I think I understand where you got confused.

Quoting: "Addresses generated by the CPU that may be virtual addresses 
always wrap."

The cases where interrupts can happen are not with virtual memory accesses 
(such as your example).

Eric Rossman, CISSPĀ®
ICSF Cryptographic Security Development
z/OS Enabling Technologies
[email protected]

"Paul Gilmartin" <[email protected]>:

> An exception is *never* recognized on an LA instruction, even 
thoughwraparound
> 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.


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