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"
56 #include "solib-target.h"
58 /* Architecture-specific operations. */
60 /* Per-architecture data key. */
61 static const registry
<gdbarch
>::key
<const struct target_so_ops
,
62 gdb::noop_deleter
<const struct target_so_ops
>>
65 static const struct target_so_ops
*
66 solib_ops (struct gdbarch
*gdbarch
)
68 const struct target_so_ops
*result
= solib_data
.get (gdbarch
);
69 if (result
== nullptr)
71 result
= &solib_target_so_ops
;
72 set_solib_ops (gdbarch
, &solib_target_so_ops
);
77 /* Set the solib operations for GDBARCH to NEW_OPS. */
80 set_solib_ops (struct gdbarch
*gdbarch
, const struct target_so_ops
*new_ops
)
82 solib_data
.set (gdbarch
, new_ops
);
86 /* external data declarations */
88 /* Local function prototypes */
90 /* If non-empty, this is a search path for loading non-absolute shared library
91 symbol files. This takes precedence over the environment variables PATH
92 and LD_LIBRARY_PATH. */
93 static std::string solib_search_path
;
95 show_solib_search_path (struct ui_file
*file
, int from_tty
,
96 struct cmd_list_element
*c
, const char *value
)
98 gdb_printf (file
, _("The search path for loading non-absolute "
99 "shared library symbol files is %s.\n"),
103 /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
104 #if (HAVE_DOS_BASED_FILE_SYSTEM)
105 # define DOS_BASED_FILE_SYSTEM 1
107 # define DOS_BASED_FILE_SYSTEM 0
110 /* Return the full pathname of a binary file (the main executable or a
111 shared library file), or NULL if not found. If FD is non-NULL, *FD
112 is set to either -1 or an open file handle for the binary file.
114 Global variable GDB_SYSROOT is used as a prefix directory
115 to search for binary files if they have an absolute path.
116 If GDB_SYSROOT starts with "target:" and target filesystem
117 is the local filesystem then the "target:" prefix will be
118 stripped before the search starts. This ensures that the
119 same search algorithm is used for local files regardless of
120 whether a "target:" prefix was used.
122 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
123 (or set of directories, as in LD_LIBRARY_PATH) to search for all
124 shared libraries if not found in either the sysroot (if set) or
125 the local filesystem. SOLIB_SEARCH_PATH is not used when searching
126 for the main executable.
129 * If a sysroot is set and path is absolute:
130 * Search for sysroot/path.
132 * Look for it literally (unmodified).
133 * If IS_SOLIB is non-zero:
134 * Look in SOLIB_SEARCH_PATH.
135 * If available, use target defined search function.
136 * If NO sysroot is set, perform the following two searches:
137 * Look in inferior's $PATH.
138 * If IS_SOLIB is non-zero:
139 * Look in inferior's $LD_LIBRARY_PATH.
141 * The last check avoids doing this search when targeting remote
142 * machines since a sysroot will almost always be set.
145 static gdb::unique_xmalloc_ptr
<char>
146 solib_find_1 (const char *in_pathname
, int *fd
, bool is_solib
)
148 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
150 gdb::unique_xmalloc_ptr
<char> temp_pathname
;
151 const char *fskind
= effective_target_file_system_kind ();
152 const char *sysroot
= gdb_sysroot
.c_str ();
153 int prefix_len
, orig_prefix_len
;
155 /* If the absolute prefix starts with "target:" but the filesystem
156 accessed by the target_fileio_* methods is the local filesystem
157 then we strip the "target:" prefix now and work with the local
158 filesystem. This ensures that the same search algorithm is used
159 for all local files regardless of whether a "target:" prefix was
161 if (is_target_filename (sysroot
) && target_filesystem_is_local ())
162 sysroot
+= strlen (TARGET_SYSROOT_PREFIX
);
164 /* Strip any trailing slashes from the absolute prefix. */
165 prefix_len
= orig_prefix_len
= strlen (sysroot
);
167 while (prefix_len
> 0 && IS_DIR_SEPARATOR (sysroot
[prefix_len
- 1]))
170 std::string sysroot_holder
;
173 else if (prefix_len
!= orig_prefix_len
)
175 sysroot_holder
= std::string (sysroot
, prefix_len
);
176 sysroot
= sysroot_holder
.c_str ();
179 /* If we're on a non-DOS-based system, backslashes won't be
180 understood as directory separator, so, convert them to forward
181 slashes, iff we're supposed to handle DOS-based file system
182 semantics for target paths. */
183 if (!DOS_BASED_FILE_SYSTEM
&& fskind
== file_system_kind_dos_based
)
187 /* Avoid clobbering our input. */
188 p
= (char *) alloca (strlen (in_pathname
) + 1);
189 strcpy (p
, in_pathname
);
199 /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
200 IS_ABSOLUTE_PATH. The latter is for host paths only, while
201 IN_PATHNAME is a target path. For example, if we're supposed to
202 be handling DOS-like semantics we want to consider a
203 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
204 With such a path, before giving up on the sysroot, we'll try:
206 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
207 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
208 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
211 if (!IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
) || sysroot
== NULL
)
212 temp_pathname
.reset (xstrdup (in_pathname
));
215 bool need_dir_separator
;
217 /* Concatenate the sysroot and the target reported filename. We
218 may need to glue them with a directory separator. Cases to
221 | sysroot | separator | in_pathname |
222 |-----------------+-----------+----------------|
223 | /some/dir | / | c:/foo/bar.dll |
224 | /some/dir | | /foo/bar.dll |
225 | target: | | c:/foo/bar.dll |
226 | target: | | /foo/bar.dll |
227 | target:some/dir | / | c:/foo/bar.dll |
228 | target:some/dir | | /foo/bar.dll |
230 IOW, we don't need to add a separator if IN_PATHNAME already
231 has one, or when the sysroot is exactly "target:".
232 There's no need to check for drive spec explicitly, as we only
233 get here if IN_PATHNAME is considered an absolute path. */
234 need_dir_separator
= !(IS_DIR_SEPARATOR (in_pathname
[0])
235 || strcmp (TARGET_SYSROOT_PREFIX
, sysroot
) == 0);
237 /* Cat the prefixed pathname together. */
238 temp_pathname
.reset (concat (sysroot
,
239 need_dir_separator
? SLASH_STRING
: "",
240 in_pathname
, (char *) NULL
));
243 /* Handle files to be accessed via the target. */
244 if (is_target_filename (temp_pathname
.get ()))
248 return temp_pathname
;
251 /* Now see if we can open it. */
252 found_file
= gdb_open_cloexec (temp_pathname
.get (),
253 O_RDONLY
| O_BINARY
, 0).release ();
255 /* If the search in gdb_sysroot failed, and the path name has a
256 drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
257 and retrying in the sysroot:
258 c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
262 && HAS_TARGET_DRIVE_SPEC (fskind
, in_pathname
))
264 bool need_dir_separator
= !IS_DIR_SEPARATOR (in_pathname
[2]);
265 char drive
[2] = { in_pathname
[0], '\0' };
267 temp_pathname
.reset (concat (sysroot
,
270 need_dir_separator
? SLASH_STRING
: "",
271 in_pathname
+ 2, (char *) NULL
));
273 found_file
= gdb_open_cloexec (temp_pathname
.get (),
274 O_RDONLY
| O_BINARY
, 0).release ();
277 /* If the search in gdb_sysroot still failed, try fully
278 stripping the drive spec, and trying once more in the
279 sysroot before giving up.
281 c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
283 temp_pathname
.reset (concat (sysroot
,
284 need_dir_separator
? SLASH_STRING
: "",
285 in_pathname
+ 2, (char *) NULL
));
287 found_file
= gdb_open_cloexec (temp_pathname
.get (),
288 O_RDONLY
| O_BINARY
, 0).release ();
292 /* We try to find the library in various ways. After each attempt,
293 either found_file >= 0 and temp_pathname is a malloc'd string, or
294 found_file < 0 and temp_pathname does not point to storage that
295 needs to be freed. */
298 temp_pathname
.reset (NULL
);
300 /* If the search in gdb_sysroot failed, and the path name is
301 absolute at this point, make it relative. (openp will try and open the
302 file according to its absolute path otherwise, which is not what we want.)
303 Affects subsequent searches for this solib. */
304 if (found_file
< 0 && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
306 /* First, get rid of any drive letters etc. */
307 while (!IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
310 /* Next, get rid of all leading dir separators. */
311 while (IS_TARGET_DIR_SEPARATOR (fskind
, *in_pathname
))
315 /* If not found, and we're looking for a solib, search the
316 solib_search_path (if any). */
317 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
318 found_file
= openp (solib_search_path
.c_str (),
319 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
320 in_pathname
, O_RDONLY
| O_BINARY
, &temp_pathname
);
322 /* If not found, and we're looking for a solib, next search the
323 solib_search_path (if any) for the basename only (ignoring the
324 path). This is to allow reading solibs from a path that differs
325 from the opened path. */
326 if (is_solib
&& found_file
< 0 && !solib_search_path
.empty ())
327 found_file
= openp (solib_search_path
.c_str (),
328 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
,
329 target_lbasename (fskind
, in_pathname
),
330 O_RDONLY
| O_BINARY
, &temp_pathname
);
332 /* If not found, and we're looking for a solib, try to use target
333 supplied solib search method. */
334 if (is_solib
&& found_file
< 0 && ops
->find_and_open_solib
)
335 found_file
= ops
->find_and_open_solib (in_pathname
, O_RDONLY
| O_BINARY
,
338 /* If not found, next search the inferior's $PATH environment variable. */
339 if (found_file
< 0 && sysroot
== NULL
)
340 found_file
= openp (current_inferior ()->environment
.get ("PATH"),
341 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
342 O_RDONLY
| O_BINARY
, &temp_pathname
);
344 /* If not found, and we're looking for a solib, next search the
345 inferior's $LD_LIBRARY_PATH environment variable. */
346 if (is_solib
&& found_file
< 0 && sysroot
== NULL
)
347 found_file
= openp (current_inferior ()->environment
.get
349 OPF_TRY_CWD_FIRST
| OPF_RETURN_REALPATH
, in_pathname
,
350 O_RDONLY
| O_BINARY
, &temp_pathname
);
360 return temp_pathname
;
363 /* Return the full pathname of the main executable, or NULL if not
364 found. If FD is non-NULL, *FD is set to either -1 or an open file
365 handle for the main executable. */
367 gdb::unique_xmalloc_ptr
<char>
368 exec_file_find (const char *in_pathname
, int *fd
)
370 gdb::unique_xmalloc_ptr
<char> result
;
371 const char *fskind
= effective_target_file_system_kind ();
373 if (in_pathname
== NULL
)
376 if (!gdb_sysroot
.empty () && IS_TARGET_ABSOLUTE_PATH (fskind
, in_pathname
))
378 result
= solib_find_1 (in_pathname
, fd
, false);
380 if (result
== NULL
&& fskind
== file_system_kind_dos_based
)
384 new_pathname
= (char *) alloca (strlen (in_pathname
) + 5);
385 strcpy (new_pathname
, in_pathname
);
386 strcat (new_pathname
, ".exe");
388 result
= solib_find_1 (new_pathname
, fd
, false);
393 /* It's possible we don't have a full path, but rather just a
394 filename. Some targets, such as HP-UX, don't provide the
397 Attempt to qualify the filename against the source path.
398 (If that fails, we'll just fall back on the original
399 filename. Not much more we can do...) */
401 if (!source_full_path_of (in_pathname
, &result
))
402 result
.reset (xstrdup (in_pathname
));
410 /* Return the full pathname of a shared library file, or NULL if not
411 found. If FD is non-NULL, *FD is set to either -1 or an open file
412 handle for the shared library.
414 The search algorithm used is described in solib_find_1's comment
417 gdb::unique_xmalloc_ptr
<char>
418 solib_find (const char *in_pathname
, int *fd
)
420 const char *solib_symbols_extension
421 = gdbarch_solib_symbols_extension (target_gdbarch ());
423 /* If solib_symbols_extension is set, replace the file's
425 if (solib_symbols_extension
!= NULL
)
427 const char *p
= in_pathname
+ strlen (in_pathname
);
429 while (p
> in_pathname
&& *p
!= '.')
437 = (char *) alloca (p
- in_pathname
+ 1
438 + strlen (solib_symbols_extension
) + 1);
439 memcpy (new_pathname
, in_pathname
, p
- in_pathname
+ 1);
440 strcpy (new_pathname
+ (p
- in_pathname
) + 1,
441 solib_symbols_extension
);
443 in_pathname
= new_pathname
;
447 return solib_find_1 (in_pathname
, fd
, true);
450 /* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
451 it is used as file handle to open the file. Throws an error if the file
452 could not be opened. Handles both local and remote file access.
454 If unsuccessful, the FD will be closed (unless FD was -1). */
457 solib_bfd_fopen (const char *pathname
, int fd
)
459 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (pathname
, gnutarget
, fd
));
461 if (abfd
!= NULL
&& !gdb_bfd_has_target_filename (abfd
.get ()))
462 bfd_set_cacheable (abfd
.get (), 1);
466 /* Arrange to free PATHNAME when the error is thrown. */
467 error (_("Could not open `%s' as an executable file: %s"),
468 pathname
, bfd_errmsg (bfd_get_error ()));
474 /* Find shared library PATHNAME and open a BFD for it. */
477 solib_bfd_open (const char *pathname
)
480 const struct bfd_arch_info
*b
;
482 /* Search for shared library file. */
483 gdb::unique_xmalloc_ptr
<char> found_pathname
484 = solib_find (pathname
, &found_file
);
485 if (found_pathname
== NULL
)
487 /* Return failure if the file could not be found, so that we can
488 accumulate messages about missing libraries. */
492 perror_with_name (pathname
);
495 /* Open bfd for shared library. */
496 gdb_bfd_ref_ptr
abfd (solib_bfd_fopen (found_pathname
.get (), found_file
));
498 /* Check bfd format. */
499 if (!bfd_check_format (abfd
.get (), bfd_object
))
500 error (_("`%s': not in executable format: %s"),
501 bfd_get_filename (abfd
.get ()), bfd_errmsg (bfd_get_error ()));
503 /* Check bfd arch. */
504 b
= gdbarch_bfd_arch_info (target_gdbarch ());
505 if (!b
->compatible (b
, bfd_get_arch_info (abfd
.get ())))
506 error (_("`%s': Shared library architecture %s is not compatible "
507 "with target architecture %s."), bfd_get_filename (abfd
.get ()),
508 bfd_get_arch_info (abfd
.get ())->printable_name
,
514 /* Mapping of a core file's shared library sonames to their respective
515 build-ids. Added to the registries of core file bfds. */
517 typedef std::unordered_map
<std::string
, std::string
> soname_build_id_map
;
519 /* Key used to associate a soname_build_id_map to a core file bfd. */
521 static const struct registry
<bfd
>::key
<soname_build_id_map
>
522 cbfd_soname_build_id_data_key
;
527 set_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
,
529 const bfd_build_id
*build_id
)
531 gdb_assert (abfd
.get () != nullptr);
532 gdb_assert (soname
!= nullptr);
533 gdb_assert (build_id
!= nullptr);
535 soname_build_id_map
*mapptr
= cbfd_soname_build_id_data_key
.get (abfd
.get ());
537 if (mapptr
== nullptr)
538 mapptr
= cbfd_soname_build_id_data_key
.emplace (abfd
.get ());
540 (*mapptr
)[soname
] = build_id_to_string (build_id
);
545 gdb::unique_xmalloc_ptr
<char>
546 get_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd
, const char *soname
)
548 if (abfd
.get () == nullptr || soname
== nullptr)
551 soname_build_id_map
*mapptr
552 = cbfd_soname_build_id_data_key
.get (abfd
.get ());
554 if (mapptr
== nullptr)
557 auto it
= mapptr
->find (lbasename (soname
));
558 if (it
== mapptr
->end ())
561 return make_unique_xstrdup (it
->second
.c_str ());
564 /* Given a pointer to one of the shared objects in our list of mapped
565 objects, use the recorded name to open a bfd descriptor for the
566 object, build a section table, relocate all the section addresses
567 by the base address at which the shared object was mapped, and then
568 add the sections to the target's section table.
570 FIXME: In most (all?) cases the shared object file name recorded in
571 the dynamic linkage tables will be a fully qualified pathname. For
572 cases where it isn't, do we really mimic the systems search
573 mechanism correctly in the below code (particularly the tilde
574 expansion stuff?). */
577 solib_map_sections (struct so_list
*so
)
579 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
581 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (so
->so_name
));
582 gdb_bfd_ref_ptr
abfd (ops
->bfd_open (filename
.get ()));
583 gdb::unique_xmalloc_ptr
<char> build_id_hexstr
584 = get_cbfd_soname_build_id (current_program_space
->cbfd
, so
->so_name
);
586 /* If we already know the build-id of this solib from a core file, verify
587 it matches ABFD's build-id. If there is a mismatch or the solib wasn't
588 found, attempt to query debuginfod for the correct solib. */
589 if (build_id_hexstr
.get () != nullptr)
591 bool mismatch
= false;
593 if (abfd
!= nullptr && abfd
->build_id
!= nullptr)
595 std::string build_id
= build_id_to_string (abfd
->build_id
);
597 if (build_id
!= build_id_hexstr
.get ())
600 if (abfd
== nullptr || mismatch
)
602 scoped_fd fd
= debuginfod_exec_query ((const unsigned char*)
603 build_id_hexstr
.get (),
604 0, so
->so_name
, &filename
);
607 abfd
= ops
->bfd_open (filename
.get ());
609 warning (_("Build-id of %ps does not match core file."),
610 styled_string (file_name_style
.style (), filename
.get ()));
617 /* Leave bfd open, core_xfer_memory and "info files" need it. */
618 so
->abfd
= abfd
.release ();
620 /* Copy the full path name into so_name, allowing symbol_file_add
621 to find it later. This also affects the =library-loaded GDB/MI
622 event, and in particular the part of that notification providing
623 the library's host-side path. If we let the target dictate
624 that objfile's path, and the target is different from the host,
625 GDB/MI will not provide the correct host-side path. */
626 if (strlen (bfd_get_filename (so
->abfd
)) >= SO_NAME_MAX_PATH_SIZE
)
627 error (_("Shared library file name is too long."));
628 strcpy (so
->so_name
, bfd_get_filename (so
->abfd
));
630 if (so
->sections
== nullptr)
631 so
->sections
= new target_section_table
;
632 *so
->sections
= build_section_table (so
->abfd
);
634 for (target_section
&p
: *so
->sections
)
636 /* Relocate the section binding addresses as recorded in the shared
637 object's file by the base address to which the object was actually
639 ops
->relocate_section_addresses (so
, &p
);
641 /* If the target didn't provide information about the address
642 range of the shared object, assume we want the location of
643 the .text section. */
644 if (so
->addr_low
== 0 && so
->addr_high
== 0
645 && strcmp (p
.the_bfd_section
->name
, ".text") == 0)
647 so
->addr_low
= p
.addr
;
648 so
->addr_high
= p
.endaddr
;
652 /* Add the shared object's sections to the current set of file
653 section tables. Do this immediately after mapping the object so
654 that later nodes in the list can query this object, as is needed
656 current_program_space
->add_target_sections (so
, *so
->sections
);
661 /* Free symbol-file related contents of SO and reset for possible reloading
662 of SO. If we have opened a BFD for SO, close it. If we have placed SO's
663 sections in some target's section table, the caller is responsible for
666 This function doesn't mess with objfiles at all. If there is an
667 objfile associated with SO that needs to be removed, the caller is
668 responsible for taking care of that. */
671 clear_so (struct so_list
*so
)
673 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
678 gdb_bfd_unref (so
->abfd
);
681 /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
682 so
->symbols_loaded
= 0;
685 so
->addr_low
= so
->addr_high
= 0;
687 /* Restore the target-supplied file name. SO_NAME may be the path
688 of the symbol file. */
689 strcpy (so
->so_name
, so
->so_original_name
);
691 /* Do the same for target-specific data. */
692 if (ops
->clear_so
!= NULL
)
696 /* Free the storage associated with the `struct so_list' object SO.
697 If we have opened a BFD for SO, close it.
699 The caller is responsible for removing SO from whatever list it is
700 a member of. If we have placed SO's sections in some target's
701 section table, the caller is responsible for removing them.
703 This function doesn't mess with objfiles at all. If there is an
704 objfile associated with SO that needs to be removed, the caller is
705 responsible for taking care of that. */
708 free_so (struct so_list
*so
)
710 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
719 /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
720 be chatty about it. Return true if any symbols were actually loaded. */
723 solib_read_symbols (struct so_list
*so
, symfile_add_flags flags
)
725 if (so
->symbols_loaded
)
727 /* If needed, we've already warned in our caller. */
729 else if (so
->abfd
== NULL
)
731 /* We've already warned about this library, when trying to open
737 flags
|= current_inferior ()->symfile_flags
;
741 /* Have we already loaded this shared object? */
742 so
->objfile
= nullptr;
743 for (objfile
*objfile
: current_program_space
->objfiles ())
745 if (filename_cmp (objfile_name (objfile
), so
->so_name
) == 0
746 && objfile
->addr_low
== so
->addr_low
)
748 so
->objfile
= objfile
;
752 if (so
->objfile
== NULL
)
754 section_addr_info sap
755 = build_section_addr_info_from_section_table (*so
->sections
);
756 gdb_bfd_ref_ptr tmp_bfd
757 (gdb_bfd_ref_ptr::new_reference (so
->abfd
));
758 so
->objfile
= symbol_file_add_from_bfd (tmp_bfd
, so
->so_name
,
761 so
->objfile
->addr_low
= so
->addr_low
;
764 so
->symbols_loaded
= 1;
766 catch (const gdb_exception_error
&e
)
768 exception_fprintf (gdb_stderr
, e
, _("Error while reading shared"
769 " library symbols for %s:\n"),
779 /* Return true if KNOWN->objfile is used by any other so_list object
780 in the list of shared libraries. Return false otherwise. */
783 solib_used (const struct so_list
*const known
)
785 for (const struct so_list
*pivot
: current_program_space
->solibs ())
786 if (pivot
!= known
&& pivot
->objfile
== known
->objfile
)
794 update_solib_list (int from_tty
)
796 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
797 struct so_list
*inferior
= ops
->current_sos();
798 struct so_list
*gdb
, **gdb_link
;
800 /* We can reach here due to changing solib-search-path or the
801 sysroot, before having any inferior. */
802 if (target_has_execution () && inferior_ptid
!= null_ptid
)
804 struct inferior
*inf
= current_inferior ();
806 /* If we are attaching to a running process for which we
807 have not opened a symbol file, we may be able to get its
810 && current_program_space
->symfile_object_file
== NULL
)
814 ops
->open_symbol_file_object (from_tty
);
816 catch (const gdb_exception
&ex
)
818 exception_fprintf (gdb_stderr
, ex
,
819 "Error reading attached "
820 "process's symbol file.\n");
825 /* GDB and the inferior's dynamic linker each maintain their own
826 list of currently loaded shared objects; we want to bring the
827 former in sync with the latter. Scan both lists, seeing which
828 shared objects appear where. There are three cases:
830 - A shared object appears on both lists. This means that GDB
831 knows about it already, and it's still loaded in the inferior.
832 Nothing needs to happen.
834 - A shared object appears only on GDB's list. This means that
835 the inferior has unloaded it. We should remove the shared
836 object from GDB's tables.
838 - A shared object appears only on the inferior's list. This
839 means that it's just been loaded. We should add it to GDB's
842 So we walk GDB's list, checking each entry to see if it appears
843 in the inferior's list too. If it does, no action is needed, and
844 we remove it from the inferior's list. If it doesn't, the
845 inferior has unloaded it, and we remove it from GDB's list. By
846 the time we're done walking GDB's list, the inferior's list
847 contains only the new shared objects, which we then add. */
849 gdb
= current_program_space
->so_list
;
850 gdb_link
= ¤t_program_space
->so_list
;
853 struct so_list
*i
= inferior
;
854 struct so_list
**i_link
= &inferior
;
856 /* Check to see whether the shared object *gdb also appears in
857 the inferior's current list. */
862 if (ops
->same (gdb
, i
))
867 if (! filename_cmp (gdb
->so_original_name
, i
->so_original_name
))
875 /* If the shared object appears on the inferior's list too, then
876 it's still loaded, so we don't need to do anything. Delete
877 it from the inferior's list, and leave it on GDB's list. */
882 gdb_link
= &gdb
->next
;
886 /* If it's not on the inferior's list, remove it from GDB's tables. */
889 /* Notify any observer that the shared object has been
890 unloaded before we remove it from GDB's tables. */
891 gdb::observers::solib_unloaded
.notify (gdb
);
893 current_program_space
->deleted_solibs
.push_back (gdb
->so_name
);
895 *gdb_link
= gdb
->next
;
897 /* Unless the user loaded it explicitly, free SO's objfile. */
898 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
)
899 && !solib_used (gdb
))
900 gdb
->objfile
->unlink ();
902 /* Some targets' section tables might be referring to
903 sections from so->abfd; remove them. */
904 current_program_space
->remove_target_sections (gdb
);
911 /* Now the inferior's list contains only shared objects that don't
912 appear in GDB's list --- those that are newly loaded. Add them
913 to GDB's shared object list. */
917 const char *not_found_filename
= NULL
;
921 /* Add the new shared objects to GDB's list. */
922 *gdb_link
= inferior
;
924 /* Fill in the rest of each of the `struct so_list' nodes. */
925 for (i
= inferior
; i
; i
= i
->next
)
928 i
->pspace
= current_program_space
;
929 current_program_space
->added_solibs
.push_back (i
);
933 /* Fill in the rest of the `struct so_list' node. */
934 if (!solib_map_sections (i
))
937 if (not_found_filename
== NULL
)
938 not_found_filename
= i
->so_original_name
;
942 catch (const gdb_exception_error
&e
)
944 exception_fprintf (gdb_stderr
, e
,
945 _("Error while mapping shared "
946 "library sections:\n"));
949 /* Notify any observer that the shared object has been
950 loaded now that we've added it to GDB's tables. */
951 gdb::observers::solib_loaded
.notify (i
);
954 /* If a library was not found, issue an appropriate warning
955 message. We have to use a single call to warning in case the
956 front end does something special with warnings, e.g., pop up
957 a dialog box. It Would Be Nice if we could get a "warning: "
958 prefix on each line in the CLI front end, though - it doesn't
962 warning (_("Could not load shared library symbols for %s.\n"
963 "Do you need \"set solib-search-path\" "
964 "or \"set sysroot\"?"),
966 else if (not_found
> 1)
968 Could not load shared library symbols for %d libraries, e.g. %s.\n\
969 Use the \"info sharedlibrary\" command to see the complete listing.\n\
970 Do you need \"set solib-search-path\" or \"set sysroot\"?"),
971 not_found
, not_found_filename
);
976 /* Return non-zero if NAME is the libpthread shared library.
978 Uses a fairly simplistic heuristic approach where we check
979 the file name against "/libpthread". This can lead to false
980 positives, but this should be good enough in practice.
982 As of glibc-2.34, functions formerly residing in libpthread have
983 been moved to libc, so "/libc." needs to be checked too. (Matching
984 the "." will avoid matching libraries such as libcrypt.) */
987 libpthread_name_p (const char *name
)
989 return (strstr (name
, "/libpthread") != NULL
990 || strstr (name
, "/libc.") != NULL
);
993 /* Return non-zero if SO is the libpthread shared library. */
996 libpthread_solib_p (struct so_list
*so
)
998 return libpthread_name_p (so
->so_name
);
1001 /* Read in symbolic information for any shared objects whose names
1002 match PATTERN. (If we've already read a shared object's symbol
1003 info, leave it alone.) If PATTERN is zero, read them all.
1005 If READSYMS is 0, defer reading symbolic information until later
1006 but still do any needed low level processing.
1008 FROM_TTY is described for update_solib_list, above. */
1011 solib_add (const char *pattern
, int from_tty
, int readsyms
)
1013 if (print_symbol_loading_p (from_tty
, 0, 0))
1015 if (pattern
!= NULL
)
1017 gdb_printf (_("Loading symbols for shared libraries: %s\n"),
1021 gdb_printf (_("Loading symbols for shared libraries.\n"));
1024 current_program_space
->solib_add_generation
++;
1028 char *re_err
= re_comp (pattern
);
1031 error (_("Invalid regexp: %s"), re_err
);
1034 update_solib_list (from_tty
);
1036 /* Walk the list of currently loaded shared libraries, and read
1037 symbols for any that match the pattern --- or any whose symbols
1038 aren't already loaded, if no pattern was given. */
1040 bool any_matches
= false;
1041 bool loaded_any_symbols
= false;
1042 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1045 add_flags
|= SYMFILE_VERBOSE
;
1047 for (struct so_list
*gdb
: current_program_space
->solibs ())
1048 if (! pattern
|| re_exec (gdb
->so_name
))
1050 /* Normally, we would read the symbols from that library
1051 only if READSYMS is set. However, we're making a small
1052 exception for the pthread library, because we sometimes
1053 need the library symbols to be loaded in order to provide
1054 thread support (x86-linux for instance). */
1055 const int add_this_solib
=
1056 (readsyms
|| libpthread_solib_p (gdb
));
1061 if (gdb
->symbols_loaded
)
1063 /* If no pattern was given, be quiet for shared
1064 libraries we have already loaded. */
1065 if (pattern
&& (from_tty
|| info_verbose
))
1066 gdb_printf (_("Symbols already loaded for %s\n"),
1069 else if (solib_read_symbols (gdb
, add_flags
))
1070 loaded_any_symbols
= true;
1074 if (loaded_any_symbols
)
1075 breakpoint_re_set ();
1077 if (from_tty
&& pattern
&& ! any_matches
)
1079 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
1081 if (loaded_any_symbols
)
1083 /* Getting new symbols may change our opinion about what is
1085 reinit_frame_cache ();
1090 /* Implement the "info sharedlibrary" command. Walk through the
1091 shared library list and print information about each attached
1092 library matching PATTERN. If PATTERN is elided, print them
1096 info_sharedlibrary_command (const char *pattern
, int from_tty
)
1098 bool so_missing_debug_info
= false;
1101 struct gdbarch
*gdbarch
= target_gdbarch ();
1102 struct ui_out
*uiout
= current_uiout
;
1106 char *re_err
= re_comp (pattern
);
1109 error (_("Invalid regexp: %s"), re_err
);
1112 /* "0x", a little whitespace, and two hex digits per byte of pointers. */
1113 addr_width
= 4 + (gdbarch_ptr_bit (gdbarch
) / 4);
1115 update_solib_list (from_tty
);
1117 /* ui_out_emit_table table_emitter needs to know the number of rows,
1118 so we need to make two passes over the libs. */
1121 for (struct so_list
*so
: current_program_space
->solibs ())
1125 if (pattern
&& ! re_exec (so
->so_name
))
1132 ui_out_emit_table
table_emitter (uiout
, 4, nr_libs
, "SharedLibraryTable");
1134 /* The "- 1" is because ui_out adds one space between columns. */
1135 uiout
->table_header (addr_width
- 1, ui_left
, "from", "From");
1136 uiout
->table_header (addr_width
- 1, ui_left
, "to", "To");
1137 uiout
->table_header (12 - 1, ui_left
, "syms-read", "Syms Read");
1138 uiout
->table_header (0, ui_noalign
, "name", "Shared Object Library");
1140 uiout
->table_body ();
1142 for (struct so_list
*so
: current_program_space
->solibs ())
1144 if (! so
->so_name
[0])
1146 if (pattern
&& ! re_exec (so
->so_name
))
1149 ui_out_emit_tuple
tuple_emitter (uiout
, "lib");
1151 if (so
->addr_high
!= 0)
1153 uiout
->field_core_addr ("from", gdbarch
, so
->addr_low
);
1154 uiout
->field_core_addr ("to", gdbarch
, so
->addr_high
);
1158 uiout
->field_skip ("from");
1159 uiout
->field_skip ("to");
1162 if (! top_level_interpreter ()->interp_ui_out ()->is_mi_like_p ()
1163 && so
->symbols_loaded
1164 && !objfile_has_symbols (so
->objfile
))
1166 so_missing_debug_info
= true;
1167 uiout
->field_string ("syms-read", "Yes (*)");
1170 uiout
->field_string ("syms-read", so
->symbols_loaded
? "Yes" : "No");
1172 uiout
->field_string ("name", so
->so_name
, file_name_style
.style ());
1181 uiout
->message (_("No shared libraries matched.\n"));
1183 uiout
->message (_("No shared libraries loaded at this time.\n"));
1187 if (so_missing_debug_info
)
1188 uiout
->message (_("(*): Shared library is missing "
1189 "debugging information.\n"));
1196 solib_contains_address_p (const struct so_list
*const solib
,
1199 if (solib
->sections
== nullptr)
1202 for (target_section
&p
: *solib
->sections
)
1203 if (p
.addr
<= address
&& address
< p
.endaddr
)
1209 /* If ADDRESS is in a shared lib in program space PSPACE, return its
1212 Provides a hook for other gdb routines to discover whether or not a
1213 particular address is within the mapped address space of a shared
1216 For example, this routine is called at one point to disable
1217 breakpoints which are in shared libraries that are not currently
1221 solib_name_from_address (struct program_space
*pspace
, CORE_ADDR address
)
1223 struct so_list
*so
= NULL
;
1225 for (so
= pspace
->so_list
; so
; so
= so
->next
)
1226 if (solib_contains_address_p (so
, address
))
1227 return (so
->so_name
);
1235 solib_keep_data_in_core (CORE_ADDR vaddr
, unsigned long size
)
1237 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1239 if (ops
->keep_data_in_core
)
1240 return ops
->keep_data_in_core (vaddr
, size
) != 0;
1245 /* Called by free_all_symtabs */
1250 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1252 disable_breakpoints_in_shlibs ();
1254 while (current_program_space
->so_list
)
1256 struct so_list
*so
= current_program_space
->so_list
;
1258 current_program_space
->so_list
= so
->next
;
1259 gdb::observers::solib_unloaded
.notify (so
);
1260 current_program_space
->remove_target_sections (so
);
1264 ops
->clear_solib ();
1267 /* Shared library startup support. When GDB starts up the inferior,
1268 it nurses it along (through the shell) until it is ready to execute
1269 its first instruction. At this point, this function gets
1273 solib_create_inferior_hook (int from_tty
)
1275 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1277 ops
->solib_create_inferior_hook (from_tty
);
1283 in_solib_dynsym_resolve_code (CORE_ADDR pc
)
1285 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1287 return ops
->in_dynsym_resolve_code (pc
) != 0;
1290 /* Implements the "sharedlibrary" command. */
1293 sharedlibrary_command (const char *args
, int from_tty
)
1296 solib_add (args
, from_tty
, 1);
1299 /* Implements the command "nosharedlibrary", which discards symbols
1300 that have been auto-loaded from shared libraries. Symbols from
1301 shared libraries that were added by explicit request of the user
1302 are not discarded. Also called from remote.c. */
1305 no_shared_libraries (const char *ignored
, int from_tty
)
1307 /* The order of the two routines below is important: clear_solib notifies
1308 the solib_unloaded observers, and some of these observers might need
1309 access to their associated objfiles. Therefore, we can not purge the
1310 solibs' objfiles before clear_solib has been called. */
1313 objfile_purge_solibs ();
1319 update_solib_breakpoints (void)
1321 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1323 if (ops
->update_breakpoints
!= NULL
)
1324 ops
->update_breakpoints ();
1330 handle_solib_event (void)
1332 const struct target_so_ops
*ops
= solib_ops (target_gdbarch ());
1334 if (ops
->handle_event
!= NULL
)
1335 ops
->handle_event ();
1337 current_inferior ()->pspace
->clear_solib_cache ();
1339 /* Check for any newly added shared libraries if we're supposed to
1340 be adding them automatically. Switch terminal for any messages
1341 produced by breakpoint_re_set. */
1342 target_terminal::ours_for_output ();
1343 solib_add (NULL
, 0, auto_solib_add
);
1344 target_terminal::inferior ();
1347 /* Reload shared libraries, but avoid reloading the same symbol file
1348 we already have loaded. */
1351 reload_shared_libraries_1 (int from_tty
)
1353 if (print_symbol_loading_p (from_tty
, 0, 0))
1354 gdb_printf (_("Loading symbols for shared libraries.\n"));
1356 for (struct so_list
*so
: current_program_space
->solibs ())
1358 const char *found_pathname
= NULL
;
1359 bool was_loaded
= so
->symbols_loaded
!= 0;
1360 symfile_add_flags add_flags
= SYMFILE_DEFER_BP_RESET
;
1363 add_flags
|= SYMFILE_VERBOSE
;
1365 gdb::unique_xmalloc_ptr
<char> filename
1366 (tilde_expand (so
->so_original_name
));
1367 gdb_bfd_ref_ptr
abfd (solib_bfd_open (filename
.get ()));
1369 found_pathname
= bfd_get_filename (abfd
.get ());
1371 /* If this shared library is no longer associated with its previous
1372 symbol file, close that. */
1373 if ((found_pathname
== NULL
&& was_loaded
)
1374 || (found_pathname
!= NULL
1375 && filename_cmp (found_pathname
, so
->so_name
) != 0))
1377 if (so
->objfile
&& ! (so
->objfile
->flags
& OBJF_USERLOADED
)
1378 && !solib_used (so
))
1379 so
->objfile
->unlink ();
1380 current_program_space
->remove_target_sections (so
);
1384 /* If this shared library is now associated with a new symbol
1386 if (found_pathname
!= NULL
1388 || filename_cmp (found_pathname
, so
->so_name
) != 0))
1390 bool got_error
= false;
1394 solib_map_sections (so
);
1397 catch (const gdb_exception_error
&e
)
1399 exception_fprintf (gdb_stderr
, e
,
1400 _("Error while mapping "
1401 "shared library sections:\n"));
1406 && (auto_solib_add
|| was_loaded
|| libpthread_solib_p (so
)))
1407 solib_read_symbols (so
, add_flags
);
1413 reload_shared_libraries (const char *ignored
, int from_tty
,
1414 struct cmd_list_element
*e
)
1416 const struct target_so_ops
*ops
;
1418 reload_shared_libraries_1 (from_tty
);
1420 ops
= solib_ops (target_gdbarch ());
1422 /* Creating inferior hooks here has two purposes. First, if we reload
1423 shared libraries then the address of solib breakpoint we've computed
1424 previously might be no longer valid. For example, if we forgot to set
1425 solib-absolute-prefix and are setting it right now, then the previous
1426 breakpoint address is plain wrong. Second, installing solib hooks
1427 also implicitly figures were ld.so is and loads symbols for it.
1428 Absent this call, if we've just connected to a target and set
1429 solib-absolute-prefix or solib-search-path, we'll lose all information
1431 if (target_has_execution ())
1433 /* Reset or free private data structures not associated with
1435 ops
->clear_solib ();
1437 /* Remove any previous solib event breakpoint. This is usually
1438 done in common code, at breakpoint_init_inferior time, but
1439 we're not really starting up the inferior here. */
1440 remove_solib_event_breakpoints ();
1442 solib_create_inferior_hook (from_tty
);
1445 /* Sometimes the platform-specific hook loads initial shared
1446 libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
1447 incorrectly 0 but such solib targets should be fixed anyway. If we
1448 made all the inferior hook methods consistent, this call could be
1449 removed. Call it only after the solib target has been initialized by
1450 solib_create_inferior_hook. */
1452 solib_add (NULL
, 0, auto_solib_add
);
1454 breakpoint_re_set ();
1456 /* We may have loaded or unloaded debug info for some (or all)
1457 shared libraries. However, frames may still reference them. For
1458 example, a frame's unwinder might still point at DWARF FDE
1459 structures that are now freed. Also, getting new symbols may
1460 change our opinion about what is frameless. */
1461 reinit_frame_cache ();
1464 /* Wrapper for reload_shared_libraries that replaces "remote:"
1465 at the start of gdb_sysroot with "target:". */
1468 gdb_sysroot_changed (const char *ignored
, int from_tty
,
1469 struct cmd_list_element
*e
)
1471 const char *old_prefix
= "remote:";
1472 const char *new_prefix
= TARGET_SYSROOT_PREFIX
;
1474 if (startswith (gdb_sysroot
.c_str (), old_prefix
))
1476 static bool warning_issued
= false;
1478 gdb_assert (strlen (old_prefix
) == strlen (new_prefix
));
1479 gdb_sysroot
= new_prefix
+ gdb_sysroot
.substr (strlen (old_prefix
));
1481 if (!warning_issued
)
1483 warning (_("\"%s\" is deprecated, use \"%s\" instead."),
1484 old_prefix
, new_prefix
);
1485 warning (_("sysroot set to \"%s\"."), gdb_sysroot
.c_str ());
1487 warning_issued
= true;
1491 reload_shared_libraries (ignored
, from_tty
, e
);
1495 show_auto_solib_add (struct ui_file
*file
, int from_tty
,
1496 struct cmd_list_element
*c
, const char *value
)
1498 gdb_printf (file
, _("Autoloading of shared library symbols is %s.\n"),
1503 /* Lookup the value for a specific symbol from dynamic symbol table. Look
1504 up symbol from ABFD. MATCH_SYM is a callback function to determine
1505 whether to pick up a symbol. DATA is the input of this callback
1506 function. Return NULL if symbol is not found. */
1509 gdb_bfd_lookup_symbol_from_symtab (bfd
*abfd
,
1510 int (*match_sym
) (const asymbol
*,
1514 long storage_needed
= bfd_get_symtab_upper_bound (abfd
);
1515 CORE_ADDR symaddr
= 0;
1517 if (storage_needed
> 0)
1521 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1522 asymbol
**symbol_table
= storage
.data ();
1523 unsigned int number_of_symbols
=
1524 bfd_canonicalize_symtab (abfd
, symbol_table
);
1526 for (i
= 0; i
< number_of_symbols
; i
++)
1528 asymbol
*sym
= *symbol_table
++;
1530 if (match_sym (sym
, data
))
1532 struct gdbarch
*gdbarch
= target_gdbarch ();
1533 symaddr
= sym
->value
;
1535 /* Some ELF targets fiddle with addresses of symbols they
1536 consider special. They use minimal symbols to do that
1537 and this is needed for correct breakpoint placement,
1538 but we do not have full data here to build a complete
1539 minimal symbol, so just set the address and let the
1540 targets cope with that. */
1541 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1542 && gdbarch_elf_make_msymbol_special_p (gdbarch
))
1544 struct minimal_symbol msym
{};
1546 msym
.set_value_address (symaddr
);
1547 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, &msym
);
1548 symaddr
= msym
.value_raw_address ();
1551 /* BFD symbols are section relative. */
1552 symaddr
+= sym
->section
->vma
;
1564 gdb_bfd_scan_elf_dyntag (const int desired_dyntag
, bfd
*abfd
, CORE_ADDR
*ptr
,
1565 CORE_ADDR
*ptr_addr
)
1567 int arch_size
, step
, sect_size
;
1568 long current_dyntag
;
1569 CORE_ADDR dyn_ptr
, dyn_addr
;
1570 gdb_byte
*bufend
, *bufstart
, *buf
;
1571 Elf32_External_Dyn
*x_dynp_32
;
1572 Elf64_External_Dyn
*x_dynp_64
;
1573 struct bfd_section
*sect
;
1578 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
1581 arch_size
= bfd_get_arch_size (abfd
);
1582 if (arch_size
== -1)
1585 /* Find the start address of the .dynamic section. */
1586 sect
= bfd_get_section_by_name (abfd
, ".dynamic");
1591 for (const target_section
&target_section
1592 : current_program_space
->target_sections ())
1593 if (sect
== target_section
.the_bfd_section
)
1595 dyn_addr
= target_section
.addr
;
1601 /* ABFD may come from OBJFILE acting only as a symbol file without being
1602 loaded into the target (see add_symbol_file_command). This case is
1603 such fallback to the file VMA address without the possibility of
1604 having the section relocated to its actual in-memory address. */
1606 dyn_addr
= bfd_section_vma (sect
);
1609 /* Read in .dynamic from the BFD. We will get the actual value
1610 from memory later. */
1611 sect_size
= bfd_section_size (sect
);
1612 buf
= bufstart
= (gdb_byte
*) alloca (sect_size
);
1613 if (!bfd_get_section_contents (abfd
, sect
,
1617 /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
1618 step
= (arch_size
== 32) ? sizeof (Elf32_External_Dyn
)
1619 : sizeof (Elf64_External_Dyn
);
1620 for (bufend
= buf
+ sect_size
;
1624 if (arch_size
== 32)
1626 x_dynp_32
= (Elf32_External_Dyn
*) buf
;
1627 current_dyntag
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_tag
);
1628 dyn_ptr
= bfd_h_get_32 (abfd
, (bfd_byte
*) x_dynp_32
->d_un
.d_ptr
);
1632 x_dynp_64
= (Elf64_External_Dyn
*) buf
;
1633 current_dyntag
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_tag
);
1634 dyn_ptr
= bfd_h_get_64 (abfd
, (bfd_byte
*) x_dynp_64
->d_un
.d_ptr
);
1636 if (current_dyntag
== DT_NULL
)
1638 if (current_dyntag
== desired_dyntag
)
1640 /* If requested, try to read the runtime value of this .dynamic
1644 struct type
*ptr_type
;
1645 gdb_byte ptr_buf
[8];
1646 CORE_ADDR ptr_addr_1
;
1648 ptr_type
= builtin_type (target_gdbarch ())->builtin_data_ptr
;
1649 ptr_addr_1
= dyn_addr
+ (buf
- bufstart
) + arch_size
/ 8;
1650 if (target_read_memory (ptr_addr_1
, ptr_buf
, arch_size
/ 8) == 0)
1651 dyn_ptr
= extract_typed_address (ptr_buf
, ptr_type
);
1654 *ptr_addr
= dyn_addr
+ (buf
- bufstart
);
1665 gdb::unique_xmalloc_ptr
<char>
1666 gdb_bfd_read_elf_soname (const char *filename
)
1668 gdb_bfd_ref_ptr abfd
= gdb_bfd_open (filename
, gnutarget
);
1670 if (abfd
== nullptr)
1673 /* Check that ABFD is an ET_DYN ELF file. */
1674 if (!bfd_check_format (abfd
.get (), bfd_object
)
1675 || !(bfd_get_file_flags (abfd
.get ()) & DYNAMIC
))
1679 if (!gdb_bfd_scan_elf_dyntag (DT_SONAME
, abfd
.get (), &idx
, nullptr))
1682 struct bfd_section
*dynstr
= bfd_get_section_by_name (abfd
.get (), ".dynstr");
1683 int sect_size
= bfd_section_size (dynstr
);
1684 if (dynstr
== nullptr || sect_size
<= idx
)
1687 /* Read soname from the string table. */
1688 gdb::byte_vector dynstr_buf
;
1689 if (!gdb_bfd_get_full_section_contents (abfd
.get (), dynstr
, &dynstr_buf
))
1692 /* Ensure soname is null-terminated before returning a copy. */
1693 char *soname
= (char *) dynstr_buf
.data () + idx
;
1694 if (strnlen (soname
, sect_size
- idx
) == sect_size
- idx
)
1697 return make_unique_xstrdup (soname
);
1700 /* Lookup the value for a specific symbol from symbol table. Look up symbol
1701 from ABFD. MATCH_SYM is a callback function to determine whether to pick
1702 up a symbol. DATA is the input of this callback function. Return NULL
1703 if symbol is not found. */
1706 bfd_lookup_symbol_from_dyn_symtab (bfd
*abfd
,
1707 int (*match_sym
) (const asymbol
*,
1711 long storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
1712 CORE_ADDR symaddr
= 0;
1714 if (storage_needed
> 0)
1717 gdb::def_vector
<asymbol
*> storage (storage_needed
/ sizeof (asymbol
*));
1718 asymbol
**symbol_table
= storage
.data ();
1719 unsigned int number_of_symbols
=
1720 bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
1722 for (i
= 0; i
< number_of_symbols
; i
++)
1724 asymbol
*sym
= *symbol_table
++;
1726 if (match_sym (sym
, data
))
1728 /* BFD symbols are section relative. */
1729 symaddr
= sym
->value
+ sym
->section
->vma
;
1737 /* Lookup the value for a specific symbol from symbol table and dynamic
1738 symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
1739 function to determine whether to pick up a symbol. DATA is the
1740 input of this callback function. Return NULL if symbol is not
1744 gdb_bfd_lookup_symbol (bfd
*abfd
,
1745 int (*match_sym
) (const asymbol
*, const void *),
1748 CORE_ADDR symaddr
= gdb_bfd_lookup_symbol_from_symtab (abfd
, match_sym
, data
);
1750 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
1751 have to check the dynamic string table too. */
1753 symaddr
= bfd_lookup_symbol_from_dyn_symtab (abfd
, match_sym
, data
);
1758 /* The shared library list may contain user-loaded object files that
1759 can be removed out-of-band by the user. So upon notification of
1760 free_objfile remove all references to any user-loaded file that is
1761 about to be freed. */
1764 remove_user_added_objfile (struct objfile
*objfile
)
1766 if (objfile
!= 0 && objfile
->flags
& OBJF_USERLOADED
)
1768 for (struct so_list
*so
: current_program_space
->solibs ())
1769 if (so
->objfile
== objfile
)
1774 void _initialize_solib ();
1776 _initialize_solib ()
1778 gdb::observers::free_objfile
.attach (remove_user_added_objfile
,
1780 gdb::observers::inferior_execd
.attach ([] (inferior
*inf
)
1782 solib_create_inferior_hook (0);
1785 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1786 _("Load shared object library symbols for files matching REGEXP."));
1787 cmd_list_element
*info_sharedlibrary_cmd
1788 = add_info ("sharedlibrary", info_sharedlibrary_command
,
1789 _("Status of loaded shared object libraries."));
1790 add_info_alias ("dll", info_sharedlibrary_cmd
, 1);
1791 add_com ("nosharedlibrary", class_files
, no_shared_libraries
,
1792 _("Unload all shared object library symbols."));
1794 add_setshow_boolean_cmd ("auto-solib-add", class_support
,
1795 &auto_solib_add
, _("\
1796 Set autoloading of shared library symbols."), _("\
1797 Show autoloading of shared library symbols."), _("\
1798 If \"on\", symbols from all shared object libraries will be loaded\n\
1799 automatically when the inferior begins execution, when the dynamic linker\n\
1800 informs gdb that a new library has been loaded, or when attaching to the\n\
1801 inferior. Otherwise, symbols must be loaded manually, using \
1804 show_auto_solib_add
,
1805 &setlist
, &showlist
);
1807 set_show_commands sysroot_cmds
1808 = add_setshow_optional_filename_cmd ("sysroot", class_support
,
1810 Set an alternate system root."), _("\
1811 Show the current system root."), _("\
1812 The system root is used to load absolute shared library symbol files.\n\
1813 For other (relative) files, you can add directories using\n\
1814 `set solib-search-path'."),
1815 gdb_sysroot_changed
,
1817 &setlist
, &showlist
);
1819 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.set
, class_support
, 0,
1821 add_alias_cmd ("solib-absolute-prefix", sysroot_cmds
.show
, class_support
, 0,
1824 add_setshow_optional_filename_cmd ("solib-search-path", class_support
,
1825 &solib_search_path
, _("\
1826 Set the search path for loading non-absolute shared library symbol files."),
1828 Show the search path for loading non-absolute shared library symbol files."),
1830 This takes precedence over the environment variables \
1831 PATH and LD_LIBRARY_PATH."),
1832 reload_shared_libraries
,
1833 show_solib_search_path
,
1834 &setlist
, &showlist
);