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Error 0C1 Reason Code 1 with branch instructions


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Hatam008

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Joined: 22 Dec 2020
Posts: 1
Location: United States

PostPosted: Tue Dec 22, 2020 1:57 pm
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Hi,
I got this system dump out in the middle of an assembly program that refers to a branch instruction (code snippet is available at the end of the post).

Here is the error :
Code:

IEA995I SYMPTOM DUMP OUTPUT  411                             
SYSTEM COMPLETION CODE=0C1  REASON CODE=00000001             
 TIME=11.33.48  SEQ=00396  CPU=0000  ASID=0026               
 PSW AT TIME OF ERROR  078D2000   00007156  ILC 2  INTC 01   
   ACTIVE LOAD MODULE           ADDRESS=00007108  OFFSET=0000
   NAME=GO                                                   
   DATA AT PSW  00007150 - 5920C18A  00000000  41400002     
   AR/GR 0: 80B933BA/FD000008   1: 00000000/0000723F         
         2: 00000000/00000010   3: 00000000/007D09D4         
         4: 00000000/007D09B0   5: 00000000/007F17F0         
         6: 00000000/007C2FE0   7: 00000000/FD000000         
         8: 00000000/007F1C18   9: 00000000/007F1060         
         A: 00000000/00000000   B: 00000000/007F17F0         
         C: 00000000/4000710E   D: 00000000/00006F60         
         E: 00000000/80FCB968   F: 00000000/00007108         
 END OF SYMPTOM DUMP           


and the code is :


Code:

            C       2,=F'0'
            BE     FIN
            ...
            ...
FIN       ...
 


Thanks for your time and consideration
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sergeyken
Warnings : 2

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Joined: 29 Apr 2008
Posts: 1009

PostPosted: Tue Dec 22, 2020 7:10 pm
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It shows that your original BE FIN instruction has been overridden with zeroes: X’00000000’ - somehow, before your program has reached this point.

BTW: ABEND S0C1 means “invalid instruction code”, which is X’00’ in this case.

The location pointed by PSW:
X’5920C18A’ - seems to be C 2,=F’0’
X’00000000’ - former BE FIN, now erased
X’41400002’ - seems to be LA 4,2
(if only I still remember the instruction codes...)

Check, or trace the logic of your code.
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steve-myers

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Joined: 30 Nov 2013
Posts: 882
Location: The Universe

PostPosted: Wed Dec 23, 2020 12:51 am
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DO NOT assume 5920C1BA is an instruction. It may be the last 4 bytes of a 6 byte instruction
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sergeyken
Warnings : 2

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Joined: 29 Apr 2008
Posts: 1009

PostPosted: Wed Dec 23, 2020 1:53 am
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steve-myers wrote:
DO NOT assume 5920C1BA is an instruction. It may be the last 4 bytes of a 6 byte instruction

Based on PSW, and R12, and instruction code + operands, the probability is 99.5%
Especially if the next instruction after BE FIN is really LA 4,2 - then I’m 100% sure.
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