gtpi1m1hSystem Installation Support Reference

Get Block without ECB

User exit routine UCCGBK is invoked by the Get Block Without ECB routine after a core block has been allocated, and before returning to the caller. This exit point, named GBK, can be activated dynamically. Exit point GBK is in copy segment CLHV of CSECT CCSTOR.

General Conditions at Entry

The registers at entry to UCCGBK are:

R1
FCT (Frame Control Table) entry pointer.

R2
SVM address of the storage block.

R3
Address of routine invoking CL$GET01.

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.

Programming Considerations at Entry

  1. No core block management data records can be modified.
  2. 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.