Jim Mulder wrote:
It is not an architecture issue. The IARV64 service of z/OS chooses
to never create any virtual storage in this range as a diagnostic aid.
and it wqere better if he had written ". . . chooses by default not to
create . . . '
'Never' is much too strong a word here; interpreted more literally than Jim
meant it, it is indeed wrong.
There are circumstances in which it is appropriate to code either or both of
GUARDSIZE=0 or GUARDLOC=HIGH in an IARV64 macro instruction. That said, the
default is useful for catching AMODE(31) adsdress-reference programming
errors.
John Gilmore
Ashland, MA 01721
USA
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