ASXB information

ASXB programming interface information

ONLY the following fields are part of the programming interface information:

Asxb_NoAbdump
ASXBFTCB
ASXBITCB
ASXBLTCB
ASXBLWA
ASXBSENV
ASXBUSER
ASXBUSR8

ASXB heading information

Common name:	Address Space Extension Block
Macro ID:	IHAASXB
DSECT name:	ASXB
Owning component:	Supervisor Control (SC1C5)
Eye-catcher ID:	ASXB Offset: 0 Length: 4
Storage attributes:	Subpool: 255 Key: 0 Residency: Below the 16M line
Size:	Offset of ASXBEND minus the offset of ASXB
Created by:	SYSGEN IEAVEMIN
Pointed to by:	ASCBASXB
Serialization:	LOCAL lock
Function:	Contains information and pointers needed for address space control. The ASXB is swappable, and the ASCB is not.

ASXB mapping

Table 1. Structure ASXB
`Offset Dec`	`Offset Hex`	`Type`	`Len`	`Name(Dim)`	`Description`
`0`	`(0)`	`STRUCTURE`	`0`	`ASXB`	`ADDRESS SPACE EXTENSION BLOCK`
`0`	`(0)`	`DBL WORD`	`8`	`ASXBEGIN(0)`	`- BEGINNING OF ASXB`
`0`	`(0)`	`CHARACTER`	`4`	`ASXBASXB`	`- ACRONYM IN EBCDIC -ASXB-`
`4`	`(4)`	`ADDRESS`	`4`	`ASXBFTCB`	`- POINTER TO FIRST TCB ON TCB QUEUE`
`8`	`(8)`	`ADDRESS`	`4`	`ASXBLTCB`	`- POINTER TO LAST TCB ON TCB QUEUE`
`12`	`(C)`	`SIGNED`	`2`	`ASXBTCBS`	`- NUMBER TCB'S IN THE MEMORY`
`14`	`(E)`	`BITSTRING`	`1`	`ASXBFLG1`	`- Flags`
		`1... ....`		`ASXBHCRM`	`"X'80'" - Health Check AS resmgr set`
`15`	`(F)`	`BITSTRING`	`1`	`ASXBSCHD`	`- SCHEDULER FLAG BYTE`
		`1... ....`		`ASXBSWUP`	`"X'80'" - INDICATES THAT SWA SHOULD BE WRITTEN ABOVE THE LINE FOR THIS ADDRESS SPACE`
`16`	`(10)`	`ADDRESS`	`4`	`ASXBMPST`	`- ADDRESS OF VTAM MEMORY PROCESS SCHEDULING TABLE MDC015`
`20`	`(14)`	`ADDRESS`	`4`	`ASXBLWA`	`- ADDRESS OF LWA MDC016`
`24`	`(18)`	`ADDRESS`	`4`	`ASXBVFVT`	`- POINTER TO INTERNAL VIRTUAL FETCH VECTOR TABLE. OWNERSHIP - VIRTUAL FETCH. SERIALIZATION - LOCAL LOCK.`
`28`	`(1C)`	`ADDRESS`	`4`	`ASXBSAF`	`- ROUTER RRCB ADDRESS`
`32`	`(20)`	`ADDRESS`	`4`	`ASXBIHSA`	`- POINTER TO INTERRUPT HANDLERS SAVE AREA FOR LOCALLY LOCKED INTERRUPTS`
`36`	`(24)`	`SIGNED`	`4`	`ASXBFLSA(18)`	`- SAVE AREA FOR ANY FIRST LEVEL BRANCH ENTRY (MUST BE FIRST USER AFTER LOCAL LOCK IS OBTAINED)`
`108`	`(6C)`	`ADDRESS`	`4`	`ASXBOMCB`	`- POINTER TO OBJECT ACCESS METHOD CONTROL BLOCK`
`112`	`(70)`	`ADDRESS`	`4`	`ASXBSPSA`	`- POINTER TO LOCAL WORK/SAVE AREA VECTOR TABLE`
`116`	`(74)`	`ADDRESS`	`4`	`ASXBRSMD`	`- POINTER TO LOCAL RSM DATA AREA`
`120`	`(78)`	`ADDRESS`	`4`	`ASXBRCTD`	`- POINTER TO LOCAL RCT DATA AREA`
`124`	`(7C)`	`ADDRESS`	`4`	`ASXBDECB`	`- DUMP TASK ECB`
`128`	`(80)`	`ADDRESS`	`4`	`ASXBOUSB`	`- POINTER TO SYSTEM RESOURCES MANAGER (SRM) USER SWAPPABLE BLOCK MDC004`
`132`	`(84)`	`ADDRESS`	`4`	`ASXBCRWK`	`- CHECKPOINT/RESTART WORKAREA POINTER. OWNERSHIP - CHECKPOINT/RESTART. SERIALIZATION - NA.`
`136`	`(88)`	`CHARACTER`	`16`	`ASXBPRG`	`- SVC PURGE I/O PARAMETER LIST MDC003`
`152`	`(98)`	`CHARACTER`	`8`	`ASXBPSWD`	`- USER'S LOGON PASSWORD. IF BLANK, NOT REQUIRED MDC005`
`160`	`(A0)`	`ADDRESS`	`4`	`ASXBSIRB`	`- ADDRESS OF SIRB FOR THIS ADDRESS SPACE MDC010`
`164`	`(A4)`	`ADDRESS`	`4`	`ASXBETSK`	`- ADDRESS OF ERROR TASK FOR THIS ADDRESS SPACE MDC011`
`168`	`(A8)`	`CHARACTER`	`24`	`ASXBAEQ(0)`	`- QUEUE ANCHORS FOR EXIT EFFECTOR'S ASYNCHRONOUS EXIT QUEUES MDC012`
`168`	`(A8)`	`ADDRESS`	`4`	`ASXBFIQE`	`- POINTER TO FIRST IQE MDC006`
`172`	`(AC)`	`ADDRESS`	`4`	`ASXBLIQE`	`- POINTER TO LAST IQE MDC007`
`176`	`(B0)`	`ADDRESS`	`4`	`ASXBFRQE`	`- POINTER TO FIRST RQE MDC008`
`180`	`(B4)`	`ADDRESS`	`4`	`ASXBLRQE`	`- POINTER TO LAST RQE MDC009`
`184`	`(B8)`	`ADDRESS`	`4`	`ASXBFSRB`	`- ADDRESS OF FIRST SRB MDC013`
`188`	`(BC)`	`ADDRESS`	`4`	`ASXBLSRB`	`- ADDRESS OF LAST SRB MDC014`
`192`	`(C0)`	`CHARACTER`	`8`	`ASXBUSR8(0)`	`8-byte version of ASXBUSER`
`192`	`(C0)`	`CHARACTER`	`7`	`ASXBUSER`	`- USER ID FOR WHICH THE JOB OR SESSION IS BEING EXECUTED (MDC306)`
`199`	`(C7)`	`BITSTRING`	`1`		`- Last byte of ASXBUSR8. ASXBSECR and ASXBSFLG are deleted`
`200`	`(C8)`	`ADDRESS`	`4`	`ASXBSENV`	`- ADDRESS OF ACCESS CONTROL ENVIRONMENT ELEMENT (MDC304)`
`204`	`(CC)`	`ADDRESS`	`4`	`ASXBSFRS`	`Address of SSI function request storage. Ownership: SSI Serialization: CS`
`208`	`(D0)`	`SIGNED`	`4`	`ASXBR0D0(0)`	`Reserved as of z/OS 1.11`
`208`	`(D0)`	`DBL WORD`	`8`	`ASXBNSDW_PREZOS11(0)`	`DOUBLEWORD CONTAINING THE NSSA POOL AND SYNCHRONIZATION COUNT. Not set as of z/OS 1.11`
`208`	`(D0)`	`ADDRESS`	`4`	`ASXBNSSA_PREZOS11`	`NSSA POOL. Not set as of z/OS 1.11`
`212`	`(D4)`	`SIGNED`	`4`	`ASXBNSCT_PREZOS11`	`COUNT USED TO SYNCHRONIZE THE NSSA POOL. Not set as of z/OS 1.11`
`212`	`(D4)`	`ADDRESS`	`4`	`ASXBTHTA`	`Address of Task Hash Table`
`216`	`(D8)`	`SIGNED`	`4`	`ASXBCASW(0)`	`- USED BY REGION CONTROL TASK (RCT)/CANCEL VIA CS INSTRUCTION (MDC313)`
`216`	`(D8)`	`BITSTRING`	`1`	`ASXBCRB1`	`- CANCEL/RCT BYTE 1 (MDC314)`
		`1... ....`		`ASXBPIP`	`"X'80'" - SET BY RCT TO INDICATE PURGE (SVC 16) IS IN PROCESS (MDC315)`
		`.1.. ....`		`ASXBTFD`	`"X'40'" - SET BY CANCEL TO INDICATE THAT ALL SUBTASKS OF THE RCT HAVE BEEN SET DISPATCHABLE VIA STATUS (MDC316)`
`217`	`(D9)`	`BITSTRING`	`1`	`ASXBCRB2`	`- CANCEL/RCT BYTE 2 (MDC317)`
`218`	`(DA)`	`BITSTRING`	`1`	`ASXBCRB3`	`- CANCEL/RCT BYTE 3 (MDC318)`
`219`	`(DB)`	`BITSTRING`	`1`	`ASXBCRB4`	`- CANCEL/RCT BYTE 4 (MDC319)`
`220`	`(DC)`	`ADDRESS`	`4`	`ASXBPT0E`	`- POST EXIT QUEUE HEADER (MDC312)`
`224`	`(E0)`	`ADDRESS`	`4`	`ASXBCAPC`	`- Count of task mode UCB capture requests Ownership: IOS Serialization: Local Latch (Local Lock during NIP)`
`228`	`(E4)`	`ADDRESS`	`4`	`ASXBJSVT`	`- JES COMMUNICATION AREA POINTER. OWNERSHIP - JES2/3.`
`232`	`(E8)`	`ADDRESS`	`4`	`ASXBDIVW`	`- ADDRESS OF THE DIV WORK/SAVE AREA, OR ZERO IF NONE EXISTS`
`236`	`(EC)`	`ADDRESS`	`4`	`ASXBCAPT`	`- Pointer to IOS captured UCB object. Ownership: IOS Serialization: Local Latch (Local Lock during NIP)`
`240`	`(F0)`	`ADDRESS`	`4`	`ASXBLINF`	`- Latch information area Ownership: GRS Latch Serialization: LOCAL lock`
`244`	`(F4)`	`ADDRESS`	`4`	`ASXBPIRL`	`Pointer to queue of PIRLs. Ownership: IOS Serialization: local lock.`
`248`	`(F8)`	`ADDRESS`	`4`	`ASXBITCB`	`- Initial jobstep TCB address attached by initiator (IEFSD263) or 0 when no job is running. This field is valid for any address space that goes through full-function start.`
`252`	`(FC)`	`ADDRESS`	`4`	`ASXBRZVP`	`- Address of RZV Control Table Ownership: IOS`
`256`	`(100)`	`ADDRESS`	`4`	`ASXBGRSP`	`- Address of GRS control information for this address space. Ownership: GRS Serialization: CS`
`260`	`(104)`	`ADDRESS`	`4`	`ASXBVASB`	`Address of VASB. Ownership: VSAM Serialization: CS`
`264`	`(108)`	`DBL WORD`	`8`	`ASXBALEC`	`AuthorizedLE Anchor Ownership: LE`
`272`	`(110)`	`DBL WORD`	`8`	`ASXBIFAR(0)`	`Range`
`272`	`(110)`	`ADDRESS`	`4`	`ASXBFXRS`	`Range Start`
`276`	`(114)`	`ADDRESS`	`4`	`ASXBFXRE`	`Range End`
`280`	`(118)`	`ADDRESS`	`4`	`ASXBEXTA`	`Local exits`
`284`	`(11C)`	`ADDRESS`	`4`	`ASXBAXRL`	`AXR local area Ownership: Sysrexx`
`288`	`(120)`	`DBL WORD`	`8`	`ASXB_MAPREQ_ADDR`	`MAPMVS tracking area address`
`296`	`(128)`	`SIGNED`	`4`	`ASXBLCPI`	`Loader CPOOL ID`
`300`	`(12C)`	`SIGNED`	`4`	`ASXBTCBPMEPOOLID`	`Pause Multiple CPOOL ID`
`304`	`(130)`	`BITSTRING`	`8`	`ASXBCMTM`	`Time (via STCK) when CMRO task moves back up the task tree`
		`1... ....`		`ASXBCMTM_BIT0`	`"X'80'" First bit, for windowing`
`312`	`(138)`	`SIGNED`	`4`	`ASXBCNZCPID`	`CPoolId for CNZ`
`316`	`(13C)`	`SIGNED`	`4`	`ASXB_NOABDUMP`	`ABDUMP prevention counter. Increment when you want the system not to allow an ABDUMP. Decrement when it is ok to do an ABDUMP. Field used when exploiter is in the jobstep program task tree. Serialization: CS/ALSI`
`320`	`(140)`	`BITSTRING`	`192`	`ASXBR140`	`Reserved`
`Start of x'200' primarily write cache line`
`512`	`(200)`	`DBL WORD`	`8`	`ASXBNSDW(0)`	`DOUBLEWORD CONTAINING THE NSSA POOL AND SYNCHRONIZATION COUNT.`
`512`	`(200)`	`ADDRESS`	`4`	`ASXBNSSA`	`NSSA POOL.`
`516`	`(204)`	`SIGNED`	`4`	`ASXBNSCT`	`COUNT USED TO SYNCHRONIZE THE NSSA POOL.`
`520`	`(208)`	`BITSTRING`	`248`	`ASXBR208`	`Reserved`
`768`	`(300)`	`DBL WORD`	`8`	`ASXBEND(0)`	`- END OF ASXB`
`768`	`(300)`	`X'10'`	`0`	`ASXBTHT_NUMENTRIES`	`"16" Number of HT entries`
`768`	`(300)`	`X'40'`	`0`	`ASXBTHTL`	`"ASXBTHT_NumEntries*4" Task Hash Table length`
`768`	`(300)`	`X'F000'`	`0`	`ASXBTHT_MASK`	`"(ASXBTHT_NumEntries-1)*4096"`
`768`	`(300)`	`X'C'`	`0`	`ASXBTHT_SHIFT`	`"12" Amount to shift masked value to get the hash index`

Table 2. Cross Reference for ASXB
`Name`	`Offset`	`Hex Tag`
`ASXB`	`0`
`ASXB_MAPREQ_ADDR`	`120`
`ASXB_NOABDUMP`	`13C`
`ASXBAEQ`	`A8`
`ASXBALEC`	`108`
`ASXBASXB`	`0`
`ASXBAXRL`	`11C`
`ASXBCAPC`	`E0`
`ASXBCAPT`	`EC`
`ASXBCASW`	`D8`
`ASXBCMTM`	`130`
`ASXBCMTM_BIT0`	`130`	`80`
`ASXBCNZCPID`	`138`
`ASXBCRB1`	`D8`
`ASXBCRB2`	`D9`
`ASXBCRB3`	`DA`
`ASXBCRB4`	`DB`
`ASXBCRWK`	`84`
`ASXBDECB`	`7C`
`ASXBDIVW`	`E8`
`ASXBEGIN`	`0`
`ASXBEND`	`300`
`ASXBETSK`	`A4`
`ASXBEXTA`	`118`
`ASXBFIQE`	`A8`
`ASXBFLG1`	`E`
`ASXBFLSA`	`24`
`ASXBFRQE`	`B0`
`ASXBFSRB`	`B8`
`ASXBFTCB`	`4`
`ASXBFXRE`	`114`
`ASXBFXRS`	`110`
`ASXBGRSP`	`100`
`ASXBHCRM`	`E`	`80`
`ASXBIFAR`	`110`
`ASXBIHSA`	`20`
`ASXBITCB`	`F8`
`ASXBJSVT`	`E4`
`ASXBLCPI`	`128`
`ASXBLINF`	`F0`
`ASXBLIQE`	`AC`
`ASXBLRQE`	`B4`
`ASXBLSRB`	`BC`
`ASXBLTCB`	`8`
`ASXBLWA`	`14`
`ASXBMPST`	`10`
`ASXBNSCT`	`204`
`ASXBNSCT_PREZOS11`	`D4`
`ASXBNSDW`	`200`
`ASXBNSDW_PREZOS11`	`D0`
`ASXBNSSA`	`200`
`ASXBNSSA_PREZOS11`	`D0`
`ASXBOMCB`	`6C`
`ASXBOUSB`	`80`
`ASXBPIP`	`D8`	`80`
`ASXBPIRL`	`F4`
`ASXBPRG`	`88`
`ASXBPSWD`	`98`
`ASXBPT0E`	`DC`
`ASXBRCTD`	`78`
`ASXBRSMD`	`74`
`ASXBRZVP`	`FC`
`ASXBR0D0`	`D0`
`ASXBR140`	`140`
`ASXBR208`	`208`
`ASXBSAF`	`1C`
`ASXBSCHD`	`F`
`ASXBSENV`	`C8`
`ASXBSFRS`	`CC`
`ASXBSIRB`	`A0`
`ASXBSPSA`	`70`
`ASXBSWUP`	`F`	`80`
`ASXBTCBPMEPOOLID`	`12C`
`ASXBTCBS`	`C`
`ASXBTFD`	`D8`	`40`
`ASXBTHT_MASK`	`300`	`F000`
`ASXBTHT_NUMENTRIES`	`300`	`10`
`ASXBTHT_SHIFT`	`300`	`C`
`ASXBTHTA`	`D4`
`ASXBTHTL`	`300`	`40`
`ASXBUSER`	`C0`
`ASXBUSR8`	`C0`
`ASXBVASB`	`104`
`ASXBVFVT`	`18`