MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <16408.59474.427408.682002@cargo.ozlabs.ibm.com>
Date: Thu, 29 Jan 2004 22:02:42 +1100
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
In-Reply-To: <4017F991.2090604@zytor.com>
References: <4017F991.2090604@zytor.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 906
Lines: 24

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.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/