gtpi1m2eSystem Installation Support Reference

TPFDF Macro Trace Call

User exit routine UCCDFFC is invoked by copy segment UFZ0 of CSECT CCNUCL before the invocation of each TPFDF fast-link case. This exit point, DFFC, can be activated dynamically and is in copy segment CUSR of CSECT CCUEXT.

General Conditions at Entry

The registers at entry to UCCDFFC are:

R0-R7
Contents as set by the program executing the fast-link call.

R8
Program index (bits 0-15) and case index (bits 16-31).

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

  1. Bits 0-15 of R8 contain the fast-link segment index. See data macro IFLDDF for a mapping of the index number to the segment name.
  2. Bits 16-31 of R8 contain the fast-link case number, offset by decimal 16. To obtain the actual case number, subtract 16.
  3. 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.