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 mapped));
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
78 add_to_objfile_sections (abfd, asect, objfile_p_char)
83 struct objfile *objfile = (struct objfile *) objfile_p_char;
84 struct obj_section section;
87 aflag = bfd_get_section_flags (abfd, asect);
89 if (!(aflag & SEC_ALLOC) && !(TARGET_KEEP_SECTION (asect)))
92 if (0 == bfd_section_size (abfd, asect))
95 section.objfile = objfile;
96 section.the_bfd_section = asect;
97 section.ovly_mapped = 0;
98 section.addr = bfd_section_vma (abfd, asect);
99 section.endaddr = section.addr + bfd_section_size (abfd, asect);
100 obstack_grow (&objfile->psymbol_obstack, (char *) §ion, sizeof (section));
101 objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1);
104 /* Builds a section table for OBJFILE.
105 Returns 0 if OK, 1 on error (in which case bfd_error contains the
109 build_objfile_section_table (objfile)
110 struct objfile *objfile;
112 /* objfile->sections can be already set when reading a mapped symbol
113 file. I believe that we do need to rebuild the section table in
114 this case (we rebuild other things derived from the bfd), but we
115 can't free the old one (it's in the psymbol_obstack). So we just
116 waste some memory. */
118 objfile->sections_end = 0;
119 bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *) objfile);
120 objfile->sections = (struct obj_section *)
121 obstack_finish (&objfile->psymbol_obstack);
122 objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end;
126 /* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
127 whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
128 struct, fill it in as best we can, link it into the list of all known
129 objfiles, and return a pointer to the new objfile struct.
131 USER_LOADED is simply recorded in the objfile. This record offers a way for
132 run_command to remove old objfile entries which are no longer valid (i.e.,
133 are associated with an old inferior), but to preserve ones that the user
134 explicitly loaded via the add-symbol-file command.
136 IS_SOLIB is also simply recorded in the objfile. */
139 allocate_objfile (abfd, mapped, user_loaded, is_solib)
145 struct objfile *objfile = NULL;
146 struct objfile *last_one = NULL;
148 mapped |= mapped_symbol_files;
150 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
154 /* If we can support mapped symbol files, try to open/reopen the
155 mapped file that corresponds to the file from which we wish to
156 read symbols. If the objfile is to be mapped, we must malloc
157 the structure itself using the mmap version, and arrange that
158 all memory allocation for the objfile uses the mmap routines.
159 If we are reusing an existing mapped file, from which we get
160 our objfile pointer, we have to make sure that we update the
161 pointers to the alloc/free functions in the obstack, in case
162 these functions have moved within the current gdb. */
166 fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
172 if ((md = map_to_file (fd)) == NULL)
176 else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
178 /* Update memory corruption handler function addresses. */
182 /* Update pointers to functions to *our* copies */
183 obstack_chunkfun (&objfile->psymbol_cache.cache, xmmalloc);
184 obstack_freefun (&objfile->psymbol_cache.cache, mfree);
185 obstack_chunkfun (&objfile->psymbol_obstack, xmmalloc);
186 obstack_freefun (&objfile->psymbol_obstack, mfree);
187 obstack_chunkfun (&objfile->symbol_obstack, xmmalloc);
188 obstack_freefun (&objfile->symbol_obstack, mfree);
189 obstack_chunkfun (&objfile->type_obstack, xmmalloc);
190 obstack_freefun (&objfile->type_obstack, mfree);
191 /* If already in objfile list, unlink it. */
192 unlink_objfile (objfile);
193 /* Forget things specific to a particular gdb, may have changed. */
199 /* Set up to detect internal memory corruption. MUST be
200 done before the first malloc. See comments in
201 init_malloc() and mmcheck(). */
205 objfile = (struct objfile *)
206 xmmalloc (md, sizeof (struct objfile));
207 memset (objfile, 0, sizeof (struct objfile));
210 objfile->flags |= OBJF_MAPPED;
211 mmalloc_setkey (objfile->md, 0, objfile);
212 obstack_specify_allocation_with_arg (&objfile->psymbol_cache.cache,
213 0, 0, xmmalloc, mfree,
215 obstack_specify_allocation_with_arg (&objfile->psymbol_obstack,
216 0, 0, xmmalloc, mfree,
218 obstack_specify_allocation_with_arg (&objfile->symbol_obstack,
219 0, 0, xmmalloc, mfree,
221 obstack_specify_allocation_with_arg (&objfile->type_obstack,
222 0, 0, xmmalloc, mfree,
227 if (mapped && (objfile == NULL))
229 warning ("symbol table for '%s' will not be mapped",
230 bfd_get_filename (abfd));
233 #else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
237 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
239 /* Turn off the global flag so we don't try to do mapped symbol tables
240 any more, which shuts up gdb unless the user specifically gives the
241 "mapped" keyword again. */
243 mapped_symbol_files = 0;
246 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
248 /* If we don't support mapped symbol files, didn't ask for the file to be
249 mapped, or failed to open the mapped file for some reason, then revert
250 back to an unmapped objfile. */
254 objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
255 memset (objfile, 0, sizeof (struct objfile));
257 obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0,
259 obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc,
261 obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc,
263 obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc,
267 /* Update the per-objfile information that comes from the bfd, ensuring
268 that any data that is reference is saved in the per-objfile data
271 objfile->obfd = abfd;
272 if (objfile->name != NULL)
274 mfree (objfile->md, objfile->name);
278 objfile->name = mstrsave (objfile->md, bfd_get_filename (abfd));
279 objfile->mtime = bfd_get_mtime (abfd);
281 /* Build section table. */
283 if (build_objfile_section_table (objfile))
285 error ("Can't find the file sections in `%s': %s",
286 objfile->name, bfd_errmsg (bfd_get_error ()));
290 /* Add this file onto the tail of the linked list of other such files. */
292 objfile->next = NULL;
293 if (object_files == NULL)
294 object_files = objfile;
297 for (last_one = object_files;
299 last_one = last_one->next);
300 last_one->next = objfile;
303 /* Record whether this objfile was created because the user explicitly
304 caused it (e.g., used the add-symbol-file command).
306 objfile->user_loaded = user_loaded;
308 /* Record whether this objfile definitely represents a solib. */
309 objfile->is_solib = is_solib;
314 /* Put OBJFILE at the front of the list. */
317 objfile_to_front (objfile)
318 struct objfile *objfile;
320 struct objfile **objp;
321 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
323 if (*objp == objfile)
325 /* Unhook it from where it is. */
326 *objp = objfile->next;
327 /* Put it in the front. */
328 objfile->next = object_files;
329 object_files = objfile;
335 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
338 It is not a bug, or error, to call this function if OBJFILE is not known
339 to be in the current list. This is done in the case of mapped objfiles,
340 for example, just to ensure that the mapped objfile doesn't appear twice
341 in the list. Since the list is threaded, linking in a mapped objfile
342 twice would create a circular list.
344 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
345 unlinking it, just to ensure that we have completely severed any linkages
346 between the OBJFILE and the list. */
349 unlink_objfile (objfile)
350 struct objfile *objfile;
352 struct objfile **objpp;
354 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
356 if (*objpp == objfile)
358 *objpp = (*objpp)->next;
359 objfile->next = NULL;
366 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
367 that as much as possible is allocated on the symbol_obstack and
368 psymbol_obstack, so that the memory can be efficiently freed.
370 Things which we do NOT free because they are not in malloc'd memory
371 or not in memory specific to the objfile include:
375 FIXME: If the objfile is using reusable symbol information (via mmalloc),
376 then we need to take into account the fact that more than one process
377 may be using the symbol information at the same time (when mmalloc is
378 extended to support cooperative locking). When more than one process
379 is using the mapped symbol info, we need to be more careful about when
380 we free objects in the reusable area. */
383 free_objfile (objfile)
384 struct objfile *objfile;
386 /* First do any symbol file specific actions required when we are
387 finished with a particular symbol file. Note that if the objfile
388 is using reusable symbol information (via mmalloc) then each of
389 these routines is responsible for doing the correct thing, either
390 freeing things which are valid only during this particular gdb
391 execution, or leaving them to be reused during the next one. */
393 if (objfile->sf != NULL)
395 (*objfile->sf->sym_finish) (objfile);
398 /* We always close the bfd. */
400 if (objfile->obfd != NULL)
402 char *name = bfd_get_filename (objfile->obfd);
403 if (!bfd_close (objfile->obfd))
404 warning ("cannot close \"%s\": %s",
405 name, bfd_errmsg (bfd_get_error ()));
409 /* Remove it from the chain of all objfiles. */
411 unlink_objfile (objfile);
413 /* If we are going to free the runtime common objfile, mark it
416 if (objfile == rt_common_objfile)
417 rt_common_objfile = NULL;
419 /* Before the symbol table code was redone to make it easier to
420 selectively load and remove information particular to a specific
421 linkage unit, gdb used to do these things whenever the monolithic
422 symbol table was blown away. How much still needs to be done
423 is unknown, but we play it safe for now and keep each action until
424 it is shown to be no longer needed. */
426 #if defined (CLEAR_SOLIB)
428 /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
429 the to_sections for a core file might refer to those bfd's. So
430 detach any core file. */
432 struct target_ops *t = find_core_target ();
434 (t->to_detach) (NULL, 0);
437 /* I *think* all our callers call clear_symtab_users. If so, no need
438 to call this here. */
439 clear_pc_function_cache ();
441 /* The last thing we do is free the objfile struct itself for the
442 non-reusable case, or detach from the mapped file for the reusable
443 case. Note that the mmalloc_detach or the mfree is the last thing
444 we can do with this objfile. */
446 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
448 if (objfile->flags & OBJF_MAPPED)
450 /* Remember the fd so we can close it. We can't close it before
451 doing the detach, and after the detach the objfile is gone. */
454 mmfd = objfile->mmfd;
455 mmalloc_detach (objfile->md);
460 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
462 /* If we still have an objfile, then either we don't support reusable
463 objfiles or this one was not reusable. So free it normally. */
467 if (objfile->name != NULL)
469 mfree (objfile->md, objfile->name);
471 if (objfile->global_psymbols.list)
472 mfree (objfile->md, objfile->global_psymbols.list);
473 if (objfile->static_psymbols.list)
474 mfree (objfile->md, objfile->static_psymbols.list);
475 /* Free the obstacks for non-reusable objfiles */
476 obstack_free (&objfile->psymbol_cache.cache, 0);
477 obstack_free (&objfile->psymbol_obstack, 0);
478 obstack_free (&objfile->symbol_obstack, 0);
479 obstack_free (&objfile->type_obstack, 0);
480 mfree (objfile->md, objfile);
486 /* Free all the object files at once and clean up their users. */
491 struct objfile *objfile, *temp;
493 ALL_OBJFILES_SAFE (objfile, temp)
495 free_objfile (objfile);
497 clear_symtab_users ();
500 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
501 entries in new_offsets. */
503 objfile_relocate (objfile, new_offsets)
504 struct objfile *objfile;
505 struct section_offsets *new_offsets;
507 struct section_offsets *delta = (struct section_offsets *)
508 alloca (sizeof (struct section_offsets)
509 + objfile->num_sections * sizeof (delta->offsets));
513 int something_changed = 0;
514 for (i = 0; i < objfile->num_sections; ++i)
516 ANOFFSET (delta, i) =
517 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
518 if (ANOFFSET (delta, i) != 0)
519 something_changed = 1;
521 if (!something_changed)
525 /* OK, get all the symtabs. */
529 ALL_OBJFILE_SYMTABS (objfile, s)
532 struct blockvector *bv;
535 /* First the line table. */
539 for (i = 0; i < l->nitems; ++i)
540 l->item[i].pc += ANOFFSET (delta, s->block_line_section);
543 /* Don't relocate a shared blockvector more than once. */
547 bv = BLOCKVECTOR (s);
548 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
553 b = BLOCKVECTOR_BLOCK (bv, i);
554 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
555 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
557 for (j = 0; j < BLOCK_NSYMS (b); ++j)
559 struct symbol *sym = BLOCK_SYM (b, j);
560 /* The RS6000 code from which this was taken skipped
561 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
562 But I'm leaving out that test, on the theory that
563 they can't possibly pass the tests below. */
564 if ((SYMBOL_CLASS (sym) == LOC_LABEL
565 || SYMBOL_CLASS (sym) == LOC_STATIC
566 || SYMBOL_CLASS (sym) == LOC_INDIRECT)
567 && SYMBOL_SECTION (sym) >= 0)
569 SYMBOL_VALUE_ADDRESS (sym) +=
570 ANOFFSET (delta, SYMBOL_SECTION (sym));
572 #ifdef MIPS_EFI_SYMBOL_NAME
573 /* Relocate Extra Function Info for ecoff. */
575 else if (SYMBOL_CLASS (sym) == LOC_CONST
576 && SYMBOL_NAMESPACE (sym) == LABEL_NAMESPACE
577 && STRCMP (SYMBOL_NAME (sym), MIPS_EFI_SYMBOL_NAME) == 0)
578 ecoff_relocate_efi (sym, ANOFFSET (delta,
579 s->block_line_section));
587 struct partial_symtab *p;
589 ALL_OBJFILE_PSYMTABS (objfile, p)
591 p->textlow += ANOFFSET (delta, SECT_OFF_TEXT);
592 p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT);
597 struct partial_symbol **psym;
599 for (psym = objfile->global_psymbols.list;
600 psym < objfile->global_psymbols.next;
602 if (SYMBOL_SECTION (*psym) >= 0)
603 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
604 SYMBOL_SECTION (*psym));
605 for (psym = objfile->static_psymbols.list;
606 psym < objfile->static_psymbols.next;
608 if (SYMBOL_SECTION (*psym) >= 0)
609 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
610 SYMBOL_SECTION (*psym));
614 struct minimal_symbol *msym;
615 ALL_OBJFILE_MSYMBOLS (objfile, msym)
616 if (SYMBOL_SECTION (msym) >= 0)
617 SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
619 /* Relocating different sections by different amounts may cause the symbols
620 to be out of order. */
621 msymbols_sort (objfile);
625 for (i = 0; i < objfile->num_sections; ++i)
626 ANOFFSET (objfile->section_offsets, i) = ANOFFSET (new_offsets, i);
630 struct obj_section *s;
633 abfd = objfile->obfd;
635 for (s = objfile->sections;
636 s < objfile->sections_end; ++s)
640 flags = bfd_get_section_flags (abfd, s->the_bfd_section);
642 if (flags & SEC_CODE)
644 s->addr += ANOFFSET (delta, SECT_OFF_TEXT);
645 s->endaddr += ANOFFSET (delta, SECT_OFF_TEXT);
647 else if (flags & (SEC_DATA | SEC_LOAD))
649 s->addr += ANOFFSET (delta, SECT_OFF_DATA);
650 s->endaddr += ANOFFSET (delta, SECT_OFF_DATA);
652 else if (flags & SEC_ALLOC)
654 s->addr += ANOFFSET (delta, SECT_OFF_BSS);
655 s->endaddr += ANOFFSET (delta, SECT_OFF_BSS);
660 if (objfile->ei.entry_point != ~(CORE_ADDR) 0)
661 objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT);
663 if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC)
665 objfile->ei.entry_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT);
666 objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
669 if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC)
671 objfile->ei.entry_file_lowpc += ANOFFSET (delta, SECT_OFF_TEXT);
672 objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
675 if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC)
677 objfile->ei.main_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT);
678 objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
681 /* Relocate breakpoints as necessary, after things are relocated. */
682 breakpoint_re_set ();
685 /* Many places in gdb want to test just to see if we have any partial
686 symbols available. This function returns zero if none are currently
687 available, nonzero otherwise. */
690 have_partial_symbols ()
696 if (ofp->psymtabs != NULL)
704 /* Many places in gdb want to test just to see if we have any full
705 symbols available. This function returns zero if none are currently
706 available, nonzero otherwise. */
715 if (ofp->symtabs != NULL)
724 /* This operations deletes all objfile entries that represent solibs that
725 weren't explicitly loaded by the user, via e.g., the add-symbol-file
729 objfile_purge_solibs ()
731 struct objfile *objf;
732 struct objfile *temp;
734 ALL_OBJFILES_SAFE (objf, temp)
736 /* We assume that the solib package has been purged already, or will
739 if (!objf->user_loaded && objf->is_solib)
745 /* Many places in gdb want to test just to see if we have any minimal
746 symbols available. This function returns zero if none are currently
747 available, nonzero otherwise. */
750 have_minimal_symbols ()
756 if (ofp->msymbols != NULL)
764 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
766 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
767 of the corresponding symbol file in MTIME, try to open an existing file
768 with the name SYMSFILENAME and verify it is more recent than the base
769 file by checking it's timestamp against MTIME.
771 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
773 If SYMSFILENAME does exist, but is out of date, we check to see if the
774 user has specified creation of a mapped file. If so, we don't issue
775 any warning message because we will be creating a new mapped file anyway,
776 overwriting the old one. If not, then we issue a warning message so that
777 the user will know why we aren't using this existing mapped symbol file.
778 In either case, we return -1.
780 If SYMSFILENAME does exist and is not out of date, but can't be opened for
781 some reason, then prints an appropriate system error message and returns -1.
783 Otherwise, returns the open file descriptor. */
786 open_existing_mapped_file (symsfilename, mtime, mapped)
794 if (stat (symsfilename, &sbuf) == 0)
796 if (sbuf.st_mtime < mtime)
800 warning ("mapped symbol file `%s' is out of date, ignored it",
804 else if ((fd = open (symsfilename, O_RDWR)) < 0)
808 printf_unfiltered (error_pre_print);
810 print_sys_errmsg (symsfilename, errno);
816 /* Look for a mapped symbol file that corresponds to FILENAME and is more
817 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
818 use a mapped symbol file for this file, so create a new one if one does
821 If found, then return an open file descriptor for the file, otherwise
824 This routine is responsible for implementing the policy that generates
825 the name of the mapped symbol file from the name of a file containing
826 symbols that gdb would like to read. Currently this policy is to append
827 ".syms" to the name of the file.
829 This routine is also responsible for implementing the policy that
830 determines where the mapped symbol file is found (the search path).
831 This policy is that when reading an existing mapped file, a file of
832 the correct name in the current directory takes precedence over a
833 file of the correct name in the same directory as the symbol file.
834 When creating a new mapped file, it is always created in the current
835 directory. This helps to minimize the chances of a user unknowingly
836 creating big mapped files in places like /bin and /usr/local/bin, and
837 allows a local copy to override a manually installed global copy (in
838 /bin for example). */
841 open_mapped_file (filename, mtime, mapped)
849 /* First try to open an existing file in the current directory, and
850 then try the directory where the symbol file is located. */
852 symsfilename = concat ("./", basename (filename), ".syms", (char *) NULL);
853 if ((fd = open_existing_mapped_file (symsfilename, mtime, mapped)) < 0)
856 symsfilename = concat (filename, ".syms", (char *) NULL);
857 fd = open_existing_mapped_file (symsfilename, mtime, mapped);
860 /* If we don't have an open file by now, then either the file does not
861 already exist, or the base file has changed since it was created. In
862 either case, if the user has specified use of a mapped file, then
863 create a new mapped file, truncating any existing one. If we can't
864 create one, print a system error message saying why we can't.
866 By default the file is rw for everyone, with the user's umask taking
867 care of turning off the permissions the user wants off. */
869 if ((fd < 0) && mapped)
872 symsfilename = concat ("./", basename (filename), ".syms",
874 if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
878 printf_unfiltered (error_pre_print);
880 print_sys_errmsg (symsfilename, errno);
895 md = mmalloc_attach (fd, (PTR) 0);
898 mapto = (CORE_ADDR) mmalloc_getkey (md, 1);
899 md = mmalloc_detach (md);
902 /* FIXME: should figure out why detach failed */
905 else if (mapto != (CORE_ADDR) NULL)
907 /* This mapping file needs to be remapped at "mapto" */
908 md = mmalloc_attach (fd, (PTR) mapto);
912 /* This is a freshly created mapping file. */
913 mapto = (CORE_ADDR) mmalloc_findbase (20 * 1024 * 1024);
916 /* To avoid reusing the freshly created mapping file, at the
917 address selected by mmap, we must truncate it before trying
918 to do an attach at the address we want. */
920 md = mmalloc_attach (fd, (PTR) mapto);
923 mmalloc_setkey (md, 1, (PTR) mapto);
931 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
933 /* Returns a section whose range includes PC and SECTION,
934 or NULL if none found. Note the distinction between the return type,
935 struct obj_section (which is defined in gdb), and the input type
936 struct sec (which is a bfd-defined data type). The obj_section
937 contains a pointer to the bfd struct sec section. */
940 find_pc_sect_section (pc, section)
944 struct obj_section *s;
945 struct objfile *objfile;
947 ALL_OBJFILES (objfile)
948 for (s = objfile->sections; s < objfile->sections_end; ++s)
949 #if defined(HPUXHPPA)
950 if ((section == 0 || section == s->the_bfd_section) &&
951 s->addr <= pc && pc <= s->endaddr)
953 if ((section == 0 || section == s->the_bfd_section) &&
954 s->addr <= pc && pc < s->endaddr)
961 /* Returns a section whose range includes PC or NULL if none found.
962 Backward compatibility, no section. */
968 return find_pc_sect_section (pc, find_pc_mapped_section (pc));
972 /* In SVR4, we recognize a trampoline by it's section name.
973 That is, if the pc is in a section named ".plt" then we are in
977 in_plt_section (pc, name)
981 struct obj_section *s;
984 s = find_pc_section (pc);
987 && s->the_bfd_section->name != NULL
988 && STREQ (s->the_bfd_section->name, ".plt"));