1 /* Handle shared libraries for GDB, the GNU Debugger.
3 Copyright (C) 1990-2018 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 or a
115 shared library file), or NULL if not found. If FD is non-NULL, *FD
116 is set to either -1 or an open file handle for the binary file.
118 Global variable GDB_SYSROOT is used as a prefix directory
119 to search for binary files if they have an absolute path.
120 If GDB_SYSROOT starts with "target:" and target filesystem
121 is the local filesystem then the "target:" prefix will be
122 stripped before the search starts. This ensures that the
123 same search algorithm is used for local files regardless of
124 whether a "target:" prefix was used.
126 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
127 (or set of directories, as in LD_LIBRARY_PATH) to search for all
128 shared libraries if not found in either the sysroot (if set) or
129 the local filesystem. SOLIB_SEARCH_PATH is not used when searching
130 for the main executable.
133 * If a sysroot is set and path is absolute:
134 * Search for sysroot/path.
136 * Look for it literally (unmodified).
137 * If IS_SOLIB is non-zero:
138 * Look in SOLIB_SEARCH_PATH.
139 * If available, use target defined search function.
140 * If NO sysroot is set, perform the following two searches:
141 * Look in inferior's $PATH.
142 * If IS_SOLIB is non-zero:
143 * Look in inferior's $LD_LIBRARY_PATH.
145 * The last check avoids doing this search when targetting remote
146 * machines since a sysroot will almost always be set.
149 static gdb::unique_xmalloc_ptr
<char>
150 solib_find_1 (const char *in_pathname
, int *fd
, int is_solib
)
152 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
154 char *temp_pathname
= NULL
;
155 const char *fskind
= effective_target_file_system_kind ();
156 const char *sysroot
= gdb_sysroot
;
157 int prefix_len
, orig_prefix_len
;
159 /* If the absolute prefix starts with "target:" but the filesystem
160 accessed by the target_fileio_* methods is the local filesystem
161 then we strip the "target:" prefix now and work with the local
162 filesystem. This ensures that the same search algorithm is used
163 for all local files regardless of whether a "target:" prefix was
165 if (is_target_filename (sysroot
) && target_filesystem_is_local ())
166 sysroot
+= strlen (TARGET_SYSROOT_PREFIX
);
168 /* Strip any trailing slashes from the absolute prefix. */
169 prefix_len
= orig_prefix_len
= strlen (sysroot
);
171 while (prefix_len
> 0 && IS_DIR_SEPARATOR (sysroot
[prefix_len
- 1]))
174 std::string sysroot_holder
;
177 else if (prefix_len
!= orig_prefix_len
)
179 sysroot_holder
= std::string (sysroot
, prefix_len
);
180 sysroot
= sysroot_holder
.c_str ();
183 /* If we're on a non-DOS-based system, backslashes won't be
184 understood as directory separator, so, convert them to forward
185 slashes, iff we're supposed to handle DOS-based file system
186 semantics for target paths. */
187 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
191 /* Avoid clobbering our input. */
192 p
= (char *) alloca (strlen (in_pathname
) + 1);
193 strcpy (p
, in_pathname
);
203 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
204 IS_ABSOLUTE_PATH. The latter is for host paths only, while
205 IN_PATHNAME is a target path. For example, if we're supposed to
206 be handling DOS-like semantics we want to consider a
207 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
208 With such a path, before giving up on the sysroot, we'll try:
210 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
211 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
212 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
215 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || sysroot
== NULL
)
216 temp_pathname
= xstrdup (in_pathname
);
219 int need_dir_separator
;
221 /* Concatenate the sysroot and the target reported filename. We
222 may need to glue them with a directory separator. Cases to
225 | sysroot | separator | in_pathname |
226 |-----------------+-----------+----------------|
227 | /some/dir | / | c:/foo/bar.dll |
228 | /some/dir | | /foo/bar.dll |
229 | target: | | c:/foo/bar.dll |
230 | target: | | /foo/bar.dll |
231 | target:some/dir | / | c:/foo/bar.dll |
232 | target:some/dir | | /foo/bar.dll |
234 IOW, we don't need to add a separator if IN_PATHNAME already
235 has one, or when the the sysroot is exactly "target:".
236 There's no need to check for drive spec explicitly, as we only
237 get here if IN_PATHNAME is considered an absolute path. */
238 need_dir_separator
= !(IS_DIR_SEPARATOR (in_pathname
[0])
239 || strcmp (TARGET_SYSROOT_PREFIX
, sysroot
) == 0);
241 /* Cat the prefixed pathname together. */
242 temp_pathname
= concat (sysroot
,
243 need_dir_separator
? SLASH_STRING
: "",
244 in_pathname
, (char *) NULL
);
247 /* Handle files to be accessed via the target. */
248 if (is_target_filename (temp_pathname
))
252 return gdb::unique_xmalloc_ptr
<char> (temp_pathname
);
255 /* Now see if we can open it. */
256 found_file
= gdb_open_cloexec (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
258 xfree (temp_pathname
);
260 /* If the search in gdb_sysroot failed, and the path name has a
261 drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
262 and retrying in the sysroot:
263 c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
267 && HAS_TARGET_DRIVE_SPEC (fskind
, in_pathname
))
269 int need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
270 char *drive
= savestring (in_pathname
, 1);
272 temp_pathname
= concat (sysroot
,
275 need_dir_separator
? SLASH_STRING
: "",
276 in_pathname
+ 2, (char *) NULL
);
279 found_file
= gdb_open_cloexec (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
282 xfree (temp_pathname
);
284 /* If the search in gdb_sysroot still failed, try fully
285 stripping the drive spec, and trying once more in the
286 sysroot before giving up.
288 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
290 temp_pathname
= concat (sysroot
,
291 need_dir_separator
? SLASH_STRING
: "",
292 in_pathname
+ 2, (char *) NULL
);
294 found_file
= gdb_open_cloexec (temp_pathname
, O_RDONLY
| O_BINARY
, 0);
296 xfree (temp_pathname
);
300 /* We try to find the library in various ways. After each attempt,
301 either found_file >= 0 and temp_pathname is a malloc'd string, or
302 found_file < 0 and temp_pathname does not point to storage that
303 needs to be freed. */
306 temp_pathname
= NULL
;
308 /* If the search in gdb_sysroot failed, and the path name is
309 absolute at this point, make it relative. (openp will try and open the
310 file according to its absolute path otherwise, which is not what we want.)
311 Affects subsequent searches for this solib. */
312 if (found_file
< 0 && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
314 /* First, get rid of any drive letters etc. */
315 while (!IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
318 /* Next, get rid of all leading dir separators. */
319 while (IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
323 /* If not found, and we're looking for a solib, search the
324 solib_search_path (if any). */
325 if (is_solib
&& found_file
< 0 && solib_search_path
!= NULL
)
326 found_file
= openp (solib_search_path
,
327 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
328 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
330 /* If not found, and we're looking for a solib, next search the
331 solib_search_path (if any) for the basename only (ignoring the
332 path). This is to allow reading solibs from a path that differs
333 from the opened path. */
334 if (is_solib
&& found_file
< 0 && solib_search_path
!= NULL
)
335 found_file
= openp (solib_search_path
,
336 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
337 target_lbasename (fskind
, in_pathname
),
338 O_RDONLY
| O_BINARY
, &temp_pathname
);
340 /* If not found, and we're looking for a solib, try to use target
341 supplied solib search method. */
342 if (is_solib
&& found_file
< 0 && ops
->find_and_open_solib
)
343 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
346 /* If not found, next search the inferior's $PATH environment variable. */
347 if (found_file
< 0 && sysroot
== NULL
)
348 found_file
= openp (current_inferior ()->environment
.get ("PATH"),
349 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
350 O_RDONLY
| O_BINARY
, &temp_pathname
);
352 /* If not found, and we're looking for a solib, next search the
353 inferior's $LD_LIBRARY_PATH environment variable. */
354 if (is_solib
&& found_file
< 0 && sysroot
== NULL
)
355 found_file
= openp (current_inferior ()->environment
.get
357 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
358 O_RDONLY
| O_BINARY
, &temp_pathname
);
368 return gdb::unique_xmalloc_ptr
<char> (temp_pathname
);
371 /* Return the full pathname of the main executable, or NULL if not
372 found. If FD is non-NULL, *FD is set to either -1 or an open file
373 handle for the main executable. */
375 gdb::unique_xmalloc_ptr
<char>
376 exec_file_find (const char *in_pathname
, int *fd
)
378 gdb::unique_xmalloc_ptr
<char> result
;
379 const char *fskind
= effective_target_file_system_kind ();
381 if (in_pathname
== NULL
)
384 if (*gdb_sysroot
!= '\0' && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
386 result
= solib_find_1 (in_pathname
, fd
, 0);
388 if (result
== NULL
&& fskind
== file_system_kind_dos_based
)
392 new_pathname
= (char *) alloca (strlen (in_pathname
) + 5);
393 strcpy (new_pathname
, in_pathname
);
394 strcat (new_pathname
, ".exe");
396 result
= solib_find_1 (new_pathname
, fd
, 0);
401 /* It's possible we don't have a full path, but rather just a
402 filename. Some targets, such as HP-UX, don't provide the
405 Attempt to qualify the filename against the source path.
406 (If that fails, we'll just fall back on the original
407 filename. Not much more we can do...) */
409 char *full_path
= NULL
;
410 if (source_full_path_of (in_pathname
, &full_path
))
411 result
.reset (full_path
);
413 result
.reset (xstrdup (in_pathname
));
421 /* Return the full pathname of a shared library file, or NULL if not
422 found. If FD is non-NULL, *FD is set to either -1 or an open file
423 handle for the shared library.
425 The search algorithm used is described in solib_find_1's comment
428 gdb::unique_xmalloc_ptr
<char>
429 solib_find (const char *in_pathname
, int *fd
)
431 const char *solib_symbols_extension
432 = gdbarch_solib_symbols_extension (target_gdbarch ());
434 /* If solib_symbols_extension is set, replace the file's
436 if (solib_symbols_extension
!= NULL
)
438 const char *p
= in_pathname
+ strlen (in_pathname
);
440 while (p
> in_pathname
&& *p
!= '.')
448 = (char *) alloca (p
- in_pathname
+ 1
449 + strlen (solib_symbols_extension
) + 1);
450 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
451 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
452 solib_symbols_extension
);
454 in_pathname
= new_pathname
;
458 return solib_find_1 (in_pathname
, fd
, 1);
461 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
462 it is used as file handle to open the file. Throws an error if the file
463 could not be opened. Handles both local and remote file access.
465 If unsuccessful, the FD will be closed (unless FD was -1). */
468 solib_bfd_fopen (const char *pathname
, int fd
)
470 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (pathname
, gnutarget
, fd
));
472 if (abfd
!= NULL
&& !gdb_bfd_has_target_filename (abfd
.get ()))
473 bfd_set_cacheable (abfd
.get (), 1);
477 /* Arrange to free PATHNAME when the error is thrown. */
478 error (_("Could not open `%s' as an executable file: %s"),
479 pathname
, bfd_errmsg (bfd_get_error ()));
485 /* Find shared library PATHNAME and open a BFD for it. */
488 solib_bfd_open (char *pathname
)
491 const struct bfd_arch_info
*b
;
493 /* Search for shared library file. */
494 gdb::unique_xmalloc_ptr
<char> found_pathname
495 = solib_find (pathname
, &found_file
);
496 if (found_pathname
== NULL
)
498 /* Return failure if the file could not be found, so that we can
499 accumulate messages about missing libraries. */
503 perror_with_name (pathname
);
506 /* Open bfd for shared library. */
507 gdb_bfd_ref_ptr
abfd (solib_bfd_fopen (found_pathname
.get (), found_file
));
509 /* Check bfd format. */
510 if (!bfd_check_format (abfd
.get (), bfd_object
))
511 error (_("`%s': not in executable format: %s"),
512 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
514 /* Check bfd arch. */
515 b
= gdbarch_bfd_arch_info (target_gdbarch ());
516 if (!b
->compatible (b
, bfd_get_arch_info (abfd
.get ())))
517 warning (_("`%s': Shared library architecture %s is not compatible "
518 "with target architecture %s."), bfd_get_filename (abfd
),
519 bfd_get_arch_info (abfd
.get ())->printable_name
,
525 /* Given a pointer to one of the shared objects in our list of mapped
526 objects, use the recorded name to open a bfd descriptor for the
527 object, build a section table, relocate all the section addresses
528 by the base address at which the shared object was mapped, and then
529 add the sections to the target's section table.
531 FIXME: In most (all?) cases the shared object file name recorded in
532 the dynamic linkage tables will be a fully qualified pathname. For
533 cases where it isn't, do we really mimic the systems search
534 mechanism correctly in the below code (particularly the tilde
535 expansion stuff?). */
538 solib_map_sections (struct so_list
*so
)
540 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
541 struct target_section
*p
;
543 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (so
->so_name
));
544 gdb_bfd_ref_ptr
abfd (ops
->bfd_open (filename
.get ()));
549 /* Leave bfd open, core_xfer_memory and "info files" need it. */
550 so
->abfd
= abfd
.release ();
552 /* Copy the full path name into so_name, allowing symbol_file_add
553 to find it later. This also affects the =library-loaded GDB/MI
554 event, and in particular the part of that notification providing
555 the library's host-side path. If we let the target dictate
556 that objfile's path, and the target is different from the host,
557 GDB/MI will not provide the correct host-side path. */
558 if (strlen (bfd_get_filename (so
->abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
559 error (_("Shared library file name is too long."));
560 strcpy (so
->so_name
, bfd_get_filename (so
->abfd
));
562 if (build_section_table (so
->abfd
, &so
->sections
, &so
->sections_end
))
564 error (_("Can't find the file sections in `%s': %s"),
565 bfd_get_filename (so
->abfd
), bfd_errmsg (bfd_get_error ()));
568 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
570 /* Relocate the section binding addresses as recorded in the shared
571 object's file by the base address to which the object was actually
573 ops
->relocate_section_addresses (so
, p
);
575 /* If the target didn't provide information about the address
576 range of the shared object, assume we want the location of
577 the .text section. */
578 if (so
->addr_low
== 0 && so
->addr_high
== 0
579 && strcmp (p
->the_bfd_section
->name
, ".text") == 0)
581 so
->addr_low
= p
->addr
;
582 so
->addr_high
= p
->endaddr
;
586 /* Add the shared object's sections to the current set of file
587 section tables. Do this immediately after mapping the object so
588 that later nodes in the list can query this object, as is needed
590 add_target_sections (so
, so
->sections
, so
->sections_end
);
595 /* Free symbol-file related contents of SO and reset for possible reloading
596 of SO. If we have opened a BFD for SO, close it. If we have placed SO's
597 sections in some target's section table, the caller is responsible for
600 This function doesn't mess with objfiles at all. If there is an
601 objfile associated with SO that needs to be removed, the caller is
602 responsible for taking care of that. */
605 clear_so (struct so_list
*so
)
607 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
611 xfree (so
->sections
);
612 so
->sections
= so
->sections_end
= NULL
;
615 gdb_bfd_unref (so
->abfd
);
618 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
619 so
->symbols_loaded
= 0;
622 so
->addr_low
= so
->addr_high
= 0;
624 /* Restore the target-supplied file name. SO_NAME may be the path
625 of the symbol file. */
626 strcpy (so
->so_name
, so
->so_original_name
);
628 /* Do the same for target-specific data. */
629 if (ops
->clear_so
!= NULL
)
633 /* Free the storage associated with the `struct so_list' object SO.
634 If we have opened a BFD for SO, close it.
636 The caller is responsible for removing SO from whatever list it is
637 a member of. If we have placed SO's sections in some target's
638 section table, the caller is responsible for removing them.
640 This function doesn't mess with objfiles at all. If there is an
641 objfile associated with SO that needs to be removed, the caller is
642 responsible for taking care of that. */
645 free_so (struct so_list
*so
)
647 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
656 /* Return address of first so_list entry in master shared object list. */
658 master_so_list (void)
663 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
664 be chatty about it. Return non-zero if any symbols were actually
668 solib_read_symbols (struct so_list
*so
, symfile_add_flags flags
)
670 if (so
->symbols_loaded
)
672 /* If needed, we've already warned in our caller. */
674 else if (so
->abfd
== NULL
)
676 /* We've already warned about this library, when trying to open
682 flags
|= current_inferior ()->symfile_flags
;
686 struct section_addr_info
*sap
;
688 /* Have we already loaded this shared object? */
689 ALL_OBJFILES (so
->objfile
)
691 if (filename_cmp (objfile_name (so
->objfile
), so
->so_name
) == 0
692 && so
->objfile
->addr_low
== so
->addr_low
)
695 if (so
->objfile
== NULL
)
697 sap
= build_section_addr_info_from_section_table (so
->sections
,
699 so
->objfile
= symbol_file_add_from_bfd (so
->abfd
, so
->so_name
,
700 flags
, sap
, OBJF_SHARED
,
702 so
->objfile
->addr_low
= so
->addr_low
;
703 free_section_addr_info (sap
);
706 so
->symbols_loaded
= 1;
708 CATCH (e
, RETURN_MASK_ERROR
)
710 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
711 " library symbols for %s:\n"),
722 /* Return 1 if KNOWN->objfile is used by any other so_list object in the
723 SO_LIST_HEAD list. Return 0 otherwise. */
726 solib_used (const struct so_list
*const known
)
728 const struct so_list
*pivot
;
730 for (pivot
= so_list_head
; pivot
!= NULL
; pivot
= pivot
->next
)
731 if (pivot
!= known
&& pivot
->objfile
== known
->objfile
)
739 update_solib_list (int from_tty
)
741 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
742 struct so_list
*inferior
= ops
->current_sos();
743 struct so_list
*gdb
, **gdb_link
;
745 /* We can reach here due to changing solib-search-path or the
746 sysroot, before having any inferior. */
747 if (target_has_execution
&& !ptid_equal (inferior_ptid
, null_ptid
))
749 struct inferior
*inf
= current_inferior ();
751 /* If we are attaching to a running process for which we
752 have not opened a symbol file, we may be able to get its
754 if (inf
->attach_flag
&& symfile_objfile
== NULL
)
758 ops
->open_symbol_file_object (from_tty
);
760 CATCH (ex
, RETURN_MASK_ALL
)
762 exception_fprintf (gdb_stderr
, ex
,
763 "Error reading attached "
764 "process's symbol file.\n");
770 /* GDB and the inferior's dynamic linker each maintain their own
771 list of currently loaded shared objects; we want to bring the
772 former in sync with the latter. Scan both lists, seeing which
773 shared objects appear where. There are three cases:
775 - A shared object appears on both lists. This means that GDB
776 knows about it already, and it's still loaded in the inferior.
777 Nothing needs to happen.
779 - A shared object appears only on GDB's list. This means that
780 the inferior has unloaded it. We should remove the shared
781 object from GDB's tables.
783 - A shared object appears only on the inferior's list. This
784 means that it's just been loaded. We should add it to GDB's
787 So we walk GDB's list, checking each entry to see if it appears
788 in the inferior's list too. If it does, no action is needed, and
789 we remove it from the inferior's list. If it doesn't, the
790 inferior has unloaded it, and we remove it from GDB's list. By
791 the time we're done walking GDB's list, the inferior's list
792 contains only the new shared objects, which we then add. */
795 gdb_link
= &so_list_head
;
798 struct so_list
*i
= inferior
;
799 struct so_list
**i_link
= &inferior
;
801 /* Check to see whether the shared object *gdb also appears in
802 the inferior's current list. */
807 if (ops
->same (gdb
, i
))
812 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
820 /* If the shared object appears on the inferior's list too, then
821 it's still loaded, so we don't need to do anything. Delete
822 it from the inferior's list, and leave it on GDB's list. */
827 gdb_link
= &gdb
->next
;
831 /* If it's not on the inferior's list, remove it from GDB's tables. */
834 /* Notify any observer that the shared object has been
835 unloaded before we remove it from GDB's tables. */
836 observer_notify_solib_unloaded (gdb
);
838 VEC_safe_push (char_ptr
, current_program_space
->deleted_solibs
,
839 xstrdup (gdb
->so_name
));
841 *gdb_link
= gdb
->next
;
843 /* Unless the user loaded it explicitly, free SO's objfile. */
844 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
)
845 && !solib_used (gdb
))
848 /* Some targets' section tables might be referring to
849 sections from so->abfd; remove them. */
850 remove_target_sections (gdb
);
857 /* Now the inferior's list contains only shared objects that don't
858 appear in GDB's list --- those that are newly loaded. Add them
859 to GDB's shared object list. */
863 const char *not_found_filename
= NULL
;
867 /* Add the new shared objects to GDB's list. */
868 *gdb_link
= inferior
;
870 /* Fill in the rest of each of the `struct so_list' nodes. */
871 for (i
= inferior
; i
; i
= i
->next
)
874 i
->pspace
= current_program_space
;
875 VEC_safe_push (so_list_ptr
, current_program_space
->added_solibs
, i
);
879 /* Fill in the rest of the `struct so_list' node. */
880 if (!solib_map_sections (i
))
883 if (not_found_filename
== NULL
)
884 not_found_filename
= i
->so_original_name
;
888 CATCH (e
, RETURN_MASK_ERROR
)
890 exception_fprintf (gdb_stderr
, e
,
891 _("Error while mapping shared "
892 "library sections:\n"));
896 /* Notify any observer that the shared object has been
897 loaded now that we've added it to GDB's tables. */
898 observer_notify_solib_loaded (i
);
901 /* If a library was not found, issue an appropriate warning
902 message. We have to use a single call to warning in case the
903 front end does something special with warnings, e.g., pop up
904 a dialog box. It Would Be Nice if we could get a "warning: "
905 prefix on each line in the CLI front end, though - it doesn't
909 warning (_("Could not load shared library symbols for %s.\n"
910 "Do you need \"set solib-search-path\" "
911 "or \"set sysroot\"?"),
913 else if (not_found
> 1)
915 Could not load shared library symbols for %d libraries, e.g. %s.\n\
916 Use the \"info sharedlibrary\" command to see the complete listing.\n\
917 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
918 not_found
, not_found_filename
);
923 /* Return non-zero if NAME is the libpthread shared library.
925 Uses a fairly simplistic heuristic approach where we check
926 the file name against "/libpthread". This can lead to false
927 positives, but this should be good enough in practice. */
930 libpthread_name_p (const char *name
)
932 return (strstr (name
, "/libpthread") != NULL
);
935 /* Return non-zero if SO is the libpthread shared library. */
938 libpthread_solib_p (struct so_list
*so
)
940 return libpthread_name_p (so
->so_name
);
943 /* Read in symbolic information for any shared objects whose names
944 match PATTERN. (If we've already read a shared object's symbol
945 info, leave it alone.) If PATTERN is zero, read them all.
947 If READSYMS is 0, defer reading symbolic information until later
948 but still do any needed low level processing.
950 FROM_TTY is described for update_solib_list, above. */
953 solib_add (const char *pattern
, int from_tty
, int readsyms
)
957 if (print_symbol_loading_p (from_tty
, 0, 0))
961 printf_unfiltered (_("Loading symbols for shared libraries: %s\n"),
965 printf_unfiltered (_("Loading symbols for shared libraries.\n"));
968 current_program_space
->solib_add_generation
++;
972 char *re_err
= re_comp (pattern
);
975 error (_("Invalid regexp: %s"), re_err
);
978 update_solib_list (from_tty
);
980 /* Walk the list of currently loaded shared libraries, and read
981 symbols for any that match the pattern --- or any whose symbols
982 aren't already loaded, if no pattern was given. */
985 int loaded_any_symbols
= 0;
986 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
989 add_flags
|= SYMFILE_VERBOSE
;
991 for (gdb
= so_list_head
; gdb
; gdb
= gdb
->next
)
992 if (! pattern
|| re_exec (gdb
->so_name
))
994 /* Normally, we would read the symbols from that library
995 only if READSYMS is set. However, we're making a small
996 exception for the pthread library, because we sometimes
997 need the library symbols to be loaded in order to provide
998 thread support (x86-linux for instance). */
999 const int add_this_solib
=
1000 (readsyms
|| libpthread_solib_p (gdb
));
1005 if (gdb
->symbols_loaded
)
1007 /* If no pattern was given, be quiet for shared
1008 libraries we have already loaded. */
1009 if (pattern
&& (from_tty
|| info_verbose
))
1010 printf_unfiltered (_("Symbols already loaded for %s\n"),
1013 else if (solib_read_symbols (gdb
, add_flags
))
1014 loaded_any_symbols
= 1;
1018 if (loaded_any_symbols
)
1019 breakpoint_re_set ();
1021 if (from_tty
&& pattern
&& ! any_matches
)
1023 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
1025 if (loaded_any_symbols
)
1027 /* Getting new symbols may change our opinion about what is
1029 reinit_frame_cache ();
1034 /* Implement the "info sharedlibrary" command. Walk through the
1035 shared library list and print information about each attached
1036 library matching PATTERN. If PATTERN is elided, print them
1040 info_sharedlibrary_command (const char *pattern
, int from_tty
)
1042 struct so_list
*so
= NULL
; /* link map state variable */
1043 int so_missing_debug_info
= 0;
1046 struct gdbarch
*gdbarch
= target_gdbarch ();
1047 struct ui_out
*uiout
= current_uiout
;
1051 char *re_err
= re_comp (pattern
);
1054 error (_("Invalid regexp: %s"), re_err
);
1057 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1058 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1060 update_solib_list (from_tty
);
1062 /* ui_out_emit_table table_emitter needs to know the number of rows,
1063 so we need to make two passes over the libs. */
1065 for (nr_libs
= 0, so
= so_list_head
; so
; so
= so
->next
)
1069 if (pattern
&& ! re_exec (so
->so_name
))
1076 ui_out_emit_table
table_emitter (uiout
, 4, nr_libs
, "SharedLibraryTable");
1078 /* The "- 1" is because ui_out adds one space between columns. */
1079 uiout
->table_header (addr_width
- 1, ui_left
, "from", "From");
1080 uiout
->table_header (addr_width
- 1, ui_left
, "to", "To");
1081 uiout
->table_header (12 - 1, ui_left
, "syms-read", "Syms Read");
1082 uiout
->table_header (0, ui_noalign
, "name", "Shared Object Library");
1084 uiout
->table_body ();
1088 if (! so
->so_name
[0])
1090 if (pattern
&& ! re_exec (so
->so_name
))
1093 ui_out_emit_tuple
tuple_emitter (uiout
, "lib");
1095 if (so
->addr_high
!= 0)
1097 uiout
->field_core_addr ("from", gdbarch
, so
->addr_low
);
1098 uiout
->field_core_addr ("to", gdbarch
, so
->addr_high
);
1102 uiout
->field_skip ("from");
1103 uiout
->field_skip ("to");
1106 if (! interp_ui_out (top_level_interpreter ())->is_mi_like_p ()
1107 && so
->symbols_loaded
1108 && !objfile_has_symbols (so
->objfile
))
1110 so_missing_debug_info
= 1;
1111 uiout
->field_string ("syms-read", "Yes (*)");
1114 uiout
->field_string ("syms-read", so
->symbols_loaded
? "Yes" : "No");
1116 uiout
->field_string ("name", so
->so_name
);
1125 uiout
->message (_("No shared libraries matched.\n"));
1127 uiout
->message (_("No shared libraries loaded at this time.\n"));
1131 if (so_missing_debug_info
)
1132 uiout
->message (_("(*): Shared library is missing "
1133 "debugging information.\n"));
1137 /* Return 1 if ADDRESS lies within SOLIB. */
1140 solib_contains_address_p (const struct so_list
*const solib
,
1143 struct target_section
*p
;
1145 for (p
= solib
->sections
; p
< solib
->sections_end
; p
++)
1146 if (p
->addr
<= address
&& address
< p
->endaddr
)
1152 /* If ADDRESS is in a shared lib in program space PSPACE, return its
1155 Provides a hook for other gdb routines to discover whether or not a
1156 particular address is within the mapped address space of a shared
1159 For example, this routine is called at one point to disable
1160 breakpoints which are in shared libraries that are not currently
1164 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1166 struct so_list
*so
= NULL
;
1168 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1169 if (solib_contains_address_p (so
, address
))
1170 return (so
->so_name
);
1175 /* Return whether the data starting at VADDR, size SIZE, must be kept
1176 in a core file for shared libraries loaded before "gcore" is used
1177 to be handled correctly when the core file is loaded. This only
1178 applies when the section would otherwise not be kept in the core
1179 file (in particular, for readonly sections). */
1182 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1184 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1186 if (ops
->keep_data_in_core
)
1187 return ops
->keep_data_in_core (vaddr
, size
);
1192 /* Called by free_all_symtabs */
1197 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1199 disable_breakpoints_in_shlibs ();
1201 while (so_list_head
)
1203 struct so_list
*so
= so_list_head
;
1205 so_list_head
= so
->next
;
1206 observer_notify_solib_unloaded (so
);
1207 remove_target_sections (so
);
1211 ops
->clear_solib ();
1214 /* Shared library startup support. When GDB starts up the inferior,
1215 it nurses it along (through the shell) until it is ready to execute
1216 its first instruction. At this point, this function gets
1220 solib_create_inferior_hook (int from_tty
)
1222 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1224 ops
->solib_create_inferior_hook (from_tty
);
1227 /* Check to see if an address is in the dynamic loader's dynamic
1228 symbol resolution code. Return 1 if so, 0 otherwise. */
1231 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1233 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1235 return ops
->in_dynsym_resolve_code (pc
);
1238 /* Implements the "sharedlibrary" command. */
1241 sharedlibrary_command (const char *args
, int from_tty
)
1244 solib_add (args
, from_tty
, 1);
1247 /* Implements the command "nosharedlibrary", which discards symbols
1248 that have been auto-loaded from shared libraries. Symbols from
1249 shared libraries that were added by explicit request of the user
1250 are not discarded. Also called from remote.c. */
1253 no_shared_libraries (const char *ignored
, int from_tty
)
1255 /* The order of the two routines below is important: clear_solib notifies
1256 the solib_unloaded observers, and some of these observers might need
1257 access to their associated objfiles. Therefore, we can not purge the
1258 solibs' objfiles before clear_solib has been called. */
1261 objfile_purge_solibs ();
1267 update_solib_breakpoints (void)
1269 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1271 if (ops
->update_breakpoints
!= NULL
)
1272 ops
->update_breakpoints ();
1278 handle_solib_event (void)
1280 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1282 if (ops
->handle_event
!= NULL
)
1283 ops
->handle_event ();
1285 clear_program_space_solib_cache (current_inferior ()->pspace
);
1287 /* Check for any newly added shared libraries if we're supposed to
1288 be adding them automatically. Switch terminal for any messages
1289 produced by breakpoint_re_set. */
1290 target_terminal::ours_for_output ();
1291 solib_add (NULL
, 0, auto_solib_add
);
1292 target_terminal::inferior ();
1295 /* Reload shared libraries, but avoid reloading the same symbol file
1296 we already have loaded. */
1299 reload_shared_libraries_1 (int from_tty
)
1303 if (print_symbol_loading_p (from_tty
, 0, 0))
1304 printf_unfiltered (_("Loading symbols for shared libraries.\n"));
1306 for (so
= so_list_head
; so
!= NULL
; so
= so
->next
)
1308 char *found_pathname
= NULL
;
1309 int was_loaded
= so
->symbols_loaded
;
1310 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1313 add_flags
|= SYMFILE_VERBOSE
;
1315 gdb::unique_xmalloc_ptr
<char> filename
1316 (tilde_expand (so
->so_original_name
));
1317 gdb_bfd_ref_ptr
abfd (solib_bfd_open (filename
.get ()));
1319 found_pathname
= bfd_get_filename (abfd
.get ());
1321 /* If this shared library is no longer associated with its previous
1322 symbol file, close that. */
1323 if ((found_pathname
== NULL
&& was_loaded
)
1324 || (found_pathname
!= NULL
1325 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1327 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
)
1328 && !solib_used (so
))
1330 remove_target_sections (so
);
1334 /* If this shared library is now associated with a new symbol
1336 if (found_pathname
!= NULL
1338 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1344 solib_map_sections (so
);
1347 CATCH (e
, RETURN_MASK_ERROR
)
1349 exception_fprintf (gdb_stderr
, e
,
1350 _("Error while mapping "
1351 "shared library sections:\n"));
1357 && (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
)))
1358 solib_read_symbols (so
, add_flags
);
1364 reload_shared_libraries (const char *ignored
, int from_tty
,
1365 struct cmd_list_element
*e
)
1367 const struct target_so_ops
*ops
;
1369 reload_shared_libraries_1 (from_tty
);
1371 ops
= solib_ops (target_gdbarch ());
1373 /* Creating inferior hooks here has two purposes. First, if we reload
1374 shared libraries then the address of solib breakpoint we've computed
1375 previously might be no longer valid. For example, if we forgot to set
1376 solib-absolute-prefix and are setting it right now, then the previous
1377 breakpoint address is plain wrong. Second, installing solib hooks
1378 also implicitly figures were ld.so is and loads symbols for it.
1379 Absent this call, if we've just connected to a target and set
1380 solib-absolute-prefix or solib-search-path, we'll lose all information
1382 if (target_has_execution
)
1384 /* Reset or free private data structures not associated with
1386 ops
->clear_solib ();
1388 /* Remove any previous solib event breakpoint. This is usually
1389 done in common code, at breakpoint_init_inferior time, but
1390 we're not really starting up the inferior here. */
1391 remove_solib_event_breakpoints ();
1393 solib_create_inferior_hook (from_tty
);
1396 /* Sometimes the platform-specific hook loads initial shared
1397 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1398 incorrectly 0 but such solib targets should be fixed anyway. If we
1399 made all the inferior hook methods consistent, this call could be
1400 removed. Call it only after the solib target has been initialized by
1401 solib_create_inferior_hook. */
1403 solib_add (NULL
, 0, auto_solib_add
);
1405 breakpoint_re_set ();
1407 /* We may have loaded or unloaded debug info for some (or all)
1408 shared libraries. However, frames may still reference them. For
1409 example, a frame's unwinder might still point at DWARF FDE
1410 structures that are now freed. Also, getting new symbols may
1411 change our opinion about what is frameless. */
1412 reinit_frame_cache ();
1415 /* Wrapper for reload_shared_libraries that replaces "remote:"
1416 at the start of gdb_sysroot with "target:". */
1419 gdb_sysroot_changed (const char *ignored
, int from_tty
,
1420 struct cmd_list_element
*e
)
1422 const char *old_prefix
= "remote:";
1423 const char *new_prefix
= TARGET_SYSROOT_PREFIX
;
1425 if (startswith (gdb_sysroot
, old_prefix
))
1427 static int warning_issued
= 0;
1429 gdb_assert (strlen (old_prefix
) == strlen (new_prefix
));
1430 memcpy (gdb_sysroot
, new_prefix
, strlen (new_prefix
));
1432 if (!warning_issued
)
1434 warning (_("\"%s\" is deprecated, use \"%s\" instead."),
1435 old_prefix
, new_prefix
);
1436 warning (_("sysroot set to \"%s\"."), gdb_sysroot
);
1442 reload_shared_libraries (ignored
, from_tty
, e
);
1446 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1447 struct cmd_list_element
*c
, const char *value
)
1449 fprintf_filtered (file
, _("Autoloading of shared library symbols is %s.\n"),
1454 /* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call
1455 the library-specific handler if it is installed for the current target. */
1458 solib_global_lookup (struct objfile
*objfile
,
1460 const domain_enum domain
)
1462 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1464 if (ops
->lookup_lib_global_symbol
!= NULL
)
1465 return ops
->lookup_lib_global_symbol (objfile
, name
, domain
);
1466 return (struct block_symbol
) {NULL
, NULL
};
1469 /* Lookup the value for a specific symbol from dynamic symbol table. Look
1470 up symbol from ABFD. MATCH_SYM is a callback function to determine
1471 whether to pick up a symbol. DATA is the input of this callback
1472 function. Return NULL if symbol is not found. */
1475 gdb_bfd_lookup_symbol_from_symtab (bfd
*abfd
,
1476 int (*match_sym
) (const asymbol
*,
1480 long storage_needed
= bfd_get_symtab_upper_bound (abfd
);
1481 CORE_ADDR symaddr
= 0;
1483 if (storage_needed
> 0)
1487 asymbol
**symbol_table
= (asymbol
**) xmalloc (storage_needed
);
1488 struct cleanup
*back_to
= make_cleanup (xfree
, symbol_table
);
1489 unsigned int number_of_symbols
=
1490 bfd_canonicalize_symtab (abfd
, symbol_table
);
1492 for (i
= 0; i
< number_of_symbols
; i
++)
1494 asymbol
*sym
= *symbol_table
++;
1496 if (match_sym (sym
, data
))
1498 struct gdbarch
*gdbarch
= target_gdbarch ();
1499 symaddr
= sym
->value
;
1501 /* Some ELF targets fiddle with addresses of symbols they
1502 consider special. They use minimal symbols to do that
1503 and this is needed for correct breakpoint placement,
1504 but we do not have full data here to build a complete
1505 minimal symbol, so just set the address and let the
1506 targets cope with that. */
1507 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1508 && gdbarch_elf_make_msymbol_special_p (gdbarch
))
1510 struct minimal_symbol msym
;
1512 memset (&msym
, 0, sizeof (msym
));
1513 SET_MSYMBOL_VALUE_ADDRESS (&msym
, symaddr
);
1514 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, &msym
);
1515 symaddr
= MSYMBOL_VALUE_RAW_ADDRESS (&msym
);
1518 /* BFD symbols are section relative. */
1519 symaddr
+= sym
->section
->vma
;
1523 do_cleanups (back_to
);
1529 /* Lookup the value for a specific symbol from symbol table. Look up symbol
1530 from ABFD. MATCH_SYM is a callback function to determine whether to pick
1531 up a symbol. DATA is the input of this callback function. Return NULL
1532 if symbol is not found. */
1535 bfd_lookup_symbol_from_dyn_symtab (bfd
*abfd
,
1536 int (*match_sym
) (const asymbol
*,
1540 long storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
1541 CORE_ADDR symaddr
= 0;
1543 if (storage_needed
> 0)
1546 asymbol
**symbol_table
= (asymbol
**) xmalloc (storage_needed
);
1547 struct cleanup
*back_to
= make_cleanup (xfree
, symbol_table
);
1548 unsigned int number_of_symbols
=
1549 bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
1551 for (i
= 0; i
< number_of_symbols
; i
++)
1553 asymbol
*sym
= *symbol_table
++;
1555 if (match_sym (sym
, data
))
1557 /* BFD symbols are section relative. */
1558 symaddr
= sym
->value
+ sym
->section
->vma
;
1562 do_cleanups (back_to
);
1567 /* Lookup the value for a specific symbol from symbol table and dynamic
1568 symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
1569 function to determine whether to pick up a symbol. DATA is the
1570 input of this callback function. Return NULL if symbol is not
1574 gdb_bfd_lookup_symbol (bfd
*abfd
,
1575 int (*match_sym
) (const asymbol
*, const void *),
1578 CORE_ADDR symaddr
= gdb_bfd_lookup_symbol_from_symtab (abfd
, match_sym
, data
);
1580 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
1581 have to check the dynamic string table too. */
1583 symaddr
= bfd_lookup_symbol_from_dyn_symtab (abfd
, match_sym
, data
);
1588 /* SO_LIST_HEAD may contain user-loaded object files that can be removed
1589 out-of-band by the user. So upon notification of free_objfile remove
1590 all references to any user-loaded file that is about to be freed. */
1593 remove_user_added_objfile (struct objfile
*objfile
)
1597 if (objfile
!= 0 && objfile
->flags
& OBJF_USERLOADED
)
1599 for (so
= so_list_head
; so
!= NULL
; so
= so
->next
)
1600 if (so
->objfile
== objfile
)
1606 _initialize_solib (void)
1608 solib_data
= gdbarch_data_register_pre_init (solib_init
);
1610 observer_attach_free_objfile (remove_user_added_objfile
);
1612 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1613 _("Load shared object library symbols for files matching REGEXP."));
1614 add_info ("sharedlibrary", info_sharedlibrary_command
,
1615 _("Status of loaded shared object libraries."));
1616 add_info_alias ("dll", "sharedlibrary", 1);
1617 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1618 _("Unload all shared object library symbols."));
1620 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1621 &auto_solib_add
, _("\
1622 Set autoloading of shared library symbols."), _("\
1623 Show autoloading of shared library symbols."), _("\
1624 If \"on\", symbols from all shared object libraries will be loaded\n\
1625 automatically when the inferior begins execution, when the dynamic linker\n\
1626 informs gdb that a new library has been loaded, or when attaching to the\n\
1627 inferior. Otherwise, symbols must be loaded manually, using \
1630 show_auto_solib_add
,
1631 &setlist
, &showlist
);
1633 add_setshow_optional_filename_cmd ("sysroot", class_support
,
1635 Set an alternate system root."), _("\
1636 Show the current system root."), _("\
1637 The system root is used to load absolute shared library symbol files.\n\
1638 For other (relative) files, you can add directories using\n\
1639 `set solib-search-path'."),
1640 gdb_sysroot_changed
,
1642 &setlist
, &showlist
);
1644 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1646 add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support
, 0,
1649 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1650 &solib_search_path
, _("\
1651 Set the search path for loading non-absolute shared library symbol files."),
1653 Show the search path for loading non-absolute shared library symbol files."),
1655 This takes precedence over the environment variables \
1656 PATH and LD_LIBRARY_PATH."),
1657 reload_shared_libraries
,
1658 show_solib_search_path
,
1659 &setlist
, &showlist
);