On Sat, 23 Oct 2021 21:16:48 -0400, Eric D Rossman wrote:
>You are welcome to submit an RCF. However, the interruption is not on
>accessing storage. It is on the address wrapping.
>
>I'm not involved in the architecture but I strongly doubt that the book is
>wrong.
>
>Eric Rossman, CISSP�
>ICSF Cryptographic Security Development
>
An exception is *never* recognized on an LA instruction, even though wraparound
might occur or the value before truncation exceeds 24, 32, or 64 bits.
The sequence:
LHG R1,=H(-1)
L R2,0(,R1)
... is pretty much guaranteed to recognize an exception, but not because of
wraparound or truncation to 24, 31, or 64 bits.
>"Paul Gilmartin" _____________________________________________
>
>> I'll disagree with that. An interrupt condition is *never* recognized
>> "during generation of [an] address." An addressing exception or a
>> protection exception may be recognized subsequently when that
>> address is used to access storage. And that is unrelated to whether
>> a carry out of the high-order bit position occurred.
>>
>> Address generation and storage access are two different topics. They
>> should be discussed separately.
>>
>> Should I submit an RCF?
-- gil
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
