linux-kernel - [PATCH v2 4/4] perf tests: print objdump/dso buffers if they don't match

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Message-Id: <d0f42f786bc0e965918e0f422df25617a12a4021.1441181335.git.jstancek@redhat.com>
Date:	Wed,  2 Sep 2015 10:19:17 +0200
From:	Jan Stancek <jstancek@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
	dsahern@...il.com, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	mingo@...nel.org, namhyung@...nel.org, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, jstancek@...hat.com
Subject: [PATCH v2 4/4] perf tests: print objdump/dso buffers if they don't match

Signed-off-by: Jan Stancek <jstancek@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 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 e6bf47ff7e91..53a04f899d18 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -163,6 +163,18 @@ 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)
 {
@@ -265,6 +277,10 @@ 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");
-- 
1.8.3.1

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