Register contents when Exit 10 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 more exit routines are associated with this exit, execute the next consecutive exit routine. If there are no more exit routines associated with this exit, continue with normal processing by queuing the CMB for transmission.
4: Tells JES2 to ignore any additional exit routines associated with this exit and to continue with normal processing by queuing the CMB for transmission.
8: Tells JES2 to discard the message by freeing the CMB; the message is not queued for transmission.