linux-kernel - [tip:perf/core] perf annotate: Don' t try to follow jump target on PLT symbols

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Message-ID: <tip-32ae1efd9d40645601cd4e09fa83a2711dd1ad6d@git.kernel.org>
Date:	Tue, 13 Nov 2012 23:43:09 -0800
From:	tip-bot for Namhyung Kim <namhyung.kim@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, eranian@...gle.com,
	hpa@...or.com, mingo@...nel.org, peterz@...radead.org,
	namhyung.kim@....com, namhyung@...nel.org, jolsa@...hat.com,
	ak@...ux.intel.com, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] perf annotate: Don'
 t try to follow jump target on PLT symbols

Commit-ID:  32ae1efd9d40645601cd4e09fa83a2711dd1ad6d
Gitweb:     http://git.kernel.org/tip/32ae1efd9d40645601cd4e09fa83a2711dd1ad6d
Author:     Namhyung Kim <namhyung.kim@....com>
AuthorDate: Sat, 10 Nov 2012 02:27:15 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 9 Nov 2012 16:23:21 -0300

perf annotate: Don't try to follow jump target on PLT symbols

The perf annotate browser on TUI can identify a jump target for a
selected instruction.  It assumes that the jump target is within the
function but it's not the case of PLT symbols which have offset out of
the function as a target.

Since it caused a segmentation fault, do not try to follow jump target
on the PLT symbols.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1352482044-3443-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/ui/browsers/annotate.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 3eff17f..5dab3ca 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -188,6 +188,12 @@ static void annotate_browser__draw_current_jump(struct ui_browser *browser)
 	struct disasm_line *cursor = ab->selection, *target;
 	struct browser_disasm_line *btarget, *bcursor;
 	unsigned int from, to;
+	struct map_symbol *ms = ab->b.priv;
+	struct symbol *sym = ms->sym;
+
+	/* PLT symbols contain external offsets */
+	if (strstr(sym->name, "@plt"))
+		return;
 
 	if (!cursor || !cursor->ins || !ins__is_jump(cursor->ins) ||
 	    !disasm_line__has_offset(cursor))
@@ -771,6 +777,12 @@ static void annotate_browser__mark_jump_targets(struct annotate_browser *browser
 						size_t size)
 {
 	u64 offset;
+	struct map_symbol *ms = browser->b.priv;
+	struct symbol *sym = ms->sym;
+
+	/* PLT symbols contain external offsets */
+	if (strstr(sym->name, "@plt"))
+		return;
 
 	for (offset = 0; offset < size; ++offset) {
 		struct disasm_line *dl = browser->offsets[offset], *dlt;
--
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