1 /* Generic symbol file reading for the GNU debugger, GDB.
3 Copyright (C) 1990-2012 Free Software Foundation, Inc.
5 Contributed by Cygnus Support, using pieces from other GDB modules.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "arch-utils.h"
35 #include "breakpoint.h"
37 #include "complaints.h"
41 #include "filenames.h" /* for DOSish file names */
42 #include "gdb-stabs.h"
43 #include "gdb_obstack.h"
44 #include "completer.h"
47 #include "readline/readline.h"
48 #include "gdb_assert.h"
52 #include "parser-defs.h"
59 #include <sys/types.h>
61 #include "gdb_string.h"
69 int (*deprecated_ui_load_progress_hook
) (const char *section
,
71 void (*deprecated_show_load_progress
) (const char *section
,
72 unsigned long section_sent
,
73 unsigned long section_size
,
74 unsigned long total_sent
,
75 unsigned long total_size
);
76 void (*deprecated_pre_add_symbol_hook
) (const char *);
77 void (*deprecated_post_add_symbol_hook
) (void);
79 static void clear_symtab_users_cleanup (void *ignore
);
81 /* Global variables owned by this file. */
82 int readnow_symbol_files
; /* Read full symbols immediately. */
84 /* External variables and functions referenced. */
86 extern void report_transfer_performance (unsigned long, time_t, time_t);
88 /* Functions this file defines. */
90 static void load_command (char *, int);
92 static void symbol_file_add_main_1 (char *args
, int from_tty
, int flags
);
94 static void add_symbol_file_command (char *, int);
96 bfd
*symfile_bfd_open (char *);
98 int get_section_index (struct objfile
*, char *);
100 static const struct sym_fns
*find_sym_fns (bfd
*);
102 static void decrement_reading_symtab (void *);
104 static void overlay_invalidate_all (void);
106 void list_overlays_command (char *, int);
108 void map_overlay_command (char *, int);
110 void unmap_overlay_command (char *, int);
112 static void overlay_auto_command (char *, int);
114 static void overlay_manual_command (char *, int);
116 static void overlay_off_command (char *, int);
118 static void overlay_load_command (char *, int);
120 static void overlay_command (char *, int);
122 static void simple_free_overlay_table (void);
124 static void read_target_long_array (CORE_ADDR
, unsigned int *, int, int,
127 static int simple_read_overlay_table (void);
129 static int simple_overlay_update_1 (struct obj_section
*);
131 static void add_filename_language (char *ext
, enum language lang
);
133 static void info_ext_lang_command (char *args
, int from_tty
);
135 static void init_filename_language_table (void);
137 static void symfile_find_segment_sections (struct objfile
*objfile
);
139 void _initialize_symfile (void);
141 /* List of all available sym_fns. On gdb startup, each object file reader
142 calls add_symtab_fns() to register information on each format it is
145 typedef const struct sym_fns
*sym_fns_ptr
;
146 DEF_VEC_P (sym_fns_ptr
);
148 static VEC (sym_fns_ptr
) *symtab_fns
= NULL
;
150 /* Flag for whether user will be reloading symbols multiple times.
151 Defaults to ON for VxWorks, otherwise OFF. */
153 #ifdef SYMBOL_RELOADING_DEFAULT
154 int symbol_reloading
= SYMBOL_RELOADING_DEFAULT
;
156 int symbol_reloading
= 0;
159 show_symbol_reloading (struct ui_file
*file
, int from_tty
,
160 struct cmd_list_element
*c
, const char *value
)
162 fprintf_filtered (file
, _("Dynamic symbol table reloading "
163 "multiple times in one run is %s.\n"),
167 /* If non-zero, shared library symbols will be added automatically
168 when the inferior is created, new libraries are loaded, or when
169 attaching to the inferior. This is almost always what users will
170 want to have happen; but for very large programs, the startup time
171 will be excessive, and so if this is a problem, the user can clear
172 this flag and then add the shared library symbols as needed. Note
173 that there is a potential for confusion, since if the shared
174 library symbols are not loaded, commands like "info fun" will *not*
175 report all the functions that are actually present. */
177 int auto_solib_add
= 1;
180 /* Make a null terminated copy of the string at PTR with SIZE characters in
181 the obstack pointed to by OBSTACKP . Returns the address of the copy.
182 Note that the string at PTR does not have to be null terminated, I.e. it
183 may be part of a larger string and we are only saving a substring. */
186 obsavestring (const char *ptr
, int size
, struct obstack
*obstackp
)
188 char *p
= (char *) obstack_alloc (obstackp
, size
+ 1);
189 /* Open-coded memcpy--saves function call time. These strings are usually
190 short. FIXME: Is this really still true with a compiler that can
193 const char *p1
= ptr
;
195 const char *end
= ptr
+ size
;
204 /* Concatenate NULL terminated variable argument list of `const char *'
205 strings; return the new string. Space is found in the OBSTACKP.
206 Argument list must be terminated by a sentinel expression `(char *)
210 obconcat (struct obstack
*obstackp
, ...)
214 va_start (ap
, obstackp
);
217 const char *s
= va_arg (ap
, const char *);
222 obstack_grow_str (obstackp
, s
);
225 obstack_1grow (obstackp
, 0);
227 return obstack_finish (obstackp
);
230 /* True if we are reading a symbol table. */
232 int currently_reading_symtab
= 0;
235 decrement_reading_symtab (void *dummy
)
237 currently_reading_symtab
--;
240 /* Increment currently_reading_symtab and return a cleanup that can be
241 used to decrement it. */
243 increment_reading_symtab (void)
245 ++currently_reading_symtab
;
246 return make_cleanup (decrement_reading_symtab
, NULL
);
249 /* Remember the lowest-addressed loadable section we've seen.
250 This function is called via bfd_map_over_sections.
252 In case of equal vmas, the section with the largest size becomes the
253 lowest-addressed loadable section.
255 If the vmas and sizes are equal, the last section is considered the
256 lowest-addressed loadable section. */
259 find_lowest_section (bfd
*abfd
, asection
*sect
, void *obj
)
261 asection
**lowest
= (asection
**) obj
;
263 if (0 == (bfd_get_section_flags (abfd
, sect
) & (SEC_ALLOC
| SEC_LOAD
)))
266 *lowest
= sect
; /* First loadable section */
267 else if (bfd_section_vma (abfd
, *lowest
) > bfd_section_vma (abfd
, sect
))
268 *lowest
= sect
; /* A lower loadable section */
269 else if (bfd_section_vma (abfd
, *lowest
) == bfd_section_vma (abfd
, sect
)
270 && (bfd_section_size (abfd
, (*lowest
))
271 <= bfd_section_size (abfd
, sect
)))
275 /* Create a new section_addr_info, with room for NUM_SECTIONS. */
277 struct section_addr_info
*
278 alloc_section_addr_info (size_t num_sections
)
280 struct section_addr_info
*sap
;
283 size
= (sizeof (struct section_addr_info
)
284 + sizeof (struct other_sections
) * (num_sections
- 1));
285 sap
= (struct section_addr_info
*) xmalloc (size
);
286 memset (sap
, 0, size
);
287 sap
->num_sections
= num_sections
;
292 /* Build (allocate and populate) a section_addr_info struct from
293 an existing section table. */
295 extern struct section_addr_info
*
296 build_section_addr_info_from_section_table (const struct target_section
*start
,
297 const struct target_section
*end
)
299 struct section_addr_info
*sap
;
300 const struct target_section
*stp
;
303 sap
= alloc_section_addr_info (end
- start
);
305 for (stp
= start
, oidx
= 0; stp
!= end
; stp
++)
307 if (bfd_get_section_flags (stp
->bfd
,
308 stp
->the_bfd_section
) & (SEC_ALLOC
| SEC_LOAD
)
309 && oidx
< end
- start
)
311 sap
->other
[oidx
].addr
= stp
->addr
;
312 sap
->other
[oidx
].name
313 = xstrdup (bfd_section_name (stp
->bfd
, stp
->the_bfd_section
));
314 sap
->other
[oidx
].sectindex
= stp
->the_bfd_section
->index
;
322 /* Create a section_addr_info from section offsets in ABFD. */
324 static struct section_addr_info
*
325 build_section_addr_info_from_bfd (bfd
*abfd
)
327 struct section_addr_info
*sap
;
329 struct bfd_section
*sec
;
331 sap
= alloc_section_addr_info (bfd_count_sections (abfd
));
332 for (i
= 0, sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
333 if (bfd_get_section_flags (abfd
, sec
) & (SEC_ALLOC
| SEC_LOAD
))
335 sap
->other
[i
].addr
= bfd_get_section_vma (abfd
, sec
);
336 sap
->other
[i
].name
= xstrdup (bfd_get_section_name (abfd
, sec
));
337 sap
->other
[i
].sectindex
= sec
->index
;
343 /* Create a section_addr_info from section offsets in OBJFILE. */
345 struct section_addr_info
*
346 build_section_addr_info_from_objfile (const struct objfile
*objfile
)
348 struct section_addr_info
*sap
;
351 /* Before reread_symbols gets rewritten it is not safe to call:
352 gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd));
354 sap
= build_section_addr_info_from_bfd (objfile
->obfd
);
355 for (i
= 0; i
< sap
->num_sections
&& sap
->other
[i
].name
; i
++)
357 int sectindex
= sap
->other
[i
].sectindex
;
359 sap
->other
[i
].addr
+= objfile
->section_offsets
->offsets
[sectindex
];
364 /* Free all memory allocated by build_section_addr_info_from_section_table. */
367 free_section_addr_info (struct section_addr_info
*sap
)
371 for (idx
= 0; idx
< sap
->num_sections
; idx
++)
372 if (sap
->other
[idx
].name
)
373 xfree (sap
->other
[idx
].name
);
378 /* Initialize OBJFILE's sect_index_* members. */
380 init_objfile_sect_indices (struct objfile
*objfile
)
385 sect
= bfd_get_section_by_name (objfile
->obfd
, ".text");
387 objfile
->sect_index_text
= sect
->index
;
389 sect
= bfd_get_section_by_name (objfile
->obfd
, ".data");
391 objfile
->sect_index_data
= sect
->index
;
393 sect
= bfd_get_section_by_name (objfile
->obfd
, ".bss");
395 objfile
->sect_index_bss
= sect
->index
;
397 sect
= bfd_get_section_by_name (objfile
->obfd
, ".rodata");
399 objfile
->sect_index_rodata
= sect
->index
;
401 /* This is where things get really weird... We MUST have valid
402 indices for the various sect_index_* members or gdb will abort.
403 So if for example, there is no ".text" section, we have to
404 accomodate that. First, check for a file with the standard
405 one or two segments. */
407 symfile_find_segment_sections (objfile
);
409 /* Except when explicitly adding symbol files at some address,
410 section_offsets contains nothing but zeros, so it doesn't matter
411 which slot in section_offsets the individual sect_index_* members
412 index into. So if they are all zero, it is safe to just point
413 all the currently uninitialized indices to the first slot. But
414 beware: if this is the main executable, it may be relocated
415 later, e.g. by the remote qOffsets packet, and then this will
416 be wrong! That's why we try segments first. */
418 for (i
= 0; i
< objfile
->num_sections
; i
++)
420 if (ANOFFSET (objfile
->section_offsets
, i
) != 0)
425 if (i
== objfile
->num_sections
)
427 if (objfile
->sect_index_text
== -1)
428 objfile
->sect_index_text
= 0;
429 if (objfile
->sect_index_data
== -1)
430 objfile
->sect_index_data
= 0;
431 if (objfile
->sect_index_bss
== -1)
432 objfile
->sect_index_bss
= 0;
433 if (objfile
->sect_index_rodata
== -1)
434 objfile
->sect_index_rodata
= 0;
438 /* The arguments to place_section. */
440 struct place_section_arg
442 struct section_offsets
*offsets
;
446 /* Find a unique offset to use for loadable section SECT if
447 the user did not provide an offset. */
450 place_section (bfd
*abfd
, asection
*sect
, void *obj
)
452 struct place_section_arg
*arg
= obj
;
453 CORE_ADDR
*offsets
= arg
->offsets
->offsets
, start_addr
;
455 ULONGEST align
= ((ULONGEST
) 1) << bfd_get_section_alignment (abfd
, sect
);
457 /* We are only interested in allocated sections. */
458 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
461 /* If the user specified an offset, honor it. */
462 if (offsets
[sect
->index
] != 0)
465 /* Otherwise, let's try to find a place for the section. */
466 start_addr
= (arg
->lowest
+ align
- 1) & -align
;
473 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
; cur_sec
= cur_sec
->next
)
475 int indx
= cur_sec
->index
;
477 /* We don't need to compare against ourself. */
481 /* We can only conflict with allocated sections. */
482 if ((bfd_get_section_flags (abfd
, cur_sec
) & SEC_ALLOC
) == 0)
485 /* If the section offset is 0, either the section has not been placed
486 yet, or it was the lowest section placed (in which case LOWEST
487 will be past its end). */
488 if (offsets
[indx
] == 0)
491 /* If this section would overlap us, then we must move up. */
492 if (start_addr
+ bfd_get_section_size (sect
) > offsets
[indx
]
493 && start_addr
< offsets
[indx
] + bfd_get_section_size (cur_sec
))
495 start_addr
= offsets
[indx
] + bfd_get_section_size (cur_sec
);
496 start_addr
= (start_addr
+ align
- 1) & -align
;
501 /* Otherwise, we appear to be OK. So far. */
506 offsets
[sect
->index
] = start_addr
;
507 arg
->lowest
= start_addr
+ bfd_get_section_size (sect
);
510 /* Store struct section_addr_info as prepared (made relative and with SECTINDEX
511 filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS
515 relative_addr_info_to_section_offsets (struct section_offsets
*section_offsets
,
517 struct section_addr_info
*addrs
)
521 memset (section_offsets
, 0, SIZEOF_N_SECTION_OFFSETS (num_sections
));
523 /* Now calculate offsets for section that were specified by the caller. */
524 for (i
= 0; i
< addrs
->num_sections
&& addrs
->other
[i
].name
; i
++)
526 struct other_sections
*osp
;
528 osp
= &addrs
->other
[i
];
529 if (osp
->sectindex
== -1)
532 /* Record all sections in offsets. */
533 /* The section_offsets in the objfile are here filled in using
535 section_offsets
->offsets
[osp
->sectindex
] = osp
->addr
;
539 /* Transform section name S for a name comparison. prelink can split section
540 `.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly
541 prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address
542 of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss'
543 (`.sbss') section has invalid (increased) virtual address. */
546 addr_section_name (const char *s
)
548 if (strcmp (s
, ".dynbss") == 0)
550 if (strcmp (s
, ".sdynbss") == 0)
556 /* qsort comparator for addrs_section_sort. Sort entries in ascending order by
557 their (name, sectindex) pair. sectindex makes the sort by name stable. */
560 addrs_section_compar (const void *ap
, const void *bp
)
562 const struct other_sections
*a
= *((struct other_sections
**) ap
);
563 const struct other_sections
*b
= *((struct other_sections
**) bp
);
564 int retval
, a_idx
, b_idx
;
566 retval
= strcmp (addr_section_name (a
->name
), addr_section_name (b
->name
));
570 return a
->sectindex
- b
->sectindex
;
573 /* Provide sorted array of pointers to sections of ADDRS. The array is
574 terminated by NULL. Caller is responsible to call xfree for it. */
576 static struct other_sections
**
577 addrs_section_sort (struct section_addr_info
*addrs
)
579 struct other_sections
**array
;
582 /* `+ 1' for the NULL terminator. */
583 array
= xmalloc (sizeof (*array
) * (addrs
->num_sections
+ 1));
584 for (i
= 0; i
< addrs
->num_sections
&& addrs
->other
[i
].name
; i
++)
585 array
[i
] = &addrs
->other
[i
];
588 qsort (array
, i
, sizeof (*array
), addrs_section_compar
);
593 /* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in
594 also SECTINDEXes specific to ABFD there. This function can be used to
595 rebase ADDRS to start referencing different BFD than before. */
598 addr_info_make_relative (struct section_addr_info
*addrs
, bfd
*abfd
)
600 asection
*lower_sect
;
601 CORE_ADDR lower_offset
;
603 struct cleanup
*my_cleanup
;
604 struct section_addr_info
*abfd_addrs
;
605 struct other_sections
**addrs_sorted
, **abfd_addrs_sorted
;
606 struct other_sections
**addrs_to_abfd_addrs
;
608 /* Find lowest loadable section to be used as starting point for
609 continguous sections. */
611 bfd_map_over_sections (abfd
, find_lowest_section
, &lower_sect
);
612 if (lower_sect
== NULL
)
614 warning (_("no loadable sections found in added symbol-file %s"),
615 bfd_get_filename (abfd
));
619 lower_offset
= bfd_section_vma (bfd_get_filename (abfd
), lower_sect
);
621 /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections
622 in ABFD. Section names are not unique - there can be multiple sections of
623 the same name. Also the sections of the same name do not have to be
624 adjacent to each other. Some sections may be present only in one of the
625 files. Even sections present in both files do not have to be in the same
628 Use stable sort by name for the sections in both files. Then linearly
629 scan both lists matching as most of the entries as possible. */
631 addrs_sorted
= addrs_section_sort (addrs
);
632 my_cleanup
= make_cleanup (xfree
, addrs_sorted
);
634 abfd_addrs
= build_section_addr_info_from_bfd (abfd
);
635 make_cleanup_free_section_addr_info (abfd_addrs
);
636 abfd_addrs_sorted
= addrs_section_sort (abfd_addrs
);
637 make_cleanup (xfree
, abfd_addrs_sorted
);
639 /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and
640 ABFD_ADDRS_SORTED. */
642 addrs_to_abfd_addrs
= xzalloc (sizeof (*addrs_to_abfd_addrs
)
643 * addrs
->num_sections
);
644 make_cleanup (xfree
, addrs_to_abfd_addrs
);
646 while (*addrs_sorted
)
648 const char *sect_name
= addr_section_name ((*addrs_sorted
)->name
);
650 while (*abfd_addrs_sorted
651 && strcmp (addr_section_name ((*abfd_addrs_sorted
)->name
),
655 if (*abfd_addrs_sorted
656 && strcmp (addr_section_name ((*abfd_addrs_sorted
)->name
),
661 /* Make the found item directly addressable from ADDRS. */
662 index_in_addrs
= *addrs_sorted
- addrs
->other
;
663 gdb_assert (addrs_to_abfd_addrs
[index_in_addrs
] == NULL
);
664 addrs_to_abfd_addrs
[index_in_addrs
] = *abfd_addrs_sorted
;
666 /* Never use the same ABFD entry twice. */
673 /* Calculate offsets for the loadable sections.
674 FIXME! Sections must be in order of increasing loadable section
675 so that contiguous sections can use the lower-offset!!!
677 Adjust offsets if the segments are not contiguous.
678 If the section is contiguous, its offset should be set to
679 the offset of the highest loadable section lower than it
680 (the loadable section directly below it in memory).
681 this_offset = lower_offset = lower_addr - lower_orig_addr */
683 for (i
= 0; i
< addrs
->num_sections
&& addrs
->other
[i
].name
; i
++)
685 struct other_sections
*sect
= addrs_to_abfd_addrs
[i
];
689 /* This is the index used by BFD. */
690 addrs
->other
[i
].sectindex
= sect
->sectindex
;
692 if (addrs
->other
[i
].addr
!= 0)
694 addrs
->other
[i
].addr
-= sect
->addr
;
695 lower_offset
= addrs
->other
[i
].addr
;
698 addrs
->other
[i
].addr
= lower_offset
;
702 /* addr_section_name transformation is not used for SECT_NAME. */
703 const char *sect_name
= addrs
->other
[i
].name
;
705 /* This section does not exist in ABFD, which is normally
706 unexpected and we want to issue a warning.
708 However, the ELF prelinker does create a few sections which are
709 marked in the main executable as loadable (they are loaded in
710 memory from the DYNAMIC segment) and yet are not present in
711 separate debug info files. This is fine, and should not cause
712 a warning. Shared libraries contain just the section
713 ".gnu.liblist" but it is not marked as loadable there. There is
714 no other way to identify them than by their name as the sections
715 created by prelink have no special flags.
717 For the sections `.bss' and `.sbss' see addr_section_name. */
719 if (!(strcmp (sect_name
, ".gnu.liblist") == 0
720 || strcmp (sect_name
, ".gnu.conflict") == 0
721 || (strcmp (sect_name
, ".bss") == 0
723 && strcmp (addrs
->other
[i
- 1].name
, ".dynbss") == 0
724 && addrs_to_abfd_addrs
[i
- 1] != NULL
)
725 || (strcmp (sect_name
, ".sbss") == 0
727 && strcmp (addrs
->other
[i
- 1].name
, ".sdynbss") == 0
728 && addrs_to_abfd_addrs
[i
- 1] != NULL
)))
729 warning (_("section %s not found in %s"), sect_name
,
730 bfd_get_filename (abfd
));
732 addrs
->other
[i
].addr
= 0;
733 addrs
->other
[i
].sectindex
= -1;
737 do_cleanups (my_cleanup
);
740 /* Parse the user's idea of an offset for dynamic linking, into our idea
741 of how to represent it for fast symbol reading. This is the default
742 version of the sym_fns.sym_offsets function for symbol readers that
743 don't need to do anything special. It allocates a section_offsets table
744 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
747 default_symfile_offsets (struct objfile
*objfile
,
748 struct section_addr_info
*addrs
)
750 objfile
->num_sections
= bfd_count_sections (objfile
->obfd
);
751 objfile
->section_offsets
= (struct section_offsets
*)
752 obstack_alloc (&objfile
->objfile_obstack
,
753 SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
));
754 relative_addr_info_to_section_offsets (objfile
->section_offsets
,
755 objfile
->num_sections
, addrs
);
757 /* For relocatable files, all loadable sections will start at zero.
758 The zero is meaningless, so try to pick arbitrary addresses such
759 that no loadable sections overlap. This algorithm is quadratic,
760 but the number of sections in a single object file is generally
762 if ((bfd_get_file_flags (objfile
->obfd
) & (EXEC_P
| DYNAMIC
)) == 0)
764 struct place_section_arg arg
;
765 bfd
*abfd
= objfile
->obfd
;
768 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
; cur_sec
= cur_sec
->next
)
769 /* We do not expect this to happen; just skip this step if the
770 relocatable file has a section with an assigned VMA. */
771 if (bfd_section_vma (abfd
, cur_sec
) != 0)
776 CORE_ADDR
*offsets
= objfile
->section_offsets
->offsets
;
778 /* Pick non-overlapping offsets for sections the user did not
780 arg
.offsets
= objfile
->section_offsets
;
782 bfd_map_over_sections (objfile
->obfd
, place_section
, &arg
);
784 /* Correctly filling in the section offsets is not quite
785 enough. Relocatable files have two properties that
786 (most) shared objects do not:
788 - Their debug information will contain relocations. Some
789 shared libraries do also, but many do not, so this can not
792 - If there are multiple code sections they will be loaded
793 at different relative addresses in memory than they are
794 in the objfile, since all sections in the file will start
797 Because GDB has very limited ability to map from an
798 address in debug info to the correct code section,
799 it relies on adding SECT_OFF_TEXT to things which might be
800 code. If we clear all the section offsets, and set the
801 section VMAs instead, then symfile_relocate_debug_section
802 will return meaningful debug information pointing at the
805 GDB has too many different data structures for section
806 addresses - a bfd, objfile, and so_list all have section
807 tables, as does exec_ops. Some of these could probably
810 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
;
811 cur_sec
= cur_sec
->next
)
813 if ((bfd_get_section_flags (abfd
, cur_sec
) & SEC_ALLOC
) == 0)
816 bfd_set_section_vma (abfd
, cur_sec
, offsets
[cur_sec
->index
]);
817 exec_set_section_address (bfd_get_filename (abfd
),
819 offsets
[cur_sec
->index
]);
820 offsets
[cur_sec
->index
] = 0;
825 /* Remember the bfd indexes for the .text, .data, .bss and
827 init_objfile_sect_indices (objfile
);
831 /* Divide the file into segments, which are individual relocatable units.
832 This is the default version of the sym_fns.sym_segments function for
833 symbol readers that do not have an explicit representation of segments.
834 It assumes that object files do not have segments, and fully linked
835 files have a single segment. */
837 struct symfile_segment_data
*
838 default_symfile_segments (bfd
*abfd
)
842 struct symfile_segment_data
*data
;
845 /* Relocatable files contain enough information to position each
846 loadable section independently; they should not be relocated
848 if ((bfd_get_file_flags (abfd
) & (EXEC_P
| DYNAMIC
)) == 0)
851 /* Make sure there is at least one loadable section in the file. */
852 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
854 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
862 low
= bfd_get_section_vma (abfd
, sect
);
863 high
= low
+ bfd_get_section_size (sect
);
865 data
= XZALLOC (struct symfile_segment_data
);
866 data
->num_segments
= 1;
867 data
->segment_bases
= XCALLOC (1, CORE_ADDR
);
868 data
->segment_sizes
= XCALLOC (1, CORE_ADDR
);
870 num_sections
= bfd_count_sections (abfd
);
871 data
->segment_info
= XCALLOC (num_sections
, int);
873 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
877 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
880 vma
= bfd_get_section_vma (abfd
, sect
);
883 if (vma
+ bfd_get_section_size (sect
) > high
)
884 high
= vma
+ bfd_get_section_size (sect
);
886 data
->segment_info
[i
] = 1;
889 data
->segment_bases
[0] = low
;
890 data
->segment_sizes
[0] = high
- low
;
895 /* Process a symbol file, as either the main file or as a dynamically
898 OBJFILE is where the symbols are to be read from.
900 ADDRS is the list of section load addresses. If the user has given
901 an 'add-symbol-file' command, then this is the list of offsets and
902 addresses he or she provided as arguments to the command; or, if
903 we're handling a shared library, these are the actual addresses the
904 sections are loaded at, according to the inferior's dynamic linker
905 (as gleaned by GDB's shared library code). We convert each address
906 into an offset from the section VMA's as it appears in the object
907 file, and then call the file's sym_offsets function to convert this
908 into a format-specific offset table --- a `struct section_offsets'.
909 If ADDRS is non-zero, OFFSETS must be zero.
911 OFFSETS is a table of section offsets already in the right
912 format-specific representation. NUM_OFFSETS is the number of
913 elements present in OFFSETS->offsets. If OFFSETS is non-zero, we
914 assume this is the proper table the call to sym_offsets described
915 above would produce. Instead of calling sym_offsets, we just dump
916 it right into objfile->section_offsets. (When we're re-reading
917 symbols from an objfile, we don't have the original load address
918 list any more; all we have is the section offset table.) If
919 OFFSETS is non-zero, ADDRS must be zero.
921 ADD_FLAGS encodes verbosity level, whether this is main symbol or
922 an extra symbol file such as dynamically loaded code, and wether
923 breakpoint reset should be deferred. */
926 syms_from_objfile (struct objfile
*objfile
,
927 struct section_addr_info
*addrs
,
928 struct section_offsets
*offsets
,
932 struct section_addr_info
*local_addr
= NULL
;
933 struct cleanup
*old_chain
;
934 const int mainline
= add_flags
& SYMFILE_MAINLINE
;
936 gdb_assert (! (addrs
&& offsets
));
938 init_entry_point_info (objfile
);
939 objfile
->sf
= find_sym_fns (objfile
->obfd
);
941 if (objfile
->sf
== NULL
)
942 return; /* No symbols. */
944 /* Make sure that partially constructed symbol tables will be cleaned up
945 if an error occurs during symbol reading. */
946 old_chain
= make_cleanup_free_objfile (objfile
);
948 /* If ADDRS and OFFSETS are both NULL, put together a dummy address
949 list. We now establish the convention that an addr of zero means
950 no load address was specified. */
951 if (! addrs
&& ! offsets
)
954 = alloc_section_addr_info (bfd_count_sections (objfile
->obfd
));
955 make_cleanup (xfree
, local_addr
);
959 /* Now either addrs or offsets is non-zero. */
963 /* We will modify the main symbol table, make sure that all its users
964 will be cleaned up if an error occurs during symbol reading. */
965 make_cleanup (clear_symtab_users_cleanup
, 0 /*ignore*/);
967 /* Since no error yet, throw away the old symbol table. */
969 if (symfile_objfile
!= NULL
)
971 free_objfile (symfile_objfile
);
972 gdb_assert (symfile_objfile
== NULL
);
975 /* Currently we keep symbols from the add-symbol-file command.
976 If the user wants to get rid of them, they should do "symbol-file"
977 without arguments first. Not sure this is the best behavior
980 (*objfile
->sf
->sym_new_init
) (objfile
);
983 /* Convert addr into an offset rather than an absolute address.
984 We find the lowest address of a loaded segment in the objfile,
985 and assume that <addr> is where that got loaded.
987 We no longer warn if the lowest section is not a text segment (as
988 happens for the PA64 port. */
989 if (addrs
&& addrs
->other
[0].name
)
990 addr_info_make_relative (addrs
, objfile
->obfd
);
992 /* Initialize symbol reading routines for this objfile, allow complaints to
993 appear for this new file, and record how verbose to be, then do the
994 initial symbol reading for this file. */
996 (*objfile
->sf
->sym_init
) (objfile
);
997 clear_complaints (&symfile_complaints
, 1, add_flags
& SYMFILE_VERBOSE
);
1000 (*objfile
->sf
->sym_offsets
) (objfile
, addrs
);
1003 size_t size
= SIZEOF_N_SECTION_OFFSETS (num_offsets
);
1005 /* Just copy in the offset table directly as given to us. */
1006 objfile
->num_sections
= num_offsets
;
1007 objfile
->section_offsets
1008 = ((struct section_offsets
*)
1009 obstack_alloc (&objfile
->objfile_obstack
, size
));
1010 memcpy (objfile
->section_offsets
, offsets
, size
);
1012 init_objfile_sect_indices (objfile
);
1015 (*objfile
->sf
->sym_read
) (objfile
, add_flags
);
1017 if ((add_flags
& SYMFILE_NO_READ
) == 0)
1018 require_partial_symbols (objfile
, 0);
1020 /* Discard cleanups as symbol reading was successful. */
1022 discard_cleanups (old_chain
);
1026 /* Perform required actions after either reading in the initial
1027 symbols for a new objfile, or mapping in the symbols from a reusable
1028 objfile. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
1031 new_symfile_objfile (struct objfile
*objfile
, int add_flags
)
1033 /* If this is the main symbol file we have to clean up all users of the
1034 old main symbol file. Otherwise it is sufficient to fixup all the
1035 breakpoints that may have been redefined by this symbol file. */
1036 if (add_flags
& SYMFILE_MAINLINE
)
1038 /* OK, make it the "real" symbol file. */
1039 symfile_objfile
= objfile
;
1041 clear_symtab_users (add_flags
);
1043 else if ((add_flags
& SYMFILE_DEFER_BP_RESET
) == 0)
1045 breakpoint_re_set ();
1048 /* We're done reading the symbol file; finish off complaints. */
1049 clear_complaints (&symfile_complaints
, 0, add_flags
& SYMFILE_VERBOSE
);
1052 /* Process a symbol file, as either the main file or as a dynamically
1055 ABFD is a BFD already open on the file, as from symfile_bfd_open.
1056 This BFD will be closed on error, and is always consumed by this function.
1058 ADD_FLAGS encodes verbosity, whether this is main symbol file or
1059 extra, such as dynamically loaded code, and what to do with breakpoins.
1061 ADDRS, OFFSETS, and NUM_OFFSETS are as described for
1062 syms_from_objfile, above.
1063 ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS.
1065 PARENT is the original objfile if ABFD is a separate debug info file.
1066 Otherwise PARENT is NULL.
1068 Upon success, returns a pointer to the objfile that was added.
1069 Upon failure, jumps back to command level (never returns). */
1071 static struct objfile
*
1072 symbol_file_add_with_addrs_or_offsets (bfd
*abfd
,
1074 struct section_addr_info
*addrs
,
1075 struct section_offsets
*offsets
,
1077 int flags
, struct objfile
*parent
)
1079 struct objfile
*objfile
;
1080 struct cleanup
*my_cleanups
;
1081 const char *name
= bfd_get_filename (abfd
);
1082 const int from_tty
= add_flags
& SYMFILE_VERBOSE
;
1083 const int mainline
= add_flags
& SYMFILE_MAINLINE
;
1084 const int should_print
= ((from_tty
|| info_verbose
)
1085 && (readnow_symbol_files
1086 || (add_flags
& SYMFILE_NO_READ
) == 0));
1088 if (readnow_symbol_files
)
1090 flags
|= OBJF_READNOW
;
1091 add_flags
&= ~SYMFILE_NO_READ
;
1094 my_cleanups
= make_cleanup_bfd_close (abfd
);
1096 /* Give user a chance to burp if we'd be
1097 interactively wiping out any existing symbols. */
1099 if ((have_full_symbols () || have_partial_symbols ())
1102 && !query (_("Load new symbol table from \"%s\"? "), name
))
1103 error (_("Not confirmed."));
1105 objfile
= allocate_objfile (abfd
, flags
| (mainline
? OBJF_MAINLINE
: 0));
1106 discard_cleanups (my_cleanups
);
1109 add_separate_debug_objfile (objfile
, parent
);
1111 /* We either created a new mapped symbol table, mapped an existing
1112 symbol table file which has not had initial symbol reading
1113 performed, or need to read an unmapped symbol table. */
1116 if (deprecated_pre_add_symbol_hook
)
1117 deprecated_pre_add_symbol_hook (name
);
1120 printf_unfiltered (_("Reading symbols from %s..."), name
);
1122 gdb_flush (gdb_stdout
);
1125 syms_from_objfile (objfile
, addrs
, offsets
, num_offsets
,
1128 /* We now have at least a partial symbol table. Check to see if the
1129 user requested that all symbols be read on initial access via either
1130 the gdb startup command line or on a per symbol file basis. Expand
1131 all partial symbol tables for this objfile if so. */
1133 if ((flags
& OBJF_READNOW
))
1137 printf_unfiltered (_("expanding to full symbols..."));
1139 gdb_flush (gdb_stdout
);
1143 objfile
->sf
->qf
->expand_all_symtabs (objfile
);
1146 if (should_print
&& !objfile_has_symbols (objfile
))
1149 printf_unfiltered (_("(no debugging symbols found)..."));
1155 if (deprecated_post_add_symbol_hook
)
1156 deprecated_post_add_symbol_hook ();
1158 printf_unfiltered (_("done.\n"));
1161 /* We print some messages regardless of whether 'from_tty ||
1162 info_verbose' is true, so make sure they go out at the right
1164 gdb_flush (gdb_stdout
);
1166 if (objfile
->sf
== NULL
)
1168 observer_notify_new_objfile (objfile
);
1169 return objfile
; /* No symbols. */
1172 new_symfile_objfile (objfile
, add_flags
);
1174 observer_notify_new_objfile (objfile
);
1176 bfd_cache_close_all ();
1180 /* Add BFD as a separate debug file for OBJFILE. */
1183 symbol_file_add_separate (bfd
*bfd
, int symfile_flags
, struct objfile
*objfile
)
1185 struct objfile
*new_objfile
;
1186 struct section_addr_info
*sap
;
1187 struct cleanup
*my_cleanup
;
1189 /* Create section_addr_info. We can't directly use offsets from OBJFILE
1190 because sections of BFD may not match sections of OBJFILE and because
1191 vma may have been modified by tools such as prelink. */
1192 sap
= build_section_addr_info_from_objfile (objfile
);
1193 my_cleanup
= make_cleanup_free_section_addr_info (sap
);
1195 new_objfile
= symbol_file_add_with_addrs_or_offsets
1196 (bfd
, symfile_flags
,
1198 objfile
->flags
& (OBJF_REORDERED
| OBJF_SHARED
| OBJF_READNOW
1202 do_cleanups (my_cleanup
);
1205 /* Process the symbol file ABFD, as either the main file or as a
1206 dynamically loaded file.
1208 See symbol_file_add_with_addrs_or_offsets's comments for
1211 symbol_file_add_from_bfd (bfd
*abfd
, int add_flags
,
1212 struct section_addr_info
*addrs
,
1213 int flags
, struct objfile
*parent
)
1215 return symbol_file_add_with_addrs_or_offsets (abfd
, add_flags
, addrs
, 0, 0,
1220 /* Process a symbol file, as either the main file or as a dynamically
1221 loaded file. See symbol_file_add_with_addrs_or_offsets's comments
1224 symbol_file_add (char *name
, int add_flags
, struct section_addr_info
*addrs
,
1227 return symbol_file_add_from_bfd (symfile_bfd_open (name
), add_flags
, addrs
,
1232 /* Call symbol_file_add() with default values and update whatever is
1233 affected by the loading of a new main().
1234 Used when the file is supplied in the gdb command line
1235 and by some targets with special loading requirements.
1236 The auxiliary function, symbol_file_add_main_1(), has the flags
1237 argument for the switches that can only be specified in the symbol_file
1241 symbol_file_add_main (char *args
, int from_tty
)
1243 symbol_file_add_main_1 (args
, from_tty
, 0);
1247 symbol_file_add_main_1 (char *args
, int from_tty
, int flags
)
1249 const int add_flags
= SYMFILE_MAINLINE
| (from_tty
? SYMFILE_VERBOSE
: 0);
1250 symbol_file_add (args
, add_flags
, NULL
, flags
);
1252 /* Getting new symbols may change our opinion about
1253 what is frameless. */
1254 reinit_frame_cache ();
1256 set_initial_language ();
1260 symbol_file_clear (int from_tty
)
1262 if ((have_full_symbols () || have_partial_symbols ())
1265 ? !query (_("Discard symbol table from `%s'? "),
1266 symfile_objfile
->name
)
1267 : !query (_("Discard symbol table? "))))
1268 error (_("Not confirmed."));
1270 /* solib descriptors may have handles to objfiles. Wipe them before their
1271 objfiles get stale by free_all_objfiles. */
1272 no_shared_libraries (NULL
, from_tty
);
1274 free_all_objfiles ();
1276 gdb_assert (symfile_objfile
== NULL
);
1278 printf_unfiltered (_("No symbol file now.\n"));
1282 get_debug_link_info (struct objfile
*objfile
, unsigned long *crc32_out
)
1285 bfd_size_type debuglink_size
;
1286 unsigned long crc32
;
1290 sect
= bfd_get_section_by_name (objfile
->obfd
, ".gnu_debuglink");
1295 debuglink_size
= bfd_section_size (objfile
->obfd
, sect
);
1297 contents
= xmalloc (debuglink_size
);
1298 bfd_get_section_contents (objfile
->obfd
, sect
, contents
,
1299 (file_ptr
)0, (bfd_size_type
)debuglink_size
);
1301 /* Crc value is stored after the filename, aligned up to 4 bytes. */
1302 crc_offset
= strlen (contents
) + 1;
1303 crc_offset
= (crc_offset
+ 3) & ~3;
1305 crc32
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) (contents
+ crc_offset
));
1311 /* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and
1312 return 1. Otherwise print a warning and return 0. ABFD seek position is
1316 get_file_crc (bfd
*abfd
, unsigned long *file_crc_return
)
1318 unsigned long file_crc
= 0;
1320 if (bfd_seek (abfd
, 0, SEEK_SET
) != 0)
1322 warning (_("Problem reading \"%s\" for CRC: %s"),
1323 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
1329 gdb_byte buffer
[8 * 1024];
1330 bfd_size_type count
;
1332 count
= bfd_bread (buffer
, sizeof (buffer
), abfd
);
1333 if (count
== (bfd_size_type
) -1)
1335 warning (_("Problem reading \"%s\" for CRC: %s"),
1336 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
1341 file_crc
= gnu_debuglink_crc32 (file_crc
, buffer
, count
);
1344 *file_crc_return
= file_crc
;
1349 separate_debug_file_exists (const char *name
, unsigned long crc
,
1350 struct objfile
*parent_objfile
)
1352 unsigned long file_crc
;
1355 struct stat parent_stat
, abfd_stat
;
1356 int verified_as_different
;
1358 /* Find a separate debug info file as if symbols would be present in
1359 PARENT_OBJFILE itself this function would not be called. .gnu_debuglink
1360 section can contain just the basename of PARENT_OBJFILE without any
1361 ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where
1362 the separate debug infos with the same basename can exist. */
1364 if (filename_cmp (name
, parent_objfile
->name
) == 0)
1367 abfd
= bfd_open_maybe_remote (name
);
1372 /* Verify symlinks were not the cause of filename_cmp name difference above.
1374 Some operating systems, e.g. Windows, do not provide a meaningful
1375 st_ino; they always set it to zero. (Windows does provide a
1376 meaningful st_dev.) Do not indicate a duplicate library in that
1377 case. While there is no guarantee that a system that provides
1378 meaningful inode numbers will never set st_ino to zero, this is
1379 merely an optimization, so we do not need to worry about false
1382 if (bfd_stat (abfd
, &abfd_stat
) == 0
1383 && abfd_stat
.st_ino
!= 0
1384 && bfd_stat (parent_objfile
->obfd
, &parent_stat
) == 0)
1386 if (abfd_stat
.st_dev
== parent_stat
.st_dev
1387 && abfd_stat
.st_ino
== parent_stat
.st_ino
)
1392 verified_as_different
= 1;
1395 verified_as_different
= 0;
1397 file_crc_p
= get_file_crc (abfd
, &file_crc
);
1404 if (crc
!= file_crc
)
1406 /* If one (or both) the files are accessed for example the via "remote:"
1407 gdbserver way it does not support the bfd_stat operation. Verify
1408 whether those two files are not the same manually. */
1410 if (!verified_as_different
&& !parent_objfile
->crc32_p
)
1412 parent_objfile
->crc32_p
= get_file_crc (parent_objfile
->obfd
,
1413 &parent_objfile
->crc32
);
1414 if (!parent_objfile
->crc32_p
)
1418 if (verified_as_different
|| parent_objfile
->crc32
!= file_crc
)
1419 warning (_("the debug information found in \"%s\""
1420 " does not match \"%s\" (CRC mismatch).\n"),
1421 name
, parent_objfile
->name
);
1429 char *debug_file_directory
= NULL
;
1431 show_debug_file_directory (struct ui_file
*file
, int from_tty
,
1432 struct cmd_list_element
*c
, const char *value
)
1434 fprintf_filtered (file
,
1435 _("The directory where separate debug "
1436 "symbols are searched for is \"%s\".\n"),
1440 #if ! defined (DEBUG_SUBDIRECTORY)
1441 #define DEBUG_SUBDIRECTORY ".debug"
1445 find_separate_debug_file_by_debuglink (struct objfile
*objfile
)
1447 char *basename
, *debugdir
;
1449 char *debugfile
= NULL
;
1450 char *canon_name
= NULL
;
1451 unsigned long crc32
;
1454 basename
= get_debug_link_info (objfile
, &crc32
);
1456 if (basename
== NULL
)
1457 /* There's no separate debug info, hence there's no way we could
1458 load it => no warning. */
1459 goto cleanup_return_debugfile
;
1461 dir
= xstrdup (objfile
->name
);
1463 /* Strip off the final filename part, leaving the directory name,
1464 followed by a slash. The directory can be relative or absolute. */
1465 for (i
= strlen(dir
) - 1; i
>= 0; i
--)
1467 if (IS_DIR_SEPARATOR (dir
[i
]))
1470 /* If I is -1 then no directory is present there and DIR will be "". */
1473 /* Set I to max (strlen (canon_name), strlen (dir)). */
1474 canon_name
= lrealpath (dir
);
1476 if (canon_name
&& strlen (canon_name
) > i
)
1477 i
= strlen (canon_name
);
1479 debugfile
= xmalloc (strlen (debug_file_directory
) + 1
1481 + strlen (DEBUG_SUBDIRECTORY
)
1486 /* First try in the same directory as the original file. */
1487 strcpy (debugfile
, dir
);
1488 strcat (debugfile
, basename
);
1490 if (separate_debug_file_exists (debugfile
, crc32
, objfile
))
1491 goto cleanup_return_debugfile
;
1493 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */
1494 strcpy (debugfile
, dir
);
1495 strcat (debugfile
, DEBUG_SUBDIRECTORY
);
1496 strcat (debugfile
, "/");
1497 strcat (debugfile
, basename
);
1499 if (separate_debug_file_exists (debugfile
, crc32
, objfile
))
1500 goto cleanup_return_debugfile
;
1502 /* Then try in the global debugfile directories.
1504 Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
1505 cause "/..." lookups. */
1507 debugdir
= debug_file_directory
;
1512 while (*debugdir
== DIRNAME_SEPARATOR
)
1515 debugdir_end
= strchr (debugdir
, DIRNAME_SEPARATOR
);
1516 if (debugdir_end
== NULL
)
1517 debugdir_end
= &debugdir
[strlen (debugdir
)];
1519 memcpy (debugfile
, debugdir
, debugdir_end
- debugdir
);
1520 debugfile
[debugdir_end
- debugdir
] = 0;
1521 strcat (debugfile
, "/");
1522 strcat (debugfile
, dir
);
1523 strcat (debugfile
, basename
);
1525 if (separate_debug_file_exists (debugfile
, crc32
, objfile
))
1526 goto cleanup_return_debugfile
;
1528 /* If the file is in the sysroot, try using its base path in the
1529 global debugfile directory. */
1531 && filename_ncmp (canon_name
, gdb_sysroot
,
1532 strlen (gdb_sysroot
)) == 0
1533 && IS_DIR_SEPARATOR (canon_name
[strlen (gdb_sysroot
)]))
1535 memcpy (debugfile
, debugdir
, debugdir_end
- debugdir
);
1536 debugfile
[debugdir_end
- debugdir
] = 0;
1537 strcat (debugfile
, canon_name
+ strlen (gdb_sysroot
));
1538 strcat (debugfile
, "/");
1539 strcat (debugfile
, basename
);
1541 if (separate_debug_file_exists (debugfile
, crc32
, objfile
))
1542 goto cleanup_return_debugfile
;
1545 debugdir
= debugdir_end
;
1547 while (*debugdir
!= 0);
1552 cleanup_return_debugfile
:
1560 /* This is the symbol-file command. Read the file, analyze its
1561 symbols, and add a struct symtab to a symtab list. The syntax of
1562 the command is rather bizarre:
1564 1. The function buildargv implements various quoting conventions
1565 which are undocumented and have little or nothing in common with
1566 the way things are quoted (or not quoted) elsewhere in GDB.
1568 2. Options are used, which are not generally used in GDB (perhaps
1569 "set mapped on", "set readnow on" would be better)
1571 3. The order of options matters, which is contrary to GNU
1572 conventions (because it is confusing and inconvenient). */
1575 symbol_file_command (char *args
, int from_tty
)
1581 symbol_file_clear (from_tty
);
1585 char **argv
= gdb_buildargv (args
);
1586 int flags
= OBJF_USERLOADED
;
1587 struct cleanup
*cleanups
;
1590 cleanups
= make_cleanup_freeargv (argv
);
1591 while (*argv
!= NULL
)
1593 if (strcmp (*argv
, "-readnow") == 0)
1594 flags
|= OBJF_READNOW
;
1595 else if (**argv
== '-')
1596 error (_("unknown option `%s'"), *argv
);
1599 symbol_file_add_main_1 (*argv
, from_tty
, flags
);
1607 error (_("no symbol file name was specified"));
1609 do_cleanups (cleanups
);
1613 /* Set the initial language.
1615 FIXME: A better solution would be to record the language in the
1616 psymtab when reading partial symbols, and then use it (if known) to
1617 set the language. This would be a win for formats that encode the
1618 language in an easily discoverable place, such as DWARF. For
1619 stabs, we can jump through hoops looking for specially named
1620 symbols or try to intuit the language from the specific type of
1621 stabs we find, but we can't do that until later when we read in
1625 set_initial_language (void)
1627 enum language lang
= language_unknown
;
1629 if (language_of_main
!= language_unknown
)
1630 lang
= language_of_main
;
1633 const char *filename
;
1635 filename
= find_main_filename ();
1636 if (filename
!= NULL
)
1637 lang
= deduce_language_from_filename (filename
);
1640 if (lang
== language_unknown
)
1642 /* Make C the default language */
1646 set_language (lang
);
1647 expected_language
= current_language
; /* Don't warn the user. */
1650 /* If NAME is a remote name open the file using remote protocol, otherwise
1651 open it normally. */
1654 bfd_open_maybe_remote (const char *name
)
1656 if (remote_filename_p (name
))
1657 return remote_bfd_open (name
, gnutarget
);
1659 return bfd_openr (name
, gnutarget
);
1663 /* Open the file specified by NAME and hand it off to BFD for
1664 preliminary analysis. Return a newly initialized bfd *, which
1665 includes a newly malloc'd` copy of NAME (tilde-expanded and made
1666 absolute). In case of trouble, error() is called. */
1669 symfile_bfd_open (char *name
)
1673 char *absolute_name
;
1675 if (remote_filename_p (name
))
1677 name
= xstrdup (name
);
1678 sym_bfd
= remote_bfd_open (name
, gnutarget
);
1681 make_cleanup (xfree
, name
);
1682 error (_("`%s': can't open to read symbols: %s."), name
,
1683 bfd_errmsg (bfd_get_error ()));
1686 if (!bfd_check_format (sym_bfd
, bfd_object
))
1688 bfd_close (sym_bfd
);
1689 make_cleanup (xfree
, name
);
1690 error (_("`%s': can't read symbols: %s."), name
,
1691 bfd_errmsg (bfd_get_error ()));
1697 name
= tilde_expand (name
); /* Returns 1st new malloc'd copy. */
1699 /* Look down path for it, allocate 2nd new malloc'd copy. */
1700 desc
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
, name
,
1701 O_RDONLY
| O_BINARY
, &absolute_name
);
1702 #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__)
1705 char *exename
= alloca (strlen (name
) + 5);
1707 strcat (strcpy (exename
, name
), ".exe");
1708 desc
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
, exename
,
1709 O_RDONLY
| O_BINARY
, &absolute_name
);
1714 make_cleanup (xfree
, name
);
1715 perror_with_name (name
);
1718 /* Free 1st new malloc'd copy, but keep the 2nd malloc'd copy in
1719 bfd. It'll be freed in free_objfile(). */
1721 name
= absolute_name
;
1723 sym_bfd
= bfd_fopen (name
, gnutarget
, FOPEN_RB
, desc
);
1727 make_cleanup (xfree
, name
);
1728 error (_("`%s': can't open to read symbols: %s."), name
,
1729 bfd_errmsg (bfd_get_error ()));
1731 bfd_set_cacheable (sym_bfd
, 1);
1733 if (!bfd_check_format (sym_bfd
, bfd_object
))
1735 /* FIXME: should be checking for errors from bfd_close (for one
1736 thing, on error it does not free all the storage associated
1738 bfd_close (sym_bfd
); /* This also closes desc. */
1739 make_cleanup (xfree
, name
);
1740 error (_("`%s': can't read symbols: %s."), name
,
1741 bfd_errmsg (bfd_get_error ()));
1744 /* bfd_usrdata exists for applications and libbfd must not touch it. */
1745 gdb_assert (bfd_usrdata (sym_bfd
) == NULL
);
1750 /* Return the section index for SECTION_NAME on OBJFILE. Return -1 if
1751 the section was not found. */
1754 get_section_index (struct objfile
*objfile
, char *section_name
)
1756 asection
*sect
= bfd_get_section_by_name (objfile
->obfd
, section_name
);
1764 /* Link SF into the global symtab_fns list. Called on startup by the
1765 _initialize routine in each object file format reader, to register
1766 information about each format the reader is prepared to handle. */
1769 add_symtab_fns (const struct sym_fns
*sf
)
1771 VEC_safe_push (sym_fns_ptr
, symtab_fns
, sf
);
1774 /* Initialize OBJFILE to read symbols from its associated BFD. It
1775 either returns or calls error(). The result is an initialized
1776 struct sym_fns in the objfile structure, that contains cached
1777 information about the symbol file. */
1779 static const struct sym_fns
*
1780 find_sym_fns (bfd
*abfd
)
1782 const struct sym_fns
*sf
;
1783 enum bfd_flavour our_flavour
= bfd_get_flavour (abfd
);
1786 if (our_flavour
== bfd_target_srec_flavour
1787 || our_flavour
== bfd_target_ihex_flavour
1788 || our_flavour
== bfd_target_tekhex_flavour
)
1789 return NULL
; /* No symbols. */
1791 for (i
= 0; VEC_iterate (sym_fns_ptr
, symtab_fns
, i
, sf
); ++i
)
1792 if (our_flavour
== sf
->sym_flavour
)
1795 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."),
1796 bfd_get_target (abfd
));
1800 /* This function runs the load command of our current target. */
1803 load_command (char *arg
, int from_tty
)
1807 /* The user might be reloading because the binary has changed. Take
1808 this opportunity to check. */
1809 reopen_exec_file ();
1817 parg
= arg
= get_exec_file (1);
1819 /* Count how many \ " ' tab space there are in the name. */
1820 while ((parg
= strpbrk (parg
, "\\\"'\t ")))
1828 /* We need to quote this string so buildargv can pull it apart. */
1829 char *temp
= xmalloc (strlen (arg
) + count
+ 1 );
1833 make_cleanup (xfree
, temp
);
1836 while ((parg
= strpbrk (parg
, "\\\"'\t ")))
1838 strncpy (ptemp
, prev
, parg
- prev
);
1839 ptemp
+= parg
- prev
;
1843 strcpy (ptemp
, prev
);
1849 target_load (arg
, from_tty
);
1851 /* After re-loading the executable, we don't really know which
1852 overlays are mapped any more. */
1853 overlay_cache_invalid
= 1;
1856 /* This version of "load" should be usable for any target. Currently
1857 it is just used for remote targets, not inftarg.c or core files,
1858 on the theory that only in that case is it useful.
1860 Avoiding xmodem and the like seems like a win (a) because we don't have
1861 to worry about finding it, and (b) On VMS, fork() is very slow and so
1862 we don't want to run a subprocess. On the other hand, I'm not sure how
1863 performance compares. */
1865 static int validate_download
= 0;
1867 /* Callback service function for generic_load (bfd_map_over_sections). */
1870 add_section_size_callback (bfd
*abfd
, asection
*asec
, void *data
)
1872 bfd_size_type
*sum
= data
;
1874 *sum
+= bfd_get_section_size (asec
);
1877 /* Opaque data for load_section_callback. */
1878 struct load_section_data
{
1879 unsigned long load_offset
;
1880 struct load_progress_data
*progress_data
;
1881 VEC(memory_write_request_s
) *requests
;
1884 /* Opaque data for load_progress. */
1885 struct load_progress_data
{
1886 /* Cumulative data. */
1887 unsigned long write_count
;
1888 unsigned long data_count
;
1889 bfd_size_type total_size
;
1892 /* Opaque data for load_progress for a single section. */
1893 struct load_progress_section_data
{
1894 struct load_progress_data
*cumulative
;
1896 /* Per-section data. */
1897 const char *section_name
;
1898 ULONGEST section_sent
;
1899 ULONGEST section_size
;
1904 /* Target write callback routine for progress reporting. */
1907 load_progress (ULONGEST bytes
, void *untyped_arg
)
1909 struct load_progress_section_data
*args
= untyped_arg
;
1910 struct load_progress_data
*totals
;
1913 /* Writing padding data. No easy way to get at the cumulative
1914 stats, so just ignore this. */
1917 totals
= args
->cumulative
;
1919 if (bytes
== 0 && args
->section_sent
== 0)
1921 /* The write is just starting. Let the user know we've started
1923 ui_out_message (current_uiout
, 0, "Loading section %s, size %s lma %s\n",
1924 args
->section_name
, hex_string (args
->section_size
),
1925 paddress (target_gdbarch
, args
->lma
));
1929 if (validate_download
)
1931 /* Broken memories and broken monitors manifest themselves here
1932 when bring new computers to life. This doubles already slow
1934 /* NOTE: cagney/1999-10-18: A more efficient implementation
1935 might add a verify_memory() method to the target vector and
1936 then use that. remote.c could implement that method using
1937 the ``qCRC'' packet. */
1938 gdb_byte
*check
= xmalloc (bytes
);
1939 struct cleanup
*verify_cleanups
= make_cleanup (xfree
, check
);
1941 if (target_read_memory (args
->lma
, check
, bytes
) != 0)
1942 error (_("Download verify read failed at %s"),
1943 paddress (target_gdbarch
, args
->lma
));
1944 if (memcmp (args
->buffer
, check
, bytes
) != 0)
1945 error (_("Download verify compare failed at %s"),
1946 paddress (target_gdbarch
, args
->lma
));
1947 do_cleanups (verify_cleanups
);
1949 totals
->data_count
+= bytes
;
1951 args
->buffer
+= bytes
;
1952 totals
->write_count
+= 1;
1953 args
->section_sent
+= bytes
;
1955 || (deprecated_ui_load_progress_hook
!= NULL
1956 && deprecated_ui_load_progress_hook (args
->section_name
,
1957 args
->section_sent
)))
1958 error (_("Canceled the download"));
1960 if (deprecated_show_load_progress
!= NULL
)
1961 deprecated_show_load_progress (args
->section_name
,
1965 totals
->total_size
);
1968 /* Callback service function for generic_load (bfd_map_over_sections). */
1971 load_section_callback (bfd
*abfd
, asection
*asec
, void *data
)
1973 struct memory_write_request
*new_request
;
1974 struct load_section_data
*args
= data
;
1975 struct load_progress_section_data
*section_data
;
1976 bfd_size_type size
= bfd_get_section_size (asec
);
1978 const char *sect_name
= bfd_get_section_name (abfd
, asec
);
1980 if ((bfd_get_section_flags (abfd
, asec
) & SEC_LOAD
) == 0)
1986 new_request
= VEC_safe_push (memory_write_request_s
,
1987 args
->requests
, NULL
);
1988 memset (new_request
, 0, sizeof (struct memory_write_request
));
1989 section_data
= xcalloc (1, sizeof (struct load_progress_section_data
));
1990 new_request
->begin
= bfd_section_lma (abfd
, asec
) + args
->load_offset
;
1991 new_request
->end
= new_request
->begin
+ size
; /* FIXME Should size
1993 new_request
->data
= xmalloc (size
);
1994 new_request
->baton
= section_data
;
1996 buffer
= new_request
->data
;
1998 section_data
->cumulative
= args
->progress_data
;
1999 section_data
->section_name
= sect_name
;
2000 section_data
->section_size
= size
;
2001 section_data
->lma
= new_request
->begin
;
2002 section_data
->buffer
= buffer
;
2004 bfd_get_section_contents (abfd
, asec
, buffer
, 0, size
);
2007 /* Clean up an entire memory request vector, including load
2008 data and progress records. */
2011 clear_memory_write_data (void *arg
)
2013 VEC(memory_write_request_s
) **vec_p
= arg
;
2014 VEC(memory_write_request_s
) *vec
= *vec_p
;
2016 struct memory_write_request
*mr
;
2018 for (i
= 0; VEC_iterate (memory_write_request_s
, vec
, i
, mr
); ++i
)
2023 VEC_free (memory_write_request_s
, vec
);
2027 generic_load (char *args
, int from_tty
)
2030 struct timeval start_time
, end_time
;
2032 struct cleanup
*old_cleanups
= make_cleanup (null_cleanup
, 0);
2033 struct load_section_data cbdata
;
2034 struct load_progress_data total_progress
;
2035 struct ui_out
*uiout
= current_uiout
;
2040 memset (&cbdata
, 0, sizeof (cbdata
));
2041 memset (&total_progress
, 0, sizeof (total_progress
));
2042 cbdata
.progress_data
= &total_progress
;
2044 make_cleanup (clear_memory_write_data
, &cbdata
.requests
);
2047 error_no_arg (_("file to load"));
2049 argv
= gdb_buildargv (args
);
2050 make_cleanup_freeargv (argv
);
2052 filename
= tilde_expand (argv
[0]);
2053 make_cleanup (xfree
, filename
);
2055 if (argv
[1] != NULL
)
2059 cbdata
.load_offset
= strtoul (argv
[1], &endptr
, 0);
2061 /* If the last word was not a valid number then
2062 treat it as a file name with spaces in. */
2063 if (argv
[1] == endptr
)
2064 error (_("Invalid download offset:%s."), argv
[1]);
2066 if (argv
[2] != NULL
)
2067 error (_("Too many parameters."));
2070 /* Open the file for loading. */
2071 loadfile_bfd
= bfd_openr (filename
, gnutarget
);
2072 if (loadfile_bfd
== NULL
)
2074 perror_with_name (filename
);
2078 /* FIXME: should be checking for errors from bfd_close (for one thing,
2079 on error it does not free all the storage associated with the
2081 make_cleanup_bfd_close (loadfile_bfd
);
2083 if (!bfd_check_format (loadfile_bfd
, bfd_object
))
2085 error (_("\"%s\" is not an object file: %s"), filename
,
2086 bfd_errmsg (bfd_get_error ()));
2089 bfd_map_over_sections (loadfile_bfd
, add_section_size_callback
,
2090 (void *) &total_progress
.total_size
);
2092 bfd_map_over_sections (loadfile_bfd
, load_section_callback
, &cbdata
);
2094 gettimeofday (&start_time
, NULL
);
2096 if (target_write_memory_blocks (cbdata
.requests
, flash_discard
,
2097 load_progress
) != 0)
2098 error (_("Load failed"));
2100 gettimeofday (&end_time
, NULL
);
2102 entry
= bfd_get_start_address (loadfile_bfd
);
2103 ui_out_text (uiout
, "Start address ");
2104 ui_out_field_fmt (uiout
, "address", "%s", paddress (target_gdbarch
, entry
));
2105 ui_out_text (uiout
, ", load size ");
2106 ui_out_field_fmt (uiout
, "load-size", "%lu", total_progress
.data_count
);
2107 ui_out_text (uiout
, "\n");
2108 /* We were doing this in remote-mips.c, I suspect it is right
2109 for other targets too. */
2110 regcache_write_pc (get_current_regcache (), entry
);
2112 /* Reset breakpoints, now that we have changed the load image. For
2113 instance, breakpoints may have been set (or reset, by
2114 post_create_inferior) while connected to the target but before we
2115 loaded the program. In that case, the prologue analyzer could
2116 have read instructions from the target to find the right
2117 breakpoint locations. Loading has changed the contents of that
2120 breakpoint_re_set ();
2122 /* FIXME: are we supposed to call symbol_file_add or not? According
2123 to a comment from remote-mips.c (where a call to symbol_file_add
2124 was commented out), making the call confuses GDB if more than one
2125 file is loaded in. Some targets do (e.g., remote-vx.c) but
2126 others don't (or didn't - perhaps they have all been deleted). */
2128 print_transfer_performance (gdb_stdout
, total_progress
.data_count
,
2129 total_progress
.write_count
,
2130 &start_time
, &end_time
);
2132 do_cleanups (old_cleanups
);
2135 /* Report how fast the transfer went. */
2137 /* DEPRECATED: cagney/1999-10-18: report_transfer_performance is being
2138 replaced by print_transfer_performance (with a very different
2139 function signature). */
2142 report_transfer_performance (unsigned long data_count
, time_t start_time
,
2145 struct timeval start
, end
;
2147 start
.tv_sec
= start_time
;
2149 end
.tv_sec
= end_time
;
2152 print_transfer_performance (gdb_stdout
, data_count
, 0, &start
, &end
);
2156 print_transfer_performance (struct ui_file
*stream
,
2157 unsigned long data_count
,
2158 unsigned long write_count
,
2159 const struct timeval
*start_time
,
2160 const struct timeval
*end_time
)
2162 ULONGEST time_count
;
2163 struct ui_out
*uiout
= current_uiout
;
2165 /* Compute the elapsed time in milliseconds, as a tradeoff between
2166 accuracy and overflow. */
2167 time_count
= (end_time
->tv_sec
- start_time
->tv_sec
) * 1000;
2168 time_count
+= (end_time
->tv_usec
- start_time
->tv_usec
) / 1000;
2170 ui_out_text (uiout
, "Transfer rate: ");
2173 unsigned long rate
= ((ULONGEST
) data_count
* 1000) / time_count
;
2175 if (ui_out_is_mi_like_p (uiout
))
2177 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
* 8);
2178 ui_out_text (uiout
, " bits/sec");
2180 else if (rate
< 1024)
2182 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
);
2183 ui_out_text (uiout
, " bytes/sec");
2187 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
/ 1024);
2188 ui_out_text (uiout
, " KB/sec");
2193 ui_out_field_fmt (uiout
, "transferred-bits", "%lu", (data_count
* 8));
2194 ui_out_text (uiout
, " bits in <1 sec");
2196 if (write_count
> 0)
2198 ui_out_text (uiout
, ", ");
2199 ui_out_field_fmt (uiout
, "write-rate", "%lu", data_count
/ write_count
);
2200 ui_out_text (uiout
, " bytes/write");
2202 ui_out_text (uiout
, ".\n");
2205 /* This function allows the addition of incrementally linked object files.
2206 It does not modify any state in the target, only in the debugger. */
2207 /* Note: ezannoni 2000-04-13 This function/command used to have a
2208 special case syntax for the rombug target (Rombug is the boot
2209 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the
2210 rombug case, the user doesn't need to supply a text address,
2211 instead a call to target_link() (in target.c) would supply the
2212 value to use. We are now discontinuing this type of ad hoc syntax. */
2215 add_symbol_file_command (char *args
, int from_tty
)
2217 struct gdbarch
*gdbarch
= get_current_arch ();
2218 char *filename
= NULL
;
2219 int flags
= OBJF_USERLOADED
;
2221 int section_index
= 0;
2225 int expecting_sec_name
= 0;
2226 int expecting_sec_addr
= 0;
2235 struct section_addr_info
*section_addrs
;
2236 struct sect_opt
*sect_opts
= NULL
;
2237 size_t num_sect_opts
= 0;
2238 struct cleanup
*my_cleanups
= make_cleanup (null_cleanup
, NULL
);
2241 sect_opts
= (struct sect_opt
*) xmalloc (num_sect_opts
2242 * sizeof (struct sect_opt
));
2247 error (_("add-symbol-file takes a file name and an address"));
2249 argv
= gdb_buildargv (args
);
2250 make_cleanup_freeargv (argv
);
2252 for (arg
= argv
[0], argcnt
= 0; arg
!= NULL
; arg
= argv
[++argcnt
])
2254 /* Process the argument. */
2257 /* The first argument is the file name. */
2258 filename
= tilde_expand (arg
);
2259 make_cleanup (xfree
, filename
);
2264 /* The second argument is always the text address at which
2265 to load the program. */
2266 sect_opts
[section_index
].name
= ".text";
2267 sect_opts
[section_index
].value
= arg
;
2268 if (++section_index
>= num_sect_opts
)
2271 sect_opts
= ((struct sect_opt
*)
2272 xrealloc (sect_opts
,
2274 * sizeof (struct sect_opt
)));
2279 /* It's an option (starting with '-') or it's an argument
2284 if (strcmp (arg
, "-readnow") == 0)
2285 flags
|= OBJF_READNOW
;
2286 else if (strcmp (arg
, "-s") == 0)
2288 expecting_sec_name
= 1;
2289 expecting_sec_addr
= 1;
2294 if (expecting_sec_name
)
2296 sect_opts
[section_index
].name
= arg
;
2297 expecting_sec_name
= 0;
2300 if (expecting_sec_addr
)
2302 sect_opts
[section_index
].value
= arg
;
2303 expecting_sec_addr
= 0;
2304 if (++section_index
>= num_sect_opts
)
2307 sect_opts
= ((struct sect_opt
*)
2308 xrealloc (sect_opts
,
2310 * sizeof (struct sect_opt
)));
2314 error (_("USAGE: add-symbol-file <filename> <textaddress>"
2315 " [-readnow] [-s <secname> <addr>]*"));
2320 /* This command takes at least two arguments. The first one is a
2321 filename, and the second is the address where this file has been
2322 loaded. Abort now if this address hasn't been provided by the
2324 if (section_index
< 1)
2325 error (_("The address where %s has been loaded is missing"), filename
);
2327 /* Print the prompt for the query below. And save the arguments into
2328 a sect_addr_info structure to be passed around to other
2329 functions. We have to split this up into separate print
2330 statements because hex_string returns a local static
2333 printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename
);
2334 section_addrs
= alloc_section_addr_info (section_index
);
2335 make_cleanup (xfree
, section_addrs
);
2336 for (i
= 0; i
< section_index
; i
++)
2339 char *val
= sect_opts
[i
].value
;
2340 char *sec
= sect_opts
[i
].name
;
2342 addr
= parse_and_eval_address (val
);
2344 /* Here we store the section offsets in the order they were
2345 entered on the command line. */
2346 section_addrs
->other
[sec_num
].name
= sec
;
2347 section_addrs
->other
[sec_num
].addr
= addr
;
2348 printf_unfiltered ("\t%s_addr = %s\n", sec
,
2349 paddress (gdbarch
, addr
));
2352 /* The object's sections are initialized when a
2353 call is made to build_objfile_section_table (objfile).
2354 This happens in reread_symbols.
2355 At this point, we don't know what file type this is,
2356 so we can't determine what section names are valid. */
2359 if (from_tty
&& (!query ("%s", "")))
2360 error (_("Not confirmed."));
2362 symbol_file_add (filename
, from_tty
? SYMFILE_VERBOSE
: 0,
2363 section_addrs
, flags
);
2365 /* Getting new symbols may change our opinion about what is
2367 reinit_frame_cache ();
2368 do_cleanups (my_cleanups
);
2372 typedef struct objfile
*objfilep
;
2374 DEF_VEC_P (objfilep
);
2376 /* Re-read symbols if a symbol-file has changed. */
2378 reread_symbols (void)
2380 struct objfile
*objfile
;
2382 struct stat new_statbuf
;
2384 VEC (objfilep
) *new_objfiles
= NULL
;
2385 struct cleanup
*all_cleanups
;
2387 all_cleanups
= make_cleanup (VEC_cleanup (objfilep
), &new_objfiles
);
2389 /* With the addition of shared libraries, this should be modified,
2390 the load time should be saved in the partial symbol tables, since
2391 different tables may come from different source files. FIXME.
2392 This routine should then walk down each partial symbol table
2393 and see if the symbol table that it originates from has been changed. */
2395 for (objfile
= object_files
; objfile
; objfile
= objfile
->next
)
2397 /* solib-sunos.c creates one objfile with obfd. */
2398 if (objfile
->obfd
== NULL
)
2401 /* Separate debug objfiles are handled in the main objfile. */
2402 if (objfile
->separate_debug_objfile_backlink
)
2405 /* If this object is from an archive (what you usually create with
2406 `ar', often called a `static library' on most systems, though
2407 a `shared library' on AIX is also an archive), then you should
2408 stat on the archive name, not member name. */
2409 if (objfile
->obfd
->my_archive
)
2410 res
= stat (objfile
->obfd
->my_archive
->filename
, &new_statbuf
);
2412 res
= stat (objfile
->name
, &new_statbuf
);
2415 /* FIXME, should use print_sys_errmsg but it's not filtered. */
2416 printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"),
2420 new_modtime
= new_statbuf
.st_mtime
;
2421 if (new_modtime
!= objfile
->mtime
)
2423 struct cleanup
*old_cleanups
;
2424 struct section_offsets
*offsets
;
2426 char *obfd_filename
;
2428 printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"),
2431 /* There are various functions like symbol_file_add,
2432 symfile_bfd_open, syms_from_objfile, etc., which might
2433 appear to do what we want. But they have various other
2434 effects which we *don't* want. So we just do stuff
2435 ourselves. We don't worry about mapped files (for one thing,
2436 any mapped file will be out of date). */
2438 /* If we get an error, blow away this objfile (not sure if
2439 that is the correct response for things like shared
2441 old_cleanups
= make_cleanup_free_objfile (objfile
);
2442 /* We need to do this whenever any symbols go away. */
2443 make_cleanup (clear_symtab_users_cleanup
, 0 /*ignore*/);
2445 if (exec_bfd
!= NULL
2446 && filename_cmp (bfd_get_filename (objfile
->obfd
),
2447 bfd_get_filename (exec_bfd
)) == 0)
2449 /* Reload EXEC_BFD without asking anything. */
2451 exec_file_attach (bfd_get_filename (objfile
->obfd
), 0);
2454 /* Keep the calls order approx. the same as in free_objfile. */
2456 /* Free the separate debug objfiles. It will be
2457 automatically recreated by sym_read. */
2458 free_objfile_separate_debug (objfile
);
2460 /* Remove any references to this objfile in the global
2462 preserve_values (objfile
);
2464 /* Nuke all the state that we will re-read. Much of the following
2465 code which sets things to NULL really is necessary to tell
2466 other parts of GDB that there is nothing currently there.
2468 Try to keep the freeing order compatible with free_objfile. */
2470 if (objfile
->sf
!= NULL
)
2472 (*objfile
->sf
->sym_finish
) (objfile
);
2475 clear_objfile_data (objfile
);
2477 /* Clean up any state BFD has sitting around. We don't need
2478 to close the descriptor but BFD lacks a way of closing the
2479 BFD without closing the descriptor. */
2480 obfd_filename
= bfd_get_filename (objfile
->obfd
);
2481 if (!bfd_close (objfile
->obfd
))
2482 error (_("Can't close BFD for %s: %s"), objfile
->name
,
2483 bfd_errmsg (bfd_get_error ()));
2484 objfile
->obfd
= bfd_open_maybe_remote (obfd_filename
);
2485 if (objfile
->obfd
== NULL
)
2486 error (_("Can't open %s to read symbols."), objfile
->name
);
2488 objfile
->obfd
= gdb_bfd_ref (objfile
->obfd
);
2489 /* bfd_openr sets cacheable to true, which is what we want. */
2490 if (!bfd_check_format (objfile
->obfd
, bfd_object
))
2491 error (_("Can't read symbols from %s: %s."), objfile
->name
,
2492 bfd_errmsg (bfd_get_error ()));
2494 /* Save the offsets, we will nuke them with the rest of the
2496 num_offsets
= objfile
->num_sections
;
2497 offsets
= ((struct section_offsets
*)
2498 alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets
)));
2499 memcpy (offsets
, objfile
->section_offsets
,
2500 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2502 /* FIXME: Do we have to free a whole linked list, or is this
2504 if (objfile
->global_psymbols
.list
)
2505 xfree (objfile
->global_psymbols
.list
);
2506 memset (&objfile
->global_psymbols
, 0,
2507 sizeof (objfile
->global_psymbols
));
2508 if (objfile
->static_psymbols
.list
)
2509 xfree (objfile
->static_psymbols
.list
);
2510 memset (&objfile
->static_psymbols
, 0,
2511 sizeof (objfile
->static_psymbols
));
2513 /* Free the obstacks for non-reusable objfiles. */
2514 psymbol_bcache_free (objfile
->psymbol_cache
);
2515 objfile
->psymbol_cache
= psymbol_bcache_init ();
2516 bcache_xfree (objfile
->macro_cache
);
2517 objfile
->macro_cache
= bcache_xmalloc (NULL
, NULL
);
2518 bcache_xfree (objfile
->filename_cache
);
2519 objfile
->filename_cache
= bcache_xmalloc (NULL
,NULL
);
2520 if (objfile
->demangled_names_hash
!= NULL
)
2522 htab_delete (objfile
->demangled_names_hash
);
2523 objfile
->demangled_names_hash
= NULL
;
2525 obstack_free (&objfile
->objfile_obstack
, 0);
2526 objfile
->sections
= NULL
;
2527 objfile
->symtabs
= NULL
;
2528 objfile
->psymtabs
= NULL
;
2529 objfile
->psymtabs_addrmap
= NULL
;
2530 objfile
->free_psymtabs
= NULL
;
2531 objfile
->template_symbols
= NULL
;
2532 objfile
->msymbols
= NULL
;
2533 objfile
->deprecated_sym_private
= NULL
;
2534 objfile
->minimal_symbol_count
= 0;
2535 memset (&objfile
->msymbol_hash
, 0,
2536 sizeof (objfile
->msymbol_hash
));
2537 memset (&objfile
->msymbol_demangled_hash
, 0,
2538 sizeof (objfile
->msymbol_demangled_hash
));
2540 /* obstack_init also initializes the obstack so it is
2541 empty. We could use obstack_specify_allocation but
2542 gdb_obstack.h specifies the alloc/dealloc
2544 obstack_init (&objfile
->objfile_obstack
);
2545 if (build_objfile_section_table (objfile
))
2547 error (_("Can't find the file sections in `%s': %s"),
2548 objfile
->name
, bfd_errmsg (bfd_get_error ()));
2550 terminate_minimal_symbol_table (objfile
);
2552 /* We use the same section offsets as from last time. I'm not
2553 sure whether that is always correct for shared libraries. */
2554 objfile
->section_offsets
= (struct section_offsets
*)
2555 obstack_alloc (&objfile
->objfile_obstack
,
2556 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2557 memcpy (objfile
->section_offsets
, offsets
,
2558 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2559 objfile
->num_sections
= num_offsets
;
2561 /* What the hell is sym_new_init for, anyway? The concept of
2562 distinguishing between the main file and additional files
2563 in this way seems rather dubious. */
2564 if (objfile
== symfile_objfile
)
2566 (*objfile
->sf
->sym_new_init
) (objfile
);
2569 (*objfile
->sf
->sym_init
) (objfile
);
2570 clear_complaints (&symfile_complaints
, 1, 1);
2571 /* Do not set flags as this is safe and we don't want to be
2573 (*objfile
->sf
->sym_read
) (objfile
, 0);
2574 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) != 0)
2576 objfile
->flags
&= ~OBJF_PSYMTABS_READ
;
2577 require_partial_symbols (objfile
, 0);
2580 if (!objfile_has_symbols (objfile
))
2583 printf_unfiltered (_("(no debugging symbols found)\n"));
2587 /* We're done reading the symbol file; finish off complaints. */
2588 clear_complaints (&symfile_complaints
, 0, 1);
2590 /* Getting new symbols may change our opinion about what is
2593 reinit_frame_cache ();
2595 /* Discard cleanups as symbol reading was successful. */
2596 discard_cleanups (old_cleanups
);
2598 /* If the mtime has changed between the time we set new_modtime
2599 and now, we *want* this to be out of date, so don't call stat
2601 objfile
->mtime
= new_modtime
;
2602 init_entry_point_info (objfile
);
2604 VEC_safe_push (objfilep
, new_objfiles
, objfile
);
2612 /* Notify objfiles that we've modified objfile sections. */
2613 objfiles_changed ();
2615 clear_symtab_users (0);
2617 /* clear_objfile_data for each objfile was called before freeing it and
2618 observer_notify_new_objfile (NULL) has been called by
2619 clear_symtab_users above. Notify the new files now. */
2620 for (ix
= 0; VEC_iterate (objfilep
, new_objfiles
, ix
, objfile
); ix
++)
2621 observer_notify_new_objfile (objfile
);
2623 /* At least one objfile has changed, so we can consider that
2624 the executable we're debugging has changed too. */
2625 observer_notify_executable_changed ();
2628 do_cleanups (all_cleanups
);
2640 static filename_language
*filename_language_table
;
2641 static int fl_table_size
, fl_table_next
;
2644 add_filename_language (char *ext
, enum language lang
)
2646 if (fl_table_next
>= fl_table_size
)
2648 fl_table_size
+= 10;
2649 filename_language_table
=
2650 xrealloc (filename_language_table
,
2651 fl_table_size
* sizeof (*filename_language_table
));
2654 filename_language_table
[fl_table_next
].ext
= xstrdup (ext
);
2655 filename_language_table
[fl_table_next
].lang
= lang
;
2659 static char *ext_args
;
2661 show_ext_args (struct ui_file
*file
, int from_tty
,
2662 struct cmd_list_element
*c
, const char *value
)
2664 fprintf_filtered (file
,
2665 _("Mapping between filename extension "
2666 "and source language is \"%s\".\n"),
2671 set_ext_lang_command (char *args
, int from_tty
, struct cmd_list_element
*e
)
2674 char *cp
= ext_args
;
2677 /* First arg is filename extension, starting with '.' */
2679 error (_("'%s': Filename extension must begin with '.'"), ext_args
);
2681 /* Find end of first arg. */
2682 while (*cp
&& !isspace (*cp
))
2686 error (_("'%s': two arguments required -- "
2687 "filename extension and language"),
2690 /* Null-terminate first arg. */
2693 /* Find beginning of second arg, which should be a source language. */
2694 while (*cp
&& isspace (*cp
))
2698 error (_("'%s': two arguments required -- "
2699 "filename extension and language"),
2702 /* Lookup the language from among those we know. */
2703 lang
= language_enum (cp
);
2705 /* Now lookup the filename extension: do we already know it? */
2706 for (i
= 0; i
< fl_table_next
; i
++)
2707 if (0 == strcmp (ext_args
, filename_language_table
[i
].ext
))
2710 if (i
>= fl_table_next
)
2712 /* New file extension. */
2713 add_filename_language (ext_args
, lang
);
2717 /* Redefining a previously known filename extension. */
2720 /* query ("Really make files of type %s '%s'?", */
2721 /* ext_args, language_str (lang)); */
2723 xfree (filename_language_table
[i
].ext
);
2724 filename_language_table
[i
].ext
= xstrdup (ext_args
);
2725 filename_language_table
[i
].lang
= lang
;
2730 info_ext_lang_command (char *args
, int from_tty
)
2734 printf_filtered (_("Filename extensions and the languages they represent:"));
2735 printf_filtered ("\n\n");
2736 for (i
= 0; i
< fl_table_next
; i
++)
2737 printf_filtered ("\t%s\t- %s\n",
2738 filename_language_table
[i
].ext
,
2739 language_str (filename_language_table
[i
].lang
));
2743 init_filename_language_table (void)
2745 if (fl_table_size
== 0) /* Protect against repetition. */
2749 filename_language_table
=
2750 xmalloc (fl_table_size
* sizeof (*filename_language_table
));
2751 add_filename_language (".c", language_c
);
2752 add_filename_language (".d", language_d
);
2753 add_filename_language (".C", language_cplus
);
2754 add_filename_language (".cc", language_cplus
);
2755 add_filename_language (".cp", language_cplus
);
2756 add_filename_language (".cpp", language_cplus
);
2757 add_filename_language (".cxx", language_cplus
);
2758 add_filename_language (".c++", language_cplus
);
2759 add_filename_language (".java", language_java
);
2760 add_filename_language (".class", language_java
);
2761 add_filename_language (".m", language_objc
);
2762 add_filename_language (".f", language_fortran
);
2763 add_filename_language (".F", language_fortran
);
2764 add_filename_language (".for", language_fortran
);
2765 add_filename_language (".FOR", language_fortran
);
2766 add_filename_language (".ftn", language_fortran
);
2767 add_filename_language (".FTN", language_fortran
);
2768 add_filename_language (".fpp", language_fortran
);
2769 add_filename_language (".FPP", language_fortran
);
2770 add_filename_language (".f90", language_fortran
);
2771 add_filename_language (".F90", language_fortran
);
2772 add_filename_language (".f95", language_fortran
);
2773 add_filename_language (".F95", language_fortran
);
2774 add_filename_language (".f03", language_fortran
);
2775 add_filename_language (".F03", language_fortran
);
2776 add_filename_language (".f08", language_fortran
);
2777 add_filename_language (".F08", language_fortran
);
2778 add_filename_language (".s", language_asm
);
2779 add_filename_language (".sx", language_asm
);
2780 add_filename_language (".S", language_asm
);
2781 add_filename_language (".pas", language_pascal
);
2782 add_filename_language (".p", language_pascal
);
2783 add_filename_language (".pp", language_pascal
);
2784 add_filename_language (".adb", language_ada
);
2785 add_filename_language (".ads", language_ada
);
2786 add_filename_language (".a", language_ada
);
2787 add_filename_language (".ada", language_ada
);
2788 add_filename_language (".dg", language_ada
);
2793 deduce_language_from_filename (const char *filename
)
2798 if (filename
!= NULL
)
2799 if ((cp
= strrchr (filename
, '.')) != NULL
)
2800 for (i
= 0; i
< fl_table_next
; i
++)
2801 if (strcmp (cp
, filename_language_table
[i
].ext
) == 0)
2802 return filename_language_table
[i
].lang
;
2804 return language_unknown
;
2809 Allocate and partly initialize a new symbol table. Return a pointer
2810 to it. error() if no space.
2812 Caller must set these fields:
2821 allocate_symtab (const char *filename
, struct objfile
*objfile
)
2823 struct symtab
*symtab
;
2825 symtab
= (struct symtab
*)
2826 obstack_alloc (&objfile
->objfile_obstack
, sizeof (struct symtab
));
2827 memset (symtab
, 0, sizeof (*symtab
));
2828 symtab
->filename
= (char *) bcache (filename
, strlen (filename
) + 1,
2829 objfile
->filename_cache
);
2830 symtab
->fullname
= NULL
;
2831 symtab
->language
= deduce_language_from_filename (filename
);
2832 symtab
->debugformat
= "unknown";
2834 /* Hook it to the objfile it comes from. */
2836 symtab
->objfile
= objfile
;
2837 symtab
->next
= objfile
->symtabs
;
2838 objfile
->symtabs
= symtab
;
2844 /* Reset all data structures in gdb which may contain references to symbol
2845 table data. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
2848 clear_symtab_users (int add_flags
)
2850 /* Someday, we should do better than this, by only blowing away
2851 the things that really need to be blown. */
2853 /* Clear the "current" symtab first, because it is no longer valid.
2854 breakpoint_re_set may try to access the current symtab. */
2855 clear_current_source_symtab_and_line ();
2858 if ((add_flags
& SYMFILE_DEFER_BP_RESET
) == 0)
2859 breakpoint_re_set ();
2860 clear_last_displayed_sal ();
2861 clear_pc_function_cache ();
2862 observer_notify_new_objfile (NULL
);
2864 /* Clear globals which might have pointed into a removed objfile.
2865 FIXME: It's not clear which of these are supposed to persist
2866 between expressions and which ought to be reset each time. */
2867 expression_context_block
= NULL
;
2868 innermost_block
= NULL
;
2870 /* Varobj may refer to old symbols, perform a cleanup. */
2871 varobj_invalidate ();
2876 clear_symtab_users_cleanup (void *ignore
)
2878 clear_symtab_users (0);
2882 The following code implements an abstraction for debugging overlay sections.
2884 The target model is as follows:
2885 1) The gnu linker will permit multiple sections to be mapped into the
2886 same VMA, each with its own unique LMA (or load address).
2887 2) It is assumed that some runtime mechanism exists for mapping the
2888 sections, one by one, from the load address into the VMA address.
2889 3) This code provides a mechanism for gdb to keep track of which
2890 sections should be considered to be mapped from the VMA to the LMA.
2891 This information is used for symbol lookup, and memory read/write.
2892 For instance, if a section has been mapped then its contents
2893 should be read from the VMA, otherwise from the LMA.
2895 Two levels of debugger support for overlays are available. One is
2896 "manual", in which the debugger relies on the user to tell it which
2897 overlays are currently mapped. This level of support is
2898 implemented entirely in the core debugger, and the information about
2899 whether a section is mapped is kept in the objfile->obj_section table.
2901 The second level of support is "automatic", and is only available if
2902 the target-specific code provides functionality to read the target's
2903 overlay mapping table, and translate its contents for the debugger
2904 (by updating the mapped state information in the obj_section tables).
2906 The interface is as follows:
2908 overlay map <name> -- tell gdb to consider this section mapped
2909 overlay unmap <name> -- tell gdb to consider this section unmapped
2910 overlay list -- list the sections that GDB thinks are mapped
2911 overlay read-target -- get the target's state of what's mapped
2912 overlay off/manual/auto -- set overlay debugging state
2913 Functional interface:
2914 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2915 section, return that section.
2916 find_pc_overlay(pc): find any overlay section that contains
2917 the pc, either in its VMA or its LMA
2918 section_is_mapped(sect): true if overlay is marked as mapped
2919 section_is_overlay(sect): true if section's VMA != LMA
2920 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2921 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2922 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap
2923 overlay_mapped_address(...): map an address from section's LMA to VMA
2924 overlay_unmapped_address(...): map an address from section's VMA to LMA
2925 symbol_overlayed_address(...): Return a "current" address for symbol:
2926 either in VMA or LMA depending on whether
2927 the symbol's section is currently mapped. */
2929 /* Overlay debugging state: */
2931 enum overlay_debugging_state overlay_debugging
= ovly_off
;
2932 int overlay_cache_invalid
= 0; /* True if need to refresh mapped state. */
2934 /* Function: section_is_overlay (SECTION)
2935 Returns true if SECTION has VMA not equal to LMA, ie.
2936 SECTION is loaded at an address different from where it will "run". */
2939 section_is_overlay (struct obj_section
*section
)
2941 if (overlay_debugging
&& section
)
2943 bfd
*abfd
= section
->objfile
->obfd
;
2944 asection
*bfd_section
= section
->the_bfd_section
;
2946 if (bfd_section_lma (abfd
, bfd_section
) != 0
2947 && bfd_section_lma (abfd
, bfd_section
)
2948 != bfd_section_vma (abfd
, bfd_section
))
2955 /* Function: overlay_invalidate_all (void)
2956 Invalidate the mapped state of all overlay sections (mark it as stale). */
2959 overlay_invalidate_all (void)
2961 struct objfile
*objfile
;
2962 struct obj_section
*sect
;
2964 ALL_OBJSECTIONS (objfile
, sect
)
2965 if (section_is_overlay (sect
))
2966 sect
->ovly_mapped
= -1;
2969 /* Function: section_is_mapped (SECTION)
2970 Returns true if section is an overlay, and is currently mapped.
2972 Access to the ovly_mapped flag is restricted to this function, so
2973 that we can do automatic update. If the global flag
2974 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
2975 overlay_invalidate_all. If the mapped state of the particular
2976 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
2979 section_is_mapped (struct obj_section
*osect
)
2981 struct gdbarch
*gdbarch
;
2983 if (osect
== 0 || !section_is_overlay (osect
))
2986 switch (overlay_debugging
)
2990 return 0; /* overlay debugging off */
2991 case ovly_auto
: /* overlay debugging automatic */
2992 /* Unles there is a gdbarch_overlay_update function,
2993 there's really nothing useful to do here (can't really go auto). */
2994 gdbarch
= get_objfile_arch (osect
->objfile
);
2995 if (gdbarch_overlay_update_p (gdbarch
))
2997 if (overlay_cache_invalid
)
2999 overlay_invalidate_all ();
3000 overlay_cache_invalid
= 0;
3002 if (osect
->ovly_mapped
== -1)
3003 gdbarch_overlay_update (gdbarch
, osect
);
3005 /* fall thru to manual case */
3006 case ovly_on
: /* overlay debugging manual */
3007 return osect
->ovly_mapped
== 1;
3011 /* Function: pc_in_unmapped_range
3012 If PC falls into the lma range of SECTION, return true, else false. */
3015 pc_in_unmapped_range (CORE_ADDR pc
, struct obj_section
*section
)
3017 if (section_is_overlay (section
))
3019 bfd
*abfd
= section
->objfile
->obfd
;
3020 asection
*bfd_section
= section
->the_bfd_section
;
3022 /* We assume the LMA is relocated by the same offset as the VMA. */
3023 bfd_vma size
= bfd_get_section_size (bfd_section
);
3024 CORE_ADDR offset
= obj_section_offset (section
);
3026 if (bfd_get_section_lma (abfd
, bfd_section
) + offset
<= pc
3027 && pc
< bfd_get_section_lma (abfd
, bfd_section
) + offset
+ size
)
3034 /* Function: pc_in_mapped_range
3035 If PC falls into the vma range of SECTION, return true, else false. */
3038 pc_in_mapped_range (CORE_ADDR pc
, struct obj_section
*section
)
3040 if (section_is_overlay (section
))
3042 if (obj_section_addr (section
) <= pc
3043 && pc
< obj_section_endaddr (section
))
3051 /* Return true if the mapped ranges of sections A and B overlap, false
3054 sections_overlap (struct obj_section
*a
, struct obj_section
*b
)
3056 CORE_ADDR a_start
= obj_section_addr (a
);
3057 CORE_ADDR a_end
= obj_section_endaddr (a
);
3058 CORE_ADDR b_start
= obj_section_addr (b
);
3059 CORE_ADDR b_end
= obj_section_endaddr (b
);
3061 return (a_start
< b_end
&& b_start
< a_end
);
3064 /* Function: overlay_unmapped_address (PC, SECTION)
3065 Returns the address corresponding to PC in the unmapped (load) range.
3066 May be the same as PC. */
3069 overlay_unmapped_address (CORE_ADDR pc
, struct obj_section
*section
)
3071 if (section_is_overlay (section
) && pc_in_mapped_range (pc
, section
))
3073 bfd
*abfd
= section
->objfile
->obfd
;
3074 asection
*bfd_section
= section
->the_bfd_section
;
3076 return pc
+ bfd_section_lma (abfd
, bfd_section
)
3077 - bfd_section_vma (abfd
, bfd_section
);
3083 /* Function: overlay_mapped_address (PC, SECTION)
3084 Returns the address corresponding to PC in the mapped (runtime) range.
3085 May be the same as PC. */
3088 overlay_mapped_address (CORE_ADDR pc
, struct obj_section
*section
)
3090 if (section_is_overlay (section
) && pc_in_unmapped_range (pc
, section
))
3092 bfd
*abfd
= section
->objfile
->obfd
;
3093 asection
*bfd_section
= section
->the_bfd_section
;
3095 return pc
+ bfd_section_vma (abfd
, bfd_section
)
3096 - bfd_section_lma (abfd
, bfd_section
);
3103 /* Function: symbol_overlayed_address
3104 Return one of two addresses (relative to the VMA or to the LMA),
3105 depending on whether the section is mapped or not. */
3108 symbol_overlayed_address (CORE_ADDR address
, struct obj_section
*section
)
3110 if (overlay_debugging
)
3112 /* If the symbol has no section, just return its regular address. */
3115 /* If the symbol's section is not an overlay, just return its
3117 if (!section_is_overlay (section
))
3119 /* If the symbol's section is mapped, just return its address. */
3120 if (section_is_mapped (section
))
3123 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
3124 * then return its LOADED address rather than its vma address!!
3126 return overlay_unmapped_address (address
, section
);
3131 /* Function: find_pc_overlay (PC)
3132 Return the best-match overlay section for PC:
3133 If PC matches a mapped overlay section's VMA, return that section.
3134 Else if PC matches an unmapped section's VMA, return that section.
3135 Else if PC matches an unmapped section's LMA, return that section. */
3137 struct obj_section
*
3138 find_pc_overlay (CORE_ADDR pc
)
3140 struct objfile
*objfile
;
3141 struct obj_section
*osect
, *best_match
= NULL
;
3143 if (overlay_debugging
)
3144 ALL_OBJSECTIONS (objfile
, osect
)
3145 if (section_is_overlay (osect
))
3147 if (pc_in_mapped_range (pc
, osect
))
3149 if (section_is_mapped (osect
))
3154 else if (pc_in_unmapped_range (pc
, osect
))
3160 /* Function: find_pc_mapped_section (PC)
3161 If PC falls into the VMA address range of an overlay section that is
3162 currently marked as MAPPED, return that section. Else return NULL. */
3164 struct obj_section
*
3165 find_pc_mapped_section (CORE_ADDR pc
)
3167 struct objfile
*objfile
;
3168 struct obj_section
*osect
;
3170 if (overlay_debugging
)
3171 ALL_OBJSECTIONS (objfile
, osect
)
3172 if (pc_in_mapped_range (pc
, osect
) && section_is_mapped (osect
))
3178 /* Function: list_overlays_command
3179 Print a list of mapped sections and their PC ranges. */
3182 list_overlays_command (char *args
, int from_tty
)
3185 struct objfile
*objfile
;
3186 struct obj_section
*osect
;
3188 if (overlay_debugging
)
3189 ALL_OBJSECTIONS (objfile
, osect
)
3190 if (section_is_mapped (osect
))
3192 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
3197 vma
= bfd_section_vma (objfile
->obfd
, osect
->the_bfd_section
);
3198 lma
= bfd_section_lma (objfile
->obfd
, osect
->the_bfd_section
);
3199 size
= bfd_get_section_size (osect
->the_bfd_section
);
3200 name
= bfd_section_name (objfile
->obfd
, osect
->the_bfd_section
);
3202 printf_filtered ("Section %s, loaded at ", name
);
3203 fputs_filtered (paddress (gdbarch
, lma
), gdb_stdout
);
3204 puts_filtered (" - ");
3205 fputs_filtered (paddress (gdbarch
, lma
+ size
), gdb_stdout
);
3206 printf_filtered (", mapped at ");
3207 fputs_filtered (paddress (gdbarch
, vma
), gdb_stdout
);
3208 puts_filtered (" - ");
3209 fputs_filtered (paddress (gdbarch
, vma
+ size
), gdb_stdout
);
3210 puts_filtered ("\n");
3215 printf_filtered (_("No sections are mapped.\n"));
3218 /* Function: map_overlay_command
3219 Mark the named section as mapped (ie. residing at its VMA address). */
3222 map_overlay_command (char *args
, int from_tty
)
3224 struct objfile
*objfile
, *objfile2
;
3225 struct obj_section
*sec
, *sec2
;
3227 if (!overlay_debugging
)
3228 error (_("Overlay debugging not enabled. Use "
3229 "either the 'overlay auto' or\n"
3230 "the 'overlay manual' command."));
3232 if (args
== 0 || *args
== 0)
3233 error (_("Argument required: name of an overlay section"));
3235 /* First, find a section matching the user supplied argument. */
3236 ALL_OBJSECTIONS (objfile
, sec
)
3237 if (!strcmp (bfd_section_name (objfile
->obfd
, sec
->the_bfd_section
), args
))
3239 /* Now, check to see if the section is an overlay. */
3240 if (!section_is_overlay (sec
))
3241 continue; /* not an overlay section */
3243 /* Mark the overlay as "mapped". */
3244 sec
->ovly_mapped
= 1;
3246 /* Next, make a pass and unmap any sections that are
3247 overlapped by this new section: */
3248 ALL_OBJSECTIONS (objfile2
, sec2
)
3249 if (sec2
->ovly_mapped
&& sec
!= sec2
&& sections_overlap (sec
, sec2
))
3252 printf_unfiltered (_("Note: section %s unmapped by overlap\n"),
3253 bfd_section_name (objfile
->obfd
,
3254 sec2
->the_bfd_section
));
3255 sec2
->ovly_mapped
= 0; /* sec2 overlaps sec: unmap sec2. */
3259 error (_("No overlay section called %s"), args
);
3262 /* Function: unmap_overlay_command
3263 Mark the overlay section as unmapped
3264 (ie. resident in its LMA address range, rather than the VMA range). */
3267 unmap_overlay_command (char *args
, int from_tty
)
3269 struct objfile
*objfile
;
3270 struct obj_section
*sec
;
3272 if (!overlay_debugging
)
3273 error (_("Overlay debugging not enabled. "
3274 "Use either the 'overlay auto' or\n"
3275 "the 'overlay manual' command."));
3277 if (args
== 0 || *args
== 0)
3278 error (_("Argument required: name of an overlay section"));
3280 /* First, find a section matching the user supplied argument. */
3281 ALL_OBJSECTIONS (objfile
, sec
)
3282 if (!strcmp (bfd_section_name (objfile
->obfd
, sec
->the_bfd_section
), args
))
3284 if (!sec
->ovly_mapped
)
3285 error (_("Section %s is not mapped"), args
);
3286 sec
->ovly_mapped
= 0;
3289 error (_("No overlay section called %s"), args
);
3292 /* Function: overlay_auto_command
3293 A utility command to turn on overlay debugging.
3294 Possibly this should be done via a set/show command. */
3297 overlay_auto_command (char *args
, int from_tty
)
3299 overlay_debugging
= ovly_auto
;
3300 enable_overlay_breakpoints ();
3302 printf_unfiltered (_("Automatic overlay debugging enabled."));
3305 /* Function: overlay_manual_command
3306 A utility command to turn on overlay debugging.
3307 Possibly this should be done via a set/show command. */
3310 overlay_manual_command (char *args
, int from_tty
)
3312 overlay_debugging
= ovly_on
;
3313 disable_overlay_breakpoints ();
3315 printf_unfiltered (_("Overlay debugging enabled."));
3318 /* Function: overlay_off_command
3319 A utility command to turn on overlay debugging.
3320 Possibly this should be done via a set/show command. */
3323 overlay_off_command (char *args
, int from_tty
)
3325 overlay_debugging
= ovly_off
;
3326 disable_overlay_breakpoints ();
3328 printf_unfiltered (_("Overlay debugging disabled."));
3332 overlay_load_command (char *args
, int from_tty
)
3334 struct gdbarch
*gdbarch
= get_current_arch ();
3336 if (gdbarch_overlay_update_p (gdbarch
))
3337 gdbarch_overlay_update (gdbarch
, NULL
);
3339 error (_("This target does not know how to read its overlay state."));
3342 /* Function: overlay_command
3343 A place-holder for a mis-typed command. */
3345 /* Command list chain containing all defined "overlay" subcommands. */
3346 struct cmd_list_element
*overlaylist
;
3349 overlay_command (char *args
, int from_tty
)
3352 ("\"overlay\" must be followed by the name of an overlay command.\n");
3353 help_list (overlaylist
, "overlay ", -1, gdb_stdout
);
3357 /* Target Overlays for the "Simplest" overlay manager:
3359 This is GDB's default target overlay layer. It works with the
3360 minimal overlay manager supplied as an example by Cygnus. The
3361 entry point is via a function pointer "gdbarch_overlay_update",
3362 so targets that use a different runtime overlay manager can
3363 substitute their own overlay_update function and take over the
3366 The overlay_update function pokes around in the target's data structures
3367 to see what overlays are mapped, and updates GDB's overlay mapping with
3370 In this simple implementation, the target data structures are as follows:
3371 unsigned _novlys; /# number of overlay sections #/
3372 unsigned _ovly_table[_novlys][4] = {
3373 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
3374 {..., ..., ..., ...},
3376 unsigned _novly_regions; /# number of overlay regions #/
3377 unsigned _ovly_region_table[_novly_regions][3] = {
3378 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
3381 These functions will attempt to update GDB's mappedness state in the
3382 symbol section table, based on the target's mappedness state.
3384 To do this, we keep a cached copy of the target's _ovly_table, and
3385 attempt to detect when the cached copy is invalidated. The main
3386 entry point is "simple_overlay_update(SECT), which looks up SECT in
3387 the cached table and re-reads only the entry for that section from
3388 the target (whenever possible). */
3390 /* Cached, dynamically allocated copies of the target data structures: */
3391 static unsigned (*cache_ovly_table
)[4] = 0;
3392 static unsigned cache_novlys
= 0;
3393 static CORE_ADDR cache_ovly_table_base
= 0;
3396 VMA
, SIZE
, LMA
, MAPPED
3399 /* Throw away the cached copy of _ovly_table. */
3401 simple_free_overlay_table (void)
3403 if (cache_ovly_table
)
3404 xfree (cache_ovly_table
);
3406 cache_ovly_table
= NULL
;
3407 cache_ovly_table_base
= 0;
3410 /* Read an array of ints of size SIZE from the target into a local buffer.
3411 Convert to host order. int LEN is number of ints. */
3413 read_target_long_array (CORE_ADDR memaddr
, unsigned int *myaddr
,
3414 int len
, int size
, enum bfd_endian byte_order
)
3416 /* FIXME (alloca): Not safe if array is very large. */
3417 gdb_byte
*buf
= alloca (len
* size
);
3420 read_memory (memaddr
, buf
, len
* size
);
3421 for (i
= 0; i
< len
; i
++)
3422 myaddr
[i
] = extract_unsigned_integer (size
* i
+ buf
, size
, byte_order
);
3425 /* Find and grab a copy of the target _ovly_table
3426 (and _novlys, which is needed for the table's size). */
3428 simple_read_overlay_table (void)
3430 struct minimal_symbol
*novlys_msym
, *ovly_table_msym
;
3431 struct gdbarch
*gdbarch
;
3433 enum bfd_endian byte_order
;
3435 simple_free_overlay_table ();
3436 novlys_msym
= lookup_minimal_symbol ("_novlys", NULL
, NULL
);
3439 error (_("Error reading inferior's overlay table: "
3440 "couldn't find `_novlys' variable\n"
3441 "in inferior. Use `overlay manual' mode."));
3445 ovly_table_msym
= lookup_minimal_symbol ("_ovly_table", NULL
, NULL
);
3446 if (! ovly_table_msym
)
3448 error (_("Error reading inferior's overlay table: couldn't find "
3449 "`_ovly_table' array\n"
3450 "in inferior. Use `overlay manual' mode."));
3454 gdbarch
= get_objfile_arch (msymbol_objfile (ovly_table_msym
));
3455 word_size
= gdbarch_long_bit (gdbarch
) / TARGET_CHAR_BIT
;
3456 byte_order
= gdbarch_byte_order (gdbarch
);
3458 cache_novlys
= read_memory_integer (SYMBOL_VALUE_ADDRESS (novlys_msym
),
3461 = (void *) xmalloc (cache_novlys
* sizeof (*cache_ovly_table
));
3462 cache_ovly_table_base
= SYMBOL_VALUE_ADDRESS (ovly_table_msym
);
3463 read_target_long_array (cache_ovly_table_base
,
3464 (unsigned int *) cache_ovly_table
,
3465 cache_novlys
* 4, word_size
, byte_order
);
3467 return 1; /* SUCCESS */
3470 /* Function: simple_overlay_update_1
3471 A helper function for simple_overlay_update. Assuming a cached copy
3472 of _ovly_table exists, look through it to find an entry whose vma,
3473 lma and size match those of OSECT. Re-read the entry and make sure
3474 it still matches OSECT (else the table may no longer be valid).
3475 Set OSECT's mapped state to match the entry. Return: 1 for
3476 success, 0 for failure. */
3479 simple_overlay_update_1 (struct obj_section
*osect
)
3482 bfd
*obfd
= osect
->objfile
->obfd
;
3483 asection
*bsect
= osect
->the_bfd_section
;
3484 struct gdbarch
*gdbarch
= get_objfile_arch (osect
->objfile
);
3485 int word_size
= gdbarch_long_bit (gdbarch
) / TARGET_CHAR_BIT
;
3486 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
3488 size
= bfd_get_section_size (osect
->the_bfd_section
);
3489 for (i
= 0; i
< cache_novlys
; i
++)
3490 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3491 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3492 /* && cache_ovly_table[i][SIZE] == size */ )
3494 read_target_long_array (cache_ovly_table_base
+ i
* word_size
,
3495 (unsigned int *) cache_ovly_table
[i
],
3496 4, word_size
, byte_order
);
3497 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3498 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3499 /* && cache_ovly_table[i][SIZE] == size */ )
3501 osect
->ovly_mapped
= cache_ovly_table
[i
][MAPPED
];
3504 else /* Warning! Warning! Target's ovly table has changed! */
3510 /* Function: simple_overlay_update
3511 If OSECT is NULL, then update all sections' mapped state
3512 (after re-reading the entire target _ovly_table).
3513 If OSECT is non-NULL, then try to find a matching entry in the
3514 cached ovly_table and update only OSECT's mapped state.
3515 If a cached entry can't be found or the cache isn't valid, then
3516 re-read the entire cache, and go ahead and update all sections. */
3519 simple_overlay_update (struct obj_section
*osect
)
3521 struct objfile
*objfile
;
3523 /* Were we given an osect to look up? NULL means do all of them. */
3525 /* Have we got a cached copy of the target's overlay table? */
3526 if (cache_ovly_table
!= NULL
)
3528 /* Does its cached location match what's currently in the
3530 struct minimal_symbol
*minsym
3531 = lookup_minimal_symbol ("_ovly_table", NULL
, NULL
);
3534 error (_("Error reading inferior's overlay table: couldn't "
3535 "find `_ovly_table' array\n"
3536 "in inferior. Use `overlay manual' mode."));
3538 if (cache_ovly_table_base
== SYMBOL_VALUE_ADDRESS (minsym
))
3539 /* Then go ahead and try to look up this single section in
3541 if (simple_overlay_update_1 (osect
))
3542 /* Found it! We're done. */
3546 /* Cached table no good: need to read the entire table anew.
3547 Or else we want all the sections, in which case it's actually
3548 more efficient to read the whole table in one block anyway. */
3550 if (! simple_read_overlay_table ())
3553 /* Now may as well update all sections, even if only one was requested. */
3554 ALL_OBJSECTIONS (objfile
, osect
)
3555 if (section_is_overlay (osect
))
3558 bfd
*obfd
= osect
->objfile
->obfd
;
3559 asection
*bsect
= osect
->the_bfd_section
;
3561 size
= bfd_get_section_size (bsect
);
3562 for (i
= 0; i
< cache_novlys
; i
++)
3563 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3564 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3565 /* && cache_ovly_table[i][SIZE] == size */ )
3566 { /* obj_section matches i'th entry in ovly_table. */
3567 osect
->ovly_mapped
= cache_ovly_table
[i
][MAPPED
];
3568 break; /* finished with inner for loop: break out. */
3573 /* Set the output sections and output offsets for section SECTP in
3574 ABFD. The relocation code in BFD will read these offsets, so we
3575 need to be sure they're initialized. We map each section to itself,
3576 with no offset; this means that SECTP->vma will be honored. */
3579 symfile_dummy_outputs (bfd
*abfd
, asection
*sectp
, void *dummy
)
3581 sectp
->output_section
= sectp
;
3582 sectp
->output_offset
= 0;
3585 /* Default implementation for sym_relocate. */
3589 default_symfile_relocate (struct objfile
*objfile
, asection
*sectp
,
3592 bfd
*abfd
= objfile
->obfd
;
3594 /* We're only interested in sections with relocation
3596 if ((sectp
->flags
& SEC_RELOC
) == 0)
3599 /* We will handle section offsets properly elsewhere, so relocate as if
3600 all sections begin at 0. */
3601 bfd_map_over_sections (abfd
, symfile_dummy_outputs
, NULL
);
3603 return bfd_simple_get_relocated_section_contents (abfd
, sectp
, buf
, NULL
);
3606 /* Relocate the contents of a debug section SECTP in ABFD. The
3607 contents are stored in BUF if it is non-NULL, or returned in a
3608 malloc'd buffer otherwise.
3610 For some platforms and debug info formats, shared libraries contain
3611 relocations against the debug sections (particularly for DWARF-2;
3612 one affected platform is PowerPC GNU/Linux, although it depends on
3613 the version of the linker in use). Also, ELF object files naturally
3614 have unresolved relocations for their debug sections. We need to apply
3615 the relocations in order to get the locations of symbols correct.
3616 Another example that may require relocation processing, is the
3617 DWARF-2 .eh_frame section in .o files, although it isn't strictly a
3621 symfile_relocate_debug_section (struct objfile
*objfile
,
3622 asection
*sectp
, bfd_byte
*buf
)
3624 gdb_assert (objfile
->sf
->sym_relocate
);
3626 return (*objfile
->sf
->sym_relocate
) (objfile
, sectp
, buf
);
3629 struct symfile_segment_data
*
3630 get_symfile_segment_data (bfd
*abfd
)
3632 const struct sym_fns
*sf
= find_sym_fns (abfd
);
3637 return sf
->sym_segments (abfd
);
3641 free_symfile_segment_data (struct symfile_segment_data
*data
)
3643 xfree (data
->segment_bases
);
3644 xfree (data
->segment_sizes
);
3645 xfree (data
->segment_info
);
3651 - DATA, containing segment addresses from the object file ABFD, and
3652 the mapping from ABFD's sections onto the segments that own them,
3654 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual
3655 segment addresses reported by the target,
3656 store the appropriate offsets for each section in OFFSETS.
3658 If there are fewer entries in SEGMENT_BASES than there are segments
3659 in DATA, then apply SEGMENT_BASES' last entry to all the segments.
3661 If there are more entries, then ignore the extra. The target may
3662 not be able to distinguish between an empty data segment and a
3663 missing data segment; a missing text segment is less plausible. */
3665 symfile_map_offsets_to_segments (bfd
*abfd
, struct symfile_segment_data
*data
,
3666 struct section_offsets
*offsets
,
3667 int num_segment_bases
,
3668 const CORE_ADDR
*segment_bases
)
3673 /* It doesn't make sense to call this function unless you have some
3674 segment base addresses. */
3675 gdb_assert (num_segment_bases
> 0);
3677 /* If we do not have segment mappings for the object file, we
3678 can not relocate it by segments. */
3679 gdb_assert (data
!= NULL
);
3680 gdb_assert (data
->num_segments
> 0);
3682 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
3684 int which
= data
->segment_info
[i
];
3686 gdb_assert (0 <= which
&& which
<= data
->num_segments
);
3688 /* Don't bother computing offsets for sections that aren't
3689 loaded as part of any segment. */
3693 /* Use the last SEGMENT_BASES entry as the address of any extra
3694 segments mentioned in DATA->segment_info. */
3695 if (which
> num_segment_bases
)
3696 which
= num_segment_bases
;
3698 offsets
->offsets
[i
] = (segment_bases
[which
- 1]
3699 - data
->segment_bases
[which
- 1]);
3706 symfile_find_segment_sections (struct objfile
*objfile
)
3708 bfd
*abfd
= objfile
->obfd
;
3711 struct symfile_segment_data
*data
;
3713 data
= get_symfile_segment_data (objfile
->obfd
);
3717 if (data
->num_segments
!= 1 && data
->num_segments
!= 2)
3719 free_symfile_segment_data (data
);
3723 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
3725 int which
= data
->segment_info
[i
];
3729 if (objfile
->sect_index_text
== -1)
3730 objfile
->sect_index_text
= sect
->index
;
3732 if (objfile
->sect_index_rodata
== -1)
3733 objfile
->sect_index_rodata
= sect
->index
;
3735 else if (which
== 2)
3737 if (objfile
->sect_index_data
== -1)
3738 objfile
->sect_index_data
= sect
->index
;
3740 if (objfile
->sect_index_bss
== -1)
3741 objfile
->sect_index_bss
= sect
->index
;
3745 free_symfile_segment_data (data
);
3749 _initialize_symfile (void)
3751 struct cmd_list_element
*c
;
3753 c
= add_cmd ("symbol-file", class_files
, symbol_file_command
, _("\
3754 Load symbol table from executable file FILE.\n\
3755 The `file' command can also load symbol tables, as well as setting the file\n\
3756 to execute."), &cmdlist
);
3757 set_cmd_completer (c
, filename_completer
);
3759 c
= add_cmd ("add-symbol-file", class_files
, add_symbol_file_command
, _("\
3760 Load symbols from FILE, assuming FILE has been dynamically loaded.\n\
3761 Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR>\
3762 ...]\nADDR is the starting address of the file's text.\n\
3763 The optional arguments are section-name section-address pairs and\n\
3764 should be specified if the data and bss segments are not contiguous\n\
3765 with the text. SECT is a section name to be loaded at SECT_ADDR."),
3767 set_cmd_completer (c
, filename_completer
);
3769 c
= add_cmd ("load", class_files
, load_command
, _("\
3770 Dynamically load FILE into the running program, and record its symbols\n\
3771 for access from GDB.\n\
3772 A load OFFSET may also be given."), &cmdlist
);
3773 set_cmd_completer (c
, filename_completer
);
3775 add_setshow_boolean_cmd ("symbol-reloading", class_support
,
3776 &symbol_reloading
, _("\
3777 Set dynamic symbol table reloading multiple times in one run."), _("\
3778 Show dynamic symbol table reloading multiple times in one run."), NULL
,
3780 show_symbol_reloading
,
3781 &setlist
, &showlist
);
3783 add_prefix_cmd ("overlay", class_support
, overlay_command
,
3784 _("Commands for debugging overlays."), &overlaylist
,
3785 "overlay ", 0, &cmdlist
);
3787 add_com_alias ("ovly", "overlay", class_alias
, 1);
3788 add_com_alias ("ov", "overlay", class_alias
, 1);
3790 add_cmd ("map-overlay", class_support
, map_overlay_command
,
3791 _("Assert that an overlay section is mapped."), &overlaylist
);
3793 add_cmd ("unmap-overlay", class_support
, unmap_overlay_command
,
3794 _("Assert that an overlay section is unmapped."), &overlaylist
);
3796 add_cmd ("list-overlays", class_support
, list_overlays_command
,
3797 _("List mappings of overlay sections."), &overlaylist
);
3799 add_cmd ("manual", class_support
, overlay_manual_command
,
3800 _("Enable overlay debugging."), &overlaylist
);
3801 add_cmd ("off", class_support
, overlay_off_command
,
3802 _("Disable overlay debugging."), &overlaylist
);
3803 add_cmd ("auto", class_support
, overlay_auto_command
,
3804 _("Enable automatic overlay debugging."), &overlaylist
);
3805 add_cmd ("load-target", class_support
, overlay_load_command
,
3806 _("Read the overlay mapping state from the target."), &overlaylist
);
3808 /* Filename extension to source language lookup table: */
3809 init_filename_language_table ();
3810 add_setshow_string_noescape_cmd ("extension-language", class_files
,
3812 Set mapping between filename extension and source language."), _("\
3813 Show mapping between filename extension and source language."), _("\
3814 Usage: set extension-language .foo bar"),
3815 set_ext_lang_command
,
3817 &setlist
, &showlist
);
3819 add_info ("extensions", info_ext_lang_command
,
3820 _("All filename extensions associated with a source language."));
3822 add_setshow_optional_filename_cmd ("debug-file-directory", class_support
,
3823 &debug_file_directory
, _("\
3824 Set the directories where separate debug symbols are searched for."), _("\
3825 Show the directories where separate debug symbols are searched for."), _("\
3826 Separate debug symbols are first searched for in the same\n\
3827 directory as the binary, then in the `" DEBUG_SUBDIRECTORY
"' subdirectory,\n\
3828 and lastly at the path of the directory of the binary with\n\
3829 each global debug-file-directory component prepended."),
3831 show_debug_file_directory
,
3832 &setlist
, &showlist
);