gtpi1m2j | System Installation Support Reference |
User exit routine UCCLDD issues a Load Display command to update the LED
display on a tape device. UCCLDD is invoked from the exit point LDD,
which is nondynamic, in one of the following routines:
- Routine LOCATEYYY of segment CEDT in CSECT CCCPSE.
- Routine CCDSW100 of segment CEDT in CSECT CCCPSE.
General Conditions at Entry
The registers at entry to UCCLDD are:
- R0
- R0 must have one of the following values:
- X'00'
- Equated to LDDTPSW, indicates the exit was called during system error
processing and came from routine CCDTPSW1 in segment CEDT.
- X'04'
- Equated to LDDYYY, indicates the exit was called during system error
processing and came from routine LOCATEYYY in segment CEDT.
- Note:
- This should be taken into consideration when adding code to the exit.
- R4
- Pointer to the TSTB section 2 entry for the tape device in question
- R6
- Pointer to the TSTB section 1 entry for the tape device in question
- R7
- Pointer to the Load Display workarea located in the calling segment
- R11-R15
- See User Exit Routines - Common Entry Conditions.
System Conditions at Entry
- System state
- Supervisor
- System mask
- Masked
- Protect key
- 0
- Address space
- SVM.
Programming Considerations at Entry
- This routine is invoked during system error processing
- 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
- If the user exit returns condition code zero, either Message 1, Message 2,
or both messages will be displayed.
- If the exit returns a non-zero condition code, no message will be
displayed.