99 lines
3.8 KiB
C++
99 lines
3.8 KiB
C++
/*
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* This file is part of the 65816 Emulator Library.
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* Copyright (c) 2018 Francesco Rigoni.
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*
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* https://github.com/FrancescoRigoni/Lib65816
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Interrupt.hpp"
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#include "Cpu65816.hpp"
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#define LOG_TAG "Cpu::executeInterrupt"
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/**
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* This file contains the implementation for all OpCodes
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* that deal with interrupts.
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*/
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void Cpu65816::executeInterrupt(OpCode &opCode) {
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switch (opCode.getCode()) {
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case(0x00): // BRK
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{
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if (mCpuStatus.emulationFlag()) {
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mStack.push16Bit(static_cast<uint16_t>(mProgramAddress.getOffset() + 2));
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mCpuStatus.setBreakFlag();
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mStack.push8Bit(mCpuStatus.getRegisterValue());
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mCpuStatus.setInterruptDisableFlag();
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#ifdef EMU_65C02
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mCpuStatus.clearDecimalFlag();
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#endif
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setProgramAddress(Address(0x00, mEmulationInterrupts->brkIrq));
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addToCycles(7);
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} else {
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mStack.push8Bit(mProgramAddress.getBank());
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mStack.push16Bit(static_cast<uint16_t>(mProgramAddress.getOffset() + 2));
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mStack.push8Bit(mCpuStatus.getRegisterValue());
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mCpuStatus.setInterruptDisableFlag();
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mCpuStatus.clearDecimalFlag();
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Address newAddress(0x00, mNativeInterrupts->brk);
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setProgramAddress(newAddress);
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addToCycles(8);
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}
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break;
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}
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case(0x02): // COP
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{
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if (mCpuStatus.emulationFlag()) {
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mStack.push16Bit(static_cast<uint16_t>(mProgramAddress.getOffset() + 2));
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mStack.push8Bit(mCpuStatus.getRegisterValue());
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mCpuStatus.setInterruptDisableFlag();
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setProgramAddress(Address(0x00, mEmulationInterrupts->coProcessorEnable));
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addToCycles(7);
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} else {
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mStack.push8Bit(mProgramAddress.getBank());
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mStack.push16Bit(static_cast<uint16_t>(mProgramAddress.getOffset() + 2));
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mStack.push8Bit(mCpuStatus.getRegisterValue());
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mCpuStatus.setInterruptDisableFlag();
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setProgramAddress(Address(0x00, mNativeInterrupts->coProcessorEnable));
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addToCycles(8);
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}
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mCpuStatus.clearDecimalFlag();
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break;
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}
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case(0x40): // RTI
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{
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// Note: The picture in the 65816 programming manual about this looks wrong.
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// This implementation follows the text instead.
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mCpuStatus.setRegisterValue(mStack.pull8Bit());
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if (mCpuStatus.emulationFlag()) {
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Address newProgramAddress(mProgramAddress.getBank(), mStack.pull16Bit());
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mProgramAddress = newProgramAddress;
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addToCycles(6);
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} else {
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uint16_t offset = mStack.pull16Bit();
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uint8_t bank = mStack.pull8Bit();
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Address newProgramAddress(bank, offset);
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mProgramAddress = newProgramAddress;
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addToCycles(7);
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}
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break;
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}
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default: {
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LOG_UNEXPECTED_OPCODE(opCode);
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}
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}
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}
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