mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2024-12-23 15:29:24 +00:00
469 lines
9.4 KiB
C++
469 lines
9.4 KiB
C++
#pragma once
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#include <cstdint>
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#include <string>
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#include <array>
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#include <functional>
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#include "ProcessorType.h"
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#include "StatusFlags.h"
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#include "AddressingMode.h"
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#include "Signal.h"
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namespace EightBit {
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class MOS6502 {
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public:
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typedef std::function<void()> instruction_t;
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struct Instruction {
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instruction_t vector = nullptr;
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uint64_t count = 0;
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AddressingMode mode = AddressingMode::Illegal;
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std::string display = "";
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};
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MOS6502(ProcessorType level);
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Signal<MOS6502> ExecutingInstruction;
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ProcessorType getLevel() const { return level; }
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uint64_t getCycles() const { return cycles; }
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bool getProceed() const { return proceed; }
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void setProceed(bool value) { proceed = value; }
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uint16_t getPC() const { return pc; }
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uint8_t getX() const { return x; }
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uint8_t getY() const { return y; }
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uint8_t getA() const { return a; }
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uint8_t getS() const { return s; }
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const StatusFlags& getP() const { return p; }
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const Instruction& getInstruction(uint8_t code) const {
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return instructions[code];
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}
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virtual void Initialise();
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virtual void Start(uint16_t address);
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virtual void Run();
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virtual void Step();
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virtual void Reset();
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virtual void TriggerIRQ();
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virtual void TriggerNMI();
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uint16_t GetWord(uint16_t offset) const;
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virtual uint8_t GetByte(uint16_t offset) const = 0;
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virtual void SetByte(uint16_t offset, uint8_t value) = 0;
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protected:
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virtual void Interrupt(uint16_t vector);
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virtual void Execute(uint8_t cell);
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void ___();
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void ResetRegisters();
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private:
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static Instruction INS(instruction_t method, uint64_t cycles, AddressingMode addressing, std::string display);
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static uint8_t LowNybble(uint8_t value);
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static uint8_t HighNybble(uint8_t value);
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static uint8_t PromoteNybble(uint8_t value);
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static uint8_t DemoteNybble(uint8_t value);
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static uint8_t LowByte(uint16_t value);
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static uint8_t HighByte(uint16_t value);
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static uint16_t MakeWord(uint8_t low, uint8_t high);
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void Install6502Instructions();
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void Install65sc02Instructions();
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void Install65c02Instructions();
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void InstallInstructionSet(std::array<Instruction, 0x100> basis);
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void OverlayInstructionSet(std::array<Instruction, 0x100> overlay);
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void OverlayInstructionSet(std::array<Instruction, 0x100> overlay, bool includeIllegal);
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bool UpdateZeroFlag(uint8_t datum);
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bool UpdateNegativeFlag(int8_t datum);
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void UpdateZeroNegativeFlags(uint8_t datum);
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void PushByte(uint8_t value);
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uint8_t PopByte();
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void PushWord(uint16_t value);
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uint16_t PopWord();
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uint8_t FetchByte();
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uint16_t FetchWord();
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uint16_t Address_ZeroPage();
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uint16_t Address_ZeroPageX();
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uint16_t Address_ZeroPageY();
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uint16_t Address_IndexedIndirectX();
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uint16_t Address_IndexedIndirectY_Read();
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uint16_t Address_IndexedIndirectY_Write();
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uint16_t Address_Absolute();
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uint16_t Address_AbsoluteXIndirect();
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uint16_t Address_AbsoluteX_Read();
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uint16_t Address_AbsoluteX_Write();
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uint16_t Address_AbsoluteY_Read();
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uint16_t Address_AbsoluteY_Write();
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uint16_t Address_ZeroPageIndirect();
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uint8_t ReadByte_Immediate();
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int8_t ReadByte_ImmediateDisplacement();
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uint8_t ReadByte_ZeroPage();
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uint8_t ReadByte_ZeroPageX();
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uint8_t ReadByte_ZeroPageY();
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uint8_t ReadByte_Absolute();
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uint8_t ReadByte_AbsoluteX();
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uint8_t ReadByte_AbsoluteY();
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uint8_t ReadByte_IndexedIndirectX();
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uint8_t ReadByte_IndirectIndexedY();
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uint8_t ReadByte_ZeroPageIndirect();
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void WriteByte_ZeroPage(uint8_t value);
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void WriteByte_Absolute(uint8_t value);
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void WriteByte_AbsoluteX(uint8_t value);
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void WriteByte_AbsoluteY(uint8_t value);
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void WriteByte_ZeroPageX(uint8_t value);
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void WriteByte_ZeroPageY(uint8_t value);
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void WriteByte_IndirectIndexedY(uint8_t value);
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void WriteByte_IndexedIndirectX(uint8_t value);
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void WriteByte_ZeroPageIndirect(uint8_t value);
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void DEC(uint16_t offset);
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uint8_t ROR(uint8_t data);
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void ROR(uint16_t offset);
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uint8_t LSR(uint8_t data);
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void LSR(uint16_t offset);
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void BIT_immediate(uint8_t data);
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void BIT(uint8_t data);
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void TSB(uint16_t address);
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void TRB(uint16_t address);
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void INC(uint16_t offset);
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void ROL(uint16_t offset);
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uint8_t ROL(uint8_t data);
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void ASL(uint16_t offset);
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uint8_t ASL(uint8_t data);
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void ORA(uint8_t data);
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void AND(uint8_t data);
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void SBC(uint8_t data);
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void SBC_b(uint8_t data);
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void SBC_d(uint8_t data);
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void EOR(uint8_t data);
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void CPX(uint8_t data);
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void CPY(uint8_t data);
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void CMP(uint8_t data);
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void CMP(uint8_t first, uint8_t second);
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void LDA(uint8_t data);
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void LDY(uint8_t data);
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void LDX(uint8_t data);
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void ADC(uint8_t data);
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void ADC_b(uint8_t data);
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void ADC_d(uint8_t data);
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void RMB(uint16_t address, uint8_t flag);
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void SMB(uint16_t address, uint8_t flag);
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void Branch(int8_t displacement);
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void Branch();
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void Branch(bool flag);
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void BitBranch_Clear(uint8_t check);
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void BitBranch_Set(uint8_t check);
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void NOP_imp();
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void NOP2_imp();
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void NOP3_imp();
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void ORA_xind();
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void ORA_zp();
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void ORA_imm();
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void ORA_abs();
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void ORA_absx();
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void ORA_absy();
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void ORA_zpx();
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void ORA_indy();
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void ORA_zpind();
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void AND_zpx();
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void AND_indy();
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void AND_zp();
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void AND_absx();
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void AND_absy();
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void AND_imm();
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void AND_xind();
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void AND_abs();
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void AND_zpind();
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void EOR_absx();
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void EOR_absy();
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void EOR_zpx();
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void EOR_indy();
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void EOR_abs();
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void EOR_imm();
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void EOR_zp();
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void EOR_xind();
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void EOR_zpind();
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void LDA_absx();
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void LDA_absy();
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void LDA_zpx();
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void LDA_indy();
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void LDA_abs();
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void LDA_imm();
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void LDA_zp();
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void LDA_xind();
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void LDA_zpind();
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void LDX_imm();
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void LDX_zp();
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void LDX_abs();
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void LDX_zpy();
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void LDX_absy();
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void LDY_imm();
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void LDY_zp();
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void LDY_abs();
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void LDY_zpx();
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void LDY_absx();
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void CMP_absx();
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void CMP_absy();
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void CMP_zpx();
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void CMP_indy();
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void CMP_abs();
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void CMP_imm();
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void CMP_zp();
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void CMP_xind();
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void CMP_zpind();
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void CPX_abs();
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void CPX_zp();
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void CPX_imm();
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void CPY_imm();
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void CPY_zp();
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void CPY_abs();
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void ADC_zp();
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void ADC_xind();
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void ADC_imm();
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void ADC_abs();
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void ADC_zpx();
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void ADC_indy();
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void ADC_absx();
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void ADC_absy();
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void ADC_zpind();
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void SBC_xind();
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void SBC_zp();
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void SBC_imm();
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void SBC_abs();
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void SBC_zpx();
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void SBC_indy();
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void SBC_absx();
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void SBC_absy();
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void SBC_zpind();
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void BIT_imm();
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void BIT_zp();
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void BIT_zpx();
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void BIT_abs();
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void BIT_absx();
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void DEC_a();
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void DEC_absx();
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void DEC_zpx();
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void DEC_abs();
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void DEC_zp();
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void DEX_imp();
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void DEY_imp();
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void INC_a();
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void INC_zp();
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void INC_absx();
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void INC_zpx();
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void INC_abs();
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void INX_imp();
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void INY_imp();
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void STX_zpy();
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void STX_abs();
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void STX_zp();
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void STY_zpx();
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void STY_abs();
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void STY_zp();
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void STA_absx();
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void STA_absy();
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void STA_zpx();
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void STA_indy();
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void STA_abs();
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void STA_zp();
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void STA_xind();
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void STA_zpind();
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void STZ_zp();
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void STZ_zpx();
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void STZ_abs();
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void STZ_absx();
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void TSX_imp();
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void TAX_imp();
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void TAY_imp();
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void TXS_imp();
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void TYA_imp();
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void TXA_imp();
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void PHP_imp();
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void PLP_imp();
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void PLA_imp();
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void PHA_imp();
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void PHX_imp();
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void PHY_imp();
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void PLX_imp();
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void PLY_imp();
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void ASL_a();
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void ASL_zp();
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void ASL_abs();
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void ASL_absx();
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void ASL_zpx();
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void LSR_absx();
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void LSR_zpx();
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void LSR_abs();
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void LSR_a();
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void LSR_zp();
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void ROL_absx();
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void ROL_zpx();
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void ROL_abs();
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void ROL_a();
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void ROL_zp();
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void ROR_absx();
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void ROR_zpx();
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void ROR_abs();
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void ROR_a();
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void ROR_zp();
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void TSB_zp();
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void TSB_abs();
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void TRB_zp();
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void TRB_abs();
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void RMB0_zp();
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void RMB1_zp();
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void RMB2_zp();
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void RMB3_zp();
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void RMB4_zp();
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void RMB5_zp();
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void RMB6_zp();
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void RMB7_zp();
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void SMB0_zp();
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void SMB1_zp();
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void SMB2_zp();
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void SMB3_zp();
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void SMB4_zp();
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void SMB5_zp();
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void SMB6_zp();
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void SMB7_zp();
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void JSR_abs();
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void RTI_imp();
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void RTS_imp();
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void JMP_abs();
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void JMP_ind();
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void JMP_absxind();
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void BRK_imp();
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void WAI_imp();
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void STP_imp();
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void SED_imp();
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void CLD_imp();
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void CLV_imp();
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void SEI_imp();
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void CLI_imp();
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void CLC_imp();
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void SEC_imp();
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void BMI_rel();
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void BPL_rel();
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void BVC_rel();
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void BVS_rel();
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void BCC_rel();
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void BCS_rel();
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void BNE_rel();
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void BEQ_rel();
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void BRA_rel();
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void BBR0_zprel();
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void BBR1_zprel();
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void BBR2_zprel();
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void BBR3_zprel();
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void BBR4_zprel();
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void BBR5_zprel();
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void BBR6_zprel();
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void BBR7_zprel();
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void BBS0_zprel();
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void BBS1_zprel();
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void BBS2_zprel();
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void BBS3_zprel();
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void BBS4_zprel();
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void BBS5_zprel();
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void BBS6_zprel();
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void BBS7_zprel();
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const uint16_t PageOne = 0x100;
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const uint16_t IRQvector = 0xfffe;
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const uint16_t RSTvector = 0xfffc;
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const uint16_t NMIvector = 0xfffa;
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uint16_t pc; // program counter
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uint8_t x; // index register X
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uint8_t y; // index register Y
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uint8_t a; // accumulator
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uint8_t s; // stack pointer
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StatusFlags p = 0; // processor status
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uint64_t cycles;
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bool proceed = true;
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std::array<Instruction, 0x100> instructions;
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ProcessorType level;
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std::array<Instruction, 0x100> overlay6502;
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std::array<Instruction, 0x100> overlay65sc02;
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std::array<Instruction, 0x100> overlay65c02;
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};
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} |