Writing an early verification routine

An early verification routine, written for the ENVIR=VERIFY option, receives control from SAF in the usual way from the external security manager whose entry point is addressed by field SAFVRACR in the SAF vector table.

It receives control in the same state as its caller, as follows:
  • Problem-program state
  • Task mode (usually the CICS® quasi-reentrant TCB)
  • PSW storage key 8
  • 31-bit addressing mode
  • Primary address translation mode.
Register 13 points to a standard 18-word save area. Register 1 points to a 2-word parameter list, where:
  • The first word is the address of the SAF parameter list for the VERIFY function.
  • The second word is the address of a 152-byte work area.