Date: Wed, 28 Jan 2004 15:25:51 -0500
From: Daniel Jacobowitz <dan@debian.org>
To: linux-kernel@vger.kernel.org
Subject: Re: long long on 32-bit machines
Message-ID: <20040128202551.GA16884@nevyn.them.org>
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References: <26879984$107531702940180925001758.71044950@config16.schlund.de>
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On Wed, Jan 28, 2004 at 08:22:01PM +0100, Arnd Bergmann wrote:
> 
> H.P.A wrote:
> 
> > Does anyone happen to know if there are *any* 32-bit architectures (on 
> > which Linux runs) for which the ABI for a "long long" is different from 
> > passing two "longs" in the appropriate order, i.e. (hi,lo) for bigendian 
> > or (lo,hi) for littleendian?
> 
> Some architectures require long long arguments to be passed as an
> even/odd register pair. For example on s390, 
> 
>    void f(int a, int b, long long x) 
> 
> uses registers 2, 3, 4 and 5, while 
> 
>    void f(int a, long long x, int b)
> 
> uses registers 2, 4, 5 and 6. AFAIK, mips does the same, probably others
> as well.

Yes.  Also, IIRC, one of SH3 and SH4 requires the padding, and the
other doesn't.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer
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