FRHBK Back to Index page
 
Prolog 
Control Block Contents 
   FRHBK 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.


  FRHBK Prolog Top of page
  
 NAME       : HCPFRHBK
 DESCRIPTION: Function-Related trace table vector header
 DSECT      : FRHBK
 FUNCTION   : This control block defines the header entry of the
              function related trace table vector. It is the first 64
              byte slot in a page of vector entries. The remainder of
              page is mapped by HCPFRTBK.
 LOCATED BY : HCPFRTAN - Function-Related Vector Anchor
 CREATED BY : HCPFRTOP - When the first FR trace vector page is
              obtained.
 DELETED BY : (never deleted)
 REFERENCES :
 SERIALIZED :
 COMPATIBILITY AND MIGRATION CONCERNS :
 RELOCATION CONSIDERATIONS : None
 NOTES      : FRHBK must be 64 bytes in length, as it is the first
              64 byte slot in a page of 64 byte FRTBKs.
 
 
  FRHBK Control Block Content Top of page
  




 FRHBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      FRHBK          Function-Related trace table vector header
0000    0 Address      4 FRHNEXT        Chain to next vector page
0004    4 Address      4 FRHEMPTY       Addr of first empty entry
          FRHEMPTY       FRHBNDRY       X'F000' FRHBNDRY Used to AND @
                                        down to pg bndry
0008    8 Signed       2 *              Reserved for IBM Use
000C   12 Signed       4 * (13)         Reserved for IBM Use
          00000040       FRHBSIZE       (*-FRHBK) Size in Bytes
          00000008       FRHSIZE        (*-FRHBK+7)/8 Size in Double
                                        words
 
 
  FRHBK Storage Layout Top of page
  
          
*** FRHBK - Function-Related trace table vector header
*
*     +---------------------------+---------------------------+
*   0 |         FRHNEXT           |         FRHEMPTY          |
*     +-------------+-------------+---------------------------+
*   8 |/////////////|/////////////|///////////////////////////|
*     +-------------+-------------+///////////////////////////|
*  10 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  40
*
*** FRHBK - Function-Related trace table vector header
 
 
  FRHBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
FRHBNDRY       0004 FRHEMPTY
FRHBSIZE       000C 00000040
FRHEMPTY       0004
FRHNEXT        0000
FRHSIZE        000C 00000008
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:50:39 EDT.
Copyright IBM Corporation, 1990, 2022