linux-kernel - Re: [tip:x86/asm] x86-64: Use normal ptregs stub for execve

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Message-ID: <4B6069A7.1020907@zytor.com>
Date:	Wed, 27 Jan 2010 08:28:23 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Brian Gerst <brgerst@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/asm] x86-64: Use normal ptregs stub for execve

On 01/27/2010 07:21 AM, Brian Gerst wrote:
> 
> I see what is going on.  Grub is a 32-bit statically linked executable
> even on a 64-bit distro.  The old execve stub forced return to
> userspace via iret, but PTREGSCALL apparently doesn't.  This means
> that the 32-bit %cs isn't getting set.  Drop this patch for now.
> 

OK, I presume that breaks execing any 32-bit app, not just statically
linked (eww...)

Yet one more case of Grub making me shudder, though :-/

	-hpa

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

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