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MARK versus MTPS

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folkert van heusden 2022-06-03 11:48:06 +02:00
parent 1e748d3d37
commit 649516df18
1 changed files with 13 additions and 3 deletions
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16
cpu.cpp
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@ -1281,9 +1281,19 @@ bool cpu::single_operand_instructions(const uint16_t instr)
break;
}
case 0b000110100: // MTPS (put something in PSW)
psw &= 0xff00; // only alter lower 8 bits
psw |= getGAM(dst_mode, dst_reg, word_mode, false) & 0xef; // can't change bit 4
case 0b000110100: // MARK/MTPS (put something in PSW)
if (word_mode) { // MTPS
psw &= 0xff00; // only alter lower 8 bits
psw |= getGAM(dst_mode, dst_reg, word_mode, false) & 0xef; // can't change bit 4
}
else {
setRegister(6, getPC() + dst * 2);
setPC(getRegister(5));
setRegister(5, popStack());
}
break;
case 0b000110111: // MFPS (get PSW to something) / SXT