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
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 a flag that indicates
144 whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
145 struct, fill it in as best we can, link it into the list of all known
146 objfiles, and return a pointer to the new objfile struct.
148 USER_LOADED is simply recorded in the objfile. This record offers a way for
149 run_command to remove old objfile entries which are no longer valid (i.e.,
150 are associated with an old inferior), but to preserve ones that the user
151 explicitly loaded via the add-symbol-file command.
153 IS_SOLIB is also simply recorded in the objfile. */
156 allocate_objfile (abfd
, mapped
, user_loaded
, is_solib
)
162 struct objfile
*objfile
= NULL
;
163 struct objfile
*last_one
= NULL
;
165 mapped
|= mapped_symbol_files
;
167 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
171 /* If we can support mapped symbol files, try to open/reopen the
172 mapped file that corresponds to the file from which we wish to
173 read symbols. If the objfile is to be mapped, we must malloc
174 the structure itself using the mmap version, and arrange that
175 all memory allocation for the objfile uses the mmap routines.
176 If we are reusing an existing mapped file, from which we get
177 our objfile pointer, we have to make sure that we update the
178 pointers to the alloc/free functions in the obstack, in case
179 these functions have moved within the current gdb. */
183 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
189 if ((md
= map_to_file (fd
)) == NULL
)
193 else if ((objfile
= (struct objfile
*) mmalloc_getkey (md
, 0)) != NULL
)
195 /* Update memory corruption handler function addresses. */
199 /* Update pointers to functions to *our* copies */
200 obstack_chunkfun (&objfile
->psymbol_cache
.cache
, xmmalloc
);
201 obstack_freefun (&objfile
->psymbol_cache
.cache
, mfree
);
202 obstack_chunkfun (&objfile
->psymbol_obstack
, xmmalloc
);
203 obstack_freefun (&objfile
->psymbol_obstack
, mfree
);
204 obstack_chunkfun (&objfile
->symbol_obstack
, xmmalloc
);
205 obstack_freefun (&objfile
->symbol_obstack
, mfree
);
206 obstack_chunkfun (&objfile
->type_obstack
, xmmalloc
);
207 obstack_freefun (&objfile
->type_obstack
, mfree
);
208 /* If already in objfile list, unlink it. */
209 unlink_objfile (objfile
);
210 /* Forget things specific to a particular gdb, may have changed. */
216 /* Set up to detect internal memory corruption. MUST be
217 done before the first malloc. See comments in
218 init_malloc() and mmcheck(). */
222 objfile
= (struct objfile
*)
223 xmmalloc (md
, sizeof (struct objfile
));
224 memset (objfile
, 0, sizeof (struct objfile
));
227 objfile
->flags
|= OBJF_MAPPED
;
228 mmalloc_setkey (objfile
->md
, 0, objfile
);
229 obstack_specify_allocation_with_arg (&objfile
->psymbol_cache
.cache
,
230 0, 0, xmmalloc
, mfree
,
232 obstack_specify_allocation_with_arg (&objfile
->psymbol_obstack
,
233 0, 0, xmmalloc
, mfree
,
235 obstack_specify_allocation_with_arg (&objfile
->symbol_obstack
,
236 0, 0, xmmalloc
, mfree
,
238 obstack_specify_allocation_with_arg (&objfile
->type_obstack
,
239 0, 0, xmmalloc
, mfree
,
244 if (mapped
&& (objfile
== NULL
))
246 warning ("symbol table for '%s' will not be mapped",
247 bfd_get_filename (abfd
));
250 #else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
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;
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
,
284 /* Update the per-objfile information that comes from the bfd, ensuring
285 that any data that is reference is saved in the per-objfile data
288 objfile
->obfd
= abfd
;
289 if (objfile
->name
!= NULL
)
291 mfree (objfile
->md
, objfile
->name
);
295 objfile
->name
= mstrsave (objfile
->md
, bfd_get_filename (abfd
));
296 objfile
->mtime
= bfd_get_mtime (abfd
);
298 /* Build section table. */
300 if (build_objfile_section_table (objfile
))
302 error ("Can't find the file sections in `%s': %s",
303 objfile
->name
, bfd_errmsg (bfd_get_error ()));
307 /* Add this file onto the tail of the linked list of other such files. */
309 objfile
->next
= NULL
;
310 if (object_files
== NULL
)
311 object_files
= objfile
;
314 for (last_one
= object_files
;
316 last_one
= last_one
->next
);
317 last_one
->next
= objfile
;
320 /* Record whether this objfile was created because the user explicitly
321 caused it (e.g., used the add-symbol-file command).
323 objfile
->user_loaded
= user_loaded
;
325 /* Record whether this objfile definitely represents a solib. */
326 objfile
->is_solib
= is_solib
;
331 /* Put OBJFILE at the front of the list. */
334 objfile_to_front (objfile
)
335 struct objfile
*objfile
;
337 struct objfile
**objp
;
338 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
340 if (*objp
== objfile
)
342 /* Unhook it from where it is. */
343 *objp
= objfile
->next
;
344 /* Put it in the front. */
345 objfile
->next
= object_files
;
346 object_files
= objfile
;
352 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
355 It is not a bug, or error, to call this function if OBJFILE is not known
356 to be in the current list. This is done in the case of mapped objfiles,
357 for example, just to ensure that the mapped objfile doesn't appear twice
358 in the list. Since the list is threaded, linking in a mapped objfile
359 twice would create a circular list.
361 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
362 unlinking it, just to ensure that we have completely severed any linkages
363 between the OBJFILE and the list. */
366 unlink_objfile (objfile
)
367 struct objfile
*objfile
;
369 struct objfile
**objpp
;
371 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
373 if (*objpp
== objfile
)
375 *objpp
= (*objpp
)->next
;
376 objfile
->next
= NULL
;
383 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
384 that as much as possible is allocated on the symbol_obstack and
385 psymbol_obstack, so that the memory can be efficiently freed.
387 Things which we do NOT free because they are not in malloc'd memory
388 or not in memory specific to the objfile include:
392 FIXME: If the objfile is using reusable symbol information (via mmalloc),
393 then we need to take into account the fact that more than one process
394 may be using the symbol information at the same time (when mmalloc is
395 extended to support cooperative locking). When more than one process
396 is using the mapped symbol info, we need to be more careful about when
397 we free objects in the reusable area. */
400 free_objfile (objfile
)
401 struct objfile
*objfile
;
403 /* First do any symbol file specific actions required when we are
404 finished with a particular symbol file. Note that if the objfile
405 is using reusable symbol information (via mmalloc) then each of
406 these routines is responsible for doing the correct thing, either
407 freeing things which are valid only during this particular gdb
408 execution, or leaving them to be reused during the next one. */
410 if (objfile
->sf
!= NULL
)
412 (*objfile
->sf
->sym_finish
) (objfile
);
415 /* We always close the bfd. */
417 if (objfile
->obfd
!= NULL
)
419 char *name
= bfd_get_filename (objfile
->obfd
);
420 if (!bfd_close (objfile
->obfd
))
421 warning ("cannot close \"%s\": %s",
422 name
, bfd_errmsg (bfd_get_error ()));
426 /* Remove it from the chain of all objfiles. */
428 unlink_objfile (objfile
);
430 /* If we are going to free the runtime common objfile, mark it
433 if (objfile
== rt_common_objfile
)
434 rt_common_objfile
= NULL
;
436 /* Before the symbol table code was redone to make it easier to
437 selectively load and remove information particular to a specific
438 linkage unit, gdb used to do these things whenever the monolithic
439 symbol table was blown away. How much still needs to be done
440 is unknown, but we play it safe for now and keep each action until
441 it is shown to be no longer needed. */
443 #if defined (CLEAR_SOLIB)
445 /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
446 the to_sections for a core file might refer to those bfd's. So
447 detach any core file. */
449 struct target_ops
*t
= find_core_target ();
451 (t
->to_detach
) (NULL
, 0);
454 /* I *think* all our callers call clear_symtab_users. If so, no need
455 to call this here. */
456 clear_pc_function_cache ();
458 /* The last thing we do is free the objfile struct itself for the
459 non-reusable case, or detach from the mapped file for the reusable
460 case. Note that the mmalloc_detach or the mfree is the last thing
461 we can do with this objfile. */
463 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
465 if (objfile
->flags
& OBJF_MAPPED
)
467 /* Remember the fd so we can close it. We can't close it before
468 doing the detach, and after the detach the objfile is gone. */
471 mmfd
= objfile
->mmfd
;
472 mmalloc_detach (objfile
->md
);
477 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
479 /* If we still have an objfile, then either we don't support reusable
480 objfiles or this one was not reusable. So free it normally. */
484 if (objfile
->name
!= NULL
)
486 mfree (objfile
->md
, objfile
->name
);
488 if (objfile
->global_psymbols
.list
)
489 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
490 if (objfile
->static_psymbols
.list
)
491 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
492 /* Free the obstacks for non-reusable objfiles */
493 obstack_free (&objfile
->psymbol_cache
.cache
, 0);
494 obstack_free (&objfile
->psymbol_obstack
, 0);
495 obstack_free (&objfile
->symbol_obstack
, 0);
496 obstack_free (&objfile
->type_obstack
, 0);
497 mfree (objfile
->md
, objfile
);
503 /* Free all the object files at once and clean up their users. */
508 struct objfile
*objfile
, *temp
;
510 ALL_OBJFILES_SAFE (objfile
, temp
)
512 free_objfile (objfile
);
514 clear_symtab_users ();
517 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
518 entries in new_offsets. */
520 objfile_relocate (objfile
, new_offsets
)
521 struct objfile
*objfile
;
522 struct section_offsets
*new_offsets
;
524 struct section_offsets
*delta
=
525 (struct section_offsets
*) alloca (SIZEOF_SECTION_OFFSETS
);
529 int something_changed
= 0;
530 for (i
= 0; i
< objfile
->num_sections
; ++i
)
532 ANOFFSET (delta
, i
) =
533 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
534 if (ANOFFSET (delta
, i
) != 0)
535 something_changed
= 1;
537 if (!something_changed
)
541 /* OK, get all the symtabs. */
545 ALL_OBJFILE_SYMTABS (objfile
, s
)
548 struct blockvector
*bv
;
551 /* First the line table. */
555 for (i
= 0; i
< l
->nitems
; ++i
)
556 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
559 /* Don't relocate a shared blockvector more than once. */
563 bv
= BLOCKVECTOR (s
);
564 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
569 b
= BLOCKVECTOR_BLOCK (bv
, i
);
570 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
571 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
573 for (j
= 0; j
< BLOCK_NSYMS (b
); ++j
)
575 struct symbol
*sym
= BLOCK_SYM (b
, j
);
576 /* The RS6000 code from which this was taken skipped
577 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
578 But I'm leaving out that test, on the theory that
579 they can't possibly pass the tests below. */
580 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
581 || SYMBOL_CLASS (sym
) == LOC_STATIC
582 || SYMBOL_CLASS (sym
) == LOC_INDIRECT
)
583 && SYMBOL_SECTION (sym
) >= 0)
585 SYMBOL_VALUE_ADDRESS (sym
) +=
586 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
588 #ifdef MIPS_EFI_SYMBOL_NAME
589 /* Relocate Extra Function Info for ecoff. */
591 else if (SYMBOL_CLASS (sym
) == LOC_CONST
592 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
593 && STRCMP (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
594 ecoff_relocate_efi (sym
, ANOFFSET (delta
,
595 s
->block_line_section
));
603 struct partial_symtab
*p
;
605 ALL_OBJFILE_PSYMTABS (objfile
, p
)
607 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
608 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
613 struct partial_symbol
**psym
;
615 for (psym
= objfile
->global_psymbols
.list
;
616 psym
< objfile
->global_psymbols
.next
;
618 if (SYMBOL_SECTION (*psym
) >= 0)
619 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
620 SYMBOL_SECTION (*psym
));
621 for (psym
= objfile
->static_psymbols
.list
;
622 psym
< objfile
->static_psymbols
.next
;
624 if (SYMBOL_SECTION (*psym
) >= 0)
625 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
626 SYMBOL_SECTION (*psym
));
630 struct minimal_symbol
*msym
;
631 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
632 if (SYMBOL_SECTION (msym
) >= 0)
633 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
635 /* Relocating different sections by different amounts may cause the symbols
636 to be out of order. */
637 msymbols_sort (objfile
);
641 for (i
= 0; i
< objfile
->num_sections
; ++i
)
642 ANOFFSET (objfile
->section_offsets
, i
) = ANOFFSET (new_offsets
, i
);
646 struct obj_section
*s
;
649 abfd
= objfile
->obfd
;
651 ALL_OBJFILE_OSECTIONS (objfile
, s
)
655 flags
= bfd_get_section_flags (abfd
, s
->the_bfd_section
);
657 if (flags
& SEC_CODE
)
659 s
->addr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
660 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
662 else if (flags
& (SEC_DATA
| SEC_LOAD
))
664 s
->addr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
665 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
667 else if (flags
& SEC_ALLOC
)
669 s
->addr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
670 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
675 if (objfile
->ei
.entry_point
!= ~(CORE_ADDR
) 0)
676 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
678 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
680 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
681 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
684 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
686 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
687 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
690 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
692 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
693 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
696 /* Relocate breakpoints as necessary, after things are relocated. */
697 breakpoint_re_set ();
700 /* Many places in gdb want to test just to see if we have any partial
701 symbols available. This function returns zero if none are currently
702 available, nonzero otherwise. */
705 have_partial_symbols ()
711 if (ofp
->psymtabs
!= NULL
)
719 /* Many places in gdb want to test just to see if we have any full
720 symbols available. This function returns zero if none are currently
721 available, nonzero otherwise. */
730 if (ofp
->symtabs
!= NULL
)
739 /* This operations deletes all objfile entries that represent solibs that
740 weren't explicitly loaded by the user, via e.g., the add-symbol-file
744 objfile_purge_solibs ()
746 struct objfile
*objf
;
747 struct objfile
*temp
;
749 ALL_OBJFILES_SAFE (objf
, temp
)
751 /* We assume that the solib package has been purged already, or will
754 if (!objf
->user_loaded
&& objf
->is_solib
)
760 /* Many places in gdb want to test just to see if we have any minimal
761 symbols available. This function returns zero if none are currently
762 available, nonzero otherwise. */
765 have_minimal_symbols ()
771 if (ofp
->msymbols
!= NULL
)
779 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
781 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
782 of the corresponding symbol file in MTIME, try to open an existing file
783 with the name SYMSFILENAME and verify it is more recent than the base
784 file by checking it's timestamp against MTIME.
786 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
788 If SYMSFILENAME does exist, but is out of date, we check to see if the
789 user has specified creation of a mapped file. If so, we don't issue
790 any warning message because we will be creating a new mapped file anyway,
791 overwriting the old one. If not, then we issue a warning message so that
792 the user will know why we aren't using this existing mapped symbol file.
793 In either case, we return -1.
795 If SYMSFILENAME does exist and is not out of date, but can't be opened for
796 some reason, then prints an appropriate system error message and returns -1.
798 Otherwise, returns the open file descriptor. */
801 open_existing_mapped_file (symsfilename
, mtime
, mapped
)
809 if (stat (symsfilename
, &sbuf
) == 0)
811 if (sbuf
.st_mtime
< mtime
)
815 warning ("mapped symbol file `%s' is out of date, ignored it",
819 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
823 printf_unfiltered (error_pre_print
);
825 print_sys_errmsg (symsfilename
, errno
);
831 /* Look for a mapped symbol file that corresponds to FILENAME and is more
832 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
833 use a mapped symbol file for this file, so create a new one if one does
836 If found, then return an open file descriptor for the file, otherwise
839 This routine is responsible for implementing the policy that generates
840 the name of the mapped symbol file from the name of a file containing
841 symbols that gdb would like to read. Currently this policy is to append
842 ".syms" to the name of the file.
844 This routine is also responsible for implementing the policy that
845 determines where the mapped symbol file is found (the search path).
846 This policy is that when reading an existing mapped file, a file of
847 the correct name in the current directory takes precedence over a
848 file of the correct name in the same directory as the symbol file.
849 When creating a new mapped file, it is always created in the current
850 directory. This helps to minimize the chances of a user unknowingly
851 creating big mapped files in places like /bin and /usr/local/bin, and
852 allows a local copy to override a manually installed global copy (in
853 /bin for example). */
856 open_mapped_file (filename
, mtime
, mapped
)
864 /* First try to open an existing file in the current directory, and
865 then try the directory where the symbol file is located. */
867 symsfilename
= concat ("./", basename (filename
), ".syms", (char *) NULL
);
868 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
)) < 0)
871 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
872 fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
);
875 /* If we don't have an open file by now, then either the file does not
876 already exist, or the base file has changed since it was created. In
877 either case, if the user has specified use of a mapped file, then
878 create a new mapped file, truncating any existing one. If we can't
879 create one, print a system error message saying why we can't.
881 By default the file is rw for everyone, with the user's umask taking
882 care of turning off the permissions the user wants off. */
884 if ((fd
< 0) && mapped
)
887 symsfilename
= concat ("./", basename (filename
), ".syms",
889 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
893 printf_unfiltered (error_pre_print
);
895 print_sys_errmsg (symsfilename
, errno
);
910 md
= mmalloc_attach (fd
, (PTR
) 0);
913 mapto
= (CORE_ADDR
) mmalloc_getkey (md
, 1);
914 md
= mmalloc_detach (md
);
917 /* FIXME: should figure out why detach failed */
920 else if (mapto
!= (CORE_ADDR
) NULL
)
922 /* This mapping file needs to be remapped at "mapto" */
923 md
= mmalloc_attach (fd
, (PTR
) mapto
);
927 /* This is a freshly created mapping file. */
928 mapto
= (CORE_ADDR
) mmalloc_findbase (20 * 1024 * 1024);
931 /* To avoid reusing the freshly created mapping file, at the
932 address selected by mmap, we must truncate it before trying
933 to do an attach at the address we want. */
935 md
= mmalloc_attach (fd
, (PTR
) mapto
);
938 mmalloc_setkey (md
, 1, (PTR
) mapto
);
946 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
948 /* Returns a section whose range includes PC and SECTION,
949 or NULL if none found. Note the distinction between the return type,
950 struct obj_section (which is defined in gdb), and the input type
951 struct sec (which is a bfd-defined data type). The obj_section
952 contains a pointer to the bfd struct sec section. */
955 find_pc_sect_section (pc
, section
)
959 struct obj_section
*s
;
960 struct objfile
*objfile
;
962 ALL_OBJSECTIONS (objfile
, s
)
963 #if defined(HPUXHPPA)
964 if ((section
== 0 || section
== s
->the_bfd_section
) &&
965 s
->addr
<= pc
&& pc
<= s
->endaddr
)
967 if ((section
== 0 || section
== s
->the_bfd_section
) &&
968 s
->addr
<= pc
&& pc
< s
->endaddr
)
975 /* Returns a section whose range includes PC or NULL if none found.
976 Backward compatibility, no section. */
982 return find_pc_sect_section (pc
, find_pc_mapped_section (pc
));
986 /* In SVR4, we recognize a trampoline by it's section name.
987 That is, if the pc is in a section named ".plt" then we are in
991 in_plt_section (pc
, name
)
995 struct obj_section
*s
;
998 s
= find_pc_section (pc
);
1001 && s
->the_bfd_section
->name
!= NULL
1002 && STREQ (s
->the_bfd_section
->name
, ".plt"));
1006 /* Return nonzero if NAME is in the import list of OBJFILE. Else
1010 is_in_import_list (name
, objfile
)
1012 struct objfile
*objfile
;
1016 if (!objfile
|| !name
|| !*name
)
1019 for (i
= 0; i
< objfile
->import_list_size
; i
++)
1020 if (objfile
->import_list
[i
] && STREQ (name
, objfile
->import_list
[i
]))