gtpi1m1i | System Installation Support Reference |
User exit routine UCCGCB is invoked by the Get Common Block routine after a
common block has been allocated and before returning to the caller.
This exit point, named GCB, can be activated dynamically.
Exit point GCB is in copy segment CLHV of CSECT CCSTOR.
General Conditions at Entry
The registers at entry to UCCGCB are:
- R1
- CCT (Common Block Control Table) entry pointer.
- R2
- SVM address of the common block.
- R3
- Address of routine invoking CL$GCOMC.
- R11-R15
- See User Exit Routines - Common Entry Conditions.
System Conditions at Entry
- System state
- Supervisor
- System mask
- Masked for I/O interrupts
- Protect key
- 0
- Address Space
- SVM or EVM.
Programming Considerations at Entry
- No core block management data records can be modified.
- The exit point can be invoked in either the SVM or the EVM. Because
the block address is common to both address spaces, an address space flag is
not supplied or needed.
- 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.