Re: [Qemu-devel] Monitor Memory Accesses

[Andrea Pellegrini <andrea.pellegrini@gmail.com>]

Thanks for the quick reply!

I obtain the instruction addresses through the function
static TranslationBlock *tb_find_slow(target_ulong pc,
                                      target_ulong cs_base,
                                      uint64_t flags)

......
// Andrea, let's check the pc
    printf("PC: 0x%x\n", pc);
....

in cpu_exec.c. So far it worked but maybe there is a better way to do 
it. Where can I find more informations about the "helper"?
I'm just starting working with Qemu so I'm still not 100% sure about 
what is going on.  :-P

I searched in target-i386/translate.c for
tcg_gen_qemu_ld
or
tcg_gen_qemu_lst
and nothing pops up. Am I looking at the right thing?
Thanks
~Andrea


Laurent Desnogues wrote:
> On Wed, Feb 18, 2009 at 1:48 PM, Andrea Pellegrini
> <andrea.pellegrini@gmail.com> wrote:
>   
>> I want to track all the memory accesses performed in a program execution.
>> Right now I'm working on an amd64 machine with target x86_64 but eventually
>> I would like to do the same for other architectures (at least ARM and PPC).
>> With few changes I was able to print out the address of the instructions
>> that the processor executes (well at least the first address of the basic
>> block)
>>     
>
> I guess you're doing that by calling a helper.  If you don't, that
> won't work :-)
>
>   
>> and now I was looking for a way to record all memory loads and
>> stores. I believe I have to change some code in the file translate.c and I
>> was wondering if anybody can give me a quick help about which part of code I
>> should change. It would be great if I could call a function right before
>> every time a load or store is executed.
>>     
>
> You should look for parts of translate.c that generate target loads
> and stores;  basically look for calls to tcg_gen_qemu_ld* and
> tcg_gen_qemu_st*.
>
>
> Laurent
>
>
>
>