Commit | Line | Data |
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85102364 | 1 | /* Target dependent code for ARC architecture, for GDB. |
ad0a504f | 2 | |
3666a048 | 3 | Copyright 2005-2021 Free Software Foundation, Inc. |
ad0a504f AK |
4 | Contributed by Synopsys Inc. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
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 | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
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. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | /* GDB header files. */ | |
22 | #include "defs.h" | |
23 | #include "arch-utils.h" | |
995d3a19 | 24 | #include "elf-bfd.h" |
ad0a504f | 25 | #include "disasm.h" |
82ca8957 | 26 | #include "dwarf2/frame.h" |
ad0a504f AK |
27 | #include "frame-base.h" |
28 | #include "frame-unwind.h" | |
d55e5aa6 | 29 | #include "gdbcore.h" |
4de283e4 | 30 | #include "gdbcmd.h" |
ad0a504f | 31 | #include "objfiles.h" |
817a7585 | 32 | #include "osabi.h" |
fe5f7374 | 33 | #include "prologue-value.h" |
817a7585 | 34 | #include "target-descriptions.h" |
ad0a504f AK |
35 | #include "trad-frame.h" |
36 | ||
37 | /* ARC header files. */ | |
38 | #include "opcode/arc.h" | |
f16f7b7c | 39 | #include "opcodes/arc-dis.h" |
ad0a504f | 40 | #include "arc-tdep.h" |
817a7585 | 41 | #include "arch/arc.h" |
ad0a504f AK |
42 | |
43 | /* Standard headers. */ | |
44 | #include <algorithm> | |
995d3a19 | 45 | #include <sstream> |
ad0a504f | 46 | |
fe5f7374 | 47 | /* The frame unwind cache for ARC. */ |
ad0a504f AK |
48 | |
49 | struct arc_frame_cache | |
50 | { | |
51 | /* The stack pointer at the time this frame was created; i.e. the caller's | |
52 | stack pointer when this function was called. It is used to identify this | |
53 | frame. */ | |
54 | CORE_ADDR prev_sp; | |
55 | ||
fe5f7374 AK |
56 | /* Register that is a base for this frame - FP for normal frame, SP for |
57 | non-FP frames. */ | |
58 | int frame_base_reg; | |
59 | ||
60 | /* Offset from the previous SP to the current frame base. If GCC uses | |
61 | `SUB SP,SP,offset` to allocate space for local variables, then it will be | |
62 | done after setting up a frame pointer, but it still will be considered | |
63 | part of prologue, therefore SP will be lesser than FP at the end of the | |
64 | prologue analysis. In this case that would be an offset from old SP to a | |
65 | new FP. But in case of non-FP frames, frame base is an SP and thus that | |
66 | would be an offset from old SP to new SP. What is important is that this | |
67 | is an offset from old SP to a known register, so it can be used to find | |
68 | old SP. | |
69 | ||
70 | Using FP is preferable, when possible, because SP can change in function | |
71 | body after prologue due to alloca, variadic arguments or other shenanigans. | |
72 | If that is the case in the caller frame, then PREV_SP will point to SP at | |
73 | the moment of function call, but it will be different from SP value at the | |
74 | end of the caller prologue. As a result it will not be possible to | |
75 | reconstruct caller's frame and go past it in the backtrace. Those things | |
76 | are unlikely to happen to FP - FP value at the moment of function call (as | |
77 | stored on stack in callee prologue) is also an FP value at the end of the | |
78 | caller's prologue. */ | |
79 | ||
80 | LONGEST frame_base_offset; | |
81 | ||
82 | /* Store addresses for registers saved in prologue. During prologue analysis | |
83 | GDB stores offsets relatively to "old SP", then after old SP is evaluated, | |
84 | offsets are replaced with absolute addresses. */ | |
098caef4 | 85 | trad_frame_saved_reg *saved_regs; |
ad0a504f AK |
86 | }; |
87 | ||
88 | /* Global debug flag. */ | |
89 | ||
fb0f5031 | 90 | bool arc_debug; |
ad0a504f | 91 | |
3be78afd AK |
92 | /* List of "maintenance print arc" commands. */ |
93 | ||
94 | static struct cmd_list_element *maintenance_print_arc_list = NULL; | |
95 | ||
995d3a19 SV |
96 | /* A set of registers that we expect to find in a tdesc_feature. These |
97 | are used in ARC_TDESC_INIT when processing the target description. */ | |
98 | ||
99 | struct arc_register_feature | |
100 | { | |
101 | /* Information for a single register. */ | |
102 | struct register_info | |
103 | { | |
104 | /* The GDB register number for this register. */ | |
105 | int regnum; | |
106 | ||
107 | /* List of names for this register. The first name in this list is the | |
108 | preferred name, the name GDB will use when describing this register. */ | |
109 | std::vector<const char *> names; | |
110 | ||
111 | /* When true, this register must be present in this feature set. */ | |
112 | bool required_p; | |
113 | }; | |
114 | ||
115 | /* The name for this feature. This is the name used to find this feature | |
116 | within the target description. */ | |
117 | const char *name; | |
118 | ||
119 | /* List of all the registers that we expect to encounter in this register | |
120 | set. */ | |
121 | std::vector<struct register_info> registers; | |
ad0a504f AK |
122 | }; |
123 | ||
995d3a19 SV |
124 | /* Obsolete feature names for backward compatibility. */ |
125 | static const char *ARC_CORE_V1_OBSOLETE_FEATURE_NAME | |
126 | = "org.gnu.gdb.arc.core.arcompact"; | |
127 | static const char *ARC_CORE_V2_OBSOLETE_FEATURE_NAME | |
128 | = "org.gnu.gdb.arc.core.v2"; | |
129 | static const char *ARC_CORE_V2_REDUCED_OBSOLETE_FEATURE_NAME | |
130 | = "org.gnu.gdb.arc.core-reduced.v2"; | |
131 | static const char *ARC_AUX_OBSOLETE_FEATURE_NAME | |
132 | = "org.gnu.gdb.arc.aux-minimal"; | |
133 | /* Modern feature names. */ | |
134 | static const char *ARC_CORE_FEATURE_NAME = "org.gnu.gdb.arc.core"; | |
135 | static const char *ARC_AUX_FEATURE_NAME = "org.gnu.gdb.arc.aux"; | |
136 | ||
137 | /* ARCv1 (ARC600, ARC601, ARC700) general core registers feature set. | |
138 | See also arc_update_acc_reg_names() for "accl/acch" names. */ | |
139 | ||
140 | static struct arc_register_feature arc_v1_core_reg_feature = | |
141 | { | |
142 | ARC_CORE_FEATURE_NAME, | |
143 | { | |
144 | { ARC_R0_REGNUM + 0, { "r0" }, true }, | |
145 | { ARC_R0_REGNUM + 1, { "r1" }, true }, | |
146 | { ARC_R0_REGNUM + 2, { "r2" }, true }, | |
147 | { ARC_R0_REGNUM + 3, { "r3" }, true }, | |
148 | { ARC_R0_REGNUM + 4, { "r4" }, false }, | |
149 | { ARC_R0_REGNUM + 5, { "r5" }, false }, | |
150 | { ARC_R0_REGNUM + 6, { "r6" }, false }, | |
151 | { ARC_R0_REGNUM + 7, { "r7" }, false }, | |
152 | { ARC_R0_REGNUM + 8, { "r8" }, false }, | |
153 | { ARC_R0_REGNUM + 9, { "r9" }, false }, | |
154 | { ARC_R0_REGNUM + 10, { "r10" }, true }, | |
155 | { ARC_R0_REGNUM + 11, { "r11" }, true }, | |
156 | { ARC_R0_REGNUM + 12, { "r12" }, true }, | |
157 | { ARC_R0_REGNUM + 13, { "r13" }, true }, | |
158 | { ARC_R0_REGNUM + 14, { "r14" }, true }, | |
159 | { ARC_R0_REGNUM + 15, { "r15" }, true }, | |
160 | { ARC_R0_REGNUM + 16, { "r16" }, false }, | |
161 | { ARC_R0_REGNUM + 17, { "r17" }, false }, | |
162 | { ARC_R0_REGNUM + 18, { "r18" }, false }, | |
163 | { ARC_R0_REGNUM + 19, { "r19" }, false }, | |
164 | { ARC_R0_REGNUM + 20, { "r20" }, false }, | |
165 | { ARC_R0_REGNUM + 21, { "r21" }, false }, | |
166 | { ARC_R0_REGNUM + 22, { "r22" }, false }, | |
167 | { ARC_R0_REGNUM + 23, { "r23" }, false }, | |
168 | { ARC_R0_REGNUM + 24, { "r24" }, false }, | |
169 | { ARC_R0_REGNUM + 25, { "r25" }, false }, | |
170 | { ARC_R0_REGNUM + 26, { "gp" }, true }, | |
171 | { ARC_R0_REGNUM + 27, { "fp" }, true }, | |
172 | { ARC_R0_REGNUM + 28, { "sp" }, true }, | |
173 | { ARC_R0_REGNUM + 29, { "ilink1" }, false }, | |
174 | { ARC_R0_REGNUM + 30, { "ilink2" }, false }, | |
175 | { ARC_R0_REGNUM + 31, { "blink" }, true }, | |
176 | { ARC_R0_REGNUM + 32, { "r32" }, false }, | |
177 | { ARC_R0_REGNUM + 33, { "r33" }, false }, | |
178 | { ARC_R0_REGNUM + 34, { "r34" }, false }, | |
179 | { ARC_R0_REGNUM + 35, { "r35" }, false }, | |
180 | { ARC_R0_REGNUM + 36, { "r36" }, false }, | |
181 | { ARC_R0_REGNUM + 37, { "r37" }, false }, | |
182 | { ARC_R0_REGNUM + 38, { "r38" }, false }, | |
183 | { ARC_R0_REGNUM + 39, { "r39" }, false }, | |
184 | { ARC_R0_REGNUM + 40, { "r40" }, false }, | |
185 | { ARC_R0_REGNUM + 41, { "r41" }, false }, | |
186 | { ARC_R0_REGNUM + 42, { "r42" }, false }, | |
187 | { ARC_R0_REGNUM + 43, { "r43" }, false }, | |
188 | { ARC_R0_REGNUM + 44, { "r44" }, false }, | |
189 | { ARC_R0_REGNUM + 45, { "r45" }, false }, | |
190 | { ARC_R0_REGNUM + 46, { "r46" }, false }, | |
191 | { ARC_R0_REGNUM + 47, { "r47" }, false }, | |
192 | { ARC_R0_REGNUM + 48, { "r48" }, false }, | |
193 | { ARC_R0_REGNUM + 49, { "r49" }, false }, | |
194 | { ARC_R0_REGNUM + 50, { "r50" }, false }, | |
195 | { ARC_R0_REGNUM + 51, { "r51" }, false }, | |
196 | { ARC_R0_REGNUM + 52, { "r52" }, false }, | |
197 | { ARC_R0_REGNUM + 53, { "r53" }, false }, | |
198 | { ARC_R0_REGNUM + 54, { "r54" }, false }, | |
199 | { ARC_R0_REGNUM + 55, { "r55" }, false }, | |
200 | { ARC_R0_REGNUM + 56, { "r56" }, false }, | |
201 | { ARC_R0_REGNUM + 57, { "r57" }, false }, | |
202 | { ARC_R0_REGNUM + 58, { "r58", "accl" }, false }, | |
203 | { ARC_R0_REGNUM + 59, { "r59", "acch" }, false }, | |
204 | { ARC_R0_REGNUM + 60, { "lp_count" }, false }, | |
205 | { ARC_R0_REGNUM + 61, { "reserved" }, false }, | |
206 | { ARC_R0_REGNUM + 62, { "limm" }, false }, | |
207 | { ARC_R0_REGNUM + 63, { "pcl" }, true } | |
208 | } | |
ad0a504f AK |
209 | }; |
210 | ||
995d3a19 SV |
211 | /* ARCv2 (ARCHS) general core registers feature set. See also |
212 | arc_update_acc_reg_names() for "accl/acch" names. */ | |
213 | ||
214 | static struct arc_register_feature arc_v2_core_reg_feature = | |
215 | { | |
216 | ARC_CORE_FEATURE_NAME, | |
217 | { | |
218 | { ARC_R0_REGNUM + 0, { "r0" }, true }, | |
219 | { ARC_R0_REGNUM + 1, { "r1" }, true }, | |
220 | { ARC_R0_REGNUM + 2, { "r2" }, true }, | |
221 | { ARC_R0_REGNUM + 3, { "r3" }, true }, | |
222 | { ARC_R0_REGNUM + 4, { "r4" }, false }, | |
223 | { ARC_R0_REGNUM + 5, { "r5" }, false }, | |
224 | { ARC_R0_REGNUM + 6, { "r6" }, false }, | |
225 | { ARC_R0_REGNUM + 7, { "r7" }, false }, | |
226 | { ARC_R0_REGNUM + 8, { "r8" }, false }, | |
227 | { ARC_R0_REGNUM + 9, { "r9" }, false }, | |
228 | { ARC_R0_REGNUM + 10, { "r10" }, true }, | |
229 | { ARC_R0_REGNUM + 11, { "r11" }, true }, | |
230 | { ARC_R0_REGNUM + 12, { "r12" }, true }, | |
231 | { ARC_R0_REGNUM + 13, { "r13" }, true }, | |
232 | { ARC_R0_REGNUM + 14, { "r14" }, true }, | |
233 | { ARC_R0_REGNUM + 15, { "r15" }, true }, | |
234 | { ARC_R0_REGNUM + 16, { "r16" }, false }, | |
235 | { ARC_R0_REGNUM + 17, { "r17" }, false }, | |
236 | { ARC_R0_REGNUM + 18, { "r18" }, false }, | |
237 | { ARC_R0_REGNUM + 19, { "r19" }, false }, | |
238 | { ARC_R0_REGNUM + 20, { "r20" }, false }, | |
239 | { ARC_R0_REGNUM + 21, { "r21" }, false }, | |
240 | { ARC_R0_REGNUM + 22, { "r22" }, false }, | |
241 | { ARC_R0_REGNUM + 23, { "r23" }, false }, | |
242 | { ARC_R0_REGNUM + 24, { "r24" }, false }, | |
243 | { ARC_R0_REGNUM + 25, { "r25" }, false }, | |
244 | { ARC_R0_REGNUM + 26, { "gp" }, true }, | |
245 | { ARC_R0_REGNUM + 27, { "fp" }, true }, | |
246 | { ARC_R0_REGNUM + 28, { "sp" }, true }, | |
247 | { ARC_R0_REGNUM + 29, { "ilink" }, false }, | |
248 | { ARC_R0_REGNUM + 30, { "r30" }, true }, | |
249 | { ARC_R0_REGNUM + 31, { "blink" }, true }, | |
250 | { ARC_R0_REGNUM + 32, { "r32" }, false }, | |
251 | { ARC_R0_REGNUM + 33, { "r33" }, false }, | |
252 | { ARC_R0_REGNUM + 34, { "r34" }, false }, | |
253 | { ARC_R0_REGNUM + 35, { "r35" }, false }, | |
254 | { ARC_R0_REGNUM + 36, { "r36" }, false }, | |
255 | { ARC_R0_REGNUM + 37, { "r37" }, false }, | |
256 | { ARC_R0_REGNUM + 38, { "r38" }, false }, | |
257 | { ARC_R0_REGNUM + 39, { "r39" }, false }, | |
258 | { ARC_R0_REGNUM + 40, { "r40" }, false }, | |
259 | { ARC_R0_REGNUM + 41, { "r41" }, false }, | |
260 | { ARC_R0_REGNUM + 42, { "r42" }, false }, | |
261 | { ARC_R0_REGNUM + 43, { "r43" }, false }, | |
262 | { ARC_R0_REGNUM + 44, { "r44" }, false }, | |
263 | { ARC_R0_REGNUM + 45, { "r45" }, false }, | |
264 | { ARC_R0_REGNUM + 46, { "r46" }, false }, | |
265 | { ARC_R0_REGNUM + 47, { "r47" }, false }, | |
266 | { ARC_R0_REGNUM + 48, { "r48" }, false }, | |
267 | { ARC_R0_REGNUM + 49, { "r49" }, false }, | |
268 | { ARC_R0_REGNUM + 50, { "r50" }, false }, | |
269 | { ARC_R0_REGNUM + 51, { "r51" }, false }, | |
270 | { ARC_R0_REGNUM + 52, { "r52" }, false }, | |
271 | { ARC_R0_REGNUM + 53, { "r53" }, false }, | |
272 | { ARC_R0_REGNUM + 54, { "r54" }, false }, | |
273 | { ARC_R0_REGNUM + 55, { "r55" }, false }, | |
274 | { ARC_R0_REGNUM + 56, { "r56" }, false }, | |
275 | { ARC_R0_REGNUM + 57, { "r57" }, false }, | |
276 | { ARC_R0_REGNUM + 58, { "r58", "accl" }, false }, | |
277 | { ARC_R0_REGNUM + 59, { "r59", "acch" }, false }, | |
278 | { ARC_R0_REGNUM + 60, { "lp_count" }, false }, | |
279 | { ARC_R0_REGNUM + 61, { "reserved" }, false }, | |
280 | { ARC_R0_REGNUM + 62, { "limm" }, false }, | |
281 | { ARC_R0_REGNUM + 63, { "pcl" }, true } | |
282 | } | |
ad0a504f AK |
283 | }; |
284 | ||
995d3a19 SV |
285 | /* The common auxiliary registers feature set. The REGNUM field |
286 | must match the ARC_REGNUM enum in arc-tdep.h. */ | |
a87dc45a | 287 | |
995d3a19 SV |
288 | static const struct arc_register_feature arc_common_aux_reg_feature = |
289 | { | |
290 | ARC_AUX_FEATURE_NAME, | |
291 | { | |
292 | { ARC_FIRST_AUX_REGNUM + 0, { "pc" }, true }, | |
293 | { ARC_FIRST_AUX_REGNUM + 1, { "status32" }, true }, | |
294 | { ARC_FIRST_AUX_REGNUM + 2, { "lp_start" }, false }, | |
295 | { ARC_FIRST_AUX_REGNUM + 3, { "lp_end" }, false }, | |
296 | { ARC_FIRST_AUX_REGNUM + 4, { "bta" }, false } | |
297 | } | |
298 | }; | |
299 | ||
300 | static char *arc_disassembler_options = NULL; | |
817a7585 | 301 | |
fe5f7374 AK |
302 | /* Functions are sorted in the order as they are used in the |
303 | _initialize_arc_tdep (), which uses the same order as gdbarch.h. Static | |
304 | functions are defined before the first invocation. */ | |
305 | ||
eea78757 AK |
306 | /* Returns an unsigned value of OPERAND_NUM in instruction INSN. |
307 | For relative branch instructions returned value is an offset, not an actual | |
308 | branch target. */ | |
309 | ||
310 | static ULONGEST | |
311 | arc_insn_get_operand_value (const struct arc_instruction &insn, | |
312 | unsigned int operand_num) | |
313 | { | |
314 | switch (insn.operands[operand_num].kind) | |
315 | { | |
316 | case ARC_OPERAND_KIND_LIMM: | |
317 | gdb_assert (insn.limm_p); | |
318 | return insn.limm_value; | |
319 | case ARC_OPERAND_KIND_SHIMM: | |
320 | return insn.operands[operand_num].value; | |
321 | default: | |
322 | /* Value in instruction is a register number. */ | |
323 | struct regcache *regcache = get_current_regcache (); | |
324 | ULONGEST value; | |
325 | regcache_cooked_read_unsigned (regcache, | |
326 | insn.operands[operand_num].value, | |
327 | &value); | |
328 | return value; | |
329 | } | |
330 | } | |
331 | ||
332 | /* Like arc_insn_get_operand_value, but returns a signed value. */ | |
333 | ||
334 | static LONGEST | |
335 | arc_insn_get_operand_value_signed (const struct arc_instruction &insn, | |
336 | unsigned int operand_num) | |
337 | { | |
338 | switch (insn.operands[operand_num].kind) | |
339 | { | |
340 | case ARC_OPERAND_KIND_LIMM: | |
341 | gdb_assert (insn.limm_p); | |
342 | /* Convert unsigned raw value to signed one. This assumes 2's | |
343 | complement arithmetic, but so is the LONG_MIN value from generic | |
344 | defs.h and that assumption is true for ARC. */ | |
345 | gdb_static_assert (sizeof (insn.limm_value) == sizeof (int)); | |
346 | return (((LONGEST) insn.limm_value) ^ INT_MIN) - INT_MIN; | |
347 | case ARC_OPERAND_KIND_SHIMM: | |
348 | /* Sign conversion has been done by binutils. */ | |
349 | return insn.operands[operand_num].value; | |
350 | default: | |
351 | /* Value in instruction is a register number. */ | |
352 | struct regcache *regcache = get_current_regcache (); | |
353 | LONGEST value; | |
354 | regcache_cooked_read_signed (regcache, | |
355 | insn.operands[operand_num].value, | |
356 | &value); | |
357 | return value; | |
358 | } | |
359 | } | |
360 | ||
361 | /* Get register with base address of memory operation. */ | |
362 | ||
cb8c24b6 | 363 | static int |
eea78757 AK |
364 | arc_insn_get_memory_base_reg (const struct arc_instruction &insn) |
365 | { | |
366 | /* POP_S and PUSH_S have SP as an implicit argument in a disassembler. */ | |
367 | if (insn.insn_class == PUSH || insn.insn_class == POP) | |
368 | return ARC_SP_REGNUM; | |
369 | ||
370 | gdb_assert (insn.insn_class == LOAD || insn.insn_class == STORE); | |
371 | ||
372 | /* Other instructions all have at least two operands: operand 0 is data, | |
373 | operand 1 is address. Operand 2 is offset from address. However, see | |
374 | comment to arc_instruction.operands - in some cases, third operand may be | |
375 | missing, namely if it is 0. */ | |
376 | gdb_assert (insn.operands_count >= 2); | |
377 | return insn.operands[1].value; | |
378 | } | |
379 | ||
380 | /* Get offset of a memory operation INSN. */ | |
381 | ||
cb8c24b6 | 382 | static CORE_ADDR |
eea78757 AK |
383 | arc_insn_get_memory_offset (const struct arc_instruction &insn) |
384 | { | |
385 | /* POP_S and PUSH_S have offset as an implicit argument in a | |
386 | disassembler. */ | |
387 | if (insn.insn_class == POP) | |
388 | return 4; | |
389 | else if (insn.insn_class == PUSH) | |
390 | return -4; | |
391 | ||
392 | gdb_assert (insn.insn_class == LOAD || insn.insn_class == STORE); | |
393 | ||
394 | /* Other instructions all have at least two operands: operand 0 is data, | |
395 | operand 1 is address. Operand 2 is offset from address. However, see | |
396 | comment to arc_instruction.operands - in some cases, third operand may be | |
397 | missing, namely if it is 0. */ | |
398 | if (insn.operands_count < 3) | |
399 | return 0; | |
400 | ||
401 | CORE_ADDR value = arc_insn_get_operand_value (insn, 2); | |
402 | /* Handle scaling. */ | |
403 | if (insn.writeback_mode == ARC_WRITEBACK_AS) | |
404 | { | |
405 | /* Byte data size is not valid for AS. Halfword means shift by 1 bit. | |
406 | Word and double word means shift by 2 bits. */ | |
407 | gdb_assert (insn.data_size_mode != ARC_SCALING_B); | |
408 | if (insn.data_size_mode == ARC_SCALING_H) | |
409 | value <<= 1; | |
410 | else | |
411 | value <<= 2; | |
412 | } | |
413 | return value; | |
414 | } | |
415 | ||
eea78757 AK |
416 | CORE_ADDR |
417 | arc_insn_get_branch_target (const struct arc_instruction &insn) | |
418 | { | |
419 | gdb_assert (insn.is_control_flow); | |
420 | ||
421 | /* BI [c]: PC = nextPC + (c << 2). */ | |
422 | if (insn.insn_class == BI) | |
423 | { | |
424 | ULONGEST reg_value = arc_insn_get_operand_value (insn, 0); | |
425 | return arc_insn_get_linear_next_pc (insn) + (reg_value << 2); | |
426 | } | |
427 | /* BIH [c]: PC = nextPC + (c << 1). */ | |
428 | else if (insn.insn_class == BIH) | |
429 | { | |
430 | ULONGEST reg_value = arc_insn_get_operand_value (insn, 0); | |
431 | return arc_insn_get_linear_next_pc (insn) + (reg_value << 1); | |
432 | } | |
433 | /* JLI and EI. */ | |
434 | /* JLI and EI depend on optional AUX registers. Not supported right now. */ | |
435 | else if (insn.insn_class == JLI) | |
436 | { | |
437 | fprintf_unfiltered (gdb_stderr, | |
438 | "JLI_S instruction is not supported by the GDB."); | |
439 | return 0; | |
440 | } | |
441 | else if (insn.insn_class == EI) | |
442 | { | |
443 | fprintf_unfiltered (gdb_stderr, | |
444 | "EI_S instruction is not supported by the GDB."); | |
445 | return 0; | |
446 | } | |
447 | /* LEAVE_S: PC = BLINK. */ | |
448 | else if (insn.insn_class == LEAVE) | |
449 | { | |
450 | struct regcache *regcache = get_current_regcache (); | |
451 | ULONGEST value; | |
452 | regcache_cooked_read_unsigned (regcache, ARC_BLINK_REGNUM, &value); | |
453 | return value; | |
454 | } | |
455 | /* BBIT0/1, BRcc: PC = currentPC + operand. */ | |
456 | else if (insn.insn_class == BBIT0 || insn.insn_class == BBIT1 | |
457 | || insn.insn_class == BRCC) | |
458 | { | |
459 | /* Most instructions has branch target as their sole argument. However | |
460 | conditional brcc/bbit has it as a third operand. */ | |
461 | CORE_ADDR pcrel_addr = arc_insn_get_operand_value (insn, 2); | |
462 | ||
463 | /* Offset is relative to the 4-byte aligned address of the current | |
464 | instruction, hence last two bits should be truncated. */ | |
465 | return pcrel_addr + align_down (insn.address, 4); | |
466 | } | |
467 | /* B, Bcc, BL, BLcc, LP, LPcc: PC = currentPC + operand. */ | |
468 | else if (insn.insn_class == BRANCH || insn.insn_class == LOOP) | |
469 | { | |
470 | CORE_ADDR pcrel_addr = arc_insn_get_operand_value (insn, 0); | |
471 | ||
472 | /* Offset is relative to the 4-byte aligned address of the current | |
473 | instruction, hence last two bits should be truncated. */ | |
474 | return pcrel_addr + align_down (insn.address, 4); | |
475 | } | |
476 | /* J, Jcc, JL, JLcc: PC = operand. */ | |
477 | else if (insn.insn_class == JUMP) | |
478 | { | |
479 | /* All jumps are single-operand. */ | |
480 | return arc_insn_get_operand_value (insn, 0); | |
481 | } | |
482 | ||
483 | /* This is some new and unknown instruction. */ | |
484 | gdb_assert_not_reached ("Unknown branch instruction."); | |
485 | } | |
486 | ||
487 | /* Dump INSN into gdb_stdlog. */ | |
488 | ||
cb8c24b6 | 489 | static void |
eea78757 AK |
490 | arc_insn_dump (const struct arc_instruction &insn) |
491 | { | |
492 | struct gdbarch *gdbarch = target_gdbarch (); | |
493 | ||
494 | arc_print ("Dumping arc_instruction at %s\n", | |
495 | paddress (gdbarch, insn.address)); | |
496 | arc_print ("\tlength = %u\n", insn.length); | |
497 | ||
498 | if (!insn.valid) | |
499 | { | |
500 | arc_print ("\tThis is not a valid ARC instruction.\n"); | |
501 | return; | |
502 | } | |
503 | ||
504 | arc_print ("\tlength_with_limm = %u\n", insn.length + (insn.limm_p ? 4 : 0)); | |
505 | arc_print ("\tcc = 0x%x\n", insn.condition_code); | |
506 | arc_print ("\tinsn_class = %u\n", insn.insn_class); | |
507 | arc_print ("\tis_control_flow = %i\n", insn.is_control_flow); | |
508 | arc_print ("\thas_delay_slot = %i\n", insn.has_delay_slot); | |
509 | ||
510 | CORE_ADDR next_pc = arc_insn_get_linear_next_pc (insn); | |
511 | arc_print ("\tlinear_next_pc = %s\n", paddress (gdbarch, next_pc)); | |
512 | ||
513 | if (insn.is_control_flow) | |
514 | { | |
515 | CORE_ADDR t = arc_insn_get_branch_target (insn); | |
516 | arc_print ("\tbranch_target = %s\n", paddress (gdbarch, t)); | |
517 | } | |
518 | ||
519 | arc_print ("\tlimm_p = %i\n", insn.limm_p); | |
520 | if (insn.limm_p) | |
521 | arc_print ("\tlimm_value = 0x%08x\n", insn.limm_value); | |
522 | ||
523 | if (insn.insn_class == STORE || insn.insn_class == LOAD | |
524 | || insn.insn_class == PUSH || insn.insn_class == POP) | |
525 | { | |
526 | arc_print ("\twriteback_mode = %u\n", insn.writeback_mode); | |
527 | arc_print ("\tdata_size_mode = %u\n", insn.data_size_mode); | |
528 | arc_print ("\tmemory_base_register = %s\n", | |
529 | gdbarch_register_name (gdbarch, | |
530 | arc_insn_get_memory_base_reg (insn))); | |
531 | /* get_memory_offset returns an unsigned CORE_ADDR, but treat it as a | |
532 | LONGEST for a nicer representation. */ | |
533 | arc_print ("\taddr_offset = %s\n", | |
534 | plongest (arc_insn_get_memory_offset (insn))); | |
535 | } | |
536 | ||
537 | arc_print ("\toperands_count = %u\n", insn.operands_count); | |
538 | for (unsigned int i = 0; i < insn.operands_count; ++i) | |
539 | { | |
540 | int is_reg = (insn.operands[i].kind == ARC_OPERAND_KIND_REG); | |
541 | ||
542 | arc_print ("\toperand[%u] = {\n", i); | |
543 | arc_print ("\t\tis_reg = %i\n", is_reg); | |
544 | if (is_reg) | |
545 | arc_print ("\t\tregister = %s\n", | |
546 | gdbarch_register_name (gdbarch, insn.operands[i].value)); | |
547 | /* Don't know if this value is signed or not, so print both | |
548 | representations. This tends to look quite ugly, especially for big | |
549 | numbers. */ | |
550 | arc_print ("\t\tunsigned value = %s\n", | |
551 | pulongest (arc_insn_get_operand_value (insn, i))); | |
552 | arc_print ("\t\tsigned value = %s\n", | |
553 | plongest (arc_insn_get_operand_value_signed (insn, i))); | |
554 | arc_print ("\t}\n"); | |
555 | } | |
556 | } | |
557 | ||
558 | CORE_ADDR | |
559 | arc_insn_get_linear_next_pc (const struct arc_instruction &insn) | |
560 | { | |
561 | /* In ARC long immediate is always 4 bytes. */ | |
562 | return (insn.address + insn.length + (insn.limm_p ? 4 : 0)); | |
563 | } | |
564 | ||
ad0a504f AK |
565 | /* Implement the "write_pc" gdbarch method. |
566 | ||
567 | In ARC PC register is a normal register so in most cases setting PC value | |
568 | is a straightforward process: debugger just writes PC value. However it | |
569 | gets trickier in case when current instruction is an instruction in delay | |
570 | slot. In this case CPU will execute instruction at current PC value, then | |
571 | will set PC to the current value of BTA register; also current instruction | |
572 | cannot be branch/jump and some of the other instruction types. Thus if | |
573 | debugger would try to just change PC value in this case, this instruction | |
574 | will get executed, but then core will "jump" to the original branch target. | |
575 | ||
576 | Whether current instruction is a delay-slot instruction or not is indicated | |
577 | by DE bit in STATUS32 register indicates if current instruction is a delay | |
578 | slot instruction. This bit is writable by debug host, which allows debug | |
579 | host to prevent core from jumping after the delay slot instruction. It | |
580 | also works in another direction: setting this bit will make core to treat | |
581 | any current instructions as a delay slot instruction and to set PC to the | |
582 | current value of BTA register. | |
583 | ||
584 | To workaround issues with changing PC register while in delay slot | |
585 | instruction, debugger should check for the STATUS32.DE bit and reset it if | |
586 | it is set. No other change is required in this function. Most common | |
587 | case, where this function might be required is calling inferior functions | |
588 | from debugger. Generic GDB logic handles this pretty well: current values | |
589 | of registers are stored, value of PC is changed (that is the job of this | |
590 | function), and after inferior function is executed, GDB restores all | |
591 | registers, include BTA and STATUS32, which also means that core is returned | |
592 | to its original state of being halted on delay slot instructions. | |
593 | ||
594 | This method is useless for ARC 600, because it doesn't have externally | |
595 | exposed BTA register. In the case of ARC 600 it is impossible to restore | |
596 | core to its state in all occasions thus core should never be halted (from | |
597 | the perspective of debugger host) in the delay slot. */ | |
598 | ||
599 | static void | |
600 | arc_write_pc (struct regcache *regcache, CORE_ADDR new_pc) | |
601 | { | |
ac7936df | 602 | struct gdbarch *gdbarch = regcache->arch (); |
ad0a504f | 603 | |
d8d1feb4 SM |
604 | arc_debug_printf ("Writing PC, new value=%s", |
605 | paddress (gdbarch, new_pc)); | |
ad0a504f AK |
606 | |
607 | regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), | |
608 | new_pc); | |
609 | ||
610 | ULONGEST status32; | |
611 | regcache_cooked_read_unsigned (regcache, gdbarch_ps_regnum (gdbarch), | |
612 | &status32); | |
613 | ||
8d7f0635 | 614 | if ((status32 & ARC_STATUS32_DE_MASK) != 0) |
ad0a504f | 615 | { |
d8d1feb4 | 616 | arc_debug_printf ("Changing PC while in delay slot. Will " |
ad0a504f | 617 | "reset STATUS32.DE bit to zero. Value of STATUS32 " |
d8d1feb4 | 618 | "register is 0x%s", |
ad0a504f | 619 | phex (status32, ARC_REGISTER_SIZE)); |
ad0a504f AK |
620 | |
621 | /* Reset bit and write to the cache. */ | |
622 | status32 &= ~0x40; | |
623 | regcache_cooked_write_unsigned (regcache, gdbarch_ps_regnum (gdbarch), | |
624 | status32); | |
625 | } | |
626 | } | |
627 | ||
628 | /* Implement the "virtual_frame_pointer" gdbarch method. | |
629 | ||
630 | According to ABI the FP (r27) is used to point to the middle of the current | |
631 | stack frame, just below the saved FP and before local variables, register | |
632 | spill area and outgoing args. However for optimization levels above O2 and | |
633 | in any case in leaf functions, the frame pointer is usually not set at all. | |
634 | The exception being when handling nested functions. | |
635 | ||
636 | We use this function to return a "virtual" frame pointer, marking the start | |
637 | of the current stack frame as a register-offset pair. If the FP is not | |
638 | being used, then it should return SP, with an offset of the frame size. | |
639 | ||
640 | The current implementation doesn't actually know the frame size, nor | |
641 | whether the FP is actually being used, so for now we just return SP and an | |
642 | offset of zero. This is no worse than other architectures, but is needed | |
643 | to avoid assertion failures. | |
644 | ||
645 | TODO: Can we determine the frame size to get a correct offset? | |
646 | ||
647 | PC is a program counter where we need the virtual FP. REG_PTR is the base | |
648 | register used for the virtual FP. OFFSET_PTR is the offset used for the | |
649 | virtual FP. */ | |
650 | ||
651 | static void | |
652 | arc_virtual_frame_pointer (struct gdbarch *gdbarch, CORE_ADDR pc, | |
653 | int *reg_ptr, LONGEST *offset_ptr) | |
654 | { | |
655 | *reg_ptr = gdbarch_sp_regnum (gdbarch); | |
656 | *offset_ptr = 0; | |
657 | } | |
658 | ||
ad0a504f AK |
659 | /* Implement the "push_dummy_call" gdbarch method. |
660 | ||
661 | Stack Frame Layout | |
662 | ||
663 | This shows the layout of the stack frame for the general case of a | |
664 | function call; a given function might not have a variable number of | |
665 | arguments or local variables, or might not save any registers, so it would | |
666 | not have the corresponding frame areas. Additionally, a leaf function | |
667 | (i.e. one which calls no other functions) does not need to save the | |
668 | contents of the BLINK register (which holds its return address), and a | |
669 | function might not have a frame pointer. | |
670 | ||
671 | The stack grows downward, so SP points below FP in memory; SP always | |
672 | points to the last used word on the stack, not the first one. | |
673 | ||
dda83cd7 SM |
674 | | | | |
675 | | arg word N | | caller's | |
676 | | : | | frame | |
677 | | arg word 10 | | | |
678 | | arg word 9 | | | |
679 | old SP ---> +-----------------------+ --+ | |
680 | | | | | |
681 | | callee-saved | | | |
682 | | registers | | | |
683 | | including fp, blink | | | |
684 | | | | callee's | |
685 | new FP ---> +-----------------------+ | frame | |
686 | | | | | |
687 | | local | | | |
688 | | variables | | | |
689 | | | | | |
690 | | register | | | |
691 | | spill area | | | |
692 | | | | | |
693 | | outgoing args | | | |
694 | | | | | |
695 | new SP ---> +-----------------------+ --+ | |
696 | | | | |
697 | | unused | | |
698 | | | | |
699 | | | |
700 | | | |
701 | V | |
702 | downwards | |
ad0a504f AK |
703 | |
704 | The list of arguments to be passed to a function is considered to be a | |
705 | sequence of _N_ words (as though all the parameters were stored in order in | |
706 | memory with each parameter occupying an integral number of words). Words | |
707 | 1..8 are passed in registers 0..7; if the function has more than 8 words of | |
708 | arguments then words 9..@em N are passed on the stack in the caller's frame. | |
709 | ||
710 | If the function has a variable number of arguments, e.g. it has a form such | |
711 | as `function (p1, p2, ...);' and _P_ words are required to hold the values | |
712 | of the named parameters (which are passed in registers 0..@em P -1), then | |
713 | the remaining 8 - _P_ words passed in registers _P_..7 are spilled into the | |
714 | top of the frame so that the anonymous parameter words occupy a continuous | |
715 | region. | |
716 | ||
717 | Any arguments are already in target byte order. We just need to store | |
718 | them! | |
719 | ||
720 | BP_ADDR is the return address where breakpoint must be placed. NARGS is | |
721 | the number of arguments to the function. ARGS is the arguments values (in | |
722 | target byte order). SP is the Current value of SP register. STRUCT_RETURN | |
723 | is TRUE if structures are returned by the function. STRUCT_ADDR is the | |
724 | hidden address for returning a struct. Returns SP of a new frame. */ | |
725 | ||
726 | static CORE_ADDR | |
727 | arc_push_dummy_call (struct gdbarch *gdbarch, struct value *function, | |
728 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, | |
cf84fa6b AH |
729 | struct value **args, CORE_ADDR sp, |
730 | function_call_return_method return_method, | |
ad0a504f AK |
731 | CORE_ADDR struct_addr) |
732 | { | |
d8d1feb4 | 733 | arc_debug_printf ("nargs = %d", nargs); |
ad0a504f AK |
734 | |
735 | int arg_reg = ARC_FIRST_ARG_REGNUM; | |
736 | ||
737 | /* Push the return address. */ | |
738 | regcache_cooked_write_unsigned (regcache, ARC_BLINK_REGNUM, bp_addr); | |
739 | ||
740 | /* Are we returning a value using a structure return instead of a normal | |
741 | value return? If so, struct_addr is the address of the reserved space for | |
742 | the return structure to be written on the stack, and that address is | |
743 | passed to that function as a hidden first argument. */ | |
cf84fa6b | 744 | if (return_method == return_method_struct) |
ad0a504f AK |
745 | { |
746 | /* Pass the return address in the first argument register. */ | |
747 | regcache_cooked_write_unsigned (regcache, arg_reg, struct_addr); | |
748 | ||
d8d1feb4 SM |
749 | arc_debug_printf ("struct return address %s passed in R%d", |
750 | print_core_address (gdbarch, struct_addr), arg_reg); | |
ad0a504f AK |
751 | |
752 | arg_reg++; | |
753 | } | |
754 | ||
755 | if (nargs > 0) | |
756 | { | |
757 | unsigned int total_space = 0; | |
758 | ||
759 | /* How much space do the arguments occupy in total? Must round each | |
760 | argument's size up to an integral number of words. */ | |
761 | for (int i = 0; i < nargs; i++) | |
762 | { | |
763 | unsigned int len = TYPE_LENGTH (value_type (args[i])); | |
764 | unsigned int space = align_up (len, 4); | |
765 | ||
766 | total_space += space; | |
767 | ||
d8d1feb4 | 768 | arc_debug_printf ("arg %d: %u bytes -> %u", i, len, space); |
ad0a504f AK |
769 | } |
770 | ||
771 | /* Allocate a buffer to hold a memory image of the arguments. */ | |
772 | gdb_byte *memory_image = XCNEWVEC (gdb_byte, total_space); | |
773 | ||
774 | /* Now copy all of the arguments into the buffer, correctly aligned. */ | |
775 | gdb_byte *data = memory_image; | |
776 | for (int i = 0; i < nargs; i++) | |
777 | { | |
778 | unsigned int len = TYPE_LENGTH (value_type (args[i])); | |
779 | unsigned int space = align_up (len, 4); | |
780 | ||
781 | memcpy (data, value_contents (args[i]), (size_t) len); | |
d8d1feb4 SM |
782 | arc_debug_printf ("copying arg %d, val 0x%08x, len %d to mem", |
783 | i, *((int *) value_contents (args[i])), len); | |
ad0a504f AK |
784 | |
785 | data += space; | |
786 | } | |
787 | ||
788 | /* Now load as much as possible of the memory image into registers. */ | |
789 | data = memory_image; | |
790 | while (arg_reg <= ARC_LAST_ARG_REGNUM) | |
791 | { | |
d8d1feb4 SM |
792 | arc_debug_printf ("passing 0x%02x%02x%02x%02x in register R%d", |
793 | data[0], data[1], data[2], data[3], arg_reg); | |
ad0a504f AK |
794 | |
795 | /* Note we don't use write_unsigned here, since that would convert | |
796 | the byte order, but we are already in the correct byte order. */ | |
b66f5587 | 797 | regcache->cooked_write (arg_reg, data); |
ad0a504f AK |
798 | |
799 | data += ARC_REGISTER_SIZE; | |
800 | total_space -= ARC_REGISTER_SIZE; | |
801 | ||
802 | /* All the data is now in registers. */ | |
803 | if (total_space == 0) | |
804 | break; | |
805 | ||
806 | arg_reg++; | |
807 | } | |
808 | ||
809 | /* If there is any data left, push it onto the stack (in a single write | |
810 | operation). */ | |
811 | if (total_space > 0) | |
812 | { | |
d8d1feb4 | 813 | arc_debug_printf ("passing %d bytes on stack\n", total_space); |
ad0a504f AK |
814 | |
815 | sp -= total_space; | |
816 | write_memory (sp, data, (int) total_space); | |
817 | } | |
818 | ||
819 | xfree (memory_image); | |
820 | } | |
821 | ||
822 | /* Finally, update the SP register. */ | |
823 | regcache_cooked_write_unsigned (regcache, gdbarch_sp_regnum (gdbarch), sp); | |
824 | ||
825 | return sp; | |
826 | } | |
827 | ||
828 | /* Implement the "push_dummy_code" gdbarch method. | |
829 | ||
830 | We don't actually push any code. We just identify where a breakpoint can | |
831 | be inserted to which we are can return and the resume address where we | |
832 | should be called. | |
833 | ||
834 | ARC does not necessarily have an executable stack, so we can't put the | |
835 | return breakpoint there. Instead we put it at the entry point of the | |
836 | function. This means the SP is unchanged. | |
837 | ||
838 | SP is a current stack pointer FUNADDR is an address of the function to be | |
839 | called. ARGS is arguments to pass. NARGS is a number of args to pass. | |
840 | VALUE_TYPE is a type of value returned. REAL_PC is a resume address when | |
841 | the function is called. BP_ADDR is an address where breakpoint should be | |
842 | set. Returns the updated stack pointer. */ | |
843 | ||
844 | static CORE_ADDR | |
845 | arc_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp, CORE_ADDR funaddr, | |
846 | struct value **args, int nargs, struct type *value_type, | |
847 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, | |
848 | struct regcache *regcache) | |
849 | { | |
850 | *real_pc = funaddr; | |
851 | *bp_addr = entry_point_address (); | |
852 | return sp; | |
853 | } | |
854 | ||
855 | /* Implement the "cannot_fetch_register" gdbarch method. */ | |
856 | ||
857 | static int | |
858 | arc_cannot_fetch_register (struct gdbarch *gdbarch, int regnum) | |
859 | { | |
296ec4fa AK |
860 | /* Assume that register is readable if it is unknown. LIMM and RESERVED are |
861 | not real registers, but specific register numbers. They are available as | |
862 | regnums to align architectural register numbers with GDB internal regnums, | |
863 | but they shouldn't appear in target descriptions generated by | |
864 | GDB-servers. */ | |
865 | switch (regnum) | |
866 | { | |
867 | case ARC_RESERVED_REGNUM: | |
868 | case ARC_LIMM_REGNUM: | |
869 | return true; | |
870 | default: | |
871 | return false; | |
872 | } | |
ad0a504f AK |
873 | } |
874 | ||
875 | /* Implement the "cannot_store_register" gdbarch method. */ | |
876 | ||
877 | static int | |
878 | arc_cannot_store_register (struct gdbarch *gdbarch, int regnum) | |
879 | { | |
296ec4fa AK |
880 | /* Assume that register is writable if it is unknown. See comment in |
881 | arc_cannot_fetch_register about LIMM and RESERVED. */ | |
ad0a504f AK |
882 | switch (regnum) |
883 | { | |
296ec4fa AK |
884 | case ARC_RESERVED_REGNUM: |
885 | case ARC_LIMM_REGNUM: | |
ad0a504f | 886 | case ARC_PCL_REGNUM: |
296ec4fa | 887 | return true; |
ad0a504f | 888 | default: |
296ec4fa | 889 | return false; |
ad0a504f AK |
890 | } |
891 | } | |
892 | ||
893 | /* Get the return value of a function from the registers/memory used to | |
894 | return it, according to the convention used by the ABI - 4-bytes values are | |
895 | in the R0, while 8-byte values are in the R0-R1. | |
896 | ||
897 | TODO: This implementation ignores the case of "complex double", where | |
898 | according to ABI, value is returned in the R0-R3 registers. | |
899 | ||
900 | TYPE is a returned value's type. VALBUF is a buffer for the returned | |
901 | value. */ | |
902 | ||
903 | static void | |
904 | arc_extract_return_value (struct gdbarch *gdbarch, struct type *type, | |
905 | struct regcache *regcache, gdb_byte *valbuf) | |
906 | { | |
907 | unsigned int len = TYPE_LENGTH (type); | |
908 | ||
d8d1feb4 | 909 | arc_debug_printf ("called"); |
ad0a504f AK |
910 | |
911 | if (len <= ARC_REGISTER_SIZE) | |
912 | { | |
913 | ULONGEST val; | |
914 | ||
915 | /* Get the return value from one register. */ | |
916 | regcache_cooked_read_unsigned (regcache, ARC_R0_REGNUM, &val); | |
917 | store_unsigned_integer (valbuf, (int) len, | |
918 | gdbarch_byte_order (gdbarch), val); | |
919 | ||
d8d1feb4 | 920 | arc_debug_printf ("returning 0x%s", phex (val, ARC_REGISTER_SIZE)); |
ad0a504f AK |
921 | } |
922 | else if (len <= ARC_REGISTER_SIZE * 2) | |
923 | { | |
924 | ULONGEST low, high; | |
925 | ||
926 | /* Get the return value from two registers. */ | |
927 | regcache_cooked_read_unsigned (regcache, ARC_R0_REGNUM, &low); | |
928 | regcache_cooked_read_unsigned (regcache, ARC_R1_REGNUM, &high); | |
929 | ||
930 | store_unsigned_integer (valbuf, ARC_REGISTER_SIZE, | |
931 | gdbarch_byte_order (gdbarch), low); | |
932 | store_unsigned_integer (valbuf + ARC_REGISTER_SIZE, | |
933 | (int) len - ARC_REGISTER_SIZE, | |
934 | gdbarch_byte_order (gdbarch), high); | |
935 | ||
d8d1feb4 SM |
936 | arc_debug_printf ("returning 0x%s%s", |
937 | phex (high, ARC_REGISTER_SIZE), | |
938 | phex (low, ARC_REGISTER_SIZE)); | |
ad0a504f AK |
939 | } |
940 | else | |
941 | error (_("arc: extract_return_value: type length %u too large"), len); | |
942 | } | |
943 | ||
944 | ||
945 | /* Store the return value of a function into the registers/memory used to | |
946 | return it, according to the convention used by the ABI. | |
947 | ||
948 | TODO: This implementation ignores the case of "complex double", where | |
949 | according to ABI, value is returned in the R0-R3 registers. | |
950 | ||
951 | TYPE is a returned value's type. VALBUF is a buffer with the value to | |
952 | return. */ | |
953 | ||
954 | static void | |
955 | arc_store_return_value (struct gdbarch *gdbarch, struct type *type, | |
956 | struct regcache *regcache, const gdb_byte *valbuf) | |
957 | { | |
958 | unsigned int len = TYPE_LENGTH (type); | |
959 | ||
d8d1feb4 | 960 | arc_debug_printf ("called"); |
ad0a504f AK |
961 | |
962 | if (len <= ARC_REGISTER_SIZE) | |
963 | { | |
964 | ULONGEST val; | |
965 | ||
966 | /* Put the return value into one register. */ | |
967 | val = extract_unsigned_integer (valbuf, (int) len, | |
968 | gdbarch_byte_order (gdbarch)); | |
969 | regcache_cooked_write_unsigned (regcache, ARC_R0_REGNUM, val); | |
970 | ||
d8d1feb4 | 971 | arc_debug_printf ("storing 0x%s", phex (val, ARC_REGISTER_SIZE)); |
ad0a504f AK |
972 | } |
973 | else if (len <= ARC_REGISTER_SIZE * 2) | |
974 | { | |
975 | ULONGEST low, high; | |
976 | ||
977 | /* Put the return value into two registers. */ | |
978 | low = extract_unsigned_integer (valbuf, ARC_REGISTER_SIZE, | |
979 | gdbarch_byte_order (gdbarch)); | |
980 | high = extract_unsigned_integer (valbuf + ARC_REGISTER_SIZE, | |
981 | (int) len - ARC_REGISTER_SIZE, | |
982 | gdbarch_byte_order (gdbarch)); | |
983 | ||
984 | regcache_cooked_write_unsigned (regcache, ARC_R0_REGNUM, low); | |
985 | regcache_cooked_write_unsigned (regcache, ARC_R1_REGNUM, high); | |
986 | ||
d8d1feb4 SM |
987 | arc_debug_printf ("storing 0x%s%s", |
988 | phex (high, ARC_REGISTER_SIZE), | |
989 | phex (low, ARC_REGISTER_SIZE)); | |
ad0a504f AK |
990 | } |
991 | else | |
992 | error (_("arc_store_return_value: type length too large.")); | |
993 | } | |
994 | ||
aaf43c48 AK |
995 | /* Implement the "get_longjmp_target" gdbarch method. */ |
996 | ||
997 | static int | |
998 | arc_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) | |
999 | { | |
d8d1feb4 | 1000 | arc_debug_printf ("called"); |
aaf43c48 AK |
1001 | |
1002 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
1003 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1004 | int pc_offset = tdep->jb_pc * ARC_REGISTER_SIZE; | |
1005 | gdb_byte buf[ARC_REGISTER_SIZE]; | |
1006 | CORE_ADDR jb_addr = get_frame_register_unsigned (frame, ARC_FIRST_ARG_REGNUM); | |
1007 | ||
1008 | if (target_read_memory (jb_addr + pc_offset, buf, ARC_REGISTER_SIZE)) | |
1009 | return 0; /* Failed to read from memory. */ | |
1010 | ||
1011 | *pc = extract_unsigned_integer (buf, ARC_REGISTER_SIZE, | |
1012 | gdbarch_byte_order (gdbarch)); | |
1013 | return 1; | |
1014 | } | |
1015 | ||
ad0a504f AK |
1016 | /* Implement the "return_value" gdbarch method. */ |
1017 | ||
1018 | static enum return_value_convention | |
1019 | arc_return_value (struct gdbarch *gdbarch, struct value *function, | |
1020 | struct type *valtype, struct regcache *regcache, | |
1021 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
1022 | { | |
1023 | /* If the return type is a struct, or a union, or would occupy more than two | |
1024 | registers, the ABI uses the "struct return convention": the calling | |
1025 | function passes a hidden first parameter to the callee (in R0). That | |
1026 | parameter is the address at which the value being returned should be | |
1027 | stored. Otherwise, the result is returned in registers. */ | |
78134374 SM |
1028 | int is_struct_return = (valtype->code () == TYPE_CODE_STRUCT |
1029 | || valtype->code () == TYPE_CODE_UNION | |
ad0a504f AK |
1030 | || TYPE_LENGTH (valtype) > 2 * ARC_REGISTER_SIZE); |
1031 | ||
d8d1feb4 SM |
1032 | arc_debug_printf ("readbuf = %s, writebuf = %s", |
1033 | host_address_to_string (readbuf), | |
1034 | host_address_to_string (writebuf)); | |
ad0a504f AK |
1035 | |
1036 | if (writebuf != NULL) | |
1037 | { | |
1038 | /* Case 1. GDB should not ask us to set a struct return value: it | |
1039 | should know the struct return location and write the value there | |
1040 | itself. */ | |
1041 | gdb_assert (!is_struct_return); | |
1042 | arc_store_return_value (gdbarch, valtype, regcache, writebuf); | |
1043 | } | |
1044 | else if (readbuf != NULL) | |
1045 | { | |
1046 | /* Case 2. GDB should not ask us to get a struct return value: it | |
1047 | should know the struct return location and read the value from there | |
1048 | itself. */ | |
1049 | gdb_assert (!is_struct_return); | |
1050 | arc_extract_return_value (gdbarch, valtype, regcache, readbuf); | |
1051 | } | |
1052 | ||
1053 | return (is_struct_return | |
1054 | ? RETURN_VALUE_STRUCT_CONVENTION | |
1055 | : RETURN_VALUE_REGISTER_CONVENTION); | |
1056 | } | |
1057 | ||
1058 | /* Return the base address of the frame. For ARC, the base address is the | |
1059 | frame pointer. */ | |
1060 | ||
1061 | static CORE_ADDR | |
1062 | arc_frame_base_address (struct frame_info *this_frame, void **prologue_cache) | |
1063 | { | |
1064 | return (CORE_ADDR) get_frame_register_unsigned (this_frame, ARC_FP_REGNUM); | |
1065 | } | |
1066 | ||
fe5f7374 AK |
1067 | /* Helper function that returns valid pv_t for an instruction operand: |
1068 | either a register or a constant. */ | |
1069 | ||
1070 | static pv_t | |
1071 | arc_pv_get_operand (pv_t *regs, const struct arc_instruction &insn, int operand) | |
1072 | { | |
1073 | if (insn.operands[operand].kind == ARC_OPERAND_KIND_REG) | |
1074 | return regs[insn.operands[operand].value]; | |
1075 | else | |
1076 | return pv_constant (arc_insn_get_operand_value (insn, operand)); | |
1077 | } | |
1078 | ||
1079 | /* Determine whether the given disassembled instruction may be part of a | |
1080 | function prologue. If it is, the information in the frame unwind cache will | |
1081 | be updated. */ | |
1082 | ||
1083 | static bool | |
1084 | arc_is_in_prologue (struct gdbarch *gdbarch, const struct arc_instruction &insn, | |
1085 | pv_t *regs, struct pv_area *stack) | |
1086 | { | |
1087 | /* It might be that currently analyzed address doesn't contain an | |
1088 | instruction, hence INSN is not valid. It likely means that address points | |
1089 | to a data, non-initialized memory, or middle of a 32-bit instruction. In | |
1090 | practice this may happen if GDB connects to a remote target that has | |
1091 | non-zeroed memory. GDB would read PC value and would try to analyze | |
1092 | prologue, but there is no guarantee that memory contents at the address | |
1093 | specified in PC is address is a valid instruction. There is not much that | |
1094 | that can be done about that. */ | |
1095 | if (!insn.valid) | |
1096 | return false; | |
1097 | ||
1098 | /* Branch/jump or a predicated instruction. */ | |
1099 | if (insn.is_control_flow || insn.condition_code != ARC_CC_AL) | |
1100 | return false; | |
1101 | ||
1102 | /* Store of some register. May or may not update base address register. */ | |
1103 | if (insn.insn_class == STORE || insn.insn_class == PUSH) | |
1104 | { | |
30baf67b | 1105 | /* There is definitely at least one operand - register/value being |
fe5f7374 AK |
1106 | stored. */ |
1107 | gdb_assert (insn.operands_count > 0); | |
1108 | ||
1109 | /* Store at some constant address. */ | |
1110 | if (insn.operands_count > 1 | |
1111 | && insn.operands[1].kind != ARC_OPERAND_KIND_REG) | |
1112 | return false; | |
1113 | ||
1114 | /* Writeback modes: | |
1115 | Mode Address used Writeback value | |
1116 | -------------------------------------------------- | |
1117 | No reg + offset no | |
1118 | A/AW reg + offset reg + offset | |
1119 | AB reg reg + offset | |
1120 | AS reg + (offset << scaling) no | |
1121 | ||
1122 | "PUSH reg" is an alias to "ST.AW reg, [SP, -4]" encoding. However | |
1123 | 16-bit PUSH_S is a distinct instruction encoding, where offset and | |
1124 | base register are implied through opcode. */ | |
1125 | ||
1126 | /* Register with base memory address. */ | |
1127 | int base_reg = arc_insn_get_memory_base_reg (insn); | |
1128 | ||
1129 | /* Address where to write. arc_insn_get_memory_offset returns scaled | |
1130 | value for ARC_WRITEBACK_AS. */ | |
1131 | pv_t addr; | |
1132 | if (insn.writeback_mode == ARC_WRITEBACK_AB) | |
1133 | addr = regs[base_reg]; | |
1134 | else | |
1135 | addr = pv_add_constant (regs[base_reg], | |
1136 | arc_insn_get_memory_offset (insn)); | |
1137 | ||
f7b7ed97 | 1138 | if (stack->store_would_trash (addr)) |
fe5f7374 AK |
1139 | return false; |
1140 | ||
1141 | if (insn.data_size_mode != ARC_SCALING_D) | |
1142 | { | |
1143 | /* Find the value being stored. */ | |
1144 | pv_t store_value = arc_pv_get_operand (regs, insn, 0); | |
1145 | ||
1146 | /* What is the size of a the stored value? */ | |
1147 | CORE_ADDR size; | |
1148 | if (insn.data_size_mode == ARC_SCALING_B) | |
1149 | size = 1; | |
1150 | else if (insn.data_size_mode == ARC_SCALING_H) | |
1151 | size = 2; | |
1152 | else | |
1153 | size = ARC_REGISTER_SIZE; | |
1154 | ||
f7b7ed97 | 1155 | stack->store (addr, size, store_value); |
fe5f7374 AK |
1156 | } |
1157 | else | |
1158 | { | |
1159 | if (insn.operands[0].kind == ARC_OPERAND_KIND_REG) | |
1160 | { | |
1161 | /* If this is a double store, than write N+1 register as well. */ | |
1162 | pv_t store_value1 = regs[insn.operands[0].value]; | |
1163 | pv_t store_value2 = regs[insn.operands[0].value + 1]; | |
f7b7ed97 TT |
1164 | stack->store (addr, ARC_REGISTER_SIZE, store_value1); |
1165 | stack->store (pv_add_constant (addr, ARC_REGISTER_SIZE), | |
1166 | ARC_REGISTER_SIZE, store_value2); | |
fe5f7374 AK |
1167 | } |
1168 | else | |
1169 | { | |
1170 | pv_t store_value | |
1171 | = pv_constant (arc_insn_get_operand_value (insn, 0)); | |
f7b7ed97 | 1172 | stack->store (addr, ARC_REGISTER_SIZE * 2, store_value); |
fe5f7374 AK |
1173 | } |
1174 | } | |
1175 | ||
1176 | /* Is base register updated? */ | |
1177 | if (insn.writeback_mode == ARC_WRITEBACK_A | |
1178 | || insn.writeback_mode == ARC_WRITEBACK_AB) | |
1179 | regs[base_reg] = pv_add_constant (regs[base_reg], | |
1180 | arc_insn_get_memory_offset (insn)); | |
1181 | ||
1182 | return true; | |
1183 | } | |
1184 | else if (insn.insn_class == MOVE) | |
1185 | { | |
1186 | gdb_assert (insn.operands_count == 2); | |
1187 | ||
1188 | /* Destination argument can be "0", so nothing will happen. */ | |
1189 | if (insn.operands[0].kind == ARC_OPERAND_KIND_REG) | |
1190 | { | |
1191 | int dst_regnum = insn.operands[0].value; | |
1192 | regs[dst_regnum] = arc_pv_get_operand (regs, insn, 1); | |
1193 | } | |
1194 | return true; | |
1195 | } | |
1196 | else if (insn.insn_class == SUB) | |
1197 | { | |
1198 | gdb_assert (insn.operands_count == 3); | |
1199 | ||
1200 | /* SUB 0,b,c. */ | |
1201 | if (insn.operands[0].kind != ARC_OPERAND_KIND_REG) | |
1202 | return true; | |
1203 | ||
1204 | int dst_regnum = insn.operands[0].value; | |
1205 | regs[dst_regnum] = pv_subtract (arc_pv_get_operand (regs, insn, 1), | |
1206 | arc_pv_get_operand (regs, insn, 2)); | |
1207 | return true; | |
1208 | } | |
1209 | else if (insn.insn_class == ENTER) | |
1210 | { | |
1211 | /* ENTER_S is a prologue-in-instruction - it saves all callee-saved | |
1212 | registers according to given arguments thus greatly reducing code | |
1213 | size. Which registers will be actually saved depends on arguments. | |
1214 | ||
1215 | ENTER_S {R13-...,FP,BLINK} stores registers in following order: | |
1216 | ||
1217 | new SP -> | |
1218 | BLINK | |
1219 | R13 | |
1220 | R14 | |
1221 | R15 | |
1222 | ... | |
1223 | FP | |
1224 | old SP -> | |
1225 | ||
1226 | There are up to three arguments for this opcode, as presented by ARC | |
1227 | disassembler: | |
1228 | 1) amount of general-purpose registers to be saved - this argument is | |
1229 | always present even when it is 0; | |
1230 | 2) FP register number (27) if FP has to be stored, otherwise argument | |
1231 | is not present; | |
1232 | 3) BLINK register number (31) if BLINK has to be stored, otherwise | |
1233 | argument is not present. If both FP and BLINK are stored, then FP | |
1234 | is present before BLINK in argument list. */ | |
1235 | gdb_assert (insn.operands_count > 0); | |
1236 | ||
1237 | int regs_saved = arc_insn_get_operand_value (insn, 0); | |
1238 | ||
1239 | bool is_fp_saved; | |
1240 | if (insn.operands_count > 1) | |
1241 | is_fp_saved = (insn.operands[1].value == ARC_FP_REGNUM); | |
1242 | else | |
1243 | is_fp_saved = false; | |
1244 | ||
1245 | bool is_blink_saved; | |
1246 | if (insn.operands_count > 1) | |
1247 | is_blink_saved = (insn.operands[insn.operands_count - 1].value | |
1248 | == ARC_BLINK_REGNUM); | |
1249 | else | |
1250 | is_blink_saved = false; | |
1251 | ||
1252 | /* Amount of bytes to be allocated to store specified registers. */ | |
1253 | CORE_ADDR st_size = ((regs_saved + is_fp_saved + is_blink_saved) | |
1254 | * ARC_REGISTER_SIZE); | |
1255 | pv_t new_sp = pv_add_constant (regs[ARC_SP_REGNUM], -st_size); | |
1256 | ||
1257 | /* Assume that if the last register (closest to new SP) can be written, | |
1258 | then it is possible to write all of them. */ | |
f7b7ed97 | 1259 | if (stack->store_would_trash (new_sp)) |
fe5f7374 AK |
1260 | return false; |
1261 | ||
1262 | /* Current store address. */ | |
1263 | pv_t addr = regs[ARC_SP_REGNUM]; | |
1264 | ||
1265 | if (is_fp_saved) | |
1266 | { | |
1267 | addr = pv_add_constant (addr, -ARC_REGISTER_SIZE); | |
f7b7ed97 | 1268 | stack->store (addr, ARC_REGISTER_SIZE, regs[ARC_FP_REGNUM]); |
fe5f7374 AK |
1269 | } |
1270 | ||
1271 | /* Registers are stored in backward order: from GP (R26) to R13. */ | |
1272 | for (int i = ARC_R13_REGNUM + regs_saved - 1; i >= ARC_R13_REGNUM; i--) | |
1273 | { | |
1274 | addr = pv_add_constant (addr, -ARC_REGISTER_SIZE); | |
f7b7ed97 | 1275 | stack->store (addr, ARC_REGISTER_SIZE, regs[i]); |
fe5f7374 AK |
1276 | } |
1277 | ||
1278 | if (is_blink_saved) | |
1279 | { | |
1280 | addr = pv_add_constant (addr, -ARC_REGISTER_SIZE); | |
f7b7ed97 TT |
1281 | stack->store (addr, ARC_REGISTER_SIZE, |
1282 | regs[ARC_BLINK_REGNUM]); | |
fe5f7374 AK |
1283 | } |
1284 | ||
1285 | gdb_assert (pv_is_identical (addr, new_sp)); | |
1286 | ||
1287 | regs[ARC_SP_REGNUM] = new_sp; | |
1288 | ||
1289 | if (is_fp_saved) | |
1290 | regs[ARC_FP_REGNUM] = regs[ARC_SP_REGNUM]; | |
1291 | ||
1292 | return true; | |
1293 | } | |
1294 | ||
1295 | /* Some other architectures, like nds32 or arm, try to continue as far as | |
1296 | possible when building a prologue cache (as opposed to when skipping | |
1297 | prologue), so that cache will be as full as possible. However current | |
1298 | code for ARC doesn't recognize some instructions that may modify SP, like | |
1299 | ADD, AND, OR, etc, hence there is no way to guarantee that SP wasn't | |
1300 | clobbered by the skipped instruction. Potential existence of extension | |
1301 | instruction, which may do anything they want makes this even more complex, | |
1302 | so it is just better to halt on a first unrecognized instruction. */ | |
1303 | ||
1304 | return false; | |
1305 | } | |
1306 | ||
eea78757 AK |
1307 | /* Copy of gdb_buffered_insn_length_fprintf from disasm.c. */ |
1308 | ||
1309 | static int ATTRIBUTE_PRINTF (2, 3) | |
1310 | arc_fprintf_disasm (void *stream, const char *format, ...) | |
1311 | { | |
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | struct disassemble_info | |
1316 | arc_disassemble_info (struct gdbarch *gdbarch) | |
1317 | { | |
1318 | struct disassemble_info di; | |
1319 | init_disassemble_info (&di, &null_stream, arc_fprintf_disasm); | |
1320 | di.arch = gdbarch_bfd_arch_info (gdbarch)->arch; | |
1321 | di.mach = gdbarch_bfd_arch_info (gdbarch)->mach; | |
1322 | di.endian = gdbarch_byte_order (gdbarch); | |
1323 | di.read_memory_func = [](bfd_vma memaddr, gdb_byte *myaddr, | |
1324 | unsigned int len, struct disassemble_info *info) | |
1325 | { | |
1326 | return target_read_code (memaddr, myaddr, len); | |
1327 | }; | |
1328 | return di; | |
1329 | } | |
1330 | ||
fe5f7374 AK |
1331 | /* Analyze the prologue and update the corresponding frame cache for the frame |
1332 | unwinder for unwinding frames that doesn't have debug info. In such | |
1333 | situation GDB attempts to parse instructions in the prologue to understand | |
1334 | where each register is saved. | |
1335 | ||
1336 | If CACHE is not NULL, then it will be filled with information about saved | |
1337 | registers. | |
1338 | ||
85102364 | 1339 | There are several variations of prologue which GDB may encounter. "Full" |
fe5f7374 AK |
1340 | prologue looks like this: |
1341 | ||
1342 | sub sp,sp,<imm> ; Space for variadic arguments. | |
1343 | push blink ; Store return address. | |
1344 | push r13 ; Store callee saved registers (up to R26/GP). | |
1345 | push r14 | |
1346 | push fp ; Store frame pointer. | |
1347 | mov fp,sp ; Update frame pointer. | |
1348 | sub sp,sp,<imm> ; Create space for local vars on the stack. | |
1349 | ||
1350 | Depending on compiler options lots of things may change: | |
1351 | ||
1352 | 1) BLINK is not saved in leaf functions. | |
1353 | 2) Frame pointer is not saved and updated if -fomit-frame-pointer is used. | |
1354 | 3) 16-bit versions of those instructions may be used. | |
1355 | 4) Instead of a sequence of several push'es, compiler may instead prefer to | |
1356 | do one subtract on stack pointer and then store registers using normal | |
1357 | store, that doesn't update SP. Like this: | |
1358 | ||
1359 | ||
85102364 | 1360 | sub sp,sp,8 ; Create space for callee-saved registers. |
fe5f7374 AK |
1361 | st r13,[sp,4] ; Store callee saved registers (up to R26/GP). |
1362 | st r14,[sp,0] | |
1363 | ||
1364 | 5) ENTER_S instruction can encode most of prologue sequence in one | |
1365 | instruction (except for those subtracts for variadic arguments and local | |
1366 | variables). | |
1367 | 6) GCC may use "millicode" functions from libgcc to store callee-saved | |
1368 | registers with minimal code-size requirements. This function currently | |
1369 | doesn't support this. | |
1370 | ||
1371 | ENTRYPOINT is a function entry point where prologue starts. | |
1372 | ||
1373 | LIMIT_PC is a maximum possible end address of prologue (meaning address | |
1374 | of first instruction after the prologue). It might also point to the middle | |
1375 | of prologue if execution has been stopped by the breakpoint at this address | |
1376 | - in this case debugger should analyze prologue only up to this address, | |
1377 | because further instructions haven't been executed yet. | |
1378 | ||
1379 | Returns address of the first instruction after the prologue. */ | |
1380 | ||
1381 | static CORE_ADDR | |
1382 | arc_analyze_prologue (struct gdbarch *gdbarch, const CORE_ADDR entrypoint, | |
1383 | const CORE_ADDR limit_pc, struct arc_frame_cache *cache) | |
1384 | { | |
d8d1feb4 SM |
1385 | arc_debug_printf ("entrypoint=%s, limit_pc=%s", |
1386 | paddress (gdbarch, entrypoint), | |
1387 | paddress (gdbarch, limit_pc)); | |
fe5f7374 AK |
1388 | |
1389 | /* Prologue values. Only core registers can be stored. */ | |
1390 | pv_t regs[ARC_LAST_CORE_REGNUM + 1]; | |
1391 | for (int i = 0; i <= ARC_LAST_CORE_REGNUM; i++) | |
1392 | regs[i] = pv_register (i, 0); | |
f7b7ed97 | 1393 | pv_area stack (ARC_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
fe5f7374 AK |
1394 | |
1395 | CORE_ADDR current_prologue_end = entrypoint; | |
1396 | ||
1397 | /* Look at each instruction in the prologue. */ | |
1398 | while (current_prologue_end < limit_pc) | |
1399 | { | |
1400 | struct arc_instruction insn; | |
1401 | struct disassemble_info di = arc_disassemble_info (gdbarch); | |
1402 | arc_insn_decode (current_prologue_end, &di, arc_delayed_print_insn, | |
1403 | &insn); | |
1404 | ||
fb0f5031 | 1405 | if (arc_debug) |
fe5f7374 AK |
1406 | arc_insn_dump (insn); |
1407 | ||
1408 | /* If this instruction is in the prologue, fields in the cache will be | |
1409 | updated, and the saved registers mask may be updated. */ | |
f7b7ed97 | 1410 | if (!arc_is_in_prologue (gdbarch, insn, regs, &stack)) |
fe5f7374 AK |
1411 | { |
1412 | /* Found an instruction that is not in the prologue. */ | |
d8d1feb4 SM |
1413 | arc_debug_printf ("End of prologue reached at address %s", |
1414 | paddress (gdbarch, insn.address)); | |
fe5f7374 AK |
1415 | break; |
1416 | } | |
1417 | ||
1418 | current_prologue_end = arc_insn_get_linear_next_pc (insn); | |
1419 | } | |
1420 | ||
1421 | if (cache != NULL) | |
1422 | { | |
1423 | /* Figure out if it is a frame pointer or just a stack pointer. */ | |
1424 | if (pv_is_register (regs[ARC_FP_REGNUM], ARC_SP_REGNUM)) | |
1425 | { | |
1426 | cache->frame_base_reg = ARC_FP_REGNUM; | |
1427 | cache->frame_base_offset = -regs[ARC_FP_REGNUM].k; | |
1428 | } | |
1429 | else | |
1430 | { | |
1431 | cache->frame_base_reg = ARC_SP_REGNUM; | |
1432 | cache->frame_base_offset = -regs[ARC_SP_REGNUM].k; | |
1433 | } | |
1434 | ||
1435 | /* Assign offset from old SP to all saved registers. */ | |
1436 | for (int i = 0; i <= ARC_LAST_CORE_REGNUM; i++) | |
1437 | { | |
1438 | CORE_ADDR offset; | |
f7b7ed97 | 1439 | if (stack.find_reg (gdbarch, i, &offset)) |
098caef4 | 1440 | cache->saved_regs[i].set_addr (offset); |
fe5f7374 AK |
1441 | } |
1442 | } | |
1443 | ||
fe5f7374 AK |
1444 | return current_prologue_end; |
1445 | } | |
1446 | ||
1447 | /* Estimated maximum prologue length in bytes. This should include: | |
1448 | 1) Store instruction for each callee-saved register (R25 - R13 + 1) | |
1449 | 2) Two instructions for FP | |
1450 | 3) One for BLINK | |
1451 | 4) Three substract instructions for SP (for variadic args, for | |
1452 | callee saved regs and for local vars) and assuming that those SUB use | |
1453 | long-immediate (hence double length). | |
1454 | 5) Stores of arguments registers are considered part of prologue too | |
1455 | (R7 - R1 + 1). | |
1456 | This is quite an extreme case, because even with -O0 GCC will collapse first | |
1457 | two SUBs into one and long immediate values are quite unlikely to appear in | |
1458 | this case, but still better to overshoot a bit - prologue analysis will | |
1459 | anyway stop at the first instruction that doesn't fit prologue, so this | |
1460 | limit will be rarely reached. */ | |
1461 | ||
1462 | const static int MAX_PROLOGUE_LENGTH | |
1463 | = 4 * (ARC_R25_REGNUM - ARC_R13_REGNUM + 1 + 2 + 1 + 6 | |
1464 | + ARC_LAST_ARG_REGNUM - ARC_FIRST_ARG_REGNUM + 1); | |
1465 | ||
ad0a504f AK |
1466 | /* Implement the "skip_prologue" gdbarch method. |
1467 | ||
1468 | Skip the prologue for the function at PC. This is done by checking from | |
1469 | the line information read from the DWARF, if possible; otherwise, we scan | |
1470 | the function prologue to find its end. */ | |
1471 | ||
1472 | static CORE_ADDR | |
1473 | arc_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1474 | { | |
d8d1feb4 | 1475 | arc_debug_printf ("called"); |
ad0a504f AK |
1476 | |
1477 | CORE_ADDR func_addr; | |
1478 | const char *func_name; | |
1479 | ||
1480 | /* See what the symbol table says. */ | |
1481 | if (find_pc_partial_function (pc, &func_name, &func_addr, NULL)) | |
1482 | { | |
1483 | /* Found a function. */ | |
1484 | CORE_ADDR postprologue_pc | |
1485 | = skip_prologue_using_sal (gdbarch, func_addr); | |
1486 | ||
1487 | if (postprologue_pc != 0) | |
1488 | return std::max (pc, postprologue_pc); | |
1489 | } | |
1490 | ||
1491 | /* No prologue info in symbol table, have to analyze prologue. */ | |
1492 | ||
1493 | /* Find an upper limit on the function prologue using the debug | |
fe5f7374 AK |
1494 | information. If there is no debug information about prologue end, then |
1495 | skip_prologue_using_sal will return 0. */ | |
ad0a504f | 1496 | CORE_ADDR limit_pc = skip_prologue_using_sal (gdbarch, pc); |
fe5f7374 AK |
1497 | |
1498 | /* If there is no debug information at all, it is required to give some | |
1499 | semi-arbitrary hard limit on amount of bytes to scan during prologue | |
1500 | analysis. */ | |
1501 | if (limit_pc == 0) | |
1502 | limit_pc = pc + MAX_PROLOGUE_LENGTH; | |
1503 | ||
1504 | /* Find the address of the first instruction after the prologue by scanning | |
1505 | through it - no other information is needed, so pass NULL as a cache. */ | |
1506 | return arc_analyze_prologue (gdbarch, pc, limit_pc, NULL); | |
ad0a504f AK |
1507 | } |
1508 | ||
1509 | /* Implement the "print_insn" gdbarch method. | |
1510 | ||
1511 | arc_get_disassembler () may return different functions depending on bfd | |
1512 | type, so it is not possible to pass print_insn directly to | |
1513 | set_gdbarch_print_insn (). Instead this wrapper function is used. It also | |
1514 | may be used by other functions to get disassemble_info for address. It is | |
1515 | important to note, that those print_insn from opcodes always print | |
1516 | instruction to the stream specified in the INFO. If this is not desired, | |
1517 | then either `print_insn` function in INFO should be set to some function | |
1518 | that will not print, or `stream` should be different from standard | |
1519 | gdb_stdlog. */ | |
1520 | ||
eea78757 | 1521 | int |
ad0a504f AK |
1522 | arc_delayed_print_insn (bfd_vma addr, struct disassemble_info *info) |
1523 | { | |
85102364 | 1524 | /* Standard BFD "machine number" field allows libopcodes disassembler to |
a87dc45a AK |
1525 | distinguish ARC 600, 700 and v2 cores, however v2 encompasses both ARC EM |
1526 | and HS, which have some difference between. There are two ways to specify | |
1527 | what is the target core: | |
1528 | 1) via the disassemble_info->disassembler_options; | |
1529 | 2) otherwise libopcodes will use private (architecture-specific) ELF | |
1530 | header. | |
1531 | ||
1532 | Using disassembler_options is preferable, because it comes directly from | |
1533 | GDBserver which scanned an actual ARC core identification info. However, | |
1534 | not all GDBservers report core architecture, so as a fallback GDB still | |
1535 | should support analysis of ELF header. The libopcodes disassembly code | |
1536 | uses the section to find the BFD and the BFD to find the ELF header, | |
1537 | therefore this function should set disassemble_info->section properly. | |
1538 | ||
1539 | disassembler_options was already set by non-target specific code with | |
1540 | proper options obtained via gdbarch_disassembler_options (). | |
1541 | ||
1542 | This function might be called multiple times in a sequence, reusing same | |
1543 | disassemble_info. */ | |
1544 | if ((info->disassembler_options == NULL) && (info->section == NULL)) | |
1545 | { | |
1546 | struct obj_section *s = find_pc_section (addr); | |
1547 | if (s != NULL) | |
1548 | info->section = s->the_bfd_section; | |
1549 | } | |
1550 | ||
1551 | return default_print_insn (addr, info); | |
ad0a504f AK |
1552 | } |
1553 | ||
1554 | /* Baremetal breakpoint instructions. | |
1555 | ||
1556 | ARC supports both big- and little-endian. However, instructions for | |
1557 | little-endian processors are encoded in the middle-endian: half-words are | |
1558 | in big-endian, while bytes inside the half-words are in little-endian; data | |
1559 | is represented in the "normal" little-endian. Big-endian processors treat | |
1560 | data and code identically. | |
1561 | ||
1562 | Assuming the number 0x01020304, it will be presented this way: | |
1563 | ||
1564 | Address : N N+1 N+2 N+3 | |
1565 | little-endian : 0x04 0x03 0x02 0x01 | |
1566 | big-endian : 0x01 0x02 0x03 0x04 | |
1567 | ARC middle-endian : 0x02 0x01 0x04 0x03 | |
1568 | */ | |
1569 | ||
1570 | static const gdb_byte arc_brk_s_be[] = { 0x7f, 0xff }; | |
1571 | static const gdb_byte arc_brk_s_le[] = { 0xff, 0x7f }; | |
1572 | static const gdb_byte arc_brk_be[] = { 0x25, 0x6f, 0x00, 0x3f }; | |
1573 | static const gdb_byte arc_brk_le[] = { 0x6f, 0x25, 0x3f, 0x00 }; | |
1574 | ||
d19280ad | 1575 | /* For ARC ELF, breakpoint uses the 16-bit BRK_S instruction, which is 0x7fff |
ad0a504f AK |
1576 | (little endian) or 0xff7f (big endian). We used to insert BRK_S even |
1577 | instead of 32-bit instructions, which works mostly ok, unless breakpoint is | |
1578 | inserted into delay slot instruction. In this case if branch is taken | |
1579 | BLINK value will be set to address of instruction after delay slot, however | |
1580 | if we replaced 32-bit instruction in delay slot with 16-bit long BRK_S, | |
1581 | then BLINK value will have an invalid value - it will point to the address | |
1582 | after the BRK_S (which was there at the moment of branch execution) while | |
1583 | it should point to the address after the 32-bit long instruction. To avoid | |
1584 | such issues this function disassembles instruction at target location and | |
1585 | evaluates it value. | |
1586 | ||
1587 | ARC 600 supports only 16-bit BRK_S. | |
1588 | ||
1589 | NB: Baremetal GDB uses BRK[_S], while user-space GDB uses TRAP_S. BRK[_S] | |
1590 | is much better because it doesn't commit unlike TRAP_S, so it can be set in | |
1591 | delay slots; however it cannot be used in user-mode, hence usage of TRAP_S | |
d19280ad | 1592 | in GDB for user-space. */ |
ad0a504f | 1593 | |
d19280ad | 1594 | /* Implement the "breakpoint_kind_from_pc" gdbarch method. */ |
ad0a504f | 1595 | |
d19280ad YQ |
1596 | static int |
1597 | arc_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr) | |
ad0a504f AK |
1598 | { |
1599 | size_t length_with_limm = gdb_insn_length (gdbarch, *pcptr); | |
1600 | ||
1601 | /* Replace 16-bit instruction with BRK_S, replace 32-bit instructions with | |
1602 | BRK. LIMM is part of instruction length, so it can be either 4 or 8 | |
1603 | bytes for 32-bit instructions. */ | |
1604 | if ((length_with_limm == 4 || length_with_limm == 8) | |
1605 | && !arc_mach_is_arc600 (gdbarch)) | |
d19280ad YQ |
1606 | return sizeof (arc_brk_le); |
1607 | else | |
1608 | return sizeof (arc_brk_s_le); | |
1609 | } | |
1610 | ||
1611 | /* Implement the "sw_breakpoint_from_kind" gdbarch method. */ | |
1612 | ||
1613 | static const gdb_byte * | |
1614 | arc_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size) | |
1615 | { | |
6f2643db | 1616 | gdb_assert (kind == 2 || kind == 4); |
d19280ad YQ |
1617 | *size = kind; |
1618 | ||
1619 | if (kind == sizeof (arc_brk_le)) | |
ad0a504f | 1620 | { |
ad0a504f AK |
1621 | return ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
1622 | ? arc_brk_be | |
1623 | : arc_brk_le); | |
1624 | } | |
1625 | else | |
1626 | { | |
ad0a504f AK |
1627 | return ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
1628 | ? arc_brk_s_be | |
1629 | : arc_brk_s_le); | |
1630 | } | |
1631 | } | |
1632 | ||
ad0a504f AK |
1633 | /* Implement the "frame_align" gdbarch method. */ |
1634 | ||
1635 | static CORE_ADDR | |
1636 | arc_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
1637 | { | |
1638 | return align_down (sp, 4); | |
1639 | } | |
1640 | ||
fe5f7374 AK |
1641 | /* Dump the frame info. Used for internal debugging only. */ |
1642 | ||
1643 | static void | |
a121b7c1 | 1644 | arc_print_frame_cache (struct gdbarch *gdbarch, const char *message, |
fe5f7374 AK |
1645 | struct arc_frame_cache *cache, int addresses_known) |
1646 | { | |
d8d1feb4 SM |
1647 | arc_debug_printf ("frame_info %s", message); |
1648 | arc_debug_printf ("prev_sp = %s", paddress (gdbarch, cache->prev_sp)); | |
1649 | arc_debug_printf ("frame_base_reg = %i", cache->frame_base_reg); | |
1650 | arc_debug_printf ("frame_base_offset = %s", | |
1651 | plongest (cache->frame_base_offset)); | |
fe5f7374 AK |
1652 | |
1653 | for (int i = 0; i <= ARC_BLINK_REGNUM; i++) | |
1654 | { | |
a9a87d35 | 1655 | if (cache->saved_regs[i].is_addr ()) |
d8d1feb4 SM |
1656 | arc_debug_printf ("saved register %s at %s %s", |
1657 | gdbarch_register_name (gdbarch, i), | |
1658 | (addresses_known) ? "address" : "offset", | |
1659 | paddress (gdbarch, cache->saved_regs[i].addr ())); | |
fe5f7374 AK |
1660 | } |
1661 | } | |
1662 | ||
ad0a504f AK |
1663 | /* Frame unwinder for normal frames. */ |
1664 | ||
1665 | static struct arc_frame_cache * | |
1666 | arc_make_frame_cache (struct frame_info *this_frame) | |
1667 | { | |
d8d1feb4 | 1668 | arc_debug_printf ("called"); |
ad0a504f AK |
1669 | |
1670 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1671 | ||
1672 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
ad0a504f AK |
1673 | CORE_ADDR entrypoint, prologue_end; |
1674 | if (find_pc_partial_function (block_addr, NULL, &entrypoint, &prologue_end)) | |
1675 | { | |
1676 | struct symtab_and_line sal = find_pc_line (entrypoint, 0); | |
fe5f7374 | 1677 | CORE_ADDR prev_pc = get_frame_pc (this_frame); |
ad0a504f AK |
1678 | if (sal.line == 0) |
1679 | /* No line info so use current PC. */ | |
1680 | prologue_end = prev_pc; | |
1681 | else if (sal.end < prologue_end) | |
1682 | /* The next line begins after the function end. */ | |
1683 | prologue_end = sal.end; | |
1684 | ||
1685 | prologue_end = std::min (prologue_end, prev_pc); | |
1686 | } | |
1687 | else | |
1688 | { | |
fe5f7374 AK |
1689 | /* If find_pc_partial_function returned nothing then there is no symbol |
1690 | information at all for this PC. Currently it is assumed in this case | |
1691 | that current PC is entrypoint to function and try to construct the | |
1692 | frame from that. This is, probably, suboptimal, for example ARM | |
1693 | assumes in this case that program is inside the normal frame (with | |
1694 | frame pointer). ARC, perhaps, should try to do the same. */ | |
ad0a504f AK |
1695 | entrypoint = get_frame_register_unsigned (this_frame, |
1696 | gdbarch_pc_regnum (gdbarch)); | |
fe5f7374 | 1697 | prologue_end = entrypoint + MAX_PROLOGUE_LENGTH; |
ad0a504f AK |
1698 | } |
1699 | ||
1700 | /* Allocate new frame cache instance and space for saved register info. | |
fe5f7374 | 1701 | FRAME_OBSTACK_ZALLOC will initialize fields to zeroes. */ |
ad0a504f AK |
1702 | struct arc_frame_cache *cache |
1703 | = FRAME_OBSTACK_ZALLOC (struct arc_frame_cache); | |
1704 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
1705 | ||
fe5f7374 AK |
1706 | arc_analyze_prologue (gdbarch, entrypoint, prologue_end, cache); |
1707 | ||
1708 | if (arc_debug) | |
1709 | arc_print_frame_cache (gdbarch, "after prologue", cache, false); | |
1710 | ||
1711 | CORE_ADDR unwound_fb = get_frame_register_unsigned (this_frame, | |
1712 | cache->frame_base_reg); | |
1713 | if (unwound_fb == 0) | |
1714 | return cache; | |
1715 | cache->prev_sp = unwound_fb + cache->frame_base_offset; | |
1716 | ||
1717 | for (int i = 0; i <= ARC_LAST_CORE_REGNUM; i++) | |
1718 | { | |
a9a87d35 | 1719 | if (cache->saved_regs[i].is_addr ()) |
098caef4 LM |
1720 | cache->saved_regs[i].set_addr (cache->saved_regs[i].addr () |
1721 | + cache->prev_sp); | |
fe5f7374 AK |
1722 | } |
1723 | ||
1724 | if (arc_debug) | |
1725 | arc_print_frame_cache (gdbarch, "after previous SP found", cache, true); | |
ad0a504f AK |
1726 | |
1727 | return cache; | |
1728 | } | |
1729 | ||
1730 | /* Implement the "this_id" frame_unwind method. */ | |
1731 | ||
1732 | static void | |
1733 | arc_frame_this_id (struct frame_info *this_frame, void **this_cache, | |
1734 | struct frame_id *this_id) | |
1735 | { | |
d8d1feb4 | 1736 | arc_debug_printf ("called"); |
ad0a504f AK |
1737 | |
1738 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1739 | ||
1740 | if (*this_cache == NULL) | |
1741 | *this_cache = arc_make_frame_cache (this_frame); | |
1742 | struct arc_frame_cache *cache = (struct arc_frame_cache *) (*this_cache); | |
1743 | ||
1744 | CORE_ADDR stack_addr = cache->prev_sp; | |
1745 | ||
1746 | /* There are 4 possible situation which decide how frame_id->code_addr is | |
1747 | evaluated: | |
1748 | ||
1749 | 1) Function is compiled with option -g. Then frame_id will be created | |
1750 | in dwarf_* function and not in this function. NB: even if target | |
1751 | binary is compiled with -g, some std functions like __start and _init | |
1752 | are not, so they still will follow one of the following choices. | |
1753 | ||
1754 | 2) Function is compiled without -g and binary hasn't been stripped in | |
1755 | any way. In this case GDB still has enough information to evaluate | |
1756 | frame code_addr properly. This case is covered by call to | |
1757 | get_frame_func (). | |
1758 | ||
1759 | 3) Binary has been striped with option -g (strip debug symbols). In | |
1760 | this case there is still enough symbols for get_frame_func () to work | |
1761 | properly, so this case is also covered by it. | |
1762 | ||
1763 | 4) Binary has been striped with option -s (strip all symbols). In this | |
1764 | case GDB cannot get function start address properly, so we return current | |
1765 | PC value instead. | |
1766 | */ | |
1767 | CORE_ADDR code_addr = get_frame_func (this_frame); | |
1768 | if (code_addr == 0) | |
1769 | code_addr = get_frame_register_unsigned (this_frame, | |
1770 | gdbarch_pc_regnum (gdbarch)); | |
1771 | ||
1772 | *this_id = frame_id_build (stack_addr, code_addr); | |
1773 | } | |
1774 | ||
1775 | /* Implement the "prev_register" frame_unwind method. */ | |
1776 | ||
1777 | static struct value * | |
1778 | arc_frame_prev_register (struct frame_info *this_frame, | |
1779 | void **this_cache, int regnum) | |
1780 | { | |
ad0a504f AK |
1781 | if (*this_cache == NULL) |
1782 | *this_cache = arc_make_frame_cache (this_frame); | |
1783 | struct arc_frame_cache *cache = (struct arc_frame_cache *) (*this_cache); | |
1784 | ||
1785 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1786 | ||
1787 | /* If we are asked to unwind the PC, then we need to return BLINK instead: | |
1788 | the saved value of PC points into this frame's function's prologue, not | |
1789 | the next frame's function's resume location. */ | |
1790 | if (regnum == gdbarch_pc_regnum (gdbarch)) | |
1791 | regnum = ARC_BLINK_REGNUM; | |
1792 | ||
1793 | /* SP is a special case - we should return prev_sp, because | |
1794 | trad_frame_get_prev_register will return _current_ SP value. | |
1795 | Alternatively we could have stored cache->prev_sp in the cache->saved | |
1796 | regs, but here we follow the lead of AArch64, ARM and Xtensa and will | |
1797 | leave that logic in this function, instead of prologue analyzers. That I | |
1798 | think is a bit more clear as `saved_regs` should contain saved regs, not | |
1799 | computable. | |
1800 | ||
1801 | Because value has been computed, "got_constant" should be used, so that | |
1802 | returned value will be a "not_lval" - immutable. */ | |
1803 | ||
1804 | if (regnum == gdbarch_sp_regnum (gdbarch)) | |
1805 | return frame_unwind_got_constant (this_frame, regnum, cache->prev_sp); | |
1806 | ||
1807 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum); | |
1808 | } | |
1809 | ||
1810 | /* Implement the "init_reg" dwarf2_frame method. */ | |
1811 | ||
1812 | static void | |
1813 | arc_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
1814 | struct dwarf2_frame_state_reg *reg, | |
1815 | struct frame_info *info) | |
1816 | { | |
1817 | if (regnum == gdbarch_pc_regnum (gdbarch)) | |
1818 | /* The return address column. */ | |
1819 | reg->how = DWARF2_FRAME_REG_RA; | |
1820 | else if (regnum == gdbarch_sp_regnum (gdbarch)) | |
1821 | /* The call frame address. */ | |
1822 | reg->how = DWARF2_FRAME_REG_CFA; | |
1823 | } | |
1824 | ||
b4e3cd04 AK |
1825 | /* Signal trampoline frame unwinder. Allows frame unwinding to happen |
1826 | from within signal handlers. */ | |
1827 | ||
1828 | static struct arc_frame_cache * | |
1829 | arc_make_sigtramp_frame_cache (struct frame_info *this_frame) | |
1830 | { | |
d8d1feb4 | 1831 | arc_debug_printf ("called"); |
b4e3cd04 AK |
1832 | |
1833 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (this_frame)); | |
1834 | ||
1835 | /* Allocate new frame cache instance and space for saved register info. */ | |
1836 | struct arc_frame_cache *cache = FRAME_OBSTACK_ZALLOC (struct arc_frame_cache); | |
1837 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
1838 | ||
1839 | /* Get the stack pointer and use it as the frame base. */ | |
1840 | cache->prev_sp = arc_frame_base_address (this_frame, NULL); | |
1841 | ||
1842 | /* If the ARC-private target-dependent info doesn't have a table of | |
1843 | offsets of saved register contents within an OS signal context | |
1844 | structure, then there is nothing to analyze. */ | |
1845 | if (tdep->sc_reg_offset == NULL) | |
1846 | return cache; | |
1847 | ||
1848 | /* Find the address of the sigcontext structure. */ | |
1849 | CORE_ADDR addr = tdep->sigcontext_addr (this_frame); | |
1850 | ||
1851 | /* For each register, if its contents have been saved within the | |
1852 | sigcontext structure, determine the address of those contents. */ | |
1853 | gdb_assert (tdep->sc_num_regs <= (ARC_LAST_REGNUM + 1)); | |
1854 | for (int i = 0; i < tdep->sc_num_regs; i++) | |
1855 | { | |
1856 | if (tdep->sc_reg_offset[i] != ARC_OFFSET_NO_REGISTER) | |
098caef4 | 1857 | cache->saved_regs[i].set_addr (addr + tdep->sc_reg_offset[i]); |
b4e3cd04 AK |
1858 | } |
1859 | ||
1860 | return cache; | |
1861 | } | |
1862 | ||
1863 | /* Implement the "this_id" frame_unwind method for signal trampoline | |
1864 | frames. */ | |
1865 | ||
1866 | static void | |
1867 | arc_sigtramp_frame_this_id (struct frame_info *this_frame, | |
1868 | void **this_cache, struct frame_id *this_id) | |
1869 | { | |
d8d1feb4 | 1870 | arc_debug_printf ("called"); |
b4e3cd04 AK |
1871 | |
1872 | if (*this_cache == NULL) | |
1873 | *this_cache = arc_make_sigtramp_frame_cache (this_frame); | |
1874 | ||
1875 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1876 | struct arc_frame_cache *cache = (struct arc_frame_cache *) *this_cache; | |
1877 | CORE_ADDR stack_addr = cache->prev_sp; | |
1878 | CORE_ADDR code_addr | |
1879 | = get_frame_register_unsigned (this_frame, gdbarch_pc_regnum (gdbarch)); | |
1880 | *this_id = frame_id_build (stack_addr, code_addr); | |
1881 | } | |
1882 | ||
1883 | /* Get a register from a signal handler frame. */ | |
1884 | ||
1885 | static struct value * | |
1886 | arc_sigtramp_frame_prev_register (struct frame_info *this_frame, | |
1887 | void **this_cache, int regnum) | |
1888 | { | |
d8d1feb4 | 1889 | arc_debug_printf ("regnum = %d", regnum); |
b4e3cd04 AK |
1890 | |
1891 | /* Make sure we've initialized the cache. */ | |
1892 | if (*this_cache == NULL) | |
1893 | *this_cache = arc_make_sigtramp_frame_cache (this_frame); | |
1894 | ||
1895 | struct arc_frame_cache *cache = (struct arc_frame_cache *) *this_cache; | |
1896 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum); | |
1897 | } | |
1898 | ||
1899 | /* Frame sniffer for signal handler frame. Only recognize a frame if we | |
1900 | have a sigcontext_addr handler in the target dependency. */ | |
1901 | ||
1902 | static int | |
1903 | arc_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
1904 | struct frame_info *this_frame, | |
1905 | void **this_cache) | |
1906 | { | |
1907 | struct gdbarch_tdep *tdep; | |
1908 | ||
d8d1feb4 | 1909 | arc_debug_printf ("called"); |
b4e3cd04 AK |
1910 | |
1911 | tdep = gdbarch_tdep (get_frame_arch (this_frame)); | |
1912 | ||
1913 | /* If we have a sigcontext_addr handler, then just return 1 (same as the | |
1914 | "default_frame_sniffer ()"). */ | |
1915 | return (tdep->sigcontext_addr != NULL && tdep->is_sigtramp != NULL | |
1916 | && tdep->is_sigtramp (this_frame)); | |
1917 | } | |
1918 | ||
ad0a504f AK |
1919 | /* Structure defining the ARC ordinary frame unwind functions. Since we are |
1920 | the fallback unwinder, we use the default frame sniffer, which always | |
1921 | accepts the frame. */ | |
1922 | ||
1923 | static const struct frame_unwind arc_frame_unwind = { | |
1924 | NORMAL_FRAME, | |
1925 | default_frame_unwind_stop_reason, | |
1926 | arc_frame_this_id, | |
1927 | arc_frame_prev_register, | |
1928 | NULL, | |
1929 | default_frame_sniffer, | |
1930 | NULL, | |
1931 | NULL | |
1932 | }; | |
1933 | ||
b4e3cd04 AK |
1934 | /* Structure defining the ARC signal frame unwind functions. Custom |
1935 | sniffer is used, because this frame must be accepted only in the right | |
1936 | context. */ | |
1937 | ||
1938 | static const struct frame_unwind arc_sigtramp_frame_unwind = { | |
1939 | SIGTRAMP_FRAME, | |
1940 | default_frame_unwind_stop_reason, | |
1941 | arc_sigtramp_frame_this_id, | |
1942 | arc_sigtramp_frame_prev_register, | |
1943 | NULL, | |
1944 | arc_sigtramp_frame_sniffer, | |
1945 | NULL, | |
1946 | NULL | |
1947 | }; | |
1948 | ||
ad0a504f AK |
1949 | |
1950 | static const struct frame_base arc_normal_base = { | |
1951 | &arc_frame_unwind, | |
1952 | arc_frame_base_address, | |
1953 | arc_frame_base_address, | |
1954 | arc_frame_base_address | |
1955 | }; | |
1956 | ||
995d3a19 SV |
1957 | static enum arc_isa |
1958 | mach_type_to_arc_isa (const unsigned long mach) | |
ad0a504f | 1959 | { |
995d3a19 SV |
1960 | switch (mach) |
1961 | { | |
1962 | case bfd_mach_arc_arc600: | |
1963 | case bfd_mach_arc_arc601: | |
1964 | case bfd_mach_arc_arc700: | |
1965 | return ARC_ISA_ARCV1; | |
1966 | case bfd_mach_arc_arcv2: | |
1967 | return ARC_ISA_ARCV2; | |
1968 | default: | |
1969 | internal_error (__FILE__, __LINE__, | |
1970 | _("unknown machine id %lu"), mach); | |
1971 | } | |
1972 | } | |
ad0a504f | 1973 | |
cc463201 | 1974 | /* See arc-tdep.h. */ |
ad0a504f | 1975 | |
cc463201 | 1976 | arc_arch_features |
e4bd363f | 1977 | arc_arch_features_create (const bfd *abfd, const unsigned long mach) |
995d3a19 SV |
1978 | { |
1979 | /* Use 4 as a fallback value. */ | |
1980 | int reg_size = 4; | |
1981 | ||
1982 | /* Try to guess the features parameters by looking at the binary to be | |
1983 | executed. If the user is providing a binary that does not match the | |
1984 | target, then tough luck. This is the last effort to makes sense of | |
1985 | what's going on. */ | |
1986 | if (abfd != nullptr && bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
ad0a504f | 1987 | { |
995d3a19 SV |
1988 | unsigned char eclass = elf_elfheader (abfd)->e_ident[EI_CLASS]; |
1989 | ||
1990 | if (eclass == ELFCLASS32) | |
1991 | reg_size = 4; | |
1992 | else if (eclass == ELFCLASS64) | |
1993 | reg_size = 8; | |
ad0a504f | 1994 | else |
995d3a19 SV |
1995 | internal_error (__FILE__, __LINE__, |
1996 | _("unknown ELF header class %d"), eclass); | |
ad0a504f | 1997 | } |
995d3a19 SV |
1998 | |
1999 | /* MACH from a bfd_arch_info struct is used here. It should be a safe | |
2000 | bet, as it looks like the struct is always initialized even when we | |
2001 | don't pass any elf file to GDB at all (it uses default arch in that | |
2002 | case). */ | |
2003 | arc_isa isa = mach_type_to_arc_isa (mach); | |
2004 | ||
e4bd363f | 2005 | return arc_arch_features (reg_size, isa); |
995d3a19 SV |
2006 | } |
2007 | ||
2008 | /* Look for obsolete core feature names in TDESC. */ | |
2009 | ||
2010 | static const struct tdesc_feature * | |
2011 | find_obsolete_core_names (const struct target_desc *tdesc) | |
2012 | { | |
2013 | const struct tdesc_feature *feat = nullptr; | |
2014 | ||
2015 | feat = tdesc_find_feature (tdesc, ARC_CORE_V1_OBSOLETE_FEATURE_NAME); | |
2016 | ||
2017 | if (feat == nullptr) | |
2018 | feat = tdesc_find_feature (tdesc, ARC_CORE_V2_OBSOLETE_FEATURE_NAME); | |
2019 | ||
2020 | if (feat == nullptr) | |
2021 | feat = tdesc_find_feature | |
2022 | (tdesc, ARC_CORE_V2_REDUCED_OBSOLETE_FEATURE_NAME); | |
2023 | ||
2024 | return feat; | |
2025 | } | |
2026 | ||
2027 | /* Look for obsolete aux feature names in TDESC. */ | |
2028 | ||
2029 | static const struct tdesc_feature * | |
2030 | find_obsolete_aux_names (const struct target_desc *tdesc) | |
2031 | { | |
2032 | return tdesc_find_feature (tdesc, ARC_AUX_OBSOLETE_FEATURE_NAME); | |
2033 | } | |
2034 | ||
2035 | /* Based on the MACH value, determines which core register features set | |
2036 | must be used. */ | |
2037 | ||
2038 | static arc_register_feature * | |
2039 | determine_core_reg_feature_set (const unsigned long mach) | |
2040 | { | |
2041 | switch (mach_type_to_arc_isa (mach)) | |
ad0a504f | 2042 | { |
995d3a19 SV |
2043 | case ARC_ISA_ARCV1: |
2044 | return &arc_v1_core_reg_feature; | |
2045 | case ARC_ISA_ARCV2: | |
2046 | return &arc_v2_core_reg_feature; | |
2047 | default: | |
2048 | gdb_assert_not_reached | |
dda83cd7 | 2049 | ("Unknown machine type to determine the core feature set."); |
ad0a504f | 2050 | } |
995d3a19 | 2051 | } |
ad0a504f | 2052 | |
995d3a19 SV |
2053 | /* At the moment, there is only 1 auxiliary register features set. |
2054 | This is a place holder for future extendability. */ | |
ad0a504f | 2055 | |
995d3a19 SV |
2056 | static const arc_register_feature * |
2057 | determine_aux_reg_feature_set () | |
2058 | { | |
2059 | return &arc_common_aux_reg_feature; | |
2060 | } | |
ad0a504f | 2061 | |
995d3a19 SV |
2062 | /* Update accumulator register names (ACCH/ACCL) for r58 and r59 in the |
2063 | register sets. The endianness determines the assignment: | |
ad0a504f | 2064 | |
dda83cd7 SM |
2065 | ,------.------. |
2066 | | acch | accl | | |
995d3a19 SV |
2067 | ,----|------+------| |
2068 | | LE | r59 | r58 | | |
2069 | | BE | r58 | r59 | | |
2070 | `----^------^------' */ | |
2071 | ||
2072 | static void | |
2073 | arc_update_acc_reg_names (const int byte_order) | |
2074 | { | |
2075 | const char *r58_alias | |
2076 | = byte_order == BFD_ENDIAN_LITTLE ? "accl" : "acch"; | |
2077 | const char *r59_alias | |
2078 | = byte_order == BFD_ENDIAN_LITTLE ? "acch" : "accl"; | |
2079 | ||
2080 | /* Subscript 1 must be OK because those registers have 2 names. */ | |
2081 | arc_v1_core_reg_feature.registers[ARC_R58_REGNUM].names[1] = r58_alias; | |
2082 | arc_v1_core_reg_feature.registers[ARC_R59_REGNUM].names[1] = r59_alias; | |
2083 | arc_v2_core_reg_feature.registers[ARC_R58_REGNUM].names[1] = r58_alias; | |
2084 | arc_v2_core_reg_feature.registers[ARC_R59_REGNUM].names[1] = r59_alias; | |
2085 | } | |
2086 | ||
2087 | /* Go through all the registers in REG_SET and check if they exist | |
2088 | in FEATURE. The TDESC_DATA is updated with the register number | |
2089 | in REG_SET if it is found in the feature. If a required register | |
2090 | is not found, this function returns false. */ | |
2091 | ||
2092 | static bool | |
2093 | arc_check_tdesc_feature (struct tdesc_arch_data *tdesc_data, | |
2094 | const struct tdesc_feature *feature, | |
2095 | const struct arc_register_feature *reg_set) | |
2096 | { | |
2097 | for (const auto ® : reg_set->registers) | |
ad0a504f | 2098 | { |
995d3a19 SV |
2099 | bool found = false; |
2100 | ||
2101 | for (const char *name : reg.names) | |
ad0a504f | 2102 | { |
995d3a19 SV |
2103 | found |
2104 | = tdesc_numbered_register (feature, tdesc_data, reg.regnum, name); | |
ad0a504f | 2105 | |
995d3a19 SV |
2106 | if (found) |
2107 | break; | |
ad0a504f | 2108 | } |
995d3a19 SV |
2109 | |
2110 | if (!found && reg.required_p) | |
ad0a504f | 2111 | { |
995d3a19 SV |
2112 | std::ostringstream reg_names; |
2113 | for (std::size_t i = 0; i < reg.names.size(); ++i) | |
ad0a504f | 2114 | { |
995d3a19 SV |
2115 | if (i == 0) |
2116 | reg_names << "'" << reg.names[0] << "'"; | |
2117 | else | |
2118 | reg_names << " or '" << reg.names[0] << "'"; | |
ad0a504f | 2119 | } |
995d3a19 SV |
2120 | arc_print (_("Error: Cannot find required register(s) %s " |
2121 | "in feature '%s'.\n"), reg_names.str ().c_str (), | |
2122 | feature->name.c_str ()); | |
2123 | return false; | |
ad0a504f AK |
2124 | } |
2125 | } | |
2126 | ||
995d3a19 SV |
2127 | return true; |
2128 | } | |
ad0a504f | 2129 | |
fdd8731b SV |
2130 | /* Check for the existance of "lp_start" and "lp_end" in target description. |
2131 | If both are present, assume there is hardware loop support in the target. | |
2132 | This can be improved by looking into "lpc_size" field of "isa_config" | |
2133 | auxiliary register. */ | |
2134 | ||
2135 | static bool | |
2136 | arc_check_for_hw_loops (const struct target_desc *tdesc, | |
2137 | struct tdesc_arch_data *data) | |
2138 | { | |
2139 | const auto feature_aux = tdesc_find_feature (tdesc, ARC_AUX_FEATURE_NAME); | |
2140 | const auto aux_regset = determine_aux_reg_feature_set (); | |
2141 | ||
2142 | if (feature_aux == nullptr) | |
2143 | return false; | |
2144 | ||
2145 | bool hw_loop_p = false; | |
2146 | const auto lp_start_name = | |
2147 | aux_regset->registers[ARC_LP_START_REGNUM - ARC_FIRST_AUX_REGNUM].names[0]; | |
2148 | const auto lp_end_name = | |
2149 | aux_regset->registers[ARC_LP_END_REGNUM - ARC_FIRST_AUX_REGNUM].names[0]; | |
2150 | ||
2151 | hw_loop_p = tdesc_numbered_register (feature_aux, data, | |
2152 | ARC_LP_START_REGNUM, lp_start_name); | |
2153 | hw_loop_p &= tdesc_numbered_register (feature_aux, data, | |
2154 | ARC_LP_END_REGNUM, lp_end_name); | |
2155 | ||
2156 | return hw_loop_p; | |
2157 | } | |
2158 | ||
995d3a19 | 2159 | /* Initialize target description for the ARC. |
ad0a504f | 2160 | |
995d3a19 SV |
2161 | Returns true if input TDESC was valid and in this case it will assign TDESC |
2162 | and TDESC_DATA output parameters. */ | |
2163 | ||
2164 | static bool | |
2165 | arc_tdesc_init (struct gdbarch_info info, const struct target_desc **tdesc, | |
c1e1314d | 2166 | tdesc_arch_data_up *tdesc_data) |
995d3a19 SV |
2167 | { |
2168 | const struct target_desc *tdesc_loc = info.target_desc; | |
d8d1feb4 | 2169 | arc_debug_printf ("Target description initialization."); |
995d3a19 SV |
2170 | |
2171 | /* If target doesn't provide a description, use the default ones. */ | |
2172 | if (!tdesc_has_registers (tdesc_loc)) | |
ad0a504f | 2173 | { |
e4bd363f SV |
2174 | arc_arch_features features |
2175 | = arc_arch_features_create (info.abfd, | |
2176 | info.bfd_arch_info->mach); | |
995d3a19 SV |
2177 | tdesc_loc = arc_lookup_target_description (features); |
2178 | } | |
2179 | gdb_assert (tdesc_loc != nullptr); | |
2180 | ||
d8d1feb4 | 2181 | arc_debug_printf ("Have got a target description"); |
995d3a19 SV |
2182 | |
2183 | const struct tdesc_feature *feature_core | |
2184 | = tdesc_find_feature (tdesc_loc, ARC_CORE_FEATURE_NAME); | |
2185 | const struct tdesc_feature *feature_aux | |
2186 | = tdesc_find_feature (tdesc_loc, ARC_AUX_FEATURE_NAME); | |
2187 | ||
2188 | /* Maybe there still is a chance to salvage the input. */ | |
2189 | if (feature_core == nullptr) | |
2190 | feature_core = find_obsolete_core_names (tdesc_loc); | |
2191 | if (feature_aux == nullptr) | |
2192 | feature_aux = find_obsolete_aux_names (tdesc_loc); | |
2193 | ||
2194 | if (feature_core == nullptr) | |
2195 | { | |
2196 | arc_print (_("Error: Cannot find required feature '%s' in supplied " | |
2197 | "target description.\n"), ARC_CORE_FEATURE_NAME); | |
2198 | return false; | |
ad0a504f AK |
2199 | } |
2200 | ||
995d3a19 | 2201 | if (feature_aux == nullptr) |
ad0a504f | 2202 | { |
995d3a19 SV |
2203 | arc_print (_("Error: Cannot find required feature '%s' in supplied " |
2204 | "target description.\n"), ARC_AUX_FEATURE_NAME); | |
fbdf05a1 | 2205 | return false; |
ad0a504f AK |
2206 | } |
2207 | ||
995d3a19 SV |
2208 | const arc_register_feature *arc_core_reg_feature |
2209 | = determine_core_reg_feature_set (info.bfd_arch_info->mach); | |
2210 | const arc_register_feature *arc_aux_reg_feature | |
2211 | = determine_aux_reg_feature_set (); | |
2212 | ||
c1e1314d | 2213 | tdesc_arch_data_up tdesc_data_loc = tdesc_data_alloc (); |
995d3a19 SV |
2214 | |
2215 | arc_update_acc_reg_names (info.byte_order); | |
2216 | ||
c1e1314d | 2217 | bool valid_p = arc_check_tdesc_feature (tdesc_data_loc.get (), |
995d3a19 SV |
2218 | feature_core, |
2219 | arc_core_reg_feature); | |
2220 | ||
c1e1314d | 2221 | valid_p &= arc_check_tdesc_feature (tdesc_data_loc.get (), |
995d3a19 SV |
2222 | feature_aux, |
2223 | arc_aux_reg_feature); | |
2224 | ||
2225 | if (!valid_p) | |
ad0a504f | 2226 | { |
d8d1feb4 | 2227 | arc_debug_printf ("Target description is not valid"); |
995d3a19 | 2228 | return false; |
ad0a504f AK |
2229 | } |
2230 | ||
2231 | *tdesc = tdesc_loc; | |
c1e1314d | 2232 | *tdesc_data = std::move (tdesc_data_loc); |
ad0a504f | 2233 | |
fbdf05a1 | 2234 | return true; |
ad0a504f AK |
2235 | } |
2236 | ||
e11fb955 TT |
2237 | /* Implement the type_align gdbarch function. */ |
2238 | ||
2239 | static ULONGEST | |
2240 | arc_type_align (struct gdbarch *gdbarch, struct type *type) | |
2241 | { | |
78134374 | 2242 | switch (type->code ()) |
5561fc30 AB |
2243 | { |
2244 | case TYPE_CODE_PTR: | |
2245 | case TYPE_CODE_FUNC: | |
2246 | case TYPE_CODE_FLAGS: | |
2247 | case TYPE_CODE_INT: | |
2248 | case TYPE_CODE_RANGE: | |
2249 | case TYPE_CODE_FLT: | |
2250 | case TYPE_CODE_ENUM: | |
2251 | case TYPE_CODE_REF: | |
2252 | case TYPE_CODE_RVALUE_REF: | |
2253 | case TYPE_CODE_CHAR: | |
2254 | case TYPE_CODE_BOOL: | |
2255 | case TYPE_CODE_DECFLOAT: | |
2256 | case TYPE_CODE_METHODPTR: | |
2257 | case TYPE_CODE_MEMBERPTR: | |
2258 | type = check_typedef (type); | |
2259 | return std::min<ULONGEST> (4, TYPE_LENGTH (type)); | |
2260 | default: | |
2261 | return 0; | |
2262 | } | |
e11fb955 TT |
2263 | } |
2264 | ||
ad0a504f AK |
2265 | /* Implement the "init" gdbarch method. */ |
2266 | ||
2267 | static struct gdbarch * | |
2268 | arc_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
2269 | { | |
2270 | const struct target_desc *tdesc; | |
c1e1314d | 2271 | tdesc_arch_data_up tdesc_data; |
ad0a504f | 2272 | |
d8d1feb4 | 2273 | arc_debug_printf ("Architecture initialization."); |
ad0a504f AK |
2274 | |
2275 | if (!arc_tdesc_init (info, &tdesc, &tdesc_data)) | |
fdd8731b | 2276 | return nullptr; |
ad0a504f | 2277 | |
b845c31e AK |
2278 | /* Allocate the ARC-private target-dependent information structure, and the |
2279 | GDB target-independent information structure. */ | |
fdd8731b SV |
2280 | gdb::unique_xmalloc_ptr<struct gdbarch_tdep> tdep |
2281 | (XCNEW (struct gdbarch_tdep)); | |
aaf43c48 | 2282 | tdep->jb_pc = -1; /* No longjmp support by default. */ |
c1e1314d | 2283 | tdep->has_hw_loops = arc_check_for_hw_loops (tdesc, tdesc_data.get ()); |
fdd8731b | 2284 | struct gdbarch *gdbarch = gdbarch_alloc (&info, tdep.release ()); |
ad0a504f AK |
2285 | |
2286 | /* Data types. */ | |
2287 | set_gdbarch_short_bit (gdbarch, 16); | |
2288 | set_gdbarch_int_bit (gdbarch, 32); | |
2289 | set_gdbarch_long_bit (gdbarch, 32); | |
2290 | set_gdbarch_long_long_bit (gdbarch, 64); | |
e11fb955 | 2291 | set_gdbarch_type_align (gdbarch, arc_type_align); |
ad0a504f AK |
2292 | set_gdbarch_float_bit (gdbarch, 32); |
2293 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); | |
2294 | set_gdbarch_double_bit (gdbarch, 64); | |
2295 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); | |
2296 | set_gdbarch_ptr_bit (gdbarch, 32); | |
2297 | set_gdbarch_addr_bit (gdbarch, 32); | |
2298 | set_gdbarch_char_signed (gdbarch, 0); | |
2299 | ||
2300 | set_gdbarch_write_pc (gdbarch, arc_write_pc); | |
2301 | ||
2302 | set_gdbarch_virtual_frame_pointer (gdbarch, arc_virtual_frame_pointer); | |
2303 | ||
2304 | /* tdesc_use_registers expects gdbarch_num_regs to return number of registers | |
2305 | parsed by gdbarch_init, and then it will add all of the remaining | |
2306 | registers and will increase number of registers. */ | |
2307 | set_gdbarch_num_regs (gdbarch, ARC_LAST_REGNUM + 1); | |
2308 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
2309 | set_gdbarch_sp_regnum (gdbarch, ARC_SP_REGNUM); | |
2310 | set_gdbarch_pc_regnum (gdbarch, ARC_PC_REGNUM); | |
2311 | set_gdbarch_ps_regnum (gdbarch, ARC_STATUS32_REGNUM); | |
2312 | set_gdbarch_fp0_regnum (gdbarch, -1); /* No FPU registers. */ | |
2313 | ||
ad0a504f AK |
2314 | set_gdbarch_push_dummy_call (gdbarch, arc_push_dummy_call); |
2315 | set_gdbarch_push_dummy_code (gdbarch, arc_push_dummy_code); | |
2316 | ||
2317 | set_gdbarch_cannot_fetch_register (gdbarch, arc_cannot_fetch_register); | |
2318 | set_gdbarch_cannot_store_register (gdbarch, arc_cannot_store_register); | |
2319 | ||
2320 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
2321 | ||
2322 | set_gdbarch_return_value (gdbarch, arc_return_value); | |
2323 | ||
2324 | set_gdbarch_skip_prologue (gdbarch, arc_skip_prologue); | |
2325 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
2326 | ||
04180708 YQ |
2327 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, arc_breakpoint_kind_from_pc); |
2328 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, arc_sw_breakpoint_from_kind); | |
ad0a504f AK |
2329 | |
2330 | /* On ARC 600 BRK_S instruction advances PC, unlike other ARC cores. */ | |
2331 | if (!arc_mach_is_arc600 (gdbarch)) | |
2332 | set_gdbarch_decr_pc_after_break (gdbarch, 0); | |
2333 | else | |
2334 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
2335 | ||
ad0a504f AK |
2336 | set_gdbarch_frame_align (gdbarch, arc_frame_align); |
2337 | ||
a87dc45a AK |
2338 | set_gdbarch_print_insn (gdbarch, arc_delayed_print_insn); |
2339 | ||
ad0a504f AK |
2340 | set_gdbarch_cannot_step_breakpoint (gdbarch, 1); |
2341 | ||
2342 | /* "nonsteppable" watchpoint means that watchpoint triggers before | |
2343 | instruction is committed, therefore it is required to remove watchpoint | |
2344 | to step though instruction that triggers it. ARC watchpoints trigger | |
2345 | only after instruction is committed, thus there is no need to remove | |
2346 | them. In fact on ARC watchpoint for memory writes may trigger with more | |
2347 | significant delay, like one or two instructions, depending on type of | |
2348 | memory where write is performed (CCM or external) and next instruction | |
2349 | after the memory write. */ | |
2350 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 0); | |
2351 | ||
2352 | /* This doesn't include possible long-immediate value. */ | |
2353 | set_gdbarch_max_insn_length (gdbarch, 4); | |
2354 | ||
2355 | /* Frame unwinders and sniffers. */ | |
2356 | dwarf2_frame_set_init_reg (gdbarch, arc_dwarf2_frame_init_reg); | |
2357 | dwarf2_append_unwinders (gdbarch); | |
b4e3cd04 | 2358 | frame_unwind_append_unwinder (gdbarch, &arc_sigtramp_frame_unwind); |
ad0a504f AK |
2359 | frame_unwind_append_unwinder (gdbarch, &arc_frame_unwind); |
2360 | frame_base_set_default (gdbarch, &arc_normal_base); | |
2361 | ||
2362 | /* Setup stuff specific to a particular environment (baremetal or Linux). | |
2363 | It can override functions set earlier. */ | |
2364 | gdbarch_init_osabi (info, gdbarch); | |
2365 | ||
fdd8731b | 2366 | if (gdbarch_tdep (gdbarch)->jb_pc >= 0) |
aaf43c48 AK |
2367 | set_gdbarch_get_longjmp_target (gdbarch, arc_get_longjmp_target); |
2368 | ||
a87dc45a AK |
2369 | /* Disassembler options. Enforce CPU if it was specified in XML target |
2370 | description, otherwise use default method of determining CPU (ELF private | |
2371 | header). */ | |
2372 | if (info.target_desc != NULL) | |
2373 | { | |
2374 | const struct bfd_arch_info *tdesc_arch | |
2375 | = tdesc_architecture (info.target_desc); | |
2376 | if (tdesc_arch != NULL) | |
2377 | { | |
2378 | xfree (arc_disassembler_options); | |
2379 | /* FIXME: It is not really good to change disassembler options | |
2380 | behind the scene, because that might override options | |
2381 | specified by the user. However as of now ARC doesn't support | |
2382 | `set disassembler-options' hence this code is the only place | |
2383 | where options are changed. It also changes options for all | |
2384 | existing gdbarches, which also can be problematic, if | |
2385 | arc_gdbarch_init will start reusing existing gdbarch | |
2386 | instances. */ | |
56d704da AK |
2387 | /* Target description specifies a BFD architecture, which is |
2388 | different from ARC cpu, as accepted by disassembler (and most | |
2389 | other ARC tools), because cpu values are much more fine grained - | |
2390 | there can be multiple cpu values per single BFD architecture. As | |
2391 | a result this code should translate architecture to some cpu | |
2392 | value. Since there is no info on exact cpu configuration, it is | |
2393 | best to use the most feature-rich CPU, so that disassembler will | |
2394 | recognize all instructions available to the specified | |
2395 | architecture. */ | |
2396 | switch (tdesc_arch->mach) | |
2397 | { | |
2398 | case bfd_mach_arc_arc601: | |
2399 | arc_disassembler_options = xstrdup ("cpu=arc601"); | |
2400 | break; | |
2401 | case bfd_mach_arc_arc600: | |
2402 | arc_disassembler_options = xstrdup ("cpu=arc600"); | |
2403 | break; | |
2404 | case bfd_mach_arc_arc700: | |
2405 | arc_disassembler_options = xstrdup ("cpu=arc700"); | |
2406 | break; | |
2407 | case bfd_mach_arc_arcv2: | |
2408 | /* Machine arcv2 has three arches: ARCv2, EM and HS; where ARCv2 | |
2409 | is treated as EM. */ | |
2410 | if (arc_arch_is_hs (tdesc_arch)) | |
2411 | arc_disassembler_options = xstrdup ("cpu=hs38_linux"); | |
2412 | else | |
2413 | arc_disassembler_options = xstrdup ("cpu=em4_fpuda"); | |
2414 | break; | |
2415 | default: | |
2416 | arc_disassembler_options = NULL; | |
2417 | break; | |
2418 | } | |
a87dc45a AK |
2419 | set_gdbarch_disassembler_options (gdbarch, |
2420 | &arc_disassembler_options); | |
2421 | } | |
2422 | } | |
2423 | ||
c1e1314d | 2424 | tdesc_use_registers (gdbarch, tdesc, std::move (tdesc_data)); |
ad0a504f AK |
2425 | |
2426 | return gdbarch; | |
2427 | } | |
2428 | ||
2429 | /* Implement the "dump_tdep" gdbarch method. */ | |
2430 | ||
2431 | static void | |
2432 | arc_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) | |
2433 | { | |
aaf43c48 AK |
2434 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
2435 | ||
2436 | fprintf_unfiltered (file, "arc_dump_tdep: jb_pc = %i\n", tdep->jb_pc); | |
b4e3cd04 AK |
2437 | |
2438 | fprintf_unfiltered (file, "arc_dump_tdep: is_sigtramp = <%s>\n", | |
2439 | host_address_to_string (tdep->is_sigtramp)); | |
2440 | fprintf_unfiltered (file, "arc_dump_tdep: sigcontext_addr = <%s>\n", | |
2441 | host_address_to_string (tdep->sigcontext_addr)); | |
2442 | fprintf_unfiltered (file, "arc_dump_tdep: sc_reg_offset = <%s>\n", | |
2443 | host_address_to_string (tdep->sc_reg_offset)); | |
2444 | fprintf_unfiltered (file, "arc_dump_tdep: sc_num_regs = %d\n", | |
2445 | tdep->sc_num_regs); | |
ad0a504f AK |
2446 | } |
2447 | ||
eea78757 AK |
2448 | /* This command accepts single argument - address of instruction to |
2449 | disassemble. */ | |
2450 | ||
2451 | static void | |
57f5a81b | 2452 | dump_arc_instruction_command (const char *args, int from_tty) |
eea78757 AK |
2453 | { |
2454 | struct value *val; | |
2455 | if (args != NULL && strlen (args) > 0) | |
2456 | val = evaluate_expression (parse_expression (args).get ()); | |
2457 | else | |
2458 | val = access_value_history (0); | |
2459 | record_latest_value (val); | |
2460 | ||
2461 | CORE_ADDR address = value_as_address (val); | |
2462 | struct arc_instruction insn; | |
2463 | struct disassemble_info di = arc_disassemble_info (target_gdbarch ()); | |
2464 | arc_insn_decode (address, &di, arc_delayed_print_insn, &insn); | |
2465 | arc_insn_dump (insn); | |
2466 | } | |
2467 | ||
6c265988 | 2468 | void _initialize_arc_tdep (); |
ad0a504f | 2469 | void |
6c265988 | 2470 | _initialize_arc_tdep () |
ad0a504f AK |
2471 | { |
2472 | gdbarch_register (bfd_arch_arc, arc_gdbarch_init, arc_dump_tdep); | |
2473 | ||
ad0a504f AK |
2474 | /* Register ARC-specific commands with gdb. */ |
2475 | ||
3be78afd | 2476 | /* Add root prefix command for "maintenance print arc" commands. */ |
0743fc83 TT |
2477 | add_show_prefix_cmd ("arc", class_maintenance, |
2478 | _("ARC-specific maintenance commands for printing GDB " | |
2479 | "internal state."), | |
2480 | &maintenance_print_arc_list, "maintenance print arc ", | |
2481 | 0, &maintenanceprintlist); | |
3be78afd | 2482 | |
eea78757 AK |
2483 | add_cmd ("arc-instruction", class_maintenance, |
2484 | dump_arc_instruction_command, | |
2485 | _("Dump arc_instruction structure for specified address."), | |
2486 | &maintenance_print_arc_list); | |
2487 | ||
ad0a504f | 2488 | /* Debug internals for ARC GDB. */ |
fb0f5031 SM |
2489 | add_setshow_boolean_cmd ("arc", class_maintenance, |
2490 | &arc_debug, | |
2491 | _("Set ARC specific debugging."), | |
2492 | _("Show ARC specific debugging."), | |
2493 | _("When set, ARC specific debugging is enabled."), | |
2494 | NULL, NULL, &setdebuglist, &showdebuglist); | |
ad0a504f | 2495 | } |