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"
60 #include <sys/types.h>
62 #include "gdb_string.h"
70 int (*deprecated_ui_load_progress_hook) (const char *section,
72 void (*deprecated_show_load_progress) (const char *section,
73 unsigned long section_sent,
74 unsigned long section_size,
75 unsigned long total_sent,
76 unsigned long total_size);
77 void (*deprecated_pre_add_symbol_hook) (const char *);
78 void (*deprecated_post_add_symbol_hook) (void);
80 static void clear_symtab_users_cleanup (void *ignore);
82 /* Global variables owned by this file. */
83 int readnow_symbol_files; /* Read full symbols immediately. */
85 /* Functions this file defines. */
87 static void load_command (char *, int);
89 static void symbol_file_add_main_1 (char *args, int from_tty, int flags);
91 static void add_symbol_file_command (char *, int);
93 bfd *symfile_bfd_open (char *);
95 int get_section_index (struct objfile *, char *);
97 static const struct sym_fns *find_sym_fns (bfd *);
99 static void decrement_reading_symtab (void *);
101 static void overlay_invalidate_all (void);
103 void list_overlays_command (char *, int);
105 void map_overlay_command (char *, int);
107 void unmap_overlay_command (char *, int);
109 static void overlay_auto_command (char *, int);
111 static void overlay_manual_command (char *, int);
113 static void overlay_off_command (char *, int);
115 static void overlay_load_command (char *, int);
117 static void overlay_command (char *, int);
119 static void simple_free_overlay_table (void);
121 static void read_target_long_array (CORE_ADDR, unsigned int *, int, int,
124 static int simple_read_overlay_table (void);
126 static int simple_overlay_update_1 (struct obj_section *);
128 static void add_filename_language (char *ext, enum language lang);
130 static void info_ext_lang_command (char *args, int from_tty);
132 static void init_filename_language_table (void);
134 static void symfile_find_segment_sections (struct objfile *objfile);
136 void _initialize_symfile (void);
138 /* List of all available sym_fns. On gdb startup, each object file reader
139 calls add_symtab_fns() to register information on each format it is
142 typedef const struct sym_fns *sym_fns_ptr;
143 DEF_VEC_P (sym_fns_ptr);
145 static VEC (sym_fns_ptr) *symtab_fns = NULL;
147 /* If non-zero, shared library symbols will be added automatically
148 when the inferior is created, new libraries are loaded, or when
149 attaching to the inferior. This is almost always what users will
150 want to have happen; but for very large programs, the startup time
151 will be excessive, and so if this is a problem, the user can clear
152 this flag and then add the shared library symbols as needed. Note
153 that there is a potential for confusion, since if the shared
154 library symbols are not loaded, commands like "info fun" will *not*
155 report all the functions that are actually present. */
157 int auto_solib_add = 1;
160 /* Make a null terminated copy of the string at PTR with SIZE characters in
161 the obstack pointed to by OBSTACKP . Returns the address of the copy.
162 Note that the string at PTR does not have to be null terminated, I.e. it
163 may be part of a larger string and we are only saving a substring. */
166 obsavestring (const char *ptr, int size, struct obstack *obstackp)
168 char *p = (char *) obstack_alloc (obstackp, size + 1);
169 /* Open-coded memcpy--saves function call time. These strings are usually
170 short. FIXME: Is this really still true with a compiler that can
173 const char *p1 = ptr;
175 const char *end = ptr + size;
184 /* Concatenate NULL terminated variable argument list of `const char *'
185 strings; return the new string. Space is found in the OBSTACKP.
186 Argument list must be terminated by a sentinel expression `(char *)
190 obconcat (struct obstack *obstackp, ...)
194 va_start (ap, obstackp);
197 const char *s = va_arg (ap, const char *);
202 obstack_grow_str (obstackp, s);
205 obstack_1grow (obstackp, 0);
207 return obstack_finish (obstackp);
210 /* True if we are reading a symbol table. */
212 int currently_reading_symtab = 0;
215 decrement_reading_symtab (void *dummy)
217 currently_reading_symtab--;
220 /* Increment currently_reading_symtab and return a cleanup that can be
221 used to decrement it. */
223 increment_reading_symtab (void)
225 ++currently_reading_symtab;
226 return make_cleanup (decrement_reading_symtab, NULL);
229 /* Remember the lowest-addressed loadable section we've seen.
230 This function is called via bfd_map_over_sections.
232 In case of equal vmas, the section with the largest size becomes the
233 lowest-addressed loadable section.
235 If the vmas and sizes are equal, the last section is considered the
236 lowest-addressed loadable section. */
239 find_lowest_section (bfd *abfd, asection *sect, void *obj)
241 asection **lowest = (asection **) obj;
243 if (0 == (bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD)))
246 *lowest = sect; /* First loadable section */
247 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
248 *lowest = sect; /* A lower loadable section */
249 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
250 && (bfd_section_size (abfd, (*lowest))
251 <= bfd_section_size (abfd, sect)))
255 /* Create a new section_addr_info, with room for NUM_SECTIONS. */
257 struct section_addr_info *
258 alloc_section_addr_info (size_t num_sections)
260 struct section_addr_info *sap;
263 size = (sizeof (struct section_addr_info)
264 + sizeof (struct other_sections) * (num_sections - 1));
265 sap = (struct section_addr_info *) xmalloc (size);
266 memset (sap, 0, size);
267 sap->num_sections = num_sections;
272 /* Build (allocate and populate) a section_addr_info struct from
273 an existing section table. */
275 extern struct section_addr_info *
276 build_section_addr_info_from_section_table (const struct target_section *start,
277 const struct target_section *end)
279 struct section_addr_info *sap;
280 const struct target_section *stp;
283 sap = alloc_section_addr_info (end - start);
285 for (stp = start, oidx = 0; stp != end; stp++)
287 if (bfd_get_section_flags (stp->bfd,
288 stp->the_bfd_section) & (SEC_ALLOC | SEC_LOAD)
289 && oidx < end - start)
291 sap->other[oidx].addr = stp->addr;
292 sap->other[oidx].name
293 = xstrdup (bfd_section_name (stp->bfd, stp->the_bfd_section));
294 sap->other[oidx].sectindex = stp->the_bfd_section->index;
302 /* Create a section_addr_info from section offsets in ABFD. */
304 static struct section_addr_info *
305 build_section_addr_info_from_bfd (bfd *abfd)
307 struct section_addr_info *sap;
309 struct bfd_section *sec;
311 sap = alloc_section_addr_info (bfd_count_sections (abfd));
312 for (i = 0, sec = abfd->sections; sec != NULL; sec = sec->next)
313 if (bfd_get_section_flags (abfd, sec) & (SEC_ALLOC | SEC_LOAD))
315 sap->other[i].addr = bfd_get_section_vma (abfd, sec);
316 sap->other[i].name = xstrdup (bfd_get_section_name (abfd, sec));
317 sap->other[i].sectindex = sec->index;
323 /* Create a section_addr_info from section offsets in OBJFILE. */
325 struct section_addr_info *
326 build_section_addr_info_from_objfile (const struct objfile *objfile)
328 struct section_addr_info *sap;
331 /* Before reread_symbols gets rewritten it is not safe to call:
332 gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd));
334 sap = build_section_addr_info_from_bfd (objfile->obfd);
335 for (i = 0; i < sap->num_sections && sap->other[i].name; i++)
337 int sectindex = sap->other[i].sectindex;
339 sap->other[i].addr += objfile->section_offsets->offsets[sectindex];
344 /* Free all memory allocated by build_section_addr_info_from_section_table. */
347 free_section_addr_info (struct section_addr_info *sap)
351 for (idx = 0; idx < sap->num_sections; idx++)
352 if (sap->other[idx].name)
353 xfree (sap->other[idx].name);
358 /* Initialize OBJFILE's sect_index_* members. */
360 init_objfile_sect_indices (struct objfile *objfile)
365 sect = bfd_get_section_by_name (objfile->obfd, ".text");
367 objfile->sect_index_text = sect->index;
369 sect = bfd_get_section_by_name (objfile->obfd, ".data");
371 objfile->sect_index_data = sect->index;
373 sect = bfd_get_section_by_name (objfile->obfd, ".bss");
375 objfile->sect_index_bss = sect->index;
377 sect = bfd_get_section_by_name (objfile->obfd, ".rodata");
379 objfile->sect_index_rodata = sect->index;
381 /* This is where things get really weird... We MUST have valid
382 indices for the various sect_index_* members or gdb will abort.
383 So if for example, there is no ".text" section, we have to
384 accomodate that. First, check for a file with the standard
385 one or two segments. */
387 symfile_find_segment_sections (objfile);
389 /* Except when explicitly adding symbol files at some address,
390 section_offsets contains nothing but zeros, so it doesn't matter
391 which slot in section_offsets the individual sect_index_* members
392 index into. So if they are all zero, it is safe to just point
393 all the currently uninitialized indices to the first slot. But
394 beware: if this is the main executable, it may be relocated
395 later, e.g. by the remote qOffsets packet, and then this will
396 be wrong! That's why we try segments first. */
398 for (i = 0; i < objfile->num_sections; i++)
400 if (ANOFFSET (objfile->section_offsets, i) != 0)
405 if (i == objfile->num_sections)
407 if (objfile->sect_index_text == -1)
408 objfile->sect_index_text = 0;
409 if (objfile->sect_index_data == -1)
410 objfile->sect_index_data = 0;
411 if (objfile->sect_index_bss == -1)
412 objfile->sect_index_bss = 0;
413 if (objfile->sect_index_rodata == -1)
414 objfile->sect_index_rodata = 0;
418 /* The arguments to place_section. */
420 struct place_section_arg
422 struct section_offsets *offsets;
426 /* Find a unique offset to use for loadable section SECT if
427 the user did not provide an offset. */
430 place_section (bfd *abfd, asection *sect, void *obj)
432 struct place_section_arg *arg = obj;
433 CORE_ADDR *offsets = arg->offsets->offsets, start_addr;
435 ULONGEST align = ((ULONGEST) 1) << bfd_get_section_alignment (abfd, sect);
437 /* We are only interested in allocated sections. */
438 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
441 /* If the user specified an offset, honor it. */
442 if (offsets[sect->index] != 0)
445 /* Otherwise, let's try to find a place for the section. */
446 start_addr = (arg->lowest + align - 1) & -align;
453 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
455 int indx = cur_sec->index;
457 /* We don't need to compare against ourself. */
461 /* We can only conflict with allocated sections. */
462 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
465 /* If the section offset is 0, either the section has not been placed
466 yet, or it was the lowest section placed (in which case LOWEST
467 will be past its end). */
468 if (offsets[indx] == 0)
471 /* If this section would overlap us, then we must move up. */
472 if (start_addr + bfd_get_section_size (sect) > offsets[indx]
473 && start_addr < offsets[indx] + bfd_get_section_size (cur_sec))
475 start_addr = offsets[indx] + bfd_get_section_size (cur_sec);
476 start_addr = (start_addr + align - 1) & -align;
481 /* Otherwise, we appear to be OK. So far. */
486 offsets[sect->index] = start_addr;
487 arg->lowest = start_addr + bfd_get_section_size (sect);
490 /* Store struct section_addr_info as prepared (made relative and with SECTINDEX
491 filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS
495 relative_addr_info_to_section_offsets (struct section_offsets *section_offsets,
497 struct section_addr_info *addrs)
501 memset (section_offsets, 0, SIZEOF_N_SECTION_OFFSETS (num_sections));
503 /* Now calculate offsets for section that were specified by the caller. */
504 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
506 struct other_sections *osp;
508 osp = &addrs->other[i];
509 if (osp->sectindex == -1)
512 /* Record all sections in offsets. */
513 /* The section_offsets in the objfile are here filled in using
515 section_offsets->offsets[osp->sectindex] = osp->addr;
519 /* Transform section name S for a name comparison. prelink can split section
520 `.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly
521 prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address
522 of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss'
523 (`.sbss') section has invalid (increased) virtual address. */
526 addr_section_name (const char *s)
528 if (strcmp (s, ".dynbss") == 0)
530 if (strcmp (s, ".sdynbss") == 0)
536 /* qsort comparator for addrs_section_sort. Sort entries in ascending order by
537 their (name, sectindex) pair. sectindex makes the sort by name stable. */
540 addrs_section_compar (const void *ap, const void *bp)
542 const struct other_sections *a = *((struct other_sections **) ap);
543 const struct other_sections *b = *((struct other_sections **) bp);
546 retval = strcmp (addr_section_name (a->name), addr_section_name (b->name));
550 return a->sectindex - b->sectindex;
553 /* Provide sorted array of pointers to sections of ADDRS. The array is
554 terminated by NULL. Caller is responsible to call xfree for it. */
556 static struct other_sections **
557 addrs_section_sort (struct section_addr_info *addrs)
559 struct other_sections **array;
562 /* `+ 1' for the NULL terminator. */
563 array = xmalloc (sizeof (*array) * (addrs->num_sections + 1));
564 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
565 array[i] = &addrs->other[i];
568 qsort (array, i, sizeof (*array), addrs_section_compar);
573 /* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in
574 also SECTINDEXes specific to ABFD there. This function can be used to
575 rebase ADDRS to start referencing different BFD than before. */
578 addr_info_make_relative (struct section_addr_info *addrs, bfd *abfd)
580 asection *lower_sect;
581 CORE_ADDR lower_offset;
583 struct cleanup *my_cleanup;
584 struct section_addr_info *abfd_addrs;
585 struct other_sections **addrs_sorted, **abfd_addrs_sorted;
586 struct other_sections **addrs_to_abfd_addrs;
588 /* Find lowest loadable section to be used as starting point for
589 continguous sections. */
591 bfd_map_over_sections (abfd, find_lowest_section, &lower_sect);
592 if (lower_sect == NULL)
594 warning (_("no loadable sections found in added symbol-file %s"),
595 bfd_get_filename (abfd));
599 lower_offset = bfd_section_vma (bfd_get_filename (abfd), lower_sect);
601 /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections
602 in ABFD. Section names are not unique - there can be multiple sections of
603 the same name. Also the sections of the same name do not have to be
604 adjacent to each other. Some sections may be present only in one of the
605 files. Even sections present in both files do not have to be in the same
608 Use stable sort by name for the sections in both files. Then linearly
609 scan both lists matching as most of the entries as possible. */
611 addrs_sorted = addrs_section_sort (addrs);
612 my_cleanup = make_cleanup (xfree, addrs_sorted);
614 abfd_addrs = build_section_addr_info_from_bfd (abfd);
615 make_cleanup_free_section_addr_info (abfd_addrs);
616 abfd_addrs_sorted = addrs_section_sort (abfd_addrs);
617 make_cleanup (xfree, abfd_addrs_sorted);
619 /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and
620 ABFD_ADDRS_SORTED. */
622 addrs_to_abfd_addrs = xzalloc (sizeof (*addrs_to_abfd_addrs)
623 * addrs->num_sections);
624 make_cleanup (xfree, addrs_to_abfd_addrs);
626 while (*addrs_sorted)
628 const char *sect_name = addr_section_name ((*addrs_sorted)->name);
630 while (*abfd_addrs_sorted
631 && strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
635 if (*abfd_addrs_sorted
636 && strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
641 /* Make the found item directly addressable from ADDRS. */
642 index_in_addrs = *addrs_sorted - addrs->other;
643 gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL);
644 addrs_to_abfd_addrs[index_in_addrs] = *abfd_addrs_sorted;
646 /* Never use the same ABFD entry twice. */
653 /* Calculate offsets for the loadable sections.
654 FIXME! Sections must be in order of increasing loadable section
655 so that contiguous sections can use the lower-offset!!!
657 Adjust offsets if the segments are not contiguous.
658 If the section is contiguous, its offset should be set to
659 the offset of the highest loadable section lower than it
660 (the loadable section directly below it in memory).
661 this_offset = lower_offset = lower_addr - lower_orig_addr */
663 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
665 struct other_sections *sect = addrs_to_abfd_addrs[i];
669 /* This is the index used by BFD. */
670 addrs->other[i].sectindex = sect->sectindex;
672 if (addrs->other[i].addr != 0)
674 addrs->other[i].addr -= sect->addr;
675 lower_offset = addrs->other[i].addr;
678 addrs->other[i].addr = lower_offset;
682 /* addr_section_name transformation is not used for SECT_NAME. */
683 const char *sect_name = addrs->other[i].name;
685 /* This section does not exist in ABFD, which is normally
686 unexpected and we want to issue a warning.
688 However, the ELF prelinker does create a few sections which are
689 marked in the main executable as loadable (they are loaded in
690 memory from the DYNAMIC segment) and yet are not present in
691 separate debug info files. This is fine, and should not cause
692 a warning. Shared libraries contain just the section
693 ".gnu.liblist" but it is not marked as loadable there. There is
694 no other way to identify them than by their name as the sections
695 created by prelink have no special flags.
697 For the sections `.bss' and `.sbss' see addr_section_name. */
699 if (!(strcmp (sect_name, ".gnu.liblist") == 0
700 || strcmp (sect_name, ".gnu.conflict") == 0
701 || (strcmp (sect_name, ".bss") == 0
703 && strcmp (addrs->other[i - 1].name, ".dynbss") == 0
704 && addrs_to_abfd_addrs[i - 1] != NULL)
705 || (strcmp (sect_name, ".sbss") == 0
707 && strcmp (addrs->other[i - 1].name, ".sdynbss") == 0
708 && addrs_to_abfd_addrs[i - 1] != NULL)))
709 warning (_("section %s not found in %s"), sect_name,
710 bfd_get_filename (abfd));
712 addrs->other[i].addr = 0;
713 addrs->other[i].sectindex = -1;
717 do_cleanups (my_cleanup);
720 /* Parse the user's idea of an offset for dynamic linking, into our idea
721 of how to represent it for fast symbol reading. This is the default
722 version of the sym_fns.sym_offsets function for symbol readers that
723 don't need to do anything special. It allocates a section_offsets table
724 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
727 default_symfile_offsets (struct objfile *objfile,
728 struct section_addr_info *addrs)
730 objfile->num_sections = bfd_count_sections (objfile->obfd);
731 objfile->section_offsets = (struct section_offsets *)
732 obstack_alloc (&objfile->objfile_obstack,
733 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
734 relative_addr_info_to_section_offsets (objfile->section_offsets,
735 objfile->num_sections, addrs);
737 /* For relocatable files, all loadable sections will start at zero.
738 The zero is meaningless, so try to pick arbitrary addresses such
739 that no loadable sections overlap. This algorithm is quadratic,
740 but the number of sections in a single object file is generally
742 if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0)
744 struct place_section_arg arg;
745 bfd *abfd = objfile->obfd;
748 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
749 /* We do not expect this to happen; just skip this step if the
750 relocatable file has a section with an assigned VMA. */
751 if (bfd_section_vma (abfd, cur_sec) != 0)
756 CORE_ADDR *offsets = objfile->section_offsets->offsets;
758 /* Pick non-overlapping offsets for sections the user did not
760 arg.offsets = objfile->section_offsets;
762 bfd_map_over_sections (objfile->obfd, place_section, &arg);
764 /* Correctly filling in the section offsets is not quite
765 enough. Relocatable files have two properties that
766 (most) shared objects do not:
768 - Their debug information will contain relocations. Some
769 shared libraries do also, but many do not, so this can not
772 - If there are multiple code sections they will be loaded
773 at different relative addresses in memory than they are
774 in the objfile, since all sections in the file will start
777 Because GDB has very limited ability to map from an
778 address in debug info to the correct code section,
779 it relies on adding SECT_OFF_TEXT to things which might be
780 code. If we clear all the section offsets, and set the
781 section VMAs instead, then symfile_relocate_debug_section
782 will return meaningful debug information pointing at the
785 GDB has too many different data structures for section
786 addresses - a bfd, objfile, and so_list all have section
787 tables, as does exec_ops. Some of these could probably
790 for (cur_sec = abfd->sections; cur_sec != NULL;
791 cur_sec = cur_sec->next)
793 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
796 bfd_set_section_vma (abfd, cur_sec, offsets[cur_sec->index]);
797 exec_set_section_address (bfd_get_filename (abfd),
799 offsets[cur_sec->index]);
800 offsets[cur_sec->index] = 0;
805 /* Remember the bfd indexes for the .text, .data, .bss and
807 init_objfile_sect_indices (objfile);
811 /* Divide the file into segments, which are individual relocatable units.
812 This is the default version of the sym_fns.sym_segments function for
813 symbol readers that do not have an explicit representation of segments.
814 It assumes that object files do not have segments, and fully linked
815 files have a single segment. */
817 struct symfile_segment_data *
818 default_symfile_segments (bfd *abfd)
822 struct symfile_segment_data *data;
825 /* Relocatable files contain enough information to position each
826 loadable section independently; they should not be relocated
828 if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0)
831 /* Make sure there is at least one loadable section in the file. */
832 for (sect = abfd->sections; sect != NULL; sect = sect->next)
834 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
842 low = bfd_get_section_vma (abfd, sect);
843 high = low + bfd_get_section_size (sect);
845 data = XZALLOC (struct symfile_segment_data);
846 data->num_segments = 1;
847 data->segment_bases = XCALLOC (1, CORE_ADDR);
848 data->segment_sizes = XCALLOC (1, CORE_ADDR);
850 num_sections = bfd_count_sections (abfd);
851 data->segment_info = XCALLOC (num_sections, int);
853 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
857 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
860 vma = bfd_get_section_vma (abfd, sect);
863 if (vma + bfd_get_section_size (sect) > high)
864 high = vma + bfd_get_section_size (sect);
866 data->segment_info[i] = 1;
869 data->segment_bases[0] = low;
870 data->segment_sizes[0] = high - low;
875 /* This is a convenience function to call sym_read for OBJFILE and
876 possibly force the partial symbols to be read. */
879 read_symbols (struct objfile *objfile, int add_flags)
881 (*objfile->sf->sym_read) (objfile, add_flags);
882 if (!objfile_has_partial_symbols (objfile))
884 bfd *abfd = find_separate_debug_file_in_section (objfile);
885 struct cleanup *cleanup = make_cleanup_bfd_unref (abfd);
888 symbol_file_add_separate (abfd, add_flags, objfile);
890 do_cleanups (cleanup);
892 if ((add_flags & SYMFILE_NO_READ) == 0)
893 require_partial_symbols (objfile, 0);
896 /* Process a symbol file, as either the main file or as a dynamically
899 This function does not set the OBJFILE's entry-point info.
901 OBJFILE is where the symbols are to be read from.
903 ADDRS is the list of section load addresses. If the user has given
904 an 'add-symbol-file' command, then this is the list of offsets and
905 addresses he or she provided as arguments to the command; or, if
906 we're handling a shared library, these are the actual addresses the
907 sections are loaded at, according to the inferior's dynamic linker
908 (as gleaned by GDB's shared library code). We convert each address
909 into an offset from the section VMA's as it appears in the object
910 file, and then call the file's sym_offsets function to convert this
911 into a format-specific offset table --- a `struct section_offsets'.
912 If ADDRS is non-zero, OFFSETS must be zero.
914 OFFSETS is a table of section offsets already in the right
915 format-specific representation. NUM_OFFSETS is the number of
916 elements present in OFFSETS->offsets. If OFFSETS is non-zero, we
917 assume this is the proper table the call to sym_offsets described
918 above would produce. Instead of calling sym_offsets, we just dump
919 it right into objfile->section_offsets. (When we're re-reading
920 symbols from an objfile, we don't have the original load address
921 list any more; all we have is the section offset table.) If
922 OFFSETS is non-zero, ADDRS must be zero.
924 ADD_FLAGS encodes verbosity level, whether this is main symbol or
925 an extra symbol file such as dynamically loaded code, and wether
926 breakpoint reset should be deferred. */
929 syms_from_objfile_1 (struct objfile *objfile,
930 struct section_addr_info *addrs,
931 struct section_offsets *offsets,
935 struct section_addr_info *local_addr = NULL;
936 struct cleanup *old_chain;
937 const int mainline = add_flags & SYMFILE_MAINLINE;
939 gdb_assert (! (addrs && offsets));
941 objfile->sf = find_sym_fns (objfile->obfd);
943 if (objfile->sf == NULL)
945 /* No symbols to load, but we still need to make sure
946 that the section_offsets table is allocated. */
947 int num_sections = bfd_count_sections (objfile->obfd);
948 size_t size = SIZEOF_N_SECTION_OFFSETS (num_offsets);
950 objfile->num_sections = num_sections;
951 objfile->section_offsets
952 = obstack_alloc (&objfile->objfile_obstack, size);
953 memset (objfile->section_offsets, 0, size);
957 /* Make sure that partially constructed symbol tables will be cleaned up
958 if an error occurs during symbol reading. */
959 old_chain = make_cleanup_free_objfile (objfile);
961 /* If ADDRS and OFFSETS are both NULL, put together a dummy address
962 list. We now establish the convention that an addr of zero means
963 no load address was specified. */
964 if (! addrs && ! offsets)
967 = alloc_section_addr_info (bfd_count_sections (objfile->obfd));
968 make_cleanup (xfree, local_addr);
972 /* Now either addrs or offsets is non-zero. */
976 /* We will modify the main symbol table, make sure that all its users
977 will be cleaned up if an error occurs during symbol reading. */
978 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);
980 /* Since no error yet, throw away the old symbol table. */
982 if (symfile_objfile != NULL)
984 free_objfile (symfile_objfile);
985 gdb_assert (symfile_objfile == NULL);
988 /* Currently we keep symbols from the add-symbol-file command.
989 If the user wants to get rid of them, they should do "symbol-file"
990 without arguments first. Not sure this is the best behavior
993 (*objfile->sf->sym_new_init) (objfile);
996 /* Convert addr into an offset rather than an absolute address.
997 We find the lowest address of a loaded segment in the objfile,
998 and assume that <addr> is where that got loaded.
1000 We no longer warn if the lowest section is not a text segment (as
1001 happens for the PA64 port. */
1002 if (addrs && addrs->other[0].name)
1003 addr_info_make_relative (addrs, objfile->obfd);
1005 /* Initialize symbol reading routines for this objfile, allow complaints to
1006 appear for this new file, and record how verbose to be, then do the
1007 initial symbol reading for this file. */
1009 (*objfile->sf->sym_init) (objfile);
1010 clear_complaints (&symfile_complaints, 1, add_flags & SYMFILE_VERBOSE);
1013 (*objfile->sf->sym_offsets) (objfile, addrs);
1016 size_t size = SIZEOF_N_SECTION_OFFSETS (num_offsets);
1018 /* Just copy in the offset table directly as given to us. */
1019 objfile->num_sections = num_offsets;
1020 objfile->section_offsets
1021 = ((struct section_offsets *)
1022 obstack_alloc (&objfile->objfile_obstack, size));
1023 memcpy (objfile->section_offsets, offsets, size);
1025 init_objfile_sect_indices (objfile);
1028 read_symbols (objfile, add_flags);
1030 /* Discard cleanups as symbol reading was successful. */
1032 discard_cleanups (old_chain);
1036 /* Same as syms_from_objfile_1, but also initializes the objfile
1037 entry-point info. */
1040 syms_from_objfile (struct objfile *objfile,
1041 struct section_addr_info *addrs,
1042 struct section_offsets *offsets,
1046 syms_from_objfile_1 (objfile, addrs, offsets, num_offsets, add_flags);
1047 init_entry_point_info (objfile);
1050 /* Perform required actions after either reading in the initial
1051 symbols for a new objfile, or mapping in the symbols from a reusable
1052 objfile. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
1055 new_symfile_objfile (struct objfile *objfile, int add_flags)
1057 /* If this is the main symbol file we have to clean up all users of the
1058 old main symbol file. Otherwise it is sufficient to fixup all the
1059 breakpoints that may have been redefined by this symbol file. */
1060 if (add_flags & SYMFILE_MAINLINE)
1062 /* OK, make it the "real" symbol file. */
1063 symfile_objfile = objfile;
1065 clear_symtab_users (add_flags);
1067 else if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0)
1069 breakpoint_re_set ();
1072 /* We're done reading the symbol file; finish off complaints. */
1073 clear_complaints (&symfile_complaints, 0, add_flags & SYMFILE_VERBOSE);
1076 /* Process a symbol file, as either the main file or as a dynamically
1079 ABFD is a BFD already open on the file, as from symfile_bfd_open.
1080 A new reference is acquired by this function.
1082 ADD_FLAGS encodes verbosity, whether this is main symbol file or
1083 extra, such as dynamically loaded code, and what to do with breakpoins.
1085 ADDRS, OFFSETS, and NUM_OFFSETS are as described for
1086 syms_from_objfile, above.
1087 ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS.
1089 PARENT is the original objfile if ABFD is a separate debug info file.
1090 Otherwise PARENT is NULL.
1092 Upon success, returns a pointer to the objfile that was added.
1093 Upon failure, jumps back to command level (never returns). */
1095 static struct objfile *
1096 symbol_file_add_with_addrs_or_offsets (bfd *abfd,
1098 struct section_addr_info *addrs,
1099 struct section_offsets *offsets,
1101 int flags, struct objfile *parent)
1103 struct objfile *objfile;
1104 const char *name = bfd_get_filename (abfd);
1105 const int from_tty = add_flags & SYMFILE_VERBOSE;
1106 const int mainline = add_flags & SYMFILE_MAINLINE;
1107 const int should_print = ((from_tty || info_verbose)
1108 && (readnow_symbol_files
1109 || (add_flags & SYMFILE_NO_READ) == 0));
1111 if (readnow_symbol_files)
1113 flags |= OBJF_READNOW;
1114 add_flags &= ~SYMFILE_NO_READ;
1117 /* Give user a chance to burp if we'd be
1118 interactively wiping out any existing symbols. */
1120 if ((have_full_symbols () || have_partial_symbols ())
1123 && !query (_("Load new symbol table from \"%s\"? "), name))
1124 error (_("Not confirmed."));
1126 objfile = allocate_objfile (abfd, flags | (mainline ? OBJF_MAINLINE : 0));
1129 add_separate_debug_objfile (objfile, parent);
1131 /* We either created a new mapped symbol table, mapped an existing
1132 symbol table file which has not had initial symbol reading
1133 performed, or need to read an unmapped symbol table. */
1136 if (deprecated_pre_add_symbol_hook)
1137 deprecated_pre_add_symbol_hook (name);
1140 printf_unfiltered (_("Reading symbols from %s..."), name);
1142 gdb_flush (gdb_stdout);
1145 syms_from_objfile (objfile, addrs, offsets, num_offsets,
1148 /* We now have at least a partial symbol table. Check to see if the
1149 user requested that all symbols be read on initial access via either
1150 the gdb startup command line or on a per symbol file basis. Expand
1151 all partial symbol tables for this objfile if so. */
1153 if ((flags & OBJF_READNOW))
1157 printf_unfiltered (_("expanding to full symbols..."));
1159 gdb_flush (gdb_stdout);
1163 objfile->sf->qf->expand_all_symtabs (objfile);
1166 if (should_print && !objfile_has_symbols (objfile))
1169 printf_unfiltered (_("(no debugging symbols found)..."));
1175 if (deprecated_post_add_symbol_hook)
1176 deprecated_post_add_symbol_hook ();
1178 printf_unfiltered (_("done.\n"));
1181 /* We print some messages regardless of whether 'from_tty ||
1182 info_verbose' is true, so make sure they go out at the right
1184 gdb_flush (gdb_stdout);
1186 if (objfile->sf == NULL)
1188 observer_notify_new_objfile (objfile);
1189 return objfile; /* No symbols. */
1192 new_symfile_objfile (objfile, add_flags);
1194 observer_notify_new_objfile (objfile);
1196 bfd_cache_close_all ();
1200 /* Add BFD as a separate debug file for OBJFILE. */
1203 symbol_file_add_separate (bfd *bfd, int symfile_flags, struct objfile *objfile)
1205 struct objfile *new_objfile;
1206 struct section_addr_info *sap;
1207 struct cleanup *my_cleanup;
1209 /* Create section_addr_info. We can't directly use offsets from OBJFILE
1210 because sections of BFD may not match sections of OBJFILE and because
1211 vma may have been modified by tools such as prelink. */
1212 sap = build_section_addr_info_from_objfile (objfile);
1213 my_cleanup = make_cleanup_free_section_addr_info (sap);
1215 new_objfile = symbol_file_add_with_addrs_or_offsets
1216 (bfd, symfile_flags,
1218 objfile->flags & (OBJF_REORDERED | OBJF_SHARED | OBJF_READNOW
1222 do_cleanups (my_cleanup);
1225 /* Process the symbol file ABFD, as either the main file or as a
1226 dynamically loaded file.
1228 See symbol_file_add_with_addrs_or_offsets's comments for
1231 symbol_file_add_from_bfd (bfd *abfd, int add_flags,
1232 struct section_addr_info *addrs,
1233 int flags, struct objfile *parent)
1235 return symbol_file_add_with_addrs_or_offsets (abfd, add_flags, addrs, 0, 0,
1240 /* Process a symbol file, as either the main file or as a dynamically
1241 loaded file. See symbol_file_add_with_addrs_or_offsets's comments
1244 symbol_file_add (char *name, int add_flags, struct section_addr_info *addrs,
1247 bfd *bfd = symfile_bfd_open (name);
1248 struct cleanup *cleanup = make_cleanup_bfd_unref (bfd);
1249 struct objfile *objf;
1251 objf = symbol_file_add_from_bfd (bfd, add_flags, addrs, flags, NULL);
1252 do_cleanups (cleanup);
1257 /* Call symbol_file_add() with default values and update whatever is
1258 affected by the loading of a new main().
1259 Used when the file is supplied in the gdb command line
1260 and by some targets with special loading requirements.
1261 The auxiliary function, symbol_file_add_main_1(), has the flags
1262 argument for the switches that can only be specified in the symbol_file
1266 symbol_file_add_main (char *args, int from_tty)
1268 symbol_file_add_main_1 (args, from_tty, 0);
1272 symbol_file_add_main_1 (char *args, int from_tty, int flags)
1274 const int add_flags = (current_inferior ()->symfile_flags
1275 | SYMFILE_MAINLINE | (from_tty ? SYMFILE_VERBOSE : 0));
1277 symbol_file_add (args, add_flags, NULL, flags);
1279 /* Getting new symbols may change our opinion about
1280 what is frameless. */
1281 reinit_frame_cache ();
1283 if ((flags & SYMFILE_NO_READ) == 0)
1284 set_initial_language ();
1288 symbol_file_clear (int from_tty)
1290 if ((have_full_symbols () || have_partial_symbols ())
1293 ? !query (_("Discard symbol table from `%s'? "),
1294 symfile_objfile->name)
1295 : !query (_("Discard symbol table? "))))
1296 error (_("Not confirmed."));
1298 /* solib descriptors may have handles to objfiles. Wipe them before their
1299 objfiles get stale by free_all_objfiles. */
1300 no_shared_libraries (NULL, from_tty);
1302 free_all_objfiles ();
1304 gdb_assert (symfile_objfile == NULL);
1306 printf_unfiltered (_("No symbol file now.\n"));
1310 get_debug_link_info (struct objfile *objfile, unsigned long *crc32_out)
1313 bfd_size_type debuglink_size;
1314 unsigned long crc32;
1318 sect = bfd_get_section_by_name (objfile->obfd, ".gnu_debuglink");
1323 debuglink_size = bfd_section_size (objfile->obfd, sect);
1325 contents = xmalloc (debuglink_size);
1326 bfd_get_section_contents (objfile->obfd, sect, contents,
1327 (file_ptr)0, (bfd_size_type)debuglink_size);
1329 /* Crc value is stored after the filename, aligned up to 4 bytes. */
1330 crc_offset = strlen (contents) + 1;
1331 crc_offset = (crc_offset + 3) & ~3;
1333 crc32 = bfd_get_32 (objfile->obfd, (bfd_byte *) (contents + crc_offset));
1339 /* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and
1340 return 1. Otherwise print a warning and return 0. ABFD seek position is
1344 get_file_crc (bfd *abfd, unsigned long *file_crc_return)
1346 unsigned long file_crc = 0;
1348 if (bfd_seek (abfd, 0, SEEK_SET) != 0)
1350 warning (_("Problem reading \"%s\" for CRC: %s"),
1351 bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
1357 gdb_byte buffer[8 * 1024];
1358 bfd_size_type count;
1360 count = bfd_bread (buffer, sizeof (buffer), abfd);
1361 if (count == (bfd_size_type) -1)
1363 warning (_("Problem reading \"%s\" for CRC: %s"),
1364 bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
1369 file_crc = gnu_debuglink_crc32 (file_crc, buffer, count);
1372 *file_crc_return = file_crc;
1377 separate_debug_file_exists (const char *name, unsigned long crc,
1378 struct objfile *parent_objfile)
1380 unsigned long file_crc;
1383 struct stat parent_stat, abfd_stat;
1384 int verified_as_different;
1386 /* Find a separate debug info file as if symbols would be present in
1387 PARENT_OBJFILE itself this function would not be called. .gnu_debuglink
1388 section can contain just the basename of PARENT_OBJFILE without any
1389 ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where
1390 the separate debug infos with the same basename can exist. */
1392 if (filename_cmp (name, parent_objfile->name) == 0)
1395 abfd = gdb_bfd_open_maybe_remote (name);
1400 /* Verify symlinks were not the cause of filename_cmp name difference above.
1402 Some operating systems, e.g. Windows, do not provide a meaningful
1403 st_ino; they always set it to zero. (Windows does provide a
1404 meaningful st_dev.) Do not indicate a duplicate library in that
1405 case. While there is no guarantee that a system that provides
1406 meaningful inode numbers will never set st_ino to zero, this is
1407 merely an optimization, so we do not need to worry about false
1410 if (bfd_stat (abfd, &abfd_stat) == 0
1411 && abfd_stat.st_ino != 0
1412 && bfd_stat (parent_objfile->obfd, &parent_stat) == 0)
1414 if (abfd_stat.st_dev == parent_stat.st_dev
1415 && abfd_stat.st_ino == parent_stat.st_ino)
1417 gdb_bfd_unref (abfd);
1420 verified_as_different = 1;
1423 verified_as_different = 0;
1425 file_crc_p = get_file_crc (abfd, &file_crc);
1427 gdb_bfd_unref (abfd);
1432 if (crc != file_crc)
1434 /* If one (or both) the files are accessed for example the via "remote:"
1435 gdbserver way it does not support the bfd_stat operation. Verify
1436 whether those two files are not the same manually. */
1438 if (!verified_as_different && !parent_objfile->crc32_p)
1440 parent_objfile->crc32_p = get_file_crc (parent_objfile->obfd,
1441 &parent_objfile->crc32);
1442 if (!parent_objfile->crc32_p)
1446 if (verified_as_different || parent_objfile->crc32 != file_crc)
1447 warning (_("the debug information found in \"%s\""
1448 " does not match \"%s\" (CRC mismatch).\n"),
1449 name, parent_objfile->name);
1457 char *debug_file_directory = NULL;
1459 show_debug_file_directory (struct ui_file *file, int from_tty,
1460 struct cmd_list_element *c, const char *value)
1462 fprintf_filtered (file,
1463 _("The directory where separate debug "
1464 "symbols are searched for is \"%s\".\n"),
1468 #if ! defined (DEBUG_SUBDIRECTORY)
1469 #define DEBUG_SUBDIRECTORY ".debug"
1472 /* Find a separate debuginfo file for OBJFILE, using DIR as the directory
1473 where the original file resides (may not be the same as
1474 dirname(objfile->name) due to symlinks), and DEBUGLINK as the file we are
1475 looking for. Returns the name of the debuginfo, of NULL. */
1478 find_separate_debug_file (const char *dir,
1479 const char *canon_dir,
1480 const char *debuglink,
1481 unsigned long crc32, struct objfile *objfile)
1486 VEC (char_ptr) *debugdir_vec;
1487 struct cleanup *back_to;
1490 /* Set I to max (strlen (canon_dir), strlen (dir)). */
1492 if (canon_dir != NULL && strlen (canon_dir) > i)
1493 i = strlen (canon_dir);
1495 debugfile = xmalloc (strlen (debug_file_directory) + 1
1497 + strlen (DEBUG_SUBDIRECTORY)
1499 + strlen (debuglink)
1502 /* First try in the same directory as the original file. */
1503 strcpy (debugfile, dir);
1504 strcat (debugfile, debuglink);
1506 if (separate_debug_file_exists (debugfile, crc32, objfile))
1509 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */
1510 strcpy (debugfile, dir);
1511 strcat (debugfile, DEBUG_SUBDIRECTORY);
1512 strcat (debugfile, "/");
1513 strcat (debugfile, debuglink);
1515 if (separate_debug_file_exists (debugfile, crc32, objfile))
1518 /* Then try in the global debugfile directories.
1520 Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
1521 cause "/..." lookups. */
1523 debugdir_vec = dirnames_to_char_ptr_vec (debug_file_directory);
1524 back_to = make_cleanup_free_char_ptr_vec (debugdir_vec);
1526 for (ix = 0; VEC_iterate (char_ptr, debugdir_vec, ix, debugdir); ++ix)
1528 strcpy (debugfile, debugdir);
1529 strcat (debugfile, "/");
1530 strcat (debugfile, dir);
1531 strcat (debugfile, debuglink);
1533 if (separate_debug_file_exists (debugfile, crc32, objfile))
1536 /* If the file is in the sysroot, try using its base path in the
1537 global debugfile directory. */
1538 if (canon_dir != NULL
1539 && filename_ncmp (canon_dir, gdb_sysroot,
1540 strlen (gdb_sysroot)) == 0
1541 && IS_DIR_SEPARATOR (canon_dir[strlen (gdb_sysroot)]))
1543 strcpy (debugfile, debugdir);
1544 strcat (debugfile, canon_dir + strlen (gdb_sysroot));
1545 strcat (debugfile, "/");
1546 strcat (debugfile, debuglink);
1548 if (separate_debug_file_exists (debugfile, crc32, objfile))
1553 do_cleanups (back_to);
1558 /* Modify PATH to contain only "directory/" part of PATH.
1559 If there were no directory separators in PATH, PATH will be empty
1560 string on return. */
1563 terminate_after_last_dir_separator (char *path)
1567 /* Strip off the final filename part, leaving the directory name,
1568 followed by a slash. The directory can be relative or absolute. */
1569 for (i = strlen(path) - 1; i >= 0; i--)
1570 if (IS_DIR_SEPARATOR (path[i]))
1573 /* If I is -1 then no directory is present there and DIR will be "". */
1577 /* Find separate debuginfo for OBJFILE (using .gnu_debuglink section).
1578 Returns pathname, or NULL. */
1581 find_separate_debug_file_by_debuglink (struct objfile *objfile)
1584 char *dir, *canon_dir;
1586 unsigned long crc32;
1587 struct cleanup *cleanups;
1589 debuglink = get_debug_link_info (objfile, &crc32);
1591 if (debuglink == NULL)
1593 /* There's no separate debug info, hence there's no way we could
1594 load it => no warning. */
1598 cleanups = make_cleanup (xfree, debuglink);
1599 dir = xstrdup (objfile->name);
1600 make_cleanup (xfree, dir);
1601 terminate_after_last_dir_separator (dir);
1602 canon_dir = lrealpath (dir);
1604 debugfile = find_separate_debug_file (dir, canon_dir, debuglink,
1608 if (debugfile == NULL)
1611 /* For PR gdb/9538, try again with realpath (if different from the
1616 if (lstat (objfile->name, &st_buf) == 0 && S_ISLNK(st_buf.st_mode))
1620 symlink_dir = lrealpath (objfile->name);
1621 if (symlink_dir != NULL)
1623 make_cleanup (xfree, symlink_dir);
1624 terminate_after_last_dir_separator (symlink_dir);
1625 if (strcmp (dir, symlink_dir) != 0)
1627 /* Different directory, so try using it. */
1628 debugfile = find_separate_debug_file (symlink_dir,
1636 #endif /* HAVE_LSTAT */
1639 do_cleanups (cleanups);
1644 /* This is the symbol-file command. Read the file, analyze its
1645 symbols, and add a struct symtab to a symtab list. The syntax of
1646 the command is rather bizarre:
1648 1. The function buildargv implements various quoting conventions
1649 which are undocumented and have little or nothing in common with
1650 the way things are quoted (or not quoted) elsewhere in GDB.
1652 2. Options are used, which are not generally used in GDB (perhaps
1653 "set mapped on", "set readnow on" would be better)
1655 3. The order of options matters, which is contrary to GNU
1656 conventions (because it is confusing and inconvenient). */
1659 symbol_file_command (char *args, int from_tty)
1665 symbol_file_clear (from_tty);
1669 char **argv = gdb_buildargv (args);
1670 int flags = OBJF_USERLOADED;
1671 struct cleanup *cleanups;
1674 cleanups = make_cleanup_freeargv (argv);
1675 while (*argv != NULL)
1677 if (strcmp (*argv, "-readnow") == 0)
1678 flags |= OBJF_READNOW;
1679 else if (**argv == '-')
1680 error (_("unknown option `%s'"), *argv);
1683 symbol_file_add_main_1 (*argv, from_tty, flags);
1691 error (_("no symbol file name was specified"));
1693 do_cleanups (cleanups);
1697 /* Set the initial language.
1699 FIXME: A better solution would be to record the language in the
1700 psymtab when reading partial symbols, and then use it (if known) to
1701 set the language. This would be a win for formats that encode the
1702 language in an easily discoverable place, such as DWARF. For
1703 stabs, we can jump through hoops looking for specially named
1704 symbols or try to intuit the language from the specific type of
1705 stabs we find, but we can't do that until later when we read in
1709 set_initial_language (void)
1711 enum language lang = language_unknown;
1713 if (language_of_main != language_unknown)
1714 lang = language_of_main;
1717 const char *filename;
1719 filename = find_main_filename ();
1720 if (filename != NULL)
1721 lang = deduce_language_from_filename (filename);
1724 if (lang == language_unknown)
1726 /* Make C the default language */
1730 set_language (lang);
1731 expected_language = current_language; /* Don't warn the user. */
1734 /* If NAME is a remote name open the file using remote protocol, otherwise
1735 open it normally. Returns a new reference to the BFD. On error,
1736 returns NULL with the BFD error set. */
1739 gdb_bfd_open_maybe_remote (const char *name)
1743 if (remote_filename_p (name))
1744 result = remote_bfd_open (name, gnutarget);
1746 result = gdb_bfd_open (name, gnutarget, -1);
1752 /* Open the file specified by NAME and hand it off to BFD for
1753 preliminary analysis. Return a newly initialized bfd *, which
1754 includes a newly malloc'd` copy of NAME (tilde-expanded and made
1755 absolute). In case of trouble, error() is called. */
1758 symfile_bfd_open (char *name)
1762 char *absolute_name;
1764 if (remote_filename_p (name))
1766 sym_bfd = remote_bfd_open (name, gnutarget);
1768 error (_("`%s': can't open to read symbols: %s."), name,
1769 bfd_errmsg (bfd_get_error ()));
1771 if (!bfd_check_format (sym_bfd, bfd_object))
1773 make_cleanup_bfd_unref (sym_bfd);
1774 error (_("`%s': can't read symbols: %s."), name,
1775 bfd_errmsg (bfd_get_error ()));
1781 name = tilde_expand (name); /* Returns 1st new malloc'd copy. */
1783 /* Look down path for it, allocate 2nd new malloc'd copy. */
1784 desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, name,
1785 O_RDONLY | O_BINARY, &absolute_name);
1786 #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__)
1789 char *exename = alloca (strlen (name) + 5);
1791 strcat (strcpy (exename, name), ".exe");
1792 desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename,
1793 O_RDONLY | O_BINARY, &absolute_name);
1798 make_cleanup (xfree, name);
1799 perror_with_name (name);
1803 name = absolute_name;
1804 make_cleanup (xfree, name);
1806 sym_bfd = gdb_bfd_open (name, gnutarget, desc);
1809 make_cleanup (xfree, name);
1810 error (_("`%s': can't open to read symbols: %s."), name,
1811 bfd_errmsg (bfd_get_error ()));
1813 bfd_set_cacheable (sym_bfd, 1);
1815 if (!bfd_check_format (sym_bfd, bfd_object))
1817 make_cleanup_bfd_unref (sym_bfd);
1818 error (_("`%s': can't read symbols: %s."), name,
1819 bfd_errmsg (bfd_get_error ()));
1825 /* Return the section index for SECTION_NAME on OBJFILE. Return -1 if
1826 the section was not found. */
1829 get_section_index (struct objfile *objfile, char *section_name)
1831 asection *sect = bfd_get_section_by_name (objfile->obfd, section_name);
1839 /* Link SF into the global symtab_fns list. Called on startup by the
1840 _initialize routine in each object file format reader, to register
1841 information about each format the reader is prepared to handle. */
1844 add_symtab_fns (const struct sym_fns *sf)
1846 VEC_safe_push (sym_fns_ptr, symtab_fns, sf);
1849 /* Initialize OBJFILE to read symbols from its associated BFD. It
1850 either returns or calls error(). The result is an initialized
1851 struct sym_fns in the objfile structure, that contains cached
1852 information about the symbol file. */
1854 static const struct sym_fns *
1855 find_sym_fns (bfd *abfd)
1857 const struct sym_fns *sf;
1858 enum bfd_flavour our_flavour = bfd_get_flavour (abfd);
1861 if (our_flavour == bfd_target_srec_flavour
1862 || our_flavour == bfd_target_ihex_flavour
1863 || our_flavour == bfd_target_tekhex_flavour)
1864 return NULL; /* No symbols. */
1866 for (i = 0; VEC_iterate (sym_fns_ptr, symtab_fns, i, sf); ++i)
1867 if (our_flavour == sf->sym_flavour)
1870 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."),
1871 bfd_get_target (abfd));
1875 /* This function runs the load command of our current target. */
1878 load_command (char *arg, int from_tty)
1882 /* The user might be reloading because the binary has changed. Take
1883 this opportunity to check. */
1884 reopen_exec_file ();
1892 parg = arg = get_exec_file (1);
1894 /* Count how many \ " ' tab space there are in the name. */
1895 while ((parg = strpbrk (parg, "\\\"'\t ")))
1903 /* We need to quote this string so buildargv can pull it apart. */
1904 char *temp = xmalloc (strlen (arg) + count + 1 );
1908 make_cleanup (xfree, temp);
1911 while ((parg = strpbrk (parg, "\\\"'\t ")))
1913 strncpy (ptemp, prev, parg - prev);
1914 ptemp += parg - prev;
1918 strcpy (ptemp, prev);
1924 target_load (arg, from_tty);
1926 /* After re-loading the executable, we don't really know which
1927 overlays are mapped any more. */
1928 overlay_cache_invalid = 1;
1931 /* This version of "load" should be usable for any target. Currently
1932 it is just used for remote targets, not inftarg.c or core files,
1933 on the theory that only in that case is it useful.
1935 Avoiding xmodem and the like seems like a win (a) because we don't have
1936 to worry about finding it, and (b) On VMS, fork() is very slow and so
1937 we don't want to run a subprocess. On the other hand, I'm not sure how
1938 performance compares. */
1940 static int validate_download = 0;
1942 /* Callback service function for generic_load (bfd_map_over_sections). */
1945 add_section_size_callback (bfd *abfd, asection *asec, void *data)
1947 bfd_size_type *sum = data;
1949 *sum += bfd_get_section_size (asec);
1952 /* Opaque data for load_section_callback. */
1953 struct load_section_data {
1954 unsigned long load_offset;
1955 struct load_progress_data *progress_data;
1956 VEC(memory_write_request_s) *requests;
1959 /* Opaque data for load_progress. */
1960 struct load_progress_data {
1961 /* Cumulative data. */
1962 unsigned long write_count;
1963 unsigned long data_count;
1964 bfd_size_type total_size;
1967 /* Opaque data for load_progress for a single section. */
1968 struct load_progress_section_data {
1969 struct load_progress_data *cumulative;
1971 /* Per-section data. */
1972 const char *section_name;
1973 ULONGEST section_sent;
1974 ULONGEST section_size;
1979 /* Target write callback routine for progress reporting. */
1982 load_progress (ULONGEST bytes, void *untyped_arg)
1984 struct load_progress_section_data *args = untyped_arg;
1985 struct load_progress_data *totals;
1988 /* Writing padding data. No easy way to get at the cumulative
1989 stats, so just ignore this. */
1992 totals = args->cumulative;
1994 if (bytes == 0 && args->section_sent == 0)
1996 /* The write is just starting. Let the user know we've started
1998 ui_out_message (current_uiout, 0, "Loading section %s, size %s lma %s\n",
1999 args->section_name, hex_string (args->section_size),
2000 paddress (target_gdbarch (), args->lma));
2004 if (validate_download)
2006 /* Broken memories and broken monitors manifest themselves here
2007 when bring new computers to life. This doubles already slow
2009 /* NOTE: cagney/1999-10-18: A more efficient implementation
2010 might add a verify_memory() method to the target vector and
2011 then use that. remote.c could implement that method using
2012 the ``qCRC'' packet. */
2013 gdb_byte *check = xmalloc (bytes);
2014 struct cleanup *verify_cleanups = make_cleanup (xfree, check);
2016 if (target_read_memory (args->lma, check, bytes) != 0)
2017 error (_("Download verify read failed at %s"),
2018 paddress (target_gdbarch (), args->lma));
2019 if (memcmp (args->buffer, check, bytes) != 0)
2020 error (_("Download verify compare failed at %s"),
2021 paddress (target_gdbarch (), args->lma));
2022 do_cleanups (verify_cleanups);
2024 totals->data_count += bytes;
2026 args->buffer += bytes;
2027 totals->write_count += 1;
2028 args->section_sent += bytes;
2029 if (check_quit_flag ()
2030 || (deprecated_ui_load_progress_hook != NULL
2031 && deprecated_ui_load_progress_hook (args->section_name,
2032 args->section_sent)))
2033 error (_("Canceled the download"));
2035 if (deprecated_show_load_progress != NULL)
2036 deprecated_show_load_progress (args->section_name,
2040 totals->total_size);
2043 /* Callback service function for generic_load (bfd_map_over_sections). */
2046 load_section_callback (bfd *abfd, asection *asec, void *data)
2048 struct memory_write_request *new_request;
2049 struct load_section_data *args = data;
2050 struct load_progress_section_data *section_data;
2051 bfd_size_type size = bfd_get_section_size (asec);
2053 const char *sect_name = bfd_get_section_name (abfd, asec);
2055 if ((bfd_get_section_flags (abfd, asec) & SEC_LOAD) == 0)
2061 new_request = VEC_safe_push (memory_write_request_s,
2062 args->requests, NULL);
2063 memset (new_request, 0, sizeof (struct memory_write_request));
2064 section_data = xcalloc (1, sizeof (struct load_progress_section_data));
2065 new_request->begin = bfd_section_lma (abfd, asec) + args->load_offset;
2066 new_request->end = new_request->begin + size; /* FIXME Should size
2068 new_request->data = xmalloc (size);
2069 new_request->baton = section_data;
2071 buffer = new_request->data;
2073 section_data->cumulative = args->progress_data;
2074 section_data->section_name = sect_name;
2075 section_data->section_size = size;
2076 section_data->lma = new_request->begin;
2077 section_data->buffer = buffer;
2079 bfd_get_section_contents (abfd, asec, buffer, 0, size);
2082 /* Clean up an entire memory request vector, including load
2083 data and progress records. */
2086 clear_memory_write_data (void *arg)
2088 VEC(memory_write_request_s) **vec_p = arg;
2089 VEC(memory_write_request_s) *vec = *vec_p;
2091 struct memory_write_request *mr;
2093 for (i = 0; VEC_iterate (memory_write_request_s, vec, i, mr); ++i)
2098 VEC_free (memory_write_request_s, vec);
2102 generic_load (char *args, int from_tty)
2105 struct timeval start_time, end_time;
2107 struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0);
2108 struct load_section_data cbdata;
2109 struct load_progress_data total_progress;
2110 struct ui_out *uiout = current_uiout;
2115 memset (&cbdata, 0, sizeof (cbdata));
2116 memset (&total_progress, 0, sizeof (total_progress));
2117 cbdata.progress_data = &total_progress;
2119 make_cleanup (clear_memory_write_data, &cbdata.requests);
2122 error_no_arg (_("file to load"));
2124 argv = gdb_buildargv (args);
2125 make_cleanup_freeargv (argv);
2127 filename = tilde_expand (argv[0]);
2128 make_cleanup (xfree, filename);
2130 if (argv[1] != NULL)
2134 cbdata.load_offset = strtoul (argv[1], &endptr, 0);
2136 /* If the last word was not a valid number then
2137 treat it as a file name with spaces in. */
2138 if (argv[1] == endptr)
2139 error (_("Invalid download offset:%s."), argv[1]);
2141 if (argv[2] != NULL)
2142 error (_("Too many parameters."));
2145 /* Open the file for loading. */
2146 loadfile_bfd = gdb_bfd_open (filename, gnutarget, -1);
2147 if (loadfile_bfd == NULL)
2149 perror_with_name (filename);
2153 make_cleanup_bfd_unref (loadfile_bfd);
2155 if (!bfd_check_format (loadfile_bfd, bfd_object))
2157 error (_("\"%s\" is not an object file: %s"), filename,
2158 bfd_errmsg (bfd_get_error ()));
2161 bfd_map_over_sections (loadfile_bfd, add_section_size_callback,
2162 (void *) &total_progress.total_size);
2164 bfd_map_over_sections (loadfile_bfd, load_section_callback, &cbdata);
2166 gettimeofday (&start_time, NULL);
2168 if (target_write_memory_blocks (cbdata.requests, flash_discard,
2169 load_progress) != 0)
2170 error (_("Load failed"));
2172 gettimeofday (&end_time, NULL);
2174 entry = bfd_get_start_address (loadfile_bfd);
2175 entry = gdbarch_addr_bits_remove (target_gdbarch (), entry);
2176 ui_out_text (uiout, "Start address ");
2177 ui_out_field_fmt (uiout, "address", "%s", paddress (target_gdbarch (), entry));
2178 ui_out_text (uiout, ", load size ");
2179 ui_out_field_fmt (uiout, "load-size", "%lu", total_progress.data_count);
2180 ui_out_text (uiout, "\n");
2181 /* We were doing this in remote-mips.c, I suspect it is right
2182 for other targets too. */
2183 regcache_write_pc (get_current_regcache (), entry);
2185 /* Reset breakpoints, now that we have changed the load image. For
2186 instance, breakpoints may have been set (or reset, by
2187 post_create_inferior) while connected to the target but before we
2188 loaded the program. In that case, the prologue analyzer could
2189 have read instructions from the target to find the right
2190 breakpoint locations. Loading has changed the contents of that
2193 breakpoint_re_set ();
2195 /* FIXME: are we supposed to call symbol_file_add or not? According
2196 to a comment from remote-mips.c (where a call to symbol_file_add
2197 was commented out), making the call confuses GDB if more than one
2198 file is loaded in. Some targets do (e.g., remote-vx.c) but
2199 others don't (or didn't - perhaps they have all been deleted). */
2201 print_transfer_performance (gdb_stdout, total_progress.data_count,
2202 total_progress.write_count,
2203 &start_time, &end_time);
2205 do_cleanups (old_cleanups);
2208 /* Report how fast the transfer went. */
2211 print_transfer_performance (struct ui_file *stream,
2212 unsigned long data_count,
2213 unsigned long write_count,
2214 const struct timeval *start_time,
2215 const struct timeval *end_time)
2217 ULONGEST time_count;
2218 struct ui_out *uiout = current_uiout;
2220 /* Compute the elapsed time in milliseconds, as a tradeoff between
2221 accuracy and overflow. */
2222 time_count = (end_time->tv_sec - start_time->tv_sec) * 1000;
2223 time_count += (end_time->tv_usec - start_time->tv_usec) / 1000;
2225 ui_out_text (uiout, "Transfer rate: ");
2228 unsigned long rate = ((ULONGEST) data_count * 1000) / time_count;
2230 if (ui_out_is_mi_like_p (uiout))
2232 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate * 8);
2233 ui_out_text (uiout, " bits/sec");
2235 else if (rate < 1024)
2237 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate);
2238 ui_out_text (uiout, " bytes/sec");
2242 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate / 1024);
2243 ui_out_text (uiout, " KB/sec");
2248 ui_out_field_fmt (uiout, "transferred-bits", "%lu", (data_count * 8));
2249 ui_out_text (uiout, " bits in <1 sec");
2251 if (write_count > 0)
2253 ui_out_text (uiout, ", ");
2254 ui_out_field_fmt (uiout, "write-rate", "%lu", data_count / write_count);
2255 ui_out_text (uiout, " bytes/write");
2257 ui_out_text (uiout, ".\n");
2260 /* This function allows the addition of incrementally linked object files.
2261 It does not modify any state in the target, only in the debugger. */
2262 /* Note: ezannoni 2000-04-13 This function/command used to have a
2263 special case syntax for the rombug target (Rombug is the boot
2264 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the
2265 rombug case, the user doesn't need to supply a text address,
2266 instead a call to target_link() (in target.c) would supply the
2267 value to use. We are now discontinuing this type of ad hoc syntax. */
2270 add_symbol_file_command (char *args, int from_tty)
2272 struct gdbarch *gdbarch = get_current_arch ();
2273 char *filename = NULL;
2274 int flags = OBJF_USERLOADED;
2276 int section_index = 0;
2280 int expecting_sec_name = 0;
2281 int expecting_sec_addr = 0;
2290 struct section_addr_info *section_addrs;
2291 struct sect_opt *sect_opts = NULL;
2292 size_t num_sect_opts = 0;
2293 struct cleanup *my_cleanups = make_cleanup (null_cleanup, NULL);
2296 sect_opts = (struct sect_opt *) xmalloc (num_sect_opts
2297 * sizeof (struct sect_opt));
2302 error (_("add-symbol-file takes a file name and an address"));
2304 argv = gdb_buildargv (args);
2305 make_cleanup_freeargv (argv);
2307 for (arg = argv[0], argcnt = 0; arg != NULL; arg = argv[++argcnt])
2309 /* Process the argument. */
2312 /* The first argument is the file name. */
2313 filename = tilde_expand (arg);
2314 make_cleanup (xfree, filename);
2319 /* The second argument is always the text address at which
2320 to load the program. */
2321 sect_opts[section_index].name = ".text";
2322 sect_opts[section_index].value = arg;
2323 if (++section_index >= num_sect_opts)
2326 sect_opts = ((struct sect_opt *)
2327 xrealloc (sect_opts,
2329 * sizeof (struct sect_opt)));
2334 /* It's an option (starting with '-') or it's an argument
2339 if (strcmp (arg, "-readnow") == 0)
2340 flags |= OBJF_READNOW;
2341 else if (strcmp (arg, "-s") == 0)
2343 expecting_sec_name = 1;
2344 expecting_sec_addr = 1;
2349 if (expecting_sec_name)
2351 sect_opts[section_index].name = arg;
2352 expecting_sec_name = 0;
2355 if (expecting_sec_addr)
2357 sect_opts[section_index].value = arg;
2358 expecting_sec_addr = 0;
2359 if (++section_index >= num_sect_opts)
2362 sect_opts = ((struct sect_opt *)
2363 xrealloc (sect_opts,
2365 * sizeof (struct sect_opt)));
2369 error (_("USAGE: add-symbol-file <filename> <textaddress>"
2370 " [-readnow] [-s <secname> <addr>]*"));
2375 /* This command takes at least two arguments. The first one is a
2376 filename, and the second is the address where this file has been
2377 loaded. Abort now if this address hasn't been provided by the
2379 if (section_index < 1)
2380 error (_("The address where %s has been loaded is missing"), filename);
2382 /* Print the prompt for the query below. And save the arguments into
2383 a sect_addr_info structure to be passed around to other
2384 functions. We have to split this up into separate print
2385 statements because hex_string returns a local static
2388 printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename);
2389 section_addrs = alloc_section_addr_info (section_index);
2390 make_cleanup (xfree, section_addrs);
2391 for (i = 0; i < section_index; i++)
2394 char *val = sect_opts[i].value;
2395 char *sec = sect_opts[i].name;
2397 addr = parse_and_eval_address (val);
2399 /* Here we store the section offsets in the order they were
2400 entered on the command line. */
2401 section_addrs->other[sec_num].name = sec;
2402 section_addrs->other[sec_num].addr = addr;
2403 printf_unfiltered ("\t%s_addr = %s\n", sec,
2404 paddress (gdbarch, addr));
2407 /* The object's sections are initialized when a
2408 call is made to build_objfile_section_table (objfile).
2409 This happens in reread_symbols.
2410 At this point, we don't know what file type this is,
2411 so we can't determine what section names are valid. */
2414 if (from_tty && (!query ("%s", "")))
2415 error (_("Not confirmed."));
2417 symbol_file_add (filename, from_tty ? SYMFILE_VERBOSE : 0,
2418 section_addrs, flags);
2420 /* Getting new symbols may change our opinion about what is
2422 reinit_frame_cache ();
2423 do_cleanups (my_cleanups);
2427 typedef struct objfile *objfilep;
2429 DEF_VEC_P (objfilep);
2431 /* Re-read symbols if a symbol-file has changed. */
2433 reread_symbols (void)
2435 struct objfile *objfile;
2437 struct stat new_statbuf;
2439 VEC (objfilep) *new_objfiles = NULL;
2440 struct cleanup *all_cleanups;
2442 all_cleanups = make_cleanup (VEC_cleanup (objfilep), &new_objfiles);
2444 /* With the addition of shared libraries, this should be modified,
2445 the load time should be saved in the partial symbol tables, since
2446 different tables may come from different source files. FIXME.
2447 This routine should then walk down each partial symbol table
2448 and see if the symbol table that it originates from has been changed. */
2450 for (objfile = object_files; objfile; objfile = objfile->next)
2452 /* solib-sunos.c creates one objfile with obfd. */
2453 if (objfile->obfd == NULL)
2456 /* Separate debug objfiles are handled in the main objfile. */
2457 if (objfile->separate_debug_objfile_backlink)
2460 /* If this object is from an archive (what you usually create with
2461 `ar', often called a `static library' on most systems, though
2462 a `shared library' on AIX is also an archive), then you should
2463 stat on the archive name, not member name. */
2464 if (objfile->obfd->my_archive)
2465 res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
2467 res = stat (objfile->name, &new_statbuf);
2470 /* FIXME, should use print_sys_errmsg but it's not filtered. */
2471 printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"),
2475 new_modtime = new_statbuf.st_mtime;
2476 if (new_modtime != objfile->mtime)
2478 struct cleanup *old_cleanups;
2479 struct section_offsets *offsets;
2481 char *obfd_filename;
2483 printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"),
2486 /* There are various functions like symbol_file_add,
2487 symfile_bfd_open, syms_from_objfile, etc., which might
2488 appear to do what we want. But they have various other
2489 effects which we *don't* want. So we just do stuff
2490 ourselves. We don't worry about mapped files (for one thing,
2491 any mapped file will be out of date). */
2493 /* If we get an error, blow away this objfile (not sure if
2494 that is the correct response for things like shared
2496 old_cleanups = make_cleanup_free_objfile (objfile);
2497 /* We need to do this whenever any symbols go away. */
2498 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);
2500 if (exec_bfd != NULL
2501 && filename_cmp (bfd_get_filename (objfile->obfd),
2502 bfd_get_filename (exec_bfd)) == 0)
2504 /* Reload EXEC_BFD without asking anything. */
2506 exec_file_attach (bfd_get_filename (objfile->obfd), 0);
2509 /* Keep the calls order approx. the same as in free_objfile. */
2511 /* Free the separate debug objfiles. It will be
2512 automatically recreated by sym_read. */
2513 free_objfile_separate_debug (objfile);
2515 /* Remove any references to this objfile in the global
2517 preserve_values (objfile);
2519 /* Nuke all the state that we will re-read. Much of the following
2520 code which sets things to NULL really is necessary to tell
2521 other parts of GDB that there is nothing currently there.
2523 Try to keep the freeing order compatible with free_objfile. */
2525 if (objfile->sf != NULL)
2527 (*objfile->sf->sym_finish) (objfile);
2530 clear_objfile_data (objfile);
2532 /* Clean up any state BFD has sitting around. */
2534 struct bfd *obfd = objfile->obfd;
2536 obfd_filename = bfd_get_filename (objfile->obfd);
2537 /* Open the new BFD before freeing the old one, so that
2538 the filename remains live. */
2539 objfile->obfd = gdb_bfd_open_maybe_remote (obfd_filename);
2540 if (objfile->obfd == NULL)
2542 /* We have to make a cleanup and error here, rather
2543 than erroring later, because once we unref OBFD,
2544 OBFD_FILENAME will be freed. */
2545 make_cleanup_bfd_unref (obfd);
2546 error (_("Can't open %s to read symbols."), obfd_filename);
2548 gdb_bfd_unref (obfd);
2551 objfile->name = bfd_get_filename (objfile->obfd);
2552 /* bfd_openr sets cacheable to true, which is what we want. */
2553 if (!bfd_check_format (objfile->obfd, bfd_object))
2554 error (_("Can't read symbols from %s: %s."), objfile->name,
2555 bfd_errmsg (bfd_get_error ()));
2557 /* Save the offsets, we will nuke them with the rest of the
2559 num_offsets = objfile->num_sections;
2560 offsets = ((struct section_offsets *)
2561 alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets)));
2562 memcpy (offsets, objfile->section_offsets,
2563 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2565 /* FIXME: Do we have to free a whole linked list, or is this
2567 if (objfile->global_psymbols.list)
2568 xfree (objfile->global_psymbols.list);
2569 memset (&objfile->global_psymbols, 0,
2570 sizeof (objfile->global_psymbols));
2571 if (objfile->static_psymbols.list)
2572 xfree (objfile->static_psymbols.list);
2573 memset (&objfile->static_psymbols, 0,
2574 sizeof (objfile->static_psymbols));
2576 /* Free the obstacks for non-reusable objfiles. */
2577 psymbol_bcache_free (objfile->psymbol_cache);
2578 objfile->psymbol_cache = psymbol_bcache_init ();
2579 if (objfile->demangled_names_hash != NULL)
2581 htab_delete (objfile->demangled_names_hash);
2582 objfile->demangled_names_hash = NULL;
2584 obstack_free (&objfile->objfile_obstack, 0);
2585 objfile->sections = NULL;
2586 objfile->symtabs = NULL;
2587 objfile->psymtabs = NULL;
2588 objfile->psymtabs_addrmap = NULL;
2589 objfile->free_psymtabs = NULL;
2590 objfile->template_symbols = NULL;
2591 objfile->msymbols = NULL;
2592 objfile->minimal_symbol_count = 0;
2593 memset (&objfile->msymbol_hash, 0,
2594 sizeof (objfile->msymbol_hash));
2595 memset (&objfile->msymbol_demangled_hash, 0,
2596 sizeof (objfile->msymbol_demangled_hash));
2598 set_objfile_per_bfd (objfile);
2600 /* obstack_init also initializes the obstack so it is
2601 empty. We could use obstack_specify_allocation but
2602 gdb_obstack.h specifies the alloc/dealloc functions. */
2603 obstack_init (&objfile->objfile_obstack);
2604 build_objfile_section_table (objfile);
2605 terminate_minimal_symbol_table (objfile);
2607 /* We use the same section offsets as from last time. I'm not
2608 sure whether that is always correct for shared libraries. */
2609 objfile->section_offsets = (struct section_offsets *)
2610 obstack_alloc (&objfile->objfile_obstack,
2611 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2612 memcpy (objfile->section_offsets, offsets,
2613 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2614 objfile->num_sections = num_offsets;
2616 /* What the hell is sym_new_init for, anyway? The concept of
2617 distinguishing between the main file and additional files
2618 in this way seems rather dubious. */
2619 if (objfile == symfile_objfile)
2621 (*objfile->sf->sym_new_init) (objfile);
2624 (*objfile->sf->sym_init) (objfile);
2625 clear_complaints (&symfile_complaints, 1, 1);
2627 objfile->flags &= ~OBJF_PSYMTABS_READ;
2628 read_symbols (objfile, 0);
2630 if (!objfile_has_symbols (objfile))
2633 printf_unfiltered (_("(no debugging symbols found)\n"));
2637 /* We're done reading the symbol file; finish off complaints. */
2638 clear_complaints (&symfile_complaints, 0, 1);
2640 /* Getting new symbols may change our opinion about what is
2643 reinit_frame_cache ();
2645 /* Discard cleanups as symbol reading was successful. */
2646 discard_cleanups (old_cleanups);
2648 /* If the mtime has changed between the time we set new_modtime
2649 and now, we *want* this to be out of date, so don't call stat
2651 objfile->mtime = new_modtime;
2652 init_entry_point_info (objfile);
2654 VEC_safe_push (objfilep, new_objfiles, objfile);
2662 /* Notify objfiles that we've modified objfile sections. */
2663 objfiles_changed ();
2665 clear_symtab_users (0);
2667 /* clear_objfile_data for each objfile was called before freeing it and
2668 observer_notify_new_objfile (NULL) has been called by
2669 clear_symtab_users above. Notify the new files now. */
2670 for (ix = 0; VEC_iterate (objfilep, new_objfiles, ix, objfile); ix++)
2671 observer_notify_new_objfile (objfile);
2673 /* At least one objfile has changed, so we can consider that
2674 the executable we're debugging has changed too. */
2675 observer_notify_executable_changed ();
2678 do_cleanups (all_cleanups);
2690 static filename_language *filename_language_table;
2691 static int fl_table_size, fl_table_next;
2694 add_filename_language (char *ext, enum language lang)
2696 if (fl_table_next >= fl_table_size)
2698 fl_table_size += 10;
2699 filename_language_table =
2700 xrealloc (filename_language_table,
2701 fl_table_size * sizeof (*filename_language_table));
2704 filename_language_table[fl_table_next].ext = xstrdup (ext);
2705 filename_language_table[fl_table_next].lang = lang;
2709 static char *ext_args;
2711 show_ext_args (struct ui_file *file, int from_tty,
2712 struct cmd_list_element *c, const char *value)
2714 fprintf_filtered (file,
2715 _("Mapping between filename extension "
2716 "and source language is \"%s\".\n"),
2721 set_ext_lang_command (char *args, int from_tty, struct cmd_list_element *e)
2724 char *cp = ext_args;
2727 /* First arg is filename extension, starting with '.' */
2729 error (_("'%s': Filename extension must begin with '.'"), ext_args);
2731 /* Find end of first arg. */
2732 while (*cp && !isspace (*cp))
2736 error (_("'%s': two arguments required -- "
2737 "filename extension and language"),
2740 /* Null-terminate first arg. */
2743 /* Find beginning of second arg, which should be a source language. */
2744 while (*cp && isspace (*cp))
2748 error (_("'%s': two arguments required -- "
2749 "filename extension and language"),
2752 /* Lookup the language from among those we know. */
2753 lang = language_enum (cp);
2755 /* Now lookup the filename extension: do we already know it? */
2756 for (i = 0; i < fl_table_next; i++)
2757 if (0 == strcmp (ext_args, filename_language_table[i].ext))
2760 if (i >= fl_table_next)
2762 /* New file extension. */
2763 add_filename_language (ext_args, lang);
2767 /* Redefining a previously known filename extension. */
2770 /* query ("Really make files of type %s '%s'?", */
2771 /* ext_args, language_str (lang)); */
2773 xfree (filename_language_table[i].ext);
2774 filename_language_table[i].ext = xstrdup (ext_args);
2775 filename_language_table[i].lang = lang;
2780 info_ext_lang_command (char *args, int from_tty)
2784 printf_filtered (_("Filename extensions and the languages they represent:"));
2785 printf_filtered ("\n\n");
2786 for (i = 0; i < fl_table_next; i++)
2787 printf_filtered ("\t%s\t- %s\n",
2788 filename_language_table[i].ext,
2789 language_str (filename_language_table[i].lang));
2793 init_filename_language_table (void)
2795 if (fl_table_size == 0) /* Protect against repetition. */
2799 filename_language_table =
2800 xmalloc (fl_table_size * sizeof (*filename_language_table));
2801 add_filename_language (".c", language_c);
2802 add_filename_language (".d", language_d);
2803 add_filename_language (".C", language_cplus);
2804 add_filename_language (".cc", language_cplus);
2805 add_filename_language (".cp", language_cplus);
2806 add_filename_language (".cpp", language_cplus);
2807 add_filename_language (".cxx", language_cplus);
2808 add_filename_language (".c++", language_cplus);
2809 add_filename_language (".java", language_java);
2810 add_filename_language (".class", language_java);
2811 add_filename_language (".m", language_objc);
2812 add_filename_language (".f", language_fortran);
2813 add_filename_language (".F", language_fortran);
2814 add_filename_language (".for", language_fortran);
2815 add_filename_language (".FOR", language_fortran);
2816 add_filename_language (".ftn", language_fortran);
2817 add_filename_language (".FTN", language_fortran);
2818 add_filename_language (".fpp", language_fortran);
2819 add_filename_language (".FPP", language_fortran);
2820 add_filename_language (".f90", language_fortran);
2821 add_filename_language (".F90", language_fortran);
2822 add_filename_language (".f95", language_fortran);
2823 add_filename_language (".F95", language_fortran);
2824 add_filename_language (".f03", language_fortran);
2825 add_filename_language (".F03", language_fortran);
2826 add_filename_language (".f08", language_fortran);
2827 add_filename_language (".F08", language_fortran);
2828 add_filename_language (".s", language_asm);
2829 add_filename_language (".sx", language_asm);
2830 add_filename_language (".S", language_asm);
2831 add_filename_language (".pas", language_pascal);
2832 add_filename_language (".p", language_pascal);
2833 add_filename_language (".pp", language_pascal);
2834 add_filename_language (".adb", language_ada);
2835 add_filename_language (".ads", language_ada);
2836 add_filename_language (".a", language_ada);
2837 add_filename_language (".ada", language_ada);
2838 add_filename_language (".dg", language_ada);
2843 deduce_language_from_filename (const char *filename)
2848 if (filename != NULL)
2849 if ((cp = strrchr (filename, '.')) != NULL)
2850 for (i = 0; i < fl_table_next; i++)
2851 if (strcmp (cp, filename_language_table[i].ext) == 0)
2852 return filename_language_table[i].lang;
2854 return language_unknown;
2859 Allocate and partly initialize a new symbol table. Return a pointer
2860 to it. error() if no space.
2862 Caller must set these fields:
2871 allocate_symtab (const char *filename, struct objfile *objfile)
2873 struct symtab *symtab;
2875 symtab = (struct symtab *)
2876 obstack_alloc (&objfile->objfile_obstack, sizeof (struct symtab));
2877 memset (symtab, 0, sizeof (*symtab));
2878 symtab->filename = (char *) bcache (filename, strlen (filename) + 1,
2879 objfile->per_bfd->filename_cache);
2880 symtab->fullname = NULL;
2881 symtab->language = deduce_language_from_filename (filename);
2882 symtab->debugformat = "unknown";
2884 /* Hook it to the objfile it comes from. */
2886 symtab->objfile = objfile;
2887 symtab->next = objfile->symtabs;
2888 objfile->symtabs = symtab;
2890 if (symtab_create_debug)
2892 /* Be a bit clever with debugging messages, and don't print objfile
2893 every time, only when it changes. */
2894 static char *last_objfile_name = NULL;
2896 if (last_objfile_name == NULL
2897 || strcmp (last_objfile_name, objfile->name) != 0)
2899 xfree (last_objfile_name);
2900 last_objfile_name = xstrdup (objfile->name);
2901 fprintf_unfiltered (gdb_stdlog,
2902 "Creating one or more symtabs for objfile %s ...\n",
2905 fprintf_unfiltered (gdb_stdlog,
2906 "Created symtab %s for module %s.\n",
2907 host_address_to_string (symtab), filename);
2914 /* Reset all data structures in gdb which may contain references to symbol
2915 table data. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
2918 clear_symtab_users (int add_flags)
2920 /* Someday, we should do better than this, by only blowing away
2921 the things that really need to be blown. */
2923 /* Clear the "current" symtab first, because it is no longer valid.
2924 breakpoint_re_set may try to access the current symtab. */
2925 clear_current_source_symtab_and_line ();
2928 if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0)
2929 breakpoint_re_set ();
2930 clear_last_displayed_sal ();
2931 clear_pc_function_cache ();
2932 observer_notify_new_objfile (NULL);
2934 /* Clear globals which might have pointed into a removed objfile.
2935 FIXME: It's not clear which of these are supposed to persist
2936 between expressions and which ought to be reset each time. */
2937 expression_context_block = NULL;
2938 innermost_block = NULL;
2940 /* Varobj may refer to old symbols, perform a cleanup. */
2941 varobj_invalidate ();
2946 clear_symtab_users_cleanup (void *ignore)
2948 clear_symtab_users (0);
2952 The following code implements an abstraction for debugging overlay sections.
2954 The target model is as follows:
2955 1) The gnu linker will permit multiple sections to be mapped into the
2956 same VMA, each with its own unique LMA (or load address).
2957 2) It is assumed that some runtime mechanism exists for mapping the
2958 sections, one by one, from the load address into the VMA address.
2959 3) This code provides a mechanism for gdb to keep track of which
2960 sections should be considered to be mapped from the VMA to the LMA.
2961 This information is used for symbol lookup, and memory read/write.
2962 For instance, if a section has been mapped then its contents
2963 should be read from the VMA, otherwise from the LMA.
2965 Two levels of debugger support for overlays are available. One is
2966 "manual", in which the debugger relies on the user to tell it which
2967 overlays are currently mapped. This level of support is
2968 implemented entirely in the core debugger, and the information about
2969 whether a section is mapped is kept in the objfile->obj_section table.
2971 The second level of support is "automatic", and is only available if
2972 the target-specific code provides functionality to read the target's
2973 overlay mapping table, and translate its contents for the debugger
2974 (by updating the mapped state information in the obj_section tables).
2976 The interface is as follows:
2978 overlay map <name> -- tell gdb to consider this section mapped
2979 overlay unmap <name> -- tell gdb to consider this section unmapped
2980 overlay list -- list the sections that GDB thinks are mapped
2981 overlay read-target -- get the target's state of what's mapped
2982 overlay off/manual/auto -- set overlay debugging state
2983 Functional interface:
2984 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2985 section, return that section.
2986 find_pc_overlay(pc): find any overlay section that contains
2987 the pc, either in its VMA or its LMA
2988 section_is_mapped(sect): true if overlay is marked as mapped
2989 section_is_overlay(sect): true if section's VMA != LMA
2990 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2991 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2992 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap
2993 overlay_mapped_address(...): map an address from section's LMA to VMA
2994 overlay_unmapped_address(...): map an address from section's VMA to LMA
2995 symbol_overlayed_address(...): Return a "current" address for symbol:
2996 either in VMA or LMA depending on whether
2997 the symbol's section is currently mapped. */
2999 /* Overlay debugging state: */
3001 enum overlay_debugging_state overlay_debugging = ovly_off;
3002 int overlay_cache_invalid = 0; /* True if need to refresh mapped state. */
3004 /* Function: section_is_overlay (SECTION)
3005 Returns true if SECTION has VMA not equal to LMA, ie.
3006 SECTION is loaded at an address different from where it will "run". */
3009 section_is_overlay (struct obj_section *section)
3011 if (overlay_debugging && section)
3013 bfd *abfd = section->objfile->obfd;
3014 asection *bfd_section = section->the_bfd_section;
3016 if (bfd_section_lma (abfd, bfd_section) != 0
3017 && bfd_section_lma (abfd, bfd_section)
3018 != bfd_section_vma (abfd, bfd_section))
3025 /* Function: overlay_invalidate_all (void)
3026 Invalidate the mapped state of all overlay sections (mark it as stale). */
3029 overlay_invalidate_all (void)
3031 struct objfile *objfile;
3032 struct obj_section *sect;
3034 ALL_OBJSECTIONS (objfile, sect)
3035 if (section_is_overlay (sect))
3036 sect->ovly_mapped = -1;
3039 /* Function: section_is_mapped (SECTION)
3040 Returns true if section is an overlay, and is currently mapped.
3042 Access to the ovly_mapped flag is restricted to this function, so
3043 that we can do automatic update. If the global flag
3044 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
3045 overlay_invalidate_all. If the mapped state of the particular
3046 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
3049 section_is_mapped (struct obj_section *osect)
3051 struct gdbarch *gdbarch;
3053 if (osect == 0 || !section_is_overlay (osect))
3056 switch (overlay_debugging)
3060 return 0; /* overlay debugging off */
3061 case ovly_auto: /* overlay debugging automatic */
3062 /* Unles there is a gdbarch_overlay_update function,
3063 there's really nothing useful to do here (can't really go auto). */
3064 gdbarch = get_objfile_arch (osect->objfile);
3065 if (gdbarch_overlay_update_p (gdbarch))
3067 if (overlay_cache_invalid)
3069 overlay_invalidate_all ();
3070 overlay_cache_invalid = 0;
3072 if (osect->ovly_mapped == -1)
3073 gdbarch_overlay_update (gdbarch, osect);
3075 /* fall thru to manual case */
3076 case ovly_on: /* overlay debugging manual */
3077 return osect->ovly_mapped == 1;
3081 /* Function: pc_in_unmapped_range
3082 If PC falls into the lma range of SECTION, return true, else false. */
3085 pc_in_unmapped_range (CORE_ADDR pc, struct obj_section *section)
3087 if (section_is_overlay (section))
3089 bfd *abfd = section->objfile->obfd;
3090 asection *bfd_section = section->the_bfd_section;
3092 /* We assume the LMA is relocated by the same offset as the VMA. */
3093 bfd_vma size = bfd_get_section_size (bfd_section);
3094 CORE_ADDR offset = obj_section_offset (section);
3096 if (bfd_get_section_lma (abfd, bfd_section) + offset <= pc
3097 && pc < bfd_get_section_lma (abfd, bfd_section) + offset + size)
3104 /* Function: pc_in_mapped_range
3105 If PC falls into the vma range of SECTION, return true, else false. */
3108 pc_in_mapped_range (CORE_ADDR pc, struct obj_section *section)
3110 if (section_is_overlay (section))
3112 if (obj_section_addr (section) <= pc
3113 && pc < obj_section_endaddr (section))
3121 /* Return true if the mapped ranges of sections A and B overlap, false
3124 sections_overlap (struct obj_section *a, struct obj_section *b)
3126 CORE_ADDR a_start = obj_section_addr (a);
3127 CORE_ADDR a_end = obj_section_endaddr (a);
3128 CORE_ADDR b_start = obj_section_addr (b);
3129 CORE_ADDR b_end = obj_section_endaddr (b);
3131 return (a_start < b_end && b_start < a_end);
3134 /* Function: overlay_unmapped_address (PC, SECTION)
3135 Returns the address corresponding to PC in the unmapped (load) range.
3136 May be the same as PC. */
3139 overlay_unmapped_address (CORE_ADDR pc, struct obj_section *section)
3141 if (section_is_overlay (section) && pc_in_mapped_range (pc, section))
3143 bfd *abfd = section->objfile->obfd;
3144 asection *bfd_section = section->the_bfd_section;
3146 return pc + bfd_section_lma (abfd, bfd_section)
3147 - bfd_section_vma (abfd, bfd_section);
3153 /* Function: overlay_mapped_address (PC, SECTION)
3154 Returns the address corresponding to PC in the mapped (runtime) range.
3155 May be the same as PC. */
3158 overlay_mapped_address (CORE_ADDR pc, struct obj_section *section)
3160 if (section_is_overlay (section) && pc_in_unmapped_range (pc, section))
3162 bfd *abfd = section->objfile->obfd;
3163 asection *bfd_section = section->the_bfd_section;
3165 return pc + bfd_section_vma (abfd, bfd_section)
3166 - bfd_section_lma (abfd, bfd_section);
3173 /* Function: symbol_overlayed_address
3174 Return one of two addresses (relative to the VMA or to the LMA),
3175 depending on whether the section is mapped or not. */
3178 symbol_overlayed_address (CORE_ADDR address, struct obj_section *section)
3180 if (overlay_debugging)
3182 /* If the symbol has no section, just return its regular address. */
3185 /* If the symbol's section is not an overlay, just return its
3187 if (!section_is_overlay (section))
3189 /* If the symbol's section is mapped, just return its address. */
3190 if (section_is_mapped (section))
3193 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
3194 * then return its LOADED address rather than its vma address!!
3196 return overlay_unmapped_address (address, section);
3201 /* Function: find_pc_overlay (PC)
3202 Return the best-match overlay section for PC:
3203 If PC matches a mapped overlay section's VMA, return that section.
3204 Else if PC matches an unmapped section's VMA, return that section.
3205 Else if PC matches an unmapped section's LMA, return that section. */
3207 struct obj_section *
3208 find_pc_overlay (CORE_ADDR pc)
3210 struct objfile *objfile;
3211 struct obj_section *osect, *best_match = NULL;
3213 if (overlay_debugging)
3214 ALL_OBJSECTIONS (objfile, osect)
3215 if (section_is_overlay (osect))
3217 if (pc_in_mapped_range (pc, osect))
3219 if (section_is_mapped (osect))
3224 else if (pc_in_unmapped_range (pc, osect))
3230 /* Function: find_pc_mapped_section (PC)
3231 If PC falls into the VMA address range of an overlay section that is
3232 currently marked as MAPPED, return that section. Else return NULL. */
3234 struct obj_section *
3235 find_pc_mapped_section (CORE_ADDR pc)
3237 struct objfile *objfile;
3238 struct obj_section *osect;
3240 if (overlay_debugging)
3241 ALL_OBJSECTIONS (objfile, osect)
3242 if (pc_in_mapped_range (pc, osect) && section_is_mapped (osect))
3248 /* Function: list_overlays_command
3249 Print a list of mapped sections and their PC ranges. */
3252 list_overlays_command (char *args, int from_tty)
3255 struct objfile *objfile;
3256 struct obj_section *osect;
3258 if (overlay_debugging)
3259 ALL_OBJSECTIONS (objfile, osect)
3260 if (section_is_mapped (osect))
3262 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3267 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section);
3268 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section);
3269 size = bfd_get_section_size (osect->the_bfd_section);
3270 name = bfd_section_name (objfile->obfd, osect->the_bfd_section);
3272 printf_filtered ("Section %s, loaded at ", name);
3273 fputs_filtered (paddress (gdbarch, lma), gdb_stdout);
3274 puts_filtered (" - ");
3275 fputs_filtered (paddress (gdbarch, lma + size), gdb_stdout);
3276 printf_filtered (", mapped at ");
3277 fputs_filtered (paddress (gdbarch, vma), gdb_stdout);
3278 puts_filtered (" - ");
3279 fputs_filtered (paddress (gdbarch, vma + size), gdb_stdout);
3280 puts_filtered ("\n");
3285 printf_filtered (_("No sections are mapped.\n"));
3288 /* Function: map_overlay_command
3289 Mark the named section as mapped (ie. residing at its VMA address). */
3292 map_overlay_command (char *args, int from_tty)
3294 struct objfile *objfile, *objfile2;
3295 struct obj_section *sec, *sec2;
3297 if (!overlay_debugging)
3298 error (_("Overlay debugging not enabled. Use "
3299 "either the 'overlay auto' or\n"
3300 "the 'overlay manual' command."));
3302 if (args == 0 || *args == 0)
3303 error (_("Argument required: name of an overlay section"));
3305 /* First, find a section matching the user supplied argument. */
3306 ALL_OBJSECTIONS (objfile, sec)
3307 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
3309 /* Now, check to see if the section is an overlay. */
3310 if (!section_is_overlay (sec))
3311 continue; /* not an overlay section */
3313 /* Mark the overlay as "mapped". */
3314 sec->ovly_mapped = 1;
3316 /* Next, make a pass and unmap any sections that are
3317 overlapped by this new section: */
3318 ALL_OBJSECTIONS (objfile2, sec2)
3319 if (sec2->ovly_mapped && sec != sec2 && sections_overlap (sec, sec2))
3322 printf_unfiltered (_("Note: section %s unmapped by overlap\n"),
3323 bfd_section_name (objfile->obfd,
3324 sec2->the_bfd_section));
3325 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2. */
3329 error (_("No overlay section called %s"), args);
3332 /* Function: unmap_overlay_command
3333 Mark the overlay section as unmapped
3334 (ie. resident in its LMA address range, rather than the VMA range). */
3337 unmap_overlay_command (char *args, int from_tty)
3339 struct objfile *objfile;
3340 struct obj_section *sec;
3342 if (!overlay_debugging)
3343 error (_("Overlay debugging not enabled. "
3344 "Use either the 'overlay auto' or\n"
3345 "the 'overlay manual' command."));
3347 if (args == 0 || *args == 0)
3348 error (_("Argument required: name of an overlay section"));
3350 /* First, find a section matching the user supplied argument. */
3351 ALL_OBJSECTIONS (objfile, sec)
3352 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
3354 if (!sec->ovly_mapped)
3355 error (_("Section %s is not mapped"), args);
3356 sec->ovly_mapped = 0;
3359 error (_("No overlay section called %s"), args);
3362 /* Function: overlay_auto_command
3363 A utility command to turn on overlay debugging.
3364 Possibly this should be done via a set/show command. */
3367 overlay_auto_command (char *args, int from_tty)
3369 overlay_debugging = ovly_auto;
3370 enable_overlay_breakpoints ();
3372 printf_unfiltered (_("Automatic overlay debugging enabled."));
3375 /* Function: overlay_manual_command
3376 A utility command to turn on overlay debugging.
3377 Possibly this should be done via a set/show command. */
3380 overlay_manual_command (char *args, int from_tty)
3382 overlay_debugging = ovly_on;
3383 disable_overlay_breakpoints ();
3385 printf_unfiltered (_("Overlay debugging enabled."));
3388 /* Function: overlay_off_command
3389 A utility command to turn on overlay debugging.
3390 Possibly this should be done via a set/show command. */
3393 overlay_off_command (char *args, int from_tty)
3395 overlay_debugging = ovly_off;
3396 disable_overlay_breakpoints ();
3398 printf_unfiltered (_("Overlay debugging disabled."));
3402 overlay_load_command (char *args, int from_tty)
3404 struct gdbarch *gdbarch = get_current_arch ();
3406 if (gdbarch_overlay_update_p (gdbarch))
3407 gdbarch_overlay_update (gdbarch, NULL);
3409 error (_("This target does not know how to read its overlay state."));
3412 /* Function: overlay_command
3413 A place-holder for a mis-typed command. */
3415 /* Command list chain containing all defined "overlay" subcommands. */
3416 static struct cmd_list_element *overlaylist;
3419 overlay_command (char *args, int from_tty)
3422 ("\"overlay\" must be followed by the name of an overlay command.\n");
3423 help_list (overlaylist, "overlay ", -1, gdb_stdout);
3427 /* Target Overlays for the "Simplest" overlay manager:
3429 This is GDB's default target overlay layer. It works with the
3430 minimal overlay manager supplied as an example by Cygnus. The
3431 entry point is via a function pointer "gdbarch_overlay_update",
3432 so targets that use a different runtime overlay manager can
3433 substitute their own overlay_update function and take over the
3436 The overlay_update function pokes around in the target's data structures
3437 to see what overlays are mapped, and updates GDB's overlay mapping with
3440 In this simple implementation, the target data structures are as follows:
3441 unsigned _novlys; /# number of overlay sections #/
3442 unsigned _ovly_table[_novlys][4] = {
3443 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
3444 {..., ..., ..., ...},
3446 unsigned _novly_regions; /# number of overlay regions #/
3447 unsigned _ovly_region_table[_novly_regions][3] = {
3448 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
3451 These functions will attempt to update GDB's mappedness state in the
3452 symbol section table, based on the target's mappedness state.
3454 To do this, we keep a cached copy of the target's _ovly_table, and
3455 attempt to detect when the cached copy is invalidated. The main
3456 entry point is "simple_overlay_update(SECT), which looks up SECT in
3457 the cached table and re-reads only the entry for that section from
3458 the target (whenever possible). */
3460 /* Cached, dynamically allocated copies of the target data structures: */
3461 static unsigned (*cache_ovly_table)[4] = 0;
3462 static unsigned cache_novlys = 0;
3463 static CORE_ADDR cache_ovly_table_base = 0;
3466 VMA, SIZE, LMA, MAPPED
3469 /* Throw away the cached copy of _ovly_table. */
3471 simple_free_overlay_table (void)
3473 if (cache_ovly_table)
3474 xfree (cache_ovly_table);
3476 cache_ovly_table = NULL;
3477 cache_ovly_table_base = 0;
3480 /* Read an array of ints of size SIZE from the target into a local buffer.
3481 Convert to host order. int LEN is number of ints. */
3483 read_target_long_array (CORE_ADDR memaddr, unsigned int *myaddr,
3484 int len, int size, enum bfd_endian byte_order)
3486 /* FIXME (alloca): Not safe if array is very large. */
3487 gdb_byte *buf = alloca (len * size);
3490 read_memory (memaddr, buf, len * size);
3491 for (i = 0; i < len; i++)
3492 myaddr[i] = extract_unsigned_integer (size * i + buf, size, byte_order);
3495 /* Find and grab a copy of the target _ovly_table
3496 (and _novlys, which is needed for the table's size). */
3498 simple_read_overlay_table (void)
3500 struct minimal_symbol *novlys_msym, *ovly_table_msym;
3501 struct gdbarch *gdbarch;
3503 enum bfd_endian byte_order;
3505 simple_free_overlay_table ();
3506 novlys_msym = lookup_minimal_symbol ("_novlys", NULL, NULL);
3509 error (_("Error reading inferior's overlay table: "
3510 "couldn't find `_novlys' variable\n"
3511 "in inferior. Use `overlay manual' mode."));
3515 ovly_table_msym = lookup_minimal_symbol ("_ovly_table", NULL, NULL);
3516 if (! ovly_table_msym)
3518 error (_("Error reading inferior's overlay table: couldn't find "
3519 "`_ovly_table' array\n"
3520 "in inferior. Use `overlay manual' mode."));
3524 gdbarch = get_objfile_arch (msymbol_objfile (ovly_table_msym));
3525 word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
3526 byte_order = gdbarch_byte_order (gdbarch);
3528 cache_novlys = read_memory_integer (SYMBOL_VALUE_ADDRESS (novlys_msym),
3531 = (void *) xmalloc (cache_novlys * sizeof (*cache_ovly_table));
3532 cache_ovly_table_base = SYMBOL_VALUE_ADDRESS (ovly_table_msym);
3533 read_target_long_array (cache_ovly_table_base,
3534 (unsigned int *) cache_ovly_table,
3535 cache_novlys * 4, word_size, byte_order);
3537 return 1; /* SUCCESS */
3540 /* Function: simple_overlay_update_1
3541 A helper function for simple_overlay_update. Assuming a cached copy
3542 of _ovly_table exists, look through it to find an entry whose vma,
3543 lma and size match those of OSECT. Re-read the entry and make sure
3544 it still matches OSECT (else the table may no longer be valid).
3545 Set OSECT's mapped state to match the entry. Return: 1 for
3546 success, 0 for failure. */
3549 simple_overlay_update_1 (struct obj_section *osect)
3552 bfd *obfd = osect->objfile->obfd;
3553 asection *bsect = osect->the_bfd_section;
3554 struct gdbarch *gdbarch = get_objfile_arch (osect->objfile);
3555 int word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
3556 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
3558 size = bfd_get_section_size (osect->the_bfd_section);
3559 for (i = 0; i < cache_novlys; i++)
3560 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3561 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3562 /* && cache_ovly_table[i][SIZE] == size */ )
3564 read_target_long_array (cache_ovly_table_base + i * word_size,
3565 (unsigned int *) cache_ovly_table[i],
3566 4, word_size, byte_order);
3567 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3568 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3569 /* && cache_ovly_table[i][SIZE] == size */ )
3571 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3574 else /* Warning! Warning! Target's ovly table has changed! */
3580 /* Function: simple_overlay_update
3581 If OSECT is NULL, then update all sections' mapped state
3582 (after re-reading the entire target _ovly_table).
3583 If OSECT is non-NULL, then try to find a matching entry in the
3584 cached ovly_table and update only OSECT's mapped state.
3585 If a cached entry can't be found or the cache isn't valid, then
3586 re-read the entire cache, and go ahead and update all sections. */
3589 simple_overlay_update (struct obj_section *osect)
3591 struct objfile *objfile;
3593 /* Were we given an osect to look up? NULL means do all of them. */
3595 /* Have we got a cached copy of the target's overlay table? */
3596 if (cache_ovly_table != NULL)
3598 /* Does its cached location match what's currently in the
3600 struct minimal_symbol *minsym
3601 = lookup_minimal_symbol ("_ovly_table", NULL, NULL);
3604 error (_("Error reading inferior's overlay table: couldn't "
3605 "find `_ovly_table' array\n"
3606 "in inferior. Use `overlay manual' mode."));
3608 if (cache_ovly_table_base == SYMBOL_VALUE_ADDRESS (minsym))
3609 /* Then go ahead and try to look up this single section in
3611 if (simple_overlay_update_1 (osect))
3612 /* Found it! We're done. */
3616 /* Cached table no good: need to read the entire table anew.
3617 Or else we want all the sections, in which case it's actually
3618 more efficient to read the whole table in one block anyway. */
3620 if (! simple_read_overlay_table ())
3623 /* Now may as well update all sections, even if only one was requested. */
3624 ALL_OBJSECTIONS (objfile, osect)
3625 if (section_is_overlay (osect))
3628 bfd *obfd = osect->objfile->obfd;
3629 asection *bsect = osect->the_bfd_section;
3631 size = bfd_get_section_size (bsect);
3632 for (i = 0; i < cache_novlys; i++)
3633 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3634 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3635 /* && cache_ovly_table[i][SIZE] == size */ )
3636 { /* obj_section matches i'th entry in ovly_table. */
3637 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3638 break; /* finished with inner for loop: break out. */
3643 /* Set the output sections and output offsets for section SECTP in
3644 ABFD. The relocation code in BFD will read these offsets, so we
3645 need to be sure they're initialized. We map each section to itself,
3646 with no offset; this means that SECTP->vma will be honored. */
3649 symfile_dummy_outputs (bfd *abfd, asection *sectp, void *dummy)
3651 sectp->output_section = sectp;
3652 sectp->output_offset = 0;
3655 /* Default implementation for sym_relocate. */
3659 default_symfile_relocate (struct objfile *objfile, asection *sectp,
3662 /* Use sectp->owner instead of objfile->obfd. sectp may point to a
3664 bfd *abfd = sectp->owner;
3666 /* We're only interested in sections with relocation
3668 if ((sectp->flags & SEC_RELOC) == 0)
3671 /* We will handle section offsets properly elsewhere, so relocate as if
3672 all sections begin at 0. */
3673 bfd_map_over_sections (abfd, symfile_dummy_outputs, NULL);
3675 return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL);
3678 /* Relocate the contents of a debug section SECTP in ABFD. The
3679 contents are stored in BUF if it is non-NULL, or returned in a
3680 malloc'd buffer otherwise.
3682 For some platforms and debug info formats, shared libraries contain
3683 relocations against the debug sections (particularly for DWARF-2;
3684 one affected platform is PowerPC GNU/Linux, although it depends on
3685 the version of the linker in use). Also, ELF object files naturally
3686 have unresolved relocations for their debug sections. We need to apply
3687 the relocations in order to get the locations of symbols correct.
3688 Another example that may require relocation processing, is the
3689 DWARF-2 .eh_frame section in .o files, although it isn't strictly a
3693 symfile_relocate_debug_section (struct objfile *objfile,
3694 asection *sectp, bfd_byte *buf)
3696 gdb_assert (objfile->sf->sym_relocate);
3698 return (*objfile->sf->sym_relocate) (objfile, sectp, buf);
3701 struct symfile_segment_data *
3702 get_symfile_segment_data (bfd *abfd)
3704 const struct sym_fns *sf = find_sym_fns (abfd);
3709 return sf->sym_segments (abfd);
3713 free_symfile_segment_data (struct symfile_segment_data *data)
3715 xfree (data->segment_bases);
3716 xfree (data->segment_sizes);
3717 xfree (data->segment_info);
3723 - DATA, containing segment addresses from the object file ABFD, and
3724 the mapping from ABFD's sections onto the segments that own them,
3726 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual
3727 segment addresses reported by the target,
3728 store the appropriate offsets for each section in OFFSETS.
3730 If there are fewer entries in SEGMENT_BASES than there are segments
3731 in DATA, then apply SEGMENT_BASES' last entry to all the segments.
3733 If there are more entries, then ignore the extra. The target may
3734 not be able to distinguish between an empty data segment and a
3735 missing data segment; a missing text segment is less plausible. */
3737 symfile_map_offsets_to_segments (bfd *abfd, struct symfile_segment_data *data,
3738 struct section_offsets *offsets,
3739 int num_segment_bases,
3740 const CORE_ADDR *segment_bases)
3745 /* It doesn't make sense to call this function unless you have some
3746 segment base addresses. */
3747 gdb_assert (num_segment_bases > 0);
3749 /* If we do not have segment mappings for the object file, we
3750 can not relocate it by segments. */
3751 gdb_assert (data != NULL);
3752 gdb_assert (data->num_segments > 0);
3754 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
3756 int which = data->segment_info[i];
3758 gdb_assert (0 <= which && which <= data->num_segments);
3760 /* Don't bother computing offsets for sections that aren't
3761 loaded as part of any segment. */
3765 /* Use the last SEGMENT_BASES entry as the address of any extra
3766 segments mentioned in DATA->segment_info. */
3767 if (which > num_segment_bases)
3768 which = num_segment_bases;
3770 offsets->offsets[i] = (segment_bases[which - 1]
3771 - data->segment_bases[which - 1]);
3778 symfile_find_segment_sections (struct objfile *objfile)
3780 bfd *abfd = objfile->obfd;
3783 struct symfile_segment_data *data;
3785 data = get_symfile_segment_data (objfile->obfd);
3789 if (data->num_segments != 1 && data->num_segments != 2)
3791 free_symfile_segment_data (data);
3795 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
3797 int which = data->segment_info[i];
3801 if (objfile->sect_index_text == -1)
3802 objfile->sect_index_text = sect->index;
3804 if (objfile->sect_index_rodata == -1)
3805 objfile->sect_index_rodata = sect->index;
3807 else if (which == 2)
3809 if (objfile->sect_index_data == -1)
3810 objfile->sect_index_data = sect->index;
3812 if (objfile->sect_index_bss == -1)
3813 objfile->sect_index_bss = sect->index;
3817 free_symfile_segment_data (data);
3821 _initialize_symfile (void)
3823 struct cmd_list_element *c;
3825 c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\
3826 Load symbol table from executable file FILE.\n\
3827 The `file' command can also load symbol tables, as well as setting the file\n\
3828 to execute."), &cmdlist);
3829 set_cmd_completer (c, filename_completer);
3831 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command, _("\
3832 Load symbols from FILE, assuming FILE has been dynamically loaded.\n\
3833 Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR>\
3834 ...]\nADDR is the starting address of the file's text.\n\
3835 The optional arguments are section-name section-address pairs and\n\
3836 should be specified if the data and bss segments are not contiguous\n\
3837 with the text. SECT is a section name to be loaded at SECT_ADDR."),
3839 set_cmd_completer (c, filename_completer);
3841 c = add_cmd ("load", class_files, load_command, _("\
3842 Dynamically load FILE into the running program, and record its symbols\n\
3843 for access from GDB.\n\
3844 A load OFFSET may also be given."), &cmdlist);
3845 set_cmd_completer (c, filename_completer);
3847 add_prefix_cmd ("overlay", class_support, overlay_command,
3848 _("Commands for debugging overlays."), &overlaylist,
3849 "overlay ", 0, &cmdlist);
3851 add_com_alias ("ovly", "overlay", class_alias, 1);
3852 add_com_alias ("ov", "overlay", class_alias, 1);
3854 add_cmd ("map-overlay", class_support, map_overlay_command,
3855 _("Assert that an overlay section is mapped."), &overlaylist);
3857 add_cmd ("unmap-overlay", class_support, unmap_overlay_command,
3858 _("Assert that an overlay section is unmapped."), &overlaylist);
3860 add_cmd ("list-overlays", class_support, list_overlays_command,
3861 _("List mappings of overlay sections."), &overlaylist);
3863 add_cmd ("manual", class_support, overlay_manual_command,
3864 _("Enable overlay debugging."), &overlaylist);
3865 add_cmd ("off", class_support, overlay_off_command,
3866 _("Disable overlay debugging."), &overlaylist);
3867 add_cmd ("auto", class_support, overlay_auto_command,
3868 _("Enable automatic overlay debugging."), &overlaylist);
3869 add_cmd ("load-target", class_support, overlay_load_command,
3870 _("Read the overlay mapping state from the target."), &overlaylist);
3872 /* Filename extension to source language lookup table: */
3873 init_filename_language_table ();
3874 add_setshow_string_noescape_cmd ("extension-language", class_files,
3876 Set mapping between filename extension and source language."), _("\
3877 Show mapping between filename extension and source language."), _("\
3878 Usage: set extension-language .foo bar"),
3879 set_ext_lang_command,
3881 &setlist, &showlist);
3883 add_info ("extensions", info_ext_lang_command,
3884 _("All filename extensions associated with a source language."));
3886 add_setshow_optional_filename_cmd ("debug-file-directory", class_support,
3887 &debug_file_directory, _("\
3888 Set the directories where separate debug symbols are searched for."), _("\
3889 Show the directories where separate debug symbols are searched for."), _("\
3890 Separate debug symbols are first searched for in the same\n\
3891 directory as the binary, then in the `" DEBUG_SUBDIRECTORY "' subdirectory,\n\
3892 and lastly at the path of the directory of the binary with\n\
3893 each global debug-file-directory component prepended."),
3895 show_debug_file_directory,
3896 &setlist, &showlist);