The assembler services guide doesn't specify what is in (bottom half of) R14 upon return. Also, on return to an AMODE(64) routine via BASSM/BSM, R14 would have the low-order bit set.
Robert -----Original Message----- From: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> On Behalf Of Paul Gilmartin Sent: Monday, November 29, 2021 14:01 To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: Base-less macros On Nov 29, 2021, at 12:41:51, Ngan, Robert (DXC Luxoft) wrote: > > DON'T DO THAT! > I had to find/redo all our code that did this when our subroutine return > logic was changed to use a BIC instruction. > Which of you violated standard linkage conventions? My understanding is that R14 is expected to point to the instruction after the CALL; R15 to the ENTRY point. Either may be changed by an embedded CALL and should be treated as volatile. RETURN should use LM to retrieve the value of R14, etc. > -----Original Message----- > From: Steve Smith > Sent: Thursday, November 25, 2021 13:49 > > My suggestion of using R14 for the base was because it's already set by the > call to the subroutine. -- gil
