>Must I now use extended save areas, as I am doing something >to the top halves of the GPRs, or will the system take >care of that for me?
Assuming this is a simple application, the system is not going to do anything for you with respect to saving registers. If you are responsible for your caller, then it is your responsibility to ensure that you return to your caller with the high halves of registers 2-14 unchanged. Thus, if you restrict yourself to regs 0,1,15 you do not have to preserve high halves. If you do need to save/restore, then there are several choices of which BAKR...PR is one, STMH...LMH is another, and having your caller provide a 144-byte savearea and using STMG...LMG is another. Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
