1 /* Handle shared libraries for GDB, the GNU Debugger.
3 Copyright (C) 1990-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include <sys/types.h>
32 #include "gdb_regex.h"
37 #include "completer.h"
38 #include "filenames.h" /* for DOSish file names */
42 #include "readline/readline.h"
46 #include "filesystem.h"
48 #include "filestuff.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 const struct target_so_ops
*
66 solib_ops (struct gdbarch
*gdbarch
)
68 const struct target_so_ops
**ops
69 = (const struct target_so_ops
**) gdbarch_data (gdbarch
, solib_data
);
74 /* Set the solib operations for GDBARCH to NEW_OPS. */
77 set_solib_ops (struct gdbarch
*gdbarch
, const struct target_so_ops
*new_ops
)
79 const struct target_so_ops
**ops
80 = (const struct target_so_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 /* 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
, _("The search path for loading non-absolute "
103 "shared library symbol files is %s.\n"),
107 /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
108 #if (HAVE_DOS_BASED_FILE_SYSTEM)
109 # define DOS_BASED_FILE_SYSTEM 1
111 # define DOS_BASED_FILE_SYSTEM 0
114 /* Return the full pathname of a binary file (the main executable
115 or a shared library file), or NULL if not found. The returned
116 pathname is malloc'ed and must be freed by the caller. If FD
117 is non-NULL, *FD is set to either -1 or an open file handle for
120 Global variable GDB_SYSROOT is used as a prefix directory
121 to search for binary files if they have an absolute path.
122 If GDB_SYSROOT starts with "target:" and target filesystem
123 is the local filesystem then the "target:" prefix will be
124 stripped before the search starts. This ensures that the
125 same search algorithm is used for local files regardless of
126 whether a "target:" prefix was used.
128 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
129 (or set of directories, as in LD_LIBRARY_PATH) to search for all
130 shared libraries if not found in either the sysroot (if set) or
131 the local filesystem. SOLIB_SEARCH_PATH is not used when searching
132 for the main executable.
135 * If a sysroot is set and path is absolute:
136 * Search for sysroot/path.
138 * Look for it literally (unmodified).
139 * If IS_SOLIB is non-zero:
140 * Look in SOLIB_SEARCH_PATH.
141 * If available, use target defined search function.
142 * If NO sysroot is set, perform the following two searches:
143 * Look in inferior's $PATH.
144 * If IS_SOLIB is non-zero:
145 * Look in inferior's $LD_LIBRARY_PATH.
147 * The last check avoids doing this search when targetting remote
148 * machines since a sysroot will almost always be set.
152 solib_find_1 (const char *in_pathname
, int *fd
, int is_solib
)
154 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
156 char *temp_pathname
= NULL
;
157 const char *fskind
= effective_target_file_system_kind ();
158 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
159 char *sysroot
= gdb_sysroot
;
160 int prefix_len
, orig_prefix_len
;
162 /* If the absolute prefix starts with "target:" but the filesystem
163 accessed by the target_fileio_* methods is the local filesystem
164 then we strip the "target:" prefix now and work with the local
165 filesystem. This ensures that the same search algorithm is used
166 for all local files regardless of whether a "target:" prefix was
168 if (is_target_filename (sysroot
) && target_filesystem_is_local ())
169 sysroot
+= strlen (TARGET_SYSROOT_PREFIX
);
171 /* Strip any trailing slashes from the absolute prefix. */
172 prefix_len
= orig_prefix_len
= strlen (sysroot
);
174 while (prefix_len
> 0 && IS_DIR_SEPARATOR (sysroot
[prefix_len
- 1]))
179 else if (prefix_len
!= orig_prefix_len
)
181 sysroot
= savestring (sysroot
, prefix_len
);
182 make_cleanup (xfree
, sysroot
);
185 /* If we're on a non-DOS-based system, backslashes won't be
186 understood as directory separator, so, convert them to forward
187 slashes, iff we're supposed to handle DOS-based file system
188 semantics for target paths. */
189 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
193 /* Avoid clobbering our input. */
194 p
= (char *) alloca (strlen (in_pathname
) + 1);
195 strcpy (p
, in_pathname
);
205 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
206 IS_ABSOLUTE_PATH. The latter is for host paths only, while
207 IN_PATHNAME is a target path. For example, if we're supposed to
208 be handling DOS-like semantics we want to consider a
209 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
210 With such a path, before giving up on the sysroot, we'll try:
212 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
213 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
214 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
217 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || sysroot
== NULL
)
218 temp_pathname
= xstrdup (in_pathname
);
221 int need_dir_separator
;
223 /* Concatenate the sysroot and the target reported filename. We
224 may need to glue them with a directory separator. Cases to
227 | sysroot | separator | in_pathname |
228 |-----------------+-----------+----------------|
229 | /some/dir | / | c:/foo/bar.dll |
230 | /some/dir | | /foo/bar.dll |
231 | target: | | c:/foo/bar.dll |
232 | target: | | /foo/bar.dll |
233 | target:some/dir | / | c:/foo/bar.dll |
234 | target:some/dir | | /foo/bar.dll |
236 IOW, we don't need to add a separator if IN_PATHNAME already
237 has one, or when the the sysroot is exactly "target:".
238 There's no need to check for drive spec explicitly, as we only
239 get here if IN_PATHNAME is considered an absolute path. */
240 need_dir_separator
= !(IS_DIR_SEPARATOR (in_pathname
[0])
241 || strcmp (TARGET_SYSROOT_PREFIX
, sysroot
) == 0);
243 /* Cat the prefixed pathname together. */
244 temp_pathname
= concat (sysroot
,
245 need_dir_separator
? SLASH_STRING
: "",
246 in_pathname
, (char *) NULL
);
249 /* Handle files to be accessed via the target. */
250 if (is_target_filename (temp_pathname
))
254 do_cleanups (old_chain
);
255 return temp_pathname
;
258 /* Now see if we can open it. */
259 found_file
= gdb_open_cloexec (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
261 xfree (temp_pathname
);
263 /* If the search in gdb_sysroot failed, and the path name has a
264 drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
265 and retrying in the sysroot:
266 c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
270 && HAS_TARGET_DRIVE_SPEC (fskind
, in_pathname
))
272 int need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
273 char *drive
= savestring (in_pathname
, 1);
275 temp_pathname
= concat (sysroot
,
278 need_dir_separator
? SLASH_STRING
: "",
279 in_pathname
+ 2, (char *) NULL
);
282 found_file
= gdb_open_cloexec (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
285 xfree (temp_pathname
);
287 /* If the search in gdb_sysroot still failed, try fully
288 stripping the drive spec, and trying once more in the
289 sysroot before giving up.
291 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
293 temp_pathname
= concat (sysroot
,
294 need_dir_separator
? SLASH_STRING
: "",
295 in_pathname
+ 2, (char *) NULL
);
297 found_file
= gdb_open_cloexec (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
299 xfree (temp_pathname
);
303 do_cleanups (old_chain
);
305 /* We try to find the library in various ways. After each attempt,
306 either found_file >= 0 and temp_pathname is a malloc'd string, or
307 found_file < 0 and temp_pathname does not point to storage that
308 needs to be freed. */
311 temp_pathname
= NULL
;
313 /* If the search in gdb_sysroot failed, and the path name is
314 absolute at this point, make it relative. (openp will try and open the
315 file according to its absolute path otherwise, which is not what we want.)
316 Affects subsequent searches for this solib. */
317 if (found_file
< 0 && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
319 /* First, get rid of any drive letters etc. */
320 while (!IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
323 /* Next, get rid of all leading dir separators. */
324 while (IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
328 /* If not found, and we're looking for a solib, search the
329 solib_search_path (if any). */
330 if (is_solib
&& found_file
< 0 && solib_search_path
!= NULL
)
331 found_file
= openp (solib_search_path
,
332 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
333 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
335 /* If not found, and we're looking for a solib, next search the
336 solib_search_path (if any) for the basename only (ignoring the
337 path). This is to allow reading solibs from a path that differs
338 from the opened path. */
339 if (is_solib
&& found_file
< 0 && solib_search_path
!= NULL
)
340 found_file
= openp (solib_search_path
,
341 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
342 target_lbasename (fskind
, in_pathname
),
343 O_RDONLY
| O_BINARY
, &temp_pathname
);
345 /* If not found, and we're looking for a solib, try to use target
346 supplied solib search method. */
347 if (is_solib
&& found_file
< 0 && ops
->find_and_open_solib
)
348 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
351 /* If not found, next search the inferior's $PATH environment variable. */
352 if (found_file
< 0 && sysroot
== NULL
)
353 found_file
= openp (current_inferior ()->environment
.get ("PATH"),
354 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
355 O_RDONLY
| O_BINARY
, &temp_pathname
);
357 /* If not found, and we're looking for a solib, next search the
358 inferior's $LD_LIBRARY_PATH environment variable. */
359 if (is_solib
&& found_file
< 0 && sysroot
== NULL
)
360 found_file
= openp (current_inferior ()->environment
.get
362 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
363 O_RDONLY
| O_BINARY
, &temp_pathname
);
373 return temp_pathname
;
376 /* Return the full pathname of the main executable, or NULL if not
377 found. The returned pathname is malloc'ed and must be freed by
378 the caller. If FD is non-NULL, *FD is set to either -1 or an open
379 file handle for the main executable. */
382 exec_file_find (const char *in_pathname
, int *fd
)
385 const char *fskind
= effective_target_file_system_kind ();
387 if (in_pathname
== NULL
)
390 if (*gdb_sysroot
!= '\0' && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
392 result
= solib_find_1 (in_pathname
, fd
, 0);
394 if (result
== NULL
&& fskind
== file_system_kind_dos_based
)
398 new_pathname
= (char *) alloca (strlen (in_pathname
) + 5);
399 strcpy (new_pathname
, in_pathname
);
400 strcat (new_pathname
, ".exe");
402 result
= solib_find_1 (new_pathname
, fd
, 0);
407 /* It's possible we don't have a full path, but rather just a
408 filename. Some targets, such as HP-UX, don't provide the
411 Attempt to qualify the filename against the source path.
412 (If that fails, we'll just fall back on the original
413 filename. Not much more we can do...) */
415 if (!source_full_path_of (in_pathname
, &result
))
416 result
= xstrdup (in_pathname
);
424 /* Return the full pathname of a shared library file, or NULL if not
425 found. The returned pathname is malloc'ed and must be freed by
426 the caller. If FD is non-NULL, *FD is set to either -1 or an open
427 file handle for the shared library.
429 The search algorithm used is described in solib_find_1's comment
433 solib_find (const char *in_pathname
, int *fd
)
435 const char *solib_symbols_extension
436 = gdbarch_solib_symbols_extension (target_gdbarch ());
438 /* If solib_symbols_extension is set, replace the file's
440 if (solib_symbols_extension
!= NULL
)
442 const char *p
= in_pathname
+ strlen (in_pathname
);
444 while (p
> in_pathname
&& *p
!= '.')
452 = (char *) alloca (p
- in_pathname
+ 1
453 + strlen (solib_symbols_extension
) + 1);
454 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
455 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
456 solib_symbols_extension
);
458 in_pathname
= new_pathname
;
462 return solib_find_1 (in_pathname
, fd
, 1);
465 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
466 it is used as file handle to open the file. Throws an error if the file
467 could not be opened. Handles both local and remote file access.
469 PATHNAME must be malloc'ed by the caller. It will be freed by this
470 function. If unsuccessful, the FD will be closed (unless FD was
474 solib_bfd_fopen (char *pathname
, int fd
)
476 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (pathname
, gnutarget
, fd
));
478 if (abfd
!= NULL
&& !gdb_bfd_has_target_filename (abfd
.get ()))
479 bfd_set_cacheable (abfd
.get (), 1);
483 make_cleanup (xfree
, pathname
);
484 error (_("Could not open `%s' as an executable file: %s"),
485 pathname
, bfd_errmsg (bfd_get_error ()));
493 /* Find shared library PATHNAME and open a BFD for it. */
496 solib_bfd_open (char *pathname
)
498 char *found_pathname
;
500 const struct bfd_arch_info
*b
;
502 /* Search for shared library file. */
503 found_pathname
= solib_find (pathname
, &found_file
);
504 if (found_pathname
== NULL
)
506 /* Return failure if the file could not be found, so that we can
507 accumulate messages about missing libraries. */
511 perror_with_name (pathname
);
514 /* Open bfd for shared library. */
515 gdb_bfd_ref_ptr
abfd (solib_bfd_fopen (found_pathname
, found_file
));
517 /* Check bfd format. */
518 if (!bfd_check_format (abfd
.get (), bfd_object
))
519 error (_("`%s': not in executable format: %s"),
520 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
522 /* Check bfd arch. */
523 b
= gdbarch_bfd_arch_info (target_gdbarch ());
524 if (!b
->compatible (b
, bfd_get_arch_info (abfd
.get ())))
525 warning (_("`%s': Shared library architecture %s is not compatible "
526 "with target architecture %s."), bfd_get_filename (abfd
),
527 bfd_get_arch_info (abfd
.get ())->printable_name
,
533 /* Given a pointer to one of the shared objects in our list of mapped
534 objects, use the recorded name to open a bfd descriptor for the
535 object, build a section table, relocate all the section addresses
536 by the base address at which the shared object was mapped, and then
537 add the sections to the target's section table.
539 FIXME: In most (all?) cases the shared object file name recorded in
540 the dynamic linkage tables will be a fully qualified pathname. For
541 cases where it isn't, do we really mimic the systems search
542 mechanism correctly in the below code (particularly the tilde
543 expansion stuff?). */
546 solib_map_sections (struct so_list
*so
)
548 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
550 struct target_section
*p
;
551 struct cleanup
*old_chain
;
553 filename
= tilde_expand (so
->so_name
);
554 old_chain
= make_cleanup (xfree
, filename
);
555 gdb_bfd_ref_ptr
abfd (ops
->bfd_open (filename
));
556 do_cleanups (old_chain
);
561 /* Leave bfd open, core_xfer_memory and "info files" need it. */
562 so
->abfd
= abfd
.release ();
564 /* Copy the full path name into so_name, allowing symbol_file_add
565 to find it later. This also affects the =library-loaded GDB/MI
566 event, and in particular the part of that notification providing
567 the library's host-side path. If we let the target dictate
568 that objfile's path, and the target is different from the host,
569 GDB/MI will not provide the correct host-side path. */
570 if (strlen (bfd_get_filename (so
->abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
571 error (_("Shared library file name is too long."));
572 strcpy (so
->so_name
, bfd_get_filename (so
->abfd
));
574 if (build_section_table (so
->abfd
, &so
->sections
, &so
->sections_end
))
576 error (_("Can't find the file sections in `%s': %s"),
577 bfd_get_filename (so
->abfd
), bfd_errmsg (bfd_get_error ()));
580 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
582 /* Relocate the section binding addresses as recorded in the shared
583 object's file by the base address to which the object was actually
585 ops
->relocate_section_addresses (so
, p
);
587 /* If the target didn't provide information about the address
588 range of the shared object, assume we want the location of
589 the .text section. */
590 if (so
->addr_low
== 0 && so
->addr_high
== 0
591 && strcmp (p
->the_bfd_section
->name
, ".text") == 0)
593 so
->addr_low
= p
->addr
;
594 so
->addr_high
= p
->endaddr
;
598 /* Add the shared object's sections to the current set of file
599 section tables. Do this immediately after mapping the object so
600 that later nodes in the list can query this object, as is needed
602 add_target_sections (so
, so
->sections
, so
->sections_end
);
607 /* Free symbol-file related contents of SO and reset for possible reloading
608 of SO. If we have opened a BFD for SO, close it. If we have placed SO's
609 sections in some target's section table, the caller is responsible for
612 This function doesn't mess with objfiles at all. If there is an
613 objfile associated with SO that needs to be removed, the caller is
614 responsible for taking care of that. */
617 clear_so (struct so_list
*so
)
619 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
623 xfree (so
->sections
);
624 so
->sections
= so
->sections_end
= NULL
;
627 gdb_bfd_unref (so
->abfd
);
630 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
631 so
->symbols_loaded
= 0;
634 so
->addr_low
= so
->addr_high
= 0;
636 /* Restore the target-supplied file name. SO_NAME may be the path
637 of the symbol file. */
638 strcpy (so
->so_name
, so
->so_original_name
);
640 /* Do the same for target-specific data. */
641 if (ops
->clear_so
!= NULL
)
645 /* Free the storage associated with the `struct so_list' object SO.
646 If we have opened a BFD for SO, close it.
648 The caller is responsible for removing SO from whatever list it is
649 a member of. If we have placed SO's sections in some target's
650 section table, the caller is responsible for removing them.
652 This function doesn't mess with objfiles at all. If there is an
653 objfile associated with SO that needs to be removed, the caller is
654 responsible for taking care of that. */
657 free_so (struct so_list
*so
)
659 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
668 /* Return address of first so_list entry in master shared object list. */
670 master_so_list (void)
675 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
676 be chatty about it. Return non-zero if any symbols were actually
680 solib_read_symbols (struct so_list
*so
, symfile_add_flags flags
)
682 if (so
->symbols_loaded
)
684 /* If needed, we've already warned in our caller. */
686 else if (so
->abfd
== NULL
)
688 /* We've already warned about this library, when trying to open
694 flags
|= current_inferior ()->symfile_flags
;
698 struct section_addr_info
*sap
;
700 /* Have we already loaded this shared object? */
701 ALL_OBJFILES (so
->objfile
)
703 if (filename_cmp (objfile_name (so
->objfile
), so
->so_name
) == 0
704 && so
->objfile
->addr_low
== so
->addr_low
)
707 if (so
->objfile
== NULL
)
709 sap
= build_section_addr_info_from_section_table (so
->sections
,
711 so
->objfile
= symbol_file_add_from_bfd (so
->abfd
, so
->so_name
,
712 flags
, sap
, OBJF_SHARED
,
714 so
->objfile
->addr_low
= so
->addr_low
;
715 free_section_addr_info (sap
);
718 so
->symbols_loaded
= 1;
720 CATCH (e
, RETURN_MASK_ERROR
)
722 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
723 " library symbols for %s:\n"),
734 /* Return 1 if KNOWN->objfile is used by any other so_list object in the
735 SO_LIST_HEAD list. Return 0 otherwise. */
738 solib_used (const struct so_list
*const known
)
740 const struct so_list
*pivot
;
742 for (pivot
= so_list_head
; pivot
!= NULL
; pivot
= pivot
->next
)
743 if (pivot
!= known
&& pivot
->objfile
== known
->objfile
)
751 update_solib_list (int from_tty
)
753 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
754 struct so_list
*inferior
= ops
->current_sos();
755 struct so_list
*gdb
, **gdb_link
;
757 /* We can reach here due to changing solib-search-path or the
758 sysroot, before having any inferior. */
759 if (target_has_execution
&& !ptid_equal (inferior_ptid
, null_ptid
))
761 struct inferior
*inf
= current_inferior ();
763 /* If we are attaching to a running process for which we
764 have not opened a symbol file, we may be able to get its
766 if (inf
->attach_flag
&& symfile_objfile
== NULL
)
767 catch_errors (ops
->open_symbol_file_object
, &from_tty
,
768 "Error reading attached process's symbol file.\n",
772 /* GDB and the inferior's dynamic linker each maintain their own
773 list of currently loaded shared objects; we want to bring the
774 former in sync with the latter. Scan both lists, seeing which
775 shared objects appear where. There are three cases:
777 - A shared object appears on both lists. This means that GDB
778 knows about it already, and it's still loaded in the inferior.
779 Nothing needs to happen.
781 - A shared object appears only on GDB's list. This means that
782 the inferior has unloaded it. We should remove the shared
783 object from GDB's tables.
785 - A shared object appears only on the inferior's list. This
786 means that it's just been loaded. We should add it to GDB's
789 So we walk GDB's list, checking each entry to see if it appears
790 in the inferior's list too. If it does, no action is needed, and
791 we remove it from the inferior's list. If it doesn't, the
792 inferior has unloaded it, and we remove it from GDB's list. By
793 the time we're done walking GDB's list, the inferior's list
794 contains only the new shared objects, which we then add. */
797 gdb_link
= &so_list_head
;
800 struct so_list
*i
= inferior
;
801 struct so_list
**i_link
= &inferior
;
803 /* Check to see whether the shared object *gdb also appears in
804 the inferior's current list. */
809 if (ops
->same (gdb
, i
))
814 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
822 /* If the shared object appears on the inferior's list too, then
823 it's still loaded, so we don't need to do anything. Delete
824 it from the inferior's list, and leave it on GDB's list. */
829 gdb_link
= &gdb
->next
;
833 /* If it's not on the inferior's list, remove it from GDB's tables. */
836 /* Notify any observer that the shared object has been
837 unloaded before we remove it from GDB's tables. */
838 observer_notify_solib_unloaded (gdb
);
840 VEC_safe_push (char_ptr
, current_program_space
->deleted_solibs
,
841 xstrdup (gdb
->so_name
));
843 *gdb_link
= gdb
->next
;
845 /* Unless the user loaded it explicitly, free SO's objfile. */
846 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
)
847 && !solib_used (gdb
))
848 free_objfile (gdb
->objfile
);
850 /* Some targets' section tables might be referring to
851 sections from so->abfd; remove them. */
852 remove_target_sections (gdb
);
859 /* Now the inferior's list contains only shared objects that don't
860 appear in GDB's list --- those that are newly loaded. Add them
861 to GDB's shared object list. */
865 const char *not_found_filename
= NULL
;
869 /* Add the new shared objects to GDB's list. */
870 *gdb_link
= inferior
;
872 /* Fill in the rest of each of the `struct so_list' nodes. */
873 for (i
= inferior
; i
; i
= i
->next
)
876 i
->pspace
= current_program_space
;
877 VEC_safe_push (so_list_ptr
, current_program_space
->added_solibs
, i
);
881 /* Fill in the rest of the `struct so_list' node. */
882 if (!solib_map_sections (i
))
885 if (not_found_filename
== NULL
)
886 not_found_filename
= i
->so_original_name
;
890 CATCH (e
, RETURN_MASK_ERROR
)
892 exception_fprintf (gdb_stderr
, e
,
893 _("Error while mapping shared "
894 "library sections:\n"));
898 /* Notify any observer that the shared object has been
899 loaded now that we've added it to GDB's tables. */
900 observer_notify_solib_loaded (i
);
903 /* If a library was not found, issue an appropriate warning
904 message. We have to use a single call to warning in case the
905 front end does something special with warnings, e.g., pop up
906 a dialog box. It Would Be Nice if we could get a "warning: "
907 prefix on each line in the CLI front end, though - it doesn't
911 warning (_("Could not load shared library symbols for %s.\n"
912 "Do you need \"set solib-search-path\" "
913 "or \"set sysroot\"?"),
915 else if (not_found
> 1)
917 Could not load shared library symbols for %d libraries, e.g. %s.\n\
918 Use the \"info sharedlibrary\" command to see the complete listing.\n\
919 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
920 not_found
, not_found_filename
);
925 /* Return non-zero if NAME is the libpthread shared library.
927 Uses a fairly simplistic heuristic approach where we check
928 the file name against "/libpthread". This can lead to false
929 positives, but this should be good enough in practice. */
932 libpthread_name_p (const char *name
)
934 return (strstr (name
, "/libpthread") != NULL
);
937 /* Return non-zero if SO is the libpthread shared library. */
940 libpthread_solib_p (struct so_list
*so
)
942 return libpthread_name_p (so
->so_name
);
945 /* Read in symbolic information for any shared objects whose names
946 match PATTERN. (If we've already read a shared object's symbol
947 info, leave it alone.) If PATTERN is zero, read them all.
949 If READSYMS is 0, defer reading symbolic information until later
950 but still do any needed low level processing.
952 FROM_TTY is described for update_solib_list, above. */
955 solib_add (const char *pattern
, int from_tty
, int readsyms
)
959 if (print_symbol_loading_p (from_tty
, 0, 0))
963 printf_unfiltered (_("Loading symbols for shared libraries: %s\n"),
967 printf_unfiltered (_("Loading symbols for shared libraries.\n"));
970 current_program_space
->solib_add_generation
++;
974 char *re_err
= re_comp (pattern
);
977 error (_("Invalid regexp: %s"), re_err
);
980 update_solib_list (from_tty
);
982 /* Walk the list of currently loaded shared libraries, and read
983 symbols for any that match the pattern --- or any whose symbols
984 aren't already loaded, if no pattern was given. */
987 int loaded_any_symbols
= 0;
988 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
991 add_flags
|= SYMFILE_VERBOSE
;
993 for (gdb
= so_list_head
; gdb
; gdb
= gdb
->next
)
994 if (! pattern
|| re_exec (gdb
->so_name
))
996 /* Normally, we would read the symbols from that library
997 only if READSYMS is set. However, we're making a small
998 exception for the pthread library, because we sometimes
999 need the library symbols to be loaded in order to provide
1000 thread support (x86-linux for instance). */
1001 const int add_this_solib
=
1002 (readsyms
|| libpthread_solib_p (gdb
));
1007 if (gdb
->symbols_loaded
)
1009 /* If no pattern was given, be quiet for shared
1010 libraries we have already loaded. */
1011 if (pattern
&& (from_tty
|| info_verbose
))
1012 printf_unfiltered (_("Symbols already loaded for %s\n"),
1015 else if (solib_read_symbols (gdb
, add_flags
))
1016 loaded_any_symbols
= 1;
1020 if (loaded_any_symbols
)
1021 breakpoint_re_set ();
1023 if (from_tty
&& pattern
&& ! any_matches
)
1025 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
1027 if (loaded_any_symbols
)
1029 /* Getting new symbols may change our opinion about what is
1031 reinit_frame_cache ();
1036 /* Implement the "info sharedlibrary" command. Walk through the
1037 shared library list and print information about each attached
1038 library matching PATTERN. If PATTERN is elided, print them
1042 info_sharedlibrary_command (char *pattern
, int from_tty
)
1044 struct so_list
*so
= NULL
; /* link map state variable */
1045 int so_missing_debug_info
= 0;
1048 struct cleanup
*table_cleanup
;
1049 struct gdbarch
*gdbarch
= target_gdbarch ();
1050 struct ui_out
*uiout
= current_uiout
;
1054 char *re_err
= re_comp (pattern
);
1057 error (_("Invalid regexp: %s"), re_err
);
1060 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1061 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1063 update_solib_list (from_tty
);
1065 /* make_cleanup_ui_out_table_begin_end needs to know the number of
1066 rows, so we need to make two passes over the libs. */
1068 for (nr_libs
= 0, so
= so_list_head
; so
; so
= so
->next
)
1072 if (pattern
&& ! re_exec (so
->so_name
))
1079 make_cleanup_ui_out_table_begin_end (uiout
, 4, nr_libs
,
1080 "SharedLibraryTable");
1082 /* The "- 1" is because ui_out adds one space between columns. */
1083 uiout
->table_header (addr_width
- 1, ui_left
, "from", "From");
1084 uiout
->table_header (addr_width
- 1, ui_left
, "to", "To");
1085 uiout
->table_header (12 - 1, ui_left
, "syms-read", "Syms Read");
1086 uiout
->table_header (0, ui_noalign
, "name", "Shared Object Library");
1088 uiout
->table_body ();
1092 if (! so
->so_name
[0])
1094 if (pattern
&& ! re_exec (so
->so_name
))
1097 ui_out_emit_tuple
tuple_emitter (uiout
, "lib");
1099 if (so
->addr_high
!= 0)
1101 uiout
->field_core_addr ("from", gdbarch
, so
->addr_low
);
1102 uiout
->field_core_addr ("to", gdbarch
, so
->addr_high
);
1106 uiout
->field_skip ("from");
1107 uiout
->field_skip ("to");
1110 if (! interp_ui_out (top_level_interpreter ())->is_mi_like_p ()
1111 && so
->symbols_loaded
1112 && !objfile_has_symbols (so
->objfile
))
1114 so_missing_debug_info
= 1;
1115 uiout
->field_string ("syms-read", "Yes (*)");
1118 uiout
->field_string ("syms-read", so
->symbols_loaded
? "Yes" : "No");
1120 uiout
->field_string ("name", so
->so_name
);
1125 do_cleanups (table_cleanup
);
1130 uiout
->message (_("No shared libraries matched.\n"));
1132 uiout
->message (_("No shared libraries loaded at this time.\n"));
1136 if (so_missing_debug_info
)
1137 uiout
->message (_("(*): Shared library is missing "
1138 "debugging information.\n"));
1142 /* Return 1 if ADDRESS lies within SOLIB. */
1145 solib_contains_address_p (const struct so_list
*const solib
,
1148 struct target_section
*p
;
1150 for (p
= solib
->sections
; p
< solib
->sections_end
; p
++)
1151 if (p
->addr
<= address
&& address
< p
->endaddr
)
1157 /* If ADDRESS is in a shared lib in program space PSPACE, return its
1160 Provides a hook for other gdb routines to discover whether or not a
1161 particular address is within the mapped address space of a shared
1164 For example, this routine is called at one point to disable
1165 breakpoints which are in shared libraries that are not currently
1169 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1171 struct so_list
*so
= NULL
;
1173 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1174 if (solib_contains_address_p (so
, address
))
1175 return (so
->so_name
);
1180 /* Return whether the data starting at VADDR, size SIZE, must be kept
1181 in a core file for shared libraries loaded before "gcore" is used
1182 to be handled correctly when the core file is loaded. This only
1183 applies when the section would otherwise not be kept in the core
1184 file (in particular, for readonly sections). */
1187 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1189 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1191 if (ops
->keep_data_in_core
)
1192 return ops
->keep_data_in_core (vaddr
, size
);
1197 /* Called by free_all_symtabs */
1202 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1204 disable_breakpoints_in_shlibs ();
1206 while (so_list_head
)
1208 struct so_list
*so
= so_list_head
;
1210 so_list_head
= so
->next
;
1211 observer_notify_solib_unloaded (so
);
1212 remove_target_sections (so
);
1216 ops
->clear_solib ();
1219 /* Shared library startup support. When GDB starts up the inferior,
1220 it nurses it along (through the shell) until it is ready to execute
1221 its first instruction. At this point, this function gets
1225 solib_create_inferior_hook (int from_tty
)
1227 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1229 ops
->solib_create_inferior_hook (from_tty
);
1232 /* Check to see if an address is in the dynamic loader's dynamic
1233 symbol resolution code. Return 1 if so, 0 otherwise. */
1236 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1238 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1240 return ops
->in_dynsym_resolve_code (pc
);
1243 /* Implements the "sharedlibrary" command. */
1246 sharedlibrary_command (char *args
, int from_tty
)
1249 solib_add (args
, from_tty
, 1);
1252 /* Implements the command "nosharedlibrary", which discards symbols
1253 that have been auto-loaded from shared libraries. Symbols from
1254 shared libraries that were added by explicit request of the user
1255 are not discarded. Also called from remote.c. */
1258 no_shared_libraries (char *ignored
, int from_tty
)
1260 /* The order of the two routines below is important: clear_solib notifies
1261 the solib_unloaded observers, and some of these observers might need
1262 access to their associated objfiles. Therefore, we can not purge the
1263 solibs' objfiles before clear_solib has been called. */
1266 objfile_purge_solibs ();
1272 update_solib_breakpoints (void)
1274 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1276 if (ops
->update_breakpoints
!= NULL
)
1277 ops
->update_breakpoints ();
1283 handle_solib_event (void)
1285 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1287 if (ops
->handle_event
!= NULL
)
1288 ops
->handle_event ();
1290 clear_program_space_solib_cache (current_inferior ()->pspace
);
1292 /* Check for any newly added shared libraries if we're supposed to
1293 be adding them automatically. Switch terminal for any messages
1294 produced by breakpoint_re_set. */
1295 target_terminal_ours_for_output ();
1296 solib_add (NULL
, 0, auto_solib_add
);
1297 target_terminal_inferior ();
1300 /* Reload shared libraries, but avoid reloading the same symbol file
1301 we already have loaded. */
1304 reload_shared_libraries_1 (int from_tty
)
1307 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
1309 if (print_symbol_loading_p (from_tty
, 0, 0))
1310 printf_unfiltered (_("Loading symbols for shared libraries.\n"));
1312 for (so
= so_list_head
; so
!= NULL
; so
= so
->next
)
1314 char *filename
, *found_pathname
= NULL
;
1315 int was_loaded
= so
->symbols_loaded
;
1316 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1319 add_flags
|= SYMFILE_VERBOSE
;
1321 filename
= tilde_expand (so
->so_original_name
);
1322 make_cleanup (xfree
, filename
);
1323 gdb_bfd_ref_ptr
abfd (solib_bfd_open (filename
));
1326 found_pathname
= xstrdup (bfd_get_filename (abfd
.get ()));
1327 make_cleanup (xfree
, found_pathname
);
1330 /* If this shared library is no longer associated with its previous
1331 symbol file, close that. */
1332 if ((found_pathname
== NULL
&& was_loaded
)
1333 || (found_pathname
!= NULL
1334 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1336 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
)
1337 && !solib_used (so
))
1338 free_objfile (so
->objfile
);
1339 remove_target_sections (so
);
1343 /* If this shared library is now associated with a new symbol
1345 if (found_pathname
!= NULL
1347 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1353 solib_map_sections (so
);
1356 CATCH (e
, RETURN_MASK_ERROR
)
1358 exception_fprintf (gdb_stderr
, e
,
1359 _("Error while mapping "
1360 "shared library sections:\n"));
1366 && (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
)))
1367 solib_read_symbols (so
, add_flags
);
1371 do_cleanups (old_chain
);
1375 reload_shared_libraries (char *ignored
, int from_tty
,
1376 struct cmd_list_element
*e
)
1378 const struct target_so_ops
*ops
;
1380 reload_shared_libraries_1 (from_tty
);
1382 ops
= solib_ops (target_gdbarch ());
1384 /* Creating inferior hooks here has two purposes. First, if we reload
1385 shared libraries then the address of solib breakpoint we've computed
1386 previously might be no longer valid. For example, if we forgot to set
1387 solib-absolute-prefix and are setting it right now, then the previous
1388 breakpoint address is plain wrong. Second, installing solib hooks
1389 also implicitly figures were ld.so is and loads symbols for it.
1390 Absent this call, if we've just connected to a target and set
1391 solib-absolute-prefix or solib-search-path, we'll lose all information
1393 if (target_has_execution
)
1395 /* Reset or free private data structures not associated with
1397 ops
->clear_solib ();
1399 /* Remove any previous solib event breakpoint. This is usually
1400 done in common code, at breakpoint_init_inferior time, but
1401 we're not really starting up the inferior here. */
1402 remove_solib_event_breakpoints ();
1404 solib_create_inferior_hook (from_tty
);
1407 /* Sometimes the platform-specific hook loads initial shared
1408 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1409 incorrectly 0 but such solib targets should be fixed anyway. If we
1410 made all the inferior hook methods consistent, this call could be
1411 removed. Call it only after the solib target has been initialized by
1412 solib_create_inferior_hook. */
1414 solib_add (NULL
, 0, auto_solib_add
);
1416 breakpoint_re_set ();
1418 /* We may have loaded or unloaded debug info for some (or all)
1419 shared libraries. However, frames may still reference them. For
1420 example, a frame's unwinder might still point at DWARF FDE
1421 structures that are now freed. Also, getting new symbols may
1422 change our opinion about what is frameless. */
1423 reinit_frame_cache ();
1426 /* Wrapper for reload_shared_libraries that replaces "remote:"
1427 at the start of gdb_sysroot with "target:". */
1430 gdb_sysroot_changed (char *ignored
, int from_tty
,
1431 struct cmd_list_element
*e
)
1433 const char *old_prefix
= "remote:";
1434 const char *new_prefix
= TARGET_SYSROOT_PREFIX
;
1436 if (startswith (gdb_sysroot
, old_prefix
))
1438 static int warning_issued
= 0;
1440 gdb_assert (strlen (old_prefix
) == strlen (new_prefix
));
1441 memcpy (gdb_sysroot
, new_prefix
, strlen (new_prefix
));
1443 if (!warning_issued
)
1445 warning (_("\"%s\" is deprecated, use \"%s\" instead."),
1446 old_prefix
, new_prefix
);
1447 warning (_("sysroot set to \"%s\"."), gdb_sysroot
);
1453 reload_shared_libraries (ignored
, from_tty
, e
);
1457 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1458 struct cmd_list_element
*c
, const char *value
)
1460 fprintf_filtered (file
, _("Autoloading of shared library symbols is %s.\n"),
1465 /* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call
1466 the library-specific handler if it is installed for the current target. */
1469 solib_global_lookup (struct objfile
*objfile
,
1471 const domain_enum domain
)
1473 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1475 if (ops
->lookup_lib_global_symbol
!= NULL
)
1476 return ops
->lookup_lib_global_symbol (objfile
, name
, domain
);
1477 return (struct block_symbol
) {NULL
, NULL
};
1480 /* Lookup the value for a specific symbol from dynamic symbol table. Look
1481 up symbol from ABFD. MATCH_SYM is a callback function to determine
1482 whether to pick up a symbol. DATA is the input of this callback
1483 function. Return NULL if symbol is not found. */
1486 gdb_bfd_lookup_symbol_from_symtab (bfd
*abfd
,
1487 int (*match_sym
) (const asymbol
*,
1491 long storage_needed
= bfd_get_symtab_upper_bound (abfd
);
1492 CORE_ADDR symaddr
= 0;
1494 if (storage_needed
> 0)
1498 asymbol
**symbol_table
= (asymbol
**) xmalloc (storage_needed
);
1499 struct cleanup
*back_to
= make_cleanup (xfree
, symbol_table
);
1500 unsigned int number_of_symbols
=
1501 bfd_canonicalize_symtab (abfd
, symbol_table
);
1503 for (i
= 0; i
< number_of_symbols
; i
++)
1505 asymbol
*sym
= *symbol_table
++;
1507 if (match_sym (sym
, data
))
1509 struct gdbarch
*gdbarch
= target_gdbarch ();
1510 symaddr
= sym
->value
;
1512 /* Some ELF targets fiddle with addresses of symbols they
1513 consider special. They use minimal symbols to do that
1514 and this is needed for correct breakpoint placement,
1515 but we do not have full data here to build a complete
1516 minimal symbol, so just set the address and let the
1517 targets cope with that. */
1518 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1519 && gdbarch_elf_make_msymbol_special_p (gdbarch
))
1521 struct minimal_symbol msym
;
1523 memset (&msym
, 0, sizeof (msym
));
1524 SET_MSYMBOL_VALUE_ADDRESS (&msym
, symaddr
);
1525 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, &msym
);
1526 symaddr
= MSYMBOL_VALUE_RAW_ADDRESS (&msym
);
1529 /* BFD symbols are section relative. */
1530 symaddr
+= sym
->section
->vma
;
1534 do_cleanups (back_to
);
1540 /* Lookup the value for a specific symbol from symbol table. Look up symbol
1541 from ABFD. MATCH_SYM is a callback function to determine whether to pick
1542 up a symbol. DATA is the input of this callback function. Return NULL
1543 if symbol is not found. */
1546 bfd_lookup_symbol_from_dyn_symtab (bfd
*abfd
,
1547 int (*match_sym
) (const asymbol
*,
1551 long storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
1552 CORE_ADDR symaddr
= 0;
1554 if (storage_needed
> 0)
1557 asymbol
**symbol_table
= (asymbol
**) xmalloc (storage_needed
);
1558 struct cleanup
*back_to
= make_cleanup (xfree
, symbol_table
);
1559 unsigned int number_of_symbols
=
1560 bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
1562 for (i
= 0; i
< number_of_symbols
; i
++)
1564 asymbol
*sym
= *symbol_table
++;
1566 if (match_sym (sym
, data
))
1568 /* BFD symbols are section relative. */
1569 symaddr
= sym
->value
+ sym
->section
->vma
;
1573 do_cleanups (back_to
);
1578 /* Lookup the value for a specific symbol from symbol table and dynamic
1579 symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
1580 function to determine whether to pick up a symbol. DATA is the
1581 input of this callback function. Return NULL if symbol is not
1585 gdb_bfd_lookup_symbol (bfd
*abfd
,
1586 int (*match_sym
) (const asymbol
*, const void *),
1589 CORE_ADDR symaddr
= gdb_bfd_lookup_symbol_from_symtab (abfd
, match_sym
, data
);
1591 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
1592 have to check the dynamic string table too. */
1594 symaddr
= bfd_lookup_symbol_from_dyn_symtab (abfd
, match_sym
, data
);
1599 /* SO_LIST_HEAD may contain user-loaded object files that can be removed
1600 out-of-band by the user. So upon notification of free_objfile remove
1601 all references to any user-loaded file that is about to be freed. */
1604 remove_user_added_objfile (struct objfile
*objfile
)
1608 if (objfile
!= 0 && objfile
->flags
& OBJF_USERLOADED
)
1610 for (so
= so_list_head
; so
!= NULL
; so
= so
->next
)
1611 if (so
->objfile
== objfile
)
1616 extern initialize_file_ftype _initialize_solib
; /* -Wmissing-prototypes */
1619 _initialize_solib (void)
1621 solib_data
= gdbarch_data_register_pre_init (solib_init
);
1623 observer_attach_free_objfile (remove_user_added_objfile
);
1625 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1626 _("Load shared object library symbols for files matching REGEXP."));
1627 add_info ("sharedlibrary", info_sharedlibrary_command
,
1628 _("Status of loaded shared object libraries."));
1629 add_info_alias ("dll", "sharedlibrary", 1);
1630 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1631 _("Unload all shared object library symbols."));
1633 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1634 &auto_solib_add
, _("\
1635 Set autoloading of shared library symbols."), _("\
1636 Show autoloading of shared library symbols."), _("\
1637 If \"on\", symbols from all shared object libraries will be loaded\n\
1638 automatically when the inferior begins execution, when the dynamic linker\n\
1639 informs gdb that a new library has been loaded, or when attaching to the\n\
1640 inferior. Otherwise, symbols must be loaded manually, using \
1643 show_auto_solib_add
,
1644 &setlist
, &showlist
);
1646 add_setshow_optional_filename_cmd ("sysroot", class_support
,
1648 Set an alternate system root."), _("\
1649 Show the current system root."), _("\
1650 The system root is used to load absolute shared library symbol files.\n\
1651 For other (relative) files, you can add directories using\n\
1652 `set solib-search-path'."),
1653 gdb_sysroot_changed
,
1655 &setlist
, &showlist
);
1657 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1659 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1662 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1663 &solib_search_path
, _("\
1664 Set the search path for loading non-absolute shared library symbol files."),
1666 Show the search path for loading non-absolute shared library symbol files."),
1668 This takes precedence over the environment variables \
1669 PATH and LD_LIBRARY_PATH."),
1670 reload_shared_libraries
,
1671 show_solib_search_path
,
1672 &setlist
, &showlist
);