1 /* GDB routines for manipulating objfiles.
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Contributed by Cygnus Support, using pieces from other GDB modules.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* This file contains support routines for creating, manipulating, and
24 destroying objfile structures. */
27 #include "bfd.h" /* Binary File Description */
31 #include "gdb-stabs.h"
34 #include <sys/types.h>
38 #include "gdb_string.h"
40 #include "breakpoint.h"
42 /* Prototypes for local functions */
44 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
46 static int open_existing_mapped_file (char *, long, int);
48 static int open_mapped_file (char *filename
, long mtime
, int flags
);
50 static PTR
map_to_file (int);
52 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
54 static void add_to_objfile_sections (bfd
*, sec_ptr
, PTR
);
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 */
62 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
64 int mapped_symbol_files
; /* Try to use mapped symbol files */
66 /* Locate all mappable sections of a BFD file.
67 objfile_p_char is a char * to get it through
68 bfd_map_over_sections; we cast it back to its proper type. */
70 #ifndef TARGET_KEEP_SECTION
71 #define TARGET_KEEP_SECTION(ASECT) 0
74 /* Called via bfd_map_over_sections to build up the section table that
75 the objfile references. The objfile contains pointers to the start
76 of the table (objfile->sections) and to the first location after
77 the end of the table (objfile->sections_end). */
80 add_to_objfile_sections (bfd
*abfd
, sec_ptr asect
, PTR objfile_p_char
)
82 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
83 struct obj_section section
;
86 aflag
= bfd_get_section_flags (abfd
, asect
);
88 if (!(aflag
& SEC_ALLOC
) && !(TARGET_KEEP_SECTION (asect
)))
91 if (0 == bfd_section_size (abfd
, asect
))
94 section
.objfile
= objfile
;
95 section
.the_bfd_section
= asect
;
96 section
.ovly_mapped
= 0;
97 section
.addr
= bfd_section_vma (abfd
, asect
);
98 section
.endaddr
= section
.addr
+ bfd_section_size (abfd
, asect
);
99 obstack_grow (&objfile
->psymbol_obstack
, (char *) §ion
, sizeof (section
));
100 objfile
->sections_end
= (struct obj_section
*) (((unsigned long) objfile
->sections_end
) + 1);
103 /* Builds a section table for OBJFILE.
104 Returns 0 if OK, 1 on error (in which case bfd_error contains the
107 Note that while we are building the table, which goes into the
108 psymbol obstack, we hijack the sections_end pointer to instead hold
109 a count of the number of sections. When bfd_map_over_sections
110 returns, this count is used to compute the pointer to the end of
111 the sections table, which then overwrites the count.
113 Also note that the OFFSET and OVLY_MAPPED in each table entry
114 are initialized to zero.
116 Also note that if anything else writes to the psymbol obstack while
117 we are building the table, we're pretty much hosed. */
120 build_objfile_section_table (struct objfile
*objfile
)
122 /* objfile->sections can be already set when reading a mapped symbol
123 file. I believe that we do need to rebuild the section table in
124 this case (we rebuild other things derived from the bfd), but we
125 can't free the old one (it's in the psymbol_obstack). So we just
126 waste some memory. */
128 objfile
->sections_end
= 0;
129 bfd_map_over_sections (objfile
->obfd
, add_to_objfile_sections
, (char *) objfile
);
130 objfile
->sections
= (struct obj_section
*)
131 obstack_finish (&objfile
->psymbol_obstack
);
132 objfile
->sections_end
= objfile
->sections
+ (unsigned long) objfile
->sections_end
;
136 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
137 allocate a new objfile struct, fill it in as best we can, link it
138 into the list of all known objfiles, and return a pointer to the
141 The FLAGS word contains various bits (OBJF_*) that can be taken as
142 requests for specific operations, like trying to open a mapped
143 version of the objfile (OBJF_MAPPED). Other bits like
144 OBJF_SHARED are simply copied through to the new objfile flags
148 allocate_objfile (bfd
*abfd
, int flags
)
150 struct objfile
*objfile
= NULL
;
151 struct objfile
*last_one
= NULL
;
153 if (mapped_symbol_files
)
154 flags
|= OBJF_MAPPED
;
156 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
160 /* If we can support mapped symbol files, try to open/reopen the
161 mapped file that corresponds to the file from which we wish to
162 read symbols. If the objfile is to be mapped, we must malloc
163 the structure itself using the mmap version, and arrange that
164 all memory allocation for the objfile uses the mmap routines.
165 If we are reusing an existing mapped file, from which we get
166 our objfile pointer, we have to make sure that we update the
167 pointers to the alloc/free functions in the obstack, in case
168 these functions have moved within the current gdb. */
172 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
178 if ((md
= map_to_file (fd
)) == NULL
)
182 else if ((objfile
= (struct objfile
*) mmalloc_getkey (md
, 0)) != NULL
)
184 /* Update memory corruption handler function addresses. */
188 /* Update pointers to functions to *our* copies */
189 obstack_chunkfun (&objfile
->psymbol_cache
.cache
, xmmalloc
);
190 obstack_freefun (&objfile
->psymbol_cache
.cache
, mfree
);
191 obstack_chunkfun (&objfile
->psymbol_obstack
, xmmalloc
);
192 obstack_freefun (&objfile
->psymbol_obstack
, mfree
);
193 obstack_chunkfun (&objfile
->symbol_obstack
, xmmalloc
);
194 obstack_freefun (&objfile
->symbol_obstack
, mfree
);
195 obstack_chunkfun (&objfile
->type_obstack
, xmmalloc
);
196 obstack_freefun (&objfile
->type_obstack
, mfree
);
197 /* If already in objfile list, unlink it. */
198 unlink_objfile (objfile
);
199 /* Forget things specific to a particular gdb, may have changed. */
205 /* Set up to detect internal memory corruption. MUST be
206 done before the first malloc. See comments in
207 init_malloc() and mmcheck(). */
211 objfile
= (struct objfile
*)
212 xmmalloc (md
, sizeof (struct objfile
));
213 memset (objfile
, 0, sizeof (struct objfile
));
216 objfile
->flags
|= OBJF_MAPPED
;
217 mmalloc_setkey (objfile
->md
, 0, objfile
);
218 obstack_specify_allocation_with_arg (&objfile
->psymbol_cache
.cache
,
219 0, 0, xmmalloc
, mfree
,
221 obstack_specify_allocation_with_arg (&objfile
->psymbol_obstack
,
222 0, 0, xmmalloc
, mfree
,
224 obstack_specify_allocation_with_arg (&objfile
->symbol_obstack
,
225 0, 0, xmmalloc
, mfree
,
227 obstack_specify_allocation_with_arg (&objfile
->type_obstack
,
228 0, 0, xmmalloc
, mfree
,
233 if ((flags
& OBJF_MAPPED
) && (objfile
== NULL
))
235 warning ("symbol table for '%s' will not be mapped",
236 bfd_get_filename (abfd
));
237 flags
&= ~OBJF_MAPPED
;
240 #else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
242 if (flags
& OBJF_MAPPED
)
244 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
246 /* Turn off the global flag so we don't try to do mapped symbol tables
247 any more, which shuts up gdb unless the user specifically gives the
248 "mapped" keyword again. */
250 mapped_symbol_files
= 0;
251 flags
&= ~OBJF_MAPPED
;
254 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
256 /* If we don't support mapped symbol files, didn't ask for the file to be
257 mapped, or failed to open the mapped file for some reason, then revert
258 back to an unmapped objfile. */
262 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
263 memset (objfile
, 0, sizeof (struct objfile
));
265 obstack_specify_allocation (&objfile
->psymbol_cache
.cache
, 0, 0,
267 obstack_specify_allocation (&objfile
->psymbol_obstack
, 0, 0, xmalloc
,
269 obstack_specify_allocation (&objfile
->symbol_obstack
, 0, 0, xmalloc
,
271 obstack_specify_allocation (&objfile
->type_obstack
, 0, 0, xmalloc
,
273 flags
&= ~OBJF_MAPPED
;
276 /* Update the per-objfile information that comes from the bfd, ensuring
277 that any data that is reference is saved in the per-objfile data
280 objfile
->obfd
= abfd
;
281 if (objfile
->name
!= NULL
)
283 mfree (objfile
->md
, objfile
->name
);
287 objfile
->name
= mstrsave (objfile
->md
, bfd_get_filename (abfd
));
288 objfile
->mtime
= bfd_get_mtime (abfd
);
290 /* Build section table. */
292 if (build_objfile_section_table (objfile
))
294 error ("Can't find the file sections in `%s': %s",
295 objfile
->name
, bfd_errmsg (bfd_get_error ()));
299 /* Initialize the section indexes for this objfile, so that we can
300 later detect if they are used w/o being properly assigned to. */
302 objfile
->sect_index_text
= -1;
303 objfile
->sect_index_data
= -1;
304 objfile
->sect_index_bss
= -1;
305 objfile
->sect_index_rodata
= -1;
307 /* Add this file onto the tail of the linked list of other such files. */
309 objfile
->next
= NULL
;
310 if (object_files
== NULL
)
311 object_files
= objfile
;
314 for (last_one
= object_files
;
316 last_one
= last_one
->next
);
317 last_one
->next
= objfile
;
320 /* Save passed in flag bits. */
321 objfile
->flags
|= flags
;
326 /* Put OBJFILE at the front of the list. */
329 objfile_to_front (struct objfile
*objfile
)
331 struct objfile
**objp
;
332 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
334 if (*objp
== objfile
)
336 /* Unhook it from where it is. */
337 *objp
= objfile
->next
;
338 /* Put it in the front. */
339 objfile
->next
= object_files
;
340 object_files
= objfile
;
346 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
349 It is not a bug, or error, to call this function if OBJFILE is not known
350 to be in the current list. This is done in the case of mapped objfiles,
351 for example, just to ensure that the mapped objfile doesn't appear twice
352 in the list. Since the list is threaded, linking in a mapped objfile
353 twice would create a circular list.
355 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
356 unlinking it, just to ensure that we have completely severed any linkages
357 between the OBJFILE and the list. */
360 unlink_objfile (struct objfile
*objfile
)
362 struct objfile
**objpp
;
364 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
366 if (*objpp
== objfile
)
368 *objpp
= (*objpp
)->next
;
369 objfile
->next
= NULL
;
374 internal_error (__FILE__
, __LINE__
,
375 "unlink_objfile: objfile already unlinked");
379 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
380 that as much as possible is allocated on the symbol_obstack and
381 psymbol_obstack, so that the memory can be efficiently freed.
383 Things which we do NOT free because they are not in malloc'd memory
384 or not in memory specific to the objfile include:
388 FIXME: If the objfile is using reusable symbol information (via mmalloc),
389 then we need to take into account the fact that more than one process
390 may be using the symbol information at the same time (when mmalloc is
391 extended to support cooperative locking). When more than one process
392 is using the mapped symbol info, we need to be more careful about when
393 we free objects in the reusable area. */
396 free_objfile (struct objfile
*objfile
)
398 /* First do any symbol file specific actions required when we are
399 finished with a particular symbol file. Note that if the objfile
400 is using reusable symbol information (via mmalloc) then each of
401 these routines is responsible for doing the correct thing, either
402 freeing things which are valid only during this particular gdb
403 execution, or leaving them to be reused during the next one. */
405 if (objfile
->sf
!= NULL
)
407 (*objfile
->sf
->sym_finish
) (objfile
);
410 /* We always close the bfd. */
412 if (objfile
->obfd
!= NULL
)
414 char *name
= bfd_get_filename (objfile
->obfd
);
415 if (!bfd_close (objfile
->obfd
))
416 warning ("cannot close \"%s\": %s",
417 name
, bfd_errmsg (bfd_get_error ()));
421 /* Remove it from the chain of all objfiles. */
423 unlink_objfile (objfile
);
425 /* If we are going to free the runtime common objfile, mark it
428 if (objfile
== rt_common_objfile
)
429 rt_common_objfile
= NULL
;
431 /* Before the symbol table code was redone to make it easier to
432 selectively load and remove information particular to a specific
433 linkage unit, gdb used to do these things whenever the monolithic
434 symbol table was blown away. How much still needs to be done
435 is unknown, but we play it safe for now and keep each action until
436 it is shown to be no longer needed. */
438 /* I *think* all our callers call clear_symtab_users. If so, no need
439 to call this here. */
440 clear_pc_function_cache ();
442 /* The last thing we do is free the objfile struct itself for the
443 non-reusable case, or detach from the mapped file for the reusable
444 case. Note that the mmalloc_detach or the mfree is the last thing
445 we can do with this objfile. */
447 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
449 if (objfile
->flags
& OBJF_MAPPED
)
451 /* Remember the fd so we can close it. We can't close it before
452 doing the detach, and after the detach the objfile is gone. */
455 mmfd
= objfile
->mmfd
;
456 mmalloc_detach (objfile
->md
);
461 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
463 /* If we still have an objfile, then either we don't support reusable
464 objfiles or this one was not reusable. So free it normally. */
468 if (objfile
->name
!= NULL
)
470 mfree (objfile
->md
, objfile
->name
);
472 if (objfile
->global_psymbols
.list
)
473 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
474 if (objfile
->static_psymbols
.list
)
475 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
476 /* Free the obstacks for non-reusable objfiles */
477 free_bcache (&objfile
->psymbol_cache
);
478 obstack_free (&objfile
->psymbol_obstack
, 0);
479 obstack_free (&objfile
->symbol_obstack
, 0);
480 obstack_free (&objfile
->type_obstack
, 0);
481 mfree (objfile
->md
, objfile
);
487 do_free_objfile_cleanup (void *obj
)
493 make_cleanup_free_objfile (struct objfile
*obj
)
495 return make_cleanup (do_free_objfile_cleanup
, obj
);
498 /* Free all the object files at once and clean up their users. */
501 free_all_objfiles (void)
503 struct objfile
*objfile
, *temp
;
505 ALL_OBJFILES_SAFE (objfile
, temp
)
507 free_objfile (objfile
);
509 clear_symtab_users ();
512 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
513 entries in new_offsets. */
515 objfile_relocate (struct objfile
*objfile
, struct section_offsets
*new_offsets
)
517 struct section_offsets
*delta
=
518 (struct section_offsets
*) alloca (SIZEOF_SECTION_OFFSETS
);
522 int something_changed
= 0;
523 for (i
= 0; i
< objfile
->num_sections
; ++i
)
526 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
527 if (ANOFFSET (delta
, i
) != 0)
528 something_changed
= 1;
530 if (!something_changed
)
534 /* OK, get all the symtabs. */
538 ALL_OBJFILE_SYMTABS (objfile
, s
)
541 struct blockvector
*bv
;
544 /* First the line table. */
548 for (i
= 0; i
< l
->nitems
; ++i
)
549 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
552 /* Don't relocate a shared blockvector more than once. */
556 bv
= BLOCKVECTOR (s
);
557 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
563 b
= BLOCKVECTOR_BLOCK (bv
, i
);
564 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
565 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
567 ALL_BLOCK_SYMBOLS (b
, j
, sym
)
569 fixup_symbol_section (sym
, objfile
);
571 /* The RS6000 code from which this was taken skipped
572 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
573 But I'm leaving out that test, on the theory that
574 they can't possibly pass the tests below. */
575 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
576 || SYMBOL_CLASS (sym
) == LOC_STATIC
577 || SYMBOL_CLASS (sym
) == LOC_INDIRECT
)
578 && SYMBOL_SECTION (sym
) >= 0)
580 SYMBOL_VALUE_ADDRESS (sym
) +=
581 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
583 #ifdef MIPS_EFI_SYMBOL_NAME
584 /* Relocate Extra Function Info for ecoff. */
586 else if (SYMBOL_CLASS (sym
) == LOC_CONST
587 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
588 && strcmp (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
589 ecoff_relocate_efi (sym
, ANOFFSET (delta
,
590 s
->block_line_section
));
598 struct partial_symtab
*p
;
600 ALL_OBJFILE_PSYMTABS (objfile
, p
)
602 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
603 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
608 struct partial_symbol
**psym
;
610 for (psym
= objfile
->global_psymbols
.list
;
611 psym
< objfile
->global_psymbols
.next
;
614 fixup_psymbol_section (*psym
, objfile
);
615 if (SYMBOL_SECTION (*psym
) >= 0)
616 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
617 SYMBOL_SECTION (*psym
));
619 for (psym
= objfile
->static_psymbols
.list
;
620 psym
< objfile
->static_psymbols
.next
;
623 fixup_psymbol_section (*psym
, objfile
);
624 if (SYMBOL_SECTION (*psym
) >= 0)
625 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
626 SYMBOL_SECTION (*psym
));
631 struct minimal_symbol
*msym
;
632 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
633 if (SYMBOL_SECTION (msym
) >= 0)
634 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
636 /* Relocating different sections by different amounts may cause the symbols
637 to be out of order. */
638 msymbols_sort (objfile
);
642 for (i
= 0; i
< objfile
->num_sections
; ++i
)
643 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
646 if (objfile
->ei
.entry_point
!= ~(CORE_ADDR
) 0)
648 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
649 only as a fallback. */
650 struct obj_section
*s
;
651 s
= find_pc_section (objfile
->ei
.entry_point
);
653 objfile
->ei
.entry_point
+= ANOFFSET (delta
, s
->the_bfd_section
->index
);
655 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
659 struct obj_section
*s
;
662 abfd
= objfile
->obfd
;
664 ALL_OBJFILE_OSECTIONS (objfile
, s
)
666 int idx
= s
->the_bfd_section
->index
;
668 s
->addr
+= ANOFFSET (delta
, idx
);
669 s
->endaddr
+= ANOFFSET (delta
, idx
);
673 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
675 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
676 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
679 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
681 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
682 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
685 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
687 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
688 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
691 /* Relocate breakpoints as necessary, after things are relocated. */
692 breakpoint_re_set ();
695 /* Many places in gdb want to test just to see if we have any partial
696 symbols available. This function returns zero if none are currently
697 available, nonzero otherwise. */
700 have_partial_symbols (void)
706 if (ofp
->psymtabs
!= NULL
)
714 /* Many places in gdb want to test just to see if we have any full
715 symbols available. This function returns zero if none are currently
716 available, nonzero otherwise. */
719 have_full_symbols (void)
725 if (ofp
->symtabs
!= NULL
)
734 /* This operations deletes all objfile entries that represent solibs that
735 weren't explicitly loaded by the user, via e.g., the add-symbol-file
739 objfile_purge_solibs (void)
741 struct objfile
*objf
;
742 struct objfile
*temp
;
744 ALL_OBJFILES_SAFE (objf
, temp
)
746 /* We assume that the solib package has been purged already, or will
749 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
755 /* Many places in gdb want to test just to see if we have any minimal
756 symbols available. This function returns zero if none are currently
757 available, nonzero otherwise. */
760 have_minimal_symbols (void)
766 if (ofp
->msymbols
!= NULL
)
774 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
776 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
777 of the corresponding symbol file in MTIME, try to open an existing file
778 with the name SYMSFILENAME and verify it is more recent than the base
779 file by checking it's timestamp against MTIME.
781 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
783 If SYMSFILENAME does exist, but is out of date, we check to see if the
784 user has specified creation of a mapped file. If so, we don't issue
785 any warning message because we will be creating a new mapped file anyway,
786 overwriting the old one. If not, then we issue a warning message so that
787 the user will know why we aren't using this existing mapped symbol file.
788 In either case, we return -1.
790 If SYMSFILENAME does exist and is not out of date, but can't be opened for
791 some reason, then prints an appropriate system error message and returns -1.
793 Otherwise, returns the open file descriptor. */
796 open_existing_mapped_file (char *symsfilename
, long mtime
, int flags
)
801 if (stat (symsfilename
, &sbuf
) == 0)
803 if (sbuf
.st_mtime
< mtime
)
805 if (!(flags
& OBJF_MAPPED
))
807 warning ("mapped symbol file `%s' is out of date, ignored it",
811 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
815 printf_unfiltered (error_pre_print
);
817 print_sys_errmsg (symsfilename
, errno
);
823 /* Look for a mapped symbol file that corresponds to FILENAME and is more
824 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
825 use a mapped symbol file for this file, so create a new one if one does
828 If found, then return an open file descriptor for the file, otherwise
831 This routine is responsible for implementing the policy that generates
832 the name of the mapped symbol file from the name of a file containing
833 symbols that gdb would like to read. Currently this policy is to append
834 ".syms" to the name of the file.
836 This routine is also responsible for implementing the policy that
837 determines where the mapped symbol file is found (the search path).
838 This policy is that when reading an existing mapped file, a file of
839 the correct name in the current directory takes precedence over a
840 file of the correct name in the same directory as the symbol file.
841 When creating a new mapped file, it is always created in the current
842 directory. This helps to minimize the chances of a user unknowingly
843 creating big mapped files in places like /bin and /usr/local/bin, and
844 allows a local copy to override a manually installed global copy (in
845 /bin for example). */
848 open_mapped_file (char *filename
, long mtime
, int flags
)
853 /* First try to open an existing file in the current directory, and
854 then try the directory where the symbol file is located. */
856 symsfilename
= concat ("./", lbasename (filename
), ".syms", (char *) NULL
);
857 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, flags
)) < 0)
859 xfree (symsfilename
);
860 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
861 fd
= open_existing_mapped_file (symsfilename
, mtime
, flags
);
864 /* If we don't have an open file by now, then either the file does not
865 already exist, or the base file has changed since it was created. In
866 either case, if the user has specified use of a mapped file, then
867 create a new mapped file, truncating any existing one. If we can't
868 create one, print a system error message saying why we can't.
870 By default the file is rw for everyone, with the user's umask taking
871 care of turning off the permissions the user wants off. */
873 if ((fd
< 0) && (flags
& OBJF_MAPPED
))
875 xfree (symsfilename
);
876 symsfilename
= concat ("./", lbasename (filename
), ".syms",
878 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
882 printf_unfiltered (error_pre_print
);
884 print_sys_errmsg (symsfilename
, errno
);
888 xfree (symsfilename
);
898 md
= mmalloc_attach (fd
, (PTR
) 0);
901 mapto
= (CORE_ADDR
) mmalloc_getkey (md
, 1);
902 md
= mmalloc_detach (md
);
905 /* FIXME: should figure out why detach failed */
908 else if (mapto
!= (CORE_ADDR
) NULL
)
910 /* This mapping file needs to be remapped at "mapto" */
911 md
= mmalloc_attach (fd
, (PTR
) mapto
);
915 /* This is a freshly created mapping file. */
916 mapto
= (CORE_ADDR
) mmalloc_findbase (20 * 1024 * 1024);
919 /* To avoid reusing the freshly created mapping file, at the
920 address selected by mmap, we must truncate it before trying
921 to do an attach at the address we want. */
923 md
= mmalloc_attach (fd
, (PTR
) mapto
);
926 mmalloc_setkey (md
, 1, (PTR
) mapto
);
934 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
936 /* Returns a section whose range includes PC and SECTION,
937 or NULL if none found. Note the distinction between the return type,
938 struct obj_section (which is defined in gdb), and the input type
939 struct sec (which is a bfd-defined data type). The obj_section
940 contains a pointer to the bfd struct sec section. */
943 find_pc_sect_section (CORE_ADDR pc
, struct sec
*section
)
945 struct obj_section
*s
;
946 struct objfile
*objfile
;
948 ALL_OBJSECTIONS (objfile
, s
)
949 if ((section
== 0 || section
== s
->the_bfd_section
) &&
950 s
->addr
<= pc
&& pc
< s
->endaddr
)
956 /* Returns a section whose range includes PC or NULL if none found.
957 Backward compatibility, no section. */
960 find_pc_section (CORE_ADDR pc
)
962 return find_pc_sect_section (pc
, find_pc_mapped_section (pc
));
966 /* In SVR4, we recognize a trampoline by it's section name.
967 That is, if the pc is in a section named ".plt" then we are in
971 in_plt_section (CORE_ADDR pc
, char *name
)
973 struct obj_section
*s
;
976 s
= find_pc_section (pc
);
979 && s
->the_bfd_section
->name
!= NULL
980 && STREQ (s
->the_bfd_section
->name
, ".plt"));
984 /* Return nonzero if NAME is in the import list of OBJFILE. Else
988 is_in_import_list (char *name
, struct objfile
*objfile
)
992 if (!objfile
|| !name
|| !*name
)
995 for (i
= 0; i
< objfile
->import_list_size
; i
++)
996 if (objfile
->import_list
[i
] && STREQ (name
, objfile
->import_list
[i
]))
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