MCFBK Back to Index page
 
Prolog 
Control Block Contents 
   MCFBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  MCFBK Prolog Top of page
 
 NAME       : HCPMCFBK
 DESCRIPTION: Trace Service Tool Monitor Call Trace
              Record Header Format Block
 DSECT      : MCFBK
 FUNCTION   : Overlay for the header of the trace records
              passed to CP via Monitor call class 10
              instructions.
  mployed By -
              HCPTSCGT - Monitor Class 10 Event Handler
              HCSTSF   - Finalize a trace to DASD
              HCSTSG   - Trace services logoff processing
              HCSTSM   - Trace Reduction
 LOCATED BY : local pointer in HCPTSC and HCPTSR
 CREATED BY : MCFTSC
 DELETED BY : MCFTSC
 REFERENCES : None
 RELOCATION CONSIDERATIONS : None
 COMMENTS   :
              This is a variable length control block.
              This control block must provide the same mapping
              as HCPDTFBK.
              If the length of this block increases, compile HCPTSR
              to make sure that the change does not cause the Guest
              Trace data maximum to become invalid.
 
 
  MCFBK Control Block Content Top of page
 

 MCFBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure MCFBK Trace Service Tool Monitor Call Trace 0000 0 Bitstring 8 MCFHEADER (0) Record header 0000 0 Signed 2 MCFRLNGT Length of trace record 0002 2 Signed 2 * Reserved for IBM USE 0004 4 Signed 2 MCFINDIV Individualizing code 0006 6 Bitstring 1 MCFTYPE Type of trace event 0007 7 Bitstring 1 * Reserved for IBM USE 0008 8 Character 8 MCFTOD TOD Clock value 0010 16 Bitstring 1 MCFDATA (0) Trace data passed from the guest - up to 4000 bytes
 
 
  MCFBK Storage Layout Top of page
 
          
*** MCFBK - Trace Service Tool Monitor Call Trace
*
*     +-------------+-------------+-------------+------+------+
*   0 |  MCFRLNGT   |/////////////|  MCFINDIV   |:TYPE |//////|
*     +-------------+-------------+-------------+------+------+
*   8 |                        MCFTOD                         |
*     +-------------------------------------------------------+
*
*** MCFBK - Trace Service Tool Monitor Call Trace
 
 
  MCFBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
MCFDATA        0010
MCFHEADER      0000
MCFINDIV       0004
MCFRLNGT       0000
MCFTOD         0008
MCFTYPE        0006
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:29:06 EDT.
Copyright IBM Corporation, 1990, 2020