>IIRC, the PKM (PSW Key Mask) starts at x'0080' and gets changed to
>x'00C0' after an abend. Weird.
You're not remembering correctly. It starts as "TCB key plus key 9". "Plus
key 9" is always done on current machines.
>That's why I never use MODESET MODE=PROB, because the stupid SVC clobbers
>the PKM to show only the current key ("Broke As Designed" B.A.D.).
Those concerned about system integrity might disagree with your opinion.
I know you weren't referring to the "key 9" part. It does reset it to the
key plus key 9.
If you don't use MODESET MODE=PROB, and you need to get to problem state,
you are likely doing something that you should not be doing (LPSW to change
state comes to mind). The system, by the way, does not prevent you from
decreasing your authority from the state in which you got control (as it
cannot), but really does not support your doing so.
Peter Relson
z/OS Core Technology Design
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