Figure 1 demonstrates a divide-by-zero error. In this example, the main Enterprise PL/I routine passed bad data to an Enterprise PL/I subroutine. The bad data in this example is 0, and the error occurred when the subroutine SUB1 attempted to use this data as a divisor.
Figure 1. Enterprise
PL/I routine with a divide-by-zero error
5655-H31 IBM(R) Enterprise PL/I for z/OS V3.R6.M0 (Built:20070119) 2007.01.31 16:02:31 Page 1
Options Specified
Install:
Command:
Line.File Process Statements
1.0 *PROCESS GONUMBER LIST S STG TEST MAP;
Install:
5655-H31 IBM(R) Enterprise PL/I for z/OS SAMPLE: PROC OPTIONS(MAI 2007.01.31 16:02:31 Page 2
Compiler Source
Line.File
2.0 SAMPLE: PROC OPTIONS(MAIN) ;
3.0 On error
4.0 begin;
5.0 On error system; /* prevent nested error conditions */
6.0 Call PLIDUMP('TBC','PLIDUMP called from error ON-unit');
7.0 Put Data; /* Display variables */
8.0 End;
9.0
10.0 DECLARE
11.0 A_number Fixed Bin(31),
12.0 My_Name Char(13),
13.0 An_Array(3) Fixed Bin(31) init(1,3,5);
14.0
15.0 Put skip list('Sample Starting');
16.0 A_number = 0;
17.0 My_Name = 'Tery Gillaspy';
18.0
19.0 Call Sub1(a_number, my_name, an_array);
20.0
21.0 SUB1: PROC(divisor, name1, Array1);
22.0 Declare
23.0 Divisor Fixed Bin(31),
24.0 Name1 Char(13),
25.0 Array1(3) Fixed Bin(31);
26.0 Put skip list('Sub1 Starting');
27.0 Array1(1) = Array1(2) / Divisor;
28.0 Put skip list('Sub1 Ending');
29.0 End SUB1;
30.0
31.0 Put skip list('Sample Ending');
32.0
33.0 End;
⋮ Because variables are not usually displayed in a PLIDUMP dump, this routine included a PUT DATA statement, which generated a listing of arguments and variables used in the routine. Figure 2 shows this output.
Figure 2. Variables
from routine SAMPLE (Enterprise PL/I)
1Sample Starting
Sub1 Starting A_NUMBER= 0 MY_NAME='Tery Gillaspy' AN_ARRAY(1)= 1
AN_ARRAY(2)= 3 AN_ARRAY(3)= 5;The routine in Figure 1 was compiled with the LIST compiler option, which generated the object code listing shown in Figure 3.
Figure 3. Object
code listing from example Enterprise PL/I routine
⋮
5655-H31 IBM(R) Enterprise PL/I for z/OS SAMPLE: PROC OPTIONS(MAI : SUB1 2007.01.31 16:02:31 Page 5
OFFSET OBJECT CODE LINE# FILE# P S E U D O A S S E M B L Y L I S T I N G
000000 000021 | SUB1 DS 0D
000000 47F0 F022 000021 | B 34(,r15)
000004 01C3C5C5 CEE eyecatcher
000008 00000160 DSA size
00000C 00000848 =A(PPA1-SUB1)
⋮
000136 5820 D14C 000027 | L r2,#SR_PARM_3(,r13,332)
00013A 5820 2008 000027 | L r2,_addrARRAY1(,r2,8)
00013E 5840 2000 000027 | L r4,_shadow1(,r2,0)
000142 5820 D14C 000027 | L r2,#SR_PARM_3(,r13,332)
000146 5820 2008 000027 | L r2,_addrARRAY1(,r2,8)
00014A 5820 2004 000027 | L r2,_shadow1(,r2,4)
00014E 5040 D150 000027 | ST r4,#wtemp_1(,r13,336)
000152 5020 D144 000027 | ST r2,_temp15(,r13,324)
000156 5820 D144 000027 | L r2,_temp15(,r13,324)
00015A 5850 2004 000027 | L r5,_shadow2(,r2,4)
00015E 5840 D150 000027 | L r4,#wtemp_1(,r13,336)
000162 5820 D144 000027 | L r2,_temp15(,r13,324)
000166 5820 2000 000027 | L r2,_shadow2(,r2,0)
00016A 1382 000027 | LCR r8,r2
00016C 5820 D14C 000027 | L r2,#SR_PARM_3(,r13,332)
000170 5820 2008 000027 | L r2,_addrARRAY1(,r2,8)
000174 5890 2000 000027 | L r9,_shadow1(,r2,0)
000178 5820 D14C 000027 | L r2,#SR_PARM_3(,r13,332)
00017C 5820 2008 000027 | L r2,_addrARRAY1(,r2,8)
000180 5820 2004 000027 | L r2,_shadow1(,r2,4)
000184 5090 D154 000027 | ST r9,#wtemp_2(,r13,340)
000188 1E58 000027 | ALR r5,r8
00018A 4145 4000 000027 | LA r4,#AddressShadow(r5,r4,0)
00018E 5040 D158 000027 | ST r4,#wtemp_3(,r13,344)
000192 5020 D140 000027 | ST r2,_temp14(,r13,320)
000196 5820 D140 000027 | L r2,_temp14(,r13,320)
00019A 5840 2004 000027 | L r4,_shadow2(,r2,4)
00019E 8940 0001 000027 | SLL r4,1
0001A2 5820 D154 000027 | L r2,#wtemp_2(,r13,340)
0001A6 5850 D140 000027 | L r5,_temp14(,r13,320)
0001AA 5850 5000 000027 | L r5,_shadow2(,r5,0)
0001AE 1355 000027 | LCR r5,r5
0001B0 1E45 000027 | ALR r4,r5
0001B2 5884 2000 000027 | L r8,_shadow2(r4,r2,0)
0001B6 5820 D14C 000027 | L r2,#SR_PARM_3(,r13,332)
0001BA 5820 2000 000027 | L r2,_addrDIVISOR(,r2,0)
0001BE 5820 2000 000027 | L r2,_shadow2(,r2,0)
0001C2 8E80 0020 000027 | SRDA r8,32
0001C6 1D82 000027 | DR r8,r2
0001C8 1849 000027 | LR r4,r9
0001CA 5820 D158 000027 | L r2,#wtemp_3(,r13,344)
0001CE 5040 2000 000027 | ST r4,_shadow2(,r2,0)
⋮ Figure 4 shows the Language Environment dump for routine SAMPLE.
Figure 4. Language Environment dump
from example Enterprise PL/I routine (Part 1 of 2)
CEE3DMP V1 R12.0: PLIDUMP called from error ON-unit 03/13/10 4:02:34 PM Page: 1
ASID: 0142 Job ID: J0009418 Job name: LEDGSMP3 Step name: GO UserID: BARBARA
CEE3845I CEEDUMP Processing started.
PLIDUMP was called from statement number 6 at offset +000000D4 from _ON_Begin_4_Blk_2 with entry address 11200340
Information for enclave SAMPLE
Information for thread 8000000000000000
Traceback:
DSA Entry E Offset Statement Load Mod Program Unit Service Status
1 IBMPDUMP +000002AE IBMPEV11 PQ78306 Call
2 _ON_Begin_4_Blk_2
+000000D4 6 SAMPLE SUB1 Call
3 IBMPEONR +000002A2 IBMPEV11 PQ76426 Call
4 IBMPEBOP +000004DC IBMPEV11 LE19BAS Call
5 CEEEV011 +00000132 IBMPEV11 CEEEV011 Call
6 CEEHDSP +000017D0 CEEPLPKA CEEHDSP D1908 Call
7 SUB1 +000001C6 27 SAMPLE SUB1 Exception
8 SAMPLE +000001CA 19 SAMPLE SUB1 Call
9 IBMPMINV +000004DE IBMPEV11 IBMPMINV Call
10 CEEEV011 +00000202 IBMPEV11 CEEEV011 Call
11 CEEBBEXT +000001B6 CEEPLPKA CEEBBEXT D1908 Call
DSA DSA Addr E Addr PU Addr PU Offset Comp Date Compile Attributes
1 11A3ED08 114A5E38 114A5E38 +000002AE 20061214 LIBRARY EBCDIC HFP
2 11A3EBB0 11200340 112000D0 +00000344 20070131 ENT PL/I EBCDIC HFP
3 11A3EA18 114A8B98 114A8B98 +000002A2 20061214 LIBRARY EBCDIC HFP
4 11A3E848 114B0390 114B0390 +000004DC 20061214 LIBRARY EBCDIC HFP
5 11A3E7B8 114072E8 114072E8 +00000132 20061214 LIBRARY
6 11A3B698 112C4238 112C4238 +000017D0 20061215 CEL
7 11A3B538 112000D0 112000D0 +000001C6 20070131 ENT PL/I EBCDIC HFP
8 11A3B3B8 112004B8 112000D0 +000005B2 20070131 ENT PL/I EBCDIC HFP
9 11A3B180 114DE990 114DE990 +000004DE 20061214 LIBRARY
10 11A3B0F0 114072E8 114072E8 +00000202 20061214 LIBRARY
11 11A3B030 11292208 11292208 +000001B6 20061215 CEL
Condition Information for Active Routines
Condition Information for SUB1 (DSA address 11A3B538)
CIB Address: 11A3BFB8
Current Condition:
IBM0281S A prior condition was promoted to the ERROR condition.
Original Condition:
CEE3209S The system detected a fixed-point divide exception (System Completion Code=0C9).
Location:
Program Unit: SUB1 Entry: SUB1 Statement: 27 Offset: +000001C6
Machine State:
ILC..... 0002 Interruption Code..... 0009
PSW..... 078D2600 91200298
GPR0..... 0000000_00000001 GPR1..... 0000000_00004A48 GPR2..... 0000000_00000000 GPR3..... 0000000_1120010A
GPR4..... 0000000_00000004 GPR5..... 0000000_FFFFFFFC GPR6..... 0000000_11200BA8 GPR7..... 0000000_11200748
GPR8..... 0000000_00000000 GPR9..... 0000000_00000003 GPR10.... 0000000_11A3B0B0 GPR11.... 0000000_11200FE4
GPR12.... 0000000_112139B0 GPR13.... 0000000_11A3B538 GPR14.... 0000000_912001FE GPR15.... 0000000_1153CF40
FPC...... F0000000
FPR0..... 26100000 00000000 FPR1..... 00000000 00000000
FPR2..... 18000000 00000000 FPR3..... 00000000 00000000
FPR4..... 00000000 00000000 FPR5..... 00000000 00000000
FPR6..... 00000000 00000000 FPR7..... 00000000 00000000
FPR8..... 00000000 00000000 FPR9..... 00000000 00000000
FPR10.... 00000000 00000000 FPR11.... 00000000 00000000
FPR12.... 00000000 00000000 FPR13.... 00000000 00000000
FPR14.... 00000000 00000000 FPR15.... 00000000 00000000
VR0...... 26100000 00000000 00000000 00000000 VR1...... 00000000 00000000 00000000 00000000
VR2...... 18000000 00000000 00000000 00000000 VR3...... 00000000 00000000 00000000 00000000
VR4...... 00000000 00000000 00000000 00000000 VR5...... 00000000 00000000 00000000 00000000
VR6...... 00000000 00000000 00000000 00000000 VR7...... 00000000 00000000 00000000 00000000
VR8...... 00000000 00000000 00000000 00000000 VR9...... 00000000 00000000 00000000 00000000
VR10..... 00000000 00000000 00000000 00000000 VR11..... 00000000 00000000 00000000 00000000
VR12..... 00000000 00000000 00000000 00000000 VR13..... 00000000 00000000 00000000 00000000
VR14..... 00000000 00000000 00000000 00000000 VR15..... 00000000 00000000 00000000 00000000
VR16..... 00000000 00000000 00000000 00000000 VR17..... 00000000 00000000 00000000 00000000
VR18..... 00000000 00000000 00000000 00000000 VR19..... 00000000 00000000 00000000 00000000
VR20..... 00000000 00000000 00000000 00000000 VR21..... 00000000 00000000 00000000 00000000
VR22..... 00000000 00000000 00000000 00000000 VR23..... 00000000 00000000 00000000 00000000
VR24..... 00000000 00000000 00000000 00000000 VR25..... 00000000 00000000 00000000 00000000
VR26..... 00000000 00000000 00000000 00000000 VR27..... 00000000 00000000 00000000 00000000
VR28..... 00000000 00000000 00000000 00000000 VR29..... 00000000 00000000 00000000 00000000
VR30..... 00000000 00000000 00000000 00000000 VR31..... 00000000 00000000 00000000 00000000 
Storage dump near condition, beginning at location: 11200286
+000000 11200286 5820D14C 58202000 58202000 8E800020 1D821849 5820D158 50402000 4400C1AC |..J<.............b....J.& ....A.|
⋮ Figure 5. Language Environment dump
from example Enterprise PL/I routine (Part 2 of 2)
Control Blocks for Active Routines:
⋮
DSA for CEEHDSP: 11A3B698
+000000 FLAGS.... 0808 member... CEE1 BKC...... 11A3B538 FWC...... 11A3E7B8 R14...... 912C5A0A
+000010 R15...... 914072E8 R0....... 00000010 R1....... 1120C2E8 R2....... 11A3BFB8 R3....... 11A3B3B8
+000024 R4....... 112C8E64 R5....... FFFFFF30 R6....... 00000001 R7....... 00000007 R8....... 912C5712
+000038 R9....... 11A3D696 R10...... 11A3C697 R11...... 112C4238 R12...... 112139B0 reserved. 00000000
+00004C NAB...... 11A3E7B8 PNAB..... 11A3B874 reserved. 11A3B9D8 00000000
+000064 reserved. 11A3BE58 reserved. 00000000 MODE..... 00000000 reserved. 00000000
+000078 reserved. 00000000 reserved. 00000000
DSA for SUB1: 11A3B538
+000000 FLAGS.... 10A3 member... B0F0 BKC...... 11A3B3B8 FWC...... 11A3B5F8 R14...... 912001FE
+000010 R15...... 11537648 R0....... 11A3B668 R1....... 11A3B5D0 R2....... 00000001 R3....... 1120010A
+000024 R4....... 00004A48 R5....... 11A3B3B8 R6....... 11200BA8 R7....... 11200748 R8....... 11A3B528
+000038 R9....... 11A3B484 R10...... 11A3B0B0 R11...... 11200FE4 R12...... 112139B0 reserved. 00000000
+00004C NAB...... 11A3B698 PNAB..... 00000000 reserved. 00000000 00000000
+000064 reserved. 00000000 reserved. 00000002 MODE..... 1120ADB0 reserved. 00000000
+000078 reserved. 00000000 reserved. 112D96E0
CIB for SUB1: 11A3BFB8
+000000 11A3BFB8 C3C9C240 00000000 00000000 010C0004 00000001 00000000 00030119 59C9C2D4 |CIB .........................IBM|
+000020 11A3BFD8 00000000 11A3C0C8 00030C89 59C3C5C5 00000001 00000005 11A3B3B8 914072E8 |.....t.H...i.CEE.........t..j .Y|
+000040 11A3BFF8 00000000 11A3B538 11200298 1120C6F0 0000000B 11A3B538 00000000 00000000 |.....t.....q..F0.....t..........|
+000060 11A3C018 00000000 00000000 11A64240 00000015 00000011 00000001 117537B0 00000011 |.........w. ....................|
+000080 11A3C038 11200FE4 112139B0 00000000 11A3C0B0 114F9EBA 11A3C138 114F4338 00000007 |...U.........t...|...tA..|......|
+0000A0 11A3C058 00000000 11A3C0F8 11A3C104 004F4327 44230000 940C9000 00000009 00000000 |.....t.8.tA..|......m...........|
+0000C0 11A3C078 00000000 11200918 11A3B538 11A3B538 11200296 00000000 0000000A 00000001 |.........t...t.....o............|
+0000E0 11A3C098 11A3B3B8 0000000B 00000064 00000014 00000003 00000000 10000000 00000000 |.t..............................|
+000100 11A3C0B8 00000000 1120C908 11A3C104 11A3C0F8 E9D4C3C8 02000001 00000001 00004A48 |......I..tA..t.8ZMCH............|
Dynamic save area (SUB1): 11A3B538
+000000 11A3B538 10A3B0F0 11A3B3B8 11A3B5F8 912001FE 11537648 11A3B668 11A3B5D0 00000001 |.t.0.t...t.8j........t...t......|
+000020 11A3B558 1120010A 00004A48 11A3B3B8 11200BA8 11200748 11A3B528 11A3B484 11A3B0B0 |.........t.....y.....t...t.d.t..|
+000040 11A3B578 11200FE4 112139B0 00000000 11A3B698 00000000 00000000 00000000 00000000 |...U.........t.q................|
+000060 11A3B598 00000000 00000000 00000002 1120ADB0 00000000 80010000 00000000 112D96E0 |..............................o.|
+000080 11A3B5B8 00000000 00000000 00000000 00000000 00000000 00000000 11A3B668 00000000 |.........................t......|
+0000A0 11A3B5D8 00000000 00000000 00180280 11A3B538 11A3B460 11200EE8 11A3B520 11A3B528 |.............t...t.-...Y.t...t..|
+0000C0 11A3B5F8 11A3B484 00000001 00000000 00000000 00000000 000005D8 112008D8 112008A4 |.t.d...................Q...Q...u|
+0000E0 11A3B618 11200BC8 9153CE54 115476F8 00004A48 4A480100 01A30000 11A5CB38 00000001 |...Hj......8.........t...v......|
+000100 11A3B638 11A5CB38 00000000 11200748 11212648 00000008 11A3B0B0 11200FE4 40404040 |.v...................t.....U |
+000120 11A3B658 00000000 11A3B7E0 40404040 40404040 40404040 11200CBC 11A3B5FC 40404040 |.....t.. .....t.. |
+000140 11A3B678 11200C50 11200C50 11A3B3B8 11A3B450 11A3B498 11A3B498 11A3B498 00000010 |...&...&.t...t.&.t.q.t.q.t.q....|
DSA for SAMPLE: 11A3B3B8
+000000 FLAGS.... 10A3 member... B12C BKC...... 11A3B180 FWC...... 11A3B138 R14...... 91200684
+000010 R15...... 112000D0 R0....... 11A3B520 R1....... 11A3B450 R2....... 00000001 R3....... 112004F2
+000024 R4....... 00004A48 R5....... 11A3B3B8 R6....... 11200BA8 R7....... 11200748 R8....... 11A3B528
+000038 R9....... 11A3B484 R10...... 11A3B0B0 R11...... 11200FE4 R12...... 112139B0 reserved. 00000000
+00004C NAB...... 11A3B538 PNAB..... 00000000 reserved. 00000000 00000000
+000064 reserved. 00000000 reserved. 00000000 MODE..... 00000000 reserved. 00000000
+000078 reserved. 00000000 reserved. 00000000
Dynamic save area (SAMPLE): 11A3B3B8
+000000 11A3B3B8 10A3B12C 11A3B180 11A3B138 91200684 112000D0 11A3B520 11A3B450 00000001 |.t...t...t..j..d.....t...t.&....|
+000020 11A3B3D8 112004F2 00004A48 11A3B3B8 11200BA8 11200748 11A3B528 11A3B484 11A3B0B0 |...2.....t.....y.....t...t.d.t..|
+000040 11A3B3F8 11200FE4 112139B0 00000000 11A3B538 00000000 00000000 00000000 00000000 |...U.........t..................|
+000060 11A3B418 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 |................................|
+000080 11A3B438 00000000 00000000 00000000 00000000 00000000 00000000 11A3B484 11A3B528 |.........................t.d.t..|
+0000A0 11A3B458 11A3B520 00000000 00100000 00000000 00180180 11A3B3B8 00000000 11200E68 |.t...................t..........|
+0000C0 11A3B478 0B300000 11200340 11A3B3B8 00000000 E38599A8 40C78993 9381A297 A8000000 |....... .t......Tery Gillaspy...|
+0000E0 11A3B498 00000001 00000003 00000005 00000001 88000000 11A3B030 11A3B7D8 9140755E |................h....t...t.Qj .;|
+000100 11A3B4B8 112008A8 112008A4 11200BD0 11A3B0F0 914072E8 112014D8 4A480100 01000000 |...y...u.....t.0j .Y...Q........|
+000120 11A3B4D8 11A5CB38 00000001 112014D8 00000000 11A3B308 112139B0 00000000 11A3B538 |.v.........Q.....t...........t..|
+000140 11A3B4F8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 11200CBC |................................|
+000160 11A3B518 11A3B4A4 00000000 11A3B498 11200C50 11A3B488 000D0002 11A3B4A0 00000000 |.t.u.....t.q...&.t.h.....t......|
ENTERPRISE PL/I OPTIONS:
AFP, ARCH( 5), BACKREG(5), BIFPREC(15), CHECK(NOCONFORMANCE, NOSTORAGE), CMPAT(V2), CODEPAGE( 1140), COMMON,
NOCOMPACT, CSECT, CSECTCUT( 4) CURRENCY( $), NODBCS, DECIMAL( FOFLONASGN, NOFORCEDSIGN), DEFAULT( IBM, ASSIGNABLE,
NOINITFILL, NONCONNECTED, DESCRIPTOR, DESCLOCATOR, DUMMY(ALIGNED), ORDINAL(MIN), BYADDR, RETURNS(BYADDR),
LINKAGE(OPTLINK), NORETCODE, NOINLINE, ORDER, NOOVERLAP, NONRECURSIVE, ALIGNED, NULL370, EVENDEC, SHORT(HEXADEC),
EBCDIC, HEXADEC, NATIVE, NATIVEADDR, E(HEXADEC) ), DISPLAY(WTO), NODLLINIT, EXTRN(FULL), NOGRAPHIC, NOINITAUTO,
NOINITBASED, NOINITCTL, NOINITSTATIC, NOINTERRUPT, LIMITS( EXTNAME( 7), FIXEDBIN( 31, 31), FIXEDDEC( 15, 15), NAME( 100
)), OPTIMIZE( 0), PREFIX( CONVERSION, FIXEDOVERFLOW, INVALIDOP, OVERFLOW, PRECTYPE(ANS), NOSIZE, NOSTRINGRANGE,
NOSTRINGSIZE, NOSUBSCRIPTRANGE, UNDERFLOW, ZERODIVIDE), REDUCE, NORENT, RESEXP, RESPECT(), RULES(IBM), NOSTDSYS,
NOSCHEDULER, STRINGOFGRAPHIC(GRAPHIC), SYSTEM(MVS), TEST(ALL ,SYM ,HOOK ,NOSEPARATE), TUNE( 5), USAGE( ROUND(IBM),
UNSPEC(IBM)), WIDECHAR(BIGENDIAN), WINDOW( 1950), WRITABLE, XINFO(NODEF, NOXML)
Static for procedure SAMPLE Timestamp: 2007.01.31 16:02:31 V03.R06.M00: 11200BA8
+000000 11200BA8 11201750 11200CBC 000D0002 00000000 02020240 00000003 02020240 0000000B |...&............... ....... ....|
+000020 11200BC8 02020240 0000000D 02020240 0000000F 02020240 00000021 00000000 11200C00 |... ....... ....... ............|
+000040 11200BE8 00000000 11200CA8 00000000 11200E18 00000000 11200C00 00000000 11200C08 |.......y........................|
+000060 11200C08 00000000 00000000 31010001 00000000 00000000 00000000 31000001 00000000 |................................|
⋮ To understand the dump information and debug this routine, use the following steps:
- Notice the title of the dump: PLIDUMP called from error ON-unit. This was the title specified when PLIDUMP was invoked, and it indicates that the ERROR condition was raised and PLIDUMP was called from within the ERROR ON-unit.
- Locate the messages in the Condition Information section of the
dump.
There are two messages. The current condition message indicates that a prior condition was promoted to the ERROR condition. The promotion of a condition occurs when the original condition is left unhandled (no Enterprise PL/I ON-units are assigned to gain control). The original condition message is CEE3209S The system detected a fixed-point divide exception. The original condition usually indicates the actual problem. For more information about this message, see z/OS Language Environment Runtime Messages.
- In the traceback section, note the sequence of calls in the call chain. SAMPLE called SUB1 at statement 19, and SUB1 raised an exception at statement 27, PU offset X'1C6'.
- Find the statement in the listing for SUB1 that raised the ZERODIVIDE
condition. If SUB1 was compiled with GOSTMT and SOURCE, find
statement 27 in the source listing.
Since the object listing was generated in this example, you can also locate the actual assembler instruction causing the exception at offset X'1C6' in the object listing for this routine, shown in Figure 3. Either method shows that divisor was loaded into register 2 (r2) and used as the divisor in a divide operation.
- You can see from the declaration of SUB1 that divisor is a parameter passed from SAMPLE. Because of linkage conventions, you can infer that register 1 in the SAMPLE save area points to a parameter list that was passed to SUB1. divisor is the first parameter in the list.
- In the SAMPLE DSA, the R1 value is X'11A3B450'. This is the address of the parameter list, which is located in static storage.
- Find the parameter list in the stack frame; the address of the first parameter is X'11A3B484' and the value of the first parameter is X'00000000'. Thus, the exception occurred when SAMPLE passed a 0 value used as a divisor in subroutine SUB1.