z/OS has a lot of code that requires access to the PSA. Making it inaccessible would break applications.
Of course, the machine has no core. ________________________________________ From: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> on behalf of syama prasad <000013f87d4b715f-dmarc-requ...@listserv.uga.edu> Sent: Monday, March 27, 2023 6:47 PM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Blocking Low core access from Assembler programs Hi, Is it possible to force an Assembler program to hit an access error if it tries to load data from the low core (page starting from address zero)?Assembler *PROCESS FLAG(PAGE0) " helps to find cases like MVC TARGET,1But will it be possible to have a run time detection and possibly a dump if the program tries to do things likeLA R5,1MVC TARGET,0(R5)Basically, any way to restrict access of an application program to PSA- first control block? Regards,Syama
