gtpi1m0m | System Installation Support Reference |
User exit routine UCCCFR is used with C language support and is activated
on return from a C library function if the exit point named CFR is
active. Exit point CFR is in CSECT CCLANG.
General Conditions at Entry
The registers at entry to UCCCFR are:
- R7
- C stack pointer.
- R8
- Base address of C program to return to.
- R9
- Address of the ECB.
- R13-R15
- See User Exit Routines - Common Entry Conditions.
System Conditions at Entry
- System state
- Problem
- System mask
- Unmasked
- Protect key
- Working Storage
- Address state
- EVM.
Programming Considerations at Entry
- It is possible to be in Protect key 0, if a CINFC(CINFC_WRITE) was
issued. The protect key can be different from the key at UCCCFC.
- 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.