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(). */ | |
c50901fd AC |
237 | fi->type = fi->unwind->type; |
238 | } | |
06c77151 | 239 | /* Find THIS frame's ID. */ |
d0a55772 AC |
240 | fi->unwind->this_id (fi->next, &fi->prologue_cache, &fi->this_id.value); |
241 | fi->this_id.p = 1; | |
7f78e237 AC |
242 | if (frame_debug) |
243 | { | |
244 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
245 | fprint_frame_id (gdb_stdlog, fi->this_id.value); | |
246 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
247 | } | |
101dcfbe | 248 | } |
18adea3f | 249 | return fi->this_id.value; |
101dcfbe AC |
250 | } |
251 | ||
7a424e99 AC |
252 | const struct frame_id null_frame_id; /* All zeros. */ |
253 | ||
254 | struct frame_id | |
48c66725 JJ |
255 | frame_id_build_special (CORE_ADDR stack_addr, CORE_ADDR code_addr, |
256 | CORE_ADDR special_addr) | |
7a424e99 AC |
257 | { |
258 | struct frame_id id; | |
d0a55772 AC |
259 | id.stack_addr = stack_addr; |
260 | id.code_addr = code_addr; | |
48c66725 | 261 | id.special_addr = special_addr; |
7a424e99 AC |
262 | return id; |
263 | } | |
264 | ||
48c66725 JJ |
265 | struct frame_id |
266 | frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr) | |
267 | { | |
268 | return frame_id_build_special (stack_addr, code_addr, 0); | |
269 | } | |
270 | ||
7a424e99 AC |
271 | int |
272 | frame_id_p (struct frame_id l) | |
273 | { | |
d0a55772 AC |
274 | int p; |
275 | /* The .code can be NULL but the .stack cannot. */ | |
276 | p = (l.stack_addr != 0); | |
7f78e237 AC |
277 | if (frame_debug) |
278 | { | |
279 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_p (l="); | |
280 | fprint_frame_id (gdb_stdlog, l); | |
281 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", p); | |
282 | } | |
d0a55772 | 283 | return p; |
7a424e99 AC |
284 | } |
285 | ||
286 | int | |
287 | frame_id_eq (struct frame_id l, struct frame_id r) | |
288 | { | |
d0a55772 AC |
289 | int eq; |
290 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
291 | /* Like a NaN, if either ID is invalid, the result is false. */ | |
292 | eq = 0; | |
293 | else if (l.stack_addr != r.stack_addr) | |
294 | /* If .stack addresses are different, the frames are different. */ | |
295 | eq = 0; | |
296 | else if (l.code_addr == 0 || r.code_addr == 0) | |
297 | /* A zero code addr is a wild card, always succeed. */ | |
298 | eq = 1; | |
48c66725 JJ |
299 | else if (l.code_addr != r.code_addr) |
300 | /* If .code addresses are different, the frames are different. */ | |
301 | eq = 0; | |
302 | else if (l.special_addr == 0 || r.special_addr == 0) | |
303 | /* A zero special addr is a wild card (or unused), always succeed. */ | |
304 | eq = 1; | |
305 | else if (l.special_addr == r.special_addr) | |
306 | /* Frames are equal. */ | |
d0a55772 AC |
307 | eq = 1; |
308 | else | |
4aa79dcc AC |
309 | /* No luck. */ |
310 | eq = 0; | |
7f78e237 AC |
311 | if (frame_debug) |
312 | { | |
313 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (l="); | |
314 | fprint_frame_id (gdb_stdlog, l); | |
315 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
316 | fprint_frame_id (gdb_stdlog, r); | |
317 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", eq); | |
318 | } | |
d0a55772 | 319 | return eq; |
7a424e99 AC |
320 | } |
321 | ||
322 | int | |
323 | frame_id_inner (struct frame_id l, struct frame_id r) | |
324 | { | |
d0a55772 AC |
325 | int inner; |
326 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
327 | /* Like NaN, any operation involving an invalid ID always fails. */ | |
328 | inner = 0; | |
329 | else | |
330 | /* Only return non-zero when strictly inner than. Note that, per | |
331 | comment in "frame.h", there is some fuzz here. Frameless | |
332 | functions are not strictly inner than (same .stack but | |
48c66725 | 333 | different .code and/or .special address). */ |
d0a55772 | 334 | inner = INNER_THAN (l.stack_addr, r.stack_addr); |
7f78e237 AC |
335 | if (frame_debug) |
336 | { | |
337 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_inner (l="); | |
338 | fprint_frame_id (gdb_stdlog, l); | |
339 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
340 | fprint_frame_id (gdb_stdlog, r); | |
341 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", inner); | |
342 | } | |
d0a55772 | 343 | return inner; |
7a424e99 AC |
344 | } |
345 | ||
101dcfbe AC |
346 | struct frame_info * |
347 | frame_find_by_id (struct frame_id id) | |
348 | { | |
349 | struct frame_info *frame; | |
350 | ||
351 | /* ZERO denotes the null frame, let the caller decide what to do | |
352 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 353 | if (!frame_id_p (id)) |
101dcfbe AC |
354 | return NULL; |
355 | ||
356 | for (frame = get_current_frame (); | |
357 | frame != NULL; | |
358 | frame = get_prev_frame (frame)) | |
359 | { | |
7a424e99 AC |
360 | struct frame_id this = get_frame_id (frame); |
361 | if (frame_id_eq (id, this)) | |
362 | /* An exact match. */ | |
363 | return frame; | |
364 | if (frame_id_inner (id, this)) | |
365 | /* Gone to far. */ | |
101dcfbe | 366 | return NULL; |
7a424e99 AC |
367 | /* Either, we're not yet gone far enough out along the frame |
368 | chain (inner(this,id), or we're comparing frameless functions | |
369 | (same .base, different .func, no test available). Struggle | |
370 | on until we've definitly gone to far. */ | |
101dcfbe AC |
371 | } |
372 | return NULL; | |
373 | } | |
374 | ||
f18c5a73 | 375 | CORE_ADDR |
12cc2063 | 376 | frame_pc_unwind (struct frame_info *this_frame) |
f18c5a73 | 377 | { |
d1340264 | 378 | if (!this_frame->prev_pc.p) |
f18c5a73 | 379 | { |
12cc2063 AC |
380 | CORE_ADDR pc; |
381 | if (gdbarch_unwind_pc_p (current_gdbarch)) | |
382 | { | |
383 | /* The right way. The `pure' way. The one true way. This | |
384 | method depends solely on the register-unwind code to | |
385 | determine the value of registers in THIS frame, and hence | |
386 | the value of this frame's PC (resume address). A typical | |
387 | implementation is no more than: | |
388 | ||
389 | frame_unwind_register (this_frame, ISA_PC_REGNUM, buf); | |
af1342ab | 390 | return extract_unsigned_integer (buf, size of ISA_PC_REGNUM); |
12cc2063 AC |
391 | |
392 | Note: this method is very heavily dependent on a correct | |
393 | register-unwind implementation, it pays to fix that | |
394 | method first; this method is frame type agnostic, since | |
395 | it only deals with register values, it works with any | |
396 | frame. This is all in stark contrast to the old | |
397 | FRAME_SAVED_PC which would try to directly handle all the | |
398 | different ways that a PC could be unwound. */ | |
399 | pc = gdbarch_unwind_pc (current_gdbarch, this_frame); | |
400 | } | |
401 | else if (this_frame->level < 0) | |
402 | { | |
403 | /* FIXME: cagney/2003-03-06: Old code and and a sentinel | |
404 | frame. Do like was always done. Fetch the PC's value | |
405 | direct from the global registers array (via read_pc). | |
406 | This assumes that this frame belongs to the current | |
407 | global register cache. The assumption is dangerous. */ | |
408 | pc = read_pc (); | |
409 | } | |
8bedc050 | 410 | else if (DEPRECATED_FRAME_SAVED_PC_P ()) |
12cc2063 AC |
411 | { |
412 | /* FIXME: cagney/2003-03-06: Old code, but not a sentinel | |
413 | frame. Do like was always done. Note that this method, | |
414 | unlike unwind_pc(), tries to handle all the different | |
415 | frame cases directly. It fails. */ | |
8bedc050 | 416 | pc = DEPRECATED_FRAME_SAVED_PC (this_frame); |
12cc2063 AC |
417 | } |
418 | else | |
419 | internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method"); | |
d1340264 AC |
420 | this_frame->prev_pc.value = pc; |
421 | this_frame->prev_pc.p = 1; | |
7f78e237 AC |
422 | if (frame_debug) |
423 | fprintf_unfiltered (gdb_stdlog, | |
424 | "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n", | |
425 | this_frame->level, | |
426 | paddr_nz (this_frame->prev_pc.value)); | |
f18c5a73 | 427 | } |
d1340264 | 428 | return this_frame->prev_pc.value; |
f18c5a73 AC |
429 | } |
430 | ||
be41e9f4 AC |
431 | CORE_ADDR |
432 | frame_func_unwind (struct frame_info *fi) | |
433 | { | |
434 | if (!fi->prev_func.p) | |
435 | { | |
57bfe177 AC |
436 | /* Make certain that this, and not the adjacent, function is |
437 | found. */ | |
438 | CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi); | |
be41e9f4 | 439 | fi->prev_func.p = 1; |
57bfe177 | 440 | fi->prev_func.addr = get_pc_function_start (addr_in_block); |
7f78e237 AC |
441 | if (frame_debug) |
442 | fprintf_unfiltered (gdb_stdlog, | |
443 | "{ frame_func_unwind (fi=%d) -> 0x%s }\n", | |
444 | fi->level, paddr_nz (fi->prev_func.addr)); | |
be41e9f4 AC |
445 | } |
446 | return fi->prev_func.addr; | |
447 | } | |
448 | ||
449 | CORE_ADDR | |
450 | get_frame_func (struct frame_info *fi) | |
451 | { | |
452 | return frame_func_unwind (fi->next); | |
453 | } | |
454 | ||
7a25a7c1 AC |
455 | static int |
456 | do_frame_unwind_register (void *src, int regnum, void *buf) | |
457 | { | |
458 | frame_unwind_register (src, regnum, buf); | |
459 | return 1; | |
460 | } | |
461 | ||
dbe9fe58 | 462 | void |
7a25a7c1 AC |
463 | frame_pop (struct frame_info *this_frame) |
464 | { | |
465 | struct regcache *scratch_regcache; | |
466 | struct cleanup *cleanups; | |
467 | ||
749b82f6 | 468 | if (DEPRECATED_POP_FRAME_P ()) |
7a25a7c1 AC |
469 | { |
470 | /* A legacy architecture that has implemented a custom pop | |
471 | function. All new architectures should instead be using the | |
472 | generic code below. */ | |
749b82f6 | 473 | DEPRECATED_POP_FRAME; |
7a25a7c1 AC |
474 | } |
475 | else | |
476 | { | |
477 | /* Make a copy of all the register values unwound from this | |
478 | frame. Save them in a scratch buffer so that there isn't a | |
479 | race betweening trying to extract the old values from the | |
480 | current_regcache while, at the same time writing new values | |
481 | into that same cache. */ | |
482 | struct regcache *scratch = regcache_xmalloc (current_gdbarch); | |
483 | struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch); | |
484 | regcache_save (scratch, do_frame_unwind_register, this_frame); | |
efd710d6 AC |
485 | /* FIXME: cagney/2003-03-16: It should be possible to tell the |
486 | target's register cache that it is about to be hit with a | |
487 | burst register transfer and that the sequence of register | |
488 | writes should be batched. The pair target_prepare_to_store() | |
489 | and target_store_registers() kind of suggest this | |
ce2826aa | 490 | functionality. Unfortunately, they don't implement it. Their |
efd710d6 AC |
491 | lack of a formal definition can lead to targets writing back |
492 | bogus values (arguably a bug in the target code mind). */ | |
7a25a7c1 AC |
493 | /* Now copy those saved registers into the current regcache. |
494 | Here, regcache_cpy() calls regcache_restore(). */ | |
495 | regcache_cpy (current_regcache, scratch); | |
496 | do_cleanups (cleanups); | |
497 | } | |
498 | /* We've made right mess of GDB's local state, just discard | |
499 | everything. */ | |
dbe9fe58 AC |
500 | flush_cached_frames (); |
501 | } | |
c689142b | 502 | |
4f460812 AC |
503 | void |
504 | frame_register_unwind (struct frame_info *frame, int regnum, | |
505 | int *optimizedp, enum lval_type *lvalp, | |
506 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
507 | { | |
508 | struct frame_unwind_cache *cache; | |
509 | ||
7f78e237 AC |
510 | if (frame_debug) |
511 | { | |
6764ddad AC |
512 | fprintf_unfiltered (gdb_stdlog, "\ |
513 | { frame_register_unwind (frame=%d,regnum=%d(%s),...) ", | |
514 | frame->level, regnum, | |
515 | 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(). */ | |
c50901fd AC |
541 | frame->type = frame->unwind->type; |
542 | } | |
543 | ||
6dc42492 AC |
544 | /* Ask this frame to unwind its register. See comment in |
545 | "frame-unwind.h" for why NEXT frame and this unwind cace are | |
546 | passed in. */ | |
547 | frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum, | |
548 | optimizedp, lvalp, addrp, realnump, bufferp); | |
549 | ||
7f78e237 AC |
550 | if (frame_debug) |
551 | { | |
552 | fprintf_unfiltered (gdb_stdlog, "->"); | |
553 | fprintf_unfiltered (gdb_stdlog, " *optimizedp=%d", (*optimizedp)); | |
554 | fprintf_unfiltered (gdb_stdlog, " *lvalp=%d", (int) (*lvalp)); | |
555 | fprintf_unfiltered (gdb_stdlog, " *addrp=0x%s", paddr_nz ((*addrp))); | |
556 | fprintf_unfiltered (gdb_stdlog, " *bufferp="); | |
557 | if (bufferp == NULL) | |
558 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
559 | else | |
560 | { | |
561 | int i; | |
d2cf594a | 562 | const unsigned char *buf = bufferp; |
7f78e237 AC |
563 | fprintf_unfiltered (gdb_stdlog, "["); |
564 | for (i = 0; i < register_size (current_gdbarch, regnum); i++) | |
565 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); | |
566 | fprintf_unfiltered (gdb_stdlog, "]"); | |
567 | } | |
568 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
569 | } | |
4f460812 AC |
570 | } |
571 | ||
a216a322 AC |
572 | void |
573 | frame_register (struct frame_info *frame, int regnum, | |
574 | int *optimizedp, enum lval_type *lvalp, | |
575 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
576 | { | |
577 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates | |
578 | that the value proper does not need to be fetched. */ | |
579 | gdb_assert (optimizedp != NULL); | |
580 | gdb_assert (lvalp != NULL); | |
581 | gdb_assert (addrp != NULL); | |
582 | gdb_assert (realnump != NULL); | |
583 | /* gdb_assert (bufferp != NULL); */ | |
584 | ||
585 | /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset | |
586 | of the register in the register cache. It should instead return | |
587 | the REGNUM corresponding to that register. Translate the . */ | |
129c1cd6 | 588 | if (DEPRECATED_GET_SAVED_REGISTER_P ()) |
a216a322 | 589 | { |
129c1cd6 AC |
590 | DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame, |
591 | regnum, lvalp); | |
a216a322 AC |
592 | /* Compute the REALNUM if the caller wants it. */ |
593 | if (*lvalp == lval_register) | |
594 | { | |
595 | int regnum; | |
596 | for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++) | |
597 | { | |
598 | if (*addrp == register_offset_hack (current_gdbarch, regnum)) | |
599 | { | |
600 | *realnump = regnum; | |
601 | return; | |
602 | } | |
603 | } | |
604 | internal_error (__FILE__, __LINE__, | |
605 | "Failed to compute the register number corresponding" | |
606 | " to 0x%s", paddr_d (*addrp)); | |
607 | } | |
608 | *realnump = -1; | |
609 | return; | |
610 | } | |
611 | ||
a94dd1fd AC |
612 | /* Obtain the register value by unwinding the register from the next |
613 | (more inner frame). */ | |
614 | gdb_assert (frame != NULL && frame->next != NULL); | |
615 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
616 | realnump, bufferp); | |
a216a322 AC |
617 | } |
618 | ||
135c175f | 619 | void |
5b181d62 | 620 | frame_unwind_register (struct frame_info *frame, int regnum, void *buf) |
135c175f AC |
621 | { |
622 | int optimized; | |
623 | CORE_ADDR addr; | |
624 | int realnum; | |
625 | enum lval_type lval; | |
135c175f AC |
626 | frame_register_unwind (frame, regnum, &optimized, &lval, &addr, |
627 | &realnum, buf); | |
5b181d62 AC |
628 | } |
629 | ||
f0e7d0e8 AC |
630 | void |
631 | get_frame_register (struct frame_info *frame, | |
632 | int regnum, void *buf) | |
633 | { | |
634 | frame_unwind_register (frame->next, regnum, buf); | |
635 | } | |
636 | ||
637 | LONGEST | |
638 | frame_unwind_register_signed (struct frame_info *frame, int regnum) | |
639 | { | |
640 | char buf[MAX_REGISTER_SIZE]; | |
641 | frame_unwind_register (frame, regnum, buf); | |
f30992d4 | 642 | return extract_signed_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
f0e7d0e8 AC |
643 | } |
644 | ||
645 | LONGEST | |
646 | get_frame_register_signed (struct frame_info *frame, int regnum) | |
647 | { | |
648 | return frame_unwind_register_signed (frame->next, regnum); | |
649 | } | |
650 | ||
651 | ULONGEST | |
652 | frame_unwind_register_unsigned (struct frame_info *frame, int regnum) | |
653 | { | |
654 | char buf[MAX_REGISTER_SIZE]; | |
655 | frame_unwind_register (frame, regnum, buf); | |
f30992d4 | 656 | return extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
f0e7d0e8 AC |
657 | } |
658 | ||
659 | ULONGEST | |
660 | get_frame_register_unsigned (struct frame_info *frame, int regnum) | |
661 | { | |
662 | return frame_unwind_register_unsigned (frame->next, regnum); | |
663 | } | |
664 | ||
135c175f AC |
665 | void |
666 | frame_unwind_unsigned_register (struct frame_info *frame, int regnum, | |
667 | ULONGEST *val) | |
668 | { | |
d9d9c31f | 669 | char buf[MAX_REGISTER_SIZE]; |
5b181d62 | 670 | frame_unwind_register (frame, regnum, buf); |
f30992d4 | 671 | (*val) = extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
135c175f | 672 | } |
4f460812 | 673 | |
ff2e87ac AC |
674 | void |
675 | put_frame_register (struct frame_info *frame, int regnum, const void *buf) | |
676 | { | |
677 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
678 | int realnum; | |
679 | int optim; | |
680 | enum lval_type lval; | |
681 | CORE_ADDR addr; | |
682 | frame_register (frame, regnum, &optim, &lval, &addr, &realnum, NULL); | |
683 | if (optim) | |
684 | error ("Attempt to assign to a value that was optimized out."); | |
685 | switch (lval) | |
686 | { | |
687 | case lval_memory: | |
688 | { | |
689 | /* FIXME: write_memory doesn't yet take constant buffers. | |
690 | Arrrg! */ | |
691 | char tmp[MAX_REGISTER_SIZE]; | |
692 | memcpy (tmp, buf, register_size (gdbarch, regnum)); | |
693 | write_memory (addr, tmp, register_size (gdbarch, regnum)); | |
694 | break; | |
695 | } | |
696 | case lval_register: | |
697 | regcache_cooked_write (current_regcache, realnum, buf); | |
698 | break; | |
699 | default: | |
700 | error ("Attempt to assign to an unmodifiable value."); | |
701 | } | |
702 | } | |
703 | ||
cda5a58a | 704 | /* frame_register_read () |
d65fe839 | 705 | |
cda5a58a | 706 | Find and return the value of REGNUM for the specified stack frame. |
12c266ea AC |
707 | The number of bytes copied is DEPRECATED_REGISTER_RAW_SIZE |
708 | (REGNUM). | |
d65fe839 | 709 | |
cda5a58a | 710 | Returns 0 if the register value could not be found. */ |
d65fe839 | 711 | |
cda5a58a AC |
712 | int |
713 | frame_register_read (struct frame_info *frame, int regnum, void *myaddr) | |
d65fe839 | 714 | { |
a216a322 AC |
715 | int optimized; |
716 | enum lval_type lval; | |
717 | CORE_ADDR addr; | |
718 | int realnum; | |
719 | frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr); | |
d65fe839 | 720 | |
c97dcfc7 AC |
721 | /* FIXME: cagney/2002-05-15: This test, is just bogus. |
722 | ||
723 | It indicates that the target failed to supply a value for a | |
724 | register because it was "not available" at this time. Problem | |
725 | is, the target still has the register and so get saved_register() | |
726 | may be returning a value saved on the stack. */ | |
727 | ||
d65fe839 | 728 | if (register_cached (regnum) < 0) |
cda5a58a | 729 | return 0; /* register value not available */ |
d65fe839 | 730 | |
a216a322 | 731 | return !optimized; |
d65fe839 | 732 | } |
e36180d7 AC |
733 | |
734 | ||
735 | /* Map between a frame register number and its name. A frame register | |
736 | space is a superset of the cooked register space --- it also | |
737 | includes builtin registers. */ | |
738 | ||
739 | int | |
eb8bc282 | 740 | frame_map_name_to_regnum (struct frame_info *frame, const char *name, int len) |
e36180d7 | 741 | { |
eb8bc282 | 742 | return user_reg_map_name_to_regnum (get_frame_arch (frame), name, len); |
e36180d7 AC |
743 | } |
744 | ||
745 | const char * | |
eb8bc282 | 746 | frame_map_regnum_to_name (struct frame_info *frame, int regnum) |
e36180d7 | 747 | { |
eb8bc282 | 748 | return user_reg_map_regnum_to_name (get_frame_arch (frame), regnum); |
e36180d7 | 749 | } |
4c1e7e9d | 750 | |
a94dd1fd AC |
751 | /* Create a sentinel frame. */ |
752 | ||
b9362cc7 | 753 | static struct frame_info * |
a94dd1fd AC |
754 | create_sentinel_frame (struct regcache *regcache) |
755 | { | |
756 | struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
757 | frame->type = NORMAL_FRAME; | |
758 | frame->level = -1; | |
759 | /* Explicitly initialize the sentinel frame's cache. Provide it | |
760 | with the underlying regcache. In the future additional | |
761 | information, such as the frame's thread will be added. */ | |
6dc42492 | 762 | frame->prologue_cache = sentinel_frame_cache (regcache); |
a94dd1fd AC |
763 | /* For the moment there is only one sentinel frame implementation. */ |
764 | frame->unwind = sentinel_frame_unwind; | |
765 | /* Link this frame back to itself. The frame is self referential | |
766 | (the unwound PC is the same as the pc), so make it so. */ | |
767 | frame->next = frame; | |
50bbdbd9 AC |
768 | /* Make the sentinel frame's ID valid, but invalid. That way all |
769 | comparisons with it should fail. */ | |
d0a55772 AC |
770 | frame->this_id.p = 1; |
771 | frame->this_id.value = null_frame_id; | |
7f78e237 AC |
772 | if (frame_debug) |
773 | { | |
774 | fprintf_unfiltered (gdb_stdlog, "{ create_sentinel_frame (...) -> "); | |
775 | fprint_frame (gdb_stdlog, frame); | |
776 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
777 | } | |
a94dd1fd AC |
778 | return frame; |
779 | } | |
780 | ||
4c1e7e9d AC |
781 | /* Info about the innermost stack frame (contents of FP register) */ |
782 | ||
783 | static struct frame_info *current_frame; | |
784 | ||
785 | /* Cache for frame addresses already read by gdb. Valid only while | |
786 | inferior is stopped. Control variables for the frame cache should | |
787 | be local to this module. */ | |
788 | ||
789 | static struct obstack frame_cache_obstack; | |
790 | ||
791 | void * | |
479ab5a0 | 792 | frame_obstack_zalloc (unsigned long size) |
4c1e7e9d | 793 | { |
479ab5a0 AC |
794 | void *data = obstack_alloc (&frame_cache_obstack, size); |
795 | memset (data, 0, size); | |
796 | return data; | |
4c1e7e9d AC |
797 | } |
798 | ||
6baff1d2 | 799 | CORE_ADDR * |
4c1e7e9d AC |
800 | frame_saved_regs_zalloc (struct frame_info *fi) |
801 | { | |
802 | fi->saved_regs = (CORE_ADDR *) | |
479ab5a0 | 803 | frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); |
6baff1d2 | 804 | return fi->saved_regs; |
4c1e7e9d AC |
805 | } |
806 | ||
6baff1d2 | 807 | CORE_ADDR * |
1b1d3794 | 808 | deprecated_get_frame_saved_regs (struct frame_info *fi) |
6baff1d2 AC |
809 | { |
810 | return fi->saved_regs; | |
811 | } | |
4c1e7e9d | 812 | |
a94dd1fd AC |
813 | /* Return the innermost (currently executing) stack frame. This is |
814 | split into two functions. The function unwind_to_current_frame() | |
815 | is wrapped in catch exceptions so that, even when the unwind of the | |
816 | sentinel frame fails, the function still returns a stack frame. */ | |
817 | ||
818 | static int | |
819 | unwind_to_current_frame (struct ui_out *ui_out, void *args) | |
820 | { | |
821 | struct frame_info *frame = get_prev_frame (args); | |
822 | /* A sentinel frame can fail to unwind, eg, because it's PC value | |
823 | lands in somewhere like start. */ | |
824 | if (frame == NULL) | |
825 | return 1; | |
826 | current_frame = frame; | |
827 | return 0; | |
828 | } | |
4c1e7e9d AC |
829 | |
830 | struct frame_info * | |
831 | get_current_frame (void) | |
832 | { | |
0a1e1ca1 AC |
833 | /* First check, and report, the lack of registers. Having GDB |
834 | report "No stack!" or "No memory" when the target doesn't even | |
835 | have registers is very confusing. Besides, "printcmd.exp" | |
836 | explicitly checks that ``print $pc'' with no registers prints "No | |
837 | registers". */ | |
a94dd1fd AC |
838 | if (!target_has_registers) |
839 | error ("No registers."); | |
0a1e1ca1 AC |
840 | if (!target_has_stack) |
841 | error ("No stack."); | |
a94dd1fd AC |
842 | if (!target_has_memory) |
843 | error ("No memory."); | |
4c1e7e9d AC |
844 | if (current_frame == NULL) |
845 | { | |
a94dd1fd AC |
846 | struct frame_info *sentinel_frame = |
847 | create_sentinel_frame (current_regcache); | |
848 | if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame, | |
849 | NULL, RETURN_MASK_ERROR) != 0) | |
850 | { | |
851 | /* Oops! Fake a current frame? Is this useful? It has a PC | |
852 | of zero, for instance. */ | |
853 | current_frame = sentinel_frame; | |
854 | } | |
4c1e7e9d AC |
855 | } |
856 | return current_frame; | |
857 | } | |
858 | ||
6e7f8b9c AC |
859 | /* The "selected" stack frame is used by default for local and arg |
860 | access. May be zero, for no selected frame. */ | |
861 | ||
862 | struct frame_info *deprecated_selected_frame; | |
863 | ||
864 | /* Return the selected frame. Always non-null (unless there isn't an | |
865 | inferior sufficient for creating a frame) in which case an error is | |
866 | thrown. */ | |
867 | ||
868 | struct frame_info * | |
869 | get_selected_frame (void) | |
870 | { | |
871 | if (deprecated_selected_frame == NULL) | |
872 | /* Hey! Don't trust this. It should really be re-finding the | |
873 | last selected frame of the currently selected thread. This, | |
874 | though, is better than nothing. */ | |
875 | select_frame (get_current_frame ()); | |
876 | /* There is always a frame. */ | |
877 | gdb_assert (deprecated_selected_frame != NULL); | |
878 | return deprecated_selected_frame; | |
879 | } | |
880 | ||
7dd88986 DJ |
881 | /* This is a variant of get_selected_frame which can be called when |
882 | the inferior does not have a frame; in that case it will return | |
883 | NULL instead of calling error (). */ | |
884 | ||
885 | struct frame_info * | |
886 | deprecated_safe_get_selected_frame (void) | |
887 | { | |
888 | if (!target_has_registers || !target_has_stack || !target_has_memory) | |
889 | return NULL; | |
890 | return get_selected_frame (); | |
891 | } | |
892 | ||
6e7f8b9c AC |
893 | /* Select frame FI (or NULL - to invalidate the current frame). */ |
894 | ||
895 | void | |
896 | select_frame (struct frame_info *fi) | |
897 | { | |
52f0bd74 | 898 | struct symtab *s; |
6e7f8b9c AC |
899 | |
900 | deprecated_selected_frame = fi; | |
901 | /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the | |
902 | frame is being invalidated. */ | |
903 | if (selected_frame_level_changed_hook) | |
904 | selected_frame_level_changed_hook (frame_relative_level (fi)); | |
905 | ||
906 | /* FIXME: kseitz/2002-08-28: It would be nice to call | |
907 | selected_frame_level_changed_event right here, but due to limitations | |
908 | in the current interfaces, we would end up flooding UIs with events | |
909 | because select_frame is used extensively internally. | |
910 | ||
911 | Once we have frame-parameterized frame (and frame-related) commands, | |
912 | the event notification can be moved here, since this function will only | |
913 | be called when the users selected frame is being changed. */ | |
914 | ||
915 | /* Ensure that symbols for this frame are read in. Also, determine the | |
916 | source language of this frame, and switch to it if desired. */ | |
917 | if (fi) | |
918 | { | |
7ae4c3a5 JB |
919 | /* We retrieve the frame's symtab by using the frame PC. However |
920 | we cannot use the frame pc as is, because it usually points to | |
921 | the instruction following the "call", which is sometimes the | |
922 | first instruction of another function. So we rely on | |
923 | get_frame_address_in_block() which provides us with a PC which | |
924 | is guaranteed to be inside the frame's code block. */ | |
925 | s = find_pc_symtab (get_frame_address_in_block (fi)); | |
6e7f8b9c AC |
926 | if (s |
927 | && s->language != current_language->la_language | |
928 | && s->language != language_unknown | |
929 | && language_mode == language_mode_auto) | |
930 | { | |
931 | set_language (s->language); | |
932 | } | |
933 | } | |
934 | } | |
935 | ||
4c1e7e9d AC |
936 | /* Return the register saved in the simplistic ``saved_regs'' cache. |
937 | If the value isn't here AND a value is needed, try the next inner | |
938 | most frame. */ | |
939 | ||
940 | static void | |
6dc42492 AC |
941 | legacy_saved_regs_prev_register (struct frame_info *next_frame, |
942 | void **this_prologue_cache, | |
943 | int regnum, int *optimizedp, | |
944 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
945 | int *realnump, void *bufferp) | |
4c1e7e9d | 946 | { |
6dc42492 | 947 | /* HACK: New code is passed the next frame and this cache. |
ce2826aa | 948 | Unfortunately, old code expects this frame. Since this is a |
6dc42492 AC |
949 | backward compatibility hack, cheat by walking one level along the |
950 | prologue chain to the frame the old code expects. | |
951 | ||
952 | Do not try this at home. Professional driver, closed course. */ | |
953 | struct frame_info *frame = next_frame->prev; | |
4c1e7e9d | 954 | gdb_assert (frame != NULL); |
4c1e7e9d | 955 | |
1b1d3794 | 956 | if (deprecated_get_frame_saved_regs (frame) == NULL) |
870b3035 AC |
957 | { |
958 | /* If nothing's initialized the saved regs, do it now. */ | |
959 | gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()); | |
960 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); | |
1b1d3794 | 961 | gdb_assert (deprecated_get_frame_saved_regs (frame) != NULL); |
870b3035 | 962 | } |
4c1e7e9d | 963 | |
1b1d3794 AC |
964 | if (deprecated_get_frame_saved_regs (frame) != NULL |
965 | && deprecated_get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d AC |
966 | { |
967 | if (regnum == SP_REGNUM) | |
968 | { | |
969 | /* SP register treated specially. */ | |
970 | *optimizedp = 0; | |
971 | *lvalp = not_lval; | |
972 | *addrp = 0; | |
973 | *realnump = -1; | |
974 | if (bufferp != NULL) | |
fbd9dcd3 AC |
975 | /* NOTE: cagney/2003-05-09: In-lined store_address with |
976 | it's body - store_unsigned_integer. */ | |
12c266ea | 977 | store_unsigned_integer (bufferp, DEPRECATED_REGISTER_RAW_SIZE (regnum), |
1b1d3794 | 978 | deprecated_get_frame_saved_regs (frame)[regnum]); |
4c1e7e9d AC |
979 | } |
980 | else | |
981 | { | |
982 | /* Any other register is saved in memory, fetch it but cache | |
983 | a local copy of its value. */ | |
984 | *optimizedp = 0; | |
985 | *lvalp = lval_memory; | |
1b1d3794 | 986 | *addrp = deprecated_get_frame_saved_regs (frame)[regnum]; |
4c1e7e9d AC |
987 | *realnump = -1; |
988 | if (bufferp != NULL) | |
989 | { | |
990 | #if 1 | |
991 | /* Save each register value, as it is read in, in a | |
992 | frame based cache. */ | |
6dc42492 | 993 | void **regs = (*this_prologue_cache); |
4c1e7e9d AC |
994 | if (regs == NULL) |
995 | { | |
996 | int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS) | |
997 | * sizeof (void *)); | |
479ab5a0 | 998 | regs = frame_obstack_zalloc (sizeof_cache); |
6dc42492 | 999 | (*this_prologue_cache) = regs; |
4c1e7e9d AC |
1000 | } |
1001 | if (regs[regnum] == NULL) | |
1002 | { | |
1003 | regs[regnum] | |
12c266ea | 1004 | = frame_obstack_zalloc (DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
1b1d3794 | 1005 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], regs[regnum], |
12c266ea | 1006 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d | 1007 | } |
12c266ea | 1008 | memcpy (bufferp, regs[regnum], DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
1009 | #else |
1010 | /* Read the value in from memory. */ | |
1b1d3794 | 1011 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], bufferp, |
12c266ea | 1012 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
1013 | #endif |
1014 | } | |
1015 | } | |
1016 | return; | |
1017 | } | |
1018 | ||
6dc42492 AC |
1019 | /* No luck. Assume this and the next frame have the same register |
1020 | value. Pass the unwind request down the frame chain to the next | |
1021 | frame. Hopefully that frame will find the register's location. */ | |
1022 | frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp, | |
1023 | realnump, bufferp); | |
4c1e7e9d AC |
1024 | } |
1025 | ||
c170fb60 | 1026 | static void |
6dc42492 AC |
1027 | legacy_saved_regs_this_id (struct frame_info *next_frame, |
1028 | void **this_prologue_cache, | |
1029 | struct frame_id *id) | |
c689142b | 1030 | { |
1152e35e AC |
1031 | /* A developer is trying to bring up a new architecture, help them |
1032 | by providing a default unwinder that refuses to unwind anything | |
1033 | (the ID is always NULL). In the case of legacy code, | |
1034 | legacy_get_prev_frame() will have previously set ->this_id.p, so | |
1035 | this code won't be called. */ | |
1036 | (*id) = null_frame_id; | |
c689142b AC |
1037 | } |
1038 | ||
6dc42492 | 1039 | const struct frame_unwind legacy_saved_regs_unwinder = { |
7df05f2b AC |
1040 | /* Not really. It gets overridden by legacy_get_prev_frame. */ |
1041 | UNKNOWN_FRAME, | |
6dc42492 AC |
1042 | legacy_saved_regs_this_id, |
1043 | legacy_saved_regs_prev_register | |
494cca16 | 1044 | }; |
6dc42492 | 1045 | const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder; |
494cca16 AC |
1046 | |
1047 | ||
ac2adee5 | 1048 | /* Function: deprecated_generic_get_saved_register |
4c1e7e9d | 1049 | Find register number REGNUM relative to FRAME and put its (raw, |
ac2adee5 | 1050 | target format) contents in *RAW_BUFFER. |
4c1e7e9d AC |
1051 | |
1052 | Set *OPTIMIZED if the variable was optimized out (and thus can't be | |
1053 | fetched). Note that this is never set to anything other than zero | |
1054 | in this implementation. | |
1055 | ||
1056 | Set *LVAL to lval_memory, lval_register, or not_lval, depending on | |
1057 | whether the value was fetched from memory, from a register, or in a | |
1058 | strange and non-modifiable way (e.g. a frame pointer which was | |
1059 | calculated rather than fetched). We will use not_lval for values | |
1060 | fetched from generic dummy frames. | |
1061 | ||
62700349 AC |
1062 | Set *ADDRP to the address, either in memory or as a |
1063 | DEPRECATED_REGISTER_BYTE offset into the registers array. If the | |
1064 | value is stored in a dummy frame, set *ADDRP to zero. | |
4c1e7e9d | 1065 | |
4c1e7e9d AC |
1066 | The argument RAW_BUFFER must point to aligned memory. */ |
1067 | ||
1068 | void | |
1069 | deprecated_generic_get_saved_register (char *raw_buffer, int *optimized, | |
1070 | CORE_ADDR *addrp, | |
1071 | struct frame_info *frame, int regnum, | |
1072 | enum lval_type *lval) | |
1073 | { | |
1074 | if (!target_has_registers) | |
1075 | error ("No registers."); | |
1076 | ||
1077 | /* Normal systems don't optimize out things with register numbers. */ | |
1078 | if (optimized != NULL) | |
1079 | *optimized = 0; | |
1080 | ||
1081 | if (addrp) /* default assumption: not found in memory */ | |
1082 | *addrp = 0; | |
1083 | ||
1084 | /* Note: since the current frame's registers could only have been | |
1085 | saved by frames INTERIOR TO the current frame, we skip examining | |
1086 | the current frame itself: otherwise, we would be getting the | |
1087 | previous frame's registers which were saved by the current frame. */ | |
1088 | ||
a94dd1fd | 1089 | if (frame != NULL) |
4c1e7e9d | 1090 | { |
a94dd1fd AC |
1091 | for (frame = get_next_frame (frame); |
1092 | frame_relative_level (frame) >= 0; | |
1093 | frame = get_next_frame (frame)) | |
4c1e7e9d | 1094 | { |
a94dd1fd | 1095 | if (get_frame_type (frame) == DUMMY_FRAME) |
4c1e7e9d | 1096 | { |
a94dd1fd AC |
1097 | if (lval) /* found it in a CALL_DUMMY frame */ |
1098 | *lval = not_lval; | |
1099 | if (raw_buffer) | |
1100 | /* FIXME: cagney/2002-06-26: This should be via the | |
1101 | gdbarch_register_read() method so that it, on the | |
1102 | fly, constructs either a raw or pseudo register | |
1103 | from the raw register cache. */ | |
1104 | regcache_raw_read | |
cc8c88f3 AC |
1105 | (deprecated_find_dummy_frame_regcache (get_frame_pc (frame), |
1106 | get_frame_base (frame)), | |
a94dd1fd AC |
1107 | regnum, raw_buffer); |
1108 | return; | |
4c1e7e9d | 1109 | } |
a94dd1fd | 1110 | |
f30ee0bc | 1111 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); |
1b1d3794 AC |
1112 | if (deprecated_get_frame_saved_regs (frame) != NULL |
1113 | && deprecated_get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d | 1114 | { |
a94dd1fd AC |
1115 | if (lval) /* found it saved on the stack */ |
1116 | *lval = lval_memory; | |
1117 | if (regnum == SP_REGNUM) | |
1118 | { | |
1119 | if (raw_buffer) /* SP register treated specially */ | |
fbd9dcd3 AC |
1120 | /* NOTE: cagney/2003-05-09: In-line store_address |
1121 | with it's body - store_unsigned_integer. */ | |
1122 | store_unsigned_integer (raw_buffer, | |
12c266ea | 1123 | DEPRECATED_REGISTER_RAW_SIZE (regnum), |
1b1d3794 | 1124 | deprecated_get_frame_saved_regs (frame)[regnum]); |
a94dd1fd AC |
1125 | } |
1126 | else | |
1127 | { | |
1128 | if (addrp) /* any other register */ | |
1b1d3794 | 1129 | *addrp = deprecated_get_frame_saved_regs (frame)[regnum]; |
a94dd1fd | 1130 | if (raw_buffer) |
1b1d3794 | 1131 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], raw_buffer, |
12c266ea | 1132 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
a94dd1fd AC |
1133 | } |
1134 | return; | |
4c1e7e9d | 1135 | } |
4c1e7e9d AC |
1136 | } |
1137 | } | |
1138 | ||
1139 | /* If we get thru the loop to this point, it means the register was | |
1140 | not saved in any frame. Return the actual live-register value. */ | |
1141 | ||
1142 | if (lval) /* found it in a live register */ | |
1143 | *lval = lval_register; | |
1144 | if (addrp) | |
62700349 | 1145 | *addrp = DEPRECATED_REGISTER_BYTE (regnum); |
4c1e7e9d AC |
1146 | if (raw_buffer) |
1147 | deprecated_read_register_gen (regnum, raw_buffer); | |
1148 | } | |
1149 | ||
eb4f72c5 AC |
1150 | /* Determine the frame's type based on its PC. */ |
1151 | ||
1152 | static enum frame_type | |
1153 | frame_type_from_pc (CORE_ADDR pc) | |
1154 | { | |
1155 | /* FIXME: cagney/2002-11-24: Can't yet directly call | |
1156 | pc_in_dummy_frame() as some architectures don't set | |
1157 | PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the | |
1158 | latter is implemented by simply calling pc_in_dummy_frame). */ | |
1159 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES | |
1160 | && DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) | |
1161 | return DUMMY_FRAME; | |
1162 | else | |
1163 | { | |
1164 | char *name; | |
1165 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1166 | if (PC_IN_SIGTRAMP (pc, name)) | |
1167 | return SIGTRAMP_FRAME; | |
1168 | else | |
1169 | return NORMAL_FRAME; | |
1170 | } | |
1171 | } | |
1172 | ||
4c1e7e9d AC |
1173 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. |
1174 | Always returns a non-NULL value. */ | |
1175 | ||
1176 | struct frame_info * | |
1177 | create_new_frame (CORE_ADDR addr, CORE_ADDR pc) | |
1178 | { | |
1179 | struct frame_info *fi; | |
4c1e7e9d | 1180 | |
7f78e237 AC |
1181 | if (frame_debug) |
1182 | { | |
1183 | fprintf_unfiltered (gdb_stdlog, | |
1184 | "{ create_new_frame (addr=0x%s, pc=0x%s) ", | |
1185 | paddr_nz (addr), paddr_nz (pc)); | |
1186 | } | |
1187 | ||
479ab5a0 | 1188 | fi = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d | 1189 | |
a94dd1fd | 1190 | fi->next = create_sentinel_frame (current_regcache); |
7df05f2b AC |
1191 | |
1192 | /* Select/initialize both the unwind function and the frame's type | |
1193 | based on the PC. */ | |
e8a89fe2 | 1194 | fi->unwind = frame_unwind_find_by_frame (fi->next); |
7df05f2b AC |
1195 | if (fi->unwind->type != UNKNOWN_FRAME) |
1196 | fi->type = fi->unwind->type; | |
1197 | else | |
1198 | fi->type = frame_type_from_pc (pc); | |
1199 | ||
18adea3f | 1200 | fi->this_id.p = 1; |
11889732 AC |
1201 | deprecated_update_frame_base_hack (fi, addr); |
1202 | deprecated_update_frame_pc_hack (fi, pc); | |
4c1e7e9d | 1203 | |
e9582e71 AC |
1204 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1205 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi); | |
4c1e7e9d | 1206 | |
7f78e237 AC |
1207 | if (frame_debug) |
1208 | { | |
1209 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1210 | fprint_frame (gdb_stdlog, fi); | |
1211 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1212 | } | |
1213 | ||
4c1e7e9d AC |
1214 | return fi; |
1215 | } | |
1216 | ||
03febf99 AC |
1217 | /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the |
1218 | innermost frame). Be careful to not fall off the bottom of the | |
1219 | frame chain and onto the sentinel frame. */ | |
4c1e7e9d AC |
1220 | |
1221 | struct frame_info * | |
03febf99 | 1222 | get_next_frame (struct frame_info *this_frame) |
4c1e7e9d | 1223 | { |
03febf99 AC |
1224 | if (this_frame->level > 0) |
1225 | return this_frame->next; | |
a94dd1fd AC |
1226 | else |
1227 | return NULL; | |
4c1e7e9d AC |
1228 | } |
1229 | ||
870b3035 AC |
1230 | struct frame_info * |
1231 | deprecated_get_next_frame_hack (struct frame_info *this_frame) | |
1232 | { | |
1233 | return this_frame->next; | |
1234 | } | |
1235 | ||
4c1e7e9d AC |
1236 | /* Flush the entire frame cache. */ |
1237 | ||
1238 | void | |
1239 | flush_cached_frames (void) | |
1240 | { | |
1241 | /* Since we can't really be sure what the first object allocated was */ | |
1242 | obstack_free (&frame_cache_obstack, 0); | |
1243 | obstack_init (&frame_cache_obstack); | |
1244 | ||
1245 | current_frame = NULL; /* Invalidate cache */ | |
1246 | select_frame (NULL); | |
1247 | annotate_frames_invalid (); | |
7f78e237 AC |
1248 | if (frame_debug) |
1249 | fprintf_unfiltered (gdb_stdlog, "{ flush_cached_frames () }\n"); | |
4c1e7e9d AC |
1250 | } |
1251 | ||
1252 | /* Flush the frame cache, and start a new one if necessary. */ | |
1253 | ||
1254 | void | |
1255 | reinit_frame_cache (void) | |
1256 | { | |
1257 | flush_cached_frames (); | |
1258 | ||
1259 | /* FIXME: The inferior_ptid test is wrong if there is a corefile. */ | |
1260 | if (PIDGET (inferior_ptid) != 0) | |
1261 | { | |
1262 | select_frame (get_current_frame ()); | |
1263 | } | |
1264 | } | |
1265 | ||
eb4f72c5 AC |
1266 | /* Create the previous frame using the deprecated methods |
1267 | INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */ | |
4c1e7e9d | 1268 | |
eb4f72c5 | 1269 | static struct frame_info * |
03febf99 | 1270 | legacy_get_prev_frame (struct frame_info *this_frame) |
4c1e7e9d AC |
1271 | { |
1272 | CORE_ADDR address = 0; | |
1273 | struct frame_info *prev; | |
95adb866 | 1274 | int fromleaf; |
4c1e7e9d | 1275 | |
7f78e237 AC |
1276 | /* Don't frame_debug print legacy_get_prev_frame() here, just |
1277 | confuses the output. */ | |
1278 | ||
a01dd7cc | 1279 | /* Allocate the new frame. |
055bb976 AC |
1280 | |
1281 | There is no reason to worry about memory leaks, should the | |
1282 | remainder of the function fail. The allocated memory will be | |
1283 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1284 | been here before' check, in get_prev_frame will stop repeated | |
1285 | memory allocation calls. */ | |
1286 | prev = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
1287 | prev->level = this_frame->level + 1; | |
1288 | ||
9564ee9f | 1289 | /* Do not completely wire it in to the frame chain. Some (bad) code |
a01dd7cc AC |
1290 | in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull |
1291 | some fancy tricks (of course such code is, by definition, | |
1292 | recursive). | |
1293 | ||
1294 | On the other hand, methods, such as get_frame_pc() and | |
1295 | get_frame_base() rely on being able to walk along the frame | |
1296 | chain. Make certain that at least they work by providing that | |
1297 | link. Of course things manipulating prev can't go back. */ | |
1298 | prev->next = this_frame; | |
1299 | ||
055bb976 AC |
1300 | /* NOTE: cagney/2002-11-18: Should have been correctly setting the |
1301 | frame's type here, before anything else, and not last, at the | |
1302 | bottom of this function. The various | |
1303 | DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC, | |
1304 | DEPRECATED_INIT_FRAME_PC_FIRST and | |
1305 | DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds | |
1306 | that handle the frame not being correctly set from the start. | |
ce2826aa | 1307 | Unfortunately those same work-arounds rely on the type defaulting |
055bb976 AC |
1308 | to NORMAL_FRAME. Ulgh! The new frame code does not have this |
1309 | problem. */ | |
7df05f2b | 1310 | prev->type = UNKNOWN_FRAME; |
055bb976 | 1311 | |
06c77151 | 1312 | /* A legacy frame's ID is always computed here. Mark it as valid. */ |
d0a55772 | 1313 | prev->this_id.p = 1; |
06c77151 | 1314 | |
055bb976 AC |
1315 | /* Handle sentinel frame unwind as a special case. */ |
1316 | if (this_frame->level < 0) | |
1317 | { | |
1318 | /* Try to unwind the PC. If that doesn't work, assume we've reached | |
1319 | the oldest frame and simply return. Is there a better sentinal | |
1320 | value? The unwound PC value is then used to initialize the new | |
1321 | previous frame's type. | |
1322 | ||
1323 | Note that the pc-unwind is intentionally performed before the | |
1324 | frame chain. This is ok since, for old targets, both | |
618ce49f AC |
1325 | frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and |
1326 | DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures | |
1327 | have already been initialized (using | |
055bb976 AC |
1328 | DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order |
1329 | doesn't matter. | |
1330 | ||
1331 | By unwinding the PC first, it becomes possible to, in the case of | |
1332 | a dummy frame, avoid also unwinding the frame ID. This is | |
1333 | because (well ignoring the PPC) a dummy frame can be located | |
1334 | using THIS_FRAME's frame ID. */ | |
1335 | ||
11889732 AC |
1336 | deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame)); |
1337 | if (get_frame_pc (prev) == 0) | |
055bb976 AC |
1338 | { |
1339 | /* The allocated PREV_FRAME will be reclaimed when the frame | |
1340 | obstack is next purged. */ | |
1341 | if (frame_debug) | |
7f78e237 AC |
1342 | { |
1343 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1344 | fprint_frame (gdb_stdlog, NULL); | |
1345 | fprintf_unfiltered (gdb_stdlog, | |
1346 | " // unwound legacy PC zero }\n"); | |
1347 | } | |
055bb976 AC |
1348 | return NULL; |
1349 | } | |
055bb976 | 1350 | |
7df05f2b AC |
1351 | /* Set the unwind functions based on that identified PC. Ditto |
1352 | for the "type" but strongly prefer the unwinder's frame type. */ | |
e8a89fe2 | 1353 | prev->unwind = frame_unwind_find_by_frame (prev->next); |
7df05f2b | 1354 | if (prev->unwind->type == UNKNOWN_FRAME) |
d1340264 | 1355 | prev->type = frame_type_from_pc (get_frame_pc (prev)); |
7df05f2b AC |
1356 | else |
1357 | prev->type = prev->unwind->type; | |
055bb976 AC |
1358 | |
1359 | /* Find the prev's frame's ID. */ | |
1360 | if (prev->type == DUMMY_FRAME | |
1361 | && gdbarch_unwind_dummy_id_p (current_gdbarch)) | |
1362 | { | |
1363 | /* When unwinding a normal frame, the stack structure is | |
1364 | determined by analyzing the frame's function's code (be | |
1365 | it using brute force prologue analysis, or the dwarf2 | |
1366 | CFI). In the case of a dummy frame, that simply isn't | |
1367 | possible. The The PC is either the program entry point, | |
1368 | or some random address on the stack. Trying to use that | |
1369 | PC to apply standard frame ID unwind techniques is just | |
1370 | asking for trouble. */ | |
055bb976 AC |
1371 | /* Use an architecture specific method to extract the prev's |
1372 | dummy ID from the next frame. Note that this method uses | |
1373 | frame_register_unwind to obtain the register values | |
1374 | needed to determine the dummy frame's ID. */ | |
d0a55772 AC |
1375 | prev->this_id.value = gdbarch_unwind_dummy_id (current_gdbarch, |
1376 | this_frame); | |
055bb976 AC |
1377 | } |
1378 | else | |
1379 | { | |
1380 | /* We're unwinding a sentinel frame, the PC of which is | |
1381 | pointing at a stack dummy. Fake up the dummy frame's ID | |
1382 | using the same sequence as is found a traditional | |
1383 | unwinder. Once all architectures supply the | |
1384 | unwind_dummy_id method, this code can go away. */ | |
0ba6dca9 AC |
1385 | prev->this_id.value = frame_id_build (deprecated_read_fp (), |
1386 | read_pc ()); | |
055bb976 AC |
1387 | } |
1388 | ||
1389 | /* Check that the unwound ID is valid. */ | |
d0a55772 | 1390 | if (!frame_id_p (prev->this_id.value)) |
055bb976 AC |
1391 | { |
1392 | if (frame_debug) | |
7f78e237 AC |
1393 | { |
1394 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1395 | fprint_frame (gdb_stdlog, NULL); | |
1396 | fprintf_unfiltered (gdb_stdlog, | |
1397 | " // unwound legacy ID invalid }\n"); | |
1398 | } | |
055bb976 AC |
1399 | return NULL; |
1400 | } | |
1401 | ||
1402 | /* Check that the new frame isn't inner to (younger, below, | |
1403 | next) the old frame. If that happens the frame unwind is | |
1404 | going backwards. */ | |
1405 | /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since | |
1406 | that doesn't have a valid frame ID. Should instead set the | |
1407 | sentinel frame's frame ID to a `sentinel'. Leave it until | |
1408 | after the switch to storing the frame ID, instead of the | |
1409 | frame base, in the frame object. */ | |
1410 | ||
055bb976 AC |
1411 | /* Link it in. */ |
1412 | this_frame->prev = prev; | |
055bb976 AC |
1413 | |
1414 | /* FIXME: cagney/2002-01-19: This call will go away. Instead of | |
1415 | initializing extra info, all frames will use the frame_cache | |
1416 | (passed to the unwind functions) to store additional frame | |
ce2826aa | 1417 | info. Unfortunately legacy targets can't use |
055bb976 AC |
1418 | legacy_get_prev_frame() to unwind the sentinel frame and, |
1419 | consequently, are forced to take this code path and rely on | |
1420 | the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to | |
1421 | initialize the inner-most frame. */ | |
1422 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) | |
1423 | { | |
1424 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev); | |
1425 | } | |
18adea3f AC |
1426 | |
1427 | if (prev->type == NORMAL_FRAME) | |
1428 | prev->this_id.value.code_addr | |
1429 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1430 | ||
7f78e237 AC |
1431 | if (frame_debug) |
1432 | { | |
1433 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1434 | fprint_frame (gdb_stdlog, prev); | |
1435 | fprintf_unfiltered (gdb_stdlog, " } // legacy innermost frame\n"); | |
1436 | } | |
055bb976 AC |
1437 | return prev; |
1438 | } | |
1439 | ||
eb4f72c5 AC |
1440 | /* This code only works on normal frames. A sentinel frame, where |
1441 | the level is -1, should never reach this code. */ | |
03febf99 | 1442 | gdb_assert (this_frame->level >= 0); |
4c1e7e9d AC |
1443 | |
1444 | /* On some machines it is possible to call a function without | |
1445 | setting up a stack frame for it. On these machines, we | |
1446 | define this macro to take two args; a frameinfo pointer | |
1447 | identifying a frame and a variable to set or clear if it is | |
1448 | or isn't leafless. */ | |
1449 | ||
1450 | /* Still don't want to worry about this except on the innermost | |
03febf99 | 1451 | frame. This macro will set FROMLEAF if THIS_FRAME is a frameless |
95adb866 | 1452 | function invocation. */ |
03febf99 | 1453 | if (this_frame->level == 0) |
95adb866 AC |
1454 | /* FIXME: 2002-11-09: Frameless functions can occure anywhere in |
1455 | the frame chain, not just the inner most frame! The generic, | |
1456 | per-architecture, frame code should handle this and the below | |
1457 | should simply be removed. */ | |
03febf99 | 1458 | fromleaf = FRAMELESS_FUNCTION_INVOCATION (this_frame); |
95adb866 AC |
1459 | else |
1460 | fromleaf = 0; | |
1461 | ||
1462 | if (fromleaf) | |
1463 | /* A frameless inner-most frame. The `FP' (which isn't an | |
1464 | architecture frame-pointer register!) of the caller is the same | |
1465 | as the callee. */ | |
1466 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
1467 | edge condition. Instead the per-architecture code should hande | |
1468 | it locally. */ | |
870b3035 AC |
1469 | /* FIXME: cagney/2003-06-16: This returns the inner most stack |
1470 | address for the previous frame, that, however, is wrong. It | |
1471 | should be the inner most stack address for the previous to | |
1472 | previous frame. This is because it is the previous to previous | |
1473 | frame's innermost stack address that is constant through out | |
1474 | the lifetime of the previous frame (trust me :-). */ | |
03febf99 | 1475 | address = get_frame_base (this_frame); |
95adb866 | 1476 | else |
4c1e7e9d AC |
1477 | { |
1478 | /* Two macros defined in tm.h specify the machine-dependent | |
1479 | actions to be performed here. | |
95adb866 | 1480 | |
4c1e7e9d | 1481 | First, get the frame's chain-pointer. |
95adb866 | 1482 | |
4c1e7e9d AC |
1483 | If that is zero, the frame is the outermost frame or a leaf |
1484 | called by the outermost frame. This means that if start | |
1485 | calls main without a frame, we'll return 0 (which is fine | |
1486 | anyway). | |
1487 | ||
1488 | Nope; there's a problem. This also returns when the current | |
1489 | routine is a leaf of main. This is unacceptable. We move | |
1490 | this to after the ffi test; I'd rather have backtraces from | |
1491 | start go curfluy than have an abort called from main not show | |
1492 | main. */ | |
870b3035 AC |
1493 | if (DEPRECATED_FRAME_CHAIN_P ()) |
1494 | address = DEPRECATED_FRAME_CHAIN (this_frame); | |
1495 | else | |
1496 | { | |
1497 | /* Someone is part way through coverting an old architecture | |
1498 | to the new frame code. Implement FRAME_CHAIN the way the | |
1499 | new frame will. */ | |
1500 | /* Find PREV frame's unwinder. */ | |
e8a89fe2 | 1501 | prev->unwind = frame_unwind_find_by_frame (this_frame->next); |
870b3035 AC |
1502 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
1503 | type in the frame, the unwinder's type should be returned | |
ce2826aa | 1504 | directly. Unfortunately, legacy code, called by |
870b3035 AC |
1505 | legacy_get_prev_frame, explicitly set the frames type |
1506 | using the method deprecated_set_frame_type(). */ | |
1507 | prev->type = prev->unwind->type; | |
1508 | /* Find PREV frame's ID. */ | |
1509 | prev->unwind->this_id (this_frame, | |
1510 | &prev->prologue_cache, | |
1511 | &prev->this_id.value); | |
1512 | prev->this_id.p = 1; | |
1513 | address = prev->this_id.value.stack_addr; | |
1514 | } | |
4c1e7e9d | 1515 | |
e6ba3bc9 | 1516 | if (!legacy_frame_chain_valid (address, this_frame)) |
7f78e237 AC |
1517 | { |
1518 | if (frame_debug) | |
1519 | { | |
1520 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1521 | fprint_frame (gdb_stdlog, NULL); | |
1522 | fprintf_unfiltered (gdb_stdlog, | |
1523 | " // legacy frame chain invalid }\n"); | |
1524 | } | |
1525 | return NULL; | |
1526 | } | |
4c1e7e9d AC |
1527 | } |
1528 | if (address == 0) | |
7f78e237 AC |
1529 | { |
1530 | if (frame_debug) | |
1531 | { | |
1532 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1533 | fprint_frame (gdb_stdlog, NULL); | |
1534 | fprintf_unfiltered (gdb_stdlog, | |
1535 | " // legacy frame chain NULL }\n"); | |
1536 | } | |
1537 | return NULL; | |
1538 | } | |
4c1e7e9d | 1539 | |
055bb976 | 1540 | /* Link in the already allocated prev frame. */ |
03febf99 | 1541 | this_frame->prev = prev; |
11889732 | 1542 | deprecated_update_frame_base_hack (prev, address); |
4c1e7e9d | 1543 | |
95adb866 | 1544 | /* This change should not be needed, FIXME! We should determine |
a5afb99f | 1545 | whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen |
e9582e71 AC |
1546 | after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple |
1547 | way to express what goes on here. | |
95adb866 | 1548 | |
e9582e71 AC |
1549 | DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places: |
1550 | create_new_frame (where the PC is already set up) and here (where | |
1551 | it isn't). DEPRECATED_INIT_FRAME_PC is only called from here, | |
1552 | always after DEPRECATED_INIT_EXTRA_FRAME_INFO. | |
95adb866 | 1553 | |
e9582e71 AC |
1554 | The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO |
1555 | requires the PC value (which hasn't been set yet). Some other | |
1556 | machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO | |
1557 | before they can do DEPRECATED_INIT_FRAME_PC. Phoo. | |
95adb866 | 1558 | |
2ca6c561 AC |
1559 | We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more |
1560 | complication to an already overcomplicated part of GDB. | |
1561 | gnu@cygnus.com, 15Sep92. | |
95adb866 | 1562 | |
a5afb99f | 1563 | Assuming that some machines need DEPRECATED_INIT_FRAME_PC after |
e9582e71 | 1564 | DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme: |
95adb866 AC |
1565 | |
1566 | SETUP_INNERMOST_FRAME(): Default version is just create_new_frame | |
0ba6dca9 AC |
1567 | (deprecated_read_fp ()), read_pc ()). Machines with extra frame |
1568 | info would do that (or the local equivalent) and then set the | |
1569 | extra fields. | |
95adb866 AC |
1570 | |
1571 | SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that | |
1572 | create_new_frame would no longer init extra frame info; | |
1573 | SETUP_ARBITRARY_FRAME would have to do that. | |
1574 | ||
e9582e71 AC |
1575 | INIT_PREV_FRAME(fromleaf, prev) Replace |
1576 | DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC. | |
1577 | This should also return a flag saying whether to keep the new | |
1578 | frame, or whether to discard it, because on some machines (e.g. | |
618ce49f AC |
1579 | mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID |
1580 | called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good | |
1581 | way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID | |
1582 | into the extra fields of the new frame). std_frame_pc(fromleaf, | |
1583 | prev) | |
95adb866 AC |
1584 | |
1585 | This is the default setting for INIT_PREV_FRAME. It just does | |
a5afb99f AC |
1586 | what the default DEPRECATED_INIT_FRAME_PC does. Some machines |
1587 | will call it from INIT_PREV_FRAME (either at the beginning, the | |
1588 | end, or in the middle). Some machines won't use it. | |
95adb866 AC |
1589 | |
1590 | kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */ | |
1591 | ||
1592 | /* NOTE: cagney/2002-11-09: Just ignore the above! There is no | |
1593 | reason for things to be this complicated. | |
1594 | ||
1595 | The trick is to assume that there is always a frame. Instead of | |
1596 | special casing the inner-most frame, create fake frame | |
1597 | (containing the hardware registers) that is inner to the | |
1598 | user-visible inner-most frame (...) and then unwind from that. | |
1599 | That way architecture code can use use the standard | |
1600 | frame_XX_unwind() functions and not differentiate between the | |
1601 | inner most and any other case. | |
1602 | ||
1603 | Since there is always a frame to unwind from, there is always | |
03febf99 | 1604 | somewhere (THIS_FRAME) to store all the info needed to construct |
95adb866 AC |
1605 | a new (previous) frame without having to first create it. This |
1606 | means that the convolution below - needing to carefully order a | |
1607 | frame's initialization - isn't needed. | |
1608 | ||
618ce49f AC |
1609 | The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least |
1610 | for a more up-to-date architecture, always calls | |
1611 | FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but | |
1612 | without first needing the frame! Instead of the convolution | |
1613 | below, we could have simply called FRAME_SAVED_PC() and been done | |
1614 | with it! Note that FRAME_SAVED_PC() is being superseed by | |
1615 | frame_pc_unwind() and that function does have somewhere to cache | |
1616 | that PC value. */ | |
4c1e7e9d | 1617 | |
2ca6c561 | 1618 | if (DEPRECATED_INIT_FRAME_PC_FIRST_P ()) |
11889732 AC |
1619 | deprecated_update_frame_pc_hack (prev, |
1620 | DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf, | |
1621 | prev)); | |
4c1e7e9d | 1622 | |
e9582e71 AC |
1623 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1624 | DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev); | |
4c1e7e9d AC |
1625 | |
1626 | /* This entry is in the frame queue now, which is good since | |
95adb866 AC |
1627 | FRAME_SAVED_PC may use that queue to figure out its value (see |
1628 | tm-sparc.h). We want the pc saved in the inferior frame. */ | |
a5afb99f | 1629 | if (DEPRECATED_INIT_FRAME_PC_P ()) |
11889732 AC |
1630 | deprecated_update_frame_pc_hack (prev, |
1631 | DEPRECATED_INIT_FRAME_PC (fromleaf, | |
1632 | prev)); | |
4c1e7e9d | 1633 | |
95adb866 AC |
1634 | /* If ->frame and ->pc are unchanged, we are in the process of |
1635 | getting ourselves into an infinite backtrace. Some architectures | |
618ce49f AC |
1636 | check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems |
1637 | like there is no reason this can't be an architecture-independent | |
1638 | check. */ | |
11889732 AC |
1639 | if (get_frame_base (prev) == get_frame_base (this_frame) |
1640 | && get_frame_pc (prev) == get_frame_pc (this_frame)) | |
4c1e7e9d | 1641 | { |
03febf99 | 1642 | this_frame->prev = NULL; |
95adb866 | 1643 | obstack_free (&frame_cache_obstack, prev); |
7f78e237 AC |
1644 | if (frame_debug) |
1645 | { | |
1646 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1647 | fprint_frame (gdb_stdlog, NULL); | |
1648 | fprintf_unfiltered (gdb_stdlog, | |
1649 | " // legacy this.id == prev.id }\n"); | |
1650 | } | |
95adb866 | 1651 | return NULL; |
4c1e7e9d AC |
1652 | } |
1653 | ||
1654 | /* Initialize the code used to unwind the frame PREV based on the PC | |
1655 | (and probably other architectural information). The PC lets you | |
1656 | check things like the debug info at that point (dwarf2cfi?) and | |
870b3035 AC |
1657 | use that to decide how the frame should be unwound. |
1658 | ||
1659 | If there isn't a FRAME_CHAIN, the code above will have already | |
1660 | done this. */ | |
1661 | if (prev->unwind == NULL) | |
e8a89fe2 | 1662 | prev->unwind = frame_unwind_find_by_frame (prev->next); |
4c1e7e9d | 1663 | |
7df05f2b AC |
1664 | /* If the unwinder provides a frame type, use it. Otherwize |
1665 | continue on to that heuristic mess. */ | |
1666 | if (prev->unwind->type != UNKNOWN_FRAME) | |
1667 | { | |
1668 | prev->type = prev->unwind->type; | |
18adea3f | 1669 | if (prev->type == NORMAL_FRAME) |
870b3035 | 1670 | /* FIXME: cagney/2003-06-16: would get_frame_pc() be better? */ |
18adea3f AC |
1671 | prev->this_id.value.code_addr |
1672 | = get_pc_function_start (prev->this_id.value.code_addr); | |
7f78e237 AC |
1673 | if (frame_debug) |
1674 | { | |
1675 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1676 | fprint_frame (gdb_stdlog, prev); | |
1677 | fprintf_unfiltered (gdb_stdlog, " } // legacy with unwound type\n"); | |
1678 | } | |
7df05f2b AC |
1679 | return prev; |
1680 | } | |
1681 | ||
5a203e44 AC |
1682 | /* NOTE: cagney/2002-11-18: The code segments, found in |
1683 | create_new_frame and get_prev_frame(), that initializes the | |
1684 | frames type is subtly different. The latter only updates ->type | |
1685 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops | |
1686 | get_prev_frame() overriding the frame's type when the INIT code | |
1687 | has previously set it. This is really somewhat bogus. The | |
1688 | initialization, as seen in create_new_frame(), should occur | |
1689 | before the INIT function has been called. */ | |
07555a72 | 1690 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
ae45cd16 | 1691 | && (DEPRECATED_PC_IN_CALL_DUMMY_P () |
11889732 AC |
1692 | ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev), 0, 0) |
1693 | : pc_in_dummy_frame (get_frame_pc (prev)))) | |
5a203e44 AC |
1694 | prev->type = DUMMY_FRAME; |
1695 | else | |
1696 | { | |
1697 | /* FIXME: cagney/2002-11-10: This should be moved to before the | |
1698 | INIT code above so that the INIT code knows what the frame's | |
1699 | type is (in fact, for a [generic] dummy-frame, the type can | |
1700 | be set and then the entire initialization can be skipped. | |
1701 | Unforunatly, its the INIT code that sets the PC (Hmm, catch | |
1702 | 22). */ | |
1703 | char *name; | |
11889732 AC |
1704 | find_pc_partial_function (get_frame_pc (prev), &name, NULL, NULL); |
1705 | if (PC_IN_SIGTRAMP (get_frame_pc (prev), name)) | |
5a203e44 AC |
1706 | prev->type = SIGTRAMP_FRAME; |
1707 | /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some | |
1708 | architectures are forcing the frame's type in INIT so we | |
1709 | don't want to override it here. Remember, NORMAL_FRAME == 0, | |
1710 | so it all works (just :-/). Once this initialization is | |
1711 | moved to the start of this function, all this nastness will | |
1712 | go away. */ | |
1713 | } | |
4c1e7e9d | 1714 | |
18adea3f AC |
1715 | if (prev->type == NORMAL_FRAME) |
1716 | prev->this_id.value.code_addr | |
1717 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1718 | ||
7f78e237 AC |
1719 | if (frame_debug) |
1720 | { | |
1721 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1722 | fprint_frame (gdb_stdlog, prev); | |
1723 | fprintf_unfiltered (gdb_stdlog, " } // legacy with confused type\n"); | |
1724 | } | |
1725 | ||
4c1e7e9d AC |
1726 | return prev; |
1727 | } | |
1728 | ||
eb4f72c5 | 1729 | /* Return a structure containing various interesting information |
03febf99 | 1730 | about the frame that called THIS_FRAME. Returns NULL |
5bf00f29 MK |
1731 | if there is no such frame. |
1732 | ||
1733 | This function tests some target-independent conditions that should | |
1734 | terminate the frame chain, such as unwinding past main(). It | |
1735 | should not contain any target-dependent tests, such as checking | |
1736 | whether the program-counter is zero. */ | |
eb4f72c5 AC |
1737 | |
1738 | struct frame_info * | |
03febf99 | 1739 | get_prev_frame (struct frame_info *this_frame) |
eb4f72c5 AC |
1740 | { |
1741 | struct frame_info *prev_frame; | |
1742 | ||
7f78e237 AC |
1743 | if (frame_debug) |
1744 | { | |
1745 | fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame="); | |
1746 | if (this_frame != NULL) | |
1747 | fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level); | |
1748 | else | |
1749 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
1750 | fprintf_unfiltered (gdb_stdlog, ") "); | |
1751 | } | |
1752 | ||
eb4f72c5 AC |
1753 | /* Return the inner-most frame, when the caller passes in NULL. */ |
1754 | /* NOTE: cagney/2002-11-09: Not sure how this would happen. The | |
1755 | caller should have previously obtained a valid frame using | |
1756 | get_selected_frame() and then called this code - only possibility | |
1757 | I can think of is code behaving badly. | |
1758 | ||
1759 | NOTE: cagney/2003-01-10: Talk about code behaving badly. Check | |
1760 | block_innermost_frame(). It does the sequence: frame = NULL; | |
1761 | while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why | |
1762 | it couldn't be written better, I don't know. | |
1763 | ||
1764 | NOTE: cagney/2003-01-11: I suspect what is happening is | |
1765 | block_innermost_frame() is, when the target has no state | |
1766 | (registers, memory, ...), still calling this function. The | |
1767 | assumption being that this function will return NULL indicating | |
1768 | that a frame isn't possible, rather than checking that the target | |
1769 | has state and then calling get_current_frame() and | |
1770 | get_prev_frame(). This is a guess mind. */ | |
03febf99 | 1771 | if (this_frame == NULL) |
eb4f72c5 AC |
1772 | { |
1773 | /* NOTE: cagney/2002-11-09: There was a code segment here that | |
1774 | would error out when CURRENT_FRAME was NULL. The comment | |
1775 | that went with it made the claim ... | |
1776 | ||
1777 | ``This screws value_of_variable, which just wants a nice | |
1778 | clean NULL return from block_innermost_frame if there are no | |
1779 | frames. I don't think I've ever seen this message happen | |
1780 | otherwise. And returning NULL here is a perfectly legitimate | |
1781 | thing to do.'' | |
1782 | ||
1783 | Per the above, this code shouldn't even be called with a NULL | |
03febf99 | 1784 | THIS_FRAME. */ |
eb4f72c5 AC |
1785 | return current_frame; |
1786 | } | |
1787 | ||
1788 | /* There is always a frame. If this assertion fails, suspect that | |
1789 | something should be calling get_selected_frame() or | |
1790 | get_current_frame(). */ | |
03febf99 | 1791 | gdb_assert (this_frame != NULL); |
eb4f72c5 | 1792 | |
3f1d7f16 MK |
1793 | /* Make sure we pass an address within THIS_FRAME's code block to |
1794 | inside_main_func. Otherwise, we might stop unwinding at a | |
1795 | function which has a call instruction as its last instruction if | |
1796 | that function immediately precedes main(). */ | |
03febf99 | 1797 | if (this_frame->level >= 0 |
25d29d70 | 1798 | && !backtrace_past_main |
3f1d7f16 | 1799 | && inside_main_func (get_frame_address_in_block (this_frame))) |
eb4f72c5 AC |
1800 | /* Don't unwind past main(), bug always unwind the sentinel frame. |
1801 | Note, this is done _before_ the frame has been marked as | |
1802 | previously unwound. That way if the user later decides to | |
1803 | allow unwinds past main(), that just happens. */ | |
ac2bd0a9 AC |
1804 | { |
1805 | if (frame_debug) | |
7f78e237 | 1806 | fprintf_unfiltered (gdb_stdlog, "-> NULL // inside main func }\n"); |
ac2bd0a9 AC |
1807 | return NULL; |
1808 | } | |
eb4f72c5 | 1809 | |
25d29d70 AC |
1810 | if (this_frame->level > backtrace_limit) |
1811 | { | |
1812 | error ("Backtrace limit of %d exceeded", backtrace_limit); | |
1813 | } | |
1814 | ||
0714963c AC |
1815 | /* If we're already inside the entry function for the main objfile, |
1816 | then it isn't valid. Don't apply this test to a dummy frame - | |
1817 | dummy frame PC's typically land in the entry func. Don't apply | |
1818 | this test to the sentinel frame. Sentinel frames should always | |
1819 | be allowed to unwind. */ | |
1820 | /* NOTE: cagney/2003-02-25: Don't enable until someone has found | |
1821 | hard evidence that this is needed. */ | |
1822 | /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func - wasn't | |
1823 | checking for "main" in the minimal symbols. With that fixed | |
1824 | asm-source tests now stop in "main" instead of halting the | |
1825 | backtrace in wierd and wonderful ways somewhere inside the entry | |
627b3ba2 AC |
1826 | file. Suspect that deprecated_inside_entry_file and |
1827 | inside_entry_func tests were added to work around that (now | |
1828 | fixed) case. */ | |
0714963c AC |
1829 | /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right) |
1830 | suggested having the inside_entry_func test use the | |
1831 | inside_main_func msymbol trick (along with entry_point_address I | |
1832 | guess) to determine the address range of the start function. | |
1833 | That should provide a far better stopper than the current | |
1834 | heuristics. */ | |
1835 | /* NOTE: cagney/2003-07-15: Need to add a "set backtrace | |
1836 | beyond-entry-func" command so that this can be selectively | |
1837 | disabled. */ | |
1838 | if (0 | |
1839 | #if 0 | |
1840 | && backtrace_beyond_entry_func | |
1841 | #endif | |
1842 | && this_frame->type != DUMMY_FRAME && this_frame->level >= 0 | |
6e4c6c91 | 1843 | && inside_entry_func (this_frame)) |
0714963c AC |
1844 | { |
1845 | if (frame_debug) | |
1846 | { | |
1847 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1848 | fprint_frame (gdb_stdlog, NULL); | |
1849 | fprintf_unfiltered (gdb_stdlog, "// inside entry func }\n"); | |
1850 | } | |
1851 | return NULL; | |
1852 | } | |
1853 | ||
eb4f72c5 | 1854 | /* Only try to do the unwind once. */ |
03febf99 | 1855 | if (this_frame->prev_p) |
7f78e237 AC |
1856 | { |
1857 | if (frame_debug) | |
1858 | { | |
1859 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1860 | fprint_frame (gdb_stdlog, this_frame->prev); | |
1861 | fprintf_unfiltered (gdb_stdlog, " // cached \n"); | |
1862 | } | |
1863 | return this_frame->prev; | |
1864 | } | |
03febf99 | 1865 | this_frame->prev_p = 1; |
eb4f72c5 | 1866 | |
b14185ce AC |
1867 | /* If we're inside the entry file, it isn't valid. Don't apply this |
1868 | test to a dummy frame - dummy frame PC's typically land in the | |
1869 | entry file. Don't apply this test to the sentinel frame. | |
1870 | Sentinel frames should always be allowed to unwind. */ | |
eb4f72c5 AC |
1871 | /* NOTE: drow/2002-12-25: should there be a way to disable this |
1872 | check? It assumes a single small entry file, and the way some | |
1873 | debug readers (e.g. dbxread) figure out which object is the | |
1874 | entry file is somewhat hokey. */ | |
1875 | /* NOTE: cagney/2003-01-10: If there is a way of disabling this test | |
1876 | then it should probably be moved to before the ->prev_p test, | |
1877 | above. */ | |
627b3ba2 AC |
1878 | /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call |
1879 | to deprecated_inside_entry_file destroys a meaningful backtrace | |
1880 | under some conditions. E. g. the backtrace tests in the | |
1881 | asm-source testcase are broken for some targets. In this test | |
1882 | the functions are all implemented as part of one file and the | |
1883 | testcase is not necessarily linked with a start file (depending | |
1884 | on the target). What happens is, that the first frame is printed | |
1885 | normaly and following frames are treated as being inside the | |
1886 | enttry file then. This way, only the #0 frame is printed in the | |
1887 | backtrace output. */ | |
1888 | if (0 | |
1889 | && this_frame->type != DUMMY_FRAME && this_frame->level >= 0 | |
1890 | && deprecated_inside_entry_file (get_frame_pc (this_frame))) | |
ac2bd0a9 AC |
1891 | { |
1892 | if (frame_debug) | |
7f78e237 AC |
1893 | { |
1894 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1895 | fprint_frame (gdb_stdlog, NULL); | |
1896 | fprintf_unfiltered (gdb_stdlog, " // inside entry file }\n"); | |
1897 | } | |
eb4f72c5 | 1898 | return NULL; |
ac2bd0a9 | 1899 | } |
eb4f72c5 AC |
1900 | |
1901 | /* If any of the old frame initialization methods are around, use | |
055bb976 AC |
1902 | the legacy get_prev_frame method. */ |
1903 | if (legacy_frame_p (current_gdbarch)) | |
ac2bd0a9 | 1904 | { |
03febf99 | 1905 | prev_frame = legacy_get_prev_frame (this_frame); |
ac2bd0a9 AC |
1906 | return prev_frame; |
1907 | } | |
eb4f72c5 | 1908 | |
270c3b1d AC |
1909 | /* Check that this frame's ID was valid. If it wasn't, don't try to |
1910 | unwind to the prev frame. Be careful to not apply this test to | |
1911 | the sentinel frame. */ | |
1912 | if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame))) | |
1913 | { | |
1914 | if (frame_debug) | |
7f78e237 AC |
1915 | { |
1916 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1917 | fprint_frame (gdb_stdlog, NULL); | |
1918 | fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n"); | |
1919 | } | |
270c3b1d AC |
1920 | return NULL; |
1921 | } | |
1922 | ||
1923 | /* Check that this frame's ID isn't inner to (younger, below, next) | |
612dde91 AC |
1924 | the next frame. This happens when a frame unwind goes backwards. |
1925 | Since the sentinel frame doesn't really exist, don't compare the | |
1926 | inner-most against that sentinel. */ | |
270c3b1d AC |
1927 | if (this_frame->level > 0 |
1928 | && frame_id_inner (get_frame_id (this_frame), | |
1929 | get_frame_id (this_frame->next))) | |
612dde91 AC |
1930 | error ("Previous frame inner to this frame (corrupt stack?)"); |
1931 | ||
1932 | /* Check that this and the next frame are not identical. If they | |
1933 | are, there is most likely a stack cycle. As with the inner-than | |
1934 | test above, avoid comparing the inner-most and sentinel frames. */ | |
1935 | if (this_frame->level > 0 | |
270c3b1d AC |
1936 | && frame_id_eq (get_frame_id (this_frame), |
1937 | get_frame_id (this_frame->next))) | |
612dde91 | 1938 | error ("Previous frame identical to this frame (corrupt stack?)"); |
270c3b1d | 1939 | |
eb4f72c5 AC |
1940 | /* Allocate the new frame but do not wire it in to the frame chain. |
1941 | Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along | |
1942 | frame->next to pull some fancy tricks (of course such code is, by | |
1943 | definition, recursive). Try to prevent it. | |
1944 | ||
1945 | There is no reason to worry about memory leaks, should the | |
1946 | remainder of the function fail. The allocated memory will be | |
1947 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1948 | been here before' check above will stop repeated memory | |
1949 | allocation calls. */ | |
1950 | prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
03febf99 | 1951 | prev_frame->level = this_frame->level + 1; |
eb4f72c5 | 1952 | |
c50901fd AC |
1953 | /* Don't yet compute ->unwind (and hence ->type). It is computed |
1954 | on-demand in get_frame_type, frame_register_unwind, and | |
1955 | get_frame_id. */ | |
eb4f72c5 | 1956 | |
c50901fd AC |
1957 | /* Don't yet compute the frame's ID. It is computed on-demand by |
1958 | get_frame_id(). */ | |
6dc42492 | 1959 | |
270c3b1d AC |
1960 | /* The unwound frame ID is validate at the start of this function, |
1961 | as part of the logic to decide if that frame should be further | |
1962 | unwound, and not here while the prev frame is being created. | |
1963 | Doing this makes it possible for the user to examine a frame that | |
1964 | has an invalid frame ID. | |
1965 | ||
25e3a86b AC |
1966 | Some very old VAX code noted: [...] For the sake of argument, |
1967 | suppose that the stack is somewhat trashed (which is one reason | |
1968 | that "info frame" exists). So, return 0 (indicating we don't | |
1969 | know the address of the arglist) if we don't know what frame this | |
1970 | frame calls. */ | |
6dc42492 | 1971 | |
eb4f72c5 | 1972 | /* Link it in. */ |
03febf99 AC |
1973 | this_frame->prev = prev_frame; |
1974 | prev_frame->next = this_frame; | |
eb4f72c5 | 1975 | |
7f78e237 AC |
1976 | if (frame_debug) |
1977 | { | |
1978 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1979 | fprint_frame (gdb_stdlog, prev_frame); | |
1980 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1981 | } | |
1982 | ||
eb4f72c5 AC |
1983 | return prev_frame; |
1984 | } | |
1985 | ||
4c1e7e9d AC |
1986 | CORE_ADDR |
1987 | get_frame_pc (struct frame_info *frame) | |
1988 | { | |
d1340264 AC |
1989 | gdb_assert (frame->next != NULL); |
1990 | return frame_pc_unwind (frame->next); | |
4c1e7e9d AC |
1991 | } |
1992 | ||
8edd5d01 AC |
1993 | /* Return an address of that falls within the frame's code block. */ |
1994 | ||
1995 | CORE_ADDR | |
1996 | frame_unwind_address_in_block (struct frame_info *next_frame) | |
1997 | { | |
1998 | /* A draft address. */ | |
1999 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
2000 | ||
2001 | /* If THIS frame is not inner most (i.e., NEXT isn't the sentinel), | |
2002 | and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS | |
2003 | frame's PC ends up pointing at the instruction fallowing the | |
2004 | "call". Adjust that PC value so that it falls on the call | |
2005 | instruction (which, hopefully, falls within THIS frame's code | |
2006 | block. So far it's proved to be a very good approximation. See | |
2007 | get_frame_type for why ->type can't be used. */ | |
2008 | if (next_frame->level >= 0 | |
2009 | && get_frame_type (next_frame) == NORMAL_FRAME) | |
2010 | --pc; | |
2011 | return pc; | |
2012 | } | |
2013 | ||
2014 | CORE_ADDR | |
2015 | get_frame_address_in_block (struct frame_info *this_frame) | |
2016 | { | |
2017 | return frame_unwind_address_in_block (this_frame->next); | |
2018 | } | |
2019 | ||
1058bca7 AC |
2020 | static int |
2021 | pc_notcurrent (struct frame_info *frame) | |
2022 | { | |
2023 | /* If FRAME is not the innermost frame, that normally means that | |
2024 | FRAME->pc points at the return instruction (which is *after* the | |
2025 | call instruction), and we want to get the line containing the | |
2026 | call (because the call is where the user thinks the program is). | |
2027 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
2028 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
2029 | PC and such a PC indicates the current (rather than next) | |
2030 | instruction/line, consequently, for such cases, want to get the | |
2031 | line containing fi->pc. */ | |
2032 | struct frame_info *next = get_next_frame (frame); | |
2033 | int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME); | |
2034 | return notcurrent; | |
2035 | } | |
2036 | ||
2037 | void | |
2038 | find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal) | |
2039 | { | |
11889732 | 2040 | (*sal) = find_pc_line (get_frame_pc (frame), pc_notcurrent (frame)); |
1058bca7 AC |
2041 | } |
2042 | ||
c193f6ac AC |
2043 | /* Per "frame.h", return the ``address'' of the frame. Code should |
2044 | really be using get_frame_id(). */ | |
2045 | CORE_ADDR | |
2046 | get_frame_base (struct frame_info *fi) | |
2047 | { | |
d0a55772 | 2048 | return get_frame_id (fi).stack_addr; |
c193f6ac AC |
2049 | } |
2050 | ||
da62e633 AC |
2051 | /* High-level offsets into the frame. Used by the debug info. */ |
2052 | ||
2053 | CORE_ADDR | |
2054 | get_frame_base_address (struct frame_info *fi) | |
2055 | { | |
7df05f2b | 2056 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2057 | return 0; |
2058 | if (fi->base == NULL) | |
e8a89fe2 | 2059 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2060 | /* Sneaky: If the low-level unwind and high-level base code share a |
2061 | common unwinder, let them share the prologue cache. */ | |
2062 | if (fi->base->unwind == fi->unwind) | |
2063 | return fi->base->this_base (fi->next, &fi->prologue_cache); | |
2064 | return fi->base->this_base (fi->next, &fi->base_cache); | |
2065 | } | |
2066 | ||
2067 | CORE_ADDR | |
2068 | get_frame_locals_address (struct frame_info *fi) | |
2069 | { | |
2070 | void **cache; | |
7df05f2b | 2071 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2072 | return 0; |
2073 | /* If there isn't a frame address method, find it. */ | |
2074 | if (fi->base == NULL) | |
e8a89fe2 | 2075 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2076 | /* Sneaky: If the low-level unwind and high-level base code share a |
2077 | common unwinder, let them share the prologue cache. */ | |
2078 | if (fi->base->unwind == fi->unwind) | |
2079 | cache = &fi->prologue_cache; | |
2080 | else | |
2081 | cache = &fi->base_cache; | |
2082 | return fi->base->this_locals (fi->next, cache); | |
2083 | } | |
2084 | ||
2085 | CORE_ADDR | |
2086 | get_frame_args_address (struct frame_info *fi) | |
2087 | { | |
2088 | void **cache; | |
7df05f2b | 2089 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2090 | return 0; |
2091 | /* If there isn't a frame address method, find it. */ | |
2092 | if (fi->base == NULL) | |
e8a89fe2 | 2093 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2094 | /* Sneaky: If the low-level unwind and high-level base code share a |
2095 | common unwinder, let them share the prologue cache. */ | |
2096 | if (fi->base->unwind == fi->unwind) | |
2097 | cache = &fi->prologue_cache; | |
2098 | else | |
2099 | cache = &fi->base_cache; | |
2100 | return fi->base->this_args (fi->next, cache); | |
2101 | } | |
2102 | ||
85cf597a AC |
2103 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
2104 | or -1 for a NULL frame. */ | |
2105 | ||
2106 | int | |
2107 | frame_relative_level (struct frame_info *fi) | |
2108 | { | |
2109 | if (fi == NULL) | |
2110 | return -1; | |
2111 | else | |
2112 | return fi->level; | |
2113 | } | |
2114 | ||
5a203e44 AC |
2115 | enum frame_type |
2116 | get_frame_type (struct frame_info *frame) | |
2117 | { | |
2118 | /* Some targets still don't use [generic] dummy frames. Catch them | |
2119 | here. */ | |
07555a72 | 2120 | if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
5a203e44 AC |
2121 | && deprecated_frame_in_dummy (frame)) |
2122 | return DUMMY_FRAME; | |
710ee10a KB |
2123 | |
2124 | /* Some legacy code, e.g, mips_init_extra_frame_info() wants | |
2125 | to determine the frame's type prior to it being completely | |
2126 | initialized. Don't attempt to lazily initialize ->unwind for | |
2127 | legacy code. It will be initialized in legacy_get_prev_frame(). */ | |
2128 | if (frame->unwind == NULL && !legacy_frame_p (current_gdbarch)) | |
c50901fd AC |
2129 | { |
2130 | /* Initialize the frame's unwinder because it is that which | |
2131 | provides the frame's type. */ | |
e8a89fe2 | 2132 | frame->unwind = frame_unwind_find_by_frame (frame->next); |
c50901fd AC |
2133 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
2134 | type in the frame, the unwinder's type should be returned | |
ce2826aa | 2135 | directly. Unfortunately, legacy code, called by |
c50901fd AC |
2136 | legacy_get_prev_frame, explicitly set the frames type using |
2137 | the method deprecated_set_frame_type(). */ | |
c50901fd AC |
2138 | frame->type = frame->unwind->type; |
2139 | } | |
7df05f2b AC |
2140 | if (frame->type == UNKNOWN_FRAME) |
2141 | return NORMAL_FRAME; | |
2142 | else | |
2143 | return frame->type; | |
5a203e44 AC |
2144 | } |
2145 | ||
2146 | void | |
2147 | deprecated_set_frame_type (struct frame_info *frame, enum frame_type type) | |
2148 | { | |
2149 | /* Arrrg! See comment in "frame.h". */ | |
2150 | frame->type = type; | |
2151 | } | |
2152 | ||
0394eb2a AC |
2153 | struct frame_extra_info * |
2154 | get_frame_extra_info (struct frame_info *fi) | |
2155 | { | |
2156 | return fi->extra_info; | |
2157 | } | |
2158 | ||
2c517d0e AC |
2159 | struct frame_extra_info * |
2160 | frame_extra_info_zalloc (struct frame_info *fi, long size) | |
2161 | { | |
479ab5a0 | 2162 | fi->extra_info = frame_obstack_zalloc (size); |
2c517d0e AC |
2163 | return fi->extra_info; |
2164 | } | |
2165 | ||
b87efeee | 2166 | void |
2f107107 | 2167 | deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc) |
b87efeee | 2168 | { |
7f78e237 AC |
2169 | if (frame_debug) |
2170 | fprintf_unfiltered (gdb_stdlog, | |
2171 | "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n", | |
2172 | frame->level, paddr_nz (pc)); | |
e0d2ae16 AC |
2173 | /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are |
2174 | maintaining a locally allocated frame object. Since such frame's | |
2175 | are not in the frame chain, it isn't possible to assume that the | |
2176 | frame has a next. Sigh. */ | |
2177 | if (frame->next != NULL) | |
2178 | { | |
2179 | /* While we're at it, update this frame's cached PC value, found | |
2180 | in the next frame. Oh for the day when "struct frame_info" | |
2181 | is opaque and this hack on hack can just go away. */ | |
d1340264 AC |
2182 | frame->next->prev_pc.value = pc; |
2183 | frame->next->prev_pc.p = 1; | |
e0d2ae16 | 2184 | } |
2f107107 AC |
2185 | } |
2186 | ||
2187 | void | |
2188 | deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base) | |
2189 | { | |
7f78e237 AC |
2190 | if (frame_debug) |
2191 | fprintf_unfiltered (gdb_stdlog, | |
2192 | "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n", | |
2193 | frame->level, paddr_nz (base)); | |
2f107107 | 2194 | /* See comment in "frame.h". */ |
d0a55772 | 2195 | frame->this_id.value.stack_addr = base; |
b87efeee AC |
2196 | } |
2197 | ||
c8b8a898 | 2198 | struct frame_info * |
213cc0ad AC |
2199 | deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs, |
2200 | long sizeof_extra_info) | |
c8b8a898 | 2201 | { |
bcf7d3ca AC |
2202 | struct frame_info *frame = XMALLOC (struct frame_info); |
2203 | memset (frame, 0, sizeof (*frame)); | |
18adea3f | 2204 | frame->this_id.p = 1; |
f6c609c4 AC |
2205 | make_cleanup (xfree, frame); |
2206 | if (sizeof_saved_regs > 0) | |
2207 | { | |
2208 | frame->saved_regs = xcalloc (1, sizeof_saved_regs); | |
2209 | make_cleanup (xfree, frame->saved_regs); | |
2210 | } | |
2211 | if (sizeof_extra_info > 0) | |
2212 | { | |
2213 | frame->extra_info = xcalloc (1, sizeof_extra_info); | |
2214 | make_cleanup (xfree, frame->extra_info); | |
2215 | } | |
2216 | return frame; | |
2217 | } | |
c8b8a898 | 2218 | |
ae1e7417 AC |
2219 | /* Memory access methods. */ |
2220 | ||
2221 | void | |
2222 | get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, void *buf, | |
2223 | int len) | |
2224 | { | |
2225 | read_memory (addr, buf, len); | |
2226 | } | |
2227 | ||
2228 | LONGEST | |
2229 | get_frame_memory_signed (struct frame_info *this_frame, CORE_ADDR addr, | |
2230 | int len) | |
2231 | { | |
2232 | return read_memory_integer (addr, len); | |
2233 | } | |
2234 | ||
2235 | ULONGEST | |
2236 | get_frame_memory_unsigned (struct frame_info *this_frame, CORE_ADDR addr, | |
2237 | int len) | |
2238 | { | |
2239 | return read_memory_unsigned_integer (addr, len); | |
2240 | } | |
2241 | ||
2242 | /* Architecture method. */ | |
2243 | ||
2244 | struct gdbarch * | |
2245 | get_frame_arch (struct frame_info *this_frame) | |
2246 | { | |
2247 | return current_gdbarch; | |
2248 | } | |
2249 | ||
a9e5fdc2 AC |
2250 | /* Stack pointer methods. */ |
2251 | ||
2252 | CORE_ADDR | |
2253 | get_frame_sp (struct frame_info *this_frame) | |
2254 | { | |
2255 | return frame_sp_unwind (this_frame->next); | |
2256 | } | |
2257 | ||
2258 | CORE_ADDR | |
2259 | frame_sp_unwind (struct frame_info *next_frame) | |
2260 | { | |
2261 | /* Normality, an architecture that provides a way of obtaining any | |
2262 | frame inner-most address. */ | |
2263 | if (gdbarch_unwind_sp_p (current_gdbarch)) | |
2264 | return gdbarch_unwind_sp (current_gdbarch, next_frame); | |
2265 | /* Things are looking grim. If it's the inner-most frame and there | |
2266 | is a TARGET_READ_SP then that can be used. */ | |
2267 | if (next_frame->level < 0 && TARGET_READ_SP_P ()) | |
2268 | return TARGET_READ_SP (); | |
2269 | /* Now things are really are grim. Hope that the value returned by | |
2270 | the SP_REGNUM register is meaningful. */ | |
2271 | if (SP_REGNUM >= 0) | |
2272 | { | |
2273 | ULONGEST sp; | |
2274 | frame_unwind_unsigned_register (next_frame, SP_REGNUM, &sp); | |
2275 | return sp; | |
2276 | } | |
2277 | internal_error (__FILE__, __LINE__, "Missing unwind SP method"); | |
2278 | } | |
2279 | ||
2280 | ||
1594fa56 AC |
2281 | int |
2282 | legacy_frame_p (struct gdbarch *current_gdbarch) | |
2283 | { | |
31b75dbf AC |
2284 | if (DEPRECATED_INIT_FRAME_PC_P () |
2285 | || DEPRECATED_INIT_FRAME_PC_FIRST_P () | |
2286 | || DEPRECATED_INIT_EXTRA_FRAME_INFO_P () | |
2287 | || DEPRECATED_FRAME_CHAIN_P ()) | |
2288 | /* No question, it's a legacy frame. */ | |
2289 | return 1; | |
2290 | if (gdbarch_unwind_dummy_id_p (current_gdbarch)) | |
2291 | /* No question, it's not a legacy frame (provided none of the | |
2292 | deprecated methods checked above are present that is). */ | |
2293 | return 0; | |
2294 | if (DEPRECATED_TARGET_READ_FP_P () | |
2295 | || DEPRECATED_FP_REGNUM >= 0) | |
2296 | /* Assume it's legacy. If you're trying to convert a legacy frame | |
2297 | target to the new mechanism, get rid of these. legacy | |
2298 | get_prev_frame requires these when unwind_frame_id isn't | |
2299 | available. */ | |
2300 | return 1; | |
2301 | /* Default to assuming that it's brand new code, and hence not | |
2302 | legacy. Force it down the non-legacy path so that the new code | |
2303 | uses the new frame mechanism from day one. Dummy frame's won't | |
2304 | work very well but we can live with that. */ | |
2305 | return 0; | |
1594fa56 AC |
2306 | } |
2307 | ||
b9362cc7 AC |
2308 | extern initialize_file_ftype _initialize_frame; /* -Wmissing-prototypes */ |
2309 | ||
25d29d70 AC |
2310 | static struct cmd_list_element *set_backtrace_cmdlist; |
2311 | static struct cmd_list_element *show_backtrace_cmdlist; | |
2312 | ||
2313 | static void | |
2314 | set_backtrace_cmd (char *args, int from_tty) | |
2315 | { | |
2316 | help_list (set_backtrace_cmdlist, "set backtrace ", -1, gdb_stdout); | |
2317 | } | |
2318 | ||
2319 | static void | |
2320 | show_backtrace_cmd (char *args, int from_tty) | |
2321 | { | |
2322 | cmd_show_list (show_backtrace_cmdlist, from_tty, ""); | |
2323 | } | |
2324 | ||
4c1e7e9d AC |
2325 | void |
2326 | _initialize_frame (void) | |
2327 | { | |
2328 | obstack_init (&frame_cache_obstack); | |
eb4f72c5 | 2329 | |
25d29d70 AC |
2330 | add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, "\ |
2331 | Set backtrace specific variables.\n\ | |
2332 | Configure backtrace variables such as the backtrace limit", | |
2333 | &set_backtrace_cmdlist, "set backtrace ", | |
2334 | 0/*allow-unknown*/, &setlist); | |
2335 | add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, "\ | |
2336 | Show backtrace specific variables\n\ | |
2337 | Show backtrace variables such as the backtrace limit", | |
2338 | &show_backtrace_cmdlist, "show backtrace ", | |
2339 | 0/*allow-unknown*/, &showlist); | |
2340 | ||
2341 | add_setshow_boolean_cmd ("past-main", class_obscure, | |
2342 | &backtrace_past_main, "\ | |
eb4f72c5 AC |
2343 | Set whether backtraces should continue past \"main\".\n\ |
2344 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2345 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2346 | of the stack trace.", "\ | |
2347 | Show whether backtraces should continue past \"main\".\n\ | |
2348 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2349 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2350 | of the stack trace.", | |
25d29d70 AC |
2351 | NULL, NULL, &set_backtrace_cmdlist, |
2352 | &show_backtrace_cmdlist); | |
2353 | ||
2354 | add_setshow_uinteger_cmd ("limit", class_obscure, | |
2355 | &backtrace_limit, "\ | |
2356 | Set an upper bound on the number of backtrace levels.\n\ | |
fec74868 | 2357 | No more than the specified number of frames can be displayed or examined.\n\ |
25d29d70 AC |
2358 | Zero is unlimited.", "\ |
2359 | Show the upper bound on the number of backtrace levels.", | |
2360 | NULL, NULL, &set_backtrace_cmdlist, | |
2361 | &show_backtrace_cmdlist); | |
ac2bd0a9 AC |
2362 | |
2363 | /* Debug this files internals. */ | |
2364 | add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger, | |
2365 | &frame_debug, "Set frame debugging.\n\ | |
2366 | When non-zero, frame specific internal debugging is enabled.", &setdebuglist), | |
2367 | &showdebuglist); | |
4c1e7e9d | 2368 | } |