linux-kernel - Re: x86: asm doubt

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Message-ID: <49BE5E4E.1070209@redhat.com>
Date:	Mon, 16 Mar 2009 16:12:30 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Sergio Luis <eeeesti@...il.com>, Ingo Molnar <mingo@...e.hu>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@...e.cz>,
	Linux-kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: x86: asm doubt

Jeremy Fitzhardinge wrote:
> In 32-bit mode, moving to a segment register can fault if the 
> underlying GDT/LDT entry is invalid.  In 64-bit mode, segment 
> registers are mostly decorative and have no function, and moving 
> arbitrary values into them doesn't fault, making the exception 
> catching unnecessary.

64-bit mode will in fact fault if an access is made outside the GDT/LDT, 
or of the descriptor is invalid.


-- 
error compiling committee.c: too many arguments to function

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