[tip:perf/core] perf tools: Fix cross-endian analysis

tip-bot for David Ahern
2015-04-11T06:38:07Z

Commit-ID: 1060ab857f64f33a9445881fd31fa91470aeb622
Gitweb: http://git.kernel.org/tip/1060ab857f64f33a9445881fd31fa91470aeb622
Author: David Ahern <david.ahern@oracle.com>
AuthorDate: Thu, 9 Apr 2015 16:15:46 -0400
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 10 Apr 2015 10:13:58 -0300

perf tools: Fix cross-endian analysis

Trying to analyze a big endian data file on little endian system fails
with the error:

0xa9b40 [0x70]: failed to process type: 9

The problem is that header parsing is not done correctly because the
file attributes are not swapped. Make it so. With this patch able to
analyze a sparc64 data file on x86_64.

Signed-off-by: David Ahern <david.ahern@oracle.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1428610546-178789-1-git-send-email-david.ahern@oracle.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/header.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index fff3b2a..918fd8a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2504,8 +2504,11 @@ int perf_session__read_header(struct perf_session *session)
if (read_attr(fd, header, &f_attr) < 0)
goto out_errno;

- if (header->needs_swap)
+ if (header->needs_swap) {
+ f_attr.ids.size = bswap_64(f_attr.ids.size);
+ f_attr.ids.offset = bswap_64(f_attr.ids.offset);
perf_event__attr_swap(&f_attr.attr);
+ }

tmp = lseek(fd, 0, SEEK_CUR);
evsel = perf_evsel__new(&f_attr.attr);