I have no experience with this specifically (I do have lots of 31-bit C/HLASM experience) but if you are writing the HLASM from scratch, or re-writing it somewhat anyway, I would think the easiest thing would be just to write the HLASM to be 64-bit.
I found the thought of 64-bit to be scary but the reality was not too bad. (One of my called routines switches back and forth because it references above-the-bar storage.) Yes, those high halves will get you again and again. Yes, LLGTR and LLGT are your friends. I kind of got into the habit of just thinking of them as "my load instructions." I checked with Dr. Shum and he said there was no performance penalty relative to "normal" loads. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Joe Monk Sent: Tuesday, June 28, 2022 10:33 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: is there any documentation on using the new 64 bit instructions? If youre using LE, you can't mix 31 and 64 bit, because 64-bit C using LE uses a 64-bit XPLINK which passes parameters from the stack above the bar. I think you will have to write a glue assembler module to receive control in AMODE 64 then SAM31 CALL SAM64 and back. Joe On Tue, Jun 28, 2022 at 9:13 AM Colin Paice <colinpai...@gmail.com> wrote: > I've been working on calling an (amode 31) assembler program from a 64 bit > C program, and have been struggling.Is there is a good guide on how to use > these new instructions? > For example > 1) > I've found you need to use a LLGTR R1... instruction to clear the register > before using a L R1... because without it the high part of the register > will have some 64 bit rubbish in it > > 2) > I used > > BAKR R14,0 > PR > But it kept returning in amode 24 bit mode. It needs BSM 14,0 before > the BAKR.__ > > The POP tells you all about the instructions - but not how to use it. The > z/OS doc says use BACK/PR without mentioning the BSM, so this is not > completely trustworthy. > _________________________ > Is there a better place to ask? > > Colin > > ---------------------------------------------------------------------- > 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
