z/OS DFSMStvs Administration Guide
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Register contents

z/OS DFSMStvs Administration Guide
GC52-1388-00

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. 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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