61 lines
1.9 KiB
C++
61 lines
1.9 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 "Stack.hpp"
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#include "Log.hpp"
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#define LOG_TAG "Stack"
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Stack::Stack(SystemBus *systemBus) :
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mSystemBus(systemBus),
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mStackAddress(0x00, STACK_POINTER_DEFAULT) {
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Log::trc(LOG_TAG).str("Initialized at default location ").sp().hex(mStackAddress.getOffset(), 4).show();
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}
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Stack::Stack(SystemBus *systemBus, uint16_t stackPointer) :
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mSystemBus(systemBus),
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mStackAddress(0x00, stackPointer) {
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Log::trc(LOG_TAG).str("Initialized at location ").sp().hex(mStackAddress.getOffset(), 4).show();
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}
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void Stack::push8Bit(uint8_t value) {
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mSystemBus->storeByte(mStackAddress, value);
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mStackAddress.decrementOffsetBy(sizeof(uint8_t));
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}
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void Stack::push16Bit(uint16_t value) {
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auto leastSignificant = (uint8_t)((value) & 0xFF);
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auto mostSignificant = (uint8_t)(((value) & 0xFF00) >> 8);
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push8Bit(mostSignificant);
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push8Bit(leastSignificant);
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}
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uint8_t Stack::pull8Bit() {
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mStackAddress.incrementOffsetBy(sizeof(uint8_t));
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return mSystemBus->readByte(mStackAddress);
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}
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uint16_t Stack::pull16Bit() {
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return (uint16_t)(pull8Bit() | (((uint16_t)pull8Bit()) << 8));
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}
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uint16_t Stack::getStackPointer() {
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return mStackAddress.getOffset();
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}
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