| #include "util.h" |
| #include "../perf.h" |
| #include "session.h" |
| #include "sort.h" |
| #include "string.h" |
| #include "symbol.h" |
| #include "thread.h" |
| |
| #include "debug.h" |
| |
| #include <asm/bug.h> |
| #include <libelf.h> |
| #include <gelf.h> |
| #include <elf.h> |
| #include <limits.h> |
| #include <sys/utsname.h> |
| |
| #ifndef NT_GNU_BUILD_ID |
| #define NT_GNU_BUILD_ID 3 |
| #endif |
| |
| enum dso_origin { |
| DSO__ORIG_KERNEL = 0, |
| DSO__ORIG_JAVA_JIT, |
| DSO__ORIG_BUILD_ID_CACHE, |
| DSO__ORIG_FEDORA, |
| DSO__ORIG_UBUNTU, |
| DSO__ORIG_BUILDID, |
| DSO__ORIG_DSO, |
| DSO__ORIG_KMODULE, |
| DSO__ORIG_NOT_FOUND, |
| }; |
| |
| static void dsos__add(struct list_head *head, struct dso *dso); |
| static struct map *map__new2(u64 start, struct dso *dso, enum map_type type); |
| static int dso__load_kernel_sym(struct dso *self, struct map *map, |
| struct perf_session *session, symbol_filter_t filter); |
| static int vmlinux_path__nr_entries; |
| static char **vmlinux_path; |
| |
| struct symbol_conf symbol_conf = { |
| .exclude_other = true, |
| .use_modules = true, |
| .try_vmlinux_path = true, |
| }; |
| |
| bool dso__loaded(const struct dso *self, enum map_type type) |
| { |
| return self->loaded & (1 << type); |
| } |
| |
| bool dso__sorted_by_name(const struct dso *self, enum map_type type) |
| { |
| return self->sorted_by_name & (1 << type); |
| } |
| |
| static void dso__set_loaded(struct dso *self, enum map_type type) |
| { |
| self->loaded |= (1 << type); |
| } |
| |
| static void dso__set_sorted_by_name(struct dso *self, enum map_type type) |
| { |
| self->sorted_by_name |= (1 << type); |
| } |
| |
| bool symbol_type__is_a(char symbol_type, enum map_type map_type) |
| { |
| switch (map_type) { |
| case MAP__FUNCTION: |
| return symbol_type == 'T' || symbol_type == 'W'; |
| case MAP__VARIABLE: |
| return symbol_type == 'D' || symbol_type == 'd'; |
| default: |
| return false; |
| } |
| } |
| |
| static void symbols__fixup_end(struct rb_root *self) |
| { |
| struct rb_node *nd, *prevnd = rb_first(self); |
| struct symbol *curr, *prev; |
| |
| if (prevnd == NULL) |
| return; |
| |
| curr = rb_entry(prevnd, struct symbol, rb_node); |
| |
| for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { |
| prev = curr; |
| curr = rb_entry(nd, struct symbol, rb_node); |
| |
| if (prev->end == prev->start) |
| prev->end = curr->start - 1; |
| } |
| |
| /* Last entry */ |
| if (curr->end == curr->start) |
| curr->end = roundup(curr->start, 4096); |
| } |
| |
| static void __map_groups__fixup_end(struct map_groups *self, enum map_type type) |
| { |
| struct map *prev, *curr; |
| struct rb_node *nd, *prevnd = rb_first(&self->maps[type]); |
| |
| if (prevnd == NULL) |
| return; |
| |
| curr = rb_entry(prevnd, struct map, rb_node); |
| |
| for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { |
| prev = curr; |
| curr = rb_entry(nd, struct map, rb_node); |
| prev->end = curr->start - 1; |
| } |
| |
| /* |
| * We still haven't the actual symbols, so guess the |
| * last map final address. |
| */ |
| curr->end = ~0UL; |
| } |
| |
| static void map_groups__fixup_end(struct map_groups *self) |
| { |
| int i; |
| for (i = 0; i < MAP__NR_TYPES; ++i) |
| __map_groups__fixup_end(self, i); |
| } |
| |
| static struct symbol *symbol__new(u64 start, u64 len, const char *name) |
| { |
| size_t namelen = strlen(name) + 1; |
| struct symbol *self = zalloc(symbol_conf.priv_size + |
| sizeof(*self) + namelen); |
| if (self == NULL) |
| return NULL; |
| |
| if (symbol_conf.priv_size) |
| self = ((void *)self) + symbol_conf.priv_size; |
| |
| self->start = start; |
| self->end = len ? start + len - 1 : start; |
| |
| pr_debug3("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end); |
| |
| memcpy(self->name, name, namelen); |
| |
| return self; |
| } |
| |
| static void symbol__delete(struct symbol *self) |
| { |
| free(((void *)self) - symbol_conf.priv_size); |
| } |
| |
| static size_t symbol__fprintf(struct symbol *self, FILE *fp) |
| { |
| return fprintf(fp, " %llx-%llx %s\n", |
| self->start, self->end, self->name); |
| } |
| |
| void dso__set_long_name(struct dso *self, char *name) |
| { |
| if (name == NULL) |
| return; |
| self->long_name = name; |
| self->long_name_len = strlen(name); |
| } |
| |
| static void dso__set_basename(struct dso *self) |
| { |
| self->short_name = basename(self->long_name); |
| } |
| |
| struct dso *dso__new(const char *name) |
| { |
| struct dso *self = zalloc(sizeof(*self) + strlen(name) + 1); |
| |
| if (self != NULL) { |
| int i; |
| strcpy(self->name, name); |
| dso__set_long_name(self, self->name); |
| self->short_name = self->name; |
| for (i = 0; i < MAP__NR_TYPES; ++i) |
| self->symbols[i] = self->symbol_names[i] = RB_ROOT; |
| self->slen_calculated = 0; |
| self->origin = DSO__ORIG_NOT_FOUND; |
| self->loaded = 0; |
| self->sorted_by_name = 0; |
| self->has_build_id = 0; |
| } |
| |
| return self; |
| } |
| |
| static void symbols__delete(struct rb_root *self) |
| { |
| struct symbol *pos; |
| struct rb_node *next = rb_first(self); |
| |
| while (next) { |
| pos = rb_entry(next, struct symbol, rb_node); |
| next = rb_next(&pos->rb_node); |
| rb_erase(&pos->rb_node, self); |
| symbol__delete(pos); |
| } |
| } |
| |
| void dso__delete(struct dso *self) |
| { |
| int i; |
| for (i = 0; i < MAP__NR_TYPES; ++i) |
| symbols__delete(&self->symbols[i]); |
| if (self->long_name != self->name) |
| free(self->long_name); |
| free(self); |
| } |
| |
| void dso__set_build_id(struct dso *self, void *build_id) |
| { |
| memcpy(self->build_id, build_id, sizeof(self->build_id)); |
| self->has_build_id = 1; |
| } |
| |
| static void symbols__insert(struct rb_root *self, struct symbol *sym) |
| { |
| struct rb_node **p = &self->rb_node; |
| struct rb_node *parent = NULL; |
| const u64 ip = sym->start; |
| struct symbol *s; |
| |
| while (*p != NULL) { |
| parent = *p; |
| s = rb_entry(parent, struct symbol, rb_node); |
| if (ip < s->start) |
| p = &(*p)->rb_left; |
| else |
| p = &(*p)->rb_right; |
| } |
| rb_link_node(&sym->rb_node, parent, p); |
| rb_insert_color(&sym->rb_node, self); |
| } |
| |
| static struct symbol *symbols__find(struct rb_root *self, u64 ip) |
| { |
| struct rb_node *n; |
| |
| if (self == NULL) |
| return NULL; |
| |
| n = self->rb_node; |
| |
| while (n) { |
| struct symbol *s = rb_entry(n, struct symbol, rb_node); |
| |
| if (ip < s->start) |
| n = n->rb_left; |
| else if (ip > s->end) |
| n = n->rb_right; |
| else |
| return s; |
| } |
| |
| return NULL; |
| } |
| |
| struct symbol_name_rb_node { |
| struct rb_node rb_node; |
| struct symbol sym; |
| }; |
| |
| static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym) |
| { |
| struct rb_node **p = &self->rb_node; |
| struct rb_node *parent = NULL; |
| struct symbol_name_rb_node *symn = ((void *)sym) - sizeof(*parent), *s; |
| |
| while (*p != NULL) { |
| parent = *p; |
| s = rb_entry(parent, struct symbol_name_rb_node, rb_node); |
| if (strcmp(sym->name, s->sym.name) < 0) |
| p = &(*p)->rb_left; |
| else |
| p = &(*p)->rb_right; |
| } |
| rb_link_node(&symn->rb_node, parent, p); |
| rb_insert_color(&symn->rb_node, self); |
| } |
| |
| static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source) |
| { |
| struct rb_node *nd; |
| |
| for (nd = rb_first(source); nd; nd = rb_next(nd)) { |
| struct symbol *pos = rb_entry(nd, struct symbol, rb_node); |
| symbols__insert_by_name(self, pos); |
| } |
| } |
| |
| static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name) |
| { |
| struct rb_node *n; |
| |
| if (self == NULL) |
| return NULL; |
| |
| n = self->rb_node; |
| |
| while (n) { |
| struct symbol_name_rb_node *s; |
| int cmp; |
| |
| s = rb_entry(n, struct symbol_name_rb_node, rb_node); |
| cmp = strcmp(name, s->sym.name); |
| |
| if (cmp < 0) |
| n = n->rb_left; |
| else if (cmp > 0) |
| n = n->rb_right; |
| else |
| return &s->sym; |
| } |
| |
| return NULL; |
| } |
| |
| struct symbol *dso__find_symbol(struct dso *self, |
| enum map_type type, u64 addr) |
| { |
| return symbols__find(&self->symbols[type], addr); |
| } |
| |
| struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type, |
| const char *name) |
| { |
| return symbols__find_by_name(&self->symbol_names[type], name); |
| } |
| |
| void dso__sort_by_name(struct dso *self, enum map_type type) |
| { |
| dso__set_sorted_by_name(self, type); |
| return symbols__sort_by_name(&self->symbol_names[type], |
| &self->symbols[type]); |
| } |
| |
| int build_id__sprintf(const u8 *self, int len, char *bf) |
| { |
| char *bid = bf; |
| const u8 *raw = self; |
| int i; |
| |
| for (i = 0; i < len; ++i) { |
| sprintf(bid, "%02x", *raw); |
| ++raw; |
| bid += 2; |
| } |
| |
| return raw - self; |
| } |
| |
| size_t dso__fprintf_buildid(struct dso *self, FILE *fp) |
| { |
| char sbuild_id[BUILD_ID_SIZE * 2 + 1]; |
| |
| build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id); |
| return fprintf(fp, "%s", sbuild_id); |
| } |
| |
| size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp) |
| { |
| struct rb_node *nd; |
| size_t ret = fprintf(fp, "dso: %s (", self->short_name); |
| |
| ret += dso__fprintf_buildid(self, fp); |
| ret += fprintf(fp, ")\n"); |
| for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) { |
| struct symbol *pos = rb_entry(nd, struct symbol, rb_node); |
| ret += symbol__fprintf(pos, fp); |
| } |
| |
| return ret; |
| } |
| |
| int kallsyms__parse(const char *filename, void *arg, |
| int (*process_symbol)(void *arg, const char *name, |
| char type, u64 start)) |
| { |
| char *line = NULL; |
| size_t n; |
| int err = 0; |
| FILE *file = fopen(filename, "r"); |
| |
| if (file == NULL) |
| goto out_failure; |
| |
| while (!feof(file)) { |
| u64 start; |
| int line_len, len; |
| char symbol_type; |
| char *symbol_name; |
| |
| line_len = getline(&line, &n, file); |
| if (line_len < 0) |
| break; |
| |
| if (!line) |
| goto out_failure; |
| |
| line[--line_len] = '\0'; /* \n */ |
| |
| len = hex2u64(line, &start); |
| |
| len++; |
| if (len + 2 >= line_len) |
| continue; |
| |
| symbol_type = toupper(line[len]); |
| symbol_name = line + len + 2; |
| |
| err = process_symbol(arg, symbol_name, symbol_type, start); |
| if (err) |
| break; |
| } |
| |
| free(line); |
| fclose(file); |
| return err; |
| |
| out_failure: |
| return -1; |
| } |
| |
| struct process_kallsyms_args { |
| struct map *map; |
| struct dso *dso; |
| }; |
| |
| static int map__process_kallsym_symbol(void *arg, const char *name, |
| char type, u64 start) |
| { |
| struct symbol *sym; |
| struct process_kallsyms_args *a = arg; |
| struct rb_root *root = &a->dso->symbols[a->map->type]; |
| |
| if (!symbol_type__is_a(type, a->map->type)) |
| return 0; |
| |
| /* |
| * Will fix up the end later, when we have all symbols sorted. |
| */ |
| sym = symbol__new(start, 0, name); |
| |
| if (sym == NULL) |
| return -ENOMEM; |
| /* |
| * We will pass the symbols to the filter later, in |
| * map__split_kallsyms, when we have split the maps per module |
| */ |
| symbols__insert(root, sym); |
| return 0; |
| } |
| |
| /* |
| * Loads the function entries in /proc/kallsyms into kernel_map->dso, |
| * so that we can in the next step set the symbol ->end address and then |
| * call kernel_maps__split_kallsyms. |
| */ |
| static int dso__load_all_kallsyms(struct dso *self, const char *filename, |
| struct map *map) |
| { |
| struct process_kallsyms_args args = { .map = map, .dso = self, }; |
| return kallsyms__parse(filename, &args, map__process_kallsym_symbol); |
| } |
| |
| /* |
| * Split the symbols into maps, making sure there are no overlaps, i.e. the |
| * kernel range is broken in several maps, named [kernel].N, as we don't have |
| * the original ELF section names vmlinux have. |
| */ |
| static int dso__split_kallsyms(struct dso *self, struct map *map, |
| struct perf_session *session, symbol_filter_t filter) |
| { |
| struct map *curr_map = map; |
| struct symbol *pos; |
| int count = 0; |
| struct rb_root *root = &self->symbols[map->type]; |
| struct rb_node *next = rb_first(root); |
| int kernel_range = 0; |
| |
| while (next) { |
| char *module; |
| |
| pos = rb_entry(next, struct symbol, rb_node); |
| next = rb_next(&pos->rb_node); |
| |
| module = strchr(pos->name, '\t'); |
| if (module) { |
| if (!symbol_conf.use_modules) |
| goto discard_symbol; |
| |
| *module++ = '\0'; |
| |
| if (strcmp(curr_map->dso->short_name, module)) { |
| curr_map = map_groups__find_by_name(&session->kmaps, map->type, module); |
| if (curr_map == NULL) { |
| pr_debug("/proc/{kallsyms,modules} " |
| "inconsistency while looking " |
| "for \"%s\" module!\n", module); |
| return -1; |
| } |
| |
| if (curr_map->dso->loaded) |
| goto discard_symbol; |
| } |
| /* |
| * So that we look just like we get from .ko files, |
| * i.e. not prelinked, relative to map->start. |
| */ |
| pos->start = curr_map->map_ip(curr_map, pos->start); |
| pos->end = curr_map->map_ip(curr_map, pos->end); |
| } else if (curr_map != map) { |
| char dso_name[PATH_MAX]; |
| struct dso *dso; |
| |
| snprintf(dso_name, sizeof(dso_name), "[kernel].%d", |
| kernel_range++); |
| |
| dso = dso__new(dso_name); |
| if (dso == NULL) |
| return -1; |
| |
| curr_map = map__new2(pos->start, dso, map->type); |
| if (map == NULL) { |
| dso__delete(dso); |
| return -1; |
| } |
| |
| curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; |
| map_groups__insert(&session->kmaps, curr_map); |
| ++kernel_range; |
| } |
| |
| if (filter && filter(curr_map, pos)) { |
| discard_symbol: rb_erase(&pos->rb_node, root); |
| symbol__delete(pos); |
| } else { |
| if (curr_map != map) { |
| rb_erase(&pos->rb_node, root); |
| symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); |
| } |
| count++; |
| } |
| } |
| |
| return count; |
| } |
| |
| |
| static int dso__load_kallsyms(struct dso *self, const char *filename, struct map *map, |
| struct perf_session *session, symbol_filter_t filter) |
| { |
| if (dso__load_all_kallsyms(self, filename, map) < 0) |
| return -1; |
| |
| symbols__fixup_end(&self->symbols[map->type]); |
| self->origin = DSO__ORIG_KERNEL; |
| |
| return dso__split_kallsyms(self, map, session, filter); |
| } |
| |
| static int dso__load_perf_map(struct dso *self, struct map *map, |
| symbol_filter_t filter) |
| { |
| char *line = NULL; |
| size_t n; |
| FILE *file; |
| int nr_syms = 0; |
| |
| file = fopen(self->long_name, "r"); |
| if (file == NULL) |
| goto out_failure; |
| |
| while (!feof(file)) { |
| u64 start, size; |
| struct symbol *sym; |
| int line_len, len; |
| |
| line_len = getline(&line, &n, file); |
| if (line_len < 0) |
| break; |
| |
| if (!line) |
| goto out_failure; |
| |
| line[--line_len] = '\0'; /* \n */ |
| |
| len = hex2u64(line, &start); |
| |
| len++; |
| if (len + 2 >= line_len) |
| continue; |
| |
| len += hex2u64(line + len, &size); |
| |
| len++; |
| if (len + 2 >= line_len) |
| continue; |
| |
| sym = symbol__new(start, size, line + len); |
| |
| if (sym == NULL) |
| goto out_delete_line; |
| |
| if (filter && filter(map, sym)) |
| symbol__delete(sym); |
| else { |
| symbols__insert(&self->symbols[map->type], sym); |
| nr_syms++; |
| } |
| } |
| |
| free(line); |
| fclose(file); |
| |
| return nr_syms; |
| |
| out_delete_line: |
| free(line); |
| out_failure: |
| return -1; |
| } |
| |
| /** |
| * elf_symtab__for_each_symbol - iterate thru all the symbols |
| * |
| * @self: struct elf_symtab instance to iterate |
| * @idx: uint32_t idx |
| * @sym: GElf_Sym iterator |
| */ |
| #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ |
| for (idx = 0, gelf_getsym(syms, idx, &sym);\ |
| idx < nr_syms; \ |
| idx++, gelf_getsym(syms, idx, &sym)) |
| |
| static inline uint8_t elf_sym__type(const GElf_Sym *sym) |
| { |
| return GELF_ST_TYPE(sym->st_info); |
| } |
| |
| static inline int elf_sym__is_function(const GElf_Sym *sym) |
| { |
| return elf_sym__type(sym) == STT_FUNC && |
| sym->st_name != 0 && |
| sym->st_shndx != SHN_UNDEF; |
| } |
| |
| static inline bool elf_sym__is_object(const GElf_Sym *sym) |
| { |
| return elf_sym__type(sym) == STT_OBJECT && |
| sym->st_name != 0 && |
| sym->st_shndx != SHN_UNDEF; |
| } |
| |
| static inline int elf_sym__is_label(const GElf_Sym *sym) |
| { |
| return elf_sym__type(sym) == STT_NOTYPE && |
| sym->st_name != 0 && |
| sym->st_shndx != SHN_UNDEF && |
| sym->st_shndx != SHN_ABS; |
| } |
| |
| static inline const char *elf_sec__name(const GElf_Shdr *shdr, |
| const Elf_Data *secstrs) |
| { |
| return secstrs->d_buf + shdr->sh_name; |
| } |
| |
| static inline int elf_sec__is_text(const GElf_Shdr *shdr, |
| const Elf_Data *secstrs) |
| { |
| return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; |
| } |
| |
| static inline bool elf_sec__is_data(const GElf_Shdr *shdr, |
| const Elf_Data *secstrs) |
| { |
| return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; |
| } |
| |
| static inline const char *elf_sym__name(const GElf_Sym *sym, |
| const Elf_Data *symstrs) |
| { |
| return symstrs->d_buf + sym->st_name; |
| } |
| |
| static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, |
| GElf_Shdr *shp, const char *name, |
| size_t *idx) |
| { |
| Elf_Scn *sec = NULL; |
| size_t cnt = 1; |
| |
| while ((sec = elf_nextscn(elf, sec)) != NULL) { |
| char *str; |
| |
| gelf_getshdr(sec, shp); |
| str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); |
| if (!strcmp(name, str)) { |
| if (idx) |
| *idx = cnt; |
| break; |
| } |
| ++cnt; |
| } |
| |
| return sec; |
| } |
| |
| #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ |
| for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ |
| idx < nr_entries; \ |
| ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) |
| |
| #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ |
| for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ |
| idx < nr_entries; \ |
| ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) |
| |
| /* |
| * We need to check if we have a .dynsym, so that we can handle the |
| * .plt, synthesizing its symbols, that aren't on the symtabs (be it |
| * .dynsym or .symtab). |
| * And always look at the original dso, not at debuginfo packages, that |
| * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). |
| */ |
| static int dso__synthesize_plt_symbols(struct dso *self, struct map *map, |
| symbol_filter_t filter) |
| { |
| uint32_t nr_rel_entries, idx; |
| GElf_Sym sym; |
| u64 plt_offset; |
| GElf_Shdr shdr_plt; |
| struct symbol *f; |
| GElf_Shdr shdr_rel_plt, shdr_dynsym; |
| Elf_Data *reldata, *syms, *symstrs; |
| Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; |
| size_t dynsym_idx; |
| GElf_Ehdr ehdr; |
| char sympltname[1024]; |
| Elf *elf; |
| int nr = 0, symidx, fd, err = 0; |
| |
| fd = open(self->long_name, O_RDONLY); |
| if (fd < 0) |
| goto out; |
| |
| elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| if (elf == NULL) |
| goto out_close; |
| |
| if (gelf_getehdr(elf, &ehdr) == NULL) |
| goto out_elf_end; |
| |
| scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym, |
| ".dynsym", &dynsym_idx); |
| if (scn_dynsym == NULL) |
| goto out_elf_end; |
| |
| scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
| ".rela.plt", NULL); |
| if (scn_plt_rel == NULL) { |
| scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
| ".rel.plt", NULL); |
| if (scn_plt_rel == NULL) |
| goto out_elf_end; |
| } |
| |
| err = -1; |
| |
| if (shdr_rel_plt.sh_link != dynsym_idx) |
| goto out_elf_end; |
| |
| if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) |
| goto out_elf_end; |
| |
| /* |
| * Fetch the relocation section to find the idxes to the GOT |
| * and the symbols in the .dynsym they refer to. |
| */ |
| reldata = elf_getdata(scn_plt_rel, NULL); |
| if (reldata == NULL) |
| goto out_elf_end; |
| |
| syms = elf_getdata(scn_dynsym, NULL); |
| if (syms == NULL) |
| goto out_elf_end; |
| |
| scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); |
| if (scn_symstrs == NULL) |
| goto out_elf_end; |
| |
| symstrs = elf_getdata(scn_symstrs, NULL); |
| if (symstrs == NULL) |
| goto out_elf_end; |
| |
| nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; |
| plt_offset = shdr_plt.sh_offset; |
| |
| if (shdr_rel_plt.sh_type == SHT_RELA) { |
| GElf_Rela pos_mem, *pos; |
| |
| elf_section__for_each_rela(reldata, pos, pos_mem, idx, |
| nr_rel_entries) { |
| symidx = GELF_R_SYM(pos->r_info); |
| plt_offset += shdr_plt.sh_entsize; |
| gelf_getsym(syms, symidx, &sym); |
| snprintf(sympltname, sizeof(sympltname), |
| "%s@plt", elf_sym__name(&sym, symstrs)); |
| |
| f = symbol__new(plt_offset, shdr_plt.sh_entsize, |
| sympltname); |
| if (!f) |
| goto out_elf_end; |
| |
| if (filter && filter(map, f)) |
| symbol__delete(f); |
| else { |
| symbols__insert(&self->symbols[map->type], f); |
| ++nr; |
| } |
| } |
| } else if (shdr_rel_plt.sh_type == SHT_REL) { |
| GElf_Rel pos_mem, *pos; |
| elf_section__for_each_rel(reldata, pos, pos_mem, idx, |
| nr_rel_entries) { |
| symidx = GELF_R_SYM(pos->r_info); |
| plt_offset += shdr_plt.sh_entsize; |
| gelf_getsym(syms, symidx, &sym); |
| snprintf(sympltname, sizeof(sympltname), |
| "%s@plt", elf_sym__name(&sym, symstrs)); |
| |
| f = symbol__new(plt_offset, shdr_plt.sh_entsize, |
| sympltname); |
| if (!f) |
| goto out_elf_end; |
| |
| if (filter && filter(map, f)) |
| symbol__delete(f); |
| else { |
| symbols__insert(&self->symbols[map->type], f); |
| ++nr; |
| } |
| } |
| } |
| |
| err = 0; |
| out_elf_end: |
| elf_end(elf); |
| out_close: |
| close(fd); |
| |
| if (err == 0) |
| return nr; |
| out: |
| pr_warning("%s: problems reading %s PLT info.\n", |
| __func__, self->long_name); |
| return 0; |
| } |
| |
| static bool elf_sym__is_a(GElf_Sym *self, enum map_type type) |
| { |
| switch (type) { |
| case MAP__FUNCTION: |
| return elf_sym__is_function(self); |
| case MAP__VARIABLE: |
| return elf_sym__is_object(self); |
| default: |
| return false; |
| } |
| } |
| |
| static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type) |
| { |
| switch (type) { |
| case MAP__FUNCTION: |
| return elf_sec__is_text(self, secstrs); |
| case MAP__VARIABLE: |
| return elf_sec__is_data(self, secstrs); |
| default: |
| return false; |
| } |
| } |
| |
| static int dso__load_sym(struct dso *self, struct map *map, |
| struct perf_session *session, const char *name, int fd, |
| symbol_filter_t filter, int kernel, int kmodule) |
| { |
| struct map *curr_map = map; |
| struct dso *curr_dso = self; |
| size_t dso_name_len = strlen(self->short_name); |
| Elf_Data *symstrs, *secstrs; |
| uint32_t nr_syms; |
| int err = -1; |
| uint32_t idx; |
| GElf_Ehdr ehdr; |
| GElf_Shdr shdr; |
| Elf_Data *syms; |
| GElf_Sym sym; |
| Elf_Scn *sec, *sec_strndx; |
| Elf *elf; |
| int nr = 0; |
| |
| elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| if (elf == NULL) { |
| pr_err("%s: cannot read %s ELF file.\n", __func__, name); |
| goto out_close; |
| } |
| |
| if (gelf_getehdr(elf, &ehdr) == NULL) { |
| pr_err("%s: cannot get elf header.\n", __func__); |
| goto out_elf_end; |
| } |
| |
| sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL); |
| if (sec == NULL) { |
| sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL); |
| if (sec == NULL) |
| goto out_elf_end; |
| } |
| |
| syms = elf_getdata(sec, NULL); |
| if (syms == NULL) |
| goto out_elf_end; |
| |
| sec = elf_getscn(elf, shdr.sh_link); |
| if (sec == NULL) |
| goto out_elf_end; |
| |
| symstrs = elf_getdata(sec, NULL); |
| if (symstrs == NULL) |
| goto out_elf_end; |
| |
| sec_strndx = elf_getscn(elf, ehdr.e_shstrndx); |
| if (sec_strndx == NULL) |
| goto out_elf_end; |
| |
| secstrs = elf_getdata(sec_strndx, NULL); |
| if (secstrs == NULL) |
| goto out_elf_end; |
| |
| nr_syms = shdr.sh_size / shdr.sh_entsize; |
| |
| memset(&sym, 0, sizeof(sym)); |
| if (!kernel) { |
| self->adjust_symbols = (ehdr.e_type == ET_EXEC || |
| elf_section_by_name(elf, &ehdr, &shdr, |
| ".gnu.prelink_undo", |
| NULL) != NULL); |
| } else self->adjust_symbols = 0; |
| |
| elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
| struct symbol *f; |
| const char *elf_name = elf_sym__name(&sym, symstrs); |
| char *demangled = NULL; |
| int is_label = elf_sym__is_label(&sym); |
| const char *section_name; |
| |
| if (kernel && session->ref_reloc_sym.name != NULL && |
| strcmp(elf_name, session->ref_reloc_sym.name) == 0) |
| perf_session__reloc_vmlinux_maps(session, sym.st_value); |
| |
| if (!is_label && !elf_sym__is_a(&sym, map->type)) |
| continue; |
| |
| sec = elf_getscn(elf, sym.st_shndx); |
| if (!sec) |
| goto out_elf_end; |
| |
| gelf_getshdr(sec, &shdr); |
| |
| if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type)) |
| continue; |
| |
| section_name = elf_sec__name(&shdr, secstrs); |
| |
| if (kernel || kmodule) { |
| char dso_name[PATH_MAX]; |
| |
| if (strcmp(section_name, |
| curr_dso->short_name + dso_name_len) == 0) |
| goto new_symbol; |
| |
| if (strcmp(section_name, ".text") == 0) { |
| curr_map = map; |
| curr_dso = self; |
| goto new_symbol; |
| } |
| |
| snprintf(dso_name, sizeof(dso_name), |
| "%s%s", self->short_name, section_name); |
| |
| curr_map = map_groups__find_by_name(&session->kmaps, map->type, dso_name); |
| if (curr_map == NULL) { |
| u64 start = sym.st_value; |
| |
| if (kmodule) |
| start += map->start + shdr.sh_offset; |
| |
| curr_dso = dso__new(dso_name); |
| if (curr_dso == NULL) |
| goto out_elf_end; |
| curr_map = map__new2(start, curr_dso, |
| MAP__FUNCTION); |
| if (curr_map == NULL) { |
| dso__delete(curr_dso); |
| goto out_elf_end; |
| } |
| curr_map->map_ip = identity__map_ip; |
| curr_map->unmap_ip = identity__map_ip; |
| curr_dso->origin = DSO__ORIG_KERNEL; |
| map_groups__insert(&session->kmaps, curr_map); |
| dsos__add(&dsos__kernel, curr_dso); |
| } else |
| curr_dso = curr_map->dso; |
| |
| goto new_symbol; |
| } |
| |
| if (curr_dso->adjust_symbols) { |
| pr_debug2("adjusting symbol: st_value: %Lx sh_addr: " |
| "%Lx sh_offset: %Lx\n", (u64)sym.st_value, |
| (u64)shdr.sh_addr, (u64)shdr.sh_offset); |
| sym.st_value -= shdr.sh_addr - shdr.sh_offset; |
| } |
| /* |
| * We need to figure out if the object was created from C++ sources |
| * DWARF DW_compile_unit has this, but we don't always have access |
| * to it... |
| */ |
| demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI); |
| if (demangled != NULL) |
| elf_name = demangled; |
| new_symbol: |
| f = symbol__new(sym.st_value, sym.st_size, elf_name); |
| free(demangled); |
| if (!f) |
| goto out_elf_end; |
| |
| if (filter && filter(curr_map, f)) |
| symbol__delete(f); |
| else { |
| symbols__insert(&curr_dso->symbols[curr_map->type], f); |
| nr++; |
| } |
| } |
| |
| /* |
| * For misannotated, zeroed, ASM function sizes. |
| */ |
| if (nr > 0) |
| symbols__fixup_end(&self->symbols[map->type]); |
| err = nr; |
| out_elf_end: |
| elf_end(elf); |
| out_close: |
| return err; |
| } |
| |
| static bool dso__build_id_equal(const struct dso *self, u8 *build_id) |
| { |
| return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0; |
| } |
| |
| static bool __dsos__read_build_ids(struct list_head *head) |
| { |
| bool have_build_id = false; |
| struct dso *pos; |
| |
| list_for_each_entry(pos, head, node) |
| if (filename__read_build_id(pos->long_name, pos->build_id, |
| sizeof(pos->build_id)) > 0) { |
| have_build_id = true; |
| pos->has_build_id = true; |
| } |
| |
| return have_build_id; |
| } |
| |
| bool dsos__read_build_ids(void) |
| { |
| bool kbuildids = __dsos__read_build_ids(&dsos__kernel), |
| ubuildids = __dsos__read_build_ids(&dsos__user); |
| return kbuildids || ubuildids; |
| } |
| |
| /* |
| * Align offset to 4 bytes as needed for note name and descriptor data. |
| */ |
| #define NOTE_ALIGN(n) (((n) + 3) & -4U) |
| |
| int filename__read_build_id(const char *filename, void *bf, size_t size) |
| { |
| int fd, err = -1; |
| GElf_Ehdr ehdr; |
| GElf_Shdr shdr; |
| Elf_Data *data; |
| Elf_Scn *sec; |
| Elf_Kind ek; |
| void *ptr; |
| Elf *elf; |
| |
| if (size < BUILD_ID_SIZE) |
| goto out; |
| |
| fd = open(filename, O_RDONLY); |
| if (fd < 0) |
| goto out; |
| |
| elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| if (elf == NULL) { |
| pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); |
| goto out_close; |
| } |
| |
| ek = elf_kind(elf); |
| if (ek != ELF_K_ELF) |
| goto out_elf_end; |
| |
| if (gelf_getehdr(elf, &ehdr) == NULL) { |
| pr_err("%s: cannot get elf header.\n", __func__); |
| goto out_elf_end; |
| } |
| |
| sec = elf_section_by_name(elf, &ehdr, &shdr, |
| ".note.gnu.build-id", NULL); |
| if (sec == NULL) { |
| sec = elf_section_by_name(elf, &ehdr, &shdr, |
| ".notes", NULL); |
| if (sec == NULL) |
| goto out_elf_end; |
| } |
| |
| data = elf_getdata(sec, NULL); |
| if (data == NULL) |
| goto out_elf_end; |
| |
| ptr = data->d_buf; |
| while (ptr < (data->d_buf + data->d_size)) { |
| GElf_Nhdr *nhdr = ptr; |
| int namesz = NOTE_ALIGN(nhdr->n_namesz), |
| descsz = NOTE_ALIGN(nhdr->n_descsz); |
| const char *name; |
| |
| ptr += sizeof(*nhdr); |
| name = ptr; |
| ptr += namesz; |
| if (nhdr->n_type == NT_GNU_BUILD_ID && |
| nhdr->n_namesz == sizeof("GNU")) { |
| if (memcmp(name, "GNU", sizeof("GNU")) == 0) { |
| memcpy(bf, ptr, BUILD_ID_SIZE); |
| err = BUILD_ID_SIZE; |
| break; |
| } |
| } |
| ptr += descsz; |
| } |
| out_elf_end: |
| elf_end(elf); |
| out_close: |
| close(fd); |
| out: |
| return err; |
| } |
| |
| int sysfs__read_build_id(const char *filename, void *build_id, size_t size) |
| { |
| int fd, err = -1; |
| |
| if (size < BUILD_ID_SIZE) |
| goto out; |
| |
| fd = open(filename, O_RDONLY); |
| if (fd < 0) |
| goto out; |
| |
| while (1) { |
| char bf[BUFSIZ]; |
| GElf_Nhdr nhdr; |
| int namesz, descsz; |
| |
| if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) |
| break; |
| |
| namesz = NOTE_ALIGN(nhdr.n_namesz); |
| descsz = NOTE_ALIGN(nhdr.n_descsz); |
| if (nhdr.n_type == NT_GNU_BUILD_ID && |
| nhdr.n_namesz == sizeof("GNU")) { |
| if (read(fd, bf, namesz) != namesz) |
| break; |
| if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { |
| if (read(fd, build_id, |
| BUILD_ID_SIZE) == BUILD_ID_SIZE) { |
| err = 0; |
| break; |
| } |
| } else if (read(fd, bf, descsz) != descsz) |
| break; |
| } else { |
| int n = namesz + descsz; |
| if (read(fd, bf, n) != n) |
| break; |
| } |
| } |
| close(fd); |
| out: |
| return err; |
| } |
| |
| char dso__symtab_origin(const struct dso *self) |
| { |
| static const char origin[] = { |
| [DSO__ORIG_KERNEL] = 'k', |
| [DSO__ORIG_JAVA_JIT] = 'j', |
| [DSO__ORIG_BUILD_ID_CACHE] = 'B', |
| [DSO__ORIG_FEDORA] = 'f', |
| [DSO__ORIG_UBUNTU] = 'u', |
| [DSO__ORIG_BUILDID] = 'b', |
| [DSO__ORIG_DSO] = 'd', |
| [DSO__ORIG_KMODULE] = 'K', |
| }; |
| |
| if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND) |
| return '!'; |
| return origin[self->origin]; |
| } |
| |
| int dso__load(struct dso *self, struct map *map, struct perf_session *session, |
| symbol_filter_t filter) |
| { |
| int size = PATH_MAX; |
| char *name; |
| u8 build_id[BUILD_ID_SIZE]; |
| char build_id_hex[BUILD_ID_SIZE * 2 + 1]; |
| int ret = -1; |
| int fd; |
| |
| dso__set_loaded(self, map->type); |
| |
| if (self->kernel) |
| return dso__load_kernel_sym(self, map, session, filter); |
| |
| name = malloc(size); |
| if (!name) |
| return -1; |
| |
| self->adjust_symbols = 0; |
| |
| if (strncmp(self->name, "/tmp/perf-", 10) == 0) { |
| ret = dso__load_perf_map(self, map, filter); |
| self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT : |
| DSO__ORIG_NOT_FOUND; |
| return ret; |
| } |
| |
| self->origin = DSO__ORIG_BUILD_ID_CACHE; |
| |
| if (self->has_build_id) { |
| build_id__sprintf(self->build_id, sizeof(self->build_id), |
| build_id_hex); |
| snprintf(name, size, "%s/%s/.build-id/%.2s/%s", |
| getenv("HOME"), DEBUG_CACHE_DIR, |
| build_id_hex, build_id_hex + 2); |
| goto open_file; |
| } |
| more: |
| do { |
| self->origin++; |
| switch (self->origin) { |
| case DSO__ORIG_FEDORA: |
| snprintf(name, size, "/usr/lib/debug%s.debug", |
| self->long_name); |
| break; |
| case DSO__ORIG_UBUNTU: |
| snprintf(name, size, "/usr/lib/debug%s", |
| self->long_name); |
| break; |
| case DSO__ORIG_BUILDID: |
| if (filename__read_build_id(self->long_name, build_id, |
| sizeof(build_id))) { |
| build_id__sprintf(build_id, sizeof(build_id), |
| build_id_hex); |
| snprintf(name, size, |
| "/usr/lib/debug/.build-id/%.2s/%s.debug", |
| build_id_hex, build_id_hex + 2); |
| if (self->has_build_id) |
| goto compare_build_id; |
| break; |
| } |
| self->origin++; |
| /* Fall thru */ |
| case DSO__ORIG_DSO: |
| snprintf(name, size, "%s", self->long_name); |
| break; |
| |
| default: |
| goto out; |
| } |
| |
| if (self->has_build_id) { |
| if (filename__read_build_id(name, build_id, |
| sizeof(build_id)) < 0) |
| goto more; |
| compare_build_id: |
| if (!dso__build_id_equal(self, build_id)) |
| goto more; |
| } |
| open_file: |
| fd = open(name, O_RDONLY); |
| } while (fd < 0); |
| |
| ret = dso__load_sym(self, map, NULL, name, fd, filter, 0, 0); |
| close(fd); |
| |
| /* |
| * Some people seem to have debuginfo files _WITHOUT_ debug info!?!? |
| */ |
| if (!ret) |
| goto more; |
| |
| if (ret > 0) { |
| int nr_plt = dso__synthesize_plt_symbols(self, map, filter); |
| if (nr_plt > 0) |
| ret += nr_plt; |
| } |
| out: |
| free(name); |
| if (ret < 0 && strstr(self->name, " (deleted)") != NULL) |
| return 0; |
| return ret; |
| } |
| |
| struct map *map_groups__find_by_name(struct map_groups *self, |
| enum map_type type, const char *name) |
| { |
| struct rb_node *nd; |
| |
| for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) { |
| struct map *map = rb_entry(nd, struct map, rb_node); |
| |
| if (map->dso && strcmp(map->dso->short_name, name) == 0) |
| return map; |
| } |
| |
| return NULL; |
| } |
| |
| static int dso__kernel_module_get_build_id(struct dso *self) |
| { |
| char filename[PATH_MAX]; |
| /* |
| * kernel module short names are of the form "[module]" and |
| * we need just "module" here. |
| */ |
| const char *name = self->short_name + 1; |
| |
| snprintf(filename, sizeof(filename), |
| "/sys/module/%.*s/notes/.note.gnu.build-id", |
| (int)strlen(name - 1), name); |
| |
| if (sysfs__read_build_id(filename, self->build_id, |
| sizeof(self->build_id)) == 0) |
| self->has_build_id = true; |
| |
| return 0; |
| } |
| |
| static int perf_session__set_modules_path_dir(struct perf_session *self, char *dirname) |
| { |
| struct dirent *dent; |
| DIR *dir = opendir(dirname); |
| |
| if (!dir) { |
| pr_debug("%s: cannot open %s dir\n", __func__, dirname); |
| return -1; |
| } |
| |
| while ((dent = readdir(dir)) != NULL) { |
| char path[PATH_MAX]; |
| |
| if (dent->d_type == DT_DIR) { |
| if (!strcmp(dent->d_name, ".") || |
| !strcmp(dent->d_name, "..")) |
| continue; |
| |
| snprintf(path, sizeof(path), "%s/%s", |
| dirname, dent->d_name); |
| if (perf_session__set_modules_path_dir(self, path) < 0) |
| goto failure; |
| } else { |
| char *dot = strrchr(dent->d_name, '.'), |
| dso_name[PATH_MAX]; |
| struct map *map; |
| char *long_name; |
| |
| if (dot == NULL || strcmp(dot, ".ko")) |
| continue; |
| snprintf(dso_name, sizeof(dso_name), "[%.*s]", |
| (int)(dot - dent->d_name), dent->d_name); |
| |
| strxfrchar(dso_name, '-', '_'); |
| map = map_groups__find_by_name(&self->kmaps, MAP__FUNCTION, dso_name); |
| if (map == NULL) |
| continue; |
| |
| snprintf(path, sizeof(path), "%s/%s", |
| dirname, dent->d_name); |
| |
| long_name = strdup(path); |
| if (long_name == NULL) |
| goto failure; |
| dso__set_long_name(map->dso, long_name); |
| dso__kernel_module_get_build_id(map->dso); |
| } |
| } |
| |
| return 0; |
| failure: |
| closedir(dir); |
| return -1; |
| } |
| |
| static int perf_session__set_modules_path(struct perf_session *self) |
| { |
| struct utsname uts; |
| char modules_path[PATH_MAX]; |
| |
| if (uname(&uts) < 0) |
| return -1; |
| |
| snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel", |
| uts.release); |
| |
| return perf_session__set_modules_path_dir(self, modules_path); |
| } |
| |
| /* |
| * Constructor variant for modules (where we know from /proc/modules where |
| * they are loaded) and for vmlinux, where only after we load all the |
| * symbols we'll know where it starts and ends. |
| */ |
| static struct map *map__new2(u64 start, struct dso *dso, enum map_type type) |
| { |
| struct map *self = malloc(sizeof(*self)); |
| |
| if (self != NULL) { |
| /* |
| * ->end will be filled after we load all the symbols |
| */ |
| map__init(self, type, start, 0, 0, dso); |
| } |
| |
| return self; |
| } |
| |
| struct map *perf_session__new_module_map(struct perf_session *self, u64 start, |
| const char *filename) |
| { |
| struct map *map; |
| struct dso *dso = __dsos__findnew(&dsos__kernel, filename); |
| |
| if (dso == NULL) |
| return NULL; |
| |
| map = map__new2(start, dso, MAP__FUNCTION); |
| if (map == NULL) |
| return NULL; |
| |
| dso->origin = DSO__ORIG_KMODULE; |
| map_groups__insert(&self->kmaps, map); |
| return map; |
| } |
| |
| static int perf_session__create_module_maps(struct perf_session *self) |
| { |
| char *line = NULL; |
| size_t n; |
| FILE *file = fopen("/proc/modules", "r"); |
| struct map *map; |
| |
| if (file == NULL) |
| return -1; |
| |
| while (!feof(file)) { |
| char name[PATH_MAX]; |
| u64 start; |
| char *sep; |
| int line_len; |
| |
| line_len = getline(&line, &n, file); |
| if (line_len < 0) |
| break; |
| |
| if (!line) |
| goto out_failure; |
| |
| line[--line_len] = '\0'; /* \n */ |
| |
| sep = strrchr(line, 'x'); |
| if (sep == NULL) |
| continue; |
| |
| hex2u64(sep + 1, &start); |
| |
| sep = strchr(line, ' '); |
| if (sep == NULL) |
| continue; |
| |
| *sep = '\0'; |
| |
| snprintf(name, sizeof(name), "[%s]", line); |
| map = perf_session__new_module_map(self, start, name); |
| if (map == NULL) |
| goto out_delete_line; |
| dso__kernel_module_get_build_id(map->dso); |
| } |
| |
| free(line); |
| fclose(file); |
| |
| return perf_session__set_modules_path(self); |
| |
| out_delete_line: |
| free(line); |
| out_failure: |
| return -1; |
| } |
| |
| static int dso__load_vmlinux(struct dso *self, struct map *map, |
| struct perf_session *session, |
| const char *vmlinux, symbol_filter_t filter) |
| { |
| int err = -1, fd; |
| |
| if (self->has_build_id) { |
| u8 build_id[BUILD_ID_SIZE]; |
| |
| if (filename__read_build_id(vmlinux, build_id, |
| sizeof(build_id)) < 0) { |
| pr_debug("No build_id in %s, ignoring it\n", vmlinux); |
| return -1; |
| } |
| if (!dso__build_id_equal(self, build_id)) { |
| char expected_build_id[BUILD_ID_SIZE * 2 + 1], |
| vmlinux_build_id[BUILD_ID_SIZE * 2 + 1]; |
| |
| build_id__sprintf(self->build_id, |
| sizeof(self->build_id), |
| expected_build_id); |
| build_id__sprintf(build_id, sizeof(build_id), |
| vmlinux_build_id); |
| pr_debug("build_id in %s is %s while expected is %s, " |
| "ignoring it\n", vmlinux, vmlinux_build_id, |
| expected_build_id); |
| return -1; |
| } |
| } |
| |
| fd = open(vmlinux, O_RDONLY); |
| if (fd < 0) |
| return -1; |
| |
| dso__set_loaded(self, map->type); |
| err = dso__load_sym(self, map, session, vmlinux, fd, filter, 1, 0); |
| close(fd); |
| |
| return err; |
| } |
| |
| static int dso__load_kernel_sym(struct dso *self, struct map *map, |
| struct perf_session *session, symbol_filter_t filter) |
| { |
| int err; |
| const char *kallsyms_filename = NULL; |
| char *kallsyms_allocated_filename = NULL; |
| /* |
| * Step 1: if the user specified a vmlinux filename, use it and only |
| * it, reporting errors to the user if it cannot be used. |
| * |
| * For instance, try to analyse an ARM perf.data file _without_ a |
| * build-id, or if the user specifies the wrong path to the right |
| * vmlinux file, obviously we can't fallback to another vmlinux (a |
| * x86_86 one, on the machine where analysis is being performed, say), |
| * or worse, /proc/kallsyms. |
| * |
| * If the specified file _has_ a build-id and there is a build-id |
| * section in the perf.data file, we will still do the expected |
| * validation in dso__load_vmlinux and will bail out if they don't |
| * match. |
| */ |
| if (symbol_conf.vmlinux_name != NULL) { |
| err = dso__load_vmlinux(self, map, session, |
| symbol_conf.vmlinux_name, filter); |
| goto out_try_fixup; |
| } |
| |
| if (vmlinux_path != NULL) { |
| int i; |
| pr_debug("Looking at the vmlinux_path (%d entries long)\n", |
| vmlinux_path__nr_entries); |
| for (i = 0; i < vmlinux_path__nr_entries; ++i) { |
| err = dso__load_vmlinux(self, map, session, |
| vmlinux_path[i], filter); |
| if (err > 0) { |
| pr_debug("Using %s for symbols\n", |
| vmlinux_path[i]); |
| dso__set_long_name(self, |
| strdup(vmlinux_path[i])); |
| goto out_fixup; |
| } |
| } |
| } |
| |
| /* |
| * Say the kernel DSO was created when processing the build-id header table, |
| * we have a build-id, so check if it is the same as the running kernel, |
| * using it if it is. |
| */ |
| if (self->has_build_id) { |
| u8 kallsyms_build_id[BUILD_ID_SIZE]; |
| char sbuild_id[BUILD_ID_SIZE * 2 + 1]; |
| |
| if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id, |
| sizeof(kallsyms_build_id)) == 0) { |
| if (dso__build_id_equal(self, kallsyms_build_id)) { |
| kallsyms_filename = "/proc/kallsyms"; |
| goto do_kallsyms; |
| } |
| } |
| /* |
| * Now look if we have it on the build-id cache in |
| * $HOME/.debug/[kernel.kallsyms]. |
| */ |
| build_id__sprintf(self->build_id, sizeof(self->build_id), |
| sbuild_id); |
| |
| if (asprintf(&kallsyms_allocated_filename, |
| "%s/.debug/[kernel.kallsyms]/%s", |
| getenv("HOME"), sbuild_id) == -1) |
| return -1; |
| |
| kallsyms_filename = kallsyms_allocated_filename; |
| |
| if (access(kallsyms_filename, F_OK)) { |
| free(kallsyms_allocated_filename); |
| return -1; |
| } |
| } else { |
| /* |
| * Last resort, if we don't have a build-id and couldn't find |
| * any vmlinux file, try the running kernel kallsyms table. |
| */ |
| kallsyms_filename = "/proc/kallsyms"; |
| } |
| |
| do_kallsyms: |
| err = dso__load_kallsyms(self, kallsyms_filename, map, session, filter); |
| free(kallsyms_allocated_filename); |
| |
| out_try_fixup: |
| if (err > 0) { |
| out_fixup: |
| if (kallsyms_filename != NULL) |
| dso__set_long_name(self, strdup("[kernel.kallsyms]")); |
| map__fixup_start(map); |
| map__fixup_end(map); |
| } |
| |
| return err; |
| } |
| |
| LIST_HEAD(dsos__user); |
| LIST_HEAD(dsos__kernel); |
| struct dso *vdso; |
| |
| static void dsos__add(struct list_head *head, struct dso *dso) |
| { |
| list_add_tail(&dso->node, head); |
| } |
| |
| static struct dso *dsos__find(struct list_head *head, const char *name) |
| { |
| struct dso *pos; |
| |
| list_for_each_entry(pos, head, node) |
| if (strcmp(pos->long_name, name) == 0) |
| return pos; |
| return NULL; |
| } |
| |
| struct dso *__dsos__findnew(struct list_head *head, const char *name) |
| { |
| struct dso *dso = dsos__find(head, name); |
| |
| if (!dso) { |
| dso = dso__new(name); |
| if (dso != NULL) { |
| dsos__add(head, dso); |
| dso__set_basename(dso); |
| } |
| } |
| |
| return dso; |
| } |
| |
| static void __dsos__fprintf(struct list_head *head, FILE *fp) |
| { |
| struct dso *pos; |
| |
| list_for_each_entry(pos, head, node) { |
| int i; |
| for (i = 0; i < MAP__NR_TYPES; ++i) |
| dso__fprintf(pos, i, fp); |
| } |
| } |
| |
| void dsos__fprintf(FILE *fp) |
| { |
| __dsos__fprintf(&dsos__kernel, fp); |
| __dsos__fprintf(&dsos__user, fp); |
| } |
| |
| static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp, |
| bool with_hits) |
| { |
| struct dso *pos; |
| size_t ret = 0; |
| |
| list_for_each_entry(pos, head, node) { |
| if (with_hits && !pos->hit) |
| continue; |
| ret += dso__fprintf_buildid(pos, fp); |
| ret += fprintf(fp, " %s\n", pos->long_name); |
| } |
| return ret; |
| } |
| |
| size_t dsos__fprintf_buildid(FILE *fp, bool with_hits) |
| { |
| return (__dsos__fprintf_buildid(&dsos__kernel, fp, with_hits) + |
| __dsos__fprintf_buildid(&dsos__user, fp, with_hits)); |
| } |
| |
| static struct dso *dsos__create_kernel(const char *vmlinux) |
| { |
| struct dso *kernel = dso__new(vmlinux ?: "[kernel.kallsyms]"); |
| |
| if (kernel == NULL) |
| return NULL; |
| |
| kernel->short_name = "[kernel]"; |
| kernel->kernel = 1; |
| |
| vdso = dso__new("[vdso]"); |
| if (vdso == NULL) |
| goto out_delete_kernel_dso; |
| dso__set_loaded(vdso, MAP__FUNCTION); |
| |
| if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id, |
| sizeof(kernel->build_id)) == 0) |
| kernel->has_build_id = true; |
| |
| dsos__add(&dsos__kernel, kernel); |
| dsos__add(&dsos__user, vdso); |
| |
| return kernel; |
| |
| out_delete_kernel_dso: |
| dso__delete(kernel); |
| return NULL; |
| } |
| |
| int __map_groups__create_kernel_maps(struct map_groups *self, |
| struct map *vmlinux_maps[MAP__NR_TYPES], |
| struct dso *kernel) |
| { |
| enum map_type type; |
| |
| for (type = 0; type < MAP__NR_TYPES; ++type) { |
| vmlinux_maps[type] = map__new2(0, kernel, type); |
| if (vmlinux_maps[type] == NULL) |
| return -1; |
| |
| vmlinux_maps[type]->map_ip = |
| vmlinux_maps[type]->unmap_ip = identity__map_ip; |
| map_groups__insert(self, vmlinux_maps[type]); |
| } |
| |
| return 0; |
| } |
| |
| static int map_groups__create_kernel_maps(struct map_groups *self, |
| struct map *vmlinux_maps[MAP__NR_TYPES], |
| const char *vmlinux) |
| { |
| struct dso *kernel = dsos__create_kernel(vmlinux); |
| |
| if (kernel == NULL) |
| return -1; |
| |
| return __map_groups__create_kernel_maps(self, vmlinux_maps, kernel); |
| } |
| |
| static void vmlinux_path__exit(void) |
| { |
| while (--vmlinux_path__nr_entries >= 0) { |
| free(vmlinux_path[vmlinux_path__nr_entries]); |
| vmlinux_path[vmlinux_path__nr_entries] = NULL; |
| } |
| |
| free(vmlinux_path); |
| vmlinux_path = NULL; |
| } |
| |
| static int vmlinux_path__init(void) |
| { |
| struct utsname uts; |
| char bf[PATH_MAX]; |
| |
| if (uname(&uts) < 0) |
| return -1; |
| |
| vmlinux_path = malloc(sizeof(char *) * 5); |
| if (vmlinux_path == NULL) |
| return -1; |
| |
| vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux"); |
| if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
| goto out_fail; |
| ++vmlinux_path__nr_entries; |
| vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux"); |
| if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
| goto out_fail; |
| ++vmlinux_path__nr_entries; |
| snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release); |
| vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); |
| if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
| goto out_fail; |
| ++vmlinux_path__nr_entries; |
| snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release); |
| vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); |
| if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
| goto out_fail; |
| ++vmlinux_path__nr_entries; |
| snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux", |
| uts.release); |
| vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); |
| if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
| goto out_fail; |
| ++vmlinux_path__nr_entries; |
| |
| return 0; |
| |
| out_fail: |
| vmlinux_path__exit(); |
| return -1; |
| } |
| |
| static int setup_list(struct strlist **list, const char *list_str, |
| const char *list_name) |
| { |
| if (list_str == NULL) |
| return 0; |
| |
| *list = strlist__new(true, list_str); |
| if (!*list) { |
| pr_err("problems parsing %s list\n", list_name); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int symbol__init(void) |
| { |
| elf_version(EV_CURRENT); |
| if (symbol_conf.sort_by_name) |
| symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) - |
| sizeof(struct symbol)); |
| |
| if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0) |
| return -1; |
| |
| if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { |
| pr_err("'.' is the only non valid --field-separator argument\n"); |
| return -1; |
| } |
| |
| if (setup_list(&symbol_conf.dso_list, |
| symbol_conf.dso_list_str, "dso") < 0) |
| return -1; |
| |
| if (setup_list(&symbol_conf.comm_list, |
| symbol_conf.comm_list_str, "comm") < 0) |
| goto out_free_dso_list; |
| |
| if (setup_list(&symbol_conf.sym_list, |
| symbol_conf.sym_list_str, "symbol") < 0) |
| goto out_free_comm_list; |
| |
| return 0; |
| |
| out_free_dso_list: |
| strlist__delete(symbol_conf.dso_list); |
| out_free_comm_list: |
| strlist__delete(symbol_conf.comm_list); |
| return -1; |
| } |
| |
| int perf_session__create_kernel_maps(struct perf_session *self) |
| { |
| if (map_groups__create_kernel_maps(&self->kmaps, self->vmlinux_maps, |
| symbol_conf.vmlinux_name) < 0) |
| return -1; |
| |
| if (symbol_conf.use_modules && |
| perf_session__create_module_maps(self) < 0) |
| pr_debug("Failed to load list of modules for session %s, " |
| "continuing...\n", self->filename); |
| /* |
| * Now that we have all the maps created, just set the ->end of them: |
| */ |
| map_groups__fixup_end(&self->kmaps); |
| return 0; |
| } |