> :>> I don't see any obvious Millicode support for the AR address, so I query > :>- > :>> when a PC defined with an ARR is executed, does it cause an interrupt > :>which > :>> then issues IEAARR under the covers? That a FRR would be faster? > > :> ARR is a software concept, not machine architecture. Nothing special > :>happens with regard to an ARR when the PC instruction is executed. > > :> RTM2 processing examines the linkage stack to look for ARRs. > > Maybe I am looking in the wrong manual, but the POPs does not show me where > this ARR pointer is saved in either the Entry Table or Linkage Stack entry.
z/OS uses the Entry Parameter in the Entry-Table Entry to point to an area of ESQA storage which contains the user parms and the ARR information. > But if I understand you correctly, enabling the ARR as part of a PC > instruction is free? Yes. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
