There is a preceding MODESET KEY=ZERO. It wouldn't make sense for that to reset Control Register 3, turning on bit 0 and off bit 8, would it? "You can set any SPK you want, so long as it is the one you already have."
Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Charles Mills Sent: Monday, December 12, 2016 3:54 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Question on SPKA and Control Register 3 Hmmm. I am seeing the following in Extended Addressability: "All programs are initially dispatched with a PKM value equal to the storage protect key of the program's TCB or SRB. Example: A PKM value of X'0080' represents key 8 and X'0001' represents key 15. The PC, PR, and PT instructions can change the PKM value." I wonder why I am getting a S0C2 on SPKA 0(R1) when R1 contains FFFFFF80, I was almost surely dispatched with Key 8, and there have been no Px's that should have changed the mask. Hard to picture that LE would change it gratuitously. (PoOp says "Bits 0-55 and 60-63 of the second-operand address are ignored.") Anyone have any ideas? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
