72 lines
1.2 KiB
C++
72 lines
1.2 KiB
C++
#pragma once
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#include <string>
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#include <cstdint>
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namespace EightBit {
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struct StatusFlags {
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bool S;
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bool Z;
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bool AC;
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bool P;
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bool C;
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enum StatusBits {
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Sign = 0x80, // S
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Zero = 0x40, // Z
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AuxiliaryCarry = 0x10, // AC
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Parity = 0x4, // Z
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Carry = 0x1, // S
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};
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StatusFlags(uint8_t value) {
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S = (value & StatusBits::Sign) != 0;
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Z = (value & StatusBits::Zero) != 0;
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AC = (value & StatusBits::AuxiliaryCarry) != 0;
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P = (value & StatusBits::Parity) != 0;
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C = (value & StatusBits::Carry) != 0;
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}
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operator uint8_t() const {
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uint8_t flags = 0;
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if (S)
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flags |= StatusBits::Sign;
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if (Z)
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flags |= StatusBits::Zero;
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flags &= ~0x20; // Reserved off
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if (AC)
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flags |= StatusBits::AuxiliaryCarry;
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flags &= ~0x8; // Reserved off
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if (P)
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flags |= StatusBits::Parity;
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flags |= 0x2; // Reserved on
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if (C)
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flags |= StatusBits::Carry;
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return flags;
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}
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operator std::string() const {
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std::string returned;
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returned += S ? "S" : "-";
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returned += Z ? "Z" : "-";
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returned += "0";
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returned += AC ? "A" : "-";
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returned += "0";
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returned += P ? "P" : "-";
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returned += "1";
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returned += C ? "C" : "-";
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return returned;
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}
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};
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} |