Commit | Line | Data |
---|---|---|
7cc19214 AC |
1 | /* Get info from stack frames; convert between frames, blocks, |
2 | functions and pc values. | |
3 | ||
4 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
51603483 | 5 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software |
7cc19214 | 6 | Foundation, Inc. |
c906108c | 7 | |
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b JM |
20 | You should have received a copy of the GNU General Public License |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "symtab.h" | |
27 | #include "bfd.h" | |
28 | #include "symfile.h" | |
29 | #include "objfiles.h" | |
30 | #include "frame.h" | |
31 | #include "gdbcore.h" | |
32 | #include "value.h" /* for read_register */ | |
33 | #include "target.h" /* for target_has_stack */ | |
34 | #include "inferior.h" /* for read_pc */ | |
35 | #include "annotate.h" | |
4e052eda | 36 | #include "regcache.h" |
4f460812 | 37 | #include "gdb_assert.h" |
9c1412c1 | 38 | #include "dummy-frame.h" |
51603483 DJ |
39 | #include "command.h" |
40 | #include "gdbcmd.h" | |
fe898f56 | 41 | #include "block.h" |
c906108c | 42 | |
51603483 | 43 | /* Prototypes for exported functions. */ |
c5aa993b | 44 | |
51603483 | 45 | void _initialize_blockframe (void); |
c906108c | 46 | |
618ce49f AC |
47 | /* Is ADDR inside the startup file? Note that if your machine has a |
48 | way to detect the bottom of the stack, there is no need to call | |
49 | this function from DEPRECATED_FRAME_CHAIN_VALID; the reason for | |
50 | doing so is that some machines have no way of detecting bottom of | |
51 | stack. | |
c906108c SS |
52 | |
53 | A PC of zero is always considered to be the bottom of the stack. */ | |
54 | ||
55 | int | |
fba45db2 | 56 | inside_entry_file (CORE_ADDR addr) |
c906108c SS |
57 | { |
58 | if (addr == 0) | |
59 | return 1; | |
60 | if (symfile_objfile == 0) | |
61 | return 0; | |
7a292a7a SS |
62 | if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT) |
63 | { | |
64 | /* Do not stop backtracing if the pc is in the call dummy | |
c5aa993b | 65 | at the entry point. */ |
7a292a7a | 66 | /* FIXME: Won't always work with zeros for the last two arguments */ |
ae45cd16 | 67 | if (DEPRECATED_PC_IN_CALL_DUMMY (addr, 0, 0)) |
7a292a7a SS |
68 | return 0; |
69 | } | |
c5aa993b JM |
70 | return (addr >= symfile_objfile->ei.entry_file_lowpc && |
71 | addr < symfile_objfile->ei.entry_file_highpc); | |
c906108c SS |
72 | } |
73 | ||
74 | /* Test a specified PC value to see if it is in the range of addresses | |
75 | that correspond to the main() function. See comments above for why | |
76 | we might want to do this. | |
77 | ||
618ce49f | 78 | Typically called from DEPRECATED_FRAME_CHAIN_VALID. |
c906108c SS |
79 | |
80 | A PC of zero is always considered to be the bottom of the stack. */ | |
81 | ||
82 | int | |
fba45db2 | 83 | inside_main_func (CORE_ADDR pc) |
c906108c SS |
84 | { |
85 | if (pc == 0) | |
86 | return 1; | |
87 | if (symfile_objfile == 0) | |
88 | return 0; | |
89 | ||
618ce49f AC |
90 | /* If the addr range is not set up at symbol reading time, set it up |
91 | now. This is for DEPRECATED_FRAME_CHAIN_VALID_ALTERNATE. I do | |
92 | this for coff, because it is unable to set it up and symbol | |
93 | reading time. */ | |
c906108c | 94 | |
c5aa993b JM |
95 | if (symfile_objfile->ei.main_func_lowpc == INVALID_ENTRY_LOWPC && |
96 | symfile_objfile->ei.main_func_highpc == INVALID_ENTRY_HIGHPC) | |
c906108c SS |
97 | { |
98 | struct symbol *mainsym; | |
99 | ||
176620f1 | 100 | mainsym = lookup_symbol (main_name (), NULL, VAR_DOMAIN, NULL, NULL); |
c5aa993b JM |
101 | if (mainsym && SYMBOL_CLASS (mainsym) == LOC_BLOCK) |
102 | { | |
103 | symfile_objfile->ei.main_func_lowpc = | |
c906108c | 104 | BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym)); |
c5aa993b | 105 | symfile_objfile->ei.main_func_highpc = |
c906108c | 106 | BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym)); |
c5aa993b | 107 | } |
c906108c | 108 | } |
0714963c AC |
109 | |
110 | /* Not in the normal symbol tables, see if "main" is in the partial | |
111 | symbol table. If it's not, then give up. */ | |
112 | { | |
113 | struct minimal_symbol *msymbol | |
114 | = lookup_minimal_symbol (main_name (), NULL, symfile_objfile); | |
115 | if (msymbol != NULL && MSYMBOL_TYPE (msymbol) == mst_text) | |
116 | { | |
117 | struct obj_section *osect | |
118 | = find_pc_sect_section (SYMBOL_VALUE_ADDRESS (msymbol), | |
119 | msymbol->ginfo.bfd_section); | |
120 | if (osect != NULL) | |
121 | { | |
122 | int i; | |
123 | /* Step over other symbols at this same address, and | |
124 | symbols in other sections, to find the next symbol in | |
125 | this section with a different address. */ | |
126 | for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++) | |
127 | { | |
128 | if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol) | |
129 | && SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol)) | |
130 | break; | |
131 | } | |
132 | ||
133 | symfile_objfile->ei.main_func_lowpc = SYMBOL_VALUE_ADDRESS (msymbol); | |
134 | ||
135 | /* Use the lesser of the next minimal symbol in the same | |
136 | section, or the end of the section, as the end of the | |
137 | function. */ | |
138 | if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL | |
139 | && SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr) | |
140 | symfile_objfile->ei.main_func_highpc = SYMBOL_VALUE_ADDRESS (msymbol + i); | |
141 | else | |
142 | /* We got the start address from the last msymbol in the | |
143 | objfile. So the end address is the end of the | |
144 | section. */ | |
145 | symfile_objfile->ei.main_func_highpc = osect->endaddr; | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
c5aa993b JM |
150 | return (symfile_objfile->ei.main_func_lowpc <= pc && |
151 | symfile_objfile->ei.main_func_highpc > pc); | |
c906108c SS |
152 | } |
153 | ||
154 | /* Test a specified PC value to see if it is in the range of addresses | |
155 | that correspond to the process entry point function. See comments | |
156 | in objfiles.h for why we might want to do this. | |
157 | ||
618ce49f | 158 | Typically called from DEPRECATED_FRAME_CHAIN_VALID. |
c906108c SS |
159 | |
160 | A PC of zero is always considered to be the bottom of the stack. */ | |
161 | ||
162 | int | |
fba45db2 | 163 | inside_entry_func (CORE_ADDR pc) |
c906108c SS |
164 | { |
165 | if (pc == 0) | |
166 | return 1; | |
167 | if (symfile_objfile == 0) | |
168 | return 0; | |
7a292a7a SS |
169 | if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT) |
170 | { | |
171 | /* Do not stop backtracing if the pc is in the call dummy | |
c5aa993b | 172 | at the entry point. */ |
7a292a7a | 173 | /* FIXME: Won't always work with zeros for the last two arguments */ |
ae45cd16 | 174 | if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) |
7a292a7a SS |
175 | return 0; |
176 | } | |
c5aa993b JM |
177 | return (symfile_objfile->ei.entry_func_lowpc <= pc && |
178 | symfile_objfile->ei.entry_func_highpc > pc); | |
c906108c SS |
179 | } |
180 | ||
c906108c SS |
181 | /* Return nonzero if the function for this frame lacks a prologue. Many |
182 | machines can define FRAMELESS_FUNCTION_INVOCATION to just call this | |
183 | function. */ | |
184 | ||
185 | int | |
fba45db2 | 186 | frameless_look_for_prologue (struct frame_info *frame) |
c906108c | 187 | { |
e76c5fcc | 188 | CORE_ADDR func_start; |
53a5351d | 189 | |
be41e9f4 | 190 | func_start = get_frame_func (frame); |
c906108c SS |
191 | if (func_start) |
192 | { | |
193 | func_start += FUNCTION_START_OFFSET; | |
53a5351d JM |
194 | /* This is faster, since only care whether there *is* a |
195 | prologue, not how long it is. */ | |
dad41f9a | 196 | return PROLOGUE_FRAMELESS_P (func_start); |
c906108c | 197 | } |
bdd78e62 | 198 | else if (get_frame_pc (frame) == 0) |
53a5351d JM |
199 | /* A frame with a zero PC is usually created by dereferencing a |
200 | NULL function pointer, normally causing an immediate core dump | |
201 | of the inferior. Mark function as frameless, as the inferior | |
202 | has no chance of setting up a stack frame. */ | |
c906108c SS |
203 | return 1; |
204 | else | |
205 | /* If we can't find the start of the function, we don't really | |
206 | know whether the function is frameless, but we should be able | |
207 | to get a reasonable (i.e. best we can do under the | |
208 | circumstances) backtrace by saying that it isn't. */ | |
209 | return 0; | |
210 | } | |
211 | ||
c906108c | 212 | /* Return the innermost lexical block in execution |
ae767bfb JB |
213 | in a specified stack frame. The frame address is assumed valid. |
214 | ||
215 | If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code | |
216 | address we used to choose the block. We use this to find a source | |
217 | line, to decide which macro definitions are in scope. | |
218 | ||
219 | The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's | |
220 | PC, and may not really be a valid PC at all. For example, in the | |
221 | caller of a function declared to never return, the code at the | |
222 | return address will never be reached, so the call instruction may | |
223 | be the very last instruction in the block. So the address we use | |
224 | to choose the block is actually one byte before the return address | |
225 | --- hopefully pointing us at the call instruction, or its delay | |
226 | slot instruction. */ | |
c906108c SS |
227 | |
228 | struct block * | |
ae767bfb | 229 | get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block) |
c906108c | 230 | { |
c4a09524 | 231 | const CORE_ADDR pc = get_frame_address_in_block (frame); |
ae767bfb JB |
232 | |
233 | if (addr_in_block) | |
234 | *addr_in_block = pc; | |
235 | ||
c906108c SS |
236 | return block_for_pc (pc); |
237 | } | |
238 | ||
c906108c | 239 | CORE_ADDR |
fba45db2 | 240 | get_pc_function_start (CORE_ADDR pc) |
c906108c | 241 | { |
2cdd89cb MK |
242 | struct block *bl; |
243 | struct minimal_symbol *msymbol; | |
c906108c | 244 | |
2cdd89cb MK |
245 | bl = block_for_pc (pc); |
246 | if (bl) | |
c906108c | 247 | { |
2cdd89cb MK |
248 | struct symbol *symbol = block_function (bl); |
249 | ||
250 | if (symbol) | |
251 | { | |
252 | bl = SYMBOL_BLOCK_VALUE (symbol); | |
253 | return BLOCK_START (bl); | |
254 | } | |
c906108c | 255 | } |
2cdd89cb MK |
256 | |
257 | msymbol = lookup_minimal_symbol_by_pc (pc); | |
258 | if (msymbol) | |
c906108c | 259 | { |
2cdd89cb MK |
260 | CORE_ADDR fstart = SYMBOL_VALUE_ADDRESS (msymbol); |
261 | ||
262 | if (find_pc_section (fstart)) | |
263 | return fstart; | |
c906108c | 264 | } |
2cdd89cb MK |
265 | |
266 | return 0; | |
c906108c SS |
267 | } |
268 | ||
269 | /* Return the symbol for the function executing in frame FRAME. */ | |
270 | ||
271 | struct symbol * | |
fba45db2 | 272 | get_frame_function (struct frame_info *frame) |
c906108c | 273 | { |
ae767bfb | 274 | register struct block *bl = get_frame_block (frame, 0); |
c906108c SS |
275 | if (bl == 0) |
276 | return 0; | |
277 | return block_function (bl); | |
278 | } | |
279 | \f | |
280 | ||
c906108c SS |
281 | /* Return the function containing pc value PC in section SECTION. |
282 | Returns 0 if function is not known. */ | |
283 | ||
284 | struct symbol * | |
fba45db2 | 285 | find_pc_sect_function (CORE_ADDR pc, struct sec *section) |
c906108c SS |
286 | { |
287 | register struct block *b = block_for_pc_sect (pc, section); | |
288 | if (b == 0) | |
289 | return 0; | |
290 | return block_function (b); | |
291 | } | |
292 | ||
293 | /* Return the function containing pc value PC. | |
294 | Returns 0 if function is not known. Backward compatibility, no section */ | |
295 | ||
296 | struct symbol * | |
fba45db2 | 297 | find_pc_function (CORE_ADDR pc) |
c906108c SS |
298 | { |
299 | return find_pc_sect_function (pc, find_pc_mapped_section (pc)); | |
300 | } | |
301 | ||
302 | /* These variables are used to cache the most recent result | |
303 | * of find_pc_partial_function. */ | |
304 | ||
c5aa993b JM |
305 | static CORE_ADDR cache_pc_function_low = 0; |
306 | static CORE_ADDR cache_pc_function_high = 0; | |
307 | static char *cache_pc_function_name = 0; | |
c906108c SS |
308 | static struct sec *cache_pc_function_section = NULL; |
309 | ||
310 | /* Clear cache, e.g. when symbol table is discarded. */ | |
311 | ||
312 | void | |
fba45db2 | 313 | clear_pc_function_cache (void) |
c906108c SS |
314 | { |
315 | cache_pc_function_low = 0; | |
316 | cache_pc_function_high = 0; | |
c5aa993b | 317 | cache_pc_function_name = (char *) 0; |
c906108c SS |
318 | cache_pc_function_section = NULL; |
319 | } | |
320 | ||
321 | /* Finds the "function" (text symbol) that is smaller than PC but | |
322 | greatest of all of the potential text symbols in SECTION. Sets | |
323 | *NAME and/or *ADDRESS conditionally if that pointer is non-null. | |
324 | If ENDADDR is non-null, then set *ENDADDR to be the end of the | |
325 | function (exclusive), but passing ENDADDR as non-null means that | |
326 | the function might cause symbols to be read. This function either | |
327 | succeeds or fails (not halfway succeeds). If it succeeds, it sets | |
328 | *NAME, *ADDRESS, and *ENDADDR to real information and returns 1. | |
329 | If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and | |
330 | returns 0. */ | |
331 | ||
332 | int | |
fba45db2 KB |
333 | find_pc_sect_partial_function (CORE_ADDR pc, asection *section, char **name, |
334 | CORE_ADDR *address, CORE_ADDR *endaddr) | |
c906108c SS |
335 | { |
336 | struct partial_symtab *pst; | |
c5aa993b | 337 | struct symbol *f; |
c906108c SS |
338 | struct minimal_symbol *msymbol; |
339 | struct partial_symbol *psb; | |
c5aa993b | 340 | struct obj_section *osect; |
c906108c SS |
341 | int i; |
342 | CORE_ADDR mapped_pc; | |
343 | ||
344 | mapped_pc = overlay_mapped_address (pc, section); | |
345 | ||
247055de MK |
346 | if (mapped_pc >= cache_pc_function_low |
347 | && mapped_pc < cache_pc_function_high | |
348 | && section == cache_pc_function_section) | |
c906108c SS |
349 | goto return_cached_value; |
350 | ||
351 | /* If sigtramp is in the u area, it counts as a function (especially | |
352 | important for step_1). */ | |
43156d82 | 353 | if (SIGTRAMP_START_P () && PC_IN_SIGTRAMP (mapped_pc, (char *) NULL)) |
c906108c | 354 | { |
c5aa993b JM |
355 | cache_pc_function_low = SIGTRAMP_START (mapped_pc); |
356 | cache_pc_function_high = SIGTRAMP_END (mapped_pc); | |
357 | cache_pc_function_name = "<sigtramp>"; | |
c906108c SS |
358 | cache_pc_function_section = section; |
359 | goto return_cached_value; | |
360 | } | |
c906108c SS |
361 | |
362 | msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section); | |
363 | pst = find_pc_sect_psymtab (mapped_pc, section); | |
364 | if (pst) | |
365 | { | |
366 | /* Need to read the symbols to get a good value for the end address. */ | |
367 | if (endaddr != NULL && !pst->readin) | |
368 | { | |
369 | /* Need to get the terminal in case symbol-reading produces | |
370 | output. */ | |
371 | target_terminal_ours_for_output (); | |
372 | PSYMTAB_TO_SYMTAB (pst); | |
373 | } | |
374 | ||
375 | if (pst->readin) | |
376 | { | |
377 | /* Checking whether the msymbol has a larger value is for the | |
378 | "pathological" case mentioned in print_frame_info. */ | |
379 | f = find_pc_sect_function (mapped_pc, section); | |
380 | if (f != NULL | |
381 | && (msymbol == NULL | |
382 | || (BLOCK_START (SYMBOL_BLOCK_VALUE (f)) | |
383 | >= SYMBOL_VALUE_ADDRESS (msymbol)))) | |
384 | { | |
c5aa993b JM |
385 | cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f)); |
386 | cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f)); | |
22abf04a | 387 | cache_pc_function_name = DEPRECATED_SYMBOL_NAME (f); |
c906108c SS |
388 | cache_pc_function_section = section; |
389 | goto return_cached_value; | |
390 | } | |
391 | } | |
392 | else | |
393 | { | |
394 | /* Now that static symbols go in the minimal symbol table, perhaps | |
395 | we could just ignore the partial symbols. But at least for now | |
396 | we use the partial or minimal symbol, whichever is larger. */ | |
397 | psb = find_pc_sect_psymbol (pst, mapped_pc, section); | |
398 | ||
399 | if (psb | |
400 | && (msymbol == NULL || | |
401 | (SYMBOL_VALUE_ADDRESS (psb) | |
402 | >= SYMBOL_VALUE_ADDRESS (msymbol)))) | |
403 | { | |
404 | /* This case isn't being cached currently. */ | |
405 | if (address) | |
406 | *address = SYMBOL_VALUE_ADDRESS (psb); | |
407 | if (name) | |
22abf04a | 408 | *name = DEPRECATED_SYMBOL_NAME (psb); |
c906108c SS |
409 | /* endaddr non-NULL can't happen here. */ |
410 | return 1; | |
411 | } | |
412 | } | |
413 | } | |
414 | ||
415 | /* Not in the normal symbol tables, see if the pc is in a known section. | |
416 | If it's not, then give up. This ensures that anything beyond the end | |
417 | of the text seg doesn't appear to be part of the last function in the | |
418 | text segment. */ | |
419 | ||
420 | osect = find_pc_sect_section (mapped_pc, section); | |
421 | ||
422 | if (!osect) | |
423 | msymbol = NULL; | |
424 | ||
425 | /* Must be in the minimal symbol table. */ | |
426 | if (msymbol == NULL) | |
427 | { | |
428 | /* No available symbol. */ | |
429 | if (name != NULL) | |
430 | *name = 0; | |
431 | if (address != NULL) | |
432 | *address = 0; | |
433 | if (endaddr != NULL) | |
434 | *endaddr = 0; | |
435 | return 0; | |
436 | } | |
437 | ||
c5aa993b | 438 | cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol); |
22abf04a | 439 | cache_pc_function_name = DEPRECATED_SYMBOL_NAME (msymbol); |
c906108c SS |
440 | cache_pc_function_section = section; |
441 | ||
442 | /* Use the lesser of the next minimal symbol in the same section, or | |
443 | the end of the section, as the end of the function. */ | |
c5aa993b | 444 | |
c906108c SS |
445 | /* Step over other symbols at this same address, and symbols in |
446 | other sections, to find the next symbol in this section with | |
447 | a different address. */ | |
448 | ||
22abf04a | 449 | for (i = 1; DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL; i++) |
c906108c | 450 | { |
c5aa993b | 451 | if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol) |
247055de | 452 | && SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol)) |
c906108c SS |
453 | break; |
454 | } | |
455 | ||
22abf04a | 456 | if (DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL |
c906108c SS |
457 | && SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr) |
458 | cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i); | |
459 | else | |
460 | /* We got the start address from the last msymbol in the objfile. | |
461 | So the end address is the end of the section. */ | |
462 | cache_pc_function_high = osect->endaddr; | |
463 | ||
247055de | 464 | return_cached_value: |
c906108c SS |
465 | |
466 | if (address) | |
467 | { | |
468 | if (pc_in_unmapped_range (pc, section)) | |
c5aa993b | 469 | *address = overlay_unmapped_address (cache_pc_function_low, section); |
c906108c | 470 | else |
c5aa993b | 471 | *address = cache_pc_function_low; |
c906108c | 472 | } |
c5aa993b | 473 | |
c906108c SS |
474 | if (name) |
475 | *name = cache_pc_function_name; | |
476 | ||
477 | if (endaddr) | |
478 | { | |
479 | if (pc_in_unmapped_range (pc, section)) | |
c5aa993b | 480 | { |
c906108c SS |
481 | /* Because the high address is actually beyond the end of |
482 | the function (and therefore possibly beyond the end of | |
247055de MK |
483 | the overlay), we must actually convert (high - 1) and |
484 | then add one to that. */ | |
c906108c | 485 | |
c5aa993b | 486 | *endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1, |
c906108c | 487 | section); |
c5aa993b | 488 | } |
c906108c | 489 | else |
c5aa993b | 490 | *endaddr = cache_pc_function_high; |
c906108c SS |
491 | } |
492 | ||
493 | return 1; | |
494 | } | |
495 | ||
247055de | 496 | /* Backward compatibility, no section argument. */ |
c906108c SS |
497 | |
498 | int | |
fba45db2 KB |
499 | find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address, |
500 | CORE_ADDR *endaddr) | |
c906108c | 501 | { |
c5aa993b | 502 | asection *section; |
c906108c SS |
503 | |
504 | section = find_pc_overlay (pc); | |
505 | return find_pc_sect_partial_function (pc, section, name, address, endaddr); | |
506 | } | |
507 | ||
508 | /* Return the innermost stack frame executing inside of BLOCK, | |
509 | or NULL if there is no such frame. If BLOCK is NULL, just return NULL. */ | |
510 | ||
511 | struct frame_info * | |
fba45db2 | 512 | block_innermost_frame (struct block *block) |
c906108c SS |
513 | { |
514 | struct frame_info *frame; | |
515 | register CORE_ADDR start; | |
516 | register CORE_ADDR end; | |
42f99ac2 | 517 | CORE_ADDR calling_pc; |
c906108c SS |
518 | |
519 | if (block == NULL) | |
520 | return NULL; | |
521 | ||
522 | start = BLOCK_START (block); | |
523 | end = BLOCK_END (block); | |
524 | ||
525 | frame = NULL; | |
526 | while (1) | |
527 | { | |
528 | frame = get_prev_frame (frame); | |
529 | if (frame == NULL) | |
530 | return NULL; | |
c4a09524 | 531 | calling_pc = get_frame_address_in_block (frame); |
42f99ac2 | 532 | if (calling_pc >= start && calling_pc < end) |
c906108c SS |
533 | return frame; |
534 | } | |
535 | } | |
536 | ||
7a292a7a SS |
537 | /* Are we in a call dummy? The code below which allows DECR_PC_AFTER_BREAK |
538 | below is for infrun.c, which may give the macro a pc without that | |
539 | subtracted out. */ | |
540 | ||
7a292a7a SS |
541 | /* Is the PC in a call dummy? SP and FRAME_ADDRESS are the bottom and |
542 | top of the stack frame which we are checking, where "bottom" and | |
543 | "top" refer to some section of memory which contains the code for | |
544 | the call dummy. Calls to this macro assume that the contents of | |
0ba6dca9 AC |
545 | SP_REGNUM and DEPRECATED_FP_REGNUM (or the saved values thereof), |
546 | respectively, are the things to pass. | |
547 | ||
548 | This won't work on the 29k, where SP_REGNUM and | |
549 | DEPRECATED_FP_REGNUM don't have that meaning, but the 29k doesn't | |
550 | use ON_STACK. This could be fixed by generalizing this scheme, | |
551 | perhaps by passing in a frame and adding a few fields, at least on | |
552 | machines which need them for DEPRECATED_PC_IN_CALL_DUMMY. | |
7a292a7a SS |
553 | |
554 | Something simpler, like checking for the stack segment, doesn't work, | |
555 | since various programs (threads implementations, gcc nested function | |
556 | stubs, etc) may either allocate stack frames in another segment, or | |
557 | allocate other kinds of code on the stack. */ | |
558 | ||
559 | int | |
b4b88177 AC |
560 | deprecated_pc_in_call_dummy_on_stack (CORE_ADDR pc, CORE_ADDR sp, |
561 | CORE_ADDR frame_address) | |
7a292a7a SS |
562 | { |
563 | return (INNER_THAN ((sp), (pc)) | |
564 | && (frame_address != 0) | |
565 | && INNER_THAN ((pc), (frame_address))); | |
566 | } | |
567 | ||
568 | int | |
b4b88177 AC |
569 | deprecated_pc_in_call_dummy_at_entry_point (CORE_ADDR pc, CORE_ADDR sp, |
570 | CORE_ADDR frame_address) | |
7a292a7a SS |
571 | { |
572 | return ((pc) >= CALL_DUMMY_ADDRESS () | |
573 | && (pc) <= (CALL_DUMMY_ADDRESS () + DECR_PC_AFTER_BREAK)); | |
574 | } | |
575 | ||
e6ba3bc9 AC |
576 | /* Returns true for a user frame or a call_function_by_hand dummy |
577 | frame, and false for the CRT0 start-up frame. Purpose is to | |
578 | terminate backtrace. */ | |
c5aa993b | 579 | |
c906108c | 580 | int |
e6ba3bc9 | 581 | legacy_frame_chain_valid (CORE_ADDR fp, struct frame_info *fi) |
c906108c | 582 | { |
51603483 DJ |
583 | /* Don't prune CALL_DUMMY frames. */ |
584 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES | |
585 | && DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0)) | |
586 | return 1; | |
587 | ||
588 | /* If the new frame pointer is zero, then it isn't valid. */ | |
589 | if (fp == 0) | |
590 | return 0; | |
591 | ||
592 | /* If the new frame would be inside (younger than) the previous frame, | |
593 | then it isn't valid. */ | |
594 | if (INNER_THAN (fp, get_frame_base (fi))) | |
595 | return 0; | |
596 | ||
7c86889b CV |
597 | /* If the architecture has a custom DEPRECATED_FRAME_CHAIN_VALID, |
598 | call it now. */ | |
599 | if (DEPRECATED_FRAME_CHAIN_VALID_P ()) | |
600 | return DEPRECATED_FRAME_CHAIN_VALID (fp, fi); | |
601 | ||
51603483 DJ |
602 | /* If we're already inside the entry function for the main objfile, then it |
603 | isn't valid. */ | |
604 | if (inside_entry_func (get_frame_pc (fi))) | |
605 | return 0; | |
606 | ||
607 | /* If we're inside the entry file, it isn't valid. */ | |
608 | /* NOTE/drow 2002-12-25: should there be a way to disable this check? It | |
609 | assumes a single small entry file, and the way some debug readers (e.g. | |
610 | dbxread) figure out which object is the entry file is somewhat hokey. */ | |
611 | if (inside_entry_file (frame_pc_unwind (fi))) | |
612 | return 0; | |
613 | ||
51603483 | 614 | return 1; |
c906108c | 615 | } |