1 /* Generic symbol file reading for the GNU debugger, GDB.
3 Copyright (C) 1990-2012 Free Software Foundation, Inc.
5 Contributed by Cygnus Support, using pieces from other GDB modules.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "arch-utils.h"
35 #include "breakpoint.h"
37 #include "complaints.h"
41 #include "filenames.h" /* for DOSish file names */
42 #include "gdb-stabs.h"
43 #include "gdb_obstack.h"
44 #include "completer.h"
47 #include "readline/readline.h"
48 #include "gdb_assert.h"
52 #include "parser-defs.h"
59 #include <sys/types.h>
61 #include "gdb_string.h"
69 int (*deprecated_ui_load_progress_hook) (const char *section,
71 void (*deprecated_show_load_progress) (const char *section,
72 unsigned long section_sent,
73 unsigned long section_size,
74 unsigned long total_sent,
75 unsigned long total_size);
76 void (*deprecated_pre_add_symbol_hook) (const char *);
77 void (*deprecated_post_add_symbol_hook) (void);
79 static void clear_symtab_users_cleanup (void *ignore);
81 /* Global variables owned by this file. */
82 int readnow_symbol_files; /* Read full symbols immediately. */
84 /* External variables and functions referenced. */
86 extern void report_transfer_performance (unsigned long, time_t, time_t);
88 /* Functions this file defines. */
90 static void load_command (char *, int);
92 static void symbol_file_add_main_1 (char *args, int from_tty, int flags);
94 static void add_symbol_file_command (char *, int);
96 bfd *symfile_bfd_open (char *);
98 int get_section_index (struct objfile *, char *);
100 static const struct sym_fns *find_sym_fns (bfd *);
102 static void decrement_reading_symtab (void *);
104 static void overlay_invalidate_all (void);
106 void list_overlays_command (char *, int);
108 void map_overlay_command (char *, int);
110 void unmap_overlay_command (char *, int);
112 static void overlay_auto_command (char *, int);
114 static void overlay_manual_command (char *, int);
116 static void overlay_off_command (char *, int);
118 static void overlay_load_command (char *, int);
120 static void overlay_command (char *, int);
122 static void simple_free_overlay_table (void);
124 static void read_target_long_array (CORE_ADDR, unsigned int *, int, int,
127 static int simple_read_overlay_table (void);
129 static int simple_overlay_update_1 (struct obj_section *);
131 static void add_filename_language (char *ext, enum language lang);
133 static void info_ext_lang_command (char *args, int from_tty);
135 static void init_filename_language_table (void);
137 static void symfile_find_segment_sections (struct objfile *objfile);
139 void _initialize_symfile (void);
141 /* List of all available sym_fns. On gdb startup, each object file reader
142 calls add_symtab_fns() to register information on each format it is
145 typedef const struct sym_fns *sym_fns_ptr;
146 DEF_VEC_P (sym_fns_ptr);
148 static VEC (sym_fns_ptr) *symtab_fns = NULL;
150 /* Flag for whether user will be reloading symbols multiple times.
151 Defaults to ON for VxWorks, otherwise OFF. */
153 #ifdef SYMBOL_RELOADING_DEFAULT
154 int symbol_reloading = SYMBOL_RELOADING_DEFAULT;
156 int symbol_reloading = 0;
159 show_symbol_reloading (struct ui_file *file, int from_tty,
160 struct cmd_list_element *c, const char *value)
162 fprintf_filtered (file, _("Dynamic symbol table reloading "
163 "multiple times in one run is %s.\n"),
167 /* If non-zero, shared library symbols will be added automatically
168 when the inferior is created, new libraries are loaded, or when
169 attaching to the inferior. This is almost always what users will
170 want to have happen; but for very large programs, the startup time
171 will be excessive, and so if this is a problem, the user can clear
172 this flag and then add the shared library symbols as needed. Note
173 that there is a potential for confusion, since if the shared
174 library symbols are not loaded, commands like "info fun" will *not*
175 report all the functions that are actually present. */
177 int auto_solib_add = 1;
180 /* Make a null terminated copy of the string at PTR with SIZE characters in
181 the obstack pointed to by OBSTACKP . Returns the address of the copy.
182 Note that the string at PTR does not have to be null terminated, I.e. it
183 may be part of a larger string and we are only saving a substring. */
186 obsavestring (const char *ptr, int size, struct obstack *obstackp)
188 char *p = (char *) obstack_alloc (obstackp, size + 1);
189 /* Open-coded memcpy--saves function call time. These strings are usually
190 short. FIXME: Is this really still true with a compiler that can
193 const char *p1 = ptr;
195 const char *end = ptr + size;
204 /* Concatenate NULL terminated variable argument list of `const char *'
205 strings; return the new string. Space is found in the OBSTACKP.
206 Argument list must be terminated by a sentinel expression `(char *)
210 obconcat (struct obstack *obstackp, ...)
214 va_start (ap, obstackp);
217 const char *s = va_arg (ap, const char *);
222 obstack_grow_str (obstackp, s);
225 obstack_1grow (obstackp, 0);
227 return obstack_finish (obstackp);
230 /* True if we are reading a symbol table. */
232 int currently_reading_symtab = 0;
235 decrement_reading_symtab (void *dummy)
237 currently_reading_symtab--;
240 /* Increment currently_reading_symtab and return a cleanup that can be
241 used to decrement it. */
243 increment_reading_symtab (void)
245 ++currently_reading_symtab;
246 return make_cleanup (decrement_reading_symtab, NULL);
249 /* Remember the lowest-addressed loadable section we've seen.
250 This function is called via bfd_map_over_sections.
252 In case of equal vmas, the section with the largest size becomes the
253 lowest-addressed loadable section.
255 If the vmas and sizes are equal, the last section is considered the
256 lowest-addressed loadable section. */
259 find_lowest_section (bfd *abfd, asection *sect, void *obj)
261 asection **lowest = (asection **) obj;
263 if (0 == (bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD)))
266 *lowest = sect; /* First loadable section */
267 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
268 *lowest = sect; /* A lower loadable section */
269 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
270 && (bfd_section_size (abfd, (*lowest))
271 <= bfd_section_size (abfd, sect)))
275 /* Create a new section_addr_info, with room for NUM_SECTIONS. */
277 struct section_addr_info *
278 alloc_section_addr_info (size_t num_sections)
280 struct section_addr_info *sap;
283 size = (sizeof (struct section_addr_info)
284 + sizeof (struct other_sections) * (num_sections - 1));
285 sap = (struct section_addr_info *) xmalloc (size);
286 memset (sap, 0, size);
287 sap->num_sections = num_sections;
292 /* Build (allocate and populate) a section_addr_info struct from
293 an existing section table. */
295 extern struct section_addr_info *
296 build_section_addr_info_from_section_table (const struct target_section *start,
297 const struct target_section *end)
299 struct section_addr_info *sap;
300 const struct target_section *stp;
303 sap = alloc_section_addr_info (end - start);
305 for (stp = start, oidx = 0; stp != end; stp++)
307 if (bfd_get_section_flags (stp->bfd,
308 stp->the_bfd_section) & (SEC_ALLOC | SEC_LOAD)
309 && oidx < end - start)
311 sap->other[oidx].addr = stp->addr;
312 sap->other[oidx].name
313 = xstrdup (bfd_section_name (stp->bfd, stp->the_bfd_section));
314 sap->other[oidx].sectindex = stp->the_bfd_section->index;
322 /* Create a section_addr_info from section offsets in ABFD. */
324 static struct section_addr_info *
325 build_section_addr_info_from_bfd (bfd *abfd)
327 struct section_addr_info *sap;
329 struct bfd_section *sec;
331 sap = alloc_section_addr_info (bfd_count_sections (abfd));
332 for (i = 0, sec = abfd->sections; sec != NULL; sec = sec->next)
333 if (bfd_get_section_flags (abfd, sec) & (SEC_ALLOC | SEC_LOAD))
335 sap->other[i].addr = bfd_get_section_vma (abfd, sec);
336 sap->other[i].name = xstrdup (bfd_get_section_name (abfd, sec));
337 sap->other[i].sectindex = sec->index;
343 /* Create a section_addr_info from section offsets in OBJFILE. */
345 struct section_addr_info *
346 build_section_addr_info_from_objfile (const struct objfile *objfile)
348 struct section_addr_info *sap;
351 /* Before reread_symbols gets rewritten it is not safe to call:
352 gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd));
354 sap = build_section_addr_info_from_bfd (objfile->obfd);
355 for (i = 0; i < sap->num_sections && sap->other[i].name; i++)
357 int sectindex = sap->other[i].sectindex;
359 sap->other[i].addr += objfile->section_offsets->offsets[sectindex];
364 /* Free all memory allocated by build_section_addr_info_from_section_table. */
367 free_section_addr_info (struct section_addr_info *sap)
371 for (idx = 0; idx < sap->num_sections; idx++)
372 if (sap->other[idx].name)
373 xfree (sap->other[idx].name);
378 /* Initialize OBJFILE's sect_index_* members. */
380 init_objfile_sect_indices (struct objfile *objfile)
385 sect = bfd_get_section_by_name (objfile->obfd, ".text");
387 objfile->sect_index_text = sect->index;
389 sect = bfd_get_section_by_name (objfile->obfd, ".data");
391 objfile->sect_index_data = sect->index;
393 sect = bfd_get_section_by_name (objfile->obfd, ".bss");
395 objfile->sect_index_bss = sect->index;
397 sect = bfd_get_section_by_name (objfile->obfd, ".rodata");
399 objfile->sect_index_rodata = sect->index;
401 /* This is where things get really weird... We MUST have valid
402 indices for the various sect_index_* members or gdb will abort.
403 So if for example, there is no ".text" section, we have to
404 accomodate that. First, check for a file with the standard
405 one or two segments. */
407 symfile_find_segment_sections (objfile);
409 /* Except when explicitly adding symbol files at some address,
410 section_offsets contains nothing but zeros, so it doesn't matter
411 which slot in section_offsets the individual sect_index_* members
412 index into. So if they are all zero, it is safe to just point
413 all the currently uninitialized indices to the first slot. But
414 beware: if this is the main executable, it may be relocated
415 later, e.g. by the remote qOffsets packet, and then this will
416 be wrong! That's why we try segments first. */
418 for (i = 0; i < objfile->num_sections; i++)
420 if (ANOFFSET (objfile->section_offsets, i) != 0)
425 if (i == objfile->num_sections)
427 if (objfile->sect_index_text == -1)
428 objfile->sect_index_text = 0;
429 if (objfile->sect_index_data == -1)
430 objfile->sect_index_data = 0;
431 if (objfile->sect_index_bss == -1)
432 objfile->sect_index_bss = 0;
433 if (objfile->sect_index_rodata == -1)
434 objfile->sect_index_rodata = 0;
438 /* The arguments to place_section. */
440 struct place_section_arg
442 struct section_offsets *offsets;
446 /* Find a unique offset to use for loadable section SECT if
447 the user did not provide an offset. */
450 place_section (bfd *abfd, asection *sect, void *obj)
452 struct place_section_arg *arg = obj;
453 CORE_ADDR *offsets = arg->offsets->offsets, start_addr;
455 ULONGEST align = ((ULONGEST) 1) << bfd_get_section_alignment (abfd, sect);
457 /* We are only interested in allocated sections. */
458 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
461 /* If the user specified an offset, honor it. */
462 if (offsets[sect->index] != 0)
465 /* Otherwise, let's try to find a place for the section. */
466 start_addr = (arg->lowest + align - 1) & -align;
473 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
475 int indx = cur_sec->index;
477 /* We don't need to compare against ourself. */
481 /* We can only conflict with allocated sections. */
482 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
485 /* If the section offset is 0, either the section has not been placed
486 yet, or it was the lowest section placed (in which case LOWEST
487 will be past its end). */
488 if (offsets[indx] == 0)
491 /* If this section would overlap us, then we must move up. */
492 if (start_addr + bfd_get_section_size (sect) > offsets[indx]
493 && start_addr < offsets[indx] + bfd_get_section_size (cur_sec))
495 start_addr = offsets[indx] + bfd_get_section_size (cur_sec);
496 start_addr = (start_addr + align - 1) & -align;
501 /* Otherwise, we appear to be OK. So far. */
506 offsets[sect->index] = start_addr;
507 arg->lowest = start_addr + bfd_get_section_size (sect);
510 /* Store struct section_addr_info as prepared (made relative and with SECTINDEX
511 filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS
515 relative_addr_info_to_section_offsets (struct section_offsets *section_offsets,
517 struct section_addr_info *addrs)
521 memset (section_offsets, 0, SIZEOF_N_SECTION_OFFSETS (num_sections));
523 /* Now calculate offsets for section that were specified by the caller. */
524 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
526 struct other_sections *osp;
528 osp = &addrs->other[i];
529 if (osp->sectindex == -1)
532 /* Record all sections in offsets. */
533 /* The section_offsets in the objfile are here filled in using
535 section_offsets->offsets[osp->sectindex] = osp->addr;
539 /* Transform section name S for a name comparison. prelink can split section
540 `.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly
541 prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address
542 of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss'
543 (`.sbss') section has invalid (increased) virtual address. */
546 addr_section_name (const char *s)
548 if (strcmp (s, ".dynbss") == 0)
550 if (strcmp (s, ".sdynbss") == 0)
556 /* qsort comparator for addrs_section_sort. Sort entries in ascending order by
557 their (name, sectindex) pair. sectindex makes the sort by name stable. */
560 addrs_section_compar (const void *ap, const void *bp)
562 const struct other_sections *a = *((struct other_sections **) ap);
563 const struct other_sections *b = *((struct other_sections **) bp);
564 int retval, a_idx, b_idx;
566 retval = strcmp (addr_section_name (a->name), addr_section_name (b->name));
570 return a->sectindex - b->sectindex;
573 /* Provide sorted array of pointers to sections of ADDRS. The array is
574 terminated by NULL. Caller is responsible to call xfree for it. */
576 static struct other_sections **
577 addrs_section_sort (struct section_addr_info *addrs)
579 struct other_sections **array;
582 /* `+ 1' for the NULL terminator. */
583 array = xmalloc (sizeof (*array) * (addrs->num_sections + 1));
584 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
585 array[i] = &addrs->other[i];
588 qsort (array, i, sizeof (*array), addrs_section_compar);
593 /* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in
594 also SECTINDEXes specific to ABFD there. This function can be used to
595 rebase ADDRS to start referencing different BFD than before. */
598 addr_info_make_relative (struct section_addr_info *addrs, bfd *abfd)
600 asection *lower_sect;
601 CORE_ADDR lower_offset;
603 struct cleanup *my_cleanup;
604 struct section_addr_info *abfd_addrs;
605 struct other_sections **addrs_sorted, **abfd_addrs_sorted;
606 struct other_sections **addrs_to_abfd_addrs;
608 /* Find lowest loadable section to be used as starting point for
609 continguous sections. */
611 bfd_map_over_sections (abfd, find_lowest_section, &lower_sect);
612 if (lower_sect == NULL)
614 warning (_("no loadable sections found in added symbol-file %s"),
615 bfd_get_filename (abfd));
619 lower_offset = bfd_section_vma (bfd_get_filename (abfd), lower_sect);
621 /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections
622 in ABFD. Section names are not unique - there can be multiple sections of
623 the same name. Also the sections of the same name do not have to be
624 adjacent to each other. Some sections may be present only in one of the
625 files. Even sections present in both files do not have to be in the same
628 Use stable sort by name for the sections in both files. Then linearly
629 scan both lists matching as most of the entries as possible. */
631 addrs_sorted = addrs_section_sort (addrs);
632 my_cleanup = make_cleanup (xfree, addrs_sorted);
634 abfd_addrs = build_section_addr_info_from_bfd (abfd);
635 make_cleanup_free_section_addr_info (abfd_addrs);
636 abfd_addrs_sorted = addrs_section_sort (abfd_addrs);
637 make_cleanup (xfree, abfd_addrs_sorted);
639 /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and
640 ABFD_ADDRS_SORTED. */
642 addrs_to_abfd_addrs = xzalloc (sizeof (*addrs_to_abfd_addrs)
643 * addrs->num_sections);
644 make_cleanup (xfree, addrs_to_abfd_addrs);
646 while (*addrs_sorted)
648 const char *sect_name = addr_section_name ((*addrs_sorted)->name);
650 while (*abfd_addrs_sorted
651 && strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
655 if (*abfd_addrs_sorted
656 && strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
661 /* Make the found item directly addressable from ADDRS. */
662 index_in_addrs = *addrs_sorted - addrs->other;
663 gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL);
664 addrs_to_abfd_addrs[index_in_addrs] = *abfd_addrs_sorted;
666 /* Never use the same ABFD entry twice. */
673 /* Calculate offsets for the loadable sections.
674 FIXME! Sections must be in order of increasing loadable section
675 so that contiguous sections can use the lower-offset!!!
677 Adjust offsets if the segments are not contiguous.
678 If the section is contiguous, its offset should be set to
679 the offset of the highest loadable section lower than it
680 (the loadable section directly below it in memory).
681 this_offset = lower_offset = lower_addr - lower_orig_addr */
683 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
685 struct other_sections *sect = addrs_to_abfd_addrs[i];
689 /* This is the index used by BFD. */
690 addrs->other[i].sectindex = sect->sectindex;
692 if (addrs->other[i].addr != 0)
694 addrs->other[i].addr -= sect->addr;
695 lower_offset = addrs->other[i].addr;
698 addrs->other[i].addr = lower_offset;
702 /* addr_section_name transformation is not used for SECT_NAME. */
703 const char *sect_name = addrs->other[i].name;
705 /* This section does not exist in ABFD, which is normally
706 unexpected and we want to issue a warning.
708 However, the ELF prelinker does create a few sections which are
709 marked in the main executable as loadable (they are loaded in
710 memory from the DYNAMIC segment) and yet are not present in
711 separate debug info files. This is fine, and should not cause
712 a warning. Shared libraries contain just the section
713 ".gnu.liblist" but it is not marked as loadable there. There is
714 no other way to identify them than by their name as the sections
715 created by prelink have no special flags.
717 For the sections `.bss' and `.sbss' see addr_section_name. */
719 if (!(strcmp (sect_name, ".gnu.liblist") == 0
720 || strcmp (sect_name, ".gnu.conflict") == 0
721 || (strcmp (sect_name, ".bss") == 0
723 && strcmp (addrs->other[i - 1].name, ".dynbss") == 0
724 && addrs_to_abfd_addrs[i - 1] != NULL)
725 || (strcmp (sect_name, ".sbss") == 0
727 && strcmp (addrs->other[i - 1].name, ".sdynbss") == 0
728 && addrs_to_abfd_addrs[i - 1] != NULL)))
729 warning (_("section %s not found in %s"), sect_name,
730 bfd_get_filename (abfd));
732 addrs->other[i].addr = 0;
733 addrs->other[i].sectindex = -1;
737 do_cleanups (my_cleanup);
740 /* Parse the user's idea of an offset for dynamic linking, into our idea
741 of how to represent it for fast symbol reading. This is the default
742 version of the sym_fns.sym_offsets function for symbol readers that
743 don't need to do anything special. It allocates a section_offsets table
744 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
747 default_symfile_offsets (struct objfile *objfile,
748 struct section_addr_info *addrs)
750 objfile->num_sections = bfd_count_sections (objfile->obfd);
751 objfile->section_offsets = (struct section_offsets *)
752 obstack_alloc (&objfile->objfile_obstack,
753 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
754 relative_addr_info_to_section_offsets (objfile->section_offsets,
755 objfile->num_sections, addrs);
757 /* For relocatable files, all loadable sections will start at zero.
758 The zero is meaningless, so try to pick arbitrary addresses such
759 that no loadable sections overlap. This algorithm is quadratic,
760 but the number of sections in a single object file is generally
762 if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0)
764 struct place_section_arg arg;
765 bfd *abfd = objfile->obfd;
768 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
769 /* We do not expect this to happen; just skip this step if the
770 relocatable file has a section with an assigned VMA. */
771 if (bfd_section_vma (abfd, cur_sec) != 0)
776 CORE_ADDR *offsets = objfile->section_offsets->offsets;
778 /* Pick non-overlapping offsets for sections the user did not
780 arg.offsets = objfile->section_offsets;
782 bfd_map_over_sections (objfile->obfd, place_section, &arg);
784 /* Correctly filling in the section offsets is not quite
785 enough. Relocatable files have two properties that
786 (most) shared objects do not:
788 - Their debug information will contain relocations. Some
789 shared libraries do also, but many do not, so this can not
792 - If there are multiple code sections they will be loaded
793 at different relative addresses in memory than they are
794 in the objfile, since all sections in the file will start
797 Because GDB has very limited ability to map from an
798 address in debug info to the correct code section,
799 it relies on adding SECT_OFF_TEXT to things which might be
800 code. If we clear all the section offsets, and set the
801 section VMAs instead, then symfile_relocate_debug_section
802 will return meaningful debug information pointing at the
805 GDB has too many different data structures for section
806 addresses - a bfd, objfile, and so_list all have section
807 tables, as does exec_ops. Some of these could probably
810 for (cur_sec = abfd->sections; cur_sec != NULL;
811 cur_sec = cur_sec->next)
813 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
816 bfd_set_section_vma (abfd, cur_sec, offsets[cur_sec->index]);
817 exec_set_section_address (bfd_get_filename (abfd),
819 offsets[cur_sec->index]);
820 offsets[cur_sec->index] = 0;
825 /* Remember the bfd indexes for the .text, .data, .bss and
827 init_objfile_sect_indices (objfile);
831 /* Divide the file into segments, which are individual relocatable units.
832 This is the default version of the sym_fns.sym_segments function for
833 symbol readers that do not have an explicit representation of segments.
834 It assumes that object files do not have segments, and fully linked
835 files have a single segment. */
837 struct symfile_segment_data *
838 default_symfile_segments (bfd *abfd)
842 struct symfile_segment_data *data;
845 /* Relocatable files contain enough information to position each
846 loadable section independently; they should not be relocated
848 if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0)
851 /* Make sure there is at least one loadable section in the file. */
852 for (sect = abfd->sections; sect != NULL; sect = sect->next)
854 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
862 low = bfd_get_section_vma (abfd, sect);
863 high = low + bfd_get_section_size (sect);
865 data = XZALLOC (struct symfile_segment_data);
866 data->num_segments = 1;
867 data->segment_bases = XCALLOC (1, CORE_ADDR);
868 data->segment_sizes = XCALLOC (1, CORE_ADDR);
870 num_sections = bfd_count_sections (abfd);
871 data->segment_info = XCALLOC (num_sections, int);
873 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
877 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
880 vma = bfd_get_section_vma (abfd, sect);
883 if (vma + bfd_get_section_size (sect) > high)
884 high = vma + bfd_get_section_size (sect);
886 data->segment_info[i] = 1;
889 data->segment_bases[0] = low;
890 data->segment_sizes[0] = high - low;
895 /* Process a symbol file, as either the main file or as a dynamically
898 OBJFILE is where the symbols are to be read from.
900 ADDRS is the list of section load addresses. If the user has given
901 an 'add-symbol-file' command, then this is the list of offsets and
902 addresses he or she provided as arguments to the command; or, if
903 we're handling a shared library, these are the actual addresses the
904 sections are loaded at, according to the inferior's dynamic linker
905 (as gleaned by GDB's shared library code). We convert each address
906 into an offset from the section VMA's as it appears in the object
907 file, and then call the file's sym_offsets function to convert this
908 into a format-specific offset table --- a `struct section_offsets'.
909 If ADDRS is non-zero, OFFSETS must be zero.
911 OFFSETS is a table of section offsets already in the right
912 format-specific representation. NUM_OFFSETS is the number of
913 elements present in OFFSETS->offsets. If OFFSETS is non-zero, we
914 assume this is the proper table the call to sym_offsets described
915 above would produce. Instead of calling sym_offsets, we just dump
916 it right into objfile->section_offsets. (When we're re-reading
917 symbols from an objfile, we don't have the original load address
918 list any more; all we have is the section offset table.) If
919 OFFSETS is non-zero, ADDRS must be zero.
921 ADD_FLAGS encodes verbosity level, whether this is main symbol or
922 an extra symbol file such as dynamically loaded code, and wether
923 breakpoint reset should be deferred. */
926 syms_from_objfile (struct objfile *objfile,
927 struct section_addr_info *addrs,
928 struct section_offsets *offsets,
932 struct section_addr_info *local_addr = NULL;
933 struct cleanup *old_chain;
934 const int mainline = add_flags & SYMFILE_MAINLINE;
936 gdb_assert (! (addrs && offsets));
938 init_entry_point_info (objfile);
939 objfile->sf = find_sym_fns (objfile->obfd);
941 if (objfile->sf == NULL)
942 return; /* No symbols. */
944 /* Make sure that partially constructed symbol tables will be cleaned up
945 if an error occurs during symbol reading. */
946 old_chain = make_cleanup_free_objfile (objfile);
948 /* If ADDRS and OFFSETS are both NULL, put together a dummy address
949 list. We now establish the convention that an addr of zero means
950 no load address was specified. */
951 if (! addrs && ! offsets)
954 = alloc_section_addr_info (bfd_count_sections (objfile->obfd));
955 make_cleanup (xfree, local_addr);
959 /* Now either addrs or offsets is non-zero. */
963 /* We will modify the main symbol table, make sure that all its users
964 will be cleaned up if an error occurs during symbol reading. */
965 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);
967 /* Since no error yet, throw away the old symbol table. */
969 if (symfile_objfile != NULL)
971 free_objfile (symfile_objfile);
972 gdb_assert (symfile_objfile == NULL);
975 /* Currently we keep symbols from the add-symbol-file command.
976 If the user wants to get rid of them, they should do "symbol-file"
977 without arguments first. Not sure this is the best behavior
980 (*objfile->sf->sym_new_init) (objfile);
983 /* Convert addr into an offset rather than an absolute address.
984 We find the lowest address of a loaded segment in the objfile,
985 and assume that <addr> is where that got loaded.
987 We no longer warn if the lowest section is not a text segment (as
988 happens for the PA64 port. */
989 if (addrs && addrs->other[0].name)
990 addr_info_make_relative (addrs, objfile->obfd);
992 /* Initialize symbol reading routines for this objfile, allow complaints to
993 appear for this new file, and record how verbose to be, then do the
994 initial symbol reading for this file. */
996 (*objfile->sf->sym_init) (objfile);
997 clear_complaints (&symfile_complaints, 1, add_flags & SYMFILE_VERBOSE);
1000 (*objfile->sf->sym_offsets) (objfile, addrs);
1003 size_t size = SIZEOF_N_SECTION_OFFSETS (num_offsets);
1005 /* Just copy in the offset table directly as given to us. */
1006 objfile->num_sections = num_offsets;
1007 objfile->section_offsets
1008 = ((struct section_offsets *)
1009 obstack_alloc (&objfile->objfile_obstack, size));
1010 memcpy (objfile->section_offsets, offsets, size);
1012 init_objfile_sect_indices (objfile);
1015 (*objfile->sf->sym_read) (objfile, add_flags);
1017 if ((add_flags & SYMFILE_NO_READ) == 0)
1018 require_partial_symbols (objfile, 0);
1020 /* Discard cleanups as symbol reading was successful. */
1022 discard_cleanups (old_chain);
1026 /* Perform required actions after either reading in the initial
1027 symbols for a new objfile, or mapping in the symbols from a reusable
1028 objfile. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
1031 new_symfile_objfile (struct objfile *objfile, int add_flags)
1033 /* If this is the main symbol file we have to clean up all users of the
1034 old main symbol file. Otherwise it is sufficient to fixup all the
1035 breakpoints that may have been redefined by this symbol file. */
1036 if (add_flags & SYMFILE_MAINLINE)
1038 /* OK, make it the "real" symbol file. */
1039 symfile_objfile = objfile;
1041 clear_symtab_users (add_flags);
1043 else if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0)
1045 breakpoint_re_set ();
1048 /* We're done reading the symbol file; finish off complaints. */
1049 clear_complaints (&symfile_complaints, 0, add_flags & SYMFILE_VERBOSE);
1052 /* Process a symbol file, as either the main file or as a dynamically
1055 ABFD is a BFD already open on the file, as from symfile_bfd_open.
1056 This BFD will be closed on error, and is always consumed by this function.
1058 ADD_FLAGS encodes verbosity, whether this is main symbol file or
1059 extra, such as dynamically loaded code, and what to do with breakpoins.
1061 ADDRS, OFFSETS, and NUM_OFFSETS are as described for
1062 syms_from_objfile, above.
1063 ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS.
1065 PARENT is the original objfile if ABFD is a separate debug info file.
1066 Otherwise PARENT is NULL.
1068 Upon success, returns a pointer to the objfile that was added.
1069 Upon failure, jumps back to command level (never returns). */
1071 static struct objfile *
1072 symbol_file_add_with_addrs_or_offsets (bfd *abfd,
1074 struct section_addr_info *addrs,
1075 struct section_offsets *offsets,
1077 int flags, struct objfile *parent)
1079 struct objfile *objfile;
1080 struct cleanup *my_cleanups;
1081 const char *name = bfd_get_filename (abfd);
1082 const int from_tty = add_flags & SYMFILE_VERBOSE;
1083 const int mainline = add_flags & SYMFILE_MAINLINE;
1084 const int should_print = ((from_tty || info_verbose)
1085 && (readnow_symbol_files
1086 || (add_flags & SYMFILE_NO_READ) == 0));
1088 if (readnow_symbol_files)
1090 flags |= OBJF_READNOW;
1091 add_flags &= ~SYMFILE_NO_READ;
1094 my_cleanups = make_cleanup_bfd_close (abfd);
1096 /* Give user a chance to burp if we'd be
1097 interactively wiping out any existing symbols. */
1099 if ((have_full_symbols () || have_partial_symbols ())
1102 && !query (_("Load new symbol table from \"%s\"? "), name))
1103 error (_("Not confirmed."));
1105 objfile = allocate_objfile (abfd, flags | (mainline ? OBJF_MAINLINE : 0));
1106 discard_cleanups (my_cleanups);
1109 add_separate_debug_objfile (objfile, parent);
1111 /* We either created a new mapped symbol table, mapped an existing
1112 symbol table file which has not had initial symbol reading
1113 performed, or need to read an unmapped symbol table. */
1116 if (deprecated_pre_add_symbol_hook)
1117 deprecated_pre_add_symbol_hook (name);
1120 printf_unfiltered (_("Reading symbols from %s..."), name);
1122 gdb_flush (gdb_stdout);
1125 syms_from_objfile (objfile, addrs, offsets, num_offsets,
1128 /* We now have at least a partial symbol table. Check to see if the
1129 user requested that all symbols be read on initial access via either
1130 the gdb startup command line or on a per symbol file basis. Expand
1131 all partial symbol tables for this objfile if so. */
1133 if ((flags & OBJF_READNOW))
1137 printf_unfiltered (_("expanding to full symbols..."));
1139 gdb_flush (gdb_stdout);
1143 objfile->sf->qf->expand_all_symtabs (objfile);
1146 if (should_print && !objfile_has_symbols (objfile))
1149 printf_unfiltered (_("(no debugging symbols found)..."));
1155 if (deprecated_post_add_symbol_hook)
1156 deprecated_post_add_symbol_hook ();
1158 printf_unfiltered (_("done.\n"));
1161 /* We print some messages regardless of whether 'from_tty ||
1162 info_verbose' is true, so make sure they go out at the right
1164 gdb_flush (gdb_stdout);
1166 if (objfile->sf == NULL)
1168 observer_notify_new_objfile (objfile);
1169 return objfile; /* No symbols. */
1172 new_symfile_objfile (objfile, add_flags);
1174 observer_notify_new_objfile (objfile);
1176 bfd_cache_close_all ();
1180 /* Add BFD as a separate debug file for OBJFILE. */
1183 symbol_file_add_separate (bfd *bfd, int symfile_flags, struct objfile *objfile)
1185 struct objfile *new_objfile;
1186 struct section_addr_info *sap;
1187 struct cleanup *my_cleanup;
1189 /* Create section_addr_info. We can't directly use offsets from OBJFILE
1190 because sections of BFD may not match sections of OBJFILE and because
1191 vma may have been modified by tools such as prelink. */
1192 sap = build_section_addr_info_from_objfile (objfile);
1193 my_cleanup = make_cleanup_free_section_addr_info (sap);
1195 new_objfile = symbol_file_add_with_addrs_or_offsets
1196 (bfd, symfile_flags,
1198 objfile->flags & (OBJF_REORDERED | OBJF_SHARED | OBJF_READNOW
1202 do_cleanups (my_cleanup);
1205 /* Process the symbol file ABFD, as either the main file or as a
1206 dynamically loaded file.
1208 See symbol_file_add_with_addrs_or_offsets's comments for
1211 symbol_file_add_from_bfd (bfd *abfd, int add_flags,
1212 struct section_addr_info *addrs,
1213 int flags, struct objfile *parent)
1215 return symbol_file_add_with_addrs_or_offsets (abfd, add_flags, addrs, 0, 0,
1220 /* Process a symbol file, as either the main file or as a dynamically
1221 loaded file. See symbol_file_add_with_addrs_or_offsets's comments
1224 symbol_file_add (char *name, int add_flags, struct section_addr_info *addrs,
1227 return symbol_file_add_from_bfd (symfile_bfd_open (name), add_flags, addrs,
1232 /* Call symbol_file_add() with default values and update whatever is
1233 affected by the loading of a new main().
1234 Used when the file is supplied in the gdb command line
1235 and by some targets with special loading requirements.
1236 The auxiliary function, symbol_file_add_main_1(), has the flags
1237 argument for the switches that can only be specified in the symbol_file
1241 symbol_file_add_main (char *args, int from_tty)
1243 symbol_file_add_main_1 (args, from_tty, 0);
1247 symbol_file_add_main_1 (char *args, int from_tty, int flags)
1249 const int add_flags = SYMFILE_MAINLINE | (from_tty ? SYMFILE_VERBOSE : 0);
1250 symbol_file_add (args, add_flags, NULL, flags);
1252 /* Getting new symbols may change our opinion about
1253 what is frameless. */
1254 reinit_frame_cache ();
1256 set_initial_language ();
1260 symbol_file_clear (int from_tty)
1262 if ((have_full_symbols () || have_partial_symbols ())
1265 ? !query (_("Discard symbol table from `%s'? "),
1266 symfile_objfile->name)
1267 : !query (_("Discard symbol table? "))))
1268 error (_("Not confirmed."));
1270 /* solib descriptors may have handles to objfiles. Wipe them before their
1271 objfiles get stale by free_all_objfiles. */
1272 no_shared_libraries (NULL, from_tty);
1274 free_all_objfiles ();
1276 gdb_assert (symfile_objfile == NULL);
1278 printf_unfiltered (_("No symbol file now.\n"));
1282 get_debug_link_info (struct objfile *objfile, unsigned long *crc32_out)
1285 bfd_size_type debuglink_size;
1286 unsigned long crc32;
1290 sect = bfd_get_section_by_name (objfile->obfd, ".gnu_debuglink");
1295 debuglink_size = bfd_section_size (objfile->obfd, sect);
1297 contents = xmalloc (debuglink_size);
1298 bfd_get_section_contents (objfile->obfd, sect, contents,
1299 (file_ptr)0, (bfd_size_type)debuglink_size);
1301 /* Crc value is stored after the filename, aligned up to 4 bytes. */
1302 crc_offset = strlen (contents) + 1;
1303 crc_offset = (crc_offset + 3) & ~3;
1305 crc32 = bfd_get_32 (objfile->obfd, (bfd_byte *) (contents + crc_offset));
1311 /* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and
1312 return 1. Otherwise print a warning and return 0. ABFD seek position is
1316 get_file_crc (bfd *abfd, unsigned long *file_crc_return)
1318 unsigned long file_crc = 0;
1320 if (bfd_seek (abfd, 0, SEEK_SET) != 0)
1322 warning (_("Problem reading \"%s\" for CRC: %s"),
1323 bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
1329 gdb_byte buffer[8 * 1024];
1330 bfd_size_type count;
1332 count = bfd_bread (buffer, sizeof (buffer), abfd);
1333 if (count == (bfd_size_type) -1)
1335 warning (_("Problem reading \"%s\" for CRC: %s"),
1336 bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
1341 file_crc = gnu_debuglink_crc32 (file_crc, buffer, count);
1344 *file_crc_return = file_crc;
1349 separate_debug_file_exists (const char *name, unsigned long crc,
1350 struct objfile *parent_objfile)
1352 unsigned long file_crc;
1355 struct stat parent_stat, abfd_stat;
1356 int verified_as_different;
1358 /* Find a separate debug info file as if symbols would be present in
1359 PARENT_OBJFILE itself this function would not be called. .gnu_debuglink
1360 section can contain just the basename of PARENT_OBJFILE without any
1361 ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where
1362 the separate debug infos with the same basename can exist. */
1364 if (filename_cmp (name, parent_objfile->name) == 0)
1367 abfd = bfd_open_maybe_remote (name);
1372 /* Verify symlinks were not the cause of filename_cmp name difference above.
1374 Some operating systems, e.g. Windows, do not provide a meaningful
1375 st_ino; they always set it to zero. (Windows does provide a
1376 meaningful st_dev.) Do not indicate a duplicate library in that
1377 case. While there is no guarantee that a system that provides
1378 meaningful inode numbers will never set st_ino to zero, this is
1379 merely an optimization, so we do not need to worry about false
1382 if (bfd_stat (abfd, &abfd_stat) == 0
1383 && abfd_stat.st_ino != 0
1384 && bfd_stat (parent_objfile->obfd, &parent_stat) == 0)
1386 if (abfd_stat.st_dev == parent_stat.st_dev
1387 && abfd_stat.st_ino == parent_stat.st_ino)
1392 verified_as_different = 1;
1395 verified_as_different = 0;
1397 file_crc_p = get_file_crc (abfd, &file_crc);
1404 if (crc != file_crc)
1406 /* If one (or both) the files are accessed for example the via "remote:"
1407 gdbserver way it does not support the bfd_stat operation. Verify
1408 whether those two files are not the same manually. */
1410 if (!verified_as_different && !parent_objfile->crc32_p)
1412 parent_objfile->crc32_p = get_file_crc (parent_objfile->obfd,
1413 &parent_objfile->crc32);
1414 if (!parent_objfile->crc32_p)
1418 if (verified_as_different || parent_objfile->crc32 != file_crc)
1419 warning (_("the debug information found in \"%s\""
1420 " does not match \"%s\" (CRC mismatch).\n"),
1421 name, parent_objfile->name);
1429 char *debug_file_directory = NULL;
1431 show_debug_file_directory (struct ui_file *file, int from_tty,
1432 struct cmd_list_element *c, const char *value)
1434 fprintf_filtered (file,
1435 _("The directory where separate debug "
1436 "symbols are searched for is \"%s\".\n"),
1440 #if ! defined (DEBUG_SUBDIRECTORY)
1441 #define DEBUG_SUBDIRECTORY ".debug"
1445 find_separate_debug_file_by_debuglink (struct objfile *objfile)
1447 char *basename, *debugdir;
1449 char *debugfile = NULL;
1450 char *canon_name = NULL;
1451 unsigned long crc32;
1454 basename = get_debug_link_info (objfile, &crc32);
1456 if (basename == NULL)
1457 /* There's no separate debug info, hence there's no way we could
1458 load it => no warning. */
1459 goto cleanup_return_debugfile;
1461 dir = xstrdup (objfile->name);
1463 /* Strip off the final filename part, leaving the directory name,
1464 followed by a slash. The directory can be relative or absolute. */
1465 for (i = strlen(dir) - 1; i >= 0; i--)
1467 if (IS_DIR_SEPARATOR (dir[i]))
1470 /* If I is -1 then no directory is present there and DIR will be "". */
1473 /* Set I to max (strlen (canon_name), strlen (dir)). */
1474 canon_name = lrealpath (dir);
1476 if (canon_name && strlen (canon_name) > i)
1477 i = strlen (canon_name);
1479 debugfile = xmalloc (strlen (debug_file_directory) + 1
1481 + strlen (DEBUG_SUBDIRECTORY)
1486 /* First try in the same directory as the original file. */
1487 strcpy (debugfile, dir);
1488 strcat (debugfile, basename);
1490 if (separate_debug_file_exists (debugfile, crc32, objfile))
1491 goto cleanup_return_debugfile;
1493 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */
1494 strcpy (debugfile, dir);
1495 strcat (debugfile, DEBUG_SUBDIRECTORY);
1496 strcat (debugfile, "/");
1497 strcat (debugfile, basename);
1499 if (separate_debug_file_exists (debugfile, crc32, objfile))
1500 goto cleanup_return_debugfile;
1502 /* Then try in the global debugfile directories.
1504 Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
1505 cause "/..." lookups. */
1507 debugdir = debug_file_directory;
1512 while (*debugdir == DIRNAME_SEPARATOR)
1515 debugdir_end = strchr (debugdir, DIRNAME_SEPARATOR);
1516 if (debugdir_end == NULL)
1517 debugdir_end = &debugdir[strlen (debugdir)];
1519 memcpy (debugfile, debugdir, debugdir_end - debugdir);
1520 debugfile[debugdir_end - debugdir] = 0;
1521 strcat (debugfile, "/");
1522 strcat (debugfile, dir);
1523 strcat (debugfile, basename);
1525 if (separate_debug_file_exists (debugfile, crc32, objfile))
1526 goto cleanup_return_debugfile;
1528 /* If the file is in the sysroot, try using its base path in the
1529 global debugfile directory. */
1531 && filename_ncmp (canon_name, gdb_sysroot,
1532 strlen (gdb_sysroot)) == 0
1533 && IS_DIR_SEPARATOR (canon_name[strlen (gdb_sysroot)]))
1535 memcpy (debugfile, debugdir, debugdir_end - debugdir);
1536 debugfile[debugdir_end - debugdir] = 0;
1537 strcat (debugfile, canon_name + strlen (gdb_sysroot));
1538 strcat (debugfile, "/");
1539 strcat (debugfile, basename);
1541 if (separate_debug_file_exists (debugfile, crc32, objfile))
1542 goto cleanup_return_debugfile;
1545 debugdir = debugdir_end;
1547 while (*debugdir != 0);
1552 cleanup_return_debugfile:
1560 /* This is the symbol-file command. Read the file, analyze its
1561 symbols, and add a struct symtab to a symtab list. The syntax of
1562 the command is rather bizarre:
1564 1. The function buildargv implements various quoting conventions
1565 which are undocumented and have little or nothing in common with
1566 the way things are quoted (or not quoted) elsewhere in GDB.
1568 2. Options are used, which are not generally used in GDB (perhaps
1569 "set mapped on", "set readnow on" would be better)
1571 3. The order of options matters, which is contrary to GNU
1572 conventions (because it is confusing and inconvenient). */
1575 symbol_file_command (char *args, int from_tty)
1581 symbol_file_clear (from_tty);
1585 char **argv = gdb_buildargv (args);
1586 int flags = OBJF_USERLOADED;
1587 struct cleanup *cleanups;
1590 cleanups = make_cleanup_freeargv (argv);
1591 while (*argv != NULL)
1593 if (strcmp (*argv, "-readnow") == 0)
1594 flags |= OBJF_READNOW;
1595 else if (**argv == '-')
1596 error (_("unknown option `%s'"), *argv);
1599 symbol_file_add_main_1 (*argv, from_tty, flags);
1607 error (_("no symbol file name was specified"));
1609 do_cleanups (cleanups);
1613 /* Set the initial language.
1615 FIXME: A better solution would be to record the language in the
1616 psymtab when reading partial symbols, and then use it (if known) to
1617 set the language. This would be a win for formats that encode the
1618 language in an easily discoverable place, such as DWARF. For
1619 stabs, we can jump through hoops looking for specially named
1620 symbols or try to intuit the language from the specific type of
1621 stabs we find, but we can't do that until later when we read in
1625 set_initial_language (void)
1627 enum language lang = language_unknown;
1629 if (language_of_main != language_unknown)
1630 lang = language_of_main;
1633 const char *filename;
1635 filename = find_main_filename ();
1636 if (filename != NULL)
1637 lang = deduce_language_from_filename (filename);
1640 if (lang == language_unknown)
1642 /* Make C the default language */
1646 set_language (lang);
1647 expected_language = current_language; /* Don't warn the user. */
1650 /* If NAME is a remote name open the file using remote protocol, otherwise
1651 open it normally. */
1654 bfd_open_maybe_remote (const char *name)
1656 if (remote_filename_p (name))
1657 return remote_bfd_open (name, gnutarget);
1659 return bfd_openr (name, gnutarget);
1663 /* Open the file specified by NAME and hand it off to BFD for
1664 preliminary analysis. Return a newly initialized bfd *, which
1665 includes a newly malloc'd` copy of NAME (tilde-expanded and made
1666 absolute). In case of trouble, error() is called. */
1669 symfile_bfd_open (char *name)
1673 char *absolute_name;
1675 if (remote_filename_p (name))
1677 name = xstrdup (name);
1678 sym_bfd = remote_bfd_open (name, gnutarget);
1681 make_cleanup (xfree, name);
1682 error (_("`%s': can't open to read symbols: %s."), name,
1683 bfd_errmsg (bfd_get_error ()));
1686 if (!bfd_check_format (sym_bfd, bfd_object))
1688 bfd_close (sym_bfd);
1689 make_cleanup (xfree, name);
1690 error (_("`%s': can't read symbols: %s."), name,
1691 bfd_errmsg (bfd_get_error ()));
1697 name = tilde_expand (name); /* Returns 1st new malloc'd copy. */
1699 /* Look down path for it, allocate 2nd new malloc'd copy. */
1700 desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, name,
1701 O_RDONLY | O_BINARY, &absolute_name);
1702 #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__)
1705 char *exename = alloca (strlen (name) + 5);
1707 strcat (strcpy (exename, name), ".exe");
1708 desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename,
1709 O_RDONLY | O_BINARY, &absolute_name);
1714 make_cleanup (xfree, name);
1715 perror_with_name (name);
1718 /* Free 1st new malloc'd copy, but keep the 2nd malloc'd copy in
1719 bfd. It'll be freed in free_objfile(). */
1721 name = absolute_name;
1723 sym_bfd = bfd_fopen (name, gnutarget, FOPEN_RB, desc);
1727 make_cleanup (xfree, name);
1728 error (_("`%s': can't open to read symbols: %s."), name,
1729 bfd_errmsg (bfd_get_error ()));
1731 bfd_set_cacheable (sym_bfd, 1);
1733 if (!bfd_check_format (sym_bfd, bfd_object))
1735 /* FIXME: should be checking for errors from bfd_close (for one
1736 thing, on error it does not free all the storage associated
1738 bfd_close (sym_bfd); /* This also closes desc. */
1739 make_cleanup (xfree, name);
1740 error (_("`%s': can't read symbols: %s."), name,
1741 bfd_errmsg (bfd_get_error ()));
1744 /* bfd_usrdata exists for applications and libbfd must not touch it. */
1745 gdb_assert (bfd_usrdata (sym_bfd) == NULL);
1750 /* Return the section index for SECTION_NAME on OBJFILE. Return -1 if
1751 the section was not found. */
1754 get_section_index (struct objfile *objfile, char *section_name)
1756 asection *sect = bfd_get_section_by_name (objfile->obfd, section_name);
1764 /* Link SF into the global symtab_fns list. Called on startup by the
1765 _initialize routine in each object file format reader, to register
1766 information about each format the reader is prepared to handle. */
1769 add_symtab_fns (const struct sym_fns *sf)
1771 VEC_safe_push (sym_fns_ptr, symtab_fns, sf);
1774 /* Initialize OBJFILE to read symbols from its associated BFD. It
1775 either returns or calls error(). The result is an initialized
1776 struct sym_fns in the objfile structure, that contains cached
1777 information about the symbol file. */
1779 static const struct sym_fns *
1780 find_sym_fns (bfd *abfd)
1782 const struct sym_fns *sf;
1783 enum bfd_flavour our_flavour = bfd_get_flavour (abfd);
1786 if (our_flavour == bfd_target_srec_flavour
1787 || our_flavour == bfd_target_ihex_flavour
1788 || our_flavour == bfd_target_tekhex_flavour)
1789 return NULL; /* No symbols. */
1791 for (i = 0; VEC_iterate (sym_fns_ptr, symtab_fns, i, sf); ++i)
1792 if (our_flavour == sf->sym_flavour)
1795 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."),
1796 bfd_get_target (abfd));
1800 /* This function runs the load command of our current target. */
1803 load_command (char *arg, int from_tty)
1807 /* The user might be reloading because the binary has changed. Take
1808 this opportunity to check. */
1809 reopen_exec_file ();
1817 parg = arg = get_exec_file (1);
1819 /* Count how many \ " ' tab space there are in the name. */
1820 while ((parg = strpbrk (parg, "\\\"'\t ")))
1828 /* We need to quote this string so buildargv can pull it apart. */
1829 char *temp = xmalloc (strlen (arg) + count + 1 );
1833 make_cleanup (xfree, temp);
1836 while ((parg = strpbrk (parg, "\\\"'\t ")))
1838 strncpy (ptemp, prev, parg - prev);
1839 ptemp += parg - prev;
1843 strcpy (ptemp, prev);
1849 target_load (arg, from_tty);
1851 /* After re-loading the executable, we don't really know which
1852 overlays are mapped any more. */
1853 overlay_cache_invalid = 1;
1856 /* This version of "load" should be usable for any target. Currently
1857 it is just used for remote targets, not inftarg.c or core files,
1858 on the theory that only in that case is it useful.
1860 Avoiding xmodem and the like seems like a win (a) because we don't have
1861 to worry about finding it, and (b) On VMS, fork() is very slow and so
1862 we don't want to run a subprocess. On the other hand, I'm not sure how
1863 performance compares. */
1865 static int validate_download = 0;
1867 /* Callback service function for generic_load (bfd_map_over_sections). */
1870 add_section_size_callback (bfd *abfd, asection *asec, void *data)
1872 bfd_size_type *sum = data;
1874 *sum += bfd_get_section_size (asec);
1877 /* Opaque data for load_section_callback. */
1878 struct load_section_data {
1879 unsigned long load_offset;
1880 struct load_progress_data *progress_data;
1881 VEC(memory_write_request_s) *requests;
1884 /* Opaque data for load_progress. */
1885 struct load_progress_data {
1886 /* Cumulative data. */
1887 unsigned long write_count;
1888 unsigned long data_count;
1889 bfd_size_type total_size;
1892 /* Opaque data for load_progress for a single section. */
1893 struct load_progress_section_data {
1894 struct load_progress_data *cumulative;
1896 /* Per-section data. */
1897 const char *section_name;
1898 ULONGEST section_sent;
1899 ULONGEST section_size;
1904 /* Target write callback routine for progress reporting. */
1907 load_progress (ULONGEST bytes, void *untyped_arg)
1909 struct load_progress_section_data *args = untyped_arg;
1910 struct load_progress_data *totals;
1913 /* Writing padding data. No easy way to get at the cumulative
1914 stats, so just ignore this. */
1917 totals = args->cumulative;
1919 if (bytes == 0 && args->section_sent == 0)
1921 /* The write is just starting. Let the user know we've started
1923 ui_out_message (current_uiout, 0, "Loading section %s, size %s lma %s\n",
1924 args->section_name, hex_string (args->section_size),
1925 paddress (target_gdbarch, args->lma));
1929 if (validate_download)
1931 /* Broken memories and broken monitors manifest themselves here
1932 when bring new computers to life. This doubles already slow
1934 /* NOTE: cagney/1999-10-18: A more efficient implementation
1935 might add a verify_memory() method to the target vector and
1936 then use that. remote.c could implement that method using
1937 the ``qCRC'' packet. */
1938 gdb_byte *check = xmalloc (bytes);
1939 struct cleanup *verify_cleanups = make_cleanup (xfree, check);
1941 if (target_read_memory (args->lma, check, bytes) != 0)
1942 error (_("Download verify read failed at %s"),
1943 paddress (target_gdbarch, args->lma));
1944 if (memcmp (args->buffer, check, bytes) != 0)
1945 error (_("Download verify compare failed at %s"),
1946 paddress (target_gdbarch, args->lma));
1947 do_cleanups (verify_cleanups);
1949 totals->data_count += bytes;
1951 args->buffer += bytes;
1952 totals->write_count += 1;
1953 args->section_sent += bytes;
1955 || (deprecated_ui_load_progress_hook != NULL
1956 && deprecated_ui_load_progress_hook (args->section_name,
1957 args->section_sent)))
1958 error (_("Canceled the download"));
1960 if (deprecated_show_load_progress != NULL)
1961 deprecated_show_load_progress (args->section_name,
1965 totals->total_size);
1968 /* Callback service function for generic_load (bfd_map_over_sections). */
1971 load_section_callback (bfd *abfd, asection *asec, void *data)
1973 struct memory_write_request *new_request;
1974 struct load_section_data *args = data;
1975 struct load_progress_section_data *section_data;
1976 bfd_size_type size = bfd_get_section_size (asec);
1978 const char *sect_name = bfd_get_section_name (abfd, asec);
1980 if ((bfd_get_section_flags (abfd, asec) & SEC_LOAD) == 0)
1986 new_request = VEC_safe_push (memory_write_request_s,
1987 args->requests, NULL);
1988 memset (new_request, 0, sizeof (struct memory_write_request));
1989 section_data = xcalloc (1, sizeof (struct load_progress_section_data));
1990 new_request->begin = bfd_section_lma (abfd, asec) + args->load_offset;
1991 new_request->end = new_request->begin + size; /* FIXME Should size
1993 new_request->data = xmalloc (size);
1994 new_request->baton = section_data;
1996 buffer = new_request->data;
1998 section_data->cumulative = args->progress_data;
1999 section_data->section_name = sect_name;
2000 section_data->section_size = size;
2001 section_data->lma = new_request->begin;
2002 section_data->buffer = buffer;
2004 bfd_get_section_contents (abfd, asec, buffer, 0, size);
2007 /* Clean up an entire memory request vector, including load
2008 data and progress records. */
2011 clear_memory_write_data (void *arg)
2013 VEC(memory_write_request_s) **vec_p = arg;
2014 VEC(memory_write_request_s) *vec = *vec_p;
2016 struct memory_write_request *mr;
2018 for (i = 0; VEC_iterate (memory_write_request_s, vec, i, mr); ++i)
2023 VEC_free (memory_write_request_s, vec);
2027 generic_load (char *args, int from_tty)
2030 struct timeval start_time, end_time;
2032 struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0);
2033 struct load_section_data cbdata;
2034 struct load_progress_data total_progress;
2035 struct ui_out *uiout = current_uiout;
2040 memset (&cbdata, 0, sizeof (cbdata));
2041 memset (&total_progress, 0, sizeof (total_progress));
2042 cbdata.progress_data = &total_progress;
2044 make_cleanup (clear_memory_write_data, &cbdata.requests);
2047 error_no_arg (_("file to load"));
2049 argv = gdb_buildargv (args);
2050 make_cleanup_freeargv (argv);
2052 filename = tilde_expand (argv[0]);
2053 make_cleanup (xfree, filename);
2055 if (argv[1] != NULL)
2059 cbdata.load_offset = strtoul (argv[1], &endptr, 0);
2061 /* If the last word was not a valid number then
2062 treat it as a file name with spaces in. */
2063 if (argv[1] == endptr)
2064 error (_("Invalid download offset:%s."), argv[1]);
2066 if (argv[2] != NULL)
2067 error (_("Too many parameters."));
2070 /* Open the file for loading. */
2071 loadfile_bfd = bfd_openr (filename, gnutarget);
2072 if (loadfile_bfd == NULL)
2074 perror_with_name (filename);
2078 /* FIXME: should be checking for errors from bfd_close (for one thing,
2079 on error it does not free all the storage associated with the
2081 make_cleanup_bfd_close (loadfile_bfd);
2083 if (!bfd_check_format (loadfile_bfd, bfd_object))
2085 error (_("\"%s\" is not an object file: %s"), filename,
2086 bfd_errmsg (bfd_get_error ()));
2089 bfd_map_over_sections (loadfile_bfd, add_section_size_callback,
2090 (void *) &total_progress.total_size);
2092 bfd_map_over_sections (loadfile_bfd, load_section_callback, &cbdata);
2094 gettimeofday (&start_time, NULL);
2096 if (target_write_memory_blocks (cbdata.requests, flash_discard,
2097 load_progress) != 0)
2098 error (_("Load failed"));
2100 gettimeofday (&end_time, NULL);
2102 entry = bfd_get_start_address (loadfile_bfd);
2103 ui_out_text (uiout, "Start address ");
2104 ui_out_field_fmt (uiout, "address", "%s", paddress (target_gdbarch, entry));
2105 ui_out_text (uiout, ", load size ");
2106 ui_out_field_fmt (uiout, "load-size", "%lu", total_progress.data_count);
2107 ui_out_text (uiout, "\n");
2108 /* We were doing this in remote-mips.c, I suspect it is right
2109 for other targets too. */
2110 regcache_write_pc (get_current_regcache (), entry);
2112 /* Reset breakpoints, now that we have changed the load image. For
2113 instance, breakpoints may have been set (or reset, by
2114 post_create_inferior) while connected to the target but before we
2115 loaded the program. In that case, the prologue analyzer could
2116 have read instructions from the target to find the right
2117 breakpoint locations. Loading has changed the contents of that
2120 breakpoint_re_set ();
2122 /* FIXME: are we supposed to call symbol_file_add or not? According
2123 to a comment from remote-mips.c (where a call to symbol_file_add
2124 was commented out), making the call confuses GDB if more than one
2125 file is loaded in. Some targets do (e.g., remote-vx.c) but
2126 others don't (or didn't - perhaps they have all been deleted). */
2128 print_transfer_performance (gdb_stdout, total_progress.data_count,
2129 total_progress.write_count,
2130 &start_time, &end_time);
2132 do_cleanups (old_cleanups);
2135 /* Report how fast the transfer went. */
2137 /* DEPRECATED: cagney/1999-10-18: report_transfer_performance is being
2138 replaced by print_transfer_performance (with a very different
2139 function signature). */
2142 report_transfer_performance (unsigned long data_count, time_t start_time,
2145 struct timeval start, end;
2147 start.tv_sec = start_time;
2149 end.tv_sec = end_time;
2152 print_transfer_performance (gdb_stdout, data_count, 0, &start, &end);
2156 print_transfer_performance (struct ui_file *stream,
2157 unsigned long data_count,
2158 unsigned long write_count,
2159 const struct timeval *start_time,
2160 const struct timeval *end_time)
2162 ULONGEST time_count;
2163 struct ui_out *uiout = current_uiout;
2165 /* Compute the elapsed time in milliseconds, as a tradeoff between
2166 accuracy and overflow. */
2167 time_count = (end_time->tv_sec - start_time->tv_sec) * 1000;
2168 time_count += (end_time->tv_usec - start_time->tv_usec) / 1000;
2170 ui_out_text (uiout, "Transfer rate: ");
2173 unsigned long rate = ((ULONGEST) data_count * 1000) / time_count;
2175 if (ui_out_is_mi_like_p (uiout))
2177 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate * 8);
2178 ui_out_text (uiout, " bits/sec");
2180 else if (rate < 1024)
2182 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate);
2183 ui_out_text (uiout, " bytes/sec");
2187 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate / 1024);
2188 ui_out_text (uiout, " KB/sec");
2193 ui_out_field_fmt (uiout, "transferred-bits", "%lu", (data_count * 8));
2194 ui_out_text (uiout, " bits in <1 sec");
2196 if (write_count > 0)
2198 ui_out_text (uiout, ", ");
2199 ui_out_field_fmt (uiout, "write-rate", "%lu", data_count / write_count);
2200 ui_out_text (uiout, " bytes/write");
2202 ui_out_text (uiout, ".\n");
2205 /* This function allows the addition of incrementally linked object files.
2206 It does not modify any state in the target, only in the debugger. */
2207 /* Note: ezannoni 2000-04-13 This function/command used to have a
2208 special case syntax for the rombug target (Rombug is the boot
2209 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the
2210 rombug case, the user doesn't need to supply a text address,
2211 instead a call to target_link() (in target.c) would supply the
2212 value to use. We are now discontinuing this type of ad hoc syntax. */
2215 add_symbol_file_command (char *args, int from_tty)
2217 struct gdbarch *gdbarch = get_current_arch ();
2218 char *filename = NULL;
2219 int flags = OBJF_USERLOADED;
2221 int section_index = 0;
2225 int expecting_sec_name = 0;
2226 int expecting_sec_addr = 0;
2235 struct section_addr_info *section_addrs;
2236 struct sect_opt *sect_opts = NULL;
2237 size_t num_sect_opts = 0;
2238 struct cleanup *my_cleanups = make_cleanup (null_cleanup, NULL);
2241 sect_opts = (struct sect_opt *) xmalloc (num_sect_opts
2242 * sizeof (struct sect_opt));
2247 error (_("add-symbol-file takes a file name and an address"));
2249 argv = gdb_buildargv (args);
2250 make_cleanup_freeargv (argv);
2252 for (arg = argv[0], argcnt = 0; arg != NULL; arg = argv[++argcnt])
2254 /* Process the argument. */
2257 /* The first argument is the file name. */
2258 filename = tilde_expand (arg);
2259 make_cleanup (xfree, filename);
2264 /* The second argument is always the text address at which
2265 to load the program. */
2266 sect_opts[section_index].name = ".text";
2267 sect_opts[section_index].value = arg;
2268 if (++section_index >= num_sect_opts)
2271 sect_opts = ((struct sect_opt *)
2272 xrealloc (sect_opts,
2274 * sizeof (struct sect_opt)));
2279 /* It's an option (starting with '-') or it's an argument
2284 if (strcmp (arg, "-readnow") == 0)
2285 flags |= OBJF_READNOW;
2286 else if (strcmp (arg, "-s") == 0)
2288 expecting_sec_name = 1;
2289 expecting_sec_addr = 1;
2294 if (expecting_sec_name)
2296 sect_opts[section_index].name = arg;
2297 expecting_sec_name = 0;
2300 if (expecting_sec_addr)
2302 sect_opts[section_index].value = arg;
2303 expecting_sec_addr = 0;
2304 if (++section_index >= num_sect_opts)
2307 sect_opts = ((struct sect_opt *)
2308 xrealloc (sect_opts,
2310 * sizeof (struct sect_opt)));
2314 error (_("USAGE: add-symbol-file <filename> <textaddress>"
2315 " [-readnow] [-s <secname> <addr>]*"));
2320 /* This command takes at least two arguments. The first one is a
2321 filename, and the second is the address where this file has been
2322 loaded. Abort now if this address hasn't been provided by the
2324 if (section_index < 1)
2325 error (_("The address where %s has been loaded is missing"), filename);
2327 /* Print the prompt for the query below. And save the arguments into
2328 a sect_addr_info structure to be passed around to other
2329 functions. We have to split this up into separate print
2330 statements because hex_string returns a local static
2333 printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename);
2334 section_addrs = alloc_section_addr_info (section_index);
2335 make_cleanup (xfree, section_addrs);
2336 for (i = 0; i < section_index; i++)
2339 char *val = sect_opts[i].value;
2340 char *sec = sect_opts[i].name;
2342 addr = parse_and_eval_address (val);
2344 /* Here we store the section offsets in the order they were
2345 entered on the command line. */
2346 section_addrs->other[sec_num].name = sec;
2347 section_addrs->other[sec_num].addr = addr;
2348 printf_unfiltered ("\t%s_addr = %s\n", sec,
2349 paddress (gdbarch, addr));
2352 /* The object's sections are initialized when a
2353 call is made to build_objfile_section_table (objfile).
2354 This happens in reread_symbols.
2355 At this point, we don't know what file type this is,
2356 so we can't determine what section names are valid. */
2359 if (from_tty && (!query ("%s", "")))
2360 error (_("Not confirmed."));
2362 symbol_file_add (filename, from_tty ? SYMFILE_VERBOSE : 0,
2363 section_addrs, flags);
2365 /* Getting new symbols may change our opinion about what is
2367 reinit_frame_cache ();
2368 do_cleanups (my_cleanups);
2372 /* Re-read symbols if a symbol-file has changed. */
2374 reread_symbols (void)
2376 struct objfile *objfile;
2379 struct stat new_statbuf;
2382 /* With the addition of shared libraries, this should be modified,
2383 the load time should be saved in the partial symbol tables, since
2384 different tables may come from different source files. FIXME.
2385 This routine should then walk down each partial symbol table
2386 and see if the symbol table that it originates from has been changed. */
2388 for (objfile = object_files; objfile; objfile = objfile->next)
2390 /* solib-sunos.c creates one objfile with obfd. */
2391 if (objfile->obfd == NULL)
2394 /* Separate debug objfiles are handled in the main objfile. */
2395 if (objfile->separate_debug_objfile_backlink)
2398 /* If this object is from an archive (what you usually create with
2399 `ar', often called a `static library' on most systems, though
2400 a `shared library' on AIX is also an archive), then you should
2401 stat on the archive name, not member name. */
2402 if (objfile->obfd->my_archive)
2403 res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
2405 res = stat (objfile->name, &new_statbuf);
2408 /* FIXME, should use print_sys_errmsg but it's not filtered. */
2409 printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"),
2413 new_modtime = new_statbuf.st_mtime;
2414 if (new_modtime != objfile->mtime)
2416 struct cleanup *old_cleanups;
2417 struct section_offsets *offsets;
2419 char *obfd_filename;
2421 printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"),
2424 /* There are various functions like symbol_file_add,
2425 symfile_bfd_open, syms_from_objfile, etc., which might
2426 appear to do what we want. But they have various other
2427 effects which we *don't* want. So we just do stuff
2428 ourselves. We don't worry about mapped files (for one thing,
2429 any mapped file will be out of date). */
2431 /* If we get an error, blow away this objfile (not sure if
2432 that is the correct response for things like shared
2434 old_cleanups = make_cleanup_free_objfile (objfile);
2435 /* We need to do this whenever any symbols go away. */
2436 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);
2438 if (exec_bfd != NULL
2439 && filename_cmp (bfd_get_filename (objfile->obfd),
2440 bfd_get_filename (exec_bfd)) == 0)
2442 /* Reload EXEC_BFD without asking anything. */
2444 exec_file_attach (bfd_get_filename (objfile->obfd), 0);
2447 /* Keep the calls order approx. the same as in free_objfile. */
2449 /* Free the separate debug objfiles. It will be
2450 automatically recreated by sym_read. */
2451 free_objfile_separate_debug (objfile);
2453 /* Remove any references to this objfile in the global
2455 preserve_values (objfile);
2457 /* Nuke all the state that we will re-read. Much of the following
2458 code which sets things to NULL really is necessary to tell
2459 other parts of GDB that there is nothing currently there.
2461 Try to keep the freeing order compatible with free_objfile. */
2463 if (objfile->sf != NULL)
2465 (*objfile->sf->sym_finish) (objfile);
2468 clear_objfile_data (objfile);
2470 /* Clean up any state BFD has sitting around. We don't need
2471 to close the descriptor but BFD lacks a way of closing the
2472 BFD without closing the descriptor. */
2473 obfd_filename = bfd_get_filename (objfile->obfd);
2474 if (!bfd_close (objfile->obfd))
2475 error (_("Can't close BFD for %s: %s"), objfile->name,
2476 bfd_errmsg (bfd_get_error ()));
2477 objfile->obfd = bfd_open_maybe_remote (obfd_filename);
2478 if (objfile->obfd == NULL)
2479 error (_("Can't open %s to read symbols."), objfile->name);
2481 objfile->obfd = gdb_bfd_ref (objfile->obfd);
2482 /* bfd_openr sets cacheable to true, which is what we want. */
2483 if (!bfd_check_format (objfile->obfd, bfd_object))
2484 error (_("Can't read symbols from %s: %s."), objfile->name,
2485 bfd_errmsg (bfd_get_error ()));
2487 /* Save the offsets, we will nuke them with the rest of the
2489 num_offsets = objfile->num_sections;
2490 offsets = ((struct section_offsets *)
2491 alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets)));
2492 memcpy (offsets, objfile->section_offsets,
2493 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2495 /* FIXME: Do we have to free a whole linked list, or is this
2497 if (objfile->global_psymbols.list)
2498 xfree (objfile->global_psymbols.list);
2499 memset (&objfile->global_psymbols, 0,
2500 sizeof (objfile->global_psymbols));
2501 if (objfile->static_psymbols.list)
2502 xfree (objfile->static_psymbols.list);
2503 memset (&objfile->static_psymbols, 0,
2504 sizeof (objfile->static_psymbols));
2506 /* Free the obstacks for non-reusable objfiles. */
2507 psymbol_bcache_free (objfile->psymbol_cache);
2508 objfile->psymbol_cache = psymbol_bcache_init ();
2509 bcache_xfree (objfile->macro_cache);
2510 objfile->macro_cache = bcache_xmalloc (NULL, NULL);
2511 bcache_xfree (objfile->filename_cache);
2512 objfile->filename_cache = bcache_xmalloc (NULL,NULL);
2513 if (objfile->demangled_names_hash != NULL)
2515 htab_delete (objfile->demangled_names_hash);
2516 objfile->demangled_names_hash = NULL;
2518 obstack_free (&objfile->objfile_obstack, 0);
2519 objfile->sections = NULL;
2520 objfile->symtabs = NULL;
2521 objfile->psymtabs = NULL;
2522 objfile->psymtabs_addrmap = NULL;
2523 objfile->free_psymtabs = NULL;
2524 objfile->template_symbols = NULL;
2525 objfile->msymbols = NULL;
2526 objfile->deprecated_sym_private = NULL;
2527 objfile->minimal_symbol_count = 0;
2528 memset (&objfile->msymbol_hash, 0,
2529 sizeof (objfile->msymbol_hash));
2530 memset (&objfile->msymbol_demangled_hash, 0,
2531 sizeof (objfile->msymbol_demangled_hash));
2533 /* obstack_init also initializes the obstack so it is
2534 empty. We could use obstack_specify_allocation but
2535 gdb_obstack.h specifies the alloc/dealloc
2537 obstack_init (&objfile->objfile_obstack);
2538 if (build_objfile_section_table (objfile))
2540 error (_("Can't find the file sections in `%s': %s"),
2541 objfile->name, bfd_errmsg (bfd_get_error ()));
2543 terminate_minimal_symbol_table (objfile);
2545 /* We use the same section offsets as from last time. I'm not
2546 sure whether that is always correct for shared libraries. */
2547 objfile->section_offsets = (struct section_offsets *)
2548 obstack_alloc (&objfile->objfile_obstack,
2549 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2550 memcpy (objfile->section_offsets, offsets,
2551 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2552 objfile->num_sections = num_offsets;
2554 /* What the hell is sym_new_init for, anyway? The concept of
2555 distinguishing between the main file and additional files
2556 in this way seems rather dubious. */
2557 if (objfile == symfile_objfile)
2559 (*objfile->sf->sym_new_init) (objfile);
2562 (*objfile->sf->sym_init) (objfile);
2563 clear_complaints (&symfile_complaints, 1, 1);
2564 /* Do not set flags as this is safe and we don't want to be
2566 (*objfile->sf->sym_read) (objfile, 0);
2567 if ((objfile->flags & OBJF_PSYMTABS_READ) != 0)
2569 objfile->flags &= ~OBJF_PSYMTABS_READ;
2570 require_partial_symbols (objfile, 0);
2573 if (!objfile_has_symbols (objfile))
2576 printf_unfiltered (_("(no debugging symbols found)\n"));
2580 /* We're done reading the symbol file; finish off complaints. */
2581 clear_complaints (&symfile_complaints, 0, 1);
2583 /* Getting new symbols may change our opinion about what is
2586 reinit_frame_cache ();
2588 /* Discard cleanups as symbol reading was successful. */
2589 discard_cleanups (old_cleanups);
2591 /* If the mtime has changed between the time we set new_modtime
2592 and now, we *want* this to be out of date, so don't call stat
2594 objfile->mtime = new_modtime;
2596 init_entry_point_info (objfile);
2602 /* Notify objfiles that we've modified objfile sections. */
2603 objfiles_changed ();
2605 clear_symtab_users (0);
2606 /* At least one objfile has changed, so we can consider that
2607 the executable we're debugging has changed too. */
2608 observer_notify_executable_changed ();
2621 static filename_language *filename_language_table;
2622 static int fl_table_size, fl_table_next;
2625 add_filename_language (char *ext, enum language lang)
2627 if (fl_table_next >= fl_table_size)
2629 fl_table_size += 10;
2630 filename_language_table =
2631 xrealloc (filename_language_table,
2632 fl_table_size * sizeof (*filename_language_table));
2635 filename_language_table[fl_table_next].ext = xstrdup (ext);
2636 filename_language_table[fl_table_next].lang = lang;
2640 static char *ext_args;
2642 show_ext_args (struct ui_file *file, int from_tty,
2643 struct cmd_list_element *c, const char *value)
2645 fprintf_filtered (file,
2646 _("Mapping between filename extension "
2647 "and source language is \"%s\".\n"),
2652 set_ext_lang_command (char *args, int from_tty, struct cmd_list_element *e)
2655 char *cp = ext_args;
2658 /* First arg is filename extension, starting with '.' */
2660 error (_("'%s': Filename extension must begin with '.'"), ext_args);
2662 /* Find end of first arg. */
2663 while (*cp && !isspace (*cp))
2667 error (_("'%s': two arguments required -- "
2668 "filename extension and language"),
2671 /* Null-terminate first arg. */
2674 /* Find beginning of second arg, which should be a source language. */
2675 while (*cp && isspace (*cp))
2679 error (_("'%s': two arguments required -- "
2680 "filename extension and language"),
2683 /* Lookup the language from among those we know. */
2684 lang = language_enum (cp);
2686 /* Now lookup the filename extension: do we already know it? */
2687 for (i = 0; i < fl_table_next; i++)
2688 if (0 == strcmp (ext_args, filename_language_table[i].ext))
2691 if (i >= fl_table_next)
2693 /* New file extension. */
2694 add_filename_language (ext_args, lang);
2698 /* Redefining a previously known filename extension. */
2701 /* query ("Really make files of type %s '%s'?", */
2702 /* ext_args, language_str (lang)); */
2704 xfree (filename_language_table[i].ext);
2705 filename_language_table[i].ext = xstrdup (ext_args);
2706 filename_language_table[i].lang = lang;
2711 info_ext_lang_command (char *args, int from_tty)
2715 printf_filtered (_("Filename extensions and the languages they represent:"));
2716 printf_filtered ("\n\n");
2717 for (i = 0; i < fl_table_next; i++)
2718 printf_filtered ("\t%s\t- %s\n",
2719 filename_language_table[i].ext,
2720 language_str (filename_language_table[i].lang));
2724 init_filename_language_table (void)
2726 if (fl_table_size == 0) /* Protect against repetition. */
2730 filename_language_table =
2731 xmalloc (fl_table_size * sizeof (*filename_language_table));
2732 add_filename_language (".c", language_c);
2733 add_filename_language (".d", language_d);
2734 add_filename_language (".C", language_cplus);
2735 add_filename_language (".cc", language_cplus);
2736 add_filename_language (".cp", language_cplus);
2737 add_filename_language (".cpp", language_cplus);
2738 add_filename_language (".cxx", language_cplus);
2739 add_filename_language (".c++", language_cplus);
2740 add_filename_language (".java", language_java);
2741 add_filename_language (".class", language_java);
2742 add_filename_language (".m", language_objc);
2743 add_filename_language (".f", language_fortran);
2744 add_filename_language (".F", language_fortran);
2745 add_filename_language (".for", language_fortran);
2746 add_filename_language (".FOR", language_fortran);
2747 add_filename_language (".ftn", language_fortran);
2748 add_filename_language (".FTN", language_fortran);
2749 add_filename_language (".fpp", language_fortran);
2750 add_filename_language (".FPP", language_fortran);
2751 add_filename_language (".f90", language_fortran);
2752 add_filename_language (".F90", language_fortran);
2753 add_filename_language (".f95", language_fortran);
2754 add_filename_language (".F95", language_fortran);
2755 add_filename_language (".f03", language_fortran);
2756 add_filename_language (".F03", language_fortran);
2757 add_filename_language (".f08", language_fortran);
2758 add_filename_language (".F08", language_fortran);
2759 add_filename_language (".s", language_asm);
2760 add_filename_language (".sx", language_asm);
2761 add_filename_language (".S", language_asm);
2762 add_filename_language (".pas", language_pascal);
2763 add_filename_language (".p", language_pascal);
2764 add_filename_language (".pp", language_pascal);
2765 add_filename_language (".adb", language_ada);
2766 add_filename_language (".ads", language_ada);
2767 add_filename_language (".a", language_ada);
2768 add_filename_language (".ada", language_ada);
2769 add_filename_language (".dg", language_ada);
2774 deduce_language_from_filename (const char *filename)
2779 if (filename != NULL)
2780 if ((cp = strrchr (filename, '.')) != NULL)
2781 for (i = 0; i < fl_table_next; i++)
2782 if (strcmp (cp, filename_language_table[i].ext) == 0)
2783 return filename_language_table[i].lang;
2785 return language_unknown;
2790 Allocate and partly initialize a new symbol table. Return a pointer
2791 to it. error() if no space.
2793 Caller must set these fields:
2802 allocate_symtab (const char *filename, struct objfile *objfile)
2804 struct symtab *symtab;
2806 symtab = (struct symtab *)
2807 obstack_alloc (&objfile->objfile_obstack, sizeof (struct symtab));
2808 memset (symtab, 0, sizeof (*symtab));
2809 symtab->filename = (char *) bcache (filename, strlen (filename) + 1,
2810 objfile->filename_cache);
2811 symtab->fullname = NULL;
2812 symtab->language = deduce_language_from_filename (filename);
2813 symtab->debugformat = "unknown";
2815 /* Hook it to the objfile it comes from. */
2817 symtab->objfile = objfile;
2818 symtab->next = objfile->symtabs;
2819 objfile->symtabs = symtab;
2825 /* Reset all data structures in gdb which may contain references to symbol
2826 table data. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
2829 clear_symtab_users (int add_flags)
2831 /* Someday, we should do better than this, by only blowing away
2832 the things that really need to be blown. */
2834 /* Clear the "current" symtab first, because it is no longer valid.
2835 breakpoint_re_set may try to access the current symtab. */
2836 clear_current_source_symtab_and_line ();
2839 if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0)
2840 breakpoint_re_set ();
2841 clear_last_displayed_sal ();
2842 clear_pc_function_cache ();
2843 observer_notify_new_objfile (NULL);
2845 /* Clear globals which might have pointed into a removed objfile.
2846 FIXME: It's not clear which of these are supposed to persist
2847 between expressions and which ought to be reset each time. */
2848 expression_context_block = NULL;
2849 innermost_block = NULL;
2851 /* Varobj may refer to old symbols, perform a cleanup. */
2852 varobj_invalidate ();
2857 clear_symtab_users_cleanup (void *ignore)
2859 clear_symtab_users (0);
2863 The following code implements an abstraction for debugging overlay sections.
2865 The target model is as follows:
2866 1) The gnu linker will permit multiple sections to be mapped into the
2867 same VMA, each with its own unique LMA (or load address).
2868 2) It is assumed that some runtime mechanism exists for mapping the
2869 sections, one by one, from the load address into the VMA address.
2870 3) This code provides a mechanism for gdb to keep track of which
2871 sections should be considered to be mapped from the VMA to the LMA.
2872 This information is used for symbol lookup, and memory read/write.
2873 For instance, if a section has been mapped then its contents
2874 should be read from the VMA, otherwise from the LMA.
2876 Two levels of debugger support for overlays are available. One is
2877 "manual", in which the debugger relies on the user to tell it which
2878 overlays are currently mapped. This level of support is
2879 implemented entirely in the core debugger, and the information about
2880 whether a section is mapped is kept in the objfile->obj_section table.
2882 The second level of support is "automatic", and is only available if
2883 the target-specific code provides functionality to read the target's
2884 overlay mapping table, and translate its contents for the debugger
2885 (by updating the mapped state information in the obj_section tables).
2887 The interface is as follows:
2889 overlay map <name> -- tell gdb to consider this section mapped
2890 overlay unmap <name> -- tell gdb to consider this section unmapped
2891 overlay list -- list the sections that GDB thinks are mapped
2892 overlay read-target -- get the target's state of what's mapped
2893 overlay off/manual/auto -- set overlay debugging state
2894 Functional interface:
2895 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2896 section, return that section.
2897 find_pc_overlay(pc): find any overlay section that contains
2898 the pc, either in its VMA or its LMA
2899 section_is_mapped(sect): true if overlay is marked as mapped
2900 section_is_overlay(sect): true if section's VMA != LMA
2901 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2902 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2903 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap
2904 overlay_mapped_address(...): map an address from section's LMA to VMA
2905 overlay_unmapped_address(...): map an address from section's VMA to LMA
2906 symbol_overlayed_address(...): Return a "current" address for symbol:
2907 either in VMA or LMA depending on whether
2908 the symbol's section is currently mapped. */
2910 /* Overlay debugging state: */
2912 enum overlay_debugging_state overlay_debugging = ovly_off;
2913 int overlay_cache_invalid = 0; /* True if need to refresh mapped state. */
2915 /* Function: section_is_overlay (SECTION)
2916 Returns true if SECTION has VMA not equal to LMA, ie.
2917 SECTION is loaded at an address different from where it will "run". */
2920 section_is_overlay (struct obj_section *section)
2922 if (overlay_debugging && section)
2924 bfd *abfd = section->objfile->obfd;
2925 asection *bfd_section = section->the_bfd_section;
2927 if (bfd_section_lma (abfd, bfd_section) != 0
2928 && bfd_section_lma (abfd, bfd_section)
2929 != bfd_section_vma (abfd, bfd_section))
2936 /* Function: overlay_invalidate_all (void)
2937 Invalidate the mapped state of all overlay sections (mark it as stale). */
2940 overlay_invalidate_all (void)
2942 struct objfile *objfile;
2943 struct obj_section *sect;
2945 ALL_OBJSECTIONS (objfile, sect)
2946 if (section_is_overlay (sect))
2947 sect->ovly_mapped = -1;
2950 /* Function: section_is_mapped (SECTION)
2951 Returns true if section is an overlay, and is currently mapped.
2953 Access to the ovly_mapped flag is restricted to this function, so
2954 that we can do automatic update. If the global flag
2955 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
2956 overlay_invalidate_all. If the mapped state of the particular
2957 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
2960 section_is_mapped (struct obj_section *osect)
2962 struct gdbarch *gdbarch;
2964 if (osect == 0 || !section_is_overlay (osect))
2967 switch (overlay_debugging)
2971 return 0; /* overlay debugging off */
2972 case ovly_auto: /* overlay debugging automatic */
2973 /* Unles there is a gdbarch_overlay_update function,
2974 there's really nothing useful to do here (can't really go auto). */
2975 gdbarch = get_objfile_arch (osect->objfile);
2976 if (gdbarch_overlay_update_p (gdbarch))
2978 if (overlay_cache_invalid)
2980 overlay_invalidate_all ();
2981 overlay_cache_invalid = 0;
2983 if (osect->ovly_mapped == -1)
2984 gdbarch_overlay_update (gdbarch, osect);
2986 /* fall thru to manual case */
2987 case ovly_on: /* overlay debugging manual */
2988 return osect->ovly_mapped == 1;
2992 /* Function: pc_in_unmapped_range
2993 If PC falls into the lma range of SECTION, return true, else false. */
2996 pc_in_unmapped_range (CORE_ADDR pc, struct obj_section *section)
2998 if (section_is_overlay (section))
3000 bfd *abfd = section->objfile->obfd;
3001 asection *bfd_section = section->the_bfd_section;
3003 /* We assume the LMA is relocated by the same offset as the VMA. */
3004 bfd_vma size = bfd_get_section_size (bfd_section);
3005 CORE_ADDR offset = obj_section_offset (section);
3007 if (bfd_get_section_lma (abfd, bfd_section) + offset <= pc
3008 && pc < bfd_get_section_lma (abfd, bfd_section) + offset + size)
3015 /* Function: pc_in_mapped_range
3016 If PC falls into the vma range of SECTION, return true, else false. */
3019 pc_in_mapped_range (CORE_ADDR pc, struct obj_section *section)
3021 if (section_is_overlay (section))
3023 if (obj_section_addr (section) <= pc
3024 && pc < obj_section_endaddr (section))
3032 /* Return true if the mapped ranges of sections A and B overlap, false
3035 sections_overlap (struct obj_section *a, struct obj_section *b)
3037 CORE_ADDR a_start = obj_section_addr (a);
3038 CORE_ADDR a_end = obj_section_endaddr (a);
3039 CORE_ADDR b_start = obj_section_addr (b);
3040 CORE_ADDR b_end = obj_section_endaddr (b);
3042 return (a_start < b_end && b_start < a_end);
3045 /* Function: overlay_unmapped_address (PC, SECTION)
3046 Returns the address corresponding to PC in the unmapped (load) range.
3047 May be the same as PC. */
3050 overlay_unmapped_address (CORE_ADDR pc, struct obj_section *section)
3052 if (section_is_overlay (section) && pc_in_mapped_range (pc, section))
3054 bfd *abfd = section->objfile->obfd;
3055 asection *bfd_section = section->the_bfd_section;
3057 return pc + bfd_section_lma (abfd, bfd_section)
3058 - bfd_section_vma (abfd, bfd_section);
3064 /* Function: overlay_mapped_address (PC, SECTION)
3065 Returns the address corresponding to PC in the mapped (runtime) range.
3066 May be the same as PC. */
3069 overlay_mapped_address (CORE_ADDR pc, struct obj_section *section)
3071 if (section_is_overlay (section) && pc_in_unmapped_range (pc, section))
3073 bfd *abfd = section->objfile->obfd;
3074 asection *bfd_section = section->the_bfd_section;
3076 return pc + bfd_section_vma (abfd, bfd_section)
3077 - bfd_section_lma (abfd, bfd_section);
3084 /* Function: symbol_overlayed_address
3085 Return one of two addresses (relative to the VMA or to the LMA),
3086 depending on whether the section is mapped or not. */
3089 symbol_overlayed_address (CORE_ADDR address, struct obj_section *section)
3091 if (overlay_debugging)
3093 /* If the symbol has no section, just return its regular address. */
3096 /* If the symbol's section is not an overlay, just return its
3098 if (!section_is_overlay (section))
3100 /* If the symbol's section is mapped, just return its address. */
3101 if (section_is_mapped (section))
3104 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
3105 * then return its LOADED address rather than its vma address!!
3107 return overlay_unmapped_address (address, section);
3112 /* Function: find_pc_overlay (PC)
3113 Return the best-match overlay section for PC:
3114 If PC matches a mapped overlay section's VMA, return that section.
3115 Else if PC matches an unmapped section's VMA, return that section.
3116 Else if PC matches an unmapped section's LMA, return that section. */
3118 struct obj_section *
3119 find_pc_overlay (CORE_ADDR pc)
3121 struct objfile *objfile;
3122 struct obj_section *osect, *best_match = NULL;
3124 if (overlay_debugging)
3125 ALL_OBJSECTIONS (objfile, osect)
3126 if (section_is_overlay (osect))
3128 if (pc_in_mapped_range (pc, osect))
3130 if (section_is_mapped (osect))
3135 else if (pc_in_unmapped_range (pc, osect))
3141 /* Function: find_pc_mapped_section (PC)
3142 If PC falls into the VMA address range of an overlay section that is
3143 currently marked as MAPPED, return that section. Else return NULL. */
3145 struct obj_section *
3146 find_pc_mapped_section (CORE_ADDR pc)
3148 struct objfile *objfile;
3149 struct obj_section *osect;
3151 if (overlay_debugging)
3152 ALL_OBJSECTIONS (objfile, osect)
3153 if (pc_in_mapped_range (pc, osect) && section_is_mapped (osect))
3159 /* Function: list_overlays_command
3160 Print a list of mapped sections and their PC ranges. */
3163 list_overlays_command (char *args, int from_tty)
3166 struct objfile *objfile;
3167 struct obj_section *osect;
3169 if (overlay_debugging)
3170 ALL_OBJSECTIONS (objfile, osect)
3171 if (section_is_mapped (osect))
3173 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3178 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section);
3179 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section);
3180 size = bfd_get_section_size (osect->the_bfd_section);
3181 name = bfd_section_name (objfile->obfd, osect->the_bfd_section);
3183 printf_filtered ("Section %s, loaded at ", name);
3184 fputs_filtered (paddress (gdbarch, lma), gdb_stdout);
3185 puts_filtered (" - ");
3186 fputs_filtered (paddress (gdbarch, lma + size), gdb_stdout);
3187 printf_filtered (", mapped at ");
3188 fputs_filtered (paddress (gdbarch, vma), gdb_stdout);
3189 puts_filtered (" - ");
3190 fputs_filtered (paddress (gdbarch, vma + size), gdb_stdout);
3191 puts_filtered ("\n");
3196 printf_filtered (_("No sections are mapped.\n"));
3199 /* Function: map_overlay_command
3200 Mark the named section as mapped (ie. residing at its VMA address). */
3203 map_overlay_command (char *args, int from_tty)
3205 struct objfile *objfile, *objfile2;
3206 struct obj_section *sec, *sec2;
3208 if (!overlay_debugging)
3209 error (_("Overlay debugging not enabled. Use "
3210 "either the 'overlay auto' or\n"
3211 "the 'overlay manual' command."));
3213 if (args == 0 || *args == 0)
3214 error (_("Argument required: name of an overlay section"));
3216 /* First, find a section matching the user supplied argument. */
3217 ALL_OBJSECTIONS (objfile, sec)
3218 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
3220 /* Now, check to see if the section is an overlay. */
3221 if (!section_is_overlay (sec))
3222 continue; /* not an overlay section */
3224 /* Mark the overlay as "mapped". */
3225 sec->ovly_mapped = 1;
3227 /* Next, make a pass and unmap any sections that are
3228 overlapped by this new section: */
3229 ALL_OBJSECTIONS (objfile2, sec2)
3230 if (sec2->ovly_mapped && sec != sec2 && sections_overlap (sec, sec2))
3233 printf_unfiltered (_("Note: section %s unmapped by overlap\n"),
3234 bfd_section_name (objfile->obfd,
3235 sec2->the_bfd_section));
3236 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2. */
3240 error (_("No overlay section called %s"), args);
3243 /* Function: unmap_overlay_command
3244 Mark the overlay section as unmapped
3245 (ie. resident in its LMA address range, rather than the VMA range). */
3248 unmap_overlay_command (char *args, int from_tty)
3250 struct objfile *objfile;
3251 struct obj_section *sec;
3253 if (!overlay_debugging)
3254 error (_("Overlay debugging not enabled. "
3255 "Use either the 'overlay auto' or\n"
3256 "the 'overlay manual' command."));
3258 if (args == 0 || *args == 0)
3259 error (_("Argument required: name of an overlay section"));
3261 /* First, find a section matching the user supplied argument. */
3262 ALL_OBJSECTIONS (objfile, sec)
3263 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
3265 if (!sec->ovly_mapped)
3266 error (_("Section %s is not mapped"), args);
3267 sec->ovly_mapped = 0;
3270 error (_("No overlay section called %s"), args);
3273 /* Function: overlay_auto_command
3274 A utility command to turn on overlay debugging.
3275 Possibly this should be done via a set/show command. */
3278 overlay_auto_command (char *args, int from_tty)
3280 overlay_debugging = ovly_auto;
3281 enable_overlay_breakpoints ();
3283 printf_unfiltered (_("Automatic overlay debugging enabled."));
3286 /* Function: overlay_manual_command
3287 A utility command to turn on overlay debugging.
3288 Possibly this should be done via a set/show command. */
3291 overlay_manual_command (char *args, int from_tty)
3293 overlay_debugging = ovly_on;
3294 disable_overlay_breakpoints ();
3296 printf_unfiltered (_("Overlay debugging enabled."));
3299 /* Function: overlay_off_command
3300 A utility command to turn on overlay debugging.
3301 Possibly this should be done via a set/show command. */
3304 overlay_off_command (char *args, int from_tty)
3306 overlay_debugging = ovly_off;
3307 disable_overlay_breakpoints ();
3309 printf_unfiltered (_("Overlay debugging disabled."));
3313 overlay_load_command (char *args, int from_tty)
3315 struct gdbarch *gdbarch = get_current_arch ();
3317 if (gdbarch_overlay_update_p (gdbarch))
3318 gdbarch_overlay_update (gdbarch, NULL);
3320 error (_("This target does not know how to read its overlay state."));
3323 /* Function: overlay_command
3324 A place-holder for a mis-typed command. */
3326 /* Command list chain containing all defined "overlay" subcommands. */
3327 struct cmd_list_element *overlaylist;
3330 overlay_command (char *args, int from_tty)
3333 ("\"overlay\" must be followed by the name of an overlay command.\n");
3334 help_list (overlaylist, "overlay ", -1, gdb_stdout);
3338 /* Target Overlays for the "Simplest" overlay manager:
3340 This is GDB's default target overlay layer. It works with the
3341 minimal overlay manager supplied as an example by Cygnus. The
3342 entry point is via a function pointer "gdbarch_overlay_update",
3343 so targets that use a different runtime overlay manager can
3344 substitute their own overlay_update function and take over the
3347 The overlay_update function pokes around in the target's data structures
3348 to see what overlays are mapped, and updates GDB's overlay mapping with
3351 In this simple implementation, the target data structures are as follows:
3352 unsigned _novlys; /# number of overlay sections #/
3353 unsigned _ovly_table[_novlys][4] = {
3354 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
3355 {..., ..., ..., ...},
3357 unsigned _novly_regions; /# number of overlay regions #/
3358 unsigned _ovly_region_table[_novly_regions][3] = {
3359 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
3362 These functions will attempt to update GDB's mappedness state in the
3363 symbol section table, based on the target's mappedness state.
3365 To do this, we keep a cached copy of the target's _ovly_table, and
3366 attempt to detect when the cached copy is invalidated. The main
3367 entry point is "simple_overlay_update(SECT), which looks up SECT in
3368 the cached table and re-reads only the entry for that section from
3369 the target (whenever possible). */
3371 /* Cached, dynamically allocated copies of the target data structures: */
3372 static unsigned (*cache_ovly_table)[4] = 0;
3373 static unsigned cache_novlys = 0;
3374 static CORE_ADDR cache_ovly_table_base = 0;
3377 VMA, SIZE, LMA, MAPPED
3380 /* Throw away the cached copy of _ovly_table. */
3382 simple_free_overlay_table (void)
3384 if (cache_ovly_table)
3385 xfree (cache_ovly_table);
3387 cache_ovly_table = NULL;
3388 cache_ovly_table_base = 0;
3391 /* Read an array of ints of size SIZE from the target into a local buffer.
3392 Convert to host order. int LEN is number of ints. */
3394 read_target_long_array (CORE_ADDR memaddr, unsigned int *myaddr,
3395 int len, int size, enum bfd_endian byte_order)
3397 /* FIXME (alloca): Not safe if array is very large. */
3398 gdb_byte *buf = alloca (len * size);
3401 read_memory (memaddr, buf, len * size);
3402 for (i = 0; i < len; i++)
3403 myaddr[i] = extract_unsigned_integer (size * i + buf, size, byte_order);
3406 /* Find and grab a copy of the target _ovly_table
3407 (and _novlys, which is needed for the table's size). */
3409 simple_read_overlay_table (void)
3411 struct minimal_symbol *novlys_msym, *ovly_table_msym;
3412 struct gdbarch *gdbarch;
3414 enum bfd_endian byte_order;
3416 simple_free_overlay_table ();
3417 novlys_msym = lookup_minimal_symbol ("_novlys", NULL, NULL);
3420 error (_("Error reading inferior's overlay table: "
3421 "couldn't find `_novlys' variable\n"
3422 "in inferior. Use `overlay manual' mode."));
3426 ovly_table_msym = lookup_minimal_symbol ("_ovly_table", NULL, NULL);
3427 if (! ovly_table_msym)
3429 error (_("Error reading inferior's overlay table: couldn't find "
3430 "`_ovly_table' array\n"
3431 "in inferior. Use `overlay manual' mode."));
3435 gdbarch = get_objfile_arch (msymbol_objfile (ovly_table_msym));
3436 word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
3437 byte_order = gdbarch_byte_order (gdbarch);
3439 cache_novlys = read_memory_integer (SYMBOL_VALUE_ADDRESS (novlys_msym),
3442 = (void *) xmalloc (cache_novlys * sizeof (*cache_ovly_table));
3443 cache_ovly_table_base = SYMBOL_VALUE_ADDRESS (ovly_table_msym);
3444 read_target_long_array (cache_ovly_table_base,
3445 (unsigned int *) cache_ovly_table,
3446 cache_novlys * 4, word_size, byte_order);
3448 return 1; /* SUCCESS */
3451 /* Function: simple_overlay_update_1
3452 A helper function for simple_overlay_update. Assuming a cached copy
3453 of _ovly_table exists, look through it to find an entry whose vma,
3454 lma and size match those of OSECT. Re-read the entry and make sure
3455 it still matches OSECT (else the table may no longer be valid).
3456 Set OSECT's mapped state to match the entry. Return: 1 for
3457 success, 0 for failure. */
3460 simple_overlay_update_1 (struct obj_section *osect)
3463 bfd *obfd = osect->objfile->obfd;
3464 asection *bsect = osect->the_bfd_section;
3465 struct gdbarch *gdbarch = get_objfile_arch (osect->objfile);
3466 int word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
3467 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
3469 size = bfd_get_section_size (osect->the_bfd_section);
3470 for (i = 0; i < cache_novlys; i++)
3471 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3472 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3473 /* && cache_ovly_table[i][SIZE] == size */ )
3475 read_target_long_array (cache_ovly_table_base + i * word_size,
3476 (unsigned int *) cache_ovly_table[i],
3477 4, word_size, byte_order);
3478 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3479 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3480 /* && cache_ovly_table[i][SIZE] == size */ )
3482 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3485 else /* Warning! Warning! Target's ovly table has changed! */
3491 /* Function: simple_overlay_update
3492 If OSECT is NULL, then update all sections' mapped state
3493 (after re-reading the entire target _ovly_table).
3494 If OSECT is non-NULL, then try to find a matching entry in the
3495 cached ovly_table and update only OSECT's mapped state.
3496 If a cached entry can't be found or the cache isn't valid, then
3497 re-read the entire cache, and go ahead and update all sections. */
3500 simple_overlay_update (struct obj_section *osect)
3502 struct objfile *objfile;
3504 /* Were we given an osect to look up? NULL means do all of them. */
3506 /* Have we got a cached copy of the target's overlay table? */
3507 if (cache_ovly_table != NULL)
3509 /* Does its cached location match what's currently in the
3511 struct minimal_symbol *minsym
3512 = lookup_minimal_symbol ("_ovly_table", NULL, NULL);
3515 error (_("Error reading inferior's overlay table: couldn't "
3516 "find `_ovly_table' array\n"
3517 "in inferior. Use `overlay manual' mode."));
3519 if (cache_ovly_table_base == SYMBOL_VALUE_ADDRESS (minsym))
3520 /* Then go ahead and try to look up this single section in
3522 if (simple_overlay_update_1 (osect))
3523 /* Found it! We're done. */
3527 /* Cached table no good: need to read the entire table anew.
3528 Or else we want all the sections, in which case it's actually
3529 more efficient to read the whole table in one block anyway. */
3531 if (! simple_read_overlay_table ())
3534 /* Now may as well update all sections, even if only one was requested. */
3535 ALL_OBJSECTIONS (objfile, osect)
3536 if (section_is_overlay (osect))
3539 bfd *obfd = osect->objfile->obfd;
3540 asection *bsect = osect->the_bfd_section;
3542 size = bfd_get_section_size (bsect);
3543 for (i = 0; i < cache_novlys; i++)
3544 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3545 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3546 /* && cache_ovly_table[i][SIZE] == size */ )
3547 { /* obj_section matches i'th entry in ovly_table. */
3548 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3549 break; /* finished with inner for loop: break out. */
3554 /* Set the output sections and output offsets for section SECTP in
3555 ABFD. The relocation code in BFD will read these offsets, so we
3556 need to be sure they're initialized. We map each section to itself,
3557 with no offset; this means that SECTP->vma will be honored. */
3560 symfile_dummy_outputs (bfd *abfd, asection *sectp, void *dummy)
3562 sectp->output_section = sectp;
3563 sectp->output_offset = 0;
3566 /* Default implementation for sym_relocate. */
3570 default_symfile_relocate (struct objfile *objfile, asection *sectp,
3573 bfd *abfd = objfile->obfd;
3575 /* We're only interested in sections with relocation
3577 if ((sectp->flags & SEC_RELOC) == 0)
3580 /* We will handle section offsets properly elsewhere, so relocate as if
3581 all sections begin at 0. */
3582 bfd_map_over_sections (abfd, symfile_dummy_outputs, NULL);
3584 return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL);
3587 /* Relocate the contents of a debug section SECTP in ABFD. The
3588 contents are stored in BUF if it is non-NULL, or returned in a
3589 malloc'd buffer otherwise.
3591 For some platforms and debug info formats, shared libraries contain
3592 relocations against the debug sections (particularly for DWARF-2;
3593 one affected platform is PowerPC GNU/Linux, although it depends on
3594 the version of the linker in use). Also, ELF object files naturally
3595 have unresolved relocations for their debug sections. We need to apply
3596 the relocations in order to get the locations of symbols correct.
3597 Another example that may require relocation processing, is the
3598 DWARF-2 .eh_frame section in .o files, although it isn't strictly a
3602 symfile_relocate_debug_section (struct objfile *objfile,
3603 asection *sectp, bfd_byte *buf)
3605 gdb_assert (objfile->sf->sym_relocate);
3607 return (*objfile->sf->sym_relocate) (objfile, sectp, buf);
3610 struct symfile_segment_data *
3611 get_symfile_segment_data (bfd *abfd)
3613 const struct sym_fns *sf = find_sym_fns (abfd);
3618 return sf->sym_segments (abfd);
3622 free_symfile_segment_data (struct symfile_segment_data *data)
3624 xfree (data->segment_bases);
3625 xfree (data->segment_sizes);
3626 xfree (data->segment_info);
3632 - DATA, containing segment addresses from the object file ABFD, and
3633 the mapping from ABFD's sections onto the segments that own them,
3635 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual
3636 segment addresses reported by the target,
3637 store the appropriate offsets for each section in OFFSETS.
3639 If there are fewer entries in SEGMENT_BASES than there are segments
3640 in DATA, then apply SEGMENT_BASES' last entry to all the segments.
3642 If there are more entries, then ignore the extra. The target may
3643 not be able to distinguish between an empty data segment and a
3644 missing data segment; a missing text segment is less plausible. */
3646 symfile_map_offsets_to_segments (bfd *abfd, struct symfile_segment_data *data,
3647 struct section_offsets *offsets,
3648 int num_segment_bases,
3649 const CORE_ADDR *segment_bases)
3654 /* It doesn't make sense to call this function unless you have some
3655 segment base addresses. */
3656 gdb_assert (num_segment_bases > 0);
3658 /* If we do not have segment mappings for the object file, we
3659 can not relocate it by segments. */
3660 gdb_assert (data != NULL);
3661 gdb_assert (data->num_segments > 0);
3663 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
3665 int which = data->segment_info[i];
3667 gdb_assert (0 <= which && which <= data->num_segments);
3669 /* Don't bother computing offsets for sections that aren't
3670 loaded as part of any segment. */
3674 /* Use the last SEGMENT_BASES entry as the address of any extra
3675 segments mentioned in DATA->segment_info. */
3676 if (which > num_segment_bases)
3677 which = num_segment_bases;
3679 offsets->offsets[i] = (segment_bases[which - 1]
3680 - data->segment_bases[which - 1]);
3687 symfile_find_segment_sections (struct objfile *objfile)
3689 bfd *abfd = objfile->obfd;
3692 struct symfile_segment_data *data;
3694 data = get_symfile_segment_data (objfile->obfd);
3698 if (data->num_segments != 1 && data->num_segments != 2)
3700 free_symfile_segment_data (data);
3704 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
3706 int which = data->segment_info[i];
3710 if (objfile->sect_index_text == -1)
3711 objfile->sect_index_text = sect->index;
3713 if (objfile->sect_index_rodata == -1)
3714 objfile->sect_index_rodata = sect->index;
3716 else if (which == 2)
3718 if (objfile->sect_index_data == -1)
3719 objfile->sect_index_data = sect->index;
3721 if (objfile->sect_index_bss == -1)
3722 objfile->sect_index_bss = sect->index;
3726 free_symfile_segment_data (data);
3730 _initialize_symfile (void)
3732 struct cmd_list_element *c;
3734 c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\
3735 Load symbol table from executable file FILE.\n\
3736 The `file' command can also load symbol tables, as well as setting the file\n\
3737 to execute."), &cmdlist);
3738 set_cmd_completer (c, filename_completer);
3740 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command, _("\
3741 Load symbols from FILE, assuming FILE has been dynamically loaded.\n\
3742 Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR>\
3743 ...]\nADDR is the starting address of the file's text.\n\
3744 The optional arguments are section-name section-address pairs and\n\
3745 should be specified if the data and bss segments are not contiguous\n\
3746 with the text. SECT is a section name to be loaded at SECT_ADDR."),
3748 set_cmd_completer (c, filename_completer);
3750 c = add_cmd ("load", class_files, load_command, _("\
3751 Dynamically load FILE into the running program, and record its symbols\n\
3752 for access from GDB.\n\
3753 A load OFFSET may also be given."), &cmdlist);
3754 set_cmd_completer (c, filename_completer);
3756 add_setshow_boolean_cmd ("symbol-reloading", class_support,
3757 &symbol_reloading, _("\
3758 Set dynamic symbol table reloading multiple times in one run."), _("\
3759 Show dynamic symbol table reloading multiple times in one run."), NULL,
3761 show_symbol_reloading,
3762 &setlist, &showlist);
3764 add_prefix_cmd ("overlay", class_support, overlay_command,
3765 _("Commands for debugging overlays."), &overlaylist,
3766 "overlay ", 0, &cmdlist);
3768 add_com_alias ("ovly", "overlay", class_alias, 1);
3769 add_com_alias ("ov", "overlay", class_alias, 1);
3771 add_cmd ("map-overlay", class_support, map_overlay_command,
3772 _("Assert that an overlay section is mapped."), &overlaylist);
3774 add_cmd ("unmap-overlay", class_support, unmap_overlay_command,
3775 _("Assert that an overlay section is unmapped."), &overlaylist);
3777 add_cmd ("list-overlays", class_support, list_overlays_command,
3778 _("List mappings of overlay sections."), &overlaylist);
3780 add_cmd ("manual", class_support, overlay_manual_command,
3781 _("Enable overlay debugging."), &overlaylist);
3782 add_cmd ("off", class_support, overlay_off_command,
3783 _("Disable overlay debugging."), &overlaylist);
3784 add_cmd ("auto", class_support, overlay_auto_command,
3785 _("Enable automatic overlay debugging."), &overlaylist);
3786 add_cmd ("load-target", class_support, overlay_load_command,
3787 _("Read the overlay mapping state from the target."), &overlaylist);
3789 /* Filename extension to source language lookup table: */
3790 init_filename_language_table ();
3791 add_setshow_string_noescape_cmd ("extension-language", class_files,
3793 Set mapping between filename extension and source language."), _("\
3794 Show mapping between filename extension and source language."), _("\
3795 Usage: set extension-language .foo bar"),
3796 set_ext_lang_command,
3798 &setlist, &showlist);
3800 add_info ("extensions", info_ext_lang_command,
3801 _("All filename extensions associated with a source language."));
3803 add_setshow_optional_filename_cmd ("debug-file-directory", class_support,
3804 &debug_file_directory, _("\
3805 Set the directories where separate debug symbols are searched for."), _("\
3806 Show the directories where separate debug symbols are searched for."), _("\
3807 Separate debug symbols are first searched for in the same\n\
3808 directory as the binary, then in the `" DEBUG_SUBDIRECTORY "' subdirectory,\n\
3809 and lastly at the path of the directory of the binary with\n\
3810 each global debug-file-directory component prepended."),
3812 show_debug_file_directory,
3813 &setlist, &showlist);