1597 lines
48 KiB
C
1597 lines
48 KiB
C
/* Handle shared libraries for GDB, the GNU Debugger.
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Copyright (C) 1990-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include <sys/types.h>
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#include <fcntl.h>
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#include <string.h>
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#include "symtab.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "exceptions.h"
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#include "gdbcore.h"
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#include "command.h"
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#include "target.h"
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#include "frame.h"
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#include "gdb_regex.h"
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#include "inferior.h"
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#include "environ.h"
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#include "language.h"
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#include "gdbcmd.h"
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#include "completer.h"
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#include "filenames.h" /* for DOSish file names */
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#include "exec.h"
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#include "solist.h"
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#include "observer.h"
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#include "readline/readline.h"
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#include "remote.h"
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#include "solib.h"
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#include "interps.h"
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#include "filesystem.h"
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#include "gdb_bfd.h"
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#include "filestuff.h"
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/* Architecture-specific operations. */
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/* Per-architecture data key. */
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static struct gdbarch_data *solib_data;
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static void *
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solib_init (struct obstack *obstack)
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{
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struct target_so_ops **ops;
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ops = OBSTACK_ZALLOC (obstack, struct target_so_ops *);
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*ops = current_target_so_ops;
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return ops;
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}
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static const struct target_so_ops *
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solib_ops (struct gdbarch *gdbarch)
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{
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const struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
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return *ops;
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}
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/* Set the solib operations for GDBARCH to NEW_OPS. */
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void
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set_solib_ops (struct gdbarch *gdbarch, const struct target_so_ops *new_ops)
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{
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const struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
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*ops = new_ops;
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}
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/* external data declarations */
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/* FIXME: gdbarch needs to control this variable, or else every
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configuration needs to call set_solib_ops. */
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struct target_so_ops *current_target_so_ops;
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/* List of known shared objects */
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#define so_list_head current_program_space->so_list
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/* Local function prototypes */
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/* If non-empty, this is a search path for loading non-absolute shared library
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symbol files. This takes precedence over the environment variables PATH
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and LD_LIBRARY_PATH. */
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static char *solib_search_path = NULL;
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static void
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show_solib_search_path (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("The search path for loading non-absolute "
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"shared library symbol files is %s.\n"),
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value);
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}
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/* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
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#if (HAVE_DOS_BASED_FILE_SYSTEM)
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# define DOS_BASED_FILE_SYSTEM 1
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#else
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# define DOS_BASED_FILE_SYSTEM 0
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#endif
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/* Returns the full pathname of the shared library file, or NULL if
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not found. (The pathname is malloc'ed; it needs to be freed by the
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caller.) *FD is set to either -1 or an open file handle for the
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library.
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Global variable GDB_SYSROOT is used as a prefix directory
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to search for shared libraries if they have an absolute path.
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Global variable SOLIB_SEARCH_PATH is used as a prefix directory
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(or set of directories, as in LD_LIBRARY_PATH) to search for all
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shared libraries if not found in GDB_SYSROOT.
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Search algorithm:
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* If there is a gdb_sysroot and path is absolute:
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* Search for gdb_sysroot/path.
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* else
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* Look for it literally (unmodified).
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* Look in SOLIB_SEARCH_PATH.
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* If available, use target defined search function.
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* If gdb_sysroot is NOT set, perform the following two searches:
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* Look in inferior's $PATH.
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* Look in inferior's $LD_LIBRARY_PATH.
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*
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* The last check avoids doing this search when targetting remote
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* machines since gdb_sysroot will almost always be set.
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*/
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char *
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solib_find (char *in_pathname, int *fd)
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{
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const struct target_so_ops *ops = solib_ops (target_gdbarch ());
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int found_file = -1;
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char *temp_pathname = NULL;
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int gdb_sysroot_is_empty;
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const char *solib_symbols_extension
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= gdbarch_solib_symbols_extension (target_gdbarch ());
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const char *fskind = effective_target_file_system_kind ();
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struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
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char *sysroot = NULL;
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/* If solib_symbols_extension is set, replace the file's
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extension. */
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if (solib_symbols_extension)
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{
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char *p = in_pathname + strlen (in_pathname);
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while (p > in_pathname && *p != '.')
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p--;
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if (*p == '.')
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{
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char *new_pathname;
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new_pathname = alloca (p - in_pathname + 1
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+ strlen (solib_symbols_extension) + 1);
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memcpy (new_pathname, in_pathname, p - in_pathname + 1);
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strcpy (new_pathname + (p - in_pathname) + 1,
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solib_symbols_extension);
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in_pathname = new_pathname;
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}
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}
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gdb_sysroot_is_empty = (gdb_sysroot == NULL || *gdb_sysroot == 0);
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if (!gdb_sysroot_is_empty)
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{
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int prefix_len = strlen (gdb_sysroot);
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/* Remove trailing slashes from absolute prefix. */
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while (prefix_len > 0
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&& IS_DIR_SEPARATOR (gdb_sysroot[prefix_len - 1]))
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prefix_len--;
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sysroot = savestring (gdb_sysroot, prefix_len);
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make_cleanup (xfree, sysroot);
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}
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/* If we're on a non-DOS-based system, backslashes won't be
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understood as directory separator, so, convert them to forward
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slashes, iff we're supposed to handle DOS-based file system
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semantics for target paths. */
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if (!DOS_BASED_FILE_SYSTEM && fskind == file_system_kind_dos_based)
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{
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char *p;
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/* Avoid clobbering our input. */
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p = alloca (strlen (in_pathname) + 1);
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strcpy (p, in_pathname);
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in_pathname = p;
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for (; *p; p++)
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{
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if (*p == '\\')
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*p = '/';
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}
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}
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/* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
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IS_ABSOLUTE_PATH. The latter is for host paths only, while
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IN_PATHNAME is a target path. For example, if we're supposed to
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be handling DOS-like semantics we want to consider a
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'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
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With such a path, before giving up on the sysroot, we'll try:
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1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
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2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
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3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
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*/
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if (!IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname) || gdb_sysroot_is_empty)
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temp_pathname = xstrdup (in_pathname);
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else
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{
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int need_dir_separator;
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/* Concatenate the sysroot and the target reported filename. We
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may need to glue them with a directory separator. Cases to
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consider:
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| sysroot | separator | in_pathname |
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|-----------------+-----------+----------------|
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| /some/dir | / | c:/foo/bar.dll |
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| /some/dir | | /foo/bar.dll |
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| remote: | | c:/foo/bar.dll |
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| remote: | | /foo/bar.dll |
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| remote:some/dir | / | c:/foo/bar.dll |
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| remote:some/dir | | /foo/bar.dll |
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IOW, we don't need to add a separator if IN_PATHNAME already
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has one, or when the the sysroot is exactly "remote:".
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There's no need to check for drive spec explicitly, as we only
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get here if IN_PATHNAME is considered an absolute path. */
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need_dir_separator = !(IS_DIR_SEPARATOR (in_pathname[0])
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|| strcmp (REMOTE_SYSROOT_PREFIX, sysroot) == 0);
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/* Cat the prefixed pathname together. */
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temp_pathname = concat (sysroot,
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need_dir_separator ? SLASH_STRING : "",
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in_pathname, (char *) NULL);
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}
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/* Handle remote files. */
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if (remote_filename_p (temp_pathname))
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{
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*fd = -1;
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do_cleanups (old_chain);
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return temp_pathname;
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}
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/* Now see if we can open it. */
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found_file = gdb_open_cloexec (temp_pathname, O_RDONLY | O_BINARY, 0);
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if (found_file < 0)
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xfree (temp_pathname);
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/* If the search in gdb_sysroot failed, and the path name has a
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drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
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and retrying in the sysroot:
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c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
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if (found_file < 0
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&& !gdb_sysroot_is_empty
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&& HAS_TARGET_DRIVE_SPEC (fskind, in_pathname))
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{
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int need_dir_separator = !IS_DIR_SEPARATOR (in_pathname[2]);
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char *drive = savestring (in_pathname, 1);
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temp_pathname = concat (sysroot,
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SLASH_STRING,
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drive,
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need_dir_separator ? SLASH_STRING : "",
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in_pathname + 2, (char *) NULL);
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xfree (drive);
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found_file = gdb_open_cloexec (temp_pathname, O_RDONLY | O_BINARY, 0);
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if (found_file < 0)
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{
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xfree (temp_pathname);
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/* If the search in gdb_sysroot still failed, try fully
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stripping the drive spec, and trying once more in the
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sysroot before giving up.
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c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
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temp_pathname = concat (sysroot,
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need_dir_separator ? SLASH_STRING : "",
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in_pathname + 2, (char *) NULL);
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found_file = gdb_open_cloexec (temp_pathname, O_RDONLY | O_BINARY, 0);
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if (found_file < 0)
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xfree (temp_pathname);
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}
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}
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do_cleanups (old_chain);
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/* We try to find the library in various ways. After each attempt,
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either found_file >= 0 and temp_pathname is a malloc'd string, or
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found_file < 0 and temp_pathname does not point to storage that
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needs to be freed. */
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if (found_file < 0)
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temp_pathname = NULL;
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/* If the search in gdb_sysroot failed, and the path name is
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absolute at this point, make it relative. (openp will try and open the
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file according to its absolute path otherwise, which is not what we want.)
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Affects subsequent searches for this solib. */
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if (found_file < 0 && IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname))
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{
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/* First, get rid of any drive letters etc. */
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while (!IS_TARGET_DIR_SEPARATOR (fskind, *in_pathname))
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in_pathname++;
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/* Next, get rid of all leading dir separators. */
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while (IS_TARGET_DIR_SEPARATOR (fskind, *in_pathname))
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in_pathname++;
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}
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/* If not found, search the solib_search_path (if any). */
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if (found_file < 0 && solib_search_path != NULL)
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found_file = openp (solib_search_path,
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OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
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in_pathname, O_RDONLY | O_BINARY, &temp_pathname);
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/* If not found, next search the solib_search_path (if any) for the basename
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only (ignoring the path). This is to allow reading solibs from a path
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that differs from the opened path. */
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if (found_file < 0 && solib_search_path != NULL)
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found_file = openp (solib_search_path,
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OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
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target_lbasename (fskind, in_pathname),
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O_RDONLY | O_BINARY, &temp_pathname);
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/* If not found, try to use target supplied solib search method. */
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if (found_file < 0 && ops->find_and_open_solib)
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found_file = ops->find_and_open_solib (in_pathname, O_RDONLY | O_BINARY,
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&temp_pathname);
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/* If not found, next search the inferior's $PATH environment variable. */
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if (found_file < 0 && gdb_sysroot_is_empty)
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found_file = openp (get_in_environ (current_inferior ()->environment,
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"PATH"),
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OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, in_pathname,
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O_RDONLY | O_BINARY, &temp_pathname);
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/* If not found, next search the inferior's $LD_LIBRARY_PATH
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environment variable. */
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if (found_file < 0 && gdb_sysroot_is_empty)
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found_file = openp (get_in_environ (current_inferior ()->environment,
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"LD_LIBRARY_PATH"),
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OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, in_pathname,
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O_RDONLY | O_BINARY, &temp_pathname);
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*fd = found_file;
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return temp_pathname;
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}
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/* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
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it is used as file handle to open the file. Throws an error if the file
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could not be opened. Handles both local and remote file access.
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PATHNAME must be malloc'ed by the caller. It will be freed by this
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function. If unsuccessful, the FD will be closed (unless FD was
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-1). */
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bfd *
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solib_bfd_fopen (char *pathname, int fd)
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{
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bfd *abfd;
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if (remote_filename_p (pathname))
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{
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gdb_assert (fd == -1);
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abfd = remote_bfd_open (pathname, gnutarget);
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}
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else
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{
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abfd = gdb_bfd_open (pathname, gnutarget, fd);
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if (abfd)
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bfd_set_cacheable (abfd, 1);
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||
}
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||
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if (!abfd)
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||
{
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make_cleanup (xfree, pathname);
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||
error (_("Could not open `%s' as an executable file: %s"),
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pathname, bfd_errmsg (bfd_get_error ()));
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||
}
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||
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xfree (pathname);
|
||
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||
return abfd;
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}
|
||
|
||
/* Find shared library PATHNAME and open a BFD for it. */
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bfd *
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solib_bfd_open (char *pathname)
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||
{
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||
char *found_pathname;
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||
int found_file;
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||
bfd *abfd;
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||
const struct bfd_arch_info *b;
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||
|
||
/* Search for shared library file. */
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||
found_pathname = solib_find (pathname, &found_file);
|
||
if (found_pathname == NULL)
|
||
{
|
||
/* Return failure if the file could not be found, so that we can
|
||
accumulate messages about missing libraries. */
|
||
if (errno == ENOENT)
|
||
return NULL;
|
||
|
||
perror_with_name (pathname);
|
||
}
|
||
|
||
/* Open bfd for shared library. */
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abfd = solib_bfd_fopen (found_pathname, found_file);
|
||
|
||
/* Check bfd format. */
|
||
if (!bfd_check_format (abfd, bfd_object))
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||
{
|
||
make_cleanup_bfd_unref (abfd);
|
||
error (_("`%s': not in executable format: %s"),
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bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
|
||
}
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||
|
||
/* Check bfd arch. */
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||
b = gdbarch_bfd_arch_info (target_gdbarch ());
|
||
if (!b->compatible (b, bfd_get_arch_info (abfd)))
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||
warning (_("`%s': Shared library architecture %s is not compatible "
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||
"with target architecture %s."), bfd_get_filename (abfd),
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||
bfd_get_arch_info (abfd)->printable_name, b->printable_name);
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||
|
||
return abfd;
|
||
}
|
||
|
||
/* Given a pointer to one of the shared objects in our list of mapped
|
||
objects, use the recorded name to open a bfd descriptor for the
|
||
object, build a section table, relocate all the section addresses
|
||
by the base address at which the shared object was mapped, and then
|
||
add the sections to the target's section table.
|
||
|
||
FIXME: In most (all?) cases the shared object file name recorded in
|
||
the dynamic linkage tables will be a fully qualified pathname. For
|
||
cases where it isn't, do we really mimic the systems search
|
||
mechanism correctly in the below code (particularly the tilde
|
||
expansion stuff?). */
|
||
|
||
static int
|
||
solib_map_sections (struct so_list *so)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
char *filename;
|
||
struct target_section *p;
|
||
struct cleanup *old_chain;
|
||
bfd *abfd;
|
||
|
||
filename = tilde_expand (so->so_name);
|
||
old_chain = make_cleanup (xfree, filename);
|
||
abfd = ops->bfd_open (filename);
|
||
do_cleanups (old_chain);
|
||
|
||
if (abfd == NULL)
|
||
return 0;
|
||
|
||
/* Leave bfd open, core_xfer_memory and "info files" need it. */
|
||
so->abfd = abfd;
|
||
|
||
/* Copy the full path name into so_name, allowing symbol_file_add
|
||
to find it later. This also affects the =library-loaded GDB/MI
|
||
event, and in particular the part of that notification providing
|
||
the library's host-side path. If we let the target dictate
|
||
that objfile's path, and the target is different from the host,
|
||
GDB/MI will not provide the correct host-side path. */
|
||
if (strlen (bfd_get_filename (abfd)) >= SO_NAME_MAX_PATH_SIZE)
|
||
error (_("Shared library file name is too long."));
|
||
strcpy (so->so_name, bfd_get_filename (abfd));
|
||
|
||
if (build_section_table (abfd, &so->sections, &so->sections_end))
|
||
{
|
||
error (_("Can't find the file sections in `%s': %s"),
|
||
bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
|
||
}
|
||
|
||
for (p = so->sections; p < so->sections_end; p++)
|
||
{
|
||
/* Relocate the section binding addresses as recorded in the shared
|
||
object's file by the base address to which the object was actually
|
||
mapped. */
|
||
ops->relocate_section_addresses (so, p);
|
||
|
||
/* If the target didn't provide information about the address
|
||
range of the shared object, assume we want the location of
|
||
the .text section. */
|
||
if (so->addr_low == 0 && so->addr_high == 0
|
||
&& strcmp (p->the_bfd_section->name, ".text") == 0)
|
||
{
|
||
so->addr_low = p->addr;
|
||
so->addr_high = p->endaddr;
|
||
}
|
||
}
|
||
|
||
/* Add the shared object's sections to the current set of file
|
||
section tables. Do this immediately after mapping the object so
|
||
that later nodes in the list can query this object, as is needed
|
||
in solib-osf.c. */
|
||
add_target_sections (so, so->sections, so->sections_end);
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Free symbol-file related contents of SO and reset for possible reloading
|
||
of SO. If we have opened a BFD for SO, close it. If we have placed SO's
|
||
sections in some target's section table, the caller is responsible for
|
||
removing them.
|
||
|
||
This function doesn't mess with objfiles at all. If there is an
|
||
objfile associated with SO that needs to be removed, the caller is
|
||
responsible for taking care of that. */
|
||
|
||
static void
|
||
clear_so (struct so_list *so)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
if (so->sections)
|
||
{
|
||
xfree (so->sections);
|
||
so->sections = so->sections_end = NULL;
|
||
}
|
||
|
||
gdb_bfd_unref (so->abfd);
|
||
so->abfd = NULL;
|
||
|
||
/* Our caller closed the objfile, possibly via objfile_purge_solibs. */
|
||
so->symbols_loaded = 0;
|
||
so->objfile = NULL;
|
||
|
||
so->addr_low = so->addr_high = 0;
|
||
|
||
/* Restore the target-supplied file name. SO_NAME may be the path
|
||
of the symbol file. */
|
||
strcpy (so->so_name, so->so_original_name);
|
||
|
||
/* Do the same for target-specific data. */
|
||
if (ops->clear_so != NULL)
|
||
ops->clear_so (so);
|
||
}
|
||
|
||
/* Free the storage associated with the `struct so_list' object SO.
|
||
If we have opened a BFD for SO, close it.
|
||
|
||
The caller is responsible for removing SO from whatever list it is
|
||
a member of. If we have placed SO's sections in some target's
|
||
section table, the caller is responsible for removing them.
|
||
|
||
This function doesn't mess with objfiles at all. If there is an
|
||
objfile associated with SO that needs to be removed, the caller is
|
||
responsible for taking care of that. */
|
||
|
||
void
|
||
free_so (struct so_list *so)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
clear_so (so);
|
||
ops->free_so (so);
|
||
|
||
xfree (so);
|
||
}
|
||
|
||
|
||
/* Return address of first so_list entry in master shared object list. */
|
||
struct so_list *
|
||
master_so_list (void)
|
||
{
|
||
return so_list_head;
|
||
}
|
||
|
||
/* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
|
||
be chatty about it. Return non-zero if any symbols were actually
|
||
loaded. */
|
||
|
||
int
|
||
solib_read_symbols (struct so_list *so, int flags)
|
||
{
|
||
const int from_tty = flags & SYMFILE_VERBOSE;
|
||
|
||
if (so->symbols_loaded)
|
||
{
|
||
/* If needed, we've already warned in our caller. */
|
||
}
|
||
else if (so->abfd == NULL)
|
||
{
|
||
/* We've already warned about this library, when trying to open
|
||
it. */
|
||
}
|
||
else
|
||
{
|
||
volatile struct gdb_exception e;
|
||
|
||
flags |= current_inferior ()->symfile_flags;
|
||
|
||
TRY_CATCH (e, RETURN_MASK_ERROR)
|
||
{
|
||
struct section_addr_info *sap;
|
||
|
||
/* Have we already loaded this shared object? */
|
||
ALL_OBJFILES (so->objfile)
|
||
{
|
||
if (filename_cmp (objfile_name (so->objfile), so->so_name) == 0
|
||
&& so->objfile->addr_low == so->addr_low)
|
||
break;
|
||
}
|
||
if (so->objfile != NULL)
|
||
break;
|
||
|
||
sap = build_section_addr_info_from_section_table (so->sections,
|
||
so->sections_end);
|
||
so->objfile = symbol_file_add_from_bfd (so->abfd, so->so_name,
|
||
flags, sap, OBJF_SHARED,
|
||
NULL);
|
||
so->objfile->addr_low = so->addr_low;
|
||
free_section_addr_info (sap);
|
||
}
|
||
|
||
if (e.reason < 0)
|
||
exception_fprintf (gdb_stderr, e, _("Error while reading shared"
|
||
" library symbols for %s:\n"),
|
||
so->so_name);
|
||
else
|
||
{
|
||
if (print_symbol_loading_p (from_tty, 0, 1))
|
||
printf_unfiltered (_("Loaded symbols for %s\n"), so->so_name);
|
||
so->symbols_loaded = 1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Return 1 if KNOWN->objfile is used by any other so_list object in the
|
||
SO_LIST_HEAD list. Return 0 otherwise. */
|
||
|
||
static int
|
||
solib_used (const struct so_list *const known)
|
||
{
|
||
const struct so_list *pivot;
|
||
|
||
for (pivot = so_list_head; pivot != NULL; pivot = pivot->next)
|
||
if (pivot != known && pivot->objfile == known->objfile)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
/* Synchronize GDB's shared object list with inferior's.
|
||
|
||
Extract the list of currently loaded shared objects from the
|
||
inferior, and compare it with the list of shared objects currently
|
||
in GDB's so_list_head list. Edit so_list_head to bring it in sync
|
||
with the inferior's new list.
|
||
|
||
If we notice that the inferior has unloaded some shared objects,
|
||
free any symbolic info GDB had read about those shared objects.
|
||
|
||
Don't load symbolic info for any new shared objects; just add them
|
||
to the list, and leave their symbols_loaded flag clear.
|
||
|
||
If FROM_TTY is non-null, feel free to print messages about what
|
||
we're doing.
|
||
|
||
If TARGET is non-null, add the sections of all new shared objects
|
||
to TARGET's section table. Note that this doesn't remove any
|
||
sections for shared objects that have been unloaded, and it
|
||
doesn't check to see if the new shared objects are already present in
|
||
the section table. But we only use this for core files and
|
||
processes we've just attached to, so that's okay. */
|
||
|
||
static void
|
||
update_solib_list (int from_tty, struct target_ops *target)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
struct so_list *inferior = ops->current_sos();
|
||
struct so_list *gdb, **gdb_link;
|
||
|
||
/* We can reach here due to changing solib-search-path or the
|
||
sysroot, before having any inferior. */
|
||
if (target_has_execution && !ptid_equal (inferior_ptid, null_ptid))
|
||
{
|
||
struct inferior *inf = current_inferior ();
|
||
|
||
/* If we are attaching to a running process for which we
|
||
have not opened a symbol file, we may be able to get its
|
||
symbols now! */
|
||
if (inf->attach_flag && symfile_objfile == NULL)
|
||
catch_errors (ops->open_symbol_file_object, &from_tty,
|
||
"Error reading attached process's symbol file.\n",
|
||
RETURN_MASK_ALL);
|
||
}
|
||
|
||
/* GDB and the inferior's dynamic linker each maintain their own
|
||
list of currently loaded shared objects; we want to bring the
|
||
former in sync with the latter. Scan both lists, seeing which
|
||
shared objects appear where. There are three cases:
|
||
|
||
- A shared object appears on both lists. This means that GDB
|
||
knows about it already, and it's still loaded in the inferior.
|
||
Nothing needs to happen.
|
||
|
||
- A shared object appears only on GDB's list. This means that
|
||
the inferior has unloaded it. We should remove the shared
|
||
object from GDB's tables.
|
||
|
||
- A shared object appears only on the inferior's list. This
|
||
means that it's just been loaded. We should add it to GDB's
|
||
tables.
|
||
|
||
So we walk GDB's list, checking each entry to see if it appears
|
||
in the inferior's list too. If it does, no action is needed, and
|
||
we remove it from the inferior's list. If it doesn't, the
|
||
inferior has unloaded it, and we remove it from GDB's list. By
|
||
the time we're done walking GDB's list, the inferior's list
|
||
contains only the new shared objects, which we then add. */
|
||
|
||
gdb = so_list_head;
|
||
gdb_link = &so_list_head;
|
||
while (gdb)
|
||
{
|
||
struct so_list *i = inferior;
|
||
struct so_list **i_link = &inferior;
|
||
|
||
/* Check to see whether the shared object *gdb also appears in
|
||
the inferior's current list. */
|
||
while (i)
|
||
{
|
||
if (ops->same)
|
||
{
|
||
if (ops->same (gdb, i))
|
||
break;
|
||
}
|
||
else
|
||
{
|
||
if (! filename_cmp (gdb->so_original_name, i->so_original_name))
|
||
break;
|
||
}
|
||
|
||
i_link = &i->next;
|
||
i = *i_link;
|
||
}
|
||
|
||
/* If the shared object appears on the inferior's list too, then
|
||
it's still loaded, so we don't need to do anything. Delete
|
||
it from the inferior's list, and leave it on GDB's list. */
|
||
if (i)
|
||
{
|
||
*i_link = i->next;
|
||
free_so (i);
|
||
gdb_link = &gdb->next;
|
||
gdb = *gdb_link;
|
||
}
|
||
|
||
/* If it's not on the inferior's list, remove it from GDB's tables. */
|
||
else
|
||
{
|
||
/* Notify any observer that the shared object has been
|
||
unloaded before we remove it from GDB's tables. */
|
||
observer_notify_solib_unloaded (gdb);
|
||
|
||
VEC_safe_push (char_ptr, current_program_space->deleted_solibs,
|
||
xstrdup (gdb->so_name));
|
||
|
||
*gdb_link = gdb->next;
|
||
|
||
/* Unless the user loaded it explicitly, free SO's objfile. */
|
||
if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED)
|
||
&& !solib_used (gdb))
|
||
free_objfile (gdb->objfile);
|
||
|
||
/* Some targets' section tables might be referring to
|
||
sections from so->abfd; remove them. */
|
||
remove_target_sections (gdb);
|
||
|
||
free_so (gdb);
|
||
gdb = *gdb_link;
|
||
}
|
||
}
|
||
|
||
/* Now the inferior's list contains only shared objects that don't
|
||
appear in GDB's list --- those that are newly loaded. Add them
|
||
to GDB's shared object list. */
|
||
if (inferior)
|
||
{
|
||
int not_found = 0;
|
||
const char *not_found_filename = NULL;
|
||
|
||
struct so_list *i;
|
||
|
||
/* Add the new shared objects to GDB's list. */
|
||
*gdb_link = inferior;
|
||
|
||
/* Fill in the rest of each of the `struct so_list' nodes. */
|
||
for (i = inferior; i; i = i->next)
|
||
{
|
||
volatile struct gdb_exception e;
|
||
|
||
i->pspace = current_program_space;
|
||
VEC_safe_push (so_list_ptr, current_program_space->added_solibs, i);
|
||
|
||
TRY_CATCH (e, RETURN_MASK_ERROR)
|
||
{
|
||
/* Fill in the rest of the `struct so_list' node. */
|
||
if (!solib_map_sections (i))
|
||
{
|
||
not_found++;
|
||
if (not_found_filename == NULL)
|
||
not_found_filename = i->so_original_name;
|
||
}
|
||
}
|
||
|
||
if (e.reason < 0)
|
||
exception_fprintf (gdb_stderr, e,
|
||
_("Error while mapping shared "
|
||
"library sections:\n"));
|
||
|
||
/* Notify any observer that the shared object has been
|
||
loaded now that we've added it to GDB's tables. */
|
||
observer_notify_solib_loaded (i);
|
||
}
|
||
|
||
/* If a library was not found, issue an appropriate warning
|
||
message. We have to use a single call to warning in case the
|
||
front end does something special with warnings, e.g., pop up
|
||
a dialog box. It Would Be Nice if we could get a "warning: "
|
||
prefix on each line in the CLI front end, though - it doesn't
|
||
stand out well. */
|
||
|
||
if (not_found == 1)
|
||
warning (_("Could not load shared library symbols for %s.\n"
|
||
"Do you need \"set solib-search-path\" "
|
||
"or \"set sysroot\"?"),
|
||
not_found_filename);
|
||
else if (not_found > 1)
|
||
warning (_("\
|
||
Could not load shared library symbols for %d libraries, e.g. %s.\n\
|
||
Use the \"info sharedlibrary\" command to see the complete listing.\n\
|
||
Do you need \"set solib-search-path\" or \"set sysroot\"?"),
|
||
not_found, not_found_filename);
|
||
}
|
||
}
|
||
|
||
|
||
/* Return non-zero if NAME is the libpthread shared library.
|
||
|
||
Uses a fairly simplistic heuristic approach where we check
|
||
the file name against "/libpthread". This can lead to false
|
||
positives, but this should be good enough in practice. */
|
||
|
||
int
|
||
libpthread_name_p (const char *name)
|
||
{
|
||
return (strstr (name, "/libpthread") != NULL);
|
||
}
|
||
|
||
/* Return non-zero if SO is the libpthread shared library. */
|
||
|
||
static int
|
||
libpthread_solib_p (struct so_list *so)
|
||
{
|
||
return libpthread_name_p (so->so_name);
|
||
}
|
||
|
||
/* Read in symbolic information for any shared objects whose names
|
||
match PATTERN. (If we've already read a shared object's symbol
|
||
info, leave it alone.) If PATTERN is zero, read them all.
|
||
|
||
If READSYMS is 0, defer reading symbolic information until later
|
||
but still do any needed low level processing.
|
||
|
||
FROM_TTY and TARGET are as described for update_solib_list, above. */
|
||
|
||
void
|
||
solib_add (char *pattern, int from_tty,
|
||
struct target_ops *target, int readsyms)
|
||
{
|
||
struct so_list *gdb;
|
||
|
||
if (print_symbol_loading_p (from_tty, 0, 0))
|
||
{
|
||
if (pattern != NULL)
|
||
{
|
||
printf_unfiltered (_("Loading symbols for shared libraries: %s\n"),
|
||
pattern);
|
||
}
|
||
else
|
||
printf_unfiltered (_("Loading symbols for shared libraries.\n"));
|
||
}
|
||
|
||
current_program_space->solib_add_generation++;
|
||
|
||
if (pattern)
|
||
{
|
||
char *re_err = re_comp (pattern);
|
||
|
||
if (re_err)
|
||
error (_("Invalid regexp: %s"), re_err);
|
||
}
|
||
|
||
update_solib_list (from_tty, target);
|
||
|
||
/* Walk the list of currently loaded shared libraries, and read
|
||
symbols for any that match the pattern --- or any whose symbols
|
||
aren't already loaded, if no pattern was given. */
|
||
{
|
||
int any_matches = 0;
|
||
int loaded_any_symbols = 0;
|
||
const int flags =
|
||
SYMFILE_DEFER_BP_RESET | (from_tty ? SYMFILE_VERBOSE : 0);
|
||
|
||
for (gdb = so_list_head; gdb; gdb = gdb->next)
|
||
if (! pattern || re_exec (gdb->so_name))
|
||
{
|
||
/* Normally, we would read the symbols from that library
|
||
only if READSYMS is set. However, we're making a small
|
||
exception for the pthread library, because we sometimes
|
||
need the library symbols to be loaded in order to provide
|
||
thread support (x86-linux for instance). */
|
||
const int add_this_solib =
|
||
(readsyms || libpthread_solib_p (gdb));
|
||
|
||
any_matches = 1;
|
||
if (add_this_solib)
|
||
{
|
||
if (gdb->symbols_loaded)
|
||
{
|
||
/* If no pattern was given, be quiet for shared
|
||
libraries we have already loaded. */
|
||
if (pattern && (from_tty || info_verbose))
|
||
printf_unfiltered (_("Symbols already loaded for %s\n"),
|
||
gdb->so_name);
|
||
}
|
||
else if (solib_read_symbols (gdb, flags))
|
||
loaded_any_symbols = 1;
|
||
}
|
||
}
|
||
|
||
if (loaded_any_symbols)
|
||
breakpoint_re_set ();
|
||
|
||
if (from_tty && pattern && ! any_matches)
|
||
printf_unfiltered
|
||
("No loaded shared libraries match the pattern `%s'.\n", pattern);
|
||
|
||
if (loaded_any_symbols)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
/* Getting new symbols may change our opinion about what is
|
||
frameless. */
|
||
reinit_frame_cache ();
|
||
|
||
ops->special_symbol_handling ();
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Implement the "info sharedlibrary" command. Walk through the
|
||
shared library list and print information about each attached
|
||
library matching PATTERN. If PATTERN is elided, print them
|
||
all. */
|
||
|
||
static void
|
||
info_sharedlibrary_command (char *pattern, int from_tty)
|
||
{
|
||
struct so_list *so = NULL; /* link map state variable */
|
||
int so_missing_debug_info = 0;
|
||
int addr_width;
|
||
int nr_libs;
|
||
struct cleanup *table_cleanup;
|
||
struct gdbarch *gdbarch = target_gdbarch ();
|
||
struct ui_out *uiout = current_uiout;
|
||
|
||
if (pattern)
|
||
{
|
||
char *re_err = re_comp (pattern);
|
||
|
||
if (re_err)
|
||
error (_("Invalid regexp: %s"), re_err);
|
||
}
|
||
|
||
/* "0x", a little whitespace, and two hex digits per byte of pointers. */
|
||
addr_width = 4 + (gdbarch_ptr_bit (gdbarch) / 4);
|
||
|
||
update_solib_list (from_tty, 0);
|
||
|
||
/* make_cleanup_ui_out_table_begin_end needs to know the number of
|
||
rows, so we need to make two passes over the libs. */
|
||
|
||
for (nr_libs = 0, so = so_list_head; so; so = so->next)
|
||
{
|
||
if (so->so_name[0])
|
||
{
|
||
if (pattern && ! re_exec (so->so_name))
|
||
continue;
|
||
++nr_libs;
|
||
}
|
||
}
|
||
|
||
table_cleanup =
|
||
make_cleanup_ui_out_table_begin_end (uiout, 4, nr_libs,
|
||
"SharedLibraryTable");
|
||
|
||
/* The "- 1" is because ui_out adds one space between columns. */
|
||
ui_out_table_header (uiout, addr_width - 1, ui_left, "from", "From");
|
||
ui_out_table_header (uiout, addr_width - 1, ui_left, "to", "To");
|
||
ui_out_table_header (uiout, 12 - 1, ui_left, "syms-read", "Syms Read");
|
||
ui_out_table_header (uiout, 0, ui_noalign,
|
||
"name", "Shared Object Library");
|
||
|
||
ui_out_table_body (uiout);
|
||
|
||
for (so = so_list_head; so; so = so->next)
|
||
{
|
||
struct cleanup *lib_cleanup;
|
||
|
||
if (! so->so_name[0])
|
||
continue;
|
||
if (pattern && ! re_exec (so->so_name))
|
||
continue;
|
||
|
||
lib_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "lib");
|
||
|
||
if (so->addr_high != 0)
|
||
{
|
||
ui_out_field_core_addr (uiout, "from", gdbarch, so->addr_low);
|
||
ui_out_field_core_addr (uiout, "to", gdbarch, so->addr_high);
|
||
}
|
||
else
|
||
{
|
||
ui_out_field_skip (uiout, "from");
|
||
ui_out_field_skip (uiout, "to");
|
||
}
|
||
|
||
if (! ui_out_is_mi_like_p (interp_ui_out (top_level_interpreter ()))
|
||
&& so->symbols_loaded
|
||
&& !objfile_has_symbols (so->objfile))
|
||
{
|
||
so_missing_debug_info = 1;
|
||
ui_out_field_string (uiout, "syms-read", "Yes (*)");
|
||
}
|
||
else
|
||
ui_out_field_string (uiout, "syms-read",
|
||
so->symbols_loaded ? "Yes" : "No");
|
||
|
||
ui_out_field_string (uiout, "name", so->so_name);
|
||
|
||
ui_out_text (uiout, "\n");
|
||
|
||
do_cleanups (lib_cleanup);
|
||
}
|
||
|
||
do_cleanups (table_cleanup);
|
||
|
||
if (nr_libs == 0)
|
||
{
|
||
if (pattern)
|
||
ui_out_message (uiout, 0,
|
||
_("No shared libraries matched.\n"));
|
||
else
|
||
ui_out_message (uiout, 0,
|
||
_("No shared libraries loaded at this time.\n"));
|
||
}
|
||
else
|
||
{
|
||
if (so_missing_debug_info)
|
||
ui_out_message (uiout, 0,
|
||
_("(*): Shared library is missing "
|
||
"debugging information.\n"));
|
||
}
|
||
}
|
||
|
||
/* Return 1 if ADDRESS lies within SOLIB. */
|
||
|
||
int
|
||
solib_contains_address_p (const struct so_list *const solib,
|
||
CORE_ADDR address)
|
||
{
|
||
struct target_section *p;
|
||
|
||
for (p = solib->sections; p < solib->sections_end; p++)
|
||
if (p->addr <= address && address < p->endaddr)
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* If ADDRESS is in a shared lib in program space PSPACE, return its
|
||
name.
|
||
|
||
Provides a hook for other gdb routines to discover whether or not a
|
||
particular address is within the mapped address space of a shared
|
||
library.
|
||
|
||
For example, this routine is called at one point to disable
|
||
breakpoints which are in shared libraries that are not currently
|
||
mapped in. */
|
||
|
||
char *
|
||
solib_name_from_address (struct program_space *pspace, CORE_ADDR address)
|
||
{
|
||
struct so_list *so = NULL;
|
||
|
||
for (so = pspace->so_list; so; so = so->next)
|
||
if (solib_contains_address_p (so, address))
|
||
return (so->so_name);
|
||
|
||
return (0);
|
||
}
|
||
|
||
/* Return whether the data starting at VADDR, size SIZE, must be kept
|
||
in a core file for shared libraries loaded before "gcore" is used
|
||
to be handled correctly when the core file is loaded. This only
|
||
applies when the section would otherwise not be kept in the core
|
||
file (in particular, for readonly sections). */
|
||
|
||
int
|
||
solib_keep_data_in_core (CORE_ADDR vaddr, unsigned long size)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
if (ops->keep_data_in_core)
|
||
return ops->keep_data_in_core (vaddr, size);
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
/* Called by free_all_symtabs */
|
||
|
||
void
|
||
clear_solib (void)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
/* This function is expected to handle ELF shared libraries. It is
|
||
also used on Solaris, which can run either ELF or a.out binaries
|
||
(for compatibility with SunOS 4), both of which can use shared
|
||
libraries. So we don't know whether we have an ELF executable or
|
||
an a.out executable until the user chooses an executable file.
|
||
|
||
ELF shared libraries don't get mapped into the address space
|
||
until after the program starts, so we'd better not try to insert
|
||
breakpoints in them immediately. We have to wait until the
|
||
dynamic linker has loaded them; we'll hit a bp_shlib_event
|
||
breakpoint (look for calls to create_solib_event_breakpoint) when
|
||
it's ready.
|
||
|
||
SunOS shared libraries seem to be different --- they're present
|
||
as soon as the process begins execution, so there's no need to
|
||
put off inserting breakpoints. There's also nowhere to put a
|
||
bp_shlib_event breakpoint, so if we put it off, we'll never get
|
||
around to it.
|
||
|
||
So: disable breakpoints only if we're using ELF shared libs. */
|
||
if (exec_bfd != NULL
|
||
&& bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour)
|
||
disable_breakpoints_in_shlibs ();
|
||
|
||
while (so_list_head)
|
||
{
|
||
struct so_list *so = so_list_head;
|
||
|
||
so_list_head = so->next;
|
||
observer_notify_solib_unloaded (so);
|
||
remove_target_sections (so);
|
||
free_so (so);
|
||
}
|
||
|
||
ops->clear_solib ();
|
||
}
|
||
|
||
/* Shared library startup support. When GDB starts up the inferior,
|
||
it nurses it along (through the shell) until it is ready to execute
|
||
its first instruction. At this point, this function gets
|
||
called. */
|
||
|
||
void
|
||
solib_create_inferior_hook (int from_tty)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
ops->solib_create_inferior_hook (from_tty);
|
||
}
|
||
|
||
/* Check to see if an address is in the dynamic loader's dynamic
|
||
symbol resolution code. Return 1 if so, 0 otherwise. */
|
||
|
||
int
|
||
in_solib_dynsym_resolve_code (CORE_ADDR pc)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
return ops->in_dynsym_resolve_code (pc);
|
||
}
|
||
|
||
/* Implements the "sharedlibrary" command. */
|
||
|
||
static void
|
||
sharedlibrary_command (char *args, int from_tty)
|
||
{
|
||
dont_repeat ();
|
||
solib_add (args, from_tty, (struct target_ops *) 0, 1);
|
||
}
|
||
|
||
/* Implements the command "nosharedlibrary", which discards symbols
|
||
that have been auto-loaded from shared libraries. Symbols from
|
||
shared libraries that were added by explicit request of the user
|
||
are not discarded. Also called from remote.c. */
|
||
|
||
void
|
||
no_shared_libraries (char *ignored, int from_tty)
|
||
{
|
||
/* The order of the two routines below is important: clear_solib notifies
|
||
the solib_unloaded observers, and some of these observers might need
|
||
access to their associated objfiles. Therefore, we can not purge the
|
||
solibs' objfiles before clear_solib has been called. */
|
||
|
||
clear_solib ();
|
||
objfile_purge_solibs ();
|
||
}
|
||
|
||
/* See solib.h. */
|
||
|
||
void
|
||
update_solib_breakpoints (void)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
if (ops->update_breakpoints != NULL)
|
||
ops->update_breakpoints ();
|
||
}
|
||
|
||
/* See solib.h. */
|
||
|
||
void
|
||
handle_solib_event (void)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
if (ops->handle_event != NULL)
|
||
ops->handle_event ();
|
||
|
||
clear_program_space_solib_cache (current_inferior ()->pspace);
|
||
|
||
/* Check for any newly added shared libraries if we're supposed to
|
||
be adding them automatically. Switch terminal for any messages
|
||
produced by breakpoint_re_set. */
|
||
target_terminal_ours_for_output ();
|
||
solib_add (NULL, 0, ¤t_target, auto_solib_add);
|
||
target_terminal_inferior ();
|
||
}
|
||
|
||
/* Reload shared libraries, but avoid reloading the same symbol file
|
||
we already have loaded. */
|
||
|
||
static void
|
||
reload_shared_libraries_1 (int from_tty)
|
||
{
|
||
struct so_list *so;
|
||
struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
|
||
|
||
if (print_symbol_loading_p (from_tty, 0, 0))
|
||
printf_unfiltered (_("Loading symbols for shared libraries.\n"));
|
||
|
||
for (so = so_list_head; so != NULL; so = so->next)
|
||
{
|
||
char *filename, *found_pathname = NULL;
|
||
bfd *abfd;
|
||
int was_loaded = so->symbols_loaded;
|
||
const int flags =
|
||
SYMFILE_DEFER_BP_RESET | (from_tty ? SYMFILE_VERBOSE : 0);
|
||
|
||
filename = tilde_expand (so->so_original_name);
|
||
make_cleanup (xfree, filename);
|
||
abfd = solib_bfd_open (filename);
|
||
if (abfd != NULL)
|
||
{
|
||
found_pathname = xstrdup (bfd_get_filename (abfd));
|
||
make_cleanup (xfree, found_pathname);
|
||
gdb_bfd_unref (abfd);
|
||
}
|
||
|
||
/* If this shared library is no longer associated with its previous
|
||
symbol file, close that. */
|
||
if ((found_pathname == NULL && was_loaded)
|
||
|| (found_pathname != NULL
|
||
&& filename_cmp (found_pathname, so->so_name) != 0))
|
||
{
|
||
if (so->objfile && ! (so->objfile->flags & OBJF_USERLOADED)
|
||
&& !solib_used (so))
|
||
free_objfile (so->objfile);
|
||
remove_target_sections (so);
|
||
clear_so (so);
|
||
}
|
||
|
||
/* If this shared library is now associated with a new symbol
|
||
file, open it. */
|
||
if (found_pathname != NULL
|
||
&& (!was_loaded
|
||
|| filename_cmp (found_pathname, so->so_name) != 0))
|
||
{
|
||
volatile struct gdb_exception e;
|
||
|
||
TRY_CATCH (e, RETURN_MASK_ERROR)
|
||
solib_map_sections (so);
|
||
|
||
if (e.reason < 0)
|
||
exception_fprintf (gdb_stderr, e,
|
||
_("Error while mapping "
|
||
"shared library sections:\n"));
|
||
else if (auto_solib_add || was_loaded || libpthread_solib_p (so))
|
||
solib_read_symbols (so, flags);
|
||
}
|
||
}
|
||
|
||
do_cleanups (old_chain);
|
||
}
|
||
|
||
static void
|
||
reload_shared_libraries (char *ignored, int from_tty,
|
||
struct cmd_list_element *e)
|
||
{
|
||
const struct target_so_ops *ops;
|
||
|
||
reload_shared_libraries_1 (from_tty);
|
||
|
||
ops = solib_ops (target_gdbarch ());
|
||
|
||
/* Creating inferior hooks here has two purposes. First, if we reload
|
||
shared libraries then the address of solib breakpoint we've computed
|
||
previously might be no longer valid. For example, if we forgot to set
|
||
solib-absolute-prefix and are setting it right now, then the previous
|
||
breakpoint address is plain wrong. Second, installing solib hooks
|
||
also implicitly figures were ld.so is and loads symbols for it.
|
||
Absent this call, if we've just connected to a target and set
|
||
solib-absolute-prefix or solib-search-path, we'll lose all information
|
||
about ld.so. */
|
||
if (target_has_execution)
|
||
{
|
||
/* Reset or free private data structures not associated with
|
||
so_list entries. */
|
||
ops->clear_solib ();
|
||
|
||
/* Remove any previous solib event breakpoint. This is usually
|
||
done in common code, at breakpoint_init_inferior time, but
|
||
we're not really starting up the inferior here. */
|
||
remove_solib_event_breakpoints ();
|
||
|
||
solib_create_inferior_hook (from_tty);
|
||
}
|
||
|
||
/* Sometimes the platform-specific hook loads initial shared
|
||
libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be
|
||
incorrectly 0 but such solib targets should be fixed anyway. If we
|
||
made all the inferior hook methods consistent, this call could be
|
||
removed. Call it only after the solib target has been initialized by
|
||
solib_create_inferior_hook. */
|
||
|
||
solib_add (NULL, 0, NULL, auto_solib_add);
|
||
|
||
breakpoint_re_set ();
|
||
|
||
/* We may have loaded or unloaded debug info for some (or all)
|
||
shared libraries. However, frames may still reference them. For
|
||
example, a frame's unwinder might still point at DWARF FDE
|
||
structures that are now freed. Also, getting new symbols may
|
||
change our opinion about what is frameless. */
|
||
reinit_frame_cache ();
|
||
|
||
ops->special_symbol_handling ();
|
||
}
|
||
|
||
static void
|
||
show_auto_solib_add (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Autoloading of shared library symbols is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
|
||
/* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call
|
||
the library-specific handler if it is installed for the current target. */
|
||
|
||
struct symbol *
|
||
solib_global_lookup (const struct objfile *objfile,
|
||
const char *name,
|
||
const domain_enum domain)
|
||
{
|
||
const struct target_so_ops *ops = solib_ops (target_gdbarch ());
|
||
|
||
if (ops->lookup_lib_global_symbol != NULL)
|
||
return ops->lookup_lib_global_symbol (objfile, name, domain);
|
||
return NULL;
|
||
}
|
||
|
||
/* Lookup the value for a specific symbol from dynamic symbol table. Look
|
||
up symbol from ABFD. MATCH_SYM is a callback function to determine
|
||
whether to pick up a symbol. DATA is the input of this callback
|
||
function. Return NULL if symbol is not found. */
|
||
|
||
CORE_ADDR
|
||
gdb_bfd_lookup_symbol_from_symtab (bfd *abfd,
|
||
int (*match_sym) (asymbol *, void *),
|
||
void *data)
|
||
{
|
||
long storage_needed = bfd_get_symtab_upper_bound (abfd);
|
||
CORE_ADDR symaddr = 0;
|
||
|
||
if (storage_needed > 0)
|
||
{
|
||
unsigned int i;
|
||
|
||
asymbol **symbol_table = (asymbol **) xmalloc (storage_needed);
|
||
struct cleanup *back_to = make_cleanup (xfree, symbol_table);
|
||
unsigned int number_of_symbols =
|
||
bfd_canonicalize_symtab (abfd, symbol_table);
|
||
|
||
for (i = 0; i < number_of_symbols; i++)
|
||
{
|
||
asymbol *sym = *symbol_table++;
|
||
|
||
if (match_sym (sym, data))
|
||
{
|
||
/* BFD symbols are section relative. */
|
||
symaddr = sym->value + sym->section->vma;
|
||
break;
|
||
}
|
||
}
|
||
do_cleanups (back_to);
|
||
}
|
||
|
||
return symaddr;
|
||
}
|
||
|
||
/* Lookup the value for a specific symbol from symbol table. Look up symbol
|
||
from ABFD. MATCH_SYM is a callback function to determine whether to pick
|
||
up a symbol. DATA is the input of this callback function. Return NULL
|
||
if symbol is not found. */
|
||
|
||
static CORE_ADDR
|
||
bfd_lookup_symbol_from_dyn_symtab (bfd *abfd,
|
||
int (*match_sym) (asymbol *, void *),
|
||
void *data)
|
||
{
|
||
long storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd);
|
||
CORE_ADDR symaddr = 0;
|
||
|
||
if (storage_needed > 0)
|
||
{
|
||
unsigned int i;
|
||
asymbol **symbol_table = (asymbol **) xmalloc (storage_needed);
|
||
struct cleanup *back_to = make_cleanup (xfree, symbol_table);
|
||
unsigned int number_of_symbols =
|
||
bfd_canonicalize_dynamic_symtab (abfd, symbol_table);
|
||
|
||
for (i = 0; i < number_of_symbols; i++)
|
||
{
|
||
asymbol *sym = *symbol_table++;
|
||
|
||
if (match_sym (sym, data))
|
||
{
|
||
/* BFD symbols are section relative. */
|
||
symaddr = sym->value + sym->section->vma;
|
||
break;
|
||
}
|
||
}
|
||
do_cleanups (back_to);
|
||
}
|
||
return symaddr;
|
||
}
|
||
|
||
/* Lookup the value for a specific symbol from symbol table and dynamic
|
||
symbol table. Look up symbol from ABFD. MATCH_SYM is a callback
|
||
function to determine whether to pick up a symbol. DATA is the
|
||
input of this callback function. Return NULL if symbol is not
|
||
found. */
|
||
|
||
CORE_ADDR
|
||
gdb_bfd_lookup_symbol (bfd *abfd,
|
||
int (*match_sym) (asymbol *, void *),
|
||
void *data)
|
||
{
|
||
CORE_ADDR symaddr = gdb_bfd_lookup_symbol_from_symtab (abfd, match_sym, data);
|
||
|
||
/* On FreeBSD, the dynamic linker is stripped by default. So we'll
|
||
have to check the dynamic string table too. */
|
||
if (symaddr == 0)
|
||
symaddr = bfd_lookup_symbol_from_dyn_symtab (abfd, match_sym, data);
|
||
|
||
return symaddr;
|
||
}
|
||
|
||
/* SO_LIST_HEAD may contain user-loaded object files that can be removed
|
||
out-of-band by the user. So upon notification of free_objfile remove
|
||
all references to any user-loaded file that is about to be freed. */
|
||
|
||
static void
|
||
remove_user_added_objfile (struct objfile *objfile)
|
||
{
|
||
struct so_list *so;
|
||
|
||
if (objfile != 0 && objfile->flags & OBJF_USERLOADED)
|
||
{
|
||
for (so = so_list_head; so != NULL; so = so->next)
|
||
if (so->objfile == objfile)
|
||
so->objfile = NULL;
|
||
}
|
||
}
|
||
|
||
extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */
|
||
|
||
void
|
||
_initialize_solib (void)
|
||
{
|
||
solib_data = gdbarch_data_register_pre_init (solib_init);
|
||
|
||
observer_attach_free_objfile (remove_user_added_objfile);
|
||
|
||
add_com ("sharedlibrary", class_files, sharedlibrary_command,
|
||
_("Load shared object library symbols for files matching REGEXP."));
|
||
add_info ("sharedlibrary", info_sharedlibrary_command,
|
||
_("Status of loaded shared object libraries."));
|
||
add_com ("nosharedlibrary", class_files, no_shared_libraries,
|
||
_("Unload all shared object library symbols."));
|
||
|
||
add_setshow_boolean_cmd ("auto-solib-add", class_support,
|
||
&auto_solib_add, _("\
|
||
Set autoloading of shared library symbols."), _("\
|
||
Show autoloading of shared library symbols."), _("\
|
||
If \"on\", symbols from all shared object libraries will be loaded\n\
|
||
automatically when the inferior begins execution, when the dynamic linker\n\
|
||
informs gdb that a new library has been loaded, or when attaching to the\n\
|
||
inferior. Otherwise, symbols must be loaded manually, using \
|
||
`sharedlibrary'."),
|
||
NULL,
|
||
show_auto_solib_add,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_filename_cmd ("sysroot", class_support,
|
||
&gdb_sysroot, _("\
|
||
Set an alternate system root."), _("\
|
||
Show the current system root."), _("\
|
||
The system root is used to load absolute shared library symbol files.\n\
|
||
For other (relative) files, you can add directories using\n\
|
||
`set solib-search-path'."),
|
||
reload_shared_libraries,
|
||
NULL,
|
||
&setlist, &showlist);
|
||
|
||
add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0,
|
||
&setlist);
|
||
add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0,
|
||
&showlist);
|
||
|
||
add_setshow_optional_filename_cmd ("solib-search-path", class_support,
|
||
&solib_search_path, _("\
|
||
Set the search path for loading non-absolute shared library symbol files."),
|
||
_("\
|
||
Show the search path for loading non-absolute shared library symbol files."),
|
||
_("\
|
||
This takes precedence over the environment variables \
|
||
PATH and LD_LIBRARY_PATH."),
|
||
reload_shared_libraries,
|
||
show_solib_search_path,
|
||
&setlist, &showlist);
|
||
}
|