linux-kernel - Re: [PATCH 5/6] Begin abstraction of sensitive instructions: asm files

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Message-ID: <200607212326_MC3-1-C5B8-F9ED@compuserve.com>
Date:	Fri, 21 Jul 2006 23:23:03 -0400
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] Begin abstraction of sensitive instructions:
  asm files

In-Reply-To:<1153527274.13699.36.camel@...alhost.localdomain>

On Sat, 22 Jul 2006 10:14:34 +1000, Rusty Russell wrote:
>
> Abstract sensitive instructions in assembler code, replacing them with
> macros (which currently are #defined to the native versions).  We use
> long names: assembler is case-insensitive, so if something goes wrong
> and macros do not expand, it would assemble anyway.
...
> --- working-2.6.18-rc2-hg-paravirt.orig/arch/i386/kernel/entry.S      2006-07-21 21:09:22.000000000 +1000
> +++ working-2.6.18-rc2-hg-paravirt/arch/i386/kernel/entry.S   2006-07-22 04:32:25.000000000 +1000
> @@ -76,8 +76,15 @@
>  NT_MASK              = 0x00004000
>  VM_MASK              = 0x00020000
>  
> +/* These are replaces for paravirtualization */
> +#define DISABLE_INTERRUPTS           cli
> +#define ENABLE_INTERRUPTS            sti
> +#define ENABLE_INTERRUPTS_SYSEXIT    sti; sysexit
> +#define INTERRUPT_RETURN             iret
> +#define GET_CR0                      movl %cr0, %eax
> +
 
Could you change GET_CR0 to MOV_CR0_EAX?  GET_CR0 seems like it's
taking a reference or something.

-- 
Chuck
And did we tell you the name of the game, boy, we call it Riding the Gravy Train.
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