As an assembler routine (especially one that is not utilizing LE services), you have the responsibility to maintain standard register saving conventions (unless your caller expects otherwise): making sure that the return to the caller is with - low halves of GPRs 2-13 unchanged - high halves of GPRs 2-14 unchanged ("14" is not a typo) - ARs 2-13 unchanged.
How you accomplish that is up to you. There are many ways including -- use of linkage stack -- saving and restoring high halves within the section using them rather than as part of the prolog/epilog. Since the post was about using 8-byte GPRs but not AMODE 64, it is quite feasible to do the saving/restoring outside of the prolog/epilog. Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- 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