> Any assistance would be greatly appreciated.
>
> I am working on a SNA interface for a batch framework. This is mostly just
> a massive learning exercise that will likely never be utilized, but I have
> learned SO much while working on this project (currently 6 years in the
> making).
I'm confused about what this is part of. Is this a TSO program
or something else (saying SNA? VTAM APPL?).
I ask that because as far as I know GTTERM is TSO only. But
you got return code 0 so perhaps the GTTERM is being issued
from TSO.
> The address space accepts terminals with MOD2 terminals and everything
"Terminals" plural. A TSO session with more than one?
> I check register 15 after the SVC, and it is zero. But the SVC parameter
> values are still zero.
When using MF=L and MF=E macro forms, usually it's necessary to copy
an MF=L list into the DSECT area before using the MF=E form...
This is not true for all macros, but perhaps for GTTERM.
So somewhere in the source should be a GTTERM MF=L and then it should
be copied (MVC) into GTTLIST in the DSECT before issuing the GTTERM
MF=(E,GTTLIST). I'd suggest looking at the full expansion of the GTTERM
(both MF=L and MF=E) to see if this is needed.
Other points:
> WORKREG EQU R3
> SESSREG EQU R5
I've only used 16 registers R0->R15. You can do what you want but I'd
be very careful that additional register equates didn't result in some
duplicate register usage. I saw some IBM source which had:
R15 EQU R9
I'd prefer better comments, or when trivial, no comment. As an
example:
> LR R2,R1 SAVE REGISTER 2
This appears backwards, saving R1 in R2. Also R2 is a problematic
register as some hardware instructions alter it without it being specified
(TRT translate and test at least). I'd be careful when I used it and
treat it as a bit less temporary than R0, R1, R14, R15.
More comments on comments (& register usage):
> LR R6,WORKREG LOAD REGISTER
> LA R8,0 SET DUMMY FROM ADDRESS
> XR R9,R9 SET PADDING TO LOW VALUES
> MVCL R6,R8 INITIALIZE AREA
I'd suggest something like:
LR R6,WORKREG @ workarea to clear, len in R7
SR R15,R15
MVCL R6,R14
The contents of R14 don't matter for the MVCL as the length in R15 is zero.
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