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