z/OS MVS Using the Subsystem Interface
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Output Register Information

z/OS MVS Using the Subsystem Interface
SA38-0679-00

When control returns to the caller, the general purpose registers contain:
Register
Contents
0
Used as a work register by the system
1
Address of the SSOB control block
2 — 13
Same as on entry to call
14
Return address
15
Return code

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