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 const registry
<gdbarch
>::key
<const struct target_so_ops
,
61 gdb::noop_deleter
<const struct target_so_ops
>>
64 static const struct target_so_ops
*
65 solib_ops (struct gdbarch
*gdbarch
)
67 const struct target_so_ops
*result
= solib_data
.get (gdbarch
);
68 if (result
== nullptr)
70 result
= current_target_so_ops
;
71 set_solib_ops (gdbarch
, current_target_so_ops
);
76 /* Set the solib operations for GDBARCH to NEW_OPS. */
79 set_solib_ops (struct gdbarch
*gdbarch
, const struct target_so_ops
*new_ops
)
81 solib_data
.set (gdbarch
, new_ops
);
85 /* external data declarations */
87 /* FIXME: gdbarch needs to control this variable, or else every
88 configuration needs to call set_solib_ops. */
89 struct target_so_ops
*current_target_so_ops
;
91 /* Local function prototypes */
93 /* If non-empty, this is a search path for loading non-absolute shared library
94 symbol files. This takes precedence over the environment variables PATH
95 and LD_LIBRARY_PATH. */
96 static std::string solib_search_path
;
98 show_solib_search_path (struct ui_file
*file
, int from_tty
,
99 struct cmd_list_element
*c
, const char *value
)
101 gdb_printf (file
, _("The search path for loading non-absolute "
102 "shared library symbol files is %s.\n"),
106 /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
107 #if (HAVE_DOS_BASED_FILE_SYSTEM)
108 # define DOS_BASED_FILE_SYSTEM 1
110 # define DOS_BASED_FILE_SYSTEM 0
113 /* Return the full pathname of a binary file (the main executable or a
114 shared library file), or NULL if not found. If FD is non-NULL, *FD
115 is set to either -1 or an open file handle for the binary file.
117 Global variable GDB_SYSROOT is used as a prefix directory
118 to search for binary files if they have an absolute path.
119 If GDB_SYSROOT starts with "target:" and target filesystem
120 is the local filesystem then the "target:" prefix will be
121 stripped before the search starts. This ensures that the
122 same search algorithm is used for local files regardless of
123 whether a "target:" prefix was used.
125 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
126 (or set of directories, as in LD_LIBRARY_PATH) to search for all
127 shared libraries if not found in either the sysroot (if set) or
128 the local filesystem. SOLIB_SEARCH_PATH is not used when searching
129 for the main executable.
132 * If a sysroot is set and path is absolute:
133 * Search for sysroot/path.
135 * Look for it literally (unmodified).
136 * If IS_SOLIB is non-zero:
137 * Look in SOLIB_SEARCH_PATH.
138 * If available, use target defined search function.
139 * If NO sysroot is set, perform the following two searches:
140 * Look in inferior's $PATH.
141 * If IS_SOLIB is non-zero:
142 * Look in inferior's $LD_LIBRARY_PATH.
144 * The last check avoids doing this search when targeting remote
145 * machines since a sysroot will almost always be set.
148 static gdb::unique_xmalloc_ptr
<char>
149 solib_find_1 (const char *in_pathname
, int *fd
, bool is_solib
)
151 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
153 gdb::unique_xmalloc_ptr
<char> temp_pathname
;
154 const char *fskind
= effective_target_file_system_kind ();
155 const char *sysroot
= gdb_sysroot
.c_str ();
156 int prefix_len
, orig_prefix_len
;
158 /* If the absolute prefix starts with "target:" but the filesystem
159 accessed by the target_fileio_* methods is the local filesystem
160 then we strip the "target:" prefix now and work with the local
161 filesystem. This ensures that the same search algorithm is used
162 for all local files regardless of whether a "target:" prefix was
164 if (is_target_filename (sysroot
) && target_filesystem_is_local ())
165 sysroot
+= strlen (TARGET_SYSROOT_PREFIX
);
167 /* Strip any trailing slashes from the absolute prefix. */
168 prefix_len
= orig_prefix_len
= strlen (sysroot
);
170 while (prefix_len
> 0 && IS_DIR_SEPARATOR (sysroot
[prefix_len
- 1]))
173 std::string sysroot_holder
;
176 else if (prefix_len
!= orig_prefix_len
)
178 sysroot_holder
= std::string (sysroot
, prefix_len
);
179 sysroot
= sysroot_holder
.c_str ();
182 /* If we're on a non-DOS-based system, backslashes won't be
183 understood as directory separator, so, convert them to forward
184 slashes, iff we're supposed to handle DOS-based file system
185 semantics for target paths. */
186 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
190 /* Avoid clobbering our input. */
191 p
= (char *) alloca (strlen (in_pathname
) + 1);
192 strcpy (p
, in_pathname
);
202 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
203 IS_ABSOLUTE_PATH. The latter is for host paths only, while
204 IN_PATHNAME is a target path. For example, if we're supposed to
205 be handling DOS-like semantics we want to consider a
206 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
207 With such a path, before giving up on the sysroot, we'll try:
209 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
210 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
211 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
214 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || sysroot
== NULL
)
215 temp_pathname
.reset (xstrdup (in_pathname
));
218 bool need_dir_separator
;
220 /* Concatenate the sysroot and the target reported filename. We
221 may need to glue them with a directory separator. Cases to
224 | sysroot | separator | in_pathname |
225 |-----------------+-----------+----------------|
226 | /some/dir | / | c:/foo/bar.dll |
227 | /some/dir | | /foo/bar.dll |
228 | target: | | c:/foo/bar.dll |
229 | target: | | /foo/bar.dll |
230 | target:some/dir | / | c:/foo/bar.dll |
231 | target:some/dir | | /foo/bar.dll |
233 IOW, we don't need to add a separator if IN_PATHNAME already
234 has one, or when the sysroot is exactly "target:".
235 There's no need to check for drive spec explicitly, as we only
236 get here if IN_PATHNAME is considered an absolute path. */
237 need_dir_separator
= !(IS_DIR_SEPARATOR (in_pathname
[0])
238 || strcmp (TARGET_SYSROOT_PREFIX
, sysroot
) == 0);
240 /* Cat the prefixed pathname together. */
241 temp_pathname
.reset (concat (sysroot
,
242 need_dir_separator
? SLASH_STRING
: "",
243 in_pathname
, (char *) NULL
));
246 /* Handle files to be accessed via the target. */
247 if (is_target_filename (temp_pathname
.get ()))
251 return temp_pathname
;
254 /* Now see if we can open it. */
255 found_file
= gdb_open_cloexec (temp_pathname
.get (),
256 O_RDONLY
| O_BINARY
, 0).release ();
258 /* If the search in gdb_sysroot failed, and the path name has a
259 drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
260 and retrying in the sysroot:
261 c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
265 && HAS_TARGET_DRIVE_SPEC (fskind
, in_pathname
))
267 bool need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
268 char drive
[2] = { in_pathname
[0], '\0' };
270 temp_pathname
.reset (concat (sysroot
,
273 need_dir_separator
? SLASH_STRING
: "",
274 in_pathname
+ 2, (char *) NULL
));
276 found_file
= gdb_open_cloexec (temp_pathname
.get (),
277 O_RDONLY
| O_BINARY
, 0).release ();
280 /* If the search in gdb_sysroot still failed, try fully
281 stripping the drive spec, and trying once more in the
282 sysroot before giving up.
284 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
286 temp_pathname
.reset (concat (sysroot
,
287 need_dir_separator
? SLASH_STRING
: "",
288 in_pathname
+ 2, (char *) NULL
));
290 found_file
= gdb_open_cloexec (temp_pathname
.get (),
291 O_RDONLY
| O_BINARY
, 0).release ();
295 /* We try to find the library in various ways. After each attempt,
296 either found_file >= 0 and temp_pathname is a malloc'd string, or
297 found_file < 0 and temp_pathname does not point to storage that
298 needs to be freed. */
301 temp_pathname
.reset (NULL
);
303 /* If the search in gdb_sysroot failed, and the path name is
304 absolute at this point, make it relative. (openp will try and open the
305 file according to its absolute path otherwise, which is not what we want.)
306 Affects subsequent searches for this solib. */
307 if (found_file
< 0 && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
309 /* First, get rid of any drive letters etc. */
310 while (!IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
313 /* Next, get rid of all leading dir separators. */
314 while (IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
318 /* If not found, and we're looking for a solib, search the
319 solib_search_path (if any). */
320 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
321 found_file
= openp (solib_search_path
.c_str (),
322 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
323 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
325 /* If not found, and we're looking for a solib, next search the
326 solib_search_path (if any) for the basename only (ignoring the
327 path). This is to allow reading solibs from a path that differs
328 from the opened path. */
329 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
330 found_file
= openp (solib_search_path
.c_str (),
331 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
332 target_lbasename (fskind
, in_pathname
),
333 O_RDONLY
| O_BINARY
, &temp_pathname
);
335 /* If not found, and we're looking for a solib, try to use target
336 supplied solib search method. */
337 if (is_solib
&& found_file
< 0 && ops
->find_and_open_solib
)
338 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
341 /* If not found, next search the inferior's $PATH environment variable. */
342 if (found_file
< 0 && sysroot
== NULL
)
343 found_file
= openp (current_inferior ()->environment
.get ("PATH"),
344 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
345 O_RDONLY
| O_BINARY
, &temp_pathname
);
347 /* If not found, and we're looking for a solib, next search the
348 inferior's $LD_LIBRARY_PATH environment variable. */
349 if (is_solib
&& found_file
< 0 && sysroot
== NULL
)
350 found_file
= openp (current_inferior ()->environment
.get
352 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
353 O_RDONLY
| O_BINARY
, &temp_pathname
);
363 return temp_pathname
;
366 /* Return the full pathname of the main executable, or NULL if not
367 found. If FD is non-NULL, *FD is set to either -1 or an open file
368 handle for the main executable. */
370 gdb::unique_xmalloc_ptr
<char>
371 exec_file_find (const char *in_pathname
, int *fd
)
373 gdb::unique_xmalloc_ptr
<char> result
;
374 const char *fskind
= effective_target_file_system_kind ();
376 if (in_pathname
== NULL
)
379 if (!gdb_sysroot
.empty () && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
381 result
= solib_find_1 (in_pathname
, fd
, false);
383 if (result
== NULL
&& fskind
== file_system_kind_dos_based
)
387 new_pathname
= (char *) alloca (strlen (in_pathname
) + 5);
388 strcpy (new_pathname
, in_pathname
);
389 strcat (new_pathname
, ".exe");
391 result
= solib_find_1 (new_pathname
, fd
, false);
396 /* It's possible we don't have a full path, but rather just a
397 filename. Some targets, such as HP-UX, don't provide the
400 Attempt to qualify the filename against the source path.
401 (If that fails, we'll just fall back on the original
402 filename. Not much more we can do...) */
404 if (!source_full_path_of (in_pathname
, &result
))
405 result
.reset (xstrdup (in_pathname
));
413 /* Return the full pathname of a shared library file, or NULL if not
414 found. If FD is non-NULL, *FD is set to either -1 or an open file
415 handle for the shared library.
417 The search algorithm used is described in solib_find_1's comment
420 gdb::unique_xmalloc_ptr
<char>
421 solib_find (const char *in_pathname
, int *fd
)
423 const char *solib_symbols_extension
424 = gdbarch_solib_symbols_extension (target_gdbarch ());
426 /* If solib_symbols_extension is set, replace the file's
428 if (solib_symbols_extension
!= NULL
)
430 const char *p
= in_pathname
+ strlen (in_pathname
);
432 while (p
> in_pathname
&& *p
!= '.')
440 = (char *) alloca (p
- in_pathname
+ 1
441 + strlen (solib_symbols_extension
) + 1);
442 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
443 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
444 solib_symbols_extension
);
446 in_pathname
= new_pathname
;
450 return solib_find_1 (in_pathname
, fd
, true);
453 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
454 it is used as file handle to open the file. Throws an error if the file
455 could not be opened. Handles both local and remote file access.
457 If unsuccessful, the FD will be closed (unless FD was -1). */
460 solib_bfd_fopen (const char *pathname
, int fd
)
462 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (pathname
, gnutarget
, fd
));
464 if (abfd
!= NULL
&& !gdb_bfd_has_target_filename (abfd
.get ()))
465 bfd_set_cacheable (abfd
.get (), 1);
469 /* Arrange to free PATHNAME when the error is thrown. */
470 error (_("Could not open `%s' as an executable file: %s"),
471 pathname
, bfd_errmsg (bfd_get_error ()));
477 /* Find shared library PATHNAME and open a BFD for it. */
480 solib_bfd_open (const char *pathname
)
483 const struct bfd_arch_info
*b
;
485 /* Search for shared library file. */
486 gdb::unique_xmalloc_ptr
<char> found_pathname
487 = solib_find (pathname
, &found_file
);
488 if (found_pathname
== NULL
)
490 /* Return failure if the file could not be found, so that we can
491 accumulate messages about missing libraries. */
495 perror_with_name (pathname
);
498 /* Open bfd for shared library. */
499 gdb_bfd_ref_ptr
abfd (solib_bfd_fopen (found_pathname
.get (), found_file
));
501 /* Check bfd format. */
502 if (!bfd_check_format (abfd
.get (), bfd_object
))
503 error (_("`%s': not in executable format: %s"),
504 bfd_get_filename (abfd
.get ()), bfd_errmsg (bfd_get_error ()));
506 /* Check bfd arch. */
507 b
= gdbarch_bfd_arch_info (target_gdbarch ());
508 if (!b
->compatible (b
, bfd_get_arch_info (abfd
.get ())))
509 error (_("`%s': Shared library architecture %s is not compatible "
510 "with target architecture %s."), bfd_get_filename (abfd
.get ()),
511 bfd_get_arch_info (abfd
.get ())->printable_name
,
517 /* Mapping of a core file's shared library sonames to their respective
518 build-ids. Added to the registries of core file bfds. */
520 typedef std::unordered_map
<std::string
, std::string
> soname_build_id_map
;
522 /* Key used to associate a soname_build_id_map to a core file bfd. */
524 static const struct registry
<bfd
>::key
<soname_build_id_map
>
525 cbfd_soname_build_id_data_key
;
530 set_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
,
532 const bfd_build_id
*build_id
)
534 gdb_assert (abfd
.get () != nullptr);
535 gdb_assert (soname
!= nullptr);
536 gdb_assert (build_id
!= nullptr);
538 soname_build_id_map
*mapptr
= cbfd_soname_build_id_data_key
.get (abfd
.get ());
540 if (mapptr
== nullptr)
541 mapptr
= cbfd_soname_build_id_data_key
.emplace (abfd
.get ());
543 (*mapptr
)[soname
] = build_id_to_string (build_id
);
548 gdb::unique_xmalloc_ptr
<char>
549 get_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
, const char *soname
)
551 if (abfd
.get () == nullptr || soname
== nullptr)
554 soname_build_id_map
*mapptr
555 = cbfd_soname_build_id_data_key
.get (abfd
.get ());
557 if (mapptr
== nullptr)
560 auto it
= mapptr
->find (lbasename (soname
));
561 if (it
== mapptr
->end ())
564 return make_unique_xstrdup (it
->second
.c_str ());
567 /* Given a pointer to one of the shared objects in our list of mapped
568 objects, use the recorded name to open a bfd descriptor for the
569 object, build a section table, relocate all the section addresses
570 by the base address at which the shared object was mapped, and then
571 add the sections to the target's section table.
573 FIXME: In most (all?) cases the shared object file name recorded in
574 the dynamic linkage tables will be a fully qualified pathname. For
575 cases where it isn't, do we really mimic the systems search
576 mechanism correctly in the below code (particularly the tilde
577 expansion stuff?). */
580 solib_map_sections (struct so_list
*so
)
582 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
584 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (so
->so_name
));
585 gdb_bfd_ref_ptr
abfd (ops
->bfd_open (filename
.get ()));
586 gdb::unique_xmalloc_ptr
<char> build_id_hexstr
587 = get_cbfd_soname_build_id (current_program_space
->cbfd
, so
->so_name
);
589 /* If we already know the build-id of this solib from a core file, verify
590 it matches ABFD's build-id. If there is a mismatch or the solib wasn't
591 found, attempt to query debuginfod for the correct solib. */
592 if (build_id_hexstr
.get () != nullptr)
594 bool mismatch
= false;
596 if (abfd
!= nullptr && abfd
->build_id
!= nullptr)
598 std::string build_id
= build_id_to_string (abfd
->build_id
);
600 if (build_id
!= build_id_hexstr
.get ())
603 if (abfd
== nullptr || mismatch
)
605 scoped_fd fd
= debuginfod_exec_query ((const unsigned char*)
606 build_id_hexstr
.get (),
607 0, so
->so_name
, &filename
);
610 abfd
= ops
->bfd_open (filename
.get ());
612 warning (_("Build-id of %ps does not match core file."),
613 styled_string (file_name_style
.style (), filename
.get ()));
620 /* Leave bfd open, core_xfer_memory and "info files" need it. */
621 so
->abfd
= abfd
.release ();
623 /* Copy the full path name into so_name, allowing symbol_file_add
624 to find it later. This also affects the =library-loaded GDB/MI
625 event, and in particular the part of that notification providing
626 the library's host-side path. If we let the target dictate
627 that objfile's path, and the target is different from the host,
628 GDB/MI will not provide the correct host-side path. */
629 if (strlen (bfd_get_filename (so
->abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
630 error (_("Shared library file name is too long."));
631 strcpy (so
->so_name
, bfd_get_filename (so
->abfd
));
633 if (so
->sections
== nullptr)
634 so
->sections
= new target_section_table
;
635 *so
->sections
= build_section_table (so
->abfd
);
637 for (target_section
&p
: *so
->sections
)
639 /* Relocate the section binding addresses as recorded in the shared
640 object's file by the base address to which the object was actually
642 ops
->relocate_section_addresses (so
, &p
);
644 /* If the target didn't provide information about the address
645 range of the shared object, assume we want the location of
646 the .text section. */
647 if (so
->addr_low
== 0 && so
->addr_high
== 0
648 && strcmp (p
.the_bfd_section
->name
, ".text") == 0)
650 so
->addr_low
= p
.addr
;
651 so
->addr_high
= p
.endaddr
;
655 /* Add the shared object's sections to the current set of file
656 section tables. Do this immediately after mapping the object so
657 that later nodes in the list can query this object, as is needed
659 current_program_space
->add_target_sections (so
, *so
->sections
);
664 /* Free symbol-file related contents of SO and reset for possible reloading
665 of SO. If we have opened a BFD for SO, close it. If we have placed SO's
666 sections in some target's section table, the caller is responsible for
669 This function doesn't mess with objfiles at all. If there is an
670 objfile associated with SO that needs to be removed, the caller is
671 responsible for taking care of that. */
674 clear_so (struct so_list
*so
)
676 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
681 gdb_bfd_unref (so
->abfd
);
684 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
685 so
->symbols_loaded
= 0;
688 so
->addr_low
= so
->addr_high
= 0;
690 /* Restore the target-supplied file name. SO_NAME may be the path
691 of the symbol file. */
692 strcpy (so
->so_name
, so
->so_original_name
);
694 /* Do the same for target-specific data. */
695 if (ops
->clear_so
!= NULL
)
699 /* Free the storage associated with the `struct so_list' object SO.
700 If we have opened a BFD for SO, close it.
702 The caller is responsible for removing SO from whatever list it is
703 a member of. If we have placed SO's sections in some target's
704 section table, the caller is responsible for removing them.
706 This function doesn't mess with objfiles at all. If there is an
707 objfile associated with SO that needs to be removed, the caller is
708 responsible for taking care of that. */
711 free_so (struct so_list
*so
)
713 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
722 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
723 be chatty about it. Return true if any symbols were actually loaded. */
726 solib_read_symbols (struct so_list
*so
, symfile_add_flags flags
)
728 if (so
->symbols_loaded
)
730 /* If needed, we've already warned in our caller. */
732 else if (so
->abfd
== NULL
)
734 /* We've already warned about this library, when trying to open
740 flags
|= current_inferior ()->symfile_flags
;
744 /* Have we already loaded this shared object? */
745 so
->objfile
= nullptr;
746 for (objfile
*objfile
: current_program_space
->objfiles ())
748 if (filename_cmp (objfile_name (objfile
), so
->so_name
) == 0
749 && objfile
->addr_low
== so
->addr_low
)
751 so
->objfile
= objfile
;
755 if (so
->objfile
== NULL
)
757 section_addr_info sap
758 = build_section_addr_info_from_section_table (*so
->sections
);
759 gdb_bfd_ref_ptr tmp_bfd
760 (gdb_bfd_ref_ptr::new_reference (so
->abfd
));
761 so
->objfile
= symbol_file_add_from_bfd (tmp_bfd
, so
->so_name
,
764 so
->objfile
->addr_low
= so
->addr_low
;
767 so
->symbols_loaded
= 1;
769 catch (const gdb_exception_error
&e
)
771 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
772 " library symbols for %s:\n"),
782 /* Return true if KNOWN->objfile is used by any other so_list object
783 in the list of shared libraries. Return false otherwise. */
786 solib_used (const struct so_list
*const known
)
788 for (const struct so_list
*pivot
: current_program_space
->solibs ())
789 if (pivot
!= known
&& pivot
->objfile
== known
->objfile
)
797 update_solib_list (int from_tty
)
799 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
800 struct so_list
*inferior
= ops
->current_sos();
801 struct so_list
*gdb
, **gdb_link
;
803 /* We can reach here due to changing solib-search-path or the
804 sysroot, before having any inferior. */
805 if (target_has_execution () && inferior_ptid
!= null_ptid
)
807 struct inferior
*inf
= current_inferior ();
809 /* If we are attaching to a running process for which we
810 have not opened a symbol file, we may be able to get its
813 && current_program_space
->symfile_object_file
== NULL
)
817 ops
->open_symbol_file_object (from_tty
);
819 catch (const gdb_exception
&ex
)
821 exception_fprintf (gdb_stderr
, ex
,
822 "Error reading attached "
823 "process's symbol file.\n");
828 /* GDB and the inferior's dynamic linker each maintain their own
829 list of currently loaded shared objects; we want to bring the
830 former in sync with the latter. Scan both lists, seeing which
831 shared objects appear where. There are three cases:
833 - A shared object appears on both lists. This means that GDB
834 knows about it already, and it's still loaded in the inferior.
835 Nothing needs to happen.
837 - A shared object appears only on GDB's list. This means that
838 the inferior has unloaded it. We should remove the shared
839 object from GDB's tables.
841 - A shared object appears only on the inferior's list. This
842 means that it's just been loaded. We should add it to GDB's
845 So we walk GDB's list, checking each entry to see if it appears
846 in the inferior's list too. If it does, no action is needed, and
847 we remove it from the inferior's list. If it doesn't, the
848 inferior has unloaded it, and we remove it from GDB's list. By
849 the time we're done walking GDB's list, the inferior's list
850 contains only the new shared objects, which we then add. */
852 gdb
= current_program_space
->so_list
;
853 gdb_link
= ¤t_program_space
->so_list
;
856 struct so_list
*i
= inferior
;
857 struct so_list
**i_link
= &inferior
;
859 /* Check to see whether the shared object *gdb also appears in
860 the inferior's current list. */
865 if (ops
->same (gdb
, i
))
870 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
878 /* If the shared object appears on the inferior's list too, then
879 it's still loaded, so we don't need to do anything. Delete
880 it from the inferior's list, and leave it on GDB's list. */
885 gdb_link
= &gdb
->next
;
889 /* If it's not on the inferior's list, remove it from GDB's tables. */
892 /* Notify any observer that the shared object has been
893 unloaded before we remove it from GDB's tables. */
894 gdb::observers::solib_unloaded
.notify (gdb
);
896 current_program_space
->deleted_solibs
.push_back (gdb
->so_name
);
898 *gdb_link
= gdb
->next
;
900 /* Unless the user loaded it explicitly, free SO's objfile. */
901 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
)
902 && !solib_used (gdb
))
903 gdb
->objfile
->unlink ();
905 /* Some targets' section tables might be referring to
906 sections from so->abfd; remove them. */
907 current_program_space
->remove_target_sections (gdb
);
914 /* Now the inferior's list contains only shared objects that don't
915 appear in GDB's list --- those that are newly loaded. Add them
916 to GDB's shared object list. */
920 const char *not_found_filename
= NULL
;
924 /* Add the new shared objects to GDB's list. */
925 *gdb_link
= inferior
;
927 /* Fill in the rest of each of the `struct so_list' nodes. */
928 for (i
= inferior
; i
; i
= i
->next
)
931 i
->pspace
= current_program_space
;
932 current_program_space
->added_solibs
.push_back (i
);
936 /* Fill in the rest of the `struct so_list' node. */
937 if (!solib_map_sections (i
))
940 if (not_found_filename
== NULL
)
941 not_found_filename
= i
->so_original_name
;
945 catch (const gdb_exception_error
&e
)
947 exception_fprintf (gdb_stderr
, e
,
948 _("Error while mapping shared "
949 "library sections:\n"));
952 /* Notify any observer that the shared object has been
953 loaded now that we've added it to GDB's tables. */
954 gdb::observers::solib_loaded
.notify (i
);
957 /* If a library was not found, issue an appropriate warning
958 message. We have to use a single call to warning in case the
959 front end does something special with warnings, e.g., pop up
960 a dialog box. It Would Be Nice if we could get a "warning: "
961 prefix on each line in the CLI front end, though - it doesn't
965 warning (_("Could not load shared library symbols for %s.\n"
966 "Do you need \"set solib-search-path\" "
967 "or \"set sysroot\"?"),
969 else if (not_found
> 1)
971 Could not load shared library symbols for %d libraries, e.g. %s.\n\
972 Use the \"info sharedlibrary\" command to see the complete listing.\n\
973 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
974 not_found
, not_found_filename
);
979 /* Return non-zero if NAME is the libpthread shared library.
981 Uses a fairly simplistic heuristic approach where we check
982 the file name against "/libpthread". This can lead to false
983 positives, but this should be good enough in practice.
985 As of glibc-2.34, functions formerly residing in libpthread have
986 been moved to libc, so "/libc." needs to be checked too. (Matching
987 the "." will avoid matching libraries such as libcrypt.) */
990 libpthread_name_p (const char *name
)
992 return (strstr (name
, "/libpthread") != NULL
993 || strstr (name
, "/libc.") != NULL
);
996 /* Return non-zero if SO is the libpthread shared library. */
999 libpthread_solib_p (struct so_list
*so
)
1001 return libpthread_name_p (so
->so_name
);
1004 /* Read in symbolic information for any shared objects whose names
1005 match PATTERN. (If we've already read a shared object's symbol
1006 info, leave it alone.) If PATTERN is zero, read them all.
1008 If READSYMS is 0, defer reading symbolic information until later
1009 but still do any needed low level processing.
1011 FROM_TTY is described for update_solib_list, above. */
1014 solib_add (const char *pattern
, int from_tty
, int readsyms
)
1016 if (print_symbol_loading_p (from_tty
, 0, 0))
1018 if (pattern
!= NULL
)
1020 gdb_printf (_("Loading symbols for shared libraries: %s\n"),
1024 gdb_printf (_("Loading symbols for shared libraries.\n"));
1027 current_program_space
->solib_add_generation
++;
1031 char *re_err
= re_comp (pattern
);
1034 error (_("Invalid regexp: %s"), re_err
);
1037 update_solib_list (from_tty
);
1039 /* Walk the list of currently loaded shared libraries, and read
1040 symbols for any that match the pattern --- or any whose symbols
1041 aren't already loaded, if no pattern was given. */
1043 bool any_matches
= false;
1044 bool loaded_any_symbols
= false;
1045 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1048 add_flags
|= SYMFILE_VERBOSE
;
1050 for (struct so_list
*gdb
: current_program_space
->solibs ())
1051 if (! pattern
|| re_exec (gdb
->so_name
))
1053 /* Normally, we would read the symbols from that library
1054 only if READSYMS is set. However, we're making a small
1055 exception for the pthread library, because we sometimes
1056 need the library symbols to be loaded in order to provide
1057 thread support (x86-linux for instance). */
1058 const int add_this_solib
=
1059 (readsyms
|| libpthread_solib_p (gdb
));
1064 if (gdb
->symbols_loaded
)
1066 /* If no pattern was given, be quiet for shared
1067 libraries we have already loaded. */
1068 if (pattern
&& (from_tty
|| info_verbose
))
1069 gdb_printf (_("Symbols already loaded for %s\n"),
1072 else if (solib_read_symbols (gdb
, add_flags
))
1073 loaded_any_symbols
= true;
1077 if (loaded_any_symbols
)
1078 breakpoint_re_set ();
1080 if (from_tty
&& pattern
&& ! any_matches
)
1082 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
1084 if (loaded_any_symbols
)
1086 /* Getting new symbols may change our opinion about what is
1088 reinit_frame_cache ();
1093 /* Implement the "info sharedlibrary" command. Walk through the
1094 shared library list and print information about each attached
1095 library matching PATTERN. If PATTERN is elided, print them
1099 info_sharedlibrary_command (const char *pattern
, int from_tty
)
1101 bool so_missing_debug_info
= false;
1104 struct gdbarch
*gdbarch
= target_gdbarch ();
1105 struct ui_out
*uiout
= current_uiout
;
1109 char *re_err
= re_comp (pattern
);
1112 error (_("Invalid regexp: %s"), re_err
);
1115 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1116 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1118 update_solib_list (from_tty
);
1120 /* ui_out_emit_table table_emitter needs to know the number of rows,
1121 so we need to make two passes over the libs. */
1124 for (struct so_list
*so
: current_program_space
->solibs ())
1128 if (pattern
&& ! re_exec (so
->so_name
))
1135 ui_out_emit_table
table_emitter (uiout
, 4, nr_libs
, "SharedLibraryTable");
1137 /* The "- 1" is because ui_out adds one space between columns. */
1138 uiout
->table_header (addr_width
- 1, ui_left
, "from", "From");
1139 uiout
->table_header (addr_width
- 1, ui_left
, "to", "To");
1140 uiout
->table_header (12 - 1, ui_left
, "syms-read", "Syms Read");
1141 uiout
->table_header (0, ui_noalign
, "name", "Shared Object Library");
1143 uiout
->table_body ();
1145 for (struct so_list
*so
: current_program_space
->solibs ())
1147 if (! so
->so_name
[0])
1149 if (pattern
&& ! re_exec (so
->so_name
))
1152 ui_out_emit_tuple
tuple_emitter (uiout
, "lib");
1154 if (so
->addr_high
!= 0)
1156 uiout
->field_core_addr ("from", gdbarch
, so
->addr_low
);
1157 uiout
->field_core_addr ("to", gdbarch
, so
->addr_high
);
1161 uiout
->field_skip ("from");
1162 uiout
->field_skip ("to");
1165 if (! top_level_interpreter ()->interp_ui_out ()->is_mi_like_p ()
1166 && so
->symbols_loaded
1167 && !objfile_has_symbols (so
->objfile
))
1169 so_missing_debug_info
= true;
1170 uiout
->field_string ("syms-read", "Yes (*)");
1173 uiout
->field_string ("syms-read", so
->symbols_loaded
? "Yes" : "No");
1175 uiout
->field_string ("name", so
->so_name
, file_name_style
.style ());
1184 uiout
->message (_("No shared libraries matched.\n"));
1186 uiout
->message (_("No shared libraries loaded at this time.\n"));
1190 if (so_missing_debug_info
)
1191 uiout
->message (_("(*): Shared library is missing "
1192 "debugging information.\n"));
1199 solib_contains_address_p (const struct so_list
*const solib
,
1202 if (solib
->sections
== nullptr)
1205 for (target_section
&p
: *solib
->sections
)
1206 if (p
.addr
<= address
&& address
< p
.endaddr
)
1212 /* If ADDRESS is in a shared lib in program space PSPACE, return its
1215 Provides a hook for other gdb routines to discover whether or not a
1216 particular address is within the mapped address space of a shared
1219 For example, this routine is called at one point to disable
1220 breakpoints which are in shared libraries that are not currently
1224 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1226 struct so_list
*so
= NULL
;
1228 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1229 if (solib_contains_address_p (so
, address
))
1230 return (so
->so_name
);
1238 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1240 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1242 if (ops
->keep_data_in_core
)
1243 return ops
->keep_data_in_core (vaddr
, size
) != 0;
1248 /* Called by free_all_symtabs */
1253 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1255 disable_breakpoints_in_shlibs ();
1257 while (current_program_space
->so_list
)
1259 struct so_list
*so
= current_program_space
->so_list
;
1261 current_program_space
->so_list
= so
->next
;
1262 gdb::observers::solib_unloaded
.notify (so
);
1263 current_program_space
->remove_target_sections (so
);
1267 ops
->clear_solib ();
1270 /* Shared library startup support. When GDB starts up the inferior,
1271 it nurses it along (through the shell) until it is ready to execute
1272 its first instruction. At this point, this function gets
1276 solib_create_inferior_hook (int from_tty
)
1278 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1280 ops
->solib_create_inferior_hook (from_tty
);
1286 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1288 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1290 return ops
->in_dynsym_resolve_code (pc
) != 0;
1293 /* Implements the "sharedlibrary" command. */
1296 sharedlibrary_command (const char *args
, int from_tty
)
1299 solib_add (args
, from_tty
, 1);
1302 /* Implements the command "nosharedlibrary", which discards symbols
1303 that have been auto-loaded from shared libraries. Symbols from
1304 shared libraries that were added by explicit request of the user
1305 are not discarded. Also called from remote.c. */
1308 no_shared_libraries (const char *ignored
, int from_tty
)
1310 /* The order of the two routines below is important: clear_solib notifies
1311 the solib_unloaded observers, and some of these observers might need
1312 access to their associated objfiles. Therefore, we can not purge the
1313 solibs' objfiles before clear_solib has been called. */
1316 objfile_purge_solibs ();
1322 update_solib_breakpoints (void)
1324 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1326 if (ops
->update_breakpoints
!= NULL
)
1327 ops
->update_breakpoints ();
1333 handle_solib_event (void)
1335 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1337 if (ops
->handle_event
!= NULL
)
1338 ops
->handle_event ();
1340 current_inferior ()->pspace
->clear_solib_cache ();
1342 /* Check for any newly added shared libraries if we're supposed to
1343 be adding them automatically. Switch terminal for any messages
1344 produced by breakpoint_re_set. */
1345 target_terminal::ours_for_output ();
1346 solib_add (NULL
, 0, auto_solib_add
);
1347 target_terminal::inferior ();
1350 /* Reload shared libraries, but avoid reloading the same symbol file
1351 we already have loaded. */
1354 reload_shared_libraries_1 (int from_tty
)
1356 if (print_symbol_loading_p (from_tty
, 0, 0))
1357 gdb_printf (_("Loading symbols for shared libraries.\n"));
1359 for (struct so_list
*so
: current_program_space
->solibs ())
1361 const char *found_pathname
= NULL
;
1362 bool was_loaded
= so
->symbols_loaded
!= 0;
1363 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1366 add_flags
|= SYMFILE_VERBOSE
;
1368 gdb::unique_xmalloc_ptr
<char> filename
1369 (tilde_expand (so
->so_original_name
));
1370 gdb_bfd_ref_ptr
abfd (solib_bfd_open (filename
.get ()));
1372 found_pathname
= bfd_get_filename (abfd
.get ());
1374 /* If this shared library is no longer associated with its previous
1375 symbol file, close that. */
1376 if ((found_pathname
== NULL
&& was_loaded
)
1377 || (found_pathname
!= NULL
1378 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1380 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
)
1381 && !solib_used (so
))
1382 so
->objfile
->unlink ();
1383 current_program_space
->remove_target_sections (so
);
1387 /* If this shared library is now associated with a new symbol
1389 if (found_pathname
!= NULL
1391 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1393 bool got_error
= false;
1397 solib_map_sections (so
);
1400 catch (const gdb_exception_error
&e
)
1402 exception_fprintf (gdb_stderr
, e
,
1403 _("Error while mapping "
1404 "shared library sections:\n"));
1409 && (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
)))
1410 solib_read_symbols (so
, add_flags
);
1416 reload_shared_libraries (const char *ignored
, int from_tty
,
1417 struct cmd_list_element
*e
)
1419 const struct target_so_ops
*ops
;
1421 reload_shared_libraries_1 (from_tty
);
1423 ops
= solib_ops (target_gdbarch ());
1425 /* Creating inferior hooks here has two purposes. First, if we reload
1426 shared libraries then the address of solib breakpoint we've computed
1427 previously might be no longer valid. For example, if we forgot to set
1428 solib-absolute-prefix and are setting it right now, then the previous
1429 breakpoint address is plain wrong. Second, installing solib hooks
1430 also implicitly figures were ld.so is and loads symbols for it.
1431 Absent this call, if we've just connected to a target and set
1432 solib-absolute-prefix or solib-search-path, we'll lose all information
1434 if (target_has_execution ())
1436 /* Reset or free private data structures not associated with
1438 ops
->clear_solib ();
1440 /* Remove any previous solib event breakpoint. This is usually
1441 done in common code, at breakpoint_init_inferior time, but
1442 we're not really starting up the inferior here. */
1443 remove_solib_event_breakpoints ();
1445 solib_create_inferior_hook (from_tty
);
1448 /* Sometimes the platform-specific hook loads initial shared
1449 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1450 incorrectly 0 but such solib targets should be fixed anyway. If we
1451 made all the inferior hook methods consistent, this call could be
1452 removed. Call it only after the solib target has been initialized by
1453 solib_create_inferior_hook. */
1455 solib_add (NULL
, 0, auto_solib_add
);
1457 breakpoint_re_set ();
1459 /* We may have loaded or unloaded debug info for some (or all)
1460 shared libraries. However, frames may still reference them. For
1461 example, a frame's unwinder might still point at DWARF FDE
1462 structures that are now freed. Also, getting new symbols may
1463 change our opinion about what is frameless. */
1464 reinit_frame_cache ();
1467 /* Wrapper for reload_shared_libraries that replaces "remote:"
1468 at the start of gdb_sysroot with "target:". */
1471 gdb_sysroot_changed (const char *ignored
, int from_tty
,
1472 struct cmd_list_element
*e
)
1474 const char *old_prefix
= "remote:";
1475 const char *new_prefix
= TARGET_SYSROOT_PREFIX
;
1477 if (startswith (gdb_sysroot
.c_str (), old_prefix
))
1479 static bool warning_issued
= false;
1481 gdb_assert (strlen (old_prefix
) == strlen (new_prefix
));
1482 gdb_sysroot
= new_prefix
+ gdb_sysroot
.substr (strlen (old_prefix
));
1484 if (!warning_issued
)
1486 warning (_("\"%s\" is deprecated, use \"%s\" instead."),
1487 old_prefix
, new_prefix
);
1488 warning (_("sysroot set to \"%s\"."), gdb_sysroot
.c_str ());
1490 warning_issued
= true;
1494 reload_shared_libraries (ignored
, from_tty
, e
);
1498 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1499 struct cmd_list_element
*c
, const char *value
)
1501 gdb_printf (file
, _("Autoloading of shared library symbols is %s.\n"),
1506 /* Lookup the value for a specific symbol from dynamic symbol table. Look
1507 up symbol from ABFD. MATCH_SYM is a callback function to determine
1508 whether to pick up a symbol. DATA is the input of this callback
1509 function. Return NULL if symbol is not found. */
1512 gdb_bfd_lookup_symbol_from_symtab (bfd
*abfd
,
1513 int (*match_sym
) (const asymbol
*,
1517 long storage_needed
= bfd_get_symtab_upper_bound (abfd
);
1518 CORE_ADDR symaddr
= 0;
1520 if (storage_needed
> 0)
1524 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1525 asymbol
**symbol_table
= storage
.data ();
1526 unsigned int number_of_symbols
=
1527 bfd_canonicalize_symtab (abfd
, symbol_table
);
1529 for (i
= 0; i
< number_of_symbols
; i
++)
1531 asymbol
*sym
= *symbol_table
++;
1533 if (match_sym (sym
, data
))
1535 struct gdbarch
*gdbarch
= target_gdbarch ();
1536 symaddr
= sym
->value
;
1538 /* Some ELF targets fiddle with addresses of symbols they
1539 consider special. They use minimal symbols to do that
1540 and this is needed for correct breakpoint placement,
1541 but we do not have full data here to build a complete
1542 minimal symbol, so just set the address and let the
1543 targets cope with that. */
1544 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1545 && gdbarch_elf_make_msymbol_special_p (gdbarch
))
1547 struct minimal_symbol msym
{};
1549 msym
.set_value_address (symaddr
);
1550 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, &msym
);
1551 symaddr
= msym
.value_raw_address ();
1554 /* BFD symbols are section relative. */
1555 symaddr
+= sym
->section
->vma
;
1567 gdb_bfd_scan_elf_dyntag (const int desired_dyntag
, bfd
*abfd
, CORE_ADDR
*ptr
,
1568 CORE_ADDR
*ptr_addr
)
1570 int arch_size
, step
, sect_size
;
1571 long current_dyntag
;
1572 CORE_ADDR dyn_ptr
, dyn_addr
;
1573 gdb_byte
*bufend
, *bufstart
, *buf
;
1574 Elf32_External_Dyn
*x_dynp_32
;
1575 Elf64_External_Dyn
*x_dynp_64
;
1576 struct bfd_section
*sect
;
1581 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
1584 arch_size
= bfd_get_arch_size (abfd
);
1585 if (arch_size
== -1)
1588 /* Find the start address of the .dynamic section. */
1589 sect
= bfd_get_section_by_name (abfd
, ".dynamic");
1594 for (const target_section
&target_section
1595 : current_program_space
->target_sections ())
1596 if (sect
== target_section
.the_bfd_section
)
1598 dyn_addr
= target_section
.addr
;
1604 /* ABFD may come from OBJFILE acting only as a symbol file without being
1605 loaded into the target (see add_symbol_file_command). This case is
1606 such fallback to the file VMA address without the possibility of
1607 having the section relocated to its actual in-memory address. */
1609 dyn_addr
= bfd_section_vma (sect
);
1612 /* Read in .dynamic from the BFD. We will get the actual value
1613 from memory later. */
1614 sect_size
= bfd_section_size (sect
);
1615 buf
= bufstart
= (gdb_byte
*) alloca (sect_size
);
1616 if (!bfd_get_section_contents (abfd
, sect
,
1620 /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
1621 step
= (arch_size
== 32) ? sizeof (Elf32_External_Dyn
)
1622 : sizeof (Elf64_External_Dyn
);
1623 for (bufend
= buf
+ sect_size
;
1627 if (arch_size
== 32)
1629 x_dynp_32
= (Elf32_External_Dyn
*) buf
;
1630 current_dyntag
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_tag
);
1631 dyn_ptr
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_un
.d_ptr
);
1635 x_dynp_64
= (Elf64_External_Dyn
*) buf
;
1636 current_dyntag
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_tag
);
1637 dyn_ptr
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_un
.d_ptr
);
1639 if (current_dyntag
== DT_NULL
)
1641 if (current_dyntag
== desired_dyntag
)
1643 /* If requested, try to read the runtime value of this .dynamic
1647 struct type
*ptr_type
;
1648 gdb_byte ptr_buf
[8];
1649 CORE_ADDR ptr_addr_1
;
1651 ptr_type
= builtin_type (target_gdbarch ())->builtin_data_ptr
;
1652 ptr_addr_1
= dyn_addr
+ (buf
- bufstart
) + arch_size
/ 8;
1653 if (target_read_memory (ptr_addr_1
, ptr_buf
, arch_size
/ 8) == 0)
1654 dyn_ptr
= extract_typed_address (ptr_buf
, ptr_type
);
1657 *ptr_addr
= dyn_addr
+ (buf
- bufstart
);
1668 gdb::unique_xmalloc_ptr
<char>
1669 gdb_bfd_read_elf_soname (const char *filename
)
1671 gdb_bfd_ref_ptr abfd
= gdb_bfd_open (filename
, gnutarget
);
1673 if (abfd
== nullptr)
1676 /* Check that ABFD is an ET_DYN ELF file. */
1677 if (!bfd_check_format (abfd
.get (), bfd_object
)
1678 || !(bfd_get_file_flags (abfd
.get ()) & DYNAMIC
))
1682 if (!gdb_bfd_scan_elf_dyntag (DT_SONAME
, abfd
.get (), &idx
, nullptr))
1685 struct bfd_section
*dynstr
= bfd_get_section_by_name (abfd
.get (), ".dynstr");
1686 int sect_size
= bfd_section_size (dynstr
);
1687 if (dynstr
== nullptr || sect_size
<= idx
)
1690 /* Read soname from the string table. */
1691 gdb::byte_vector dynstr_buf
;
1692 if (!gdb_bfd_get_full_section_contents (abfd
.get (), dynstr
, &dynstr_buf
))
1695 /* Ensure soname is null-terminated before returning a copy. */
1696 char *soname
= (char *) dynstr_buf
.data () + idx
;
1697 if (strnlen (soname
, sect_size
- idx
) == sect_size
- idx
)
1700 return make_unique_xstrdup (soname
);
1703 /* Lookup the value for a specific symbol from symbol table. Look up symbol
1704 from ABFD. MATCH_SYM is a callback function to determine whether to pick
1705 up a symbol. DATA is the input of this callback function. Return NULL
1706 if symbol is not found. */
1709 bfd_lookup_symbol_from_dyn_symtab (bfd
*abfd
,
1710 int (*match_sym
) (const asymbol
*,
1714 long storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
1715 CORE_ADDR symaddr
= 0;
1717 if (storage_needed
> 0)
1720 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1721 asymbol
**symbol_table
= storage
.data ();
1722 unsigned int number_of_symbols
=
1723 bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
1725 for (i
= 0; i
< number_of_symbols
; i
++)
1727 asymbol
*sym
= *symbol_table
++;
1729 if (match_sym (sym
, data
))
1731 /* BFD symbols are section relative. */
1732 symaddr
= sym
->value
+ sym
->section
->vma
;
1740 /* Lookup the value for a specific symbol from symbol table and dynamic
1741 symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
1742 function to determine whether to pick up a symbol. DATA is the
1743 input of this callback function. Return NULL if symbol is not
1747 gdb_bfd_lookup_symbol (bfd
*abfd
,
1748 int (*match_sym
) (const asymbol
*, const void *),
1751 CORE_ADDR symaddr
= gdb_bfd_lookup_symbol_from_symtab (abfd
, match_sym
, data
);
1753 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
1754 have to check the dynamic string table too. */
1756 symaddr
= bfd_lookup_symbol_from_dyn_symtab (abfd
, match_sym
, data
);
1761 /* The shared library list may contain user-loaded object files that
1762 can be removed out-of-band by the user. So upon notification of
1763 free_objfile remove all references to any user-loaded file that is
1764 about to be freed. */
1767 remove_user_added_objfile (struct objfile
*objfile
)
1769 if (objfile
!= 0 && objfile
->flags
& OBJF_USERLOADED
)
1771 for (struct so_list
*so
: current_program_space
->solibs ())
1772 if (so
->objfile
== objfile
)
1777 void _initialize_solib ();
1779 _initialize_solib ()
1781 gdb::observers::free_objfile
.attach (remove_user_added_objfile
,
1783 gdb::observers::inferior_execd
.attach ([] (inferior
*inf
)
1785 solib_create_inferior_hook (0);
1788 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1789 _("Load shared object library symbols for files matching REGEXP."));
1790 cmd_list_element
*info_sharedlibrary_cmd
1791 = add_info ("sharedlibrary", info_sharedlibrary_command
,
1792 _("Status of loaded shared object libraries."));
1793 add_info_alias ("dll", info_sharedlibrary_cmd
, 1);
1794 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1795 _("Unload all shared object library symbols."));
1797 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1798 &auto_solib_add
, _("\
1799 Set autoloading of shared library symbols."), _("\
1800 Show autoloading of shared library symbols."), _("\
1801 If \"on\", symbols from all shared object libraries will be loaded\n\
1802 automatically when the inferior begins execution, when the dynamic linker\n\
1803 informs gdb that a new library has been loaded, or when attaching to the\n\
1804 inferior. Otherwise, symbols must be loaded manually, using \
1807 show_auto_solib_add
,
1808 &setlist
, &showlist
);
1810 set_show_commands sysroot_cmds
1811 = add_setshow_optional_filename_cmd ("sysroot", class_support
,
1813 Set an alternate system root."), _("\
1814 Show the current system root."), _("\
1815 The system root is used to load absolute shared library symbol files.\n\
1816 For other (relative) files, you can add directories using\n\
1817 `set solib-search-path'."),
1818 gdb_sysroot_changed
,
1820 &setlist
, &showlist
);
1822 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.set
, class_support
, 0,
1824 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.show
, class_support
, 0,
1827 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1828 &solib_search_path
, _("\
1829 Set the search path for loading non-absolute shared library symbol files."),
1831 Show the search path for loading non-absolute shared library symbol files."),
1833 This takes precedence over the environment variables \
1834 PATH and LD_LIBRARY_PATH."),
1835 reload_shared_libraries
,
1836 show_solib_search_path
,
1837 &setlist
, &showlist
);