]>
Commit | Line | Data |
---|---|---|
4f460812 | 1 | /* Cache and manage frames for GDB, the GNU debugger. |
96cb11df AC |
2 | |
3 | Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, | |
51603483 | 4 | 2001, 2002, 2003 Free Software Foundation, Inc. |
d65fe839 AC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "target.h" | |
26 | #include "value.h" | |
39f77062 | 27 | #include "inferior.h" /* for inferior_ptid */ |
4e052eda | 28 | #include "regcache.h" |
4f460812 | 29 | #include "gdb_assert.h" |
e36180d7 AC |
30 | #include "gdb_string.h" |
31 | #include "builtin-regs.h" | |
4c1e7e9d AC |
32 | #include "gdb_obstack.h" |
33 | #include "dummy-frame.h" | |
34 | #include "gdbcore.h" | |
35 | #include "annotate.h" | |
6e7f8b9c | 36 | #include "language.h" |
494cca16 | 37 | #include "frame-unwind.h" |
d65fe839 | 38 | |
7a424e99 | 39 | /* Return a frame uniq ID that can be used to, later, re-find the |
101dcfbe AC |
40 | frame. */ |
41 | ||
7a424e99 AC |
42 | struct frame_id |
43 | get_frame_id (struct frame_info *fi) | |
101dcfbe AC |
44 | { |
45 | if (fi == NULL) | |
46 | { | |
7a424e99 | 47 | return null_frame_id; |
101dcfbe AC |
48 | } |
49 | else | |
50 | { | |
7a424e99 AC |
51 | struct frame_id id; |
52 | id.base = fi->frame; | |
53 | id.pc = fi->pc; | |
54 | return id; | |
101dcfbe AC |
55 | } |
56 | } | |
57 | ||
7a424e99 AC |
58 | const struct frame_id null_frame_id; /* All zeros. */ |
59 | ||
60 | struct frame_id | |
61 | frame_id_build (CORE_ADDR base, CORE_ADDR func_or_pc) | |
62 | { | |
63 | struct frame_id id; | |
64 | id.base = base; | |
65 | id.pc = func_or_pc; | |
66 | return id; | |
67 | } | |
68 | ||
69 | int | |
70 | frame_id_p (struct frame_id l) | |
71 | { | |
72 | /* The .func can be NULL but the .base cannot. */ | |
73 | return (l.base != 0); | |
74 | } | |
75 | ||
76 | int | |
77 | frame_id_eq (struct frame_id l, struct frame_id r) | |
78 | { | |
79 | /* If .base is different, the frames are different. */ | |
80 | if (l.base != r.base) | |
81 | return 0; | |
82 | /* Add a test to check that the frame ID's are for the same function | |
83 | here. */ | |
84 | return 1; | |
85 | } | |
86 | ||
87 | int | |
88 | frame_id_inner (struct frame_id l, struct frame_id r) | |
89 | { | |
90 | /* Only return non-zero when strictly inner than. Note that, per | |
91 | comment in "frame.h", there is some fuzz here. Frameless | |
92 | functions are not strictly inner than (same .base but different | |
93 | .func). */ | |
94 | return INNER_THAN (l.base, r.base); | |
95 | } | |
96 | ||
101dcfbe AC |
97 | struct frame_info * |
98 | frame_find_by_id (struct frame_id id) | |
99 | { | |
100 | struct frame_info *frame; | |
101 | ||
102 | /* ZERO denotes the null frame, let the caller decide what to do | |
103 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 104 | if (!frame_id_p (id)) |
101dcfbe AC |
105 | return NULL; |
106 | ||
107 | for (frame = get_current_frame (); | |
108 | frame != NULL; | |
109 | frame = get_prev_frame (frame)) | |
110 | { | |
7a424e99 AC |
111 | struct frame_id this = get_frame_id (frame); |
112 | if (frame_id_eq (id, this)) | |
113 | /* An exact match. */ | |
114 | return frame; | |
115 | if (frame_id_inner (id, this)) | |
116 | /* Gone to far. */ | |
101dcfbe | 117 | return NULL; |
7a424e99 AC |
118 | /* Either, we're not yet gone far enough out along the frame |
119 | chain (inner(this,id), or we're comparing frameless functions | |
120 | (same .base, different .func, no test available). Struggle | |
121 | on until we've definitly gone to far. */ | |
101dcfbe AC |
122 | } |
123 | return NULL; | |
124 | } | |
125 | ||
f18c5a73 AC |
126 | CORE_ADDR |
127 | frame_pc_unwind (struct frame_info *frame) | |
128 | { | |
129 | if (!frame->pc_unwind_cache_p) | |
130 | { | |
494cca16 | 131 | frame->pc_unwind_cache = frame->unwind->pc (frame, &frame->unwind_cache); |
f18c5a73 AC |
132 | frame->pc_unwind_cache_p = 1; |
133 | } | |
134 | return frame->pc_unwind_cache; | |
135 | } | |
136 | ||
c689142b AC |
137 | struct frame_id |
138 | frame_id_unwind (struct frame_info *frame) | |
139 | { | |
140 | if (!frame->id_unwind_cache_p) | |
141 | { | |
494cca16 | 142 | frame->unwind->id (frame, &frame->unwind_cache, &frame->id_unwind_cache); |
c689142b AC |
143 | frame->id_unwind_cache_p = 1; |
144 | } | |
145 | return frame->id_unwind_cache; | |
146 | } | |
147 | ||
148 | ||
4f460812 AC |
149 | void |
150 | frame_register_unwind (struct frame_info *frame, int regnum, | |
151 | int *optimizedp, enum lval_type *lvalp, | |
152 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
153 | { | |
154 | struct frame_unwind_cache *cache; | |
155 | ||
156 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates | |
157 | that the value proper does not need to be fetched. */ | |
158 | gdb_assert (optimizedp != NULL); | |
159 | gdb_assert (lvalp != NULL); | |
160 | gdb_assert (addrp != NULL); | |
161 | gdb_assert (realnump != NULL); | |
162 | /* gdb_assert (bufferp != NULL); */ | |
163 | ||
164 | /* NOTE: cagney/2002-04-14: It would be nice if, instead of a | |
165 | special case, there was always an inner frame dedicated to the | |
166 | hardware registers. Unfortunatly, there is too much unwind code | |
167 | around that looks up/down the frame chain while making the | |
168 | assumption that each frame level is using the same unwind code. */ | |
169 | ||
170 | if (frame == NULL) | |
171 | { | |
172 | /* We're in the inner-most frame, get the value direct from the | |
173 | register cache. */ | |
174 | *optimizedp = 0; | |
175 | *lvalp = lval_register; | |
fa5f27c7 AC |
176 | /* ULGH! Code uses the offset into the raw register byte array |
177 | as a way of identifying a register. */ | |
178 | *addrp = REGISTER_BYTE (regnum); | |
4f460812 AC |
179 | /* Should this code test ``register_cached (regnum) < 0'' and do |
180 | something like set realnum to -1 when the register isn't | |
181 | available? */ | |
182 | *realnump = regnum; | |
183 | if (bufferp) | |
4caf0990 | 184 | deprecated_read_register_gen (regnum, bufferp); |
4f460812 AC |
185 | return; |
186 | } | |
187 | ||
188 | /* Ask this frame to unwind its register. */ | |
494cca16 AC |
189 | frame->unwind->reg (frame, &frame->unwind_cache, regnum, |
190 | optimizedp, lvalp, addrp, realnump, bufferp); | |
4f460812 AC |
191 | } |
192 | ||
a216a322 AC |
193 | void |
194 | frame_register (struct frame_info *frame, int regnum, | |
195 | int *optimizedp, enum lval_type *lvalp, | |
196 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
197 | { | |
198 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates | |
199 | that the value proper does not need to be fetched. */ | |
200 | gdb_assert (optimizedp != NULL); | |
201 | gdb_assert (lvalp != NULL); | |
202 | gdb_assert (addrp != NULL); | |
203 | gdb_assert (realnump != NULL); | |
204 | /* gdb_assert (bufferp != NULL); */ | |
205 | ||
206 | /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset | |
207 | of the register in the register cache. It should instead return | |
208 | the REGNUM corresponding to that register. Translate the . */ | |
209 | if (GET_SAVED_REGISTER_P ()) | |
210 | { | |
211 | GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame, regnum, lvalp); | |
212 | /* Compute the REALNUM if the caller wants it. */ | |
213 | if (*lvalp == lval_register) | |
214 | { | |
215 | int regnum; | |
216 | for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++) | |
217 | { | |
218 | if (*addrp == register_offset_hack (current_gdbarch, regnum)) | |
219 | { | |
220 | *realnump = regnum; | |
221 | return; | |
222 | } | |
223 | } | |
224 | internal_error (__FILE__, __LINE__, | |
225 | "Failed to compute the register number corresponding" | |
226 | " to 0x%s", paddr_d (*addrp)); | |
227 | } | |
228 | *realnump = -1; | |
229 | return; | |
230 | } | |
231 | ||
232 | /* Reached the the bottom (youngest, inner most) of the frame chain | |
233 | (youngest, inner most) frame, go direct to the hardware register | |
234 | cache (do not pass go, do not try to cache the value, ...). The | |
235 | unwound value would have been cached in frame->next but that | |
236 | doesn't exist. This doesn't matter as the hardware register | |
237 | cache is stopping any unnecessary accesses to the target. */ | |
238 | ||
239 | /* NOTE: cagney/2002-04-14: It would be nice if, instead of a | |
240 | special case, there was always an inner frame dedicated to the | |
241 | hardware registers. Unfortunatly, there is too much unwind code | |
242 | around that looks up/down the frame chain while making the | |
243 | assumption that each frame level is using the same unwind code. */ | |
244 | ||
245 | if (frame == NULL) | |
246 | frame_register_unwind (NULL, regnum, optimizedp, lvalp, addrp, realnump, | |
247 | bufferp); | |
248 | else | |
249 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
250 | realnump, bufferp); | |
251 | } | |
252 | ||
135c175f AC |
253 | void |
254 | frame_unwind_signed_register (struct frame_info *frame, int regnum, | |
255 | LONGEST *val) | |
256 | { | |
257 | int optimized; | |
258 | CORE_ADDR addr; | |
259 | int realnum; | |
260 | enum lval_type lval; | |
261 | void *buf = alloca (MAX_REGISTER_RAW_SIZE); | |
262 | frame_register_unwind (frame, regnum, &optimized, &lval, &addr, | |
263 | &realnum, buf); | |
264 | (*val) = extract_signed_integer (buf, REGISTER_VIRTUAL_SIZE (regnum)); | |
265 | } | |
266 | ||
267 | void | |
268 | frame_unwind_unsigned_register (struct frame_info *frame, int regnum, | |
269 | ULONGEST *val) | |
270 | { | |
271 | int optimized; | |
272 | CORE_ADDR addr; | |
273 | int realnum; | |
274 | enum lval_type lval; | |
275 | void *buf = alloca (MAX_REGISTER_RAW_SIZE); | |
276 | frame_register_unwind (frame, regnum, &optimized, &lval, &addr, | |
277 | &realnum, buf); | |
278 | (*val) = extract_unsigned_integer (buf, REGISTER_VIRTUAL_SIZE (regnum)); | |
279 | } | |
4f460812 | 280 | |
f908a0eb AC |
281 | void |
282 | frame_read_unsigned_register (struct frame_info *frame, int regnum, | |
283 | ULONGEST *val) | |
284 | { | |
285 | /* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is | |
286 | always a frame. Both this, and the equivalent | |
287 | frame_read_signed_register() function, can only be called with a | |
288 | valid frame. If, for some reason, this function is called | |
289 | without a frame then the problem isn't here, but rather in the | |
290 | caller. It should of first created a frame and then passed that | |
291 | in. */ | |
292 | /* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the | |
293 | ``current_frame'' should not be treated as a special case. While | |
294 | ``get_next_frame (current_frame) == NULL'' currently holds, it | |
295 | should, as far as possible, not be relied upon. In the future, | |
296 | ``get_next_frame (current_frame)'' may instead simply return a | |
297 | normal frame object that simply always gets register values from | |
298 | the register cache. Consequently, frame code should try to avoid | |
299 | tests like ``if get_next_frame() == NULL'' and instead just rely | |
300 | on recursive frame calls (like the below code) when manipulating | |
301 | a frame chain. */ | |
302 | gdb_assert (frame != NULL); | |
303 | frame_unwind_unsigned_register (get_next_frame (frame), regnum, val); | |
304 | } | |
305 | ||
306 | void | |
307 | frame_read_signed_register (struct frame_info *frame, int regnum, | |
308 | LONGEST *val) | |
309 | { | |
310 | /* See note in frame_read_unsigned_register(). */ | |
311 | gdb_assert (frame != NULL); | |
312 | frame_unwind_signed_register (get_next_frame (frame), regnum, val); | |
313 | } | |
314 | ||
18cde8d5 | 315 | static void |
4f460812 AC |
316 | generic_unwind_get_saved_register (char *raw_buffer, |
317 | int *optimizedp, | |
318 | CORE_ADDR *addrp, | |
319 | struct frame_info *frame, | |
320 | int regnum, | |
321 | enum lval_type *lvalp) | |
322 | { | |
323 | int optimizedx; | |
324 | CORE_ADDR addrx; | |
325 | int realnumx; | |
326 | enum lval_type lvalx; | |
327 | ||
328 | if (!target_has_registers) | |
329 | error ("No registers."); | |
330 | ||
331 | /* Keep things simple, ensure that all the pointers (except valuep) | |
332 | are non NULL. */ | |
333 | if (optimizedp == NULL) | |
334 | optimizedp = &optimizedx; | |
335 | if (lvalp == NULL) | |
336 | lvalp = &lvalx; | |
337 | if (addrp == NULL) | |
338 | addrp = &addrx; | |
339 | ||
340 | /* Reached the the bottom (youngest, inner most) of the frame chain | |
341 | (youngest, inner most) frame, go direct to the hardware register | |
342 | cache (do not pass go, do not try to cache the value, ...). The | |
343 | unwound value would have been cached in frame->next but that | |
344 | doesn't exist. This doesn't matter as the hardware register | |
345 | cache is stopping any unnecessary accesses to the target. */ | |
346 | ||
347 | /* NOTE: cagney/2002-04-14: It would be nice if, instead of a | |
348 | special case, there was always an inner frame dedicated to the | |
349 | hardware registers. Unfortunatly, there is too much unwind code | |
350 | around that looks up/down the frame chain while making the | |
351 | assumption that each frame level is using the same unwind code. */ | |
352 | ||
353 | if (frame == NULL) | |
354 | frame_register_unwind (NULL, regnum, optimizedp, lvalp, addrp, &realnumx, | |
355 | raw_buffer); | |
356 | else | |
357 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
358 | &realnumx, raw_buffer); | |
359 | } | |
360 | ||
d65fe839 AC |
361 | void |
362 | get_saved_register (char *raw_buffer, | |
363 | int *optimized, | |
364 | CORE_ADDR *addrp, | |
365 | struct frame_info *frame, | |
366 | int regnum, | |
367 | enum lval_type *lval) | |
368 | { | |
a216a322 AC |
369 | if (GET_SAVED_REGISTER_P ()) |
370 | { | |
371 | GET_SAVED_REGISTER (raw_buffer, optimized, addrp, frame, regnum, lval); | |
372 | return; | |
373 | } | |
374 | generic_unwind_get_saved_register (raw_buffer, optimized, addrp, frame, | |
375 | regnum, lval); | |
d65fe839 AC |
376 | } |
377 | ||
cda5a58a | 378 | /* frame_register_read () |
d65fe839 | 379 | |
cda5a58a | 380 | Find and return the value of REGNUM for the specified stack frame. |
d65fe839 AC |
381 | The number of bytes copied is REGISTER_RAW_SIZE (REGNUM). |
382 | ||
cda5a58a | 383 | Returns 0 if the register value could not be found. */ |
d65fe839 | 384 | |
cda5a58a AC |
385 | int |
386 | frame_register_read (struct frame_info *frame, int regnum, void *myaddr) | |
d65fe839 | 387 | { |
a216a322 AC |
388 | int optimized; |
389 | enum lval_type lval; | |
390 | CORE_ADDR addr; | |
391 | int realnum; | |
392 | frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr); | |
d65fe839 | 393 | |
c97dcfc7 AC |
394 | /* FIXME: cagney/2002-05-15: This test, is just bogus. |
395 | ||
396 | It indicates that the target failed to supply a value for a | |
397 | register because it was "not available" at this time. Problem | |
398 | is, the target still has the register and so get saved_register() | |
399 | may be returning a value saved on the stack. */ | |
400 | ||
d65fe839 | 401 | if (register_cached (regnum) < 0) |
cda5a58a | 402 | return 0; /* register value not available */ |
d65fe839 | 403 | |
a216a322 | 404 | return !optimized; |
d65fe839 | 405 | } |
e36180d7 AC |
406 | |
407 | ||
408 | /* Map between a frame register number and its name. A frame register | |
409 | space is a superset of the cooked register space --- it also | |
410 | includes builtin registers. */ | |
411 | ||
412 | int | |
413 | frame_map_name_to_regnum (const char *name, int len) | |
414 | { | |
415 | int i; | |
416 | ||
417 | /* Search register name space. */ | |
418 | for (i = 0; i < NUM_REGS + NUM_PSEUDO_REGS; i++) | |
419 | if (REGISTER_NAME (i) && len == strlen (REGISTER_NAME (i)) | |
420 | && strncmp (name, REGISTER_NAME (i), len) == 0) | |
421 | { | |
422 | return i; | |
423 | } | |
424 | ||
425 | /* Try builtin registers. */ | |
426 | i = builtin_reg_map_name_to_regnum (name, len); | |
427 | if (i >= 0) | |
428 | { | |
429 | /* A builtin register doesn't fall into the architecture's | |
430 | register range. */ | |
431 | gdb_assert (i >= NUM_REGS + NUM_PSEUDO_REGS); | |
432 | return i; | |
433 | } | |
434 | ||
435 | return -1; | |
436 | } | |
437 | ||
438 | const char * | |
439 | frame_map_regnum_to_name (int regnum) | |
440 | { | |
441 | if (regnum < 0) | |
442 | return NULL; | |
443 | if (regnum < NUM_REGS + NUM_PSEUDO_REGS) | |
444 | return REGISTER_NAME (regnum); | |
445 | return builtin_reg_map_regnum_to_name (regnum); | |
446 | } | |
4c1e7e9d AC |
447 | |
448 | /* Info about the innermost stack frame (contents of FP register) */ | |
449 | ||
450 | static struct frame_info *current_frame; | |
451 | ||
452 | /* Cache for frame addresses already read by gdb. Valid only while | |
453 | inferior is stopped. Control variables for the frame cache should | |
454 | be local to this module. */ | |
455 | ||
456 | static struct obstack frame_cache_obstack; | |
457 | ||
458 | void * | |
479ab5a0 | 459 | frame_obstack_zalloc (unsigned long size) |
4c1e7e9d | 460 | { |
479ab5a0 AC |
461 | void *data = obstack_alloc (&frame_cache_obstack, size); |
462 | memset (data, 0, size); | |
463 | return data; | |
4c1e7e9d AC |
464 | } |
465 | ||
6baff1d2 | 466 | CORE_ADDR * |
4c1e7e9d AC |
467 | frame_saved_regs_zalloc (struct frame_info *fi) |
468 | { | |
469 | fi->saved_regs = (CORE_ADDR *) | |
479ab5a0 | 470 | frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); |
6baff1d2 | 471 | return fi->saved_regs; |
4c1e7e9d AC |
472 | } |
473 | ||
6baff1d2 AC |
474 | CORE_ADDR * |
475 | get_frame_saved_regs (struct frame_info *fi) | |
476 | { | |
477 | return fi->saved_regs; | |
478 | } | |
4c1e7e9d AC |
479 | |
480 | /* Return the innermost (currently executing) stack frame. */ | |
481 | ||
482 | struct frame_info * | |
483 | get_current_frame (void) | |
484 | { | |
485 | if (current_frame == NULL) | |
486 | { | |
487 | if (target_has_stack) | |
488 | current_frame = create_new_frame (read_fp (), read_pc ()); | |
489 | else | |
490 | error ("No stack."); | |
491 | } | |
492 | return current_frame; | |
493 | } | |
494 | ||
6e7f8b9c AC |
495 | /* The "selected" stack frame is used by default for local and arg |
496 | access. May be zero, for no selected frame. */ | |
497 | ||
498 | struct frame_info *deprecated_selected_frame; | |
499 | ||
500 | /* Return the selected frame. Always non-null (unless there isn't an | |
501 | inferior sufficient for creating a frame) in which case an error is | |
502 | thrown. */ | |
503 | ||
504 | struct frame_info * | |
505 | get_selected_frame (void) | |
506 | { | |
507 | if (deprecated_selected_frame == NULL) | |
508 | /* Hey! Don't trust this. It should really be re-finding the | |
509 | last selected frame of the currently selected thread. This, | |
510 | though, is better than nothing. */ | |
511 | select_frame (get_current_frame ()); | |
512 | /* There is always a frame. */ | |
513 | gdb_assert (deprecated_selected_frame != NULL); | |
514 | return deprecated_selected_frame; | |
515 | } | |
516 | ||
517 | /* Select frame FI (or NULL - to invalidate the current frame). */ | |
518 | ||
519 | void | |
520 | select_frame (struct frame_info *fi) | |
521 | { | |
522 | register struct symtab *s; | |
523 | ||
524 | deprecated_selected_frame = fi; | |
525 | /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the | |
526 | frame is being invalidated. */ | |
527 | if (selected_frame_level_changed_hook) | |
528 | selected_frame_level_changed_hook (frame_relative_level (fi)); | |
529 | ||
530 | /* FIXME: kseitz/2002-08-28: It would be nice to call | |
531 | selected_frame_level_changed_event right here, but due to limitations | |
532 | in the current interfaces, we would end up flooding UIs with events | |
533 | because select_frame is used extensively internally. | |
534 | ||
535 | Once we have frame-parameterized frame (and frame-related) commands, | |
536 | the event notification can be moved here, since this function will only | |
537 | be called when the users selected frame is being changed. */ | |
538 | ||
539 | /* Ensure that symbols for this frame are read in. Also, determine the | |
540 | source language of this frame, and switch to it if desired. */ | |
541 | if (fi) | |
542 | { | |
543 | s = find_pc_symtab (fi->pc); | |
544 | if (s | |
545 | && s->language != current_language->la_language | |
546 | && s->language != language_unknown | |
547 | && language_mode == language_mode_auto) | |
548 | { | |
549 | set_language (s->language); | |
550 | } | |
551 | } | |
552 | } | |
553 | ||
4c1e7e9d AC |
554 | /* Return the register saved in the simplistic ``saved_regs'' cache. |
555 | If the value isn't here AND a value is needed, try the next inner | |
556 | most frame. */ | |
557 | ||
558 | static void | |
559 | frame_saved_regs_register_unwind (struct frame_info *frame, void **cache, | |
560 | int regnum, int *optimizedp, | |
561 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
562 | int *realnump, void *bufferp) | |
563 | { | |
564 | /* There is always a frame at this point. And THIS is the frame | |
565 | we're interested in. */ | |
566 | gdb_assert (frame != NULL); | |
567 | /* If we're using generic dummy frames, we'd better not be in a call | |
568 | dummy. (generic_call_dummy_register_unwind ought to have been called | |
569 | instead.) */ | |
07555a72 | 570 | gdb_assert (!(DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
5e0f933e | 571 | && (get_frame_type (frame) == DUMMY_FRAME))); |
4c1e7e9d | 572 | |
8f871025 AC |
573 | /* Only (older) architectures that implement the |
574 | FRAME_INIT_SAVED_REGS method should be using this function. */ | |
575 | gdb_assert (FRAME_INIT_SAVED_REGS_P ()); | |
576 | ||
4c1e7e9d AC |
577 | /* Load the saved_regs register cache. */ |
578 | if (frame->saved_regs == NULL) | |
579 | FRAME_INIT_SAVED_REGS (frame); | |
580 | ||
581 | if (frame->saved_regs != NULL | |
582 | && frame->saved_regs[regnum] != 0) | |
583 | { | |
584 | if (regnum == SP_REGNUM) | |
585 | { | |
586 | /* SP register treated specially. */ | |
587 | *optimizedp = 0; | |
588 | *lvalp = not_lval; | |
589 | *addrp = 0; | |
590 | *realnump = -1; | |
591 | if (bufferp != NULL) | |
592 | store_address (bufferp, REGISTER_RAW_SIZE (regnum), | |
593 | frame->saved_regs[regnum]); | |
594 | } | |
595 | else | |
596 | { | |
597 | /* Any other register is saved in memory, fetch it but cache | |
598 | a local copy of its value. */ | |
599 | *optimizedp = 0; | |
600 | *lvalp = lval_memory; | |
601 | *addrp = frame->saved_regs[regnum]; | |
602 | *realnump = -1; | |
603 | if (bufferp != NULL) | |
604 | { | |
605 | #if 1 | |
606 | /* Save each register value, as it is read in, in a | |
607 | frame based cache. */ | |
608 | void **regs = (*cache); | |
609 | if (regs == NULL) | |
610 | { | |
611 | int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS) | |
612 | * sizeof (void *)); | |
479ab5a0 | 613 | regs = frame_obstack_zalloc (sizeof_cache); |
4c1e7e9d AC |
614 | (*cache) = regs; |
615 | } | |
616 | if (regs[regnum] == NULL) | |
617 | { | |
618 | regs[regnum] | |
479ab5a0 | 619 | = frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
620 | read_memory (frame->saved_regs[regnum], regs[regnum], |
621 | REGISTER_RAW_SIZE (regnum)); | |
622 | } | |
623 | memcpy (bufferp, regs[regnum], REGISTER_RAW_SIZE (regnum)); | |
624 | #else | |
625 | /* Read the value in from memory. */ | |
626 | read_memory (frame->saved_regs[regnum], bufferp, | |
627 | REGISTER_RAW_SIZE (regnum)); | |
628 | #endif | |
629 | } | |
630 | } | |
631 | return; | |
632 | } | |
633 | ||
634 | /* No luck, assume this and the next frame have the same register | |
635 | value. If a value is needed, pass the request on down the chain; | |
636 | otherwise just return an indication that the value is in the same | |
637 | register as the next frame. */ | |
638 | if (bufferp == NULL) | |
639 | { | |
640 | *optimizedp = 0; | |
641 | *lvalp = lval_register; | |
642 | *addrp = 0; | |
643 | *realnump = regnum; | |
644 | } | |
645 | else | |
646 | { | |
647 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
648 | realnump, bufferp); | |
649 | } | |
650 | } | |
651 | ||
f18c5a73 AC |
652 | static CORE_ADDR |
653 | frame_saved_regs_pc_unwind (struct frame_info *frame, void **cache) | |
654 | { | |
655 | return FRAME_SAVED_PC (frame); | |
656 | } | |
657 | ||
c170fb60 AC |
658 | static void |
659 | frame_saved_regs_id_unwind (struct frame_info *next_frame, void **cache, | |
660 | struct frame_id *id) | |
c689142b AC |
661 | { |
662 | int fromleaf; | |
c170fb60 AC |
663 | CORE_ADDR base; |
664 | CORE_ADDR pc; | |
665 | ||
666 | /* Start out by assuming it's NULL. */ | |
667 | (*id) = null_frame_id; | |
c689142b AC |
668 | |
669 | if (next_frame->next == NULL) | |
670 | /* FIXME: 2002-11-09: Frameless functions can occure anywhere in | |
671 | the frame chain, not just the inner most frame! The generic, | |
672 | per-architecture, frame code should handle this and the below | |
673 | should simply be removed. */ | |
674 | fromleaf = FRAMELESS_FUNCTION_INVOCATION (next_frame); | |
675 | else | |
676 | fromleaf = 0; | |
677 | ||
678 | if (fromleaf) | |
679 | /* A frameless inner-most frame. The `FP' (which isn't an | |
680 | architecture frame-pointer register!) of the caller is the same | |
681 | as the callee. */ | |
682 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
683 | edge condition. Instead the per-architecture code should hande | |
684 | it locally. */ | |
c170fb60 | 685 | base = get_frame_base (next_frame); |
c689142b AC |
686 | else |
687 | { | |
688 | /* Two macros defined in tm.h specify the machine-dependent | |
689 | actions to be performed here. | |
690 | ||
691 | First, get the frame's chain-pointer. | |
692 | ||
693 | If that is zero, the frame is the outermost frame or a leaf | |
694 | called by the outermost frame. This means that if start | |
695 | calls main without a frame, we'll return 0 (which is fine | |
696 | anyway). | |
697 | ||
698 | Nope; there's a problem. This also returns when the current | |
699 | routine is a leaf of main. This is unacceptable. We move | |
700 | this to after the ffi test; I'd rather have backtraces from | |
701 | start go curfluy than have an abort called from main not show | |
702 | main. */ | |
c170fb60 | 703 | base = FRAME_CHAIN (next_frame); |
c689142b | 704 | |
c170fb60 AC |
705 | if (!frame_chain_valid (base, next_frame)) |
706 | return; | |
c689142b | 707 | } |
c170fb60 AC |
708 | if (base == 0) |
709 | return; | |
c689142b AC |
710 | |
711 | /* FIXME: cagney/2002-06-08: This should probably return the frame's | |
712 | function and not the PC (a.k.a. resume address). */ | |
c170fb60 AC |
713 | pc = frame_pc_unwind (next_frame); |
714 | id->pc = pc; | |
715 | id->base = base; | |
c689142b AC |
716 | } |
717 | ||
494cca16 AC |
718 | const struct frame_unwind trad_frame_unwinder = { |
719 | frame_saved_regs_pc_unwind, | |
720 | frame_saved_regs_id_unwind, | |
721 | frame_saved_regs_register_unwind | |
722 | }; | |
723 | const struct frame_unwind *trad_frame_unwind = &trad_frame_unwinder; | |
724 | ||
725 | ||
4c1e7e9d AC |
726 | /* Function: get_saved_register |
727 | Find register number REGNUM relative to FRAME and put its (raw, | |
728 | target format) contents in *RAW_BUFFER. | |
729 | ||
730 | Set *OPTIMIZED if the variable was optimized out (and thus can't be | |
731 | fetched). Note that this is never set to anything other than zero | |
732 | in this implementation. | |
733 | ||
734 | Set *LVAL to lval_memory, lval_register, or not_lval, depending on | |
735 | whether the value was fetched from memory, from a register, or in a | |
736 | strange and non-modifiable way (e.g. a frame pointer which was | |
737 | calculated rather than fetched). We will use not_lval for values | |
738 | fetched from generic dummy frames. | |
739 | ||
740 | Set *ADDRP to the address, either in memory or as a REGISTER_BYTE | |
741 | offset into the registers array. If the value is stored in a dummy | |
742 | frame, set *ADDRP to zero. | |
743 | ||
744 | To use this implementation, define a function called | |
745 | "get_saved_register" in your target code, which simply passes all | |
746 | of its arguments to this function. | |
747 | ||
748 | The argument RAW_BUFFER must point to aligned memory. */ | |
749 | ||
750 | void | |
751 | deprecated_generic_get_saved_register (char *raw_buffer, int *optimized, | |
752 | CORE_ADDR *addrp, | |
753 | struct frame_info *frame, int regnum, | |
754 | enum lval_type *lval) | |
755 | { | |
756 | if (!target_has_registers) | |
757 | error ("No registers."); | |
758 | ||
8f871025 AC |
759 | gdb_assert (FRAME_INIT_SAVED_REGS_P ()); |
760 | ||
4c1e7e9d AC |
761 | /* Normal systems don't optimize out things with register numbers. */ |
762 | if (optimized != NULL) | |
763 | *optimized = 0; | |
764 | ||
765 | if (addrp) /* default assumption: not found in memory */ | |
766 | *addrp = 0; | |
767 | ||
768 | /* Note: since the current frame's registers could only have been | |
769 | saved by frames INTERIOR TO the current frame, we skip examining | |
770 | the current frame itself: otherwise, we would be getting the | |
771 | previous frame's registers which were saved by the current frame. */ | |
772 | ||
773 | while (frame && ((frame = frame->next) != NULL)) | |
774 | { | |
5e0f933e | 775 | if (get_frame_type (frame) == DUMMY_FRAME) |
4c1e7e9d AC |
776 | { |
777 | if (lval) /* found it in a CALL_DUMMY frame */ | |
778 | *lval = not_lval; | |
779 | if (raw_buffer) | |
780 | /* FIXME: cagney/2002-06-26: This should be via the | |
781 | gdbarch_register_read() method so that it, on the fly, | |
782 | constructs either a raw or pseudo register from the raw | |
783 | register cache. */ | |
784 | regcache_raw_read (generic_find_dummy_frame (frame->pc, | |
785 | frame->frame), | |
786 | regnum, raw_buffer); | |
787 | return; | |
788 | } | |
789 | ||
790 | FRAME_INIT_SAVED_REGS (frame); | |
791 | if (frame->saved_regs != NULL | |
792 | && frame->saved_regs[regnum] != 0) | |
793 | { | |
794 | if (lval) /* found it saved on the stack */ | |
795 | *lval = lval_memory; | |
796 | if (regnum == SP_REGNUM) | |
797 | { | |
798 | if (raw_buffer) /* SP register treated specially */ | |
799 | store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), | |
800 | frame->saved_regs[regnum]); | |
801 | } | |
802 | else | |
803 | { | |
804 | if (addrp) /* any other register */ | |
805 | *addrp = frame->saved_regs[regnum]; | |
806 | if (raw_buffer) | |
807 | read_memory (frame->saved_regs[regnum], raw_buffer, | |
808 | REGISTER_RAW_SIZE (regnum)); | |
809 | } | |
810 | return; | |
811 | } | |
812 | } | |
813 | ||
814 | /* If we get thru the loop to this point, it means the register was | |
815 | not saved in any frame. Return the actual live-register value. */ | |
816 | ||
817 | if (lval) /* found it in a live register */ | |
818 | *lval = lval_register; | |
819 | if (addrp) | |
820 | *addrp = REGISTER_BYTE (regnum); | |
821 | if (raw_buffer) | |
822 | deprecated_read_register_gen (regnum, raw_buffer); | |
823 | } | |
824 | ||
4c1e7e9d AC |
825 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. |
826 | Always returns a non-NULL value. */ | |
827 | ||
828 | struct frame_info * | |
829 | create_new_frame (CORE_ADDR addr, CORE_ADDR pc) | |
830 | { | |
831 | struct frame_info *fi; | |
5a203e44 | 832 | enum frame_type type; |
4c1e7e9d | 833 | |
479ab5a0 | 834 | fi = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d AC |
835 | |
836 | fi->frame = addr; | |
837 | fi->pc = pc; | |
5a203e44 AC |
838 | /* NOTE: cagney/2002-11-18: The code segments, found in |
839 | create_new_frame and get_prev_frame(), that initializes the | |
840 | frames type is subtly different. The latter only updates ->type | |
841 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops | |
842 | get_prev_frame() overriding the frame's type when the INIT code | |
843 | has previously set it. This is really somewhat bogus. The | |
844 | initialization, as seen in create_new_frame(), should occur | |
845 | before the INIT function has been called. */ | |
ae45cd16 AC |
846 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
847 | && (DEPRECATED_PC_IN_CALL_DUMMY_P () | |
848 | ? DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0) | |
849 | : pc_in_dummy_frame (pc))) | |
5a203e44 AC |
850 | /* NOTE: cagney/2002-11-11: Does this even occure? */ |
851 | type = DUMMY_FRAME; | |
852 | else | |
853 | { | |
854 | char *name; | |
855 | find_pc_partial_function (pc, &name, NULL, NULL); | |
856 | if (PC_IN_SIGTRAMP (fi->pc, name)) | |
857 | type = SIGTRAMP_FRAME; | |
858 | else | |
859 | type = NORMAL_FRAME; | |
860 | } | |
861 | fi->type = type; | |
4c1e7e9d AC |
862 | |
863 | if (INIT_EXTRA_FRAME_INFO_P ()) | |
864 | INIT_EXTRA_FRAME_INFO (0, fi); | |
865 | ||
866 | /* Select/initialize an unwind function. */ | |
494cca16 | 867 | fi->unwind = frame_unwind_find_by_pc (current_gdbarch, fi->pc); |
4c1e7e9d AC |
868 | |
869 | return fi; | |
870 | } | |
871 | ||
872 | /* Return the frame that FRAME calls (NULL if FRAME is the innermost | |
873 | frame). */ | |
874 | ||
875 | struct frame_info * | |
876 | get_next_frame (struct frame_info *frame) | |
877 | { | |
878 | return frame->next; | |
879 | } | |
880 | ||
881 | /* Flush the entire frame cache. */ | |
882 | ||
883 | void | |
884 | flush_cached_frames (void) | |
885 | { | |
886 | /* Since we can't really be sure what the first object allocated was */ | |
887 | obstack_free (&frame_cache_obstack, 0); | |
888 | obstack_init (&frame_cache_obstack); | |
889 | ||
890 | current_frame = NULL; /* Invalidate cache */ | |
891 | select_frame (NULL); | |
892 | annotate_frames_invalid (); | |
893 | } | |
894 | ||
895 | /* Flush the frame cache, and start a new one if necessary. */ | |
896 | ||
897 | void | |
898 | reinit_frame_cache (void) | |
899 | { | |
900 | flush_cached_frames (); | |
901 | ||
902 | /* FIXME: The inferior_ptid test is wrong if there is a corefile. */ | |
903 | if (PIDGET (inferior_ptid) != 0) | |
904 | { | |
905 | select_frame (get_current_frame ()); | |
906 | } | |
907 | } | |
908 | ||
909 | /* Return a structure containing various interesting information | |
910 | about the frame that called NEXT_FRAME. Returns NULL | |
911 | if there is no such frame. */ | |
912 | ||
913 | struct frame_info * | |
914 | get_prev_frame (struct frame_info *next_frame) | |
915 | { | |
916 | CORE_ADDR address = 0; | |
917 | struct frame_info *prev; | |
95adb866 | 918 | int fromleaf; |
4c1e7e9d | 919 | |
95adb866 AC |
920 | /* Return the inner-most frame, when the caller passes in NULL. */ |
921 | /* NOTE: cagney/2002-11-09: Not sure how this would happen. The | |
922 | caller should have previously obtained a valid frame using | |
923 | get_selected_frame() and then called this code - only possibility | |
924 | I can think of is code behaving badly. */ | |
925 | if (next_frame == NULL) | |
4c1e7e9d | 926 | { |
95adb866 AC |
927 | /* NOTE: cagney/2002-11-09: There was a code segment here that |
928 | would error out when CURRENT_FRAME was NULL. The comment | |
929 | that went with it made the claim ... | |
930 | ||
931 | ``This screws value_of_variable, which just wants a nice | |
932 | clean NULL return from block_innermost_frame if there are no | |
933 | frames. I don't think I've ever seen this message happen | |
934 | otherwise. And returning NULL here is a perfectly legitimate | |
935 | thing to do.'' | |
936 | ||
937 | Per the above, this code shouldn't even be called with a NULL | |
938 | NEXT_FRAME. */ | |
4c1e7e9d AC |
939 | return current_frame; |
940 | } | |
941 | ||
15220c65 AC |
942 | /* Only try to do the unwind once. */ |
943 | if (next_frame->prev_p) | |
4c1e7e9d | 944 | return next_frame->prev; |
15220c65 | 945 | next_frame->prev_p = 1; |
4c1e7e9d AC |
946 | |
947 | /* On some machines it is possible to call a function without | |
948 | setting up a stack frame for it. On these machines, we | |
949 | define this macro to take two args; a frameinfo pointer | |
950 | identifying a frame and a variable to set or clear if it is | |
951 | or isn't leafless. */ | |
952 | ||
953 | /* Still don't want to worry about this except on the innermost | |
95adb866 AC |
954 | frame. This macro will set FROMLEAF if NEXT_FRAME is a frameless |
955 | function invocation. */ | |
956 | if (next_frame->next == NULL) | |
957 | /* FIXME: 2002-11-09: Frameless functions can occure anywhere in | |
958 | the frame chain, not just the inner most frame! The generic, | |
959 | per-architecture, frame code should handle this and the below | |
960 | should simply be removed. */ | |
961 | fromleaf = FRAMELESS_FUNCTION_INVOCATION (next_frame); | |
962 | else | |
963 | fromleaf = 0; | |
964 | ||
965 | if (fromleaf) | |
966 | /* A frameless inner-most frame. The `FP' (which isn't an | |
967 | architecture frame-pointer register!) of the caller is the same | |
968 | as the callee. */ | |
969 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
970 | edge condition. Instead the per-architecture code should hande | |
971 | it locally. */ | |
c193f6ac | 972 | address = get_frame_base (next_frame); |
95adb866 | 973 | else |
4c1e7e9d AC |
974 | { |
975 | /* Two macros defined in tm.h specify the machine-dependent | |
976 | actions to be performed here. | |
95adb866 | 977 | |
4c1e7e9d | 978 | First, get the frame's chain-pointer. |
95adb866 | 979 | |
4c1e7e9d AC |
980 | If that is zero, the frame is the outermost frame or a leaf |
981 | called by the outermost frame. This means that if start | |
982 | calls main without a frame, we'll return 0 (which is fine | |
983 | anyway). | |
984 | ||
985 | Nope; there's a problem. This also returns when the current | |
986 | routine is a leaf of main. This is unacceptable. We move | |
987 | this to after the ffi test; I'd rather have backtraces from | |
988 | start go curfluy than have an abort called from main not show | |
989 | main. */ | |
990 | address = FRAME_CHAIN (next_frame); | |
991 | ||
51603483 | 992 | if (!frame_chain_valid (address, next_frame)) |
4c1e7e9d AC |
993 | return 0; |
994 | } | |
995 | if (address == 0) | |
996 | return 0; | |
997 | ||
95adb866 | 998 | /* Create an initially zero previous frame. */ |
479ab5a0 | 999 | prev = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d | 1000 | |
95adb866 AC |
1001 | /* Link it in. */ |
1002 | next_frame->prev = prev; | |
4c1e7e9d AC |
1003 | prev->next = next_frame; |
1004 | prev->frame = address; | |
1005 | prev->level = next_frame->level + 1; | |
5a203e44 AC |
1006 | /* FIXME: cagney/2002-11-18: Should be setting the frame's type |
1007 | here, before anything else, and not last. Various INIT functions | |
1008 | are full of work-arounds for the frames type not being set | |
1009 | correctly from the word go. Ulgh! */ | |
1010 | prev->type = NORMAL_FRAME; | |
4c1e7e9d | 1011 | |
95adb866 | 1012 | /* This change should not be needed, FIXME! We should determine |
a5afb99f AC |
1013 | whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen |
1014 | after INIT_EXTRA_FRAME_INFO and come up with a simple way to | |
1015 | express what goes on here. | |
95adb866 AC |
1016 | |
1017 | INIT_EXTRA_FRAME_INFO is called from two places: create_new_frame | |
1018 | (where the PC is already set up) and here (where it isn't). | |
a5afb99f | 1019 | DEPRECATED_INIT_FRAME_PC is only called from here, always after |
95adb866 AC |
1020 | INIT_EXTRA_FRAME_INFO. |
1021 | ||
1022 | The catch is the MIPS, where INIT_EXTRA_FRAME_INFO requires the | |
1023 | PC value (which hasn't been set yet). Some other machines appear | |
1024 | to require INIT_EXTRA_FRAME_INFO before they can do | |
a5afb99f | 1025 | DEPRECATED_INIT_FRAME_PC. Phoo. |
95adb866 | 1026 | |
2ca6c561 AC |
1027 | We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more |
1028 | complication to an already overcomplicated part of GDB. | |
1029 | gnu@cygnus.com, 15Sep92. | |
95adb866 | 1030 | |
a5afb99f | 1031 | Assuming that some machines need DEPRECATED_INIT_FRAME_PC after |
95adb866 AC |
1032 | INIT_EXTRA_FRAME_INFO, one possible scheme: |
1033 | ||
1034 | SETUP_INNERMOST_FRAME(): Default version is just create_new_frame | |
1035 | (read_fp ()), read_pc ()). Machines with extra frame info would | |
1036 | do that (or the local equivalent) and then set the extra fields. | |
1037 | ||
1038 | SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that | |
1039 | create_new_frame would no longer init extra frame info; | |
1040 | SETUP_ARBITRARY_FRAME would have to do that. | |
1041 | ||
1042 | INIT_PREV_FRAME(fromleaf, prev) Replace INIT_EXTRA_FRAME_INFO and | |
a5afb99f AC |
1043 | DEPRECATED_INIT_FRAME_PC. This should also return a flag saying |
1044 | whether to keep the new frame, or whether to discard it, because | |
1045 | on some machines (e.g. mips) it is really awkward to have | |
95adb866 AC |
1046 | FRAME_CHAIN_VALID called *before* INIT_EXTRA_FRAME_INFO (there is |
1047 | no good way to get information deduced in FRAME_CHAIN_VALID into | |
1048 | the extra fields of the new frame). std_frame_pc(fromleaf, prev) | |
1049 | ||
1050 | This is the default setting for INIT_PREV_FRAME. It just does | |
a5afb99f AC |
1051 | what the default DEPRECATED_INIT_FRAME_PC does. Some machines |
1052 | will call it from INIT_PREV_FRAME (either at the beginning, the | |
1053 | end, or in the middle). Some machines won't use it. | |
95adb866 AC |
1054 | |
1055 | kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */ | |
1056 | ||
1057 | /* NOTE: cagney/2002-11-09: Just ignore the above! There is no | |
1058 | reason for things to be this complicated. | |
1059 | ||
1060 | The trick is to assume that there is always a frame. Instead of | |
1061 | special casing the inner-most frame, create fake frame | |
1062 | (containing the hardware registers) that is inner to the | |
1063 | user-visible inner-most frame (...) and then unwind from that. | |
1064 | That way architecture code can use use the standard | |
1065 | frame_XX_unwind() functions and not differentiate between the | |
1066 | inner most and any other case. | |
1067 | ||
1068 | Since there is always a frame to unwind from, there is always | |
1069 | somewhere (NEXT_FRAME) to store all the info needed to construct | |
1070 | a new (previous) frame without having to first create it. This | |
1071 | means that the convolution below - needing to carefully order a | |
1072 | frame's initialization - isn't needed. | |
1073 | ||
1074 | The irony here though, is that FRAME_CHAIN(), at least for a more | |
1075 | up-to-date architecture, always calls FRAME_SAVED_PC(), and | |
1076 | FRAME_SAVED_PC() computes the PC but without first needing the | |
1077 | frame! Instead of the convolution below, we could have simply | |
1078 | called FRAME_SAVED_PC() and been done with it! Note that | |
1079 | FRAME_SAVED_PC() is being superseed by frame_pc_unwind() and that | |
1080 | function does have somewhere to cache that PC value. */ | |
4c1e7e9d | 1081 | |
2ca6c561 | 1082 | if (DEPRECATED_INIT_FRAME_PC_FIRST_P ()) |
97f46953 | 1083 | prev->pc = (DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf, prev)); |
4c1e7e9d AC |
1084 | |
1085 | if (INIT_EXTRA_FRAME_INFO_P ()) | |
1086 | INIT_EXTRA_FRAME_INFO (fromleaf, prev); | |
1087 | ||
1088 | /* This entry is in the frame queue now, which is good since | |
95adb866 AC |
1089 | FRAME_SAVED_PC may use that queue to figure out its value (see |
1090 | tm-sparc.h). We want the pc saved in the inferior frame. */ | |
a5afb99f AC |
1091 | if (DEPRECATED_INIT_FRAME_PC_P ()) |
1092 | prev->pc = DEPRECATED_INIT_FRAME_PC (fromleaf, prev); | |
4c1e7e9d | 1093 | |
95adb866 AC |
1094 | /* If ->frame and ->pc are unchanged, we are in the process of |
1095 | getting ourselves into an infinite backtrace. Some architectures | |
1096 | check this in FRAME_CHAIN or thereabouts, but it seems like there | |
1097 | is no reason this can't be an architecture-independent check. */ | |
1098 | if (prev->frame == next_frame->frame | |
1099 | && prev->pc == next_frame->pc) | |
4c1e7e9d | 1100 | { |
95adb866 AC |
1101 | next_frame->prev = NULL; |
1102 | obstack_free (&frame_cache_obstack, prev); | |
1103 | return NULL; | |
4c1e7e9d AC |
1104 | } |
1105 | ||
1106 | /* Initialize the code used to unwind the frame PREV based on the PC | |
1107 | (and probably other architectural information). The PC lets you | |
1108 | check things like the debug info at that point (dwarf2cfi?) and | |
1109 | use that to decide how the frame should be unwound. */ | |
494cca16 | 1110 | prev->unwind = frame_unwind_find_by_pc (current_gdbarch, prev->pc); |
4c1e7e9d | 1111 | |
5a203e44 AC |
1112 | /* NOTE: cagney/2002-11-18: The code segments, found in |
1113 | create_new_frame and get_prev_frame(), that initializes the | |
1114 | frames type is subtly different. The latter only updates ->type | |
1115 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops | |
1116 | get_prev_frame() overriding the frame's type when the INIT code | |
1117 | has previously set it. This is really somewhat bogus. The | |
1118 | initialization, as seen in create_new_frame(), should occur | |
1119 | before the INIT function has been called. */ | |
07555a72 | 1120 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
ae45cd16 AC |
1121 | && (DEPRECATED_PC_IN_CALL_DUMMY_P () |
1122 | ? DEPRECATED_PC_IN_CALL_DUMMY (prev->pc, 0, 0) | |
1123 | : pc_in_dummy_frame (prev->pc))) | |
5a203e44 AC |
1124 | prev->type = DUMMY_FRAME; |
1125 | else | |
1126 | { | |
1127 | /* FIXME: cagney/2002-11-10: This should be moved to before the | |
1128 | INIT code above so that the INIT code knows what the frame's | |
1129 | type is (in fact, for a [generic] dummy-frame, the type can | |
1130 | be set and then the entire initialization can be skipped. | |
1131 | Unforunatly, its the INIT code that sets the PC (Hmm, catch | |
1132 | 22). */ | |
1133 | char *name; | |
1134 | find_pc_partial_function (prev->pc, &name, NULL, NULL); | |
1135 | if (PC_IN_SIGTRAMP (prev->pc, name)) | |
1136 | prev->type = SIGTRAMP_FRAME; | |
1137 | /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some | |
1138 | architectures are forcing the frame's type in INIT so we | |
1139 | don't want to override it here. Remember, NORMAL_FRAME == 0, | |
1140 | so it all works (just :-/). Once this initialization is | |
1141 | moved to the start of this function, all this nastness will | |
1142 | go away. */ | |
1143 | } | |
4c1e7e9d AC |
1144 | |
1145 | return prev; | |
1146 | } | |
1147 | ||
1148 | CORE_ADDR | |
1149 | get_frame_pc (struct frame_info *frame) | |
1150 | { | |
1151 | return frame->pc; | |
1152 | } | |
1153 | ||
1058bca7 AC |
1154 | static int |
1155 | pc_notcurrent (struct frame_info *frame) | |
1156 | { | |
1157 | /* If FRAME is not the innermost frame, that normally means that | |
1158 | FRAME->pc points at the return instruction (which is *after* the | |
1159 | call instruction), and we want to get the line containing the | |
1160 | call (because the call is where the user thinks the program is). | |
1161 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
1162 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
1163 | PC and such a PC indicates the current (rather than next) | |
1164 | instruction/line, consequently, for such cases, want to get the | |
1165 | line containing fi->pc. */ | |
1166 | struct frame_info *next = get_next_frame (frame); | |
1167 | int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME); | |
1168 | return notcurrent; | |
1169 | } | |
1170 | ||
1171 | void | |
1172 | find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal) | |
1173 | { | |
1174 | (*sal) = find_pc_line (frame->pc, pc_notcurrent (frame)); | |
1175 | } | |
1176 | ||
c193f6ac AC |
1177 | /* Per "frame.h", return the ``address'' of the frame. Code should |
1178 | really be using get_frame_id(). */ | |
1179 | CORE_ADDR | |
1180 | get_frame_base (struct frame_info *fi) | |
1181 | { | |
1182 | return fi->frame; | |
1183 | } | |
1184 | ||
85cf597a AC |
1185 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
1186 | or -1 for a NULL frame. */ | |
1187 | ||
1188 | int | |
1189 | frame_relative_level (struct frame_info *fi) | |
1190 | { | |
1191 | if (fi == NULL) | |
1192 | return -1; | |
1193 | else | |
1194 | return fi->level; | |
1195 | } | |
1196 | ||
5a203e44 AC |
1197 | enum frame_type |
1198 | get_frame_type (struct frame_info *frame) | |
1199 | { | |
1200 | /* Some targets still don't use [generic] dummy frames. Catch them | |
1201 | here. */ | |
07555a72 | 1202 | if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
5a203e44 AC |
1203 | && deprecated_frame_in_dummy (frame)) |
1204 | return DUMMY_FRAME; | |
1205 | return frame->type; | |
1206 | } | |
1207 | ||
1208 | void | |
1209 | deprecated_set_frame_type (struct frame_info *frame, enum frame_type type) | |
1210 | { | |
1211 | /* Arrrg! See comment in "frame.h". */ | |
1212 | frame->type = type; | |
1213 | } | |
1214 | ||
4c1e7e9d AC |
1215 | #ifdef FRAME_FIND_SAVED_REGS |
1216 | /* XXX - deprecated. This is a compatibility function for targets | |
1217 | that do not yet implement FRAME_INIT_SAVED_REGS. */ | |
1218 | /* Find the addresses in which registers are saved in FRAME. */ | |
1219 | ||
1220 | void | |
95486978 AC |
1221 | deprecated_get_frame_saved_regs (struct frame_info *frame, |
1222 | struct frame_saved_regs *saved_regs_addr) | |
4c1e7e9d AC |
1223 | { |
1224 | if (frame->saved_regs == NULL) | |
1225 | { | |
1226 | frame->saved_regs = (CORE_ADDR *) | |
479ab5a0 | 1227 | frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); |
4c1e7e9d AC |
1228 | } |
1229 | if (saved_regs_addr == NULL) | |
1230 | { | |
1231 | struct frame_saved_regs saved_regs; | |
1232 | FRAME_FIND_SAVED_REGS (frame, saved_regs); | |
1233 | memcpy (frame->saved_regs, &saved_regs, SIZEOF_FRAME_SAVED_REGS); | |
1234 | } | |
1235 | else | |
1236 | { | |
1237 | FRAME_FIND_SAVED_REGS (frame, *saved_regs_addr); | |
1238 | memcpy (frame->saved_regs, saved_regs_addr, SIZEOF_FRAME_SAVED_REGS); | |
1239 | } | |
1240 | } | |
1241 | #endif | |
1242 | ||
0394eb2a AC |
1243 | struct frame_extra_info * |
1244 | get_frame_extra_info (struct frame_info *fi) | |
1245 | { | |
1246 | return fi->extra_info; | |
1247 | } | |
1248 | ||
2c517d0e AC |
1249 | struct frame_extra_info * |
1250 | frame_extra_info_zalloc (struct frame_info *fi, long size) | |
1251 | { | |
479ab5a0 | 1252 | fi->extra_info = frame_obstack_zalloc (size); |
2c517d0e AC |
1253 | return fi->extra_info; |
1254 | } | |
1255 | ||
b87efeee | 1256 | void |
2f107107 | 1257 | deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc) |
b87efeee | 1258 | { |
2f107107 AC |
1259 | /* See comment in "frame.h". */ |
1260 | frame->pc = pc; | |
1261 | } | |
1262 | ||
1263 | void | |
1264 | deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base) | |
1265 | { | |
1266 | /* See comment in "frame.h". */ | |
1267 | frame->frame = base; | |
b87efeee AC |
1268 | } |
1269 | ||
c8b8a898 AC |
1270 | void |
1271 | deprecated_set_frame_saved_regs_hack (struct frame_info *frame, | |
1272 | CORE_ADDR *saved_regs) | |
1273 | { | |
1274 | frame->saved_regs = saved_regs; | |
1275 | } | |
1276 | ||
1277 | void | |
1278 | deprecated_set_frame_extra_info_hack (struct frame_info *frame, | |
1279 | struct frame_extra_info *extra_info) | |
1280 | { | |
1281 | frame->extra_info = extra_info; | |
1282 | } | |
1283 | ||
483d36b2 AC |
1284 | void |
1285 | deprecated_set_frame_next_hack (struct frame_info *fi, | |
1286 | struct frame_info *next) | |
1287 | { | |
1288 | fi->next = next; | |
1289 | } | |
1290 | ||
1291 | void | |
1292 | deprecated_set_frame_prev_hack (struct frame_info *fi, | |
1293 | struct frame_info *prev) | |
1294 | { | |
1295 | fi->prev = prev; | |
1296 | } | |
1297 | ||
2d75187b AC |
1298 | struct context * |
1299 | deprecated_get_frame_context (struct frame_info *fi) | |
1300 | { | |
1301 | return fi->context; | |
1302 | } | |
1303 | ||
1304 | void | |
1305 | deprecated_set_frame_context (struct frame_info *fi, | |
1306 | struct context *context) | |
1307 | { | |
1308 | fi->context = context; | |
1309 | } | |
1310 | ||
c8b8a898 AC |
1311 | struct frame_info * |
1312 | deprecated_frame_xmalloc (void) | |
1313 | { | |
1314 | struct frame_info *frame = XMALLOC (struct frame_info); | |
1315 | memset (frame, 0, sizeof (struct frame_info)); | |
1316 | return frame; | |
1317 | } | |
1318 | ||
f6c609c4 AC |
1319 | struct frame_info * |
1320 | deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs, | |
1321 | long sizeof_extra_info) | |
1322 | { | |
1323 | struct frame_info *frame = deprecated_frame_xmalloc (); | |
1324 | make_cleanup (xfree, frame); | |
1325 | if (sizeof_saved_regs > 0) | |
1326 | { | |
1327 | frame->saved_regs = xcalloc (1, sizeof_saved_regs); | |
1328 | make_cleanup (xfree, frame->saved_regs); | |
1329 | } | |
1330 | if (sizeof_extra_info > 0) | |
1331 | { | |
1332 | frame->extra_info = xcalloc (1, sizeof_extra_info); | |
1333 | make_cleanup (xfree, frame->extra_info); | |
1334 | } | |
1335 | return frame; | |
1336 | } | |
c8b8a898 | 1337 | |
4c1e7e9d AC |
1338 | void |
1339 | _initialize_frame (void) | |
1340 | { | |
1341 | obstack_init (&frame_cache_obstack); | |
1342 | } |