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, | |
26b0da32 MK |
5 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 |
6 | Free Software 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" | |
c906108c SS |
28 | #include "objfiles.h" |
29 | #include "frame.h" | |
30 | #include "gdbcore.h" | |
31 | #include "value.h" /* for read_register */ | |
32 | #include "target.h" /* for target_has_stack */ | |
33 | #include "inferior.h" /* for read_pc */ | |
34 | #include "annotate.h" | |
4e052eda | 35 | #include "regcache.h" |
4f460812 | 36 | #include "gdb_assert.h" |
9c1412c1 | 37 | #include "dummy-frame.h" |
51603483 DJ |
38 | #include "command.h" |
39 | #include "gdbcmd.h" | |
fe898f56 | 40 | #include "block.h" |
c906108c | 41 | |
51603483 | 42 | /* Prototypes for exported functions. */ |
c5aa993b | 43 | |
51603483 | 44 | void _initialize_blockframe (void); |
c906108c | 45 | |
618ce49f AC |
46 | /* Is ADDR inside the startup file? Note that if your machine has a |
47 | way to detect the bottom of the stack, there is no need to call | |
48 | this function from DEPRECATED_FRAME_CHAIN_VALID; the reason for | |
49 | doing so is that some machines have no way of detecting bottom of | |
50 | stack. | |
c906108c SS |
51 | |
52 | A PC of zero is always considered to be the bottom of the stack. */ | |
53 | ||
54 | int | |
627b3ba2 | 55 | deprecated_inside_entry_file (CORE_ADDR addr) |
c906108c SS |
56 | { |
57 | if (addr == 0) | |
58 | return 1; | |
59 | if (symfile_objfile == 0) | |
60 | return 0; | |
9710e734 AC |
61 | if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT |
62 | || CALL_DUMMY_LOCATION == AT_SYMBOL) | |
7a292a7a SS |
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 | } | |
627b3ba2 AC |
70 | return (addr >= symfile_objfile->ei.deprecated_entry_file_lowpc && |
71 | addr < symfile_objfile->ei.deprecated_entry_file_highpc); | |
c906108c SS |
72 | } |
73 | ||
f614e9d9 | 74 | /* Test whether PC is in the range of addresses that corresponds to |
c6831537 | 75 | the "main" function. */ |
c906108c SS |
76 | |
77 | int | |
fba45db2 | 78 | inside_main_func (CORE_ADDR pc) |
c906108c | 79 | { |
8d4ce20a JB |
80 | struct minimal_symbol *msymbol; |
81 | ||
c906108c SS |
82 | if (symfile_objfile == 0) |
83 | return 0; | |
84 | ||
8d4ce20a JB |
85 | msymbol = lookup_minimal_symbol (main_name (), NULL, symfile_objfile); |
86 | ||
f614e9d9 MK |
87 | /* If the address range hasn't been set up at symbol reading time, |
88 | set it up now. */ | |
c906108c | 89 | |
8d4ce20a JB |
90 | if (msymbol != NULL |
91 | && symfile_objfile->ei.main_func_lowpc == INVALID_ENTRY_LOWPC | |
92 | && symfile_objfile->ei.main_func_highpc == INVALID_ENTRY_HIGHPC) | |
c906108c | 93 | { |
f614e9d9 MK |
94 | /* brobecker/2003-10-10: We used to rely on lookup_symbol() to |
95 | search the symbol associated to the "main" function. | |
96 | Unfortunately, lookup_symbol() uses the current-language | |
97 | la_lookup_symbol_nonlocal function to do the global symbol | |
98 | search. Depending on the language, this can introduce | |
99 | certain side-effects, because certain languages, for instance | |
100 | Ada, may find more than one match. Therefore we prefer to | |
101 | search the "main" function symbol using its address rather | |
102 | than its name. */ | |
103 | struct symbol *mainsym = | |
104 | find_pc_function (SYMBOL_VALUE_ADDRESS (msymbol)); | |
c906108c | 105 | |
c5aa993b JM |
106 | if (mainsym && SYMBOL_CLASS (mainsym) == LOC_BLOCK) |
107 | { | |
108 | symfile_objfile->ei.main_func_lowpc = | |
c906108c | 109 | BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym)); |
c5aa993b | 110 | symfile_objfile->ei.main_func_highpc = |
c906108c | 111 | BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym)); |
c5aa993b | 112 | } |
c906108c | 113 | } |
0714963c AC |
114 | |
115 | /* Not in the normal symbol tables, see if "main" is in the partial | |
116 | symbol table. If it's not, then give up. */ | |
f614e9d9 MK |
117 | if (msymbol != NULL && MSYMBOL_TYPE (msymbol) == mst_text) |
118 | { | |
119 | CORE_ADDR maddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
120 | asection *msect = SYMBOL_BFD_SECTION (msymbol); | |
121 | struct obj_section *osect = find_pc_sect_section (maddr, msect); | |
122 | ||
123 | if (osect != NULL) | |
124 | { | |
125 | int i; | |
126 | ||
127 | /* Step over other symbols at this same address, and symbols | |
128 | in other sections, to find the next symbol in this | |
129 | section with a different address. */ | |
130 | for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++) | |
131 | { | |
132 | if (SYMBOL_VALUE_ADDRESS (msymbol + i) != maddr | |
133 | && SYMBOL_BFD_SECTION (msymbol + i) == msect) | |
134 | break; | |
135 | } | |
136 | ||
137 | symfile_objfile->ei.main_func_lowpc = maddr; | |
138 | ||
139 | /* Use the lesser of the next minimal symbol in the same | |
140 | section, or the end of the section, as the end of the | |
141 | function. */ | |
142 | if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL | |
143 | && SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr) | |
144 | symfile_objfile->ei.main_func_highpc = | |
145 | SYMBOL_VALUE_ADDRESS (msymbol + i); | |
146 | else | |
147 | /* We got the start address from the last msymbol in the | |
148 | objfile. So the end address is the end of the | |
149 | section. */ | |
150 | symfile_objfile->ei.main_func_highpc = osect->endaddr; | |
151 | } | |
152 | } | |
153 | ||
154 | return (symfile_objfile->ei.main_func_lowpc <= pc | |
155 | && symfile_objfile->ei.main_func_highpc > pc); | |
c906108c SS |
156 | } |
157 | ||
6e4c6c91 | 158 | /* Test whether THIS_FRAME is inside the process entry point function. */ |
c906108c SS |
159 | |
160 | int | |
6e4c6c91 DJ |
161 | inside_entry_func (struct frame_info *this_frame) |
162 | { | |
163 | return (get_frame_func (this_frame) == entry_point_address ()); | |
164 | } | |
165 | ||
166 | /* Similar to inside_entry_func, but accomodating legacy frame code. */ | |
167 | ||
168 | static int | |
169 | legacy_inside_entry_func (CORE_ADDR pc) | |
c906108c | 170 | { |
c906108c SS |
171 | if (symfile_objfile == 0) |
172 | return 0; | |
29ff87c5 | 173 | |
7a292a7a SS |
174 | if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT) |
175 | { | |
29ff87c5 MK |
176 | /* Do not stop backtracing if the program counter is in the call |
177 | dummy at the entry point. */ | |
178 | /* FIXME: This won't always work with zeros for the last two | |
179 | arguments. */ | |
ae45cd16 | 180 | if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) |
7a292a7a SS |
181 | return 0; |
182 | } | |
29ff87c5 MK |
183 | |
184 | return (symfile_objfile->ei.entry_func_lowpc <= pc | |
185 | && symfile_objfile->ei.entry_func_highpc > pc); | |
c906108c SS |
186 | } |
187 | ||
19772a2c AC |
188 | /* Return nonzero if the function for this frame lacks a prologue. |
189 | Many machines can define DEPRECATED_FRAMELESS_FUNCTION_INVOCATION | |
190 | to just call this function. */ | |
c906108c SS |
191 | |
192 | int | |
19772a2c | 193 | legacy_frameless_look_for_prologue (struct frame_info *frame) |
c906108c | 194 | { |
e76c5fcc | 195 | CORE_ADDR func_start; |
53a5351d | 196 | |
be41e9f4 | 197 | func_start = get_frame_func (frame); |
c906108c SS |
198 | if (func_start) |
199 | { | |
200 | func_start += FUNCTION_START_OFFSET; | |
31687c3c AC |
201 | /* NOTE: cagney/2004-02-09: Eliminated per-architecture |
202 | PROLOGUE_FRAMELESS_P call as architectures with custom | |
203 | implementations had all been deleted. Eventually even this | |
204 | function can go - GDB no longer tries to differentiate | |
205 | between framed, frameless and stackless functions. They are | |
206 | all now considered equally evil :-^. */ | |
207 | /* If skipping the prologue ends up skips nothing, there must be | |
208 | no prologue and hence no code creating a frame. There for | |
209 | the function is "frameless" :-/. */ | |
210 | return func_start == SKIP_PROLOGUE (func_start); | |
c906108c | 211 | } |
bdd78e62 | 212 | else if (get_frame_pc (frame) == 0) |
53a5351d JM |
213 | /* A frame with a zero PC is usually created by dereferencing a |
214 | NULL function pointer, normally causing an immediate core dump | |
215 | of the inferior. Mark function as frameless, as the inferior | |
216 | has no chance of setting up a stack frame. */ | |
c906108c SS |
217 | return 1; |
218 | else | |
219 | /* If we can't find the start of the function, we don't really | |
220 | know whether the function is frameless, but we should be able | |
221 | to get a reasonable (i.e. best we can do under the | |
222 | circumstances) backtrace by saying that it isn't. */ | |
223 | return 0; | |
224 | } | |
225 | ||
c906108c | 226 | /* Return the innermost lexical block in execution |
ae767bfb JB |
227 | in a specified stack frame. The frame address is assumed valid. |
228 | ||
229 | If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code | |
230 | address we used to choose the block. We use this to find a source | |
231 | line, to decide which macro definitions are in scope. | |
232 | ||
233 | The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's | |
234 | PC, and may not really be a valid PC at all. For example, in the | |
235 | caller of a function declared to never return, the code at the | |
236 | return address will never be reached, so the call instruction may | |
237 | be the very last instruction in the block. So the address we use | |
238 | to choose the block is actually one byte before the return address | |
239 | --- hopefully pointing us at the call instruction, or its delay | |
240 | slot instruction. */ | |
c906108c SS |
241 | |
242 | struct block * | |
ae767bfb | 243 | get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block) |
c906108c | 244 | { |
c4a09524 | 245 | const CORE_ADDR pc = get_frame_address_in_block (frame); |
ae767bfb JB |
246 | |
247 | if (addr_in_block) | |
248 | *addr_in_block = pc; | |
249 | ||
c906108c SS |
250 | return block_for_pc (pc); |
251 | } | |
252 | ||
c906108c | 253 | CORE_ADDR |
fba45db2 | 254 | get_pc_function_start (CORE_ADDR pc) |
c906108c | 255 | { |
2cdd89cb MK |
256 | struct block *bl; |
257 | struct minimal_symbol *msymbol; | |
c906108c | 258 | |
2cdd89cb MK |
259 | bl = block_for_pc (pc); |
260 | if (bl) | |
c906108c | 261 | { |
2cdd89cb MK |
262 | struct symbol *symbol = block_function (bl); |
263 | ||
264 | if (symbol) | |
265 | { | |
266 | bl = SYMBOL_BLOCK_VALUE (symbol); | |
267 | return BLOCK_START (bl); | |
268 | } | |
c906108c | 269 | } |
2cdd89cb MK |
270 | |
271 | msymbol = lookup_minimal_symbol_by_pc (pc); | |
272 | if (msymbol) | |
c906108c | 273 | { |
2cdd89cb MK |
274 | CORE_ADDR fstart = SYMBOL_VALUE_ADDRESS (msymbol); |
275 | ||
276 | if (find_pc_section (fstart)) | |
277 | return fstart; | |
c906108c | 278 | } |
2cdd89cb MK |
279 | |
280 | return 0; | |
c906108c SS |
281 | } |
282 | ||
283 | /* Return the symbol for the function executing in frame FRAME. */ | |
284 | ||
285 | struct symbol * | |
fba45db2 | 286 | get_frame_function (struct frame_info *frame) |
c906108c | 287 | { |
52f0bd74 | 288 | struct block *bl = get_frame_block (frame, 0); |
c906108c SS |
289 | if (bl == 0) |
290 | return 0; | |
291 | return block_function (bl); | |
292 | } | |
293 | \f | |
294 | ||
c906108c SS |
295 | /* Return the function containing pc value PC in section SECTION. |
296 | Returns 0 if function is not known. */ | |
297 | ||
298 | struct symbol * | |
198beae2 | 299 | find_pc_sect_function (CORE_ADDR pc, struct bfd_section *section) |
c906108c | 300 | { |
52f0bd74 | 301 | struct block *b = block_for_pc_sect (pc, section); |
c906108c SS |
302 | if (b == 0) |
303 | return 0; | |
304 | return block_function (b); | |
305 | } | |
306 | ||
307 | /* Return the function containing pc value PC. | |
308 | Returns 0 if function is not known. Backward compatibility, no section */ | |
309 | ||
310 | struct symbol * | |
fba45db2 | 311 | find_pc_function (CORE_ADDR pc) |
c906108c SS |
312 | { |
313 | return find_pc_sect_function (pc, find_pc_mapped_section (pc)); | |
314 | } | |
315 | ||
316 | /* These variables are used to cache the most recent result | |
317 | * of find_pc_partial_function. */ | |
318 | ||
c5aa993b JM |
319 | static CORE_ADDR cache_pc_function_low = 0; |
320 | static CORE_ADDR cache_pc_function_high = 0; | |
321 | static char *cache_pc_function_name = 0; | |
198beae2 | 322 | static struct bfd_section *cache_pc_function_section = NULL; |
c906108c SS |
323 | |
324 | /* Clear cache, e.g. when symbol table is discarded. */ | |
325 | ||
326 | void | |
fba45db2 | 327 | clear_pc_function_cache (void) |
c906108c SS |
328 | { |
329 | cache_pc_function_low = 0; | |
330 | cache_pc_function_high = 0; | |
c5aa993b | 331 | cache_pc_function_name = (char *) 0; |
c906108c SS |
332 | cache_pc_function_section = NULL; |
333 | } | |
334 | ||
335 | /* Finds the "function" (text symbol) that is smaller than PC but | |
336 | greatest of all of the potential text symbols in SECTION. Sets | |
337 | *NAME and/or *ADDRESS conditionally if that pointer is non-null. | |
338 | If ENDADDR is non-null, then set *ENDADDR to be the end of the | |
339 | function (exclusive), but passing ENDADDR as non-null means that | |
340 | the function might cause symbols to be read. This function either | |
341 | succeeds or fails (not halfway succeeds). If it succeeds, it sets | |
342 | *NAME, *ADDRESS, and *ENDADDR to real information and returns 1. | |
343 | If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and | |
344 | returns 0. */ | |
345 | ||
73912b9b AC |
346 | /* Backward compatibility, no section argument. */ |
347 | ||
c906108c | 348 | int |
73912b9b AC |
349 | find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address, |
350 | CORE_ADDR *endaddr) | |
c906108c | 351 | { |
73912b9b | 352 | struct bfd_section *section; |
c906108c | 353 | struct partial_symtab *pst; |
c5aa993b | 354 | struct symbol *f; |
c906108c SS |
355 | struct minimal_symbol *msymbol; |
356 | struct partial_symbol *psb; | |
c5aa993b | 357 | struct obj_section *osect; |
c906108c SS |
358 | int i; |
359 | CORE_ADDR mapped_pc; | |
360 | ||
73912b9b AC |
361 | /* To ensure that the symbol returned belongs to the correct setion |
362 | (and that the last [random] symbol from the previous section | |
363 | isn't returned) try to find the section containing PC. First try | |
364 | the overlay code (which by default returns NULL); and second try | |
365 | the normal section code (which almost always succeeds). */ | |
366 | section = find_pc_overlay (pc); | |
367 | if (section == NULL) | |
368 | { | |
369 | struct obj_section *obj_section = find_pc_section (pc); | |
370 | if (obj_section == NULL) | |
371 | section = NULL; | |
372 | else | |
373 | section = obj_section->the_bfd_section; | |
374 | } | |
375 | ||
c906108c SS |
376 | mapped_pc = overlay_mapped_address (pc, section); |
377 | ||
247055de MK |
378 | if (mapped_pc >= cache_pc_function_low |
379 | && mapped_pc < cache_pc_function_high | |
380 | && section == cache_pc_function_section) | |
c906108c SS |
381 | goto return_cached_value; |
382 | ||
383 | /* If sigtramp is in the u area, it counts as a function (especially | |
384 | important for step_1). */ | |
aa2a3f87 AC |
385 | /* NOTE: cagney/2004-03-16: Determining if the PC is in a signal |
386 | trampoline typically depends on the detailed analysis of dynamic | |
387 | information obtained from the inferior yet this function is | |
388 | expected to work using static information obtained from the | |
389 | symbol table. */ | |
390 | if (DEPRECATED_SIGTRAMP_START_P () | |
f561f026 | 391 | && DEPRECATED_PC_IN_SIGTRAMP (mapped_pc, (char *) NULL)) |
c906108c | 392 | { |
aa2a3f87 AC |
393 | cache_pc_function_low = DEPRECATED_SIGTRAMP_START (mapped_pc); |
394 | cache_pc_function_high = DEPRECATED_SIGTRAMP_END (mapped_pc); | |
c5aa993b | 395 | cache_pc_function_name = "<sigtramp>"; |
c906108c SS |
396 | cache_pc_function_section = section; |
397 | goto return_cached_value; | |
398 | } | |
c906108c SS |
399 | |
400 | msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section); | |
401 | pst = find_pc_sect_psymtab (mapped_pc, section); | |
402 | if (pst) | |
403 | { | |
404 | /* Need to read the symbols to get a good value for the end address. */ | |
405 | if (endaddr != NULL && !pst->readin) | |
406 | { | |
407 | /* Need to get the terminal in case symbol-reading produces | |
408 | output. */ | |
409 | target_terminal_ours_for_output (); | |
410 | PSYMTAB_TO_SYMTAB (pst); | |
411 | } | |
412 | ||
413 | if (pst->readin) | |
414 | { | |
415 | /* Checking whether the msymbol has a larger value is for the | |
416 | "pathological" case mentioned in print_frame_info. */ | |
417 | f = find_pc_sect_function (mapped_pc, section); | |
418 | if (f != NULL | |
419 | && (msymbol == NULL | |
420 | || (BLOCK_START (SYMBOL_BLOCK_VALUE (f)) | |
421 | >= SYMBOL_VALUE_ADDRESS (msymbol)))) | |
422 | { | |
c5aa993b JM |
423 | cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f)); |
424 | cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f)); | |
22abf04a | 425 | cache_pc_function_name = DEPRECATED_SYMBOL_NAME (f); |
c906108c SS |
426 | cache_pc_function_section = section; |
427 | goto return_cached_value; | |
428 | } | |
429 | } | |
430 | else | |
431 | { | |
432 | /* Now that static symbols go in the minimal symbol table, perhaps | |
433 | we could just ignore the partial symbols. But at least for now | |
434 | we use the partial or minimal symbol, whichever is larger. */ | |
435 | psb = find_pc_sect_psymbol (pst, mapped_pc, section); | |
436 | ||
437 | if (psb | |
438 | && (msymbol == NULL || | |
439 | (SYMBOL_VALUE_ADDRESS (psb) | |
440 | >= SYMBOL_VALUE_ADDRESS (msymbol)))) | |
441 | { | |
442 | /* This case isn't being cached currently. */ | |
443 | if (address) | |
444 | *address = SYMBOL_VALUE_ADDRESS (psb); | |
445 | if (name) | |
22abf04a | 446 | *name = DEPRECATED_SYMBOL_NAME (psb); |
c906108c SS |
447 | /* endaddr non-NULL can't happen here. */ |
448 | return 1; | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
453 | /* Not in the normal symbol tables, see if the pc is in a known section. | |
454 | If it's not, then give up. This ensures that anything beyond the end | |
455 | of the text seg doesn't appear to be part of the last function in the | |
456 | text segment. */ | |
457 | ||
458 | osect = find_pc_sect_section (mapped_pc, section); | |
459 | ||
460 | if (!osect) | |
461 | msymbol = NULL; | |
462 | ||
463 | /* Must be in the minimal symbol table. */ | |
464 | if (msymbol == NULL) | |
465 | { | |
466 | /* No available symbol. */ | |
467 | if (name != NULL) | |
468 | *name = 0; | |
469 | if (address != NULL) | |
470 | *address = 0; | |
471 | if (endaddr != NULL) | |
472 | *endaddr = 0; | |
473 | return 0; | |
474 | } | |
475 | ||
c5aa993b | 476 | cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol); |
22abf04a | 477 | cache_pc_function_name = DEPRECATED_SYMBOL_NAME (msymbol); |
c906108c SS |
478 | cache_pc_function_section = section; |
479 | ||
480 | /* Use the lesser of the next minimal symbol in the same section, or | |
481 | the end of the section, as the end of the function. */ | |
c5aa993b | 482 | |
c906108c SS |
483 | /* Step over other symbols at this same address, and symbols in |
484 | other sections, to find the next symbol in this section with | |
485 | a different address. */ | |
486 | ||
22abf04a | 487 | for (i = 1; DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL; i++) |
c906108c | 488 | { |
c5aa993b | 489 | if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol) |
247055de | 490 | && SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol)) |
c906108c SS |
491 | break; |
492 | } | |
493 | ||
22abf04a | 494 | if (DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL |
c906108c SS |
495 | && SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr) |
496 | cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i); | |
497 | else | |
498 | /* We got the start address from the last msymbol in the objfile. | |
499 | So the end address is the end of the section. */ | |
500 | cache_pc_function_high = osect->endaddr; | |
501 | ||
247055de | 502 | return_cached_value: |
c906108c SS |
503 | |
504 | if (address) | |
505 | { | |
506 | if (pc_in_unmapped_range (pc, section)) | |
c5aa993b | 507 | *address = overlay_unmapped_address (cache_pc_function_low, section); |
c906108c | 508 | else |
c5aa993b | 509 | *address = cache_pc_function_low; |
c906108c | 510 | } |
c5aa993b | 511 | |
c906108c SS |
512 | if (name) |
513 | *name = cache_pc_function_name; | |
514 | ||
515 | if (endaddr) | |
516 | { | |
517 | if (pc_in_unmapped_range (pc, section)) | |
c5aa993b | 518 | { |
c906108c SS |
519 | /* Because the high address is actually beyond the end of |
520 | the function (and therefore possibly beyond the end of | |
247055de MK |
521 | the overlay), we must actually convert (high - 1) and |
522 | then add one to that. */ | |
c906108c | 523 | |
c5aa993b | 524 | *endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1, |
c906108c | 525 | section); |
c5aa993b | 526 | } |
c906108c | 527 | else |
c5aa993b | 528 | *endaddr = cache_pc_function_high; |
c906108c SS |
529 | } |
530 | ||
531 | return 1; | |
532 | } | |
533 | ||
c906108c SS |
534 | /* Return the innermost stack frame executing inside of BLOCK, |
535 | or NULL if there is no such frame. If BLOCK is NULL, just return NULL. */ | |
536 | ||
537 | struct frame_info * | |
fba45db2 | 538 | block_innermost_frame (struct block *block) |
c906108c SS |
539 | { |
540 | struct frame_info *frame; | |
52f0bd74 AC |
541 | CORE_ADDR start; |
542 | CORE_ADDR end; | |
42f99ac2 | 543 | CORE_ADDR calling_pc; |
c906108c SS |
544 | |
545 | if (block == NULL) | |
546 | return NULL; | |
547 | ||
548 | start = BLOCK_START (block); | |
549 | end = BLOCK_END (block); | |
550 | ||
551 | frame = NULL; | |
552 | while (1) | |
553 | { | |
554 | frame = get_prev_frame (frame); | |
555 | if (frame == NULL) | |
556 | return NULL; | |
c4a09524 | 557 | calling_pc = get_frame_address_in_block (frame); |
42f99ac2 | 558 | if (calling_pc >= start && calling_pc < end) |
c906108c SS |
559 | return frame; |
560 | } | |
561 | } | |
562 | ||
7a292a7a SS |
563 | /* Are we in a call dummy? The code below which allows DECR_PC_AFTER_BREAK |
564 | below is for infrun.c, which may give the macro a pc without that | |
565 | subtracted out. */ | |
566 | ||
7a292a7a SS |
567 | /* Is the PC in a call dummy? SP and FRAME_ADDRESS are the bottom and |
568 | top of the stack frame which we are checking, where "bottom" and | |
569 | "top" refer to some section of memory which contains the code for | |
570 | the call dummy. Calls to this macro assume that the contents of | |
0ba6dca9 AC |
571 | SP_REGNUM and DEPRECATED_FP_REGNUM (or the saved values thereof), |
572 | respectively, are the things to pass. | |
573 | ||
574 | This won't work on the 29k, where SP_REGNUM and | |
575 | DEPRECATED_FP_REGNUM don't have that meaning, but the 29k doesn't | |
576 | use ON_STACK. This could be fixed by generalizing this scheme, | |
577 | perhaps by passing in a frame and adding a few fields, at least on | |
578 | machines which need them for DEPRECATED_PC_IN_CALL_DUMMY. | |
7a292a7a SS |
579 | |
580 | Something simpler, like checking for the stack segment, doesn't work, | |
581 | since various programs (threads implementations, gcc nested function | |
582 | stubs, etc) may either allocate stack frames in another segment, or | |
583 | allocate other kinds of code on the stack. */ | |
584 | ||
585 | int | |
b4b88177 AC |
586 | deprecated_pc_in_call_dummy_on_stack (CORE_ADDR pc, CORE_ADDR sp, |
587 | CORE_ADDR frame_address) | |
7a292a7a SS |
588 | { |
589 | return (INNER_THAN ((sp), (pc)) | |
590 | && (frame_address != 0) | |
591 | && INNER_THAN ((pc), (frame_address))); | |
592 | } | |
593 | ||
e6ba3bc9 AC |
594 | /* Returns true for a user frame or a call_function_by_hand dummy |
595 | frame, and false for the CRT0 start-up frame. Purpose is to | |
596 | terminate backtrace. */ | |
c5aa993b | 597 | |
c906108c | 598 | int |
e6ba3bc9 | 599 | legacy_frame_chain_valid (CORE_ADDR fp, struct frame_info *fi) |
c906108c | 600 | { |
51603483 DJ |
601 | /* Don't prune CALL_DUMMY frames. */ |
602 | if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES | |
603 | && DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0)) | |
604 | return 1; | |
605 | ||
606 | /* If the new frame pointer is zero, then it isn't valid. */ | |
607 | if (fp == 0) | |
608 | return 0; | |
609 | ||
610 | /* If the new frame would be inside (younger than) the previous frame, | |
611 | then it isn't valid. */ | |
612 | if (INNER_THAN (fp, get_frame_base (fi))) | |
613 | return 0; | |
614 | ||
7c86889b CV |
615 | /* If the architecture has a custom DEPRECATED_FRAME_CHAIN_VALID, |
616 | call it now. */ | |
617 | if (DEPRECATED_FRAME_CHAIN_VALID_P ()) | |
618 | return DEPRECATED_FRAME_CHAIN_VALID (fp, fi); | |
619 | ||
51603483 DJ |
620 | /* If we're already inside the entry function for the main objfile, then it |
621 | isn't valid. */ | |
6e4c6c91 | 622 | if (legacy_inside_entry_func (get_frame_pc (fi))) |
51603483 DJ |
623 | return 0; |
624 | ||
625 | /* If we're inside the entry file, it isn't valid. */ | |
626 | /* NOTE/drow 2002-12-25: should there be a way to disable this check? It | |
627 | assumes a single small entry file, and the way some debug readers (e.g. | |
628 | dbxread) figure out which object is the entry file is somewhat hokey. */ | |
627b3ba2 | 629 | if (deprecated_inside_entry_file (frame_pc_unwind (fi))) |
51603483 DJ |
630 | return 0; |
631 | ||
51603483 | 632 | return 1; |
c906108c | 633 | } |