Added call registers

examples/hello/hello.q

@@ -1,8 +1,4 @@
 main() {
-	hello()
-}
-
-hello() {
 	address := 0
 	length := 0
 
@@ -15,6 +11,7 @@ hello() {
 	length *= 10
 	length /= 100
 	length = (0 + 50 - 20) * 10 / 100
+	length = 1
 
 	loop {
 		print(address, length)
@@ -22,7 +19,7 @@ hello() {
 }
 
 print(address, length) {
-	write(1, address, length)
+	write(length, address, length+1)
 }
 
 write(fd, address, length) {