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 /* FIXME: imported from mdebugread.c */
40 extern void ecoff_relocate_efi
PARAMS ((struct symbol
*, CORE_ADDR
));
42 /* Prototypes for local functions */
44 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
47 open_existing_mapped_file
PARAMS ((char *, long, int));
50 open_mapped_file
PARAMS ((char *filename
, long mtime
, int mapped
));
53 map_to_file
PARAMS ((int));
55 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
58 add_to_objfile_sections
PARAMS ((bfd
*, sec_ptr
, PTR
));
60 /* Externally visible variables that are owned by this module.
61 See declarations in objfile.h for more info. */
63 struct objfile
*object_files
; /* Linked list of all objfiles */
64 struct objfile
*current_objfile
; /* For symbol file being read in */
65 struct objfile
*symfile_objfile
; /* Main symbol table loaded from */
66 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
68 int mapped_symbol_files
; /* Try to use mapped symbol files */
70 /* Locate all mappable sections of a BFD file.
71 objfile_p_char is a char * to get it through
72 bfd_map_over_sections; we cast it back to its proper type. */
75 add_to_objfile_sections (abfd
, asect
, objfile_p_char
)
80 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
81 struct obj_section section
;
84 aflag
= bfd_get_section_flags (abfd
, asect
);
85 if (!(aflag
& SEC_ALLOC
))
87 if (0 == bfd_section_size (abfd
, asect
))
90 section
.objfile
= objfile
;
91 section
.the_bfd_section
= asect
;
92 section
.addr
= bfd_section_vma (abfd
, asect
);
93 section
.endaddr
= section
.addr
+ bfd_section_size (abfd
, asect
);
94 obstack_grow (&objfile
->psymbol_obstack
, (char *) §ion
, sizeof(section
));
95 objfile
->sections_end
= (struct obj_section
*) (((unsigned long) objfile
->sections_end
) + 1);
98 /* Builds a section table for OBJFILE.
99 Returns 0 if OK, 1 on error (in which case bfd_error contains the
103 build_objfile_section_table (objfile
)
104 struct objfile
*objfile
;
106 /* objfile->sections can be already set when reading a mapped symbol
107 file. I believe that we do need to rebuild the section table in
108 this case (we rebuild other things derived from the bfd), but we
109 can't free the old one (it's in the psymbol_obstack). So we just
110 waste some memory. */
112 objfile
->sections_end
= 0;
113 bfd_map_over_sections (objfile
->obfd
, add_to_objfile_sections
, (char *)objfile
);
114 objfile
->sections
= (struct obj_section
*)
115 obstack_finish (&objfile
->psymbol_obstack
);
116 objfile
->sections_end
= objfile
->sections
+ (unsigned long) objfile
->sections_end
;
120 /* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
121 whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
122 struct, fill it in as best we can, link it into the list of all known
123 objfiles, and return a pointer to the new objfile struct. */
126 allocate_objfile (abfd
, mapped
)
130 struct objfile
*objfile
= NULL
;
131 struct objfile
*last_one
= NULL
;
133 mapped
|= mapped_symbol_files
;
135 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
138 /* If we can support mapped symbol files, try to open/reopen the
139 mapped file that corresponds to the file from which we wish to
140 read symbols. If the objfile is to be mapped, we must malloc
141 the structure itself using the mmap version, and arrange that
142 all memory allocation for the objfile uses the mmap routines.
143 If we are reusing an existing mapped file, from which we get
144 our objfile pointer, we have to make sure that we update the
145 pointers to the alloc/free functions in the obstack, in case
146 these functions have moved within the current gdb. */
150 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
156 if ((md
= map_to_file (fd
)) == NULL
)
160 else if ((objfile
= (struct objfile
*) mmalloc_getkey (md
, 0)) != NULL
)
162 /* Update memory corruption handler function addresses. */
165 objfile
-> mmfd
= fd
;
166 /* Update pointers to functions to *our* copies */
167 obstack_chunkfun (&objfile
-> psymbol_cache
.cache
, xmmalloc
);
168 obstack_freefun (&objfile
-> psymbol_cache
.cache
, mfree
);
169 obstack_chunkfun (&objfile
-> psymbol_obstack
, xmmalloc
);
170 obstack_freefun (&objfile
-> psymbol_obstack
, mfree
);
171 obstack_chunkfun (&objfile
-> symbol_obstack
, xmmalloc
);
172 obstack_freefun (&objfile
-> symbol_obstack
, mfree
);
173 obstack_chunkfun (&objfile
-> type_obstack
, xmmalloc
);
174 obstack_freefun (&objfile
-> type_obstack
, mfree
);
175 /* If already in objfile list, unlink it. */
176 unlink_objfile (objfile
);
177 /* Forget things specific to a particular gdb, may have changed. */
178 objfile
-> sf
= NULL
;
183 /* Set up to detect internal memory corruption. MUST be
184 done before the first malloc. See comments in
185 init_malloc() and mmcheck(). */
189 objfile
= (struct objfile
*)
190 xmmalloc (md
, sizeof (struct objfile
));
191 memset (objfile
, 0, sizeof (struct objfile
));
193 objfile
-> mmfd
= fd
;
194 objfile
-> flags
|= OBJF_MAPPED
;
195 mmalloc_setkey (objfile
-> md
, 0, objfile
);
196 obstack_specify_allocation_with_arg (&objfile
-> psymbol_cache
.cache
,
197 0, 0, xmmalloc
, mfree
,
199 obstack_specify_allocation_with_arg (&objfile
-> psymbol_obstack
,
200 0, 0, xmmalloc
, mfree
,
202 obstack_specify_allocation_with_arg (&objfile
-> symbol_obstack
,
203 0, 0, xmmalloc
, mfree
,
205 obstack_specify_allocation_with_arg (&objfile
-> type_obstack
,
206 0, 0, xmmalloc
, mfree
,
211 if (mapped
&& (objfile
== NULL
))
213 warning ("symbol table for '%s' will not be mapped",
214 bfd_get_filename (abfd
));
217 #else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
221 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
223 /* Turn off the global flag so we don't try to do mapped symbol tables
224 any more, which shuts up gdb unless the user specifically gives the
225 "mapped" keyword again. */
227 mapped_symbol_files
= 0;
230 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
232 /* If we don't support mapped symbol files, didn't ask for the file to be
233 mapped, or failed to open the mapped file for some reason, then revert
234 back to an unmapped objfile. */
238 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
239 memset (objfile
, 0, sizeof (struct objfile
));
240 objfile
-> md
= NULL
;
241 obstack_specify_allocation (&objfile
-> psymbol_cache
.cache
, 0, 0,
243 obstack_specify_allocation (&objfile
-> psymbol_obstack
, 0, 0, xmalloc
,
245 obstack_specify_allocation (&objfile
-> symbol_obstack
, 0, 0, xmalloc
,
247 obstack_specify_allocation (&objfile
-> type_obstack
, 0, 0, xmalloc
,
251 /* Update the per-objfile information that comes from the bfd, ensuring
252 that any data that is reference is saved in the per-objfile data
255 objfile
-> obfd
= abfd
;
256 if (objfile
-> name
!= NULL
)
258 mfree (objfile
-> md
, objfile
-> name
);
260 objfile
-> name
= mstrsave (objfile
-> md
, bfd_get_filename (abfd
));
261 objfile
-> mtime
= bfd_get_mtime (abfd
);
263 /* Build section table. */
265 if (build_objfile_section_table (objfile
))
267 error ("Can't find the file sections in `%s': %s",
268 objfile
-> name
, bfd_errmsg (bfd_get_error ()));
271 /* Add this file onto the tail of the linked list of other such files. */
273 objfile
-> next
= NULL
;
274 if (object_files
== NULL
)
275 object_files
= objfile
;
278 for (last_one
= object_files
;
280 last_one
= last_one
-> next
);
281 last_one
-> next
= objfile
;
286 /* Put OBJFILE at the front of the list. */
289 objfile_to_front (objfile
)
290 struct objfile
*objfile
;
292 struct objfile
**objp
;
293 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
295 if (*objp
== objfile
)
297 /* Unhook it from where it is. */
298 *objp
= objfile
->next
;
299 /* Put it in the front. */
300 objfile
->next
= object_files
;
301 object_files
= objfile
;
307 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
310 It is not a bug, or error, to call this function if OBJFILE is not known
311 to be in the current list. This is done in the case of mapped objfiles,
312 for example, just to ensure that the mapped objfile doesn't appear twice
313 in the list. Since the list is threaded, linking in a mapped objfile
314 twice would create a circular list.
316 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
317 unlinking it, just to ensure that we have completely severed any linkages
318 between the OBJFILE and the list. */
321 unlink_objfile (objfile
)
322 struct objfile
*objfile
;
324 struct objfile
** objpp
;
326 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
) -> next
))
328 if (*objpp
== objfile
)
330 *objpp
= (*objpp
) -> next
;
331 objfile
-> next
= NULL
;
338 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
339 that as much as possible is allocated on the symbol_obstack and
340 psymbol_obstack, so that the memory can be efficiently freed.
342 Things which we do NOT free because they are not in malloc'd memory
343 or not in memory specific to the objfile include:
347 FIXME: If the objfile is using reusable symbol information (via mmalloc),
348 then we need to take into account the fact that more than one process
349 may be using the symbol information at the same time (when mmalloc is
350 extended to support cooperative locking). When more than one process
351 is using the mapped symbol info, we need to be more careful about when
352 we free objects in the reusable area. */
355 free_objfile (objfile
)
356 struct objfile
*objfile
;
358 /* First do any symbol file specific actions required when we are
359 finished with a particular symbol file. Note that if the objfile
360 is using reusable symbol information (via mmalloc) then each of
361 these routines is responsible for doing the correct thing, either
362 freeing things which are valid only during this particular gdb
363 execution, or leaving them to be reused during the next one. */
365 if (objfile
-> sf
!= NULL
)
367 (*objfile
-> sf
-> sym_finish
) (objfile
);
370 /* We always close the bfd. */
372 if (objfile
-> obfd
!= NULL
)
374 char *name
= bfd_get_filename (objfile
->obfd
);
375 if (!bfd_close (objfile
-> obfd
))
376 warning ("cannot close \"%s\": %s",
377 name
, bfd_errmsg (bfd_get_error ()));
381 /* Remove it from the chain of all objfiles. */
383 unlink_objfile (objfile
);
385 /* If we are going to free the runtime common objfile, mark it
388 if (objfile
== rt_common_objfile
)
389 rt_common_objfile
= NULL
;
391 /* Before the symbol table code was redone to make it easier to
392 selectively load and remove information particular to a specific
393 linkage unit, gdb used to do these things whenever the monolithic
394 symbol table was blown away. How much still needs to be done
395 is unknown, but we play it safe for now and keep each action until
396 it is shown to be no longer needed. */
398 #if defined (CLEAR_SOLIB)
400 /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
401 the to_sections for a core file might refer to those bfd's. So
402 detach any core file. */
404 struct target_ops
*t
= find_core_target ();
406 (t
->to_detach
) (NULL
, 0);
409 /* I *think* all our callers call clear_symtab_users. If so, no need
410 to call this here. */
411 clear_pc_function_cache ();
413 /* The last thing we do is free the objfile struct itself for the
414 non-reusable case, or detach from the mapped file for the reusable
415 case. Note that the mmalloc_detach or the mfree is the last thing
416 we can do with this objfile. */
418 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
420 if (objfile
-> flags
& OBJF_MAPPED
)
422 /* Remember the fd so we can close it. We can't close it before
423 doing the detach, and after the detach the objfile is gone. */
426 mmfd
= objfile
-> mmfd
;
427 mmalloc_detach (objfile
-> md
);
432 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
434 /* If we still have an objfile, then either we don't support reusable
435 objfiles or this one was not reusable. So free it normally. */
439 if (objfile
-> name
!= NULL
)
441 mfree (objfile
-> md
, objfile
-> name
);
443 if (objfile
->global_psymbols
.list
)
444 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
445 if (objfile
->static_psymbols
.list
)
446 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
447 /* Free the obstacks for non-reusable objfiles */
448 obstack_free (&objfile
-> psymbol_cache
.cache
, 0);
449 obstack_free (&objfile
-> psymbol_obstack
, 0);
450 obstack_free (&objfile
-> symbol_obstack
, 0);
451 obstack_free (&objfile
-> type_obstack
, 0);
452 mfree (objfile
-> md
, objfile
);
458 /* Free all the object files at once and clean up their users. */
463 struct objfile
*objfile
, *temp
;
465 ALL_OBJFILES_SAFE (objfile
, temp
)
467 free_objfile (objfile
);
469 clear_symtab_users ();
472 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
473 entries in new_offsets. */
475 objfile_relocate (objfile
, new_offsets
)
476 struct objfile
*objfile
;
477 struct section_offsets
*new_offsets
;
479 struct section_offsets
*delta
= (struct section_offsets
*) alloca
480 (sizeof (struct section_offsets
)
481 + objfile
->num_sections
* sizeof (delta
->offsets
));
485 int something_changed
= 0;
486 for (i
= 0; i
< objfile
->num_sections
; ++i
)
488 ANOFFSET (delta
, i
) =
489 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
490 if (ANOFFSET (delta
, i
) != 0)
491 something_changed
= 1;
493 if (!something_changed
)
497 /* OK, get all the symtabs. */
501 ALL_OBJFILE_SYMTABS (objfile
, s
)
504 struct blockvector
*bv
;
507 /* First the line table. */
511 for (i
= 0; i
< l
->nitems
; ++i
)
512 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
515 /* Don't relocate a shared blockvector more than once. */
519 bv
= BLOCKVECTOR (s
);
520 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
525 b
= BLOCKVECTOR_BLOCK (bv
, i
);
526 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
527 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
529 for (j
= 0; j
< BLOCK_NSYMS (b
); ++j
)
531 struct symbol
*sym
= BLOCK_SYM (b
, j
);
532 /* The RS6000 code from which this was taken skipped
533 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
534 But I'm leaving out that test, on the theory that
535 they can't possibly pass the tests below. */
536 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
537 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
538 && SYMBOL_SECTION (sym
) >= 0)
540 SYMBOL_VALUE_ADDRESS (sym
) +=
541 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
543 #ifdef MIPS_EFI_SYMBOL_NAME
544 /* Relocate Extra Function Info for ecoff. */
547 if (SYMBOL_CLASS (sym
) == LOC_CONST
548 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
549 && STRCMP (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
550 ecoff_relocate_efi (sym
, ANOFFSET (delta
, s
->block_line_section
));
558 struct partial_symtab
*p
;
560 ALL_OBJFILE_PSYMTABS (objfile
, p
)
562 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
563 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
568 struct partial_symbol
**psym
;
570 for (psym
= objfile
->global_psymbols
.list
;
571 psym
< objfile
->global_psymbols
.next
;
573 if (SYMBOL_SECTION (*psym
) >= 0)
574 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
, SYMBOL_SECTION (*psym
));
575 for (psym
= objfile
->static_psymbols
.list
;
576 psym
< objfile
->static_psymbols
.next
;
578 if (SYMBOL_SECTION (*psym
) >= 0)
579 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
, 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 or NULL if none found. */
883 struct obj_section
*s
;
884 struct objfile
*objfile
;
886 ALL_OBJFILES (objfile
)
887 for (s
= objfile
->sections
; s
< objfile
->sections_end
; ++s
)
895 /* In SVR4, we recognize a trampoline by it's section name.
896 That is, if the pc is in a section named ".plt" then we are in
900 in_plt_section(pc
, name
)
904 struct obj_section
*s
;
907 s
= find_pc_section(pc
);
910 && s
->the_bfd_section
->name
!= NULL
911 && STREQ (s
->the_bfd_section
->name
, ".plt"));