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
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 /* Architecture-specific operations. */
52 /* Per-architecture data key. */
53 static struct gdbarch_data
*solib_data
;
56 solib_init (struct obstack
*obstack
)
58 struct target_so_ops
**ops
;
60 ops
= OBSTACK_ZALLOC (obstack
, struct target_so_ops
*);
61 *ops
= current_target_so_ops
;
65 static struct target_so_ops
*
66 solib_ops (struct gdbarch
*gdbarch
)
68 struct target_so_ops
**ops
= gdbarch_data (gdbarch
, solib_data
);
72 /* Set the solib operations for GDBARCH to NEW_OPS. */
75 set_solib_ops (struct gdbarch
*gdbarch
, struct target_so_ops
*new_ops
)
77 struct target_so_ops
**ops
= gdbarch_data (gdbarch
, solib_data
);
82 /* external data declarations */
84 /* FIXME: gdbarch needs to control this variable, or else every
85 configuration needs to call set_solib_ops. */
86 struct target_so_ops
*current_target_so_ops
;
88 /* local data declarations */
90 static struct so_list
*so_list_head
; /* List of known shared objects */
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
;
154 gdb_sysroot_is_empty
= (gdb_sysroot
== NULL
|| *gdb_sysroot
== 0);
156 if (! IS_ABSOLUTE_PATH (in_pathname
) || gdb_sysroot_is_empty
)
157 temp_pathname
= in_pathname
;
160 int prefix_len
= strlen (gdb_sysroot
);
162 /* Remove trailing slashes from absolute prefix. */
163 while (prefix_len
> 0
164 && IS_DIR_SEPARATOR (gdb_sysroot
[prefix_len
- 1]))
167 /* Cat the prefixed pathname together. */
168 temp_pathname
= alloca (prefix_len
+ strlen (in_pathname
) + 1);
169 strncpy (temp_pathname
, gdb_sysroot
, prefix_len
);
170 temp_pathname
[prefix_len
] = '\0';
171 strcat (temp_pathname
, in_pathname
);
174 /* Handle remote files. */
175 if (remote_filename_p (temp_pathname
))
178 return xstrdup (temp_pathname
);
181 /* Now see if we can open it. */
182 found_file
= open (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
184 /* We try to find the library in various ways. After each attempt
185 (except for the one above), either found_file >= 0 and
186 temp_pathname is a malloc'd string, or found_file < 0 and
187 temp_pathname does not point to storage that needs to be
191 temp_pathname
= NULL
;
193 temp_pathname
= xstrdup (temp_pathname
);
195 /* If the search in gdb_sysroot failed, and the path name is
196 absolute at this point, make it relative. (openp will try and open the
197 file according to its absolute path otherwise, which is not what we want.)
198 Affects subsequent searches for this solib. */
199 if (found_file
< 0 && IS_ABSOLUTE_PATH (in_pathname
))
201 /* First, get rid of any drive letters etc. */
202 while (!IS_DIR_SEPARATOR (*in_pathname
))
205 /* Next, get rid of all leading dir separators. */
206 while (IS_DIR_SEPARATOR (*in_pathname
))
210 /* If not found, search the solib_search_path (if any). */
211 if (found_file
< 0 && solib_search_path
!= NULL
)
212 found_file
= openp (solib_search_path
, OPF_TRY_CWD_FIRST
,
213 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
215 /* If not found, next search the solib_search_path (if any) for the basename
216 only (ignoring the path). This is to allow reading solibs from a path
217 that differs from the opened path. */
218 if (found_file
< 0 && solib_search_path
!= NULL
)
219 found_file
= openp (solib_search_path
, OPF_TRY_CWD_FIRST
,
220 lbasename (in_pathname
), O_RDONLY
| O_BINARY
,
223 /* If not found, try to use target supplied solib search method */
224 if (found_file
< 0 && ops
->find_and_open_solib
)
225 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
228 /* If not found, next search the inferior's $PATH environment variable. */
229 if (found_file
< 0 && gdb_sysroot_is_empty
)
230 found_file
= openp (get_in_environ (inferior_environ
, "PATH"),
231 OPF_TRY_CWD_FIRST
, in_pathname
, O_RDONLY
| O_BINARY
,
234 /* If not found, next search the inferior's $LD_LIBRARY_PATH
235 environment variable. */
236 if (found_file
< 0 && gdb_sysroot_is_empty
)
237 found_file
= openp (get_in_environ (inferior_environ
, "LD_LIBRARY_PATH"),
238 OPF_TRY_CWD_FIRST
, in_pathname
, O_RDONLY
| O_BINARY
,
242 return temp_pathname
;
245 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
246 it is used as file handle to open the file. Throws an error if the file
247 could not be opened. Handles both local and remote file access.
249 PATHNAME must be malloc'ed by the caller. If successful, the new BFD's
250 name will point to it. If unsuccessful, PATHNAME will be freed and the
251 FD will be closed (unless FD was -1). */
254 solib_bfd_fopen (char *pathname
, int fd
)
258 if (remote_filename_p (pathname
))
260 gdb_assert (fd
== -1);
261 abfd
= remote_bfd_open (pathname
, gnutarget
);
265 abfd
= bfd_fopen (pathname
, gnutarget
, FOPEN_RB
, fd
);
268 bfd_set_cacheable (abfd
, 1);
275 make_cleanup (xfree
, pathname
);
276 error (_("Could not open `%s' as an executable file: %s"),
277 pathname
, bfd_errmsg (bfd_get_error ()));
283 /* Find shared library PATHNAME and open a BFD for it. */
286 solib_bfd_open (char *pathname
)
288 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
289 char *found_pathname
;
292 const struct bfd_arch_info
*b
;
294 /* Use target-specific override if present. */
296 return ops
->bfd_open (pathname
);
298 /* Search for shared library file. */
299 found_pathname
= solib_find (pathname
, &found_file
);
300 if (found_pathname
== NULL
)
301 perror_with_name (pathname
);
303 /* Open bfd for shared library. */
304 abfd
= solib_bfd_fopen (found_pathname
, found_file
);
306 /* Check bfd format. */
307 if (!bfd_check_format (abfd
, bfd_object
))
310 make_cleanup (xfree
, found_pathname
);
311 error (_("`%s': not in executable format: %s"),
312 found_pathname
, bfd_errmsg (bfd_get_error ()));
315 /* Check bfd arch. */
316 b
= gdbarch_bfd_arch_info (target_gdbarch
);
317 if (b
->compatible (b
, bfd_get_arch_info (abfd
)) != b
)
318 warning (_("`%s': Shared library architecture %s is not compatible "
319 "with target architecture %s."), found_pathname
,
320 bfd_get_arch_info (abfd
)->printable_name
, b
->printable_name
);
330 solib_map_sections -- open bfd and build sections for shared lib
334 static int solib_map_sections (struct so_list *so)
338 Given a pointer to one of the shared objects in our list
339 of mapped objects, use the recorded name to open a bfd
340 descriptor for the object, build a section table, and then
341 relocate all the section addresses by the base address at
342 which the shared object was mapped.
346 In most (all?) cases the shared object file name recorded in the
347 dynamic linkage tables will be a fully qualified pathname. For
348 cases where it isn't, do we really mimic the systems search
349 mechanism correctly in the below code (particularly the tilde
354 solib_map_sections (void *arg
)
356 struct so_list
*so
= (struct so_list
*) arg
; /* catch_errors bogon */
358 struct target_section
*p
;
359 struct cleanup
*old_chain
;
362 filename
= tilde_expand (so
->so_name
);
363 old_chain
= make_cleanup (xfree
, filename
);
364 abfd
= solib_bfd_open (filename
);
365 do_cleanups (old_chain
);
367 /* Leave bfd open, core_xfer_memory and "info files" need it. */
370 /* copy full path name into so_name, so that later symbol_file_add
372 if (strlen (bfd_get_filename (abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
373 error (_("Shared library file name is too long."));
374 strcpy (so
->so_name
, bfd_get_filename (abfd
));
376 if (build_section_table (abfd
, &so
->sections
, &so
->sections_end
))
378 error (_("Can't find the file sections in `%s': %s"),
379 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
382 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
384 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
386 /* Relocate the section binding addresses as recorded in the shared
387 object's file by the base address to which the object was actually
389 ops
->relocate_section_addresses (so
, p
);
391 /* If the target didn't provide information about the address
392 range of the shared object, assume we want the location of
393 the .text section. */
394 if (so
->addr_low
== 0 && so
->addr_high
== 0
395 && strcmp (p
->the_bfd_section
->name
, ".text") == 0)
397 so
->addr_low
= p
->addr
;
398 so
->addr_high
= p
->endaddr
;
407 free_so --- free a `struct so_list' object
411 void free_so (struct so_list *so)
415 Free the storage associated with the `struct so_list' object SO.
416 If we have opened a BFD for SO, close it.
418 The caller is responsible for removing SO from whatever list it is
419 a member of. If we have placed SO's sections in some target's
420 section table, the caller is responsible for removing them.
422 This function doesn't mess with objfiles at all. If there is an
423 objfile associated with SO that needs to be removed, the caller is
424 responsible for taking care of that. */
427 free_so (struct so_list
*so
)
429 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
430 char *bfd_filename
= 0;
433 xfree (so
->sections
);
437 bfd_filename
= bfd_get_filename (so
->abfd
);
438 if (! bfd_close (so
->abfd
))
439 warning (_("cannot close \"%s\": %s"),
440 bfd_filename
, bfd_errmsg (bfd_get_error ()));
444 xfree (bfd_filename
);
452 /* Return address of first so_list entry in master shared object list. */
454 master_so_list (void)
460 symbol_add_stub (struct so_list
*so
, int flags
)
462 struct section_addr_info
*sap
;
464 /* Have we already loaded this shared object? */
465 ALL_OBJFILES (so
->objfile
)
467 if (strcmp (so
->objfile
->name
, so
->so_name
) == 0)
471 sap
= build_section_addr_info_from_section_table (so
->sections
,
474 so
->objfile
= symbol_file_add_from_bfd (so
->abfd
, flags
,
475 sap
, OBJF_SHARED
| OBJF_KEEPBFD
);
476 free_section_addr_info (sap
);
481 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
482 be chatty about it. Return non-zero if any symbols were actually
486 solib_read_symbols (struct so_list
*so
, int flags
)
488 const int from_tty
= flags
& SYMFILE_VERBOSE
;
490 if (so
->symbols_loaded
)
493 printf_unfiltered (_("Symbols already loaded for %s\n"), so
->so_name
);
495 else if (so
->abfd
== NULL
)
498 printf_unfiltered (_("Symbol file not found for %s\n"), so
->so_name
);
502 volatile struct gdb_exception exception
;
503 TRY_CATCH (exception
, RETURN_MASK_ALL
)
505 symbol_add_stub (so
, flags
);
507 if (exception
.reason
!= 0)
509 exception_fprintf (gdb_stderr
, exception
,
510 "Error while reading shared library symbols:\n");
513 if (from_tty
&& print_symbol_loading
)
514 printf_unfiltered (_("Loaded symbols for %s\n"), so
->so_name
);
515 so
->symbols_loaded
= 1;
524 update_solib_list --- synchronize GDB's shared object list with inferior's
528 void update_solib_list (int from_tty, struct target_ops *TARGET)
530 Extract the list of currently loaded shared objects from the
531 inferior, and compare it with the list of shared objects currently
532 in GDB's so_list_head list. Edit so_list_head to bring it in sync
533 with the inferior's new list.
535 If we notice that the inferior has unloaded some shared objects,
536 free any symbolic info GDB had read about those shared objects.
538 Don't load symbolic info for any new shared objects; just add them
539 to the list, and leave their symbols_loaded flag clear.
541 If FROM_TTY is non-null, feel free to print messages about what
544 If TARGET is non-null, add the sections of all new shared objects
545 to TARGET's section table. Note that this doesn't remove any
546 sections for shared objects that have been unloaded, and it
547 doesn't check to see if the new shared objects are already present in
548 the section table. But we only use this for core files and
549 processes we've just attached to, so that's okay. */
552 update_solib_list (int from_tty
, struct target_ops
*target
)
554 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
555 struct so_list
*inferior
= ops
->current_sos();
556 struct so_list
*gdb
, **gdb_link
;
558 /* We can reach here due to changing solib-search-path or the
559 sysroot, before having any inferior. */
560 if (target_has_execution
&& !ptid_equal (inferior_ptid
, null_ptid
))
562 struct inferior
*inf
= current_inferior ();
564 /* If we are attaching to a running process for which we
565 have not opened a symbol file, we may be able to get its
567 if (inf
->attach_flag
&& symfile_objfile
== NULL
)
568 catch_errors (ops
->open_symbol_file_object
, &from_tty
,
569 "Error reading attached process's symbol file.\n",
573 /* GDB and the inferior's dynamic linker each maintain their own
574 list of currently loaded shared objects; we want to bring the
575 former in sync with the latter. Scan both lists, seeing which
576 shared objects appear where. There are three cases:
578 - A shared object appears on both lists. This means that GDB
579 knows about it already, and it's still loaded in the inferior.
580 Nothing needs to happen.
582 - A shared object appears only on GDB's list. This means that
583 the inferior has unloaded it. We should remove the shared
584 object from GDB's tables.
586 - A shared object appears only on the inferior's list. This
587 means that it's just been loaded. We should add it to GDB's
590 So we walk GDB's list, checking each entry to see if it appears
591 in the inferior's list too. If it does, no action is needed, and
592 we remove it from the inferior's list. If it doesn't, the
593 inferior has unloaded it, and we remove it from GDB's list. By
594 the time we're done walking GDB's list, the inferior's list
595 contains only the new shared objects, which we then add. */
598 gdb_link
= &so_list_head
;
601 struct so_list
*i
= inferior
;
602 struct so_list
**i_link
= &inferior
;
604 /* Check to see whether the shared object *gdb also appears in
605 the inferior's current list. */
610 if (ops
->same (gdb
, i
))
615 if (! strcmp (gdb
->so_original_name
, i
->so_original_name
))
623 /* If the shared object appears on the inferior's list too, then
624 it's still loaded, so we don't need to do anything. Delete
625 it from the inferior's list, and leave it on GDB's list. */
630 gdb_link
= &gdb
->next
;
634 /* If it's not on the inferior's list, remove it from GDB's tables. */
637 /* Notify any observer that the shared object has been
638 unloaded before we remove it from GDB's tables. */
639 observer_notify_solib_unloaded (gdb
);
641 *gdb_link
= gdb
->next
;
643 /* Unless the user loaded it explicitly, free SO's objfile. */
644 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
))
645 free_objfile (gdb
->objfile
);
647 /* Some targets' section tables might be referring to
648 sections from so->abfd; remove them. */
649 remove_target_sections (gdb
->abfd
);
656 /* Now the inferior's list contains only shared objects that don't
657 appear in GDB's list --- those that are newly loaded. Add them
658 to GDB's shared object list. */
663 /* Add the new shared objects to GDB's list. */
664 *gdb_link
= inferior
;
666 /* Fill in the rest of each of the `struct so_list' nodes. */
667 for (i
= inferior
; i
; i
= i
->next
)
669 i
->from_tty
= from_tty
;
671 /* Fill in the rest of the `struct so_list' node. */
672 catch_errors (solib_map_sections
, i
,
673 "Error while mapping shared library sections:\n",
676 /* Add the shared object's sections to the current set of
677 file section tables. Do this immediately after mapping
678 the object so that later nodes in the list can query this
679 object, as is needed in solib-osf.c. */
680 add_target_sections (i
->sections
, i
->sections_end
);
682 /* Notify any observer that the shared object has been
683 loaded now that we've added it to GDB's tables. */
684 observer_notify_solib_loaded (i
);
690 /* Return non-zero if NAME is the libpthread shared library.
692 Uses a fairly simplistic heuristic approach where we check
693 the file name against "/libpthread". This can lead to false
694 positives, but this should be good enough in practice. */
697 libpthread_name_p (const char *name
)
699 return (strstr (name
, "/libpthread") != NULL
);
702 /* Return non-zero if SO is the libpthread shared library. */
705 libpthread_solib_p (struct so_list
*so
)
707 return libpthread_name_p (so
->so_name
);
712 solib_add -- read in symbol info for newly added shared libraries
716 void solib_add (char *pattern, int from_tty, struct target_ops
717 *TARGET, int readsyms)
721 Read in symbolic information for any shared objects whose names
722 match PATTERN. (If we've already read a shared object's symbol
723 info, leave it alone.) If PATTERN is zero, read them all.
725 If READSYMS is 0, defer reading symbolic information until later
726 but still do any needed low level processing.
728 FROM_TTY and TARGET are as described for update_solib_list, above. */
731 solib_add (char *pattern
, int from_tty
, struct target_ops
*target
, int readsyms
)
737 char *re_err
= re_comp (pattern
);
740 error (_("Invalid regexp: %s"), re_err
);
743 update_solib_list (from_tty
, target
);
745 /* Walk the list of currently loaded shared libraries, and read
746 symbols for any that match the pattern --- or any whose symbols
747 aren't already loaded, if no pattern was given. */
750 int loaded_any_symbols
= 0;
752 SYMFILE_DEFER_BP_RESET
| (from_tty
? SYMFILE_VERBOSE
: 0);
754 for (gdb
= so_list_head
; gdb
; gdb
= gdb
->next
)
755 if (! pattern
|| re_exec (gdb
->so_name
))
757 /* Normally, we would read the symbols from that library
758 only if READSYMS is set. However, we're making a small
759 exception for the pthread library, because we sometimes
760 need the library symbols to be loaded in order to provide
761 thread support (x86-linux for instance). */
762 const int add_this_solib
=
763 (readsyms
|| libpthread_solib_p (gdb
));
766 if (add_this_solib
&& solib_read_symbols (gdb
, flags
))
767 loaded_any_symbols
= 1;
770 if (loaded_any_symbols
)
771 breakpoint_re_set ();
773 if (from_tty
&& pattern
&& ! any_matches
)
775 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
777 if (loaded_any_symbols
)
779 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
781 /* Getting new symbols may change our opinion about what is
783 reinit_frame_cache ();
785 ops
->special_symbol_handling ();
795 info_sharedlibrary_command -- code for "info sharedlibrary"
799 static void info_sharedlibrary_command ()
803 Walk through the shared library list and print information
804 about each attached library.
808 info_sharedlibrary_command (char *ignore
, int from_tty
)
810 struct so_list
*so
= NULL
; /* link map state variable */
814 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
815 addr_width
= 4 + (gdbarch_ptr_bit (target_gdbarch
) / 4);
817 update_solib_list (from_tty
, 0);
819 for (so
= so_list_head
; so
; so
= so
->next
)
825 printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width
, "From",
826 addr_width
, "To", "Syms Read",
827 "Shared Object Library");
831 printf_unfiltered ("%-*s", addr_width
,
833 ? hex_string_custom (
834 (LONGEST
) so
->addr_low
,
837 printf_unfiltered ("%-*s", addr_width
,
839 ? hex_string_custom (
840 (LONGEST
) so
->addr_high
,
843 printf_unfiltered ("%-12s", so
->symbols_loaded
? "Yes" : "No");
844 printf_unfiltered ("%s\n", so
->so_name
);
847 if (so_list_head
== NULL
)
849 printf_unfiltered (_("No shared libraries loaded at this time.\n"));
853 /* Return 1 if ADDRESS lies within SOLIB. */
856 solib_contains_address_p (const struct so_list
*const solib
,
859 struct target_section
*p
;
861 for (p
= solib
->sections
; p
< solib
->sections_end
; p
++)
862 if (p
->addr
<= address
&& address
< p
->endaddr
)
872 solib_name_from_address -- if an address is in a shared lib, return
877 char * solib_name_from_address (CORE_ADDR address)
881 Provides a hook for other gdb routines to discover whether or
882 not a particular address is within the mapped address space of
885 For example, this routine is called at one point to disable
886 breakpoints which are in shared libraries that are not currently
891 solib_name_from_address (CORE_ADDR address
)
893 struct so_list
*so
= 0; /* link map state variable */
895 for (so
= so_list_head
; so
; so
= so
->next
)
896 if (solib_contains_address_p (so
, address
))
897 return (so
->so_name
);
902 /* Called by free_all_symtabs */
907 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
909 /* This function is expected to handle ELF shared libraries. It is
910 also used on Solaris, which can run either ELF or a.out binaries
911 (for compatibility with SunOS 4), both of which can use shared
912 libraries. So we don't know whether we have an ELF executable or
913 an a.out executable until the user chooses an executable file.
915 ELF shared libraries don't get mapped into the address space
916 until after the program starts, so we'd better not try to insert
917 breakpoints in them immediately. We have to wait until the
918 dynamic linker has loaded them; we'll hit a bp_shlib_event
919 breakpoint (look for calls to create_solib_event_breakpoint) when
922 SunOS shared libraries seem to be different --- they're present
923 as soon as the process begins execution, so there's no need to
924 put off inserting breakpoints. There's also nowhere to put a
925 bp_shlib_event breakpoint, so if we put it off, we'll never get
928 So: disable breakpoints only if we're using ELF shared libs. */
930 && bfd_get_flavour (exec_bfd
) != bfd_target_aout_flavour
)
931 disable_breakpoints_in_shlibs ();
935 struct so_list
*so
= so_list_head
;
936 so_list_head
= so
->next
;
937 observer_notify_solib_unloaded (so
);
939 remove_target_sections (so
->abfd
);
948 solib_create_inferior_hook -- shared library startup support
952 void solib_create_inferior_hook ()
956 When gdb starts up the inferior, it nurses it along (through the
957 shell) until it is ready to execute it's first instruction. At this
958 point, this function gets called via expansion of the macro
959 SOLIB_CREATE_INFERIOR_HOOK. */
962 solib_create_inferior_hook (void)
964 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
965 ops
->solib_create_inferior_hook();
970 in_solib_dynsym_resolve_code -- check to see if an address is in
971 dynamic loader's dynamic symbol
976 int in_solib_dynsym_resolve_code (CORE_ADDR pc)
980 Determine if PC is in the dynamic linker's symbol resolution
981 code. Return 1 if so, 0 otherwise.
985 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
987 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
988 return ops
->in_dynsym_resolve_code (pc
);
995 sharedlibrary_command -- handle command to explicitly add library
999 static void sharedlibrary_command (char *args, int from_tty)
1006 sharedlibrary_command (char *args
, int from_tty
)
1009 solib_add (args
, from_tty
, (struct target_ops
*) 0, 1);
1014 no_shared_libraries -- handle command to explicitly discard symbols
1015 from shared libraries.
1019 Implements the command "nosharedlibrary", which discards symbols
1020 that have been auto-loaded from shared libraries. Symbols from
1021 shared libraries that were added by explicit request of the user
1022 are not discarded. Also called from remote.c. */
1025 no_shared_libraries (char *ignored
, int from_tty
)
1027 /* The order of the two routines below is important: clear_solib notifies
1028 the solib_unloaded observers, and some of these observers might need
1029 access to their associated objfiles. Therefore, we can not purge the
1030 solibs' objfiles before clear_solib has been called. */
1033 objfile_purge_solibs ();
1037 reload_shared_libraries (char *ignored
, int from_tty
,
1038 struct cmd_list_element
*e
)
1040 no_shared_libraries (NULL
, from_tty
);
1041 solib_add (NULL
, from_tty
, NULL
, auto_solib_add
);
1042 /* Creating inferior hooks here has two purposes. First, if we reload
1043 shared libraries then the address of solib breakpoint we've computed
1044 previously might be no longer valid. For example, if we forgot to set
1045 solib-absolute-prefix and are setting it right now, then the previous
1046 breakpoint address is plain wrong. Second, installing solib hooks
1047 also implicitly figures were ld.so is and loads symbols for it.
1048 Absent this call, if we've just connected to a target and set
1049 solib-absolute-prefix or solib-search-path, we'll lose all information
1051 if (target_has_execution
)
1053 #ifdef SOLIB_CREATE_INFERIOR_HOOK
1054 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
1056 solib_create_inferior_hook ();
1059 /* We have unloaded and then reloaded debug info for all shared libraries.
1060 However, frames may still reference them, for example a frame's
1061 unwinder might still point of DWARF FDE structures that are now freed.
1062 Reinit frame cache to avoid crashing. */
1063 reinit_frame_cache ();
1067 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1068 struct cmd_list_element
*c
, const char *value
)
1070 fprintf_filtered (file
, _("Autoloading of shared library symbols is %s.\n"),
1075 /* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call
1076 the library-specific handler if it is installed for the current target. */
1079 solib_global_lookup (const struct objfile
*objfile
,
1081 const char *linkage_name
,
1082 const domain_enum domain
)
1084 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
1086 if (ops
->lookup_lib_global_symbol
!= NULL
)
1087 return ops
->lookup_lib_global_symbol (objfile
, name
, linkage_name
, domain
);
1092 extern initialize_file_ftype _initialize_solib
; /* -Wmissing-prototypes */
1095 _initialize_solib (void)
1097 struct cmd_list_element
*c
;
1099 solib_data
= gdbarch_data_register_pre_init (solib_init
);
1101 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1102 _("Load shared object library symbols for files matching REGEXP."));
1103 add_info ("sharedlibrary", info_sharedlibrary_command
,
1104 _("Status of loaded shared object libraries."));
1105 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1106 _("Unload all shared object library symbols."));
1108 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1109 &auto_solib_add
, _("\
1110 Set autoloading of shared library symbols."), _("\
1111 Show autoloading of shared library symbols."), _("\
1112 If \"on\", symbols from all shared object libraries will be loaded\n\
1113 automatically when the inferior begins execution, when the dynamic linker\n\
1114 informs gdb that a new library has been loaded, or when attaching to the\n\
1115 inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'."),
1117 show_auto_solib_add
,
1118 &setlist
, &showlist
);
1120 add_setshow_filename_cmd ("sysroot", class_support
,
1122 Set an alternate system root."), _("\
1123 Show the current system root."), _("\
1124 The system root is used to load absolute shared library symbol files.\n\
1125 For other (relative) files, you can add directories using\n\
1126 `set solib-search-path'."),
1127 reload_shared_libraries
,
1129 &setlist
, &showlist
);
1131 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1133 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1136 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1137 &solib_search_path
, _("\
1138 Set the search path for loading non-absolute shared library symbol files."), _("\
1139 Show the search path for loading non-absolute shared library symbol files."), _("\
1140 This takes precedence over the environment variables PATH and LD_LIBRARY_PATH."),
1141 reload_shared_libraries
,
1142 show_solib_search_path
,
1143 &setlist
, &showlist
);