1 /* GDB routines for manipulating objfiles.
2 Copyright 1992 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., 675 Mass Ave, Cambridge, MA 02139, 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>
37 /* Prototypes for local functions */
39 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
42 open_existing_mapped_file
PARAMS ((char *, long, int));
45 open_mapped_file
PARAMS ((char *filename
, long mtime
, int mapped
));
48 map_to_address
PARAMS ((void));
50 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
52 /* Message to be printed before the error message, when an error occurs. */
54 extern char *error_pre_print
;
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 */
63 int mapped_symbol_files
; /* Try to use mapped symbol files */
65 /* Locate all mappable sections of a BFD file.
66 objfile_p_char is a char * to get it through
67 bfd_map_over_sections; we cast it back to its proper type. */
70 add_to_objfile_sections (abfd
, asect
, objfile_p_char
)
75 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
76 struct obj_section section
;
79 aflag
= bfd_get_section_flags (abfd
, asect
);
80 if (!(aflag
& SEC_ALLOC
))
82 if (0 == bfd_section_size (abfd
, asect
))
85 section
.objfile
= objfile
;
86 section
.the_bfd_section
= asect
;
87 section
.addr
= bfd_section_vma (abfd
, asect
);
88 section
.endaddr
= section
.addr
+ bfd_section_size (abfd
, asect
);
89 obstack_grow (&objfile
->psymbol_obstack
, §ion
, sizeof(section
));
90 objfile
->sections_end
= (struct obj_section
*) (((unsigned long) objfile
->sections_end
) + 1);
93 /* Builds a section table for OBJFILE.
94 Returns 0 if OK, 1 on error (in which case bfd_error contains the
98 build_objfile_section_table (objfile
)
99 struct objfile
*objfile
;
101 /* objfile->sections can be already set when reading a mapped symbol
102 file. I believe that we do need to rebuild the section table in
103 this case (we rebuild other things derived from the bfd), but we
104 can't free the old one (it's in the psymbol_obstack). So we just
105 waste some memory. */
107 objfile
->sections_end
= 0;
108 bfd_map_over_sections (objfile
->obfd
, add_to_objfile_sections
, (char *)objfile
);
109 objfile
->sections
= (struct obj_section
*)
110 obstack_finish (&objfile
->psymbol_obstack
);
111 objfile
->sections_end
= objfile
->sections
+ (unsigned long) objfile
->sections_end
;
115 /* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
116 whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
117 struct, fill it in as best we can, link it into the list of all known
118 objfiles, and return a pointer to the new objfile struct. */
121 allocate_objfile (abfd
, mapped
)
125 struct objfile
*objfile
= NULL
;
126 struct objfile
*last_one
= NULL
;
128 mapped
|= mapped_symbol_files
;
130 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
133 /* If we can support mapped symbol files, try to open/reopen the
134 mapped file that corresponds to the file from which we wish to
135 read symbols. If the objfile is to be mapped, we must malloc
136 the structure itself using the mmap version, and arrange that
137 all memory allocation for the objfile uses the mmap routines.
138 If we are reusing an existing mapped file, from which we get
139 our objfile pointer, we have to make sure that we update the
140 pointers to the alloc/free functions in the obstack, in case
141 these functions have moved within the current gdb. */
145 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
152 if (((mapto
= map_to_address ()) == 0) ||
153 ((md
= mmalloc_attach (fd
, (PTR
) mapto
)) == 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_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_obstack
,
192 0, 0, xmmalloc
, mfree
,
194 obstack_specify_allocation_with_arg (&objfile
-> symbol_obstack
,
195 0, 0, xmmalloc
, mfree
,
197 obstack_specify_allocation_with_arg (&objfile
-> type_obstack
,
198 0, 0, xmmalloc
, mfree
,
203 if (mapped
&& (objfile
== NULL
))
205 warning ("symbol table for '%s' will not be mapped",
206 bfd_get_filename (abfd
));
209 #else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
213 warning ("this version of gdb does not support mapped symbol tables.");
215 /* Turn off the global flag so we don't try to do mapped symbol tables
216 any more, which shuts up gdb unless the user specifically gives the
217 "mapped" keyword again. */
219 mapped_symbol_files
= 0;
222 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
224 /* If we don't support mapped symbol files, didn't ask for the file to be
225 mapped, or failed to open the mapped file for some reason, then revert
226 back to an unmapped objfile. */
230 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
231 memset (objfile
, 0, sizeof (struct objfile
));
232 objfile
-> md
= NULL
;
233 obstack_specify_allocation (&objfile
-> psymbol_obstack
, 0, 0, xmalloc
,
235 obstack_specify_allocation (&objfile
-> symbol_obstack
, 0, 0, xmalloc
,
237 obstack_specify_allocation (&objfile
-> type_obstack
, 0, 0, xmalloc
,
241 /* Update the per-objfile information that comes from the bfd, ensuring
242 that any data that is reference is saved in the per-objfile data
245 objfile
-> obfd
= abfd
;
246 if (objfile
-> name
!= NULL
)
248 mfree (objfile
-> md
, objfile
-> name
);
250 objfile
-> name
= mstrsave (objfile
-> md
, bfd_get_filename (abfd
));
251 objfile
-> mtime
= bfd_get_mtime (abfd
);
253 /* Build section table. */
255 if (build_objfile_section_table (objfile
))
257 error ("Can't find the file sections in `%s': %s",
258 objfile
-> name
, bfd_errmsg (bfd_get_error ()));
261 /* Add this file onto the tail of the linked list of other such files. */
263 objfile
-> next
= NULL
;
264 if (object_files
== NULL
)
265 object_files
= objfile
;
268 for (last_one
= object_files
;
270 last_one
= last_one
-> next
);
271 last_one
-> next
= objfile
;
276 /* Put OBJFILE at the front of the list. */
279 objfile_to_front (objfile
)
280 struct objfile
*objfile
;
282 struct objfile
**objp
;
283 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
285 if (*objp
== objfile
)
287 /* Unhook it from where it is. */
288 *objp
= objfile
->next
;
289 /* Put it in the front. */
290 objfile
->next
= object_files
;
291 object_files
= objfile
;
297 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
300 It is not a bug, or error, to call this function if OBJFILE is not known
301 to be in the current list. This is done in the case of mapped objfiles,
302 for example, just to ensure that the mapped objfile doesn't appear twice
303 in the list. Since the list is threaded, linking in a mapped objfile
304 twice would create a circular list.
306 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
307 unlinking it, just to ensure that we have completely severed any linkages
308 between the OBJFILE and the list. */
311 unlink_objfile (objfile
)
312 struct objfile
*objfile
;
314 struct objfile
** objpp
;
316 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
) -> next
))
318 if (*objpp
== objfile
)
320 *objpp
= (*objpp
) -> next
;
321 objfile
-> next
= NULL
;
328 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
329 that as much as possible is allocated on the symbol_obstack and
330 psymbol_obstack, so that the memory can be efficiently freed.
332 Things which we do NOT free because they are not in malloc'd memory
333 or not in memory specific to the objfile include:
337 FIXME: If the objfile is using reusable symbol information (via mmalloc),
338 then we need to take into account the fact that more than one process
339 may be using the symbol information at the same time (when mmalloc is
340 extended to support cooperative locking). When more than one process
341 is using the mapped symbol info, we need to be more careful about when
342 we free objects in the reusable area. */
345 free_objfile (objfile
)
346 struct objfile
*objfile
;
348 /* First do any symbol file specific actions required when we are
349 finished with a particular symbol file. Note that if the objfile
350 is using reusable symbol information (via mmalloc) then each of
351 these routines is responsible for doing the correct thing, either
352 freeing things which are valid only during this particular gdb
353 execution, or leaving them to be reused during the next one. */
355 if (objfile
-> sf
!= NULL
)
357 (*objfile
-> sf
-> sym_finish
) (objfile
);
360 /* We always close the bfd. */
362 if (objfile
-> obfd
!= NULL
)
364 char *name
= bfd_get_filename (objfile
->obfd
);
365 if (!bfd_close (objfile
-> obfd
))
366 warning ("cannot close \"%s\": %s",
367 name
, bfd_errmsg (bfd_get_error ()));
371 /* Remove it from the chain of all objfiles. */
373 unlink_objfile (objfile
);
375 /* Before the symbol table code was redone to make it easier to
376 selectively load and remove information particular to a specific
377 linkage unit, gdb used to do these things whenever the monolithic
378 symbol table was blown away. How much still needs to be done
379 is unknown, but we play it safe for now and keep each action until
380 it is shown to be no longer needed. */
382 #if defined (CLEAR_SOLIB)
384 /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
385 the to_sections for a core file might refer to those bfd's. So
386 detach any core file. */
388 struct target_ops
*t
= find_core_target ();
390 (t
->to_detach
) (NULL
, 0);
393 /* I *think* all our callers call clear_symtab_users. If so, no need
394 to call this here. */
395 clear_pc_function_cache ();
397 /* The last thing we do is free the objfile struct itself for the
398 non-reusable case, or detach from the mapped file for the reusable
399 case. Note that the mmalloc_detach or the mfree is the last thing
400 we can do with this objfile. */
402 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
404 if (objfile
-> flags
& OBJF_MAPPED
)
406 /* Remember the fd so we can close it. We can't close it before
407 doing the detach, and after the detach the objfile is gone. */
410 mmfd
= objfile
-> mmfd
;
411 mmalloc_detach (objfile
-> md
);
416 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
418 /* If we still have an objfile, then either we don't support reusable
419 objfiles or this one was not reusable. So free it normally. */
423 if (objfile
-> name
!= NULL
)
425 mfree (objfile
-> md
, objfile
-> name
);
427 if (objfile
->global_psymbols
.list
)
428 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
429 if (objfile
->static_psymbols
.list
)
430 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
431 /* Free the obstacks for non-reusable objfiles */
432 obstack_free (&objfile
-> psymbol_obstack
, 0);
433 obstack_free (&objfile
-> symbol_obstack
, 0);
434 obstack_free (&objfile
-> type_obstack
, 0);
435 mfree (objfile
-> md
, objfile
);
441 /* Free all the object files at once and clean up their users. */
446 struct objfile
*objfile
, *temp
;
448 ALL_OBJFILES_SAFE (objfile
, temp
)
450 free_objfile (objfile
);
452 clear_symtab_users ();
455 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
456 entries in new_offsets. */
458 objfile_relocate (objfile
, new_offsets
)
459 struct objfile
*objfile
;
460 struct section_offsets
*new_offsets
;
462 struct section_offsets
*delta
= (struct section_offsets
*) alloca
463 (sizeof (struct section_offsets
)
464 + objfile
->num_sections
* sizeof (delta
->offsets
));
468 int something_changed
= 0;
469 for (i
= 0; i
< objfile
->num_sections
; ++i
)
471 ANOFFSET (delta
, i
) =
472 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
473 if (ANOFFSET (delta
, i
) != 0)
474 something_changed
= 1;
476 if (!something_changed
)
480 /* OK, get all the symtabs. */
484 ALL_OBJFILE_SYMTABS (objfile
, s
)
487 struct blockvector
*bv
;
490 /* First the line table. */
494 for (i
= 0; i
< l
->nitems
; ++i
)
495 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
498 /* Don't relocate a shared blockvector more than once. */
502 bv
= BLOCKVECTOR (s
);
503 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
508 b
= BLOCKVECTOR_BLOCK (bv
, i
);
509 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
510 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
512 for (j
= 0; j
< BLOCK_NSYMS (b
); ++j
)
514 struct symbol
*sym
= BLOCK_SYM (b
, j
);
515 /* The RS6000 code from which this was taken skipped
516 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
517 But I'm leaving out that test, on the theory that
518 they can't possibly pass the tests below. */
519 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
520 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
521 && SYMBOL_SECTION (sym
) >= 0)
523 SYMBOL_VALUE_ADDRESS (sym
) +=
524 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
526 #ifdef MIPS_EFI_SYMBOL_NAME
527 /* Relocate Extra Function Info for ecoff. */
530 if (SYMBOL_CLASS (sym
) == LOC_CONST
531 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
532 && STRCMP (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
533 ecoff_relocate_efi (sym
, ANOFFSET (delta
, s
->block_line_section
));
541 struct partial_symtab
*p
;
543 ALL_OBJFILE_PSYMTABS (objfile
, p
)
545 /* FIXME: specific to symbol readers which use gdb-stabs.h.
546 We can only get away with it since objfile_relocate is only
547 used on XCOFF, which lacks psymtabs, and for gdb-stabs.h
549 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
550 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
555 struct partial_symbol
*psym
;
557 for (psym
= objfile
->global_psymbols
.list
;
558 psym
< objfile
->global_psymbols
.next
;
560 if (SYMBOL_SECTION (psym
) >= 0)
561 SYMBOL_VALUE_ADDRESS (psym
) += ANOFFSET (delta
, SYMBOL_SECTION (psym
));
562 for (psym
= objfile
->static_psymbols
.list
;
563 psym
< objfile
->static_psymbols
.next
;
565 if (SYMBOL_SECTION (psym
) >= 0)
566 SYMBOL_VALUE_ADDRESS (psym
) += ANOFFSET (delta
, SYMBOL_SECTION (psym
));
570 struct minimal_symbol
*msym
;
571 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
572 if (SYMBOL_SECTION (msym
) >= 0)
573 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
575 /* Relocating different sections by different amounts may cause the symbols
576 to be out of order. */
577 msymbols_sort (objfile
);
581 for (i
= 0; i
< objfile
->num_sections
; ++i
)
582 ANOFFSET (objfile
->section_offsets
, i
) = ANOFFSET (new_offsets
, i
);
586 struct obj_section
*s
;
589 abfd
= objfile
->obfd
;
591 for (s
= objfile
->sections
;
592 s
< objfile
->sections_end
; ++s
)
596 flags
= bfd_get_section_flags (abfd
, s
->the_bfd_section
);
598 if (flags
& SEC_CODE
)
600 s
->addr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
601 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
603 else if (flags
& (SEC_DATA
| SEC_LOAD
))
605 s
->addr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
606 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
608 else if (flags
& SEC_ALLOC
)
610 s
->addr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
611 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
616 if (objfile
->ei
.entry_point
!= ~0)
617 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
619 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
621 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
622 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
625 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
627 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
628 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
631 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
633 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
634 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
638 /* Many places in gdb want to test just to see if we have any partial
639 symbols available. This function returns zero if none are currently
640 available, nonzero otherwise. */
643 have_partial_symbols ()
649 if (ofp
-> psymtabs
!= NULL
)
657 /* Many places in gdb want to test just to see if we have any full
658 symbols available. This function returns zero if none are currently
659 available, nonzero otherwise. */
668 if (ofp
-> symtabs
!= NULL
)
676 /* Many places in gdb want to test just to see if we have any minimal
677 symbols available. This function returns zero if none are currently
678 available, nonzero otherwise. */
681 have_minimal_symbols ()
687 if (ofp
-> msymbols
!= NULL
)
695 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
697 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
698 of the corresponding symbol file in MTIME, try to open an existing file
699 with the name SYMSFILENAME and verify it is more recent than the base
700 file by checking it's timestamp against MTIME.
702 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
704 If SYMSFILENAME does exist, but is out of date, we check to see if the
705 user has specified creation of a mapped file. If so, we don't issue
706 any warning message because we will be creating a new mapped file anyway,
707 overwriting the old one. If not, then we issue a warning message so that
708 the user will know why we aren't using this existing mapped symbol file.
709 In either case, we return -1.
711 If SYMSFILENAME does exist and is not out of date, but can't be opened for
712 some reason, then prints an appropriate system error message and returns -1.
714 Otherwise, returns the open file descriptor. */
717 open_existing_mapped_file (symsfilename
, mtime
, mapped
)
725 if (stat (symsfilename
, &sbuf
) == 0)
727 if (sbuf
.st_mtime
< mtime
)
731 warning ("mapped symbol file `%s' is out of date, ignored it",
735 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
739 printf_unfiltered (error_pre_print
);
741 print_sys_errmsg (symsfilename
, errno
);
747 /* Look for a mapped symbol file that corresponds to FILENAME and is more
748 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
749 use a mapped symbol file for this file, so create a new one if one does
752 If found, then return an open file descriptor for the file, otherwise
755 This routine is responsible for implementing the policy that generates
756 the name of the mapped symbol file from the name of a file containing
757 symbols that gdb would like to read. Currently this policy is to append
758 ".syms" to the name of the file.
760 This routine is also responsible for implementing the policy that
761 determines where the mapped symbol file is found (the search path).
762 This policy is that when reading an existing mapped file, a file of
763 the correct name in the current directory takes precedence over a
764 file of the correct name in the same directory as the symbol file.
765 When creating a new mapped file, it is always created in the current
766 directory. This helps to minimize the chances of a user unknowingly
767 creating big mapped files in places like /bin and /usr/local/bin, and
768 allows a local copy to override a manually installed global copy (in
769 /bin for example). */
772 open_mapped_file (filename
, mtime
, mapped
)
780 /* First try to open an existing file in the current directory, and
781 then try the directory where the symbol file is located. */
783 symsfilename
= concat ("./", basename (filename
), ".syms", (char *) NULL
);
784 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
)) < 0)
787 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
788 fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
);
791 /* If we don't have an open file by now, then either the file does not
792 already exist, or the base file has changed since it was created. In
793 either case, if the user has specified use of a mapped file, then
794 create a new mapped file, truncating any existing one. If we can't
795 create one, print a system error message saying why we can't.
797 By default the file is rw for everyone, with the user's umask taking
798 care of turning off the permissions the user wants off. */
800 if ((fd
< 0) && mapped
)
803 symsfilename
= concat ("./", basename (filename
), ".syms",
805 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
809 printf_unfiltered (error_pre_print
);
811 print_sys_errmsg (symsfilename
, errno
);
819 /* Return the base address at which we would like the next objfile's
820 mapped data to start.
822 For now, we use the kludge that the configuration specifies a base
823 address to which it is safe to map the first mmalloc heap, and an
824 increment to add to this address for each successive heap. There are
825 a lot of issues to deal with here to make this work reasonably, including:
827 Avoid memory collisions with existing mapped address spaces
829 Reclaim address spaces when their mmalloc heaps are unmapped
831 When mmalloc heaps are shared between processes they have to be
832 mapped at the same addresses in each
834 Once created, a mmalloc heap that is to be mapped back in must be
835 mapped at the original address. I.E. each objfile will expect to
836 be remapped at it's original address. This becomes a problem if
837 the desired address is already in use.
848 #if defined(MMAP_BASE_ADDRESS) && defined (MMAP_INCREMENT)
850 static CORE_ADDR next
= MMAP_BASE_ADDRESS
;
851 CORE_ADDR mapto
= next
;
853 next
+= MMAP_INCREMENT
;
864 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
866 /* Returns a section whose range includes PC or NULL if none found. */
872 struct obj_section
*s
;
873 struct objfile
*objfile
;
875 ALL_OBJFILES (objfile
)
876 for (s
= objfile
->sections
; s
< objfile
->sections_end
; ++s
)
884 /* In SVR4, we recognize a trampoline by it's section name.
885 That is, if the pc is in a section named ".plt" then we are in
889 in_plt_section(pc
, name
)
893 struct obj_section
*s
;
896 s
= find_pc_section(pc
);
899 && s
->the_bfd_section
->name
!= NULL
900 && STREQ (s
->the_bfd_section
->name
, ".plt"));