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29134980 | 1 | /* Target dependent code for CRIS, for GDB, the GNU debugger. |
6b4d5c91 AC |
2 | |
3 | Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. | |
4 | ||
29134980 OF |
5 | Contributed by Axis Communications AB. |
6 | Written by Hendrik Ruijter, Stefan Andersson, and Orjan Friberg. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #include "defs.h" | |
25 | #include "frame.h" | |
2e4b5889 OF |
26 | #include "frame-unwind.h" |
27 | #include "frame-base.h" | |
28 | #include "trad-frame.h" | |
29 | #include "dwarf2-frame.h" | |
29134980 OF |
30 | #include "symtab.h" |
31 | #include "inferior.h" | |
32 | #include "gdbtypes.h" | |
33 | #include "gdbcore.h" | |
34 | #include "gdbcmd.h" | |
35 | #include "target.h" | |
36 | #include "value.h" | |
37 | #include "opcode/cris.h" | |
38 | #include "arch-utils.h" | |
39 | #include "regcache.h" | |
36482093 | 40 | #include "gdb_assert.h" |
29134980 OF |
41 | |
42 | /* To get entry_point_address. */ | |
9ab9195f | 43 | #include "objfiles.h" |
29134980 | 44 | |
dbbff683 OF |
45 | #include "solib.h" /* Support for shared libraries. */ |
46 | #include "solib-svr4.h" /* For struct link_map_offsets. */ | |
9bbe19fb | 47 | #include "gdb_string.h" |
a89aa300 | 48 | #include "dis-asm.h" |
dbbff683 OF |
49 | |
50 | ||
29134980 OF |
51 | enum cris_num_regs |
52 | { | |
53 | /* There are no floating point registers. Used in gdbserver low-linux.c. */ | |
54 | NUM_FREGS = 0, | |
55 | ||
56 | /* There are 16 general registers. */ | |
57 | NUM_GENREGS = 16, | |
58 | ||
59 | /* There are 16 special registers. */ | |
60 | NUM_SPECREGS = 16 | |
61 | }; | |
62 | ||
63 | /* Register numbers of various important registers. | |
2e4b5889 | 64 | CRIS_FP_REGNUM Contains address of executing stack frame. |
29134980 OF |
65 | STR_REGNUM Contains the address of structure return values. |
66 | RET_REGNUM Contains the return value when shorter than or equal to 32 bits | |
67 | ARG1_REGNUM Contains the first parameter to a function. | |
68 | ARG2_REGNUM Contains the second parameter to a function. | |
69 | ARG3_REGNUM Contains the third parameter to a function. | |
70 | ARG4_REGNUM Contains the fourth parameter to a function. Rest on stack. | |
71 | SP_REGNUM Contains address of top of stack. | |
72 | PC_REGNUM Contains address of next instruction. | |
73 | SRP_REGNUM Subroutine return pointer register. | |
74 | BRP_REGNUM Breakpoint return pointer register. */ | |
75 | ||
29134980 OF |
76 | enum cris_regnums |
77 | { | |
78 | /* Enums with respect to the general registers, valid for all | |
79 | CRIS versions. */ | |
2e4b5889 | 80 | CRIS_FP_REGNUM = 8, |
29134980 OF |
81 | STR_REGNUM = 9, |
82 | RET_REGNUM = 10, | |
83 | ARG1_REGNUM = 10, | |
84 | ARG2_REGNUM = 11, | |
85 | ARG3_REGNUM = 12, | |
86 | ARG4_REGNUM = 13, | |
87 | ||
88 | /* Enums with respect to the special registers, some of which may not be | |
89 | applicable to all CRIS versions. */ | |
90 | P0_REGNUM = 16, | |
91 | VR_REGNUM = 17, | |
92 | P2_REGNUM = 18, | |
93 | P3_REGNUM = 19, | |
94 | P4_REGNUM = 20, | |
95 | CCR_REGNUM = 21, | |
96 | MOF_REGNUM = 23, | |
97 | P8_REGNUM = 24, | |
98 | IBR_REGNUM = 25, | |
99 | IRP_REGNUM = 26, | |
100 | SRP_REGNUM = 27, | |
101 | BAR_REGNUM = 28, | |
2a9ecef2 | 102 | DCCR_REGNUM = 29, |
29134980 OF |
103 | BRP_REGNUM = 30, |
104 | USP_REGNUM = 31 | |
105 | }; | |
106 | ||
107 | extern const struct cris_spec_reg cris_spec_regs[]; | |
108 | ||
109 | /* CRIS version, set via the user command 'set cris-version'. Affects | |
110 | register names and sizes.*/ | |
111 | static int usr_cmd_cris_version; | |
112 | ||
113 | /* Indicates whether to trust the above variable. */ | |
114 | static int usr_cmd_cris_version_valid = 0; | |
115 | ||
116 | /* CRIS mode, set via the user command 'set cris-mode'. Affects availability | |
117 | of some registers. */ | |
118 | static const char *usr_cmd_cris_mode; | |
119 | ||
120 | /* Indicates whether to trust the above variable. */ | |
121 | static int usr_cmd_cris_mode_valid = 0; | |
122 | ||
123 | static const char CRIS_MODE_USER[] = "CRIS_MODE_USER"; | |
124 | static const char CRIS_MODE_SUPERVISOR[] = "CRIS_MODE_SUPERVISOR"; | |
125 | static const char *cris_mode_enums[] = | |
126 | { | |
127 | CRIS_MODE_USER, | |
128 | CRIS_MODE_SUPERVISOR, | |
129 | 0 | |
130 | }; | |
131 | ||
29134980 OF |
132 | /* CRIS architecture specific information. */ |
133 | struct gdbarch_tdep | |
134 | { | |
135 | int cris_version; | |
136 | const char *cris_mode; | |
29134980 OF |
137 | }; |
138 | ||
139 | /* Functions for accessing target dependent data. */ | |
140 | ||
141 | static int | |
142 | cris_version (void) | |
143 | { | |
144 | return (gdbarch_tdep (current_gdbarch)->cris_version); | |
145 | } | |
146 | ||
147 | static const char * | |
148 | cris_mode (void) | |
149 | { | |
150 | return (gdbarch_tdep (current_gdbarch)->cris_mode); | |
151 | } | |
152 | ||
2e4b5889 | 153 | struct cris_unwind_cache |
29134980 | 154 | { |
2e4b5889 OF |
155 | /* The previous frame's inner most stack address. Used as this |
156 | frame ID's stack_addr. */ | |
157 | CORE_ADDR prev_sp; | |
158 | /* The frame's base, optionally used by the high-level debug info. */ | |
159 | CORE_ADDR base; | |
160 | int size; | |
161 | /* How far the SP and r8 (FP) have been offset from the start of | |
162 | the stack frame (as defined by the previous frame's stack | |
163 | pointer). */ | |
164 | LONGEST sp_offset; | |
165 | LONGEST r8_offset; | |
166 | int uses_frame; | |
167 | ||
168 | /* From old frame_extra_info struct. */ | |
29134980 OF |
169 | CORE_ADDR return_pc; |
170 | int leaf_function; | |
2e4b5889 OF |
171 | |
172 | /* Table indicating the location of each and every register. */ | |
173 | struct trad_frame_saved_reg *saved_regs; | |
29134980 OF |
174 | }; |
175 | ||
176 | /* The instruction environment needed to find single-step breakpoints. */ | |
177 | typedef | |
178 | struct instruction_environment | |
179 | { | |
180 | unsigned long reg[NUM_GENREGS]; | |
181 | unsigned long preg[NUM_SPECREGS]; | |
182 | unsigned long branch_break_address; | |
183 | unsigned long delay_slot_pc; | |
184 | unsigned long prefix_value; | |
185 | int branch_found; | |
186 | int prefix_found; | |
187 | int invalid; | |
188 | int slot_needed; | |
189 | int delay_slot_pc_active; | |
190 | int xflag_found; | |
191 | int disable_interrupt; | |
192 | } inst_env_type; | |
193 | ||
194 | /* Save old breakpoints in order to restore the state before a single_step. | |
195 | At most, two breakpoints will have to be remembered. */ | |
196 | typedef | |
197 | char binsn_quantum[BREAKPOINT_MAX]; | |
198 | static binsn_quantum break_mem[2]; | |
199 | static CORE_ADDR next_pc = 0; | |
200 | static CORE_ADDR branch_target_address = 0; | |
201 | static unsigned char branch_break_inserted = 0; | |
202 | ||
203 | /* Machine-dependencies in CRIS for opcodes. */ | |
204 | ||
205 | /* Instruction sizes. */ | |
206 | enum cris_instruction_sizes | |
207 | { | |
208 | INST_BYTE_SIZE = 0, | |
209 | INST_WORD_SIZE = 1, | |
210 | INST_DWORD_SIZE = 2 | |
211 | }; | |
212 | ||
213 | /* Addressing modes. */ | |
214 | enum cris_addressing_modes | |
215 | { | |
216 | REGISTER_MODE = 1, | |
217 | INDIRECT_MODE = 2, | |
218 | AUTOINC_MODE = 3 | |
219 | }; | |
220 | ||
221 | /* Prefix addressing modes. */ | |
222 | enum cris_prefix_addressing_modes | |
223 | { | |
224 | PREFIX_INDEX_MODE = 2, | |
225 | PREFIX_ASSIGN_MODE = 3, | |
226 | ||
227 | /* Handle immediate byte offset addressing mode prefix format. */ | |
228 | PREFIX_OFFSET_MODE = 2 | |
229 | }; | |
230 | ||
231 | /* Masks for opcodes. */ | |
232 | enum cris_opcode_masks | |
233 | { | |
234 | BRANCH_SIGNED_SHORT_OFFSET_MASK = 0x1, | |
235 | SIGNED_EXTEND_BIT_MASK = 0x2, | |
236 | SIGNED_BYTE_MASK = 0x80, | |
237 | SIGNED_BYTE_EXTEND_MASK = 0xFFFFFF00, | |
238 | SIGNED_WORD_MASK = 0x8000, | |
239 | SIGNED_WORD_EXTEND_MASK = 0xFFFF0000, | |
240 | SIGNED_DWORD_MASK = 0x80000000, | |
241 | SIGNED_QUICK_VALUE_MASK = 0x20, | |
242 | SIGNED_QUICK_VALUE_EXTEND_MASK = 0xFFFFFFC0 | |
243 | }; | |
244 | ||
245 | /* Functions for opcodes. The general form of the ETRAX 16-bit instruction: | |
246 | Bit 15 - 12 Operand2 | |
247 | 11 - 10 Mode | |
248 | 9 - 6 Opcode | |
249 | 5 - 4 Size | |
250 | 3 - 0 Operand1 */ | |
251 | ||
252 | static int | |
253 | cris_get_operand2 (unsigned short insn) | |
254 | { | |
255 | return ((insn & 0xF000) >> 12); | |
256 | } | |
257 | ||
258 | static int | |
259 | cris_get_mode (unsigned short insn) | |
260 | { | |
261 | return ((insn & 0x0C00) >> 10); | |
262 | } | |
263 | ||
264 | static int | |
265 | cris_get_opcode (unsigned short insn) | |
266 | { | |
267 | return ((insn & 0x03C0) >> 6); | |
268 | } | |
269 | ||
270 | static int | |
271 | cris_get_size (unsigned short insn) | |
272 | { | |
273 | return ((insn & 0x0030) >> 4); | |
274 | } | |
275 | ||
276 | static int | |
277 | cris_get_operand1 (unsigned short insn) | |
278 | { | |
279 | return (insn & 0x000F); | |
280 | } | |
281 | ||
282 | /* Additional functions in order to handle opcodes. */ | |
283 | ||
29134980 OF |
284 | static int |
285 | cris_get_quick_value (unsigned short insn) | |
286 | { | |
287 | return (insn & 0x003F); | |
288 | } | |
289 | ||
290 | static int | |
291 | cris_get_bdap_quick_offset (unsigned short insn) | |
292 | { | |
293 | return (insn & 0x00FF); | |
294 | } | |
295 | ||
296 | static int | |
297 | cris_get_branch_short_offset (unsigned short insn) | |
298 | { | |
299 | return (insn & 0x00FF); | |
300 | } | |
301 | ||
302 | static int | |
303 | cris_get_asr_shift_steps (unsigned long value) | |
304 | { | |
305 | return (value & 0x3F); | |
306 | } | |
307 | ||
29134980 OF |
308 | static int |
309 | cris_get_clear_size (unsigned short insn) | |
310 | { | |
311 | return ((insn) & 0xC000); | |
312 | } | |
313 | ||
314 | static int | |
315 | cris_is_signed_extend_bit_on (unsigned short insn) | |
316 | { | |
317 | return (((insn) & 0x20) == 0x20); | |
318 | } | |
319 | ||
320 | static int | |
321 | cris_is_xflag_bit_on (unsigned short insn) | |
322 | { | |
323 | return (((insn) & 0x1000) == 0x1000); | |
324 | } | |
325 | ||
326 | static void | |
327 | cris_set_size_to_dword (unsigned short *insn) | |
328 | { | |
329 | *insn &= 0xFFCF; | |
330 | *insn |= 0x20; | |
331 | } | |
332 | ||
8535cb38 | 333 | static signed char |
29134980 OF |
334 | cris_get_signed_offset (unsigned short insn) |
335 | { | |
8535cb38 | 336 | return ((signed char) (insn & 0x00FF)); |
29134980 OF |
337 | } |
338 | ||
339 | /* Calls an op function given the op-type, working on the insn and the | |
340 | inst_env. */ | |
341 | static void cris_gdb_func (enum cris_op_type, unsigned short, inst_env_type *); | |
342 | ||
29134980 OF |
343 | static struct gdbarch *cris_gdbarch_init (struct gdbarch_info, |
344 | struct gdbarch_list *); | |
345 | ||
29134980 OF |
346 | static void cris_dump_tdep (struct gdbarch *, struct ui_file *); |
347 | ||
348 | static void cris_version_update (char *ignore_args, int from_tty, | |
349 | struct cmd_list_element *c); | |
350 | ||
351 | static void cris_mode_update (char *ignore_args, int from_tty, | |
352 | struct cmd_list_element *c); | |
353 | ||
2e4b5889 OF |
354 | static CORE_ADDR cris_scan_prologue (CORE_ADDR pc, |
355 | struct frame_info *next_frame, | |
356 | struct cris_unwind_cache *info); | |
357 | ||
358 | static CORE_ADDR cris_unwind_pc (struct gdbarch *gdbarch, | |
359 | struct frame_info *next_frame); | |
360 | ||
361 | static CORE_ADDR cris_unwind_sp (struct gdbarch *gdbarch, | |
362 | struct frame_info *next_frame); | |
363 | ||
364 | /* When arguments must be pushed onto the stack, they go on in reverse | |
365 | order. The below implements a FILO (stack) to do this. */ | |
366 | ||
367 | /* Borrowed from d10v-tdep.c. */ | |
368 | ||
369 | struct stack_item | |
370 | { | |
371 | int len; | |
372 | struct stack_item *prev; | |
373 | void *data; | |
374 | }; | |
375 | ||
376 | static struct stack_item * | |
377 | push_stack_item (struct stack_item *prev, void *contents, int len) | |
378 | { | |
379 | struct stack_item *si; | |
380 | si = xmalloc (sizeof (struct stack_item)); | |
381 | si->data = xmalloc (len); | |
382 | si->len = len; | |
383 | si->prev = prev; | |
384 | memcpy (si->data, contents, len); | |
385 | return si; | |
386 | } | |
387 | ||
388 | static struct stack_item * | |
389 | pop_stack_item (struct stack_item *si) | |
390 | { | |
391 | struct stack_item *dead = si; | |
392 | si = si->prev; | |
393 | xfree (dead->data); | |
394 | xfree (dead); | |
395 | return si; | |
396 | } | |
397 | ||
398 | /* Put here the code to store, into fi->saved_regs, the addresses of | |
399 | the saved registers of frame described by FRAME_INFO. This | |
400 | includes special registers such as pc and fp saved in special ways | |
401 | in the stack frame. sp is even more special: the address we return | |
402 | for it IS the sp for the next frame. */ | |
403 | ||
404 | struct cris_unwind_cache * | |
405 | cris_frame_unwind_cache (struct frame_info *next_frame, | |
406 | void **this_prologue_cache) | |
407 | { | |
408 | CORE_ADDR pc; | |
409 | struct cris_unwind_cache *info; | |
410 | int i; | |
411 | ||
412 | if ((*this_prologue_cache)) | |
413 | return (*this_prologue_cache); | |
414 | ||
415 | info = FRAME_OBSTACK_ZALLOC (struct cris_unwind_cache); | |
416 | (*this_prologue_cache) = info; | |
417 | info->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
418 | ||
419 | /* Zero all fields. */ | |
420 | info->prev_sp = 0; | |
421 | info->base = 0; | |
422 | info->size = 0; | |
423 | info->sp_offset = 0; | |
424 | info->r8_offset = 0; | |
425 | info->uses_frame = 0; | |
426 | info->return_pc = 0; | |
427 | info->leaf_function = 0; | |
428 | ||
429 | /* Prologue analysis does the rest... */ | |
430 | cris_scan_prologue (frame_func_unwind (next_frame), next_frame, info); | |
431 | ||
432 | return info; | |
433 | } | |
434 | ||
435 | /* Given a GDB frame, determine the address of the calling function's | |
436 | frame. This will be used to create a new GDB frame struct. */ | |
437 | ||
438 | static void | |
439 | cris_frame_this_id (struct frame_info *next_frame, | |
440 | void **this_prologue_cache, | |
441 | struct frame_id *this_id) | |
442 | { | |
443 | struct cris_unwind_cache *info | |
444 | = cris_frame_unwind_cache (next_frame, this_prologue_cache); | |
445 | CORE_ADDR base; | |
446 | CORE_ADDR func; | |
447 | struct frame_id id; | |
448 | ||
449 | /* The FUNC is easy. */ | |
450 | func = frame_func_unwind (next_frame); | |
451 | ||
452 | /* Hopefully the prologue analysis either correctly determined the | |
453 | frame's base (which is the SP from the previous frame), or set | |
454 | that base to "NULL". */ | |
455 | base = info->prev_sp; | |
456 | if (base == 0) | |
457 | return; | |
458 | ||
459 | id = frame_id_build (base, func); | |
460 | ||
461 | (*this_id) = id; | |
462 | } | |
463 | ||
464 | static void | |
465 | cris_frame_prev_register (struct frame_info *next_frame, | |
466 | void **this_prologue_cache, | |
467 | int regnum, int *optimizedp, | |
468 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
469 | int *realnump, void *bufferp) | |
470 | { | |
471 | struct cris_unwind_cache *info | |
472 | = cris_frame_unwind_cache (next_frame, this_prologue_cache); | |
1f67027d AC |
473 | trad_frame_get_prev_register (next_frame, info->saved_regs, regnum, |
474 | optimizedp, lvalp, addrp, realnump, bufferp); | |
2e4b5889 OF |
475 | } |
476 | ||
477 | /* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that | |
478 | dummy frame. The frame ID's base needs to match the TOS value | |
479 | saved by save_dummy_frame_tos(), and the PC match the dummy frame's | |
480 | breakpoint. */ | |
481 | ||
482 | static struct frame_id | |
483 | cris_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
484 | { | |
485 | return frame_id_build (cris_unwind_sp (gdbarch, next_frame), | |
486 | frame_pc_unwind (next_frame)); | |
487 | } | |
488 | ||
489 | static CORE_ADDR | |
490 | cris_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
491 | { | |
492 | /* Align to the size of an instruction (so that they can safely be | |
493 | pushed onto the stack). */ | |
494 | return sp & ~3; | |
495 | } | |
496 | ||
497 | static CORE_ADDR | |
498 | cris_push_dummy_code (struct gdbarch *gdbarch, | |
499 | CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc, | |
500 | struct value **args, int nargs, | |
501 | struct type *value_type, | |
502 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) | |
503 | { | |
504 | /* Allocate space sufficient for a breakpoint. */ | |
505 | sp = (sp - 4) & ~3; | |
506 | /* Store the address of that breakpoint */ | |
507 | *bp_addr = sp; | |
508 | /* CRIS always starts the call at the callee's entry point. */ | |
509 | *real_pc = funaddr; | |
510 | return sp; | |
511 | } | |
512 | ||
513 | static CORE_ADDR | |
7d9b040b | 514 | cris_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
2e4b5889 OF |
515 | struct regcache *regcache, CORE_ADDR bp_addr, |
516 | int nargs, struct value **args, CORE_ADDR sp, | |
517 | int struct_return, CORE_ADDR struct_addr) | |
518 | { | |
519 | int stack_alloc; | |
520 | int stack_offset; | |
521 | int argreg; | |
522 | int argnum; | |
523 | ||
524 | CORE_ADDR regval; | |
525 | ||
526 | /* The function's arguments and memory allocated by gdb for the arguments to | |
527 | point at reside in separate areas on the stack. | |
528 | Both frame pointers grow toward higher addresses. */ | |
529 | CORE_ADDR fp_arg; | |
530 | CORE_ADDR fp_mem; | |
531 | ||
532 | struct stack_item *si = NULL; | |
533 | ||
534 | /* Push the return address. */ | |
535 | regcache_cooked_write_unsigned (regcache, SRP_REGNUM, bp_addr); | |
536 | ||
537 | /* Are we returning a value using a structure return or a normal value | |
538 | return? struct_addr is the address of the reserved space for the return | |
539 | structure to be written on the stack. */ | |
540 | if (struct_return) | |
541 | { | |
542 | regcache_cooked_write_unsigned (regcache, STR_REGNUM, struct_addr); | |
543 | } | |
544 | ||
545 | /* Now load as many as possible of the first arguments into registers, | |
546 | and push the rest onto the stack. */ | |
547 | argreg = ARG1_REGNUM; | |
548 | stack_offset = 0; | |
549 | ||
550 | for (argnum = 0; argnum < nargs; argnum++) | |
551 | { | |
552 | int len; | |
553 | char *val; | |
554 | int reg_demand; | |
555 | int i; | |
556 | ||
557 | len = TYPE_LENGTH (VALUE_TYPE (args[argnum])); | |
558 | val = (char *) VALUE_CONTENTS (args[argnum]); | |
559 | ||
560 | /* How may registers worth of storage do we need for this argument? */ | |
561 | reg_demand = (len / 4) + (len % 4 != 0 ? 1 : 0); | |
562 | ||
563 | if (len <= (2 * 4) && (argreg + reg_demand - 1 <= ARG4_REGNUM)) | |
564 | { | |
565 | /* Data passed by value. Fits in available register(s). */ | |
566 | for (i = 0; i < reg_demand; i++) | |
567 | { | |
568 | regcache_cooked_write_unsigned (regcache, argreg, | |
569 | *(unsigned long *) val); | |
570 | argreg++; | |
571 | val += 4; | |
572 | } | |
573 | } | |
574 | else if (len <= (2 * 4) && argreg <= ARG4_REGNUM) | |
575 | { | |
576 | /* Data passed by value. Does not fit in available register(s). | |
577 | Use the register(s) first, then the stack. */ | |
578 | for (i = 0; i < reg_demand; i++) | |
579 | { | |
580 | if (argreg <= ARG4_REGNUM) | |
581 | { | |
582 | regcache_cooked_write_unsigned (regcache, argreg, | |
583 | *(unsigned long *) val); | |
584 | argreg++; | |
585 | val += 4; | |
586 | } | |
587 | else | |
588 | { | |
589 | /* Push item for later so that pushed arguments | |
590 | come in the right order. */ | |
591 | si = push_stack_item (si, val, 4); | |
592 | val += 4; | |
593 | } | |
594 | } | |
595 | } | |
596 | else if (len > (2 * 4)) | |
597 | { | |
598 | /* FIXME */ | |
599 | internal_error (__FILE__, __LINE__, "We don't do this"); | |
600 | } | |
601 | else | |
602 | { | |
603 | /* Data passed by value. No available registers. Put it on | |
604 | the stack. */ | |
605 | si = push_stack_item (si, val, len); | |
606 | } | |
607 | } | |
608 | ||
609 | while (si) | |
610 | { | |
611 | /* fp_arg must be word-aligned (i.e., don't += len) to match | |
612 | the function prologue. */ | |
613 | sp = (sp - si->len) & ~3; | |
614 | write_memory (sp, si->data, si->len); | |
615 | si = pop_stack_item (si); | |
616 | } | |
617 | ||
618 | /* Finally, update the SP register. */ | |
619 | regcache_cooked_write_unsigned (regcache, SP_REGNUM, sp); | |
620 | ||
621 | return sp; | |
622 | } | |
623 | ||
624 | static const struct frame_unwind cris_frame_unwind = { | |
625 | NORMAL_FRAME, | |
626 | cris_frame_this_id, | |
627 | cris_frame_prev_register | |
628 | }; | |
629 | ||
630 | const struct frame_unwind * | |
631 | cris_frame_sniffer (struct frame_info *next_frame) | |
632 | { | |
633 | return &cris_frame_unwind; | |
634 | } | |
635 | ||
636 | static CORE_ADDR | |
637 | cris_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
638 | { | |
639 | struct cris_unwind_cache *info | |
640 | = cris_frame_unwind_cache (next_frame, this_cache); | |
641 | return info->base; | |
642 | } | |
643 | ||
644 | static const struct frame_base cris_frame_base = { | |
645 | &cris_frame_unwind, | |
646 | cris_frame_base_address, | |
647 | cris_frame_base_address, | |
648 | cris_frame_base_address | |
649 | }; | |
650 | ||
29134980 OF |
651 | /* Frames information. The definition of the struct frame_info is |
652 | ||
653 | CORE_ADDR frame | |
654 | CORE_ADDR pc | |
5a203e44 | 655 | enum frame_type type; |
29134980 OF |
656 | CORE_ADDR return_pc |
657 | int leaf_function | |
658 | ||
659 | If the compilation option -fno-omit-frame-pointer is present the | |
660 | variable frame will be set to the content of R8 which is the frame | |
661 | pointer register. | |
662 | ||
663 | The variable pc contains the address where execution is performed | |
664 | in the present frame. The innermost frame contains the current content | |
665 | of the register PC. All other frames contain the content of the | |
666 | register PC in the next frame. | |
667 | ||
5a203e44 AC |
668 | The variable `type' indicates the frame's type: normal, SIGTRAMP |
669 | (associated with a signal handler), dummy (associated with a dummy | |
670 | frame). | |
29134980 OF |
671 | |
672 | The variable return_pc contains the address where execution should be | |
673 | resumed when the present frame has finished, the return address. | |
674 | ||
675 | The variable leaf_function is 1 if the return address is in the register | |
676 | SRP, and 0 if it is on the stack. | |
677 | ||
678 | Prologue instructions C-code. | |
679 | The prologue may consist of (-fno-omit-frame-pointer) | |
680 | 1) 2) | |
681 | push srp | |
682 | push r8 push r8 | |
683 | move.d sp,r8 move.d sp,r8 | |
684 | subq X,sp subq X,sp | |
685 | movem rY,[sp] movem rY,[sp] | |
686 | move.S rZ,[r8-U] move.S rZ,[r8-U] | |
687 | ||
688 | where 1 is a non-terminal function, and 2 is a leaf-function. | |
689 | ||
690 | Note that this assumption is extremely brittle, and will break at the | |
691 | slightest change in GCC's prologue. | |
692 | ||
693 | If local variables are declared or register contents are saved on stack | |
694 | the subq-instruction will be present with X as the number of bytes | |
695 | needed for storage. The reshuffle with respect to r8 may be performed | |
696 | with any size S (b, w, d) and any of the general registers Z={0..13}. | |
697 | The offset U should be representable by a signed 8-bit value in all cases. | |
698 | Thus, the prefix word is assumed to be immediate byte offset mode followed | |
699 | by another word containing the instruction. | |
700 | ||
701 | Degenerate cases: | |
702 | 3) | |
703 | push r8 | |
704 | move.d sp,r8 | |
705 | move.d r8,sp | |
706 | pop r8 | |
707 | ||
708 | Prologue instructions C++-code. | |
709 | Case 1) and 2) in the C-code may be followed by | |
710 | ||
711 | move.d r10,rS ; this | |
712 | move.d r11,rT ; P1 | |
713 | move.d r12,rU ; P2 | |
714 | move.d r13,rV ; P3 | |
715 | move.S [r8+U],rZ ; P4 | |
716 | ||
717 | if any of the call parameters are stored. The host expects these | |
718 | instructions to be executed in order to get the call parameters right. */ | |
719 | ||
720 | /* Examine the prologue of a function. The variable ip is the address of | |
721 | the first instruction of the prologue. The variable limit is the address | |
722 | of the first instruction after the prologue. The variable fi contains the | |
723 | information in struct frame_info. The variable frameless_p controls whether | |
724 | the entire prologue is examined (0) or just enough instructions to | |
725 | determine that it is a prologue (1). */ | |
726 | ||
a78f21af | 727 | static CORE_ADDR |
2e4b5889 OF |
728 | cris_scan_prologue (CORE_ADDR pc, struct frame_info *next_frame, |
729 | struct cris_unwind_cache *info) | |
29134980 OF |
730 | { |
731 | /* Present instruction. */ | |
732 | unsigned short insn; | |
733 | ||
734 | /* Next instruction, lookahead. */ | |
735 | unsigned short insn_next; | |
736 | int regno; | |
737 | ||
738 | /* Is there a push fp? */ | |
739 | int have_fp; | |
740 | ||
741 | /* Number of byte on stack used for local variables and movem. */ | |
742 | int val; | |
743 | ||
744 | /* Highest register number in a movem. */ | |
745 | int regsave; | |
746 | ||
747 | /* move.d r<source_register>,rS */ | |
748 | short source_register; | |
749 | ||
2e4b5889 OF |
750 | /* Scan limit. */ |
751 | int limit; | |
29134980 | 752 | |
2e4b5889 OF |
753 | /* This frame is with respect to a leaf until a push srp is found. */ |
754 | if (info) | |
755 | { | |
756 | info->leaf_function = 1; | |
757 | } | |
29134980 OF |
758 | |
759 | /* Assume nothing on stack. */ | |
760 | val = 0; | |
761 | regsave = -1; | |
762 | ||
2e4b5889 OF |
763 | /* If we were called without a next_frame, that means we were called |
764 | from cris_skip_prologue which already tried to find the end of the | |
765 | prologue through the symbol information. 64 instructions past current | |
766 | pc is arbitrarily chosen, but at least it means we'll stop eventually. */ | |
767 | limit = next_frame ? frame_pc_unwind (next_frame) : pc + 64; | |
29134980 | 768 | |
29134980 | 769 | /* Find the prologue instructions. */ |
2e4b5889 | 770 | while (pc < limit) |
29134980 | 771 | { |
2e4b5889 OF |
772 | insn = read_memory_unsigned_integer (pc, 2); |
773 | pc += 2; | |
29134980 OF |
774 | if (insn == 0xE1FC) |
775 | { | |
776 | /* push <reg> 32 bit instruction */ | |
2e4b5889 OF |
777 | insn_next = read_memory_unsigned_integer (pc, 2); |
778 | pc += 2; | |
29134980 | 779 | regno = cris_get_operand2 (insn_next); |
2e4b5889 OF |
780 | if (info) |
781 | { | |
782 | info->sp_offset += 4; | |
783 | } | |
dbbff683 OF |
784 | /* This check, meant to recognize srp, used to be regno == |
785 | (SRP_REGNUM - NUM_GENREGS), but that covers r11 also. */ | |
786 | if (insn_next == 0xBE7E) | |
29134980 | 787 | { |
2e4b5889 OF |
788 | if (info) |
789 | { | |
790 | info->leaf_function = 0; | |
791 | } | |
29134980 | 792 | } |
b4206d25 OF |
793 | else if (insn_next == 0x8FEE) |
794 | { | |
795 | /* push $r8 */ | |
796 | if (info) | |
797 | { | |
798 | info->r8_offset = info->sp_offset; | |
799 | } | |
800 | } | |
29134980 OF |
801 | } |
802 | else if (insn == 0x866E) | |
803 | { | |
804 | /* move.d sp,r8 */ | |
2e4b5889 OF |
805 | if (info) |
806 | { | |
807 | info->uses_frame = 1; | |
2e4b5889 | 808 | } |
29134980 OF |
809 | continue; |
810 | } | |
811 | else if (cris_get_operand2 (insn) == SP_REGNUM | |
812 | && cris_get_mode (insn) == 0x0000 | |
813 | && cris_get_opcode (insn) == 0x000A) | |
814 | { | |
815 | /* subq <val>,sp */ | |
2e4b5889 OF |
816 | if (info) |
817 | { | |
818 | info->sp_offset += cris_get_quick_value (insn); | |
819 | } | |
29134980 OF |
820 | } |
821 | else if (cris_get_mode (insn) == 0x0002 | |
822 | && cris_get_opcode (insn) == 0x000F | |
823 | && cris_get_size (insn) == 0x0003 | |
824 | && cris_get_operand1 (insn) == SP_REGNUM) | |
825 | { | |
826 | /* movem r<regsave>,[sp] */ | |
29134980 OF |
827 | regsave = cris_get_operand2 (insn); |
828 | } | |
829 | else if (cris_get_operand2 (insn) == SP_REGNUM | |
830 | && ((insn & 0x0F00) >> 8) == 0x0001 | |
831 | && (cris_get_signed_offset (insn) < 0)) | |
832 | { | |
833 | /* Immediate byte offset addressing prefix word with sp as base | |
834 | register. Used for CRIS v8 i.e. ETRAX 100 and newer if <val> | |
835 | is between 64 and 128. | |
836 | movem r<regsave>,[sp=sp-<val>] */ | |
2e4b5889 OF |
837 | if (info) |
838 | { | |
839 | info->sp_offset += -cris_get_signed_offset (insn); | |
840 | } | |
841 | insn_next = read_memory_unsigned_integer (pc, 2); | |
842 | pc += 2; | |
29134980 OF |
843 | if (cris_get_mode (insn_next) == PREFIX_ASSIGN_MODE |
844 | && cris_get_opcode (insn_next) == 0x000F | |
845 | && cris_get_size (insn_next) == 0x0003 | |
846 | && cris_get_operand1 (insn_next) == SP_REGNUM) | |
847 | { | |
29134980 OF |
848 | regsave = cris_get_operand2 (insn_next); |
849 | } | |
850 | else | |
851 | { | |
852 | /* The prologue ended before the limit was reached. */ | |
2e4b5889 | 853 | pc -= 4; |
29134980 OF |
854 | break; |
855 | } | |
856 | } | |
857 | else if (cris_get_mode (insn) == 0x0001 | |
858 | && cris_get_opcode (insn) == 0x0009 | |
859 | && cris_get_size (insn) == 0x0002) | |
860 | { | |
861 | /* move.d r<10..13>,r<0..15> */ | |
29134980 | 862 | source_register = cris_get_operand1 (insn); |
2a9ecef2 OF |
863 | |
864 | /* FIXME? In the glibc solibs, the prologue might contain something | |
865 | like (this example taken from relocate_doit): | |
866 | move.d $pc,$r0 | |
867 | sub.d 0xfffef426,$r0 | |
868 | which isn't covered by the source_register check below. Question | |
869 | is whether to add a check for this combo, or make better use of | |
870 | the limit variable instead. */ | |
29134980 OF |
871 | if (source_register < ARG1_REGNUM || source_register > ARG4_REGNUM) |
872 | { | |
873 | /* The prologue ended before the limit was reached. */ | |
2e4b5889 | 874 | pc -= 2; |
29134980 OF |
875 | break; |
876 | } | |
877 | } | |
2e4b5889 | 878 | else if (cris_get_operand2 (insn) == CRIS_FP_REGNUM |
29134980 OF |
879 | /* The size is a fixed-size. */ |
880 | && ((insn & 0x0F00) >> 8) == 0x0001 | |
881 | /* A negative offset. */ | |
882 | && (cris_get_signed_offset (insn) < 0)) | |
883 | { | |
884 | /* move.S rZ,[r8-U] (?) */ | |
2e4b5889 OF |
885 | insn_next = read_memory_unsigned_integer (pc, 2); |
886 | pc += 2; | |
29134980 OF |
887 | regno = cris_get_operand2 (insn_next); |
888 | if ((regno >= 0 && regno < SP_REGNUM) | |
889 | && cris_get_mode (insn_next) == PREFIX_OFFSET_MODE | |
890 | && cris_get_opcode (insn_next) == 0x000F) | |
891 | { | |
892 | /* move.S rZ,[r8-U] */ | |
893 | continue; | |
894 | } | |
895 | else | |
896 | { | |
897 | /* The prologue ended before the limit was reached. */ | |
2e4b5889 | 898 | pc -= 4; |
29134980 OF |
899 | break; |
900 | } | |
901 | } | |
2e4b5889 | 902 | else if (cris_get_operand2 (insn) == CRIS_FP_REGNUM |
29134980 OF |
903 | /* The size is a fixed-size. */ |
904 | && ((insn & 0x0F00) >> 8) == 0x0001 | |
905 | /* A positive offset. */ | |
906 | && (cris_get_signed_offset (insn) > 0)) | |
907 | { | |
908 | /* move.S [r8+U],rZ (?) */ | |
2e4b5889 OF |
909 | insn_next = read_memory_unsigned_integer (pc, 2); |
910 | pc += 2; | |
29134980 OF |
911 | regno = cris_get_operand2 (insn_next); |
912 | if ((regno >= 0 && regno < SP_REGNUM) | |
913 | && cris_get_mode (insn_next) == PREFIX_OFFSET_MODE | |
914 | && cris_get_opcode (insn_next) == 0x0009 | |
915 | && cris_get_operand1 (insn_next) == regno) | |
916 | { | |
917 | /* move.S [r8+U],rZ */ | |
918 | continue; | |
919 | } | |
920 | else | |
921 | { | |
922 | /* The prologue ended before the limit was reached. */ | |
2e4b5889 | 923 | pc -= 4; |
29134980 OF |
924 | break; |
925 | } | |
926 | } | |
927 | else | |
928 | { | |
929 | /* The prologue ended before the limit was reached. */ | |
2e4b5889 | 930 | pc -= 2; |
29134980 OF |
931 | break; |
932 | } | |
933 | } | |
29134980 | 934 | |
2e4b5889 OF |
935 | /* We only want to know the end of the prologue when next_frame and info |
936 | are NULL (called from cris_skip_prologue i.e.). */ | |
937 | if (next_frame == NULL && info == NULL) | |
938 | { | |
939 | return pc; | |
940 | } | |
29134980 | 941 | |
2e4b5889 OF |
942 | info->size = info->sp_offset; |
943 | ||
944 | /* Compute the previous frame's stack pointer (which is also the | |
945 | frame's ID's stack address), and this frame's base pointer. */ | |
946 | if (info->uses_frame) | |
29134980 | 947 | { |
2e4b5889 OF |
948 | ULONGEST this_base; |
949 | /* The SP was moved to the FP. This indicates that a new frame | |
950 | was created. Get THIS frame's FP value by unwinding it from | |
951 | the next frame. */ | |
952 | frame_unwind_unsigned_register (next_frame, CRIS_FP_REGNUM, | |
953 | &this_base); | |
954 | info->base = this_base; | |
b4206d25 OF |
955 | info->saved_regs[CRIS_FP_REGNUM].addr = info->base; |
956 | ||
2e4b5889 OF |
957 | /* The FP points at the last saved register. Adjust the FP back |
958 | to before the first saved register giving the SP. */ | |
959 | info->prev_sp = info->base + info->r8_offset; | |
960 | } | |
961 | else | |
962 | { | |
963 | ULONGEST this_base; | |
964 | /* Assume that the FP is this frame's SP but with that pushed | |
965 | stack space added back. */ | |
966 | frame_unwind_unsigned_register (next_frame, SP_REGNUM, &this_base); | |
967 | info->base = this_base; | |
968 | info->prev_sp = info->base + info->size; | |
969 | } | |
29134980 | 970 | |
2e4b5889 OF |
971 | /* Calculate the addresses for the saved registers on the stack. */ |
972 | /* FIXME: The address calculation should really be done on the fly while | |
973 | we're analyzing the prologue (we only hold one regsave value as it is | |
974 | now). */ | |
975 | val = info->sp_offset; | |
976 | ||
977 | for (regno = regsave; regno >= 0; regno--) | |
978 | { | |
979 | info->saved_regs[regno].addr = info->base + info->r8_offset - val; | |
980 | val -= 4; | |
981 | } | |
982 | ||
983 | /* The previous frame's SP needed to be computed. Save the computed | |
984 | value. */ | |
985 | trad_frame_set_value (info->saved_regs, SP_REGNUM, info->prev_sp); | |
986 | ||
987 | if (!info->leaf_function) | |
988 | { | |
b4206d25 OF |
989 | /* SRP saved on the stack. But where? */ |
990 | if (info->r8_offset == 0) | |
991 | { | |
992 | /* R8 not pushed yet. */ | |
993 | info->saved_regs[SRP_REGNUM].addr = info->base; | |
994 | } | |
995 | else | |
996 | { | |
997 | /* R8 pushed, but SP may or may not be moved to R8 yet. */ | |
998 | info->saved_regs[SRP_REGNUM].addr = info->base + 4; | |
999 | } | |
29134980 | 1000 | } |
2e4b5889 OF |
1001 | |
1002 | /* The PC is found in SRP (the actual register or located on the stack). */ | |
1003 | info->saved_regs[PC_REGNUM] = info->saved_regs[SRP_REGNUM]; | |
1004 | ||
1005 | return pc; | |
29134980 OF |
1006 | } |
1007 | ||
1008 | /* Advance pc beyond any function entry prologue instructions at pc | |
1009 | to reach some "real" code. */ | |
1010 | ||
29134980 OF |
1011 | /* Given a PC value corresponding to the start of a function, return the PC |
1012 | of the first instruction after the function prologue. */ | |
1013 | ||
a78f21af | 1014 | static CORE_ADDR |
2e4b5889 | 1015 | cris_skip_prologue (CORE_ADDR pc) |
29134980 | 1016 | { |
2e4b5889 OF |
1017 | CORE_ADDR func_addr, func_end; |
1018 | struct symtab_and_line sal; | |
29134980 OF |
1019 | CORE_ADDR pc_after_prologue; |
1020 | ||
2e4b5889 OF |
1021 | /* If we have line debugging information, then the end of the prologue |
1022 | should the first assembly instruction of the first source line. */ | |
1023 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
1024 | { | |
1025 | sal = find_pc_line (func_addr, 0); | |
1026 | if (sal.end > 0 && sal.end < func_end) | |
1027 | return sal.end; | |
1028 | } | |
29134980 | 1029 | |
2e4b5889 | 1030 | pc_after_prologue = cris_scan_prologue (pc, NULL, NULL); |
29134980 OF |
1031 | return pc_after_prologue; |
1032 | } | |
1033 | ||
2e4b5889 OF |
1034 | static CORE_ADDR |
1035 | cris_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
1036 | { | |
1037 | ULONGEST pc; | |
1038 | frame_unwind_unsigned_register (next_frame, PC_REGNUM, &pc); | |
1039 | return pc; | |
1040 | } | |
1041 | ||
1042 | static CORE_ADDR | |
1043 | cris_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
1044 | { | |
1045 | ULONGEST sp; | |
1046 | frame_unwind_unsigned_register (next_frame, SP_REGNUM, &sp); | |
1047 | return sp; | |
1048 | } | |
1049 | ||
29134980 OF |
1050 | /* Use the program counter to determine the contents and size of a breakpoint |
1051 | instruction. It returns a pointer to a string of bytes that encode a | |
1052 | breakpoint instruction, stores the length of the string to *lenptr, and | |
1053 | adjusts pcptr (if necessary) to point to the actual memory location where | |
1054 | the breakpoint should be inserted. */ | |
1055 | ||
a78f21af | 1056 | static const unsigned char * |
29134980 OF |
1057 | cris_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
1058 | { | |
1059 | static unsigned char break_insn[] = {0x38, 0xe9}; | |
1060 | *lenptr = 2; | |
1061 | ||
1062 | return break_insn; | |
1063 | } | |
1064 | ||
29134980 OF |
1065 | /* Returns 1 if spec_reg is applicable to the current gdbarch's CRIS version, |
1066 | 0 otherwise. */ | |
1067 | ||
a78f21af | 1068 | static int |
29134980 OF |
1069 | cris_spec_reg_applicable (struct cris_spec_reg spec_reg) |
1070 | { | |
1071 | int version = cris_version (); | |
1072 | ||
1073 | switch (spec_reg.applicable_version) | |
1074 | { | |
1075 | case cris_ver_version_all: | |
1076 | return 1; | |
1077 | case cris_ver_warning: | |
1078 | /* Indeterminate/obsolete. */ | |
1079 | return 0; | |
1080 | case cris_ver_sim: | |
1081 | /* Simulator only. */ | |
1082 | return 0; | |
1083 | case cris_ver_v0_3: | |
1084 | return (version >= 0 && version <= 3); | |
1085 | case cris_ver_v3p: | |
1086 | return (version >= 3); | |
1087 | case cris_ver_v8: | |
1088 | return (version == 8 || version == 9); | |
1089 | case cris_ver_v8p: | |
1090 | return (version >= 8); | |
1091 | case cris_ver_v10p: | |
1092 | return (version >= 10); | |
1093 | default: | |
1094 | /* Invalid cris version. */ | |
1095 | return 0; | |
1096 | } | |
1097 | } | |
1098 | ||
29134980 OF |
1099 | /* Nonzero if regno should not be fetched from the target. This is the case |
1100 | for unimplemented (size 0) and non-existant registers. */ | |
1101 | ||
a78f21af | 1102 | static int |
29134980 OF |
1103 | cris_cannot_fetch_register (int regno) |
1104 | { | |
1105 | return ((regno < 0 || regno >= NUM_REGS) | |
1106 | || (cris_register_size (regno) == 0)); | |
1107 | } | |
1108 | ||
1109 | /* Nonzero if regno should not be written to the target, for various | |
1110 | reasons. */ | |
1111 | ||
a78f21af | 1112 | static int |
29134980 OF |
1113 | cris_cannot_store_register (int regno) |
1114 | { | |
1115 | /* There are three kinds of registers we refuse to write to. | |
1116 | 1. Those that not implemented. | |
1117 | 2. Those that are read-only (depends on the processor mode). | |
1118 | 3. Those registers to which a write has no effect. | |
1119 | */ | |
1120 | ||
1121 | if (regno < 0 || regno >= NUM_REGS || cris_register_size (regno) == 0) | |
1122 | /* Not implemented. */ | |
1123 | return 1; | |
1124 | ||
1125 | else if (regno == VR_REGNUM) | |
1126 | /* Read-only. */ | |
1127 | return 1; | |
1128 | ||
1129 | else if (regno == P0_REGNUM || regno == P4_REGNUM || regno == P8_REGNUM) | |
1130 | /* Writing has no effect. */ | |
1131 | return 1; | |
1132 | ||
1133 | else if (cris_mode () == CRIS_MODE_USER) | |
1134 | { | |
1135 | if (regno == IBR_REGNUM || regno == BAR_REGNUM || regno == BRP_REGNUM | |
1136 | || regno == IRP_REGNUM) | |
1137 | /* Read-only in user mode. */ | |
1138 | return 1; | |
1139 | } | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | /* Returns the register offset for the first byte of register regno's space | |
1145 | in the saved register state. Returns -1 for an invalid or unimplemented | |
1146 | register. */ | |
1147 | ||
a78f21af | 1148 | static int |
29134980 OF |
1149 | cris_register_offset (int regno) |
1150 | { | |
1151 | int i; | |
1152 | int reg_size; | |
1153 | int offset = 0; | |
1154 | ||
1155 | if (regno >= 0 && regno < NUM_REGS) | |
1156 | { | |
1157 | /* FIXME: The offsets should be cached and calculated only once, | |
1158 | when the architecture being debugged has changed. */ | |
1159 | for (i = 0; i < regno; i++) | |
1160 | offset += cris_register_size (i); | |
1161 | ||
1162 | return offset; | |
1163 | } | |
1164 | else | |
1165 | { | |
1166 | /* Invalid register. */ | |
1167 | return -1; | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | /* Return the GDB type (defined in gdbtypes.c) for the "standard" data type | |
1172 | of data in register regno. */ | |
1173 | ||
a78f21af | 1174 | static struct type * |
c1d546cd | 1175 | cris_register_type (struct gdbarch *gdbarch, int regno) |
29134980 OF |
1176 | { |
1177 | if (regno == SP_REGNUM || regno == PC_REGNUM | |
1178 | || (regno > P8_REGNUM && regno < USP_REGNUM)) | |
1179 | { | |
1180 | /* SP, PC, IBR, IRP, SRP, BAR, DCCR, BRP */ | |
1181 | return lookup_pointer_type (builtin_type_void); | |
1182 | } | |
1183 | else if (regno == P8_REGNUM || regno == USP_REGNUM | |
1184 | || (regno >= 0 && regno < SP_REGNUM)) | |
1185 | { | |
1186 | /* R0 - R13, P8, P15 */ | |
1187 | return builtin_type_unsigned_long; | |
1188 | } | |
2e4b5889 | 1189 | else if (regno > P3_REGNUM && regno < P8_REGNUM) |
29134980 | 1190 | { |
2e4b5889 OF |
1191 | /* P4, CCR, DCR0, DCR1 */ |
1192 | return builtin_type_unsigned_short; | |
29134980 | 1193 | } |
2e4b5889 | 1194 | else if (regno > PC_REGNUM && regno < P4_REGNUM) |
29134980 | 1195 | { |
2e4b5889 OF |
1196 | /* P0, P1, P2, P3 */ |
1197 | return builtin_type_unsigned_char; | |
29134980 OF |
1198 | } |
1199 | else | |
1200 | { | |
2e4b5889 OF |
1201 | /* Invalid register. */ |
1202 | return builtin_type_void; | |
29134980 OF |
1203 | } |
1204 | } | |
1205 | ||
2e4b5889 OF |
1206 | /* Stores a function return value of type type, where valbuf is the address |
1207 | of the value to be stored. */ | |
29134980 | 1208 | |
2e4b5889 | 1209 | /* In the CRIS ABI, R10 and R11 are used to store return values. */ |
29134980 | 1210 | |
2e4b5889 OF |
1211 | static void |
1212 | cris_store_return_value (struct type *type, struct regcache *regcache, | |
1213 | const void *valbuf) | |
29134980 | 1214 | { |
2e4b5889 OF |
1215 | ULONGEST val; |
1216 | int len = TYPE_LENGTH (type); | |
29134980 | 1217 | |
2e4b5889 | 1218 | if (len <= 4) |
29134980 | 1219 | { |
2e4b5889 OF |
1220 | /* Put the return value in R10. */ |
1221 | val = extract_unsigned_integer (valbuf, len); | |
1222 | regcache_cooked_write_unsigned (regcache, ARG1_REGNUM, val); | |
29134980 | 1223 | } |
2e4b5889 | 1224 | else if (len <= 8) |
29134980 | 1225 | { |
2e4b5889 OF |
1226 | /* Put the return value in R10 and R11. */ |
1227 | val = extract_unsigned_integer (valbuf, 4); | |
1228 | regcache_cooked_write_unsigned (regcache, ARG1_REGNUM, val); | |
1229 | val = extract_unsigned_integer ((char *)valbuf + 4, len - 4); | |
1230 | regcache_cooked_write_unsigned (regcache, ARG2_REGNUM, val); | |
29134980 | 1231 | } |
2e4b5889 OF |
1232 | else |
1233 | error ("cris_store_return_value: type length too large."); | |
29134980 OF |
1234 | } |
1235 | ||
2e4b5889 OF |
1236 | /* Return the name of register regno as a string. Return NULL for an invalid or |
1237 | unimplemented register. */ | |
29134980 | 1238 | |
2e4b5889 OF |
1239 | static const char * |
1240 | cris_register_name (int regno) | |
1241 | { | |
1242 | static char *cris_genreg_names[] = | |
1243 | { "r0", "r1", "r2", "r3", \ | |
1244 | "r4", "r5", "r6", "r7", \ | |
1245 | "r8", "r9", "r10", "r11", \ | |
1246 | "r12", "r13", "sp", "pc" }; | |
29134980 | 1247 | |
2e4b5889 OF |
1248 | int i; |
1249 | int spec_regno; | |
29134980 | 1250 | |
2e4b5889 | 1251 | if (regno >= 0 && regno < NUM_GENREGS) |
29134980 | 1252 | { |
2e4b5889 OF |
1253 | /* General register. */ |
1254 | return cris_genreg_names[regno]; | |
29134980 | 1255 | } |
2e4b5889 | 1256 | else if (regno >= NUM_GENREGS && regno < NUM_REGS) |
29134980 | 1257 | { |
2e4b5889 OF |
1258 | /* Special register (R16 - R31). cris_spec_regs is zero-based. |
1259 | Adjust regno accordingly. */ | |
1260 | spec_regno = regno - NUM_GENREGS; | |
29134980 | 1261 | |
2e4b5889 OF |
1262 | /* The entries in cris_spec_regs are stored in register number order, |
1263 | which means we can shortcut into the array when searching it. */ | |
1264 | for (i = spec_regno; cris_spec_regs[i].name != NULL; i++) | |
29134980 | 1265 | { |
2e4b5889 OF |
1266 | if (cris_spec_regs[i].number == spec_regno |
1267 | && cris_spec_reg_applicable (cris_spec_regs[i])) | |
1268 | /* Go with the first applicable register. */ | |
1269 | return cris_spec_regs[i].name; | |
29134980 | 1270 | } |
2e4b5889 OF |
1271 | /* Special register not applicable to this CRIS version. */ |
1272 | return NULL; | |
1273 | } | |
1274 | else | |
1275 | { | |
1276 | /* Invalid register. */ | |
1277 | return NULL; | |
29134980 | 1278 | } |
29134980 OF |
1279 | } |
1280 | ||
2e4b5889 OF |
1281 | static int |
1282 | cris_register_bytes_ok (long bytes) | |
29134980 | 1283 | { |
f42accbe | 1284 | return (bytes == deprecated_register_bytes ()); |
29134980 OF |
1285 | } |
1286 | ||
2e4b5889 OF |
1287 | /* Extract from an array regbuf containing the raw register state a function |
1288 | return value of type type, and copy that, in virtual format, into | |
1289 | valbuf. */ | |
1290 | ||
1291 | /* In the CRIS ABI, R10 and R11 are used to store return values. */ | |
29134980 | 1292 | |
2e4b5889 OF |
1293 | static void |
1294 | cris_extract_return_value (struct type *type, struct regcache *regcache, | |
1295 | void *valbuf) | |
29134980 | 1296 | { |
2e4b5889 OF |
1297 | ULONGEST val; |
1298 | int len = TYPE_LENGTH (type); | |
29134980 | 1299 | |
2e4b5889 | 1300 | if (len <= 4) |
29134980 | 1301 | { |
2e4b5889 OF |
1302 | /* Get the return value from R10. */ |
1303 | regcache_cooked_read_unsigned (regcache, ARG1_REGNUM, &val); | |
1304 | store_unsigned_integer (valbuf, len, val); | |
29134980 | 1305 | } |
2e4b5889 | 1306 | else if (len <= 8) |
29134980 | 1307 | { |
2e4b5889 OF |
1308 | /* Get the return value from R10 and R11. */ |
1309 | regcache_cooked_read_unsigned (regcache, ARG1_REGNUM, &val); | |
1310 | store_unsigned_integer (valbuf, 4, val); | |
1311 | regcache_cooked_read_unsigned (regcache, ARG2_REGNUM, &val); | |
1312 | store_unsigned_integer ((char *)valbuf + 4, len - 4, val); | |
29134980 | 1313 | } |
2e4b5889 OF |
1314 | else |
1315 | error ("cris_extract_return_value: type length too large"); | |
1316 | } | |
1317 | ||
b4206d25 OF |
1318 | /* Handle the CRIS return value convention. */ |
1319 | ||
1320 | static enum return_value_convention | |
1321 | cris_return_value (struct gdbarch *gdbarch, struct type *type, | |
1322 | struct regcache *regcache, void *readbuf, | |
1323 | const void *writebuf) | |
1324 | { | |
1325 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
1326 | || TYPE_CODE (type) == TYPE_CODE_UNION | |
1327 | || TYPE_LENGTH (type) > 8) | |
1328 | /* Structs, unions, and anything larger than 8 bytes (2 registers) | |
1329 | goes on the stack. */ | |
1330 | return RETURN_VALUE_STRUCT_CONVENTION; | |
1331 | ||
1332 | if (readbuf) | |
1333 | cris_extract_return_value (type, regcache, readbuf); | |
1334 | if (writebuf) | |
1335 | cris_store_return_value (type, regcache, writebuf); | |
1336 | ||
1337 | return RETURN_VALUE_REGISTER_CONVENTION; | |
1338 | } | |
1339 | ||
2e4b5889 OF |
1340 | /* Returns 1 if the given type will be passed by pointer rather than |
1341 | directly. */ | |
1342 | ||
1343 | /* In the CRIS ABI, arguments shorter than or equal to 64 bits are passed | |
1344 | by value. */ | |
1345 | ||
1346 | static int | |
1347 | cris_reg_struct_has_addr (int gcc_p, struct type *type) | |
1348 | { | |
1349 | return (TYPE_LENGTH (type) > 8); | |
29134980 OF |
1350 | } |
1351 | ||
1352 | /* Calculates a value that measures how good inst_args constraints an | |
1353 | instruction. It stems from cris_constraint, found in cris-dis.c. */ | |
1354 | ||
1355 | static int | |
1356 | constraint (unsigned int insn, const signed char *inst_args, | |
1357 | inst_env_type *inst_env) | |
1358 | { | |
1359 | int retval = 0; | |
1360 | int tmp, i; | |
1361 | ||
1362 | const char *s = inst_args; | |
1363 | ||
1364 | for (; *s; s++) | |
1365 | switch (*s) | |
1366 | { | |
1367 | case 'm': | |
1368 | if ((insn & 0x30) == 0x30) | |
1369 | return -1; | |
1370 | break; | |
1371 | ||
1372 | case 'S': | |
1373 | /* A prefix operand. */ | |
1374 | if (inst_env->prefix_found) | |
1375 | break; | |
1376 | else | |
1377 | return -1; | |
1378 | ||
1379 | case 'B': | |
1380 | /* A "push" prefix. (This check was REMOVED by san 970921.) Check for | |
1381 | valid "push" size. In case of special register, it may be != 4. */ | |
1382 | if (inst_env->prefix_found) | |
1383 | break; | |
1384 | else | |
1385 | return -1; | |
1386 | ||
1387 | case 'D': | |
1388 | retval = (((insn >> 0xC) & 0xF) == (insn & 0xF)); | |
1389 | if (!retval) | |
1390 | return -1; | |
1391 | else | |
1392 | retval += 4; | |
1393 | break; | |
1394 | ||
1395 | case 'P': | |
1396 | tmp = (insn >> 0xC) & 0xF; | |
fa4e4598 OF |
1397 | |
1398 | for (i = 0; cris_spec_regs[i].name != NULL; i++) | |
1399 | { | |
1400 | /* Since we match four bits, we will give a value of | |
1401 | 4 - 1 = 3 in a match. If there is a corresponding | |
1402 | exact match of a special register in another pattern, it | |
1403 | will get a value of 4, which will be higher. This should | |
1404 | be correct in that an exact pattern would match better that | |
1405 | a general pattern. | |
1406 | Note that there is a reason for not returning zero; the | |
1407 | pattern for "clear" is partly matched in the bit-pattern | |
1408 | (the two lower bits must be zero), while the bit-pattern | |
1409 | for a move from a special register is matched in the | |
1410 | register constraint. | |
1411 | This also means we will will have a race condition if | |
1412 | there is a partly match in three bits in the bit pattern. */ | |
1413 | if (tmp == cris_spec_regs[i].number) | |
1414 | { | |
1415 | retval += 3; | |
1416 | break; | |
1417 | } | |
1418 | } | |
1419 | ||
1420 | if (cris_spec_regs[i].name == NULL) | |
29134980 OF |
1421 | return -1; |
1422 | break; | |
1423 | } | |
1424 | return retval; | |
1425 | } | |
1426 | ||
1427 | /* Returns the number of bits set in the variable value. */ | |
1428 | ||
1429 | static int | |
1430 | number_of_bits (unsigned int value) | |
1431 | { | |
1432 | int number_of_bits = 0; | |
1433 | ||
1434 | while (value != 0) | |
1435 | { | |
1436 | number_of_bits += 1; | |
1437 | value &= (value - 1); | |
1438 | } | |
1439 | return number_of_bits; | |
1440 | } | |
1441 | ||
1442 | /* Finds the address that should contain the single step breakpoint(s). | |
1443 | It stems from code in cris-dis.c. */ | |
1444 | ||
1445 | static int | |
1446 | find_cris_op (unsigned short insn, inst_env_type *inst_env) | |
1447 | { | |
1448 | int i; | |
1449 | int max_level_of_match = -1; | |
1450 | int max_matched = -1; | |
1451 | int level_of_match; | |
1452 | ||
1453 | for (i = 0; cris_opcodes[i].name != NULL; i++) | |
1454 | { | |
1455 | if (((cris_opcodes[i].match & insn) == cris_opcodes[i].match) | |
1456 | && ((cris_opcodes[i].lose & insn) == 0)) | |
1457 | { | |
1458 | level_of_match = constraint (insn, cris_opcodes[i].args, inst_env); | |
1459 | if (level_of_match >= 0) | |
1460 | { | |
1461 | level_of_match += | |
1462 | number_of_bits (cris_opcodes[i].match | cris_opcodes[i].lose); | |
1463 | if (level_of_match > max_level_of_match) | |
1464 | { | |
1465 | max_matched = i; | |
1466 | max_level_of_match = level_of_match; | |
1467 | if (level_of_match == 16) | |
1468 | { | |
1469 | /* All bits matched, cannot find better. */ | |
1470 | break; | |
1471 | } | |
1472 | } | |
1473 | } | |
1474 | } | |
1475 | } | |
1476 | return max_matched; | |
1477 | } | |
1478 | ||
1479 | /* Attempts to find single-step breakpoints. Returns -1 on failure which is | |
1480 | actually an internal error. */ | |
1481 | ||
1482 | static int | |
1483 | find_step_target (inst_env_type *inst_env) | |
1484 | { | |
1485 | int i; | |
1486 | int offset; | |
1487 | unsigned short insn; | |
1488 | ||
1489 | /* Create a local register image and set the initial state. */ | |
1490 | for (i = 0; i < NUM_GENREGS; i++) | |
1491 | { | |
1492 | inst_env->reg[i] = (unsigned long) read_register (i); | |
1493 | } | |
1494 | offset = NUM_GENREGS; | |
1495 | for (i = 0; i < NUM_SPECREGS; i++) | |
1496 | { | |
1497 | inst_env->preg[i] = (unsigned long) read_register (offset + i); | |
1498 | } | |
1499 | inst_env->branch_found = 0; | |
1500 | inst_env->slot_needed = 0; | |
1501 | inst_env->delay_slot_pc_active = 0; | |
1502 | inst_env->prefix_found = 0; | |
1503 | inst_env->invalid = 0; | |
1504 | inst_env->xflag_found = 0; | |
1505 | inst_env->disable_interrupt = 0; | |
1506 | ||
1507 | /* Look for a step target. */ | |
1508 | do | |
1509 | { | |
1510 | /* Read an instruction from the client. */ | |
1511 | insn = read_memory_unsigned_integer (inst_env->reg[PC_REGNUM], 2); | |
1512 | ||
1513 | /* If the instruction is not in a delay slot the new content of the | |
1514 | PC is [PC] + 2. If the instruction is in a delay slot it is not | |
1515 | that simple. Since a instruction in a delay slot cannot change | |
1516 | the content of the PC, it does not matter what value PC will have. | |
1517 | Just make sure it is a valid instruction. */ | |
1518 | if (!inst_env->delay_slot_pc_active) | |
1519 | { | |
1520 | inst_env->reg[PC_REGNUM] += 2; | |
1521 | } | |
1522 | else | |
1523 | { | |
1524 | inst_env->delay_slot_pc_active = 0; | |
1525 | inst_env->reg[PC_REGNUM] = inst_env->delay_slot_pc; | |
1526 | } | |
1527 | /* Analyse the present instruction. */ | |
1528 | i = find_cris_op (insn, inst_env); | |
1529 | if (i == -1) | |
1530 | { | |
1531 | inst_env->invalid = 1; | |
1532 | } | |
1533 | else | |
1534 | { | |
1535 | cris_gdb_func (cris_opcodes[i].op, insn, inst_env); | |
1536 | } | |
1537 | } while (!inst_env->invalid | |
1538 | && (inst_env->prefix_found || inst_env->xflag_found | |
1539 | || inst_env->slot_needed)); | |
1540 | return i; | |
1541 | } | |
1542 | ||
1543 | /* There is no hardware single-step support. The function find_step_target | |
1544 | digs through the opcodes in order to find all possible targets. | |
1545 | Either one ordinary target or two targets for branches may be found. */ | |
1546 | ||
a78f21af | 1547 | static void |
29134980 OF |
1548 | cris_software_single_step (enum target_signal ignore, int insert_breakpoints) |
1549 | { | |
1550 | inst_env_type inst_env; | |
1551 | ||
1552 | if (insert_breakpoints) | |
1553 | { | |
1554 | /* Analyse the present instruction environment and insert | |
1555 | breakpoints. */ | |
1556 | int status = find_step_target (&inst_env); | |
1557 | if (status == -1) | |
1558 | { | |
1559 | /* Could not find a target. FIXME: Should do something. */ | |
1560 | } | |
1561 | else | |
1562 | { | |
1563 | /* Insert at most two breakpoints. One for the next PC content | |
1564 | and possibly another one for a branch, jump, etc. */ | |
1565 | next_pc = (CORE_ADDR) inst_env.reg[PC_REGNUM]; | |
1566 | target_insert_breakpoint (next_pc, break_mem[0]); | |
1567 | if (inst_env.branch_found | |
1568 | && (CORE_ADDR) inst_env.branch_break_address != next_pc) | |
1569 | { | |
1570 | branch_target_address = | |
1571 | (CORE_ADDR) inst_env.branch_break_address; | |
1572 | target_insert_breakpoint (branch_target_address, break_mem[1]); | |
1573 | branch_break_inserted = 1; | |
1574 | } | |
1575 | } | |
1576 | } | |
1577 | else | |
1578 | { | |
1579 | /* Remove breakpoints. */ | |
1580 | target_remove_breakpoint (next_pc, break_mem[0]); | |
1581 | if (branch_break_inserted) | |
1582 | { | |
1583 | target_remove_breakpoint (branch_target_address, break_mem[1]); | |
1584 | branch_break_inserted = 0; | |
1585 | } | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | /* Calculates the prefix value for quick offset addressing mode. */ | |
1590 | ||
a78f21af | 1591 | static void |
29134980 OF |
1592 | quick_mode_bdap_prefix (unsigned short inst, inst_env_type *inst_env) |
1593 | { | |
1594 | /* It's invalid to be in a delay slot. You can't have a prefix to this | |
1595 | instruction (not 100% sure). */ | |
1596 | if (inst_env->slot_needed || inst_env->prefix_found) | |
1597 | { | |
1598 | inst_env->invalid = 1; | |
1599 | return; | |
1600 | } | |
1601 | ||
1602 | inst_env->prefix_value = inst_env->reg[cris_get_operand2 (inst)]; | |
1603 | inst_env->prefix_value += cris_get_bdap_quick_offset (inst); | |
1604 | ||
1605 | /* A prefix doesn't change the xflag_found. But the rest of the flags | |
1606 | need updating. */ | |
1607 | inst_env->slot_needed = 0; | |
1608 | inst_env->prefix_found = 1; | |
1609 | } | |
1610 | ||
1611 | /* Updates the autoincrement register. The size of the increment is derived | |
1612 | from the size of the operation. The PC is always kept aligned on even | |
1613 | word addresses. */ | |
1614 | ||
a78f21af | 1615 | static void |
29134980 OF |
1616 | process_autoincrement (int size, unsigned short inst, inst_env_type *inst_env) |
1617 | { | |
1618 | if (size == INST_BYTE_SIZE) | |
1619 | { | |
1620 | inst_env->reg[cris_get_operand1 (inst)] += 1; | |
1621 | ||
1622 | /* The PC must be word aligned, so increase the PC with one | |
1623 | word even if the size is byte. */ | |
1624 | if (cris_get_operand1 (inst) == REG_PC) | |
1625 | { | |
1626 | inst_env->reg[REG_PC] += 1; | |
1627 | } | |
1628 | } | |
1629 | else if (size == INST_WORD_SIZE) | |
1630 | { | |
1631 | inst_env->reg[cris_get_operand1 (inst)] += 2; | |
1632 | } | |
1633 | else if (size == INST_DWORD_SIZE) | |
1634 | { | |
1635 | inst_env->reg[cris_get_operand1 (inst)] += 4; | |
1636 | } | |
1637 | else | |
1638 | { | |
1639 | /* Invalid size. */ | |
1640 | inst_env->invalid = 1; | |
1641 | } | |
1642 | } | |
1643 | ||
2a9ecef2 OF |
1644 | /* Just a forward declaration. */ |
1645 | ||
a78f21af AC |
1646 | static unsigned long get_data_from_address (unsigned short *inst, |
1647 | CORE_ADDR address); | |
2a9ecef2 | 1648 | |
29134980 OF |
1649 | /* Calculates the prefix value for the general case of offset addressing |
1650 | mode. */ | |
1651 | ||
a78f21af | 1652 | static void |
29134980 OF |
1653 | bdap_prefix (unsigned short inst, inst_env_type *inst_env) |
1654 | { | |
1655 | ||
1656 | long offset; | |
1657 | ||
1658 | /* It's invalid to be in a delay slot. */ | |
1659 | if (inst_env->slot_needed || inst_env->prefix_found) | |
1660 | { | |
1661 | inst_env->invalid = 1; | |
1662 | return; | |
1663 | } | |
1664 | ||
fa4e4598 OF |
1665 | /* The calculation of prefix_value used to be after process_autoincrement, |
1666 | but that fails for an instruction such as jsr [$r0+12] which is encoded | |
1667 | as 5f0d 0c00 30b9 when compiled with -fpic. Since PC is operand1 it | |
1668 | mustn't be incremented until we have read it and what it points at. */ | |
29134980 OF |
1669 | inst_env->prefix_value = inst_env->reg[cris_get_operand2 (inst)]; |
1670 | ||
1671 | /* The offset is an indirection of the contents of the operand1 register. */ | |
1672 | inst_env->prefix_value += | |
2a9ecef2 OF |
1673 | get_data_from_address (&inst, inst_env->reg[cris_get_operand1 (inst)]); |
1674 | ||
fa4e4598 OF |
1675 | if (cris_get_mode (inst) == AUTOINC_MODE) |
1676 | { | |
1677 | process_autoincrement (cris_get_size (inst), inst, inst_env); | |
1678 | } | |
1679 | ||
29134980 OF |
1680 | /* A prefix doesn't change the xflag_found. But the rest of the flags |
1681 | need updating. */ | |
1682 | inst_env->slot_needed = 0; | |
1683 | inst_env->prefix_found = 1; | |
1684 | } | |
1685 | ||
1686 | /* Calculates the prefix value for the index addressing mode. */ | |
1687 | ||
a78f21af | 1688 | static void |
29134980 OF |
1689 | biap_prefix (unsigned short inst, inst_env_type *inst_env) |
1690 | { | |
1691 | /* It's invalid to be in a delay slot. I can't see that it's possible to | |
1692 | have a prefix to this instruction. So I will treat this as invalid. */ | |
1693 | if (inst_env->slot_needed || inst_env->prefix_found) | |
1694 | { | |
1695 | inst_env->invalid = 1; | |
1696 | return; | |
1697 | } | |
1698 | ||
1699 | inst_env->prefix_value = inst_env->reg[cris_get_operand1 (inst)]; | |
1700 | ||
1701 | /* The offset is the operand2 value shifted the size of the instruction | |
1702 | to the left. */ | |
1703 | inst_env->prefix_value += | |
1704 | inst_env->reg[cris_get_operand2 (inst)] << cris_get_size (inst); | |
1705 | ||
1706 | /* If the PC is operand1 (base) the address used is the address after | |
1707 | the main instruction, i.e. address + 2 (the PC is already compensated | |
1708 | for the prefix operation). */ | |
1709 | if (cris_get_operand1 (inst) == REG_PC) | |
1710 | { | |
1711 | inst_env->prefix_value += 2; | |
1712 | } | |
1713 | ||
1714 | /* A prefix doesn't change the xflag_found. But the rest of the flags | |
1715 | need updating. */ | |
1716 | inst_env->slot_needed = 0; | |
1717 | inst_env->xflag_found = 0; | |
1718 | inst_env->prefix_found = 1; | |
1719 | } | |
1720 | ||
1721 | /* Calculates the prefix value for the double indirect addressing mode. */ | |
1722 | ||
a78f21af | 1723 | static void |
29134980 OF |
1724 | dip_prefix (unsigned short inst, inst_env_type *inst_env) |
1725 | { | |
1726 | ||
1727 | CORE_ADDR address; | |
1728 | ||
1729 | /* It's invalid to be in a delay slot. */ | |
1730 | if (inst_env->slot_needed || inst_env->prefix_found) | |
1731 | { | |
1732 | inst_env->invalid = 1; | |
1733 | return; | |
1734 | } | |
1735 | ||
1736 | /* The prefix value is one dereference of the contents of the operand1 | |
1737 | register. */ | |
1738 | address = (CORE_ADDR) inst_env->reg[cris_get_operand1 (inst)]; | |
1739 | inst_env->prefix_value = read_memory_unsigned_integer (address, 4); | |
1740 | ||
1741 | /* Check if the mode is autoincrement. */ | |
1742 | if (cris_get_mode (inst) == AUTOINC_MODE) | |
1743 | { | |
1744 | inst_env->reg[cris_get_operand1 (inst)] += 4; | |
1745 | } | |
1746 | ||
1747 | /* A prefix doesn't change the xflag_found. But the rest of the flags | |
1748 | need updating. */ | |
1749 | inst_env->slot_needed = 0; | |
1750 | inst_env->xflag_found = 0; | |
1751 | inst_env->prefix_found = 1; | |
1752 | } | |
1753 | ||
1754 | /* Finds the destination for a branch with 8-bits offset. */ | |
1755 | ||
a78f21af | 1756 | static void |
29134980 OF |
1757 | eight_bit_offset_branch_op (unsigned short inst, inst_env_type *inst_env) |
1758 | { | |
1759 | ||
1760 | short offset; | |
1761 | ||
1762 | /* If we have a prefix or are in a delay slot it's bad. */ | |
1763 | if (inst_env->slot_needed || inst_env->prefix_found) | |
1764 | { | |
1765 | inst_env->invalid = 1; | |
1766 | return; | |
1767 | } | |
1768 | ||
1769 | /* We have a branch, find out where the branch will land. */ | |
1770 | offset = cris_get_branch_short_offset (inst); | |
1771 | ||
1772 | /* Check if the offset is signed. */ | |
1773 | if (offset & BRANCH_SIGNED_SHORT_OFFSET_MASK) | |
1774 | { | |
1775 | offset |= 0xFF00; | |
1776 | } | |
1777 | ||
1778 | /* The offset ends with the sign bit, set it to zero. The address | |
1779 | should always be word aligned. */ | |
1780 | offset &= ~BRANCH_SIGNED_SHORT_OFFSET_MASK; | |
1781 | ||
1782 | inst_env->branch_found = 1; | |
1783 | inst_env->branch_break_address = inst_env->reg[REG_PC] + offset; | |
1784 | ||
1785 | inst_env->slot_needed = 1; | |
1786 | inst_env->prefix_found = 0; | |
1787 | inst_env->xflag_found = 0; | |
1788 | inst_env->disable_interrupt = 1; | |
1789 | } | |
1790 | ||
1791 | /* Finds the destination for a branch with 16-bits offset. */ | |
1792 | ||
a78f21af | 1793 | static void |
29134980 OF |
1794 | sixteen_bit_offset_branch_op (unsigned short inst, inst_env_type *inst_env) |
1795 | { | |
1796 | short offset; | |
1797 | ||
1798 | /* If we have a prefix or is in a delay slot it's bad. */ | |
1799 | if (inst_env->slot_needed || inst_env->prefix_found) | |
1800 | { | |
1801 | inst_env->invalid = 1; | |
1802 | return; | |
1803 | } | |
1804 | ||
1805 | /* We have a branch, find out the offset for the branch. */ | |
1806 | offset = read_memory_integer (inst_env->reg[REG_PC], 2); | |
1807 | ||
1808 | /* The instruction is one word longer than normal, so add one word | |
1809 | to the PC. */ | |
1810 | inst_env->reg[REG_PC] += 2; | |
1811 | ||
1812 | inst_env->branch_found = 1; | |
1813 | inst_env->branch_break_address = inst_env->reg[REG_PC] + offset; | |
1814 | ||
1815 | ||
1816 | inst_env->slot_needed = 1; | |
1817 | inst_env->prefix_found = 0; | |
1818 | inst_env->xflag_found = 0; | |
1819 | inst_env->disable_interrupt = 1; | |
1820 | } | |
1821 | ||
1822 | /* Handles the ABS instruction. */ | |
1823 | ||
a78f21af | 1824 | static void |
29134980 OF |
1825 | abs_op (unsigned short inst, inst_env_type *inst_env) |
1826 | { | |
1827 | ||
1828 | long value; | |
1829 | ||
1830 | /* ABS can't have a prefix, so it's bad if it does. */ | |
1831 | if (inst_env->prefix_found) | |
1832 | { | |
1833 | inst_env->invalid = 1; | |
1834 | return; | |
1835 | } | |
1836 | ||
1837 | /* Check if the operation affects the PC. */ | |
1838 | if (cris_get_operand2 (inst) == REG_PC) | |
1839 | { | |
1840 | ||
1841 | /* It's invalid to change to the PC if we are in a delay slot. */ | |
1842 | if (inst_env->slot_needed) | |
1843 | { | |
1844 | inst_env->invalid = 1; | |
1845 | return; | |
1846 | } | |
1847 | ||
1848 | value = (long) inst_env->reg[REG_PC]; | |
1849 | ||
1850 | /* The value of abs (SIGNED_DWORD_MASK) is SIGNED_DWORD_MASK. */ | |
1851 | if (value != SIGNED_DWORD_MASK) | |
1852 | { | |
1853 | value = -value; | |
1854 | inst_env->reg[REG_PC] = (long) value; | |
1855 | } | |
1856 | } | |
1857 | ||
1858 | inst_env->slot_needed = 0; | |
1859 | inst_env->prefix_found = 0; | |
1860 | inst_env->xflag_found = 0; | |
1861 | inst_env->disable_interrupt = 0; | |
1862 | } | |
1863 | ||
1864 | /* Handles the ADDI instruction. */ | |
1865 | ||
a78f21af | 1866 | static void |
29134980 OF |
1867 | addi_op (unsigned short inst, inst_env_type *inst_env) |
1868 | { | |
1869 | /* It's invalid to have the PC as base register. And ADDI can't have | |
1870 | a prefix. */ | |
1871 | if (inst_env->prefix_found || (cris_get_operand1 (inst) == REG_PC)) | |
1872 | { | |
1873 | inst_env->invalid = 1; | |
1874 | return; | |
1875 | } | |
1876 | ||
1877 | inst_env->slot_needed = 0; | |
1878 | inst_env->prefix_found = 0; | |
1879 | inst_env->xflag_found = 0; | |
1880 | inst_env->disable_interrupt = 0; | |
1881 | } | |
1882 | ||
1883 | /* Handles the ASR instruction. */ | |
1884 | ||
a78f21af | 1885 | static void |
29134980 OF |
1886 | asr_op (unsigned short inst, inst_env_type *inst_env) |
1887 | { | |
1888 | int shift_steps; | |
1889 | unsigned long value; | |
1890 | unsigned long signed_extend_mask = 0; | |
1891 | ||
1892 | /* ASR can't have a prefix, so check that it doesn't. */ | |
1893 | if (inst_env->prefix_found) | |
1894 | { | |
1895 | inst_env->invalid = 1; | |
1896 | return; | |
1897 | } | |
1898 | ||
1899 | /* Check if the PC is the target register. */ | |
1900 | if (cris_get_operand2 (inst) == REG_PC) | |
1901 | { | |
1902 | /* It's invalid to change the PC in a delay slot. */ | |
1903 | if (inst_env->slot_needed) | |
1904 | { | |
1905 | inst_env->invalid = 1; | |
1906 | return; | |
1907 | } | |
1908 | /* Get the number of bits to shift. */ | |
1909 | shift_steps = cris_get_asr_shift_steps (inst_env->reg[cris_get_operand1 (inst)]); | |
1910 | value = inst_env->reg[REG_PC]; | |
1911 | ||
1912 | /* Find out how many bits the operation should apply to. */ | |
1913 | if (cris_get_size (inst) == INST_BYTE_SIZE) | |
1914 | { | |
1915 | if (value & SIGNED_BYTE_MASK) | |
1916 | { | |
1917 | signed_extend_mask = 0xFF; | |
1918 | signed_extend_mask = signed_extend_mask >> shift_steps; | |
1919 | signed_extend_mask = ~signed_extend_mask; | |
1920 | } | |
1921 | value = value >> shift_steps; | |
1922 | value |= signed_extend_mask; | |
1923 | value &= 0xFF; | |
1924 | inst_env->reg[REG_PC] &= 0xFFFFFF00; | |
1925 | inst_env->reg[REG_PC] |= value; | |
1926 | } | |
1927 | else if (cris_get_size (inst) == INST_WORD_SIZE) | |
1928 | { | |
1929 | if (value & SIGNED_WORD_MASK) | |
1930 | { | |
1931 | signed_extend_mask = 0xFFFF; | |
1932 | signed_extend_mask = signed_extend_mask >> shift_steps; | |
1933 | signed_extend_mask = ~signed_extend_mask; | |
1934 | } | |
1935 | value = value >> shift_steps; | |
1936 | value |= signed_extend_mask; | |
1937 | value &= 0xFFFF; | |
1938 | inst_env->reg[REG_PC] &= 0xFFFF0000; | |
1939 | inst_env->reg[REG_PC] |= value; | |
1940 | } | |
1941 | else if (cris_get_size (inst) == INST_DWORD_SIZE) | |
1942 | { | |
1943 | if (value & SIGNED_DWORD_MASK) | |
1944 | { | |
1945 | signed_extend_mask = 0xFFFFFFFF; | |
1946 | signed_extend_mask = signed_extend_mask >> shift_steps; | |
1947 | signed_extend_mask = ~signed_extend_mask; | |
1948 | } | |
1949 | value = value >> shift_steps; | |
1950 | value |= signed_extend_mask; | |
1951 | inst_env->reg[REG_PC] = value; | |
1952 | } | |
1953 | } | |
1954 | inst_env->slot_needed = 0; | |
1955 | inst_env->prefix_found = 0; | |
1956 | inst_env->xflag_found = 0; | |
1957 | inst_env->disable_interrupt = 0; | |
1958 | } | |
1959 | ||
1960 | /* Handles the ASRQ instruction. */ | |
1961 | ||
a78f21af | 1962 | static void |
29134980 OF |
1963 | asrq_op (unsigned short inst, inst_env_type *inst_env) |
1964 | { | |
1965 | ||
1966 | int shift_steps; | |
1967 | unsigned long value; | |
1968 | unsigned long signed_extend_mask = 0; | |
1969 | ||
1970 | /* ASRQ can't have a prefix, so check that it doesn't. */ | |
1971 | if (inst_env->prefix_found) | |
1972 | { | |
1973 | inst_env->invalid = 1; | |
1974 | return; | |
1975 | } | |
1976 | ||
1977 | /* Check if the PC is the target register. */ | |
1978 | if (cris_get_operand2 (inst) == REG_PC) | |
1979 | { | |
1980 | ||
1981 | /* It's invalid to change the PC in a delay slot. */ | |
1982 | if (inst_env->slot_needed) | |
1983 | { | |
1984 | inst_env->invalid = 1; | |
1985 | return; | |
1986 | } | |
1987 | /* The shift size is given as a 5 bit quick value, i.e. we don't | |
1988 | want the the sign bit of the quick value. */ | |
1989 | shift_steps = cris_get_asr_shift_steps (inst); | |
1990 | value = inst_env->reg[REG_PC]; | |
1991 | if (value & SIGNED_DWORD_MASK) | |
1992 | { | |
1993 | signed_extend_mask = 0xFFFFFFFF; | |
1994 | signed_extend_mask = signed_extend_mask >> shift_steps; | |
1995 | signed_extend_mask = ~signed_extend_mask; | |
1996 | } | |
1997 | value = value >> shift_steps; | |
1998 | value |= signed_extend_mask; | |
1999 | inst_env->reg[REG_PC] = value; | |
2000 | } | |
2001 | inst_env->slot_needed = 0; | |
2002 | inst_env->prefix_found = 0; | |
2003 | inst_env->xflag_found = 0; | |
2004 | inst_env->disable_interrupt = 0; | |
2005 | } | |
2006 | ||
2007 | /* Handles the AX, EI and SETF instruction. */ | |
2008 | ||
a78f21af | 2009 | static void |
29134980 OF |
2010 | ax_ei_setf_op (unsigned short inst, inst_env_type *inst_env) |
2011 | { | |
2012 | if (inst_env->prefix_found) | |
2013 | { | |
2014 | inst_env->invalid = 1; | |
2015 | return; | |
2016 | } | |
2017 | /* Check if the instruction is setting the X flag. */ | |
2018 | if (cris_is_xflag_bit_on (inst)) | |
2019 | { | |
2020 | inst_env->xflag_found = 1; | |
2021 | } | |
2022 | else | |
2023 | { | |
2024 | inst_env->xflag_found = 0; | |
2025 | } | |
2026 | inst_env->slot_needed = 0; | |
2027 | inst_env->prefix_found = 0; | |
2028 | inst_env->disable_interrupt = 1; | |
2029 | } | |
2030 | ||
2031 | /* Checks if the instruction is in assign mode. If so, it updates the assign | |
2032 | register. Note that check_assign assumes that the caller has checked that | |
2033 | there is a prefix to this instruction. The mode check depends on this. */ | |
2034 | ||
a78f21af | 2035 | static void |
29134980 OF |
2036 | check_assign (unsigned short inst, inst_env_type *inst_env) |
2037 | { | |
2038 | /* Check if it's an assign addressing mode. */ | |
2039 | if (cris_get_mode (inst) == PREFIX_ASSIGN_MODE) | |
2040 | { | |
2041 | /* Assign the prefix value to operand 1. */ | |
2042 | inst_env->reg[cris_get_operand1 (inst)] = inst_env->prefix_value; | |
2043 | } | |
2044 | } | |
2045 | ||
2046 | /* Handles the 2-operand BOUND instruction. */ | |
2047 | ||
a78f21af | 2048 | static void |
29134980 OF |
2049 | two_operand_bound_op (unsigned short inst, inst_env_type *inst_env) |
2050 | { | |
2051 | /* It's invalid to have the PC as the index operand. */ | |
2052 | if (cris_get_operand2 (inst) == REG_PC) | |
2053 | { | |
2054 | inst_env->invalid = 1; | |
2055 | return; | |
2056 | } | |
2057 | /* Check if we have a prefix. */ | |
2058 | if (inst_env->prefix_found) | |
2059 | { | |
2060 | check_assign (inst, inst_env); | |
2061 | } | |
2062 | /* Check if this is an autoincrement mode. */ | |
2063 | else if (cris_get_mode (inst) == AUTOINC_MODE) | |
2064 | { | |
2065 | /* It's invalid to change the PC in a delay slot. */ | |
2066 | if (inst_env->slot_needed) | |
2067 | { | |
2068 | inst_env->invalid = 1; | |
2069 | return; | |
2070 | } | |
2071 | process_autoincrement (cris_get_size (inst), inst, inst_env); | |
2072 | } | |
2073 | inst_env->slot_needed = 0; | |
2074 | inst_env->prefix_found = 0; | |
2075 | inst_env->xflag_found = 0; | |
2076 | inst_env->disable_interrupt = 0; | |
2077 | } | |
2078 | ||
2079 | /* Handles the 3-operand BOUND instruction. */ | |
2080 | ||
a78f21af | 2081 | static void |
29134980 OF |
2082 | three_operand_bound_op (unsigned short inst, inst_env_type *inst_env) |
2083 | { | |
2084 | /* It's an error if we haven't got a prefix. And it's also an error | |
2085 | if the PC is the destination register. */ | |
2086 | if ((!inst_env->prefix_found) || (cris_get_operand1 (inst) == REG_PC)) | |
2087 | { | |
2088 | inst_env->invalid = 1; | |
2089 | return; | |
2090 | } | |
2091 | inst_env->slot_needed = 0; | |
2092 | inst_env->prefix_found = 0; | |
2093 | inst_env->xflag_found = 0; | |
2094 | inst_env->disable_interrupt = 0; | |
2095 | } | |
2096 | ||
2097 | /* Clears the status flags in inst_env. */ | |
2098 | ||
a78f21af | 2099 | static void |
29134980 OF |
2100 | btst_nop_op (unsigned short inst, inst_env_type *inst_env) |
2101 | { | |
2102 | /* It's an error if we have got a prefix. */ | |
2103 | if (inst_env->prefix_found) | |
2104 | { | |
2105 | inst_env->invalid = 1; | |
2106 | return; | |
2107 | } | |
2108 | ||
2109 | inst_env->slot_needed = 0; | |
2110 | inst_env->prefix_found = 0; | |
2111 | inst_env->xflag_found = 0; | |
2112 | inst_env->disable_interrupt = 0; | |
2113 | } | |
2114 | ||
2115 | /* Clears the status flags in inst_env. */ | |
2116 | ||
a78f21af | 2117 | static void |
29134980 OF |
2118 | clearf_di_op (unsigned short inst, inst_env_type *inst_env) |
2119 | { | |
2120 | /* It's an error if we have got a prefix. */ | |
2121 | if (inst_env->prefix_found) | |
2122 | { | |
2123 | inst_env->invalid = 1; | |
2124 | return; | |
2125 | } | |
2126 | ||
2127 | inst_env->slot_needed = 0; | |
2128 | inst_env->prefix_found = 0; | |
2129 | inst_env->xflag_found = 0; | |
2130 | inst_env->disable_interrupt = 1; | |
2131 | } | |
2132 | ||
2133 | /* Handles the CLEAR instruction if it's in register mode. */ | |
2134 | ||
a78f21af | 2135 | static void |
29134980 OF |
2136 | reg_mode_clear_op (unsigned short inst, inst_env_type *inst_env) |
2137 | { | |
2138 | /* Check if the target is the PC. */ | |
2139 | if (cris_get_operand2 (inst) == REG_PC) | |
2140 | { | |
2141 | /* The instruction will clear the instruction's size bits. */ | |
2142 | int clear_size = cris_get_clear_size (inst); | |
2143 | if (clear_size == INST_BYTE_SIZE) | |
2144 | { | |
2145 | inst_env->delay_slot_pc = inst_env->reg[REG_PC] & 0xFFFFFF00; | |
2146 | } | |
2147 | if (clear_size == INST_WORD_SIZE) | |
2148 | { | |
2149 | inst_env->delay_slot_pc = inst_env->reg[REG_PC] & 0xFFFF0000; | |
2150 | } | |
2151 | if (clear_size == INST_DWORD_SIZE) | |
2152 | { | |
2153 | inst_env->delay_slot_pc = 0x0; | |
2154 | } | |
2155 | /* The jump will be delayed with one delay slot. So we need a delay | |
2156 | slot. */ | |
2157 | inst_env->slot_needed = 1; | |
2158 | inst_env->delay_slot_pc_active = 1; | |
2159 | } | |
2160 | else | |
2161 | { | |
2162 | /* The PC will not change => no delay slot. */ | |
2163 | inst_env->slot_needed = 0; | |
2164 | } | |
2165 | inst_env->prefix_found = 0; | |
2166 | inst_env->xflag_found = 0; | |
2167 | inst_env->disable_interrupt = 0; | |
2168 | } | |
2169 | ||
2170 | /* Handles the TEST instruction if it's in register mode. */ | |
2171 | ||
a78f21af | 2172 | static void |
29134980 OF |
2173 | reg_mode_test_op (unsigned short inst, inst_env_type *inst_env) |
2174 | { | |
2175 | /* It's an error if we have got a prefix. */ | |
2176 | if (inst_env->prefix_found) | |
2177 | { | |
2178 | inst_env->invalid = 1; | |
2179 | return; | |
2180 | } | |
2181 | inst_env->slot_needed = 0; | |
2182 | inst_env->prefix_found = 0; | |
2183 | inst_env->xflag_found = 0; | |
2184 | inst_env->disable_interrupt = 0; | |
2185 | ||
2186 | } | |
2187 | ||
2188 | /* Handles the CLEAR and TEST instruction if the instruction isn't | |
2189 | in register mode. */ | |
2190 | ||
a78f21af | 2191 | static void |
29134980 OF |
2192 | none_reg_mode_clear_test_op (unsigned short inst, inst_env_type *inst_env) |
2193 | { | |
2194 | /* Check if we are in a prefix mode. */ | |
2195 | if (inst_env->prefix_found) | |
2196 | { | |
2197 | /* The only way the PC can change is if this instruction is in | |
2198 | assign addressing mode. */ | |
2199 | check_assign (inst, inst_env); | |
2200 | } | |
2201 | /* Indirect mode can't change the PC so just check if the mode is | |
2202 | autoincrement. */ | |
2203 | else if (cris_get_mode (inst) == AUTOINC_MODE) | |
2204 | { | |
2205 | process_autoincrement (cris_get_size (inst), inst, inst_env); | |
2206 | } | |
2207 | inst_env->slot_needed = 0; | |
2208 | inst_env->prefix_found = 0; | |
2209 | inst_env->xflag_found = 0; | |
2210 | inst_env->disable_interrupt = 0; | |
2211 | } | |
2212 | ||
2213 | /* Checks that the PC isn't the destination register or the instructions has | |
2214 | a prefix. */ | |
2215 | ||
a78f21af | 2216 | static void |
29134980 OF |
2217 | dstep_logshift_mstep_neg_not_op (unsigned short inst, inst_env_type *inst_env) |
2218 | { | |
2219 | /* It's invalid to have the PC as the destination. The instruction can't | |
2220 | have a prefix. */ | |
2221 | if ((cris_get_operand2 (inst) == REG_PC) || inst_env->prefix_found) | |
2222 | { | |
2223 | inst_env->invalid = 1; | |
2224 | return; | |
2225 | } | |
2226 | ||
2227 | inst_env->slot_needed = 0; | |
2228 | inst_env->prefix_found = 0; | |
2229 | inst_env->xflag_found = 0; | |
2230 | inst_env->disable_interrupt = 0; | |
2231 | } | |
2232 | ||
2233 | /* Checks that the instruction doesn't have a prefix. */ | |
2234 | ||
a78f21af | 2235 | static void |
29134980 OF |
2236 | break_op (unsigned short inst, inst_env_type *inst_env) |
2237 | { | |
2238 | /* The instruction can't have a prefix. */ | |
2239 | if (inst_env->prefix_found) | |
2240 | { | |
2241 | inst_env->invalid = 1; | |
2242 | return; | |
2243 | } | |
2244 | ||
2245 | inst_env->slot_needed = 0; | |
2246 | inst_env->prefix_found = 0; | |
2247 | inst_env->xflag_found = 0; | |
2248 | inst_env->disable_interrupt = 1; | |
2249 | } | |
2250 | ||
2251 | /* Checks that the PC isn't the destination register and that the instruction | |
2252 | doesn't have a prefix. */ | |
2253 | ||
a78f21af | 2254 | static void |
29134980 OF |
2255 | scc_op (unsigned short inst, inst_env_type *inst_env) |
2256 | { | |
2257 | /* It's invalid to have the PC as the destination. The instruction can't | |
2258 | have a prefix. */ | |
2259 | if ((cris_get_operand2 (inst) == REG_PC) || inst_env->prefix_found) | |
2260 | { | |
2261 | inst_env->invalid = 1; | |
2262 | return; | |
2263 | } | |
2264 | ||
2265 | inst_env->slot_needed = 0; | |
2266 | inst_env->prefix_found = 0; | |
2267 | inst_env->xflag_found = 0; | |
2268 | inst_env->disable_interrupt = 1; | |
2269 | } | |
2270 | ||
2271 | /* Handles the register mode JUMP instruction. */ | |
2272 | ||
a78f21af | 2273 | static void |
29134980 OF |
2274 | reg_mode_jump_op (unsigned short inst, inst_env_type *inst_env) |
2275 | { | |
2276 | /* It's invalid to do a JUMP in a delay slot. The mode is register, so | |
2277 | you can't have a prefix. */ | |
2278 | if ((inst_env->slot_needed) || (inst_env->prefix_found)) | |
2279 | { | |
2280 | inst_env->invalid = 1; | |
2281 | return; | |
2282 | } | |
2283 | ||
2284 | /* Just change the PC. */ | |
2285 | inst_env->reg[REG_PC] = inst_env->reg[cris_get_operand1 (inst)]; | |
2286 | inst_env->slot_needed = 0; | |
2287 | inst_env->prefix_found = 0; | |
2288 | inst_env->xflag_found = 0; | |
2289 | inst_env->disable_interrupt = 1; | |
2290 | } | |
2291 | ||
2292 | /* Handles the JUMP instruction for all modes except register. */ | |
2293 | ||
a78f21af AC |
2294 | static void |
2295 | none_reg_mode_jump_op (unsigned short inst, inst_env_type *inst_env) | |
29134980 OF |
2296 | { |
2297 | unsigned long newpc; | |
2298 | CORE_ADDR address; | |
2299 | ||
2300 | /* It's invalid to do a JUMP in a delay slot. */ | |
2301 | if (inst_env->slot_needed) | |
2302 | { | |
2303 | inst_env->invalid = 1; | |
2304 | } | |
2305 | else | |
2306 | { | |
2307 | /* Check if we have a prefix. */ | |
2308 | if (inst_env->prefix_found) | |
2309 | { | |
2310 | check_assign (inst, inst_env); | |
2311 | ||
2312 | /* Get the new value for the the PC. */ | |
2313 | newpc = | |
2314 | read_memory_unsigned_integer ((CORE_ADDR) inst_env->prefix_value, | |
2315 | 4); | |
2316 | } | |
2317 | else | |
2318 | { | |
2319 | /* Get the new value for the PC. */ | |
2320 | address = (CORE_ADDR) inst_env->reg[cris_get_operand1 (inst)]; | |
2321 | newpc = read_memory_unsigned_integer (address, 4); | |
2322 | ||
2323 | /* Check if we should increment a register. */ | |
2324 | if (cris_get_mode (inst) == AUTOINC_MODE) | |
2325 | { | |
2326 | inst_env->reg[cris_get_operand1 (inst)] += 4; | |
2327 | } | |
2328 | } | |
2329 | inst_env->reg[REG_PC] = newpc; | |
2330 | } | |
2331 | inst_env->slot_needed = 0; | |
2332 | inst_env->prefix_found = 0; | |
2333 | inst_env->xflag_found = 0; | |
2334 | inst_env->disable_interrupt = 1; | |
2335 | } | |
2336 | ||
2337 | /* Handles moves to special registers (aka P-register) for all modes. */ | |
2338 | ||
a78f21af | 2339 | static void |
29134980 OF |
2340 | move_to_preg_op (unsigned short inst, inst_env_type *inst_env) |
2341 | { | |
2342 | if (inst_env->prefix_found) | |
2343 | { | |
2344 | /* The instruction has a prefix that means we are only interested if | |
2345 | the instruction is in assign mode. */ | |
2346 | if (cris_get_mode (inst) == PREFIX_ASSIGN_MODE) | |
2347 | { | |
2348 | /* The prefix handles the problem if we are in a delay slot. */ | |
2349 | if (cris_get_operand1 (inst) == REG_PC) | |
2350 | { | |
2351 | /* Just take care of the assign. */ | |
2352 | check_assign (inst, inst_env); | |
2353 | } | |
2354 | } | |
2355 | } | |
2356 | else if (cris_get_mode (inst) == AUTOINC_MODE) | |
2357 | { | |
2358 | /* The instruction doesn't have a prefix, the only case left that we | |
2359 | are interested in is the autoincrement mode. */ | |
2360 | if (cris_get_operand1 (inst) == REG_PC) | |
2361 | { | |
2362 | /* If the PC is to be incremented it's invalid to be in a | |
2363 | delay slot. */ | |
2364 | if (inst_env->slot_needed) | |
2365 | { | |
2366 | inst_env->invalid = 1; | |
2367 | return; | |
2368 | } | |
2a9ecef2 OF |
2369 | |
2370 | /* The increment depends on the size of the special register. */ | |
2371 | if (cris_register_size (cris_get_operand2 (inst)) == 1) | |
29134980 OF |
2372 | { |
2373 | process_autoincrement (INST_BYTE_SIZE, inst, inst_env); | |
2374 | } | |
2a9ecef2 | 2375 | else if (cris_register_size (cris_get_operand2 (inst)) == 2) |
29134980 OF |
2376 | { |
2377 | process_autoincrement (INST_WORD_SIZE, inst, inst_env); | |
2378 | } | |
2379 | else | |
2380 | { | |
2381 | process_autoincrement (INST_DWORD_SIZE, inst, inst_env); | |
2382 | } | |
2383 | } | |
2384 | } | |
2385 | inst_env->slot_needed = 0; | |
2386 | inst_env->prefix_found = 0; | |
2387 | inst_env->xflag_found = 0; | |
2388 | inst_env->disable_interrupt = 1; | |
2389 | } | |
2390 | ||
2391 | /* Handles moves from special registers (aka P-register) for all modes | |
2392 | except register. */ | |
2393 | ||
a78f21af | 2394 | static void |
29134980 OF |
2395 | none_reg_mode_move_from_preg_op (unsigned short inst, inst_env_type *inst_env) |
2396 | { | |
2397 | if (inst_env->prefix_found) | |
2398 | { | |
2399 | /* The instruction has a prefix that means we are only interested if | |
2400 | the instruction is in assign mode. */ | |
2401 | if (cris_get_mode (inst) == PREFIX_ASSIGN_MODE) | |
2402 | { | |
2403 | /* The prefix handles the problem if we are in a delay slot. */ | |
2404 | if (cris_get_operand1 (inst) == REG_PC) | |
2405 | { | |
2406 | /* Just take care of the assign. */ | |
2407 | check_assign (inst, inst_env); | |
2408 | } | |
2409 | } | |
2410 | } | |
2411 | /* The instruction doesn't have a prefix, the only case left that we | |
2412 | are interested in is the autoincrement mode. */ | |
2413 | else if (cris_get_mode (inst) == AUTOINC_MODE) | |
2414 | { | |
2415 | if (cris_get_operand1 (inst) == REG_PC) | |
2416 | { | |
2417 | /* If the PC is to be incremented it's invalid to be in a | |
2418 | delay slot. */ | |
2419 | if (inst_env->slot_needed) | |
2420 | { | |
2421 | inst_env->invalid = 1; | |
2422 | return; | |
2423 | } | |
2a9ecef2 OF |
2424 | |
2425 | /* The increment depends on the size of the special register. */ | |
2426 | if (cris_register_size (cris_get_operand2 (inst)) == 1) | |
29134980 OF |
2427 | { |
2428 | process_autoincrement (INST_BYTE_SIZE, inst, inst_env); | |
2429 | } | |
2a9ecef2 | 2430 | else if (cris_register_size (cris_get_operand2 (inst)) == 2) |
29134980 OF |
2431 | { |
2432 | process_autoincrement (INST_WORD_SIZE, inst, inst_env); | |
2433 | } | |
2434 | else | |
2435 | { | |
2436 | process_autoincrement (INST_DWORD_SIZE, inst, inst_env); | |
2437 | } | |
2438 | } | |
2439 | } | |
2440 | inst_env->slot_needed = 0; | |
2441 | inst_env->prefix_found = 0; | |
2442 | inst_env->xflag_found = 0; | |
2443 | inst_env->disable_interrupt = 1; | |
2444 | } | |
2445 | ||
2446 | /* Handles moves from special registers (aka P-register) when the mode | |
2447 | is register. */ | |
2448 | ||
a78f21af | 2449 | static void |
29134980 OF |
2450 | reg_mode_move_from_preg_op (unsigned short inst, inst_env_type *inst_env) |
2451 | { | |
2452 | /* Register mode move from special register can't have a prefix. */ | |
2453 | if (inst_env->prefix_found) | |
2454 | { | |
2455 | inst_env->invalid = 1; | |
2456 | return; | |
2457 | } | |
2458 | ||
2459 | if (cris_get_operand1 (inst) == REG_PC) | |
2460 | { | |
2461 | /* It's invalid to change the PC in a delay slot. */ | |
2462 | if (inst_env->slot_needed) | |
2463 | { | |
2464 | inst_env->invalid = 1; | |
2465 | return; | |
2466 | } | |
2467 | /* The destination is the PC, the jump will have a delay slot. */ | |
2468 | inst_env->delay_slot_pc = inst_env->preg[cris_get_operand2 (inst)]; | |
2469 | inst_env->slot_needed = 1; | |
2470 | inst_env->delay_slot_pc_active = 1; | |
2471 | } | |
2472 | else | |
2473 | { | |
2474 | /* If the destination isn't PC, there will be no jump. */ | |
2475 | inst_env->slot_needed = 0; | |
2476 | } | |
2477 | inst_env->prefix_found = 0; | |
2478 | inst_env->xflag_found = 0; | |
2479 | inst_env->disable_interrupt = 1; | |
2480 | } | |
2481 | ||
2482 | /* Handles the MOVEM from memory to general register instruction. */ | |
2483 | ||
a78f21af | 2484 | static void |
29134980 OF |
2485 | move_mem_to_reg_movem_op (unsigned short inst, inst_env_type *inst_env) |
2486 | { | |
2487 | if (inst_env->prefix_found) | |
2488 | { | |
2489 | /* The prefix handles the problem if we are in a delay slot. Is the | |
2490 | MOVEM instruction going to change the PC? */ | |
2491 | if (cris_get_operand2 (inst) >= REG_PC) | |
2492 | { | |
2493 | inst_env->reg[REG_PC] = | |
2494 | read_memory_unsigned_integer (inst_env->prefix_value, 4); | |
2495 | } | |
2496 | /* The assign value is the value after the increment. Normally, the | |
2497 | assign value is the value before the increment. */ | |
2498 | if ((cris_get_operand1 (inst) == REG_PC) | |
2499 | && (cris_get_mode (inst) == PREFIX_ASSIGN_MODE)) | |
2500 | { | |
2501 | inst_env->reg[REG_PC] = inst_env->prefix_value; | |
2502 | inst_env->reg[REG_PC] += 4 * (cris_get_operand2 (inst) + 1); | |
2503 | } | |
2504 | } | |
2505 | else | |
2506 | { | |
2507 | /* Is the MOVEM instruction going to change the PC? */ | |
2508 | if (cris_get_operand2 (inst) == REG_PC) | |
2509 | { | |
2510 | /* It's invalid to change the PC in a delay slot. */ | |
2511 | if (inst_env->slot_needed) | |
2512 | { | |
2513 | inst_env->invalid = 1; | |
2514 | return; | |
2515 | } | |
2516 | inst_env->reg[REG_PC] = | |
2517 | read_memory_unsigned_integer (inst_env->reg[cris_get_operand1 (inst)], | |
2518 | 4); | |
2519 | } | |
2520 | /* The increment is not depending on the size, instead it's depending | |
2521 | on the number of registers loaded from memory. */ | |
2522 | if ((cris_get_operand1 (inst) == REG_PC) && (cris_get_mode (inst) == AUTOINC_MODE)) | |
2523 | { | |
2524 | /* It's invalid to change the PC in a delay slot. */ | |
2525 | if (inst_env->slot_needed) | |
2526 | { | |
2527 | inst_env->invalid = 1; | |
2528 | return; | |
2529 | } | |
2530 | inst_env->reg[REG_PC] += 4 * (cris_get_operand2 (inst) + 1); | |
2531 | } | |
2532 | } | |
2533 | inst_env->slot_needed = 0; | |
2534 | inst_env->prefix_found = 0; | |
2535 | inst_env->xflag_found = 0; | |
2536 | inst_env->disable_interrupt = 0; | |
2537 | } | |
2538 | ||
2539 | /* Handles the MOVEM to memory from general register instruction. */ | |
2540 | ||
a78f21af | 2541 | static void |
29134980 OF |
2542 | move_reg_to_mem_movem_op (unsigned short inst, inst_env_type *inst_env) |
2543 | { | |
2544 | if (inst_env->prefix_found) | |
2545 | { | |
2546 | /* The assign value is the value after the increment. Normally, the | |
2547 | assign value is the value before the increment. */ | |
2548 | if ((cris_get_operand1 (inst) == REG_PC) && | |
2549 | (cris_get_mode (inst) == PREFIX_ASSIGN_MODE)) | |
2550 | { | |
2551 | /* The prefix handles the problem if we are in a delay slot. */ | |
2552 | inst_env->reg[REG_PC] = inst_env->prefix_value; | |
2553 | inst_env->reg[REG_PC] += 4 * (cris_get_operand2 (inst) + 1); | |
2554 | } | |
2555 | } | |
2556 | else | |
2557 | { | |
2558 | /* The increment is not depending on the size, instead it's depending | |
2559 | on the number of registers loaded to memory. */ | |
2560 | if ((cris_get_operand1 (inst) == REG_PC) && (cris_get_mode (inst) == AUTOINC_MODE)) | |
2561 | { | |
2562 | /* It's invalid to change the PC in a delay slot. */ | |
2563 | if (inst_env->slot_needed) | |
2564 | { | |
2565 | inst_env->invalid = 1; | |
2566 | return; | |
2567 | } | |
2568 | inst_env->reg[REG_PC] += 4 * (cris_get_operand2 (inst) + 1); | |
2569 | } | |
2570 | } | |
2571 | inst_env->slot_needed = 0; | |
2572 | inst_env->prefix_found = 0; | |
2573 | inst_env->xflag_found = 0; | |
2574 | inst_env->disable_interrupt = 0; | |
2575 | } | |
2576 | ||
29134980 OF |
2577 | /* Handles the intructions that's not yet implemented, by setting |
2578 | inst_env->invalid to true. */ | |
2579 | ||
a78f21af | 2580 | static void |
29134980 OF |
2581 | not_implemented_op (unsigned short inst, inst_env_type *inst_env) |
2582 | { | |
2583 | inst_env->invalid = 1; | |
2584 | } | |
2585 | ||
2586 | /* Handles the XOR instruction. */ | |
2587 | ||
a78f21af | 2588 | static void |
29134980 OF |
2589 | xor_op (unsigned short inst, inst_env_type *inst_env) |
2590 | { | |
2591 | /* XOR can't have a prefix. */ | |
2592 | if (inst_env->prefix_found) | |
2593 | { | |
2594 | inst_env->invalid = 1; | |
2595 | return; | |
2596 | } | |
2597 | ||
2598 | /* Check if the PC is the target. */ | |
2599 | if (cris_get_operand2 (inst) == REG_PC) | |
2600 | { | |
2601 | /* It's invalid to change the PC in a delay slot. */ | |
2602 | if (inst_env->slot_needed) | |
2603 | { | |
2604 | inst_env->invalid = 1; | |
2605 | return; | |
2606 | } | |
2607 | inst_env->reg[REG_PC] ^= inst_env->reg[cris_get_operand1 (inst)]; | |
2608 | } | |
2609 | inst_env->slot_needed = 0; | |
2610 | inst_env->prefix_found = 0; | |
2611 | inst_env->xflag_found = 0; | |
2612 | inst_env->disable_interrupt = 0; | |
2613 | } | |
2614 | ||
2615 | /* Handles the MULS instruction. */ | |
2616 | ||
a78f21af | 2617 | static void |
29134980 OF |
2618 | muls_op (unsigned short inst, inst_env_type *inst_env) |
2619 | { | |
2620 | /* MULS/U can't have a prefix. */ | |
2621 | if (inst_env->prefix_found) | |
2622 | { | |
2623 | inst_env->invalid = 1; | |
2624 | return; | |
2625 | } | |
2626 | ||
2627 | /* Consider it invalid if the PC is the target. */ | |
2628 | if (cris_get_operand2 (inst) == REG_PC) | |
2629 | { | |
2630 | inst_env->invalid = 1; | |
2631 | return; | |
2632 | } | |
2633 | inst_env->slot_needed = 0; | |
2634 | inst_env->prefix_found = 0; | |
2635 | inst_env->xflag_found = 0; | |
2636 | inst_env->disable_interrupt = 0; | |
2637 | } | |
2638 | ||
2639 | /* Handles the MULU instruction. */ | |
2640 | ||
a78f21af | 2641 | static void |
29134980 OF |
2642 | mulu_op (unsigned short inst, inst_env_type *inst_env) |
2643 | { | |
2644 | /* MULS/U can't have a prefix. */ | |
2645 | if (inst_env->prefix_found) | |
2646 | { | |
2647 | inst_env->invalid = 1; | |
2648 | return; | |
2649 | } | |
2650 | ||
2651 | /* Consider it invalid if the PC is the target. */ | |
2652 | if (cris_get_operand2 (inst) == REG_PC) | |
2653 | { | |
2654 | inst_env->invalid = 1; | |
2655 | return; | |
2656 | } | |
2657 | inst_env->slot_needed = 0; | |
2658 | inst_env->prefix_found = 0; | |
2659 | inst_env->xflag_found = 0; | |
2660 | inst_env->disable_interrupt = 0; | |
2661 | } | |
2662 | ||
2663 | /* Calculate the result of the instruction for ADD, SUB, CMP AND, OR and MOVE. | |
2664 | The MOVE instruction is the move from source to register. */ | |
2665 | ||
a78f21af | 2666 | static void |
29134980 OF |
2667 | add_sub_cmp_and_or_move_action (unsigned short inst, inst_env_type *inst_env, |
2668 | unsigned long source1, unsigned long source2) | |
2669 | { | |
2670 | unsigned long pc_mask; | |
2671 | unsigned long operation_mask; | |
2672 | ||
2673 | /* Find out how many bits the operation should apply to. */ | |
2674 | if (cris_get_size (inst) == INST_BYTE_SIZE) | |
2675 | { | |
2676 | pc_mask = 0xFFFFFF00; | |
2677 | operation_mask = 0xFF; | |
2678 | } | |
2679 | else if (cris_get_size (inst) == INST_WORD_SIZE) | |
2680 | { | |
2681 | pc_mask = 0xFFFF0000; | |
2682 | operation_mask = 0xFFFF; | |
2683 | } | |
2684 | else if (cris_get_size (inst) == INST_DWORD_SIZE) | |
2685 | { | |
2686 | pc_mask = 0x0; | |
2687 | operation_mask = 0xFFFFFFFF; | |
2688 | } | |
2689 | else | |
2690 | { | |
2691 | /* The size is out of range. */ | |
2692 | inst_env->invalid = 1; | |
2693 | return; | |
2694 | } | |
2695 | ||
2696 | /* The instruction just works on uw_operation_mask bits. */ | |
2697 | source2 &= operation_mask; | |
2698 | source1 &= operation_mask; | |
2699 | ||
2700 | /* Now calculate the result. The opcode's 3 first bits separates | |
2701 | the different actions. */ | |
2702 | switch (cris_get_opcode (inst) & 7) | |
2703 | { | |
2704 | case 0: /* add */ | |
2705 | source1 += source2; | |
2706 | break; | |
2707 | ||
2708 | case 1: /* move */ | |
2709 | source1 = source2; | |
2710 | break; | |
2711 | ||
2712 | case 2: /* subtract */ | |
2713 | source1 -= source2; | |
2714 | break; | |
2715 | ||
2716 | case 3: /* compare */ | |
2717 | break; | |
2718 | ||
2719 | case 4: /* and */ | |
2720 | source1 &= source2; | |
2721 | break; | |
2722 | ||
2723 | case 5: /* or */ | |
2724 | source1 |= source2; | |
2725 | break; | |
2726 | ||
2727 | default: | |
2728 | inst_env->invalid = 1; | |
2729 | return; | |
2730 | ||
2731 | break; | |
2732 | } | |
2733 | ||
2734 | /* Make sure that the result doesn't contain more than the instruction | |
2735 | size bits. */ | |
2736 | source2 &= operation_mask; | |
2737 | ||
2738 | /* Calculate the new breakpoint address. */ | |
2739 | inst_env->reg[REG_PC] &= pc_mask; | |
2740 | inst_env->reg[REG_PC] |= source1; | |
2741 | ||
2742 | } | |
2743 | ||
2744 | /* Extends the value from either byte or word size to a dword. If the mode | |
2745 | is zero extend then the value is extended with zero. If instead the mode | |
2746 | is signed extend the sign bit of the value is taken into consideration. */ | |
2747 | ||
a78f21af | 2748 | static unsigned long |
29134980 OF |
2749 | do_sign_or_zero_extend (unsigned long value, unsigned short *inst) |
2750 | { | |
2751 | /* The size can be either byte or word, check which one it is. | |
2752 | Don't check the highest bit, it's indicating if it's a zero | |
2753 | or sign extend. */ | |
2754 | if (cris_get_size (*inst) & INST_WORD_SIZE) | |
2755 | { | |
2756 | /* Word size. */ | |
2757 | value &= 0xFFFF; | |
2758 | ||
2759 | /* Check if the instruction is signed extend. If so, check if value has | |
2760 | the sign bit on. */ | |
2761 | if (cris_is_signed_extend_bit_on (*inst) && (value & SIGNED_WORD_MASK)) | |
2762 | { | |
2763 | value |= SIGNED_WORD_EXTEND_MASK; | |
2764 | } | |
2765 | } | |
2766 | else | |
2767 | { | |
2768 | /* Byte size. */ | |
2769 | value &= 0xFF; | |
2770 | ||
2771 | /* Check if the instruction is signed extend. If so, check if value has | |
2772 | the sign bit on. */ | |
2773 | if (cris_is_signed_extend_bit_on (*inst) && (value & SIGNED_BYTE_MASK)) | |
2774 | { | |
2775 | value |= SIGNED_BYTE_EXTEND_MASK; | |
2776 | } | |
2777 | } | |
2778 | /* The size should now be dword. */ | |
2779 | cris_set_size_to_dword (inst); | |
2780 | return value; | |
2781 | } | |
2782 | ||
2783 | /* Handles the register mode for the ADD, SUB, CMP, AND, OR and MOVE | |
2784 | instruction. The MOVE instruction is the move from source to register. */ | |
2785 | ||
a78f21af | 2786 | static void |
29134980 OF |
2787 | reg_mode_add_sub_cmp_and_or_move_op (unsigned short inst, |
2788 | inst_env_type *inst_env) | |
2789 | { | |
2790 | unsigned long operand1; | |
2791 | unsigned long operand2; | |
2792 | ||
2793 | /* It's invalid to have a prefix to the instruction. This is a register | |
2794 | mode instruction and can't have a prefix. */ | |
2795 | if (inst_env->prefix_found) | |
2796 | { | |
2797 | inst_env->invalid = 1; | |
2798 | return; | |
2799 | } | |
2800 | /* Check if the instruction has PC as its target. */ | |
2801 | if (cris_get_operand2 (inst) == REG_PC) | |
2802 | { | |
2803 | if (inst_env->slot_needed) | |
2804 | { | |
2805 | inst_env->invalid = 1; | |
2806 | return; | |
2807 | } | |
2808 | /* The instruction has the PC as its target register. */ | |
7ab98e9e | 2809 | operand1 = inst_env->reg[cris_get_operand1 (inst)]; |
29134980 OF |
2810 | operand2 = inst_env->reg[REG_PC]; |
2811 | ||
2812 | /* Check if it's a extend, signed or zero instruction. */ | |
2813 | if (cris_get_opcode (inst) < 4) | |
2814 | { | |
2815 | operand1 = do_sign_or_zero_extend (operand1, &inst); | |
2816 | } | |
2817 | /* Calculate the PC value after the instruction, i.e. where the | |
2818 | breakpoint should be. The order of the udw_operands is vital. */ | |
2819 | add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand1); | |
2820 | } | |
2821 | inst_env->slot_needed = 0; | |
2822 | inst_env->prefix_found = 0; | |
2823 | inst_env->xflag_found = 0; | |
2824 | inst_env->disable_interrupt = 0; | |
2825 | } | |
2826 | ||
2827 | /* Returns the data contained at address. The size of the data is derived from | |
2828 | the size of the operation. If the instruction is a zero or signed | |
2829 | extend instruction, the size field is changed in instruction. */ | |
2830 | ||
a78f21af | 2831 | static unsigned long |
29134980 OF |
2832 | get_data_from_address (unsigned short *inst, CORE_ADDR address) |
2833 | { | |
2834 | int size = cris_get_size (*inst); | |
2835 | unsigned long value; | |
2836 | ||
2837 | /* If it's an extend instruction we don't want the signed extend bit, | |
2838 | because it influences the size. */ | |
2839 | if (cris_get_opcode (*inst) < 4) | |
2840 | { | |
2841 | size &= ~SIGNED_EXTEND_BIT_MASK; | |
2842 | } | |
2843 | /* Is there a need for checking the size? Size should contain the number of | |
2844 | bytes to read. */ | |
2845 | size = 1 << size; | |
2846 | value = read_memory_unsigned_integer (address, size); | |
2847 | ||
2848 | /* Check if it's an extend, signed or zero instruction. */ | |
2849 | if (cris_get_opcode (*inst) < 4) | |
2850 | { | |
2851 | value = do_sign_or_zero_extend (value, inst); | |
2852 | } | |
2853 | return value; | |
2854 | } | |
2855 | ||
2856 | /* Handles the assign addresing mode for the ADD, SUB, CMP, AND, OR and MOVE | |
2857 | instructions. The MOVE instruction is the move from source to register. */ | |
2858 | ||
a78f21af | 2859 | static void |
29134980 OF |
2860 | handle_prefix_assign_mode_for_aritm_op (unsigned short inst, |
2861 | inst_env_type *inst_env) | |
2862 | { | |
2863 | unsigned long operand2; | |
2864 | unsigned long operand3; | |
2865 | ||
2866 | check_assign (inst, inst_env); | |
2867 | if (cris_get_operand2 (inst) == REG_PC) | |
2868 | { | |
2869 | operand2 = inst_env->reg[REG_PC]; | |
2870 | ||
2871 | /* Get the value of the third operand. */ | |
2872 | operand3 = get_data_from_address (&inst, inst_env->prefix_value); | |
2873 | ||
2874 | /* Calculate the PC value after the instruction, i.e. where the | |
2875 | breakpoint should be. The order of the udw_operands is vital. */ | |
2876 | add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand3); | |
2877 | } | |
2878 | inst_env->slot_needed = 0; | |
2879 | inst_env->prefix_found = 0; | |
2880 | inst_env->xflag_found = 0; | |
2881 | inst_env->disable_interrupt = 0; | |
2882 | } | |
2883 | ||
2884 | /* Handles the three-operand addressing mode for the ADD, SUB, CMP, AND and | |
2885 | OR instructions. Note that for this to work as expected, the calling | |
2886 | function must have made sure that there is a prefix to this instruction. */ | |
2887 | ||
a78f21af | 2888 | static void |
29134980 OF |
2889 | three_operand_add_sub_cmp_and_or_op (unsigned short inst, |
2890 | inst_env_type *inst_env) | |
2891 | { | |
2892 | unsigned long operand2; | |
2893 | unsigned long operand3; | |
2894 | ||
2895 | if (cris_get_operand1 (inst) == REG_PC) | |
2896 | { | |
2897 | /* The PC will be changed by the instruction. */ | |
2898 | operand2 = inst_env->reg[cris_get_operand2 (inst)]; | |
2899 | ||
2900 | /* Get the value of the third operand. */ | |
2901 | operand3 = get_data_from_address (&inst, inst_env->prefix_value); | |
2902 | ||
2903 | /* Calculate the PC value after the instruction, i.e. where the | |
2904 | breakpoint should be. */ | |
2905 | add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand3); | |
2906 | } | |
2907 | inst_env->slot_needed = 0; | |
2908 | inst_env->prefix_found = 0; | |
2909 | inst_env->xflag_found = 0; | |
2910 | inst_env->disable_interrupt = 0; | |
2911 | } | |
2912 | ||
2913 | /* Handles the index addresing mode for the ADD, SUB, CMP, AND, OR and MOVE | |
2914 | instructions. The MOVE instruction is the move from source to register. */ | |
2915 | ||
a78f21af | 2916 | static void |
29134980 OF |
2917 | handle_prefix_index_mode_for_aritm_op (unsigned short inst, |
2918 | inst_env_type *inst_env) | |
2919 | { | |
2920 | if (cris_get_operand1 (inst) != cris_get_operand2 (inst)) | |
2921 | { | |
2922 | /* If the instruction is MOVE it's invalid. If the instruction is ADD, | |
2923 | SUB, AND or OR something weird is going on (if everything works these | |
2924 | instructions should end up in the three operand version). */ | |
2925 | inst_env->invalid = 1; | |
2926 | return; | |
2927 | } | |
2928 | else | |
2929 | { | |
2930 | /* three_operand_add_sub_cmp_and_or does the same as we should do here | |
2931 | so use it. */ | |
2932 | three_operand_add_sub_cmp_and_or_op (inst, inst_env); | |
2933 | } | |
2934 | inst_env->slot_needed = 0; | |
2935 | inst_env->prefix_found = 0; | |
2936 | inst_env->xflag_found = 0; | |
2937 | inst_env->disable_interrupt = 0; | |
2938 | } | |
2939 | ||
2940 | /* Handles the autoincrement and indirect addresing mode for the ADD, SUB, | |
2941 | CMP, AND OR and MOVE instruction. The MOVE instruction is the move from | |
2942 | source to register. */ | |
2943 | ||
a78f21af | 2944 | static void |
29134980 OF |
2945 | handle_inc_and_index_mode_for_aritm_op (unsigned short inst, |
2946 | inst_env_type *inst_env) | |
2947 | { | |
2948 | unsigned long operand1; | |
2949 | unsigned long operand2; | |
2950 | unsigned long operand3; | |
2951 | int size; | |
2952 | ||
2953 | /* The instruction is either an indirect or autoincrement addressing mode. | |
2954 | Check if the destination register is the PC. */ | |
2955 | if (cris_get_operand2 (inst) == REG_PC) | |
2956 | { | |
2957 | /* Must be done here, get_data_from_address may change the size | |
2958 | field. */ | |
2959 | size = cris_get_size (inst); | |
2960 | operand2 = inst_env->reg[REG_PC]; | |
2961 | ||
2962 | /* Get the value of the third operand, i.e. the indirect operand. */ | |
2963 | operand1 = inst_env->reg[cris_get_operand1 (inst)]; | |
2964 | operand3 = get_data_from_address (&inst, operand1); | |
2965 | ||
2966 | /* Calculate the PC value after the instruction, i.e. where the | |
2967 | breakpoint should be. The order of the udw_operands is vital. */ | |
2968 | add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand3); | |
2969 | } | |
2970 | /* If this is an autoincrement addressing mode, check if the increment | |
2971 | changes the PC. */ | |
2972 | if ((cris_get_operand1 (inst) == REG_PC) && (cris_get_mode (inst) == AUTOINC_MODE)) | |
2973 | { | |
2974 | /* Get the size field. */ | |
2975 | size = cris_get_size (inst); | |
2976 | ||
2977 | /* If it's an extend instruction we don't want the signed extend bit, | |
2978 | because it influences the size. */ | |
2979 | if (cris_get_opcode (inst) < 4) | |
2980 | { | |
2981 | size &= ~SIGNED_EXTEND_BIT_MASK; | |
2982 | } | |
2983 | process_autoincrement (size, inst, inst_env); | |
2984 | } | |
2985 | inst_env->slot_needed = 0; | |
2986 | inst_env->prefix_found = 0; | |
2987 | inst_env->xflag_found = 0; | |
2988 | inst_env->disable_interrupt = 0; | |
2989 | } | |
2990 | ||
2991 | /* Handles the two-operand addressing mode, all modes except register, for | |
2992 | the ADD, SUB CMP, AND and OR instruction. */ | |
2993 | ||
a78f21af | 2994 | static void |
29134980 OF |
2995 | none_reg_mode_add_sub_cmp_and_or_move_op (unsigned short inst, |
2996 | inst_env_type *inst_env) | |
2997 | { | |
2998 | if (inst_env->prefix_found) | |
2999 | { | |
3000 | if (cris_get_mode (inst) == PREFIX_INDEX_MODE) | |
3001 | { | |
3002 | handle_prefix_index_mode_for_aritm_op (inst, inst_env); | |
3003 | } | |
3004 | else if (cris_get_mode (inst) == PREFIX_ASSIGN_MODE) | |
3005 | { | |
3006 | handle_prefix_assign_mode_for_aritm_op (inst, inst_env); | |
3007 | } | |
3008 | else | |
3009 | { | |
3010 | /* The mode is invalid for a prefixed base instruction. */ | |
3011 | inst_env->invalid = 1; | |
3012 | return; | |
3013 | } | |
3014 | } | |
3015 | else | |
3016 | { | |
3017 | handle_inc_and_index_mode_for_aritm_op (inst, inst_env); | |
3018 | } | |
3019 | } | |
3020 | ||
3021 | /* Handles the quick addressing mode for the ADD and SUB instruction. */ | |
3022 | ||
a78f21af | 3023 | static void |
29134980 OF |
3024 | quick_mode_add_sub_op (unsigned short inst, inst_env_type *inst_env) |
3025 | { | |
3026 | unsigned long operand1; | |
3027 | unsigned long operand2; | |
3028 | ||
3029 | /* It's a bad idea to be in a prefix instruction now. This is a quick mode | |
3030 | instruction and can't have a prefix. */ | |
3031 | if (inst_env->prefix_found) | |
3032 | { | |
3033 | inst_env->invalid = 1; | |
3034 | return; | |
3035 | } | |
3036 | ||
3037 | /* Check if the instruction has PC as its target. */ | |
3038 | if (cris_get_operand2 (inst) == REG_PC) | |
3039 | { | |
3040 | if (inst_env->slot_needed) | |
3041 | { | |
3042 | inst_env->invalid = 1; | |
3043 | return; | |
3044 | } | |
3045 | operand1 = cris_get_quick_value (inst); | |
3046 | operand2 = inst_env->reg[REG_PC]; | |
3047 | ||
3048 | /* The size should now be dword. */ | |
3049 | cris_set_size_to_dword (&inst); | |
3050 | ||
3051 | /* Calculate the PC value after the instruction, i.e. where the | |
3052 | breakpoint should be. */ | |
3053 | add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand1); | |
3054 | } | |
3055 | inst_env->slot_needed = 0; | |
3056 | inst_env->prefix_found = 0; | |
3057 | inst_env->xflag_found = 0; | |
3058 | inst_env->disable_interrupt = 0; | |
3059 | } | |
3060 | ||
3061 | /* Handles the quick addressing mode for the CMP, AND and OR instruction. */ | |
3062 | ||
a78f21af | 3063 | static void |
29134980 OF |
3064 | quick_mode_and_cmp_move_or_op (unsigned short inst, inst_env_type *inst_env) |
3065 | { | |
3066 | unsigned long operand1; | |
3067 | unsigned long operand2; | |
3068 | ||
3069 | /* It's a bad idea to be in a prefix instruction now. This is a quick mode | |
3070 | instruction and can't have a prefix. */ | |
3071 | if (inst_env->prefix_found) | |
3072 | { | |
3073 | inst_env->invalid = 1; | |
3074 | return; | |
3075 | } | |
3076 | /* Check if the instruction has PC as its target. */ | |
3077 | if (cris_get_operand2 (inst) == REG_PC) | |
3078 | { | |
3079 | if (inst_env->slot_needed) | |
3080 | { | |
3081 | inst_env->invalid = 1; | |
3082 | return; | |
3083 | } | |
3084 | /* The instruction has the PC as its target register. */ | |
3085 | operand1 = cris_get_quick_value (inst); | |
3086 | operand2 = inst_env->reg[REG_PC]; | |
3087 | ||
3088 | /* The quick value is signed, so check if we must do a signed extend. */ | |
3089 | if (operand1 & SIGNED_QUICK_VALUE_MASK) | |
3090 | { | |
3091 | /* sign extend */ | |
3092 | operand1 |= SIGNED_QUICK_VALUE_EXTEND_MASK; | |
3093 | } | |
3094 | /* The size should now be dword. */ | |
3095 | cris_set_size_to_dword (&inst); | |
3096 | ||
3097 | /* Calculate the PC value after the instruction, i.e. where the | |
3098 | breakpoint should be. */ | |
3099 | add_sub_cmp_and_or_move_action (inst, inst_env, operand2, operand1); | |
3100 | } | |
3101 | inst_env->slot_needed = 0; | |
3102 | inst_env->prefix_found = 0; | |
3103 | inst_env->xflag_found = 0; | |
3104 | inst_env->disable_interrupt = 0; | |
3105 | } | |
3106 | ||
3107 | /* Translate op_type to a function and call it. */ | |
3108 | ||
a78f21af AC |
3109 | static void |
3110 | cris_gdb_func (enum cris_op_type op_type, unsigned short inst, | |
3111 | inst_env_type *inst_env) | |
29134980 OF |
3112 | { |
3113 | switch (op_type) | |
3114 | { | |
3115 | case cris_not_implemented_op: | |
3116 | not_implemented_op (inst, inst_env); | |
3117 | break; | |
3118 | ||
3119 | case cris_abs_op: | |
3120 | abs_op (inst, inst_env); | |
3121 | break; | |
3122 | ||
3123 | case cris_addi_op: | |
3124 | addi_op (inst, inst_env); | |
3125 | break; | |
3126 | ||
3127 | case cris_asr_op: | |
3128 | asr_op (inst, inst_env); | |
3129 | break; | |
3130 | ||
3131 | case cris_asrq_op: | |
3132 | asrq_op (inst, inst_env); | |
3133 | break; | |
3134 | ||
3135 | case cris_ax_ei_setf_op: | |
3136 | ax_ei_setf_op (inst, inst_env); | |
3137 | break; | |
3138 | ||
3139 | case cris_bdap_prefix: | |
3140 | bdap_prefix (inst, inst_env); | |
3141 | break; | |
3142 | ||
3143 | case cris_biap_prefix: | |
3144 | biap_prefix (inst, inst_env); | |
3145 | break; | |
3146 | ||
3147 | case cris_break_op: | |
3148 | break_op (inst, inst_env); | |
3149 | break; | |
3150 | ||
3151 | case cris_btst_nop_op: | |
3152 | btst_nop_op (inst, inst_env); | |
3153 | break; | |
3154 | ||
3155 | case cris_clearf_di_op: | |
3156 | clearf_di_op (inst, inst_env); | |
3157 | break; | |
3158 | ||
3159 | case cris_dip_prefix: | |
3160 | dip_prefix (inst, inst_env); | |
3161 | break; | |
3162 | ||
3163 | case cris_dstep_logshift_mstep_neg_not_op: | |
3164 | dstep_logshift_mstep_neg_not_op (inst, inst_env); | |
3165 | break; | |
3166 | ||
3167 | case cris_eight_bit_offset_branch_op: | |
3168 | eight_bit_offset_branch_op (inst, inst_env); | |
3169 | break; | |
3170 | ||
3171 | case cris_move_mem_to_reg_movem_op: | |
3172 | move_mem_to_reg_movem_op (inst, inst_env); | |
3173 | break; | |
3174 | ||
3175 | case cris_move_reg_to_mem_movem_op: | |
3176 | move_reg_to_mem_movem_op (inst, inst_env); | |
3177 | break; | |
3178 | ||
3179 | case cris_move_to_preg_op: | |
3180 | move_to_preg_op (inst, inst_env); | |
3181 | break; | |
3182 | ||
3183 | case cris_muls_op: | |
3184 | muls_op (inst, inst_env); | |
3185 | break; | |
3186 | ||
3187 | case cris_mulu_op: | |
3188 | mulu_op (inst, inst_env); | |
3189 | break; | |
3190 | ||
3191 | case cris_none_reg_mode_add_sub_cmp_and_or_move_op: | |
3192 | none_reg_mode_add_sub_cmp_and_or_move_op (inst, inst_env); | |
3193 | break; | |
3194 | ||
3195 | case cris_none_reg_mode_clear_test_op: | |
3196 | none_reg_mode_clear_test_op (inst, inst_env); | |
3197 | break; | |
3198 | ||
3199 | case cris_none_reg_mode_jump_op: | |
3200 | none_reg_mode_jump_op (inst, inst_env); | |
3201 | break; | |
3202 | ||
3203 | case cris_none_reg_mode_move_from_preg_op: | |
3204 | none_reg_mode_move_from_preg_op (inst, inst_env); | |
3205 | break; | |
3206 | ||
3207 | case cris_quick_mode_add_sub_op: | |
3208 | quick_mode_add_sub_op (inst, inst_env); | |
3209 | break; | |
3210 | ||
3211 | case cris_quick_mode_and_cmp_move_or_op: | |
3212 | quick_mode_and_cmp_move_or_op (inst, inst_env); | |
3213 | break; | |
3214 | ||
3215 | case cris_quick_mode_bdap_prefix: | |
3216 | quick_mode_bdap_prefix (inst, inst_env); | |
3217 | break; | |
3218 | ||
3219 | case cris_reg_mode_add_sub_cmp_and_or_move_op: | |
3220 | reg_mode_add_sub_cmp_and_or_move_op (inst, inst_env); | |
3221 | break; | |
3222 | ||
3223 | case cris_reg_mode_clear_op: | |
3224 | reg_mode_clear_op (inst, inst_env); | |
3225 | break; | |
3226 | ||
3227 | case cris_reg_mode_jump_op: | |
3228 | reg_mode_jump_op (inst, inst_env); | |
3229 | break; | |
3230 | ||
3231 | case cris_reg_mode_move_from_preg_op: | |
3232 | reg_mode_move_from_preg_op (inst, inst_env); | |
3233 | break; | |
3234 | ||
3235 | case cris_reg_mode_test_op: | |
3236 | reg_mode_test_op (inst, inst_env); | |
3237 | break; | |
3238 | ||
3239 | case cris_scc_op: | |
3240 | scc_op (inst, inst_env); | |
3241 | break; | |
3242 | ||
3243 | case cris_sixteen_bit_offset_branch_op: | |
3244 | sixteen_bit_offset_branch_op (inst, inst_env); | |
3245 | break; | |
3246 | ||
3247 | case cris_three_operand_add_sub_cmp_and_or_op: | |
3248 | three_operand_add_sub_cmp_and_or_op (inst, inst_env); | |
3249 | break; | |
3250 | ||
3251 | case cris_three_operand_bound_op: | |
3252 | three_operand_bound_op (inst, inst_env); | |
3253 | break; | |
3254 | ||
3255 | case cris_two_operand_bound_op: | |
3256 | two_operand_bound_op (inst, inst_env); | |
3257 | break; | |
3258 | ||
3259 | case cris_xor_op: | |
3260 | xor_op (inst, inst_env); | |
3261 | break; | |
3262 | } | |
3263 | } | |
3264 | ||
3265 | /* This wrapper is to avoid cris_get_assembler being called before | |
3266 | exec_bfd has been set. */ | |
3267 | ||
3268 | static int | |
a89aa300 | 3269 | cris_delayed_get_disassembler (bfd_vma addr, struct disassemble_info *info) |
29134980 | 3270 | { |
a89aa300 | 3271 | int (*print_insn) (bfd_vma addr, struct disassemble_info *info); |
36482093 AC |
3272 | /* FIXME: cagney/2003-08-27: It should be possible to select a CRIS |
3273 | disassembler, even when there is no BFD. Does something like | |
3274 | "gdb; target remote; disassmeble *0x123" work? */ | |
3275 | gdb_assert (exec_bfd != NULL); | |
3276 | print_insn = cris_get_disassembler (exec_bfd); | |
3277 | gdb_assert (print_insn != NULL); | |
3278 | return print_insn (addr, info); | |
29134980 OF |
3279 | } |
3280 | ||
dbbff683 OF |
3281 | /* Copied from <asm/elf.h>. */ |
3282 | typedef unsigned long elf_greg_t; | |
3283 | ||
3284 | /* Same as user_regs_struct struct in <asm/user.h>. */ | |
3285 | typedef elf_greg_t elf_gregset_t[35]; | |
3286 | ||
3287 | /* Unpack an elf_gregset_t into GDB's register cache. */ | |
3288 | ||
a78f21af | 3289 | static void |
dbbff683 OF |
3290 | supply_gregset (elf_gregset_t *gregsetp) |
3291 | { | |
3292 | int i; | |
3293 | elf_greg_t *regp = *gregsetp; | |
3294 | static char zerobuf[4] = {0}; | |
3295 | ||
3296 | /* The kernel dumps all 32 registers as unsigned longs, but supply_register | |
3297 | knows about the actual size of each register so that's no problem. */ | |
3298 | for (i = 0; i < NUM_GENREGS + NUM_SPECREGS; i++) | |
3299 | { | |
23a6d369 | 3300 | regcache_raw_supply (current_regcache, i, (char *)®p[i]); |
dbbff683 OF |
3301 | } |
3302 | } | |
3303 | ||
3304 | /* Use a local version of this function to get the correct types for | |
3305 | regsets, until multi-arch core support is ready. */ | |
3306 | ||
3307 | static void | |
3308 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, | |
3309 | int which, CORE_ADDR reg_addr) | |
3310 | { | |
3311 | elf_gregset_t gregset; | |
3312 | ||
3313 | switch (which) | |
3314 | { | |
3315 | case 0: | |
3316 | if (core_reg_size != sizeof (gregset)) | |
3317 | { | |
3318 | warning ("wrong size gregset struct in core file"); | |
3319 | } | |
3320 | else | |
3321 | { | |
3322 | memcpy (&gregset, core_reg_sect, sizeof (gregset)); | |
3323 | supply_gregset (&gregset); | |
3324 | } | |
3325 | ||
3326 | default: | |
3327 | /* We've covered all the kinds of registers we know about here, | |
3328 | so this must be something we wouldn't know what to do with | |
3329 | anyway. Just ignore it. */ | |
3330 | break; | |
3331 | } | |
3332 | } | |
3333 | ||
3334 | static struct core_fns cris_elf_core_fns = | |
3335 | { | |
3336 | bfd_target_elf_flavour, /* core_flavour */ | |
3337 | default_check_format, /* check_format */ | |
3338 | default_core_sniffer, /* core_sniffer */ | |
3339 | fetch_core_registers, /* core_read_registers */ | |
3340 | NULL /* next */ | |
3341 | }; | |
3342 | ||
3343 | /* Fetch (and possibly build) an appropriate link_map_offsets | |
8605d56e AC |
3344 | structure for native GNU/Linux CRIS targets using the struct |
3345 | offsets defined in link.h (but without actual reference to that | |
3346 | file). | |
dbbff683 | 3347 | |
8605d56e AC |
3348 | This makes it possible to access GNU/Linux CRIS shared libraries |
3349 | from a GDB that was not built on an GNU/Linux CRIS host (for cross | |
3350 | debugging). | |
dbbff683 OF |
3351 | |
3352 | See gdb/solib-svr4.h for an explanation of these fields. */ | |
3353 | ||
a78f21af | 3354 | static struct link_map_offsets * |
dbbff683 OF |
3355 | cris_linux_svr4_fetch_link_map_offsets (void) |
3356 | { | |
3357 | static struct link_map_offsets lmo; | |
3358 | static struct link_map_offsets *lmp = NULL; | |
3359 | ||
3360 | if (lmp == NULL) | |
3361 | { | |
3362 | lmp = &lmo; | |
3363 | ||
3364 | lmo.r_debug_size = 8; /* The actual size is 20 bytes, but | |
3365 | this is all we need. */ | |
3366 | lmo.r_map_offset = 4; | |
3367 | lmo.r_map_size = 4; | |
3368 | ||
3369 | lmo.link_map_size = 20; | |
3370 | ||
3371 | lmo.l_addr_offset = 0; | |
3372 | lmo.l_addr_size = 4; | |
3373 | ||
3374 | lmo.l_name_offset = 4; | |
3375 | lmo.l_name_size = 4; | |
3376 | ||
3377 | lmo.l_next_offset = 12; | |
3378 | lmo.l_next_size = 4; | |
3379 | ||
3380 | lmo.l_prev_offset = 16; | |
3381 | lmo.l_prev_size = 4; | |
3382 | } | |
3383 | ||
3384 | return lmp; | |
3385 | } | |
3386 | ||
3387 | static void | |
3388 | cris_fpless_backtrace (char *noargs, int from_tty) | |
3389 | { | |
3390 | /* Points at the instruction after the jsr (except when in innermost frame | |
3391 | where it points at the original pc). */ | |
3392 | CORE_ADDR pc = 0; | |
3393 | ||
3394 | /* Temporary variable, used for parsing from the start of the function that | |
3395 | the pc is in, up to the pc. */ | |
3396 | CORE_ADDR tmp_pc = 0; | |
3397 | CORE_ADDR sp = 0; | |
3398 | ||
3399 | /* Information about current frame. */ | |
3400 | struct symtab_and_line sal; | |
3401 | char* func_name; | |
3402 | ||
3403 | /* Present instruction. */ | |
3404 | unsigned short insn; | |
3405 | ||
3406 | /* Next instruction, lookahead. */ | |
3407 | unsigned short insn_next; | |
3408 | ||
3409 | /* This is to store the offset between sp at start of function and until we | |
3410 | reach push srp (if any). */ | |
3411 | int sp_add_later = 0; | |
3412 | int push_srp_found = 0; | |
3413 | ||
3414 | int val = 0; | |
3415 | ||
3416 | /* Frame counter. */ | |
3417 | int frame = 0; | |
3418 | ||
3419 | /* For the innermost frame, we want to look at srp in case it's a leaf | |
3420 | function (since there's no push srp in that case). */ | |
3421 | int innermost_frame = 1; | |
3422 | ||
4caf0990 AC |
3423 | deprecated_read_register_gen (PC_REGNUM, (char *) &pc); |
3424 | deprecated_read_register_gen (SP_REGNUM, (char *) &sp); | |
dbbff683 OF |
3425 | |
3426 | /* We make an explicit return when we can't find an outer frame. */ | |
3427 | while (1) | |
3428 | { | |
3429 | /* Get file name and line number. */ | |
3430 | sal = find_pc_line (pc, 0); | |
3431 | ||
3432 | /* Get function name. */ | |
3433 | find_pc_partial_function (pc, &func_name, (CORE_ADDR *) NULL, | |
3434 | (CORE_ADDR *) NULL); | |
3435 | ||
3436 | /* Print information about current frame. */ | |
3437 | printf_unfiltered ("#%i 0x%08lx in %s", frame++, pc, func_name); | |
3438 | if (sal.symtab) | |
3439 | { | |
3440 | printf_unfiltered (" at %s:%i", sal.symtab->filename, sal.line); | |
3441 | } | |
3442 | printf_unfiltered ("\n"); | |
3443 | ||
3444 | /* Get the start address of this function. */ | |
3445 | tmp_pc = get_pc_function_start (pc); | |
3446 | ||
3447 | /* Mini parser, only meant to find push sp and sub ...,sp from the start | |
3448 | of the function, up to the pc. */ | |
3449 | while (tmp_pc < pc) | |
3450 | { | |
3451 | insn = read_memory_unsigned_integer (tmp_pc, sizeof (short)); | |
3452 | tmp_pc += sizeof (short); | |
3453 | if (insn == 0xE1FC) | |
3454 | { | |
3455 | /* push <reg> 32 bit instruction */ | |
3456 | insn_next = read_memory_unsigned_integer (tmp_pc, | |
3457 | sizeof (short)); | |
3458 | tmp_pc += sizeof (short); | |
3459 | ||
3460 | /* Recognize srp. */ | |
3461 | if (insn_next == 0xBE7E) | |
3462 | { | |
3463 | /* For subsequent (not this one though) push or sub which | |
3464 | affects sp, adjust sp immediately. */ | |
3465 | push_srp_found = 1; | |
3466 | ||
3467 | /* Note: this will break if we ever encounter a | |
3468 | push vr (1 byte) or push ccr (2 bytes). */ | |
3469 | sp_add_later += 4; | |
3470 | } | |
3471 | else | |
3472 | { | |
3473 | /* Some other register was pushed. */ | |
3474 | if (push_srp_found) | |
3475 | { | |
3476 | sp += 4; | |
3477 | } | |
3478 | else | |
3479 | { | |
3480 | sp_add_later += 4; | |
3481 | } | |
3482 | } | |
3483 | } | |
3484 | else if (cris_get_operand2 (insn) == SP_REGNUM | |
3485 | && cris_get_mode (insn) == 0x0000 | |
3486 | && cris_get_opcode (insn) == 0x000A) | |
3487 | { | |
3488 | /* subq <val>,sp */ | |
3489 | val = cris_get_quick_value (insn); | |
3490 | ||
3491 | if (push_srp_found) | |
3492 | { | |
3493 | sp += val; | |
3494 | } | |
3495 | else | |
3496 | { | |
3497 | sp_add_later += val; | |
3498 | } | |
3499 | ||
3500 | } | |
3501 | else if (cris_get_operand2 (insn) == SP_REGNUM | |
3502 | /* Autoincrement addressing mode. */ | |
3503 | && cris_get_mode (insn) == 0x0003 | |
3504 | /* Opcode. */ | |
3505 | && ((insn) & 0x03E0) >> 5 == 0x0004) | |
3506 | { | |
3507 | /* subu <val>,sp */ | |
3508 | val = get_data_from_address (&insn, tmp_pc); | |
3509 | ||
3510 | if (push_srp_found) | |
3511 | { | |
3512 | sp += val; | |
3513 | } | |
3514 | else | |
3515 | { | |
3516 | sp_add_later += val; | |
3517 | } | |
3518 | } | |
3519 | else if (cris_get_operand2 (insn) == SP_REGNUM | |
3520 | && ((insn & 0x0F00) >> 8) == 0x0001 | |
3521 | && (cris_get_signed_offset (insn) < 0)) | |
3522 | { | |
3523 | /* Immediate byte offset addressing prefix word with sp as base | |
3524 | register. Used for CRIS v8 i.e. ETRAX 100 and newer if <val> | |
3525 | is between 64 and 128. | |
3526 | movem r<regsave>,[sp=sp-<val>] */ | |
3527 | val = -cris_get_signed_offset (insn); | |
3528 | insn_next = read_memory_unsigned_integer (tmp_pc, | |
3529 | sizeof (short)); | |
3530 | tmp_pc += sizeof (short); | |
3531 | ||
3532 | if (cris_get_mode (insn_next) == PREFIX_ASSIGN_MODE | |
3533 | && cris_get_opcode (insn_next) == 0x000F | |
3534 | && cris_get_size (insn_next) == 0x0003 | |
3535 | && cris_get_operand1 (insn_next) == SP_REGNUM) | |
3536 | { | |
3537 | if (push_srp_found) | |
3538 | { | |
3539 | sp += val; | |
3540 | } | |
3541 | else | |
3542 | { | |
3543 | sp_add_later += val; | |
3544 | } | |
3545 | } | |
3546 | } | |
3547 | } | |
3548 | ||
3549 | if (push_srp_found) | |
3550 | { | |
3551 | /* Reset flag. */ | |
3552 | push_srp_found = 0; | |
3553 | ||
3554 | /* sp should now point at where srp is stored on the stack. Update | |
3555 | the pc to the srp. */ | |
3556 | pc = read_memory_unsigned_integer (sp, 4); | |
3557 | } | |
3558 | else if (innermost_frame) | |
3559 | { | |
3560 | /* We couldn't find a push srp in the prologue, so this must be | |
3561 | a leaf function, and thus we use the srp register directly. | |
3562 | This should happen at most once, for the innermost function. */ | |
4caf0990 | 3563 | deprecated_read_register_gen (SRP_REGNUM, (char *) &pc); |
dbbff683 OF |
3564 | } |
3565 | else | |
3566 | { | |
3567 | /* Couldn't find an outer frame. */ | |
3568 | return; | |
3569 | } | |
3570 | ||
3571 | /* Reset flag. (In case the innermost frame wasn't a leaf, we don't | |
3572 | want to look at the srp register later either). */ | |
3573 | innermost_frame = 0; | |
3574 | ||
3575 | /* Now, add the offset for everything up to, and including push srp, | |
3576 | that was held back during the prologue parsing. */ | |
3577 | sp += sp_add_later; | |
3578 | sp_add_later = 0; | |
3579 | } | |
3580 | } | |
3581 | ||
a78f21af AC |
3582 | extern initialize_file_ftype _initialize_cris_tdep; /* -Wmissing-prototypes */ |
3583 | ||
29134980 OF |
3584 | void |
3585 | _initialize_cris_tdep (void) | |
3586 | { | |
3587 | struct cmd_list_element *c; | |
3588 | ||
3589 | gdbarch_register (bfd_arch_cris, cris_gdbarch_init, cris_dump_tdep); | |
3590 | ||
29134980 OF |
3591 | /* CRIS-specific user-commands. */ |
3592 | c = add_set_cmd ("cris-version", class_support, var_integer, | |
3593 | (char *) &usr_cmd_cris_version, | |
3594 | "Set the current CRIS version.", &setlist); | |
9f60d481 | 3595 | set_cmd_sfunc (c, cris_version_update); |
cb1a6d5f | 3596 | deprecated_add_show_from_set (c, &showlist); |
29134980 OF |
3597 | |
3598 | c = add_set_enum_cmd ("cris-mode", class_support, cris_mode_enums, | |
3599 | &usr_cmd_cris_mode, | |
3600 | "Set the current CRIS mode.", &setlist); | |
9f60d481 | 3601 | set_cmd_sfunc (c, cris_mode_update); |
cb1a6d5f | 3602 | deprecated_add_show_from_set (c, &showlist); |
29134980 | 3603 | |
dbbff683 OF |
3604 | c = add_cmd ("cris-fpless-backtrace", class_support, cris_fpless_backtrace, |
3605 | "Display call chain using the subroutine return pointer.\n" | |
3606 | "Note that this displays the address after the jump to the " | |
3607 | "subroutine.", &cmdlist); | |
3608 | ||
00e32a35 | 3609 | deprecated_add_core_fns (&cris_elf_core_fns); |
dbbff683 | 3610 | |
29134980 OF |
3611 | } |
3612 | ||
3613 | /* Prints out all target specific values. */ | |
3614 | ||
3615 | static void | |
3616 | cris_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) | |
3617 | { | |
3618 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
3619 | if (tdep != NULL) | |
3620 | { | |
3621 | fprintf_unfiltered (file, "cris_dump_tdep: tdep->cris_version = %i\n", | |
3622 | tdep->cris_version); | |
3623 | fprintf_unfiltered (file, "cris_dump_tdep: tdep->cris_mode = %s\n", | |
3624 | tdep->cris_mode); | |
29134980 OF |
3625 | } |
3626 | } | |
3627 | ||
3628 | static void | |
3629 | cris_version_update (char *ignore_args, int from_tty, | |
3630 | struct cmd_list_element *c) | |
3631 | { | |
3632 | struct gdbarch_info info; | |
3633 | ||
cb1a6d5f AC |
3634 | /* NOTE: cagney/2002-03-17: The deprecated_add_show_from_set() |
3635 | function clones the set command passed as a parameter. The clone | |
3636 | operation will include (BUG?) any ``set'' command callback, if | |
3637 | present. Commands like ``info set'' call all the ``show'' | |
3638 | command callbacks. Unfortunately, for ``show'' commands cloned | |
3639 | from ``set'', this includes callbacks belonging to ``set'' | |
3640 | commands. Making this worse, this only occures if | |
3641 | deprecated_add_show_from_set() is called after add_cmd_sfunc() | |
3642 | (BUG?). */ | |
1868c04e | 3643 | |
29134980 | 3644 | /* From here on, trust the user's CRIS version setting. */ |
1868c04e | 3645 | if (cmd_type (c) == set_cmd) |
29134980 OF |
3646 | { |
3647 | usr_cmd_cris_version_valid = 1; | |
3648 | ||
3649 | /* Update the current architecture, if needed. */ | |
fb6ecb0f | 3650 | gdbarch_info_init (&info); |
29134980 OF |
3651 | if (!gdbarch_update_p (info)) |
3652 | internal_error (__FILE__, __LINE__, "cris_gdbarch_update: failed to update architecture."); | |
3653 | } | |
3654 | } | |
3655 | ||
3656 | static void | |
3657 | cris_mode_update (char *ignore_args, int from_tty, | |
3658 | struct cmd_list_element *c) | |
3659 | { | |
3660 | struct gdbarch_info info; | |
3661 | ||
cb1a6d5f AC |
3662 | /* NOTE: cagney/2002-03-17: The deprecated_add_show_from_set() |
3663 | function clones the set command passed as a parameter. The clone | |
3664 | operation will include (BUG?) any ``set'' command callback, if | |
3665 | present. Commands like ``info set'' call all the ``show'' | |
3666 | command callbacks. Unfortunately, for ``show'' commands cloned | |
3667 | from ``set'', this includes callbacks belonging to ``set'' | |
3668 | commands. Making this worse, this only occures if | |
3669 | deprecated_add_show_from_set() is called after add_cmd_sfunc() | |
3670 | (BUG?). */ | |
1868c04e | 3671 | |
29134980 | 3672 | /* From here on, trust the user's CRIS mode setting. */ |
1868c04e | 3673 | if (cmd_type (c) == set_cmd) |
29134980 OF |
3674 | { |
3675 | usr_cmd_cris_mode_valid = 1; | |
3676 | ||
3677 | /* Update the current architecture, if needed. */ | |
fb6ecb0f | 3678 | gdbarch_info_init (&info); |
29134980 OF |
3679 | if (!gdbarch_update_p (info)) |
3680 | internal_error (__FILE__, __LINE__, "cris_gdbarch_update: failed to update architecture."); | |
3681 | } | |
3682 | } | |
3683 | ||
29134980 OF |
3684 | static struct gdbarch * |
3685 | cris_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
3686 | { | |
3687 | struct gdbarch *gdbarch; | |
3688 | struct gdbarch_tdep *tdep; | |
3689 | int cris_version; | |
3690 | const char *cris_mode; | |
29134980 OF |
3691 | int register_bytes; |
3692 | ||
3693 | if (usr_cmd_cris_version_valid) | |
3694 | { | |
3695 | /* Trust the user's CRIS version setting. */ | |
3696 | cris_version = usr_cmd_cris_version; | |
3697 | } | |
3698 | else | |
3699 | { | |
3700 | /* Assume it's CRIS version 10. */ | |
3701 | cris_version = 10; | |
3702 | } | |
3703 | ||
3704 | if (usr_cmd_cris_mode_valid) | |
3705 | { | |
3706 | /* Trust the user's CRIS mode setting. */ | |
3707 | cris_mode = usr_cmd_cris_mode; | |
3708 | } | |
3709 | else if (cris_version == 10) | |
3710 | { | |
3711 | /* Assume CRIS version 10 is in user mode. */ | |
3712 | cris_mode = CRIS_MODE_USER; | |
3713 | } | |
3714 | else | |
3715 | { | |
3716 | /* Strictly speaking, older CRIS version don't have a supervisor mode, | |
3717 | but we regard its only mode as supervisor mode. */ | |
3718 | cris_mode = CRIS_MODE_SUPERVISOR; | |
3719 | } | |
3720 | ||
29134980 OF |
3721 | /* Make the current settings visible to the user. */ |
3722 | usr_cmd_cris_version = cris_version; | |
3723 | usr_cmd_cris_mode = cris_mode; | |
29134980 OF |
3724 | |
3725 | /* Find a candidate among the list of pre-declared architectures. Both | |
3726 | CRIS version and ABI must match. */ | |
3727 | for (arches = gdbarch_list_lookup_by_info (arches, &info); | |
3728 | arches != NULL; | |
3729 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) | |
3730 | { | |
3731 | if ((gdbarch_tdep (arches->gdbarch)->cris_version == cris_version) | |
2e4b5889 | 3732 | && (gdbarch_tdep (arches->gdbarch)->cris_mode == cris_mode)) |
29134980 OF |
3733 | return arches->gdbarch; |
3734 | } | |
3735 | ||
3736 | /* No matching architecture was found. Create a new one. */ | |
3737 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); | |
3738 | gdbarch = gdbarch_alloc (&info, tdep); | |
3739 | ||
3740 | tdep->cris_version = cris_version; | |
3741 | tdep->cris_mode = cris_mode; | |
29134980 OF |
3742 | |
3743 | /* INIT shall ensure that the INFO.BYTE_ORDER is non-zero. */ | |
3744 | switch (info.byte_order) | |
3745 | { | |
778eb05e | 3746 | case BFD_ENDIAN_LITTLE: |
29134980 OF |
3747 | /* Ok. */ |
3748 | break; | |
3749 | ||
d7449b42 | 3750 | case BFD_ENDIAN_BIG: |
29134980 OF |
3751 | internal_error (__FILE__, __LINE__, "cris_gdbarch_init: big endian byte order in info"); |
3752 | break; | |
3753 | ||
3754 | default: | |
3755 | internal_error (__FILE__, __LINE__, "cris_gdbarch_init: unknown byte order in info"); | |
3756 | } | |
3757 | ||
b4206d25 | 3758 | set_gdbarch_return_value (gdbarch, cris_return_value); |
2e4b5889 OF |
3759 | set_gdbarch_deprecated_reg_struct_has_addr (gdbarch, |
3760 | cris_reg_struct_has_addr); | |
b5622e8d | 3761 | set_gdbarch_deprecated_use_struct_convention (gdbarch, always_use_struct_convention); |
29134980 | 3762 | |
29134980 OF |
3763 | /* There are 32 registers (some of which may not be implemented). */ |
3764 | set_gdbarch_num_regs (gdbarch, 32); | |
3765 | set_gdbarch_sp_regnum (gdbarch, 14); | |
29134980 | 3766 | set_gdbarch_pc_regnum (gdbarch, 15); |
29134980 OF |
3767 | set_gdbarch_register_name (gdbarch, cris_register_name); |
3768 | ||
12c266ea | 3769 | /* Length of ordinary registers used in push_word and a few other |
3acba339 AC |
3770 | places. register_size() is the real way to know how big a |
3771 | register is. */ | |
b1e29e33 | 3772 | set_gdbarch_deprecated_register_size (gdbarch, 4); |
2e4b5889 OF |
3773 | set_gdbarch_double_bit (gdbarch, 64); |
3774 | /* The default definition of a long double is 2 * TARGET_DOUBLE_BIT, | |
3775 | which means we have to set this explicitly. */ | |
3776 | set_gdbarch_long_double_bit (gdbarch, 64); | |
29134980 | 3777 | set_gdbarch_register_bytes_ok (gdbarch, cris_register_bytes_ok); |
29134980 OF |
3778 | set_gdbarch_cannot_store_register (gdbarch, cris_cannot_store_register); |
3779 | set_gdbarch_cannot_fetch_register (gdbarch, cris_cannot_fetch_register); | |
3780 | ||
29134980 OF |
3781 | /* The total amount of space needed to store (in an array called registers) |
3782 | GDB's copy of the machine's register state. Note: We can not use | |
3783 | cris_register_size at this point, since it relies on current_gdbarch | |
3784 | being set. */ | |
3785 | switch (tdep->cris_version) | |
3786 | { | |
3787 | case 0: | |
3788 | case 1: | |
3789 | case 2: | |
3790 | case 3: | |
3791 | /* Support for these may be added later. */ | |
3792 | internal_error (__FILE__, __LINE__, "cris_gdbarch_init: unsupported CRIS version"); | |
3793 | break; | |
3794 | ||
3795 | case 8: | |
3796 | case 9: | |
3797 | /* CRIS v8 and v9, a.k.a. ETRAX 100. General registers R0 - R15 | |
3798 | (32 bits), special registers P0 - P1 (8 bits), P4 - P5 (16 bits), | |
3799 | and P8 - P14 (32 bits). */ | |
3800 | register_bytes = (16 * 4) + (2 * 1) + (2 * 2) + (7 * 4); | |
3801 | break; | |
3802 | ||
3803 | case 10: | |
3804 | case 11: | |
3805 | /* CRIS v10 and v11, a.k.a. ETRAX 100LX. In addition to ETRAX 100, | |
3806 | P7 (32 bits), and P15 (32 bits) have been implemented. */ | |
3807 | register_bytes = (16 * 4) + (2 * 1) + (2 * 2) + (9 * 4); | |
3808 | break; | |
3809 | ||
3810 | default: | |
3811 | internal_error (__FILE__, __LINE__, "cris_gdbarch_init: unknown CRIS version"); | |
3812 | } | |
3813 | ||
29134980 OF |
3814 | /* Returns the register offset for the first byte of register regno's space |
3815 | in the saved register state. */ | |
9c04cab7 | 3816 | set_gdbarch_deprecated_register_byte (gdbarch, cris_register_offset); |
29134980 | 3817 | |
c1d546cd | 3818 | set_gdbarch_register_type (gdbarch, cris_register_type); |
29134980 | 3819 | |
2e4b5889 OF |
3820 | /* Dummy frame functions. */ |
3821 | set_gdbarch_push_dummy_code (gdbarch, cris_push_dummy_code); | |
3822 | set_gdbarch_push_dummy_call (gdbarch, cris_push_dummy_call); | |
3823 | set_gdbarch_frame_align (gdbarch, cris_frame_align); | |
29134980 | 3824 | |
2e4b5889 | 3825 | set_gdbarch_software_single_step (gdbarch, cris_software_single_step); |
29134980 | 3826 | set_gdbarch_skip_prologue (gdbarch, cris_skip_prologue); |
29134980 OF |
3827 | |
3828 | /* The stack grows downward. */ | |
3829 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
3830 | ||
3831 | set_gdbarch_breakpoint_from_pc (gdbarch, cris_breakpoint_from_pc); | |
3832 | ||
2e4b5889 OF |
3833 | set_gdbarch_unwind_pc (gdbarch, cris_unwind_pc); |
3834 | set_gdbarch_unwind_sp (gdbarch, cris_unwind_sp); | |
3835 | set_gdbarch_unwind_dummy_id (gdbarch, cris_unwind_dummy_id); | |
3836 | ||
3837 | /* FIXME: Hook in the DWARF CFI frame unwinder. | |
3838 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
3839 | */ | |
3840 | frame_unwind_append_sniffer (gdbarch, cris_frame_sniffer); | |
3841 | frame_base_set_default (gdbarch, &cris_frame_base); | |
6c0e89ed | 3842 | |
dbbff683 OF |
3843 | /* Use target_specific function to define link map offsets. */ |
3844 | set_solib_svr4_fetch_link_map_offsets | |
3845 | (gdbarch, cris_linux_svr4_fetch_link_map_offsets); | |
3846 | ||
36482093 AC |
3847 | /* FIXME: cagney/2003-08-27: It should be possible to select a CRIS |
3848 | disassembler, even when there is no BFD. Does something like | |
3849 | "gdb; target remote; disassmeble *0x123" work? */ | |
3850 | set_gdbarch_print_insn (gdbarch, cris_delayed_get_disassembler); | |
3851 | ||
29134980 OF |
3852 | return gdbarch; |
3853 | } |