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perf libdw: Check for mmaps also in MAP__VARIABLE tree
author
Jiri Olsa
<jolsa@kernel.org>
Thu, 7 Jan 2016 09:14:02 +0000
(10:14 +0100)
committer
Arnaldo Carvalho de Melo
<acme@redhat.com>
Fri, 8 Jan 2016 17:16:57 +0000
(14:16 -0300)
We've seen cases (softice) where DWARF unwinder went through non
executable mmaps, which we need to lookup in MAP__VARIABLE tree.
Reported-and-Tested-by: Noel Grandin <noelgrandin@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link:
http://lkml.kernel.org/r/1452158050-28061-6-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/util/unwind-libdw.c
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diff --git
a/tools/perf/util/unwind-libdw.c
b/tools/perf/util/unwind-libdw.c
index db8142ba7cb9a72bd41d0129e9f3aed3ec58e520..cf5e250bc78e1a4c82a08fc2ea50d5876bec1c69 100644
(file)
--- a/
tools/perf/util/unwind-libdw.c
+++ b/
tools/perf/util/unwind-libdw.c
@@
-95,6
+95,16
@@
static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
MAP__FUNCTION, addr, &al);
+ if (!al.map) {
+ /*
+ * We've seen cases (softice) where DWARF unwinder went
+ * through non executable mmaps, which we need to lookup
+ * in MAP__VARIABLE tree.
+ */
+ thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
+ MAP__VARIABLE, addr, &al);
+ }
+
if (!al.map) {
pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
return -1;