Commit-ID: 303cb89a6d708da9c24f6f3390ff68a2bd822a13
Gitweb: http://git.kernel.org/tip/303cb89a6d708da9c24f6f3390ff68a2bd822a13
Author: Wang Nan <wangn...@huawei.com>
AuthorDate: Fri, 13 Mar 2015 15:02:56 +0800
Committer: Arnaldo Carvalho de Melo <a...@redhat.com>
CommitDate: Thu, 19 Mar 2015 13:53:27 -0300
perf callchain: Separate eh/debug frame offset cache.
Commit f1f13af99a90 ("perf callchain: Cache eh/debug frame offset for
dwarf unwind") introduces a cache for .debug_frame and .eh_frame_hdr.
Unfortunately, it makes them share a same cache (dso->frame_offset).
Which causes unwind failure on ARM:
$ perf test unwind
Test dwarf unwind: FAILED!
The reason is that, if a dso has '.debug_frame' but doesn't have
'.eh_frame_hdr' (like ARM), dso->frame_offset will be filled by offset
of '.debug_frame' during the first time calling of find_proc_info() ->
read_unwind_spec_debug_frame(), and be regarded to '.eh_frame_hdr' when
the second time calling of find_proc_info() ->
read_unwind_spec_eh_frame(), since '.eh_frame_hdr' is checked prior to
'.debug_frame'.
This patch solves the problem by creating two cache fields for
'.eh_frame_hdr' and '.debug_frame'.
Signed-off-by: Wang Nan <wangn...@huawei.com>
Acked-by: Jiri Olsa <jo...@redhat.com>
Acked-by: Namhyung Kim <namhy...@kernel.org>
Cc: Li Zefan <lize...@huawei.com>
Link: http://lkml.kernel.org/r/55028ba0.1030...@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
tools/perf/util/dso.h | 3 ++-
tools/perf/util/unwind-libunwind.c | 8 ++++----
2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index ced9284..408c65f 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -139,7 +139,8 @@ struct dso {
u32 status_seen;
size_t file_size;
struct list_head open_entry;
- u64 frame_offset;
+ u64 debug_frame_offset;
+ u64 eh_frame_hdr_offset;
} data;
union { /* Tool specific area */
diff --git a/tools/perf/util/unwind-libunwind.c
b/tools/perf/util/unwind-libunwind.c
index e3c40a5..7b09a44 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -266,7 +266,7 @@ static int read_unwind_spec_eh_frame(struct dso *dso,
struct machine *machine,
u64 *fde_count)
{
int ret = -EINVAL, fd;
- u64 offset = dso->data.frame_offset;
+ u64 offset = dso->data.eh_frame_hdr_offset;
if (offset == 0) {
fd = dso__data_fd(dso, machine);
@@ -275,7 +275,7 @@ static int read_unwind_spec_eh_frame(struct dso *dso,
struct machine *machine,
/* Check the .eh_frame section for unwinding info */
offset = elf_section_offset(fd, ".eh_frame_hdr");
- dso->data.frame_offset = offset;
+ dso->data.eh_frame_hdr_offset = offset;
}
if (offset)
@@ -291,7 +291,7 @@ static int read_unwind_spec_debug_frame(struct dso *dso,
struct machine *machine, u64 *offset)
{
int fd;
- u64 ofs = dso->data.frame_offset;
+ u64 ofs = dso->data.debug_frame_offset;
if (ofs == 0) {
fd = dso__data_fd(dso, machine);
@@ -300,7 +300,7 @@ static int read_unwind_spec_debug_frame(struct dso *dso,
/* Check the .debug_frame section for unwinding info */
ofs = elf_section_offset(fd, ".debug_frame");
- dso->data.frame_offset = ofs;
+ dso->data.debug_frame_offset = ofs;
}
*offset = ofs;
--
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