1 /* Handle shared libraries for GDB, the GNU Debugger.
3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010
5 Free Software Foundation, Inc.
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/>. */
24 #include <sys/types.h>
26 #include "gdb_string.h"
31 #include "exceptions.h"
36 #include "gdb_regex.h"
41 #include "completer.h"
42 #include "filenames.h" /* for DOSish file names */
46 #include "readline/readline.h"
51 /* Architecture-specific operations. */
53 /* Per-architecture data key. */
54 static struct gdbarch_data *solib_data;
57 solib_init (struct obstack *obstack)
59 struct target_so_ops **ops;
61 ops = OBSTACK_ZALLOC (obstack, struct target_so_ops *);
62 *ops = current_target_so_ops;
66 static struct target_so_ops *
67 solib_ops (struct gdbarch *gdbarch)
69 struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
73 /* Set the solib operations for GDBARCH to NEW_OPS. */
76 set_solib_ops (struct gdbarch *gdbarch, struct target_so_ops *new_ops)
78 struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
83 /* external data declarations */
85 /* FIXME: gdbarch needs to control this variable, or else every
86 configuration needs to call set_solib_ops. */
87 struct target_so_ops *current_target_so_ops;
89 /* List of known shared objects */
90 #define so_list_head current_program_space->so_list
92 /* Local function prototypes */
94 /* If non-empty, this is a search path for loading non-absolute shared library
95 symbol files. This takes precedence over the environment variables PATH
96 and LD_LIBRARY_PATH. */
97 static char *solib_search_path = NULL;
99 show_solib_search_path (struct ui_file *file, int from_tty,
100 struct cmd_list_element *c, const char *value)
102 fprintf_filtered (file, _("\
103 The search path for loading non-absolute shared library symbol files is %s.\n"),
111 solib_find -- Find a shared library file.
115 char *solib_find (char *in_pathname, int *fd);
119 Global variable GDB_SYSROOT is used as a prefix directory
120 to search for shared libraries if they have an absolute path.
122 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
123 (or set of directories, as in LD_LIBRARY_PATH) to search for all
124 shared libraries if not found in GDB_SYSROOT.
127 * If there is a gdb_sysroot and path is absolute:
128 * Search for gdb_sysroot/path.
130 * Look for it literally (unmodified).
131 * Look in SOLIB_SEARCH_PATH.
132 * If available, use target defined search function.
133 * If gdb_sysroot is NOT set, perform the following two searches:
134 * Look in inferior's $PATH.
135 * Look in inferior's $LD_LIBRARY_PATH.
137 * The last check avoids doing this search when targetting remote
138 * machines since gdb_sysroot will almost always be set.
142 Full pathname of the shared library file, or NULL if not found.
143 (The pathname is malloc'ed; it needs to be freed by the caller.)
144 *FD is set to either -1 or an open file handle for the library. */
147 solib_find (char *in_pathname, int *fd)
149 struct target_so_ops *ops = solib_ops (target_gdbarch);
151 char *temp_pathname = NULL;
152 int gdb_sysroot_is_empty;
153 const char *solib_symbols_extension
154 = gdbarch_solib_symbols_extension (target_gdbarch);
156 /* If solib_symbols_extension is set, replace the file's
158 if (solib_symbols_extension)
160 char *p = in_pathname + strlen (in_pathname);
161 while (p > in_pathname && *p != '.')
168 new_pathname = alloca (p - in_pathname + 1
169 + strlen (solib_symbols_extension) + 1);
170 memcpy (new_pathname, in_pathname, p - in_pathname + 1);
171 strcpy (new_pathname + (p - in_pathname) + 1,
172 solib_symbols_extension);
174 in_pathname = new_pathname;
178 gdb_sysroot_is_empty = (gdb_sysroot == NULL || *gdb_sysroot == 0);
180 if (! IS_ABSOLUTE_PATH (in_pathname) || gdb_sysroot_is_empty)
181 temp_pathname = in_pathname;
184 int prefix_len = strlen (gdb_sysroot);
186 /* Remove trailing slashes from absolute prefix. */
187 while (prefix_len > 0
188 && IS_DIR_SEPARATOR (gdb_sysroot[prefix_len - 1]))
191 /* Cat the prefixed pathname together. */
192 temp_pathname = alloca (prefix_len + strlen (in_pathname) + 1);
193 strncpy (temp_pathname, gdb_sysroot, prefix_len);
194 temp_pathname[prefix_len] = '\0';
195 strcat (temp_pathname, in_pathname);
198 /* Handle remote files. */
199 if (remote_filename_p (temp_pathname))
202 return xstrdup (temp_pathname);
205 /* Now see if we can open it. */
206 found_file = open (temp_pathname, O_RDONLY | O_BINARY, 0);
208 /* We try to find the library in various ways. After each attempt
209 (except for the one above), either found_file >= 0 and
210 temp_pathname is a malloc'd string, or found_file < 0 and
211 temp_pathname does not point to storage that needs to be
215 temp_pathname = NULL;
217 temp_pathname = xstrdup (temp_pathname);
219 /* If the search in gdb_sysroot failed, and the path name is
220 absolute at this point, make it relative. (openp will try and open the
221 file according to its absolute path otherwise, which is not what we want.)
222 Affects subsequent searches for this solib. */
223 if (found_file < 0 && IS_ABSOLUTE_PATH (in_pathname))
225 /* First, get rid of any drive letters etc. */
226 while (!IS_DIR_SEPARATOR (*in_pathname))
229 /* Next, get rid of all leading dir separators. */
230 while (IS_DIR_SEPARATOR (*in_pathname))
234 /* If not found, search the solib_search_path (if any). */
235 if (found_file < 0 && solib_search_path != NULL)
236 found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST,
237 in_pathname, O_RDONLY | O_BINARY, &temp_pathname);
239 /* If not found, next search the solib_search_path (if any) for the basename
240 only (ignoring the path). This is to allow reading solibs from a path
241 that differs from the opened path. */
242 if (found_file < 0 && solib_search_path != NULL)
243 found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST,
244 lbasename (in_pathname), O_RDONLY | O_BINARY,
247 /* If not found, try to use target supplied solib search method */
248 if (found_file < 0 && ops->find_and_open_solib)
249 found_file = ops->find_and_open_solib (in_pathname, O_RDONLY | O_BINARY,
252 /* If not found, next search the inferior's $PATH environment variable. */
253 if (found_file < 0 && gdb_sysroot_is_empty)
254 found_file = openp (get_in_environ (current_inferior ()->environment,
256 OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY,
259 /* If not found, next search the inferior's $LD_LIBRARY_PATH
260 environment variable. */
261 if (found_file < 0 && gdb_sysroot_is_empty)
262 found_file = openp (get_in_environ (current_inferior ()->environment,
264 OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY,
268 return temp_pathname;
271 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
272 it is used as file handle to open the file. Throws an error if the file
273 could not be opened. Handles both local and remote file access.
275 PATHNAME must be malloc'ed by the caller. If successful, the new BFD's
276 name will point to it. If unsuccessful, PATHNAME will be freed and the
277 FD will be closed (unless FD was -1). */
280 solib_bfd_fopen (char *pathname, int fd)
284 if (remote_filename_p (pathname))
286 gdb_assert (fd == -1);
287 abfd = remote_bfd_open (pathname, gnutarget);
291 abfd = bfd_fopen (pathname, gnutarget, FOPEN_RB, fd);
294 bfd_set_cacheable (abfd, 1);
301 make_cleanup (xfree, pathname);
302 error (_("Could not open `%s' as an executable file: %s"),
303 pathname, bfd_errmsg (bfd_get_error ()));
309 /* Find shared library PATHNAME and open a BFD for it. */
312 solib_bfd_open (char *pathname)
314 char *found_pathname;
317 const struct bfd_arch_info *b;
319 /* Search for shared library file. */
320 found_pathname = solib_find (pathname, &found_file);
321 if (found_pathname == NULL)
323 /* Return failure if the file could not be found, so that we can
324 accumulate messages about missing libraries. */
328 perror_with_name (pathname);
331 /* Open bfd for shared library. */
332 abfd = solib_bfd_fopen (found_pathname, found_file);
334 /* Check bfd format. */
335 if (!bfd_check_format (abfd, bfd_object))
338 make_cleanup (xfree, found_pathname);
339 error (_("`%s': not in executable format: %s"),
340 found_pathname, bfd_errmsg (bfd_get_error ()));
343 /* Check bfd arch. */
344 b = gdbarch_bfd_arch_info (target_gdbarch);
345 if (!b->compatible (b, bfd_get_arch_info (abfd)))
346 warning (_("`%s': Shared library architecture %s is not compatible "
347 "with target architecture %s."), found_pathname,
348 bfd_get_arch_info (abfd)->printable_name, b->printable_name);
358 solib_map_sections -- open bfd and build sections for shared lib
362 static int solib_map_sections (struct so_list *so)
366 Given a pointer to one of the shared objects in our list
367 of mapped objects, use the recorded name to open a bfd
368 descriptor for the object, build a section table, and then
369 relocate all the section addresses by the base address at
370 which the shared object was mapped.
374 In most (all?) cases the shared object file name recorded in the
375 dynamic linkage tables will be a fully qualified pathname. For
376 cases where it isn't, do we really mimic the systems search
377 mechanism correctly in the below code (particularly the tilde
382 solib_map_sections (struct so_list *so)
384 struct target_so_ops *ops = solib_ops (target_gdbarch);
386 struct target_section *p;
387 struct cleanup *old_chain;
390 filename = tilde_expand (so->so_name);
391 old_chain = make_cleanup (xfree, filename);
392 abfd = ops->bfd_open (filename);
393 do_cleanups (old_chain);
398 /* Leave bfd open, core_xfer_memory and "info files" need it. */
399 so->abfd = gdb_bfd_ref (abfd);
401 /* copy full path name into so_name, so that later symbol_file_add
403 if (strlen (bfd_get_filename (abfd)) >= SO_NAME_MAX_PATH_SIZE)
404 error (_("Shared library file name is too long."));
405 strcpy (so->so_name, bfd_get_filename (abfd));
407 if (build_section_table (abfd, &so->sections, &so->sections_end))
409 error (_("Can't find the file sections in `%s': %s"),
410 bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
413 for (p = so->sections; p < so->sections_end; p++)
415 /* Relocate the section binding addresses as recorded in the shared
416 object's file by the base address to which the object was actually
418 ops->relocate_section_addresses (so, p);
420 /* If the target didn't provide information about the address
421 range of the shared object, assume we want the location of
422 the .text section. */
423 if (so->addr_low == 0 && so->addr_high == 0
424 && strcmp (p->the_bfd_section->name, ".text") == 0)
426 so->addr_low = p->addr;
427 so->addr_high = p->endaddr;
431 /* Add the shared object's sections to the current set of file
432 section tables. Do this immediately after mapping the object so
433 that later nodes in the list can query this object, as is needed
435 add_target_sections (so->sections, so->sections_end);
442 free_so --- free a `struct so_list' object
446 void free_so (struct so_list *so)
450 Free the storage associated with the `struct so_list' object SO.
451 If we have opened a BFD for SO, close it.
453 The caller is responsible for removing SO from whatever list it is
454 a member of. If we have placed SO's sections in some target's
455 section table, the caller is responsible for removing them.
457 This function doesn't mess with objfiles at all. If there is an
458 objfile associated with SO that needs to be removed, the caller is
459 responsible for taking care of that. */
462 free_so (struct so_list *so)
464 struct target_so_ops *ops = solib_ops (target_gdbarch);
467 xfree (so->sections);
469 gdb_bfd_unref (so->abfd);
477 /* Return address of first so_list entry in master shared object list. */
479 master_so_list (void)
484 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
485 be chatty about it. Return non-zero if any symbols were actually
489 solib_read_symbols (struct so_list *so, int flags)
491 const int from_tty = flags & SYMFILE_VERBOSE;
493 if (so->symbols_loaded)
495 if (from_tty || info_verbose)
496 printf_unfiltered (_("Symbols already loaded for %s\n"), so->so_name);
498 else if (so->abfd == NULL)
500 /* We've already warned about this library, when trying to open
505 volatile struct gdb_exception e;
507 TRY_CATCH (e, RETURN_MASK_ERROR)
509 struct section_addr_info *sap;
511 /* Have we already loaded this shared object? */
512 ALL_OBJFILES (so->objfile)
514 if (strcmp (so->objfile->name, so->so_name) == 0)
517 if (so->objfile != NULL)
520 sap = build_section_addr_info_from_section_table (so->sections,
522 so->objfile = symbol_file_add_from_bfd (so->abfd,
523 flags, sap, OBJF_SHARED);
524 free_section_addr_info (sap);
532 _("Error while reading shared library symbols:\n"));
536 if (from_tty || info_verbose)
537 printf_unfiltered (_("Loaded symbols for %s\n"), so->so_name);
538 so->symbols_loaded = 1;
548 update_solib_list --- synchronize GDB's shared object list with inferior's
552 void update_solib_list (int from_tty, struct target_ops *TARGET)
554 Extract the list of currently loaded shared objects from the
555 inferior, and compare it with the list of shared objects currently
556 in GDB's so_list_head list. Edit so_list_head to bring it in sync
557 with the inferior's new list.
559 If we notice that the inferior has unloaded some shared objects,
560 free any symbolic info GDB had read about those shared objects.
562 Don't load symbolic info for any new shared objects; just add them
563 to the list, and leave their symbols_loaded flag clear.
565 If FROM_TTY is non-null, feel free to print messages about what
568 If TARGET is non-null, add the sections of all new shared objects
569 to TARGET's section table. Note that this doesn't remove any
570 sections for shared objects that have been unloaded, and it
571 doesn't check to see if the new shared objects are already present in
572 the section table. But we only use this for core files and
573 processes we've just attached to, so that's okay. */
576 update_solib_list (int from_tty, struct target_ops *target)
578 struct target_so_ops *ops = solib_ops (target_gdbarch);
579 struct so_list *inferior = ops->current_sos();
580 struct so_list *gdb, **gdb_link;
582 /* We can reach here due to changing solib-search-path or the
583 sysroot, before having any inferior. */
584 if (target_has_execution && !ptid_equal (inferior_ptid, null_ptid))
586 struct inferior *inf = current_inferior ();
588 /* If we are attaching to a running process for which we
589 have not opened a symbol file, we may be able to get its
591 if (inf->attach_flag && symfile_objfile == NULL)
592 catch_errors (ops->open_symbol_file_object, &from_tty,
593 "Error reading attached process's symbol file.\n",
597 /* GDB and the inferior's dynamic linker each maintain their own
598 list of currently loaded shared objects; we want to bring the
599 former in sync with the latter. Scan both lists, seeing which
600 shared objects appear where. There are three cases:
602 - A shared object appears on both lists. This means that GDB
603 knows about it already, and it's still loaded in the inferior.
604 Nothing needs to happen.
606 - A shared object appears only on GDB's list. This means that
607 the inferior has unloaded it. We should remove the shared
608 object from GDB's tables.
610 - A shared object appears only on the inferior's list. This
611 means that it's just been loaded. We should add it to GDB's
614 So we walk GDB's list, checking each entry to see if it appears
615 in the inferior's list too. If it does, no action is needed, and
616 we remove it from the inferior's list. If it doesn't, the
617 inferior has unloaded it, and we remove it from GDB's list. By
618 the time we're done walking GDB's list, the inferior's list
619 contains only the new shared objects, which we then add. */
622 gdb_link = &so_list_head;
625 struct so_list *i = inferior;
626 struct so_list **i_link = &inferior;
628 /* Check to see whether the shared object *gdb also appears in
629 the inferior's current list. */
634 if (ops->same (gdb, i))
639 if (! strcmp (gdb->so_original_name, i->so_original_name))
647 /* If the shared object appears on the inferior's list too, then
648 it's still loaded, so we don't need to do anything. Delete
649 it from the inferior's list, and leave it on GDB's list. */
654 gdb_link = &gdb->next;
658 /* If it's not on the inferior's list, remove it from GDB's tables. */
661 /* Notify any observer that the shared object has been
662 unloaded before we remove it from GDB's tables. */
663 observer_notify_solib_unloaded (gdb);
665 *gdb_link = gdb->next;
667 /* Unless the user loaded it explicitly, free SO's objfile. */
668 if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED))
669 free_objfile (gdb->objfile);
671 /* Some targets' section tables might be referring to
672 sections from so->abfd; remove them. */
673 remove_target_sections (gdb->abfd);
680 /* Now the inferior's list contains only shared objects that don't
681 appear in GDB's list --- those that are newly loaded. Add them
682 to GDB's shared object list. */
686 const char *not_found_filename = NULL;
690 /* Add the new shared objects to GDB's list. */
691 *gdb_link = inferior;
693 /* Fill in the rest of each of the `struct so_list' nodes. */
694 for (i = inferior; i; i = i->next)
696 volatile struct gdb_exception e;
698 i->pspace = current_program_space;
700 TRY_CATCH (e, RETURN_MASK_ERROR)
702 /* Fill in the rest of the `struct so_list' node. */
703 if (!solib_map_sections (i))
706 if (not_found_filename == NULL)
707 not_found_filename = i->so_original_name;
712 exception_fprintf (gdb_stderr, e, _("\
713 Error while mapping shared library sections:\n"));
715 /* Notify any observer that the shared object has been
716 loaded now that we've added it to GDB's tables. */
717 observer_notify_solib_loaded (i);
720 /* If a library was not found, issue an appropriate warning
721 message. We have to use a single call to warning in case the
722 front end does something special with warnings, e.g., pop up
723 a dialog box. It Would Be Nice if we could get a "warning: "
724 prefix on each line in the CLI front end, though - it doesn't
729 Could not load shared library symbols for %s.\n\
730 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
732 else if (not_found > 1)
734 Could not load shared library symbols for %d libraries, e.g. %s.\n\
735 Use the \"info sharedlibrary\" command to see the complete listing.\n\
736 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
737 not_found, not_found_filename);
742 /* Return non-zero if NAME is the libpthread shared library.
744 Uses a fairly simplistic heuristic approach where we check
745 the file name against "/libpthread". This can lead to false
746 positives, but this should be good enough in practice. */
749 libpthread_name_p (const char *name)
751 return (strstr (name, "/libpthread") != NULL);
754 /* Return non-zero if SO is the libpthread shared library. */
757 libpthread_solib_p (struct so_list *so)
759 return libpthread_name_p (so->so_name);
764 solib_add -- read in symbol info for newly added shared libraries
768 void solib_add (char *pattern, int from_tty, struct target_ops
769 *TARGET, int readsyms)
773 Read in symbolic information for any shared objects whose names
774 match PATTERN. (If we've already read a shared object's symbol
775 info, leave it alone.) If PATTERN is zero, read them all.
777 If READSYMS is 0, defer reading symbolic information until later
778 but still do any needed low level processing.
780 FROM_TTY and TARGET are as described for update_solib_list, above. */
783 solib_add (char *pattern, int from_tty, struct target_ops *target, int readsyms)
789 char *re_err = re_comp (pattern);
792 error (_("Invalid regexp: %s"), re_err);
795 update_solib_list (from_tty, target);
797 /* Walk the list of currently loaded shared libraries, and read
798 symbols for any that match the pattern --- or any whose symbols
799 aren't already loaded, if no pattern was given. */
802 int loaded_any_symbols = 0;
804 SYMFILE_DEFER_BP_RESET | (from_tty ? SYMFILE_VERBOSE : 0);
806 for (gdb = so_list_head; gdb; gdb = gdb->next)
807 if (! pattern || re_exec (gdb->so_name))
809 /* Normally, we would read the symbols from that library
810 only if READSYMS is set. However, we're making a small
811 exception for the pthread library, because we sometimes
812 need the library symbols to be loaded in order to provide
813 thread support (x86-linux for instance). */
814 const int add_this_solib =
815 (readsyms || libpthread_solib_p (gdb));
818 if (add_this_solib && solib_read_symbols (gdb, flags))
819 loaded_any_symbols = 1;
822 if (loaded_any_symbols)
823 breakpoint_re_set ();
825 if (from_tty && pattern && ! any_matches)
827 ("No loaded shared libraries match the pattern `%s'.\n", pattern);
829 if (loaded_any_symbols)
831 struct target_so_ops *ops = solib_ops (target_gdbarch);
833 /* Getting new symbols may change our opinion about what is
835 reinit_frame_cache ();
837 ops->special_symbol_handling ();
847 info_sharedlibrary_command -- code for "info sharedlibrary"
851 static void info_sharedlibrary_command ()
855 Walk through the shared library list and print information
856 about each attached library matching PATTERN. If PATTERN is elided,
861 info_sharedlibrary_command (char *pattern, int from_tty)
863 struct so_list *so = NULL; /* link map state variable */
865 int so_missing_debug_info = 0;
868 struct cleanup *table_cleanup;
869 struct gdbarch *gdbarch = target_gdbarch;
873 char *re_err = re_comp (pattern);
876 error (_("Invalid regexp: %s"), re_err);
879 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
880 addr_width = 4 + (gdbarch_ptr_bit (gdbarch) / 4);
882 update_solib_list (from_tty, 0);
884 /* make_cleanup_ui_out_table_begin_end needs to know the number of
885 rows, so we need to make two passes over the libs. */
887 for (nr_libs = 0, so = so_list_head; so; so = so->next)
891 if (pattern && ! re_exec (so->so_name))
898 make_cleanup_ui_out_table_begin_end (uiout, 4, nr_libs,
899 "SharedLibraryTable");
901 /* The "- 1" is because ui_out adds one space between columns. */
902 ui_out_table_header (uiout, addr_width - 1, ui_left, "from", "From");
903 ui_out_table_header (uiout, addr_width - 1, ui_left, "to", "To");
904 ui_out_table_header (uiout, 12 - 1, ui_left, "syms-read", "Syms Read");
905 ui_out_table_header (uiout, 0, ui_noalign,
906 "name", "Shared Object Library");
908 ui_out_table_body (uiout);
910 for (so = so_list_head; so; so = so->next)
912 struct cleanup *lib_cleanup;
914 if (! so->so_name[0])
916 if (pattern && ! re_exec (so->so_name))
919 lib_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "lib");
921 if (so->addr_high != 0)
923 ui_out_field_core_addr (uiout, "from", gdbarch, so->addr_low);
924 ui_out_field_core_addr (uiout, "to", gdbarch, so->addr_high);
928 ui_out_field_skip (uiout, "from");
929 ui_out_field_skip (uiout, "to");
932 if (! ui_out_is_mi_like_p (interp_ui_out (top_level_interpreter ()))
933 && so->symbols_loaded
934 && !objfile_has_symbols (so->objfile))
936 so_missing_debug_info = 1;
937 ui_out_field_string (uiout, "syms-read", "Yes (*)");
940 ui_out_field_string (uiout, "syms-read",
941 so->symbols_loaded ? "Yes" : "No");
943 ui_out_field_string (uiout, "name", so->so_name);
945 ui_out_text (uiout, "\n");
947 do_cleanups (lib_cleanup);
950 do_cleanups (table_cleanup);
955 ui_out_message (uiout, 0,
956 _("No shared libraries matched.\n"));
958 ui_out_message (uiout, 0,
959 _("No shared libraries loaded at this time.\n"));
963 if (so_missing_debug_info)
964 ui_out_message (uiout, 0,
965 _("(*): Shared library is missing debugging information.\n"));
969 /* Return 1 if ADDRESS lies within SOLIB. */
972 solib_contains_address_p (const struct so_list *const solib,
975 struct target_section *p;
977 for (p = solib->sections; p < solib->sections_end; p++)
978 if (p->addr <= address && address < p->endaddr)
988 solib_name_from_address -- if an address is in a shared lib, return
993 char * solib_name_from_address (CORE_ADDR address)
997 Provides a hook for other gdb routines to discover whether or
998 not a particular address is within the mapped address space of
1001 For example, this routine is called at one point to disable
1002 breakpoints which are in shared libraries that are not currently
1007 solib_name_from_address (struct program_space *pspace, CORE_ADDR address)
1009 struct so_list *so = NULL;
1011 for (so = pspace->so_list; so; so = so->next)
1012 if (solib_contains_address_p (so, address))
1013 return (so->so_name);
1018 /* Return whether the data starting at VADDR, size SIZE, must be kept
1019 in a core file for shared libraries loaded before "gcore" is used
1020 to be handled correctly when the core file is loaded. This only
1021 applies when the section would otherwise not be kept in the core
1022 file (in particular, for readonly sections). */
1025 solib_keep_data_in_core (CORE_ADDR vaddr, unsigned long size)
1027 struct target_so_ops *ops = solib_ops (target_gdbarch);
1029 if (ops->keep_data_in_core)
1030 return ops->keep_data_in_core (vaddr, size);
1035 /* Called by free_all_symtabs */
1040 struct target_so_ops *ops = solib_ops (target_gdbarch);
1042 /* This function is expected to handle ELF shared libraries. It is
1043 also used on Solaris, which can run either ELF or a.out binaries
1044 (for compatibility with SunOS 4), both of which can use shared
1045 libraries. So we don't know whether we have an ELF executable or
1046 an a.out executable until the user chooses an executable file.
1048 ELF shared libraries don't get mapped into the address space
1049 until after the program starts, so we'd better not try to insert
1050 breakpoints in them immediately. We have to wait until the
1051 dynamic linker has loaded them; we'll hit a bp_shlib_event
1052 breakpoint (look for calls to create_solib_event_breakpoint) when
1055 SunOS shared libraries seem to be different --- they're present
1056 as soon as the process begins execution, so there's no need to
1057 put off inserting breakpoints. There's also nowhere to put a
1058 bp_shlib_event breakpoint, so if we put it off, we'll never get
1061 So: disable breakpoints only if we're using ELF shared libs. */
1062 if (exec_bfd != NULL
1063 && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour)
1064 disable_breakpoints_in_shlibs ();
1066 while (so_list_head)
1068 struct so_list *so = so_list_head;
1069 so_list_head = so->next;
1070 observer_notify_solib_unloaded (so);
1072 remove_target_sections (so->abfd);
1076 ops->clear_solib ();
1081 solib_create_inferior_hook -- shared library startup support
1085 void solib_create_inferior_hook (int from_tty)
1089 When gdb starts up the inferior, it nurses it along (through the
1090 shell) until it is ready to execute it's first instruction. At this
1091 point, this function gets called via expansion of the macro
1092 SOLIB_CREATE_INFERIOR_HOOK. */
1095 solib_create_inferior_hook (int from_tty)
1097 struct target_so_ops *ops = solib_ops (target_gdbarch);
1098 ops->solib_create_inferior_hook (from_tty);
1103 in_solib_dynsym_resolve_code -- check to see if an address is in
1104 dynamic loader's dynamic symbol
1109 int in_solib_dynsym_resolve_code (CORE_ADDR pc)
1113 Determine if PC is in the dynamic linker's symbol resolution
1114 code. Return 1 if so, 0 otherwise.
1118 in_solib_dynsym_resolve_code (CORE_ADDR pc)
1120 struct target_so_ops *ops = solib_ops (target_gdbarch);
1121 return ops->in_dynsym_resolve_code (pc);
1128 sharedlibrary_command -- handle command to explicitly add library
1132 static void sharedlibrary_command (char *args, int from_tty)
1139 sharedlibrary_command (char *args, int from_tty)
1142 solib_add (args, from_tty, (struct target_ops *) 0, 1);
1147 no_shared_libraries -- handle command to explicitly discard symbols
1148 from shared libraries.
1152 Implements the command "nosharedlibrary", which discards symbols
1153 that have been auto-loaded from shared libraries. Symbols from
1154 shared libraries that were added by explicit request of the user
1155 are not discarded. Also called from remote.c. */
1158 no_shared_libraries (char *ignored, int from_tty)
1160 /* The order of the two routines below is important: clear_solib notifies
1161 the solib_unloaded observers, and some of these observers might need
1162 access to their associated objfiles. Therefore, we can not purge the
1163 solibs' objfiles before clear_solib has been called. */
1166 objfile_purge_solibs ();
1170 reload_shared_libraries (char *ignored, int from_tty,
1171 struct cmd_list_element *e)
1173 no_shared_libraries (NULL, from_tty);
1174 /* Creating inferior hooks here has two purposes. First, if we reload
1175 shared libraries then the address of solib breakpoint we've computed
1176 previously might be no longer valid. For example, if we forgot to set
1177 solib-absolute-prefix and are setting it right now, then the previous
1178 breakpoint address is plain wrong. Second, installing solib hooks
1179 also implicitly figures were ld.so is and loads symbols for it.
1180 Absent this call, if we've just connected to a target and set
1181 solib-absolute-prefix or solib-search-path, we'll lose all information
1183 if (target_has_execution)
1185 #ifdef SOLIB_CREATE_INFERIOR_HOOK
1186 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
1188 solib_create_inferior_hook (from_tty);
1192 /* Sometimes the platform-specific hook loads initial shared
1193 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1194 incorrectly 0 but such solib targets should be fixed anyway. If we
1195 made all the inferior hook methods consistent, this call could be
1196 removed. Call it only after the solib target has been initialized by
1197 solib_create_inferior_hook. */
1199 solib_add (NULL, 0, NULL, auto_solib_add);
1201 /* We have unloaded and then reloaded debug info for all shared libraries.
1202 However, frames may still reference them, for example a frame's
1203 unwinder might still point of DWARF FDE structures that are now freed.
1204 Reinit frame cache to avoid crashing. */
1205 reinit_frame_cache ();
1209 show_auto_solib_add (struct ui_file *file, int from_tty,
1210 struct cmd_list_element *c, const char *value)
1212 fprintf_filtered (file, _("Autoloading of shared library symbols is %s.\n"),
1217 /* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call
1218 the library-specific handler if it is installed for the current target. */
1221 solib_global_lookup (const struct objfile *objfile,
1223 const domain_enum domain)
1225 struct target_so_ops *ops = solib_ops (target_gdbarch);
1227 if (ops->lookup_lib_global_symbol != NULL)
1228 return ops->lookup_lib_global_symbol (objfile, name, domain);
1233 extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */
1236 _initialize_solib (void)
1238 struct cmd_list_element *c;
1240 solib_data = gdbarch_data_register_pre_init (solib_init);
1242 add_com ("sharedlibrary", class_files, sharedlibrary_command,
1243 _("Load shared object library symbols for files matching REGEXP."));
1244 add_info ("sharedlibrary", info_sharedlibrary_command,
1245 _("Status of loaded shared object libraries."));
1246 add_com ("nosharedlibrary", class_files, no_shared_libraries,
1247 _("Unload all shared object library symbols."));
1249 add_setshow_boolean_cmd ("auto-solib-add", class_support,
1250 &auto_solib_add, _("\
1251 Set autoloading of shared library symbols."), _("\
1252 Show autoloading of shared library symbols."), _("\
1253 If \"on\", symbols from all shared object libraries will be loaded\n\
1254 automatically when the inferior begins execution, when the dynamic linker\n\
1255 informs gdb that a new library has been loaded, or when attaching to the\n\
1256 inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'."),
1258 show_auto_solib_add,
1259 &setlist, &showlist);
1261 add_setshow_filename_cmd ("sysroot", class_support,
1263 Set an alternate system root."), _("\
1264 Show the current system root."), _("\
1265 The system root is used to load absolute shared library symbol files.\n\
1266 For other (relative) files, you can add directories using\n\
1267 `set solib-search-path'."),
1268 reload_shared_libraries,
1270 &setlist, &showlist);
1272 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0,
1274 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0,
1277 add_setshow_optional_filename_cmd ("solib-search-path", class_support,
1278 &solib_search_path, _("\
1279 Set the search path for loading non-absolute shared library symbol files."), _("\
1280 Show the search path for loading non-absolute shared library symbol files."), _("\
1281 This takes precedence over the environment variables PATH and LD_LIBRARY_PATH."),
1282 reload_shared_libraries,
1283 show_solib_search_path,
1284 &setlist, &showlist);