Doesn't 64-bit C call your amode 31 program using the XPLINK interface? I'm not sure XPLINK has the right value in R14 for PR to set the return mode correctly, but I confess I have done no practical work with XPLINK, so I may be off base here.
You could CC your question to the Assembler list as well, though I think almost everyone who lurks there also lurks here. Peter -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Colin Paice Sent: Tuesday, June 28, 2022 10:13 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: is there any documentation on using the new 64 bit instructions? 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 -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
