112 lines
3.6 KiB
C++
112 lines
3.6 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 "../Cpu65816.hpp"
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#define LOG_TAG "Cpu::executeJumpReturn"
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/**
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* This file contains the implementation for all OpCodes
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* that deal with jumps, calls and returns.
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*/
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void Cpu65816::executeJumpReturn(OpCode &opCode) {
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switch (opCode.getCode()) {
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case(0x20): // JSR Absolute
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{
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mStack.push16Bit(mProgramAddress.getOffset() + 2);
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uint16_t destinationAddress = getAddressOfOpCodeData(opCode).getOffset();
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setProgramAddress(Address(mProgramAddress.getBank(), destinationAddress));
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addToCycles(6);
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break;
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}
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case(0x22): // JSR Absolute Long
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{
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mStack.push8Bit(mProgramAddress.getBank());
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mStack.push16Bit(mProgramAddress.getOffset() + 3);
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setProgramAddress(getAddressOfOpCodeData(opCode));
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addToCycles(8);
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break;
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}
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case(0xFC): // JSR Absolute Indexed Indirect, X
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{
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Address destinationAddress = getAddressOfOpCodeData(opCode);
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mStack.push8Bit(mProgramAddress.getBank());
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mStack.push16Bit(mProgramAddress.getOffset() + 2);
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setProgramAddress(destinationAddress);
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addToCycles(8);
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break;
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}
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case(0x4C): // JMP Absolute
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{
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uint16_t destinationAddress = getAddressOfOpCodeData(opCode).getOffset();
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setProgramAddress(Address(mProgramAddress.getBank(), destinationAddress));
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addToCycles(3);
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break;
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}
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case(0x6C): // JMP Absolute Indirect
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{
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setProgramAddress(getAddressOfOpCodeData(opCode));
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addToCycles(5);
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#ifdef EMU_65C02
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addToCycles(1);
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#endif
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break;
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}
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case(0x7C): // JMP Absolute Indexed Indirect, X
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{
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setProgramAddress(getAddressOfOpCodeData(opCode));
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addToCycles(6);
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break;
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}
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case(0x5C): // JMP Absolute Long
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{
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setProgramAddress(getAddressOfOpCodeData(opCode));
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addToCycles(4);
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break;
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}
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case(0xDC): // JMP Absolute Indirect Long
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{
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setProgramAddress(getAddressOfOpCodeData(opCode));
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addToCycles(6);
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break;
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}
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case(0x6B): // RTL
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{
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uint16_t newOffset = mStack.pull16Bit() + 1;
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uint8_t newBank = mStack.pull8Bit();
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Address returnAddress(newBank, newOffset);
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setProgramAddress(returnAddress);
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addToCycles(6);
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break;
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}
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case(0x60): // RTS
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{
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Address returnAddress(mProgramAddress.getBank(), mStack.pull16Bit() + 1);
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setProgramAddress(returnAddress);
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addToCycles(6);
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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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