1 /* Generic symbol file reading for the GNU debugger, GDB.
3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
5 Free Software Foundation, Inc.
7 Contributed by Cygnus Support, using pieces from other GDB modules.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 #include "arch-utils.h"
37 #include "breakpoint.h"
39 #include "complaints.h"
43 #include "filenames.h" /* for DOSish file names */
44 #include "gdb-stabs.h"
45 #include "gdb_obstack.h"
46 #include "completer.h"
49 #include "readline/readline.h"
50 #include "gdb_assert.h"
54 #include "parser-defs.h"
61 #include <sys/types.h>
63 #include "gdb_string.h"
71 int (*deprecated_ui_load_progress_hook
) (const char *section
,
73 void (*deprecated_show_load_progress
) (const char *section
,
74 unsigned long section_sent
,
75 unsigned long section_size
,
76 unsigned long total_sent
,
77 unsigned long total_size
);
78 void (*deprecated_pre_add_symbol_hook
) (const char *);
79 void (*deprecated_post_add_symbol_hook
) (void);
81 static void clear_symtab_users_cleanup (void *ignore
);
83 /* Global variables owned by this file. */
84 int readnow_symbol_files
; /* Read full symbols immediately. */
86 /* External variables and functions referenced. */
88 extern void report_transfer_performance (unsigned long, time_t, time_t);
90 /* Functions this file defines. */
92 static void load_command (char *, int);
94 static void symbol_file_add_main_1 (char *args
, int from_tty
, int flags
);
96 static void add_symbol_file_command (char *, int);
98 bfd
*symfile_bfd_open (char *);
100 int get_section_index (struct objfile
*, char *);
102 static const struct sym_fns
*find_sym_fns (bfd
*);
104 static void decrement_reading_symtab (void *);
106 static void overlay_invalidate_all (void);
108 void list_overlays_command (char *, int);
110 void map_overlay_command (char *, int);
112 void unmap_overlay_command (char *, int);
114 static void overlay_auto_command (char *, int);
116 static void overlay_manual_command (char *, int);
118 static void overlay_off_command (char *, int);
120 static void overlay_load_command (char *, int);
122 static void overlay_command (char *, int);
124 static void simple_free_overlay_table (void);
126 static void read_target_long_array (CORE_ADDR
, unsigned int *, int, int,
129 static int simple_read_overlay_table (void);
131 static int simple_overlay_update_1 (struct obj_section
*);
133 static void add_filename_language (char *ext
, enum language lang
);
135 static void info_ext_lang_command (char *args
, int from_tty
);
137 static void init_filename_language_table (void);
139 static void symfile_find_segment_sections (struct objfile
*objfile
);
141 void _initialize_symfile (void);
143 /* List of all available sym_fns. On gdb startup, each object file reader
144 calls add_symtab_fns() to register information on each format it is
147 typedef const struct sym_fns
*sym_fns_ptr
;
148 DEF_VEC_P (sym_fns_ptr
);
150 static VEC (sym_fns_ptr
) *symtab_fns
= NULL
;
152 /* Flag for whether user will be reloading symbols multiple times.
153 Defaults to ON for VxWorks, otherwise OFF. */
155 #ifdef SYMBOL_RELOADING_DEFAULT
156 int symbol_reloading
= SYMBOL_RELOADING_DEFAULT
;
158 int symbol_reloading
= 0;
161 show_symbol_reloading (struct ui_file
*file
, int from_tty
,
162 struct cmd_list_element
*c
, const char *value
)
164 fprintf_filtered (file
, _("Dynamic symbol table reloading "
165 "multiple times in one run is %s.\n"),
169 /* If non-zero, shared library symbols will be added automatically
170 when the inferior is created, new libraries are loaded, or when
171 attaching to the inferior. This is almost always what users will
172 want to have happen; but for very large programs, the startup time
173 will be excessive, and so if this is a problem, the user can clear
174 this flag and then add the shared library symbols as needed. Note
175 that there is a potential for confusion, since if the shared
176 library symbols are not loaded, commands like "info fun" will *not*
177 report all the functions that are actually present. */
179 int auto_solib_add
= 1;
182 /* Make a null terminated copy of the string at PTR with SIZE characters in
183 the obstack pointed to by OBSTACKP . Returns the address of the copy.
184 Note that the string at PTR does not have to be null terminated, I.e. it
185 may be part of a larger string and we are only saving a substring. */
188 obsavestring (const char *ptr
, int size
, struct obstack
*obstackp
)
190 char *p
= (char *) obstack_alloc (obstackp
, size
+ 1);
191 /* Open-coded memcpy--saves function call time. These strings are usually
192 short. FIXME: Is this really still true with a compiler that can
195 const char *p1
= ptr
;
197 const char *end
= ptr
+ size
;
206 /* Concatenate NULL terminated variable argument list of `const char *'
207 strings; return the new string. Space is found in the OBSTACKP.
208 Argument list must be terminated by a sentinel expression `(char *)
212 obconcat (struct obstack
*obstackp
, ...)
216 va_start (ap
, obstackp
);
219 const char *s
= va_arg (ap
, const char *);
224 obstack_grow_str (obstackp
, s
);
227 obstack_1grow (obstackp
, 0);
229 return obstack_finish (obstackp
);
232 /* True if we are reading a symbol table. */
234 int currently_reading_symtab
= 0;
237 decrement_reading_symtab (void *dummy
)
239 currently_reading_symtab
--;
242 /* Increment currently_reading_symtab and return a cleanup that can be
243 used to decrement it. */
245 increment_reading_symtab (void)
247 ++currently_reading_symtab
;
248 return make_cleanup (decrement_reading_symtab
, NULL
);
251 /* Remember the lowest-addressed loadable section we've seen.
252 This function is called via bfd_map_over_sections.
254 In case of equal vmas, the section with the largest size becomes the
255 lowest-addressed loadable section.
257 If the vmas and sizes are equal, the last section is considered the
258 lowest-addressed loadable section. */
261 find_lowest_section (bfd
*abfd
, asection
*sect
, void *obj
)
263 asection
**lowest
= (asection
**) obj
;
265 if (0 == (bfd_get_section_flags (abfd
, sect
) & (SEC_ALLOC
| SEC_LOAD
)))
268 *lowest
= sect
; /* First loadable section */
269 else if (bfd_section_vma (abfd
, *lowest
) > bfd_section_vma (abfd
, sect
))
270 *lowest
= sect
; /* A lower loadable section */
271 else if (bfd_section_vma (abfd
, *lowest
) == bfd_section_vma (abfd
, sect
)
272 && (bfd_section_size (abfd
, (*lowest
))
273 <= bfd_section_size (abfd
, sect
)))
277 /* Create a new section_addr_info, with room for NUM_SECTIONS. */
279 struct section_addr_info
*
280 alloc_section_addr_info (size_t num_sections
)
282 struct section_addr_info
*sap
;
285 size
= (sizeof (struct section_addr_info
)
286 + sizeof (struct other_sections
) * (num_sections
- 1));
287 sap
= (struct section_addr_info
*) xmalloc (size
);
288 memset (sap
, 0, size
);
289 sap
->num_sections
= num_sections
;
294 /* Build (allocate and populate) a section_addr_info struct from
295 an existing section table. */
297 extern struct section_addr_info
*
298 build_section_addr_info_from_section_table (const struct target_section
*start
,
299 const struct target_section
*end
)
301 struct section_addr_info
*sap
;
302 const struct target_section
*stp
;
305 sap
= alloc_section_addr_info (end
- start
);
307 for (stp
= start
, oidx
= 0; stp
!= end
; stp
++)
309 if (bfd_get_section_flags (stp
->bfd
,
310 stp
->the_bfd_section
) & (SEC_ALLOC
| SEC_LOAD
)
311 && oidx
< end
- start
)
313 sap
->other
[oidx
].addr
= stp
->addr
;
314 sap
->other
[oidx
].name
315 = xstrdup (bfd_section_name (stp
->bfd
, stp
->the_bfd_section
));
316 sap
->other
[oidx
].sectindex
= stp
->the_bfd_section
->index
;
324 /* Create a section_addr_info from section offsets in ABFD. */
326 static struct section_addr_info
*
327 build_section_addr_info_from_bfd (bfd
*abfd
)
329 struct section_addr_info
*sap
;
331 struct bfd_section
*sec
;
333 sap
= alloc_section_addr_info (bfd_count_sections (abfd
));
334 for (i
= 0, sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
335 if (bfd_get_section_flags (abfd
, sec
) & (SEC_ALLOC
| SEC_LOAD
))
337 sap
->other
[i
].addr
= bfd_get_section_vma (abfd
, sec
);
338 sap
->other
[i
].name
= xstrdup (bfd_get_section_name (abfd
, sec
));
339 sap
->other
[i
].sectindex
= sec
->index
;
345 /* Create a section_addr_info from section offsets in OBJFILE. */
347 struct section_addr_info
*
348 build_section_addr_info_from_objfile (const struct objfile
*objfile
)
350 struct section_addr_info
*sap
;
353 /* Before reread_symbols gets rewritten it is not safe to call:
354 gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd));
356 sap
= build_section_addr_info_from_bfd (objfile
->obfd
);
357 for (i
= 0; i
< sap
->num_sections
&& sap
->other
[i
].name
; i
++)
359 int sectindex
= sap
->other
[i
].sectindex
;
361 sap
->other
[i
].addr
+= objfile
->section_offsets
->offsets
[sectindex
];
366 /* Free all memory allocated by build_section_addr_info_from_section_table. */
369 free_section_addr_info (struct section_addr_info
*sap
)
373 for (idx
= 0; idx
< sap
->num_sections
; idx
++)
374 if (sap
->other
[idx
].name
)
375 xfree (sap
->other
[idx
].name
);
380 /* Initialize OBJFILE's sect_index_* members. */
382 init_objfile_sect_indices (struct objfile
*objfile
)
387 sect
= bfd_get_section_by_name (objfile
->obfd
, ".text");
389 objfile
->sect_index_text
= sect
->index
;
391 sect
= bfd_get_section_by_name (objfile
->obfd
, ".data");
393 objfile
->sect_index_data
= sect
->index
;
395 sect
= bfd_get_section_by_name (objfile
->obfd
, ".bss");
397 objfile
->sect_index_bss
= sect
->index
;
399 sect
= bfd_get_section_by_name (objfile
->obfd
, ".rodata");
401 objfile
->sect_index_rodata
= sect
->index
;
403 /* This is where things get really weird... We MUST have valid
404 indices for the various sect_index_* members or gdb will abort.
405 So if for example, there is no ".text" section, we have to
406 accomodate that. First, check for a file with the standard
407 one or two segments. */
409 symfile_find_segment_sections (objfile
);
411 /* Except when explicitly adding symbol files at some address,
412 section_offsets contains nothing but zeros, so it doesn't matter
413 which slot in section_offsets the individual sect_index_* members
414 index into. So if they are all zero, it is safe to just point
415 all the currently uninitialized indices to the first slot. But
416 beware: if this is the main executable, it may be relocated
417 later, e.g. by the remote qOffsets packet, and then this will
418 be wrong! That's why we try segments first. */
420 for (i
= 0; i
< objfile
->num_sections
; i
++)
422 if (ANOFFSET (objfile
->section_offsets
, i
) != 0)
427 if (i
== objfile
->num_sections
)
429 if (objfile
->sect_index_text
== -1)
430 objfile
->sect_index_text
= 0;
431 if (objfile
->sect_index_data
== -1)
432 objfile
->sect_index_data
= 0;
433 if (objfile
->sect_index_bss
== -1)
434 objfile
->sect_index_bss
= 0;
435 if (objfile
->sect_index_rodata
== -1)
436 objfile
->sect_index_rodata
= 0;
440 /* The arguments to place_section. */
442 struct place_section_arg
444 struct section_offsets
*offsets
;
448 /* Find a unique offset to use for loadable section SECT if
449 the user did not provide an offset. */
452 place_section (bfd
*abfd
, asection
*sect
, void *obj
)
454 struct place_section_arg
*arg
= obj
;
455 CORE_ADDR
*offsets
= arg
->offsets
->offsets
, start_addr
;
457 ULONGEST align
= ((ULONGEST
) 1) << bfd_get_section_alignment (abfd
, sect
);
459 /* We are only interested in allocated sections. */
460 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
463 /* If the user specified an offset, honor it. */
464 if (offsets
[sect
->index
] != 0)
467 /* Otherwise, let's try to find a place for the section. */
468 start_addr
= (arg
->lowest
+ align
- 1) & -align
;
475 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
; cur_sec
= cur_sec
->next
)
477 int indx
= cur_sec
->index
;
479 /* We don't need to compare against ourself. */
483 /* We can only conflict with allocated sections. */
484 if ((bfd_get_section_flags (abfd
, cur_sec
) & SEC_ALLOC
) == 0)
487 /* If the section offset is 0, either the section has not been placed
488 yet, or it was the lowest section placed (in which case LOWEST
489 will be past its end). */
490 if (offsets
[indx
] == 0)
493 /* If this section would overlap us, then we must move up. */
494 if (start_addr
+ bfd_get_section_size (sect
) > offsets
[indx
]
495 && start_addr
< offsets
[indx
] + bfd_get_section_size (cur_sec
))
497 start_addr
= offsets
[indx
] + bfd_get_section_size (cur_sec
);
498 start_addr
= (start_addr
+ align
- 1) & -align
;
503 /* Otherwise, we appear to be OK. So far. */
508 offsets
[sect
->index
] = start_addr
;
509 arg
->lowest
= start_addr
+ bfd_get_section_size (sect
);
512 /* Store struct section_addr_info as prepared (made relative and with SECTINDEX
513 filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS
517 relative_addr_info_to_section_offsets (struct section_offsets
*section_offsets
,
519 struct section_addr_info
*addrs
)
523 memset (section_offsets
, 0, SIZEOF_N_SECTION_OFFSETS (num_sections
));
525 /* Now calculate offsets for section that were specified by the caller. */
526 for (i
= 0; i
< addrs
->num_sections
&& addrs
->other
[i
].name
; i
++)
528 struct other_sections
*osp
;
530 osp
= &addrs
->other
[i
];
531 if (osp
->sectindex
== -1)
534 /* Record all sections in offsets. */
535 /* The section_offsets in the objfile are here filled in using
537 section_offsets
->offsets
[osp
->sectindex
] = osp
->addr
;
541 /* Transform section name S for a name comparison. prelink can split section
542 `.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly
543 prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address
544 of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss'
545 (`.sbss') section has invalid (increased) virtual address. */
548 addr_section_name (const char *s
)
550 if (strcmp (s
, ".dynbss") == 0)
552 if (strcmp (s
, ".sdynbss") == 0)
558 /* qsort comparator for addrs_section_sort. Sort entries in ascending order by
559 their (name, sectindex) pair. sectindex makes the sort by name stable. */
562 addrs_section_compar (const void *ap
, const void *bp
)
564 const struct other_sections
*a
= *((struct other_sections
**) ap
);
565 const struct other_sections
*b
= *((struct other_sections
**) bp
);
566 int retval
, a_idx
, b_idx
;
568 retval
= strcmp (addr_section_name (a
->name
), addr_section_name (b
->name
));
572 return a
->sectindex
- b
->sectindex
;
575 /* Provide sorted array of pointers to sections of ADDRS. The array is
576 terminated by NULL. Caller is responsible to call xfree for it. */
578 static struct other_sections
**
579 addrs_section_sort (struct section_addr_info
*addrs
)
581 struct other_sections
**array
;
584 /* `+ 1' for the NULL terminator. */
585 array
= xmalloc (sizeof (*array
) * (addrs
->num_sections
+ 1));
586 for (i
= 0; i
< addrs
->num_sections
&& addrs
->other
[i
].name
; i
++)
587 array
[i
] = &addrs
->other
[i
];
590 qsort (array
, i
, sizeof (*array
), addrs_section_compar
);
595 /* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in
596 also SECTINDEXes specific to ABFD there. This function can be used to
597 rebase ADDRS to start referencing different BFD than before. */
600 addr_info_make_relative (struct section_addr_info
*addrs
, bfd
*abfd
)
602 asection
*lower_sect
;
603 CORE_ADDR lower_offset
;
605 struct cleanup
*my_cleanup
;
606 struct section_addr_info
*abfd_addrs
;
607 struct other_sections
**addrs_sorted
, **abfd_addrs_sorted
;
608 struct other_sections
**addrs_to_abfd_addrs
;
610 /* Find lowest loadable section to be used as starting point for
611 continguous sections. */
613 bfd_map_over_sections (abfd
, find_lowest_section
, &lower_sect
);
614 if (lower_sect
== NULL
)
616 warning (_("no loadable sections found in added symbol-file %s"),
617 bfd_get_filename (abfd
));
621 lower_offset
= bfd_section_vma (bfd_get_filename (abfd
), lower_sect
);
623 /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections
624 in ABFD. Section names are not unique - there can be multiple sections of
625 the same name. Also the sections of the same name do not have to be
626 adjacent to each other. Some sections may be present only in one of the
627 files. Even sections present in both files do not have to be in the same
630 Use stable sort by name for the sections in both files. Then linearly
631 scan both lists matching as most of the entries as possible. */
633 addrs_sorted
= addrs_section_sort (addrs
);
634 my_cleanup
= make_cleanup (xfree
, addrs_sorted
);
636 abfd_addrs
= build_section_addr_info_from_bfd (abfd
);
637 make_cleanup_free_section_addr_info (abfd_addrs
);
638 abfd_addrs_sorted
= addrs_section_sort (abfd_addrs
);
639 make_cleanup (xfree
, abfd_addrs_sorted
);
641 /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and
642 ABFD_ADDRS_SORTED. */
644 addrs_to_abfd_addrs
= xzalloc (sizeof (*addrs_to_abfd_addrs
)
645 * addrs
->num_sections
);
646 make_cleanup (xfree
, addrs_to_abfd_addrs
);
648 while (*addrs_sorted
)
650 const char *sect_name
= addr_section_name ((*addrs_sorted
)->name
);
652 while (*abfd_addrs_sorted
653 && strcmp (addr_section_name ((*abfd_addrs_sorted
)->name
),
657 if (*abfd_addrs_sorted
658 && strcmp (addr_section_name ((*abfd_addrs_sorted
)->name
),
663 /* Make the found item directly addressable from ADDRS. */
664 index_in_addrs
= *addrs_sorted
- addrs
->other
;
665 gdb_assert (addrs_to_abfd_addrs
[index_in_addrs
] == NULL
);
666 addrs_to_abfd_addrs
[index_in_addrs
] = *abfd_addrs_sorted
;
668 /* Never use the same ABFD entry twice. */
675 /* Calculate offsets for the loadable sections.
676 FIXME! Sections must be in order of increasing loadable section
677 so that contiguous sections can use the lower-offset!!!
679 Adjust offsets if the segments are not contiguous.
680 If the section is contiguous, its offset should be set to
681 the offset of the highest loadable section lower than it
682 (the loadable section directly below it in memory).
683 this_offset = lower_offset = lower_addr - lower_orig_addr */
685 for (i
= 0; i
< addrs
->num_sections
&& addrs
->other
[i
].name
; i
++)
687 struct other_sections
*sect
= addrs_to_abfd_addrs
[i
];
691 /* This is the index used by BFD. */
692 addrs
->other
[i
].sectindex
= sect
->sectindex
;
694 if (addrs
->other
[i
].addr
!= 0)
696 addrs
->other
[i
].addr
-= sect
->addr
;
697 lower_offset
= addrs
->other
[i
].addr
;
700 addrs
->other
[i
].addr
= lower_offset
;
704 /* addr_section_name transformation is not used for SECT_NAME. */
705 const char *sect_name
= addrs
->other
[i
].name
;
707 /* This section does not exist in ABFD, which is normally
708 unexpected and we want to issue a warning.
710 However, the ELF prelinker does create a few sections which are
711 marked in the main executable as loadable (they are loaded in
712 memory from the DYNAMIC segment) and yet are not present in
713 separate debug info files. This is fine, and should not cause
714 a warning. Shared libraries contain just the section
715 ".gnu.liblist" but it is not marked as loadable there. There is
716 no other way to identify them than by their name as the sections
717 created by prelink have no special flags.
719 For the sections `.bss' and `.sbss' see addr_section_name. */
721 if (!(strcmp (sect_name
, ".gnu.liblist") == 0
722 || strcmp (sect_name
, ".gnu.conflict") == 0
723 || (strcmp (sect_name
, ".bss") == 0
725 && strcmp (addrs
->other
[i
- 1].name
, ".dynbss") == 0
726 && addrs_to_abfd_addrs
[i
- 1] != NULL
)
727 || (strcmp (sect_name
, ".sbss") == 0
729 && strcmp (addrs
->other
[i
- 1].name
, ".sdynbss") == 0
730 && addrs_to_abfd_addrs
[i
- 1] != NULL
)))
731 warning (_("section %s not found in %s"), sect_name
,
732 bfd_get_filename (abfd
));
734 addrs
->other
[i
].addr
= 0;
735 addrs
->other
[i
].sectindex
= -1;
739 do_cleanups (my_cleanup
);
742 /* Parse the user's idea of an offset for dynamic linking, into our idea
743 of how to represent it for fast symbol reading. This is the default
744 version of the sym_fns.sym_offsets function for symbol readers that
745 don't need to do anything special. It allocates a section_offsets table
746 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
749 default_symfile_offsets (struct objfile
*objfile
,
750 struct section_addr_info
*addrs
)
752 objfile
->num_sections
= bfd_count_sections (objfile
->obfd
);
753 objfile
->section_offsets
= (struct section_offsets
*)
754 obstack_alloc (&objfile
->objfile_obstack
,
755 SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
));
756 relative_addr_info_to_section_offsets (objfile
->section_offsets
,
757 objfile
->num_sections
, addrs
);
759 /* For relocatable files, all loadable sections will start at zero.
760 The zero is meaningless, so try to pick arbitrary addresses such
761 that no loadable sections overlap. This algorithm is quadratic,
762 but the number of sections in a single object file is generally
764 if ((bfd_get_file_flags (objfile
->obfd
) & (EXEC_P
| DYNAMIC
)) == 0)
766 struct place_section_arg arg
;
767 bfd
*abfd
= objfile
->obfd
;
770 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
; cur_sec
= cur_sec
->next
)
771 /* We do not expect this to happen; just skip this step if the
772 relocatable file has a section with an assigned VMA. */
773 if (bfd_section_vma (abfd
, cur_sec
) != 0)
778 CORE_ADDR
*offsets
= objfile
->section_offsets
->offsets
;
780 /* Pick non-overlapping offsets for sections the user did not
782 arg
.offsets
= objfile
->section_offsets
;
784 bfd_map_over_sections (objfile
->obfd
, place_section
, &arg
);
786 /* Correctly filling in the section offsets is not quite
787 enough. Relocatable files have two properties that
788 (most) shared objects do not:
790 - Their debug information will contain relocations. Some
791 shared libraries do also, but many do not, so this can not
794 - If there are multiple code sections they will be loaded
795 at different relative addresses in memory than they are
796 in the objfile, since all sections in the file will start
799 Because GDB has very limited ability to map from an
800 address in debug info to the correct code section,
801 it relies on adding SECT_OFF_TEXT to things which might be
802 code. If we clear all the section offsets, and set the
803 section VMAs instead, then symfile_relocate_debug_section
804 will return meaningful debug information pointing at the
807 GDB has too many different data structures for section
808 addresses - a bfd, objfile, and so_list all have section
809 tables, as does exec_ops. Some of these could probably
812 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
;
813 cur_sec
= cur_sec
->next
)
815 if ((bfd_get_section_flags (abfd
, cur_sec
) & SEC_ALLOC
) == 0)
818 bfd_set_section_vma (abfd
, cur_sec
, offsets
[cur_sec
->index
]);
819 exec_set_section_address (bfd_get_filename (abfd
),
821 offsets
[cur_sec
->index
]);
822 offsets
[cur_sec
->index
] = 0;
827 /* Remember the bfd indexes for the .text, .data, .bss and
829 init_objfile_sect_indices (objfile
);
833 /* Divide the file into segments, which are individual relocatable units.
834 This is the default version of the sym_fns.sym_segments function for
835 symbol readers that do not have an explicit representation of segments.
836 It assumes that object files do not have segments, and fully linked
837 files have a single segment. */
839 struct symfile_segment_data
*
840 default_symfile_segments (bfd
*abfd
)
844 struct symfile_segment_data
*data
;
847 /* Relocatable files contain enough information to position each
848 loadable section independently; they should not be relocated
850 if ((bfd_get_file_flags (abfd
) & (EXEC_P
| DYNAMIC
)) == 0)
853 /* Make sure there is at least one loadable section in the file. */
854 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
856 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
864 low
= bfd_get_section_vma (abfd
, sect
);
865 high
= low
+ bfd_get_section_size (sect
);
867 data
= XZALLOC (struct symfile_segment_data
);
868 data
->num_segments
= 1;
869 data
->segment_bases
= XCALLOC (1, CORE_ADDR
);
870 data
->segment_sizes
= XCALLOC (1, CORE_ADDR
);
872 num_sections
= bfd_count_sections (abfd
);
873 data
->segment_info
= XCALLOC (num_sections
, int);
875 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
879 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
882 vma
= bfd_get_section_vma (abfd
, sect
);
885 if (vma
+ bfd_get_section_size (sect
) > high
)
886 high
= vma
+ bfd_get_section_size (sect
);
888 data
->segment_info
[i
] = 1;
891 data
->segment_bases
[0] = low
;
892 data
->segment_sizes
[0] = high
- low
;
897 /* Process a symbol file, as either the main file or as a dynamically
900 OBJFILE is where the symbols are to be read from.
902 ADDRS is the list of section load addresses. If the user has given
903 an 'add-symbol-file' command, then this is the list of offsets and
904 addresses he or she provided as arguments to the command; or, if
905 we're handling a shared library, these are the actual addresses the
906 sections are loaded at, according to the inferior's dynamic linker
907 (as gleaned by GDB's shared library code). We convert each address
908 into an offset from the section VMA's as it appears in the object
909 file, and then call the file's sym_offsets function to convert this
910 into a format-specific offset table --- a `struct section_offsets'.
911 If ADDRS is non-zero, OFFSETS must be zero.
913 OFFSETS is a table of section offsets already in the right
914 format-specific representation. NUM_OFFSETS is the number of
915 elements present in OFFSETS->offsets. If OFFSETS is non-zero, we
916 assume this is the proper table the call to sym_offsets described
917 above would produce. Instead of calling sym_offsets, we just dump
918 it right into objfile->section_offsets. (When we're re-reading
919 symbols from an objfile, we don't have the original load address
920 list any more; all we have is the section offset table.) If
921 OFFSETS is non-zero, ADDRS must be zero.
923 ADD_FLAGS encodes verbosity level, whether this is main symbol or
924 an extra symbol file such as dynamically loaded code, and wether
925 breakpoint reset should be deferred. */
928 syms_from_objfile (struct objfile
*objfile
,
929 struct section_addr_info
*addrs
,
930 struct section_offsets
*offsets
,
934 struct section_addr_info
*local_addr
= NULL
;
935 struct cleanup
*old_chain
;
936 const int mainline
= add_flags
& SYMFILE_MAINLINE
;
938 gdb_assert (! (addrs
&& offsets
));
940 init_entry_point_info (objfile
);
941 objfile
->sf
= find_sym_fns (objfile
->obfd
);
943 if (objfile
->sf
== NULL
)
944 return; /* No symbols. */
946 /* Make sure that partially constructed symbol tables will be cleaned up
947 if an error occurs during symbol reading. */
948 old_chain
= make_cleanup_free_objfile (objfile
);
950 /* If ADDRS and OFFSETS are both NULL, put together a dummy address
951 list. We now establish the convention that an addr of zero means
952 no load address was specified. */
953 if (! addrs
&& ! offsets
)
956 = alloc_section_addr_info (bfd_count_sections (objfile
->obfd
));
957 make_cleanup (xfree
, local_addr
);
961 /* Now either addrs or offsets is non-zero. */
965 /* We will modify the main symbol table, make sure that all its users
966 will be cleaned up if an error occurs during symbol reading. */
967 make_cleanup (clear_symtab_users_cleanup
, 0 /*ignore*/);
969 /* Since no error yet, throw away the old symbol table. */
971 if (symfile_objfile
!= NULL
)
973 free_objfile (symfile_objfile
);
974 gdb_assert (symfile_objfile
== NULL
);
977 /* Currently we keep symbols from the add-symbol-file command.
978 If the user wants to get rid of them, they should do "symbol-file"
979 without arguments first. Not sure this is the best behavior
982 (*objfile
->sf
->sym_new_init
) (objfile
);
985 /* Convert addr into an offset rather than an absolute address.
986 We find the lowest address of a loaded segment in the objfile,
987 and assume that <addr> is where that got loaded.
989 We no longer warn if the lowest section is not a text segment (as
990 happens for the PA64 port. */
991 if (addrs
&& addrs
->other
[0].name
)
992 addr_info_make_relative (addrs
, objfile
->obfd
);
994 /* Initialize symbol reading routines for this objfile, allow complaints to
995 appear for this new file, and record how verbose to be, then do the
996 initial symbol reading for this file. */
998 (*objfile
->sf
->sym_init
) (objfile
);
999 clear_complaints (&symfile_complaints
, 1, add_flags
& SYMFILE_VERBOSE
);
1002 (*objfile
->sf
->sym_offsets
) (objfile
, addrs
);
1005 size_t size
= SIZEOF_N_SECTION_OFFSETS (num_offsets
);
1007 /* Just copy in the offset table directly as given to us. */
1008 objfile
->num_sections
= num_offsets
;
1009 objfile
->section_offsets
1010 = ((struct section_offsets
*)
1011 obstack_alloc (&objfile
->objfile_obstack
, size
));
1012 memcpy (objfile
->section_offsets
, offsets
, size
);
1014 init_objfile_sect_indices (objfile
);
1017 (*objfile
->sf
->sym_read
) (objfile
, add_flags
);
1019 if ((add_flags
& SYMFILE_NO_READ
) == 0)
1020 require_partial_symbols (objfile
, 0);
1022 /* Discard cleanups as symbol reading was successful. */
1024 discard_cleanups (old_chain
);
1028 /* Perform required actions after either reading in the initial
1029 symbols for a new objfile, or mapping in the symbols from a reusable
1030 objfile. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
1033 new_symfile_objfile (struct objfile
*objfile
, int add_flags
)
1035 /* If this is the main symbol file we have to clean up all users of the
1036 old main symbol file. Otherwise it is sufficient to fixup all the
1037 breakpoints that may have been redefined by this symbol file. */
1038 if (add_flags
& SYMFILE_MAINLINE
)
1040 /* OK, make it the "real" symbol file. */
1041 symfile_objfile
= objfile
;
1043 clear_symtab_users (add_flags
);
1045 else if ((add_flags
& SYMFILE_DEFER_BP_RESET
) == 0)
1047 breakpoint_re_set ();
1050 /* We're done reading the symbol file; finish off complaints. */
1051 clear_complaints (&symfile_complaints
, 0, add_flags
& SYMFILE_VERBOSE
);
1054 /* Process a symbol file, as either the main file or as a dynamically
1057 ABFD is a BFD already open on the file, as from symfile_bfd_open.
1058 This BFD will be closed on error, and is always consumed by this function.
1060 ADD_FLAGS encodes verbosity, whether this is main symbol file or
1061 extra, such as dynamically loaded code, and what to do with breakpoins.
1063 ADDRS, OFFSETS, and NUM_OFFSETS are as described for
1064 syms_from_objfile, above.
1065 ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS.
1067 PARENT is the original objfile if ABFD is a separate debug info file.
1068 Otherwise PARENT is NULL.
1070 Upon success, returns a pointer to the objfile that was added.
1071 Upon failure, jumps back to command level (never returns). */
1073 static struct objfile
*
1074 symbol_file_add_with_addrs_or_offsets (bfd
*abfd
,
1076 struct section_addr_info
*addrs
,
1077 struct section_offsets
*offsets
,
1079 int flags
, struct objfile
*parent
)
1081 struct objfile
*objfile
;
1082 struct cleanup
*my_cleanups
;
1083 const char *name
= bfd_get_filename (abfd
);
1084 const int from_tty
= add_flags
& SYMFILE_VERBOSE
;
1085 const int mainline
= add_flags
& SYMFILE_MAINLINE
;
1086 const int should_print
= ((from_tty
|| info_verbose
)
1087 && (readnow_symbol_files
1088 || (add_flags
& SYMFILE_NO_READ
) == 0));
1090 if (readnow_symbol_files
)
1092 flags
|= OBJF_READNOW
;
1093 add_flags
&= ~SYMFILE_NO_READ
;
1096 my_cleanups
= make_cleanup_bfd_close (abfd
);
1098 /* Give user a chance to burp if we'd be
1099 interactively wiping out any existing symbols. */
1101 if ((have_full_symbols () || have_partial_symbols ())
1104 && !query (_("Load new symbol table from \"%s\"? "), name
))
1105 error (_("Not confirmed."));
1107 objfile
= allocate_objfile (abfd
, flags
| (mainline
? OBJF_MAINLINE
: 0));
1108 discard_cleanups (my_cleanups
);
1111 add_separate_debug_objfile (objfile
, parent
);
1113 /* We either created a new mapped symbol table, mapped an existing
1114 symbol table file which has not had initial symbol reading
1115 performed, or need to read an unmapped symbol table. */
1118 if (deprecated_pre_add_symbol_hook
)
1119 deprecated_pre_add_symbol_hook (name
);
1122 printf_unfiltered (_("Reading symbols from %s..."), name
);
1124 gdb_flush (gdb_stdout
);
1127 syms_from_objfile (objfile
, addrs
, offsets
, num_offsets
,
1130 /* We now have at least a partial symbol table. Check to see if the
1131 user requested that all symbols be read on initial access via either
1132 the gdb startup command line or on a per symbol file basis. Expand
1133 all partial symbol tables for this objfile if so. */
1135 if ((flags
& OBJF_READNOW
))
1139 printf_unfiltered (_("expanding to full symbols..."));
1141 gdb_flush (gdb_stdout
);
1145 objfile
->sf
->qf
->expand_all_symtabs (objfile
);
1148 if (should_print
&& !objfile_has_symbols (objfile
))
1151 printf_unfiltered (_("(no debugging symbols found)..."));
1157 if (deprecated_post_add_symbol_hook
)
1158 deprecated_post_add_symbol_hook ();
1160 printf_unfiltered (_("done.\n"));
1163 /* We print some messages regardless of whether 'from_tty ||
1164 info_verbose' is true, so make sure they go out at the right
1166 gdb_flush (gdb_stdout
);
1168 do_cleanups (my_cleanups
);
1170 if (objfile
->sf
== NULL
)
1172 observer_notify_new_objfile (objfile
);
1173 return objfile
; /* No symbols. */
1176 new_symfile_objfile (objfile
, add_flags
);
1178 observer_notify_new_objfile (objfile
);
1180 bfd_cache_close_all ();
1184 /* Add BFD as a separate debug file for OBJFILE. */
1187 symbol_file_add_separate (bfd
*bfd
, int symfile_flags
, struct objfile
*objfile
)
1189 struct objfile
*new_objfile
;
1190 struct section_addr_info
*sap
;
1191 struct cleanup
*my_cleanup
;
1193 /* Create section_addr_info. We can't directly use offsets from OBJFILE
1194 because sections of BFD may not match sections of OBJFILE and because
1195 vma may have been modified by tools such as prelink. */
1196 sap
= build_section_addr_info_from_objfile (objfile
);
1197 my_cleanup
= make_cleanup_free_section_addr_info (sap
);
1199 new_objfile
= symbol_file_add_with_addrs_or_offsets
1200 (bfd
, symfile_flags
,
1202 objfile
->flags
& (OBJF_REORDERED
| OBJF_SHARED
| OBJF_READNOW
1206 do_cleanups (my_cleanup
);
1209 /* Process the symbol file ABFD, as either the main file or as a
1210 dynamically loaded file.
1212 See symbol_file_add_with_addrs_or_offsets's comments for
1215 symbol_file_add_from_bfd (bfd
*abfd
, int add_flags
,
1216 struct section_addr_info
*addrs
,
1217 int flags
, struct objfile
*parent
)
1219 return symbol_file_add_with_addrs_or_offsets (abfd
, add_flags
, addrs
, 0, 0,
1224 /* Process a symbol file, as either the main file or as a dynamically
1225 loaded file. See symbol_file_add_with_addrs_or_offsets's comments
1228 symbol_file_add (char *name
, int add_flags
, struct section_addr_info
*addrs
,
1231 return symbol_file_add_from_bfd (symfile_bfd_open (name
), add_flags
, addrs
,
1236 /* Call symbol_file_add() with default values and update whatever is
1237 affected by the loading of a new main().
1238 Used when the file is supplied in the gdb command line
1239 and by some targets with special loading requirements.
1240 The auxiliary function, symbol_file_add_main_1(), has the flags
1241 argument for the switches that can only be specified in the symbol_file
1245 symbol_file_add_main (char *args
, int from_tty
)
1247 symbol_file_add_main_1 (args
, from_tty
, 0);
1251 symbol_file_add_main_1 (char *args
, int from_tty
, int flags
)
1253 const int add_flags
= SYMFILE_MAINLINE
| (from_tty
? SYMFILE_VERBOSE
: 0);
1254 symbol_file_add (args
, add_flags
, NULL
, flags
);
1256 /* Getting new symbols may change our opinion about
1257 what is frameless. */
1258 reinit_frame_cache ();
1260 set_initial_language ();
1264 symbol_file_clear (int from_tty
)
1266 if ((have_full_symbols () || have_partial_symbols ())
1269 ? !query (_("Discard symbol table from `%s'? "),
1270 symfile_objfile
->name
)
1271 : !query (_("Discard symbol table? "))))
1272 error (_("Not confirmed."));
1274 /* solib descriptors may have handles to objfiles. Wipe them before their
1275 objfiles get stale by free_all_objfiles. */
1276 no_shared_libraries (NULL
, from_tty
);
1278 free_all_objfiles ();
1280 gdb_assert (symfile_objfile
== NULL
);
1282 printf_unfiltered (_("No symbol file now.\n"));
1286 get_debug_link_info (struct objfile
*objfile
, unsigned long *crc32_out
)
1289 bfd_size_type debuglink_size
;
1290 unsigned long crc32
;
1294 sect
= bfd_get_section_by_name (objfile
->obfd
, ".gnu_debuglink");
1299 debuglink_size
= bfd_section_size (objfile
->obfd
, sect
);
1301 contents
= xmalloc (debuglink_size
);
1302 bfd_get_section_contents (objfile
->obfd
, sect
, contents
,
1303 (file_ptr
)0, (bfd_size_type
)debuglink_size
);
1305 /* Crc value is stored after the filename, aligned up to 4 bytes. */
1306 crc_offset
= strlen (contents
) + 1;
1307 crc_offset
= (crc_offset
+ 3) & ~3;
1309 crc32
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) (contents
+ crc_offset
));
1315 /* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and
1316 return 1. Otherwise print a warning and return 0. ABFD seek position is
1320 get_file_crc (bfd
*abfd
, unsigned long *file_crc_return
)
1322 unsigned long file_crc
= 0;
1324 if (bfd_seek (abfd
, 0, SEEK_SET
) != 0)
1326 warning (_("Problem reading \"%s\" for CRC: %s"),
1327 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
1333 gdb_byte buffer
[8 * 1024];
1334 bfd_size_type count
;
1336 count
= bfd_bread (buffer
, sizeof (buffer
), abfd
);
1337 if (count
== (bfd_size_type
) -1)
1339 warning (_("Problem reading \"%s\" for CRC: %s"),
1340 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
1345 file_crc
= gnu_debuglink_crc32 (file_crc
, buffer
, count
);
1348 *file_crc_return
= file_crc
;
1353 separate_debug_file_exists (const char *name
, unsigned long crc
,
1354 struct objfile
*parent_objfile
)
1356 unsigned long file_crc
;
1359 struct stat parent_stat
, abfd_stat
;
1360 int verified_as_different
;
1362 /* Find a separate debug info file as if symbols would be present in
1363 PARENT_OBJFILE itself this function would not be called. .gnu_debuglink
1364 section can contain just the basename of PARENT_OBJFILE without any
1365 ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where
1366 the separate debug infos with the same basename can exist. */
1368 if (filename_cmp (name
, parent_objfile
->name
) == 0)
1371 abfd
= bfd_open_maybe_remote (name
);
1376 /* Verify symlinks were not the cause of filename_cmp name difference above.
1378 Some operating systems, e.g. Windows, do not provide a meaningful
1379 st_ino; they always set it to zero. (Windows does provide a
1380 meaningful st_dev.) Do not indicate a duplicate library in that
1381 case. While there is no guarantee that a system that provides
1382 meaningful inode numbers will never set st_ino to zero, this is
1383 merely an optimization, so we do not need to worry about false
1386 if (bfd_stat (abfd
, &abfd_stat
) == 0
1387 && abfd_stat
.st_ino
!= 0
1388 && bfd_stat (parent_objfile
->obfd
, &parent_stat
) == 0)
1390 if (abfd_stat
.st_dev
== parent_stat
.st_dev
1391 && abfd_stat
.st_ino
== parent_stat
.st_ino
)
1396 verified_as_different
= 1;
1399 verified_as_different
= 0;
1401 file_crc_p
= get_file_crc (abfd
, &file_crc
);
1408 if (crc
!= file_crc
)
1410 /* If one (or both) the files are accessed for example the via "remote:"
1411 gdbserver way it does not support the bfd_stat operation. Verify
1412 whether those two files are not the same manually. */
1414 if (!verified_as_different
&& !parent_objfile
->crc32_p
)
1416 parent_objfile
->crc32_p
= get_file_crc (parent_objfile
->obfd
,
1417 &parent_objfile
->crc32
);
1418 if (!parent_objfile
->crc32_p
)
1422 if (verified_as_different
|| parent_objfile
->crc32
!= file_crc
)
1423 warning (_("the debug information found in \"%s\""
1424 " does not match \"%s\" (CRC mismatch).\n"),
1425 name
, parent_objfile
->name
);
1433 char *debug_file_directory
= NULL
;
1435 show_debug_file_directory (struct ui_file
*file
, int from_tty
,
1436 struct cmd_list_element
*c
, const char *value
)
1438 fprintf_filtered (file
,
1439 _("The directory where separate debug "
1440 "symbols are searched for is \"%s\".\n"),
1444 #if ! defined (DEBUG_SUBDIRECTORY)
1445 #define DEBUG_SUBDIRECTORY ".debug"
1449 find_separate_debug_file_by_debuglink (struct objfile
*objfile
)
1451 char *basename
, *debugdir
;
1453 char *debugfile
= NULL
;
1454 char *canon_name
= NULL
;
1455 unsigned long crc32
;
1458 basename
= get_debug_link_info (objfile
, &crc32
);
1460 if (basename
== NULL
)
1461 /* There's no separate debug info, hence there's no way we could
1462 load it => no warning. */
1463 goto cleanup_return_debugfile
;
1465 dir
= xstrdup (objfile
->name
);
1467 /* Strip off the final filename part, leaving the directory name,
1468 followed by a slash. The directory can be relative or absolute. */
1469 for (i
= strlen(dir
) - 1; i
>= 0; i
--)
1471 if (IS_DIR_SEPARATOR (dir
[i
]))
1474 /* If I is -1 then no directory is present there and DIR will be "". */
1477 /* Set I to max (strlen (canon_name), strlen (dir)). */
1478 canon_name
= lrealpath (dir
);
1480 if (canon_name
&& strlen (canon_name
) > i
)
1481 i
= strlen (canon_name
);
1483 debugfile
= xmalloc (strlen (debug_file_directory
) + 1
1485 + strlen (DEBUG_SUBDIRECTORY
)
1490 /* First try in the same directory as the original file. */
1491 strcpy (debugfile
, dir
);
1492 strcat (debugfile
, basename
);
1494 if (separate_debug_file_exists (debugfile
, crc32
, objfile
))
1495 goto cleanup_return_debugfile
;
1497 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */
1498 strcpy (debugfile
, dir
);
1499 strcat (debugfile
, DEBUG_SUBDIRECTORY
);
1500 strcat (debugfile
, "/");
1501 strcat (debugfile
, basename
);
1503 if (separate_debug_file_exists (debugfile
, crc32
, objfile
))
1504 goto cleanup_return_debugfile
;
1506 /* Then try in the global debugfile directories.
1508 Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
1509 cause "/..." lookups. */
1511 debugdir
= debug_file_directory
;
1516 while (*debugdir
== DIRNAME_SEPARATOR
)
1519 debugdir_end
= strchr (debugdir
, DIRNAME_SEPARATOR
);
1520 if (debugdir_end
== NULL
)
1521 debugdir_end
= &debugdir
[strlen (debugdir
)];
1523 memcpy (debugfile
, debugdir
, debugdir_end
- debugdir
);
1524 debugfile
[debugdir_end
- debugdir
] = 0;
1525 strcat (debugfile
, "/");
1526 strcat (debugfile
, dir
);
1527 strcat (debugfile
, basename
);
1529 if (separate_debug_file_exists (debugfile
, crc32
, objfile
))
1530 goto cleanup_return_debugfile
;
1532 /* If the file is in the sysroot, try using its base path in the
1533 global debugfile directory. */
1535 && filename_ncmp (canon_name
, gdb_sysroot
,
1536 strlen (gdb_sysroot
)) == 0
1537 && IS_DIR_SEPARATOR (canon_name
[strlen (gdb_sysroot
)]))
1539 memcpy (debugfile
, debugdir
, debugdir_end
- debugdir
);
1540 debugfile
[debugdir_end
- debugdir
] = 0;
1541 strcat (debugfile
, canon_name
+ strlen (gdb_sysroot
));
1542 strcat (debugfile
, "/");
1543 strcat (debugfile
, basename
);
1545 if (separate_debug_file_exists (debugfile
, crc32
, objfile
))
1546 goto cleanup_return_debugfile
;
1549 debugdir
= debugdir_end
;
1551 while (*debugdir
!= 0);
1556 cleanup_return_debugfile
:
1564 /* This is the symbol-file command. Read the file, analyze its
1565 symbols, and add a struct symtab to a symtab list. The syntax of
1566 the command is rather bizarre:
1568 1. The function buildargv implements various quoting conventions
1569 which are undocumented and have little or nothing in common with
1570 the way things are quoted (or not quoted) elsewhere in GDB.
1572 2. Options are used, which are not generally used in GDB (perhaps
1573 "set mapped on", "set readnow on" would be better)
1575 3. The order of options matters, which is contrary to GNU
1576 conventions (because it is confusing and inconvenient). */
1579 symbol_file_command (char *args
, int from_tty
)
1585 symbol_file_clear (from_tty
);
1589 char **argv
= gdb_buildargv (args
);
1590 int flags
= OBJF_USERLOADED
;
1591 struct cleanup
*cleanups
;
1594 cleanups
= make_cleanup_freeargv (argv
);
1595 while (*argv
!= NULL
)
1597 if (strcmp (*argv
, "-readnow") == 0)
1598 flags
|= OBJF_READNOW
;
1599 else if (**argv
== '-')
1600 error (_("unknown option `%s'"), *argv
);
1603 symbol_file_add_main_1 (*argv
, from_tty
, flags
);
1611 error (_("no symbol file name was specified"));
1613 do_cleanups (cleanups
);
1617 /* Set the initial language.
1619 FIXME: A better solution would be to record the language in the
1620 psymtab when reading partial symbols, and then use it (if known) to
1621 set the language. This would be a win for formats that encode the
1622 language in an easily discoverable place, such as DWARF. For
1623 stabs, we can jump through hoops looking for specially named
1624 symbols or try to intuit the language from the specific type of
1625 stabs we find, but we can't do that until later when we read in
1629 set_initial_language (void)
1631 enum language lang
= language_unknown
;
1633 if (language_of_main
!= language_unknown
)
1634 lang
= language_of_main
;
1637 const char *filename
;
1639 filename
= find_main_filename ();
1640 if (filename
!= NULL
)
1641 lang
= deduce_language_from_filename (filename
);
1644 if (lang
== language_unknown
)
1646 /* Make C the default language */
1650 set_language (lang
);
1651 expected_language
= current_language
; /* Don't warn the user. */
1654 /* If NAME is a remote name open the file using remote protocol, otherwise
1655 open it normally. */
1658 bfd_open_maybe_remote (const char *name
)
1660 if (remote_filename_p (name
))
1661 return remote_bfd_open (name
, gnutarget
);
1663 return bfd_openr (name
, gnutarget
);
1667 /* Open the file specified by NAME and hand it off to BFD for
1668 preliminary analysis. Return a newly initialized bfd *, which
1669 includes a newly malloc'd` copy of NAME (tilde-expanded and made
1670 absolute). In case of trouble, error() is called. */
1673 symfile_bfd_open (char *name
)
1677 char *absolute_name
;
1679 if (remote_filename_p (name
))
1681 name
= xstrdup (name
);
1682 sym_bfd
= remote_bfd_open (name
, gnutarget
);
1685 make_cleanup (xfree
, name
);
1686 error (_("`%s': can't open to read symbols: %s."), name
,
1687 bfd_errmsg (bfd_get_error ()));
1690 if (!bfd_check_format (sym_bfd
, bfd_object
))
1692 bfd_close (sym_bfd
);
1693 make_cleanup (xfree
, name
);
1694 error (_("`%s': can't read symbols: %s."), name
,
1695 bfd_errmsg (bfd_get_error ()));
1701 name
= tilde_expand (name
); /* Returns 1st new malloc'd copy. */
1703 /* Look down path for it, allocate 2nd new malloc'd copy. */
1704 desc
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
, name
,
1705 O_RDONLY
| O_BINARY
, &absolute_name
);
1706 #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__)
1709 char *exename
= alloca (strlen (name
) + 5);
1711 strcat (strcpy (exename
, name
), ".exe");
1712 desc
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
, exename
,
1713 O_RDONLY
| O_BINARY
, &absolute_name
);
1718 make_cleanup (xfree
, name
);
1719 perror_with_name (name
);
1722 /* Free 1st new malloc'd copy, but keep the 2nd malloc'd copy in
1723 bfd. It'll be freed in free_objfile(). */
1725 name
= absolute_name
;
1727 sym_bfd
= bfd_fopen (name
, gnutarget
, FOPEN_RB
, desc
);
1731 make_cleanup (xfree
, name
);
1732 error (_("`%s': can't open to read symbols: %s."), name
,
1733 bfd_errmsg (bfd_get_error ()));
1735 bfd_set_cacheable (sym_bfd
, 1);
1737 if (!bfd_check_format (sym_bfd
, bfd_object
))
1739 /* FIXME: should be checking for errors from bfd_close (for one
1740 thing, on error it does not free all the storage associated
1742 bfd_close (sym_bfd
); /* This also closes desc. */
1743 make_cleanup (xfree
, name
);
1744 error (_("`%s': can't read symbols: %s."), name
,
1745 bfd_errmsg (bfd_get_error ()));
1748 /* bfd_usrdata exists for applications and libbfd must not touch it. */
1749 gdb_assert (bfd_usrdata (sym_bfd
) == NULL
);
1754 /* Return the section index for SECTION_NAME on OBJFILE. Return -1 if
1755 the section was not found. */
1758 get_section_index (struct objfile
*objfile
, char *section_name
)
1760 asection
*sect
= bfd_get_section_by_name (objfile
->obfd
, section_name
);
1768 /* Link SF into the global symtab_fns list. Called on startup by the
1769 _initialize routine in each object file format reader, to register
1770 information about each format the reader is prepared to handle. */
1773 add_symtab_fns (const struct sym_fns
*sf
)
1775 VEC_safe_push (sym_fns_ptr
, symtab_fns
, sf
);
1778 /* Initialize OBJFILE to read symbols from its associated BFD. It
1779 either returns or calls error(). The result is an initialized
1780 struct sym_fns in the objfile structure, that contains cached
1781 information about the symbol file. */
1783 static const struct sym_fns
*
1784 find_sym_fns (bfd
*abfd
)
1786 const struct sym_fns
*sf
;
1787 enum bfd_flavour our_flavour
= bfd_get_flavour (abfd
);
1790 if (our_flavour
== bfd_target_srec_flavour
1791 || our_flavour
== bfd_target_ihex_flavour
1792 || our_flavour
== bfd_target_tekhex_flavour
)
1793 return NULL
; /* No symbols. */
1795 for (i
= 0; VEC_iterate (sym_fns_ptr
, symtab_fns
, i
, sf
); ++i
)
1796 if (our_flavour
== sf
->sym_flavour
)
1799 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."),
1800 bfd_get_target (abfd
));
1804 /* This function runs the load command of our current target. */
1807 load_command (char *arg
, int from_tty
)
1811 /* The user might be reloading because the binary has changed. Take
1812 this opportunity to check. */
1813 reopen_exec_file ();
1821 parg
= arg
= get_exec_file (1);
1823 /* Count how many \ " ' tab space there are in the name. */
1824 while ((parg
= strpbrk (parg
, "\\\"'\t ")))
1832 /* We need to quote this string so buildargv can pull it apart. */
1833 char *temp
= xmalloc (strlen (arg
) + count
+ 1 );
1837 make_cleanup (xfree
, temp
);
1840 while ((parg
= strpbrk (parg
, "\\\"'\t ")))
1842 strncpy (ptemp
, prev
, parg
- prev
);
1843 ptemp
+= parg
- prev
;
1847 strcpy (ptemp
, prev
);
1853 target_load (arg
, from_tty
);
1855 /* After re-loading the executable, we don't really know which
1856 overlays are mapped any more. */
1857 overlay_cache_invalid
= 1;
1860 /* This version of "load" should be usable for any target. Currently
1861 it is just used for remote targets, not inftarg.c or core files,
1862 on the theory that only in that case is it useful.
1864 Avoiding xmodem and the like seems like a win (a) because we don't have
1865 to worry about finding it, and (b) On VMS, fork() is very slow and so
1866 we don't want to run a subprocess. On the other hand, I'm not sure how
1867 performance compares. */
1869 static int validate_download
= 0;
1871 /* Callback service function for generic_load (bfd_map_over_sections). */
1874 add_section_size_callback (bfd
*abfd
, asection
*asec
, void *data
)
1876 bfd_size_type
*sum
= data
;
1878 *sum
+= bfd_get_section_size (asec
);
1881 /* Opaque data for load_section_callback. */
1882 struct load_section_data
{
1883 unsigned long load_offset
;
1884 struct load_progress_data
*progress_data
;
1885 VEC(memory_write_request_s
) *requests
;
1888 /* Opaque data for load_progress. */
1889 struct load_progress_data
{
1890 /* Cumulative data. */
1891 unsigned long write_count
;
1892 unsigned long data_count
;
1893 bfd_size_type total_size
;
1896 /* Opaque data for load_progress for a single section. */
1897 struct load_progress_section_data
{
1898 struct load_progress_data
*cumulative
;
1900 /* Per-section data. */
1901 const char *section_name
;
1902 ULONGEST section_sent
;
1903 ULONGEST section_size
;
1908 /* Target write callback routine for progress reporting. */
1911 load_progress (ULONGEST bytes
, void *untyped_arg
)
1913 struct load_progress_section_data
*args
= untyped_arg
;
1914 struct load_progress_data
*totals
;
1917 /* Writing padding data. No easy way to get at the cumulative
1918 stats, so just ignore this. */
1921 totals
= args
->cumulative
;
1923 if (bytes
== 0 && args
->section_sent
== 0)
1925 /* The write is just starting. Let the user know we've started
1927 ui_out_message (current_uiout
, 0, "Loading section %s, size %s lma %s\n",
1928 args
->section_name
, hex_string (args
->section_size
),
1929 paddress (target_gdbarch
, args
->lma
));
1933 if (validate_download
)
1935 /* Broken memories and broken monitors manifest themselves here
1936 when bring new computers to life. This doubles already slow
1938 /* NOTE: cagney/1999-10-18: A more efficient implementation
1939 might add a verify_memory() method to the target vector and
1940 then use that. remote.c could implement that method using
1941 the ``qCRC'' packet. */
1942 gdb_byte
*check
= xmalloc (bytes
);
1943 struct cleanup
*verify_cleanups
= make_cleanup (xfree
, check
);
1945 if (target_read_memory (args
->lma
, check
, bytes
) != 0)
1946 error (_("Download verify read failed at %s"),
1947 paddress (target_gdbarch
, args
->lma
));
1948 if (memcmp (args
->buffer
, check
, bytes
) != 0)
1949 error (_("Download verify compare failed at %s"),
1950 paddress (target_gdbarch
, args
->lma
));
1951 do_cleanups (verify_cleanups
);
1953 totals
->data_count
+= bytes
;
1955 args
->buffer
+= bytes
;
1956 totals
->write_count
+= 1;
1957 args
->section_sent
+= bytes
;
1959 || (deprecated_ui_load_progress_hook
!= NULL
1960 && deprecated_ui_load_progress_hook (args
->section_name
,
1961 args
->section_sent
)))
1962 error (_("Canceled the download"));
1964 if (deprecated_show_load_progress
!= NULL
)
1965 deprecated_show_load_progress (args
->section_name
,
1969 totals
->total_size
);
1972 /* Callback service function for generic_load (bfd_map_over_sections). */
1975 load_section_callback (bfd
*abfd
, asection
*asec
, void *data
)
1977 struct memory_write_request
*new_request
;
1978 struct load_section_data
*args
= data
;
1979 struct load_progress_section_data
*section_data
;
1980 bfd_size_type size
= bfd_get_section_size (asec
);
1982 const char *sect_name
= bfd_get_section_name (abfd
, asec
);
1984 if ((bfd_get_section_flags (abfd
, asec
) & SEC_LOAD
) == 0)
1990 new_request
= VEC_safe_push (memory_write_request_s
,
1991 args
->requests
, NULL
);
1992 memset (new_request
, 0, sizeof (struct memory_write_request
));
1993 section_data
= xcalloc (1, sizeof (struct load_progress_section_data
));
1994 new_request
->begin
= bfd_section_lma (abfd
, asec
) + args
->load_offset
;
1995 new_request
->end
= new_request
->begin
+ size
; /* FIXME Should size
1997 new_request
->data
= xmalloc (size
);
1998 new_request
->baton
= section_data
;
2000 buffer
= new_request
->data
;
2002 section_data
->cumulative
= args
->progress_data
;
2003 section_data
->section_name
= sect_name
;
2004 section_data
->section_size
= size
;
2005 section_data
->lma
= new_request
->begin
;
2006 section_data
->buffer
= buffer
;
2008 bfd_get_section_contents (abfd
, asec
, buffer
, 0, size
);
2011 /* Clean up an entire memory request vector, including load
2012 data and progress records. */
2015 clear_memory_write_data (void *arg
)
2017 VEC(memory_write_request_s
) **vec_p
= arg
;
2018 VEC(memory_write_request_s
) *vec
= *vec_p
;
2020 struct memory_write_request
*mr
;
2022 for (i
= 0; VEC_iterate (memory_write_request_s
, vec
, i
, mr
); ++i
)
2027 VEC_free (memory_write_request_s
, vec
);
2031 generic_load (char *args
, int from_tty
)
2034 struct timeval start_time
, end_time
;
2036 struct cleanup
*old_cleanups
= make_cleanup (null_cleanup
, 0);
2037 struct load_section_data cbdata
;
2038 struct load_progress_data total_progress
;
2039 struct ui_out
*uiout
= current_uiout
;
2044 memset (&cbdata
, 0, sizeof (cbdata
));
2045 memset (&total_progress
, 0, sizeof (total_progress
));
2046 cbdata
.progress_data
= &total_progress
;
2048 make_cleanup (clear_memory_write_data
, &cbdata
.requests
);
2051 error_no_arg (_("file to load"));
2053 argv
= gdb_buildargv (args
);
2054 make_cleanup_freeargv (argv
);
2056 filename
= tilde_expand (argv
[0]);
2057 make_cleanup (xfree
, filename
);
2059 if (argv
[1] != NULL
)
2063 cbdata
.load_offset
= strtoul (argv
[1], &endptr
, 0);
2065 /* If the last word was not a valid number then
2066 treat it as a file name with spaces in. */
2067 if (argv
[1] == endptr
)
2068 error (_("Invalid download offset:%s."), argv
[1]);
2070 if (argv
[2] != NULL
)
2071 error (_("Too many parameters."));
2074 /* Open the file for loading. */
2075 loadfile_bfd
= bfd_openr (filename
, gnutarget
);
2076 if (loadfile_bfd
== NULL
)
2078 perror_with_name (filename
);
2082 /* FIXME: should be checking for errors from bfd_close (for one thing,
2083 on error it does not free all the storage associated with the
2085 make_cleanup_bfd_close (loadfile_bfd
);
2087 if (!bfd_check_format (loadfile_bfd
, bfd_object
))
2089 error (_("\"%s\" is not an object file: %s"), filename
,
2090 bfd_errmsg (bfd_get_error ()));
2093 bfd_map_over_sections (loadfile_bfd
, add_section_size_callback
,
2094 (void *) &total_progress
.total_size
);
2096 bfd_map_over_sections (loadfile_bfd
, load_section_callback
, &cbdata
);
2098 gettimeofday (&start_time
, NULL
);
2100 if (target_write_memory_blocks (cbdata
.requests
, flash_discard
,
2101 load_progress
) != 0)
2102 error (_("Load failed"));
2104 gettimeofday (&end_time
, NULL
);
2106 entry
= bfd_get_start_address (loadfile_bfd
);
2107 ui_out_text (uiout
, "Start address ");
2108 ui_out_field_fmt (uiout
, "address", "%s", paddress (target_gdbarch
, entry
));
2109 ui_out_text (uiout
, ", load size ");
2110 ui_out_field_fmt (uiout
, "load-size", "%lu", total_progress
.data_count
);
2111 ui_out_text (uiout
, "\n");
2112 /* We were doing this in remote-mips.c, I suspect it is right
2113 for other targets too. */
2114 regcache_write_pc (get_current_regcache (), entry
);
2116 /* Reset breakpoints, now that we have changed the load image. For
2117 instance, breakpoints may have been set (or reset, by
2118 post_create_inferior) while connected to the target but before we
2119 loaded the program. In that case, the prologue analyzer could
2120 have read instructions from the target to find the right
2121 breakpoint locations. Loading has changed the contents of that
2124 breakpoint_re_set ();
2126 /* FIXME: are we supposed to call symbol_file_add or not? According
2127 to a comment from remote-mips.c (where a call to symbol_file_add
2128 was commented out), making the call confuses GDB if more than one
2129 file is loaded in. Some targets do (e.g., remote-vx.c) but
2130 others don't (or didn't - perhaps they have all been deleted). */
2132 print_transfer_performance (gdb_stdout
, total_progress
.data_count
,
2133 total_progress
.write_count
,
2134 &start_time
, &end_time
);
2136 do_cleanups (old_cleanups
);
2139 /* Report how fast the transfer went. */
2141 /* DEPRECATED: cagney/1999-10-18: report_transfer_performance is being
2142 replaced by print_transfer_performance (with a very different
2143 function signature). */
2146 report_transfer_performance (unsigned long data_count
, time_t start_time
,
2149 struct timeval start
, end
;
2151 start
.tv_sec
= start_time
;
2153 end
.tv_sec
= end_time
;
2156 print_transfer_performance (gdb_stdout
, data_count
, 0, &start
, &end
);
2160 print_transfer_performance (struct ui_file
*stream
,
2161 unsigned long data_count
,
2162 unsigned long write_count
,
2163 const struct timeval
*start_time
,
2164 const struct timeval
*end_time
)
2166 ULONGEST time_count
;
2167 struct ui_out
*uiout
= current_uiout
;
2169 /* Compute the elapsed time in milliseconds, as a tradeoff between
2170 accuracy and overflow. */
2171 time_count
= (end_time
->tv_sec
- start_time
->tv_sec
) * 1000;
2172 time_count
+= (end_time
->tv_usec
- start_time
->tv_usec
) / 1000;
2174 ui_out_text (uiout
, "Transfer rate: ");
2177 unsigned long rate
= ((ULONGEST
) data_count
* 1000) / time_count
;
2179 if (ui_out_is_mi_like_p (uiout
))
2181 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
* 8);
2182 ui_out_text (uiout
, " bits/sec");
2184 else if (rate
< 1024)
2186 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
);
2187 ui_out_text (uiout
, " bytes/sec");
2191 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
/ 1024);
2192 ui_out_text (uiout
, " KB/sec");
2197 ui_out_field_fmt (uiout
, "transferred-bits", "%lu", (data_count
* 8));
2198 ui_out_text (uiout
, " bits in <1 sec");
2200 if (write_count
> 0)
2202 ui_out_text (uiout
, ", ");
2203 ui_out_field_fmt (uiout
, "write-rate", "%lu", data_count
/ write_count
);
2204 ui_out_text (uiout
, " bytes/write");
2206 ui_out_text (uiout
, ".\n");
2209 /* This function allows the addition of incrementally linked object files.
2210 It does not modify any state in the target, only in the debugger. */
2211 /* Note: ezannoni 2000-04-13 This function/command used to have a
2212 special case syntax for the rombug target (Rombug is the boot
2213 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the
2214 rombug case, the user doesn't need to supply a text address,
2215 instead a call to target_link() (in target.c) would supply the
2216 value to use. We are now discontinuing this type of ad hoc syntax. */
2219 add_symbol_file_command (char *args
, int from_tty
)
2221 struct gdbarch
*gdbarch
= get_current_arch ();
2222 char *filename
= NULL
;
2223 int flags
= OBJF_USERLOADED
;
2225 int section_index
= 0;
2229 int expecting_sec_name
= 0;
2230 int expecting_sec_addr
= 0;
2239 struct section_addr_info
*section_addrs
;
2240 struct sect_opt
*sect_opts
= NULL
;
2241 size_t num_sect_opts
= 0;
2242 struct cleanup
*my_cleanups
= make_cleanup (null_cleanup
, NULL
);
2245 sect_opts
= (struct sect_opt
*) xmalloc (num_sect_opts
2246 * sizeof (struct sect_opt
));
2251 error (_("add-symbol-file takes a file name and an address"));
2253 argv
= gdb_buildargv (args
);
2254 make_cleanup_freeargv (argv
);
2256 for (arg
= argv
[0], argcnt
= 0; arg
!= NULL
; arg
= argv
[++argcnt
])
2258 /* Process the argument. */
2261 /* The first argument is the file name. */
2262 filename
= tilde_expand (arg
);
2263 make_cleanup (xfree
, filename
);
2268 /* The second argument is always the text address at which
2269 to load the program. */
2270 sect_opts
[section_index
].name
= ".text";
2271 sect_opts
[section_index
].value
= arg
;
2272 if (++section_index
>= num_sect_opts
)
2275 sect_opts
= ((struct sect_opt
*)
2276 xrealloc (sect_opts
,
2278 * sizeof (struct sect_opt
)));
2283 /* It's an option (starting with '-') or it's an argument
2288 if (strcmp (arg
, "-readnow") == 0)
2289 flags
|= OBJF_READNOW
;
2290 else if (strcmp (arg
, "-s") == 0)
2292 expecting_sec_name
= 1;
2293 expecting_sec_addr
= 1;
2298 if (expecting_sec_name
)
2300 sect_opts
[section_index
].name
= arg
;
2301 expecting_sec_name
= 0;
2304 if (expecting_sec_addr
)
2306 sect_opts
[section_index
].value
= arg
;
2307 expecting_sec_addr
= 0;
2308 if (++section_index
>= num_sect_opts
)
2311 sect_opts
= ((struct sect_opt
*)
2312 xrealloc (sect_opts
,
2314 * sizeof (struct sect_opt
)));
2318 error (_("USAGE: add-symbol-file <filename> <textaddress>"
2319 " [-readnow] [-s <secname> <addr>]*"));
2324 /* This command takes at least two arguments. The first one is a
2325 filename, and the second is the address where this file has been
2326 loaded. Abort now if this address hasn't been provided by the
2328 if (section_index
< 1)
2329 error (_("The address where %s has been loaded is missing"), filename
);
2331 /* Print the prompt for the query below. And save the arguments into
2332 a sect_addr_info structure to be passed around to other
2333 functions. We have to split this up into separate print
2334 statements because hex_string returns a local static
2337 printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename
);
2338 section_addrs
= alloc_section_addr_info (section_index
);
2339 make_cleanup (xfree
, section_addrs
);
2340 for (i
= 0; i
< section_index
; i
++)
2343 char *val
= sect_opts
[i
].value
;
2344 char *sec
= sect_opts
[i
].name
;
2346 addr
= parse_and_eval_address (val
);
2348 /* Here we store the section offsets in the order they were
2349 entered on the command line. */
2350 section_addrs
->other
[sec_num
].name
= sec
;
2351 section_addrs
->other
[sec_num
].addr
= addr
;
2352 printf_unfiltered ("\t%s_addr = %s\n", sec
,
2353 paddress (gdbarch
, addr
));
2356 /* The object's sections are initialized when a
2357 call is made to build_objfile_section_table (objfile).
2358 This happens in reread_symbols.
2359 At this point, we don't know what file type this is,
2360 so we can't determine what section names are valid. */
2363 if (from_tty
&& (!query ("%s", "")))
2364 error (_("Not confirmed."));
2366 symbol_file_add (filename
, from_tty
? SYMFILE_VERBOSE
: 0,
2367 section_addrs
, flags
);
2369 /* Getting new symbols may change our opinion about what is
2371 reinit_frame_cache ();
2372 do_cleanups (my_cleanups
);
2376 /* Re-read symbols if a symbol-file has changed. */
2378 reread_symbols (void)
2380 struct objfile
*objfile
;
2383 struct stat new_statbuf
;
2386 /* With the addition of shared libraries, this should be modified,
2387 the load time should be saved in the partial symbol tables, since
2388 different tables may come from different source files. FIXME.
2389 This routine should then walk down each partial symbol table
2390 and see if the symbol table that it originates from has been changed. */
2392 for (objfile
= object_files
; objfile
; objfile
= objfile
->next
)
2394 /* solib-sunos.c creates one objfile with obfd. */
2395 if (objfile
->obfd
== NULL
)
2398 /* Separate debug objfiles are handled in the main objfile. */
2399 if (objfile
->separate_debug_objfile_backlink
)
2402 /* If this object is from an archive (what you usually create with
2403 `ar', often called a `static library' on most systems, though
2404 a `shared library' on AIX is also an archive), then you should
2405 stat on the archive name, not member name. */
2406 if (objfile
->obfd
->my_archive
)
2407 res
= stat (objfile
->obfd
->my_archive
->filename
, &new_statbuf
);
2409 res
= stat (objfile
->name
, &new_statbuf
);
2412 /* FIXME, should use print_sys_errmsg but it's not filtered. */
2413 printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"),
2417 new_modtime
= new_statbuf
.st_mtime
;
2418 if (new_modtime
!= objfile
->mtime
)
2420 struct cleanup
*old_cleanups
;
2421 struct section_offsets
*offsets
;
2423 char *obfd_filename
;
2425 printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"),
2428 /* There are various functions like symbol_file_add,
2429 symfile_bfd_open, syms_from_objfile, etc., which might
2430 appear to do what we want. But they have various other
2431 effects which we *don't* want. So we just do stuff
2432 ourselves. We don't worry about mapped files (for one thing,
2433 any mapped file will be out of date). */
2435 /* If we get an error, blow away this objfile (not sure if
2436 that is the correct response for things like shared
2438 old_cleanups
= make_cleanup_free_objfile (objfile
);
2439 /* We need to do this whenever any symbols go away. */
2440 make_cleanup (clear_symtab_users_cleanup
, 0 /*ignore*/);
2442 if (exec_bfd
!= NULL
2443 && filename_cmp (bfd_get_filename (objfile
->obfd
),
2444 bfd_get_filename (exec_bfd
)) == 0)
2446 /* Reload EXEC_BFD without asking anything. */
2448 exec_file_attach (bfd_get_filename (objfile
->obfd
), 0);
2451 /* Clean up any state BFD has sitting around. We don't need
2452 to close the descriptor but BFD lacks a way of closing the
2453 BFD without closing the descriptor. */
2454 obfd_filename
= bfd_get_filename (objfile
->obfd
);
2455 if (!bfd_close (objfile
->obfd
))
2456 error (_("Can't close BFD for %s: %s"), objfile
->name
,
2457 bfd_errmsg (bfd_get_error ()));
2458 objfile
->obfd
= bfd_open_maybe_remote (obfd_filename
);
2459 if (objfile
->obfd
== NULL
)
2460 error (_("Can't open %s to read symbols."), objfile
->name
);
2462 objfile
->obfd
= gdb_bfd_ref (objfile
->obfd
);
2463 /* bfd_openr sets cacheable to true, which is what we want. */
2464 if (!bfd_check_format (objfile
->obfd
, bfd_object
))
2465 error (_("Can't read symbols from %s: %s."), objfile
->name
,
2466 bfd_errmsg (bfd_get_error ()));
2468 /* Save the offsets, we will nuke them with the rest of the
2470 num_offsets
= objfile
->num_sections
;
2471 offsets
= ((struct section_offsets
*)
2472 alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets
)));
2473 memcpy (offsets
, objfile
->section_offsets
,
2474 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2476 /* Remove any references to this objfile in the global
2478 preserve_values (objfile
);
2480 /* Nuke all the state that we will re-read. Much of the following
2481 code which sets things to NULL really is necessary to tell
2482 other parts of GDB that there is nothing currently there.
2484 Try to keep the freeing order compatible with free_objfile. */
2486 if (objfile
->sf
!= NULL
)
2488 (*objfile
->sf
->sym_finish
) (objfile
);
2491 clear_objfile_data (objfile
);
2493 /* Free the separate debug objfiles. It will be
2494 automatically recreated by sym_read. */
2495 free_objfile_separate_debug (objfile
);
2497 /* FIXME: Do we have to free a whole linked list, or is this
2499 if (objfile
->global_psymbols
.list
)
2500 xfree (objfile
->global_psymbols
.list
);
2501 memset (&objfile
->global_psymbols
, 0,
2502 sizeof (objfile
->global_psymbols
));
2503 if (objfile
->static_psymbols
.list
)
2504 xfree (objfile
->static_psymbols
.list
);
2505 memset (&objfile
->static_psymbols
, 0,
2506 sizeof (objfile
->static_psymbols
));
2508 /* Free the obstacks for non-reusable objfiles. */
2509 psymbol_bcache_free (objfile
->psymbol_cache
);
2510 objfile
->psymbol_cache
= psymbol_bcache_init ();
2511 bcache_xfree (objfile
->macro_cache
);
2512 objfile
->macro_cache
= bcache_xmalloc (NULL
, NULL
);
2513 bcache_xfree (objfile
->filename_cache
);
2514 objfile
->filename_cache
= bcache_xmalloc (NULL
,NULL
);
2515 if (objfile
->demangled_names_hash
!= NULL
)
2517 htab_delete (objfile
->demangled_names_hash
);
2518 objfile
->demangled_names_hash
= NULL
;
2520 obstack_free (&objfile
->objfile_obstack
, 0);
2521 objfile
->sections
= NULL
;
2522 objfile
->symtabs
= NULL
;
2523 objfile
->psymtabs
= NULL
;
2524 objfile
->psymtabs_addrmap
= NULL
;
2525 objfile
->free_psymtabs
= NULL
;
2526 objfile
->template_symbols
= NULL
;
2527 objfile
->msymbols
= NULL
;
2528 objfile
->deprecated_sym_private
= NULL
;
2529 objfile
->minimal_symbol_count
= 0;
2530 memset (&objfile
->msymbol_hash
, 0,
2531 sizeof (objfile
->msymbol_hash
));
2532 memset (&objfile
->msymbol_demangled_hash
, 0,
2533 sizeof (objfile
->msymbol_demangled_hash
));
2535 /* obstack_init also initializes the obstack so it is
2536 empty. We could use obstack_specify_allocation but
2537 gdb_obstack.h specifies the alloc/dealloc
2539 obstack_init (&objfile
->objfile_obstack
);
2540 if (build_objfile_section_table (objfile
))
2542 error (_("Can't find the file sections in `%s': %s"),
2543 objfile
->name
, bfd_errmsg (bfd_get_error ()));
2545 terminate_minimal_symbol_table (objfile
);
2547 /* We use the same section offsets as from last time. I'm not
2548 sure whether that is always correct for shared libraries. */
2549 objfile
->section_offsets
= (struct section_offsets
*)
2550 obstack_alloc (&objfile
->objfile_obstack
,
2551 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2552 memcpy (objfile
->section_offsets
, offsets
,
2553 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2554 objfile
->num_sections
= num_offsets
;
2556 /* What the hell is sym_new_init for, anyway? The concept of
2557 distinguishing between the main file and additional files
2558 in this way seems rather dubious. */
2559 if (objfile
== symfile_objfile
)
2561 (*objfile
->sf
->sym_new_init
) (objfile
);
2564 (*objfile
->sf
->sym_init
) (objfile
);
2565 clear_complaints (&symfile_complaints
, 1, 1);
2566 /* Do not set flags as this is safe and we don't want to be
2568 (*objfile
->sf
->sym_read
) (objfile
, 0);
2569 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) != 0)
2571 objfile
->flags
&= ~OBJF_PSYMTABS_READ
;
2572 require_partial_symbols (objfile
, 0);
2575 if (!objfile_has_symbols (objfile
))
2578 printf_unfiltered (_("(no debugging symbols found)\n"));
2582 /* We're done reading the symbol file; finish off complaints. */
2583 clear_complaints (&symfile_complaints
, 0, 1);
2585 /* Getting new symbols may change our opinion about what is
2588 reinit_frame_cache ();
2590 /* Discard cleanups as symbol reading was successful. */
2591 discard_cleanups (old_cleanups
);
2593 /* If the mtime has changed between the time we set new_modtime
2594 and now, we *want* this to be out of date, so don't call stat
2596 objfile
->mtime
= new_modtime
;
2598 init_entry_point_info (objfile
);
2604 /* Notify objfiles that we've modified objfile sections. */
2605 objfiles_changed ();
2607 clear_symtab_users (0);
2608 /* At least one objfile has changed, so we can consider that
2609 the executable we're debugging has changed too. */
2610 observer_notify_executable_changed ();
2623 static filename_language
*filename_language_table
;
2624 static int fl_table_size
, fl_table_next
;
2627 add_filename_language (char *ext
, enum language lang
)
2629 if (fl_table_next
>= fl_table_size
)
2631 fl_table_size
+= 10;
2632 filename_language_table
=
2633 xrealloc (filename_language_table
,
2634 fl_table_size
* sizeof (*filename_language_table
));
2637 filename_language_table
[fl_table_next
].ext
= xstrdup (ext
);
2638 filename_language_table
[fl_table_next
].lang
= lang
;
2642 static char *ext_args
;
2644 show_ext_args (struct ui_file
*file
, int from_tty
,
2645 struct cmd_list_element
*c
, const char *value
)
2647 fprintf_filtered (file
,
2648 _("Mapping between filename extension "
2649 "and source language is \"%s\".\n"),
2654 set_ext_lang_command (char *args
, int from_tty
, struct cmd_list_element
*e
)
2657 char *cp
= ext_args
;
2660 /* First arg is filename extension, starting with '.' */
2662 error (_("'%s': Filename extension must begin with '.'"), ext_args
);
2664 /* Find end of first arg. */
2665 while (*cp
&& !isspace (*cp
))
2669 error (_("'%s': two arguments required -- "
2670 "filename extension and language"),
2673 /* Null-terminate first arg. */
2676 /* Find beginning of second arg, which should be a source language. */
2677 while (*cp
&& isspace (*cp
))
2681 error (_("'%s': two arguments required -- "
2682 "filename extension and language"),
2685 /* Lookup the language from among those we know. */
2686 lang
= language_enum (cp
);
2688 /* Now lookup the filename extension: do we already know it? */
2689 for (i
= 0; i
< fl_table_next
; i
++)
2690 if (0 == strcmp (ext_args
, filename_language_table
[i
].ext
))
2693 if (i
>= fl_table_next
)
2695 /* New file extension. */
2696 add_filename_language (ext_args
, lang
);
2700 /* Redefining a previously known filename extension. */
2703 /* query ("Really make files of type %s '%s'?", */
2704 /* ext_args, language_str (lang)); */
2706 xfree (filename_language_table
[i
].ext
);
2707 filename_language_table
[i
].ext
= xstrdup (ext_args
);
2708 filename_language_table
[i
].lang
= lang
;
2713 info_ext_lang_command (char *args
, int from_tty
)
2717 printf_filtered (_("Filename extensions and the languages they represent:"));
2718 printf_filtered ("\n\n");
2719 for (i
= 0; i
< fl_table_next
; i
++)
2720 printf_filtered ("\t%s\t- %s\n",
2721 filename_language_table
[i
].ext
,
2722 language_str (filename_language_table
[i
].lang
));
2726 init_filename_language_table (void)
2728 if (fl_table_size
== 0) /* Protect against repetition. */
2732 filename_language_table
=
2733 xmalloc (fl_table_size
* sizeof (*filename_language_table
));
2734 add_filename_language (".c", language_c
);
2735 add_filename_language (".d", language_d
);
2736 add_filename_language (".C", language_cplus
);
2737 add_filename_language (".cc", language_cplus
);
2738 add_filename_language (".cp", language_cplus
);
2739 add_filename_language (".cpp", language_cplus
);
2740 add_filename_language (".cxx", language_cplus
);
2741 add_filename_language (".c++", language_cplus
);
2742 add_filename_language (".java", language_java
);
2743 add_filename_language (".class", language_java
);
2744 add_filename_language (".m", language_objc
);
2745 add_filename_language (".f", language_fortran
);
2746 add_filename_language (".F", language_fortran
);
2747 add_filename_language (".for", language_fortran
);
2748 add_filename_language (".FOR", language_fortran
);
2749 add_filename_language (".ftn", language_fortran
);
2750 add_filename_language (".FTN", language_fortran
);
2751 add_filename_language (".fpp", language_fortran
);
2752 add_filename_language (".FPP", language_fortran
);
2753 add_filename_language (".f90", language_fortran
);
2754 add_filename_language (".F90", language_fortran
);
2755 add_filename_language (".f95", language_fortran
);
2756 add_filename_language (".F95", language_fortran
);
2757 add_filename_language (".f03", language_fortran
);
2758 add_filename_language (".F03", language_fortran
);
2759 add_filename_language (".f08", language_fortran
);
2760 add_filename_language (".F08", language_fortran
);
2761 add_filename_language (".s", language_asm
);
2762 add_filename_language (".sx", language_asm
);
2763 add_filename_language (".S", language_asm
);
2764 add_filename_language (".pas", language_pascal
);
2765 add_filename_language (".p", language_pascal
);
2766 add_filename_language (".pp", language_pascal
);
2767 add_filename_language (".adb", language_ada
);
2768 add_filename_language (".ads", language_ada
);
2769 add_filename_language (".a", language_ada
);
2770 add_filename_language (".ada", language_ada
);
2771 add_filename_language (".dg", language_ada
);
2776 deduce_language_from_filename (const char *filename
)
2781 if (filename
!= NULL
)
2782 if ((cp
= strrchr (filename
, '.')) != NULL
)
2783 for (i
= 0; i
< fl_table_next
; i
++)
2784 if (strcmp (cp
, filename_language_table
[i
].ext
) == 0)
2785 return filename_language_table
[i
].lang
;
2787 return language_unknown
;
2792 Allocate and partly initialize a new symbol table. Return a pointer
2793 to it. error() if no space.
2795 Caller must set these fields:
2804 allocate_symtab (const char *filename
, struct objfile
*objfile
)
2806 struct symtab
*symtab
;
2808 symtab
= (struct symtab
*)
2809 obstack_alloc (&objfile
->objfile_obstack
, sizeof (struct symtab
));
2810 memset (symtab
, 0, sizeof (*symtab
));
2811 symtab
->filename
= (char *) bcache (filename
, strlen (filename
) + 1,
2812 objfile
->filename_cache
);
2813 symtab
->fullname
= NULL
;
2814 symtab
->language
= deduce_language_from_filename (filename
);
2815 symtab
->debugformat
= "unknown";
2817 /* Hook it to the objfile it comes from. */
2819 symtab
->objfile
= objfile
;
2820 symtab
->next
= objfile
->symtabs
;
2821 objfile
->symtabs
= symtab
;
2827 /* Reset all data structures in gdb which may contain references to symbol
2828 table data. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
2831 clear_symtab_users (int add_flags
)
2833 /* Someday, we should do better than this, by only blowing away
2834 the things that really need to be blown. */
2836 /* Clear the "current" symtab first, because it is no longer valid.
2837 breakpoint_re_set may try to access the current symtab. */
2838 clear_current_source_symtab_and_line ();
2841 if ((add_flags
& SYMFILE_DEFER_BP_RESET
) == 0)
2842 breakpoint_re_set ();
2843 clear_last_displayed_sal ();
2844 clear_pc_function_cache ();
2845 observer_notify_new_objfile (NULL
);
2847 /* Clear globals which might have pointed into a removed objfile.
2848 FIXME: It's not clear which of these are supposed to persist
2849 between expressions and which ought to be reset each time. */
2850 expression_context_block
= NULL
;
2851 innermost_block
= NULL
;
2853 /* Varobj may refer to old symbols, perform a cleanup. */
2854 varobj_invalidate ();
2859 clear_symtab_users_cleanup (void *ignore
)
2861 clear_symtab_users (0);
2865 The following code implements an abstraction for debugging overlay sections.
2867 The target model is as follows:
2868 1) The gnu linker will permit multiple sections to be mapped into the
2869 same VMA, each with its own unique LMA (or load address).
2870 2) It is assumed that some runtime mechanism exists for mapping the
2871 sections, one by one, from the load address into the VMA address.
2872 3) This code provides a mechanism for gdb to keep track of which
2873 sections should be considered to be mapped from the VMA to the LMA.
2874 This information is used for symbol lookup, and memory read/write.
2875 For instance, if a section has been mapped then its contents
2876 should be read from the VMA, otherwise from the LMA.
2878 Two levels of debugger support for overlays are available. One is
2879 "manual", in which the debugger relies on the user to tell it which
2880 overlays are currently mapped. This level of support is
2881 implemented entirely in the core debugger, and the information about
2882 whether a section is mapped is kept in the objfile->obj_section table.
2884 The second level of support is "automatic", and is only available if
2885 the target-specific code provides functionality to read the target's
2886 overlay mapping table, and translate its contents for the debugger
2887 (by updating the mapped state information in the obj_section tables).
2889 The interface is as follows:
2891 overlay map <name> -- tell gdb to consider this section mapped
2892 overlay unmap <name> -- tell gdb to consider this section unmapped
2893 overlay list -- list the sections that GDB thinks are mapped
2894 overlay read-target -- get the target's state of what's mapped
2895 overlay off/manual/auto -- set overlay debugging state
2896 Functional interface:
2897 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2898 section, return that section.
2899 find_pc_overlay(pc): find any overlay section that contains
2900 the pc, either in its VMA or its LMA
2901 section_is_mapped(sect): true if overlay is marked as mapped
2902 section_is_overlay(sect): true if section's VMA != LMA
2903 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2904 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2905 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap
2906 overlay_mapped_address(...): map an address from section's LMA to VMA
2907 overlay_unmapped_address(...): map an address from section's VMA to LMA
2908 symbol_overlayed_address(...): Return a "current" address for symbol:
2909 either in VMA or LMA depending on whether
2910 the symbol's section is currently mapped. */
2912 /* Overlay debugging state: */
2914 enum overlay_debugging_state overlay_debugging
= ovly_off
;
2915 int overlay_cache_invalid
= 0; /* True if need to refresh mapped state. */
2917 /* Function: section_is_overlay (SECTION)
2918 Returns true if SECTION has VMA not equal to LMA, ie.
2919 SECTION is loaded at an address different from where it will "run". */
2922 section_is_overlay (struct obj_section
*section
)
2924 if (overlay_debugging
&& section
)
2926 bfd
*abfd
= section
->objfile
->obfd
;
2927 asection
*bfd_section
= section
->the_bfd_section
;
2929 if (bfd_section_lma (abfd
, bfd_section
) != 0
2930 && bfd_section_lma (abfd
, bfd_section
)
2931 != bfd_section_vma (abfd
, bfd_section
))
2938 /* Function: overlay_invalidate_all (void)
2939 Invalidate the mapped state of all overlay sections (mark it as stale). */
2942 overlay_invalidate_all (void)
2944 struct objfile
*objfile
;
2945 struct obj_section
*sect
;
2947 ALL_OBJSECTIONS (objfile
, sect
)
2948 if (section_is_overlay (sect
))
2949 sect
->ovly_mapped
= -1;
2952 /* Function: section_is_mapped (SECTION)
2953 Returns true if section is an overlay, and is currently mapped.
2955 Access to the ovly_mapped flag is restricted to this function, so
2956 that we can do automatic update. If the global flag
2957 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
2958 overlay_invalidate_all. If the mapped state of the particular
2959 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
2962 section_is_mapped (struct obj_section
*osect
)
2964 struct gdbarch
*gdbarch
;
2966 if (osect
== 0 || !section_is_overlay (osect
))
2969 switch (overlay_debugging
)
2973 return 0; /* overlay debugging off */
2974 case ovly_auto
: /* overlay debugging automatic */
2975 /* Unles there is a gdbarch_overlay_update function,
2976 there's really nothing useful to do here (can't really go auto). */
2977 gdbarch
= get_objfile_arch (osect
->objfile
);
2978 if (gdbarch_overlay_update_p (gdbarch
))
2980 if (overlay_cache_invalid
)
2982 overlay_invalidate_all ();
2983 overlay_cache_invalid
= 0;
2985 if (osect
->ovly_mapped
== -1)
2986 gdbarch_overlay_update (gdbarch
, osect
);
2988 /* fall thru to manual case */
2989 case ovly_on
: /* overlay debugging manual */
2990 return osect
->ovly_mapped
== 1;
2994 /* Function: pc_in_unmapped_range
2995 If PC falls into the lma range of SECTION, return true, else false. */
2998 pc_in_unmapped_range (CORE_ADDR pc
, struct obj_section
*section
)
3000 if (section_is_overlay (section
))
3002 bfd
*abfd
= section
->objfile
->obfd
;
3003 asection
*bfd_section
= section
->the_bfd_section
;
3005 /* We assume the LMA is relocated by the same offset as the VMA. */
3006 bfd_vma size
= bfd_get_section_size (bfd_section
);
3007 CORE_ADDR offset
= obj_section_offset (section
);
3009 if (bfd_get_section_lma (abfd
, bfd_section
) + offset
<= pc
3010 && pc
< bfd_get_section_lma (abfd
, bfd_section
) + offset
+ size
)
3017 /* Function: pc_in_mapped_range
3018 If PC falls into the vma range of SECTION, return true, else false. */
3021 pc_in_mapped_range (CORE_ADDR pc
, struct obj_section
*section
)
3023 if (section_is_overlay (section
))
3025 if (obj_section_addr (section
) <= pc
3026 && pc
< obj_section_endaddr (section
))
3034 /* Return true if the mapped ranges of sections A and B overlap, false
3037 sections_overlap (struct obj_section
*a
, struct obj_section
*b
)
3039 CORE_ADDR a_start
= obj_section_addr (a
);
3040 CORE_ADDR a_end
= obj_section_endaddr (a
);
3041 CORE_ADDR b_start
= obj_section_addr (b
);
3042 CORE_ADDR b_end
= obj_section_endaddr (b
);
3044 return (a_start
< b_end
&& b_start
< a_end
);
3047 /* Function: overlay_unmapped_address (PC, SECTION)
3048 Returns the address corresponding to PC in the unmapped (load) range.
3049 May be the same as PC. */
3052 overlay_unmapped_address (CORE_ADDR pc
, struct obj_section
*section
)
3054 if (section_is_overlay (section
) && pc_in_mapped_range (pc
, section
))
3056 bfd
*abfd
= section
->objfile
->obfd
;
3057 asection
*bfd_section
= section
->the_bfd_section
;
3059 return pc
+ bfd_section_lma (abfd
, bfd_section
)
3060 - bfd_section_vma (abfd
, bfd_section
);
3066 /* Function: overlay_mapped_address (PC, SECTION)
3067 Returns the address corresponding to PC in the mapped (runtime) range.
3068 May be the same as PC. */
3071 overlay_mapped_address (CORE_ADDR pc
, struct obj_section
*section
)
3073 if (section_is_overlay (section
) && pc_in_unmapped_range (pc
, section
))
3075 bfd
*abfd
= section
->objfile
->obfd
;
3076 asection
*bfd_section
= section
->the_bfd_section
;
3078 return pc
+ bfd_section_vma (abfd
, bfd_section
)
3079 - bfd_section_lma (abfd
, bfd_section
);
3086 /* Function: symbol_overlayed_address
3087 Return one of two addresses (relative to the VMA or to the LMA),
3088 depending on whether the section is mapped or not. */
3091 symbol_overlayed_address (CORE_ADDR address
, struct obj_section
*section
)
3093 if (overlay_debugging
)
3095 /* If the symbol has no section, just return its regular address. */
3098 /* If the symbol's section is not an overlay, just return its
3100 if (!section_is_overlay (section
))
3102 /* If the symbol's section is mapped, just return its address. */
3103 if (section_is_mapped (section
))
3106 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
3107 * then return its LOADED address rather than its vma address!!
3109 return overlay_unmapped_address (address
, section
);
3114 /* Function: find_pc_overlay (PC)
3115 Return the best-match overlay section for PC:
3116 If PC matches a mapped overlay section's VMA, return that section.
3117 Else if PC matches an unmapped section's VMA, return that section.
3118 Else if PC matches an unmapped section's LMA, return that section. */
3120 struct obj_section
*
3121 find_pc_overlay (CORE_ADDR pc
)
3123 struct objfile
*objfile
;
3124 struct obj_section
*osect
, *best_match
= NULL
;
3126 if (overlay_debugging
)
3127 ALL_OBJSECTIONS (objfile
, osect
)
3128 if (section_is_overlay (osect
))
3130 if (pc_in_mapped_range (pc
, osect
))
3132 if (section_is_mapped (osect
))
3137 else if (pc_in_unmapped_range (pc
, osect
))
3143 /* Function: find_pc_mapped_section (PC)
3144 If PC falls into the VMA address range of an overlay section that is
3145 currently marked as MAPPED, return that section. Else return NULL. */
3147 struct obj_section
*
3148 find_pc_mapped_section (CORE_ADDR pc
)
3150 struct objfile
*objfile
;
3151 struct obj_section
*osect
;
3153 if (overlay_debugging
)
3154 ALL_OBJSECTIONS (objfile
, osect
)
3155 if (pc_in_mapped_range (pc
, osect
) && section_is_mapped (osect
))
3161 /* Function: list_overlays_command
3162 Print a list of mapped sections and their PC ranges. */
3165 list_overlays_command (char *args
, int from_tty
)
3168 struct objfile
*objfile
;
3169 struct obj_section
*osect
;
3171 if (overlay_debugging
)
3172 ALL_OBJSECTIONS (objfile
, osect
)
3173 if (section_is_mapped (osect
))
3175 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
3180 vma
= bfd_section_vma (objfile
->obfd
, osect
->the_bfd_section
);
3181 lma
= bfd_section_lma (objfile
->obfd
, osect
->the_bfd_section
);
3182 size
= bfd_get_section_size (osect
->the_bfd_section
);
3183 name
= bfd_section_name (objfile
->obfd
, osect
->the_bfd_section
);
3185 printf_filtered ("Section %s, loaded at ", name
);
3186 fputs_filtered (paddress (gdbarch
, lma
), gdb_stdout
);
3187 puts_filtered (" - ");
3188 fputs_filtered (paddress (gdbarch
, lma
+ size
), gdb_stdout
);
3189 printf_filtered (", mapped at ");
3190 fputs_filtered (paddress (gdbarch
, vma
), gdb_stdout
);
3191 puts_filtered (" - ");
3192 fputs_filtered (paddress (gdbarch
, vma
+ size
), gdb_stdout
);
3193 puts_filtered ("\n");
3198 printf_filtered (_("No sections are mapped.\n"));
3201 /* Function: map_overlay_command
3202 Mark the named section as mapped (ie. residing at its VMA address). */
3205 map_overlay_command (char *args
, int from_tty
)
3207 struct objfile
*objfile
, *objfile2
;
3208 struct obj_section
*sec
, *sec2
;
3210 if (!overlay_debugging
)
3211 error (_("Overlay debugging not enabled. Use "
3212 "either the 'overlay auto' or\n"
3213 "the 'overlay manual' command."));
3215 if (args
== 0 || *args
== 0)
3216 error (_("Argument required: name of an overlay section"));
3218 /* First, find a section matching the user supplied argument. */
3219 ALL_OBJSECTIONS (objfile
, sec
)
3220 if (!strcmp (bfd_section_name (objfile
->obfd
, sec
->the_bfd_section
), args
))
3222 /* Now, check to see if the section is an overlay. */
3223 if (!section_is_overlay (sec
))
3224 continue; /* not an overlay section */
3226 /* Mark the overlay as "mapped". */
3227 sec
->ovly_mapped
= 1;
3229 /* Next, make a pass and unmap any sections that are
3230 overlapped by this new section: */
3231 ALL_OBJSECTIONS (objfile2
, sec2
)
3232 if (sec2
->ovly_mapped
&& sec
!= sec2
&& sections_overlap (sec
, sec2
))
3235 printf_unfiltered (_("Note: section %s unmapped by overlap\n"),
3236 bfd_section_name (objfile
->obfd
,
3237 sec2
->the_bfd_section
));
3238 sec2
->ovly_mapped
= 0; /* sec2 overlaps sec: unmap sec2. */
3242 error (_("No overlay section called %s"), args
);
3245 /* Function: unmap_overlay_command
3246 Mark the overlay section as unmapped
3247 (ie. resident in its LMA address range, rather than the VMA range). */
3250 unmap_overlay_command (char *args
, int from_tty
)
3252 struct objfile
*objfile
;
3253 struct obj_section
*sec
;
3255 if (!overlay_debugging
)
3256 error (_("Overlay debugging not enabled. "
3257 "Use either the 'overlay auto' or\n"
3258 "the 'overlay manual' command."));
3260 if (args
== 0 || *args
== 0)
3261 error (_("Argument required: name of an overlay section"));
3263 /* First, find a section matching the user supplied argument. */
3264 ALL_OBJSECTIONS (objfile
, sec
)
3265 if (!strcmp (bfd_section_name (objfile
->obfd
, sec
->the_bfd_section
), args
))
3267 if (!sec
->ovly_mapped
)
3268 error (_("Section %s is not mapped"), args
);
3269 sec
->ovly_mapped
= 0;
3272 error (_("No overlay section called %s"), args
);
3275 /* Function: overlay_auto_command
3276 A utility command to turn on overlay debugging.
3277 Possibly this should be done via a set/show command. */
3280 overlay_auto_command (char *args
, int from_tty
)
3282 overlay_debugging
= ovly_auto
;
3283 enable_overlay_breakpoints ();
3285 printf_unfiltered (_("Automatic overlay debugging enabled."));
3288 /* Function: overlay_manual_command
3289 A utility command to turn on overlay debugging.
3290 Possibly this should be done via a set/show command. */
3293 overlay_manual_command (char *args
, int from_tty
)
3295 overlay_debugging
= ovly_on
;
3296 disable_overlay_breakpoints ();
3298 printf_unfiltered (_("Overlay debugging enabled."));
3301 /* Function: overlay_off_command
3302 A utility command to turn on overlay debugging.
3303 Possibly this should be done via a set/show command. */
3306 overlay_off_command (char *args
, int from_tty
)
3308 overlay_debugging
= ovly_off
;
3309 disable_overlay_breakpoints ();
3311 printf_unfiltered (_("Overlay debugging disabled."));
3315 overlay_load_command (char *args
, int from_tty
)
3317 struct gdbarch
*gdbarch
= get_current_arch ();
3319 if (gdbarch_overlay_update_p (gdbarch
))
3320 gdbarch_overlay_update (gdbarch
, NULL
);
3322 error (_("This target does not know how to read its overlay state."));
3325 /* Function: overlay_command
3326 A place-holder for a mis-typed command. */
3328 /* Command list chain containing all defined "overlay" subcommands. */
3329 struct cmd_list_element
*overlaylist
;
3332 overlay_command (char *args
, int from_tty
)
3335 ("\"overlay\" must be followed by the name of an overlay command.\n");
3336 help_list (overlaylist
, "overlay ", -1, gdb_stdout
);
3340 /* Target Overlays for the "Simplest" overlay manager:
3342 This is GDB's default target overlay layer. It works with the
3343 minimal overlay manager supplied as an example by Cygnus. The
3344 entry point is via a function pointer "gdbarch_overlay_update",
3345 so targets that use a different runtime overlay manager can
3346 substitute their own overlay_update function and take over the
3349 The overlay_update function pokes around in the target's data structures
3350 to see what overlays are mapped, and updates GDB's overlay mapping with
3353 In this simple implementation, the target data structures are as follows:
3354 unsigned _novlys; /# number of overlay sections #/
3355 unsigned _ovly_table[_novlys][4] = {
3356 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
3357 {..., ..., ..., ...},
3359 unsigned _novly_regions; /# number of overlay regions #/
3360 unsigned _ovly_region_table[_novly_regions][3] = {
3361 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
3364 These functions will attempt to update GDB's mappedness state in the
3365 symbol section table, based on the target's mappedness state.
3367 To do this, we keep a cached copy of the target's _ovly_table, and
3368 attempt to detect when the cached copy is invalidated. The main
3369 entry point is "simple_overlay_update(SECT), which looks up SECT in
3370 the cached table and re-reads only the entry for that section from
3371 the target (whenever possible). */
3373 /* Cached, dynamically allocated copies of the target data structures: */
3374 static unsigned (*cache_ovly_table
)[4] = 0;
3375 static unsigned cache_novlys
= 0;
3376 static CORE_ADDR cache_ovly_table_base
= 0;
3379 VMA
, SIZE
, LMA
, MAPPED
3382 /* Throw away the cached copy of _ovly_table. */
3384 simple_free_overlay_table (void)
3386 if (cache_ovly_table
)
3387 xfree (cache_ovly_table
);
3389 cache_ovly_table
= NULL
;
3390 cache_ovly_table_base
= 0;
3393 /* Read an array of ints of size SIZE from the target into a local buffer.
3394 Convert to host order. int LEN is number of ints. */
3396 read_target_long_array (CORE_ADDR memaddr
, unsigned int *myaddr
,
3397 int len
, int size
, enum bfd_endian byte_order
)
3399 /* FIXME (alloca): Not safe if array is very large. */
3400 gdb_byte
*buf
= alloca (len
* size
);
3403 read_memory (memaddr
, buf
, len
* size
);
3404 for (i
= 0; i
< len
; i
++)
3405 myaddr
[i
] = extract_unsigned_integer (size
* i
+ buf
, size
, byte_order
);
3408 /* Find and grab a copy of the target _ovly_table
3409 (and _novlys, which is needed for the table's size). */
3411 simple_read_overlay_table (void)
3413 struct minimal_symbol
*novlys_msym
, *ovly_table_msym
;
3414 struct gdbarch
*gdbarch
;
3416 enum bfd_endian byte_order
;
3418 simple_free_overlay_table ();
3419 novlys_msym
= lookup_minimal_symbol ("_novlys", NULL
, NULL
);
3422 error (_("Error reading inferior's overlay table: "
3423 "couldn't find `_novlys' variable\n"
3424 "in inferior. Use `overlay manual' mode."));
3428 ovly_table_msym
= lookup_minimal_symbol ("_ovly_table", NULL
, NULL
);
3429 if (! ovly_table_msym
)
3431 error (_("Error reading inferior's overlay table: couldn't find "
3432 "`_ovly_table' array\n"
3433 "in inferior. Use `overlay manual' mode."));
3437 gdbarch
= get_objfile_arch (msymbol_objfile (ovly_table_msym
));
3438 word_size
= gdbarch_long_bit (gdbarch
) / TARGET_CHAR_BIT
;
3439 byte_order
= gdbarch_byte_order (gdbarch
);
3441 cache_novlys
= read_memory_integer (SYMBOL_VALUE_ADDRESS (novlys_msym
),
3444 = (void *) xmalloc (cache_novlys
* sizeof (*cache_ovly_table
));
3445 cache_ovly_table_base
= SYMBOL_VALUE_ADDRESS (ovly_table_msym
);
3446 read_target_long_array (cache_ovly_table_base
,
3447 (unsigned int *) cache_ovly_table
,
3448 cache_novlys
* 4, word_size
, byte_order
);
3450 return 1; /* SUCCESS */
3453 /* Function: simple_overlay_update_1
3454 A helper function for simple_overlay_update. Assuming a cached copy
3455 of _ovly_table exists, look through it to find an entry whose vma,
3456 lma and size match those of OSECT. Re-read the entry and make sure
3457 it still matches OSECT (else the table may no longer be valid).
3458 Set OSECT's mapped state to match the entry. Return: 1 for
3459 success, 0 for failure. */
3462 simple_overlay_update_1 (struct obj_section
*osect
)
3465 bfd
*obfd
= osect
->objfile
->obfd
;
3466 asection
*bsect
= osect
->the_bfd_section
;
3467 struct gdbarch
*gdbarch
= get_objfile_arch (osect
->objfile
);
3468 int word_size
= gdbarch_long_bit (gdbarch
) / TARGET_CHAR_BIT
;
3469 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
3471 size
= bfd_get_section_size (osect
->the_bfd_section
);
3472 for (i
= 0; i
< cache_novlys
; i
++)
3473 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3474 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3475 /* && cache_ovly_table[i][SIZE] == size */ )
3477 read_target_long_array (cache_ovly_table_base
+ i
* word_size
,
3478 (unsigned int *) cache_ovly_table
[i
],
3479 4, word_size
, byte_order
);
3480 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3481 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3482 /* && cache_ovly_table[i][SIZE] == size */ )
3484 osect
->ovly_mapped
= cache_ovly_table
[i
][MAPPED
];
3487 else /* Warning! Warning! Target's ovly table has changed! */
3493 /* Function: simple_overlay_update
3494 If OSECT is NULL, then update all sections' mapped state
3495 (after re-reading the entire target _ovly_table).
3496 If OSECT is non-NULL, then try to find a matching entry in the
3497 cached ovly_table and update only OSECT's mapped state.
3498 If a cached entry can't be found or the cache isn't valid, then
3499 re-read the entire cache, and go ahead and update all sections. */
3502 simple_overlay_update (struct obj_section
*osect
)
3504 struct objfile
*objfile
;
3506 /* Were we given an osect to look up? NULL means do all of them. */
3508 /* Have we got a cached copy of the target's overlay table? */
3509 if (cache_ovly_table
!= NULL
)
3511 /* Does its cached location match what's currently in the
3513 struct minimal_symbol
*minsym
3514 = lookup_minimal_symbol ("_ovly_table", NULL
, NULL
);
3517 error (_("Error reading inferior's overlay table: couldn't "
3518 "find `_ovly_table' array\n"
3519 "in inferior. Use `overlay manual' mode."));
3521 if (cache_ovly_table_base
== SYMBOL_VALUE_ADDRESS (minsym
))
3522 /* Then go ahead and try to look up this single section in
3524 if (simple_overlay_update_1 (osect
))
3525 /* Found it! We're done. */
3529 /* Cached table no good: need to read the entire table anew.
3530 Or else we want all the sections, in which case it's actually
3531 more efficient to read the whole table in one block anyway. */
3533 if (! simple_read_overlay_table ())
3536 /* Now may as well update all sections, even if only one was requested. */
3537 ALL_OBJSECTIONS (objfile
, osect
)
3538 if (section_is_overlay (osect
))
3541 bfd
*obfd
= osect
->objfile
->obfd
;
3542 asection
*bsect
= osect
->the_bfd_section
;
3544 size
= bfd_get_section_size (bsect
);
3545 for (i
= 0; i
< cache_novlys
; i
++)
3546 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3547 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3548 /* && cache_ovly_table[i][SIZE] == size */ )
3549 { /* obj_section matches i'th entry in ovly_table. */
3550 osect
->ovly_mapped
= cache_ovly_table
[i
][MAPPED
];
3551 break; /* finished with inner for loop: break out. */
3556 /* Set the output sections and output offsets for section SECTP in
3557 ABFD. The relocation code in BFD will read these offsets, so we
3558 need to be sure they're initialized. We map each section to itself,
3559 with no offset; this means that SECTP->vma will be honored. */
3562 symfile_dummy_outputs (bfd
*abfd
, asection
*sectp
, void *dummy
)
3564 sectp
->output_section
= sectp
;
3565 sectp
->output_offset
= 0;
3568 /* Default implementation for sym_relocate. */
3572 default_symfile_relocate (struct objfile
*objfile
, asection
*sectp
,
3575 bfd
*abfd
= objfile
->obfd
;
3577 /* We're only interested in sections with relocation
3579 if ((sectp
->flags
& SEC_RELOC
) == 0)
3582 /* We will handle section offsets properly elsewhere, so relocate as if
3583 all sections begin at 0. */
3584 bfd_map_over_sections (abfd
, symfile_dummy_outputs
, NULL
);
3586 return bfd_simple_get_relocated_section_contents (abfd
, sectp
, buf
, NULL
);
3589 /* Relocate the contents of a debug section SECTP in ABFD. The
3590 contents are stored in BUF if it is non-NULL, or returned in a
3591 malloc'd buffer otherwise.
3593 For some platforms and debug info formats, shared libraries contain
3594 relocations against the debug sections (particularly for DWARF-2;
3595 one affected platform is PowerPC GNU/Linux, although it depends on
3596 the version of the linker in use). Also, ELF object files naturally
3597 have unresolved relocations for their debug sections. We need to apply
3598 the relocations in order to get the locations of symbols correct.
3599 Another example that may require relocation processing, is the
3600 DWARF-2 .eh_frame section in .o files, although it isn't strictly a
3604 symfile_relocate_debug_section (struct objfile
*objfile
,
3605 asection
*sectp
, bfd_byte
*buf
)
3607 gdb_assert (objfile
->sf
->sym_relocate
);
3609 return (*objfile
->sf
->sym_relocate
) (objfile
, sectp
, buf
);
3612 struct symfile_segment_data
*
3613 get_symfile_segment_data (bfd
*abfd
)
3615 const struct sym_fns
*sf
= find_sym_fns (abfd
);
3620 return sf
->sym_segments (abfd
);
3624 free_symfile_segment_data (struct symfile_segment_data
*data
)
3626 xfree (data
->segment_bases
);
3627 xfree (data
->segment_sizes
);
3628 xfree (data
->segment_info
);
3634 - DATA, containing segment addresses from the object file ABFD, and
3635 the mapping from ABFD's sections onto the segments that own them,
3637 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual
3638 segment addresses reported by the target,
3639 store the appropriate offsets for each section in OFFSETS.
3641 If there are fewer entries in SEGMENT_BASES than there are segments
3642 in DATA, then apply SEGMENT_BASES' last entry to all the segments.
3644 If there are more entries, then ignore the extra. The target may
3645 not be able to distinguish between an empty data segment and a
3646 missing data segment; a missing text segment is less plausible. */
3648 symfile_map_offsets_to_segments (bfd
*abfd
, struct symfile_segment_data
*data
,
3649 struct section_offsets
*offsets
,
3650 int num_segment_bases
,
3651 const CORE_ADDR
*segment_bases
)
3656 /* It doesn't make sense to call this function unless you have some
3657 segment base addresses. */
3658 gdb_assert (num_segment_bases
> 0);
3660 /* If we do not have segment mappings for the object file, we
3661 can not relocate it by segments. */
3662 gdb_assert (data
!= NULL
);
3663 gdb_assert (data
->num_segments
> 0);
3665 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
3667 int which
= data
->segment_info
[i
];
3669 gdb_assert (0 <= which
&& which
<= data
->num_segments
);
3671 /* Don't bother computing offsets for sections that aren't
3672 loaded as part of any segment. */
3676 /* Use the last SEGMENT_BASES entry as the address of any extra
3677 segments mentioned in DATA->segment_info. */
3678 if (which
> num_segment_bases
)
3679 which
= num_segment_bases
;
3681 offsets
->offsets
[i
] = (segment_bases
[which
- 1]
3682 - data
->segment_bases
[which
- 1]);
3689 symfile_find_segment_sections (struct objfile
*objfile
)
3691 bfd
*abfd
= objfile
->obfd
;
3694 struct symfile_segment_data
*data
;
3696 data
= get_symfile_segment_data (objfile
->obfd
);
3700 if (data
->num_segments
!= 1 && data
->num_segments
!= 2)
3702 free_symfile_segment_data (data
);
3706 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
3708 int which
= data
->segment_info
[i
];
3712 if (objfile
->sect_index_text
== -1)
3713 objfile
->sect_index_text
= sect
->index
;
3715 if (objfile
->sect_index_rodata
== -1)
3716 objfile
->sect_index_rodata
= sect
->index
;
3718 else if (which
== 2)
3720 if (objfile
->sect_index_data
== -1)
3721 objfile
->sect_index_data
= sect
->index
;
3723 if (objfile
->sect_index_bss
== -1)
3724 objfile
->sect_index_bss
= sect
->index
;
3728 free_symfile_segment_data (data
);
3732 _initialize_symfile (void)
3734 struct cmd_list_element
*c
;
3736 c
= add_cmd ("symbol-file", class_files
, symbol_file_command
, _("\
3737 Load symbol table from executable file FILE.\n\
3738 The `file' command can also load symbol tables, as well as setting the file\n\
3739 to execute."), &cmdlist
);
3740 set_cmd_completer (c
, filename_completer
);
3742 c
= add_cmd ("add-symbol-file", class_files
, add_symbol_file_command
, _("\
3743 Load symbols from FILE, assuming FILE has been dynamically loaded.\n\
3744 Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR>\
3745 ...]\nADDR is the starting address of the file's text.\n\
3746 The optional arguments are section-name section-address pairs and\n\
3747 should be specified if the data and bss segments are not contiguous\n\
3748 with the text. SECT is a section name to be loaded at SECT_ADDR."),
3750 set_cmd_completer (c
, filename_completer
);
3752 c
= add_cmd ("load", class_files
, load_command
, _("\
3753 Dynamically load FILE into the running program, and record its symbols\n\
3754 for access from GDB.\n\
3755 A load OFFSET may also be given."), &cmdlist
);
3756 set_cmd_completer (c
, filename_completer
);
3758 add_setshow_boolean_cmd ("symbol-reloading", class_support
,
3759 &symbol_reloading
, _("\
3760 Set dynamic symbol table reloading multiple times in one run."), _("\
3761 Show dynamic symbol table reloading multiple times in one run."), NULL
,
3763 show_symbol_reloading
,
3764 &setlist
, &showlist
);
3766 add_prefix_cmd ("overlay", class_support
, overlay_command
,
3767 _("Commands for debugging overlays."), &overlaylist
,
3768 "overlay ", 0, &cmdlist
);
3770 add_com_alias ("ovly", "overlay", class_alias
, 1);
3771 add_com_alias ("ov", "overlay", class_alias
, 1);
3773 add_cmd ("map-overlay", class_support
, map_overlay_command
,
3774 _("Assert that an overlay section is mapped."), &overlaylist
);
3776 add_cmd ("unmap-overlay", class_support
, unmap_overlay_command
,
3777 _("Assert that an overlay section is unmapped."), &overlaylist
);
3779 add_cmd ("list-overlays", class_support
, list_overlays_command
,
3780 _("List mappings of overlay sections."), &overlaylist
);
3782 add_cmd ("manual", class_support
, overlay_manual_command
,
3783 _("Enable overlay debugging."), &overlaylist
);
3784 add_cmd ("off", class_support
, overlay_off_command
,
3785 _("Disable overlay debugging."), &overlaylist
);
3786 add_cmd ("auto", class_support
, overlay_auto_command
,
3787 _("Enable automatic overlay debugging."), &overlaylist
);
3788 add_cmd ("load-target", class_support
, overlay_load_command
,
3789 _("Read the overlay mapping state from the target."), &overlaylist
);
3791 /* Filename extension to source language lookup table: */
3792 init_filename_language_table ();
3793 add_setshow_string_noescape_cmd ("extension-language", class_files
,
3795 Set mapping between filename extension and source language."), _("\
3796 Show mapping between filename extension and source language."), _("\
3797 Usage: set extension-language .foo bar"),
3798 set_ext_lang_command
,
3800 &setlist
, &showlist
);
3802 add_info ("extensions", info_ext_lang_command
,
3803 _("All filename extensions associated with a source language."));
3805 add_setshow_optional_filename_cmd ("debug-file-directory", class_support
,
3806 &debug_file_directory
, _("\
3807 Set the directories where separate debug symbols are searched for."), _("\
3808 Show the directories where separate debug symbols are searched for."), _("\
3809 Separate debug symbols are first searched for in the same\n\
3810 directory as the binary, then in the `" DEBUG_SUBDIRECTORY
"' subdirectory,\n\
3811 and lastly at the path of the directory of the binary with\n\
3812 each global debug-file-directory component prepended."),
3814 show_debug_file_directory
,
3815 &setlist
, &showlist
);