Re: [Qemu-devel] qemu log function to print out the registers of the guest

[Steven <wangwangkang@gmail.com>]

On Thu, Aug 16, 2012 at 1:00 PM, Max Filippov <jcmvbkbc@gmail.com> wrote:
> On Thu, Aug 16, 2012 at 8:36 PM, Steven <wangwangkang@gmail.com> wrote:
>> On Thu, Aug 16, 2012 at 4:02 AM, 陳韋任 (Wei-Ren Chen)
>> <chenwj@iis.sinica.edu.tw> wrote:
>>>> I would like to is there any function that could log the register
>>>> content of the guest machine, like "info registers" in the qemu
>>>> monitor mode.
>>>
>>>   Why not check how "info registes" be implemented in QEMU? ;)
>>> I guess you just have to log env->regs or something like that.
>> Thanks for pointing this out.
>> I would like to get a trace of guest memory access. So I can not use
>> "info registers".
>> What I want to do is that when tcg fetches a load instruction at
>> disas_insns(), the guest memory address should be calculated. For
>
> No, you don't want this, because the same translated code may be
> invoked multiple times with different values in registers.
>
>> example, the tb has an instruction of mov 0x4(%ebx)  %eax.
>> To calculate the address of 0x4(%ebx), I need to know the value of %ebx.
>> Is this correct? Thanks.
>
> Why don't you just instrument actual memory access functions in
> softmmu_template.h ?
But this code only touches the s->pc. For registers in the load
instruction, it won't generate the memory access code. So I need to
add code to some function to get the guest memory address access.
>
> --
> Thanks.
> -- Max