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"
52 #include "gdbsupport/scoped_fd.h"
53 #include "debuginfod-support.h"
55 #include "cli/cli-style.h"
57 /* Architecture-specific operations. */
59 /* Per-architecture data key. */
60 static struct gdbarch_data
*solib_data
;
63 solib_init (struct obstack
*obstack
)
65 struct target_so_ops
**ops
;
67 ops
= OBSTACK_ZALLOC (obstack
, struct target_so_ops
*);
68 *ops
= current_target_so_ops
;
72 static const struct target_so_ops
*
73 solib_ops (struct gdbarch
*gdbarch
)
75 const struct target_so_ops
**ops
76 = (const struct target_so_ops
**) gdbarch_data (gdbarch
, solib_data
);
81 /* Set the solib operations for GDBARCH to NEW_OPS. */
84 set_solib_ops (struct gdbarch
*gdbarch
, const struct target_so_ops
*new_ops
)
86 const struct target_so_ops
**ops
87 = (const struct target_so_ops
**) gdbarch_data (gdbarch
, solib_data
);
93 /* external data declarations */
95 /* FIXME: gdbarch needs to control this variable, or else every
96 configuration needs to call set_solib_ops. */
97 struct target_so_ops
*current_target_so_ops
;
99 /* Local function prototypes */
101 /* If non-empty, this is a search path for loading non-absolute shared library
102 symbol files. This takes precedence over the environment variables PATH
103 and LD_LIBRARY_PATH. */
104 static std::string solib_search_path
;
106 show_solib_search_path (struct ui_file
*file
, int from_tty
,
107 struct cmd_list_element
*c
, const char *value
)
109 gdb_printf (file
, _("The search path for loading non-absolute "
110 "shared library symbol files is %s.\n"),
114 /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
115 #if (HAVE_DOS_BASED_FILE_SYSTEM)
116 # define DOS_BASED_FILE_SYSTEM 1
118 # define DOS_BASED_FILE_SYSTEM 0
121 /* Return the full pathname of a binary file (the main executable or a
122 shared library file), or NULL if not found. If FD is non-NULL, *FD
123 is set to either -1 or an open file handle for the binary file.
125 Global variable GDB_SYSROOT is used as a prefix directory
126 to search for binary files if they have an absolute path.
127 If GDB_SYSROOT starts with "target:" and target filesystem
128 is the local filesystem then the "target:" prefix will be
129 stripped before the search starts. This ensures that the
130 same search algorithm is used for local files regardless of
131 whether a "target:" prefix was used.
133 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
134 (or set of directories, as in LD_LIBRARY_PATH) to search for all
135 shared libraries if not found in either the sysroot (if set) or
136 the local filesystem. SOLIB_SEARCH_PATH is not used when searching
137 for the main executable.
140 * If a sysroot is set and path is absolute:
141 * Search for sysroot/path.
143 * Look for it literally (unmodified).
144 * If IS_SOLIB is non-zero:
145 * Look in SOLIB_SEARCH_PATH.
146 * If available, use target defined search function.
147 * If NO sysroot is set, perform the following two searches:
148 * Look in inferior's $PATH.
149 * If IS_SOLIB is non-zero:
150 * Look in inferior's $LD_LIBRARY_PATH.
152 * The last check avoids doing this search when targeting remote
153 * machines since a sysroot will almost always be set.
156 static gdb::unique_xmalloc_ptr
<char>
157 solib_find_1 (const char *in_pathname
, int *fd
, bool is_solib
)
159 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
161 gdb::unique_xmalloc_ptr
<char> temp_pathname
;
162 const char *fskind
= effective_target_file_system_kind ();
163 const char *sysroot
= gdb_sysroot
.c_str ();
164 int prefix_len
, orig_prefix_len
;
166 /* If the absolute prefix starts with "target:" but the filesystem
167 accessed by the target_fileio_* methods is the local filesystem
168 then we strip the "target:" prefix now and work with the local
169 filesystem. This ensures that the same search algorithm is used
170 for all local files regardless of whether a "target:" prefix was
172 if (is_target_filename (sysroot
) && target_filesystem_is_local ())
173 sysroot
+= strlen (TARGET_SYSROOT_PREFIX
);
175 /* Strip any trailing slashes from the absolute prefix. */
176 prefix_len
= orig_prefix_len
= strlen (sysroot
);
178 while (prefix_len
> 0 && IS_DIR_SEPARATOR (sysroot
[prefix_len
- 1]))
181 std::string sysroot_holder
;
184 else if (prefix_len
!= orig_prefix_len
)
186 sysroot_holder
= std::string (sysroot
, prefix_len
);
187 sysroot
= sysroot_holder
.c_str ();
190 /* If we're on a non-DOS-based system, backslashes won't be
191 understood as directory separator, so, convert them to forward
192 slashes, iff we're supposed to handle DOS-based file system
193 semantics for target paths. */
194 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
198 /* Avoid clobbering our input. */
199 p
= (char *) alloca (strlen (in_pathname
) + 1);
200 strcpy (p
, in_pathname
);
210 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
211 IS_ABSOLUTE_PATH. The latter is for host paths only, while
212 IN_PATHNAME is a target path. For example, if we're supposed to
213 be handling DOS-like semantics we want to consider a
214 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
215 With such a path, before giving up on the sysroot, we'll try:
217 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
218 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
219 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
222 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || sysroot
== NULL
)
223 temp_pathname
.reset (xstrdup (in_pathname
));
226 bool need_dir_separator
;
228 /* Concatenate the sysroot and the target reported filename. We
229 may need to glue them with a directory separator. Cases to
232 | sysroot | separator | in_pathname |
233 |-----------------+-----------+----------------|
234 | /some/dir | / | c:/foo/bar.dll |
235 | /some/dir | | /foo/bar.dll |
236 | target: | | c:/foo/bar.dll |
237 | target: | | /foo/bar.dll |
238 | target:some/dir | / | c:/foo/bar.dll |
239 | target:some/dir | | /foo/bar.dll |
241 IOW, we don't need to add a separator if IN_PATHNAME already
242 has one, or when the sysroot is exactly "target:".
243 There's no need to check for drive spec explicitly, as we only
244 get here if IN_PATHNAME is considered an absolute path. */
245 need_dir_separator
= !(IS_DIR_SEPARATOR (in_pathname
[0])
246 || strcmp (TARGET_SYSROOT_PREFIX
, sysroot
) == 0);
248 /* Cat the prefixed pathname together. */
249 temp_pathname
.reset (concat (sysroot
,
250 need_dir_separator
? SLASH_STRING
: "",
251 in_pathname
, (char *) NULL
));
254 /* Handle files to be accessed via the target. */
255 if (is_target_filename (temp_pathname
.get ()))
259 return temp_pathname
;
262 /* Now see if we can open it. */
263 found_file
= gdb_open_cloexec (temp_pathname
.get (),
264 O_RDONLY
| O_BINARY
, 0).release ();
266 /* If the search in gdb_sysroot failed, and the path name has a
267 drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
268 and retrying in the sysroot:
269 c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
273 && HAS_TARGET_DRIVE_SPEC (fskind
, in_pathname
))
275 bool need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
276 char drive
[2] = { in_pathname
[0], '\0' };
278 temp_pathname
.reset (concat (sysroot
,
281 need_dir_separator
? SLASH_STRING
: "",
282 in_pathname
+ 2, (char *) NULL
));
284 found_file
= gdb_open_cloexec (temp_pathname
.get (),
285 O_RDONLY
| O_BINARY
, 0).release ();
288 /* If the search in gdb_sysroot still failed, try fully
289 stripping the drive spec, and trying once more in the
290 sysroot before giving up.
292 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
294 temp_pathname
.reset (concat (sysroot
,
295 need_dir_separator
? SLASH_STRING
: "",
296 in_pathname
+ 2, (char *) NULL
));
298 found_file
= gdb_open_cloexec (temp_pathname
.get (),
299 O_RDONLY
| O_BINARY
, 0).release ();
303 /* We try to find the library in various ways. After each attempt,
304 either found_file >= 0 and temp_pathname is a malloc'd string, or
305 found_file < 0 and temp_pathname does not point to storage that
306 needs to be freed. */
309 temp_pathname
.reset (NULL
);
311 /* If the search in gdb_sysroot failed, and the path name is
312 absolute at this point, make it relative. (openp will try and open the
313 file according to its absolute path otherwise, which is not what we want.)
314 Affects subsequent searches for this solib. */
315 if (found_file
< 0 && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
317 /* First, get rid of any drive letters etc. */
318 while (!IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
321 /* Next, get rid of all leading dir separators. */
322 while (IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
326 /* If not found, and we're looking for a solib, search the
327 solib_search_path (if any). */
328 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
329 found_file
= openp (solib_search_path
.c_str (),
330 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
331 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
333 /* If not found, and we're looking for a solib, next search the
334 solib_search_path (if any) for the basename only (ignoring the
335 path). This is to allow reading solibs from a path that differs
336 from the opened path. */
337 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
338 found_file
= openp (solib_search_path
.c_str (),
339 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
340 target_lbasename (fskind
, in_pathname
),
341 O_RDONLY
| O_BINARY
, &temp_pathname
);
343 /* If not found, and we're looking for a solib, try to use target
344 supplied solib search method. */
345 if (is_solib
&& found_file
< 0 && ops
->find_and_open_solib
)
346 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
349 /* If not found, next search the inferior's $PATH environment variable. */
350 if (found_file
< 0 && sysroot
== NULL
)
351 found_file
= openp (current_inferior ()->environment
.get ("PATH"),
352 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
353 O_RDONLY
| O_BINARY
, &temp_pathname
);
355 /* If not found, and we're looking for a solib, next search the
356 inferior's $LD_LIBRARY_PATH environment variable. */
357 if (is_solib
&& found_file
< 0 && sysroot
== NULL
)
358 found_file
= openp (current_inferior ()->environment
.get
360 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
361 O_RDONLY
| O_BINARY
, &temp_pathname
);
371 return temp_pathname
;
374 /* Return the full pathname of the main executable, or NULL if not
375 found. If FD is non-NULL, *FD is set to either -1 or an open file
376 handle for the main executable. */
378 gdb::unique_xmalloc_ptr
<char>
379 exec_file_find (const char *in_pathname
, int *fd
)
381 gdb::unique_xmalloc_ptr
<char> result
;
382 const char *fskind
= effective_target_file_system_kind ();
384 if (in_pathname
== NULL
)
387 if (!gdb_sysroot
.empty () && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
389 result
= solib_find_1 (in_pathname
, fd
, false);
391 if (result
== NULL
&& fskind
== file_system_kind_dos_based
)
395 new_pathname
= (char *) alloca (strlen (in_pathname
) + 5);
396 strcpy (new_pathname
, in_pathname
);
397 strcat (new_pathname
, ".exe");
399 result
= solib_find_1 (new_pathname
, fd
, false);
404 /* It's possible we don't have a full path, but rather just a
405 filename. Some targets, such as HP-UX, don't provide the
408 Attempt to qualify the filename against the source path.
409 (If that fails, we'll just fall back on the original
410 filename. Not much more we can do...) */
412 if (!source_full_path_of (in_pathname
, &result
))
413 result
.reset (xstrdup (in_pathname
));
421 /* Return the full pathname of a shared library file, or NULL if not
422 found. If FD is non-NULL, *FD is set to either -1 or an open file
423 handle for the shared library.
425 The search algorithm used is described in solib_find_1's comment
428 gdb::unique_xmalloc_ptr
<char>
429 solib_find (const char *in_pathname
, int *fd
)
431 const char *solib_symbols_extension
432 = gdbarch_solib_symbols_extension (target_gdbarch ());
434 /* If solib_symbols_extension is set, replace the file's
436 if (solib_symbols_extension
!= NULL
)
438 const char *p
= in_pathname
+ strlen (in_pathname
);
440 while (p
> in_pathname
&& *p
!= '.')
448 = (char *) alloca (p
- in_pathname
+ 1
449 + strlen (solib_symbols_extension
) + 1);
450 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
451 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
452 solib_symbols_extension
);
454 in_pathname
= new_pathname
;
458 return solib_find_1 (in_pathname
, fd
, true);
461 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
462 it is used as file handle to open the file. Throws an error if the file
463 could not be opened. Handles both local and remote file access.
465 If unsuccessful, the FD will be closed (unless FD was -1). */
468 solib_bfd_fopen (const char *pathname
, int fd
)
470 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (pathname
, gnutarget
, fd
));
472 if (abfd
!= NULL
&& !gdb_bfd_has_target_filename (abfd
.get ()))
473 bfd_set_cacheable (abfd
.get (), 1);
477 /* Arrange to free PATHNAME when the error is thrown. */
478 error (_("Could not open `%s' as an executable file: %s"),
479 pathname
, bfd_errmsg (bfd_get_error ()));
485 /* Find shared library PATHNAME and open a BFD for it. */
488 solib_bfd_open (const char *pathname
)
491 const struct bfd_arch_info
*b
;
493 /* Search for shared library file. */
494 gdb::unique_xmalloc_ptr
<char> found_pathname
495 = solib_find (pathname
, &found_file
);
496 if (found_pathname
== NULL
)
498 /* Return failure if the file could not be found, so that we can
499 accumulate messages about missing libraries. */
503 perror_with_name (pathname
);
506 /* Open bfd for shared library. */
507 gdb_bfd_ref_ptr
abfd (solib_bfd_fopen (found_pathname
.get (), found_file
));
509 /* Check bfd format. */
510 if (!bfd_check_format (abfd
.get (), bfd_object
))
511 error (_("`%s': not in executable format: %s"),
512 bfd_get_filename (abfd
.get ()), bfd_errmsg (bfd_get_error ()));
514 /* Check bfd arch. */
515 b
= gdbarch_bfd_arch_info (target_gdbarch ());
516 if (!b
->compatible (b
, bfd_get_arch_info (abfd
.get ())))
517 error (_("`%s': Shared library architecture %s is not compatible "
518 "with target architecture %s."), bfd_get_filename (abfd
.get ()),
519 bfd_get_arch_info (abfd
.get ())->printable_name
,
525 /* Mapping of a core file's shared library sonames to their respective
526 build-ids. Added to the registries of core file bfds. */
528 typedef std::unordered_map
<std::string
, std::string
> soname_build_id_map
;
530 /* Key used to associate a soname_build_id_map to a core file bfd. */
532 static const struct bfd_key
<soname_build_id_map
> cbfd_soname_build_id_data_key
;
537 set_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
,
539 const bfd_build_id
*build_id
)
541 gdb_assert (abfd
.get () != nullptr);
542 gdb_assert (soname
!= nullptr);
543 gdb_assert (build_id
!= nullptr);
545 soname_build_id_map
*mapptr
= cbfd_soname_build_id_data_key
.get (abfd
.get ());
547 if (mapptr
== nullptr)
548 mapptr
= cbfd_soname_build_id_data_key
.emplace (abfd
.get ());
550 (*mapptr
)[soname
] = build_id_to_string (build_id
);
555 gdb::unique_xmalloc_ptr
<char>
556 get_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
, const char *soname
)
558 if (abfd
.get () == nullptr || soname
== nullptr)
561 soname_build_id_map
*mapptr
562 = cbfd_soname_build_id_data_key
.get (abfd
.get ());
564 if (mapptr
== nullptr)
567 auto it
= mapptr
->find (lbasename (soname
));
568 if (it
== mapptr
->end ())
571 return make_unique_xstrdup (it
->second
.c_str ());
574 /* Given a pointer to one of the shared objects in our list of mapped
575 objects, use the recorded name to open a bfd descriptor for the
576 object, build a section table, relocate all the section addresses
577 by the base address at which the shared object was mapped, and then
578 add the sections to the target's section table.
580 FIXME: In most (all?) cases the shared object file name recorded in
581 the dynamic linkage tables will be a fully qualified pathname. For
582 cases where it isn't, do we really mimic the systems search
583 mechanism correctly in the below code (particularly the tilde
584 expansion stuff?). */
587 solib_map_sections (struct so_list
*so
)
589 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
591 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (so
->so_name
));
592 gdb_bfd_ref_ptr
abfd (ops
->bfd_open (filename
.get ()));
593 gdb::unique_xmalloc_ptr
<char> build_id_hexstr
594 = get_cbfd_soname_build_id (current_program_space
->cbfd
, so
->so_name
);
596 /* If we already know the build-id of this solib from a core file, verify
597 it matches ABFD's build-id. If there is a mismatch or the solib wasn't
598 found, attempt to query debuginfod for the correct solib. */
599 if (build_id_hexstr
.get () != nullptr)
601 bool mismatch
= false;
603 if (abfd
!= nullptr && abfd
->build_id
!= nullptr)
605 std::string build_id
= build_id_to_string (abfd
->build_id
);
607 if (build_id
!= build_id_hexstr
.get ())
610 if (abfd
== nullptr || mismatch
)
612 scoped_fd fd
= debuginfod_exec_query ((const unsigned char*)
613 build_id_hexstr
.get (),
614 0, so
->so_name
, &filename
);
617 abfd
= ops
->bfd_open (filename
.get ());
619 warning (_("Build-id of %ps does not match core file."),
620 styled_string (file_name_style
.style (), filename
.get ()));
627 /* Leave bfd open, core_xfer_memory and "info files" need it. */
628 so
->abfd
= abfd
.release ();
630 /* Copy the full path name into so_name, allowing symbol_file_add
631 to find it later. This also affects the =library-loaded GDB/MI
632 event, and in particular the part of that notification providing
633 the library's host-side path. If we let the target dictate
634 that objfile's path, and the target is different from the host,
635 GDB/MI will not provide the correct host-side path. */
636 if (strlen (bfd_get_filename (so
->abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
637 error (_("Shared library file name is too long."));
638 strcpy (so
->so_name
, bfd_get_filename (so
->abfd
));
640 if (so
->sections
== nullptr)
641 so
->sections
= new target_section_table
;
642 *so
->sections
= build_section_table (so
->abfd
);
644 for (target_section
&p
: *so
->sections
)
646 /* Relocate the section binding addresses as recorded in the shared
647 object's file by the base address to which the object was actually
649 ops
->relocate_section_addresses (so
, &p
);
651 /* If the target didn't provide information about the address
652 range of the shared object, assume we want the location of
653 the .text section. */
654 if (so
->addr_low
== 0 && so
->addr_high
== 0
655 && strcmp (p
.the_bfd_section
->name
, ".text") == 0)
657 so
->addr_low
= p
.addr
;
658 so
->addr_high
= p
.endaddr
;
662 /* Add the shared object's sections to the current set of file
663 section tables. Do this immediately after mapping the object so
664 that later nodes in the list can query this object, as is needed
666 current_program_space
->add_target_sections (so
, *so
->sections
);
671 /* Free symbol-file related contents of SO and reset for possible reloading
672 of SO. If we have opened a BFD for SO, close it. If we have placed SO's
673 sections in some target's section table, the caller is responsible for
676 This function doesn't mess with objfiles at all. If there is an
677 objfile associated with SO that needs to be removed, the caller is
678 responsible for taking care of that. */
681 clear_so (struct so_list
*so
)
683 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
688 gdb_bfd_unref (so
->abfd
);
691 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
692 so
->symbols_loaded
= 0;
695 so
->addr_low
= so
->addr_high
= 0;
697 /* Restore the target-supplied file name. SO_NAME may be the path
698 of the symbol file. */
699 strcpy (so
->so_name
, so
->so_original_name
);
701 /* Do the same for target-specific data. */
702 if (ops
->clear_so
!= NULL
)
706 /* Free the storage associated with the `struct so_list' object SO.
707 If we have opened a BFD for SO, close it.
709 The caller is responsible for removing SO from whatever list it is
710 a member of. If we have placed SO's sections in some target's
711 section table, the caller is responsible for removing them.
713 This function doesn't mess with objfiles at all. If there is an
714 objfile associated with SO that needs to be removed, the caller is
715 responsible for taking care of that. */
718 free_so (struct so_list
*so
)
720 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
729 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
730 be chatty about it. Return true if any symbols were actually loaded. */
733 solib_read_symbols (struct so_list
*so
, symfile_add_flags flags
)
735 if (so
->symbols_loaded
)
737 /* If needed, we've already warned in our caller. */
739 else if (so
->abfd
== NULL
)
741 /* We've already warned about this library, when trying to open
747 flags
|= current_inferior ()->symfile_flags
;
751 /* Have we already loaded this shared object? */
752 so
->objfile
= nullptr;
753 for (objfile
*objfile
: current_program_space
->objfiles ())
755 if (filename_cmp (objfile_name (objfile
), so
->so_name
) == 0
756 && objfile
->addr_low
== so
->addr_low
)
758 so
->objfile
= objfile
;
762 if (so
->objfile
== NULL
)
764 section_addr_info sap
765 = build_section_addr_info_from_section_table (*so
->sections
);
766 so
->objfile
= symbol_file_add_from_bfd (so
->abfd
, so
->so_name
,
769 so
->objfile
->addr_low
= so
->addr_low
;
772 so
->symbols_loaded
= 1;
774 catch (const gdb_exception_error
&e
)
776 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
777 " library symbols for %s:\n"),
787 /* Return true if KNOWN->objfile is used by any other so_list object
788 in the list of shared libraries. Return false otherwise. */
791 solib_used (const struct so_list
*const known
)
793 for (const struct so_list
*pivot
: current_program_space
->solibs ())
794 if (pivot
!= known
&& pivot
->objfile
== known
->objfile
)
802 update_solib_list (int from_tty
)
804 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
805 struct so_list
*inferior
= ops
->current_sos();
806 struct so_list
*gdb
, **gdb_link
;
808 /* We can reach here due to changing solib-search-path or the
809 sysroot, before having any inferior. */
810 if (target_has_execution () && inferior_ptid
!= null_ptid
)
812 struct inferior
*inf
= current_inferior ();
814 /* If we are attaching to a running process for which we
815 have not opened a symbol file, we may be able to get its
818 && current_program_space
->symfile_object_file
== NULL
)
822 ops
->open_symbol_file_object (from_tty
);
824 catch (const gdb_exception
&ex
)
826 exception_fprintf (gdb_stderr
, ex
,
827 "Error reading attached "
828 "process's symbol file.\n");
833 /* GDB and the inferior's dynamic linker each maintain their own
834 list of currently loaded shared objects; we want to bring the
835 former in sync with the latter. Scan both lists, seeing which
836 shared objects appear where. There are three cases:
838 - A shared object appears on both lists. This means that GDB
839 knows about it already, and it's still loaded in the inferior.
840 Nothing needs to happen.
842 - A shared object appears only on GDB's list. This means that
843 the inferior has unloaded it. We should remove the shared
844 object from GDB's tables.
846 - A shared object appears only on the inferior's list. This
847 means that it's just been loaded. We should add it to GDB's
850 So we walk GDB's list, checking each entry to see if it appears
851 in the inferior's list too. If it does, no action is needed, and
852 we remove it from the inferior's list. If it doesn't, the
853 inferior has unloaded it, and we remove it from GDB's list. By
854 the time we're done walking GDB's list, the inferior's list
855 contains only the new shared objects, which we then add. */
857 gdb
= current_program_space
->so_list
;
858 gdb_link
= ¤t_program_space
->so_list
;
861 struct so_list
*i
= inferior
;
862 struct so_list
**i_link
= &inferior
;
864 /* Check to see whether the shared object *gdb also appears in
865 the inferior's current list. */
870 if (ops
->same (gdb
, i
))
875 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
883 /* If the shared object appears on the inferior's list too, then
884 it's still loaded, so we don't need to do anything. Delete
885 it from the inferior's list, and leave it on GDB's list. */
890 gdb_link
= &gdb
->next
;
894 /* If it's not on the inferior's list, remove it from GDB's tables. */
897 /* Notify any observer that the shared object has been
898 unloaded before we remove it from GDB's tables. */
899 gdb::observers::solib_unloaded
.notify (gdb
);
901 current_program_space
->deleted_solibs
.push_back (gdb
->so_name
);
903 *gdb_link
= gdb
->next
;
905 /* Unless the user loaded it explicitly, free SO's objfile. */
906 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
)
907 && !solib_used (gdb
))
908 gdb
->objfile
->unlink ();
910 /* Some targets' section tables might be referring to
911 sections from so->abfd; remove them. */
912 current_program_space
->remove_target_sections (gdb
);
919 /* Now the inferior's list contains only shared objects that don't
920 appear in GDB's list --- those that are newly loaded. Add them
921 to GDB's shared object list. */
925 const char *not_found_filename
= NULL
;
929 /* Add the new shared objects to GDB's list. */
930 *gdb_link
= inferior
;
932 /* Fill in the rest of each of the `struct so_list' nodes. */
933 for (i
= inferior
; i
; i
= i
->next
)
936 i
->pspace
= current_program_space
;
937 current_program_space
->added_solibs
.push_back (i
);
941 /* Fill in the rest of the `struct so_list' node. */
942 if (!solib_map_sections (i
))
945 if (not_found_filename
== NULL
)
946 not_found_filename
= i
->so_original_name
;
950 catch (const gdb_exception_error
&e
)
952 exception_fprintf (gdb_stderr
, e
,
953 _("Error while mapping shared "
954 "library sections:\n"));
957 /* Notify any observer that the shared object has been
958 loaded now that we've added it to GDB's tables. */
959 gdb::observers::solib_loaded
.notify (i
);
962 /* If a library was not found, issue an appropriate warning
963 message. We have to use a single call to warning in case the
964 front end does something special with warnings, e.g., pop up
965 a dialog box. It Would Be Nice if we could get a "warning: "
966 prefix on each line in the CLI front end, though - it doesn't
970 warning (_("Could not load shared library symbols for %s.\n"
971 "Do you need \"set solib-search-path\" "
972 "or \"set sysroot\"?"),
974 else if (not_found
> 1)
976 Could not load shared library symbols for %d libraries, e.g. %s.\n\
977 Use the \"info sharedlibrary\" command to see the complete listing.\n\
978 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
979 not_found
, not_found_filename
);
984 /* Return non-zero if NAME is the libpthread shared library.
986 Uses a fairly simplistic heuristic approach where we check
987 the file name against "/libpthread". This can lead to false
988 positives, but this should be good enough in practice.
990 As of glibc-2.34, functions formerly residing in libpthread have
991 been moved to libc, so "/libc." needs to be checked too. (Matching
992 the "." will avoid matching libraries such as libcrypt.) */
995 libpthread_name_p (const char *name
)
997 return (strstr (name
, "/libpthread") != NULL
998 || strstr (name
, "/libc.") != NULL
);
1001 /* Return non-zero if SO is the libpthread shared library. */
1004 libpthread_solib_p (struct so_list
*so
)
1006 return libpthread_name_p (so
->so_name
);
1009 /* Read in symbolic information for any shared objects whose names
1010 match PATTERN. (If we've already read a shared object's symbol
1011 info, leave it alone.) If PATTERN is zero, read them all.
1013 If READSYMS is 0, defer reading symbolic information until later
1014 but still do any needed low level processing.
1016 FROM_TTY is described for update_solib_list, above. */
1019 solib_add (const char *pattern
, int from_tty
, int readsyms
)
1021 if (print_symbol_loading_p (from_tty
, 0, 0))
1023 if (pattern
!= NULL
)
1025 gdb_printf (_("Loading symbols for shared libraries: %s\n"),
1029 gdb_printf (_("Loading symbols for shared libraries.\n"));
1032 current_program_space
->solib_add_generation
++;
1036 char *re_err
= re_comp (pattern
);
1039 error (_("Invalid regexp: %s"), re_err
);
1042 update_solib_list (from_tty
);
1044 /* Walk the list of currently loaded shared libraries, and read
1045 symbols for any that match the pattern --- or any whose symbols
1046 aren't already loaded, if no pattern was given. */
1048 bool any_matches
= false;
1049 bool loaded_any_symbols
= false;
1050 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1053 add_flags
|= SYMFILE_VERBOSE
;
1055 for (struct so_list
*gdb
: current_program_space
->solibs ())
1056 if (! pattern
|| re_exec (gdb
->so_name
))
1058 /* Normally, we would read the symbols from that library
1059 only if READSYMS is set. However, we're making a small
1060 exception for the pthread library, because we sometimes
1061 need the library symbols to be loaded in order to provide
1062 thread support (x86-linux for instance). */
1063 const int add_this_solib
=
1064 (readsyms
|| libpthread_solib_p (gdb
));
1069 if (gdb
->symbols_loaded
)
1071 /* If no pattern was given, be quiet for shared
1072 libraries we have already loaded. */
1073 if (pattern
&& (from_tty
|| info_verbose
))
1074 gdb_printf (_("Symbols already loaded for %s\n"),
1077 else if (solib_read_symbols (gdb
, add_flags
))
1078 loaded_any_symbols
= true;
1082 if (loaded_any_symbols
)
1083 breakpoint_re_set ();
1085 if (from_tty
&& pattern
&& ! any_matches
)
1087 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
1089 if (loaded_any_symbols
)
1091 /* Getting new symbols may change our opinion about what is
1093 reinit_frame_cache ();
1098 /* Implement the "info sharedlibrary" command. Walk through the
1099 shared library list and print information about each attached
1100 library matching PATTERN. If PATTERN is elided, print them
1104 info_sharedlibrary_command (const char *pattern
, int from_tty
)
1106 bool so_missing_debug_info
= false;
1109 struct gdbarch
*gdbarch
= target_gdbarch ();
1110 struct ui_out
*uiout
= current_uiout
;
1114 char *re_err
= re_comp (pattern
);
1117 error (_("Invalid regexp: %s"), re_err
);
1120 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1121 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1123 update_solib_list (from_tty
);
1125 /* ui_out_emit_table table_emitter needs to know the number of rows,
1126 so we need to make two passes over the libs. */
1129 for (struct so_list
*so
: current_program_space
->solibs ())
1133 if (pattern
&& ! re_exec (so
->so_name
))
1140 ui_out_emit_table
table_emitter (uiout
, 4, nr_libs
, "SharedLibraryTable");
1142 /* The "- 1" is because ui_out adds one space between columns. */
1143 uiout
->table_header (addr_width
- 1, ui_left
, "from", "From");
1144 uiout
->table_header (addr_width
- 1, ui_left
, "to", "To");
1145 uiout
->table_header (12 - 1, ui_left
, "syms-read", "Syms Read");
1146 uiout
->table_header (0, ui_noalign
, "name", "Shared Object Library");
1148 uiout
->table_body ();
1150 for (struct so_list
*so
: current_program_space
->solibs ())
1152 if (! so
->so_name
[0])
1154 if (pattern
&& ! re_exec (so
->so_name
))
1157 ui_out_emit_tuple
tuple_emitter (uiout
, "lib");
1159 if (so
->addr_high
!= 0)
1161 uiout
->field_core_addr ("from", gdbarch
, so
->addr_low
);
1162 uiout
->field_core_addr ("to", gdbarch
, so
->addr_high
);
1166 uiout
->field_skip ("from");
1167 uiout
->field_skip ("to");
1170 if (! top_level_interpreter ()->interp_ui_out ()->is_mi_like_p ()
1171 && so
->symbols_loaded
1172 && !objfile_has_symbols (so
->objfile
))
1174 so_missing_debug_info
= true;
1175 uiout
->field_string ("syms-read", "Yes (*)");
1178 uiout
->field_string ("syms-read", so
->symbols_loaded
? "Yes" : "No");
1180 uiout
->field_string ("name", so
->so_name
, file_name_style
.style ());
1189 uiout
->message (_("No shared libraries matched.\n"));
1191 uiout
->message (_("No shared libraries loaded at this time.\n"));
1195 if (so_missing_debug_info
)
1196 uiout
->message (_("(*): Shared library is missing "
1197 "debugging information.\n"));
1204 solib_contains_address_p (const struct so_list
*const solib
,
1207 if (solib
->sections
== nullptr)
1210 for (target_section
&p
: *solib
->sections
)
1211 if (p
.addr
<= address
&& address
< p
.endaddr
)
1217 /* If ADDRESS is in a shared lib in program space PSPACE, return its
1220 Provides a hook for other gdb routines to discover whether or not a
1221 particular address is within the mapped address space of a shared
1224 For example, this routine is called at one point to disable
1225 breakpoints which are in shared libraries that are not currently
1229 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1231 struct so_list
*so
= NULL
;
1233 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1234 if (solib_contains_address_p (so
, address
))
1235 return (so
->so_name
);
1243 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1245 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1247 if (ops
->keep_data_in_core
)
1248 return ops
->keep_data_in_core (vaddr
, size
) != 0;
1253 /* Called by free_all_symtabs */
1258 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1260 disable_breakpoints_in_shlibs ();
1262 while (current_program_space
->so_list
)
1264 struct so_list
*so
= current_program_space
->so_list
;
1266 current_program_space
->so_list
= so
->next
;
1267 gdb::observers::solib_unloaded
.notify (so
);
1268 current_program_space
->remove_target_sections (so
);
1272 ops
->clear_solib ();
1275 /* Shared library startup support. When GDB starts up the inferior,
1276 it nurses it along (through the shell) until it is ready to execute
1277 its first instruction. At this point, this function gets
1281 solib_create_inferior_hook (int from_tty
)
1283 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1285 ops
->solib_create_inferior_hook (from_tty
);
1291 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1293 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1295 return ops
->in_dynsym_resolve_code (pc
) != 0;
1298 /* Implements the "sharedlibrary" command. */
1301 sharedlibrary_command (const char *args
, int from_tty
)
1304 solib_add (args
, from_tty
, 1);
1307 /* Implements the command "nosharedlibrary", which discards symbols
1308 that have been auto-loaded from shared libraries. Symbols from
1309 shared libraries that were added by explicit request of the user
1310 are not discarded. Also called from remote.c. */
1313 no_shared_libraries (const char *ignored
, int from_tty
)
1315 /* The order of the two routines below is important: clear_solib notifies
1316 the solib_unloaded observers, and some of these observers might need
1317 access to their associated objfiles. Therefore, we can not purge the
1318 solibs' objfiles before clear_solib has been called. */
1321 objfile_purge_solibs ();
1327 update_solib_breakpoints (void)
1329 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1331 if (ops
->update_breakpoints
!= NULL
)
1332 ops
->update_breakpoints ();
1338 handle_solib_event (void)
1340 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1342 if (ops
->handle_event
!= NULL
)
1343 ops
->handle_event ();
1345 current_inferior ()->pspace
->clear_solib_cache ();
1347 /* Check for any newly added shared libraries if we're supposed to
1348 be adding them automatically. Switch terminal for any messages
1349 produced by breakpoint_re_set. */
1350 target_terminal::ours_for_output ();
1351 solib_add (NULL
, 0, auto_solib_add
);
1352 target_terminal::inferior ();
1355 /* Reload shared libraries, but avoid reloading the same symbol file
1356 we already have loaded. */
1359 reload_shared_libraries_1 (int from_tty
)
1361 if (print_symbol_loading_p (from_tty
, 0, 0))
1362 gdb_printf (_("Loading symbols for shared libraries.\n"));
1364 for (struct so_list
*so
: current_program_space
->solibs ())
1366 const char *found_pathname
= NULL
;
1367 bool was_loaded
= so
->symbols_loaded
!= 0;
1368 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1371 add_flags
|= SYMFILE_VERBOSE
;
1373 gdb::unique_xmalloc_ptr
<char> filename
1374 (tilde_expand (so
->so_original_name
));
1375 gdb_bfd_ref_ptr
abfd (solib_bfd_open (filename
.get ()));
1377 found_pathname
= bfd_get_filename (abfd
.get ());
1379 /* If this shared library is no longer associated with its previous
1380 symbol file, close that. */
1381 if ((found_pathname
== NULL
&& was_loaded
)
1382 || (found_pathname
!= NULL
1383 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1385 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
)
1386 && !solib_used (so
))
1387 so
->objfile
->unlink ();
1388 current_program_space
->remove_target_sections (so
);
1392 /* If this shared library is now associated with a new symbol
1394 if (found_pathname
!= NULL
1396 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1398 bool got_error
= false;
1402 solib_map_sections (so
);
1405 catch (const gdb_exception_error
&e
)
1407 exception_fprintf (gdb_stderr
, e
,
1408 _("Error while mapping "
1409 "shared library sections:\n"));
1414 && (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
)))
1415 solib_read_symbols (so
, add_flags
);
1421 reload_shared_libraries (const char *ignored
, int from_tty
,
1422 struct cmd_list_element
*e
)
1424 const struct target_so_ops
*ops
;
1426 reload_shared_libraries_1 (from_tty
);
1428 ops
= solib_ops (target_gdbarch ());
1430 /* Creating inferior hooks here has two purposes. First, if we reload
1431 shared libraries then the address of solib breakpoint we've computed
1432 previously might be no longer valid. For example, if we forgot to set
1433 solib-absolute-prefix and are setting it right now, then the previous
1434 breakpoint address is plain wrong. Second, installing solib hooks
1435 also implicitly figures were ld.so is and loads symbols for it.
1436 Absent this call, if we've just connected to a target and set
1437 solib-absolute-prefix or solib-search-path, we'll lose all information
1439 if (target_has_execution ())
1441 /* Reset or free private data structures not associated with
1443 ops
->clear_solib ();
1445 /* Remove any previous solib event breakpoint. This is usually
1446 done in common code, at breakpoint_init_inferior time, but
1447 we're not really starting up the inferior here. */
1448 remove_solib_event_breakpoints ();
1450 solib_create_inferior_hook (from_tty
);
1453 /* Sometimes the platform-specific hook loads initial shared
1454 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1455 incorrectly 0 but such solib targets should be fixed anyway. If we
1456 made all the inferior hook methods consistent, this call could be
1457 removed. Call it only after the solib target has been initialized by
1458 solib_create_inferior_hook. */
1460 solib_add (NULL
, 0, auto_solib_add
);
1462 breakpoint_re_set ();
1464 /* We may have loaded or unloaded debug info for some (or all)
1465 shared libraries. However, frames may still reference them. For
1466 example, a frame's unwinder might still point at DWARF FDE
1467 structures that are now freed. Also, getting new symbols may
1468 change our opinion about what is frameless. */
1469 reinit_frame_cache ();
1472 /* Wrapper for reload_shared_libraries that replaces "remote:"
1473 at the start of gdb_sysroot with "target:". */
1476 gdb_sysroot_changed (const char *ignored
, int from_tty
,
1477 struct cmd_list_element
*e
)
1479 const char *old_prefix
= "remote:";
1480 const char *new_prefix
= TARGET_SYSROOT_PREFIX
;
1482 if (startswith (gdb_sysroot
.c_str (), old_prefix
))
1484 static bool warning_issued
= false;
1486 gdb_assert (strlen (old_prefix
) == strlen (new_prefix
));
1487 gdb_sysroot
= new_prefix
+ gdb_sysroot
.substr (strlen (old_prefix
));
1489 if (!warning_issued
)
1491 warning (_("\"%s\" is deprecated, use \"%s\" instead."),
1492 old_prefix
, new_prefix
);
1493 warning (_("sysroot set to \"%s\"."), gdb_sysroot
.c_str ());
1495 warning_issued
= true;
1499 reload_shared_libraries (ignored
, from_tty
, e
);
1503 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1504 struct cmd_list_element
*c
, const char *value
)
1506 gdb_printf (file
, _("Autoloading of shared library symbols is %s.\n"),
1511 /* Lookup the value for a specific symbol from dynamic symbol table. Look
1512 up symbol from ABFD. MATCH_SYM is a callback function to determine
1513 whether to pick up a symbol. DATA is the input of this callback
1514 function. Return NULL if symbol is not found. */
1517 gdb_bfd_lookup_symbol_from_symtab (bfd
*abfd
,
1518 int (*match_sym
) (const asymbol
*,
1522 long storage_needed
= bfd_get_symtab_upper_bound (abfd
);
1523 CORE_ADDR symaddr
= 0;
1525 if (storage_needed
> 0)
1529 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1530 asymbol
**symbol_table
= storage
.data ();
1531 unsigned int number_of_symbols
=
1532 bfd_canonicalize_symtab (abfd
, symbol_table
);
1534 for (i
= 0; i
< number_of_symbols
; i
++)
1536 asymbol
*sym
= *symbol_table
++;
1538 if (match_sym (sym
, data
))
1540 struct gdbarch
*gdbarch
= target_gdbarch ();
1541 symaddr
= sym
->value
;
1543 /* Some ELF targets fiddle with addresses of symbols they
1544 consider special. They use minimal symbols to do that
1545 and this is needed for correct breakpoint placement,
1546 but we do not have full data here to build a complete
1547 minimal symbol, so just set the address and let the
1548 targets cope with that. */
1549 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1550 && gdbarch_elf_make_msymbol_special_p (gdbarch
))
1552 struct minimal_symbol msym
{};
1554 msym
.set_value_address (symaddr
);
1555 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, &msym
);
1556 symaddr
= msym
.value_raw_address ();
1559 /* BFD symbols are section relative. */
1560 symaddr
+= sym
->section
->vma
;
1572 gdb_bfd_scan_elf_dyntag (const int desired_dyntag
, bfd
*abfd
, CORE_ADDR
*ptr
,
1573 CORE_ADDR
*ptr_addr
)
1575 int arch_size
, step
, sect_size
;
1576 long current_dyntag
;
1577 CORE_ADDR dyn_ptr
, dyn_addr
;
1578 gdb_byte
*bufend
, *bufstart
, *buf
;
1579 Elf32_External_Dyn
*x_dynp_32
;
1580 Elf64_External_Dyn
*x_dynp_64
;
1581 struct bfd_section
*sect
;
1586 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
1589 arch_size
= bfd_get_arch_size (abfd
);
1590 if (arch_size
== -1)
1593 /* Find the start address of the .dynamic section. */
1594 sect
= bfd_get_section_by_name (abfd
, ".dynamic");
1599 for (const target_section
&target_section
1600 : current_program_space
->target_sections ())
1601 if (sect
== target_section
.the_bfd_section
)
1603 dyn_addr
= target_section
.addr
;
1609 /* ABFD may come from OBJFILE acting only as a symbol file without being
1610 loaded into the target (see add_symbol_file_command). This case is
1611 such fallback to the file VMA address without the possibility of
1612 having the section relocated to its actual in-memory address. */
1614 dyn_addr
= bfd_section_vma (sect
);
1617 /* Read in .dynamic from the BFD. We will get the actual value
1618 from memory later. */
1619 sect_size
= bfd_section_size (sect
);
1620 buf
= bufstart
= (gdb_byte
*) alloca (sect_size
);
1621 if (!bfd_get_section_contents (abfd
, sect
,
1625 /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
1626 step
= (arch_size
== 32) ? sizeof (Elf32_External_Dyn
)
1627 : sizeof (Elf64_External_Dyn
);
1628 for (bufend
= buf
+ sect_size
;
1632 if (arch_size
== 32)
1634 x_dynp_32
= (Elf32_External_Dyn
*) buf
;
1635 current_dyntag
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_tag
);
1636 dyn_ptr
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_un
.d_ptr
);
1640 x_dynp_64
= (Elf64_External_Dyn
*) buf
;
1641 current_dyntag
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_tag
);
1642 dyn_ptr
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_un
.d_ptr
);
1644 if (current_dyntag
== DT_NULL
)
1646 if (current_dyntag
== desired_dyntag
)
1648 /* If requested, try to read the runtime value of this .dynamic
1652 struct type
*ptr_type
;
1653 gdb_byte ptr_buf
[8];
1654 CORE_ADDR ptr_addr_1
;
1656 ptr_type
= builtin_type (target_gdbarch ())->builtin_data_ptr
;
1657 ptr_addr_1
= dyn_addr
+ (buf
- bufstart
) + arch_size
/ 8;
1658 if (target_read_memory (ptr_addr_1
, ptr_buf
, arch_size
/ 8) == 0)
1659 dyn_ptr
= extract_typed_address (ptr_buf
, ptr_type
);
1662 *ptr_addr
= dyn_addr
+ (buf
- bufstart
);
1673 gdb::unique_xmalloc_ptr
<char>
1674 gdb_bfd_read_elf_soname (const char *filename
)
1676 gdb_bfd_ref_ptr abfd
= gdb_bfd_open (filename
, gnutarget
);
1678 if (abfd
== nullptr)
1681 /* Check that ABFD is an ET_DYN ELF file. */
1682 if (!bfd_check_format (abfd
.get (), bfd_object
)
1683 || !(bfd_get_file_flags (abfd
.get ()) & DYNAMIC
))
1687 if (!gdb_bfd_scan_elf_dyntag (DT_SONAME
, abfd
.get (), &idx
, nullptr))
1690 struct bfd_section
*dynstr
= bfd_get_section_by_name (abfd
.get (), ".dynstr");
1691 int sect_size
= bfd_section_size (dynstr
);
1692 if (dynstr
== nullptr || sect_size
<= idx
)
1695 /* Read soname from the string table. */
1696 gdb::byte_vector dynstr_buf
;
1697 if (!gdb_bfd_get_full_section_contents (abfd
.get (), dynstr
, &dynstr_buf
))
1700 /* Ensure soname is null-terminated before returning a copy. */
1701 char *soname
= (char *) dynstr_buf
.data () + idx
;
1702 if (strnlen (soname
, sect_size
- idx
) == sect_size
- idx
)
1705 return make_unique_xstrdup (soname
);
1708 /* Lookup the value for a specific symbol from symbol table. Look up symbol
1709 from ABFD. MATCH_SYM is a callback function to determine whether to pick
1710 up a symbol. DATA is the input of this callback function. Return NULL
1711 if symbol is not found. */
1714 bfd_lookup_symbol_from_dyn_symtab (bfd
*abfd
,
1715 int (*match_sym
) (const asymbol
*,
1719 long storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
1720 CORE_ADDR symaddr
= 0;
1722 if (storage_needed
> 0)
1725 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1726 asymbol
**symbol_table
= storage
.data ();
1727 unsigned int number_of_symbols
=
1728 bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
1730 for (i
= 0; i
< number_of_symbols
; i
++)
1732 asymbol
*sym
= *symbol_table
++;
1734 if (match_sym (sym
, data
))
1736 /* BFD symbols are section relative. */
1737 symaddr
= sym
->value
+ sym
->section
->vma
;
1745 /* Lookup the value for a specific symbol from symbol table and dynamic
1746 symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
1747 function to determine whether to pick up a symbol. DATA is the
1748 input of this callback function. Return NULL if symbol is not
1752 gdb_bfd_lookup_symbol (bfd
*abfd
,
1753 int (*match_sym
) (const asymbol
*, const void *),
1756 CORE_ADDR symaddr
= gdb_bfd_lookup_symbol_from_symtab (abfd
, match_sym
, data
);
1758 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
1759 have to check the dynamic string table too. */
1761 symaddr
= bfd_lookup_symbol_from_dyn_symtab (abfd
, match_sym
, data
);
1766 /* The shared library list may contain user-loaded object files that
1767 can be removed out-of-band by the user. So upon notification of
1768 free_objfile remove all references to any user-loaded file that is
1769 about to be freed. */
1772 remove_user_added_objfile (struct objfile
*objfile
)
1774 if (objfile
!= 0 && objfile
->flags
& OBJF_USERLOADED
)
1776 for (struct so_list
*so
: current_program_space
->solibs ())
1777 if (so
->objfile
== objfile
)
1782 void _initialize_solib ();
1784 _initialize_solib ()
1786 solib_data
= gdbarch_data_register_pre_init (solib_init
);
1788 gdb::observers::free_objfile
.attach (remove_user_added_objfile
,
1790 gdb::observers::inferior_execd
.attach ([] (inferior
*inf
)
1792 solib_create_inferior_hook (0);
1795 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1796 _("Load shared object library symbols for files matching REGEXP."));
1797 cmd_list_element
*info_sharedlibrary_cmd
1798 = add_info ("sharedlibrary", info_sharedlibrary_command
,
1799 _("Status of loaded shared object libraries."));
1800 add_info_alias ("dll", info_sharedlibrary_cmd
, 1);
1801 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1802 _("Unload all shared object library symbols."));
1804 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1805 &auto_solib_add
, _("\
1806 Set autoloading of shared library symbols."), _("\
1807 Show autoloading of shared library symbols."), _("\
1808 If \"on\", symbols from all shared object libraries will be loaded\n\
1809 automatically when the inferior begins execution, when the dynamic linker\n\
1810 informs gdb that a new library has been loaded, or when attaching to the\n\
1811 inferior. Otherwise, symbols must be loaded manually, using \
1814 show_auto_solib_add
,
1815 &setlist
, &showlist
);
1817 set_show_commands sysroot_cmds
1818 = add_setshow_optional_filename_cmd ("sysroot", class_support
,
1820 Set an alternate system root."), _("\
1821 Show the current system root."), _("\
1822 The system root is used to load absolute shared library symbol files.\n\
1823 For other (relative) files, you can add directories using\n\
1824 `set solib-search-path'."),
1825 gdb_sysroot_changed
,
1827 &setlist
, &showlist
);
1829 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.set
, class_support
, 0,
1831 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.show
, class_support
, 0,
1834 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1835 &solib_search_path
, _("\
1836 Set the search path for loading non-absolute shared library symbol files."),
1838 Show the search path for loading non-absolute shared library symbol files."),
1840 This takes precedence over the environment variables \
1841 PATH and LD_LIBRARY_PATH."),
1842 reload_shared_libraries
,
1843 show_solib_search_path
,
1844 &setlist
, &showlist
);