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| 1 /* build-id-related functions. |
| 2 |
| 3 Copyright (C) 1991-2013 Free Software Foundation, Inc. |
| 4 |
| 5 This file is part of GDB. |
| 6 |
| 7 This program is free software; you can redistribute it and/or modify |
| 8 it under the terms of the GNU General Public License as published by |
| 9 the Free Software Foundation; either version 3 of the License, or |
| 10 (at your option) any later version. |
| 11 |
| 12 This program is distributed in the hope that it will be useful, |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 GNU General Public License for more details. |
| 16 |
| 17 You should have received a copy of the GNU General Public License |
| 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 |
| 20 #include "defs.h" |
| 21 #include "bfd.h" |
| 22 #include "elf-bfd.h" |
| 23 #include "gdb_bfd.h" |
| 24 #include "build-id.h" |
| 25 #include <string.h> |
| 26 #include "gdb_vecs.h" |
| 27 #include "symfile.h" |
| 28 #include "objfiles.h" |
| 29 #include "filenames.h" |
| 30 |
| 31 /* Locate NT_GNU_BUILD_ID from ABFD and return its content. */ |
| 32 |
| 33 static const struct elf_build_id * |
| 34 build_id_bfd_get (bfd *abfd) |
| 35 { |
| 36 if (!bfd_check_format (abfd, bfd_object) |
| 37 || bfd_get_flavour (abfd) != bfd_target_elf_flavour |
| 38 /* Although this is ELF_specific, it is safe to do in generic |
| 39 code because it does not rely on any ELF-specific symbols at |
| 40 link time, and if the ELF code is not available in BFD, then |
| 41 ABFD will not have the ELF flavour. */ |
| 42 || elf_tdata (abfd)->build_id == NULL) |
| 43 return NULL; |
| 44 |
| 45 return elf_tdata (abfd)->build_id; |
| 46 } |
| 47 |
| 48 /* See build-id.h. */ |
| 49 |
| 50 int |
| 51 build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check) |
| 52 { |
| 53 const struct elf_build_id *found; |
| 54 int retval = 0; |
| 55 |
| 56 found = build_id_bfd_get (abfd); |
| 57 |
| 58 if (found == NULL) |
| 59 warning (_("File \"%s\" has no build-id, file skipped"), |
| 60 bfd_get_filename (abfd)); |
| 61 else if (found->size != check_len |
| 62 || memcmp (found->data, check, found->size) != 0) |
| 63 warning (_("File \"%s\" has a different build-id, file skipped"), |
| 64 bfd_get_filename (abfd)); |
| 65 else |
| 66 retval = 1; |
| 67 |
| 68 return retval; |
| 69 } |
| 70 |
| 71 /* See build-id.h. */ |
| 72 |
| 73 bfd * |
| 74 build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id) |
| 75 { |
| 76 char *link, *debugdir; |
| 77 VEC (char_ptr) *debugdir_vec; |
| 78 struct cleanup *back_to; |
| 79 int ix; |
| 80 bfd *abfd = NULL; |
| 81 |
| 82 /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */ |
| 83 link = alloca (strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1 |
| 84 + 2 * build_id_len + (sizeof ".debug" - 1) + 1); |
| 85 |
| 86 /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will |
| 87 cause "/.build-id/..." lookups. */ |
| 88 |
| 89 debugdir_vec = dirnames_to_char_ptr_vec (debug_file_directory); |
| 90 back_to = make_cleanup_free_char_ptr_vec (debugdir_vec); |
| 91 |
| 92 for (ix = 0; VEC_iterate (char_ptr, debugdir_vec, ix, debugdir); ++ix) |
| 93 { |
| 94 size_t debugdir_len = strlen (debugdir); |
| 95 const gdb_byte *data = build_id; |
| 96 size_t size = build_id_len; |
| 97 char *s; |
| 98 char *filename = NULL; |
| 99 |
| 100 memcpy (link, debugdir, debugdir_len); |
| 101 s = &link[debugdir_len]; |
| 102 s += sprintf (s, "/.build-id/"); |
| 103 if (size > 0) |
| 104 { |
| 105 size--; |
| 106 s += sprintf (s, "%02x", (unsigned) *data++); |
| 107 } |
| 108 if (size > 0) |
| 109 *s++ = '/'; |
| 110 while (size-- > 0) |
| 111 s += sprintf (s, "%02x", (unsigned) *data++); |
| 112 strcpy (s, ".debug"); |
| 113 |
| 114 /* lrealpath() is expensive even for the usually non-existent files. */ |
| 115 if (access (link, F_OK) == 0) |
| 116 filename = lrealpath (link); |
| 117 |
| 118 if (filename == NULL) |
| 119 continue; |
| 120 |
| 121 /* We expect to be silent on the non-existing files. */ |
| 122 abfd = gdb_bfd_open_maybe_remote (filename); |
| 123 if (abfd == NULL) |
| 124 continue; |
| 125 |
| 126 if (build_id_verify (abfd, build_id_len, build_id)) |
| 127 break; |
| 128 |
| 129 gdb_bfd_unref (abfd); |
| 130 abfd = NULL; |
| 131 } |
| 132 |
| 133 do_cleanups (back_to); |
| 134 return abfd; |
| 135 } |
| 136 |
| 137 /* See build-id.h. */ |
| 138 |
| 139 char * |
| 140 find_separate_debug_file_by_buildid (struct objfile *objfile) |
| 141 { |
| 142 const struct elf_build_id *build_id; |
| 143 |
| 144 build_id = build_id_bfd_get (objfile->obfd); |
| 145 if (build_id != NULL) |
| 146 { |
| 147 bfd *abfd; |
| 148 |
| 149 abfd = build_id_to_debug_bfd (build_id->size, build_id->data); |
| 150 /* Prevent looping on a stripped .debug file. */ |
| 151 if (abfd != NULL |
| 152 && filename_cmp (bfd_get_filename (abfd), |
| 153 objfile_name (objfile)) == 0) |
| 154 { |
| 155 warning (_("\"%s\": separate debug info file has no debug info"), |
| 156 bfd_get_filename (abfd)); |
| 157 gdb_bfd_unref (abfd); |
| 158 } |
| 159 else if (abfd != NULL) |
| 160 { |
| 161 char *result = xstrdup (bfd_get_filename (abfd)); |
| 162 |
| 163 gdb_bfd_unref (abfd); |
| 164 return result; |
| 165 } |
| 166 } |
| 167 return NULL; |
| 168 } |
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