From ae00c956796d3b4589ab645508ca05d9ab3f666d Mon Sep 17 00:00:00 2001 From: folkert van heusden Date: Sun, 21 Apr 2024 22:51:58 +0200 Subject: [PATCH] SPL only in kernel mode --- cpu.cpp | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/cpu.cpp b/cpu.cpp index 9a362d1..7827463 100644 --- a/cpu.cpp +++ b/cpu.cpp @@ -1569,8 +1569,11 @@ bool cpu::condition_code_operations(const uint16_t instr) } if ((instr & ~7) == 0000230) { // SPLx - int level = instr & 7; - setPSW_spl(level); + if (getPSW_runmode() == 0) { // only in kernel mode + int level = instr & 7; + + setPSW_spl(level); + } // // trap via vector 010 only(?) on an 11/60 and not(?) on an 11/70 // trap(010);