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 char *found_pathname
;
291 const struct bfd_arch_info
*b
;
293 /* Search for shared library file. */
294 found_pathname
= solib_find (pathname
, &found_file
);
295 if (found_pathname
== NULL
)
296 perror_with_name (pathname
);
298 /* Open bfd for shared library. */
299 abfd
= solib_bfd_fopen (found_pathname
, found_file
);
301 /* Check bfd format. */
302 if (!bfd_check_format (abfd
, bfd_object
))
305 make_cleanup (xfree
, found_pathname
);
306 error (_("`%s': not in executable format: %s"),
307 found_pathname
, bfd_errmsg (bfd_get_error ()));
310 /* Check bfd arch. */
311 b
= gdbarch_bfd_arch_info (target_gdbarch
);
312 if (b
->compatible (b
, bfd_get_arch_info (abfd
)) != b
)
313 warning (_("`%s': Shared library architecture %s is not compatible "
314 "with target architecture %s."), found_pathname
,
315 bfd_get_arch_info (abfd
)->printable_name
, b
->printable_name
);
325 solib_map_sections -- open bfd and build sections for shared lib
329 static int solib_map_sections (struct so_list *so)
333 Given a pointer to one of the shared objects in our list
334 of mapped objects, use the recorded name to open a bfd
335 descriptor for the object, build a section table, and then
336 relocate all the section addresses by the base address at
337 which the shared object was mapped.
341 In most (all?) cases the shared object file name recorded in the
342 dynamic linkage tables will be a fully qualified pathname. For
343 cases where it isn't, do we really mimic the systems search
344 mechanism correctly in the below code (particularly the tilde
349 solib_map_sections (void *arg
)
351 struct so_list
*so
= (struct so_list
*) arg
; /* catch_errors bogon */
352 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
354 struct target_section
*p
;
355 struct cleanup
*old_chain
;
358 filename
= tilde_expand (so
->so_name
);
359 old_chain
= make_cleanup (xfree
, filename
);
360 abfd
= ops
->bfd_open (filename
);
361 do_cleanups (old_chain
);
363 /* Leave bfd open, core_xfer_memory and "info files" need it. */
366 /* copy full path name into so_name, so that later symbol_file_add
368 if (strlen (bfd_get_filename (abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
369 error (_("Shared library file name is too long."));
370 strcpy (so
->so_name
, bfd_get_filename (abfd
));
372 if (build_section_table (abfd
, &so
->sections
, &so
->sections_end
))
374 error (_("Can't find the file sections in `%s': %s"),
375 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
378 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
380 /* Relocate the section binding addresses as recorded in the shared
381 object's file by the base address to which the object was actually
383 ops
->relocate_section_addresses (so
, p
);
385 /* If the target didn't provide information about the address
386 range of the shared object, assume we want the location of
387 the .text section. */
388 if (so
->addr_low
== 0 && so
->addr_high
== 0
389 && strcmp (p
->the_bfd_section
->name
, ".text") == 0)
391 so
->addr_low
= p
->addr
;
392 so
->addr_high
= p
->endaddr
;
401 free_so --- free a `struct so_list' object
405 void free_so (struct so_list *so)
409 Free the storage associated with the `struct so_list' object SO.
410 If we have opened a BFD for SO, close it.
412 The caller is responsible for removing SO from whatever list it is
413 a member of. If we have placed SO's sections in some target's
414 section table, the caller is responsible for removing them.
416 This function doesn't mess with objfiles at all. If there is an
417 objfile associated with SO that needs to be removed, the caller is
418 responsible for taking care of that. */
421 free_so (struct so_list
*so
)
423 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
424 char *bfd_filename
= 0;
427 xfree (so
->sections
);
431 bfd_filename
= bfd_get_filename (so
->abfd
);
432 if (! bfd_close (so
->abfd
))
433 warning (_("cannot close \"%s\": %s"),
434 bfd_filename
, bfd_errmsg (bfd_get_error ()));
438 xfree (bfd_filename
);
446 /* Return address of first so_list entry in master shared object list. */
448 master_so_list (void)
454 symbol_add_stub (struct so_list
*so
, int flags
)
456 struct section_addr_info
*sap
;
458 /* Have we already loaded this shared object? */
459 ALL_OBJFILES (so
->objfile
)
461 if (strcmp (so
->objfile
->name
, so
->so_name
) == 0)
465 sap
= build_section_addr_info_from_section_table (so
->sections
,
468 so
->objfile
= symbol_file_add_from_bfd (so
->abfd
, flags
,
469 sap
, OBJF_SHARED
| OBJF_KEEPBFD
);
470 free_section_addr_info (sap
);
475 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
476 be chatty about it. Return non-zero if any symbols were actually
480 solib_read_symbols (struct so_list
*so
, int flags
)
482 const int from_tty
= flags
& SYMFILE_VERBOSE
;
484 if (so
->symbols_loaded
)
487 printf_unfiltered (_("Symbols already loaded for %s\n"), so
->so_name
);
489 else if (so
->abfd
== NULL
)
492 printf_unfiltered (_("Symbol file not found for %s\n"), so
->so_name
);
496 volatile struct gdb_exception exception
;
497 TRY_CATCH (exception
, RETURN_MASK_ALL
)
499 symbol_add_stub (so
, flags
);
501 if (exception
.reason
!= 0)
503 exception_fprintf (gdb_stderr
, exception
,
504 "Error while reading shared library symbols:\n");
507 if (from_tty
&& print_symbol_loading
)
508 printf_unfiltered (_("Loaded symbols for %s\n"), so
->so_name
);
509 so
->symbols_loaded
= 1;
518 update_solib_list --- synchronize GDB's shared object list with inferior's
522 void update_solib_list (int from_tty, struct target_ops *TARGET)
524 Extract the list of currently loaded shared objects from the
525 inferior, and compare it with the list of shared objects currently
526 in GDB's so_list_head list. Edit so_list_head to bring it in sync
527 with the inferior's new list.
529 If we notice that the inferior has unloaded some shared objects,
530 free any symbolic info GDB had read about those shared objects.
532 Don't load symbolic info for any new shared objects; just add them
533 to the list, and leave their symbols_loaded flag clear.
535 If FROM_TTY is non-null, feel free to print messages about what
538 If TARGET is non-null, add the sections of all new shared objects
539 to TARGET's section table. Note that this doesn't remove any
540 sections for shared objects that have been unloaded, and it
541 doesn't check to see if the new shared objects are already present in
542 the section table. But we only use this for core files and
543 processes we've just attached to, so that's okay. */
546 update_solib_list (int from_tty
, struct target_ops
*target
)
548 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
549 struct so_list
*inferior
= ops
->current_sos();
550 struct so_list
*gdb
, **gdb_link
;
552 /* We can reach here due to changing solib-search-path or the
553 sysroot, before having any inferior. */
554 if (target_has_execution
&& !ptid_equal (inferior_ptid
, null_ptid
))
556 struct inferior
*inf
= current_inferior ();
558 /* If we are attaching to a running process for which we
559 have not opened a symbol file, we may be able to get its
561 if (inf
->attach_flag
&& symfile_objfile
== NULL
)
562 catch_errors (ops
->open_symbol_file_object
, &from_tty
,
563 "Error reading attached process's symbol file.\n",
567 /* GDB and the inferior's dynamic linker each maintain their own
568 list of currently loaded shared objects; we want to bring the
569 former in sync with the latter. Scan both lists, seeing which
570 shared objects appear where. There are three cases:
572 - A shared object appears on both lists. This means that GDB
573 knows about it already, and it's still loaded in the inferior.
574 Nothing needs to happen.
576 - A shared object appears only on GDB's list. This means that
577 the inferior has unloaded it. We should remove the shared
578 object from GDB's tables.
580 - A shared object appears only on the inferior's list. This
581 means that it's just been loaded. We should add it to GDB's
584 So we walk GDB's list, checking each entry to see if it appears
585 in the inferior's list too. If it does, no action is needed, and
586 we remove it from the inferior's list. If it doesn't, the
587 inferior has unloaded it, and we remove it from GDB's list. By
588 the time we're done walking GDB's list, the inferior's list
589 contains only the new shared objects, which we then add. */
592 gdb_link
= &so_list_head
;
595 struct so_list
*i
= inferior
;
596 struct so_list
**i_link
= &inferior
;
598 /* Check to see whether the shared object *gdb also appears in
599 the inferior's current list. */
604 if (ops
->same (gdb
, i
))
609 if (! strcmp (gdb
->so_original_name
, i
->so_original_name
))
617 /* If the shared object appears on the inferior's list too, then
618 it's still loaded, so we don't need to do anything. Delete
619 it from the inferior's list, and leave it on GDB's list. */
624 gdb_link
= &gdb
->next
;
628 /* If it's not on the inferior's list, remove it from GDB's tables. */
631 /* Notify any observer that the shared object has been
632 unloaded before we remove it from GDB's tables. */
633 observer_notify_solib_unloaded (gdb
);
635 *gdb_link
= gdb
->next
;
637 /* Unless the user loaded it explicitly, free SO's objfile. */
638 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
))
639 free_objfile (gdb
->objfile
);
641 /* Some targets' section tables might be referring to
642 sections from so->abfd; remove them. */
643 remove_target_sections (gdb
->abfd
);
650 /* Now the inferior's list contains only shared objects that don't
651 appear in GDB's list --- those that are newly loaded. Add them
652 to GDB's shared object list. */
657 /* Add the new shared objects to GDB's list. */
658 *gdb_link
= inferior
;
660 /* Fill in the rest of each of the `struct so_list' nodes. */
661 for (i
= inferior
; i
; i
= i
->next
)
663 i
->from_tty
= from_tty
;
665 /* Fill in the rest of the `struct so_list' node. */
666 catch_errors (solib_map_sections
, i
,
667 "Error while mapping shared library sections:\n",
670 /* Add the shared object's sections to the current set of
671 file section tables. Do this immediately after mapping
672 the object so that later nodes in the list can query this
673 object, as is needed in solib-osf.c. */
674 add_target_sections (i
->sections
, i
->sections_end
);
676 /* Notify any observer that the shared object has been
677 loaded now that we've added it to GDB's tables. */
678 observer_notify_solib_loaded (i
);
684 /* Return non-zero if NAME is the libpthread shared library.
686 Uses a fairly simplistic heuristic approach where we check
687 the file name against "/libpthread". This can lead to false
688 positives, but this should be good enough in practice. */
691 libpthread_name_p (const char *name
)
693 return (strstr (name
, "/libpthread") != NULL
);
696 /* Return non-zero if SO is the libpthread shared library. */
699 libpthread_solib_p (struct so_list
*so
)
701 return libpthread_name_p (so
->so_name
);
706 solib_add -- read in symbol info for newly added shared libraries
710 void solib_add (char *pattern, int from_tty, struct target_ops
711 *TARGET, int readsyms)
715 Read in symbolic information for any shared objects whose names
716 match PATTERN. (If we've already read a shared object's symbol
717 info, leave it alone.) If PATTERN is zero, read them all.
719 If READSYMS is 0, defer reading symbolic information until later
720 but still do any needed low level processing.
722 FROM_TTY and TARGET are as described for update_solib_list, above. */
725 solib_add (char *pattern
, int from_tty
, struct target_ops
*target
, int readsyms
)
731 char *re_err
= re_comp (pattern
);
734 error (_("Invalid regexp: %s"), re_err
);
737 update_solib_list (from_tty
, target
);
739 /* Walk the list of currently loaded shared libraries, and read
740 symbols for any that match the pattern --- or any whose symbols
741 aren't already loaded, if no pattern was given. */
744 int loaded_any_symbols
= 0;
746 SYMFILE_DEFER_BP_RESET
| (from_tty
? SYMFILE_VERBOSE
: 0);
748 for (gdb
= so_list_head
; gdb
; gdb
= gdb
->next
)
749 if (! pattern
|| re_exec (gdb
->so_name
))
751 /* Normally, we would read the symbols from that library
752 only if READSYMS is set. However, we're making a small
753 exception for the pthread library, because we sometimes
754 need the library symbols to be loaded in order to provide
755 thread support (x86-linux for instance). */
756 const int add_this_solib
=
757 (readsyms
|| libpthread_solib_p (gdb
));
760 if (add_this_solib
&& solib_read_symbols (gdb
, flags
))
761 loaded_any_symbols
= 1;
764 if (loaded_any_symbols
)
765 breakpoint_re_set ();
767 if (from_tty
&& pattern
&& ! any_matches
)
769 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
771 if (loaded_any_symbols
)
773 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
775 /* Getting new symbols may change our opinion about what is
777 reinit_frame_cache ();
779 ops
->special_symbol_handling ();
789 info_sharedlibrary_command -- code for "info sharedlibrary"
793 static void info_sharedlibrary_command ()
797 Walk through the shared library list and print information
798 about each attached library.
802 info_sharedlibrary_command (char *ignore
, int from_tty
)
804 struct so_list
*so
= NULL
; /* link map state variable */
808 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
809 addr_width
= 4 + (gdbarch_ptr_bit (target_gdbarch
) / 4);
811 update_solib_list (from_tty
, 0);
813 for (so
= so_list_head
; so
; so
= so
->next
)
819 printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width
, "From",
820 addr_width
, "To", "Syms Read",
821 "Shared Object Library");
825 printf_unfiltered ("%-*s", addr_width
,
827 ? hex_string_custom (
828 (LONGEST
) so
->addr_low
,
831 printf_unfiltered ("%-*s", addr_width
,
833 ? hex_string_custom (
834 (LONGEST
) so
->addr_high
,
837 printf_unfiltered ("%-12s", so
->symbols_loaded
? "Yes" : "No");
838 printf_unfiltered ("%s\n", so
->so_name
);
841 if (so_list_head
== NULL
)
843 printf_unfiltered (_("No shared libraries loaded at this time.\n"));
847 /* Return 1 if ADDRESS lies within SOLIB. */
850 solib_contains_address_p (const struct so_list
*const solib
,
853 struct target_section
*p
;
855 for (p
= solib
->sections
; p
< solib
->sections_end
; p
++)
856 if (p
->addr
<= address
&& address
< p
->endaddr
)
866 solib_name_from_address -- if an address is in a shared lib, return
871 char * solib_name_from_address (CORE_ADDR address)
875 Provides a hook for other gdb routines to discover whether or
876 not a particular address is within the mapped address space of
879 For example, this routine is called at one point to disable
880 breakpoints which are in shared libraries that are not currently
885 solib_name_from_address (CORE_ADDR address
)
887 struct so_list
*so
= 0; /* link map state variable */
889 for (so
= so_list_head
; so
; so
= so
->next
)
890 if (solib_contains_address_p (so
, address
))
891 return (so
->so_name
);
896 /* Called by free_all_symtabs */
901 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
903 /* This function is expected to handle ELF shared libraries. It is
904 also used on Solaris, which can run either ELF or a.out binaries
905 (for compatibility with SunOS 4), both of which can use shared
906 libraries. So we don't know whether we have an ELF executable or
907 an a.out executable until the user chooses an executable file.
909 ELF shared libraries don't get mapped into the address space
910 until after the program starts, so we'd better not try to insert
911 breakpoints in them immediately. We have to wait until the
912 dynamic linker has loaded them; we'll hit a bp_shlib_event
913 breakpoint (look for calls to create_solib_event_breakpoint) when
916 SunOS shared libraries seem to be different --- they're present
917 as soon as the process begins execution, so there's no need to
918 put off inserting breakpoints. There's also nowhere to put a
919 bp_shlib_event breakpoint, so if we put it off, we'll never get
922 So: disable breakpoints only if we're using ELF shared libs. */
924 && bfd_get_flavour (exec_bfd
) != bfd_target_aout_flavour
)
925 disable_breakpoints_in_shlibs ();
929 struct so_list
*so
= so_list_head
;
930 so_list_head
= so
->next
;
931 observer_notify_solib_unloaded (so
);
933 remove_target_sections (so
->abfd
);
942 solib_create_inferior_hook -- shared library startup support
946 void solib_create_inferior_hook ()
950 When gdb starts up the inferior, it nurses it along (through the
951 shell) until it is ready to execute it's first instruction. At this
952 point, this function gets called via expansion of the macro
953 SOLIB_CREATE_INFERIOR_HOOK. */
956 solib_create_inferior_hook (void)
958 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
959 ops
->solib_create_inferior_hook();
964 in_solib_dynsym_resolve_code -- check to see if an address is in
965 dynamic loader's dynamic symbol
970 int in_solib_dynsym_resolve_code (CORE_ADDR pc)
974 Determine if PC is in the dynamic linker's symbol resolution
975 code. Return 1 if so, 0 otherwise.
979 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
981 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
982 return ops
->in_dynsym_resolve_code (pc
);
989 sharedlibrary_command -- handle command to explicitly add library
993 static void sharedlibrary_command (char *args, int from_tty)
1000 sharedlibrary_command (char *args
, int from_tty
)
1003 solib_add (args
, from_tty
, (struct target_ops
*) 0, 1);
1008 no_shared_libraries -- handle command to explicitly discard symbols
1009 from shared libraries.
1013 Implements the command "nosharedlibrary", which discards symbols
1014 that have been auto-loaded from shared libraries. Symbols from
1015 shared libraries that were added by explicit request of the user
1016 are not discarded. Also called from remote.c. */
1019 no_shared_libraries (char *ignored
, int from_tty
)
1021 /* The order of the two routines below is important: clear_solib notifies
1022 the solib_unloaded observers, and some of these observers might need
1023 access to their associated objfiles. Therefore, we can not purge the
1024 solibs' objfiles before clear_solib has been called. */
1027 objfile_purge_solibs ();
1031 reload_shared_libraries (char *ignored
, int from_tty
,
1032 struct cmd_list_element
*e
)
1034 no_shared_libraries (NULL
, from_tty
);
1035 solib_add (NULL
, from_tty
, NULL
, auto_solib_add
);
1036 /* Creating inferior hooks here has two purposes. First, if we reload
1037 shared libraries then the address of solib breakpoint we've computed
1038 previously might be no longer valid. For example, if we forgot to set
1039 solib-absolute-prefix and are setting it right now, then the previous
1040 breakpoint address is plain wrong. Second, installing solib hooks
1041 also implicitly figures were ld.so is and loads symbols for it.
1042 Absent this call, if we've just connected to a target and set
1043 solib-absolute-prefix or solib-search-path, we'll lose all information
1045 if (target_has_execution
)
1047 #ifdef SOLIB_CREATE_INFERIOR_HOOK
1048 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
1050 solib_create_inferior_hook ();
1053 /* We have unloaded and then reloaded debug info for all shared libraries.
1054 However, frames may still reference them, for example a frame's
1055 unwinder might still point of DWARF FDE structures that are now freed.
1056 Reinit frame cache to avoid crashing. */
1057 reinit_frame_cache ();
1061 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1062 struct cmd_list_element
*c
, const char *value
)
1064 fprintf_filtered (file
, _("Autoloading of shared library symbols is %s.\n"),
1069 /* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call
1070 the library-specific handler if it is installed for the current target. */
1073 solib_global_lookup (const struct objfile
*objfile
,
1075 const char *linkage_name
,
1076 const domain_enum domain
)
1078 struct target_so_ops
*ops
= solib_ops (target_gdbarch
);
1080 if (ops
->lookup_lib_global_symbol
!= NULL
)
1081 return ops
->lookup_lib_global_symbol (objfile
, name
, linkage_name
, domain
);
1086 extern initialize_file_ftype _initialize_solib
; /* -Wmissing-prototypes */
1089 _initialize_solib (void)
1091 struct cmd_list_element
*c
;
1093 solib_data
= gdbarch_data_register_pre_init (solib_init
);
1095 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1096 _("Load shared object library symbols for files matching REGEXP."));
1097 add_info ("sharedlibrary", info_sharedlibrary_command
,
1098 _("Status of loaded shared object libraries."));
1099 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1100 _("Unload all shared object library symbols."));
1102 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1103 &auto_solib_add
, _("\
1104 Set autoloading of shared library symbols."), _("\
1105 Show autoloading of shared library symbols."), _("\
1106 If \"on\", symbols from all shared object libraries will be loaded\n\
1107 automatically when the inferior begins execution, when the dynamic linker\n\
1108 informs gdb that a new library has been loaded, or when attaching to the\n\
1109 inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'."),
1111 show_auto_solib_add
,
1112 &setlist
, &showlist
);
1114 add_setshow_filename_cmd ("sysroot", class_support
,
1116 Set an alternate system root."), _("\
1117 Show the current system root."), _("\
1118 The system root is used to load absolute shared library symbol files.\n\
1119 For other (relative) files, you can add directories using\n\
1120 `set solib-search-path'."),
1121 reload_shared_libraries
,
1123 &setlist
, &showlist
);
1125 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1127 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1130 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1131 &solib_search_path
, _("\
1132 Set the search path for loading non-absolute shared library symbol files."), _("\
1133 Show the search path for loading non-absolute shared library symbol files."), _("\
1134 This takes precedence over the environment variables PATH and LD_LIBRARY_PATH."),
1135 reload_shared_libraries
,
1136 show_solib_search_path
,
1137 &setlist
, &showlist
);