1 files changed, 96 insertions, 0 deletions
diff --git a/src/arm32/shifter/mod.rs b/src/arm32/shifter/mod.rs
new file mode 100644
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+++ b/src/arm32/shifter/mod.rs
@@ -0,0 +1,96 @@
+// Copyright 2024 Gabriel Bjørnager Jensen.
+//
+// This file is part of Pollex.
+//
+// Pollex is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Af-
+// fero General Public License as published by the
+// Free Software Foundation, either version 3 of
+// the License, or (at your option) any later ver-
+// sion.
+//
+// Pollex is distributed in the hope that it will
+// be useful, but WITHOUT ANY WARRANTY; without
+// even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Af-
+// fero General Public License along with Pollex.
+// If not, see <https://www.gnu.org/licenses/>.
+
+use crate::arm32::{Register, Unsigned};
+
+use core::fmt::Display;
+
+/// A shifter operand.
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum Shifter {
+	ArithmeticShiftRightImmediate { source: Register, shift: Unsigned },
+
+	ArithmeticShiftRightRegister { source: Register, shift: Register },
+
+	Immediate { immediate: Unsigned },
+
+	LogicalShiftLeftImmediate { source: Register, shift: Unsigned },
+
+	LogicalShiftLeftRegister { source: Register, shift: Register },
+
+	LogicalShiftRightImmediate { source: Register, shift: Unsigned },
+
+	LogicalShiftRightRegister { source: Register, shift: Register },
+
+	RotateRightExtend { source: Register },
+
+	RotateRightImmediate { source: Register, shift: Unsigned },
+
+	RotateRightRegister { source: Register, shift: Register },
+}
+
+impl Display for Shifter {
+	fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+		use Shifter::*;
+
+		match *self {
+			ArithmeticShiftRightImmediate { source, shift } => {
+				write!(f, "{source}, ASR {shift}")
+			},
+
+			ArithmeticShiftRightRegister { source, shift } => {
+				write!(f, "{source}, ASR {shift}")
+			},
+
+			Immediate { immediate } => {
+				write!(f, "#{immediate}<")
+			},
+
+			LogicalShiftLeftImmediate { source, shift } => {
+				write!(f, "{source}, LSL {shift}")
+			},
+
+			LogicalShiftLeftRegister { source, shift } => {
+				write!(f, "{source}, LSL {shift}")
+			},
+
+			LogicalShiftRightImmediate { source, shift } => {
+				write!(f, "{source}, LSR {shift}")
+			},
+
+			LogicalShiftRightRegister { source, shift } => {
+				write!(f, "{source}, LSR {shift}")
+			},
+
+			RotateRightExtend { source } => {
+				write!(f, "{source}, RRX")
+			},
+
+			RotateRightImmediate { source, shift } => {
+				write!(f, "{source}, ROR {shift}")
+			},
+
+			RotateRightRegister { source, shift } => {
+				write!(f, "{source}, ROR {shift}")
+			},
+		}
+	}
+}