I understand Thank you
> On Jun 27, 2019, at 8:43 AM, Peter Relson <rel...@us.ibm.com> wrote: > > <snip> > I think RTM does a RP and RP is setup for a 16 byte PSW you think they > could of found 8 bytes in SDWARC4 > </snip> > > RTM does not do a "resume program" (RP instruction). Even if this were > available for the decades that RTM has supported retry, it would not have > been of any help whatsoever. > > If someone makes a business case for needing to retry to a 64-bit address > *AND* preserve the contents of all 16 registers, that could be considered > for the future. > But it is fully possibly to accomplish retrying to a 64-bit address, as I > have pointed out, as long as you are willing to sacrifice register 15 (or, > if providing your own stub, any other register except perhaps register 0). > > There is no available reserved space in SDWARC4, as you could tell by > looking. Adding things to the SDWA has cost (including negative > ramifications to the amount of storage available below 16M), and > potentially significant ramifications to things like the dump header. As a > result, updates are not made lightly. > > If you set SDWAG64R15, and identify CVTBSM0F as the retry point, you also > need to specify RETRY15=YES on SETRP so that reg 15 is available with your > value when the CVTBSM0F BSM is issued. > > Peter Relson > z/OS Core Technology Design
