[libunwind][SystemZ] Unwind out of signal handlers
Unwinding out of signal handlers currently does not work since
the sigreturn trampoline is not annotated with CFI data.
Fix this by detecting the sigreturn trampoline during unwinding
and providing appropriate unwind data manually. This follows
closely the approach used by existing code for the AArch64 target.
Reviewed by: MaskRay
Differential Revision: https://reviews.llvm.org/D124765
NOKEYCHECK=True
GitOrigin-RevId: 71672375fe91d602699ae2a6d6a88e910ff91b5c
diff --git a/test/signal_unwind.pass.cpp b/test/signal_unwind.pass.cpp
index 4f2e925..2ff50ab 100644
--- a/test/signal_unwind.pass.cpp
+++ b/test/signal_unwind.pass.cpp
@@ -8,7 +8,7 @@
//===----------------------------------------------------------------------===//
// Ensure that the unwinder can cope with the signal handler.
-// REQUIRES: linux && (target={{aarch64-.+}} || target={{x86_64-.+}})
+// REQUIRES: linux && (target={{aarch64-.+}} || target={{s390x-.+}} || target={{x86_64-.+}})
// TODO: Figure out why this fails with Memory Sanitizer.
// XFAIL: msan