libbacktrace_offline: support .ARM.exidx.
1. Read .ARM.exidx and .ARM.extab, provides these data to libunwind
through AccessMem.
2. In FindProcInfo, search .ARM.exidx for the idx entry of function
containing ip.
3. Add structures to store .ARM.exidx info in DebugFrameInfo, and
clean up the structure.
4. Add tests to test each unwind information (.eh_frame, .debug_frame,
.gnu_debugdata, .ARM.exidx) separately.
Bug: http://b/30974693
Test: run backtrace_test.
Test: run simpleperf runtest.py.
Change-Id: I9377a54379158bd35860efcf0e011423be7350d4
diff --git a/libbacktrace/backtrace_testlib.c b/libbacktrace/backtrace_testlib.c
index d4d15db..6f6b535 100644
--- a/libbacktrace/backtrace_testlib.c
+++ b/libbacktrace/backtrace_testlib.c
@@ -14,6 +14,7 @@
* limitations under the License.
*/
+#include <libunwind.h>
#include <stdio.h>
int test_level_four(int one, int two, int three, int four,
@@ -53,3 +54,23 @@
}
return 0;
}
+
+typedef struct {
+ unw_context_t* unw_context;
+ volatile int* exit_flag;
+} GetContextArg;
+
+static void GetContextAndExit(void* data) {
+ GetContextArg* arg = (GetContextArg*)data;
+ unw_getcontext(arg->unw_context);
+ // Don't touch the stack anymore.
+ while (*arg->exit_flag == 0) {
+ }
+}
+
+void test_get_context_and_wait(unw_context_t* unw_context, volatile int* exit_flag) {
+ GetContextArg arg;
+ arg.unw_context = unw_context;
+ arg.exit_flag = exit_flag;
+ test_level_one(1, 2, 3, 4, GetContextAndExit, &arg);
+}