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Commit | Line | Data |
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4f460812 | 1 | /* Cache and manage frames for GDB, the GNU debugger. |
96cb11df | 2 | |
6aba47ca | 3 | Copyright (C) 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001, |
0fb0cc75 | 4 | 2002, 2003, 2004, 2007, 2008, 2009 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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
d65fe839 AC |
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 | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
d65fe839 AC |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "target.h" | |
24 | #include "value.h" | |
39f77062 | 25 | #include "inferior.h" /* for inferior_ptid */ |
4e052eda | 26 | #include "regcache.h" |
4f460812 | 27 | #include "gdb_assert.h" |
e36180d7 | 28 | #include "gdb_string.h" |
eb8bc282 | 29 | #include "user-regs.h" |
4c1e7e9d AC |
30 | #include "gdb_obstack.h" |
31 | #include "dummy-frame.h" | |
a94dd1fd | 32 | #include "sentinel-frame.h" |
4c1e7e9d AC |
33 | #include "gdbcore.h" |
34 | #include "annotate.h" | |
6e7f8b9c | 35 | #include "language.h" |
494cca16 | 36 | #include "frame-unwind.h" |
da62e633 | 37 | #include "frame-base.h" |
eb4f72c5 AC |
38 | #include "command.h" |
39 | #include "gdbcmd.h" | |
f4c5303c | 40 | #include "observer.h" |
c8cd9f6c | 41 | #include "objfiles.h" |
60250e8b | 42 | #include "exceptions.h" |
8ea051c5 | 43 | #include "gdbthread.h" |
edb3359d DJ |
44 | #include "block.h" |
45 | #include "inline-frame.h" | |
eb4f72c5 | 46 | |
5613d8d3 | 47 | static struct frame_info *get_prev_frame_1 (struct frame_info *this_frame); |
edb3359d | 48 | static struct frame_info *get_prev_frame_raw (struct frame_info *this_frame); |
5613d8d3 | 49 | |
bd013d54 AC |
50 | /* We keep a cache of stack frames, each of which is a "struct |
51 | frame_info". The innermost one gets allocated (in | |
52 | wait_for_inferior) each time the inferior stops; current_frame | |
53 | points to it. Additional frames get allocated (in get_prev_frame) | |
54 | as needed, and are chained through the next and prev fields. Any | |
55 | time that the frame cache becomes invalid (most notably when we | |
56 | execute something, but also if we change how we interpret the | |
57 | frames (e.g. "set heuristic-fence-post" in mips-tdep.c, or anything | |
58 | which reads new symbols)), we should call reinit_frame_cache. */ | |
59 | ||
60 | struct frame_info | |
61 | { | |
62 | /* Level of this frame. The inner-most (youngest) frame is at level | |
63 | 0. As you move towards the outer-most (oldest) frame, the level | |
64 | increases. This is a cached value. It could just as easily be | |
65 | computed by counting back from the selected frame to the inner | |
66 | most frame. */ | |
bbde78fa | 67 | /* NOTE: cagney/2002-04-05: Perhaps a level of ``-1'' should be |
bd013d54 AC |
68 | reserved to indicate a bogus frame - one that has been created |
69 | just to keep GDB happy (GDB always needs a frame). For the | |
70 | moment leave this as speculation. */ | |
71 | int level; | |
72 | ||
bd013d54 AC |
73 | /* The frame's low-level unwinder and corresponding cache. The |
74 | low-level unwinder is responsible for unwinding register values | |
75 | for the previous frame. The low-level unwind methods are | |
bbde78fa | 76 | selected based on the presence, or otherwise, of register unwind |
bd013d54 AC |
77 | information such as CFI. */ |
78 | void *prologue_cache; | |
79 | const struct frame_unwind *unwind; | |
80 | ||
36f15f55 UW |
81 | /* Cached copy of the previous frame's architecture. */ |
82 | struct | |
83 | { | |
84 | int p; | |
85 | struct gdbarch *arch; | |
86 | } prev_arch; | |
87 | ||
bd013d54 AC |
88 | /* Cached copy of the previous frame's resume address. */ |
89 | struct { | |
90 | int p; | |
91 | CORE_ADDR value; | |
92 | } prev_pc; | |
93 | ||
94 | /* Cached copy of the previous frame's function address. */ | |
95 | struct | |
96 | { | |
97 | CORE_ADDR addr; | |
98 | int p; | |
99 | } prev_func; | |
100 | ||
101 | /* This frame's ID. */ | |
102 | struct | |
103 | { | |
104 | int p; | |
105 | struct frame_id value; | |
106 | } this_id; | |
107 | ||
108 | /* The frame's high-level base methods, and corresponding cache. | |
109 | The high level base methods are selected based on the frame's | |
110 | debug info. */ | |
111 | const struct frame_base *base; | |
112 | void *base_cache; | |
113 | ||
114 | /* Pointers to the next (down, inner, younger) and previous (up, | |
115 | outer, older) frame_info's in the frame cache. */ | |
116 | struct frame_info *next; /* down, inner, younger */ | |
117 | int prev_p; | |
118 | struct frame_info *prev; /* up, outer, older */ | |
55feb689 DJ |
119 | |
120 | /* The reason why we could not set PREV, or UNWIND_NO_REASON if we | |
121 | could. Only valid when PREV_P is set. */ | |
122 | enum unwind_stop_reason stop_reason; | |
bd013d54 AC |
123 | }; |
124 | ||
b83e9eb7 JB |
125 | /* A frame stash used to speed up frame lookups. */ |
126 | ||
127 | /* We currently only stash one frame at a time, as this seems to be | |
128 | sufficient for now. */ | |
129 | static struct frame_info *frame_stash = NULL; | |
130 | ||
131 | /* Add the following FRAME to the frame stash. */ | |
132 | ||
133 | static void | |
134 | frame_stash_add (struct frame_info *frame) | |
135 | { | |
136 | frame_stash = frame; | |
137 | } | |
138 | ||
139 | /* Search the frame stash for an entry with the given frame ID. | |
140 | If found, return that frame. Otherwise return NULL. */ | |
141 | ||
142 | static struct frame_info * | |
143 | frame_stash_find (struct frame_id id) | |
144 | { | |
145 | if (frame_stash && frame_id_eq (frame_stash->this_id.value, id)) | |
146 | return frame_stash; | |
147 | ||
148 | return NULL; | |
149 | } | |
150 | ||
151 | /* Invalidate the frame stash by removing all entries in it. */ | |
152 | ||
153 | static void | |
154 | frame_stash_invalidate (void) | |
155 | { | |
156 | frame_stash = NULL; | |
157 | } | |
158 | ||
ac2bd0a9 AC |
159 | /* Flag to control debugging. */ |
160 | ||
669fac23 | 161 | int frame_debug; |
920d2a44 AC |
162 | static void |
163 | show_frame_debug (struct ui_file *file, int from_tty, | |
164 | struct cmd_list_element *c, const char *value) | |
165 | { | |
166 | fprintf_filtered (file, _("Frame debugging is %s.\n"), value); | |
167 | } | |
ac2bd0a9 | 168 | |
25d29d70 AC |
169 | /* Flag to indicate whether backtraces should stop at main et.al. */ |
170 | ||
171 | static int backtrace_past_main; | |
920d2a44 AC |
172 | static void |
173 | show_backtrace_past_main (struct ui_file *file, int from_tty, | |
174 | struct cmd_list_element *c, const char *value) | |
175 | { | |
176 | fprintf_filtered (file, _("\ | |
177 | Whether backtraces should continue past \"main\" is %s.\n"), | |
178 | value); | |
179 | } | |
180 | ||
2315ffec | 181 | static int backtrace_past_entry; |
920d2a44 AC |
182 | static void |
183 | show_backtrace_past_entry (struct ui_file *file, int from_tty, | |
184 | struct cmd_list_element *c, const char *value) | |
185 | { | |
186 | fprintf_filtered (file, _("\ | |
187 | Whether backtraces should continue past the entry point of a program is %s.\n"), | |
188 | value); | |
189 | } | |
190 | ||
4a5e53e8 | 191 | static int backtrace_limit = INT_MAX; |
920d2a44 AC |
192 | static void |
193 | show_backtrace_limit (struct ui_file *file, int from_tty, | |
194 | struct cmd_list_element *c, const char *value) | |
195 | { | |
196 | fprintf_filtered (file, _("\ | |
197 | An upper bound on the number of backtrace levels is %s.\n"), | |
198 | value); | |
199 | } | |
200 | ||
eb4f72c5 | 201 | |
ca73dd9d AC |
202 | static void |
203 | fprint_field (struct ui_file *file, const char *name, int p, CORE_ADDR addr) | |
204 | { | |
205 | if (p) | |
5af949e3 | 206 | fprintf_unfiltered (file, "%s=%s", name, hex_string (addr)); |
ca73dd9d AC |
207 | else |
208 | fprintf_unfiltered (file, "!%s", name); | |
209 | } | |
d65fe839 | 210 | |
00905d52 | 211 | void |
7f78e237 AC |
212 | fprint_frame_id (struct ui_file *file, struct frame_id id) |
213 | { | |
ca73dd9d AC |
214 | fprintf_unfiltered (file, "{"); |
215 | fprint_field (file, "stack", id.stack_addr_p, id.stack_addr); | |
216 | fprintf_unfiltered (file, ","); | |
217 | fprint_field (file, "code", id.code_addr_p, id.code_addr); | |
218 | fprintf_unfiltered (file, ","); | |
219 | fprint_field (file, "special", id.special_addr_p, id.special_addr); | |
edb3359d DJ |
220 | if (id.inline_depth) |
221 | fprintf_unfiltered (file, ",inlined=%d", id.inline_depth); | |
ca73dd9d | 222 | fprintf_unfiltered (file, "}"); |
7f78e237 AC |
223 | } |
224 | ||
225 | static void | |
226 | fprint_frame_type (struct ui_file *file, enum frame_type type) | |
227 | { | |
228 | switch (type) | |
229 | { | |
7f78e237 AC |
230 | case NORMAL_FRAME: |
231 | fprintf_unfiltered (file, "NORMAL_FRAME"); | |
232 | return; | |
233 | case DUMMY_FRAME: | |
234 | fprintf_unfiltered (file, "DUMMY_FRAME"); | |
235 | return; | |
edb3359d DJ |
236 | case INLINE_FRAME: |
237 | fprintf_unfiltered (file, "INLINE_FRAME"); | |
238 | return; | |
239 | case SENTINEL_FRAME: | |
240 | fprintf_unfiltered (file, "SENTINEL_FRAME"); | |
241 | return; | |
7f78e237 AC |
242 | case SIGTRAMP_FRAME: |
243 | fprintf_unfiltered (file, "SIGTRAMP_FRAME"); | |
244 | return; | |
36f15f55 UW |
245 | case ARCH_FRAME: |
246 | fprintf_unfiltered (file, "ARCH_FRAME"); | |
247 | return; | |
7f78e237 AC |
248 | default: |
249 | fprintf_unfiltered (file, "<unknown type>"); | |
250 | return; | |
251 | }; | |
252 | } | |
253 | ||
254 | static void | |
255 | fprint_frame (struct ui_file *file, struct frame_info *fi) | |
256 | { | |
257 | if (fi == NULL) | |
258 | { | |
259 | fprintf_unfiltered (file, "<NULL frame>"); | |
260 | return; | |
261 | } | |
262 | fprintf_unfiltered (file, "{"); | |
263 | fprintf_unfiltered (file, "level=%d", fi->level); | |
264 | fprintf_unfiltered (file, ","); | |
265 | fprintf_unfiltered (file, "type="); | |
c1bf6f65 AC |
266 | if (fi->unwind != NULL) |
267 | fprint_frame_type (file, fi->unwind->type); | |
268 | else | |
269 | fprintf_unfiltered (file, "<unknown>"); | |
7f78e237 AC |
270 | fprintf_unfiltered (file, ","); |
271 | fprintf_unfiltered (file, "unwind="); | |
272 | if (fi->unwind != NULL) | |
273 | gdb_print_host_address (fi->unwind, file); | |
274 | else | |
275 | fprintf_unfiltered (file, "<unknown>"); | |
276 | fprintf_unfiltered (file, ","); | |
277 | fprintf_unfiltered (file, "pc="); | |
278 | if (fi->next != NULL && fi->next->prev_pc.p) | |
5af949e3 | 279 | fprintf_unfiltered (file, "%s", hex_string (fi->next->prev_pc.value)); |
7f78e237 AC |
280 | else |
281 | fprintf_unfiltered (file, "<unknown>"); | |
282 | fprintf_unfiltered (file, ","); | |
283 | fprintf_unfiltered (file, "id="); | |
284 | if (fi->this_id.p) | |
285 | fprint_frame_id (file, fi->this_id.value); | |
286 | else | |
287 | fprintf_unfiltered (file, "<unknown>"); | |
288 | fprintf_unfiltered (file, ","); | |
289 | fprintf_unfiltered (file, "func="); | |
290 | if (fi->next != NULL && fi->next->prev_func.p) | |
5af949e3 | 291 | fprintf_unfiltered (file, "%s", hex_string (fi->next->prev_func.addr)); |
7f78e237 AC |
292 | else |
293 | fprintf_unfiltered (file, "<unknown>"); | |
294 | fprintf_unfiltered (file, "}"); | |
295 | } | |
296 | ||
edb3359d DJ |
297 | /* Given FRAME, return the enclosing normal frame for inlined |
298 | function frames. Otherwise return the original frame. */ | |
299 | ||
300 | static struct frame_info * | |
301 | skip_inlined_frames (struct frame_info *frame) | |
302 | { | |
303 | while (get_frame_type (frame) == INLINE_FRAME) | |
304 | frame = get_prev_frame (frame); | |
305 | ||
306 | return frame; | |
307 | } | |
308 | ||
7a424e99 | 309 | /* Return a frame uniq ID that can be used to, later, re-find the |
101dcfbe AC |
310 | frame. */ |
311 | ||
7a424e99 AC |
312 | struct frame_id |
313 | get_frame_id (struct frame_info *fi) | |
101dcfbe AC |
314 | { |
315 | if (fi == NULL) | |
b83e9eb7 JB |
316 | return null_frame_id; |
317 | ||
d0a55772 | 318 | if (!fi->this_id.p) |
101dcfbe | 319 | { |
7f78e237 AC |
320 | if (frame_debug) |
321 | fprintf_unfiltered (gdb_stdlog, "{ get_frame_id (fi=%d) ", | |
322 | fi->level); | |
c50901fd AC |
323 | /* Find the unwinder. */ |
324 | if (fi->unwind == NULL) | |
669fac23 | 325 | fi->unwind = frame_unwind_find_by_frame (fi, &fi->prologue_cache); |
06c77151 | 326 | /* Find THIS frame's ID. */ |
005ca36a JB |
327 | /* Default to outermost if no ID is found. */ |
328 | fi->this_id.value = outer_frame_id; | |
669fac23 | 329 | fi->unwind->this_id (fi, &fi->prologue_cache, &fi->this_id.value); |
005ca36a | 330 | gdb_assert (frame_id_p (fi->this_id.value)); |
d0a55772 | 331 | fi->this_id.p = 1; |
7f78e237 AC |
332 | if (frame_debug) |
333 | { | |
334 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
335 | fprint_frame_id (gdb_stdlog, fi->this_id.value); | |
336 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
337 | } | |
101dcfbe | 338 | } |
b83e9eb7 JB |
339 | |
340 | frame_stash_add (fi); | |
341 | ||
18adea3f | 342 | return fi->this_id.value; |
101dcfbe AC |
343 | } |
344 | ||
edb3359d DJ |
345 | struct frame_id |
346 | get_stack_frame_id (struct frame_info *next_frame) | |
347 | { | |
348 | return get_frame_id (skip_inlined_frames (next_frame)); | |
349 | } | |
350 | ||
5613d8d3 | 351 | struct frame_id |
c7ce8faa | 352 | frame_unwind_caller_id (struct frame_info *next_frame) |
5613d8d3 | 353 | { |
edb3359d DJ |
354 | struct frame_info *this_frame; |
355 | ||
356 | /* Use get_prev_frame_1, and not get_prev_frame. The latter will truncate | |
5613d8d3 AC |
357 | the frame chain, leading to this function unintentionally |
358 | returning a null_frame_id (e.g., when a caller requests the frame | |
359 | ID of "main()"s caller. */ | |
edb3359d DJ |
360 | |
361 | next_frame = skip_inlined_frames (next_frame); | |
362 | this_frame = get_prev_frame_1 (next_frame); | |
363 | if (this_frame) | |
364 | return get_frame_id (skip_inlined_frames (this_frame)); | |
365 | else | |
366 | return null_frame_id; | |
5613d8d3 AC |
367 | } |
368 | ||
7a424e99 | 369 | const struct frame_id null_frame_id; /* All zeros. */ |
005ca36a | 370 | const struct frame_id outer_frame_id = { 0, 0, 0, 0, 0, 1, 0 }; |
7a424e99 AC |
371 | |
372 | struct frame_id | |
48c66725 JJ |
373 | frame_id_build_special (CORE_ADDR stack_addr, CORE_ADDR code_addr, |
374 | CORE_ADDR special_addr) | |
7a424e99 | 375 | { |
12b0b6de | 376 | struct frame_id id = null_frame_id; |
d0a55772 | 377 | id.stack_addr = stack_addr; |
12b0b6de | 378 | id.stack_addr_p = 1; |
d0a55772 | 379 | id.code_addr = code_addr; |
12b0b6de | 380 | id.code_addr_p = 1; |
48c66725 | 381 | id.special_addr = special_addr; |
12b0b6de | 382 | id.special_addr_p = 1; |
7a424e99 AC |
383 | return id; |
384 | } | |
385 | ||
48c66725 JJ |
386 | struct frame_id |
387 | frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr) | |
388 | { | |
12b0b6de UW |
389 | struct frame_id id = null_frame_id; |
390 | id.stack_addr = stack_addr; | |
391 | id.stack_addr_p = 1; | |
392 | id.code_addr = code_addr; | |
393 | id.code_addr_p = 1; | |
394 | return id; | |
395 | } | |
396 | ||
397 | struct frame_id | |
398 | frame_id_build_wild (CORE_ADDR stack_addr) | |
399 | { | |
400 | struct frame_id id = null_frame_id; | |
401 | id.stack_addr = stack_addr; | |
402 | id.stack_addr_p = 1; | |
403 | return id; | |
48c66725 JJ |
404 | } |
405 | ||
7a424e99 AC |
406 | int |
407 | frame_id_p (struct frame_id l) | |
408 | { | |
d0a55772 | 409 | int p; |
12b0b6de UW |
410 | /* The frame is valid iff it has a valid stack address. */ |
411 | p = l.stack_addr_p; | |
005ca36a JB |
412 | /* outer_frame_id is also valid. */ |
413 | if (!p && memcmp (&l, &outer_frame_id, sizeof (l)) == 0) | |
414 | p = 1; | |
7f78e237 AC |
415 | if (frame_debug) |
416 | { | |
417 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_p (l="); | |
418 | fprint_frame_id (gdb_stdlog, l); | |
419 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", p); | |
420 | } | |
d0a55772 | 421 | return p; |
7a424e99 AC |
422 | } |
423 | ||
edb3359d DJ |
424 | int |
425 | frame_id_inlined_p (struct frame_id l) | |
426 | { | |
427 | if (!frame_id_p (l)) | |
428 | return 0; | |
429 | ||
430 | return (l.inline_depth != 0); | |
431 | } | |
432 | ||
7a424e99 AC |
433 | int |
434 | frame_id_eq (struct frame_id l, struct frame_id r) | |
435 | { | |
d0a55772 | 436 | int eq; |
005ca36a JB |
437 | if (!l.stack_addr_p && l.special_addr_p && !r.stack_addr_p && r.special_addr_p) |
438 | /* The outermost frame marker is equal to itself. This is the | |
439 | dodgy thing about outer_frame_id, since between execution steps | |
440 | we might step into another function - from which we can't | |
441 | unwind either. More thought required to get rid of | |
442 | outer_frame_id. */ | |
443 | eq = 1; | |
444 | else if (!l.stack_addr_p || !r.stack_addr_p) | |
12b0b6de UW |
445 | /* Like a NaN, if either ID is invalid, the result is false. |
446 | Note that a frame ID is invalid iff it is the null frame ID. */ | |
d0a55772 AC |
447 | eq = 0; |
448 | else if (l.stack_addr != r.stack_addr) | |
449 | /* If .stack addresses are different, the frames are different. */ | |
450 | eq = 0; | |
edb3359d DJ |
451 | else if (l.code_addr_p && r.code_addr_p && l.code_addr != r.code_addr) |
452 | /* An invalid code addr is a wild card. If .code addresses are | |
453 | different, the frames are different. */ | |
48c66725 | 454 | eq = 0; |
edb3359d DJ |
455 | else if (l.special_addr_p && r.special_addr_p |
456 | && l.special_addr != r.special_addr) | |
457 | /* An invalid special addr is a wild card (or unused). Otherwise | |
458 | if special addresses are different, the frames are different. */ | |
459 | eq = 0; | |
460 | else if (l.inline_depth != r.inline_depth) | |
461 | /* If inline depths are different, the frames must be different. */ | |
462 | eq = 0; | |
463 | else | |
48c66725 | 464 | /* Frames are equal. */ |
d0a55772 | 465 | eq = 1; |
edb3359d | 466 | |
7f78e237 AC |
467 | if (frame_debug) |
468 | { | |
469 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (l="); | |
470 | fprint_frame_id (gdb_stdlog, l); | |
471 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
472 | fprint_frame_id (gdb_stdlog, r); | |
473 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", eq); | |
474 | } | |
d0a55772 | 475 | return eq; |
7a424e99 AC |
476 | } |
477 | ||
a45ae3ed UW |
478 | /* Safety net to check whether frame ID L should be inner to |
479 | frame ID R, according to their stack addresses. | |
480 | ||
481 | This method cannot be used to compare arbitrary frames, as the | |
482 | ranges of valid stack addresses may be discontiguous (e.g. due | |
483 | to sigaltstack). | |
484 | ||
485 | However, it can be used as safety net to discover invalid frame | |
f06eadd9 JB |
486 | IDs in certain circumstances. Assuming that NEXT is the immediate |
487 | inner frame to THIS and that NEXT and THIS are both NORMAL frames: | |
a45ae3ed | 488 | |
f06eadd9 JB |
489 | * The stack address of NEXT must be inner-than-or-equal to the stack |
490 | address of THIS. | |
a45ae3ed UW |
491 | |
492 | Therefore, if frame_id_inner (THIS, NEXT) holds, some unwind | |
493 | error has occurred. | |
494 | ||
f06eadd9 JB |
495 | * If NEXT and THIS have different stack addresses, no other frame |
496 | in the frame chain may have a stack address in between. | |
a45ae3ed UW |
497 | |
498 | Therefore, if frame_id_inner (TEST, THIS) holds, but | |
499 | frame_id_inner (TEST, NEXT) does not hold, TEST cannot refer | |
f06eadd9 JB |
500 | to a valid frame in the frame chain. |
501 | ||
502 | The sanity checks above cannot be performed when a SIGTRAMP frame | |
503 | is involved, because signal handlers might be executed on a different | |
504 | stack than the stack used by the routine that caused the signal | |
505 | to be raised. This can happen for instance when a thread exceeds | |
506 | its maximum stack size. In this case, certain compilers implement | |
507 | a stack overflow strategy that cause the handler to be run on a | |
508 | different stack. */ | |
a45ae3ed UW |
509 | |
510 | static int | |
09a7aba8 | 511 | frame_id_inner (struct gdbarch *gdbarch, struct frame_id l, struct frame_id r) |
7a424e99 | 512 | { |
d0a55772 | 513 | int inner; |
12b0b6de | 514 | if (!l.stack_addr_p || !r.stack_addr_p) |
d0a55772 AC |
515 | /* Like NaN, any operation involving an invalid ID always fails. */ |
516 | inner = 0; | |
edb3359d DJ |
517 | else if (l.inline_depth > r.inline_depth |
518 | && l.stack_addr == r.stack_addr | |
519 | && l.code_addr_p == r.code_addr_p | |
520 | && l.special_addr_p == r.special_addr_p | |
521 | && l.special_addr == r.special_addr) | |
522 | { | |
523 | /* Same function, different inlined functions. */ | |
524 | struct block *lb, *rb; | |
525 | ||
526 | gdb_assert (l.code_addr_p && r.code_addr_p); | |
527 | ||
528 | lb = block_for_pc (l.code_addr); | |
529 | rb = block_for_pc (r.code_addr); | |
530 | ||
531 | if (lb == NULL || rb == NULL) | |
532 | /* Something's gone wrong. */ | |
533 | inner = 0; | |
534 | else | |
535 | /* This will return true if LB and RB are the same block, or | |
536 | if the block with the smaller depth lexically encloses the | |
537 | block with the greater depth. */ | |
538 | inner = contained_in (lb, rb); | |
539 | } | |
d0a55772 AC |
540 | else |
541 | /* Only return non-zero when strictly inner than. Note that, per | |
542 | comment in "frame.h", there is some fuzz here. Frameless | |
543 | functions are not strictly inner than (same .stack but | |
48c66725 | 544 | different .code and/or .special address). */ |
09a7aba8 | 545 | inner = gdbarch_inner_than (gdbarch, l.stack_addr, r.stack_addr); |
7f78e237 AC |
546 | if (frame_debug) |
547 | { | |
548 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_inner (l="); | |
549 | fprint_frame_id (gdb_stdlog, l); | |
550 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
551 | fprint_frame_id (gdb_stdlog, r); | |
552 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", inner); | |
553 | } | |
d0a55772 | 554 | return inner; |
7a424e99 AC |
555 | } |
556 | ||
101dcfbe AC |
557 | struct frame_info * |
558 | frame_find_by_id (struct frame_id id) | |
559 | { | |
a45ae3ed | 560 | struct frame_info *frame, *prev_frame; |
101dcfbe AC |
561 | |
562 | /* ZERO denotes the null frame, let the caller decide what to do | |
563 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 564 | if (!frame_id_p (id)) |
101dcfbe AC |
565 | return NULL; |
566 | ||
b83e9eb7 JB |
567 | /* Try using the frame stash first. Finding it there removes the need |
568 | to perform the search by looping over all frames, which can be very | |
569 | CPU-intensive if the number of frames is very high (the loop is O(n) | |
570 | and get_prev_frame performs a series of checks that are relatively | |
571 | expensive). This optimization is particularly useful when this function | |
572 | is called from another function (such as value_fetch_lazy, case | |
573 | VALUE_LVAL (val) == lval_register) which already loops over all frames, | |
574 | making the overall behavior O(n^2). */ | |
575 | frame = frame_stash_find (id); | |
576 | if (frame) | |
577 | return frame; | |
578 | ||
a45ae3ed | 579 | for (frame = get_current_frame (); ; frame = prev_frame) |
101dcfbe | 580 | { |
7a424e99 AC |
581 | struct frame_id this = get_frame_id (frame); |
582 | if (frame_id_eq (id, this)) | |
583 | /* An exact match. */ | |
584 | return frame; | |
a45ae3ed UW |
585 | |
586 | prev_frame = get_prev_frame (frame); | |
587 | if (!prev_frame) | |
588 | return NULL; | |
589 | ||
590 | /* As a safety net to avoid unnecessary backtracing while trying | |
591 | to find an invalid ID, we check for a common situation where | |
592 | we can detect from comparing stack addresses that no other | |
593 | frame in the current frame chain can have this ID. See the | |
594 | comment at frame_id_inner for details. */ | |
595 | if (get_frame_type (frame) == NORMAL_FRAME | |
596 | && !frame_id_inner (get_frame_arch (frame), id, this) | |
597 | && frame_id_inner (get_frame_arch (prev_frame), id, | |
598 | get_frame_id (prev_frame))) | |
101dcfbe | 599 | return NULL; |
101dcfbe AC |
600 | } |
601 | return NULL; | |
602 | } | |
603 | ||
edb3359d DJ |
604 | static CORE_ADDR |
605 | frame_unwind_pc (struct frame_info *this_frame) | |
f18c5a73 | 606 | { |
d1340264 | 607 | if (!this_frame->prev_pc.p) |
f18c5a73 | 608 | { |
12cc2063 | 609 | CORE_ADDR pc; |
36f15f55 | 610 | if (gdbarch_unwind_pc_p (frame_unwind_arch (this_frame))) |
12cc2063 AC |
611 | { |
612 | /* The right way. The `pure' way. The one true way. This | |
613 | method depends solely on the register-unwind code to | |
614 | determine the value of registers in THIS frame, and hence | |
615 | the value of this frame's PC (resume address). A typical | |
616 | implementation is no more than: | |
617 | ||
618 | frame_unwind_register (this_frame, ISA_PC_REGNUM, buf); | |
af1342ab | 619 | return extract_unsigned_integer (buf, size of ISA_PC_REGNUM); |
12cc2063 AC |
620 | |
621 | Note: this method is very heavily dependent on a correct | |
622 | register-unwind implementation, it pays to fix that | |
623 | method first; this method is frame type agnostic, since | |
624 | it only deals with register values, it works with any | |
625 | frame. This is all in stark contrast to the old | |
626 | FRAME_SAVED_PC which would try to directly handle all the | |
627 | different ways that a PC could be unwound. */ | |
36f15f55 | 628 | pc = gdbarch_unwind_pc (frame_unwind_arch (this_frame), this_frame); |
12cc2063 | 629 | } |
12cc2063 | 630 | else |
e2e0b3e5 | 631 | internal_error (__FILE__, __LINE__, _("No unwind_pc method")); |
d1340264 AC |
632 | this_frame->prev_pc.value = pc; |
633 | this_frame->prev_pc.p = 1; | |
7f78e237 AC |
634 | if (frame_debug) |
635 | fprintf_unfiltered (gdb_stdlog, | |
c7ce8faa | 636 | "{ frame_unwind_caller_pc (this_frame=%d) -> 0x%s }\n", |
7f78e237 | 637 | this_frame->level, |
5af949e3 | 638 | hex_string (this_frame->prev_pc.value)); |
f18c5a73 | 639 | } |
d1340264 | 640 | return this_frame->prev_pc.value; |
f18c5a73 AC |
641 | } |
642 | ||
edb3359d DJ |
643 | CORE_ADDR |
644 | frame_unwind_caller_pc (struct frame_info *this_frame) | |
645 | { | |
646 | return frame_unwind_pc (skip_inlined_frames (this_frame)); | |
647 | } | |
648 | ||
be41e9f4 | 649 | CORE_ADDR |
ef02daa9 | 650 | get_frame_func (struct frame_info *this_frame) |
be41e9f4 | 651 | { |
ef02daa9 DJ |
652 | struct frame_info *next_frame = this_frame->next; |
653 | ||
654 | if (!next_frame->prev_func.p) | |
be41e9f4 | 655 | { |
57bfe177 AC |
656 | /* Make certain that this, and not the adjacent, function is |
657 | found. */ | |
ef02daa9 DJ |
658 | CORE_ADDR addr_in_block = get_frame_address_in_block (this_frame); |
659 | next_frame->prev_func.p = 1; | |
660 | next_frame->prev_func.addr = get_pc_function_start (addr_in_block); | |
7f78e237 AC |
661 | if (frame_debug) |
662 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 | 663 | "{ get_frame_func (this_frame=%d) -> %s }\n", |
ef02daa9 | 664 | this_frame->level, |
5af949e3 | 665 | hex_string (next_frame->prev_func.addr)); |
be41e9f4 | 666 | } |
ef02daa9 | 667 | return next_frame->prev_func.addr; |
be41e9f4 AC |
668 | } |
669 | ||
7a25a7c1 | 670 | static int |
2d522557 | 671 | do_frame_register_read (void *src, int regnum, gdb_byte *buf) |
7a25a7c1 | 672 | { |
669fac23 | 673 | return frame_register_read (src, regnum, buf); |
7a25a7c1 AC |
674 | } |
675 | ||
a81dcb05 AC |
676 | struct regcache * |
677 | frame_save_as_regcache (struct frame_info *this_frame) | |
678 | { | |
b1bd0044 | 679 | struct regcache *regcache = regcache_xmalloc (get_frame_arch (this_frame)); |
a81dcb05 AC |
680 | struct cleanup *cleanups = make_cleanup_regcache_xfree (regcache); |
681 | regcache_save (regcache, do_frame_register_read, this_frame); | |
682 | discard_cleanups (cleanups); | |
683 | return regcache; | |
684 | } | |
685 | ||
dbe9fe58 | 686 | void |
7a25a7c1 AC |
687 | frame_pop (struct frame_info *this_frame) |
688 | { | |
348473d5 NF |
689 | struct frame_info *prev_frame; |
690 | struct regcache *scratch; | |
691 | struct cleanup *cleanups; | |
692 | ||
b89667eb DE |
693 | if (get_frame_type (this_frame) == DUMMY_FRAME) |
694 | { | |
695 | /* Popping a dummy frame involves restoring more than just registers. | |
696 | dummy_frame_pop does all the work. */ | |
697 | dummy_frame_pop (get_frame_id (this_frame)); | |
698 | return; | |
699 | } | |
700 | ||
348473d5 NF |
701 | /* Ensure that we have a frame to pop to. */ |
702 | prev_frame = get_prev_frame_1 (this_frame); | |
703 | ||
704 | if (!prev_frame) | |
705 | error (_("Cannot pop the initial frame.")); | |
706 | ||
c1bf6f65 AC |
707 | /* Make a copy of all the register values unwound from this frame. |
708 | Save them in a scratch buffer so that there isn't a race between | |
594f7785 | 709 | trying to extract the old values from the current regcache while |
c1bf6f65 | 710 | at the same time writing new values into that same cache. */ |
348473d5 NF |
711 | scratch = frame_save_as_regcache (prev_frame); |
712 | cleanups = make_cleanup_regcache_xfree (scratch); | |
c1bf6f65 AC |
713 | |
714 | /* FIXME: cagney/2003-03-16: It should be possible to tell the | |
715 | target's register cache that it is about to be hit with a burst | |
716 | register transfer and that the sequence of register writes should | |
717 | be batched. The pair target_prepare_to_store() and | |
718 | target_store_registers() kind of suggest this functionality. | |
719 | Unfortunately, they don't implement it. Their lack of a formal | |
720 | definition can lead to targets writing back bogus values | |
721 | (arguably a bug in the target code mind). */ | |
722 | /* Now copy those saved registers into the current regcache. | |
723 | Here, regcache_cpy() calls regcache_restore(). */ | |
594f7785 | 724 | regcache_cpy (get_current_regcache (), scratch); |
c1bf6f65 | 725 | do_cleanups (cleanups); |
7a25a7c1 | 726 | |
7a25a7c1 AC |
727 | /* We've made right mess of GDB's local state, just discard |
728 | everything. */ | |
35f196d9 | 729 | reinit_frame_cache (); |
dbe9fe58 | 730 | } |
c689142b | 731 | |
4f460812 AC |
732 | void |
733 | frame_register_unwind (struct frame_info *frame, int regnum, | |
734 | int *optimizedp, enum lval_type *lvalp, | |
10c42a71 | 735 | CORE_ADDR *addrp, int *realnump, gdb_byte *bufferp) |
4f460812 | 736 | { |
669fac23 | 737 | struct value *value; |
7f78e237 | 738 | |
4f460812 AC |
739 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates |
740 | that the value proper does not need to be fetched. */ | |
741 | gdb_assert (optimizedp != NULL); | |
742 | gdb_assert (lvalp != NULL); | |
743 | gdb_assert (addrp != NULL); | |
744 | gdb_assert (realnump != NULL); | |
745 | /* gdb_assert (bufferp != NULL); */ | |
746 | ||
669fac23 | 747 | value = frame_unwind_register_value (frame, regnum); |
4f460812 | 748 | |
669fac23 | 749 | gdb_assert (value != NULL); |
c50901fd | 750 | |
669fac23 DJ |
751 | *optimizedp = value_optimized_out (value); |
752 | *lvalp = VALUE_LVAL (value); | |
42ae5230 | 753 | *addrp = value_address (value); |
669fac23 | 754 | *realnump = VALUE_REGNUM (value); |
6dc42492 | 755 | |
669fac23 DJ |
756 | if (bufferp) |
757 | memcpy (bufferp, value_contents_all (value), | |
758 | TYPE_LENGTH (value_type (value))); | |
759 | ||
760 | /* Dispose of the new value. This prevents watchpoints from | |
761 | trying to watch the saved frame pointer. */ | |
762 | release_value (value); | |
763 | value_free (value); | |
4f460812 AC |
764 | } |
765 | ||
a216a322 AC |
766 | void |
767 | frame_register (struct frame_info *frame, int regnum, | |
768 | int *optimizedp, enum lval_type *lvalp, | |
10c42a71 | 769 | CORE_ADDR *addrp, int *realnump, gdb_byte *bufferp) |
a216a322 AC |
770 | { |
771 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates | |
772 | that the value proper does not need to be fetched. */ | |
773 | gdb_assert (optimizedp != NULL); | |
774 | gdb_assert (lvalp != NULL); | |
775 | gdb_assert (addrp != NULL); | |
776 | gdb_assert (realnump != NULL); | |
777 | /* gdb_assert (bufferp != NULL); */ | |
778 | ||
a94dd1fd AC |
779 | /* Obtain the register value by unwinding the register from the next |
780 | (more inner frame). */ | |
781 | gdb_assert (frame != NULL && frame->next != NULL); | |
782 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
783 | realnump, bufferp); | |
a216a322 AC |
784 | } |
785 | ||
135c175f | 786 | void |
10c42a71 | 787 | frame_unwind_register (struct frame_info *frame, int regnum, gdb_byte *buf) |
135c175f AC |
788 | { |
789 | int optimized; | |
790 | CORE_ADDR addr; | |
791 | int realnum; | |
792 | enum lval_type lval; | |
135c175f AC |
793 | frame_register_unwind (frame, regnum, &optimized, &lval, &addr, |
794 | &realnum, buf); | |
5b181d62 AC |
795 | } |
796 | ||
f0e7d0e8 AC |
797 | void |
798 | get_frame_register (struct frame_info *frame, | |
10c42a71 | 799 | int regnum, gdb_byte *buf) |
f0e7d0e8 AC |
800 | { |
801 | frame_unwind_register (frame->next, regnum, buf); | |
802 | } | |
803 | ||
669fac23 DJ |
804 | struct value * |
805 | frame_unwind_register_value (struct frame_info *frame, int regnum) | |
806 | { | |
36f15f55 | 807 | struct gdbarch *gdbarch; |
669fac23 DJ |
808 | struct value *value; |
809 | ||
810 | gdb_assert (frame != NULL); | |
36f15f55 | 811 | gdbarch = frame_unwind_arch (frame); |
669fac23 DJ |
812 | |
813 | if (frame_debug) | |
814 | { | |
815 | fprintf_unfiltered (gdb_stdlog, "\ | |
816 | { frame_unwind_register_value (frame=%d,regnum=%d(%s),...) ", | |
817 | frame->level, regnum, | |
36f15f55 | 818 | user_reg_map_regnum_to_name (gdbarch, regnum)); |
669fac23 DJ |
819 | } |
820 | ||
821 | /* Find the unwinder. */ | |
822 | if (frame->unwind == NULL) | |
823 | frame->unwind = frame_unwind_find_by_frame (frame, &frame->prologue_cache); | |
824 | ||
825 | /* Ask this frame to unwind its register. */ | |
826 | value = frame->unwind->prev_register (frame, &frame->prologue_cache, regnum); | |
827 | ||
828 | if (frame_debug) | |
829 | { | |
830 | fprintf_unfiltered (gdb_stdlog, "->"); | |
831 | if (value_optimized_out (value)) | |
832 | fprintf_unfiltered (gdb_stdlog, " optimized out"); | |
833 | else | |
834 | { | |
835 | if (VALUE_LVAL (value) == lval_register) | |
836 | fprintf_unfiltered (gdb_stdlog, " register=%d", | |
837 | VALUE_REGNUM (value)); | |
838 | else if (VALUE_LVAL (value) == lval_memory) | |
5af949e3 UW |
839 | fprintf_unfiltered (gdb_stdlog, " address=%s", |
840 | paddress (gdbarch, | |
841 | value_address (value))); | |
669fac23 DJ |
842 | else |
843 | fprintf_unfiltered (gdb_stdlog, " computed"); | |
844 | ||
845 | if (value_lazy (value)) | |
846 | fprintf_unfiltered (gdb_stdlog, " lazy"); | |
847 | else | |
848 | { | |
849 | int i; | |
850 | const gdb_byte *buf = value_contents (value); | |
851 | ||
852 | fprintf_unfiltered (gdb_stdlog, " bytes="); | |
853 | fprintf_unfiltered (gdb_stdlog, "["); | |
36f15f55 | 854 | for (i = 0; i < register_size (gdbarch, regnum); i++) |
669fac23 DJ |
855 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); |
856 | fprintf_unfiltered (gdb_stdlog, "]"); | |
857 | } | |
858 | } | |
859 | ||
860 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
861 | } | |
862 | ||
863 | return value; | |
864 | } | |
865 | ||
866 | struct value * | |
867 | get_frame_register_value (struct frame_info *frame, int regnum) | |
868 | { | |
869 | return frame_unwind_register_value (frame->next, regnum); | |
870 | } | |
871 | ||
f0e7d0e8 AC |
872 | LONGEST |
873 | frame_unwind_register_signed (struct frame_info *frame, int regnum) | |
874 | { | |
e17a4113 UW |
875 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
876 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
877 | int size = register_size (gdbarch, regnum); | |
10c42a71 | 878 | gdb_byte buf[MAX_REGISTER_SIZE]; |
f0e7d0e8 | 879 | frame_unwind_register (frame, regnum, buf); |
e17a4113 | 880 | return extract_signed_integer (buf, size, byte_order); |
f0e7d0e8 AC |
881 | } |
882 | ||
883 | LONGEST | |
884 | get_frame_register_signed (struct frame_info *frame, int regnum) | |
885 | { | |
886 | return frame_unwind_register_signed (frame->next, regnum); | |
887 | } | |
888 | ||
889 | ULONGEST | |
890 | frame_unwind_register_unsigned (struct frame_info *frame, int regnum) | |
891 | { | |
e17a4113 UW |
892 | struct gdbarch *gdbarch = frame_unwind_arch (frame); |
893 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
894 | int size = register_size (gdbarch, regnum); | |
10c42a71 | 895 | gdb_byte buf[MAX_REGISTER_SIZE]; |
f0e7d0e8 | 896 | frame_unwind_register (frame, regnum, buf); |
e17a4113 | 897 | return extract_unsigned_integer (buf, size, byte_order); |
f0e7d0e8 AC |
898 | } |
899 | ||
900 | ULONGEST | |
901 | get_frame_register_unsigned (struct frame_info *frame, int regnum) | |
902 | { | |
903 | return frame_unwind_register_unsigned (frame->next, regnum); | |
904 | } | |
905 | ||
ff2e87ac | 906 | void |
10c42a71 AC |
907 | put_frame_register (struct frame_info *frame, int regnum, |
908 | const gdb_byte *buf) | |
ff2e87ac AC |
909 | { |
910 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
911 | int realnum; | |
912 | int optim; | |
913 | enum lval_type lval; | |
914 | CORE_ADDR addr; | |
915 | frame_register (frame, regnum, &optim, &lval, &addr, &realnum, NULL); | |
916 | if (optim) | |
8a3fe4f8 | 917 | error (_("Attempt to assign to a value that was optimized out.")); |
ff2e87ac AC |
918 | switch (lval) |
919 | { | |
920 | case lval_memory: | |
921 | { | |
922 | /* FIXME: write_memory doesn't yet take constant buffers. | |
923 | Arrrg! */ | |
10c42a71 | 924 | gdb_byte tmp[MAX_REGISTER_SIZE]; |
ff2e87ac AC |
925 | memcpy (tmp, buf, register_size (gdbarch, regnum)); |
926 | write_memory (addr, tmp, register_size (gdbarch, regnum)); | |
927 | break; | |
928 | } | |
929 | case lval_register: | |
594f7785 | 930 | regcache_cooked_write (get_current_regcache (), realnum, buf); |
ff2e87ac AC |
931 | break; |
932 | default: | |
8a3fe4f8 | 933 | error (_("Attempt to assign to an unmodifiable value.")); |
ff2e87ac AC |
934 | } |
935 | } | |
936 | ||
cda5a58a | 937 | /* frame_register_read () |
d65fe839 | 938 | |
cda5a58a | 939 | Find and return the value of REGNUM for the specified stack frame. |
5bc602c7 | 940 | The number of bytes copied is REGISTER_SIZE (REGNUM). |
d65fe839 | 941 | |
cda5a58a | 942 | Returns 0 if the register value could not be found. */ |
d65fe839 | 943 | |
cda5a58a | 944 | int |
10c42a71 AC |
945 | frame_register_read (struct frame_info *frame, int regnum, |
946 | gdb_byte *myaddr) | |
d65fe839 | 947 | { |
a216a322 AC |
948 | int optimized; |
949 | enum lval_type lval; | |
950 | CORE_ADDR addr; | |
951 | int realnum; | |
952 | frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr); | |
d65fe839 | 953 | |
a216a322 | 954 | return !optimized; |
d65fe839 | 955 | } |
e36180d7 | 956 | |
00fa51f6 UW |
957 | int |
958 | get_frame_register_bytes (struct frame_info *frame, int regnum, | |
959 | CORE_ADDR offset, int len, gdb_byte *myaddr) | |
960 | { | |
961 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
3f27f2a4 AS |
962 | int i; |
963 | int maxsize; | |
68e007ca | 964 | int numregs; |
00fa51f6 UW |
965 | |
966 | /* Skip registers wholly inside of OFFSET. */ | |
967 | while (offset >= register_size (gdbarch, regnum)) | |
968 | { | |
969 | offset -= register_size (gdbarch, regnum); | |
970 | regnum++; | |
971 | } | |
972 | ||
26fae1d6 AS |
973 | /* Ensure that we will not read beyond the end of the register file. |
974 | This can only ever happen if the debug information is bad. */ | |
3f27f2a4 | 975 | maxsize = -offset; |
68e007ca AS |
976 | numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); |
977 | for (i = regnum; i < numregs; i++) | |
3f27f2a4 AS |
978 | { |
979 | int thissize = register_size (gdbarch, i); | |
980 | if (thissize == 0) | |
26fae1d6 | 981 | break; /* This register is not available on this architecture. */ |
3f27f2a4 AS |
982 | maxsize += thissize; |
983 | } | |
984 | if (len > maxsize) | |
985 | { | |
986 | warning (_("Bad debug information detected: " | |
987 | "Attempt to read %d bytes from registers."), len); | |
988 | return 0; | |
989 | } | |
990 | ||
00fa51f6 UW |
991 | /* Copy the data. */ |
992 | while (len > 0) | |
993 | { | |
994 | int curr_len = register_size (gdbarch, regnum) - offset; | |
995 | if (curr_len > len) | |
996 | curr_len = len; | |
997 | ||
998 | if (curr_len == register_size (gdbarch, regnum)) | |
999 | { | |
1000 | if (!frame_register_read (frame, regnum, myaddr)) | |
1001 | return 0; | |
1002 | } | |
1003 | else | |
1004 | { | |
1005 | gdb_byte buf[MAX_REGISTER_SIZE]; | |
1006 | if (!frame_register_read (frame, regnum, buf)) | |
1007 | return 0; | |
1008 | memcpy (myaddr, buf + offset, curr_len); | |
1009 | } | |
1010 | ||
765f065a | 1011 | myaddr += curr_len; |
00fa51f6 UW |
1012 | len -= curr_len; |
1013 | offset = 0; | |
1014 | regnum++; | |
1015 | } | |
1016 | ||
1017 | return 1; | |
1018 | } | |
1019 | ||
1020 | void | |
1021 | put_frame_register_bytes (struct frame_info *frame, int regnum, | |
1022 | CORE_ADDR offset, int len, const gdb_byte *myaddr) | |
1023 | { | |
1024 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
1025 | ||
1026 | /* Skip registers wholly inside of OFFSET. */ | |
1027 | while (offset >= register_size (gdbarch, regnum)) | |
1028 | { | |
1029 | offset -= register_size (gdbarch, regnum); | |
1030 | regnum++; | |
1031 | } | |
1032 | ||
1033 | /* Copy the data. */ | |
1034 | while (len > 0) | |
1035 | { | |
1036 | int curr_len = register_size (gdbarch, regnum) - offset; | |
1037 | if (curr_len > len) | |
1038 | curr_len = len; | |
1039 | ||
1040 | if (curr_len == register_size (gdbarch, regnum)) | |
1041 | { | |
1042 | put_frame_register (frame, regnum, myaddr); | |
1043 | } | |
1044 | else | |
1045 | { | |
1046 | gdb_byte buf[MAX_REGISTER_SIZE]; | |
1047 | frame_register_read (frame, regnum, buf); | |
1048 | memcpy (buf + offset, myaddr, curr_len); | |
1049 | put_frame_register (frame, regnum, buf); | |
1050 | } | |
1051 | ||
765f065a | 1052 | myaddr += curr_len; |
00fa51f6 UW |
1053 | len -= curr_len; |
1054 | offset = 0; | |
1055 | regnum++; | |
1056 | } | |
1057 | } | |
e36180d7 | 1058 | |
a94dd1fd AC |
1059 | /* Create a sentinel frame. */ |
1060 | ||
b9362cc7 | 1061 | static struct frame_info * |
a94dd1fd AC |
1062 | create_sentinel_frame (struct regcache *regcache) |
1063 | { | |
1064 | struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
a94dd1fd AC |
1065 | frame->level = -1; |
1066 | /* Explicitly initialize the sentinel frame's cache. Provide it | |
1067 | with the underlying regcache. In the future additional | |
1068 | information, such as the frame's thread will be added. */ | |
6dc42492 | 1069 | frame->prologue_cache = sentinel_frame_cache (regcache); |
a94dd1fd AC |
1070 | /* For the moment there is only one sentinel frame implementation. */ |
1071 | frame->unwind = sentinel_frame_unwind; | |
1072 | /* Link this frame back to itself. The frame is self referential | |
1073 | (the unwound PC is the same as the pc), so make it so. */ | |
1074 | frame->next = frame; | |
50bbdbd9 AC |
1075 | /* Make the sentinel frame's ID valid, but invalid. That way all |
1076 | comparisons with it should fail. */ | |
d0a55772 AC |
1077 | frame->this_id.p = 1; |
1078 | frame->this_id.value = null_frame_id; | |
7f78e237 AC |
1079 | if (frame_debug) |
1080 | { | |
1081 | fprintf_unfiltered (gdb_stdlog, "{ create_sentinel_frame (...) -> "); | |
1082 | fprint_frame (gdb_stdlog, frame); | |
1083 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1084 | } | |
a94dd1fd AC |
1085 | return frame; |
1086 | } | |
1087 | ||
4c1e7e9d AC |
1088 | /* Info about the innermost stack frame (contents of FP register) */ |
1089 | ||
1090 | static struct frame_info *current_frame; | |
1091 | ||
1092 | /* Cache for frame addresses already read by gdb. Valid only while | |
1093 | inferior is stopped. Control variables for the frame cache should | |
1094 | be local to this module. */ | |
1095 | ||
1096 | static struct obstack frame_cache_obstack; | |
1097 | ||
1098 | void * | |
479ab5a0 | 1099 | frame_obstack_zalloc (unsigned long size) |
4c1e7e9d | 1100 | { |
479ab5a0 AC |
1101 | void *data = obstack_alloc (&frame_cache_obstack, size); |
1102 | memset (data, 0, size); | |
1103 | return data; | |
4c1e7e9d AC |
1104 | } |
1105 | ||
a94dd1fd AC |
1106 | /* Return the innermost (currently executing) stack frame. This is |
1107 | split into two functions. The function unwind_to_current_frame() | |
1108 | is wrapped in catch exceptions so that, even when the unwind of the | |
1109 | sentinel frame fails, the function still returns a stack frame. */ | |
1110 | ||
1111 | static int | |
1112 | unwind_to_current_frame (struct ui_out *ui_out, void *args) | |
1113 | { | |
1114 | struct frame_info *frame = get_prev_frame (args); | |
bbde78fa | 1115 | /* A sentinel frame can fail to unwind, e.g., because its PC value |
a94dd1fd AC |
1116 | lands in somewhere like start. */ |
1117 | if (frame == NULL) | |
1118 | return 1; | |
1119 | current_frame = frame; | |
1120 | return 0; | |
1121 | } | |
4c1e7e9d AC |
1122 | |
1123 | struct frame_info * | |
1124 | get_current_frame (void) | |
1125 | { | |
0a1e1ca1 AC |
1126 | /* First check, and report, the lack of registers. Having GDB |
1127 | report "No stack!" or "No memory" when the target doesn't even | |
1128 | have registers is very confusing. Besides, "printcmd.exp" | |
1129 | explicitly checks that ``print $pc'' with no registers prints "No | |
1130 | registers". */ | |
a94dd1fd | 1131 | if (!target_has_registers) |
8a3fe4f8 | 1132 | error (_("No registers.")); |
0a1e1ca1 | 1133 | if (!target_has_stack) |
8a3fe4f8 | 1134 | error (_("No stack.")); |
a94dd1fd | 1135 | if (!target_has_memory) |
8a3fe4f8 | 1136 | error (_("No memory.")); |
d729566a PA |
1137 | if (ptid_equal (inferior_ptid, null_ptid)) |
1138 | error (_("No selected thread.")); | |
1139 | if (is_exited (inferior_ptid)) | |
1140 | error (_("Invalid selected thread.")); | |
8ea051c5 PA |
1141 | if (is_executing (inferior_ptid)) |
1142 | error (_("Target is executing.")); | |
1143 | ||
4c1e7e9d AC |
1144 | if (current_frame == NULL) |
1145 | { | |
a94dd1fd | 1146 | struct frame_info *sentinel_frame = |
594f7785 | 1147 | create_sentinel_frame (get_current_regcache ()); |
a94dd1fd | 1148 | if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame, |
1c3c7ee7 | 1149 | RETURN_MASK_ERROR) != 0) |
a94dd1fd AC |
1150 | { |
1151 | /* Oops! Fake a current frame? Is this useful? It has a PC | |
1152 | of zero, for instance. */ | |
1153 | current_frame = sentinel_frame; | |
1154 | } | |
4c1e7e9d AC |
1155 | } |
1156 | return current_frame; | |
1157 | } | |
1158 | ||
6e7f8b9c AC |
1159 | /* The "selected" stack frame is used by default for local and arg |
1160 | access. May be zero, for no selected frame. */ | |
1161 | ||
206415a3 | 1162 | static struct frame_info *selected_frame; |
6e7f8b9c | 1163 | |
9d49bdc2 | 1164 | int |
8ea051c5 PA |
1165 | has_stack_frames (void) |
1166 | { | |
1167 | if (!target_has_registers || !target_has_stack || !target_has_memory) | |
1168 | return 0; | |
1169 | ||
d729566a PA |
1170 | /* No current inferior, no frame. */ |
1171 | if (ptid_equal (inferior_ptid, null_ptid)) | |
1172 | return 0; | |
1173 | ||
1174 | /* Don't try to read from a dead thread. */ | |
1175 | if (is_exited (inferior_ptid)) | |
1176 | return 0; | |
1177 | ||
1178 | /* ... or from a spinning thread. */ | |
8ea051c5 PA |
1179 | if (is_executing (inferior_ptid)) |
1180 | return 0; | |
1181 | ||
1182 | return 1; | |
1183 | } | |
1184 | ||
bbde78fa | 1185 | /* Return the selected frame. Always non-NULL (unless there isn't an |
6e7f8b9c AC |
1186 | inferior sufficient for creating a frame) in which case an error is |
1187 | thrown. */ | |
1188 | ||
1189 | struct frame_info * | |
b04f3ab4 | 1190 | get_selected_frame (const char *message) |
6e7f8b9c | 1191 | { |
206415a3 | 1192 | if (selected_frame == NULL) |
b04f3ab4 | 1193 | { |
8ea051c5 | 1194 | if (message != NULL && !has_stack_frames ()) |
8a3fe4f8 | 1195 | error (("%s"), message); |
b04f3ab4 AC |
1196 | /* Hey! Don't trust this. It should really be re-finding the |
1197 | last selected frame of the currently selected thread. This, | |
1198 | though, is better than nothing. */ | |
1199 | select_frame (get_current_frame ()); | |
1200 | } | |
6e7f8b9c | 1201 | /* There is always a frame. */ |
206415a3 DJ |
1202 | gdb_assert (selected_frame != NULL); |
1203 | return selected_frame; | |
6e7f8b9c AC |
1204 | } |
1205 | ||
bbde78fa | 1206 | /* This is a variant of get_selected_frame() which can be called when |
7dd88986 | 1207 | the inferior does not have a frame; in that case it will return |
bbde78fa | 1208 | NULL instead of calling error(). */ |
7dd88986 DJ |
1209 | |
1210 | struct frame_info * | |
1211 | deprecated_safe_get_selected_frame (void) | |
1212 | { | |
8ea051c5 | 1213 | if (!has_stack_frames ()) |
7dd88986 | 1214 | return NULL; |
b04f3ab4 | 1215 | return get_selected_frame (NULL); |
7dd88986 DJ |
1216 | } |
1217 | ||
6e7f8b9c AC |
1218 | /* Select frame FI (or NULL - to invalidate the current frame). */ |
1219 | ||
1220 | void | |
1221 | select_frame (struct frame_info *fi) | |
1222 | { | |
52f0bd74 | 1223 | struct symtab *s; |
6e7f8b9c | 1224 | |
206415a3 | 1225 | selected_frame = fi; |
bbde78fa | 1226 | /* NOTE: cagney/2002-05-04: FI can be NULL. This occurs when the |
6e7f8b9c | 1227 | frame is being invalidated. */ |
9a4105ab AC |
1228 | if (deprecated_selected_frame_level_changed_hook) |
1229 | deprecated_selected_frame_level_changed_hook (frame_relative_level (fi)); | |
6e7f8b9c AC |
1230 | |
1231 | /* FIXME: kseitz/2002-08-28: It would be nice to call | |
bbde78fa | 1232 | selected_frame_level_changed_event() right here, but due to limitations |
6e7f8b9c | 1233 | in the current interfaces, we would end up flooding UIs with events |
bbde78fa | 1234 | because select_frame() is used extensively internally. |
6e7f8b9c AC |
1235 | |
1236 | Once we have frame-parameterized frame (and frame-related) commands, | |
1237 | the event notification can be moved here, since this function will only | |
bbde78fa | 1238 | be called when the user's selected frame is being changed. */ |
6e7f8b9c AC |
1239 | |
1240 | /* Ensure that symbols for this frame are read in. Also, determine the | |
1241 | source language of this frame, and switch to it if desired. */ | |
1242 | if (fi) | |
1243 | { | |
7ae4c3a5 | 1244 | /* We retrieve the frame's symtab by using the frame PC. However |
bbde78fa | 1245 | we cannot use the frame PC as-is, because it usually points to |
7ae4c3a5 JB |
1246 | the instruction following the "call", which is sometimes the |
1247 | first instruction of another function. So we rely on | |
1248 | get_frame_address_in_block() which provides us with a PC which | |
1249 | is guaranteed to be inside the frame's code block. */ | |
1250 | s = find_pc_symtab (get_frame_address_in_block (fi)); | |
6e7f8b9c AC |
1251 | if (s |
1252 | && s->language != current_language->la_language | |
1253 | && s->language != language_unknown | |
1254 | && language_mode == language_mode_auto) | |
1255 | { | |
1256 | set_language (s->language); | |
1257 | } | |
1258 | } | |
1259 | } | |
c689142b | 1260 | |
4c1e7e9d AC |
1261 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. |
1262 | Always returns a non-NULL value. */ | |
1263 | ||
1264 | struct frame_info * | |
1265 | create_new_frame (CORE_ADDR addr, CORE_ADDR pc) | |
1266 | { | |
1267 | struct frame_info *fi; | |
4c1e7e9d | 1268 | |
7f78e237 AC |
1269 | if (frame_debug) |
1270 | { | |
1271 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
1272 | "{ create_new_frame (addr=%s, pc=%s) ", |
1273 | hex_string (addr), hex_string (pc)); | |
7f78e237 AC |
1274 | } |
1275 | ||
35d5d4ee | 1276 | fi = FRAME_OBSTACK_ZALLOC (struct frame_info); |
4c1e7e9d | 1277 | |
594f7785 | 1278 | fi->next = create_sentinel_frame (get_current_regcache ()); |
7df05f2b | 1279 | |
1e275f79 PA |
1280 | /* Set/update this frame's cached PC value, found in the next frame. |
1281 | Do this before looking for this frame's unwinder. A sniffer is | |
1282 | very likely to read this, and the corresponding unwinder is | |
1283 | entitled to rely that the PC doesn't magically change. */ | |
1284 | fi->next->prev_pc.value = pc; | |
1285 | fi->next->prev_pc.p = 1; | |
1286 | ||
7df05f2b AC |
1287 | /* Select/initialize both the unwind function and the frame's type |
1288 | based on the PC. */ | |
669fac23 | 1289 | fi->unwind = frame_unwind_find_by_frame (fi, &fi->prologue_cache); |
7df05f2b | 1290 | |
18adea3f | 1291 | fi->this_id.p = 1; |
1e275f79 | 1292 | fi->this_id.value = frame_id_build (addr, pc); |
4c1e7e9d | 1293 | |
7f78e237 AC |
1294 | if (frame_debug) |
1295 | { | |
1296 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1297 | fprint_frame (gdb_stdlog, fi); | |
1298 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1299 | } | |
1300 | ||
4c1e7e9d AC |
1301 | return fi; |
1302 | } | |
1303 | ||
03febf99 AC |
1304 | /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the |
1305 | innermost frame). Be careful to not fall off the bottom of the | |
1306 | frame chain and onto the sentinel frame. */ | |
4c1e7e9d AC |
1307 | |
1308 | struct frame_info * | |
03febf99 | 1309 | get_next_frame (struct frame_info *this_frame) |
4c1e7e9d | 1310 | { |
03febf99 AC |
1311 | if (this_frame->level > 0) |
1312 | return this_frame->next; | |
a94dd1fd AC |
1313 | else |
1314 | return NULL; | |
4c1e7e9d AC |
1315 | } |
1316 | ||
f4c5303c OF |
1317 | /* Observer for the target_changed event. */ |
1318 | ||
2c0b251b | 1319 | static void |
f4c5303c OF |
1320 | frame_observer_target_changed (struct target_ops *target) |
1321 | { | |
35f196d9 | 1322 | reinit_frame_cache (); |
f4c5303c OF |
1323 | } |
1324 | ||
4c1e7e9d AC |
1325 | /* Flush the entire frame cache. */ |
1326 | ||
1327 | void | |
35f196d9 | 1328 | reinit_frame_cache (void) |
4c1e7e9d | 1329 | { |
272dfcfd AS |
1330 | struct frame_info *fi; |
1331 | ||
1332 | /* Tear down all frame caches. */ | |
1333 | for (fi = current_frame; fi != NULL; fi = fi->prev) | |
1334 | { | |
1335 | if (fi->prologue_cache && fi->unwind->dealloc_cache) | |
1336 | fi->unwind->dealloc_cache (fi, fi->prologue_cache); | |
1337 | if (fi->base_cache && fi->base->unwind->dealloc_cache) | |
1338 | fi->base->unwind->dealloc_cache (fi, fi->base_cache); | |
1339 | } | |
1340 | ||
4c1e7e9d AC |
1341 | /* Since we can't really be sure what the first object allocated was */ |
1342 | obstack_free (&frame_cache_obstack, 0); | |
1343 | obstack_init (&frame_cache_obstack); | |
1344 | ||
0d6ba1b1 DJ |
1345 | if (current_frame != NULL) |
1346 | annotate_frames_invalid (); | |
1347 | ||
4c1e7e9d AC |
1348 | current_frame = NULL; /* Invalidate cache */ |
1349 | select_frame (NULL); | |
b83e9eb7 | 1350 | frame_stash_invalidate (); |
7f78e237 | 1351 | if (frame_debug) |
35f196d9 | 1352 | fprintf_unfiltered (gdb_stdlog, "{ reinit_frame_cache () }\n"); |
4c1e7e9d AC |
1353 | } |
1354 | ||
e48af409 DJ |
1355 | /* Find where a register is saved (in memory or another register). |
1356 | The result of frame_register_unwind is just where it is saved | |
5efde112 | 1357 | relative to this particular frame. */ |
e48af409 DJ |
1358 | |
1359 | static void | |
1360 | frame_register_unwind_location (struct frame_info *this_frame, int regnum, | |
1361 | int *optimizedp, enum lval_type *lvalp, | |
1362 | CORE_ADDR *addrp, int *realnump) | |
1363 | { | |
1364 | gdb_assert (this_frame == NULL || this_frame->level >= 0); | |
1365 | ||
1366 | while (this_frame != NULL) | |
1367 | { | |
1368 | frame_register_unwind (this_frame, regnum, optimizedp, lvalp, | |
1369 | addrp, realnump, NULL); | |
1370 | ||
1371 | if (*optimizedp) | |
1372 | break; | |
1373 | ||
1374 | if (*lvalp != lval_register) | |
1375 | break; | |
1376 | ||
1377 | regnum = *realnump; | |
1378 | this_frame = get_next_frame (this_frame); | |
1379 | } | |
1380 | } | |
1381 | ||
5613d8d3 AC |
1382 | /* Return a "struct frame_info" corresponding to the frame that called |
1383 | THIS_FRAME. Returns NULL if there is no such frame. | |
5bf00f29 | 1384 | |
5613d8d3 AC |
1385 | Unlike get_prev_frame, this function always tries to unwind the |
1386 | frame. */ | |
eb4f72c5 | 1387 | |
5613d8d3 AC |
1388 | static struct frame_info * |
1389 | get_prev_frame_1 (struct frame_info *this_frame) | |
eb4f72c5 | 1390 | { |
756e95f1 | 1391 | struct frame_id this_id; |
b1bd0044 | 1392 | struct gdbarch *gdbarch; |
eb4f72c5 | 1393 | |
5613d8d3 | 1394 | gdb_assert (this_frame != NULL); |
b1bd0044 | 1395 | gdbarch = get_frame_arch (this_frame); |
5613d8d3 | 1396 | |
7f78e237 AC |
1397 | if (frame_debug) |
1398 | { | |
5613d8d3 | 1399 | fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame_1 (this_frame="); |
7f78e237 AC |
1400 | if (this_frame != NULL) |
1401 | fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level); | |
1402 | else | |
1403 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
1404 | fprintf_unfiltered (gdb_stdlog, ") "); | |
1405 | } | |
1406 | ||
5613d8d3 AC |
1407 | /* Only try to do the unwind once. */ |
1408 | if (this_frame->prev_p) | |
1409 | { | |
1410 | if (frame_debug) | |
1411 | { | |
1412 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1413 | fprint_frame (gdb_stdlog, this_frame->prev); | |
1414 | fprintf_unfiltered (gdb_stdlog, " // cached \n"); | |
1415 | } | |
1416 | return this_frame->prev; | |
1417 | } | |
8fa75a5d | 1418 | |
0d254d6f DJ |
1419 | /* If the frame unwinder hasn't been selected yet, we must do so |
1420 | before setting prev_p; otherwise the check for misbehaved | |
1421 | sniffers will think that this frame's sniffer tried to unwind | |
1422 | further (see frame_cleanup_after_sniffer). */ | |
1423 | if (this_frame->unwind == NULL) | |
1424 | this_frame->unwind | |
1425 | = frame_unwind_find_by_frame (this_frame, &this_frame->prologue_cache); | |
8fa75a5d | 1426 | |
5613d8d3 | 1427 | this_frame->prev_p = 1; |
55feb689 | 1428 | this_frame->stop_reason = UNWIND_NO_REASON; |
5613d8d3 | 1429 | |
edb3359d DJ |
1430 | /* If we are unwinding from an inline frame, all of the below tests |
1431 | were already performed when we unwound from the next non-inline | |
1432 | frame. We must skip them, since we can not get THIS_FRAME's ID | |
1433 | until we have unwound all the way down to the previous non-inline | |
1434 | frame. */ | |
1435 | if (get_frame_type (this_frame) == INLINE_FRAME) | |
1436 | return get_prev_frame_raw (this_frame); | |
1437 | ||
5613d8d3 AC |
1438 | /* Check that this frame's ID was valid. If it wasn't, don't try to |
1439 | unwind to the prev frame. Be careful to not apply this test to | |
1440 | the sentinel frame. */ | |
0d254d6f | 1441 | this_id = get_frame_id (this_frame); |
005ca36a | 1442 | if (this_frame->level >= 0 && frame_id_eq (this_id, outer_frame_id)) |
5613d8d3 AC |
1443 | { |
1444 | if (frame_debug) | |
1445 | { | |
1446 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1447 | fprint_frame (gdb_stdlog, NULL); | |
1448 | fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n"); | |
1449 | } | |
55feb689 | 1450 | this_frame->stop_reason = UNWIND_NULL_ID; |
5613d8d3 AC |
1451 | return NULL; |
1452 | } | |
1453 | ||
1454 | /* Check that this frame's ID isn't inner to (younger, below, next) | |
1455 | the next frame. This happens when a frame unwind goes backwards. | |
f06eadd9 JB |
1456 | This check is valid only if this frame and the next frame are NORMAL. |
1457 | See the comment at frame_id_inner for details. */ | |
1458 | if (get_frame_type (this_frame) == NORMAL_FRAME | |
1459 | && this_frame->next->unwind->type == NORMAL_FRAME | |
a45ae3ed | 1460 | && frame_id_inner (get_frame_arch (this_frame->next), this_id, |
09a7aba8 | 1461 | get_frame_id (this_frame->next))) |
55feb689 DJ |
1462 | { |
1463 | if (frame_debug) | |
1464 | { | |
1465 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1466 | fprint_frame (gdb_stdlog, NULL); | |
1467 | fprintf_unfiltered (gdb_stdlog, " // this frame ID is inner }\n"); | |
1468 | } | |
1469 | this_frame->stop_reason = UNWIND_INNER_ID; | |
1470 | return NULL; | |
1471 | } | |
5613d8d3 AC |
1472 | |
1473 | /* Check that this and the next frame are not identical. If they | |
1474 | are, there is most likely a stack cycle. As with the inner-than | |
1475 | test above, avoid comparing the inner-most and sentinel frames. */ | |
1476 | if (this_frame->level > 0 | |
756e95f1 | 1477 | && frame_id_eq (this_id, get_frame_id (this_frame->next))) |
55feb689 DJ |
1478 | { |
1479 | if (frame_debug) | |
1480 | { | |
1481 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1482 | fprint_frame (gdb_stdlog, NULL); | |
1483 | fprintf_unfiltered (gdb_stdlog, " // this frame has same ID }\n"); | |
1484 | } | |
1485 | this_frame->stop_reason = UNWIND_SAME_ID; | |
1486 | return NULL; | |
1487 | } | |
5613d8d3 | 1488 | |
e48af409 DJ |
1489 | /* Check that this and the next frame do not unwind the PC register |
1490 | to the same memory location. If they do, then even though they | |
1491 | have different frame IDs, the new frame will be bogus; two | |
1492 | functions can't share a register save slot for the PC. This can | |
1493 | happen when the prologue analyzer finds a stack adjustment, but | |
d57df5e4 DJ |
1494 | no PC save. |
1495 | ||
1496 | This check does assume that the "PC register" is roughly a | |
1497 | traditional PC, even if the gdbarch_unwind_pc method adjusts | |
1498 | it (we do not rely on the value, only on the unwound PC being | |
1499 | dependent on this value). A potential improvement would be | |
1500 | to have the frame prev_pc method and the gdbarch unwind_pc | |
1501 | method set the same lval and location information as | |
1502 | frame_register_unwind. */ | |
e48af409 | 1503 | if (this_frame->level > 0 |
b1bd0044 | 1504 | && gdbarch_pc_regnum (gdbarch) >= 0 |
e48af409 | 1505 | && get_frame_type (this_frame) == NORMAL_FRAME |
edb3359d DJ |
1506 | && (get_frame_type (this_frame->next) == NORMAL_FRAME |
1507 | || get_frame_type (this_frame->next) == INLINE_FRAME)) | |
e48af409 | 1508 | { |
32276632 | 1509 | int optimized, realnum, nrealnum; |
e48af409 DJ |
1510 | enum lval_type lval, nlval; |
1511 | CORE_ADDR addr, naddr; | |
1512 | ||
3e8c568d | 1513 | frame_register_unwind_location (this_frame, |
b1bd0044 | 1514 | gdbarch_pc_regnum (gdbarch), |
3e8c568d UW |
1515 | &optimized, &lval, &addr, &realnum); |
1516 | frame_register_unwind_location (get_next_frame (this_frame), | |
b1bd0044 | 1517 | gdbarch_pc_regnum (gdbarch), |
32276632 | 1518 | &optimized, &nlval, &naddr, &nrealnum); |
e48af409 | 1519 | |
32276632 DJ |
1520 | if ((lval == lval_memory && lval == nlval && addr == naddr) |
1521 | || (lval == lval_register && lval == nlval && realnum == nrealnum)) | |
e48af409 DJ |
1522 | { |
1523 | if (frame_debug) | |
1524 | { | |
1525 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1526 | fprint_frame (gdb_stdlog, NULL); | |
1527 | fprintf_unfiltered (gdb_stdlog, " // no saved PC }\n"); | |
1528 | } | |
1529 | ||
1530 | this_frame->stop_reason = UNWIND_NO_SAVED_PC; | |
1531 | this_frame->prev = NULL; | |
1532 | return NULL; | |
1533 | } | |
1534 | } | |
1535 | ||
edb3359d DJ |
1536 | return get_prev_frame_raw (this_frame); |
1537 | } | |
1538 | ||
1539 | /* Construct a new "struct frame_info" and link it previous to | |
1540 | this_frame. */ | |
1541 | ||
1542 | static struct frame_info * | |
1543 | get_prev_frame_raw (struct frame_info *this_frame) | |
1544 | { | |
1545 | struct frame_info *prev_frame; | |
1546 | ||
5613d8d3 AC |
1547 | /* Allocate the new frame but do not wire it in to the frame chain. |
1548 | Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along | |
1549 | frame->next to pull some fancy tricks (of course such code is, by | |
1550 | definition, recursive). Try to prevent it. | |
1551 | ||
1552 | There is no reason to worry about memory leaks, should the | |
1553 | remainder of the function fail. The allocated memory will be | |
1554 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1555 | been here before' check above will stop repeated memory | |
1556 | allocation calls. */ | |
1557 | prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
1558 | prev_frame->level = this_frame->level + 1; | |
1559 | ||
1560 | /* Don't yet compute ->unwind (and hence ->type). It is computed | |
1561 | on-demand in get_frame_type, frame_register_unwind, and | |
1562 | get_frame_id. */ | |
1563 | ||
1564 | /* Don't yet compute the frame's ID. It is computed on-demand by | |
1565 | get_frame_id(). */ | |
1566 | ||
1567 | /* The unwound frame ID is validate at the start of this function, | |
1568 | as part of the logic to decide if that frame should be further | |
1569 | unwound, and not here while the prev frame is being created. | |
1570 | Doing this makes it possible for the user to examine a frame that | |
1571 | has an invalid frame ID. | |
1572 | ||
1573 | Some very old VAX code noted: [...] For the sake of argument, | |
1574 | suppose that the stack is somewhat trashed (which is one reason | |
1575 | that "info frame" exists). So, return 0 (indicating we don't | |
1576 | know the address of the arglist) if we don't know what frame this | |
1577 | frame calls. */ | |
1578 | ||
1579 | /* Link it in. */ | |
1580 | this_frame->prev = prev_frame; | |
1581 | prev_frame->next = this_frame; | |
1582 | ||
1583 | if (frame_debug) | |
1584 | { | |
1585 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1586 | fprint_frame (gdb_stdlog, prev_frame); | |
1587 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1588 | } | |
1589 | ||
1590 | return prev_frame; | |
1591 | } | |
1592 | ||
1593 | /* Debug routine to print a NULL frame being returned. */ | |
1594 | ||
1595 | static void | |
d2bf72c0 | 1596 | frame_debug_got_null_frame (struct frame_info *this_frame, |
5613d8d3 AC |
1597 | const char *reason) |
1598 | { | |
1599 | if (frame_debug) | |
1600 | { | |
1601 | fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame="); | |
1602 | if (this_frame != NULL) | |
1603 | fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level); | |
1604 | else | |
1605 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
1606 | fprintf_unfiltered (gdb_stdlog, ") -> // %s}\n", reason); | |
1607 | } | |
1608 | } | |
1609 | ||
c8cd9f6c AC |
1610 | /* Is this (non-sentinel) frame in the "main"() function? */ |
1611 | ||
1612 | static int | |
1613 | inside_main_func (struct frame_info *this_frame) | |
1614 | { | |
1615 | struct minimal_symbol *msymbol; | |
1616 | CORE_ADDR maddr; | |
1617 | ||
1618 | if (symfile_objfile == 0) | |
1619 | return 0; | |
1620 | msymbol = lookup_minimal_symbol (main_name (), NULL, symfile_objfile); | |
1621 | if (msymbol == NULL) | |
1622 | return 0; | |
1623 | /* Make certain that the code, and not descriptor, address is | |
1624 | returned. */ | |
b1bd0044 | 1625 | maddr = gdbarch_convert_from_func_ptr_addr (get_frame_arch (this_frame), |
c8cd9f6c AC |
1626 | SYMBOL_VALUE_ADDRESS (msymbol), |
1627 | ¤t_target); | |
1628 | return maddr == get_frame_func (this_frame); | |
1629 | } | |
1630 | ||
2315ffec RC |
1631 | /* Test whether THIS_FRAME is inside the process entry point function. */ |
1632 | ||
1633 | static int | |
1634 | inside_entry_func (struct frame_info *this_frame) | |
1635 | { | |
1636 | return (get_frame_func (this_frame) == entry_point_address ()); | |
1637 | } | |
1638 | ||
5613d8d3 AC |
1639 | /* Return a structure containing various interesting information about |
1640 | the frame that called THIS_FRAME. Returns NULL if there is entier | |
1641 | no such frame or the frame fails any of a set of target-independent | |
1642 | condition that should terminate the frame chain (e.g., as unwinding | |
1643 | past main()). | |
1644 | ||
1645 | This function should not contain target-dependent tests, such as | |
1646 | checking whether the program-counter is zero. */ | |
1647 | ||
1648 | struct frame_info * | |
1649 | get_prev_frame (struct frame_info *this_frame) | |
1650 | { | |
1651 | struct frame_info *prev_frame; | |
1652 | ||
eb4f72c5 AC |
1653 | /* There is always a frame. If this assertion fails, suspect that |
1654 | something should be calling get_selected_frame() or | |
1655 | get_current_frame(). */ | |
03febf99 | 1656 | gdb_assert (this_frame != NULL); |
eb4f72c5 | 1657 | |
cc9bed83 RC |
1658 | /* tausq/2004-12-07: Dummy frames are skipped because it doesn't make much |
1659 | sense to stop unwinding at a dummy frame. One place where a dummy | |
1660 | frame may have an address "inside_main_func" is on HPUX. On HPUX, the | |
1661 | pcsqh register (space register for the instruction at the head of the | |
1662 | instruction queue) cannot be written directly; the only way to set it | |
1663 | is to branch to code that is in the target space. In order to implement | |
1664 | frame dummies on HPUX, the called function is made to jump back to where | |
1665 | the inferior was when the user function was called. If gdb was inside | |
1666 | the main function when we created the dummy frame, the dummy frame will | |
1667 | point inside the main function. */ | |
03febf99 | 1668 | if (this_frame->level >= 0 |
edb3359d | 1669 | && get_frame_type (this_frame) == NORMAL_FRAME |
25d29d70 | 1670 | && !backtrace_past_main |
c8cd9f6c AC |
1671 | && inside_main_func (this_frame)) |
1672 | /* Don't unwind past main(). Note, this is done _before_ the | |
1673 | frame has been marked as previously unwound. That way if the | |
1674 | user later decides to enable unwinds past main(), that will | |
1675 | automatically happen. */ | |
ac2bd0a9 | 1676 | { |
d2bf72c0 | 1677 | frame_debug_got_null_frame (this_frame, "inside main func"); |
ac2bd0a9 AC |
1678 | return NULL; |
1679 | } | |
eb4f72c5 | 1680 | |
4a5e53e8 DJ |
1681 | /* If the user's backtrace limit has been exceeded, stop. We must |
1682 | add two to the current level; one of those accounts for backtrace_limit | |
1683 | being 1-based and the level being 0-based, and the other accounts for | |
1684 | the level of the new frame instead of the level of the current | |
1685 | frame. */ | |
1686 | if (this_frame->level + 2 > backtrace_limit) | |
25d29d70 | 1687 | { |
d2bf72c0 | 1688 | frame_debug_got_null_frame (this_frame, "backtrace limit exceeded"); |
4a5e53e8 | 1689 | return NULL; |
25d29d70 AC |
1690 | } |
1691 | ||
0714963c AC |
1692 | /* If we're already inside the entry function for the main objfile, |
1693 | then it isn't valid. Don't apply this test to a dummy frame - | |
bbde78fa | 1694 | dummy frame PCs typically land in the entry func. Don't apply |
0714963c AC |
1695 | this test to the sentinel frame. Sentinel frames should always |
1696 | be allowed to unwind. */ | |
2f72f850 AC |
1697 | /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func() - |
1698 | wasn't checking for "main" in the minimal symbols. With that | |
1699 | fixed asm-source tests now stop in "main" instead of halting the | |
bbde78fa | 1700 | backtrace in weird and wonderful ways somewhere inside the entry |
2f72f850 AC |
1701 | file. Suspect that tests for inside the entry file/func were |
1702 | added to work around that (now fixed) case. */ | |
0714963c AC |
1703 | /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right) |
1704 | suggested having the inside_entry_func test use the | |
bbde78fa JM |
1705 | inside_main_func() msymbol trick (along with entry_point_address() |
1706 | I guess) to determine the address range of the start function. | |
0714963c AC |
1707 | That should provide a far better stopper than the current |
1708 | heuristics. */ | |
2315ffec RC |
1709 | /* NOTE: tausq/2004-10-09: this is needed if, for example, the compiler |
1710 | applied tail-call optimizations to main so that a function called | |
1711 | from main returns directly to the caller of main. Since we don't | |
1712 | stop at main, we should at least stop at the entry point of the | |
1713 | application. */ | |
edb3359d DJ |
1714 | if (this_frame->level >= 0 |
1715 | && get_frame_type (this_frame) == NORMAL_FRAME | |
1716 | && !backtrace_past_entry | |
6e4c6c91 | 1717 | && inside_entry_func (this_frame)) |
0714963c | 1718 | { |
d2bf72c0 | 1719 | frame_debug_got_null_frame (this_frame, "inside entry func"); |
0714963c AC |
1720 | return NULL; |
1721 | } | |
1722 | ||
39ee2ff0 AC |
1723 | /* Assume that the only way to get a zero PC is through something |
1724 | like a SIGSEGV or a dummy frame, and hence that NORMAL frames | |
1725 | will never unwind a zero PC. */ | |
1726 | if (this_frame->level > 0 | |
edb3359d DJ |
1727 | && (get_frame_type (this_frame) == NORMAL_FRAME |
1728 | || get_frame_type (this_frame) == INLINE_FRAME) | |
39ee2ff0 AC |
1729 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME |
1730 | && get_frame_pc (this_frame) == 0) | |
1731 | { | |
d2bf72c0 | 1732 | frame_debug_got_null_frame (this_frame, "zero PC"); |
39ee2ff0 AC |
1733 | return NULL; |
1734 | } | |
1735 | ||
5613d8d3 | 1736 | return get_prev_frame_1 (this_frame); |
eb4f72c5 AC |
1737 | } |
1738 | ||
4c1e7e9d AC |
1739 | CORE_ADDR |
1740 | get_frame_pc (struct frame_info *frame) | |
1741 | { | |
d1340264 | 1742 | gdb_assert (frame->next != NULL); |
edb3359d | 1743 | return frame_unwind_pc (frame->next); |
4c1e7e9d AC |
1744 | } |
1745 | ||
ad1193e7 | 1746 | /* Return an address that falls within THIS_FRAME's code block. */ |
8edd5d01 AC |
1747 | |
1748 | CORE_ADDR | |
ad1193e7 | 1749 | get_frame_address_in_block (struct frame_info *this_frame) |
8edd5d01 AC |
1750 | { |
1751 | /* A draft address. */ | |
ad1193e7 | 1752 | CORE_ADDR pc = get_frame_pc (this_frame); |
8edd5d01 | 1753 | |
ad1193e7 DJ |
1754 | struct frame_info *next_frame = this_frame->next; |
1755 | ||
1756 | /* Calling get_frame_pc returns the resume address for THIS_FRAME. | |
1757 | Normally the resume address is inside the body of the function | |
1758 | associated with THIS_FRAME, but there is a special case: when | |
1759 | calling a function which the compiler knows will never return | |
1760 | (for instance abort), the call may be the very last instruction | |
1761 | in the calling function. The resume address will point after the | |
1762 | call and may be at the beginning of a different function | |
1763 | entirely. | |
1764 | ||
1765 | If THIS_FRAME is a signal frame or dummy frame, then we should | |
1766 | not adjust the unwound PC. For a dummy frame, GDB pushed the | |
1767 | resume address manually onto the stack. For a signal frame, the | |
1768 | OS may have pushed the resume address manually and invoked the | |
1769 | handler (e.g. GNU/Linux), or invoked the trampoline which called | |
1770 | the signal handler - but in either case the signal handler is | |
1771 | expected to return to the trampoline. So in both of these | |
1772 | cases we know that the resume address is executable and | |
1773 | related. So we only need to adjust the PC if THIS_FRAME | |
1774 | is a normal function. | |
1775 | ||
1776 | If the program has been interrupted while THIS_FRAME is current, | |
1777 | then clearly the resume address is inside the associated | |
1778 | function. There are three kinds of interruption: debugger stop | |
1779 | (next frame will be SENTINEL_FRAME), operating system | |
1780 | signal or exception (next frame will be SIGTRAMP_FRAME), | |
1781 | or debugger-induced function call (next frame will be | |
1782 | DUMMY_FRAME). So we only need to adjust the PC if | |
1783 | NEXT_FRAME is a normal function. | |
1784 | ||
1785 | We check the type of NEXT_FRAME first, since it is already | |
1786 | known; frame type is determined by the unwinder, and since | |
1787 | we have THIS_FRAME we've already selected an unwinder for | |
edb3359d DJ |
1788 | NEXT_FRAME. |
1789 | ||
1790 | If the next frame is inlined, we need to keep going until we find | |
1791 | the real function - for instance, if a signal handler is invoked | |
1792 | while in an inlined function, then the code address of the | |
1793 | "calling" normal function should not be adjusted either. */ | |
1794 | ||
1795 | while (get_frame_type (next_frame) == INLINE_FRAME) | |
1796 | next_frame = next_frame->next; | |
1797 | ||
ad1193e7 | 1798 | if (get_frame_type (next_frame) == NORMAL_FRAME |
edb3359d DJ |
1799 | && (get_frame_type (this_frame) == NORMAL_FRAME |
1800 | || get_frame_type (this_frame) == INLINE_FRAME)) | |
ad1193e7 DJ |
1801 | return pc - 1; |
1802 | ||
1803 | return pc; | |
8edd5d01 AC |
1804 | } |
1805 | ||
edb3359d DJ |
1806 | void |
1807 | find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal) | |
1058bca7 | 1808 | { |
edb3359d DJ |
1809 | struct frame_info *next_frame; |
1810 | int notcurrent; | |
1811 | ||
1812 | /* If the next frame represents an inlined function call, this frame's | |
1813 | sal is the "call site" of that inlined function, which can not | |
1814 | be inferred from get_frame_pc. */ | |
1815 | next_frame = get_next_frame (frame); | |
1816 | if (frame_inlined_callees (frame) > 0) | |
1817 | { | |
1818 | struct symbol *sym; | |
1819 | ||
1820 | if (next_frame) | |
1821 | sym = get_frame_function (next_frame); | |
1822 | else | |
1823 | sym = inline_skipped_symbol (inferior_ptid); | |
1824 | ||
1825 | init_sal (sal); | |
1826 | if (SYMBOL_LINE (sym) != 0) | |
1827 | { | |
1828 | sal->symtab = SYMBOL_SYMTAB (sym); | |
1829 | sal->line = SYMBOL_LINE (sym); | |
1830 | } | |
1831 | else | |
1832 | /* If the symbol does not have a location, we don't know where | |
1833 | the call site is. Do not pretend to. This is jarring, but | |
1834 | we can't do much better. */ | |
1835 | sal->pc = get_frame_pc (frame); | |
1836 | ||
1837 | return; | |
1838 | } | |
1839 | ||
1058bca7 AC |
1840 | /* If FRAME is not the innermost frame, that normally means that |
1841 | FRAME->pc points at the return instruction (which is *after* the | |
1842 | call instruction), and we want to get the line containing the | |
1843 | call (because the call is where the user thinks the program is). | |
1844 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
1845 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
1846 | PC and such a PC indicates the current (rather than next) | |
1847 | instruction/line, consequently, for such cases, want to get the | |
1848 | line containing fi->pc. */ | |
edb3359d DJ |
1849 | notcurrent = (get_frame_pc (frame) != get_frame_address_in_block (frame)); |
1850 | (*sal) = find_pc_line (get_frame_pc (frame), notcurrent); | |
1058bca7 AC |
1851 | } |
1852 | ||
c193f6ac AC |
1853 | /* Per "frame.h", return the ``address'' of the frame. Code should |
1854 | really be using get_frame_id(). */ | |
1855 | CORE_ADDR | |
1856 | get_frame_base (struct frame_info *fi) | |
1857 | { | |
d0a55772 | 1858 | return get_frame_id (fi).stack_addr; |
c193f6ac AC |
1859 | } |
1860 | ||
da62e633 AC |
1861 | /* High-level offsets into the frame. Used by the debug info. */ |
1862 | ||
1863 | CORE_ADDR | |
1864 | get_frame_base_address (struct frame_info *fi) | |
1865 | { | |
7df05f2b | 1866 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
1867 | return 0; |
1868 | if (fi->base == NULL) | |
86c31399 | 1869 | fi->base = frame_base_find_by_frame (fi); |
da62e633 AC |
1870 | /* Sneaky: If the low-level unwind and high-level base code share a |
1871 | common unwinder, let them share the prologue cache. */ | |
1872 | if (fi->base->unwind == fi->unwind) | |
669fac23 DJ |
1873 | return fi->base->this_base (fi, &fi->prologue_cache); |
1874 | return fi->base->this_base (fi, &fi->base_cache); | |
da62e633 AC |
1875 | } |
1876 | ||
1877 | CORE_ADDR | |
1878 | get_frame_locals_address (struct frame_info *fi) | |
1879 | { | |
1880 | void **cache; | |
7df05f2b | 1881 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
1882 | return 0; |
1883 | /* If there isn't a frame address method, find it. */ | |
1884 | if (fi->base == NULL) | |
86c31399 | 1885 | fi->base = frame_base_find_by_frame (fi); |
da62e633 AC |
1886 | /* Sneaky: If the low-level unwind and high-level base code share a |
1887 | common unwinder, let them share the prologue cache. */ | |
1888 | if (fi->base->unwind == fi->unwind) | |
669fac23 DJ |
1889 | return fi->base->this_locals (fi, &fi->prologue_cache); |
1890 | return fi->base->this_locals (fi, &fi->base_cache); | |
da62e633 AC |
1891 | } |
1892 | ||
1893 | CORE_ADDR | |
1894 | get_frame_args_address (struct frame_info *fi) | |
1895 | { | |
1896 | void **cache; | |
7df05f2b | 1897 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
1898 | return 0; |
1899 | /* If there isn't a frame address method, find it. */ | |
1900 | if (fi->base == NULL) | |
86c31399 | 1901 | fi->base = frame_base_find_by_frame (fi); |
da62e633 AC |
1902 | /* Sneaky: If the low-level unwind and high-level base code share a |
1903 | common unwinder, let them share the prologue cache. */ | |
1904 | if (fi->base->unwind == fi->unwind) | |
669fac23 DJ |
1905 | return fi->base->this_args (fi, &fi->prologue_cache); |
1906 | return fi->base->this_args (fi, &fi->base_cache); | |
da62e633 AC |
1907 | } |
1908 | ||
e7802207 TT |
1909 | /* Return true if the frame unwinder for frame FI is UNWINDER; false |
1910 | otherwise. */ | |
1911 | ||
1912 | int | |
1913 | frame_unwinder_is (struct frame_info *fi, const struct frame_unwind *unwinder) | |
1914 | { | |
1915 | if (fi->unwind == NULL) | |
1916 | fi->unwind = frame_unwind_find_by_frame (fi, &fi->prologue_cache); | |
1917 | return fi->unwind == unwinder; | |
1918 | } | |
1919 | ||
85cf597a AC |
1920 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
1921 | or -1 for a NULL frame. */ | |
1922 | ||
1923 | int | |
1924 | frame_relative_level (struct frame_info *fi) | |
1925 | { | |
1926 | if (fi == NULL) | |
1927 | return -1; | |
1928 | else | |
1929 | return fi->level; | |
1930 | } | |
1931 | ||
5a203e44 AC |
1932 | enum frame_type |
1933 | get_frame_type (struct frame_info *frame) | |
1934 | { | |
c1bf6f65 AC |
1935 | if (frame->unwind == NULL) |
1936 | /* Initialize the frame's unwinder because that's what | |
1937 | provides the frame's type. */ | |
669fac23 | 1938 | frame->unwind = frame_unwind_find_by_frame (frame, &frame->prologue_cache); |
c1bf6f65 | 1939 | return frame->unwind->type; |
5a203e44 AC |
1940 | } |
1941 | ||
ae1e7417 AC |
1942 | /* Memory access methods. */ |
1943 | ||
1944 | void | |
10c42a71 AC |
1945 | get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, |
1946 | gdb_byte *buf, int len) | |
ae1e7417 AC |
1947 | { |
1948 | read_memory (addr, buf, len); | |
1949 | } | |
1950 | ||
1951 | LONGEST | |
1952 | get_frame_memory_signed (struct frame_info *this_frame, CORE_ADDR addr, | |
1953 | int len) | |
1954 | { | |
e17a4113 UW |
1955 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
1956 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1957 | return read_memory_integer (addr, len, byte_order); | |
ae1e7417 AC |
1958 | } |
1959 | ||
1960 | ULONGEST | |
1961 | get_frame_memory_unsigned (struct frame_info *this_frame, CORE_ADDR addr, | |
1962 | int len) | |
1963 | { | |
e17a4113 UW |
1964 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
1965 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1966 | return read_memory_unsigned_integer (addr, len, byte_order); | |
ae1e7417 AC |
1967 | } |
1968 | ||
304396fb AC |
1969 | int |
1970 | safe_frame_unwind_memory (struct frame_info *this_frame, | |
10c42a71 | 1971 | CORE_ADDR addr, gdb_byte *buf, int len) |
304396fb | 1972 | { |
8defab1a DJ |
1973 | /* NOTE: target_read_memory returns zero on success! */ |
1974 | return !target_read_memory (addr, buf, len); | |
304396fb AC |
1975 | } |
1976 | ||
36f15f55 | 1977 | /* Architecture methods. */ |
ae1e7417 AC |
1978 | |
1979 | struct gdbarch * | |
1980 | get_frame_arch (struct frame_info *this_frame) | |
1981 | { | |
36f15f55 UW |
1982 | return frame_unwind_arch (this_frame->next); |
1983 | } | |
1984 | ||
1985 | struct gdbarch * | |
1986 | frame_unwind_arch (struct frame_info *next_frame) | |
1987 | { | |
1988 | if (!next_frame->prev_arch.p) | |
1989 | { | |
1990 | struct gdbarch *arch; | |
0701b271 | 1991 | |
36f15f55 UW |
1992 | if (next_frame->unwind == NULL) |
1993 | next_frame->unwind | |
1994 | = frame_unwind_find_by_frame (next_frame, | |
1995 | &next_frame->prologue_cache); | |
1996 | ||
1997 | if (next_frame->unwind->prev_arch != NULL) | |
1998 | arch = next_frame->unwind->prev_arch (next_frame, | |
1999 | &next_frame->prologue_cache); | |
2000 | else | |
2001 | arch = get_frame_arch (next_frame); | |
2002 | ||
2003 | next_frame->prev_arch.arch = arch; | |
2004 | next_frame->prev_arch.p = 1; | |
2005 | if (frame_debug) | |
2006 | fprintf_unfiltered (gdb_stdlog, | |
2007 | "{ frame_unwind_arch (next_frame=%d) -> %s }\n", | |
2008 | next_frame->level, | |
2009 | gdbarch_bfd_arch_info (arch)->printable_name); | |
2010 | } | |
2011 | ||
2012 | return next_frame->prev_arch.arch; | |
2013 | } | |
2014 | ||
2015 | struct gdbarch * | |
2016 | frame_unwind_caller_arch (struct frame_info *next_frame) | |
2017 | { | |
2018 | return frame_unwind_arch (skip_inlined_frames (next_frame)); | |
ae1e7417 AC |
2019 | } |
2020 | ||
a9e5fdc2 AC |
2021 | /* Stack pointer methods. */ |
2022 | ||
2023 | CORE_ADDR | |
2024 | get_frame_sp (struct frame_info *this_frame) | |
2025 | { | |
d56907c1 | 2026 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
bbde78fa | 2027 | /* Normality - an architecture that provides a way of obtaining any |
a9e5fdc2 | 2028 | frame inner-most address. */ |
b1bd0044 | 2029 | if (gdbarch_unwind_sp_p (gdbarch)) |
d56907c1 DJ |
2030 | /* NOTE drow/2008-06-28: gdbarch_unwind_sp could be converted to |
2031 | operate on THIS_FRAME now. */ | |
2032 | return gdbarch_unwind_sp (gdbarch, this_frame->next); | |
a9e5fdc2 | 2033 | /* Now things are really are grim. Hope that the value returned by |
3e8c568d | 2034 | the gdbarch_sp_regnum register is meaningful. */ |
b1bd0044 | 2035 | if (gdbarch_sp_regnum (gdbarch) >= 0) |
d56907c1 DJ |
2036 | return get_frame_register_unsigned (this_frame, |
2037 | gdbarch_sp_regnum (gdbarch)); | |
e2e0b3e5 | 2038 | internal_error (__FILE__, __LINE__, _("Missing unwind SP method")); |
a9e5fdc2 AC |
2039 | } |
2040 | ||
55feb689 DJ |
2041 | /* Return the reason why we can't unwind past FRAME. */ |
2042 | ||
2043 | enum unwind_stop_reason | |
2044 | get_frame_unwind_stop_reason (struct frame_info *frame) | |
2045 | { | |
2046 | /* If we haven't tried to unwind past this point yet, then assume | |
2047 | that unwinding would succeed. */ | |
2048 | if (frame->prev_p == 0) | |
2049 | return UNWIND_NO_REASON; | |
2050 | ||
2051 | /* Otherwise, we set a reason when we succeeded (or failed) to | |
2052 | unwind. */ | |
2053 | return frame->stop_reason; | |
2054 | } | |
2055 | ||
2056 | /* Return a string explaining REASON. */ | |
2057 | ||
2058 | const char * | |
2059 | frame_stop_reason_string (enum unwind_stop_reason reason) | |
2060 | { | |
2061 | switch (reason) | |
2062 | { | |
2063 | case UNWIND_NULL_ID: | |
2064 | return _("unwinder did not report frame ID"); | |
2065 | ||
2066 | case UNWIND_INNER_ID: | |
2067 | return _("previous frame inner to this frame (corrupt stack?)"); | |
2068 | ||
2069 | case UNWIND_SAME_ID: | |
2070 | return _("previous frame identical to this frame (corrupt stack?)"); | |
2071 | ||
e48af409 DJ |
2072 | case UNWIND_NO_SAVED_PC: |
2073 | return _("frame did not save the PC"); | |
2074 | ||
55feb689 DJ |
2075 | case UNWIND_NO_REASON: |
2076 | case UNWIND_FIRST_ERROR: | |
2077 | default: | |
2078 | internal_error (__FILE__, __LINE__, | |
2079 | "Invalid frame stop reason"); | |
2080 | } | |
2081 | } | |
2082 | ||
669fac23 DJ |
2083 | /* Clean up after a failed (wrong unwinder) attempt to unwind past |
2084 | FRAME. */ | |
2085 | ||
2086 | static void | |
2087 | frame_cleanup_after_sniffer (void *arg) | |
2088 | { | |
2089 | struct frame_info *frame = arg; | |
2090 | ||
2091 | /* The sniffer should not allocate a prologue cache if it did not | |
2092 | match this frame. */ | |
2093 | gdb_assert (frame->prologue_cache == NULL); | |
2094 | ||
2095 | /* No sniffer should extend the frame chain; sniff based on what is | |
2096 | already certain. */ | |
2097 | gdb_assert (!frame->prev_p); | |
2098 | ||
2099 | /* The sniffer should not check the frame's ID; that's circular. */ | |
2100 | gdb_assert (!frame->this_id.p); | |
2101 | ||
2102 | /* Clear cached fields dependent on the unwinder. | |
2103 | ||
2104 | The previous PC is independent of the unwinder, but the previous | |
ad1193e7 | 2105 | function is not (see get_frame_address_in_block). */ |
669fac23 DJ |
2106 | frame->prev_func.p = 0; |
2107 | frame->prev_func.addr = 0; | |
2108 | ||
2109 | /* Discard the unwinder last, so that we can easily find it if an assertion | |
2110 | in this function triggers. */ | |
2111 | frame->unwind = NULL; | |
2112 | } | |
2113 | ||
2114 | /* Set FRAME's unwinder temporarily, so that we can call a sniffer. | |
2115 | Return a cleanup which should be called if unwinding fails, and | |
2116 | discarded if it succeeds. */ | |
2117 | ||
2118 | struct cleanup * | |
2119 | frame_prepare_for_sniffer (struct frame_info *frame, | |
2120 | const struct frame_unwind *unwind) | |
2121 | { | |
2122 | gdb_assert (frame->unwind == NULL); | |
2123 | frame->unwind = unwind; | |
2124 | return make_cleanup (frame_cleanup_after_sniffer, frame); | |
2125 | } | |
2126 | ||
b9362cc7 AC |
2127 | extern initialize_file_ftype _initialize_frame; /* -Wmissing-prototypes */ |
2128 | ||
25d29d70 AC |
2129 | static struct cmd_list_element *set_backtrace_cmdlist; |
2130 | static struct cmd_list_element *show_backtrace_cmdlist; | |
2131 | ||
2132 | static void | |
2133 | set_backtrace_cmd (char *args, int from_tty) | |
2134 | { | |
2135 | help_list (set_backtrace_cmdlist, "set backtrace ", -1, gdb_stdout); | |
2136 | } | |
2137 | ||
2138 | static void | |
2139 | show_backtrace_cmd (char *args, int from_tty) | |
2140 | { | |
2141 | cmd_show_list (show_backtrace_cmdlist, from_tty, ""); | |
2142 | } | |
2143 | ||
4c1e7e9d AC |
2144 | void |
2145 | _initialize_frame (void) | |
2146 | { | |
2147 | obstack_init (&frame_cache_obstack); | |
eb4f72c5 | 2148 | |
f4c5303c OF |
2149 | observer_attach_target_changed (frame_observer_target_changed); |
2150 | ||
1bedd215 | 2151 | add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, _("\ |
25d29d70 | 2152 | Set backtrace specific variables.\n\ |
1bedd215 | 2153 | Configure backtrace variables such as the backtrace limit"), |
25d29d70 AC |
2154 | &set_backtrace_cmdlist, "set backtrace ", |
2155 | 0/*allow-unknown*/, &setlist); | |
1bedd215 | 2156 | add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, _("\ |
25d29d70 | 2157 | Show backtrace specific variables\n\ |
1bedd215 | 2158 | Show backtrace variables such as the backtrace limit"), |
25d29d70 AC |
2159 | &show_backtrace_cmdlist, "show backtrace ", |
2160 | 0/*allow-unknown*/, &showlist); | |
2161 | ||
2162 | add_setshow_boolean_cmd ("past-main", class_obscure, | |
7915a72c AC |
2163 | &backtrace_past_main, _("\ |
2164 | Set whether backtraces should continue past \"main\"."), _("\ | |
2165 | Show whether backtraces should continue past \"main\"."), _("\ | |
eb4f72c5 AC |
2166 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ |
2167 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
7915a72c | 2168 | of the stack trace."), |
2c5b56ce | 2169 | NULL, |
920d2a44 | 2170 | show_backtrace_past_main, |
2c5b56ce | 2171 | &set_backtrace_cmdlist, |
25d29d70 AC |
2172 | &show_backtrace_cmdlist); |
2173 | ||
2315ffec | 2174 | add_setshow_boolean_cmd ("past-entry", class_obscure, |
7915a72c AC |
2175 | &backtrace_past_entry, _("\ |
2176 | Set whether backtraces should continue past the entry point of a program."), | |
2177 | _("\ | |
2178 | Show whether backtraces should continue past the entry point of a program."), | |
2179 | _("\ | |
2315ffec RC |
2180 | Normally there are no callers beyond the entry point of a program, so GDB\n\ |
2181 | will terminate the backtrace there. Set this variable if you need to see \n\ | |
7915a72c | 2182 | the rest of the stack trace."), |
2c5b56ce | 2183 | NULL, |
920d2a44 | 2184 | show_backtrace_past_entry, |
2c5b56ce | 2185 | &set_backtrace_cmdlist, |
2315ffec RC |
2186 | &show_backtrace_cmdlist); |
2187 | ||
4a5e53e8 DJ |
2188 | add_setshow_integer_cmd ("limit", class_obscure, |
2189 | &backtrace_limit, _("\ | |
7915a72c AC |
2190 | Set an upper bound on the number of backtrace levels."), _("\ |
2191 | Show the upper bound on the number of backtrace levels."), _("\ | |
fec74868 | 2192 | No more than the specified number of frames can be displayed or examined.\n\ |
7915a72c | 2193 | Zero is unlimited."), |
4a5e53e8 DJ |
2194 | NULL, |
2195 | show_backtrace_limit, | |
2196 | &set_backtrace_cmdlist, | |
2197 | &show_backtrace_cmdlist); | |
ac2bd0a9 AC |
2198 | |
2199 | /* Debug this files internals. */ | |
85c07804 AC |
2200 | add_setshow_zinteger_cmd ("frame", class_maintenance, &frame_debug, _("\ |
2201 | Set frame debugging."), _("\ | |
2202 | Show frame debugging."), _("\ | |
2203 | When non-zero, frame specific internal debugging is enabled."), | |
2204 | NULL, | |
920d2a44 | 2205 | show_frame_debug, |
85c07804 | 2206 | &setdebuglist, &showdebuglist); |
4c1e7e9d | 2207 | } |