1 /* GDB routines for manipulating objfiles.
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Contributed by Cygnus Support, using pieces from other GDB modules.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* This file contains support routines for creating, manipulating, and
24 destroying objfile structures. */
27 #include "bfd.h" /* Binary File Description */
31 #include "gdb-stabs.h"
34 #include <sys/types.h>
38 #include "gdb_string.h"
40 #include "breakpoint.h"
42 /* Prototypes for local functions */
44 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
48 static int open_existing_mapped_file (char *, long, int);
50 static int open_mapped_file (char *filename
, long mtime
, int flags
);
52 static PTR
map_to_file (int);
54 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
56 static void add_to_objfile_sections (bfd
*, sec_ptr
, PTR
);
58 /* Externally visible variables that are owned by this module.
59 See declarations in objfile.h for more info. */
61 struct objfile
*object_files
; /* Linked list of all objfiles */
62 struct objfile
*current_objfile
; /* For symbol file being read in */
63 struct objfile
*symfile_objfile
; /* Main symbol table loaded from */
64 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
66 int mapped_symbol_files
; /* Try to use mapped symbol files */
68 /* Locate all mappable sections of a BFD file.
69 objfile_p_char is a char * to get it through
70 bfd_map_over_sections; we cast it back to its proper type. */
72 #ifndef TARGET_KEEP_SECTION
73 #define TARGET_KEEP_SECTION(ASECT) 0
76 /* Called via bfd_map_over_sections to build up the section table that
77 the objfile references. The objfile contains pointers to the start
78 of the table (objfile->sections) and to the first location after
79 the end of the table (objfile->sections_end). */
82 add_to_objfile_sections (bfd
*abfd
, sec_ptr asect
, PTR objfile_p_char
)
84 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
85 struct obj_section section
;
88 aflag
= bfd_get_section_flags (abfd
, asect
);
90 if (!(aflag
& SEC_ALLOC
) && !(TARGET_KEEP_SECTION (asect
)))
93 if (0 == bfd_section_size (abfd
, asect
))
96 section
.objfile
= objfile
;
97 section
.the_bfd_section
= asect
;
98 section
.ovly_mapped
= 0;
99 section
.addr
= bfd_section_vma (abfd
, asect
);
100 section
.endaddr
= section
.addr
+ bfd_section_size (abfd
, asect
);
101 obstack_grow (&objfile
->psymbol_obstack
, (char *) §ion
, sizeof (section
));
102 objfile
->sections_end
= (struct obj_section
*) (((unsigned long) objfile
->sections_end
) + 1);
105 /* Builds a section table for OBJFILE.
106 Returns 0 if OK, 1 on error (in which case bfd_error contains the
109 Note that while we are building the table, which goes into the
110 psymbol obstack, we hijack the sections_end pointer to instead hold
111 a count of the number of sections. When bfd_map_over_sections
112 returns, this count is used to compute the pointer to the end of
113 the sections table, which then overwrites the count.
115 Also note that the OFFSET and OVLY_MAPPED in each table entry
116 are initialized to zero.
118 Also note that if anything else writes to the psymbol obstack while
119 we are building the table, we're pretty much hosed. */
122 build_objfile_section_table (struct objfile
*objfile
)
124 /* objfile->sections can be already set when reading a mapped symbol
125 file. I believe that we do need to rebuild the section table in
126 this case (we rebuild other things derived from the bfd), but we
127 can't free the old one (it's in the psymbol_obstack). So we just
128 waste some memory. */
130 objfile
->sections_end
= 0;
131 bfd_map_over_sections (objfile
->obfd
, add_to_objfile_sections
, (char *) objfile
);
132 objfile
->sections
= (struct obj_section
*)
133 obstack_finish (&objfile
->psymbol_obstack
);
134 objfile
->sections_end
= objfile
->sections
+ (unsigned long) objfile
->sections_end
;
138 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
139 allocate a new objfile struct, fill it in as best we can, link it
140 into the list of all known objfiles, and return a pointer to the
143 The FLAGS word contains various bits (OBJF_*) that can be taken as
144 requests for specific operations, like trying to open a mapped
145 version of the objfile (OBJF_MAPPED). Other bits like
146 OBJF_SHARED are simply copied through to the new objfile flags
150 allocate_objfile (bfd
*abfd
, int flags
)
152 struct objfile
*objfile
= NULL
;
153 struct objfile
*last_one
= NULL
;
155 if (mapped_symbol_files
)
156 flags
|= OBJF_MAPPED
;
158 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
162 /* If we can support mapped symbol files, try to open/reopen the
163 mapped file that corresponds to the file from which we wish to
164 read symbols. If the objfile is to be mapped, we must malloc
165 the structure itself using the mmap version, and arrange that
166 all memory allocation for the objfile uses the mmap routines.
167 If we are reusing an existing mapped file, from which we get
168 our objfile pointer, we have to make sure that we update the
169 pointers to the alloc/free functions in the obstack, in case
170 these functions have moved within the current gdb. */
174 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
180 if ((md
= map_to_file (fd
)) == NULL
)
184 else if ((objfile
= (struct objfile
*) mmalloc_getkey (md
, 0)) != NULL
)
186 /* Update memory corruption handler function addresses. */
190 /* Update pointers to functions to *our* copies */
191 obstack_chunkfun (&objfile
->psymbol_cache
.cache
, xmmalloc
);
192 obstack_freefun (&objfile
->psymbol_cache
.cache
, xmfree
);
193 obstack_chunkfun (&objfile
->psymbol_obstack
, xmmalloc
);
194 obstack_freefun (&objfile
->psymbol_obstack
, xmfree
);
195 obstack_chunkfun (&objfile
->symbol_obstack
, xmmalloc
);
196 obstack_freefun (&objfile
->symbol_obstack
, xmfree
);
197 obstack_chunkfun (&objfile
->type_obstack
, xmmalloc
);
198 obstack_freefun (&objfile
->type_obstack
, xmfree
);
199 /* If already in objfile list, unlink it. */
200 unlink_objfile (objfile
);
201 /* Forget things specific to a particular gdb, may have changed. */
207 /* Set up to detect internal memory corruption. MUST be
208 done before the first malloc. See comments in
209 init_malloc() and mmcheck(). */
213 objfile
= (struct objfile
*)
214 xmmalloc (md
, sizeof (struct objfile
));
215 memset (objfile
, 0, sizeof (struct objfile
));
218 objfile
->flags
|= OBJF_MAPPED
;
219 mmalloc_setkey (objfile
->md
, 0, objfile
);
220 obstack_specify_allocation_with_arg (&objfile
->psymbol_cache
.cache
,
221 0, 0, xmmalloc
, xmfree
,
223 obstack_specify_allocation_with_arg (&objfile
->psymbol_obstack
,
224 0, 0, xmmalloc
, xmfree
,
226 obstack_specify_allocation_with_arg (&objfile
->symbol_obstack
,
227 0, 0, xmmalloc
, xmfree
,
229 obstack_specify_allocation_with_arg (&objfile
->type_obstack
,
230 0, 0, xmmalloc
, xmfree
,
235 if ((flags
& OBJF_MAPPED
) && (objfile
== NULL
))
237 warning ("symbol table for '%s' will not be mapped",
238 bfd_get_filename (abfd
));
239 flags
&= ~OBJF_MAPPED
;
242 #else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
244 if (flags
& OBJF_MAPPED
)
246 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
248 /* Turn off the global flag so we don't try to do mapped symbol tables
249 any more, which shuts up gdb unless the user specifically gives the
250 "mapped" keyword again. */
252 mapped_symbol_files
= 0;
253 flags
&= ~OBJF_MAPPED
;
256 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
258 /* If we don't support mapped symbol files, didn't ask for the file to be
259 mapped, or failed to open the mapped file for some reason, then revert
260 back to an unmapped objfile. */
264 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
265 memset (objfile
, 0, sizeof (struct objfile
));
267 obstack_specify_allocation (&objfile
->psymbol_cache
.cache
, 0, 0,
269 obstack_specify_allocation (&objfile
->psymbol_obstack
, 0, 0, xmalloc
,
271 obstack_specify_allocation (&objfile
->symbol_obstack
, 0, 0, xmalloc
,
273 obstack_specify_allocation (&objfile
->type_obstack
, 0, 0, xmalloc
,
275 flags
&= ~OBJF_MAPPED
;
278 /* Update the per-objfile information that comes from the bfd, ensuring
279 that any data that is reference is saved in the per-objfile data
282 objfile
->obfd
= abfd
;
283 if (objfile
->name
!= NULL
)
285 xmfree (objfile
->md
, objfile
->name
);
289 objfile
->name
= mstrsave (objfile
->md
, bfd_get_filename (abfd
));
290 objfile
->mtime
= bfd_get_mtime (abfd
);
292 /* Build section table. */
294 if (build_objfile_section_table (objfile
))
296 error ("Can't find the file sections in `%s': %s",
297 objfile
->name
, bfd_errmsg (bfd_get_error ()));
301 /* Initialize the section indexes for this objfile, so that we can
302 later detect if they are used w/o being properly assigned to. */
304 objfile
->sect_index_text
= -1;
305 objfile
->sect_index_data
= -1;
306 objfile
->sect_index_bss
= -1;
307 objfile
->sect_index_rodata
= -1;
309 /* Add this file onto the tail of the linked list of other such files. */
311 objfile
->next
= NULL
;
312 if (object_files
== NULL
)
313 object_files
= objfile
;
316 for (last_one
= object_files
;
318 last_one
= last_one
->next
);
319 last_one
->next
= objfile
;
322 /* Save passed in flag bits. */
323 objfile
->flags
|= flags
;
328 /* Put OBJFILE at the front of the list. */
331 objfile_to_front (struct objfile
*objfile
)
333 struct objfile
**objp
;
334 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
336 if (*objp
== objfile
)
338 /* Unhook it from where it is. */
339 *objp
= objfile
->next
;
340 /* Put it in the front. */
341 objfile
->next
= object_files
;
342 object_files
= objfile
;
348 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
351 It is not a bug, or error, to call this function if OBJFILE is not known
352 to be in the current list. This is done in the case of mapped objfiles,
353 for example, just to ensure that the mapped objfile doesn't appear twice
354 in the list. Since the list is threaded, linking in a mapped objfile
355 twice would create a circular list.
357 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
358 unlinking it, just to ensure that we have completely severed any linkages
359 between the OBJFILE and the list. */
362 unlink_objfile (struct objfile
*objfile
)
364 struct objfile
**objpp
;
366 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
368 if (*objpp
== objfile
)
370 *objpp
= (*objpp
)->next
;
371 objfile
->next
= NULL
;
376 internal_error (__FILE__
, __LINE__
,
377 "unlink_objfile: objfile already unlinked");
381 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
382 that as much as possible is allocated on the symbol_obstack and
383 psymbol_obstack, so that the memory can be efficiently freed.
385 Things which we do NOT free because they are not in malloc'd memory
386 or not in memory specific to the objfile include:
390 FIXME: If the objfile is using reusable symbol information (via mmalloc),
391 then we need to take into account the fact that more than one process
392 may be using the symbol information at the same time (when mmalloc is
393 extended to support cooperative locking). When more than one process
394 is using the mapped symbol info, we need to be more careful about when
395 we free objects in the reusable area. */
398 free_objfile (struct objfile
*objfile
)
400 /* First do any symbol file specific actions required when we are
401 finished with a particular symbol file. Note that if the objfile
402 is using reusable symbol information (via mmalloc) then each of
403 these routines is responsible for doing the correct thing, either
404 freeing things which are valid only during this particular gdb
405 execution, or leaving them to be reused during the next one. */
407 if (objfile
->sf
!= NULL
)
409 (*objfile
->sf
->sym_finish
) (objfile
);
412 /* We always close the bfd. */
414 if (objfile
->obfd
!= NULL
)
416 char *name
= bfd_get_filename (objfile
->obfd
);
417 if (!bfd_close (objfile
->obfd
))
418 warning ("cannot close \"%s\": %s",
419 name
, bfd_errmsg (bfd_get_error ()));
423 /* Remove it from the chain of all objfiles. */
425 unlink_objfile (objfile
);
427 /* If we are going to free the runtime common objfile, mark it
430 if (objfile
== rt_common_objfile
)
431 rt_common_objfile
= NULL
;
433 /* Before the symbol table code was redone to make it easier to
434 selectively load and remove information particular to a specific
435 linkage unit, gdb used to do these things whenever the monolithic
436 symbol table was blown away. How much still needs to be done
437 is unknown, but we play it safe for now and keep each action until
438 it is shown to be no longer needed. */
440 /* I *think* all our callers call clear_symtab_users. If so, no need
441 to call this here. */
442 clear_pc_function_cache ();
444 /* The last thing we do is free the objfile struct itself for the
445 non-reusable case, or detach from the mapped file for the
446 reusable case. Note that the mmalloc_detach or the xmfree() is
447 the last thing we can do with this objfile. */
449 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
451 if (objfile
->flags
& OBJF_MAPPED
)
453 /* Remember the fd so we can close it. We can't close it before
454 doing the detach, and after the detach the objfile is gone. */
457 mmfd
= objfile
->mmfd
;
458 mmalloc_detach (objfile
->md
);
463 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
465 /* If we still have an objfile, then either we don't support reusable
466 objfiles or this one was not reusable. So free it normally. */
470 if (objfile
->name
!= NULL
)
472 xmfree (objfile
->md
, objfile
->name
);
474 if (objfile
->global_psymbols
.list
)
475 xmfree (objfile
->md
, objfile
->global_psymbols
.list
);
476 if (objfile
->static_psymbols
.list
)
477 xmfree (objfile
->md
, objfile
->static_psymbols
.list
);
478 /* Free the obstacks for non-reusable objfiles */
479 free_bcache (&objfile
->psymbol_cache
);
480 obstack_free (&objfile
->psymbol_obstack
, 0);
481 obstack_free (&objfile
->symbol_obstack
, 0);
482 obstack_free (&objfile
->type_obstack
, 0);
483 xmfree (objfile
->md
, objfile
);
489 do_free_objfile_cleanup (void *obj
)
495 make_cleanup_free_objfile (struct objfile
*obj
)
497 return make_cleanup (do_free_objfile_cleanup
, obj
);
500 /* Free all the object files at once and clean up their users. */
503 free_all_objfiles (void)
505 struct objfile
*objfile
, *temp
;
507 ALL_OBJFILES_SAFE (objfile
, temp
)
509 free_objfile (objfile
);
511 clear_symtab_users ();
514 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
515 entries in new_offsets. */
517 objfile_relocate (struct objfile
*objfile
, 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
)
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
)
565 b
= BLOCKVECTOR_BLOCK (bv
, i
);
566 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
567 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
569 ALL_BLOCK_SYMBOLS (b
, j
, sym
)
571 fixup_symbol_section (sym
, objfile
);
573 /* The RS6000 code from which this was taken skipped
574 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
575 But I'm leaving out that test, on the theory that
576 they can't possibly pass the tests below. */
577 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
578 || SYMBOL_CLASS (sym
) == LOC_STATIC
579 || SYMBOL_CLASS (sym
) == LOC_INDIRECT
)
580 && SYMBOL_SECTION (sym
) >= 0)
582 SYMBOL_VALUE_ADDRESS (sym
) +=
583 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
585 #ifdef MIPS_EFI_SYMBOL_NAME
586 /* Relocate Extra Function Info for ecoff. */
588 else if (SYMBOL_CLASS (sym
) == LOC_CONST
589 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
590 && strcmp (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
591 ecoff_relocate_efi (sym
, ANOFFSET (delta
,
592 s
->block_line_section
));
600 struct partial_symtab
*p
;
602 ALL_OBJFILE_PSYMTABS (objfile
, p
)
604 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
605 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
610 struct partial_symbol
**psym
;
612 for (psym
= objfile
->global_psymbols
.list
;
613 psym
< objfile
->global_psymbols
.next
;
616 fixup_psymbol_section (*psym
, objfile
);
617 if (SYMBOL_SECTION (*psym
) >= 0)
618 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
619 SYMBOL_SECTION (*psym
));
621 for (psym
= objfile
->static_psymbols
.list
;
622 psym
< objfile
->static_psymbols
.next
;
625 fixup_psymbol_section (*psym
, objfile
);
626 if (SYMBOL_SECTION (*psym
) >= 0)
627 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
628 SYMBOL_SECTION (*psym
));
633 struct minimal_symbol
*msym
;
634 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
635 if (SYMBOL_SECTION (msym
) >= 0)
636 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
638 /* Relocating different sections by different amounts may cause the symbols
639 to be out of order. */
640 msymbols_sort (objfile
);
644 for (i
= 0; i
< objfile
->num_sections
; ++i
)
645 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
648 if (objfile
->ei
.entry_point
!= ~(CORE_ADDR
) 0)
650 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
651 only as a fallback. */
652 struct obj_section
*s
;
653 s
= find_pc_section (objfile
->ei
.entry_point
);
655 objfile
->ei
.entry_point
+= ANOFFSET (delta
, s
->the_bfd_section
->index
);
657 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
661 struct obj_section
*s
;
664 abfd
= objfile
->obfd
;
666 ALL_OBJFILE_OSECTIONS (objfile
, s
)
668 int idx
= s
->the_bfd_section
->index
;
670 s
->addr
+= ANOFFSET (delta
, idx
);
671 s
->endaddr
+= ANOFFSET (delta
, idx
);
675 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
677 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
678 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
681 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
683 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
684 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
687 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
689 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
690 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
693 /* Relocate breakpoints as necessary, after things are relocated. */
694 breakpoint_re_set ();
697 /* Many places in gdb want to test just to see if we have any partial
698 symbols available. This function returns zero if none are currently
699 available, nonzero otherwise. */
702 have_partial_symbols (void)
708 if (ofp
->psymtabs
!= NULL
)
716 /* Many places in gdb want to test just to see if we have any full
717 symbols available. This function returns zero if none are currently
718 available, nonzero otherwise. */
721 have_full_symbols (void)
727 if (ofp
->symtabs
!= NULL
)
736 /* This operations deletes all objfile entries that represent solibs that
737 weren't explicitly loaded by the user, via e.g., the add-symbol-file
741 objfile_purge_solibs (void)
743 struct objfile
*objf
;
744 struct objfile
*temp
;
746 ALL_OBJFILES_SAFE (objf
, temp
)
748 /* We assume that the solib package has been purged already, or will
751 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
757 /* Many places in gdb want to test just to see if we have any minimal
758 symbols available. This function returns zero if none are currently
759 available, nonzero otherwise. */
762 have_minimal_symbols (void)
768 if (ofp
->msymbols
!= NULL
)
776 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
778 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
779 of the corresponding symbol file in MTIME, try to open an existing file
780 with the name SYMSFILENAME and verify it is more recent than the base
781 file by checking it's timestamp against MTIME.
783 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
785 If SYMSFILENAME does exist, but is out of date, we check to see if the
786 user has specified creation of a mapped file. If so, we don't issue
787 any warning message because we will be creating a new mapped file anyway,
788 overwriting the old one. If not, then we issue a warning message so that
789 the user will know why we aren't using this existing mapped symbol file.
790 In either case, we return -1.
792 If SYMSFILENAME does exist and is not out of date, but can't be opened for
793 some reason, then prints an appropriate system error message and returns -1.
795 Otherwise, returns the open file descriptor. */
798 open_existing_mapped_file (char *symsfilename
, long mtime
, int flags
)
803 if (stat (symsfilename
, &sbuf
) == 0)
805 if (sbuf
.st_mtime
< mtime
)
807 if (!(flags
& OBJF_MAPPED
))
809 warning ("mapped symbol file `%s' is out of date, ignored it",
813 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
817 printf_unfiltered (error_pre_print
);
819 print_sys_errmsg (symsfilename
, errno
);
825 /* Look for a mapped symbol file that corresponds to FILENAME and is more
826 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
827 use a mapped symbol file for this file, so create a new one if one does
830 If found, then return an open file descriptor for the file, otherwise
833 This routine is responsible for implementing the policy that generates
834 the name of the mapped symbol file from the name of a file containing
835 symbols that gdb would like to read. Currently this policy is to append
836 ".syms" to the name of the file.
838 This routine is also responsible for implementing the policy that
839 determines where the mapped symbol file is found (the search path).
840 This policy is that when reading an existing mapped file, a file of
841 the correct name in the current directory takes precedence over a
842 file of the correct name in the same directory as the symbol file.
843 When creating a new mapped file, it is always created in the current
844 directory. This helps to minimize the chances of a user unknowingly
845 creating big mapped files in places like /bin and /usr/local/bin, and
846 allows a local copy to override a manually installed global copy (in
847 /bin for example). */
850 open_mapped_file (char *filename
, long mtime
, int flags
)
855 /* First try to open an existing file in the current directory, and
856 then try the directory where the symbol file is located. */
858 symsfilename
= concat ("./", lbasename (filename
), ".syms", (char *) NULL
);
859 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, flags
)) < 0)
861 xfree (symsfilename
);
862 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
863 fd
= open_existing_mapped_file (symsfilename
, mtime
, flags
);
866 /* If we don't have an open file by now, then either the file does not
867 already exist, or the base file has changed since it was created. In
868 either case, if the user has specified use of a mapped file, then
869 create a new mapped file, truncating any existing one. If we can't
870 create one, print a system error message saying why we can't.
872 By default the file is rw for everyone, with the user's umask taking
873 care of turning off the permissions the user wants off. */
875 if ((fd
< 0) && (flags
& OBJF_MAPPED
))
877 xfree (symsfilename
);
878 symsfilename
= concat ("./", lbasename (filename
), ".syms",
880 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
884 printf_unfiltered (error_pre_print
);
886 print_sys_errmsg (symsfilename
, errno
);
890 xfree (symsfilename
);
900 md
= mmalloc_attach (fd
, (PTR
) 0);
903 mapto
= (CORE_ADDR
) mmalloc_getkey (md
, 1);
904 md
= mmalloc_detach (md
);
907 /* FIXME: should figure out why detach failed */
910 else if (mapto
!= (CORE_ADDR
) NULL
)
912 /* This mapping file needs to be remapped at "mapto" */
913 md
= mmalloc_attach (fd
, (PTR
) mapto
);
917 /* This is a freshly created mapping file. */
918 mapto
= (CORE_ADDR
) mmalloc_findbase (20 * 1024 * 1024);
921 /* To avoid reusing the freshly created mapping file, at the
922 address selected by mmap, we must truncate it before trying
923 to do an attach at the address we want. */
925 md
= mmalloc_attach (fd
, (PTR
) mapto
);
928 mmalloc_setkey (md
, 1, (PTR
) mapto
);
936 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
938 /* Returns a section whose range includes PC and SECTION,
939 or NULL if none found. Note the distinction between the return type,
940 struct obj_section (which is defined in gdb), and the input type
941 struct sec (which is a bfd-defined data type). The obj_section
942 contains a pointer to the bfd struct sec section. */
945 find_pc_sect_section (CORE_ADDR pc
, struct sec
*section
)
947 struct obj_section
*s
;
948 struct objfile
*objfile
;
950 ALL_OBJSECTIONS (objfile
, s
)
951 if ((section
== 0 || section
== s
->the_bfd_section
) &&
952 s
->addr
<= pc
&& pc
< s
->endaddr
)
958 /* Returns a section whose range includes PC or NULL if none found.
959 Backward compatibility, no section. */
962 find_pc_section (CORE_ADDR pc
)
964 return find_pc_sect_section (pc
, find_pc_mapped_section (pc
));
968 /* In SVR4, we recognize a trampoline by it's section name.
969 That is, if the pc is in a section named ".plt" then we are in
973 in_plt_section (CORE_ADDR pc
, char *name
)
975 struct obj_section
*s
;
978 s
= find_pc_section (pc
);
981 && s
->the_bfd_section
->name
!= NULL
982 && STREQ (s
->the_bfd_section
->name
, ".plt"));
986 /* Return nonzero if NAME is in the import list of OBJFILE. Else
990 is_in_import_list (char *name
, struct objfile
*objfile
)
994 if (!objfile
|| !name
|| !*name
)
997 for (i
= 0; i
< objfile
->import_list_size
; i
++)
998 if (objfile
->import_list
[i
] && STREQ (name
, objfile
->import_list
[i
]))
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