linux-kernel - [PATCH 3/3] perf annotate: Don't try to follow jump target on PLT symbols

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Message-Id: <1352423412-4895-3-git-send-email-namhyung@kernel.org>
Date:	Fri,  9 Nov 2012 10:10:12 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: [PATCH 3/3] perf annotate: Don't try to follow jump target on PLT symbols

From: Namhyung Kim <namhyung.kim@....com>

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>
---
 tools/perf/ui/browsers/annotate.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index aec11f34d394..bb393dd26ba2 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -190,6 +190,12 @@ 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))
@@ -773,6 +779,12 @@ 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;
-- 
1.7.11.7

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