Assmebler code for converting STRING Format into TABLE

ram2009 · New User Joined: 04 May 2009 Posts: 14 Location: chennai

PRINT NOGEN
FILEASM CSECT
STM 14,12,12(13)
BALR 12,0
USING *,12
ST 13,SAVE+4
LA 13,SAVE
OPEN (OUTDCB,(OUTPUT))
STRING DC X'03020100'
TABLE DC X'FF01AABB00'
TR STRING,TABLE
MVC 2,STRING
PUT OUTDCB,2
CLOSE OUTDCB
L 13,SAVE+4
LM 14,12,12(13)
OUTDCB DCB DSORG=PS,MACRF=(PM),DDNAME=OUTDISK, *
RECFM=FB,LRECL=80,BLKSIZE=800
SAVE DS 18F
END

This was my assmebler code for converting the STRING Format into TABLE format. I compiled the program successfully. But when i tried to run it I ended it in a s0c1 abend.
Pls guide me to sort it out..

enrico-sorichetti · Posted: Mon Feb 08, 2010 4:12 pm

You should remember that execution is sequential...
the open statement generates some machine code instructions...
after that other machine code instructions are expected,
You put Your constants in the wrong place and the CPU tries to execute them
as machine instructions

ram2009 · New User Joined: 04 May 2009 Posts: 14 Location: chennai

even i rearrange, i get the same error...
Is there any error in the logic?

enrico-sorichetti · Posted: Mon Feb 08, 2010 6:00 pm

Bill O'Boyle · Posted: Mon Feb 08, 2010 7:16 pm

Beside Enrico's suggestion about reviewing the MVC, I think the Assembler believes that STRING is an instruction. After the OPEN Macro expansion, the logic falls right into this label. When the Assembler tries to interpret a X'03' as an OP CODE, it can't, because it doesn't exist. So, you wind up with an invalid OP CODE (IE: SOC1).

You should move your DS and DC definitions out of the execution path and place them after the the 18-WORD register-savearea, but still, the MVC syntax is way off.

Download the latest/greatest Reference Summary and save as a favorite -

publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/download/DZ9ZS004.pdf?DT=20080216193251&XKS=DZ9ZBK08

Bill