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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 ACM |
4 | #include "symbol.h" |
5 | ||
6 | #include <libelf.h> | |
7 | #include <gelf.h> | |
8 | #include <elf.h> | |
28ac909b | 9 | #include <bfd.h> |
a2928c42 | 10 | |
0b73da3f IM |
11 | const char *sym_hist_filter; |
12 | ||
28ac909b ACM |
13 | #ifndef DMGL_PARAMS |
14 | #define DMGL_PARAMS (1 << 0) /* Include function args */ | |
15 | #define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */ | |
16 | #endif | |
17 | ||
9cffa8d5 | 18 | static struct symbol *symbol__new(u64 start, u64 len, |
0b73da3f | 19 | const char *name, unsigned int priv_size, |
9cffa8d5 | 20 | u64 obj_start, int verbose) |
a2928c42 | 21 | { |
0085c954 | 22 | size_t namelen = strlen(name) + 1; |
0b73da3f | 23 | struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen); |
a2928c42 | 24 | |
0b73da3f IM |
25 | if (!self) |
26 | return NULL; | |
27 | ||
28 | if (verbose >= 2) | |
29 | printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n", | |
9cffa8d5 | 30 | (u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start); |
0b73da3f IM |
31 | |
32 | self->obj_start= obj_start; | |
33 | self->hist = NULL; | |
34 | self->hist_sum = 0; | |
35 | ||
36 | if (sym_hist_filter && !strcmp(name, sym_hist_filter)) | |
9cffa8d5 | 37 | self->hist = calloc(sizeof(u64), len); |
0b73da3f IM |
38 | |
39 | if (priv_size) { | |
40 | memset(self, 0, priv_size); | |
41 | self = ((void *)self) + priv_size; | |
a2928c42 | 42 | } |
0b73da3f | 43 | self->start = start; |
6cfcc53e | 44 | self->end = len ? start + len - 1 : start; |
0b73da3f | 45 | memcpy(self->name, name, namelen); |
a2928c42 ACM |
46 | |
47 | return self; | |
48 | } | |
49 | ||
0085c954 | 50 | static void symbol__delete(struct symbol *self, unsigned int priv_size) |
a2928c42 | 51 | { |
0085c954 | 52 | free(((void *)self) - priv_size); |
a2928c42 ACM |
53 | } |
54 | ||
55 | static size_t symbol__fprintf(struct symbol *self, FILE *fp) | |
56 | { | |
6cfcc53e MG |
57 | if (!self->module) |
58 | return fprintf(fp, " %llx-%llx %s\n", | |
a2928c42 | 59 | self->start, self->end, self->name); |
6cfcc53e MG |
60 | else |
61 | return fprintf(fp, " %llx-%llx %s \t[%s]\n", | |
62 | self->start, self->end, self->name, self->module->name); | |
a2928c42 ACM |
63 | } |
64 | ||
0085c954 | 65 | struct dso *dso__new(const char *name, unsigned int sym_priv_size) |
a2928c42 ACM |
66 | { |
67 | struct dso *self = malloc(sizeof(*self) + strlen(name) + 1); | |
68 | ||
69 | if (self != NULL) { | |
70 | strcpy(self->name, name); | |
71 | self->syms = RB_ROOT; | |
0085c954 | 72 | self->sym_priv_size = sym_priv_size; |
fc54db51 | 73 | self->find_symbol = dso__find_symbol; |
52d422de | 74 | self->slen_calculated = 0; |
a2928c42 ACM |
75 | } |
76 | ||
77 | return self; | |
78 | } | |
79 | ||
80 | static void dso__delete_symbols(struct dso *self) | |
81 | { | |
82 | struct symbol *pos; | |
83 | struct rb_node *next = rb_first(&self->syms); | |
84 | ||
85 | while (next) { | |
86 | pos = rb_entry(next, struct symbol, rb_node); | |
87 | next = rb_next(&pos->rb_node); | |
c8c96525 | 88 | rb_erase(&pos->rb_node, &self->syms); |
0085c954 | 89 | symbol__delete(pos, self->sym_priv_size); |
a2928c42 ACM |
90 | } |
91 | } | |
92 | ||
93 | void dso__delete(struct dso *self) | |
94 | { | |
95 | dso__delete_symbols(self); | |
96 | free(self); | |
97 | } | |
98 | ||
99 | static void dso__insert_symbol(struct dso *self, struct symbol *sym) | |
100 | { | |
101 | struct rb_node **p = &self->syms.rb_node; | |
102 | struct rb_node *parent = NULL; | |
9cffa8d5 | 103 | const u64 ip = sym->start; |
a2928c42 ACM |
104 | struct symbol *s; |
105 | ||
106 | while (*p != NULL) { | |
107 | parent = *p; | |
108 | s = rb_entry(parent, struct symbol, rb_node); | |
109 | if (ip < s->start) | |
110 | p = &(*p)->rb_left; | |
111 | else | |
112 | p = &(*p)->rb_right; | |
113 | } | |
114 | rb_link_node(&sym->rb_node, parent, p); | |
115 | rb_insert_color(&sym->rb_node, &self->syms); | |
116 | } | |
117 | ||
9cffa8d5 | 118 | struct symbol *dso__find_symbol(struct dso *self, u64 ip) |
a2928c42 ACM |
119 | { |
120 | struct rb_node *n; | |
121 | ||
122 | if (self == NULL) | |
123 | return NULL; | |
124 | ||
125 | n = self->syms.rb_node; | |
126 | ||
127 | while (n) { | |
128 | struct symbol *s = rb_entry(n, struct symbol, rb_node); | |
129 | ||
130 | if (ip < s->start) | |
131 | n = n->rb_left; | |
132 | else if (ip > s->end) | |
133 | n = n->rb_right; | |
134 | else | |
135 | return s; | |
136 | } | |
137 | ||
138 | return NULL; | |
139 | } | |
140 | ||
141 | size_t dso__fprintf(struct dso *self, FILE *fp) | |
142 | { | |
143 | size_t ret = fprintf(fp, "dso: %s\n", self->name); | |
144 | ||
145 | struct rb_node *nd; | |
146 | for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) { | |
147 | struct symbol *pos = rb_entry(nd, struct symbol, rb_node); | |
148 | ret += symbol__fprintf(pos, fp); | |
149 | } | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
bd74137e | 154 | static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int verbose) |
a2928c42 ACM |
155 | { |
156 | struct rb_node *nd, *prevnd; | |
157 | char *line = NULL; | |
158 | size_t n; | |
159 | FILE *file = fopen("/proc/kallsyms", "r"); | |
9974f496 | 160 | int count = 0; |
a2928c42 ACM |
161 | |
162 | if (file == NULL) | |
163 | goto out_failure; | |
164 | ||
165 | while (!feof(file)) { | |
9cffa8d5 | 166 | u64 start; |
a2928c42 ACM |
167 | struct symbol *sym; |
168 | int line_len, len; | |
169 | char symbol_type; | |
170 | ||
171 | line_len = getline(&line, &n, file); | |
172 | if (line_len < 0) | |
173 | break; | |
174 | ||
175 | if (!line) | |
176 | goto out_failure; | |
177 | ||
178 | line[--line_len] = '\0'; /* \n */ | |
179 | ||
a0055ae2 | 180 | len = hex2u64(line, &start); |
a2928c42 ACM |
181 | |
182 | len++; | |
183 | if (len + 2 >= line_len) | |
184 | continue; | |
185 | ||
186 | symbol_type = toupper(line[len]); | |
187 | /* | |
188 | * We're interested only in code ('T'ext) | |
189 | */ | |
190 | if (symbol_type != 'T' && symbol_type != 'W') | |
191 | continue; | |
192 | /* | |
193 | * Well fix up the end later, when we have all sorted. | |
194 | */ | |
0085c954 | 195 | sym = symbol__new(start, 0xdead, line + len + 2, |
0b73da3f | 196 | self->sym_priv_size, 0, verbose); |
a2928c42 ACM |
197 | |
198 | if (sym == NULL) | |
199 | goto out_delete_line; | |
200 | ||
69ee69f6 ACM |
201 | if (filter && filter(self, sym)) |
202 | symbol__delete(sym, self->sym_priv_size); | |
9974f496 | 203 | else { |
69ee69f6 | 204 | dso__insert_symbol(self, sym); |
9974f496 MG |
205 | count++; |
206 | } | |
a2928c42 ACM |
207 | } |
208 | ||
209 | /* | |
210 | * Now that we have all sorted out, just set the ->end of all | |
211 | * symbols | |
212 | */ | |
213 | prevnd = rb_first(&self->syms); | |
214 | ||
215 | if (prevnd == NULL) | |
216 | goto out_delete_line; | |
217 | ||
218 | for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { | |
219 | struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node), | |
220 | *curr = rb_entry(nd, struct symbol, rb_node); | |
221 | ||
222 | prev->end = curr->start - 1; | |
223 | prevnd = nd; | |
224 | } | |
225 | ||
226 | free(line); | |
227 | fclose(file); | |
228 | ||
9974f496 | 229 | return count; |
a2928c42 ACM |
230 | |
231 | out_delete_line: | |
232 | free(line); | |
233 | out_failure: | |
234 | return -1; | |
235 | } | |
236 | ||
80d496be PE |
237 | static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int verbose) |
238 | { | |
239 | char *line = NULL; | |
240 | size_t n; | |
241 | FILE *file; | |
242 | int nr_syms = 0; | |
243 | ||
244 | file = fopen(self->name, "r"); | |
245 | if (file == NULL) | |
246 | goto out_failure; | |
247 | ||
248 | while (!feof(file)) { | |
9cffa8d5 | 249 | u64 start, size; |
80d496be PE |
250 | struct symbol *sym; |
251 | int line_len, len; | |
252 | ||
253 | line_len = getline(&line, &n, file); | |
254 | if (line_len < 0) | |
255 | break; | |
256 | ||
257 | if (!line) | |
258 | goto out_failure; | |
259 | ||
260 | line[--line_len] = '\0'; /* \n */ | |
261 | ||
262 | len = hex2u64(line, &start); | |
263 | ||
264 | len++; | |
265 | if (len + 2 >= line_len) | |
266 | continue; | |
267 | ||
268 | len += hex2u64(line + len, &size); | |
269 | ||
270 | len++; | |
271 | if (len + 2 >= line_len) | |
272 | continue; | |
273 | ||
274 | sym = symbol__new(start, size, line + len, | |
275 | self->sym_priv_size, start, verbose); | |
276 | ||
277 | if (sym == NULL) | |
278 | goto out_delete_line; | |
279 | ||
280 | if (filter && filter(self, sym)) | |
281 | symbol__delete(sym, self->sym_priv_size); | |
282 | else { | |
283 | dso__insert_symbol(self, sym); | |
284 | nr_syms++; | |
285 | } | |
286 | } | |
287 | ||
288 | free(line); | |
289 | fclose(file); | |
290 | ||
291 | return nr_syms; | |
292 | ||
293 | out_delete_line: | |
294 | free(line); | |
295 | out_failure: | |
296 | return -1; | |
297 | } | |
298 | ||
a2928c42 ACM |
299 | /** |
300 | * elf_symtab__for_each_symbol - iterate thru all the symbols | |
301 | * | |
302 | * @self: struct elf_symtab instance to iterate | |
303 | * @index: uint32_t index | |
304 | * @sym: GElf_Sym iterator | |
305 | */ | |
306 | #define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \ | |
307 | for (index = 0, gelf_getsym(syms, index, &sym);\ | |
308 | index < nr_syms; \ | |
309 | index++, gelf_getsym(syms, index, &sym)) | |
310 | ||
311 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) | |
312 | { | |
313 | return GELF_ST_TYPE(sym->st_info); | |
314 | } | |
315 | ||
316 | static inline int elf_sym__is_function(const GElf_Sym *sym) | |
317 | { | |
318 | return elf_sym__type(sym) == STT_FUNC && | |
319 | sym->st_name != 0 && | |
320 | sym->st_shndx != SHN_UNDEF && | |
321 | sym->st_size != 0; | |
322 | } | |
323 | ||
6cfcc53e MG |
324 | static inline int elf_sym__is_label(const GElf_Sym *sym) |
325 | { | |
326 | return elf_sym__type(sym) == STT_NOTYPE && | |
327 | sym->st_name != 0 && | |
328 | sym->st_shndx != SHN_UNDEF && | |
329 | sym->st_shndx != SHN_ABS; | |
330 | } | |
331 | ||
332 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, | |
333 | const Elf_Data *secstrs) | |
334 | { | |
335 | return secstrs->d_buf + shdr->sh_name; | |
336 | } | |
337 | ||
338 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, | |
339 | const Elf_Data *secstrs) | |
340 | { | |
341 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; | |
342 | } | |
343 | ||
a2928c42 ACM |
344 | static inline const char *elf_sym__name(const GElf_Sym *sym, |
345 | const Elf_Data *symstrs) | |
346 | { | |
347 | return symstrs->d_buf + sym->st_name; | |
348 | } | |
349 | ||
350 | static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, | |
351 | GElf_Shdr *shp, const char *name, | |
352 | size_t *index) | |
353 | { | |
354 | Elf_Scn *sec = NULL; | |
355 | size_t cnt = 1; | |
356 | ||
357 | while ((sec = elf_nextscn(elf, sec)) != NULL) { | |
358 | char *str; | |
359 | ||
360 | gelf_getshdr(sec, shp); | |
361 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); | |
362 | if (!strcmp(name, str)) { | |
363 | if (index) | |
364 | *index = cnt; | |
365 | break; | |
366 | } | |
367 | ++cnt; | |
368 | } | |
369 | ||
370 | return sec; | |
371 | } | |
372 | ||
8ce998d6 ACM |
373 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ |
374 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ | |
375 | idx < nr_entries; \ | |
376 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) | |
377 | ||
378 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ | |
379 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ | |
380 | idx < nr_entries; \ | |
381 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) | |
382 | ||
a25e46c4 ACM |
383 | /* |
384 | * We need to check if we have a .dynsym, so that we can handle the | |
385 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it | |
386 | * .dynsym or .symtab). | |
387 | * And always look at the original dso, not at debuginfo packages, that | |
388 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). | |
389 | */ | |
390 | static int dso__synthesize_plt_symbols(struct dso *self, int verbose) | |
8ce998d6 ACM |
391 | { |
392 | uint32_t nr_rel_entries, idx; | |
393 | GElf_Sym sym; | |
9cffa8d5 | 394 | u64 plt_offset; |
8ce998d6 ACM |
395 | GElf_Shdr shdr_plt; |
396 | struct symbol *f; | |
a25e46c4 | 397 | GElf_Shdr shdr_rel_plt, shdr_dynsym; |
8ce998d6 | 398 | Elf_Data *reldata, *syms, *symstrs; |
a25e46c4 ACM |
399 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; |
400 | size_t dynsym_idx; | |
401 | GElf_Ehdr ehdr; | |
8ce998d6 | 402 | char sympltname[1024]; |
a25e46c4 ACM |
403 | Elf *elf; |
404 | int nr = 0, symidx, fd, err = 0; | |
405 | ||
406 | fd = open(self->name, O_RDONLY); | |
407 | if (fd < 0) | |
408 | goto out; | |
409 | ||
410 | elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); | |
411 | if (elf == NULL) | |
412 | goto out_close; | |
413 | ||
414 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
415 | goto out_elf_end; | |
416 | ||
417 | scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym, | |
418 | ".dynsym", &dynsym_idx); | |
419 | if (scn_dynsym == NULL) | |
420 | goto out_elf_end; | |
8ce998d6 | 421 | |
a25e46c4 | 422 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
8ce998d6 ACM |
423 | ".rela.plt", NULL); |
424 | if (scn_plt_rel == NULL) { | |
a25e46c4 | 425 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
8ce998d6 ACM |
426 | ".rel.plt", NULL); |
427 | if (scn_plt_rel == NULL) | |
a25e46c4 | 428 | goto out_elf_end; |
8ce998d6 ACM |
429 | } |
430 | ||
a25e46c4 ACM |
431 | err = -1; |
432 | ||
8ce998d6 | 433 | if (shdr_rel_plt.sh_link != dynsym_idx) |
a25e46c4 | 434 | goto out_elf_end; |
8ce998d6 | 435 | |
a25e46c4 ACM |
436 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) |
437 | goto out_elf_end; | |
8ce998d6 ACM |
438 | |
439 | /* | |
440 | * Fetch the relocation section to find the indexes to the GOT | |
441 | * and the symbols in the .dynsym they refer to. | |
442 | */ | |
443 | reldata = elf_getdata(scn_plt_rel, NULL); | |
444 | if (reldata == NULL) | |
a25e46c4 | 445 | goto out_elf_end; |
8ce998d6 ACM |
446 | |
447 | syms = elf_getdata(scn_dynsym, NULL); | |
448 | if (syms == NULL) | |
a25e46c4 | 449 | goto out_elf_end; |
8ce998d6 | 450 | |
a25e46c4 | 451 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); |
8ce998d6 | 452 | if (scn_symstrs == NULL) |
a25e46c4 | 453 | goto out_elf_end; |
8ce998d6 ACM |
454 | |
455 | symstrs = elf_getdata(scn_symstrs, NULL); | |
456 | if (symstrs == NULL) | |
a25e46c4 | 457 | goto out_elf_end; |
8ce998d6 ACM |
458 | |
459 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; | |
460 | plt_offset = shdr_plt.sh_offset; | |
461 | ||
462 | if (shdr_rel_plt.sh_type == SHT_RELA) { | |
463 | GElf_Rela pos_mem, *pos; | |
464 | ||
465 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, | |
466 | nr_rel_entries) { | |
467 | symidx = GELF_R_SYM(pos->r_info); | |
468 | plt_offset += shdr_plt.sh_entsize; | |
469 | gelf_getsym(syms, symidx, &sym); | |
470 | snprintf(sympltname, sizeof(sympltname), | |
471 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
472 | ||
473 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
0b73da3f | 474 | sympltname, self->sym_priv_size, 0, verbose); |
8ce998d6 | 475 | if (!f) |
a25e46c4 | 476 | goto out_elf_end; |
8ce998d6 ACM |
477 | |
478 | dso__insert_symbol(self, f); | |
479 | ++nr; | |
480 | } | |
481 | } else if (shdr_rel_plt.sh_type == SHT_REL) { | |
482 | GElf_Rel pos_mem, *pos; | |
483 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, | |
484 | nr_rel_entries) { | |
485 | symidx = GELF_R_SYM(pos->r_info); | |
486 | plt_offset += shdr_plt.sh_entsize; | |
487 | gelf_getsym(syms, symidx, &sym); | |
488 | snprintf(sympltname, sizeof(sympltname), | |
489 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
490 | ||
491 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
0b73da3f | 492 | sympltname, self->sym_priv_size, 0, verbose); |
8ce998d6 | 493 | if (!f) |
a25e46c4 | 494 | goto out_elf_end; |
8ce998d6 ACM |
495 | |
496 | dso__insert_symbol(self, f); | |
497 | ++nr; | |
498 | } | |
8ce998d6 ACM |
499 | } |
500 | ||
a25e46c4 ACM |
501 | err = 0; |
502 | out_elf_end: | |
503 | elf_end(elf); | |
504 | out_close: | |
505 | close(fd); | |
506 | ||
507 | if (err == 0) | |
508 | return nr; | |
509 | out: | |
510 | fprintf(stderr, "%s: problems reading %s PLT info.\n", | |
511 | __func__, self->name); | |
512 | return 0; | |
8ce998d6 ACM |
513 | } |
514 | ||
69ee69f6 | 515 | static int dso__load_sym(struct dso *self, int fd, const char *name, |
6cfcc53e | 516 | symbol_filter_t filter, int verbose, struct module *mod) |
a2928c42 | 517 | { |
6cfcc53e | 518 | Elf_Data *symstrs, *secstrs; |
a2928c42 ACM |
519 | uint32_t nr_syms; |
520 | int err = -1; | |
521 | uint32_t index; | |
522 | GElf_Ehdr ehdr; | |
523 | GElf_Shdr shdr; | |
524 | Elf_Data *syms; | |
525 | GElf_Sym sym; | |
a25e46c4 | 526 | Elf_Scn *sec, *sec_strndx; |
a2928c42 | 527 | Elf *elf; |
d20ff6bd | 528 | int nr = 0, kernel = !strcmp("[kernel]", self->name); |
a2928c42 ACM |
529 | |
530 | elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); | |
531 | if (elf == NULL) { | |
bd74137e IM |
532 | if (verbose) |
533 | fprintf(stderr, "%s: cannot read %s ELF file.\n", | |
534 | __func__, name); | |
a2928c42 ACM |
535 | goto out_close; |
536 | } | |
537 | ||
538 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
bd74137e IM |
539 | if (verbose) |
540 | fprintf(stderr, "%s: cannot get elf header.\n", __func__); | |
a2928c42 ACM |
541 | goto out_elf_end; |
542 | } | |
543 | ||
544 | sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL); | |
8ce998d6 | 545 | if (sec == NULL) { |
a25e46c4 ACM |
546 | sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL); |
547 | if (sec == NULL) | |
8ce998d6 | 548 | goto out_elf_end; |
8ce998d6 | 549 | } |
a2928c42 ACM |
550 | |
551 | syms = elf_getdata(sec, NULL); | |
552 | if (syms == NULL) | |
553 | goto out_elf_end; | |
554 | ||
555 | sec = elf_getscn(elf, shdr.sh_link); | |
556 | if (sec == NULL) | |
557 | goto out_elf_end; | |
558 | ||
559 | symstrs = elf_getdata(sec, NULL); | |
560 | if (symstrs == NULL) | |
561 | goto out_elf_end; | |
562 | ||
6cfcc53e MG |
563 | sec_strndx = elf_getscn(elf, ehdr.e_shstrndx); |
564 | if (sec_strndx == NULL) | |
565 | goto out_elf_end; | |
566 | ||
567 | secstrs = elf_getdata(sec_strndx, NULL); | |
568 | if (symstrs == NULL) | |
569 | goto out_elf_end; | |
570 | ||
a2928c42 ACM |
571 | nr_syms = shdr.sh_size / shdr.sh_entsize; |
572 | ||
e9fbc9dc | 573 | memset(&sym, 0, sizeof(sym)); |
d20ff6bd MG |
574 | if (!kernel) { |
575 | self->adjust_symbols = (ehdr.e_type == ET_EXEC || | |
30d7a77d ACM |
576 | elf_section_by_name(elf, &ehdr, &shdr, |
577 | ".gnu.prelink_undo", | |
578 | NULL) != NULL); | |
d20ff6bd MG |
579 | } else self->adjust_symbols = 0; |
580 | ||
a2928c42 ACM |
581 | elf_symtab__for_each_symbol(syms, nr_syms, index, sym) { |
582 | struct symbol *f; | |
28ac909b ACM |
583 | const char *name; |
584 | char *demangled; | |
9cffa8d5 | 585 | u64 obj_start; |
6cfcc53e MG |
586 | struct section *section = NULL; |
587 | int is_label = elf_sym__is_label(&sym); | |
588 | const char *section_name; | |
a2928c42 | 589 | |
6cfcc53e | 590 | if (!is_label && !elf_sym__is_function(&sym)) |
a2928c42 ACM |
591 | continue; |
592 | ||
593 | sec = elf_getscn(elf, sym.st_shndx); | |
594 | if (!sec) | |
595 | goto out_elf_end; | |
596 | ||
597 | gelf_getshdr(sec, &shdr); | |
6cfcc53e MG |
598 | |
599 | if (is_label && !elf_sec__is_text(&shdr, secstrs)) | |
600 | continue; | |
601 | ||
602 | section_name = elf_sec__name(&shdr, secstrs); | |
0b73da3f IM |
603 | obj_start = sym.st_value; |
604 | ||
30d7a77d | 605 | if (self->adjust_symbols) { |
f5812a7a ACM |
606 | if (verbose >= 2) |
607 | printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n", | |
608 | (u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset); | |
520f2c34 | 609 | |
f5812a7a ACM |
610 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; |
611 | } | |
a2928c42 | 612 | |
6cfcc53e MG |
613 | if (mod) { |
614 | section = mod->sections->find_section(mod->sections, section_name); | |
615 | if (section) | |
616 | sym.st_value += section->vma; | |
617 | else { | |
618 | fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n", | |
619 | mod->name, section_name); | |
620 | goto out_elf_end; | |
621 | } | |
622 | } | |
28ac909b ACM |
623 | /* |
624 | * We need to figure out if the object was created from C++ sources | |
625 | * DWARF DW_compile_unit has this, but we don't always have access | |
626 | * to it... | |
627 | */ | |
628 | name = elf_sym__name(&sym, symstrs); | |
629 | demangled = bfd_demangle(NULL, name, DMGL_PARAMS | DMGL_ANSI); | |
630 | if (demangled != NULL) | |
631 | name = demangled; | |
6cfcc53e | 632 | |
28ac909b | 633 | f = symbol__new(sym.st_value, sym.st_size, name, |
0b73da3f | 634 | self->sym_priv_size, obj_start, verbose); |
28ac909b | 635 | free(demangled); |
a2928c42 ACM |
636 | if (!f) |
637 | goto out_elf_end; | |
638 | ||
69ee69f6 ACM |
639 | if (filter && filter(self, f)) |
640 | symbol__delete(f, self->sym_priv_size); | |
641 | else { | |
6cfcc53e | 642 | f->module = mod; |
69ee69f6 ACM |
643 | dso__insert_symbol(self, f); |
644 | nr++; | |
645 | } | |
a2928c42 ACM |
646 | } |
647 | ||
648 | err = nr; | |
649 | out_elf_end: | |
650 | elf_end(elf); | |
651 | out_close: | |
652 | return err; | |
653 | } | |
654 | ||
bd74137e | 655 | int dso__load(struct dso *self, symbol_filter_t filter, int verbose) |
a2928c42 ACM |
656 | { |
657 | int size = strlen(self->name) + sizeof("/usr/lib/debug%s.debug"); | |
658 | char *name = malloc(size); | |
659 | int variant = 0; | |
660 | int ret = -1; | |
661 | int fd; | |
662 | ||
663 | if (!name) | |
664 | return -1; | |
665 | ||
30d7a77d | 666 | self->adjust_symbols = 0; |
f5812a7a | 667 | |
80d496be PE |
668 | if (strncmp(self->name, "/tmp/perf-", 10) == 0) |
669 | return dso__load_perf_map(self, filter, verbose); | |
670 | ||
a2928c42 ACM |
671 | more: |
672 | do { | |
673 | switch (variant) { | |
674 | case 0: /* Fedora */ | |
675 | snprintf(name, size, "/usr/lib/debug%s.debug", self->name); | |
676 | break; | |
677 | case 1: /* Ubuntu */ | |
678 | snprintf(name, size, "/usr/lib/debug%s", self->name); | |
679 | break; | |
680 | case 2: /* Sane people */ | |
681 | snprintf(name, size, "%s", self->name); | |
682 | break; | |
683 | ||
684 | default: | |
685 | goto out; | |
686 | } | |
687 | variant++; | |
688 | ||
689 | fd = open(name, O_RDONLY); | |
690 | } while (fd < 0); | |
691 | ||
6cfcc53e | 692 | ret = dso__load_sym(self, fd, name, filter, verbose, NULL); |
a2928c42 ACM |
693 | close(fd); |
694 | ||
695 | /* | |
696 | * Some people seem to have debuginfo files _WITHOUT_ debug info!?!? | |
697 | */ | |
698 | if (!ret) | |
699 | goto more; | |
700 | ||
a25e46c4 ACM |
701 | if (ret > 0) { |
702 | int nr_plt = dso__synthesize_plt_symbols(self, verbose); | |
703 | if (nr_plt > 0) | |
704 | ret += nr_plt; | |
705 | } | |
a2928c42 ACM |
706 | out: |
707 | free(name); | |
708 | return ret; | |
709 | } | |
710 | ||
6cfcc53e MG |
711 | static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name, |
712 | symbol_filter_t filter, int verbose) | |
713 | { | |
714 | struct module *mod = mod_dso__find_module(mods, name); | |
715 | int err = 0, fd; | |
716 | ||
717 | if (mod == NULL || !mod->active) | |
718 | return err; | |
719 | ||
720 | fd = open(mod->path, O_RDONLY); | |
721 | ||
722 | if (fd < 0) | |
723 | return err; | |
724 | ||
725 | err = dso__load_sym(self, fd, name, filter, verbose, mod); | |
726 | close(fd); | |
727 | ||
728 | return err; | |
729 | } | |
730 | ||
731 | int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose) | |
732 | { | |
733 | struct mod_dso *mods = mod_dso__new_dso("modules"); | |
734 | struct module *pos; | |
735 | struct rb_node *next; | |
736 | int err; | |
737 | ||
738 | err = mod_dso__load_modules(mods); | |
739 | ||
740 | if (err <= 0) | |
741 | return err; | |
742 | ||
743 | /* | |
744 | * Iterate over modules, and load active symbols. | |
745 | */ | |
746 | next = rb_first(&mods->mods); | |
747 | while (next) { | |
748 | pos = rb_entry(next, struct module, rb_node); | |
749 | err = dso__load_module(self, mods, pos->name, filter, verbose); | |
750 | ||
751 | if (err < 0) | |
752 | break; | |
753 | ||
754 | next = rb_next(&pos->rb_node); | |
755 | } | |
756 | ||
757 | if (err < 0) { | |
758 | mod_dso__delete_modules(mods); | |
759 | mod_dso__delete_self(mods); | |
760 | } | |
761 | ||
762 | return err; | |
763 | } | |
764 | ||
765 | static inline void dso__fill_symbol_holes(struct dso *self) | |
766 | { | |
767 | struct symbol *prev = NULL; | |
768 | struct rb_node *nd; | |
769 | ||
770 | for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) { | |
771 | struct symbol *pos = rb_entry(nd, struct symbol, rb_node); | |
772 | ||
773 | if (prev) { | |
774 | u64 hole = 0; | |
775 | int alias = pos->start == prev->start; | |
776 | ||
777 | if (!alias) | |
778 | hole = prev->start - pos->end - 1; | |
779 | ||
780 | if (hole || alias) { | |
781 | if (alias) | |
782 | pos->end = prev->end; | |
783 | else if (hole) | |
784 | pos->end = prev->start - 1; | |
785 | } | |
786 | } | |
787 | prev = pos; | |
788 | } | |
789 | } | |
790 | ||
69ee69f6 | 791 | static int dso__load_vmlinux(struct dso *self, const char *vmlinux, |
bd74137e | 792 | symbol_filter_t filter, int verbose) |
a2928c42 ACM |
793 | { |
794 | int err, fd = open(vmlinux, O_RDONLY); | |
795 | ||
796 | if (fd < 0) | |
797 | return -1; | |
798 | ||
6cfcc53e MG |
799 | err = dso__load_sym(self, fd, vmlinux, filter, verbose, NULL); |
800 | ||
801 | if (err > 0) | |
802 | dso__fill_symbol_holes(self); | |
803 | ||
a2928c42 ACM |
804 | close(fd); |
805 | ||
806 | return err; | |
807 | } | |
808 | ||
bd74137e | 809 | int dso__load_kernel(struct dso *self, const char *vmlinux, |
6cfcc53e | 810 | symbol_filter_t filter, int verbose, int modules) |
a827c875 ACM |
811 | { |
812 | int err = -1; | |
813 | ||
6cfcc53e | 814 | if (vmlinux) { |
bd74137e | 815 | err = dso__load_vmlinux(self, vmlinux, filter, verbose); |
6cfcc53e MG |
816 | if (err > 0 && modules) |
817 | err = dso__load_modules(self, filter, verbose); | |
818 | } | |
a827c875 | 819 | |
9974f496 | 820 | if (err <= 0) |
bd74137e | 821 | err = dso__load_kallsyms(self, filter, verbose); |
a827c875 ACM |
822 | |
823 | return err; | |
824 | } | |
825 | ||
a2928c42 ACM |
826 | void symbol__init(void) |
827 | { | |
828 | elf_version(EV_CURRENT); | |
829 | } |