From: Daniel Jacobowitz <dan@debian.org>
To: linux-kernel@vger.kernel.org
Subject: Re: long long on 32-bit machines
Date: Wed, 28 Jan 2004 15:25:51 -0500 [thread overview]
Message-ID: <20040128202551.GA16884@nevyn.them.org> (raw)
In-Reply-To: <26879984$107531702940180925001758.71044950@config16.schlund.de>
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
next prev parent reply other threads:[~2004-01-28 20:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-28 19:22 long long on 32-bit machines Arnd Bergmann
2004-01-28 20:25 ` Daniel Jacobowitz [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-01-28 20:51 Ulrich Weigand
2004-01-29 1:34 ` H. Peter Anvin
2004-01-29 9:19 ` Arnd Bergmann
2004-01-28 18:04 H. Peter Anvin
2004-01-28 19:12 ` Timothy Miller
2004-01-28 19:15 ` David S. Miller
2004-01-29 11:02 ` Paul Mackerras
2004-01-31 6:08 ` H. Peter Anvin
2004-02-01 0:41 ` Paul Mackerras
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