simpleperf: fix dumping arm regs on arm64 devices.

On arm64 devices, the kernel dumps arm64 regs
even for 32-bit processes. So we need to map
from arm64 registers to arm registers.

Bug: http://b/30974693
Test: run simpleperf manually on one app.
Change-Id: Iffeac9510b418b5dabc0604c16523887d63bba49

1 files changed, 1 insertions, 1 deletions

diff --git a/simpleperf/event_selection_set.cpp b/simpleperf/event_selection_set.cpp
index 58c51296..6c45f150 100644
--- a/simpleperf/event_selection_set.cpp
+++ b/simpleperf/event_selection_set.cpp
@@ -280,7 +280,7 @@ bool EventSelectionSet::EnableDwarfCallChainSampling(uint32_t dump_stack_size) {
                                           PERF_SAMPLE_STACK_USER;
       selection.event_attr.exclude_callchain_user = 1;
       selection.event_attr.sample_regs_user =
-          GetSupportedRegMask(GetBuildArch());
+          GetSupportedRegMask(GetMachineArch());
       selection.event_attr.sample_stack_user = dump_stack_size;
     }
   }