[tip:perf/core] perf tests: Print objdump/dso buffers if they don 't match

[tip-bot for Jan Stancek <tipbot@zytor.com>]

Commit-ID:  fd405cf6cfddd300377bd5fd9b93d2ff66fbc32d
Gitweb:     http://git.kernel.org/tip/fd405cf6cfddd300377bd5fd9b93d2ff66fbc32d
Author:     Jan Stancek <jstancek@redhat.com>
AuthorDate: Wed, 2 Sep 2015 10:19:17 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 14 Sep 2015 12:50:13 -0300

perf tests: Print objdump/dso buffers if they don't match

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/d0f42f786bc0e965918e0f422df25617a12a4021.1441181335.git.jstancek@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/tests/code-reading.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 8145c67..2d21183 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -162,6 +162,18 @@ static int read_via_objdump(const char *filename, u64 addr, void *buf,
 	return ret;
 }
 
+static void dump_buf(unsigned char *buf, size_t len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++) {
+		pr_debug("0x%02x ", buf[i]);
+		if (i % 16 == 15)
+			pr_debug("\n");
+	}
+	pr_debug("\n");
+}
+
 static int read_object_code(u64 addr, size_t len, u8 cpumode,
 			    struct thread *thread, struct state *state)
 {
@@ -264,6 +276,10 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 	/* The results should be identical */
 	if (memcmp(buf1, buf2, len)) {
 		pr_debug("Bytes read differ from those read by objdump\n");
+		pr_debug("buf1 (dso):\n");
+		dump_buf(buf1, len);
+		pr_debug("buf2 (objdump):\n");
+		dump_buf(buf2, len);
 		return -1;
 	}
 	pr_debug("Bytes read match those read by objdump\n");