When the pre-ACS exit gets control, the general-purpose registers
have the following content:
- Register
- Contents
- 0
- Not applicable
- 1
- Address of the parameter list mapped by IGDACERO.
- 2-12
- Not applicable
- 13
- Address of register save area
- 14
- Caller's return address
- 15
- Address of the exit's entry point
Note: Because this routine is called before ACS routines,
some variables, such as Data Class, will not have been set. JCL parameter
values should be available.