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_address
PARAMS ((void));
51 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
53 /* Externally visible variables that are owned by this module.
54 See declarations in objfile.h for more info. */
56 struct objfile
*object_files
; /* Linked list of all objfiles */
57 struct objfile
*current_objfile
; /* For symbol file being read in */
58 struct objfile
*symfile_objfile
; /* Main symbol table loaded from */
59 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
61 int mapped_symbol_files
; /* Try to use mapped symbol files */
63 /* Locate all mappable sections of a BFD file.
64 objfile_p_char is a char * to get it through
65 bfd_map_over_sections; we cast it back to its proper type. */
68 add_to_objfile_sections (abfd
, asect
, objfile_p_char
)
73 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
74 struct obj_section section
;
77 aflag
= bfd_get_section_flags (abfd
, asect
);
78 if (!(aflag
& SEC_ALLOC
))
80 if (0 == bfd_section_size (abfd
, asect
))
83 section
.objfile
= objfile
;
84 section
.the_bfd_section
= asect
;
85 section
.addr
= bfd_section_vma (abfd
, asect
);
86 section
.endaddr
= section
.addr
+ bfd_section_size (abfd
, asect
);
87 obstack_grow (&objfile
->psymbol_obstack
, (char *) §ion
, sizeof(section
));
88 objfile
->sections_end
= (struct obj_section
*) (((unsigned long) objfile
->sections_end
) + 1);
91 /* Builds a section table for OBJFILE.
92 Returns 0 if OK, 1 on error (in which case bfd_error contains the
96 build_objfile_section_table (objfile
)
97 struct objfile
*objfile
;
99 /* objfile->sections can be already set when reading a mapped symbol
100 file. I believe that we do need to rebuild the section table in
101 this case (we rebuild other things derived from the bfd), but we
102 can't free the old one (it's in the psymbol_obstack). So we just
103 waste some memory. */
105 objfile
->sections_end
= 0;
106 bfd_map_over_sections (objfile
->obfd
, add_to_objfile_sections
, (char *)objfile
);
107 objfile
->sections
= (struct obj_section
*)
108 obstack_finish (&objfile
->psymbol_obstack
);
109 objfile
->sections_end
= objfile
->sections
+ (unsigned long) objfile
->sections_end
;
113 /* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
114 whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
115 struct, fill it in as best we can, link it into the list of all known
116 objfiles, and return a pointer to the new objfile struct. */
119 allocate_objfile (abfd
, mapped
)
123 struct objfile
*objfile
= NULL
;
124 struct objfile
*last_one
= NULL
;
126 mapped
|= mapped_symbol_files
;
128 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
131 /* If we can support mapped symbol files, try to open/reopen the
132 mapped file that corresponds to the file from which we wish to
133 read symbols. If the objfile is to be mapped, we must malloc
134 the structure itself using the mmap version, and arrange that
135 all memory allocation for the objfile uses the mmap routines.
136 If we are reusing an existing mapped file, from which we get
137 our objfile pointer, we have to make sure that we update the
138 pointers to the alloc/free functions in the obstack, in case
139 these functions have moved within the current gdb. */
143 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
150 if (((mapto
= map_to_address ()) == 0) ||
151 ((md
= mmalloc_attach (fd
, (PTR
) mapto
)) == NULL
))
155 else if ((objfile
= (struct objfile
*) mmalloc_getkey (md
, 0)) != NULL
)
157 /* Update memory corruption handler function addresses. */
160 objfile
-> mmfd
= fd
;
161 /* Update pointers to functions to *our* copies */
162 obstack_chunkfun (&objfile
-> psymbol_cache
.cache
, xmmalloc
);
163 obstack_freefun (&objfile
-> psymbol_cache
.cache
, mfree
);
164 obstack_chunkfun (&objfile
-> psymbol_obstack
, xmmalloc
);
165 obstack_freefun (&objfile
-> psymbol_obstack
, mfree
);
166 obstack_chunkfun (&objfile
-> symbol_obstack
, xmmalloc
);
167 obstack_freefun (&objfile
-> symbol_obstack
, mfree
);
168 obstack_chunkfun (&objfile
-> type_obstack
, xmmalloc
);
169 obstack_freefun (&objfile
-> type_obstack
, mfree
);
170 /* If already in objfile list, unlink it. */
171 unlink_objfile (objfile
);
172 /* Forget things specific to a particular gdb, may have changed. */
173 objfile
-> sf
= NULL
;
178 /* Set up to detect internal memory corruption. MUST be
179 done before the first malloc. See comments in
180 init_malloc() and mmcheck(). */
184 objfile
= (struct objfile
*)
185 xmmalloc (md
, sizeof (struct objfile
));
186 memset (objfile
, 0, sizeof (struct objfile
));
188 objfile
-> mmfd
= fd
;
189 objfile
-> flags
|= OBJF_MAPPED
;
190 mmalloc_setkey (objfile
-> md
, 0, objfile
);
191 obstack_specify_allocation_with_arg (&objfile
-> psymbol_cache
.cache
,
192 0, 0, xmmalloc
, mfree
,
194 obstack_specify_allocation_with_arg (&objfile
-> psymbol_obstack
,
195 0, 0, xmmalloc
, mfree
,
197 obstack_specify_allocation_with_arg (&objfile
-> symbol_obstack
,
198 0, 0, xmmalloc
, mfree
,
200 obstack_specify_allocation_with_arg (&objfile
-> type_obstack
,
201 0, 0, xmmalloc
, mfree
,
206 if (mapped
&& (objfile
== NULL
))
208 warning ("symbol table for '%s' will not be mapped",
209 bfd_get_filename (abfd
));
212 #else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
216 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
218 /* Turn off the global flag so we don't try to do mapped symbol tables
219 any more, which shuts up gdb unless the user specifically gives the
220 "mapped" keyword again. */
222 mapped_symbol_files
= 0;
225 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
227 /* If we don't support mapped symbol files, didn't ask for the file to be
228 mapped, or failed to open the mapped file for some reason, then revert
229 back to an unmapped objfile. */
233 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
234 memset (objfile
, 0, sizeof (struct objfile
));
235 objfile
-> md
= NULL
;
236 obstack_specify_allocation (&objfile
-> psymbol_cache
.cache
, 0, 0,
238 obstack_specify_allocation (&objfile
-> psymbol_obstack
, 0, 0, xmalloc
,
240 obstack_specify_allocation (&objfile
-> symbol_obstack
, 0, 0, xmalloc
,
242 obstack_specify_allocation (&objfile
-> type_obstack
, 0, 0, xmalloc
,
246 /* Update the per-objfile information that comes from the bfd, ensuring
247 that any data that is reference is saved in the per-objfile data
250 objfile
-> obfd
= abfd
;
251 if (objfile
-> name
!= NULL
)
253 mfree (objfile
-> md
, objfile
-> name
);
255 objfile
-> name
= mstrsave (objfile
-> md
, bfd_get_filename (abfd
));
256 objfile
-> mtime
= bfd_get_mtime (abfd
);
258 /* Build section table. */
260 if (build_objfile_section_table (objfile
))
262 error ("Can't find the file sections in `%s': %s",
263 objfile
-> name
, bfd_errmsg (bfd_get_error ()));
266 /* Add this file onto the tail of the linked list of other such files. */
268 objfile
-> next
= NULL
;
269 if (object_files
== NULL
)
270 object_files
= objfile
;
273 for (last_one
= object_files
;
275 last_one
= last_one
-> next
);
276 last_one
-> next
= objfile
;
281 /* Put OBJFILE at the front of the list. */
284 objfile_to_front (objfile
)
285 struct objfile
*objfile
;
287 struct objfile
**objp
;
288 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
290 if (*objp
== objfile
)
292 /* Unhook it from where it is. */
293 *objp
= objfile
->next
;
294 /* Put it in the front. */
295 objfile
->next
= object_files
;
296 object_files
= objfile
;
302 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
305 It is not a bug, or error, to call this function if OBJFILE is not known
306 to be in the current list. This is done in the case of mapped objfiles,
307 for example, just to ensure that the mapped objfile doesn't appear twice
308 in the list. Since the list is threaded, linking in a mapped objfile
309 twice would create a circular list.
311 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
312 unlinking it, just to ensure that we have completely severed any linkages
313 between the OBJFILE and the list. */
316 unlink_objfile (objfile
)
317 struct objfile
*objfile
;
319 struct objfile
** objpp
;
321 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
) -> next
))
323 if (*objpp
== objfile
)
325 *objpp
= (*objpp
) -> next
;
326 objfile
-> next
= NULL
;
333 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
334 that as much as possible is allocated on the symbol_obstack and
335 psymbol_obstack, so that the memory can be efficiently freed.
337 Things which we do NOT free because they are not in malloc'd memory
338 or not in memory specific to the objfile include:
342 FIXME: If the objfile is using reusable symbol information (via mmalloc),
343 then we need to take into account the fact that more than one process
344 may be using the symbol information at the same time (when mmalloc is
345 extended to support cooperative locking). When more than one process
346 is using the mapped symbol info, we need to be more careful about when
347 we free objects in the reusable area. */
350 free_objfile (objfile
)
351 struct objfile
*objfile
;
353 /* First do any symbol file specific actions required when we are
354 finished with a particular symbol file. Note that if the objfile
355 is using reusable symbol information (via mmalloc) then each of
356 these routines is responsible for doing the correct thing, either
357 freeing things which are valid only during this particular gdb
358 execution, or leaving them to be reused during the next one. */
360 if (objfile
-> sf
!= NULL
)
362 (*objfile
-> sf
-> sym_finish
) (objfile
);
365 /* We always close the bfd. */
367 if (objfile
-> obfd
!= NULL
)
369 char *name
= bfd_get_filename (objfile
->obfd
);
370 if (!bfd_close (objfile
-> obfd
))
371 warning ("cannot close \"%s\": %s",
372 name
, bfd_errmsg (bfd_get_error ()));
376 /* Remove it from the chain of all objfiles. */
378 unlink_objfile (objfile
);
380 /* If we are going to free the runtime common objfile, mark it
383 if (objfile
== rt_common_objfile
)
384 rt_common_objfile
= NULL
;
386 /* Before the symbol table code was redone to make it easier to
387 selectively load and remove information particular to a specific
388 linkage unit, gdb used to do these things whenever the monolithic
389 symbol table was blown away. How much still needs to be done
390 is unknown, but we play it safe for now and keep each action until
391 it is shown to be no longer needed. */
393 #if defined (CLEAR_SOLIB)
395 /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
396 the to_sections for a core file might refer to those bfd's. So
397 detach any core file. */
399 struct target_ops
*t
= find_core_target ();
401 (t
->to_detach
) (NULL
, 0);
404 /* I *think* all our callers call clear_symtab_users. If so, no need
405 to call this here. */
406 clear_pc_function_cache ();
408 /* The last thing we do is free the objfile struct itself for the
409 non-reusable case, or detach from the mapped file for the reusable
410 case. Note that the mmalloc_detach or the mfree is the last thing
411 we can do with this objfile. */
413 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
415 if (objfile
-> flags
& OBJF_MAPPED
)
417 /* Remember the fd so we can close it. We can't close it before
418 doing the detach, and after the detach the objfile is gone. */
421 mmfd
= objfile
-> mmfd
;
422 mmalloc_detach (objfile
-> md
);
427 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
429 /* If we still have an objfile, then either we don't support reusable
430 objfiles or this one was not reusable. So free it normally. */
434 if (objfile
-> name
!= NULL
)
436 mfree (objfile
-> md
, objfile
-> name
);
438 if (objfile
->global_psymbols
.list
)
439 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
440 if (objfile
->static_psymbols
.list
)
441 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
442 /* Free the obstacks for non-reusable objfiles */
443 obstack_free (&objfile
-> psymbol_cache
.cache
, 0);
444 obstack_free (&objfile
-> psymbol_obstack
, 0);
445 obstack_free (&objfile
-> symbol_obstack
, 0);
446 obstack_free (&objfile
-> type_obstack
, 0);
447 mfree (objfile
-> md
, objfile
);
453 /* Free all the object files at once and clean up their users. */
458 struct objfile
*objfile
, *temp
;
460 ALL_OBJFILES_SAFE (objfile
, temp
)
462 free_objfile (objfile
);
464 clear_symtab_users ();
467 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
468 entries in new_offsets. */
470 objfile_relocate (objfile
, new_offsets
)
471 struct objfile
*objfile
;
472 struct section_offsets
*new_offsets
;
474 struct section_offsets
*delta
= (struct section_offsets
*) alloca
475 (sizeof (struct section_offsets
)
476 + objfile
->num_sections
* sizeof (delta
->offsets
));
480 int something_changed
= 0;
481 for (i
= 0; i
< objfile
->num_sections
; ++i
)
483 ANOFFSET (delta
, i
) =
484 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
485 if (ANOFFSET (delta
, i
) != 0)
486 something_changed
= 1;
488 if (!something_changed
)
492 /* OK, get all the symtabs. */
496 ALL_OBJFILE_SYMTABS (objfile
, s
)
499 struct blockvector
*bv
;
502 /* First the line table. */
506 for (i
= 0; i
< l
->nitems
; ++i
)
507 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
510 /* Don't relocate a shared blockvector more than once. */
514 bv
= BLOCKVECTOR (s
);
515 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
520 b
= BLOCKVECTOR_BLOCK (bv
, i
);
521 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
522 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
524 for (j
= 0; j
< BLOCK_NSYMS (b
); ++j
)
526 struct symbol
*sym
= BLOCK_SYM (b
, j
);
527 /* The RS6000 code from which this was taken skipped
528 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
529 But I'm leaving out that test, on the theory that
530 they can't possibly pass the tests below. */
531 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
532 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
533 && SYMBOL_SECTION (sym
) >= 0)
535 SYMBOL_VALUE_ADDRESS (sym
) +=
536 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
538 #ifdef MIPS_EFI_SYMBOL_NAME
539 /* Relocate Extra Function Info for ecoff. */
542 if (SYMBOL_CLASS (sym
) == LOC_CONST
543 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
544 && STRCMP (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
545 ecoff_relocate_efi (sym
, ANOFFSET (delta
, s
->block_line_section
));
553 struct partial_symtab
*p
;
555 ALL_OBJFILE_PSYMTABS (objfile
, p
)
557 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
558 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
563 struct partial_symbol
**psym
;
565 for (psym
= objfile
->global_psymbols
.list
;
566 psym
< objfile
->global_psymbols
.next
;
568 if (SYMBOL_SECTION (*psym
) >= 0)
569 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
, SYMBOL_SECTION (*psym
));
570 for (psym
= objfile
->static_psymbols
.list
;
571 psym
< objfile
->static_psymbols
.next
;
573 if (SYMBOL_SECTION (*psym
) >= 0)
574 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
, SYMBOL_SECTION (*psym
));
578 struct minimal_symbol
*msym
;
579 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
580 if (SYMBOL_SECTION (msym
) >= 0)
581 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
583 /* Relocating different sections by different amounts may cause the symbols
584 to be out of order. */
585 msymbols_sort (objfile
);
589 for (i
= 0; i
< objfile
->num_sections
; ++i
)
590 ANOFFSET (objfile
->section_offsets
, i
) = ANOFFSET (new_offsets
, i
);
594 struct obj_section
*s
;
597 abfd
= objfile
->obfd
;
599 for (s
= objfile
->sections
;
600 s
< objfile
->sections_end
; ++s
)
604 flags
= bfd_get_section_flags (abfd
, s
->the_bfd_section
);
606 if (flags
& SEC_CODE
)
608 s
->addr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
609 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
611 else if (flags
& (SEC_DATA
| SEC_LOAD
))
613 s
->addr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
614 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
616 else if (flags
& SEC_ALLOC
)
618 s
->addr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
619 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
624 if (objfile
->ei
.entry_point
!= ~0)
625 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
627 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
629 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
630 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
633 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
635 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
636 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
639 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
641 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
642 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
646 /* Many places in gdb want to test just to see if we have any partial
647 symbols available. This function returns zero if none are currently
648 available, nonzero otherwise. */
651 have_partial_symbols ()
657 if (ofp
-> psymtabs
!= NULL
)
665 /* Many places in gdb want to test just to see if we have any full
666 symbols available. This function returns zero if none are currently
667 available, nonzero otherwise. */
676 if (ofp
-> symtabs
!= NULL
)
684 /* Many places in gdb want to test just to see if we have any minimal
685 symbols available. This function returns zero if none are currently
686 available, nonzero otherwise. */
689 have_minimal_symbols ()
695 if (ofp
-> msymbols
!= NULL
)
703 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
705 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
706 of the corresponding symbol file in MTIME, try to open an existing file
707 with the name SYMSFILENAME and verify it is more recent than the base
708 file by checking it's timestamp against MTIME.
710 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
712 If SYMSFILENAME does exist, but is out of date, we check to see if the
713 user has specified creation of a mapped file. If so, we don't issue
714 any warning message because we will be creating a new mapped file anyway,
715 overwriting the old one. If not, then we issue a warning message so that
716 the user will know why we aren't using this existing mapped symbol file.
717 In either case, we return -1.
719 If SYMSFILENAME does exist and is not out of date, but can't be opened for
720 some reason, then prints an appropriate system error message and returns -1.
722 Otherwise, returns the open file descriptor. */
725 open_existing_mapped_file (symsfilename
, mtime
, mapped
)
733 if (stat (symsfilename
, &sbuf
) == 0)
735 if (sbuf
.st_mtime
< mtime
)
739 warning ("mapped symbol file `%s' is out of date, ignored it",
743 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
747 printf_unfiltered (error_pre_print
);
749 print_sys_errmsg (symsfilename
, errno
);
755 /* Look for a mapped symbol file that corresponds to FILENAME and is more
756 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
757 use a mapped symbol file for this file, so create a new one if one does
760 If found, then return an open file descriptor for the file, otherwise
763 This routine is responsible for implementing the policy that generates
764 the name of the mapped symbol file from the name of a file containing
765 symbols that gdb would like to read. Currently this policy is to append
766 ".syms" to the name of the file.
768 This routine is also responsible for implementing the policy that
769 determines where the mapped symbol file is found (the search path).
770 This policy is that when reading an existing mapped file, a file of
771 the correct name in the current directory takes precedence over a
772 file of the correct name in the same directory as the symbol file.
773 When creating a new mapped file, it is always created in the current
774 directory. This helps to minimize the chances of a user unknowingly
775 creating big mapped files in places like /bin and /usr/local/bin, and
776 allows a local copy to override a manually installed global copy (in
777 /bin for example). */
780 open_mapped_file (filename
, mtime
, mapped
)
788 /* First try to open an existing file in the current directory, and
789 then try the directory where the symbol file is located. */
791 symsfilename
= concat ("./", basename (filename
), ".syms", (char *) NULL
);
792 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
)) < 0)
795 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
796 fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
);
799 /* If we don't have an open file by now, then either the file does not
800 already exist, or the base file has changed since it was created. In
801 either case, if the user has specified use of a mapped file, then
802 create a new mapped file, truncating any existing one. If we can't
803 create one, print a system error message saying why we can't.
805 By default the file is rw for everyone, with the user's umask taking
806 care of turning off the permissions the user wants off. */
808 if ((fd
< 0) && mapped
)
811 symsfilename
= concat ("./", basename (filename
), ".syms",
813 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
817 printf_unfiltered (error_pre_print
);
819 print_sys_errmsg (symsfilename
, errno
);
827 /* Return the base address at which we would like the next objfile's
828 mapped data to start.
830 For now, we use the kludge that the configuration specifies a base
831 address to which it is safe to map the first mmalloc heap, and an
832 increment to add to this address for each successive heap. There are
833 a lot of issues to deal with here to make this work reasonably, including:
835 Avoid memory collisions with existing mapped address spaces
837 Reclaim address spaces when their mmalloc heaps are unmapped
839 When mmalloc heaps are shared between processes they have to be
840 mapped at the same addresses in each
842 Once created, a mmalloc heap that is to be mapped back in must be
843 mapped at the original address. I.E. each objfile will expect to
844 be remapped at it's original address. This becomes a problem if
845 the desired address is already in use.
856 #if defined(MMAP_BASE_ADDRESS) && defined (MMAP_INCREMENT)
858 static CORE_ADDR next
= MMAP_BASE_ADDRESS
;
859 CORE_ADDR mapto
= next
;
861 next
+= MMAP_INCREMENT
;
866 warning ("need to recompile gdb with MMAP_BASE_ADDRESS and MMAP_INCREMENT defined");
873 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
875 /* Returns a section whose range includes PC or NULL if none found. */
881 struct obj_section
*s
;
882 struct objfile
*objfile
;
884 ALL_OBJFILES (objfile
)
885 for (s
= objfile
->sections
; s
< objfile
->sections_end
; ++s
)
893 /* In SVR4, we recognize a trampoline by it's section name.
894 That is, if the pc is in a section named ".plt" then we are in
898 in_plt_section(pc
, name
)
902 struct obj_section
*s
;
905 s
= find_pc_section(pc
);
908 && s
->the_bfd_section
->name
!= NULL
909 && STREQ (s
->the_bfd_section
->name
, ".plt"));