22 lines
703 B
Zig
22 lines
703 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 format11(comptime L: bool, comptime rd: u3) InstrFn {
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return struct {
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fn inner(cpu: *Arm7tdmi, bus: *Bus, opcode: u16) void {
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const offset = (opcode & 0xFF) << 2;
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const address = cpu.r[13] + offset;
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if (L) {
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const value = bus.read32(address & 0xFFFF_FFFC);
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cpu.r[rd] = std.math.rotr(u32, value, 8 * (address & 0x3));
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} else {
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bus.write32(address & 0xFFFF_FFFC, cpu.r[rd]);
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}
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}
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}.inner;
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}
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