> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of Jim Mulder
>
> > We'd still like to know why loading the program from a PDSE apparently
> > changed how (and more importantly, where) the system passed the PARM=
> > string.
>
> PDSEs are 4K page oriented, so when loaded, they are generally going to
> start at a 4K boundary.
> When loading from a PDS, fetch processing simply does a GETMAIN for the
> storage. If the size of the
> module is at least 2 pages, but not a page multiple, the Getmained storage
> (and thus the load module)
> will be aligned to end on a 4K boundary if D DIAG shows VSM
> USEZOSV1R9RULES(YES) or it will be aligned
> to start on a 4K boundary if you have VSM USEZOSV1R9RULES(NO)
>
> Your results suggest that you are using the default of VSM
> USEZOSV1R9RULES(YES).
Correct. So that suggests that, when the program was loaded from a PDS, it got
loaded at whatever doubleword-aligned address the GETMAIN happened to acquire,
which was not necessarily on a page boundary. In fact, the load module is more
than two pages in length but less than three pages, so it appears it was "just
lucky" that the "insertion" of the flag byte at the end of the PARM string
didn't cause (even) a S0C4.
I think we discussed changing to VSM USEZOSV1R9RULES(NO) when we migrated from
1.9 to 1.11, but apparently it "got lost in the shuffle". And now we're
preparing for z/OS 2.1 (or its follow-on), from 1.13.
> I would expect the location of the PARM= string to be the same, regardless
> of PDS vs. PDSE. However,
> I would expect that changing the setting for VSM USEZOSV1R9RULES will change
> the location of the PARM=
> string.
I think I've lost the link I had to documentation on USEZOSV1R9RULES; can you
provide a current one, please?
Thanks,
-jc-
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