Already exists from IBM: Prime PSA.
Keith Moe
Amdahl/BMC retired
On Wednesday, March 29, 2023, 04:24:25 PM PDT, Charles Mills
<[email protected]> wrote:
Did anyone suggest this before?
On ***a test system only*** writing a special privileged program to fill all of
the addresses from 0 to x'7F' except x'10'-x'13' with X'FF's. That might
trigger errors and expose programs that were surviving the use of "normal"
values from low addresses. And yes, you would have to account for prefixing.
And please correct me if this makes no sense. I have not been real conversant
with the exact usage of low memory since the early S/370 days.
Charles
-----Original Message-----
From: IBM Mainframe Assembler List [mailto:[email protected]] On
Behalf Of syama prasad
Sent: Wednesday, March 29, 2023 4:09 PM
To: [email protected]
Subject: Re: Blocking Low core access from Assembler programs
Hi,
Thanks for all the responses. It looks like there is no practical way to detect
unintentional run-time access to page zero. Programs range from 50+ years old
to quite recent. a recompile of everything with FLAG(PAGE0) and fixing obvious
errors, followed by a test environment run of a few months under zOS 2.5 to
catch any run-time errors seems to be the best way forward.
