Commit | Line | Data |
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4f460812 | 1 | /* Cache and manage frames for GDB, the GNU debugger. |
96cb11df AC |
2 | |
3 | Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, | |
51603483 | 4 | 2001, 2002, 2003 Free Software Foundation, Inc. |
d65fe839 AC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "target.h" | |
26 | #include "value.h" | |
39f77062 | 27 | #include "inferior.h" /* for inferior_ptid */ |
4e052eda | 28 | #include "regcache.h" |
4f460812 | 29 | #include "gdb_assert.h" |
e36180d7 AC |
30 | #include "gdb_string.h" |
31 | #include "builtin-regs.h" | |
4c1e7e9d AC |
32 | #include "gdb_obstack.h" |
33 | #include "dummy-frame.h" | |
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 | ||
eb4f72c5 AC |
138 | /* Flag to indicate whether backtraces should stop at main. */ |
139 | ||
140 | static int backtrace_below_main; | |
d65fe839 | 141 | |
7f78e237 AC |
142 | static void |
143 | fprint_frame_id (struct ui_file *file, struct frame_id id) | |
144 | { | |
145 | fprintf_unfiltered (file, "{stack=0x%s,code=0x%s}", | |
146 | paddr_nz (id.stack_addr), | |
147 | paddr_nz (id.code_addr)); | |
148 | } | |
149 | ||
150 | static void | |
151 | fprint_frame_type (struct ui_file *file, enum frame_type type) | |
152 | { | |
153 | switch (type) | |
154 | { | |
155 | case UNKNOWN_FRAME: | |
156 | fprintf_unfiltered (file, "UNKNOWN_FRAME"); | |
157 | return; | |
158 | case NORMAL_FRAME: | |
159 | fprintf_unfiltered (file, "NORMAL_FRAME"); | |
160 | return; | |
161 | case DUMMY_FRAME: | |
162 | fprintf_unfiltered (file, "DUMMY_FRAME"); | |
163 | return; | |
164 | case SIGTRAMP_FRAME: | |
165 | fprintf_unfiltered (file, "SIGTRAMP_FRAME"); | |
166 | return; | |
167 | default: | |
168 | fprintf_unfiltered (file, "<unknown type>"); | |
169 | return; | |
170 | }; | |
171 | } | |
172 | ||
173 | static void | |
174 | fprint_frame (struct ui_file *file, struct frame_info *fi) | |
175 | { | |
176 | if (fi == NULL) | |
177 | { | |
178 | fprintf_unfiltered (file, "<NULL frame>"); | |
179 | return; | |
180 | } | |
181 | fprintf_unfiltered (file, "{"); | |
182 | fprintf_unfiltered (file, "level=%d", fi->level); | |
183 | fprintf_unfiltered (file, ","); | |
184 | fprintf_unfiltered (file, "type="); | |
185 | fprint_frame_type (file, fi->type); | |
186 | fprintf_unfiltered (file, ","); | |
187 | fprintf_unfiltered (file, "unwind="); | |
188 | if (fi->unwind != NULL) | |
189 | gdb_print_host_address (fi->unwind, file); | |
190 | else | |
191 | fprintf_unfiltered (file, "<unknown>"); | |
192 | fprintf_unfiltered (file, ","); | |
193 | fprintf_unfiltered (file, "pc="); | |
194 | if (fi->next != NULL && fi->next->prev_pc.p) | |
195 | fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_pc.value)); | |
196 | else | |
197 | fprintf_unfiltered (file, "<unknown>"); | |
198 | fprintf_unfiltered (file, ","); | |
199 | fprintf_unfiltered (file, "id="); | |
200 | if (fi->this_id.p) | |
201 | fprint_frame_id (file, fi->this_id.value); | |
202 | else | |
203 | fprintf_unfiltered (file, "<unknown>"); | |
204 | fprintf_unfiltered (file, ","); | |
205 | fprintf_unfiltered (file, "func="); | |
206 | if (fi->next != NULL && fi->next->prev_func.p) | |
207 | fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_func.addr)); | |
208 | else | |
209 | fprintf_unfiltered (file, "<unknown>"); | |
210 | fprintf_unfiltered (file, "}"); | |
211 | } | |
212 | ||
7a424e99 | 213 | /* Return a frame uniq ID that can be used to, later, re-find the |
101dcfbe AC |
214 | frame. */ |
215 | ||
7a424e99 AC |
216 | struct frame_id |
217 | get_frame_id (struct frame_info *fi) | |
101dcfbe AC |
218 | { |
219 | if (fi == NULL) | |
220 | { | |
7a424e99 | 221 | return null_frame_id; |
101dcfbe | 222 | } |
d0a55772 | 223 | if (!fi->this_id.p) |
101dcfbe | 224 | { |
06c77151 | 225 | gdb_assert (!legacy_frame_p (current_gdbarch)); |
7f78e237 AC |
226 | if (frame_debug) |
227 | fprintf_unfiltered (gdb_stdlog, "{ get_frame_id (fi=%d) ", | |
228 | fi->level); | |
c50901fd AC |
229 | /* Find the unwinder. */ |
230 | if (fi->unwind == NULL) | |
231 | { | |
232 | fi->unwind = frame_unwind_find_by_pc (current_gdbarch, | |
233 | get_frame_pc (fi)); | |
234 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's | |
235 | type in the frame, the unwinder's type should be returned | |
236 | directly. Unfortunatly, legacy code, called by | |
237 | legacy_get_prev_frame, explicitly set the frames type | |
238 | using the method deprecated_set_frame_type(). */ | |
239 | gdb_assert (fi->unwind->type != UNKNOWN_FRAME); | |
240 | fi->type = fi->unwind->type; | |
241 | } | |
06c77151 | 242 | /* Find THIS frame's ID. */ |
d0a55772 AC |
243 | fi->unwind->this_id (fi->next, &fi->prologue_cache, &fi->this_id.value); |
244 | fi->this_id.p = 1; | |
7f78e237 AC |
245 | if (frame_debug) |
246 | { | |
247 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
248 | fprint_frame_id (gdb_stdlog, fi->this_id.value); | |
249 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
250 | } | |
101dcfbe | 251 | } |
18adea3f | 252 | return fi->this_id.value; |
101dcfbe AC |
253 | } |
254 | ||
7a424e99 AC |
255 | const struct frame_id null_frame_id; /* All zeros. */ |
256 | ||
257 | struct frame_id | |
d0a55772 | 258 | frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr) |
7a424e99 AC |
259 | { |
260 | struct frame_id id; | |
d0a55772 AC |
261 | id.stack_addr = stack_addr; |
262 | id.code_addr = code_addr; | |
7a424e99 AC |
263 | return id; |
264 | } | |
265 | ||
266 | int | |
267 | frame_id_p (struct frame_id l) | |
268 | { | |
d0a55772 AC |
269 | int p; |
270 | /* The .code can be NULL but the .stack cannot. */ | |
271 | p = (l.stack_addr != 0); | |
7f78e237 AC |
272 | if (frame_debug) |
273 | { | |
274 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_p (l="); | |
275 | fprint_frame_id (gdb_stdlog, l); | |
276 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", p); | |
277 | } | |
d0a55772 | 278 | return p; |
7a424e99 AC |
279 | } |
280 | ||
281 | int | |
282 | frame_id_eq (struct frame_id l, struct frame_id r) | |
283 | { | |
d0a55772 AC |
284 | int eq; |
285 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
286 | /* Like a NaN, if either ID is invalid, the result is false. */ | |
287 | eq = 0; | |
288 | else if (l.stack_addr != r.stack_addr) | |
289 | /* If .stack addresses are different, the frames are different. */ | |
290 | eq = 0; | |
291 | else if (l.code_addr == 0 || r.code_addr == 0) | |
292 | /* A zero code addr is a wild card, always succeed. */ | |
293 | eq = 1; | |
294 | else if (l.code_addr == r.code_addr) | |
295 | /* The .stack and .code are identical, the ID's are identical. */ | |
296 | eq = 1; | |
297 | else | |
4aa79dcc AC |
298 | /* No luck. */ |
299 | eq = 0; | |
7f78e237 AC |
300 | if (frame_debug) |
301 | { | |
302 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (l="); | |
303 | fprint_frame_id (gdb_stdlog, l); | |
304 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
305 | fprint_frame_id (gdb_stdlog, r); | |
306 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", eq); | |
307 | } | |
d0a55772 | 308 | return eq; |
7a424e99 AC |
309 | } |
310 | ||
311 | int | |
312 | frame_id_inner (struct frame_id l, struct frame_id r) | |
313 | { | |
d0a55772 AC |
314 | int inner; |
315 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
316 | /* Like NaN, any operation involving an invalid ID always fails. */ | |
317 | inner = 0; | |
318 | else | |
319 | /* Only return non-zero when strictly inner than. Note that, per | |
320 | comment in "frame.h", there is some fuzz here. Frameless | |
321 | functions are not strictly inner than (same .stack but | |
322 | different .code). */ | |
323 | inner = INNER_THAN (l.stack_addr, r.stack_addr); | |
7f78e237 AC |
324 | if (frame_debug) |
325 | { | |
326 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_inner (l="); | |
327 | fprint_frame_id (gdb_stdlog, l); | |
328 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
329 | fprint_frame_id (gdb_stdlog, r); | |
330 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", inner); | |
331 | } | |
d0a55772 | 332 | return inner; |
7a424e99 AC |
333 | } |
334 | ||
101dcfbe AC |
335 | struct frame_info * |
336 | frame_find_by_id (struct frame_id id) | |
337 | { | |
338 | struct frame_info *frame; | |
339 | ||
340 | /* ZERO denotes the null frame, let the caller decide what to do | |
341 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 342 | if (!frame_id_p (id)) |
101dcfbe AC |
343 | return NULL; |
344 | ||
345 | for (frame = get_current_frame (); | |
346 | frame != NULL; | |
347 | frame = get_prev_frame (frame)) | |
348 | { | |
7a424e99 AC |
349 | struct frame_id this = get_frame_id (frame); |
350 | if (frame_id_eq (id, this)) | |
351 | /* An exact match. */ | |
352 | return frame; | |
353 | if (frame_id_inner (id, this)) | |
354 | /* Gone to far. */ | |
101dcfbe | 355 | return NULL; |
7a424e99 AC |
356 | /* Either, we're not yet gone far enough out along the frame |
357 | chain (inner(this,id), or we're comparing frameless functions | |
358 | (same .base, different .func, no test available). Struggle | |
359 | on until we've definitly gone to far. */ | |
101dcfbe AC |
360 | } |
361 | return NULL; | |
362 | } | |
363 | ||
f18c5a73 | 364 | CORE_ADDR |
12cc2063 | 365 | frame_pc_unwind (struct frame_info *this_frame) |
f18c5a73 | 366 | { |
d1340264 | 367 | if (!this_frame->prev_pc.p) |
f18c5a73 | 368 | { |
12cc2063 AC |
369 | CORE_ADDR pc; |
370 | if (gdbarch_unwind_pc_p (current_gdbarch)) | |
371 | { | |
372 | /* The right way. The `pure' way. The one true way. This | |
373 | method depends solely on the register-unwind code to | |
374 | determine the value of registers in THIS frame, and hence | |
375 | the value of this frame's PC (resume address). A typical | |
376 | implementation is no more than: | |
377 | ||
378 | frame_unwind_register (this_frame, ISA_PC_REGNUM, buf); | |
379 | return extract_address (buf, size of ISA_PC_REGNUM); | |
380 | ||
381 | Note: this method is very heavily dependent on a correct | |
382 | register-unwind implementation, it pays to fix that | |
383 | method first; this method is frame type agnostic, since | |
384 | it only deals with register values, it works with any | |
385 | frame. This is all in stark contrast to the old | |
386 | FRAME_SAVED_PC which would try to directly handle all the | |
387 | different ways that a PC could be unwound. */ | |
388 | pc = gdbarch_unwind_pc (current_gdbarch, this_frame); | |
389 | } | |
390 | else if (this_frame->level < 0) | |
391 | { | |
392 | /* FIXME: cagney/2003-03-06: Old code and and a sentinel | |
393 | frame. Do like was always done. Fetch the PC's value | |
394 | direct from the global registers array (via read_pc). | |
395 | This assumes that this frame belongs to the current | |
396 | global register cache. The assumption is dangerous. */ | |
397 | pc = read_pc (); | |
398 | } | |
8bedc050 | 399 | else if (DEPRECATED_FRAME_SAVED_PC_P ()) |
12cc2063 AC |
400 | { |
401 | /* FIXME: cagney/2003-03-06: Old code, but not a sentinel | |
402 | frame. Do like was always done. Note that this method, | |
403 | unlike unwind_pc(), tries to handle all the different | |
404 | frame cases directly. It fails. */ | |
8bedc050 | 405 | pc = DEPRECATED_FRAME_SAVED_PC (this_frame); |
12cc2063 AC |
406 | } |
407 | else | |
408 | internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method"); | |
d1340264 AC |
409 | this_frame->prev_pc.value = pc; |
410 | this_frame->prev_pc.p = 1; | |
7f78e237 AC |
411 | if (frame_debug) |
412 | fprintf_unfiltered (gdb_stdlog, | |
413 | "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n", | |
414 | this_frame->level, | |
415 | paddr_nz (this_frame->prev_pc.value)); | |
f18c5a73 | 416 | } |
d1340264 | 417 | return this_frame->prev_pc.value; |
f18c5a73 AC |
418 | } |
419 | ||
be41e9f4 AC |
420 | CORE_ADDR |
421 | frame_func_unwind (struct frame_info *fi) | |
422 | { | |
423 | if (!fi->prev_func.p) | |
424 | { | |
425 | fi->prev_func.p = 1; | |
426 | fi->prev_func.addr = get_pc_function_start (frame_pc_unwind (fi)); | |
7f78e237 AC |
427 | if (frame_debug) |
428 | fprintf_unfiltered (gdb_stdlog, | |
429 | "{ frame_func_unwind (fi=%d) -> 0x%s }\n", | |
430 | fi->level, paddr_nz (fi->prev_func.addr)); | |
be41e9f4 AC |
431 | } |
432 | return fi->prev_func.addr; | |
433 | } | |
434 | ||
435 | CORE_ADDR | |
436 | get_frame_func (struct frame_info *fi) | |
437 | { | |
438 | return frame_func_unwind (fi->next); | |
439 | } | |
440 | ||
7a25a7c1 AC |
441 | static int |
442 | do_frame_unwind_register (void *src, int regnum, void *buf) | |
443 | { | |
444 | frame_unwind_register (src, regnum, buf); | |
445 | return 1; | |
446 | } | |
447 | ||
dbe9fe58 | 448 | void |
7a25a7c1 AC |
449 | frame_pop (struct frame_info *this_frame) |
450 | { | |
451 | struct regcache *scratch_regcache; | |
452 | struct cleanup *cleanups; | |
453 | ||
749b82f6 | 454 | if (DEPRECATED_POP_FRAME_P ()) |
7a25a7c1 AC |
455 | { |
456 | /* A legacy architecture that has implemented a custom pop | |
457 | function. All new architectures should instead be using the | |
458 | generic code below. */ | |
749b82f6 | 459 | DEPRECATED_POP_FRAME; |
7a25a7c1 AC |
460 | } |
461 | else | |
462 | { | |
463 | /* Make a copy of all the register values unwound from this | |
464 | frame. Save them in a scratch buffer so that there isn't a | |
465 | race betweening trying to extract the old values from the | |
466 | current_regcache while, at the same time writing new values | |
467 | into that same cache. */ | |
468 | struct regcache *scratch = regcache_xmalloc (current_gdbarch); | |
469 | struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch); | |
470 | regcache_save (scratch, do_frame_unwind_register, this_frame); | |
efd710d6 AC |
471 | /* FIXME: cagney/2003-03-16: It should be possible to tell the |
472 | target's register cache that it is about to be hit with a | |
473 | burst register transfer and that the sequence of register | |
474 | writes should be batched. The pair target_prepare_to_store() | |
475 | and target_store_registers() kind of suggest this | |
476 | functionality. Unfortunatly, they don't implement it. Their | |
477 | lack of a formal definition can lead to targets writing back | |
478 | bogus values (arguably a bug in the target code mind). */ | |
7a25a7c1 AC |
479 | /* Now copy those saved registers into the current regcache. |
480 | Here, regcache_cpy() calls regcache_restore(). */ | |
481 | regcache_cpy (current_regcache, scratch); | |
482 | do_cleanups (cleanups); | |
483 | } | |
484 | /* We've made right mess of GDB's local state, just discard | |
485 | everything. */ | |
dbe9fe58 AC |
486 | flush_cached_frames (); |
487 | } | |
c689142b | 488 | |
4f460812 AC |
489 | void |
490 | frame_register_unwind (struct frame_info *frame, int regnum, | |
491 | int *optimizedp, enum lval_type *lvalp, | |
492 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
493 | { | |
494 | struct frame_unwind_cache *cache; | |
495 | ||
7f78e237 AC |
496 | if (frame_debug) |
497 | { | |
498 | fprintf_unfiltered (gdb_stdlog, | |
499 | "{ frame_register_unwind (frame=%d,regnum=\"%s\",...) ", | |
500 | frame->level, frame_map_regnum_to_name (regnum)); | |
501 | } | |
502 | ||
4f460812 AC |
503 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates |
504 | that the value proper does not need to be fetched. */ | |
505 | gdb_assert (optimizedp != NULL); | |
506 | gdb_assert (lvalp != NULL); | |
507 | gdb_assert (addrp != NULL); | |
508 | gdb_assert (realnump != NULL); | |
509 | /* gdb_assert (bufferp != NULL); */ | |
510 | ||
a94dd1fd AC |
511 | /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame |
512 | is broken. There is always a frame. If there, for some reason, | |
513 | isn't, there is some pretty busted code as it should have | |
514 | detected the problem before calling here. */ | |
515 | gdb_assert (frame != NULL); | |
4f460812 | 516 | |
c50901fd AC |
517 | /* Find the unwinder. */ |
518 | if (frame->unwind == NULL) | |
519 | { | |
520 | frame->unwind = frame_unwind_find_by_pc (current_gdbarch, | |
521 | get_frame_pc (frame)); | |
522 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's | |
523 | type in the frame, the unwinder's type should be returned | |
524 | directly. Unfortunatly, legacy code, called by | |
525 | legacy_get_prev_frame, explicitly set the frames type using | |
526 | the method deprecated_set_frame_type(). */ | |
527 | gdb_assert (frame->unwind->type != UNKNOWN_FRAME); | |
528 | frame->type = frame->unwind->type; | |
529 | } | |
530 | ||
6dc42492 AC |
531 | /* Ask this frame to unwind its register. See comment in |
532 | "frame-unwind.h" for why NEXT frame and this unwind cace are | |
533 | passed in. */ | |
534 | frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum, | |
535 | optimizedp, lvalp, addrp, realnump, bufferp); | |
536 | ||
7f78e237 AC |
537 | if (frame_debug) |
538 | { | |
539 | fprintf_unfiltered (gdb_stdlog, "->"); | |
540 | fprintf_unfiltered (gdb_stdlog, " *optimizedp=%d", (*optimizedp)); | |
541 | fprintf_unfiltered (gdb_stdlog, " *lvalp=%d", (int) (*lvalp)); | |
542 | fprintf_unfiltered (gdb_stdlog, " *addrp=0x%s", paddr_nz ((*addrp))); | |
543 | fprintf_unfiltered (gdb_stdlog, " *bufferp="); | |
544 | if (bufferp == NULL) | |
545 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
546 | else | |
547 | { | |
548 | int i; | |
549 | const char *buf = bufferp; | |
550 | fprintf_unfiltered (gdb_stdlog, "["); | |
551 | for (i = 0; i < register_size (current_gdbarch, regnum); i++) | |
552 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); | |
553 | fprintf_unfiltered (gdb_stdlog, "]"); | |
554 | } | |
555 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
556 | } | |
4f460812 AC |
557 | } |
558 | ||
a216a322 AC |
559 | void |
560 | frame_register (struct frame_info *frame, int regnum, | |
561 | int *optimizedp, enum lval_type *lvalp, | |
562 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
563 | { | |
564 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates | |
565 | that the value proper does not need to be fetched. */ | |
566 | gdb_assert (optimizedp != NULL); | |
567 | gdb_assert (lvalp != NULL); | |
568 | gdb_assert (addrp != NULL); | |
569 | gdb_assert (realnump != NULL); | |
570 | /* gdb_assert (bufferp != NULL); */ | |
571 | ||
572 | /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset | |
573 | of the register in the register cache. It should instead return | |
574 | the REGNUM corresponding to that register. Translate the . */ | |
129c1cd6 | 575 | if (DEPRECATED_GET_SAVED_REGISTER_P ()) |
a216a322 | 576 | { |
129c1cd6 AC |
577 | DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame, |
578 | regnum, lvalp); | |
a216a322 AC |
579 | /* Compute the REALNUM if the caller wants it. */ |
580 | if (*lvalp == lval_register) | |
581 | { | |
582 | int regnum; | |
583 | for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++) | |
584 | { | |
585 | if (*addrp == register_offset_hack (current_gdbarch, regnum)) | |
586 | { | |
587 | *realnump = regnum; | |
588 | return; | |
589 | } | |
590 | } | |
591 | internal_error (__FILE__, __LINE__, | |
592 | "Failed to compute the register number corresponding" | |
593 | " to 0x%s", paddr_d (*addrp)); | |
594 | } | |
595 | *realnump = -1; | |
596 | return; | |
597 | } | |
598 | ||
a94dd1fd AC |
599 | /* Obtain the register value by unwinding the register from the next |
600 | (more inner frame). */ | |
601 | gdb_assert (frame != NULL && frame->next != NULL); | |
602 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
603 | realnump, bufferp); | |
a216a322 AC |
604 | } |
605 | ||
135c175f | 606 | void |
5b181d62 | 607 | frame_unwind_register (struct frame_info *frame, int regnum, void *buf) |
135c175f AC |
608 | { |
609 | int optimized; | |
610 | CORE_ADDR addr; | |
611 | int realnum; | |
612 | enum lval_type lval; | |
135c175f AC |
613 | frame_register_unwind (frame, regnum, &optimized, &lval, &addr, |
614 | &realnum, buf); | |
5b181d62 AC |
615 | } |
616 | ||
617 | void | |
618 | frame_unwind_signed_register (struct frame_info *frame, int regnum, | |
619 | LONGEST *val) | |
620 | { | |
621 | void *buf = alloca (MAX_REGISTER_RAW_SIZE); | |
622 | frame_unwind_register (frame, regnum, buf); | |
135c175f AC |
623 | (*val) = extract_signed_integer (buf, REGISTER_VIRTUAL_SIZE (regnum)); |
624 | } | |
625 | ||
626 | void | |
627 | frame_unwind_unsigned_register (struct frame_info *frame, int regnum, | |
628 | ULONGEST *val) | |
629 | { | |
135c175f | 630 | void *buf = alloca (MAX_REGISTER_RAW_SIZE); |
5b181d62 | 631 | frame_unwind_register (frame, regnum, buf); |
135c175f AC |
632 | (*val) = extract_unsigned_integer (buf, REGISTER_VIRTUAL_SIZE (regnum)); |
633 | } | |
4f460812 | 634 | |
5b181d62 AC |
635 | void |
636 | frame_read_register (struct frame_info *frame, int regnum, void *buf) | |
637 | { | |
638 | gdb_assert (frame != NULL && frame->next != NULL); | |
639 | frame_unwind_register (frame->next, regnum, buf); | |
640 | } | |
641 | ||
f908a0eb AC |
642 | void |
643 | frame_read_unsigned_register (struct frame_info *frame, int regnum, | |
644 | ULONGEST *val) | |
645 | { | |
646 | /* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is | |
647 | always a frame. Both this, and the equivalent | |
648 | frame_read_signed_register() function, can only be called with a | |
649 | valid frame. If, for some reason, this function is called | |
650 | without a frame then the problem isn't here, but rather in the | |
651 | caller. It should of first created a frame and then passed that | |
652 | in. */ | |
653 | /* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the | |
654 | ``current_frame'' should not be treated as a special case. While | |
655 | ``get_next_frame (current_frame) == NULL'' currently holds, it | |
656 | should, as far as possible, not be relied upon. In the future, | |
657 | ``get_next_frame (current_frame)'' may instead simply return a | |
658 | normal frame object that simply always gets register values from | |
659 | the register cache. Consequently, frame code should try to avoid | |
660 | tests like ``if get_next_frame() == NULL'' and instead just rely | |
661 | on recursive frame calls (like the below code) when manipulating | |
662 | a frame chain. */ | |
a94dd1fd AC |
663 | gdb_assert (frame != NULL && frame->next != NULL); |
664 | frame_unwind_unsigned_register (frame->next, regnum, val); | |
f908a0eb AC |
665 | } |
666 | ||
667 | void | |
668 | frame_read_signed_register (struct frame_info *frame, int regnum, | |
669 | LONGEST *val) | |
670 | { | |
a94dd1fd AC |
671 | /* See note above in frame_read_unsigned_register(). */ |
672 | gdb_assert (frame != NULL && frame->next != NULL); | |
673 | frame_unwind_signed_register (frame->next, regnum, val); | |
f908a0eb AC |
674 | } |
675 | ||
f796e4be | 676 | void |
4f460812 AC |
677 | generic_unwind_get_saved_register (char *raw_buffer, |
678 | int *optimizedp, | |
679 | CORE_ADDR *addrp, | |
680 | struct frame_info *frame, | |
681 | int regnum, | |
682 | enum lval_type *lvalp) | |
683 | { | |
684 | int optimizedx; | |
685 | CORE_ADDR addrx; | |
686 | int realnumx; | |
687 | enum lval_type lvalx; | |
688 | ||
689 | if (!target_has_registers) | |
690 | error ("No registers."); | |
691 | ||
692 | /* Keep things simple, ensure that all the pointers (except valuep) | |
693 | are non NULL. */ | |
694 | if (optimizedp == NULL) | |
695 | optimizedp = &optimizedx; | |
696 | if (lvalp == NULL) | |
697 | lvalp = &lvalx; | |
698 | if (addrp == NULL) | |
699 | addrp = &addrx; | |
700 | ||
a94dd1fd AC |
701 | gdb_assert (frame != NULL && frame->next != NULL); |
702 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
703 | &realnumx, raw_buffer); | |
4f460812 AC |
704 | } |
705 | ||
cda5a58a | 706 | /* frame_register_read () |
d65fe839 | 707 | |
cda5a58a | 708 | Find and return the value of REGNUM for the specified stack frame. |
d65fe839 AC |
709 | The number of bytes copied is REGISTER_RAW_SIZE (REGNUM). |
710 | ||
cda5a58a | 711 | Returns 0 if the register value could not be found. */ |
d65fe839 | 712 | |
cda5a58a AC |
713 | int |
714 | frame_register_read (struct frame_info *frame, int regnum, void *myaddr) | |
d65fe839 | 715 | { |
a216a322 AC |
716 | int optimized; |
717 | enum lval_type lval; | |
718 | CORE_ADDR addr; | |
719 | int realnum; | |
720 | frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr); | |
d65fe839 | 721 | |
c97dcfc7 AC |
722 | /* FIXME: cagney/2002-05-15: This test, is just bogus. |
723 | ||
724 | It indicates that the target failed to supply a value for a | |
725 | register because it was "not available" at this time. Problem | |
726 | is, the target still has the register and so get saved_register() | |
727 | may be returning a value saved on the stack. */ | |
728 | ||
d65fe839 | 729 | if (register_cached (regnum) < 0) |
cda5a58a | 730 | return 0; /* register value not available */ |
d65fe839 | 731 | |
a216a322 | 732 | return !optimized; |
d65fe839 | 733 | } |
e36180d7 AC |
734 | |
735 | ||
736 | /* Map between a frame register number and its name. A frame register | |
737 | space is a superset of the cooked register space --- it also | |
738 | includes builtin registers. */ | |
739 | ||
740 | int | |
741 | frame_map_name_to_regnum (const char *name, int len) | |
742 | { | |
743 | int i; | |
744 | ||
5f601589 AC |
745 | if (len < 0) |
746 | len = strlen (name); | |
747 | ||
e36180d7 AC |
748 | /* Search register name space. */ |
749 | for (i = 0; i < NUM_REGS + NUM_PSEUDO_REGS; i++) | |
750 | if (REGISTER_NAME (i) && len == strlen (REGISTER_NAME (i)) | |
751 | && strncmp (name, REGISTER_NAME (i), len) == 0) | |
752 | { | |
753 | return i; | |
754 | } | |
755 | ||
756 | /* Try builtin registers. */ | |
757 | i = builtin_reg_map_name_to_regnum (name, len); | |
758 | if (i >= 0) | |
759 | { | |
760 | /* A builtin register doesn't fall into the architecture's | |
761 | register range. */ | |
762 | gdb_assert (i >= NUM_REGS + NUM_PSEUDO_REGS); | |
763 | return i; | |
764 | } | |
765 | ||
766 | return -1; | |
767 | } | |
768 | ||
769 | const char * | |
770 | frame_map_regnum_to_name (int regnum) | |
771 | { | |
772 | if (regnum < 0) | |
773 | return NULL; | |
774 | if (regnum < NUM_REGS + NUM_PSEUDO_REGS) | |
775 | return REGISTER_NAME (regnum); | |
776 | return builtin_reg_map_regnum_to_name (regnum); | |
777 | } | |
4c1e7e9d | 778 | |
a94dd1fd AC |
779 | /* Create a sentinel frame. */ |
780 | ||
781 | struct frame_info * | |
782 | create_sentinel_frame (struct regcache *regcache) | |
783 | { | |
784 | struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
785 | frame->type = NORMAL_FRAME; | |
786 | frame->level = -1; | |
787 | /* Explicitly initialize the sentinel frame's cache. Provide it | |
788 | with the underlying regcache. In the future additional | |
789 | information, such as the frame's thread will be added. */ | |
6dc42492 | 790 | frame->prologue_cache = sentinel_frame_cache (regcache); |
a94dd1fd AC |
791 | /* For the moment there is only one sentinel frame implementation. */ |
792 | frame->unwind = sentinel_frame_unwind; | |
793 | /* Link this frame back to itself. The frame is self referential | |
794 | (the unwound PC is the same as the pc), so make it so. */ | |
795 | frame->next = frame; | |
50bbdbd9 AC |
796 | /* Make the sentinel frame's ID valid, but invalid. That way all |
797 | comparisons with it should fail. */ | |
d0a55772 AC |
798 | frame->this_id.p = 1; |
799 | frame->this_id.value = null_frame_id; | |
7f78e237 AC |
800 | if (frame_debug) |
801 | { | |
802 | fprintf_unfiltered (gdb_stdlog, "{ create_sentinel_frame (...) -> "); | |
803 | fprint_frame (gdb_stdlog, frame); | |
804 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
805 | } | |
a94dd1fd AC |
806 | return frame; |
807 | } | |
808 | ||
4c1e7e9d AC |
809 | /* Info about the innermost stack frame (contents of FP register) */ |
810 | ||
811 | static struct frame_info *current_frame; | |
812 | ||
813 | /* Cache for frame addresses already read by gdb. Valid only while | |
814 | inferior is stopped. Control variables for the frame cache should | |
815 | be local to this module. */ | |
816 | ||
817 | static struct obstack frame_cache_obstack; | |
818 | ||
819 | void * | |
479ab5a0 | 820 | frame_obstack_zalloc (unsigned long size) |
4c1e7e9d | 821 | { |
479ab5a0 AC |
822 | void *data = obstack_alloc (&frame_cache_obstack, size); |
823 | memset (data, 0, size); | |
824 | return data; | |
4c1e7e9d AC |
825 | } |
826 | ||
6baff1d2 | 827 | CORE_ADDR * |
4c1e7e9d AC |
828 | frame_saved_regs_zalloc (struct frame_info *fi) |
829 | { | |
830 | fi->saved_regs = (CORE_ADDR *) | |
479ab5a0 | 831 | frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); |
6baff1d2 | 832 | return fi->saved_regs; |
4c1e7e9d AC |
833 | } |
834 | ||
6baff1d2 AC |
835 | CORE_ADDR * |
836 | get_frame_saved_regs (struct frame_info *fi) | |
837 | { | |
838 | return fi->saved_regs; | |
839 | } | |
4c1e7e9d | 840 | |
a94dd1fd AC |
841 | /* Return the innermost (currently executing) stack frame. This is |
842 | split into two functions. The function unwind_to_current_frame() | |
843 | is wrapped in catch exceptions so that, even when the unwind of the | |
844 | sentinel frame fails, the function still returns a stack frame. */ | |
845 | ||
846 | static int | |
847 | unwind_to_current_frame (struct ui_out *ui_out, void *args) | |
848 | { | |
849 | struct frame_info *frame = get_prev_frame (args); | |
850 | /* A sentinel frame can fail to unwind, eg, because it's PC value | |
851 | lands in somewhere like start. */ | |
852 | if (frame == NULL) | |
853 | return 1; | |
854 | current_frame = frame; | |
855 | return 0; | |
856 | } | |
4c1e7e9d AC |
857 | |
858 | struct frame_info * | |
859 | get_current_frame (void) | |
860 | { | |
0a1e1ca1 AC |
861 | /* First check, and report, the lack of registers. Having GDB |
862 | report "No stack!" or "No memory" when the target doesn't even | |
863 | have registers is very confusing. Besides, "printcmd.exp" | |
864 | explicitly checks that ``print $pc'' with no registers prints "No | |
865 | registers". */ | |
a94dd1fd AC |
866 | if (!target_has_registers) |
867 | error ("No registers."); | |
0a1e1ca1 AC |
868 | if (!target_has_stack) |
869 | error ("No stack."); | |
a94dd1fd AC |
870 | if (!target_has_memory) |
871 | error ("No memory."); | |
4c1e7e9d AC |
872 | if (current_frame == NULL) |
873 | { | |
a94dd1fd AC |
874 | struct frame_info *sentinel_frame = |
875 | create_sentinel_frame (current_regcache); | |
876 | if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame, | |
877 | NULL, RETURN_MASK_ERROR) != 0) | |
878 | { | |
879 | /* Oops! Fake a current frame? Is this useful? It has a PC | |
880 | of zero, for instance. */ | |
881 | current_frame = sentinel_frame; | |
882 | } | |
4c1e7e9d AC |
883 | } |
884 | return current_frame; | |
885 | } | |
886 | ||
6e7f8b9c AC |
887 | /* The "selected" stack frame is used by default for local and arg |
888 | access. May be zero, for no selected frame. */ | |
889 | ||
890 | struct frame_info *deprecated_selected_frame; | |
891 | ||
892 | /* Return the selected frame. Always non-null (unless there isn't an | |
893 | inferior sufficient for creating a frame) in which case an error is | |
894 | thrown. */ | |
895 | ||
896 | struct frame_info * | |
897 | get_selected_frame (void) | |
898 | { | |
899 | if (deprecated_selected_frame == NULL) | |
900 | /* Hey! Don't trust this. It should really be re-finding the | |
901 | last selected frame of the currently selected thread. This, | |
902 | though, is better than nothing. */ | |
903 | select_frame (get_current_frame ()); | |
904 | /* There is always a frame. */ | |
905 | gdb_assert (deprecated_selected_frame != NULL); | |
906 | return deprecated_selected_frame; | |
907 | } | |
908 | ||
909 | /* Select frame FI (or NULL - to invalidate the current frame). */ | |
910 | ||
911 | void | |
912 | select_frame (struct frame_info *fi) | |
913 | { | |
914 | register struct symtab *s; | |
915 | ||
916 | deprecated_selected_frame = fi; | |
917 | /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the | |
918 | frame is being invalidated. */ | |
919 | if (selected_frame_level_changed_hook) | |
920 | selected_frame_level_changed_hook (frame_relative_level (fi)); | |
921 | ||
922 | /* FIXME: kseitz/2002-08-28: It would be nice to call | |
923 | selected_frame_level_changed_event right here, but due to limitations | |
924 | in the current interfaces, we would end up flooding UIs with events | |
925 | because select_frame is used extensively internally. | |
926 | ||
927 | Once we have frame-parameterized frame (and frame-related) commands, | |
928 | the event notification can be moved here, since this function will only | |
929 | be called when the users selected frame is being changed. */ | |
930 | ||
931 | /* Ensure that symbols for this frame are read in. Also, determine the | |
932 | source language of this frame, and switch to it if desired. */ | |
933 | if (fi) | |
934 | { | |
11889732 | 935 | s = find_pc_symtab (get_frame_pc (fi)); |
6e7f8b9c AC |
936 | if (s |
937 | && s->language != current_language->la_language | |
938 | && s->language != language_unknown | |
939 | && language_mode == language_mode_auto) | |
940 | { | |
941 | set_language (s->language); | |
942 | } | |
943 | } | |
944 | } | |
945 | ||
4c1e7e9d AC |
946 | /* Return the register saved in the simplistic ``saved_regs'' cache. |
947 | If the value isn't here AND a value is needed, try the next inner | |
948 | most frame. */ | |
949 | ||
950 | static void | |
6dc42492 AC |
951 | legacy_saved_regs_prev_register (struct frame_info *next_frame, |
952 | void **this_prologue_cache, | |
953 | int regnum, int *optimizedp, | |
954 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
955 | int *realnump, void *bufferp) | |
4c1e7e9d | 956 | { |
6dc42492 AC |
957 | /* HACK: New code is passed the next frame and this cache. |
958 | Unfortunatly, old code expects this frame. Since this is a | |
959 | backward compatibility hack, cheat by walking one level along the | |
960 | prologue chain to the frame the old code expects. | |
961 | ||
962 | Do not try this at home. Professional driver, closed course. */ | |
963 | struct frame_info *frame = next_frame->prev; | |
4c1e7e9d | 964 | gdb_assert (frame != NULL); |
4c1e7e9d | 965 | |
8f871025 | 966 | /* Only (older) architectures that implement the |
f30ee0bc AC |
967 | DEPRECATED_FRAME_INIT_SAVED_REGS method should be using this |
968 | function. */ | |
969 | gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()); | |
8f871025 | 970 | |
4c1e7e9d | 971 | /* Load the saved_regs register cache. */ |
a94dd1fd | 972 | if (get_frame_saved_regs (frame) == NULL) |
f30ee0bc | 973 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); |
4c1e7e9d | 974 | |
a94dd1fd AC |
975 | if (get_frame_saved_regs (frame) != NULL |
976 | && get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d AC |
977 | { |
978 | if (regnum == SP_REGNUM) | |
979 | { | |
980 | /* SP register treated specially. */ | |
981 | *optimizedp = 0; | |
982 | *lvalp = not_lval; | |
983 | *addrp = 0; | |
984 | *realnump = -1; | |
985 | if (bufferp != NULL) | |
986 | store_address (bufferp, REGISTER_RAW_SIZE (regnum), | |
a94dd1fd | 987 | get_frame_saved_regs (frame)[regnum]); |
4c1e7e9d AC |
988 | } |
989 | else | |
990 | { | |
991 | /* Any other register is saved in memory, fetch it but cache | |
992 | a local copy of its value. */ | |
993 | *optimizedp = 0; | |
994 | *lvalp = lval_memory; | |
a94dd1fd | 995 | *addrp = get_frame_saved_regs (frame)[regnum]; |
4c1e7e9d AC |
996 | *realnump = -1; |
997 | if (bufferp != NULL) | |
998 | { | |
999 | #if 1 | |
1000 | /* Save each register value, as it is read in, in a | |
1001 | frame based cache. */ | |
6dc42492 | 1002 | void **regs = (*this_prologue_cache); |
4c1e7e9d AC |
1003 | if (regs == NULL) |
1004 | { | |
1005 | int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS) | |
1006 | * sizeof (void *)); | |
479ab5a0 | 1007 | regs = frame_obstack_zalloc (sizeof_cache); |
6dc42492 | 1008 | (*this_prologue_cache) = regs; |
4c1e7e9d AC |
1009 | } |
1010 | if (regs[regnum] == NULL) | |
1011 | { | |
1012 | regs[regnum] | |
479ab5a0 | 1013 | = frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum)); |
a94dd1fd | 1014 | read_memory (get_frame_saved_regs (frame)[regnum], regs[regnum], |
4c1e7e9d AC |
1015 | REGISTER_RAW_SIZE (regnum)); |
1016 | } | |
1017 | memcpy (bufferp, regs[regnum], REGISTER_RAW_SIZE (regnum)); | |
1018 | #else | |
1019 | /* Read the value in from memory. */ | |
a94dd1fd | 1020 | read_memory (get_frame_saved_regs (frame)[regnum], bufferp, |
4c1e7e9d AC |
1021 | REGISTER_RAW_SIZE (regnum)); |
1022 | #endif | |
1023 | } | |
1024 | } | |
1025 | return; | |
1026 | } | |
1027 | ||
6dc42492 AC |
1028 | /* No luck. Assume this and the next frame have the same register |
1029 | value. Pass the unwind request down the frame chain to the next | |
1030 | frame. Hopefully that frame will find the register's location. */ | |
1031 | frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp, | |
1032 | realnump, bufferp); | |
4c1e7e9d AC |
1033 | } |
1034 | ||
c170fb60 | 1035 | static void |
6dc42492 AC |
1036 | legacy_saved_regs_this_id (struct frame_info *next_frame, |
1037 | void **this_prologue_cache, | |
1038 | struct frame_id *id) | |
c689142b | 1039 | { |
18adea3f AC |
1040 | /* legacy_get_prev_frame() always sets ->this_id.p, hence this is |
1041 | never needed. */ | |
1042 | internal_error (__FILE__, __LINE__, "legacy_saved_regs_this_id() called"); | |
c689142b AC |
1043 | } |
1044 | ||
6dc42492 | 1045 | const struct frame_unwind legacy_saved_regs_unwinder = { |
7df05f2b AC |
1046 | /* Not really. It gets overridden by legacy_get_prev_frame. */ |
1047 | UNKNOWN_FRAME, | |
6dc42492 AC |
1048 | legacy_saved_regs_this_id, |
1049 | legacy_saved_regs_prev_register | |
494cca16 | 1050 | }; |
6dc42492 | 1051 | const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder; |
494cca16 AC |
1052 | |
1053 | ||
ac2adee5 | 1054 | /* Function: deprecated_generic_get_saved_register |
4c1e7e9d | 1055 | Find register number REGNUM relative to FRAME and put its (raw, |
ac2adee5 | 1056 | target format) contents in *RAW_BUFFER. |
4c1e7e9d AC |
1057 | |
1058 | Set *OPTIMIZED if the variable was optimized out (and thus can't be | |
1059 | fetched). Note that this is never set to anything other than zero | |
1060 | in this implementation. | |
1061 | ||
1062 | Set *LVAL to lval_memory, lval_register, or not_lval, depending on | |
1063 | whether the value was fetched from memory, from a register, or in a | |
1064 | strange and non-modifiable way (e.g. a frame pointer which was | |
1065 | calculated rather than fetched). We will use not_lval for values | |
1066 | fetched from generic dummy frames. | |
1067 | ||
1068 | Set *ADDRP to the address, either in memory or as a REGISTER_BYTE | |
1069 | offset into the registers array. If the value is stored in a dummy | |
1070 | frame, set *ADDRP to zero. | |
1071 | ||
4c1e7e9d AC |
1072 | The argument RAW_BUFFER must point to aligned memory. */ |
1073 | ||
1074 | void | |
1075 | deprecated_generic_get_saved_register (char *raw_buffer, int *optimized, | |
1076 | CORE_ADDR *addrp, | |
1077 | struct frame_info *frame, int regnum, | |
1078 | enum lval_type *lval) | |
1079 | { | |
1080 | if (!target_has_registers) | |
1081 | error ("No registers."); | |
1082 | ||
f30ee0bc | 1083 | gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()); |
8f871025 | 1084 | |
4c1e7e9d AC |
1085 | /* Normal systems don't optimize out things with register numbers. */ |
1086 | if (optimized != NULL) | |
1087 | *optimized = 0; | |
1088 | ||
1089 | if (addrp) /* default assumption: not found in memory */ | |
1090 | *addrp = 0; | |
1091 | ||
1092 | /* Note: since the current frame's registers could only have been | |
1093 | saved by frames INTERIOR TO the current frame, we skip examining | |
1094 | the current frame itself: otherwise, we would be getting the | |
1095 | previous frame's registers which were saved by the current frame. */ | |
1096 | ||
a94dd1fd | 1097 | if (frame != NULL) |
4c1e7e9d | 1098 | { |
a94dd1fd AC |
1099 | for (frame = get_next_frame (frame); |
1100 | frame_relative_level (frame) >= 0; | |
1101 | frame = get_next_frame (frame)) | |
4c1e7e9d | 1102 | { |
a94dd1fd | 1103 | if (get_frame_type (frame) == DUMMY_FRAME) |
4c1e7e9d | 1104 | { |
a94dd1fd AC |
1105 | if (lval) /* found it in a CALL_DUMMY frame */ |
1106 | *lval = not_lval; | |
1107 | if (raw_buffer) | |
1108 | /* FIXME: cagney/2002-06-26: This should be via the | |
1109 | gdbarch_register_read() method so that it, on the | |
1110 | fly, constructs either a raw or pseudo register | |
1111 | from the raw register cache. */ | |
1112 | regcache_raw_read | |
1113 | (generic_find_dummy_frame (get_frame_pc (frame), | |
1114 | get_frame_base (frame)), | |
1115 | regnum, raw_buffer); | |
1116 | return; | |
4c1e7e9d | 1117 | } |
a94dd1fd | 1118 | |
f30ee0bc | 1119 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); |
a94dd1fd AC |
1120 | if (get_frame_saved_regs (frame) != NULL |
1121 | && get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d | 1122 | { |
a94dd1fd AC |
1123 | if (lval) /* found it saved on the stack */ |
1124 | *lval = lval_memory; | |
1125 | if (regnum == SP_REGNUM) | |
1126 | { | |
1127 | if (raw_buffer) /* SP register treated specially */ | |
1128 | store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), | |
1129 | get_frame_saved_regs (frame)[regnum]); | |
1130 | } | |
1131 | else | |
1132 | { | |
1133 | if (addrp) /* any other register */ | |
1134 | *addrp = get_frame_saved_regs (frame)[regnum]; | |
1135 | if (raw_buffer) | |
1136 | read_memory (get_frame_saved_regs (frame)[regnum], raw_buffer, | |
1137 | REGISTER_RAW_SIZE (regnum)); | |
1138 | } | |
1139 | return; | |
4c1e7e9d | 1140 | } |
4c1e7e9d AC |
1141 | } |
1142 | } | |
1143 | ||
1144 | /* If we get thru the loop to this point, it means the register was | |
1145 | not saved in any frame. Return the actual live-register value. */ | |
1146 | ||
1147 | if (lval) /* found it in a live register */ | |
1148 | *lval = lval_register; | |
1149 | if (addrp) | |
1150 | *addrp = REGISTER_BYTE (regnum); | |
1151 | if (raw_buffer) | |
1152 | deprecated_read_register_gen (regnum, raw_buffer); | |
1153 | } | |
1154 | ||
eb4f72c5 AC |
1155 | /* Determine the frame's type based on its PC. */ |
1156 | ||
1157 | static enum frame_type | |
1158 | frame_type_from_pc (CORE_ADDR pc) | |
1159 | { | |
1160 | /* FIXME: cagney/2002-11-24: Can't yet directly call | |
1161 | pc_in_dummy_frame() as some architectures don't set | |
1162 | PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the | |
1163 | latter is implemented by simply calling pc_in_dummy_frame). */ | |
1164 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES | |
1165 | && DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) | |
1166 | return DUMMY_FRAME; | |
1167 | else | |
1168 | { | |
1169 | char *name; | |
1170 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1171 | if (PC_IN_SIGTRAMP (pc, name)) | |
1172 | return SIGTRAMP_FRAME; | |
1173 | else | |
1174 | return NORMAL_FRAME; | |
1175 | } | |
1176 | } | |
1177 | ||
4c1e7e9d AC |
1178 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. |
1179 | Always returns a non-NULL value. */ | |
1180 | ||
1181 | struct frame_info * | |
1182 | create_new_frame (CORE_ADDR addr, CORE_ADDR pc) | |
1183 | { | |
1184 | struct frame_info *fi; | |
4c1e7e9d | 1185 | |
7f78e237 AC |
1186 | if (frame_debug) |
1187 | { | |
1188 | fprintf_unfiltered (gdb_stdlog, | |
1189 | "{ create_new_frame (addr=0x%s, pc=0x%s) ", | |
1190 | paddr_nz (addr), paddr_nz (pc)); | |
1191 | } | |
1192 | ||
479ab5a0 | 1193 | fi = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d | 1194 | |
a94dd1fd | 1195 | fi->next = create_sentinel_frame (current_regcache); |
7df05f2b AC |
1196 | |
1197 | /* Select/initialize both the unwind function and the frame's type | |
1198 | based on the PC. */ | |
d1340264 | 1199 | fi->unwind = frame_unwind_find_by_pc (current_gdbarch, pc); |
7df05f2b AC |
1200 | if (fi->unwind->type != UNKNOWN_FRAME) |
1201 | fi->type = fi->unwind->type; | |
1202 | else | |
1203 | fi->type = frame_type_from_pc (pc); | |
1204 | ||
18adea3f | 1205 | fi->this_id.p = 1; |
11889732 AC |
1206 | deprecated_update_frame_base_hack (fi, addr); |
1207 | deprecated_update_frame_pc_hack (fi, pc); | |
4c1e7e9d | 1208 | |
e9582e71 AC |
1209 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1210 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi); | |
4c1e7e9d | 1211 | |
7f78e237 AC |
1212 | if (frame_debug) |
1213 | { | |
1214 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1215 | fprint_frame (gdb_stdlog, fi); | |
1216 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1217 | } | |
1218 | ||
4c1e7e9d AC |
1219 | return fi; |
1220 | } | |
1221 | ||
03febf99 AC |
1222 | /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the |
1223 | innermost frame). Be careful to not fall off the bottom of the | |
1224 | frame chain and onto the sentinel frame. */ | |
4c1e7e9d AC |
1225 | |
1226 | struct frame_info * | |
03febf99 | 1227 | get_next_frame (struct frame_info *this_frame) |
4c1e7e9d | 1228 | { |
03febf99 AC |
1229 | if (this_frame->level > 0) |
1230 | return this_frame->next; | |
a94dd1fd AC |
1231 | else |
1232 | return NULL; | |
4c1e7e9d AC |
1233 | } |
1234 | ||
1235 | /* Flush the entire frame cache. */ | |
1236 | ||
1237 | void | |
1238 | flush_cached_frames (void) | |
1239 | { | |
1240 | /* Since we can't really be sure what the first object allocated was */ | |
1241 | obstack_free (&frame_cache_obstack, 0); | |
1242 | obstack_init (&frame_cache_obstack); | |
1243 | ||
1244 | current_frame = NULL; /* Invalidate cache */ | |
1245 | select_frame (NULL); | |
1246 | annotate_frames_invalid (); | |
7f78e237 AC |
1247 | if (frame_debug) |
1248 | fprintf_unfiltered (gdb_stdlog, "{ flush_cached_frames () }\n"); | |
4c1e7e9d AC |
1249 | } |
1250 | ||
1251 | /* Flush the frame cache, and start a new one if necessary. */ | |
1252 | ||
1253 | void | |
1254 | reinit_frame_cache (void) | |
1255 | { | |
1256 | flush_cached_frames (); | |
1257 | ||
1258 | /* FIXME: The inferior_ptid test is wrong if there is a corefile. */ | |
1259 | if (PIDGET (inferior_ptid) != 0) | |
1260 | { | |
1261 | select_frame (get_current_frame ()); | |
1262 | } | |
1263 | } | |
1264 | ||
eb4f72c5 AC |
1265 | /* Create the previous frame using the deprecated methods |
1266 | INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */ | |
4c1e7e9d | 1267 | |
eb4f72c5 | 1268 | static struct frame_info * |
03febf99 | 1269 | legacy_get_prev_frame (struct frame_info *this_frame) |
4c1e7e9d AC |
1270 | { |
1271 | CORE_ADDR address = 0; | |
1272 | struct frame_info *prev; | |
95adb866 | 1273 | int fromleaf; |
4c1e7e9d | 1274 | |
7f78e237 AC |
1275 | /* Don't frame_debug print legacy_get_prev_frame() here, just |
1276 | confuses the output. */ | |
1277 | ||
a01dd7cc | 1278 | /* Allocate the new frame. |
055bb976 AC |
1279 | |
1280 | There is no reason to worry about memory leaks, should the | |
1281 | remainder of the function fail. The allocated memory will be | |
1282 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1283 | been here before' check, in get_prev_frame will stop repeated | |
1284 | memory allocation calls. */ | |
1285 | prev = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
1286 | prev->level = this_frame->level + 1; | |
1287 | ||
a01dd7cc AC |
1288 | /* Do not completly wire it in to the frame chain. Some (bad) code |
1289 | in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull | |
1290 | some fancy tricks (of course such code is, by definition, | |
1291 | recursive). | |
1292 | ||
1293 | On the other hand, methods, such as get_frame_pc() and | |
1294 | get_frame_base() rely on being able to walk along the frame | |
1295 | chain. Make certain that at least they work by providing that | |
1296 | link. Of course things manipulating prev can't go back. */ | |
1297 | prev->next = this_frame; | |
1298 | ||
055bb976 AC |
1299 | /* NOTE: cagney/2002-11-18: Should have been correctly setting the |
1300 | frame's type here, before anything else, and not last, at the | |
1301 | bottom of this function. The various | |
1302 | DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC, | |
1303 | DEPRECATED_INIT_FRAME_PC_FIRST and | |
1304 | DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds | |
1305 | that handle the frame not being correctly set from the start. | |
1306 | Unfortunatly those same work-arounds rely on the type defaulting | |
1307 | to NORMAL_FRAME. Ulgh! The new frame code does not have this | |
1308 | problem. */ | |
7df05f2b | 1309 | prev->type = UNKNOWN_FRAME; |
055bb976 | 1310 | |
06c77151 | 1311 | /* A legacy frame's ID is always computed here. Mark it as valid. */ |
d0a55772 | 1312 | prev->this_id.p = 1; |
06c77151 | 1313 | |
055bb976 AC |
1314 | /* Handle sentinel frame unwind as a special case. */ |
1315 | if (this_frame->level < 0) | |
1316 | { | |
1317 | /* Try to unwind the PC. If that doesn't work, assume we've reached | |
1318 | the oldest frame and simply return. Is there a better sentinal | |
1319 | value? The unwound PC value is then used to initialize the new | |
1320 | previous frame's type. | |
1321 | ||
1322 | Note that the pc-unwind is intentionally performed before the | |
1323 | frame chain. This is ok since, for old targets, both | |
618ce49f AC |
1324 | frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and |
1325 | DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures | |
1326 | have already been initialized (using | |
055bb976 AC |
1327 | DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order |
1328 | doesn't matter. | |
1329 | ||
1330 | By unwinding the PC first, it becomes possible to, in the case of | |
1331 | a dummy frame, avoid also unwinding the frame ID. This is | |
1332 | because (well ignoring the PPC) a dummy frame can be located | |
1333 | using THIS_FRAME's frame ID. */ | |
1334 | ||
11889732 AC |
1335 | deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame)); |
1336 | if (get_frame_pc (prev) == 0) | |
055bb976 AC |
1337 | { |
1338 | /* The allocated PREV_FRAME will be reclaimed when the frame | |
1339 | obstack is next purged. */ | |
1340 | if (frame_debug) | |
7f78e237 AC |
1341 | { |
1342 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1343 | fprint_frame (gdb_stdlog, NULL); | |
1344 | fprintf_unfiltered (gdb_stdlog, | |
1345 | " // unwound legacy PC zero }\n"); | |
1346 | } | |
055bb976 AC |
1347 | return NULL; |
1348 | } | |
055bb976 | 1349 | |
7df05f2b AC |
1350 | /* Set the unwind functions based on that identified PC. Ditto |
1351 | for the "type" but strongly prefer the unwinder's frame type. */ | |
d1340264 AC |
1352 | prev->unwind = frame_unwind_find_by_pc (current_gdbarch, |
1353 | get_frame_pc (prev)); | |
7df05f2b | 1354 | if (prev->unwind->type == UNKNOWN_FRAME) |
d1340264 | 1355 | prev->type = frame_type_from_pc (get_frame_pc (prev)); |
7df05f2b AC |
1356 | else |
1357 | prev->type = prev->unwind->type; | |
055bb976 AC |
1358 | |
1359 | /* Find the prev's frame's ID. */ | |
1360 | if (prev->type == DUMMY_FRAME | |
1361 | && gdbarch_unwind_dummy_id_p (current_gdbarch)) | |
1362 | { | |
1363 | /* When unwinding a normal frame, the stack structure is | |
1364 | determined by analyzing the frame's function's code (be | |
1365 | it using brute force prologue analysis, or the dwarf2 | |
1366 | CFI). In the case of a dummy frame, that simply isn't | |
1367 | possible. The The PC is either the program entry point, | |
1368 | or some random address on the stack. Trying to use that | |
1369 | PC to apply standard frame ID unwind techniques is just | |
1370 | asking for trouble. */ | |
e8a8712a | 1371 | /* Assume call_function_by_hand(), via SAVE_DUMMY_FRAME_TOS, |
055bb976 AC |
1372 | previously saved the dummy frame's ID. Things only work |
1373 | if the two return the same value. */ | |
1374 | gdb_assert (SAVE_DUMMY_FRAME_TOS_P ()); | |
1375 | /* Use an architecture specific method to extract the prev's | |
1376 | dummy ID from the next frame. Note that this method uses | |
1377 | frame_register_unwind to obtain the register values | |
1378 | needed to determine the dummy frame's ID. */ | |
d0a55772 AC |
1379 | prev->this_id.value = gdbarch_unwind_dummy_id (current_gdbarch, |
1380 | this_frame); | |
055bb976 AC |
1381 | } |
1382 | else | |
1383 | { | |
1384 | /* We're unwinding a sentinel frame, the PC of which is | |
1385 | pointing at a stack dummy. Fake up the dummy frame's ID | |
1386 | using the same sequence as is found a traditional | |
1387 | unwinder. Once all architectures supply the | |
1388 | unwind_dummy_id method, this code can go away. */ | |
d0a55772 | 1389 | prev->this_id.value = frame_id_build (read_fp (), read_pc ()); |
055bb976 AC |
1390 | } |
1391 | ||
1392 | /* Check that the unwound ID is valid. */ | |
d0a55772 | 1393 | if (!frame_id_p (prev->this_id.value)) |
055bb976 AC |
1394 | { |
1395 | if (frame_debug) | |
7f78e237 AC |
1396 | { |
1397 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1398 | fprint_frame (gdb_stdlog, NULL); | |
1399 | fprintf_unfiltered (gdb_stdlog, | |
1400 | " // unwound legacy ID invalid }\n"); | |
1401 | } | |
055bb976 AC |
1402 | return NULL; |
1403 | } | |
1404 | ||
1405 | /* Check that the new frame isn't inner to (younger, below, | |
1406 | next) the old frame. If that happens the frame unwind is | |
1407 | going backwards. */ | |
1408 | /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since | |
1409 | that doesn't have a valid frame ID. Should instead set the | |
1410 | sentinel frame's frame ID to a `sentinel'. Leave it until | |
1411 | after the switch to storing the frame ID, instead of the | |
1412 | frame base, in the frame object. */ | |
1413 | ||
055bb976 AC |
1414 | /* Link it in. */ |
1415 | this_frame->prev = prev; | |
055bb976 AC |
1416 | |
1417 | /* FIXME: cagney/2002-01-19: This call will go away. Instead of | |
1418 | initializing extra info, all frames will use the frame_cache | |
1419 | (passed to the unwind functions) to store additional frame | |
1420 | info. Unfortunatly legacy targets can't use | |
1421 | legacy_get_prev_frame() to unwind the sentinel frame and, | |
1422 | consequently, are forced to take this code path and rely on | |
1423 | the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to | |
1424 | initialize the inner-most frame. */ | |
1425 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) | |
1426 | { | |
1427 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev); | |
1428 | } | |
18adea3f AC |
1429 | |
1430 | if (prev->type == NORMAL_FRAME) | |
1431 | prev->this_id.value.code_addr | |
1432 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1433 | ||
7f78e237 AC |
1434 | if (frame_debug) |
1435 | { | |
1436 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1437 | fprint_frame (gdb_stdlog, prev); | |
1438 | fprintf_unfiltered (gdb_stdlog, " } // legacy innermost frame\n"); | |
1439 | } | |
055bb976 AC |
1440 | return prev; |
1441 | } | |
1442 | ||
eb4f72c5 AC |
1443 | /* This code only works on normal frames. A sentinel frame, where |
1444 | the level is -1, should never reach this code. */ | |
03febf99 | 1445 | gdb_assert (this_frame->level >= 0); |
4c1e7e9d AC |
1446 | |
1447 | /* On some machines it is possible to call a function without | |
1448 | setting up a stack frame for it. On these machines, we | |
1449 | define this macro to take two args; a frameinfo pointer | |
1450 | identifying a frame and a variable to set or clear if it is | |
1451 | or isn't leafless. */ | |
1452 | ||
1453 | /* Still don't want to worry about this except on the innermost | |
03febf99 | 1454 | frame. This macro will set FROMLEAF if THIS_FRAME is a frameless |
95adb866 | 1455 | function invocation. */ |
03febf99 | 1456 | if (this_frame->level == 0) |
95adb866 AC |
1457 | /* FIXME: 2002-11-09: Frameless functions can occure anywhere in |
1458 | the frame chain, not just the inner most frame! The generic, | |
1459 | per-architecture, frame code should handle this and the below | |
1460 | should simply be removed. */ | |
03febf99 | 1461 | fromleaf = FRAMELESS_FUNCTION_INVOCATION (this_frame); |
95adb866 AC |
1462 | else |
1463 | fromleaf = 0; | |
1464 | ||
1465 | if (fromleaf) | |
1466 | /* A frameless inner-most frame. The `FP' (which isn't an | |
1467 | architecture frame-pointer register!) of the caller is the same | |
1468 | as the callee. */ | |
1469 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
1470 | edge condition. Instead the per-architecture code should hande | |
1471 | it locally. */ | |
03febf99 | 1472 | address = get_frame_base (this_frame); |
95adb866 | 1473 | else |
4c1e7e9d AC |
1474 | { |
1475 | /* Two macros defined in tm.h specify the machine-dependent | |
1476 | actions to be performed here. | |
95adb866 | 1477 | |
4c1e7e9d | 1478 | First, get the frame's chain-pointer. |
95adb866 | 1479 | |
4c1e7e9d AC |
1480 | If that is zero, the frame is the outermost frame or a leaf |
1481 | called by the outermost frame. This means that if start | |
1482 | calls main without a frame, we'll return 0 (which is fine | |
1483 | anyway). | |
1484 | ||
1485 | Nope; there's a problem. This also returns when the current | |
1486 | routine is a leaf of main. This is unacceptable. We move | |
1487 | this to after the ffi test; I'd rather have backtraces from | |
1488 | start go curfluy than have an abort called from main not show | |
1489 | main. */ | |
618ce49f AC |
1490 | gdb_assert (DEPRECATED_FRAME_CHAIN_P ()); |
1491 | address = DEPRECATED_FRAME_CHAIN (this_frame); | |
4c1e7e9d | 1492 | |
e6ba3bc9 | 1493 | if (!legacy_frame_chain_valid (address, this_frame)) |
7f78e237 AC |
1494 | { |
1495 | if (frame_debug) | |
1496 | { | |
1497 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1498 | fprint_frame (gdb_stdlog, NULL); | |
1499 | fprintf_unfiltered (gdb_stdlog, | |
1500 | " // legacy frame chain invalid }\n"); | |
1501 | } | |
1502 | return NULL; | |
1503 | } | |
4c1e7e9d AC |
1504 | } |
1505 | if (address == 0) | |
7f78e237 AC |
1506 | { |
1507 | if (frame_debug) | |
1508 | { | |
1509 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1510 | fprint_frame (gdb_stdlog, NULL); | |
1511 | fprintf_unfiltered (gdb_stdlog, | |
1512 | " // legacy frame chain NULL }\n"); | |
1513 | } | |
1514 | return NULL; | |
1515 | } | |
4c1e7e9d | 1516 | |
055bb976 | 1517 | /* Link in the already allocated prev frame. */ |
03febf99 | 1518 | this_frame->prev = prev; |
11889732 | 1519 | deprecated_update_frame_base_hack (prev, address); |
4c1e7e9d | 1520 | |
95adb866 | 1521 | /* This change should not be needed, FIXME! We should determine |
a5afb99f | 1522 | whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen |
e9582e71 AC |
1523 | after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple |
1524 | way to express what goes on here. | |
95adb866 | 1525 | |
e9582e71 AC |
1526 | DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places: |
1527 | create_new_frame (where the PC is already set up) and here (where | |
1528 | it isn't). DEPRECATED_INIT_FRAME_PC is only called from here, | |
1529 | always after DEPRECATED_INIT_EXTRA_FRAME_INFO. | |
95adb866 | 1530 | |
e9582e71 AC |
1531 | The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO |
1532 | requires the PC value (which hasn't been set yet). Some other | |
1533 | machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO | |
1534 | before they can do DEPRECATED_INIT_FRAME_PC. Phoo. | |
95adb866 | 1535 | |
2ca6c561 AC |
1536 | We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more |
1537 | complication to an already overcomplicated part of GDB. | |
1538 | gnu@cygnus.com, 15Sep92. | |
95adb866 | 1539 | |
a5afb99f | 1540 | Assuming that some machines need DEPRECATED_INIT_FRAME_PC after |
e9582e71 | 1541 | DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme: |
95adb866 AC |
1542 | |
1543 | SETUP_INNERMOST_FRAME(): Default version is just create_new_frame | |
1544 | (read_fp ()), read_pc ()). Machines with extra frame info would | |
1545 | do that (or the local equivalent) and then set the extra fields. | |
1546 | ||
1547 | SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that | |
1548 | create_new_frame would no longer init extra frame info; | |
1549 | SETUP_ARBITRARY_FRAME would have to do that. | |
1550 | ||
e9582e71 AC |
1551 | INIT_PREV_FRAME(fromleaf, prev) Replace |
1552 | DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC. | |
1553 | This should also return a flag saying whether to keep the new | |
1554 | frame, or whether to discard it, because on some machines (e.g. | |
618ce49f AC |
1555 | mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID |
1556 | called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good | |
1557 | way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID | |
1558 | into the extra fields of the new frame). std_frame_pc(fromleaf, | |
1559 | prev) | |
95adb866 AC |
1560 | |
1561 | This is the default setting for INIT_PREV_FRAME. It just does | |
a5afb99f AC |
1562 | what the default DEPRECATED_INIT_FRAME_PC does. Some machines |
1563 | will call it from INIT_PREV_FRAME (either at the beginning, the | |
1564 | end, or in the middle). Some machines won't use it. | |
95adb866 AC |
1565 | |
1566 | kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */ | |
1567 | ||
1568 | /* NOTE: cagney/2002-11-09: Just ignore the above! There is no | |
1569 | reason for things to be this complicated. | |
1570 | ||
1571 | The trick is to assume that there is always a frame. Instead of | |
1572 | special casing the inner-most frame, create fake frame | |
1573 | (containing the hardware registers) that is inner to the | |
1574 | user-visible inner-most frame (...) and then unwind from that. | |
1575 | That way architecture code can use use the standard | |
1576 | frame_XX_unwind() functions and not differentiate between the | |
1577 | inner most and any other case. | |
1578 | ||
1579 | Since there is always a frame to unwind from, there is always | |
03febf99 | 1580 | somewhere (THIS_FRAME) to store all the info needed to construct |
95adb866 AC |
1581 | a new (previous) frame without having to first create it. This |
1582 | means that the convolution below - needing to carefully order a | |
1583 | frame's initialization - isn't needed. | |
1584 | ||
618ce49f AC |
1585 | The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least |
1586 | for a more up-to-date architecture, always calls | |
1587 | FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but | |
1588 | without first needing the frame! Instead of the convolution | |
1589 | below, we could have simply called FRAME_SAVED_PC() and been done | |
1590 | with it! Note that FRAME_SAVED_PC() is being superseed by | |
1591 | frame_pc_unwind() and that function does have somewhere to cache | |
1592 | that PC value. */ | |
4c1e7e9d | 1593 | |
2ca6c561 | 1594 | if (DEPRECATED_INIT_FRAME_PC_FIRST_P ()) |
11889732 AC |
1595 | deprecated_update_frame_pc_hack (prev, |
1596 | DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf, | |
1597 | prev)); | |
4c1e7e9d | 1598 | |
e9582e71 AC |
1599 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1600 | DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev); | |
4c1e7e9d AC |
1601 | |
1602 | /* This entry is in the frame queue now, which is good since | |
95adb866 AC |
1603 | FRAME_SAVED_PC may use that queue to figure out its value (see |
1604 | tm-sparc.h). We want the pc saved in the inferior frame. */ | |
a5afb99f | 1605 | if (DEPRECATED_INIT_FRAME_PC_P ()) |
11889732 AC |
1606 | deprecated_update_frame_pc_hack (prev, |
1607 | DEPRECATED_INIT_FRAME_PC (fromleaf, | |
1608 | prev)); | |
4c1e7e9d | 1609 | |
95adb866 AC |
1610 | /* If ->frame and ->pc are unchanged, we are in the process of |
1611 | getting ourselves into an infinite backtrace. Some architectures | |
618ce49f AC |
1612 | check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems |
1613 | like there is no reason this can't be an architecture-independent | |
1614 | check. */ | |
11889732 AC |
1615 | if (get_frame_base (prev) == get_frame_base (this_frame) |
1616 | && get_frame_pc (prev) == get_frame_pc (this_frame)) | |
4c1e7e9d | 1617 | { |
03febf99 | 1618 | this_frame->prev = NULL; |
95adb866 | 1619 | obstack_free (&frame_cache_obstack, prev); |
7f78e237 AC |
1620 | if (frame_debug) |
1621 | { | |
1622 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1623 | fprint_frame (gdb_stdlog, NULL); | |
1624 | fprintf_unfiltered (gdb_stdlog, | |
1625 | " // legacy this.id == prev.id }\n"); | |
1626 | } | |
95adb866 | 1627 | return NULL; |
4c1e7e9d AC |
1628 | } |
1629 | ||
1630 | /* Initialize the code used to unwind the frame PREV based on the PC | |
1631 | (and probably other architectural information). The PC lets you | |
1632 | check things like the debug info at that point (dwarf2cfi?) and | |
1633 | use that to decide how the frame should be unwound. */ | |
11889732 AC |
1634 | prev->unwind = frame_unwind_find_by_pc (current_gdbarch, |
1635 | get_frame_pc (prev)); | |
4c1e7e9d | 1636 | |
7df05f2b AC |
1637 | /* If the unwinder provides a frame type, use it. Otherwize |
1638 | continue on to that heuristic mess. */ | |
1639 | if (prev->unwind->type != UNKNOWN_FRAME) | |
1640 | { | |
1641 | prev->type = prev->unwind->type; | |
18adea3f AC |
1642 | if (prev->type == NORMAL_FRAME) |
1643 | prev->this_id.value.code_addr | |
1644 | = get_pc_function_start (prev->this_id.value.code_addr); | |
7f78e237 AC |
1645 | if (frame_debug) |
1646 | { | |
1647 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1648 | fprint_frame (gdb_stdlog, prev); | |
1649 | fprintf_unfiltered (gdb_stdlog, " } // legacy with unwound type\n"); | |
1650 | } | |
7df05f2b AC |
1651 | return prev; |
1652 | } | |
1653 | ||
5a203e44 AC |
1654 | /* NOTE: cagney/2002-11-18: The code segments, found in |
1655 | create_new_frame and get_prev_frame(), that initializes the | |
1656 | frames type is subtly different. The latter only updates ->type | |
1657 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops | |
1658 | get_prev_frame() overriding the frame's type when the INIT code | |
1659 | has previously set it. This is really somewhat bogus. The | |
1660 | initialization, as seen in create_new_frame(), should occur | |
1661 | before the INIT function has been called. */ | |
07555a72 | 1662 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
ae45cd16 | 1663 | && (DEPRECATED_PC_IN_CALL_DUMMY_P () |
11889732 AC |
1664 | ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev), 0, 0) |
1665 | : pc_in_dummy_frame (get_frame_pc (prev)))) | |
5a203e44 AC |
1666 | prev->type = DUMMY_FRAME; |
1667 | else | |
1668 | { | |
1669 | /* FIXME: cagney/2002-11-10: This should be moved to before the | |
1670 | INIT code above so that the INIT code knows what the frame's | |
1671 | type is (in fact, for a [generic] dummy-frame, the type can | |
1672 | be set and then the entire initialization can be skipped. | |
1673 | Unforunatly, its the INIT code that sets the PC (Hmm, catch | |
1674 | 22). */ | |
1675 | char *name; | |
11889732 AC |
1676 | find_pc_partial_function (get_frame_pc (prev), &name, NULL, NULL); |
1677 | if (PC_IN_SIGTRAMP (get_frame_pc (prev), name)) | |
5a203e44 AC |
1678 | prev->type = SIGTRAMP_FRAME; |
1679 | /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some | |
1680 | architectures are forcing the frame's type in INIT so we | |
1681 | don't want to override it here. Remember, NORMAL_FRAME == 0, | |
1682 | so it all works (just :-/). Once this initialization is | |
1683 | moved to the start of this function, all this nastness will | |
1684 | go away. */ | |
1685 | } | |
4c1e7e9d | 1686 | |
18adea3f AC |
1687 | if (prev->type == NORMAL_FRAME) |
1688 | prev->this_id.value.code_addr | |
1689 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1690 | ||
7f78e237 AC |
1691 | if (frame_debug) |
1692 | { | |
1693 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1694 | fprint_frame (gdb_stdlog, prev); | |
1695 | fprintf_unfiltered (gdb_stdlog, " } // legacy with confused type\n"); | |
1696 | } | |
1697 | ||
4c1e7e9d AC |
1698 | return prev; |
1699 | } | |
1700 | ||
eb4f72c5 | 1701 | /* Return a structure containing various interesting information |
03febf99 | 1702 | about the frame that called THIS_FRAME. Returns NULL |
eb4f72c5 AC |
1703 | if there is no such frame. */ |
1704 | ||
1705 | struct frame_info * | |
03febf99 | 1706 | get_prev_frame (struct frame_info *this_frame) |
eb4f72c5 AC |
1707 | { |
1708 | struct frame_info *prev_frame; | |
1709 | ||
7f78e237 AC |
1710 | if (frame_debug) |
1711 | { | |
1712 | fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame="); | |
1713 | if (this_frame != NULL) | |
1714 | fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level); | |
1715 | else | |
1716 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
1717 | fprintf_unfiltered (gdb_stdlog, ") "); | |
1718 | } | |
1719 | ||
eb4f72c5 AC |
1720 | /* Return the inner-most frame, when the caller passes in NULL. */ |
1721 | /* NOTE: cagney/2002-11-09: Not sure how this would happen. The | |
1722 | caller should have previously obtained a valid frame using | |
1723 | get_selected_frame() and then called this code - only possibility | |
1724 | I can think of is code behaving badly. | |
1725 | ||
1726 | NOTE: cagney/2003-01-10: Talk about code behaving badly. Check | |
1727 | block_innermost_frame(). It does the sequence: frame = NULL; | |
1728 | while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why | |
1729 | it couldn't be written better, I don't know. | |
1730 | ||
1731 | NOTE: cagney/2003-01-11: I suspect what is happening is | |
1732 | block_innermost_frame() is, when the target has no state | |
1733 | (registers, memory, ...), still calling this function. The | |
1734 | assumption being that this function will return NULL indicating | |
1735 | that a frame isn't possible, rather than checking that the target | |
1736 | has state and then calling get_current_frame() and | |
1737 | get_prev_frame(). This is a guess mind. */ | |
03febf99 | 1738 | if (this_frame == NULL) |
eb4f72c5 AC |
1739 | { |
1740 | /* NOTE: cagney/2002-11-09: There was a code segment here that | |
1741 | would error out when CURRENT_FRAME was NULL. The comment | |
1742 | that went with it made the claim ... | |
1743 | ||
1744 | ``This screws value_of_variable, which just wants a nice | |
1745 | clean NULL return from block_innermost_frame if there are no | |
1746 | frames. I don't think I've ever seen this message happen | |
1747 | otherwise. And returning NULL here is a perfectly legitimate | |
1748 | thing to do.'' | |
1749 | ||
1750 | Per the above, this code shouldn't even be called with a NULL | |
03febf99 | 1751 | THIS_FRAME. */ |
eb4f72c5 AC |
1752 | return current_frame; |
1753 | } | |
1754 | ||
1755 | /* There is always a frame. If this assertion fails, suspect that | |
1756 | something should be calling get_selected_frame() or | |
1757 | get_current_frame(). */ | |
03febf99 | 1758 | gdb_assert (this_frame != NULL); |
eb4f72c5 | 1759 | |
03febf99 | 1760 | if (this_frame->level >= 0 |
eb4f72c5 | 1761 | && !backtrace_below_main |
03febf99 | 1762 | && inside_main_func (get_frame_pc (this_frame))) |
eb4f72c5 AC |
1763 | /* Don't unwind past main(), bug always unwind the sentinel frame. |
1764 | Note, this is done _before_ the frame has been marked as | |
1765 | previously unwound. That way if the user later decides to | |
1766 | allow unwinds past main(), that just happens. */ | |
ac2bd0a9 AC |
1767 | { |
1768 | if (frame_debug) | |
7f78e237 | 1769 | fprintf_unfiltered (gdb_stdlog, "-> NULL // inside main func }\n"); |
ac2bd0a9 AC |
1770 | return NULL; |
1771 | } | |
eb4f72c5 AC |
1772 | |
1773 | /* Only try to do the unwind once. */ | |
03febf99 | 1774 | if (this_frame->prev_p) |
7f78e237 AC |
1775 | { |
1776 | if (frame_debug) | |
1777 | { | |
1778 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1779 | fprint_frame (gdb_stdlog, this_frame->prev); | |
1780 | fprintf_unfiltered (gdb_stdlog, " // cached \n"); | |
1781 | } | |
1782 | return this_frame->prev; | |
1783 | } | |
03febf99 | 1784 | this_frame->prev_p = 1; |
eb4f72c5 | 1785 | |
ce0c7262 | 1786 | #if 0 |
b14185ce AC |
1787 | /* If we're inside the entry file, it isn't valid. Don't apply this |
1788 | test to a dummy frame - dummy frame PC's typically land in the | |
1789 | entry file. Don't apply this test to the sentinel frame. | |
1790 | Sentinel frames should always be allowed to unwind. */ | |
eb4f72c5 AC |
1791 | /* NOTE: drow/2002-12-25: should there be a way to disable this |
1792 | check? It assumes a single small entry file, and the way some | |
1793 | debug readers (e.g. dbxread) figure out which object is the | |
1794 | entry file is somewhat hokey. */ | |
1795 | /* NOTE: cagney/2003-01-10: If there is a way of disabling this test | |
1796 | then it should probably be moved to before the ->prev_p test, | |
1797 | above. */ | |
ce0c7262 CV |
1798 | /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call to |
1799 | inside_entry_file destroys a meaningful backtrace under some | |
1800 | conditions. E. g. the backtrace tests in the asm-source testcase | |
1801 | are broken for some targets. In this test the functions are all | |
1802 | implemented as part of one file and the testcase is not necessarily | |
1803 | linked with a start file (depending on the target). What happens is, | |
1804 | that the first frame is printed normaly and following frames are | |
1805 | treated as being inside the enttry file then. This way, only the | |
1806 | #0 frame is printed in the backtrace output. */ | |
03febf99 AC |
1807 | if (this_frame->type != DUMMY_FRAME && this_frame->level >= 0 |
1808 | && inside_entry_file (get_frame_pc (this_frame))) | |
ac2bd0a9 AC |
1809 | { |
1810 | if (frame_debug) | |
7f78e237 AC |
1811 | { |
1812 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1813 | fprint_frame (gdb_stdlog, NULL); | |
1814 | fprintf_unfiltered (gdb_stdlog, " // inside entry file }\n"); | |
1815 | } | |
eb4f72c5 | 1816 | return NULL; |
ac2bd0a9 | 1817 | } |
ce0c7262 | 1818 | #endif |
eb4f72c5 | 1819 | |
b14185ce AC |
1820 | /* If we're already inside the entry function for the main objfile, |
1821 | then it isn't valid. Don't apply this test to a dummy frame - | |
1822 | dummy frame PC's typically land in the entry func. Don't apply | |
1823 | this test to the sentinel frame. Sentinel frames should always | |
1824 | be allowed to unwind. */ | |
1825 | /* NOTE: cagney/2003-02-25: Don't enable until someone has found | |
1826 | hard evidence that this is needed. */ | |
1827 | if (0 | |
03febf99 AC |
1828 | && this_frame->type != DUMMY_FRAME && this_frame->level >= 0 |
1829 | && inside_entry_func (get_frame_pc (this_frame))) | |
b14185ce AC |
1830 | { |
1831 | if (frame_debug) | |
7f78e237 AC |
1832 | { |
1833 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1834 | fprint_frame (gdb_stdlog, NULL); | |
1835 | fprintf_unfiltered (gdb_stdlog, "// inside entry func }\n"); | |
1836 | } | |
b14185ce AC |
1837 | return NULL; |
1838 | } | |
1839 | ||
eb4f72c5 | 1840 | /* If any of the old frame initialization methods are around, use |
055bb976 AC |
1841 | the legacy get_prev_frame method. */ |
1842 | if (legacy_frame_p (current_gdbarch)) | |
ac2bd0a9 | 1843 | { |
03febf99 | 1844 | prev_frame = legacy_get_prev_frame (this_frame); |
ac2bd0a9 AC |
1845 | return prev_frame; |
1846 | } | |
eb4f72c5 | 1847 | |
270c3b1d AC |
1848 | /* Check that this frame's ID was valid. If it wasn't, don't try to |
1849 | unwind to the prev frame. Be careful to not apply this test to | |
1850 | the sentinel frame. */ | |
1851 | if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame))) | |
1852 | { | |
1853 | if (frame_debug) | |
7f78e237 AC |
1854 | { |
1855 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1856 | fprint_frame (gdb_stdlog, NULL); | |
1857 | fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n"); | |
1858 | } | |
270c3b1d AC |
1859 | return NULL; |
1860 | } | |
1861 | ||
1862 | /* Check that this frame's ID isn't inner to (younger, below, next) | |
1863 | the next frame. This happens when frame unwind goes backwards. | |
1864 | Since the sentinel frame isn't valid, don't apply this if this | |
1865 | frame is entier the inner-most or sentinel frame. */ | |
1866 | if (this_frame->level > 0 | |
1867 | && frame_id_inner (get_frame_id (this_frame), | |
1868 | get_frame_id (this_frame->next))) | |
1869 | error ("This frame inner-to next frame (corrupt stack?)"); | |
1870 | ||
1871 | /* Check that this and the next frame are different. If they are | |
1872 | not, there is most likely a stack cycle. As with the inner-than | |
1873 | test, avoid the inner-most and sentinel frames. */ | |
1874 | /* FIXME: cagney/2003-03-17: Can't yet enable this this check. The | |
1875 | frame_id_eq() method doesn't yet use function addresses when | |
1876 | comparing frame IDs. */ | |
1877 | if (0 | |
1878 | && this_frame->level > 0 | |
1879 | && frame_id_eq (get_frame_id (this_frame), | |
1880 | get_frame_id (this_frame->next))) | |
1881 | error ("This frame identical to next frame (corrupt stack?)"); | |
1882 | ||
eb4f72c5 AC |
1883 | /* Allocate the new frame but do not wire it in to the frame chain. |
1884 | Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along | |
1885 | frame->next to pull some fancy tricks (of course such code is, by | |
1886 | definition, recursive). Try to prevent it. | |
1887 | ||
1888 | There is no reason to worry about memory leaks, should the | |
1889 | remainder of the function fail. The allocated memory will be | |
1890 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1891 | been here before' check above will stop repeated memory | |
1892 | allocation calls. */ | |
1893 | prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
03febf99 | 1894 | prev_frame->level = this_frame->level + 1; |
eb4f72c5 AC |
1895 | |
1896 | /* Try to unwind the PC. If that doesn't work, assume we've reached | |
1897 | the oldest frame and simply return. Is there a better sentinal | |
1898 | value? The unwound PC value is then used to initialize the new | |
1899 | previous frame's type. | |
1900 | ||
1901 | Note that the pc-unwind is intentionally performed before the | |
1902 | frame chain. This is ok since, for old targets, both | |
618ce49f AC |
1903 | frame_pc_unwind (nee, FRAME_SAVED_PC) and |
1904 | DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures | |
1905 | have already been initialized (using | |
e9582e71 AC |
1906 | DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order |
1907 | doesn't matter. | |
eb4f72c5 AC |
1908 | |
1909 | By unwinding the PC first, it becomes possible to, in the case of | |
1910 | a dummy frame, avoid also unwinding the frame ID. This is | |
1911 | because (well ignoring the PPC) a dummy frame can be located | |
03febf99 | 1912 | using THIS_FRAME's frame ID. */ |
eb4f72c5 | 1913 | |
d1340264 | 1914 | if (frame_pc_unwind (this_frame) == 0) |
ac2bd0a9 AC |
1915 | { |
1916 | /* The allocated PREV_FRAME will be reclaimed when the frame | |
1917 | obstack is next purged. */ | |
1918 | if (frame_debug) | |
7f78e237 AC |
1919 | { |
1920 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1921 | fprint_frame (gdb_stdlog, NULL); | |
1922 | fprintf_unfiltered (gdb_stdlog, " // unwound PC zero }\n"); | |
1923 | } | |
ac2bd0a9 AC |
1924 | return NULL; |
1925 | } | |
eb4f72c5 | 1926 | |
c50901fd AC |
1927 | /* Don't yet compute ->unwind (and hence ->type). It is computed |
1928 | on-demand in get_frame_type, frame_register_unwind, and | |
1929 | get_frame_id. */ | |
eb4f72c5 | 1930 | |
c50901fd AC |
1931 | /* Don't yet compute the frame's ID. It is computed on-demand by |
1932 | get_frame_id(). */ | |
6dc42492 | 1933 | |
270c3b1d AC |
1934 | /* The unwound frame ID is validate at the start of this function, |
1935 | as part of the logic to decide if that frame should be further | |
1936 | unwound, and not here while the prev frame is being created. | |
1937 | Doing this makes it possible for the user to examine a frame that | |
1938 | has an invalid frame ID. | |
1939 | ||
1940 | The very old VAX frame_args_address_correct() method noted: [...] | |
1941 | For the sake of argument, suppose that the stack is somewhat | |
1942 | trashed (which is one reason that "info frame" exists). So, | |
1943 | return 0 (indicating we don't know the address of the arglist) if | |
1944 | we don't know what frame this frame calls. */ | |
6dc42492 | 1945 | |
eb4f72c5 | 1946 | /* Link it in. */ |
03febf99 AC |
1947 | this_frame->prev = prev_frame; |
1948 | prev_frame->next = this_frame; | |
eb4f72c5 | 1949 | |
7f78e237 AC |
1950 | if (frame_debug) |
1951 | { | |
1952 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1953 | fprint_frame (gdb_stdlog, prev_frame); | |
1954 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1955 | } | |
1956 | ||
eb4f72c5 AC |
1957 | return prev_frame; |
1958 | } | |
1959 | ||
4c1e7e9d AC |
1960 | CORE_ADDR |
1961 | get_frame_pc (struct frame_info *frame) | |
1962 | { | |
d1340264 AC |
1963 | gdb_assert (frame->next != NULL); |
1964 | return frame_pc_unwind (frame->next); | |
4c1e7e9d AC |
1965 | } |
1966 | ||
1058bca7 AC |
1967 | static int |
1968 | pc_notcurrent (struct frame_info *frame) | |
1969 | { | |
1970 | /* If FRAME is not the innermost frame, that normally means that | |
1971 | FRAME->pc points at the return instruction (which is *after* the | |
1972 | call instruction), and we want to get the line containing the | |
1973 | call (because the call is where the user thinks the program is). | |
1974 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
1975 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
1976 | PC and such a PC indicates the current (rather than next) | |
1977 | instruction/line, consequently, for such cases, want to get the | |
1978 | line containing fi->pc. */ | |
1979 | struct frame_info *next = get_next_frame (frame); | |
1980 | int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME); | |
1981 | return notcurrent; | |
1982 | } | |
1983 | ||
1984 | void | |
1985 | find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal) | |
1986 | { | |
11889732 | 1987 | (*sal) = find_pc_line (get_frame_pc (frame), pc_notcurrent (frame)); |
1058bca7 AC |
1988 | } |
1989 | ||
c193f6ac AC |
1990 | /* Per "frame.h", return the ``address'' of the frame. Code should |
1991 | really be using get_frame_id(). */ | |
1992 | CORE_ADDR | |
1993 | get_frame_base (struct frame_info *fi) | |
1994 | { | |
d0a55772 | 1995 | return get_frame_id (fi).stack_addr; |
c193f6ac AC |
1996 | } |
1997 | ||
da62e633 AC |
1998 | /* High-level offsets into the frame. Used by the debug info. */ |
1999 | ||
2000 | CORE_ADDR | |
2001 | get_frame_base_address (struct frame_info *fi) | |
2002 | { | |
7df05f2b | 2003 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2004 | return 0; |
2005 | if (fi->base == NULL) | |
2006 | fi->base = frame_base_find_by_pc (current_gdbarch, get_frame_pc (fi)); | |
2007 | /* Sneaky: If the low-level unwind and high-level base code share a | |
2008 | common unwinder, let them share the prologue cache. */ | |
2009 | if (fi->base->unwind == fi->unwind) | |
2010 | return fi->base->this_base (fi->next, &fi->prologue_cache); | |
2011 | return fi->base->this_base (fi->next, &fi->base_cache); | |
2012 | } | |
2013 | ||
2014 | CORE_ADDR | |
2015 | get_frame_locals_address (struct frame_info *fi) | |
2016 | { | |
2017 | void **cache; | |
7df05f2b | 2018 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2019 | return 0; |
2020 | /* If there isn't a frame address method, find it. */ | |
2021 | if (fi->base == NULL) | |
2022 | fi->base = frame_base_find_by_pc (current_gdbarch, get_frame_pc (fi)); | |
2023 | /* Sneaky: If the low-level unwind and high-level base code share a | |
2024 | common unwinder, let them share the prologue cache. */ | |
2025 | if (fi->base->unwind == fi->unwind) | |
2026 | cache = &fi->prologue_cache; | |
2027 | else | |
2028 | cache = &fi->base_cache; | |
2029 | return fi->base->this_locals (fi->next, cache); | |
2030 | } | |
2031 | ||
2032 | CORE_ADDR | |
2033 | get_frame_args_address (struct frame_info *fi) | |
2034 | { | |
2035 | void **cache; | |
7df05f2b | 2036 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2037 | return 0; |
2038 | /* If there isn't a frame address method, find it. */ | |
2039 | if (fi->base == NULL) | |
2040 | fi->base = frame_base_find_by_pc (current_gdbarch, get_frame_pc (fi)); | |
2041 | /* Sneaky: If the low-level unwind and high-level base code share a | |
2042 | common unwinder, let them share the prologue cache. */ | |
2043 | if (fi->base->unwind == fi->unwind) | |
2044 | cache = &fi->prologue_cache; | |
2045 | else | |
2046 | cache = &fi->base_cache; | |
2047 | return fi->base->this_args (fi->next, cache); | |
2048 | } | |
2049 | ||
85cf597a AC |
2050 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
2051 | or -1 for a NULL frame. */ | |
2052 | ||
2053 | int | |
2054 | frame_relative_level (struct frame_info *fi) | |
2055 | { | |
2056 | if (fi == NULL) | |
2057 | return -1; | |
2058 | else | |
2059 | return fi->level; | |
2060 | } | |
2061 | ||
5a203e44 AC |
2062 | enum frame_type |
2063 | get_frame_type (struct frame_info *frame) | |
2064 | { | |
2065 | /* Some targets still don't use [generic] dummy frames. Catch them | |
2066 | here. */ | |
07555a72 | 2067 | if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES |
5a203e44 AC |
2068 | && deprecated_frame_in_dummy (frame)) |
2069 | return DUMMY_FRAME; | |
c50901fd AC |
2070 | if (frame->unwind == NULL) |
2071 | { | |
2072 | /* Initialize the frame's unwinder because it is that which | |
2073 | provides the frame's type. */ | |
2074 | frame->unwind = frame_unwind_find_by_pc (current_gdbarch, | |
2075 | get_frame_pc (frame)); | |
2076 | /* FIXME: cagney/2003-04-02: Rather than storing the frame's | |
2077 | type in the frame, the unwinder's type should be returned | |
2078 | directly. Unfortunatly, legacy code, called by | |
2079 | legacy_get_prev_frame, explicitly set the frames type using | |
2080 | the method deprecated_set_frame_type(). */ | |
2081 | gdb_assert (frame->unwind->type != UNKNOWN_FRAME); | |
2082 | frame->type = frame->unwind->type; | |
2083 | } | |
7df05f2b AC |
2084 | if (frame->type == UNKNOWN_FRAME) |
2085 | return NORMAL_FRAME; | |
2086 | else | |
2087 | return frame->type; | |
5a203e44 AC |
2088 | } |
2089 | ||
2090 | void | |
2091 | deprecated_set_frame_type (struct frame_info *frame, enum frame_type type) | |
2092 | { | |
2093 | /* Arrrg! See comment in "frame.h". */ | |
2094 | frame->type = type; | |
2095 | } | |
2096 | ||
0394eb2a AC |
2097 | struct frame_extra_info * |
2098 | get_frame_extra_info (struct frame_info *fi) | |
2099 | { | |
2100 | return fi->extra_info; | |
2101 | } | |
2102 | ||
2c517d0e AC |
2103 | struct frame_extra_info * |
2104 | frame_extra_info_zalloc (struct frame_info *fi, long size) | |
2105 | { | |
479ab5a0 | 2106 | fi->extra_info = frame_obstack_zalloc (size); |
2c517d0e AC |
2107 | return fi->extra_info; |
2108 | } | |
2109 | ||
b87efeee | 2110 | void |
2f107107 | 2111 | deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc) |
b87efeee | 2112 | { |
7f78e237 AC |
2113 | if (frame_debug) |
2114 | fprintf_unfiltered (gdb_stdlog, | |
2115 | "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n", | |
2116 | frame->level, paddr_nz (pc)); | |
e0d2ae16 AC |
2117 | /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are |
2118 | maintaining a locally allocated frame object. Since such frame's | |
2119 | are not in the frame chain, it isn't possible to assume that the | |
2120 | frame has a next. Sigh. */ | |
2121 | if (frame->next != NULL) | |
2122 | { | |
2123 | /* While we're at it, update this frame's cached PC value, found | |
2124 | in the next frame. Oh for the day when "struct frame_info" | |
2125 | is opaque and this hack on hack can just go away. */ | |
d1340264 AC |
2126 | frame->next->prev_pc.value = pc; |
2127 | frame->next->prev_pc.p = 1; | |
e0d2ae16 | 2128 | } |
2f107107 AC |
2129 | } |
2130 | ||
2131 | void | |
2132 | deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base) | |
2133 | { | |
7f78e237 AC |
2134 | if (frame_debug) |
2135 | fprintf_unfiltered (gdb_stdlog, | |
2136 | "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n", | |
2137 | frame->level, paddr_nz (base)); | |
2f107107 | 2138 | /* See comment in "frame.h". */ |
d0a55772 | 2139 | frame->this_id.value.stack_addr = base; |
b87efeee AC |
2140 | } |
2141 | ||
c8b8a898 AC |
2142 | void |
2143 | deprecated_set_frame_saved_regs_hack (struct frame_info *frame, | |
2144 | CORE_ADDR *saved_regs) | |
2145 | { | |
2146 | frame->saved_regs = saved_regs; | |
2147 | } | |
2148 | ||
2149 | void | |
2150 | deprecated_set_frame_extra_info_hack (struct frame_info *frame, | |
2151 | struct frame_extra_info *extra_info) | |
2152 | { | |
2153 | frame->extra_info = extra_info; | |
2154 | } | |
2155 | ||
483d36b2 AC |
2156 | void |
2157 | deprecated_set_frame_next_hack (struct frame_info *fi, | |
2158 | struct frame_info *next) | |
2159 | { | |
2160 | fi->next = next; | |
2161 | } | |
2162 | ||
2163 | void | |
2164 | deprecated_set_frame_prev_hack (struct frame_info *fi, | |
2165 | struct frame_info *prev) | |
2166 | { | |
2167 | fi->prev = prev; | |
2168 | } | |
2169 | ||
2d75187b AC |
2170 | struct context * |
2171 | deprecated_get_frame_context (struct frame_info *fi) | |
2172 | { | |
2173 | return fi->context; | |
2174 | } | |
2175 | ||
2176 | void | |
2177 | deprecated_set_frame_context (struct frame_info *fi, | |
2178 | struct context *context) | |
2179 | { | |
2180 | fi->context = context; | |
2181 | } | |
2182 | ||
c8b8a898 AC |
2183 | struct frame_info * |
2184 | deprecated_frame_xmalloc (void) | |
2185 | { | |
18adea3f AC |
2186 | struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info); |
2187 | frame->this_id.p = 1; | |
c8b8a898 AC |
2188 | return frame; |
2189 | } | |
2190 | ||
f6c609c4 AC |
2191 | struct frame_info * |
2192 | deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs, | |
2193 | long sizeof_extra_info) | |
2194 | { | |
2195 | struct frame_info *frame = deprecated_frame_xmalloc (); | |
2196 | make_cleanup (xfree, frame); | |
2197 | if (sizeof_saved_regs > 0) | |
2198 | { | |
2199 | frame->saved_regs = xcalloc (1, sizeof_saved_regs); | |
2200 | make_cleanup (xfree, frame->saved_regs); | |
2201 | } | |
2202 | if (sizeof_extra_info > 0) | |
2203 | { | |
2204 | frame->extra_info = xcalloc (1, sizeof_extra_info); | |
2205 | make_cleanup (xfree, frame->extra_info); | |
2206 | } | |
2207 | return frame; | |
2208 | } | |
c8b8a898 | 2209 | |
1594fa56 AC |
2210 | int |
2211 | legacy_frame_p (struct gdbarch *current_gdbarch) | |
2212 | { | |
2213 | return (DEPRECATED_INIT_FRAME_PC_P () | |
2214 | || DEPRECATED_INIT_FRAME_PC_FIRST_P () | |
2215 | || DEPRECATED_INIT_EXTRA_FRAME_INFO_P () | |
618ce49f | 2216 | || DEPRECATED_FRAME_CHAIN_P () |
055bb976 AC |
2217 | || !gdbarch_unwind_dummy_id_p (current_gdbarch) |
2218 | || !SAVE_DUMMY_FRAME_TOS_P ()); | |
1594fa56 AC |
2219 | } |
2220 | ||
4c1e7e9d AC |
2221 | void |
2222 | _initialize_frame (void) | |
2223 | { | |
2224 | obstack_init (&frame_cache_obstack); | |
eb4f72c5 AC |
2225 | |
2226 | /* FIXME: cagney/2003-01-19: This command needs a rename. Suggest | |
2227 | `set backtrace {past,beyond,...}-main'. Also suggest adding `set | |
2228 | backtrace ...-start' to control backtraces past start. The | |
2229 | problem with `below' is that it stops the `up' command. */ | |
2230 | ||
2231 | add_setshow_boolean_cmd ("backtrace-below-main", class_obscure, | |
2232 | &backtrace_below_main, "\ | |
2233 | Set whether backtraces should continue past \"main\".\n\ | |
2234 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2235 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2236 | of the stack trace.", "\ | |
2237 | Show whether backtraces should continue past \"main\".\n\ | |
2238 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2239 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2240 | of the stack trace.", | |
2241 | NULL, NULL, &setlist, &showlist); | |
ac2bd0a9 AC |
2242 | |
2243 | ||
2244 | /* Debug this files internals. */ | |
2245 | add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger, | |
2246 | &frame_debug, "Set frame debugging.\n\ | |
2247 | When non-zero, frame specific internal debugging is enabled.", &setdebuglist), | |
2248 | &showdebuglist); | |
4c1e7e9d | 2249 | } |