Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
XITBK
Control Block Contents
XITBK DSECT
Cross Reference (Contains links to field and bit definitions)
XITBK Prolog
Name : HCPXITBK Description: CP Exit Block DSECT : XITBK Function : This control block contains information used to authorize user exit routines to find their entry points. Located by : Radix tTree structure anchored by XCTBK.XCTRADIX. Created by : HCPZXUAD Deleted by : none
XITBK Control Block Content
XITBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure XITBK CP Exit Block 0000 0 Dbl-Word 8 XITUSRD1 Reserved for non-IBM use 0008 8 Dbl-Word 8 XITUSRD2 Reserved for non-IBM use 0010 16 Signed 4 XITUSRF1 Reserved for non-IBM use 0014 20 Signed 4 XITUSRF2 Reserved for non-IBM use 0018 24 Signed 2 XITUSRH1 Reserved for non-IBM use 001A 26 Signed 2 XITUSRH2 Reserved for non-IBM use 001C 28 Bitstring 1 XITUSRX1 Reserved for non-IBM use 001D 29 Bitstring 1 XITUSRX2 Reserved for non-IBM use 001E 30 Bitstring 1 XITUSRX3 Reserved for non-IBM use 001F 31 Bitstring 1 XITUSRX4 Reserved for non-IBM use 0020 32 Dbl-Word 8 XITXCRLK (3) Lock word to serialize manipulations of the XCRBK chain 0038 56 Bitstring 2 * Reserved 003A 58 Bitstring 2 XITCODE Exit number 003C 60 Signed 4 XITSWAP1 A label for Compare-and-Swap 0040 64 Address 4 XITPUSHD Address of PUSHed XITBK 0044 68 Signed 4 * Reserved 0048 72 Signed 4 XITCALLS Count of calls to this exit 004C 76 Signed 4 XITRETNS Count of returns 0050 80 Address 4 XITXCRBK Address of list of XCRBKs 0054 84 Address 4 XITDEDBK Address of DEDBK 0058 88 Signed 8 XITMSACT Time (in micro-seconds) that . the routines that comprise . this exit were active. 0060 96 Dbl-Word 8 XIT$END (0) End on a dword 003C 60 Bitstring 1 XITFLAG1 A byte of bits ...1 .... XITENABL X'10' This exit has been enabled .... 1... XITRESOL X'08' Resolve exit when associated 003D 61 Bitstring 1 XITFLAG2 A byte of bits 003E 62 Bitstring 2 * Reserved
XITBK Storage Layout
*** XITBK - CP Exit Block * * +-------------------------------------------------------+ * 0 | XITUSRD1 | * +-------------------------------------------------------+ * 8 | XITUSRD2 | * +---------------------------+---------------------------+ * 10 | XITUSRF1 | XITUSRF2 | * +-------------+-------------+------+------+------+------+ * 18 | XITUSRH1 | XITUSRH2 |:USRX1|:USRX2|:USRX3|:USRX4| * +-------------+-------------+------+------+------+------+ * 20 | | * = XITXCRLK = * | | * +-------------+-------------+---------------------------+ * 38 |/////////////| XITCODE | XITSWAP1 | * +-------------+-------------+---------------------------+ * 40 | XITPUSHD |///////////////////////////| * +---------------------------+---------------------------+ * 48 | XITCALLS | XITRETNS | * +---------------------------+---------------------------+ * 50 | XITXCRBK | XITDEDBK | * +---------------------------+---------------------------+ * 58 | XITMSACT | * +-------------------------------------------------------+ * *** XITBK - CP Exit Block *** Overlay for XITSWAP1 in XITBK * * +------+------+-------------+ * 38 ... 3C |:FLAG1|:FLAG2|/////////////| * +------+------+-------------+ * 40 * *** Overlay for XITSWAP1 in XITBK
XITBK Cross Reference
Symbol Dspl Value -------------- ---- ----- XIT$END 0060 XITCALLS 0048 XITCODE 003A XITDEDBK 0054 XITENABL 003C 10 XITFLAG1 003C XITFLAG2 003D XITMSACT 0058 XITPUSHD 0040 XITRESOL 003C 08 XITRETNS 004C XITSWAP1 003C XITUSRD1 0000 XITUSRD2 0008 XITUSRF1 0010 XITUSRF2 0014 XITUSRH1 0018 XITUSRH2 001A XITUSRX1 001C XITUSRX2 001D XITUSRX3 001E XITUSRX4 001F XITXCRBK 0050 XITXCRLK 0020
Last updated on 5 Jun 2001 at 17:21:15 EDT.
Copyright IBM Corporation, 1990, 2001