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Commit | Line | Data |
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a2928c42 ACM |
1 | #include "util.h" |
2 | #include "../perf.h" | |
a0055ae2 | 3 | #include "string.h" |
a2928c42 | 4 | #include "symbol.h" |
439d473b | 5 | #include "thread.h" |
a2928c42 | 6 | |
8f28827a FW |
7 | #include "debug.h" |
8 | ||
a2928c42 ACM |
9 | #include <libelf.h> |
10 | #include <gelf.h> | |
11 | #include <elf.h> | |
f1617b40 | 12 | #include <limits.h> |
439d473b | 13 | #include <sys/utsname.h> |
2cdbc46d | 14 | |
94cb9e38 ACM |
15 | enum dso_origin { |
16 | DSO__ORIG_KERNEL = 0, | |
17 | DSO__ORIG_JAVA_JIT, | |
18 | DSO__ORIG_FEDORA, | |
19 | DSO__ORIG_UBUNTU, | |
20 | DSO__ORIG_BUILDID, | |
21 | DSO__ORIG_DSO, | |
439d473b | 22 | DSO__ORIG_KMODULE, |
94cb9e38 ACM |
23 | DSO__ORIG_NOT_FOUND, |
24 | }; | |
25 | ||
439d473b ACM |
26 | static void dsos__add(struct dso *dso); |
27 | static struct dso *dsos__find(const char *name); | |
2e538c4a ACM |
28 | static struct map *map__new2(u64 start, struct dso *dso); |
29 | static void kernel_maps__insert(struct map *map); | |
c338aee8 ACM |
30 | static int dso__load_kernel_sym(struct dso *self, struct map *map, |
31 | symbol_filter_t filter); | |
00a192b3 | 32 | unsigned int symbol__priv_size; |
439d473b | 33 | |
af427bf5 ACM |
34 | static struct rb_root kernel_maps; |
35 | ||
2e538c4a | 36 | static void dso__fixup_sym_end(struct dso *self) |
af427bf5 ACM |
37 | { |
38 | struct rb_node *nd, *prevnd = rb_first(&self->syms); | |
2e538c4a | 39 | struct symbol *curr, *prev; |
af427bf5 ACM |
40 | |
41 | if (prevnd == NULL) | |
42 | return; | |
43 | ||
2e538c4a ACM |
44 | curr = rb_entry(prevnd, struct symbol, rb_node); |
45 | ||
af427bf5 | 46 | for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { |
2e538c4a ACM |
47 | prev = curr; |
48 | curr = rb_entry(nd, struct symbol, rb_node); | |
af427bf5 ACM |
49 | |
50 | if (prev->end == prev->start) | |
51 | prev->end = curr->start - 1; | |
af427bf5 | 52 | } |
2e538c4a ACM |
53 | |
54 | /* Last entry */ | |
55 | if (curr->end == curr->start) | |
56 | curr->end = roundup(curr->start, 4096); | |
af427bf5 ACM |
57 | } |
58 | ||
2e538c4a | 59 | static void kernel_maps__fixup_end(void) |
af427bf5 ACM |
60 | { |
61 | struct map *prev, *curr; | |
62 | struct rb_node *nd, *prevnd = rb_first(&kernel_maps); | |
63 | ||
64 | if (prevnd == NULL) | |
65 | return; | |
66 | ||
67 | curr = rb_entry(prevnd, struct map, rb_node); | |
af427bf5 ACM |
68 | |
69 | for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { | |
70 | prev = curr; | |
71 | curr = rb_entry(nd, struct map, rb_node); | |
72 | prev->end = curr->start - 1; | |
2e538c4a | 73 | } |
af427bf5 ACM |
74 | } |
75 | ||
00a192b3 | 76 | static struct symbol *symbol__new(u64 start, u64 len, const char *name) |
a2928c42 | 77 | { |
0085c954 | 78 | size_t namelen = strlen(name) + 1; |
00a192b3 ACM |
79 | struct symbol *self = calloc(1, (symbol__priv_size + |
80 | sizeof(*self) + namelen)); | |
0b73da3f IM |
81 | if (!self) |
82 | return NULL; | |
83 | ||
00a192b3 ACM |
84 | if (symbol__priv_size) { |
85 | memset(self, 0, symbol__priv_size); | |
86 | self = ((void *)self) + symbol__priv_size; | |
a2928c42 | 87 | } |
0b73da3f | 88 | self->start = start; |
6cfcc53e | 89 | self->end = len ? start + len - 1 : start; |
e4204992 | 90 | |
6beba7ad | 91 | pr_debug3("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end); |
e4204992 | 92 | |
0b73da3f | 93 | memcpy(self->name, name, namelen); |
a2928c42 ACM |
94 | |
95 | return self; | |
96 | } | |
97 | ||
00a192b3 | 98 | static void symbol__delete(struct symbol *self) |
a2928c42 | 99 | { |
00a192b3 | 100 | free(((void *)self) - symbol__priv_size); |
a2928c42 ACM |
101 | } |
102 | ||
103 | static size_t symbol__fprintf(struct symbol *self, FILE *fp) | |
104 | { | |
439d473b | 105 | return fprintf(fp, " %llx-%llx %s\n", |
a2928c42 ACM |
106 | self->start, self->end, self->name); |
107 | } | |
108 | ||
cfc10d3b ACM |
109 | static void dso__set_long_name(struct dso *self, char *name) |
110 | { | |
111 | self->long_name = name; | |
112 | self->long_name_len = strlen(name); | |
113 | } | |
114 | ||
115 | static void dso__set_basename(struct dso *self) | |
116 | { | |
117 | self->short_name = basename(self->long_name); | |
118 | } | |
119 | ||
00a192b3 | 120 | struct dso *dso__new(const char *name) |
a2928c42 ACM |
121 | { |
122 | struct dso *self = malloc(sizeof(*self) + strlen(name) + 1); | |
123 | ||
124 | if (self != NULL) { | |
125 | strcpy(self->name, name); | |
cfc10d3b | 126 | dso__set_long_name(self, self->name); |
439d473b | 127 | self->short_name = self->name; |
a2928c42 | 128 | self->syms = RB_ROOT; |
fc54db51 | 129 | self->find_symbol = dso__find_symbol; |
52d422de | 130 | self->slen_calculated = 0; |
94cb9e38 | 131 | self->origin = DSO__ORIG_NOT_FOUND; |
8d06367f ACM |
132 | self->loaded = 0; |
133 | self->has_build_id = 0; | |
a2928c42 ACM |
134 | } |
135 | ||
136 | return self; | |
137 | } | |
138 | ||
139 | static void dso__delete_symbols(struct dso *self) | |
140 | { | |
141 | struct symbol *pos; | |
142 | struct rb_node *next = rb_first(&self->syms); | |
143 | ||
144 | while (next) { | |
145 | pos = rb_entry(next, struct symbol, rb_node); | |
146 | next = rb_next(&pos->rb_node); | |
c8c96525 | 147 | rb_erase(&pos->rb_node, &self->syms); |
00a192b3 | 148 | symbol__delete(pos); |
a2928c42 ACM |
149 | } |
150 | } | |
151 | ||
152 | void dso__delete(struct dso *self) | |
153 | { | |
154 | dso__delete_symbols(self); | |
439d473b ACM |
155 | if (self->long_name != self->name) |
156 | free(self->long_name); | |
a2928c42 ACM |
157 | free(self); |
158 | } | |
159 | ||
8d06367f ACM |
160 | void dso__set_build_id(struct dso *self, void *build_id) |
161 | { | |
162 | memcpy(self->build_id, build_id, sizeof(self->build_id)); | |
163 | self->has_build_id = 1; | |
164 | } | |
165 | ||
a2928c42 ACM |
166 | static void dso__insert_symbol(struct dso *self, struct symbol *sym) |
167 | { | |
168 | struct rb_node **p = &self->syms.rb_node; | |
169 | struct rb_node *parent = NULL; | |
9cffa8d5 | 170 | const u64 ip = sym->start; |
a2928c42 ACM |
171 | struct symbol *s; |
172 | ||
173 | while (*p != NULL) { | |
174 | parent = *p; | |
175 | s = rb_entry(parent, struct symbol, rb_node); | |
176 | if (ip < s->start) | |
177 | p = &(*p)->rb_left; | |
178 | else | |
179 | p = &(*p)->rb_right; | |
180 | } | |
181 | rb_link_node(&sym->rb_node, parent, p); | |
182 | rb_insert_color(&sym->rb_node, &self->syms); | |
183 | } | |
184 | ||
9cffa8d5 | 185 | struct symbol *dso__find_symbol(struct dso *self, u64 ip) |
a2928c42 ACM |
186 | { |
187 | struct rb_node *n; | |
188 | ||
189 | if (self == NULL) | |
190 | return NULL; | |
191 | ||
192 | n = self->syms.rb_node; | |
193 | ||
194 | while (n) { | |
195 | struct symbol *s = rb_entry(n, struct symbol, rb_node); | |
196 | ||
197 | if (ip < s->start) | |
198 | n = n->rb_left; | |
199 | else if (ip > s->end) | |
200 | n = n->rb_right; | |
201 | else | |
202 | return s; | |
203 | } | |
204 | ||
205 | return NULL; | |
206 | } | |
207 | ||
8d06367f | 208 | int build_id__sprintf(u8 *self, int len, char *bf) |
a2928c42 | 209 | { |
8d06367f ACM |
210 | char *bid = bf; |
211 | u8 *raw = self; | |
212 | int i; | |
a2928c42 | 213 | |
8d06367f ACM |
214 | for (i = 0; i < len; ++i) { |
215 | sprintf(bid, "%02x", *raw); | |
216 | ++raw; | |
217 | bid += 2; | |
218 | } | |
219 | ||
220 | return raw - self; | |
221 | } | |
222 | ||
9e03eb2d | 223 | size_t dso__fprintf_buildid(struct dso *self, FILE *fp) |
8d06367f ACM |
224 | { |
225 | char sbuild_id[BUILD_ID_SIZE * 2 + 1]; | |
8d06367f ACM |
226 | |
227 | build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id); | |
9e03eb2d ACM |
228 | return fprintf(fp, "%s", sbuild_id); |
229 | } | |
230 | ||
231 | size_t dso__fprintf(struct dso *self, FILE *fp) | |
232 | { | |
233 | struct rb_node *nd; | |
234 | size_t ret = fprintf(fp, "dso: %s (", self->short_name); | |
235 | ||
236 | ret += dso__fprintf_buildid(self, fp); | |
237 | ret += fprintf(fp, ")\n"); | |
8d06367f | 238 | |
a2928c42 ACM |
239 | for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) { |
240 | struct symbol *pos = rb_entry(nd, struct symbol, rb_node); | |
241 | ret += symbol__fprintf(pos, fp); | |
242 | } | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
2e538c4a ACM |
247 | /* |
248 | * Loads the function entries in /proc/kallsyms into kernel_map->dso, | |
249 | * so that we can in the next step set the symbol ->end address and then | |
250 | * call kernel_maps__split_kallsyms. | |
251 | */ | |
6beba7ad | 252 | static int kernel_maps__load_all_kallsyms(void) |
a2928c42 | 253 | { |
a2928c42 ACM |
254 | char *line = NULL; |
255 | size_t n; | |
256 | FILE *file = fopen("/proc/kallsyms", "r"); | |
257 | ||
258 | if (file == NULL) | |
259 | goto out_failure; | |
260 | ||
261 | while (!feof(file)) { | |
9cffa8d5 | 262 | u64 start; |
a2928c42 ACM |
263 | struct symbol *sym; |
264 | int line_len, len; | |
265 | char symbol_type; | |
2e538c4a | 266 | char *symbol_name; |
a2928c42 ACM |
267 | |
268 | line_len = getline(&line, &n, file); | |
269 | if (line_len < 0) | |
270 | break; | |
271 | ||
272 | if (!line) | |
273 | goto out_failure; | |
274 | ||
275 | line[--line_len] = '\0'; /* \n */ | |
276 | ||
a0055ae2 | 277 | len = hex2u64(line, &start); |
a2928c42 ACM |
278 | |
279 | len++; | |
280 | if (len + 2 >= line_len) | |
281 | continue; | |
282 | ||
283 | symbol_type = toupper(line[len]); | |
284 | /* | |
285 | * We're interested only in code ('T'ext) | |
286 | */ | |
287 | if (symbol_type != 'T' && symbol_type != 'W') | |
288 | continue; | |
af427bf5 ACM |
289 | |
290 | symbol_name = line + len + 2; | |
2e538c4a ACM |
291 | /* |
292 | * Will fix up the end later, when we have all symbols sorted. | |
293 | */ | |
00a192b3 | 294 | sym = symbol__new(start, 0, symbol_name); |
af427bf5 | 295 | |
2e538c4a ACM |
296 | if (sym == NULL) |
297 | goto out_delete_line; | |
298 | ||
82164161 ACM |
299 | /* |
300 | * We will pass the symbols to the filter later, in | |
301 | * kernel_maps__split_kallsyms, when we have split the | |
302 | * maps per module | |
303 | */ | |
2e538c4a ACM |
304 | dso__insert_symbol(kernel_map->dso, sym); |
305 | } | |
306 | ||
307 | free(line); | |
308 | fclose(file); | |
309 | ||
310 | return 0; | |
311 | ||
312 | out_delete_line: | |
313 | free(line); | |
314 | out_failure: | |
315 | return -1; | |
316 | } | |
317 | ||
318 | /* | |
319 | * Split the symbols into maps, making sure there are no overlaps, i.e. the | |
320 | * kernel range is broken in several maps, named [kernel].N, as we don't have | |
321 | * the original ELF section names vmlinux have. | |
322 | */ | |
c338aee8 | 323 | static int kernel_maps__split_kallsyms(symbol_filter_t filter) |
2e538c4a ACM |
324 | { |
325 | struct map *map = kernel_map; | |
326 | struct symbol *pos; | |
327 | int count = 0; | |
328 | struct rb_node *next = rb_first(&kernel_map->dso->syms); | |
329 | int kernel_range = 0; | |
330 | ||
331 | while (next) { | |
332 | char *module; | |
333 | ||
334 | pos = rb_entry(next, struct symbol, rb_node); | |
335 | next = rb_next(&pos->rb_node); | |
336 | ||
337 | module = strchr(pos->name, '\t'); | |
338 | if (module) { | |
2e538c4a ACM |
339 | *module++ = '\0'; |
340 | ||
af427bf5 ACM |
341 | if (strcmp(map->dso->name, module)) { |
342 | map = kernel_maps__find_by_dso_name(module); | |
343 | if (!map) { | |
6beba7ad ACM |
344 | pr_err("/proc/{kallsyms,modules} " |
345 | "inconsistency!\n"); | |
af427bf5 ACM |
346 | return -1; |
347 | } | |
348 | } | |
2e538c4a ACM |
349 | /* |
350 | * So that we look just like we get from .ko files, | |
351 | * i.e. not prelinked, relative to map->start. | |
352 | */ | |
353 | pos->start = map->map_ip(map, pos->start); | |
354 | pos->end = map->map_ip(map, pos->end); | |
355 | } else if (map != kernel_map) { | |
356 | char dso_name[PATH_MAX]; | |
357 | struct dso *dso; | |
358 | ||
359 | snprintf(dso_name, sizeof(dso_name), "[kernel].%d", | |
360 | kernel_range++); | |
361 | ||
00a192b3 | 362 | dso = dso__new(dso_name); |
2e538c4a ACM |
363 | if (dso == NULL) |
364 | return -1; | |
365 | ||
366 | map = map__new2(pos->start, dso); | |
367 | if (map == NULL) { | |
368 | dso__delete(dso); | |
369 | return -1; | |
370 | } | |
a2928c42 | 371 | |
ed52ce2e | 372 | map->map_ip = map->unmap_ip = identity__map_ip; |
2e538c4a ACM |
373 | kernel_maps__insert(map); |
374 | ++kernel_range; | |
375 | } | |
a2928c42 | 376 | |
2e538c4a | 377 | if (filter && filter(map, pos)) { |
2e538c4a | 378 | rb_erase(&pos->rb_node, &kernel_map->dso->syms); |
00a192b3 | 379 | symbol__delete(pos); |
2e538c4a ACM |
380 | } else { |
381 | if (map != kernel_map) { | |
382 | rb_erase(&pos->rb_node, &kernel_map->dso->syms); | |
383 | dso__insert_symbol(map->dso, pos); | |
384 | } | |
9974f496 MG |
385 | count++; |
386 | } | |
a2928c42 ACM |
387 | } |
388 | ||
9974f496 | 389 | return count; |
2e538c4a | 390 | } |
a2928c42 | 391 | |
2e538c4a | 392 | |
c338aee8 | 393 | static int kernel_maps__load_kallsyms(symbol_filter_t filter) |
2e538c4a | 394 | { |
6beba7ad | 395 | if (kernel_maps__load_all_kallsyms()) |
2e538c4a ACM |
396 | return -1; |
397 | ||
398 | dso__fixup_sym_end(kernel_map->dso); | |
c338aee8 | 399 | kernel_map->dso->origin = DSO__ORIG_KERNEL; |
2e538c4a | 400 | |
c338aee8 | 401 | return kernel_maps__split_kallsyms(filter); |
a2928c42 ACM |
402 | } |
403 | ||
c338aee8 | 404 | size_t kernel_maps__fprintf(FILE *fp) |
af427bf5 | 405 | { |
6beba7ad | 406 | size_t printed = fprintf(fp, "Kernel maps:\n"); |
af427bf5 ACM |
407 | struct rb_node *nd; |
408 | ||
af427bf5 ACM |
409 | for (nd = rb_first(&kernel_maps); nd; nd = rb_next(nd)) { |
410 | struct map *pos = rb_entry(nd, struct map, rb_node); | |
411 | ||
2e538c4a | 412 | printed += fprintf(fp, "Map:"); |
af427bf5 | 413 | printed += map__fprintf(pos, fp); |
6beba7ad | 414 | if (verbose > 1) { |
2e538c4a ACM |
415 | printed += dso__fprintf(pos->dso, fp); |
416 | printed += fprintf(fp, "--\n"); | |
417 | } | |
af427bf5 ACM |
418 | } |
419 | ||
6beba7ad | 420 | return printed + fprintf(fp, "END kernel maps\n"); |
af427bf5 ACM |
421 | } |
422 | ||
439d473b | 423 | static int dso__load_perf_map(struct dso *self, struct map *map, |
6beba7ad | 424 | symbol_filter_t filter) |
80d496be PE |
425 | { |
426 | char *line = NULL; | |
427 | size_t n; | |
428 | FILE *file; | |
429 | int nr_syms = 0; | |
430 | ||
439d473b | 431 | file = fopen(self->long_name, "r"); |
80d496be PE |
432 | if (file == NULL) |
433 | goto out_failure; | |
434 | ||
435 | while (!feof(file)) { | |
9cffa8d5 | 436 | u64 start, size; |
80d496be PE |
437 | struct symbol *sym; |
438 | int line_len, len; | |
439 | ||
440 | line_len = getline(&line, &n, file); | |
441 | if (line_len < 0) | |
442 | break; | |
443 | ||
444 | if (!line) | |
445 | goto out_failure; | |
446 | ||
447 | line[--line_len] = '\0'; /* \n */ | |
448 | ||
449 | len = hex2u64(line, &start); | |
450 | ||
451 | len++; | |
452 | if (len + 2 >= line_len) | |
453 | continue; | |
454 | ||
455 | len += hex2u64(line + len, &size); | |
456 | ||
457 | len++; | |
458 | if (len + 2 >= line_len) | |
459 | continue; | |
460 | ||
00a192b3 | 461 | sym = symbol__new(start, size, line + len); |
80d496be PE |
462 | |
463 | if (sym == NULL) | |
464 | goto out_delete_line; | |
465 | ||
439d473b | 466 | if (filter && filter(map, sym)) |
00a192b3 | 467 | symbol__delete(sym); |
80d496be PE |
468 | else { |
469 | dso__insert_symbol(self, sym); | |
470 | nr_syms++; | |
471 | } | |
472 | } | |
473 | ||
474 | free(line); | |
475 | fclose(file); | |
476 | ||
477 | return nr_syms; | |
478 | ||
479 | out_delete_line: | |
480 | free(line); | |
481 | out_failure: | |
482 | return -1; | |
483 | } | |
484 | ||
a2928c42 ACM |
485 | /** |
486 | * elf_symtab__for_each_symbol - iterate thru all the symbols | |
487 | * | |
488 | * @self: struct elf_symtab instance to iterate | |
83a0944f | 489 | * @idx: uint32_t idx |
a2928c42 ACM |
490 | * @sym: GElf_Sym iterator |
491 | */ | |
83a0944f IM |
492 | #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ |
493 | for (idx = 0, gelf_getsym(syms, idx, &sym);\ | |
494 | idx < nr_syms; \ | |
495 | idx++, gelf_getsym(syms, idx, &sym)) | |
a2928c42 ACM |
496 | |
497 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) | |
498 | { | |
499 | return GELF_ST_TYPE(sym->st_info); | |
500 | } | |
501 | ||
502 | static inline int elf_sym__is_function(const GElf_Sym *sym) | |
503 | { | |
504 | return elf_sym__type(sym) == STT_FUNC && | |
505 | sym->st_name != 0 && | |
81833130 | 506 | sym->st_shndx != SHN_UNDEF; |
a2928c42 ACM |
507 | } |
508 | ||
6cfcc53e MG |
509 | static inline int elf_sym__is_label(const GElf_Sym *sym) |
510 | { | |
511 | return elf_sym__type(sym) == STT_NOTYPE && | |
512 | sym->st_name != 0 && | |
513 | sym->st_shndx != SHN_UNDEF && | |
514 | sym->st_shndx != SHN_ABS; | |
515 | } | |
516 | ||
517 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, | |
518 | const Elf_Data *secstrs) | |
519 | { | |
520 | return secstrs->d_buf + shdr->sh_name; | |
521 | } | |
522 | ||
523 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, | |
524 | const Elf_Data *secstrs) | |
525 | { | |
526 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; | |
527 | } | |
528 | ||
a2928c42 ACM |
529 | static inline const char *elf_sym__name(const GElf_Sym *sym, |
530 | const Elf_Data *symstrs) | |
531 | { | |
532 | return symstrs->d_buf + sym->st_name; | |
533 | } | |
534 | ||
535 | static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, | |
536 | GElf_Shdr *shp, const char *name, | |
83a0944f | 537 | size_t *idx) |
a2928c42 ACM |
538 | { |
539 | Elf_Scn *sec = NULL; | |
540 | size_t cnt = 1; | |
541 | ||
542 | while ((sec = elf_nextscn(elf, sec)) != NULL) { | |
543 | char *str; | |
544 | ||
545 | gelf_getshdr(sec, shp); | |
546 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); | |
547 | if (!strcmp(name, str)) { | |
83a0944f IM |
548 | if (idx) |
549 | *idx = cnt; | |
a2928c42 ACM |
550 | break; |
551 | } | |
552 | ++cnt; | |
553 | } | |
554 | ||
555 | return sec; | |
556 | } | |
557 | ||
8ce998d6 ACM |
558 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ |
559 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ | |
560 | idx < nr_entries; \ | |
561 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) | |
562 | ||
563 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ | |
564 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ | |
565 | idx < nr_entries; \ | |
566 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) | |
567 | ||
a25e46c4 ACM |
568 | /* |
569 | * We need to check if we have a .dynsym, so that we can handle the | |
570 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it | |
571 | * .dynsym or .symtab). | |
572 | * And always look at the original dso, not at debuginfo packages, that | |
573 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). | |
574 | */ | |
82164161 ACM |
575 | static int dso__synthesize_plt_symbols(struct dso *self, struct map *map, |
576 | symbol_filter_t filter) | |
8ce998d6 ACM |
577 | { |
578 | uint32_t nr_rel_entries, idx; | |
579 | GElf_Sym sym; | |
9cffa8d5 | 580 | u64 plt_offset; |
8ce998d6 ACM |
581 | GElf_Shdr shdr_plt; |
582 | struct symbol *f; | |
a25e46c4 | 583 | GElf_Shdr shdr_rel_plt, shdr_dynsym; |
8ce998d6 | 584 | Elf_Data *reldata, *syms, *symstrs; |
a25e46c4 ACM |
585 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; |
586 | size_t dynsym_idx; | |
587 | GElf_Ehdr ehdr; | |
8ce998d6 | 588 | char sympltname[1024]; |
a25e46c4 ACM |
589 | Elf *elf; |
590 | int nr = 0, symidx, fd, err = 0; | |
591 | ||
439d473b | 592 | fd = open(self->long_name, O_RDONLY); |
a25e46c4 ACM |
593 | if (fd < 0) |
594 | goto out; | |
595 | ||
84087126 | 596 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
a25e46c4 ACM |
597 | if (elf == NULL) |
598 | goto out_close; | |
599 | ||
600 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
601 | goto out_elf_end; | |
602 | ||
603 | scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym, | |
604 | ".dynsym", &dynsym_idx); | |
605 | if (scn_dynsym == NULL) | |
606 | goto out_elf_end; | |
8ce998d6 | 607 | |
a25e46c4 | 608 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
8ce998d6 ACM |
609 | ".rela.plt", NULL); |
610 | if (scn_plt_rel == NULL) { | |
a25e46c4 | 611 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
8ce998d6 ACM |
612 | ".rel.plt", NULL); |
613 | if (scn_plt_rel == NULL) | |
a25e46c4 | 614 | goto out_elf_end; |
8ce998d6 ACM |
615 | } |
616 | ||
a25e46c4 ACM |
617 | err = -1; |
618 | ||
8ce998d6 | 619 | if (shdr_rel_plt.sh_link != dynsym_idx) |
a25e46c4 | 620 | goto out_elf_end; |
8ce998d6 | 621 | |
a25e46c4 ACM |
622 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) |
623 | goto out_elf_end; | |
8ce998d6 ACM |
624 | |
625 | /* | |
83a0944f | 626 | * Fetch the relocation section to find the idxes to the GOT |
8ce998d6 ACM |
627 | * and the symbols in the .dynsym they refer to. |
628 | */ | |
629 | reldata = elf_getdata(scn_plt_rel, NULL); | |
630 | if (reldata == NULL) | |
a25e46c4 | 631 | goto out_elf_end; |
8ce998d6 ACM |
632 | |
633 | syms = elf_getdata(scn_dynsym, NULL); | |
634 | if (syms == NULL) | |
a25e46c4 | 635 | goto out_elf_end; |
8ce998d6 | 636 | |
a25e46c4 | 637 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); |
8ce998d6 | 638 | if (scn_symstrs == NULL) |
a25e46c4 | 639 | goto out_elf_end; |
8ce998d6 ACM |
640 | |
641 | symstrs = elf_getdata(scn_symstrs, NULL); | |
642 | if (symstrs == NULL) | |
a25e46c4 | 643 | goto out_elf_end; |
8ce998d6 ACM |
644 | |
645 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; | |
646 | plt_offset = shdr_plt.sh_offset; | |
647 | ||
648 | if (shdr_rel_plt.sh_type == SHT_RELA) { | |
649 | GElf_Rela pos_mem, *pos; | |
650 | ||
651 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, | |
652 | nr_rel_entries) { | |
653 | symidx = GELF_R_SYM(pos->r_info); | |
654 | plt_offset += shdr_plt.sh_entsize; | |
655 | gelf_getsym(syms, symidx, &sym); | |
656 | snprintf(sympltname, sizeof(sympltname), | |
657 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
658 | ||
659 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
00a192b3 | 660 | sympltname); |
8ce998d6 | 661 | if (!f) |
a25e46c4 | 662 | goto out_elf_end; |
8ce998d6 | 663 | |
82164161 ACM |
664 | if (filter && filter(map, f)) |
665 | symbol__delete(f); | |
666 | else { | |
667 | dso__insert_symbol(self, f); | |
668 | ++nr; | |
669 | } | |
8ce998d6 ACM |
670 | } |
671 | } else if (shdr_rel_plt.sh_type == SHT_REL) { | |
672 | GElf_Rel pos_mem, *pos; | |
673 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, | |
674 | nr_rel_entries) { | |
675 | symidx = GELF_R_SYM(pos->r_info); | |
676 | plt_offset += shdr_plt.sh_entsize; | |
677 | gelf_getsym(syms, symidx, &sym); | |
678 | snprintf(sympltname, sizeof(sympltname), | |
679 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
680 | ||
681 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
00a192b3 | 682 | sympltname); |
8ce998d6 | 683 | if (!f) |
a25e46c4 | 684 | goto out_elf_end; |
8ce998d6 | 685 | |
82164161 ACM |
686 | if (filter && filter(map, f)) |
687 | symbol__delete(f); | |
688 | else { | |
689 | dso__insert_symbol(self, f); | |
690 | ++nr; | |
691 | } | |
8ce998d6 | 692 | } |
8ce998d6 ACM |
693 | } |
694 | ||
a25e46c4 ACM |
695 | err = 0; |
696 | out_elf_end: | |
697 | elf_end(elf); | |
698 | out_close: | |
699 | close(fd); | |
700 | ||
701 | if (err == 0) | |
702 | return nr; | |
703 | out: | |
6beba7ad ACM |
704 | pr_warning("%s: problems reading %s PLT info.\n", |
705 | __func__, self->long_name); | |
a25e46c4 | 706 | return 0; |
8ce998d6 ACM |
707 | } |
708 | ||
439d473b ACM |
709 | static int dso__load_sym(struct dso *self, struct map *map, const char *name, |
710 | int fd, symbol_filter_t filter, int kernel, | |
6beba7ad | 711 | int kmodule) |
a2928c42 | 712 | { |
2e538c4a ACM |
713 | struct map *curr_map = map; |
714 | struct dso *curr_dso = self; | |
715 | size_t dso_name_len = strlen(self->short_name); | |
6cfcc53e | 716 | Elf_Data *symstrs, *secstrs; |
a2928c42 ACM |
717 | uint32_t nr_syms; |
718 | int err = -1; | |
83a0944f | 719 | uint32_t idx; |
a2928c42 ACM |
720 | GElf_Ehdr ehdr; |
721 | GElf_Shdr shdr; | |
722 | Elf_Data *syms; | |
723 | GElf_Sym sym; | |
a25e46c4 | 724 | Elf_Scn *sec, *sec_strndx; |
a2928c42 | 725 | Elf *elf; |
439d473b | 726 | int nr = 0; |
a2928c42 | 727 | |
84087126 | 728 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
a2928c42 | 729 | if (elf == NULL) { |
6beba7ad | 730 | pr_err("%s: cannot read %s ELF file.\n", __func__, name); |
a2928c42 ACM |
731 | goto out_close; |
732 | } | |
733 | ||
734 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
6beba7ad | 735 | pr_err("%s: cannot get elf header.\n", __func__); |
a2928c42 ACM |
736 | goto out_elf_end; |
737 | } | |
738 | ||
739 | sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL); | |
8ce998d6 | 740 | if (sec == NULL) { |
a25e46c4 ACM |
741 | sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL); |
742 | if (sec == NULL) | |
8ce998d6 | 743 | goto out_elf_end; |
8ce998d6 | 744 | } |
a2928c42 ACM |
745 | |
746 | syms = elf_getdata(sec, NULL); | |
747 | if (syms == NULL) | |
748 | goto out_elf_end; | |
749 | ||
750 | sec = elf_getscn(elf, shdr.sh_link); | |
751 | if (sec == NULL) | |
752 | goto out_elf_end; | |
753 | ||
754 | symstrs = elf_getdata(sec, NULL); | |
755 | if (symstrs == NULL) | |
756 | goto out_elf_end; | |
757 | ||
6cfcc53e MG |
758 | sec_strndx = elf_getscn(elf, ehdr.e_shstrndx); |
759 | if (sec_strndx == NULL) | |
760 | goto out_elf_end; | |
761 | ||
762 | secstrs = elf_getdata(sec_strndx, NULL); | |
9b30a26b | 763 | if (secstrs == NULL) |
6cfcc53e MG |
764 | goto out_elf_end; |
765 | ||
a2928c42 ACM |
766 | nr_syms = shdr.sh_size / shdr.sh_entsize; |
767 | ||
e9fbc9dc | 768 | memset(&sym, 0, sizeof(sym)); |
d20ff6bd MG |
769 | if (!kernel) { |
770 | self->adjust_symbols = (ehdr.e_type == ET_EXEC || | |
30d7a77d ACM |
771 | elf_section_by_name(elf, &ehdr, &shdr, |
772 | ".gnu.prelink_undo", | |
773 | NULL) != NULL); | |
d20ff6bd MG |
774 | } else self->adjust_symbols = 0; |
775 | ||
83a0944f | 776 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
a2928c42 | 777 | struct symbol *f; |
83a0944f | 778 | const char *elf_name; |
2e538c4a | 779 | char *demangled = NULL; |
6cfcc53e MG |
780 | int is_label = elf_sym__is_label(&sym); |
781 | const char *section_name; | |
a2928c42 | 782 | |
6cfcc53e | 783 | if (!is_label && !elf_sym__is_function(&sym)) |
a2928c42 ACM |
784 | continue; |
785 | ||
786 | sec = elf_getscn(elf, sym.st_shndx); | |
787 | if (!sec) | |
788 | goto out_elf_end; | |
789 | ||
790 | gelf_getshdr(sec, &shdr); | |
6cfcc53e MG |
791 | |
792 | if (is_label && !elf_sec__is_text(&shdr, secstrs)) | |
793 | continue; | |
794 | ||
2e538c4a | 795 | elf_name = elf_sym__name(&sym, symstrs); |
6cfcc53e | 796 | section_name = elf_sec__name(&shdr, secstrs); |
0b73da3f | 797 | |
2e538c4a ACM |
798 | if (kernel || kmodule) { |
799 | char dso_name[PATH_MAX]; | |
800 | ||
801 | if (strcmp(section_name, | |
802 | curr_dso->short_name + dso_name_len) == 0) | |
803 | goto new_symbol; | |
804 | ||
805 | if (strcmp(section_name, ".text") == 0) { | |
806 | curr_map = map; | |
807 | curr_dso = self; | |
808 | goto new_symbol; | |
809 | } | |
810 | ||
811 | snprintf(dso_name, sizeof(dso_name), | |
812 | "%s%s", self->short_name, section_name); | |
813 | ||
814 | curr_map = kernel_maps__find_by_dso_name(dso_name); | |
815 | if (curr_map == NULL) { | |
816 | u64 start = sym.st_value; | |
817 | ||
818 | if (kmodule) | |
819 | start += map->start + shdr.sh_offset; | |
820 | ||
00a192b3 | 821 | curr_dso = dso__new(dso_name); |
2e538c4a ACM |
822 | if (curr_dso == NULL) |
823 | goto out_elf_end; | |
824 | curr_map = map__new2(start, curr_dso); | |
825 | if (curr_map == NULL) { | |
826 | dso__delete(curr_dso); | |
827 | goto out_elf_end; | |
828 | } | |
ed52ce2e ACM |
829 | curr_map->map_ip = identity__map_ip; |
830 | curr_map->unmap_ip = identity__map_ip; | |
2e538c4a ACM |
831 | curr_dso->origin = DSO__ORIG_KERNEL; |
832 | kernel_maps__insert(curr_map); | |
833 | dsos__add(curr_dso); | |
834 | } else | |
835 | curr_dso = curr_map->dso; | |
836 | ||
837 | goto new_symbol; | |
af427bf5 ACM |
838 | } |
839 | ||
2e538c4a | 840 | if (curr_dso->adjust_symbols) { |
6beba7ad ACM |
841 | pr_debug2("adjusting symbol: st_value: %Lx sh_addr: " |
842 | "%Lx sh_offset: %Lx\n", (u64)sym.st_value, | |
843 | (u64)shdr.sh_addr, (u64)shdr.sh_offset); | |
f5812a7a | 844 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; |
af427bf5 | 845 | } |
28ac909b ACM |
846 | /* |
847 | * We need to figure out if the object was created from C++ sources | |
848 | * DWARF DW_compile_unit has this, but we don't always have access | |
849 | * to it... | |
850 | */ | |
83a0944f | 851 | demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI); |
28ac909b | 852 | if (demangled != NULL) |
83a0944f | 853 | elf_name = demangled; |
2e538c4a | 854 | new_symbol: |
00a192b3 | 855 | f = symbol__new(sym.st_value, sym.st_size, elf_name); |
28ac909b | 856 | free(demangled); |
a2928c42 ACM |
857 | if (!f) |
858 | goto out_elf_end; | |
859 | ||
2e538c4a | 860 | if (filter && filter(curr_map, f)) |
00a192b3 | 861 | symbol__delete(f); |
69ee69f6 | 862 | else { |
2e538c4a | 863 | dso__insert_symbol(curr_dso, f); |
69ee69f6 ACM |
864 | nr++; |
865 | } | |
a2928c42 ACM |
866 | } |
867 | ||
2e538c4a ACM |
868 | /* |
869 | * For misannotated, zeroed, ASM function sizes. | |
870 | */ | |
871 | if (nr > 0) | |
872 | dso__fixup_sym_end(self); | |
a2928c42 ACM |
873 | err = nr; |
874 | out_elf_end: | |
875 | elf_end(elf); | |
876 | out_close: | |
877 | return err; | |
878 | } | |
879 | ||
78075caa ACM |
880 | static bool dso__build_id_equal(const struct dso *self, u8 *build_id) |
881 | { | |
882 | return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0; | |
883 | } | |
884 | ||
e30a3d12 | 885 | bool dsos__read_build_ids(void) |
57f395a7 | 886 | { |
e30a3d12 | 887 | bool have_build_id = false; |
57f395a7 FW |
888 | struct dso *pos; |
889 | ||
e30a3d12 ACM |
890 | list_for_each_entry(pos, &dsos, node) |
891 | if (filename__read_build_id(pos->long_name, pos->build_id, | |
892 | sizeof(pos->build_id)) > 0) { | |
893 | have_build_id = true; | |
894 | pos->has_build_id = true; | |
895 | } | |
57f395a7 | 896 | |
e30a3d12 | 897 | return have_build_id; |
57f395a7 FW |
898 | } |
899 | ||
fd7a346e ACM |
900 | /* |
901 | * Align offset to 4 bytes as needed for note name and descriptor data. | |
902 | */ | |
903 | #define NOTE_ALIGN(n) (((n) + 3) & -4U) | |
904 | ||
2643ce11 | 905 | int filename__read_build_id(const char *filename, void *bf, size_t size) |
4d1e00a8 | 906 | { |
2643ce11 | 907 | int fd, err = -1; |
4d1e00a8 ACM |
908 | GElf_Ehdr ehdr; |
909 | GElf_Shdr shdr; | |
fd7a346e | 910 | Elf_Data *data; |
4d1e00a8 | 911 | Elf_Scn *sec; |
fd7a346e | 912 | void *ptr; |
4d1e00a8 | 913 | Elf *elf; |
4d1e00a8 | 914 | |
2643ce11 ACM |
915 | if (size < BUILD_ID_SIZE) |
916 | goto out; | |
917 | ||
918 | fd = open(filename, O_RDONLY); | |
4d1e00a8 ACM |
919 | if (fd < 0) |
920 | goto out; | |
921 | ||
84087126 | 922 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
4d1e00a8 | 923 | if (elf == NULL) { |
8d06367f | 924 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); |
4d1e00a8 ACM |
925 | goto out_close; |
926 | } | |
927 | ||
928 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
6beba7ad | 929 | pr_err("%s: cannot get elf header.\n", __func__); |
4d1e00a8 ACM |
930 | goto out_elf_end; |
931 | } | |
932 | ||
2643ce11 ACM |
933 | sec = elf_section_by_name(elf, &ehdr, &shdr, |
934 | ".note.gnu.build-id", NULL); | |
fd7a346e ACM |
935 | if (sec == NULL) { |
936 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
937 | ".notes", NULL); | |
938 | if (sec == NULL) | |
939 | goto out_elf_end; | |
940 | } | |
4d1e00a8 | 941 | |
fd7a346e ACM |
942 | data = elf_getdata(sec, NULL); |
943 | if (data == NULL) | |
4d1e00a8 | 944 | goto out_elf_end; |
fd7a346e ACM |
945 | |
946 | ptr = data->d_buf; | |
947 | while (ptr < (data->d_buf + data->d_size)) { | |
948 | GElf_Nhdr *nhdr = ptr; | |
949 | int namesz = NOTE_ALIGN(nhdr->n_namesz), | |
950 | descsz = NOTE_ALIGN(nhdr->n_descsz); | |
951 | const char *name; | |
952 | ||
953 | ptr += sizeof(*nhdr); | |
954 | name = ptr; | |
955 | ptr += namesz; | |
956 | if (nhdr->n_type == NT_GNU_BUILD_ID && | |
957 | nhdr->n_namesz == sizeof("GNU")) { | |
958 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { | |
959 | memcpy(bf, ptr, BUILD_ID_SIZE); | |
960 | err = BUILD_ID_SIZE; | |
961 | break; | |
962 | } | |
963 | } | |
964 | ptr += descsz; | |
965 | } | |
2643ce11 ACM |
966 | out_elf_end: |
967 | elf_end(elf); | |
968 | out_close: | |
969 | close(fd); | |
970 | out: | |
971 | return err; | |
972 | } | |
973 | ||
f1617b40 ACM |
974 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) |
975 | { | |
976 | int fd, err = -1; | |
977 | ||
978 | if (size < BUILD_ID_SIZE) | |
979 | goto out; | |
980 | ||
981 | fd = open(filename, O_RDONLY); | |
982 | if (fd < 0) | |
983 | goto out; | |
984 | ||
985 | while (1) { | |
986 | char bf[BUFSIZ]; | |
987 | GElf_Nhdr nhdr; | |
988 | int namesz, descsz; | |
989 | ||
990 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) | |
991 | break; | |
992 | ||
fd7a346e ACM |
993 | namesz = NOTE_ALIGN(nhdr.n_namesz); |
994 | descsz = NOTE_ALIGN(nhdr.n_descsz); | |
f1617b40 ACM |
995 | if (nhdr.n_type == NT_GNU_BUILD_ID && |
996 | nhdr.n_namesz == sizeof("GNU")) { | |
997 | if (read(fd, bf, namesz) != namesz) | |
998 | break; | |
999 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { | |
1000 | if (read(fd, build_id, | |
1001 | BUILD_ID_SIZE) == BUILD_ID_SIZE) { | |
1002 | err = 0; | |
1003 | break; | |
1004 | } | |
1005 | } else if (read(fd, bf, descsz) != descsz) | |
1006 | break; | |
1007 | } else { | |
1008 | int n = namesz + descsz; | |
1009 | if (read(fd, bf, n) != n) | |
1010 | break; | |
1011 | } | |
1012 | } | |
1013 | close(fd); | |
1014 | out: | |
1015 | return err; | |
1016 | } | |
1017 | ||
94cb9e38 ACM |
1018 | char dso__symtab_origin(const struct dso *self) |
1019 | { | |
1020 | static const char origin[] = { | |
1021 | [DSO__ORIG_KERNEL] = 'k', | |
1022 | [DSO__ORIG_JAVA_JIT] = 'j', | |
1023 | [DSO__ORIG_FEDORA] = 'f', | |
1024 | [DSO__ORIG_UBUNTU] = 'u', | |
1025 | [DSO__ORIG_BUILDID] = 'b', | |
1026 | [DSO__ORIG_DSO] = 'd', | |
439d473b | 1027 | [DSO__ORIG_KMODULE] = 'K', |
94cb9e38 ACM |
1028 | }; |
1029 | ||
1030 | if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND) | |
1031 | return '!'; | |
1032 | return origin[self->origin]; | |
1033 | } | |
1034 | ||
6beba7ad | 1035 | int dso__load(struct dso *self, struct map *map, symbol_filter_t filter) |
a2928c42 | 1036 | { |
4d1e00a8 | 1037 | int size = PATH_MAX; |
c338aee8 | 1038 | char *name; |
d3379ab9 | 1039 | u8 build_id[BUILD_ID_SIZE]; |
a2928c42 ACM |
1040 | int ret = -1; |
1041 | int fd; | |
1042 | ||
8d06367f | 1043 | self->loaded = 1; |
66bd8424 | 1044 | |
c338aee8 ACM |
1045 | if (self->kernel) |
1046 | return dso__load_kernel_sym(self, map, filter); | |
1047 | ||
1048 | name = malloc(size); | |
a2928c42 ACM |
1049 | if (!name) |
1050 | return -1; | |
1051 | ||
30d7a77d | 1052 | self->adjust_symbols = 0; |
f5812a7a | 1053 | |
94cb9e38 | 1054 | if (strncmp(self->name, "/tmp/perf-", 10) == 0) { |
6beba7ad | 1055 | ret = dso__load_perf_map(self, map, filter); |
94cb9e38 ACM |
1056 | self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT : |
1057 | DSO__ORIG_NOT_FOUND; | |
1058 | return ret; | |
1059 | } | |
1060 | ||
1061 | self->origin = DSO__ORIG_FEDORA - 1; | |
80d496be | 1062 | |
a2928c42 ACM |
1063 | more: |
1064 | do { | |
94cb9e38 ACM |
1065 | self->origin++; |
1066 | switch (self->origin) { | |
1067 | case DSO__ORIG_FEDORA: | |
439d473b ACM |
1068 | snprintf(name, size, "/usr/lib/debug%s.debug", |
1069 | self->long_name); | |
a2928c42 | 1070 | break; |
94cb9e38 | 1071 | case DSO__ORIG_UBUNTU: |
439d473b ACM |
1072 | snprintf(name, size, "/usr/lib/debug%s", |
1073 | self->long_name); | |
a2928c42 | 1074 | break; |
94cb9e38 | 1075 | case DSO__ORIG_BUILDID: |
d3379ab9 ACM |
1076 | if (filename__read_build_id(self->long_name, build_id, |
1077 | sizeof(build_id))) { | |
1078 | char build_id_hex[BUILD_ID_SIZE * 2 + 1]; | |
1079 | ||
1080 | build_id__sprintf(build_id, sizeof(build_id), | |
1081 | build_id_hex); | |
4d1e00a8 ACM |
1082 | snprintf(name, size, |
1083 | "/usr/lib/debug/.build-id/%.2s/%s.debug", | |
d3379ab9 ACM |
1084 | build_id_hex, build_id_hex + 2); |
1085 | if (self->has_build_id) | |
1086 | goto compare_build_id; | |
1087 | break; | |
4d1e00a8 | 1088 | } |
94cb9e38 | 1089 | self->origin++; |
4d1e00a8 | 1090 | /* Fall thru */ |
94cb9e38 | 1091 | case DSO__ORIG_DSO: |
439d473b | 1092 | snprintf(name, size, "%s", self->long_name); |
a2928c42 ACM |
1093 | break; |
1094 | ||
1095 | default: | |
1096 | goto out; | |
1097 | } | |
a2928c42 | 1098 | |
8d06367f | 1099 | if (self->has_build_id) { |
d3379ab9 ACM |
1100 | if (filename__read_build_id(name, build_id, |
1101 | sizeof(build_id)) < 0) | |
8d06367f | 1102 | goto more; |
8d06367f | 1103 | compare_build_id: |
78075caa | 1104 | if (!dso__build_id_equal(self, build_id)) |
8d06367f ACM |
1105 | goto more; |
1106 | } | |
1107 | ||
a2928c42 ACM |
1108 | fd = open(name, O_RDONLY); |
1109 | } while (fd < 0); | |
1110 | ||
6beba7ad | 1111 | ret = dso__load_sym(self, map, name, fd, filter, 0, 0); |
a2928c42 ACM |
1112 | close(fd); |
1113 | ||
1114 | /* | |
1115 | * Some people seem to have debuginfo files _WITHOUT_ debug info!?!? | |
1116 | */ | |
1117 | if (!ret) | |
1118 | goto more; | |
1119 | ||
a25e46c4 | 1120 | if (ret > 0) { |
82164161 | 1121 | int nr_plt = dso__synthesize_plt_symbols(self, map, filter); |
a25e46c4 ACM |
1122 | if (nr_plt > 0) |
1123 | ret += nr_plt; | |
1124 | } | |
a2928c42 ACM |
1125 | out: |
1126 | free(name); | |
1340e6bb ACM |
1127 | if (ret < 0 && strstr(self->name, " (deleted)") != NULL) |
1128 | return 0; | |
a2928c42 ACM |
1129 | return ret; |
1130 | } | |
1131 | ||
439d473b ACM |
1132 | struct map *kernel_map; |
1133 | ||
1134 | static void kernel_maps__insert(struct map *map) | |
6cfcc53e | 1135 | { |
439d473b ACM |
1136 | maps__insert(&kernel_maps, map); |
1137 | } | |
6cfcc53e | 1138 | |
c338aee8 ACM |
1139 | struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp, |
1140 | symbol_filter_t filter) | |
439d473b | 1141 | { |
439d473b | 1142 | struct map *map = maps__find(&kernel_maps, ip); |
2e538c4a ACM |
1143 | |
1144 | if (mapp) | |
1145 | *mapp = map; | |
439d473b ACM |
1146 | |
1147 | if (map) { | |
1148 | ip = map->map_ip(map, ip); | |
c338aee8 | 1149 | return map__find_symbol(map, ip, filter); |
439d473b | 1150 | } |
6cfcc53e | 1151 | |
2e538c4a | 1152 | return NULL; |
439d473b ACM |
1153 | } |
1154 | ||
1155 | struct map *kernel_maps__find_by_dso_name(const char *name) | |
1156 | { | |
1157 | struct rb_node *nd; | |
1158 | ||
1159 | for (nd = rb_first(&kernel_maps); nd; nd = rb_next(nd)) { | |
1160 | struct map *map = rb_entry(nd, struct map, rb_node); | |
1161 | ||
1162 | if (map->dso && strcmp(map->dso->name, name) == 0) | |
1163 | return map; | |
1164 | } | |
1165 | ||
1166 | return NULL; | |
1167 | } | |
1168 | ||
c338aee8 | 1169 | static int dsos__set_modules_path_dir(char *dirname) |
6cfcc53e | 1170 | { |
439d473b | 1171 | struct dirent *dent; |
439d473b | 1172 | DIR *dir = opendir(dirname); |
6cfcc53e | 1173 | |
439d473b | 1174 | if (!dir) { |
6beba7ad | 1175 | pr_err("%s: cannot open %s dir\n", __func__, dirname); |
439d473b ACM |
1176 | return -1; |
1177 | } | |
6cfcc53e | 1178 | |
439d473b ACM |
1179 | while ((dent = readdir(dir)) != NULL) { |
1180 | char path[PATH_MAX]; | |
1181 | ||
1182 | if (dent->d_type == DT_DIR) { | |
1183 | if (!strcmp(dent->d_name, ".") || | |
1184 | !strcmp(dent->d_name, "..")) | |
1185 | continue; | |
1186 | ||
1187 | snprintf(path, sizeof(path), "%s/%s", | |
1188 | dirname, dent->d_name); | |
c338aee8 | 1189 | if (dsos__set_modules_path_dir(path) < 0) |
439d473b ACM |
1190 | goto failure; |
1191 | } else { | |
1192 | char *dot = strrchr(dent->d_name, '.'), | |
1193 | dso_name[PATH_MAX]; | |
1194 | struct map *map; | |
cfc10d3b | 1195 | char *long_name; |
439d473b ACM |
1196 | |
1197 | if (dot == NULL || strcmp(dot, ".ko")) | |
1198 | continue; | |
1199 | snprintf(dso_name, sizeof(dso_name), "[%.*s]", | |
1200 | (int)(dot - dent->d_name), dent->d_name); | |
1201 | ||
a2a99e8e | 1202 | strxfrchar(dso_name, '-', '_'); |
439d473b ACM |
1203 | map = kernel_maps__find_by_dso_name(dso_name); |
1204 | if (map == NULL) | |
1205 | continue; | |
1206 | ||
1207 | snprintf(path, sizeof(path), "%s/%s", | |
1208 | dirname, dent->d_name); | |
1209 | ||
cfc10d3b ACM |
1210 | long_name = strdup(path); |
1211 | if (long_name == NULL) | |
439d473b | 1212 | goto failure; |
cfc10d3b | 1213 | dso__set_long_name(map->dso, long_name); |
439d473b | 1214 | } |
439d473b | 1215 | } |
6cfcc53e | 1216 | |
c338aee8 | 1217 | return 0; |
439d473b ACM |
1218 | failure: |
1219 | closedir(dir); | |
1220 | return -1; | |
1221 | } | |
6cfcc53e | 1222 | |
c338aee8 | 1223 | static int dsos__set_modules_path(void) |
439d473b ACM |
1224 | { |
1225 | struct utsname uts; | |
1226 | char modules_path[PATH_MAX]; | |
6cfcc53e | 1227 | |
439d473b ACM |
1228 | if (uname(&uts) < 0) |
1229 | return -1; | |
6cfcc53e | 1230 | |
439d473b ACM |
1231 | snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel", |
1232 | uts.release); | |
6cfcc53e | 1233 | |
c338aee8 | 1234 | return dsos__set_modules_path_dir(modules_path); |
6cfcc53e MG |
1235 | } |
1236 | ||
439d473b ACM |
1237 | /* |
1238 | * Constructor variant for modules (where we know from /proc/modules where | |
1239 | * they are loaded) and for vmlinux, where only after we load all the | |
1240 | * symbols we'll know where it starts and ends. | |
1241 | */ | |
1242 | static struct map *map__new2(u64 start, struct dso *dso) | |
6cfcc53e | 1243 | { |
439d473b | 1244 | struct map *self = malloc(sizeof(*self)); |
6cfcc53e | 1245 | |
439d473b | 1246 | if (self != NULL) { |
439d473b | 1247 | /* |
afb7b4f0 | 1248 | * ->end will be filled after we load all the symbols |
439d473b | 1249 | */ |
afb7b4f0 | 1250 | map__init(self, start, 0, 0, dso); |
439d473b | 1251 | } |
afb7b4f0 | 1252 | |
439d473b ACM |
1253 | return self; |
1254 | } | |
1255 | ||
c338aee8 | 1256 | static int kernel_maps__create_module_maps(void) |
439d473b ACM |
1257 | { |
1258 | char *line = NULL; | |
1259 | size_t n; | |
1260 | FILE *file = fopen("/proc/modules", "r"); | |
1261 | struct map *map; | |
6cfcc53e | 1262 | |
439d473b ACM |
1263 | if (file == NULL) |
1264 | return -1; | |
6cfcc53e | 1265 | |
439d473b ACM |
1266 | while (!feof(file)) { |
1267 | char name[PATH_MAX]; | |
1268 | u64 start; | |
1269 | struct dso *dso; | |
1270 | char *sep; | |
1271 | int line_len; | |
6cfcc53e | 1272 | |
439d473b ACM |
1273 | line_len = getline(&line, &n, file); |
1274 | if (line_len < 0) | |
1275 | break; | |
1276 | ||
1277 | if (!line) | |
1278 | goto out_failure; | |
1279 | ||
1280 | line[--line_len] = '\0'; /* \n */ | |
1281 | ||
1282 | sep = strrchr(line, 'x'); | |
1283 | if (sep == NULL) | |
1284 | continue; | |
1285 | ||
1286 | hex2u64(sep + 1, &start); | |
1287 | ||
1288 | sep = strchr(line, ' '); | |
1289 | if (sep == NULL) | |
1290 | continue; | |
1291 | ||
1292 | *sep = '\0'; | |
1293 | ||
1294 | snprintf(name, sizeof(name), "[%s]", line); | |
00a192b3 | 1295 | dso = dso__new(name); |
439d473b ACM |
1296 | |
1297 | if (dso == NULL) | |
1298 | goto out_delete_line; | |
1299 | ||
1300 | map = map__new2(start, dso); | |
1301 | if (map == NULL) { | |
1302 | dso__delete(dso); | |
1303 | goto out_delete_line; | |
6cfcc53e | 1304 | } |
439d473b | 1305 | |
f1617b40 ACM |
1306 | snprintf(name, sizeof(name), |
1307 | "/sys/module/%s/notes/.note.gnu.build-id", line); | |
1308 | if (sysfs__read_build_id(name, dso->build_id, | |
1309 | sizeof(dso->build_id)) == 0) | |
1310 | dso->has_build_id = true; | |
1311 | ||
439d473b ACM |
1312 | dso->origin = DSO__ORIG_KMODULE; |
1313 | kernel_maps__insert(map); | |
1314 | dsos__add(dso); | |
6cfcc53e | 1315 | } |
439d473b ACM |
1316 | |
1317 | free(line); | |
1318 | fclose(file); | |
1319 | ||
c338aee8 ACM |
1320 | /* |
1321 | * Now that we have all sorted out, just set the ->end of all | |
1322 | * maps: | |
1323 | */ | |
1324 | kernel_maps__fixup_end(); | |
1325 | ||
1326 | return dsos__set_modules_path(); | |
439d473b ACM |
1327 | |
1328 | out_delete_line: | |
1329 | free(line); | |
1330 | out_failure: | |
1331 | return -1; | |
6cfcc53e MG |
1332 | } |
1333 | ||
439d473b | 1334 | static int dso__load_vmlinux(struct dso *self, struct map *map, |
6beba7ad | 1335 | const char *vmlinux, symbol_filter_t filter) |
a2928c42 ACM |
1336 | { |
1337 | int err, fd = open(vmlinux, O_RDONLY); | |
1338 | ||
8d06367f | 1339 | self->loaded = 1; |
66bd8424 | 1340 | |
a2928c42 ACM |
1341 | if (fd < 0) |
1342 | return -1; | |
1343 | ||
6beba7ad | 1344 | err = dso__load_sym(self, map, self->long_name, fd, filter, 1, 0); |
6cfcc53e | 1345 | |
a2928c42 ACM |
1346 | close(fd); |
1347 | ||
1348 | return err; | |
1349 | } | |
1350 | ||
c338aee8 ACM |
1351 | static int dso__load_kernel_sym(struct dso *self, struct map *map, |
1352 | symbol_filter_t filter) | |
a827c875 | 1353 | { |
c338aee8 | 1354 | int err = dso__load_vmlinux(self, map, self->name, filter); |
439d473b | 1355 | |
9974f496 | 1356 | if (err <= 0) |
c338aee8 | 1357 | err = kernel_maps__load_kallsyms(filter); |
439d473b ACM |
1358 | |
1359 | if (err > 0) { | |
c338aee8 ACM |
1360 | map__fixup_start(map); |
1361 | map__fixup_end(map); | |
439d473b | 1362 | } |
94cb9e38 | 1363 | |
a827c875 ACM |
1364 | return err; |
1365 | } | |
1366 | ||
cd84c2ac | 1367 | LIST_HEAD(dsos); |
cd84c2ac | 1368 | struct dso *vdso; |
cd84c2ac | 1369 | |
83a0944f | 1370 | const char *vmlinux_name = "vmlinux"; |
cd84c2ac FW |
1371 | |
1372 | static void dsos__add(struct dso *dso) | |
1373 | { | |
1374 | list_add_tail(&dso->node, &dsos); | |
1375 | } | |
1376 | ||
1377 | static struct dso *dsos__find(const char *name) | |
1378 | { | |
1379 | struct dso *pos; | |
1380 | ||
1381 | list_for_each_entry(pos, &dsos, node) | |
1382 | if (strcmp(pos->name, name) == 0) | |
1383 | return pos; | |
1384 | return NULL; | |
1385 | } | |
1386 | ||
00a192b3 | 1387 | struct dso *dsos__findnew(const char *name) |
cd84c2ac FW |
1388 | { |
1389 | struct dso *dso = dsos__find(name); | |
cd84c2ac | 1390 | |
e4204992 | 1391 | if (!dso) { |
00a192b3 | 1392 | dso = dso__new(name); |
cfc10d3b | 1393 | if (dso != NULL) { |
e4204992 | 1394 | dsos__add(dso); |
cfc10d3b ACM |
1395 | dso__set_basename(dso); |
1396 | } | |
66bd8424 | 1397 | } |
cd84c2ac FW |
1398 | |
1399 | return dso; | |
cd84c2ac FW |
1400 | } |
1401 | ||
1402 | void dsos__fprintf(FILE *fp) | |
1403 | { | |
1404 | struct dso *pos; | |
1405 | ||
1406 | list_for_each_entry(pos, &dsos, node) | |
1407 | dso__fprintf(pos, fp); | |
1408 | } | |
1409 | ||
9e03eb2d ACM |
1410 | size_t dsos__fprintf_buildid(FILE *fp) |
1411 | { | |
1412 | struct dso *pos; | |
1413 | size_t ret = 0; | |
1414 | ||
1415 | list_for_each_entry(pos, &dsos, node) { | |
1416 | ret += dso__fprintf_buildid(pos, fp); | |
1124ba73 | 1417 | ret += fprintf(fp, " %s\n", pos->long_name); |
9e03eb2d ACM |
1418 | } |
1419 | return ret; | |
1420 | } | |
1421 | ||
c338aee8 | 1422 | static int kernel_maps__create_kernel_map(void) |
cd84c2ac | 1423 | { |
2446042c | 1424 | struct dso *kernel = dso__new(vmlinux_name); |
cd84c2ac | 1425 | |
2446042c | 1426 | if (kernel == NULL) |
c338aee8 ACM |
1427 | return -1; |
1428 | ||
1429 | kernel_map = map__new2(0, kernel); | |
1430 | if (kernel_map == NULL) | |
1431 | goto out_delete_kernel_dso; | |
1432 | ||
1433 | kernel_map->map_ip = kernel_map->unmap_ip = identity__map_ip; | |
2446042c ACM |
1434 | |
1435 | kernel->short_name = "[kernel]"; | |
c338aee8 | 1436 | kernel->kernel = 1; |
00a192b3 | 1437 | vdso = dso__new("[vdso]"); |
c338aee8 ACM |
1438 | if (vdso == NULL) |
1439 | goto out_delete_kernel_map; | |
2446042c ACM |
1440 | |
1441 | if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id, | |
1442 | sizeof(kernel->build_id)) == 0) | |
1443 | kernel->has_build_id = true; | |
cd84c2ac | 1444 | |
c338aee8 | 1445 | kernel_maps__insert(kernel_map); |
2446042c | 1446 | dsos__add(kernel); |
cd84c2ac FW |
1447 | dsos__add(vdso); |
1448 | ||
c338aee8 ACM |
1449 | return 0; |
1450 | ||
1451 | out_delete_kernel_map: | |
1452 | map__delete(kernel_map); | |
1453 | kernel_map = NULL; | |
1454 | out_delete_kernel_dso: | |
1455 | dso__delete(kernel); | |
1456 | return -1; | |
2446042c ACM |
1457 | } |
1458 | ||
c338aee8 | 1459 | int kernel_maps__init(bool use_modules) |
2446042c | 1460 | { |
c338aee8 | 1461 | if (kernel_maps__create_kernel_map() < 0) |
2446042c ACM |
1462 | return -1; |
1463 | ||
c338aee8 ACM |
1464 | if (use_modules && kernel_maps__create_module_maps() < 0) |
1465 | pr_warning("Failed to load list of modules in use, " | |
1466 | "continuing...\n"); | |
6671cb16 ACM |
1467 | |
1468 | return 0; | |
cd84c2ac FW |
1469 | } |
1470 | ||
00a192b3 | 1471 | void symbol__init(unsigned int priv_size) |
a2928c42 ACM |
1472 | { |
1473 | elf_version(EV_CURRENT); | |
00a192b3 | 1474 | symbol__priv_size = priv_size; |
a2928c42 | 1475 | } |