/* Handle shared libraries for GDB, the GNU Debugger.
- Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2005
- Free Software Foundation, Inc.
+ Copyright (C) 1990-2019 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include <sys/types.h>
#include <fcntl.h>
-#include "gdb_string.h"
#include "symtab.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
-#include "exceptions.h"
#include "gdbcore.h"
#include "command.h"
#include "target.h"
#include "frame.h"
#include "gdb_regex.h"
#include "inferior.h"
-#include "environ.h"
+#include "gdbsupport/environ.h"
#include "language.h"
#include "gdbcmd.h"
#include "completer.h"
#include "filenames.h" /* for DOSish file names */
#include "exec.h"
#include "solist.h"
-#include "observer.h"
-#include "readline/readline.h"
+#include "observable.h"
+#include "readline/tilde.h"
+#include "remote.h"
+#include "solib.h"
+#include "interps.h"
+#include "filesystem.h"
+#include "gdb_bfd.h"
+#include "gdbsupport/filestuff.h"
+#include "source.h"
+#include "cli/cli-style.h"
+
+/* Architecture-specific operations. */
+
+/* Per-architecture data key. */
+static struct gdbarch_data *solib_data;
+
+static void *
+solib_init (struct obstack *obstack)
+{
+ struct target_so_ops **ops;
-/* external data declarations */
+ ops = OBSTACK_ZALLOC (obstack, struct target_so_ops *);
+ *ops = current_target_so_ops;
+ return ops;
+}
-/* FIXME: gdbarch needs to control this variable */
-struct target_so_ops *current_target_so_ops;
+static const struct target_so_ops *
+solib_ops (struct gdbarch *gdbarch)
+{
+ const struct target_so_ops **ops
+ = (const struct target_so_ops **) gdbarch_data (gdbarch, solib_data);
-/* local data declarations */
+ return *ops;
+}
-static struct so_list *so_list_head; /* List of known shared objects */
+/* Set the solib operations for GDBARCH to NEW_OPS. */
-static int solib_cleanup_queued = 0; /* make_run_cleanup called */
+void
+set_solib_ops (struct gdbarch *gdbarch, const struct target_so_ops *new_ops)
+{
+ const struct target_so_ops **ops
+ = (const struct target_so_ops **) gdbarch_data (gdbarch, solib_data);
-/* Local function prototypes */
+ *ops = new_ops;
+}
+\f
+
+/* external data declarations */
-static void do_clear_solib (void *);
+/* FIXME: gdbarch needs to control this variable, or else every
+ configuration needs to call set_solib_ops. */
+struct target_so_ops *current_target_so_ops;
-/* If non-zero, this is a prefix that will be added to the front of the name
- shared libraries with an absolute filename for loading. */
-static char *solib_absolute_prefix = NULL;
+/* Local function prototypes */
/* If non-empty, this is a search path for loading non-absolute shared library
symbol files. This takes precedence over the environment variables PATH
and LD_LIBRARY_PATH. */
static char *solib_search_path = NULL;
+static void
+show_solib_search_path (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("The search path for loading non-absolute "
+ "shared library symbol files is %s.\n"),
+ value);
+}
-/*
-
- GLOBAL FUNCTION
-
- solib_open -- Find a shared library file and open it.
-
- SYNOPSIS
-
- int solib_open (char *in_patname, char **found_pathname);
-
- DESCRIPTION
-
- Global variable SOLIB_ABSOLUTE_PREFIX is used as a prefix directory
- to search for shared libraries if they have an absolute path.
+/* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
+#if (HAVE_DOS_BASED_FILE_SYSTEM)
+# define DOS_BASED_FILE_SYSTEM 1
+#else
+# define DOS_BASED_FILE_SYSTEM 0
+#endif
+
+/* Return the full pathname of a binary file (the main executable or a
+ shared library file), or NULL if not found. If FD is non-NULL, *FD
+ is set to either -1 or an open file handle for the binary file.
+
+ Global variable GDB_SYSROOT is used as a prefix directory
+ to search for binary files if they have an absolute path.
+ If GDB_SYSROOT starts with "target:" and target filesystem
+ is the local filesystem then the "target:" prefix will be
+ stripped before the search starts. This ensures that the
+ same search algorithm is used for local files regardless of
+ whether a "target:" prefix was used.
Global variable SOLIB_SEARCH_PATH is used as a prefix directory
(or set of directories, as in LD_LIBRARY_PATH) to search for all
- shared libraries if not found in SOLIB_ABSOLUTE_PREFIX.
+ shared libraries if not found in either the sysroot (if set) or
+ the local filesystem. SOLIB_SEARCH_PATH is not used when searching
+ for the main executable.
Search algorithm:
- * If there is a solib_absolute_prefix and path is absolute:
- * Search for solib_absolute_prefix/path.
+ * If a sysroot is set and path is absolute:
+ * Search for sysroot/path.
* else
* Look for it literally (unmodified).
- * Look in SOLIB_SEARCH_PATH.
- * If available, use target defined search function.
- * If solib_absolute_prefix is NOT set, perform the following two searches:
+ * If IS_SOLIB is non-zero:
+ * Look in SOLIB_SEARCH_PATH.
+ * If available, use target defined search function.
+ * If NO sysroot is set, perform the following two searches:
* Look in inferior's $PATH.
- * Look in inferior's $LD_LIBRARY_PATH.
- *
- * The last check avoids doing this search when targetting remote
- * machines since solib_absolute_prefix will almost always be set.
-
- RETURNS
-
- file handle for opened solib, or -1 for failure. */
+ * If IS_SOLIB is non-zero:
+ * Look in inferior's $LD_LIBRARY_PATH.
+ *
+ * The last check avoids doing this search when targeting remote
+ * machines since a sysroot will almost always be set.
+*/
-int
-solib_open (char *in_pathname, char **found_pathname)
+static gdb::unique_xmalloc_ptr<char>
+solib_find_1 (const char *in_pathname, int *fd, bool is_solib)
{
+ const struct target_so_ops *ops = solib_ops (target_gdbarch ());
int found_file = -1;
- char *temp_pathname = NULL;
- char *p = in_pathname;
-
- while (*p && !IS_DIR_SEPARATOR (*p))
- p++;
+ gdb::unique_xmalloc_ptr<char> temp_pathname;
+ const char *fskind = effective_target_file_system_kind ();
+ const char *sysroot = gdb_sysroot;
+ int prefix_len, orig_prefix_len;
+
+ /* If the absolute prefix starts with "target:" but the filesystem
+ accessed by the target_fileio_* methods is the local filesystem
+ then we strip the "target:" prefix now and work with the local
+ filesystem. This ensures that the same search algorithm is used
+ for all local files regardless of whether a "target:" prefix was
+ used. */
+ if (is_target_filename (sysroot) && target_filesystem_is_local ())
+ sysroot += strlen (TARGET_SYSROOT_PREFIX);
+
+ /* Strip any trailing slashes from the absolute prefix. */
+ prefix_len = orig_prefix_len = strlen (sysroot);
+
+ while (prefix_len > 0 && IS_DIR_SEPARATOR (sysroot[prefix_len - 1]))
+ prefix_len--;
+
+ std::string sysroot_holder;
+ if (prefix_len == 0)
+ sysroot = NULL;
+ else if (prefix_len != orig_prefix_len)
+ {
+ sysroot_holder = std::string (sysroot, prefix_len);
+ sysroot = sysroot_holder.c_str ();
+ }
- if (*p)
+ /* If we're on a non-DOS-based system, backslashes won't be
+ understood as directory separator, so, convert them to forward
+ slashes, iff we're supposed to handle DOS-based file system
+ semantics for target paths. */
+ if (!DOS_BASED_FILE_SYSTEM && fskind == file_system_kind_dos_based)
{
- if (! IS_ABSOLUTE_PATH (in_pathname) || solib_absolute_prefix == NULL)
- temp_pathname = in_pathname;
- else
+ char *p;
+
+ /* Avoid clobbering our input. */
+ p = (char *) alloca (strlen (in_pathname) + 1);
+ strcpy (p, in_pathname);
+ in_pathname = p;
+
+ for (; *p; p++)
{
- int prefix_len = strlen (solib_absolute_prefix);
-
- /* Remove trailing slashes from absolute prefix. */
- while (prefix_len > 0
- && IS_DIR_SEPARATOR (solib_absolute_prefix[prefix_len - 1]))
- prefix_len--;
-
- /* Cat the prefixed pathname together. */
- temp_pathname = alloca (prefix_len + strlen (in_pathname) + 1);
- strncpy (temp_pathname, solib_absolute_prefix, prefix_len);
- temp_pathname[prefix_len] = '\0';
- strcat (temp_pathname, in_pathname);
+ if (*p == '\\')
+ *p = '/';
}
+ }
+
+ /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not
+ IS_ABSOLUTE_PATH. The latter is for host paths only, while
+ IN_PATHNAME is a target path. For example, if we're supposed to
+ be handling DOS-like semantics we want to consider a
+ 'c:/foo/bar.dll' path as an absolute path, even on a Unix box.
+ With such a path, before giving up on the sysroot, we'll try:
+
+ 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll
+ 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll
+ 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll
+ */
+
+ if (!IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname) || sysroot == NULL)
+ temp_pathname.reset (xstrdup (in_pathname));
+ else
+ {
+ bool need_dir_separator;
+
+ /* Concatenate the sysroot and the target reported filename. We
+ may need to glue them with a directory separator. Cases to
+ consider:
+
+ | sysroot | separator | in_pathname |
+ |-----------------+-----------+----------------|
+ | /some/dir | / | c:/foo/bar.dll |
+ | /some/dir | | /foo/bar.dll |
+ | target: | | c:/foo/bar.dll |
+ | target: | | /foo/bar.dll |
+ | target:some/dir | / | c:/foo/bar.dll |
+ | target:some/dir | | /foo/bar.dll |
+
+ IOW, we don't need to add a separator if IN_PATHNAME already
+ has one, or when the sysroot is exactly "target:".
+ There's no need to check for drive spec explicitly, as we only
+ get here if IN_PATHNAME is considered an absolute path. */
+ need_dir_separator = !(IS_DIR_SEPARATOR (in_pathname[0])
+ || strcmp (TARGET_SYSROOT_PREFIX, sysroot) == 0);
+
+ /* Cat the prefixed pathname together. */
+ temp_pathname.reset (concat (sysroot,
+ need_dir_separator ? SLASH_STRING : "",
+ in_pathname, (char *) NULL));
+ }
+
+ /* Handle files to be accessed via the target. */
+ if (is_target_filename (temp_pathname.get ()))
+ {
+ if (fd != NULL)
+ *fd = -1;
+ return temp_pathname;
+ }
+
+ /* Now see if we can open it. */
+ found_file = gdb_open_cloexec (temp_pathname.get (), O_RDONLY | O_BINARY, 0);
+
+ /* If the search in gdb_sysroot failed, and the path name has a
+ drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
+ and retrying in the sysroot:
+ c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */
- /* Now see if we can open it. */
- found_file = open (temp_pathname, O_RDONLY, 0);
+ if (found_file < 0
+ && sysroot != NULL
+ && HAS_TARGET_DRIVE_SPEC (fskind, in_pathname))
+ {
+ bool need_dir_separator = !IS_DIR_SEPARATOR (in_pathname[2]);
+ char drive[2] = { in_pathname[0], '\0' };
+
+ temp_pathname.reset (concat (sysroot,
+ SLASH_STRING,
+ drive,
+ need_dir_separator ? SLASH_STRING : "",
+ in_pathname + 2, (char *) NULL));
+
+ found_file = gdb_open_cloexec (temp_pathname.get (),
+ O_RDONLY | O_BINARY, 0);
+ if (found_file < 0)
+ {
+ /* If the search in gdb_sysroot still failed, try fully
+ stripping the drive spec, and trying once more in the
+ sysroot before giving up.
+
+ c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */
+
+ temp_pathname.reset (concat (sysroot,
+ need_dir_separator ? SLASH_STRING : "",
+ in_pathname + 2, (char *) NULL));
+
+ found_file = gdb_open_cloexec (temp_pathname.get (),
+ O_RDONLY | O_BINARY, 0);
+ }
}
- /* If the search in solib_absolute_prefix failed, and the path name is
+ /* We try to find the library in various ways. After each attempt,
+ either found_file >= 0 and temp_pathname is a malloc'd string, or
+ found_file < 0 and temp_pathname does not point to storage that
+ needs to be freed. */
+
+ if (found_file < 0)
+ temp_pathname.reset (NULL);
+
+ /* If the search in gdb_sysroot failed, and the path name is
absolute at this point, make it relative. (openp will try and open the
file according to its absolute path otherwise, which is not what we want.)
Affects subsequent searches for this solib. */
- if (found_file < 0 && IS_ABSOLUTE_PATH (in_pathname))
+ if (found_file < 0 && IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname))
{
/* First, get rid of any drive letters etc. */
- while (!IS_DIR_SEPARATOR (*in_pathname))
- in_pathname++;
+ while (!IS_TARGET_DIR_SEPARATOR (fskind, *in_pathname))
+ in_pathname++;
/* Next, get rid of all leading dir separators. */
- while (IS_DIR_SEPARATOR (*in_pathname))
- in_pathname++;
+ while (IS_TARGET_DIR_SEPARATOR (fskind, *in_pathname))
+ in_pathname++;
}
-
- /* If not found, search the solib_search_path (if any). */
- if (found_file < 0 && solib_search_path != NULL)
- found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST,
- in_pathname, O_RDONLY, 0, &temp_pathname);
-
- /* If not found, next search the solib_search_path (if any) for the basename
- only (ignoring the path). This is to allow reading solibs from a path
- that differs from the opened path. */
- if (found_file < 0 && solib_search_path != NULL)
- found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST,
- lbasename (in_pathname), O_RDONLY, 0,
- &temp_pathname);
-
- /* If not found, try to use target supplied solib search method */
- if (found_file < 0 && TARGET_SO_FIND_AND_OPEN_SOLIB != NULL)
- found_file = TARGET_SO_FIND_AND_OPEN_SOLIB
- (in_pathname, O_RDONLY, &temp_pathname);
- /* If not found, next search the inferior's $PATH environment variable. */
- if (found_file < 0 && solib_absolute_prefix == NULL)
- found_file = openp (get_in_environ (inferior_environ, "PATH"),
- OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY, 0,
- &temp_pathname);
-
- /* If not found, next search the inferior's $LD_LIBRARY_PATH
- environment variable. */
- if (found_file < 0 && solib_absolute_prefix == NULL)
- found_file = openp (get_in_environ (inferior_environ, "LD_LIBRARY_PATH"),
- OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY, 0,
- &temp_pathname);
+ /* If not found, and we're looking for a solib, search the
+ solib_search_path (if any). */
+ if (is_solib && found_file < 0 && solib_search_path != NULL)
+ found_file = openp (solib_search_path,
+ OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
+ in_pathname, O_RDONLY | O_BINARY, &temp_pathname);
+
+ /* If not found, and we're looking for a solib, next search the
+ solib_search_path (if any) for the basename only (ignoring the
+ path). This is to allow reading solibs from a path that differs
+ from the opened path. */
+ if (is_solib && found_file < 0 && solib_search_path != NULL)
+ found_file = openp (solib_search_path,
+ OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
+ target_lbasename (fskind, in_pathname),
+ O_RDONLY | O_BINARY, &temp_pathname);
+
+ /* If not found, and we're looking for a solib, try to use target
+ supplied solib search method. */
+ if (is_solib && found_file < 0 && ops->find_and_open_solib)
+ found_file = ops->find_and_open_solib (in_pathname, O_RDONLY | O_BINARY,
+ &temp_pathname);
+
+ /* If not found, next search the inferior's $PATH environment variable. */
+ if (found_file < 0 && sysroot == NULL)
+ found_file = openp (current_inferior ()->environment.get ("PATH"),
+ OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, in_pathname,
+ O_RDONLY | O_BINARY, &temp_pathname);
+
+ /* If not found, and we're looking for a solib, next search the
+ inferior's $LD_LIBRARY_PATH environment variable. */
+ if (is_solib && found_file < 0 && sysroot == NULL)
+ found_file = openp (current_inferior ()->environment.get
+ ("LD_LIBRARY_PATH"),
+ OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, in_pathname,
+ O_RDONLY | O_BINARY, &temp_pathname);
+
+ if (fd == NULL)
+ {
+ if (found_file >= 0)
+ close (found_file);
+ }
+ else
+ *fd = found_file;
- /* Done. If not found, tough luck. Return found_file and
- (optionally) found_pathname. */
- if (found_pathname != NULL && temp_pathname != NULL)
- *found_pathname = xstrdup (temp_pathname);
- return found_file;
+ return temp_pathname;
}
+/* Return the full pathname of the main executable, or NULL if not
+ found. If FD is non-NULL, *FD is set to either -1 or an open file
+ handle for the main executable. */
-/*
+gdb::unique_xmalloc_ptr<char>
+exec_file_find (const char *in_pathname, int *fd)
+{
+ gdb::unique_xmalloc_ptr<char> result;
+ const char *fskind = effective_target_file_system_kind ();
- LOCAL FUNCTION
+ if (in_pathname == NULL)
+ return NULL;
- solib_map_sections -- open bfd and build sections for shared lib
+ if (*gdb_sysroot != '\0' && IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname))
+ {
+ result = solib_find_1 (in_pathname, fd, false);
- SYNOPSIS
+ if (result == NULL && fskind == file_system_kind_dos_based)
+ {
+ char *new_pathname;
- static int solib_map_sections (struct so_list *so)
+ new_pathname = (char *) alloca (strlen (in_pathname) + 5);
+ strcpy (new_pathname, in_pathname);
+ strcat (new_pathname, ".exe");
- DESCRIPTION
+ result = solib_find_1 (new_pathname, fd, false);
+ }
+ }
+ else
+ {
+ /* It's possible we don't have a full path, but rather just a
+ filename. Some targets, such as HP-UX, don't provide the
+ full path, sigh.
+
+ Attempt to qualify the filename against the source path.
+ (If that fails, we'll just fall back on the original
+ filename. Not much more we can do...) */
+
+ if (!source_full_path_of (in_pathname, &result))
+ result.reset (xstrdup (in_pathname));
+ if (fd != NULL)
+ *fd = -1;
+ }
- 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, and then
- relocate all the section addresses by the base address at
- which the shared object was mapped.
+ return result;
+}
- FIXMES
+/* Return the full pathname of a shared library file, or NULL if not
+ found. If FD is non-NULL, *FD is set to either -1 or an open file
+ handle for the shared library.
- 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?).
- */
+ The search algorithm used is described in solib_find_1's comment
+ above. */
-static int
-solib_map_sections (void *arg)
+gdb::unique_xmalloc_ptr<char>
+solib_find (const char *in_pathname, int *fd)
{
- struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */
- char *filename;
- char *scratch_pathname;
- int scratch_chan;
- struct section_table *p;
- struct cleanup *old_chain;
- bfd *abfd;
+ const char *solib_symbols_extension
+ = gdbarch_solib_symbols_extension (target_gdbarch ());
- filename = tilde_expand (so->so_name);
+ /* If solib_symbols_extension is set, replace the file's
+ extension. */
+ if (solib_symbols_extension != NULL)
+ {
+ const char *p = in_pathname + strlen (in_pathname);
- old_chain = make_cleanup (xfree, filename);
- scratch_chan = solib_open (filename, &scratch_pathname);
+ while (p > in_pathname && *p != '.')
+ p--;
- if (scratch_chan < 0)
- {
- perror_with_name (filename);
+ if (*p == '.')
+ {
+ char *new_pathname;
+
+ new_pathname
+ = (char *) alloca (p - in_pathname + 1
+ + strlen (solib_symbols_extension) + 1);
+ memcpy (new_pathname, in_pathname, p - in_pathname + 1);
+ strcpy (new_pathname + (p - in_pathname) + 1,
+ solib_symbols_extension);
+
+ in_pathname = new_pathname;
+ }
}
- /* Leave scratch_pathname allocated. abfd->name will point to it. */
- abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
- if (!abfd)
+ return solib_find_1 (in_pathname, fd, true);
+}
+
+/* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
+ it is used as file handle to open the file. Throws an error if the file
+ could not be opened. Handles both local and remote file access.
+
+ If unsuccessful, the FD will be closed (unless FD was -1). */
+
+gdb_bfd_ref_ptr
+solib_bfd_fopen (const char *pathname, int fd)
+{
+ gdb_bfd_ref_ptr abfd (gdb_bfd_open (pathname, gnutarget, fd));
+
+ if (abfd != NULL && !gdb_bfd_has_target_filename (abfd.get ()))
+ bfd_set_cacheable (abfd.get (), 1);
+
+ if (abfd == NULL)
{
- close (scratch_chan);
+ /* Arrange to free PATHNAME when the error is thrown. */
error (_("Could not open `%s' as an executable file: %s"),
- scratch_pathname, bfd_errmsg (bfd_get_error ()));
+ pathname, bfd_errmsg (bfd_get_error ()));
}
- /* Leave bfd open, core_xfer_memory and "info files" need it. */
- so->abfd = abfd;
- bfd_set_cacheable (abfd, 1);
+ return abfd;
+}
+
+/* Find shared library PATHNAME and open a BFD for it. */
- /* copy full path name into so_name, so that later symbol_file_add
- can find it */
- if (strlen (scratch_pathname) >= SO_NAME_MAX_PATH_SIZE)
- error (_("Full path name length of shared library exceeds SO_NAME_MAX_PATH_SIZE in so_list structure."));
- strcpy (so->so_name, scratch_pathname);
+gdb_bfd_ref_ptr
+solib_bfd_open (const char *pathname)
+{
+ int found_file;
+ const struct bfd_arch_info *b;
- if (!bfd_check_format (abfd, bfd_object))
+ /* Search for shared library file. */
+ gdb::unique_xmalloc_ptr<char> found_pathname
+ = solib_find (pathname, &found_file);
+ if (found_pathname == NULL)
{
- error (_("\"%s\": not in executable format: %s."),
- scratch_pathname, bfd_errmsg (bfd_get_error ()));
+ /* 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);
}
- if (build_section_table (abfd, &so->sections, &so->sections_end))
+
+ /* Open bfd for shared library. */
+ gdb_bfd_ref_ptr abfd (solib_bfd_fopen (found_pathname.get (), found_file));
+
+ /* Check bfd format. */
+ if (!bfd_check_format (abfd.get (), bfd_object))
+ error (_("`%s': not in executable format: %s"),
+ bfd_get_filename (abfd.get ()), bfd_errmsg (bfd_get_error ()));
+
+ /* Check bfd arch. */
+ b = gdbarch_bfd_arch_info (target_gdbarch ());
+ if (!b->compatible (b, bfd_get_arch_info (abfd.get ())))
+ warning (_("`%s': Shared library architecture %s is not compatible "
+ "with target architecture %s."), bfd_get_filename (abfd.get ()),
+ bfd_get_arch_info (abfd.get ())->printable_name,
+ b->printable_name);
+
+ 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 ());
+ struct target_section *p;
+
+ gdb::unique_xmalloc_ptr<char> filename (tilde_expand (so->so_name));
+ gdb_bfd_ref_ptr abfd (ops->bfd_open (filename.get ()));
+
+ if (abfd == NULL)
+ return 0;
+
+ /* Leave bfd open, core_xfer_memory and "info files" need it. */
+ so->abfd = abfd.release ();
+
+ /* 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 (so->abfd)) >= SO_NAME_MAX_PATH_SIZE)
+ error (_("Shared library file name is too long."));
+ strcpy (so->so_name, bfd_get_filename (so->abfd));
+
+ if (build_section_table (so->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 ()));
+ bfd_get_filename (so->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. */
- TARGET_SO_RELOCATE_SECTION_ADDRESSES (so, p);
- if (strcmp (p->the_bfd_section->name, ".text") == 0)
+ 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->textsection = p;
+ so->addr_low = p->addr;
+ so->addr_high = p->endaddr;
}
}
- /* Free the file names, close the file now. */
- do_cleanups (old_chain);
+ /* 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);
+ return 1;
}
-/* LOCAL FUNCTION
+/* 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;
- free_so --- free a `struct so_list' object
+ /* Our caller closed the objfile, possibly via objfile_purge_solibs. */
+ so->symbols_loaded = 0;
+ so->objfile = NULL;
- SYNOPSIS
+ so->addr_low = so->addr_high = 0;
- void free_so (struct so_list *so)
+ /* Restore the target-supplied file name. SO_NAME may be the path
+ of the symbol file. */
+ strcpy (so->so_name, so->so_original_name);
- DESCRIPTION
+ /* 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.
+/* 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
void
free_so (struct so_list *so)
{
- char *bfd_filename = 0;
-
- if (so->sections)
- xfree (so->sections);
-
- if (so->abfd)
- {
- bfd_filename = bfd_get_filename (so->abfd);
- if (! bfd_close (so->abfd))
- warning (_("cannot close \"%s\": %s"),
- bfd_filename, bfd_errmsg (bfd_get_error ()));
- }
-
- if (bfd_filename)
- xfree (bfd_filename);
+ const struct target_so_ops *ops = solib_ops (target_gdbarch ());
- TARGET_SO_FREE_SO (so);
+ clear_so (so);
+ ops->free_so (so);
xfree (so);
}
return so_list_head;
}
+/* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS,
+ be chatty about it. Return true if any symbols were actually loaded. */
-/* A small stub to get us past the arg-passing pinhole of catch_errors. */
-
-static int
-symbol_add_stub (void *arg)
+bool
+solib_read_symbols (struct so_list *so, symfile_add_flags flags)
{
- struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
- struct section_addr_info *sap;
-
- /* Have we already loaded this shared object? */
- ALL_OBJFILES (so->objfile)
+ if (so->symbols_loaded)
{
- if (strcmp (so->objfile->name, so->so_name) == 0)
- return 1;
+ /* If needed, we've already warned in our caller. */
}
-
- sap = build_section_addr_info_from_section_table (so->sections,
- so->sections_end);
-
- so->objfile = symbol_file_add (so->so_name, so->from_tty,
- sap, 0, OBJF_SHARED);
- free_section_addr_info (sap);
-
- return (1);
-}
-
-/* Read in symbols for shared object SO. If FROM_TTY is non-zero, be
- chatty about it. Return non-zero if any symbols were actually
- loaded. */
-
-int
-solib_read_symbols (struct so_list *so, int from_tty)
-{
- if (so->symbols_loaded)
+ else if (so->abfd == NULL)
{
- if (from_tty)
- printf_unfiltered ("Symbols already loaded for %s\n", so->so_name);
+ /* We've already warned about this library, when trying to open
+ it. */
}
else
{
- if (catch_errors (symbol_add_stub, so,
- "Error while reading shared library symbols:\n",
- RETURN_MASK_ALL))
+
+ flags |= current_inferior ()->symfile_flags;
+
+ try
{
- if (from_tty)
- printf_unfiltered ("Loaded symbols for %s\n", so->so_name);
+ /* Have we already loaded this shared object? */
+ so->objfile = nullptr;
+ for (objfile *objfile : current_program_space->objfiles ())
+ {
+ if (filename_cmp (objfile_name (objfile), so->so_name) == 0
+ && objfile->addr_low == so->addr_low)
+ {
+ so->objfile = objfile;
+ break;
+ }
+ }
+ if (so->objfile == NULL)
+ {
+ section_addr_info 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;
+ }
+
so->symbols_loaded = 1;
- return 1;
}
+ catch (const gdb_exception_error &e)
+ {
+ exception_fprintf (gdb_stderr, e, _("Error while reading shared"
+ " library symbols for %s:\n"),
+ so->so_name);
+ }
+
+ return true;
}
- return 0;
+ return false;
}
-/* LOCAL FUNCTION
-
- update_solib_list --- synchronize GDB's shared object list with inferior's
-
- SYNOPSIS
-
- void update_solib_list (int from_tty, struct target_ops *TARGET)
+/* Return true if KNOWN->objfile is used by any other so_list object in the
+ SO_LIST_HEAD list. Return false otherwise. */
- 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.
+static bool
+solib_used (const struct so_list *const known)
+{
+ const struct so_list *pivot;
- If FROM_TTY is non-null, feel free to print messages about what
- we're doing.
+ for (pivot = so_list_head; pivot != NULL; pivot = pivot->next)
+ if (pivot != known && pivot->objfile == known->objfile)
+ return true;
+ return false;
+}
- 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. */
+/* See solib.h. */
-static void
-update_solib_list (int from_tty, struct target_ops *target)
+void
+update_solib_list (int from_tty)
{
- struct so_list *inferior = TARGET_SO_CURRENT_SOS ();
+ const struct target_so_ops *ops = solib_ops (target_gdbarch ());
+ struct so_list *inferior = ops->current_sos();
struct so_list *gdb, **gdb_link;
- /* 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 (attach_flag &&
- symfile_objfile == NULL)
- catch_errors (TARGET_SO_OPEN_SYMBOL_FILE_OBJECT, &from_tty,
- "Error reading attached process's symbol file.\n",
- RETURN_MASK_ALL);
-
- /* Since this function might actually add some elements to the
- so_list_head list, arrange for it to be cleaned up when
- appropriate. */
- if (!solib_cleanup_queued)
+ /* We can reach here due to changing solib-search-path or the
+ sysroot, before having any inferior. */
+ if (target_has_execution && inferior_ptid != null_ptid)
{
- make_run_cleanup (do_clear_solib, NULL);
- solib_cleanup_queued = 1;
+ 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)
+ {
+ try
+ {
+ ops->open_symbol_file_object (from_tty);
+ }
+ catch (const gdb_exception &ex)
+ {
+ exception_fprintf (gdb_stderr, ex,
+ "Error reading attached "
+ "process's symbol file.\n");
+ }
+ }
}
/* GDB and the inferior's dynamic linker each maintain their own
the inferior's current list. */
while (i)
{
- if (! strcmp (gdb->so_original_name, i->so_original_name))
- break;
+ 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;
{
/* Notify any observer that the shared object has been
unloaded before we remove it from GDB's tables. */
- observer_notify_solib_unloaded (gdb);
+ gdb::observers::solib_unloaded.notify (gdb);
+
+ current_program_space->deleted_solibs.push_back (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))
- free_objfile (gdb->objfile);
+ if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED)
+ && !solib_used (gdb))
+ gdb->objfile->unlink ();
/* Some targets' section tables might be referring to
sections from so->abfd; remove them. */
- remove_target_sections (gdb->abfd);
+ remove_target_sections (gdb);
free_so (gdb);
gdb = *gdb_link;
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. */
/* Fill in the rest of each of the `struct so_list' nodes. */
for (i = inferior; i; i = i->next)
{
- i->from_tty = from_tty;
-
- /* Fill in the rest of the `struct so_list' node. */
- catch_errors (solib_map_sections, i,
- "Error while mapping shared library sections:\n",
- RETURN_MASK_ALL);
-
- /* If requested, add the shared object's sections to the TARGET's
- section table. 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. */
- if (target)
+
+ i->pspace = current_program_space;
+ current_program_space->added_solibs.push_back (i);
+
+ try
{
- int count = (i->sections_end - i->sections);
- if (count > 0)
+ /* Fill in the rest of the `struct so_list' node. */
+ if (!solib_map_sections (i))
{
- int space = target_resize_to_sections (target, count);
- memcpy (target->to_sections + space,
- i->sections,
- count * sizeof (i->sections[0]));
+ not_found++;
+ if (not_found_filename == NULL)
+ not_found_filename = i->so_original_name;
}
}
+ catch (const gdb_exception_error &e)
+ {
+ 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);
+ loaded now that we've added it to GDB's tables. */
+ gdb::observers::solib_loaded.notify (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);
}
}
-/* GLOBAL FUNCTION
+/* Return non-zero if NAME is the libpthread shared library.
- solib_add -- read in symbol info for newly added shared libraries
+ 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. */
- SYNOPSIS
+bool
+libpthread_name_p (const char *name)
+{
+ return (strstr (name, "/libpthread") != NULL);
+}
- void solib_add (char *pattern, int from_tty, struct target_ops
- *TARGET, int readsyms)
+/* Return non-zero if SO is the libpthread shared library. */
- DESCRIPTION
+static bool
+libpthread_solib_p (struct so_list *so)
+{
+ return libpthread_name_p (so->so_name);
+}
- Read in symbolic information for any shared objects whose names
+/* 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. */
+ FROM_TTY is described for update_solib_list, above. */
void
-solib_add (char *pattern, int from_tty, struct target_ops *target, int readsyms)
+solib_add (const char *pattern, int from_tty, 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);
error (_("Invalid regexp: %s"), re_err);
}
- update_solib_list (from_tty, target);
+ update_solib_list (from_tty);
/* 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;
+ bool any_matches = false;
+ bool loaded_any_symbols = false;
+ symfile_add_flags add_flags = SYMFILE_DEFER_BP_RESET;
+
+ if (from_tty)
+ add_flags |= SYMFILE_VERBOSE;
for (gdb = so_list_head; gdb; gdb = gdb->next)
if (! pattern || re_exec (gdb->so_name))
{
- any_matches = 1;
- if (readsyms && solib_read_symbols (gdb, from_tty))
- loaded_any_symbols = 1;
+ /* 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 = true;
+ 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, add_flags))
+ loaded_any_symbols = true;
+ }
}
+ 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);
/* Getting new symbols may change our opinion about what is
frameless. */
reinit_frame_cache ();
-
- TARGET_SO_SPECIAL_SYMBOL_HANDLING ();
}
}
}
-
-/*
-
- LOCAL FUNCTION
-
- info_sharedlibrary_command -- code for "info sharedlibrary"
-
- SYNOPSIS
-
- static void info_sharedlibrary_command ()
-
- DESCRIPTION
-
- Walk through the shared library list and print information
- about each attached library.
- */
+/* 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 *ignore, int from_tty)
+info_sharedlibrary_command (const char *pattern, int from_tty)
{
struct so_list *so = NULL; /* link map state variable */
- int header_done = 0;
+ bool so_missing_debug_info = false;
int addr_width;
+ int nr_libs;
+ struct gdbarch *gdbarch = target_gdbarch ();
+ struct ui_out *uiout = current_uiout;
- if (TARGET_PTR_BIT == 32)
- addr_width = 8 + 4;
- else if (TARGET_PTR_BIT == 64)
- addr_width = 16 + 4;
- else
+ if (pattern)
{
- internal_error (__FILE__, __LINE__,
- "TARGET_PTR_BIT returned unknown size %d",
- TARGET_PTR_BIT);
+ char *re_err = re_comp (pattern);
+
+ if (re_err)
+ error (_("Invalid regexp: %s"), re_err);
}
- update_solib_list (from_tty, 0);
+ /* "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);
- for (so = so_list_head; so; so = so->next)
+ /* ui_out_emit_table table_emitter 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 (!header_done)
- {
- printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From",
- addr_width, "To", "Syms Read",
- "Shared Object Library");
- header_done++;
- }
-
- printf_unfiltered ("%-*s", addr_width,
- so->textsection != NULL
- ? hex_string_custom (
- (LONGEST) so->textsection->addr,
- addr_width - 4)
- : "");
- printf_unfiltered ("%-*s", addr_width,
- so->textsection != NULL
- ? hex_string_custom (
- (LONGEST) so->textsection->endaddr,
- addr_width - 4)
- : "");
- printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No");
- printf_unfiltered ("%s\n", so->so_name);
+ if (pattern && ! re_exec (so->so_name))
+ continue;
+ ++nr_libs;
}
}
- if (so_list_head == NULL)
+
+ {
+ ui_out_emit_table table_emitter (uiout, 4, nr_libs, "SharedLibraryTable");
+
+ /* The "- 1" is because ui_out adds one space between columns. */
+ uiout->table_header (addr_width - 1, ui_left, "from", "From");
+ uiout->table_header (addr_width - 1, ui_left, "to", "To");
+ uiout->table_header (12 - 1, ui_left, "syms-read", "Syms Read");
+ uiout->table_header (0, ui_noalign, "name", "Shared Object Library");
+
+ uiout->table_body ();
+
+ ALL_SO_LIBS (so)
+ {
+ if (! so->so_name[0])
+ continue;
+ if (pattern && ! re_exec (so->so_name))
+ continue;
+
+ ui_out_emit_tuple tuple_emitter (uiout, "lib");
+
+ if (so->addr_high != 0)
+ {
+ uiout->field_core_addr ("from", gdbarch, so->addr_low);
+ uiout->field_core_addr ("to", gdbarch, so->addr_high);
+ }
+ else
+ {
+ uiout->field_skip ("from");
+ uiout->field_skip ("to");
+ }
+
+ if (! top_level_interpreter ()->interp_ui_out ()->is_mi_like_p ()
+ && so->symbols_loaded
+ && !objfile_has_symbols (so->objfile))
+ {
+ so_missing_debug_info = true;
+ uiout->field_string ("syms-read", "Yes (*)");
+ }
+ else
+ uiout->field_string ("syms-read", so->symbols_loaded ? "Yes" : "No");
+
+ uiout->field_string ("name", so->so_name, file_name_style.style ());
+
+ uiout->text ("\n");
+ }
+ }
+
+ if (nr_libs == 0)
+ {
+ if (pattern)
+ uiout->message (_("No shared libraries matched.\n"));
+ else
+ uiout->message (_("No shared libraries loaded at this time.\n"));
+ }
+ else
{
- printf_unfiltered ("No shared libraries loaded at this time.\n");
+ if (so_missing_debug_info)
+ uiout->message (_("(*): Shared library is missing "
+ "debugging information.\n"));
}
}
-/*
+/* See solib.h. */
- GLOBAL FUNCTION
-
- solib_address -- check to see if an address is in a shared lib
+bool
+solib_contains_address_p (const struct so_list *const solib,
+ CORE_ADDR address)
+{
+ struct target_section *p;
- SYNOPSIS
+ for (p = solib->sections; p < solib->sections_end; p++)
+ if (p->addr <= address && address < p->endaddr)
+ return true;
- char * solib_address (CORE_ADDR address)
+ return false;
+}
- DESCRIPTION
+/* 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.
+ 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.
- */
+ mapped in. */
char *
-solib_address (CORE_ADDR address)
+solib_name_from_address (struct program_space *pspace, CORE_ADDR address)
{
- struct so_list *so = 0; /* link map state variable */
-
- for (so = so_list_head; so; so = so->next)
- {
- struct section_table *p;
+ struct so_list *so = NULL;
- for (p = so->sections; p < so->sections_end; p++)
- {
- if (p->addr <= address && address < p->endaddr)
- return (so->so_name);
- }
- }
+ for (so = pspace->so_list; so; so = so->next)
+ if (solib_contains_address_p (so, address))
+ return (so->so_name);
return (0);
}
+/* See solib.h. */
+
+bool
+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) != 0;
+ else
+ return false;
+}
+
/* Called by free_all_symtabs */
void
clear_solib (void)
{
- /* 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 (1);
+ const struct target_so_ops *ops = solib_ops (target_gdbarch ());
+
+ disable_breakpoints_in_shlibs ();
while (so_list_head)
{
struct so_list *so = so_list_head;
+
so_list_head = so->next;
- if (so->abfd)
- remove_target_sections (so->abfd);
+ gdb::observers::solib_unloaded.notify (so);
+ remove_target_sections (so);
free_so (so);
}
- TARGET_SO_CLEAR_SOLIB ();
+ 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);
+}
+
+/* See solib.h. */
+
+bool
+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) != 0;
+}
+
+/* Implements the "sharedlibrary" command. */
+
static void
-do_clear_solib (void *dummy)
+sharedlibrary_command (const char *args, int from_tty)
{
- solib_cleanup_queued = 0;
- clear_solib ();
+ dont_repeat ();
+ solib_add (args, from_tty, 1);
}
-/* GLOBAL FUNCTION
+/* 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. */
- solib_create_inferior_hook -- shared library startup support
+void
+no_shared_libraries (const 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. */
- SYNOPSIS
+ clear_solib ();
+ objfile_purge_solibs ();
+}
+
+/* See solib.h. */
- void solib_create_inferior_hook ()
+void
+update_solib_breakpoints (void)
+{
+ const struct target_so_ops *ops = solib_ops (target_gdbarch ());
- DESCRIPTION
+ if (ops->update_breakpoints != NULL)
+ ops->update_breakpoints ();
+}
- When gdb starts up the inferior, it nurses it along (through the
- shell) until it is ready to execute it's first instruction. At this
- point, this function gets called via expansion of the macro
- SOLIB_CREATE_INFERIOR_HOOK. */
+/* See solib.h. */
void
-solib_create_inferior_hook (void)
+handle_solib_event (void)
{
- TARGET_SO_SOLIB_CREATE_INFERIOR_HOOK ();
+ 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, auto_solib_add);
+ target_terminal::inferior ();
}
-/* GLOBAL FUNCTION
+/* 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;
- in_solib_dynsym_resolve_code -- check to see if an address is in
- dynamic loader's dynamic symbol
- resolution code
+ if (print_symbol_loading_p (from_tty, 0, 0))
+ printf_unfiltered (_("Loading symbols for shared libraries.\n"));
- SYNOPSIS
+ for (so = so_list_head; so != NULL; so = so->next)
+ {
+ const char *found_pathname = NULL;
+ bool was_loaded = so->symbols_loaded != 0;
+ symfile_add_flags add_flags = SYMFILE_DEFER_BP_RESET;
- int in_solib_dynsym_resolve_code (CORE_ADDR pc)
+ if (from_tty)
+ add_flags |= SYMFILE_VERBOSE;
+
+ gdb::unique_xmalloc_ptr<char> filename
+ (tilde_expand (so->so_original_name));
+ gdb_bfd_ref_ptr abfd (solib_bfd_open (filename.get ()));
+ if (abfd != NULL)
+ found_pathname = bfd_get_filename (abfd.get ());
+
+ /* 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))
+ so->objfile->unlink ();
+ remove_target_sections (so);
+ clear_so (so);
+ }
- DESCRIPTION
+ /* 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))
+ {
+ bool got_error = false;
- Determine if PC is in the dynamic linker's symbol resolution
- code. Return 1 if so, 0 otherwise.
-*/
+ try
+ {
+ solib_map_sections (so);
+ }
-int
-in_solib_dynsym_resolve_code (CORE_ADDR pc)
+ catch (const gdb_exception_error &e)
+ {
+ exception_fprintf (gdb_stderr, e,
+ _("Error while mapping "
+ "shared library sections:\n"));
+ got_error = true;
+ }
+
+ if (!got_error
+ && (auto_solib_add || was_loaded || libpthread_solib_p (so)))
+ solib_read_symbols (so, add_flags);
+ }
+ }
+}
+
+static void
+reload_shared_libraries (const char *ignored, int from_tty,
+ struct cmd_list_element *e)
{
- return TARGET_SO_IN_DYNSYM_RESOLVE_CODE (pc);
+ 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, 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 ();
}
-/*
+/* Wrapper for reload_shared_libraries that replaces "remote:"
+ at the start of gdb_sysroot with "target:". */
- LOCAL FUNCTION
+static void
+gdb_sysroot_changed (const char *ignored, int from_tty,
+ struct cmd_list_element *e)
+{
+ const char *old_prefix = "remote:";
+ const char *new_prefix = TARGET_SYSROOT_PREFIX;
- sharedlibrary_command -- handle command to explicitly add library
+ if (startswith (gdb_sysroot, old_prefix))
+ {
+ static bool warning_issued = false;
- SYNOPSIS
+ gdb_assert (strlen (old_prefix) == strlen (new_prefix));
+ memcpy (gdb_sysroot, new_prefix, strlen (new_prefix));
- static void sharedlibrary_command (char *args, int from_tty)
+ if (!warning_issued)
+ {
+ warning (_("\"%s\" is deprecated, use \"%s\" instead."),
+ old_prefix, new_prefix);
+ warning (_("sysroot set to \"%s\"."), gdb_sysroot);
- DESCRIPTION
+ warning_issued = true;
+ }
+ }
- */
+ reload_shared_libraries (ignored, from_tty, e);
+}
static void
-sharedlibrary_command (char *args, int from_tty)
+show_auto_solib_add (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
{
- dont_repeat ();
- solib_add (args, from_tty, (struct target_ops *) 0, 1);
+ fprintf_filtered (file, _("Autoloading of shared library symbols is %s.\n"),
+ value);
}
-/* LOCAL FUNCTION
- no_shared_libraries -- handle command to explicitly discard symbols
- from shared libraries.
+/* 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. */
- DESCRIPTION
+CORE_ADDR
+gdb_bfd_lookup_symbol_from_symtab (bfd *abfd,
+ int (*match_sym) (const asymbol *,
+ const void *),
+ const void *data)
+{
+ long storage_needed = bfd_get_symtab_upper_bound (abfd);
+ CORE_ADDR symaddr = 0;
- 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. */
+ if (storage_needed > 0)
+ {
+ unsigned int i;
-void
-no_shared_libraries (char *ignored, int from_tty)
+ gdb::def_vector<asymbol *> storage (storage_needed / sizeof (asymbol *));
+ asymbol **symbol_table = storage.data ();
+ 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))
+ {
+ struct gdbarch *gdbarch = target_gdbarch ();
+ symaddr = sym->value;
+
+ /* Some ELF targets fiddle with addresses of symbols they
+ consider special. They use minimal symbols to do that
+ and this is needed for correct breakpoint placement,
+ but we do not have full data here to build a complete
+ minimal symbol, so just set the address and let the
+ targets cope with that. */
+ if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
+ && gdbarch_elf_make_msymbol_special_p (gdbarch))
+ {
+ struct minimal_symbol msym {};
+
+ SET_MSYMBOL_VALUE_ADDRESS (&msym, symaddr);
+ gdbarch_elf_make_msymbol_special (gdbarch, sym, &msym);
+ symaddr = MSYMBOL_VALUE_RAW_ADDRESS (&msym);
+ }
+
+ /* BFD symbols are section relative. */
+ symaddr += sym->section->vma;
+ break;
+ }
+ }
+ }
+
+ 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) (const asymbol *,
+ const void *),
+ const void *data)
{
- objfile_purge_solibs ();
- do_clear_solib (NULL);
+ long storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd);
+ CORE_ADDR symaddr = 0;
+
+ if (storage_needed > 0)
+ {
+ unsigned int i;
+ gdb::def_vector<asymbol *> storage (storage_needed / sizeof (asymbol *));
+ asymbol **symbol_table = storage.data ();
+ 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;
+ }
+ }
+ }
+ return symaddr;
}
-static void
-reload_shared_libraries (char *ignored, int from_tty)
+/* 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) (const asymbol *, const void *),
+ const void *data)
{
- no_shared_libraries (NULL, from_tty);
- solib_add (NULL, from_tty, NULL, auto_solib_add);
+ 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;
}
-extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */
+/* 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;
+ }
+}
void
_initialize_solib (void)
{
- struct cmd_list_element *c;
+ solib_data = gdbarch_data_register_pre_init (solib_init);
+
+ gdb::observers::free_objfile.attach (remove_user_added_objfile);
add_com ("sharedlibrary", class_files, sharedlibrary_command,
- "Load shared object library symbols for files matching REGEXP.");
+ _("Load shared object library symbols for files matching REGEXP."));
add_info ("sharedlibrary", info_sharedlibrary_command,
- "Status of loaded shared object libraries.");
+ _("Status of loaded shared object libraries."));
+ add_info_alias ("dll", "sharedlibrary", 1);
add_com ("nosharedlibrary", class_files, no_shared_libraries,
- "Unload all shared object library symbols.");
+ _("Unload all shared object library symbols."));
- deprecated_add_show_from_set
- (add_set_cmd ("auto-solib-add", class_support, var_boolean,
- (char *) &auto_solib_add,
- "Set autoloading of shared library symbols.\n\
+ 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'.",
- &setlist),
- &showlist);
-
- c = add_set_cmd ("solib-absolute-prefix", class_support, var_filename,
- (char *) &solib_absolute_prefix,
- "Set prefix for loading absolute shared library symbol files.\n\
-For other (relative) files, you can add values using `set solib-search-path'.",
- &setlist);
- deprecated_add_show_from_set (c, &showlist);
- set_cmd_cfunc (c, reload_shared_libraries);
- set_cmd_completer (c, filename_completer);
-
- /* Set the default value of "solib-absolute-prefix" from the sysroot, if
- one is set. */
- solib_absolute_prefix = xstrdup (gdb_sysroot);
-
- c = add_set_cmd ("solib-search-path", class_support, var_string,
- (char *) &solib_search_path,
- "Set the search path for loading non-absolute shared library symbol files.\n\
-This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.",
- &setlist);
- deprecated_add_show_from_set (c, &showlist);
- set_cmd_cfunc (c, reload_shared_libraries);
- set_cmd_completer (c, filename_completer);
+inferior. Otherwise, symbols must be loaded manually, using \
+`sharedlibrary'."),
+ NULL,
+ show_auto_solib_add,
+ &setlist, &showlist);
+
+ add_setshow_optional_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'."),
+ gdb_sysroot_changed,
+ 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);
}
projects / deliverable / binutils-gdb.git / blobdiff