feat(cpu): implement THUMB format11

src/cpu/thumb/format11.zig

@@ -0,0 +1,21 @@
+const std = @import("std");
+
+const Bus = @import("../../Bus.zig");
+const Arm7tdmi = @import("../../cpu.zig").Arm7tdmi;
+const InstrFn = @import("../../cpu.zig").ThumbInstrFn;
+
+pub fn format11(comptime L: bool, comptime rd: u3) InstrFn {
+    return struct {
+        fn inner(cpu: *Arm7tdmi, bus: *Bus, opcode: u16) void {
+            const offset = (opcode & 0xFF) << 2;
+            const address = cpu.r[13] + offset;
+
+            if (L) {
+                const value = bus.read32(address & 0xFFFF_FFFC);
+                cpu.r[rd] = std.math.rotr(u32, value, 8 * (address & 0x3));
+            } else {
+                bus.write32(address & 0xFFFF_FFFC, cpu.r[rd]);
+            }
+        }
+    }.inner;
+}