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cannot replace the run-mode bits nor the set of registers

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folkert van heusden 2024-04-04 18:03:39 +02:00
parent 30a6c9229c
commit 2334daff16
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 6 additions and 3 deletions
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9
cpu.cpp
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@ -277,11 +277,14 @@ int cpu::getPSW_spl() const
void cpu::setPSW(const uint16_t v, const bool limited) void cpu::setPSW(const uint16_t v, const bool limited)
{ {
if (limited) if (limited) {
psw = (v & 0174037) | (psw & 0174340); // cannot replace the run-mode bits nor the set of registers
else psw = (psw & 177400) | (v & 0377);
}
else {
psw = v & 0174377; // mask off 'unused' bits (8-10) psw = v & 0174377; // mask off 'unused' bits (8-10)
} }
}
void cpu::setPSW_flags_nzv(const uint16_t value, const word_mode_t word_mode) void cpu::setPSW_flags_nzv(const uint16_t value, const word_mode_t word_mode)
{ {