gtpi1m2e | System Installation Support Reference |
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
- 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.
- Bits 16-31 of R8 contain the fast-link case number, offset by
decimal 16. To obtain the actual case number, subtract 16.
- 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.