diff options
| author | Jiri Olsa <jolsa@kernel.org> | 2016-01-07 10:14:02 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-01-08 14:16:57 -0300 |
| commit | 0ba98149f8c8b6b2ba36be9938afb731fa719004 (patch) | |
| tree | 8244c888b8b9a839810d35f96dcad2cbf12575e7 /tools/perf/util/unwind-libdw.c | |
| parent | 0ddf5246f70ecc04e1bb4c4dc2be65977d1c03a7 (diff) | |
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/util/unwind-libdw.c')
| -rw-r--r-- | tools/perf/util/unwind-libdw.c | 10 |
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; } |