Commit | Line | Data |
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4f460812 | 1 | /* Cache and manage frames for GDB, the GNU debugger. |
96cb11df AC |
2 | |
3 | Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, | |
5bf00f29 | 4 | 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
d65fe839 AC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "target.h" | |
26 | #include "value.h" | |
39f77062 | 27 | #include "inferior.h" /* for inferior_ptid */ |
4e052eda | 28 | #include "regcache.h" |
4f460812 | 29 | #include "gdb_assert.h" |
e36180d7 | 30 | #include "gdb_string.h" |
eb8bc282 | 31 | #include "user-regs.h" |
4c1e7e9d AC |
32 | #include "gdb_obstack.h" |
33 | #include "dummy-frame.h" | |
a94dd1fd | 34 | #include "sentinel-frame.h" |
4c1e7e9d AC |
35 | #include "gdbcore.h" |
36 | #include "annotate.h" | |
6e7f8b9c | 37 | #include "language.h" |
494cca16 | 38 | #include "frame-unwind.h" |
da62e633 | 39 | #include "frame-base.h" |
eb4f72c5 AC |
40 | #include "command.h" |
41 | #include "gdbcmd.h" | |
42 | ||
bd013d54 AC |
43 | /* We keep a cache of stack frames, each of which is a "struct |
44 | frame_info". The innermost one gets allocated (in | |
45 | wait_for_inferior) each time the inferior stops; current_frame | |
46 | points to it. Additional frames get allocated (in get_prev_frame) | |
47 | as needed, and are chained through the next and prev fields. Any | |
48 | time that the frame cache becomes invalid (most notably when we | |
49 | execute something, but also if we change how we interpret the | |
50 | frames (e.g. "set heuristic-fence-post" in mips-tdep.c, or anything | |
51 | which reads new symbols)), we should call reinit_frame_cache. */ | |
52 | ||
53 | struct frame_info | |
54 | { | |
55 | /* Level of this frame. The inner-most (youngest) frame is at level | |
56 | 0. As you move towards the outer-most (oldest) frame, the level | |
57 | increases. This is a cached value. It could just as easily be | |
58 | computed by counting back from the selected frame to the inner | |
59 | most frame. */ | |
60 | /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be | |
61 | reserved to indicate a bogus frame - one that has been created | |
62 | just to keep GDB happy (GDB always needs a frame). For the | |
63 | moment leave this as speculation. */ | |
64 | int level; | |
65 | ||
66 | /* The frame's type. */ | |
67 | /* FIXME: cagney/2003-04-02: Should instead be returning | |
ce2826aa | 68 | ->unwind->type. Unfortunately, legacy code is still explicitly |
bd013d54 AC |
69 | setting the type using the method deprecated_set_frame_type. |
70 | Eliminate that method and this field can be eliminated. */ | |
71 | enum frame_type type; | |
72 | ||
73 | /* For each register, address of where it was saved on entry to the | |
74 | frame, or zero if it was not saved on entry to this frame. This | |
75 | includes special registers such as pc and fp saved in special | |
76 | ways in the stack frame. The SP_REGNUM is even more special, the | |
77 | address here is the sp for the previous frame, not the address | |
78 | where the sp was saved. */ | |
79 | /* Allocated by frame_saved_regs_zalloc () which is called / | |
80 | initialized by DEPRECATED_FRAME_INIT_SAVED_REGS(). */ | |
81 | CORE_ADDR *saved_regs; /*NUM_REGS + NUM_PSEUDO_REGS*/ | |
82 | ||
83 | /* Anything extra for this structure that may have been defined in | |
84 | the machine dependent files. */ | |
85 | /* Allocated by frame_extra_info_zalloc () which is called / | |
86 | initialized by DEPRECATED_INIT_EXTRA_FRAME_INFO */ | |
87 | struct frame_extra_info *extra_info; | |
88 | ||
bd013d54 AC |
89 | /* The frame's low-level unwinder and corresponding cache. The |
90 | low-level unwinder is responsible for unwinding register values | |
91 | for the previous frame. The low-level unwind methods are | |
92 | selected based on the presence, or otherwize, of register unwind | |
93 | information such as CFI. */ | |
94 | void *prologue_cache; | |
95 | const struct frame_unwind *unwind; | |
96 | ||
97 | /* Cached copy of the previous frame's resume address. */ | |
98 | struct { | |
99 | int p; | |
100 | CORE_ADDR value; | |
101 | } prev_pc; | |
102 | ||
103 | /* Cached copy of the previous frame's function address. */ | |
104 | struct | |
105 | { | |
106 | CORE_ADDR addr; | |
107 | int p; | |
108 | } prev_func; | |
109 | ||
110 | /* This frame's ID. */ | |
111 | struct | |
112 | { | |
113 | int p; | |
114 | struct frame_id value; | |
115 | } this_id; | |
116 | ||
117 | /* The frame's high-level base methods, and corresponding cache. | |
118 | The high level base methods are selected based on the frame's | |
119 | debug info. */ | |
120 | const struct frame_base *base; | |
121 | void *base_cache; | |
122 | ||
123 | /* Pointers to the next (down, inner, younger) and previous (up, | |
124 | outer, older) frame_info's in the frame cache. */ | |
125 | struct frame_info *next; /* down, inner, younger */ | |
126 | int prev_p; | |
127 | struct frame_info *prev; /* up, outer, older */ | |
128 | }; | |
129 | ||
ac2bd0a9 AC |
130 | /* Flag to control debugging. */ |
131 | ||
132 | static int frame_debug; | |
133 | ||
25d29d70 AC |
134 | /* Flag to indicate whether backtraces should stop at main et.al. */ |
135 | ||
136 | static int backtrace_past_main; | |
137 | static unsigned int backtrace_limit = UINT_MAX; | |
eb4f72c5 | 138 | |
d65fe839 | 139 | |
00905d52 | 140 | void |
7f78e237 AC |
141 | fprint_frame_id (struct ui_file *file, struct frame_id id) |
142 | { | |
48c66725 | 143 | fprintf_unfiltered (file, "{stack=0x%s,code=0x%s,special=0x%s}", |
7f78e237 | 144 | paddr_nz (id.stack_addr), |
48c66725 JJ |
145 | paddr_nz (id.code_addr), |
146 | paddr_nz (id.special_addr)); | |
7f78e237 AC |
147 | } |
148 | ||
149 | static void | |
150 | fprint_frame_type (struct ui_file *file, enum frame_type type) | |
151 | { | |
152 | switch (type) | |
153 | { | |
154 | case UNKNOWN_FRAME: | |
155 | fprintf_unfiltered (file, "UNKNOWN_FRAME"); | |
156 | return; | |
157 | case NORMAL_FRAME: | |
158 | fprintf_unfiltered (file, "NORMAL_FRAME"); | |
159 | return; | |
160 | case DUMMY_FRAME: | |
161 | fprintf_unfiltered (file, "DUMMY_FRAME"); | |
162 | return; | |
163 | case SIGTRAMP_FRAME: | |
164 | fprintf_unfiltered (file, "SIGTRAMP_FRAME"); | |
165 | return; | |
166 | default: | |
167 | fprintf_unfiltered (file, "<unknown type>"); | |
168 | return; | |
169 | }; | |
170 | } | |
171 | ||
172 | static void | |
173 | fprint_frame (struct ui_file *file, struct frame_info *fi) | |
174 | { | |
175 | if (fi == NULL) | |
176 | { | |
177 | fprintf_unfiltered (file, "<NULL frame>"); | |
178 | return; | |
179 | } | |
180 | fprintf_unfiltered (file, "{"); | |
181 | fprintf_unfiltered (file, "level=%d", fi->level); | |
182 | fprintf_unfiltered (file, ","); | |
183 | fprintf_unfiltered (file, "type="); | |
184 | fprint_frame_type (file, fi->type); | |
185 | fprintf_unfiltered (file, ","); | |
186 | fprintf_unfiltered (file, "unwind="); | |
187 | if (fi->unwind != NULL) | |
188 | gdb_print_host_address (fi->unwind, file); | |
189 | else | |
190 | fprintf_unfiltered (file, "<unknown>"); | |
191 | fprintf_unfiltered (file, ","); | |
192 | fprintf_unfiltered (file, "pc="); | |
193 | if (fi->next != NULL && fi->next->prev_pc.p) | |
194 | fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_pc.value)); | |
195 | else | |
196 | fprintf_unfiltered (file, "<unknown>"); | |
197 | fprintf_unfiltered (file, ","); | |
198 | fprintf_unfiltered (file, "id="); | |
199 | if (fi->this_id.p) | |
200 | fprint_frame_id (file, fi->this_id.value); | |
201 | else | |
202 | fprintf_unfiltered (file, "<unknown>"); | |
203 | fprintf_unfiltered (file, ","); | |
204 | fprintf_unfiltered (file, "func="); | |
205 | if (fi->next != NULL && fi->next->prev_func.p) | |
206 | fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_func.addr)); | |
207 | else | |
208 | fprintf_unfiltered (file, "<unknown>"); | |
209 | fprintf_unfiltered (file, "}"); | |
210 | } | |
211 | ||
7a424e99 | 212 | /* Return a frame uniq ID that can be used to, later, re-find the |
101dcfbe AC |
213 | frame. */ |
214 | ||
7a424e99 AC |
215 | struct frame_id |
216 | get_frame_id (struct frame_info *fi) | |
101dcfbe AC |
217 | { |
218 | if (fi == NULL) | |
219 | { | |
7a424e99 | 220 | return null_frame_id; |
101dcfbe | 221 | } |
d0a55772 | 222 | if (!fi->this_id.p) |
101dcfbe | 223 | { |
06c77151 | 224 | gdb_assert (!legacy_frame_p (current_gdbarch)); |
7f78e237 AC |
225 | if (frame_debug) |
226 | fprintf_unfiltered (gdb_stdlog, "{ get_frame_id (fi=%d) ", | |
227 | fi->level); | |
c50901fd AC |
228 | /* Find the unwinder. */ |
229 | if (fi->unwind == NULL) | |
230 | { | |
e8a89fe2 | 231 | fi->unwind = frame_unwind_find_by_frame (fi->next); |
c50901fd AC |
232 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
233 | type in the frame, the unwinder's type should be returned | |
ce2826aa | 234 | directly. Unfortunately, legacy code, called by |
c50901fd AC |
235 | legacy_get_prev_frame, explicitly set the frames type |
236 | using the method deprecated_set_frame_type(). */ | |
237 | gdb_assert (fi->unwind->type != UNKNOWN_FRAME); | |
238 | fi->type = fi->unwind->type; | |
239 | } | |
06c77151 | 240 | /* Find THIS frame's ID. */ |
d0a55772 AC |
241 | fi->unwind->this_id (fi->next, &fi->prologue_cache, &fi->this_id.value); |
242 | fi->this_id.p = 1; | |
7f78e237 AC |
243 | if (frame_debug) |
244 | { | |
245 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
246 | fprint_frame_id (gdb_stdlog, fi->this_id.value); | |
247 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
248 | } | |
101dcfbe | 249 | } |
18adea3f | 250 | return fi->this_id.value; |
101dcfbe AC |
251 | } |
252 | ||
7a424e99 AC |
253 | const struct frame_id null_frame_id; /* All zeros. */ |
254 | ||
255 | struct frame_id | |
48c66725 JJ |
256 | frame_id_build_special (CORE_ADDR stack_addr, CORE_ADDR code_addr, |
257 | CORE_ADDR special_addr) | |
7a424e99 AC |
258 | { |
259 | struct frame_id id; | |
d0a55772 AC |
260 | id.stack_addr = stack_addr; |
261 | id.code_addr = code_addr; | |
48c66725 | 262 | id.special_addr = special_addr; |
7a424e99 AC |
263 | return id; |
264 | } | |
265 | ||
48c66725 JJ |
266 | struct frame_id |
267 | frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr) | |
268 | { | |
269 | return frame_id_build_special (stack_addr, code_addr, 0); | |
270 | } | |
271 | ||
7a424e99 AC |
272 | int |
273 | frame_id_p (struct frame_id l) | |
274 | { | |
d0a55772 AC |
275 | int p; |
276 | /* The .code can be NULL but the .stack cannot. */ | |
277 | p = (l.stack_addr != 0); | |
7f78e237 AC |
278 | if (frame_debug) |
279 | { | |
280 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_p (l="); | |
281 | fprint_frame_id (gdb_stdlog, l); | |
282 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", p); | |
283 | } | |
d0a55772 | 284 | return p; |
7a424e99 AC |
285 | } |
286 | ||
287 | int | |
288 | frame_id_eq (struct frame_id l, struct frame_id r) | |
289 | { | |
d0a55772 AC |
290 | int eq; |
291 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
292 | /* Like a NaN, if either ID is invalid, the result is false. */ | |
293 | eq = 0; | |
294 | else if (l.stack_addr != r.stack_addr) | |
295 | /* If .stack addresses are different, the frames are different. */ | |
296 | eq = 0; | |
297 | else if (l.code_addr == 0 || r.code_addr == 0) | |
298 | /* A zero code addr is a wild card, always succeed. */ | |
299 | eq = 1; | |
48c66725 JJ |
300 | else if (l.code_addr != r.code_addr) |
301 | /* If .code addresses are different, the frames are different. */ | |
302 | eq = 0; | |
303 | else if (l.special_addr == 0 || r.special_addr == 0) | |
304 | /* A zero special addr is a wild card (or unused), always succeed. */ | |
305 | eq = 1; | |
306 | else if (l.special_addr == r.special_addr) | |
307 | /* Frames are equal. */ | |
d0a55772 AC |
308 | eq = 1; |
309 | else | |
4aa79dcc AC |
310 | /* No luck. */ |
311 | eq = 0; | |
7f78e237 AC |
312 | if (frame_debug) |
313 | { | |
314 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (l="); | |
315 | fprint_frame_id (gdb_stdlog, l); | |
316 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
317 | fprint_frame_id (gdb_stdlog, r); | |
318 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", eq); | |
319 | } | |
d0a55772 | 320 | return eq; |
7a424e99 AC |
321 | } |
322 | ||
323 | int | |
324 | frame_id_inner (struct frame_id l, struct frame_id r) | |
325 | { | |
d0a55772 AC |
326 | int inner; |
327 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
328 | /* Like NaN, any operation involving an invalid ID always fails. */ | |
329 | inner = 0; | |
330 | else | |
331 | /* Only return non-zero when strictly inner than. Note that, per | |
332 | comment in "frame.h", there is some fuzz here. Frameless | |
333 | functions are not strictly inner than (same .stack but | |
48c66725 | 334 | different .code and/or .special address). */ |
d0a55772 | 335 | inner = INNER_THAN (l.stack_addr, r.stack_addr); |
7f78e237 AC |
336 | if (frame_debug) |
337 | { | |
338 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_inner (l="); | |
339 | fprint_frame_id (gdb_stdlog, l); | |
340 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
341 | fprint_frame_id (gdb_stdlog, r); | |
342 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", inner); | |
343 | } | |
d0a55772 | 344 | return inner; |
7a424e99 AC |
345 | } |
346 | ||
101dcfbe AC |
347 | struct frame_info * |
348 | frame_find_by_id (struct frame_id id) | |
349 | { | |
350 | struct frame_info *frame; | |
351 | ||
352 | /* ZERO denotes the null frame, let the caller decide what to do | |
353 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 354 | if (!frame_id_p (id)) |
101dcfbe AC |
355 | return NULL; |
356 | ||
357 | for (frame = get_current_frame (); | |
358 | frame != NULL; | |
359 | frame = get_prev_frame (frame)) | |
360 | { | |
7a424e99 AC |
361 | struct frame_id this = get_frame_id (frame); |
362 | if (frame_id_eq (id, this)) | |
363 | /* An exact match. */ | |
364 | return frame; | |
365 | if (frame_id_inner (id, this)) | |
366 | /* Gone to far. */ | |
101dcfbe | 367 | return NULL; |
7a424e99 AC |
368 | /* Either, we're not yet gone far enough out along the frame |
369 | chain (inner(this,id), or we're comparing frameless functions | |
370 | (same .base, different .func, no test available). Struggle | |
371 | on until we've definitly gone to far. */ | |
101dcfbe AC |
372 | } |
373 | return NULL; | |
374 | } | |
375 | ||
f18c5a73 | 376 | CORE_ADDR |
12cc2063 | 377 | frame_pc_unwind (struct frame_info *this_frame) |
f18c5a73 | 378 | { |
d1340264 | 379 | if (!this_frame->prev_pc.p) |
f18c5a73 | 380 | { |
12cc2063 AC |
381 | CORE_ADDR pc; |
382 | if (gdbarch_unwind_pc_p (current_gdbarch)) | |
383 | { | |
384 | /* The right way. The `pure' way. The one true way. This | |
385 | method depends solely on the register-unwind code to | |
386 | determine the value of registers in THIS frame, and hence | |
387 | the value of this frame's PC (resume address). A typical | |
388 | implementation is no more than: | |
389 | ||
390 | frame_unwind_register (this_frame, ISA_PC_REGNUM, buf); | |
af1342ab | 391 | return extract_unsigned_integer (buf, size of ISA_PC_REGNUM); |
12cc2063 AC |
392 | |
393 | Note: this method is very heavily dependent on a correct | |
394 | register-unwind implementation, it pays to fix that | |
395 | method first; this method is frame type agnostic, since | |
396 | it only deals with register values, it works with any | |
397 | frame. This is all in stark contrast to the old | |
398 | FRAME_SAVED_PC which would try to directly handle all the | |
399 | different ways that a PC could be unwound. */ | |
400 | pc = gdbarch_unwind_pc (current_gdbarch, this_frame); | |
401 | } | |
402 | else if (this_frame->level < 0) | |
403 | { | |
404 | /* FIXME: cagney/2003-03-06: Old code and and a sentinel | |
405 | frame. Do like was always done. Fetch the PC's value | |
406 | direct from the global registers array (via read_pc). | |
407 | This assumes that this frame belongs to the current | |
408 | global register cache. The assumption is dangerous. */ | |
409 | pc = read_pc (); | |
410 | } | |
8bedc050 | 411 | else if (DEPRECATED_FRAME_SAVED_PC_P ()) |
12cc2063 AC |
412 | { |
413 | /* FIXME: cagney/2003-03-06: Old code, but not a sentinel | |
414 | frame. Do like was always done. Note that this method, | |
415 | unlike unwind_pc(), tries to handle all the different | |
416 | frame cases directly. It fails. */ | |
8bedc050 | 417 | pc = DEPRECATED_FRAME_SAVED_PC (this_frame); |
12cc2063 AC |
418 | } |
419 | else | |
420 | internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method"); | |
d1340264 AC |
421 | this_frame->prev_pc.value = pc; |
422 | this_frame->prev_pc.p = 1; | |
7f78e237 AC |
423 | if (frame_debug) |
424 | fprintf_unfiltered (gdb_stdlog, | |
425 | "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n", | |
426 | this_frame->level, | |
427 | paddr_nz (this_frame->prev_pc.value)); | |
f18c5a73 | 428 | } |
d1340264 | 429 | return this_frame->prev_pc.value; |
f18c5a73 AC |
430 | } |
431 | ||
be41e9f4 AC |
432 | CORE_ADDR |
433 | frame_func_unwind (struct frame_info *fi) | |
434 | { | |
435 | if (!fi->prev_func.p) | |
436 | { | |
57bfe177 AC |
437 | /* Make certain that this, and not the adjacent, function is |
438 | found. */ | |
439 | CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi); | |
be41e9f4 | 440 | fi->prev_func.p = 1; |
57bfe177 | 441 | fi->prev_func.addr = get_pc_function_start (addr_in_block); |
7f78e237 AC |
442 | if (frame_debug) |
443 | fprintf_unfiltered (gdb_stdlog, | |
444 | "{ frame_func_unwind (fi=%d) -> 0x%s }\n", | |
445 | fi->level, paddr_nz (fi->prev_func.addr)); | |
be41e9f4 AC |
446 | } |
447 | return fi->prev_func.addr; | |
448 | } | |
449 | ||
450 | CORE_ADDR | |
451 | get_frame_func (struct frame_info *fi) | |
452 | { | |
453 | return frame_func_unwind (fi->next); | |
454 | } | |
455 | ||
7a25a7c1 AC |
456 | static int |
457 | do_frame_unwind_register (void *src, int regnum, void *buf) | |
458 | { | |
459 | frame_unwind_register (src, regnum, buf); | |
460 | return 1; | |
461 | } | |
462 | ||
dbe9fe58 | 463 | void |
7a25a7c1 AC |
464 | frame_pop (struct frame_info *this_frame) |
465 | { | |
466 | struct regcache *scratch_regcache; | |
467 | struct cleanup *cleanups; | |
468 | ||
749b82f6 | 469 | if (DEPRECATED_POP_FRAME_P ()) |
7a25a7c1 AC |
470 | { |
471 | /* A legacy architecture that has implemented a custom pop | |
472 | function. All new architectures should instead be using the | |
473 | generic code below. */ | |
749b82f6 | 474 | DEPRECATED_POP_FRAME; |
7a25a7c1 AC |
475 | } |
476 | else | |
477 | { | |
478 | /* Make a copy of all the register values unwound from this | |
479 | frame. Save them in a scratch buffer so that there isn't a | |
480 | race betweening trying to extract the old values from the | |
481 | current_regcache while, at the same time writing new values | |
482 | into that same cache. */ | |
483 | struct regcache *scratch = regcache_xmalloc (current_gdbarch); | |
484 | struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch); | |
485 | regcache_save (scratch, do_frame_unwind_register, this_frame); | |
efd710d6 AC |
486 | /* FIXME: cagney/2003-03-16: It should be possible to tell the |
487 | target's register cache that it is about to be hit with a | |
488 | burst register transfer and that the sequence of register | |
489 | writes should be batched. The pair target_prepare_to_store() | |
490 | and target_store_registers() kind of suggest this | |
ce2826aa | 491 | functionality. Unfortunately, they don't implement it. Their |
efd710d6 AC |
492 | lack of a formal definition can lead to targets writing back |
493 | bogus values (arguably a bug in the target code mind). */ | |
7a25a7c1 AC |
494 | /* Now copy those saved registers into the current regcache. |
495 | Here, regcache_cpy() calls regcache_restore(). */ | |
496 | regcache_cpy (current_regcache, scratch); | |
497 | do_cleanups (cleanups); | |
498 | } | |
499 | /* We've made right mess of GDB's local state, just discard | |
500 | everything. */ | |
dbe9fe58 AC |
501 | flush_cached_frames (); |
502 | } | |
c689142b | 503 | |
4f460812 AC |
504 | void |
505 | frame_register_unwind (struct frame_info *frame, int regnum, | |
506 | int *optimizedp, enum lval_type *lvalp, | |
507 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
508 | { | |
509 | struct frame_unwind_cache *cache; | |
510 | ||
7f78e237 AC |
511 | if (frame_debug) |
512 | { | |
513 | fprintf_unfiltered (gdb_stdlog, | |
514 | "{ frame_register_unwind (frame=%d,regnum=\"%s\",...) ", | |
eb8bc282 | 515 | frame->level, frame_map_regnum_to_name (frame, regnum)); |
7f78e237 AC |
516 | } |
517 | ||
4f460812 AC |
518 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates |
519 | that the value proper does not need to be fetched. */ | |
520 | gdb_assert (optimizedp != NULL); | |
521 | gdb_assert (lvalp != NULL); | |
522 | gdb_assert (addrp != NULL); | |
523 | gdb_assert (realnump != NULL); | |
524 | /* gdb_assert (bufferp != NULL); */ | |
525 | ||
a94dd1fd AC |
526 | /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame |
527 | is broken. There is always a frame. If there, for some reason, | |
528 | isn't, there is some pretty busted code as it should have | |
529 | detected the problem before calling here. */ | |
530 | gdb_assert (frame != NULL); | |
4f460812 | 531 | |
c50901fd AC |
532 | /* Find the unwinder. */ |
533 | if (frame->unwind == NULL) | |
534 | { | |
e8a89fe2 | 535 | frame->unwind = frame_unwind_find_by_frame (frame->next); |
c50901fd AC |
536 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
537 | type in the frame, the unwinder's type should be returned | |
ce2826aa | 538 | directly. Unfortunately, legacy code, called by |
c50901fd AC |
539 | legacy_get_prev_frame, explicitly set the frames type using |
540 | the method deprecated_set_frame_type(). */ | |
541 | gdb_assert (frame->unwind->type != UNKNOWN_FRAME); | |
542 | frame->type = frame->unwind->type; | |
543 | } | |
544 | ||
6dc42492 AC |
545 | /* Ask this frame to unwind its register. See comment in |
546 | "frame-unwind.h" for why NEXT frame and this unwind cace are | |
547 | passed in. */ | |
548 | frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum, | |
549 | optimizedp, lvalp, addrp, realnump, bufferp); | |
550 | ||
7f78e237 AC |
551 | if (frame_debug) |
552 | { | |
553 | fprintf_unfiltered (gdb_stdlog, "->"); | |
554 | fprintf_unfiltered (gdb_stdlog, " *optimizedp=%d", (*optimizedp)); | |
555 | fprintf_unfiltered (gdb_stdlog, " *lvalp=%d", (int) (*lvalp)); | |
556 | fprintf_unfiltered (gdb_stdlog, " *addrp=0x%s", paddr_nz ((*addrp))); | |
557 | fprintf_unfiltered (gdb_stdlog, " *bufferp="); | |
558 | if (bufferp == NULL) | |
559 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
560 | else | |
561 | { | |
562 | int i; | |
d2cf594a | 563 | const unsigned char *buf = bufferp; |
7f78e237 AC |
564 | fprintf_unfiltered (gdb_stdlog, "["); |
565 | for (i = 0; i < register_size (current_gdbarch, regnum); i++) | |
566 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); | |
567 | fprintf_unfiltered (gdb_stdlog, "]"); | |
568 | } | |
569 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
570 | } | |
4f460812 AC |
571 | } |
572 | ||
a216a322 AC |
573 | void |
574 | frame_register (struct frame_info *frame, int regnum, | |
575 | int *optimizedp, enum lval_type *lvalp, | |
576 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
577 | { | |
578 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates | |
579 | that the value proper does not need to be fetched. */ | |
580 | gdb_assert (optimizedp != NULL); | |
581 | gdb_assert (lvalp != NULL); | |
582 | gdb_assert (addrp != NULL); | |
583 | gdb_assert (realnump != NULL); | |
584 | /* gdb_assert (bufferp != NULL); */ | |
585 | ||
586 | /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset | |
587 | of the register in the register cache. It should instead return | |
588 | the REGNUM corresponding to that register. Translate the . */ | |
129c1cd6 | 589 | if (DEPRECATED_GET_SAVED_REGISTER_P ()) |
a216a322 | 590 | { |
129c1cd6 AC |
591 | DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame, |
592 | regnum, lvalp); | |
a216a322 AC |
593 | /* Compute the REALNUM if the caller wants it. */ |
594 | if (*lvalp == lval_register) | |
595 | { | |
596 | int regnum; | |
597 | for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++) | |
598 | { | |
599 | if (*addrp == register_offset_hack (current_gdbarch, regnum)) | |
600 | { | |
601 | *realnump = regnum; | |
602 | return; | |
603 | } | |
604 | } | |
605 | internal_error (__FILE__, __LINE__, | |
606 | "Failed to compute the register number corresponding" | |
607 | " to 0x%s", paddr_d (*addrp)); | |
608 | } | |
609 | *realnump = -1; | |
610 | return; | |
611 | } | |
612 | ||
a94dd1fd AC |
613 | /* Obtain the register value by unwinding the register from the next |
614 | (more inner frame). */ | |
615 | gdb_assert (frame != NULL && frame->next != NULL); | |
616 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
617 | realnump, bufferp); | |
a216a322 AC |
618 | } |
619 | ||
135c175f | 620 | void |
5b181d62 | 621 | frame_unwind_register (struct frame_info *frame, int regnum, void *buf) |
135c175f AC |
622 | { |
623 | int optimized; | |
624 | CORE_ADDR addr; | |
625 | int realnum; | |
626 | enum lval_type lval; | |
135c175f AC |
627 | frame_register_unwind (frame, regnum, &optimized, &lval, &addr, |
628 | &realnum, buf); | |
5b181d62 AC |
629 | } |
630 | ||
f0e7d0e8 AC |
631 | void |
632 | get_frame_register (struct frame_info *frame, | |
633 | int regnum, void *buf) | |
634 | { | |
635 | frame_unwind_register (frame->next, regnum, buf); | |
636 | } | |
637 | ||
638 | LONGEST | |
639 | frame_unwind_register_signed (struct frame_info *frame, int regnum) | |
640 | { | |
641 | char buf[MAX_REGISTER_SIZE]; | |
642 | frame_unwind_register (frame, regnum, buf); | |
f30992d4 | 643 | return extract_signed_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
f0e7d0e8 AC |
644 | } |
645 | ||
646 | LONGEST | |
647 | get_frame_register_signed (struct frame_info *frame, int regnum) | |
648 | { | |
649 | return frame_unwind_register_signed (frame->next, regnum); | |
650 | } | |
651 | ||
652 | ULONGEST | |
653 | frame_unwind_register_unsigned (struct frame_info *frame, int regnum) | |
654 | { | |
655 | char buf[MAX_REGISTER_SIZE]; | |
656 | frame_unwind_register (frame, regnum, buf); | |
f30992d4 | 657 | return extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
f0e7d0e8 AC |
658 | } |
659 | ||
660 | ULONGEST | |
661 | get_frame_register_unsigned (struct frame_info *frame, int regnum) | |
662 | { | |
663 | return frame_unwind_register_unsigned (frame->next, regnum); | |
664 | } | |
665 | ||
135c175f AC |
666 | void |
667 | frame_unwind_unsigned_register (struct frame_info *frame, int regnum, | |
668 | ULONGEST *val) | |
669 | { | |
d9d9c31f | 670 | char buf[MAX_REGISTER_SIZE]; |
5b181d62 | 671 | frame_unwind_register (frame, regnum, buf); |
f30992d4 | 672 | (*val) = extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
135c175f | 673 | } |
4f460812 | 674 | |
ff2e87ac AC |
675 | void |
676 | put_frame_register (struct frame_info *frame, int regnum, const void *buf) | |
677 | { | |
678 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
679 | int realnum; | |
680 | int optim; | |
681 | enum lval_type lval; | |
682 | CORE_ADDR addr; | |
683 | frame_register (frame, regnum, &optim, &lval, &addr, &realnum, NULL); | |
684 | if (optim) | |
685 | error ("Attempt to assign to a value that was optimized out."); | |
686 | switch (lval) | |
687 | { | |
688 | case lval_memory: | |
689 | { | |
690 | /* FIXME: write_memory doesn't yet take constant buffers. | |
691 | Arrrg! */ | |
692 | char tmp[MAX_REGISTER_SIZE]; | |
693 | memcpy (tmp, buf, register_size (gdbarch, regnum)); | |
694 | write_memory (addr, tmp, register_size (gdbarch, regnum)); | |
695 | break; | |
696 | } | |
697 | case lval_register: | |
698 | regcache_cooked_write (current_regcache, realnum, buf); | |
699 | break; | |
700 | default: | |
701 | error ("Attempt to assign to an unmodifiable value."); | |
702 | } | |
703 | } | |
704 | ||
cda5a58a | 705 | /* frame_register_read () |
d65fe839 | 706 | |
cda5a58a | 707 | Find and return the value of REGNUM for the specified stack frame. |
12c266ea AC |
708 | The number of bytes copied is DEPRECATED_REGISTER_RAW_SIZE |
709 | (REGNUM). | |
d65fe839 | 710 | |
cda5a58a | 711 | Returns 0 if the register value could not be found. */ |
d65fe839 | 712 | |
cda5a58a AC |
713 | int |
714 | frame_register_read (struct frame_info *frame, int regnum, void *myaddr) | |
d65fe839 | 715 | { |
a216a322 AC |
716 | int optimized; |
717 | enum lval_type lval; | |
718 | CORE_ADDR addr; | |
719 | int realnum; | |
720 | frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr); | |
d65fe839 | 721 | |
c97dcfc7 AC |
722 | /* FIXME: cagney/2002-05-15: This test, is just bogus. |
723 | ||
724 | It indicates that the target failed to supply a value for a | |
725 | register because it was "not available" at this time. Problem | |
726 | is, the target still has the register and so get saved_register() | |
727 | may be returning a value saved on the stack. */ | |
728 | ||
d65fe839 | 729 | if (register_cached (regnum) < 0) |
cda5a58a | 730 | return 0; /* register value not available */ |
d65fe839 | 731 | |
a216a322 | 732 | return !optimized; |
d65fe839 | 733 | } |
e36180d7 AC |
734 | |
735 | ||
736 | /* Map between a frame register number and its name. A frame register | |
737 | space is a superset of the cooked register space --- it also | |
738 | includes builtin registers. */ | |
739 | ||
740 | int | |
eb8bc282 | 741 | frame_map_name_to_regnum (struct frame_info *frame, const char *name, int len) |
e36180d7 | 742 | { |
eb8bc282 | 743 | return user_reg_map_name_to_regnum (get_frame_arch (frame), name, len); |
e36180d7 AC |
744 | } |
745 | ||
746 | const char * | |
eb8bc282 | 747 | frame_map_regnum_to_name (struct frame_info *frame, int regnum) |
e36180d7 | 748 | { |
eb8bc282 | 749 | return user_reg_map_regnum_to_name (get_frame_arch (frame), regnum); |
e36180d7 | 750 | } |
4c1e7e9d | 751 | |
a94dd1fd AC |
752 | /* Create a sentinel frame. */ |
753 | ||
b9362cc7 | 754 | static struct frame_info * |
a94dd1fd AC |
755 | create_sentinel_frame (struct regcache *regcache) |
756 | { | |
757 | struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
758 | frame->type = NORMAL_FRAME; | |
759 | frame->level = -1; | |
760 | /* Explicitly initialize the sentinel frame's cache. Provide it | |
761 | with the underlying regcache. In the future additional | |
762 | information, such as the frame's thread will be added. */ | |
6dc42492 | 763 | frame->prologue_cache = sentinel_frame_cache (regcache); |
a94dd1fd AC |
764 | /* For the moment there is only one sentinel frame implementation. */ |
765 | frame->unwind = sentinel_frame_unwind; | |
766 | /* Link this frame back to itself. The frame is self referential | |
767 | (the unwound PC is the same as the pc), so make it so. */ | |
768 | frame->next = frame; | |
50bbdbd9 AC |
769 | /* Make the sentinel frame's ID valid, but invalid. That way all |
770 | comparisons with it should fail. */ | |
d0a55772 AC |
771 | frame->this_id.p = 1; |
772 | frame->this_id.value = null_frame_id; | |
7f78e237 AC |
773 | if (frame_debug) |
774 | { | |
775 | fprintf_unfiltered (gdb_stdlog, "{ create_sentinel_frame (...) -> "); | |
776 | fprint_frame (gdb_stdlog, frame); | |
777 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
778 | } | |
a94dd1fd AC |
779 | return frame; |
780 | } | |
781 | ||
4c1e7e9d AC |
782 | /* Info about the innermost stack frame (contents of FP register) */ |
783 | ||
784 | static struct frame_info *current_frame; | |
785 | ||
786 | /* Cache for frame addresses already read by gdb. Valid only while | |
787 | inferior is stopped. Control variables for the frame cache should | |
788 | be local to this module. */ | |
789 | ||
790 | static struct obstack frame_cache_obstack; | |
791 | ||
792 | void * | |
479ab5a0 | 793 | frame_obstack_zalloc (unsigned long size) |
4c1e7e9d | 794 | { |
479ab5a0 AC |
795 | void *data = obstack_alloc (&frame_cache_obstack, size); |
796 | memset (data, 0, size); | |
797 | return data; | |
4c1e7e9d AC |
798 | } |
799 | ||
6baff1d2 | 800 | CORE_ADDR * |
4c1e7e9d AC |
801 | frame_saved_regs_zalloc (struct frame_info *fi) |
802 | { | |
803 | fi->saved_regs = (CORE_ADDR *) | |
479ab5a0 | 804 | frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); |
6baff1d2 | 805 | return fi->saved_regs; |
4c1e7e9d AC |
806 | } |
807 | ||
6baff1d2 | 808 | CORE_ADDR * |
1b1d3794 | 809 | deprecated_get_frame_saved_regs (struct frame_info *fi) |
6baff1d2 AC |
810 | { |
811 | return fi->saved_regs; | |
812 | } | |
4c1e7e9d | 813 | |
a94dd1fd AC |
814 | /* Return the innermost (currently executing) stack frame. This is |
815 | split into two functions. The function unwind_to_current_frame() | |
816 | is wrapped in catch exceptions so that, even when the unwind of the | |
817 | sentinel frame fails, the function still returns a stack frame. */ | |
818 | ||
819 | static int | |
820 | unwind_to_current_frame (struct ui_out *ui_out, void *args) | |
821 | { | |
822 | struct frame_info *frame = get_prev_frame (args); | |
823 | /* A sentinel frame can fail to unwind, eg, because it's PC value | |
824 | lands in somewhere like start. */ | |
825 | if (frame == NULL) | |
826 | return 1; | |
827 | current_frame = frame; | |
828 | return 0; | |
829 | } | |
4c1e7e9d AC |
830 | |
831 | struct frame_info * | |
832 | get_current_frame (void) | |
833 | { | |
0a1e1ca1 AC |
834 | /* First check, and report, the lack of registers. Having GDB |
835 | report "No stack!" or "No memory" when the target doesn't even | |
836 | have registers is very confusing. Besides, "printcmd.exp" | |
837 | explicitly checks that ``print $pc'' with no registers prints "No | |
838 | registers". */ | |
a94dd1fd AC |
839 | if (!target_has_registers) |
840 | error ("No registers."); | |
0a1e1ca1 AC |
841 | if (!target_has_stack) |
842 | error ("No stack."); | |
a94dd1fd AC |
843 | if (!target_has_memory) |
844 | error ("No memory."); | |
4c1e7e9d AC |
845 | if (current_frame == NULL) |
846 | { | |
a94dd1fd AC |
847 | struct frame_info *sentinel_frame = |
848 | create_sentinel_frame (current_regcache); | |
849 | if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame, | |
850 | NULL, RETURN_MASK_ERROR) != 0) | |
851 | { | |
852 | /* Oops! Fake a current frame? Is this useful? It has a PC | |
853 | of zero, for instance. */ | |
854 | current_frame = sentinel_frame; | |
855 | } | |
4c1e7e9d AC |
856 | } |
857 | return current_frame; | |
858 | } | |
859 | ||
6e7f8b9c AC |
860 | /* The "selected" stack frame is used by default for local and arg |
861 | access. May be zero, for no selected frame. */ | |
862 | ||
863 | struct frame_info *deprecated_selected_frame; | |
864 | ||
865 | /* Return the selected frame. Always non-null (unless there isn't an | |
866 | inferior sufficient for creating a frame) in which case an error is | |
867 | thrown. */ | |
868 | ||
869 | struct frame_info * | |
870 | get_selected_frame (void) | |
871 | { | |
872 | if (deprecated_selected_frame == NULL) | |
873 | /* Hey! Don't trust this. It should really be re-finding the | |
874 | last selected frame of the currently selected thread. This, | |
875 | though, is better than nothing. */ | |
876 | select_frame (get_current_frame ()); | |
877 | /* There is always a frame. */ | |
878 | gdb_assert (deprecated_selected_frame != NULL); | |
879 | return deprecated_selected_frame; | |
880 | } | |
881 | ||
7dd88986 DJ |
882 | /* This is a variant of get_selected_frame which can be called when |
883 | the inferior does not have a frame; in that case it will return | |
884 | NULL instead of calling error (). */ | |
885 | ||
886 | struct frame_info * | |
887 | deprecated_safe_get_selected_frame (void) | |
888 | { | |
889 | if (!target_has_registers || !target_has_stack || !target_has_memory) | |
890 | return NULL; | |
891 | return get_selected_frame (); | |
892 | } | |
893 | ||
6e7f8b9c AC |
894 | /* Select frame FI (or NULL - to invalidate the current frame). */ |
895 | ||
896 | void | |
897 | select_frame (struct frame_info *fi) | |
898 | { | |
52f0bd74 | 899 | struct symtab *s; |
6e7f8b9c AC |
900 | |
901 | deprecated_selected_frame = fi; | |
902 | /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the | |
903 | frame is being invalidated. */ | |
904 | if (selected_frame_level_changed_hook) | |
905 | selected_frame_level_changed_hook (frame_relative_level (fi)); | |
906 | ||
907 | /* FIXME: kseitz/2002-08-28: It would be nice to call | |
908 | selected_frame_level_changed_event right here, but due to limitations | |
909 | in the current interfaces, we would end up flooding UIs with events | |
910 | because select_frame is used extensively internally. | |
911 | ||
912 | Once we have frame-parameterized frame (and frame-related) commands, | |
913 | the event notification can be moved here, since this function will only | |
914 | be called when the users selected frame is being changed. */ | |
915 | ||
916 | /* Ensure that symbols for this frame are read in. Also, determine the | |
917 | source language of this frame, and switch to it if desired. */ | |
918 | if (fi) | |
919 | { | |
7ae4c3a5 JB |
920 | /* We retrieve the frame's symtab by using the frame PC. However |
921 | we cannot use the frame pc as is, because it usually points to | |
922 | the instruction following the "call", which is sometimes the | |
923 | first instruction of another function. So we rely on | |
924 | get_frame_address_in_block() which provides us with a PC which | |
925 | is guaranteed to be inside the frame's code block. */ | |
926 | s = find_pc_symtab (get_frame_address_in_block (fi)); | |
6e7f8b9c AC |
927 | if (s |
928 | && s->language != current_language->la_language | |
929 | && s->language != language_unknown | |
930 | && language_mode == language_mode_auto) | |
931 | { | |
932 | set_language (s->language); | |
933 | } | |
934 | } | |
935 | } | |
936 | ||
4c1e7e9d AC |
937 | /* Return the register saved in the simplistic ``saved_regs'' cache. |
938 | If the value isn't here AND a value is needed, try the next inner | |
939 | most frame. */ | |
940 | ||
941 | static void | |
6dc42492 AC |
942 | legacy_saved_regs_prev_register (struct frame_info *next_frame, |
943 | void **this_prologue_cache, | |
944 | int regnum, int *optimizedp, | |
945 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
946 | int *realnump, void *bufferp) | |
4c1e7e9d | 947 | { |
6dc42492 | 948 | /* HACK: New code is passed the next frame and this cache. |
ce2826aa | 949 | Unfortunately, old code expects this frame. Since this is a |
6dc42492 AC |
950 | backward compatibility hack, cheat by walking one level along the |
951 | prologue chain to the frame the old code expects. | |
952 | ||
953 | Do not try this at home. Professional driver, closed course. */ | |
954 | struct frame_info *frame = next_frame->prev; | |
4c1e7e9d | 955 | gdb_assert (frame != NULL); |
4c1e7e9d | 956 | |
1b1d3794 | 957 | if (deprecated_get_frame_saved_regs (frame) == NULL) |
870b3035 AC |
958 | { |
959 | /* If nothing's initialized the saved regs, do it now. */ | |
960 | gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()); | |
961 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); | |
1b1d3794 | 962 | gdb_assert (deprecated_get_frame_saved_regs (frame) != NULL); |
870b3035 | 963 | } |
4c1e7e9d | 964 | |
1b1d3794 AC |
965 | if (deprecated_get_frame_saved_regs (frame) != NULL |
966 | && deprecated_get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d AC |
967 | { |
968 | if (regnum == SP_REGNUM) | |
969 | { | |
970 | /* SP register treated specially. */ | |
971 | *optimizedp = 0; | |
972 | *lvalp = not_lval; | |
973 | *addrp = 0; | |
974 | *realnump = -1; | |
975 | if (bufferp != NULL) | |
fbd9dcd3 AC |
976 | /* NOTE: cagney/2003-05-09: In-lined store_address with |
977 | it's body - store_unsigned_integer. */ | |
12c266ea | 978 | store_unsigned_integer (bufferp, DEPRECATED_REGISTER_RAW_SIZE (regnum), |
1b1d3794 | 979 | deprecated_get_frame_saved_regs (frame)[regnum]); |
4c1e7e9d AC |
980 | } |
981 | else | |
982 | { | |
983 | /* Any other register is saved in memory, fetch it but cache | |
984 | a local copy of its value. */ | |
985 | *optimizedp = 0; | |
986 | *lvalp = lval_memory; | |
1b1d3794 | 987 | *addrp = deprecated_get_frame_saved_regs (frame)[regnum]; |
4c1e7e9d AC |
988 | *realnump = -1; |
989 | if (bufferp != NULL) | |
990 | { | |
991 | #if 1 | |
992 | /* Save each register value, as it is read in, in a | |
993 | frame based cache. */ | |
6dc42492 | 994 | void **regs = (*this_prologue_cache); |
4c1e7e9d AC |
995 | if (regs == NULL) |
996 | { | |
997 | int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS) | |
998 | * sizeof (void *)); | |
479ab5a0 | 999 | regs = frame_obstack_zalloc (sizeof_cache); |
6dc42492 | 1000 | (*this_prologue_cache) = regs; |
4c1e7e9d AC |
1001 | } |
1002 | if (regs[regnum] == NULL) | |
1003 | { | |
1004 | regs[regnum] | |
12c266ea | 1005 | = frame_obstack_zalloc (DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
1b1d3794 | 1006 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], regs[regnum], |
12c266ea | 1007 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d | 1008 | } |
12c266ea | 1009 | memcpy (bufferp, regs[regnum], DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
1010 | #else |
1011 | /* Read the value in from memory. */ | |
1b1d3794 | 1012 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], bufferp, |
12c266ea | 1013 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
1014 | #endif |
1015 | } | |
1016 | } | |
1017 | return; | |
1018 | } | |
1019 | ||
6dc42492 AC |
1020 | /* No luck. Assume this and the next frame have the same register |
1021 | value. Pass the unwind request down the frame chain to the next | |
1022 | frame. Hopefully that frame will find the register's location. */ | |
1023 | frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp, | |
1024 | realnump, bufferp); | |
4c1e7e9d AC |
1025 | } |
1026 | ||
c170fb60 | 1027 | static void |
6dc42492 AC |
1028 | legacy_saved_regs_this_id (struct frame_info *next_frame, |
1029 | void **this_prologue_cache, | |
1030 | struct frame_id *id) | |
c689142b | 1031 | { |
18adea3f AC |
1032 | /* legacy_get_prev_frame() always sets ->this_id.p, hence this is |
1033 | never needed. */ | |
1034 | internal_error (__FILE__, __LINE__, "legacy_saved_regs_this_id() called"); | |
c689142b AC |
1035 | } |
1036 | ||
6dc42492 | 1037 | const struct frame_unwind legacy_saved_regs_unwinder = { |
7df05f2b AC |
1038 | /* Not really. It gets overridden by legacy_get_prev_frame. */ |
1039 | UNKNOWN_FRAME, | |
6dc42492 AC |
1040 | legacy_saved_regs_this_id, |
1041 | legacy_saved_regs_prev_register | |
494cca16 | 1042 | }; |
6dc42492 | 1043 | const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder; |
494cca16 AC |
1044 | |
1045 | ||
ac2adee5 | 1046 | /* Function: deprecated_generic_get_saved_register |
4c1e7e9d | 1047 | Find register number REGNUM relative to FRAME and put its (raw, |
ac2adee5 | 1048 | target format) contents in *RAW_BUFFER. |
4c1e7e9d AC |
1049 | |
1050 | Set *OPTIMIZED if the variable was optimized out (and thus can't be | |
1051 | fetched). Note that this is never set to anything other than zero | |
1052 | in this implementation. | |
1053 | ||
1054 | Set *LVAL to lval_memory, lval_register, or not_lval, depending on | |
1055 | whether the value was fetched from memory, from a register, or in a | |
1056 | strange and non-modifiable way (e.g. a frame pointer which was | |
1057 | calculated rather than fetched). We will use not_lval for values | |
1058 | fetched from generic dummy frames. | |
1059 | ||
62700349 AC |
1060 | Set *ADDRP to the address, either in memory or as a |
1061 | DEPRECATED_REGISTER_BYTE offset into the registers array. If the | |
1062 | value is stored in a dummy frame, set *ADDRP to zero. | |
4c1e7e9d | 1063 | |
4c1e7e9d AC |
1064 | The argument RAW_BUFFER must point to aligned memory. */ |
1065 | ||
1066 | void | |
1067 | deprecated_generic_get_saved_register (char *raw_buffer, int *optimized, | |
1068 | CORE_ADDR *addrp, | |
1069 | struct frame_info *frame, int regnum, | |
1070 | enum lval_type *lval) | |
1071 | { | |
1072 | if (!target_has_registers) | |
1073 | error ("No registers."); | |
1074 | ||
1075 | /* Normal systems don't optimize out things with register numbers. */ | |
1076 | if (optimized != NULL) | |
1077 | *optimized = 0; | |
1078 | ||
1079 | if (addrp) /* default assumption: not found in memory */ | |
1080 | *addrp = 0; | |
1081 | ||
1082 | /* Note: since the current frame's registers could only have been | |
1083 | saved by frames INTERIOR TO the current frame, we skip examining | |
1084 | the current frame itself: otherwise, we would be getting the | |
1085 | previous frame's registers which were saved by the current frame. */ | |
1086 | ||
a94dd1fd | 1087 | if (frame != NULL) |
4c1e7e9d | 1088 | { |
a94dd1fd AC |
1089 | for (frame = get_next_frame (frame); |
1090 | frame_relative_level (frame) >= 0; | |
1091 | frame = get_next_frame (frame)) | |
4c1e7e9d | 1092 | { |
a94dd1fd | 1093 | if (get_frame_type (frame) == DUMMY_FRAME) |
4c1e7e9d | 1094 | { |
a94dd1fd AC |
1095 | if (lval) /* found it in a CALL_DUMMY frame */ |
1096 | *lval = not_lval; | |
1097 | if (raw_buffer) | |
1098 | /* FIXME: cagney/2002-06-26: This should be via the | |
1099 | gdbarch_register_read() method so that it, on the | |
1100 | fly, constructs either a raw or pseudo register | |
1101 | from the raw register cache. */ | |
1102 | regcache_raw_read | |
cc8c88f3 AC |
1103 | (deprecated_find_dummy_frame_regcache (get_frame_pc (frame), |
1104 | get_frame_base (frame)), | |
a94dd1fd AC |
1105 | regnum, raw_buffer); |
1106 | return; | |
4c1e7e9d | 1107 | } |
a94dd1fd | 1108 | |
f30ee0bc | 1109 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); |
1b1d3794 AC |
1110 | if (deprecated_get_frame_saved_regs (frame) != NULL |
1111 | && deprecated_get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d | 1112 | { |
a94dd1fd AC |
1113 | if (lval) /* found it saved on the stack */ |
1114 | *lval = lval_memory; | |
1115 | if (regnum == SP_REGNUM) | |
1116 | { | |
1117 | if (raw_buffer) /* SP register treated specially */ | |
fbd9dcd3 AC |
1118 | /* NOTE: cagney/2003-05-09: In-line store_address |
1119 | with it's body - store_unsigned_integer. */ | |
1120 | store_unsigned_integer (raw_buffer, | |
12c266ea | 1121 | DEPRECATED_REGISTER_RAW_SIZE (regnum), |
1b1d3794 | 1122 | deprecated_get_frame_saved_regs (frame)[regnum]); |
a94dd1fd AC |
1123 | } |
1124 | else | |
1125 | { | |
1126 | if (addrp) /* any other register */ | |
1b1d3794 | 1127 | *addrp = deprecated_get_frame_saved_regs (frame)[regnum]; |
a94dd1fd | 1128 | if (raw_buffer) |
1b1d3794 | 1129 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], raw_buffer, |
12c266ea | 1130 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
a94dd1fd AC |
1131 | } |
1132 | return; | |
4c1e7e9d | 1133 | } |
4c1e7e9d AC |
1134 | } |
1135 | } | |
1136 | ||
1137 | /* If we get thru the loop to this point, it means the register was | |
1138 | not saved in any frame. Return the actual live-register value. */ | |
1139 | ||
1140 | if (lval) /* found it in a live register */ | |
1141 | *lval = lval_register; | |
1142 | if (addrp) | |
62700349 | 1143 | *addrp = DEPRECATED_REGISTER_BYTE (regnum); |
4c1e7e9d AC |
1144 | if (raw_buffer) |
1145 | deprecated_read_register_gen (regnum, raw_buffer); | |
1146 | } | |
1147 | ||
eb4f72c5 AC |
1148 | /* Determine the frame's type based on its PC. */ |
1149 | ||
1150 | static enum frame_type | |
1151 | frame_type_from_pc (CORE_ADDR pc) | |
1152 | { | |
1153 | /* FIXME: cagney/2002-11-24: Can't yet directly call | |
1154 | pc_in_dummy_frame() as some architectures don't set | |
1155 | PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the | |
1156 | latter is implemented by simply calling pc_in_dummy_frame). */ | |
1157 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES | |
1158 | && DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) | |
1159 | return DUMMY_FRAME; | |
1160 | else | |
1161 | { | |
1162 | char *name; | |
1163 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1164 | if (PC_IN_SIGTRAMP (pc, name)) | |
1165 | return SIGTRAMP_FRAME; | |
1166 | else | |
1167 | return NORMAL_FRAME; | |
1168 | } | |
1169 | } | |
1170 | ||
4c1e7e9d AC |
1171 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. |
1172 | Always returns a non-NULL value. */ | |
1173 | ||
1174 | struct frame_info * | |
1175 | create_new_frame (CORE_ADDR addr, CORE_ADDR pc) | |
1176 | { | |
1177 | struct frame_info *fi; | |
4c1e7e9d | 1178 | |
7f78e237 AC |
1179 | if (frame_debug) |
1180 | { | |
1181 | fprintf_unfiltered (gdb_stdlog, | |
1182 | "{ create_new_frame (addr=0x%s, pc=0x%s) ", | |
1183 | paddr_nz (addr), paddr_nz (pc)); | |
1184 | } | |
1185 | ||
479ab5a0 | 1186 | fi = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d | 1187 | |
a94dd1fd | 1188 | fi->next = create_sentinel_frame (current_regcache); |
7df05f2b AC |
1189 | |
1190 | /* Select/initialize both the unwind function and the frame's type | |
1191 | based on the PC. */ | |
e8a89fe2 | 1192 | fi->unwind = frame_unwind_find_by_frame (fi->next); |
7df05f2b AC |
1193 | if (fi->unwind->type != UNKNOWN_FRAME) |
1194 | fi->type = fi->unwind->type; | |
1195 | else | |
1196 | fi->type = frame_type_from_pc (pc); | |
1197 | ||
18adea3f | 1198 | fi->this_id.p = 1; |
11889732 AC |
1199 | deprecated_update_frame_base_hack (fi, addr); |
1200 | deprecated_update_frame_pc_hack (fi, pc); | |
4c1e7e9d | 1201 | |
e9582e71 AC |
1202 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1203 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi); | |
4c1e7e9d | 1204 | |
7f78e237 AC |
1205 | if (frame_debug) |
1206 | { | |
1207 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1208 | fprint_frame (gdb_stdlog, fi); | |
1209 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1210 | } | |
1211 | ||
4c1e7e9d AC |
1212 | return fi; |
1213 | } | |
1214 | ||
03febf99 AC |
1215 | /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the |
1216 | innermost frame). Be careful to not fall off the bottom of the | |
1217 | frame chain and onto the sentinel frame. */ | |
4c1e7e9d AC |
1218 | |
1219 | struct frame_info * | |
03febf99 | 1220 | get_next_frame (struct frame_info *this_frame) |
4c1e7e9d | 1221 | { |
03febf99 AC |
1222 | if (this_frame->level > 0) |
1223 | return this_frame->next; | |
a94dd1fd AC |
1224 | else |
1225 | return NULL; | |
4c1e7e9d AC |
1226 | } |
1227 | ||
870b3035 AC |
1228 | struct frame_info * |
1229 | deprecated_get_next_frame_hack (struct frame_info *this_frame) | |
1230 | { | |
1231 | return this_frame->next; | |
1232 | } | |
1233 | ||
4c1e7e9d AC |
1234 | /* Flush the entire frame cache. */ |
1235 | ||
1236 | void | |
1237 | flush_cached_frames (void) | |
1238 | { | |
1239 | /* Since we can't really be sure what the first object allocated was */ | |
1240 | obstack_free (&frame_cache_obstack, 0); | |
1241 | obstack_init (&frame_cache_obstack); | |
1242 | ||
1243 | current_frame = NULL; /* Invalidate cache */ | |
1244 | select_frame (NULL); | |
1245 | annotate_frames_invalid (); | |
7f78e237 AC |
1246 | if (frame_debug) |
1247 | fprintf_unfiltered (gdb_stdlog, "{ flush_cached_frames () }\n"); | |
4c1e7e9d AC |
1248 | } |
1249 | ||
1250 | /* Flush the frame cache, and start a new one if necessary. */ | |
1251 | ||
1252 | void | |
1253 | reinit_frame_cache (void) | |
1254 | { | |
1255 | flush_cached_frames (); | |
1256 | ||
1257 | /* FIXME: The inferior_ptid test is wrong if there is a corefile. */ | |
1258 | if (PIDGET (inferior_ptid) != 0) | |
1259 | { | |
1260 | select_frame (get_current_frame ()); | |
1261 | } | |
1262 | } | |
1263 | ||
eb4f72c5 AC |
1264 | /* Create the previous frame using the deprecated methods |
1265 | INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */ | |
4c1e7e9d | 1266 | |
eb4f72c5 | 1267 | static struct frame_info * |
03febf99 | 1268 | legacy_get_prev_frame (struct frame_info *this_frame) |
4c1e7e9d AC |
1269 | { |
1270 | CORE_ADDR address = 0; | |
1271 | struct frame_info *prev; | |
95adb866 | 1272 | int fromleaf; |
4c1e7e9d | 1273 | |
7f78e237 AC |
1274 | /* Don't frame_debug print legacy_get_prev_frame() here, just |
1275 | confuses the output. */ | |
1276 | ||
a01dd7cc | 1277 | /* Allocate the new frame. |
055bb976 AC |
1278 | |
1279 | There is no reason to worry about memory leaks, should the | |
1280 | remainder of the function fail. The allocated memory will be | |
1281 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1282 | been here before' check, in get_prev_frame will stop repeated | |
1283 | memory allocation calls. */ | |
1284 | prev = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
1285 | prev->level = this_frame->level + 1; | |
1286 | ||
a01dd7cc AC |
1287 | /* Do not completly wire it in to the frame chain. Some (bad) code |
1288 | in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull | |
1289 | some fancy tricks (of course such code is, by definition, | |
1290 | recursive). | |
1291 | ||
1292 | On the other hand, methods, such as get_frame_pc() and | |
1293 | get_frame_base() rely on being able to walk along the frame | |
1294 | chain. Make certain that at least they work by providing that | |
1295 | link. Of course things manipulating prev can't go back. */ | |
1296 | prev->next = this_frame; | |
1297 | ||
055bb976 AC |
1298 | /* NOTE: cagney/2002-11-18: Should have been correctly setting the |
1299 | frame's type here, before anything else, and not last, at the | |
1300 | bottom of this function. The various | |
1301 | DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC, | |
1302 | DEPRECATED_INIT_FRAME_PC_FIRST and | |
1303 | DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds | |
1304 | that handle the frame not being correctly set from the start. | |
ce2826aa | 1305 | Unfortunately those same work-arounds rely on the type defaulting |
055bb976 AC |
1306 | to NORMAL_FRAME. Ulgh! The new frame code does not have this |
1307 | problem. */ | |
7df05f2b | 1308 | prev->type = UNKNOWN_FRAME; |
055bb976 | 1309 | |
06c77151 | 1310 | /* A legacy frame's ID is always computed here. Mark it as valid. */ |
d0a55772 | 1311 | prev->this_id.p = 1; |
06c77151 | 1312 | |
055bb976 AC |
1313 | /* Handle sentinel frame unwind as a special case. */ |
1314 | if (this_frame->level < 0) | |
1315 | { | |
1316 | /* Try to unwind the PC. If that doesn't work, assume we've reached | |
1317 | the oldest frame and simply return. Is there a better sentinal | |
1318 | value? The unwound PC value is then used to initialize the new | |
1319 | previous frame's type. | |
1320 | ||
1321 | Note that the pc-unwind is intentionally performed before the | |
1322 | frame chain. This is ok since, for old targets, both | |
618ce49f AC |
1323 | frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and |
1324 | DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures | |
1325 | have already been initialized (using | |
055bb976 AC |
1326 | DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order |
1327 | doesn't matter. | |
1328 | ||
1329 | By unwinding the PC first, it becomes possible to, in the case of | |
1330 | a dummy frame, avoid also unwinding the frame ID. This is | |
1331 | because (well ignoring the PPC) a dummy frame can be located | |
1332 | using THIS_FRAME's frame ID. */ | |
1333 | ||
11889732 AC |
1334 | deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame)); |
1335 | if (get_frame_pc (prev) == 0) | |
055bb976 AC |
1336 | { |
1337 | /* The allocated PREV_FRAME will be reclaimed when the frame | |
1338 | obstack is next purged. */ | |
1339 | if (frame_debug) | |
7f78e237 AC |
1340 | { |
1341 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1342 | fprint_frame (gdb_stdlog, NULL); | |
1343 | fprintf_unfiltered (gdb_stdlog, | |
1344 | " // unwound legacy PC zero }\n"); | |
1345 | } | |
055bb976 AC |
1346 | return NULL; |
1347 | } | |
055bb976 | 1348 | |
7df05f2b AC |
1349 | /* Set the unwind functions based on that identified PC. Ditto |
1350 | for the "type" but strongly prefer the unwinder's frame type. */ | |
e8a89fe2 | 1351 | prev->unwind = frame_unwind_find_by_frame (prev->next); |
7df05f2b | 1352 | if (prev->unwind->type == UNKNOWN_FRAME) |
d1340264 | 1353 | prev->type = frame_type_from_pc (get_frame_pc (prev)); |
7df05f2b AC |
1354 | else |
1355 | prev->type = prev->unwind->type; | |
055bb976 AC |
1356 | |
1357 | /* Find the prev's frame's ID. */ | |
1358 | if (prev->type == DUMMY_FRAME | |
1359 | && gdbarch_unwind_dummy_id_p (current_gdbarch)) | |
1360 | { | |
1361 | /* When unwinding a normal frame, the stack structure is | |
1362 | determined by analyzing the frame's function's code (be | |
1363 | it using brute force prologue analysis, or the dwarf2 | |
1364 | CFI). In the case of a dummy frame, that simply isn't | |
1365 | possible. The The PC is either the program entry point, | |
1366 | or some random address on the stack. Trying to use that | |
1367 | PC to apply standard frame ID unwind techniques is just | |
1368 | asking for trouble. */ | |
055bb976 AC |
1369 | /* Use an architecture specific method to extract the prev's |
1370 | dummy ID from the next frame. Note that this method uses | |
1371 | frame_register_unwind to obtain the register values | |
1372 | needed to determine the dummy frame's ID. */ | |
d0a55772 AC |
1373 | prev->this_id.value = gdbarch_unwind_dummy_id (current_gdbarch, |
1374 | this_frame); | |
055bb976 AC |
1375 | } |
1376 | else | |
1377 | { | |
1378 | /* We're unwinding a sentinel frame, the PC of which is | |
1379 | pointing at a stack dummy. Fake up the dummy frame's ID | |
1380 | using the same sequence as is found a traditional | |
1381 | unwinder. Once all architectures supply the | |
1382 | unwind_dummy_id method, this code can go away. */ | |
0ba6dca9 AC |
1383 | prev->this_id.value = frame_id_build (deprecated_read_fp (), |
1384 | read_pc ()); | |
055bb976 AC |
1385 | } |
1386 | ||
1387 | /* Check that the unwound ID is valid. */ | |
d0a55772 | 1388 | if (!frame_id_p (prev->this_id.value)) |
055bb976 AC |
1389 | { |
1390 | if (frame_debug) | |
7f78e237 AC |
1391 | { |
1392 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1393 | fprint_frame (gdb_stdlog, NULL); | |
1394 | fprintf_unfiltered (gdb_stdlog, | |
1395 | " // unwound legacy ID invalid }\n"); | |
1396 | } | |
055bb976 AC |
1397 | return NULL; |
1398 | } | |
1399 | ||
1400 | /* Check that the new frame isn't inner to (younger, below, | |
1401 | next) the old frame. If that happens the frame unwind is | |
1402 | going backwards. */ | |
1403 | /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since | |
1404 | that doesn't have a valid frame ID. Should instead set the | |
1405 | sentinel frame's frame ID to a `sentinel'. Leave it until | |
1406 | after the switch to storing the frame ID, instead of the | |
1407 | frame base, in the frame object. */ | |
1408 | ||
055bb976 AC |
1409 | /* Link it in. */ |
1410 | this_frame->prev = prev; | |
055bb976 AC |
1411 | |
1412 | /* FIXME: cagney/2002-01-19: This call will go away. Instead of | |
1413 | initializing extra info, all frames will use the frame_cache | |
1414 | (passed to the unwind functions) to store additional frame | |
ce2826aa | 1415 | info. Unfortunately legacy targets can't use |
055bb976 AC |
1416 | legacy_get_prev_frame() to unwind the sentinel frame and, |
1417 | consequently, are forced to take this code path and rely on | |
1418 | the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to | |
1419 | initialize the inner-most frame. */ | |
1420 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) | |
1421 | { | |
1422 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev); | |
1423 | } | |
18adea3f AC |
1424 | |
1425 | if (prev->type == NORMAL_FRAME) | |
1426 | prev->this_id.value.code_addr | |
1427 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1428 | ||
7f78e237 AC |
1429 | if (frame_debug) |
1430 | { | |
1431 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1432 | fprint_frame (gdb_stdlog, prev); | |
1433 | fprintf_unfiltered (gdb_stdlog, " } // legacy innermost frame\n"); | |
1434 | } | |
055bb976 AC |
1435 | return prev; |
1436 | } | |
1437 | ||
eb4f72c5 AC |
1438 | /* This code only works on normal frames. A sentinel frame, where |
1439 | the level is -1, should never reach this code. */ | |
03febf99 | 1440 | gdb_assert (this_frame->level >= 0); |
4c1e7e9d AC |
1441 | |
1442 | /* On some machines it is possible to call a function without | |
1443 | setting up a stack frame for it. On these machines, we | |
1444 | define this macro to take two args; a frameinfo pointer | |
1445 | identifying a frame and a variable to set or clear if it is | |
1446 | or isn't leafless. */ | |
1447 | ||
1448 | /* Still don't want to worry about this except on the innermost | |
03febf99 | 1449 | frame. This macro will set FROMLEAF if THIS_FRAME is a frameless |
95adb866 | 1450 | function invocation. */ |
03febf99 | 1451 | if (this_frame->level == 0) |
95adb866 AC |
1452 | /* FIXME: 2002-11-09: Frameless functions can occure anywhere in |
1453 | the frame chain, not just the inner most frame! The generic, | |
1454 | per-architecture, frame code should handle this and the below | |
1455 | should simply be removed. */ | |
03febf99 | 1456 | fromleaf = FRAMELESS_FUNCTION_INVOCATION (this_frame); |
95adb866 AC |
1457 | else |
1458 | fromleaf = 0; | |
1459 | ||
1460 | if (fromleaf) | |
1461 | /* A frameless inner-most frame. The `FP' (which isn't an | |
1462 | architecture frame-pointer register!) of the caller is the same | |
1463 | as the callee. */ | |
1464 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
1465 | edge condition. Instead the per-architecture code should hande | |
1466 | it locally. */ | |
870b3035 AC |
1467 | /* FIXME: cagney/2003-06-16: This returns the inner most stack |
1468 | address for the previous frame, that, however, is wrong. It | |
1469 | should be the inner most stack address for the previous to | |
1470 | previous frame. This is because it is the previous to previous | |
1471 | frame's innermost stack address that is constant through out | |
1472 | the lifetime of the previous frame (trust me :-). */ | |
03febf99 | 1473 | address = get_frame_base (this_frame); |
95adb866 | 1474 | else |
4c1e7e9d AC |
1475 | { |
1476 | /* Two macros defined in tm.h specify the machine-dependent | |
1477 | actions to be performed here. | |
95adb866 | 1478 | |
4c1e7e9d | 1479 | First, get the frame's chain-pointer. |
95adb866 | 1480 | |
4c1e7e9d AC |
1481 | If that is zero, the frame is the outermost frame or a leaf |
1482 | called by the outermost frame. This means that if start | |
1483 | calls main without a frame, we'll return 0 (which is fine | |
1484 | anyway). | |
1485 | ||
1486 | Nope; there's a problem. This also returns when the current | |
1487 | routine is a leaf of main. This is unacceptable. We move | |
1488 | this to after the ffi test; I'd rather have backtraces from | |
1489 | start go curfluy than have an abort called from main not show | |
1490 | main. */ | |
870b3035 AC |
1491 | if (DEPRECATED_FRAME_CHAIN_P ()) |
1492 | address = DEPRECATED_FRAME_CHAIN (this_frame); | |
1493 | else | |
1494 | { | |
1495 | /* Someone is part way through coverting an old architecture | |
1496 | to the new frame code. Implement FRAME_CHAIN the way the | |
1497 | new frame will. */ | |
1498 | /* Find PREV frame's unwinder. */ | |
e8a89fe2 | 1499 | prev->unwind = frame_unwind_find_by_frame (this_frame->next); |
870b3035 AC |
1500 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
1501 | type in the frame, the unwinder's type should be returned | |
ce2826aa | 1502 | directly. Unfortunately, legacy code, called by |
870b3035 AC |
1503 | legacy_get_prev_frame, explicitly set the frames type |
1504 | using the method deprecated_set_frame_type(). */ | |
1505 | prev->type = prev->unwind->type; | |
1506 | /* Find PREV frame's ID. */ | |
1507 | prev->unwind->this_id (this_frame, | |
1508 | &prev->prologue_cache, | |
1509 | &prev->this_id.value); | |
1510 | prev->this_id.p = 1; | |
1511 | address = prev->this_id.value.stack_addr; | |
1512 | } | |
4c1e7e9d | 1513 | |
e6ba3bc9 | 1514 | if (!legacy_frame_chain_valid (address, this_frame)) |
7f78e237 AC |
1515 | { |
1516 | if (frame_debug) | |
1517 | { | |
1518 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1519 | fprint_frame (gdb_stdlog, NULL); | |
1520 | fprintf_unfiltered (gdb_stdlog, | |
1521 | " // legacy frame chain invalid }\n"); | |
1522 | } | |
1523 | return NULL; | |
1524 | } | |
4c1e7e9d AC |
1525 | } |
1526 | if (address == 0) | |
7f78e237 AC |
1527 | { |
1528 | if (frame_debug) | |
1529 | { | |
1530 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1531 | fprint_frame (gdb_stdlog, NULL); | |
1532 | fprintf_unfiltered (gdb_stdlog, | |
1533 | " // legacy frame chain NULL }\n"); | |
1534 | } | |
1535 | return NULL; | |
1536 | } | |
4c1e7e9d | 1537 | |
055bb976 | 1538 | /* Link in the already allocated prev frame. */ |
03febf99 | 1539 | this_frame->prev = prev; |
11889732 | 1540 | deprecated_update_frame_base_hack (prev, address); |
4c1e7e9d | 1541 | |
95adb866 | 1542 | /* This change should not be needed, FIXME! We should determine |
a5afb99f | 1543 | whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen |
e9582e71 AC |
1544 | after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple |
1545 | way to express what goes on here. | |
95adb866 | 1546 | |
e9582e71 AC |
1547 | DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places: |
1548 | create_new_frame (where the PC is already set up) and here (where | |
1549 | it isn't). DEPRECATED_INIT_FRAME_PC is only called from here, | |
1550 | always after DEPRECATED_INIT_EXTRA_FRAME_INFO. | |
95adb866 | 1551 | |
e9582e71 AC |
1552 | The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO |
1553 | requires the PC value (which hasn't been set yet). Some other | |
1554 | machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO | |
1555 | before they can do DEPRECATED_INIT_FRAME_PC. Phoo. | |
95adb866 | 1556 | |
2ca6c561 AC |
1557 | We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more |
1558 | complication to an already overcomplicated part of GDB. | |
1559 | gnu@cygnus.com, 15Sep92. | |
95adb866 | 1560 | |
a5afb99f | 1561 | Assuming that some machines need DEPRECATED_INIT_FRAME_PC after |
e9582e71 | 1562 | DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme: |
95adb866 AC |
1563 | |
1564 | SETUP_INNERMOST_FRAME(): Default version is just create_new_frame | |
0ba6dca9 AC |
1565 | (deprecated_read_fp ()), read_pc ()). Machines with extra frame |
1566 | info would do that (or the local equivalent) and then set the | |
1567 | extra fields. | |
95adb866 AC |
1568 | |
1569 | SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that | |
1570 | create_new_frame would no longer init extra frame info; | |
1571 | SETUP_ARBITRARY_FRAME would have to do that. | |
1572 | ||
e9582e71 AC |
1573 | INIT_PREV_FRAME(fromleaf, prev) Replace |
1574 | DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC. | |
1575 | This should also return a flag saying whether to keep the new | |
1576 | frame, or whether to discard it, because on some machines (e.g. | |
618ce49f AC |
1577 | mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID |
1578 | called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good | |
1579 | way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID | |
1580 | into the extra fields of the new frame). std_frame_pc(fromleaf, | |
1581 | prev) | |
95adb866 AC |
1582 | |
1583 | This is the default setting for INIT_PREV_FRAME. It just does | |
a5afb99f AC |
1584 | what the default DEPRECATED_INIT_FRAME_PC does. Some machines |
1585 | will call it from INIT_PREV_FRAME (either at the beginning, the | |
1586 | end, or in the middle). Some machines won't use it. | |
95adb866 AC |
1587 | |
1588 | kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */ | |
1589 | ||
1590 | /* NOTE: cagney/2002-11-09: Just ignore the above! There is no | |
1591 | reason for things to be this complicated. | |
1592 | ||
1593 | The trick is to assume that there is always a frame. Instead of | |
1594 | special casing the inner-most frame, create fake frame | |
1595 | (containing the hardware registers) that is inner to the | |
1596 | user-visible inner-most frame (...) and then unwind from that. | |
1597 | That way architecture code can use use the standard | |
1598 | frame_XX_unwind() functions and not differentiate between the | |
1599 | inner most and any other case. | |
1600 | ||
1601 | Since there is always a frame to unwind from, there is always | |
03febf99 | 1602 | somewhere (THIS_FRAME) to store all the info needed to construct |
95adb866 AC |
1603 | a new (previous) frame without having to first create it. This |
1604 | means that the convolution below - needing to carefully order a | |
1605 | frame's initialization - isn't needed. | |
1606 | ||
618ce49f AC |
1607 | The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least |
1608 | for a more up-to-date architecture, always calls | |
1609 | FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but | |
1610 | without first needing the frame! Instead of the convolution | |
1611 | below, we could have simply called FRAME_SAVED_PC() and been done | |
1612 | with it! Note that FRAME_SAVED_PC() is being superseed by | |
1613 | frame_pc_unwind() and that function does have somewhere to cache | |
1614 | that PC value. */ | |
4c1e7e9d | 1615 | |
2ca6c561 | 1616 | if (DEPRECATED_INIT_FRAME_PC_FIRST_P ()) |
11889732 AC |
1617 | deprecated_update_frame_pc_hack (prev, |
1618 | DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf, | |
1619 | prev)); | |
4c1e7e9d | 1620 | |
e9582e71 AC |
1621 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1622 | DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev); | |
4c1e7e9d AC |
1623 | |
1624 | /* This entry is in the frame queue now, which is good since | |
95adb866 AC |
1625 | FRAME_SAVED_PC may use that queue to figure out its value (see |
1626 | tm-sparc.h). We want the pc saved in the inferior frame. */ | |
a5afb99f | 1627 | if (DEPRECATED_INIT_FRAME_PC_P ()) |
11889732 AC |
1628 | deprecated_update_frame_pc_hack (prev, |
1629 | DEPRECATED_INIT_FRAME_PC (fromleaf, | |
1630 | prev)); | |
4c1e7e9d | 1631 | |
95adb866 AC |
1632 | /* If ->frame and ->pc are unchanged, we are in the process of |
1633 | getting ourselves into an infinite backtrace. Some architectures | |
618ce49f AC |
1634 | check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems |
1635 | like there is no reason this can't be an architecture-independent | |
1636 | check. */ | |
11889732 AC |
1637 | if (get_frame_base (prev) == get_frame_base (this_frame) |
1638 | && get_frame_pc (prev) == get_frame_pc (this_frame)) | |
4c1e7e9d | 1639 | { |
03febf99 | 1640 | this_frame->prev = NULL; |
95adb866 | 1641 | obstack_free (&frame_cache_obstack, prev); |
7f78e237 AC |
1642 | if (frame_debug) |
1643 | { | |
1644 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1645 | fprint_frame (gdb_stdlog, NULL); | |
1646 | fprintf_unfiltered (gdb_stdlog, | |
1647 | " // legacy this.id == prev.id }\n"); | |
1648 | } | |
95adb866 | 1649 | return NULL; |
4c1e7e9d AC |
1650 | } |
1651 | ||
1652 | /* Initialize the code used to unwind the frame PREV based on the PC | |
1653 | (and probably other architectural information). The PC lets you | |
1654 | check things like the debug info at that point (dwarf2cfi?) and | |
870b3035 AC |
1655 | use that to decide how the frame should be unwound. |
1656 | ||
1657 | If there isn't a FRAME_CHAIN, the code above will have already | |
1658 | done this. */ | |
1659 | if (prev->unwind == NULL) | |
e8a89fe2 | 1660 | prev->unwind = frame_unwind_find_by_frame (prev->next); |
4c1e7e9d | 1661 | |
7df05f2b AC |
1662 | /* If the unwinder provides a frame type, use it. Otherwize |
1663 | continue on to that heuristic mess. */ | |
1664 | if (prev->unwind->type != UNKNOWN_FRAME) | |
1665 | { | |
1666 | prev->type = prev->unwind->type; | |
18adea3f | 1667 | if (prev->type == NORMAL_FRAME) |
870b3035 | 1668 | /* FIXME: cagney/2003-06-16: would get_frame_pc() be better? */ |
18adea3f AC |
1669 | prev->this_id.value.code_addr |
1670 | = get_pc_function_start (prev->this_id.value.code_addr); | |
7f78e237 AC |
1671 | if (frame_debug) |
1672 | { | |
1673 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1674 | fprint_frame (gdb_stdlog, prev); | |
1675 | fprintf_unfiltered (gdb_stdlog, " } // legacy with unwound type\n"); | |
1676 | } | |
7df05f2b AC |
1677 | return prev; |
1678 | } | |
1679 | ||
5a203e44 AC |
1680 | /* NOTE: cagney/2002-11-18: The code segments, found in |
1681 | create_new_frame and get_prev_frame(), that initializes the | |
1682 | frames type is subtly different. The latter only updates ->type | |
1683 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops | |
1684 | get_prev_frame() overriding the frame's type when the INIT code | |
1685 | has previously set it. This is really somewhat bogus. The | |
1686 | initialization, as seen in create_new_frame(), should occur | |
1687 | before the INIT function has been called. */ | |
07555a72 | 1688 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
ae45cd16 | 1689 | && (DEPRECATED_PC_IN_CALL_DUMMY_P () |
11889732 AC |
1690 | ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev), 0, 0) |
1691 | : pc_in_dummy_frame (get_frame_pc (prev)))) | |
5a203e44 AC |
1692 | prev->type = DUMMY_FRAME; |
1693 | else | |
1694 | { | |
1695 | /* FIXME: cagney/2002-11-10: This should be moved to before the | |
1696 | INIT code above so that the INIT code knows what the frame's | |
1697 | type is (in fact, for a [generic] dummy-frame, the type can | |
1698 | be set and then the entire initialization can be skipped. | |
1699 | Unforunatly, its the INIT code that sets the PC (Hmm, catch | |
1700 | 22). */ | |
1701 | char *name; | |
11889732 AC |
1702 | find_pc_partial_function (get_frame_pc (prev), &name, NULL, NULL); |
1703 | if (PC_IN_SIGTRAMP (get_frame_pc (prev), name)) | |
5a203e44 AC |
1704 | prev->type = SIGTRAMP_FRAME; |
1705 | /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some | |
1706 | architectures are forcing the frame's type in INIT so we | |
1707 | don't want to override it here. Remember, NORMAL_FRAME == 0, | |
1708 | so it all works (just :-/). Once this initialization is | |
1709 | moved to the start of this function, all this nastness will | |
1710 | go away. */ | |
1711 | } | |
4c1e7e9d | 1712 | |
18adea3f AC |
1713 | if (prev->type == NORMAL_FRAME) |
1714 | prev->this_id.value.code_addr | |
1715 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1716 | ||
7f78e237 AC |
1717 | if (frame_debug) |
1718 | { | |
1719 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1720 | fprint_frame (gdb_stdlog, prev); | |
1721 | fprintf_unfiltered (gdb_stdlog, " } // legacy with confused type\n"); | |
1722 | } | |
1723 | ||
4c1e7e9d AC |
1724 | return prev; |
1725 | } | |
1726 | ||
eb4f72c5 | 1727 | /* Return a structure containing various interesting information |
03febf99 | 1728 | about the frame that called THIS_FRAME. Returns NULL |
5bf00f29 MK |
1729 | if there is no such frame. |
1730 | ||
1731 | This function tests some target-independent conditions that should | |
1732 | terminate the frame chain, such as unwinding past main(). It | |
1733 | should not contain any target-dependent tests, such as checking | |
1734 | whether the program-counter is zero. */ | |
eb4f72c5 AC |
1735 | |
1736 | struct frame_info * | |
03febf99 | 1737 | get_prev_frame (struct frame_info *this_frame) |
eb4f72c5 AC |
1738 | { |
1739 | struct frame_info *prev_frame; | |
1740 | ||
7f78e237 AC |
1741 | if (frame_debug) |
1742 | { | |
1743 | fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame="); | |
1744 | if (this_frame != NULL) | |
1745 | fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level); | |
1746 | else | |
1747 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
1748 | fprintf_unfiltered (gdb_stdlog, ") "); | |
1749 | } | |
1750 | ||
eb4f72c5 AC |
1751 | /* Return the inner-most frame, when the caller passes in NULL. */ |
1752 | /* NOTE: cagney/2002-11-09: Not sure how this would happen. The | |
1753 | caller should have previously obtained a valid frame using | |
1754 | get_selected_frame() and then called this code - only possibility | |
1755 | I can think of is code behaving badly. | |
1756 | ||
1757 | NOTE: cagney/2003-01-10: Talk about code behaving badly. Check | |
1758 | block_innermost_frame(). It does the sequence: frame = NULL; | |
1759 | while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why | |
1760 | it couldn't be written better, I don't know. | |
1761 | ||
1762 | NOTE: cagney/2003-01-11: I suspect what is happening is | |
1763 | block_innermost_frame() is, when the target has no state | |
1764 | (registers, memory, ...), still calling this function. The | |
1765 | assumption being that this function will return NULL indicating | |
1766 | that a frame isn't possible, rather than checking that the target | |
1767 | has state and then calling get_current_frame() and | |
1768 | get_prev_frame(). This is a guess mind. */ | |
03febf99 | 1769 | if (this_frame == NULL) |
eb4f72c5 AC |
1770 | { |
1771 | /* NOTE: cagney/2002-11-09: There was a code segment here that | |
1772 | would error out when CURRENT_FRAME was NULL. The comment | |
1773 | that went with it made the claim ... | |
1774 | ||
1775 | ``This screws value_of_variable, which just wants a nice | |
1776 | clean NULL return from block_innermost_frame if there are no | |
1777 | frames. I don't think I've ever seen this message happen | |
1778 | otherwise. And returning NULL here is a perfectly legitimate | |
1779 | thing to do.'' | |
1780 | ||
1781 | Per the above, this code shouldn't even be called with a NULL | |
03febf99 | 1782 | THIS_FRAME. */ |
eb4f72c5 AC |
1783 | return current_frame; |
1784 | } | |
1785 | ||
1786 | /* There is always a frame. If this assertion fails, suspect that | |
1787 | something should be calling get_selected_frame() or | |
1788 | get_current_frame(). */ | |
03febf99 | 1789 | gdb_assert (this_frame != NULL); |
eb4f72c5 | 1790 | |
3f1d7f16 MK |
1791 | /* Make sure we pass an address within THIS_FRAME's code block to |
1792 | inside_main_func. Otherwise, we might stop unwinding at a | |
1793 | function which has a call instruction as its last instruction if | |
1794 | that function immediately precedes main(). */ | |
03febf99 | 1795 | if (this_frame->level >= 0 |
25d29d70 | 1796 | && !backtrace_past_main |
3f1d7f16 | 1797 | && inside_main_func (get_frame_address_in_block (this_frame))) |
eb4f72c5 AC |
1798 | /* Don't unwind past main(), bug always unwind the sentinel frame. |
1799 | Note, this is done _before_ the frame has been marked as | |
1800 | previously unwound. That way if the user later decides to | |
1801 | allow unwinds past main(), that just happens. */ | |
ac2bd0a9 AC |
1802 | { |
1803 | if (frame_debug) | |
7f78e237 | 1804 | fprintf_unfiltered (gdb_stdlog, "-> NULL // inside main func }\n"); |
ac2bd0a9 AC |
1805 | return NULL; |
1806 | } | |
eb4f72c5 | 1807 | |
25d29d70 AC |
1808 | if (this_frame->level > backtrace_limit) |
1809 | { | |
1810 | error ("Backtrace limit of %d exceeded", backtrace_limit); | |
1811 | } | |
1812 | ||
0714963c AC |
1813 | /* If we're already inside the entry function for the main objfile, |
1814 | then it isn't valid. Don't apply this test to a dummy frame - | |
1815 | dummy frame PC's typically land in the entry func. Don't apply | |
1816 | this test to the sentinel frame. Sentinel frames should always | |
1817 | be allowed to unwind. */ | |
1818 | /* NOTE: cagney/2003-02-25: Don't enable until someone has found | |
1819 | hard evidence that this is needed. */ | |
1820 | /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func - wasn't | |
1821 | checking for "main" in the minimal symbols. With that fixed | |
1822 | asm-source tests now stop in "main" instead of halting the | |
1823 | backtrace in wierd and wonderful ways somewhere inside the entry | |
627b3ba2 AC |
1824 | file. Suspect that deprecated_inside_entry_file and |
1825 | inside_entry_func tests were added to work around that (now | |
1826 | fixed) case. */ | |
0714963c AC |
1827 | /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right) |
1828 | suggested having the inside_entry_func test use the | |
1829 | inside_main_func msymbol trick (along with entry_point_address I | |
1830 | guess) to determine the address range of the start function. | |
1831 | That should provide a far better stopper than the current | |
1832 | heuristics. */ | |
1833 | /* NOTE: cagney/2003-07-15: Need to add a "set backtrace | |
1834 | beyond-entry-func" command so that this can be selectively | |
1835 | disabled. */ | |
1836 | if (0 | |
1837 | #if 0 | |
1838 | && backtrace_beyond_entry_func | |
1839 | #endif | |
1840 | && this_frame->type != DUMMY_FRAME && this_frame->level >= 0 | |
6e4c6c91 | 1841 | && inside_entry_func (this_frame)) |
0714963c AC |
1842 | { |
1843 | if (frame_debug) | |
1844 | { | |
1845 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1846 | fprint_frame (gdb_stdlog, NULL); | |
1847 | fprintf_unfiltered (gdb_stdlog, "// inside entry func }\n"); | |
1848 | } | |
1849 | return NULL; | |
1850 | } | |
1851 | ||
eb4f72c5 | 1852 | /* Only try to do the unwind once. */ |
03febf99 | 1853 | if (this_frame->prev_p) |
7f78e237 AC |
1854 | { |
1855 | if (frame_debug) | |
1856 | { | |
1857 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1858 | fprint_frame (gdb_stdlog, this_frame->prev); | |
1859 | fprintf_unfiltered (gdb_stdlog, " // cached \n"); | |
1860 | } | |
1861 | return this_frame->prev; | |
1862 | } | |
03febf99 | 1863 | this_frame->prev_p = 1; |
eb4f72c5 | 1864 | |
b14185ce AC |
1865 | /* If we're inside the entry file, it isn't valid. Don't apply this |
1866 | test to a dummy frame - dummy frame PC's typically land in the | |
1867 | entry file. Don't apply this test to the sentinel frame. | |
1868 | Sentinel frames should always be allowed to unwind. */ | |
eb4f72c5 AC |
1869 | /* NOTE: drow/2002-12-25: should there be a way to disable this |
1870 | check? It assumes a single small entry file, and the way some | |
1871 | debug readers (e.g. dbxread) figure out which object is the | |
1872 | entry file is somewhat hokey. */ | |
1873 | /* NOTE: cagney/2003-01-10: If there is a way of disabling this test | |
1874 | then it should probably be moved to before the ->prev_p test, | |
1875 | above. */ | |
627b3ba2 AC |
1876 | /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call |
1877 | to deprecated_inside_entry_file destroys a meaningful backtrace | |
1878 | under some conditions. E. g. the backtrace tests in the | |
1879 | asm-source testcase are broken for some targets. In this test | |
1880 | the functions are all implemented as part of one file and the | |
1881 | testcase is not necessarily linked with a start file (depending | |
1882 | on the target). What happens is, that the first frame is printed | |
1883 | normaly and following frames are treated as being inside the | |
1884 | enttry file then. This way, only the #0 frame is printed in the | |
1885 | backtrace output. */ | |
1886 | if (0 | |
1887 | && this_frame->type != DUMMY_FRAME && this_frame->level >= 0 | |
1888 | && deprecated_inside_entry_file (get_frame_pc (this_frame))) | |
ac2bd0a9 AC |
1889 | { |
1890 | if (frame_debug) | |
7f78e237 AC |
1891 | { |
1892 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1893 | fprint_frame (gdb_stdlog, NULL); | |
1894 | fprintf_unfiltered (gdb_stdlog, " // inside entry file }\n"); | |
1895 | } | |
eb4f72c5 | 1896 | return NULL; |
ac2bd0a9 | 1897 | } |
eb4f72c5 AC |
1898 | |
1899 | /* If any of the old frame initialization methods are around, use | |
055bb976 AC |
1900 | the legacy get_prev_frame method. */ |
1901 | if (legacy_frame_p (current_gdbarch)) | |
ac2bd0a9 | 1902 | { |
03febf99 | 1903 | prev_frame = legacy_get_prev_frame (this_frame); |
ac2bd0a9 AC |
1904 | return prev_frame; |
1905 | } | |
eb4f72c5 | 1906 | |
270c3b1d AC |
1907 | /* Check that this frame's ID was valid. If it wasn't, don't try to |
1908 | unwind to the prev frame. Be careful to not apply this test to | |
1909 | the sentinel frame. */ | |
1910 | if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame))) | |
1911 | { | |
1912 | if (frame_debug) | |
7f78e237 AC |
1913 | { |
1914 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1915 | fprint_frame (gdb_stdlog, NULL); | |
1916 | fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n"); | |
1917 | } | |
270c3b1d AC |
1918 | return NULL; |
1919 | } | |
1920 | ||
1921 | /* Check that this frame's ID isn't inner to (younger, below, next) | |
612dde91 AC |
1922 | the next frame. This happens when a frame unwind goes backwards. |
1923 | Since the sentinel frame doesn't really exist, don't compare the | |
1924 | inner-most against that sentinel. */ | |
270c3b1d AC |
1925 | if (this_frame->level > 0 |
1926 | && frame_id_inner (get_frame_id (this_frame), | |
1927 | get_frame_id (this_frame->next))) | |
612dde91 AC |
1928 | error ("Previous frame inner to this frame (corrupt stack?)"); |
1929 | ||
1930 | /* Check that this and the next frame are not identical. If they | |
1931 | are, there is most likely a stack cycle. As with the inner-than | |
1932 | test above, avoid comparing the inner-most and sentinel frames. */ | |
1933 | if (this_frame->level > 0 | |
270c3b1d AC |
1934 | && frame_id_eq (get_frame_id (this_frame), |
1935 | get_frame_id (this_frame->next))) | |
612dde91 | 1936 | error ("Previous frame identical to this frame (corrupt stack?)"); |
270c3b1d | 1937 | |
eb4f72c5 AC |
1938 | /* Allocate the new frame but do not wire it in to the frame chain. |
1939 | Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along | |
1940 | frame->next to pull some fancy tricks (of course such code is, by | |
1941 | definition, recursive). Try to prevent it. | |
1942 | ||
1943 | There is no reason to worry about memory leaks, should the | |
1944 | remainder of the function fail. The allocated memory will be | |
1945 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1946 | been here before' check above will stop repeated memory | |
1947 | allocation calls. */ | |
1948 | prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
03febf99 | 1949 | prev_frame->level = this_frame->level + 1; |
eb4f72c5 | 1950 | |
c50901fd AC |
1951 | /* Don't yet compute ->unwind (and hence ->type). It is computed |
1952 | on-demand in get_frame_type, frame_register_unwind, and | |
1953 | get_frame_id. */ | |
eb4f72c5 | 1954 | |
c50901fd AC |
1955 | /* Don't yet compute the frame's ID. It is computed on-demand by |
1956 | get_frame_id(). */ | |
6dc42492 | 1957 | |
270c3b1d AC |
1958 | /* The unwound frame ID is validate at the start of this function, |
1959 | as part of the logic to decide if that frame should be further | |
1960 | unwound, and not here while the prev frame is being created. | |
1961 | Doing this makes it possible for the user to examine a frame that | |
1962 | has an invalid frame ID. | |
1963 | ||
25e3a86b AC |
1964 | Some very old VAX code noted: [...] For the sake of argument, |
1965 | suppose that the stack is somewhat trashed (which is one reason | |
1966 | that "info frame" exists). So, return 0 (indicating we don't | |
1967 | know the address of the arglist) if we don't know what frame this | |
1968 | frame calls. */ | |
6dc42492 | 1969 | |
eb4f72c5 | 1970 | /* Link it in. */ |
03febf99 AC |
1971 | this_frame->prev = prev_frame; |
1972 | prev_frame->next = this_frame; | |
eb4f72c5 | 1973 | |
7f78e237 AC |
1974 | if (frame_debug) |
1975 | { | |
1976 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1977 | fprint_frame (gdb_stdlog, prev_frame); | |
1978 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1979 | } | |
1980 | ||
eb4f72c5 AC |
1981 | return prev_frame; |
1982 | } | |
1983 | ||
4c1e7e9d AC |
1984 | CORE_ADDR |
1985 | get_frame_pc (struct frame_info *frame) | |
1986 | { | |
d1340264 AC |
1987 | gdb_assert (frame->next != NULL); |
1988 | return frame_pc_unwind (frame->next); | |
4c1e7e9d AC |
1989 | } |
1990 | ||
8edd5d01 AC |
1991 | /* Return an address of that falls within the frame's code block. */ |
1992 | ||
1993 | CORE_ADDR | |
1994 | frame_unwind_address_in_block (struct frame_info *next_frame) | |
1995 | { | |
1996 | /* A draft address. */ | |
1997 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
1998 | ||
1999 | /* If THIS frame is not inner most (i.e., NEXT isn't the sentinel), | |
2000 | and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS | |
2001 | frame's PC ends up pointing at the instruction fallowing the | |
2002 | "call". Adjust that PC value so that it falls on the call | |
2003 | instruction (which, hopefully, falls within THIS frame's code | |
2004 | block. So far it's proved to be a very good approximation. See | |
2005 | get_frame_type for why ->type can't be used. */ | |
2006 | if (next_frame->level >= 0 | |
2007 | && get_frame_type (next_frame) == NORMAL_FRAME) | |
2008 | --pc; | |
2009 | return pc; | |
2010 | } | |
2011 | ||
2012 | CORE_ADDR | |
2013 | get_frame_address_in_block (struct frame_info *this_frame) | |
2014 | { | |
2015 | return frame_unwind_address_in_block (this_frame->next); | |
2016 | } | |
2017 | ||
1058bca7 AC |
2018 | static int |
2019 | pc_notcurrent (struct frame_info *frame) | |
2020 | { | |
2021 | /* If FRAME is not the innermost frame, that normally means that | |
2022 | FRAME->pc points at the return instruction (which is *after* the | |
2023 | call instruction), and we want to get the line containing the | |
2024 | call (because the call is where the user thinks the program is). | |
2025 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
2026 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
2027 | PC and such a PC indicates the current (rather than next) | |
2028 | instruction/line, consequently, for such cases, want to get the | |
2029 | line containing fi->pc. */ | |
2030 | struct frame_info *next = get_next_frame (frame); | |
2031 | int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME); | |
2032 | return notcurrent; | |
2033 | } | |
2034 | ||
2035 | void | |
2036 | find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal) | |
2037 | { | |
11889732 | 2038 | (*sal) = find_pc_line (get_frame_pc (frame), pc_notcurrent (frame)); |
1058bca7 AC |
2039 | } |
2040 | ||
c193f6ac AC |
2041 | /* Per "frame.h", return the ``address'' of the frame. Code should |
2042 | really be using get_frame_id(). */ | |
2043 | CORE_ADDR | |
2044 | get_frame_base (struct frame_info *fi) | |
2045 | { | |
d0a55772 | 2046 | return get_frame_id (fi).stack_addr; |
c193f6ac AC |
2047 | } |
2048 | ||
da62e633 AC |
2049 | /* High-level offsets into the frame. Used by the debug info. */ |
2050 | ||
2051 | CORE_ADDR | |
2052 | get_frame_base_address (struct frame_info *fi) | |
2053 | { | |
7df05f2b | 2054 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2055 | return 0; |
2056 | if (fi->base == NULL) | |
e8a89fe2 | 2057 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2058 | /* Sneaky: If the low-level unwind and high-level base code share a |
2059 | common unwinder, let them share the prologue cache. */ | |
2060 | if (fi->base->unwind == fi->unwind) | |
2061 | return fi->base->this_base (fi->next, &fi->prologue_cache); | |
2062 | return fi->base->this_base (fi->next, &fi->base_cache); | |
2063 | } | |
2064 | ||
2065 | CORE_ADDR | |
2066 | get_frame_locals_address (struct frame_info *fi) | |
2067 | { | |
2068 | void **cache; | |
7df05f2b | 2069 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2070 | return 0; |
2071 | /* If there isn't a frame address method, find it. */ | |
2072 | if (fi->base == NULL) | |
e8a89fe2 | 2073 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2074 | /* Sneaky: If the low-level unwind and high-level base code share a |
2075 | common unwinder, let them share the prologue cache. */ | |
2076 | if (fi->base->unwind == fi->unwind) | |
2077 | cache = &fi->prologue_cache; | |
2078 | else | |
2079 | cache = &fi->base_cache; | |
2080 | return fi->base->this_locals (fi->next, cache); | |
2081 | } | |
2082 | ||
2083 | CORE_ADDR | |
2084 | get_frame_args_address (struct frame_info *fi) | |
2085 | { | |
2086 | void **cache; | |
7df05f2b | 2087 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2088 | return 0; |
2089 | /* If there isn't a frame address method, find it. */ | |
2090 | if (fi->base == NULL) | |
e8a89fe2 | 2091 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2092 | /* Sneaky: If the low-level unwind and high-level base code share a |
2093 | common unwinder, let them share the prologue cache. */ | |
2094 | if (fi->base->unwind == fi->unwind) | |
2095 | cache = &fi->prologue_cache; | |
2096 | else | |
2097 | cache = &fi->base_cache; | |
2098 | return fi->base->this_args (fi->next, cache); | |
2099 | } | |
2100 | ||
85cf597a AC |
2101 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
2102 | or -1 for a NULL frame. */ | |
2103 | ||
2104 | int | |
2105 | frame_relative_level (struct frame_info *fi) | |
2106 | { | |
2107 | if (fi == NULL) | |
2108 | return -1; | |
2109 | else | |
2110 | return fi->level; | |
2111 | } | |
2112 | ||
5a203e44 AC |
2113 | enum frame_type |
2114 | get_frame_type (struct frame_info *frame) | |
2115 | { | |
2116 | /* Some targets still don't use [generic] dummy frames. Catch them | |
2117 | here. */ | |
07555a72 | 2118 | if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
5a203e44 AC |
2119 | && deprecated_frame_in_dummy (frame)) |
2120 | return DUMMY_FRAME; | |
710ee10a KB |
2121 | |
2122 | /* Some legacy code, e.g, mips_init_extra_frame_info() wants | |
2123 | to determine the frame's type prior to it being completely | |
2124 | initialized. Don't attempt to lazily initialize ->unwind for | |
2125 | legacy code. It will be initialized in legacy_get_prev_frame(). */ | |
2126 | if (frame->unwind == NULL && !legacy_frame_p (current_gdbarch)) | |
c50901fd AC |
2127 | { |
2128 | /* Initialize the frame's unwinder because it is that which | |
2129 | provides the frame's type. */ | |
e8a89fe2 | 2130 | frame->unwind = frame_unwind_find_by_frame (frame->next); |
c50901fd AC |
2131 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
2132 | type in the frame, the unwinder's type should be returned | |
ce2826aa | 2133 | directly. Unfortunately, legacy code, called by |
c50901fd AC |
2134 | legacy_get_prev_frame, explicitly set the frames type using |
2135 | the method deprecated_set_frame_type(). */ | |
2136 | gdb_assert (frame->unwind->type != UNKNOWN_FRAME); | |
2137 | frame->type = frame->unwind->type; | |
2138 | } | |
7df05f2b AC |
2139 | if (frame->type == UNKNOWN_FRAME) |
2140 | return NORMAL_FRAME; | |
2141 | else | |
2142 | return frame->type; | |
5a203e44 AC |
2143 | } |
2144 | ||
2145 | void | |
2146 | deprecated_set_frame_type (struct frame_info *frame, enum frame_type type) | |
2147 | { | |
2148 | /* Arrrg! See comment in "frame.h". */ | |
2149 | frame->type = type; | |
2150 | } | |
2151 | ||
0394eb2a AC |
2152 | struct frame_extra_info * |
2153 | get_frame_extra_info (struct frame_info *fi) | |
2154 | { | |
2155 | return fi->extra_info; | |
2156 | } | |
2157 | ||
2c517d0e AC |
2158 | struct frame_extra_info * |
2159 | frame_extra_info_zalloc (struct frame_info *fi, long size) | |
2160 | { | |
479ab5a0 | 2161 | fi->extra_info = frame_obstack_zalloc (size); |
2c517d0e AC |
2162 | return fi->extra_info; |
2163 | } | |
2164 | ||
b87efeee | 2165 | void |
2f107107 | 2166 | deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc) |
b87efeee | 2167 | { |
7f78e237 AC |
2168 | if (frame_debug) |
2169 | fprintf_unfiltered (gdb_stdlog, | |
2170 | "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n", | |
2171 | frame->level, paddr_nz (pc)); | |
e0d2ae16 AC |
2172 | /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are |
2173 | maintaining a locally allocated frame object. Since such frame's | |
2174 | are not in the frame chain, it isn't possible to assume that the | |
2175 | frame has a next. Sigh. */ | |
2176 | if (frame->next != NULL) | |
2177 | { | |
2178 | /* While we're at it, update this frame's cached PC value, found | |
2179 | in the next frame. Oh for the day when "struct frame_info" | |
2180 | is opaque and this hack on hack can just go away. */ | |
d1340264 AC |
2181 | frame->next->prev_pc.value = pc; |
2182 | frame->next->prev_pc.p = 1; | |
e0d2ae16 | 2183 | } |
2f107107 AC |
2184 | } |
2185 | ||
2186 | void | |
2187 | deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base) | |
2188 | { | |
7f78e237 AC |
2189 | if (frame_debug) |
2190 | fprintf_unfiltered (gdb_stdlog, | |
2191 | "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n", | |
2192 | frame->level, paddr_nz (base)); | |
2f107107 | 2193 | /* See comment in "frame.h". */ |
d0a55772 | 2194 | frame->this_id.value.stack_addr = base; |
b87efeee AC |
2195 | } |
2196 | ||
c8b8a898 | 2197 | struct frame_info * |
213cc0ad AC |
2198 | deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs, |
2199 | long sizeof_extra_info) | |
c8b8a898 | 2200 | { |
bcf7d3ca AC |
2201 | struct frame_info *frame = XMALLOC (struct frame_info); |
2202 | memset (frame, 0, sizeof (*frame)); | |
18adea3f | 2203 | frame->this_id.p = 1; |
f6c609c4 AC |
2204 | make_cleanup (xfree, frame); |
2205 | if (sizeof_saved_regs > 0) | |
2206 | { | |
2207 | frame->saved_regs = xcalloc (1, sizeof_saved_regs); | |
2208 | make_cleanup (xfree, frame->saved_regs); | |
2209 | } | |
2210 | if (sizeof_extra_info > 0) | |
2211 | { | |
2212 | frame->extra_info = xcalloc (1, sizeof_extra_info); | |
2213 | make_cleanup (xfree, frame->extra_info); | |
2214 | } | |
2215 | return frame; | |
2216 | } | |
c8b8a898 | 2217 | |
ae1e7417 AC |
2218 | /* Memory access methods. */ |
2219 | ||
2220 | void | |
2221 | get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, void *buf, | |
2222 | int len) | |
2223 | { | |
2224 | read_memory (addr, buf, len); | |
2225 | } | |
2226 | ||
2227 | LONGEST | |
2228 | get_frame_memory_signed (struct frame_info *this_frame, CORE_ADDR addr, | |
2229 | int len) | |
2230 | { | |
2231 | return read_memory_integer (addr, len); | |
2232 | } | |
2233 | ||
2234 | ULONGEST | |
2235 | get_frame_memory_unsigned (struct frame_info *this_frame, CORE_ADDR addr, | |
2236 | int len) | |
2237 | { | |
2238 | return read_memory_unsigned_integer (addr, len); | |
2239 | } | |
2240 | ||
2241 | /* Architecture method. */ | |
2242 | ||
2243 | struct gdbarch * | |
2244 | get_frame_arch (struct frame_info *this_frame) | |
2245 | { | |
2246 | return current_gdbarch; | |
2247 | } | |
2248 | ||
a9e5fdc2 AC |
2249 | /* Stack pointer methods. */ |
2250 | ||
2251 | CORE_ADDR | |
2252 | get_frame_sp (struct frame_info *this_frame) | |
2253 | { | |
2254 | return frame_sp_unwind (this_frame->next); | |
2255 | } | |
2256 | ||
2257 | CORE_ADDR | |
2258 | frame_sp_unwind (struct frame_info *next_frame) | |
2259 | { | |
2260 | /* Normality, an architecture that provides a way of obtaining any | |
2261 | frame inner-most address. */ | |
2262 | if (gdbarch_unwind_sp_p (current_gdbarch)) | |
2263 | return gdbarch_unwind_sp (current_gdbarch, next_frame); | |
2264 | /* Things are looking grim. If it's the inner-most frame and there | |
2265 | is a TARGET_READ_SP then that can be used. */ | |
2266 | if (next_frame->level < 0 && TARGET_READ_SP_P ()) | |
2267 | return TARGET_READ_SP (); | |
2268 | /* Now things are really are grim. Hope that the value returned by | |
2269 | the SP_REGNUM register is meaningful. */ | |
2270 | if (SP_REGNUM >= 0) | |
2271 | { | |
2272 | ULONGEST sp; | |
2273 | frame_unwind_unsigned_register (next_frame, SP_REGNUM, &sp); | |
2274 | return sp; | |
2275 | } | |
2276 | internal_error (__FILE__, __LINE__, "Missing unwind SP method"); | |
2277 | } | |
2278 | ||
2279 | ||
1594fa56 AC |
2280 | int |
2281 | legacy_frame_p (struct gdbarch *current_gdbarch) | |
2282 | { | |
2283 | return (DEPRECATED_INIT_FRAME_PC_P () | |
2284 | || DEPRECATED_INIT_FRAME_PC_FIRST_P () | |
2285 | || DEPRECATED_INIT_EXTRA_FRAME_INFO_P () | |
618ce49f | 2286 | || DEPRECATED_FRAME_CHAIN_P () |
3e210248 | 2287 | || !gdbarch_unwind_dummy_id_p (current_gdbarch)); |
1594fa56 AC |
2288 | } |
2289 | ||
b9362cc7 AC |
2290 | extern initialize_file_ftype _initialize_frame; /* -Wmissing-prototypes */ |
2291 | ||
25d29d70 AC |
2292 | static struct cmd_list_element *set_backtrace_cmdlist; |
2293 | static struct cmd_list_element *show_backtrace_cmdlist; | |
2294 | ||
2295 | static void | |
2296 | set_backtrace_cmd (char *args, int from_tty) | |
2297 | { | |
2298 | help_list (set_backtrace_cmdlist, "set backtrace ", -1, gdb_stdout); | |
2299 | } | |
2300 | ||
2301 | static void | |
2302 | show_backtrace_cmd (char *args, int from_tty) | |
2303 | { | |
2304 | cmd_show_list (show_backtrace_cmdlist, from_tty, ""); | |
2305 | } | |
2306 | ||
4c1e7e9d AC |
2307 | void |
2308 | _initialize_frame (void) | |
2309 | { | |
2310 | obstack_init (&frame_cache_obstack); | |
eb4f72c5 | 2311 | |
25d29d70 AC |
2312 | add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, "\ |
2313 | Set backtrace specific variables.\n\ | |
2314 | Configure backtrace variables such as the backtrace limit", | |
2315 | &set_backtrace_cmdlist, "set backtrace ", | |
2316 | 0/*allow-unknown*/, &setlist); | |
2317 | add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, "\ | |
2318 | Show backtrace specific variables\n\ | |
2319 | Show backtrace variables such as the backtrace limit", | |
2320 | &show_backtrace_cmdlist, "show backtrace ", | |
2321 | 0/*allow-unknown*/, &showlist); | |
2322 | ||
2323 | add_setshow_boolean_cmd ("past-main", class_obscure, | |
2324 | &backtrace_past_main, "\ | |
eb4f72c5 AC |
2325 | Set whether backtraces should continue past \"main\".\n\ |
2326 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2327 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2328 | of the stack trace.", "\ | |
2329 | Show whether backtraces should continue past \"main\".\n\ | |
2330 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2331 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2332 | of the stack trace.", | |
25d29d70 AC |
2333 | NULL, NULL, &set_backtrace_cmdlist, |
2334 | &show_backtrace_cmdlist); | |
2335 | ||
2336 | add_setshow_uinteger_cmd ("limit", class_obscure, | |
2337 | &backtrace_limit, "\ | |
2338 | Set an upper bound on the number of backtrace levels.\n\ | |
fec74868 | 2339 | No more than the specified number of frames can be displayed or examined.\n\ |
25d29d70 AC |
2340 | Zero is unlimited.", "\ |
2341 | Show the upper bound on the number of backtrace levels.", | |
2342 | NULL, NULL, &set_backtrace_cmdlist, | |
2343 | &show_backtrace_cmdlist); | |
ac2bd0a9 AC |
2344 | |
2345 | /* Debug this files internals. */ | |
2346 | add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger, | |
2347 | &frame_debug, "Set frame debugging.\n\ | |
2348 | When non-zero, frame specific internal debugging is enabled.", &setdebuglist), | |
2349 | &showdebuglist); | |
4c1e7e9d | 2350 | } |