On 2/2/2023 2:36 PM, Paul Edwards wrote:
But on top of that, I was looking for a z/OS change to
guarantee the high halves were zero. And the new
information is that I don't need that guarantee. I can
make my S/370 applications "more-properly-written"
by taking clear of clearing the high halves themselves,
without being dependent on z/OS.
We take exactly the opposite approach because we have been "burned."
We set Traps(IeaInitArSrb,IeaInitRegsTask) in DIAGxx to ensure the
operating system puts garbage in the ARs and the high halves.
That way we won't accidentally develop code that depends on these
registers being pre-initialized to zero.
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
https://www.phoenixsoftware.com/
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