To create an abnormal termination exit:

1. Create an assembler language routine that conforms to the syntax described in z/OS Language Environment Programming Guide or z/OS Language Environment Programming Guide for 64-bit Virtual Addressing Mode. AMODE 64 abnormal termination exit routines should specify the "FETCHABLE=RENT" option on the CELQPRLG MACRO. See CEEWQATX in CEE.SCEESAMP for an example to use with AMODE 64 applications.
2. Assemble and link-edit your exit into a library that Language Environment can access at runtime, such as SCEERUN or SCEERUN2.
3. Code a CEEEXTAN CSECT that contains a CEEXART macro identifying your exit. The macro specifies your routine as an abnormal termination exit routine. The CEEEXTAN CSECT can be found in source file CEECXTAN (for CICS®), CEEEXTAN (for non-CICS), or CELQXTAN (for AMODE 64). See CEEEXTAN abnormal termination exit CSECT for more information.
4. Replace the existing CEEEXTAN CSECT with the updated CEEEXTAN as described in the following sections.