diff options
Diffstat (limited to 'tools/perf/util/header.c')
| -rw-r--r-- | tools/perf/util/header.c | 63 |
1 files changed, 51 insertions, 12 deletions
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index ec96321..b31e0ae 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -1,8 +1,10 @@ #include <sys/types.h> +#include <byteswap.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <linux/list.h> +#include <linux/kernel.h> #include "util.h" #include "header.h" @@ -464,8 +466,21 @@ static int do_read(int fd, void *buf, size_t size) return 0; } +static int perf_header__getbuffer64(struct perf_header *self, + int fd, void *buf, size_t size) +{ + if (do_read(fd, buf, size)) + return -1; + + if (self->needs_swap) + mem_bswap_64(buf, size); + + return 0; +} + int perf_header__process_sections(struct perf_header *self, int fd, int (*process)(struct perf_file_section *self, + struct perf_header *ph, int feat, int fd)) { struct perf_file_section *feat_sec; @@ -486,7 +501,7 @@ int perf_header__process_sections(struct perf_header *self, int fd, lseek(fd, self->data_offset + self->data_size, SEEK_SET); - if (do_read(fd, feat_sec, sec_size)) + if (perf_header__getbuffer64(self, fd, feat_sec, sec_size)) goto out_free; err = 0; @@ -494,7 +509,7 @@ int perf_header__process_sections(struct perf_header *self, int fd, if (perf_header__has_feat(self, feat)) { struct perf_file_section *sec = &feat_sec[idx++]; - err = process(sec, feat, fd); + err = process(sec, self, feat, fd); if (err < 0) break; } @@ -511,10 +526,20 @@ int perf_file_header__read(struct perf_file_header *self, lseek(fd, 0, SEEK_SET); if (do_read(fd, self, sizeof(*self)) || - self->magic != PERF_MAGIC || - self->attr_size != sizeof(struct perf_file_attr)) + memcmp(&self->magic, __perf_magic, sizeof(self->magic))) return -1; + if (self->attr_size != sizeof(struct perf_file_attr)) { + u64 attr_size = bswap_64(self->attr_size); + + if (attr_size != sizeof(struct perf_file_attr)) + return -1; + + mem_bswap_64(self, offsetof(struct perf_file_header, + adds_features)); + ph->needs_swap = true; + } + if (self->size != sizeof(*self)) { /* Support the previous format */ if (self->size == offsetof(typeof(*self), adds_features)) @@ -524,16 +549,28 @@ int perf_file_header__read(struct perf_file_header *self, } memcpy(&ph->adds_features, &self->adds_features, - sizeof(self->adds_features)); + sizeof(ph->adds_features)); + /* + * FIXME: hack that assumes that if we need swap the perf.data file + * may be coming from an arch with a different word-size, ergo different + * DEFINE_BITMAP format, investigate more later, but for now its mostly + * safe to assume that we have a build-id section. Trace files probably + * have several other issues in this realm anyway... + */ + if (ph->needs_swap) { + memset(&ph->adds_features, 0, sizeof(ph->adds_features)); + perf_header__set_feat(ph, HEADER_BUILD_ID); + } ph->event_offset = self->event_types.offset; - ph->event_size = self->event_types.size; - ph->data_offset = self->data.offset; + ph->event_size = self->event_types.size; + ph->data_offset = self->data.offset; ph->data_size = self->data.size; return 0; } static int perf_file_section__process(struct perf_file_section *self, + struct perf_header *ph, int feat, int fd) { if (lseek(fd, self->offset, SEEK_SET) < 0) { @@ -548,7 +585,7 @@ static int perf_file_section__process(struct perf_file_section *self, break; case HEADER_BUILD_ID: - if (perf_header__read_build_ids(fd, self->offset, self->size)) + if (perf_header__read_build_ids(ph, fd, self->offset, self->size)) pr_debug("Failed to read buildids, continuing...\n"); break; default: @@ -560,7 +597,7 @@ static int perf_file_section__process(struct perf_file_section *self, int perf_header__read(struct perf_header *self, int fd) { - struct perf_file_header f_header; + struct perf_file_header f_header; struct perf_file_attr f_attr; u64 f_id; int nr_attrs, nr_ids, i, j; @@ -577,8 +614,9 @@ int perf_header__read(struct perf_header *self, int fd) struct perf_header_attr *attr; off_t tmp; - if (do_read(fd, &f_attr, sizeof(f_attr))) + if (perf_header__getbuffer64(self, fd, &f_attr, sizeof(f_attr))) goto out_errno; + tmp = lseek(fd, 0, SEEK_CUR); attr = perf_header_attr__new(&f_attr.attr); @@ -589,7 +627,7 @@ int perf_header__read(struct perf_header *self, int fd) lseek(fd, f_attr.ids.offset, SEEK_SET); for (j = 0; j < nr_ids; j++) { - if (do_read(fd, &f_id, sizeof(f_id))) + if (perf_header__getbuffer64(self, fd, &f_id, sizeof(f_id))) goto out_errno; if (perf_header_attr__add_id(attr, f_id) < 0) { @@ -610,7 +648,8 @@ int perf_header__read(struct perf_header *self, int fd) events = malloc(f_header.event_types.size); if (events == NULL) return -ENOMEM; - if (do_read(fd, events, f_header.event_types.size)) + if (perf_header__getbuffer64(self, fd, events, + f_header.event_types.size)) goto out_errno; event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type); } |