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User exit linkage conventions z/OS DFSORT Application Programming Guide SC23-6878-00 |
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To enter a user exit, DFSORT loads the address of the DFSORT return point in register 14 and the address of the user exit routine in register 15. A branch to the address in register 15 is then performed. The general registers used by DFSORT for linkage and communication
of parameters observe operating system conventions. When your routine
gets control, the general registers have the following contents:
You can return control to DFSORT by performing a branch to the DFSORT return point address in register 14 or by using a RETURN macro instruction. The RETURN instruction can also be used to set return codes when multiple actions are available at a user exit. Your user exit must save all the general registers it uses. You can use the SAVE macro instruction to do this. If you save registers, you must also restore them; you can do this with the RETURN macro instruction. |
Copyright IBM Corporation 1990, 2014
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