linux-kernel - [tip:perf/core] perf tests: Stop reading if objdump output crossed sections

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Date:	Mon, 14 Sep 2015 23:58:23 -0700
From:	tip-bot for Jan Stancek <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
	paulus@...ba.org, hpa@...or.com, fweisbec@...il.com,
	tglx@...utronix.de, cjashfor@...ux.vnet.ibm.com,
	a.p.zijlstra@...llo.nl, acme@...hat.com, dsahern@...il.com,
	mingo@...nel.org, jolsa@...nel.org, jstancek@...hat.com,
	namhyung@...nel.org
Subject: [tip:perf/core] perf tests:
  Stop reading if objdump output crossed sections

Commit-ID:  edfdb7eab0fe5f98f2951598dc679b71bdb3e16b
Gitweb:     http://git.kernel.org/tip/edfdb7eab0fe5f98f2951598dc679b71bdb3e16b
Author:     Jan Stancek <jstancek@...hat.com>
AuthorDate: Wed, 2 Sep 2015 10:19:16 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 14 Sep 2015 12:50:12 -0300

perf tests: Stop reading if objdump output crossed sections

objdump output can span across multiple sections:

  Disassembly of section .text:
    0000000000000008 <crc32c+0x8>:
       8:       48 89 e5                mov    %rsp,%rbp
       b:       53                      push   %rbx
       c:       8b 01                   mov    (%rcx),%eax
    <snip>
      6b:       90                      nop

  Disassembly of section .init.text:
    0000000000000008 <init_module+0x8>:
       8:       00 00                   add    %al,(%rax)
       a:       00 00                   add    %al,(%rax)
       c:       48 89 e5

Stop further reading if an address starts going backwards, assuming we
crossed sections.

Signed-off-by: Jan Stancek <jstancek@...hat.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/9d1ea95e5f9884fdff1be6f761a2feabef37412c.1441181335.git.jstancek@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/tests/code-reading.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index c409409..8145c67 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -79,7 +79,7 @@ static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr)
 	size_t line_len, off_last = 0;
 	ssize_t ret;
 	int err = 0;
-	u64 addr;
+	u64 addr, last_addr = start_addr;
 
 	while (off_last < *len) {
 		size_t off, read_bytes, written_bytes;
@@ -101,6 +101,11 @@ static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr)
 
 		if (sscanf(line, "%"PRIx64, &addr) != 1)
 			continue;
+		if (addr < last_addr) {
+			pr_debug("addr going backwards, read beyond section?\n");
+			break;
+		}
+		last_addr = addr;
 
 		/* copy it from temporary buffer to 'buf' according
 		 * to address on current objdump line */
--
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