Commit-ID: 32ae1efd9d40645601cd4e09fa83a2711dd1ad6d
Gitweb: http://git.kernel.org/tip/32ae1efd9d40645601cd4e09fa83a2711dd1ad6d
Author: Namhyung Kim <namhyung.kim@xxxxxxx>
AuthorDate: Sat, 10 Nov 2012 02:27:15 +0900
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1352482044-3443-5-git-send-email-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
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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