linux-kernel - Re: 64-syscall args on 32-bit vs syscall()

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Date:	Thu, 18 Mar 2010 17:21:06 +0100
From:	Andreas Schwab <schwab@...hat.com>
To:	munroesj@...ibm.com
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ulrich Drepper <drepper@...hat.com>,
	David Miller <davem@...emloft.net>, ralf@...ux-mips.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...savvy.com, torvalds@...ux-foundation.org
Subject: Re: 64-syscall args on 32-bit vs syscall()

Steven Munroe <munroesj@...ux.vnet.ibm.com> writes:

> extern long int syscall (long int __sysno, ...) __THROW;
>
> #endif	/* Use misc.  */
>
> Changing this would be an ABI change and would have to be versioned. It
> would effect any one using syscall not just SYS_fallocate.
>
> the question is do programmers in practice include unistd.h when they
> use syscall.
>
> If the changed prototype is not in scope then the 1st parm (__sysno)
> defaults to int and is passed in on r3 which gets moved to r0.

int is incompatible with long, so you already get undefined behaviour
anyway.

Andreas.

-- 
Andreas Schwab, schwab@...hat.com
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