/* build-id-related functions. Copyright (C) 1991-2015 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 "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. */ bfd * 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; bfd *abfd = NULL; /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */ link = alloca (strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1 + 2 * build_id_len + (sizeof ".debug" - 1) + 1); /* 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"); /* 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, build_id_len, build_id)) break; gdb_bfd_unref (abfd); abfd = NULL; } 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) { bfd *abfd; 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), objfile_name (objfile)) == 0) { warning (_("\"%s\": separate debug info file has no debug info"), bfd_get_filename (abfd)); gdb_bfd_unref (abfd); } else if (abfd != NULL) { char *result = xstrdup (bfd_get_filename (abfd)); gdb_bfd_unref (abfd); return result; } } return NULL; }