1 /* Handle shared libraries for GDB, the GNU Debugger.
3 Copyright (C) 1990-2023 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"
52 #include "gdbsupport/scoped_fd.h"
53 #include "debuginfod-support.h"
55 #include "cli/cli-style.h"
56 #include "solib-target.h"
62 /* If non-empty, this is a search path for loading non-absolute shared library
63 symbol files. This takes precedence over the environment variables PATH
64 and LD_LIBRARY_PATH. */
65 static std::string solib_search_path
;
67 show_solib_search_path (struct ui_file
*file
, int from_tty
,
68 struct cmd_list_element
*c
, const char *value
)
70 gdb_printf (file
, _("The search path for loading non-absolute "
71 "shared library symbol files is %s.\n"),
75 /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
76 #if (HAVE_DOS_BASED_FILE_SYSTEM)
77 # define DOS_BASED_FILE_SYSTEM 1
79 # define DOS_BASED_FILE_SYSTEM 0
82 /* Return the full pathname of a binary file (the main executable or a
83 shared library file), or NULL if not found. If FD is non-NULL, *FD
84 is set to either -1 or an open file handle for the binary file.
86 Global variable GDB_SYSROOT is used as a prefix directory
87 to search for binary files if they have an absolute path.
88 If GDB_SYSROOT starts with "target:" and target filesystem
89 is the local filesystem then the "target:" prefix will be
90 stripped before the search starts. This ensures that the
91 same search algorithm is used for local files regardless of
92 whether a "target:" prefix was used.
94 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
95 (or set of directories, as in LD_LIBRARY_PATH) to search for all
96 shared libraries if not found in either the sysroot (if set) or
97 the local filesystem. SOLIB_SEARCH_PATH is not used when searching
98 for the main executable.
101 * If a sysroot is set and path is absolute:
102 * Search for sysroot/path.
104 * Look for it literally (unmodified).
105 * If IS_SOLIB is non-zero:
106 * Look in SOLIB_SEARCH_PATH.
107 * If available, use target defined search function.
108 * If NO sysroot is set, perform the following two searches:
109 * Look in inferior's $PATH.
110 * If IS_SOLIB is non-zero:
111 * Look in inferior's $LD_LIBRARY_PATH.
113 * The last check avoids doing this search when targeting remote
114 * machines since a sysroot will almost always be set.
117 static gdb::unique_xmalloc_ptr
<char>
118 solib_find_1 (const char *in_pathname
, int *fd
, bool is_solib
)
120 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
122 gdb::unique_xmalloc_ptr
<char> temp_pathname
;
123 const char *fskind
= effective_target_file_system_kind ();
124 const char *sysroot
= gdb_sysroot
.c_str ();
125 int prefix_len
, orig_prefix_len
;
127 /* If the absolute prefix starts with "target:" but the filesystem
128 accessed by the target_fileio_* methods is the local filesystem
129 then we strip the "target:" prefix now and work with the local
130 filesystem. This ensures that the same search algorithm is used
131 for all local files regardless of whether a "target:" prefix was
133 if (is_target_filename (sysroot
) && target_filesystem_is_local ())
134 sysroot
+= strlen (TARGET_SYSROOT_PREFIX
);
136 /* Strip any trailing slashes from the absolute prefix. */
137 prefix_len
= orig_prefix_len
= strlen (sysroot
);
139 while (prefix_len
> 0 && IS_DIR_SEPARATOR (sysroot
[prefix_len
- 1]))
142 std::string sysroot_holder
;
145 else if (prefix_len
!= orig_prefix_len
)
147 sysroot_holder
= std::string (sysroot
, prefix_len
);
148 sysroot
= sysroot_holder
.c_str ();
151 /* If we're on a non-DOS-based system, backslashes won't be
152 understood as directory separator, so, convert them to forward
153 slashes, iff we're supposed to handle DOS-based file system
154 semantics for target paths. */
155 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
159 /* Avoid clobbering our input. */
160 p
= (char *) alloca (strlen (in_pathname
) + 1);
161 strcpy (p
, in_pathname
);
171 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
172 IS_ABSOLUTE_PATH. The latter is for host paths only, while
173 IN_PATHNAME is a target path. For example, if we're supposed to
174 be handling DOS-like semantics we want to consider a
175 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
176 With such a path, before giving up on the sysroot, we'll try:
178 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
179 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
180 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
183 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || sysroot
== NULL
)
184 temp_pathname
.reset (xstrdup (in_pathname
));
187 bool need_dir_separator
;
189 /* Concatenate the sysroot and the target reported filename. We
190 may need to glue them with a directory separator. Cases to
193 | sysroot | separator | in_pathname |
194 |-----------------+-----------+----------------|
195 | /some/dir | / | c:/foo/bar.dll |
196 | /some/dir | | /foo/bar.dll |
197 | target: | | c:/foo/bar.dll |
198 | target: | | /foo/bar.dll |
199 | target:some/dir | / | c:/foo/bar.dll |
200 | target:some/dir | | /foo/bar.dll |
202 IOW, we don't need to add a separator if IN_PATHNAME already
203 has one, or when the sysroot is exactly "target:".
204 There's no need to check for drive spec explicitly, as we only
205 get here if IN_PATHNAME is considered an absolute path. */
206 need_dir_separator
= !(IS_DIR_SEPARATOR (in_pathname
[0])
207 || strcmp (TARGET_SYSROOT_PREFIX
, sysroot
) == 0);
209 /* Cat the prefixed pathname together. */
210 temp_pathname
.reset (concat (sysroot
,
211 need_dir_separator
? SLASH_STRING
: "",
212 in_pathname
, (char *) NULL
));
215 /* Handle files to be accessed via the target. */
216 if (is_target_filename (temp_pathname
.get ()))
220 return temp_pathname
;
223 /* Now see if we can open it. */
224 found_file
= gdb_open_cloexec (temp_pathname
.get (),
225 O_RDONLY
| O_BINARY
, 0).release ();
227 /* If the search in gdb_sysroot failed, and the path name has a
228 drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
229 and retrying in the sysroot:
230 c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
234 && HAS_TARGET_DRIVE_SPEC (fskind
, in_pathname
))
236 bool need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
237 char drive
[2] = { in_pathname
[0], '\0' };
239 temp_pathname
.reset (concat (sysroot
,
242 need_dir_separator
? SLASH_STRING
: "",
243 in_pathname
+ 2, (char *) NULL
));
245 found_file
= gdb_open_cloexec (temp_pathname
.get (),
246 O_RDONLY
| O_BINARY
, 0).release ();
249 /* If the search in gdb_sysroot still failed, try fully
250 stripping the drive spec, and trying once more in the
251 sysroot before giving up.
253 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
255 temp_pathname
.reset (concat (sysroot
,
256 need_dir_separator
? SLASH_STRING
: "",
257 in_pathname
+ 2, (char *) NULL
));
259 found_file
= gdb_open_cloexec (temp_pathname
.get (),
260 O_RDONLY
| O_BINARY
, 0).release ();
264 /* We try to find the library in various ways. After each attempt,
265 either found_file >= 0 and temp_pathname is a malloc'd string, or
266 found_file < 0 and temp_pathname does not point to storage that
267 needs to be freed. */
270 temp_pathname
.reset (NULL
);
272 /* If the search in gdb_sysroot failed, and the path name is
273 absolute at this point, make it relative. (openp will try and open the
274 file according to its absolute path otherwise, which is not what we want.)
275 Affects subsequent searches for this solib. */
276 if (found_file
< 0 && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
278 /* First, get rid of any drive letters etc. */
279 while (!IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
282 /* Next, get rid of all leading dir separators. */
283 while (IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
287 /* If not found, and we're looking for a solib, search the
288 solib_search_path (if any). */
289 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
290 found_file
= openp (solib_search_path
.c_str (),
291 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
292 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
294 /* If not found, and we're looking for a solib, next search the
295 solib_search_path (if any) for the basename only (ignoring the
296 path). This is to allow reading solibs from a path that differs
297 from the opened path. */
298 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
299 found_file
= openp (solib_search_path
.c_str (),
300 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
301 target_lbasename (fskind
, in_pathname
),
302 O_RDONLY
| O_BINARY
, &temp_pathname
);
304 /* If not found, and we're looking for a solib, try to use target
305 supplied solib search method. */
306 if (is_solib
&& found_file
< 0 && ops
->find_and_open_solib
)
307 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
310 /* If not found, next search the inferior's $PATH environment variable. */
311 if (found_file
< 0 && sysroot
== NULL
)
312 found_file
= openp (current_inferior ()->environment
.get ("PATH"),
313 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
314 O_RDONLY
| O_BINARY
, &temp_pathname
);
316 /* If not found, and we're looking for a solib, next search the
317 inferior's $LD_LIBRARY_PATH environment variable. */
318 if (is_solib
&& found_file
< 0 && sysroot
== NULL
)
319 found_file
= openp (current_inferior ()->environment
.get
321 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
322 O_RDONLY
| O_BINARY
, &temp_pathname
);
332 return temp_pathname
;
335 /* Return the full pathname of the main executable, or NULL if not
336 found. If FD is non-NULL, *FD is set to either -1 or an open file
337 handle for the main executable. */
339 gdb::unique_xmalloc_ptr
<char>
340 exec_file_find (const char *in_pathname
, int *fd
)
342 gdb::unique_xmalloc_ptr
<char> result
;
343 const char *fskind
= effective_target_file_system_kind ();
345 if (in_pathname
== NULL
)
348 if (!gdb_sysroot
.empty () && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
350 result
= solib_find_1 (in_pathname
, fd
, false);
352 if (result
== NULL
&& fskind
== file_system_kind_dos_based
)
356 new_pathname
= (char *) alloca (strlen (in_pathname
) + 5);
357 strcpy (new_pathname
, in_pathname
);
358 strcat (new_pathname
, ".exe");
360 result
= solib_find_1 (new_pathname
, fd
, false);
365 /* It's possible we don't have a full path, but rather just a
366 filename. Some targets, such as HP-UX, don't provide the
369 Attempt to qualify the filename against the source path.
370 (If that fails, we'll just fall back on the original
371 filename. Not much more we can do...) */
373 if (!source_full_path_of (in_pathname
, &result
))
374 result
.reset (xstrdup (in_pathname
));
382 /* Return the full pathname of a shared library file, or NULL if not
383 found. If FD is non-NULL, *FD is set to either -1 or an open file
384 handle for the shared library.
386 The search algorithm used is described in solib_find_1's comment
389 gdb::unique_xmalloc_ptr
<char>
390 solib_find (const char *in_pathname
, int *fd
)
392 const char *solib_symbols_extension
393 = gdbarch_solib_symbols_extension (target_gdbarch ());
395 /* If solib_symbols_extension is set, replace the file's
397 if (solib_symbols_extension
!= NULL
)
399 const char *p
= in_pathname
+ strlen (in_pathname
);
401 while (p
> in_pathname
&& *p
!= '.')
409 = (char *) alloca (p
- in_pathname
+ 1
410 + strlen (solib_symbols_extension
) + 1);
411 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
412 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
413 solib_symbols_extension
);
415 in_pathname
= new_pathname
;
419 return solib_find_1 (in_pathname
, fd
, true);
422 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
423 it is used as file handle to open the file. Throws an error if the file
424 could not be opened. Handles both local and remote file access.
426 If unsuccessful, the FD will be closed (unless FD was -1). */
429 solib_bfd_fopen (const char *pathname
, int fd
)
431 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (pathname
, gnutarget
, fd
));
433 if (abfd
!= NULL
&& !gdb_bfd_has_target_filename (abfd
.get ()))
434 bfd_set_cacheable (abfd
.get (), 1);
438 /* Arrange to free PATHNAME when the error is thrown. */
439 error (_("Could not open `%s' as an executable file: %s"),
440 pathname
, bfd_errmsg (bfd_get_error ()));
446 /* Find shared library PATHNAME and open a BFD for it. */
449 solib_bfd_open (const char *pathname
)
452 const struct bfd_arch_info
*b
;
454 /* Search for shared library file. */
455 gdb::unique_xmalloc_ptr
<char> found_pathname
456 = solib_find (pathname
, &found_file
);
457 if (found_pathname
== NULL
)
459 /* Return failure if the file could not be found, so that we can
460 accumulate messages about missing libraries. */
464 perror_with_name (pathname
);
467 /* Open bfd for shared library. */
468 gdb_bfd_ref_ptr
abfd (solib_bfd_fopen (found_pathname
.get (), found_file
));
470 /* Check bfd format. */
471 if (!bfd_check_format (abfd
.get (), bfd_object
))
472 error (_("`%s': not in executable format: %s"),
473 bfd_get_filename (abfd
.get ()), bfd_errmsg (bfd_get_error ()));
475 /* Check bfd arch. */
476 b
= gdbarch_bfd_arch_info (target_gdbarch ());
477 if (!b
->compatible (b
, bfd_get_arch_info (abfd
.get ())))
478 error (_("`%s': Shared library architecture %s is not compatible "
479 "with target architecture %s."), bfd_get_filename (abfd
.get ()),
480 bfd_get_arch_info (abfd
.get ())->printable_name
,
486 /* Mapping of a core file's shared library sonames to their respective
487 build-ids. Added to the registries of core file bfds. */
489 typedef std::unordered_map
<std::string
, std::string
> soname_build_id_map
;
491 /* Key used to associate a soname_build_id_map to a core file bfd. */
493 static const struct registry
<bfd
>::key
<soname_build_id_map
>
494 cbfd_soname_build_id_data_key
;
499 set_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
,
501 const bfd_build_id
*build_id
)
503 gdb_assert (abfd
.get () != nullptr);
504 gdb_assert (soname
!= nullptr);
505 gdb_assert (build_id
!= nullptr);
507 soname_build_id_map
*mapptr
= cbfd_soname_build_id_data_key
.get (abfd
.get ());
509 if (mapptr
== nullptr)
510 mapptr
= cbfd_soname_build_id_data_key
.emplace (abfd
.get ());
512 (*mapptr
)[soname
] = build_id_to_string (build_id
);
517 gdb::unique_xmalloc_ptr
<char>
518 get_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
, const char *soname
)
520 if (abfd
.get () == nullptr || soname
== nullptr)
523 soname_build_id_map
*mapptr
524 = cbfd_soname_build_id_data_key
.get (abfd
.get ());
526 if (mapptr
== nullptr)
529 auto it
= mapptr
->find (lbasename (soname
));
530 if (it
== mapptr
->end ())
533 return make_unique_xstrdup (it
->second
.c_str ());
536 /* Given a pointer to one of the shared objects in our list of mapped
537 objects, use the recorded name to open a bfd descriptor for the
538 object, build a section table, relocate all the section addresses
539 by the base address at which the shared object was mapped, and then
540 add the sections to the target's section table.
542 FIXME: In most (all?) cases the shared object file name recorded in
543 the dynamic linkage tables will be a fully qualified pathname. For
544 cases where it isn't, do we really mimic the systems search
545 mechanism correctly in the below code (particularly the tilde
546 expansion stuff?). */
549 solib_map_sections (struct so_list
*so
)
551 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
553 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (so
->so_name
));
554 gdb_bfd_ref_ptr
abfd (ops
->bfd_open (filename
.get ()));
555 gdb::unique_xmalloc_ptr
<char> build_id_hexstr
556 = get_cbfd_soname_build_id (current_program_space
->cbfd
, so
->so_name
);
558 /* If we already know the build-id of this solib from a core file, verify
559 it matches ABFD's build-id. If there is a mismatch or the solib wasn't
560 found, attempt to query debuginfod for the correct solib. */
561 if (build_id_hexstr
.get () != nullptr)
563 bool mismatch
= false;
565 if (abfd
!= nullptr && abfd
->build_id
!= nullptr)
567 std::string build_id
= build_id_to_string (abfd
->build_id
);
569 if (build_id
!= build_id_hexstr
.get ())
572 if (abfd
== nullptr || mismatch
)
574 scoped_fd fd
= debuginfod_exec_query ((const unsigned char*)
575 build_id_hexstr
.get (),
576 0, so
->so_name
, &filename
);
579 abfd
= ops
->bfd_open (filename
.get ());
581 warning (_("Build-id of %ps does not match core file."),
582 styled_string (file_name_style
.style (), filename
.get ()));
589 /* Leave bfd open, core_xfer_memory and "info files" need it. */
590 so
->abfd
= abfd
.release ();
592 /* Copy the full path name into so_name, allowing symbol_file_add
593 to find it later. This also affects the =library-loaded GDB/MI
594 event, and in particular the part of that notification providing
595 the library's host-side path. If we let the target dictate
596 that objfile's path, and the target is different from the host,
597 GDB/MI will not provide the correct host-side path. */
598 if (strlen (bfd_get_filename (so
->abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
599 error (_("Shared library file name is too long."));
600 strcpy (so
->so_name
, bfd_get_filename (so
->abfd
));
602 if (so
->sections
== nullptr)
603 so
->sections
= new target_section_table
;
604 *so
->sections
= build_section_table (so
->abfd
);
606 for (target_section
&p
: *so
->sections
)
608 /* Relocate the section binding addresses as recorded in the shared
609 object's file by the base address to which the object was actually
611 ops
->relocate_section_addresses (so
, &p
);
613 /* If the target didn't provide information about the address
614 range of the shared object, assume we want the location of
615 the .text section. */
616 if (so
->addr_low
== 0 && so
->addr_high
== 0
617 && strcmp (p
.the_bfd_section
->name
, ".text") == 0)
619 so
->addr_low
= p
.addr
;
620 so
->addr_high
= p
.endaddr
;
624 /* Add the shared object's sections to the current set of file
625 section tables. Do this immediately after mapping the object so
626 that later nodes in the list can query this object, as is needed
628 current_program_space
->add_target_sections (so
, *so
->sections
);
633 /* Free symbol-file related contents of SO and reset for possible reloading
634 of SO. If we have opened a BFD for SO, close it. If we have placed SO's
635 sections in some target's section table, the caller is responsible for
638 This function doesn't mess with objfiles at all. If there is an
639 objfile associated with SO that needs to be removed, the caller is
640 responsible for taking care of that. */
643 clear_so (struct so_list
*so
)
645 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
650 gdb_bfd_unref (so
->abfd
);
653 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
654 so
->symbols_loaded
= 0;
657 so
->addr_low
= so
->addr_high
= 0;
659 /* Restore the target-supplied file name. SO_NAME may be the path
660 of the symbol file. */
661 strcpy (so
->so_name
, so
->so_original_name
);
663 /* Do the same for target-specific data. */
664 if (ops
->clear_so
!= NULL
)
668 /* Free the storage associated with the `struct so_list' object SO.
669 If we have opened a BFD for SO, close it.
671 The caller is responsible for removing SO from whatever list it is
672 a member of. If we have placed SO's sections in some target's
673 section table, the caller is responsible for removing them.
675 This function doesn't mess with objfiles at all. If there is an
676 objfile associated with SO that needs to be removed, the caller is
677 responsible for taking care of that. */
680 free_so (struct so_list
*so
)
682 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
691 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
692 be chatty about it. Return true if any symbols were actually loaded. */
695 solib_read_symbols (struct so_list
*so
, symfile_add_flags flags
)
697 if (so
->symbols_loaded
)
699 /* If needed, we've already warned in our caller. */
701 else if (so
->abfd
== NULL
)
703 /* We've already warned about this library, when trying to open
709 flags
|= current_inferior ()->symfile_flags
;
713 /* Have we already loaded this shared object? */
714 so
->objfile
= nullptr;
715 for (objfile
*objfile
: current_program_space
->objfiles ())
717 if (filename_cmp (objfile_name (objfile
), so
->so_name
) == 0
718 && objfile
->addr_low
== so
->addr_low
)
720 so
->objfile
= objfile
;
724 if (so
->objfile
== NULL
)
726 section_addr_info sap
727 = build_section_addr_info_from_section_table (*so
->sections
);
728 gdb_bfd_ref_ptr tmp_bfd
729 (gdb_bfd_ref_ptr::new_reference (so
->abfd
));
730 so
->objfile
= symbol_file_add_from_bfd (tmp_bfd
, so
->so_name
,
733 so
->objfile
->addr_low
= so
->addr_low
;
736 so
->symbols_loaded
= 1;
738 catch (const gdb_exception_error
&e
)
740 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
741 " library symbols for %s:\n"),
751 /* Return true if KNOWN->objfile is used by any other so_list object
752 in the list of shared libraries. Return false otherwise. */
755 solib_used (const struct so_list
*const known
)
757 for (const struct so_list
*pivot
: current_program_space
->solibs ())
758 if (pivot
!= known
&& pivot
->objfile
== known
->objfile
)
763 /* Notify interpreters and observers that solib SO has been loaded. */
766 notify_solib_loaded (so_list
*so
)
768 interps_notify_solib_loaded (so
);
769 gdb::observers::solib_loaded
.notify (so
);
772 /* Notify interpreters and observers that solib SO has been unloaded. */
775 notify_solib_unloaded (so_list
*so
)
777 interps_notify_solib_unloaded (so
);
778 gdb::observers::solib_unloaded
.notify (so
);
784 update_solib_list (int from_tty
)
786 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
787 struct so_list
*inferior
= ops
->current_sos();
788 struct so_list
*gdb
, **gdb_link
;
790 /* We can reach here due to changing solib-search-path or the
791 sysroot, before having any inferior. */
792 if (target_has_execution () && inferior_ptid
!= null_ptid
)
794 struct inferior
*inf
= current_inferior ();
796 /* If we are attaching to a running process for which we
797 have not opened a symbol file, we may be able to get its
800 && current_program_space
->symfile_object_file
== NULL
)
804 ops
->open_symbol_file_object (from_tty
);
806 catch (const gdb_exception_error
&ex
)
808 exception_fprintf (gdb_stderr
, ex
,
809 "Error reading attached "
810 "process's symbol file.\n");
815 /* GDB and the inferior's dynamic linker each maintain their own
816 list of currently loaded shared objects; we want to bring the
817 former in sync with the latter. Scan both lists, seeing which
818 shared objects appear where. There are three cases:
820 - A shared object appears on both lists. This means that GDB
821 knows about it already, and it's still loaded in the inferior.
822 Nothing needs to happen.
824 - A shared object appears only on GDB's list. This means that
825 the inferior has unloaded it. We should remove the shared
826 object from GDB's tables.
828 - A shared object appears only on the inferior's list. This
829 means that it's just been loaded. We should add it to GDB's
832 So we walk GDB's list, checking each entry to see if it appears
833 in the inferior's list too. If it does, no action is needed, and
834 we remove it from the inferior's list. If it doesn't, the
835 inferior has unloaded it, and we remove it from GDB's list. By
836 the time we're done walking GDB's list, the inferior's list
837 contains only the new shared objects, which we then add. */
839 gdb
= current_program_space
->so_list
;
840 gdb_link
= ¤t_program_space
->so_list
;
843 struct so_list
*i
= inferior
;
844 struct so_list
**i_link
= &inferior
;
846 /* Check to see whether the shared object *gdb also appears in
847 the inferior's current list. */
852 if (ops
->same (gdb
, i
))
857 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
865 /* If the shared object appears on the inferior's list too, then
866 it's still loaded, so we don't need to do anything. Delete
867 it from the inferior's list, and leave it on GDB's list. */
872 gdb_link
= &gdb
->next
;
876 /* If it's not on the inferior's list, remove it from GDB's tables. */
879 /* Notify any observer that the shared object has been
880 unloaded before we remove it from GDB's tables. */
881 notify_solib_unloaded (gdb
);
883 current_program_space
->deleted_solibs
.push_back (gdb
->so_name
);
885 *gdb_link
= gdb
->next
;
887 /* Unless the user loaded it explicitly, free SO's objfile. */
888 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
)
889 && !solib_used (gdb
))
890 gdb
->objfile
->unlink ();
892 /* Some targets' section tables might be referring to
893 sections from so->abfd; remove them. */
894 current_program_space
->remove_target_sections (gdb
);
901 /* Now the inferior's list contains only shared objects that don't
902 appear in GDB's list --- those that are newly loaded. Add them
903 to GDB's shared object list. */
907 const char *not_found_filename
= NULL
;
911 /* Add the new shared objects to GDB's list. */
912 *gdb_link
= inferior
;
914 /* Fill in the rest of each of the `struct so_list' nodes. */
915 for (i
= inferior
; i
; i
= i
->next
)
918 i
->pspace
= current_program_space
;
919 current_program_space
->added_solibs
.push_back (i
);
923 /* Fill in the rest of the `struct so_list' node. */
924 if (!solib_map_sections (i
))
927 if (not_found_filename
== NULL
)
928 not_found_filename
= i
->so_original_name
;
932 catch (const gdb_exception_error
&e
)
934 exception_fprintf (gdb_stderr
, e
,
935 _("Error while mapping shared "
936 "library sections:\n"));
939 /* Notify any observer that the shared object has been
940 loaded now that we've added it to GDB's tables. */
941 notify_solib_loaded (i
);
944 /* If a library was not found, issue an appropriate warning
945 message. We have to use a single call to warning in case the
946 front end does something special with warnings, e.g., pop up
947 a dialog box. It Would Be Nice if we could get a "warning: "
948 prefix on each line in the CLI front end, though - it doesn't
952 warning (_("Could not load shared library symbols for %s.\n"
953 "Do you need \"set solib-search-path\" "
954 "or \"set sysroot\"?"),
956 else if (not_found
> 1)
958 Could not load shared library symbols for %d libraries, e.g. %s.\n\
959 Use the \"info sharedlibrary\" command to see the complete listing.\n\
960 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
961 not_found
, not_found_filename
);
966 /* Return non-zero if NAME is the libpthread shared library.
968 Uses a fairly simplistic heuristic approach where we check
969 the file name against "/libpthread". This can lead to false
970 positives, but this should be good enough in practice.
972 As of glibc-2.34, functions formerly residing in libpthread have
973 been moved to libc, so "/libc." needs to be checked too. (Matching
974 the "." will avoid matching libraries such as libcrypt.) */
977 libpthread_name_p (const char *name
)
979 return (strstr (name
, "/libpthread") != NULL
980 || strstr (name
, "/libc.") != NULL
);
983 /* Return non-zero if SO is the libpthread shared library. */
986 libpthread_solib_p (struct so_list
*so
)
988 return libpthread_name_p (so
->so_name
);
991 /* Read in symbolic information for any shared objects whose names
992 match PATTERN. (If we've already read a shared object's symbol
993 info, leave it alone.) If PATTERN is zero, read them all.
995 If READSYMS is 0, defer reading symbolic information until later
996 but still do any needed low level processing.
998 FROM_TTY is described for update_solib_list, above. */
1001 solib_add (const char *pattern
, int from_tty
, int readsyms
)
1003 if (print_symbol_loading_p (from_tty
, 0, 0))
1005 if (pattern
!= NULL
)
1007 gdb_printf (_("Loading symbols for shared libraries: %s\n"),
1011 gdb_printf (_("Loading symbols for shared libraries.\n"));
1014 current_program_space
->solib_add_generation
++;
1018 char *re_err
= re_comp (pattern
);
1021 error (_("Invalid regexp: %s"), re_err
);
1024 update_solib_list (from_tty
);
1026 /* Walk the list of currently loaded shared libraries, and read
1027 symbols for any that match the pattern --- or any whose symbols
1028 aren't already loaded, if no pattern was given. */
1030 bool any_matches
= false;
1031 bool loaded_any_symbols
= false;
1032 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1035 add_flags
|= SYMFILE_VERBOSE
;
1037 for (struct so_list
*gdb
: current_program_space
->solibs ())
1038 if (! pattern
|| re_exec (gdb
->so_name
))
1040 /* Normally, we would read the symbols from that library
1041 only if READSYMS is set. However, we're making a small
1042 exception for the pthread library, because we sometimes
1043 need the library symbols to be loaded in order to provide
1044 thread support (x86-linux for instance). */
1045 const int add_this_solib
=
1046 (readsyms
|| libpthread_solib_p (gdb
));
1051 if (gdb
->symbols_loaded
)
1053 /* If no pattern was given, be quiet for shared
1054 libraries we have already loaded. */
1055 if (pattern
&& (from_tty
|| info_verbose
))
1056 gdb_printf (_("Symbols already loaded for %s\n"),
1059 else if (solib_read_symbols (gdb
, add_flags
))
1060 loaded_any_symbols
= true;
1064 if (loaded_any_symbols
)
1065 breakpoint_re_set ();
1067 if (from_tty
&& pattern
&& ! any_matches
)
1069 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
1071 if (loaded_any_symbols
)
1073 /* Getting new symbols may change our opinion about what is
1075 reinit_frame_cache ();
1080 /* Implement the "info sharedlibrary" command. Walk through the
1081 shared library list and print information about each attached
1082 library matching PATTERN. If PATTERN is elided, print them
1086 info_sharedlibrary_command (const char *pattern
, int from_tty
)
1088 bool so_missing_debug_info
= false;
1091 struct gdbarch
*gdbarch
= target_gdbarch ();
1092 struct ui_out
*uiout
= current_uiout
;
1096 char *re_err
= re_comp (pattern
);
1099 error (_("Invalid regexp: %s"), re_err
);
1102 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1103 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1105 update_solib_list (from_tty
);
1107 /* ui_out_emit_table table_emitter needs to know the number of rows,
1108 so we need to make two passes over the libs. */
1111 for (struct so_list
*so
: current_program_space
->solibs ())
1115 if (pattern
&& ! re_exec (so
->so_name
))
1122 ui_out_emit_table
table_emitter (uiout
, 4, nr_libs
, "SharedLibraryTable");
1124 /* The "- 1" is because ui_out adds one space between columns. */
1125 uiout
->table_header (addr_width
- 1, ui_left
, "from", "From");
1126 uiout
->table_header (addr_width
- 1, ui_left
, "to", "To");
1127 uiout
->table_header (12 - 1, ui_left
, "syms-read", "Syms Read");
1128 uiout
->table_header (0, ui_noalign
, "name", "Shared Object Library");
1130 uiout
->table_body ();
1132 for (struct so_list
*so
: current_program_space
->solibs ())
1134 if (! so
->so_name
[0])
1136 if (pattern
&& ! re_exec (so
->so_name
))
1139 ui_out_emit_tuple
tuple_emitter (uiout
, "lib");
1141 if (so
->addr_high
!= 0)
1143 uiout
->field_core_addr ("from", gdbarch
, so
->addr_low
);
1144 uiout
->field_core_addr ("to", gdbarch
, so
->addr_high
);
1148 uiout
->field_skip ("from");
1149 uiout
->field_skip ("to");
1152 if (! top_level_interpreter ()->interp_ui_out ()->is_mi_like_p ()
1153 && so
->symbols_loaded
1154 && !objfile_has_symbols (so
->objfile
))
1156 so_missing_debug_info
= true;
1157 uiout
->field_string ("syms-read", "Yes (*)");
1160 uiout
->field_string ("syms-read", so
->symbols_loaded
? "Yes" : "No");
1162 uiout
->field_string ("name", so
->so_name
, file_name_style
.style ());
1171 uiout
->message (_("No shared libraries matched.\n"));
1173 uiout
->message (_("No shared libraries loaded at this time.\n"));
1177 if (so_missing_debug_info
)
1178 uiout
->message (_("(*): Shared library is missing "
1179 "debugging information.\n"));
1186 solib_contains_address_p (const struct so_list
*const solib
,
1189 if (solib
->sections
== nullptr)
1192 for (target_section
&p
: *solib
->sections
)
1193 if (p
.addr
<= address
&& address
< p
.endaddr
)
1199 /* If ADDRESS is in a shared lib in program space PSPACE, return its
1202 Provides a hook for other gdb routines to discover whether or not a
1203 particular address is within the mapped address space of a shared
1206 For example, this routine is called at one point to disable
1207 breakpoints which are in shared libraries that are not currently
1211 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1213 struct so_list
*so
= NULL
;
1215 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1216 if (solib_contains_address_p (so
, address
))
1217 return (so
->so_name
);
1225 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1227 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
1229 if (ops
->keep_data_in_core
)
1230 return ops
->keep_data_in_core (vaddr
, size
) != 0;
1235 /* Called by free_all_symtabs */
1240 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
1242 disable_breakpoints_in_shlibs ();
1244 while (current_program_space
->so_list
)
1246 struct so_list
*so
= current_program_space
->so_list
;
1248 current_program_space
->so_list
= so
->next
;
1249 notify_solib_unloaded (so
);
1250 current_program_space
->remove_target_sections (so
);
1254 ops
->clear_solib ();
1257 /* Shared library startup support. When GDB starts up the inferior,
1258 it nurses it along (through the shell) until it is ready to execute
1259 its first instruction. At this point, this function gets
1263 solib_create_inferior_hook (int from_tty
)
1265 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
1267 ops
->solib_create_inferior_hook (from_tty
);
1273 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1275 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
1277 return ops
->in_dynsym_resolve_code (pc
) != 0;
1280 /* Implements the "sharedlibrary" command. */
1283 sharedlibrary_command (const char *args
, int from_tty
)
1286 solib_add (args
, from_tty
, 1);
1289 /* Implements the command "nosharedlibrary", which discards symbols
1290 that have been auto-loaded from shared libraries. Symbols from
1291 shared libraries that were added by explicit request of the user
1292 are not discarded. Also called from remote.c. */
1295 no_shared_libraries (const char *ignored
, int from_tty
)
1297 /* The order of the two routines below is important: clear_solib notifies
1298 the solib_unloaded observers, and some of these observers might need
1299 access to their associated objfiles. Therefore, we can not purge the
1300 solibs' objfiles before clear_solib has been called. */
1303 objfile_purge_solibs ();
1309 update_solib_breakpoints (void)
1311 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
1313 if (ops
->update_breakpoints
!= NULL
)
1314 ops
->update_breakpoints ();
1320 handle_solib_event (void)
1322 const struct target_so_ops
*ops
= gdbarch_so_ops (target_gdbarch ());
1324 if (ops
->handle_event
!= NULL
)
1325 ops
->handle_event ();
1327 current_inferior ()->pspace
->clear_solib_cache ();
1329 /* Check for any newly added shared libraries if we're supposed to
1330 be adding them automatically. Switch terminal for any messages
1331 produced by breakpoint_re_set. */
1332 target_terminal::ours_for_output ();
1333 solib_add (NULL
, 0, auto_solib_add
);
1334 target_terminal::inferior ();
1337 /* Reload shared libraries, but avoid reloading the same symbol file
1338 we already have loaded. */
1341 reload_shared_libraries_1 (int from_tty
)
1343 if (print_symbol_loading_p (from_tty
, 0, 0))
1344 gdb_printf (_("Loading symbols for shared libraries.\n"));
1346 for (struct so_list
*so
: current_program_space
->solibs ())
1348 const char *found_pathname
= NULL
;
1349 bool was_loaded
= so
->symbols_loaded
!= 0;
1350 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1353 add_flags
|= SYMFILE_VERBOSE
;
1355 gdb::unique_xmalloc_ptr
<char> filename
1356 (tilde_expand (so
->so_original_name
));
1357 gdb_bfd_ref_ptr
abfd (solib_bfd_open (filename
.get ()));
1359 found_pathname
= bfd_get_filename (abfd
.get ());
1361 /* If this shared library is no longer associated with its previous
1362 symbol file, close that. */
1363 if ((found_pathname
== NULL
&& was_loaded
)
1364 || (found_pathname
!= NULL
1365 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1367 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
)
1368 && !solib_used (so
))
1369 so
->objfile
->unlink ();
1370 current_program_space
->remove_target_sections (so
);
1374 /* If this shared library is now associated with a new symbol
1376 if (found_pathname
!= NULL
1378 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1380 bool got_error
= false;
1384 solib_map_sections (so
);
1387 catch (const gdb_exception_error
&e
)
1389 exception_fprintf (gdb_stderr
, e
,
1390 _("Error while mapping "
1391 "shared library sections:\n"));
1396 && (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
)))
1397 solib_read_symbols (so
, add_flags
);
1403 reload_shared_libraries (const char *ignored
, int from_tty
,
1404 struct cmd_list_element
*e
)
1406 const struct target_so_ops
*ops
;
1408 reload_shared_libraries_1 (from_tty
);
1410 ops
= gdbarch_so_ops (target_gdbarch ());
1412 /* Creating inferior hooks here has two purposes. First, if we reload
1413 shared libraries then the address of solib breakpoint we've computed
1414 previously might be no longer valid. For example, if we forgot to set
1415 solib-absolute-prefix and are setting it right now, then the previous
1416 breakpoint address is plain wrong. Second, installing solib hooks
1417 also implicitly figures were ld.so is and loads symbols for it.
1418 Absent this call, if we've just connected to a target and set
1419 solib-absolute-prefix or solib-search-path, we'll lose all information
1421 if (target_has_execution ())
1423 /* Reset or free private data structures not associated with
1425 ops
->clear_solib ();
1427 /* Remove any previous solib event breakpoint. This is usually
1428 done in common code, at breakpoint_init_inferior time, but
1429 we're not really starting up the inferior here. */
1430 remove_solib_event_breakpoints ();
1432 solib_create_inferior_hook (from_tty
);
1435 /* Sometimes the platform-specific hook loads initial shared
1436 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1437 incorrectly 0 but such solib targets should be fixed anyway. If we
1438 made all the inferior hook methods consistent, this call could be
1439 removed. Call it only after the solib target has been initialized by
1440 solib_create_inferior_hook. */
1442 solib_add (NULL
, 0, auto_solib_add
);
1444 breakpoint_re_set ();
1446 /* We may have loaded or unloaded debug info for some (or all)
1447 shared libraries. However, frames may still reference them. For
1448 example, a frame's unwinder might still point at DWARF FDE
1449 structures that are now freed. Also, getting new symbols may
1450 change our opinion about what is frameless. */
1451 reinit_frame_cache ();
1454 /* Wrapper for reload_shared_libraries that replaces "remote:"
1455 at the start of gdb_sysroot with "target:". */
1458 gdb_sysroot_changed (const char *ignored
, int from_tty
,
1459 struct cmd_list_element
*e
)
1461 const char *old_prefix
= "remote:";
1462 const char *new_prefix
= TARGET_SYSROOT_PREFIX
;
1464 if (startswith (gdb_sysroot
.c_str (), old_prefix
))
1466 static bool warning_issued
= false;
1468 gdb_assert (strlen (old_prefix
) == strlen (new_prefix
));
1469 gdb_sysroot
= new_prefix
+ gdb_sysroot
.substr (strlen (old_prefix
));
1471 if (!warning_issued
)
1473 warning (_("\"%s\" is deprecated, use \"%s\" instead."),
1474 old_prefix
, new_prefix
);
1475 warning (_("sysroot set to \"%s\"."), gdb_sysroot
.c_str ());
1477 warning_issued
= true;
1481 reload_shared_libraries (ignored
, from_tty
, e
);
1485 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1486 struct cmd_list_element
*c
, const char *value
)
1488 gdb_printf (file
, _("Autoloading of shared library symbols is %s.\n"),
1493 /* Lookup the value for a specific symbol from dynamic symbol table. Look
1494 up symbol from ABFD. MATCH_SYM is a callback function to determine
1495 whether to pick up a symbol. DATA is the input of this callback
1496 function. Return 0 if symbol is not found. */
1499 gdb_bfd_lookup_symbol_from_symtab
1500 (bfd
*abfd
, gdb::function_view
<bool (const asymbol
*)> match_sym
)
1502 long storage_needed
= bfd_get_symtab_upper_bound (abfd
);
1503 CORE_ADDR symaddr
= 0;
1505 if (storage_needed
> 0)
1509 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1510 asymbol
**symbol_table
= storage
.data ();
1511 unsigned int number_of_symbols
=
1512 bfd_canonicalize_symtab (abfd
, symbol_table
);
1514 for (i
= 0; i
< number_of_symbols
; i
++)
1516 asymbol
*sym
= *symbol_table
++;
1518 if (match_sym (sym
))
1520 struct gdbarch
*gdbarch
= target_gdbarch ();
1521 symaddr
= sym
->value
;
1523 /* Some ELF targets fiddle with addresses of symbols they
1524 consider special. They use minimal symbols to do that
1525 and this is needed for correct breakpoint placement,
1526 but we do not have full data here to build a complete
1527 minimal symbol, so just set the address and let the
1528 targets cope with that. */
1529 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1530 && gdbarch_elf_make_msymbol_special_p (gdbarch
))
1532 struct minimal_symbol msym
{};
1534 msym
.set_value_address (symaddr
);
1535 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, &msym
);
1536 symaddr
= CORE_ADDR (msym
.unrelocated_address ());
1539 /* BFD symbols are section relative. */
1540 symaddr
+= sym
->section
->vma
;
1552 gdb_bfd_scan_elf_dyntag (const int desired_dyntag
, bfd
*abfd
, CORE_ADDR
*ptr
,
1553 CORE_ADDR
*ptr_addr
)
1555 int arch_size
, step
, sect_size
;
1556 long current_dyntag
;
1557 CORE_ADDR dyn_ptr
, dyn_addr
;
1558 gdb_byte
*bufend
, *bufstart
, *buf
;
1559 Elf32_External_Dyn
*x_dynp_32
;
1560 Elf64_External_Dyn
*x_dynp_64
;
1561 struct bfd_section
*sect
;
1566 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
1569 arch_size
= bfd_get_arch_size (abfd
);
1570 if (arch_size
== -1)
1573 /* Find the start address of the .dynamic section. */
1574 sect
= bfd_get_section_by_name (abfd
, ".dynamic");
1579 for (const target_section
&target_section
1580 : current_program_space
->target_sections ())
1581 if (sect
== target_section
.the_bfd_section
)
1583 dyn_addr
= target_section
.addr
;
1589 /* ABFD may come from OBJFILE acting only as a symbol file without being
1590 loaded into the target (see add_symbol_file_command). This case is
1591 such fallback to the file VMA address without the possibility of
1592 having the section relocated to its actual in-memory address. */
1594 dyn_addr
= bfd_section_vma (sect
);
1597 /* Read in .dynamic from the BFD. We will get the actual value
1598 from memory later. */
1599 sect_size
= bfd_section_size (sect
);
1600 buf
= bufstart
= (gdb_byte
*) alloca (sect_size
);
1601 if (!bfd_get_section_contents (abfd
, sect
,
1605 /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
1606 step
= (arch_size
== 32) ? sizeof (Elf32_External_Dyn
)
1607 : sizeof (Elf64_External_Dyn
);
1608 for (bufend
= buf
+ sect_size
;
1612 if (arch_size
== 32)
1614 x_dynp_32
= (Elf32_External_Dyn
*) buf
;
1615 current_dyntag
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_tag
);
1616 dyn_ptr
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_un
.d_ptr
);
1620 x_dynp_64
= (Elf64_External_Dyn
*) buf
;
1621 current_dyntag
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_tag
);
1622 dyn_ptr
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_un
.d_ptr
);
1624 if (current_dyntag
== DT_NULL
)
1626 if (current_dyntag
== desired_dyntag
)
1628 /* If requested, try to read the runtime value of this .dynamic
1632 struct type
*ptr_type
;
1633 gdb_byte ptr_buf
[8];
1634 CORE_ADDR ptr_addr_1
;
1636 ptr_type
= builtin_type (target_gdbarch ())->builtin_data_ptr
;
1637 ptr_addr_1
= dyn_addr
+ (buf
- bufstart
) + arch_size
/ 8;
1638 if (target_read_memory (ptr_addr_1
, ptr_buf
, arch_size
/ 8) == 0)
1639 dyn_ptr
= extract_typed_address (ptr_buf
, ptr_type
);
1642 *ptr_addr
= dyn_addr
+ (buf
- bufstart
);
1653 gdb::unique_xmalloc_ptr
<char>
1654 gdb_bfd_read_elf_soname (const char *filename
)
1656 gdb_bfd_ref_ptr abfd
= gdb_bfd_open (filename
, gnutarget
);
1658 if (abfd
== nullptr)
1661 /* Check that ABFD is an ET_DYN ELF file. */
1662 if (!bfd_check_format (abfd
.get (), bfd_object
)
1663 || !(bfd_get_file_flags (abfd
.get ()) & DYNAMIC
))
1667 if (!gdb_bfd_scan_elf_dyntag (DT_SONAME
, abfd
.get (), &idx
, nullptr))
1670 struct bfd_section
*dynstr
= bfd_get_section_by_name (abfd
.get (), ".dynstr");
1671 int sect_size
= bfd_section_size (dynstr
);
1672 if (dynstr
== nullptr || sect_size
<= idx
)
1675 /* Read soname from the string table. */
1676 gdb::byte_vector dynstr_buf
;
1677 if (!gdb_bfd_get_full_section_contents (abfd
.get (), dynstr
, &dynstr_buf
))
1680 /* Ensure soname is null-terminated before returning a copy. */
1681 char *soname
= (char *) dynstr_buf
.data () + idx
;
1682 if (strnlen (soname
, sect_size
- idx
) == sect_size
- idx
)
1685 return make_unique_xstrdup (soname
);
1688 /* Lookup the value for a specific symbol from symbol table. Look up symbol
1689 from ABFD. MATCH_SYM is a callback function to determine whether to pick
1690 up a symbol. DATA is the input of this callback function. Return 0
1691 if symbol is not found. */
1694 bfd_lookup_symbol_from_dyn_symtab
1695 (bfd
*abfd
, gdb::function_view
<bool (const asymbol
*)> match_sym
)
1697 long storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
1698 CORE_ADDR symaddr
= 0;
1700 if (storage_needed
> 0)
1703 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1704 asymbol
**symbol_table
= storage
.data ();
1705 unsigned int number_of_symbols
=
1706 bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
1708 for (i
= 0; i
< number_of_symbols
; i
++)
1710 asymbol
*sym
= *symbol_table
++;
1712 if (match_sym (sym
))
1714 /* BFD symbols are section relative. */
1715 symaddr
= sym
->value
+ sym
->section
->vma
;
1723 /* Lookup the value for a specific symbol from symbol table and dynamic
1724 symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
1725 function to determine whether to pick up a symbol. DATA is the
1726 input of this callback function. Return 0 if symbol is not
1730 gdb_bfd_lookup_symbol
1731 (bfd
*abfd
, gdb::function_view
<bool (const asymbol
*)> match_sym
)
1733 CORE_ADDR symaddr
= gdb_bfd_lookup_symbol_from_symtab (abfd
, match_sym
);
1735 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
1736 have to check the dynamic string table too. */
1738 symaddr
= bfd_lookup_symbol_from_dyn_symtab (abfd
, match_sym
);
1743 /* The shared library list may contain user-loaded object files that
1744 can be removed out-of-band by the user. So upon notification of
1745 free_objfile remove all references to any user-loaded file that is
1746 about to be freed. */
1749 remove_user_added_objfile (struct objfile
*objfile
)
1751 if (objfile
!= 0 && objfile
->flags
& OBJF_USERLOADED
)
1753 for (struct so_list
*so
: current_program_space
->solibs ())
1754 if (so
->objfile
== objfile
)
1759 void _initialize_solib ();
1761 _initialize_solib ()
1763 gdb::observers::free_objfile
.attach (remove_user_added_objfile
,
1765 gdb::observers::inferior_execd
.attach ([] (inferior
*exec_inf
,
1766 inferior
*follow_inf
)
1768 solib_create_inferior_hook (0);
1771 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1772 _("Load shared object library symbols for files matching REGEXP."));
1773 cmd_list_element
*info_sharedlibrary_cmd
1774 = add_info ("sharedlibrary", info_sharedlibrary_command
,
1775 _("Status of loaded shared object libraries."));
1776 add_info_alias ("dll", info_sharedlibrary_cmd
, 1);
1777 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1778 _("Unload all shared object library symbols."));
1780 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1781 &auto_solib_add
, _("\
1782 Set autoloading of shared library symbols."), _("\
1783 Show autoloading of shared library symbols."), _("\
1784 If \"on\", symbols from all shared object libraries will be loaded\n\
1785 automatically when the inferior begins execution, when the dynamic linker\n\
1786 informs gdb that a new library has been loaded, or when attaching to the\n\
1787 inferior. Otherwise, symbols must be loaded manually, using \
1790 show_auto_solib_add
,
1791 &setlist
, &showlist
);
1793 set_show_commands sysroot_cmds
1794 = add_setshow_optional_filename_cmd ("sysroot", class_support
,
1796 Set an alternate system root."), _("\
1797 Show the current system root."), _("\
1798 The system root is used to load absolute shared library symbol files.\n\
1799 For other (relative) files, you can add directories using\n\
1800 `set solib-search-path'."),
1801 gdb_sysroot_changed
,
1803 &setlist
, &showlist
);
1805 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.set
, class_support
, 0,
1807 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.show
, class_support
, 0,
1810 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1811 &solib_search_path
, _("\
1812 Set the search path for loading non-absolute shared library symbol files."),
1814 Show the search path for loading non-absolute shared library symbol files."),
1816 This takes precedence over the environment variables \
1817 PATH and LD_LIBRARY_PATH."),
1818 reload_shared_libraries
,
1819 show_solib_search_path
,
1820 &setlist
, &showlist
);
1822 add_setshow_boolean_cmd ("solib", class_maintenance
,
1824 Set solib debugging."), _("\
1825 Show solib debugging."), _("\
1826 When true, solib-related debugging output is enabled."),
1828 &setdebuglist
, &showdebuglist
);