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c906108c SS |
1 | /* GDB routines for manipulating objfiles. |
2 | Copyright 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
3 | Contributed by Cygnus Support, using pieces from other GDB modules. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | /* This file contains support routines for creating, manipulating, and | |
22 | destroying objfile structures. */ | |
23 | ||
24 | #include "defs.h" | |
25 | #include "bfd.h" /* Binary File Description */ | |
26 | #include "symtab.h" | |
27 | #include "symfile.h" | |
28 | #include "objfiles.h" | |
29 | #include "gdb-stabs.h" | |
30 | #include "target.h" | |
31 | ||
32 | #include <sys/types.h> | |
33 | #include "gdb_stat.h" | |
34 | #include <fcntl.h> | |
35 | #include "obstack.h" | |
36 | #include "gdb_string.h" | |
37 | ||
38 | /* Prototypes for local functions */ | |
39 | ||
40 | #if defined(USE_MMALLOC) && defined(HAVE_MMAP) | |
41 | ||
42 | static int | |
43 | open_existing_mapped_file PARAMS ((char *, long, int)); | |
44 | ||
45 | static int | |
46 | open_mapped_file PARAMS ((char *filename, long mtime, int mapped)); | |
47 | ||
48 | static PTR | |
49 | map_to_file PARAMS ((int)); | |
50 | ||
51 | #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ | |
52 | ||
53 | static void | |
54 | add_to_objfile_sections PARAMS ((bfd *, sec_ptr, PTR)); | |
55 | ||
56 | /* Externally visible variables that are owned by this module. | |
57 | See declarations in objfile.h for more info. */ | |
58 | ||
59 | struct objfile *object_files; /* Linked list of all objfiles */ | |
60 | struct objfile *current_objfile; /* For symbol file being read in */ | |
61 | struct objfile *symfile_objfile; /* Main symbol table loaded from */ | |
62 | struct objfile *rt_common_objfile; /* For runtime common symbols */ | |
63 | ||
64 | int mapped_symbol_files; /* Try to use mapped symbol files */ | |
65 | ||
66 | /* Locate all mappable sections of a BFD file. | |
67 | objfile_p_char is a char * to get it through | |
68 | bfd_map_over_sections; we cast it back to its proper type. */ | |
69 | ||
70 | #ifndef TARGET_KEEP_SECTION | |
71 | #define TARGET_KEEP_SECTION(ASECT) 0 | |
72 | #endif | |
73 | ||
74 | static void | |
75 | add_to_objfile_sections (abfd, asect, objfile_p_char) | |
76 | bfd *abfd; | |
77 | sec_ptr asect; | |
78 | PTR objfile_p_char; | |
79 | { | |
80 | struct objfile *objfile = (struct objfile *) objfile_p_char; | |
81 | struct obj_section section; | |
82 | flagword aflag; | |
83 | ||
84 | aflag = bfd_get_section_flags (abfd, asect); | |
85 | ||
86 | if (!(aflag & SEC_ALLOC) && !(TARGET_KEEP_SECTION(asect))) | |
87 | return; | |
88 | ||
89 | if (0 == bfd_section_size (abfd, asect)) | |
90 | return; | |
91 | section.offset = 0; | |
92 | section.objfile = objfile; | |
93 | section.the_bfd_section = asect; | |
94 | section.ovly_mapped = 0; | |
95 | section.addr = bfd_section_vma (abfd, asect); | |
96 | section.endaddr = section.addr + bfd_section_size (abfd, asect); | |
97 | obstack_grow (&objfile->psymbol_obstack, (char *) §ion, sizeof(section)); | |
98 | objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1); | |
99 | } | |
100 | ||
101 | /* Builds a section table for OBJFILE. | |
102 | Returns 0 if OK, 1 on error (in which case bfd_error contains the | |
103 | error). */ | |
104 | ||
105 | int | |
106 | build_objfile_section_table (objfile) | |
107 | struct objfile *objfile; | |
108 | { | |
109 | /* objfile->sections can be already set when reading a mapped symbol | |
110 | file. I believe that we do need to rebuild the section table in | |
111 | this case (we rebuild other things derived from the bfd), but we | |
112 | can't free the old one (it's in the psymbol_obstack). So we just | |
113 | waste some memory. */ | |
114 | ||
115 | objfile->sections_end = 0; | |
116 | bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *)objfile); | |
117 | objfile->sections = (struct obj_section *) | |
118 | obstack_finish (&objfile->psymbol_obstack); | |
119 | objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end; | |
120 | return(0); | |
121 | } | |
122 | ||
123 | /* Given a pointer to an initialized bfd (ABFD) and a flag that indicates | |
124 | whether or not an objfile is to be mapped (MAPPED), allocate a new objfile | |
125 | struct, fill it in as best we can, link it into the list of all known | |
126 | objfiles, and return a pointer to the new objfile struct. | |
127 | ||
128 | USER_LOADED is simply recorded in the objfile. This record offers a way for | |
129 | run_command to remove old objfile entries which are no longer valid (i.e., | |
130 | are associated with an old inferior), but to preserve ones that the user | |
131 | explicitly loaded via the add-symbol-file command. | |
132 | ||
133 | IS_SOLIB is also simply recorded in the objfile. */ | |
134 | ||
135 | struct objfile * | |
136 | allocate_objfile (abfd, mapped, user_loaded, is_solib) | |
137 | bfd *abfd; | |
138 | int mapped; | |
139 | int user_loaded; | |
140 | int is_solib; | |
141 | { | |
142 | struct objfile *objfile = NULL; | |
143 | struct objfile *last_one = NULL; | |
144 | ||
145 | mapped |= mapped_symbol_files; | |
146 | ||
147 | #if defined(USE_MMALLOC) && defined(HAVE_MMAP) | |
148 | if (abfd != NULL) | |
149 | { | |
150 | ||
151 | /* If we can support mapped symbol files, try to open/reopen the | |
152 | mapped file that corresponds to the file from which we wish to | |
153 | read symbols. If the objfile is to be mapped, we must malloc | |
154 | the structure itself using the mmap version, and arrange that | |
155 | all memory allocation for the objfile uses the mmap routines. | |
156 | If we are reusing an existing mapped file, from which we get | |
157 | our objfile pointer, we have to make sure that we update the | |
158 | pointers to the alloc/free functions in the obstack, in case | |
159 | these functions have moved within the current gdb. */ | |
160 | ||
161 | int fd; | |
162 | ||
163 | fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd), | |
164 | mapped); | |
165 | if (fd >= 0) | |
166 | { | |
167 | PTR md; | |
168 | ||
169 | if ((md = map_to_file (fd)) == NULL) | |
170 | { | |
171 | close (fd); | |
172 | } | |
173 | else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL) | |
174 | { | |
175 | /* Update memory corruption handler function addresses. */ | |
176 | init_malloc (md); | |
177 | objfile -> md = md; | |
178 | objfile -> mmfd = fd; | |
179 | /* Update pointers to functions to *our* copies */ | |
180 | obstack_chunkfun (&objfile -> psymbol_cache.cache, xmmalloc); | |
181 | obstack_freefun (&objfile -> psymbol_cache.cache, mfree); | |
182 | obstack_chunkfun (&objfile -> psymbol_obstack, xmmalloc); | |
183 | obstack_freefun (&objfile -> psymbol_obstack, mfree); | |
184 | obstack_chunkfun (&objfile -> symbol_obstack, xmmalloc); | |
185 | obstack_freefun (&objfile -> symbol_obstack, mfree); | |
186 | obstack_chunkfun (&objfile -> type_obstack, xmmalloc); | |
187 | obstack_freefun (&objfile -> type_obstack, mfree); | |
188 | /* If already in objfile list, unlink it. */ | |
189 | unlink_objfile (objfile); | |
190 | /* Forget things specific to a particular gdb, may have changed. */ | |
191 | objfile -> sf = NULL; | |
192 | } | |
193 | else | |
194 | { | |
195 | ||
196 | /* Set up to detect internal memory corruption. MUST be | |
197 | done before the first malloc. See comments in | |
198 | init_malloc() and mmcheck(). */ | |
199 | ||
200 | init_malloc (md); | |
201 | ||
202 | objfile = (struct objfile *) | |
203 | xmmalloc (md, sizeof (struct objfile)); | |
204 | memset (objfile, 0, sizeof (struct objfile)); | |
205 | objfile -> md = md; | |
206 | objfile -> mmfd = fd; | |
207 | objfile -> flags |= OBJF_MAPPED; | |
208 | mmalloc_setkey (objfile -> md, 0, objfile); | |
209 | obstack_specify_allocation_with_arg (&objfile -> psymbol_cache.cache, | |
210 | 0, 0, xmmalloc, mfree, | |
211 | objfile -> md); | |
212 | obstack_specify_allocation_with_arg (&objfile -> psymbol_obstack, | |
213 | 0, 0, xmmalloc, mfree, | |
214 | objfile -> md); | |
215 | obstack_specify_allocation_with_arg (&objfile -> symbol_obstack, | |
216 | 0, 0, xmmalloc, mfree, | |
217 | objfile -> md); | |
218 | obstack_specify_allocation_with_arg (&objfile -> type_obstack, | |
219 | 0, 0, xmmalloc, mfree, | |
220 | objfile -> md); | |
221 | } | |
222 | } | |
223 | ||
224 | if (mapped && (objfile == NULL)) | |
225 | { | |
226 | warning ("symbol table for '%s' will not be mapped", | |
227 | bfd_get_filename (abfd)); | |
228 | } | |
229 | } | |
230 | #else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */ | |
231 | ||
232 | if (mapped) | |
233 | { | |
234 | warning ("mapped symbol tables are not supported on this machine; missing or broken mmap()."); | |
235 | ||
236 | /* Turn off the global flag so we don't try to do mapped symbol tables | |
237 | any more, which shuts up gdb unless the user specifically gives the | |
238 | "mapped" keyword again. */ | |
239 | ||
240 | mapped_symbol_files = 0; | |
241 | } | |
242 | ||
243 | #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ | |
244 | ||
245 | /* If we don't support mapped symbol files, didn't ask for the file to be | |
246 | mapped, or failed to open the mapped file for some reason, then revert | |
247 | back to an unmapped objfile. */ | |
248 | ||
249 | if (objfile == NULL) | |
250 | { | |
251 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
252 | memset (objfile, 0, sizeof (struct objfile)); | |
253 | objfile -> md = NULL; | |
254 | obstack_specify_allocation (&objfile -> psymbol_cache.cache, 0, 0, | |
255 | xmalloc, free); | |
256 | obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc, | |
257 | free); | |
258 | obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc, | |
259 | free); | |
260 | obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc, | |
261 | free); | |
262 | } | |
263 | ||
264 | /* Update the per-objfile information that comes from the bfd, ensuring | |
265 | that any data that is reference is saved in the per-objfile data | |
266 | region. */ | |
267 | ||
268 | objfile -> obfd = abfd; | |
269 | if (objfile -> name != NULL) | |
270 | { | |
271 | mfree (objfile -> md, objfile -> name); | |
272 | } | |
273 | if (abfd != NULL) | |
274 | { | |
275 | objfile -> name = mstrsave (objfile -> md, bfd_get_filename (abfd)); | |
276 | objfile -> mtime = bfd_get_mtime (abfd); | |
277 | ||
278 | /* Build section table. */ | |
279 | ||
280 | if (build_objfile_section_table (objfile)) | |
281 | { | |
282 | error ("Can't find the file sections in `%s': %s", | |
283 | objfile -> name, bfd_errmsg (bfd_get_error ())); | |
284 | } | |
285 | } | |
286 | ||
287 | /* Add this file onto the tail of the linked list of other such files. */ | |
288 | ||
289 | objfile -> next = NULL; | |
290 | if (object_files == NULL) | |
291 | object_files = objfile; | |
292 | else | |
293 | { | |
294 | for (last_one = object_files; | |
295 | last_one -> next; | |
296 | last_one = last_one -> next); | |
297 | last_one -> next = objfile; | |
298 | } | |
299 | ||
300 | /* Record whether this objfile was created because the user explicitly | |
301 | caused it (e.g., used the add-symbol-file command). | |
302 | */ | |
303 | objfile -> user_loaded = user_loaded; | |
304 | ||
305 | /* Record whether this objfile definitely represents a solib. */ | |
306 | objfile -> is_solib = is_solib; | |
307 | ||
308 | return (objfile); | |
309 | } | |
310 | ||
311 | /* Put OBJFILE at the front of the list. */ | |
312 | ||
313 | void | |
314 | objfile_to_front (objfile) | |
315 | struct objfile *objfile; | |
316 | { | |
317 | struct objfile **objp; | |
318 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
319 | { | |
320 | if (*objp == objfile) | |
321 | { | |
322 | /* Unhook it from where it is. */ | |
323 | *objp = objfile->next; | |
324 | /* Put it in the front. */ | |
325 | objfile->next = object_files; | |
326 | object_files = objfile; | |
327 | break; | |
328 | } | |
329 | } | |
330 | } | |
331 | ||
332 | /* Unlink OBJFILE from the list of known objfiles, if it is found in the | |
333 | list. | |
334 | ||
335 | It is not a bug, or error, to call this function if OBJFILE is not known | |
336 | to be in the current list. This is done in the case of mapped objfiles, | |
337 | for example, just to ensure that the mapped objfile doesn't appear twice | |
338 | in the list. Since the list is threaded, linking in a mapped objfile | |
339 | twice would create a circular list. | |
340 | ||
341 | If OBJFILE turns out to be in the list, we zap it's NEXT pointer after | |
342 | unlinking it, just to ensure that we have completely severed any linkages | |
343 | between the OBJFILE and the list. */ | |
344 | ||
345 | void | |
346 | unlink_objfile (objfile) | |
347 | struct objfile *objfile; | |
348 | { | |
349 | struct objfile** objpp; | |
350 | ||
351 | for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp) -> next)) | |
352 | { | |
353 | if (*objpp == objfile) | |
354 | { | |
355 | *objpp = (*objpp) -> next; | |
356 | objfile -> next = NULL; | |
357 | break; | |
358 | } | |
359 | } | |
360 | } | |
361 | ||
362 | ||
363 | /* Destroy an objfile and all the symtabs and psymtabs under it. Note | |
364 | that as much as possible is allocated on the symbol_obstack and | |
365 | psymbol_obstack, so that the memory can be efficiently freed. | |
366 | ||
367 | Things which we do NOT free because they are not in malloc'd memory | |
368 | or not in memory specific to the objfile include: | |
369 | ||
370 | objfile -> sf | |
371 | ||
372 | FIXME: If the objfile is using reusable symbol information (via mmalloc), | |
373 | then we need to take into account the fact that more than one process | |
374 | may be using the symbol information at the same time (when mmalloc is | |
375 | extended to support cooperative locking). When more than one process | |
376 | is using the mapped symbol info, we need to be more careful about when | |
377 | we free objects in the reusable area. */ | |
378 | ||
379 | void | |
380 | free_objfile (objfile) | |
381 | struct objfile *objfile; | |
382 | { | |
383 | /* First do any symbol file specific actions required when we are | |
384 | finished with a particular symbol file. Note that if the objfile | |
385 | is using reusable symbol information (via mmalloc) then each of | |
386 | these routines is responsible for doing the correct thing, either | |
387 | freeing things which are valid only during this particular gdb | |
388 | execution, or leaving them to be reused during the next one. */ | |
389 | ||
390 | if (objfile -> sf != NULL) | |
391 | { | |
392 | (*objfile -> sf -> sym_finish) (objfile); | |
393 | } | |
394 | ||
395 | /* We always close the bfd. */ | |
396 | ||
397 | if (objfile -> obfd != NULL) | |
398 | { | |
399 | char *name = bfd_get_filename (objfile->obfd); | |
400 | if (!bfd_close (objfile -> obfd)) | |
401 | warning ("cannot close \"%s\": %s", | |
402 | name, bfd_errmsg (bfd_get_error ())); | |
403 | free (name); | |
404 | } | |
405 | ||
406 | /* Remove it from the chain of all objfiles. */ | |
407 | ||
408 | unlink_objfile (objfile); | |
409 | ||
410 | /* If we are going to free the runtime common objfile, mark it | |
411 | as unallocated. */ | |
412 | ||
413 | if (objfile == rt_common_objfile) | |
414 | rt_common_objfile = NULL; | |
415 | ||
416 | /* Before the symbol table code was redone to make it easier to | |
417 | selectively load and remove information particular to a specific | |
418 | linkage unit, gdb used to do these things whenever the monolithic | |
419 | symbol table was blown away. How much still needs to be done | |
420 | is unknown, but we play it safe for now and keep each action until | |
421 | it is shown to be no longer needed. */ | |
422 | ||
423 | #if defined (CLEAR_SOLIB) | |
424 | CLEAR_SOLIB (); | |
425 | /* CLEAR_SOLIB closes the bfd's for any shared libraries. But | |
426 | the to_sections for a core file might refer to those bfd's. So | |
427 | detach any core file. */ | |
428 | { | |
429 | struct target_ops *t = find_core_target (); | |
430 | if (t != NULL) | |
431 | (t->to_detach) (NULL, 0); | |
432 | } | |
433 | #endif | |
434 | /* I *think* all our callers call clear_symtab_users. If so, no need | |
435 | to call this here. */ | |
436 | clear_pc_function_cache (); | |
437 | ||
438 | /* The last thing we do is free the objfile struct itself for the | |
439 | non-reusable case, or detach from the mapped file for the reusable | |
440 | case. Note that the mmalloc_detach or the mfree is the last thing | |
441 | we can do with this objfile. */ | |
442 | ||
443 | #if defined(USE_MMALLOC) && defined(HAVE_MMAP) | |
444 | ||
445 | if (objfile -> flags & OBJF_MAPPED) | |
446 | { | |
447 | /* Remember the fd so we can close it. We can't close it before | |
448 | doing the detach, and after the detach the objfile is gone. */ | |
449 | int mmfd; | |
450 | ||
451 | mmfd = objfile -> mmfd; | |
452 | mmalloc_detach (objfile -> md); | |
453 | objfile = NULL; | |
454 | close (mmfd); | |
455 | } | |
456 | ||
457 | #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ | |
458 | ||
459 | /* If we still have an objfile, then either we don't support reusable | |
460 | objfiles or this one was not reusable. So free it normally. */ | |
461 | ||
462 | if (objfile != NULL) | |
463 | { | |
464 | if (objfile -> name != NULL) | |
465 | { | |
466 | mfree (objfile -> md, objfile -> name); | |
467 | } | |
468 | if (objfile->global_psymbols.list) | |
469 | mfree (objfile->md, objfile->global_psymbols.list); | |
470 | if (objfile->static_psymbols.list) | |
471 | mfree (objfile->md, objfile->static_psymbols.list); | |
472 | /* Free the obstacks for non-reusable objfiles */ | |
473 | obstack_free (&objfile -> psymbol_cache.cache, 0); | |
474 | obstack_free (&objfile -> psymbol_obstack, 0); | |
475 | obstack_free (&objfile -> symbol_obstack, 0); | |
476 | obstack_free (&objfile -> type_obstack, 0); | |
477 | mfree (objfile -> md, objfile); | |
478 | objfile = NULL; | |
479 | } | |
480 | } | |
481 | ||
482 | ||
483 | /* Free all the object files at once and clean up their users. */ | |
484 | ||
485 | void | |
486 | free_all_objfiles () | |
487 | { | |
488 | struct objfile *objfile, *temp; | |
489 | ||
490 | ALL_OBJFILES_SAFE (objfile, temp) | |
491 | { | |
492 | free_objfile (objfile); | |
493 | } | |
494 | clear_symtab_users (); | |
495 | } | |
496 | \f | |
497 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS | |
498 | entries in new_offsets. */ | |
499 | void | |
500 | objfile_relocate (objfile, new_offsets) | |
501 | struct objfile *objfile; | |
502 | struct section_offsets *new_offsets; | |
503 | { | |
504 | struct section_offsets *delta = (struct section_offsets *) | |
505 | alloca (sizeof (struct section_offsets) | |
506 | + objfile->num_sections * sizeof (delta->offsets)); | |
507 | ||
508 | { | |
509 | int i; | |
510 | int something_changed = 0; | |
511 | for (i = 0; i < objfile->num_sections; ++i) | |
512 | { | |
513 | ANOFFSET (delta, i) = | |
514 | ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i); | |
515 | if (ANOFFSET (delta, i) != 0) | |
516 | something_changed = 1; | |
517 | } | |
518 | if (!something_changed) | |
519 | return; | |
520 | } | |
521 | ||
522 | /* OK, get all the symtabs. */ | |
523 | { | |
524 | struct symtab *s; | |
525 | ||
526 | ALL_OBJFILE_SYMTABS (objfile, s) | |
527 | { | |
528 | struct linetable *l; | |
529 | struct blockvector *bv; | |
530 | int i; | |
531 | ||
532 | /* First the line table. */ | |
533 | l = LINETABLE (s); | |
534 | if (l) | |
535 | { | |
536 | for (i = 0; i < l->nitems; ++i) | |
537 | l->item[i].pc += ANOFFSET (delta, s->block_line_section); | |
538 | } | |
539 | ||
540 | /* Don't relocate a shared blockvector more than once. */ | |
541 | if (!s->primary) | |
542 | continue; | |
543 | ||
544 | bv = BLOCKVECTOR (s); | |
545 | for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i) | |
546 | { | |
547 | struct block *b; | |
548 | int j; | |
549 | ||
550 | b = BLOCKVECTOR_BLOCK (bv, i); | |
551 | BLOCK_START (b) += ANOFFSET (delta, s->block_line_section); | |
552 | BLOCK_END (b) += ANOFFSET (delta, s->block_line_section); | |
553 | ||
554 | for (j = 0; j < BLOCK_NSYMS (b); ++j) | |
555 | { | |
556 | struct symbol *sym = BLOCK_SYM (b, j); | |
557 | /* The RS6000 code from which this was taken skipped | |
558 | any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE. | |
559 | But I'm leaving out that test, on the theory that | |
560 | they can't possibly pass the tests below. */ | |
561 | if ((SYMBOL_CLASS (sym) == LOC_LABEL | |
562 | || SYMBOL_CLASS (sym) == LOC_STATIC | |
563 | || SYMBOL_CLASS (sym) == LOC_INDIRECT) | |
564 | && SYMBOL_SECTION (sym) >= 0) | |
565 | { | |
566 | SYMBOL_VALUE_ADDRESS (sym) += | |
567 | ANOFFSET (delta, SYMBOL_SECTION (sym)); | |
568 | } | |
569 | #ifdef MIPS_EFI_SYMBOL_NAME | |
570 | /* Relocate Extra Function Info for ecoff. */ | |
571 | ||
572 | else | |
573 | if (SYMBOL_CLASS (sym) == LOC_CONST | |
574 | && SYMBOL_NAMESPACE (sym) == LABEL_NAMESPACE | |
575 | && STRCMP (SYMBOL_NAME (sym), MIPS_EFI_SYMBOL_NAME) == 0) | |
576 | ecoff_relocate_efi (sym, ANOFFSET (delta, | |
577 | s->block_line_section)); | |
578 | #endif | |
579 | } | |
580 | } | |
581 | } | |
582 | } | |
583 | ||
584 | { | |
585 | struct partial_symtab *p; | |
586 | ||
587 | ALL_OBJFILE_PSYMTABS (objfile, p) | |
588 | { | |
589 | p->textlow += ANOFFSET (delta, SECT_OFF_TEXT); | |
590 | p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT); | |
591 | } | |
592 | } | |
593 | ||
594 | { | |
595 | struct partial_symbol **psym; | |
596 | ||
597 | for (psym = objfile->global_psymbols.list; | |
598 | psym < objfile->global_psymbols.next; | |
599 | psym++) | |
600 | if (SYMBOL_SECTION (*psym) >= 0) | |
601 | SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta, | |
602 | SYMBOL_SECTION (*psym)); | |
603 | for (psym = objfile->static_psymbols.list; | |
604 | psym < objfile->static_psymbols.next; | |
605 | psym++) | |
606 | if (SYMBOL_SECTION (*psym) >= 0) | |
607 | SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta, | |
608 | SYMBOL_SECTION (*psym)); | |
609 | } | |
610 | ||
611 | { | |
612 | struct minimal_symbol *msym; | |
613 | ALL_OBJFILE_MSYMBOLS (objfile, msym) | |
614 | if (SYMBOL_SECTION (msym) >= 0) | |
615 | SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym)); | |
616 | } | |
617 | /* Relocating different sections by different amounts may cause the symbols | |
618 | to be out of order. */ | |
619 | msymbols_sort (objfile); | |
620 | ||
621 | { | |
622 | int i; | |
623 | for (i = 0; i < objfile->num_sections; ++i) | |
624 | ANOFFSET (objfile->section_offsets, i) = ANOFFSET (new_offsets, i); | |
625 | } | |
626 | ||
627 | { | |
628 | struct obj_section *s; | |
629 | bfd *abfd; | |
630 | ||
631 | abfd = objfile->obfd; | |
632 | ||
633 | for (s = objfile->sections; | |
634 | s < objfile->sections_end; ++s) | |
635 | { | |
636 | flagword flags; | |
637 | ||
638 | flags = bfd_get_section_flags (abfd, s->the_bfd_section); | |
639 | ||
640 | if (flags & SEC_CODE) | |
641 | { | |
642 | s->addr += ANOFFSET (delta, SECT_OFF_TEXT); | |
643 | s->endaddr += ANOFFSET (delta, SECT_OFF_TEXT); | |
644 | } | |
645 | else if (flags & (SEC_DATA | SEC_LOAD)) | |
646 | { | |
647 | s->addr += ANOFFSET (delta, SECT_OFF_DATA); | |
648 | s->endaddr += ANOFFSET (delta, SECT_OFF_DATA); | |
649 | } | |
650 | else if (flags & SEC_ALLOC) | |
651 | { | |
652 | s->addr += ANOFFSET (delta, SECT_OFF_BSS); | |
653 | s->endaddr += ANOFFSET (delta, SECT_OFF_BSS); | |
654 | } | |
655 | } | |
656 | } | |
657 | ||
658 | if (objfile->ei.entry_point != ~(CORE_ADDR)0) | |
659 | objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT); | |
660 | ||
661 | if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC) | |
662 | { | |
663 | objfile->ei.entry_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT); | |
664 | objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT); | |
665 | } | |
666 | ||
667 | if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC) | |
668 | { | |
669 | objfile->ei.entry_file_lowpc += ANOFFSET (delta, SECT_OFF_TEXT); | |
670 | objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT); | |
671 | } | |
672 | ||
673 | if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC) | |
674 | { | |
675 | objfile->ei.main_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT); | |
676 | objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT); | |
677 | } | |
678 | ||
679 | /* Relocate breakpoints as necessary, after things are relocated. */ | |
680 | breakpoint_re_set (); | |
681 | } | |
682 | \f | |
683 | /* Many places in gdb want to test just to see if we have any partial | |
684 | symbols available. This function returns zero if none are currently | |
685 | available, nonzero otherwise. */ | |
686 | ||
687 | int | |
688 | have_partial_symbols () | |
689 | { | |
690 | struct objfile *ofp; | |
691 | ||
692 | ALL_OBJFILES (ofp) | |
693 | { | |
694 | if (ofp -> psymtabs != NULL) | |
695 | { | |
696 | return 1; | |
697 | } | |
698 | } | |
699 | return 0; | |
700 | } | |
701 | ||
702 | /* Many places in gdb want to test just to see if we have any full | |
703 | symbols available. This function returns zero if none are currently | |
704 | available, nonzero otherwise. */ | |
705 | ||
706 | int | |
707 | have_full_symbols () | |
708 | { | |
709 | struct objfile *ofp; | |
710 | ||
711 | ALL_OBJFILES (ofp) | |
712 | { | |
713 | if (ofp -> symtabs != NULL) | |
714 | { | |
715 | return 1; | |
716 | } | |
717 | } | |
718 | return 0; | |
719 | } | |
720 | ||
721 | ||
722 | /* This operations deletes all objfile entries that represent solibs that | |
723 | weren't explicitly loaded by the user, via e.g., the add-symbol-file | |
724 | command. | |
725 | */ | |
726 | void | |
727 | objfile_purge_solibs () | |
728 | { | |
729 | struct objfile * objf; | |
730 | struct objfile * temp; | |
731 | ||
732 | ALL_OBJFILES_SAFE (objf, temp) | |
733 | { | |
734 | /* We assume that the solib package has been purged already, or will | |
735 | be soon. | |
736 | */ | |
737 | if (! objf->user_loaded && objf->is_solib) | |
738 | free_objfile (objf); | |
739 | } | |
740 | } | |
741 | ||
742 | ||
743 | /* Many places in gdb want to test just to see if we have any minimal | |
744 | symbols available. This function returns zero if none are currently | |
745 | available, nonzero otherwise. */ | |
746 | ||
747 | int | |
748 | have_minimal_symbols () | |
749 | { | |
750 | struct objfile *ofp; | |
751 | ||
752 | ALL_OBJFILES (ofp) | |
753 | { | |
754 | if (ofp -> msymbols != NULL) | |
755 | { | |
756 | return 1; | |
757 | } | |
758 | } | |
759 | return 0; | |
760 | } | |
761 | ||
762 | #if defined(USE_MMALLOC) && defined(HAVE_MMAP) | |
763 | ||
764 | /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp | |
765 | of the corresponding symbol file in MTIME, try to open an existing file | |
766 | with the name SYMSFILENAME and verify it is more recent than the base | |
767 | file by checking it's timestamp against MTIME. | |
768 | ||
769 | If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1. | |
770 | ||
771 | If SYMSFILENAME does exist, but is out of date, we check to see if the | |
772 | user has specified creation of a mapped file. If so, we don't issue | |
773 | any warning message because we will be creating a new mapped file anyway, | |
774 | overwriting the old one. If not, then we issue a warning message so that | |
775 | the user will know why we aren't using this existing mapped symbol file. | |
776 | In either case, we return -1. | |
777 | ||
778 | If SYMSFILENAME does exist and is not out of date, but can't be opened for | |
779 | some reason, then prints an appropriate system error message and returns -1. | |
780 | ||
781 | Otherwise, returns the open file descriptor. */ | |
782 | ||
783 | static int | |
784 | open_existing_mapped_file (symsfilename, mtime, mapped) | |
785 | char *symsfilename; | |
786 | long mtime; | |
787 | int mapped; | |
788 | { | |
789 | int fd = -1; | |
790 | struct stat sbuf; | |
791 | ||
792 | if (stat (symsfilename, &sbuf) == 0) | |
793 | { | |
794 | if (sbuf.st_mtime < mtime) | |
795 | { | |
796 | if (!mapped) | |
797 | { | |
798 | warning ("mapped symbol file `%s' is out of date, ignored it", | |
799 | symsfilename); | |
800 | } | |
801 | } | |
802 | else if ((fd = open (symsfilename, O_RDWR)) < 0) | |
803 | { | |
804 | if (error_pre_print) | |
805 | { | |
806 | printf_unfiltered (error_pre_print); | |
807 | } | |
808 | print_sys_errmsg (symsfilename, errno); | |
809 | } | |
810 | } | |
811 | return (fd); | |
812 | } | |
813 | ||
814 | /* Look for a mapped symbol file that corresponds to FILENAME and is more | |
815 | recent than MTIME. If MAPPED is nonzero, the user has asked that gdb | |
816 | use a mapped symbol file for this file, so create a new one if one does | |
817 | not currently exist. | |
818 | ||
819 | If found, then return an open file descriptor for the file, otherwise | |
820 | return -1. | |
821 | ||
822 | This routine is responsible for implementing the policy that generates | |
823 | the name of the mapped symbol file from the name of a file containing | |
824 | symbols that gdb would like to read. Currently this policy is to append | |
825 | ".syms" to the name of the file. | |
826 | ||
827 | This routine is also responsible for implementing the policy that | |
828 | determines where the mapped symbol file is found (the search path). | |
829 | This policy is that when reading an existing mapped file, a file of | |
830 | the correct name in the current directory takes precedence over a | |
831 | file of the correct name in the same directory as the symbol file. | |
832 | When creating a new mapped file, it is always created in the current | |
833 | directory. This helps to minimize the chances of a user unknowingly | |
834 | creating big mapped files in places like /bin and /usr/local/bin, and | |
835 | allows a local copy to override a manually installed global copy (in | |
836 | /bin for example). */ | |
837 | ||
838 | static int | |
839 | open_mapped_file (filename, mtime, mapped) | |
840 | char *filename; | |
841 | long mtime; | |
842 | int mapped; | |
843 | { | |
844 | int fd; | |
845 | char *symsfilename; | |
846 | ||
847 | /* First try to open an existing file in the current directory, and | |
848 | then try the directory where the symbol file is located. */ | |
849 | ||
850 | symsfilename = concat ("./", basename (filename), ".syms", (char *) NULL); | |
851 | if ((fd = open_existing_mapped_file (symsfilename, mtime, mapped)) < 0) | |
852 | { | |
853 | free (symsfilename); | |
854 | symsfilename = concat (filename, ".syms", (char *) NULL); | |
855 | fd = open_existing_mapped_file (symsfilename, mtime, mapped); | |
856 | } | |
857 | ||
858 | /* If we don't have an open file by now, then either the file does not | |
859 | already exist, or the base file has changed since it was created. In | |
860 | either case, if the user has specified use of a mapped file, then | |
861 | create a new mapped file, truncating any existing one. If we can't | |
862 | create one, print a system error message saying why we can't. | |
863 | ||
864 | By default the file is rw for everyone, with the user's umask taking | |
865 | care of turning off the permissions the user wants off. */ | |
866 | ||
867 | if ((fd < 0) && mapped) | |
868 | { | |
869 | free (symsfilename); | |
870 | symsfilename = concat ("./", basename (filename), ".syms", | |
871 | (char *) NULL); | |
872 | if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0) | |
873 | { | |
874 | if (error_pre_print) | |
875 | { | |
876 | printf_unfiltered (error_pre_print); | |
877 | } | |
878 | print_sys_errmsg (symsfilename, errno); | |
879 | } | |
880 | } | |
881 | ||
882 | free (symsfilename); | |
883 | return (fd); | |
884 | } | |
885 | ||
886 | static PTR | |
887 | map_to_file (fd) | |
888 | int fd; | |
889 | { | |
890 | PTR md; | |
891 | CORE_ADDR mapto; | |
892 | ||
893 | md = mmalloc_attach (fd, (PTR) 0); | |
894 | if (md != NULL) | |
895 | { | |
896 | mapto = (CORE_ADDR) mmalloc_getkey (md, 1); | |
897 | md = mmalloc_detach (md); | |
898 | if (md != NULL) | |
899 | { | |
900 | /* FIXME: should figure out why detach failed */ | |
901 | md = NULL; | |
902 | } | |
903 | else if (mapto != (CORE_ADDR) NULL) | |
904 | { | |
905 | /* This mapping file needs to be remapped at "mapto" */ | |
906 | md = mmalloc_attach (fd, (PTR) mapto); | |
907 | } | |
908 | else | |
909 | { | |
910 | /* This is a freshly created mapping file. */ | |
911 | mapto = (CORE_ADDR) mmalloc_findbase (20 * 1024 * 1024); | |
912 | if (mapto != 0) | |
913 | { | |
914 | /* To avoid reusing the freshly created mapping file, at the | |
915 | address selected by mmap, we must truncate it before trying | |
916 | to do an attach at the address we want. */ | |
917 | ftruncate (fd, 0); | |
918 | md = mmalloc_attach (fd, (PTR) mapto); | |
919 | if (md != NULL) | |
920 | { | |
921 | mmalloc_setkey (md, 1, (PTR) mapto); | |
922 | } | |
923 | } | |
924 | } | |
925 | } | |
926 | return (md); | |
927 | } | |
928 | ||
929 | #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ | |
930 | ||
931 | /* Returns a section whose range includes PC and SECTION, | |
932 | or NULL if none found. Note the distinction between the return type, | |
933 | struct obj_section (which is defined in gdb), and the input type | |
934 | struct sec (which is a bfd-defined data type). The obj_section | |
935 | contains a pointer to the bfd struct sec section. */ | |
936 | ||
937 | struct obj_section * | |
938 | find_pc_sect_section (pc, section) | |
939 | CORE_ADDR pc; | |
940 | struct sec *section; | |
941 | { | |
942 | struct obj_section *s; | |
943 | struct objfile *objfile; | |
944 | ||
945 | ALL_OBJFILES (objfile) | |
946 | for (s = objfile->sections; s < objfile->sections_end; ++s) | |
947 | #if defined(HPUXHPPA) | |
948 | if ((section == 0 || section == s->the_bfd_section) && | |
949 | s->addr <= pc && pc <= s->endaddr) | |
950 | #else | |
951 | if ((section == 0 || section == s->the_bfd_section) && | |
952 | s->addr <= pc && pc < s->endaddr) | |
953 | #endif | |
954 | return(s); | |
955 | ||
956 | return(NULL); | |
957 | } | |
958 | ||
959 | /* Returns a section whose range includes PC or NULL if none found. | |
960 | Backward compatibility, no section. */ | |
961 | ||
962 | struct obj_section * | |
963 | find_pc_section(pc) | |
964 | CORE_ADDR pc; | |
965 | { | |
966 | return find_pc_sect_section (pc, find_pc_mapped_section (pc)); | |
967 | } | |
968 | ||
969 | ||
970 | /* In SVR4, we recognize a trampoline by it's section name. | |
971 | That is, if the pc is in a section named ".plt" then we are in | |
972 | a trampoline. */ | |
973 | ||
974 | int | |
975 | in_plt_section(pc, name) | |
976 | CORE_ADDR pc; | |
977 | char *name; | |
978 | { | |
979 | struct obj_section *s; | |
980 | int retval = 0; | |
981 | ||
982 | s = find_pc_section(pc); | |
983 | ||
984 | retval = (s != NULL | |
985 | && s->the_bfd_section->name != NULL | |
986 | && STREQ (s->the_bfd_section->name, ".plt")); | |
987 | return(retval); | |
988 | } |