1 /* Handle shared libraries for GDB, the GNU Debugger.
3 Copyright (C) 1990-2022 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>
33 #include "gdbsupport/gdb_regex.h"
35 #include "gdbsupport/environ.h"
38 #include "completer.h"
39 #include "elf/external.h"
40 #include "elf/common.h"
41 #include "filenames.h" /* for DOSish file names */
44 #include "observable.h"
45 #include "readline/tilde.h"
49 #include "filesystem.h"
51 #include "gdbsupport/filestuff.h"
53 #include "cli/cli-style.h"
55 /* Architecture-specific operations. */
57 /* Per-architecture data key. */
58 static struct gdbarch_data
*solib_data
;
61 solib_init (struct obstack
*obstack
)
63 struct target_so_ops
**ops
;
65 ops
= OBSTACK_ZALLOC (obstack
, struct target_so_ops
*);
66 *ops
= current_target_so_ops
;
70 static const struct target_so_ops
*
71 solib_ops (struct gdbarch
*gdbarch
)
73 const struct target_so_ops
**ops
74 = (const struct target_so_ops
**) gdbarch_data (gdbarch
, solib_data
);
79 /* Set the solib operations for GDBARCH to NEW_OPS. */
82 set_solib_ops (struct gdbarch
*gdbarch
, const struct target_so_ops
*new_ops
)
84 const struct target_so_ops
**ops
85 = (const struct target_so_ops
**) gdbarch_data (gdbarch
, solib_data
);
91 /* external data declarations */
93 /* FIXME: gdbarch needs to control this variable, or else every
94 configuration needs to call set_solib_ops. */
95 struct target_so_ops
*current_target_so_ops
;
97 /* Local function prototypes */
99 /* If non-empty, this is a search path for loading non-absolute shared library
100 symbol files. This takes precedence over the environment variables PATH
101 and LD_LIBRARY_PATH. */
102 static std::string solib_search_path
;
104 show_solib_search_path (struct ui_file
*file
, int from_tty
,
105 struct cmd_list_element
*c
, const char *value
)
107 fprintf_filtered (file
, _("The search path for loading non-absolute "
108 "shared library symbol files is %s.\n"),
112 /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
113 #if (HAVE_DOS_BASED_FILE_SYSTEM)
114 # define DOS_BASED_FILE_SYSTEM 1
116 # define DOS_BASED_FILE_SYSTEM 0
119 /* Return the full pathname of a binary file (the main executable or a
120 shared library file), or NULL if not found. If FD is non-NULL, *FD
121 is set to either -1 or an open file handle for the binary file.
123 Global variable GDB_SYSROOT is used as a prefix directory
124 to search for binary files if they have an absolute path.
125 If GDB_SYSROOT starts with "target:" and target filesystem
126 is the local filesystem then the "target:" prefix will be
127 stripped before the search starts. This ensures that the
128 same search algorithm is used for local files regardless of
129 whether a "target:" prefix was used.
131 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
132 (or set of directories, as in LD_LIBRARY_PATH) to search for all
133 shared libraries if not found in either the sysroot (if set) or
134 the local filesystem. SOLIB_SEARCH_PATH is not used when searching
135 for the main executable.
138 * If a sysroot is set and path is absolute:
139 * Search for sysroot/path.
141 * Look for it literally (unmodified).
142 * If IS_SOLIB is non-zero:
143 * Look in SOLIB_SEARCH_PATH.
144 * If available, use target defined search function.
145 * If NO sysroot is set, perform the following two searches:
146 * Look in inferior's $PATH.
147 * If IS_SOLIB is non-zero:
148 * Look in inferior's $LD_LIBRARY_PATH.
150 * The last check avoids doing this search when targeting remote
151 * machines since a sysroot will almost always be set.
154 static gdb::unique_xmalloc_ptr
<char>
155 solib_find_1 (const char *in_pathname
, int *fd
, bool is_solib
)
157 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
159 gdb::unique_xmalloc_ptr
<char> temp_pathname
;
160 const char *fskind
= effective_target_file_system_kind ();
161 const char *sysroot
= gdb_sysroot
.c_str ();
162 int prefix_len
, orig_prefix_len
;
164 /* If the absolute prefix starts with "target:" but the filesystem
165 accessed by the target_fileio_* methods is the local filesystem
166 then we strip the "target:" prefix now and work with the local
167 filesystem. This ensures that the same search algorithm is used
168 for all local files regardless of whether a "target:" prefix was
170 if (is_target_filename (sysroot
) && target_filesystem_is_local ())
171 sysroot
+= strlen (TARGET_SYSROOT_PREFIX
);
173 /* Strip any trailing slashes from the absolute prefix. */
174 prefix_len
= orig_prefix_len
= strlen (sysroot
);
176 while (prefix_len
> 0 && IS_DIR_SEPARATOR (sysroot
[prefix_len
- 1]))
179 std::string sysroot_holder
;
182 else if (prefix_len
!= orig_prefix_len
)
184 sysroot_holder
= std::string (sysroot
, prefix_len
);
185 sysroot
= sysroot_holder
.c_str ();
188 /* If we're on a non-DOS-based system, backslashes won't be
189 understood as directory separator, so, convert them to forward
190 slashes, iff we're supposed to handle DOS-based file system
191 semantics for target paths. */
192 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
196 /* Avoid clobbering our input. */
197 p
= (char *) alloca (strlen (in_pathname
) + 1);
198 strcpy (p
, in_pathname
);
208 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
209 IS_ABSOLUTE_PATH. The latter is for host paths only, while
210 IN_PATHNAME is a target path. For example, if we're supposed to
211 be handling DOS-like semantics we want to consider a
212 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
213 With such a path, before giving up on the sysroot, we'll try:
215 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
216 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
217 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
220 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || sysroot
== NULL
)
221 temp_pathname
.reset (xstrdup (in_pathname
));
224 bool need_dir_separator
;
226 /* Concatenate the sysroot and the target reported filename. We
227 may need to glue them with a directory separator. Cases to
230 | sysroot | separator | in_pathname |
231 |-----------------+-----------+----------------|
232 | /some/dir | / | c:/foo/bar.dll |
233 | /some/dir | | /foo/bar.dll |
234 | target: | | c:/foo/bar.dll |
235 | target: | | /foo/bar.dll |
236 | target:some/dir | / | c:/foo/bar.dll |
237 | target:some/dir | | /foo/bar.dll |
239 IOW, we don't need to add a separator if IN_PATHNAME already
240 has one, or when the sysroot is exactly "target:".
241 There's no need to check for drive spec explicitly, as we only
242 get here if IN_PATHNAME is considered an absolute path. */
243 need_dir_separator
= !(IS_DIR_SEPARATOR (in_pathname
[0])
244 || strcmp (TARGET_SYSROOT_PREFIX
, sysroot
) == 0);
246 /* Cat the prefixed pathname together. */
247 temp_pathname
.reset (concat (sysroot
,
248 need_dir_separator
? SLASH_STRING
: "",
249 in_pathname
, (char *) NULL
));
252 /* Handle files to be accessed via the target. */
253 if (is_target_filename (temp_pathname
.get ()))
257 return temp_pathname
;
260 /* Now see if we can open it. */
261 found_file
= gdb_open_cloexec (temp_pathname
.get (),
262 O_RDONLY
| O_BINARY
, 0).release ();
264 /* If the search in gdb_sysroot failed, and the path name has a
265 drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
266 and retrying in the sysroot:
267 c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
271 && HAS_TARGET_DRIVE_SPEC (fskind
, in_pathname
))
273 bool need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
274 char drive
[2] = { in_pathname
[0], '\0' };
276 temp_pathname
.reset (concat (sysroot
,
279 need_dir_separator
? SLASH_STRING
: "",
280 in_pathname
+ 2, (char *) NULL
));
282 found_file
= gdb_open_cloexec (temp_pathname
.get (),
283 O_RDONLY
| O_BINARY
, 0).release ();
286 /* If the search in gdb_sysroot still failed, try fully
287 stripping the drive spec, and trying once more in the
288 sysroot before giving up.
290 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
292 temp_pathname
.reset (concat (sysroot
,
293 need_dir_separator
? SLASH_STRING
: "",
294 in_pathname
+ 2, (char *) NULL
));
296 found_file
= gdb_open_cloexec (temp_pathname
.get (),
297 O_RDONLY
| O_BINARY
, 0).release ();
301 /* We try to find the library in various ways. After each attempt,
302 either found_file >= 0 and temp_pathname is a malloc'd string, or
303 found_file < 0 and temp_pathname does not point to storage that
304 needs to be freed. */
307 temp_pathname
.reset (NULL
);
309 /* If the search in gdb_sysroot failed, and the path name is
310 absolute at this point, make it relative. (openp will try and open the
311 file according to its absolute path otherwise, which is not what we want.)
312 Affects subsequent searches for this solib. */
313 if (found_file
< 0 && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
315 /* First, get rid of any drive letters etc. */
316 while (!IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
319 /* Next, get rid of all leading dir separators. */
320 while (IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
324 /* If not found, and we're looking for a solib, search the
325 solib_search_path (if any). */
326 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
327 found_file
= openp (solib_search_path
.c_str (),
328 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
329 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
331 /* If not found, and we're looking for a solib, next search the
332 solib_search_path (if any) for the basename only (ignoring the
333 path). This is to allow reading solibs from a path that differs
334 from the opened path. */
335 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
336 found_file
= openp (solib_search_path
.c_str (),
337 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
338 target_lbasename (fskind
, in_pathname
),
339 O_RDONLY
| O_BINARY
, &temp_pathname
);
341 /* If not found, and we're looking for a solib, try to use target
342 supplied solib search method. */
343 if (is_solib
&& found_file
< 0 && ops
->find_and_open_solib
)
344 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
347 /* If not found, next search the inferior's $PATH environment variable. */
348 if (found_file
< 0 && sysroot
== NULL
)
349 found_file
= openp (current_inferior ()->environment
.get ("PATH"),
350 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
351 O_RDONLY
| O_BINARY
, &temp_pathname
);
353 /* If not found, and we're looking for a solib, next search the
354 inferior's $LD_LIBRARY_PATH environment variable. */
355 if (is_solib
&& found_file
< 0 && sysroot
== NULL
)
356 found_file
= openp (current_inferior ()->environment
.get
358 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
359 O_RDONLY
| O_BINARY
, &temp_pathname
);
369 return temp_pathname
;
372 /* Return the full pathname of the main executable, or NULL if not
373 found. If FD is non-NULL, *FD is set to either -1 or an open file
374 handle for the main executable. */
376 gdb::unique_xmalloc_ptr
<char>
377 exec_file_find (const char *in_pathname
, int *fd
)
379 gdb::unique_xmalloc_ptr
<char> result
;
380 const char *fskind
= effective_target_file_system_kind ();
382 if (in_pathname
== NULL
)
385 if (!gdb_sysroot
.empty () && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
387 result
= solib_find_1 (in_pathname
, fd
, false);
389 if (result
== NULL
&& fskind
== file_system_kind_dos_based
)
393 new_pathname
= (char *) alloca (strlen (in_pathname
) + 5);
394 strcpy (new_pathname
, in_pathname
);
395 strcat (new_pathname
, ".exe");
397 result
= solib_find_1 (new_pathname
, fd
, false);
402 /* It's possible we don't have a full path, but rather just a
403 filename. Some targets, such as HP-UX, don't provide the
406 Attempt to qualify the filename against the source path.
407 (If that fails, we'll just fall back on the original
408 filename. Not much more we can do...) */
410 if (!source_full_path_of (in_pathname
, &result
))
411 result
.reset (xstrdup (in_pathname
));
419 /* Return the full pathname of a shared library file, or NULL if not
420 found. If FD is non-NULL, *FD is set to either -1 or an open file
421 handle for the shared library.
423 The search algorithm used is described in solib_find_1's comment
426 gdb::unique_xmalloc_ptr
<char>
427 solib_find (const char *in_pathname
, int *fd
)
429 const char *solib_symbols_extension
430 = gdbarch_solib_symbols_extension (target_gdbarch ());
432 /* If solib_symbols_extension is set, replace the file's
434 if (solib_symbols_extension
!= NULL
)
436 const char *p
= in_pathname
+ strlen (in_pathname
);
438 while (p
> in_pathname
&& *p
!= '.')
446 = (char *) alloca (p
- in_pathname
+ 1
447 + strlen (solib_symbols_extension
) + 1);
448 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
449 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
450 solib_symbols_extension
);
452 in_pathname
= new_pathname
;
456 return solib_find_1 (in_pathname
, fd
, true);
459 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
460 it is used as file handle to open the file. Throws an error if the file
461 could not be opened. Handles both local and remote file access.
463 If unsuccessful, the FD will be closed (unless FD was -1). */
466 solib_bfd_fopen (const char *pathname
, int fd
)
468 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (pathname
, gnutarget
, fd
));
470 if (abfd
!= NULL
&& !gdb_bfd_has_target_filename (abfd
.get ()))
471 bfd_set_cacheable (abfd
.get (), 1);
475 /* Arrange to free PATHNAME when the error is thrown. */
476 error (_("Could not open `%s' as an executable file: %s"),
477 pathname
, bfd_errmsg (bfd_get_error ()));
483 /* Find shared library PATHNAME and open a BFD for it. */
486 solib_bfd_open (const char *pathname
)
489 const struct bfd_arch_info
*b
;
491 /* Search for shared library file. */
492 gdb::unique_xmalloc_ptr
<char> found_pathname
493 = solib_find (pathname
, &found_file
);
494 if (found_pathname
== NULL
)
496 /* Return failure if the file could not be found, so that we can
497 accumulate messages about missing libraries. */
501 perror_with_name (pathname
);
504 /* Open bfd for shared library. */
505 gdb_bfd_ref_ptr
abfd (solib_bfd_fopen (found_pathname
.get (), found_file
));
507 /* Check bfd format. */
508 if (!bfd_check_format (abfd
.get (), bfd_object
))
509 error (_("`%s': not in executable format: %s"),
510 bfd_get_filename (abfd
.get ()), bfd_errmsg (bfd_get_error ()));
512 /* Check bfd arch. */
513 b
= gdbarch_bfd_arch_info (target_gdbarch ());
514 if (!b
->compatible (b
, bfd_get_arch_info (abfd
.get ())))
515 error (_("`%s': Shared library architecture %s is not compatible "
516 "with target architecture %s."), bfd_get_filename (abfd
.get ()),
517 bfd_get_arch_info (abfd
.get ())->printable_name
,
523 /* Mapping of a core file's shared library sonames to their respective
524 build-ids. Added to the registries of core file bfds. */
526 typedef std::unordered_map
<std::string
, std::string
> soname_build_id_map
;
528 /* Key used to associate a soname_build_id_map to a core file bfd. */
530 static const struct bfd_key
<soname_build_id_map
> cbfd_soname_build_id_data_key
;
535 set_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
,
537 const bfd_build_id
*build_id
)
539 gdb_assert (abfd
.get () != nullptr);
540 gdb_assert (soname
!= nullptr);
541 gdb_assert (build_id
!= nullptr);
543 soname_build_id_map
*mapptr
= cbfd_soname_build_id_data_key
.get (abfd
.get ());
545 if (mapptr
== nullptr)
546 mapptr
= cbfd_soname_build_id_data_key
.emplace (abfd
.get ());
548 (*mapptr
)[soname
] = build_id_to_string (build_id
);
553 gdb::unique_xmalloc_ptr
<char>
554 get_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
, const char *soname
)
556 if (abfd
.get () == nullptr || soname
== nullptr)
559 soname_build_id_map
*mapptr
560 = cbfd_soname_build_id_data_key
.get (abfd
.get ());
562 if (mapptr
== nullptr)
565 auto it
= mapptr
->find (lbasename (soname
));
566 if (it
== mapptr
->end ())
569 return make_unique_xstrdup (it
->second
.c_str ());
572 /* Given a pointer to one of the shared objects in our list of mapped
573 objects, use the recorded name to open a bfd descriptor for the
574 object, build a section table, relocate all the section addresses
575 by the base address at which the shared object was mapped, and then
576 add the sections to the target's section table.
578 FIXME: In most (all?) cases the shared object file name recorded in
579 the dynamic linkage tables will be a fully qualified pathname. For
580 cases where it isn't, do we really mimic the systems search
581 mechanism correctly in the below code (particularly the tilde
582 expansion stuff?). */
585 solib_map_sections (struct so_list
*so
)
587 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
589 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (so
->so_name
));
590 gdb_bfd_ref_ptr
abfd (ops
->bfd_open (filename
.get ()));
595 /* Leave bfd open, core_xfer_memory and "info files" need it. */
596 so
->abfd
= abfd
.release ();
598 /* Copy the full path name into so_name, allowing symbol_file_add
599 to find it later. This also affects the =library-loaded GDB/MI
600 event, and in particular the part of that notification providing
601 the library's host-side path. If we let the target dictate
602 that objfile's path, and the target is different from the host,
603 GDB/MI will not provide the correct host-side path. */
604 if (strlen (bfd_get_filename (so
->abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
605 error (_("Shared library file name is too long."));
606 strcpy (so
->so_name
, bfd_get_filename (so
->abfd
));
608 if (so
->sections
== nullptr)
609 so
->sections
= new target_section_table
;
610 *so
->sections
= build_section_table (so
->abfd
);
612 for (target_section
&p
: *so
->sections
)
614 /* Relocate the section binding addresses as recorded in the shared
615 object's file by the base address to which the object was actually
617 ops
->relocate_section_addresses (so
, &p
);
619 /* If the target didn't provide information about the address
620 range of the shared object, assume we want the location of
621 the .text section. */
622 if (so
->addr_low
== 0 && so
->addr_high
== 0
623 && strcmp (p
.the_bfd_section
->name
, ".text") == 0)
625 so
->addr_low
= p
.addr
;
626 so
->addr_high
= p
.endaddr
;
630 /* Add the shared object's sections to the current set of file
631 section tables. Do this immediately after mapping the object so
632 that later nodes in the list can query this object, as is needed
634 current_program_space
->add_target_sections (so
, *so
->sections
);
639 /* Free symbol-file related contents of SO and reset for possible reloading
640 of SO. If we have opened a BFD for SO, close it. If we have placed SO's
641 sections in some target's section table, the caller is responsible for
644 This function doesn't mess with objfiles at all. If there is an
645 objfile associated with SO that needs to be removed, the caller is
646 responsible for taking care of that. */
649 clear_so (struct so_list
*so
)
651 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
656 gdb_bfd_unref (so
->abfd
);
659 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
660 so
->symbols_loaded
= 0;
663 so
->addr_low
= so
->addr_high
= 0;
665 /* Restore the target-supplied file name. SO_NAME may be the path
666 of the symbol file. */
667 strcpy (so
->so_name
, so
->so_original_name
);
669 /* Do the same for target-specific data. */
670 if (ops
->clear_so
!= NULL
)
674 /* Free the storage associated with the `struct so_list' object SO.
675 If we have opened a BFD for SO, close it.
677 The caller is responsible for removing SO from whatever list it is
678 a member of. If we have placed SO's sections in some target's
679 section table, the caller is responsible for removing them.
681 This function doesn't mess with objfiles at all. If there is an
682 objfile associated with SO that needs to be removed, the caller is
683 responsible for taking care of that. */
686 free_so (struct so_list
*so
)
688 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
697 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
698 be chatty about it. Return true if any symbols were actually loaded. */
701 solib_read_symbols (struct so_list
*so
, symfile_add_flags flags
)
703 if (so
->symbols_loaded
)
705 /* If needed, we've already warned in our caller. */
707 else if (so
->abfd
== NULL
)
709 /* We've already warned about this library, when trying to open
715 flags
|= current_inferior ()->symfile_flags
;
719 /* Have we already loaded this shared object? */
720 so
->objfile
= nullptr;
721 for (objfile
*objfile
: current_program_space
->objfiles ())
723 if (filename_cmp (objfile_name (objfile
), so
->so_name
) == 0
724 && objfile
->addr_low
== so
->addr_low
)
726 so
->objfile
= objfile
;
730 if (so
->objfile
== NULL
)
732 section_addr_info sap
733 = build_section_addr_info_from_section_table (*so
->sections
);
734 so
->objfile
= symbol_file_add_from_bfd (so
->abfd
, so
->so_name
,
737 so
->objfile
->addr_low
= so
->addr_low
;
740 so
->symbols_loaded
= 1;
742 catch (const gdb_exception_error
&e
)
744 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
745 " library symbols for %s:\n"),
755 /* Return true if KNOWN->objfile is used by any other so_list object
756 in the list of shared libraries. Return false otherwise. */
759 solib_used (const struct so_list
*const known
)
761 for (const struct so_list
*pivot
: current_program_space
->solibs ())
762 if (pivot
!= known
&& pivot
->objfile
== known
->objfile
)
770 update_solib_list (int from_tty
)
772 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
773 struct so_list
*inferior
= ops
->current_sos();
774 struct so_list
*gdb
, **gdb_link
;
776 /* We can reach here due to changing solib-search-path or the
777 sysroot, before having any inferior. */
778 if (target_has_execution () && inferior_ptid
!= null_ptid
)
780 struct inferior
*inf
= current_inferior ();
782 /* If we are attaching to a running process for which we
783 have not opened a symbol file, we may be able to get its
786 && current_program_space
->symfile_object_file
== NULL
)
790 ops
->open_symbol_file_object (from_tty
);
792 catch (const gdb_exception
&ex
)
794 exception_fprintf (gdb_stderr
, ex
,
795 "Error reading attached "
796 "process's symbol file.\n");
801 /* GDB and the inferior's dynamic linker each maintain their own
802 list of currently loaded shared objects; we want to bring the
803 former in sync with the latter. Scan both lists, seeing which
804 shared objects appear where. There are three cases:
806 - A shared object appears on both lists. This means that GDB
807 knows about it already, and it's still loaded in the inferior.
808 Nothing needs to happen.
810 - A shared object appears only on GDB's list. This means that
811 the inferior has unloaded it. We should remove the shared
812 object from GDB's tables.
814 - A shared object appears only on the inferior's list. This
815 means that it's just been loaded. We should add it to GDB's
818 So we walk GDB's list, checking each entry to see if it appears
819 in the inferior's list too. If it does, no action is needed, and
820 we remove it from the inferior's list. If it doesn't, the
821 inferior has unloaded it, and we remove it from GDB's list. By
822 the time we're done walking GDB's list, the inferior's list
823 contains only the new shared objects, which we then add. */
825 gdb
= current_program_space
->so_list
;
826 gdb_link
= ¤t_program_space
->so_list
;
829 struct so_list
*i
= inferior
;
830 struct so_list
**i_link
= &inferior
;
832 /* Check to see whether the shared object *gdb also appears in
833 the inferior's current list. */
838 if (ops
->same (gdb
, i
))
843 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
851 /* If the shared object appears on the inferior's list too, then
852 it's still loaded, so we don't need to do anything. Delete
853 it from the inferior's list, and leave it on GDB's list. */
858 gdb_link
= &gdb
->next
;
862 /* If it's not on the inferior's list, remove it from GDB's tables. */
865 /* Notify any observer that the shared object has been
866 unloaded before we remove it from GDB's tables. */
867 gdb::observers::solib_unloaded
.notify (gdb
);
869 current_program_space
->deleted_solibs
.push_back (gdb
->so_name
);
871 *gdb_link
= gdb
->next
;
873 /* Unless the user loaded it explicitly, free SO's objfile. */
874 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
)
875 && !solib_used (gdb
))
876 gdb
->objfile
->unlink ();
878 /* Some targets' section tables might be referring to
879 sections from so->abfd; remove them. */
880 current_program_space
->remove_target_sections (gdb
);
887 /* Now the inferior's list contains only shared objects that don't
888 appear in GDB's list --- those that are newly loaded. Add them
889 to GDB's shared object list. */
893 const char *not_found_filename
= NULL
;
897 /* Add the new shared objects to GDB's list. */
898 *gdb_link
= inferior
;
900 /* Fill in the rest of each of the `struct so_list' nodes. */
901 for (i
= inferior
; i
; i
= i
->next
)
904 i
->pspace
= current_program_space
;
905 current_program_space
->added_solibs
.push_back (i
);
909 /* Fill in the rest of the `struct so_list' node. */
910 if (!solib_map_sections (i
))
913 if (not_found_filename
== NULL
)
914 not_found_filename
= i
->so_original_name
;
918 catch (const gdb_exception_error
&e
)
920 exception_fprintf (gdb_stderr
, e
,
921 _("Error while mapping shared "
922 "library sections:\n"));
925 /* Notify any observer that the shared object has been
926 loaded now that we've added it to GDB's tables. */
927 gdb::observers::solib_loaded
.notify (i
);
930 /* If a library was not found, issue an appropriate warning
931 message. We have to use a single call to warning in case the
932 front end does something special with warnings, e.g., pop up
933 a dialog box. It Would Be Nice if we could get a "warning: "
934 prefix on each line in the CLI front end, though - it doesn't
938 warning (_("Could not load shared library symbols for %s.\n"
939 "Do you need \"set solib-search-path\" "
940 "or \"set sysroot\"?"),
942 else if (not_found
> 1)
944 Could not load shared library symbols for %d libraries, e.g. %s.\n\
945 Use the \"info sharedlibrary\" command to see the complete listing.\n\
946 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
947 not_found
, not_found_filename
);
952 /* Return non-zero if NAME is the libpthread shared library.
954 Uses a fairly simplistic heuristic approach where we check
955 the file name against "/libpthread". This can lead to false
956 positives, but this should be good enough in practice.
958 As of glibc-2.34, functions formerly residing in libpthread have
959 been moved to libc, so "/libc." needs to be checked too. (Matching
960 the "." will avoid matching libraries such as libcrypt.) */
963 libpthread_name_p (const char *name
)
965 return (strstr (name
, "/libpthread") != NULL
966 || strstr (name
, "/libc.") != NULL
);
969 /* Return non-zero if SO is the libpthread shared library. */
972 libpthread_solib_p (struct so_list
*so
)
974 return libpthread_name_p (so
->so_name
);
977 /* Read in symbolic information for any shared objects whose names
978 match PATTERN. (If we've already read a shared object's symbol
979 info, leave it alone.) If PATTERN is zero, read them all.
981 If READSYMS is 0, defer reading symbolic information until later
982 but still do any needed low level processing.
984 FROM_TTY is described for update_solib_list, above. */
987 solib_add (const char *pattern
, int from_tty
, int readsyms
)
989 if (print_symbol_loading_p (from_tty
, 0, 0))
993 printf_unfiltered (_("Loading symbols for shared libraries: %s\n"),
997 printf_unfiltered (_("Loading symbols for shared libraries.\n"));
1000 current_program_space
->solib_add_generation
++;
1004 char *re_err
= re_comp (pattern
);
1007 error (_("Invalid regexp: %s"), re_err
);
1010 update_solib_list (from_tty
);
1012 /* Walk the list of currently loaded shared libraries, and read
1013 symbols for any that match the pattern --- or any whose symbols
1014 aren't already loaded, if no pattern was given. */
1016 bool any_matches
= false;
1017 bool loaded_any_symbols
= false;
1018 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1021 add_flags
|= SYMFILE_VERBOSE
;
1023 for (struct so_list
*gdb
: current_program_space
->solibs ())
1024 if (! pattern
|| re_exec (gdb
->so_name
))
1026 /* Normally, we would read the symbols from that library
1027 only if READSYMS is set. However, we're making a small
1028 exception for the pthread library, because we sometimes
1029 need the library symbols to be loaded in order to provide
1030 thread support (x86-linux for instance). */
1031 const int add_this_solib
=
1032 (readsyms
|| libpthread_solib_p (gdb
));
1037 if (gdb
->symbols_loaded
)
1039 /* If no pattern was given, be quiet for shared
1040 libraries we have already loaded. */
1041 if (pattern
&& (from_tty
|| info_verbose
))
1042 printf_unfiltered (_("Symbols already loaded for %s\n"),
1045 else if (solib_read_symbols (gdb
, add_flags
))
1046 loaded_any_symbols
= true;
1050 if (loaded_any_symbols
)
1051 breakpoint_re_set ();
1053 if (from_tty
&& pattern
&& ! any_matches
)
1055 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
1057 if (loaded_any_symbols
)
1059 /* Getting new symbols may change our opinion about what is
1061 reinit_frame_cache ();
1066 /* Implement the "info sharedlibrary" command. Walk through the
1067 shared library list and print information about each attached
1068 library matching PATTERN. If PATTERN is elided, print them
1072 info_sharedlibrary_command (const char *pattern
, int from_tty
)
1074 bool so_missing_debug_info
= false;
1077 struct gdbarch
*gdbarch
= target_gdbarch ();
1078 struct ui_out
*uiout
= current_uiout
;
1082 char *re_err
= re_comp (pattern
);
1085 error (_("Invalid regexp: %s"), re_err
);
1088 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1089 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1091 update_solib_list (from_tty
);
1093 /* ui_out_emit_table table_emitter needs to know the number of rows,
1094 so we need to make two passes over the libs. */
1097 for (struct so_list
*so
: current_program_space
->solibs ())
1101 if (pattern
&& ! re_exec (so
->so_name
))
1108 ui_out_emit_table
table_emitter (uiout
, 4, nr_libs
, "SharedLibraryTable");
1110 /* The "- 1" is because ui_out adds one space between columns. */
1111 uiout
->table_header (addr_width
- 1, ui_left
, "from", "From");
1112 uiout
->table_header (addr_width
- 1, ui_left
, "to", "To");
1113 uiout
->table_header (12 - 1, ui_left
, "syms-read", "Syms Read");
1114 uiout
->table_header (0, ui_noalign
, "name", "Shared Object Library");
1116 uiout
->table_body ();
1118 for (struct so_list
*so
: current_program_space
->solibs ())
1120 if (! so
->so_name
[0])
1122 if (pattern
&& ! re_exec (so
->so_name
))
1125 ui_out_emit_tuple
tuple_emitter (uiout
, "lib");
1127 if (so
->addr_high
!= 0)
1129 uiout
->field_core_addr ("from", gdbarch
, so
->addr_low
);
1130 uiout
->field_core_addr ("to", gdbarch
, so
->addr_high
);
1134 uiout
->field_skip ("from");
1135 uiout
->field_skip ("to");
1138 if (! top_level_interpreter ()->interp_ui_out ()->is_mi_like_p ()
1139 && so
->symbols_loaded
1140 && !objfile_has_symbols (so
->objfile
))
1142 so_missing_debug_info
= true;
1143 uiout
->field_string ("syms-read", "Yes (*)");
1146 uiout
->field_string ("syms-read", so
->symbols_loaded
? "Yes" : "No");
1148 uiout
->field_string ("name", so
->so_name
, file_name_style
.style ());
1157 uiout
->message (_("No shared libraries matched.\n"));
1159 uiout
->message (_("No shared libraries loaded at this time.\n"));
1163 if (so_missing_debug_info
)
1164 uiout
->message (_("(*): Shared library is missing "
1165 "debugging information.\n"));
1172 solib_contains_address_p (const struct so_list
*const solib
,
1175 if (solib
->sections
== nullptr)
1178 for (target_section
&p
: *solib
->sections
)
1179 if (p
.addr
<= address
&& address
< p
.endaddr
)
1185 /* If ADDRESS is in a shared lib in program space PSPACE, return its
1188 Provides a hook for other gdb routines to discover whether or not a
1189 particular address is within the mapped address space of a shared
1192 For example, this routine is called at one point to disable
1193 breakpoints which are in shared libraries that are not currently
1197 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1199 struct so_list
*so
= NULL
;
1201 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1202 if (solib_contains_address_p (so
, address
))
1203 return (so
->so_name
);
1211 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1213 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1215 if (ops
->keep_data_in_core
)
1216 return ops
->keep_data_in_core (vaddr
, size
) != 0;
1221 /* Called by free_all_symtabs */
1226 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1228 disable_breakpoints_in_shlibs ();
1230 while (current_program_space
->so_list
)
1232 struct so_list
*so
= current_program_space
->so_list
;
1234 current_program_space
->so_list
= so
->next
;
1235 gdb::observers::solib_unloaded
.notify (so
);
1236 current_program_space
->remove_target_sections (so
);
1240 ops
->clear_solib ();
1243 /* Shared library startup support. When GDB starts up the inferior,
1244 it nurses it along (through the shell) until it is ready to execute
1245 its first instruction. At this point, this function gets
1249 solib_create_inferior_hook (int from_tty
)
1251 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1253 ops
->solib_create_inferior_hook (from_tty
);
1259 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1261 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1263 return ops
->in_dynsym_resolve_code (pc
) != 0;
1266 /* Implements the "sharedlibrary" command. */
1269 sharedlibrary_command (const char *args
, int from_tty
)
1272 solib_add (args
, from_tty
, 1);
1275 /* Implements the command "nosharedlibrary", which discards symbols
1276 that have been auto-loaded from shared libraries. Symbols from
1277 shared libraries that were added by explicit request of the user
1278 are not discarded. Also called from remote.c. */
1281 no_shared_libraries (const char *ignored
, int from_tty
)
1283 /* The order of the two routines below is important: clear_solib notifies
1284 the solib_unloaded observers, and some of these observers might need
1285 access to their associated objfiles. Therefore, we can not purge the
1286 solibs' objfiles before clear_solib has been called. */
1289 objfile_purge_solibs ();
1295 update_solib_breakpoints (void)
1297 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1299 if (ops
->update_breakpoints
!= NULL
)
1300 ops
->update_breakpoints ();
1306 handle_solib_event (void)
1308 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1310 if (ops
->handle_event
!= NULL
)
1311 ops
->handle_event ();
1313 current_inferior ()->pspace
->clear_solib_cache ();
1315 /* Check for any newly added shared libraries if we're supposed to
1316 be adding them automatically. Switch terminal for any messages
1317 produced by breakpoint_re_set. */
1318 target_terminal::ours_for_output ();
1319 solib_add (NULL
, 0, auto_solib_add
);
1320 target_terminal::inferior ();
1323 /* Reload shared libraries, but avoid reloading the same symbol file
1324 we already have loaded. */
1327 reload_shared_libraries_1 (int from_tty
)
1329 if (print_symbol_loading_p (from_tty
, 0, 0))
1330 printf_unfiltered (_("Loading symbols for shared libraries.\n"));
1332 for (struct so_list
*so
: current_program_space
->solibs ())
1334 const char *found_pathname
= NULL
;
1335 bool was_loaded
= so
->symbols_loaded
!= 0;
1336 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1339 add_flags
|= SYMFILE_VERBOSE
;
1341 gdb::unique_xmalloc_ptr
<char> filename
1342 (tilde_expand (so
->so_original_name
));
1343 gdb_bfd_ref_ptr
abfd (solib_bfd_open (filename
.get ()));
1345 found_pathname
= bfd_get_filename (abfd
.get ());
1347 /* If this shared library is no longer associated with its previous
1348 symbol file, close that. */
1349 if ((found_pathname
== NULL
&& was_loaded
)
1350 || (found_pathname
!= NULL
1351 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1353 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
)
1354 && !solib_used (so
))
1355 so
->objfile
->unlink ();
1356 current_program_space
->remove_target_sections (so
);
1360 /* If this shared library is now associated with a new symbol
1362 if (found_pathname
!= NULL
1364 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1366 bool got_error
= false;
1370 solib_map_sections (so
);
1373 catch (const gdb_exception_error
&e
)
1375 exception_fprintf (gdb_stderr
, e
,
1376 _("Error while mapping "
1377 "shared library sections:\n"));
1382 && (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
)))
1383 solib_read_symbols (so
, add_flags
);
1389 reload_shared_libraries (const char *ignored
, int from_tty
,
1390 struct cmd_list_element
*e
)
1392 const struct target_so_ops
*ops
;
1394 reload_shared_libraries_1 (from_tty
);
1396 ops
= solib_ops (target_gdbarch ());
1398 /* Creating inferior hooks here has two purposes. First, if we reload
1399 shared libraries then the address of solib breakpoint we've computed
1400 previously might be no longer valid. For example, if we forgot to set
1401 solib-absolute-prefix and are setting it right now, then the previous
1402 breakpoint address is plain wrong. Second, installing solib hooks
1403 also implicitly figures were ld.so is and loads symbols for it.
1404 Absent this call, if we've just connected to a target and set
1405 solib-absolute-prefix or solib-search-path, we'll lose all information
1407 if (target_has_execution ())
1409 /* Reset or free private data structures not associated with
1411 ops
->clear_solib ();
1413 /* Remove any previous solib event breakpoint. This is usually
1414 done in common code, at breakpoint_init_inferior time, but
1415 we're not really starting up the inferior here. */
1416 remove_solib_event_breakpoints ();
1418 solib_create_inferior_hook (from_tty
);
1421 /* Sometimes the platform-specific hook loads initial shared
1422 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1423 incorrectly 0 but such solib targets should be fixed anyway. If we
1424 made all the inferior hook methods consistent, this call could be
1425 removed. Call it only after the solib target has been initialized by
1426 solib_create_inferior_hook. */
1428 solib_add (NULL
, 0, auto_solib_add
);
1430 breakpoint_re_set ();
1432 /* We may have loaded or unloaded debug info for some (or all)
1433 shared libraries. However, frames may still reference them. For
1434 example, a frame's unwinder might still point at DWARF FDE
1435 structures that are now freed. Also, getting new symbols may
1436 change our opinion about what is frameless. */
1437 reinit_frame_cache ();
1440 /* Wrapper for reload_shared_libraries that replaces "remote:"
1441 at the start of gdb_sysroot with "target:". */
1444 gdb_sysroot_changed (const char *ignored
, int from_tty
,
1445 struct cmd_list_element
*e
)
1447 const char *old_prefix
= "remote:";
1448 const char *new_prefix
= TARGET_SYSROOT_PREFIX
;
1450 if (startswith (gdb_sysroot
.c_str (), old_prefix
))
1452 static bool warning_issued
= false;
1454 gdb_assert (strlen (old_prefix
) == strlen (new_prefix
));
1455 gdb_sysroot
= new_prefix
+ gdb_sysroot
.substr (strlen (old_prefix
));
1457 if (!warning_issued
)
1459 warning (_("\"%s\" is deprecated, use \"%s\" instead."),
1460 old_prefix
, new_prefix
);
1461 warning (_("sysroot set to \"%s\"."), gdb_sysroot
.c_str ());
1463 warning_issued
= true;
1467 reload_shared_libraries (ignored
, from_tty
, e
);
1471 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1472 struct cmd_list_element
*c
, const char *value
)
1474 fprintf_filtered (file
, _("Autoloading of shared library symbols is %s.\n"),
1479 /* Lookup the value for a specific symbol from dynamic symbol table. Look
1480 up symbol from ABFD. MATCH_SYM is a callback function to determine
1481 whether to pick up a symbol. DATA is the input of this callback
1482 function. Return NULL if symbol is not found. */
1485 gdb_bfd_lookup_symbol_from_symtab (bfd
*abfd
,
1486 int (*match_sym
) (const asymbol
*,
1490 long storage_needed
= bfd_get_symtab_upper_bound (abfd
);
1491 CORE_ADDR symaddr
= 0;
1493 if (storage_needed
> 0)
1497 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1498 asymbol
**symbol_table
= storage
.data ();
1499 unsigned int number_of_symbols
=
1500 bfd_canonicalize_symtab (abfd
, symbol_table
);
1502 for (i
= 0; i
< number_of_symbols
; i
++)
1504 asymbol
*sym
= *symbol_table
++;
1506 if (match_sym (sym
, data
))
1508 struct gdbarch
*gdbarch
= target_gdbarch ();
1509 symaddr
= sym
->value
;
1511 /* Some ELF targets fiddle with addresses of symbols they
1512 consider special. They use minimal symbols to do that
1513 and this is needed for correct breakpoint placement,
1514 but we do not have full data here to build a complete
1515 minimal symbol, so just set the address and let the
1516 targets cope with that. */
1517 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1518 && gdbarch_elf_make_msymbol_special_p (gdbarch
))
1520 struct minimal_symbol msym
{};
1522 SET_MSYMBOL_VALUE_ADDRESS (&msym
, symaddr
);
1523 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, &msym
);
1524 symaddr
= MSYMBOL_VALUE_RAW_ADDRESS (&msym
);
1527 /* BFD symbols are section relative. */
1528 symaddr
+= sym
->section
->vma
;
1540 gdb_bfd_scan_elf_dyntag (const int desired_dyntag
, bfd
*abfd
, CORE_ADDR
*ptr
,
1541 CORE_ADDR
*ptr_addr
)
1543 int arch_size
, step
, sect_size
;
1544 long current_dyntag
;
1545 CORE_ADDR dyn_ptr
, dyn_addr
;
1546 gdb_byte
*bufend
, *bufstart
, *buf
;
1547 Elf32_External_Dyn
*x_dynp_32
;
1548 Elf64_External_Dyn
*x_dynp_64
;
1549 struct bfd_section
*sect
;
1554 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
1557 arch_size
= bfd_get_arch_size (abfd
);
1558 if (arch_size
== -1)
1561 /* Find the start address of the .dynamic section. */
1562 sect
= bfd_get_section_by_name (abfd
, ".dynamic");
1567 for (const target_section
&target_section
1568 : current_program_space
->target_sections ())
1569 if (sect
== target_section
.the_bfd_section
)
1571 dyn_addr
= target_section
.addr
;
1577 /* ABFD may come from OBJFILE acting only as a symbol file without being
1578 loaded into the target (see add_symbol_file_command). This case is
1579 such fallback to the file VMA address without the possibility of
1580 having the section relocated to its actual in-memory address. */
1582 dyn_addr
= bfd_section_vma (sect
);
1585 /* Read in .dynamic from the BFD. We will get the actual value
1586 from memory later. */
1587 sect_size
= bfd_section_size (sect
);
1588 buf
= bufstart
= (gdb_byte
*) alloca (sect_size
);
1589 if (!bfd_get_section_contents (abfd
, sect
,
1593 /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
1594 step
= (arch_size
== 32) ? sizeof (Elf32_External_Dyn
)
1595 : sizeof (Elf64_External_Dyn
);
1596 for (bufend
= buf
+ sect_size
;
1600 if (arch_size
== 32)
1602 x_dynp_32
= (Elf32_External_Dyn
*) buf
;
1603 current_dyntag
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_tag
);
1604 dyn_ptr
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_un
.d_ptr
);
1608 x_dynp_64
= (Elf64_External_Dyn
*) buf
;
1609 current_dyntag
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_tag
);
1610 dyn_ptr
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_un
.d_ptr
);
1612 if (current_dyntag
== DT_NULL
)
1614 if (current_dyntag
== desired_dyntag
)
1616 /* If requested, try to read the runtime value of this .dynamic
1620 struct type
*ptr_type
;
1621 gdb_byte ptr_buf
[8];
1622 CORE_ADDR ptr_addr_1
;
1624 ptr_type
= builtin_type (target_gdbarch ())->builtin_data_ptr
;
1625 ptr_addr_1
= dyn_addr
+ (buf
- bufstart
) + arch_size
/ 8;
1626 if (target_read_memory (ptr_addr_1
, ptr_buf
, arch_size
/ 8) == 0)
1627 dyn_ptr
= extract_typed_address (ptr_buf
, ptr_type
);
1630 *ptr_addr
= dyn_addr
+ (buf
- bufstart
);
1641 gdb::unique_xmalloc_ptr
<char>
1642 gdb_bfd_read_elf_soname (const char *filename
)
1644 gdb_bfd_ref_ptr abfd
= gdb_bfd_open (filename
, gnutarget
);
1646 if (abfd
== nullptr)
1649 /* Check that ABFD is an ET_DYN ELF file. */
1650 if (!bfd_check_format (abfd
.get (), bfd_object
)
1651 || !(bfd_get_file_flags (abfd
.get ()) & DYNAMIC
))
1655 if (!gdb_bfd_scan_elf_dyntag (DT_SONAME
, abfd
.get (), &idx
, nullptr))
1658 struct bfd_section
*dynstr
= bfd_get_section_by_name (abfd
.get (), ".dynstr");
1659 int sect_size
= bfd_section_size (dynstr
);
1660 if (dynstr
== nullptr || sect_size
<= idx
)
1663 /* Read soname from the string table. */
1664 gdb::byte_vector dynstr_buf
;
1665 if (!gdb_bfd_get_full_section_contents (abfd
.get (), dynstr
, &dynstr_buf
))
1668 /* Ensure soname is null-terminated before returning a copy. */
1669 char *soname
= (char *) dynstr_buf
.data () + idx
;
1670 if (strnlen (soname
, sect_size
- idx
) == sect_size
- idx
)
1673 return make_unique_xstrdup (soname
);
1676 /* Lookup the value for a specific symbol from symbol table. Look up symbol
1677 from ABFD. MATCH_SYM is a callback function to determine whether to pick
1678 up a symbol. DATA is the input of this callback function. Return NULL
1679 if symbol is not found. */
1682 bfd_lookup_symbol_from_dyn_symtab (bfd
*abfd
,
1683 int (*match_sym
) (const asymbol
*,
1687 long storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
1688 CORE_ADDR symaddr
= 0;
1690 if (storage_needed
> 0)
1693 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1694 asymbol
**symbol_table
= storage
.data ();
1695 unsigned int number_of_symbols
=
1696 bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
1698 for (i
= 0; i
< number_of_symbols
; i
++)
1700 asymbol
*sym
= *symbol_table
++;
1702 if (match_sym (sym
, data
))
1704 /* BFD symbols are section relative. */
1705 symaddr
= sym
->value
+ sym
->section
->vma
;
1713 /* Lookup the value for a specific symbol from symbol table and dynamic
1714 symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
1715 function to determine whether to pick up a symbol. DATA is the
1716 input of this callback function. Return NULL if symbol is not
1720 gdb_bfd_lookup_symbol (bfd
*abfd
,
1721 int (*match_sym
) (const asymbol
*, const void *),
1724 CORE_ADDR symaddr
= gdb_bfd_lookup_symbol_from_symtab (abfd
, match_sym
, data
);
1726 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
1727 have to check the dynamic string table too. */
1729 symaddr
= bfd_lookup_symbol_from_dyn_symtab (abfd
, match_sym
, data
);
1734 /* The shared library list may contain user-loaded object files that
1735 can be removed out-of-band by the user. So upon notification of
1736 free_objfile remove all references to any user-loaded file that is
1737 about to be freed. */
1740 remove_user_added_objfile (struct objfile
*objfile
)
1742 if (objfile
!= 0 && objfile
->flags
& OBJF_USERLOADED
)
1744 for (struct so_list
*so
: current_program_space
->solibs ())
1745 if (so
->objfile
== objfile
)
1750 void _initialize_solib ();
1752 _initialize_solib ()
1754 solib_data
= gdbarch_data_register_pre_init (solib_init
);
1756 gdb::observers::free_objfile
.attach (remove_user_added_objfile
,
1758 gdb::observers::inferior_execd
.attach ([] (inferior
*inf
)
1760 solib_create_inferior_hook (0);
1763 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1764 _("Load shared object library symbols for files matching REGEXP."));
1765 cmd_list_element
*info_sharedlibrary_cmd
1766 = add_info ("sharedlibrary", info_sharedlibrary_command
,
1767 _("Status of loaded shared object libraries."));
1768 add_info_alias ("dll", info_sharedlibrary_cmd
, 1);
1769 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1770 _("Unload all shared object library symbols."));
1772 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1773 &auto_solib_add
, _("\
1774 Set autoloading of shared library symbols."), _("\
1775 Show autoloading of shared library symbols."), _("\
1776 If \"on\", symbols from all shared object libraries will be loaded\n\
1777 automatically when the inferior begins execution, when the dynamic linker\n\
1778 informs gdb that a new library has been loaded, or when attaching to the\n\
1779 inferior. Otherwise, symbols must be loaded manually, using \
1782 show_auto_solib_add
,
1783 &setlist
, &showlist
);
1785 set_show_commands sysroot_cmds
1786 = add_setshow_optional_filename_cmd ("sysroot", class_support
,
1788 Set an alternate system root."), _("\
1789 Show the current system root."), _("\
1790 The system root is used to load absolute shared library symbol files.\n\
1791 For other (relative) files, you can add directories using\n\
1792 `set solib-search-path'."),
1793 gdb_sysroot_changed
,
1795 &setlist
, &showlist
);
1797 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.set
, class_support
, 0,
1799 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.show
, class_support
, 0,
1802 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1803 &solib_search_path
, _("\
1804 Set the search path for loading non-absolute shared library symbol files."),
1806 Show the search path for loading non-absolute shared library symbol files."),
1808 This takes precedence over the environment variables \
1809 PATH and LD_LIBRARY_PATH."),
1810 reload_shared_libraries
,
1811 show_solib_search_path
,
1812 &setlist
, &showlist
);