Commit | Line | Data |
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4f460812 | 1 | /* Cache and manage frames for GDB, the GNU debugger. |
96cb11df AC |
2 | |
3 | Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, | |
5bf00f29 | 4 | 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
d65fe839 AC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "target.h" | |
26 | #include "value.h" | |
39f77062 | 27 | #include "inferior.h" /* for inferior_ptid */ |
4e052eda | 28 | #include "regcache.h" |
4f460812 | 29 | #include "gdb_assert.h" |
e36180d7 | 30 | #include "gdb_string.h" |
eb8bc282 | 31 | #include "user-regs.h" |
4c1e7e9d AC |
32 | #include "gdb_obstack.h" |
33 | #include "dummy-frame.h" | |
a94dd1fd | 34 | #include "sentinel-frame.h" |
4c1e7e9d AC |
35 | #include "gdbcore.h" |
36 | #include "annotate.h" | |
6e7f8b9c | 37 | #include "language.h" |
494cca16 | 38 | #include "frame-unwind.h" |
da62e633 | 39 | #include "frame-base.h" |
eb4f72c5 AC |
40 | #include "command.h" |
41 | #include "gdbcmd.h" | |
f4c5303c | 42 | #include "observer.h" |
eb4f72c5 | 43 | |
5613d8d3 AC |
44 | static struct frame_info *get_prev_frame_1 (struct frame_info *this_frame); |
45 | ||
bd013d54 AC |
46 | /* We keep a cache of stack frames, each of which is a "struct |
47 | frame_info". The innermost one gets allocated (in | |
48 | wait_for_inferior) each time the inferior stops; current_frame | |
49 | points to it. Additional frames get allocated (in get_prev_frame) | |
50 | as needed, and are chained through the next and prev fields. Any | |
51 | time that the frame cache becomes invalid (most notably when we | |
52 | execute something, but also if we change how we interpret the | |
53 | frames (e.g. "set heuristic-fence-post" in mips-tdep.c, or anything | |
54 | which reads new symbols)), we should call reinit_frame_cache. */ | |
55 | ||
56 | struct frame_info | |
57 | { | |
58 | /* Level of this frame. The inner-most (youngest) frame is at level | |
59 | 0. As you move towards the outer-most (oldest) frame, the level | |
60 | increases. This is a cached value. It could just as easily be | |
61 | computed by counting back from the selected frame to the inner | |
62 | most frame. */ | |
bbde78fa | 63 | /* NOTE: cagney/2002-04-05: Perhaps a level of ``-1'' should be |
bd013d54 AC |
64 | reserved to indicate a bogus frame - one that has been created |
65 | just to keep GDB happy (GDB always needs a frame). For the | |
66 | moment leave this as speculation. */ | |
67 | int level; | |
68 | ||
69 | /* The frame's type. */ | |
55699d59 AC |
70 | /* FIXME: cagney/2004-05-01: Should instead just use ->unwind->type. |
71 | Unfortunately, legacy_get_prev_frame is still explicitly setting | |
72 | the type. Eliminate that method and this field can be | |
73 | eliminated. */ | |
bd013d54 AC |
74 | enum frame_type type; |
75 | ||
76 | /* For each register, address of where it was saved on entry to the | |
77 | frame, or zero if it was not saved on entry to this frame. This | |
78 | includes special registers such as pc and fp saved in special | |
79 | ways in the stack frame. The SP_REGNUM is even more special, the | |
80 | address here is the sp for the previous frame, not the address | |
81 | where the sp was saved. */ | |
82 | /* Allocated by frame_saved_regs_zalloc () which is called / | |
83 | initialized by DEPRECATED_FRAME_INIT_SAVED_REGS(). */ | |
84 | CORE_ADDR *saved_regs; /*NUM_REGS + NUM_PSEUDO_REGS*/ | |
85 | ||
86 | /* Anything extra for this structure that may have been defined in | |
87 | the machine dependent files. */ | |
88 | /* Allocated by frame_extra_info_zalloc () which is called / | |
89 | initialized by DEPRECATED_INIT_EXTRA_FRAME_INFO */ | |
90 | struct frame_extra_info *extra_info; | |
91 | ||
bd013d54 AC |
92 | /* The frame's low-level unwinder and corresponding cache. The |
93 | low-level unwinder is responsible for unwinding register values | |
94 | for the previous frame. The low-level unwind methods are | |
bbde78fa | 95 | selected based on the presence, or otherwise, of register unwind |
bd013d54 AC |
96 | information such as CFI. */ |
97 | void *prologue_cache; | |
98 | const struct frame_unwind *unwind; | |
99 | ||
100 | /* Cached copy of the previous frame's resume address. */ | |
101 | struct { | |
102 | int p; | |
103 | CORE_ADDR value; | |
104 | } prev_pc; | |
105 | ||
106 | /* Cached copy of the previous frame's function address. */ | |
107 | struct | |
108 | { | |
109 | CORE_ADDR addr; | |
110 | int p; | |
111 | } prev_func; | |
112 | ||
113 | /* This frame's ID. */ | |
114 | struct | |
115 | { | |
116 | int p; | |
117 | struct frame_id value; | |
118 | } this_id; | |
119 | ||
120 | /* The frame's high-level base methods, and corresponding cache. | |
121 | The high level base methods are selected based on the frame's | |
122 | debug info. */ | |
123 | const struct frame_base *base; | |
124 | void *base_cache; | |
125 | ||
126 | /* Pointers to the next (down, inner, younger) and previous (up, | |
127 | outer, older) frame_info's in the frame cache. */ | |
128 | struct frame_info *next; /* down, inner, younger */ | |
129 | int prev_p; | |
130 | struct frame_info *prev; /* up, outer, older */ | |
131 | }; | |
132 | ||
ac2bd0a9 AC |
133 | /* Flag to control debugging. */ |
134 | ||
135 | static int frame_debug; | |
136 | ||
25d29d70 AC |
137 | /* Flag to indicate whether backtraces should stop at main et.al. */ |
138 | ||
139 | static int backtrace_past_main; | |
140 | static unsigned int backtrace_limit = UINT_MAX; | |
eb4f72c5 | 141 | |
d65fe839 | 142 | |
00905d52 | 143 | void |
7f78e237 AC |
144 | fprint_frame_id (struct ui_file *file, struct frame_id id) |
145 | { | |
48c66725 | 146 | fprintf_unfiltered (file, "{stack=0x%s,code=0x%s,special=0x%s}", |
7f78e237 | 147 | paddr_nz (id.stack_addr), |
48c66725 JJ |
148 | paddr_nz (id.code_addr), |
149 | paddr_nz (id.special_addr)); | |
7f78e237 AC |
150 | } |
151 | ||
152 | static void | |
153 | fprint_frame_type (struct ui_file *file, enum frame_type type) | |
154 | { | |
155 | switch (type) | |
156 | { | |
157 | case UNKNOWN_FRAME: | |
158 | fprintf_unfiltered (file, "UNKNOWN_FRAME"); | |
159 | return; | |
160 | case NORMAL_FRAME: | |
161 | fprintf_unfiltered (file, "NORMAL_FRAME"); | |
162 | return; | |
163 | case DUMMY_FRAME: | |
164 | fprintf_unfiltered (file, "DUMMY_FRAME"); | |
165 | return; | |
166 | case SIGTRAMP_FRAME: | |
167 | fprintf_unfiltered (file, "SIGTRAMP_FRAME"); | |
168 | return; | |
169 | default: | |
170 | fprintf_unfiltered (file, "<unknown type>"); | |
171 | return; | |
172 | }; | |
173 | } | |
174 | ||
175 | static void | |
176 | fprint_frame (struct ui_file *file, struct frame_info *fi) | |
177 | { | |
178 | if (fi == NULL) | |
179 | { | |
180 | fprintf_unfiltered (file, "<NULL frame>"); | |
181 | return; | |
182 | } | |
183 | fprintf_unfiltered (file, "{"); | |
184 | fprintf_unfiltered (file, "level=%d", fi->level); | |
185 | fprintf_unfiltered (file, ","); | |
186 | fprintf_unfiltered (file, "type="); | |
187 | fprint_frame_type (file, fi->type); | |
188 | fprintf_unfiltered (file, ","); | |
189 | fprintf_unfiltered (file, "unwind="); | |
190 | if (fi->unwind != NULL) | |
191 | gdb_print_host_address (fi->unwind, file); | |
192 | else | |
193 | fprintf_unfiltered (file, "<unknown>"); | |
194 | fprintf_unfiltered (file, ","); | |
195 | fprintf_unfiltered (file, "pc="); | |
196 | if (fi->next != NULL && fi->next->prev_pc.p) | |
197 | fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_pc.value)); | |
198 | else | |
199 | fprintf_unfiltered (file, "<unknown>"); | |
200 | fprintf_unfiltered (file, ","); | |
201 | fprintf_unfiltered (file, "id="); | |
202 | if (fi->this_id.p) | |
203 | fprint_frame_id (file, fi->this_id.value); | |
204 | else | |
205 | fprintf_unfiltered (file, "<unknown>"); | |
206 | fprintf_unfiltered (file, ","); | |
207 | fprintf_unfiltered (file, "func="); | |
208 | if (fi->next != NULL && fi->next->prev_func.p) | |
209 | fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_func.addr)); | |
210 | else | |
211 | fprintf_unfiltered (file, "<unknown>"); | |
212 | fprintf_unfiltered (file, "}"); | |
213 | } | |
214 | ||
7a424e99 | 215 | /* Return a frame uniq ID that can be used to, later, re-find the |
101dcfbe AC |
216 | frame. */ |
217 | ||
7a424e99 AC |
218 | struct frame_id |
219 | get_frame_id (struct frame_info *fi) | |
101dcfbe AC |
220 | { |
221 | if (fi == NULL) | |
222 | { | |
7a424e99 | 223 | return null_frame_id; |
101dcfbe | 224 | } |
d0a55772 | 225 | if (!fi->this_id.p) |
101dcfbe | 226 | { |
06c77151 | 227 | gdb_assert (!legacy_frame_p (current_gdbarch)); |
7f78e237 AC |
228 | if (frame_debug) |
229 | fprintf_unfiltered (gdb_stdlog, "{ get_frame_id (fi=%d) ", | |
230 | fi->level); | |
c50901fd AC |
231 | /* Find the unwinder. */ |
232 | if (fi->unwind == NULL) | |
233 | { | |
82417da5 AC |
234 | fi->unwind = frame_unwind_find_by_frame (fi->next, |
235 | &fi->prologue_cache); | |
55699d59 AC |
236 | /* FIXME: cagney/2004-05-01: Should instead just use |
237 | ->unwind->type. Unfortunately, legacy_get_prev_frame is | |
238 | still explicitly setting the type. Eliminate that method | |
239 | and this field can be eliminated. */ | |
c50901fd AC |
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 | ||
5613d8d3 AC |
255 | struct frame_id |
256 | frame_unwind_id (struct frame_info *next_frame) | |
257 | { | |
258 | /* Use prev_frame, and not get_prev_frame. The latter will truncate | |
259 | the frame chain, leading to this function unintentionally | |
260 | returning a null_frame_id (e.g., when a caller requests the frame | |
261 | ID of "main()"s caller. */ | |
262 | return get_frame_id (get_prev_frame_1 (next_frame)); | |
263 | } | |
264 | ||
7a424e99 AC |
265 | const struct frame_id null_frame_id; /* All zeros. */ |
266 | ||
267 | struct frame_id | |
48c66725 JJ |
268 | frame_id_build_special (CORE_ADDR stack_addr, CORE_ADDR code_addr, |
269 | CORE_ADDR special_addr) | |
7a424e99 AC |
270 | { |
271 | struct frame_id id; | |
d0a55772 AC |
272 | id.stack_addr = stack_addr; |
273 | id.code_addr = code_addr; | |
48c66725 | 274 | id.special_addr = special_addr; |
7a424e99 AC |
275 | return id; |
276 | } | |
277 | ||
48c66725 JJ |
278 | struct frame_id |
279 | frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr) | |
280 | { | |
281 | return frame_id_build_special (stack_addr, code_addr, 0); | |
282 | } | |
283 | ||
7a424e99 AC |
284 | int |
285 | frame_id_p (struct frame_id l) | |
286 | { | |
d0a55772 AC |
287 | int p; |
288 | /* The .code can be NULL but the .stack cannot. */ | |
289 | p = (l.stack_addr != 0); | |
7f78e237 AC |
290 | if (frame_debug) |
291 | { | |
292 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_p (l="); | |
293 | fprint_frame_id (gdb_stdlog, l); | |
294 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", p); | |
295 | } | |
d0a55772 | 296 | return p; |
7a424e99 AC |
297 | } |
298 | ||
299 | int | |
300 | frame_id_eq (struct frame_id l, struct frame_id r) | |
301 | { | |
d0a55772 AC |
302 | int eq; |
303 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
304 | /* Like a NaN, if either ID is invalid, the result is false. */ | |
305 | eq = 0; | |
306 | else if (l.stack_addr != r.stack_addr) | |
307 | /* If .stack addresses are different, the frames are different. */ | |
308 | eq = 0; | |
309 | else if (l.code_addr == 0 || r.code_addr == 0) | |
310 | /* A zero code addr is a wild card, always succeed. */ | |
311 | eq = 1; | |
48c66725 JJ |
312 | else if (l.code_addr != r.code_addr) |
313 | /* If .code addresses are different, the frames are different. */ | |
314 | eq = 0; | |
315 | else if (l.special_addr == 0 || r.special_addr == 0) | |
316 | /* A zero special addr is a wild card (or unused), always succeed. */ | |
317 | eq = 1; | |
318 | else if (l.special_addr == r.special_addr) | |
319 | /* Frames are equal. */ | |
d0a55772 AC |
320 | eq = 1; |
321 | else | |
4aa79dcc AC |
322 | /* No luck. */ |
323 | eq = 0; | |
7f78e237 AC |
324 | if (frame_debug) |
325 | { | |
326 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (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", eq); | |
331 | } | |
d0a55772 | 332 | return eq; |
7a424e99 AC |
333 | } |
334 | ||
335 | int | |
336 | frame_id_inner (struct frame_id l, struct frame_id r) | |
337 | { | |
d0a55772 AC |
338 | int inner; |
339 | if (l.stack_addr == 0 || r.stack_addr == 0) | |
340 | /* Like NaN, any operation involving an invalid ID always fails. */ | |
341 | inner = 0; | |
342 | else | |
343 | /* Only return non-zero when strictly inner than. Note that, per | |
344 | comment in "frame.h", there is some fuzz here. Frameless | |
345 | functions are not strictly inner than (same .stack but | |
48c66725 | 346 | different .code and/or .special address). */ |
d0a55772 | 347 | inner = INNER_THAN (l.stack_addr, r.stack_addr); |
7f78e237 AC |
348 | if (frame_debug) |
349 | { | |
350 | fprintf_unfiltered (gdb_stdlog, "{ frame_id_inner (l="); | |
351 | fprint_frame_id (gdb_stdlog, l); | |
352 | fprintf_unfiltered (gdb_stdlog, ",r="); | |
353 | fprint_frame_id (gdb_stdlog, r); | |
354 | fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", inner); | |
355 | } | |
d0a55772 | 356 | return inner; |
7a424e99 AC |
357 | } |
358 | ||
101dcfbe AC |
359 | struct frame_info * |
360 | frame_find_by_id (struct frame_id id) | |
361 | { | |
362 | struct frame_info *frame; | |
363 | ||
364 | /* ZERO denotes the null frame, let the caller decide what to do | |
365 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 366 | if (!frame_id_p (id)) |
101dcfbe AC |
367 | return NULL; |
368 | ||
369 | for (frame = get_current_frame (); | |
370 | frame != NULL; | |
371 | frame = get_prev_frame (frame)) | |
372 | { | |
7a424e99 AC |
373 | struct frame_id this = get_frame_id (frame); |
374 | if (frame_id_eq (id, this)) | |
375 | /* An exact match. */ | |
376 | return frame; | |
377 | if (frame_id_inner (id, this)) | |
378 | /* Gone to far. */ | |
101dcfbe | 379 | return NULL; |
bbde78fa JM |
380 | /* Either we're not yet gone far enough out along the frame |
381 | chain (inner(this,id)), or we're comparing frameless functions | |
7a424e99 AC |
382 | (same .base, different .func, no test available). Struggle |
383 | on until we've definitly gone to far. */ | |
101dcfbe AC |
384 | } |
385 | return NULL; | |
386 | } | |
387 | ||
f18c5a73 | 388 | CORE_ADDR |
12cc2063 | 389 | frame_pc_unwind (struct frame_info *this_frame) |
f18c5a73 | 390 | { |
d1340264 | 391 | if (!this_frame->prev_pc.p) |
f18c5a73 | 392 | { |
12cc2063 AC |
393 | CORE_ADDR pc; |
394 | if (gdbarch_unwind_pc_p (current_gdbarch)) | |
395 | { | |
396 | /* The right way. The `pure' way. The one true way. This | |
397 | method depends solely on the register-unwind code to | |
398 | determine the value of registers in THIS frame, and hence | |
399 | the value of this frame's PC (resume address). A typical | |
400 | implementation is no more than: | |
401 | ||
402 | frame_unwind_register (this_frame, ISA_PC_REGNUM, buf); | |
af1342ab | 403 | return extract_unsigned_integer (buf, size of ISA_PC_REGNUM); |
12cc2063 AC |
404 | |
405 | Note: this method is very heavily dependent on a correct | |
406 | register-unwind implementation, it pays to fix that | |
407 | method first; this method is frame type agnostic, since | |
408 | it only deals with register values, it works with any | |
409 | frame. This is all in stark contrast to the old | |
410 | FRAME_SAVED_PC which would try to directly handle all the | |
411 | different ways that a PC could be unwound. */ | |
412 | pc = gdbarch_unwind_pc (current_gdbarch, this_frame); | |
413 | } | |
414 | else if (this_frame->level < 0) | |
415 | { | |
bbde78fa | 416 | /* FIXME: cagney/2003-03-06: Old code and a sentinel |
12cc2063 | 417 | frame. Do like was always done. Fetch the PC's value |
bbde78fa | 418 | directly from the global registers array (via read_pc). |
12cc2063 AC |
419 | This assumes that this frame belongs to the current |
420 | global register cache. The assumption is dangerous. */ | |
421 | pc = read_pc (); | |
422 | } | |
8bedc050 | 423 | else if (DEPRECATED_FRAME_SAVED_PC_P ()) |
12cc2063 AC |
424 | { |
425 | /* FIXME: cagney/2003-03-06: Old code, but not a sentinel | |
426 | frame. Do like was always done. Note that this method, | |
427 | unlike unwind_pc(), tries to handle all the different | |
428 | frame cases directly. It fails. */ | |
8bedc050 | 429 | pc = DEPRECATED_FRAME_SAVED_PC (this_frame); |
12cc2063 AC |
430 | } |
431 | else | |
432 | internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method"); | |
d1340264 AC |
433 | this_frame->prev_pc.value = pc; |
434 | this_frame->prev_pc.p = 1; | |
7f78e237 AC |
435 | if (frame_debug) |
436 | fprintf_unfiltered (gdb_stdlog, | |
437 | "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n", | |
438 | this_frame->level, | |
439 | paddr_nz (this_frame->prev_pc.value)); | |
f18c5a73 | 440 | } |
d1340264 | 441 | return this_frame->prev_pc.value; |
f18c5a73 AC |
442 | } |
443 | ||
be41e9f4 AC |
444 | CORE_ADDR |
445 | frame_func_unwind (struct frame_info *fi) | |
446 | { | |
447 | if (!fi->prev_func.p) | |
448 | { | |
57bfe177 AC |
449 | /* Make certain that this, and not the adjacent, function is |
450 | found. */ | |
451 | CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi); | |
be41e9f4 | 452 | fi->prev_func.p = 1; |
57bfe177 | 453 | fi->prev_func.addr = get_pc_function_start (addr_in_block); |
7f78e237 AC |
454 | if (frame_debug) |
455 | fprintf_unfiltered (gdb_stdlog, | |
456 | "{ frame_func_unwind (fi=%d) -> 0x%s }\n", | |
457 | fi->level, paddr_nz (fi->prev_func.addr)); | |
be41e9f4 AC |
458 | } |
459 | return fi->prev_func.addr; | |
460 | } | |
461 | ||
462 | CORE_ADDR | |
463 | get_frame_func (struct frame_info *fi) | |
464 | { | |
465 | return frame_func_unwind (fi->next); | |
466 | } | |
467 | ||
7a25a7c1 AC |
468 | static int |
469 | do_frame_unwind_register (void *src, int regnum, void *buf) | |
470 | { | |
471 | frame_unwind_register (src, regnum, buf); | |
472 | return 1; | |
473 | } | |
474 | ||
dbe9fe58 | 475 | void |
7a25a7c1 AC |
476 | frame_pop (struct frame_info *this_frame) |
477 | { | |
478 | struct regcache *scratch_regcache; | |
479 | struct cleanup *cleanups; | |
480 | ||
749b82f6 | 481 | if (DEPRECATED_POP_FRAME_P ()) |
7a25a7c1 AC |
482 | { |
483 | /* A legacy architecture that has implemented a custom pop | |
484 | function. All new architectures should instead be using the | |
485 | generic code below. */ | |
749b82f6 | 486 | DEPRECATED_POP_FRAME; |
7a25a7c1 AC |
487 | } |
488 | else | |
489 | { | |
490 | /* Make a copy of all the register values unwound from this | |
491 | frame. Save them in a scratch buffer so that there isn't a | |
bbde78fa JM |
492 | race between trying to extract the old values from the |
493 | current_regcache while at the same time writing new values | |
7a25a7c1 AC |
494 | into that same cache. */ |
495 | struct regcache *scratch = regcache_xmalloc (current_gdbarch); | |
496 | struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch); | |
497 | regcache_save (scratch, do_frame_unwind_register, this_frame); | |
efd710d6 AC |
498 | /* FIXME: cagney/2003-03-16: It should be possible to tell the |
499 | target's register cache that it is about to be hit with a | |
500 | burst register transfer and that the sequence of register | |
501 | writes should be batched. The pair target_prepare_to_store() | |
502 | and target_store_registers() kind of suggest this | |
ce2826aa | 503 | functionality. Unfortunately, they don't implement it. Their |
efd710d6 AC |
504 | lack of a formal definition can lead to targets writing back |
505 | bogus values (arguably a bug in the target code mind). */ | |
7a25a7c1 AC |
506 | /* Now copy those saved registers into the current regcache. |
507 | Here, regcache_cpy() calls regcache_restore(). */ | |
508 | regcache_cpy (current_regcache, scratch); | |
509 | do_cleanups (cleanups); | |
510 | } | |
511 | /* We've made right mess of GDB's local state, just discard | |
512 | everything. */ | |
dbe9fe58 AC |
513 | flush_cached_frames (); |
514 | } | |
c689142b | 515 | |
4f460812 AC |
516 | void |
517 | frame_register_unwind (struct frame_info *frame, int regnum, | |
518 | int *optimizedp, enum lval_type *lvalp, | |
519 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
520 | { | |
521 | struct frame_unwind_cache *cache; | |
522 | ||
7f78e237 AC |
523 | if (frame_debug) |
524 | { | |
6764ddad AC |
525 | fprintf_unfiltered (gdb_stdlog, "\ |
526 | { frame_register_unwind (frame=%d,regnum=%d(%s),...) ", | |
527 | frame->level, regnum, | |
528 | frame_map_regnum_to_name (frame, regnum)); | |
7f78e237 AC |
529 | } |
530 | ||
4f460812 AC |
531 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates |
532 | that the value proper does not need to be fetched. */ | |
533 | gdb_assert (optimizedp != NULL); | |
534 | gdb_assert (lvalp != NULL); | |
535 | gdb_assert (addrp != NULL); | |
536 | gdb_assert (realnump != NULL); | |
537 | /* gdb_assert (bufferp != NULL); */ | |
538 | ||
a94dd1fd AC |
539 | /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame |
540 | is broken. There is always a frame. If there, for some reason, | |
bbde78fa | 541 | isn't a frame, there is some pretty busted code as it should have |
a94dd1fd AC |
542 | detected the problem before calling here. */ |
543 | gdb_assert (frame != NULL); | |
4f460812 | 544 | |
c50901fd AC |
545 | /* Find the unwinder. */ |
546 | if (frame->unwind == NULL) | |
547 | { | |
82417da5 AC |
548 | frame->unwind = frame_unwind_find_by_frame (frame->next, |
549 | &frame->prologue_cache); | |
55699d59 AC |
550 | /* FIXME: cagney/2004-05-01: Should instead just use ->unwind->type. |
551 | Unfortunately, legacy_get_prev_frame is still explicitly setting | |
552 | the type. Eliminate that method and this field can be | |
553 | eliminated. */ | |
c50901fd AC |
554 | frame->type = frame->unwind->type; |
555 | } | |
556 | ||
6dc42492 | 557 | /* Ask this frame to unwind its register. See comment in |
bbde78fa | 558 | "frame-unwind.h" for why NEXT frame and this unwind cache are |
6dc42492 AC |
559 | passed in. */ |
560 | frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum, | |
561 | optimizedp, lvalp, addrp, realnump, bufferp); | |
562 | ||
7f78e237 AC |
563 | if (frame_debug) |
564 | { | |
565 | fprintf_unfiltered (gdb_stdlog, "->"); | |
566 | fprintf_unfiltered (gdb_stdlog, " *optimizedp=%d", (*optimizedp)); | |
567 | fprintf_unfiltered (gdb_stdlog, " *lvalp=%d", (int) (*lvalp)); | |
568 | fprintf_unfiltered (gdb_stdlog, " *addrp=0x%s", paddr_nz ((*addrp))); | |
569 | fprintf_unfiltered (gdb_stdlog, " *bufferp="); | |
570 | if (bufferp == NULL) | |
571 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
572 | else | |
573 | { | |
574 | int i; | |
d2cf594a | 575 | const unsigned char *buf = bufferp; |
7f78e237 AC |
576 | fprintf_unfiltered (gdb_stdlog, "["); |
577 | for (i = 0; i < register_size (current_gdbarch, regnum); i++) | |
578 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); | |
579 | fprintf_unfiltered (gdb_stdlog, "]"); | |
580 | } | |
581 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
582 | } | |
4f460812 AC |
583 | } |
584 | ||
a216a322 AC |
585 | void |
586 | frame_register (struct frame_info *frame, int regnum, | |
587 | int *optimizedp, enum lval_type *lvalp, | |
588 | CORE_ADDR *addrp, int *realnump, void *bufferp) | |
589 | { | |
590 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates | |
591 | that the value proper does not need to be fetched. */ | |
592 | gdb_assert (optimizedp != NULL); | |
593 | gdb_assert (lvalp != NULL); | |
594 | gdb_assert (addrp != NULL); | |
595 | gdb_assert (realnump != NULL); | |
596 | /* gdb_assert (bufferp != NULL); */ | |
597 | ||
598 | /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset | |
599 | of the register in the register cache. It should instead return | |
600 | the REGNUM corresponding to that register. Translate the . */ | |
129c1cd6 | 601 | if (DEPRECATED_GET_SAVED_REGISTER_P ()) |
a216a322 | 602 | { |
129c1cd6 AC |
603 | DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame, |
604 | regnum, lvalp); | |
a216a322 AC |
605 | /* Compute the REALNUM if the caller wants it. */ |
606 | if (*lvalp == lval_register) | |
607 | { | |
608 | int regnum; | |
609 | for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++) | |
610 | { | |
611 | if (*addrp == register_offset_hack (current_gdbarch, regnum)) | |
612 | { | |
613 | *realnump = regnum; | |
614 | return; | |
615 | } | |
616 | } | |
617 | internal_error (__FILE__, __LINE__, | |
618 | "Failed to compute the register number corresponding" | |
619 | " to 0x%s", paddr_d (*addrp)); | |
620 | } | |
621 | *realnump = -1; | |
622 | return; | |
623 | } | |
624 | ||
a94dd1fd AC |
625 | /* Obtain the register value by unwinding the register from the next |
626 | (more inner frame). */ | |
627 | gdb_assert (frame != NULL && frame->next != NULL); | |
628 | frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, | |
629 | realnump, bufferp); | |
a216a322 AC |
630 | } |
631 | ||
135c175f | 632 | void |
5b181d62 | 633 | frame_unwind_register (struct frame_info *frame, int regnum, void *buf) |
135c175f AC |
634 | { |
635 | int optimized; | |
636 | CORE_ADDR addr; | |
637 | int realnum; | |
638 | enum lval_type lval; | |
135c175f AC |
639 | frame_register_unwind (frame, regnum, &optimized, &lval, &addr, |
640 | &realnum, buf); | |
5b181d62 AC |
641 | } |
642 | ||
f0e7d0e8 AC |
643 | void |
644 | get_frame_register (struct frame_info *frame, | |
645 | int regnum, void *buf) | |
646 | { | |
647 | frame_unwind_register (frame->next, regnum, buf); | |
648 | } | |
649 | ||
650 | LONGEST | |
651 | frame_unwind_register_signed (struct frame_info *frame, int regnum) | |
652 | { | |
653 | char buf[MAX_REGISTER_SIZE]; | |
654 | frame_unwind_register (frame, regnum, buf); | |
f30992d4 | 655 | return extract_signed_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
f0e7d0e8 AC |
656 | } |
657 | ||
658 | LONGEST | |
659 | get_frame_register_signed (struct frame_info *frame, int regnum) | |
660 | { | |
661 | return frame_unwind_register_signed (frame->next, regnum); | |
662 | } | |
663 | ||
664 | ULONGEST | |
665 | frame_unwind_register_unsigned (struct frame_info *frame, int regnum) | |
666 | { | |
667 | char buf[MAX_REGISTER_SIZE]; | |
668 | frame_unwind_register (frame, regnum, buf); | |
f30992d4 | 669 | return extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
f0e7d0e8 AC |
670 | } |
671 | ||
672 | ULONGEST | |
673 | get_frame_register_unsigned (struct frame_info *frame, int regnum) | |
674 | { | |
675 | return frame_unwind_register_unsigned (frame->next, regnum); | |
676 | } | |
677 | ||
135c175f AC |
678 | void |
679 | frame_unwind_unsigned_register (struct frame_info *frame, int regnum, | |
680 | ULONGEST *val) | |
681 | { | |
d9d9c31f | 682 | char buf[MAX_REGISTER_SIZE]; |
5b181d62 | 683 | frame_unwind_register (frame, regnum, buf); |
f30992d4 | 684 | (*val) = extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum)); |
135c175f | 685 | } |
4f460812 | 686 | |
ff2e87ac AC |
687 | void |
688 | put_frame_register (struct frame_info *frame, int regnum, const void *buf) | |
689 | { | |
690 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
691 | int realnum; | |
692 | int optim; | |
693 | enum lval_type lval; | |
694 | CORE_ADDR addr; | |
695 | frame_register (frame, regnum, &optim, &lval, &addr, &realnum, NULL); | |
696 | if (optim) | |
697 | error ("Attempt to assign to a value that was optimized out."); | |
698 | switch (lval) | |
699 | { | |
700 | case lval_memory: | |
701 | { | |
702 | /* FIXME: write_memory doesn't yet take constant buffers. | |
703 | Arrrg! */ | |
704 | char tmp[MAX_REGISTER_SIZE]; | |
705 | memcpy (tmp, buf, register_size (gdbarch, regnum)); | |
706 | write_memory (addr, tmp, register_size (gdbarch, regnum)); | |
707 | break; | |
708 | } | |
709 | case lval_register: | |
710 | regcache_cooked_write (current_regcache, realnum, buf); | |
711 | break; | |
712 | default: | |
713 | error ("Attempt to assign to an unmodifiable value."); | |
714 | } | |
715 | } | |
716 | ||
cda5a58a | 717 | /* frame_register_read () |
d65fe839 | 718 | |
cda5a58a | 719 | Find and return the value of REGNUM for the specified stack frame. |
12c266ea AC |
720 | The number of bytes copied is DEPRECATED_REGISTER_RAW_SIZE |
721 | (REGNUM). | |
d65fe839 | 722 | |
cda5a58a | 723 | Returns 0 if the register value could not be found. */ |
d65fe839 | 724 | |
cda5a58a AC |
725 | int |
726 | frame_register_read (struct frame_info *frame, int regnum, void *myaddr) | |
d65fe839 | 727 | { |
a216a322 AC |
728 | int optimized; |
729 | enum lval_type lval; | |
730 | CORE_ADDR addr; | |
731 | int realnum; | |
732 | frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr); | |
d65fe839 | 733 | |
bbde78fa | 734 | /* FIXME: cagney/2002-05-15: This test is just bogus. |
c97dcfc7 AC |
735 | |
736 | It indicates that the target failed to supply a value for a | |
737 | register because it was "not available" at this time. Problem | |
738 | is, the target still has the register and so get saved_register() | |
739 | may be returning a value saved on the stack. */ | |
740 | ||
d65fe839 | 741 | if (register_cached (regnum) < 0) |
cda5a58a | 742 | return 0; /* register value not available */ |
d65fe839 | 743 | |
a216a322 | 744 | return !optimized; |
d65fe839 | 745 | } |
e36180d7 AC |
746 | |
747 | ||
748 | /* Map between a frame register number and its name. A frame register | |
749 | space is a superset of the cooked register space --- it also | |
750 | includes builtin registers. */ | |
751 | ||
752 | int | |
eb8bc282 | 753 | frame_map_name_to_regnum (struct frame_info *frame, const char *name, int len) |
e36180d7 | 754 | { |
eb8bc282 | 755 | return user_reg_map_name_to_regnum (get_frame_arch (frame), name, len); |
e36180d7 AC |
756 | } |
757 | ||
758 | const char * | |
eb8bc282 | 759 | frame_map_regnum_to_name (struct frame_info *frame, int regnum) |
e36180d7 | 760 | { |
eb8bc282 | 761 | return user_reg_map_regnum_to_name (get_frame_arch (frame), regnum); |
e36180d7 | 762 | } |
4c1e7e9d | 763 | |
a94dd1fd AC |
764 | /* Create a sentinel frame. */ |
765 | ||
b9362cc7 | 766 | static struct frame_info * |
a94dd1fd AC |
767 | create_sentinel_frame (struct regcache *regcache) |
768 | { | |
769 | struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
0e100dab | 770 | frame->type = SENTINEL_FRAME; |
a94dd1fd AC |
771 | frame->level = -1; |
772 | /* Explicitly initialize the sentinel frame's cache. Provide it | |
773 | with the underlying regcache. In the future additional | |
774 | information, such as the frame's thread will be added. */ | |
6dc42492 | 775 | frame->prologue_cache = sentinel_frame_cache (regcache); |
a94dd1fd AC |
776 | /* For the moment there is only one sentinel frame implementation. */ |
777 | frame->unwind = sentinel_frame_unwind; | |
778 | /* Link this frame back to itself. The frame is self referential | |
779 | (the unwound PC is the same as the pc), so make it so. */ | |
780 | frame->next = frame; | |
50bbdbd9 AC |
781 | /* Make the sentinel frame's ID valid, but invalid. That way all |
782 | comparisons with it should fail. */ | |
d0a55772 AC |
783 | frame->this_id.p = 1; |
784 | frame->this_id.value = null_frame_id; | |
7f78e237 AC |
785 | if (frame_debug) |
786 | { | |
787 | fprintf_unfiltered (gdb_stdlog, "{ create_sentinel_frame (...) -> "); | |
788 | fprint_frame (gdb_stdlog, frame); | |
789 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
790 | } | |
a94dd1fd AC |
791 | return frame; |
792 | } | |
793 | ||
4c1e7e9d AC |
794 | /* Info about the innermost stack frame (contents of FP register) */ |
795 | ||
796 | static struct frame_info *current_frame; | |
797 | ||
798 | /* Cache for frame addresses already read by gdb. Valid only while | |
799 | inferior is stopped. Control variables for the frame cache should | |
800 | be local to this module. */ | |
801 | ||
802 | static struct obstack frame_cache_obstack; | |
803 | ||
804 | void * | |
479ab5a0 | 805 | frame_obstack_zalloc (unsigned long size) |
4c1e7e9d | 806 | { |
479ab5a0 AC |
807 | void *data = obstack_alloc (&frame_cache_obstack, size); |
808 | memset (data, 0, size); | |
809 | return data; | |
4c1e7e9d AC |
810 | } |
811 | ||
6baff1d2 | 812 | CORE_ADDR * |
4c1e7e9d AC |
813 | frame_saved_regs_zalloc (struct frame_info *fi) |
814 | { | |
815 | fi->saved_regs = (CORE_ADDR *) | |
479ab5a0 | 816 | frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); |
6baff1d2 | 817 | return fi->saved_regs; |
4c1e7e9d AC |
818 | } |
819 | ||
6baff1d2 | 820 | CORE_ADDR * |
1b1d3794 | 821 | deprecated_get_frame_saved_regs (struct frame_info *fi) |
6baff1d2 AC |
822 | { |
823 | return fi->saved_regs; | |
824 | } | |
4c1e7e9d | 825 | |
a94dd1fd AC |
826 | /* Return the innermost (currently executing) stack frame. This is |
827 | split into two functions. The function unwind_to_current_frame() | |
828 | is wrapped in catch exceptions so that, even when the unwind of the | |
829 | sentinel frame fails, the function still returns a stack frame. */ | |
830 | ||
831 | static int | |
832 | unwind_to_current_frame (struct ui_out *ui_out, void *args) | |
833 | { | |
834 | struct frame_info *frame = get_prev_frame (args); | |
bbde78fa | 835 | /* A sentinel frame can fail to unwind, e.g., because its PC value |
a94dd1fd AC |
836 | lands in somewhere like start. */ |
837 | if (frame == NULL) | |
838 | return 1; | |
839 | current_frame = frame; | |
840 | return 0; | |
841 | } | |
4c1e7e9d AC |
842 | |
843 | struct frame_info * | |
844 | get_current_frame (void) | |
845 | { | |
0a1e1ca1 AC |
846 | /* First check, and report, the lack of registers. Having GDB |
847 | report "No stack!" or "No memory" when the target doesn't even | |
848 | have registers is very confusing. Besides, "printcmd.exp" | |
849 | explicitly checks that ``print $pc'' with no registers prints "No | |
850 | registers". */ | |
a94dd1fd AC |
851 | if (!target_has_registers) |
852 | error ("No registers."); | |
0a1e1ca1 AC |
853 | if (!target_has_stack) |
854 | error ("No stack."); | |
a94dd1fd AC |
855 | if (!target_has_memory) |
856 | error ("No memory."); | |
4c1e7e9d AC |
857 | if (current_frame == NULL) |
858 | { | |
a94dd1fd AC |
859 | struct frame_info *sentinel_frame = |
860 | create_sentinel_frame (current_regcache); | |
861 | if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame, | |
862 | NULL, RETURN_MASK_ERROR) != 0) | |
863 | { | |
864 | /* Oops! Fake a current frame? Is this useful? It has a PC | |
865 | of zero, for instance. */ | |
866 | current_frame = sentinel_frame; | |
867 | } | |
4c1e7e9d AC |
868 | } |
869 | return current_frame; | |
870 | } | |
871 | ||
6e7f8b9c AC |
872 | /* The "selected" stack frame is used by default for local and arg |
873 | access. May be zero, for no selected frame. */ | |
874 | ||
875 | struct frame_info *deprecated_selected_frame; | |
876 | ||
bbde78fa | 877 | /* Return the selected frame. Always non-NULL (unless there isn't an |
6e7f8b9c AC |
878 | inferior sufficient for creating a frame) in which case an error is |
879 | thrown. */ | |
880 | ||
881 | struct frame_info * | |
882 | get_selected_frame (void) | |
883 | { | |
884 | if (deprecated_selected_frame == NULL) | |
885 | /* Hey! Don't trust this. It should really be re-finding the | |
886 | last selected frame of the currently selected thread. This, | |
887 | though, is better than nothing. */ | |
888 | select_frame (get_current_frame ()); | |
889 | /* There is always a frame. */ | |
890 | gdb_assert (deprecated_selected_frame != NULL); | |
891 | return deprecated_selected_frame; | |
892 | } | |
893 | ||
bbde78fa | 894 | /* This is a variant of get_selected_frame() which can be called when |
7dd88986 | 895 | the inferior does not have a frame; in that case it will return |
bbde78fa | 896 | NULL instead of calling error(). */ |
7dd88986 DJ |
897 | |
898 | struct frame_info * | |
899 | deprecated_safe_get_selected_frame (void) | |
900 | { | |
901 | if (!target_has_registers || !target_has_stack || !target_has_memory) | |
902 | return NULL; | |
903 | return get_selected_frame (); | |
904 | } | |
905 | ||
6e7f8b9c AC |
906 | /* Select frame FI (or NULL - to invalidate the current frame). */ |
907 | ||
908 | void | |
909 | select_frame (struct frame_info *fi) | |
910 | { | |
52f0bd74 | 911 | struct symtab *s; |
6e7f8b9c AC |
912 | |
913 | deprecated_selected_frame = fi; | |
bbde78fa | 914 | /* NOTE: cagney/2002-05-04: FI can be NULL. This occurs when the |
6e7f8b9c | 915 | frame is being invalidated. */ |
9a4105ab AC |
916 | if (deprecated_selected_frame_level_changed_hook) |
917 | deprecated_selected_frame_level_changed_hook (frame_relative_level (fi)); | |
6e7f8b9c AC |
918 | |
919 | /* FIXME: kseitz/2002-08-28: It would be nice to call | |
bbde78fa | 920 | selected_frame_level_changed_event() right here, but due to limitations |
6e7f8b9c | 921 | in the current interfaces, we would end up flooding UIs with events |
bbde78fa | 922 | because select_frame() is used extensively internally. |
6e7f8b9c AC |
923 | |
924 | Once we have frame-parameterized frame (and frame-related) commands, | |
925 | the event notification can be moved here, since this function will only | |
bbde78fa | 926 | be called when the user's selected frame is being changed. */ |
6e7f8b9c AC |
927 | |
928 | /* Ensure that symbols for this frame are read in. Also, determine the | |
929 | source language of this frame, and switch to it if desired. */ | |
930 | if (fi) | |
931 | { | |
7ae4c3a5 | 932 | /* We retrieve the frame's symtab by using the frame PC. However |
bbde78fa | 933 | we cannot use the frame PC as-is, because it usually points to |
7ae4c3a5 JB |
934 | the instruction following the "call", which is sometimes the |
935 | first instruction of another function. So we rely on | |
936 | get_frame_address_in_block() which provides us with a PC which | |
937 | is guaranteed to be inside the frame's code block. */ | |
938 | s = find_pc_symtab (get_frame_address_in_block (fi)); | |
6e7f8b9c AC |
939 | if (s |
940 | && s->language != current_language->la_language | |
941 | && s->language != language_unknown | |
942 | && language_mode == language_mode_auto) | |
943 | { | |
944 | set_language (s->language); | |
945 | } | |
946 | } | |
947 | } | |
948 | ||
4c1e7e9d AC |
949 | /* Return the register saved in the simplistic ``saved_regs'' cache. |
950 | If the value isn't here AND a value is needed, try the next inner | |
951 | most frame. */ | |
952 | ||
953 | static void | |
6dc42492 AC |
954 | legacy_saved_regs_prev_register (struct frame_info *next_frame, |
955 | void **this_prologue_cache, | |
956 | int regnum, int *optimizedp, | |
957 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
958 | int *realnump, void *bufferp) | |
4c1e7e9d | 959 | { |
6dc42492 | 960 | /* HACK: New code is passed the next frame and this cache. |
ce2826aa | 961 | Unfortunately, old code expects this frame. Since this is a |
6dc42492 AC |
962 | backward compatibility hack, cheat by walking one level along the |
963 | prologue chain to the frame the old code expects. | |
964 | ||
965 | Do not try this at home. Professional driver, closed course. */ | |
966 | struct frame_info *frame = next_frame->prev; | |
4c1e7e9d | 967 | gdb_assert (frame != NULL); |
4c1e7e9d | 968 | |
1b1d3794 | 969 | if (deprecated_get_frame_saved_regs (frame) == NULL) |
870b3035 | 970 | { |
bbde78fa | 971 | /* If nothing has initialized the saved regs, do it now. */ |
870b3035 AC |
972 | gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()); |
973 | DEPRECATED_FRAME_INIT_SAVED_REGS (frame); | |
1b1d3794 | 974 | gdb_assert (deprecated_get_frame_saved_regs (frame) != NULL); |
870b3035 | 975 | } |
4c1e7e9d | 976 | |
1b1d3794 AC |
977 | if (deprecated_get_frame_saved_regs (frame) != NULL |
978 | && deprecated_get_frame_saved_regs (frame)[regnum] != 0) | |
4c1e7e9d AC |
979 | { |
980 | if (regnum == SP_REGNUM) | |
981 | { | |
982 | /* SP register treated specially. */ | |
983 | *optimizedp = 0; | |
984 | *lvalp = not_lval; | |
985 | *addrp = 0; | |
986 | *realnump = -1; | |
987 | if (bufferp != NULL) | |
bbde78fa JM |
988 | /* NOTE: cagney/2003-05-09: In-lined store_address() with |
989 | it's body - store_unsigned_integer(). */ | |
12c266ea | 990 | store_unsigned_integer (bufferp, DEPRECATED_REGISTER_RAW_SIZE (regnum), |
1b1d3794 | 991 | deprecated_get_frame_saved_regs (frame)[regnum]); |
4c1e7e9d AC |
992 | } |
993 | else | |
994 | { | |
995 | /* Any other register is saved in memory, fetch it but cache | |
996 | a local copy of its value. */ | |
997 | *optimizedp = 0; | |
998 | *lvalp = lval_memory; | |
1b1d3794 | 999 | *addrp = deprecated_get_frame_saved_regs (frame)[regnum]; |
4c1e7e9d AC |
1000 | *realnump = -1; |
1001 | if (bufferp != NULL) | |
1002 | { | |
1003 | #if 1 | |
1004 | /* Save each register value, as it is read in, in a | |
1005 | frame based cache. */ | |
6dc42492 | 1006 | void **regs = (*this_prologue_cache); |
4c1e7e9d AC |
1007 | if (regs == NULL) |
1008 | { | |
1009 | int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS) | |
1010 | * sizeof (void *)); | |
479ab5a0 | 1011 | regs = frame_obstack_zalloc (sizeof_cache); |
6dc42492 | 1012 | (*this_prologue_cache) = regs; |
4c1e7e9d AC |
1013 | } |
1014 | if (regs[regnum] == NULL) | |
1015 | { | |
1016 | regs[regnum] | |
12c266ea | 1017 | = frame_obstack_zalloc (DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
1b1d3794 | 1018 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], regs[regnum], |
12c266ea | 1019 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d | 1020 | } |
12c266ea | 1021 | memcpy (bufferp, regs[regnum], DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
1022 | #else |
1023 | /* Read the value in from memory. */ | |
1b1d3794 | 1024 | read_memory (deprecated_get_frame_saved_regs (frame)[regnum], bufferp, |
12c266ea | 1025 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
4c1e7e9d AC |
1026 | #endif |
1027 | } | |
1028 | } | |
1029 | return; | |
1030 | } | |
1031 | ||
6dc42492 AC |
1032 | /* No luck. Assume this and the next frame have the same register |
1033 | value. Pass the unwind request down the frame chain to the next | |
1034 | frame. Hopefully that frame will find the register's location. */ | |
1035 | frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp, | |
1036 | realnump, bufferp); | |
4c1e7e9d AC |
1037 | } |
1038 | ||
c170fb60 | 1039 | static void |
6dc42492 AC |
1040 | legacy_saved_regs_this_id (struct frame_info *next_frame, |
1041 | void **this_prologue_cache, | |
1042 | struct frame_id *id) | |
c689142b | 1043 | { |
1152e35e AC |
1044 | /* A developer is trying to bring up a new architecture, help them |
1045 | by providing a default unwinder that refuses to unwind anything | |
1046 | (the ID is always NULL). In the case of legacy code, | |
1047 | legacy_get_prev_frame() will have previously set ->this_id.p, so | |
1048 | this code won't be called. */ | |
1049 | (*id) = null_frame_id; | |
c689142b AC |
1050 | } |
1051 | ||
6dc42492 | 1052 | const struct frame_unwind legacy_saved_regs_unwinder = { |
bbde78fa | 1053 | /* Not really. It gets overridden by legacy_get_prev_frame(). */ |
7df05f2b | 1054 | UNKNOWN_FRAME, |
6dc42492 AC |
1055 | legacy_saved_regs_this_id, |
1056 | legacy_saved_regs_prev_register | |
494cca16 | 1057 | }; |
6dc42492 | 1058 | const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder; |
494cca16 | 1059 | |
eb4f72c5 AC |
1060 | /* Determine the frame's type based on its PC. */ |
1061 | ||
1062 | static enum frame_type | |
1063 | frame_type_from_pc (CORE_ADDR pc) | |
1064 | { | |
7a882905 AC |
1065 | /* NOTE: cagney/2004-05-08: Eliminating this function depends on all |
1066 | architectures being forced to use the frame-unwind code. */ | |
1067 | if (deprecated_pc_in_call_dummy (pc, 0, 0)) | |
eb4f72c5 AC |
1068 | return DUMMY_FRAME; |
1069 | else | |
ce12bbf9 | 1070 | return NORMAL_FRAME; |
eb4f72c5 AC |
1071 | } |
1072 | ||
4c1e7e9d AC |
1073 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. |
1074 | Always returns a non-NULL value. */ | |
1075 | ||
1076 | struct frame_info * | |
1077 | create_new_frame (CORE_ADDR addr, CORE_ADDR pc) | |
1078 | { | |
1079 | struct frame_info *fi; | |
4c1e7e9d | 1080 | |
7f78e237 AC |
1081 | if (frame_debug) |
1082 | { | |
1083 | fprintf_unfiltered (gdb_stdlog, | |
1084 | "{ create_new_frame (addr=0x%s, pc=0x%s) ", | |
1085 | paddr_nz (addr), paddr_nz (pc)); | |
1086 | } | |
1087 | ||
479ab5a0 | 1088 | fi = frame_obstack_zalloc (sizeof (struct frame_info)); |
4c1e7e9d | 1089 | |
a94dd1fd | 1090 | fi->next = create_sentinel_frame (current_regcache); |
7df05f2b AC |
1091 | |
1092 | /* Select/initialize both the unwind function and the frame's type | |
1093 | based on the PC. */ | |
82417da5 | 1094 | fi->unwind = frame_unwind_find_by_frame (fi->next, &fi->prologue_cache); |
7df05f2b AC |
1095 | if (fi->unwind->type != UNKNOWN_FRAME) |
1096 | fi->type = fi->unwind->type; | |
1097 | else | |
1098 | fi->type = frame_type_from_pc (pc); | |
1099 | ||
18adea3f | 1100 | fi->this_id.p = 1; |
11889732 AC |
1101 | deprecated_update_frame_base_hack (fi, addr); |
1102 | deprecated_update_frame_pc_hack (fi, pc); | |
4c1e7e9d | 1103 | |
e9582e71 AC |
1104 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1105 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi); | |
4c1e7e9d | 1106 | |
7f78e237 AC |
1107 | if (frame_debug) |
1108 | { | |
1109 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1110 | fprint_frame (gdb_stdlog, fi); | |
1111 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1112 | } | |
1113 | ||
4c1e7e9d AC |
1114 | return fi; |
1115 | } | |
1116 | ||
03febf99 AC |
1117 | /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the |
1118 | innermost frame). Be careful to not fall off the bottom of the | |
1119 | frame chain and onto the sentinel frame. */ | |
4c1e7e9d AC |
1120 | |
1121 | struct frame_info * | |
03febf99 | 1122 | get_next_frame (struct frame_info *this_frame) |
4c1e7e9d | 1123 | { |
03febf99 AC |
1124 | if (this_frame->level > 0) |
1125 | return this_frame->next; | |
a94dd1fd AC |
1126 | else |
1127 | return NULL; | |
4c1e7e9d AC |
1128 | } |
1129 | ||
f4c5303c OF |
1130 | /* Observer for the target_changed event. */ |
1131 | ||
1132 | void | |
1133 | frame_observer_target_changed (struct target_ops *target) | |
1134 | { | |
1135 | flush_cached_frames (); | |
1136 | } | |
1137 | ||
4c1e7e9d AC |
1138 | /* Flush the entire frame cache. */ |
1139 | ||
1140 | void | |
1141 | flush_cached_frames (void) | |
1142 | { | |
1143 | /* Since we can't really be sure what the first object allocated was */ | |
1144 | obstack_free (&frame_cache_obstack, 0); | |
1145 | obstack_init (&frame_cache_obstack); | |
1146 | ||
1147 | current_frame = NULL; /* Invalidate cache */ | |
1148 | select_frame (NULL); | |
1149 | annotate_frames_invalid (); | |
7f78e237 AC |
1150 | if (frame_debug) |
1151 | fprintf_unfiltered (gdb_stdlog, "{ flush_cached_frames () }\n"); | |
4c1e7e9d AC |
1152 | } |
1153 | ||
1154 | /* Flush the frame cache, and start a new one if necessary. */ | |
1155 | ||
1156 | void | |
1157 | reinit_frame_cache (void) | |
1158 | { | |
1159 | flush_cached_frames (); | |
1160 | ||
1161 | /* FIXME: The inferior_ptid test is wrong if there is a corefile. */ | |
1162 | if (PIDGET (inferior_ptid) != 0) | |
1163 | { | |
1164 | select_frame (get_current_frame ()); | |
1165 | } | |
1166 | } | |
1167 | ||
eb4f72c5 | 1168 | /* Create the previous frame using the deprecated methods |
08be3abd | 1169 | INIT_EXTRA_INFO, and INIT_FRAME_PC. */ |
4c1e7e9d | 1170 | |
eb4f72c5 | 1171 | static struct frame_info * |
03febf99 | 1172 | legacy_get_prev_frame (struct frame_info *this_frame) |
4c1e7e9d AC |
1173 | { |
1174 | CORE_ADDR address = 0; | |
1175 | struct frame_info *prev; | |
95adb866 | 1176 | int fromleaf; |
4c1e7e9d | 1177 | |
7f78e237 AC |
1178 | /* Don't frame_debug print legacy_get_prev_frame() here, just |
1179 | confuses the output. */ | |
1180 | ||
a01dd7cc | 1181 | /* Allocate the new frame. |
055bb976 AC |
1182 | |
1183 | There is no reason to worry about memory leaks, should the | |
1184 | remainder of the function fail. The allocated memory will be | |
1185 | quickly reclaimed when the frame cache is flushed, and the `we've | |
bbde78fa | 1186 | been here before' check, in get_prev_frame() will stop repeated |
055bb976 AC |
1187 | memory allocation calls. */ |
1188 | prev = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
1189 | prev->level = this_frame->level + 1; | |
1190 | ||
9564ee9f | 1191 | /* Do not completely wire it in to the frame chain. Some (bad) code |
a01dd7cc AC |
1192 | in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull |
1193 | some fancy tricks (of course such code is, by definition, | |
1194 | recursive). | |
1195 | ||
1196 | On the other hand, methods, such as get_frame_pc() and | |
1197 | get_frame_base() rely on being able to walk along the frame | |
1198 | chain. Make certain that at least they work by providing that | |
1199 | link. Of course things manipulating prev can't go back. */ | |
1200 | prev->next = this_frame; | |
1201 | ||
055bb976 AC |
1202 | /* NOTE: cagney/2002-11-18: Should have been correctly setting the |
1203 | frame's type here, before anything else, and not last, at the | |
1204 | bottom of this function. The various | |
08be3abd | 1205 | DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC, and |
055bb976 AC |
1206 | DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds |
1207 | that handle the frame not being correctly set from the start. | |
ce2826aa | 1208 | Unfortunately those same work-arounds rely on the type defaulting |
055bb976 AC |
1209 | to NORMAL_FRAME. Ulgh! The new frame code does not have this |
1210 | problem. */ | |
7df05f2b | 1211 | prev->type = UNKNOWN_FRAME; |
055bb976 | 1212 | |
06c77151 | 1213 | /* A legacy frame's ID is always computed here. Mark it as valid. */ |
d0a55772 | 1214 | prev->this_id.p = 1; |
06c77151 | 1215 | |
055bb976 AC |
1216 | /* Handle sentinel frame unwind as a special case. */ |
1217 | if (this_frame->level < 0) | |
1218 | { | |
1219 | /* Try to unwind the PC. If that doesn't work, assume we've reached | |
1220 | the oldest frame and simply return. Is there a better sentinal | |
1221 | value? The unwound PC value is then used to initialize the new | |
1222 | previous frame's type. | |
1223 | ||
1224 | Note that the pc-unwind is intentionally performed before the | |
1225 | frame chain. This is ok since, for old targets, both | |
bbde78fa | 1226 | frame_pc_unwind() (nee, DEPRECATED_FRAME_SAVED_PC) and |
618ce49f AC |
1227 | DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures |
1228 | have already been initialized (using | |
055bb976 AC |
1229 | DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order |
1230 | doesn't matter. | |
1231 | ||
1232 | By unwinding the PC first, it becomes possible to, in the case of | |
1233 | a dummy frame, avoid also unwinding the frame ID. This is | |
1234 | because (well ignoring the PPC) a dummy frame can be located | |
1235 | using THIS_FRAME's frame ID. */ | |
1236 | ||
11889732 AC |
1237 | deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame)); |
1238 | if (get_frame_pc (prev) == 0) | |
055bb976 AC |
1239 | { |
1240 | /* The allocated PREV_FRAME will be reclaimed when the frame | |
1241 | obstack is next purged. */ | |
1242 | if (frame_debug) | |
7f78e237 AC |
1243 | { |
1244 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1245 | fprint_frame (gdb_stdlog, NULL); | |
1246 | fprintf_unfiltered (gdb_stdlog, | |
1247 | " // unwound legacy PC zero }\n"); | |
1248 | } | |
055bb976 AC |
1249 | return NULL; |
1250 | } | |
055bb976 | 1251 | |
7df05f2b AC |
1252 | /* Set the unwind functions based on that identified PC. Ditto |
1253 | for the "type" but strongly prefer the unwinder's frame type. */ | |
82417da5 AC |
1254 | prev->unwind = frame_unwind_find_by_frame (prev->next, |
1255 | &prev->prologue_cache); | |
7df05f2b | 1256 | if (prev->unwind->type == UNKNOWN_FRAME) |
d1340264 | 1257 | prev->type = frame_type_from_pc (get_frame_pc (prev)); |
7df05f2b AC |
1258 | else |
1259 | prev->type = prev->unwind->type; | |
055bb976 AC |
1260 | |
1261 | /* Find the prev's frame's ID. */ | |
1262 | if (prev->type == DUMMY_FRAME | |
1263 | && gdbarch_unwind_dummy_id_p (current_gdbarch)) | |
1264 | { | |
1265 | /* When unwinding a normal frame, the stack structure is | |
1266 | determined by analyzing the frame's function's code (be | |
1267 | it using brute force prologue analysis, or the dwarf2 | |
1268 | CFI). In the case of a dummy frame, that simply isn't | |
1269 | possible. The The PC is either the program entry point, | |
1270 | or some random address on the stack. Trying to use that | |
1271 | PC to apply standard frame ID unwind techniques is just | |
1272 | asking for trouble. */ | |
055bb976 AC |
1273 | /* Use an architecture specific method to extract the prev's |
1274 | dummy ID from the next frame. Note that this method uses | |
1275 | frame_register_unwind to obtain the register values | |
1276 | needed to determine the dummy frame's ID. */ | |
d0a55772 AC |
1277 | prev->this_id.value = gdbarch_unwind_dummy_id (current_gdbarch, |
1278 | this_frame); | |
055bb976 AC |
1279 | } |
1280 | else | |
1281 | { | |
1282 | /* We're unwinding a sentinel frame, the PC of which is | |
1283 | pointing at a stack dummy. Fake up the dummy frame's ID | |
1284 | using the same sequence as is found a traditional | |
1285 | unwinder. Once all architectures supply the | |
1286 | unwind_dummy_id method, this code can go away. */ | |
0ba6dca9 AC |
1287 | prev->this_id.value = frame_id_build (deprecated_read_fp (), |
1288 | read_pc ()); | |
055bb976 AC |
1289 | } |
1290 | ||
1291 | /* Check that the unwound ID is valid. */ | |
d0a55772 | 1292 | if (!frame_id_p (prev->this_id.value)) |
055bb976 AC |
1293 | { |
1294 | if (frame_debug) | |
7f78e237 AC |
1295 | { |
1296 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1297 | fprint_frame (gdb_stdlog, NULL); | |
1298 | fprintf_unfiltered (gdb_stdlog, | |
1299 | " // unwound legacy ID invalid }\n"); | |
1300 | } | |
055bb976 AC |
1301 | return NULL; |
1302 | } | |
1303 | ||
1304 | /* Check that the new frame isn't inner to (younger, below, | |
1305 | next) the old frame. If that happens the frame unwind is | |
1306 | going backwards. */ | |
1307 | /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since | |
1308 | that doesn't have a valid frame ID. Should instead set the | |
1309 | sentinel frame's frame ID to a `sentinel'. Leave it until | |
1310 | after the switch to storing the frame ID, instead of the | |
1311 | frame base, in the frame object. */ | |
1312 | ||
055bb976 AC |
1313 | /* Link it in. */ |
1314 | this_frame->prev = prev; | |
055bb976 AC |
1315 | |
1316 | /* FIXME: cagney/2002-01-19: This call will go away. Instead of | |
1317 | initializing extra info, all frames will use the frame_cache | |
1318 | (passed to the unwind functions) to store additional frame | |
ce2826aa | 1319 | info. Unfortunately legacy targets can't use |
055bb976 AC |
1320 | legacy_get_prev_frame() to unwind the sentinel frame and, |
1321 | consequently, are forced to take this code path and rely on | |
1322 | the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to | |
1323 | initialize the inner-most frame. */ | |
1324 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) | |
1325 | { | |
1326 | DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev); | |
1327 | } | |
18adea3f AC |
1328 | |
1329 | if (prev->type == NORMAL_FRAME) | |
1330 | prev->this_id.value.code_addr | |
1331 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1332 | ||
7f78e237 AC |
1333 | if (frame_debug) |
1334 | { | |
1335 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1336 | fprint_frame (gdb_stdlog, prev); | |
1337 | fprintf_unfiltered (gdb_stdlog, " } // legacy innermost frame\n"); | |
1338 | } | |
055bb976 AC |
1339 | return prev; |
1340 | } | |
1341 | ||
eb4f72c5 AC |
1342 | /* This code only works on normal frames. A sentinel frame, where |
1343 | the level is -1, should never reach this code. */ | |
03febf99 | 1344 | gdb_assert (this_frame->level >= 0); |
4c1e7e9d AC |
1345 | |
1346 | /* On some machines it is possible to call a function without | |
1347 | setting up a stack frame for it. On these machines, we | |
1348 | define this macro to take two args; a frameinfo pointer | |
1349 | identifying a frame and a variable to set or clear if it is | |
1350 | or isn't leafless. */ | |
1351 | ||
1352 | /* Still don't want to worry about this except on the innermost | |
03febf99 | 1353 | frame. This macro will set FROMLEAF if THIS_FRAME is a frameless |
95adb866 | 1354 | function invocation. */ |
03febf99 | 1355 | if (this_frame->level == 0) |
bbde78fa | 1356 | /* FIXME: 2002-11-09: Frameless functions can occur anywhere in |
95adb866 AC |
1357 | the frame chain, not just the inner most frame! The generic, |
1358 | per-architecture, frame code should handle this and the below | |
1359 | should simply be removed. */ | |
19772a2c AC |
1360 | fromleaf = (DEPRECATED_FRAMELESS_FUNCTION_INVOCATION_P () |
1361 | && DEPRECATED_FRAMELESS_FUNCTION_INVOCATION (this_frame)); | |
95adb866 AC |
1362 | else |
1363 | fromleaf = 0; | |
1364 | ||
1365 | if (fromleaf) | |
1366 | /* A frameless inner-most frame. The `FP' (which isn't an | |
1367 | architecture frame-pointer register!) of the caller is the same | |
1368 | as the callee. */ | |
1369 | /* FIXME: 2002-11-09: There isn't any reason to special case this | |
bbde78fa | 1370 | edge condition. Instead the per-architecture code should handle |
95adb866 | 1371 | it locally. */ |
870b3035 AC |
1372 | /* FIXME: cagney/2003-06-16: This returns the inner most stack |
1373 | address for the previous frame, that, however, is wrong. It | |
1374 | should be the inner most stack address for the previous to | |
1375 | previous frame. This is because it is the previous to previous | |
1376 | frame's innermost stack address that is constant through out | |
1377 | the lifetime of the previous frame (trust me :-). */ | |
03febf99 | 1378 | address = get_frame_base (this_frame); |
95adb866 | 1379 | else |
4c1e7e9d AC |
1380 | { |
1381 | /* Two macros defined in tm.h specify the machine-dependent | |
1382 | actions to be performed here. | |
95adb866 | 1383 | |
4c1e7e9d | 1384 | First, get the frame's chain-pointer. |
95adb866 | 1385 | |
4c1e7e9d AC |
1386 | If that is zero, the frame is the outermost frame or a leaf |
1387 | called by the outermost frame. This means that if start | |
1388 | calls main without a frame, we'll return 0 (which is fine | |
1389 | anyway). | |
1390 | ||
1391 | Nope; there's a problem. This also returns when the current | |
1392 | routine is a leaf of main. This is unacceptable. We move | |
1393 | this to after the ffi test; I'd rather have backtraces from | |
1394 | start go curfluy than have an abort called from main not show | |
1395 | main. */ | |
870b3035 AC |
1396 | if (DEPRECATED_FRAME_CHAIN_P ()) |
1397 | address = DEPRECATED_FRAME_CHAIN (this_frame); | |
1398 | else | |
1399 | { | |
1400 | /* Someone is part way through coverting an old architecture | |
1401 | to the new frame code. Implement FRAME_CHAIN the way the | |
1402 | new frame will. */ | |
1403 | /* Find PREV frame's unwinder. */ | |
82417da5 AC |
1404 | prev->unwind = frame_unwind_find_by_frame (this_frame, |
1405 | &prev->prologue_cache); | |
55699d59 AC |
1406 | /* FIXME: cagney/2004-05-01: Should instead just use |
1407 | ->unwind->type. Unfortunately, legacy_get_prev_frame is | |
1408 | still explicitly setting the type. Eliminate that method | |
1409 | and this field can be eliminated. */ | |
870b3035 AC |
1410 | prev->type = prev->unwind->type; |
1411 | /* Find PREV frame's ID. */ | |
1412 | prev->unwind->this_id (this_frame, | |
1413 | &prev->prologue_cache, | |
1414 | &prev->this_id.value); | |
1415 | prev->this_id.p = 1; | |
1416 | address = prev->this_id.value.stack_addr; | |
1417 | } | |
4c1e7e9d | 1418 | |
e6ba3bc9 | 1419 | if (!legacy_frame_chain_valid (address, this_frame)) |
7f78e237 AC |
1420 | { |
1421 | if (frame_debug) | |
1422 | { | |
1423 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1424 | fprint_frame (gdb_stdlog, NULL); | |
1425 | fprintf_unfiltered (gdb_stdlog, | |
1426 | " // legacy frame chain invalid }\n"); | |
1427 | } | |
1428 | return NULL; | |
1429 | } | |
4c1e7e9d AC |
1430 | } |
1431 | if (address == 0) | |
7f78e237 AC |
1432 | { |
1433 | if (frame_debug) | |
1434 | { | |
1435 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1436 | fprint_frame (gdb_stdlog, NULL); | |
1437 | fprintf_unfiltered (gdb_stdlog, | |
1438 | " // legacy frame chain NULL }\n"); | |
1439 | } | |
1440 | return NULL; | |
1441 | } | |
4c1e7e9d | 1442 | |
055bb976 | 1443 | /* Link in the already allocated prev frame. */ |
03febf99 | 1444 | this_frame->prev = prev; |
11889732 | 1445 | deprecated_update_frame_base_hack (prev, address); |
4c1e7e9d | 1446 | |
95adb866 | 1447 | /* This change should not be needed, FIXME! We should determine |
a5afb99f | 1448 | whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen |
e9582e71 AC |
1449 | after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple |
1450 | way to express what goes on here. | |
95adb866 | 1451 | |
e9582e71 AC |
1452 | DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places: |
1453 | create_new_frame (where the PC is already set up) and here (where | |
1454 | it isn't). DEPRECATED_INIT_FRAME_PC is only called from here, | |
1455 | always after DEPRECATED_INIT_EXTRA_FRAME_INFO. | |
95adb866 | 1456 | |
e9582e71 AC |
1457 | The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO |
1458 | requires the PC value (which hasn't been set yet). Some other | |
1459 | machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO | |
1460 | before they can do DEPRECATED_INIT_FRAME_PC. Phoo. | |
95adb866 | 1461 | |
a5afb99f | 1462 | Assuming that some machines need DEPRECATED_INIT_FRAME_PC after |
e9582e71 | 1463 | DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme: |
95adb866 AC |
1464 | |
1465 | SETUP_INNERMOST_FRAME(): Default version is just create_new_frame | |
0ba6dca9 AC |
1466 | (deprecated_read_fp ()), read_pc ()). Machines with extra frame |
1467 | info would do that (or the local equivalent) and then set the | |
1468 | extra fields. | |
95adb866 AC |
1469 | |
1470 | SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that | |
1471 | create_new_frame would no longer init extra frame info; | |
1472 | SETUP_ARBITRARY_FRAME would have to do that. | |
1473 | ||
e9582e71 AC |
1474 | INIT_PREV_FRAME(fromleaf, prev) Replace |
1475 | DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC. | |
1476 | This should also return a flag saying whether to keep the new | |
1477 | frame, or whether to discard it, because on some machines (e.g. | |
618ce49f AC |
1478 | mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID |
1479 | called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good | |
1480 | way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID | |
1481 | into the extra fields of the new frame). std_frame_pc(fromleaf, | |
1482 | prev) | |
95adb866 AC |
1483 | |
1484 | This is the default setting for INIT_PREV_FRAME. It just does | |
a5afb99f AC |
1485 | what the default DEPRECATED_INIT_FRAME_PC does. Some machines |
1486 | will call it from INIT_PREV_FRAME (either at the beginning, the | |
1487 | end, or in the middle). Some machines won't use it. | |
95adb866 AC |
1488 | |
1489 | kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */ | |
1490 | ||
1491 | /* NOTE: cagney/2002-11-09: Just ignore the above! There is no | |
1492 | reason for things to be this complicated. | |
1493 | ||
1494 | The trick is to assume that there is always a frame. Instead of | |
bbde78fa | 1495 | special casing the inner-most frame, create a fake frame |
95adb866 AC |
1496 | (containing the hardware registers) that is inner to the |
1497 | user-visible inner-most frame (...) and then unwind from that. | |
bbde78fa | 1498 | That way architecture code can use the standard |
95adb866 AC |
1499 | frame_XX_unwind() functions and not differentiate between the |
1500 | inner most and any other case. | |
1501 | ||
1502 | Since there is always a frame to unwind from, there is always | |
03febf99 | 1503 | somewhere (THIS_FRAME) to store all the info needed to construct |
95adb866 AC |
1504 | a new (previous) frame without having to first create it. This |
1505 | means that the convolution below - needing to carefully order a | |
1506 | frame's initialization - isn't needed. | |
1507 | ||
618ce49f AC |
1508 | The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least |
1509 | for a more up-to-date architecture, always calls | |
1510 | FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but | |
1511 | without first needing the frame! Instead of the convolution | |
1512 | below, we could have simply called FRAME_SAVED_PC() and been done | |
bbde78fa | 1513 | with it! Note that FRAME_SAVED_PC() is being superseded by |
618ce49f AC |
1514 | frame_pc_unwind() and that function does have somewhere to cache |
1515 | that PC value. */ | |
4c1e7e9d | 1516 | |
e9582e71 AC |
1517 | if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()) |
1518 | DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev); | |
4c1e7e9d AC |
1519 | |
1520 | /* This entry is in the frame queue now, which is good since | |
95adb866 | 1521 | FRAME_SAVED_PC may use that queue to figure out its value (see |
bbde78fa | 1522 | tm-sparc.h). We want the PC saved in the inferior frame. */ |
a5afb99f | 1523 | if (DEPRECATED_INIT_FRAME_PC_P ()) |
11889732 AC |
1524 | deprecated_update_frame_pc_hack (prev, |
1525 | DEPRECATED_INIT_FRAME_PC (fromleaf, | |
1526 | prev)); | |
4c1e7e9d | 1527 | |
95adb866 AC |
1528 | /* If ->frame and ->pc are unchanged, we are in the process of |
1529 | getting ourselves into an infinite backtrace. Some architectures | |
618ce49f AC |
1530 | check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems |
1531 | like there is no reason this can't be an architecture-independent | |
1532 | check. */ | |
11889732 AC |
1533 | if (get_frame_base (prev) == get_frame_base (this_frame) |
1534 | && get_frame_pc (prev) == get_frame_pc (this_frame)) | |
4c1e7e9d | 1535 | { |
03febf99 | 1536 | this_frame->prev = NULL; |
95adb866 | 1537 | obstack_free (&frame_cache_obstack, prev); |
7f78e237 AC |
1538 | if (frame_debug) |
1539 | { | |
1540 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1541 | fprint_frame (gdb_stdlog, NULL); | |
1542 | fprintf_unfiltered (gdb_stdlog, | |
1543 | " // legacy this.id == prev.id }\n"); | |
1544 | } | |
95adb866 | 1545 | return NULL; |
4c1e7e9d AC |
1546 | } |
1547 | ||
1548 | /* Initialize the code used to unwind the frame PREV based on the PC | |
1549 | (and probably other architectural information). The PC lets you | |
1550 | check things like the debug info at that point (dwarf2cfi?) and | |
870b3035 AC |
1551 | use that to decide how the frame should be unwound. |
1552 | ||
1553 | If there isn't a FRAME_CHAIN, the code above will have already | |
1554 | done this. */ | |
1555 | if (prev->unwind == NULL) | |
82417da5 AC |
1556 | prev->unwind = frame_unwind_find_by_frame (prev->next, |
1557 | &prev->prologue_cache); | |
4c1e7e9d | 1558 | |
bbde78fa | 1559 | /* If the unwinder provides a frame type, use it. Otherwise |
7df05f2b AC |
1560 | continue on to that heuristic mess. */ |
1561 | if (prev->unwind->type != UNKNOWN_FRAME) | |
1562 | { | |
1563 | prev->type = prev->unwind->type; | |
18adea3f | 1564 | if (prev->type == NORMAL_FRAME) |
870b3035 | 1565 | /* FIXME: cagney/2003-06-16: would get_frame_pc() be better? */ |
18adea3f AC |
1566 | prev->this_id.value.code_addr |
1567 | = get_pc_function_start (prev->this_id.value.code_addr); | |
7f78e237 AC |
1568 | if (frame_debug) |
1569 | { | |
1570 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1571 | fprint_frame (gdb_stdlog, prev); | |
1572 | fprintf_unfiltered (gdb_stdlog, " } // legacy with unwound type\n"); | |
1573 | } | |
7df05f2b AC |
1574 | return prev; |
1575 | } | |
1576 | ||
5a203e44 | 1577 | /* NOTE: cagney/2002-11-18: The code segments, found in |
bbde78fa JM |
1578 | create_new_frame() and get_prev_frame(), that initialize the |
1579 | frame's type is subtly different. The latter only updates ->type | |
5a203e44 AC |
1580 | when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops |
1581 | get_prev_frame() overriding the frame's type when the INIT code | |
1582 | has previously set it. This is really somewhat bogus. The | |
1583 | initialization, as seen in create_new_frame(), should occur | |
1584 | before the INIT function has been called. */ | |
7a882905 | 1585 | if (deprecated_pc_in_call_dummy (get_frame_pc (prev), 0, 0)) |
5a203e44 | 1586 | prev->type = DUMMY_FRAME; |
4c1e7e9d | 1587 | |
18adea3f AC |
1588 | if (prev->type == NORMAL_FRAME) |
1589 | prev->this_id.value.code_addr | |
1590 | = get_pc_function_start (prev->this_id.value.code_addr); | |
1591 | ||
7f78e237 AC |
1592 | if (frame_debug) |
1593 | { | |
1594 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1595 | fprint_frame (gdb_stdlog, prev); | |
1596 | fprintf_unfiltered (gdb_stdlog, " } // legacy with confused type\n"); | |
1597 | } | |
1598 | ||
4c1e7e9d AC |
1599 | return prev; |
1600 | } | |
1601 | ||
5613d8d3 AC |
1602 | /* Return a "struct frame_info" corresponding to the frame that called |
1603 | THIS_FRAME. Returns NULL if there is no such frame. | |
5bf00f29 | 1604 | |
5613d8d3 AC |
1605 | Unlike get_prev_frame, this function always tries to unwind the |
1606 | frame. */ | |
eb4f72c5 | 1607 | |
5613d8d3 AC |
1608 | static struct frame_info * |
1609 | get_prev_frame_1 (struct frame_info *this_frame) | |
eb4f72c5 AC |
1610 | { |
1611 | struct frame_info *prev_frame; | |
756e95f1 | 1612 | struct frame_id this_id; |
eb4f72c5 | 1613 | |
5613d8d3 AC |
1614 | gdb_assert (this_frame != NULL); |
1615 | ||
7f78e237 AC |
1616 | if (frame_debug) |
1617 | { | |
5613d8d3 | 1618 | fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame_1 (this_frame="); |
7f78e237 AC |
1619 | if (this_frame != NULL) |
1620 | fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level); | |
1621 | else | |
1622 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
1623 | fprintf_unfiltered (gdb_stdlog, ") "); | |
1624 | } | |
1625 | ||
5613d8d3 AC |
1626 | /* Only try to do the unwind once. */ |
1627 | if (this_frame->prev_p) | |
1628 | { | |
1629 | if (frame_debug) | |
1630 | { | |
1631 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1632 | fprint_frame (gdb_stdlog, this_frame->prev); | |
1633 | fprintf_unfiltered (gdb_stdlog, " // cached \n"); | |
1634 | } | |
1635 | return this_frame->prev; | |
1636 | } | |
1637 | this_frame->prev_p = 1; | |
1638 | ||
1639 | /* If any of the old frame initialization methods are around, use | |
bbde78fa | 1640 | the legacy get_prev_frame() method. */ |
5613d8d3 AC |
1641 | if (legacy_frame_p (current_gdbarch)) |
1642 | { | |
1643 | prev_frame = legacy_get_prev_frame (this_frame); | |
1644 | return prev_frame; | |
1645 | } | |
1646 | ||
1647 | /* Check that this frame's ID was valid. If it wasn't, don't try to | |
1648 | unwind to the prev frame. Be careful to not apply this test to | |
1649 | the sentinel frame. */ | |
756e95f1 MK |
1650 | this_id = get_frame_id (this_frame); |
1651 | if (this_frame->level >= 0 && !frame_id_p (this_id)) | |
5613d8d3 AC |
1652 | { |
1653 | if (frame_debug) | |
1654 | { | |
1655 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1656 | fprint_frame (gdb_stdlog, NULL); | |
1657 | fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n"); | |
1658 | } | |
1659 | return NULL; | |
1660 | } | |
1661 | ||
1662 | /* Check that this frame's ID isn't inner to (younger, below, next) | |
1663 | the next frame. This happens when a frame unwind goes backwards. | |
adb54772 AC |
1664 | Exclude signal trampolines (due to sigaltstack the frame ID can |
1665 | go backwards) and sentinel frames (the test is meaningless). */ | |
1666 | if (this_frame->next->level >= 0 | |
1667 | && this_frame->next->type != SIGTRAMP_FRAME | |
756e95f1 | 1668 | && frame_id_inner (this_id, get_frame_id (this_frame->next))) |
5613d8d3 AC |
1669 | error ("Previous frame inner to this frame (corrupt stack?)"); |
1670 | ||
1671 | /* Check that this and the next frame are not identical. If they | |
1672 | are, there is most likely a stack cycle. As with the inner-than | |
1673 | test above, avoid comparing the inner-most and sentinel frames. */ | |
1674 | if (this_frame->level > 0 | |
756e95f1 | 1675 | && frame_id_eq (this_id, get_frame_id (this_frame->next))) |
5613d8d3 AC |
1676 | error ("Previous frame identical to this frame (corrupt stack?)"); |
1677 | ||
1678 | /* Allocate the new frame but do not wire it in to the frame chain. | |
1679 | Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along | |
1680 | frame->next to pull some fancy tricks (of course such code is, by | |
1681 | definition, recursive). Try to prevent it. | |
1682 | ||
1683 | There is no reason to worry about memory leaks, should the | |
1684 | remainder of the function fail. The allocated memory will be | |
1685 | quickly reclaimed when the frame cache is flushed, and the `we've | |
1686 | been here before' check above will stop repeated memory | |
1687 | allocation calls. */ | |
1688 | prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
1689 | prev_frame->level = this_frame->level + 1; | |
1690 | ||
1691 | /* Don't yet compute ->unwind (and hence ->type). It is computed | |
1692 | on-demand in get_frame_type, frame_register_unwind, and | |
1693 | get_frame_id. */ | |
1694 | ||
1695 | /* Don't yet compute the frame's ID. It is computed on-demand by | |
1696 | get_frame_id(). */ | |
1697 | ||
1698 | /* The unwound frame ID is validate at the start of this function, | |
1699 | as part of the logic to decide if that frame should be further | |
1700 | unwound, and not here while the prev frame is being created. | |
1701 | Doing this makes it possible for the user to examine a frame that | |
1702 | has an invalid frame ID. | |
1703 | ||
1704 | Some very old VAX code noted: [...] For the sake of argument, | |
1705 | suppose that the stack is somewhat trashed (which is one reason | |
1706 | that "info frame" exists). So, return 0 (indicating we don't | |
1707 | know the address of the arglist) if we don't know what frame this | |
1708 | frame calls. */ | |
1709 | ||
1710 | /* Link it in. */ | |
1711 | this_frame->prev = prev_frame; | |
1712 | prev_frame->next = this_frame; | |
1713 | ||
1714 | if (frame_debug) | |
1715 | { | |
1716 | fprintf_unfiltered (gdb_stdlog, "-> "); | |
1717 | fprint_frame (gdb_stdlog, prev_frame); | |
1718 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
1719 | } | |
1720 | ||
1721 | return prev_frame; | |
1722 | } | |
1723 | ||
1724 | /* Debug routine to print a NULL frame being returned. */ | |
1725 | ||
1726 | static void | |
1727 | frame_debug_got_null_frame (struct ui_file *file, | |
1728 | struct frame_info *this_frame, | |
1729 | const char *reason) | |
1730 | { | |
1731 | if (frame_debug) | |
1732 | { | |
1733 | fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame="); | |
1734 | if (this_frame != NULL) | |
1735 | fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level); | |
1736 | else | |
1737 | fprintf_unfiltered (gdb_stdlog, "<NULL>"); | |
1738 | fprintf_unfiltered (gdb_stdlog, ") -> // %s}\n", reason); | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | /* Return a structure containing various interesting information about | |
1743 | the frame that called THIS_FRAME. Returns NULL if there is entier | |
1744 | no such frame or the frame fails any of a set of target-independent | |
1745 | condition that should terminate the frame chain (e.g., as unwinding | |
1746 | past main()). | |
1747 | ||
1748 | This function should not contain target-dependent tests, such as | |
1749 | checking whether the program-counter is zero. */ | |
1750 | ||
1751 | struct frame_info * | |
1752 | get_prev_frame (struct frame_info *this_frame) | |
1753 | { | |
1754 | struct frame_info *prev_frame; | |
1755 | ||
eb4f72c5 AC |
1756 | /* Return the inner-most frame, when the caller passes in NULL. */ |
1757 | /* NOTE: cagney/2002-11-09: Not sure how this would happen. The | |
1758 | caller should have previously obtained a valid frame using | |
1759 | get_selected_frame() and then called this code - only possibility | |
1760 | I can think of is code behaving badly. | |
1761 | ||
1762 | NOTE: cagney/2003-01-10: Talk about code behaving badly. Check | |
1763 | block_innermost_frame(). It does the sequence: frame = NULL; | |
1764 | while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why | |
1765 | it couldn't be written better, I don't know. | |
1766 | ||
bbde78fa | 1767 | NOTE: cagney/2003-01-11: I suspect what is happening in |
eb4f72c5 | 1768 | block_innermost_frame() is, when the target has no state |
bbde78fa | 1769 | (registers, memory, ...), it is still calling this function. The |
eb4f72c5 AC |
1770 | assumption being that this function will return NULL indicating |
1771 | that a frame isn't possible, rather than checking that the target | |
1772 | has state and then calling get_current_frame() and | |
1773 | get_prev_frame(). This is a guess mind. */ | |
03febf99 | 1774 | if (this_frame == NULL) |
eb4f72c5 AC |
1775 | { |
1776 | /* NOTE: cagney/2002-11-09: There was a code segment here that | |
1777 | would error out when CURRENT_FRAME was NULL. The comment | |
1778 | that went with it made the claim ... | |
1779 | ||
1780 | ``This screws value_of_variable, which just wants a nice | |
1781 | clean NULL return from block_innermost_frame if there are no | |
1782 | frames. I don't think I've ever seen this message happen | |
1783 | otherwise. And returning NULL here is a perfectly legitimate | |
1784 | thing to do.'' | |
1785 | ||
1786 | Per the above, this code shouldn't even be called with a NULL | |
03febf99 | 1787 | THIS_FRAME. */ |
5613d8d3 | 1788 | frame_debug_got_null_frame (gdb_stdlog, this_frame, "this_frame NULL"); |
eb4f72c5 AC |
1789 | return current_frame; |
1790 | } | |
1791 | ||
1792 | /* There is always a frame. If this assertion fails, suspect that | |
1793 | something should be calling get_selected_frame() or | |
1794 | get_current_frame(). */ | |
03febf99 | 1795 | gdb_assert (this_frame != NULL); |
eb4f72c5 | 1796 | |
3f1d7f16 | 1797 | /* Make sure we pass an address within THIS_FRAME's code block to |
bbde78fa | 1798 | inside_main_func(). Otherwise, we might stop unwinding at a |
3f1d7f16 MK |
1799 | function which has a call instruction as its last instruction if |
1800 | that function immediately precedes main(). */ | |
03febf99 | 1801 | if (this_frame->level >= 0 |
25d29d70 | 1802 | && !backtrace_past_main |
3f1d7f16 | 1803 | && inside_main_func (get_frame_address_in_block (this_frame))) |
bbde78fa | 1804 | /* Don't unwind past main(), but always unwind the sentinel frame. |
eb4f72c5 AC |
1805 | Note, this is done _before_ the frame has been marked as |
1806 | previously unwound. That way if the user later decides to | |
1807 | allow unwinds past main(), that just happens. */ | |
ac2bd0a9 | 1808 | { |
5613d8d3 | 1809 | frame_debug_got_null_frame (gdb_stdlog, this_frame, "inside main func"); |
ac2bd0a9 AC |
1810 | return NULL; |
1811 | } | |
eb4f72c5 | 1812 | |
25d29d70 AC |
1813 | if (this_frame->level > backtrace_limit) |
1814 | { | |
1815 | error ("Backtrace limit of %d exceeded", backtrace_limit); | |
1816 | } | |
1817 | ||
0714963c AC |
1818 | /* If we're already inside the entry function for the main objfile, |
1819 | then it isn't valid. Don't apply this test to a dummy frame - | |
bbde78fa | 1820 | dummy frame PCs typically land in the entry func. Don't apply |
0714963c AC |
1821 | this test to the sentinel frame. Sentinel frames should always |
1822 | be allowed to unwind. */ | |
1823 | /* NOTE: cagney/2003-02-25: Don't enable until someone has found | |
1824 | hard evidence that this is needed. */ | |
2f72f850 AC |
1825 | /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func() - |
1826 | wasn't checking for "main" in the minimal symbols. With that | |
1827 | fixed asm-source tests now stop in "main" instead of halting the | |
bbde78fa | 1828 | backtrace in weird and wonderful ways somewhere inside the entry |
2f72f850 AC |
1829 | file. Suspect that tests for inside the entry file/func were |
1830 | added to work around that (now fixed) case. */ | |
0714963c AC |
1831 | /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right) |
1832 | suggested having the inside_entry_func test use the | |
bbde78fa JM |
1833 | inside_main_func() msymbol trick (along with entry_point_address() |
1834 | I guess) to determine the address range of the start function. | |
0714963c AC |
1835 | That should provide a far better stopper than the current |
1836 | heuristics. */ | |
1837 | /* NOTE: cagney/2003-07-15: Need to add a "set backtrace | |
1838 | beyond-entry-func" command so that this can be selectively | |
1839 | disabled. */ | |
1840 | if (0 | |
1841 | #if 0 | |
1842 | && backtrace_beyond_entry_func | |
1843 | #endif | |
1844 | && this_frame->type != DUMMY_FRAME && this_frame->level >= 0 | |
6e4c6c91 | 1845 | && inside_entry_func (this_frame)) |
0714963c | 1846 | { |
5613d8d3 | 1847 | frame_debug_got_null_frame (gdb_stdlog, this_frame, "inside entry func"); |
0714963c AC |
1848 | return NULL; |
1849 | } | |
1850 | ||
5613d8d3 | 1851 | return get_prev_frame_1 (this_frame); |
eb4f72c5 AC |
1852 | } |
1853 | ||
4c1e7e9d AC |
1854 | CORE_ADDR |
1855 | get_frame_pc (struct frame_info *frame) | |
1856 | { | |
d1340264 AC |
1857 | gdb_assert (frame->next != NULL); |
1858 | return frame_pc_unwind (frame->next); | |
4c1e7e9d AC |
1859 | } |
1860 | ||
8edd5d01 AC |
1861 | /* Return an address of that falls within the frame's code block. */ |
1862 | ||
1863 | CORE_ADDR | |
1864 | frame_unwind_address_in_block (struct frame_info *next_frame) | |
1865 | { | |
1866 | /* A draft address. */ | |
1867 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
1868 | ||
1869 | /* If THIS frame is not inner most (i.e., NEXT isn't the sentinel), | |
1870 | and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS | |
1871 | frame's PC ends up pointing at the instruction fallowing the | |
1872 | "call". Adjust that PC value so that it falls on the call | |
1873 | instruction (which, hopefully, falls within THIS frame's code | |
1874 | block. So far it's proved to be a very good approximation. See | |
bbde78fa | 1875 | get_frame_type() for why ->type can't be used. */ |
8edd5d01 AC |
1876 | if (next_frame->level >= 0 |
1877 | && get_frame_type (next_frame) == NORMAL_FRAME) | |
1878 | --pc; | |
1879 | return pc; | |
1880 | } | |
1881 | ||
1882 | CORE_ADDR | |
1883 | get_frame_address_in_block (struct frame_info *this_frame) | |
1884 | { | |
1885 | return frame_unwind_address_in_block (this_frame->next); | |
1886 | } | |
1887 | ||
1058bca7 AC |
1888 | static int |
1889 | pc_notcurrent (struct frame_info *frame) | |
1890 | { | |
1891 | /* If FRAME is not the innermost frame, that normally means that | |
1892 | FRAME->pc points at the return instruction (which is *after* the | |
1893 | call instruction), and we want to get the line containing the | |
1894 | call (because the call is where the user thinks the program is). | |
1895 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
1896 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
1897 | PC and such a PC indicates the current (rather than next) | |
1898 | instruction/line, consequently, for such cases, want to get the | |
1899 | line containing fi->pc. */ | |
1900 | struct frame_info *next = get_next_frame (frame); | |
1901 | int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME); | |
1902 | return notcurrent; | |
1903 | } | |
1904 | ||
1905 | void | |
1906 | find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal) | |
1907 | { | |
11889732 | 1908 | (*sal) = find_pc_line (get_frame_pc (frame), pc_notcurrent (frame)); |
1058bca7 AC |
1909 | } |
1910 | ||
c193f6ac AC |
1911 | /* Per "frame.h", return the ``address'' of the frame. Code should |
1912 | really be using get_frame_id(). */ | |
1913 | CORE_ADDR | |
1914 | get_frame_base (struct frame_info *fi) | |
1915 | { | |
d0a55772 | 1916 | return get_frame_id (fi).stack_addr; |
c193f6ac AC |
1917 | } |
1918 | ||
da62e633 AC |
1919 | /* High-level offsets into the frame. Used by the debug info. */ |
1920 | ||
1921 | CORE_ADDR | |
1922 | get_frame_base_address (struct frame_info *fi) | |
1923 | { | |
7df05f2b | 1924 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
1925 | return 0; |
1926 | if (fi->base == NULL) | |
e8a89fe2 | 1927 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
1928 | /* Sneaky: If the low-level unwind and high-level base code share a |
1929 | common unwinder, let them share the prologue cache. */ | |
1930 | if (fi->base->unwind == fi->unwind) | |
1931 | return fi->base->this_base (fi->next, &fi->prologue_cache); | |
1932 | return fi->base->this_base (fi->next, &fi->base_cache); | |
1933 | } | |
1934 | ||
1935 | CORE_ADDR | |
1936 | get_frame_locals_address (struct frame_info *fi) | |
1937 | { | |
1938 | void **cache; | |
7df05f2b | 1939 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
1940 | return 0; |
1941 | /* If there isn't a frame address method, find it. */ | |
1942 | if (fi->base == NULL) | |
e8a89fe2 | 1943 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
1944 | /* Sneaky: If the low-level unwind and high-level base code share a |
1945 | common unwinder, let them share the prologue cache. */ | |
1946 | if (fi->base->unwind == fi->unwind) | |
1947 | cache = &fi->prologue_cache; | |
1948 | else | |
1949 | cache = &fi->base_cache; | |
1950 | return fi->base->this_locals (fi->next, cache); | |
1951 | } | |
1952 | ||
1953 | CORE_ADDR | |
1954 | get_frame_args_address (struct frame_info *fi) | |
1955 | { | |
1956 | void **cache; | |
7df05f2b | 1957 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
1958 | return 0; |
1959 | /* If there isn't a frame address method, find it. */ | |
1960 | if (fi->base == NULL) | |
e8a89fe2 | 1961 | fi->base = frame_base_find_by_frame (fi->next); |
da62e633 AC |
1962 | /* Sneaky: If the low-level unwind and high-level base code share a |
1963 | common unwinder, let them share the prologue cache. */ | |
1964 | if (fi->base->unwind == fi->unwind) | |
1965 | cache = &fi->prologue_cache; | |
1966 | else | |
1967 | cache = &fi->base_cache; | |
1968 | return fi->base->this_args (fi->next, cache); | |
1969 | } | |
1970 | ||
85cf597a AC |
1971 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
1972 | or -1 for a NULL frame. */ | |
1973 | ||
1974 | int | |
1975 | frame_relative_level (struct frame_info *fi) | |
1976 | { | |
1977 | if (fi == NULL) | |
1978 | return -1; | |
1979 | else | |
1980 | return fi->level; | |
1981 | } | |
1982 | ||
5a203e44 AC |
1983 | enum frame_type |
1984 | get_frame_type (struct frame_info *frame) | |
1985 | { | |
710ee10a KB |
1986 | /* Some legacy code, e.g, mips_init_extra_frame_info() wants |
1987 | to determine the frame's type prior to it being completely | |
1988 | initialized. Don't attempt to lazily initialize ->unwind for | |
1989 | legacy code. It will be initialized in legacy_get_prev_frame(). */ | |
1990 | if (frame->unwind == NULL && !legacy_frame_p (current_gdbarch)) | |
c50901fd | 1991 | { |
bbde78fa | 1992 | /* Initialize the frame's unwinder because that's what |
c50901fd | 1993 | provides the frame's type. */ |
82417da5 AC |
1994 | frame->unwind = frame_unwind_find_by_frame (frame->next, |
1995 | &frame->prologue_cache); | |
55699d59 AC |
1996 | /* FIXME: cagney/2004-05-01: Should instead just use |
1997 | ->unwind->type. Unfortunately, legacy_get_prev_frame is | |
1998 | still explicitly setting the type. Eliminate that method and | |
1999 | this field can be eliminated. */ | |
c50901fd AC |
2000 | frame->type = frame->unwind->type; |
2001 | } | |
7df05f2b AC |
2002 | if (frame->type == UNKNOWN_FRAME) |
2003 | return NORMAL_FRAME; | |
2004 | else | |
2005 | return frame->type; | |
5a203e44 AC |
2006 | } |
2007 | ||
0394eb2a AC |
2008 | struct frame_extra_info * |
2009 | get_frame_extra_info (struct frame_info *fi) | |
2010 | { | |
2011 | return fi->extra_info; | |
2012 | } | |
2013 | ||
2c517d0e AC |
2014 | struct frame_extra_info * |
2015 | frame_extra_info_zalloc (struct frame_info *fi, long size) | |
2016 | { | |
479ab5a0 | 2017 | fi->extra_info = frame_obstack_zalloc (size); |
2c517d0e AC |
2018 | return fi->extra_info; |
2019 | } | |
2020 | ||
b87efeee | 2021 | void |
2f107107 | 2022 | deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc) |
b87efeee | 2023 | { |
7f78e237 AC |
2024 | if (frame_debug) |
2025 | fprintf_unfiltered (gdb_stdlog, | |
2026 | "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n", | |
2027 | frame->level, paddr_nz (pc)); | |
e0d2ae16 | 2028 | /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are |
bbde78fa | 2029 | maintaining a locally allocated frame object. Since such frames |
e0d2ae16 AC |
2030 | are not in the frame chain, it isn't possible to assume that the |
2031 | frame has a next. Sigh. */ | |
2032 | if (frame->next != NULL) | |
2033 | { | |
2034 | /* While we're at it, update this frame's cached PC value, found | |
2035 | in the next frame. Oh for the day when "struct frame_info" | |
2036 | is opaque and this hack on hack can just go away. */ | |
d1340264 AC |
2037 | frame->next->prev_pc.value = pc; |
2038 | frame->next->prev_pc.p = 1; | |
e0d2ae16 | 2039 | } |
2f107107 AC |
2040 | } |
2041 | ||
2042 | void | |
2043 | deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base) | |
2044 | { | |
7f78e237 AC |
2045 | if (frame_debug) |
2046 | fprintf_unfiltered (gdb_stdlog, | |
2047 | "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n", | |
2048 | frame->level, paddr_nz (base)); | |
2f107107 | 2049 | /* See comment in "frame.h". */ |
d0a55772 | 2050 | frame->this_id.value.stack_addr = base; |
b87efeee AC |
2051 | } |
2052 | ||
c8b8a898 | 2053 | struct frame_info * |
213cc0ad AC |
2054 | deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs, |
2055 | long sizeof_extra_info) | |
c8b8a898 | 2056 | { |
bcf7d3ca AC |
2057 | struct frame_info *frame = XMALLOC (struct frame_info); |
2058 | memset (frame, 0, sizeof (*frame)); | |
18adea3f | 2059 | frame->this_id.p = 1; |
f6c609c4 AC |
2060 | make_cleanup (xfree, frame); |
2061 | if (sizeof_saved_regs > 0) | |
2062 | { | |
2063 | frame->saved_regs = xcalloc (1, sizeof_saved_regs); | |
2064 | make_cleanup (xfree, frame->saved_regs); | |
2065 | } | |
2066 | if (sizeof_extra_info > 0) | |
2067 | { | |
2068 | frame->extra_info = xcalloc (1, sizeof_extra_info); | |
2069 | make_cleanup (xfree, frame->extra_info); | |
2070 | } | |
2071 | return frame; | |
2072 | } | |
c8b8a898 | 2073 | |
ae1e7417 AC |
2074 | /* Memory access methods. */ |
2075 | ||
2076 | void | |
2077 | get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, void *buf, | |
2078 | int len) | |
2079 | { | |
2080 | read_memory (addr, buf, len); | |
2081 | } | |
2082 | ||
2083 | LONGEST | |
2084 | get_frame_memory_signed (struct frame_info *this_frame, CORE_ADDR addr, | |
2085 | int len) | |
2086 | { | |
2087 | return read_memory_integer (addr, len); | |
2088 | } | |
2089 | ||
2090 | ULONGEST | |
2091 | get_frame_memory_unsigned (struct frame_info *this_frame, CORE_ADDR addr, | |
2092 | int len) | |
2093 | { | |
2094 | return read_memory_unsigned_integer (addr, len); | |
2095 | } | |
2096 | ||
304396fb AC |
2097 | int |
2098 | safe_frame_unwind_memory (struct frame_info *this_frame, | |
2099 | CORE_ADDR addr, void *buf, int len) | |
2100 | { | |
2101 | /* NOTE: read_memory_nobpt returns zero on success! */ | |
2102 | return !read_memory_nobpt (addr, buf, len); | |
2103 | } | |
2104 | ||
ae1e7417 AC |
2105 | /* Architecture method. */ |
2106 | ||
2107 | struct gdbarch * | |
2108 | get_frame_arch (struct frame_info *this_frame) | |
2109 | { | |
2110 | return current_gdbarch; | |
2111 | } | |
2112 | ||
a9e5fdc2 AC |
2113 | /* Stack pointer methods. */ |
2114 | ||
2115 | CORE_ADDR | |
2116 | get_frame_sp (struct frame_info *this_frame) | |
2117 | { | |
2118 | return frame_sp_unwind (this_frame->next); | |
2119 | } | |
2120 | ||
2121 | CORE_ADDR | |
2122 | frame_sp_unwind (struct frame_info *next_frame) | |
2123 | { | |
bbde78fa | 2124 | /* Normality - an architecture that provides a way of obtaining any |
a9e5fdc2 AC |
2125 | frame inner-most address. */ |
2126 | if (gdbarch_unwind_sp_p (current_gdbarch)) | |
2127 | return gdbarch_unwind_sp (current_gdbarch, next_frame); | |
2128 | /* Things are looking grim. If it's the inner-most frame and there | |
bbde78fa | 2129 | is a TARGET_READ_SP, then that can be used. */ |
a9e5fdc2 AC |
2130 | if (next_frame->level < 0 && TARGET_READ_SP_P ()) |
2131 | return TARGET_READ_SP (); | |
2132 | /* Now things are really are grim. Hope that the value returned by | |
2133 | the SP_REGNUM register is meaningful. */ | |
2134 | if (SP_REGNUM >= 0) | |
2135 | { | |
2136 | ULONGEST sp; | |
2137 | frame_unwind_unsigned_register (next_frame, SP_REGNUM, &sp); | |
2138 | return sp; | |
2139 | } | |
2140 | internal_error (__FILE__, __LINE__, "Missing unwind SP method"); | |
2141 | } | |
2142 | ||
2143 | ||
1594fa56 AC |
2144 | int |
2145 | legacy_frame_p (struct gdbarch *current_gdbarch) | |
2146 | { | |
31b75dbf | 2147 | if (DEPRECATED_INIT_FRAME_PC_P () |
31b75dbf AC |
2148 | || DEPRECATED_INIT_EXTRA_FRAME_INFO_P () |
2149 | || DEPRECATED_FRAME_CHAIN_P ()) | |
2150 | /* No question, it's a legacy frame. */ | |
2151 | return 1; | |
2152 | if (gdbarch_unwind_dummy_id_p (current_gdbarch)) | |
2153 | /* No question, it's not a legacy frame (provided none of the | |
2154 | deprecated methods checked above are present that is). */ | |
2155 | return 0; | |
2156 | if (DEPRECATED_TARGET_READ_FP_P () | |
2157 | || DEPRECATED_FP_REGNUM >= 0) | |
2158 | /* Assume it's legacy. If you're trying to convert a legacy frame | |
2159 | target to the new mechanism, get rid of these. legacy | |
bbde78fa | 2160 | get_prev_frame() requires these when unwind_frame_id() isn't |
31b75dbf AC |
2161 | available. */ |
2162 | return 1; | |
2163 | /* Default to assuming that it's brand new code, and hence not | |
2164 | legacy. Force it down the non-legacy path so that the new code | |
bbde78fa | 2165 | uses the new frame mechanism from day one. Dummy frames won't |
31b75dbf AC |
2166 | work very well but we can live with that. */ |
2167 | return 0; | |
1594fa56 AC |
2168 | } |
2169 | ||
b9362cc7 AC |
2170 | extern initialize_file_ftype _initialize_frame; /* -Wmissing-prototypes */ |
2171 | ||
25d29d70 AC |
2172 | static struct cmd_list_element *set_backtrace_cmdlist; |
2173 | static struct cmd_list_element *show_backtrace_cmdlist; | |
2174 | ||
2175 | static void | |
2176 | set_backtrace_cmd (char *args, int from_tty) | |
2177 | { | |
2178 | help_list (set_backtrace_cmdlist, "set backtrace ", -1, gdb_stdout); | |
2179 | } | |
2180 | ||
2181 | static void | |
2182 | show_backtrace_cmd (char *args, int from_tty) | |
2183 | { | |
2184 | cmd_show_list (show_backtrace_cmdlist, from_tty, ""); | |
2185 | } | |
2186 | ||
4c1e7e9d AC |
2187 | void |
2188 | _initialize_frame (void) | |
2189 | { | |
2190 | obstack_init (&frame_cache_obstack); | |
eb4f72c5 | 2191 | |
f4c5303c OF |
2192 | observer_attach_target_changed (frame_observer_target_changed); |
2193 | ||
25d29d70 AC |
2194 | add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, "\ |
2195 | Set backtrace specific variables.\n\ | |
2196 | Configure backtrace variables such as the backtrace limit", | |
2197 | &set_backtrace_cmdlist, "set backtrace ", | |
2198 | 0/*allow-unknown*/, &setlist); | |
2199 | add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, "\ | |
2200 | Show backtrace specific variables\n\ | |
2201 | Show backtrace variables such as the backtrace limit", | |
2202 | &show_backtrace_cmdlist, "show backtrace ", | |
2203 | 0/*allow-unknown*/, &showlist); | |
2204 | ||
2205 | add_setshow_boolean_cmd ("past-main", class_obscure, | |
2206 | &backtrace_past_main, "\ | |
eb4f72c5 AC |
2207 | Set whether backtraces should continue past \"main\".\n\ |
2208 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2209 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2210 | of the stack trace.", "\ | |
2211 | Show whether backtraces should continue past \"main\".\n\ | |
2212 | Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
2213 | the backtrace at \"main\". Set this variable if you need to see the rest\n\ | |
2214 | of the stack trace.", | |
25d29d70 AC |
2215 | NULL, NULL, &set_backtrace_cmdlist, |
2216 | &show_backtrace_cmdlist); | |
2217 | ||
2218 | add_setshow_uinteger_cmd ("limit", class_obscure, | |
2219 | &backtrace_limit, "\ | |
2220 | Set an upper bound on the number of backtrace levels.\n\ | |
fec74868 | 2221 | No more than the specified number of frames can be displayed or examined.\n\ |
25d29d70 AC |
2222 | Zero is unlimited.", "\ |
2223 | Show the upper bound on the number of backtrace levels.", | |
2224 | NULL, NULL, &set_backtrace_cmdlist, | |
2225 | &show_backtrace_cmdlist); | |
ac2bd0a9 AC |
2226 | |
2227 | /* Debug this files internals. */ | |
2228 | add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger, | |
2229 | &frame_debug, "Set frame debugging.\n\ | |
2230 | When non-zero, frame specific internal debugging is enabled.", &setdebuglist), | |
2231 | &showdebuglist); | |
4c1e7e9d | 2232 | } |