mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2024-11-03 05:05:15 +00:00
72 lines
1.2 KiB
C
72 lines
1.2 KiB
C
|
#pragma once
|
||
|
|
|
||
|
|
#include <string>
|
||
|
|
#include <cstdint>
|
||
|
|
|
||
|
|
namespace EightBit {
|
||
|
|
struct StatusFlags {
|
||
|
|
|
||
|
|
bool S;
|
||
|
|
bool Z;
|
||
|
|
bool AC;
|
||
|
|
bool P;
|
||
|
|
bool C;
|
||
|
|
|
||
|
|
enum StatusBits {
|
||
|
|
Sign = 0x80, // S
|
||
|
|
Zero = 0x40, // Z
|
||
|
|
AuxiliaryCarry = 0x10, // AC
|
||
|
|
Parity = 0x4, // Z
|
||
|
|
Carry = 0x1, // S
|
||
|
|
};
|
||
|
|
|
||
|
|
StatusFlags(uint8_t value) {
|
||
|
|
S = (value & StatusBits::Sign) != 0;
|
||
|
|
Z = (value & StatusBits::Zero) != 0;
|
||
|
|
AC = (value & StatusBits::AuxiliaryCarry) != 0;
|
||
|
|
P = (value & StatusBits::Parity) != 0;
|
||
|
|
C = (value & StatusBits::Carry) != 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
operator uint8_t() const {
|
||
|
|
|
||
|
|
uint8_t flags = 0;
|
||
|
|
|
||
|
|
if (S)
|
||
|
|
flags |= StatusBits::Sign;
|
||
|
|
|
||
|
|
if (Z)
|
||
|
|
flags |= StatusBits::Zero;
|
||
|
|
|
||
|
|
flags &= ~0x20; // Reserved off
|
||
|
|
|
||
|
|
if (AC)
|
||
|
|
flags |= StatusBits::AuxiliaryCarry;
|
||
|
|
|
||
|
|
flags &= ~0x8; // Reserved off
|
||
|
|
|
||
|
|
if (P)
|
||
|
|
flags |= StatusBits::Parity;
|
||
|
|
|
||
|
|
flags |= 0x2; // Reserved on
|
||
|
|
|
||
|
|
if (C)
|
||
|
|
flags |= StatusBits::Carry;
|
||
|
|
|
||
|
|
return flags;
|
||
|
|
}
|
||
|
|
|
||
|
|
operator std::string() const {
|
||
|
|
std::string returned;
|
||
|
|
returned += S ? "S" : "-";
|
||
|
|
returned += Z ? "Z" : "-";
|
||
|
|
returned += "0";
|
||
|
|
returned += AC ? "A" : "-";
|
||
|
|
returned += "0";
|
||
|
|
returned += P ? "P" : "-";
|
||
|
|
returned += "1";
|
||
|
|
returned += C ? "C" : "-";
|
||
|
|
return returned;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|