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trap: always register deltas unless error set in MMR0

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folkert van heusden 2022-04-14 17:50:18 +02:00
parent 1673548c37
commit 5a4057f6a1
1 changed files with 10 additions and 15 deletions
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25
cpu.cpp
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@ -1408,23 +1408,11 @@ bool cpu::misc_operations(const uint16_t instr)
}
if ((instr >> 8) == 0b10001000) { // EMT
if ((b->getMMR1() & 0160000) == 0) {
b->setMMR2(030);
b->addToMMR1(-2, 6);
b->addToMMR1(-2, 6);
}
trap(030);
return true;
}
if ((instr >> 8) == 0b10001001) { // TRAP
if ((b->getMMR1() & 0160000) == 0) {
b->setMMR2(034);
b->addToMMR1(-2, 6);
b->addToMMR1(-2, 6);
}
trap(034);
return true;
}
@ -1497,6 +1485,13 @@ void cpu::trap(const uint16_t vector, const int new_ipl)
psw &= 037777; // mask off 14/15
}
if ((b->getMMR1() & 0160000) == 0) {
D(fprintf(stderr, "trap: register vector/2xregister-undo\n");)
b->setMMR2(vector);
b->addToMMR1(-2, 6);
b->addToMMR1(-2, 6);
}
setPC(b->readWord(vector + 0));
// switch to kernel mode & update 'previous mode'
@ -1997,9 +1992,6 @@ void cpu::step()
if ((b->getMMR1() & 0160000) == 0)
b->clearMMR1();
if (check_queued_interrupts())
return;
if (scheduled_trap) {
trap(scheduled_trap, 7);
@ -2008,6 +2000,9 @@ void cpu::step()
return;
}
if (check_queued_interrupts())
return;
uint16_t temp_pc = getPC();
b->setMMR2(temp_pc);