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Commit | Line | Data |
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f048d548 NK |
1 | #include <stdio.h> |
2 | #include <stdlib.h> | |
3 | #include <string.h> | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | ||
86c98cab | 7 | #include "util/dso.h" |
f048d548 NK |
8 | #include "util/util.h" |
9 | #include "util/debug.h" | |
10 | ||
85c116a6 AK |
11 | #include "symbol.h" |
12 | ||
2f48fcd8 RV |
13 | #ifdef HAVE_LIBBFD_SUPPORT |
14 | ||
15 | /* | |
16 | * Implement addr2line using libbfd. | |
17 | */ | |
18 | #define PACKAGE "perf" | |
19 | #include <bfd.h> | |
20 | ||
21 | struct a2l_data { | |
22 | const char *input; | |
ac931f87 | 23 | u64 addr; |
2f48fcd8 RV |
24 | |
25 | bool found; | |
26 | const char *filename; | |
27 | const char *funcname; | |
28 | unsigned line; | |
29 | ||
30 | bfd *abfd; | |
31 | asymbol **syms; | |
32 | }; | |
33 | ||
34 | static int bfd_error(const char *string) | |
35 | { | |
36 | const char *errmsg; | |
37 | ||
38 | errmsg = bfd_errmsg(bfd_get_error()); | |
39 | fflush(stdout); | |
40 | ||
41 | if (string) | |
42 | pr_debug("%s: %s\n", string, errmsg); | |
43 | else | |
44 | pr_debug("%s\n", errmsg); | |
45 | ||
46 | return -1; | |
47 | } | |
48 | ||
49 | static int slurp_symtab(bfd *abfd, struct a2l_data *a2l) | |
50 | { | |
51 | long storage; | |
52 | long symcount; | |
53 | asymbol **syms; | |
54 | bfd_boolean dynamic = FALSE; | |
55 | ||
56 | if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0) | |
57 | return bfd_error(bfd_get_filename(abfd)); | |
58 | ||
59 | storage = bfd_get_symtab_upper_bound(abfd); | |
60 | if (storage == 0L) { | |
61 | storage = bfd_get_dynamic_symtab_upper_bound(abfd); | |
62 | dynamic = TRUE; | |
63 | } | |
64 | if (storage < 0L) | |
65 | return bfd_error(bfd_get_filename(abfd)); | |
66 | ||
67 | syms = malloc(storage); | |
68 | if (dynamic) | |
69 | symcount = bfd_canonicalize_dynamic_symtab(abfd, syms); | |
70 | else | |
71 | symcount = bfd_canonicalize_symtab(abfd, syms); | |
72 | ||
73 | if (symcount < 0) { | |
74 | free(syms); | |
75 | return bfd_error(bfd_get_filename(abfd)); | |
76 | } | |
77 | ||
78 | a2l->syms = syms; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static void find_address_in_section(bfd *abfd, asection *section, void *data) | |
83 | { | |
84 | bfd_vma pc, vma; | |
85 | bfd_size_type size; | |
86 | struct a2l_data *a2l = data; | |
87 | ||
88 | if (a2l->found) | |
89 | return; | |
90 | ||
91 | if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0) | |
92 | return; | |
93 | ||
94 | pc = a2l->addr; | |
95 | vma = bfd_get_section_vma(abfd, section); | |
96 | size = bfd_get_section_size(section); | |
97 | ||
98 | if (pc < vma || pc >= vma + size) | |
99 | return; | |
100 | ||
101 | a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma, | |
102 | &a2l->filename, &a2l->funcname, | |
103 | &a2l->line); | |
104 | } | |
105 | ||
106 | static struct a2l_data *addr2line_init(const char *path) | |
107 | { | |
108 | bfd *abfd; | |
109 | struct a2l_data *a2l = NULL; | |
110 | ||
111 | abfd = bfd_openr(path, NULL); | |
112 | if (abfd == NULL) | |
113 | return NULL; | |
114 | ||
115 | if (!bfd_check_format(abfd, bfd_object)) | |
116 | goto out; | |
117 | ||
118 | a2l = zalloc(sizeof(*a2l)); | |
119 | if (a2l == NULL) | |
120 | goto out; | |
121 | ||
122 | a2l->abfd = abfd; | |
123 | a2l->input = strdup(path); | |
124 | if (a2l->input == NULL) | |
125 | goto out; | |
126 | ||
127 | if (slurp_symtab(abfd, a2l)) | |
128 | goto out; | |
129 | ||
130 | return a2l; | |
131 | ||
132 | out: | |
133 | if (a2l) { | |
7d16c634 | 134 | zfree((char **)&a2l->input); |
2f48fcd8 RV |
135 | free(a2l); |
136 | } | |
137 | bfd_close(abfd); | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | static void addr2line_cleanup(struct a2l_data *a2l) | |
142 | { | |
143 | if (a2l->abfd) | |
144 | bfd_close(a2l->abfd); | |
7d16c634 | 145 | zfree((char **)&a2l->input); |
74cf249d | 146 | zfree(&a2l->syms); |
2f48fcd8 RV |
147 | free(a2l); |
148 | } | |
149 | ||
ac931f87 | 150 | static int addr2line(const char *dso_name, u64 addr, |
454ff00f | 151 | char **file, unsigned int *line, struct dso *dso) |
2f48fcd8 RV |
152 | { |
153 | int ret = 0; | |
454ff00f AH |
154 | struct a2l_data *a2l = dso->a2l; |
155 | ||
156 | if (!a2l) { | |
157 | dso->a2l = addr2line_init(dso_name); | |
158 | a2l = dso->a2l; | |
159 | } | |
2f48fcd8 | 160 | |
2f48fcd8 RV |
161 | if (a2l == NULL) { |
162 | pr_warning("addr2line_init failed for %s\n", dso_name); | |
163 | return 0; | |
164 | } | |
165 | ||
166 | a2l->addr = addr; | |
454ff00f AH |
167 | a2l->found = false; |
168 | ||
2f48fcd8 RV |
169 | bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l); |
170 | ||
171 | if (a2l->found && a2l->filename) { | |
172 | *file = strdup(a2l->filename); | |
173 | *line = a2l->line; | |
174 | ||
175 | if (*file) | |
176 | ret = 1; | |
177 | } | |
178 | ||
2f48fcd8 RV |
179 | return ret; |
180 | } | |
181 | ||
454ff00f AH |
182 | void dso__free_a2l(struct dso *dso) |
183 | { | |
184 | struct a2l_data *a2l = dso->a2l; | |
185 | ||
186 | if (!a2l) | |
187 | return; | |
188 | ||
189 | addr2line_cleanup(a2l); | |
190 | ||
191 | dso->a2l = NULL; | |
192 | } | |
193 | ||
2f48fcd8 RV |
194 | #else /* HAVE_LIBBFD_SUPPORT */ |
195 | ||
ac931f87 | 196 | static int addr2line(const char *dso_name, u64 addr, |
454ff00f AH |
197 | char **file, unsigned int *line_nr, |
198 | struct dso *dso __maybe_unused) | |
f048d548 NK |
199 | { |
200 | FILE *fp; | |
201 | char cmd[PATH_MAX]; | |
202 | char *filename = NULL; | |
203 | size_t len; | |
204 | char *sep; | |
205 | int ret = 0; | |
206 | ||
207 | scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64, | |
208 | dso_name, addr); | |
209 | ||
210 | fp = popen(cmd, "r"); | |
211 | if (fp == NULL) { | |
212 | pr_warning("popen failed for %s\n", dso_name); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | if (getline(&filename, &len, fp) < 0 || !len) { | |
217 | pr_warning("addr2line has no output for %s\n", dso_name); | |
218 | goto out; | |
219 | } | |
220 | ||
221 | sep = strchr(filename, '\n'); | |
222 | if (sep) | |
223 | *sep = '\0'; | |
224 | ||
225 | if (!strcmp(filename, "??:0")) { | |
226 | pr_debug("no debugging info in %s\n", dso_name); | |
227 | free(filename); | |
228 | goto out; | |
229 | } | |
230 | ||
231 | sep = strchr(filename, ':'); | |
232 | if (sep) { | |
233 | *sep++ = '\0'; | |
234 | *file = filename; | |
235 | *line_nr = strtoul(sep, NULL, 0); | |
236 | ret = 1; | |
237 | } | |
238 | out: | |
239 | pclose(fp); | |
240 | return ret; | |
241 | } | |
454ff00f AH |
242 | |
243 | void dso__free_a2l(struct dso *dso __maybe_unused) | |
244 | { | |
245 | } | |
246 | ||
2f48fcd8 | 247 | #endif /* HAVE_LIBBFD_SUPPORT */ |
f048d548 | 248 | |
906049c8 AH |
249 | /* |
250 | * Number of addr2line failures (without success) before disabling it for that | |
251 | * dso. | |
252 | */ | |
253 | #define A2L_FAIL_LIMIT 123 | |
254 | ||
ac931f87 | 255 | char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym, |
85c116a6 | 256 | bool show_sym) |
f048d548 | 257 | { |
a949fffb DA |
258 | char *file = NULL; |
259 | unsigned line = 0; | |
2cc9d0ef | 260 | char *srcline; |
bf4414ae | 261 | const char *dso_name; |
f048d548 | 262 | |
2cc9d0ef | 263 | if (!dso->has_srcline) |
23f0981b | 264 | goto out; |
2cc9d0ef | 265 | |
0058aef6 AH |
266 | if (dso->symsrc_filename) |
267 | dso_name = dso->symsrc_filename; | |
268 | else | |
269 | dso_name = dso->long_name; | |
270 | ||
58d91a00 NK |
271 | if (dso_name[0] == '[') |
272 | goto out; | |
273 | ||
274 | if (!strncmp(dso_name, "/tmp/perf-", 10)) | |
275 | goto out; | |
276 | ||
454ff00f | 277 | if (!addr2line(dso_name, addr, &file, &line, dso)) |
58d91a00 | 278 | goto out; |
f048d548 | 279 | |
2de21768 | 280 | if (asprintf(&srcline, "%s:%u", basename(file), line) < 0) { |
906049c8 AH |
281 | free(file); |
282 | goto out; | |
283 | } | |
284 | ||
285 | dso->a2l_fails = 0; | |
f048d548 NK |
286 | |
287 | free(file); | |
288 | return srcline; | |
2cc9d0ef NK |
289 | |
290 | out: | |
906049c8 AH |
291 | if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) { |
292 | dso->has_srcline = 0; | |
293 | dso__free_a2l(dso); | |
294 | } | |
85c116a6 | 295 | if (sym) { |
ac931f87 | 296 | if (asprintf(&srcline, "%s+%" PRIu64, show_sym ? sym->name : "", |
85c116a6 AK |
297 | addr - sym->start) < 0) |
298 | return SRCLINE_UNKNOWN; | |
ac931f87 | 299 | } else if (asprintf(&srcline, "%s[%" PRIx64 "]", dso->short_name, addr) < 0) |
23f0981b AK |
300 | return SRCLINE_UNKNOWN; |
301 | return srcline; | |
f048d548 NK |
302 | } |
303 | ||
304 | void free_srcline(char *srcline) | |
305 | { | |
306 | if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0) | |
307 | free(srcline); | |
308 | } |