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1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4
5#include <linux/kernel.h>
6
7#include "util/dso.h"
8#include "util/util.h"
9#include "util/debug.h"
10
11#include "symbol.h"
12
13bool srcline_full_filename;
14
15#ifdef HAVE_LIBBFD_SUPPORT
16
17/*
18 * Implement addr2line using libbfd.
19 */
20#define PACKAGE "perf"
21#include <bfd.h>
22
23struct a2l_data {
24 const char *input;
25 u64 addr;
26
27 bool found;
28 const char *filename;
29 const char *funcname;
30 unsigned line;
31
32 bfd *abfd;
33 asymbol **syms;
34};
35
36static int bfd_error(const char *string)
37{
38 const char *errmsg;
39
40 errmsg = bfd_errmsg(bfd_get_error());
41 fflush(stdout);
42
43 if (string)
44 pr_debug("%s: %s\n", string, errmsg);
45 else
46 pr_debug("%s\n", errmsg);
47
48 return -1;
49}
50
51static int slurp_symtab(bfd *abfd, struct a2l_data *a2l)
52{
53 long storage;
54 long symcount;
55 asymbol **syms;
56 bfd_boolean dynamic = FALSE;
57
58 if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0)
59 return bfd_error(bfd_get_filename(abfd));
60
61 storage = bfd_get_symtab_upper_bound(abfd);
62 if (storage == 0L) {
63 storage = bfd_get_dynamic_symtab_upper_bound(abfd);
64 dynamic = TRUE;
65 }
66 if (storage < 0L)
67 return bfd_error(bfd_get_filename(abfd));
68
69 syms = malloc(storage);
70 if (dynamic)
71 symcount = bfd_canonicalize_dynamic_symtab(abfd, syms);
72 else
73 symcount = bfd_canonicalize_symtab(abfd, syms);
74
75 if (symcount < 0) {
76 free(syms);
77 return bfd_error(bfd_get_filename(abfd));
78 }
79
80 a2l->syms = syms;
81 return 0;
82}
83
84static void find_address_in_section(bfd *abfd, asection *section, void *data)
85{
86 bfd_vma pc, vma;
87 bfd_size_type size;
88 struct a2l_data *a2l = data;
89
90 if (a2l->found)
91 return;
92
93 if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0)
94 return;
95
96 pc = a2l->addr;
97 vma = bfd_get_section_vma(abfd, section);
98 size = bfd_get_section_size(section);
99
100 if (pc < vma || pc >= vma + size)
101 return;
102
103 a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma,
104 &a2l->filename, &a2l->funcname,
105 &a2l->line);
106}
107
108static struct a2l_data *addr2line_init(const char *path)
109{
110 bfd *abfd;
111 struct a2l_data *a2l = NULL;
112
113 abfd = bfd_openr(path, NULL);
114 if (abfd == NULL)
115 return NULL;
116
117 if (!bfd_check_format(abfd, bfd_object))
118 goto out;
119
120 a2l = zalloc(sizeof(*a2l));
121 if (a2l == NULL)
122 goto out;
123
124 a2l->abfd = abfd;
125 a2l->input = strdup(path);
126 if (a2l->input == NULL)
127 goto out;
128
129 if (slurp_symtab(abfd, a2l))
130 goto out;
131
132 return a2l;
133
134out:
135 if (a2l) {
136 zfree((char **)&a2l->input);
137 free(a2l);
138 }
139 bfd_close(abfd);
140 return NULL;
141}
142
143static void addr2line_cleanup(struct a2l_data *a2l)
144{
145 if (a2l->abfd)
146 bfd_close(a2l->abfd);
147 zfree((char **)&a2l->input);
148 zfree(&a2l->syms);
149 free(a2l);
150}
151
152#define MAX_INLINE_NEST 1024
153
154static int addr2line(const char *dso_name, u64 addr,
155 char **file, unsigned int *line, struct dso *dso,
156 bool unwind_inlines)
157{
158 int ret = 0;
159 struct a2l_data *a2l = dso->a2l;
160
161 if (!a2l) {
162 dso->a2l = addr2line_init(dso_name);
163 a2l = dso->a2l;
164 }
165
166 if (a2l == NULL) {
167 pr_warning("addr2line_init failed for %s\n", dso_name);
168 return 0;
169 }
170
171 a2l->addr = addr;
172 a2l->found = false;
173
174 bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l);
175
176 if (a2l->found && unwind_inlines) {
177 int cnt = 0;
178
179 while (bfd_find_inliner_info(a2l->abfd, &a2l->filename,
180 &a2l->funcname, &a2l->line) &&
181 cnt++ < MAX_INLINE_NEST)
182 ;
183 }
184
185 if (a2l->found && a2l->filename) {
186 *file = strdup(a2l->filename);
187 *line = a2l->line;
188
189 if (*file)
190 ret = 1;
191 }
192
193 return ret;
194}
195
196void dso__free_a2l(struct dso *dso)
197{
198 struct a2l_data *a2l = dso->a2l;
199
200 if (!a2l)
201 return;
202
203 addr2line_cleanup(a2l);
204
205 dso->a2l = NULL;
206}
207
208#else /* HAVE_LIBBFD_SUPPORT */
209
210static int addr2line(const char *dso_name, u64 addr,
211 char **file, unsigned int *line_nr,
212 struct dso *dso __maybe_unused,
213 bool unwind_inlines __maybe_unused)
214{
215 FILE *fp;
216 char cmd[PATH_MAX];
217 char *filename = NULL;
218 size_t len;
219 char *sep;
220 int ret = 0;
221
222 scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64,
223 dso_name, addr);
224
225 fp = popen(cmd, "r");
226 if (fp == NULL) {
227 pr_warning("popen failed for %s\n", dso_name);
228 return 0;
229 }
230
231 if (getline(&filename, &len, fp) < 0 || !len) {
232 pr_warning("addr2line has no output for %s\n", dso_name);
233 goto out;
234 }
235
236 sep = strchr(filename, '\n');
237 if (sep)
238 *sep = '\0';
239
240 if (!strcmp(filename, "??:0")) {
241 pr_debug("no debugging info in %s\n", dso_name);
242 free(filename);
243 goto out;
244 }
245
246 sep = strchr(filename, ':');
247 if (sep) {
248 *sep++ = '\0';
249 *file = filename;
250 *line_nr = strtoul(sep, NULL, 0);
251 ret = 1;
252 }
253out:
254 pclose(fp);
255 return ret;
256}
257
258void dso__free_a2l(struct dso *dso __maybe_unused)
259{
260}
261
262#endif /* HAVE_LIBBFD_SUPPORT */
263
264/*
265 * Number of addr2line failures (without success) before disabling it for that
266 * dso.
267 */
268#define A2L_FAIL_LIMIT 123
269
270char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
271 bool show_sym, bool unwind_inlines)
272{
273 char *file = NULL;
274 unsigned line = 0;
275 char *srcline;
276 const char *dso_name;
277
278 if (!dso->has_srcline)
279 goto out;
280
281 if (dso->symsrc_filename)
282 dso_name = dso->symsrc_filename;
283 else
284 dso_name = dso->long_name;
285
286 if (dso_name[0] == '[')
287 goto out;
288
289 if (!strncmp(dso_name, "/tmp/perf-", 10))
290 goto out;
291
292 if (!addr2line(dso_name, addr, &file, &line, dso, unwind_inlines))
293 goto out;
294
295 if (asprintf(&srcline, "%s:%u",
296 srcline_full_filename ? file : basename(file),
297 line) < 0) {
298 free(file);
299 goto out;
300 }
301
302 dso->a2l_fails = 0;
303
304 free(file);
305 return srcline;
306
307out:
308 if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
309 dso->has_srcline = 0;
310 dso__free_a2l(dso);
311 }
312 if (sym) {
313 if (asprintf(&srcline, "%s+%" PRIu64, show_sym ? sym->name : "",
314 addr - sym->start) < 0)
315 return SRCLINE_UNKNOWN;
316 } else if (asprintf(&srcline, "%s[%" PRIx64 "]", dso->short_name, addr) < 0)
317 return SRCLINE_UNKNOWN;
318 return srcline;
319}
320
321void free_srcline(char *srcline)
322{
323 if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0)
324 free(srcline);
325}
326
327char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
328 bool show_sym)
329{
330 return __get_srcline(dso, addr, sym, show_sym, false);
331}
1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4
5#include <linux/kernel.h>
6
7#include "util/dso.h"
8#include "util/util.h"
9#include "util/debug.h"
10
11#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) {
132 zfree((char **)&a2l->input);
133 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);
143 zfree((char **)&a2l->input);
144 zfree(&a2l->syms);
145 free(a2l);
146}
147
148static int addr2line(const char *dso_name, unsigned long addr,
149 char **file, unsigned int *line, struct dso *dso)
150{
151 int ret = 0;
152 struct a2l_data *a2l = dso->a2l;
153
154 if (!a2l) {
155 dso->a2l = addr2line_init(dso_name);
156 a2l = dso->a2l;
157 }
158
159 if (a2l == NULL) {
160 pr_warning("addr2line_init failed for %s\n", dso_name);
161 return 0;
162 }
163
164 a2l->addr = addr;
165 a2l->found = false;
166
167 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
177 return ret;
178}
179
180void 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
192#else /* HAVE_LIBBFD_SUPPORT */
193
194static int addr2line(const char *dso_name, unsigned long addr,
195 char **file, unsigned int *line_nr,
196 struct dso *dso __maybe_unused)
197{
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}
240
241void dso__free_a2l(struct dso *dso __maybe_unused)
242{
243}
244
245#endif /* HAVE_LIBBFD_SUPPORT */
246
247/*
248 * Number of addr2line failures (without success) before disabling it for that
249 * dso.
250 */
251#define A2L_FAIL_LIMIT 123
252
253char *get_srcline(struct dso *dso, unsigned long addr)
254{
255 char *file = NULL;
256 unsigned line = 0;
257 char *srcline;
258 const char *dso_name;
259
260 if (!dso->has_srcline)
261 return SRCLINE_UNKNOWN;
262
263 if (dso->symsrc_filename)
264 dso_name = dso->symsrc_filename;
265 else
266 dso_name = dso->long_name;
267
268 if (dso_name[0] == '[')
269 goto out;
270
271 if (!strncmp(dso_name, "/tmp/perf-", 10))
272 goto out;
273
274 if (!addr2line(dso_name, addr, &file, &line, dso))
275 goto out;
276
277 if (asprintf(&srcline, "%s:%u", file, line) < 0) {
278 free(file);
279 goto out;
280 }
281
282 dso->a2l_fails = 0;
283
284 free(file);
285 return srcline;
286
287out:
288 if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
289 dso->has_srcline = 0;
290 dso__free_a2l(dso);
291 }
292 return SRCLINE_UNKNOWN;
293}
294
295void free_srcline(char *srcline)
296{
297 if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0)
298 free(srcline);
299}