On Wed, 27 Apr 2022 13:48:12 -0400, Steve Smith wrote:
>Well, S0C4-11 does not mean the storage is fetch-protected. It means the
>virtual address doesn't exist. ..
>
In SA22-7871-10 z/Architecture IBM Reference Summary
I read:
Program-Interruption Codes
At real-storage locations 142-143 (8E-8F hex)
Code
Instr.
(Hex) Condition ILC Set
Ending
0001 Operation exception 1 2 3
S
0002 Privileged-operation exception 2 3
S
0003 Execute exception 2 3
S
0004 Protection exception 1 2 3
S T
0005 Addressing exception 1 2 3
S T
...
A Historian told me long ago that Addressing exceptions were so rare
before DAT that MVS/XA elected to reflect 0005 as S0C4 for
compatibility with existing code.
--
gil
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