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| author | Rabin Vincent <rabin.vincent@axis.com> | 2015-09-27 20:37:57 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-10-12 23:25:25 -0300 |
| commit | 8eac1d5e9256260b9cc3bfcdd9b8b995990950f5 (patch) | |
| tree | 0e397d62a4982904b86f2cc9c8c281c712785010 /tools/perf/util/unwind-libunwind.c | |
| parent | 4aa8e454d347a1c96a2322683a6798de7e17da5f (diff) | |
| download | lwn-8eac1d5e9256260b9cc3bfcdd9b8b995990950f5.tar.gz lwn-8eac1d5e9256260b9cc3bfcdd9b8b995990950f5.zip | |
perf callchain: Use debug_frame if eh_frame is unusable
When NO_LIBUNWIND_DEBUG_FRAME=0, use the .debug_frame if the .eh_frame
doesn't contain the approprate unwind tables.
Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rabin Vincent <rabinv@axis.com>
Link: http://lkml.kernel.org/r/1443379079-29133-3-git-send-email-rabin.vincent@axis.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/unwind-libunwind.c')
| -rw-r--r-- | tools/perf/util/unwind-libunwind.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c index 4c00507ee3fd..ea993f6c7e0c 100644 --- a/tools/perf/util/unwind-libunwind.c +++ b/tools/perf/util/unwind-libunwind.c @@ -330,6 +330,7 @@ find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi, struct map *map; unw_dyn_info_t di; u64 table_data, segbase, fde_count; + int ret = -EINVAL; map = find_map(ip, ui); if (!map || !map->dso) @@ -348,13 +349,14 @@ find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi, di.u.rti.table_data = map->start + table_data; di.u.rti.table_len = fde_count * sizeof(struct table_entry) / sizeof(unw_word_t); - return dwarf_search_unwind_table(as, ip, &di, pi, - need_unwind_info, arg); + ret = dwarf_search_unwind_table(as, ip, &di, pi, + need_unwind_info, arg); } #ifndef NO_LIBUNWIND_DEBUG_FRAME /* Check the .debug_frame section for unwinding info */ - if (!read_unwind_spec_debug_frame(map->dso, ui->machine, &segbase)) { + if (ret < 0 && + !read_unwind_spec_debug_frame(map->dso, ui->machine, &segbase)) { int fd = dso__data_get_fd(map->dso, ui->machine); int is_exec = elf_is_exec(fd, map->dso->name); unw_word_t base = is_exec ? 0 : map->start; @@ -370,7 +372,7 @@ find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi, } #endif - return -EINVAL; + return ret; } static int access_fpreg(unw_addr_space_t __maybe_unused as, |