123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
/*
|
|
* This file is part of the 65816 Emulator Library.
|
|
* Copyright (c) 2018 Francesco Rigoni.
|
|
*
|
|
* https://github.com/FrancescoRigoni/Lib65816
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, version 3.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "../Cpu65816.hpp"
|
|
|
|
#define LOG_TAG "Cpu::executeMisc"
|
|
|
|
/**
|
|
* This file contains implementations for all OpCodes that didn't fall into other categories.
|
|
*/
|
|
|
|
void Cpu65816::executeMisc(OpCode &opCode) {
|
|
switch (opCode.getCode()) {
|
|
case(0xEB): // XBA
|
|
{
|
|
uint8_t lowerA = Binary::lower8BitsOf(mA);
|
|
uint8_t higherA = Binary::higher8BitsOf(mA);
|
|
mA = higherA | (((uint16_t)(lowerA)) << 8);
|
|
mCpuStatus.updateSignAndZeroFlagFrom8BitValue(higherA);
|
|
addToProgramAddressAndCycles(1, 3);
|
|
break;
|
|
}
|
|
case(0xDB): // STP
|
|
{
|
|
reset();
|
|
addToProgramAddress(1);
|
|
addToCycles(3);
|
|
break;
|
|
|
|
}
|
|
case(0xCB): // WAI
|
|
{
|
|
setRDYPin(false);
|
|
|
|
addToProgramAddress(1);
|
|
addToCycles(3);
|
|
break;
|
|
}
|
|
case(0x42): // WDM
|
|
{
|
|
addToProgramAddress(2);
|
|
addToCycles(2);
|
|
break;
|
|
}
|
|
case(0xEA): // NOP
|
|
{
|
|
addToProgramAddress(1);
|
|
addToCycles(2);
|
|
break;
|
|
}
|
|
case(0x44): // MVP
|
|
{
|
|
Address addressOfOpCodeData = getAddressOfOpCodeData(opCode);
|
|
uint8_t destinationBank = mSystemBus.readByte(addressOfOpCodeData);
|
|
addressOfOpCodeData.incrementOffsetBy(1);
|
|
uint8_t sourceBank = mSystemBus.readByte(addressOfOpCodeData);
|
|
|
|
Address sourceAddress(sourceBank, mX);
|
|
Address destinationAddress(destinationBank, mY);
|
|
|
|
while(mA != 0xFFFF) {
|
|
uint8_t toTransfer = mSystemBus.readByte(sourceAddress);
|
|
mSystemBus.storeByte(destinationAddress, toTransfer);
|
|
|
|
sourceAddress.decrementOffsetBy(1);
|
|
destinationAddress.decrementOffsetBy(1);
|
|
mA--;
|
|
|
|
addToCycles(7);
|
|
}
|
|
mDB = destinationBank;
|
|
|
|
addToProgramAddress(3);
|
|
break;
|
|
}
|
|
case(0x54): // MVN
|
|
{
|
|
Address addressOfOpCodeData = getAddressOfOpCodeData(opCode);
|
|
uint8_t destinationBank = mSystemBus.readByte(addressOfOpCodeData);
|
|
addressOfOpCodeData.incrementOffsetBy(1);
|
|
uint8_t sourceBank = mSystemBus.readByte(addressOfOpCodeData);
|
|
|
|
Address sourceAddress(sourceBank, mX);
|
|
Address destinationAddress(destinationBank, mY);
|
|
|
|
while(mA != 0xFFFF) {
|
|
uint8_t toTransfer = mSystemBus.readByte(sourceAddress);
|
|
mSystemBus.storeByte(destinationAddress, toTransfer);
|
|
|
|
sourceAddress.incrementOffsetBy(1);
|
|
destinationAddress.incrementOffsetBy(1);
|
|
mA--;
|
|
|
|
addToCycles(7);
|
|
}
|
|
mDB = destinationBank;
|
|
|
|
addToProgramAddress(3);
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
LOG_UNEXPECTED_OPCODE(opCode);
|
|
}
|
|
}
|
|
}
|