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, Boston, MA 02111-1307, USA. */
21 /* This file contains support routines for creating, manipulating, and
22 destroying objfile structures. */
25 #include "bfd.h" /* Binary File Description */
29 #include "gdb-stabs.h"
32 #include <sys/types.h>
36 #include "gdb_string.h"
38 /* Prototypes for local functions */
40 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
43 open_existing_mapped_file
PARAMS ((char *, long, int));
46 open_mapped_file
PARAMS ((char *filename
, long mtime
, int mapped
));
49 map_to_file
PARAMS ((int));
51 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
54 add_to_objfile_sections
PARAMS ((bfd
*, sec_ptr
, PTR
));
56 /* Externally visible variables that are owned by this module.
57 See declarations in objfile.h for more info. */
59 struct objfile
*object_files
; /* Linked list of all objfiles */
60 struct objfile
*current_objfile
; /* For symbol file being read in */
61 struct objfile
*symfile_objfile
; /* Main symbol table loaded from */
62 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
64 int mapped_symbol_files
; /* Try to use mapped symbol files */
66 /* Locate all mappable sections of a BFD file.
67 objfile_p_char is a char * to get it through
68 bfd_map_over_sections; we cast it back to its proper type. */
71 add_to_objfile_sections (abfd
, asect
, objfile_p_char
)
76 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
77 struct obj_section section
;
80 aflag
= bfd_get_section_flags (abfd
, asect
);
81 if (!(aflag
& SEC_ALLOC
))
83 if (0 == bfd_section_size (abfd
, asect
))
86 section
.objfile
= objfile
;
87 section
.the_bfd_section
= asect
;
88 section
.ovly_mapped
= 0;
89 section
.addr
= bfd_section_vma (abfd
, asect
);
90 section
.endaddr
= section
.addr
+ bfd_section_size (abfd
, asect
);
91 obstack_grow (&objfile
->psymbol_obstack
, (char *) §ion
, sizeof(section
));
92 objfile
->sections_end
= (struct obj_section
*) (((unsigned long) objfile
->sections_end
) + 1);
95 /* Builds a section table for OBJFILE.
96 Returns 0 if OK, 1 on error (in which case bfd_error contains the
100 build_objfile_section_table (objfile
)
101 struct objfile
*objfile
;
103 /* objfile->sections can be already set when reading a mapped symbol
104 file. I believe that we do need to rebuild the section table in
105 this case (we rebuild other things derived from the bfd), but we
106 can't free the old one (it's in the psymbol_obstack). So we just
107 waste some memory. */
109 objfile
->sections_end
= 0;
110 bfd_map_over_sections (objfile
->obfd
, add_to_objfile_sections
, (char *)objfile
);
111 objfile
->sections
= (struct obj_section
*)
112 obstack_finish (&objfile
->psymbol_obstack
);
113 objfile
->sections_end
= objfile
->sections
+ (unsigned long) objfile
->sections_end
;
117 /* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
118 whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
119 struct, fill it in as best we can, link it into the list of all known
120 objfiles, and return a pointer to the new objfile struct. */
123 allocate_objfile (abfd
, mapped
)
127 struct objfile
*objfile
= NULL
;
128 struct objfile
*last_one
= NULL
;
130 mapped
|= mapped_symbol_files
;
132 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
135 /* If we can support mapped symbol files, try to open/reopen the
136 mapped file that corresponds to the file from which we wish to
137 read symbols. If the objfile is to be mapped, we must malloc
138 the structure itself using the mmap version, and arrange that
139 all memory allocation for the objfile uses the mmap routines.
140 If we are reusing an existing mapped file, from which we get
141 our objfile pointer, we have to make sure that we update the
142 pointers to the alloc/free functions in the obstack, in case
143 these functions have moved within the current gdb. */
147 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
153 if ((md
= map_to_file (fd
)) == NULL
)
157 else if ((objfile
= (struct objfile
*) mmalloc_getkey (md
, 0)) != NULL
)
159 /* Update memory corruption handler function addresses. */
162 objfile
-> mmfd
= fd
;
163 /* Update pointers to functions to *our* copies */
164 obstack_chunkfun (&objfile
-> psymbol_cache
.cache
, xmmalloc
);
165 obstack_freefun (&objfile
-> psymbol_cache
.cache
, mfree
);
166 obstack_chunkfun (&objfile
-> psymbol_obstack
, xmmalloc
);
167 obstack_freefun (&objfile
-> psymbol_obstack
, mfree
);
168 obstack_chunkfun (&objfile
-> symbol_obstack
, xmmalloc
);
169 obstack_freefun (&objfile
-> symbol_obstack
, mfree
);
170 obstack_chunkfun (&objfile
-> type_obstack
, xmmalloc
);
171 obstack_freefun (&objfile
-> type_obstack
, mfree
);
172 /* If already in objfile list, unlink it. */
173 unlink_objfile (objfile
);
174 /* Forget things specific to a particular gdb, may have changed. */
175 objfile
-> sf
= NULL
;
180 /* Set up to detect internal memory corruption. MUST be
181 done before the first malloc. See comments in
182 init_malloc() and mmcheck(). */
186 objfile
= (struct objfile
*)
187 xmmalloc (md
, sizeof (struct objfile
));
188 memset (objfile
, 0, sizeof (struct objfile
));
190 objfile
-> mmfd
= fd
;
191 objfile
-> flags
|= OBJF_MAPPED
;
192 mmalloc_setkey (objfile
-> md
, 0, objfile
);
193 obstack_specify_allocation_with_arg (&objfile
-> psymbol_cache
.cache
,
194 0, 0, xmmalloc
, mfree
,
196 obstack_specify_allocation_with_arg (&objfile
-> psymbol_obstack
,
197 0, 0, xmmalloc
, mfree
,
199 obstack_specify_allocation_with_arg (&objfile
-> symbol_obstack
,
200 0, 0, xmmalloc
, mfree
,
202 obstack_specify_allocation_with_arg (&objfile
-> type_obstack
,
203 0, 0, xmmalloc
, mfree
,
208 if (mapped
&& (objfile
== NULL
))
210 warning ("symbol table for '%s' will not be mapped",
211 bfd_get_filename (abfd
));
214 #else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
218 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
220 /* Turn off the global flag so we don't try to do mapped symbol tables
221 any more, which shuts up gdb unless the user specifically gives the
222 "mapped" keyword again. */
224 mapped_symbol_files
= 0;
227 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
229 /* If we don't support mapped symbol files, didn't ask for the file to be
230 mapped, or failed to open the mapped file for some reason, then revert
231 back to an unmapped objfile. */
235 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
236 memset (objfile
, 0, sizeof (struct objfile
));
237 objfile
-> md
= NULL
;
238 obstack_specify_allocation (&objfile
-> psymbol_cache
.cache
, 0, 0,
240 obstack_specify_allocation (&objfile
-> psymbol_obstack
, 0, 0, xmalloc
,
242 obstack_specify_allocation (&objfile
-> symbol_obstack
, 0, 0, xmalloc
,
244 obstack_specify_allocation (&objfile
-> type_obstack
, 0, 0, xmalloc
,
248 /* Update the per-objfile information that comes from the bfd, ensuring
249 that any data that is reference is saved in the per-objfile data
252 objfile
-> obfd
= abfd
;
253 if (objfile
-> name
!= NULL
)
255 mfree (objfile
-> md
, objfile
-> name
);
257 objfile
-> name
= mstrsave (objfile
-> md
, bfd_get_filename (abfd
));
258 objfile
-> mtime
= bfd_get_mtime (abfd
);
260 /* Build section table. */
262 if (build_objfile_section_table (objfile
))
264 error ("Can't find the file sections in `%s': %s",
265 objfile
-> name
, bfd_errmsg (bfd_get_error ()));
268 /* Add this file onto the tail of the linked list of other such files. */
270 objfile
-> next
= NULL
;
271 if (object_files
== NULL
)
272 object_files
= objfile
;
275 for (last_one
= object_files
;
277 last_one
= last_one
-> next
);
278 last_one
-> next
= objfile
;
283 /* Put OBJFILE at the front of the list. */
286 objfile_to_front (objfile
)
287 struct objfile
*objfile
;
289 struct objfile
**objp
;
290 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
292 if (*objp
== objfile
)
294 /* Unhook it from where it is. */
295 *objp
= objfile
->next
;
296 /* Put it in the front. */
297 objfile
->next
= object_files
;
298 object_files
= objfile
;
304 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
307 It is not a bug, or error, to call this function if OBJFILE is not known
308 to be in the current list. This is done in the case of mapped objfiles,
309 for example, just to ensure that the mapped objfile doesn't appear twice
310 in the list. Since the list is threaded, linking in a mapped objfile
311 twice would create a circular list.
313 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
314 unlinking it, just to ensure that we have completely severed any linkages
315 between the OBJFILE and the list. */
318 unlink_objfile (objfile
)
319 struct objfile
*objfile
;
321 struct objfile
** objpp
;
323 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
) -> next
))
325 if (*objpp
== objfile
)
327 *objpp
= (*objpp
) -> next
;
328 objfile
-> next
= NULL
;
335 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
336 that as much as possible is allocated on the symbol_obstack and
337 psymbol_obstack, so that the memory can be efficiently freed.
339 Things which we do NOT free because they are not in malloc'd memory
340 or not in memory specific to the objfile include:
344 FIXME: If the objfile is using reusable symbol information (via mmalloc),
345 then we need to take into account the fact that more than one process
346 may be using the symbol information at the same time (when mmalloc is
347 extended to support cooperative locking). When more than one process
348 is using the mapped symbol info, we need to be more careful about when
349 we free objects in the reusable area. */
352 free_objfile (objfile
)
353 struct objfile
*objfile
;
355 /* First do any symbol file specific actions required when we are
356 finished with a particular symbol file. Note that if the objfile
357 is using reusable symbol information (via mmalloc) then each of
358 these routines is responsible for doing the correct thing, either
359 freeing things which are valid only during this particular gdb
360 execution, or leaving them to be reused during the next one. */
362 if (objfile
-> sf
!= NULL
)
364 (*objfile
-> sf
-> sym_finish
) (objfile
);
367 /* We always close the bfd. */
369 if (objfile
-> obfd
!= NULL
)
371 char *name
= bfd_get_filename (objfile
->obfd
);
372 if (!bfd_close (objfile
-> obfd
))
373 warning ("cannot close \"%s\": %s",
374 name
, bfd_errmsg (bfd_get_error ()));
378 /* Remove it from the chain of all objfiles. */
380 unlink_objfile (objfile
);
382 /* If we are going to free the runtime common objfile, mark it
385 if (objfile
== rt_common_objfile
)
386 rt_common_objfile
= NULL
;
388 /* Before the symbol table code was redone to make it easier to
389 selectively load and remove information particular to a specific
390 linkage unit, gdb used to do these things whenever the monolithic
391 symbol table was blown away. How much still needs to be done
392 is unknown, but we play it safe for now and keep each action until
393 it is shown to be no longer needed. */
395 #if defined (CLEAR_SOLIB)
397 /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
398 the to_sections for a core file might refer to those bfd's. So
399 detach any core file. */
401 struct target_ops
*t
= find_core_target ();
403 (t
->to_detach
) (NULL
, 0);
406 /* I *think* all our callers call clear_symtab_users. If so, no need
407 to call this here. */
408 clear_pc_function_cache ();
410 /* The last thing we do is free the objfile struct itself for the
411 non-reusable case, or detach from the mapped file for the reusable
412 case. Note that the mmalloc_detach or the mfree is the last thing
413 we can do with this objfile. */
415 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
417 if (objfile
-> flags
& OBJF_MAPPED
)
419 /* Remember the fd so we can close it. We can't close it before
420 doing the detach, and after the detach the objfile is gone. */
423 mmfd
= objfile
-> mmfd
;
424 mmalloc_detach (objfile
-> md
);
429 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
431 /* If we still have an objfile, then either we don't support reusable
432 objfiles or this one was not reusable. So free it normally. */
436 if (objfile
-> name
!= NULL
)
438 mfree (objfile
-> md
, objfile
-> name
);
440 if (objfile
->global_psymbols
.list
)
441 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
442 if (objfile
->static_psymbols
.list
)
443 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
444 /* Free the obstacks for non-reusable objfiles */
445 obstack_free (&objfile
-> psymbol_cache
.cache
, 0);
446 obstack_free (&objfile
-> psymbol_obstack
, 0);
447 obstack_free (&objfile
-> symbol_obstack
, 0);
448 obstack_free (&objfile
-> type_obstack
, 0);
449 mfree (objfile
-> md
, objfile
);
455 /* Free all the object files at once and clean up their users. */
460 struct objfile
*objfile
, *temp
;
462 ALL_OBJFILES_SAFE (objfile
, temp
)
464 free_objfile (objfile
);
466 clear_symtab_users ();
469 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
470 entries in new_offsets. */
472 objfile_relocate (objfile
, new_offsets
)
473 struct objfile
*objfile
;
474 struct section_offsets
*new_offsets
;
476 struct section_offsets
*delta
= (struct section_offsets
*)
477 alloca (sizeof (struct section_offsets
)
478 + objfile
->num_sections
* sizeof (delta
->offsets
));
482 int something_changed
= 0;
483 for (i
= 0; i
< objfile
->num_sections
; ++i
)
485 ANOFFSET (delta
, i
) =
486 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
487 if (ANOFFSET (delta
, i
) != 0)
488 something_changed
= 1;
490 if (!something_changed
)
494 /* OK, get all the symtabs. */
498 ALL_OBJFILE_SYMTABS (objfile
, s
)
501 struct blockvector
*bv
;
504 /* First the line table. */
508 for (i
= 0; i
< l
->nitems
; ++i
)
509 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
512 /* Don't relocate a shared blockvector more than once. */
516 bv
= BLOCKVECTOR (s
);
517 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
522 b
= BLOCKVECTOR_BLOCK (bv
, i
);
523 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
524 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
526 for (j
= 0; j
< BLOCK_NSYMS (b
); ++j
)
528 struct symbol
*sym
= BLOCK_SYM (b
, j
);
529 /* The RS6000 code from which this was taken skipped
530 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
531 But I'm leaving out that test, on the theory that
532 they can't possibly pass the tests below. */
533 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
534 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
535 && SYMBOL_SECTION (sym
) >= 0)
537 SYMBOL_VALUE_ADDRESS (sym
) +=
538 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
540 #ifdef MIPS_EFI_SYMBOL_NAME
541 /* Relocate Extra Function Info for ecoff. */
544 if (SYMBOL_CLASS (sym
) == LOC_CONST
545 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
546 && STRCMP (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
547 ecoff_relocate_efi (sym
, ANOFFSET (delta
,
548 s
->block_line_section
));
556 struct partial_symtab
*p
;
558 ALL_OBJFILE_PSYMTABS (objfile
, p
)
560 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
561 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
566 struct partial_symbol
**psym
;
568 for (psym
= objfile
->global_psymbols
.list
;
569 psym
< objfile
->global_psymbols
.next
;
571 if (SYMBOL_SECTION (*psym
) >= 0)
572 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
573 SYMBOL_SECTION (*psym
));
574 for (psym
= objfile
->static_psymbols
.list
;
575 psym
< objfile
->static_psymbols
.next
;
577 if (SYMBOL_SECTION (*psym
) >= 0)
578 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
579 SYMBOL_SECTION (*psym
));
583 struct minimal_symbol
*msym
;
584 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
585 if (SYMBOL_SECTION (msym
) >= 0)
586 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
588 /* Relocating different sections by different amounts may cause the symbols
589 to be out of order. */
590 msymbols_sort (objfile
);
594 for (i
= 0; i
< objfile
->num_sections
; ++i
)
595 ANOFFSET (objfile
->section_offsets
, i
) = ANOFFSET (new_offsets
, i
);
599 struct obj_section
*s
;
602 abfd
= objfile
->obfd
;
604 for (s
= objfile
->sections
;
605 s
< objfile
->sections_end
; ++s
)
609 flags
= bfd_get_section_flags (abfd
, s
->the_bfd_section
);
611 if (flags
& SEC_CODE
)
613 s
->addr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
614 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
616 else if (flags
& (SEC_DATA
| SEC_LOAD
))
618 s
->addr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
619 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
621 else if (flags
& SEC_ALLOC
)
623 s
->addr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
624 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
629 if (objfile
->ei
.entry_point
!= ~0)
630 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
632 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
634 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
635 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
638 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
640 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
641 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
644 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
646 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
647 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
651 /* Many places in gdb want to test just to see if we have any partial
652 symbols available. This function returns zero if none are currently
653 available, nonzero otherwise. */
656 have_partial_symbols ()
662 if (ofp
-> psymtabs
!= NULL
)
670 /* Many places in gdb want to test just to see if we have any full
671 symbols available. This function returns zero if none are currently
672 available, nonzero otherwise. */
681 if (ofp
-> symtabs
!= NULL
)
689 /* Many places in gdb want to test just to see if we have any minimal
690 symbols available. This function returns zero if none are currently
691 available, nonzero otherwise. */
694 have_minimal_symbols ()
700 if (ofp
-> msymbols
!= NULL
)
708 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
710 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
711 of the corresponding symbol file in MTIME, try to open an existing file
712 with the name SYMSFILENAME and verify it is more recent than the base
713 file by checking it's timestamp against MTIME.
715 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
717 If SYMSFILENAME does exist, but is out of date, we check to see if the
718 user has specified creation of a mapped file. If so, we don't issue
719 any warning message because we will be creating a new mapped file anyway,
720 overwriting the old one. If not, then we issue a warning message so that
721 the user will know why we aren't using this existing mapped symbol file.
722 In either case, we return -1.
724 If SYMSFILENAME does exist and is not out of date, but can't be opened for
725 some reason, then prints an appropriate system error message and returns -1.
727 Otherwise, returns the open file descriptor. */
730 open_existing_mapped_file (symsfilename
, mtime
, mapped
)
738 if (stat (symsfilename
, &sbuf
) == 0)
740 if (sbuf
.st_mtime
< mtime
)
744 warning ("mapped symbol file `%s' is out of date, ignored it",
748 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
752 printf_unfiltered (error_pre_print
);
754 print_sys_errmsg (symsfilename
, errno
);
760 /* Look for a mapped symbol file that corresponds to FILENAME and is more
761 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
762 use a mapped symbol file for this file, so create a new one if one does
765 If found, then return an open file descriptor for the file, otherwise
768 This routine is responsible for implementing the policy that generates
769 the name of the mapped symbol file from the name of a file containing
770 symbols that gdb would like to read. Currently this policy is to append
771 ".syms" to the name of the file.
773 This routine is also responsible for implementing the policy that
774 determines where the mapped symbol file is found (the search path).
775 This policy is that when reading an existing mapped file, a file of
776 the correct name in the current directory takes precedence over a
777 file of the correct name in the same directory as the symbol file.
778 When creating a new mapped file, it is always created in the current
779 directory. This helps to minimize the chances of a user unknowingly
780 creating big mapped files in places like /bin and /usr/local/bin, and
781 allows a local copy to override a manually installed global copy (in
782 /bin for example). */
785 open_mapped_file (filename
, mtime
, mapped
)
793 /* First try to open an existing file in the current directory, and
794 then try the directory where the symbol file is located. */
796 symsfilename
= concat ("./", basename (filename
), ".syms", (char *) NULL
);
797 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
)) < 0)
800 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
801 fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
);
804 /* If we don't have an open file by now, then either the file does not
805 already exist, or the base file has changed since it was created. In
806 either case, if the user has specified use of a mapped file, then
807 create a new mapped file, truncating any existing one. If we can't
808 create one, print a system error message saying why we can't.
810 By default the file is rw for everyone, with the user's umask taking
811 care of turning off the permissions the user wants off. */
813 if ((fd
< 0) && mapped
)
816 symsfilename
= concat ("./", basename (filename
), ".syms",
818 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
822 printf_unfiltered (error_pre_print
);
824 print_sys_errmsg (symsfilename
, errno
);
839 md
= mmalloc_attach (fd
, (PTR
) 0);
842 mapto
= (CORE_ADDR
) mmalloc_getkey (md
, 1);
843 md
= mmalloc_detach (md
);
846 /* FIXME: should figure out why detach failed */
849 else if (mapto
!= (CORE_ADDR
) NULL
)
851 /* This mapping file needs to be remapped at "mapto" */
852 md
= mmalloc_attach (fd
, (PTR
) mapto
);
856 /* This is a freshly created mapping file. */
857 mapto
= (CORE_ADDR
) mmalloc_findbase (20 * 1024 * 1024);
860 /* To avoid reusing the freshly created mapping file, at the
861 address selected by mmap, we must truncate it before trying
862 to do an attach at the address we want. */
864 md
= mmalloc_attach (fd
, (PTR
) mapto
);
867 mmalloc_setkey (md
, 1, (PTR
) mapto
);
875 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
877 /* Returns a section whose range includes PC and SECTION,
878 or NULL if none found. Note the distinction between the return type,
879 struct obj_section (which is defined in gdb), and the input type
880 struct sec (which is a bfd-defined data type). The obj_section
881 contains a pointer to the bfd struct sec section. */
884 find_pc_sect_section (pc
, section
)
888 struct obj_section
*s
;
889 struct objfile
*objfile
;
891 ALL_OBJFILES (objfile
)
892 for (s
= objfile
->sections
; s
< objfile
->sections_end
; ++s
)
893 if ((section
== 0 || section
== s
->the_bfd_section
) &&
894 s
->addr
<= pc
&& pc
< s
->endaddr
)
900 /* Returns a section whose range includes PC or NULL if none found.
901 Backward compatibility, no section. */
907 return find_pc_sect_section (pc
, find_pc_mapped_section (pc
));
911 /* In SVR4, we recognize a trampoline by it's section name.
912 That is, if the pc is in a section named ".plt" then we are in
916 in_plt_section(pc
, name
)
920 struct obj_section
*s
;
923 s
= find_pc_section(pc
);
926 && s
->the_bfd_section
->name
!= NULL
927 && STREQ (s
->the_bfd_section
->name
, ".plt"));