BAKR (branch and stack) is an ESA/390 instruction. Joe
On Thu, Feb 2, 2023 at 11:00 AM Seymour J Metz <sme...@gmu.edu> wrote: > > 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 > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
