Page of SY20-0884-3 As Updated Aug. 1, 1979 by TNL SN25-0497 ABW SECT ABWSECT describes the fields used for saving registers and other data during abend
recovery. V-constants in DMSABN, DMSDBG, DMSFRE, DMSITI, DKSITP, and DMSITS point to the ABWSECT block. ABWSECT is defined in module DMSABW. o 40 48 ABNRR
4C • 90 Hexadecimal Field
Displacement Name
------------ 0 ABNREGS DS 16F 40 ABNPSW DS D
48 ABNRR DS F
4C ABNPAS13 DS 18F
94 ABNCMSG DS CL96 :t:2!: DMSERR PtIST 94 ORG ABNPAS13 4C ABNERLST DS 47X ABNREGS ABNPSW ABNPAS13 r -J , ABNCMSG _____ -J Field Description, Contents, Meaning
Registers at time of abend PSi at time of abend
Temporary save area
Area passed to nucleus routines
Console message save area for IPCS extension program product Section 2. CMS Data Areas and Control Blocks 139

Aug. 1, 1979 ADTSECT ADTSECT describes the attributes of virtual disks (A-G, S, I, Z) accessed by a virtual
machine via the ACCESS command. Space is allocated for the ADT when DMSNUC is assembled.
In the ADT, certain fields are defined for use by both CMS and OS. For example, ADTHBcr
field at displacement 1C (hexadecimal) into ADTSECT is also defined as OSADTVTA for use
by OS simulation routines. ADTSECT is invoked by the ADT macro. 0 8 10 18 20 28 30 38 40 48 50 58 60 68
Hexadecimal Field
Displacement Name
ADTPTR
ADTFDA
ADTMFDA ADTFSTC ADTCFST ADTNUM ADTLEFT
ADTCIL ADTMSK ADTPQM1
ADTPQM3 ADTLFST ADTXNREC
ADTID A*1 A*2
ADTDTA
ADTMFDN
ADTHBCT
ADTCHBA ADT1ST ADTUSED ADTLAST A*3 A*4 A*5 I A*6 ADTQQM ADTPQM2 ADTLHBA
ADTNACW ADTRES ADTXAREC
Field Description, Contents, Meaning !2£ ]eag-gnl'y Disk§. Di§.t§. o ADTID DS CL6 Disk identifier (label)
6 ADTFLG3 DS 1X A*1 Third flag byte Bit§. de!ined i!! !J21FLG,J ADTFUPD1 EQU X'80' First half of DMSAUD has been called
ADTFXCHN EQU X'40' Extra chain link(s) to be returned ADTFRWOS EQU X'20' Read/write OS or DOS disk ADTFSORT EQU X' 10' All FST hyperblocks and FST entries sorted ADTFORCE EQU X'08' CMS/DOS/OS disk forced to a read-only ADTFNOAB EQU X'04' For DMSAUD routine: Do not abend
if it is a disk error
7 ADTFTIP DS 1X A*2 Filetype flag byte
8 ADTPTR DS 1A Pointer to next ADT block in chain C ADTDTA DS 1A Device table address in NUCON 10 ADTFDA DS 1A File directory (PST AT) address
14 ADTN DS 1F Number of doublewords in master
file directory
18 ADTMFDA DS 1A Master file directory address
1C OSADTVTA DS OF VTOC address of OS pack
1C ADTHBCT DS 1F FST hyperblock count 140 IBM VM/370 Data Areas and Control Block Logic