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namespace Q1.core.Arch;
using Components;
public static class AddressingModes
{
public static AddressingMode[] Lookup = new AddressingMode[8];
static AddressingModes()
{
AddressingModes.Lookup[0x00] = new AddressingMode
{
Name = "Implicit",
SizeB = 0,
SizeW = 0,
LoadByte = AddressingModes.ImplicitLoadByte,
LoadWord = AddressingModes.ImplicitLoadWord,
StoreByte = AddressingModes.ImplicitStoreByte,
StoreWord = AddressingModes.ImplicitStoreWord
};
AddressingModes.Lookup[0x01] = new AddressingMode
{
Name = "Immediate",
SizeB = 1,
SizeW = 2,
LoadByte = AddressingModes.ImmediateLoadByte,
LoadWord = AddressingModes.ImmediateLoadWord,
StoreByte = AddressingModes.ImmediateStoreByte,
StoreWord = AddressingModes.ImmediateStoreWord
};
AddressingModes.Lookup[0x02] = new AddressingMode
{
Name = "Direct",
SizeB = 2,
SizeW = 2,
LoadByte = AddressingModes.DirectLoadByte,
LoadWord = AddressingModes.DirectLoadWord,
StoreByte = AddressingModes.DirectStoreByte,
StoreWord = AddressingModes.DirectStoreWord
};
AddressingModes.Lookup[0x03] = new AddressingMode
{
Name = "Indirect",
SizeB = 2,
SizeW = 2,
LoadByte = AddressingModes.IndirectLoadByte,
LoadWord = AddressingModes.IndirectLoadWord,
StoreByte = AddressingModes.IndirectStoreByte,
StoreWord = AddressingModes.IndirectStoreWord
};
AddressingModes.Lookup[0x04] = new AddressingMode
{
Name = "Relative",
SizeB = 2,
SizeW = 2,
LoadByte = AddressingModes.RelativeLoadByte,
LoadWord = AddressingModes.RelativeLoadWord,
StoreByte = AddressingModes.RelativeStoreByte,
StoreWord = AddressingModes.RelativeStoreWord
};
AddressingModes.Lookup[0x05] = new AddressingMode
{
Name = "Register",
SizeB = 1,
SizeW = 1,
LoadByte = AddressingModes.RegisterLoadByte,
LoadWord = AddressingModes.RegisterLoadWord,
StoreByte = AddressingModes.RegisterStoreByte,
StoreWord = AddressingModes.RegisterStoreWord
};
AddressingModes.Lookup[0x06] = new AddressingMode
{
Name = "Register Indirect",
SizeB = 1,
SizeW = 1,
LoadByte = AddressingModes.RegisterIndirectLoadByte,
LoadWord = AddressingModes.RegisterIndirectLoadWord,
StoreByte = AddressingModes.RegisterIndirectStoreByte,
StoreWord = AddressingModes.RegisterIndirectStoreWord
};
AddressingModes.Lookup[0x07] = new AddressingMode
{
Name = "Register Indirect with Offset",
SizeB = 3,
SizeW = 3,
LoadByte = AddressingModes.RegisterIndirectOffsetLoadByte,
LoadWord = AddressingModes.RegisterIndirectOffsetLoadWord,
StoreByte = AddressingModes.RegisterIndirectOffsetStoreByte,
StoreWord = AddressingModes.RegisterIndirectOffsetStoreWord
};
}
private static u8 ImplicitLoadByte(Chip chip)
=> throw new InvalidOperationException("Cannot load from an implicit value");
private static u16 ImplicitLoadWord(Chip chip)
=> throw new InvalidOperationException("Cannot load from an implicit value");
private static void ImplicitStoreByte(Chip chip, u8 value)
=> throw new InvalidOperationException("Cannot store to an implicit value");
private static void ImplicitStoreWord(Chip chip, u16 value)
=> throw new InvalidOperationException("Cannot store to an implicit value");
private static u8 ImmediateLoadByte(Chip chip)
{
u8 value = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
return value;
}
private static u16 ImmediateLoadWord(Chip chip)
{
u16 value = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
return value;
}
private static void ImmediateStoreByte(Chip chip, u8 value)
=> throw new InvalidOperationException("Cannot store to an immediate value");
private static void ImmediateStoreWord(Chip chip, u16 value)
=> throw new InvalidOperationException("Cannot store to an immediate value");
private static u8 DirectLoadByte(Chip chip)
{
u16 address = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
return chip.Bus.Read(address);
}
private static u16 DirectLoadWord(Chip chip)
{
u16 address = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
return chip.Bus.ReadWord(address);
}
private static void DirectStoreByte(Chip chip, u8 value)
{
u16 address = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
chip.Bus.Write(address, value);
}
private static void DirectStoreWord(Chip chip, u16 value)
{
u16 address = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
chip.Bus.WriteWord(address, value);
}
private static u8 IndirectLoadByte(Chip chip)
{
u16 pointer = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = chip.Bus.ReadWord(pointer);
return chip.Bus.Read(address);
}
private static u16 IndirectLoadWord(Chip chip)
{
u16 pointer = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = chip.Bus.ReadWord(pointer);
return chip.Bus.ReadWord(address);
}
private static void IndirectStoreByte(Chip chip, u8 value)
{
u16 pointer = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = chip.Bus.ReadWord(pointer);
chip.Bus.Write(address, value);
}
private static void IndirectStoreWord(Chip chip, u16 value)
{
u16 pointer = chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = chip.Bus.ReadWord(pointer);
chip.Bus.WriteWord(address, value);
}
private static u8 RelativeLoadByte(Chip chip)
{
i16 offset = (i16) chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = (u16) (chip.Pc + offset);
return chip.Bus.Read(address);
}
private static u16 RelativeLoadWord(Chip chip)
{
i16 offset = (i16) chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = (u16) (chip.Pc + offset);
return chip.Bus.ReadWord(address);
}
private static void RelativeStoreByte(Chip chip, u8 value)
{
i16 offset = (i16) chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = (u16) (chip.Pc + offset);
chip.Bus.Write(address, value);
}
private static void RelativeStoreWord(Chip chip, u16 value)
{
i16 offset = (i16) chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = (u16) (chip.Pc + offset);
chip.Bus.WriteWord(address, value);
}
private static u8 RegisterLoadByte(Chip chip)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
return (u8) (chip.GetRegister(regIndex) & 0xFF);
}
private static u16 RegisterLoadWord(Chip chip)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
return chip.GetRegister(regIndex);
}
private static void RegisterStoreByte(Chip chip, u8 value)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
u16 current = chip.GetRegister(regIndex);
u16 newValue = (u16)((current & 0xFF00) | value);
chip.SetRegister(regIndex, newValue);
}
private static void RegisterStoreWord(Chip chip, u16 value)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
chip.SetRegister(regIndex, value);
}
private static u8 RegisterIndirectLoadByte(Chip chip)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
u16 address = chip.GetRegister(regIndex);
return chip.Bus.Read(address);
}
private static u16 RegisterIndirectLoadWord(Chip chip)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
u16 address = chip.GetRegister(regIndex);
return chip.Bus.ReadWord(address);
}
private static void RegisterIndirectStoreByte(Chip chip, u8 value)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
u16 address = chip.GetRegister(regIndex);
chip.Bus.Write(address, value);
}
private static void RegisterIndirectStoreWord(Chip chip, u16 value)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
u16 address = chip.GetRegister(regIndex);
chip.Bus.WriteWord(address, value);
}
private static u8 RegisterIndirectOffsetLoadByte(Chip chip)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
i16 offset = (i16) chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = (u16)(chip.GetRegister(regIndex) + offset);
return chip.Bus.Read(address);
}
private static u16 RegisterIndirectOffsetLoadWord(Chip chip)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
i16 offset = (i16) chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = (u16)(chip.GetRegister(regIndex) + offset);
return chip.Bus.ReadWord(address);
}
private static void RegisterIndirectOffsetStoreByte(Chip chip, u8 value)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
i16 offset = (i16) chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = (u16)(chip.GetRegister(regIndex) + offset);
chip.Bus.Write(address, value);
}
private static void RegisterIndirectOffsetStoreWord(Chip chip, u16 value)
{
u8 regIndex = chip.Bus.Read(chip.Pc);
chip.Pc += 1;
i16 offset = (i16) chip.Bus.ReadWord(chip.Pc);
chip.Pc += 2;
u16 address = (u16)(chip.GetRegister(regIndex) + offset);
chip.Bus.WriteWord(address, value);
}
}
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