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, 2011
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"
50 #include "filesystem.h"
52 /* Architecture-specific operations. */
54 /* Per-architecture data key. */
55 static struct gdbarch_data
*solib_data
;
58 solib_init (struct obstack
*obstack
)
60 struct target_so_ops
**ops
;
62 ops
= OBSTACK_ZALLOC (obstack
, struct target_so_ops
*);
63 *ops
= current_target_so_ops
;
67 static struct target_so_ops
*
68 solib_ops (struct gdbarch
*gdbarch
)
70 struct target_so_ops
**ops
= gdbarch_data (gdbarch
, solib_data
);
75 /* Set the solib operations for GDBARCH to NEW_OPS. */
78 set_solib_ops (struct gdbarch
*gdbarch
, struct target_so_ops
*new_ops
)
80 struct target_so_ops
**ops
= gdbarch_data (gdbarch
, solib_data
);
86 /* external data declarations */
88 /* FIXME: gdbarch needs to control this variable, or else every
89 configuration needs to call set_solib_ops. */
90 struct target_so_ops
*current_target_so_ops
;
92 /* List of known shared objects */
93 #define so_list_head current_program_space->so_list
95 /* Local function prototypes */
97 /* If non-empty, this is a search path for loading non-absolute shared library
98 symbol files. This takes precedence over the environment variables PATH
99 and LD_LIBRARY_PATH. */
100 static char *solib_search_path
= NULL
;
102 show_solib_search_path (struct ui_file
*file
, int from_tty
,
103 struct cmd_list_element
*c
, const char *value
)
105 fprintf_filtered (file
, _("The search path for loading non-absolute "
106 "shared library symbol files is %s.\n"),
110 /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
111 #if (HAVE_DOS_BASED_FILE_SYSTEM)
112 # define DOS_BASED_FILE_SYSTEM 1
114 # define DOS_BASED_FILE_SYSTEM 0
121 solib_find -- Find a shared library file.
125 char *solib_find (char *in_pathname, int *fd);
129 Global variable GDB_SYSROOT is used as a prefix directory
130 to search for shared libraries if they have an absolute path.
132 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
133 (or set of directories, as in LD_LIBRARY_PATH) to search for all
134 shared libraries if not found in GDB_SYSROOT.
137 * If there is a gdb_sysroot and path is absolute:
138 * Search for gdb_sysroot/path.
140 * Look for it literally (unmodified).
141 * Look in SOLIB_SEARCH_PATH.
142 * If available, use target defined search function.
143 * If gdb_sysroot is NOT set, perform the following two searches:
144 * Look in inferior's $PATH.
145 * Look in inferior's $LD_LIBRARY_PATH.
147 * The last check avoids doing this search when targetting remote
148 * machines since gdb_sysroot will almost always be set.
152 Full pathname of the shared library file, or NULL if not found.
153 (The pathname is malloc'ed; it needs to be freed by the caller.)
154 *FD is set to either -1 or an open file handle for the library. */
157 solib_find (char *in_pathname
, int *fd
)
159 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
161 char *temp_pathname
= NULL
;
162 int gdb_sysroot_is_empty
;
163 const char *solib_symbols_extension
164 = gdbarch_solib_symbols_extension (target_gdbarch
);
165 const char *fskind
= effective_target_file_system_kind ();
166 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
167 char *sysroot
= NULL
;
169 /* If solib_symbols_extension is set, replace the file's
171 if (solib_symbols_extension
)
173 char *p
= in_pathname
+ strlen (in_pathname
);
175 while (p
> in_pathname
&& *p
!= '.')
182 new_pathname
= alloca (p
- in_pathname
+ 1
183 + strlen (solib_symbols_extension
) + 1);
184 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
185 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
186 solib_symbols_extension
);
188 in_pathname
= new_pathname
;
192 gdb_sysroot_is_empty
= (gdb_sysroot
== NULL
|| *gdb_sysroot
== 0);
194 if (!gdb_sysroot_is_empty
)
196 int prefix_len
= strlen (gdb_sysroot
);
198 /* Remove trailing slashes from absolute prefix. */
199 while (prefix_len
> 0
200 && IS_DIR_SEPARATOR (gdb_sysroot
[prefix_len
- 1]))
203 sysroot
= savestring (gdb_sysroot
, prefix_len
);
204 make_cleanup (xfree
, sysroot
);
207 /* If we're on a non-DOS-based system, backslashes won't be
208 understood as directory separator, so, convert them to forward
209 slashes, iff we're supposed to handle DOS-based file system
210 semantics for target paths. */
211 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
215 /* Avoid clobbering our input. */
216 p
= alloca (strlen (in_pathname
) + 1);
217 strcpy (p
, in_pathname
);
227 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
228 IS_ABSOLUTE_PATH. The latter is for host paths only, while
229 IN_PATHNAME is a target path. For example, if we're supposed to
230 be handling DOS-like semantics we want to consider a
231 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
232 With such a path, before giving up on the sysroot, we'll try:
234 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
235 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
236 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
239 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || gdb_sysroot_is_empty
)
240 temp_pathname
= xstrdup (in_pathname
);
243 int need_dir_separator
;
245 need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[0]);
247 /* Cat the prefixed pathname together. */
248 temp_pathname
= concat (sysroot
,
249 need_dir_separator
? SLASH_STRING
: "",
250 in_pathname
, (char *) NULL
);
253 /* Handle remote files. */
254 if (remote_filename_p (temp_pathname
))
257 return temp_pathname
;
260 /* Now see if we can open it. */
261 found_file
= open (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
263 xfree (temp_pathname
);
265 /* If the search in gdb_sysroot failed, and the path name has a
266 drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
267 and retrying in the sysroot:
268 c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
271 && !gdb_sysroot_is_empty
272 && HAS_TARGET_DRIVE_SPEC (fskind
, in_pathname
))
274 int need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
275 char *drive
= savestring (in_pathname
, 1);
277 temp_pathname
= concat (sysroot
,
280 need_dir_separator
? SLASH_STRING
: "",
281 in_pathname
+ 2, (char *) NULL
);
284 found_file
= open (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
287 xfree (temp_pathname
);
289 /* If the search in gdb_sysroot still failed, try fully
290 stripping the drive spec, and trying once more in the
291 sysroot before giving up.
293 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
295 temp_pathname
= concat (sysroot
,
296 need_dir_separator
? SLASH_STRING
: "",
297 in_pathname
+ 2, (char *) NULL
);
299 found_file
= open (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
301 xfree (temp_pathname
);
305 do_cleanups (old_chain
);
307 /* We try to find the library in various ways. After each attempt,
308 either found_file >= 0 and temp_pathname is a malloc'd string, or
309 found_file < 0 and temp_pathname does not point to storage that
310 needs to be freed. */
313 temp_pathname
= NULL
;
315 /* If not found, search the solib_search_path (if any). */
316 if (found_file
< 0 && solib_search_path
!= NULL
)
317 found_file
= openp (solib_search_path
, OPF_TRY_CWD_FIRST
,
318 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
320 /* If the search in gdb_sysroot failed, and the path name is
321 absolute at this point, make it relative. (openp will try and open the
322 file according to its absolute path otherwise, which is not what we want.)
323 Affects subsequent searches for this solib. */
324 if (found_file
< 0 && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
326 /* First, get rid of any drive letters etc. */
327 while (!IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
330 /* Next, get rid of all leading dir separators. */
331 while (IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
335 /* If not found, search the solib_search_path (if any). */
336 if (found_file
< 0 && solib_search_path
!= NULL
)
337 found_file
= openp (solib_search_path
, OPF_TRY_CWD_FIRST
,
338 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
340 /* If not found, next search the solib_search_path (if any) for the basename
341 only (ignoring the path). This is to allow reading solibs from a path
342 that differs from the opened path. */
343 if (found_file
< 0 && solib_search_path
!= NULL
)
344 found_file
= openp (solib_search_path
, OPF_TRY_CWD_FIRST
,
345 target_lbasename (fskind
, in_pathname
),
346 O_RDONLY
| O_BINARY
, &temp_pathname
);
348 /* If not found, try to use target supplied solib search method. */
349 if (found_file
< 0 && ops
->find_and_open_solib
)
350 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
353 /* If not found, next search the inferior's $PATH environment variable. */
354 if (found_file
< 0 && gdb_sysroot_is_empty
)
355 found_file
= openp (get_in_environ (current_inferior ()->environment
,
357 OPF_TRY_CWD_FIRST
, in_pathname
, O_RDONLY
| O_BINARY
,
360 /* If not found, next search the inferior's $LD_LIBRARY_PATH
361 environment variable. */
362 if (found_file
< 0 && gdb_sysroot_is_empty
)
363 found_file
= openp (get_in_environ (current_inferior ()->environment
,
365 OPF_TRY_CWD_FIRST
, in_pathname
, O_RDONLY
| O_BINARY
,
369 return temp_pathname
;
372 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
373 it is used as file handle to open the file. Throws an error if the file
374 could not be opened. Handles both local and remote file access.
376 PATHNAME must be malloc'ed by the caller. If successful, the new BFD's
377 name will point to it. If unsuccessful, PATHNAME will be freed and the
378 FD will be closed (unless FD was -1). */
381 solib_bfd_fopen (char *pathname
, int fd
)
385 if (remote_filename_p (pathname
))
387 gdb_assert (fd
== -1);
388 abfd
= remote_bfd_open (pathname
, gnutarget
);
392 abfd
= bfd_fopen (pathname
, gnutarget
, FOPEN_RB
, fd
);
395 bfd_set_cacheable (abfd
, 1);
402 make_cleanup (xfree
, pathname
);
403 error (_("Could not open `%s' as an executable file: %s"),
404 pathname
, bfd_errmsg (bfd_get_error ()));
410 /* Find shared library PATHNAME and open a BFD for it. */
413 solib_bfd_open (char *pathname
)
415 char *found_pathname
;
418 const struct bfd_arch_info
*b
;
420 /* Search for shared library file. */
421 found_pathname
= solib_find (pathname
, &found_file
);
422 if (found_pathname
== NULL
)
424 /* Return failure if the file could not be found, so that we can
425 accumulate messages about missing libraries. */
429 perror_with_name (pathname
);
432 /* Open bfd for shared library. */
433 abfd
= solib_bfd_fopen (found_pathname
, found_file
);
435 /* Check bfd format. */
436 if (!bfd_check_format (abfd
, bfd_object
))
439 make_cleanup (xfree
, found_pathname
);
440 error (_("`%s': not in executable format: %s"),
441 found_pathname
, bfd_errmsg (bfd_get_error ()));
444 /* Check bfd arch. */
445 b
= gdbarch_bfd_arch_info (target_gdbarch
);
446 if (!b
->compatible (b
, bfd_get_arch_info (abfd
)))
447 warning (_("`%s': Shared library architecture %s is not compatible "
448 "with target architecture %s."), found_pathname
,
449 bfd_get_arch_info (abfd
)->printable_name
, b
->printable_name
);
459 solib_map_sections -- open bfd and build sections for shared lib
463 static int solib_map_sections (struct so_list *so)
467 Given a pointer to one of the shared objects in our list
468 of mapped objects, use the recorded name to open a bfd
469 descriptor for the object, build a section table, and then
470 relocate all the section addresses by the base address at
471 which the shared object was mapped.
475 In most (all?) cases the shared object file name recorded in the
476 dynamic linkage tables will be a fully qualified pathname. For
477 cases where it isn't, do we really mimic the systems search
478 mechanism correctly in the below code (particularly the tilde
483 solib_map_sections (struct so_list
*so
)
485 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
487 struct target_section
*p
;
488 struct cleanup
*old_chain
;
491 filename
= tilde_expand (so
->so_name
);
492 old_chain
= make_cleanup (xfree
, filename
);
493 abfd
= ops
->bfd_open (filename
);
494 do_cleanups (old_chain
);
499 /* Leave bfd open, core_xfer_memory and "info files" need it. */
500 so
->abfd
= gdb_bfd_ref (abfd
);
502 /* copy full path name into so_name, so that later symbol_file_add
504 if (strlen (bfd_get_filename (abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
505 error (_("Shared library file name is too long."));
506 strcpy (so
->so_name
, bfd_get_filename (abfd
));
508 if (build_section_table (abfd
, &so
->sections
, &so
->sections_end
))
510 error (_("Can't find the file sections in `%s': %s"),
511 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
514 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
516 /* Relocate the section binding addresses as recorded in the shared
517 object's file by the base address to which the object was actually
519 ops
->relocate_section_addresses (so
, p
);
521 /* If the target didn't provide information about the address
522 range of the shared object, assume we want the location of
523 the .text section. */
524 if (so
->addr_low
== 0 && so
->addr_high
== 0
525 && strcmp (p
->the_bfd_section
->name
, ".text") == 0)
527 so
->addr_low
= p
->addr
;
528 so
->addr_high
= p
->endaddr
;
532 /* Add the shared object's sections to the current set of file
533 section tables. Do this immediately after mapping the object so
534 that later nodes in the list can query this object, as is needed
536 add_target_sections (so
->sections
, so
->sections_end
);
541 /* Free symbol-file related contents of SO. If we have opened a BFD
542 for SO, close it. If we have placed SO's sections in some target's
543 section table, the caller is responsible for removing them.
545 This function doesn't mess with objfiles at all. If there is an
546 objfile associated with SO that needs to be removed, the caller is
547 responsible for taking care of that. */
550 free_so_symbols (struct so_list
*so
)
554 xfree (so
->sections
);
555 so
->sections
= so
->sections_end
= NULL
;
558 gdb_bfd_unref (so
->abfd
);
561 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
562 so
->symbols_loaded
= 0;
565 so
->addr_low
= so
->addr_high
= 0;
567 /* Restore the target-supplied file name. SO_NAME may be the path
568 of the symbol file. */
569 strcpy (so
->so_name
, so
->so_original_name
);
574 free_so --- free a `struct so_list' object
578 void free_so (struct so_list *so)
582 Free the storage associated with the `struct so_list' object SO.
583 If we have opened a BFD for SO, close it.
585 The caller is responsible for removing SO from whatever list it is
586 a member of. If we have placed SO's sections in some target's
587 section table, the caller is responsible for removing them.
589 This function doesn't mess with objfiles at all. If there is an
590 objfile associated with SO that needs to be removed, the caller is
591 responsible for taking care of that. */
594 free_so (struct so_list
*so
)
596 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
598 free_so_symbols (so
);
605 /* Return address of first so_list entry in master shared object list. */
607 master_so_list (void)
612 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
613 be chatty about it. Return non-zero if any symbols were actually
617 solib_read_symbols (struct so_list
*so
, int flags
)
619 const int from_tty
= flags
& SYMFILE_VERBOSE
;
621 if (so
->symbols_loaded
)
623 /* If needed, we've already warned in our caller. */
625 else if (so
->abfd
== NULL
)
627 /* We've already warned about this library, when trying to open
632 volatile struct gdb_exception e
;
634 TRY_CATCH (e
, RETURN_MASK_ERROR
)
636 struct section_addr_info
*sap
;
638 /* Have we already loaded this shared object? */
639 ALL_OBJFILES (so
->objfile
)
641 if (filename_cmp (so
->objfile
->name
, so
->so_name
) == 0
642 && so
->objfile
->addr_low
== so
->addr_low
)
645 if (so
->objfile
!= NULL
)
648 sap
= build_section_addr_info_from_section_table (so
->sections
,
650 so
->objfile
= symbol_file_add_from_bfd (so
->abfd
,
651 flags
, sap
, OBJF_SHARED
);
652 so
->objfile
->addr_low
= so
->addr_low
;
653 free_section_addr_info (sap
);
657 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
658 " library symbols for %s:\n"),
662 if (from_tty
|| info_verbose
)
663 printf_unfiltered (_("Loaded symbols for %s\n"), so
->so_name
);
664 so
->symbols_loaded
= 1;
674 update_solib_list --- synchronize GDB's shared object list with inferior's
678 void update_solib_list (int from_tty, struct target_ops *TARGET)
680 Extract the list of currently loaded shared objects from the
681 inferior, and compare it with the list of shared objects currently
682 in GDB's so_list_head list. Edit so_list_head to bring it in sync
683 with the inferior's new list.
685 If we notice that the inferior has unloaded some shared objects,
686 free any symbolic info GDB had read about those shared objects.
688 Don't load symbolic info for any new shared objects; just add them
689 to the list, and leave their symbols_loaded flag clear.
691 If FROM_TTY is non-null, feel free to print messages about what
694 If TARGET is non-null, add the sections of all new shared objects
695 to TARGET's section table. Note that this doesn't remove any
696 sections for shared objects that have been unloaded, and it
697 doesn't check to see if the new shared objects are already present in
698 the section table. But we only use this for core files and
699 processes we've just attached to, so that's okay. */
702 update_solib_list (int from_tty
, struct target_ops
*target
)
704 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
705 struct so_list
*inferior
= ops
->current_sos();
706 struct so_list
*gdb
, **gdb_link
;
708 /* We can reach here due to changing solib-search-path or the
709 sysroot, before having any inferior. */
710 if (target_has_execution
&& !ptid_equal (inferior_ptid
, null_ptid
))
712 struct inferior
*inf
= current_inferior ();
714 /* If we are attaching to a running process for which we
715 have not opened a symbol file, we may be able to get its
717 if (inf
->attach_flag
&& symfile_objfile
== NULL
)
718 catch_errors (ops
->open_symbol_file_object
, &from_tty
,
719 "Error reading attached process's symbol file.\n",
723 /* GDB and the inferior's dynamic linker each maintain their own
724 list of currently loaded shared objects; we want to bring the
725 former in sync with the latter. Scan both lists, seeing which
726 shared objects appear where. There are three cases:
728 - A shared object appears on both lists. This means that GDB
729 knows about it already, and it's still loaded in the inferior.
730 Nothing needs to happen.
732 - A shared object appears only on GDB's list. This means that
733 the inferior has unloaded it. We should remove the shared
734 object from GDB's tables.
736 - A shared object appears only on the inferior's list. This
737 means that it's just been loaded. We should add it to GDB's
740 So we walk GDB's list, checking each entry to see if it appears
741 in the inferior's list too. If it does, no action is needed, and
742 we remove it from the inferior's list. If it doesn't, the
743 inferior has unloaded it, and we remove it from GDB's list. By
744 the time we're done walking GDB's list, the inferior's list
745 contains only the new shared objects, which we then add. */
748 gdb_link
= &so_list_head
;
751 struct so_list
*i
= inferior
;
752 struct so_list
**i_link
= &inferior
;
754 /* Check to see whether the shared object *gdb also appears in
755 the inferior's current list. */
760 if (ops
->same (gdb
, i
))
765 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
773 /* If the shared object appears on the inferior's list too, then
774 it's still loaded, so we don't need to do anything. Delete
775 it from the inferior's list, and leave it on GDB's list. */
780 gdb_link
= &gdb
->next
;
784 /* If it's not on the inferior's list, remove it from GDB's tables. */
787 /* Notify any observer that the shared object has been
788 unloaded before we remove it from GDB's tables. */
789 observer_notify_solib_unloaded (gdb
);
791 *gdb_link
= gdb
->next
;
793 /* Unless the user loaded it explicitly, free SO's objfile. */
794 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
))
795 free_objfile (gdb
->objfile
);
797 /* Some targets' section tables might be referring to
798 sections from so->abfd; remove them. */
799 remove_target_sections (gdb
->abfd
);
806 /* Now the inferior's list contains only shared objects that don't
807 appear in GDB's list --- those that are newly loaded. Add them
808 to GDB's shared object list. */
812 const char *not_found_filename
= NULL
;
816 /* Add the new shared objects to GDB's list. */
817 *gdb_link
= inferior
;
819 /* Fill in the rest of each of the `struct so_list' nodes. */
820 for (i
= inferior
; i
; i
= i
->next
)
822 volatile struct gdb_exception e
;
824 i
->pspace
= current_program_space
;
826 TRY_CATCH (e
, RETURN_MASK_ERROR
)
828 /* Fill in the rest of the `struct so_list' node. */
829 if (!solib_map_sections (i
))
832 if (not_found_filename
== NULL
)
833 not_found_filename
= i
->so_original_name
;
838 exception_fprintf (gdb_stderr
, e
,
839 _("Error while mapping shared "
840 "library sections:\n"));
842 /* Notify any observer that the shared object has been
843 loaded now that we've added it to GDB's tables. */
844 observer_notify_solib_loaded (i
);
847 /* If a library was not found, issue an appropriate warning
848 message. We have to use a single call to warning in case the
849 front end does something special with warnings, e.g., pop up
850 a dialog box. It Would Be Nice if we could get a "warning: "
851 prefix on each line in the CLI front end, though - it doesn't
855 warning (_("Could not load shared library symbols for %s.\n"
856 "Do you need \"set solib-search-path\" "
857 "or \"set sysroot\"?"),
859 else if (not_found
> 1)
861 Could not load shared library symbols for %d libraries, e.g. %s.\n\
862 Use the \"info sharedlibrary\" command to see the complete listing.\n\
863 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
864 not_found
, not_found_filename
);
869 /* Return non-zero if NAME is the libpthread shared library.
871 Uses a fairly simplistic heuristic approach where we check
872 the file name against "/libpthread". This can lead to false
873 positives, but this should be good enough in practice. */
876 libpthread_name_p (const char *name
)
878 return (strstr (name
, "/libpthread") != NULL
);
881 /* Return non-zero if SO is the libpthread shared library. */
884 libpthread_solib_p (struct so_list
*so
)
886 return libpthread_name_p (so
->so_name
);
891 solib_add -- read in symbol info for newly added shared libraries
895 void solib_add (char *pattern, int from_tty, struct target_ops
896 *TARGET, int readsyms)
900 Read in symbolic information for any shared objects whose names
901 match PATTERN. (If we've already read a shared object's symbol
902 info, leave it alone.) If PATTERN is zero, read them all.
904 If READSYMS is 0, defer reading symbolic information until later
905 but still do any needed low level processing.
907 FROM_TTY and TARGET are as described for update_solib_list, above. */
910 solib_add (char *pattern
, int from_tty
,
911 struct target_ops
*target
, int readsyms
)
917 char *re_err
= re_comp (pattern
);
920 error (_("Invalid regexp: %s"), re_err
);
923 update_solib_list (from_tty
, target
);
925 /* Walk the list of currently loaded shared libraries, and read
926 symbols for any that match the pattern --- or any whose symbols
927 aren't already loaded, if no pattern was given. */
930 int loaded_any_symbols
= 0;
932 SYMFILE_DEFER_BP_RESET
| (from_tty
? SYMFILE_VERBOSE
: 0);
934 for (gdb
= so_list_head
; gdb
; gdb
= gdb
->next
)
935 if (! pattern
|| re_exec (gdb
->so_name
))
937 /* Normally, we would read the symbols from that library
938 only if READSYMS is set. However, we're making a small
939 exception for the pthread library, because we sometimes
940 need the library symbols to be loaded in order to provide
941 thread support (x86-linux for instance). */
942 const int add_this_solib
=
943 (readsyms
|| libpthread_solib_p (gdb
));
948 if (gdb
->symbols_loaded
)
950 /* If no pattern was given, be quiet for shared
951 libraries we have already loaded. */
952 if (pattern
&& (from_tty
|| info_verbose
))
953 printf_unfiltered (_("Symbols already loaded for %s\n"),
956 else if (solib_read_symbols (gdb
, flags
))
957 loaded_any_symbols
= 1;
961 if (loaded_any_symbols
)
962 breakpoint_re_set ();
964 if (from_tty
&& pattern
&& ! any_matches
)
966 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
968 if (loaded_any_symbols
)
970 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
972 /* Getting new symbols may change our opinion about what is
974 reinit_frame_cache ();
976 ops
->special_symbol_handling ();
986 info_sharedlibrary_command -- code for "info sharedlibrary"
990 static void info_sharedlibrary_command ()
994 Walk through the shared library list and print information
995 about each attached library matching PATTERN. If PATTERN is elided,
1000 info_sharedlibrary_command (char *pattern
, int from_tty
)
1002 struct so_list
*so
= NULL
; /* link map state variable */
1003 int so_missing_debug_info
= 0;
1006 struct cleanup
*table_cleanup
;
1007 struct gdbarch
*gdbarch
= target_gdbarch
;
1011 char *re_err
= re_comp (pattern
);
1014 error (_("Invalid regexp: %s"), re_err
);
1017 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1018 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1020 update_solib_list (from_tty
, 0);
1022 /* make_cleanup_ui_out_table_begin_end needs to know the number of
1023 rows, so we need to make two passes over the libs. */
1025 for (nr_libs
= 0, so
= so_list_head
; so
; so
= so
->next
)
1029 if (pattern
&& ! re_exec (so
->so_name
))
1036 make_cleanup_ui_out_table_begin_end (uiout
, 4, nr_libs
,
1037 "SharedLibraryTable");
1039 /* The "- 1" is because ui_out adds one space between columns. */
1040 ui_out_table_header (uiout
, addr_width
- 1, ui_left
, "from", "From");
1041 ui_out_table_header (uiout
, addr_width
- 1, ui_left
, "to", "To");
1042 ui_out_table_header (uiout
, 12 - 1, ui_left
, "syms-read", "Syms Read");
1043 ui_out_table_header (uiout
, 0, ui_noalign
,
1044 "name", "Shared Object Library");
1046 ui_out_table_body (uiout
);
1048 for (so
= so_list_head
; so
; so
= so
->next
)
1050 struct cleanup
*lib_cleanup
;
1052 if (! so
->so_name
[0])
1054 if (pattern
&& ! re_exec (so
->so_name
))
1057 lib_cleanup
= make_cleanup_ui_out_tuple_begin_end (uiout
, "lib");
1059 if (so
->addr_high
!= 0)
1061 ui_out_field_core_addr (uiout
, "from", gdbarch
, so
->addr_low
);
1062 ui_out_field_core_addr (uiout
, "to", gdbarch
, so
->addr_high
);
1066 ui_out_field_skip (uiout
, "from");
1067 ui_out_field_skip (uiout
, "to");
1070 if (! ui_out_is_mi_like_p (interp_ui_out (top_level_interpreter ()))
1071 && so
->symbols_loaded
1072 && !objfile_has_symbols (so
->objfile
))
1074 so_missing_debug_info
= 1;
1075 ui_out_field_string (uiout
, "syms-read", "Yes (*)");
1078 ui_out_field_string (uiout
, "syms-read",
1079 so
->symbols_loaded
? "Yes" : "No");
1081 ui_out_field_string (uiout
, "name", so
->so_name
);
1083 ui_out_text (uiout
, "\n");
1085 do_cleanups (lib_cleanup
);
1088 do_cleanups (table_cleanup
);
1093 ui_out_message (uiout
, 0,
1094 _("No shared libraries matched.\n"));
1096 ui_out_message (uiout
, 0,
1097 _("No shared libraries loaded at this time.\n"));
1101 if (so_missing_debug_info
)
1102 ui_out_message (uiout
, 0,
1103 _("(*): Shared library is missing "
1104 "debugging information.\n"));
1108 /* Return 1 if ADDRESS lies within SOLIB. */
1111 solib_contains_address_p (const struct so_list
*const solib
,
1114 struct target_section
*p
;
1116 for (p
= solib
->sections
; p
< solib
->sections_end
; p
++)
1117 if (p
->addr
<= address
&& address
< p
->endaddr
)
1127 solib_name_from_address -- if an address is in a shared lib, return
1132 char * solib_name_from_address (CORE_ADDR address)
1136 Provides a hook for other gdb routines to discover whether or
1137 not a particular address is within the mapped address space of
1140 For example, this routine is called at one point to disable
1141 breakpoints which are in shared libraries that are not currently
1146 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1148 struct so_list
*so
= NULL
;
1150 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1151 if (solib_contains_address_p (so
, address
))
1152 return (so
->so_name
);
1157 /* Return whether the data starting at VADDR, size SIZE, must be kept
1158 in a core file for shared libraries loaded before "gcore" is used
1159 to be handled correctly when the core file is loaded. This only
1160 applies when the section would otherwise not be kept in the core
1161 file (in particular, for readonly sections). */
1164 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1166 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
1168 if (ops
->keep_data_in_core
)
1169 return ops
->keep_data_in_core (vaddr
, size
);
1174 /* Called by free_all_symtabs */
1179 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
1181 /* This function is expected to handle ELF shared libraries. It is
1182 also used on Solaris, which can run either ELF or a.out binaries
1183 (for compatibility with SunOS 4), both of which can use shared
1184 libraries. So we don't know whether we have an ELF executable or
1185 an a.out executable until the user chooses an executable file.
1187 ELF shared libraries don't get mapped into the address space
1188 until after the program starts, so we'd better not try to insert
1189 breakpoints in them immediately. We have to wait until the
1190 dynamic linker has loaded them; we'll hit a bp_shlib_event
1191 breakpoint (look for calls to create_solib_event_breakpoint) when
1194 SunOS shared libraries seem to be different --- they're present
1195 as soon as the process begins execution, so there's no need to
1196 put off inserting breakpoints. There's also nowhere to put a
1197 bp_shlib_event breakpoint, so if we put it off, we'll never get
1200 So: disable breakpoints only if we're using ELF shared libs. */
1201 if (exec_bfd
!= NULL
1202 && bfd_get_flavour (exec_bfd
) != bfd_target_aout_flavour
)
1203 disable_breakpoints_in_shlibs ();
1205 while (so_list_head
)
1207 struct so_list
*so
= so_list_head
;
1209 so_list_head
= so
->next
;
1210 observer_notify_solib_unloaded (so
);
1212 remove_target_sections (so
->abfd
);
1216 ops
->clear_solib ();
1221 solib_create_inferior_hook -- shared library startup support
1225 void solib_create_inferior_hook (int from_tty)
1229 When gdb starts up the inferior, it nurses it along (through the
1230 shell) until it is ready to execute it's first instruction. At this
1231 point, this function gets called via expansion of the macro
1232 SOLIB_CREATE_INFERIOR_HOOK. */
1235 solib_create_inferior_hook (int from_tty
)
1237 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
1239 ops
->solib_create_inferior_hook (from_tty
);
1244 in_solib_dynsym_resolve_code -- check to see if an address is in
1245 dynamic loader's dynamic symbol
1250 int in_solib_dynsym_resolve_code (CORE_ADDR pc)
1254 Determine if PC is in the dynamic linker's symbol resolution
1255 code. Return 1 if so, 0 otherwise.
1259 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1261 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
1263 return ops
->in_dynsym_resolve_code (pc
);
1270 sharedlibrary_command -- handle command to explicitly add library
1274 static void sharedlibrary_command (char *args, int from_tty)
1281 sharedlibrary_command (char *args
, int from_tty
)
1284 solib_add (args
, from_tty
, (struct target_ops
*) 0, 1);
1289 no_shared_libraries -- handle command to explicitly discard symbols
1290 from shared libraries.
1294 Implements the command "nosharedlibrary", which discards symbols
1295 that have been auto-loaded from shared libraries. Symbols from
1296 shared libraries that were added by explicit request of the user
1297 are not discarded. Also called from remote.c. */
1300 no_shared_libraries (char *ignored
, int from_tty
)
1302 /* The order of the two routines below is important: clear_solib notifies
1303 the solib_unloaded observers, and some of these observers might need
1304 access to their associated objfiles. Therefore, we can not purge the
1305 solibs' objfiles before clear_solib has been called. */
1308 objfile_purge_solibs ();
1311 /* Reload shared libraries, but avoid reloading the same symbol file
1312 we already have loaded. */
1315 reload_shared_libraries_1 (int from_tty
)
1318 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
1320 for (so
= so_list_head
; so
!= NULL
; so
= so
->next
)
1322 char *filename
, *found_pathname
= NULL
;
1324 int was_loaded
= so
->symbols_loaded
;
1326 SYMFILE_DEFER_BP_RESET
| (from_tty
? SYMFILE_VERBOSE
: 0);
1328 filename
= tilde_expand (so
->so_original_name
);
1329 make_cleanup (xfree
, filename
);
1330 abfd
= solib_bfd_open (filename
);
1333 found_pathname
= xstrdup (bfd_get_filename (abfd
));
1334 make_cleanup (xfree
, found_pathname
);
1335 gdb_bfd_close_or_warn (abfd
);
1338 /* If this shared library is no longer associated with its previous
1339 symbol file, close that. */
1340 if ((found_pathname
== NULL
&& was_loaded
)
1341 || (found_pathname
!= NULL
1342 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1344 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
))
1345 free_objfile (so
->objfile
);
1346 remove_target_sections (so
->abfd
);
1347 free_so_symbols (so
);
1350 /* If this shared library is now associated with a new symbol
1352 if (found_pathname
!= NULL
1354 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1356 volatile struct gdb_exception e
;
1358 TRY_CATCH (e
, RETURN_MASK_ERROR
)
1359 solib_map_sections (so
);
1362 exception_fprintf (gdb_stderr
, e
,
1363 _("Error while mapping "
1364 "shared library sections:\n"));
1365 else if (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
))
1366 solib_read_symbols (so
, flags
);
1370 do_cleanups (old_chain
);
1374 reload_shared_libraries (char *ignored
, int from_tty
,
1375 struct cmd_list_element
*e
)
1377 struct target_so_ops
*ops
;
1379 reload_shared_libraries_1 (from_tty
);
1381 ops
= solib_ops (target_gdbarch
);
1383 /* Creating inferior hooks here has two purposes. First, if we reload
1384 shared libraries then the address of solib breakpoint we've computed
1385 previously might be no longer valid. For example, if we forgot to set
1386 solib-absolute-prefix and are setting it right now, then the previous
1387 breakpoint address is plain wrong. Second, installing solib hooks
1388 also implicitly figures were ld.so is and loads symbols for it.
1389 Absent this call, if we've just connected to a target and set
1390 solib-absolute-prefix or solib-search-path, we'll lose all information
1392 if (target_has_execution
)
1394 /* Reset or free private data structures not associated with
1396 ops
->clear_solib ();
1398 /* Remove any previous solib event breakpoint. This is usually
1399 done in common code, at breakpoint_init_inferior time, but
1400 we're not really starting up the inferior here. */
1401 remove_solib_event_breakpoints ();
1403 #ifdef SOLIB_CREATE_INFERIOR_HOOK
1404 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
1406 solib_create_inferior_hook (from_tty
);
1410 /* Sometimes the platform-specific hook loads initial shared
1411 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1412 incorrectly 0 but such solib targets should be fixed anyway. If we
1413 made all the inferior hook methods consistent, this call could be
1414 removed. Call it only after the solib target has been initialized by
1415 solib_create_inferior_hook. */
1417 solib_add (NULL
, 0, NULL
, auto_solib_add
);
1419 breakpoint_re_set ();
1421 /* We may have loaded or unloaded debug info for some (or all)
1422 shared libraries. However, frames may still reference them. For
1423 example, a frame's unwinder might still point at DWARF FDE
1424 structures that are now freed. Also, getting new symbols may
1425 change our opinion about what is frameless. */
1426 reinit_frame_cache ();
1428 ops
->special_symbol_handling ();
1432 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1433 struct cmd_list_element
*c
, const char *value
)
1435 fprintf_filtered (file
, _("Autoloading of shared library symbols is %s.\n"),
1440 /* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call
1441 the library-specific handler if it is installed for the current target. */
1444 solib_global_lookup (const struct objfile
*objfile
,
1446 const domain_enum domain
)
1448 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
1450 if (ops
->lookup_lib_global_symbol
!= NULL
)
1451 return ops
->lookup_lib_global_symbol (objfile
, name
, domain
);
1456 extern initialize_file_ftype _initialize_solib
; /* -Wmissing-prototypes */
1459 _initialize_solib (void)
1461 solib_data
= gdbarch_data_register_pre_init (solib_init
);
1463 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1464 _("Load shared object library symbols for files matching REGEXP."));
1465 add_info ("sharedlibrary", info_sharedlibrary_command
,
1466 _("Status of loaded shared object libraries."));
1467 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1468 _("Unload all shared object library symbols."));
1470 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1471 &auto_solib_add
, _("\
1472 Set autoloading of shared library symbols."), _("\
1473 Show autoloading of shared library symbols."), _("\
1474 If \"on\", symbols from all shared object libraries will be loaded\n\
1475 automatically when the inferior begins execution, when the dynamic linker\n\
1476 informs gdb that a new library has been loaded, or when attaching to the\n\
1477 inferior. Otherwise, symbols must be loaded manually, using \
1480 show_auto_solib_add
,
1481 &setlist
, &showlist
);
1483 add_setshow_filename_cmd ("sysroot", class_support
,
1485 Set an alternate system root."), _("\
1486 Show the current system root."), _("\
1487 The system root is used to load absolute shared library symbol files.\n\
1488 For other (relative) files, you can add directories using\n\
1489 `set solib-search-path'."),
1490 reload_shared_libraries
,
1492 &setlist
, &showlist
);
1494 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1496 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1499 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1500 &solib_search_path
, _("\
1501 Set the search path for loading non-absolute shared library symbol files."),
1503 Show the search path for loading non-absolute shared library symbol files."),
1505 This takes precedence over the environment variables \
1506 PATH and LD_LIBRARY_PATH."),
1507 reload_shared_libraries
,
1508 show_solib_search_path
,
1509 &setlist
, &showlist
);