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
)
562 b
= BLOCKVECTOR_BLOCK (bv
, i
);
563 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
564 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
566 for (j
= 0; j
< BLOCK_NSYMS (b
); ++j
)
568 struct symbol
*sym
= BLOCK_SYM (b
, j
);
570 fixup_symbol_section (sym
, objfile
);
572 /* The RS6000 code from which this was taken skipped
573 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
574 But I'm leaving out that test, on the theory that
575 they can't possibly pass the tests below. */
576 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
577 || SYMBOL_CLASS (sym
) == LOC_STATIC
578 || SYMBOL_CLASS (sym
) == LOC_INDIRECT
)
579 && SYMBOL_SECTION (sym
) >= 0)
581 SYMBOL_VALUE_ADDRESS (sym
) +=
582 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
584 #ifdef MIPS_EFI_SYMBOL_NAME
585 /* Relocate Extra Function Info for ecoff. */
587 else if (SYMBOL_CLASS (sym
) == LOC_CONST
588 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
589 && strcmp (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
590 ecoff_relocate_efi (sym
, ANOFFSET (delta
,
591 s
->block_line_section
));
599 struct partial_symtab
*p
;
601 ALL_OBJFILE_PSYMTABS (objfile
, p
)
603 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
604 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
609 struct partial_symbol
**psym
;
611 for (psym
= objfile
->global_psymbols
.list
;
612 psym
< objfile
->global_psymbols
.next
;
615 fixup_psymbol_section (*psym
, objfile
);
616 if (SYMBOL_SECTION (*psym
) >= 0)
617 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
618 SYMBOL_SECTION (*psym
));
620 for (psym
= objfile
->static_psymbols
.list
;
621 psym
< objfile
->static_psymbols
.next
;
624 fixup_psymbol_section (*psym
, objfile
);
625 if (SYMBOL_SECTION (*psym
) >= 0)
626 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
627 SYMBOL_SECTION (*psym
));
632 struct minimal_symbol
*msym
;
633 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
634 if (SYMBOL_SECTION (msym
) >= 0)
635 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
637 /* Relocating different sections by different amounts may cause the symbols
638 to be out of order. */
639 msymbols_sort (objfile
);
643 for (i
= 0; i
< objfile
->num_sections
; ++i
)
644 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
647 if (objfile
->ei
.entry_point
!= ~(CORE_ADDR
) 0)
649 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
650 only as a fallback. */
651 struct obj_section
*s
;
652 s
= find_pc_section (objfile
->ei
.entry_point
);
654 objfile
->ei
.entry_point
+= ANOFFSET (delta
, s
->the_bfd_section
->index
);
656 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
660 struct obj_section
*s
;
663 abfd
= objfile
->obfd
;
665 ALL_OBJFILE_OSECTIONS (objfile
, s
)
667 int idx
= s
->the_bfd_section
->index
;
669 s
->addr
+= ANOFFSET (delta
, idx
);
670 s
->endaddr
+= ANOFFSET (delta
, idx
);
674 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
676 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
677 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
680 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
682 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
683 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
686 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
688 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
689 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
692 /* Relocate breakpoints as necessary, after things are relocated. */
693 breakpoint_re_set ();
696 /* Many places in gdb want to test just to see if we have any partial
697 symbols available. This function returns zero if none are currently
698 available, nonzero otherwise. */
701 have_partial_symbols (void)
707 if (ofp
->psymtabs
!= NULL
)
715 /* Many places in gdb want to test just to see if we have any full
716 symbols available. This function returns zero if none are currently
717 available, nonzero otherwise. */
720 have_full_symbols (void)
726 if (ofp
->symtabs
!= NULL
)
735 /* This operations deletes all objfile entries that represent solibs that
736 weren't explicitly loaded by the user, via e.g., the add-symbol-file
740 objfile_purge_solibs (void)
742 struct objfile
*objf
;
743 struct objfile
*temp
;
745 ALL_OBJFILES_SAFE (objf
, temp
)
747 /* We assume that the solib package has been purged already, or will
750 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
756 /* Many places in gdb want to test just to see if we have any minimal
757 symbols available. This function returns zero if none are currently
758 available, nonzero otherwise. */
761 have_minimal_symbols (void)
767 if (ofp
->msymbols
!= NULL
)
775 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
777 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
778 of the corresponding symbol file in MTIME, try to open an existing file
779 with the name SYMSFILENAME and verify it is more recent than the base
780 file by checking it's timestamp against MTIME.
782 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
784 If SYMSFILENAME does exist, but is out of date, we check to see if the
785 user has specified creation of a mapped file. If so, we don't issue
786 any warning message because we will be creating a new mapped file anyway,
787 overwriting the old one. If not, then we issue a warning message so that
788 the user will know why we aren't using this existing mapped symbol file.
789 In either case, we return -1.
791 If SYMSFILENAME does exist and is not out of date, but can't be opened for
792 some reason, then prints an appropriate system error message and returns -1.
794 Otherwise, returns the open file descriptor. */
797 open_existing_mapped_file (char *symsfilename
, long mtime
, int flags
)
802 if (stat (symsfilename
, &sbuf
) == 0)
804 if (sbuf
.st_mtime
< mtime
)
806 if (!(flags
& OBJF_MAPPED
))
808 warning ("mapped symbol file `%s' is out of date, ignored it",
812 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
816 printf_unfiltered (error_pre_print
);
818 print_sys_errmsg (symsfilename
, errno
);
824 /* Look for a mapped symbol file that corresponds to FILENAME and is more
825 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
826 use a mapped symbol file for this file, so create a new one if one does
829 If found, then return an open file descriptor for the file, otherwise
832 This routine is responsible for implementing the policy that generates
833 the name of the mapped symbol file from the name of a file containing
834 symbols that gdb would like to read. Currently this policy is to append
835 ".syms" to the name of the file.
837 This routine is also responsible for implementing the policy that
838 determines where the mapped symbol file is found (the search path).
839 This policy is that when reading an existing mapped file, a file of
840 the correct name in the current directory takes precedence over a
841 file of the correct name in the same directory as the symbol file.
842 When creating a new mapped file, it is always created in the current
843 directory. This helps to minimize the chances of a user unknowingly
844 creating big mapped files in places like /bin and /usr/local/bin, and
845 allows a local copy to override a manually installed global copy (in
846 /bin for example). */
849 open_mapped_file (char *filename
, long mtime
, int flags
)
854 /* First try to open an existing file in the current directory, and
855 then try the directory where the symbol file is located. */
857 symsfilename
= concat ("./", lbasename (filename
), ".syms", (char *) NULL
);
858 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, flags
)) < 0)
860 xfree (symsfilename
);
861 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
862 fd
= open_existing_mapped_file (symsfilename
, mtime
, flags
);
865 /* If we don't have an open file by now, then either the file does not
866 already exist, or the base file has changed since it was created. In
867 either case, if the user has specified use of a mapped file, then
868 create a new mapped file, truncating any existing one. If we can't
869 create one, print a system error message saying why we can't.
871 By default the file is rw for everyone, with the user's umask taking
872 care of turning off the permissions the user wants off. */
874 if ((fd
< 0) && (flags
& OBJF_MAPPED
))
876 xfree (symsfilename
);
877 symsfilename
= concat ("./", lbasename (filename
), ".syms",
879 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
883 printf_unfiltered (error_pre_print
);
885 print_sys_errmsg (symsfilename
, errno
);
889 xfree (symsfilename
);
899 md
= mmalloc_attach (fd
, (PTR
) 0);
902 mapto
= (CORE_ADDR
) mmalloc_getkey (md
, 1);
903 md
= mmalloc_detach (md
);
906 /* FIXME: should figure out why detach failed */
909 else if (mapto
!= (CORE_ADDR
) NULL
)
911 /* This mapping file needs to be remapped at "mapto" */
912 md
= mmalloc_attach (fd
, (PTR
) mapto
);
916 /* This is a freshly created mapping file. */
917 mapto
= (CORE_ADDR
) mmalloc_findbase (20 * 1024 * 1024);
920 /* To avoid reusing the freshly created mapping file, at the
921 address selected by mmap, we must truncate it before trying
922 to do an attach at the address we want. */
924 md
= mmalloc_attach (fd
, (PTR
) mapto
);
927 mmalloc_setkey (md
, 1, (PTR
) mapto
);
935 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
937 /* Returns a section whose range includes PC and SECTION,
938 or NULL if none found. Note the distinction between the return type,
939 struct obj_section (which is defined in gdb), and the input type
940 struct sec (which is a bfd-defined data type). The obj_section
941 contains a pointer to the bfd struct sec section. */
944 find_pc_sect_section (CORE_ADDR pc
, struct sec
*section
)
946 struct obj_section
*s
;
947 struct objfile
*objfile
;
949 ALL_OBJSECTIONS (objfile
, s
)
950 if ((section
== 0 || section
== s
->the_bfd_section
) &&
951 s
->addr
<= pc
&& pc
< s
->endaddr
)
957 /* Returns a section whose range includes PC or NULL if none found.
958 Backward compatibility, no section. */
961 find_pc_section (CORE_ADDR pc
)
963 return find_pc_sect_section (pc
, find_pc_mapped_section (pc
));
967 /* In SVR4, we recognize a trampoline by it's section name.
968 That is, if the pc is in a section named ".plt" then we are in
972 in_plt_section (CORE_ADDR pc
, char *name
)
974 struct obj_section
*s
;
977 s
= find_pc_section (pc
);
980 && s
->the_bfd_section
->name
!= NULL
981 && STREQ (s
->the_bfd_section
->name
, ".plt"));
985 /* Return nonzero if NAME is in the import list of OBJFILE. Else
989 is_in_import_list (char *name
, struct objfile
*objfile
)
993 if (!objfile
|| !name
|| !*name
)
996 for (i
= 0; i
< objfile
->import_list_size
; i
++)
997 if (objfile
->import_list
[i
] && STREQ (name
, objfile
->import_list
[i
]))
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