1 /* Handle shared libraries for GDB, the GNU Debugger.
3 Copyright (C) 1990-2021 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"
34 #include "gdbsupport/environ.h"
37 #include "completer.h"
38 #include "elf/external.h"
39 #include "elf/common.h"
40 #include "filenames.h" /* for DOSish file names */
43 #include "observable.h"
44 #include "readline/tilde.h"
48 #include "filesystem.h"
50 #include "gdbsupport/filestuff.h"
52 #include "cli/cli-style.h"
54 /* Architecture-specific operations. */
56 /* Per-architecture data key. */
57 static struct gdbarch_data
*solib_data
;
60 solib_init (struct obstack
*obstack
)
62 struct target_so_ops
**ops
;
64 ops
= OBSTACK_ZALLOC (obstack
, struct target_so_ops
*);
65 *ops
= current_target_so_ops
;
69 static const struct target_so_ops
*
70 solib_ops (struct gdbarch
*gdbarch
)
72 const struct target_so_ops
**ops
73 = (const struct target_so_ops
**) gdbarch_data (gdbarch
, solib_data
);
78 /* Set the solib operations for GDBARCH to NEW_OPS. */
81 set_solib_ops (struct gdbarch
*gdbarch
, const struct target_so_ops
*new_ops
)
83 const struct target_so_ops
**ops
84 = (const struct target_so_ops
**) gdbarch_data (gdbarch
, solib_data
);
90 /* external data declarations */
92 /* FIXME: gdbarch needs to control this variable, or else every
93 configuration needs to call set_solib_ops. */
94 struct target_so_ops
*current_target_so_ops
;
96 /* Local function prototypes */
98 /* If non-empty, this is a search path for loading non-absolute shared library
99 symbol files. This takes precedence over the environment variables PATH
100 and LD_LIBRARY_PATH. */
101 static std::string solib_search_path
;
103 show_solib_search_path (struct ui_file
*file
, int from_tty
,
104 struct cmd_list_element
*c
, const char *value
)
106 fprintf_filtered (file
, _("The search path for loading non-absolute "
107 "shared library symbol files is %s.\n"),
111 /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
112 #if (HAVE_DOS_BASED_FILE_SYSTEM)
113 # define DOS_BASED_FILE_SYSTEM 1
115 # define DOS_BASED_FILE_SYSTEM 0
118 /* Return the full pathname of a binary file (the main executable or a
119 shared library file), or NULL if not found. If FD is non-NULL, *FD
120 is set to either -1 or an open file handle for the binary file.
122 Global variable GDB_SYSROOT is used as a prefix directory
123 to search for binary files if they have an absolute path.
124 If GDB_SYSROOT starts with "target:" and target filesystem
125 is the local filesystem then the "target:" prefix will be
126 stripped before the search starts. This ensures that the
127 same search algorithm is used for local files regardless of
128 whether a "target:" prefix was used.
130 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
131 (or set of directories, as in LD_LIBRARY_PATH) to search for all
132 shared libraries if not found in either the sysroot (if set) or
133 the local filesystem. SOLIB_SEARCH_PATH is not used when searching
134 for the main executable.
137 * If a sysroot is set and path is absolute:
138 * Search for sysroot/path.
140 * Look for it literally (unmodified).
141 * If IS_SOLIB is non-zero:
142 * Look in SOLIB_SEARCH_PATH.
143 * If available, use target defined search function.
144 * If NO sysroot is set, perform the following two searches:
145 * Look in inferior's $PATH.
146 * If IS_SOLIB is non-zero:
147 * Look in inferior's $LD_LIBRARY_PATH.
149 * The last check avoids doing this search when targeting remote
150 * machines since a sysroot will almost always be set.
153 static gdb::unique_xmalloc_ptr
<char>
154 solib_find_1 (const char *in_pathname
, int *fd
, bool is_solib
)
156 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
158 gdb::unique_xmalloc_ptr
<char> temp_pathname
;
159 const char *fskind
= effective_target_file_system_kind ();
160 const char *sysroot
= gdb_sysroot
.c_str ();
161 int prefix_len
, orig_prefix_len
;
163 /* If the absolute prefix starts with "target:" but the filesystem
164 accessed by the target_fileio_* methods is the local filesystem
165 then we strip the "target:" prefix now and work with the local
166 filesystem. This ensures that the same search algorithm is used
167 for all local files regardless of whether a "target:" prefix was
169 if (is_target_filename (sysroot
) && target_filesystem_is_local ())
170 sysroot
+= strlen (TARGET_SYSROOT_PREFIX
);
172 /* Strip any trailing slashes from the absolute prefix. */
173 prefix_len
= orig_prefix_len
= strlen (sysroot
);
175 while (prefix_len
> 0 && IS_DIR_SEPARATOR (sysroot
[prefix_len
- 1]))
178 std::string sysroot_holder
;
181 else if (prefix_len
!= orig_prefix_len
)
183 sysroot_holder
= std::string (sysroot
, prefix_len
);
184 sysroot
= sysroot_holder
.c_str ();
187 /* If we're on a non-DOS-based system, backslashes won't be
188 understood as directory separator, so, convert them to forward
189 slashes, iff we're supposed to handle DOS-based file system
190 semantics for target paths. */
191 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
195 /* Avoid clobbering our input. */
196 p
= (char *) alloca (strlen (in_pathname
) + 1);
197 strcpy (p
, in_pathname
);
207 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
208 IS_ABSOLUTE_PATH. The latter is for host paths only, while
209 IN_PATHNAME is a target path. For example, if we're supposed to
210 be handling DOS-like semantics we want to consider a
211 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
212 With such a path, before giving up on the sysroot, we'll try:
214 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
215 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
216 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
219 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || sysroot
== NULL
)
220 temp_pathname
.reset (xstrdup (in_pathname
));
223 bool need_dir_separator
;
225 /* Concatenate the sysroot and the target reported filename. We
226 may need to glue them with a directory separator. Cases to
229 | sysroot | separator | in_pathname |
230 |-----------------+-----------+----------------|
231 | /some/dir | / | c:/foo/bar.dll |
232 | /some/dir | | /foo/bar.dll |
233 | target: | | c:/foo/bar.dll |
234 | target: | | /foo/bar.dll |
235 | target:some/dir | / | c:/foo/bar.dll |
236 | target:some/dir | | /foo/bar.dll |
238 IOW, we don't need to add a separator if IN_PATHNAME already
239 has one, or when the sysroot is exactly "target:".
240 There's no need to check for drive spec explicitly, as we only
241 get here if IN_PATHNAME is considered an absolute path. */
242 need_dir_separator
= !(IS_DIR_SEPARATOR (in_pathname
[0])
243 || strcmp (TARGET_SYSROOT_PREFIX
, sysroot
) == 0);
245 /* Cat the prefixed pathname together. */
246 temp_pathname
.reset (concat (sysroot
,
247 need_dir_separator
? SLASH_STRING
: "",
248 in_pathname
, (char *) NULL
));
251 /* Handle files to be accessed via the target. */
252 if (is_target_filename (temp_pathname
.get ()))
256 return temp_pathname
;
259 /* Now see if we can open it. */
260 found_file
= gdb_open_cloexec (temp_pathname
.get (),
261 O_RDONLY
| O_BINARY
, 0).release ();
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 bool need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
273 char drive
[2] = { in_pathname
[0], '\0' };
275 temp_pathname
.reset (concat (sysroot
,
278 need_dir_separator
? SLASH_STRING
: "",
279 in_pathname
+ 2, (char *) NULL
));
281 found_file
= gdb_open_cloexec (temp_pathname
.get (),
282 O_RDONLY
| O_BINARY
, 0).release ();
285 /* If the search in gdb_sysroot still failed, try fully
286 stripping the drive spec, and trying once more in the
287 sysroot before giving up.
289 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
291 temp_pathname
.reset (concat (sysroot
,
292 need_dir_separator
? SLASH_STRING
: "",
293 in_pathname
+ 2, (char *) NULL
));
295 found_file
= gdb_open_cloexec (temp_pathname
.get (),
296 O_RDONLY
| O_BINARY
, 0).release ();
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
.reset (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
.empty ())
326 found_file
= openp (solib_search_path
.c_str (),
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
.empty ())
335 found_file
= openp (solib_search_path
.c_str (),
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 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
.empty () && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
386 result
= solib_find_1 (in_pathname
, fd
, false);
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
, false);
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 if (!source_full_path_of (in_pathname
, &result
))
410 result
.reset (xstrdup (in_pathname
));
418 /* Return the full pathname of a shared library file, or NULL if not
419 found. If FD is non-NULL, *FD is set to either -1 or an open file
420 handle for the shared library.
422 The search algorithm used is described in solib_find_1's comment
425 gdb::unique_xmalloc_ptr
<char>
426 solib_find (const char *in_pathname
, int *fd
)
428 const char *solib_symbols_extension
429 = gdbarch_solib_symbols_extension (target_gdbarch ());
431 /* If solib_symbols_extension is set, replace the file's
433 if (solib_symbols_extension
!= NULL
)
435 const char *p
= in_pathname
+ strlen (in_pathname
);
437 while (p
> in_pathname
&& *p
!= '.')
445 = (char *) alloca (p
- in_pathname
+ 1
446 + strlen (solib_symbols_extension
) + 1);
447 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
448 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
449 solib_symbols_extension
);
451 in_pathname
= new_pathname
;
455 return solib_find_1 (in_pathname
, fd
, true);
458 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
459 it is used as file handle to open the file. Throws an error if the file
460 could not be opened. Handles both local and remote file access.
462 If unsuccessful, the FD will be closed (unless FD was -1). */
465 solib_bfd_fopen (const char *pathname
, int fd
)
467 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (pathname
, gnutarget
, fd
));
469 if (abfd
!= NULL
&& !gdb_bfd_has_target_filename (abfd
.get ()))
470 bfd_set_cacheable (abfd
.get (), 1);
474 /* Arrange to free PATHNAME when the error is thrown. */
475 error (_("Could not open `%s' as an executable file: %s"),
476 pathname
, bfd_errmsg (bfd_get_error ()));
482 /* Find shared library PATHNAME and open a BFD for it. */
485 solib_bfd_open (const char *pathname
)
488 const struct bfd_arch_info
*b
;
490 /* Search for shared library file. */
491 gdb::unique_xmalloc_ptr
<char> found_pathname
492 = solib_find (pathname
, &found_file
);
493 if (found_pathname
== NULL
)
495 /* Return failure if the file could not be found, so that we can
496 accumulate messages about missing libraries. */
500 perror_with_name (pathname
);
503 /* Open bfd for shared library. */
504 gdb_bfd_ref_ptr
abfd (solib_bfd_fopen (found_pathname
.get (), found_file
));
506 /* Check bfd format. */
507 if (!bfd_check_format (abfd
.get (), bfd_object
))
508 error (_("`%s': not in executable format: %s"),
509 bfd_get_filename (abfd
.get ()), bfd_errmsg (bfd_get_error ()));
511 /* Check bfd arch. */
512 b
= gdbarch_bfd_arch_info (target_gdbarch ());
513 if (!b
->compatible (b
, bfd_get_arch_info (abfd
.get ())))
514 warning (_("`%s': Shared library architecture %s is not compatible "
515 "with target architecture %s."), bfd_get_filename (abfd
.get ()),
516 bfd_get_arch_info (abfd
.get ())->printable_name
,
522 /* Given a pointer to one of the shared objects in our list of mapped
523 objects, use the recorded name to open a bfd descriptor for the
524 object, build a section table, relocate all the section addresses
525 by the base address at which the shared object was mapped, and then
526 add the sections to the target's section table.
528 FIXME: In most (all?) cases the shared object file name recorded in
529 the dynamic linkage tables will be a fully qualified pathname. For
530 cases where it isn't, do we really mimic the systems search
531 mechanism correctly in the below code (particularly the tilde
532 expansion stuff?). */
535 solib_map_sections (struct so_list
*so
)
537 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
539 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (so
->so_name
));
540 gdb_bfd_ref_ptr
abfd (ops
->bfd_open (filename
.get ()));
545 /* Leave bfd open, core_xfer_memory and "info files" need it. */
546 so
->abfd
= abfd
.release ();
548 /* Copy the full path name into so_name, allowing symbol_file_add
549 to find it later. This also affects the =library-loaded GDB/MI
550 event, and in particular the part of that notification providing
551 the library's host-side path. If we let the target dictate
552 that objfile's path, and the target is different from the host,
553 GDB/MI will not provide the correct host-side path. */
554 if (strlen (bfd_get_filename (so
->abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
555 error (_("Shared library file name is too long."));
556 strcpy (so
->so_name
, bfd_get_filename (so
->abfd
));
558 if (so
->sections
== nullptr)
559 so
->sections
= new target_section_table
;
560 *so
->sections
= build_section_table (so
->abfd
);
562 for (target_section
&p
: *so
->sections
)
564 /* Relocate the section binding addresses as recorded in the shared
565 object's file by the base address to which the object was actually
567 ops
->relocate_section_addresses (so
, &p
);
569 /* If the target didn't provide information about the address
570 range of the shared object, assume we want the location of
571 the .text section. */
572 if (so
->addr_low
== 0 && so
->addr_high
== 0
573 && strcmp (p
.the_bfd_section
->name
, ".text") == 0)
575 so
->addr_low
= p
.addr
;
576 so
->addr_high
= p
.endaddr
;
580 /* Add the shared object's sections to the current set of file
581 section tables. Do this immediately after mapping the object so
582 that later nodes in the list can query this object, as is needed
584 current_program_space
->add_target_sections (so
, *so
->sections
);
589 /* Free symbol-file related contents of SO and reset for possible reloading
590 of SO. If we have opened a BFD for SO, close it. If we have placed SO's
591 sections in some target's section table, the caller is responsible for
594 This function doesn't mess with objfiles at all. If there is an
595 objfile associated with SO that needs to be removed, the caller is
596 responsible for taking care of that. */
599 clear_so (struct so_list
*so
)
601 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
606 gdb_bfd_unref (so
->abfd
);
609 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
610 so
->symbols_loaded
= 0;
613 so
->addr_low
= so
->addr_high
= 0;
615 /* Restore the target-supplied file name. SO_NAME may be the path
616 of the symbol file. */
617 strcpy (so
->so_name
, so
->so_original_name
);
619 /* Do the same for target-specific data. */
620 if (ops
->clear_so
!= NULL
)
624 /* Free the storage associated with the `struct so_list' object SO.
625 If we have opened a BFD for SO, close it.
627 The caller is responsible for removing SO from whatever list it is
628 a member of. If we have placed SO's sections in some target's
629 section table, the caller is responsible for removing them.
631 This function doesn't mess with objfiles at all. If there is an
632 objfile associated with SO that needs to be removed, the caller is
633 responsible for taking care of that. */
636 free_so (struct so_list
*so
)
638 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
647 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
648 be chatty about it. Return true if any symbols were actually loaded. */
651 solib_read_symbols (struct so_list
*so
, symfile_add_flags flags
)
653 if (so
->symbols_loaded
)
655 /* If needed, we've already warned in our caller. */
657 else if (so
->abfd
== NULL
)
659 /* We've already warned about this library, when trying to open
665 flags
|= current_inferior ()->symfile_flags
;
669 /* Have we already loaded this shared object? */
670 so
->objfile
= nullptr;
671 for (objfile
*objfile
: current_program_space
->objfiles ())
673 if (filename_cmp (objfile_name (objfile
), so
->so_name
) == 0
674 && objfile
->addr_low
== so
->addr_low
)
676 so
->objfile
= objfile
;
680 if (so
->objfile
== NULL
)
682 section_addr_info sap
683 = build_section_addr_info_from_section_table (*so
->sections
);
684 so
->objfile
= symbol_file_add_from_bfd (so
->abfd
, so
->so_name
,
687 so
->objfile
->addr_low
= so
->addr_low
;
690 so
->symbols_loaded
= 1;
692 catch (const gdb_exception_error
&e
)
694 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
695 " library symbols for %s:\n"),
705 /* Return true if KNOWN->objfile is used by any other so_list object
706 in the list of shared libraries. Return false otherwise. */
709 solib_used (const struct so_list
*const known
)
711 for (const struct so_list
*pivot
: current_program_space
->solibs ())
712 if (pivot
!= known
&& pivot
->objfile
== known
->objfile
)
720 update_solib_list (int from_tty
)
722 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
723 struct so_list
*inferior
= ops
->current_sos();
724 struct so_list
*gdb
, **gdb_link
;
726 /* We can reach here due to changing solib-search-path or the
727 sysroot, before having any inferior. */
728 if (target_has_execution () && inferior_ptid
!= null_ptid
)
730 struct inferior
*inf
= current_inferior ();
732 /* If we are attaching to a running process for which we
733 have not opened a symbol file, we may be able to get its
736 && current_program_space
->symfile_object_file
== NULL
)
740 ops
->open_symbol_file_object (from_tty
);
742 catch (const gdb_exception
&ex
)
744 exception_fprintf (gdb_stderr
, ex
,
745 "Error reading attached "
746 "process's symbol file.\n");
751 /* GDB and the inferior's dynamic linker each maintain their own
752 list of currently loaded shared objects; we want to bring the
753 former in sync with the latter. Scan both lists, seeing which
754 shared objects appear where. There are three cases:
756 - A shared object appears on both lists. This means that GDB
757 knows about it already, and it's still loaded in the inferior.
758 Nothing needs to happen.
760 - A shared object appears only on GDB's list. This means that
761 the inferior has unloaded it. We should remove the shared
762 object from GDB's tables.
764 - A shared object appears only on the inferior's list. This
765 means that it's just been loaded. We should add it to GDB's
768 So we walk GDB's list, checking each entry to see if it appears
769 in the inferior's list too. If it does, no action is needed, and
770 we remove it from the inferior's list. If it doesn't, the
771 inferior has unloaded it, and we remove it from GDB's list. By
772 the time we're done walking GDB's list, the inferior's list
773 contains only the new shared objects, which we then add. */
775 gdb
= current_program_space
->so_list
;
776 gdb_link
= ¤t_program_space
->so_list
;
779 struct so_list
*i
= inferior
;
780 struct so_list
**i_link
= &inferior
;
782 /* Check to see whether the shared object *gdb also appears in
783 the inferior's current list. */
788 if (ops
->same (gdb
, i
))
793 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
801 /* If the shared object appears on the inferior's list too, then
802 it's still loaded, so we don't need to do anything. Delete
803 it from the inferior's list, and leave it on GDB's list. */
808 gdb_link
= &gdb
->next
;
812 /* If it's not on the inferior's list, remove it from GDB's tables. */
815 /* Notify any observer that the shared object has been
816 unloaded before we remove it from GDB's tables. */
817 gdb::observers::solib_unloaded
.notify (gdb
);
819 current_program_space
->deleted_solibs
.push_back (gdb
->so_name
);
821 *gdb_link
= gdb
->next
;
823 /* Unless the user loaded it explicitly, free SO's objfile. */
824 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
)
825 && !solib_used (gdb
))
826 gdb
->objfile
->unlink ();
828 /* Some targets' section tables might be referring to
829 sections from so->abfd; remove them. */
830 current_program_space
->remove_target_sections (gdb
);
837 /* Now the inferior's list contains only shared objects that don't
838 appear in GDB's list --- those that are newly loaded. Add them
839 to GDB's shared object list. */
843 const char *not_found_filename
= NULL
;
847 /* Add the new shared objects to GDB's list. */
848 *gdb_link
= inferior
;
850 /* Fill in the rest of each of the `struct so_list' nodes. */
851 for (i
= inferior
; i
; i
= i
->next
)
854 i
->pspace
= current_program_space
;
855 current_program_space
->added_solibs
.push_back (i
);
859 /* Fill in the rest of the `struct so_list' node. */
860 if (!solib_map_sections (i
))
863 if (not_found_filename
== NULL
)
864 not_found_filename
= i
->so_original_name
;
868 catch (const gdb_exception_error
&e
)
870 exception_fprintf (gdb_stderr
, e
,
871 _("Error while mapping shared "
872 "library sections:\n"));
875 /* Notify any observer that the shared object has been
876 loaded now that we've added it to GDB's tables. */
877 gdb::observers::solib_loaded
.notify (i
);
880 /* If a library was not found, issue an appropriate warning
881 message. We have to use a single call to warning in case the
882 front end does something special with warnings, e.g., pop up
883 a dialog box. It Would Be Nice if we could get a "warning: "
884 prefix on each line in the CLI front end, though - it doesn't
888 warning (_("Could not load shared library symbols for %s.\n"
889 "Do you need \"set solib-search-path\" "
890 "or \"set sysroot\"?"),
892 else if (not_found
> 1)
894 Could not load shared library symbols for %d libraries, e.g. %s.\n\
895 Use the \"info sharedlibrary\" command to see the complete listing.\n\
896 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
897 not_found
, not_found_filename
);
902 /* Return non-zero if NAME is the libpthread shared library.
904 Uses a fairly simplistic heuristic approach where we check
905 the file name against "/libpthread". This can lead to false
906 positives, but this should be good enough in practice.
908 As of glibc-2.34, functions formerly residing in libpthread have
909 been moved to libc, so "/libc." needs to be checked too. (Matching
910 the "." will avoid matching libraries such as libcrypt.) */
913 libpthread_name_p (const char *name
)
915 return (strstr (name
, "/libpthread") != NULL
916 || strstr (name
, "/libc.") != NULL
);
919 /* Return non-zero if SO is the libpthread shared library. */
922 libpthread_solib_p (struct so_list
*so
)
924 return libpthread_name_p (so
->so_name
);
927 /* Read in symbolic information for any shared objects whose names
928 match PATTERN. (If we've already read a shared object's symbol
929 info, leave it alone.) If PATTERN is zero, read them all.
931 If READSYMS is 0, defer reading symbolic information until later
932 but still do any needed low level processing.
934 FROM_TTY is described for update_solib_list, above. */
937 solib_add (const char *pattern
, int from_tty
, int readsyms
)
939 if (print_symbol_loading_p (from_tty
, 0, 0))
943 printf_unfiltered (_("Loading symbols for shared libraries: %s\n"),
947 printf_unfiltered (_("Loading symbols for shared libraries.\n"));
950 current_program_space
->solib_add_generation
++;
954 char *re_err
= re_comp (pattern
);
957 error (_("Invalid regexp: %s"), re_err
);
960 update_solib_list (from_tty
);
962 /* Walk the list of currently loaded shared libraries, and read
963 symbols for any that match the pattern --- or any whose symbols
964 aren't already loaded, if no pattern was given. */
966 bool any_matches
= false;
967 bool loaded_any_symbols
= false;
968 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
971 add_flags
|= SYMFILE_VERBOSE
;
973 for (struct so_list
*gdb
: current_program_space
->solibs ())
974 if (! pattern
|| re_exec (gdb
->so_name
))
976 /* Normally, we would read the symbols from that library
977 only if READSYMS is set. However, we're making a small
978 exception for the pthread library, because we sometimes
979 need the library symbols to be loaded in order to provide
980 thread support (x86-linux for instance). */
981 const int add_this_solib
=
982 (readsyms
|| libpthread_solib_p (gdb
));
987 if (gdb
->symbols_loaded
)
989 /* If no pattern was given, be quiet for shared
990 libraries we have already loaded. */
991 if (pattern
&& (from_tty
|| info_verbose
))
992 printf_unfiltered (_("Symbols already loaded for %s\n"),
995 else if (solib_read_symbols (gdb
, add_flags
))
996 loaded_any_symbols
= true;
1000 if (loaded_any_symbols
)
1001 breakpoint_re_set ();
1003 if (from_tty
&& pattern
&& ! any_matches
)
1005 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
1007 if (loaded_any_symbols
)
1009 /* Getting new symbols may change our opinion about what is
1011 reinit_frame_cache ();
1016 /* Implement the "info sharedlibrary" command. Walk through the
1017 shared library list and print information about each attached
1018 library matching PATTERN. If PATTERN is elided, print them
1022 info_sharedlibrary_command (const char *pattern
, int from_tty
)
1024 bool so_missing_debug_info
= false;
1027 struct gdbarch
*gdbarch
= target_gdbarch ();
1028 struct ui_out
*uiout
= current_uiout
;
1032 char *re_err
= re_comp (pattern
);
1035 error (_("Invalid regexp: %s"), re_err
);
1038 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1039 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1041 update_solib_list (from_tty
);
1043 /* ui_out_emit_table table_emitter needs to know the number of rows,
1044 so we need to make two passes over the libs. */
1047 for (struct so_list
*so
: current_program_space
->solibs ())
1051 if (pattern
&& ! re_exec (so
->so_name
))
1058 ui_out_emit_table
table_emitter (uiout
, 4, nr_libs
, "SharedLibraryTable");
1060 /* The "- 1" is because ui_out adds one space between columns. */
1061 uiout
->table_header (addr_width
- 1, ui_left
, "from", "From");
1062 uiout
->table_header (addr_width
- 1, ui_left
, "to", "To");
1063 uiout
->table_header (12 - 1, ui_left
, "syms-read", "Syms Read");
1064 uiout
->table_header (0, ui_noalign
, "name", "Shared Object Library");
1066 uiout
->table_body ();
1068 for (struct so_list
*so
: current_program_space
->solibs ())
1070 if (! so
->so_name
[0])
1072 if (pattern
&& ! re_exec (so
->so_name
))
1075 ui_out_emit_tuple
tuple_emitter (uiout
, "lib");
1077 if (so
->addr_high
!= 0)
1079 uiout
->field_core_addr ("from", gdbarch
, so
->addr_low
);
1080 uiout
->field_core_addr ("to", gdbarch
, so
->addr_high
);
1084 uiout
->field_skip ("from");
1085 uiout
->field_skip ("to");
1088 if (! top_level_interpreter ()->interp_ui_out ()->is_mi_like_p ()
1089 && so
->symbols_loaded
1090 && !objfile_has_symbols (so
->objfile
))
1092 so_missing_debug_info
= true;
1093 uiout
->field_string ("syms-read", "Yes (*)");
1096 uiout
->field_string ("syms-read", so
->symbols_loaded
? "Yes" : "No");
1098 uiout
->field_string ("name", so
->so_name
, file_name_style
.style ());
1107 uiout
->message (_("No shared libraries matched.\n"));
1109 uiout
->message (_("No shared libraries loaded at this time.\n"));
1113 if (so_missing_debug_info
)
1114 uiout
->message (_("(*): Shared library is missing "
1115 "debugging information.\n"));
1122 solib_contains_address_p (const struct so_list
*const solib
,
1125 if (solib
->sections
== nullptr)
1128 for (target_section
&p
: *solib
->sections
)
1129 if (p
.addr
<= address
&& address
< p
.endaddr
)
1135 /* If ADDRESS is in a shared lib in program space PSPACE, return its
1138 Provides a hook for other gdb routines to discover whether or not a
1139 particular address is within the mapped address space of a shared
1142 For example, this routine is called at one point to disable
1143 breakpoints which are in shared libraries that are not currently
1147 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1149 struct so_list
*so
= NULL
;
1151 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1152 if (solib_contains_address_p (so
, address
))
1153 return (so
->so_name
);
1161 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1163 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1165 if (ops
->keep_data_in_core
)
1166 return ops
->keep_data_in_core (vaddr
, size
) != 0;
1171 /* Called by free_all_symtabs */
1176 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1178 disable_breakpoints_in_shlibs ();
1180 while (current_program_space
->so_list
)
1182 struct so_list
*so
= current_program_space
->so_list
;
1184 current_program_space
->so_list
= so
->next
;
1185 gdb::observers::solib_unloaded
.notify (so
);
1186 current_program_space
->remove_target_sections (so
);
1190 ops
->clear_solib ();
1193 /* Shared library startup support. When GDB starts up the inferior,
1194 it nurses it along (through the shell) until it is ready to execute
1195 its first instruction. At this point, this function gets
1199 solib_create_inferior_hook (int from_tty
)
1201 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1203 ops
->solib_create_inferior_hook (from_tty
);
1209 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1211 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1213 return ops
->in_dynsym_resolve_code (pc
) != 0;
1216 /* Implements the "sharedlibrary" command. */
1219 sharedlibrary_command (const char *args
, int from_tty
)
1222 solib_add (args
, from_tty
, 1);
1225 /* Implements the command "nosharedlibrary", which discards symbols
1226 that have been auto-loaded from shared libraries. Symbols from
1227 shared libraries that were added by explicit request of the user
1228 are not discarded. Also called from remote.c. */
1231 no_shared_libraries (const char *ignored
, int from_tty
)
1233 /* The order of the two routines below is important: clear_solib notifies
1234 the solib_unloaded observers, and some of these observers might need
1235 access to their associated objfiles. Therefore, we can not purge the
1236 solibs' objfiles before clear_solib has been called. */
1239 objfile_purge_solibs ();
1245 update_solib_breakpoints (void)
1247 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1249 if (ops
->update_breakpoints
!= NULL
)
1250 ops
->update_breakpoints ();
1256 handle_solib_event (void)
1258 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1260 if (ops
->handle_event
!= NULL
)
1261 ops
->handle_event ();
1263 current_inferior ()->pspace
->clear_solib_cache ();
1265 /* Check for any newly added shared libraries if we're supposed to
1266 be adding them automatically. Switch terminal for any messages
1267 produced by breakpoint_re_set. */
1268 target_terminal::ours_for_output ();
1269 solib_add (NULL
, 0, auto_solib_add
);
1270 target_terminal::inferior ();
1273 /* Reload shared libraries, but avoid reloading the same symbol file
1274 we already have loaded. */
1277 reload_shared_libraries_1 (int from_tty
)
1279 if (print_symbol_loading_p (from_tty
, 0, 0))
1280 printf_unfiltered (_("Loading symbols for shared libraries.\n"));
1282 for (struct so_list
*so
: current_program_space
->solibs ())
1284 const char *found_pathname
= NULL
;
1285 bool was_loaded
= so
->symbols_loaded
!= 0;
1286 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1289 add_flags
|= SYMFILE_VERBOSE
;
1291 gdb::unique_xmalloc_ptr
<char> filename
1292 (tilde_expand (so
->so_original_name
));
1293 gdb_bfd_ref_ptr
abfd (solib_bfd_open (filename
.get ()));
1295 found_pathname
= bfd_get_filename (abfd
.get ());
1297 /* If this shared library is no longer associated with its previous
1298 symbol file, close that. */
1299 if ((found_pathname
== NULL
&& was_loaded
)
1300 || (found_pathname
!= NULL
1301 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1303 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
)
1304 && !solib_used (so
))
1305 so
->objfile
->unlink ();
1306 current_program_space
->remove_target_sections (so
);
1310 /* If this shared library is now associated with a new symbol
1312 if (found_pathname
!= NULL
1314 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1316 bool got_error
= false;
1320 solib_map_sections (so
);
1323 catch (const gdb_exception_error
&e
)
1325 exception_fprintf (gdb_stderr
, e
,
1326 _("Error while mapping "
1327 "shared library sections:\n"));
1332 && (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
)))
1333 solib_read_symbols (so
, add_flags
);
1339 reload_shared_libraries (const char *ignored
, int from_tty
,
1340 struct cmd_list_element
*e
)
1342 const struct target_so_ops
*ops
;
1344 reload_shared_libraries_1 (from_tty
);
1346 ops
= solib_ops (target_gdbarch ());
1348 /* Creating inferior hooks here has two purposes. First, if we reload
1349 shared libraries then the address of solib breakpoint we've computed
1350 previously might be no longer valid. For example, if we forgot to set
1351 solib-absolute-prefix and are setting it right now, then the previous
1352 breakpoint address is plain wrong. Second, installing solib hooks
1353 also implicitly figures were ld.so is and loads symbols for it.
1354 Absent this call, if we've just connected to a target and set
1355 solib-absolute-prefix or solib-search-path, we'll lose all information
1357 if (target_has_execution ())
1359 /* Reset or free private data structures not associated with
1361 ops
->clear_solib ();
1363 /* Remove any previous solib event breakpoint. This is usually
1364 done in common code, at breakpoint_init_inferior time, but
1365 we're not really starting up the inferior here. */
1366 remove_solib_event_breakpoints ();
1368 solib_create_inferior_hook (from_tty
);
1371 /* Sometimes the platform-specific hook loads initial shared
1372 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1373 incorrectly 0 but such solib targets should be fixed anyway. If we
1374 made all the inferior hook methods consistent, this call could be
1375 removed. Call it only after the solib target has been initialized by
1376 solib_create_inferior_hook. */
1378 solib_add (NULL
, 0, auto_solib_add
);
1380 breakpoint_re_set ();
1382 /* We may have loaded or unloaded debug info for some (or all)
1383 shared libraries. However, frames may still reference them. For
1384 example, a frame's unwinder might still point at DWARF FDE
1385 structures that are now freed. Also, getting new symbols may
1386 change our opinion about what is frameless. */
1387 reinit_frame_cache ();
1390 /* Wrapper for reload_shared_libraries that replaces "remote:"
1391 at the start of gdb_sysroot with "target:". */
1394 gdb_sysroot_changed (const char *ignored
, int from_tty
,
1395 struct cmd_list_element
*e
)
1397 const char *old_prefix
= "remote:";
1398 const char *new_prefix
= TARGET_SYSROOT_PREFIX
;
1400 if (startswith (gdb_sysroot
.c_str (), old_prefix
))
1402 static bool warning_issued
= false;
1404 gdb_assert (strlen (old_prefix
) == strlen (new_prefix
));
1405 gdb_sysroot
= new_prefix
+ gdb_sysroot
.substr (strlen (old_prefix
));
1407 if (!warning_issued
)
1409 warning (_("\"%s\" is deprecated, use \"%s\" instead."),
1410 old_prefix
, new_prefix
);
1411 warning (_("sysroot set to \"%s\"."), gdb_sysroot
.c_str ());
1413 warning_issued
= true;
1417 reload_shared_libraries (ignored
, from_tty
, e
);
1421 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1422 struct cmd_list_element
*c
, const char *value
)
1424 fprintf_filtered (file
, _("Autoloading of shared library symbols is %s.\n"),
1429 /* Lookup the value for a specific symbol from dynamic symbol table. Look
1430 up symbol from ABFD. MATCH_SYM is a callback function to determine
1431 whether to pick up a symbol. DATA is the input of this callback
1432 function. Return NULL if symbol is not found. */
1435 gdb_bfd_lookup_symbol_from_symtab (bfd
*abfd
,
1436 int (*match_sym
) (const asymbol
*,
1440 long storage_needed
= bfd_get_symtab_upper_bound (abfd
);
1441 CORE_ADDR symaddr
= 0;
1443 if (storage_needed
> 0)
1447 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1448 asymbol
**symbol_table
= storage
.data ();
1449 unsigned int number_of_symbols
=
1450 bfd_canonicalize_symtab (abfd
, symbol_table
);
1452 for (i
= 0; i
< number_of_symbols
; i
++)
1454 asymbol
*sym
= *symbol_table
++;
1456 if (match_sym (sym
, data
))
1458 struct gdbarch
*gdbarch
= target_gdbarch ();
1459 symaddr
= sym
->value
;
1461 /* Some ELF targets fiddle with addresses of symbols they
1462 consider special. They use minimal symbols to do that
1463 and this is needed for correct breakpoint placement,
1464 but we do not have full data here to build a complete
1465 minimal symbol, so just set the address and let the
1466 targets cope with that. */
1467 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1468 && gdbarch_elf_make_msymbol_special_p (gdbarch
))
1470 struct minimal_symbol msym
{};
1472 SET_MSYMBOL_VALUE_ADDRESS (&msym
, symaddr
);
1473 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, &msym
);
1474 symaddr
= MSYMBOL_VALUE_RAW_ADDRESS (&msym
);
1477 /* BFD symbols are section relative. */
1478 symaddr
+= sym
->section
->vma
;
1490 gdb_bfd_scan_elf_dyntag (const int desired_dyntag
, bfd
*abfd
, CORE_ADDR
*ptr
,
1491 CORE_ADDR
*ptr_addr
)
1493 int arch_size
, step
, sect_size
;
1494 long current_dyntag
;
1495 CORE_ADDR dyn_ptr
, dyn_addr
;
1496 gdb_byte
*bufend
, *bufstart
, *buf
;
1497 Elf32_External_Dyn
*x_dynp_32
;
1498 Elf64_External_Dyn
*x_dynp_64
;
1499 struct bfd_section
*sect
;
1504 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
1507 arch_size
= bfd_get_arch_size (abfd
);
1508 if (arch_size
== -1)
1511 /* Find the start address of the .dynamic section. */
1512 sect
= bfd_get_section_by_name (abfd
, ".dynamic");
1517 for (const target_section
&target_section
1518 : current_program_space
->target_sections ())
1519 if (sect
== target_section
.the_bfd_section
)
1521 dyn_addr
= target_section
.addr
;
1527 /* ABFD may come from OBJFILE acting only as a symbol file without being
1528 loaded into the target (see add_symbol_file_command). This case is
1529 such fallback to the file VMA address without the possibility of
1530 having the section relocated to its actual in-memory address. */
1532 dyn_addr
= bfd_section_vma (sect
);
1535 /* Read in .dynamic from the BFD. We will get the actual value
1536 from memory later. */
1537 sect_size
= bfd_section_size (sect
);
1538 buf
= bufstart
= (gdb_byte
*) alloca (sect_size
);
1539 if (!bfd_get_section_contents (abfd
, sect
,
1543 /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
1544 step
= (arch_size
== 32) ? sizeof (Elf32_External_Dyn
)
1545 : sizeof (Elf64_External_Dyn
);
1546 for (bufend
= buf
+ sect_size
;
1550 if (arch_size
== 32)
1552 x_dynp_32
= (Elf32_External_Dyn
*) buf
;
1553 current_dyntag
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_tag
);
1554 dyn_ptr
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_un
.d_ptr
);
1558 x_dynp_64
= (Elf64_External_Dyn
*) buf
;
1559 current_dyntag
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_tag
);
1560 dyn_ptr
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_un
.d_ptr
);
1562 if (current_dyntag
== DT_NULL
)
1564 if (current_dyntag
== desired_dyntag
)
1566 /* If requested, try to read the runtime value of this .dynamic
1570 struct type
*ptr_type
;
1571 gdb_byte ptr_buf
[8];
1572 CORE_ADDR ptr_addr_1
;
1574 ptr_type
= builtin_type (target_gdbarch ())->builtin_data_ptr
;
1575 ptr_addr_1
= dyn_addr
+ (buf
- bufstart
) + arch_size
/ 8;
1576 if (target_read_memory (ptr_addr_1
, ptr_buf
, arch_size
/ 8) == 0)
1577 dyn_ptr
= extract_typed_address (ptr_buf
, ptr_type
);
1580 *ptr_addr
= dyn_addr
+ (buf
- bufstart
);
1589 /* Lookup the value for a specific symbol from symbol table. Look up symbol
1590 from ABFD. MATCH_SYM is a callback function to determine whether to pick
1591 up a symbol. DATA is the input of this callback function. Return NULL
1592 if symbol is not found. */
1595 bfd_lookup_symbol_from_dyn_symtab (bfd
*abfd
,
1596 int (*match_sym
) (const asymbol
*,
1600 long storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
1601 CORE_ADDR symaddr
= 0;
1603 if (storage_needed
> 0)
1606 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1607 asymbol
**symbol_table
= storage
.data ();
1608 unsigned int number_of_symbols
=
1609 bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
1611 for (i
= 0; i
< number_of_symbols
; i
++)
1613 asymbol
*sym
= *symbol_table
++;
1615 if (match_sym (sym
, data
))
1617 /* BFD symbols are section relative. */
1618 symaddr
= sym
->value
+ sym
->section
->vma
;
1626 /* Lookup the value for a specific symbol from symbol table and dynamic
1627 symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
1628 function to determine whether to pick up a symbol. DATA is the
1629 input of this callback function. Return NULL if symbol is not
1633 gdb_bfd_lookup_symbol (bfd
*abfd
,
1634 int (*match_sym
) (const asymbol
*, const void *),
1637 CORE_ADDR symaddr
= gdb_bfd_lookup_symbol_from_symtab (abfd
, match_sym
, data
);
1639 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
1640 have to check the dynamic string table too. */
1642 symaddr
= bfd_lookup_symbol_from_dyn_symtab (abfd
, match_sym
, data
);
1647 /* The shared library list may contain user-loaded object files that
1648 can be removed out-of-band by the user. So upon notification of
1649 free_objfile remove all references to any user-loaded file that is
1650 about to be freed. */
1653 remove_user_added_objfile (struct objfile
*objfile
)
1655 if (objfile
!= 0 && objfile
->flags
& OBJF_USERLOADED
)
1657 for (struct so_list
*so
: current_program_space
->solibs ())
1658 if (so
->objfile
== objfile
)
1663 void _initialize_solib ();
1665 _initialize_solib ()
1667 solib_data
= gdbarch_data_register_pre_init (solib_init
);
1669 gdb::observers::free_objfile
.attach (remove_user_added_objfile
,
1671 gdb::observers::inferior_execd
.attach ([] (inferior
*inf
)
1673 solib_create_inferior_hook (0);
1676 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1677 _("Load shared object library symbols for files matching REGEXP."));
1678 cmd_list_element
*info_sharedlibrary_cmd
1679 = add_info ("sharedlibrary", info_sharedlibrary_command
,
1680 _("Status of loaded shared object libraries."));
1681 add_info_alias ("dll", info_sharedlibrary_cmd
, 1);
1682 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1683 _("Unload all shared object library symbols."));
1685 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1686 &auto_solib_add
, _("\
1687 Set autoloading of shared library symbols."), _("\
1688 Show autoloading of shared library symbols."), _("\
1689 If \"on\", symbols from all shared object libraries will be loaded\n\
1690 automatically when the inferior begins execution, when the dynamic linker\n\
1691 informs gdb that a new library has been loaded, or when attaching to the\n\
1692 inferior. Otherwise, symbols must be loaded manually, using \
1695 show_auto_solib_add
,
1696 &setlist
, &showlist
);
1698 set_show_commands sysroot_cmds
1699 = add_setshow_optional_filename_cmd ("sysroot", class_support
,
1701 Set an alternate system root."), _("\
1702 Show the current system root."), _("\
1703 The system root is used to load absolute shared library symbol files.\n\
1704 For other (relative) files, you can add directories using\n\
1705 `set solib-search-path'."),
1706 gdb_sysroot_changed
,
1708 &setlist
, &showlist
);
1710 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.set
, class_support
, 0,
1712 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.show
, class_support
, 0,
1715 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1716 &solib_search_path
, _("\
1717 Set the search path for loading non-absolute shared library symbol files."),
1719 Show the search path for loading non-absolute shared library symbol files."),
1721 This takes precedence over the environment variables \
1722 PATH and LD_LIBRARY_PATH."),
1723 reload_shared_libraries
,
1724 show_solib_search_path
,
1725 &setlist
, &showlist
);