I'm aware of a 72-byte format and several 144-byte formats; I'm not aware of a 128 byte format. 128 bytes would not allow space for both a prefix and the top halves of the GRs.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List [ASSEMBLER-LIST@LISTSERV.UGA.EDU] on behalf of Dave Clark [dlcl...@winsupplyinc.com] Sent: Thursday, January 20, 2022 10:29 AM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: Saving Caller's 64-bit Registers "IBM Mainframe Assembler List" <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on 01/20/2022 09:36:03 AM: > "IBM Mainframe Assembler List" <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on > 01/19/2022 06:05:12 PM: > > At program entry: > > > > STMH 2,14,your-high-halves-save-area 13 fullwords for 2-14 high halves > > > > At program exit: > > > > LMH 2,14, your-high-halves-save-area > > Thanks. I take it that I shouldn't presume the caller has > provided an extended save area for accommodating the high halves of the > registers. Thus, on entry, I save the low halves in the caller's save > area but save the high halves in my own extended save area? Or is there > some other means of knowing whether or not to save the high halves in the > caller's save area? I found that a "standard register save area" is now defined by IBM as 128 bytes long. That would be the original 72 bytes (18 full words) plus 56 bytes (an additional 14 full words). But the links aren't working so I can't drill into any further details than that. Does this mean it is only intended that 14 high halves should be saved/restored? Would that omit registers 0 and 15, or what? Sincerely, Dave Clark -- int.ext: 91078 direct: (937) 531-6378 home: (937) 751-3300 Winsupply Group Services 3110 Kettering Boulevard Dayton, Ohio 45439 USA (937) 294-5331 > > > Sincerely, > > Dave Clark > -- > int.ext: 91078 > direct: (937) 531-6378 > home: (937) 751-3300 > > Winsupply Group Services > 3110 Kettering Boulevard > Dayton, Ohio 45439 USA > (937) 294-5331 > > > > > ********************************************************************************************* > This email message and any attachments is for use only by the named > addressee(s) and may contain confidential, privileged and/or proprietary > information. If you have received this message in error, please > immediately notify the sender and delete and destroy the message and all > copies. All unauthorized direct or indirect use or disclosure of this > message is strictly prohibited. No right to confidentiality or privilege > is waived or lost by any error in transmission. > ********************************************************************************************* ********************************************************************************************* This email message and any attachments is for use only by the named addressee(s) and may contain confidential, privileged and/or proprietary information. If you have received this message in error, please immediately notify the sender and delete and destroy the message and all copies. All unauthorized direct or indirect use or disclosure of this message is strictly prohibited. No right to confidentiality or privilege is waived or lost by any error in transmission. *********************************************************************************************
