> BAKR is not a S/370 instruction ?
IBM Enterprise Systems Architecture/370 Principles of Operation, SA22-7200-0, <http://bitsavers.org/pdf/ibm/370/princOps/SA22-7200-0_370-ESA_Principles_of_Operation_Aug88.pdf>, p 10-5, has Branch and Stack. Or weren't you counting 370-ESA as 370? ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Peter Relson <rel...@us.ibm.com> Sent: Thursday, February 2, 2023 11:38 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: GETMAIN LOC=32 I couldn't find the original post for this thread even in the archives, so I don't know what this has to do with GETMAIN, or where "LOC=32" came into things since the parameter is LOC=31. <snip> I am exactly executing in AMODE 64. And so I need the high halves to be clear at all times. Because I am using pure S/370 instructions. </snip> I'll bite. Why would you choose to run in AMODE 64 if you are trying to restrict yourself to S/370 instructions? And why not even S/390 instructions, let alone z/Architecture instructions? Further, "need the high halves to be clear at all times" is not true. You only would need the high halves (PLUS bit 32) to be zero for a register used to access data and only at that point. At a minimum, you are surely violating linkage conventions by not preserving the high halves of any regs 2-14 that you might use. (BAKR is not a S/370 instruction; if you allow for use of BAKR then you can conform to linkage conventions without needing to use a zArch instruction such as STMG or STMH) Peter Relson z/OS Core Technology Deisgn ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
