ANCHSECT

Prolog  

Control Block Contents  
   ANCHSECT DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

ANCHSECT Prolog

 Name       : ANCHTAB
 Description: Anchor Table
 DSECT      : ANCHSECT
 Function   : ANCHSECT defines the VSE anchor table. This
              DSECT is used by DMSDOS when a CDLOAD (SVC 65)
              is issued, and the specified phase is not found
              in either the CMSVSAM or CMSAMS segment. In
              this case, the specified phase is loaded either
              from a CMS DOSLIB or a VSE core image library,
              and the name, load point, entry point and
              length in bytes of the phase are saved in an
              available slot in the anchor table. ANCHSECT is
              called by the ANCHTAB macro.

ANCHSECT Control Block Content

ANCHSECT DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      ANCHSECT       Anchor Table
      BEGINNING OF AN ANCHOR-TABLE:
0000    0 Address      4 ANCHENDA       END ADDRESS OF ANCHOR TABLE
0004    4 Address      4 ABCHLUB        Dynamic Assign Table
0008    8 Address      4 ANCHCBS        POINTER TO VSAM "AMCB" TABLE
000C   12 Address      4 ANCHOAL        POINTER TO VSAM "OAL" (OPEN ACB)
                                        TABLE
0010   16 Address      4 ANCHCCRB       Compression Serv Root Block Ptr.
0014   20 Address      4 ANCHCCGT       Compression Services Gate Word
0018   24 Signed       4 * (26)         Reserved area for VSAM use
      FOLLOWED BY ONE OR MORE ANCHOR-TABLE ENTRIES OF THE FOLLOWING FORMAT:
0080  128 Character    8 ANCHPHNM       PHASE NAME
0088  136 Address      4 ANCHLDPT       LOAD POINT
008C  140 Address      4 ANCHENTP       ENTRY POINT
0090  144 Bitstring    1 ANCHSTSW       STATUS SWITCH
0091  145 Address      3 ANCHPHLN       LENGTH OF PHASE IN BYTES
      Allocate space for 43 more 20 byte anchor table entries.
0094  148 Signed       4 * (219)        Dynamic Fetch Entries, each 20
                                        bytes, (CMS only).
      ANCHSTSW DEFINITIONS:
          .... ....      ANCHMLOD       X'00' PHASE MUST BE LOADED
          .111 1111      ANCHINST       X'7F' PHASE IS ALREADY IN STORAGE
          1111 1111      ANCHRPJL       X'FF' REQUESTED PHASE JUST LOADED
                                        BY ANOTHER TASK (ONLY IF AP=YES)
          00000014       ANCHLENG       20 LENGTH OF ONE ANCHOR-TABLE
                                        ENTRY
          00000400       ANCHSIZ        1024 DEFAULT SIZE OF ANCHOR TABLE
                                        (IN BYTES)

ANCHSECT Storage Layout

          
*** ANCHSECT - Anchor Table
*
*     +---------------------------+---------------------------+
*   0 |         ANCHENDA          |         ABCHLUB           |
*     +---------------------------+---------------------------+
*   8 |         ANCHCBS           |         ANCHOAL           |
*     +---------------------------+---------------------------+
*  10 |         ANCHCCRB          |         ANCHCCGT          |
*     +---------------------------+---------------------------+
*  18 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  80 |                       ANCHPHNM                        |
*     +---------------------------+---------------------------+
*  88 |         ANCHLDPT          |         ANCHENTP          |
*     +------+--------------------+---------------------------+
*  90 |:HSTSW|     ANCHPHLN       |///////////////////////////|
*     +------+--------------------+///////////////////////////|
*  98 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 400
*
*** ANCHSECT - Anchor Table

ANCHSECT Cross Reference

Symbol         Dspl Value
-------------- ---- -----
ABCHLUB        0004
ANCHCBS        0008
ANCHCCGT       0014
ANCHCCRB       0010
ANCHENDA       0000
ANCHENTP       008C
ANCHINST       0094 7F
ANCHLDPT       0088
ANCHLENG       0094 00000014
ANCHMLOD       0094 00
ANCHOAL        000C
ANCHPHLN       0091
ANCHPHNM       0080
ANCHRPJL       0094 FF
ANCHSIZ        0094 00000400
ANCHSTSW       0090