Programming the CBRUXSAE exit correctly

CBRUXSAE is provided as a separate load module that must be link-edited into LINKLIB and invoked from OSR by the MVS LINK macro.

CBRUXSAE is invoked in the following state:

Task mode (not SRB)
Non-cross-memory mode (PASN=SASN=HASN)
No MVS locks held
Enabled for I/O and external interrupts
Problem or supervisor state (the state of the invoker of the OSREQ macro interface)
Key of the caller (invoker of the OSREQ macro interface)

CBRUXSAE must meet the following requirements:

31-bit addressing mode
Reentrant
Reusable
Refreshable

Abends incurred by CBRUXSAE are sent to the caller’s recovery routine; no additional ESTAE for this exit is provided. See Sample CBRUXSAE installation exit for a sample of the CBRUXSAE installation exit.