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Re: [Xen-devel] how can I find code of hypercall?
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] how can I find code of hypercall? |
| From: | leilei175 <leilei175@xxxxxxxxx> |
| Date: | Wed, 11 Mar 2009 20:37:15 +0800 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Jayaraman, Bhaskar" <Bhaskar.Jayaraman@xxxxxxx> |
| Delivery-date: | Wed, 11 Mar 2009 05:37:41 -0700 |
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Hi, keir and Jayaraman, Thanks for your explanation Keir Fraser wrote: On 11/03/2009 10:08, "Jayaraman, Bhaskar" <Bhaskar.Jayaraman@xxxxxxx> 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 0xccccccc3You 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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