1 #include "util.h" 2 #include "../perf.h" 3 #include "string.h" 4 #include "symbol.h" 5 6 #include <libelf.h> 7 #include <gelf.h> 8 #include <elf.h> 9 10 const char *sym_hist_filter; 11 12 enum dso_origin { 13 DSO__ORIG_KERNEL = 0, 14 DSO__ORIG_JAVA_JIT, 15 DSO__ORIG_FEDORA, 16 DSO__ORIG_UBUNTU, 17 DSO__ORIG_BUILDID, 18 DSO__ORIG_DSO, 19 DSO__ORIG_NOT_FOUND, 20 }; 21 22 static struct symbol *symbol__new(u64 start, u64 len, 23 const char *name, unsigned int priv_size, 24 u64 obj_start, int verbose) 25 { 26 size_t namelen = strlen(name) + 1; 27 struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen); 28 29 if (!self) 30 return NULL; 31 32 if (verbose >= 2) 33 printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n", 34 (u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start); 35 36 self->obj_start= obj_start; 37 self->hist = NULL; 38 self->hist_sum = 0; 39 40 if (sym_hist_filter && !strcmp(name, sym_hist_filter)) 41 self->hist = calloc(sizeof(u64), len); 42 43 if (priv_size) { 44 memset(self, 0, priv_size); 45 self = ((void *)self) + priv_size; 46 } 47 self->start = start; 48 self->end = len ? start + len - 1 : start; 49 memcpy(self->name, name, namelen); 50 51 return self; 52 } 53 54 static void symbol__delete(struct symbol *self, unsigned int priv_size) 55 { 56 free(((void *)self) - priv_size); 57 } 58 59 static size_t symbol__fprintf(struct symbol *self, FILE *fp) 60 { 61 if (!self->module) 62 return fprintf(fp, " %llx-%llx %s\n", 63 self->start, self->end, self->name); 64 else 65 return fprintf(fp, " %llx-%llx %s \t[%s]\n", 66 self->start, self->end, self->name, self->module->name); 67 } 68 69 struct dso *dso__new(const char *name, unsigned int sym_priv_size) 70 { 71 struct dso *self = malloc(sizeof(*self) + strlen(name) + 1); 72 73 if (self != NULL) { 74 strcpy(self->name, name); 75 self->syms = RB_ROOT; 76 self->sym_priv_size = sym_priv_size; 77 self->find_symbol = dso__find_symbol; 78 self->slen_calculated = 0; 79 self->origin = DSO__ORIG_NOT_FOUND; 80 } 81 82 return self; 83 } 84 85 static void dso__delete_symbols(struct dso *self) 86 { 87 struct symbol *pos; 88 struct rb_node *next = rb_first(&self->syms); 89 90 while (next) { 91 pos = rb_entry(next, struct symbol, rb_node); 92 next = rb_next(&pos->rb_node); 93 rb_erase(&pos->rb_node, &self->syms); 94 symbol__delete(pos, self->sym_priv_size); 95 } 96 } 97 98 void dso__delete(struct dso *self) 99 { 100 dso__delete_symbols(self); 101 free(self); 102 } 103 104 static void dso__insert_symbol(struct dso *self, struct symbol *sym) 105 { 106 struct rb_node **p = &self->syms.rb_node; 107 struct rb_node *parent = NULL; 108 const u64 ip = sym->start; 109 struct symbol *s; 110 111 while (*p != NULL) { 112 parent = *p; 113 s = rb_entry(parent, struct symbol, rb_node); 114 if (ip < s->start) 115 p = &(*p)->rb_left; 116 else 117 p = &(*p)->rb_right; 118 } 119 rb_link_node(&sym->rb_node, parent, p); 120 rb_insert_color(&sym->rb_node, &self->syms); 121 } 122 123 struct symbol *dso__find_symbol(struct dso *self, u64 ip) 124 { 125 struct rb_node *n; 126 127 if (self == NULL) 128 return NULL; 129 130 n = self->syms.rb_node; 131 132 while (n) { 133 struct symbol *s = rb_entry(n, struct symbol, rb_node); 134 135 if (ip < s->start) 136 n = n->rb_left; 137 else if (ip > s->end) 138 n = n->rb_right; 139 else 140 return s; 141 } 142 143 return NULL; 144 } 145 146 size_t dso__fprintf(struct dso *self, FILE *fp) 147 { 148 size_t ret = fprintf(fp, "dso: %s\n", self->name); 149 150 struct rb_node *nd; 151 for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) { 152 struct symbol *pos = rb_entry(nd, struct symbol, rb_node); 153 ret += symbol__fprintf(pos, fp); 154 } 155 156 return ret; 157 } 158 159 static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int verbose) 160 { 161 struct rb_node *nd, *prevnd; 162 char *line = NULL; 163 size_t n; 164 FILE *file = fopen("/proc/kallsyms", "r"); 165 int count = 0; 166 167 if (file == NULL) 168 goto out_failure; 169 170 while (!feof(file)) { 171 u64 start; 172 struct symbol *sym; 173 int line_len, len; 174 char symbol_type; 175 176 line_len = getline(&line, &n, file); 177 if (line_len < 0) 178 break; 179 180 if (!line) 181 goto out_failure; 182 183 line[--line_len] = '\0'; /* \n */ 184 185 len = hex2u64(line, &start); 186 187 len++; 188 if (len + 2 >= line_len) 189 continue; 190 191 symbol_type = toupper(line[len]); 192 /* 193 * We're interested only in code ('T'ext) 194 */ 195 if (symbol_type != 'T' && symbol_type != 'W') 196 continue; 197 /* 198 * Well fix up the end later, when we have all sorted. 199 */ 200 sym = symbol__new(start, 0xdead, line + len + 2, 201 self->sym_priv_size, 0, verbose); 202 203 if (sym == NULL) 204 goto out_delete_line; 205 206 if (filter && filter(self, sym)) 207 symbol__delete(sym, self->sym_priv_size); 208 else { 209 dso__insert_symbol(self, sym); 210 count++; 211 } 212 } 213 214 /* 215 * Now that we have all sorted out, just set the ->end of all 216 * symbols 217 */ 218 prevnd = rb_first(&self->syms); 219 220 if (prevnd == NULL) 221 goto out_delete_line; 222 223 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { 224 struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node), 225 *curr = rb_entry(nd, struct symbol, rb_node); 226 227 prev->end = curr->start - 1; 228 prevnd = nd; 229 } 230 231 free(line); 232 fclose(file); 233 234 return count; 235 236 out_delete_line: 237 free(line); 238 out_failure: 239 return -1; 240 } 241 242 static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int verbose) 243 { 244 char *line = NULL; 245 size_t n; 246 FILE *file; 247 int nr_syms = 0; 248 249 file = fopen(self->name, "r"); 250 if (file == NULL) 251 goto out_failure; 252 253 while (!feof(file)) { 254 u64 start, size; 255 struct symbol *sym; 256 int line_len, len; 257 258 line_len = getline(&line, &n, file); 259 if (line_len < 0) 260 break; 261 262 if (!line) 263 goto out_failure; 264 265 line[--line_len] = '\0'; /* \n */ 266 267 len = hex2u64(line, &start); 268 269 len++; 270 if (len + 2 >= line_len) 271 continue; 272 273 len += hex2u64(line + len, &size); 274 275 len++; 276 if (len + 2 >= line_len) 277 continue; 278 279 sym = symbol__new(start, size, line + len, 280 self->sym_priv_size, start, verbose); 281 282 if (sym == NULL) 283 goto out_delete_line; 284 285 if (filter && filter(self, sym)) 286 symbol__delete(sym, self->sym_priv_size); 287 else { 288 dso__insert_symbol(self, sym); 289 nr_syms++; 290 } 291 } 292 293 free(line); 294 fclose(file); 295 296 return nr_syms; 297 298 out_delete_line: 299 free(line); 300 out_failure: 301 return -1; 302 } 303 304 /** 305 * elf_symtab__for_each_symbol - iterate thru all the symbols 306 * 307 * @self: struct elf_symtab instance to iterate 308 * @index: uint32_t index 309 * @sym: GElf_Sym iterator 310 */ 311 #define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \ 312 for (index = 0, gelf_getsym(syms, index, &sym);\ 313 index < nr_syms; \ 314 index++, gelf_getsym(syms, index, &sym)) 315 316 static inline uint8_t elf_sym__type(const GElf_Sym *sym) 317 { 318 return GELF_ST_TYPE(sym->st_info); 319 } 320 321 static inline int elf_sym__is_function(const GElf_Sym *sym) 322 { 323 return elf_sym__type(sym) == STT_FUNC && 324 sym->st_name != 0 && 325 sym->st_shndx != SHN_UNDEF && 326 sym->st_size != 0; 327 } 328 329 static inline int elf_sym__is_label(const GElf_Sym *sym) 330 { 331 return elf_sym__type(sym) == STT_NOTYPE && 332 sym->st_name != 0 && 333 sym->st_shndx != SHN_UNDEF && 334 sym->st_shndx != SHN_ABS; 335 } 336 337 static inline const char *elf_sec__name(const GElf_Shdr *shdr, 338 const Elf_Data *secstrs) 339 { 340 return secstrs->d_buf + shdr->sh_name; 341 } 342 343 static inline int elf_sec__is_text(const GElf_Shdr *shdr, 344 const Elf_Data *secstrs) 345 { 346 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; 347 } 348 349 static inline const char *elf_sym__name(const GElf_Sym *sym, 350 const Elf_Data *symstrs) 351 { 352 return symstrs->d_buf + sym->st_name; 353 } 354 355 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, 356 GElf_Shdr *shp, const char *name, 357 size_t *index) 358 { 359 Elf_Scn *sec = NULL; 360 size_t cnt = 1; 361 362 while ((sec = elf_nextscn(elf, sec)) != NULL) { 363 char *str; 364 365 gelf_getshdr(sec, shp); 366 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); 367 if (!strcmp(name, str)) { 368 if (index) 369 *index = cnt; 370 break; 371 } 372 ++cnt; 373 } 374 375 return sec; 376 } 377 378 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ 379 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ 380 idx < nr_entries; \ 381 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) 382 383 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ 384 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ 385 idx < nr_entries; \ 386 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) 387 388 /* 389 * We need to check if we have a .dynsym, so that we can handle the 390 * .plt, synthesizing its symbols, that aren't on the symtabs (be it 391 * .dynsym or .symtab). 392 * And always look at the original dso, not at debuginfo packages, that 393 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). 394 */ 395 static int dso__synthesize_plt_symbols(struct dso *self, int verbose) 396 { 397 uint32_t nr_rel_entries, idx; 398 GElf_Sym sym; 399 u64 plt_offset; 400 GElf_Shdr shdr_plt; 401 struct symbol *f; 402 GElf_Shdr shdr_rel_plt, shdr_dynsym; 403 Elf_Data *reldata, *syms, *symstrs; 404 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; 405 size_t dynsym_idx; 406 GElf_Ehdr ehdr; 407 char sympltname[1024]; 408 Elf *elf; 409 int nr = 0, symidx, fd, err = 0; 410 411 fd = open(self->name, O_RDONLY); 412 if (fd < 0) 413 goto out; 414 415 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); 416 if (elf == NULL) 417 goto out_close; 418 419 if (gelf_getehdr(elf, &ehdr) == NULL) 420 goto out_elf_end; 421 422 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym, 423 ".dynsym", &dynsym_idx); 424 if (scn_dynsym == NULL) 425 goto out_elf_end; 426 427 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, 428 ".rela.plt", NULL); 429 if (scn_plt_rel == NULL) { 430 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, 431 ".rel.plt", NULL); 432 if (scn_plt_rel == NULL) 433 goto out_elf_end; 434 } 435 436 err = -1; 437 438 if (shdr_rel_plt.sh_link != dynsym_idx) 439 goto out_elf_end; 440 441 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) 442 goto out_elf_end; 443 444 /* 445 * Fetch the relocation section to find the indexes to the GOT 446 * and the symbols in the .dynsym they refer to. 447 */ 448 reldata = elf_getdata(scn_plt_rel, NULL); 449 if (reldata == NULL) 450 goto out_elf_end; 451 452 syms = elf_getdata(scn_dynsym, NULL); 453 if (syms == NULL) 454 goto out_elf_end; 455 456 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); 457 if (scn_symstrs == NULL) 458 goto out_elf_end; 459 460 symstrs = elf_getdata(scn_symstrs, NULL); 461 if (symstrs == NULL) 462 goto out_elf_end; 463 464 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; 465 plt_offset = shdr_plt.sh_offset; 466 467 if (shdr_rel_plt.sh_type == SHT_RELA) { 468 GElf_Rela pos_mem, *pos; 469 470 elf_section__for_each_rela(reldata, pos, pos_mem, idx, 471 nr_rel_entries) { 472 symidx = GELF_R_SYM(pos->r_info); 473 plt_offset += shdr_plt.sh_entsize; 474 gelf_getsym(syms, symidx, &sym); 475 snprintf(sympltname, sizeof(sympltname), 476 "%s@plt", elf_sym__name(&sym, symstrs)); 477 478 f = symbol__new(plt_offset, shdr_plt.sh_entsize, 479 sympltname, self->sym_priv_size, 0, verbose); 480 if (!f) 481 goto out_elf_end; 482 483 dso__insert_symbol(self, f); 484 ++nr; 485 } 486 } else if (shdr_rel_plt.sh_type == SHT_REL) { 487 GElf_Rel pos_mem, *pos; 488 elf_section__for_each_rel(reldata, pos, pos_mem, idx, 489 nr_rel_entries) { 490 symidx = GELF_R_SYM(pos->r_info); 491 plt_offset += shdr_plt.sh_entsize; 492 gelf_getsym(syms, symidx, &sym); 493 snprintf(sympltname, sizeof(sympltname), 494 "%s@plt", elf_sym__name(&sym, symstrs)); 495 496 f = symbol__new(plt_offset, shdr_plt.sh_entsize, 497 sympltname, self->sym_priv_size, 0, verbose); 498 if (!f) 499 goto out_elf_end; 500 501 dso__insert_symbol(self, f); 502 ++nr; 503 } 504 } 505 506 err = 0; 507 out_elf_end: 508 elf_end(elf); 509 out_close: 510 close(fd); 511 512 if (err == 0) 513 return nr; 514 out: 515 fprintf(stderr, "%s: problems reading %s PLT info.\n", 516 __func__, self->name); 517 return 0; 518 } 519 520 static int dso__load_sym(struct dso *self, int fd, const char *name, 521 symbol_filter_t filter, int verbose, struct module *mod) 522 { 523 Elf_Data *symstrs, *secstrs; 524 uint32_t nr_syms; 525 int err = -1; 526 uint32_t index; 527 GElf_Ehdr ehdr; 528 GElf_Shdr shdr; 529 Elf_Data *syms; 530 GElf_Sym sym; 531 Elf_Scn *sec, *sec_strndx; 532 Elf *elf; 533 int nr = 0, kernel = !strcmp("[kernel]", self->name); 534 535 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); 536 if (elf == NULL) { 537 if (verbose) 538 fprintf(stderr, "%s: cannot read %s ELF file.\n", 539 __func__, name); 540 goto out_close; 541 } 542 543 if (gelf_getehdr(elf, &ehdr) == NULL) { 544 if (verbose) 545 fprintf(stderr, "%s: cannot get elf header.\n", __func__); 546 goto out_elf_end; 547 } 548 549 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL); 550 if (sec == NULL) { 551 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL); 552 if (sec == NULL) 553 goto out_elf_end; 554 } 555 556 syms = elf_getdata(sec, NULL); 557 if (syms == NULL) 558 goto out_elf_end; 559 560 sec = elf_getscn(elf, shdr.sh_link); 561 if (sec == NULL) 562 goto out_elf_end; 563 564 symstrs = elf_getdata(sec, NULL); 565 if (symstrs == NULL) 566 goto out_elf_end; 567 568 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx); 569 if (sec_strndx == NULL) 570 goto out_elf_end; 571 572 secstrs = elf_getdata(sec_strndx, NULL); 573 if (secstrs == NULL) 574 goto out_elf_end; 575 576 nr_syms = shdr.sh_size / shdr.sh_entsize; 577 578 memset(&sym, 0, sizeof(sym)); 579 if (!kernel) { 580 self->adjust_symbols = (ehdr.e_type == ET_EXEC || 581 elf_section_by_name(elf, &ehdr, &shdr, 582 ".gnu.prelink_undo", 583 NULL) != NULL); 584 } else self->adjust_symbols = 0; 585 586 elf_symtab__for_each_symbol(syms, nr_syms, index, sym) { 587 struct symbol *f; 588 const char *name; 589 char *demangled; 590 u64 obj_start; 591 struct section *section = NULL; 592 int is_label = elf_sym__is_label(&sym); 593 const char *section_name; 594 595 if (!is_label && !elf_sym__is_function(&sym)) 596 continue; 597 598 sec = elf_getscn(elf, sym.st_shndx); 599 if (!sec) 600 goto out_elf_end; 601 602 gelf_getshdr(sec, &shdr); 603 604 if (is_label && !elf_sec__is_text(&shdr, secstrs)) 605 continue; 606 607 section_name = elf_sec__name(&shdr, secstrs); 608 obj_start = sym.st_value; 609 610 if (self->adjust_symbols) { 611 if (verbose >= 2) 612 printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n", 613 (u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset); 614 615 sym.st_value -= shdr.sh_addr - shdr.sh_offset; 616 } 617 618 if (mod) { 619 section = mod->sections->find_section(mod->sections, section_name); 620 if (section) 621 sym.st_value += section->vma; 622 else { 623 fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n", 624 mod->name, section_name); 625 goto out_elf_end; 626 } 627 } 628 /* 629 * We need to figure out if the object was created from C++ sources 630 * DWARF DW_compile_unit has this, but we don't always have access 631 * to it... 632 */ 633 name = elf_sym__name(&sym, symstrs); 634 demangled = bfd_demangle(NULL, name, DMGL_PARAMS | DMGL_ANSI); 635 if (demangled != NULL) 636 name = demangled; 637 638 f = symbol__new(sym.st_value, sym.st_size, name, 639 self->sym_priv_size, obj_start, verbose); 640 free(demangled); 641 if (!f) 642 goto out_elf_end; 643 644 if (filter && filter(self, f)) 645 symbol__delete(f, self->sym_priv_size); 646 else { 647 f->module = mod; 648 dso__insert_symbol(self, f); 649 nr++; 650 } 651 } 652 653 err = nr; 654 out_elf_end: 655 elf_end(elf); 656 out_close: 657 return err; 658 } 659 660 #define BUILD_ID_SIZE 128 661 662 static char *dso__read_build_id(struct dso *self, int verbose) 663 { 664 int i; 665 GElf_Ehdr ehdr; 666 GElf_Shdr shdr; 667 Elf_Data *build_id_data; 668 Elf_Scn *sec; 669 char *build_id = NULL, *bid; 670 unsigned char *raw; 671 Elf *elf; 672 int fd = open(self->name, O_RDONLY); 673 674 if (fd < 0) 675 goto out; 676 677 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); 678 if (elf == NULL) { 679 if (verbose) 680 fprintf(stderr, "%s: cannot read %s ELF file.\n", 681 __func__, self->name); 682 goto out_close; 683 } 684 685 if (gelf_getehdr(elf, &ehdr) == NULL) { 686 if (verbose) 687 fprintf(stderr, "%s: cannot get elf header.\n", __func__); 688 goto out_elf_end; 689 } 690 691 sec = elf_section_by_name(elf, &ehdr, &shdr, ".note.gnu.build-id", NULL); 692 if (sec == NULL) 693 goto out_elf_end; 694 695 build_id_data = elf_getdata(sec, NULL); 696 if (build_id_data == NULL) 697 goto out_elf_end; 698 build_id = malloc(BUILD_ID_SIZE); 699 if (build_id == NULL) 700 goto out_elf_end; 701 raw = build_id_data->d_buf + 16; 702 bid = build_id; 703 704 for (i = 0; i < 20; ++i) { 705 sprintf(bid, "%02x", *raw); 706 ++raw; 707 bid += 2; 708 } 709 if (verbose >= 2) 710 printf("%s(%s): %s\n", __func__, self->name, build_id); 711 out_elf_end: 712 elf_end(elf); 713 out_close: 714 close(fd); 715 out: 716 return build_id; 717 } 718 719 char dso__symtab_origin(const struct dso *self) 720 { 721 static const char origin[] = { 722 [DSO__ORIG_KERNEL] = 'k', 723 [DSO__ORIG_JAVA_JIT] = 'j', 724 [DSO__ORIG_FEDORA] = 'f', 725 [DSO__ORIG_UBUNTU] = 'u', 726 [DSO__ORIG_BUILDID] = 'b', 727 [DSO__ORIG_DSO] = 'd', 728 }; 729 730 if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND) 731 return '!'; 732 return origin[self->origin]; 733 } 734 735 int dso__load(struct dso *self, symbol_filter_t filter, int verbose) 736 { 737 int size = PATH_MAX; 738 char *name = malloc(size), *build_id = NULL; 739 int ret = -1; 740 int fd; 741 742 if (!name) 743 return -1; 744 745 self->adjust_symbols = 0; 746 747 if (strncmp(self->name, "/tmp/perf-", 10) == 0) { 748 ret = dso__load_perf_map(self, filter, verbose); 749 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT : 750 DSO__ORIG_NOT_FOUND; 751 return ret; 752 } 753 754 self->origin = DSO__ORIG_FEDORA - 1; 755 756 more: 757 do { 758 self->origin++; 759 switch (self->origin) { 760 case DSO__ORIG_FEDORA: 761 snprintf(name, size, "/usr/lib/debug%s.debug", self->name); 762 break; 763 case DSO__ORIG_UBUNTU: 764 snprintf(name, size, "/usr/lib/debug%s", self->name); 765 break; 766 case DSO__ORIG_BUILDID: 767 build_id = dso__read_build_id(self, verbose); 768 if (build_id != NULL) { 769 snprintf(name, size, 770 "/usr/lib/debug/.build-id/%.2s/%s.debug", 771 build_id, build_id + 2); 772 free(build_id); 773 break; 774 } 775 self->origin++; 776 /* Fall thru */ 777 case DSO__ORIG_DSO: 778 snprintf(name, size, "%s", self->name); 779 break; 780 781 default: 782 goto out; 783 } 784 785 fd = open(name, O_RDONLY); 786 } while (fd < 0); 787 788 ret = dso__load_sym(self, fd, name, filter, verbose, NULL); 789 close(fd); 790 791 /* 792 * Some people seem to have debuginfo files _WITHOUT_ debug info!?!? 793 */ 794 if (!ret) 795 goto more; 796 797 if (ret > 0) { 798 int nr_plt = dso__synthesize_plt_symbols(self, verbose); 799 if (nr_plt > 0) 800 ret += nr_plt; 801 } 802 out: 803 free(name); 804 if (ret < 0 && strstr(self->name, " (deleted)") != NULL) 805 return 0; 806 return ret; 807 } 808 809 static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name, 810 symbol_filter_t filter, int verbose) 811 { 812 struct module *mod = mod_dso__find_module(mods, name); 813 int err = 0, fd; 814 815 if (mod == NULL || !mod->active) 816 return err; 817 818 fd = open(mod->path, O_RDONLY); 819 820 if (fd < 0) 821 return err; 822 823 err = dso__load_sym(self, fd, name, filter, verbose, mod); 824 close(fd); 825 826 return err; 827 } 828 829 int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose) 830 { 831 struct mod_dso *mods = mod_dso__new_dso("modules"); 832 struct module *pos; 833 struct rb_node *next; 834 int err; 835 836 err = mod_dso__load_modules(mods); 837 838 if (err <= 0) 839 return err; 840 841 /* 842 * Iterate over modules, and load active symbols. 843 */ 844 next = rb_first(&mods->mods); 845 while (next) { 846 pos = rb_entry(next, struct module, rb_node); 847 err = dso__load_module(self, mods, pos->name, filter, verbose); 848 849 if (err < 0) 850 break; 851 852 next = rb_next(&pos->rb_node); 853 } 854 855 if (err < 0) { 856 mod_dso__delete_modules(mods); 857 mod_dso__delete_self(mods); 858 } 859 860 return err; 861 } 862 863 static inline void dso__fill_symbol_holes(struct dso *self) 864 { 865 struct symbol *prev = NULL; 866 struct rb_node *nd; 867 868 for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) { 869 struct symbol *pos = rb_entry(nd, struct symbol, rb_node); 870 871 if (prev) { 872 u64 hole = 0; 873 int alias = pos->start == prev->start; 874 875 if (!alias) 876 hole = prev->start - pos->end - 1; 877 878 if (hole || alias) { 879 if (alias) 880 pos->end = prev->end; 881 else if (hole) 882 pos->end = prev->start - 1; 883 } 884 } 885 prev = pos; 886 } 887 } 888 889 static int dso__load_vmlinux(struct dso *self, const char *vmlinux, 890 symbol_filter_t filter, int verbose) 891 { 892 int err, fd = open(vmlinux, O_RDONLY); 893 894 if (fd < 0) 895 return -1; 896 897 err = dso__load_sym(self, fd, vmlinux, filter, verbose, NULL); 898 899 if (err > 0) 900 dso__fill_symbol_holes(self); 901 902 close(fd); 903 904 return err; 905 } 906 907 int dso__load_kernel(struct dso *self, const char *vmlinux, 908 symbol_filter_t filter, int verbose, int modules) 909 { 910 int err = -1; 911 912 if (vmlinux) { 913 err = dso__load_vmlinux(self, vmlinux, filter, verbose); 914 if (err > 0 && modules) 915 err = dso__load_modules(self, filter, verbose); 916 } 917 918 if (err <= 0) 919 err = dso__load_kallsyms(self, filter, verbose); 920 921 if (err > 0) 922 self->origin = DSO__ORIG_KERNEL; 923 924 return err; 925 } 926 927 void symbol__init(void) 928 { 929 elf_version(EV_CURRENT); 930 } 931