Re: [PATCH] man2 : syscall.2 : document syscall calling conventions

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On Sun, 2013-04-07 at 09:55 -0400, Kyle McMartin wrote:
> On Sun, Apr 07, 2013 at 12:00:50PM +0200, Michael Kerrisk (man-pages) wrote:
> > [Adding a few people to CC who may be able to help with Mike's doubts
> > on PA-RISC; folks, if any of you could have a quick look at the parisc
> > piece below, that would be helpful]
> > 
> 
> The syscall number is in %r20, everything else looks correct. The
> returned value is in %r28 and the args are %r26 through %r21.

Actually, that's not quite correct.  on 64 bits it's arg1-8 are %r26-%
r19 but on 32 the convention is that arg1-arg4 are %r26-%r23 and the
rest on stack.  We can also do register pair combining on 32 bits for a
64 bit argument.

Our register use is documented in 

Documentation/parisc/registers

James


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