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

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Message-ID: <4B9E4EB1.9010800@zytor.com>
Date:	Mon, 15 Mar 2010 08:13:53 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel@...savvy.com,
	drepper@...hat.com, torvalds@...ux-foundation.org,
	munroesj@...ux.vnet.ibm.com
Subject: Re: 64-syscall args on 32-bit vs syscall()

On 03/15/2010 06:44 AM, Ralf Baechle wrote:
> 
> Syscall is most often used for new syscalls that have no syscall stub in
> glibc yet, so the user of syscall() encodes this ABI knowledge.  If at a
> later stage syscall() is changed to have this sort of knowledge we break
> the API.  This is something only the kernel can get right.
> 

One option would be to do a libkernel.so, with auto-generated stubs out
of the kernel build tree.  As already discussed in #kernel this morning,
there are a number of sticky points with types and namespaces for this
this, but those aren't any worse than the equivalent problems for
syscall(3).

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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