559 lines
18 KiB
C++
559 lines
18 KiB
C++
#pragma once
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#include <cstdint>
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#include <array>
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#include <functional>
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#include <IntelProcessor.h>
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#include <EventArgs.h>
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#include <Signal.h>
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#include <Register.h>
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namespace EightBit {
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class Bus;
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class Z80 final : public IntelProcessor {
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public:
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// ** From the Z80 CPU User Manual
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// RFSH.Refresh(output, active Low). RFSH, together with MREQ, indicates that the lower
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// seven bits of the system’s address bus can be used as a refresh address to the system’s
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// dynamic memories.
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DECLARE_PIN_OUTPUT(RFSH)
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DECLARE_PIN_INPUT(NMI)
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DECLARE_PIN_OUTPUT(M1)
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DECLARE_PIN_OUTPUT(MREQ)
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DECLARE_PIN_OUTPUT(IORQ)
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DECLARE_PIN_OUTPUT(RD)
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DECLARE_PIN_OUTPUT(WR)
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private:
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DEFINE_PIN_ACTIVATOR_LOW(RFSH)
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DEFINE_PIN_ACTIVATOR_LOW(M1)
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DEFINE_PIN_ACTIVATOR_LOW(MREQ)
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DEFINE_PIN_ACTIVATOR_LOW(IORQ)
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DEFINE_PIN_ACTIVATOR_LOW(RD)
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DEFINE_PIN_ACTIVATOR_LOW(WR)
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public:
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struct refresh_t {
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bool high : 1;
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uint8_t variable : 7;
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constexpr refresh_t(const uint8_t value) noexcept
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: high(!!(value & Bit7)),
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variable(value & Mask7)
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{ }
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constexpr operator uint8_t() const noexcept {
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return (high << 7) | variable;
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}
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constexpr auto& operator++() noexcept {
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++variable;
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return *this;
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}
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};
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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(Bus& bus);
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Z80(const Z80& rhs);
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bool operator==(const Z80& rhs) const;
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Signal<Z80> ExecutingInstruction;
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Signal<Z80> ExecutedInstruction;
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Signal<EventArgs> ReadingMemory;
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Signal<EventArgs> ReadMemory;
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Signal<EventArgs> WritingMemory;
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Signal<EventArgs> WrittenMemory;
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Signal<EventArgs> ReadingIO;
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Signal<EventArgs> ReadIO;
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Signal<EventArgs> WritingIO;
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Signal<EventArgs> WrittenIO;
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void execute() noexcept final;
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int step() noexcept final;
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[[nodiscard]] const register16_t& AF() const noexcept final;
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[[nodiscard]] auto& AF() noexcept { return IntelProcessor::AF(); }
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[[nodiscard]] const register16_t& BC() const noexcept final;
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[[nodiscard]] auto& BC() noexcept { return IntelProcessor::BC(); }
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[[nodiscard]] const register16_t& DE() const noexcept final;
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[[nodiscard]] auto& DE() noexcept { return IntelProcessor::DE(); }
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[[nodiscard]] const register16_t& HL() const noexcept final;
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[[nodiscard]] auto& HL() noexcept { return IntelProcessor::HL(); }
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[[nodiscard]] constexpr const auto& IX() const noexcept { return m_ix; }
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NON_CONST_REGISTOR_ACCESSOR(IX);
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[[nodiscard]] constexpr auto& IXH() noexcept { return IX().high; }
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[[nodiscard]] constexpr auto& IXL() noexcept { return IX().low; }
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[[nodiscard]] constexpr const auto& IY() const noexcept { return m_iy; }
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NON_CONST_REGISTOR_ACCESSOR(IY);
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[[nodiscard]] constexpr auto& IYH() noexcept { return IY().high; }
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[[nodiscard]] constexpr auto& IYL() noexcept { return IY().low; }
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// ** From the Z80 CPU User Manual
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// Memory Refresh(R) Register.The Z80 CPU contains a memory refresh counter,
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// enabling dynamic memories to be used with the same ease as static memories.Seven bits
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// of this 8-bit register are automatically incremented after each instruction fetch.The eighth
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// bit remains as programmed, resulting from an LD R, A instruction. The data in the refresh
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// counter is sent out on the lower portion of the address bus along with a refresh control
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// signal while the CPU is decoding and executing the fetched instruction. This mode of refresh
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// is transparent to the programmer and does not slow the CPU operation.The programmer
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// can load the R register for testing purposes, but this register is normally not used by the
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// programmer. During refresh, the contents of the I Register are placed on the upper eight
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// bits of the address bus.
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[[nodiscard]] constexpr auto& REFRESH() noexcept { return m_refresh; }
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[[nodiscard]] constexpr auto REFRESH() const noexcept { return m_refresh; }
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[[nodiscard]] constexpr auto& IV() noexcept { return iv; }
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[[nodiscard]] constexpr auto IV() const noexcept { return iv; }
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[[nodiscard]] constexpr auto& IM() noexcept { return m_interruptMode; }
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[[nodiscard]] constexpr auto IM() const noexcept { return m_interruptMode; }
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[[nodiscard]] constexpr auto& IFF1() noexcept { return m_iff1; }
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[[nodiscard]] constexpr auto IFF1() const noexcept { return m_iff1; }
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[[nodiscard]] constexpr auto& IFF2() noexcept { return m_iff2; }
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[[nodiscard]] constexpr auto IFF2() const noexcept { return m_iff2; }
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constexpr void exx() noexcept { m_registerSet ^= 1; }
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constexpr void exxAF() noexcept { m_accumulatorFlagsSet ^= 1; }
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[[nodiscard]] constexpr auto requestingIO() const noexcept { return lowered(IORQ()); }
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[[nodiscard]] constexpr auto requestingMemory() const noexcept { return lowered(MREQ()); }
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[[nodiscard]] constexpr auto requestingRead() const noexcept { return lowered(RD()); }
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[[nodiscard]] constexpr auto requestingWrite() const noexcept { return lowered(WR()); }
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protected:
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void handleRESET() noexcept final;
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void handleINT() noexcept final;
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void pushWord(register16_t destination) noexcept final;
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void memoryWrite() noexcept final;
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uint8_t memoryRead() noexcept final;
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void busWrite() noexcept final;
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uint8_t busRead() noexcept final;
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void jr(int8_t offset) noexcept final;
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int jrConditional(int condition) noexcept final;
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private:
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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 = 0;
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std::array<register16_t, 2> m_accumulatorFlags;
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int m_accumulatorFlagsSet = 0;
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register16_t m_ix = 0xffff;
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register16_t m_iy = 0xffff;
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refresh_t m_refresh = 0x7f;
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uint8_t iv = 0xff;
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int m_interruptMode = 0;
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bool m_iff1 = false;
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bool m_iff2 = false;
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bool m_prefixCB = false;
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bool m_prefixDD = false;
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bool m_prefixED = false;
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bool m_prefixFD = false;
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int8_t m_displacement = 0;
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void handleNMI() noexcept;
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constexpr void resetPrefixes() noexcept {
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m_prefixCB = m_prefixDD = m_prefixED = m_prefixFD = false;
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}
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[[nodiscard]] constexpr auto displaced() const noexcept { return m_prefixDD || m_prefixFD; }
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[[nodiscard]] constexpr uint16_t displacedAddress() noexcept {
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const auto address = (m_prefixDD ? IX() : IY()).word + m_displacement;
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MEMPTR().word = address;
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return address;
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}
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void fetchDisplacement() noexcept;
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[[nodiscard]] uint8_t fetchOpCode() noexcept;
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uint8_t readBusDataM1() noexcept;
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typedef std::function<register16_t(void)> addresser_t;
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void loadAccumulatorIndirect(addresser_t addresser) noexcept;
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void storeAccumulatorIndirect(addresser_t addresser) noexcept;
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typedef std::function<uint8_t(void)> reader_t;
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void readInternalRegister(reader_t reader) noexcept;
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[[nodiscard]] register16_t& HL2() noexcept;
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[[nodiscard]] register16_t& RP(int rp) noexcept;
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[[nodiscard]] register16_t& RP2(int rp) noexcept;
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[[nodiscard]] uint8_t R(int r) noexcept;
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void R(int r, uint8_t value) noexcept;
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void R2(int r, uint8_t value) noexcept;
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[[nodiscard]] static constexpr auto adjustHalfCarryAdd(uint8_t f, uint8_t before, uint8_t value, int calculation) noexcept {
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return setBit(f, HC, calculateHalfCarryAdd(before, value, calculation));
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}
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[[nodiscard]] static constexpr auto adjustHalfCarrySub(uint8_t f, uint8_t before, uint8_t value, int calculation) noexcept {
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return setBit(f, HC, calculateHalfCarrySub(before, value, calculation));
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}
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[[nodiscard]] static constexpr auto adjustOverflowAdd(uint8_t f, int beforeNegative, int valueNegative, int afterNegative) noexcept {
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const auto overflow = (beforeNegative == valueNegative) && (beforeNegative != afterNegative);
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return setBit(f, VF, overflow);
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}
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[[nodiscard]] static constexpr auto adjustOverflowAdd(uint8_t f, uint8_t before, uint8_t value, uint8_t calculation) noexcept {
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return adjustOverflowAdd(f, before & SF, value & SF, calculation & SF);
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}
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[[nodiscard]] static constexpr auto adjustOverflowSub(uint8_t f, int beforeNegative, int valueNegative, int afterNegative) noexcept {
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const auto overflow = (beforeNegative != valueNegative) && (beforeNegative != afterNegative);
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return setBit(f, VF, overflow);
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}
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[[nodiscard]] static constexpr auto adjustOverflowSub(uint8_t f, uint8_t before, uint8_t value, uint8_t calculation) noexcept {
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return adjustOverflowSub(f, before & SF, value & SF, calculation & SF);
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}
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[[nodiscard]] static constexpr bool convertCondition(uint8_t f, int flag) noexcept {
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switch (flag) {
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case 0:
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return !(f & ZF);
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case 1:
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return f & ZF;
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case 2:
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return !(f & CF);
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case 3:
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return f & CF;
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case 4:
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return !(f & PF);
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case 5:
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return f & PF;
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case 6:
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return !(f & SF);
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case 7:
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return f & SF;
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default:
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UNREACHABLE;
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}
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}
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static constexpr auto subtract(uint8_t& f, uint8_t operand, uint8_t value, int carry = 0) noexcept {
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const register16_t subtraction = operand - value - carry;
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const auto result = subtraction.low;
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f = adjustHalfCarrySub(f, operand, value, result);
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f = adjustOverflowSub(f, operand, value, result);
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f = setBit(f, NF);
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f = setBit(f, CF, subtraction.high & CF);
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f = adjustSZ<Z80>(f, result);
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return result;
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}
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void executeCB(int x, int y, int z) noexcept;
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void executeED(int x, int y, int z, int p, int q) noexcept;
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void executeOther(int x, int y, int z, int p, int q) noexcept;
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[[nodiscard]] static constexpr auto increment(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF);
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const uint8_t result = operand + 1;
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f = adjustSZXY<Z80>(f, result);
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f = setBit(f, VF, result == Bit7);
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f = clearBit(f, HC, lowNibble(result));
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return result;
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}
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[[nodiscard]] static constexpr auto decrement(uint8_t& f, uint8_t operand) noexcept {
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f = setBit(f, NF);
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f = clearBit(f, HC, lowNibble(operand));
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const uint8_t result = operand - 1;
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f = adjustSZXY<Z80>(f, result);
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f = setBit(f, VF, result == Mask7);
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return result;
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}
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void di() noexcept;
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void ei() noexcept;
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void retn() noexcept;
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void reti() noexcept;
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void returnConditionalFlag(uint8_t f, int flag) noexcept;
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void jrConditionalFlag(uint8_t f, int flag) noexcept;
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void callConditionalFlag(uint8_t f, int flag) noexcept;
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void jumpConditionalFlag(uint8_t f, int flag) noexcept;
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[[nodiscard]] register16_t sbc(uint8_t& f, register16_t operand, register16_t value) noexcept;
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[[nodiscard]] register16_t adc(uint8_t& f, register16_t operand, register16_t value) noexcept;
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[[nodiscard]] register16_t add(uint8_t& f, register16_t operand, register16_t value, int carry = 0) noexcept;
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[[nodiscard]] static constexpr auto add(uint8_t& f, uint8_t operand, uint8_t value, int carry = 0) noexcept {
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const register16_t addition = operand + value + carry;
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const auto result = addition.low;
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f = adjustHalfCarryAdd(f, operand, value, result);
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f = adjustOverflowAdd(f, operand, value, result);
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f = clearBit(f, NF);
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f = setBit(f, CF, addition.high & CF);
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f = adjustSZXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto adc(uint8_t& f, uint8_t operand, uint8_t value) noexcept {
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return add(f, operand, value, f & CF);
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}
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[[nodiscard]] static constexpr auto sub(uint8_t& f, uint8_t operand, uint8_t value, int carry = 0) noexcept {
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const auto subtraction = subtract(f, operand, value, carry);
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f = adjustSZXY<Z80>(f, subtraction);
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return subtraction;
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}
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[[nodiscard]] static constexpr auto sbc(uint8_t& f, uint8_t operand, uint8_t value) noexcept {
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return sub(f, operand, value, f & CF);
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}
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[[nodiscard]] static constexpr auto andr(uint8_t& f, uint8_t operand, uint8_t value) noexcept {
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f = setBit(f, HC);
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f = clearBit(f, CF | NF);
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const uint8_t result = operand & value;
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f = adjustSZPXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto xorr(uint8_t& f, uint8_t operand, uint8_t value) noexcept {
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f = clearBit(f, HC | CF | NF);
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const uint8_t result = operand ^ value;
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f = adjustSZPXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto orr(uint8_t& f, uint8_t operand, uint8_t value) noexcept {
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f = clearBit(f, HC | CF | NF);
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const uint8_t result = operand | value;
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f = adjustSZPXY<Z80>(f, result);
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return result;
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}
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static void compare(uint8_t& f, uint8_t operand, uint8_t value) noexcept {
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subtract(f, operand, value);
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f = adjustXY<Z80>(f, value);
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}
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[[nodiscard]] static constexpr auto rlc(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF | HC);
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const auto carry = operand & Bit7;
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f = setBit(f, CF, carry);
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const uint8_t result = (operand << 1) | (carry >> 7);
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f = adjustXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto rrc(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF | HC);
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const auto carry = operand & Bit0;
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f = setBit(f, CF, carry);
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const uint8_t result = (operand >> 1) | (carry << 7);
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f = adjustXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto rl(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF | HC);
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const auto carry = f & CF;
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f = setBit(f, CF, operand & Bit7);
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const uint8_t result = (operand << 1) | carry;
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f = adjustXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto rr(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF | HC);
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const auto carry = f & CF;
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f = setBit(f, CF, operand & Bit0);
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const uint8_t result = (operand >> 1) | (carry << 7);
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f = adjustXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto sla(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF | HC);
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f = setBit(f, CF, operand & Bit7);
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const uint8_t result = operand << 1;
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f = adjustXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto sra(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF | HC);
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f = setBit(f, CF, operand & Bit0);
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const uint8_t result = (operand >> 1) | (operand & Bit7);
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f = adjustXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto sll(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF | HC);
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f = setBit(f, CF, operand & Bit7);
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const uint8_t result = (operand << 1) | Bit0;
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f = adjustXY<Z80>(f, result);
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return result;
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}
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[[nodiscard]] static constexpr auto srl(uint8_t& f, uint8_t operand) noexcept {
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f = clearBit(f, NF | HC);
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f = setBit(f, CF, operand & Bit0);
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const uint8_t result = (operand >> 1) & ~Bit7;
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f = adjustXY<Z80>(f, result);
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f = setBit(f, ZF, result);
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return result;
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}
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static constexpr void bit(uint8_t& f, int n, uint8_t operand) noexcept {
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f = setBit(f, HC);
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f = clearBit(f, NF);
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const auto discarded = operand & Chip::bit(n);
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f = adjustSZ<Z80>(f, discarded);
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f = clearBit(f, PF, discarded);
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}
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[[nodiscard]] static constexpr auto res(int n, uint8_t operand) noexcept { return clearBit(operand, Chip::bit(n)); }
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[[nodiscard]] static constexpr auto set(int n, uint8_t operand) noexcept { return setBit(operand, Chip::bit(n)); }
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[[nodiscard]] static constexpr auto daa(uint8_t& f, uint8_t operand) noexcept {
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const auto lowAdjust = (f & HC) || (lowNibble(operand) > 9);
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const auto highAdjust = (f & CF) || (operand > 0x99);
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auto updated = operand;
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if (f & NF) {
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if (lowAdjust)
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updated -= 6;
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if (highAdjust)
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updated -= 0x60;
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} else {
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if (lowAdjust)
|
||
updated += 6;
|
||
if (highAdjust)
|
||
updated += 0x60;
|
||
}
|
||
|
||
f = (f & (CF | NF)) | (operand > 0x99 ? CF : 0) | ((operand ^ updated) & HC);
|
||
|
||
f = adjustSZPXY<Z80>(f, updated);
|
||
|
||
return updated;
|
||
}
|
||
|
||
static constexpr void scf(uint8_t& f, uint8_t operand) noexcept {
|
||
f = setBit(f, CF);
|
||
f = clearBit(f, HC | NF);
|
||
f = adjustXY<Z80>(f, operand);
|
||
}
|
||
|
||
static constexpr void ccf(uint8_t& f, uint8_t operand) noexcept {
|
||
f = clearBit(f, NF);
|
||
const auto carry = f & CF;
|
||
f = setBit(f, HC, carry);
|
||
f = clearBit(f, CF, carry);
|
||
f = adjustXY<Z80>(f, operand);
|
||
}
|
||
|
||
[[nodiscard]] static constexpr auto cpl(uint8_t& f, uint8_t operand) noexcept {
|
||
f = setBit(f, HC | NF);
|
||
const uint8_t result = ~operand;
|
||
f = adjustXY<Z80>(f, result);
|
||
return result;
|
||
}
|
||
|
||
void xhtl(register16_t& exchange) noexcept;
|
||
|
||
void blockCompare(uint8_t& f, uint8_t value, register16_t source, register16_t& counter) noexcept;
|
||
|
||
void cpi(uint8_t& f, uint8_t value) noexcept;
|
||
[[nodiscard]] bool cpir(uint8_t& f, uint8_t value) noexcept;
|
||
|
||
void cpd(uint8_t& f, uint8_t value) noexcept;
|
||
[[nodiscard]] bool cpdr(uint8_t& f, uint8_t value) noexcept;
|
||
|
||
void blockLoad(uint8_t& f, uint8_t a, register16_t source, register16_t destination, register16_t& counter) noexcept;
|
||
|
||
void ldi(uint8_t& f, uint8_t a) noexcept;
|
||
[[nodiscard]] bool ldir(uint8_t& f, uint8_t a) noexcept;
|
||
|
||
void ldd(uint8_t& f, uint8_t a) noexcept;
|
||
[[nodiscard]] bool lddr(uint8_t& f, uint8_t a) noexcept;
|
||
|
||
void blockIn(register16_t& source, register16_t destination) noexcept;
|
||
|
||
void ini() noexcept;
|
||
[[nodiscard]] bool inir() noexcept;
|
||
|
||
void ind() noexcept;
|
||
[[nodiscard]] bool indr() noexcept;
|
||
|
||
void blockOut(register16_t source, register16_t& destination) noexcept;
|
||
|
||
void outi() noexcept;
|
||
[[nodiscard]] bool otir() noexcept;
|
||
|
||
void outd() noexcept;
|
||
[[nodiscard]] bool otdr() noexcept;
|
||
|
||
[[nodiscard]] static constexpr auto neg(uint8_t& f, uint8_t operand) noexcept {
|
||
f = setBit(f, PF, operand == Bit7);
|
||
f = setBit(f, CF, operand);
|
||
f = setBit(f, NF);
|
||
|
||
const uint8_t result = (~operand + 1); // two's complement
|
||
|
||
f = adjustHalfCarrySub(f, 0U, operand, result);
|
||
f = adjustOverflowSub(f, 0U, operand, result);
|
||
|
||
f = adjustSZXY<Z80>(f, result);
|
||
|
||
return result;
|
||
}
|
||
|
||
void rrd(uint8_t& f, register16_t address, uint8_t& update) noexcept;
|
||
void rld(uint8_t& f, register16_t address, uint8_t& update) noexcept;
|
||
|
||
void portWrite(uint8_t port) noexcept;
|
||
void portWrite() noexcept;
|
||
|
||
uint8_t portRead(uint8_t port) noexcept;
|
||
uint8_t portRead() noexcept;
|
||
};
|
||
} |