1 /* GDB routines for manipulating objfiles.
3 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 2001, 2002 Free Software Foundation, Inc.
6 Contributed by Cygnus Support, using pieces from other GDB modules.
8 This file is part of GDB.
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.
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.
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. */
25 /* This file contains support routines for creating, manipulating, and
26 destroying objfile structures. */
29 #include "bfd.h" /* Binary File Description */
33 #include "gdb-stabs.h"
37 #include <sys/types.h>
40 #include "gdb_obstack.h"
41 #include "gdb_string.h"
43 #include "breakpoint.h"
45 /* Prototypes for local functions */
47 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
51 static int open_existing_mapped_file (char *, long, int);
53 static int open_mapped_file (char *filename, long mtime, int flags);
55 static void *map_to_file (int);
57 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
59 static void add_to_objfile_sections (bfd *, sec_ptr, void *);
61 /* Externally visible variables that are owned by this module.
62 See declarations in objfile.h for more info. */
64 struct objfile *object_files; /* Linked list of all objfiles */
65 struct objfile *current_objfile; /* For symbol file being read in */
66 struct objfile *symfile_objfile; /* Main symbol table loaded from */
67 struct objfile *rt_common_objfile; /* For runtime common symbols */
69 int mapped_symbol_files; /* Try to use mapped symbol files */
71 /* Locate all mappable sections of a BFD file.
72 objfile_p_char is a char * to get it through
73 bfd_map_over_sections; we cast it back to its proper type. */
75 #ifndef TARGET_KEEP_SECTION
76 #define TARGET_KEEP_SECTION(ASECT) 0
79 /* Called via bfd_map_over_sections to build up the section table that
80 the objfile references. The objfile contains pointers to the start
81 of the table (objfile->sections) and to the first location after
82 the end of the table (objfile->sections_end). */
85 add_to_objfile_sections (bfd *abfd, sec_ptr asect, void *objfile_p_char)
87 struct objfile *objfile = (struct objfile *) objfile_p_char;
88 struct obj_section section;
91 aflag = bfd_get_section_flags (abfd, asect);
93 if (!(aflag & SEC_ALLOC) && !(TARGET_KEEP_SECTION (asect)))
96 if (0 == bfd_section_size (abfd, asect))
99 section.objfile = objfile;
100 section.the_bfd_section = asect;
101 section.ovly_mapped = 0;
102 section.addr = bfd_section_vma (abfd, asect);
103 section.endaddr = section.addr + bfd_section_size (abfd, asect);
104 obstack_grow (&objfile->psymbol_obstack, (char *) §ion, sizeof (section));
105 objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1);
108 /* Builds a section table for OBJFILE.
109 Returns 0 if OK, 1 on error (in which case bfd_error contains the
112 Note that while we are building the table, which goes into the
113 psymbol obstack, we hijack the sections_end pointer to instead hold
114 a count of the number of sections. When bfd_map_over_sections
115 returns, this count is used to compute the pointer to the end of
116 the sections table, which then overwrites the count.
118 Also note that the OFFSET and OVLY_MAPPED in each table entry
119 are initialized to zero.
121 Also note that if anything else writes to the psymbol obstack while
122 we are building the table, we're pretty much hosed. */
125 build_objfile_section_table (struct objfile *objfile)
127 /* objfile->sections can be already set when reading a mapped symbol
128 file. I believe that we do need to rebuild the section table in
129 this case (we rebuild other things derived from the bfd), but we
130 can't free the old one (it's in the psymbol_obstack). So we just
131 waste some memory. */
133 objfile->sections_end = 0;
134 bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *) objfile);
135 objfile->sections = (struct obj_section *)
136 obstack_finish (&objfile->psymbol_obstack);
137 objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end;
141 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
142 allocate a new objfile struct, fill it in as best we can, link it
143 into the list of all known objfiles, and return a pointer to the
146 The FLAGS word contains various bits (OBJF_*) that can be taken as
147 requests for specific operations, like trying to open a mapped
148 version of the objfile (OBJF_MAPPED). Other bits like
149 OBJF_SHARED are simply copied through to the new objfile flags
153 allocate_objfile (bfd *abfd, int flags)
155 struct objfile *objfile = NULL;
156 struct objfile *last_one = NULL;
158 if (mapped_symbol_files)
159 flags |= OBJF_MAPPED;
161 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
165 /* If we can support mapped symbol files, try to open/reopen the
166 mapped file that corresponds to the file from which we wish to
167 read symbols. If the objfile is to be mapped, we must malloc
168 the structure itself using the mmap version, and arrange that
169 all memory allocation for the objfile uses the mmap routines.
170 If we are reusing an existing mapped file, from which we get
171 our objfile pointer, we have to make sure that we update the
172 pointers to the alloc/free functions in the obstack, in case
173 these functions have moved within the current gdb. */
177 fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
183 if ((md = map_to_file (fd)) == NULL)
187 else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
189 /* Update memory corruption handler function addresses. */
193 /* Update pointers to functions to *our* copies */
194 obstack_chunkfun (&objfile->psymbol_cache.cache, xmmalloc);
195 obstack_freefun (&objfile->psymbol_cache.cache, xmfree);
196 obstack_chunkfun (&objfile->macro_cache.cache, xmmalloc);
197 obstack_freefun (&objfile->macro_cache.cache, xmfree);
198 obstack_chunkfun (&objfile->psymbol_obstack, xmmalloc);
199 obstack_freefun (&objfile->psymbol_obstack, xmfree);
200 obstack_chunkfun (&objfile->symbol_obstack, xmmalloc);
201 obstack_freefun (&objfile->symbol_obstack, xmfree);
202 obstack_chunkfun (&objfile->type_obstack, xmmalloc);
203 obstack_freefun (&objfile->type_obstack, xmfree);
204 /* If already in objfile list, unlink it. */
205 unlink_objfile (objfile);
206 /* Forget things specific to a particular gdb, may have changed. */
212 /* Set up to detect internal memory corruption. MUST be
213 done before the first malloc. See comments in
214 init_malloc() and mmcheck(). */
218 objfile = (struct objfile *)
219 xmmalloc (md, sizeof (struct objfile));
220 memset (objfile, 0, sizeof (struct objfile));
223 objfile->flags |= OBJF_MAPPED;
224 mmalloc_setkey (objfile->md, 0, objfile);
225 obstack_specify_allocation_with_arg (&objfile->psymbol_cache.cache,
226 0, 0, xmmalloc, xmfree,
228 obstack_specify_allocation_with_arg (&objfile->macro_cache.cache,
229 0, 0, xmmalloc, xmfree,
231 obstack_specify_allocation_with_arg (&objfile->psymbol_obstack,
232 0, 0, xmmalloc, xmfree,
234 obstack_specify_allocation_with_arg (&objfile->symbol_obstack,
235 0, 0, xmmalloc, xmfree,
237 obstack_specify_allocation_with_arg (&objfile->type_obstack,
238 0, 0, xmmalloc, xmfree,
243 if ((flags & OBJF_MAPPED) && (objfile == NULL))
245 warning ("symbol table for '%s' will not be mapped",
246 bfd_get_filename (abfd));
247 flags &= ~OBJF_MAPPED;
250 #else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
252 if (flags & OBJF_MAPPED)
254 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
256 /* Turn off the global flag so we don't try to do mapped symbol tables
257 any more, which shuts up gdb unless the user specifically gives the
258 "mapped" keyword again. */
260 mapped_symbol_files = 0;
261 flags &= ~OBJF_MAPPED;
264 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
266 /* If we don't support mapped symbol files, didn't ask for the file to be
267 mapped, or failed to open the mapped file for some reason, then revert
268 back to an unmapped objfile. */
272 objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
273 memset (objfile, 0, sizeof (struct objfile));
275 objfile->psymbol_cache = bcache_xmalloc ();
276 objfile->macro_cache = bcache_xmalloc ();
277 obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc,
279 obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc,
281 obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc,
283 flags &= ~OBJF_MAPPED;
285 terminate_minimal_symbol_table (objfile);
288 /* Update the per-objfile information that comes from the bfd, ensuring
289 that any data that is reference is saved in the per-objfile data
292 objfile->obfd = abfd;
293 if (objfile->name != NULL)
295 xmfree (objfile->md, objfile->name);
299 objfile->name = mstrsave (objfile->md, bfd_get_filename (abfd));
300 objfile->mtime = bfd_get_mtime (abfd);
302 /* Build section table. */
304 if (build_objfile_section_table (objfile))
306 error ("Can't find the file sections in `%s': %s",
307 objfile->name, bfd_errmsg (bfd_get_error ()));
311 /* Initialize the section indexes for this objfile, so that we can
312 later detect if they are used w/o being properly assigned to. */
314 objfile->sect_index_text = -1;
315 objfile->sect_index_data = -1;
316 objfile->sect_index_bss = -1;
317 objfile->sect_index_rodata = -1;
319 /* Add this file onto the tail of the linked list of other such files. */
321 objfile->next = NULL;
322 if (object_files == NULL)
323 object_files = objfile;
326 for (last_one = object_files;
328 last_one = last_one->next);
329 last_one->next = objfile;
332 /* Save passed in flag bits. */
333 objfile->flags |= flags;
339 /* Create the terminating entry of OBJFILE's minimal symbol table.
340 If OBJFILE->msymbols is zero, allocate a single entry from
341 OBJFILE->symbol_obstack; otherwise, just initialize
342 OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */
344 terminate_minimal_symbol_table (struct objfile *objfile)
346 if (! objfile->msymbols)
347 objfile->msymbols = ((struct minimal_symbol *)
348 obstack_alloc (&objfile->symbol_obstack,
349 sizeof (objfile->msymbols[0])));
352 struct minimal_symbol *m
353 = &objfile->msymbols[objfile->minimal_symbol_count];
355 memset (m, 0, sizeof (*m));
356 SYMBOL_NAME (m) = NULL;
357 SYMBOL_VALUE_ADDRESS (m) = 0;
358 MSYMBOL_INFO (m) = NULL;
359 MSYMBOL_TYPE (m) = mst_unknown;
360 SYMBOL_INIT_LANGUAGE_SPECIFIC (m, language_unknown);
365 /* Put one object file before a specified on in the global list.
366 This can be used to make sure an object file is destroyed before
367 another when using ALL_OBJFILES_SAFE to free all objfiles. */
369 put_objfile_before (struct objfile *objfile, struct objfile *before_this)
371 struct objfile **objp;
373 unlink_objfile (objfile);
375 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
377 if (*objp == before_this)
379 objfile->next = *objp;
385 internal_error (__FILE__, __LINE__,
386 "put_objfile_before: before objfile not in list");
389 /* Put OBJFILE at the front of the list. */
392 objfile_to_front (struct objfile *objfile)
394 struct objfile **objp;
395 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
397 if (*objp == objfile)
399 /* Unhook it from where it is. */
400 *objp = objfile->next;
401 /* Put it in the front. */
402 objfile->next = object_files;
403 object_files = objfile;
409 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
412 It is not a bug, or error, to call this function if OBJFILE is not known
413 to be in the current list. This is done in the case of mapped objfiles,
414 for example, just to ensure that the mapped objfile doesn't appear twice
415 in the list. Since the list is threaded, linking in a mapped objfile
416 twice would create a circular list.
418 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
419 unlinking it, just to ensure that we have completely severed any linkages
420 between the OBJFILE and the list. */
423 unlink_objfile (struct objfile *objfile)
425 struct objfile **objpp;
427 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
429 if (*objpp == objfile)
431 *objpp = (*objpp)->next;
432 objfile->next = NULL;
437 internal_error (__FILE__, __LINE__,
438 "unlink_objfile: objfile already unlinked");
442 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
443 that as much as possible is allocated on the symbol_obstack and
444 psymbol_obstack, so that the memory can be efficiently freed.
446 Things which we do NOT free because they are not in malloc'd memory
447 or not in memory specific to the objfile include:
451 FIXME: If the objfile is using reusable symbol information (via mmalloc),
452 then we need to take into account the fact that more than one process
453 may be using the symbol information at the same time (when mmalloc is
454 extended to support cooperative locking). When more than one process
455 is using the mapped symbol info, we need to be more careful about when
456 we free objects in the reusable area. */
459 free_objfile (struct objfile *objfile)
461 if (objfile->separate_debug_objfile)
463 free_objfile (objfile->separate_debug_objfile);
466 if (objfile->separate_debug_objfile_backlink)
468 /* We freed the separate debug file, make sure the base objfile
469 doesn't reference it. */
470 objfile->separate_debug_objfile_backlink->separate_debug_objfile = NULL;
473 /* First do any symbol file specific actions required when we are
474 finished with a particular symbol file. Note that if the objfile
475 is using reusable symbol information (via mmalloc) then each of
476 these routines is responsible for doing the correct thing, either
477 freeing things which are valid only during this particular gdb
478 execution, or leaving them to be reused during the next one. */
480 if (objfile->sf != NULL)
482 (*objfile->sf->sym_finish) (objfile);
485 /* We always close the bfd. */
487 if (objfile->obfd != NULL)
489 char *name = bfd_get_filename (objfile->obfd);
490 if (!bfd_close (objfile->obfd))
491 warning ("cannot close \"%s\": %s",
492 name, bfd_errmsg (bfd_get_error ()));
496 /* Remove it from the chain of all objfiles. */
498 unlink_objfile (objfile);
500 /* If we are going to free the runtime common objfile, mark it
503 if (objfile == rt_common_objfile)
504 rt_common_objfile = NULL;
506 /* Before the symbol table code was redone to make it easier to
507 selectively load and remove information particular to a specific
508 linkage unit, gdb used to do these things whenever the monolithic
509 symbol table was blown away. How much still needs to be done
510 is unknown, but we play it safe for now and keep each action until
511 it is shown to be no longer needed. */
513 /* I *think* all our callers call clear_symtab_users. If so, no need
514 to call this here. */
515 clear_pc_function_cache ();
517 /* The last thing we do is free the objfile struct itself for the
518 non-reusable case, or detach from the mapped file for the
519 reusable case. Note that the mmalloc_detach or the xmfree() is
520 the last thing we can do with this objfile. */
522 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
524 if (objfile->flags & OBJF_MAPPED)
526 /* Remember the fd so we can close it. We can't close it before
527 doing the detach, and after the detach the objfile is gone. */
530 mmfd = objfile->mmfd;
531 mmalloc_detach (objfile->md);
536 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
538 /* If we still have an objfile, then either we don't support reusable
539 objfiles or this one was not reusable. So free it normally. */
543 if (objfile->name != NULL)
545 xmfree (objfile->md, objfile->name);
547 if (objfile->global_psymbols.list)
548 xmfree (objfile->md, objfile->global_psymbols.list);
549 if (objfile->static_psymbols.list)
550 xmfree (objfile->md, objfile->static_psymbols.list);
551 /* Free the obstacks for non-reusable objfiles */
552 bcache_xfree (objfile->psymbol_cache);
553 bcache_xfree (objfile->macro_cache);
554 obstack_free (&objfile->psymbol_obstack, 0);
555 obstack_free (&objfile->symbol_obstack, 0);
556 obstack_free (&objfile->type_obstack, 0);
557 xmfree (objfile->md, objfile);
563 do_free_objfile_cleanup (void *obj)
569 make_cleanup_free_objfile (struct objfile *obj)
571 return make_cleanup (do_free_objfile_cleanup, obj);
574 /* Free all the object files at once and clean up their users. */
577 free_all_objfiles (void)
579 struct objfile *objfile, *temp;
581 ALL_OBJFILES_SAFE (objfile, temp)
583 free_objfile (objfile);
585 clear_symtab_users ();
588 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
589 entries in new_offsets. */
591 objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets)
593 struct section_offsets *delta =
594 (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS);
598 int something_changed = 0;
599 for (i = 0; i < objfile->num_sections; ++i)
602 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
603 if (ANOFFSET (delta, i) != 0)
604 something_changed = 1;
606 if (!something_changed)
610 /* OK, get all the symtabs. */
614 ALL_OBJFILE_SYMTABS (objfile, s)
617 struct blockvector *bv;
620 /* First the line table. */
624 for (i = 0; i < l->nitems; ++i)
625 l->item[i].pc += ANOFFSET (delta, s->block_line_section);
628 /* Don't relocate a shared blockvector more than once. */
632 bv = BLOCKVECTOR (s);
633 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
639 b = BLOCKVECTOR_BLOCK (bv, i);
640 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
641 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
643 ALL_BLOCK_SYMBOLS (b, j, sym)
645 fixup_symbol_section (sym, objfile);
647 /* The RS6000 code from which this was taken skipped
648 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
649 But I'm leaving out that test, on the theory that
650 they can't possibly pass the tests below. */
651 if ((SYMBOL_CLASS (sym) == LOC_LABEL
652 || SYMBOL_CLASS (sym) == LOC_STATIC
653 || SYMBOL_CLASS (sym) == LOC_INDIRECT)
654 && SYMBOL_SECTION (sym) >= 0)
656 SYMBOL_VALUE_ADDRESS (sym) +=
657 ANOFFSET (delta, SYMBOL_SECTION (sym));
659 #ifdef MIPS_EFI_SYMBOL_NAME
660 /* Relocate Extra Function Info for ecoff. */
662 else if (SYMBOL_CLASS (sym) == LOC_CONST
663 && SYMBOL_NAMESPACE (sym) == LABEL_NAMESPACE
664 && strcmp (SYMBOL_NAME (sym), MIPS_EFI_SYMBOL_NAME) == 0)
665 ecoff_relocate_efi (sym, ANOFFSET (delta,
666 s->block_line_section));
674 struct partial_symtab *p;
676 ALL_OBJFILE_PSYMTABS (objfile, p)
678 p->textlow += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
679 p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
684 struct partial_symbol **psym;
686 for (psym = objfile->global_psymbols.list;
687 psym < objfile->global_psymbols.next;
690 fixup_psymbol_section (*psym, objfile);
691 if (SYMBOL_SECTION (*psym) >= 0)
692 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
693 SYMBOL_SECTION (*psym));
695 for (psym = objfile->static_psymbols.list;
696 psym < objfile->static_psymbols.next;
699 fixup_psymbol_section (*psym, objfile);
700 if (SYMBOL_SECTION (*psym) >= 0)
701 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
702 SYMBOL_SECTION (*psym));
707 struct minimal_symbol *msym;
708 ALL_OBJFILE_MSYMBOLS (objfile, msym)
709 if (SYMBOL_SECTION (msym) >= 0)
710 SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
712 /* Relocating different sections by different amounts may cause the symbols
713 to be out of order. */
714 msymbols_sort (objfile);
718 for (i = 0; i < objfile->num_sections; ++i)
719 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
722 if (objfile->ei.entry_point != ~(CORE_ADDR) 0)
724 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
725 only as a fallback. */
726 struct obj_section *s;
727 s = find_pc_section (objfile->ei.entry_point);
729 objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index);
731 objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
735 struct obj_section *s;
738 abfd = objfile->obfd;
740 ALL_OBJFILE_OSECTIONS (objfile, s)
742 int idx = s->the_bfd_section->index;
744 s->addr += ANOFFSET (delta, idx);
745 s->endaddr += ANOFFSET (delta, idx);
749 if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC)
751 objfile->ei.entry_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
752 objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
755 if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC)
757 objfile->ei.entry_file_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
758 objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
761 if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC)
763 objfile->ei.main_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
764 objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
767 /* Relocate breakpoints as necessary, after things are relocated. */
768 breakpoint_re_set ();
771 /* Many places in gdb want to test just to see if we have any partial
772 symbols available. This function returns zero if none are currently
773 available, nonzero otherwise. */
776 have_partial_symbols (void)
782 if (ofp->psymtabs != NULL)
790 /* Many places in gdb want to test just to see if we have any full
791 symbols available. This function returns zero if none are currently
792 available, nonzero otherwise. */
795 have_full_symbols (void)
801 if (ofp->symtabs != NULL)
810 /* This operations deletes all objfile entries that represent solibs that
811 weren't explicitly loaded by the user, via e.g., the add-symbol-file
815 objfile_purge_solibs (void)
817 struct objfile *objf;
818 struct objfile *temp;
820 ALL_OBJFILES_SAFE (objf, temp)
822 /* We assume that the solib package has been purged already, or will
825 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
831 /* Many places in gdb want to test just to see if we have any minimal
832 symbols available. This function returns zero if none are currently
833 available, nonzero otherwise. */
836 have_minimal_symbols (void)
842 if (ofp->minimal_symbol_count > 0)
850 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
852 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
853 of the corresponding symbol file in MTIME, try to open an existing file
854 with the name SYMSFILENAME and verify it is more recent than the base
855 file by checking it's timestamp against MTIME.
857 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
859 If SYMSFILENAME does exist, but is out of date, we check to see if the
860 user has specified creation of a mapped file. If so, we don't issue
861 any warning message because we will be creating a new mapped file anyway,
862 overwriting the old one. If not, then we issue a warning message so that
863 the user will know why we aren't using this existing mapped symbol file.
864 In either case, we return -1.
866 If SYMSFILENAME does exist and is not out of date, but can't be opened for
867 some reason, then prints an appropriate system error message and returns -1.
869 Otherwise, returns the open file descriptor. */
872 open_existing_mapped_file (char *symsfilename, long mtime, int flags)
877 if (stat (symsfilename, &sbuf) == 0)
879 if (sbuf.st_mtime < mtime)
881 if (!(flags & OBJF_MAPPED))
883 warning ("mapped symbol file `%s' is out of date, ignored it",
887 else if ((fd = open (symsfilename, O_RDWR)) < 0)
891 printf_unfiltered (error_pre_print);
893 print_sys_errmsg (symsfilename, errno);
899 /* Look for a mapped symbol file that corresponds to FILENAME and is more
900 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
901 use a mapped symbol file for this file, so create a new one if one does
904 If found, then return an open file descriptor for the file, otherwise
907 This routine is responsible for implementing the policy that generates
908 the name of the mapped symbol file from the name of a file containing
909 symbols that gdb would like to read. Currently this policy is to append
910 ".syms" to the name of the file.
912 This routine is also responsible for implementing the policy that
913 determines where the mapped symbol file is found (the search path).
914 This policy is that when reading an existing mapped file, a file of
915 the correct name in the current directory takes precedence over a
916 file of the correct name in the same directory as the symbol file.
917 When creating a new mapped file, it is always created in the current
918 directory. This helps to minimize the chances of a user unknowingly
919 creating big mapped files in places like /bin and /usr/local/bin, and
920 allows a local copy to override a manually installed global copy (in
921 /bin for example). */
924 open_mapped_file (char *filename, long mtime, int flags)
929 /* First try to open an existing file in the current directory, and
930 then try the directory where the symbol file is located. */
932 symsfilename = concat ("./", lbasename (filename), ".syms", (char *) NULL);
933 if ((fd = open_existing_mapped_file (symsfilename, mtime, flags)) < 0)
935 xfree (symsfilename);
936 symsfilename = concat (filename, ".syms", (char *) NULL);
937 fd = open_existing_mapped_file (symsfilename, mtime, flags);
940 /* If we don't have an open file by now, then either the file does not
941 already exist, or the base file has changed since it was created. In
942 either case, if the user has specified use of a mapped file, then
943 create a new mapped file, truncating any existing one. If we can't
944 create one, print a system error message saying why we can't.
946 By default the file is rw for everyone, with the user's umask taking
947 care of turning off the permissions the user wants off. */
949 if ((fd < 0) && (flags & OBJF_MAPPED))
951 xfree (symsfilename);
952 symsfilename = concat ("./", lbasename (filename), ".syms",
954 if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
958 printf_unfiltered (error_pre_print);
960 print_sys_errmsg (symsfilename, errno);
964 xfree (symsfilename);
974 md = mmalloc_attach (fd, 0);
977 mapto = (CORE_ADDR) mmalloc_getkey (md, 1);
978 md = mmalloc_detach (md);
981 /* FIXME: should figure out why detach failed */
984 else if (mapto != (CORE_ADDR) NULL)
986 /* This mapping file needs to be remapped at "mapto" */
987 md = mmalloc_attach (fd, mapto);
991 /* This is a freshly created mapping file. */
992 mapto = (CORE_ADDR) mmalloc_findbase (20 * 1024 * 1024);
995 /* To avoid reusing the freshly created mapping file, at the
996 address selected by mmap, we must truncate it before trying
997 to do an attach at the address we want. */
999 md = mmalloc_attach (fd, mapto);
1002 mmalloc_setkey (md, 1, mapto);
1010 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
1012 /* Returns a section whose range includes PC and SECTION,
1013 or NULL if none found. Note the distinction between the return type,
1014 struct obj_section (which is defined in gdb), and the input type
1015 struct sec (which is a bfd-defined data type). The obj_section
1016 contains a pointer to the bfd struct sec section. */
1018 struct obj_section *
1019 find_pc_sect_section (CORE_ADDR pc, struct sec *section)
1021 struct obj_section *s;
1022 struct objfile *objfile;
1024 ALL_OBJSECTIONS (objfile, s)
1025 if ((section == 0 || section == s->the_bfd_section) &&
1026 s->addr <= pc && pc < s->endaddr)
1032 /* Returns a section whose range includes PC or NULL if none found.
1033 Backward compatibility, no section. */
1035 struct obj_section *
1036 find_pc_section (CORE_ADDR pc)
1038 return find_pc_sect_section (pc, find_pc_mapped_section (pc));
1042 /* In SVR4, we recognize a trampoline by it's section name.
1043 That is, if the pc is in a section named ".plt" then we are in
1047 in_plt_section (CORE_ADDR pc, char *name)
1049 struct obj_section *s;
1052 s = find_pc_section (pc);
1055 && s->the_bfd_section->name != NULL
1056 && STREQ (s->the_bfd_section->name, ".plt"));
1060 /* Return nonzero if NAME is in the import list of OBJFILE. Else
1064 is_in_import_list (char *name, struct objfile *objfile)
1068 if (!objfile || !name || !*name)
1071 for (i = 0; i < objfile->import_list_size; i++)
1072 if (objfile->import_list[i] && STREQ (name, objfile->import_list[i]))