Commit | Line | Data |
---|---|---|
4f460812 | 1 | /* Cache and manage frames for GDB, the GNU debugger. |
96cb11df AC |
2 | |
3 | Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, | |
51603483 | 4 | 2001, 2002, 2003 Free Software Foundation, Inc. |
d65fe839 AC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "target.h" | |
26 | #include "value.h" | |
39f77062 | 27 | #include "inferior.h" /* for inferior_ptid */ |
4e052eda | 28 | #include "regcache.h" |
4f460812 | 29 | #include "gdb_assert.h" |
e36180d7 | 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 | |
68 | ->unwind->type. Unfortunatly, legacy code is still explicitly | |
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 | ||
89 | /* If dwarf2 unwind frame informations is used, this structure holds | |
90 | all related unwind data. */ | |
91 | struct context *context; | |
92 | ||
93 | /* The frame's low-level unwinder and corresponding cache. The | |
94 | low-level unwinder is responsible for unwinding register values | |
95 | for the previous frame. The low-level unwind methods are | |
96 | selected based on the presence, or otherwize, of register unwind | |
97 | information such as CFI. */ | |
98 | void *prologue_cache; | |
99 | const struct frame_unwind *unwind; | |
100 | ||
101 | /* Cached copy of the previous frame's resume address. */ | |
102 | struct { | |
103 | int p; | |
104 | CORE_ADDR value; | |
105 | } prev_pc; | |
106 | ||
107 | /* Cached copy of the previous frame's function address. */ | |
108 | struct | |
109 | { | |
110 | CORE_ADDR addr; | |
111 | int p; | |
112 | } prev_func; | |
113 | ||
114 | /* This frame's ID. */ | |
115 | struct | |
116 | { | |
117 | int p; | |
118 | struct frame_id value; | |
119 | } this_id; | |
120 | ||
121 | /* The frame's high-level base methods, and corresponding cache. | |
122 | The high level base methods are selected based on the frame's | |
123 | debug info. */ | |
124 | const struct frame_base *base; | |
125 | void *base_cache; | |
126 | ||
127 | /* Pointers to the next (down, inner, younger) and previous (up, | |
128 | outer, older) frame_info's in the frame cache. */ | |
129 | struct frame_info *next; /* down, inner, younger */ | |
130 | int prev_p; | |
131 | struct frame_info *prev; /* up, outer, older */ | |
132 | }; | |
133 | ||
ac2bd0a9 AC |
134 | /* Flag to control debugging. */ |
135 | ||
136 | static int frame_debug; | |
137 | ||
25d29d70 AC |
138 | /* Flag to indicate whether backtraces should stop at main et.al. */ |
139 | ||
140 | static int backtrace_past_main; | |
141 | static unsigned int backtrace_limit = UINT_MAX; | |
eb4f72c5 | 142 | |
d65fe839 | 143 | |
00905d52 | 144 | void |
7f78e237 AC |
145 | fprint_frame_id (struct ui_file *file, struct frame_id id) |
146 | { | |
147 | fprintf_unfiltered (file, "{stack=0x%s,code=0x%s}", | |
148 | paddr_nz (id.stack_addr), | |
149 | paddr_nz (id.code_addr)); | |
150 | } | |
151 | ||
152 | static void | |
153 | fprint_frame_type (struct ui_file *file, enum frame_type type) | |
154 | { | |
155 | switch (type) | |
156 | { | |
157 | case UNKNOWN_FRAME: | |
158 | fprintf_unfiltered (file, "UNKNOWN_FRAME"); | |
159 | return; | |
160 | case NORMAL_FRAME: | |
161 | fprintf_unfiltered (file, "NORMAL_FRAME"); | |
162 | return; | |
163 | case DUMMY_FRAME: | |
164 | fprintf_unfiltered (file, "DUMMY_FRAME"); | |
165 | return; | |
166 | case SIGTRAMP_FRAME: | |
167 | fprintf_unfiltered (file, "SIGTRAMP_FRAME"); | |
168 | return; | |
169 | default: | |
170 | fprintf_unfiltered (file, "<unknown type>"); | |
171 | return; | |
172 | }; | |
173 | } | |
174 | ||
175 | static void | |
176 | fprint_frame (struct ui_file *file, struct frame_info *fi) | |
177 | { | |
178 | if (fi == NULL) | |
179 | { | |
180 | fprintf_unfiltered (file, "<NULL frame>"); | |
181 | return; | |
182 | } | |
183 | fprintf_unfiltered (file, "{"); | |
184 | fprintf_unfiltered (file, "level=%d", fi->level); | |
185 | fprintf_unfiltered (file, ","); | |
186 | fprintf_unfiltered (file, "type="); | |
187 | fprint_frame_type (file, fi->type); | |
188 | fprintf_unfiltered (file, ","); | |
189 | fprintf_unfiltered (file, "unwind="); | |
190 | if (fi->unwind != NULL) | |
191 | gdb_print_host_address (fi->unwind, file); | |
192 | else | |
193 | fprintf_unfiltered (file, "<unknown>"); | |
194 | fprintf_unfiltered (file, ","); | |
195 | fprintf_unfiltered (file, "pc="); | |
196 | if (fi->next != NULL && fi->next->prev_pc.p) | |
197 | fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_pc.value)); | |
198 | else | |
199 | fprintf_unfiltered (file, "<unknown>"); | |
200 | fprintf_unfiltered (file, ","); | |
201 | fprintf_unfiltered (file, "id="); | |
202 | if (fi->this_id.p) | |
203 | fprint_frame_id (file, fi->this_id.value); | |
204 | else | |
205 | fprintf_unfiltered (file, "<unknown>"); | |
206 | fprintf_unfiltered (file, ","); | |
207 | fprintf_unfiltered (file, "func="); | |
208 | if (fi->next != NULL && fi->next->prev_func.p) | |
209 | fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_func.addr)); | |
210 | else | |
211 | fprintf_unfiltered (file, "<unknown>"); | |
212 | fprintf_unfiltered (file, "}"); | |
213 | } | |
214 | ||
7a424e99 | 215 | /* Return a frame uniq ID that can be used to, later, re-find the |
101dcfbe AC |
216 | frame. */ |
217 | ||
7a424e99 AC |
218 | struct frame_id |
219 | get_frame_id (struct frame_info *fi) | |
101dcfbe AC |
220 | { |
221 | if (fi == NULL) | |
222 | { | |
7a424e99 | 223 | return null_frame_id; |
101dcfbe | 224 | } |
d0a55772 | 225 | if (!fi->this_id.p) |
101dcfbe | 226 | { |
06c77151 | 227 | gdb_assert (!legacy_frame_p (current_gdbarch)); |
7f78e237 AC |
228 | if (frame_debug) |
229 | fprintf_unfiltered (gdb_stdlog, "{ get_frame_id (fi=%d) ", | |
230 | fi->level); | |
c50901fd AC |
231 | /* Find the unwinder. */ |
232 | if (fi->unwind == NULL) | |
233 | { | |
e8a89fe2 | 234 | fi->unwind = frame_unwind_find_by_frame (fi->next); |
c50901fd AC |
235 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
236 | type in the frame, the unwinder's type should be returned | |
237 | directly. Unfortunatly, legacy code, called by | |
238 | legacy_get_prev_frame, explicitly set the frames type | |
239 | using the method deprecated_set_frame_type(). */ | |
240 | gdb_assert (fi->unwind->type != UNKNOWN_FRAME); | |
241 | fi->type = fi->unwind->type; | |
242 | } | |
06c77151 | 243 | /* Find THIS frame's ID. */ |
d0a55772 AC |
244 | fi->unwind->this_id (fi->next, &fi->prologue_cache, &fi->this_id.value); |
245 | fi->this_id.p = 1; | |
7f78e237 AC |
246 | if (frame_debug) |
247 | { | |
248 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
249 | fprint_frame_id (gdb_stdlog, fi->this_id.value); | |
250 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
251 | } | |
101dcfbe | 252 | } |
18adea3f | 253 | return fi->this_id.value; |
101dcfbe AC |
254 | } |
255 | ||
7a424e99 AC |
256 | const struct frame_id null_frame_id; /* All zeros. */ |
257 | ||
258 | struct frame_id | |
d0a55772 | 259 | frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr) |
7a424e99 AC |
260 | { |
261 | struct frame_id id; | |
d0a55772 AC |
262 | id.stack_addr = stack_addr; |
263 | id.code_addr = code_addr; | |
7a424e99 AC |
264 | return id; |
265 | } | |
266 | ||
267 | int | |
268 | frame_id_p (struct frame_id l) | |
269 | { | |
d0a55772 AC |
270 | int p; |
271 | /* The .code can be NULL but the .stack cannot. */ | |
272 | p = (l.stack_addr != 0); | |
7f78e237 AC |
273 | if (frame_debug) |
274 | { | |
275 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_p (l="); | |
276 | fprint_frame_id (gdb_stdlog, l); | |
277 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", p); | |
278 | } | |
d0a55772 | 279 | return p; |
7a424e99 AC |
280 | } |
281 | ||
282 | int | |
283 | frame_id_eq (struct frame_id l, struct frame_id r) | |
284 | { | |
d0a55772 AC |
285 | int eq; |
286 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
287 | /* Like a NaN, if either ID is invalid, the result is false. */ | |
288 | eq = 0; | |
289 | else if (l.stack_addr != r.stack_addr) | |
290 | /* If .stack addresses are different, the frames are different. */ | |
291 | eq = 0; | |
292 | else if (l.code_addr == 0 || r.code_addr == 0) | |
293 | /* A zero code addr is a wild card, always succeed. */ | |
294 | eq = 1; | |
295 | else if (l.code_addr == r.code_addr) | |
296 | /* The .stack and .code are identical, the ID's are identical. */ | |
297 | eq = 1; | |
298 | else | |
4aa79dcc AC |
299 | /* No luck. */ |
300 | eq = 0; | |
7f78e237 AC |
301 | if (frame_debug) |
302 | { | |
303 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (l="); | |
304 | fprint_frame_id (gdb_stdlog, l); | |
305 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
306 | fprint_frame_id (gdb_stdlog, r); | |
307 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", eq); | |
308 | } | |
d0a55772 | 309 | return eq; |
7a424e99 AC |
310 | } |
311 | ||
312 | int | |
313 | frame_id_inner (struct frame_id l, struct frame_id r) | |
314 | { | |
d0a55772 AC |
315 | int inner; |
316 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
317 | /* Like NaN, any operation involving an invalid ID always fails. */ | |
318 | inner = 0; | |
319 | else | |
320 | /* Only return non-zero when strictly inner than. Note that, per | |
321 | comment in "frame.h", there is some fuzz here. Frameless | |
322 | functions are not strictly inner than (same .stack but | |
323 | different .code). */ | |
324 | inner = INNER_THAN (l.stack_addr, r.stack_addr); | |
7f78e237 AC |
325 | if (frame_debug) |
326 | { | |
327 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_inner (l="); | |
328 | fprint_frame_id (gdb_stdlog, l); | |
329 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
330 | fprint_frame_id (gdb_stdlog, r); | |
331 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", inner); | |
332 | } | |
d0a55772 | 333 | return inner; |
7a424e99 AC |
334 | } |
335 | ||
101dcfbe AC |
336 | struct frame_info * |
337 | frame_find_by_id (struct frame_id id) | |
338 | { | |
339 | struct frame_info *frame; | |
340 | ||
341 | /* ZERO denotes the null frame, let the caller decide what to do | |
342 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 343 | if (!frame_id_p (id)) |
101dcfbe AC |
344 | return NULL; |
345 | ||
346 | for (frame = get_current_frame (); | |
347 | frame != NULL; | |
348 | frame = get_prev_frame (frame)) | |
349 | { | |
7a424e99 AC |
350 | struct frame_id this = get_frame_id (frame); |
351 | if (frame_id_eq (id, this)) | |
352 | /* An exact match. */ | |
353 | return frame; | |
354 | if (frame_id_inner (id, this)) | |
355 | /* Gone to far. */ | |
101dcfbe | 356 | return NULL; |
7a424e99 AC |
357 | /* Either, we're not yet gone far enough out along the frame |
358 | chain (inner(this,id), or we're comparing frameless functions | |
359 | (same .base, different .func, no test available). Struggle | |
360 | on until we've definitly gone to far. */ | |
101dcfbe AC |
361 | } |
362 | return NULL; | |
363 | } | |
364 | ||
f18c5a73 | 365 | CORE_ADDR |
12cc2063 | 366 | frame_pc_unwind (struct frame_info *this_frame) |
f18c5a73 | 367 | { |
d1340264 | 368 | if (!this_frame->prev_pc.p) |
f18c5a73 | 369 | { |
12cc2063 AC |
370 | CORE_ADDR pc; |
371 | if (gdbarch_unwind_pc_p (current_gdbarch)) | |
372 | { | |
373 | /* The right way. The `pure' way. The one true way. This | |
374 | method depends solely on the register-unwind code to | |
375 | determine the value of registers in THIS frame, and hence | |
376 | the value of this frame's PC (resume address). A typical | |
377 | implementation is no more than: | |
378 | ||
379 | frame_unwind_register (this_frame, ISA_PC_REGNUM, buf); | |
af1342ab | 380 | return extract_unsigned_integer (buf, size of ISA_PC_REGNUM); |
12cc2063 AC |
381 | |
382 | Note: this method is very heavily dependent on a correct | |
383 | register-unwind implementation, it pays to fix that | |
384 | method first; this method is frame type agnostic, since | |
385 | it only deals with register values, it works with any | |
386 | frame. This is all in stark contrast to the old | |
387 | FRAME_SAVED_PC which would try to directly handle all the | |
388 | different ways that a PC could be unwound. */ | |
389 | pc = gdbarch_unwind_pc (current_gdbarch, this_frame); | |
390 | } | |
391 | else if (this_frame->level < 0) | |
392 | { | |
393 | /* FIXME: cagney/2003-03-06: Old code and and a sentinel | |
394 | frame. Do like was always done. Fetch the PC's value | |
395 | direct from the global registers array (via read_pc). | |
396 | This assumes that this frame belongs to the current | |
397 | global register cache. The assumption is dangerous. */ | |
398 | pc = read_pc (); | |
399 | } | |
8bedc050 | 400 | else if (DEPRECATED_FRAME_SAVED_PC_P ()) |
12cc2063 AC |
401 | { |
402 | /* FIXME: cagney/2003-03-06: Old code, but not a sentinel | |
403 | frame. Do like was always done. Note that this method, | |
404 | unlike unwind_pc(), tries to handle all the different | |
405 | frame cases directly. It fails. */ | |
8bedc050 | 406 | pc = DEPRECATED_FRAME_SAVED_PC (this_frame); |
12cc2063 AC |
407 | } |
408 | else | |
409 | internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method"); | |
d1340264 AC |
410 | this_frame->prev_pc.value = pc; |
411 | this_frame->prev_pc.p = 1; | |
7f78e237 AC |
412 | if (frame_debug) |
413 | fprintf_unfiltered (gdb_stdlog, | |
414 | "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n", | |
415 | this_frame->level, | |
416 | paddr_nz (this_frame->prev_pc.value)); | |
f18c5a73 | 417 | } |
d1340264 | 418 | return this_frame->prev_pc.value; |
f18c5a73 AC |
419 | } |
420 | ||
be41e9f4 AC |
421 | CORE_ADDR |
422 | frame_func_unwind (struct frame_info *fi) | |
423 | { | |
424 | if (!fi->prev_func.p) | |
425 | { | |
57bfe177 AC |
426 | /* Make certain that this, and not the adjacent, function is |
427 | found. */ | |
428 | CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi); | |
be41e9f4 | 429 | fi->prev_func.p = 1; |
57bfe177 | 430 | fi->prev_func.addr = get_pc_function_start (addr_in_block); |
7f78e237 AC |
431 | if (frame_debug) |
432 | fprintf_unfiltered (gdb_stdlog, | |
433 | "{ frame_func_unwind (fi=%d) -> 0x%s }\n", | |
434 | fi->level, paddr_nz (fi->prev_func.addr)); | |
be41e9f4 AC |
435 | } |
436 | return fi->prev_func.addr; | |
437 | } | |
438 | ||
439 | CORE_ADDR | |
440 | get_frame_func (struct frame_info *fi) | |
441 | { | |
442 | return frame_func_unwind (fi->next); | |
443 | } | |
444 | ||
7a25a7c1 AC |
445 | static int |
446 | do_frame_unwind_register (void *src, int regnum, void *buf) | |
447 | { | |
448 | frame_unwind_register (src, regnum, buf); | |
449 | return 1; | |
450 | } | |
451 | ||
dbe9fe58 | 452 | void |
7a25a7c1 AC |
453 | frame_pop (struct frame_info *this_frame) |
454 | { | |
455 | struct regcache *scratch_regcache; | |
456 | struct cleanup *cleanups; | |
457 | ||
749b82f6 | 458 | if (DEPRECATED_POP_FRAME_P ()) |
7a25a7c1 AC |
459 | { |
460 | /* A legacy architecture that has implemented a custom pop | |
461 | function. All new architectures should instead be using the | |
462 | generic code below. */ | |
749b82f6 | 463 | DEPRECATED_POP_FRAME; |
7a25a7c1 AC |
464 | } |
465 | else | |
466 | { | |
467 | /* Make a copy of all the register values unwound from this | |
468 | frame. Save them in a scratch buffer so that there isn't a | |
469 | race betweening trying to extract the old values from the | |
470 | current_regcache while, at the same time writing new values | |
471 | into that same cache. */ | |
472 | struct regcache *scratch = regcache_xmalloc (current_gdbarch); | |
473 | struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch); | |
474 | regcache_save (scratch, do_frame_unwind_register, this_frame); | |
efd710d6 AC |
475 | /* FIXME: cagney/2003-03-16: It should be possible to tell the |
476 | target's register cache that it is about to be hit with a | |
477 | burst register transfer and that the sequence of register | |
478 | writes should be batched. The pair target_prepare_to_store() | |
479 | and target_store_registers() kind of suggest this | |
480 | functionality. Unfortunatly, they don't implement it. Their | |
481 | lack of a formal definition can lead to targets writing back | |
482 | bogus values (arguably a bug in the target code mind). */ | |
7a25a7c1 AC |
483 | /* Now copy those saved registers into the current regcache. |
484 | Here, regcache_cpy() calls regcache_restore(). */ | |
485 | regcache_cpy (current_regcache, scratch); | |
486 | do_cleanups (cleanups); | |
487 | } | |
488 | /* We've made right mess of GDB's local state, just discard | |
489 | everything. */ | |
dbe9fe58 AC |
490 | flush_cached_frames (); |
491 | } | |
c689142b | 492 | |
4f460812 AC |
493 | void |
494 | frame_register_unwind (struct frame_info *frame, int regnum, | |
495 | int *optimizedp, enum lval_type *lvalp, | |
496 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
497 | { | |
498 | struct frame_unwind_cache *cache; | |
499 | ||
7f78e237 AC |
500 | if (frame_debug) |
501 | { | |
502 | fprintf_unfiltered (gdb_stdlog, | |
503 | "{ frame_register_unwind (frame=%d,regnum=\"%s\",...) ", | |
eb8bc282 | 504 | frame->level, frame_map_regnum_to_name (frame, regnum)); |
7f78e237 AC |
505 | } |
506 | ||
4f460812 AC |
507 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates |
508 | that the value proper does not need to be fetched. */ | |
509 | gdb_assert (optimizedp != NULL); | |
510 | gdb_assert (lvalp != NULL); | |
511 | gdb_assert (addrp != NULL); | |
512 | gdb_assert (realnump != NULL); | |
513 | /* gdb_assert (bufferp != NULL); */ | |
514 | ||
a94dd1fd AC |
515 | /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame |
516 | is broken. There is always a frame. If there, for some reason, | |
517 | isn't, there is some pretty busted code as it should have | |
518 | detected the problem before calling here. */ | |
519 | gdb_assert (frame != NULL); | |
4f460812 | 520 | |
c50901fd AC |
521 | /* Find the unwinder. */ |
522 | if (frame->unwind == NULL) | |
523 | { | |
e8a89fe2 | 524 | frame->unwind = frame_unwind_find_by_frame (frame->next); |
c50901fd AC |
525 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
526 | type in the frame, the unwinder's type should be returned | |
527 | directly. Unfortunatly, legacy code, called by | |
528 | legacy_get_prev_frame, explicitly set the frames type using | |
529 | the method deprecated_set_frame_type(). */ | |
530 | gdb_assert (frame->unwind->type != UNKNOWN_FRAME); | |
531 | frame->type = frame->unwind->type; | |
532 | } | |
533 | ||
6dc42492 AC |
534 | /* Ask this frame to unwind its register. See comment in |
535 | "frame-unwind.h" for why NEXT frame and this unwind cace are | |
536 | passed in. */ | |
537 | frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum, | |
538 | optimizedp, lvalp, addrp, realnump, bufferp); | |
539 | ||
7f78e237 AC |
540 | if (frame_debug) |
541 | { | |
542 | fprintf_unfiltered (gdb_stdlog, "->"); | |
543 | fprintf_unfiltered (gdb_stdlog, " *optimizedp=%d", (*optimizedp)); | |
544 | fprintf_unfiltered (gdb_stdlog, " *lvalp=%d", (int) (*lvalp)); | |
545 | fprintf_unfiltered (gdb_stdlog, " *addrp=0x%s", paddr_nz ((*addrp))); | |
546 | fprintf_unfiltered (gdb_stdlog, " *bufferp="); | |
547 | if (bufferp == NULL) | |
548 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
549 | else | |
550 | { | |
551 | int i; | |
d2cf594a | 552 | const unsigned char *buf = bufferp; |
7f78e237 AC |
553 | fprintf_unfiltered (gdb_stdlog, "["); |
554 | for (i = 0; i < register_size (current_gdbarch, regnum); i++) | |
555 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); | |
556 | fprintf_unfiltered (gdb_stdlog, "]"); | |
557 | } | |
558 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
559 | } | |
4f460812 AC |
560 | } |
561 | ||
a216a322 AC |
562 | void |
563 | frame_register (struct frame_info *frame, int regnum, | |
564 | int *optimizedp, enum lval_type *lvalp, | |
565 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
566 | { | |
567 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates | |
568 | that the value proper does not need to be fetched. */ | |
569 | gdb_assert (optimizedp != NULL); | |
570 | gdb_assert (lvalp != NULL); | |
571 | gdb_assert (addrp != NULL); | |
572 | gdb_assert (realnump != NULL); | |
573 | /* gdb_assert (bufferp != NULL); */ | |
574 | ||
575 | /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset | |
576 | of the register in the register cache. It should instead return | |
577 | the REGNUM corresponding to that register. Translate the . */ | |
129c1cd6 | 578 | if (DEPRECATED_GET_SAVED_REGISTER_P ()) |
a216a322 | 579 | { |
129c1cd6 AC |
580 | DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame, |
581 | regnum, lvalp); | |
a216a322 AC |
582 | /* Compute the REALNUM if the caller wants it. */ |
583 | if (*lvalp == lval_register) | |
584 | { | |
585 | int regnum; | |
586 | for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++) | |
587 | { | |
588 | if (*addrp == register_offset_hack (current_gdbarch, regnum)) | |
589 | { | |
590 | *realnump = regnum; | |
591 | return; | |
592 | } | |
593 | } | |
594 | internal_error (__FILE__, __LINE__, | |
595 | "Failed to compute the register number corresponding" | |
596 | " to 0x%s", paddr_d (*addrp)); | |
597 | } | |
598 | *realnump = -1; | |
599 | return; | |
600 | } | |
601 | ||
a94dd1fd AC |
602 | /* Obtain the register value by unwinding the register from the next |
603 | (more inner frame). */ | |
604 | gdb_assert (frame != NULL && frame->next != NULL); | |
605 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
606 | realnump, bufferp); | |
a216a322 AC |
607 | } |
608 | ||
135c175f | 609 | void |
5b181d62 | 610 | frame_unwind_register (struct frame_info *frame, int regnum, void *buf) |
135c175f AC |
611 | { |
612 | int optimized; | |
613 | CORE_ADDR addr; | |
614 | int realnum; | |
615 | enum lval_type lval; | |
135c175f AC |
616 | frame_register_unwind (frame, regnum, &optimized, &lval, &addr, |
617 | &realnum, buf); | |
5b181d62 AC |
618 | } |
619 | ||
f0e7d0e8 AC |
620 | void |
621 | get_frame_register (struct frame_info *frame, | |
622 | int regnum, void *buf) | |
623 | { | |
624 | frame_unwind_register (frame->next, regnum, buf); | |
625 | } | |
626 | ||
627 | LONGEST | |
628 | frame_unwind_register_signed (struct frame_info *frame, int regnum) | |
629 | { | |
630 | char buf[MAX_REGISTER_SIZE]; | |
631 | frame_unwind_register (frame, regnum, buf); | |
f30992d4 | 632 | return extract_signed_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
f0e7d0e8 AC |
633 | } |
634 | ||
635 | LONGEST | |
636 | get_frame_register_signed (struct frame_info *frame, int regnum) | |
637 | { | |
638 | return frame_unwind_register_signed (frame->next, regnum); | |
639 | } | |
640 | ||
641 | ULONGEST | |
642 | frame_unwind_register_unsigned (struct frame_info *frame, int regnum) | |
643 | { | |
644 | char buf[MAX_REGISTER_SIZE]; | |
645 | frame_unwind_register (frame, regnum, buf); | |
f30992d4 | 646 | return extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
f0e7d0e8 AC |
647 | } |
648 | ||
649 | ULONGEST | |
650 | get_frame_register_unsigned (struct frame_info *frame, int regnum) | |
651 | { | |
652 | return frame_unwind_register_unsigned (frame->next, regnum); | |
653 | } | |
654 | ||
5b181d62 AC |
655 | void |
656 | frame_unwind_signed_register (struct frame_info *frame, int regnum, | |
657 | LONGEST *val) | |
658 | { | |
d9d9c31f | 659 | char buf[MAX_REGISTER_SIZE]; |
5b181d62 | 660 | frame_unwind_register (frame, regnum, buf); |
f30992d4 | 661 | (*val) = extract_signed_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
135c175f AC |
662 | } |
663 | ||
664 | void | |
665 | frame_unwind_unsigned_register (struct frame_info *frame, int regnum, | |
666 | ULONGEST *val) | |
667 | { | |
d9d9c31f | 668 | char buf[MAX_REGISTER_SIZE]; |
5b181d62 | 669 | frame_unwind_register (frame, regnum, buf); |
f30992d4 | 670 | (*val) = extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
135c175f | 671 | } |
4f460812 | 672 | |
ff2e87ac AC |
673 | void |
674 | put_frame_register (struct frame_info *frame, int regnum, const void *buf) | |
675 | { | |
676 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
677 | int realnum; | |
678 | int optim; | |
679 | enum lval_type lval; | |
680 | CORE_ADDR addr; | |
681 | frame_register (frame, regnum, &optim, &lval, &addr, &realnum, NULL); | |
682 | if (optim) | |
683 | error ("Attempt to assign to a value that was optimized out."); | |
684 | switch (lval) | |
685 | { | |
686 | case lval_memory: | |
687 | { | |
688 | /* FIXME: write_memory doesn't yet take constant buffers. | |
689 | Arrrg! */ | |
690 | char tmp[MAX_REGISTER_SIZE]; | |
691 | memcpy (tmp, buf, register_size (gdbarch, regnum)); | |
692 | write_memory (addr, tmp, register_size (gdbarch, regnum)); | |
693 | break; | |
694 | } | |
695 | case lval_register: | |
696 | regcache_cooked_write (current_regcache, realnum, buf); | |
697 | break; | |
698 | default: | |
699 | error ("Attempt to assign to an unmodifiable value."); | |
700 | } | |
701 | } | |
702 | ||
cda5a58a | 703 | /* frame_register_read () |
d65fe839 | 704 | |
cda5a58a | 705 | Find and return the value of REGNUM for the specified stack frame. |
12c266ea AC |
706 | The number of bytes copied is DEPRECATED_REGISTER_RAW_SIZE |
707 | (REGNUM). | |
d65fe839 | 708 | |
cda5a58a | 709 | Returns 0 if the register value could not be found. */ |
d65fe839 | 710 | |
cda5a58a AC |
711 | int |
712 | frame_register_read (struct frame_info *frame, int regnum, void *myaddr) | |
d65fe839 | 713 | { |
a216a322 AC |
714 | int optimized; |
715 | enum lval_type lval; | |
716 | CORE_ADDR addr; | |
717 | int realnum; | |
718 | frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr); | |
d65fe839 | 719 | |
c97dcfc7 AC |
720 | /* FIXME: cagney/2002-05-15: This test, is just bogus. |
721 | ||
722 | It indicates that the target failed to supply a value for a | |
723 | register because it was "not available" at this time. Problem | |
724 | is, the target still has the register and so get saved_register() | |
725 | may be returning a value saved on the stack. */ | |
726 | ||
d65fe839 | 727 | if (register_cached (regnum) < 0) |
cda5a58a | 728 | return 0; /* register value not available */ |
d65fe839 | 729 | |
a216a322 | 730 | return !optimized; |
d65fe839 | 731 | } |
e36180d7 AC |
732 | |
733 | ||
734 | /* Map between a frame register number and its name. A frame register | |
735 | space is a superset of the cooked register space --- it also | |
736 | includes builtin registers. */ | |
737 | ||
738 | int | |
eb8bc282 | 739 | frame_map_name_to_regnum (struct frame_info *frame, const char *name, int len) |
e36180d7 | 740 | { |
eb8bc282 | 741 | return user_reg_map_name_to_regnum (get_frame_arch (frame), name, len); |
e36180d7 AC |
742 | } |
743 | ||
744 | const char * | |
eb8bc282 | 745 | frame_map_regnum_to_name (struct frame_info *frame, int regnum) |
e36180d7 | 746 | { |
eb8bc282 | 747 | return user_reg_map_regnum_to_name (get_frame_arch (frame), regnum); |
e36180d7 | 748 | } |
4c1e7e9d | 749 | |
a94dd1fd AC |
750 | /* Create a sentinel frame. */ |
751 | ||
b9362cc7 | 752 | static struct frame_info * |
a94dd1fd AC |
753 | create_sentinel_frame (struct regcache *regcache) |
754 | { | |
755 | struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
756 | frame->type = NORMAL_FRAME; | |
757 | frame->level = -1; | |
758 | /* Explicitly initialize the sentinel frame's cache. Provide it | |
759 | with the underlying regcache. In the future additional | |
760 | information, such as the frame's thread will be added. */ | |
6dc42492 | 761 | frame->prologue_cache = sentinel_frame_cache (regcache); |
a94dd1fd AC |
762 | /* For the moment there is only one sentinel frame implementation. */ |
763 | frame->unwind = sentinel_frame_unwind; | |
764 | /* Link this frame back to itself. The frame is self referential | |
765 | (the unwound PC is the same as the pc), so make it so. */ | |
766 | frame->next = frame; | |
50bbdbd9 AC |
767 | /* Make the sentinel frame's ID valid, but invalid. That way all |
768 | comparisons with it should fail. */ | |
d0a55772 AC |
769 | frame->this_id.p = 1; |
770 | frame->this_id.value = null_frame_id; | |
7f78e237 AC |
771 | if (frame_debug) |
772 | { | |
773 | fprintf_unfiltered (gdb_stdlog, "{ create_sentinel_frame (...) -> "); | |
774 | fprint_frame (gdb_stdlog, frame); | |
775 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
776 | } | |
a94dd1fd AC |
777 | return frame; |
778 | } | |
779 | ||
4c1e7e9d AC |
780 | /* Info about the innermost stack frame (contents of FP register) */ |
781 | ||
782 | static struct frame_info *current_frame; | |
783 | ||
784 | /* Cache for frame addresses already read by gdb. Valid only while | |
785 | inferior is stopped. Control variables for the frame cache should | |
786 | be local to this module. */ | |
787 | ||
788 | static struct obstack frame_cache_obstack; | |
789 | ||
790 | void * | |
479ab5a0 | 791 | frame_obstack_zalloc (unsigned long size) |
4c1e7e9d | 792 | { |
479ab5a0 AC |
793 | void *data = obstack_alloc (&frame_cache_obstack, size); |
794 | memset (data, 0, size); | |
795 | return data; | |
4c1e7e9d AC |
796 | } |
797 | ||
6baff1d2 | 798 | CORE_ADDR * |
4c1e7e9d AC |
799 | frame_saved_regs_zalloc (struct frame_info *fi) |
800 | { | |
801 | fi->saved_regs = (CORE_ADDR *) | |
479ab5a0 | 802 | frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); |
6baff1d2 | 803 | return fi->saved_regs; |
4c1e7e9d AC |
804 | } |
805 | ||
6baff1d2 | 806 | CORE_ADDR * |
1b1d3794 | 807 | deprecated_get_frame_saved_regs (struct frame_info *fi) |
6baff1d2 AC |
808 | { |
809 | return fi->saved_regs; | |
810 | } | |
4c1e7e9d | 811 | |
a94dd1fd AC |
812 | /* Return the innermost (currently executing) stack frame. This is |
813 | split into two functions. The function unwind_to_current_frame() | |
814 | is wrapped in catch exceptions so that, even when the unwind of the | |
815 | sentinel frame fails, the function still returns a stack frame. */ | |
816 | ||
817 | static int | |
818 | unwind_to_current_frame (struct ui_out *ui_out, void *args) | |
819 | { | |
820 | struct frame_info *frame = get_prev_frame (args); | |
821 | /* A sentinel frame can fail to unwind, eg, because it's PC value | |
822 | lands in somewhere like start. */ | |
823 | if (frame == NULL) | |
824 | return 1; | |
825 | current_frame = frame; | |
826 | return 0; | |
827 | } | |
4c1e7e9d AC |
828 | |
829 | struct frame_info * | |
830 | get_current_frame (void) | |
831 | { | |
0a1e1ca1 AC |
832 | /* First check, and report, the lack of registers. Having GDB |
833 | report "No stack!" or "No memory" when the target doesn't even | |
834 | have registers is very confusing. Besides, "printcmd.exp" | |
835 | explicitly checks that ``print $pc'' with no registers prints "No | |
836 | registers". */ | |
a94dd1fd AC |
837 | if (!target_has_registers) |
838 | error ("No registers."); | |
0a1e1ca1 AC |
839 | if (!target_has_stack) |
840 | error ("No stack."); | |
a94dd1fd AC |
841 | if (!target_has_memory) |
842 | error ("No memory."); | |
4c1e7e9d AC |
843 | if (current_frame == NULL) |
844 | { | |
a94dd1fd AC |
845 | struct frame_info *sentinel_frame = |
846 | create_sentinel_frame (current_regcache); | |
847 | if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame, | |
848 | NULL, RETURN_MASK_ERROR) != 0) | |
849 | { | |
850 | /* Oops! Fake a current frame? Is this useful? It has a PC | |
851 | of zero, for instance. */ | |
852 | current_frame = sentinel_frame; | |
853 | } | |
4c1e7e9d AC |
854 | } |
855 | return current_frame; | |
856 | } | |
857 | ||
6e7f8b9c AC |
858 | /* The "selected" stack frame is used by default for local and arg |
859 | access. May be zero, for no selected frame. */ | |
860 | ||
861 | struct frame_info *deprecated_selected_frame; | |
862 | ||
863 | /* Return the selected frame. Always non-null (unless there isn't an | |
864 | inferior sufficient for creating a frame) in which case an error is | |
865 | thrown. */ | |
866 | ||
867 | struct frame_info * | |
868 | get_selected_frame (void) | |
869 | { | |
870 | if (deprecated_selected_frame == NULL) | |
871 | /* Hey! Don't trust this. It should really be re-finding the | |
872 | last selected frame of the currently selected thread. This, | |
873 | though, is better than nothing. */ | |
874 | select_frame (get_current_frame ()); | |
875 | /* There is always a frame. */ | |
876 | gdb_assert (deprecated_selected_frame != NULL); | |
877 | return deprecated_selected_frame; | |
878 | } | |
879 | ||
7dd88986 DJ |
880 | /* This is a variant of get_selected_frame which can be called when |
881 | the inferior does not have a frame; in that case it will return | |
882 | NULL instead of calling error (). */ | |
883 | ||
884 | struct frame_info * | |
885 | deprecated_safe_get_selected_frame (void) | |
886 | { | |
887 | if (!target_has_registers || !target_has_stack || !target_has_memory) | |
888 | return NULL; | |
889 | return get_selected_frame (); | |
890 | } | |
891 | ||
6e7f8b9c AC |
892 | /* Select frame FI (or NULL - to invalidate the current frame). */ |
893 | ||
894 | void | |
895 | select_frame (struct frame_info *fi) | |
896 | { | |
52f0bd74 | 897 | struct symtab *s; |
6e7f8b9c AC |
898 | |
899 | deprecated_selected_frame = fi; | |
900 | /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the | |
901 | frame is being invalidated. */ | |
902 | if (selected_frame_level_changed_hook) | |
903 | selected_frame_level_changed_hook (frame_relative_level (fi)); | |
904 | ||
905 | /* FIXME: kseitz/2002-08-28: It would be nice to call | |
906 | selected_frame_level_changed_event right here, but due to limitations | |
907 | in the current interfaces, we would end up flooding UIs with events | |
908 | because select_frame is used extensively internally. | |
909 | ||
910 | Once we have frame-parameterized frame (and frame-related) commands, | |
911 | the event notification can be moved here, since this function will only | |
912 | be called when the users selected frame is being changed. */ | |
913 | ||
914 | /* Ensure that symbols for this frame are read in. Also, determine the | |
915 | source language of this frame, and switch to it if desired. */ | |
916 | if (fi) | |
917 | { | |
11889732 | 918 | s = find_pc_symtab (get_frame_pc (fi)); |
6e7f8b9c AC |
919 | if (s |
920 | && s->language != current_language->la_language | |
921 | && s->language != language_unknown | |
922 | && language_mode == language_mode_auto) | |
923 | { | |
924 | set_language (s->language); | |
925 | } | |
926 | } | |
927 | } | |
928 | ||
4c1e7e9d AC |
929 | /* Return the register saved in the simplistic ``saved_regs'' cache. |
930 | If the value isn't here AND a value is needed, try the next inner | |
931 | most frame. */ | |
932 | ||
933 | static void | |
6dc42492 AC |
934 | legacy_saved_regs_prev_register (struct frame_info *next_frame, |
935 | void **this_prologue_cache, | |
936 | int regnum, int *optimizedp, | |
937 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
938 | int *realnump, void *bufferp) | |
4c1e7e9d | 939 | { |
6dc42492 AC |
940 | /* HACK: New code is passed the next frame and this cache. |
941 | Unfortunatly, old code expects this frame. Since this is a | |
942 | backward compatibility hack, cheat by walking one level along the | |
943 | prologue chain to the frame the old code expects. | |
944 | ||
945 | Do not try this at home. Professional driver, closed course. */ | |
946 | struct frame_info *frame = next_frame->prev; | |
4c1e7e9d | 947 | gdb_assert (frame != NULL); |
4c1e7e9d | 948 | |
1b1d3794 | 949 | if (deprecated_get_frame_saved_regs (frame) == NULL) |
870b3035 AC |
950 | { |
951 | /* If nothing's initialized the saved regs, do it now. */ | |
952 | gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()); | |
953 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); | |
1b1d3794 | 954 | gdb_assert (deprecated_get_frame_saved_regs (frame) != NULL); |
870b3035 | 955 | } |
4c1e7e9d | 956 | |
1b1d3794 AC |
957 | if (deprecated_get_frame_saved_regs (frame) != NULL |
958 | && deprecated_get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d AC |
959 | { |
960 | if (regnum == SP_REGNUM) | |
961 | { | |
962 | /* SP register treated specially. */ | |
963 | *optimizedp = 0; | |
964 | *lvalp = not_lval; | |
965 | *addrp = 0; | |
966 | *realnump = -1; | |
967 | if (bufferp != NULL) | |
fbd9dcd3 AC |
968 | /* NOTE: cagney/2003-05-09: In-lined store_address with |
969 | it's body - store_unsigned_integer. */ | |
12c266ea | 970 | store_unsigned_integer (bufferp, DEPRECATED_REGISTER_RAW_SIZE (regnum), |
1b1d3794 | 971 | deprecated_get_frame_saved_regs (frame)[regnum]); |
4c1e7e9d AC |
972 | } |
973 | else | |
974 | { | |
975 | /* Any other register is saved in memory, fetch it but cache | |
976 | a local copy of its value. */ | |
977 | *optimizedp = 0; | |
978 | *lvalp = lval_memory; | |
1b1d3794 | 979 | *addrp = deprecated_get_frame_saved_regs (frame)[regnum]; |
4c1e7e9d AC |
980 | *realnump = -1; |
981 | if (bufferp != NULL) | |
982 | { | |
983 | #if 1 | |
984 | /* Save each register value, as it is read in, in a | |
985 | frame based cache. */ | |
6dc42492 | 986 | void **regs = (*this_prologue_cache); |
4c1e7e9d AC |
987 | if (regs == NULL) |
988 | { | |
989 | int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS) | |
990 | * sizeof (void *)); | |
479ab5a0 | 991 | regs = frame_obstack_zalloc (sizeof_cache); |
6dc42492 | 992 | (*this_prologue_cache) = regs; |
4c1e7e9d AC |
993 | } |
994 | if (regs[regnum] == NULL) | |
995 | { | |
996 | regs[regnum] | |
12c266ea | 997 | = frame_obstack_zalloc (DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
1b1d3794 | 998 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], regs[regnum], |
12c266ea | 999 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d | 1000 | } |
12c266ea | 1001 | memcpy (bufferp, regs[regnum], DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
1002 | #else |
1003 | /* Read the value in from memory. */ | |
1b1d3794 | 1004 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], bufferp, |
12c266ea | 1005 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
1006 | #endif |
1007 | } | |
1008 | } | |
1009 | return; | |
1010 | } | |
1011 | ||
6dc42492 AC |
1012 | /* No luck. Assume this and the next frame have the same register |
1013 | value. Pass the unwind request down the frame chain to the next | |
1014 | frame. Hopefully that frame will find the register's location. */ | |
1015 | frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp, | |
1016 | realnump, bufferp); | |
4c1e7e9d AC |
1017 | } |
1018 | ||
c170fb60 | 1019 | static void |
6dc42492 AC |
1020 | legacy_saved_regs_this_id (struct frame_info *next_frame, |
1021 | void **this_prologue_cache, | |
1022 | struct frame_id *id) | |
c689142b | 1023 | { |
18adea3f AC |
1024 | /* legacy_get_prev_frame() always sets ->this_id.p, hence this is |
1025 | never needed. */ | |
1026 | internal_error (__FILE__, __LINE__, "legacy_saved_regs_this_id() called"); | |
c689142b AC |
1027 | } |
1028 | ||
6dc42492 | 1029 | const struct frame_unwind legacy_saved_regs_unwinder = { |
7df05f2b AC |
1030 | /* Not really. It gets overridden by legacy_get_prev_frame. */ |
1031 | UNKNOWN_FRAME, | |
6dc42492 AC |
1032 | legacy_saved_regs_this_id, |
1033 | legacy_saved_regs_prev_register | |
494cca16 | 1034 | }; |
6dc42492 | 1035 | const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder; |
494cca16 AC |
1036 | |
1037 | ||
ac2adee5 | 1038 | /* Function: deprecated_generic_get_saved_register |
4c1e7e9d | 1039 | Find register number REGNUM relative to FRAME and put its (raw, |
ac2adee5 | 1040 | target format) contents in *RAW_BUFFER. |
4c1e7e9d AC |
1041 | |
1042 | Set *OPTIMIZED if the variable was optimized out (and thus can't be | |
1043 | fetched). Note that this is never set to anything other than zero | |
1044 | in this implementation. | |
1045 | ||
1046 | Set *LVAL to lval_memory, lval_register, or not_lval, depending on | |
1047 | whether the value was fetched from memory, from a register, or in a | |
1048 | strange and non-modifiable way (e.g. a frame pointer which was | |
1049 | calculated rather than fetched). We will use not_lval for values | |
1050 | fetched from generic dummy frames. | |
1051 | ||
62700349 AC |
1052 | Set *ADDRP to the address, either in memory or as a |
1053 | DEPRECATED_REGISTER_BYTE offset into the registers array. If the | |
1054 | value is stored in a dummy frame, set *ADDRP to zero. | |
4c1e7e9d | 1055 | |
4c1e7e9d AC |
1056 | The argument RAW_BUFFER must point to aligned memory. */ |
1057 | ||
1058 | void | |
1059 | deprecated_generic_get_saved_register (char *raw_buffer, int *optimized, | |
1060 | CORE_ADDR *addrp, | |
1061 | struct frame_info *frame, int regnum, | |
1062 | enum lval_type *lval) | |
1063 | { | |
1064 | if (!target_has_registers) | |
1065 | error ("No registers."); | |
1066 | ||
1067 | /* Normal systems don't optimize out things with register numbers. */ | |
1068 | if (optimized != NULL) | |
1069 | *optimized = 0; | |
1070 | ||
1071 | if (addrp) /* default assumption: not found in memory */ | |
1072 | *addrp = 0; | |
1073 | ||
1074 | /* Note: since the current frame's registers could only have been | |
1075 | saved by frames INTERIOR TO the current frame, we skip examining | |
1076 | the current frame itself: otherwise, we would be getting the | |
1077 | previous frame's registers which were saved by the current frame. */ | |
1078 | ||
a94dd1fd | 1079 | if (frame != NULL) |
4c1e7e9d | 1080 | { |
a94dd1fd AC |
1081 | for (frame = get_next_frame (frame); |
1082 | frame_relative_level (frame) >= 0; | |
1083 | frame = get_next_frame (frame)) | |
4c1e7e9d | 1084 | { |
a94dd1fd | 1085 | if (get_frame_type (frame) == DUMMY_FRAME) |
4c1e7e9d | 1086 | { |
a94dd1fd AC |
1087 | if (lval) /* found it in a CALL_DUMMY frame */ |
1088 | *lval = not_lval; | |
1089 | if (raw_buffer) | |
1090 | /* FIXME: cagney/2002-06-26: This should be via the | |
1091 | gdbarch_register_read() method so that it, on the | |
1092 | fly, constructs either a raw or pseudo register | |
1093 | from the raw register cache. */ | |
1094 | regcache_raw_read | |
cc8c88f3 AC |
1095 | (deprecated_find_dummy_frame_regcache (get_frame_pc (frame), |
1096 | get_frame_base (frame)), | |
a94dd1fd AC |
1097 | regnum, raw_buffer); |
1098 | return; | |
4c1e7e9d | 1099 | } |
a94dd1fd | 1100 | |
f30ee0bc | 1101 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); |
1b1d3794 AC |
1102 | if (deprecated_get_frame_saved_regs (frame) != NULL |
1103 | && deprecated_get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d | 1104 | { |
a94dd1fd AC |
1105 | if (lval) /* found it saved on the stack */ |
1106 | *lval = lval_memory; | |
1107 | if (regnum == SP_REGNUM) | |
1108 | { | |
1109 | if (raw_buffer) /* SP register treated specially */ | |
fbd9dcd3 AC |
1110 | /* NOTE: cagney/2003-05-09: In-line store_address |
1111 | with it's body - store_unsigned_integer. */ | |
1112 | store_unsigned_integer (raw_buffer, | |
12c266ea | 1113 | DEPRECATED_REGISTER_RAW_SIZE (regnum), |
1b1d3794 | 1114 | deprecated_get_frame_saved_regs (frame)[regnum]); |
a94dd1fd AC |
1115 | } |
1116 | else | |
1117 | { | |
1118 | if (addrp) /* any other register */ | |
1b1d3794 | 1119 | *addrp = deprecated_get_frame_saved_regs (frame)[regnum]; |
a94dd1fd | 1120 | if (raw_buffer) |
1b1d3794 | 1121 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], raw_buffer, |
12c266ea | 1122 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
a94dd1fd AC |
1123 | } |
1124 | return; | |
4c1e7e9d | 1125 | } |
4c1e7e9d AC |
1126 | } |
1127 | } | |
1128 | ||
1129 | /* If we get thru the loop to this point, it means the register was | |
1130 | not saved in any frame. Return the actual live-register value. */ | |
1131 | ||
1132 | if (lval) /* found it in a live register */ | |
1133 | *lval = lval_register; | |
1134 | if (addrp) | |
62700349 | 1135 | *addrp = DEPRECATED_REGISTER_BYTE (regnum); |
4c1e7e9d AC |
1136 | if (raw_buffer) |
1137 | deprecated_read_register_gen (regnum, raw_buffer); | |
1138 | } | |
1139 | ||
eb4f72c5 AC |
1140 | /* Determine the frame's type based on its PC. */ |
1141 | ||
1142 | static enum frame_type | |
1143 | frame_type_from_pc (CORE_ADDR pc) | |
1144 | { | |
1145 | /* FIXME: cagney/2002-11-24: Can't yet directly call | |
1146 | pc_in_dummy_frame() as some architectures don't set | |
1147 | PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the | |
1148 | latter is implemented by simply calling pc_in_dummy_frame). */ | |
1149 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES | |
1150 | && DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) | |
1151 | return DUMMY_FRAME; | |
1152 | else | |
1153 | { | |
1154 | char *name; | |
1155 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1156 | if (PC_IN_SIGTRAMP (pc, name)) | |
1157 | return SIGTRAMP_FRAME; | |
1158 | else | |
1159 | return NORMAL_FRAME; | |
1160 | } | |
1161 | } | |
1162 | ||
4c1e7e9d AC |
1163 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. |
1164 | Always returns a non-NULL value. */ | |
1165 | ||
1166 | struct frame_info * | |
1167 | create_new_frame (CORE_ADDR addr, CORE_ADDR pc) | |
1168 | { | |
1169 | struct frame_info *fi; | |
4c1e7e9d | 1170 | |
7f78e237 AC |
1171 | if (frame_debug) |
1172 | { | |
1173 | fprintf_unfiltered (gdb_stdlog, | |
1174 | "{ create_new_frame (addr=0x%s, pc=0x%s) ", | |
1175 | paddr_nz (addr), paddr_nz (pc)); | |
1176 | } | |
1177 | ||
479ab5a0 | 1178 | fi = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d | 1179 | |
a94dd1fd | 1180 | fi->next = create_sentinel_frame (current_regcache); |
7df05f2b AC |
1181 | |
1182 | /* Select/initialize both the unwind function and the frame's type | |
1183 | based on the PC. */ | |
e8a89fe2 | 1184 | fi->unwind = frame_unwind_find_by_frame (fi->next); |
7df05f2b AC |
1185 | if (fi->unwind->type != UNKNOWN_FRAME) |
1186 | fi->type = fi->unwind->type; | |
1187 | else | |
1188 | fi->type = frame_type_from_pc (pc); | |
1189 | ||
18adea3f | 1190 | fi->this_id.p = 1; |
11889732 AC |
1191 | deprecated_update_frame_base_hack (fi, addr); |
1192 | deprecated_update_frame_pc_hack (fi, pc); | |
4c1e7e9d | 1193 | |
e9582e71 AC |
1194 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1195 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi); | |
4c1e7e9d | 1196 | |
7f78e237 AC |
1197 | if (frame_debug) |
1198 | { | |
1199 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1200 | fprint_frame (gdb_stdlog, fi); | |
1201 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1202 | } | |
1203 | ||
4c1e7e9d AC |
1204 | return fi; |
1205 | } | |
1206 | ||
03febf99 AC |
1207 | /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the |
1208 | innermost frame). Be careful to not fall off the bottom of the | |
1209 | frame chain and onto the sentinel frame. */ | |
4c1e7e9d AC |
1210 | |
1211 | struct frame_info * | |
03febf99 | 1212 | get_next_frame (struct frame_info *this_frame) |
4c1e7e9d | 1213 | { |
03febf99 AC |
1214 | if (this_frame->level > 0) |
1215 | return this_frame->next; | |
a94dd1fd AC |
1216 | else |
1217 | return NULL; | |
4c1e7e9d AC |
1218 | } |
1219 | ||
870b3035 AC |
1220 | struct frame_info * |
1221 | deprecated_get_next_frame_hack (struct frame_info *this_frame) | |
1222 | { | |
1223 | return this_frame->next; | |
1224 | } | |
1225 | ||
4c1e7e9d AC |
1226 | /* Flush the entire frame cache. */ |
1227 | ||
1228 | void | |
1229 | flush_cached_frames (void) | |
1230 | { | |
1231 | /* Since we can't really be sure what the first object allocated was */ | |
1232 | obstack_free (&frame_cache_obstack, 0); | |
1233 | obstack_init (&frame_cache_obstack); | |
1234 | ||
1235 | current_frame = NULL; /* Invalidate cache */ | |
1236 | select_frame (NULL); | |
1237 | annotate_frames_invalid (); | |
7f78e237 AC |
1238 | if (frame_debug) |
1239 | fprintf_unfiltered (gdb_stdlog, "{ flush_cached_frames () }\n"); | |
4c1e7e9d AC |
1240 | } |
1241 | ||
1242 | /* Flush the frame cache, and start a new one if necessary. */ | |
1243 | ||
1244 | void | |
1245 | reinit_frame_cache (void) | |
1246 | { | |
1247 | flush_cached_frames (); | |
1248 | ||
1249 | /* FIXME: The inferior_ptid test is wrong if there is a corefile. */ | |
1250 | if (PIDGET (inferior_ptid) != 0) | |
1251 | { | |
1252 | select_frame (get_current_frame ()); | |
1253 | } | |
1254 | } | |
1255 | ||
eb4f72c5 AC |
1256 | /* Create the previous frame using the deprecated methods |
1257 | INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */ | |
4c1e7e9d | 1258 | |
eb4f72c5 | 1259 | static struct frame_info * |
03febf99 | 1260 | legacy_get_prev_frame (struct frame_info *this_frame) |
4c1e7e9d AC |
1261 | { |
1262 | CORE_ADDR address = 0; | |
1263 | struct frame_info *prev; | |
95adb866 | 1264 | int fromleaf; |
4c1e7e9d | 1265 | |
7f78e237 AC |
1266 | /* Don't frame_debug print legacy_get_prev_frame() here, just |
1267 | confuses the output. */ | |
1268 | ||
a01dd7cc | 1269 | /* Allocate the new frame. |
055bb976 AC |
1270 | |
1271 | There is no reason to worry about memory leaks, should the | |
1272 | remainder of the function fail. The allocated memory will be | |
1273 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1274 | been here before' check, in get_prev_frame will stop repeated | |
1275 | memory allocation calls. */ | |
1276 | prev = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
1277 | prev->level = this_frame->level + 1; | |
1278 | ||
a01dd7cc AC |
1279 | /* Do not completly wire it in to the frame chain. Some (bad) code |
1280 | in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull | |
1281 | some fancy tricks (of course such code is, by definition, | |
1282 | recursive). | |
1283 | ||
1284 | On the other hand, methods, such as get_frame_pc() and | |
1285 | get_frame_base() rely on being able to walk along the frame | |
1286 | chain. Make certain that at least they work by providing that | |
1287 | link. Of course things manipulating prev can't go back. */ | |
1288 | prev->next = this_frame; | |
1289 | ||
055bb976 AC |
1290 | /* NOTE: cagney/2002-11-18: Should have been correctly setting the |
1291 | frame's type here, before anything else, and not last, at the | |
1292 | bottom of this function. The various | |
1293 | DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC, | |
1294 | DEPRECATED_INIT_FRAME_PC_FIRST and | |
1295 | DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds | |
1296 | that handle the frame not being correctly set from the start. | |
1297 | Unfortunatly those same work-arounds rely on the type defaulting | |
1298 | to NORMAL_FRAME. Ulgh! The new frame code does not have this | |
1299 | problem. */ | |
7df05f2b | 1300 | prev->type = UNKNOWN_FRAME; |
055bb976 | 1301 | |
06c77151 | 1302 | /* A legacy frame's ID is always computed here. Mark it as valid. */ |
d0a55772 | 1303 | prev->this_id.p = 1; |
06c77151 | 1304 | |
055bb976 AC |
1305 | /* Handle sentinel frame unwind as a special case. */ |
1306 | if (this_frame->level < 0) | |
1307 | { | |
1308 | /* Try to unwind the PC. If that doesn't work, assume we've reached | |
1309 | the oldest frame and simply return. Is there a better sentinal | |
1310 | value? The unwound PC value is then used to initialize the new | |
1311 | previous frame's type. | |
1312 | ||
1313 | Note that the pc-unwind is intentionally performed before the | |
1314 | frame chain. This is ok since, for old targets, both | |
618ce49f AC |
1315 | frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and |
1316 | DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures | |
1317 | have already been initialized (using | |
055bb976 AC |
1318 | DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order |
1319 | doesn't matter. | |
1320 | ||
1321 | By unwinding the PC first, it becomes possible to, in the case of | |
1322 | a dummy frame, avoid also unwinding the frame ID. This is | |
1323 | because (well ignoring the PPC) a dummy frame can be located | |
1324 | using THIS_FRAME's frame ID. */ | |
1325 | ||
11889732 AC |
1326 | deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame)); |
1327 | if (get_frame_pc (prev) == 0) | |
055bb976 AC |
1328 | { |
1329 | /* The allocated PREV_FRAME will be reclaimed when the frame | |
1330 | obstack is next purged. */ | |
1331 | if (frame_debug) | |
7f78e237 AC |
1332 | { |
1333 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1334 | fprint_frame (gdb_stdlog, NULL); | |
1335 | fprintf_unfiltered (gdb_stdlog, | |
1336 | " // unwound legacy PC zero }\n"); | |
1337 | } | |
055bb976 AC |
1338 | return NULL; |
1339 | } | |
055bb976 | 1340 | |
7df05f2b AC |
1341 | /* Set the unwind functions based on that identified PC. Ditto |
1342 | for the "type" but strongly prefer the unwinder's frame type. */ | |
e8a89fe2 | 1343 | prev->unwind = frame_unwind_find_by_frame (prev->next); |
7df05f2b | 1344 | if (prev->unwind->type == UNKNOWN_FRAME) |
d1340264 | 1345 | prev->type = frame_type_from_pc (get_frame_pc (prev)); |
7df05f2b AC |
1346 | else |
1347 | prev->type = prev->unwind->type; | |
055bb976 AC |
1348 | |
1349 | /* Find the prev's frame's ID. */ | |
1350 | if (prev->type == DUMMY_FRAME | |
1351 | && gdbarch_unwind_dummy_id_p (current_gdbarch)) | |
1352 | { | |
1353 | /* When unwinding a normal frame, the stack structure is | |
1354 | determined by analyzing the frame's function's code (be | |
1355 | it using brute force prologue analysis, or the dwarf2 | |
1356 | CFI). In the case of a dummy frame, that simply isn't | |
1357 | possible. The The PC is either the program entry point, | |
1358 | or some random address on the stack. Trying to use that | |
1359 | PC to apply standard frame ID unwind techniques is just | |
1360 | asking for trouble. */ | |
055bb976 AC |
1361 | /* Use an architecture specific method to extract the prev's |
1362 | dummy ID from the next frame. Note that this method uses | |
1363 | frame_register_unwind to obtain the register values | |
1364 | needed to determine the dummy frame's ID. */ | |
d0a55772 AC |
1365 | prev->this_id.value = gdbarch_unwind_dummy_id (current_gdbarch, |
1366 | this_frame); | |
055bb976 AC |
1367 | } |
1368 | else | |
1369 | { | |
1370 | /* We're unwinding a sentinel frame, the PC of which is | |
1371 | pointing at a stack dummy. Fake up the dummy frame's ID | |
1372 | using the same sequence as is found a traditional | |
1373 | unwinder. Once all architectures supply the | |
1374 | unwind_dummy_id method, this code can go away. */ | |
0ba6dca9 AC |
1375 | prev->this_id.value = frame_id_build (deprecated_read_fp (), |
1376 | read_pc ()); | |
055bb976 AC |
1377 | } |
1378 | ||
1379 | /* Check that the unwound ID is valid. */ | |
d0a55772 | 1380 | if (!frame_id_p (prev->this_id.value)) |
055bb976 AC |
1381 | { |
1382 | if (frame_debug) | |
7f78e237 AC |
1383 | { |
1384 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1385 | fprint_frame (gdb_stdlog, NULL); | |
1386 | fprintf_unfiltered (gdb_stdlog, | |
1387 | " // unwound legacy ID invalid }\n"); | |
1388 | } | |
055bb976 AC |
1389 | return NULL; |
1390 | } | |
1391 | ||
1392 | /* Check that the new frame isn't inner to (younger, below, | |
1393 | next) the old frame. If that happens the frame unwind is | |
1394 | going backwards. */ | |
1395 | /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since | |
1396 | that doesn't have a valid frame ID. Should instead set the | |
1397 | sentinel frame's frame ID to a `sentinel'. Leave it until | |
1398 | after the switch to storing the frame ID, instead of the | |
1399 | frame base, in the frame object. */ | |
1400 | ||
055bb976 AC |
1401 | /* Link it in. */ |
1402 | this_frame->prev = prev; | |
055bb976 AC |
1403 | |
1404 | /* FIXME: cagney/2002-01-19: This call will go away. Instead of | |
1405 | initializing extra info, all frames will use the frame_cache | |
1406 | (passed to the unwind functions) to store additional frame | |
1407 | info. Unfortunatly legacy targets can't use | |
1408 | legacy_get_prev_frame() to unwind the sentinel frame and, | |
1409 | consequently, are forced to take this code path and rely on | |
1410 | the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to | |
1411 | initialize the inner-most frame. */ | |
1412 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) | |
1413 | { | |
1414 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev); | |
1415 | } | |
18adea3f AC |
1416 | |
1417 | if (prev->type == NORMAL_FRAME) | |
1418 | prev->this_id.value.code_addr | |
1419 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1420 | ||
7f78e237 AC |
1421 | if (frame_debug) |
1422 | { | |
1423 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1424 | fprint_frame (gdb_stdlog, prev); | |
1425 | fprintf_unfiltered (gdb_stdlog, " } // legacy innermost frame\n"); | |
1426 | } | |
055bb976 AC |
1427 | return prev; |
1428 | } | |
1429 | ||
eb4f72c5 AC |
1430 | /* This code only works on normal frames. A sentinel frame, where |
1431 | the level is -1, should never reach this code. */ | |
03febf99 | 1432 | gdb_assert (this_frame->level >= 0); |
4c1e7e9d AC |
1433 | |
1434 | /* On some machines it is possible to call a function without | |
1435 | setting up a stack frame for it. On these machines, we | |
1436 | define this macro to take two args; a frameinfo pointer | |
1437 | identifying a frame and a variable to set or clear if it is | |
1438 | or isn't leafless. */ | |
1439 | ||
1440 | /* Still don't want to worry about this except on the innermost | |
03febf99 | 1441 | frame. This macro will set FROMLEAF if THIS_FRAME is a frameless |
95adb866 | 1442 | function invocation. */ |
03febf99 | 1443 | if (this_frame->level == 0) |
95adb866 AC |
1444 | /* FIXME: 2002-11-09: Frameless functions can occure anywhere in |
1445 | the frame chain, not just the inner most frame! The generic, | |
1446 | per-architecture, frame code should handle this and the below | |
1447 | should simply be removed. */ | |
03febf99 | 1448 | fromleaf = FRAMELESS_FUNCTION_INVOCATION (this_frame); |
95adb866 AC |
1449 | else |
1450 | fromleaf = 0; | |
1451 | ||
1452 | if (fromleaf) | |
1453 | /* A frameless inner-most frame. The `FP' (which isn't an | |
1454 | architecture frame-pointer register!) of the caller is the same | |
1455 | as the callee. */ | |
1456 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
1457 | edge condition. Instead the per-architecture code should hande | |
1458 | it locally. */ | |
870b3035 AC |
1459 | /* FIXME: cagney/2003-06-16: This returns the inner most stack |
1460 | address for the previous frame, that, however, is wrong. It | |
1461 | should be the inner most stack address for the previous to | |
1462 | previous frame. This is because it is the previous to previous | |
1463 | frame's innermost stack address that is constant through out | |
1464 | the lifetime of the previous frame (trust me :-). */ | |
03febf99 | 1465 | address = get_frame_base (this_frame); |
95adb866 | 1466 | else |
4c1e7e9d AC |
1467 | { |
1468 | /* Two macros defined in tm.h specify the machine-dependent | |
1469 | actions to be performed here. | |
95adb866 | 1470 | |
4c1e7e9d | 1471 | First, get the frame's chain-pointer. |
95adb866 | 1472 | |
4c1e7e9d AC |
1473 | If that is zero, the frame is the outermost frame or a leaf |
1474 | called by the outermost frame. This means that if start | |
1475 | calls main without a frame, we'll return 0 (which is fine | |
1476 | anyway). | |
1477 | ||
1478 | Nope; there's a problem. This also returns when the current | |
1479 | routine is a leaf of main. This is unacceptable. We move | |
1480 | this to after the ffi test; I'd rather have backtraces from | |
1481 | start go curfluy than have an abort called from main not show | |
1482 | main. */ | |
870b3035 AC |
1483 | if (DEPRECATED_FRAME_CHAIN_P ()) |
1484 | address = DEPRECATED_FRAME_CHAIN (this_frame); | |
1485 | else | |
1486 | { | |
1487 | /* Someone is part way through coverting an old architecture | |
1488 | to the new frame code. Implement FRAME_CHAIN the way the | |
1489 | new frame will. */ | |
1490 | /* Find PREV frame's unwinder. */ | |
e8a89fe2 | 1491 | prev->unwind = frame_unwind_find_by_frame (this_frame->next); |
870b3035 AC |
1492 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
1493 | type in the frame, the unwinder's type should be returned | |
1494 | directly. Unfortunatly, legacy code, called by | |
1495 | legacy_get_prev_frame, explicitly set the frames type | |
1496 | using the method deprecated_set_frame_type(). */ | |
1497 | prev->type = prev->unwind->type; | |
1498 | /* Find PREV frame's ID. */ | |
1499 | prev->unwind->this_id (this_frame, | |
1500 | &prev->prologue_cache, | |
1501 | &prev->this_id.value); | |
1502 | prev->this_id.p = 1; | |
1503 | address = prev->this_id.value.stack_addr; | |
1504 | } | |
4c1e7e9d | 1505 | |
e6ba3bc9 | 1506 | if (!legacy_frame_chain_valid (address, this_frame)) |
7f78e237 AC |
1507 | { |
1508 | if (frame_debug) | |
1509 | { | |
1510 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1511 | fprint_frame (gdb_stdlog, NULL); | |
1512 | fprintf_unfiltered (gdb_stdlog, | |
1513 | " // legacy frame chain invalid }\n"); | |
1514 | } | |
1515 | return NULL; | |
1516 | } | |
4c1e7e9d AC |
1517 | } |
1518 | if (address == 0) | |
7f78e237 AC |
1519 | { |
1520 | if (frame_debug) | |
1521 | { | |
1522 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1523 | fprint_frame (gdb_stdlog, NULL); | |
1524 | fprintf_unfiltered (gdb_stdlog, | |
1525 | " // legacy frame chain NULL }\n"); | |
1526 | } | |
1527 | return NULL; | |
1528 | } | |
4c1e7e9d | 1529 | |
055bb976 | 1530 | /* Link in the already allocated prev frame. */ |
03febf99 | 1531 | this_frame->prev = prev; |
11889732 | 1532 | deprecated_update_frame_base_hack (prev, address); |
4c1e7e9d | 1533 | |
95adb866 | 1534 | /* This change should not be needed, FIXME! We should determine |
a5afb99f | 1535 | whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen |
e9582e71 AC |
1536 | after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple |
1537 | way to express what goes on here. | |
95adb866 | 1538 | |
e9582e71 AC |
1539 | DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places: |
1540 | create_new_frame (where the PC is already set up) and here (where | |
1541 | it isn't). DEPRECATED_INIT_FRAME_PC is only called from here, | |
1542 | always after DEPRECATED_INIT_EXTRA_FRAME_INFO. | |
95adb866 | 1543 | |
e9582e71 AC |
1544 | The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO |
1545 | requires the PC value (which hasn't been set yet). Some other | |
1546 | machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO | |
1547 | before they can do DEPRECATED_INIT_FRAME_PC. Phoo. | |
95adb866 | 1548 | |
2ca6c561 AC |
1549 | We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more |
1550 | complication to an already overcomplicated part of GDB. | |
1551 | gnu@cygnus.com, 15Sep92. | |
95adb866 | 1552 | |
a5afb99f | 1553 | Assuming that some machines need DEPRECATED_INIT_FRAME_PC after |
e9582e71 | 1554 | DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme: |
95adb866 AC |
1555 | |
1556 | SETUP_INNERMOST_FRAME(): Default version is just create_new_frame | |
0ba6dca9 AC |
1557 | (deprecated_read_fp ()), read_pc ()). Machines with extra frame |
1558 | info would do that (or the local equivalent) and then set the | |
1559 | extra fields. | |
95adb866 AC |
1560 | |
1561 | SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that | |
1562 | create_new_frame would no longer init extra frame info; | |
1563 | SETUP_ARBITRARY_FRAME would have to do that. | |
1564 | ||
e9582e71 AC |
1565 | INIT_PREV_FRAME(fromleaf, prev) Replace |
1566 | DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC. | |
1567 | This should also return a flag saying whether to keep the new | |
1568 | frame, or whether to discard it, because on some machines (e.g. | |
618ce49f AC |
1569 | mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID |
1570 | called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good | |
1571 | way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID | |
1572 | into the extra fields of the new frame). std_frame_pc(fromleaf, | |
1573 | prev) | |
95adb866 AC |
1574 | |
1575 | This is the default setting for INIT_PREV_FRAME. It just does | |
a5afb99f AC |
1576 | what the default DEPRECATED_INIT_FRAME_PC does. Some machines |
1577 | will call it from INIT_PREV_FRAME (either at the beginning, the | |
1578 | end, or in the middle). Some machines won't use it. | |
95adb866 AC |
1579 | |
1580 | kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */ | |
1581 | ||
1582 | /* NOTE: cagney/2002-11-09: Just ignore the above! There is no | |
1583 | reason for things to be this complicated. | |
1584 | ||
1585 | The trick is to assume that there is always a frame. Instead of | |
1586 | special casing the inner-most frame, create fake frame | |
1587 | (containing the hardware registers) that is inner to the | |
1588 | user-visible inner-most frame (...) and then unwind from that. | |
1589 | That way architecture code can use use the standard | |
1590 | frame_XX_unwind() functions and not differentiate between the | |
1591 | inner most and any other case. | |
1592 | ||
1593 | Since there is always a frame to unwind from, there is always | |
03febf99 | 1594 | somewhere (THIS_FRAME) to store all the info needed to construct |
95adb866 AC |
1595 | a new (previous) frame without having to first create it. This |
1596 | means that the convolution below - needing to carefully order a | |
1597 | frame's initialization - isn't needed. | |
1598 | ||
618ce49f AC |
1599 | The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least |
1600 | for a more up-to-date architecture, always calls | |
1601 | FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but | |
1602 | without first needing the frame! Instead of the convolution | |
1603 | below, we could have simply called FRAME_SAVED_PC() and been done | |
1604 | with it! Note that FRAME_SAVED_PC() is being superseed by | |
1605 | frame_pc_unwind() and that function does have somewhere to cache | |
1606 | that PC value. */ | |
4c1e7e9d | 1607 | |
2ca6c561 | 1608 | if (DEPRECATED_INIT_FRAME_PC_FIRST_P ()) |
11889732 AC |
1609 | deprecated_update_frame_pc_hack (prev, |
1610 | DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf, | |
1611 | prev)); | |
4c1e7e9d | 1612 | |
e9582e71 AC |
1613 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1614 | DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev); | |
4c1e7e9d AC |
1615 | |
1616 | /* This entry is in the frame queue now, which is good since | |
95adb866 AC |
1617 | FRAME_SAVED_PC may use that queue to figure out its value (see |
1618 | tm-sparc.h). We want the pc saved in the inferior frame. */ | |
a5afb99f | 1619 | if (DEPRECATED_INIT_FRAME_PC_P ()) |
11889732 AC |
1620 | deprecated_update_frame_pc_hack (prev, |
1621 | DEPRECATED_INIT_FRAME_PC (fromleaf, | |
1622 | prev)); | |
4c1e7e9d | 1623 | |
95adb866 AC |
1624 | /* If ->frame and ->pc are unchanged, we are in the process of |
1625 | getting ourselves into an infinite backtrace. Some architectures | |
618ce49f AC |
1626 | check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems |
1627 | like there is no reason this can't be an architecture-independent | |
1628 | check. */ | |
11889732 AC |
1629 | if (get_frame_base (prev) == get_frame_base (this_frame) |
1630 | && get_frame_pc (prev) == get_frame_pc (this_frame)) | |
4c1e7e9d | 1631 | { |
03febf99 | 1632 | this_frame->prev = NULL; |
95adb866 | 1633 | obstack_free (&frame_cache_obstack, prev); |
7f78e237 AC |
1634 | if (frame_debug) |
1635 | { | |
1636 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1637 | fprint_frame (gdb_stdlog, NULL); | |
1638 | fprintf_unfiltered (gdb_stdlog, | |
1639 | " // legacy this.id == prev.id }\n"); | |
1640 | } | |
95adb866 | 1641 | return NULL; |
4c1e7e9d AC |
1642 | } |
1643 | ||
1644 | /* Initialize the code used to unwind the frame PREV based on the PC | |
1645 | (and probably other architectural information). The PC lets you | |
1646 | check things like the debug info at that point (dwarf2cfi?) and | |
870b3035 AC |
1647 | use that to decide how the frame should be unwound. |
1648 | ||
1649 | If there isn't a FRAME_CHAIN, the code above will have already | |
1650 | done this. */ | |
1651 | if (prev->unwind == NULL) | |
e8a89fe2 | 1652 | prev->unwind = frame_unwind_find_by_frame (prev->next); |
4c1e7e9d | 1653 | |
7df05f2b AC |
1654 | /* If the unwinder provides a frame type, use it. Otherwize |
1655 | continue on to that heuristic mess. */ | |
1656 | if (prev->unwind->type != UNKNOWN_FRAME) | |
1657 | { | |
1658 | prev->type = prev->unwind->type; | |
18adea3f | 1659 | if (prev->type == NORMAL_FRAME) |
870b3035 | 1660 | /* FIXME: cagney/2003-06-16: would get_frame_pc() be better? */ |
18adea3f AC |
1661 | prev->this_id.value.code_addr |
1662 | = get_pc_function_start (prev->this_id.value.code_addr); | |
7f78e237 AC |
1663 | if (frame_debug) |
1664 | { | |
1665 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1666 | fprint_frame (gdb_stdlog, prev); | |
1667 | fprintf_unfiltered (gdb_stdlog, " } // legacy with unwound type\n"); | |
1668 | } | |
7df05f2b AC |
1669 | return prev; |
1670 | } | |
1671 | ||
5a203e44 AC |
1672 | /* NOTE: cagney/2002-11-18: The code segments, found in |
1673 | create_new_frame and get_prev_frame(), that initializes the | |
1674 | frames type is subtly different. The latter only updates ->type | |
1675 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops | |
1676 | get_prev_frame() overriding the frame's type when the INIT code | |
1677 | has previously set it. This is really somewhat bogus. The | |
1678 | initialization, as seen in create_new_frame(), should occur | |
1679 | before the INIT function has been called. */ | |
07555a72 | 1680 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
ae45cd16 | 1681 | && (DEPRECATED_PC_IN_CALL_DUMMY_P () |
11889732 AC |
1682 | ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev), 0, 0) |
1683 | : pc_in_dummy_frame (get_frame_pc (prev)))) | |
5a203e44 AC |
1684 | prev->type = DUMMY_FRAME; |
1685 | else | |
1686 | { | |
1687 | /* FIXME: cagney/2002-11-10: This should be moved to before the | |
1688 | INIT code above so that the INIT code knows what the frame's | |
1689 | type is (in fact, for a [generic] dummy-frame, the type can | |
1690 | be set and then the entire initialization can be skipped. | |
1691 | Unforunatly, its the INIT code that sets the PC (Hmm, catch | |
1692 | 22). */ | |
1693 | char *name; | |
11889732 AC |
1694 | find_pc_partial_function (get_frame_pc (prev), &name, NULL, NULL); |
1695 | if (PC_IN_SIGTRAMP (get_frame_pc (prev), name)) | |
5a203e44 AC |
1696 | prev->type = SIGTRAMP_FRAME; |
1697 | /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some | |
1698 | architectures are forcing the frame's type in INIT so we | |
1699 | don't want to override it here. Remember, NORMAL_FRAME == 0, | |
1700 | so it all works (just :-/). Once this initialization is | |
1701 | moved to the start of this function, all this nastness will | |
1702 | go away. */ | |
1703 | } | |
4c1e7e9d | 1704 | |
18adea3f AC |
1705 | if (prev->type == NORMAL_FRAME) |
1706 | prev->this_id.value.code_addr | |
1707 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1708 | ||
7f78e237 AC |
1709 | if (frame_debug) |
1710 | { | |
1711 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1712 | fprint_frame (gdb_stdlog, prev); | |
1713 | fprintf_unfiltered (gdb_stdlog, " } // legacy with confused type\n"); | |
1714 | } | |
1715 | ||
4c1e7e9d AC |
1716 | return prev; |
1717 | } | |
1718 | ||
eb4f72c5 | 1719 | /* Return a structure containing various interesting information |
03febf99 | 1720 | about the frame that called THIS_FRAME. Returns NULL |
eb4f72c5 AC |
1721 | if there is no such frame. */ |
1722 | ||
1723 | struct frame_info * | |
03febf99 | 1724 | get_prev_frame (struct frame_info *this_frame) |
eb4f72c5 AC |
1725 | { |
1726 | struct frame_info *prev_frame; | |
1727 | ||
7f78e237 AC |
1728 | if (frame_debug) |
1729 | { | |
1730 | fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame="); | |
1731 | if (this_frame != NULL) | |
1732 | fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level); | |
1733 | else | |
1734 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
1735 | fprintf_unfiltered (gdb_stdlog, ") "); | |
1736 | } | |
1737 | ||
eb4f72c5 AC |
1738 | /* Return the inner-most frame, when the caller passes in NULL. */ |
1739 | /* NOTE: cagney/2002-11-09: Not sure how this would happen. The | |
1740 | caller should have previously obtained a valid frame using | |
1741 | get_selected_frame() and then called this code - only possibility | |
1742 | I can think of is code behaving badly. | |
1743 | ||
1744 | NOTE: cagney/2003-01-10: Talk about code behaving badly. Check | |
1745 | block_innermost_frame(). It does the sequence: frame = NULL; | |
1746 | while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why | |
1747 | it couldn't be written better, I don't know. | |
1748 | ||
1749 | NOTE: cagney/2003-01-11: I suspect what is happening is | |
1750 | block_innermost_frame() is, when the target has no state | |
1751 | (registers, memory, ...), still calling this function. The | |
1752 | assumption being that this function will return NULL indicating | |
1753 | that a frame isn't possible, rather than checking that the target | |
1754 | has state and then calling get_current_frame() and | |
1755 | get_prev_frame(). This is a guess mind. */ | |
03febf99 | 1756 | if (this_frame == NULL) |
eb4f72c5 AC |
1757 | { |
1758 | /* NOTE: cagney/2002-11-09: There was a code segment here that | |
1759 | would error out when CURRENT_FRAME was NULL. The comment | |
1760 | that went with it made the claim ... | |
1761 | ||
1762 | ``This screws value_of_variable, which just wants a nice | |
1763 | clean NULL return from block_innermost_frame if there are no | |
1764 | frames. I don't think I've ever seen this message happen | |
1765 | otherwise. And returning NULL here is a perfectly legitimate | |
1766 | thing to do.'' | |
1767 | ||
1768 | Per the above, this code shouldn't even be called with a NULL | |
03febf99 | 1769 | THIS_FRAME. */ |
eb4f72c5 AC |
1770 | return current_frame; |
1771 | } | |
1772 | ||
1773 | /* There is always a frame. If this assertion fails, suspect that | |
1774 | something should be calling get_selected_frame() or | |
1775 | get_current_frame(). */ | |
03febf99 | 1776 | gdb_assert (this_frame != NULL); |
eb4f72c5 | 1777 | |
03febf99 | 1778 | if (this_frame->level >= 0 |
25d29d70 | 1779 | && !backtrace_past_main |
03febf99 | 1780 | && inside_main_func (get_frame_pc (this_frame))) |
eb4f72c5 AC |
1781 | /* Don't unwind past main(), bug always unwind the sentinel frame. |
1782 | Note, this is done _before_ the frame has been marked as | |
1783 | previously unwound. That way if the user later decides to | |
1784 | allow unwinds past main(), that just happens. */ | |
ac2bd0a9 AC |
1785 | { |
1786 | if (frame_debug) | |
7f78e237 | 1787 | fprintf_unfiltered (gdb_stdlog, "-> NULL // inside main func }\n"); |
ac2bd0a9 AC |
1788 | return NULL; |
1789 | } | |
eb4f72c5 | 1790 | |
25d29d70 AC |
1791 | if (this_frame->level > backtrace_limit) |
1792 | { | |
1793 | error ("Backtrace limit of %d exceeded", backtrace_limit); | |
1794 | } | |
1795 | ||
0714963c AC |
1796 | /* If we're already inside the entry function for the main objfile, |
1797 | then it isn't valid. Don't apply this test to a dummy frame - | |
1798 | dummy frame PC's typically land in the entry func. Don't apply | |
1799 | this test to the sentinel frame. Sentinel frames should always | |
1800 | be allowed to unwind. */ | |
1801 | /* NOTE: cagney/2003-02-25: Don't enable until someone has found | |
1802 | hard evidence that this is needed. */ | |
1803 | /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func - wasn't | |
1804 | checking for "main" in the minimal symbols. With that fixed | |
1805 | asm-source tests now stop in "main" instead of halting the | |
1806 | backtrace in wierd and wonderful ways somewhere inside the entry | |
627b3ba2 AC |
1807 | file. Suspect that deprecated_inside_entry_file and |
1808 | inside_entry_func tests were added to work around that (now | |
1809 | fixed) case. */ | |
0714963c AC |
1810 | /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right) |
1811 | suggested having the inside_entry_func test use the | |
1812 | inside_main_func msymbol trick (along with entry_point_address I | |
1813 | guess) to determine the address range of the start function. | |
1814 | That should provide a far better stopper than the current | |
1815 | heuristics. */ | |
1816 | /* NOTE: cagney/2003-07-15: Need to add a "set backtrace | |
1817 | beyond-entry-func" command so that this can be selectively | |
1818 | disabled. */ | |
1819 | if (0 | |
1820 | #if 0 | |
1821 | && backtrace_beyond_entry_func | |
1822 | #endif | |
1823 | && this_frame->type != DUMMY_FRAME && this_frame->level >= 0 | |
1824 | && inside_entry_func (get_frame_pc (this_frame))) | |
1825 | { | |
1826 | if (frame_debug) | |
1827 | { | |
1828 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1829 | fprint_frame (gdb_stdlog, NULL); | |
1830 | fprintf_unfiltered (gdb_stdlog, "// inside entry func }\n"); | |
1831 | } | |
1832 | return NULL; | |
1833 | } | |
1834 | ||
eb4f72c5 | 1835 | /* Only try to do the unwind once. */ |
03febf99 | 1836 | if (this_frame->prev_p) |
7f78e237 AC |
1837 | { |
1838 | if (frame_debug) | |
1839 | { | |
1840 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1841 | fprint_frame (gdb_stdlog, this_frame->prev); | |
1842 | fprintf_unfiltered (gdb_stdlog, " // cached \n"); | |
1843 | } | |
1844 | return this_frame->prev; | |
1845 | } | |
03febf99 | 1846 | this_frame->prev_p = 1; |
eb4f72c5 | 1847 | |
b14185ce AC |
1848 | /* If we're inside the entry file, it isn't valid. Don't apply this |
1849 | test to a dummy frame - dummy frame PC's typically land in the | |
1850 | entry file. Don't apply this test to the sentinel frame. | |
1851 | Sentinel frames should always be allowed to unwind. */ | |
eb4f72c5 AC |
1852 | /* NOTE: drow/2002-12-25: should there be a way to disable this |
1853 | check? It assumes a single small entry file, and the way some | |
1854 | debug readers (e.g. dbxread) figure out which object is the | |
1855 | entry file is somewhat hokey. */ | |
1856 | /* NOTE: cagney/2003-01-10: If there is a way of disabling this test | |
1857 | then it should probably be moved to before the ->prev_p test, | |
1858 | above. */ | |
627b3ba2 AC |
1859 | /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call |
1860 | to deprecated_inside_entry_file destroys a meaningful backtrace | |
1861 | under some conditions. E. g. the backtrace tests in the | |
1862 | asm-source testcase are broken for some targets. In this test | |
1863 | the functions are all implemented as part of one file and the | |
1864 | testcase is not necessarily linked with a start file (depending | |
1865 | on the target). What happens is, that the first frame is printed | |
1866 | normaly and following frames are treated as being inside the | |
1867 | enttry file then. This way, only the #0 frame is printed in the | |
1868 | backtrace output. */ | |
1869 | if (0 | |
1870 | && this_frame->type != DUMMY_FRAME && this_frame->level >= 0 | |
1871 | && deprecated_inside_entry_file (get_frame_pc (this_frame))) | |
ac2bd0a9 AC |
1872 | { |
1873 | if (frame_debug) | |
7f78e237 AC |
1874 | { |
1875 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1876 | fprint_frame (gdb_stdlog, NULL); | |
1877 | fprintf_unfiltered (gdb_stdlog, " // inside entry file }\n"); | |
1878 | } | |
eb4f72c5 | 1879 | return NULL; |
ac2bd0a9 | 1880 | } |
eb4f72c5 AC |
1881 | |
1882 | /* If any of the old frame initialization methods are around, use | |
055bb976 AC |
1883 | the legacy get_prev_frame method. */ |
1884 | if (legacy_frame_p (current_gdbarch)) | |
ac2bd0a9 | 1885 | { |
03febf99 | 1886 | prev_frame = legacy_get_prev_frame (this_frame); |
ac2bd0a9 AC |
1887 | return prev_frame; |
1888 | } | |
eb4f72c5 | 1889 | |
270c3b1d AC |
1890 | /* Check that this frame's ID was valid. If it wasn't, don't try to |
1891 | unwind to the prev frame. Be careful to not apply this test to | |
1892 | the sentinel frame. */ | |
1893 | if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame))) | |
1894 | { | |
1895 | if (frame_debug) | |
7f78e237 AC |
1896 | { |
1897 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1898 | fprint_frame (gdb_stdlog, NULL); | |
1899 | fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n"); | |
1900 | } | |
270c3b1d AC |
1901 | return NULL; |
1902 | } | |
1903 | ||
1904 | /* Check that this frame's ID isn't inner to (younger, below, next) | |
612dde91 AC |
1905 | the next frame. This happens when a frame unwind goes backwards. |
1906 | Since the sentinel frame doesn't really exist, don't compare the | |
1907 | inner-most against that sentinel. */ | |
270c3b1d AC |
1908 | if (this_frame->level > 0 |
1909 | && frame_id_inner (get_frame_id (this_frame), | |
1910 | get_frame_id (this_frame->next))) | |
612dde91 AC |
1911 | error ("Previous frame inner to this frame (corrupt stack?)"); |
1912 | ||
1913 | /* Check that this and the next frame are not identical. If they | |
1914 | are, there is most likely a stack cycle. As with the inner-than | |
1915 | test above, avoid comparing the inner-most and sentinel frames. */ | |
1916 | if (this_frame->level > 0 | |
270c3b1d AC |
1917 | && frame_id_eq (get_frame_id (this_frame), |
1918 | get_frame_id (this_frame->next))) | |
612dde91 | 1919 | error ("Previous frame identical to this frame (corrupt stack?)"); |
270c3b1d | 1920 | |
eb4f72c5 AC |
1921 | /* Allocate the new frame but do not wire it in to the frame chain. |
1922 | Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along | |
1923 | frame->next to pull some fancy tricks (of course such code is, by | |
1924 | definition, recursive). Try to prevent it. | |
1925 | ||
1926 | There is no reason to worry about memory leaks, should the | |
1927 | remainder of the function fail. The allocated memory will be | |
1928 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1929 | been here before' check above will stop repeated memory | |
1930 | allocation calls. */ | |
1931 | prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
03febf99 | 1932 | prev_frame->level = this_frame->level + 1; |
eb4f72c5 AC |
1933 | |
1934 | /* Try to unwind the PC. If that doesn't work, assume we've reached | |
1935 | the oldest frame and simply return. Is there a better sentinal | |
1936 | value? The unwound PC value is then used to initialize the new | |
1937 | previous frame's type. | |
1938 | ||
1939 | Note that the pc-unwind is intentionally performed before the | |
1940 | frame chain. This is ok since, for old targets, both | |
618ce49f AC |
1941 | frame_pc_unwind (nee, FRAME_SAVED_PC) and |
1942 | DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures | |
1943 | have already been initialized (using | |
e9582e71 AC |
1944 | DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order |
1945 | doesn't matter. | |
eb4f72c5 AC |
1946 | |
1947 | By unwinding the PC first, it becomes possible to, in the case of | |
1948 | a dummy frame, avoid also unwinding the frame ID. This is | |
1949 | because (well ignoring the PPC) a dummy frame can be located | |
03febf99 | 1950 | using THIS_FRAME's frame ID. */ |
eb4f72c5 | 1951 | |
d1340264 | 1952 | if (frame_pc_unwind (this_frame) == 0) |
ac2bd0a9 AC |
1953 | { |
1954 | /* The allocated PREV_FRAME will be reclaimed when the frame | |
1955 | obstack is next purged. */ | |
1956 | if (frame_debug) | |
7f78e237 AC |
1957 | { |
1958 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1959 | fprint_frame (gdb_stdlog, NULL); | |
1960 | fprintf_unfiltered (gdb_stdlog, " // unwound PC zero }\n"); | |
1961 | } | |
ac2bd0a9 AC |
1962 | return NULL; |
1963 | } | |
eb4f72c5 | 1964 | |
c50901fd AC |
1965 | /* Don't yet compute ->unwind (and hence ->type). It is computed |
1966 | on-demand in get_frame_type, frame_register_unwind, and | |
1967 | get_frame_id. */ | |
eb4f72c5 | 1968 | |
c50901fd AC |
1969 | /* Don't yet compute the frame's ID. It is computed on-demand by |
1970 | get_frame_id(). */ | |
6dc42492 | 1971 | |
270c3b1d AC |
1972 | /* The unwound frame ID is validate at the start of this function, |
1973 | as part of the logic to decide if that frame should be further | |
1974 | unwound, and not here while the prev frame is being created. | |
1975 | Doing this makes it possible for the user to examine a frame that | |
1976 | has an invalid frame ID. | |
1977 | ||
25e3a86b AC |
1978 | Some very old VAX code noted: [...] For the sake of argument, |
1979 | suppose that the stack is somewhat trashed (which is one reason | |
1980 | that "info frame" exists). So, return 0 (indicating we don't | |
1981 | know the address of the arglist) if we don't know what frame this | |
1982 | frame calls. */ | |
6dc42492 | 1983 | |
eb4f72c5 | 1984 | /* Link it in. */ |
03febf99 AC |
1985 | this_frame->prev = prev_frame; |
1986 | prev_frame->next = this_frame; | |
eb4f72c5 | 1987 | |
7f78e237 AC |
1988 | if (frame_debug) |
1989 | { | |
1990 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1991 | fprint_frame (gdb_stdlog, prev_frame); | |
1992 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1993 | } | |
1994 | ||
eb4f72c5 AC |
1995 | return prev_frame; |
1996 | } | |
1997 | ||
4c1e7e9d AC |
1998 | CORE_ADDR |
1999 | get_frame_pc (struct frame_info *frame) | |
2000 | { | |
d1340264 AC |
2001 | gdb_assert (frame->next != NULL); |
2002 | return frame_pc_unwind (frame->next); | |
4c1e7e9d AC |
2003 | } |
2004 | ||
8edd5d01 AC |
2005 | /* Return an address of that falls within the frame's code block. */ |
2006 | ||
2007 | CORE_ADDR | |
2008 | frame_unwind_address_in_block (struct frame_info *next_frame) | |
2009 | { | |
2010 | /* A draft address. */ | |
2011 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
2012 | ||
2013 | /* If THIS frame is not inner most (i.e., NEXT isn't the sentinel), | |
2014 | and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS | |
2015 | frame's PC ends up pointing at the instruction fallowing the | |
2016 | "call". Adjust that PC value so that it falls on the call | |
2017 | instruction (which, hopefully, falls within THIS frame's code | |
2018 | block. So far it's proved to be a very good approximation. See | |
2019 | get_frame_type for why ->type can't be used. */ | |
2020 | if (next_frame->level >= 0 | |
2021 | && get_frame_type (next_frame) == NORMAL_FRAME) | |
2022 | --pc; | |
2023 | return pc; | |
2024 | } | |
2025 | ||
2026 | CORE_ADDR | |
2027 | get_frame_address_in_block (struct frame_info *this_frame) | |
2028 | { | |
2029 | return frame_unwind_address_in_block (this_frame->next); | |
2030 | } | |
2031 | ||
1058bca7 AC |
2032 | static int |
2033 | pc_notcurrent (struct frame_info *frame) | |
2034 | { | |
2035 | /* If FRAME is not the innermost frame, that normally means that | |
2036 | FRAME->pc points at the return instruction (which is *after* the | |
2037 | call instruction), and we want to get the line containing the | |
2038 | call (because the call is where the user thinks the program is). | |
2039 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
2040 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
2041 | PC and such a PC indicates the current (rather than next) | |
2042 | instruction/line, consequently, for such cases, want to get the | |
2043 | line containing fi->pc. */ | |
2044 | struct frame_info *next = get_next_frame (frame); | |
2045 | int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME); | |
2046 | return notcurrent; | |
2047 | } | |
2048 | ||
2049 | void | |
2050 | find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal) | |
2051 | { | |
11889732 | 2052 | (*sal) = find_pc_line (get_frame_pc (frame), pc_notcurrent (frame)); |
1058bca7 AC |
2053 | } |
2054 | ||
c193f6ac AC |
2055 | /* Per "frame.h", return the ``address'' of the frame. Code should |
2056 | really be using get_frame_id(). */ | |
2057 | CORE_ADDR | |
2058 | get_frame_base (struct frame_info *fi) | |
2059 | { | |
d0a55772 | 2060 | return get_frame_id (fi).stack_addr; |
c193f6ac AC |
2061 | } |
2062 | ||
da62e633 AC |
2063 | /* High-level offsets into the frame. Used by the debug info. */ |
2064 | ||
2065 | CORE_ADDR | |
2066 | get_frame_base_address (struct frame_info *fi) | |
2067 | { | |
7df05f2b | 2068 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2069 | return 0; |
2070 | if (fi->base == NULL) | |
e8a89fe2 | 2071 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2072 | /* Sneaky: If the low-level unwind and high-level base code share a |
2073 | common unwinder, let them share the prologue cache. */ | |
2074 | if (fi->base->unwind == fi->unwind) | |
2075 | return fi->base->this_base (fi->next, &fi->prologue_cache); | |
2076 | return fi->base->this_base (fi->next, &fi->base_cache); | |
2077 | } | |
2078 | ||
2079 | CORE_ADDR | |
2080 | get_frame_locals_address (struct frame_info *fi) | |
2081 | { | |
2082 | void **cache; | |
7df05f2b | 2083 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2084 | return 0; |
2085 | /* If there isn't a frame address method, find it. */ | |
2086 | if (fi->base == NULL) | |
e8a89fe2 | 2087 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2088 | /* Sneaky: If the low-level unwind and high-level base code share a |
2089 | common unwinder, let them share the prologue cache. */ | |
2090 | if (fi->base->unwind == fi->unwind) | |
2091 | cache = &fi->prologue_cache; | |
2092 | else | |
2093 | cache = &fi->base_cache; | |
2094 | return fi->base->this_locals (fi->next, cache); | |
2095 | } | |
2096 | ||
2097 | CORE_ADDR | |
2098 | get_frame_args_address (struct frame_info *fi) | |
2099 | { | |
2100 | void **cache; | |
7df05f2b | 2101 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2102 | return 0; |
2103 | /* If there isn't a frame address method, find it. */ | |
2104 | if (fi->base == NULL) | |
e8a89fe2 | 2105 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
2106 | /* Sneaky: If the low-level unwind and high-level base code share a |
2107 | common unwinder, let them share the prologue cache. */ | |
2108 | if (fi->base->unwind == fi->unwind) | |
2109 | cache = &fi->prologue_cache; | |
2110 | else | |
2111 | cache = &fi->base_cache; | |
2112 | return fi->base->this_args (fi->next, cache); | |
2113 | } | |
2114 | ||
85cf597a AC |
2115 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
2116 | or -1 for a NULL frame. */ | |
2117 | ||
2118 | int | |
2119 | frame_relative_level (struct frame_info *fi) | |
2120 | { | |
2121 | if (fi == NULL) | |
2122 | return -1; | |
2123 | else | |
2124 | return fi->level; | |
2125 | } | |
2126 | ||
5a203e44 AC |
2127 | enum frame_type |
2128 | get_frame_type (struct frame_info *frame) | |
2129 | { | |
2130 | /* Some targets still don't use [generic] dummy frames. Catch them | |
2131 | here. */ | |
07555a72 | 2132 | if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
5a203e44 AC |
2133 | && deprecated_frame_in_dummy (frame)) |
2134 | return DUMMY_FRAME; | |
710ee10a KB |
2135 | |
2136 | /* Some legacy code, e.g, mips_init_extra_frame_info() wants | |
2137 | to determine the frame's type prior to it being completely | |
2138 | initialized. Don't attempt to lazily initialize ->unwind for | |
2139 | legacy code. It will be initialized in legacy_get_prev_frame(). */ | |
2140 | if (frame->unwind == NULL && !legacy_frame_p (current_gdbarch)) | |
c50901fd AC |
2141 | { |
2142 | /* Initialize the frame's unwinder because it is that which | |
2143 | provides the frame's type. */ | |
e8a89fe2 | 2144 | frame->unwind = frame_unwind_find_by_frame (frame->next); |
c50901fd AC |
2145 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's |
2146 | type in the frame, the unwinder's type should be returned | |
2147 | directly. Unfortunatly, legacy code, called by | |
2148 | legacy_get_prev_frame, explicitly set the frames type using | |
2149 | the method deprecated_set_frame_type(). */ | |
2150 | gdb_assert (frame->unwind->type != UNKNOWN_FRAME); | |
2151 | frame->type = frame->unwind->type; | |
2152 | } | |
7df05f2b AC |
2153 | if (frame->type == UNKNOWN_FRAME) |
2154 | return NORMAL_FRAME; | |
2155 | else | |
2156 | return frame->type; | |
5a203e44 AC |
2157 | } |
2158 | ||
2159 | void | |
2160 | deprecated_set_frame_type (struct frame_info *frame, enum frame_type type) | |
2161 | { | |
2162 | /* Arrrg! See comment in "frame.h". */ | |
2163 | frame->type = type; | |
2164 | } | |
2165 | ||
0394eb2a AC |
2166 | struct frame_extra_info * |
2167 | get_frame_extra_info (struct frame_info *fi) | |
2168 | { | |
2169 | return fi->extra_info; | |
2170 | } | |
2171 | ||
2c517d0e AC |
2172 | struct frame_extra_info * |
2173 | frame_extra_info_zalloc (struct frame_info *fi, long size) | |
2174 | { | |
479ab5a0 | 2175 | fi->extra_info = frame_obstack_zalloc (size); |
2c517d0e AC |
2176 | return fi->extra_info; |
2177 | } | |
2178 | ||
b87efeee | 2179 | void |
2f107107 | 2180 | deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc) |
b87efeee | 2181 | { |
7f78e237 AC |
2182 | if (frame_debug) |
2183 | fprintf_unfiltered (gdb_stdlog, | |
2184 | "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n", | |
2185 | frame->level, paddr_nz (pc)); | |
e0d2ae16 AC |
2186 | /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are |
2187 | maintaining a locally allocated frame object. Since such frame's | |
2188 | are not in the frame chain, it isn't possible to assume that the | |
2189 | frame has a next. Sigh. */ | |
2190 | if (frame->next != NULL) | |
2191 | { | |
2192 | /* While we're at it, update this frame's cached PC value, found | |
2193 | in the next frame. Oh for the day when "struct frame_info" | |
2194 | is opaque and this hack on hack can just go away. */ | |
d1340264 AC |
2195 | frame->next->prev_pc.value = pc; |
2196 | frame->next->prev_pc.p = 1; | |
e0d2ae16 | 2197 | } |
2f107107 AC |
2198 | } |
2199 | ||
2200 | void | |
2201 | deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base) | |
2202 | { | |
7f78e237 AC |
2203 | if (frame_debug) |
2204 | fprintf_unfiltered (gdb_stdlog, | |
2205 | "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n", | |
2206 | frame->level, paddr_nz (base)); | |
2f107107 | 2207 | /* See comment in "frame.h". */ |
d0a55772 | 2208 | frame->this_id.value.stack_addr = base; |
b87efeee AC |
2209 | } |
2210 | ||
c8b8a898 AC |
2211 | void |
2212 | deprecated_set_frame_saved_regs_hack (struct frame_info *frame, | |
2213 | CORE_ADDR *saved_regs) | |
2214 | { | |
2215 | frame->saved_regs = saved_regs; | |
2216 | } | |
2217 | ||
2218 | void | |
2219 | deprecated_set_frame_extra_info_hack (struct frame_info *frame, | |
2220 | struct frame_extra_info *extra_info) | |
2221 | { | |
2222 | frame->extra_info = extra_info; | |
2223 | } | |
2224 | ||
483d36b2 AC |
2225 | void |
2226 | deprecated_set_frame_next_hack (struct frame_info *fi, | |
2227 | struct frame_info *next) | |
2228 | { | |
2229 | fi->next = next; | |
2230 | } | |
2231 | ||
2232 | void | |
2233 | deprecated_set_frame_prev_hack (struct frame_info *fi, | |
2234 | struct frame_info *prev) | |
2235 | { | |
2236 | fi->prev = prev; | |
2237 | } | |
2238 | ||
2d75187b AC |
2239 | struct context * |
2240 | deprecated_get_frame_context (struct frame_info *fi) | |
2241 | { | |
2242 | return fi->context; | |
2243 | } | |
2244 | ||
2245 | void | |
2246 | deprecated_set_frame_context (struct frame_info *fi, | |
2247 | struct context *context) | |
2248 | { | |
2249 | fi->context = context; | |
2250 | } | |
2251 | ||
c8b8a898 AC |
2252 | struct frame_info * |
2253 | deprecated_frame_xmalloc (void) | |
2254 | { | |
bcf7d3ca AC |
2255 | struct frame_info *frame = XMALLOC (struct frame_info); |
2256 | memset (frame, 0, sizeof (*frame)); | |
18adea3f | 2257 | frame->this_id.p = 1; |
c8b8a898 AC |
2258 | return frame; |
2259 | } | |
2260 | ||
f6c609c4 AC |
2261 | struct frame_info * |
2262 | deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs, | |
2263 | long sizeof_extra_info) | |
2264 | { | |
2265 | struct frame_info *frame = deprecated_frame_xmalloc (); | |
2266 | make_cleanup (xfree, frame); | |
2267 | if (sizeof_saved_regs > 0) | |
2268 | { | |
2269 | frame->saved_regs = xcalloc (1, sizeof_saved_regs); | |
2270 | make_cleanup (xfree, frame->saved_regs); | |
2271 | } | |
2272 | if (sizeof_extra_info > 0) | |
2273 | { | |
2274 | frame->extra_info = xcalloc (1, sizeof_extra_info); | |
2275 | make_cleanup (xfree, frame->extra_info); | |
2276 | } | |
2277 | return frame; | |
2278 | } | |
c8b8a898 | 2279 | |
ae1e7417 AC |
2280 | /* Memory access methods. */ |
2281 | ||
2282 | void | |
2283 | get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, void *buf, | |
2284 | int len) | |
2285 | { | |
2286 | read_memory (addr, buf, len); | |
2287 | } | |
2288 | ||
2289 | LONGEST | |
2290 | get_frame_memory_signed (struct frame_info *this_frame, CORE_ADDR addr, | |
2291 | int len) | |
2292 | { | |
2293 | return read_memory_integer (addr, len); | |
2294 | } | |
2295 | ||
2296 | ULONGEST | |
2297 | get_frame_memory_unsigned (struct frame_info *this_frame, CORE_ADDR addr, | |
2298 | int len) | |
2299 | { | |
2300 | return read_memory_unsigned_integer (addr, len); | |
2301 | } | |
2302 | ||
2303 | /* Architecture method. */ | |
2304 | ||
2305 | struct gdbarch * | |
2306 | get_frame_arch (struct frame_info *this_frame) | |
2307 | { | |
2308 | return current_gdbarch; | |
2309 | } | |
2310 | ||
a9e5fdc2 AC |
2311 | /* Stack pointer methods. */ |
2312 | ||
2313 | CORE_ADDR | |
2314 | get_frame_sp (struct frame_info *this_frame) | |
2315 | { | |
2316 | return frame_sp_unwind (this_frame->next); | |
2317 | } | |
2318 | ||
2319 | CORE_ADDR | |
2320 | frame_sp_unwind (struct frame_info *next_frame) | |
2321 | { | |
2322 | /* Normality, an architecture that provides a way of obtaining any | |
2323 | frame inner-most address. */ | |
2324 | if (gdbarch_unwind_sp_p (current_gdbarch)) | |
2325 | return gdbarch_unwind_sp (current_gdbarch, next_frame); | |
2326 | /* Things are looking grim. If it's the inner-most frame and there | |
2327 | is a TARGET_READ_SP then that can be used. */ | |
2328 | if (next_frame->level < 0 && TARGET_READ_SP_P ()) | |
2329 | return TARGET_READ_SP (); | |
2330 | /* Now things are really are grim. Hope that the value returned by | |
2331 | the SP_REGNUM register is meaningful. */ | |
2332 | if (SP_REGNUM >= 0) | |
2333 | { | |
2334 | ULONGEST sp; | |
2335 | frame_unwind_unsigned_register (next_frame, SP_REGNUM, &sp); | |
2336 | return sp; | |
2337 | } | |
2338 | internal_error (__FILE__, __LINE__, "Missing unwind SP method"); | |
2339 | } | |
2340 | ||
2341 | ||
1594fa56 AC |
2342 | int |
2343 | legacy_frame_p (struct gdbarch *current_gdbarch) | |
2344 | { | |
2345 | return (DEPRECATED_INIT_FRAME_PC_P () | |
2346 | || DEPRECATED_INIT_FRAME_PC_FIRST_P () | |
2347 | || DEPRECATED_INIT_EXTRA_FRAME_INFO_P () | |
618ce49f | 2348 | || DEPRECATED_FRAME_CHAIN_P () |
3e210248 | 2349 | || !gdbarch_unwind_dummy_id_p (current_gdbarch)); |
1594fa56 AC |
2350 | } |
2351 | ||
b9362cc7 AC |
2352 | extern initialize_file_ftype _initialize_frame; /* -Wmissing-prototypes */ |
2353 | ||
25d29d70 AC |
2354 | static struct cmd_list_element *set_backtrace_cmdlist; |
2355 | static struct cmd_list_element *show_backtrace_cmdlist; | |
2356 | ||
2357 | static void | |
2358 | set_backtrace_cmd (char *args, int from_tty) | |
2359 | { | |
2360 | help_list (set_backtrace_cmdlist, "set backtrace ", -1, gdb_stdout); | |
2361 | } | |
2362 | ||
2363 | static void | |
2364 | show_backtrace_cmd (char *args, int from_tty) | |
2365 | { | |
2366 | cmd_show_list (show_backtrace_cmdlist, from_tty, ""); | |
2367 | } | |
2368 | ||
4c1e7e9d AC |
2369 | void |
2370 | _initialize_frame (void) | |
2371 | { | |
2372 | obstack_init (&frame_cache_obstack); | |
eb4f72c5 | 2373 | |
25d29d70 AC |
2374 | add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, "\ |
2375 | Set backtrace specific variables.\n\ | |
2376 | Configure backtrace variables such as the backtrace limit", | |
2377 | &set_backtrace_cmdlist, "set backtrace ", | |
2378 | 0/*allow-unknown*/, &setlist); | |
2379 | add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, "\ | |
2380 | Show backtrace specific variables\n\ | |
2381 | Show backtrace variables such as the backtrace limit", | |
2382 | &show_backtrace_cmdlist, "show backtrace ", | |
2383 | 0/*allow-unknown*/, &showlist); | |
2384 | ||
2385 | add_setshow_boolean_cmd ("past-main", class_obscure, | |
2386 | &backtrace_past_main, "\ | |
eb4f72c5 AC |
2387 | Set whether backtraces should continue past \"main\".\n\ |
2388 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2389 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2390 | of the stack trace.", "\ | |
2391 | Show whether backtraces should continue past \"main\".\n\ | |
2392 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2393 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2394 | of the stack trace.", | |
25d29d70 AC |
2395 | NULL, NULL, &set_backtrace_cmdlist, |
2396 | &show_backtrace_cmdlist); | |
2397 | ||
2398 | add_setshow_uinteger_cmd ("limit", class_obscure, | |
2399 | &backtrace_limit, "\ | |
2400 | Set an upper bound on the number of backtrace levels.\n\ | |
fec74868 | 2401 | No more than the specified number of frames can be displayed or examined.\n\ |
25d29d70 AC |
2402 | Zero is unlimited.", "\ |
2403 | Show the upper bound on the number of backtrace levels.", | |
2404 | NULL, NULL, &set_backtrace_cmdlist, | |
2405 | &show_backtrace_cmdlist); | |
ac2bd0a9 AC |
2406 | |
2407 | /* Debug this files internals. */ | |
2408 | add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger, | |
2409 | &frame_debug, "Set frame debugging.\n\ | |
2410 | When non-zero, frame specific internal debugging is enabled.", &setdebuglist), | |
2411 | &showdebuglist); | |
4c1e7e9d | 2412 | } |