z/OS DFSMS Using Data Sets
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Register Contents

z/OS DFSMS Using Data Sets
SC23-6855-00

Table 1 shows the register contents passed by VSAM when the UPAD exit routine is entered.

Table 1. Contents of registers at entry to UPAD exit routine
Register Contents
0 Unpredictable.
1 Address of a parameter list built by VSAM.
2-12 Unpredictable.
13 Reserved.
14 Return address to VSAM.
15 Entry address of the UPAD routine.
Parent topic: UPAD Exit Routine for User Processing

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