The EAX for recovery routines defined through the ESTAE macro, the ESTAEX macro, or the ESTAI parameter on ATTACHX is the same as when the macro was issued.
For FESTAE routines, the EAX is the same as when the SVC routine that defined the FESTAE routine was entered.
For ARRs, the EAX is the same as when the stacking PC routine was entered.
Refer to the information on access registers in z/OS MVS Programming: Extended Addressability Guide for more information about the EAX.