You will take a performance hit (unless things have improved) On Mon, 25 Oct 2021 09:04:02 -0500 John McKown <john.archie.mck...@gmail.com> wrote:
:>Personally, I really would like the Linkage Stack to become generally :>useful. So I could just use a BAKR to save state on entry and PC to return. :>Not likely, but y can dream. At least until I retire sometime next year. :>Dates to get rid of our z9BC keep getting pushed back. But my boss says :>he's planning to leave on Jun. And when he goes, I go. :> :>On Mon, Oct 25, 2021, 08:55 Peter Relson <rel...@us.ibm.com> wrote: :> :>> This discussion has morphed into a discussion of linkage conventions which :>> are clearly spelled out in the publications, such as with respect to save :>> area sizes and formats. :>> I suggest that those interested take the time to re-read those sections. :>> :>> A "legacy" AMODE 24 or AMODE 31 routine will not even know about high :>> halves and thus has no need to save/restore them and thus its 72-byte save :>> area linkage works just fine. For z/OS, unless otherwise stated, the high :>> halves of regs 0,1,15 are not to be expected to be preserved across any :>> interface. :>> :>> Whether the target routine saves information in a caller-provided save :>> area, or some in such an area and more elsewhere, or on the linkage stack :>> is up to its interface definition that the caller is expected to comply :>> with. -- 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
