Access Register mode

Starting with Version 6, the following MVS restrictions are applicable to AR mode (this applies only to applications coded in Assembler):

  • tableBASE must be called in a primary mode, failure to do this may result in unpredictable results.
  • tableBASE zeroes ALL access registers (A0-A15) on return to a caller. It is a responsibility of the caller to save and restore its access registers.