On 7/2/2016 11:27 AM, Ed Jaffe wrote:
On 7/1/2016 10:33 PM, Paul Schuster wrote:
Ed:
Can you elaborate on the reason(s) for your methodology:
"We routinely load base registers and "uninitialized" pointers to
7FFFF000 (or sometimes 7FFFFBAD) rather than zero."
The one reason I can visualize is that instead of unintentionally
accessing something in low core you would experience a S0C4 instead.
That is the #1 reason! Of course, we now have the ZAD PER interrupt to
help catch accidental references to page zero that occur during in-house
testing, but that's not nearly as effective as a straight-up 0C4 abend!
The secondary reason is IEBEYEBALL of dumps, traces, etc. If an address
contains 7FFFFBAD then you know it's an intentionally "bad" address.
Great, IEBIBALL has been replaced by IEBEYEBALL? No wonder it's not
working for me anymore, program object out of a PDSE....
Regards,
Tom Conley
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