32 lines
1023 B
Zig
32 lines
1023 B
Zig
const std = @import("std");
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const Bus = @import("../../Bus.zig");
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const Arm7tdmi = @import("../../cpu.zig").Arm7tdmi;
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const InstrFn = @import("../../cpu.zig").ThumbInstrFn;
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pub fn format3(comptime op: u2, comptime rd: u3) InstrFn {
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return struct {
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fn inner(cpu: *Arm7tdmi, _: *Bus, opcode: u16) void {
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const offset = @truncate(u8, opcode);
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switch (op) {
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0b00 => {
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cpu.r[rd] = offset;
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cpu.cpsr.n.unset();
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cpu.cpsr.z.write(offset == 0);
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},
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0b01 => {
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std.debug.panic("TODO: Implement cmp R{}, #0x{X:0>2}", .{ rd, offset });
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},
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0b10 => {
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std.debug.panic("TODO: Implement add R{}, #0x{X:0>2}", .{ rd, offset });
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},
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0b11 => {
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std.debug.panic("TODO: Implement sub R{}, #0x{X:0>2}", .{ rd, offset });
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},
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}
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}
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}.inner;
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}
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