linux-kernel - Re: syscall macro fails upon compilation

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Message-ID: <468E7985.7050502@zytor.com>
Date:	Fri, 06 Jul 2007 10:19:01 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Gautam Singaraju <gautam.singaraju@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: syscall macro fails upon compilation

Andi Kleen wrote:
>> They were *always* broken for 64-bit arguments on 32-bit machines, however.
> 
> Well syscall() doesn't support that at all (unless you split by hand)
> 

On i386 it just happens to work, because the calling convention is
equivalent.  On some other 32-bit platforms it works that way as well;
on others, it fails.

To do it right you need a proper assembly stub generator.

	-hpa

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