mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2024-09-01 00:28:55 +00:00
538 lines
11 KiB
C++
538 lines
11 KiB
C++
#pragma once
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// Auxiliary carry logic from https://github.com/begoon/i8080-core
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#include "IntelProcessor.h"
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#include "InputOutput.h"
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namespace EightBit {
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class Intel8080 : public IntelProcessor {
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public:
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typedef std::function<void()> instruction_t;
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enum StatusBits {
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SF = Bit7,
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ZF = Bit6,
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AC = Bit4,
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PF = Bit2,
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CF = Bit0,
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};
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enum AddressingMode {
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Unknown,
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Implied, // zero bytes
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Immediate, // single byte
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Absolute // two bytes, little endian
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};
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struct Instruction {
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instruction_t vector = nullptr;
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AddressingMode mode = Unknown;
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std::string disassembly;
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int count = 0;
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};
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Intel8080(Memory& memory, InputOutput& ports);
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Signal<Intel8080> ExecutingInstruction;
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const std::array<Instruction, 0x100>& getInstructions() const { return instructions; }
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virtual register16_t& AF() override { return af; }
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virtual register16_t& BC() override { return bc; }
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virtual register16_t& DE() override { return de; }
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virtual register16_t& HL() override { return hl; }
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bool isInterruptable() const;
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int interrupt(uint8_t value);
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virtual void initialise();
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int step();
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private:
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InputOutput& m_ports;
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std::array<Instruction, 0x100> instructions;
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register16_t af;
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register16_t bc;
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register16_t de;
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register16_t hl;
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bool m_interrupt;
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int execute(uint8_t opcode);
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int execute(const Instruction& instruction);
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void adjustReservedFlags() {
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F() = (F() | Bit1) & ~(Bit5 | Bit3);
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}
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static void adjustAuxiliaryCarryAdd(uint8_t& f, uint8_t before, uint8_t value, int calculation) {
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setFlag(f, AC, calculateHalfCarryAdd(before, value, calculation));
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}
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static void adjustAuxiliaryCarrySub(uint8_t& f, uint8_t before, uint8_t value, int calculation) {
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clearFlag(f, AC, calculateHalfCarrySub(before, value, calculation));
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}
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static void increment(uint8_t& f, uint8_t& operand);
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static void decrement(uint8_t& f, uint8_t& operand);
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static Instruction INS(instruction_t method, AddressingMode mode, std::string disassembly, int cycles);
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Instruction UNKNOWN();
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void installInstructions();
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//
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void compare(uint8_t& f, uint8_t check, uint8_t value);
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void anda(uint8_t value);
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void ora(uint8_t value);
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void xra(uint8_t value);
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void add(uint8_t value, int carry = 0);
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void adc(uint8_t value);
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void dad(uint16_t value);
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void subtract(uint8_t& f, uint8_t& operand, uint8_t value, int carry = 0);
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void sbb(uint8_t value);
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void mov_m_r(uint8_t value) {
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m_memory.ADDRESS() = HL();
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m_memory.reference() = value;
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}
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uint8_t mov_r_m() {
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m_memory.ADDRESS() = HL();
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return m_memory.reference();
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}
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//
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void ___();
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// Move, load, and store
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void mov_a_a() { }
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void mov_a_b() { A() = B(); }
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void mov_a_c() { A() = C(); }
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void mov_a_d() { A() = D(); }
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void mov_a_e() { A() = E(); }
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void mov_a_h() { A() = H(); }
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void mov_a_l() { A() = L(); }
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void mov_b_a() { B() = A(); }
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void mov_b_b() { }
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void mov_b_c() { B() = C(); }
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void mov_b_d() { B() = D(); }
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void mov_b_e() { B() = E(); }
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void mov_b_h() { B() = H(); }
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void mov_b_l() { B() = L(); }
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void mov_c_a() { C() = A(); }
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void mov_c_b() { C() = B(); }
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void mov_c_c() { }
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void mov_c_d() { C() = D(); }
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void mov_c_e() { C() = E(); }
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void mov_c_h() { C() = H(); }
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void mov_c_l() { C() = L(); }
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void mov_d_a() { D() = A(); }
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void mov_d_b() { D() = B(); }
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void mov_d_c() { D() = C(); }
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void mov_d_d() { }
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void mov_d_e() { D() = E(); }
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void mov_d_h() { D() = H(); }
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void mov_d_l() { D() = L(); }
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void mov_e_a() { E() = A(); }
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void mov_e_b() { E() = B(); }
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void mov_e_c() { E() = C(); }
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void mov_e_d() { E() = D(); }
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void mov_e_e() { }
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void mov_e_h() { E() = H(); }
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void mov_e_l() { E() = L(); }
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void mov_h_a() { H() = A(); }
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void mov_h_b() { H() = B(); }
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void mov_h_c() { H() = C(); }
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void mov_h_d() { H() = D(); }
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void mov_h_e() { H() = E(); }
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void mov_h_h() { }
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void mov_h_l() { H() = L(); }
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void mov_l_a() { L() = A(); }
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void mov_l_b() { L() = B(); }
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void mov_l_c() { L() = C(); }
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void mov_l_d() { L() = D(); }
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void mov_l_e() { L() = E(); }
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void mov_l_h() { L() = H(); }
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void mov_l_l() { }
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void mov_m_a() { mov_m_r(A()); }
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void mov_m_b() { mov_m_r(B()); }
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void mov_m_c() { mov_m_r(C()); }
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void mov_m_d() { mov_m_r(D()); }
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void mov_m_e() { mov_m_r(E()); }
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void mov_m_h() { mov_m_r(H()); }
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void mov_m_l() { mov_m_r(L()); }
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void mov_a_m() { A() = mov_r_m(); }
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void mov_b_m() { B() = mov_r_m(); }
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void mov_c_m() { C() = mov_r_m(); }
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void mov_d_m() { D() = mov_r_m(); }
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void mov_e_m() { E() = mov_r_m(); }
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void mov_h_m() { H() = mov_r_m(); }
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void mov_l_m() { L() = mov_r_m(); }
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void mvi_a() { A() = fetchByte(); }
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void mvi_b() { B() = fetchByte(); }
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void mvi_c() { C() = fetchByte(); }
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void mvi_d() { D() = fetchByte(); }
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void mvi_e() { E() = fetchByte(); }
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void mvi_h() { H() = fetchByte(); }
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void mvi_l() { L() = fetchByte(); }
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void mvi_m() {
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auto data = fetchByte();
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m_memory.ADDRESS() = HL();
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m_memory.reference() = data;
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}
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void lxi_b() { fetchWord(BC()); }
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void lxi_d() { fetchWord(DE()); }
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void lxi_h() { fetchWord(HL()); }
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void stax_r(register16_t& destination) {
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m_memory.ADDRESS() = destination;
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m_memory.reference() = A();
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}
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void stax_b() { stax_r(BC()); }
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void stax_d() { stax_r(DE()); }
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void ldax_r(register16_t& source) {
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m_memory.ADDRESS() = source;
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A() = m_memory.reference();
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}
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void ldax_b() { ldax_r(BC()); }
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void ldax_d() { ldax_r(DE()); }
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void sta() {
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fetchWord();
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memptrReference() = A();
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}
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void lda() {
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fetchWord();
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A() = memptrReference();
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}
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void shld() {
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fetchWord();
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setWordViaMemptr(HL());
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}
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void lhld() {
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fetchWord();
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getWordViaMemptr(HL());
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}
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void xchg() {
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std::swap(DE(), HL());
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}
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// stack ops
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void push_b() { pushWord(BC()); }
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void push_d() { pushWord(DE()); }
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void push_h() { pushWord(HL()); }
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void push_psw() { pushWord(AF()); }
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void pop_b() { popWord(BC()); }
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void pop_d() { popWord(DE()); }
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void pop_h() { popWord(HL()); }
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void pop_psw() {
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popWord(AF());
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adjustReservedFlags();
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}
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void xhtl();
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void sphl() {
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SP() = HL();
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}
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void lxi_sp() {
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fetchWord(SP());
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}
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void inx_sp() { ++SP().word; }
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void dcx_sp() { --SP().word; }
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// jump
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void jmp();
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void jc();
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void jnc();
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void jz();
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void jnz();
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void jpe();
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void jpo();
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void jm();
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void jp();
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void pchl();
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// call
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void callDirect();
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void cc();
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void cnc();
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void cpe();
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void cpo();
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void cz();
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void cnz();
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void cm();
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void cp();
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// return
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void rc();
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void rnc();
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void rz();
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void rnz();
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void rpe();
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void rpo();
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void rm();
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void rp();
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// restart
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void rst_0() { restart(0 << 3); }
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void rst_1() { restart(1 << 3); }
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void rst_2() { restart(2 << 3); }
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void rst_3() { restart(3 << 3); }
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void rst_4() { restart(4 << 3); }
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void rst_5() { restart(5 << 3); }
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void rst_6() { restart(6 << 3); }
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void rst_7() { restart(7 << 3); }
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// increment and decrement
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void inr_a() { increment(F(), A()); }
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void inr_b() { increment(F(), B()); }
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void inr_c() { increment(F(), C()); }
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void inr_d() { increment(F(), D()); }
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void inr_e() { increment(F(), E()); }
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void inr_h() { increment(F(), H()); }
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void inr_l() { increment(F(), L()); }
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void inr_m() {
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m_memory.ADDRESS() = HL();
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increment(F(), m_memory.reference());
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}
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void dcr_a() { decrement(F(), A()); }
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void dcr_b() { decrement(F(), B()); }
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void dcr_c() { decrement(F(), C()); }
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void dcr_d() { decrement(F(), D()); }
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void dcr_e() { decrement(F(), E()); }
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void dcr_h() { decrement(F(), H()); }
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void dcr_l() { decrement(F(), L()); }
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void dcr_m() {
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m_memory.ADDRESS() = HL();
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decrement(F(), m_memory.reference());
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}
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void inx_b() { ++BC().word; }
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void inx_d() { ++DE().word; }
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void inx_h() { ++HL().word; }
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void dcx_b() { --BC().word; }
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void dcx_d() { --DE().word; }
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void dcx_h() { --HL().word; }
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// add
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void add_a() { add(A()); }
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void add_b() { add(B()); }
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void add_c() { add(C()); }
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void add_d() { add(D()); }
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void add_e() { add(E()); }
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void add_h() { add(H()); }
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void add_l() { add(L()); }
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void add_m() {
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m_memory.ADDRESS() = HL();
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add(m_memory.reference());
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}
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void adi() { add(fetchByte()); }
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void adc_a() { adc(A()); }
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void adc_b() { adc(B()); }
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void adc_c() { adc(C()); }
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void adc_d() { adc(D()); }
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void adc_e() { adc(E()); }
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void adc_h() { adc(H()); }
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void adc_l() { adc(L()); }
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void adc_m() {
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m_memory.ADDRESS() = HL();
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adc(m_memory.reference());
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}
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void aci() { adc(fetchByte()); }
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void dad_b() { dad(BC().word); }
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void dad_d() { dad(DE().word); }
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void dad_h() { dad(HL().word); }
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void dad_sp() { dad(SP().word); }
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// subtract
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void sub_a() { subtract(F(), A(), A()); }
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void sub_b() { subtract(F(), A(), B()); }
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void sub_c() { subtract(F(), A(), C()); }
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void sub_d() { subtract(F(), A(), D()); }
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void sub_e() { subtract(F(), A(), E()); }
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void sub_h() { subtract(F(), A(), H()); }
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void sub_l() { subtract(F(), A(), L()); }
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void sub_m() {
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m_memory.ADDRESS() = HL();
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subtract(F(), A(), m_memory.reference());
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}
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void sbb_a() { sbb(A()); }
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void sbb_b() { sbb(B()); }
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void sbb_c() { sbb(C()); }
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void sbb_d() { sbb(D()); }
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void sbb_e() { sbb(E()); }
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void sbb_h() { sbb(H()); }
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void sbb_l() { sbb(L()); }
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void sbb_m() {
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m_memory.ADDRESS() = HL();
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sbb(m_memory.reference());
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}
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void sbi() {
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sbb(fetchByte());
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}
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void sui() {
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subtract(F(), A(), fetchByte());
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}
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// logical
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void ana_a() { anda(A()); }
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void ana_b() { anda(B()); }
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void ana_c() { anda(C()); }
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void ana_d() { anda(D()); }
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void ana_e() { anda(E()); }
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void ana_h() { anda(H()); }
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void ana_l() { anda(L()); }
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void ana_m() {
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m_memory.ADDRESS() = HL();
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anda(m_memory.reference());
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}
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void ani() { anda(fetchByte()); }
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void xra_a() { xra(A()); }
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void xra_b() { xra(B()); }
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void xra_c() { xra(C()); }
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void xra_d() { xra(D()); }
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void xra_e() { xra(E()); }
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void xra_h() { xra(H()); }
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void xra_l() { xra(L()); }
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void xra_m() {
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m_memory.ADDRESS() = HL();
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xra(m_memory.reference());
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}
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void xri() { xra(fetchByte()); }
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void ora_a() { ora(A()); }
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void ora_b() { ora(B()); }
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void ora_c() { ora(C()); }
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void ora_d() { ora(D()); }
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void ora_e() { ora(E()); }
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void ora_h() { ora(H()); }
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void ora_l() { ora(L()); }
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void ora_m() {
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m_memory.ADDRESS() = HL();
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ora(m_memory.reference());
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}
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void ori() { ora(fetchByte()); }
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void cmp_a() { compare(F(), A(), A()); }
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void cmp_b() { compare(F(), A(), B()); }
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void cmp_c() { compare(F(), A(), C()); }
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void cmp_d() { compare(F(), A(), D()); }
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void cmp_e() { compare(F(), A(), E()); }
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void cmp_h() { compare(F(), A(), H()); }
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void cmp_l() { compare(F(), A(), L()); }
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void cmp_m() {
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m_memory.ADDRESS() = HL();
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compare(F(), A(), m_memory.reference());
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}
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void cpi() { compare(F(), A(), fetchByte()); }
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// rotate
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void rlc();
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void rrc();
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void ral();
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void rar();
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// specials
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void cma();
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void stc();
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void cmc();
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void daa();
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// input/output
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void out();
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void in();
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// control
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void ei();
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void di();
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void nop() {}
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void hlt() { halt(); }
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};
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} |