On Fri, 4 Apr 2003, Lucius, Leland wrote:
> Hi Paul,
>
> I did something similar. Except I took C source, compiled it under Linux,
> used TAS to assemble it, and linked it up on OS/390 to produce non-LE based
> zlib and bzip2 libraries. You can find the libraries in the assembler
> section over at http://www.homerow.net, but here's a snippet from the readme
> that might help you out:
>
> HOW TO USE
>
> Since GCC was used to build the object, the standard OS linkage
> conventions are not used. You will need to pay attention to a
> few things when using the library.
>
> First, you HAVE to provide a stack before calling any of the
> functions. A 4096 byte stack seems to be sufficient.
>
> The address of the stack is placed in register R15 and, since the
> stack is of the top-down variety, the address MUST point to the
> end of the stack minus the first frame. Each frame is 96 bytes
> unless a function requires more than 5 parameters.
>
> For instance, calling BZ2_bzBuffToBuffCompress() would require you
> to reserve the standard 96 bytes, plus 8 more since it has 7
> parameters. So:
>
> L R15,Stkptr Get address of stack
> AL R15,=F'4096' Point to end of stack
> SL R15,=F'104' Reserve first frame
These last two seem equivalent to
LA 4096-104(,R15)
and faster (no storage reference) and 12 bytes shorter.
Okay, I'll stop here;-)
--
Cheers
John.
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