private uint createXtdType(XtdOpCode xtdOpCode, Register reg1, Register reg2, Register reg3)
{
uint res = 0u;
res = (uint)OpCode.Xtd << 26
| (uint)reg1 << 21
| (uint)reg2 << 16
| (uint)reg3 << 11
| (uint)xtdOpCode;
return(res);
}
public bool Step()
{
_IR = (uint)_ram[_PC];
_PC++;
if (_keyboardController != null)
{
_ram[GAME_PAD] = (int)_keyboardController();
}
var ticks = (ulong)_ram[TICKS_LOW] + ((ulong)_ram[TICKS_HIGH] << 32);
var opcode = (OpCode)CodeBuilder.ExtractOpCode(_IR);
var ra = CodeBuilder.ExtractRegA(_IR);
var rb = CodeBuilder.ExtractRegB(_IR);
var rc = CodeBuilder.ExtractRegC(_IR);
var offset = CodeBuilder.ExtractOffset(_IR);
var address = CodeBuilder.ExtractAddress(_IR);
switch (opcode)
{
case OpCode.Ld:
_regs[ra] = _ram[address];
break;
case OpCode.Ldr:
_regs[ra] = _ram[(uint)(_regs[rb] + offset)];
break;
case OpCode.St:
_ram[address] = _regs[ra];
break;
case OpCode.Rnd:
_regs[ra] = _rnd.Next(0, int.MaxValue);
break;
case OpCode.Str:
_ram[(uint)(_regs[rb] + offset)] = _regs[ra];
break;
case OpCode.Jmp:
_PC = address;
break;
case OpCode.Jmpr:
_PC = (uint)_regs[ra];
break;
case OpCode.Jal:
_regs[ra] = (int)_PC;
_PC = address;
break;
case OpCode.Brz:
if (_regs[ra] == 0)
{
_PC = address;
}
break;
case OpCode.Brnz:
if (_regs[ra] != 0)
{
_PC = address;
}
break;
case OpCode.Brgz:
if (_regs[ra] > 0)
{
_PC = address;
}
break;
case OpCode.Brgez:
if (_regs[ra] >= 0)
{
_PC = address;
}
break;
case OpCode.Brlz:
if (_regs[ra] < 0)
{
_PC = address;
}
break;
case OpCode.Brlez:
if (_regs[ra] <= 0)
{
_PC = address;
}
break;
case OpCode.Beq:
if (_regs[ra] == _regs[rb])
{
_PC = (uint)(_PC + offset);
}
break;
case OpCode.Bneq:
if (_regs[ra] != _regs[rb])
{
_PC = (uint)(_PC + offset);
}
break;
case OpCode.Bge:
if (_regs[ra] >= _regs[rb])
{
_PC = (uint)(_PC + offset);
}
break;
case OpCode.Ble:
if (_regs[ra] <= _regs[rb])
{
_PC = (uint)(_PC + offset);
}
break;
case OpCode.Bgt:
if (_regs[ra] > _regs[rb])
{
_PC = (uint)(_PC + offset);
}
break;
case OpCode.Blt:
if (_regs[ra] < _regs[rb])
{
_PC = (uint)(_PC + offset);
}
break;
case OpCode.Subi:
_regs[ra] = _regs[rb] - offset;
break;
case OpCode.Addi:
_regs[ra] = _regs[rb] + offset;
break;
case OpCode.Movli:
_regs[ra] = (ushort)offset;
break;
case OpCode.Movhi:
_regs[ra] = (ushort)offset << 16;
break;
case OpCode.Shli:
_regs[ra] = _regs[rb] << (ushort)offset;
break;
case OpCode.Shri:
_regs[ra] = (int)((uint)_regs[rb] >> (ushort)offset);
break;
case OpCode.Muli:
_regs[ra] = _regs[rb] * offset;
break;
case OpCode.Divi:
_regs[ra] = _regs[rb] / offset;
break;
case OpCode.Modi:
_regs[ra] = _regs[rb] % offset;
break;
case OpCode.Andi:
_regs[ra] = _regs[rb] & (ushort)offset;
break;
case OpCode.Ori:
_regs[ra] = _regs[rb] | (ushort)offset;
break;
case OpCode.Xori:
_regs[ra] = _regs[rb] ^ (ushort)offset;
break;
case OpCode.Nop:
break;
case OpCode.Hlt:
_PC--;
return(false);
case OpCode.Brk:
var breakHere = 0xC;
break;
case OpCode.Xtd:
XtdOpCode fun = CodeBuilder.ExtractXtdOpCode(_IR);
switch (fun)
{
case XtdOpCode.Sub:
_regs[ra] = _regs[rb] - _regs[rc];
break;
case XtdOpCode.Add:
_regs[ra] = _regs[rb] + _regs[rc];
break;
case XtdOpCode.Shl:
_regs[ra] = _regs[rb] << _regs[rc];
break;
case XtdOpCode.Shr:
_regs[ra] = (int)((uint)_regs[rb] >> _regs[rc]);
break;
case XtdOpCode.Mul:
_regs[ra] = _regs[rb] * _regs[rc];
break;
case XtdOpCode.Div:
_regs[ra] = _regs[rb] / _regs[rc];
break;
case XtdOpCode.Mod:
_regs[ra] = _regs[rb] % _regs[rc];
break;
case XtdOpCode.And:
_regs[ra] = _regs[rb] & _regs[rc];
break;
case XtdOpCode.Or:
_regs[ra] = _regs[rb] | _regs[rc];
break;
case XtdOpCode.Xor:
_regs[ra] = _regs[rb] ^ _regs[rc];
break;
case XtdOpCode.Not:
_regs[ra] = ~_regs[rb];
break;
case XtdOpCode.Neg:
_regs[ra] = -_regs[rb];
break;
case XtdOpCode.Ldrx:
_regs[ra] = _ram[(uint)(_regs[rb] + _regs[rc])];
break;
case XtdOpCode.Strx:
_ram[(uint)(_regs[rb] + _regs[rc])] = _regs[ra];
break;
}
break;
}
ticks++;
_ram[TICKS_LOW] = (int)(0x00000000FFFFFFFF & ticks);
_ram[TICKS_HIGH] = (int)((0xFFFFFFFF00000000 & ticks) >> 32);
return(true);
}