>          BAKR  R0,R0
>          MSTA  R0 
>          MSTA  R12 
>          MODESET MODE=SUP,
>                KEY=ZERO 
>          L     R11,PSAAOLD-PSA 
>          SETLOCK OBTAIN, 
>                ASCB=(11), 
>                TYPE=CML, 
>                MODE=UNCOND 
>          XR    R4,R4 
>          L     R7,PSAAOLD-PSA
>          STORAGE OBTAIN, 
>                LENGTH=LCLDSCTL, 
>                SP=244, 
>                LOC=(31,31), 
>                CAUB=CURRENT, 
>                OWNER=HOME, 
>                LINKAGE=BRANCH 
>          LR    R11,R1 
>          LR    R0,R1 
>          XR    R14,R14 
>          XR    R15,R15 
>          L     R1,=AL4(WORKAREA) 
>          MVCL  R0,R14 
> 
> Everything up to the STORAGE OBTAIN seems to work but w/trying to chain
> backward / forward save area's (no I not really using the linkage 
stack),
> I get a S0C4-4 ??... I understand the S0C4 because R1 is zeroes ... but 
...
> why ??. My LTR after the STORAGE OBTAIN does not catch a failure. 
> 
> The only reason I'm trying to use the linkage stack is because this is 
at
> the very start of my program.
> 
> The trace table shows the SSRV for the OBTAIN .. but it's obviously
> failing... 

  It's not failing.  If it was failing, with the default of COND=NO, 
you would have gotten an ABEND.  What is in the SSRV   78   trace entry?
What is LCLDSCTL, which you used as a length specification? 

Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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