Draft: lab 5 failed

userprog/lib/syscall.S

@@ -0,0 +1,13 @@
+.global syscall
+syscall:
+	mov x8, x0
+	mov x0, x1
+	mov x1, x2
+	mov x2, x3
+	mov x3, x4
+	mov x4, x5
+	mov x5, x6
+	mov x6, x7
+
+	svc 0
+	ret