diff options
| -rw-r--r-- | tools/perf/util/symbol.c | 80 |
1 files changed, 47 insertions, 33 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 242d2b216f4..b812ace91c6 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -26,6 +26,8 @@ #define NT_GNU_BUILD_ID 3 #endif +static bool dso__build_id_equal(const struct dso *self, u8 *build_id); +static int elf_read_build_id(Elf *elf, void *bf, size_t size); 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, @@ -993,6 +995,17 @@ static int dso__load_sym(struct dso *self, struct map *map, const char *name, goto out_elf_end; } + if (self->has_build_id) { + u8 build_id[BUILD_ID_SIZE]; + + if (elf_read_build_id(elf, build_id, + BUILD_ID_SIZE) != BUILD_ID_SIZE) + goto out_elf_end; + + if (!dso__build_id_equal(self, build_id)) + 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); @@ -1193,37 +1206,26 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits) */ #define NOTE_ALIGN(n) (((n) + 3) & -4U) -int filename__read_build_id(const char *filename, void *bf, size_t size) +static int elf_read_build_id(Elf *elf, void *bf, size_t size) { - int fd, err = -1; + int 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; + goto out; if (gelf_getehdr(elf, &ehdr) == NULL) { pr_err("%s: cannot get elf header.\n", __func__); - goto out_elf_end; + goto out; } sec = elf_section_by_name(elf, &ehdr, &shdr, @@ -1232,12 +1234,12 @@ int filename__read_build_id(const char *filename, void *bf, size_t size) sec = elf_section_by_name(elf, &ehdr, &shdr, ".notes", NULL); if (sec == NULL) - goto out_elf_end; + goto out; } data = elf_getdata(sec, NULL); if (data == NULL) - goto out_elf_end; + goto out; ptr = data->d_buf; while (ptr < (data->d_buf + data->d_size)) { @@ -1259,7 +1261,31 @@ int filename__read_build_id(const char *filename, void *bf, size_t size) } ptr += descsz; } -out_elf_end: + +out: + return err; +} + +int filename__read_build_id(const char *filename, void *bf, size_t size) +{ + int fd, err = -1; + 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; + } + + err = elf_read_build_id(elf, bf, size); + elf_end(elf); out_close: close(fd); @@ -1335,7 +1361,6 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter) { int size = PATH_MAX; char *name; - u8 build_id[BUILD_ID_SIZE]; int ret = -1; int fd; struct machine *machine; @@ -1382,16 +1407,14 @@ more: self->long_name); break; case DSO__ORIG_BUILDID: - if (filename__read_build_id(self->long_name, build_id, - sizeof(build_id))) { + if (self->has_build_id) { char build_id_hex[BUILD_ID_SIZE * 2 + 1]; - build_id__sprintf(build_id, sizeof(build_id), + build_id__sprintf(self->build_id, + sizeof(self->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++; @@ -1410,15 +1433,6 @@ more: 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); |