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authorJiri Olsa <jolsa@kernel.org>2016-01-07 12:14:02 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-01-08 20:16:57 +0300
commit0ba98149f8c8b6b2ba36be9938afb731fa719004 (patch)
tree8244c888b8b9a839810d35f96dcad2cbf12575e7 /tools/perf
parent0ddf5246f70ecc04e1bb4c4dc2be65977d1c03a7 (diff)
downloadlinux-0ba98149f8c8b6b2ba36be9938afb731fa719004.tar.xz
perf libdw: Check for mmaps also in MAP__VARIABLE tree
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>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/util/unwind-libdw.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index db8142ba7cb9..cf5e250bc78e 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -96,6 +96,16 @@ 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;
}