gtpi1m1j | System Installation Support Reference |
User exit routine UCCGSB is invoked by the Get System Work Block routine
after a system work block has been allocated, and before returning to the
caller. This exit point, named GSB, can be activated
dynamically.
Exit point GSB is in copy segment CLHV of CSECT CCSTOR.
General Conditions at Entry
The registers at entry to UCCGSB are:
- R1
- SCT (SWB Control Table) entry pointer.
- R2
- SVM address of the system work block.
- R3
- Address of routine invoking CL$GSWBC.
- 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. Since
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.