1 /* Generic symbol file reading for the GNU debugger, GDB.
3 Copyright (C) 1990-2017 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"
51 #include "parser-defs.h"
58 #include "cli/cli-utils.h"
60 #include <sys/types.h>
68 int (*deprecated_ui_load_progress_hook) (const char *section,
70 void (*deprecated_show_load_progress) (const char *section,
71 unsigned long section_sent,
72 unsigned long section_size,
73 unsigned long total_sent,
74 unsigned long total_size);
75 void (*deprecated_pre_add_symbol_hook) (const char *);
76 void (*deprecated_post_add_symbol_hook) (void);
78 static void clear_symtab_users_cleanup (void *ignore);
80 /* Global variables owned by this file. */
81 int readnow_symbol_files; /* Read full symbols immediately. */
83 /* Functions this file defines. */
85 static void load_command (char *, int);
87 static void symbol_file_add_main_1 (const char *args, symfile_add_flags add_flags,
90 static void add_symbol_file_command (char *, int);
92 static const struct sym_fns *find_sym_fns (bfd *);
94 static void overlay_invalidate_all (void);
96 static void overlay_auto_command (char *, int);
98 static void overlay_manual_command (char *, int);
100 static void overlay_off_command (char *, int);
102 static void overlay_load_command (char *, int);
104 static void overlay_command (char *, int);
106 static void simple_free_overlay_table (void);
108 static void read_target_long_array (CORE_ADDR, unsigned int *, int, int,
111 static int simple_read_overlay_table (void);
113 static int simple_overlay_update_1 (struct obj_section *);
115 static void info_ext_lang_command (char *args, int from_tty);
117 static void symfile_find_segment_sections (struct objfile *objfile);
119 void _initialize_symfile (void);
121 /* List of all available sym_fns. On gdb startup, each object file reader
122 calls add_symtab_fns() to register information on each format it is
127 /* BFD flavour that we handle. */
128 enum bfd_flavour sym_flavour;
130 /* The "vtable" of symbol functions. */
131 const struct sym_fns *sym_fns;
132 } registered_sym_fns;
134 DEF_VEC_O (registered_sym_fns);
136 static VEC (registered_sym_fns) *symtab_fns = NULL;
138 /* Values for "set print symbol-loading". */
140 const char print_symbol_loading_off[] = "off";
141 const char print_symbol_loading_brief[] = "brief";
142 const char print_symbol_loading_full[] = "full";
143 static const char *print_symbol_loading_enums[] =
145 print_symbol_loading_off,
146 print_symbol_loading_brief,
147 print_symbol_loading_full,
150 static const char *print_symbol_loading = print_symbol_loading_full;
152 /* If non-zero, shared library symbols will be added automatically
153 when the inferior is created, new libraries are loaded, or when
154 attaching to the inferior. This is almost always what users will
155 want to have happen; but for very large programs, the startup time
156 will be excessive, and so if this is a problem, the user can clear
157 this flag and then add the shared library symbols as needed. Note
158 that there is a potential for confusion, since if the shared
159 library symbols are not loaded, commands like "info fun" will *not*
160 report all the functions that are actually present. */
162 int auto_solib_add = 1;
165 /* Return non-zero if symbol-loading messages should be printed.
166 FROM_TTY is the standard from_tty argument to gdb commands.
167 If EXEC is non-zero the messages are for the executable.
168 Otherwise, messages are for shared libraries.
169 If FULL is non-zero then the caller is printing a detailed message.
170 E.g., the message includes the shared library name.
171 Otherwise, the caller is printing a brief "summary" message. */
174 print_symbol_loading_p (int from_tty, int exec, int full)
176 if (!from_tty && !info_verbose)
181 /* We don't check FULL for executables, there are few such
182 messages, therefore brief == full. */
183 return print_symbol_loading != print_symbol_loading_off;
186 return print_symbol_loading == print_symbol_loading_full;
187 return print_symbol_loading == print_symbol_loading_brief;
190 /* True if we are reading a symbol table. */
192 int currently_reading_symtab = 0;
194 /* Increment currently_reading_symtab and return a cleanup that can be
195 used to decrement it. */
197 scoped_restore_tmpl<int>
198 increment_reading_symtab (void)
200 gdb_assert (currently_reading_symtab >= 0);
201 return make_scoped_restore (¤tly_reading_symtab,
202 currently_reading_symtab + 1);
205 /* Remember the lowest-addressed loadable section we've seen.
206 This function is called via bfd_map_over_sections.
208 In case of equal vmas, the section with the largest size becomes the
209 lowest-addressed loadable section.
211 If the vmas and sizes are equal, the last section is considered the
212 lowest-addressed loadable section. */
215 find_lowest_section (bfd *abfd, asection *sect, void *obj)
217 asection **lowest = (asection **) obj;
219 if (0 == (bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD)))
222 *lowest = sect; /* First loadable section */
223 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
224 *lowest = sect; /* A lower loadable section */
225 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
226 && (bfd_section_size (abfd, (*lowest))
227 <= bfd_section_size (abfd, sect)))
231 /* Create a new section_addr_info, with room for NUM_SECTIONS. The
232 new object's 'num_sections' field is set to 0; it must be updated
235 struct section_addr_info *
236 alloc_section_addr_info (size_t num_sections)
238 struct section_addr_info *sap;
241 size = (sizeof (struct section_addr_info)
242 + sizeof (struct other_sections) * (num_sections - 1));
243 sap = (struct section_addr_info *) xmalloc (size);
244 memset (sap, 0, size);
249 /* Build (allocate and populate) a section_addr_info struct from
250 an existing section table. */
252 extern struct section_addr_info *
253 build_section_addr_info_from_section_table (const struct target_section *start,
254 const struct target_section *end)
256 struct section_addr_info *sap;
257 const struct target_section *stp;
260 sap = alloc_section_addr_info (end - start);
262 for (stp = start, oidx = 0; stp != end; stp++)
264 struct bfd_section *asect = stp->the_bfd_section;
265 bfd *abfd = asect->owner;
267 if (bfd_get_section_flags (abfd, asect) & (SEC_ALLOC | SEC_LOAD)
268 && oidx < end - start)
270 sap->other[oidx].addr = stp->addr;
271 sap->other[oidx].name = xstrdup (bfd_section_name (abfd, asect));
272 sap->other[oidx].sectindex = gdb_bfd_section_index (abfd, asect);
277 sap->num_sections = oidx;
282 /* Create a section_addr_info from section offsets in ABFD. */
284 static struct section_addr_info *
285 build_section_addr_info_from_bfd (bfd *abfd)
287 struct section_addr_info *sap;
289 struct bfd_section *sec;
291 sap = alloc_section_addr_info (bfd_count_sections (abfd));
292 for (i = 0, sec = abfd->sections; sec != NULL; sec = sec->next)
293 if (bfd_get_section_flags (abfd, sec) & (SEC_ALLOC | SEC_LOAD))
295 sap->other[i].addr = bfd_get_section_vma (abfd, sec);
296 sap->other[i].name = xstrdup (bfd_get_section_name (abfd, sec));
297 sap->other[i].sectindex = gdb_bfd_section_index (abfd, sec);
301 sap->num_sections = i;
306 /* Create a section_addr_info from section offsets in OBJFILE. */
308 struct section_addr_info *
309 build_section_addr_info_from_objfile (const struct objfile *objfile)
311 struct section_addr_info *sap;
314 /* Before reread_symbols gets rewritten it is not safe to call:
315 gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd));
317 sap = build_section_addr_info_from_bfd (objfile->obfd);
318 for (i = 0; i < sap->num_sections; i++)
320 int sectindex = sap->other[i].sectindex;
322 sap->other[i].addr += objfile->section_offsets->offsets[sectindex];
327 /* Free all memory allocated by build_section_addr_info_from_section_table. */
330 free_section_addr_info (struct section_addr_info *sap)
334 for (idx = 0; idx < sap->num_sections; idx++)
335 xfree (sap->other[idx].name);
339 /* Initialize OBJFILE's sect_index_* members. */
342 init_objfile_sect_indices (struct objfile *objfile)
347 sect = bfd_get_section_by_name (objfile->obfd, ".text");
349 objfile->sect_index_text = sect->index;
351 sect = bfd_get_section_by_name (objfile->obfd, ".data");
353 objfile->sect_index_data = sect->index;
355 sect = bfd_get_section_by_name (objfile->obfd, ".bss");
357 objfile->sect_index_bss = sect->index;
359 sect = bfd_get_section_by_name (objfile->obfd, ".rodata");
361 objfile->sect_index_rodata = sect->index;
363 /* This is where things get really weird... We MUST have valid
364 indices for the various sect_index_* members or gdb will abort.
365 So if for example, there is no ".text" section, we have to
366 accomodate that. First, check for a file with the standard
367 one or two segments. */
369 symfile_find_segment_sections (objfile);
371 /* Except when explicitly adding symbol files at some address,
372 section_offsets contains nothing but zeros, so it doesn't matter
373 which slot in section_offsets the individual sect_index_* members
374 index into. So if they are all zero, it is safe to just point
375 all the currently uninitialized indices to the first slot. But
376 beware: if this is the main executable, it may be relocated
377 later, e.g. by the remote qOffsets packet, and then this will
378 be wrong! That's why we try segments first. */
380 for (i = 0; i < objfile->num_sections; i++)
382 if (ANOFFSET (objfile->section_offsets, i) != 0)
387 if (i == objfile->num_sections)
389 if (objfile->sect_index_text == -1)
390 objfile->sect_index_text = 0;
391 if (objfile->sect_index_data == -1)
392 objfile->sect_index_data = 0;
393 if (objfile->sect_index_bss == -1)
394 objfile->sect_index_bss = 0;
395 if (objfile->sect_index_rodata == -1)
396 objfile->sect_index_rodata = 0;
400 /* The arguments to place_section. */
402 struct place_section_arg
404 struct section_offsets *offsets;
408 /* Find a unique offset to use for loadable section SECT if
409 the user did not provide an offset. */
412 place_section (bfd *abfd, asection *sect, void *obj)
414 struct place_section_arg *arg = (struct place_section_arg *) obj;
415 CORE_ADDR *offsets = arg->offsets->offsets, start_addr;
417 ULONGEST align = ((ULONGEST) 1) << bfd_get_section_alignment (abfd, sect);
419 /* We are only interested in allocated sections. */
420 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
423 /* If the user specified an offset, honor it. */
424 if (offsets[gdb_bfd_section_index (abfd, sect)] != 0)
427 /* Otherwise, let's try to find a place for the section. */
428 start_addr = (arg->lowest + align - 1) & -align;
435 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
437 int indx = cur_sec->index;
439 /* We don't need to compare against ourself. */
443 /* We can only conflict with allocated sections. */
444 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
447 /* If the section offset is 0, either the section has not been placed
448 yet, or it was the lowest section placed (in which case LOWEST
449 will be past its end). */
450 if (offsets[indx] == 0)
453 /* If this section would overlap us, then we must move up. */
454 if (start_addr + bfd_get_section_size (sect) > offsets[indx]
455 && start_addr < offsets[indx] + bfd_get_section_size (cur_sec))
457 start_addr = offsets[indx] + bfd_get_section_size (cur_sec);
458 start_addr = (start_addr + align - 1) & -align;
463 /* Otherwise, we appear to be OK. So far. */
468 offsets[gdb_bfd_section_index (abfd, sect)] = start_addr;
469 arg->lowest = start_addr + bfd_get_section_size (sect);
472 /* Store struct section_addr_info as prepared (made relative and with SECTINDEX
473 filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS
477 relative_addr_info_to_section_offsets (struct section_offsets *section_offsets,
479 const struct section_addr_info *addrs)
483 memset (section_offsets, 0, SIZEOF_N_SECTION_OFFSETS (num_sections));
485 /* Now calculate offsets for section that were specified by the caller. */
486 for (i = 0; i < addrs->num_sections; i++)
488 const struct other_sections *osp;
490 osp = &addrs->other[i];
491 if (osp->sectindex == -1)
494 /* Record all sections in offsets. */
495 /* The section_offsets in the objfile are here filled in using
497 section_offsets->offsets[osp->sectindex] = osp->addr;
501 /* Transform section name S for a name comparison. prelink can split section
502 `.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly
503 prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address
504 of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss'
505 (`.sbss') section has invalid (increased) virtual address. */
508 addr_section_name (const char *s)
510 if (strcmp (s, ".dynbss") == 0)
512 if (strcmp (s, ".sdynbss") == 0)
518 /* qsort comparator for addrs_section_sort. Sort entries in ascending order by
519 their (name, sectindex) pair. sectindex makes the sort by name stable. */
522 addrs_section_compar (const void *ap, const void *bp)
524 const struct other_sections *a = *((struct other_sections **) ap);
525 const struct other_sections *b = *((struct other_sections **) bp);
528 retval = strcmp (addr_section_name (a->name), addr_section_name (b->name));
532 return a->sectindex - b->sectindex;
535 /* Provide sorted array of pointers to sections of ADDRS. The array is
536 terminated by NULL. Caller is responsible to call xfree for it. */
538 static struct other_sections **
539 addrs_section_sort (struct section_addr_info *addrs)
541 struct other_sections **array;
544 /* `+ 1' for the NULL terminator. */
545 array = XNEWVEC (struct other_sections *, addrs->num_sections + 1);
546 for (i = 0; i < addrs->num_sections; i++)
547 array[i] = &addrs->other[i];
550 qsort (array, i, sizeof (*array), addrs_section_compar);
555 /* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in
556 also SECTINDEXes specific to ABFD there. This function can be used to
557 rebase ADDRS to start referencing different BFD than before. */
560 addr_info_make_relative (struct section_addr_info *addrs, bfd *abfd)
562 asection *lower_sect;
563 CORE_ADDR lower_offset;
565 struct cleanup *my_cleanup;
566 struct section_addr_info *abfd_addrs;
567 struct other_sections **addrs_sorted, **abfd_addrs_sorted;
568 struct other_sections **addrs_to_abfd_addrs;
570 /* Find lowest loadable section to be used as starting point for
571 continguous sections. */
573 bfd_map_over_sections (abfd, find_lowest_section, &lower_sect);
574 if (lower_sect == NULL)
576 warning (_("no loadable sections found in added symbol-file %s"),
577 bfd_get_filename (abfd));
581 lower_offset = bfd_section_vma (bfd_get_filename (abfd), lower_sect);
583 /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections
584 in ABFD. Section names are not unique - there can be multiple sections of
585 the same name. Also the sections of the same name do not have to be
586 adjacent to each other. Some sections may be present only in one of the
587 files. Even sections present in both files do not have to be in the same
590 Use stable sort by name for the sections in both files. Then linearly
591 scan both lists matching as most of the entries as possible. */
593 addrs_sorted = addrs_section_sort (addrs);
594 my_cleanup = make_cleanup (xfree, addrs_sorted);
596 abfd_addrs = build_section_addr_info_from_bfd (abfd);
597 make_cleanup_free_section_addr_info (abfd_addrs);
598 abfd_addrs_sorted = addrs_section_sort (abfd_addrs);
599 make_cleanup (xfree, abfd_addrs_sorted);
601 /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and
602 ABFD_ADDRS_SORTED. */
604 addrs_to_abfd_addrs = XCNEWVEC (struct other_sections *, addrs->num_sections);
605 make_cleanup (xfree, addrs_to_abfd_addrs);
607 while (*addrs_sorted)
609 const char *sect_name = addr_section_name ((*addrs_sorted)->name);
611 while (*abfd_addrs_sorted
612 && strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
616 if (*abfd_addrs_sorted
617 && strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
622 /* Make the found item directly addressable from ADDRS. */
623 index_in_addrs = *addrs_sorted - addrs->other;
624 gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL);
625 addrs_to_abfd_addrs[index_in_addrs] = *abfd_addrs_sorted;
627 /* Never use the same ABFD entry twice. */
634 /* Calculate offsets for the loadable sections.
635 FIXME! Sections must be in order of increasing loadable section
636 so that contiguous sections can use the lower-offset!!!
638 Adjust offsets if the segments are not contiguous.
639 If the section is contiguous, its offset should be set to
640 the offset of the highest loadable section lower than it
641 (the loadable section directly below it in memory).
642 this_offset = lower_offset = lower_addr - lower_orig_addr */
644 for (i = 0; i < addrs->num_sections; i++)
646 struct other_sections *sect = addrs_to_abfd_addrs[i];
650 /* This is the index used by BFD. */
651 addrs->other[i].sectindex = sect->sectindex;
653 if (addrs->other[i].addr != 0)
655 addrs->other[i].addr -= sect->addr;
656 lower_offset = addrs->other[i].addr;
659 addrs->other[i].addr = lower_offset;
663 /* addr_section_name transformation is not used for SECT_NAME. */
664 const char *sect_name = addrs->other[i].name;
666 /* This section does not exist in ABFD, which is normally
667 unexpected and we want to issue a warning.
669 However, the ELF prelinker does create a few sections which are
670 marked in the main executable as loadable (they are loaded in
671 memory from the DYNAMIC segment) and yet are not present in
672 separate debug info files. This is fine, and should not cause
673 a warning. Shared libraries contain just the section
674 ".gnu.liblist" but it is not marked as loadable there. There is
675 no other way to identify them than by their name as the sections
676 created by prelink have no special flags.
678 For the sections `.bss' and `.sbss' see addr_section_name. */
680 if (!(strcmp (sect_name, ".gnu.liblist") == 0
681 || strcmp (sect_name, ".gnu.conflict") == 0
682 || (strcmp (sect_name, ".bss") == 0
684 && strcmp (addrs->other[i - 1].name, ".dynbss") == 0
685 && addrs_to_abfd_addrs[i - 1] != NULL)
686 || (strcmp (sect_name, ".sbss") == 0
688 && strcmp (addrs->other[i - 1].name, ".sdynbss") == 0
689 && addrs_to_abfd_addrs[i - 1] != NULL)))
690 warning (_("section %s not found in %s"), sect_name,
691 bfd_get_filename (abfd));
693 addrs->other[i].addr = 0;
694 addrs->other[i].sectindex = -1;
698 do_cleanups (my_cleanup);
701 /* Parse the user's idea of an offset for dynamic linking, into our idea
702 of how to represent it for fast symbol reading. This is the default
703 version of the sym_fns.sym_offsets function for symbol readers that
704 don't need to do anything special. It allocates a section_offsets table
705 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
708 default_symfile_offsets (struct objfile *objfile,
709 const struct section_addr_info *addrs)
711 objfile->num_sections = gdb_bfd_count_sections (objfile->obfd);
712 objfile->section_offsets = (struct section_offsets *)
713 obstack_alloc (&objfile->objfile_obstack,
714 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
715 relative_addr_info_to_section_offsets (objfile->section_offsets,
716 objfile->num_sections, addrs);
718 /* For relocatable files, all loadable sections will start at zero.
719 The zero is meaningless, so try to pick arbitrary addresses such
720 that no loadable sections overlap. This algorithm is quadratic,
721 but the number of sections in a single object file is generally
723 if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0)
725 struct place_section_arg arg;
726 bfd *abfd = objfile->obfd;
729 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
730 /* We do not expect this to happen; just skip this step if the
731 relocatable file has a section with an assigned VMA. */
732 if (bfd_section_vma (abfd, cur_sec) != 0)
737 CORE_ADDR *offsets = objfile->section_offsets->offsets;
739 /* Pick non-overlapping offsets for sections the user did not
741 arg.offsets = objfile->section_offsets;
743 bfd_map_over_sections (objfile->obfd, place_section, &arg);
745 /* Correctly filling in the section offsets is not quite
746 enough. Relocatable files have two properties that
747 (most) shared objects do not:
749 - Their debug information will contain relocations. Some
750 shared libraries do also, but many do not, so this can not
753 - If there are multiple code sections they will be loaded
754 at different relative addresses in memory than they are
755 in the objfile, since all sections in the file will start
758 Because GDB has very limited ability to map from an
759 address in debug info to the correct code section,
760 it relies on adding SECT_OFF_TEXT to things which might be
761 code. If we clear all the section offsets, and set the
762 section VMAs instead, then symfile_relocate_debug_section
763 will return meaningful debug information pointing at the
766 GDB has too many different data structures for section
767 addresses - a bfd, objfile, and so_list all have section
768 tables, as does exec_ops. Some of these could probably
771 for (cur_sec = abfd->sections; cur_sec != NULL;
772 cur_sec = cur_sec->next)
774 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
777 bfd_set_section_vma (abfd, cur_sec, offsets[cur_sec->index]);
778 exec_set_section_address (bfd_get_filename (abfd),
780 offsets[cur_sec->index]);
781 offsets[cur_sec->index] = 0;
786 /* Remember the bfd indexes for the .text, .data, .bss and
788 init_objfile_sect_indices (objfile);
791 /* Divide the file into segments, which are individual relocatable units.
792 This is the default version of the sym_fns.sym_segments function for
793 symbol readers that do not have an explicit representation of segments.
794 It assumes that object files do not have segments, and fully linked
795 files have a single segment. */
797 struct symfile_segment_data *
798 default_symfile_segments (bfd *abfd)
802 struct symfile_segment_data *data;
805 /* Relocatable files contain enough information to position each
806 loadable section independently; they should not be relocated
808 if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0)
811 /* Make sure there is at least one loadable section in the file. */
812 for (sect = abfd->sections; sect != NULL; sect = sect->next)
814 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
822 low = bfd_get_section_vma (abfd, sect);
823 high = low + bfd_get_section_size (sect);
825 data = XCNEW (struct symfile_segment_data);
826 data->num_segments = 1;
827 data->segment_bases = XCNEW (CORE_ADDR);
828 data->segment_sizes = XCNEW (CORE_ADDR);
830 num_sections = bfd_count_sections (abfd);
831 data->segment_info = XCNEWVEC (int, num_sections);
833 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
837 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
840 vma = bfd_get_section_vma (abfd, sect);
843 if (vma + bfd_get_section_size (sect) > high)
844 high = vma + bfd_get_section_size (sect);
846 data->segment_info[i] = 1;
849 data->segment_bases[0] = low;
850 data->segment_sizes[0] = high - low;
855 /* This is a convenience function to call sym_read for OBJFILE and
856 possibly force the partial symbols to be read. */
859 read_symbols (struct objfile *objfile, symfile_add_flags add_flags)
861 (*objfile->sf->sym_read) (objfile, add_flags);
862 objfile->per_bfd->minsyms_read = 1;
864 /* find_separate_debug_file_in_section should be called only if there is
865 single binary with no existing separate debug info file. */
866 if (!objfile_has_partial_symbols (objfile)
867 && objfile->separate_debug_objfile == NULL
868 && objfile->separate_debug_objfile_backlink == NULL)
870 gdb_bfd_ref_ptr abfd (find_separate_debug_file_in_section (objfile));
874 /* find_separate_debug_file_in_section uses the same filename for the
875 virtual section-as-bfd like the bfd filename containing the
876 section. Therefore use also non-canonical name form for the same
877 file containing the section. */
878 symbol_file_add_separate (abfd.get (), objfile->original_name,
882 if ((add_flags & SYMFILE_NO_READ) == 0)
883 require_partial_symbols (objfile, 0);
886 /* Initialize entry point information for this objfile. */
889 init_entry_point_info (struct objfile *objfile)
891 struct entry_info *ei = &objfile->per_bfd->ei;
897 /* Save startup file's range of PC addresses to help blockframe.c
898 decide where the bottom of the stack is. */
900 if (bfd_get_file_flags (objfile->obfd) & EXEC_P)
902 /* Executable file -- record its entry point so we'll recognize
903 the startup file because it contains the entry point. */
904 ei->entry_point = bfd_get_start_address (objfile->obfd);
905 ei->entry_point_p = 1;
907 else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC
908 && bfd_get_start_address (objfile->obfd) != 0)
910 /* Some shared libraries may have entry points set and be
911 runnable. There's no clear way to indicate this, so just check
912 for values other than zero. */
913 ei->entry_point = bfd_get_start_address (objfile->obfd);
914 ei->entry_point_p = 1;
918 /* Examination of non-executable.o files. Short-circuit this stuff. */
919 ei->entry_point_p = 0;
922 if (ei->entry_point_p)
924 struct obj_section *osect;
925 CORE_ADDR entry_point = ei->entry_point;
928 /* Make certain that the address points at real code, and not a
929 function descriptor. */
931 = gdbarch_convert_from_func_ptr_addr (get_objfile_arch (objfile),
935 /* Remove any ISA markers, so that this matches entries in the
938 = gdbarch_addr_bits_remove (get_objfile_arch (objfile), entry_point);
941 ALL_OBJFILE_OSECTIONS (objfile, osect)
943 struct bfd_section *sect = osect->the_bfd_section;
945 if (entry_point >= bfd_get_section_vma (objfile->obfd, sect)
946 && entry_point < (bfd_get_section_vma (objfile->obfd, sect)
947 + bfd_get_section_size (sect)))
949 ei->the_bfd_section_index
950 = gdb_bfd_section_index (objfile->obfd, sect);
957 ei->the_bfd_section_index = SECT_OFF_TEXT (objfile);
961 /* Process a symbol file, as either the main file or as a dynamically
964 This function does not set the OBJFILE's entry-point info.
966 OBJFILE is where the symbols are to be read from.
968 ADDRS is the list of section load addresses. If the user has given
969 an 'add-symbol-file' command, then this is the list of offsets and
970 addresses he or she provided as arguments to the command; or, if
971 we're handling a shared library, these are the actual addresses the
972 sections are loaded at, according to the inferior's dynamic linker
973 (as gleaned by GDB's shared library code). We convert each address
974 into an offset from the section VMA's as it appears in the object
975 file, and then call the file's sym_offsets function to convert this
976 into a format-specific offset table --- a `struct section_offsets'.
978 ADD_FLAGS encodes verbosity level, whether this is main symbol or
979 an extra symbol file such as dynamically loaded code, and wether
980 breakpoint reset should be deferred. */
983 syms_from_objfile_1 (struct objfile *objfile,
984 struct section_addr_info *addrs,
985 symfile_add_flags add_flags)
987 struct section_addr_info *local_addr = NULL;
988 struct cleanup *old_chain;
989 const int mainline = add_flags & SYMFILE_MAINLINE;
991 objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd));
993 if (objfile->sf == NULL)
995 /* No symbols to load, but we still need to make sure
996 that the section_offsets table is allocated. */
997 int num_sections = gdb_bfd_count_sections (objfile->obfd);
998 size_t size = SIZEOF_N_SECTION_OFFSETS (num_sections);
1000 objfile->num_sections = num_sections;
1001 objfile->section_offsets
1002 = (struct section_offsets *) obstack_alloc (&objfile->objfile_obstack,
1004 memset (objfile->section_offsets, 0, size);
1008 /* Make sure that partially constructed symbol tables will be cleaned up
1009 if an error occurs during symbol reading. */
1010 old_chain = make_cleanup_free_objfile (objfile);
1012 /* If ADDRS is NULL, put together a dummy address list.
1013 We now establish the convention that an addr of zero means
1014 no load address was specified. */
1017 local_addr = alloc_section_addr_info (1);
1018 make_cleanup (xfree, local_addr);
1024 /* We will modify the main symbol table, make sure that all its users
1025 will be cleaned up if an error occurs during symbol reading. */
1026 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);
1028 /* Since no error yet, throw away the old symbol table. */
1030 if (symfile_objfile != NULL)
1032 free_objfile (symfile_objfile);
1033 gdb_assert (symfile_objfile == NULL);
1036 /* Currently we keep symbols from the add-symbol-file command.
1037 If the user wants to get rid of them, they should do "symbol-file"
1038 without arguments first. Not sure this is the best behavior
1041 (*objfile->sf->sym_new_init) (objfile);
1044 /* Convert addr into an offset rather than an absolute address.
1045 We find the lowest address of a loaded segment in the objfile,
1046 and assume that <addr> is where that got loaded.
1048 We no longer warn if the lowest section is not a text segment (as
1049 happens for the PA64 port. */
1050 if (addrs->num_sections > 0)
1051 addr_info_make_relative (addrs, objfile->obfd);
1053 /* Initialize symbol reading routines for this objfile, allow complaints to
1054 appear for this new file, and record how verbose to be, then do the
1055 initial symbol reading for this file. */
1057 (*objfile->sf->sym_init) (objfile);
1058 clear_complaints (&symfile_complaints, 1, add_flags & SYMFILE_VERBOSE);
1060 (*objfile->sf->sym_offsets) (objfile, addrs);
1062 read_symbols (objfile, add_flags);
1064 /* Discard cleanups as symbol reading was successful. */
1066 discard_cleanups (old_chain);
1070 /* Same as syms_from_objfile_1, but also initializes the objfile
1071 entry-point info. */
1074 syms_from_objfile (struct objfile *objfile,
1075 struct section_addr_info *addrs,
1076 symfile_add_flags add_flags)
1078 syms_from_objfile_1 (objfile, addrs, add_flags);
1079 init_entry_point_info (objfile);
1082 /* Perform required actions after either reading in the initial
1083 symbols for a new objfile, or mapping in the symbols from a reusable
1084 objfile. ADD_FLAGS is a bitmask of enum symfile_add_flags. */
1087 finish_new_objfile (struct objfile *objfile, symfile_add_flags add_flags)
1089 /* If this is the main symbol file we have to clean up all users of the
1090 old main symbol file. Otherwise it is sufficient to fixup all the
1091 breakpoints that may have been redefined by this symbol file. */
1092 if (add_flags & SYMFILE_MAINLINE)
1094 /* OK, make it the "real" symbol file. */
1095 symfile_objfile = objfile;
1097 clear_symtab_users (add_flags);
1099 else if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0)
1101 breakpoint_re_set ();
1104 /* We're done reading the symbol file; finish off complaints. */
1105 clear_complaints (&symfile_complaints, 0, add_flags & SYMFILE_VERBOSE);
1108 /* Process a symbol file, as either the main file or as a dynamically
1111 ABFD is a BFD already open on the file, as from symfile_bfd_open.
1112 A new reference is acquired by this function.
1114 For NAME description see allocate_objfile's definition.
1116 ADD_FLAGS encodes verbosity, whether this is main symbol file or
1117 extra, such as dynamically loaded code, and what to do with breakpoins.
1119 ADDRS is as described for syms_from_objfile_1, above.
1120 ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS.
1122 PARENT is the original objfile if ABFD is a separate debug info file.
1123 Otherwise PARENT is NULL.
1125 Upon success, returns a pointer to the objfile that was added.
1126 Upon failure, jumps back to command level (never returns). */
1128 static struct objfile *
1129 symbol_file_add_with_addrs (bfd *abfd, const char *name,
1130 symfile_add_flags add_flags,
1131 struct section_addr_info *addrs,
1132 objfile_flags flags, struct objfile *parent)
1134 struct objfile *objfile;
1135 const int from_tty = add_flags & SYMFILE_VERBOSE;
1136 const int mainline = add_flags & SYMFILE_MAINLINE;
1137 const int should_print = (print_symbol_loading_p (from_tty, mainline, 1)
1138 && (readnow_symbol_files
1139 || (add_flags & SYMFILE_NO_READ) == 0));
1141 if (readnow_symbol_files)
1143 flags |= OBJF_READNOW;
1144 add_flags &= ~SYMFILE_NO_READ;
1147 /* Give user a chance to burp if we'd be
1148 interactively wiping out any existing symbols. */
1150 if ((have_full_symbols () || have_partial_symbols ())
1153 && !query (_("Load new symbol table from \"%s\"? "), name))
1154 error (_("Not confirmed."));
1157 flags |= OBJF_MAINLINE;
1158 objfile = allocate_objfile (abfd, name, flags);
1161 add_separate_debug_objfile (objfile, parent);
1163 /* We either created a new mapped symbol table, mapped an existing
1164 symbol table file which has not had initial symbol reading
1165 performed, or need to read an unmapped symbol table. */
1168 if (deprecated_pre_add_symbol_hook)
1169 deprecated_pre_add_symbol_hook (name);
1172 printf_unfiltered (_("Reading symbols from %s..."), name);
1174 gdb_flush (gdb_stdout);
1177 syms_from_objfile (objfile, addrs, add_flags);
1179 /* We now have at least a partial symbol table. Check to see if the
1180 user requested that all symbols be read on initial access via either
1181 the gdb startup command line or on a per symbol file basis. Expand
1182 all partial symbol tables for this objfile if so. */
1184 if ((flags & OBJF_READNOW))
1188 printf_unfiltered (_("expanding to full symbols..."));
1190 gdb_flush (gdb_stdout);
1194 objfile->sf->qf->expand_all_symtabs (objfile);
1197 if (should_print && !objfile_has_symbols (objfile))
1200 printf_unfiltered (_("(no debugging symbols found)..."));
1206 if (deprecated_post_add_symbol_hook)
1207 deprecated_post_add_symbol_hook ();
1209 printf_unfiltered (_("done.\n"));
1212 /* We print some messages regardless of whether 'from_tty ||
1213 info_verbose' is true, so make sure they go out at the right
1215 gdb_flush (gdb_stdout);
1217 if (objfile->sf == NULL)
1219 observer_notify_new_objfile (objfile);
1220 return objfile; /* No symbols. */
1223 finish_new_objfile (objfile, add_flags);
1225 observer_notify_new_objfile (objfile);
1227 bfd_cache_close_all ();
1231 /* Add BFD as a separate debug file for OBJFILE. For NAME description
1232 see allocate_objfile's definition. */
1235 symbol_file_add_separate (bfd *bfd, const char *name,
1236 symfile_add_flags symfile_flags,
1237 struct objfile *objfile)
1239 struct section_addr_info *sap;
1240 struct cleanup *my_cleanup;
1242 /* Create section_addr_info. We can't directly use offsets from OBJFILE
1243 because sections of BFD may not match sections of OBJFILE and because
1244 vma may have been modified by tools such as prelink. */
1245 sap = build_section_addr_info_from_objfile (objfile);
1246 my_cleanup = make_cleanup_free_section_addr_info (sap);
1248 symbol_file_add_with_addrs
1249 (bfd, name, symfile_flags, sap,
1250 objfile->flags & (OBJF_REORDERED | OBJF_SHARED | OBJF_READNOW
1254 do_cleanups (my_cleanup);
1257 /* Process the symbol file ABFD, as either the main file or as a
1258 dynamically loaded file.
1259 See symbol_file_add_with_addrs's comments for details. */
1262 symbol_file_add_from_bfd (bfd *abfd, const char *name,
1263 symfile_add_flags add_flags,
1264 struct section_addr_info *addrs,
1265 objfile_flags flags, struct objfile *parent)
1267 return symbol_file_add_with_addrs (abfd, name, add_flags, addrs, flags,
1271 /* Process a symbol file, as either the main file or as a dynamically
1272 loaded file. See symbol_file_add_with_addrs's comments for details. */
1275 symbol_file_add (const char *name, symfile_add_flags add_flags,
1276 struct section_addr_info *addrs, objfile_flags flags)
1278 gdb_bfd_ref_ptr bfd (symfile_bfd_open (name));
1280 return symbol_file_add_from_bfd (bfd.get (), name, add_flags, addrs,
1284 /* Call symbol_file_add() with default values and update whatever is
1285 affected by the loading of a new main().
1286 Used when the file is supplied in the gdb command line
1287 and by some targets with special loading requirements.
1288 The auxiliary function, symbol_file_add_main_1(), has the flags
1289 argument for the switches that can only be specified in the symbol_file
1293 symbol_file_add_main (const char *args, symfile_add_flags add_flags)
1295 symbol_file_add_main_1 (args, add_flags, 0);
1299 symbol_file_add_main_1 (const char *args, symfile_add_flags add_flags,
1300 objfile_flags flags)
1302 add_flags |= current_inferior ()->symfile_flags | SYMFILE_MAINLINE;
1304 symbol_file_add (args, add_flags, NULL, flags);
1306 /* Getting new symbols may change our opinion about
1307 what is frameless. */
1308 reinit_frame_cache ();
1310 if ((add_flags & SYMFILE_NO_READ) == 0)
1311 set_initial_language ();
1315 symbol_file_clear (int from_tty)
1317 if ((have_full_symbols () || have_partial_symbols ())
1320 ? !query (_("Discard symbol table from `%s'? "),
1321 objfile_name (symfile_objfile))
1322 : !query (_("Discard symbol table? "))))
1323 error (_("Not confirmed."));
1325 /* solib descriptors may have handles to objfiles. Wipe them before their
1326 objfiles get stale by free_all_objfiles. */
1327 no_shared_libraries (NULL, from_tty);
1329 free_all_objfiles ();
1331 gdb_assert (symfile_objfile == NULL);
1333 printf_unfiltered (_("No symbol file now.\n"));
1337 separate_debug_file_exists (const char *name, unsigned long crc,
1338 struct objfile *parent_objfile)
1340 unsigned long file_crc;
1342 struct stat parent_stat, abfd_stat;
1343 int verified_as_different;
1345 /* Find a separate debug info file as if symbols would be present in
1346 PARENT_OBJFILE itself this function would not be called. .gnu_debuglink
1347 section can contain just the basename of PARENT_OBJFILE without any
1348 ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where
1349 the separate debug infos with the same basename can exist. */
1351 if (filename_cmp (name, objfile_name (parent_objfile)) == 0)
1354 gdb_bfd_ref_ptr abfd (gdb_bfd_open (name, gnutarget, -1));
1359 /* Verify symlinks were not the cause of filename_cmp name difference above.
1361 Some operating systems, e.g. Windows, do not provide a meaningful
1362 st_ino; they always set it to zero. (Windows does provide a
1363 meaningful st_dev.) Files accessed from gdbservers that do not
1364 support the vFile:fstat packet will also have st_ino set to zero.
1365 Do not indicate a duplicate library in either case. While there
1366 is no guarantee that a system that provides meaningful inode
1367 numbers will never set st_ino to zero, this is merely an
1368 optimization, so we do not need to worry about false negatives. */
1370 if (bfd_stat (abfd.get (), &abfd_stat) == 0
1371 && abfd_stat.st_ino != 0
1372 && bfd_stat (parent_objfile->obfd, &parent_stat) == 0)
1374 if (abfd_stat.st_dev == parent_stat.st_dev
1375 && abfd_stat.st_ino == parent_stat.st_ino)
1377 verified_as_different = 1;
1380 verified_as_different = 0;
1382 file_crc_p = gdb_bfd_crc (abfd.get (), &file_crc);
1387 if (crc != file_crc)
1389 unsigned long parent_crc;
1391 /* If the files could not be verified as different with
1392 bfd_stat then we need to calculate the parent's CRC
1393 to verify whether the files are different or not. */
1395 if (!verified_as_different)
1397 if (!gdb_bfd_crc (parent_objfile->obfd, &parent_crc))
1401 if (verified_as_different || parent_crc != file_crc)
1402 warning (_("the debug information found in \"%s\""
1403 " does not match \"%s\" (CRC mismatch).\n"),
1404 name, objfile_name (parent_objfile));
1412 char *debug_file_directory = NULL;
1414 show_debug_file_directory (struct ui_file *file, int from_tty,
1415 struct cmd_list_element *c, const char *value)
1417 fprintf_filtered (file,
1418 _("The directory where separate debug "
1419 "symbols are searched for is \"%s\".\n"),
1423 #if ! defined (DEBUG_SUBDIRECTORY)
1424 #define DEBUG_SUBDIRECTORY ".debug"
1427 /* Find a separate debuginfo file for OBJFILE, using DIR as the directory
1428 where the original file resides (may not be the same as
1429 dirname(objfile->name) due to symlinks), and DEBUGLINK as the file we are
1430 looking for. CANON_DIR is the "realpath" form of DIR.
1431 DIR must contain a trailing '/'.
1432 Returns the path of the file with separate debug info, of NULL. */
1435 find_separate_debug_file (const char *dir,
1436 const char *canon_dir,
1437 const char *debuglink,
1438 unsigned long crc32, struct objfile *objfile)
1443 VEC (char_ptr) *debugdir_vec;
1444 struct cleanup *back_to;
1447 /* Set I to std::max (strlen (canon_dir), strlen (dir)). */
1449 if (canon_dir != NULL && strlen (canon_dir) > i)
1450 i = strlen (canon_dir);
1453 = (char *) xmalloc (strlen (debug_file_directory) + 1
1455 + strlen (DEBUG_SUBDIRECTORY)
1457 + strlen (debuglink)
1460 /* First try in the same directory as the original file. */
1461 strcpy (debugfile, dir);
1462 strcat (debugfile, debuglink);
1464 if (separate_debug_file_exists (debugfile, crc32, objfile))
1467 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */
1468 strcpy (debugfile, dir);
1469 strcat (debugfile, DEBUG_SUBDIRECTORY);
1470 strcat (debugfile, "/");
1471 strcat (debugfile, debuglink);
1473 if (separate_debug_file_exists (debugfile, crc32, objfile))
1476 /* Then try in the global debugfile directories.
1478 Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
1479 cause "/..." lookups. */
1481 debugdir_vec = dirnames_to_char_ptr_vec (debug_file_directory);
1482 back_to = make_cleanup_free_char_ptr_vec (debugdir_vec);
1484 for (ix = 0; VEC_iterate (char_ptr, debugdir_vec, ix, debugdir); ++ix)
1486 strcpy (debugfile, debugdir);
1487 strcat (debugfile, "/");
1488 strcat (debugfile, dir);
1489 strcat (debugfile, debuglink);
1491 if (separate_debug_file_exists (debugfile, crc32, objfile))
1493 do_cleanups (back_to);
1497 /* If the file is in the sysroot, try using its base path in the
1498 global debugfile directory. */
1499 if (canon_dir != NULL
1500 && filename_ncmp (canon_dir, gdb_sysroot,
1501 strlen (gdb_sysroot)) == 0
1502 && IS_DIR_SEPARATOR (canon_dir[strlen (gdb_sysroot)]))
1504 strcpy (debugfile, debugdir);
1505 strcat (debugfile, canon_dir + strlen (gdb_sysroot));
1506 strcat (debugfile, "/");
1507 strcat (debugfile, debuglink);
1509 if (separate_debug_file_exists (debugfile, crc32, objfile))
1511 do_cleanups (back_to);
1517 do_cleanups (back_to);
1522 /* Modify PATH to contain only "[/]directory/" part of PATH.
1523 If there were no directory separators in PATH, PATH will be empty
1524 string on return. */
1527 terminate_after_last_dir_separator (char *path)
1531 /* Strip off the final filename part, leaving the directory name,
1532 followed by a slash. The directory can be relative or absolute. */
1533 for (i = strlen(path) - 1; i >= 0; i--)
1534 if (IS_DIR_SEPARATOR (path[i]))
1537 /* If I is -1 then no directory is present there and DIR will be "". */
1541 /* Find separate debuginfo for OBJFILE (using .gnu_debuglink section).
1542 Returns pathname, or NULL. */
1545 find_separate_debug_file_by_debuglink (struct objfile *objfile)
1548 char *dir, *canon_dir;
1550 unsigned long crc32;
1551 struct cleanup *cleanups;
1553 debuglink = bfd_get_debug_link_info (objfile->obfd, &crc32);
1555 if (debuglink == NULL)
1557 /* There's no separate debug info, hence there's no way we could
1558 load it => no warning. */
1562 cleanups = make_cleanup (xfree, debuglink);
1563 dir = xstrdup (objfile_name (objfile));
1564 make_cleanup (xfree, dir);
1565 terminate_after_last_dir_separator (dir);
1566 canon_dir = lrealpath (dir);
1568 debugfile = find_separate_debug_file (dir, canon_dir, debuglink,
1572 if (debugfile == NULL)
1574 /* For PR gdb/9538, try again with realpath (if different from the
1579 if (lstat (objfile_name (objfile), &st_buf) == 0
1580 && S_ISLNK (st_buf.st_mode))
1584 symlink_dir = lrealpath (objfile_name (objfile));
1585 if (symlink_dir != NULL)
1587 make_cleanup (xfree, symlink_dir);
1588 terminate_after_last_dir_separator (symlink_dir);
1589 if (strcmp (dir, symlink_dir) != 0)
1591 /* Different directory, so try using it. */
1592 debugfile = find_separate_debug_file (symlink_dir,
1602 do_cleanups (cleanups);
1606 /* This is the symbol-file command. Read the file, analyze its
1607 symbols, and add a struct symtab to a symtab list. The syntax of
1608 the command is rather bizarre:
1610 1. The function buildargv implements various quoting conventions
1611 which are undocumented and have little or nothing in common with
1612 the way things are quoted (or not quoted) elsewhere in GDB.
1614 2. Options are used, which are not generally used in GDB (perhaps
1615 "set mapped on", "set readnow on" would be better)
1617 3. The order of options matters, which is contrary to GNU
1618 conventions (because it is confusing and inconvenient). */
1621 symbol_file_command (char *args, int from_tty)
1627 symbol_file_clear (from_tty);
1631 char **argv = gdb_buildargv (args);
1632 objfile_flags flags = OBJF_USERLOADED;
1633 symfile_add_flags add_flags = 0;
1634 struct cleanup *cleanups;
1638 add_flags |= SYMFILE_VERBOSE;
1640 cleanups = make_cleanup_freeargv (argv);
1641 while (*argv != NULL)
1643 if (strcmp (*argv, "-readnow") == 0)
1644 flags |= OBJF_READNOW;
1645 else if (**argv == '-')
1646 error (_("unknown option `%s'"), *argv);
1649 symbol_file_add_main_1 (*argv, add_flags, flags);
1657 error (_("no symbol file name was specified"));
1659 do_cleanups (cleanups);
1663 /* Set the initial language.
1665 FIXME: A better solution would be to record the language in the
1666 psymtab when reading partial symbols, and then use it (if known) to
1667 set the language. This would be a win for formats that encode the
1668 language in an easily discoverable place, such as DWARF. For
1669 stabs, we can jump through hoops looking for specially named
1670 symbols or try to intuit the language from the specific type of
1671 stabs we find, but we can't do that until later when we read in
1675 set_initial_language (void)
1677 enum language lang = main_language ();
1679 if (lang == language_unknown)
1681 char *name = main_name ();
1682 struct symbol *sym = lookup_symbol (name, NULL, VAR_DOMAIN, NULL).symbol;
1685 lang = SYMBOL_LANGUAGE (sym);
1688 if (lang == language_unknown)
1690 /* Make C the default language */
1694 set_language (lang);
1695 expected_language = current_language; /* Don't warn the user. */
1698 /* Open the file specified by NAME and hand it off to BFD for
1699 preliminary analysis. Return a newly initialized bfd *, which
1700 includes a newly malloc'd` copy of NAME (tilde-expanded and made
1701 absolute). In case of trouble, error() is called. */
1704 symfile_bfd_open (const char *name)
1707 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
1709 if (!is_target_filename (name))
1711 char *expanded_name, *absolute_name;
1713 expanded_name = tilde_expand (name); /* Returns 1st new malloc'd copy. */
1715 /* Look down path for it, allocate 2nd new malloc'd copy. */
1716 desc = openp (getenv ("PATH"),
1717 OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
1718 expanded_name, O_RDONLY | O_BINARY, &absolute_name);
1719 #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__)
1722 char *exename = (char *) alloca (strlen (expanded_name) + 5);
1724 strcat (strcpy (exename, expanded_name), ".exe");
1725 desc = openp (getenv ("PATH"),
1726 OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
1727 exename, O_RDONLY | O_BINARY, &absolute_name);
1732 make_cleanup (xfree, expanded_name);
1733 perror_with_name (expanded_name);
1736 xfree (expanded_name);
1737 make_cleanup (xfree, absolute_name);
1738 name = absolute_name;
1741 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (name, gnutarget, desc));
1742 if (sym_bfd == NULL)
1743 error (_("`%s': can't open to read symbols: %s."), name,
1744 bfd_errmsg (bfd_get_error ()));
1746 if (!gdb_bfd_has_target_filename (sym_bfd.get ()))
1747 bfd_set_cacheable (sym_bfd.get (), 1);
1749 if (!bfd_check_format (sym_bfd.get (), bfd_object))
1750 error (_("`%s': can't read symbols: %s."), name,
1751 bfd_errmsg (bfd_get_error ()));
1753 do_cleanups (back_to);
1758 /* Return the section index for SECTION_NAME on OBJFILE. Return -1 if
1759 the section was not found. */
1762 get_section_index (struct objfile *objfile, const char *section_name)
1764 asection *sect = bfd_get_section_by_name (objfile->obfd, section_name);
1772 /* Link SF into the global symtab_fns list.
1773 FLAVOUR is the file format that SF handles.
1774 Called on startup by the _initialize routine in each object file format
1775 reader, to register information about each format the reader is prepared
1779 add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *sf)
1781 registered_sym_fns fns = { flavour, sf };
1783 VEC_safe_push (registered_sym_fns, symtab_fns, &fns);
1786 /* Initialize OBJFILE to read symbols from its associated BFD. It
1787 either returns or calls error(). The result is an initialized
1788 struct sym_fns in the objfile structure, that contains cached
1789 information about the symbol file. */
1791 static const struct sym_fns *
1792 find_sym_fns (bfd *abfd)
1794 registered_sym_fns *rsf;
1795 enum bfd_flavour our_flavour = bfd_get_flavour (abfd);
1798 if (our_flavour == bfd_target_srec_flavour
1799 || our_flavour == bfd_target_ihex_flavour
1800 || our_flavour == bfd_target_tekhex_flavour)
1801 return NULL; /* No symbols. */
1803 for (i = 0; VEC_iterate (registered_sym_fns, symtab_fns, i, rsf); ++i)
1804 if (our_flavour == rsf->sym_flavour)
1805 return rsf->sym_fns;
1807 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."),
1808 bfd_get_target (abfd));
1812 /* This function runs the load command of our current target. */
1815 load_command (char *arg, int from_tty)
1817 struct cleanup *cleanup = make_cleanup (null_cleanup, NULL);
1821 /* The user might be reloading because the binary has changed. Take
1822 this opportunity to check. */
1823 reopen_exec_file ();
1831 parg = arg = get_exec_file (1);
1833 /* Count how many \ " ' tab space there are in the name. */
1834 while ((parg = strpbrk (parg, "\\\"'\t ")))
1842 /* We need to quote this string so buildargv can pull it apart. */
1843 char *temp = (char *) xmalloc (strlen (arg) + count + 1 );
1847 make_cleanup (xfree, temp);
1850 while ((parg = strpbrk (parg, "\\\"'\t ")))
1852 strncpy (ptemp, prev, parg - prev);
1853 ptemp += parg - prev;
1857 strcpy (ptemp, prev);
1863 target_load (arg, from_tty);
1865 /* After re-loading the executable, we don't really know which
1866 overlays are mapped any more. */
1867 overlay_cache_invalid = 1;
1869 do_cleanups (cleanup);
1872 /* This version of "load" should be usable for any target. Currently
1873 it is just used for remote targets, not inftarg.c or core files,
1874 on the theory that only in that case is it useful.
1876 Avoiding xmodem and the like seems like a win (a) because we don't have
1877 to worry about finding it, and (b) On VMS, fork() is very slow and so
1878 we don't want to run a subprocess. On the other hand, I'm not sure how
1879 performance compares. */
1881 static int validate_download = 0;
1883 /* Callback service function for generic_load (bfd_map_over_sections). */
1886 add_section_size_callback (bfd *abfd, asection *asec, void *data)
1888 bfd_size_type *sum = (bfd_size_type *) data;
1890 *sum += bfd_get_section_size (asec);
1893 /* Opaque data for load_section_callback. */
1894 struct load_section_data {
1895 CORE_ADDR load_offset;
1896 struct load_progress_data *progress_data;
1897 VEC(memory_write_request_s) *requests;
1900 /* Opaque data for load_progress. */
1901 struct load_progress_data {
1902 /* Cumulative data. */
1903 unsigned long write_count;
1904 unsigned long data_count;
1905 bfd_size_type total_size;
1908 /* Opaque data for load_progress for a single section. */
1909 struct load_progress_section_data {
1910 struct load_progress_data *cumulative;
1912 /* Per-section data. */
1913 const char *section_name;
1914 ULONGEST section_sent;
1915 ULONGEST section_size;
1920 /* Target write callback routine for progress reporting. */
1923 load_progress (ULONGEST bytes, void *untyped_arg)
1925 struct load_progress_section_data *args
1926 = (struct load_progress_section_data *) untyped_arg;
1927 struct load_progress_data *totals;
1930 /* Writing padding data. No easy way to get at the cumulative
1931 stats, so just ignore this. */
1934 totals = args->cumulative;
1936 if (bytes == 0 && args->section_sent == 0)
1938 /* The write is just starting. Let the user know we've started
1940 current_uiout->message ("Loading section %s, size %s lma %s\n",
1942 hex_string (args->section_size),
1943 paddress (target_gdbarch (), args->lma));
1947 if (validate_download)
1949 /* Broken memories and broken monitors manifest themselves here
1950 when bring new computers to life. This doubles already slow
1952 /* NOTE: cagney/1999-10-18: A more efficient implementation
1953 might add a verify_memory() method to the target vector and
1954 then use that. remote.c could implement that method using
1955 the ``qCRC'' packet. */
1956 gdb_byte *check = (gdb_byte *) xmalloc (bytes);
1957 struct cleanup *verify_cleanups = make_cleanup (xfree, check);
1959 if (target_read_memory (args->lma, check, bytes) != 0)
1960 error (_("Download verify read failed at %s"),
1961 paddress (target_gdbarch (), args->lma));
1962 if (memcmp (args->buffer, check, bytes) != 0)
1963 error (_("Download verify compare failed at %s"),
1964 paddress (target_gdbarch (), args->lma));
1965 do_cleanups (verify_cleanups);
1967 totals->data_count += bytes;
1969 args->buffer += bytes;
1970 totals->write_count += 1;
1971 args->section_sent += bytes;
1972 if (check_quit_flag ()
1973 || (deprecated_ui_load_progress_hook != NULL
1974 && deprecated_ui_load_progress_hook (args->section_name,
1975 args->section_sent)))
1976 error (_("Canceled the download"));
1978 if (deprecated_show_load_progress != NULL)
1979 deprecated_show_load_progress (args->section_name,
1983 totals->total_size);
1986 /* Callback service function for generic_load (bfd_map_over_sections). */
1989 load_section_callback (bfd *abfd, asection *asec, void *data)
1991 struct memory_write_request *new_request;
1992 struct load_section_data *args = (struct load_section_data *) data;
1993 struct load_progress_section_data *section_data;
1994 bfd_size_type size = bfd_get_section_size (asec);
1996 const char *sect_name = bfd_get_section_name (abfd, asec);
1998 if ((bfd_get_section_flags (abfd, asec) & SEC_LOAD) == 0)
2004 new_request = VEC_safe_push (memory_write_request_s,
2005 args->requests, NULL);
2006 memset (new_request, 0, sizeof (struct memory_write_request));
2007 section_data = XCNEW (struct load_progress_section_data);
2008 new_request->begin = bfd_section_lma (abfd, asec) + args->load_offset;
2009 new_request->end = new_request->begin + size; /* FIXME Should size
2011 new_request->data = (gdb_byte *) xmalloc (size);
2012 new_request->baton = section_data;
2014 buffer = new_request->data;
2016 section_data->cumulative = args->progress_data;
2017 section_data->section_name = sect_name;
2018 section_data->section_size = size;
2019 section_data->lma = new_request->begin;
2020 section_data->buffer = buffer;
2022 bfd_get_section_contents (abfd, asec, buffer, 0, size);
2025 /* Clean up an entire memory request vector, including load
2026 data and progress records. */
2029 clear_memory_write_data (void *arg)
2031 VEC(memory_write_request_s) **vec_p = (VEC(memory_write_request_s) **) arg;
2032 VEC(memory_write_request_s) *vec = *vec_p;
2034 struct memory_write_request *mr;
2036 for (i = 0; VEC_iterate (memory_write_request_s, vec, i, mr); ++i)
2041 VEC_free (memory_write_request_s, vec);
2044 static void print_transfer_performance (struct ui_file *stream,
2045 unsigned long data_count,
2046 unsigned long write_count,
2047 std::chrono::steady_clock::duration d);
2050 generic_load (const char *args, int from_tty)
2053 struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0);
2054 struct load_section_data cbdata;
2055 struct load_progress_data total_progress;
2056 struct ui_out *uiout = current_uiout;
2061 memset (&cbdata, 0, sizeof (cbdata));
2062 memset (&total_progress, 0, sizeof (total_progress));
2063 cbdata.progress_data = &total_progress;
2065 make_cleanup (clear_memory_write_data, &cbdata.requests);
2068 error_no_arg (_("file to load"));
2070 argv = gdb_buildargv (args);
2071 make_cleanup_freeargv (argv);
2073 filename = tilde_expand (argv[0]);
2074 make_cleanup (xfree, filename);
2076 if (argv[1] != NULL)
2080 cbdata.load_offset = strtoulst (argv[1], &endptr, 0);
2082 /* If the last word was not a valid number then
2083 treat it as a file name with spaces in. */
2084 if (argv[1] == endptr)
2085 error (_("Invalid download offset:%s."), argv[1]);
2087 if (argv[2] != NULL)
2088 error (_("Too many parameters."));
2091 /* Open the file for loading. */
2092 gdb_bfd_ref_ptr loadfile_bfd (gdb_bfd_open (filename, gnutarget, -1));
2093 if (loadfile_bfd == NULL)
2095 perror_with_name (filename);
2099 if (!bfd_check_format (loadfile_bfd.get (), bfd_object))
2101 error (_("\"%s\" is not an object file: %s"), filename,
2102 bfd_errmsg (bfd_get_error ()));
2105 bfd_map_over_sections (loadfile_bfd.get (), add_section_size_callback,
2106 (void *) &total_progress.total_size);
2108 bfd_map_over_sections (loadfile_bfd.get (), load_section_callback, &cbdata);
2110 using namespace std::chrono;
2112 steady_clock::time_point start_time = steady_clock::now ();
2114 if (target_write_memory_blocks (cbdata.requests, flash_discard,
2115 load_progress) != 0)
2116 error (_("Load failed"));
2118 steady_clock::time_point end_time = steady_clock::now ();
2120 entry = bfd_get_start_address (loadfile_bfd.get ());
2121 entry = gdbarch_addr_bits_remove (target_gdbarch (), entry);
2122 uiout->text ("Start address ");
2123 uiout->field_fmt ("address", "%s", paddress (target_gdbarch (), entry));
2124 uiout->text (", load size ");
2125 uiout->field_fmt ("load-size", "%lu", total_progress.data_count);
2127 regcache_write_pc (get_current_regcache (), entry);
2129 /* Reset breakpoints, now that we have changed the load image. For
2130 instance, breakpoints may have been set (or reset, by
2131 post_create_inferior) while connected to the target but before we
2132 loaded the program. In that case, the prologue analyzer could
2133 have read instructions from the target to find the right
2134 breakpoint locations. Loading has changed the contents of that
2137 breakpoint_re_set ();
2139 print_transfer_performance (gdb_stdout, total_progress.data_count,
2140 total_progress.write_count,
2141 end_time - start_time);
2143 do_cleanups (old_cleanups);
2146 /* Report on STREAM the performance of a memory transfer operation,
2147 such as 'load'. DATA_COUNT is the number of bytes transferred.
2148 WRITE_COUNT is the number of separate write operations, or 0, if
2149 that information is not available. TIME is how long the operation
2153 print_transfer_performance (struct ui_file *stream,
2154 unsigned long data_count,
2155 unsigned long write_count,
2156 std::chrono::steady_clock::duration time)
2158 using namespace std::chrono;
2159 struct ui_out *uiout = current_uiout;
2161 milliseconds ms = duration_cast<milliseconds> (time);
2163 uiout->text ("Transfer rate: ");
2164 if (ms.count () > 0)
2166 unsigned long rate = ((ULONGEST) data_count * 1000) / ms.count ();
2168 if (uiout->is_mi_like_p ())
2170 uiout->field_fmt ("transfer-rate", "%lu", rate * 8);
2171 uiout->text (" bits/sec");
2173 else if (rate < 1024)
2175 uiout->field_fmt ("transfer-rate", "%lu", rate);
2176 uiout->text (" bytes/sec");
2180 uiout->field_fmt ("transfer-rate", "%lu", rate / 1024);
2181 uiout->text (" KB/sec");
2186 uiout->field_fmt ("transferred-bits", "%lu", (data_count * 8));
2187 uiout->text (" bits in <1 sec");
2189 if (write_count > 0)
2192 uiout->field_fmt ("write-rate", "%lu", data_count / write_count);
2193 uiout->text (" bytes/write");
2195 uiout->text (".\n");
2198 /* This function allows the addition of incrementally linked object files.
2199 It does not modify any state in the target, only in the debugger. */
2200 /* Note: ezannoni 2000-04-13 This function/command used to have a
2201 special case syntax for the rombug target (Rombug is the boot
2202 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the
2203 rombug case, the user doesn't need to supply a text address,
2204 instead a call to target_link() (in target.c) would supply the
2205 value to use. We are now discontinuing this type of ad hoc syntax. */
2208 add_symbol_file_command (char *args, int from_tty)
2210 struct gdbarch *gdbarch = get_current_arch ();
2211 char *filename = NULL;
2213 int section_index = 0;
2217 int expecting_sec_name = 0;
2218 int expecting_sec_addr = 0;
2220 struct objfile *objf;
2221 objfile_flags flags = OBJF_USERLOADED | OBJF_SHARED;
2222 symfile_add_flags add_flags = 0;
2225 add_flags |= SYMFILE_VERBOSE;
2233 struct section_addr_info *section_addrs;
2234 struct sect_opt *sect_opts = NULL;
2235 size_t num_sect_opts = 0;
2236 struct cleanup *my_cleanups = make_cleanup (null_cleanup, NULL);
2239 sect_opts = XNEWVEC (struct sect_opt, num_sect_opts);
2244 error (_("add-symbol-file takes a file name and an address"));
2246 argv = gdb_buildargv (args);
2247 make_cleanup_freeargv (argv);
2249 for (arg = argv[0], argcnt = 0; arg != NULL; arg = argv[++argcnt])
2251 /* Process the argument. */
2254 /* The first argument is the file name. */
2255 filename = tilde_expand (arg);
2256 make_cleanup (xfree, filename);
2258 else if (argcnt == 1)
2260 /* The second argument is always the text address at which
2261 to load the program. */
2262 sect_opts[section_index].name = ".text";
2263 sect_opts[section_index].value = arg;
2264 if (++section_index >= num_sect_opts)
2267 sect_opts = ((struct sect_opt *)
2268 xrealloc (sect_opts,
2270 * sizeof (struct sect_opt)));
2275 /* It's an option (starting with '-') or it's an argument
2277 if (expecting_sec_name)
2279 sect_opts[section_index].name = arg;
2280 expecting_sec_name = 0;
2282 else if (expecting_sec_addr)
2284 sect_opts[section_index].value = arg;
2285 expecting_sec_addr = 0;
2286 if (++section_index >= num_sect_opts)
2289 sect_opts = ((struct sect_opt *)
2290 xrealloc (sect_opts,
2292 * sizeof (struct sect_opt)));
2295 else if (strcmp (arg, "-readnow") == 0)
2296 flags |= OBJF_READNOW;
2297 else if (strcmp (arg, "-s") == 0)
2299 expecting_sec_name = 1;
2300 expecting_sec_addr = 1;
2303 error (_("USAGE: add-symbol-file <filename> <textaddress>"
2304 " [-readnow] [-s <secname> <addr>]*"));
2308 /* This command takes at least two arguments. The first one is a
2309 filename, and the second is the address where this file has been
2310 loaded. Abort now if this address hasn't been provided by the
2312 if (section_index < 1)
2313 error (_("The address where %s has been loaded is missing"), filename);
2315 /* Print the prompt for the query below. And save the arguments into
2316 a sect_addr_info structure to be passed around to other
2317 functions. We have to split this up into separate print
2318 statements because hex_string returns a local static
2321 printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename);
2322 section_addrs = alloc_section_addr_info (section_index);
2323 make_cleanup (xfree, section_addrs);
2324 for (i = 0; i < section_index; i++)
2327 const char *val = sect_opts[i].value;
2328 const char *sec = sect_opts[i].name;
2330 addr = parse_and_eval_address (val);
2332 /* Here we store the section offsets in the order they were
2333 entered on the command line. */
2334 section_addrs->other[sec_num].name = (char *) sec;
2335 section_addrs->other[sec_num].addr = addr;
2336 printf_unfiltered ("\t%s_addr = %s\n", sec,
2337 paddress (gdbarch, addr));
2340 /* The object's sections are initialized when a
2341 call is made to build_objfile_section_table (objfile).
2342 This happens in reread_symbols.
2343 At this point, we don't know what file type this is,
2344 so we can't determine what section names are valid. */
2346 section_addrs->num_sections = sec_num;
2348 if (from_tty && (!query ("%s", "")))
2349 error (_("Not confirmed."));
2351 objf = symbol_file_add (filename, add_flags, section_addrs, flags);
2353 add_target_sections_of_objfile (objf);
2355 /* Getting new symbols may change our opinion about what is
2357 reinit_frame_cache ();
2358 do_cleanups (my_cleanups);
2362 /* This function removes a symbol file that was added via add-symbol-file. */
2365 remove_symbol_file_command (char *args, int from_tty)
2368 struct objfile *objf = NULL;
2369 struct cleanup *my_cleanups;
2370 struct program_space *pspace = current_program_space;
2375 error (_("remove-symbol-file: no symbol file provided"));
2377 my_cleanups = make_cleanup (null_cleanup, NULL);
2379 argv = gdb_buildargv (args);
2381 if (strcmp (argv[0], "-a") == 0)
2383 /* Interpret the next argument as an address. */
2386 if (argv[1] == NULL)
2387 error (_("Missing address argument"));
2389 if (argv[2] != NULL)
2390 error (_("Junk after %s"), argv[1]);
2392 addr = parse_and_eval_address (argv[1]);
2396 if ((objf->flags & OBJF_USERLOADED) != 0
2397 && (objf->flags & OBJF_SHARED) != 0
2398 && objf->pspace == pspace && is_addr_in_objfile (addr, objf))
2402 else if (argv[0] != NULL)
2404 /* Interpret the current argument as a file name. */
2407 if (argv[1] != NULL)
2408 error (_("Junk after %s"), argv[0]);
2410 filename = tilde_expand (argv[0]);
2411 make_cleanup (xfree, filename);
2415 if ((objf->flags & OBJF_USERLOADED) != 0
2416 && (objf->flags & OBJF_SHARED) != 0
2417 && objf->pspace == pspace
2418 && filename_cmp (filename, objfile_name (objf)) == 0)
2424 error (_("No symbol file found"));
2427 && !query (_("Remove symbol table from file \"%s\"? "),
2428 objfile_name (objf)))
2429 error (_("Not confirmed."));
2431 free_objfile (objf);
2432 clear_symtab_users (0);
2434 do_cleanups (my_cleanups);
2437 /* Re-read symbols if a symbol-file has changed. */
2440 reread_symbols (void)
2442 struct objfile *objfile;
2444 struct stat new_statbuf;
2446 std::vector<struct objfile *> new_objfiles;
2448 /* With the addition of shared libraries, this should be modified,
2449 the load time should be saved in the partial symbol tables, since
2450 different tables may come from different source files. FIXME.
2451 This routine should then walk down each partial symbol table
2452 and see if the symbol table that it originates from has been changed. */
2454 for (objfile = object_files; objfile; objfile = objfile->next)
2456 if (objfile->obfd == NULL)
2459 /* Separate debug objfiles are handled in the main objfile. */
2460 if (objfile->separate_debug_objfile_backlink)
2463 /* If this object is from an archive (what you usually create with
2464 `ar', often called a `static library' on most systems, though
2465 a `shared library' on AIX is also an archive), then you should
2466 stat on the archive name, not member name. */
2467 if (objfile->obfd->my_archive)
2468 res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
2470 res = stat (objfile_name (objfile), &new_statbuf);
2473 /* FIXME, should use print_sys_errmsg but it's not filtered. */
2474 printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"),
2475 objfile_name (objfile));
2478 new_modtime = new_statbuf.st_mtime;
2479 if (new_modtime != objfile->mtime)
2481 struct cleanup *old_cleanups;
2482 struct section_offsets *offsets;
2484 char *original_name;
2486 printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"),
2487 objfile_name (objfile));
2489 /* There are various functions like symbol_file_add,
2490 symfile_bfd_open, syms_from_objfile, etc., which might
2491 appear to do what we want. But they have various other
2492 effects which we *don't* want. So we just do stuff
2493 ourselves. We don't worry about mapped files (for one thing,
2494 any mapped file will be out of date). */
2496 /* If we get an error, blow away this objfile (not sure if
2497 that is the correct response for things like shared
2499 old_cleanups = make_cleanup_free_objfile (objfile);
2500 /* We need to do this whenever any symbols go away. */
2501 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);
2503 if (exec_bfd != NULL
2504 && filename_cmp (bfd_get_filename (objfile->obfd),
2505 bfd_get_filename (exec_bfd)) == 0)
2507 /* Reload EXEC_BFD without asking anything. */
2509 exec_file_attach (bfd_get_filename (objfile->obfd), 0);
2512 /* Keep the calls order approx. the same as in free_objfile. */
2514 /* Free the separate debug objfiles. It will be
2515 automatically recreated by sym_read. */
2516 free_objfile_separate_debug (objfile);
2518 /* Remove any references to this objfile in the global
2520 preserve_values (objfile);
2522 /* Nuke all the state that we will re-read. Much of the following
2523 code which sets things to NULL really is necessary to tell
2524 other parts of GDB that there is nothing currently there.
2526 Try to keep the freeing order compatible with free_objfile. */
2528 if (objfile->sf != NULL)
2530 (*objfile->sf->sym_finish) (objfile);
2533 clear_objfile_data (objfile);
2535 /* Clean up any state BFD has sitting around. */
2537 gdb_bfd_ref_ptr obfd (objfile->obfd);
2538 char *obfd_filename;
2540 obfd_filename = bfd_get_filename (objfile->obfd);
2541 /* Open the new BFD before freeing the old one, so that
2542 the filename remains live. */
2543 gdb_bfd_ref_ptr temp (gdb_bfd_open (obfd_filename, gnutarget, -1));
2544 objfile->obfd = temp.release ();
2545 if (objfile->obfd == NULL)
2546 error (_("Can't open %s to read symbols."), obfd_filename);
2549 original_name = xstrdup (objfile->original_name);
2550 make_cleanup (xfree, original_name);
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 (objfile),
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 obstack_free (&objfile->objfile_obstack, 0);
2580 objfile->sections = NULL;
2581 objfile->compunit_symtabs = NULL;
2582 objfile->psymtabs = NULL;
2583 objfile->psymtabs_addrmap = NULL;
2584 objfile->free_psymtabs = NULL;
2585 objfile->template_symbols = NULL;
2587 /* obstack_init also initializes the obstack so it is
2588 empty. We could use obstack_specify_allocation but
2589 gdb_obstack.h specifies the alloc/dealloc functions. */
2590 obstack_init (&objfile->objfile_obstack);
2592 /* set_objfile_per_bfd potentially allocates the per-bfd
2593 data on the objfile's obstack (if sharing data across
2594 multiple users is not possible), so it's important to
2595 do it *after* the obstack has been initialized. */
2596 set_objfile_per_bfd (objfile);
2598 objfile->original_name
2599 = (char *) obstack_copy0 (&objfile->objfile_obstack, original_name,
2600 strlen (original_name));
2602 /* Reset the sym_fns pointer. The ELF reader can change it
2603 based on whether .gdb_index is present, and we need it to
2604 start over. PR symtab/15885 */
2605 objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd));
2607 build_objfile_section_table (objfile);
2608 terminate_minimal_symbol_table (objfile);
2610 /* We use the same section offsets as from last time. I'm not
2611 sure whether that is always correct for shared libraries. */
2612 objfile->section_offsets = (struct section_offsets *)
2613 obstack_alloc (&objfile->objfile_obstack,
2614 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2615 memcpy (objfile->section_offsets, offsets,
2616 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2617 objfile->num_sections = num_offsets;
2619 /* What the hell is sym_new_init for, anyway? The concept of
2620 distinguishing between the main file and additional files
2621 in this way seems rather dubious. */
2622 if (objfile == symfile_objfile)
2624 (*objfile->sf->sym_new_init) (objfile);
2627 (*objfile->sf->sym_init) (objfile);
2628 clear_complaints (&symfile_complaints, 1, 1);
2630 objfile->flags &= ~OBJF_PSYMTABS_READ;
2631 read_symbols (objfile, 0);
2633 if (!objfile_has_symbols (objfile))
2636 printf_unfiltered (_("(no debugging symbols found)\n"));
2640 /* We're done reading the symbol file; finish off complaints. */
2641 clear_complaints (&symfile_complaints, 0, 1);
2643 /* Getting new symbols may change our opinion about what is
2646 reinit_frame_cache ();
2648 /* Discard cleanups as symbol reading was successful. */
2649 discard_cleanups (old_cleanups);
2651 /* If the mtime has changed between the time we set new_modtime
2652 and now, we *want* this to be out of date, so don't call stat
2654 objfile->mtime = new_modtime;
2655 init_entry_point_info (objfile);
2657 new_objfiles.push_back (objfile);
2661 if (!new_objfiles.empty ())
2663 /* Notify objfiles that we've modified objfile sections. */
2664 objfiles_changed ();
2666 clear_symtab_users (0);
2668 /* clear_objfile_data for each objfile was called before freeing it and
2669 observer_notify_new_objfile (NULL) has been called by
2670 clear_symtab_users above. Notify the new files now. */
2671 for (auto iter : new_objfiles)
2672 observer_notify_new_objfile (iter);
2674 /* At least one objfile has changed, so we can consider that
2675 the executable we're debugging has changed too. */
2676 observer_notify_executable_changed ();
2685 } filename_language;
2687 DEF_VEC_O (filename_language);
2689 static VEC (filename_language) *filename_language_table;
2691 /* See symfile.h. */
2694 add_filename_language (const char *ext, enum language lang)
2696 filename_language entry;
2698 entry.ext = xstrdup (ext);
2701 VEC_safe_push (filename_language, filename_language_table, &entry);
2704 static char *ext_args;
2706 show_ext_args (struct ui_file *file, int from_tty,
2707 struct cmd_list_element *c, const char *value)
2709 fprintf_filtered (file,
2710 _("Mapping between filename extension "
2711 "and source language is \"%s\".\n"),
2716 set_ext_lang_command (char *args, int from_tty, struct cmd_list_element *e)
2719 char *cp = ext_args;
2721 filename_language *entry;
2723 /* First arg is filename extension, starting with '.' */
2725 error (_("'%s': Filename extension must begin with '.'"), ext_args);
2727 /* Find end of first arg. */
2728 while (*cp && !isspace (*cp))
2732 error (_("'%s': two arguments required -- "
2733 "filename extension and language"),
2736 /* Null-terminate first arg. */
2739 /* Find beginning of second arg, which should be a source language. */
2740 cp = skip_spaces (cp);
2743 error (_("'%s': two arguments required -- "
2744 "filename extension and language"),
2747 /* Lookup the language from among those we know. */
2748 lang = language_enum (cp);
2750 /* Now lookup the filename extension: do we already know it? */
2752 VEC_iterate (filename_language, filename_language_table, i, entry);
2755 if (0 == strcmp (ext_args, entry->ext))
2761 /* New file extension. */
2762 add_filename_language (ext_args, lang);
2766 /* Redefining a previously known filename extension. */
2769 /* query ("Really make files of type %s '%s'?", */
2770 /* ext_args, language_str (lang)); */
2773 entry->ext = xstrdup (ext_args);
2779 info_ext_lang_command (char *args, int from_tty)
2782 filename_language *entry;
2784 printf_filtered (_("Filename extensions and the languages they represent:"));
2785 printf_filtered ("\n\n");
2787 VEC_iterate (filename_language, filename_language_table, i, entry);
2789 printf_filtered ("\t%s\t- %s\n", entry->ext, language_str (entry->lang));
2793 deduce_language_from_filename (const char *filename)
2798 if (filename != NULL)
2799 if ((cp = strrchr (filename, '.')) != NULL)
2801 filename_language *entry;
2804 VEC_iterate (filename_language, filename_language_table, i, entry);
2806 if (strcmp (cp, entry->ext) == 0)
2810 return language_unknown;
2813 /* Allocate and initialize a new symbol table.
2814 CUST is from the result of allocate_compunit_symtab. */
2817 allocate_symtab (struct compunit_symtab *cust, const char *filename)
2819 struct objfile *objfile = cust->objfile;
2820 struct symtab *symtab
2821 = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symtab);
2824 = (const char *) bcache (filename, strlen (filename) + 1,
2825 objfile->per_bfd->filename_cache);
2826 symtab->fullname = NULL;
2827 symtab->language = deduce_language_from_filename (filename);
2829 /* This can be very verbose with lots of headers.
2830 Only print at higher debug levels. */
2831 if (symtab_create_debug >= 2)
2833 /* Be a bit clever with debugging messages, and don't print objfile
2834 every time, only when it changes. */
2835 static char *last_objfile_name = NULL;
2837 if (last_objfile_name == NULL
2838 || strcmp (last_objfile_name, objfile_name (objfile)) != 0)
2840 xfree (last_objfile_name);
2841 last_objfile_name = xstrdup (objfile_name (objfile));
2842 fprintf_unfiltered (gdb_stdlog,
2843 "Creating one or more symtabs for objfile %s ...\n",
2846 fprintf_unfiltered (gdb_stdlog,
2847 "Created symtab %s for module %s.\n",
2848 host_address_to_string (symtab), filename);
2851 /* Add it to CUST's list of symtabs. */
2852 if (cust->filetabs == NULL)
2854 cust->filetabs = symtab;
2855 cust->last_filetab = symtab;
2859 cust->last_filetab->next = symtab;
2860 cust->last_filetab = symtab;
2863 /* Backlink to the containing compunit symtab. */
2864 symtab->compunit_symtab = cust;
2869 /* Allocate and initialize a new compunit.
2870 NAME is the name of the main source file, if there is one, or some
2871 descriptive text if there are no source files. */
2873 struct compunit_symtab *
2874 allocate_compunit_symtab (struct objfile *objfile, const char *name)
2876 struct compunit_symtab *cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2877 struct compunit_symtab);
2878 const char *saved_name;
2880 cu->objfile = objfile;
2882 /* The name we record here is only for display/debugging purposes.
2883 Just save the basename to avoid path issues (too long for display,
2884 relative vs absolute, etc.). */
2885 saved_name = lbasename (name);
2887 = (const char *) obstack_copy0 (&objfile->objfile_obstack, saved_name,
2888 strlen (saved_name));
2890 COMPUNIT_DEBUGFORMAT (cu) = "unknown";
2892 if (symtab_create_debug)
2894 fprintf_unfiltered (gdb_stdlog,
2895 "Created compunit symtab %s for %s.\n",
2896 host_address_to_string (cu),
2903 /* Hook CU to the objfile it comes from. */
2906 add_compunit_symtab_to_objfile (struct compunit_symtab *cu)
2908 cu->next = cu->objfile->compunit_symtabs;
2909 cu->objfile->compunit_symtabs = cu;
2913 /* Reset all data structures in gdb which may contain references to
2914 symbol table data. */
2917 clear_symtab_users (symfile_add_flags add_flags)
2919 /* Someday, we should do better than this, by only blowing away
2920 the things that really need to be blown. */
2922 /* Clear the "current" symtab first, because it is no longer valid.
2923 breakpoint_re_set may try to access the current symtab. */
2924 clear_current_source_symtab_and_line ();
2927 clear_last_displayed_sal ();
2928 clear_pc_function_cache ();
2929 observer_notify_new_objfile (NULL);
2931 /* Clear globals which might have pointed into a removed objfile.
2932 FIXME: It's not clear which of these are supposed to persist
2933 between expressions and which ought to be reset each time. */
2934 expression_context_block = NULL;
2935 innermost_block = NULL;
2937 /* Varobj may refer to old symbols, perform a cleanup. */
2938 varobj_invalidate ();
2940 /* Now that the various caches have been cleared, we can re_set
2941 our breakpoints without risking it using stale data. */
2942 if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0)
2943 breakpoint_re_set ();
2947 clear_symtab_users_cleanup (void *ignore)
2949 clear_symtab_users (0);
2953 The following code implements an abstraction for debugging overlay sections.
2955 The target model is as follows:
2956 1) The gnu linker will permit multiple sections to be mapped into the
2957 same VMA, each with its own unique LMA (or load address).
2958 2) It is assumed that some runtime mechanism exists for mapping the
2959 sections, one by one, from the load address into the VMA address.
2960 3) This code provides a mechanism for gdb to keep track of which
2961 sections should be considered to be mapped from the VMA to the LMA.
2962 This information is used for symbol lookup, and memory read/write.
2963 For instance, if a section has been mapped then its contents
2964 should be read from the VMA, otherwise from the LMA.
2966 Two levels of debugger support for overlays are available. One is
2967 "manual", in which the debugger relies on the user to tell it which
2968 overlays are currently mapped. This level of support is
2969 implemented entirely in the core debugger, and the information about
2970 whether a section is mapped is kept in the objfile->obj_section table.
2972 The second level of support is "automatic", and is only available if
2973 the target-specific code provides functionality to read the target's
2974 overlay mapping table, and translate its contents for the debugger
2975 (by updating the mapped state information in the obj_section tables).
2977 The interface is as follows:
2979 overlay map <name> -- tell gdb to consider this section mapped
2980 overlay unmap <name> -- tell gdb to consider this section unmapped
2981 overlay list -- list the sections that GDB thinks are mapped
2982 overlay read-target -- get the target's state of what's mapped
2983 overlay off/manual/auto -- set overlay debugging state
2984 Functional interface:
2985 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2986 section, return that section.
2987 find_pc_overlay(pc): find any overlay section that contains
2988 the pc, either in its VMA or its LMA
2989 section_is_mapped(sect): true if overlay is marked as mapped
2990 section_is_overlay(sect): true if section's VMA != LMA
2991 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2992 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2993 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap
2994 overlay_mapped_address(...): map an address from section's LMA to VMA
2995 overlay_unmapped_address(...): map an address from section's VMA to LMA
2996 symbol_overlayed_address(...): Return a "current" address for symbol:
2997 either in VMA or LMA depending on whether
2998 the symbol's section is currently mapped. */
3000 /* Overlay debugging state: */
3002 enum overlay_debugging_state overlay_debugging = ovly_off;
3003 int overlay_cache_invalid = 0; /* True if need to refresh mapped state. */
3005 /* Function: section_is_overlay (SECTION)
3006 Returns true if SECTION has VMA not equal to LMA, ie.
3007 SECTION is loaded at an address different from where it will "run". */
3010 section_is_overlay (struct obj_section *section)
3012 if (overlay_debugging && section)
3014 bfd *abfd = section->objfile->obfd;
3015 asection *bfd_section = section->the_bfd_section;
3017 if (bfd_section_lma (abfd, bfd_section) != 0
3018 && bfd_section_lma (abfd, bfd_section)
3019 != bfd_section_vma (abfd, bfd_section))
3026 /* Function: overlay_invalidate_all (void)
3027 Invalidate the mapped state of all overlay sections (mark it as stale). */
3030 overlay_invalidate_all (void)
3032 struct objfile *objfile;
3033 struct obj_section *sect;
3035 ALL_OBJSECTIONS (objfile, sect)
3036 if (section_is_overlay (sect))
3037 sect->ovly_mapped = -1;
3040 /* Function: section_is_mapped (SECTION)
3041 Returns true if section is an overlay, and is currently mapped.
3043 Access to the ovly_mapped flag is restricted to this function, so
3044 that we can do automatic update. If the global flag
3045 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
3046 overlay_invalidate_all. If the mapped state of the particular
3047 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
3050 section_is_mapped (struct obj_section *osect)
3052 struct gdbarch *gdbarch;
3054 if (osect == 0 || !section_is_overlay (osect))
3057 switch (overlay_debugging)
3061 return 0; /* overlay debugging off */
3062 case ovly_auto: /* overlay debugging automatic */
3063 /* Unles there is a gdbarch_overlay_update function,
3064 there's really nothing useful to do here (can't really go auto). */
3065 gdbarch = get_objfile_arch (osect->objfile);
3066 if (gdbarch_overlay_update_p (gdbarch))
3068 if (overlay_cache_invalid)
3070 overlay_invalidate_all ();
3071 overlay_cache_invalid = 0;
3073 if (osect->ovly_mapped == -1)
3074 gdbarch_overlay_update (gdbarch, osect);
3076 /* fall thru to manual case */
3077 case ovly_on: /* overlay debugging manual */
3078 return osect->ovly_mapped == 1;
3082 /* Function: pc_in_unmapped_range
3083 If PC falls into the lma range of SECTION, return true, else false. */
3086 pc_in_unmapped_range (CORE_ADDR pc, struct obj_section *section)
3088 if (section_is_overlay (section))
3090 bfd *abfd = section->objfile->obfd;
3091 asection *bfd_section = section->the_bfd_section;
3093 /* We assume the LMA is relocated by the same offset as the VMA. */
3094 bfd_vma size = bfd_get_section_size (bfd_section);
3095 CORE_ADDR offset = obj_section_offset (section);
3097 if (bfd_get_section_lma (abfd, bfd_section) + offset <= pc
3098 && pc < bfd_get_section_lma (abfd, bfd_section) + offset + size)
3105 /* Function: pc_in_mapped_range
3106 If PC falls into the vma range of SECTION, return true, else false. */
3109 pc_in_mapped_range (CORE_ADDR pc, struct obj_section *section)
3111 if (section_is_overlay (section))
3113 if (obj_section_addr (section) <= pc
3114 && pc < obj_section_endaddr (section))
3121 /* Return true if the mapped ranges of sections A and B overlap, false
3125 sections_overlap (struct obj_section *a, struct obj_section *b)
3127 CORE_ADDR a_start = obj_section_addr (a);
3128 CORE_ADDR a_end = obj_section_endaddr (a);
3129 CORE_ADDR b_start = obj_section_addr (b);
3130 CORE_ADDR b_end = obj_section_endaddr (b);
3132 return (a_start < b_end && b_start < a_end);
3135 /* Function: overlay_unmapped_address (PC, SECTION)
3136 Returns the address corresponding to PC in the unmapped (load) range.
3137 May be the same as PC. */
3140 overlay_unmapped_address (CORE_ADDR pc, struct obj_section *section)
3142 if (section_is_overlay (section) && pc_in_mapped_range (pc, section))
3144 bfd *abfd = section->objfile->obfd;
3145 asection *bfd_section = section->the_bfd_section;
3147 return pc + bfd_section_lma (abfd, bfd_section)
3148 - bfd_section_vma (abfd, bfd_section);
3154 /* Function: overlay_mapped_address (PC, SECTION)
3155 Returns the address corresponding to PC in the mapped (runtime) range.
3156 May be the same as PC. */
3159 overlay_mapped_address (CORE_ADDR pc, struct obj_section *section)
3161 if (section_is_overlay (section) && pc_in_unmapped_range (pc, section))
3163 bfd *abfd = section->objfile->obfd;
3164 asection *bfd_section = section->the_bfd_section;
3166 return pc + bfd_section_vma (abfd, bfd_section)
3167 - 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)
3215 ALL_OBJSECTIONS (objfile, osect)
3216 if (section_is_overlay (osect))
3218 if (pc_in_mapped_range (pc, osect))
3220 if (section_is_mapped (osect))
3225 else if (pc_in_unmapped_range (pc, osect))
3232 /* Function: find_pc_mapped_section (PC)
3233 If PC falls into the VMA address range of an overlay section that is
3234 currently marked as MAPPED, return that section. Else return NULL. */
3236 struct obj_section *
3237 find_pc_mapped_section (CORE_ADDR pc)
3239 struct objfile *objfile;
3240 struct obj_section *osect;
3242 if (overlay_debugging)
3244 ALL_OBJSECTIONS (objfile, osect)
3245 if (pc_in_mapped_range (pc, osect) && section_is_mapped (osect))
3252 /* Function: list_overlays_command
3253 Print a list of mapped sections and their PC ranges. */
3256 list_overlays_command (char *args, int from_tty)
3259 struct objfile *objfile;
3260 struct obj_section *osect;
3262 if (overlay_debugging)
3264 ALL_OBJSECTIONS (objfile, osect)
3265 if (section_is_mapped (osect))
3267 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3272 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section);
3273 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section);
3274 size = bfd_get_section_size (osect->the_bfd_section);
3275 name = bfd_section_name (objfile->obfd, osect->the_bfd_section);
3277 printf_filtered ("Section %s, loaded at ", name);
3278 fputs_filtered (paddress (gdbarch, lma), gdb_stdout);
3279 puts_filtered (" - ");
3280 fputs_filtered (paddress (gdbarch, lma + size), gdb_stdout);
3281 printf_filtered (", mapped at ");
3282 fputs_filtered (paddress (gdbarch, vma), gdb_stdout);
3283 puts_filtered (" - ");
3284 fputs_filtered (paddress (gdbarch, vma + size), gdb_stdout);
3285 puts_filtered ("\n");
3291 printf_filtered (_("No sections are mapped.\n"));
3294 /* Function: map_overlay_command
3295 Mark the named section as mapped (ie. residing at its VMA address). */
3298 map_overlay_command (char *args, int from_tty)
3300 struct objfile *objfile, *objfile2;
3301 struct obj_section *sec, *sec2;
3303 if (!overlay_debugging)
3304 error (_("Overlay debugging not enabled. Use "
3305 "either the 'overlay auto' or\n"
3306 "the 'overlay manual' command."));
3308 if (args == 0 || *args == 0)
3309 error (_("Argument required: name of an overlay section"));
3311 /* First, find a section matching the user supplied argument. */
3312 ALL_OBJSECTIONS (objfile, sec)
3313 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
3315 /* Now, check to see if the section is an overlay. */
3316 if (!section_is_overlay (sec))
3317 continue; /* not an overlay section */
3319 /* Mark the overlay as "mapped". */
3320 sec->ovly_mapped = 1;
3322 /* Next, make a pass and unmap any sections that are
3323 overlapped by this new section: */
3324 ALL_OBJSECTIONS (objfile2, sec2)
3325 if (sec2->ovly_mapped && sec != sec2 && sections_overlap (sec, sec2))
3328 printf_unfiltered (_("Note: section %s unmapped by overlap\n"),
3329 bfd_section_name (objfile->obfd,
3330 sec2->the_bfd_section));
3331 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2. */
3335 error (_("No overlay section called %s"), args);
3338 /* Function: unmap_overlay_command
3339 Mark the overlay section as unmapped
3340 (ie. resident in its LMA address range, rather than the VMA range). */
3343 unmap_overlay_command (char *args, int from_tty)
3345 struct objfile *objfile;
3346 struct obj_section *sec = NULL;
3348 if (!overlay_debugging)
3349 error (_("Overlay debugging not enabled. "
3350 "Use either the 'overlay auto' or\n"
3351 "the 'overlay manual' command."));
3353 if (args == 0 || *args == 0)
3354 error (_("Argument required: name of an overlay section"));
3356 /* First, find a section matching the user supplied argument. */
3357 ALL_OBJSECTIONS (objfile, sec)
3358 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
3360 if (!sec->ovly_mapped)
3361 error (_("Section %s is not mapped"), args);
3362 sec->ovly_mapped = 0;
3365 error (_("No overlay section called %s"), args);
3368 /* Function: overlay_auto_command
3369 A utility command to turn on overlay debugging.
3370 Possibly this should be done via a set/show command. */
3373 overlay_auto_command (char *args, int from_tty)
3375 overlay_debugging = ovly_auto;
3376 enable_overlay_breakpoints ();
3378 printf_unfiltered (_("Automatic overlay debugging enabled."));
3381 /* Function: overlay_manual_command
3382 A utility command to turn on overlay debugging.
3383 Possibly this should be done via a set/show command. */
3386 overlay_manual_command (char *args, int from_tty)
3388 overlay_debugging = ovly_on;
3389 disable_overlay_breakpoints ();
3391 printf_unfiltered (_("Overlay debugging enabled."));
3394 /* Function: overlay_off_command
3395 A utility command to turn on overlay debugging.
3396 Possibly this should be done via a set/show command. */
3399 overlay_off_command (char *args, int from_tty)
3401 overlay_debugging = ovly_off;
3402 disable_overlay_breakpoints ();
3404 printf_unfiltered (_("Overlay debugging disabled."));
3408 overlay_load_command (char *args, int from_tty)
3410 struct gdbarch *gdbarch = get_current_arch ();
3412 if (gdbarch_overlay_update_p (gdbarch))
3413 gdbarch_overlay_update (gdbarch, NULL);
3415 error (_("This target does not know how to read its overlay state."));
3418 /* Function: overlay_command
3419 A place-holder for a mis-typed command. */
3421 /* Command list chain containing all defined "overlay" subcommands. */
3422 static struct cmd_list_element *overlaylist;
3425 overlay_command (char *args, int from_tty)
3428 ("\"overlay\" must be followed by the name of an overlay command.\n");
3429 help_list (overlaylist, "overlay ", all_commands, gdb_stdout);
3432 /* Target Overlays for the "Simplest" overlay manager:
3434 This is GDB's default target overlay layer. It works with the
3435 minimal overlay manager supplied as an example by Cygnus. The
3436 entry point is via a function pointer "gdbarch_overlay_update",
3437 so targets that use a different runtime overlay manager can
3438 substitute their own overlay_update function and take over the
3441 The overlay_update function pokes around in the target's data structures
3442 to see what overlays are mapped, and updates GDB's overlay mapping with
3445 In this simple implementation, the target data structures are as follows:
3446 unsigned _novlys; /# number of overlay sections #/
3447 unsigned _ovly_table[_novlys][4] = {
3448 {VMA, OSIZE, LMA, MAPPED}, /# one entry per overlay section #/
3449 {..., ..., ..., ...},
3451 unsigned _novly_regions; /# number of overlay regions #/
3452 unsigned _ovly_region_table[_novly_regions][3] = {
3453 {VMA, OSIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
3456 These functions will attempt to update GDB's mappedness state in the
3457 symbol section table, based on the target's mappedness state.
3459 To do this, we keep a cached copy of the target's _ovly_table, and
3460 attempt to detect when the cached copy is invalidated. The main
3461 entry point is "simple_overlay_update(SECT), which looks up SECT in
3462 the cached table and re-reads only the entry for that section from
3463 the target (whenever possible). */
3465 /* Cached, dynamically allocated copies of the target data structures: */
3466 static unsigned (*cache_ovly_table)[4] = 0;
3467 static unsigned cache_novlys = 0;
3468 static CORE_ADDR cache_ovly_table_base = 0;
3471 VMA, OSIZE, LMA, MAPPED
3474 /* Throw away the cached copy of _ovly_table. */
3477 simple_free_overlay_table (void)
3479 if (cache_ovly_table)
3480 xfree (cache_ovly_table);
3482 cache_ovly_table = NULL;
3483 cache_ovly_table_base = 0;
3486 /* Read an array of ints of size SIZE from the target into a local buffer.
3487 Convert to host order. int LEN is number of ints. */
3490 read_target_long_array (CORE_ADDR memaddr, unsigned int *myaddr,
3491 int len, int size, enum bfd_endian byte_order)
3493 /* FIXME (alloca): Not safe if array is very large. */
3494 gdb_byte *buf = (gdb_byte *) alloca (len * size);
3497 read_memory (memaddr, buf, len * size);
3498 for (i = 0; i < len; i++)
3499 myaddr[i] = extract_unsigned_integer (size * i + buf, size, byte_order);
3502 /* Find and grab a copy of the target _ovly_table
3503 (and _novlys, which is needed for the table's size). */
3506 simple_read_overlay_table (void)
3508 struct bound_minimal_symbol novlys_msym;
3509 struct bound_minimal_symbol ovly_table_msym;
3510 struct gdbarch *gdbarch;
3512 enum bfd_endian byte_order;
3514 simple_free_overlay_table ();
3515 novlys_msym = lookup_minimal_symbol ("_novlys", NULL, NULL);
3516 if (! novlys_msym.minsym)
3518 error (_("Error reading inferior's overlay table: "
3519 "couldn't find `_novlys' variable\n"
3520 "in inferior. Use `overlay manual' mode."));
3524 ovly_table_msym = lookup_bound_minimal_symbol ("_ovly_table");
3525 if (! ovly_table_msym.minsym)
3527 error (_("Error reading inferior's overlay table: couldn't find "
3528 "`_ovly_table' array\n"
3529 "in inferior. Use `overlay manual' mode."));
3533 gdbarch = get_objfile_arch (ovly_table_msym.objfile);
3534 word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
3535 byte_order = gdbarch_byte_order (gdbarch);
3537 cache_novlys = read_memory_integer (BMSYMBOL_VALUE_ADDRESS (novlys_msym),
3540 = (unsigned int (*)[4]) xmalloc (cache_novlys * sizeof (*cache_ovly_table));
3541 cache_ovly_table_base = BMSYMBOL_VALUE_ADDRESS (ovly_table_msym);
3542 read_target_long_array (cache_ovly_table_base,
3543 (unsigned int *) cache_ovly_table,
3544 cache_novlys * 4, word_size, byte_order);
3546 return 1; /* SUCCESS */
3549 /* Function: simple_overlay_update_1
3550 A helper function for simple_overlay_update. Assuming a cached copy
3551 of _ovly_table exists, look through it to find an entry whose vma,
3552 lma and size match those of OSECT. Re-read the entry and make sure
3553 it still matches OSECT (else the table may no longer be valid).
3554 Set OSECT's mapped state to match the entry. Return: 1 for
3555 success, 0 for failure. */
3558 simple_overlay_update_1 (struct obj_section *osect)
3561 bfd *obfd = osect->objfile->obfd;
3562 asection *bsect = osect->the_bfd_section;
3563 struct gdbarch *gdbarch = get_objfile_arch (osect->objfile);
3564 int word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
3565 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
3567 for (i = 0; i < cache_novlys; i++)
3568 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3569 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect))
3571 read_target_long_array (cache_ovly_table_base + i * word_size,
3572 (unsigned int *) cache_ovly_table[i],
3573 4, word_size, byte_order);
3574 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3575 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect))
3577 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3580 else /* Warning! Warning! Target's ovly table has changed! */
3586 /* Function: simple_overlay_update
3587 If OSECT is NULL, then update all sections' mapped state
3588 (after re-reading the entire target _ovly_table).
3589 If OSECT is non-NULL, then try to find a matching entry in the
3590 cached ovly_table and update only OSECT's mapped state.
3591 If a cached entry can't be found or the cache isn't valid, then
3592 re-read the entire cache, and go ahead and update all sections. */
3595 simple_overlay_update (struct obj_section *osect)
3597 struct objfile *objfile;
3599 /* Were we given an osect to look up? NULL means do all of them. */
3601 /* Have we got a cached copy of the target's overlay table? */
3602 if (cache_ovly_table != NULL)
3604 /* Does its cached location match what's currently in the
3606 struct bound_minimal_symbol minsym
3607 = lookup_minimal_symbol ("_ovly_table", NULL, NULL);
3609 if (minsym.minsym == NULL)
3610 error (_("Error reading inferior's overlay table: couldn't "
3611 "find `_ovly_table' array\n"
3612 "in inferior. Use `overlay manual' mode."));
3614 if (cache_ovly_table_base == BMSYMBOL_VALUE_ADDRESS (minsym))
3615 /* Then go ahead and try to look up this single section in
3617 if (simple_overlay_update_1 (osect))
3618 /* Found it! We're done. */
3622 /* Cached table no good: need to read the entire table anew.
3623 Or else we want all the sections, in which case it's actually
3624 more efficient to read the whole table in one block anyway. */
3626 if (! simple_read_overlay_table ())
3629 /* Now may as well update all sections, even if only one was requested. */
3630 ALL_OBJSECTIONS (objfile, osect)
3631 if (section_is_overlay (osect))
3634 bfd *obfd = osect->objfile->obfd;
3635 asection *bsect = osect->the_bfd_section;
3637 for (i = 0; i < cache_novlys; i++)
3638 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3639 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect))
3640 { /* obj_section matches i'th entry in ovly_table. */
3641 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3642 break; /* finished with inner for loop: break out. */
3647 /* Set the output sections and output offsets for section SECTP in
3648 ABFD. The relocation code in BFD will read these offsets, so we
3649 need to be sure they're initialized. We map each section to itself,
3650 with no offset; this means that SECTP->vma will be honored. */
3653 symfile_dummy_outputs (bfd *abfd, asection *sectp, void *dummy)
3655 sectp->output_section = sectp;
3656 sectp->output_offset = 0;
3659 /* Default implementation for sym_relocate. */
3662 default_symfile_relocate (struct objfile *objfile, asection *sectp,
3665 /* Use sectp->owner instead of objfile->obfd. sectp may point to a
3667 bfd *abfd = sectp->owner;
3669 /* We're only interested in sections with relocation
3671 if ((sectp->flags & SEC_RELOC) == 0)
3674 /* We will handle section offsets properly elsewhere, so relocate as if
3675 all sections begin at 0. */
3676 bfd_map_over_sections (abfd, symfile_dummy_outputs, NULL);
3678 return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL);
3681 /* Relocate the contents of a debug section SECTP in ABFD. The
3682 contents are stored in BUF if it is non-NULL, or returned in a
3683 malloc'd buffer otherwise.
3685 For some platforms and debug info formats, shared libraries contain
3686 relocations against the debug sections (particularly for DWARF-2;
3687 one affected platform is PowerPC GNU/Linux, although it depends on
3688 the version of the linker in use). Also, ELF object files naturally
3689 have unresolved relocations for their debug sections. We need to apply
3690 the relocations in order to get the locations of symbols correct.
3691 Another example that may require relocation processing, is the
3692 DWARF-2 .eh_frame section in .o files, although it isn't strictly a
3696 symfile_relocate_debug_section (struct objfile *objfile,
3697 asection *sectp, bfd_byte *buf)
3699 gdb_assert (objfile->sf->sym_relocate);
3701 return (*objfile->sf->sym_relocate) (objfile, sectp, buf);
3704 struct symfile_segment_data *
3705 get_symfile_segment_data (bfd *abfd)
3707 const struct sym_fns *sf = find_sym_fns (abfd);
3712 return sf->sym_segments (abfd);
3716 free_symfile_segment_data (struct symfile_segment_data *data)
3718 xfree (data->segment_bases);
3719 xfree (data->segment_sizes);
3720 xfree (data->segment_info);
3725 - DATA, containing segment addresses from the object file ABFD, and
3726 the mapping from ABFD's sections onto the segments that own them,
3728 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual
3729 segment addresses reported by the target,
3730 store the appropriate offsets for each section in OFFSETS.
3732 If there are fewer entries in SEGMENT_BASES than there are segments
3733 in DATA, then apply SEGMENT_BASES' last entry to all the segments.
3735 If there are more entries, then ignore the extra. The target may
3736 not be able to distinguish between an empty data segment and a
3737 missing data segment; a missing text segment is less plausible. */
3740 symfile_map_offsets_to_segments (bfd *abfd,
3741 const struct symfile_segment_data *data,
3742 struct section_offsets *offsets,
3743 int num_segment_bases,
3744 const CORE_ADDR *segment_bases)
3749 /* It doesn't make sense to call this function unless you have some
3750 segment base addresses. */
3751 gdb_assert (num_segment_bases > 0);
3753 /* If we do not have segment mappings for the object file, we
3754 can not relocate it by segments. */
3755 gdb_assert (data != NULL);
3756 gdb_assert (data->num_segments > 0);
3758 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
3760 int which = data->segment_info[i];
3762 gdb_assert (0 <= which && which <= data->num_segments);
3764 /* Don't bother computing offsets for sections that aren't
3765 loaded as part of any segment. */
3769 /* Use the last SEGMENT_BASES entry as the address of any extra
3770 segments mentioned in DATA->segment_info. */
3771 if (which > num_segment_bases)
3772 which = num_segment_bases;
3774 offsets->offsets[i] = (segment_bases[which - 1]
3775 - data->segment_bases[which - 1]);
3782 symfile_find_segment_sections (struct objfile *objfile)
3784 bfd *abfd = objfile->obfd;
3787 struct symfile_segment_data *data;
3789 data = get_symfile_segment_data (objfile->obfd);
3793 if (data->num_segments != 1 && data->num_segments != 2)
3795 free_symfile_segment_data (data);
3799 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
3801 int which = data->segment_info[i];
3805 if (objfile->sect_index_text == -1)
3806 objfile->sect_index_text = sect->index;
3808 if (objfile->sect_index_rodata == -1)
3809 objfile->sect_index_rodata = sect->index;
3811 else if (which == 2)
3813 if (objfile->sect_index_data == -1)
3814 objfile->sect_index_data = sect->index;
3816 if (objfile->sect_index_bss == -1)
3817 objfile->sect_index_bss = sect->index;
3821 free_symfile_segment_data (data);
3824 /* Listen for free_objfile events. */
3827 symfile_free_objfile (struct objfile *objfile)
3829 /* Remove the target sections owned by this objfile. */
3830 if (objfile != NULL)
3831 remove_target_sections ((void *) objfile);
3834 /* Wrapper around the quick_symbol_functions expand_symtabs_matching "method".
3835 Expand all symtabs that match the specified criteria.
3836 See quick_symbol_functions.expand_symtabs_matching for details. */
3839 expand_symtabs_matching
3840 (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
3841 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
3842 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
3843 enum search_domain kind)
3845 struct objfile *objfile;
3847 ALL_OBJFILES (objfile)
3850 objfile->sf->qf->expand_symtabs_matching (objfile, file_matcher,
3852 expansion_notify, kind);
3856 /* Wrapper around the quick_symbol_functions map_symbol_filenames "method".
3857 Map function FUN over every file.
3858 See quick_symbol_functions.map_symbol_filenames for details. */
3861 map_symbol_filenames (symbol_filename_ftype *fun, void *data,
3864 struct objfile *objfile;
3866 ALL_OBJFILES (objfile)
3869 objfile->sf->qf->map_symbol_filenames (objfile, fun, data,
3875 _initialize_symfile (void)
3877 struct cmd_list_element *c;
3879 observer_attach_free_objfile (symfile_free_objfile);
3881 c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\
3882 Load symbol table from executable file FILE.\n\
3883 The `file' command can also load symbol tables, as well as setting the file\n\
3884 to execute."), &cmdlist);
3885 set_cmd_completer (c, filename_completer);
3887 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command, _("\
3888 Load symbols from FILE, assuming FILE has been dynamically loaded.\n\
3889 Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR>\
3890 ...]\nADDR is the starting address of the file's text.\n\
3891 The optional arguments are section-name section-address pairs and\n\
3892 should be specified if the data and bss segments are not contiguous\n\
3893 with the text. SECT is a section name to be loaded at SECT_ADDR."),
3895 set_cmd_completer (c, filename_completer);
3897 c = add_cmd ("remove-symbol-file", class_files,
3898 remove_symbol_file_command, _("\
3899 Remove a symbol file added via the add-symbol-file command.\n\
3900 Usage: remove-symbol-file FILENAME\n\
3901 remove-symbol-file -a ADDRESS\n\
3902 The file to remove can be identified by its filename or by an address\n\
3903 that lies within the boundaries of this symbol file in memory."),
3906 c = add_cmd ("load", class_files, load_command, _("\
3907 Dynamically load FILE into the running program, and record its symbols\n\
3908 for access from GDB.\n\
3909 An optional load OFFSET may also be given as a literal address.\n\
3910 When OFFSET is provided, FILE must also be provided. FILE can be provided\n\
3912 Usage: load [FILE] [OFFSET]"), &cmdlist);
3913 set_cmd_completer (c, filename_completer);
3915 add_prefix_cmd ("overlay", class_support, overlay_command,
3916 _("Commands for debugging overlays."), &overlaylist,
3917 "overlay ", 0, &cmdlist);
3919 add_com_alias ("ovly", "overlay", class_alias, 1);
3920 add_com_alias ("ov", "overlay", class_alias, 1);
3922 add_cmd ("map-overlay", class_support, map_overlay_command,
3923 _("Assert that an overlay section is mapped."), &overlaylist);
3925 add_cmd ("unmap-overlay", class_support, unmap_overlay_command,
3926 _("Assert that an overlay section is unmapped."), &overlaylist);
3928 add_cmd ("list-overlays", class_support, list_overlays_command,
3929 _("List mappings of overlay sections."), &overlaylist);
3931 add_cmd ("manual", class_support, overlay_manual_command,
3932 _("Enable overlay debugging."), &overlaylist);
3933 add_cmd ("off", class_support, overlay_off_command,
3934 _("Disable overlay debugging."), &overlaylist);
3935 add_cmd ("auto", class_support, overlay_auto_command,
3936 _("Enable automatic overlay debugging."), &overlaylist);
3937 add_cmd ("load-target", class_support, overlay_load_command,
3938 _("Read the overlay mapping state from the target."), &overlaylist);
3940 /* Filename extension to source language lookup table: */
3941 add_setshow_string_noescape_cmd ("extension-language", class_files,
3943 Set mapping between filename extension and source language."), _("\
3944 Show mapping between filename extension and source language."), _("\
3945 Usage: set extension-language .foo bar"),
3946 set_ext_lang_command,
3948 &setlist, &showlist);
3950 add_info ("extensions", info_ext_lang_command,
3951 _("All filename extensions associated with a source language."));
3953 add_setshow_optional_filename_cmd ("debug-file-directory", class_support,
3954 &debug_file_directory, _("\
3955 Set the directories where separate debug symbols are searched for."), _("\
3956 Show the directories where separate debug symbols are searched for."), _("\
3957 Separate debug symbols are first searched for in the same\n\
3958 directory as the binary, then in the `" DEBUG_SUBDIRECTORY "' subdirectory,\n\
3959 and lastly at the path of the directory of the binary with\n\
3960 each global debug-file-directory component prepended."),
3962 show_debug_file_directory,
3963 &setlist, &showlist);
3965 add_setshow_enum_cmd ("symbol-loading", no_class,
3966 print_symbol_loading_enums, &print_symbol_loading,
3968 Set printing of symbol loading messages."), _("\
3969 Show printing of symbol loading messages."), _("\
3970 off == turn all messages off\n\
3971 brief == print messages for the executable,\n\
3972 and brief messages for shared libraries\n\
3973 full == print messages for the executable,\n\
3974 and messages for each shared library."),
3977 &setprintlist, &showprintlist);