Register contents when Exit 54 passes control back to JES2

Upon return from this exit, the register contents must be:

A return code of:

0: Tells JES2 that if any additional exit routines are associated with this exit, call the next consecutive exit routine. If there are no additional exit routines associated with this exit, perform standard input processing.
4: Tells JES2 to ignore any other exit routines associated with this exit and to perform standard input processing.
8: For JES2 control statements and JCL statements, tells JES2 not to perform standard processing and just write the statement to the JCL data set.
12: Tells JES2 to cancel the job because an illegal control statement has been detected; output (the incomplete JCL images listing) is produced.
16: Tells JES2 to purge the job because an illegal control statement has been detected; no output is produced.

Note: For all JES2 control statements preceding the JOB card (X054PREJ on), a return code higher than 4 is ignored.