| /* Handle shared libraries for GDB, the GNU Debugger. |
| |
| Copyright (C) 1990-2015 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 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| |
| #include <sys/types.h> |
| #include <fcntl.h> |
| #include "symtab.h" |
| #include "bfd.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "gdbcore.h" |
| #include "command.h" |
| #include "target.h" |
| #include "frame.h" |
| #include "gdb_regex.h" |
| #include "inferior.h" |
| #include "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 "remote.h" |
| #include "solib.h" |
| #include "interps.h" |
| #include "filesystem.h" |
| #include "gdb_bfd.h" |
| #include "filestuff.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; |
| |
| ops = OBSTACK_ZALLOC (obstack, struct target_so_ops *); |
| *ops = current_target_so_ops; |
| return 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); |
| |
| return *ops; |
| } |
| |
| /* Set the solib operations for GDBARCH to NEW_OPS. */ |
| |
| 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); |
| |
| *ops = new_ops; |
| } |
| |
| |
| /* external data declarations */ |
| |
| /* 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; |
| |
| /* List of known shared objects */ |
| #define so_list_head current_program_space->so_list |
| |
| /* 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); |
| } |
| |
| /* 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. The returned |
| pathname is malloc'ed and must be freed by the caller. 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 either the sysroot (if set) or |
| the local filesystem. SOLIB_SEARCH_PATH is not used when searching |
| for the main executable. |
| |
| Search algorithm: |
| * If a sysroot is set and path is absolute: |
| * Search for sysroot/path. |
| * else |
| * Look for it literally (unmodified). |
| * 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. |
| * If IS_SOLIB is non-zero: |
| * Look in inferior's $LD_LIBRARY_PATH. |
| * |
| * The last check avoids doing this search when targetting remote |
| * machines since a sysroot will almost always be set. |
| */ |
| |
| static char * |
| solib_find_1 (char *in_pathname, int *fd, int is_solib) |
| { |
| const struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| int found_file = -1; |
| char *temp_pathname = NULL; |
| const char *fskind = effective_target_file_system_kind (); |
| struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
| 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--; |
| |
| if (prefix_len == 0) |
| sysroot = NULL; |
| else if (prefix_len != orig_prefix_len) |
| { |
| sysroot = savestring (sysroot, prefix_len); |
| make_cleanup (xfree, sysroot); |
| } |
| |
| /* 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) |
| { |
| char *p; |
| |
| /* Avoid clobbering our input. */ |
| p = (char *) alloca (strlen (in_pathname) + 1); |
| strcpy (p, in_pathname); |
| in_pathname = p; |
| |
| for (; *p; p++) |
| { |
| 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 = xstrdup (in_pathname); |
| else |
| { |
| int 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 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 = 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)) |
| { |
| if (fd != NULL) |
| *fd = -1; |
| do_cleanups (old_chain); |
| return temp_pathname; |
| } |
| |
| /* Now see if we can open it. */ |
| found_file = gdb_open_cloexec (temp_pathname, O_RDONLY | O_BINARY, 0); |
| if (found_file < 0) |
| xfree (temp_pathname); |
| |
| /* 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. */ |
| |
| if (found_file < 0 |
| && sysroot != NULL |
| && HAS_TARGET_DRIVE_SPEC (fskind, in_pathname)) |
| { |
| int need_dir_separator = !IS_DIR_SEPARATOR (in_pathname[2]); |
| char *drive = savestring (in_pathname, 1); |
| |
| temp_pathname = concat (sysroot, |
| SLASH_STRING, |
| drive, |
| need_dir_separator ? SLASH_STRING : "", |
| in_pathname + 2, (char *) NULL); |
| xfree (drive); |
| |
| found_file = gdb_open_cloexec (temp_pathname, O_RDONLY | O_BINARY, 0); |
| if (found_file < 0) |
| { |
| xfree (temp_pathname); |
| |
| /* 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 = concat (sysroot, |
| need_dir_separator ? SLASH_STRING : "", |
| in_pathname + 2, (char *) NULL); |
| |
| found_file = gdb_open_cloexec (temp_pathname, O_RDONLY | O_BINARY, 0); |
| if (found_file < 0) |
| xfree (temp_pathname); |
| } |
| } |
| |
| do_cleanups (old_chain); |
| |
| /* 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 = 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_TARGET_ABSOLUTE_PATH (fskind, in_pathname)) |
| { |
| /* First, get rid of any drive letters etc. */ |
| while (!IS_TARGET_DIR_SEPARATOR (fskind, *in_pathname)) |
| in_pathname++; |
| |
| /* Next, get rid of all leading dir separators. */ |
| while (IS_TARGET_DIR_SEPARATOR (fskind, *in_pathname)) |
| in_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 (get_in_environ (current_inferior ()->environment, |
| "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 (get_in_environ (current_inferior ()->environment, |
| "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; |
| |
| return temp_pathname; |
| } |
| |
| /* Return the full pathname of the main executable, or NULL if not |
| found. The returned pathname is malloc'ed and must be freed by |
| the caller. If FD is non-NULL, *FD is set to either -1 or an open |
| file handle for the main executable. |
| |
| The search algorithm used is described in solib_find_1's comment |
| above. */ |
| |
| char * |
| exec_file_find (char *in_pathname, int *fd) |
| { |
| char *result = solib_find_1 (in_pathname, fd, 0); |
| |
| if (result == NULL) |
| { |
| const char *fskind = effective_target_file_system_kind (); |
| |
| if (fskind == file_system_kind_dos_based) |
| { |
| char *new_pathname; |
| |
| new_pathname = (char *) alloca (strlen (in_pathname) + 5); |
| strcpy (new_pathname, in_pathname); |
| strcat (new_pathname, ".exe"); |
| |
| result = solib_find_1 (new_pathname, fd, 0); |
| } |
| } |
| |
| return result; |
| } |
| |
| /* Return the full pathname of a shared library file, or NULL if not |
| found. The returned pathname is malloc'ed and must be freed by |
| the caller. If FD is non-NULL, *FD is set to either -1 or an open |
| file handle for the shared library. |
| |
| The search algorithm used is described in solib_find_1's comment |
| above. */ |
| |
| char * |
| solib_find (char *in_pathname, int *fd) |
| { |
| const char *solib_symbols_extension |
| = gdbarch_solib_symbols_extension (target_gdbarch ()); |
| |
| /* If solib_symbols_extension is set, replace the file's |
| extension. */ |
| if (solib_symbols_extension != NULL) |
| { |
| char *p = in_pathname + strlen (in_pathname); |
| |
| while (p > in_pathname && *p != '.') |
| p--; |
| |
| 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; |
| } |
| } |
| |
| return solib_find_1 (in_pathname, fd, 1); |
| } |
| |
| /* 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. |
| |
| PATHNAME must be malloc'ed by the caller. It will be freed by this |
| function. If unsuccessful, the FD will be closed (unless FD was |
| -1). */ |
| |
| bfd * |
| solib_bfd_fopen (char *pathname, int fd) |
| { |
| bfd *abfd = gdb_bfd_open (pathname, gnutarget, fd); |
| |
| if (abfd != NULL && !gdb_bfd_has_target_filename (abfd)) |
| bfd_set_cacheable (abfd, 1); |
| |
| if (!abfd) |
| { |
| make_cleanup (xfree, pathname); |
| error (_("Could not open `%s' as an executable file: %s"), |
| pathname, bfd_errmsg (bfd_get_error ())); |
| } |
| |
| xfree (pathname); |
| |
| return abfd; |
| } |
| |
| /* Find shared library PATHNAME and open a BFD for it. */ |
| |
| bfd * |
| solib_bfd_open (char *pathname) |
| { |
| char *found_pathname; |
| int found_file; |
| bfd *abfd; |
| const struct bfd_arch_info *b; |
| |
| /* Search for shared library file. */ |
| 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. */ |
| abfd = solib_bfd_fopen (found_pathname, found_file); |
| |
| /* Check bfd format. */ |
| if (!bfd_check_format (abfd, bfd_object)) |
| { |
| make_cleanup_bfd_unref (abfd); |
| error (_("`%s': not in executable format: %s"), |
| bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
| } |
| |
| /* Check bfd arch. */ |
| b = gdbarch_bfd_arch_info (target_gdbarch ()); |
| if (!b->compatible (b, bfd_get_arch_info (abfd))) |
| warning (_("`%s': Shared library architecture %s is not compatible " |
| "with target architecture %s."), bfd_get_filename (abfd), |
| bfd_get_arch_info (abfd)->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 ()); |
| 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) |
| { |
| 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 |
| { |
| |
| flags |= current_inferior ()->symfile_flags; |
| |
| TRY |
| { |
| 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); |
| |
| so->symbols_loaded = 1; |
| } |
| CATCH (e, RETURN_MASK_ERROR) |
| { |
| exception_fprintf (gdb_stderr, e, _("Error while reading shared" |
| " library symbols for %s:\n"), |
| so->so_name); |
| } |
| END_CATCH |
| |
| 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) |
| { |
| |
| i->pspace = current_program_space; |
| VEC_safe_push (so_list_ptr, current_program_space->added_solibs, i); |
| |
| TRY |
| { |
| /* 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; |
| } |
| } |
| |
| CATCH (e, RETURN_MASK_ERROR) |
| { |
| exception_fprintf (gdb_stderr, e, |
| _("Error while mapping shared " |
| "library sections:\n")); |
| } |
| END_CATCH |
| |
| /* 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 (const 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, current_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)) |
| { |
| int got_error = 0; |
| |
| TRY |
| { |
| solib_map_sections (so); |
| } |
| |
| CATCH (e, RETURN_MASK_ERROR) |
| { |
| exception_fprintf (gdb_stderr, e, |
| _("Error while mapping " |
| "shared library sections:\n")); |
| got_error = 1; |
| } |
| END_CATCH |
| |
| if (!got_error |
| && (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 (); |
| } |
| |
| /* Wrapper for reload_shared_libraries that replaces "remote:" |
| at the start of gdb_sysroot with "target:". */ |
| |
| static void |
| gdb_sysroot_changed (char *ignored, int from_tty, |
| struct cmd_list_element *e) |
| { |
| const char *old_prefix = "remote:"; |
| const char *new_prefix = TARGET_SYSROOT_PREFIX; |
| |
| if (startswith (gdb_sysroot, old_prefix)) |
| { |
| static int warning_issued = 0; |
| |
| gdb_assert (strlen (old_prefix) == strlen (new_prefix)); |
| memcpy (gdb_sysroot, new_prefix, strlen (new_prefix)); |
| |
| if (!warning_issued) |
| { |
| warning (_("\"%s\" is deprecated, use \"%s\" instead."), |
| old_prefix, new_prefix); |
| warning (_("sysroot set to \"%s\"."), gdb_sysroot); |
| |
| warning_issued = 1; |
| } |
| } |
| |
| reload_shared_libraries (ignored, from_tty, e); |
| } |
| |
| 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 block_symbol |
| solib_global_lookup (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 (struct block_symbol) {NULL, 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)) |
| { |
| 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; |
| |
| memset (&msym, 0, sizeof (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; |
| } |
| } |
| 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_info_alias ("dll", "sharedlibrary", 1); |
| 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_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); |
| } |