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 | |
627b3ba2 | 56 | deprecated_inside_entry_file (CORE_ADDR addr) |
c906108c SS |
57 | { |
58 | if (addr == 0) | |
59 | return 1; | |
60 | if (symfile_objfile == 0) | |
61 | return 0; | |
9710e734 AC |
62 | if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT |
63 | || CALL_DUMMY_LOCATION == AT_SYMBOL) | |
7a292a7a SS |
64 | { |
65 | /* Do not stop backtracing if the pc is in the call dummy | |
c5aa993b | 66 | at the entry point. */ |
7a292a7a | 67 | /* FIXME: Won't always work with zeros for the last two arguments */ |
ae45cd16 | 68 | if (DEPRECATED_PC_IN_CALL_DUMMY (addr, 0, 0)) |
7a292a7a SS |
69 | return 0; |
70 | } | |
627b3ba2 AC |
71 | return (addr >= symfile_objfile->ei.deprecated_entry_file_lowpc && |
72 | addr < symfile_objfile->ei.deprecated_entry_file_highpc); | |
c906108c SS |
73 | } |
74 | ||
75 | /* Test a specified PC value to see if it is in the range of addresses | |
76 | that correspond to the main() function. See comments above for why | |
77 | we might want to do this. | |
78 | ||
618ce49f | 79 | Typically called from DEPRECATED_FRAME_CHAIN_VALID. |
c906108c SS |
80 | |
81 | A PC of zero is always considered to be the bottom of the stack. */ | |
82 | ||
83 | int | |
fba45db2 | 84 | inside_main_func (CORE_ADDR pc) |
c906108c SS |
85 | { |
86 | if (pc == 0) | |
87 | return 1; | |
88 | if (symfile_objfile == 0) | |
89 | return 0; | |
90 | ||
618ce49f AC |
91 | /* If the addr range is not set up at symbol reading time, set it up |
92 | now. This is for DEPRECATED_FRAME_CHAIN_VALID_ALTERNATE. I do | |
93 | this for coff, because it is unable to set it up and symbol | |
94 | reading time. */ | |
c906108c | 95 | |
c5aa993b JM |
96 | if (symfile_objfile->ei.main_func_lowpc == INVALID_ENTRY_LOWPC && |
97 | symfile_objfile->ei.main_func_highpc == INVALID_ENTRY_HIGHPC) | |
c906108c SS |
98 | { |
99 | struct symbol *mainsym; | |
100 | ||
176620f1 | 101 | mainsym = lookup_symbol (main_name (), NULL, VAR_DOMAIN, NULL, NULL); |
c5aa993b JM |
102 | if (mainsym && SYMBOL_CLASS (mainsym) == LOC_BLOCK) |
103 | { | |
104 | symfile_objfile->ei.main_func_lowpc = | |
c906108c | 105 | BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym)); |
c5aa993b | 106 | symfile_objfile->ei.main_func_highpc = |
c906108c | 107 | BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym)); |
c5aa993b | 108 | } |
c906108c | 109 | } |
0714963c AC |
110 | |
111 | /* Not in the normal symbol tables, see if "main" is in the partial | |
112 | symbol table. If it's not, then give up. */ | |
113 | { | |
114 | struct minimal_symbol *msymbol | |
115 | = lookup_minimal_symbol (main_name (), NULL, symfile_objfile); | |
116 | if (msymbol != NULL && MSYMBOL_TYPE (msymbol) == mst_text) | |
117 | { | |
118 | struct obj_section *osect | |
119 | = find_pc_sect_section (SYMBOL_VALUE_ADDRESS (msymbol), | |
120 | msymbol->ginfo.bfd_section); | |
121 | if (osect != NULL) | |
122 | { | |
123 | int i; | |
124 | /* Step over other symbols at this same address, and | |
125 | symbols in other sections, to find the next symbol in | |
126 | this section with a different address. */ | |
127 | for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++) | |
128 | { | |
129 | if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol) | |
130 | && SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol)) | |
131 | break; | |
132 | } | |
133 | ||
134 | symfile_objfile->ei.main_func_lowpc = SYMBOL_VALUE_ADDRESS (msymbol); | |
135 | ||
136 | /* Use the lesser of the next minimal symbol in the same | |
137 | section, or the end of the section, as the end of the | |
138 | function. */ | |
139 | if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL | |
140 | && SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr) | |
141 | symfile_objfile->ei.main_func_highpc = SYMBOL_VALUE_ADDRESS (msymbol + i); | |
142 | else | |
143 | /* We got the start address from the last msymbol in the | |
144 | objfile. So the end address is the end of the | |
145 | section. */ | |
146 | symfile_objfile->ei.main_func_highpc = osect->endaddr; | |
147 | } | |
148 | } | |
149 | } | |
150 | ||
c5aa993b JM |
151 | return (symfile_objfile->ei.main_func_lowpc <= pc && |
152 | symfile_objfile->ei.main_func_highpc > pc); | |
c906108c SS |
153 | } |
154 | ||
155 | /* Test a specified PC value to see if it is in the range of addresses | |
156 | that correspond to the process entry point function. See comments | |
157 | in objfiles.h for why we might want to do this. | |
158 | ||
618ce49f | 159 | Typically called from DEPRECATED_FRAME_CHAIN_VALID. |
c906108c SS |
160 | |
161 | A PC of zero is always considered to be the bottom of the stack. */ | |
162 | ||
163 | int | |
fba45db2 | 164 | inside_entry_func (CORE_ADDR pc) |
c906108c SS |
165 | { |
166 | if (pc == 0) | |
167 | return 1; | |
168 | if (symfile_objfile == 0) | |
169 | return 0; | |
7a292a7a SS |
170 | if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT) |
171 | { | |
172 | /* Do not stop backtracing if the pc is in the call dummy | |
c5aa993b | 173 | at the entry point. */ |
7a292a7a | 174 | /* FIXME: Won't always work with zeros for the last two arguments */ |
ae45cd16 | 175 | if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) |
7a292a7a SS |
176 | return 0; |
177 | } | |
c5aa993b JM |
178 | return (symfile_objfile->ei.entry_func_lowpc <= pc && |
179 | symfile_objfile->ei.entry_func_highpc > pc); | |
c906108c SS |
180 | } |
181 | ||
c906108c SS |
182 | /* Return nonzero if the function for this frame lacks a prologue. Many |
183 | machines can define FRAMELESS_FUNCTION_INVOCATION to just call this | |
184 | function. */ | |
185 | ||
186 | int | |
fba45db2 | 187 | frameless_look_for_prologue (struct frame_info *frame) |
c906108c | 188 | { |
e76c5fcc | 189 | CORE_ADDR func_start; |
53a5351d | 190 | |
be41e9f4 | 191 | func_start = get_frame_func (frame); |
c906108c SS |
192 | if (func_start) |
193 | { | |
194 | func_start += FUNCTION_START_OFFSET; | |
53a5351d JM |
195 | /* This is faster, since only care whether there *is* a |
196 | prologue, not how long it is. */ | |
dad41f9a | 197 | return PROLOGUE_FRAMELESS_P (func_start); |
c906108c | 198 | } |
bdd78e62 | 199 | else if (get_frame_pc (frame) == 0) |
53a5351d JM |
200 | /* A frame with a zero PC is usually created by dereferencing a |
201 | NULL function pointer, normally causing an immediate core dump | |
202 | of the inferior. Mark function as frameless, as the inferior | |
203 | has no chance of setting up a stack frame. */ | |
c906108c SS |
204 | return 1; |
205 | else | |
206 | /* If we can't find the start of the function, we don't really | |
207 | know whether the function is frameless, but we should be able | |
208 | to get a reasonable (i.e. best we can do under the | |
209 | circumstances) backtrace by saying that it isn't. */ | |
210 | return 0; | |
211 | } | |
212 | ||
c906108c | 213 | /* Return the innermost lexical block in execution |
ae767bfb JB |
214 | in a specified stack frame. The frame address is assumed valid. |
215 | ||
216 | If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code | |
217 | address we used to choose the block. We use this to find a source | |
218 | line, to decide which macro definitions are in scope. | |
219 | ||
220 | The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's | |
221 | PC, and may not really be a valid PC at all. For example, in the | |
222 | caller of a function declared to never return, the code at the | |
223 | return address will never be reached, so the call instruction may | |
224 | be the very last instruction in the block. So the address we use | |
225 | to choose the block is actually one byte before the return address | |
226 | --- hopefully pointing us at the call instruction, or its delay | |
227 | slot instruction. */ | |
c906108c SS |
228 | |
229 | struct block * | |
ae767bfb | 230 | get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block) |
c906108c | 231 | { |
c4a09524 | 232 | const CORE_ADDR pc = get_frame_address_in_block (frame); |
ae767bfb JB |
233 | |
234 | if (addr_in_block) | |
235 | *addr_in_block = pc; | |
236 | ||
c906108c SS |
237 | return block_for_pc (pc); |
238 | } | |
239 | ||
c906108c | 240 | CORE_ADDR |
fba45db2 | 241 | get_pc_function_start (CORE_ADDR pc) |
c906108c | 242 | { |
2cdd89cb MK |
243 | struct block *bl; |
244 | struct minimal_symbol *msymbol; | |
c906108c | 245 | |
2cdd89cb MK |
246 | bl = block_for_pc (pc); |
247 | if (bl) | |
c906108c | 248 | { |
2cdd89cb MK |
249 | struct symbol *symbol = block_function (bl); |
250 | ||
251 | if (symbol) | |
252 | { | |
253 | bl = SYMBOL_BLOCK_VALUE (symbol); | |
254 | return BLOCK_START (bl); | |
255 | } | |
c906108c | 256 | } |
2cdd89cb MK |
257 | |
258 | msymbol = lookup_minimal_symbol_by_pc (pc); | |
259 | if (msymbol) | |
c906108c | 260 | { |
2cdd89cb MK |
261 | CORE_ADDR fstart = SYMBOL_VALUE_ADDRESS (msymbol); |
262 | ||
263 | if (find_pc_section (fstart)) | |
264 | return fstart; | |
c906108c | 265 | } |
2cdd89cb MK |
266 | |
267 | return 0; | |
c906108c SS |
268 | } |
269 | ||
270 | /* Return the symbol for the function executing in frame FRAME. */ | |
271 | ||
272 | struct symbol * | |
fba45db2 | 273 | get_frame_function (struct frame_info *frame) |
c906108c | 274 | { |
52f0bd74 | 275 | struct block *bl = get_frame_block (frame, 0); |
c906108c SS |
276 | if (bl == 0) |
277 | return 0; | |
278 | return block_function (bl); | |
279 | } | |
280 | \f | |
281 | ||
c906108c SS |
282 | /* Return the function containing pc value PC in section SECTION. |
283 | Returns 0 if function is not known. */ | |
284 | ||
285 | struct symbol * | |
fba45db2 | 286 | find_pc_sect_function (CORE_ADDR pc, struct sec *section) |
c906108c | 287 | { |
52f0bd74 | 288 | struct block *b = block_for_pc_sect (pc, section); |
c906108c SS |
289 | if (b == 0) |
290 | return 0; | |
291 | return block_function (b); | |
292 | } | |
293 | ||
294 | /* Return the function containing pc value PC. | |
295 | Returns 0 if function is not known. Backward compatibility, no section */ | |
296 | ||
297 | struct symbol * | |
fba45db2 | 298 | find_pc_function (CORE_ADDR pc) |
c906108c SS |
299 | { |
300 | return find_pc_sect_function (pc, find_pc_mapped_section (pc)); | |
301 | } | |
302 | ||
303 | /* These variables are used to cache the most recent result | |
304 | * of find_pc_partial_function. */ | |
305 | ||
c5aa993b JM |
306 | static CORE_ADDR cache_pc_function_low = 0; |
307 | static CORE_ADDR cache_pc_function_high = 0; | |
308 | static char *cache_pc_function_name = 0; | |
c906108c SS |
309 | static struct sec *cache_pc_function_section = NULL; |
310 | ||
311 | /* Clear cache, e.g. when symbol table is discarded. */ | |
312 | ||
313 | void | |
fba45db2 | 314 | clear_pc_function_cache (void) |
c906108c SS |
315 | { |
316 | cache_pc_function_low = 0; | |
317 | cache_pc_function_high = 0; | |
c5aa993b | 318 | cache_pc_function_name = (char *) 0; |
c906108c SS |
319 | cache_pc_function_section = NULL; |
320 | } | |
321 | ||
322 | /* Finds the "function" (text symbol) that is smaller than PC but | |
323 | greatest of all of the potential text symbols in SECTION. Sets | |
324 | *NAME and/or *ADDRESS conditionally if that pointer is non-null. | |
325 | If ENDADDR is non-null, then set *ENDADDR to be the end of the | |
326 | function (exclusive), but passing ENDADDR as non-null means that | |
327 | the function might cause symbols to be read. This function either | |
328 | succeeds or fails (not halfway succeeds). If it succeeds, it sets | |
329 | *NAME, *ADDRESS, and *ENDADDR to real information and returns 1. | |
330 | If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and | |
331 | returns 0. */ | |
332 | ||
333 | int | |
fba45db2 KB |
334 | find_pc_sect_partial_function (CORE_ADDR pc, asection *section, char **name, |
335 | CORE_ADDR *address, CORE_ADDR *endaddr) | |
c906108c SS |
336 | { |
337 | struct partial_symtab *pst; | |
c5aa993b | 338 | struct symbol *f; |
c906108c SS |
339 | struct minimal_symbol *msymbol; |
340 | struct partial_symbol *psb; | |
c5aa993b | 341 | struct obj_section *osect; |
c906108c SS |
342 | int i; |
343 | CORE_ADDR mapped_pc; | |
344 | ||
345 | mapped_pc = overlay_mapped_address (pc, section); | |
346 | ||
247055de MK |
347 | if (mapped_pc >= cache_pc_function_low |
348 | && mapped_pc < cache_pc_function_high | |
349 | && section == cache_pc_function_section) | |
c906108c SS |
350 | goto return_cached_value; |
351 | ||
352 | /* If sigtramp is in the u area, it counts as a function (especially | |
353 | important for step_1). */ | |
43156d82 | 354 | if (SIGTRAMP_START_P () && PC_IN_SIGTRAMP (mapped_pc, (char *) NULL)) |
c906108c | 355 | { |
c5aa993b JM |
356 | cache_pc_function_low = SIGTRAMP_START (mapped_pc); |
357 | cache_pc_function_high = SIGTRAMP_END (mapped_pc); | |
358 | cache_pc_function_name = "<sigtramp>"; | |
c906108c SS |
359 | cache_pc_function_section = section; |
360 | goto return_cached_value; | |
361 | } | |
c906108c SS |
362 | |
363 | msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section); | |
364 | pst = find_pc_sect_psymtab (mapped_pc, section); | |
365 | if (pst) | |
366 | { | |
367 | /* Need to read the symbols to get a good value for the end address. */ | |
368 | if (endaddr != NULL && !pst->readin) | |
369 | { | |
370 | /* Need to get the terminal in case symbol-reading produces | |
371 | output. */ | |
372 | target_terminal_ours_for_output (); | |
373 | PSYMTAB_TO_SYMTAB (pst); | |
374 | } | |
375 | ||
376 | if (pst->readin) | |
377 | { | |
378 | /* Checking whether the msymbol has a larger value is for the | |
379 | "pathological" case mentioned in print_frame_info. */ | |
380 | f = find_pc_sect_function (mapped_pc, section); | |
381 | if (f != NULL | |
382 | && (msymbol == NULL | |
383 | || (BLOCK_START (SYMBOL_BLOCK_VALUE (f)) | |
384 | >= SYMBOL_VALUE_ADDRESS (msymbol)))) | |
385 | { | |
c5aa993b JM |
386 | cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f)); |
387 | cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f)); | |
22abf04a | 388 | cache_pc_function_name = DEPRECATED_SYMBOL_NAME (f); |
c906108c SS |
389 | cache_pc_function_section = section; |
390 | goto return_cached_value; | |
391 | } | |
392 | } | |
393 | else | |
394 | { | |
395 | /* Now that static symbols go in the minimal symbol table, perhaps | |
396 | we could just ignore the partial symbols. But at least for now | |
397 | we use the partial or minimal symbol, whichever is larger. */ | |
398 | psb = find_pc_sect_psymbol (pst, mapped_pc, section); | |
399 | ||
400 | if (psb | |
401 | && (msymbol == NULL || | |
402 | (SYMBOL_VALUE_ADDRESS (psb) | |
403 | >= SYMBOL_VALUE_ADDRESS (msymbol)))) | |
404 | { | |
405 | /* This case isn't being cached currently. */ | |
406 | if (address) | |
407 | *address = SYMBOL_VALUE_ADDRESS (psb); | |
408 | if (name) | |
22abf04a | 409 | *name = DEPRECATED_SYMBOL_NAME (psb); |
c906108c SS |
410 | /* endaddr non-NULL can't happen here. */ |
411 | return 1; | |
412 | } | |
413 | } | |
414 | } | |
415 | ||
416 | /* Not in the normal symbol tables, see if the pc is in a known section. | |
417 | If it's not, then give up. This ensures that anything beyond the end | |
418 | of the text seg doesn't appear to be part of the last function in the | |
419 | text segment. */ | |
420 | ||
421 | osect = find_pc_sect_section (mapped_pc, section); | |
422 | ||
423 | if (!osect) | |
424 | msymbol = NULL; | |
425 | ||
426 | /* Must be in the minimal symbol table. */ | |
427 | if (msymbol == NULL) | |
428 | { | |
429 | /* No available symbol. */ | |
430 | if (name != NULL) | |
431 | *name = 0; | |
432 | if (address != NULL) | |
433 | *address = 0; | |
434 | if (endaddr != NULL) | |
435 | *endaddr = 0; | |
436 | return 0; | |
437 | } | |
438 | ||
c5aa993b | 439 | cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol); |
22abf04a | 440 | cache_pc_function_name = DEPRECATED_SYMBOL_NAME (msymbol); |
c906108c SS |
441 | cache_pc_function_section = section; |
442 | ||
443 | /* Use the lesser of the next minimal symbol in the same section, or | |
444 | the end of the section, as the end of the function. */ | |
c5aa993b | 445 | |
c906108c SS |
446 | /* Step over other symbols at this same address, and symbols in |
447 | other sections, to find the next symbol in this section with | |
448 | a different address. */ | |
449 | ||
22abf04a | 450 | for (i = 1; DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL; i++) |
c906108c | 451 | { |
c5aa993b | 452 | if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol) |
247055de | 453 | && SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol)) |
c906108c SS |
454 | break; |
455 | } | |
456 | ||
22abf04a | 457 | if (DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL |
c906108c SS |
458 | && SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr) |
459 | cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i); | |
460 | else | |
461 | /* We got the start address from the last msymbol in the objfile. | |
462 | So the end address is the end of the section. */ | |
463 | cache_pc_function_high = osect->endaddr; | |
464 | ||
247055de | 465 | return_cached_value: |
c906108c SS |
466 | |
467 | if (address) | |
468 | { | |
469 | if (pc_in_unmapped_range (pc, section)) | |
c5aa993b | 470 | *address = overlay_unmapped_address (cache_pc_function_low, section); |
c906108c | 471 | else |
c5aa993b | 472 | *address = cache_pc_function_low; |
c906108c | 473 | } |
c5aa993b | 474 | |
c906108c SS |
475 | if (name) |
476 | *name = cache_pc_function_name; | |
477 | ||
478 | if (endaddr) | |
479 | { | |
480 | if (pc_in_unmapped_range (pc, section)) | |
c5aa993b | 481 | { |
c906108c SS |
482 | /* Because the high address is actually beyond the end of |
483 | the function (and therefore possibly beyond the end of | |
247055de MK |
484 | the overlay), we must actually convert (high - 1) and |
485 | then add one to that. */ | |
c906108c | 486 | |
c5aa993b | 487 | *endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1, |
c906108c | 488 | section); |
c5aa993b | 489 | } |
c906108c | 490 | else |
c5aa993b | 491 | *endaddr = cache_pc_function_high; |
c906108c SS |
492 | } |
493 | ||
494 | return 1; | |
495 | } | |
496 | ||
247055de | 497 | /* Backward compatibility, no section argument. */ |
c906108c SS |
498 | |
499 | int | |
fba45db2 KB |
500 | find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address, |
501 | CORE_ADDR *endaddr) | |
c906108c | 502 | { |
c5aa993b | 503 | asection *section; |
c906108c SS |
504 | |
505 | section = find_pc_overlay (pc); | |
506 | return find_pc_sect_partial_function (pc, section, name, address, endaddr); | |
507 | } | |
508 | ||
509 | /* Return the innermost stack frame executing inside of BLOCK, | |
510 | or NULL if there is no such frame. If BLOCK is NULL, just return NULL. */ | |
511 | ||
512 | struct frame_info * | |
fba45db2 | 513 | block_innermost_frame (struct block *block) |
c906108c SS |
514 | { |
515 | struct frame_info *frame; | |
52f0bd74 AC |
516 | CORE_ADDR start; |
517 | CORE_ADDR end; | |
42f99ac2 | 518 | CORE_ADDR calling_pc; |
c906108c SS |
519 | |
520 | if (block == NULL) | |
521 | return NULL; | |
522 | ||
523 | start = BLOCK_START (block); | |
524 | end = BLOCK_END (block); | |
525 | ||
526 | frame = NULL; | |
527 | while (1) | |
528 | { | |
529 | frame = get_prev_frame (frame); | |
530 | if (frame == NULL) | |
531 | return NULL; | |
c4a09524 | 532 | calling_pc = get_frame_address_in_block (frame); |
42f99ac2 | 533 | if (calling_pc >= start && calling_pc < end) |
c906108c SS |
534 | return frame; |
535 | } | |
536 | } | |
537 | ||
7a292a7a SS |
538 | /* Are we in a call dummy? The code below which allows DECR_PC_AFTER_BREAK |
539 | below is for infrun.c, which may give the macro a pc without that | |
540 | subtracted out. */ | |
541 | ||
7a292a7a SS |
542 | /* Is the PC in a call dummy? SP and FRAME_ADDRESS are the bottom and |
543 | top of the stack frame which we are checking, where "bottom" and | |
544 | "top" refer to some section of memory which contains the code for | |
545 | the call dummy. Calls to this macro assume that the contents of | |
0ba6dca9 AC |
546 | SP_REGNUM and DEPRECATED_FP_REGNUM (or the saved values thereof), |
547 | respectively, are the things to pass. | |
548 | ||
549 | This won't work on the 29k, where SP_REGNUM and | |
550 | DEPRECATED_FP_REGNUM don't have that meaning, but the 29k doesn't | |
551 | use ON_STACK. This could be fixed by generalizing this scheme, | |
552 | perhaps by passing in a frame and adding a few fields, at least on | |
553 | machines which need them for DEPRECATED_PC_IN_CALL_DUMMY. | |
7a292a7a SS |
554 | |
555 | Something simpler, like checking for the stack segment, doesn't work, | |
556 | since various programs (threads implementations, gcc nested function | |
557 | stubs, etc) may either allocate stack frames in another segment, or | |
558 | allocate other kinds of code on the stack. */ | |
559 | ||
560 | int | |
b4b88177 AC |
561 | deprecated_pc_in_call_dummy_on_stack (CORE_ADDR pc, CORE_ADDR sp, |
562 | CORE_ADDR frame_address) | |
7a292a7a SS |
563 | { |
564 | return (INNER_THAN ((sp), (pc)) | |
565 | && (frame_address != 0) | |
566 | && INNER_THAN ((pc), (frame_address))); | |
567 | } | |
568 | ||
569 | int | |
b4b88177 AC |
570 | deprecated_pc_in_call_dummy_at_entry_point (CORE_ADDR pc, CORE_ADDR sp, |
571 | CORE_ADDR frame_address) | |
7a292a7a | 572 | { |
88a82a65 AC |
573 | CORE_ADDR addr = entry_point_address (); |
574 | if (DEPRECATED_CALL_DUMMY_ADDRESS_P ()) | |
575 | addr = DEPRECATED_CALL_DUMMY_ADDRESS (); | |
576 | return ((pc) >= addr && (pc) <= (addr + DECR_PC_AFTER_BREAK)); | |
7a292a7a SS |
577 | } |
578 | ||
e6ba3bc9 AC |
579 | /* Returns true for a user frame or a call_function_by_hand dummy |
580 | frame, and false for the CRT0 start-up frame. Purpose is to | |
581 | terminate backtrace. */ | |
c5aa993b | 582 | |
c906108c | 583 | int |
e6ba3bc9 | 584 | legacy_frame_chain_valid (CORE_ADDR fp, struct frame_info *fi) |
c906108c | 585 | { |
51603483 DJ |
586 | /* Don't prune CALL_DUMMY frames. */ |
587 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES | |
588 | && DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0)) | |
589 | return 1; | |
590 | ||
591 | /* If the new frame pointer is zero, then it isn't valid. */ | |
592 | if (fp == 0) | |
593 | return 0; | |
594 | ||
595 | /* If the new frame would be inside (younger than) the previous frame, | |
596 | then it isn't valid. */ | |
597 | if (INNER_THAN (fp, get_frame_base (fi))) | |
598 | return 0; | |
599 | ||
7c86889b CV |
600 | /* If the architecture has a custom DEPRECATED_FRAME_CHAIN_VALID, |
601 | call it now. */ | |
602 | if (DEPRECATED_FRAME_CHAIN_VALID_P ()) | |
603 | return DEPRECATED_FRAME_CHAIN_VALID (fp, fi); | |
604 | ||
51603483 DJ |
605 | /* If we're already inside the entry function for the main objfile, then it |
606 | isn't valid. */ | |
607 | if (inside_entry_func (get_frame_pc (fi))) | |
608 | return 0; | |
609 | ||
610 | /* If we're inside the entry file, it isn't valid. */ | |
611 | /* NOTE/drow 2002-12-25: should there be a way to disable this check? It | |
612 | assumes a single small entry file, and the way some debug readers (e.g. | |
613 | dbxread) figure out which object is the entry file is somewhat hokey. */ | |
627b3ba2 | 614 | if (deprecated_inside_entry_file (frame_pc_unwind (fi))) |
51603483 DJ |
615 | return 0; |
616 | ||
51603483 | 617 | return 1; |
c906108c | 618 | } |