Registers at entry to the user exit routine

z/OS MVS Program Management: Advanced Facilities

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Registers at entry to the user exit routine

z/OS MVS Program Management: Advanced Facilities
SA23-1392-00

A user exit routine is called using MVS™ linkage conventions:

Register 1 contains the address of the parameter list.
Register 13 contains the address of an 18-word register save area.
Register 14 contains the return address to the binder.
Register 15 contains the address of the exit routine's entry point.

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