Re: Where do I start?

On Tue, May 25, 2010 at 6:33 PM, Rick Fochtman <[email protected]> wrote:

>
>
>  -------------------------------<snip>-----------------------------
>
> For that chunk of assembly language I begged earlier
>
> It looks like the following registers are unused:  (they are not mentioned
> in the program)
>      0 ?
>      2,3
>      5,6,7
>      9,10,11
> ----------------------------<unsnip>------------------------------
> That's not at all unusual. Just because you have 16 registers (0-15)
> available doesn't mean you have to use them. :-)
>

I saw what some of them do in some assembly tutorial somewhere..

R01 mvs parmlist
R13 calling program's save area
R14 Return to Calling programs's return address.
R15 My own entrypoint



>
> Some of those registers you didn't mention have special uses in entry/exit
> linkage. 0,1,13,14,15 are linkage registers, with well-defined purposes
> during entry/exit linkage.
>
> Rick<[email protected]?subject=Re:%20%5Bturnkey-mvs%5D%20Where%20do%20I%20start?>
>  
>