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
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
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
263
264
265
266
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}
332
