14 char *bfd_demangle(void __used *v, const char __used *c, int __used i)
20 const char *sym_hist_filter;
23 #define DMGL_PARAMS (1 << 0) /* Include function args */
24 #define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
37 static struct symbol *symbol__new(u64 start, u64 len,
38 const char *name, unsigned int priv_size,
39 u64 obj_start, int verbose)
41 size_t namelen = strlen(name) + 1;
42 struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen);
48 printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n",
49 (u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start);
51 self->obj_start= obj_start;
55 if (sym_hist_filter && !strcmp(name, sym_hist_filter))
56 self->hist = calloc(sizeof(u64), len);
59 memset(self, 0, priv_size);
60 self = ((void *)self) + priv_size;
63 self->end = len ? start + len - 1 : start;
64 memcpy(self->name, name, namelen);
69 static void symbol__delete(struct symbol *self, unsigned int priv_size)
71 free(((void *)self) - priv_size);
74 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
77 return fprintf(fp, " %llx-%llx %s\n",
78 self->start, self->end, self->name);
80 return fprintf(fp, " %llx-%llx %s \t[%s]\n",
81 self->start, self->end, self->name, self->module->name);
84 struct dso *dso__new(const char *name, unsigned int sym_priv_size)
86 struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
89 strcpy(self->name, name);
91 self->sym_priv_size = sym_priv_size;
92 self->find_symbol = dso__find_symbol;
93 self->slen_calculated = 0;
94 self->origin = DSO__ORIG_NOT_FOUND;
100 static void dso__delete_symbols(struct dso *self)
103 struct rb_node *next = rb_first(&self->syms);
106 pos = rb_entry(next, struct symbol, rb_node);
107 next = rb_next(&pos->rb_node);
108 rb_erase(&pos->rb_node, &self->syms);
109 symbol__delete(pos, self->sym_priv_size);
113 void dso__delete(struct dso *self)
115 dso__delete_symbols(self);
119 static void dso__insert_symbol(struct dso *self, struct symbol *sym)
121 struct rb_node **p = &self->syms.rb_node;
122 struct rb_node *parent = NULL;
123 const u64 ip = sym->start;
128 s = rb_entry(parent, struct symbol, rb_node);
134 rb_link_node(&sym->rb_node, parent, p);
135 rb_insert_color(&sym->rb_node, &self->syms);
138 struct symbol *dso__find_symbol(struct dso *self, u64 ip)
145 n = self->syms.rb_node;
148 struct symbol *s = rb_entry(n, struct symbol, rb_node);
152 else if (ip > s->end)
161 size_t dso__fprintf(struct dso *self, FILE *fp)
163 size_t ret = fprintf(fp, "dso: %s\n", self->name);
166 for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
167 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
168 ret += symbol__fprintf(pos, fp);
174 static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int verbose)
176 struct rb_node *nd, *prevnd;
179 FILE *file = fopen("/proc/kallsyms", "r");
185 while (!feof(file)) {
191 line_len = getline(&line, &n, file);
198 line[--line_len] = '\0'; /* \n */
200 len = hex2u64(line, &start);
203 if (len + 2 >= line_len)
206 symbol_type = toupper(line[len]);
208 * We're interested only in code ('T'ext)
210 if (symbol_type != 'T' && symbol_type != 'W')
213 * Well fix up the end later, when we have all sorted.
215 sym = symbol__new(start, 0xdead, line + len + 2,
216 self->sym_priv_size, 0, verbose);
219 goto out_delete_line;
221 if (filter && filter(self, sym))
222 symbol__delete(sym, self->sym_priv_size);
224 dso__insert_symbol(self, sym);
230 * Now that we have all sorted out, just set the ->end of all
233 prevnd = rb_first(&self->syms);
236 goto out_delete_line;
238 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
239 struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
240 *curr = rb_entry(nd, struct symbol, rb_node);
242 prev->end = curr->start - 1;
257 static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int verbose)
264 file = fopen(self->name, "r");
268 while (!feof(file)) {
273 line_len = getline(&line, &n, file);
280 line[--line_len] = '\0'; /* \n */
282 len = hex2u64(line, &start);
285 if (len + 2 >= line_len)
288 len += hex2u64(line + len, &size);
291 if (len + 2 >= line_len)
294 sym = symbol__new(start, size, line + len,
295 self->sym_priv_size, start, verbose);
298 goto out_delete_line;
300 if (filter && filter(self, sym))
301 symbol__delete(sym, self->sym_priv_size);
303 dso__insert_symbol(self, sym);
320 * elf_symtab__for_each_symbol - iterate thru all the symbols
322 * @self: struct elf_symtab instance to iterate
323 * @index: uint32_t index
324 * @sym: GElf_Sym iterator
326 #define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \
327 for (index = 0, gelf_getsym(syms, index, &sym);\
329 index++, gelf_getsym(syms, index, &sym))
331 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
333 return GELF_ST_TYPE(sym->st_info);
336 static inline int elf_sym__is_function(const GElf_Sym *sym)
338 return elf_sym__type(sym) == STT_FUNC &&
340 sym->st_shndx != SHN_UNDEF &&
344 static inline int elf_sym__is_label(const GElf_Sym *sym)
346 return elf_sym__type(sym) == STT_NOTYPE &&
348 sym->st_shndx != SHN_UNDEF &&
349 sym->st_shndx != SHN_ABS;
352 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
353 const Elf_Data *secstrs)
355 return secstrs->d_buf + shdr->sh_name;
358 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
359 const Elf_Data *secstrs)
361 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
364 static inline const char *elf_sym__name(const GElf_Sym *sym,
365 const Elf_Data *symstrs)
367 return symstrs->d_buf + sym->st_name;
370 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
371 GElf_Shdr *shp, const char *name,
377 while ((sec = elf_nextscn(elf, sec)) != NULL) {
380 gelf_getshdr(sec, shp);
381 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
382 if (!strcmp(name, str)) {
393 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
394 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
396 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
398 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
399 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
401 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
404 * We need to check if we have a .dynsym, so that we can handle the
405 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
406 * .dynsym or .symtab).
407 * And always look at the original dso, not at debuginfo packages, that
408 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
410 static int dso__synthesize_plt_symbols(struct dso *self, int verbose)
412 uint32_t nr_rel_entries, idx;
417 GElf_Shdr shdr_rel_plt, shdr_dynsym;
418 Elf_Data *reldata, *syms, *symstrs;
419 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
422 char sympltname[1024];
424 int nr = 0, symidx, fd, err = 0;
426 fd = open(self->name, O_RDONLY);
430 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
434 if (gelf_getehdr(elf, &ehdr) == NULL)
437 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
438 ".dynsym", &dynsym_idx);
439 if (scn_dynsym == NULL)
442 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
444 if (scn_plt_rel == NULL) {
445 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
447 if (scn_plt_rel == NULL)
453 if (shdr_rel_plt.sh_link != dynsym_idx)
456 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
460 * Fetch the relocation section to find the indexes to the GOT
461 * and the symbols in the .dynsym they refer to.
463 reldata = elf_getdata(scn_plt_rel, NULL);
467 syms = elf_getdata(scn_dynsym, NULL);
471 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
472 if (scn_symstrs == NULL)
475 symstrs = elf_getdata(scn_symstrs, NULL);
479 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
480 plt_offset = shdr_plt.sh_offset;
482 if (shdr_rel_plt.sh_type == SHT_RELA) {
483 GElf_Rela pos_mem, *pos;
485 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
487 symidx = GELF_R_SYM(pos->r_info);
488 plt_offset += shdr_plt.sh_entsize;
489 gelf_getsym(syms, symidx, &sym);
490 snprintf(sympltname, sizeof(sympltname),
491 "%s@plt", elf_sym__name(&sym, symstrs));
493 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
494 sympltname, self->sym_priv_size, 0, verbose);
498 dso__insert_symbol(self, f);
501 } else if (shdr_rel_plt.sh_type == SHT_REL) {
502 GElf_Rel pos_mem, *pos;
503 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
505 symidx = GELF_R_SYM(pos->r_info);
506 plt_offset += shdr_plt.sh_entsize;
507 gelf_getsym(syms, symidx, &sym);
508 snprintf(sympltname, sizeof(sympltname),
509 "%s@plt", elf_sym__name(&sym, symstrs));
511 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
512 sympltname, self->sym_priv_size, 0, verbose);
516 dso__insert_symbol(self, f);
530 fprintf(stderr, "%s: problems reading %s PLT info.\n",
531 __func__, self->name);
535 static int dso__load_sym(struct dso *self, int fd, const char *name,
536 symbol_filter_t filter, int verbose, struct module *mod)
538 Elf_Data *symstrs, *secstrs;
546 Elf_Scn *sec, *sec_strndx;
548 int nr = 0, kernel = !strcmp("[kernel]", self->name);
550 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
553 fprintf(stderr, "%s: cannot read %s ELF file.\n",
558 if (gelf_getehdr(elf, &ehdr) == NULL) {
560 fprintf(stderr, "%s: cannot get elf header.\n", __func__);
564 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
566 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
571 syms = elf_getdata(sec, NULL);
575 sec = elf_getscn(elf, shdr.sh_link);
579 symstrs = elf_getdata(sec, NULL);
583 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
584 if (sec_strndx == NULL)
587 secstrs = elf_getdata(sec_strndx, NULL);
591 nr_syms = shdr.sh_size / shdr.sh_entsize;
593 memset(&sym, 0, sizeof(sym));
595 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
596 elf_section_by_name(elf, &ehdr, &shdr,
599 } else self->adjust_symbols = 0;
601 elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
606 struct section *section = NULL;
607 int is_label = elf_sym__is_label(&sym);
608 const char *section_name;
610 if (!is_label && !elf_sym__is_function(&sym))
613 sec = elf_getscn(elf, sym.st_shndx);
617 gelf_getshdr(sec, &shdr);
619 if (is_label && !elf_sec__is_text(&shdr, secstrs))
622 section_name = elf_sec__name(&shdr, secstrs);
623 obj_start = sym.st_value;
625 if (self->adjust_symbols) {
627 printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n",
628 (u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset);
630 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
634 section = mod->sections->find_section(mod->sections, section_name);
636 sym.st_value += section->vma;
638 fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n",
639 mod->name, section_name);
644 * We need to figure out if the object was created from C++ sources
645 * DWARF DW_compile_unit has this, but we don't always have access
648 name = elf_sym__name(&sym, symstrs);
649 demangled = bfd_demangle(NULL, name, DMGL_PARAMS | DMGL_ANSI);
650 if (demangled != NULL)
653 f = symbol__new(sym.st_value, sym.st_size, name,
654 self->sym_priv_size, obj_start, verbose);
659 if (filter && filter(self, f))
660 symbol__delete(f, self->sym_priv_size);
663 dso__insert_symbol(self, f);
675 #define BUILD_ID_SIZE 128
677 static char *dso__read_build_id(struct dso *self, int verbose)
682 Elf_Data *build_id_data;
684 char *build_id = NULL, *bid;
687 int fd = open(self->name, O_RDONLY);
692 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
695 fprintf(stderr, "%s: cannot read %s ELF file.\n",
696 __func__, self->name);
700 if (gelf_getehdr(elf, &ehdr) == NULL) {
702 fprintf(stderr, "%s: cannot get elf header.\n", __func__);
706 sec = elf_section_by_name(elf, &ehdr, &shdr, ".note.gnu.build-id", NULL);
710 build_id_data = elf_getdata(sec, NULL);
711 if (build_id_data == NULL)
713 build_id = malloc(BUILD_ID_SIZE);
714 if (build_id == NULL)
716 raw = build_id_data->d_buf + 16;
719 for (i = 0; i < 20; ++i) {
720 sprintf(bid, "%02x", *raw);
725 printf("%s(%s): %s\n", __func__, self->name, build_id);
734 char dso__symtab_origin(const struct dso *self)
736 static const char origin[] = {
737 [DSO__ORIG_KERNEL] = 'k',
738 [DSO__ORIG_JAVA_JIT] = 'j',
739 [DSO__ORIG_FEDORA] = 'f',
740 [DSO__ORIG_UBUNTU] = 'u',
741 [DSO__ORIG_BUILDID] = 'b',
742 [DSO__ORIG_DSO] = 'd',
745 if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
747 return origin[self->origin];
750 int dso__load(struct dso *self, symbol_filter_t filter, int verbose)
753 char *name = malloc(size), *build_id = NULL;
760 self->adjust_symbols = 0;
762 if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
763 ret = dso__load_perf_map(self, filter, verbose);
764 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
769 self->origin = DSO__ORIG_FEDORA - 1;
774 switch (self->origin) {
775 case DSO__ORIG_FEDORA:
776 snprintf(name, size, "/usr/lib/debug%s.debug", self->name);
778 case DSO__ORIG_UBUNTU:
779 snprintf(name, size, "/usr/lib/debug%s", self->name);
781 case DSO__ORIG_BUILDID:
782 build_id = dso__read_build_id(self, verbose);
783 if (build_id != NULL) {
785 "/usr/lib/debug/.build-id/%.2s/%s.debug",
786 build_id, build_id + 2);
793 snprintf(name, size, "%s", self->name);
800 fd = open(name, O_RDONLY);
803 ret = dso__load_sym(self, fd, name, filter, verbose, NULL);
807 * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
813 int nr_plt = dso__synthesize_plt_symbols(self, verbose);
822 static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
823 symbol_filter_t filter, int verbose)
825 struct module *mod = mod_dso__find_module(mods, name);
828 if (mod == NULL || !mod->active)
831 fd = open(mod->path, O_RDONLY);
836 err = dso__load_sym(self, fd, name, filter, verbose, mod);
842 int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose)
844 struct mod_dso *mods = mod_dso__new_dso("modules");
846 struct rb_node *next;
849 err = mod_dso__load_modules(mods);
855 * Iterate over modules, and load active symbols.
857 next = rb_first(&mods->mods);
859 pos = rb_entry(next, struct module, rb_node);
860 err = dso__load_module(self, mods, pos->name, filter, verbose);
865 next = rb_next(&pos->rb_node);
869 mod_dso__delete_modules(mods);
870 mod_dso__delete_self(mods);
876 static inline void dso__fill_symbol_holes(struct dso *self)
878 struct symbol *prev = NULL;
881 for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) {
882 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
886 int alias = pos->start == prev->start;
889 hole = prev->start - pos->end - 1;
893 pos->end = prev->end;
895 pos->end = prev->start - 1;
902 static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
903 symbol_filter_t filter, int verbose)
905 int err, fd = open(vmlinux, O_RDONLY);
910 err = dso__load_sym(self, fd, vmlinux, filter, verbose, NULL);
913 dso__fill_symbol_holes(self);
920 int dso__load_kernel(struct dso *self, const char *vmlinux,
921 symbol_filter_t filter, int verbose, int modules)
926 err = dso__load_vmlinux(self, vmlinux, filter, verbose);
927 if (err > 0 && modules)
928 err = dso__load_modules(self, filter, verbose);
932 err = dso__load_kallsyms(self, filter, verbose);
935 self->origin = DSO__ORIG_KERNEL;
941 struct dso *kernel_dso;
943 struct dso *hypervisor_dso;
945 char *vmlinux = "vmlinux";
948 static void dsos__add(struct dso *dso)
950 list_add_tail(&dso->node, &dsos);
953 static struct dso *dsos__find(const char *name)
957 list_for_each_entry(pos, &dsos, node)
958 if (strcmp(pos->name, name) == 0)
963 struct dso *dsos__findnew(const char *name)
965 struct dso *dso = dsos__find(name);
971 dso = dso__new(name, 0);
975 nr = dso__load(dso, NULL, verbose);
977 eprintf("Failed to open: %s\n", name);
981 eprintf("No symbols found in: %s, maybe install a debug package?\n", name);
992 void dsos__fprintf(FILE *fp)
996 list_for_each_entry(pos, &dsos, node)
997 dso__fprintf(pos, fp);
1000 static struct symbol *vdso__find_symbol(struct dso *dso, u64 ip)
1002 return dso__find_symbol(dso, ip);
1005 int load_kernel(void)
1009 kernel_dso = dso__new("[kernel]", 0);
1013 err = dso__load_kernel(kernel_dso, vmlinux, NULL, verbose, modules);
1015 dso__delete(kernel_dso);
1018 dsos__add(kernel_dso);
1020 vdso = dso__new("[vdso]", 0);
1024 vdso->find_symbol = vdso__find_symbol;
1028 hypervisor_dso = dso__new("[hypervisor]", 0);
1029 if (!hypervisor_dso)
1031 dsos__add(hypervisor_dso);
1037 void symbol__init(void)
1039 elf_version(EV_CURRENT);