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-rw-r--r--tools/perf/util/unwind-libunwind.c31
1 files changed, 20 insertions, 11 deletions
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index 6edf535f65c2..e3c40a520a25 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -266,14 +266,17 @@ static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine,
u64 *fde_count)
{
int ret = -EINVAL, fd;
- u64 offset;
+ u64 offset = dso->data.frame_offset;
- fd = dso__data_fd(dso, machine);
- if (fd < 0)
- return -EINVAL;
+ if (offset == 0) {
+ fd = dso__data_fd(dso, machine);
+ if (fd < 0)
+ return -EINVAL;
- /* Check the .eh_frame section for unwinding info */
- offset = elf_section_offset(fd, ".eh_frame_hdr");
+ /* Check the .eh_frame section for unwinding info */
+ offset = elf_section_offset(fd, ".eh_frame_hdr");
+ dso->data.frame_offset = offset;
+ }
if (offset)
ret = unwind_spec_ehframe(dso, machine, offset,
@@ -287,14 +290,20 @@ static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine,
static int read_unwind_spec_debug_frame(struct dso *dso,
struct machine *machine, u64 *offset)
{
- int fd = dso__data_fd(dso, machine);
+ int fd;
+ u64 ofs = dso->data.frame_offset;
- if (fd < 0)
- return -EINVAL;
+ if (ofs == 0) {
+ fd = dso__data_fd(dso, machine);
+ if (fd < 0)
+ return -EINVAL;
- /* Check the .debug_frame section for unwinding info */
- *offset = elf_section_offset(fd, ".debug_frame");
+ /* Check the .debug_frame section for unwinding info */
+ ofs = elf_section_offset(fd, ".debug_frame");
+ dso->data.frame_offset = ofs;
+ }
+ *offset = ofs;
if (*offset)
return 0;