gtpi1m2fSystem Installation Support Reference

TPFDF Macro Trace Return

User exit routine UCCDFFR is invoked by copy segment UFZ0 of CSECT CCNUCL on return from each TPFDF fast-link case. This exit point, DFFR, can be activated dynamically, and is in copy segment CUSR of CSECT CCUEXT.

General Conditions at Entry

The registers at entry to UCCDFFR are:

R0-R8
Contents as set by the fast-link case on exit.

R9
Address of the ECB.

R10
Unknown.

R11-R15
See User Exit Routines - Common Entry Conditions.

System Conditions at Entry

System state
Problem

System mask
Unmasked

Protect key
Working storage

Address Space
EVM.

Programming Considerations at Entry

See User Exit Routines - Common Programming Considerations for other considerations.

Programming Considerations on Return

See User Exit Routines - Common Return Conditions.

General Conditions on Return

See User Exit Routines - Common Return Conditions.