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@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1352482044-3443-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 3eff17f703f3..5dab3ca96980 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;