mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2025-01-03 09:29:50 +00:00
355 lines
7.7 KiB
C++
355 lines
7.7 KiB
C++
#pragma once
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#include <cstdint>
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#include "IntelProcessor.h"
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#include "InputOutput.h"
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#include "Signal.h"
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namespace EightBit {
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class Z80 : public IntelProcessor {
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public:
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enum StatusBits {
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SF = Bit7,
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ZF = Bit6,
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YF = Bit5,
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HC = Bit4,
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XF = Bit3,
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PF = Bit2,
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VF = Bit2,
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NF = Bit1,
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CF = Bit0,
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};
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Z80(Memory& memory, InputOutput& ports);
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Signal<Z80> ExecutingInstruction;
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void di();
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void ei();
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int interruptMaskable(uint8_t value) { return interrupt(true, value); }
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int interruptMaskable() { return interruptMaskable(0); }
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int interruptNonMaskable() { return interrupt(false, 0); }
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int interrupt(bool maskable, uint8_t value);
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int execute(uint8_t opcode);
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int step();
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// Mutable access to processor!!
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virtual register16_t& AF() override {
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return m_accumulatorFlags[m_accumulatorFlagsSet];
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}
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virtual register16_t& BC() override {
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return m_registers[m_registerSet][BC_IDX];
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}
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virtual register16_t& DE() override {
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return m_registers[m_registerSet][DE_IDX];
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}
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virtual register16_t& HL() override {
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return m_registers[m_registerSet][HL_IDX];
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}
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register16_t& IX() { return m_ix; }
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uint8_t& IXH() { return IX().high; }
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uint8_t& IXL() { return IX().low; }
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register16_t& IY() { return m_iy; }
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uint8_t& IYH() { return IY().high; }
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uint8_t& IYL() { return IY().low; }
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uint8_t& REFRESH() { return m_refresh; }
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uint8_t& IV() { return iv; }
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int& IM() { return m_interruptMode; }
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bool& IFF1() { return m_iff1; }
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bool& IFF2() { return m_iff2; }
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bool& M1() { return m1; }
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void exx() {
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m_registerSet ^= 1;
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}
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void exxAF() {
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m_accumulatorFlagsSet = !m_accumulatorFlagsSet;
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}
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virtual void reset();
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virtual void initialise();
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protected:
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InputOutput& m_ports;
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enum { BC_IDX, DE_IDX, HL_IDX };
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std::array<std::array<register16_t, 3>, 2> m_registers;
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int m_registerSet;
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std::array<register16_t, 2> m_accumulatorFlags;
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int m_accumulatorFlagsSet;
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register16_t m_ix;
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register16_t m_iy;
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uint8_t m_refresh;
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uint8_t iv;
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int m_interruptMode;
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bool m_iff1;
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bool m_iff2;
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bool m1;
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bool m_prefixCB;
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bool m_prefixDD;
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bool m_prefixED;
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bool m_prefixFD;
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int8_t m_displacement;
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bool m_displaced;
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int fetchExecute() {
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M1() = true;
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return execute(fetchByte());
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}
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void incrementRefresh() {
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REFRESH() = (REFRESH() & Bit7) | (REFRESH() + 1) & Mask7;
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}
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uint8_t& DISPLACED() {
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m_memory.ADDRESS().word = MEMPTR().word = (m_prefixDD ? IX() : IY()).word + m_displacement;
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return m_memory.reference();
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}
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uint8_t& R(int r) {
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switch (r) {
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case 0:
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return B();
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case 1:
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return C();
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case 2:
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return D();
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case 3:
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return E();
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case 4:
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return HL2().high;
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case 5:
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return HL2().low;
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case 6:
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if (m_displaced) {
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m_displacement = fetchByte();
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return DISPLACED();
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}
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m_memory.ADDRESS() = HL();
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return m_memory.reference();
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case 7:
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return A();
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}
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throw std::logic_error("Unhandled registry mechanism");
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}
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uint8_t& R2(int r) {
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switch (r) {
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case 0:
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return B();
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case 1:
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return C();
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case 2:
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return D();
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case 3:
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return E();
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case 4:
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return H();
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case 5:
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return L();
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case 6:
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m_memory.ADDRESS() = HL();
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return m_memory.reference();
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case 7:
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return A();
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}
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throw std::logic_error("Unhandled registry mechanism");
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}
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register16_t& RP(int rp) {
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switch (rp) {
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case 3:
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return SP();
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case HL_IDX:
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return HL2();
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default:
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return m_registers[m_registerSet][rp];
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}
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}
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register16_t& HL2() {
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if (m_displaced) {
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if (m_prefixDD)
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return IX();
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else if (m_prefixFD)
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return IY();
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}
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return HL();
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}
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register16_t& RP2(int rp) {
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switch (rp) {
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case 3:
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return AF();
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case HL_IDX:
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return HL2();
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default:
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return m_registers[m_registerSet][rp];
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}
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}
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void addViaMemptr(register16_t& hl, register16_t operand) {
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MEMPTR().word = hl.word + 1;
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add(hl, operand);
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}
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void sbcViaMemptr(register16_t& hl, register16_t operand) {
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MEMPTR().word = hl.word + 1;
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sbc(hl, operand);
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}
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void adcViaMemptr(register16_t& hl, register16_t operand) {
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MEMPTR().word = hl.word + 1;
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adc(hl, operand);
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}
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static void adjustHalfCarryAdd(uint8_t& f, uint8_t before, uint8_t value, int calculation) {
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setFlag(f, HC, calculateHalfCarryAdd(before, value, calculation));
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}
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static void adjustHalfCarrySub(uint8_t& f, uint8_t before, uint8_t value, int calculation) {
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setFlag(f, HC, calculateHalfCarrySub(before, value, calculation));
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}
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static void adjustOverflowAdd(uint8_t& f, uint8_t before, uint8_t value, uint8_t calculation) {
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adjustOverflowAdd(f, before & SF, value & SF, calculation & SF);
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}
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static void adjustOverflowAdd(uint8_t& f, int beforeNegative, int valueNegative, int afterNegative) {
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auto overflow = (beforeNegative == valueNegative) && (beforeNegative != afterNegative);
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setFlag(f, VF, overflow);
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}
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static void adjustOverflowSub(uint8_t& f, uint8_t before, uint8_t value, uint8_t calculation) {
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adjustOverflowSub(f, before & SF, value & SF, calculation & SF);
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}
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static void adjustOverflowSub(uint8_t& f, int beforeNegative, int valueNegative, int afterNegative) {
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auto overflow = (beforeNegative != valueNegative) && (beforeNegative != afterNegative);
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setFlag(f, VF, overflow);
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}
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void executeCB(int x, int y, int z, int p, int q);
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void executeED(int x, int y, int z, int p, int q);
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void executeOther(int x, int y, int z, int p, int q);
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static void adjustSign(uint8_t& f, uint8_t value);
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static void adjustZero(uint8_t& f, uint8_t value);
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static void adjustParity(uint8_t& f, uint8_t value);
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static void adjustSZ(uint8_t& f, uint8_t value);
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static void adjustSZP(uint8_t& f, uint8_t value);
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static void adjustXY(uint8_t& f, uint8_t value);
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static void adjustSZPXY(uint8_t& f, uint8_t value);
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static void adjustSZXY(uint8_t& f, uint8_t value);
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void postIncrement(uint8_t& f, uint8_t value);
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void postDecrement(uint8_t& f, uint8_t value);
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void retn();
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void reti();
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bool jrConditionalFlag(int flag);
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bool returnConditionalFlag(int flag);
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bool jumpConditionalFlag(int flag);
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bool callConditionalFlag(int flag);
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void sbc(register16_t& operand, register16_t value);
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void adc(register16_t& operand, register16_t value);
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void add(register16_t& operand, register16_t value);
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void add(uint8_t& operand, uint8_t value, int carry = 0);
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void adc(uint8_t& operand, uint8_t value);
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void sub(uint8_t& operand, uint8_t value, int carry = 0);
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void sbc(uint8_t& operand, uint8_t value);
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void andr(uint8_t& operand, uint8_t value);
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void xorr(uint8_t& operand, uint8_t value);
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void orr(uint8_t& operand, uint8_t value);
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void compare(uint8_t value);
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uint8_t& rlc(uint8_t& operand);
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uint8_t& rrc(uint8_t& operand);
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uint8_t& rl(uint8_t& operand);
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uint8_t& rr(uint8_t& operand);
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uint8_t& sla(uint8_t& operand);
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uint8_t& sra(uint8_t& operand);
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uint8_t& sll(uint8_t& operand);
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uint8_t& srl(uint8_t& operand);
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uint8_t& bit(int n, uint8_t& operand);
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uint8_t& res(int n, uint8_t& operand);
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uint8_t& set(int nit, uint8_t& operand);
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void daa();
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void scf();
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void ccf();
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void cpl();
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void xhtl(register16_t& operand);
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void xhtl();
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void blockCompare();
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void cpi();
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bool cpir();
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void cpd();
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bool cpdr();
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void blockLoad(register16_t source, register16_t destination);
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void ldi();
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bool ldir();
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void ldd();
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bool lddr();
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void ini();
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bool inir();
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void ind();
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bool indr();
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void blockOut();
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void outi();
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bool otir();
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void outd();
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bool otdr();
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void neg();
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void rrd();
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void rld();
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void writePort() {
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m_ports.write(m_memory.ADDRESS().low, m_memory.DATA());
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}
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void readPort() {
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m_memory.placeDATA(m_ports.read(m_memory.ADDRESS().low));
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}
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};
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} |