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.
5 This file is part of GDB.
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.
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.
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,
20 Boston, MA 02111-1307, USA. */
22 /* This file contains support routines for creating, manipulating, and
23 destroying objfile structures. */
26 #include "bfd.h" /* Binary File Description */
30 #include "gdb-stabs.h"
33 #include <sys/types.h>
37 #include "gdb_string.h"
39 #include "breakpoint.h"
41 /* Prototypes for local functions */
43 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
46 open_existing_mapped_file PARAMS ((char *, long, int));
49 open_mapped_file PARAMS ((char *filename, long mtime, int flags));
52 map_to_file PARAMS ((int));
54 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
57 add_to_objfile_sections PARAMS ((bfd *, sec_ptr, PTR));
59 /* Externally visible variables that are owned by this module.
60 See declarations in objfile.h for more info. */
62 struct objfile *object_files; /* Linked list of all objfiles */
63 struct objfile *current_objfile; /* For symbol file being read in */
64 struct objfile *symfile_objfile; /* Main symbol table loaded from */
65 struct objfile *rt_common_objfile; /* For runtime common symbols */
67 int mapped_symbol_files; /* Try to use mapped symbol files */
69 /* Locate all mappable sections of a BFD file.
70 objfile_p_char is a char * to get it through
71 bfd_map_over_sections; we cast it back to its proper type. */
73 #ifndef TARGET_KEEP_SECTION
74 #define TARGET_KEEP_SECTION(ASECT) 0
77 /* Called via bfd_map_over_sections to build up the section table that
78 the objfile references. The objfile contains pointers to the start
79 of the table (objfile->sections) and to the first location after
80 the end of the table (objfile->sections_end). */
83 add_to_objfile_sections (abfd, asect, objfile_p_char)
88 struct objfile *objfile = (struct objfile *) objfile_p_char;
89 struct obj_section section;
92 aflag = bfd_get_section_flags (abfd, asect);
94 if (!(aflag & SEC_ALLOC) && !(TARGET_KEEP_SECTION (asect)))
97 if (0 == bfd_section_size (abfd, asect))
100 section.objfile = objfile;
101 section.the_bfd_section = asect;
102 section.ovly_mapped = 0;
103 section.addr = bfd_section_vma (abfd, asect);
104 section.endaddr = section.addr + bfd_section_size (abfd, asect);
105 obstack_grow (&objfile->psymbol_obstack, (char *) §ion, sizeof (section));
106 objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1);
109 /* Builds a section table for OBJFILE.
110 Returns 0 if OK, 1 on error (in which case bfd_error contains the
113 Note that while we are building the table, which goes into the
114 psymbol obstack, we hijack the sections_end pointer to instead hold
115 a count of the number of sections. When bfd_map_over_sections
116 returns, this count is used to compute the pointer to the end of
117 the sections table, which then overwrites the count.
119 Also note that the OFFSET and OVLY_MAPPED in each table entry
120 are initialized to zero.
122 Also note that if anything else writes to the psymbol obstack while
123 we are building the table, we're pretty much hosed. */
126 build_objfile_section_table (objfile)
127 struct objfile *objfile;
129 /* objfile->sections can be already set when reading a mapped symbol
130 file. I believe that we do need to rebuild the section table in
131 this case (we rebuild other things derived from the bfd), but we
132 can't free the old one (it's in the psymbol_obstack). So we just
133 waste some memory. */
135 objfile->sections_end = 0;
136 bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *) objfile);
137 objfile->sections = (struct obj_section *)
138 obstack_finish (&objfile->psymbol_obstack);
139 objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end;
143 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
144 allocate a new objfile struct, fill it in as best we can, link it
145 into the list of all known objfiles, and return a pointer to the
148 The FLAGS word contains various bits (OBJF_*) that can be taken as
149 requests for specific operations, like trying to open a mapped
150 version of the objfile (OBJF_MAPPED). Other bits like
151 OBJF_SHARED are simply copied through to the new objfile flags
155 allocate_objfile (abfd, flags)
159 struct objfile *objfile = NULL;
160 struct objfile *last_one = NULL;
162 if (mapped_symbol_files)
163 flags |= OBJF_MAPPED;
165 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
169 /* If we can support mapped symbol files, try to open/reopen the
170 mapped file that corresponds to the file from which we wish to
171 read symbols. If the objfile is to be mapped, we must malloc
172 the structure itself using the mmap version, and arrange that
173 all memory allocation for the objfile uses the mmap routines.
174 If we are reusing an existing mapped file, from which we get
175 our objfile pointer, we have to make sure that we update the
176 pointers to the alloc/free functions in the obstack, in case
177 these functions have moved within the current gdb. */
181 fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
187 if ((md = map_to_file (fd)) == NULL)
191 else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
193 /* Update memory corruption handler function addresses. */
197 /* Update pointers to functions to *our* copies */
198 obstack_chunkfun (&objfile->psymbol_cache.cache, xmmalloc);
199 obstack_freefun (&objfile->psymbol_cache.cache, mfree);
200 obstack_chunkfun (&objfile->psymbol_obstack, xmmalloc);
201 obstack_freefun (&objfile->psymbol_obstack, mfree);
202 obstack_chunkfun (&objfile->symbol_obstack, xmmalloc);
203 obstack_freefun (&objfile->symbol_obstack, mfree);
204 obstack_chunkfun (&objfile->type_obstack, xmmalloc);
205 obstack_freefun (&objfile->type_obstack, mfree);
206 /* If already in objfile list, unlink it. */
207 unlink_objfile (objfile);
208 /* Forget things specific to a particular gdb, may have changed. */
214 /* Set up to detect internal memory corruption. MUST be
215 done before the first malloc. See comments in
216 init_malloc() and mmcheck(). */
220 objfile = (struct objfile *)
221 xmmalloc (md, sizeof (struct objfile));
222 memset (objfile, 0, sizeof (struct objfile));
225 objfile->flags |= OBJF_MAPPED;
226 mmalloc_setkey (objfile->md, 0, objfile);
227 obstack_specify_allocation_with_arg (&objfile->psymbol_cache.cache,
228 0, 0, xmmalloc, mfree,
230 obstack_specify_allocation_with_arg (&objfile->psymbol_obstack,
231 0, 0, xmmalloc, mfree,
233 obstack_specify_allocation_with_arg (&objfile->symbol_obstack,
234 0, 0, xmmalloc, mfree,
236 obstack_specify_allocation_with_arg (&objfile->type_obstack,
237 0, 0, xmmalloc, mfree,
242 if ((flags & OBJF_MAPPED) && (objfile == NULL))
244 warning ("symbol table for '%s' will not be mapped",
245 bfd_get_filename (abfd));
246 flags &= ~OBJF_MAPPED;
249 #else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
251 if (flags & OBJF_MAPPED)
253 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
255 /* Turn off the global flag so we don't try to do mapped symbol tables
256 any more, which shuts up gdb unless the user specifically gives the
257 "mapped" keyword again. */
259 mapped_symbol_files = 0;
260 flags &= ~OBJF_MAPPED;
263 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
265 /* If we don't support mapped symbol files, didn't ask for the file to be
266 mapped, or failed to open the mapped file for some reason, then revert
267 back to an unmapped objfile. */
271 objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
272 memset (objfile, 0, sizeof (struct objfile));
274 obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0,
276 obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc,
278 obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc,
280 obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc,
282 flags &= ~OBJF_MAPPED;
285 /* Update the per-objfile information that comes from the bfd, ensuring
286 that any data that is reference is saved in the per-objfile data
289 objfile->obfd = abfd;
290 if (objfile->name != NULL)
292 mfree (objfile->md, objfile->name);
296 objfile->name = mstrsave (objfile->md, bfd_get_filename (abfd));
297 objfile->mtime = bfd_get_mtime (abfd);
299 /* Build section table. */
301 if (build_objfile_section_table (objfile))
303 error ("Can't find the file sections in `%s': %s",
304 objfile->name, bfd_errmsg (bfd_get_error ()));
308 /* Initialize the section indexes for this objfile, so that we can
309 later detect if they are used w/o being properly assigned to. */
311 objfile->sect_index_text = -1;
312 objfile->sect_index_data = -1;
313 objfile->sect_index_bss = -1;
314 objfile->sect_index_rodata = -1;
316 /* Add this file onto the tail of the linked list of other such files. */
318 objfile->next = NULL;
319 if (object_files == NULL)
320 object_files = objfile;
323 for (last_one = object_files;
325 last_one = last_one->next);
326 last_one->next = objfile;
329 /* Save passed in flag bits. */
330 objfile->flags |= flags;
335 /* Put OBJFILE at the front of the list. */
338 objfile_to_front (objfile)
339 struct objfile *objfile;
341 struct objfile **objp;
342 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
344 if (*objp == objfile)
346 /* Unhook it from where it is. */
347 *objp = objfile->next;
348 /* Put it in the front. */
349 objfile->next = object_files;
350 object_files = objfile;
356 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
359 It is not a bug, or error, to call this function if OBJFILE is not known
360 to be in the current list. This is done in the case of mapped objfiles,
361 for example, just to ensure that the mapped objfile doesn't appear twice
362 in the list. Since the list is threaded, linking in a mapped objfile
363 twice would create a circular list.
365 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
366 unlinking it, just to ensure that we have completely severed any linkages
367 between the OBJFILE and the list. */
370 unlink_objfile (objfile)
371 struct objfile *objfile;
373 struct objfile **objpp;
375 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
377 if (*objpp == objfile)
379 *objpp = (*objpp)->next;
380 objfile->next = NULL;
385 internal_error ("objfiles.c (unlink_objfile): objfile already unlinked");
389 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
390 that as much as possible is allocated on the symbol_obstack and
391 psymbol_obstack, so that the memory can be efficiently freed.
393 Things which we do NOT free because they are not in malloc'd memory
394 or not in memory specific to the objfile include:
398 FIXME: If the objfile is using reusable symbol information (via mmalloc),
399 then we need to take into account the fact that more than one process
400 may be using the symbol information at the same time (when mmalloc is
401 extended to support cooperative locking). When more than one process
402 is using the mapped symbol info, we need to be more careful about when
403 we free objects in the reusable area. */
406 free_objfile (objfile)
407 struct objfile *objfile;
409 /* First do any symbol file specific actions required when we are
410 finished with a particular symbol file. Note that if the objfile
411 is using reusable symbol information (via mmalloc) then each of
412 these routines is responsible for doing the correct thing, either
413 freeing things which are valid only during this particular gdb
414 execution, or leaving them to be reused during the next one. */
416 if (objfile->sf != NULL)
418 (*objfile->sf->sym_finish) (objfile);
421 /* We always close the bfd. */
423 if (objfile->obfd != NULL)
425 char *name = bfd_get_filename (objfile->obfd);
426 if (!bfd_close (objfile->obfd))
427 warning ("cannot close \"%s\": %s",
428 name, bfd_errmsg (bfd_get_error ()));
432 /* Remove it from the chain of all objfiles. */
434 unlink_objfile (objfile);
436 /* If we are going to free the runtime common objfile, mark it
439 if (objfile == rt_common_objfile)
440 rt_common_objfile = NULL;
442 /* Before the symbol table code was redone to make it easier to
443 selectively load and remove information particular to a specific
444 linkage unit, gdb used to do these things whenever the monolithic
445 symbol table was blown away. How much still needs to be done
446 is unknown, but we play it safe for now and keep each action until
447 it is shown to be no longer needed. */
449 /* I *think* all our callers call clear_symtab_users. If so, no need
450 to call this here. */
451 clear_pc_function_cache ();
453 /* The last thing we do is free the objfile struct itself for the
454 non-reusable case, or detach from the mapped file for the reusable
455 case. Note that the mmalloc_detach or the mfree is the last thing
456 we can do with this objfile. */
458 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
460 if (objfile->flags & OBJF_MAPPED)
462 /* Remember the fd so we can close it. We can't close it before
463 doing the detach, and after the detach the objfile is gone. */
466 mmfd = objfile->mmfd;
467 mmalloc_detach (objfile->md);
472 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
474 /* If we still have an objfile, then either we don't support reusable
475 objfiles or this one was not reusable. So free it normally. */
479 if (objfile->name != NULL)
481 mfree (objfile->md, objfile->name);
483 if (objfile->global_psymbols.list)
484 mfree (objfile->md, objfile->global_psymbols.list);
485 if (objfile->static_psymbols.list)
486 mfree (objfile->md, objfile->static_psymbols.list);
487 /* Free the obstacks for non-reusable objfiles */
488 free_bcache (&objfile->psymbol_cache);
489 obstack_free (&objfile->psymbol_obstack, 0);
490 obstack_free (&objfile->symbol_obstack, 0);
491 obstack_free (&objfile->type_obstack, 0);
492 mfree (objfile->md, objfile);
498 /* Free all the object files at once and clean up their users. */
503 struct objfile *objfile, *temp;
505 ALL_OBJFILES_SAFE (objfile, temp)
507 free_objfile (objfile);
509 clear_symtab_users ();
512 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
513 entries in new_offsets. */
515 objfile_relocate (objfile, new_offsets)
516 struct objfile *objfile;
517 struct section_offsets *new_offsets;
519 struct section_offsets *delta =
520 (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS);
524 int something_changed = 0;
525 for (i = 0; i < objfile->num_sections; ++i)
527 ANOFFSET (delta, i) =
528 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
529 if (ANOFFSET (delta, i) != 0)
530 something_changed = 1;
532 if (!something_changed)
536 /* OK, get all the symtabs. */
540 ALL_OBJFILE_SYMTABS (objfile, s)
543 struct blockvector *bv;
546 /* First the line table. */
550 for (i = 0; i < l->nitems; ++i)
551 l->item[i].pc += ANOFFSET (delta, s->block_line_section);
554 /* Don't relocate a shared blockvector more than once. */
558 bv = BLOCKVECTOR (s);
559 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
564 b = BLOCKVECTOR_BLOCK (bv, i);
565 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
566 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
568 for (j = 0; j < BLOCK_NSYMS (b); ++j)
570 struct symbol *sym = BLOCK_SYM (b, j);
571 /* The RS6000 code from which this was taken skipped
572 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
573 But I'm leaving out that test, on the theory that
574 they can't possibly pass the tests below. */
575 if ((SYMBOL_CLASS (sym) == LOC_LABEL
576 || SYMBOL_CLASS (sym) == LOC_STATIC
577 || SYMBOL_CLASS (sym) == LOC_INDIRECT)
578 && SYMBOL_SECTION (sym) >= 0)
580 SYMBOL_VALUE_ADDRESS (sym) +=
581 ANOFFSET (delta, SYMBOL_SECTION (sym));
583 #ifdef MIPS_EFI_SYMBOL_NAME
584 /* Relocate Extra Function Info for ecoff. */
586 else if (SYMBOL_CLASS (sym) == LOC_CONST
587 && SYMBOL_NAMESPACE (sym) == LABEL_NAMESPACE
588 && STRCMP (SYMBOL_NAME (sym), MIPS_EFI_SYMBOL_NAME) == 0)
589 ecoff_relocate_efi (sym, ANOFFSET (delta,
590 s->block_line_section));
598 struct partial_symtab *p;
600 ALL_OBJFILE_PSYMTABS (objfile, p)
602 p->textlow += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
603 p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
608 struct partial_symbol **psym;
610 for (psym = objfile->global_psymbols.list;
611 psym < objfile->global_psymbols.next;
613 if (SYMBOL_SECTION (*psym) >= 0)
614 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
615 SYMBOL_SECTION (*psym));
616 for (psym = objfile->static_psymbols.list;
617 psym < objfile->static_psymbols.next;
619 if (SYMBOL_SECTION (*psym) >= 0)
620 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
621 SYMBOL_SECTION (*psym));
625 struct minimal_symbol *msym;
626 ALL_OBJFILE_MSYMBOLS (objfile, msym)
627 if (SYMBOL_SECTION (msym) >= 0)
628 SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
630 /* Relocating different sections by different amounts may cause the symbols
631 to be out of order. */
632 msymbols_sort (objfile);
636 for (i = 0; i < objfile->num_sections; ++i)
637 ANOFFSET (objfile->section_offsets, i) = ANOFFSET (new_offsets, i);
641 struct obj_section *s;
644 abfd = objfile->obfd;
646 ALL_OBJFILE_OSECTIONS (objfile, s)
650 flags = bfd_get_section_flags (abfd, s->the_bfd_section);
652 if (flags & SEC_CODE)
654 s->addr += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
655 s->endaddr += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
657 else if (flags & (SEC_DATA | SEC_LOAD))
659 s->addr += ANOFFSET (delta, SECT_OFF_DATA (objfile));
660 s->endaddr += ANOFFSET (delta, SECT_OFF_DATA (objfile));
662 else if (flags & SEC_ALLOC)
664 s->addr += ANOFFSET (delta, SECT_OFF_BSS (objfile));
665 s->endaddr += ANOFFSET (delta, SECT_OFF_BSS (objfile));
670 if (objfile->ei.entry_point != ~(CORE_ADDR) 0)
671 objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
673 if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC)
675 objfile->ei.entry_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
676 objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
679 if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC)
681 objfile->ei.entry_file_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
682 objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
685 if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC)
687 objfile->ei.main_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
688 objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
691 /* Relocate breakpoints as necessary, after things are relocated. */
692 breakpoint_re_set ();
695 /* Many places in gdb want to test just to see if we have any partial
696 symbols available. This function returns zero if none are currently
697 available, nonzero otherwise. */
700 have_partial_symbols ()
706 if (ofp->psymtabs != NULL)
714 /* Many places in gdb want to test just to see if we have any full
715 symbols available. This function returns zero if none are currently
716 available, nonzero otherwise. */
725 if (ofp->symtabs != NULL)
734 /* This operations deletes all objfile entries that represent solibs that
735 weren't explicitly loaded by the user, via e.g., the add-symbol-file
739 objfile_purge_solibs ()
741 struct objfile *objf;
742 struct objfile *temp;
744 ALL_OBJFILES_SAFE (objf, temp)
746 /* We assume that the solib package has been purged already, or will
749 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
755 /* Many places in gdb want to test just to see if we have any minimal
756 symbols available. This function returns zero if none are currently
757 available, nonzero otherwise. */
760 have_minimal_symbols ()
766 if (ofp->msymbols != NULL)
774 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
776 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
777 of the corresponding symbol file in MTIME, try to open an existing file
778 with the name SYMSFILENAME and verify it is more recent than the base
779 file by checking it's timestamp against MTIME.
781 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
783 If SYMSFILENAME does exist, but is out of date, we check to see if the
784 user has specified creation of a mapped file. If so, we don't issue
785 any warning message because we will be creating a new mapped file anyway,
786 overwriting the old one. If not, then we issue a warning message so that
787 the user will know why we aren't using this existing mapped symbol file.
788 In either case, we return -1.
790 If SYMSFILENAME does exist and is not out of date, but can't be opened for
791 some reason, then prints an appropriate system error message and returns -1.
793 Otherwise, returns the open file descriptor. */
796 open_existing_mapped_file (symsfilename, mtime, flags)
804 if (stat (symsfilename, &sbuf) == 0)
806 if (sbuf.st_mtime < mtime)
808 if (!(flags & OBJF_MAPPED))
810 warning ("mapped symbol file `%s' is out of date, ignored it",
814 else if ((fd = open (symsfilename, O_RDWR)) < 0)
818 printf_unfiltered (error_pre_print);
820 print_sys_errmsg (symsfilename, errno);
826 /* Look for a mapped symbol file that corresponds to FILENAME and is more
827 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
828 use a mapped symbol file for this file, so create a new one if one does
831 If found, then return an open file descriptor for the file, otherwise
834 This routine is responsible for implementing the policy that generates
835 the name of the mapped symbol file from the name of a file containing
836 symbols that gdb would like to read. Currently this policy is to append
837 ".syms" to the name of the file.
839 This routine is also responsible for implementing the policy that
840 determines where the mapped symbol file is found (the search path).
841 This policy is that when reading an existing mapped file, a file of
842 the correct name in the current directory takes precedence over a
843 file of the correct name in the same directory as the symbol file.
844 When creating a new mapped file, it is always created in the current
845 directory. This helps to minimize the chances of a user unknowingly
846 creating big mapped files in places like /bin and /usr/local/bin, and
847 allows a local copy to override a manually installed global copy (in
848 /bin for example). */
851 open_mapped_file (filename, mtime, flags)
859 /* First try to open an existing file in the current directory, and
860 then try the directory where the symbol file is located. */
862 symsfilename = concat ("./", basename (filename), ".syms", (char *) NULL);
863 if ((fd = open_existing_mapped_file (symsfilename, mtime, flags)) < 0)
866 symsfilename = concat (filename, ".syms", (char *) NULL);
867 fd = open_existing_mapped_file (symsfilename, mtime, flags);
870 /* If we don't have an open file by now, then either the file does not
871 already exist, or the base file has changed since it was created. In
872 either case, if the user has specified use of a mapped file, then
873 create a new mapped file, truncating any existing one. If we can't
874 create one, print a system error message saying why we can't.
876 By default the file is rw for everyone, with the user's umask taking
877 care of turning off the permissions the user wants off. */
879 if ((fd < 0) && (flags & OBJF_MAPPED))
882 symsfilename = concat ("./", basename (filename), ".syms",
884 if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
888 printf_unfiltered (error_pre_print);
890 print_sys_errmsg (symsfilename, errno);
905 md = mmalloc_attach (fd, (PTR) 0);
908 mapto = (CORE_ADDR) mmalloc_getkey (md, 1);
909 md = mmalloc_detach (md);
912 /* FIXME: should figure out why detach failed */
915 else if (mapto != (CORE_ADDR) NULL)
917 /* This mapping file needs to be remapped at "mapto" */
918 md = mmalloc_attach (fd, (PTR) mapto);
922 /* This is a freshly created mapping file. */
923 mapto = (CORE_ADDR) mmalloc_findbase (20 * 1024 * 1024);
926 /* To avoid reusing the freshly created mapping file, at the
927 address selected by mmap, we must truncate it before trying
928 to do an attach at the address we want. */
930 md = mmalloc_attach (fd, (PTR) mapto);
933 mmalloc_setkey (md, 1, (PTR) mapto);
941 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
943 /* Returns a section whose range includes PC and SECTION,
944 or NULL if none found. Note the distinction between the return type,
945 struct obj_section (which is defined in gdb), and the input type
946 struct sec (which is a bfd-defined data type). The obj_section
947 contains a pointer to the bfd struct sec section. */
950 find_pc_sect_section (pc, section)
954 struct obj_section *s;
955 struct objfile *objfile;
957 ALL_OBJSECTIONS (objfile, s)
958 if ((section == 0 || section == s->the_bfd_section) &&
959 s->addr <= pc && pc < s->endaddr)
965 /* Returns a section whose range includes PC or NULL if none found.
966 Backward compatibility, no section. */
972 return find_pc_sect_section (pc, find_pc_mapped_section (pc));
976 /* In SVR4, we recognize a trampoline by it's section name.
977 That is, if the pc is in a section named ".plt" then we are in
981 in_plt_section (pc, name)
985 struct obj_section *s;
988 s = find_pc_section (pc);
991 && s->the_bfd_section->name != NULL
992 && STREQ (s->the_bfd_section->name, ".plt"));
996 /* Return nonzero if NAME is in the import list of OBJFILE. Else
1000 is_in_import_list (name, objfile)
1002 struct objfile *objfile;
1006 if (!objfile || !name || !*name)
1009 for (i = 0; i < objfile->import_list_size; i++)
1010 if (objfile->import_list[i] && STREQ (name, objfile->import_list[i]))