Register Settings

You must set the registers at entry to and upon return from FUSCFAPI.

At entry to FUSCFAPI, you must set the following registers:

  • R1: address of the address of APIDSECT
  • R13: save area address
  • R14: return address
  • R15: address of FUSCFAPI entry point

Upon return from FUSCFAPI, you must set the following registers:

  • R0 - R14: unchanged
  • R15: return code of the request