800

Explanation
During processing of an I/O request, execute channel
program (EXCP) processing encountered an error. Most instances
of the X'800' ABEND code have a reason code that explains
the error. After the pages for a buffer were fixed, an LRA instruction
for a page in the buffer got a nonzero condition code. This means
that page is not valid.Code
Explanation
01
An error occurred during channel program validity
check processing. Either an access protection error or a page fix error
occurred when: The EXCP IDAW routine tried to access the IDAW using an incorrect
storage protection key.
The EXCP CCW validity check routine tried to access the virtual
channel program using an incorrect storage protection key.
The CCW channel program attempted to execute
a restricted operation.
The EXCP zHPF validity check routine tried to access the virtual
channel program using an incorrect storage protection key.
An error occurred during page-fix or page-unfix processing. A
page-fix error can occur if the EXCP processor tries to fix pages
that are not assigned to the caller's address space identifier (ASID).
Note: An access protection or page-fix error can occur when there
is an error in the channel program. Correct the channel program.

02
System error. Search problem reporting databases for a fix for
the problem. If no fix exists, contact the IBM® Support Center.
03
An error occurred during page-fix processing for
a data extent block (DEB) for an EXCP V=R request.
04
A program issued SVC 114, the EXCPVR macro, but an error occurred
during page-fix or page-unfix processing. A page-fix error can occur
if the EXCP processor tries to fix pages that are not assigned to
the caller's ASID.
05
The IOBE specified that 64-bit IDAWs are to be used for an EXCPVR
request, but they are not supported by the hardware.
06
The IOBE specified that 64-bit IDAWs are to be used for an EXCPVR
request but they are not supported by the device support code
07
The IOBE specified that format 1 CCWs are to be used for an EXCP
request, but format 1 CCWs are only supported with EXCPVR requests.
08
The IOBE specified that MIDAWs are to be used for an EXCP request,
but MIDAWs are only supported with EXCPVR requests.
09
The IOBE specified that this is a zHPF channel program request,
but zHPF channel programs are only supported for EXCPVR and EXCP virtual requests for non-VIO data sets. They are not
supported for VIO data sets or EXCP V=R requests.
0A
A zHPF channel program request specified a TCW that is not on
a 64-byte boundary.
0B
A zHPF channel program request used a TIDAL to point to the TCCB.
0C
A zHPF channel program request specified a TCW that contained
a non-zero value for the TSB pointer or the interrogate TCW pointer.
0D
A zHPF channel program for an EXCP virtual request specified a
TCCB that crossed a page boundary.
0E
The number of virtual TIDAWs in a zHPF channel program
has exceeded the maximum allowed value (65,536).  This can occur due
to an error in the channel program.  For example:A virtual TIDAW in the list is linked to a previous virtual TIDAW
causing a loop.
An incorrect TIDAL virtual storage address is specified in the
TCW.
The last virtual TIDAW in the list does not have the last TIDAW
in the list flag turned on.

System action
The system abnormally ends the current task. The
system writes a logrec data set error record and issues a system dump.

System programmer response
In the dump, look at field TCBEXCPD
at offset X'C0' in the task control block (TCB) for the current
task.  TCBEXCPD points to the EXCP debugging area (XDBA). The XDBA
contains diagnostic data associated with the EXCP processor.
If
the error recurs and the program is not in error, look at the messages
in the job log for more information. Search problem reporting data
bases for a fix for the problem. If no fix exists, contact the IBM Support Center. Provide the
logrec data set error record, the JCL for the job, and the SNAP dump.

Programmer response
Correct the problem that the reason code
indicates.
If you get reason code 3 or 4, or if the error cannot
be determined, run the job again, requesting an ABEND dump.  Notify
the system programmer.

Source
Execute channel program (EXCP)