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From: Paul Mackerras <paulus@samba.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: klibc list <klibc@zytor.com>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: long long on 32-bit machines
Date: Thu, 29 Jan 2004 22:02:42 +1100	[thread overview]
Message-ID: <16408.59474.427408.682002@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <4017F991.2090604@zytor.com>

H. Peter Anvin writes:

> 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?

Are you are talking about passing arguments to a function?  PPC32
passes long long arguments in two registers in the order you would
expect (hi, lo), BUT you have to use an odd/even register pair.  In
other words, if you have a function like this:

	int foo(int a, long long b)

then a will be passed in r3 and b will be passed in r5 and r6, and r4
will be unused.

Regards,
Paul.

  parent reply	other threads:[~2004-01-31  6:04 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
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 [this message]
2004-01-31  6:08   ` H. Peter Anvin
2004-01-31 12:23     ` [klibc] " Arnd Bergmann
2004-01-31 19:41       ` H. Peter Anvin
2004-02-01  0:41     ` Paul Mackerras
2004-01-28 19:22 Arnd Bergmann
2004-01-28 20:25 ` Daniel Jacobowitz
2004-01-28 20:51 Ulrich Weigand
2004-01-29  1:34 ` H. Peter Anvin
2004-01-29  9:19   ` Arnd Bergmann

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