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" |
d65fe839 | 37 | |
7a424e99 | 38 | /* Return a frame uniq ID that can be used to, later, re-find the |
101dcfbe AC |
39 | frame. */ |
40 | ||
7a424e99 AC |
41 | struct frame_id |
42 | get_frame_id (struct frame_info *fi) | |
101dcfbe AC |
43 | { |
44 | if (fi == NULL) | |
45 | { | |
7a424e99 | 46 | return null_frame_id; |
101dcfbe AC |
47 | } |
48 | else | |
49 | { | |
7a424e99 AC |
50 | struct frame_id id; |
51 | id.base = fi->frame; | |
52 | id.pc = fi->pc; | |
53 | return id; | |
101dcfbe AC |
54 | } |
55 | } | |
56 | ||
7a424e99 AC |
57 | const struct frame_id null_frame_id; /* All zeros. */ |
58 | ||
59 | struct frame_id | |
60 | frame_id_build (CORE_ADDR base, CORE_ADDR func_or_pc) | |
61 | { | |
62 | struct frame_id id; | |
63 | id.base = base; | |
64 | id.pc = func_or_pc; | |
65 | return id; | |
66 | } | |
67 | ||
68 | int | |
69 | frame_id_p (struct frame_id l) | |
70 | { | |
71 | /* The .func can be NULL but the .base cannot. */ | |
72 | return (l.base != 0); | |
73 | } | |
74 | ||
75 | int | |
76 | frame_id_eq (struct frame_id l, struct frame_id r) | |
77 | { | |
78 | /* If .base is different, the frames are different. */ | |
79 | if (l.base != r.base) | |
80 | return 0; | |
81 | /* Add a test to check that the frame ID's are for the same function | |
82 | here. */ | |
83 | return 1; | |
84 | } | |
85 | ||
86 | int | |
87 | frame_id_inner (struct frame_id l, struct frame_id r) | |
88 | { | |
89 | /* Only return non-zero when strictly inner than. Note that, per | |
90 | comment in "frame.h", there is some fuzz here. Frameless | |
91 | functions are not strictly inner than (same .base but different | |
92 | .func). */ | |
93 | return INNER_THAN (l.base, r.base); | |
94 | } | |
95 | ||
101dcfbe AC |
96 | struct frame_info * |
97 | frame_find_by_id (struct frame_id id) | |
98 | { | |
99 | struct frame_info *frame; | |
100 | ||
101 | /* ZERO denotes the null frame, let the caller decide what to do | |
102 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 103 | if (!frame_id_p (id)) |
101dcfbe AC |
104 | return NULL; |
105 | ||
106 | for (frame = get_current_frame (); | |
107 | frame != NULL; | |
108 | frame = get_prev_frame (frame)) | |
109 | { | |
7a424e99 AC |
110 | struct frame_id this = get_frame_id (frame); |
111 | if (frame_id_eq (id, this)) | |
112 | /* An exact match. */ | |
113 | return frame; | |
114 | if (frame_id_inner (id, this)) | |
115 | /* Gone to far. */ | |
101dcfbe | 116 | return NULL; |
7a424e99 AC |
117 | /* Either, we're not yet gone far enough out along the frame |
118 | chain (inner(this,id), or we're comparing frameless functions | |
119 | (same .base, different .func, no test available). Struggle | |
120 | on until we've definitly gone to far. */ | |
101dcfbe AC |
121 | } |
122 | return NULL; | |
123 | } | |
124 | ||
f18c5a73 AC |
125 | CORE_ADDR |
126 | frame_pc_unwind (struct frame_info *frame) | |
127 | { | |
128 | if (!frame->pc_unwind_cache_p) | |
129 | { | |
130 | frame->pc_unwind_cache = frame->pc_unwind (frame, &frame->unwind_cache); | |
131 | frame->pc_unwind_cache_p = 1; | |
132 | } | |
133 | return frame->pc_unwind_cache; | |
134 | } | |
135 | ||
c689142b AC |
136 | struct frame_id |
137 | frame_id_unwind (struct frame_info *frame) | |
138 | { | |
139 | if (!frame->id_unwind_cache_p) | |
140 | { | |
141 | frame->id_unwind_cache = | |
142 | frame->id_unwind (frame, &frame->unwind_cache); | |
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. */ | |
f18c5a73 | 189 | frame->register_unwind (frame, &frame->unwind_cache, regnum, |
4f460812 AC |
190 | optimizedp, lvalp, addrp, realnump, bufferp); |
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 | ||
c689142b AC |
658 | static struct frame_id |
659 | frame_saved_regs_id_unwind (struct frame_info *next_frame, void **cache) | |
660 | { | |
661 | int fromleaf; | |
662 | struct frame_id id; | |
663 | ||
664 | if (next_frame->next == NULL) | |
665 | /* FIXME: 2002-11-09: Frameless functions can occure anywhere in | |
666 | the frame chain, not just the inner most frame! The generic, | |
667 | per-architecture, frame code should handle this and the below | |
668 | should simply be removed. */ | |
669 | fromleaf = FRAMELESS_FUNCTION_INVOCATION (next_frame); | |
670 | else | |
671 | fromleaf = 0; | |
672 | ||
673 | if (fromleaf) | |
674 | /* A frameless inner-most frame. The `FP' (which isn't an | |
675 | architecture frame-pointer register!) of the caller is the same | |
676 | as the callee. */ | |
677 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
678 | edge condition. Instead the per-architecture code should hande | |
679 | it locally. */ | |
680 | id.base = get_frame_base (next_frame); | |
681 | else | |
682 | { | |
683 | /* Two macros defined in tm.h specify the machine-dependent | |
684 | actions to be performed here. | |
685 | ||
686 | First, get the frame's chain-pointer. | |
687 | ||
688 | If that is zero, the frame is the outermost frame or a leaf | |
689 | called by the outermost frame. This means that if start | |
690 | calls main without a frame, we'll return 0 (which is fine | |
691 | anyway). | |
692 | ||
693 | Nope; there's a problem. This also returns when the current | |
694 | routine is a leaf of main. This is unacceptable. We move | |
695 | this to after the ffi test; I'd rather have backtraces from | |
696 | start go curfluy than have an abort called from main not show | |
697 | main. */ | |
698 | id.base = FRAME_CHAIN (next_frame); | |
699 | ||
51603483 | 700 | if (!frame_chain_valid (id.base, next_frame)) |
c689142b AC |
701 | return null_frame_id; |
702 | } | |
703 | if (id.base == 0) | |
704 | return null_frame_id; | |
705 | ||
706 | /* FIXME: cagney/2002-06-08: This should probably return the frame's | |
707 | function and not the PC (a.k.a. resume address). */ | |
708 | id.pc = frame_pc_unwind (next_frame); | |
709 | return id; | |
710 | } | |
711 | ||
4c1e7e9d AC |
712 | /* Function: get_saved_register |
713 | Find register number REGNUM relative to FRAME and put its (raw, | |
714 | target format) contents in *RAW_BUFFER. | |
715 | ||
716 | Set *OPTIMIZED if the variable was optimized out (and thus can't be | |
717 | fetched). Note that this is never set to anything other than zero | |
718 | in this implementation. | |
719 | ||
720 | Set *LVAL to lval_memory, lval_register, or not_lval, depending on | |
721 | whether the value was fetched from memory, from a register, or in a | |
722 | strange and non-modifiable way (e.g. a frame pointer which was | |
723 | calculated rather than fetched). We will use not_lval for values | |
724 | fetched from generic dummy frames. | |
725 | ||
726 | Set *ADDRP to the address, either in memory or as a REGISTER_BYTE | |
727 | offset into the registers array. If the value is stored in a dummy | |
728 | frame, set *ADDRP to zero. | |
729 | ||
730 | To use this implementation, define a function called | |
731 | "get_saved_register" in your target code, which simply passes all | |
732 | of its arguments to this function. | |
733 | ||
734 | The argument RAW_BUFFER must point to aligned memory. */ | |
735 | ||
736 | void | |
737 | deprecated_generic_get_saved_register (char *raw_buffer, int *optimized, | |
738 | CORE_ADDR *addrp, | |
739 | struct frame_info *frame, int regnum, | |
740 | enum lval_type *lval) | |
741 | { | |
742 | if (!target_has_registers) | |
743 | error ("No registers."); | |
744 | ||
8f871025 AC |
745 | gdb_assert (FRAME_INIT_SAVED_REGS_P ()); |
746 | ||
4c1e7e9d AC |
747 | /* Normal systems don't optimize out things with register numbers. */ |
748 | if (optimized != NULL) | |
749 | *optimized = 0; | |
750 | ||
751 | if (addrp) /* default assumption: not found in memory */ | |
752 | *addrp = 0; | |
753 | ||
754 | /* Note: since the current frame's registers could only have been | |
755 | saved by frames INTERIOR TO the current frame, we skip examining | |
756 | the current frame itself: otherwise, we would be getting the | |
757 | previous frame's registers which were saved by the current frame. */ | |
758 | ||
759 | while (frame && ((frame = frame->next) != NULL)) | |
760 | { | |
5e0f933e | 761 | if (get_frame_type (frame) == DUMMY_FRAME) |
4c1e7e9d AC |
762 | { |
763 | if (lval) /* found it in a CALL_DUMMY frame */ | |
764 | *lval = not_lval; | |
765 | if (raw_buffer) | |
766 | /* FIXME: cagney/2002-06-26: This should be via the | |
767 | gdbarch_register_read() method so that it, on the fly, | |
768 | constructs either a raw or pseudo register from the raw | |
769 | register cache. */ | |
770 | regcache_raw_read (generic_find_dummy_frame (frame->pc, | |
771 | frame->frame), | |
772 | regnum, raw_buffer); | |
773 | return; | |
774 | } | |
775 | ||
776 | FRAME_INIT_SAVED_REGS (frame); | |
777 | if (frame->saved_regs != NULL | |
778 | && frame->saved_regs[regnum] != 0) | |
779 | { | |
780 | if (lval) /* found it saved on the stack */ | |
781 | *lval = lval_memory; | |
782 | if (regnum == SP_REGNUM) | |
783 | { | |
784 | if (raw_buffer) /* SP register treated specially */ | |
785 | store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), | |
786 | frame->saved_regs[regnum]); | |
787 | } | |
788 | else | |
789 | { | |
790 | if (addrp) /* any other register */ | |
791 | *addrp = frame->saved_regs[regnum]; | |
792 | if (raw_buffer) | |
793 | read_memory (frame->saved_regs[regnum], raw_buffer, | |
794 | REGISTER_RAW_SIZE (regnum)); | |
795 | } | |
796 | return; | |
797 | } | |
798 | } | |
799 | ||
800 | /* If we get thru the loop to this point, it means the register was | |
801 | not saved in any frame. Return the actual live-register value. */ | |
802 | ||
803 | if (lval) /* found it in a live register */ | |
804 | *lval = lval_register; | |
805 | if (addrp) | |
806 | *addrp = REGISTER_BYTE (regnum); | |
807 | if (raw_buffer) | |
808 | deprecated_read_register_gen (regnum, raw_buffer); | |
809 | } | |
810 | ||
811 | /* Using the PC, select a mechanism for unwinding a frame returning | |
812 | the previous frame. The register unwind function should, on | |
813 | demand, initialize the ->context object. */ | |
814 | ||
815 | static void | |
816 | set_unwind_by_pc (CORE_ADDR pc, CORE_ADDR fp, | |
f18c5a73 | 817 | frame_register_unwind_ftype **unwind_register, |
c689142b AC |
818 | frame_pc_unwind_ftype **unwind_pc, |
819 | frame_id_unwind_ftype **unwind_id) | |
4c1e7e9d | 820 | { |
07555a72 | 821 | if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES) |
f18c5a73 AC |
822 | { |
823 | /* Still need to set this to something. The ``info frame'' code | |
824 | calls this function to find out where the saved registers are. | |
825 | Hopefully this is robust enough to stop any core dumps and | |
826 | return vaguely correct values.. */ | |
827 | *unwind_register = frame_saved_regs_register_unwind; | |
828 | *unwind_pc = frame_saved_regs_pc_unwind; | |
c689142b | 829 | *unwind_id = frame_saved_regs_id_unwind; |
f18c5a73 | 830 | } |
ae45cd16 AC |
831 | else if (DEPRECATED_PC_IN_CALL_DUMMY_P () |
832 | ? DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0) | |
833 | : pc_in_dummy_frame (pc)) | |
f18c5a73 AC |
834 | { |
835 | *unwind_register = dummy_frame_register_unwind; | |
836 | *unwind_pc = dummy_frame_pc_unwind; | |
c689142b | 837 | *unwind_id = dummy_frame_id_unwind; |
f18c5a73 | 838 | } |
4c1e7e9d | 839 | else |
f18c5a73 AC |
840 | { |
841 | *unwind_register = frame_saved_regs_register_unwind; | |
842 | *unwind_pc = frame_saved_regs_pc_unwind; | |
c689142b | 843 | *unwind_id = frame_saved_regs_id_unwind; |
f18c5a73 | 844 | } |
4c1e7e9d AC |
845 | } |
846 | ||
847 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. | |
848 | Always returns a non-NULL value. */ | |
849 | ||
850 | struct frame_info * | |
851 | create_new_frame (CORE_ADDR addr, CORE_ADDR pc) | |
852 | { | |
853 | struct frame_info *fi; | |
5a203e44 | 854 | enum frame_type type; |
4c1e7e9d | 855 | |
479ab5a0 | 856 | fi = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d AC |
857 | |
858 | fi->frame = addr; | |
859 | fi->pc = pc; | |
5a203e44 AC |
860 | /* NOTE: cagney/2002-11-18: The code segments, found in |
861 | create_new_frame and get_prev_frame(), that initializes the | |
862 | frames type is subtly different. The latter only updates ->type | |
863 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops | |
864 | get_prev_frame() overriding the frame's type when the INIT code | |
865 | has previously set it. This is really somewhat bogus. The | |
866 | initialization, as seen in create_new_frame(), should occur | |
867 | before the INIT function has been called. */ | |
ae45cd16 AC |
868 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
869 | && (DEPRECATED_PC_IN_CALL_DUMMY_P () | |
870 | ? DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0) | |
871 | : pc_in_dummy_frame (pc))) | |
5a203e44 AC |
872 | /* NOTE: cagney/2002-11-11: Does this even occure? */ |
873 | type = DUMMY_FRAME; | |
874 | else | |
875 | { | |
876 | char *name; | |
877 | find_pc_partial_function (pc, &name, NULL, NULL); | |
878 | if (PC_IN_SIGTRAMP (fi->pc, name)) | |
879 | type = SIGTRAMP_FRAME; | |
880 | else | |
881 | type = NORMAL_FRAME; | |
882 | } | |
883 | fi->type = type; | |
4c1e7e9d AC |
884 | |
885 | if (INIT_EXTRA_FRAME_INFO_P ()) | |
886 | INIT_EXTRA_FRAME_INFO (0, fi); | |
887 | ||
888 | /* Select/initialize an unwind function. */ | |
f18c5a73 | 889 | set_unwind_by_pc (fi->pc, fi->frame, &fi->register_unwind, |
c689142b | 890 | &fi->pc_unwind, &fi->id_unwind); |
4c1e7e9d AC |
891 | |
892 | return fi; | |
893 | } | |
894 | ||
895 | /* Return the frame that FRAME calls (NULL if FRAME is the innermost | |
896 | frame). */ | |
897 | ||
898 | struct frame_info * | |
899 | get_next_frame (struct frame_info *frame) | |
900 | { | |
901 | return frame->next; | |
902 | } | |
903 | ||
904 | /* Flush the entire frame cache. */ | |
905 | ||
906 | void | |
907 | flush_cached_frames (void) | |
908 | { | |
909 | /* Since we can't really be sure what the first object allocated was */ | |
910 | obstack_free (&frame_cache_obstack, 0); | |
911 | obstack_init (&frame_cache_obstack); | |
912 | ||
913 | current_frame = NULL; /* Invalidate cache */ | |
914 | select_frame (NULL); | |
915 | annotate_frames_invalid (); | |
916 | } | |
917 | ||
918 | /* Flush the frame cache, and start a new one if necessary. */ | |
919 | ||
920 | void | |
921 | reinit_frame_cache (void) | |
922 | { | |
923 | flush_cached_frames (); | |
924 | ||
925 | /* FIXME: The inferior_ptid test is wrong if there is a corefile. */ | |
926 | if (PIDGET (inferior_ptid) != 0) | |
927 | { | |
928 | select_frame (get_current_frame ()); | |
929 | } | |
930 | } | |
931 | ||
932 | /* Return a structure containing various interesting information | |
933 | about the frame that called NEXT_FRAME. Returns NULL | |
934 | if there is no such frame. */ | |
935 | ||
936 | struct frame_info * | |
937 | get_prev_frame (struct frame_info *next_frame) | |
938 | { | |
939 | CORE_ADDR address = 0; | |
940 | struct frame_info *prev; | |
95adb866 | 941 | int fromleaf; |
4c1e7e9d | 942 | |
95adb866 AC |
943 | /* Return the inner-most frame, when the caller passes in NULL. */ |
944 | /* NOTE: cagney/2002-11-09: Not sure how this would happen. The | |
945 | caller should have previously obtained a valid frame using | |
946 | get_selected_frame() and then called this code - only possibility | |
947 | I can think of is code behaving badly. */ | |
948 | if (next_frame == NULL) | |
4c1e7e9d | 949 | { |
95adb866 AC |
950 | /* NOTE: cagney/2002-11-09: There was a code segment here that |
951 | would error out when CURRENT_FRAME was NULL. The comment | |
952 | that went with it made the claim ... | |
953 | ||
954 | ``This screws value_of_variable, which just wants a nice | |
955 | clean NULL return from block_innermost_frame if there are no | |
956 | frames. I don't think I've ever seen this message happen | |
957 | otherwise. And returning NULL here is a perfectly legitimate | |
958 | thing to do.'' | |
959 | ||
960 | Per the above, this code shouldn't even be called with a NULL | |
961 | NEXT_FRAME. */ | |
4c1e7e9d AC |
962 | return current_frame; |
963 | } | |
964 | ||
15220c65 AC |
965 | /* Only try to do the unwind once. */ |
966 | if (next_frame->prev_p) | |
4c1e7e9d | 967 | return next_frame->prev; |
15220c65 | 968 | next_frame->prev_p = 1; |
4c1e7e9d AC |
969 | |
970 | /* On some machines it is possible to call a function without | |
971 | setting up a stack frame for it. On these machines, we | |
972 | define this macro to take two args; a frameinfo pointer | |
973 | identifying a frame and a variable to set or clear if it is | |
974 | or isn't leafless. */ | |
975 | ||
976 | /* Still don't want to worry about this except on the innermost | |
95adb866 AC |
977 | frame. This macro will set FROMLEAF if NEXT_FRAME is a frameless |
978 | function invocation. */ | |
979 | if (next_frame->next == NULL) | |
980 | /* FIXME: 2002-11-09: Frameless functions can occure anywhere in | |
981 | the frame chain, not just the inner most frame! The generic, | |
982 | per-architecture, frame code should handle this and the below | |
983 | should simply be removed. */ | |
984 | fromleaf = FRAMELESS_FUNCTION_INVOCATION (next_frame); | |
985 | else | |
986 | fromleaf = 0; | |
987 | ||
988 | if (fromleaf) | |
989 | /* A frameless inner-most frame. The `FP' (which isn't an | |
990 | architecture frame-pointer register!) of the caller is the same | |
991 | as the callee. */ | |
992 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
993 | edge condition. Instead the per-architecture code should hande | |
994 | it locally. */ | |
c193f6ac | 995 | address = get_frame_base (next_frame); |
95adb866 | 996 | else |
4c1e7e9d AC |
997 | { |
998 | /* Two macros defined in tm.h specify the machine-dependent | |
999 | actions to be performed here. | |
95adb866 | 1000 | |
4c1e7e9d | 1001 | First, get the frame's chain-pointer. |
95adb866 | 1002 | |
4c1e7e9d AC |
1003 | If that is zero, the frame is the outermost frame or a leaf |
1004 | called by the outermost frame. This means that if start | |
1005 | calls main without a frame, we'll return 0 (which is fine | |
1006 | anyway). | |
1007 | ||
1008 | Nope; there's a problem. This also returns when the current | |
1009 | routine is a leaf of main. This is unacceptable. We move | |
1010 | this to after the ffi test; I'd rather have backtraces from | |
1011 | start go curfluy than have an abort called from main not show | |
1012 | main. */ | |
1013 | address = FRAME_CHAIN (next_frame); | |
1014 | ||
51603483 | 1015 | if (!frame_chain_valid (address, next_frame)) |
4c1e7e9d AC |
1016 | return 0; |
1017 | } | |
1018 | if (address == 0) | |
1019 | return 0; | |
1020 | ||
95adb866 | 1021 | /* Create an initially zero previous frame. */ |
479ab5a0 | 1022 | prev = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d | 1023 | |
95adb866 AC |
1024 | /* Link it in. */ |
1025 | next_frame->prev = prev; | |
4c1e7e9d AC |
1026 | prev->next = next_frame; |
1027 | prev->frame = address; | |
1028 | prev->level = next_frame->level + 1; | |
5a203e44 AC |
1029 | /* FIXME: cagney/2002-11-18: Should be setting the frame's type |
1030 | here, before anything else, and not last. Various INIT functions | |
1031 | are full of work-arounds for the frames type not being set | |
1032 | correctly from the word go. Ulgh! */ | |
1033 | prev->type = NORMAL_FRAME; | |
4c1e7e9d | 1034 | |
95adb866 | 1035 | /* This change should not be needed, FIXME! We should determine |
a5afb99f AC |
1036 | whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen |
1037 | after INIT_EXTRA_FRAME_INFO and come up with a simple way to | |
1038 | express what goes on here. | |
95adb866 AC |
1039 | |
1040 | INIT_EXTRA_FRAME_INFO is called from two places: create_new_frame | |
1041 | (where the PC is already set up) and here (where it isn't). | |
a5afb99f | 1042 | DEPRECATED_INIT_FRAME_PC is only called from here, always after |
95adb866 AC |
1043 | INIT_EXTRA_FRAME_INFO. |
1044 | ||
1045 | The catch is the MIPS, where INIT_EXTRA_FRAME_INFO requires the | |
1046 | PC value (which hasn't been set yet). Some other machines appear | |
1047 | to require INIT_EXTRA_FRAME_INFO before they can do | |
a5afb99f | 1048 | DEPRECATED_INIT_FRAME_PC. Phoo. |
95adb866 | 1049 | |
2ca6c561 AC |
1050 | We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more |
1051 | complication to an already overcomplicated part of GDB. | |
1052 | gnu@cygnus.com, 15Sep92. | |
95adb866 | 1053 | |
a5afb99f | 1054 | Assuming that some machines need DEPRECATED_INIT_FRAME_PC after |
95adb866 AC |
1055 | INIT_EXTRA_FRAME_INFO, one possible scheme: |
1056 | ||
1057 | SETUP_INNERMOST_FRAME(): Default version is just create_new_frame | |
1058 | (read_fp ()), read_pc ()). Machines with extra frame info would | |
1059 | do that (or the local equivalent) and then set the extra fields. | |
1060 | ||
1061 | SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that | |
1062 | create_new_frame would no longer init extra frame info; | |
1063 | SETUP_ARBITRARY_FRAME would have to do that. | |
1064 | ||
1065 | INIT_PREV_FRAME(fromleaf, prev) Replace INIT_EXTRA_FRAME_INFO and | |
a5afb99f AC |
1066 | DEPRECATED_INIT_FRAME_PC. This should also return a flag saying |
1067 | whether to keep the new frame, or whether to discard it, because | |
1068 | on some machines (e.g. mips) it is really awkward to have | |
95adb866 AC |
1069 | FRAME_CHAIN_VALID called *before* INIT_EXTRA_FRAME_INFO (there is |
1070 | no good way to get information deduced in FRAME_CHAIN_VALID into | |
1071 | the extra fields of the new frame). std_frame_pc(fromleaf, prev) | |
1072 | ||
1073 | This is the default setting for INIT_PREV_FRAME. It just does | |
a5afb99f AC |
1074 | what the default DEPRECATED_INIT_FRAME_PC does. Some machines |
1075 | will call it from INIT_PREV_FRAME (either at the beginning, the | |
1076 | end, or in the middle). Some machines won't use it. | |
95adb866 AC |
1077 | |
1078 | kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */ | |
1079 | ||
1080 | /* NOTE: cagney/2002-11-09: Just ignore the above! There is no | |
1081 | reason for things to be this complicated. | |
1082 | ||
1083 | The trick is to assume that there is always a frame. Instead of | |
1084 | special casing the inner-most frame, create fake frame | |
1085 | (containing the hardware registers) that is inner to the | |
1086 | user-visible inner-most frame (...) and then unwind from that. | |
1087 | That way architecture code can use use the standard | |
1088 | frame_XX_unwind() functions and not differentiate between the | |
1089 | inner most and any other case. | |
1090 | ||
1091 | Since there is always a frame to unwind from, there is always | |
1092 | somewhere (NEXT_FRAME) to store all the info needed to construct | |
1093 | a new (previous) frame without having to first create it. This | |
1094 | means that the convolution below - needing to carefully order a | |
1095 | frame's initialization - isn't needed. | |
1096 | ||
1097 | The irony here though, is that FRAME_CHAIN(), at least for a more | |
1098 | up-to-date architecture, always calls FRAME_SAVED_PC(), and | |
1099 | FRAME_SAVED_PC() computes the PC but without first needing the | |
1100 | frame! Instead of the convolution below, we could have simply | |
1101 | called FRAME_SAVED_PC() and been done with it! Note that | |
1102 | FRAME_SAVED_PC() is being superseed by frame_pc_unwind() and that | |
1103 | function does have somewhere to cache that PC value. */ | |
4c1e7e9d | 1104 | |
2ca6c561 | 1105 | if (DEPRECATED_INIT_FRAME_PC_FIRST_P ()) |
97f46953 | 1106 | prev->pc = (DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf, prev)); |
4c1e7e9d AC |
1107 | |
1108 | if (INIT_EXTRA_FRAME_INFO_P ()) | |
1109 | INIT_EXTRA_FRAME_INFO (fromleaf, prev); | |
1110 | ||
1111 | /* This entry is in the frame queue now, which is good since | |
95adb866 AC |
1112 | FRAME_SAVED_PC may use that queue to figure out its value (see |
1113 | tm-sparc.h). We want the pc saved in the inferior frame. */ | |
a5afb99f AC |
1114 | if (DEPRECATED_INIT_FRAME_PC_P ()) |
1115 | prev->pc = DEPRECATED_INIT_FRAME_PC (fromleaf, prev); | |
4c1e7e9d | 1116 | |
95adb866 AC |
1117 | /* If ->frame and ->pc are unchanged, we are in the process of |
1118 | getting ourselves into an infinite backtrace. Some architectures | |
1119 | check this in FRAME_CHAIN or thereabouts, but it seems like there | |
1120 | is no reason this can't be an architecture-independent check. */ | |
1121 | if (prev->frame == next_frame->frame | |
1122 | && prev->pc == next_frame->pc) | |
4c1e7e9d | 1123 | { |
95adb866 AC |
1124 | next_frame->prev = NULL; |
1125 | obstack_free (&frame_cache_obstack, prev); | |
1126 | return NULL; | |
4c1e7e9d AC |
1127 | } |
1128 | ||
1129 | /* Initialize the code used to unwind the frame PREV based on the PC | |
1130 | (and probably other architectural information). The PC lets you | |
1131 | check things like the debug info at that point (dwarf2cfi?) and | |
1132 | use that to decide how the frame should be unwound. */ | |
f18c5a73 | 1133 | set_unwind_by_pc (prev->pc, prev->frame, &prev->register_unwind, |
c689142b | 1134 | &prev->pc_unwind, &prev->id_unwind); |
4c1e7e9d | 1135 | |
5a203e44 AC |
1136 | /* NOTE: cagney/2002-11-18: The code segments, found in |
1137 | create_new_frame and get_prev_frame(), that initializes the | |
1138 | frames type is subtly different. The latter only updates ->type | |
1139 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops | |
1140 | get_prev_frame() overriding the frame's type when the INIT code | |
1141 | has previously set it. This is really somewhat bogus. The | |
1142 | initialization, as seen in create_new_frame(), should occur | |
1143 | before the INIT function has been called. */ | |
07555a72 | 1144 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
ae45cd16 AC |
1145 | && (DEPRECATED_PC_IN_CALL_DUMMY_P () |
1146 | ? DEPRECATED_PC_IN_CALL_DUMMY (prev->pc, 0, 0) | |
1147 | : pc_in_dummy_frame (prev->pc))) | |
5a203e44 AC |
1148 | prev->type = DUMMY_FRAME; |
1149 | else | |
1150 | { | |
1151 | /* FIXME: cagney/2002-11-10: This should be moved to before the | |
1152 | INIT code above so that the INIT code knows what the frame's | |
1153 | type is (in fact, for a [generic] dummy-frame, the type can | |
1154 | be set and then the entire initialization can be skipped. | |
1155 | Unforunatly, its the INIT code that sets the PC (Hmm, catch | |
1156 | 22). */ | |
1157 | char *name; | |
1158 | find_pc_partial_function (prev->pc, &name, NULL, NULL); | |
1159 | if (PC_IN_SIGTRAMP (prev->pc, name)) | |
1160 | prev->type = SIGTRAMP_FRAME; | |
1161 | /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some | |
1162 | architectures are forcing the frame's type in INIT so we | |
1163 | don't want to override it here. Remember, NORMAL_FRAME == 0, | |
1164 | so it all works (just :-/). Once this initialization is | |
1165 | moved to the start of this function, all this nastness will | |
1166 | go away. */ | |
1167 | } | |
4c1e7e9d AC |
1168 | |
1169 | return prev; | |
1170 | } | |
1171 | ||
1172 | CORE_ADDR | |
1173 | get_frame_pc (struct frame_info *frame) | |
1174 | { | |
1175 | return frame->pc; | |
1176 | } | |
1177 | ||
1058bca7 AC |
1178 | static int |
1179 | pc_notcurrent (struct frame_info *frame) | |
1180 | { | |
1181 | /* If FRAME is not the innermost frame, that normally means that | |
1182 | FRAME->pc points at the return instruction (which is *after* the | |
1183 | call instruction), and we want to get the line containing the | |
1184 | call (because the call is where the user thinks the program is). | |
1185 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
1186 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
1187 | PC and such a PC indicates the current (rather than next) | |
1188 | instruction/line, consequently, for such cases, want to get the | |
1189 | line containing fi->pc. */ | |
1190 | struct frame_info *next = get_next_frame (frame); | |
1191 | int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME); | |
1192 | return notcurrent; | |
1193 | } | |
1194 | ||
1195 | void | |
1196 | find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal) | |
1197 | { | |
1198 | (*sal) = find_pc_line (frame->pc, pc_notcurrent (frame)); | |
1199 | } | |
1200 | ||
c193f6ac AC |
1201 | /* Per "frame.h", return the ``address'' of the frame. Code should |
1202 | really be using get_frame_id(). */ | |
1203 | CORE_ADDR | |
1204 | get_frame_base (struct frame_info *fi) | |
1205 | { | |
1206 | return fi->frame; | |
1207 | } | |
1208 | ||
85cf597a AC |
1209 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
1210 | or -1 for a NULL frame. */ | |
1211 | ||
1212 | int | |
1213 | frame_relative_level (struct frame_info *fi) | |
1214 | { | |
1215 | if (fi == NULL) | |
1216 | return -1; | |
1217 | else | |
1218 | return fi->level; | |
1219 | } | |
1220 | ||
5a203e44 AC |
1221 | enum frame_type |
1222 | get_frame_type (struct frame_info *frame) | |
1223 | { | |
1224 | /* Some targets still don't use [generic] dummy frames. Catch them | |
1225 | here. */ | |
07555a72 | 1226 | if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
5a203e44 AC |
1227 | && deprecated_frame_in_dummy (frame)) |
1228 | return DUMMY_FRAME; | |
1229 | return frame->type; | |
1230 | } | |
1231 | ||
1232 | void | |
1233 | deprecated_set_frame_type (struct frame_info *frame, enum frame_type type) | |
1234 | { | |
1235 | /* Arrrg! See comment in "frame.h". */ | |
1236 | frame->type = type; | |
1237 | } | |
1238 | ||
4c1e7e9d AC |
1239 | #ifdef FRAME_FIND_SAVED_REGS |
1240 | /* XXX - deprecated. This is a compatibility function for targets | |
1241 | that do not yet implement FRAME_INIT_SAVED_REGS. */ | |
1242 | /* Find the addresses in which registers are saved in FRAME. */ | |
1243 | ||
1244 | void | |
95486978 AC |
1245 | deprecated_get_frame_saved_regs (struct frame_info *frame, |
1246 | struct frame_saved_regs *saved_regs_addr) | |
4c1e7e9d AC |
1247 | { |
1248 | if (frame->saved_regs == NULL) | |
1249 | { | |
1250 | frame->saved_regs = (CORE_ADDR *) | |
479ab5a0 | 1251 | frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); |
4c1e7e9d AC |
1252 | } |
1253 | if (saved_regs_addr == NULL) | |
1254 | { | |
1255 | struct frame_saved_regs saved_regs; | |
1256 | FRAME_FIND_SAVED_REGS (frame, saved_regs); | |
1257 | memcpy (frame->saved_regs, &saved_regs, SIZEOF_FRAME_SAVED_REGS); | |
1258 | } | |
1259 | else | |
1260 | { | |
1261 | FRAME_FIND_SAVED_REGS (frame, *saved_regs_addr); | |
1262 | memcpy (frame->saved_regs, saved_regs_addr, SIZEOF_FRAME_SAVED_REGS); | |
1263 | } | |
1264 | } | |
1265 | #endif | |
1266 | ||
0394eb2a AC |
1267 | struct frame_extra_info * |
1268 | get_frame_extra_info (struct frame_info *fi) | |
1269 | { | |
1270 | return fi->extra_info; | |
1271 | } | |
1272 | ||
2c517d0e AC |
1273 | struct frame_extra_info * |
1274 | frame_extra_info_zalloc (struct frame_info *fi, long size) | |
1275 | { | |
479ab5a0 | 1276 | fi->extra_info = frame_obstack_zalloc (size); |
2c517d0e AC |
1277 | return fi->extra_info; |
1278 | } | |
1279 | ||
b87efeee | 1280 | void |
2f107107 | 1281 | deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc) |
b87efeee | 1282 | { |
2f107107 AC |
1283 | /* See comment in "frame.h". */ |
1284 | frame->pc = pc; | |
1285 | } | |
1286 | ||
1287 | void | |
1288 | deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base) | |
1289 | { | |
1290 | /* See comment in "frame.h". */ | |
1291 | frame->frame = base; | |
b87efeee AC |
1292 | } |
1293 | ||
c8b8a898 AC |
1294 | void |
1295 | deprecated_set_frame_saved_regs_hack (struct frame_info *frame, | |
1296 | CORE_ADDR *saved_regs) | |
1297 | { | |
1298 | frame->saved_regs = saved_regs; | |
1299 | } | |
1300 | ||
1301 | void | |
1302 | deprecated_set_frame_extra_info_hack (struct frame_info *frame, | |
1303 | struct frame_extra_info *extra_info) | |
1304 | { | |
1305 | frame->extra_info = extra_info; | |
1306 | } | |
1307 | ||
483d36b2 AC |
1308 | void |
1309 | deprecated_set_frame_next_hack (struct frame_info *fi, | |
1310 | struct frame_info *next) | |
1311 | { | |
1312 | fi->next = next; | |
1313 | } | |
1314 | ||
1315 | void | |
1316 | deprecated_set_frame_prev_hack (struct frame_info *fi, | |
1317 | struct frame_info *prev) | |
1318 | { | |
1319 | fi->prev = prev; | |
1320 | } | |
1321 | ||
2d75187b AC |
1322 | struct context * |
1323 | deprecated_get_frame_context (struct frame_info *fi) | |
1324 | { | |
1325 | return fi->context; | |
1326 | } | |
1327 | ||
1328 | void | |
1329 | deprecated_set_frame_context (struct frame_info *fi, | |
1330 | struct context *context) | |
1331 | { | |
1332 | fi->context = context; | |
1333 | } | |
1334 | ||
c8b8a898 AC |
1335 | struct frame_info * |
1336 | deprecated_frame_xmalloc (void) | |
1337 | { | |
1338 | struct frame_info *frame = XMALLOC (struct frame_info); | |
1339 | memset (frame, 0, sizeof (struct frame_info)); | |
1340 | return frame; | |
1341 | } | |
1342 | ||
f6c609c4 AC |
1343 | struct frame_info * |
1344 | deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs, | |
1345 | long sizeof_extra_info) | |
1346 | { | |
1347 | struct frame_info *frame = deprecated_frame_xmalloc (); | |
1348 | make_cleanup (xfree, frame); | |
1349 | if (sizeof_saved_regs > 0) | |
1350 | { | |
1351 | frame->saved_regs = xcalloc (1, sizeof_saved_regs); | |
1352 | make_cleanup (xfree, frame->saved_regs); | |
1353 | } | |
1354 | if (sizeof_extra_info > 0) | |
1355 | { | |
1356 | frame->extra_info = xcalloc (1, sizeof_extra_info); | |
1357 | make_cleanup (xfree, frame->extra_info); | |
1358 | } | |
1359 | return frame; | |
1360 | } | |
c8b8a898 | 1361 | |
4c1e7e9d AC |
1362 | void |
1363 | _initialize_frame (void) | |
1364 | { | |
1365 | obstack_init (&frame_cache_obstack); | |
1366 | } |