | } | |
11078 | record_buf_mem[1] = u_regval; | |
11079 | arm_insn_r->mem_rec_count = 1; | |
11080 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11081 | arm_insn_r->reg_rec_count = 1; | |
11082 | } | |
11083 | else if (1 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11084 | { | |
11085 | /* STRH. */ | |
11086 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11087 | ARM_RECORD_STRH); | |
11088 | } | |
11089 | else if (2 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11090 | { | |
11091 | /* LDRD. */ | |
11092 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11093 | record_buf[1] = record_buf[0] + 1; | |
11094 | arm_insn_r->reg_rec_count = 2; | |
11095 | } | |
11096 | else if (3 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11097 | { | |
11098 | /* STRD. */ | |
11099 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11100 | ARM_RECORD_STRD); | |
11101 | } | |
11102 | else if (bit (arm_insn_r->arm_insn, 20) && insn_op1 <= 3) | |
11103 | { | |
11104 | /* LDRH, LDRSB, LDRSH. */ | |
11105 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11106 | arm_insn_r->reg_rec_count = 1; | |
11107 | } | |
11108 | ||
11109 | } | |
11110 | ||
11111 | opcode1 = bits (arm_insn_r->arm_insn, 23, 27); | |
11112 | if (24 == opcode1 && bit (arm_insn_r->arm_insn, 21) | |
11113 | && !INSN_RECORDED(arm_insn_r)) | |
11114 | { | |
11115 | ret = -1; | |
11116 | /* Handle coprocessor insn extension space. */ | |
11117 | } | |
11118 | ||
11119 | /* To be done for ARMv5 and later; as of now we return -1. */ | |
11120 | if (-1 == ret) | |
11121 | printf_unfiltered (_("Process record does not support instruction x%0x " | |
11122 | "at address %s.\n"),arm_insn_r->arm_insn, | |
11123 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11124 | ||
11125 | ||
11126 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11127 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11128 | ||
11129 | return ret; | |
11130 | } | |
11131 | ||
11132 | /* Handling opcode 000 insns. */ | |
11133 | ||
11134 | static int | |
11135 | arm_record_data_proc_misc_ld_str (insn_decode_record *arm_insn_r) | |
11136 | { | |
11137 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11138 | uint32_t record_buf[8], record_buf_mem[8]; | |
11139 | ULONGEST u_regval[2] = {0}; | |
11140 | ||
11141 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; | |
11142 | uint32_t immed_high = 0, immed_low = 0, offset_8 = 0, tgt_mem_addr = 0; | |
11143 | uint32_t opcode1 = 0; | |
11144 | ||
11145 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11146 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11147 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); | |
11148 | ||
11149 | /* Data processing insn /multiply insn. */ | |
11150 | if (9 == arm_insn_r->decode | |
11151 | && ((4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) | |
11152 | || (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode))) | |
11153 | { | |
11154 | /* Handle multiply instructions. */ | |
11155 | /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */ | |
11156 | if (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode) | |
11157 | { | |
11158 | /* Handle MLA and MUL. */ | |
11159 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
11160 | record_buf[1] = ARM_PS_REGNUM; | |
11161 | arm_insn_r->reg_rec_count = 2; | |
11162 | } | |
11163 | else if (4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) | |
11164 | { | |
11165 | /* Handle SMLAL, SMULL, UMLAL, UMULL. */ | |
11166 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
11167 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
11168 | record_buf[2] = ARM_PS_REGNUM; | |
11169 | arm_insn_r->reg_rec_count = 3; | |
11170 | } | |
11171 | } | |
11172 | else if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) | |
11173 | && (11 == arm_insn_r->decode || 13 == arm_insn_r->decode)) | |
11174 | { | |
11175 | /* Handle misc load insns, as 20th bit (L = 1). */ | |
11176 | /* LDR insn has a capability to do branching, if | |
11177 | MOV LR, PC is precceded by LDR insn having Rn as R15 | |
11178 | in that case, it emulates branch and link insn, and hence we | |
11179 | need to save CSPR and PC as well. I am not sure this is right | |
11180 | place; as opcode = 010 LDR insn make this happen, if R15 was | |
11181 | used. */ | |
11182 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11183 | if (15 != reg_dest) | |
11184 | { | |
11185 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11186 | arm_insn_r->reg_rec_count = 1; | |
11187 | } | |
11188 | else | |
11189 | { | |
11190 | record_buf[0] = reg_dest; | |
11191 | record_buf[1] = ARM_PS_REGNUM; | |
11192 | arm_insn_r->reg_rec_count = 2; | |
11193 | } | |
11194 | } | |
11195 | else if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) | |
11196 | && sbo_sbz (arm_insn_r->arm_insn, 5, 12, 0) | |
11197 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) | |
11198 | && 2 == bits (arm_insn_r->arm_insn, 20, 21)) | |
11199 | { | |
11200 | /* Handle MSR insn. */ | |
11201 | if (9 == arm_insn_r->opcode) | |
11202 | { | |
11203 | /* CSPR is going to be changed. */ | |
11204 | record_buf[0] = ARM_PS_REGNUM; | |
11205 | arm_insn_r->reg_rec_count = 1; | |
11206 | } | |
11207 | else | |
11208 | { | |
11209 | /* SPSR is going to be changed. */ | |
11210 | /* How to read SPSR value? */ | |
11211 | printf_unfiltered (_("Process record does not support instruction " | |
11212 | "0x%0x at address %s.\n"), | |
11213 | arm_insn_r->arm_insn, | |
11214 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11215 | return -1; | |
11216 | } | |
11217 | } | |
11218 | else if (9 == arm_insn_r->decode | |
11219 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
11220 | && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11221 | { | |
11222 | /* Handling SWP, SWPB. */ | |
11223 | /* These insn, changes register and memory as well. */ | |
11224 | /* SWP or SWPB insn. */ | |
11225 | ||
11226 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11227 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11228 | /* SWP insn ?, swaps word. */ | |
11229 | if (8 == arm_insn_r->opcode) | |
11230 | { | |
11231 | record_buf_mem[0] = 4; | |
11232 | } | |
11233 | else | |
11234 | { | |
11235 | /* SWPB insn, swaps only byte. */ | |
11236 | record_buf_mem[0] = 1; | |
11237 | } | |
11238 | record_buf_mem[1] = u_regval[0]; | |
11239 | arm_insn_r->mem_rec_count = 1; | |
11240 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11241 | arm_insn_r->reg_rec_count = 1; | |
11242 | } | |
11243 | else if (3 == arm_insn_r->decode && 0x12 == opcode1 | |
11244 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) | |
11245 | { | |
11246 | /* Handle BLX, branch and link/exchange. */ | |
11247 | if (9 == arm_insn_r->opcode) | |
11248 | { | |
11249 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm, | |
11250 | and R14 stores the return address. */ | |
11251 | record_buf[0] = ARM_PS_REGNUM; | |
11252 | record_buf[1] = ARM_LR_REGNUM; | |
11253 | arm_insn_r->reg_rec_count = 2; | |
11254 | } | |
11255 | } | |
11256 | else if (7 == arm_insn_r->decode && 0x12 == opcode1) | |
11257 | { | |
11258 | /* Handle enhanced software breakpoint insn, BKPT. */ | |
11259 | /* CPSR is changed to be executed in ARM state, disabling normal | |
11260 | interrupts, entering abort mode. */ | |
11261 | /* According to high vector configuration PC is set. */ | |
11262 | /* user hit breakpoint and type reverse, in | |
11263 | that case, we need to go back with previous CPSR and | |
11264 | Program Counter. */ | |
11265 | record_buf[0] = ARM_PS_REGNUM; | |
11266 | record_buf[1] = ARM_LR_REGNUM; | |
11267 | arm_insn_r->reg_rec_count = 2; | |
11268 | ||
11269 | /* Save SPSR also; how? */ | |
11270 | printf_unfiltered (_("Process record does not support instruction " | |
11271 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, | |
11272 | paddress (arm_insn_r->gdbarch, | |
11273 | arm_insn_r->this_addr)); | |
11274 | return -1; | |
11275 | } | |
11276 | else if (11 == arm_insn_r->decode | |
11277 | && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11278 | { | |
11279 | /* Handle enhanced store insns and DSP insns (e.g. LDRD). */ | |
11280 | ||
11281 | /* Handle str(x) insn */ | |
11282 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11283 | ARM_RECORD_STRH); | |
11284 | } | |
11285 | else if (1 == arm_insn_r->decode && 0x12 == opcode1 | |
11286 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) | |
11287 | { | |
11288 | /* Handle BX, branch and link/exchange. */ | |
11289 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */ | |
11290 | record_buf[0] = ARM_PS_REGNUM; | |
11291 | arm_insn_r->reg_rec_count = 1; | |
11292 | } | |
11293 | else if (1 == arm_insn_r->decode && 0x16 == opcode1 | |
11294 | && sbo_sbz (arm_insn_r->arm_insn, 9, 4, 1) | |
11295 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1)) | |
11296 | { | |
11297 | /* Count leading zeros: CLZ. */ | |
11298 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11299 | arm_insn_r->reg_rec_count = 1; | |
11300 | } | |
11301 | else if (!bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) | |
11302 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
11303 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1) | |
11304 | && sbo_sbz (arm_insn_r->arm_insn, 1, 12, 0) | |
11305 | ) | |
11306 | { | |
11307 | /* Handle MRS insn. */ | |
11308 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11309 | arm_insn_r->reg_rec_count = 1; | |
11310 | } | |
11311 | else if (arm_insn_r->opcode <= 15) | |
11312 | { | |
11313 | /* Normal data processing insns. */ | |
11314 | /* Out of 11 shifter operands mode, all the insn modifies destination | |
11315 | register, which is specified by 13-16 decode. */ | |
11316 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11317 | record_buf[1] = ARM_PS_REGNUM; | |
11318 | arm_insn_r->reg_rec_count = 2; | |
11319 | } | |
11320 | else | |
11321 | { | |
11322 | return -1; | |
11323 | } | |
11324 | ||
11325 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11326 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11327 | return 0; | |
11328 | } | |
11329 | ||
11330 | /* Handling opcode 001 insns. */ | |
11331 | ||
11332 | static int | |
11333 | arm_record_data_proc_imm (insn_decode_record *arm_insn_r) | |
11334 | { | |
11335 | uint32_t record_buf[8], record_buf_mem[8]; | |
11336 | ||
11337 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11338 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11339 | ||
11340 | if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) | |
11341 | && 2 == bits (arm_insn_r->arm_insn, 20, 21) | |
11342 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) | |
11343 | ) | |
11344 | { | |
11345 | /* Handle MSR insn. */ | |
11346 | if (9 == arm_insn_r->opcode) | |
11347 | { | |
11348 | /* CSPR is going to be changed. */ | |
11349 | record_buf[0] = ARM_PS_REGNUM; | |
11350 | arm_insn_r->reg_rec_count = 1; | |
11351 | } | |
11352 | else | |
11353 | { | |
11354 | /* SPSR is going to be changed. */ | |
11355 | } | |
11356 | } | |
11357 | else if (arm_insn_r->opcode <= 15) | |
11358 | { | |
11359 | /* Normal data processing insns. */ | |
11360 | /* Out of 11 shifter operands mode, all the insn modifies destination | |
11361 | register, which is specified by 13-16 decode. */ | |
11362 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11363 | record_buf[1] = ARM_PS_REGNUM; | |
11364 | arm_insn_r->reg_rec_count = 2; | |
11365 | } | |
11366 | else | |
11367 | { | |
11368 | return -1; | |
11369 | } | |
11370 | ||
11371 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11372 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11373 | return 0; | |
11374 | } | |
11375 | ||
11376 | /* Handling opcode 010 insns. */ | |
11377 | ||
11378 | static int | |
11379 | arm_record_ld_st_imm_offset (insn_decode_record *arm_insn_r) | |
11380 | { | |
11381 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11382 | ||
11383 | uint32_t reg_src1 = 0 , reg_dest = 0; | |
11384 | uint32_t offset_12 = 0, tgt_mem_addr = 0; | |
11385 | uint32_t record_buf[8], record_buf_mem[8]; | |
11386 | ||
11387 | ULONGEST u_regval = 0; | |
11388 | ||
11389 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11390 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11391 | ||
11392 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11393 | { | |
11394 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11395 | /* LDR insn has a capability to do branching, if | |
11396 | MOV LR, PC is precedded by LDR insn having Rn as R15 | |
11397 | in that case, it emulates branch and link insn, and hence we | |
11398 | need to save CSPR and PC as well. */ | |
11399 | if (ARM_PC_REGNUM != reg_dest) | |
11400 | { | |
11401 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11402 | arm_insn_r->reg_rec_count = 1; | |
11403 | } | |
11404 | else | |
11405 | { | |
11406 | record_buf[0] = reg_dest; | |
11407 | record_buf[1] = ARM_PS_REGNUM; | |
11408 | arm_insn_r->reg_rec_count = 2; | |
11409 | } | |
11410 | } | |
11411 | else | |
11412 | { | |
11413 | /* Store, immediate offset, immediate pre-indexed, | |
11414 | immediate post-indexed. */ | |
11415 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11416 | offset_12 = bits (arm_insn_r->arm_insn, 0, 11); | |
11417 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
11418 | /* U == 1 */ | |
11419 | if (bit (arm_insn_r->arm_insn, 23)) | |
11420 | { | |
11421 | tgt_mem_addr = u_regval + offset_12; | |
11422 | } | |
11423 | else | |
11424 | { | |
11425 | tgt_mem_addr = u_regval - offset_12; | |
11426 | } | |
11427 | ||
11428 | switch (arm_insn_r->opcode) | |
11429 | { | |
11430 | /* STR. */ | |
11431 | case 8: | |
11432 | case 12: | |
11433 | /* STR. */ | |
11434 | case 9: | |
11435 | case 13: | |
11436 | /* STRT. */ | |
11437 | case 1: | |
11438 | case 5: | |
11439 | /* STR. */ | |
11440 | case 4: | |
11441 | case 0: | |
11442 | record_buf_mem[0] = 4; | |
11443 | break; | |
11444 | ||
11445 | /* STRB. */ | |
11446 | case 10: | |
11447 | case 14: | |
11448 | /* STRB. */ | |
11449 | case 11: | |
11450 | case 15: | |
11451 | /* STRBT. */ | |
11452 | case 3: | |
11453 | case 7: | |
11454 | /* STRB. */ | |
11455 | case 2: | |
11456 | case 6: | |
11457 | record_buf_mem[0] = 1; | |
11458 | break; | |
11459 | ||
11460 | default: | |
11461 | gdb_assert_not_reached ("no decoding pattern found"); | |
11462 | break; | |
11463 | } | |
11464 | record_buf_mem[1] = tgt_mem_addr; | |
11465 | arm_insn_r->mem_rec_count = 1; | |
11466 | ||
11467 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11468 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11469 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11470 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11471 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11472 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11473 | ) | |
11474 | { | |
11475 | /* We are handling pre-indexed mode; post-indexed mode; | |
11476 | where Rn is going to be changed. */ | |
11477 | record_buf[0] = reg_src1; | |
11478 | arm_insn_r->reg_rec_count = 1; | |
11479 | } | |
11480 | } | |
11481 | ||
11482 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11483 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11484 | return 0; | |
11485 | } | |
11486 | ||
11487 | /* Handling opcode 011 insns. */ | |
11488 | ||
11489 | static int | |
11490 | arm_record_ld_st_reg_offset (insn_decode_record *arm_insn_r) | |
11491 | { | |
11492 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11493 | ||
11494 | uint32_t shift_imm = 0; | |
11495 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; | |
11496 | uint32_t offset_12 = 0, tgt_mem_addr = 0; | |
11497 | uint32_t record_buf[8], record_buf_mem[8]; | |
11498 | ||
11499 | LONGEST s_word; | |
11500 | ULONGEST u_regval[2]; | |
11501 | ||
11502 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11503 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11504 | ||
11505 | /* Handle enhanced store insns and LDRD DSP insn, | |
11506 | order begins according to addressing modes for store insns | |
11507 | STRH insn. */ | |
11508 | ||
11509 | /* LDR or STR? */ | |
11510 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11511 | { | |
11512 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11513 | /* LDR insn has a capability to do branching, if | |
11514 | MOV LR, PC is precedded by LDR insn having Rn as R15 | |
11515 | in that case, it emulates branch and link insn, and hence we | |
11516 | need to save CSPR and PC as well. */ | |
11517 | if (15 != reg_dest) | |
11518 | { | |
11519 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11520 | arm_insn_r->reg_rec_count = 1; | |
11521 | } | |
11522 | else | |
11523 | { | |
11524 | record_buf[0] = reg_dest; | |
11525 | record_buf[1] = ARM_PS_REGNUM; | |
11526 | arm_insn_r->reg_rec_count = 2; | |
11527 | } | |
11528 | } | |
11529 | else | |
11530 | { | |
11531 | if (! bits (arm_insn_r->arm_insn, 4, 11)) | |
11532 | { | |
11533 | /* Store insn, register offset and register pre-indexed, | |
11534 | register post-indexed. */ | |
11535 | /* Get Rm. */ | |
11536 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
11537 | /* Get Rn. */ | |
11538 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
11539 | regcache_raw_read_unsigned (reg_cache, reg_src1 | |
11540 | , &u_regval[0]); | |
11541 | regcache_raw_read_unsigned (reg_cache, reg_src2 | |
11542 | , &u_regval[1]); | |
11543 | if (15 == reg_src2) | |
11544 | { | |
11545 | /* If R15 was used as Rn, hence current PC+8. */ | |
11546 | /* Pre-indexed mode doesnt reach here ; illegal insn. */ | |
11547 | u_regval[0] = u_regval[0] + 8; | |
11548 | } | |
11549 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
11550 | /* U == 1. */ | |
11551 | if (bit (arm_insn_r->arm_insn, 23)) | |
11552 | { | |
11553 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
11554 | } | |
11555 | else | |
11556 | { | |
11557 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
11558 | } | |
11559 | ||
11560 | switch (arm_insn_r->opcode) | |
11561 | { | |
11562 | /* STR. */ | |
11563 | case 8: | |
11564 | case 12: | |
11565 | /* STR. */ | |
11566 | case 9: | |
11567 | case 13: | |
11568 | /* STRT. */ | |
11569 | case 1: | |
11570 | case 5: | |
11571 | /* STR. */ | |
11572 | case 0: | |
11573 | case 4: | |
11574 | record_buf_mem[0] = 4; | |
11575 | break; | |
11576 | ||
11577 | /* STRB. */ | |
11578 | case 10: | |
11579 | case 14: | |
11580 | /* STRB. */ | |
11581 | case 11: | |
11582 | case 15: | |
11583 | /* STRBT. */ | |
11584 | case 3: | |
11585 | case 7: | |
11586 | /* STRB. */ | |
11587 | case 2: | |
11588 | case 6: | |
11589 | record_buf_mem[0] = 1; | |
11590 | break; | |
11591 | ||
11592 | default: | |
11593 | gdb_assert_not_reached ("no decoding pattern found"); | |
11594 | break; | |
11595 | } | |
11596 | record_buf_mem[1] = tgt_mem_addr; | |
11597 | arm_insn_r->mem_rec_count = 1; | |
11598 | ||
11599 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11600 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11601 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11602 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11603 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11604 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11605 | ) | |
11606 | { | |
11607 | /* Rn is going to be changed in pre-indexed mode and | |
11608 | post-indexed mode as well. */ | |
11609 | record_buf[0] = reg_src2; | |
11610 | arm_insn_r->reg_rec_count = 1; | |
11611 | } | |
11612 | } | |
11613 | else | |
11614 | { | |
11615 | /* Store insn, scaled register offset; scaled pre-indexed. */ | |
11616 | offset_12 = bits (arm_insn_r->arm_insn, 5, 6); | |
11617 | /* Get Rm. */ | |
11618 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
11619 | /* Get Rn. */ | |
11620 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
11621 | /* Get shift_imm. */ | |
11622 | shift_imm = bits (arm_insn_r->arm_insn, 7, 11); | |
11623 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11624 | regcache_raw_read_signed (reg_cache, reg_src1, &s_word); | |
11625 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
11626 | /* Offset_12 used as shift. */ | |
11627 | switch (offset_12) | |
11628 | { | |
11629 | case 0: | |
11630 | /* Offset_12 used as index. */ | |
11631 | offset_12 = u_regval[0] << shift_imm; | |
11632 | break; | |
11633 | ||
11634 | case 1: | |
11635 | offset_12 = (!shift_imm)?0:u_regval[0] >> shift_imm; | |
11636 | break; | |
11637 | ||
11638 | case 2: | |
11639 | if (!shift_imm) | |
11640 | { | |
11641 | if (bit (u_regval[0], 31)) | |
11642 | { | |
11643 | offset_12 = 0xFFFFFFFF; | |
11644 | } | |
11645 | else | |
11646 | { | |
11647 | offset_12 = 0; | |
11648 | } | |
11649 | } | |
11650 | else | |
11651 | { | |
11652 | /* This is arithmetic shift. */ | |
11653 | offset_12 = s_word >> shift_imm; | |
11654 | } | |
11655 | break; | |
11656 | ||
11657 | case 3: | |
11658 | if (!shift_imm) | |
11659 | { | |
11660 | regcache_raw_read_unsigned (reg_cache, ARM_PS_REGNUM, | |
11661 | &u_regval[1]); | |
11662 | /* Get C flag value and shift it by 31. */ | |
11663 | offset_12 = (((bit (u_regval[1], 29)) << 31) \ | |
11664 | | (u_regval[0]) >> 1); | |
11665 | } | |
11666 | else | |
11667 | { | |
11668 | offset_12 = (u_regval[0] >> shift_imm) \ | |
11669 | | (u_regval[0] << | |
11670 | (sizeof(uint32_t) - shift_imm)); | |
11671 | } | |
11672 | break; | |
11673 | ||
11674 | default: | |
11675 | gdb_assert_not_reached ("no decoding pattern found"); | |
11676 | break; | |
11677 | } | |
11678 | ||
11679 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
11680 | /* bit U set. */ | |
11681 | if (bit (arm_insn_r->arm_insn, 23)) | |
11682 | { | |
11683 | tgt_mem_addr = u_regval[1] + offset_12; | |
11684 | } | |
11685 | else | |
11686 | { | |
11687 | tgt_mem_addr = u_regval[1] - offset_12; | |
11688 | } | |
11689 | ||
11690 | switch (arm_insn_r->opcode) | |
11691 | { | |
11692 | /* STR. */ | |
11693 | case 8: | |
11694 | case 12: | |
11695 | /* STR. */ | |
11696 | case 9: | |
11697 | case 13: | |
11698 | /* STRT. */ | |
11699 | case 1: | |
11700 | case 5: | |
11701 | /* STR. */ | |
11702 | case 0: | |
11703 | case 4: | |
11704 | record_buf_mem[0] = 4; | |
11705 | break; | |
11706 | ||
11707 | /* STRB. */ | |
11708 | case 10: | |
11709 | case 14: | |
11710 | /* STRB. */ | |
11711 | case 11: | |
11712 | case 15: | |
11713 | /* STRBT. */ | |
11714 | case 3: | |
11715 | case 7: | |
11716 | /* STRB. */ | |
11717 | case 2: | |
11718 | case 6: | |
11719 | record_buf_mem[0] = 1; | |
11720 | break; | |
11721 | ||
11722 | default: | |
11723 | gdb_assert_not_reached ("no decoding pattern found"); | |
11724 | break; | |
11725 | } | |
11726 | record_buf_mem[1] = tgt_mem_addr; | |
11727 | arm_insn_r->mem_rec_count = 1; | |
11728 | ||
11729 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11730 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11731 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11732 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11733 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11734 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11735 | ) | |
11736 | { | |
11737 | /* Rn is going to be changed in register scaled pre-indexed | |
11738 | mode,and scaled post indexed mode. */ | |
11739 | record_buf[0] = reg_src2; | |
11740 | arm_insn_r->reg_rec_count = 1; | |
11741 | } | |
11742 | } | |
11743 | } | |
11744 | ||
11745 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11746 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11747 | return 0; | |
11748 | } | |
11749 | ||
11750 | /* Handling opcode 100 insns. */ | |
11751 | ||
11752 | static int | |
11753 | arm_record_ld_st_multiple (insn_decode_record *arm_insn_r) | |
11754 | { | |
11755 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11756 | ||
11757 | uint32_t register_list[16] = {0}, register_count = 0, register_bits = 0; | |
11758 | uint32_t reg_src1 = 0, addr_mode = 0, no_of_regs = 0; | |
11759 | uint32_t start_address = 0, index = 0; | |
11760 | uint32_t record_buf[24], record_buf_mem[48]; | |
11761 | ||
11762 | ULONGEST u_regval[2] = {0}; | |
11763 | ||
11764 | /* This mode is exclusively for load and store multiple. */ | |
11765 | /* Handle incremenrt after/before and decrment after.before mode; | |
11766 | Rn is changing depending on W bit, but as of now we store Rn too | |
11767 | without optimization. */ | |
11768 | ||
11769 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11770 | { | |
11771 | /* LDM (1,2,3) where LDM (3) changes CPSR too. */ | |
11772 | ||
11773 | if (bit (arm_insn_r->arm_insn, 20) && !bit (arm_insn_r->arm_insn, 22)) | |
11774 | { | |
11775 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); | |
11776 | no_of_regs = 15; | |
11777 | } | |
11778 | else | |
11779 | { | |
11780 | register_bits = bits (arm_insn_r->arm_insn, 0, 14); | |
11781 | no_of_regs = 14; | |
11782 | } | |
11783 | /* Get Rn. */ | |
11784 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11785 | while (register_bits) | |
11786 | { | |
11787 | if (register_bits & 0x00000001) | |
11788 | register_list[register_count++] = 1; | |
11789 | register_bits = register_bits >> 1; | |
11790 | } | |
11791 | ||
11792 | /* Extra space for Base Register and CPSR; wihtout optimization. */ | |
11793 | record_buf[register_count] = reg_src1; | |
11794 | record_buf[register_count + 1] = ARM_PS_REGNUM; | |
11795 | arm_insn_r->reg_rec_count = register_count + 2; | |
11796 | ||
11797 | for (register_count = 0; register_count < no_of_regs; register_count++) | |
11798 | { | |
11799 | if (register_list[register_count]) | |
11800 | { | |
11801 | /* Register_count gives total no of registers | |
11802 | and dually working as reg number. */ | |
11803 | record_buf[index] = register_count; | |
11804 | index++; | |
11805 | } | |
11806 | } | |
11807 | ||
11808 | } | |
11809 | else | |
11810 | { | |
11811 | /* It handles both STM(1) and STM(2). */ | |
11812 | addr_mode = bits (arm_insn_r->arm_insn, 23, 24); | |
11813 | ||
11814 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); | |
11815 | /* Get Rn. */ | |
11816 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11817 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11818 | while (register_bits) | |
11819 | { | |
11820 | if (register_bits & 0x00000001) | |
11821 | register_count++; | |
11822 | register_bits = register_bits >> 1; | |
11823 | } | |
11824 | ||
11825 | switch (addr_mode) | |
11826 | { | |
11827 | /* Decrement after. */ | |
11828 | case 0: | |
11829 | start_address = (u_regval[0]) - (register_count * 4) + 4; | |
11830 | arm_insn_r->mem_rec_count = register_count; | |
11831 | while (register_count) | |
11832 | { | |
11833 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11834 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11835 | start_address = start_address + 4; | |
11836 | register_count--; | |
11837 | } | |
11838 | break; | |
11839 | ||
11840 | /* Increment after. */ | |
11841 | case 1: | |
11842 | start_address = u_regval[0]; | |
11843 | arm_insn_r->mem_rec_count = register_count; | |
11844 | while (register_count) | |
11845 | { | |
11846 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11847 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11848 | start_address = start_address + 4; | |
11849 | register_count--; | |
11850 | } | |
11851 | break; | |
11852 | ||
11853 | /* Decrement before. */ | |
11854 | case 2: | |
11855 | ||
11856 | start_address = (u_regval[0]) - (register_count * 4); | |
11857 | arm_insn_r->mem_rec_count = register_count; | |
11858 | while (register_count) | |
11859 | { | |
11860 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11861 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11862 | start_address = start_address + 4; | |
11863 | register_count--; | |
11864 | } | |
11865 | break; | |
11866 | ||
11867 | /* Increment before. */ | |
11868 | case 3: | |
11869 | start_address = u_regval[0] + 4; | |
11870 | arm_insn_r->mem_rec_count = register_count; | |
11871 | while (register_count) | |
11872 | { | |
11873 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11874 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11875 | start_address = start_address + 4; | |
11876 | register_count--; | |
11877 | } | |
11878 | break; | |
11879 | ||
11880 | default: | |
11881 | gdb_assert_not_reached ("no decoding pattern found"); | |
11882 | break; | |
11883 | } | |
11884 | ||
11885 | /* Base register also changes; based on condition and W bit. */ | |
11886 | /* We save it anyway without optimization. */ | |
11887 | record_buf[0] = reg_src1; | |
11888 | arm_insn_r->reg_rec_count = 1; | |
11889 | } | |
11890 | ||
11891 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11892 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11893 | return 0; | |
11894 | } | |
11895 | ||
11896 | /* Handling opcode 101 insns. */ | |
11897 | ||
11898 | static int | |
11899 | arm_record_b_bl (insn_decode_record *arm_insn_r) | |
11900 | { | |
11901 | uint32_t record_buf[8]; | |
11902 | ||
11903 | /* Handle B, BL, BLX(1) insns. */ | |
11904 | /* B simply branches so we do nothing here. */ | |
11905 | /* Note: BLX(1) doesnt fall here but instead it falls into | |
11906 | extension space. */ | |
11907 | if (bit (arm_insn_r->arm_insn, 24)) | |
11908 | { | |
11909 | record_buf[0] = ARM_LR_REGNUM; | |
11910 | arm_insn_r->reg_rec_count = 1; | |
11911 | } | |
11912 | ||
11913 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11914 | ||
11915 | return 0; | |
11916 | } | |
11917 | ||
11918 | /* Handling opcode 110 insns. */ | |
11919 | ||
11920 | static int | |
11921 | arm_record_coproc (insn_decode_record *arm_insn_r) | |
11922 | { | |
11923 | printf_unfiltered (_("Process record does not support instruction " | |
11924 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, | |
11925 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11926 | ||
11927 | return -1; | |
11928 | } | |
11929 | ||
11930 | /* Handling opcode 111 insns. */ | |
11931 | ||
11932 | static int | |
11933 | arm_record_coproc_data_proc (insn_decode_record *arm_insn_r) | |
11934 | { | |
11935 | struct gdbarch_tdep *tdep = gdbarch_tdep (arm_insn_r->gdbarch); | |
11936 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11937 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ | |
11938 | ||
11939 | /* Handle SWI insn; system call would be handled over here. */ | |
11940 | ||
11941 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 24, 27); | |
11942 | if (15 == arm_insn_r->opcode) | |
11943 | { | |
11944 | /* Handle arm syscall insn. */ | |
11945 | if (tdep->arm_swi_record != NULL) | |
11946 | { | |
11947 | ret = tdep->arm_swi_record(reg_cache); | |
11948 | } | |
11949 | else | |
11950 | { | |
11951 | printf_unfiltered (_("no syscall record support\n")); | |
11952 | ret = -1; | |
11953 | } | |
11954 | } | |
11955 | ||
11956 | printf_unfiltered (_("Process record does not support instruction " | |
11957 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, | |
11958 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11959 | return ret; | |
11960 | } | |
11961 | ||
11962 | /* Handling opcode 000 insns. */ | |
11963 | ||
11964 | static int | |
11965 | thumb_record_shift_add_sub (insn_decode_record *thumb_insn_r) | |
11966 | { | |
11967 | uint32_t record_buf[8]; | |
11968 | uint32_t reg_src1 = 0; | |
11969 | ||
11970 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
11971 | ||
11972 | record_buf[0] = ARM_PS_REGNUM; | |
11973 | record_buf[1] = reg_src1; | |
11974 | thumb_insn_r->reg_rec_count = 2; | |
11975 | ||
11976 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
11977 | ||
11978 | return 0; | |
11979 | } | |
11980 | ||
11981 | ||
11982 | /* Handling opcode 001 insns. */ | |
11983 | ||
11984 | static int | |
11985 | thumb_record_add_sub_cmp_mov (insn_decode_record *thumb_insn_r) | |
11986 | { | |
11987 | uint32_t record_buf[8]; | |
11988 | uint32_t reg_src1 = 0; | |
11989 | ||
11990 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
11991 | ||
11992 | record_buf[0] = ARM_PS_REGNUM; | |
11993 | record_buf[1] = reg_src1; | |
11994 | thumb_insn_r->reg_rec_count = 2; | |
11995 | ||
11996 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
11997 | ||
11998 | return 0; | |
11999 | } | |
12000 | ||
12001 | /* Handling opcode 010 insns. */ | |
12002 | ||
12003 | static int | |
12004 | thumb_record_ld_st_reg_offset (insn_decode_record *thumb_insn_r) | |
12005 | { | |
12006 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12007 | uint32_t record_buf[8], record_buf_mem[8]; | |
12008 | ||
12009 | uint32_t reg_src1 = 0, reg_src2 = 0; | |
12010 | uint32_t opcode1 = 0, opcode2 = 0, opcode3 = 0; | |
12011 | ||
12012 | ULONGEST u_regval[2] = {0}; | |
12013 | ||
12014 | opcode1 = bits (thumb_insn_r->arm_insn, 10, 12); | |
12015 | ||
12016 | if (bit (thumb_insn_r->arm_insn, 12)) | |
12017 | { | |
12018 | /* Handle load/store register offset. */ | |
12019 | opcode2 = bits (thumb_insn_r->arm_insn, 9, 10); | |
12020 | if (opcode2 >= 12 && opcode2 <= 15) | |
12021 | { | |
12022 | /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */ | |
12023 | reg_src1 = bits (thumb_insn_r->arm_insn,0, 2); | |
12024 | record_buf[0] = reg_src1; | |
12025 | thumb_insn_r->reg_rec_count = 1; | |
12026 | } | |
12027 | else if (opcode2 >= 8 && opcode2 <= 10) | |
12028 | { | |
12029 | /* STR(2), STRB(2), STRH(2) . */ | |
12030 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12031 | reg_src2 = bits (thumb_insn_r->arm_insn, 6, 8); | |
12032 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
12033 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
12034 | if (8 == opcode2) | |
12035 | record_buf_mem[0] = 4; /* STR (2). */ | |
12036 | else if (10 == opcode2) | |
12037 | record_buf_mem[0] = 1; /* STRB (2). */ | |
12038 | else if (9 == opcode2) | |
12039 | record_buf_mem[0] = 2; /* STRH (2). */ | |
12040 | record_buf_mem[1] = u_regval[0] + u_regval[1]; | |
12041 | thumb_insn_r->mem_rec_count = 1; | |
12042 | } | |
12043 | } | |
12044 | else if (bit (thumb_insn_r->arm_insn, 11)) | |
12045 | { | |
12046 | /* Handle load from literal pool. */ | |
12047 | /* LDR(3). */ | |
12048 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12049 | record_buf[0] = reg_src1; | |
12050 | thumb_insn_r->reg_rec_count = 1; | |
12051 | } | |
12052 | else if (opcode1) | |
12053 | { | |
12054 | opcode2 = bits (thumb_insn_r->arm_insn, 8, 9); | |
12055 | opcode3 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12056 | if ((3 == opcode2) && (!opcode3)) | |
12057 | { | |
12058 | /* Branch with exchange. */ | |
12059 | record_buf[0] = ARM_PS_REGNUM; | |
12060 | thumb_insn_r->reg_rec_count = 1; | |
12061 | } | |
12062 | else | |
12063 | { | |
12064 | /* Format 8; special data processing insns. */ | |
12065 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12066 | record_buf[0] = ARM_PS_REGNUM; | |
12067 | record_buf[1] = reg_src1; | |
12068 | thumb_insn_r->reg_rec_count = 2; | |
12069 | } | |
12070 | } | |
12071 | else | |
12072 | { | |
12073 | /* Format 5; data processing insns. */ | |
12074 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12075 | if (bit (thumb_insn_r->arm_insn, 7)) | |
12076 | { | |
12077 | reg_src1 = reg_src1 + 8; | |
12078 | } | |
12079 | record_buf[0] = ARM_PS_REGNUM; | |
12080 | record_buf[1] = reg_src1; | |
12081 | thumb_insn_r->reg_rec_count = 2; | |
12082 | } | |
12083 | ||
12084 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12085 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12086 | record_buf_mem); | |
12087 | ||
12088 | return 0; | |
12089 | } | |
12090 | ||
12091 | /* Handling opcode 001 insns. */ | |
12092 | ||
12093 | static int | |
12094 | thumb_record_ld_st_imm_offset (insn_decode_record *thumb_insn_r) | |
12095 | { | |
12096 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12097 | uint32_t record_buf[8], record_buf_mem[8]; | |
12098 | ||
12099 | uint32_t reg_src1 = 0; | |
12100 | uint32_t opcode = 0, immed_5 = 0; | |
12101 | ||
12102 | ULONGEST u_regval = 0; | |
12103 | ||
12104 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12105 | ||
12106 | if (opcode) | |
12107 | { | |
12108 | /* LDR(1). */ | |
12109 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12110 | record_buf[0] = reg_src1; | |
12111 | thumb_insn_r->reg_rec_count = 1; | |
12112 | } | |
12113 | else | |
12114 | { | |
12115 | /* STR(1). */ | |
12116 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12117 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); | |
12118 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12119 | record_buf_mem[0] = 4; | |
12120 | record_buf_mem[1] = u_regval + (immed_5 * 4); | |
12121 | thumb_insn_r->mem_rec_count = 1; | |
12122 | } | |
12123 | ||
12124 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12125 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12126 | record_buf_mem); | |
12127 | ||
12128 | return 0; | |
12129 | } | |
12130 | ||
12131 | /* Handling opcode 100 insns. */ | |
12132 | ||
12133 | static int | |
12134 | thumb_record_ld_st_stack (insn_decode_record *thumb_insn_r) | |
12135 | { | |
12136 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12137 | uint32_t record_buf[8], record_buf_mem[8]; | |
12138 | ||
12139 | uint32_t reg_src1 = 0; | |
12140 | uint32_t opcode = 0, immed_8 = 0, immed_5 = 0; | |
12141 | ||
12142 | ULONGEST u_regval = 0; | |
12143 | ||
12144 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12145 | ||
12146 | if (3 == opcode) | |
12147 | { | |
12148 | /* LDR(4). */ | |
12149 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12150 | record_buf[0] = reg_src1; | |
12151 | thumb_insn_r->reg_rec_count = 1; | |
12152 | } | |
12153 | else if (1 == opcode) | |
12154 | { | |
12155 | /* LDRH(1). */ | |
12156 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12157 | record_buf[0] = reg_src1; | |
12158 | thumb_insn_r->reg_rec_count = 1; | |
12159 | } | |
12160 | else if (2 == opcode) | |
12161 | { | |
12162 | /* STR(3). */ | |
12163 | immed_8 = bits (thumb_insn_r->arm_insn, 0, 7); | |
12164 | regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval); | |
12165 | record_buf_mem[0] = 4; | |
12166 | record_buf_mem[1] = u_regval + (immed_8 * 4); | |
12167 | thumb_insn_r->mem_rec_count = 1; | |
12168 | } | |
12169 | else if (0 == opcode) | |
12170 | { | |
12171 | /* STRH(1). */ | |
12172 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); | |
12173 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12174 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12175 | record_buf_mem[0] = 2; | |
12176 | record_buf_mem[1] = u_regval + (immed_5 * 2); | |
12177 | thumb_insn_r->mem_rec_count = 1; | |
12178 | } | |
12179 | ||
12180 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12181 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12182 | record_buf_mem); | |
12183 | ||
12184 | return 0; | |
12185 | } | |
12186 | ||
12187 | /* Handling opcode 101 insns. */ | |
12188 | ||
12189 | static int | |
12190 | thumb_record_misc (insn_decode_record *thumb_insn_r) | |
12191 | { | |
12192 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12193 | ||
12194 | uint32_t opcode = 0, opcode1 = 0, opcode2 = 0; | |
12195 | uint32_t register_bits = 0, register_count = 0; | |
12196 | uint32_t register_list[8] = {0}, index = 0, start_address = 0; | |
12197 | uint32_t record_buf[24], record_buf_mem[48]; | |
12198 | uint32_t reg_src1; | |
12199 | ||
12200 | ULONGEST u_regval = 0; | |
12201 | ||
12202 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12203 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); | |
12204 | opcode2 = bits (thumb_insn_r->arm_insn, 9, 12); | |
12205 | ||
12206 | if (14 == opcode2) | |
12207 | { | |
12208 | /* POP. */ | |
12209 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12210 | while (register_bits) | |
12211 | { | |
12212 | if (register_bits & 0x00000001) | |
12213 | register_list[register_count++] = 1; | |
12214 | register_bits = register_bits >> 1; | |
12215 | } | |
12216 | record_buf[register_count] = ARM_PS_REGNUM; | |
12217 | record_buf[register_count + 1] = ARM_SP_REGNUM; | |
12218 | thumb_insn_r->reg_rec_count = register_count + 2; | |
12219 | for (register_count = 0; register_count < 8; register_count++) | |
12220 | { | |
12221 | if (register_list[register_count]) | |
12222 | { | |
12223 | record_buf[index] = register_count; | |
12224 | index++; | |
12225 | } | |
12226 | } | |
12227 | } | |
12228 | else if (10 == opcode2) | |
12229 | { | |
12230 | /* PUSH. */ | |
12231 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12232 | regcache_raw_read_unsigned (reg_cache, ARM_PC_REGNUM, &u_regval); | |
12233 | while (register_bits) | |
12234 | { | |
12235 | if (register_bits & 0x00000001) | |
12236 | register_count++; | |
12237 | register_bits = register_bits >> 1; | |
12238 | } | |
12239 | start_address = u_regval - \ | |
12240 | (4 * (bit (thumb_insn_r->arm_insn, 8) + register_count)); | |
12241 | thumb_insn_r->mem_rec_count = register_count; | |
12242 | while (register_count) | |
12243 | { | |
12244 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
12245 | record_buf_mem[(register_count * 2) - 2] = 4; | |
12246 | start_address = start_address + 4; | |
12247 | register_count--; | |
12248 | } | |
12249 | record_buf[0] = ARM_SP_REGNUM; | |
12250 | thumb_insn_r->reg_rec_count = 1; | |
12251 | } | |
12252 | else if (0x1E == opcode1) | |
12253 | { | |
12254 | /* BKPT insn. */ | |
12255 | /* Handle enhanced software breakpoint insn, BKPT. */ | |
12256 | /* CPSR is changed to be executed in ARM state, disabling normal | |
12257 | interrupts, entering abort mode. */ | |
12258 | /* According to high vector configuration PC is set. */ | |
12259 | /* User hits breakpoint and type reverse, in that case, we need to go back with | |
12260 | previous CPSR and Program Counter. */ | |
12261 | record_buf[0] = ARM_PS_REGNUM; | |
12262 | record_buf[1] = ARM_LR_REGNUM; | |
12263 | thumb_insn_r->reg_rec_count = 2; | |
12264 | /* We need to save SPSR value, which is not yet done. */ | |
12265 | printf_unfiltered (_("Process record does not support instruction " | |
12266 | "0x%0x at address %s.\n"), | |
12267 | thumb_insn_r->arm_insn, | |
12268 | paddress (thumb_insn_r->gdbarch, | |
12269 | thumb_insn_r->this_addr)); | |
12270 | return -1; | |
12271 | } | |
12272 | else if ((0 == opcode) || (1 == opcode)) | |
12273 | { | |
12274 | /* ADD(5), ADD(6). */ | |
12275 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12276 | record_buf[0] = reg_src1; | |
12277 | thumb_insn_r->reg_rec_count = 1; | |
12278 | } | |
12279 | else if (2 == opcode) | |
12280 | { | |
12281 | /* ADD(7), SUB(4). */ | |
12282 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12283 | record_buf[0] = ARM_SP_REGNUM; | |
12284 | thumb_insn_r->reg_rec_count = 1; | |
12285 | } | |
12286 | ||
12287 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12288 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12289 | record_buf_mem); | |
12290 | ||
12291 | return 0; | |
12292 | } | |
12293 | ||
12294 | /* Handling opcode 110 insns. */ | |
12295 | ||
12296 | static int | |
12297 | thumb_record_ldm_stm_swi (insn_decode_record *thumb_insn_r) | |
12298 | { | |
12299 | struct gdbarch_tdep *tdep = gdbarch_tdep (thumb_insn_r->gdbarch); | |
12300 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12301 | ||
12302 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ | |
12303 | uint32_t reg_src1 = 0; | |
12304 | uint32_t opcode1 = 0, opcode2 = 0, register_bits = 0, register_count = 0; | |
12305 | uint32_t register_list[8] = {0}, index = 0, start_address = 0; | |
12306 | uint32_t record_buf[24], record_buf_mem[48]; | |
12307 | ||
12308 | ULONGEST u_regval = 0; | |
12309 | ||
12310 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); | |
12311 | opcode2 = bits (thumb_insn_r->arm_insn, 11, 12); | |
12312 | ||
12313 | if (1 == opcode2) | |
12314 | { | |
12315 | ||
12316 | /* LDMIA. */ | |
12317 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12318 | /* Get Rn. */ | |
12319 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12320 | while (register_bits) | |
12321 | { | |
12322 | if (register_bits & 0x00000001) | |
12323 | register_list[register_count++] = 1; | |
12324 | register_bits = register_bits >> 1; | |
12325 | } | |
12326 | record_buf[register_count] = reg_src1; | |
12327 | thumb_insn_r->reg_rec_count = register_count + 1; | |
12328 | for (register_count = 0; register_count < 8; register_count++) | |
12329 | { | |
12330 | if (register_list[register_count]) | |
12331 | { | |
12332 | record_buf[index] = register_count; | |
12333 | index++; | |
12334 | } | |
12335 | } | |
12336 | } | |
12337 | else if (0 == opcode2) | |
12338 | { | |
12339 | /* It handles both STMIA. */ | |
12340 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12341 | /* Get Rn. */ | |
12342 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12343 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12344 | while (register_bits) | |
12345 | { | |
12346 | if (register_bits & 0x00000001) | |
12347 | register_count++; | |
12348 | register_bits = register_bits >> 1; | |
12349 | } | |
12350 | start_address = u_regval; | |
12351 | thumb_insn_r->mem_rec_count = register_count; | |
12352 | while (register_count) | |
12353 | { | |
12354 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
12355 | record_buf_mem[(register_count * 2) - 2] = 4; | |
12356 | start_address = start_address + 4; | |
12357 | register_count--; | |
12358 | } | |
12359 | } | |
12360 | else if (0x1F == opcode1) | |
12361 | { | |
12362 | /* Handle arm syscall insn. */ | |
12363 | if (tdep->arm_swi_record != NULL) | |
12364 | { | |
12365 | ret = tdep->arm_swi_record(reg_cache); | |
12366 | } | |
12367 | else | |
12368 | { | |
12369 | printf_unfiltered (_("no syscall record support\n")); | |
12370 | return -1; | |
12371 | } | |
12372 | } | |
12373 | ||
12374 | /* B (1), conditional branch is automatically taken care in process_record, | |
12375 | as PC is saved there. */ | |
12376 | ||
12377 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12378 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12379 | record_buf_mem); | |
12380 | ||
12381 | return ret; | |
12382 | } | |
12383 | ||
12384 | /* Handling opcode 111 insns. */ | |
12385 | ||
12386 | static int | |
12387 | thumb_record_branch (insn_decode_record *thumb_insn_r) | |
12388 | { | |
12389 | uint32_t record_buf[8]; | |
12390 | uint32_t bits_h = 0; | |
12391 | ||
12392 | bits_h = bits (thumb_insn_r->arm_insn, 11, 12); | |
12393 | ||
12394 | if (2 == bits_h || 3 == bits_h) | |
12395 | { | |
12396 | /* BL */ | |
12397 | record_buf[0] = ARM_LR_REGNUM; | |
12398 | thumb_insn_r->reg_rec_count = 1; | |
12399 | } | |
12400 | else if (1 == bits_h) | |
12401 | { | |
12402 | /* BLX(1). */ | |
12403 | record_buf[0] = ARM_PS_REGNUM; | |
12404 | record_buf[1] = ARM_LR_REGNUM; | |
12405 | thumb_insn_r->reg_rec_count = 2; | |
12406 | } | |
12407 | ||
12408 | /* B(2) is automatically taken care in process_record, as PC is | |
12409 | saved there. */ | |
12410 | ||
12411 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12412 | ||
12413 | return 0; | |
12414 | } | |
12415 | ||
12416 | ||
12417 | /* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success | |
12418 | and positive val on fauilure. */ | |
12419 | ||
12420 | static int | |
12421 | extract_arm_insn (insn_decode_record *insn_record, uint32_t insn_size) | |
12422 | { | |
12423 | gdb_byte buf[insn_size]; | |
12424 | ||
12425 | memset (&buf[0], 0, insn_size); | |
12426 | ||
12427 | if (target_read_memory (insn_record->this_addr, &buf[0], insn_size)) | |
12428 | return 1; | |
12429 | insn_record->arm_insn = (uint32_t) extract_unsigned_integer (&buf[0], | |
12430 | insn_size, | |
12431 | gdbarch_byte_order (insn_record->gdbarch)); | |
12432 | return 0; | |
12433 | } | |
12434 | ||
12435 | typedef int (*sti_arm_hdl_fp_t) (insn_decode_record*); | |
12436 | ||
12437 | /* Decode arm/thumb insn depending on condition cods and opcodes; and | |
12438 | dispatch it. */ | |
12439 | ||
12440 | static int | |
12441 | decode_insn (insn_decode_record *arm_record, record_type_t record_type, | |
12442 | uint32_t insn_size) | |
12443 | { | |
12444 | ||
12445 | /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm instruction. */ | |
12446 | static const sti_arm_hdl_fp_t const arm_handle_insn[8] = | |
12447 | { | |
12448 | arm_record_data_proc_misc_ld_str, /* 000. */ | |
12449 | arm_record_data_proc_imm, /* 001. */ | |
12450 | arm_record_ld_st_imm_offset, /* 010. */ | |
12451 | arm_record_ld_st_reg_offset, /* 011. */ | |
12452 | arm_record_ld_st_multiple, /* 100. */ | |
12453 | arm_record_b_bl, /* 101. */ | |
12454 | arm_record_coproc, /* 110. */ | |
12455 | arm_record_coproc_data_proc /* 111. */ | |
12456 | }; | |
12457 | ||
12458 | /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb instruction. */ | |
12459 | static const sti_arm_hdl_fp_t const thumb_handle_insn[8] = | |
12460 | { \ | |
12461 | thumb_record_shift_add_sub, /* 000. */ | |
12462 | thumb_record_add_sub_cmp_mov, /* 001. */ | |
12463 | thumb_record_ld_st_reg_offset, /* 010. */ | |
12464 | thumb_record_ld_st_imm_offset, /* 011. */ | |
12465 | thumb_record_ld_st_stack, /* 100. */ | |
12466 | thumb_record_misc, /* 101. */ | |
12467 | thumb_record_ldm_stm_swi, /* 110. */ | |
12468 | thumb_record_branch /* 111. */ | |
12469 | }; | |
12470 | ||
12471 | uint32_t ret = 0; /* return value: negative:failure 0:success. */ | |
12472 | uint32_t insn_id = 0; | |
12473 | ||
12474 | if (extract_arm_insn (arm_record, insn_size)) | |
12475 | { | |
12476 | if (record_debug) | |
12477 | { | |
12478 | printf_unfiltered (_("Process record: error reading memory at " | |
12479 | "addr %s len = %d.\n"), | |
12480 | paddress (arm_record->gdbarch, arm_record->this_addr), insn_size); | |
12481 | } | |
12482 | return -1; | |
12483 | } | |
12484 | else if (ARM_RECORD == record_type) | |
12485 | { | |
12486 | arm_record->cond = bits (arm_record->arm_insn, 28, 31); | |
12487 | insn_id = bits (arm_record->arm_insn, 25, 27); | |
12488 | ret = arm_record_extension_space (arm_record); | |
12489 | /* If this insn has fallen into extension space | |
12490 | then we need not decode it anymore. */ | |
12491 | if (ret != -1 && !INSN_RECORDED(arm_record)) | |
12492 | { | |
12493 | ret = arm_handle_insn[insn_id] (arm_record); | |
12494 | } | |
12495 | } | |
12496 | else if (THUMB_RECORD == record_type) | |
12497 | { | |
12498 | /* As thumb does not have condition codes, we set negative. */ | |
12499 | arm_record->cond = -1; | |
12500 | insn_id = bits (arm_record->arm_insn, 13, 15); | |
12501 | ret = thumb_handle_insn[insn_id] (arm_record); | |
12502 | } | |
12503 | else if (THUMB2_RECORD == record_type) | |
12504 | { | |
12505 | printf_unfiltered (_("Process record doesnt support thumb32 instruction " | |
12506 | "0x%0x at address %s.\n"),arm_record->arm_insn, | |
12507 | paddress (arm_record->gdbarch, | |
12508 | arm_record->this_addr)); | |
12509 | ret = -1; | |
12510 | } | |
12511 | else | |
12512 | { | |
12513 | /* Throw assertion. */ | |
12514 | gdb_assert_not_reached ("not a valid instruction, could not decode"); | |
12515 | } | |
12516 | ||
12517 | return ret; | |
12518 | } | |
12519 | ||
12520 | ||
12521 | /* Cleans up local record registers and memory allocations. */ | |
12522 | ||
12523 | static void | |
12524 | deallocate_reg_mem (insn_decode_record *record) | |
12525 | { | |
12526 | xfree (record->arm_regs); | |
12527 | xfree (record->arm_mems); | |
12528 | } | |
12529 | ||
12530 | ||
12531 | /* Parse the current instruction and record the values of the registers and | |
12532 | memory that will be changed in current instruction to record_arch_list". | |
12533 | Return -1 if something is wrong. */ | |
12534 | ||
12535 | int | |
12536 | arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache, | |
12537 | CORE_ADDR insn_addr) | |
12538 | { | |
12539 | ||
12540 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
12541 | uint32_t no_of_rec = 0; | |
12542 | uint32_t ret = 0; /* return value: -1:record failure ; 0:success */ | |
12543 | ULONGEST t_bit = 0, insn_id = 0; | |
12544 | ||
12545 | ULONGEST u_regval = 0; | |
12546 | ||
12547 | insn_decode_record arm_record; | |
12548 | ||
12549 | memset (&arm_record, 0, sizeof (insn_decode_record)); | |
12550 | arm_record.regcache = regcache; | |
12551 | arm_record.this_addr = insn_addr; | |
12552 | arm_record.gdbarch = gdbarch; | |
12553 | ||
12554 | ||
12555 | if (record_debug > 1) | |
12556 | { | |
12557 | fprintf_unfiltered (gdb_stdlog, "Process record: arm_process_record " | |
12558 | "addr = %s\n", | |
12559 | paddress (gdbarch, arm_record.this_addr)); | |
12560 | } | |
12561 | ||
12562 | if (extract_arm_insn (&arm_record, 2)) | |
12563 | { | |
12564 | if (record_debug) | |
12565 | { | |
12566 | printf_unfiltered (_("Process record: error reading memory at " | |
12567 | "addr %s len = %d.\n"), | |
12568 | paddress (arm_record.gdbarch, | |
12569 | arm_record.this_addr), 2); | |
12570 | } | |
12571 | return -1; | |
12572 | } | |
12573 | ||
12574 | /* Check the insn, whether it is thumb or arm one. */ | |
12575 | ||
12576 | t_bit = arm_psr_thumb_bit (arm_record.gdbarch); | |
12577 | regcache_raw_read_unsigned (arm_record.regcache, ARM_PS_REGNUM, &u_regval); | |
12578 | ||
12579 | ||
12580 | if (!(u_regval & t_bit)) | |
12581 | { | |
12582 | /* We are decoding arm insn. */ | |
12583 | ret = decode_insn (&arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES); | |
12584 | } | |
12585 | else | |
12586 | { | |
12587 | insn_id = bits (arm_record.arm_insn, 11, 15); | |
12588 | /* is it thumb2 insn? */ | |
12589 | if ((0x1D == insn_id) || (0x1E == insn_id) || (0x1F == insn_id)) | |
12590 | { | |
12591 | ret = decode_insn (&arm_record, THUMB2_RECORD, | |
12592 | THUMB2_INSN_SIZE_BYTES); | |
12593 | } | |
12594 | else | |
12595 | { | |
12596 | /* We are decoding thumb insn. */ | |
12597 | ret = decode_insn (&arm_record, THUMB_RECORD, THUMB_INSN_SIZE_BYTES); | |
12598 | } | |
12599 | } | |
12600 | ||
12601 | if (0 == ret) | |
12602 | { | |
12603 | /* Record registers. */ | |
12604 | record_arch_list_add_reg (arm_record.regcache, ARM_PC_REGNUM); | |
12605 | if (arm_record.arm_regs) | |
12606 | { | |
12607 | for (no_of_rec = 0; no_of_rec < arm_record.reg_rec_count; no_of_rec++) | |
12608 | { | |
12609 | if (record_arch_list_add_reg (arm_record.regcache , | |
12610 | arm_record.arm_regs[no_of_rec])) | |
12611 | ret = -1; | |
12612 | } | |
12613 | } | |
12614 | /* Record memories. */ | |
12615 | if (arm_record.arm_mems) | |
12616 | { | |
12617 | for (no_of_rec = 0; no_of_rec < arm_record.mem_rec_count; no_of_rec++) | |
12618 | { | |
12619 | if (record_arch_list_add_mem | |
12620 | ((CORE_ADDR)arm_record.arm_mems[no_of_rec].addr, | |
12621 | arm_record.arm_mems[no_of_rec].len)) | |
12622 | ret = -1; | |
12623 | } | |
12624 | } | |
12625 | ||
12626 | if (record_arch_list_add_end ()) | |
12627 | ret = -1; | |
12628 | } | |
12629 | ||
12630 | ||
12631 | deallocate_reg_mem (&arm_record); | |
12632 | ||
12633 | return ret; | |
12634 | } | |
12635 |