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>
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 /* Externally visible variables that are owned by this module.
53 See declarations in objfile.h for more info. */
55 struct objfile
*object_files
; /* Linked list of all objfiles */
56 struct objfile
*current_objfile
; /* For symbol file being read in */
57 struct objfile
*symfile_objfile
; /* Main symbol table loaded from */
58 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
60 int mapped_symbol_files
; /* Try to use mapped symbol files */
62 /* Locate all mappable sections of a BFD file.
63 objfile_p_char is a char * to get it through
64 bfd_map_over_sections; we cast it back to its proper type. */
67 add_to_objfile_sections (abfd
, asect
, objfile_p_char
)
72 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
73 struct obj_section section
;
76 aflag
= bfd_get_section_flags (abfd
, asect
);
77 if (!(aflag
& SEC_ALLOC
))
79 if (0 == bfd_section_size (abfd
, asect
))
82 section
.objfile
= objfile
;
83 section
.the_bfd_section
= asect
;
84 section
.addr
= bfd_section_vma (abfd
, asect
);
85 section
.endaddr
= section
.addr
+ bfd_section_size (abfd
, asect
);
86 obstack_grow (&objfile
->psymbol_obstack
, §ion
, sizeof(section
));
87 objfile
->sections_end
= (struct obj_section
*) (((unsigned long) objfile
->sections_end
) + 1);
90 /* Builds a section table for OBJFILE.
91 Returns 0 if OK, 1 on error (in which case bfd_error contains the
95 build_objfile_section_table (objfile
)
96 struct objfile
*objfile
;
98 /* objfile->sections can be already set when reading a mapped symbol
99 file. I believe that we do need to rebuild the section table in
100 this case (we rebuild other things derived from the bfd), but we
101 can't free the old one (it's in the psymbol_obstack). So we just
102 waste some memory. */
104 objfile
->sections_end
= 0;
105 bfd_map_over_sections (objfile
->obfd
, add_to_objfile_sections
, (char *)objfile
);
106 objfile
->sections
= (struct obj_section
*)
107 obstack_finish (&objfile
->psymbol_obstack
);
108 objfile
->sections_end
= objfile
->sections
+ (unsigned long) objfile
->sections_end
;
112 /* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
113 whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
114 struct, fill it in as best we can, link it into the list of all known
115 objfiles, and return a pointer to the new objfile struct. */
118 allocate_objfile (abfd
, mapped
)
122 struct objfile
*objfile
= NULL
;
123 struct objfile
*last_one
= NULL
;
125 mapped
|= mapped_symbol_files
;
127 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
130 /* If we can support mapped symbol files, try to open/reopen the
131 mapped file that corresponds to the file from which we wish to
132 read symbols. If the objfile is to be mapped, we must malloc
133 the structure itself using the mmap version, and arrange that
134 all memory allocation for the objfile uses the mmap routines.
135 If we are reusing an existing mapped file, from which we get
136 our objfile pointer, we have to make sure that we update the
137 pointers to the alloc/free functions in the obstack, in case
138 these functions have moved within the current gdb. */
142 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
149 if (((mapto
= map_to_address ()) == 0) ||
150 ((md
= mmalloc_attach (fd
, (PTR
) mapto
)) == NULL
))
154 else if ((objfile
= (struct objfile
*) mmalloc_getkey (md
, 0)) != NULL
)
156 /* Update memory corruption handler function addresses. */
159 objfile
-> mmfd
= fd
;
160 /* Update pointers to functions to *our* copies */
161 obstack_chunkfun (&objfile
-> psymbol_obstack
, xmmalloc
);
162 obstack_freefun (&objfile
-> psymbol_obstack
, mfree
);
163 obstack_chunkfun (&objfile
-> symbol_obstack
, xmmalloc
);
164 obstack_freefun (&objfile
-> symbol_obstack
, mfree
);
165 obstack_chunkfun (&objfile
-> type_obstack
, xmmalloc
);
166 obstack_freefun (&objfile
-> type_obstack
, mfree
);
167 /* If already in objfile list, unlink it. */
168 unlink_objfile (objfile
);
169 /* Forget things specific to a particular gdb, may have changed. */
170 objfile
-> sf
= NULL
;
175 /* Set up to detect internal memory corruption. MUST be
176 done before the first malloc. See comments in
177 init_malloc() and mmcheck(). */
181 objfile
= (struct objfile
*)
182 xmmalloc (md
, sizeof (struct objfile
));
183 memset (objfile
, 0, sizeof (struct objfile
));
185 objfile
-> mmfd
= fd
;
186 objfile
-> flags
|= OBJF_MAPPED
;
187 mmalloc_setkey (objfile
-> md
, 0, objfile
);
188 obstack_specify_allocation_with_arg (&objfile
-> psymbol_obstack
,
189 0, 0, xmmalloc
, mfree
,
191 obstack_specify_allocation_with_arg (&objfile
-> symbol_obstack
,
192 0, 0, xmmalloc
, mfree
,
194 obstack_specify_allocation_with_arg (&objfile
-> type_obstack
,
195 0, 0, xmmalloc
, mfree
,
200 if (mapped
&& (objfile
== NULL
))
202 warning ("symbol table for '%s' will not be mapped",
203 bfd_get_filename (abfd
));
206 #else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
210 warning ("this version of gdb does not support mapped symbol tables.");
212 /* Turn off the global flag so we don't try to do mapped symbol tables
213 any more, which shuts up gdb unless the user specifically gives the
214 "mapped" keyword again. */
216 mapped_symbol_files
= 0;
219 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
221 /* If we don't support mapped symbol files, didn't ask for the file to be
222 mapped, or failed to open the mapped file for some reason, then revert
223 back to an unmapped objfile. */
227 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
228 memset (objfile
, 0, sizeof (struct objfile
));
229 objfile
-> md
= NULL
;
230 obstack_specify_allocation (&objfile
-> psymbol_obstack
, 0, 0, xmalloc
,
232 obstack_specify_allocation (&objfile
-> symbol_obstack
, 0, 0, xmalloc
,
234 obstack_specify_allocation (&objfile
-> type_obstack
, 0, 0, xmalloc
,
238 /* Update the per-objfile information that comes from the bfd, ensuring
239 that any data that is reference is saved in the per-objfile data
242 objfile
-> obfd
= abfd
;
243 if (objfile
-> name
!= NULL
)
245 mfree (objfile
-> md
, objfile
-> name
);
247 objfile
-> name
= mstrsave (objfile
-> md
, bfd_get_filename (abfd
));
248 objfile
-> mtime
= bfd_get_mtime (abfd
);
250 /* Build section table. */
252 if (build_objfile_section_table (objfile
))
254 error ("Can't find the file sections in `%s': %s",
255 objfile
-> name
, bfd_errmsg (bfd_get_error ()));
258 /* Add this file onto the tail of the linked list of other such files. */
260 objfile
-> next
= NULL
;
261 if (object_files
== NULL
)
262 object_files
= objfile
;
265 for (last_one
= object_files
;
267 last_one
= last_one
-> next
);
268 last_one
-> next
= objfile
;
273 /* Put OBJFILE at the front of the list. */
276 objfile_to_front (objfile
)
277 struct objfile
*objfile
;
279 struct objfile
**objp
;
280 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
282 if (*objp
== objfile
)
284 /* Unhook it from where it is. */
285 *objp
= objfile
->next
;
286 /* Put it in the front. */
287 objfile
->next
= object_files
;
288 object_files
= objfile
;
294 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
297 It is not a bug, or error, to call this function if OBJFILE is not known
298 to be in the current list. This is done in the case of mapped objfiles,
299 for example, just to ensure that the mapped objfile doesn't appear twice
300 in the list. Since the list is threaded, linking in a mapped objfile
301 twice would create a circular list.
303 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
304 unlinking it, just to ensure that we have completely severed any linkages
305 between the OBJFILE and the list. */
308 unlink_objfile (objfile
)
309 struct objfile
*objfile
;
311 struct objfile
** objpp
;
313 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
) -> next
))
315 if (*objpp
== objfile
)
317 *objpp
= (*objpp
) -> next
;
318 objfile
-> next
= NULL
;
325 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
326 that as much as possible is allocated on the symbol_obstack and
327 psymbol_obstack, so that the memory can be efficiently freed.
329 Things which we do NOT free because they are not in malloc'd memory
330 or not in memory specific to the objfile include:
334 FIXME: If the objfile is using reusable symbol information (via mmalloc),
335 then we need to take into account the fact that more than one process
336 may be using the symbol information at the same time (when mmalloc is
337 extended to support cooperative locking). When more than one process
338 is using the mapped symbol info, we need to be more careful about when
339 we free objects in the reusable area. */
342 free_objfile (objfile
)
343 struct objfile
*objfile
;
345 /* First do any symbol file specific actions required when we are
346 finished with a particular symbol file. Note that if the objfile
347 is using reusable symbol information (via mmalloc) then each of
348 these routines is responsible for doing the correct thing, either
349 freeing things which are valid only during this particular gdb
350 execution, or leaving them to be reused during the next one. */
352 if (objfile
-> sf
!= NULL
)
354 (*objfile
-> sf
-> sym_finish
) (objfile
);
357 /* We always close the bfd. */
359 if (objfile
-> obfd
!= NULL
)
361 char *name
= bfd_get_filename (objfile
->obfd
);
362 if (!bfd_close (objfile
-> obfd
))
363 warning ("cannot close \"%s\": %s",
364 name
, bfd_errmsg (bfd_get_error ()));
368 /* Remove it from the chain of all objfiles. */
370 unlink_objfile (objfile
);
372 /* If we are going to free the runtime common objfile, mark it
375 if (objfile
== rt_common_objfile
)
376 rt_common_objfile
= NULL
;
378 /* Before the symbol table code was redone to make it easier to
379 selectively load and remove information particular to a specific
380 linkage unit, gdb used to do these things whenever the monolithic
381 symbol table was blown away. How much still needs to be done
382 is unknown, but we play it safe for now and keep each action until
383 it is shown to be no longer needed. */
385 #if defined (CLEAR_SOLIB)
387 /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
388 the to_sections for a core file might refer to those bfd's. So
389 detach any core file. */
391 struct target_ops
*t
= find_core_target ();
393 (t
->to_detach
) (NULL
, 0);
396 /* I *think* all our callers call clear_symtab_users. If so, no need
397 to call this here. */
398 clear_pc_function_cache ();
400 /* The last thing we do is free the objfile struct itself for the
401 non-reusable case, or detach from the mapped file for the reusable
402 case. Note that the mmalloc_detach or the mfree is the last thing
403 we can do with this objfile. */
405 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
407 if (objfile
-> flags
& OBJF_MAPPED
)
409 /* Remember the fd so we can close it. We can't close it before
410 doing the detach, and after the detach the objfile is gone. */
413 mmfd
= objfile
-> mmfd
;
414 mmalloc_detach (objfile
-> md
);
419 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
421 /* If we still have an objfile, then either we don't support reusable
422 objfiles or this one was not reusable. So free it normally. */
426 if (objfile
-> name
!= NULL
)
428 mfree (objfile
-> md
, objfile
-> name
);
430 if (objfile
->global_psymbols
.list
)
431 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
432 if (objfile
->static_psymbols
.list
)
433 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
434 /* Free the obstacks for non-reusable objfiles */
435 obstack_free (&objfile
-> psymbol_obstack
, 0);
436 obstack_free (&objfile
-> symbol_obstack
, 0);
437 obstack_free (&objfile
-> type_obstack
, 0);
438 mfree (objfile
-> md
, objfile
);
444 /* Free all the object files at once and clean up their users. */
449 struct objfile
*objfile
, *temp
;
451 ALL_OBJFILES_SAFE (objfile
, temp
)
453 free_objfile (objfile
);
455 clear_symtab_users ();
458 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
459 entries in new_offsets. */
461 objfile_relocate (objfile
, new_offsets
)
462 struct objfile
*objfile
;
463 struct section_offsets
*new_offsets
;
465 struct section_offsets
*delta
= (struct section_offsets
*) alloca
466 (sizeof (struct section_offsets
)
467 + objfile
->num_sections
* sizeof (delta
->offsets
));
471 int something_changed
= 0;
472 for (i
= 0; i
< objfile
->num_sections
; ++i
)
474 ANOFFSET (delta
, i
) =
475 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
476 if (ANOFFSET (delta
, i
) != 0)
477 something_changed
= 1;
479 if (!something_changed
)
483 /* OK, get all the symtabs. */
487 ALL_OBJFILE_SYMTABS (objfile
, s
)
490 struct blockvector
*bv
;
493 /* First the line table. */
497 for (i
= 0; i
< l
->nitems
; ++i
)
498 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
501 /* Don't relocate a shared blockvector more than once. */
505 bv
= BLOCKVECTOR (s
);
506 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
511 b
= BLOCKVECTOR_BLOCK (bv
, i
);
512 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
513 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
515 for (j
= 0; j
< BLOCK_NSYMS (b
); ++j
)
517 struct symbol
*sym
= BLOCK_SYM (b
, j
);
518 /* The RS6000 code from which this was taken skipped
519 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
520 But I'm leaving out that test, on the theory that
521 they can't possibly pass the tests below. */
522 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
523 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
524 && SYMBOL_SECTION (sym
) >= 0)
526 SYMBOL_VALUE_ADDRESS (sym
) +=
527 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
529 #ifdef MIPS_EFI_SYMBOL_NAME
530 /* Relocate Extra Function Info for ecoff. */
533 if (SYMBOL_CLASS (sym
) == LOC_CONST
534 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
535 && STRCMP (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
536 ecoff_relocate_efi (sym
, ANOFFSET (delta
, s
->block_line_section
));
544 struct partial_symtab
*p
;
546 ALL_OBJFILE_PSYMTABS (objfile
, p
)
548 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
549 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
554 struct partial_symbol
*psym
;
556 for (psym
= objfile
->global_psymbols
.list
;
557 psym
< objfile
->global_psymbols
.next
;
559 if (SYMBOL_SECTION (psym
) >= 0)
560 SYMBOL_VALUE_ADDRESS (psym
) += ANOFFSET (delta
, SYMBOL_SECTION (psym
));
561 for (psym
= objfile
->static_psymbols
.list
;
562 psym
< objfile
->static_psymbols
.next
;
564 if (SYMBOL_SECTION (psym
) >= 0)
565 SYMBOL_VALUE_ADDRESS (psym
) += ANOFFSET (delta
, SYMBOL_SECTION (psym
));
569 struct minimal_symbol
*msym
;
570 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
571 if (SYMBOL_SECTION (msym
) >= 0)
572 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
574 /* Relocating different sections by different amounts may cause the symbols
575 to be out of order. */
576 msymbols_sort (objfile
);
580 for (i
= 0; i
< objfile
->num_sections
; ++i
)
581 ANOFFSET (objfile
->section_offsets
, i
) = ANOFFSET (new_offsets
, i
);
585 struct obj_section
*s
;
588 abfd
= objfile
->obfd
;
590 for (s
= objfile
->sections
;
591 s
< objfile
->sections_end
; ++s
)
595 flags
= bfd_get_section_flags (abfd
, s
->the_bfd_section
);
597 if (flags
& SEC_CODE
)
599 s
->addr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
600 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
602 else if (flags
& (SEC_DATA
| SEC_LOAD
))
604 s
->addr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
605 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_DATA
);
607 else if (flags
& SEC_ALLOC
)
609 s
->addr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
610 s
->endaddr
+= ANOFFSET (delta
, SECT_OFF_BSS
);
615 if (objfile
->ei
.entry_point
!= ~0)
616 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
618 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
620 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
621 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
624 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
626 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
627 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
630 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
632 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
633 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT
);
637 /* Many places in gdb want to test just to see if we have any partial
638 symbols available. This function returns zero if none are currently
639 available, nonzero otherwise. */
642 have_partial_symbols ()
648 if (ofp
-> psymtabs
!= NULL
)
656 /* Many places in gdb want to test just to see if we have any full
657 symbols available. This function returns zero if none are currently
658 available, nonzero otherwise. */
667 if (ofp
-> symtabs
!= NULL
)
675 /* Many places in gdb want to test just to see if we have any minimal
676 symbols available. This function returns zero if none are currently
677 available, nonzero otherwise. */
680 have_minimal_symbols ()
686 if (ofp
-> msymbols
!= NULL
)
694 #if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
696 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
697 of the corresponding symbol file in MTIME, try to open an existing file
698 with the name SYMSFILENAME and verify it is more recent than the base
699 file by checking it's timestamp against MTIME.
701 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
703 If SYMSFILENAME does exist, but is out of date, we check to see if the
704 user has specified creation of a mapped file. If so, we don't issue
705 any warning message because we will be creating a new mapped file anyway,
706 overwriting the old one. If not, then we issue a warning message so that
707 the user will know why we aren't using this existing mapped symbol file.
708 In either case, we return -1.
710 If SYMSFILENAME does exist and is not out of date, but can't be opened for
711 some reason, then prints an appropriate system error message and returns -1.
713 Otherwise, returns the open file descriptor. */
716 open_existing_mapped_file (symsfilename
, mtime
, mapped
)
724 if (stat (symsfilename
, &sbuf
) == 0)
726 if (sbuf
.st_mtime
< mtime
)
730 warning ("mapped symbol file `%s' is out of date, ignored it",
734 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
738 printf_unfiltered (error_pre_print
);
740 print_sys_errmsg (symsfilename
, errno
);
746 /* Look for a mapped symbol file that corresponds to FILENAME and is more
747 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
748 use a mapped symbol file for this file, so create a new one if one does
751 If found, then return an open file descriptor for the file, otherwise
754 This routine is responsible for implementing the policy that generates
755 the name of the mapped symbol file from the name of a file containing
756 symbols that gdb would like to read. Currently this policy is to append
757 ".syms" to the name of the file.
759 This routine is also responsible for implementing the policy that
760 determines where the mapped symbol file is found (the search path).
761 This policy is that when reading an existing mapped file, a file of
762 the correct name in the current directory takes precedence over a
763 file of the correct name in the same directory as the symbol file.
764 When creating a new mapped file, it is always created in the current
765 directory. This helps to minimize the chances of a user unknowingly
766 creating big mapped files in places like /bin and /usr/local/bin, and
767 allows a local copy to override a manually installed global copy (in
768 /bin for example). */
771 open_mapped_file (filename
, mtime
, mapped
)
779 /* First try to open an existing file in the current directory, and
780 then try the directory where the symbol file is located. */
782 symsfilename
= concat ("./", basename (filename
), ".syms", (char *) NULL
);
783 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
)) < 0)
786 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
787 fd
= open_existing_mapped_file (symsfilename
, mtime
, mapped
);
790 /* If we don't have an open file by now, then either the file does not
791 already exist, or the base file has changed since it was created. In
792 either case, if the user has specified use of a mapped file, then
793 create a new mapped file, truncating any existing one. If we can't
794 create one, print a system error message saying why we can't.
796 By default the file is rw for everyone, with the user's umask taking
797 care of turning off the permissions the user wants off. */
799 if ((fd
< 0) && mapped
)
802 symsfilename
= concat ("./", basename (filename
), ".syms",
804 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
808 printf_unfiltered (error_pre_print
);
810 print_sys_errmsg (symsfilename
, errno
);
818 /* Return the base address at which we would like the next objfile's
819 mapped data to start.
821 For now, we use the kludge that the configuration specifies a base
822 address to which it is safe to map the first mmalloc heap, and an
823 increment to add to this address for each successive heap. There are
824 a lot of issues to deal with here to make this work reasonably, including:
826 Avoid memory collisions with existing mapped address spaces
828 Reclaim address spaces when their mmalloc heaps are unmapped
830 When mmalloc heaps are shared between processes they have to be
831 mapped at the same addresses in each
833 Once created, a mmalloc heap that is to be mapped back in must be
834 mapped at the original address. I.E. each objfile will expect to
835 be remapped at it's original address. This becomes a problem if
836 the desired address is already in use.
847 #if defined(MMAP_BASE_ADDRESS) && defined (MMAP_INCREMENT)
849 static CORE_ADDR next
= MMAP_BASE_ADDRESS
;
850 CORE_ADDR mapto
= next
;
852 next
+= MMAP_INCREMENT
;
863 #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
865 /* Returns a section whose range includes PC or NULL if none found. */
871 struct obj_section
*s
;
872 struct objfile
*objfile
;
874 ALL_OBJFILES (objfile
)
875 for (s
= objfile
->sections
; s
< objfile
->sections_end
; ++s
)
883 /* In SVR4, we recognize a trampoline by it's section name.
884 That is, if the pc is in a section named ".plt" then we are in
888 in_plt_section(pc
, name
)
892 struct obj_section
*s
;
895 s
= find_pc_section(pc
);
898 && s
->the_bfd_section
->name
!= NULL
899 && STREQ (s
->the_bfd_section
->name
, ".plt"));