hardware feature. I alos like that the page tables can be set so that a page is read-only even for PSW key 0 users.
John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * [email protected] * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of Ray Overby > Sent: Wednesday, December 15, 2010 2:12 PM > To: [email protected] > Subject: Re: Batch program to update CVTUSER > > Another tactful way to say this is: > > "How long would z/OS continue to run after this program is executed?" > > Low address protection may cause this program to abend with a S0C4 if > they are lucky....... > > Is low address protection a hardware or software feature? > > On 12/15/2010 14:06 PM, Tom Marchant wrote: > > On Wed, 15 Dec 2010 14:22:03 -0500, Lorne Dudley wrote: > > > >> I'm having problems getting the following batch program to run > >> correctly. It's running from an authorized library and > abends with 0C4, > >> reason code 4. > >> > >> The book says "the key of the storage area that the running program > >> tries to access is different from that of the running program". > >> > >> > -------------------------------------------------------------- > --------------- > >> TITLE 'CVTUSER TEST' > >> CVT DSECT=YES,LIST=YES .CVT DSECT > >> Y CSECT , > >> * > >> * REGISTER EQUATES > >> * > >> R0 EQU 0 . > >> R1 EQU 1 . > >> R2 EQU 2 .CVT ADDRESS > >> R3 EQU 3 .CVTUSER ADDRESS > >> R4 EQU 4 . > >> R9 EQU 9 .BASE ADDRESS OF THIS EXIT > >> R10 EQU 10 . > >> R15 EQU 15 . > >> * > >> SAVE (14,12),,X_V1.0_&SYSDATE SAVE& ID > >> LR R9,R15 .SET UP ADDRESSABILITY > >> USING Y,R9 .SET UP ADDRESSABILITY > >> USING CVT,R2 .CVT DSECT > >> * > >> MODESET KEY=ZERO,MODE=SUP > >> * > >> L R2,CVTPTR LOAD UP CVT ADDRESS > >> L R3,CVTUSER LOAD CVTUSER ADDRESS > >> * move 4 characters to CVTUSER > >> MVC R3(4),=C'TEST' > >> RETURN (14,12),RC=0 .RETURN TO CALLER > >> LTORG > >> PATCH DC 2D'0' .16 BYTE PATCH AREA > >> END > >> > > I don't want to be rude, but if you are not proficient at coding > > in assembler and debugging, you really shouldn't be writing > > authorized code. > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
