linux-kernel - Re: X32 psABI status

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Message-Id: <201102132328.15360.arnd@arndb.de>
Date:	Sun, 13 Feb 2011 23:28:14 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	x32-abi@...glegroups.com, "H.J. Lu" <hjl.tools@...il.com>,
	GCC Development <gcc@....gnu.org>,
	GNU C Library <libc-alpha@...rceware.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: X32 psABI status

On Sunday 13 February 2011, H. Peter Anvin wrote:
> The actual idea is to use the i386 compat ABI for memory layout, but
> with a 64-bit register convention.  That means that system calls that
> don't make references to memory structures can simply use the 64-bit
> system calls, otherwise we're planning to reuse the i386 compat system
> calls, but invoke them via the syscall instruction (which requires a new
> system call table) and to pass 64-bit arguments in single registers.

As far as I know, any task can already call both the 32 and 64 bit syscall
entry points on x86. Is there anything you can't do just as well by
using a combination of the two methods, without introducing a third one?

	Arnd
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