Commit | Line | Data |
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dc294be5 TT |
1 | /* build-id-related functions. |
2 | ||
e2882c85 | 3 | Copyright (C) 1991-2018 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" | |
21 | #include "bfd.h" | |
dc294be5 TT |
22 | #include "gdb_bfd.h" |
23 | #include "build-id.h" | |
dc294be5 TT |
24 | #include "gdb_vecs.h" |
25 | #include "symfile.h" | |
26 | #include "objfiles.h" | |
27 | #include "filenames.h" | |
2938e6cf | 28 | #include "gdbcore.h" |
dc294be5 | 29 | |
7c50a931 | 30 | /* See build-id.h. */ |
dc294be5 | 31 | |
c74f7d1c | 32 | const struct bfd_build_id * |
dc294be5 TT |
33 | build_id_bfd_get (bfd *abfd) |
34 | { | |
c74f7d1c | 35 | if (!bfd_check_format (abfd, bfd_object)) |
dc294be5 TT |
36 | return NULL; |
37 | ||
c74f7d1c JT |
38 | if (abfd->build_id != NULL) |
39 | return abfd->build_id; | |
40 | ||
41 | /* No build-id */ | |
42 | return NULL; | |
dc294be5 TT |
43 | } |
44 | ||
45 | /* See build-id.h. */ | |
46 | ||
47 | int | |
48 | build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check) | |
49 | { | |
c74f7d1c | 50 | const struct bfd_build_id *found; |
dc294be5 TT |
51 | int retval = 0; |
52 | ||
53 | found = build_id_bfd_get (abfd); | |
54 | ||
55 | if (found == NULL) | |
56 | warning (_("File \"%s\" has no build-id, file skipped"), | |
57 | bfd_get_filename (abfd)); | |
58 | else if (found->size != check_len | |
59 | || memcmp (found->data, check, found->size) != 0) | |
60 | warning (_("File \"%s\" has a different build-id, file skipped"), | |
61 | bfd_get_filename (abfd)); | |
62 | else | |
63 | retval = 1; | |
64 | ||
65 | return retval; | |
66 | } | |
67 | ||
68 | /* See build-id.h. */ | |
69 | ||
192b62ce | 70 | gdb_bfd_ref_ptr |
dc294be5 TT |
71 | build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id) |
72 | { | |
73 | char *link, *debugdir; | |
dc294be5 | 74 | int ix; |
192b62ce | 75 | gdb_bfd_ref_ptr abfd; |
224c3ddb | 76 | int alloc_len; |
dc294be5 TT |
77 | |
78 | /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */ | |
224c3ddb SM |
79 | alloc_len = (strlen (debug_file_directory) |
80 | + (sizeof "/.build-id/" - 1) + 1 | |
81 | + 2 * build_id_len + (sizeof ".debug" - 1) + 1); | |
82 | link = (char *) alloca (alloc_len); | |
dc294be5 TT |
83 | |
84 | /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will | |
85 | cause "/.build-id/..." lookups. */ | |
86 | ||
e80aaf61 SM |
87 | std::vector<gdb::unique_xmalloc_ptr<char>> debugdir_vec |
88 | = dirnames_to_char_ptr_vec (debug_file_directory); | |
dc294be5 | 89 | |
e80aaf61 | 90 | for (const gdb::unique_xmalloc_ptr<char> &debugdir : debugdir_vec) |
dc294be5 | 91 | { |
e80aaf61 | 92 | size_t debugdir_len = strlen (debugdir.get ()); |
dc294be5 TT |
93 | const gdb_byte *data = build_id; |
94 | size_t size = build_id_len; | |
95 | char *s; | |
dc294be5 | 96 | |
e80aaf61 | 97 | memcpy (link, debugdir.get (), debugdir_len); |
dc294be5 TT |
98 | s = &link[debugdir_len]; |
99 | s += sprintf (s, "/.build-id/"); | |
100 | if (size > 0) | |
101 | { | |
102 | size--; | |
103 | s += sprintf (s, "%02x", (unsigned) *data++); | |
104 | } | |
105 | if (size > 0) | |
106 | *s++ = '/'; | |
107 | while (size-- > 0) | |
108 | s += sprintf (s, "%02x", (unsigned) *data++); | |
109 | strcpy (s, ".debug"); | |
110 | ||
c4dcb155 SM |
111 | if (separate_debug_file_debug) |
112 | printf_unfiltered (_(" Trying %s\n"), link); | |
113 | ||
dc294be5 | 114 | /* lrealpath() is expensive even for the usually non-existent files. */ |
58ef3771 | 115 | gdb::unique_xmalloc_ptr<char> filename; |
dc294be5 | 116 | if (access (link, F_OK) == 0) |
58ef3771 | 117 | filename.reset (lrealpath (link)); |
dc294be5 TT |
118 | |
119 | if (filename == NULL) | |
120 | continue; | |
121 | ||
122 | /* We expect to be silent on the non-existing files. */ | |
58ef3771 | 123 | abfd = gdb_bfd_open (filename.get (), gnutarget, -1); |
32fad71f | 124 | |
dc294be5 TT |
125 | if (abfd == NULL) |
126 | continue; | |
127 | ||
192b62ce | 128 | if (build_id_verify (abfd.get(), build_id_len, build_id)) |
dc294be5 TT |
129 | break; |
130 | ||
192b62ce | 131 | abfd.release (); |
dc294be5 TT |
132 | } |
133 | ||
dc294be5 TT |
134 | return abfd; |
135 | } | |
136 | ||
137 | /* See build-id.h. */ | |
138 | ||
a8dbfd58 | 139 | std::string |
dc294be5 TT |
140 | find_separate_debug_file_by_buildid (struct objfile *objfile) |
141 | { | |
c74f7d1c | 142 | const struct bfd_build_id *build_id; |
dc294be5 TT |
143 | |
144 | build_id = build_id_bfd_get (objfile->obfd); | |
145 | if (build_id != NULL) | |
146 | { | |
c4dcb155 SM |
147 | if (separate_debug_file_debug) |
148 | printf_unfiltered (_("\nLooking for separate debug info (build-id) for " | |
149 | "%s\n"), objfile_name (objfile)); | |
150 | ||
192b62ce TT |
151 | gdb_bfd_ref_ptr abfd (build_id_to_debug_bfd (build_id->size, |
152 | build_id->data)); | |
dc294be5 TT |
153 | /* Prevent looping on a stripped .debug file. */ |
154 | if (abfd != NULL | |
192b62ce | 155 | && filename_cmp (bfd_get_filename (abfd.get ()), |
dc294be5 | 156 | objfile_name (objfile)) == 0) |
192b62ce TT |
157 | warning (_("\"%s\": separate debug info file has no debug info"), |
158 | bfd_get_filename (abfd.get ())); | |
dc294be5 | 159 | else if (abfd != NULL) |
a8dbfd58 | 160 | return std::string (bfd_get_filename (abfd.get ())); |
dc294be5 | 161 | } |
a8dbfd58 SM |
162 | |
163 | return std::string (); | |
dc294be5 | 164 | } |