Yeah, I should have looked in the POPs rather than just the system commands reference.
Thanks. On Mon, 24 Jun 2024 17:38:57 -0400 Tony Harminc <[email protected]> wrote: :>On Mon, 24 Jun 2024 at 17:22, Binyamin Dissen < :>[email protected]> wrote: :> :>From the doc it would appear that the ZAD trap would hit even if the :>> instruction has both index and base register zero specified, such as :>> :>> L Rx,PSAAOLD(0,0) :>> :>> Am I understanding correctly? :>> :> :>I don't think so. :> :>"When the PER zero-address-detection facility is :>installed, a zero-address-detection event occurs :>whenever a CPU makes a storage access using an :>effective operand address formed from a general reg- :>ister, or subfield of a general register, containing :>zero. However, during execution of an RX-, RXE-, :>RXF-, RXY-, or VRX-format instruction, the event :>occurs only if the CPU makes a storage access using :>an effective operand address formed under one of :>the following conditions: :>1. The base register number is zero, the index reg- :>ister number is nonzero, and the index register :>contains zero. :>2. The index register number is zero, the base reg- :>ister number is nonzero, and the base register :>contains zero. :>3. When both the base register number and the :>index register number are nonzero, it is unpre- :>dictable which one of the following conditions :>causes the event: :>(a) The base register contains zero. :>(b) The sum of the contents of the base register :>and the index register is zero." :> :>Tony H. :> :>---------------------------------------------------------------------- :>For IBM-MAIN subscribe / signoff / archive access instructions, :>send email to [email protected] with the message: INFO IBM-MAIN -- Binyamin Dissen <[email protected]> http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
