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.idea/
65816.cbp
CMakeCache.txt
CMakeFiles/
Makefile
cmake_install.cmake
lib65816.a
simple-logger/
.DS_Store

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cmake_minimum_required (VERSION 2.6)
project (65816)
include(ExternalProject)
ExternalProject_Add(
simple-logger
PREFIX "${PROJECT_SOURCE_DIR}/simple-logger"
GIT_REPOSITORY https://github.com/FrancescoRigoni/Simple-Logger.git
INSTALL_COMMAND "")
# Retrieve simple-logger sources location
ExternalProject_Get_Property(simple-logger source_dir)
set(SIMPLE_LOGGER_SRC ${source_dir})
# Retrieve simple-logger binaries location
ExternalProject_Get_Property(simple-logger binary_dir)
set(SIMPLE_LOGGER_BIN ${binary_dir})
# Add all include directories
include_directories(src/** ${SIMPLE_LOGGER_SRC})
# Add paths for linker
link_directories(${SIMPLE_LOGGER_BIN})
if (CMAKE_VERSION VERSION_LESS "3.1")
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set (CMAKE_CXX_FLAGS "--std=gnu++14 ${CMAKE_CXX_FLAGS}")
endif ()
else ()
set (CMAKE_CXX_STANDARD 14)
endif ()
# All warnings on
set (CMAKE_CXX_FLAGS "-Wall ${CMAKE_CXX_FLAGS}")
file(GLOB sources_65816 src/*.cpp src/opcodes/*.cpp)
add_library(65816 ${sources_65816})
add_dependencies(65816 simple-logger)
target_link_libraries(65816 simpleLogger)

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# Lib65816
Emulator library for the 65816 CPU

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GNU GENERAL PUBLIC LICENSE
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possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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, either version 3 of the License, or
(at your option) any later version.
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/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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/*
* 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 "Addressing"
bool Cpu65816::opCodeAddressingCrossesPageBoundary(OpCode &opCode) {
switch(opCode.getAddressingMode()) {
case AddressingMode::AbsoluteIndexedWithX:
{
Address initialAddress(mDB, mSystemBus.readTwoBytes(mProgramAddress.newWithOffset(1)));
// TODO: figure out when to wrap around and when not to, it should not matter in this case
// but it matters when fetching data
Address finalAddress = Address::sumOffsetToAddress(initialAddress, indexWithXRegister());
return Address::offsetsAreOnDifferentPages(initialAddress.getOffset(), finalAddress.getOffset());
}
case AddressingMode::AbsoluteIndexedWithY:
{
Address initialAddress(mDB, mSystemBus.readTwoBytes(mProgramAddress.newWithOffset(1)));
// TODO: figure out when to wrap around and when not to, it should not matter in this case
// but it matters when fetching data
Address finalAddress = Address::sumOffsetToAddress(initialAddress, indexWithYRegister());
return Address::offsetsAreOnDifferentPages(initialAddress.getOffset(), finalAddress.getOffset());
}
case AddressingMode::DirectPageIndirectIndexedWithY:
{
uint16_t firstStageOffset = mD + mSystemBus.readByte(mProgramAddress.newWithOffset(1));
Address firstStageAddress(0x00, firstStageOffset);
uint16_t secondStageOffset = mSystemBus.readTwoBytes(firstStageAddress);
Address thirdStageAddress(mDB, secondStageOffset);
// TODO: figure out when to wrap around and when not to, it should not matter in this case
// but it matters when fetching data
Address finalAddress = Address::sumOffsetToAddress(thirdStageAddress, indexWithYRegister());
return Address::offsetsAreOnDifferentPages(thirdStageAddress.getOffset(), finalAddress.getOffset());
}
default:
{
Log::err(LOG_TAG).str("!!! Unsupported opCodeAddressingCrossesPageBoundary for opCode: ").hex(opCode.getCode(), 2).show();
}
}
return false;
}
Address Cpu65816::getAddressOfOpCodeData(OpCode &opCode) {
uint8_t dataAddressBank;
uint16_t dataAddressOffset;
switch(opCode.getAddressingMode()) {
case AddressingMode::Interrupt:
case AddressingMode::Accumulator:
case AddressingMode::Implied:
case AddressingMode::StackImplied:
// Not really used, doesn't make any sense since these opcodes do not have operands
return mProgramAddress;
case AddressingMode::Immediate:
case AddressingMode::BlockMove:
// Blockmove OpCodes have two bytes following them directly
case AddressingMode::StackAbsolute:
// Stack absolute is used to push values following the op code onto the stack
case AddressingMode::ProgramCounterRelative:
// Program counter relative OpCodes such as all branch instructions have an 8 bit operand
// following the op code
case AddressingMode::ProgramCounterRelativeLong:
// StackProgramCounterRelativeLong is only used by the PER OpCode, it has 16 bit operand
case AddressingMode::StackProgramCounterRelativeLong:
mProgramAddress.newWithOffset(1).getBankAndOffset(&dataAddressBank, &dataAddressOffset);
break;
case AddressingMode::Absolute:
dataAddressBank = mDB;
dataAddressOffset = mSystemBus.readTwoBytes(mProgramAddress.newWithOffset(1));
break;
case AddressingMode::AbsoluteLong:
mSystemBus.readAddressAt(mProgramAddress.newWithOffset(1)).getBankAndOffset(&dataAddressBank, &dataAddressOffset);
break;
case AddressingMode::AbsoluteIndirect:
{
dataAddressBank = mProgramAddress.getBank();
Address addressOfOffset(0x00, mSystemBus.readTwoBytes(mProgramAddress.newWithOffset(1)));
dataAddressOffset = mSystemBus.readTwoBytes(addressOfOffset);
}
break;
case AddressingMode::AbsoluteIndirectLong:
{
Address addressOfEffectiveAddress(0x00, mSystemBus.readTwoBytes(mProgramAddress.newWithOffset(1)));
mSystemBus.readAddressAt(addressOfEffectiveAddress).getBankAndOffset(&dataAddressBank, &dataAddressOffset);
}
break;
case AddressingMode::AbsoluteIndexedIndirectWithX:
{
Address firstStageAddress(mProgramAddress.getBank(), mSystemBus.readTwoBytes(mProgramAddress.newWithOffset(1)));
Address secondStageAddress = firstStageAddress.newWithOffsetNoWrapAround(indexWithXRegister());
dataAddressBank = mProgramAddress.getBank();
dataAddressOffset = mSystemBus.readTwoBytes(secondStageAddress);
}
break;
case AddressingMode::AbsoluteIndexedWithX:
{
Address firstStageAddress(mDB, mSystemBus.readTwoBytes(mProgramAddress.newWithOffset(1)));
Address::sumOffsetToAddressNoWrapAround(firstStageAddress, indexWithXRegister())
.getBankAndOffset(&dataAddressBank, &dataAddressOffset);;
}
break;
case AddressingMode::AbsoluteLongIndexedWithX:
{
Address firstStageAddress = mSystemBus.readAddressAt(mProgramAddress.newWithOffset(1));
Address::sumOffsetToAddressNoWrapAround(firstStageAddress, indexWithXRegister())
.getBankAndOffset(&dataAddressBank, &dataAddressOffset);;
}
break;
case AddressingMode::AbsoluteIndexedWithY:
{
Address firstStageAddress(mDB, mSystemBus.readTwoBytes(mProgramAddress.newWithOffset(1)));
Address::sumOffsetToAddressNoWrapAround(firstStageAddress, indexWithYRegister())
.getBankAndOffset(&dataAddressBank, &dataAddressOffset);;
}
break;
case AddressingMode::DirectPage:
{
// Direct page/Zero page always refers to bank zero
dataAddressBank = 0x00;
if (mCpuStatus.emulationFlag()) {
// 6502 uses zero page
dataAddressOffset = mSystemBus.readByte(mProgramAddress.newWithOffset(1));
} else {
// 65816 uses direct page
dataAddressOffset = mD + mSystemBus.readByte(mProgramAddress.newWithOffset(1));
}
}
break;
case AddressingMode::DirectPageIndexedWithX:
{
dataAddressBank = 0x00;
dataAddressOffset = mD + indexWithXRegister() + mSystemBus.readByte(mProgramAddress.newWithOffset(1));
}
break;
case AddressingMode::DirectPageIndexedWithY:
{
dataAddressBank = 0x00;
dataAddressOffset = mD + indexWithYRegister() + mSystemBus.readByte(mProgramAddress.newWithOffset(1));
}
break;
case AddressingMode::DirectPageIndirect:
{
Address firstStageAddress(0x00, mD + mSystemBus.readByte(mProgramAddress.newWithOffset(1)));
dataAddressBank = mDB;
dataAddressOffset = mSystemBus.readTwoBytes(firstStageAddress);
}
break;
case AddressingMode::DirectPageIndirectLong:
{
Address firstStageAddress(0x00, mD + mSystemBus.readByte(mProgramAddress.newWithOffset(1)));
mSystemBus.readAddressAt(firstStageAddress)
.getBankAndOffset(&dataAddressBank, &dataAddressOffset);;
}
break;
case AddressingMode::DirectPageIndexedIndirectWithX:
{
Address firstStageAddress(0x00, mD + mSystemBus.readByte(mProgramAddress.newWithOffset(1)) + indexWithXRegister());
dataAddressBank = mDB;
dataAddressOffset = mSystemBus.readTwoBytes(firstStageAddress);
}
break;
case AddressingMode::DirectPageIndirectIndexedWithY:
{
Address firstStageAddress(0x00, mD + mSystemBus.readByte(mProgramAddress.newWithOffset(1)));
uint16_t secondStageOffset = mSystemBus.readTwoBytes(firstStageAddress);
Address thirdStageAddress(mDB, secondStageOffset);
Address::sumOffsetToAddressNoWrapAround(thirdStageAddress, indexWithYRegister())
.getBankAndOffset(&dataAddressBank, &dataAddressOffset);
}
break;
case AddressingMode::DirectPageIndirectLongIndexedWithY:
{
Address firstStageAddress(0x00, mD + mSystemBus.readByte(mProgramAddress.newWithOffset(1)));
Address secondStageAddress = mSystemBus.readAddressAt(firstStageAddress);
Address::sumOffsetToAddressNoWrapAround(secondStageAddress, indexWithYRegister())
.getBankAndOffset(&dataAddressBank, &dataAddressOffset);
}
break;
case AddressingMode::StackRelative:
{
dataAddressBank = 0x00;
dataAddressOffset = mStack.getStackPointer() + mSystemBus.readByte(mProgramAddress.newWithOffset(1));
}
break;
case AddressingMode::StackDirectPageIndirect:
{
dataAddressBank = 0x00;
dataAddressOffset = mD + mSystemBus.readByte(mProgramAddress.newWithOffset(1));
}
break;
case AddressingMode::StackRelativeIndirectIndexedWithY:
{
Address firstStageAddress(0x00, mStack.getStackPointer() + mSystemBus.readByte(mProgramAddress.newWithOffset(1)));
uint16_t secondStageOffset = mSystemBus.readTwoBytes(firstStageAddress);
Address thirdStageAddress(mDB, secondStageOffset);
Address::sumOffsetToAddressNoWrapAround(thirdStageAddress, indexWithYRegister())
.getBankAndOffset(&dataAddressBank, &dataAddressOffset);
}
break;
}
return Address(dataAddressBank, dataAddressOffset);
}

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/*
* 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/>.
*/
#ifndef ADDRESSING_HPP
#define ADDRESSING_HPP
enum class AddressingMode {
Interrupt,
Accumulator,
BlockMove,
Implied,
Immediate,
Absolute,
AbsoluteLong,
AbsoluteIndirect,
AbsoluteIndirectLong,
AbsoluteIndexedIndirectWithX, // index with X
AbsoluteIndexedWithX,
AbsoluteLongIndexedWithX,
AbsoluteIndexedWithY,
DirectPage,
DirectPageIndexedWithX,
DirectPageIndexedWithY,
DirectPageIndirect,
DirectPageIndirectLong,
DirectPageIndexedIndirectWithX,
DirectPageIndirectIndexedWithY,
DirectPageIndirectLongIndexedWithY,
StackImplied,
StackRelative,
StackAbsolute,
StackDirectPageIndirect,
StackProgramCounterRelativeLong,
StackRelativeIndirectIndexedWithY,
ProgramCounterRelative,
ProgramCounterRelativeLong
};
#endif // ADDRESSING_HPP

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/*
* 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 "Binary.hpp"
namespace Binary {
uint8_t lower8BitsOf(uint16_t value) {
return ((uint8_t)(value & 0xFF));
}
uint8_t higher8BitsOf(uint16_t value) {
return ((uint8_t)((value & 0xFF00) >> 8));
}
uint16_t lower16BitsOf(uint32_t value) {
return ((uint16_t)(value & 0xFFFF));
}
bool is8bitValueNegative(uint8_t value) {
return (value & 0x80);
}
bool is16bitValueNegative(uint16_t value) {
return (value & 0x8000);
}
bool is8bitValueZero(uint8_t value) {
return (value == 0x00);
}
bool is16bitValueZero(uint16_t value) {
return (value == 0x0000);
}
void setLower8BitsOf16BitsValue(uint16_t *destination, uint8_t value) {
*destination &= 0xFF00;
*destination |= value;
}
void setBitIn8BitValue(uint8_t *value, uint8_t bitNumber) {
auto mask = static_cast<uint8_t>(1 << bitNumber);
*value = *value | mask;
}
void clearBitIn8BitValue(uint8_t *value, uint8_t bitNumber) {
auto mask = static_cast<uint8_t>(1 << bitNumber);
mask = static_cast<uint8_t>(mask ^ 0xFF);
*value = *value & mask;
}
void setBitIn16BitValue(uint16_t *value, uint8_t bitNumber) {
auto mask = static_cast<uint16_t>(1 << bitNumber);
*value = *value | mask;
}
void clearBitIn16BitValue(uint16_t *value, uint8_t bitNumber) {
auto mask = static_cast<uint16_t>(1 << bitNumber);
mask = static_cast<uint16_t>(mask ^ 0xFFFF);
*value = *value & mask;
}
uint8_t convert8BitToBcd(uint8_t val)
{
uint8_t value = val;
uint8_t result = 0;
uint8_t shiftLeft = 0;
while (value > 0) {
auto digit = static_cast<uint8_t>(value % 10);
result |= digit << shiftLeft;
value /= 10;
shiftLeft += 4;
}
return result;
}
uint16_t convert16BitToBcd(uint16_t val)
{
uint16_t value = val;
uint16_t result = 0;
uint16_t shiftLeft = 0;
while (value > 0) {
auto digit = static_cast<uint8_t>(value % 10);
result |= digit << shiftLeft;
value /= 10;
shiftLeft += 4;
}
return result;
}
bool bcdSum8Bit(uint8_t bcdFirst, uint8_t bcdSecond, uint8_t *result, bool carry) {
uint8_t shift = 0;
*result = 0;
while (shift < 8) {
auto digitOfFirst = static_cast<uint8_t>(bcdFirst & 0xF);
auto digitOfSecond = static_cast<uint8_t>(bcdSecond & 0xF);
auto sumOfDigits = static_cast<uint8_t>(digitOfFirst + digitOfSecond + (carry ? 1 : 0));
carry = sumOfDigits > 9;
if (carry) sumOfDigits += 6;
sumOfDigits &= 0xF;
*result |= sumOfDigits << shift;
shift += 4;
bcdFirst >>= shift;
bcdSecond >>= shift;
}
return carry;
}
bool bcdSubtract8Bit(uint8_t bcdFirst, uint8_t bcdSecond, uint8_t *result, bool borrow) {
uint8_t shift = 0;
*result = 0;
while (shift < 8) {
auto digitOfFirst = static_cast<uint8_t>(bcdFirst & 0xF);
auto digitOfSecond = static_cast<uint8_t>(bcdSecond & 0xF);
auto diffOfDigits = static_cast<uint8_t>(digitOfFirst - digitOfSecond - (borrow ? 1 : 0));
borrow = diffOfDigits > 9;
if (borrow) diffOfDigits -= 6;
diffOfDigits &= 0xF;
*result |= diffOfDigits << shift;
shift += 4;
bcdFirst >>= shift;
bcdSecond >>= shift;
}
return borrow;
}
bool bcdSum16Bit(uint16_t bcdFirst, uint16_t bcdSecond, uint16_t *result, bool carry) {
*result = 0;
uint8_t shift = 0;
while (shift < 16) {
auto digitOfFirst = static_cast<uint8_t>(bcdFirst & 0xFF);
auto digitOfSecond = static_cast<uint8_t>(bcdSecond & 0xFF);
uint8_t partialresult = 0;
carry = bcdSum8Bit(digitOfFirst, digitOfSecond, &partialresult, carry);
*result |= partialresult << shift;
shift += 8;
bcdFirst >>= shift;
bcdSecond >>= shift;
}
return carry;
}
bool bcdSubtract16Bit(uint16_t bcdFirst, uint16_t bcdSecond, uint16_t *result, bool borrow) {
*result = 0;
uint8_t shift = 0;
while (shift < 16) {
auto digitOfFirst = static_cast<uint8_t>(bcdFirst & 0xFF);
auto digitOfSecond = static_cast<uint8_t>(bcdSecond & 0xFF);
uint8_t partialresult = 0;
borrow = bcdSubtract8Bit(digitOfFirst, digitOfSecond, &partialresult, borrow);
*result |= partialresult << shift;
shift += 8;
bcdFirst >>= shift;
bcdSecond >>= shift;
}
return borrow;
}
}

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/*
* 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 <stdint.h>
#ifndef __UTILS__
#define __UTILS__
namespace Binary {
uint8_t lower8BitsOf(uint16_t);
uint8_t higher8BitsOf(uint16_t);
uint16_t lower16BitsOf(uint32_t);
bool is8bitValueNegative(uint8_t);
bool is16bitValueNegative(uint16_t);
bool is8bitValueZero(uint8_t);
bool is16bitValueZero(uint16_t);
void setLower8BitsOf16BitsValue(uint16_t *, uint8_t);
void setBitIn8BitValue(uint8_t *, uint8_t);
void clearBitIn8BitValue(uint8_t *, uint8_t);
void setBitIn16BitValue(uint16_t *, uint8_t);
void clearBitIn16BitValue(uint16_t *, uint8_t);
uint8_t convert8BitToBcd(uint8_t);
uint16_t convert16BitToBcd(uint16_t);
bool bcdSum8Bit(uint8_t, uint8_t, uint8_t *, bool);
bool bcdSum16Bit(uint16_t, uint16_t, uint16_t *, bool);
bool bcdSubtract8Bit(uint8_t, uint8_t, uint8_t *, bool);
bool bcdSubtract16Bit(uint16_t, uint16_t, uint16_t *, bool);
}
#endif

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/*
* 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/>.
*/
/**
* The following define enables building the Cpu65816 for 65C02 emulation.
* Note that this will enable 65C02 emulation but NOT R65C02 emulation.
* The R65C02 cpu has several different opcodes and is not compatible
* with the 65C02.
*
* This define enables some minor differences in cycles counting
* for some opcodes.
* */
//#define EMU_65C02

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/*
* 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"
#include <cmath>
#ifdef EMU_65C02
#define LOG_TAG "Cpu65C02"
#else
#define LOG_TAG (mCpuStatus.emulationFlag() ? "Cpu6502" : "Cpu65816")
#endif
Cpu65816::Cpu65816(SystemBus &systemBus, EmulationModeInterrupts *emulationInterrupts, NativeModeInterrupts *nativeInterrupts) :
mSystemBus(systemBus),
mEmulationInterrupts(emulationInterrupts),
mNativeInterrupts(nativeInterrupts),
mStack(&mSystemBus) {
}
/**
* Resets the cpu to its initial state.
* */
void Cpu65816::reset() {
setRESPin(true);
mCpuStatus.setEmulationFlag();
mCpuStatus.setAccumulatorWidthFlag();
mCpuStatus.setIndexWidthFlag();
mX &= 0xFF;
mY &= 0xFF;
mD = 0x0;
mStack = Stack(&mSystemBus);
mProgramAddress = Address(0x00, mEmulationInterrupts->reset);
}
void Cpu65816::setRESPin(bool value) {
if (value == false && mPins.RES == true) {
reset();
}
mPins.RES = value;
}
void Cpu65816::setRDYPin(bool value) {
mPins.RDY = value;
}
bool Cpu65816::executeNextInstruction() {
if (mPins.RES) {
return false;
}
// Fetch the instruction
const uint8_t instruction = mSystemBus.readByte(mProgramAddress);
OpCode opCode = OP_CODE_TABLE[instruction];
// Execute it
return opCode.execute(*this);
}
bool Cpu65816::accumulatorIs8BitWide() {
// Accumulator is always 8 bit in emulation mode.
if (mCpuStatus.emulationFlag()) return true;
// Accumulator width set to one means 8 bit accumulator.
else return mCpuStatus.accumulatorWidthFlag();
}
bool Cpu65816::accumulatorIs16BitWide() {
return !accumulatorIs8BitWide();
}
bool Cpu65816::indexIs8BitWide() {
// Index is always 8 bit in emulation mode.
if (mCpuStatus.emulationFlag()) return true;
// Index width set to one means 8 bit accumulator.
else return mCpuStatus.indexWidthFlag();
}
bool Cpu65816::indexIs16BitWide() {
return !indexIs8BitWide();
}
void Cpu65816::addToCycles(int cycles) {
mTotalCyclesCounter += cycles;
}
void Cpu65816::subtractFromCycles(int cycles) {
mTotalCyclesCounter -= cycles;
}
void Cpu65816::addToProgramAddress(int bytes) {
mProgramAddress.incrementOffsetBy(bytes);
}
void Cpu65816::addToProgramAddressAndCycles(int bytes, int cycles) {
addToCycles(cycles);
addToProgramAddress(bytes);
}
uint16_t Cpu65816::indexWithXRegister() {
return indexIs8BitWide() ? Binary::lower8BitsOf(mX) : mX;
}
uint16_t Cpu65816::indexWithYRegister() {
return indexIs8BitWide() ? Binary::lower8BitsOf(mY) : mY;
}
void Cpu65816::setProgramAddress(const Address &address) {
mProgramAddress = address;
}

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/*
* 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/>.
*/
#ifndef __CPU_65816__
#define __CPU_65816__
#include <stdint.h>
#include "SystemBus.hpp"
#include "Interrupt.hpp"
#include "Addressing.hpp"
#include "Stack.hpp"
#include "CpuStatus.hpp"
#include "opcodes/OpCode.hpp"
#include "Log.hpp"
#include "Binary.hpp"
#include "BuildConfig.hpp"
// Macro used by OpCode methods when an unrecognized OpCode is being executed.
#define LOG_UNEXPECTED_OPCODE(opCode) Log::err(LOG_TAG).str("Unexpected OpCode: ").str(opCode.getName()).show();
class Cpu65816Debugger;
class Cpu65816 {
friend class Cpu65816Debugger;
public:
Cpu65816(SystemBus &, EmulationModeInterrupts *, NativeModeInterrupts *);
void setRESPin(bool);
void setRDYPin(bool);
// Temporary
bool executeNextInstruction();
private:
SystemBus &mSystemBus;
EmulationModeInterrupts *mEmulationInterrupts;
NativeModeInterrupts *mNativeInterrupts;
// Accumulator register
uint16_t mA = 0;
// X index register
uint16_t mX = 0;
// Y index register
uint16_t mY = 0;
// Status register
CpuStatus mCpuStatus;
// Data bank register
uint8_t mDB = 0;
// Direct page register
uint16_t mD = 0;
struct {
// Reset to true means low power mode (do nothing)
bool RES = true;
// Ready to false means CPU is waiting for an NMI/IRQ/ABORT/RESET
bool RDY = false;
} mPins;
Stack mStack;
// Address of the current OpCode
Address mProgramAddress {0x00, 0x0000};
// Total number of cycles
uint64_t mTotalCyclesCounter = 0;
bool accumulatorIs8BitWide();
bool accumulatorIs16BitWide();
bool indexIs8BitWide();
bool indexIs16BitWide();
uint16_t indexWithXRegister();
uint16_t indexWithYRegister();
Address getAddressOfOpCodeData(OpCode &);
bool opCodeAddressingCrossesPageBoundary(OpCode &);
void setProgramAddress(const Address &);
void addToCycles(int);
void subtractFromCycles(int);
void addToProgramAddress(int);
void addToProgramAddressAndCycles(int, int);
// OpCode Table.
static OpCode OP_CODE_TABLE[];
// OpCodes handling routines.
// Implementations for these methods can be found in the corresponding OpCode_XXX.cpp file.
void executeORA(OpCode &);
void executeORA8Bit(OpCode &);
void executeORA16Bit(OpCode &);
void executeStack(OpCode &);
void executeStatusReg(OpCode &);
void executeMemoryROL(OpCode &);
void executeAccumulatorROL(OpCode &);
void executeROL(OpCode &);
void executeMemoryROR(OpCode &);
void executeAccumulatorROR(OpCode &);
void executeROR(OpCode &);
void executeInterrupt(OpCode &);
void executeJumpReturn(OpCode &);
void execute8BitSBC(OpCode &);
void execute16BitSBC(OpCode &);
void execute8BitBCDSBC(OpCode &);
void execute16BitBCDSBC(OpCode &);
void executeSBC(OpCode &);
void execute8BitADC(OpCode &);
void execute16BitADC(OpCode &);
void execute8BitBCDADC(OpCode &);
void execute16BitBCDADC(OpCode &);
void executeADC(OpCode &);
void executeSTA(OpCode &);
void executeSTX(OpCode &);
void executeSTY(OpCode &);
void executeSTZ(OpCode &);
void executeTransfer(OpCode &);
void executeMemoryASL(OpCode &);
void executeAccumulatorASL(OpCode &);
void executeASL(OpCode &);
void executeAND8Bit(OpCode &);
void executeAND16Bit(OpCode &);
void executeAND(OpCode &);
void executeLDA8Bit(OpCode &);
void executeLDA16Bit(OpCode &);
void executeLDA(OpCode &);
void executeLDX8Bit(OpCode &);
void executeLDX16Bit(OpCode &);
void executeLDX(OpCode &);
void executeLDY8Bit(OpCode &);
void executeLDY16Bit(OpCode &);
void executeLDY(OpCode &);
void executeEOR8Bit(OpCode &);
void executeEOR16Bit(OpCode &);
void executeEOR(OpCode &);
int executeBranchShortOnCondition(bool, OpCode &);
int executeBranchLongOnCondition(bool, OpCode &);
void executeBranch(OpCode &);
void execute8BitCMP(OpCode &);
void execute16BitCMP(OpCode &);
void executeCMP(OpCode &);
void execute8BitDecInMemory(OpCode &);
void execute16BitDecInMemory(OpCode &);
void execute8BitIncInMemory(OpCode &);
void execute16BitIncInMemory(OpCode &);
void executeINCDEC(OpCode &);
void execute8BitCPX(OpCode &);
void execute16BitCPX(OpCode &);
void execute8BitCPY(OpCode &);
void execute16BitCPY(OpCode &);