Language Environment common anchor area

Each thread is represented by a common anchor area (CAA). It is the central communication area for the environment. All thread- and enclave-related resources are anchored, provided for, or can be obtained through the CAA. The CAA is generated during thread initialization and deleted during thread termination. The CAA points to the encompassing Enclave Data Block (EDB).

The CAA is addressed by R12 when calling Language Environment-participating external routines. This requirement is relaxed when calling internal routines within a given HLL.

Fields in the CAA should be used as described in other topics of this information. In particular, fields should not be modified and routine addresses should not be used as entry points, except as specified. Fields marked reserved exist for migration of specific languages, or internal use by Language Environment. Their location in the CAA is defined by Language Environment, but their use is not. They should be neither used nor referenced except as specified by the language that defines them.

The following tables show the format of the CAA:

Table 1 shows the CAA field descriptions.
Table 2 shows the CAA constants.
Table 3 shows the CAA cross reference information.

Table 1. Common anchor area (CAA) field descriptions
Offsets		Type	Len	Name (Dim) ( * = Reserved)	Description
Dec	Hex	Type	Len	Name (Dim) ( * = Reserved)	Description
0	(0)	STRUCTURE	976	CEECAA	CAA mapping
0	(0)	CHARACTER	976	CEECAA_EXTERNAL	External portion
0	(0)	BITSTRING	1	CEECAAFLAG0	CAA Flags
		`1111 11..`		*	Reserved
		`.... ..1.`		CEECAAXHDL	Bypass exception handling
		`.... ...1`		*	Reserved
1	(1)	BITSTRING	1	*	Reserved
		`11.. ....`		*	Reserved
		`..1. ....`		CEECAADBGINIT	Debugger is init'd
		`...1 1111`		*	Reserved
2	(2)	BITSTRING	1	CEECAALANGP	PL/I Compatibility flags
		`1111 ....`		*	Reserved
		`.... 1...`		CEECAATHFN	If set, NO PL/I FINISH on-unit is active
		`.... .111`		*	Reserved
3	(3)	CHARACTER	5	*	Reserved
8	(8)	ADDRESS	4	CEECAABOS	Start of current storage seg
12	(C)	ADDRESS	4	CEECAAEOS	End of current storage seg
16	(10)	CHARACTER	52	*	Reserved
68	(44)	SIGNED	4	CEECAATORC	Thread level ret code
68	(44)	SIGNED	2	*
70	(46)	SIGNED	2	CEECAATURC
72	(48)	CHARACTER	44	*	Reserved
116	(74)	ADDRESS	4	CEECAATOVF	Stack overflow rtn
120	(78)	CHARACTER	168	*	Reserved
288	(120)	ADDRESS	4	CEECAAATTN	Addr of CEL attention handler
292	(124)	CHARACTER	56	*	Reserved
348	(15C)	ADDRESS	4	CEECAAHLLEXIT	Set by CEEBINT
Debugger controls
352	(160)	CHARACTER	56	*	Reserved
408	(198)	BITSTRING	12	CEECAAHOOK	Code to pass control to the debugger
420	(1A4)	ADDRESS	4	CEECAADIMA	A(debugger entry)
Each of the following hook switches will contain: `DS X'0700',S(CEECAAUDHOOK)` When the hook switch is activated, the X'0700' is changed to X'45C0', so it becomes: `BAL 12,CEECAAUDHOOK`
424	(1A8)	CHARACTER	72	CEECAAHOOKS	Hook control words for debug
424	(1A8)	CHARACTER	4	CEECAAALLOC	ALLOCATE descr. built
428	(1AC)	CHARACTER	4	CEECAASTATE	New statement begins
432	(1B0)	CHARACTER	4	CEECAAENTRY	Block entry
436	(1B4)	CHARACTER	4	CEECAAEXIT	Block exit
440	(1B8)	CHARACTER	4	CEECAAMEXIT	Multiple block exit
444	(1BC)	CHARACTER	32	CEECAAPATHS	PATH hooks
444	(1BC)	CHARACTER	4	CEECAALABEL	At a label constant
448	(1C0)	CHARACTER	4	CEECAABCALL	Before CALL
452	(1C4)	CHARACTER	4	CEECAAACALL	After CALL
456	(1C8)	CHARACTER	4	CEECAADO	DO block starting
460	(1CC)	CHARACTER	4	CEECAAIFTRUE	True part of IF
464	(1D0)	CHARACTER	4	CEECAAIFFALSE	False part of IF
468	(1D4)	CHARACTER	4	CEECAAWHEN	WHEN group starting
472	(1D8)	CHARACTER	4	CEECAAOTHER	OTHERWISE group
476	(1DC)	CHARACTER	4	CEECAACGOTO	GOTO hook for C
480	(1E0)	CHARACTER	4	CEECAARSVDH1	Reserved hook
484	(1E4)	CHARACTER	4	CEECAARSVDH2	Reserved hook
488	(1E8)	CHARACTER	4	CEECAAMULTEVT	Multiple event hook
492	(1EC)	CHARACTER	4	CEECAAMEVMASK	Multiple event hook mask
496	(1F0)	CHARACTER	80	CEECAAMEMBER_AREA
496	(1F0)	CHARACTER	4	CEECAACGENE	C/370™ CGENE
500	(1F4)	ADDRESS	4	CEECAACRENT	C or C++ writable static
504	(1F8)	CHARACTER	8	CEECAACFLTINIT	Convert fixed to float cfltinit is used by compiled code
512	(200)	ADDRESS	4	CEECAACPRMS	Parameters passed to IBMBLIIA cprms is reference by user's code offset: 4*128
516	(204)	SIGNED	4	CEECAAC_RTL	Combination of 24 unique C/370 trc types & 8 common trc types
520	(208)	ADDRESS	4	CEECAACTHD	C/370 CTHD
524	(208)	ADDRESS	4	CEECAACURRFECB
528	(210)	ADDRESS	4	CEECAAEDCV	C/C++ runtime library vector table
532	(214)	ADDRESS	4	CEECAACPCB	Reserved
536	(218)	ADDRESS	4	CEECAACEDB	C/370 CEDB
540	(21C)	CHARACTER	3	*	Reserved
543	(21F)	CHARACTER	1	CEECAASPCFLAG3	Used for SPC
544	(220)	ADDRESS	4	CEECAACIO	Address of cio
548	(224)	CHARACTER	4	CEECAAFDSETFD	Used by FD_* macros
552	(228)	CHARACTER	2	CEECAAFCBMUTEXOK
554	(22A)	CHARACTER	2	*	Reserved
556	(22C)	CHARACTER	4	CEECAATC16
560	(230)	SIGNED	4	CEECAATC17
564	(234)	ADDRESS	4	CEECAAEDCOV	C/370 Open Libvec
568	(238)	SIGNED	4	CEECAACTOFSV
572	(23C)	ADDRESS	4	CEECAATRTSPACE	C/370 Open Libvec
576	(240)	CHARACTER	24	*	Reserved
600	(258)	CHARACTER	36	CEECAA_TCASRV	TCA Service Rtn Vctr
600	(258)	ADDRESS	4	CEECAA_TCASRV_USERWORD
604	(25C)	ADDRESS	4	CEECAA_TCASRV_WORKAREA
608	(260)	ADDRESS	4	CEECAA_TCASRV_GETMAIN
612	(264)	ADDRESS	4	CEECAA_TCASRV_FREEMAIN
616	(268)	ADDRESS	4	CEECAA_TCASRV_LOAD
620	(26C)	ADDRESS	4	CEECAA_TCASRV_DELETE
624	(270)	ADDRESS	4	CEECAA_TCASRV_EXCEPTION
628	(274)	ADDRESS	4	CEECAA_TCASRV_ATTENTION
632	(278)	ADDRESS	4	CEECAA_TCASRV_MESSAGE
636	(27C)	CHARACTER	4	*	Reserved
640	(280)	ADDRESS	4	CEECAALWS	Addr of PL/I LWS
644	(284)	ADDRESS	4	CEECAASAVR	Register save
648	(288)	CHARACTER	36	*	Reserved
684	(2AC)	BITSTRING	1	CEECAASYSTM	Underlying Op Sys
685	(2AD)	BITSTRING	1	CEECAAHRDWR	Underlying Hardware
686	(2AE)	BITSTRING	1	CEECAASBSYS	Underlying Subsystem
687	(2AF)	BITSTRING	1	CEECAAFLAG2
		`1... ....`		CEECAABIMODAL	Bimodal addressing
		`.1.. ....`		CEECAA_VECTOR	Vector hardware avail
		`..1. ....`		CEECAATIP	Thread terminating
		`...1 ....`		CEECAA_THREAD_INITIAL	Initial thread
		`.... 1...`		CEECAA_TRACE_ACTIVE	Library trace is active (the TRACE runtime option was set)
		`.... .1..`		CEECAA_ALTSTK_ACTIVE	Alternate stack active
		`.... ..1.`		CEECAA_ENQ_WAIT_ INTERRUPTABLE
		`.... ...1`		CEECAA_USRSTK_ACTIVE	C-RTL context switching user stack active
688	(2B0)	UNSIGNED	1	CEECAALEVEL	CEL level identifier
689	(2B1)	BITSTRING	1	CEECAA_PM	Image of current program mask
690	(2B2)	BIT (16)	2	CEECAA_INVAR	Field that is at the same fixed offset in 31-bit and 64-bit CAAs
691	(2B3)	BIT		*	Reserved.
692	(2B4)	ADDRESS	4	CEECAAGETLS	Addr of CEL library stack mgr
696	(2B8)	ADDRESS	4	CEECAACELV	Addr of CEL LIBVEC
700	(2BC)	ADDRESS	4	CEECAAGETS	Addr of CEL get stack stg rtn
704	(2C0)	ADDRESS	4	CEECAALBOS	Start of library stack stg seg
708	(2C4)	ADDRESS	4	CEECAALEOS	End of library stack stg seg
712	(2C8)	ADDRESS	4	CEECAALNAB	Next available byte of lib stg
716	(2CC)	ADDRESS	4	CEECAADMC	Addr ESPIE Devil-May-Care rtn
720	(2D0)	SIGNED	4	CEECAACD	Most recent ABEND completion code
720	(2D0)	SIGNED	4	CEECAAABCODE
724	(2D4)	SIGNED	4	CEECAARS	Most recent ABEND reason code
724	(2D4)	SIGNED	4	CEECAARSNCODE
728	(2D8)	ADDRESS	4	CEECAAERR	Addr of the current CIB
732	(2DC)	ADDRESS	4	CEECAAGETSX	Addr of CEL stack stg extender
736	(2E0)	ADDRESS	4	CEECAADDSA	Addr of the dummy DSA
740	(2E4)	SIGNED	4	CEECAASECTSIZ	Vector Section Size
744	(2E8)	SIGNED	4	CEECAAPARTSUM	Vector Partial Sum Number
748	(2EC)	SIGNED	4	CEECAASSEXPNT	Log of Vector Section Size
752	(2F0)	ADDRESS	4	CEECAAEDB	A(EDB)
756	(2F4)	ADDRESS	4	CEECAAPCB	A(PCB)
The following two fields are used for validation of the CAA.
760	(2F8)	ADDRESS	4	CEECAAEYEPTR	Addr of CAA eyecatcher
764	(2FC)	ADDRESS	4	CEECAAPTR	Addr of this CAA
768	(300)	ADDRESS	4	CEECAAGETS1	DSA alloc - R13 not DSA addr
772	(304)	ADDRESS	4	CEECAASHAB	ABEND shunt routine address
776	(308)	ADDRESS	4	CEECAAPRGCK	Pgm interrupt code for CAADMC
780	(30C)	BITSTRING	1	CEECAAFLAG1	CAA Flags 1
		`1... ....`		CEECAASORT	Call to DF/SORT is active
		`.1.. ....`		CEECAA_USE_OLD_STK	Use old stack
		`..1. ....`		CEECAACICS_EXT_REG	ERTLI CICS® extended register interface in effect
		`...1 ....`		CEECAASHAB_RECOVER_IN_ESTAE_MODE	When ON, Language Environment® will set up for retry to the abend shunt routine only if the PSW key that was in effect at the time the Language Environment ESTAE or user-provided error recovery routine was established matches the IPK result stored in CEECAASHAB_KEY.
		`.... 1...`		*	Reserved
		`.... .1..`		CEECAA_FETCH_RELES_IN_PROGRESS	CEEFETCH or CEERELES in progress on this thread.
		`.... ..11`		*	Reserved
781	(30D)	CHARACTER	1	CEECAASHAB_KEY	IPK result when CEECAASHAB is set.
782	(30E)	CHARACTER	2	*	Reserved
784	(310)	SIGNED	4	CEECAAURC	Thread level return code
The following four fields are for FASTLINK capability.
788	(314)	ADDRESS	4	CEECAAESS	End of current user stack
792	(318)	ADDRESS	4	CEECAALESS	End of current library stack
796	(31C)	ADDRESS	4	CEECAAOGETS	Overflow user seg from FASTLINK
800	(320)	ADDRESS	4	CEECAAOGETLS	Overflow lib seg from FASTLINK
The following field contains the Pre-Init Compatibility Control Block address.
804	(324)	ADDRESS	4	CEECAAPICICB	Addr of pre-init compat cb
The following field is for FASTLINK capability.
808	(328)	ADDRESS	4	CEECAAOGETSX	User DSA ext from FASTLINK
812	(32C)	SIGNED	4	*	Fields used by GOTO and CEEHTRAV
812	(32C)	SIGNED	2	CEECAAGOSMR	When set will be used to indicate additional frames to skip
814	(32E)	SIGNED	2	*	Indicate additional frames to skip.
816	(330)	ADDRESS	4	CEECAALEOV	Addr of Lang Env/z/OS UNIX LIBVEC
820	(334)	SIGNED	4	CEECAA_SIGSCTR	SIGSAFE counter
824	(338)	BITSTRING	4	CEECAA_SIGSFLG	SIGSAFE flags
		`1... ....`		CEECAA_SIGPUTBACK	Signal putback
		`.1.. ....`		CEECAA_SA_RESTART	SA_RESTART loopback is required this time
		`..1. ....`		*	Reserved
		`...1 ....`		CEECAA_SIGSAFE	It is safe to unconditionally accept delivery of a synchronous signal
		`.... 1...`		CEECAA_CANCELSAFE	It is safe to unconditionally accept delivery of a synchronous cancel
		`.... .1..`		CEECAA_SIGRESYNCH	One or more synchronous signals may have been recently put back the last time a signal was resolicited while returning from library to user code
		`.... ..1.`		CEECAA_FRZ_UNSAFE	It is unsafe to freeze the thread
		`.... ...1`		CEECAA_NOAPPREGS	User application registers may be saved in a nonstandard place
825	(339)	`1... ....`		CEECAA_EINTR_RSOL	Secondary signal resolicit in progress after EINTR from inner function
		`.1.. ....`		CEECAA_EINTR_PUTB	Secondary re-solicited signal has been put back
		`..1. ....`		CEECAA_EINTR_REST	User catcher returned after catching secondary re-solicited signal with SA_RESTART in effect
		`...1 ....`		CEECAA_EINTR_SIGG	"Stray" signal interrupted CEEOSIGG while secondary signal re-solicitation was in progress
		`.... 1111`			Reserved.
826	(33A)	BIT (16)	2	*	Reserved.
828	(33C)	CHARACTER	8	CEECAATHDID	Thread ID
836	(344)	ADDRESS	4	CEECAA_DCRENT	Read/write static external anchor
840	(348)	ADDRESS	4	CEECAA_DANCHOR	Per-thread anchor
844	(34C)	ADDRESS	4	CEECAA_CTOC	TOC anchor for CRENT
848	(350)	ADDRESS	4	CEECAARCB	A(RCB)
852	(354)	SIGNED	4	CEECAACICSRSN	CICS reason code from member language
856	(358)	ADDRESS	4	CEECAAMEMBR	Address of thread-level
860	(35C)	ADDRESS	4	CEECAA_SIGNAL_STATUS	Signal status of the terminating thread member list
864	(360)	ADDRESS	4	CEECAA_HCOM_REG7	HCOM saved R7
864	(360)	ADDRESS	4	CEECAA_HCOM_REG14	HCOM saved R14
868	(364)	ADDRESS	4	CEECAA_STACKFLOOR	Lowest usable addr in XP stack
872	(368)	ADDRESS	4	CEECAAHPGETS	XP stack extension rtn
876	(36C)	ADDRESS	4	CEECAAEDCHPXV	C/C++ XPLINK libvec
880	(370)	ADDRESS	4	CEECAAFOR1	Reserved for FORTRAN
884	(374)	ADDRESS	4	CEECAAFOR2	Reserved for FORTRAN
888	(378)	ADDRESS	4	CEECAATHREADHEAPID	Thread heapid
892	(37C)	CHARACTER	4	CEECAA_SYS_RTNCODE	System (kernel) return code
896	(380)	CHARACTER	4	CEECAA_SYS_RSNCODE	System (kernel) reason code
900	(384)	ADDRESS	4	CEECAAGETFN	Address of the WSA swap routine
904	(388)	CHARACTER	8	CEECAA_LER4	Reserved
912	(390)	ADDRESS	4	CEECAASIGNGPTR	Pointer to 'signam' external variable in a C application
916	(394)	SIGNED	4	CEECAASIGNG	Value of sign of lgamma() -1 - negative sign 0 - zero +1 - positive sign
920	(398)	ADDRESS	4	CEECAA_FORDBG	Ptr to AFHDBHIM - FORTRAN hook interface
924	(39C)	BITSTRING	1	CEECAAAB_STATUS	Validity flags
		`1... ....`		CEECAAAB_GR0_VALID	CEECAAAB_GR0 is valid
		`.1.. ....`		CEECAAAB_ICD1_VALID	CEECAAAB_ICD1 is valid
		`..1. ....`		CEECAAAB_ABCC_VALID	CEECAAAB_ABCC is valid
		`...1 ....`		CEECAAAB_CRC_VALID	CEECAAAB_CRC is valid
		`.... 1...`		CEECAAAB_GR15_VALID	CEECAAAB_GR15 is valid
		`.... .111`		*	Reserved
925	(39D)	UNSIGNED	1	CEECAA_STACKDIRECTION	Stack direction
926	(39E)	BITSTRING	2	*	Reserved
928	(3A0)	SIGNED	4	CEECAAAB_GR0	Reg 0 at the time of abend
932	(3A4)	SIGNED	4	CEECAAAB_ICD1	SDWAICD1
936	(3A8)	SIGNED	4	CEECAAAB_ABCC	SDWAABCC
940	(3AC)	SIGNED	4	CEECAAAB_CRC	SDWACRC
944	(3B0)	ADDRESS	4	CEECAAAGTS	Entry point of CEEVAGTS routine
948	(3B4)	ADDRESS	4	CEECAA_LER5N1	Reserved
952	(3B8)	ADDRESS	4	CEECAAHERP	Address of CEEHERP routine
956	(3BC)	ADDRESS	4	CEECAAUSTKBOS	Start of user stack segment
960	(3C0)	ADDRESS	4	CEECAAUSTKEOS	End of user stack segment
964	(3C4)	ADDRESS	4	CEECAAUSERRTN@	Address of thread start routine. Undefined on IPT or prior to thread init event.
968	(3C8)	CHARACTER	8	CEECAAUDHOOK	Hook swapping XPLINK
976	(3D0)	ADDRESS	4	CEECAACEL_HPXV_B	Address of XPLINK compat vector for Base library
980	(3D4)	ADDRESS	4	CEECAACEL_HPXV_M	Address of XPLINK compat vector for Math library
984	(3D8)	ADDRESS	4	CEECAACEL_HPXV_L	Address of XPLINK compat vector for Locale library
988	(3DC)	ADDRESS	4	CEECAACEL_HPXV_O	Address of XPLINK compat vector for Open library
992	(3E0)	ADDRESS	4	CEECAACEL4VEC3	Address of 3rd C-RTL library vector
996	(3E4)	ADDRESS	4	CEECAA_CEEDLLF	Address of the newest CEEDLLF control block
1000	(3E8)	ADDRESS	4	CEECAA_SAVSTACK	Saved Stack Pointer when OS_NOSTACK linkage routine is called.
1004	(3EC)	CHARACTER	8	*	Reserved
1008	(3F0)	CHARACTER	4	CEECAA_USER_WORD	4-byte user field available for application use
1012	(3F4)	ADDRESS	4	CEECAA_SAVSTACK_ASYNC	When the value is not zero, CEECAA_SAVSTACK_ASYNC contains the address of a 4-byte field provided by the application that holds the Saved Stack Pointer when the register for the stack pointer is being used for other purposes. When the value is zero, CEECAA_SAVSTACK_ASYNC does not contain that address.

Table 2. Common anchor area (CAA) constants
Len	Type	Value	Name	Description
Declare constants for operating system, hardware, and subsystem CEECAASYSTM, CEECAAHRDWR, CEECAASBSYS
1	DECIMAL	0	CEECAASYUND	Undefined
1	DECIMAL	1	CEECAASYUNS	Unsupported
1	DECIMAL	2	CEECAASYVM	VM
1	DECIMAL	3	CEECAASYMVS	z/OS Underlying Hardware
1	DECIMAL	0	CEECAAHWUND	Undefined
1	DECIMAL	1	CEECAAHWUNS	Unsupported
1	DECIMAL	2	CEECAAHW370	System/370 non-XA
1	DECIMAL	3	CEECAAHWXA	System/370 XA
1	DECIMAL	4	CEECAAHWESA	System/370 ESA Underlying Subsystem
1	DECIMAL	0	CEECAASSUND	Undefined
1	DECIMAL	1	CEECAASSUNS	Unsupported
1	DECIMAL	2	CEECAASSNON	No subsystem
1	DECIMAL	3	CEECAASSTSO	TSO
1	DECIMAL	5	CEECAASSCIC	CICS
Declare constants for stack direction CEECAA_STACKDIRECTION
1	DECIMAL	0	CEECAASTACK_UP	UP
1	DECIMAL	1	CEECAASTACK_DOWN	DOWN

Table 3. Common anchor area (CAA) cross reference
Name	Hex Offset	Hex Value	Level
CEECAA	0		1
CEECAA_CANCELSAFE	338	08	4
CEECAA_CTOC	34C		3
CEECAA_DANCHOR	348		3
CEECAA_DCRENT	344		3
CEECAA_ENQ_WAIT_INTERRUPTABLE	2AF	02	4
CEECAA_EXTERNAL	0		2
CEECAA_FORDBG	398		3
CEECAA_FRZ_UNSAFE	338	02	4
CEECAA_HCOM_REG14	360		3
CEECAA_HCOM_REG7	360		4
CEECAA_INVAR	2B2		3
CEECAA_LER4	388		3
CEECAA_LER5	3BC		3
CEECAA_LER5N1	3B4		3
CEECAA_NOAPPREGS	338	01	4
CEECAA_PM	2B1		3
CEECAA_SA_RESTART	338	40	4
CEECAA_SAVSTACK	3E8		4
CEECAA_SAVSTACK_ASYNC	3F4		4
CEECAA_SIGNAL_STATUS	35C		3
CEECAA_SIGPUTBACK	338	80	4
CEECAA_SIGRESYNCH	338	04	4
CEECAA_SIGSAFE	338	10	4
CEECAA_SIGSCTR	334		3
CEECAA_SIGSFLG	338		3
CEECAA_STACKDIRECTION	39D		3
CEECAA_STACKFLOOR	364		3
CEECAA_TCASRV	258		3
CEECAA_TCASRV_ATTENTION	274		4
CEECAA_TCASRV_DELETE	26C		4
CEECAA_TCASRV_EXCEPTION	270		4
CEECAA_TCASRV_FREEMAIN	264		4
CEECAA_TCASRV_GETMAIN	260		4
CEECAA_TCASRV_LOAD	268		4
CEECAA_TCASRV_MESSAGE	278		4
CEECAA_TCASRV_USERWORD	258		4
CEECAA_TCASRV_WORKAREA	25C		4
CEECAA_THREAD_INITIAL	2AF	10	4
CEECAA_TRACE_ACTIVE	2AF	08	4
CEECAA_USE_OLD_STK
CEECAA_USER_WORD	3F0		3
CEECAA_VECTOR	2AF	40	4
CEECAAAB_ABCC	3A8		3
CEECAAAB_ABCC_VALID	39C	20	4
CEECAAAB_CRC	3AC		3
CEECAAAB_CRC_VALID	39C	10	4
CEECAAAB_GR0	3A0		3
CEECAAAB_GR0_VALID	39C	80	4
CEECAAAB_GR15_VALID	39C	08	4
CEECAAAB_ICD1	3A4		3
CEECAAAB_ICD1_VALID	39C	40	4
CEECAAAB_STATUS	39C		3
CEECAAABCODE	2D0		4
CEECAAACALL	1C4		5
CEECAAAGTS	3B0		3
CEECAAALLOC	1A8		4
CEECAAATTN	120		3
CEECAABCALL	1C0		5
CEECAABIMODAL	2AF	80	4
CEECAABOS	8		3
CEECAACD	2D0		3
CEECAACEDB	218		4
CEECAA_CEEDLLF	3E4		3
CEECAACEL4VEC3	3E0		3
CEECAACEL_HPXV_B	3D0		3
CEECAACEL_HPXV_M	3D4		3
CEECAACEL_HPXV_L	3D8		3
CEECAACEL_HPXV_O	3DC		3
CEECAACELV	2B8		3
CEECAACFLTINIT	1F8		4
CEECAACGENE	1F0		4
CEECAACGOTO	1DC		4
CEECAACICSRSN	354		3
CEECAACIO	220		4
CEECAACPCB	214		4
CEECAACPRMS	200		4
CEECAACRENT	1F4		4
CEECAACTHD	208		4
CEECAACURRFECB	20C		4
CEECAADBGINIT	1	20	4
CEECAADDSA	2E0		3
CEECAADIMA	1A4		3
CEECAADMC	2CC		3
CEECAADO	1C8		5
CEECAAEDB	2F0		3
CEECAAEDCHPXV	36C		3
CEECAAEDCOV	234		4
CEECAAEDCV	210		4
CEECAAENTRY	1B0		4
CEECAAEOS	C		3
CEECAAERR	2D8		3
CEECAAESS	314		3
CEECAAEXIT	1B4		4
CEECAAEYEPTR	2F8		3
CEECAAFCBMUTEXOK	228		4
CEECAAFDSETFD	224		4
CEECAAFLAG0	0		3
CEECAAFLAG1	30C		3
CEECAAFLAG2	2AF		3
CEECAAFOR1	370		3
CEECAAFOR2	374		3
CEECAAGETFN	384		3
CEECAAGETLS	2B4		3
CEECAAGETS	2BC		3
CEECAAGETSX	2DC		3
CEECAAGETS1	300		3
CEECAAGOSMR	32C		4
CEECAAHERP	3B8		3
CEECAAHLLEXIT	15C		3
CEECAAHOOK	198		3
CEECAAHOOKS	1A8		3
CEECAAHPGETS	368		3
CEECAAHRDWR	2AD		3
CEECAAIFFALSE	1D0		5
CEECAAIFTRUE	1CC		5
CEECAALABEL	1BC		5
CEECAALANGP	2		3
CEECAALBOS	2C0		3
CEECAALEOS	2C4		3
CEECAALEOV	330		3
CEECAALESS	318		3
CEECAALEVEL	2B0		3
CEECAALNAB	2C8		3
CEECAALWS	280		3
CEECAAMEMBER_AREA	1F0		3
CEECAAMEMBR	358		3
CEECAAMEXIT	1B8		4
CEECAAOGETLS	320		3
CEECAAOGETS	31C		3
CEECAAOGETSX	328		3
CEECAAOTHER	1D8		5
CEECAAPARTSUM	2E8		3
CEECAAPATHS	1BC		4
CEECAAPCB	2F4		3
CEECAAPICICB	324		3
CEECAAPRGCK	308		3
CEECAAPTR	2FC		3
CEECAARCB	350		3
CEECAARS	2D4		3
CEECAARSNCODE	2D4		4
CEECAARSVDH1	1E0		4
CEECAARSVDH2	1E4		4
CEECAARSVDH3	1E8		4
CEECAARSVDH4	1EC		4
CEECAASAVR	284		3
CEECAASBSYS	2AE		3
CEECAASECTSIZ	2E4		3
CEECAASHAB	304		3
CEECAASHAB_KEY	3D0		2
CEECAASIGNG	394		3
CEECAASIGNGPTR	390		3
CEECAASORT	30C	80	4
CEECAASPCFLAG3	21F		4
CEECAASSEXPNT	2EC		3
CEECAASTATE	1AC		4
CEECAASYSTM	2AC		3
CEECAATC16	22C		4
CEECAATC17	230		4
CEECAATHDID	33C		3
CEECAATHFN	2	08	4
CEECAATHREADHEAPID	378		3
CEECAATIP	2AF	20	4
CEECAATORC	44		3
CEECAATOVF	74		3
CEECAATURC	46		4
CEECAAUDHOOK	3C8		3
CEECAATRTSPACE	23C		4
CEECAAURC	310		3
CEECAAUSTKBOS	3BC		3
CEECAAUSTKEOS	3C0		3
CEECAAWHEN	1D4		5
CEECAAXHDL	0	02	4

CAA fields

The fields are defined as follows:

CEECAAFLAG0

CAA flag bits; the bits are defined as follows:

0-5: Reserved
6: CEECAAXHDL: a flag that is used by the exception handler. If the flag is set to 1, the application requires immediate return/percolation to the system on any interrupt or exception handler event.
7: Reserved

CEECAALANGP

PL/I language compatibility flags external to Language Environment; the bits are defined as follows:

0-3: Reserved
4: CEECAATHFN : A flag set by PL/I to indicate a PL/I FINISH ON UNIT is active. If flag is set to 1, then NO PL/I FINISH ON UNIT is active.
5-7: Reserved

CEECAABOS

Start of the current storage segment. This field is initially set during thread initialization. It indicates the start of the current stack storage segment. It is altered when the current stack storage segment is changed.

CEECAAEOS

This field is used to determine if a stack overflow routine must be called when allocating storage from the user stack. Normally, the value of this field will represent the end of the current user stack segment. However, its value can also be zero to force the call of a stack overflow routine for every allocation of storage from the user stack. This field is used by function prologs that do not use FASTLINK linkage conventions.

CEECAATORC

Thread level return code. The thread level return code set by CEESRC callable service.

CEECAATOVF

Address of stack overflow routine. This routine is called when there is no space available in the current stack extension to allocate a new stack frame. The routine allocates a new stack extension, updates the CEECAABOS and CEECAAEOS fields in the CAA, and returns the DSA address in the stack extension.

CEECAAATTN

Address of the Language Environment attention handling routine, which supports the polling code convention of Language Environment for attention processing.

CEECAAHLLEXIT

Exit list control block address. Exit list control block address as passed back from the HLL user exit in the A_exit parameter. For more information, see z/OS Language Environment Programming Guide.

CEECAAHOOK

Hook code sequence. CEECAAHOOK contains the following code sequence:

ST   12,CEEDSARENT    Put return addr into DSA
BALR 12,0             Get addressability
L    12,CEECAADIMA-*(,12)  Get A(CEECAADIMADDR)
BALR 12,12            Go with 12 the base reg.

CEECAADIMA

DIM address. Address of the Debugger Interface Module (DIM)

CEECAAHOOKS

Hook area. This is the start of 18 fullword execute hooks. Language Environment initializes each fullword to X'0700',S(CEECAAUDHOOK). The hooks can be altered to support various debugger hook mechanisms such as the EXecute hooks that Debug Tool provides.

CEECAAALLOC

ALLOCATE description built hook.

CEECAASTATE

New statement begins hook.

CEECAAENTRY

Block entry hook.

CEECAAEXIT

Block exit hook.

CEECAAMEXIT

Multiple block exit hook.

CEECAAPATHS

PATH hook.

CEECAALABEL

At a label constant hook.

CEECAABCALL

Before CALL hook.

CEECAACALL

After CALL hook.

CEECAADO

DO block starting hook.

CEECAAIFTRUE

True part of IF hook.

CEECAAIFFALSE

False part of IF hook.

CEECAAWHEN

WHEN group starting hook.

CEECAAOTHER

OTHERWISE group hook.

CEECAAGOTO

GOTO hook for C hook.

CEECAARSVDH1

Reserved hook.

CEECAARSVDH2

Reserved hook.

CEECAAMULTEVT

Multiple event hook

CEECAAMEVMASK

Multiple event hook mask

CEECAACGENE

C/370 CGENE

CEECAACRENT

C or C++ writable static.

CEECAACFLTINIT

Convert fixed to float cfltinit is used by compiled code

CEECAACPRMS

Parameters passed to IBMBLIIA cprms is reference by user's code offset: 4*128

CEECAAC_RTL

Combination of 24 unique C/370 trc types & 8 common trc types

CEECAACTHD

C/370 CTHD

CEECAACURRFECB

CEECAAEDCV

Pointer to the C/370 vector table.

CEECAACPCB

Reserved

CEECAACEDB

C/370 CEDB

CEECAASPCFLAG3

Used for SPC

CEECAACIO

Address of cio

CEECAAFDSETFD

Used by FD_* macros

CEECAAFCBMUTEXOK

CEECAATC16

CEECAATC17

CEECAAEDCOV

C/370 Open Libvec

CEECAACTOFSV

CEECAATRTSPACE

C/370 Open Libvec

CEECAA_TCASRV

TCA service routine vector, which contains the following fullword address pointers:

CEECAA_TCASRV_USERWORD
CEECAA_TCASRV_WORKAREA
CEECAA_TCASRV_GETMAIN
CEECAA_TCASRV_FREEMAIN
CEECAA_TCASRV_LOAD
CEECAA_TCASRV_DELETE
CEECAA_TCASRV_EXCEPTION
CEECAA_TCASRV_ATTENTION
CEECAA_TCASRV_MESSAGE

CEECAALWS

Address of PL/I Language Working Space.

CEECAASAVR

CEECAASYSTM

Underlying operating system. The value indicates the operating system supporting the active program. The values are defined as follows:

0: Undefined. This value should never occur after initializing Language Environment
1: Unsupported
2: VM/ESA
3: z/OS®

CEECAAHRDWR

Underlying hardware. The value indicates the type of hardware on which the program is executing; the values are defined as follows:

0: Undefined. This value should never occur after initializing Language Environment
1: Unsupported
2: System/370, non-XA
3: System/370, XA
4: System/370, ESA

CEECAASBSYS

Underlying subsystem. The value indicates the subsystem, if any, on which the program is executing; the values are defined as follows:

0: Undefined. This value should never occur after initializing Language Environment
1: Unsupported
2: None. The program is not executing under a subsystem according to Language Environment
3: TSO
4: IMS™
5: CICS

CEECAAFLAG2

CAA Flag 2. The bits are defined as follows:

0: Set if bimodal addressing
1: Set if vector hardware
2: Thread terminating
3: Initial thread
4: Library trace is active; the TRACE runtime option was set
5: Reserved
6: Thread is in an enqueue wait
7: Reserved

CEECAALEVEL

Language Environment level identifier. This contains a unique value that identifies each release of Language Environment. This number is incremented for each new release of Language Environment. Beginning with 10, the version and release numbers are the same as OS/390® version and release numbers. The values are defined as follows:

1: IBM® SAA AD/Cycle LE/370 V1 R1
2: IBM SAA AD/Cycle LE/370 V1 R2
3: IBM SAA AD/Cycle LE/370 V1 R3
4: IBM Language Environment for MVS™ & VM V1 R4
5: OS/390 Language Environment V1 R5
6: OS/390 Language Environment V1 R6
7: OS/390 Language Environment V1 R7
8: OS/390 Language Environment V1 R8
9: OS/390 Language Environment V1 R9
10: OS/390 Language Environment V2 R7
11: OS/390 Language Environment V2 R8
12: OS/390 Language Environment V2 R9
13: OS/390 Language Environment V2 R10
14: z/OS Language Environment V1 R2
15: z/OS Language Environment V1 R3
16: z/OS Language Environment V1 R4
17: z/OS Language Environment V1 R5
18: z/OS Language Environment V1 R6
19: z/OS Language Environment V1 R7
20: z/OS Language Environment V1 R8
21: z/OS Language Environment V1 R9
22: z/OS Language Environment V1 R10
23: z/OS Language Environment V1 R11
24: z/OS Language Environment V1 R12
25: z/OS Language Environment V1 R13
26: z/OS Language Environment V2 R1
27: z/OS Language Environment V2 R2

CEECAA_PM

Program mask.

CEECAA_INVAR

Field that is at the same fixed offset in 31-bit and 64-bit CAAs

CEECAAGETLS

Address of stack overflow for library routines.

CEECAACELV

Address of the Language Environment library vector. This field is used to locate dynamically loaded Language Environment routines.

CEECAAGETS

Address of the Language Environment prolog stack overflow routine. The address of the Language Environment get stack storage routine is included for fast reference in prolog code.

CEECAALBOS

Start of the library stack storage segment. This field is initially set during thread initialization. It indicates the start of the library stack storage segment. It is altered when the library stack storage segment is changed.

CEECAALEOS

This field is used to determine if a stack overflow routine must be called when allocating storage from the library stack. Normally, the value of this field will represent the end of the current library stack segment. However, its value can also be zero to force the call of a stack overflow routine for every allocation of storage from the library stack. This field is used by function prologs that do not use FASTLINK linkage conventions.

CEECAALNAB

Next available library stack storage byte. This contains the address of the next available byte of storage on the library stack. It is modified when library stack storage is obtained or released.

CEECAADMC

Language Environment shunt routine address. Its value is initially set to zero during thread initialization. If it is nonzero, this is the address of a routine used in specialized exception processing. For more information, see z/OS Language Environment Programming Guide.

CEECAAACD

Most recent CAASHAB abend code.

CEECAAABCODE

Most recent abend completion CDE.

CEECAAARS

Most recent CAASHAB reason code.

CEECAAARSNCODE

Most recent abend reason code.

CEECAAERR

Address of the current CEECIB. After completion of initialization, this always points to a CEECIB. During exception processing, the current CEECIB contains information about the current exception that is being processed. Otherwise, it indicates that no exception is being processed.

CEECAAGETSX

Address of the user stack extender routine. This routine is called to extend the current DSA in the user stack. Its address is in the CEECAA for performance reasons.

CEECAADDSA

Address of the Language Environment dummy DSA. This address determines if a DSA is the dummy DSA, also known as the zeroth DSA.

CEECAASECTSIZ

Vector section size.

CEECAAPARTSUM

Vector partial sum number.

CEECAASSEXPNT

Log of the vector section size.

CEECAAEDB

Address of the Language Environment enclave data block. This field points to the encompassing EDB.

CEECAAPCB

Address of the Language Environment Process Control Block. This field points to the encompassing PCB.

CEECAAEYEPTR

Address of the CAA eye catcher. This field can be used for validation of the CAA.

CEECAAPTR

Address of the CAA. This field points to the CAA itself and can be used in validation of the CAA.

CEECAAGETS1

Non-DSA Stack overflow. This field is the address of a stack overflow routine which cannot guarantee that the current R13 is pointing at a DSA. R13 must point, at a minimum, point to a save area. For additional details, see Obtain a DSA in user stack with R13 pointing to save area.

CEECAASHAB

ABEND shunt routine. Its value is initially set to zero during thread initialization. If it is nonzero, this is the address of a routine used in specialized exception processing for ABENDs that are intercepted in the ESTAE exit. For more information, see z/OS Language Environment Programming Guide.

CEECAAPRGCK

Program interrupt code for CEECAADMC. If CEECAADMC is nonzero, and a program interrupt occurs, this field is set to the program interrupt code and control is passed to the address in CEECAAMDC. For more information, see z/OS Language Environment Programming Guide.

CEECAAFLAG1

CAA flag bits; the bits are defined as follows:

0: CEECAASORT: a call to DFSORT is active.
1: CEECAA_USE_OLD_STK: Use old stack
2: CEECAACICS_EXT_REG: ERTLI CICS extended register interface is in effect.
3: CEECAASHAB_RECOVER_IN_ESTAE_MODE: instructs Language Environment to set up for retry to the abend shunt routine, only if the PSW key that was in effect at the time the Language Environment ESTAE or user-provided error recovery routine was established matches the IPK result that is stored in CEECAASHAB_KEY.
4: Reserved.
5: CEECAA_FETCH_RELES_IN_PROGRESS: CEEFETCH or CEERELES is in progress on this thread.
6-7: Reserved.

CEECAASHAB_KEY

IPK result when CEECAASHAB is set.

CEECAAURC

Thread level return code. This is the common place for members to set the return codes for sub-to-sub return code processing.

CEECAAESS

CEECAALESS

CEECAAOGETS

Pointer to overflow user segment from FASTLINK.

CEECAAOGETLS

Pointer to overflow library segment from FASTLINK.

CEECAAPICICB

Address of preinit compatibility control block. This is provided in support of the PL/I preinitialization compatibility support.

CEECAAOGETSX

Pointer to user DSA exit from FASTLINK.

CEECAAGOSMR

Go Some More—Used CEEHTRAV multiple.

CEECAALEOV

Address of the Language Environment—z/OS UNIX System Services (z/OS UNIX) LIBVEC.

CEECAA_SIGSCTR

Signal Safe counter. When 0, an interrupt is allowed; when greater than 0, interrupts are temporarily inactive. Four types of interrupts can be blocked or allowed: signal interrupts, cancel interrupts, quiesce-terminate interrupts, and quiesce-freeze interrupts.

CEECAA_SIGSFLG

Signal Safe flags.

0: CEECAA_SIGPUTBACK — A signal was put back.
1: CEECAA_SA_RESTART — indicates that a signal registered with the SA_RESTART flag interrupted the last kernel call and the signal catcher returned (that is, loopback is required to re-issue the kernel call).
2: Reserved.
3: CEECAA_SIGSAFE: Indicates that synchronous signals are safe to be delivered, regardless of where the interrupt occurred.
4: CEECAA_CANCELSAFE: Indicates that it is safe to unconditionally accept delivery of a synchronous cancel.
5: CEECAA_SIGRESYNC: Indicates that one or more synchronous signals may have been recently put back the last time a signal was resolicited while returning from library to user code.
6: CEECAA_FRZ_UNSAFE: Indicates that the thread is unsafe to be frozen.
7: CEECAA_NOAPPREGS: Indicates that user application registers may be saved in a nonstandard place.
8: CEECAA_EINTR_RSOL: Secondary Signal re-solicitation is in progress, after EINTR errno from inner function.
9: CEECAA_EINTR_PUTB: Secondary re-solicited signal has been put back.
10: CEECAA_EINTR_REST: User signal catcher returned after catching secondary re-solicited signal with SA_RESTART in effect.
11: CEECAA_EINTR_SIGG: Stray signal interrupted CEEOSIGG while secondary signal resolicitation was in progress.

CEECAATHDID

This CAA's POSIX thread identifier (8 bytes).

CEECAA_DCRENT

Read/write static external anchor.

CEECAA_DANCHOR

Per-thread anchor.

CEECAA_CTOC

TOC anchor for CRENT.

CEECAARCB

Address of RCB.

CEECAACICSRSN

CICS reason code for member language.

CEECAAMEMBR

Address of thread-level member list. An entry is reserved for each member known to Language Environment. There is one member list per thread. For details, see Language Environment member list and event handler.

CEECAA_SIGNAL_STATUS

Signal status for terminating thread.

CEECAA_HCOM_REG7

The original register 7 value overlaid by a pointer to CEEOSIGX when the latest signal was put back.

CEECAA_HCOM_REG14

The original register 14 value overlaid by a pointer to CEEOSIGR when the latest signal was put back.

CEECAA_STACKFLOOR

Lowest usable address in the XPLINK stack.

CEECAAHPGETS

XPLINK stack extension routine.

CEECAAEDCHPXV

C++ XPLINK libvec.

CEECAAFOR1

Reserved for Fortran.

CEECAAFOR2

Reserved for Fortran.

CEECAATHREADHEAPID

Pointer to thread heap ID.

CEECAA_SYS_RTNCODE

System (kernel) return code.

CEECAA_SYS_RSNCODE

System (kernel) reason code.

CEECAAGETFN

Address of the WSA swap routine.

CEECAASIGNGPTR

Pointer to the "signam" external variable.

CEECAASIGNG

Value of the sign of lgamma() function.

-1: Negative sign
0: Zero
+1: Positive sign

CEECAA_FORDBG

Pointer to AFHDBHIM — FORTRAN hook interface.

CEECAAAB_STATUS

Contains the following validity flags:

CEECAAAB_GR0_VALID: Indicates if the CEECAAAB_GR0 field contains valid data about the last abend.
CEECAAAB_ICD1_VALID: Indicates if the CEECAAAB_ICD1 field contains valid data about the last abend.
CEECAAAB_ABCC_VALID: Indicates if the CEECAAAB_ABCC field contains valid data about the last abend.
CEECAAAB_CRC_VALID: Indicates if the CEECAAAB_CRC field contains valid data about the last abend.
CEECAAAB_GR15_VALID: Indicates if the CEECAAAB_GR15 field contains valid data about the last abend.

CEECAA_STACKDIRECTION

Stack direction.

CEECAAAB_GR0

CEECAAAB_ICD1

The eight bit interrupt code from SDWAICD1 field of the SDWA for the abend. This is only valid if the CEECAAAB_ICD1_VALID bit is on.

CEECAAB_ABCC

The abend completion code, taken from SDWAABCC field of the SDWA for the shunted abend. This is only valid if the CEECAAAB_ABCC_VALID bit is on.

CEECAAAB_CRC

Component reason code, or return code associated with the abend, taken from the SDWACRC field of the SDWA for the shunted abend. This is only valid if the CEECAAAB_CRC_VALID bit is on.

CEECAAAGTS

A 4-byte pointer that contains the address of the entry point of the CEEVAGTS routine. CEEVAGTS supports the code that the C compiler generates in module prologs for DSA allocation.

CEECAA_LER5N1

Reserved.

CEECAAAHERP

Address of the CEEHERP routine.

CEECAAAUSTKBOS

Start of user stack segment.

CEECAAAUSTKEOS

End of user stack segment.

CEECAAUSERRTN@

Address of thread start routine.

CEECAAUDHOOK

Hook swapping XPLINK.

CEECAACEL_HPXV_B

Address of XPLINK vector for Base library.

CEECAACEL_HPXV_M

Address of XPLINK vector for Math library.

CEECAACEL_HPXV_L

Address of XPLINK vector for Locale library.

CEECAACEL_HPXV_O

Address of XPLINK vector for Open library.

CEECAACEL4VEC3

Address of 3rd C-RTL library vector.

CEECAA_CEEDLLF

Address of the newest CEEDLLF control block.

CEECAA_SAVSTACK

Saved Stack Pointer when the OS_NOSTACK linkage routine is called. After the call returns, the CEECAA_SAVSTACK field must be set back to zero. When the value in CEECAA_SAVSTACK is not zero, condition management and signal processing use this value as the current stack pointer. The format of the stack is determined by the value in the CEECAA_STACKDIRECTION field. Asynchronous signals are put back if the interrupt occurs outside the bounds of the routine that owns the stack frame.

CEECAA_SAVSTACK_ASYNC

When the value is not zero, CEECAA_SAVSTACK_ASYNC contains the address of a 4-byte field provided by the application that holds the Saved Stack Pointer when the register for the stack pointer is being used for other purposes. When the value is zero, CEECAA_SAVSTACK_ASYNC does not contain that address. When the field exists and is not zero, condition management and signal processing use this value as the current stack pointer. The format of the stack is determined by the value in the CEECAA_STACKDIRECTION field. Asynchronous signals are processed even if the interrupt occurs outside the bounds of the routine that owns the stack frame.