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 7.2.0 Last updated on 24 Jun 2020 at 09:28:17 EDT.
Copyright IBM Corporation, 1990, 2020