diff --git a/aarch64-hello.s b/aarch64-hello.s
index 75b33a9..e0f7d53 100644
--- a/aarch64-hello.s
+++ b/aarch64-hello.s
@@ -1,6 +1,17 @@
-.global start
+.global main
+
+main:
+    stp x30, x19, [sp, -16]!
+    b start
+
+conclusion:
+    ldp x30, x19, [sp], 16
+	mov x8, 93 	// sys_exit() is at index 93 in kernel functions table
+	svc #0 		// generate kernel call sys_exit(123);
 
 start:
     mov x0, 1
+    str x0, [sp, -16]!
+    ldr x0, [sp], 16 
     add x0, x0, 41
     b conclusion
diff --git a/runtime.s b/runtime.s
index 406b1c3..8b13789 100644
--- a/runtime.s
+++ b/runtime.s
@@ -1,7 +1 @@
-.global main, conclusion
-main:
-    b start
 
-conclusion:
-	mov x8, 93 	// sys_exit() is at index 93 in kernel functions table
-	svc #0 		// generate kernel call sys_exit(123);