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From: leilei175 <leilei175@gmail.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	"Jayaraman, Bhaskar" <Bhaskar.Jayaraman@lsi.com>
Subject: Re: how can I find code of hypercall?
Date: Wed, 11 Mar 2009 20:37:15 +0800	[thread overview]
Message-ID: <49B7B07B.60302@gmail.com> (raw)
In-Reply-To: <C5DD423F.4C68%keir.fraser@eu.citrix.com>

Hi, keir and Jayaraman,
Thanks for your explanation

Keir Fraser wrote:
> On 11/03/2009 10:08, "Jayaraman, Bhaskar" <Bhaskar.Jayaraman@lsi.com> wrote:
>
>   
>> I've done this on an HVM. For Intel, you can go to platform-pci and dump the
>> hypercall page on the console 4 bytes at a time. Each 4 byte value on the
>> hypercall page constitutes an Intel x86 instruction, and you should find
>> something like this: -
>> 0xc1010f00 
>> 0xccccccc3 
>>     
>
> You know x86 instructions are not fixed-length, right? Actually the
> instruction sequence is:
>  0xb8 <imm32>   : mov imm32,%eax (5-byte instruction)
>  0x0f 0x01 0xc1 : vmcall (3-byte instruction)
>  0xc3           : ret (1-byte instruction)
>
> See xen/arch/x86/hvm/vmx/vmx.c:vmx_init_hypercall_page().
>
>  -- Keir
>
>
>
>   

      parent reply	other threads:[~2009-03-11 12:37 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-11  9:52 how can I find code of hypercall? leilei175
2009-03-11 10:08 ` Jayaraman, Bhaskar
2009-03-11 10:26   ` Keir Fraser
2009-03-11 11:46     ` Jayaraman, Bhaskar
2009-03-11 14:16       ` Goswin von Brederlow
2009-03-11 12:37     ` leilei175 [this message]

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