Improved file structure

src/arch/x64/Call.go

@@ -0,0 +1,14 @@
+package x64
+
+// Call places the return address on the top of the stack and continues
+// program flow at the new address. The address is relative to the next instruction.
+func Call(code []byte, address uint32) []byte {
+	return append(
+		code,
+		0xe8,
+		byte(address),
+		byte(address>>8),
+		byte(address>>16),
+		byte(address>>24),
+	)
+}