gtpi1m1gSystem Installation Support Reference

Get Block With ECB

User exit routine UCCGBE is invoked by the Get Block With ECB routine after a core block has been allocated, and before returning to the caller. This exit point, named GBE, can be activated dynamically. Exit point GBE is in copy segment CLHV of CSECT CCSTOR.

General Conditions at Entry

The registers at entry to UCCGBE are:

R1
FCT (Frame Control Table) entry pointer.

R2
EVM address of the storage block.

R3
Address of routine invoking CL$GET02.

R4
Pointer to address space flag.
Note:
Equates have been provided to test the address space flag. See the user exit prologue in CUSR for more detailed information.

R9
Address of the associated ECB.

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

  1. No core block management data records can be modified.
  2. The exit point can be invoked in either the SVM or the EVM.
  3. The ECB address, in R9, will be consistent with the address space.
  4. 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.