Re: [Qemu-devel] TCG flow vs dyngen

[Stefano Bonifazi <stefboombastic@gmail.com>]

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On 01/24/2011 07:02 PM, Dushyant Bansal wrote:
> On Monday 24 January 2011 08:26 PM, Stefano Bonifazi wrote:
>> On 01/24/2011 03:32 PM, Peter Maydell wrote:
>>>
>>> Being a JIT doesn't prohibit counting target instructions executed.
>>> It just means that counting them generally requires generating
>>> code to do the counting at runtime, so it's a more complicated
>>> change to make than it would be in a non-JIT emulator.
>>>
>> What do you mean? Should I change the code of qemu-user for counting 
>> the instructions, or should I add code into the target binaries?
> You should see this pdf 
> (www.ecs.syr.edu/faculty/yin/Teaching/TC2010/Proj4.pdf). It talks 
> about tracing the instructions.
>
> --
> Dushyant
Wow thank you! It sounds incredibly interesting!!
> What we really need is to insert a function call into the
> translated code, so when each instruction is executed at runtime, our 
> inserted function will be
> executed.
Again wow!! Is that really possible? Some sort of callback triggered at 
every instruction execution?
Do you have any another document explaining that?
This pdf just gives instructions on how to do it on an old version of 
qemu (disas_insn doesn't exist at all on my code now), and does not 
explain what it is, what's behind that suggested code ..
Also the code for single step would be of great help to me! I really 
needed that.. but when I tried it on qemu-user didn't work at all..
Thank you very much!
Best regards,
Stefano B.




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