private static bool PostEh(uint uInstr, H8Disassembler dasm)
{
var iReg = hi3.Read(uInstr);
dasm.ops.Add(MemoryOperand.Post(dasm.dataSize !, Registers.GpRegisters[iReg]));
return(true);
}
/// <summary>
/// 8-bit register encoded in 4 bits at bit position 8
/// </summary>
private static bool rb8(uint uInstr, H8Disassembler dasm)
{
var iReg = r8_4.Read(uInstr);
dasm.ops.Add(new RegisterOperand(Registers.Gp8Registers[iReg]));
return(true);
}
private static bool Bit(uint uInstr, H8Disassembler dasm)
{
var imm = bfImm.Read(uInstr);
dasm.ops.Add(ImmediateOperand.Byte((byte)imm));
return(true);
}
/// <summary>
/// Immediate 8-bit number encoded in low 8 bits.
/// </summary>
private static bool I8(uint uInstr, H8Disassembler dasm)
{
var imm = (byte)uInstr;
dasm.ops.Add(ImmediateOperand.Byte(imm));
return(true);
}
/// <summary>
/// 8-bit absolute memory access, stored in the low 8 bits of this instruction.
/// </summary>
private static bool aa8(uint uInstr, H8Disassembler dasm)
{
uint uAddr = uInstr & 0xFF;
dasm.ops.Add(MemoryOperand.Abs(dasm.dataSize !, uAddr, PrimitiveType.Byte));
return(true);
}
/// <summary>
/// Memory access with base register.
/// </summary>
private static bool Mind(uint uInstr, H8Disassembler dasm)
{
var iBaseReg = hi3.Read(uInstr);
dasm.ops.Add(MemoryOperand.BaseOffset(dasm.dataSize !, 0, PrimitiveType.Ptr16, Registers.GpRegisters[iBaseReg]));
return(true);
}
/// <summary>
/// Deferred 8-bit absolute memory access, stored in the low 8 bits of this instruction.
/// </summary>
private static bool Def_aa8(uint uInstr, H8Disassembler dasm)
{
uint uAddr = uInstr & 0xFF;
var mop = MemoryOperand.Abs(dasm.dataSize !, uAddr, PrimitiveType.Byte);
mop.Deferred = true;
dasm.ops.Add(mop);
return(true);
}
/// <summary>
/// Immediate 16-bit number encoded in next 16 bits.
/// </summary>
private static bool I16(uint _, H8Disassembler dasm)
{
if (!dasm.rdr.TryReadBeUInt16(out var imm))
{
return(false);
}
dasm.ops.Add(ImmediateOperand.Word16(imm));
return(true);
}
/// <summary>
/// 16-bit absolute memory access, stored in the next 16 bits.
/// </summary>
private static bool aa16(uint uInstr, H8Disassembler dasm)
{
if (!dasm.rdr.TryReadUInt16(out ushort uAddr))
{
return(false);
}
dasm.ops.Add(MemoryOperand.Abs(dasm.dataSize !, uAddr, PrimitiveType.Ptr16));
return(true);
}
/// <summary>
/// Memory access with base register and 16-bit displacement; displacement follows opcode.
/// </summary>
private static bool Md16(uint uInstr, H8Disassembler dasm)
{
if (!dasm.rdr.TryReadBeInt16(out short offset))
{
return(false);
}
var iBaseReg = hi3.Read(uInstr);
dasm.ops.Add(MemoryOperand.BaseOffset(dasm.dataSize !, offset, PrimitiveType.Ptr16, Registers.GpRegisters[iBaseReg]));
return(true);
}
/// <summary>
/// 16-bit register encoded in 4 bits at bit position 8
/// </summary>
private static bool r8(uint uInstr, H8Disassembler dasm)
{
var iReg = r8_4.Read(uInstr);
if (iReg >= dasm.regs.Length)
{
return(false);
}
dasm.ops.Add(new RegisterOperand(dasm.regs[iReg]));
return(true);
}
/// <summary>
/// 32-bit register encoded in low 4 bits.
/// </summary>
private static bool rgpl(uint uInstr, H8Disassembler dasm)
{
var iReg = r0_4.Read(uInstr);
if ((iReg & 8) != 0)
{
return(false);
}
dasm.ops.Add(new RegisterOperand(Registers.GpRegisters[iReg]));
return(true);
}
/// <summary>
/// 24-bit absolute memory access, stored in the low 8 bits of the instruction
/// and the next 16 bits.
/// </summary>
private static bool aa24_16(uint uInstr, H8Disassembler dasm)
{
if (!dasm.rdr.TryReadUInt16(out ushort uLow16))
{
return(false);
}
uint uAddr = ((uInstr & 0xFF) << 16) | uLow16;
dasm.ops.Add(MemoryOperand.Abs(dasm.dataSize !, uAddr, dasm.arch.Ptr24));
return(true);
}
/// <summary>
/// 8 bit signed displacement from the low byte of the instruction.
/// </summary>
private static bool disp8(uint uInstr, H8Disassembler dasm)
{
var disp = (sbyte)uInstr;
if ((disp & 1) != 0)
{
return(false); // Branch destination must be even.
}
var addrTarget = dasm.rdr.Address + disp;
dasm.ops.Add(AddressOperand.Create(addrTarget));
return(true);
}
/// <summary>
/// 24-bit absolute memory access, stored in the next 24 bits.
/// </summary>
private static bool aa24(uint uInstr, H8Disassembler dasm)
{
if (!dasm.rdr.TryReadUInt16(out ushort uHigh16))
{
return(false);
}
if (!dasm.rdr.TryReadByte(out byte uLow8))
{
return(false);
}
uint uAddr = (uint)uHigh16 << 8;
uAddr |= uLow8;
dasm.ops.Add(MemoryOperand.Abs(dasm.dataSize !, uAddr, dasm.arch.Ptr24));
return(true);
}
private static bool b(uint _, H8Disassembler dasm)
{
dasm.dataSize = PrimitiveType.Byte;
dasm.regs = Registers.Gp8Registers;
return(true);
}
private static bool ccr(uint _, H8Disassembler dasm)
{
dasm.ops.Add(new RegisterOperand(Registers.CcRegister));
return(true);
}
private static bool l(uint _, H8Disassembler dasm)
{
dasm.dataSize = PrimitiveType.Word32;
dasm.regs = Registers.GpRegisters;
return(true);
}