[Xen-devel] instrction emulation problem

["strongerwill" <strongerwill@xxxxxxxxx>]

Hi Keir:

   I am sorry trouble you again. I want to emulate instruction "push %ebp" in Xen. I found the function emulate_privilege_op does not satisfy this requirement.

Then I resort to x86_emulate. I construct the x86_emulate_ctxt and reuse the "ptwr_emulate_ops".

code like this:

 

extern const struct x86_emulate_ops ptwr_emulate_ops;

in do_general_protection {

....

struct x86_emulate_ctxt ctxt;

ctxt.regs = regs;

ctxt.force_writeback = 1; // 0 is the same

ctxt.addr_size = 32;

ctxt.sp_size   = 32;

ret = x86_emulate(&ctxt, &ptwr_emulate_ops);

...

}

 

the error message is:

(XEN) mm.c:5235:d0 ptwr_emulate: bad access (cr2=553a4000, addr=e81b5fac, bytes=4)

 

 

I have another idea, I directly update the stack and change the EIP and ESP

like this:

 

regs->esp -= 4;

__raw_copy_to_guest((void*)regs->esp, &regs->ebp, sizeof(unsigned int));

regs->eip += 1;

 

I am not sure it works like this way. Please give me some tips. Thanks

 

Cheers,

 

Yueqiang

 

 

2010-08-13

---

strongerwill

---

发件人： Keir Fraser

发送时间： 2010-08-13  16:52:24

收件人： xen-devel@xxxxxxxxxxxxxxxxxxx

抄送：

主题： [Xen-devel] FINAL release candidate for Xen 4.0.1

 

Folks,

The sixth release candidate for 4.0.1 is tagged as 4.0.1-rc6 at

http://xenbits.xen.org/staging/xen-4.0-testing.hg

We expect this to be the final RC, with no changes except for regression

fixes ahead of final release late next week. So please test this RC!

 Thanks,

 Keir

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