mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2024-12-22 09:30:32 +00:00
A few modifications:
1) Simplify REFRESH register handling via bit fields. 2) Use static methods in the Z80 emulator, if at all possible 3) Use a decoded opcode lookup, rather than decoding per instruction Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon
parent
d22b695682
commit
c803387023
@ -45,7 +45,7 @@ void Fuse::TestRunner::initialiseRegisters() {
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m_cpu.MEMPTR() = inputRegisters[Fuse::RegisterState::MEMPTR];
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m_cpu.IV() = testState.i;
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m_cpu.REFRESH() = testState.r;
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m_cpu.REFRESH() = EightBit::Z80::refresh_t::fromUint8(testState.r);
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m_cpu.IFF1() = testState.iff1;
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m_cpu.IFF2() = testState.iff2;
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m_cpu.IM() = testState.im;
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@ -121,7 +121,7 @@ void Fuse::TestRunner::checkregisters() {
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auto memptr = m_cpu.MEMPTR().word == expectedRegisters[Fuse::RegisterState::MEMPTR].word;
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auto iv = m_cpu.IV() == expectedState.i;
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auto refresh = m_cpu.REFRESH() == expectedState.r;
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auto refresh = m_cpu.REFRESH().asUint8() == expectedState.r;
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auto iff1 = m_cpu.IFF1() == expectedState.iff1;
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auto iff2 = m_cpu.IFF2() == expectedState.iff2;
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auto im = m_cpu.IM() == expectedState.im;
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@ -263,7 +263,7 @@ void Fuse::TestRunner::checkregisters() {
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<< "**** R, Expected: "
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<< EightBit::Disassembler::hex((uint8_t)expectedState.r)
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<< ", Got: "
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<< EightBit::Disassembler::hex(m_cpu.REFRESH())
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<< EightBit::Disassembler::hex(m_cpu.REFRESH().variable)
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<< std::endl;
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}
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105
Z80/inc/Z80.h
105
Z80/inc/Z80.h
@ -9,6 +9,42 @@
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namespace EightBit {
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class Z80 : public IntelProcessor {
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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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uint8_t asUint8() const {
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return (high << 7) | variable;
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}
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static refresh_t fromUint8(uint8_t value) {
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refresh_t returned;
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returned.high = (value & Bit7) != 0;
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returned.variable = value & Mask7;
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return returned;
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}
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};
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struct opcode_decoded_t {
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int x;
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int y;
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int z;
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int p;
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int q;
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static opcode_decoded_t decode(uint8_t opcode) {
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opcode_decoded_t returned;
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returned.x = (opcode & 0b11000000) >> 6;
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returned.y = (opcode & 0b00111000) >> 3;
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returned.z = (opcode & 0b00000111);
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returned.p = (returned.y & 0b110) >> 1;
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returned.q = (returned.y & 1);
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return returned;
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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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@ -63,7 +99,7 @@ namespace EightBit {
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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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refresh_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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@ -96,7 +132,8 @@ namespace EightBit {
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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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refresh_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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@ -112,13 +149,15 @@ namespace EightBit {
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int8_t m_displacement;
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bool m_displaced;
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std::array<opcode_decoded_t, 0x100> m_decodedOpcodes;
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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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REFRESH().variable++;
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}
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uint8_t& DISPLACED() {
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@ -191,8 +230,8 @@ namespace EightBit {
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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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// Must be FD prefix
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return IY();
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}
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return HL();
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}
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@ -249,47 +288,49 @@ namespace EightBit {
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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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static void subtract(uint8_t& f, uint8_t& operand, uint8_t value, int carry = 0);
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void executeCB(int x, int y, int z);
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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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void postIncrement(uint8_t& f, uint8_t value);
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void postDecrement(uint8_t& f, uint8_t value);
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static void postIncrement(uint8_t& f, uint8_t value);
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static 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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bool jrConditionalFlag(uint8_t& f, int flag);
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bool returnConditionalFlag(uint8_t& f, int flag);
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bool jumpConditionalFlag(uint8_t& f, int flag);
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bool callConditionalFlag(uint8_t& f, 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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static void add(uint8_t& f, 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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static void sub(uint8_t& f, 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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static void andr(uint8_t& f, uint8_t& operand, uint8_t value);
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static void xorr(uint8_t& f, uint8_t& operand, uint8_t value);
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static void orr(uint8_t& f, uint8_t& operand, uint8_t value);
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static void compare(uint8_t& f, uint8_t check, 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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static uint8_t& rlc(uint8_t& f, uint8_t& operand);
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static uint8_t& rrc(uint8_t& f, uint8_t& operand);
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static uint8_t& rl(uint8_t& f, uint8_t& operand);
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static uint8_t& rr(uint8_t& f, uint8_t& operand);
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static uint8_t& sla(uint8_t& f, uint8_t& operand);
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static uint8_t& sra(uint8_t& f, uint8_t& operand);
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static uint8_t& sll(uint8_t& f, uint8_t& operand);
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static uint8_t& srl(uint8_t& f, 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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static uint8_t& bit(uint8_t& f, int n, uint8_t& operand);
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static uint8_t& res(int n, uint8_t& operand);
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static uint8_t& set(int nit, uint8_t& operand);
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void daa();
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@ -300,12 +341,12 @@ namespace EightBit {
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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 blockCompare(uint8_t a, uint8_t& f);
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void cpi();
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void cpi(uint8_t a, uint8_t& f);
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bool cpir();
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void cpd();
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void cpd(uint8_t a, uint8_t& f);
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bool cpdr();
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void blockLoad(register16_t source, register16_t destination);
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@ -31,7 +31,7 @@ std::string EightBit::Disassembler::state(Z80& cpu) {
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auto l = cpu.L();
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auto i = cpu.IV();
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auto r = cpu.REFRESH();
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auto r = cpu.REFRESH().asUint8();
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auto im = cpu.IM();
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329
Z80/src/Z80.cpp
329
Z80/src/Z80.cpp
@ -9,7 +9,6 @@ EightBit::Z80::Z80(Memory& memory, InputOutput& ports)
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m_ports(ports),
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m_registerSet(0),
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m_accumulatorFlagsSet(0),
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m_refresh(0x7f),
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iv(0xff),
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m_interruptMode(0),
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m_iff1(false),
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@ -21,8 +20,11 @@ EightBit::Z80::Z80(Memory& memory, InputOutput& ports)
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m_prefixFD(false),
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m_displacement(0),
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m_displaced(false) {
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IX().word = 0xffff;
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IY().word = 0xffff;
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REFRESH() = refresh_t::fromUint8(0x7f);
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}
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void EightBit::Z80::reset() {
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@ -34,6 +36,10 @@ void EightBit::Z80::initialise() {
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IntelProcessor::initialise();
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for (int i = 0; i < 0x100; ++i) {
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m_decodedOpcodes[i] = opcode_decoded_t::decode(i);
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}
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IM() = 0;
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AF().word = 0xffff;
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@ -54,7 +60,7 @@ void EightBit::Z80::initialise() {
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IX().word = 0xffff;
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IY().word = 0xffff;
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REFRESH() = 0x7f;
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REFRESH() = refresh_t::fromUint8(0x7f);
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IV() = 0xff;
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m_prefixCB = false;
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@ -126,46 +132,46 @@ void EightBit::Z80::postDecrement(uint8_t& f, uint8_t value) {
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#pragma region PC manipulation: call/ret/jp/jr
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bool EightBit::Z80::jrConditionalFlag(int flag) {
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bool EightBit::Z80::jrConditionalFlag(uint8_t& f, int flag) {
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switch (flag) {
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case 0: // NZ
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return jrConditional(!(F() & ZF));
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return jrConditional(!(f & ZF));
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case 1: // Z
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return jrConditional(F() & ZF);
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return jrConditional(f & ZF);
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case 2: // NC
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return jrConditional(!(F() & CF));
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return jrConditional(!(f & CF));
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case 3: // C
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return jrConditional(F() & CF);
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return jrConditional(f & CF);
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case 4: // PO
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return jrConditional(!(F() & PF));
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return jrConditional(!(f & PF));
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case 5: // PE
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return jrConditional(F() & PF);
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return jrConditional(f & PF);
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case 6: // P
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return jrConditional(!(F() & SF));
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return jrConditional(!(f & SF));
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case 7: // M
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return jrConditional(F() & SF);
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return jrConditional(f & SF);
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}
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throw std::logic_error("Unhandled JR conditional");
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}
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bool EightBit::Z80::jumpConditionalFlag(int flag) {
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bool EightBit::Z80::jumpConditionalFlag(uint8_t& f, int flag) {
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switch (flag) {
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case 0: // NZ
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return jumpConditional(!(F() & ZF));
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return jumpConditional(!(f & ZF));
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case 1: // Z
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return jumpConditional(F() & ZF);
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return jumpConditional(f & ZF);
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case 2: // NC
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return jumpConditional(!(F() & CF));
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return jumpConditional(!(f & CF));
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case 3: // C
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return jumpConditional(F() & CF);
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return jumpConditional(f & CF);
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case 4: // PO
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return jumpConditional(!(F() & PF));
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return jumpConditional(!(f & PF));
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case 5: // PE
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return jumpConditional(F() & PF);
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return jumpConditional(f & PF);
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case 6: // P
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return jumpConditional(!(F() & SF));
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return jumpConditional(!(f & SF));
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case 7: // M
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return jumpConditional(F() & SF);
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return jumpConditional(f & SF);
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}
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throw std::logic_error("Unhandled JP conditional");
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}
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@ -179,46 +185,46 @@ void EightBit::Z80::reti() {
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retn();
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}
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bool EightBit::Z80::returnConditionalFlag(int flag) {
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bool EightBit::Z80::returnConditionalFlag(uint8_t& f, int flag) {
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switch (flag) {
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case 0: // NZ
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return returnConditional(!(F() & ZF));
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return returnConditional(!(f & ZF));
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case 1: // Z
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return returnConditional(F() & ZF);
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return returnConditional(f & ZF);
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case 2: // NC
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return returnConditional(!(F() & CF));
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return returnConditional(!(f & CF));
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case 3: // C
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return returnConditional(F() & CF);
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return returnConditional(f & CF);
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case 4: // PO
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return returnConditional(!(F() & PF));
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return returnConditional(!(f & PF));
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case 5: // PE
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return returnConditional(F() & PF);
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return returnConditional(f & PF);
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case 6: // P
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return returnConditional(!(F() & SF));
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return returnConditional(!(f & SF));
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case 7: // M
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return returnConditional(F() & SF);
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return returnConditional(f & SF);
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}
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throw std::logic_error("Unhandled RET conditional");
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}
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bool EightBit::Z80::callConditionalFlag(int flag) {
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bool EightBit::Z80::callConditionalFlag(uint8_t& f, int flag) {
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switch (flag) {
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case 0: // NZ
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return callConditional(!(F() & ZF));
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return callConditional(!(f & ZF));
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case 1: // Z
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return callConditional(F() & ZF);
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return callConditional(f & ZF);
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case 2: // NC
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return callConditional(!(F() & CF));
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return callConditional(!(f & CF));
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case 3: // C
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return callConditional(F() & CF);
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return callConditional(f & CF);
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case 4: // PO
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return callConditional(!(F() & PF));
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return callConditional(!(f & PF));
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case 5: // PE
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return callConditional(F() & PF);
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return callConditional(f & PF);
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case 6: // P
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return callConditional(!(F() & SF));
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return callConditional(!(f & SF));
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case 7: // M
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return callConditional(F() & SF);
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return callConditional(f & SF);
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}
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throw std::logic_error("Unhandled CALL conditional");
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}
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@ -231,15 +237,15 @@ void EightBit::Z80::sbc(register16_t& operand, register16_t value) {
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auto& f = F();
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auto before = operand;
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const auto before = operand;
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auto beforeNegative = before.high & SF;
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auto valueNegative = value.high & SF;
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const auto beforeNegative = before.high & SF;
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const auto valueNegative = value.high & SF;
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auto result = before.word - value.word - (f & CF);
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const auto result = before.word - value.word - (f & CF);
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operand.word = result;
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auto afterNegative = operand.high & SF;
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const auto afterNegative = operand.high & SF;
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setFlag(f, SF, afterNegative);
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clearFlag(f, ZF, operand.word);
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@ -254,18 +260,18 @@ void EightBit::Z80::adc(register16_t& operand, register16_t value) {
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auto& f = F();
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auto before = operand;
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const auto before = operand;
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auto beforeNegative = before.high & SF;
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auto valueNegative = value.high & SF;
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const auto beforeNegative = before.high & SF;
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const auto valueNegative = value.high & SF;
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auto result = before.word + value.word + (f & CF);
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const auto result = before.word + value.word + (f & CF);
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operand.word = result;
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auto afterNegative = operand.high & SF;
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setFlag(f, SF, afterNegative);
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clearFlag(f, ZF, result);
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clearFlag(f, ZF, operand.word);
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adjustHalfCarryAdd(f, before.high, value.high, operand.high);
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adjustOverflowAdd(f, beforeNegative, valueNegative, afterNegative);
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clearFlag(f, NF);
|
||||
@ -277,9 +283,9 @@ void EightBit::Z80::add(register16_t& operand, register16_t value) {
|
||||
|
||||
auto& f = F();
|
||||
|
||||
auto before = operand;
|
||||
const auto before = operand;
|
||||
|
||||
auto result = before.word + value.word;
|
||||
const auto result = before.word + value.word;
|
||||
|
||||
operand.word = result;
|
||||
|
||||
@ -293,9 +299,7 @@ void EightBit::Z80::add(register16_t& operand, register16_t value) {
|
||||
|
||||
#pragma region ALU
|
||||
|
||||
void EightBit::Z80::add(uint8_t& operand, uint8_t value, int carry) {
|
||||
|
||||
auto& f = F();
|
||||
void EightBit::Z80::add(uint8_t& f, uint8_t& operand, uint8_t value, int carry) {
|
||||
|
||||
register16_t result;
|
||||
result.word = operand + value + carry;
|
||||
@ -311,12 +315,11 @@ void EightBit::Z80::add(uint8_t& operand, uint8_t value, int carry) {
|
||||
}
|
||||
|
||||
void EightBit::Z80::adc(uint8_t& operand, uint8_t value) {
|
||||
add(operand, value, F() & CF);
|
||||
auto& f = F();
|
||||
add(f, operand, value, f & CF);
|
||||
}
|
||||
|
||||
void EightBit::Z80::sub(uint8_t& operand, uint8_t value, int carry) {
|
||||
|
||||
auto& f = F();
|
||||
void EightBit::Z80::subtract(uint8_t& f, uint8_t& operand, uint8_t value, int carry) {
|
||||
|
||||
register16_t result;
|
||||
result.word = operand - value - carry;
|
||||
@ -328,71 +331,68 @@ void EightBit::Z80::sub(uint8_t& operand, uint8_t value, int carry) {
|
||||
|
||||
setFlag(f, NF);
|
||||
setFlag(f, CF, result.word & Bit8);
|
||||
adjustSZXY<Z80>(f, operand);
|
||||
adjustSZ<Z80>(f, operand);
|
||||
}
|
||||
|
||||
void EightBit::Z80::sub(uint8_t& f, uint8_t& operand, uint8_t value, int carry) {
|
||||
subtract(f, operand, value, carry);
|
||||
adjustXY<Z80>(f, operand);
|
||||
}
|
||||
|
||||
void EightBit::Z80::sbc(uint8_t& operand, uint8_t value) {
|
||||
sub(operand, value, F() & CF);
|
||||
auto& f = F();
|
||||
sub(f, operand, value, f & CF);
|
||||
}
|
||||
|
||||
void EightBit::Z80::andr(uint8_t& operand, uint8_t value) {
|
||||
auto& f = F();
|
||||
void EightBit::Z80::andr(uint8_t& f, uint8_t& operand, uint8_t value) {
|
||||
operand &= value;
|
||||
setFlag(f, HC);
|
||||
clearFlag(f, CF | NF);
|
||||
adjustSZPXY<Z80>(f, operand);
|
||||
}
|
||||
|
||||
void EightBit::Z80::xorr(uint8_t& operand, uint8_t value) {
|
||||
auto& f = F();
|
||||
void EightBit::Z80::xorr(uint8_t& f, uint8_t& operand, uint8_t value) {
|
||||
operand ^= value;
|
||||
clearFlag(f, HC | CF | NF);
|
||||
adjustSZPXY<Z80>(f, operand);
|
||||
}
|
||||
|
||||
void EightBit::Z80::orr(uint8_t& operand, uint8_t value) {
|
||||
auto& f = F();
|
||||
void EightBit::Z80::orr(uint8_t& f, uint8_t& operand, uint8_t value) {
|
||||
operand |= value;
|
||||
clearFlag(f, HC | CF | NF);
|
||||
adjustSZPXY<Z80>(f, operand);
|
||||
}
|
||||
|
||||
void EightBit::Z80::compare(uint8_t value) {
|
||||
auto check = A();
|
||||
sub(check, value);
|
||||
adjustXY<Z80>(F(), value);
|
||||
void EightBit::Z80::compare(uint8_t& f, uint8_t check, uint8_t value) {
|
||||
subtract(f, check, value);
|
||||
adjustXY<Z80>(f, value);
|
||||
}
|
||||
|
||||
#pragma endregion ALU
|
||||
|
||||
#pragma region Shift and rotate
|
||||
|
||||
uint8_t& EightBit::Z80::rlc(uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto carry = operand & Bit7;
|
||||
operand <<= 1;
|
||||
carry ? operand |= Bit0 : operand &= ~Bit0;
|
||||
uint8_t& EightBit::Z80::rlc(uint8_t& f, uint8_t& operand) {
|
||||
const auto carry = operand & Bit7;
|
||||
operand = _rotl8(operand, 1);
|
||||
setFlag(f, CF, carry);
|
||||
clearFlag(f, NF | HC);
|
||||
adjustXY<Z80>(f, operand);
|
||||
return operand;
|
||||
}
|
||||
|
||||
uint8_t& EightBit::Z80::rrc(uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto carry = operand & Bit0;
|
||||
operand >>= 1;
|
||||
carry ? operand |= Bit7 : operand &= ~Bit7;
|
||||
uint8_t& EightBit::Z80::rrc(uint8_t& f, uint8_t& operand) {
|
||||
const auto carry = operand & Bit0;
|
||||
operand = _rotr8(operand, 1);
|
||||
setFlag(f, CF, carry);
|
||||
clearFlag(f, NF | HC);
|
||||
adjustXY<Z80>(f, operand);
|
||||
return operand;
|
||||
}
|
||||
|
||||
uint8_t& EightBit::Z80::rl(uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto oldCarry = f & CF;
|
||||
auto newCarry = operand & Bit7;
|
||||
uint8_t& EightBit::Z80::rl(uint8_t& f, uint8_t& operand) {
|
||||
const auto oldCarry = f & CF;
|
||||
const auto newCarry = operand & Bit7;
|
||||
operand <<= 1;
|
||||
oldCarry ? operand |= Bit0 : operand &= ~Bit0;
|
||||
setFlag(f, CF, newCarry);
|
||||
@ -401,10 +401,9 @@ uint8_t& EightBit::Z80::rl(uint8_t& operand) {
|
||||
return operand;
|
||||
}
|
||||
|
||||
uint8_t& EightBit::Z80::rr(uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto oldCarry = f & CF;
|
||||
auto newCarry = operand & Bit0;
|
||||
uint8_t& EightBit::Z80::rr(uint8_t& f, uint8_t& operand) {
|
||||
const auto oldCarry = f & CF;
|
||||
const auto newCarry = operand & Bit0;
|
||||
operand >>= 1;
|
||||
operand |= oldCarry << 7;
|
||||
setFlag(f, CF, newCarry);
|
||||
@ -415,9 +414,8 @@ uint8_t& EightBit::Z80::rr(uint8_t& operand) {
|
||||
|
||||
//
|
||||
|
||||
uint8_t& EightBit::Z80::sla(uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto newCarry = operand & Bit7;
|
||||
uint8_t& EightBit::Z80::sla(uint8_t& f, uint8_t& operand) {
|
||||
const auto newCarry = operand & Bit7;
|
||||
operand <<= 1;
|
||||
setFlag(f, CF, newCarry);
|
||||
clearFlag(f, NF | HC);
|
||||
@ -425,10 +423,9 @@ uint8_t& EightBit::Z80::sla(uint8_t& operand) {
|
||||
return operand;
|
||||
}
|
||||
|
||||
uint8_t& EightBit::Z80::sra(uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto new7 = operand & Bit7;
|
||||
auto newCarry = operand & Bit0;
|
||||
uint8_t& EightBit::Z80::sra(uint8_t& f, uint8_t& operand) {
|
||||
const auto new7 = operand & Bit7;
|
||||
const auto newCarry = operand & Bit0;
|
||||
operand >>= 1;
|
||||
operand |= new7;
|
||||
setFlag(f, CF, newCarry);
|
||||
@ -437,9 +434,8 @@ uint8_t& EightBit::Z80::sra(uint8_t& operand) {
|
||||
return operand;
|
||||
}
|
||||
|
||||
uint8_t& EightBit::Z80::sll(uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto newCarry = operand & Bit7;
|
||||
uint8_t& EightBit::Z80::sll(uint8_t& f, uint8_t& operand) {
|
||||
const auto newCarry = operand & Bit7;
|
||||
operand <<= 1;
|
||||
operand |= 1;
|
||||
setFlag(f, CF, newCarry);
|
||||
@ -448,9 +444,8 @@ uint8_t& EightBit::Z80::sll(uint8_t& operand) {
|
||||
return operand;
|
||||
}
|
||||
|
||||
uint8_t& EightBit::Z80::srl(uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto newCarry = operand & Bit0;
|
||||
uint8_t& EightBit::Z80::srl(uint8_t& f, uint8_t& operand) {
|
||||
const auto newCarry = operand & Bit0;
|
||||
operand >>= 1;
|
||||
operand &= ~Bit7; // clear bit 7
|
||||
setFlag(f, CF, newCarry);
|
||||
@ -464,24 +459,23 @@ uint8_t& EightBit::Z80::srl(uint8_t& operand) {
|
||||
|
||||
#pragma region BIT/SET/RES
|
||||
|
||||
uint8_t& EightBit::Z80::bit(int n, uint8_t& operand) {
|
||||
auto& f = F();
|
||||
auto carry = f & CF;
|
||||
uint8_t discarded = operand;
|
||||
andr(discarded, 1 << n);
|
||||
uint8_t& EightBit::Z80::bit(uint8_t& f, int n, uint8_t& operand) {
|
||||
const uint8_t discarded = operand & (1 << n);
|
||||
setFlag(f, HC);
|
||||
clearFlag(f, NF);
|
||||
adjustSZXY<Z80>(f, discarded);
|
||||
clearFlag(f, PF, discarded);
|
||||
setFlag(f, CF, carry);
|
||||
return operand;
|
||||
}
|
||||
|
||||
uint8_t& EightBit::Z80::res(int n, uint8_t& operand) {
|
||||
auto bit = 1 << n;
|
||||
const auto bit = 1 << n;
|
||||
operand &= ~bit;
|
||||
return operand;
|
||||
}
|
||||
|
||||
uint8_t& EightBit::Z80::set(int n, uint8_t& operand) {
|
||||
auto bit = 1 << n;
|
||||
const auto bit = 1 << n;
|
||||
operand |= bit;
|
||||
return operand;
|
||||
}
|
||||
@ -493,9 +487,9 @@ uint8_t& EightBit::Z80::set(int n, uint8_t& operand) {
|
||||
void EightBit::Z80::neg() {
|
||||
auto& a = A();
|
||||
auto& f = F();
|
||||
auto original = a;
|
||||
const auto original = a;
|
||||
a = 0;
|
||||
sub(a, original);
|
||||
sub(f, a, original);
|
||||
setFlag(f, PF, original == Bit7);
|
||||
setFlag(f, CF, original);
|
||||
}
|
||||
@ -533,7 +527,7 @@ void EightBit::Z80::cpl() {
|
||||
auto& a = A();
|
||||
auto& f = F();
|
||||
a = ~a;
|
||||
adjustXY<Z80>(f, A());
|
||||
adjustXY<Z80>(f, a);
|
||||
setFlag(f, HC | NF);
|
||||
}
|
||||
|
||||
@ -546,7 +540,7 @@ void EightBit::Z80::scf() {
|
||||
|
||||
void EightBit::Z80::ccf() {
|
||||
auto& f = F();
|
||||
auto carry = f & CF;
|
||||
const auto carry = f & CF;
|
||||
setFlag(f, HC, carry);
|
||||
clearFlag(f, CF, carry);
|
||||
clearFlag(f, NF);
|
||||
@ -574,14 +568,11 @@ void EightBit::Z80::xhtl() {
|
||||
|
||||
#pragma region Block compare instructions
|
||||
|
||||
void EightBit::Z80::blockCompare() {
|
||||
|
||||
const auto& a = A();
|
||||
auto& f = F();
|
||||
void EightBit::Z80::blockCompare(uint8_t a, uint8_t& f) {
|
||||
|
||||
m_memory.ADDRESS() = HL();
|
||||
|
||||
auto value = m_memory.reference();
|
||||
const auto value = m_memory.reference();
|
||||
uint8_t result = a - value;
|
||||
|
||||
setFlag(f, PF, --BC().word);
|
||||
@ -597,31 +588,35 @@ void EightBit::Z80::blockCompare() {
|
||||
setFlag(f, XF, result & Bit3);
|
||||
}
|
||||
|
||||
void EightBit::Z80::cpi() {
|
||||
blockCompare();
|
||||
void EightBit::Z80::cpi(uint8_t a, uint8_t& f) {
|
||||
blockCompare(a, f);
|
||||
HL().word++;
|
||||
MEMPTR().word++;
|
||||
}
|
||||
|
||||
void EightBit::Z80::cpd() {
|
||||
blockCompare();
|
||||
void EightBit::Z80::cpd(uint8_t a, uint8_t& f) {
|
||||
blockCompare(a, f);
|
||||
HL().word--;
|
||||
MEMPTR().word--;
|
||||
}
|
||||
|
||||
bool EightBit::Z80::cpir() {
|
||||
cpi();
|
||||
const auto a = A();
|
||||
auto& f = F();
|
||||
cpi(a, f);
|
||||
MEMPTR() = PC();
|
||||
auto again = (F() & PF) && !(F() & ZF); // See CPI
|
||||
auto again = (f & PF) && !(f & ZF); // See CPI
|
||||
if (again)
|
||||
MEMPTR().word--;
|
||||
return again;
|
||||
}
|
||||
|
||||
bool EightBit::Z80::cpdr() {
|
||||
cpd();
|
||||
const auto a = A();
|
||||
auto& f = F();
|
||||
cpd(a, f);
|
||||
MEMPTR().word = PC().word - 1;
|
||||
auto again = (F() & PF) && !(F() & ZF); // See CPD
|
||||
auto again = (f & PF) && !(f & ZF); // See CPD
|
||||
if (!again)
|
||||
MEMPTR().word--;
|
||||
return again;
|
||||
@ -789,12 +784,14 @@ int EightBit::Z80::execute(uint8_t opcode) {
|
||||
if (!M1())
|
||||
throw std::logic_error("M1 cannot be high");
|
||||
|
||||
auto x = (opcode & 0b11000000) >> 6;
|
||||
auto y = (opcode & 0b111000) >> 3;
|
||||
auto z = (opcode & 0b111);
|
||||
const auto& decoded = m_decodedOpcodes[opcode];
|
||||
|
||||
auto p = (y & 0b110) >> 1;
|
||||
auto q = (y & 1);
|
||||
auto x = decoded.x;
|
||||
auto y = decoded.y;
|
||||
auto z = decoded.z;
|
||||
|
||||
auto p = decoded.p;
|
||||
auto q = decoded.q;
|
||||
|
||||
if (!(m_prefixCB && m_displaced)) {
|
||||
incrementRefresh();
|
||||
@ -802,7 +799,7 @@ int EightBit::Z80::execute(uint8_t opcode) {
|
||||
}
|
||||
|
||||
if (m_prefixCB)
|
||||
executeCB(x, y, z, p, q);
|
||||
executeCB(x, y, z);
|
||||
else if (m_prefixED)
|
||||
executeED(x, y, z, p, q);
|
||||
else
|
||||
@ -814,34 +811,34 @@ int EightBit::Z80::execute(uint8_t opcode) {
|
||||
return cycles;
|
||||
}
|
||||
|
||||
void EightBit::Z80::executeCB(int x, int y, int z, int p, int q) {
|
||||
void EightBit::Z80::executeCB(int x, int y, int z) {
|
||||
auto& f = F();
|
||||
switch (x) {
|
||||
case 0: // rot[y] r[z]
|
||||
switch (y) {
|
||||
case 0:
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = rlc(DISPLACED()) : rlc(R(z)));
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = rlc(f, DISPLACED()) : rlc(f, R(z)));
|
||||
break;
|
||||
case 1:
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = rrc(DISPLACED()) : rrc(R(z)));
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = rrc(f, DISPLACED()) : rrc(f, R(z)));
|
||||
break;
|
||||
case 2:
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = rl(DISPLACED()) : rl(R(z)));
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = rl(f, DISPLACED()) : rl(f, R(z)));
|
||||
break;
|
||||
case 3:
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = rr(DISPLACED()) : rr(R(z)));
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = rr(f, DISPLACED()) : rr(f, R(z)));
|
||||
break;
|
||||
case 4:
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = sla(DISPLACED()) : sla(R(z)));
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = sla(f, DISPLACED()) : sla(f, R(z)));
|
||||
break;
|
||||
case 5:
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = sra(DISPLACED()) : sra(R(z)));
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = sra(f, DISPLACED()) : sra(f, R(z)));
|
||||
break;
|
||||
case 6:
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = sll(DISPLACED()) : sll(R(z)));
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = sll(f, DISPLACED()) : sll(f, R(z)));
|
||||
break;
|
||||
case 7:
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = srl(DISPLACED()) : srl(R(z)));
|
||||
adjustSZP<Z80>(f, m_displaced ? R2(z) = srl(f, DISPLACED()) : srl(f, R(z)));
|
||||
break;
|
||||
}
|
||||
if (m_displaced) {
|
||||
@ -854,11 +851,11 @@ void EightBit::Z80::executeCB(int x, int y, int z, int p, int q) {
|
||||
break;
|
||||
case 1: // BIT y, r[z]
|
||||
if (m_displaced) {
|
||||
bit(y, DISPLACED());
|
||||
bit(f, y, DISPLACED());
|
||||
adjustXY<Z80>(f, MEMPTR().high);
|
||||
cycles += 20;
|
||||
} else {
|
||||
auto operand = bit(y, R(z));
|
||||
auto operand = bit(f, y, R(z));
|
||||
cycles += 8;
|
||||
if (z == 6) {
|
||||
adjustXY<Z80>(f, MEMPTR().high);
|
||||
@ -988,7 +985,7 @@ void EightBit::Z80::executeED(int x, int y, int z, int p, int q) {
|
||||
cycles += 9;
|
||||
break;
|
||||
case 1: // LD R,A
|
||||
REFRESH() = A();
|
||||
REFRESH() = refresh_t::fromUint8(A());
|
||||
cycles += 9;
|
||||
break;
|
||||
case 2: // LD A,I
|
||||
@ -999,7 +996,7 @@ void EightBit::Z80::executeED(int x, int y, int z, int p, int q) {
|
||||
cycles += 9;
|
||||
break;
|
||||
case 3: // LD A,R
|
||||
A() = REFRESH();
|
||||
A() = REFRESH().asUint8();
|
||||
adjustSZXY<Z80>(f, A());
|
||||
clearFlag(f, NF | HC);
|
||||
setFlag(f, PF, IFF2());
|
||||
@ -1048,10 +1045,10 @@ void EightBit::Z80::executeED(int x, int y, int z, int p, int q) {
|
||||
case 1: // CP
|
||||
switch (y) {
|
||||
case 4: // CPI
|
||||
cpi();
|
||||
cpi(A(), f);
|
||||
break;
|
||||
case 5: // CPD
|
||||
cpd();
|
||||
cpd(A(), f);
|
||||
break;
|
||||
case 6: // CPIR
|
||||
if (cpir()) {
|
||||
@ -1141,7 +1138,7 @@ void EightBit::Z80::executeOther(int x, int y, int z, int p, int q) {
|
||||
cycles += 12;
|
||||
break;
|
||||
default: // JR cc,d
|
||||
if (jrConditionalFlag(y - 4))
|
||||
if (jrConditionalFlag(f, y - 4))
|
||||
cycles += 5;
|
||||
cycles += 5;
|
||||
break;
|
||||
@ -1242,16 +1239,16 @@ void EightBit::Z80::executeOther(int x, int y, int z, int p, int q) {
|
||||
} case 7: // Assorted operations on accumulator/flags
|
||||
switch (y) {
|
||||
case 0:
|
||||
rlc(A());
|
||||
rlc(f, A());
|
||||
break;
|
||||
case 1:
|
||||
rrc(A());
|
||||
rrc(f, A());
|
||||
break;
|
||||
case 2:
|
||||
rl(A());
|
||||
rl(f, A());
|
||||
break;
|
||||
case 3:
|
||||
rr(A());
|
||||
rr(f, A());
|
||||
break;
|
||||
case 4:
|
||||
daa();
|
||||
@ -1311,28 +1308,28 @@ void EightBit::Z80::executeOther(int x, int y, int z, int p, int q) {
|
||||
case 2: // Operate on accumulator and register/memory location
|
||||
switch (y) {
|
||||
case 0: // ADD A,r
|
||||
add(A(), R(z));
|
||||
add(f, A(), R(z));
|
||||
break;
|
||||
case 1: // ADC A,r
|
||||
adc(A(), R(z));
|
||||
break;
|
||||
case 2: // SUB r
|
||||
sub(A(), R(z));
|
||||
sub(f, A(), R(z));
|
||||
break;
|
||||
case 3: // SBC A,r
|
||||
sbc(A(), R(z));
|
||||
break;
|
||||
case 4: // AND r
|
||||
andr(A(), R(z));
|
||||
andr(f, A(), R(z));
|
||||
break;
|
||||
case 5: // XOR r
|
||||
xorr(A(), R(z));
|
||||
xorr(f, A(), R(z));
|
||||
break;
|
||||
case 6: // OR r
|
||||
orr(A(), R(z));
|
||||
orr(f, A(), R(z));
|
||||
break;
|
||||
case 7: // CP r
|
||||
compare(R(z));
|
||||
compare(f, A(), R(z));
|
||||
break;
|
||||
}
|
||||
cycles += 4;
|
||||
@ -1342,7 +1339,7 @@ void EightBit::Z80::executeOther(int x, int y, int z, int p, int q) {
|
||||
case 3:
|
||||
switch (z) {
|
||||
case 0: // Conditional return
|
||||
if (returnConditionalFlag(y))
|
||||
if (returnConditionalFlag(f, y))
|
||||
cycles += 6;
|
||||
cycles += 5;
|
||||
break;
|
||||
@ -1374,7 +1371,7 @@ void EightBit::Z80::executeOther(int x, int y, int z, int p, int q) {
|
||||
}
|
||||
break;
|
||||
case 2: // Conditional jump
|
||||
jumpConditionalFlag(y);
|
||||
jumpConditionalFlag(f, y);
|
||||
cycles += 10;
|
||||
break;
|
||||
case 3: // Assorted operations
|
||||
@ -1427,7 +1424,7 @@ void EightBit::Z80::executeOther(int x, int y, int z, int p, int q) {
|
||||
}
|
||||
break;
|
||||
case 4: // Conditional call: CALL cc[y], nn
|
||||
if (callConditionalFlag(y))
|
||||
if (callConditionalFlag(f, y))
|
||||
cycles += 7;
|
||||
cycles += 10;
|
||||
break;
|
||||
@ -1462,28 +1459,28 @@ void EightBit::Z80::executeOther(int x, int y, int z, int p, int q) {
|
||||
case 6: // Operate on accumulator and immediate operand: alu[y] n
|
||||
switch (y) {
|
||||
case 0: // ADD A,n
|
||||
add(A(), fetchByte());
|
||||
add(f, A(), fetchByte());
|
||||
break;
|
||||
case 1: // ADC A,n
|
||||
adc(A(), fetchByte());
|
||||
break;
|
||||
case 2: // SUB n
|
||||
sub(A(), fetchByte());
|
||||
sub(f, A(), fetchByte());
|
||||
break;
|
||||
case 3: // SBC A,n
|
||||
sbc(A(), fetchByte());
|
||||
break;
|
||||
case 4: // AND n
|
||||
andr(A(), fetchByte());
|
||||
andr(f, A(), fetchByte());
|
||||
break;
|
||||
case 5: // XOR n
|
||||
xorr(A(), fetchByte());
|
||||
xorr(f, A(), fetchByte());
|
||||
break;
|
||||
case 6: // OR n
|
||||
orr(A(), fetchByte());
|
||||
orr(f, A(), fetchByte());
|
||||
break;
|
||||
case 7: // CP n
|
||||
compare(fetchByte());
|
||||
compare(f, A(), fetchByte());
|
||||
break;
|
||||
}
|
||||
cycles += 7;
|
||||
|
||||
@ -107,7 +107,7 @@ namespace EightBit {
|
||||
m_memory.reference() = value;
|
||||
}
|
||||
|
||||
void pushWord(register16_t value) {
|
||||
void pushWord(const register16_t& value) {
|
||||
push(value.high);
|
||||
push(value.low);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user