blob: f3e4bc5fe5d214444594193197509fe161bf7104 [file] [log] [blame]
Namhyung Kimf048d542013-09-11 14:09:28 +09001#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4
5#include <linux/kernel.h>
6
Namhyung Kim86c98ca2013-09-11 14:09:30 +09007#include "util/dso.h"
Namhyung Kimf048d542013-09-11 14:09:28 +09008#include "util/util.h"
9#include "util/debug.h"
10
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +090011#ifdef HAVE_LIBBFD_SUPPORT
12
13/*
14 * Implement addr2line using libbfd.
15 */
16#define PACKAGE "perf"
17#include <bfd.h>
18
19struct a2l_data {
20 const char *input;
21 unsigned long addr;
22
23 bool found;
24 const char *filename;
25 const char *funcname;
26 unsigned line;
27
28 bfd *abfd;
29 asymbol **syms;
30};
31
32static int bfd_error(const char *string)
33{
34 const char *errmsg;
35
36 errmsg = bfd_errmsg(bfd_get_error());
37 fflush(stdout);
38
39 if (string)
40 pr_debug("%s: %s\n", string, errmsg);
41 else
42 pr_debug("%s\n", errmsg);
43
44 return -1;
45}
46
47static int slurp_symtab(bfd *abfd, struct a2l_data *a2l)
48{
49 long storage;
50 long symcount;
51 asymbol **syms;
52 bfd_boolean dynamic = FALSE;
53
54 if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0)
55 return bfd_error(bfd_get_filename(abfd));
56
57 storage = bfd_get_symtab_upper_bound(abfd);
58 if (storage == 0L) {
59 storage = bfd_get_dynamic_symtab_upper_bound(abfd);
60 dynamic = TRUE;
61 }
62 if (storage < 0L)
63 return bfd_error(bfd_get_filename(abfd));
64
65 syms = malloc(storage);
66 if (dynamic)
67 symcount = bfd_canonicalize_dynamic_symtab(abfd, syms);
68 else
69 symcount = bfd_canonicalize_symtab(abfd, syms);
70
71 if (symcount < 0) {
72 free(syms);
73 return bfd_error(bfd_get_filename(abfd));
74 }
75
76 a2l->syms = syms;
77 return 0;
78}
79
80static void find_address_in_section(bfd *abfd, asection *section, void *data)
81{
82 bfd_vma pc, vma;
83 bfd_size_type size;
84 struct a2l_data *a2l = data;
85
86 if (a2l->found)
87 return;
88
89 if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0)
90 return;
91
92 pc = a2l->addr;
93 vma = bfd_get_section_vma(abfd, section);
94 size = bfd_get_section_size(section);
95
96 if (pc < vma || pc >= vma + size)
97 return;
98
99 a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma,
100 &a2l->filename, &a2l->funcname,
101 &a2l->line);
102}
103
104static struct a2l_data *addr2line_init(const char *path)
105{
106 bfd *abfd;
107 struct a2l_data *a2l = NULL;
108
109 abfd = bfd_openr(path, NULL);
110 if (abfd == NULL)
111 return NULL;
112
113 if (!bfd_check_format(abfd, bfd_object))
114 goto out;
115
116 a2l = zalloc(sizeof(*a2l));
117 if (a2l == NULL)
118 goto out;
119
120 a2l->abfd = abfd;
121 a2l->input = strdup(path);
122 if (a2l->input == NULL)
123 goto out;
124
125 if (slurp_symtab(abfd, a2l))
126 goto out;
127
128 return a2l;
129
130out:
131 if (a2l) {
Namhyung Kim7d16c632014-01-09 23:07:59 +0900132 zfree((char **)&a2l->input);
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900133 free(a2l);
134 }
135 bfd_close(abfd);
136 return NULL;
137}
138
139static void addr2line_cleanup(struct a2l_data *a2l)
140{
141 if (a2l->abfd)
142 bfd_close(a2l->abfd);
Namhyung Kim7d16c632014-01-09 23:07:59 +0900143 zfree((char **)&a2l->input);
Arnaldo Carvalho de Melo74cf2492013-12-27 16:55:14 -0300144 zfree(&a2l->syms);
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900145 free(a2l);
146}
147
148static int addr2line(const char *dso_name, unsigned long addr,
Adrian Hunter454ff002013-12-03 09:23:07 +0200149 char **file, unsigned int *line, struct dso *dso)
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900150{
151 int ret = 0;
Adrian Hunter454ff002013-12-03 09:23:07 +0200152 struct a2l_data *a2l = dso->a2l;
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900153
Adrian Hunter454ff002013-12-03 09:23:07 +0200154 if (!a2l) {
155 dso->a2l = addr2line_init(dso_name);
156 a2l = dso->a2l;
157 }
158
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900159 if (a2l == NULL) {
160 pr_warning("addr2line_init failed for %s\n", dso_name);
161 return 0;
162 }
163
164 a2l->addr = addr;
Adrian Hunter454ff002013-12-03 09:23:07 +0200165 a2l->found = false;
166
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900167 bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l);
168
169 if (a2l->found && a2l->filename) {
170 *file = strdup(a2l->filename);
171 *line = a2l->line;
172
173 if (*file)
174 ret = 1;
175 }
176
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900177 return ret;
178}
179
Adrian Hunter454ff002013-12-03 09:23:07 +0200180void dso__free_a2l(struct dso *dso)
181{
182 struct a2l_data *a2l = dso->a2l;
183
184 if (!a2l)
185 return;
186
187 addr2line_cleanup(a2l);
188
189 dso->a2l = NULL;
190}
191
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900192#else /* HAVE_LIBBFD_SUPPORT */
193
Namhyung Kimf048d542013-09-11 14:09:28 +0900194static int addr2line(const char *dso_name, unsigned long addr,
Adrian Hunter454ff002013-12-03 09:23:07 +0200195 char **file, unsigned int *line_nr,
196 struct dso *dso __maybe_unused)
Namhyung Kimf048d542013-09-11 14:09:28 +0900197{
198 FILE *fp;
199 char cmd[PATH_MAX];
200 char *filename = NULL;
201 size_t len;
202 char *sep;
203 int ret = 0;
204
205 scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64,
206 dso_name, addr);
207
208 fp = popen(cmd, "r");
209 if (fp == NULL) {
210 pr_warning("popen failed for %s\n", dso_name);
211 return 0;
212 }
213
214 if (getline(&filename, &len, fp) < 0 || !len) {
215 pr_warning("addr2line has no output for %s\n", dso_name);
216 goto out;
217 }
218
219 sep = strchr(filename, '\n');
220 if (sep)
221 *sep = '\0';
222
223 if (!strcmp(filename, "??:0")) {
224 pr_debug("no debugging info in %s\n", dso_name);
225 free(filename);
226 goto out;
227 }
228
229 sep = strchr(filename, ':');
230 if (sep) {
231 *sep++ = '\0';
232 *file = filename;
233 *line_nr = strtoul(sep, NULL, 0);
234 ret = 1;
235 }
236out:
237 pclose(fp);
238 return ret;
239}
Adrian Hunter454ff002013-12-03 09:23:07 +0200240
241void dso__free_a2l(struct dso *dso __maybe_unused)
242{
243}
244
Roberto Vitillo2f48fcd2013-09-11 14:09:32 +0900245#endif /* HAVE_LIBBFD_SUPPORT */
Namhyung Kimf048d542013-09-11 14:09:28 +0900246
Adrian Hunter906049c82013-12-03 09:23:10 +0200247/*
248 * Number of addr2line failures (without success) before disabling it for that
249 * dso.
250 */
251#define A2L_FAIL_LIMIT 123
252
Namhyung Kim86c98ca2013-09-11 14:09:30 +0900253char *get_srcline(struct dso *dso, unsigned long addr)
Namhyung Kimf048d542013-09-11 14:09:28 +0900254{
David Aherna949fff2013-10-09 21:51:31 -0600255 char *file = NULL;
256 unsigned line = 0;
Namhyung Kim2cc9d0e2013-09-11 14:09:31 +0900257 char *srcline;
Arnaldo Carvalho de Melobf4414a2013-12-10 15:19:23 -0300258 const char *dso_name;
Namhyung Kimf048d542013-09-11 14:09:28 +0900259
Namhyung Kim2cc9d0e2013-09-11 14:09:31 +0900260 if (!dso->has_srcline)
261 return SRCLINE_UNKNOWN;
262
Adrian Hunter0058aef2013-12-03 09:23:08 +0200263 if (dso->symsrc_filename)
264 dso_name = dso->symsrc_filename;
265 else
266 dso_name = dso->long_name;
267
Namhyung Kim58d91a02013-09-11 14:09:29 +0900268 if (dso_name[0] == '[')
269 goto out;
270
271 if (!strncmp(dso_name, "/tmp/perf-", 10))
272 goto out;
273
Adrian Hunter454ff002013-12-03 09:23:07 +0200274 if (!addr2line(dso_name, addr, &file, &line, dso))
Namhyung Kim58d91a02013-09-11 14:09:29 +0900275 goto out;
Namhyung Kimf048d542013-09-11 14:09:28 +0900276
Adrian Hunter906049c82013-12-03 09:23:10 +0200277 if (asprintf(&srcline, "%s:%u", file, line) < 0) {
278 free(file);
279 goto out;
280 }
281
282 dso->a2l_fails = 0;
Namhyung Kimf048d542013-09-11 14:09:28 +0900283
284 free(file);
Namhyung Kimf048d542013-09-11 14:09:28 +0900285 return srcline;
Namhyung Kim2cc9d0e2013-09-11 14:09:31 +0900286
287out:
Adrian Hunter906049c82013-12-03 09:23:10 +0200288 if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
289 dso->has_srcline = 0;
290 dso__free_a2l(dso);
291 }
Namhyung Kim2cc9d0e2013-09-11 14:09:31 +0900292 return SRCLINE_UNKNOWN;
Namhyung Kimf048d542013-09-11 14:09:28 +0900293}
294
295void free_srcline(char *srcline)
296{
297 if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0)
298 free(srcline);
299}