mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2024-12-26 19:29:20 +00:00
458 lines
9.3 KiB
C++
458 lines
9.3 KiB
C++
#pragma once
|
|
|
|
#include <cstdint>
|
|
#include <string>
|
|
#include <array>
|
|
#include <functional>
|
|
|
|
#include "Memory.h"
|
|
#include "Processor.h"
|
|
#include "ProcessorType.h"
|
|
#include "StatusFlags.h"
|
|
#include "AddressingMode.h"
|
|
#include "Signal.h"
|
|
|
|
namespace EightBit {
|
|
class MOS6502 : public Processor {
|
|
public:
|
|
typedef std::function<void()> instruction_t;
|
|
|
|
struct Instruction {
|
|
instruction_t vector = nullptr;
|
|
int count = 0;
|
|
AddressingMode mode = AddressingMode::Illegal;
|
|
std::string display = "";
|
|
};
|
|
|
|
MOS6502(Memory& memory, ProcessorType level);
|
|
|
|
Signal<MOS6502> ExecutingInstruction;
|
|
Signal<MOS6502> ExecutedInstruction;
|
|
|
|
ProcessorType getLevel() const { return level; }
|
|
|
|
uint8_t& X() { return x; }
|
|
uint8_t& Y() { return y; }
|
|
uint8_t& A() { return a; }
|
|
uint8_t& S() { return s; }
|
|
|
|
StatusFlags& P() { return p; }
|
|
|
|
const Instruction& getInstruction(uint8_t code) const {
|
|
return instructions[code];
|
|
}
|
|
|
|
virtual void initialise();
|
|
|
|
virtual int step();
|
|
|
|
virtual void Reset();
|
|
|
|
virtual void TriggerIRQ();
|
|
virtual void TriggerNMI();
|
|
|
|
void GetWord(register16_t& output);
|
|
void GetWord(uint16_t offset, register16_t& output);
|
|
|
|
uint8_t GetByte() { return m_memory.read(); }
|
|
uint8_t GetByte(uint16_t offset) { return m_memory.read(offset); }
|
|
|
|
void SetByte(uint8_t value) { m_memory.write(value); }
|
|
void SetByte(uint16_t offset, uint8_t value) { m_memory.write(offset, value); }
|
|
|
|
protected:
|
|
virtual void Interrupt(uint16_t vector);
|
|
|
|
virtual int Execute(uint8_t cell);
|
|
|
|
void ___();
|
|
|
|
private:
|
|
static Instruction INS(instruction_t method, int cycles, AddressingMode addressing, std::string display);
|
|
|
|
void Install6502Instructions();
|
|
void Install65sc02Instructions();
|
|
void Install65c02Instructions();
|
|
|
|
void InstallInstructionSet(const std::array<Instruction, 0x100>& basis);
|
|
void OverlayInstructionSet(const std::array<Instruction, 0x100>& overlay);
|
|
void OverlayInstructionSet(const std::array<Instruction, 0x100>& overlay, bool includeIllegal);
|
|
|
|
void UpdateZeroFlag(uint8_t datum) { p.zero = datum == 0; }
|
|
void UpdateNegativeFlag(uint8_t datum) { p.negative = (datum & StatusFlags::Negative) != 0; }
|
|
|
|
void UpdateZeroNegativeFlags(uint8_t datum) {
|
|
UpdateZeroFlag(datum);
|
|
UpdateNegativeFlag(datum);
|
|
}
|
|
|
|
void PushByte(uint8_t value);
|
|
uint8_t PopByte();
|
|
void PushWord(register16_t value);
|
|
void PopWord(register16_t& output);
|
|
|
|
uint8_t FetchByte();
|
|
void FetchWord(register16_t& output);
|
|
|
|
void Address_ZeroPage(register16_t& output);
|
|
void Address_ZeroPageX(register16_t& output);
|
|
void Address_ZeroPageY(register16_t& output);
|
|
void Address_IndexedIndirectX(register16_t& output);
|
|
void Address_IndexedIndirectY_Read(register16_t& output);
|
|
void Address_IndexedIndirectY_Write(register16_t& output);
|
|
void Address_Absolute(register16_t& output);
|
|
void Address_AbsoluteXIndirect(register16_t& output);
|
|
void Address_AbsoluteX_Read(register16_t& output);
|
|
void Address_AbsoluteX_Write(register16_t& output);
|
|
void Address_AbsoluteY_Read(register16_t& output);
|
|
void Address_AbsoluteY_Write(register16_t& output);
|
|
void Address_ZeroPageIndirect(register16_t& output);
|
|
|
|
uint8_t ReadByte_Immediate();
|
|
int8_t ReadByte_ImmediateDisplacement();
|
|
uint8_t ReadByte_ZeroPage();
|
|
uint8_t ReadByte_ZeroPageX();
|
|
uint8_t ReadByte_ZeroPageY();
|
|
uint8_t ReadByte_Absolute();
|
|
uint8_t ReadByte_AbsoluteX();
|
|
uint8_t ReadByte_AbsoluteY();
|
|
uint8_t ReadByte_IndexedIndirectX();
|
|
uint8_t ReadByte_IndirectIndexedY();
|
|
uint8_t ReadByte_ZeroPageIndirect();
|
|
|
|
void WriteByte_ZeroPage(uint8_t value);
|
|
void WriteByte_Absolute(uint8_t value);
|
|
void WriteByte_AbsoluteX(uint8_t value);
|
|
void WriteByte_AbsoluteY(uint8_t value);
|
|
void WriteByte_ZeroPageX(uint8_t value);
|
|
void WriteByte_ZeroPageY(uint8_t value);
|
|
void WriteByte_IndirectIndexedY(uint8_t value);
|
|
void WriteByte_IndexedIndirectX(uint8_t value);
|
|
void WriteByte_ZeroPageIndirect(uint8_t value);
|
|
|
|
void DEC(uint16_t offset);
|
|
|
|
uint8_t ROR(uint8_t data);
|
|
void ROR(uint16_t offset);
|
|
|
|
uint8_t LSR(uint8_t data);
|
|
void LSR(uint16_t offset);
|
|
|
|
void BIT_immediate(uint8_t data);
|
|
void BIT(uint8_t data);
|
|
|
|
void TSB(uint16_t address);
|
|
void TRB(uint16_t address);
|
|
|
|
void INC(uint16_t offset);
|
|
|
|
void ROL(uint16_t offset);
|
|
uint8_t ROL(uint8_t data);
|
|
|
|
void ASL(uint16_t offset);
|
|
uint8_t ASL(uint8_t data);
|
|
|
|
void ORA(uint8_t data);
|
|
|
|
void AND(uint8_t data);
|
|
|
|
void SBC(uint8_t data);
|
|
void SBC_b(uint8_t data);
|
|
void SBC_d(uint8_t data);
|
|
|
|
void EOR(uint8_t data);
|
|
|
|
void CPX(uint8_t data);
|
|
void CPY(uint8_t data);
|
|
void CMP(uint8_t data);
|
|
void CMP(uint8_t first, uint8_t second);
|
|
|
|
void LDA(uint8_t data);
|
|
void LDY(uint8_t data);
|
|
void LDX(uint8_t data);
|
|
|
|
void ADC(uint8_t data);
|
|
void ADC_b(uint8_t data);
|
|
void ADC_d(uint8_t data);
|
|
|
|
void RMB(uint16_t address, uint8_t flag);
|
|
void SMB(uint16_t address, uint8_t flag);
|
|
|
|
void Branch(int8_t displacement);
|
|
void Branch();
|
|
void Branch(bool flag);
|
|
void BitBranch_Clear(uint8_t check);
|
|
void BitBranch_Set(uint8_t check);
|
|
|
|
void NOP_imp();
|
|
void NOP2_imp();
|
|
void NOP3_imp();
|
|
|
|
void ORA_xind();
|
|
void ORA_zp();
|
|
void ORA_imm();
|
|
void ORA_abs();
|
|
void ORA_absx();
|
|
void ORA_absy();
|
|
void ORA_zpx();
|
|
void ORA_indy();
|
|
void ORA_zpind();
|
|
|
|
void AND_zpx();
|
|
void AND_indy();
|
|
void AND_zp();
|
|
void AND_absx();
|
|
void AND_absy();
|
|
void AND_imm();
|
|
void AND_xind();
|
|
void AND_abs();
|
|
void AND_zpind();
|
|
|
|
void EOR_absx();
|
|
void EOR_absy();
|
|
void EOR_zpx();
|
|
void EOR_indy();
|
|
void EOR_abs();
|
|
void EOR_imm();
|
|
void EOR_zp();
|
|
void EOR_xind();
|
|
void EOR_zpind();
|
|
|
|
void LDA_absx();
|
|
void LDA_absy();
|
|
void LDA_zpx();
|
|
void LDA_indy();
|
|
void LDA_abs();
|
|
void LDA_imm();
|
|
void LDA_zp();
|
|
void LDA_xind();
|
|
void LDA_zpind();
|
|
|
|
void LDX_imm();
|
|
void LDX_zp();
|
|
void LDX_abs();
|
|
void LDX_zpy();
|
|
void LDX_absy();
|
|
|
|
void LDY_imm();
|
|
void LDY_zp();
|
|
void LDY_abs();
|
|
void LDY_zpx();
|
|
void LDY_absx();
|
|
|
|
void CMP_absx();
|
|
void CMP_absy();
|
|
void CMP_zpx();
|
|
void CMP_indy();
|
|
void CMP_abs();
|
|
void CMP_imm();
|
|
void CMP_zp();
|
|
void CMP_xind();
|
|
void CMP_zpind();
|
|
|
|
void CPX_abs();
|
|
void CPX_zp();
|
|
void CPX_imm();
|
|
|
|
void CPY_imm();
|
|
void CPY_zp();
|
|
void CPY_abs();
|
|
|
|
void ADC_zp();
|
|
void ADC_xind();
|
|
void ADC_imm();
|
|
void ADC_abs();
|
|
void ADC_zpx();
|
|
void ADC_indy();
|
|
void ADC_absx();
|
|
void ADC_absy();
|
|
void ADC_zpind();
|
|
|
|
void SBC_xind();
|
|
void SBC_zp();
|
|
void SBC_imm();
|
|
void SBC_abs();
|
|
void SBC_zpx();
|
|
void SBC_indy();
|
|
void SBC_absx();
|
|
void SBC_absy();
|
|
void SBC_zpind();
|
|
|
|
void BIT_imm();
|
|
void BIT_zp();
|
|
void BIT_zpx();
|
|
void BIT_abs();
|
|
void BIT_absx();
|
|
|
|
void DEC_a();
|
|
void DEC_absx();
|
|
void DEC_zpx();
|
|
void DEC_abs();
|
|
void DEC_zp();
|
|
|
|
void DEX_imp();
|
|
void DEY_imp();
|
|
|
|
void INC_a();
|
|
void INC_zp();
|
|
void INC_absx();
|
|
void INC_zpx();
|
|
void INC_abs();
|
|
|
|
void INX_imp();
|
|
void INY_imp();
|
|
|
|
void STX_zpy();
|
|
void STX_abs();
|
|
void STX_zp();
|
|
|
|
void STY_zpx();
|
|
void STY_abs();
|
|
void STY_zp();
|
|
|
|
void STA_absx();
|
|
void STA_absy();
|
|
void STA_zpx();
|
|
void STA_indy();
|
|
void STA_abs();
|
|
void STA_zp();
|
|
void STA_xind();
|
|
void STA_zpind();
|
|
|
|
void STZ_zp();
|
|
void STZ_zpx();
|
|
void STZ_abs();
|
|
void STZ_absx();
|
|
|
|
void TSX_imp();
|
|
void TAX_imp();
|
|
void TAY_imp();
|
|
void TXS_imp();
|
|
void TYA_imp();
|
|
void TXA_imp();
|
|
|
|
void PHP_imp();
|
|
void PLP_imp();
|
|
void PLA_imp();
|
|
void PHA_imp();
|
|
void PHX_imp();
|
|
void PHY_imp();
|
|
void PLX_imp();
|
|
void PLY_imp();
|
|
|
|
void ASL_a();
|
|
void ASL_zp();
|
|
void ASL_abs();
|
|
void ASL_absx();
|
|
void ASL_zpx();
|
|
|
|
void LSR_absx();
|
|
void LSR_zpx();
|
|
void LSR_abs();
|
|
void LSR_a();
|
|
void LSR_zp();
|
|
|
|
void ROL_absx();
|
|
void ROL_zpx();
|
|
void ROL_abs();
|
|
void ROL_a();
|
|
void ROL_zp();
|
|
|
|
void ROR_absx();
|
|
void ROR_zpx();
|
|
void ROR_abs();
|
|
void ROR_a();
|
|
void ROR_zp();
|
|
|
|
void TSB_zp();
|
|
void TSB_abs();
|
|
|
|
void TRB_zp();
|
|
void TRB_abs();
|
|
|
|
void RMB0_zp();
|
|
void RMB1_zp();
|
|
void RMB2_zp();
|
|
void RMB3_zp();
|
|
void RMB4_zp();
|
|
void RMB5_zp();
|
|
void RMB6_zp();
|
|
void RMB7_zp();
|
|
|
|
void SMB0_zp();
|
|
void SMB1_zp();
|
|
void SMB2_zp();
|
|
void SMB3_zp();
|
|
void SMB4_zp();
|
|
void SMB5_zp();
|
|
void SMB6_zp();
|
|
void SMB7_zp();
|
|
|
|
void JSR_abs();
|
|
void RTI_imp();
|
|
void RTS_imp();
|
|
void JMP_abs();
|
|
void JMP_ind();
|
|
void JMP_absxind();
|
|
void BRK_imp();
|
|
|
|
void WAI_imp();
|
|
void STP_imp();
|
|
|
|
void SED_imp();
|
|
void CLD_imp();
|
|
void CLV_imp();
|
|
void SEI_imp();
|
|
void CLI_imp();
|
|
void CLC_imp();
|
|
void SEC_imp();
|
|
|
|
void BMI_rel();
|
|
void BPL_rel();
|
|
void BVC_rel();
|
|
void BVS_rel();
|
|
void BCC_rel();
|
|
void BCS_rel();
|
|
void BNE_rel();
|
|
void BEQ_rel();
|
|
void BRA_rel();
|
|
|
|
void BBR0_zprel();
|
|
void BBR1_zprel();
|
|
void BBR2_zprel();
|
|
void BBR3_zprel();
|
|
void BBR4_zprel();
|
|
void BBR5_zprel();
|
|
void BBR6_zprel();
|
|
void BBR7_zprel();
|
|
|
|
void BBS0_zprel();
|
|
void BBS1_zprel();
|
|
void BBS2_zprel();
|
|
void BBS3_zprel();
|
|
void BBS4_zprel();
|
|
void BBS5_zprel();
|
|
void BBS6_zprel();
|
|
void BBS7_zprel();
|
|
|
|
const uint16_t PageOne = 0x100;
|
|
const uint16_t IRQvector = 0xfffe;
|
|
const uint16_t RSTvector = 0xfffc;
|
|
const uint16_t NMIvector = 0xfffa;
|
|
|
|
uint8_t x; // index register X
|
|
uint8_t y; // index register Y
|
|
uint8_t a; // accumulator
|
|
uint8_t s; // stack pointer
|
|
|
|
StatusFlags p = 0; // processor status
|
|
|
|
std::array<Instruction, 0x100> instructions;
|
|
|
|
ProcessorType level;
|
|
|
|
std::array<Instruction, 0x100> overlay6502;
|
|
std::array<Instruction, 0x100> overlay65sc02;
|
|
std::array<Instruction, 0x100> overlay65c02;
|
|
};
|
|
} |