diff options
Diffstat (limited to 'tools/perf/util/symbol.c')
-rw-r--r-- | tools/perf/util/symbol.c | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 946ec319568b..7b4cedeb3020 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c | |||
@@ -9,6 +9,7 @@ | |||
9 | #include <libelf.h> | 9 | #include <libelf.h> |
10 | #include <gelf.h> | 10 | #include <gelf.h> |
11 | #include <elf.h> | 11 | #include <elf.h> |
12 | #include <limits.h> | ||
12 | #include <sys/utsname.h> | 13 | #include <sys/utsname.h> |
13 | 14 | ||
14 | enum dso_origin { | 15 | enum dso_origin { |
@@ -943,6 +944,50 @@ out: | |||
943 | return err; | 944 | return err; |
944 | } | 945 | } |
945 | 946 | ||
947 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) | ||
948 | { | ||
949 | int fd, err = -1; | ||
950 | |||
951 | if (size < BUILD_ID_SIZE) | ||
952 | goto out; | ||
953 | |||
954 | fd = open(filename, O_RDONLY); | ||
955 | if (fd < 0) | ||
956 | goto out; | ||
957 | |||
958 | while (1) { | ||
959 | char bf[BUFSIZ]; | ||
960 | GElf_Nhdr nhdr; | ||
961 | int namesz, descsz; | ||
962 | |||
963 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) | ||
964 | break; | ||
965 | |||
966 | namesz = (nhdr.n_namesz + 3) & -4U; | ||
967 | descsz = (nhdr.n_descsz + 3) & -4U; | ||
968 | if (nhdr.n_type == NT_GNU_BUILD_ID && | ||
969 | nhdr.n_namesz == sizeof("GNU")) { | ||
970 | if (read(fd, bf, namesz) != namesz) | ||
971 | break; | ||
972 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { | ||
973 | if (read(fd, build_id, | ||
974 | BUILD_ID_SIZE) == BUILD_ID_SIZE) { | ||
975 | err = 0; | ||
976 | break; | ||
977 | } | ||
978 | } else if (read(fd, bf, descsz) != descsz) | ||
979 | break; | ||
980 | } else { | ||
981 | int n = namesz + descsz; | ||
982 | if (read(fd, bf, n) != n) | ||
983 | break; | ||
984 | } | ||
985 | } | ||
986 | close(fd); | ||
987 | out: | ||
988 | return err; | ||
989 | } | ||
990 | |||
946 | char dso__symtab_origin(const struct dso *self) | 991 | char dso__symtab_origin(const struct dso *self) |
947 | { | 992 | { |
948 | static const char origin[] = { | 993 | static const char origin[] = { |
@@ -1218,7 +1263,7 @@ static struct map *map__new2(u64 start, struct dso *dso) | |||
1218 | return self; | 1263 | return self; |
1219 | } | 1264 | } |
1220 | 1265 | ||
1221 | static int dsos__load_modules(void) | 1266 | int dsos__load_modules(void) |
1222 | { | 1267 | { |
1223 | char *line = NULL; | 1268 | char *line = NULL; |
1224 | size_t n; | 1269 | size_t n; |
@@ -1268,6 +1313,12 @@ static int dsos__load_modules(void) | |||
1268 | goto out_delete_line; | 1313 | goto out_delete_line; |
1269 | } | 1314 | } |
1270 | 1315 | ||
1316 | snprintf(name, sizeof(name), | ||
1317 | "/sys/module/%s/notes/.note.gnu.build-id", line); | ||
1318 | if (sysfs__read_build_id(name, dso->build_id, | ||
1319 | sizeof(dso->build_id)) == 0) | ||
1320 | dso->has_build_id = true; | ||
1321 | |||
1271 | dso->origin = DSO__ORIG_KMODULE; | 1322 | dso->origin = DSO__ORIG_KMODULE; |
1272 | kernel_maps__insert(map); | 1323 | kernel_maps__insert(map); |
1273 | dsos__add(dso); | 1324 | dsos__add(dso); |