Usage notes for AMODE 31 applications

The abnormal termination exit must be written in assembler. If you write an abnormal termination exit in Language Environment-enabled assembler, be sure to specify MAIN=NO in the CEENTRY macro.
The abnormal termination exit cannot call any HLL programs.
The abnormal termination exit cannot create a Language Environment enclave.
The abnormal termination exit can use the following Language Environment callable services if the feedback code is passed as a parameter:
- Date and time callable services
- Dynamic storage callable services
- Message handling callable services
- National language support callable services
- A subset of the general callable services: CEE3DMP, CEE3GRC, CEE3PRM
- A subset of the condition handling callable services: CEE3GRN, CEEDCOD, CEEGPID, CEEGQDT, CEEITOK, CEENCOD
In addition, observe the restrictions on the use of system services as described in z/OS Language Environment Programming Guide.
Language Environment issues a system-dependent LOAD for one of the names contained in CEEEXTAN. If the load is successful, the abnormal termination exit is invoked.
Upon return from the abnormal termination exit, Language Environment deletes the routine. A return code is not provided, because Language Environment takes no action (beyond deleting the routine) for a nonzero return code.
If Language Environment intercepts a program check, an ABEND, or a CEESGL while an abnormal termination exit is in control, Language Environment issues an ABEND to terminate the enclave with the abend code 4087 reason code 10.
Entry conditions into the abnormal termination exit:
Register 1

Has a standard OS parameter list as described above.

Register 12

Points to the CAA.

Register 13

Points to a Language Environment DSA with a valid NAB. (You can use it as a standard 18-fullword save area.)

Register 14

Contains the return address.

Register 15

Contains the entry point address.

AMODE

Is 31.
Exit conditions from the abnormal termination exit:
Registers 15–1

Undefined.

Registers 2–13

Unchanged.

Register 14

Is the return point.

AMODE

Is 31.