1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/* build-id-related functions.
Copyright (C) 1991-2019 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"
/* Local non-gdb includes. */
#include "bfd.h"
#include "build-id.h"
#include "common/gdb_vecs.h"
#include "filenames.h"
#include "gdb_bfd.h"
#include "gdbcore.h"
#include "objfiles.h"
#include "symfile.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;
}
/* Helper for build_id_to_debug_bfd. LINK is a path to a potential
build-id-based separate debug file, potentially a symlink to the real file.
If the file exists and matches BUILD_ID, return a BFD reference to it. */
static gdb_bfd_ref_ptr
build_id_to_debug_bfd_1 (const std::string &link, size_t build_id_len,
const bfd_byte *build_id)
{
if (separate_debug_file_debug)
{
printf_unfiltered (_(" Trying %s..."), link.c_str ());
gdb_flush (gdb_stdout);
}
/* lrealpath() is expensive even for the usually non-existent files. */
gdb::unique_xmalloc_ptr<char> filename;
if (access (link.c_str (), F_OK) == 0)
filename.reset (lrealpath (link.c_str ()));
if (filename == NULL)
{
if (separate_debug_file_debug)
printf_unfiltered (_(" no, unable to compute real path\n"));
return {};
}
/* We expect to be silent on the non-existing files. */
gdb_bfd_ref_ptr debug_bfd = gdb_bfd_open (filename.get (), gnutarget, -1);
if (debug_bfd == NULL)
{
if (separate_debug_file_debug)
printf_unfiltered (_(" no, unable to open.\n"));
return {};
}
if (!build_id_verify (debug_bfd.get(), build_id_len, build_id))
{
if (separate_debug_file_debug)
printf_unfiltered (_(" no, build-id does not match.\n"));
return {};
}
if (separate_debug_file_debug)
printf_unfiltered (_(" yes!\n"));
return debug_bfd;
}
/* See build-id.h. */
gdb_bfd_ref_ptr
build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id)
{
/* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
cause "/.build-id/..." lookups. */
std::vector<gdb::unique_xmalloc_ptr<char>> debugdir_vec
= dirnames_to_char_ptr_vec (debug_file_directory);
for (const gdb::unique_xmalloc_ptr<char> &debugdir : debugdir_vec)
{
const gdb_byte *data = build_id;
size_t size = build_id_len;
/* Compute where the file named after the build-id would be.
If debugdir is "/usr/lib/debug" and the build-id is abcdef, this will
give "/usr/lib/debug/.build-id/ab/cdef.debug". */
std::string link = debugdir.get ();
link += "/.build-id/";
if (size > 0)
{
size--;
string_appendf (link, "%02x/", (unsigned) *data++);
}
while (size-- > 0)
string_appendf (link, "%02x", (unsigned) *data++);
link += ".debug";
gdb_bfd_ref_ptr debug_bfd
= build_id_to_debug_bfd_1 (link, build_id_len, build_id);
if (debug_bfd != NULL)
return debug_bfd;
/* Try to look under the sysroot as well. If the sysroot is
"/the/sysroot", it will give
"/the/sysroot/usr/lib/debug/.build-id/ab/cdef.debug".
Don't do it if the sysroot is the target system ("target:"). It
could work in theory, but the lrealpath in build_id_to_debug_bfd_1
only works with local paths. */
if (strcmp (gdb_sysroot, TARGET_SYSROOT_PREFIX) != 0)
{
link = gdb_sysroot + link;
debug_bfd = build_id_to_debug_bfd_1 (link, build_id_len, build_id);
if (debug_bfd != NULL)
return debug_bfd;
}
}
return {};
}
/* See build-id.h. */
std::string
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 std::string (bfd_get_filename (abfd.get ()));
}
return std::string ();
}
|
GitWeb