Register contents when Exit 53 passes control back to JES2

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, use the current setting of the ACCTFLD parameter on the JOBDEF statement to determine whether to execute the HASPRSCN subroutine.
4: Tells JES2 to ignore any other exit routines associated with this exit and to use the current setting of the ACCTFLD parameter on the JOBDEF statement to determine whether to execute HASPRSCN.
8: Tells JES2 to suppress execution of HASPRSCN and to complete job card processing.
12: Tells JES2 to cancel the job because an illegal accounting field has been detected. Tells JES2 to suppress execution of HASPRSCN and to queue the job for output; output (the incomplete JCL images listing) is produced.