Linkage Conventions of the Exit

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Linkage Conventions of the Exit

CA Compress employs standard MVS linkage conventions when invoking the Security Exit. At entry to the exit:

Register	Description
Register 1	contains the address of the parameter list
Register 13	contains the address of a 72 byte save area
Register 14	contains the return address and caller's AMODE
Register 15	contains the Exit's entry point address

All registers (except 15) must be saved at entry and restored when the exit returns to the Control File Maintenance Utility. Register 15 must contain a return code indicating the security exit's determination.

The exit is called in problem state, user protect key, and the AMODE defined by the link edit attributes.