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., 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>
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
, §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_obstack
, xmmalloc
);
163 obstack_freefun (&objfile
-> psymbol_obstack
, mfree
);
164 obstack_chunkfun (&objfile
-> symbol_obstack
, xmmalloc
);
165 obstack_freefun (&objfile
-> symbol_obstack
, mfree
);
166 obstack_chunkfun (&objfile
-> type_obstack
, xmmalloc
);
167 obstack_freefun (&objfile
-> type_obstack
, mfree
);
168 /* If already in objfile list, unlink it. */
169 unlink_objfile (objfile
);
170 /* Forget things specific to a particular gdb, may have changed. */
171 objfile
-> sf
= NULL
;
176 /* Set up to detect internal memory corruption. MUST be
177 done before the first malloc. See comments in
178 init_malloc() and mmcheck(). */
182 objfile
= (struct objfile
*)
183 xmmalloc (md
, sizeof (struct objfile
));
184 memset (objfile
, 0, sizeof (struct objfile
));
186 objfile
-> mmfd
= fd
;
187 objfile
-> flags
|= OBJF_MAPPED
;
188 mmalloc_setkey (objfile
-> md
, 0, objfile
);
189 obstack_specify_allocation_with_arg (&objfile
-> psymbol_obstack
,
190 0, 0, xmmalloc
, mfree
,
192 obstack_specify_allocation_with_arg (&objfile
-> symbol_obstack
,
193 0, 0, xmmalloc
, mfree
,
195 obstack_specify_allocation_with_arg (&objfile
-> type_obstack
,
196 0, 0, xmmalloc
, mfree
,
201 if (mapped
&& (objfile
== NULL
))
203 warning ("symbol table for '%s' will not be mapped",
204 bfd_get_filename (abfd
));
207 #else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
211 warning ("this version of gdb does not support mapped symbol tables.");
213 /* Turn off the global flag so we don't try to do mapped symbol tables
214 any more, which shuts up gdb unless the user specifically gives the
215 "mapped" keyword again. */
217 mapped_symbol_files
= 0;
220 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
222 /* If we don't support mapped symbol files, didn't ask for the file to be
223 mapped, or failed to open the mapped file for some reason, then revert
224 back to an unmapped objfile. */
228 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
229 memset (objfile
, 0, sizeof (struct objfile
));
230 objfile
-> md
= NULL
;
231 obstack_specify_allocation (&objfile
-> psymbol_obstack
, 0, 0, xmalloc
,
233 obstack_specify_allocation (&objfile
-> symbol_obstack
, 0, 0, xmalloc
,
235 obstack_specify_allocation (&objfile
-> type_obstack
, 0, 0, xmalloc
,
239 /* Update the per-objfile information that comes from the bfd, ensuring
240 that any data that is reference is saved in the per-objfile data
243 objfile
-> obfd
= abfd
;
244 if (objfile
-> name
!= NULL
)
246 mfree (objfile
-> md
, objfile
-> name
);
248 objfile
-> name
= mstrsave (objfile
-> md
, bfd_get_filename (abfd
));
249 objfile
-> mtime
= bfd_get_mtime (abfd
);
251 /* Build section table. */
253 if (build_objfile_section_table (objfile
))
255 error ("Can't find the file sections in `%s': %s",
256 objfile
-> name
, bfd_errmsg (bfd_get_error ()));
259 /* Add this file onto the tail of the linked list of other such files. */
261 objfile
-> next
= NULL
;
262 if (object_files
== NULL
)
263 object_files
= objfile
;
266 for (last_one
= object_files
;
268 last_one
= last_one
-> next
);
269 last_one
-> next
= objfile
;
274 /* Put OBJFILE at the front of the list. */
277 objfile_to_front (objfile
)
278 struct objfile
*objfile
;
280 struct objfile
**objp
;
281 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
283 if (*objp
== objfile
)
285 /* Unhook it from where it is. */
286 *objp
= objfile
->next
;
287 /* Put it in the front. */
288 objfile
->next
= object_files
;
289 object_files
= objfile
;
295 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
298 It is not a bug, or error, to call this function if OBJFILE is not known
299 to be in the current list. This is done in the case of mapped objfiles,
300 for example, just to ensure that the mapped objfile doesn't appear twice
301 in the list. Since the list is threaded, linking in a mapped objfile
302 twice would create a circular list.
304 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
305 unlinking it, just to ensure that we have completely severed any linkages
306 between the OBJFILE and the list. */
309 unlink_objfile (objfile
)
310 struct objfile
*objfile
;
312 struct objfile
** objpp
;
314 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
) -> next
))
316 if (*objpp
== objfile
)
318 *objpp
= (*objpp
) -> next
;
319 objfile
-> next
= NULL
;
326 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
327 that as much as possible is allocated on the symbol_obstack and
328 psymbol_obstack, so that the memory can be efficiently freed.
330 Things which we do NOT free because they are not in malloc'd memory
331 or not in memory specific to the objfile include:
335 FIXME: If the objfile is using reusable symbol information (via mmalloc),
336 then we need to take into account the fact that more than one process
337 may be using the symbol information at the same time (when mmalloc is
338 extended to support cooperative locking). When more than one process
339 is using the mapped symbol info, we need to be more careful about when
340 we free objects in the reusable area. */
343 free_objfile (objfile
)
344 struct objfile
*objfile
;
346 /* First do any symbol file specific actions required when we are
347 finished with a particular symbol file. Note that if the objfile
348 is using reusable symbol information (via mmalloc) then each of
349 these routines is responsible for doing the correct thing, either
350 freeing things which are valid only during this particular gdb
351 execution, or leaving them to be reused during the next one. */
353 if (objfile
-> sf
!= NULL
)
355 (*objfile
-> sf
-> sym_finish
) (objfile
);
358 /* We always close the bfd. */
360 if (objfile
-> obfd
!= NULL
)
362 char *name
= bfd_get_filename (objfile
->obfd
);
363 if (!bfd_close (objfile
-> obfd
))
364 warning ("cannot close \"%s\": %s",
365 name
, bfd_errmsg (bfd_get_error ()));
369 /* Remove it from the chain of all objfiles. */
371 unlink_objfile (objfile
);
373 /* If we are going to free the runtime common objfile, mark it
376 if (objfile
== rt_common_objfile
)
377 rt_common_objfile
= NULL
;
379 /* Before the symbol table code was redone to make it easier to
380 selectively load and remove information particular to a specific
381 linkage unit, gdb used to do these things whenever the monolithic
382 symbol table was blown away. How much still needs to be done
383 is unknown, but we play it safe for now and keep each action until
384 it is shown to be no longer needed. */
386 #if defined (CLEAR_SOLIB)
388 /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
389 the to_sections for a core file might refer to those bfd's. So
390 detach any core file. */
392 struct target_ops
*t
= find_core_target ();
394 (t
->to_detach
) (NULL
, 0);
397 /* I *think* all our callers call clear_symtab_users. If so, no need
398 to call this here. */
399 clear_pc_function_cache ();
401 /* The last thing we do is free the objfile struct itself for the
402 non-reusable case, or detach from the mapped file for the reusable
403 case. Note that the mmalloc_detach or the mfree is the last thing
404 we can do with this objfile. */
406 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
408 if (objfile
-> flags
& OBJF_MAPPED
)
410 /* Remember the fd so we can close it. We can't close it before
411 doing the detach, and after the detach the objfile is gone. */
414 mmfd
= objfile
-> mmfd
;
415 mmalloc_detach (objfile
-> md
);
420 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
422 /* If we still have an objfile, then either we don't support reusable
423 objfiles or this one was not reusable. So free it normally. */
427 if (objfile
-> name
!= NULL
)
429 mfree (objfile
-> md
, objfile
-> name
);
431 if (objfile
->global_psymbols
.list
)
432 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
433 if (objfile
->static_psymbols
.list
)
434 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
435 /* Free the obstacks for non-reusable objfiles */
436 obstack_free (&objfile
-> psymbol_obstack
, 0);
437 obstack_free (&objfile
-> symbol_obstack
, 0);
438 obstack_free (&objfile
-> type_obstack
, 0);
439 mfree (objfile
-> md
, objfile
);
445 /* Free all the object files at once and clean up their users. */
450 struct objfile
*objfile
, *temp
;
452 ALL_OBJFILES_SAFE (objfile
, temp
)
454 free_objfile (objfile
);
456 clear_symtab_users ();
459 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
460 entries in new_offsets. */
462 objfile_relocate (objfile
, new_offsets
)
463 struct objfile
*objfile
;
464 struct section_offsets
*new_offsets
;
466 struct section_offsets
*delta
= (struct section_offsets
*) alloca
467 (sizeof (struct section_offsets
)
468 + objfile
->num_sections
* sizeof (delta
->offsets
));
472 int something_changed
= 0;
473 for (i
= 0; i
< objfile
->num_sections
; ++i
)
475 ANOFFSET (delta
, i
) =
476 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
477 if (ANOFFSET (delta
, i
) != 0)
478 something_changed
= 1;
480 if (!something_changed
)
484 /* OK, get all the symtabs. */
488 ALL_OBJFILE_SYMTABS (objfile
, s
)
491 struct blockvector
*bv
;
494 /* First the line table. */
498 for (i
= 0; i
< l
->nitems
; ++i
)
499 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
502 /* Don't relocate a shared blockvector more than once. */
506 bv
= BLOCKVECTOR (s
);
507 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
512 b
= BLOCKVECTOR_BLOCK (bv
, i
);
513 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
514 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
516 for (j
= 0; j
< BLOCK_NSYMS (b
); ++j
)
518 struct symbol
*sym
= BLOCK_SYM (b
, j
);
519 /* The RS6000 code from which this was taken skipped
520 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
521 But I'm leaving out that test, on the theory that
522 they can't possibly pass the tests below. */
523 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
524 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
525 && SYMBOL_SECTION (sym
) >= 0)
527 SYMBOL_VALUE_ADDRESS (sym
) +=
528 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
530 #ifdef MIPS_EFI_SYMBOL_NAME
531 /* Relocate Extra Function Info for ecoff. */
534 if (SYMBOL_CLASS (sym
) == LOC_CONST
535 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
536 && STRCMP (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
537 ecoff_relocate_efi (sym
, ANOFFSET (delta
, s
->block_line_section
));
545 struct partial_symtab
*p
;
547 ALL_OBJFILE_PSYMTABS (objfile
, p
)
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"));