};// TODO handle that in Instruc...
public static Action ret(CPU cpu, FlagCondition o) =>
() => {
if (o.Target) {
cpu.Return();
cpu.pc -= 1;
}
};
public static Action add(CPU cpu, Register16 o1, Register16 o2) =>
() => {
ushort hl = o1.Target;
o1.Target += o2.Target;
cpu.HalfCarry = (hl & 0xFFF) + (o2.Target & 0xFFF) > 0xFFF;
cpu.AddSub = false;
cpu.Carry = hl + o2.Target > 0xFFFF;
};
public static Action inc(CPU cpu, Operand<byte> o) =>
() => {
++o.Target;
cpu.Sign = o.Target > 0x7F;
cpu.Zero = o.Target == 0;
cpu.HalfCarry = (o.Target & 0x0F) == 0;
cpu.Overflow = o.Target == 0x80;
cpu.AddSub = false;
};
public static Action dec(CPU cpu, Operand<byte> o) =>
() => {
--o.Target;
cpu.Sign = o.Target > 0x7F;
cpu.Zero = o.Target == 0;
cpu.HalfCarry = (o.Target & 0x0F) == 0x0F;
cpu.Overflow = o.Target == 0x7F;
cpu.AddSub = true;
};
public static Action rla(CPU cpu) =>
() => {
bool bit7 = Utils.Bit(cpu.registers.a, 7);
cpu.registers.a <<= 1;
cpu.registers.a = Utils.Bit(cpu.registers.a, 0, cpu.Carry);
cpu.HalfCarry = false;
cpu.AddSub = false;
cpu.Carry = bit7;
};
public static Action rra(CPU cpu) =>
() => {
bool bit0 = Utils.Bit(cpu.registers.a, 0);
cpu.registers.a >>= 1;
cpu.registers.a = Utils.Bit(cpu.registers.a, 7, cpu.Carry);
cpu.HalfCarry = false;
cpu.AddSub = false;
cpu.Carry = bit0;
};
public static Action adc(CPU cpu, Register8 o1, Operand<byte> o2) =>
() => {
cpu.registers.a += (byte)(o2.Target + Convert.ToByte(cpu.Carry));
cpu.Sign = cpu.registers.a > 0x7F;
cpu.Zero = cpu.registers.a == 0;
cpu.HalfCarry = true; // TODO
cpu.Overflow = true; // TODO
cpu.AddSub = false;
cpu.Carry = false; // TODO
};
public static Action sub(CPU cpu, Operand<byte> o2) =>
() => {
cpu.registers.a -= o2.Target;
cpu.Sign = cpu.registers.a > 0x7F;
cpu.Zero = cpu.registers.a == 0;
cpu.HalfCarry = true; // TODO
cpu.Overflow = true; // TODO
cpu.AddSub = true;
cpu.Carry = false; // TODO
};
public static Action adc(CPU cpu, Register16 o1, Register16 o2) =>
() => {
cpu.registers.hl += (ushort)(o2.Target + Convert.ToByte(cpu.Carry));
cpu.Sign = cpu.registers.a > 0x7F;
cpu.Zero = cpu.registers.a == 0;
cpu.HalfCarry = true; // TODO
cpu.Overflow = true; // TODO
cpu.AddSub = false;
cpu.Carry = false; // TODO
};
public static Action add(CPU cpu, Register8 o1, Operand<byte> o2) =>
() => {
byte a = o1.Target;
o1.Target += o2.Target;
cpu.Sign = o1.Target > 0x7F;
cpu.Zero = o1.Target == 0;
cpu.HalfCarry = (a & 0x0F) + (o2.Target & 0x0F) > 0x0F;
cpu.Overflow = Utils.Sign(a) == Utils.Sign(o2.Target) &&
Utils.Sign(a) != Utils.Sign(o1.Target);
cpu.AddSub = false;
cpu.Carry = a + o2.Target > 0xFF;
};
public Instruction(CPU cpu, byte opcode, string mnemonics, string description, byte size, byte cycles, Action implementation) {
info = new Info {
opcode = opcode,
mnemonics = mnemonics,
description = description,
size = size,
cycles = cycles
};
this.implementation = implementation;
this.cpu = cpu;
}
public static Action pop(CPU cpu, Register16 o) => () => o.Target = cpu.Pop();
public static Action res(CPU cpu, Fixed bit, Operand<byte> value) => () => value.Target = Utils.SetBit(value.Target, bit.Target);
public static Action rst(CPU cpu, Fixed o) => () => cpu.Call(o.Target, 1);
public static Action push(CPU cpu, Register16 o) => () => cpu.Push(o.Target);
public static Action ret(CPU cpu) =>
() => {
cpu.Return();
cpu.pc -= 1;
};// TODO handle that in Instruc...
public static Action inc(CPU cpu, Register16 o) => () => ++o.Target;
public static Action call(CPU cpu, Immediate<ushort> o) => () => cpu.Call(o.Target, 3);
public static Action sbc(CPU cpu, Register16 o1, Operand<ushort> o) =>
() => {
cpu.registers.hl -= o.Target;
cpu.Sign = cpu.registers.hl > 0x7F;
cpu.Zero = cpu.registers.hl == 0;
cpu.HalfCarry = true; // TODO
cpu.Overflow = true; // TODO
cpu.AddSub = true;
cpu.Carry = false; // TODO
};
public static Action jp(CPU cpu, Operand<ushort> o) => () => cpu.pc = (ushort) (o.Target - 3); // TODO handle adjustment in Instr
() => cpu.pc = (ushort) (o.Target - 3); // TODO handle adjustment in Instr
public static Action jp(CPU cpu, FlagCondition o1, Operand<ushort> o2) =>
() => {
if (o1.Target)
cpu.pc = (ushort) (o2.Target - 3);
};
public static Action xor(CPU cpu, Operand<byte> o) =>
() => {
cpu.registers.a ^= o.Target;
cpu.Sign = cpu.registers.a > 0x7F;
cpu.Zero = cpu.registers.a == 0;
cpu.HalfCarry = false;
cpu.Overflow = Utils.Parity(cpu.registers.a);
cpu.AddSub = false;
cpu.Carry = false;
};
public static Action bit(CPU cpu, Fixed bit, Operand<byte> value) =>
() => {
cpu.Zero = Utils.Bit(value.Target, bit.Target);
cpu.HalfCarry = true;
cpu.AddSub = false;
};
public static Action jr(CPU cpu, Operand<byte> o) => () => cpu.pc += (ushort) Utils.Signed(o.Target);
public static Action cpl(CPU cpu) =>
() => {
cpu.registers.a = (byte) ~cpu.registers.a;
cpu.HalfCarry = true;
cpu.AddSub = true;
};
public static Action call(CPU cpu, FlagCondition o1, Immediate<ushort> o2) =>
() => {
if (o1.Target)
cpu.Call(o2.Target, 3);
};
public static Action jr(CPU cpu, FlagCondition o1, Operand<byte> o2) =>
() => {
if (o1.Target)
cpu.pc = (ushort) (cpu.pc + Utils.Signed(o2.Target));
};
public static Action dec(CPU cpu, Register16 o) => () => --o.Target;
public MasterSystem() {
memory = new Memory();
cpu = new CPU(memory);
}
public static Action djnz(CPU cpu, Immediate8 o) =>
() => {
if (--cpu.registers.b == 0)
cpu.pc += o.Target;
};
