--- /dev/null	2021-01-19 17:38:25.908523431 +0000
+++ new/src/cpu/aarch64/vm/aarch64Test.cpp	2021-01-25 19:31:23.812340635 +0000
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2014, 2020, Red Hat Inc.
+ * All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <stdlib.h>
+
+#include "precompiled.hpp"
+#include "code/codeBlob.hpp"
+#include "asm/macroAssembler.hpp"
+
+// hook routine called during JVM bootstrap to test AArch64 assembler
+
+extern "C" void entry(CodeBuffer*);
+
+#ifdef ASSERT
+void aarch64TestHook()
+{
+  BufferBlob* b = BufferBlob::create("aarch64Test", 500000);
+  CodeBuffer code(b);
+  entry(&code);
+  BufferBlob::free(b);
+}
+#endif