[libunwind][AArch64] Fix _Unwind_ForcedUnwind via sigreturn.
When the sigreturn trampoline is found the unw_proc_info_t.end_ip need to be set to
indicate a stack frame is found.
Reviewed By: cjdb, #libunwind, MaskRay
Differential Revision: https://reviews.llvm.org/D124522
GitOrigin-RevId: f326df34bc179e41ea17d31e1ffba4a479e45589
diff --git a/test/forced_unwind4.pass.cpp b/test/forced_unwind4.pass.cpp
new file mode 100644
index 0000000..53a0121
--- /dev/null
+++ b/test/forced_unwind4.pass.cpp
@@ -0,0 +1,50 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: linux && target={{aarch64-.+}}
+
+// pthread_cancel in case of glibc calls _Unwind_ForcedUnwind from a signal on
+// the child_thread. This test ensures sigretrun is handled correctly (see:
+// UnwindCursor<A, R>::setInfoForSigReturn).
+
+#include <chrono>
+#include <condition_variable>
+#include <pthread.h>
+#include <unistd.h>
+
+using namespace std::chrono_literals;
+
+std::condition_variable cv;
+std::mutex cv_m;
+bool thread_ready = false;
+
+static void* test(void* arg) {
+ (void)arg;
+ thread_ready = true;
+ cv.notify_all();
+
+ // This must be a pthread cancellation point.
+ while (1)
+ sleep(100);
+
+ return (void*)1;
+}
+
+int main() {
+ pthread_t child_thread;
+ std::unique_lock<std::mutex> lk(cv_m);
+ pthread_create(&child_thread, 0, test, (void*)0);
+
+ if (!cv.wait_for(lk, 100ms, [] { return thread_ready; }))
+ return -1;
+
+ pthread_cancel(child_thread);
+ pthread_join(child_thread, NULL);
+ return 0;
+}
