| /* build-id-related functions. |
| |
| Copyright (C) 1991-2017 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 "bfd.h" |
| #include "gdb_bfd.h" |
| #include "build-id.h" |
| #include "gdb_vecs.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "filenames.h" |
| #include "gdbcore.h" |
| |
| /* See build-id.h. */ |
| |
| const struct bfd_build_id * |
| build_id_bfd_get (bfd *abfd) |
| { |
| if (!bfd_check_format (abfd, bfd_object)) |
| return NULL; |
| |
| if (abfd->build_id != NULL) |
| return abfd->build_id; |
| |
| /* No build-id */ |
| return NULL; |
| } |
| |
| /* See build-id.h. */ |
| |
| int |
| build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check) |
| { |
| const struct bfd_build_id *found; |
| int retval = 0; |
| |
| found = build_id_bfd_get (abfd); |
| |
| if (found == NULL) |
| warning (_("File \"%s\" has no build-id, file skipped"), |
| bfd_get_filename (abfd)); |
| else if (found->size != check_len |
| || memcmp (found->data, check, found->size) != 0) |
| warning (_("File \"%s\" has a different build-id, file skipped"), |
| bfd_get_filename (abfd)); |
| else |
| retval = 1; |
| |
| return retval; |
| } |
| |
| /* See build-id.h. */ |
| |
| gdb_bfd_ref_ptr |
| build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id) |
| { |
| char *link, *debugdir; |
| VEC (char_ptr) *debugdir_vec; |
| struct cleanup *back_to; |
| int ix; |
| gdb_bfd_ref_ptr abfd; |
| int alloc_len; |
| |
| /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */ |
| alloc_len = (strlen (debug_file_directory) |
| + (sizeof "/.build-id/" - 1) + 1 |
| + 2 * build_id_len + (sizeof ".debug" - 1) + 1); |
| link = (char *) alloca (alloc_len); |
| |
| /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will |
| cause "/.build-id/..." lookups. */ |
| |
| debugdir_vec = dirnames_to_char_ptr_vec (debug_file_directory); |
| back_to = make_cleanup_free_char_ptr_vec (debugdir_vec); |
| |
| for (ix = 0; VEC_iterate (char_ptr, debugdir_vec, ix, debugdir); ++ix) |
| { |
| size_t debugdir_len = strlen (debugdir); |
| const gdb_byte *data = build_id; |
| size_t size = build_id_len; |
| char *s; |
| char *filename = NULL; |
| struct cleanup *inner; |
| |
| memcpy (link, debugdir, debugdir_len); |
| s = &link[debugdir_len]; |
| s += sprintf (s, "/.build-id/"); |
| if (size > 0) |
| { |
| size--; |
| s += sprintf (s, "%02x", (unsigned) *data++); |
| } |
| if (size > 0) |
| *s++ = '/'; |
| while (size-- > 0) |
| s += sprintf (s, "%02x", (unsigned) *data++); |
| strcpy (s, ".debug"); |
| |
| if (separate_debug_file_debug) |
| printf_unfiltered (_(" Trying %s\n"), link); |
| |
| /* lrealpath() is expensive even for the usually non-existent files. */ |
| if (access (link, F_OK) == 0) |
| filename = lrealpath (link); |
| |
| if (filename == NULL) |
| continue; |
| |
| /* We expect to be silent on the non-existing files. */ |
| inner = make_cleanup (xfree, filename); |
| abfd = gdb_bfd_open (filename, gnutarget, -1); |
| do_cleanups (inner); |
| |
| if (abfd == NULL) |
| continue; |
| |
| if (build_id_verify (abfd.get(), build_id_len, build_id)) |
| break; |
| |
| abfd.release (); |
| } |
| |
| do_cleanups (back_to); |
| return abfd; |
| } |
| |
| /* See build-id.h. */ |
| |
| char * |
| find_separate_debug_file_by_buildid (struct objfile *objfile) |
| { |
| const struct bfd_build_id *build_id; |
| |
| build_id = build_id_bfd_get (objfile->obfd); |
| if (build_id != NULL) |
| { |
| if (separate_debug_file_debug) |
| printf_unfiltered (_("\nLooking for separate debug info (build-id) for " |
| "%s\n"), objfile_name (objfile)); |
| |
| gdb_bfd_ref_ptr abfd (build_id_to_debug_bfd (build_id->size, |
| build_id->data)); |
| /* Prevent looping on a stripped .debug file. */ |
| if (abfd != NULL |
| && filename_cmp (bfd_get_filename (abfd.get ()), |
| objfile_name (objfile)) == 0) |
| warning (_("\"%s\": separate debug info file has no debug info"), |
| bfd_get_filename (abfd.get ())); |
| else if (abfd != NULL) |
| return xstrdup (bfd_get_filename (abfd.get ())); |
| } |
| return NULL; |
| } |