Added x86 package

src/x86/Push.go

@@ -0,0 +1,37 @@
+package x86
+
+import (
+	"git.urbach.dev/cli/q/src/cpu"
+	"git.urbach.dev/cli/q/src/sizeof"
+)
+
+// PushNumber pushes a number onto the stack.
+func PushNumber(code []byte, number int32) []byte {
+	length := sizeof.Signed(number)
+
+	if length >= 2 {
+		return append(
+			code,
+			0x68,
+			byte(number),
+			byte(number>>8),
+			byte(number>>16),
+			byte(number>>24),
+		)
+	}
+
+	return append(code, 0x6A, byte(number))
+}
+
+// PushRegister pushes the value inside the register onto the stack.
+func PushRegister(code []byte, register cpu.Register) []byte {
+	if register > 0b111 {
+		code = append(code, REX(0, 0, 0, 1))
+		register &= 0b111
+	}
+
+	return append(
+		code,
+		0x50+byte(register),
+	)
+}