Standard IBM z/OS calling convention. R13 Save Area, R14 return address, R15 address being called, R0 ?, R1 address to parameter list, R2-14 will be restored from R13 save area before BR14 to return to caller.
https://www.ibm.com/docs/en/zos/2.3.0?topic=guide-linkage-conventions On Sat, Feb 12, 2022 at 6:54 PM Binyamin Dissen <bdis...@dissensoftware.com> wrote: > > The manual (MVS Programming: Assembler Services Reference, Volume 1 (ABE-HSP)) > states > > 2-12 Used as work registers by the system. > > but I am looking at some old functional code which seems to expect (several?) > registers values at ATTACH time be passed as is to the subtask. > > Can someone enlighten me as to whether this is luck or an undocumented API. I > prefer to follow the old adage - if it ain't broke, don't fix it. > > -- > Binyamin Dissen <bdis...@dissensoftware.com> > http://www.dissensoftware.com > > Director, Dissen Software, Bar & Grill - Israel > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
