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dc294be5 TT |
1 | /* build-id-related functions. |
2 | ||
42a4f53d | 3 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
dc294be5 TT |
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" | |
d55e5aa6 TT |
21 | |
22 | /* Local non-gdb includes. */ | |
dc294be5 | 23 | #include "bfd.h" |
dc294be5 | 24 | #include "build-id.h" |
0747795c | 25 | #include "common/gdb_vecs.h" |
dc294be5 | 26 | #include "filenames.h" |
d55e5aa6 | 27 | #include "gdb_bfd.h" |
2938e6cf | 28 | #include "gdbcore.h" |
d55e5aa6 TT |
29 | #include "objfiles.h" |
30 | #include "symfile.h" | |
dc294be5 | 31 | |
7c50a931 | 32 | /* See build-id.h. */ |
dc294be5 | 33 | |
c74f7d1c | 34 | const struct bfd_build_id * |
dc294be5 TT |
35 | build_id_bfd_get (bfd *abfd) |
36 | { | |
c74f7d1c | 37 | if (!bfd_check_format (abfd, bfd_object)) |
dc294be5 TT |
38 | return NULL; |
39 | ||
c74f7d1c JT |
40 | if (abfd->build_id != NULL) |
41 | return abfd->build_id; | |
42 | ||
43 | /* No build-id */ | |
44 | return NULL; | |
dc294be5 TT |
45 | } |
46 | ||
47 | /* See build-id.h. */ | |
48 | ||
49 | int | |
50 | build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check) | |
51 | { | |
c74f7d1c | 52 | const struct bfd_build_id *found; |
dc294be5 TT |
53 | int retval = 0; |
54 | ||
55 | found = build_id_bfd_get (abfd); | |
56 | ||
57 | if (found == NULL) | |
58 | warning (_("File \"%s\" has no build-id, file skipped"), | |
59 | bfd_get_filename (abfd)); | |
60 | else if (found->size != check_len | |
61 | || memcmp (found->data, check, found->size) != 0) | |
62 | warning (_("File \"%s\" has a different build-id, file skipped"), | |
63 | bfd_get_filename (abfd)); | |
64 | else | |
65 | retval = 1; | |
66 | ||
67 | return retval; | |
68 | } | |
69 | ||
07bc701d SM |
70 | /* Helper for build_id_to_debug_bfd. LINK is a path to a potential |
71 | build-id-based separate debug file, potentially a symlink to the real file. | |
72 | If the file exists and matches BUILD_ID, return a BFD reference to it. */ | |
73 | ||
74 | static gdb_bfd_ref_ptr | |
75 | build_id_to_debug_bfd_1 (const std::string &link, size_t build_id_len, | |
76 | const bfd_byte *build_id) | |
77 | { | |
78 | if (separate_debug_file_debug) | |
79 | { | |
80 | printf_unfiltered (_(" Trying %s..."), link.c_str ()); | |
81 | gdb_flush (gdb_stdout); | |
82 | } | |
83 | ||
84 | /* lrealpath() is expensive even for the usually non-existent files. */ | |
85 | gdb::unique_xmalloc_ptr<char> filename; | |
86 | if (access (link.c_str (), F_OK) == 0) | |
87 | filename.reset (lrealpath (link.c_str ())); | |
88 | ||
89 | if (filename == NULL) | |
90 | { | |
91 | if (separate_debug_file_debug) | |
92 | printf_unfiltered (_(" no, unable to compute real path\n")); | |
93 | ||
94 | return {}; | |
95 | } | |
96 | ||
97 | /* We expect to be silent on the non-existing files. */ | |
98 | gdb_bfd_ref_ptr debug_bfd = gdb_bfd_open (filename.get (), gnutarget, -1); | |
99 | ||
100 | if (debug_bfd == NULL) | |
101 | { | |
102 | if (separate_debug_file_debug) | |
103 | printf_unfiltered (_(" no, unable to open.\n")); | |
104 | ||
105 | return {}; | |
106 | } | |
107 | ||
108 | if (!build_id_verify (debug_bfd.get(), build_id_len, build_id)) | |
109 | { | |
110 | if (separate_debug_file_debug) | |
111 | printf_unfiltered (_(" no, build-id does not match.\n")); | |
112 | ||
113 | return {}; | |
114 | } | |
115 | ||
116 | if (separate_debug_file_debug) | |
117 | printf_unfiltered (_(" yes!\n")); | |
118 | ||
119 | return debug_bfd; | |
120 | } | |
121 | ||
dc294be5 TT |
122 | /* See build-id.h. */ |
123 | ||
192b62ce | 124 | gdb_bfd_ref_ptr |
dc294be5 TT |
125 | build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id) |
126 | { | |
dc294be5 TT |
127 | /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will |
128 | cause "/.build-id/..." lookups. */ | |
129 | ||
e80aaf61 SM |
130 | std::vector<gdb::unique_xmalloc_ptr<char>> debugdir_vec |
131 | = dirnames_to_char_ptr_vec (debug_file_directory); | |
dc294be5 | 132 | |
e80aaf61 | 133 | for (const gdb::unique_xmalloc_ptr<char> &debugdir : debugdir_vec) |
dc294be5 | 134 | { |
dc294be5 TT |
135 | const gdb_byte *data = build_id; |
136 | size_t size = build_id_len; | |
dc294be5 | 137 | |
07bc701d SM |
138 | /* Compute where the file named after the build-id would be. |
139 | ||
140 | If debugdir is "/usr/lib/debug" and the build-id is abcdef, this will | |
141 | give "/usr/lib/debug/.build-id/ab/cdef.debug". */ | |
00b40057 SM |
142 | std::string link = debugdir.get (); |
143 | link += "/.build-id/"; | |
144 | ||
dc294be5 TT |
145 | if (size > 0) |
146 | { | |
147 | size--; | |
00b40057 | 148 | string_appendf (link, "%02x/", (unsigned) *data++); |
dc294be5 | 149 | } |
00b40057 | 150 | |
dc294be5 | 151 | while (size-- > 0) |
00b40057 SM |
152 | string_appendf (link, "%02x", (unsigned) *data++); |
153 | ||
154 | link += ".debug"; | |
dc294be5 | 155 | |
07bc701d SM |
156 | gdb_bfd_ref_ptr debug_bfd |
157 | = build_id_to_debug_bfd_1 (link, build_id_len, build_id); | |
158 | if (debug_bfd != NULL) | |
159 | return debug_bfd; | |
c4dcb155 | 160 | |
07bc701d SM |
161 | /* Try to look under the sysroot as well. If the sysroot is |
162 | "/the/sysroot", it will give | |
163 | "/the/sysroot/usr/lib/debug/.build-id/ab/cdef.debug". | |
dc294be5 | 164 | |
07bc701d SM |
165 | Don't do it if the sysroot is the target system ("target:"). It |
166 | could work in theory, but the lrealpath in build_id_to_debug_bfd_1 | |
167 | only works with local paths. */ | |
168 | if (strcmp (gdb_sysroot, TARGET_SYSROOT_PREFIX) != 0) | |
50794b45 | 169 | { |
07bc701d SM |
170 | link = gdb_sysroot + link; |
171 | debug_bfd = build_id_to_debug_bfd_1 (link, build_id_len, build_id); | |
172 | if (debug_bfd != NULL) | |
173 | return debug_bfd; | |
50794b45 | 174 | } |
dc294be5 TT |
175 | } |
176 | ||
07bc701d | 177 | return {}; |
dc294be5 TT |
178 | } |
179 | ||
180 | /* See build-id.h. */ | |
181 | ||
a8dbfd58 | 182 | std::string |
dc294be5 TT |
183 | find_separate_debug_file_by_buildid (struct objfile *objfile) |
184 | { | |
c74f7d1c | 185 | const struct bfd_build_id *build_id; |
dc294be5 TT |
186 | |
187 | build_id = build_id_bfd_get (objfile->obfd); | |
188 | if (build_id != NULL) | |
189 | { | |
c4dcb155 SM |
190 | if (separate_debug_file_debug) |
191 | printf_unfiltered (_("\nLooking for separate debug info (build-id) for " | |
192 | "%s\n"), objfile_name (objfile)); | |
193 | ||
192b62ce TT |
194 | gdb_bfd_ref_ptr abfd (build_id_to_debug_bfd (build_id->size, |
195 | build_id->data)); | |
dc294be5 TT |
196 | /* Prevent looping on a stripped .debug file. */ |
197 | if (abfd != NULL | |
192b62ce | 198 | && filename_cmp (bfd_get_filename (abfd.get ()), |
dc294be5 | 199 | objfile_name (objfile)) == 0) |
192b62ce TT |
200 | warning (_("\"%s\": separate debug info file has no debug info"), |
201 | bfd_get_filename (abfd.get ())); | |
dc294be5 | 202 | else if (abfd != NULL) |
a8dbfd58 | 203 | return std::string (bfd_get_filename (abfd.get ())); |
dc294be5 | 204 | } |
a8dbfd58 SM |
205 | |
206 | return std::string (); | |
dc294be5 | 207 | } |