linux-kernel - Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel.

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Date:	Sun, 27 Aug 2006 19:49:31 +1000
From:	Keith Owens <kaos@....com.au>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	linux-kernel@...r.kernel.org,
	Chuck Ebbert <76306.1226@...puserve.com>,
	Zachary Amsden <zach@...are.com>,
	Jan Beulich <jbeulich@...ell.com>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel. 

Jeremy Fitzhardinge (on Sun, 27 Aug 2006 01:44:20 -0700) wrote:
>2: entry.S constructs the stack in the shape of struct pt_regs, and this
>   is passed around the kernel so that the process's saved register
>   state can be accessed.
>--- a/arch/i386/kernel/entry.S
>+++ b/arch/i386/kernel/entry.S
>@@ -30,12 +30,14 @@
>  *	18(%esp) - %eax
>  *	1C(%esp) - %ds
>  *	20(%esp) - %es
>+ *	24(%esp) - %fs	(not saved/restored)
>+ *	28(%esp) - %gs
>+ *	2C(%esp) - orig_eax
>+ *	30(%esp) - %eip
>+ *	34(%esp) - %cs
>+ *	38(%esp) - %eflags
>+ *	3C(%esp) - %oldesp
>+ *	40(%esp) - %oldss
...
>+FS		= 0x24
>+GS		= 0x28
>+ORIG_EAX	= 0x2C
>+EIP		= 0x30
>+CS		= 0x34
>+EFLAGS		= 0x38
>+OLDESP		= 0x3C
>+OLDSS		= 0x40

Now would be a good time to get rid of those hard coded numbers and use
asm-offsets instead.

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