public void TestNOP()
{
var registers = Mock.Of <IRegisters>();
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.NOP, new byte[] { 0, 0, 0 });
var operation = sut[Opcodes.NOP];
operation(instruction, registers, bus);
}
public void TestJDoesNotPerformJMPWhenTheParameterIsZero()
{
var registers = Mock.Of <IRegisters>();
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.J, new byte[] { 0x0, 0xcd, 0xab });
var operation = sut[Opcodes.J];
operation(instruction, registers, bus);
Mock.Get(registers).VerifySet(r => r.PC = 0xabcd, Times.Never);
}
public void TestSPR()
{
var registers = Mock.Of <IRegisters>();
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var operation = sut[Opcodes.SPR];
var parameters = new byte[] { 0, 0x10, 0x20 };
var instruction = new Instruction(Opcodes.SPR, parameters);
operation(instruction, registers, bus);
Mock.Get(bus).Verify(b => b.SendCommandToGPU(GPUCommands.SPR, parameters));
}
public void TestJMP()
{
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.JMP, new byte[] { 0x00, 0xcd, 0xab });
var bus = new Mock <IBus>();
var registers = new Mock <IRegisters>();
var operation = sut[Opcodes.JMP];
operation(instruction, registers.Object, bus.Object);
registers.VerifySet(r => r.PC = 0xABCD);
}
public void TSTISetsZeroFlag()
{
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(new short[16]);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.TSTI, new byte[] { 0x0a, 0x00, 0x00 });
var operation = sut[Opcodes.TSTI];
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetZeroFlag(true));
}
public void TSTIUnsetsNegativeFlag()
{
var registers = Mock.Of <IRegisters>();
var gp = new short[16];
gp[0] = unchecked ((short)0xffff);
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.TSTI, new byte[] { 0x00, 0x00, 0x0f });
var operation = sut[Opcodes.TSTI];
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetNegativeFlag(false));
}
public void TestPUSHF()
{
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).SetupGet(r => r.SP).Returns(0xabcd);
Mock.Get(registers).SetupGet(r => r.FLAGS).Returns(0b10101010);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var operation = sut[Opcodes.PUSHF];
var instruction = new Instruction(Opcodes.PUSHF, new byte[] { 0, 0, 0 });
operation(instruction, registers, bus);
Mock.Get(bus).Verify(b => b.Write(0xabcd, 0b10101010));
Mock.Get(registers).Verify(r => r.IncrementSP());
}
public void TestCMPISetsOverflowFlagToFalse()
{
var gp = new short[16];
gp[2] = 0x1;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var operation = sut[Opcodes.CMPI];
var instruction = new Instruction(Opcodes.CMPI, new byte[] { 0x2, 0, 0 });
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetOverflowFlag(false));
}
public void TestMOV()
{
unchecked
{
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.MOV, new byte[] { 0xab, 0, 0 });
var bus = new Mock <IBus>();
var gp = new short[16];
gp[0x0a] = (short)0xdead;
var registers = new Mock <IRegisters>();
registers.Setup(r => r.GP).Returns(gp);
var operation = sut[Opcodes.MOV];
operation(instruction, registers.Object, bus.Object);
gp[0x0b].Should().Be((short)0xdead);
}
}
public void TestADDISetsCarryFlag()
{
var gp = new short[16];
gp[1] = 1;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instructrion = new Instruction(Opcodes.ADDI, new byte[] { 0x1, 0xff, 0xff });
var operation = sut[Opcodes.ADDI];
operation(instructrion, registers, bus);
Mock.Get(registers).Verify(r => r.SetCarryFlag(true));
}
public void TestXORSetsZeroFlag()
{
var gp = new short[16];
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.XOR, new byte[] { 0x10, 0, 0 });
var operation = sut[Opcodes.XOR];
operation(instruction, registers, bus);
gp[0].Should().Be(0);
Mock.Get(registers).Verify(r => r.SetZeroFlag(true));
Mock.Get(registers).Verify(r => r.SetNegativeFlag(false));
}
public void TestCMPISetsNegativeFlagToFalseWhenTheResultIsPositive()
{
var gp = new short[16];
gp[2] = 2;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var operation = sut[Opcodes.CMPI];
var instruction = new Instruction(Opcodes.CMPI, new byte[] { 0x2, 0x01, 0x0 });
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetNegativeFlag(false));
}
public void TestADDSetsCarryFlag()
{
var gp = new short[16];
gp[2] = unchecked ((short)0xffff);
gp[4] = 1;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.ADD, new byte[] { 0x42, 0, 0 });
var operation = sut[Opcodes.ADD];
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetCarryFlag(true));
}
public void TestORSetsNegativeFlag(int operand1, int operand2, bool flag)
{
var gp = new short[16];
gp[2] = (short)operand1;
gp[4] = (short)operand2;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.OR, new byte[] { 0x42, 0, 0 });
var operation = sut[Opcodes.OR];
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetNegativeFlag(flag));
}
public void TestSTM()
{
unchecked
{
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.STM, new byte[] { 0x2, 0xcd, 0xab });
var bus = new Mock <IBus>();
var registers = new Mock <IRegisters>();
var gp = new short[16];
short value = (short)0xdead;
gp[0x2] = value;
registers.Setup(r => r.GP).Returns(gp);
var operation = sut[Opcodes.STM];
operation(instruction, registers.Object, bus.Object);
bus.Verify(b => b.Write(0xabcd, (short)0xdead));
}
}
public void TestSHRSetsTheZeroFlag(short operand1, byte operand2, bool flag)
{
var gp = new short[16];
gp[2] = operand1;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var operation = sut[Opcodes.SHR];
var instruction = new Instruction(Opcodes.SHR, new byte[] { 0x2, operand2, 0 });
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetZeroFlag(flag));
}
public void TestSUBSetsOverflowFlag()
{
var gp = new short[16];
gp[2] = 0x1;
gp[4] = 0x7fff;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.SUB, new byte[] { 0x42, 0, 0 });
var operation = sut[Opcodes.SUB];
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetOverflowFlag(true));
}
public void TestADDSetsNegativeFlag()
{
var gp = new short[16];
gp[2] = 0;
gp[4] = -1;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.ADD, new byte[] { 0x42, 0, 0 });
var operation = sut[Opcodes.ADD];
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetNegativeFlag(true));
gp[2].Should().Be(-1);
}
public void TestMUL2SetsCarryFlag()
{
var gp = new short[16];
gp[2] = 0x2000;
gp[4] = 0x0100;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.MUL2, new byte[] { 0x42, 0x08, 0 });
var operation = sut[Opcodes.MUL2];
operation(instruction, registers, bus);
Mock.Get(registers).Verify(r => r.SetCarryFlag(true));
}
public void TestMUL2()
{
var gp = new short[16];
gp[2] = 2;
gp[4] = 3;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.MUL2, new byte[] { 0x42, 0x08, 0 });
var operation = sut[Opcodes.MUL2];
operation(instruction, registers, bus);
gp[8].Should().Be(6);
}
public void TestDiv2SetsZeroFlag()
{
var gp = new short[16];
gp[2] = 0;
gp[4] = 5;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.DIV2, new byte[] { 0x42, 0x08, 0 });
var operation = sut[Opcodes.DIV2];
operation(instruction, registers, bus);
gp[8].Should().Be(0);
Mock.Get(registers).Verify(r => r.SetZeroFlag(true));
}
public void TestRET()
{
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.SP).Returns(0);
var bus = Mock.Of <IBus>();
Mock.Get(bus).Setup(b => b.Read16(0)).Returns(unchecked ((short)0xabcd));
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.RET, new byte[] { 0, 0, 0 });
var operation = sut[Opcodes.RET];
operation(instruction, registers, bus);
//Decrease SP by 2
Mock.Get(registers).Verify(r => r.DecrementSP());
//set PC to [SP]
Mock.Get(registers).VerifySet(r => r.PC = 0xabcd);
}
public void TestLDM()
{
unchecked
{
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.LDM, new byte[] { 0x1, 0xcd, 0xab });
var bus = new Mock <IBus>();
bus.Setup(b => b.Read16(It.IsAny <ushort>())).Returns((short)0xdead);
var gp = new short[16];
var registers = new Mock <IRegisters>();
registers.Setup(r => r.GP).Returns(gp);
var operation = sut[Opcodes.LDM];
operation(instruction, registers.Object, bus.Object);
bus.Verify(b => b.Read16(0xabcd));
gp[0x1].Should().Be((short)0xdead);
}
}
public void TestLDI()
{
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.LDI, new byte[] { 0xa, 0xcd, 0xab });
var bus = new Mock <IBus>();
var registers = new Mock <IRegisters>();
var gp = new short[16];
registers.Setup(r => r.GP).Returns(gp);
var operation = sut[Opcodes.LDI];
operation(instruction, registers.Object, bus.Object);
unchecked
{
gp[0xa].Should().Be((short)0xabcd);
}
}
public void TestSHL2()
{
var gp = new short[16];
gp[2] = 2;
gp[4] = 1;
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
var bus = Mock.Of <IBus>();
var sut = new InstructionsetFactory().CreateInstructionset();
var operation = sut[Opcodes.SHL2];
var instruction = new Instruction(Opcodes.SHL2, new byte[] { 0x42, 0, 0 });
operation(instruction, registers, bus);
gp[2].Should().Be(4);
Mock.Get(registers).Verify(r => r.SetZeroFlag(false));
Mock.Get(registers).Verify(r => r.SetNegativeFlag(false));
}
public void TestCall()
{
unchecked
{
var sut = new InstructionsetFactory().CreateInstructionset();
var instruction = new Instruction(Opcodes.CALL, new byte[] { 0, 0xcd, 0xab });
var bus = new Mock <IBus>();
var registers = new Mock <IRegisters>();
registers.Setup(r => r.PC).Returns(0xeeee);
registers.Setup(r => r.SP).Returns(0xff00);
var operation = sut[Opcodes.CALL];
operation(instruction, registers.Object, bus.Object);
//store pc to [sp]
bus.Verify(b => b.Write(0xff00, (short)0xeeee));
//inc sp by 2
registers.Verify(r => r.IncrementSP());
//set pc to 0xabcd
registers.VerifySet(r => r.PC = 0xabcd);
}
}
public void TestPOP()
{
var gp = new short[16];
var registers = Mock.Of <IRegisters>();
Mock.Get(registers).Setup(r => r.GP).Returns(gp);
Mock.Get(registers).SetupGet(r => r.SP).Returns(0xabcd);
var bus = Mock.Of <IBus>();
Mock.Get(bus).Setup(b => b.Read16(It.IsAny <ushort>())).Returns(unchecked ((short)0xdead));
var sut = new InstructionsetFactory().CreateInstructionset();
var operation = sut[Opcodes.POP];
var instruction = new Instruction(Opcodes.POP, new byte[] { 0x02, 0, 0 });
operation(instruction, registers, bus);
//SP--
Mock.Get(registers).Verify(r => r.DecrementSP());
//RX = Read16(SP)
Mock.Get(bus).Verify(b => b.Read16(0xabcd));
gp[2].Should().Be(unchecked ((short)0xdead));
}