> Hi, all:
>
> I am trying to use valgrind to do value profiling at specified address of
> guest instruction.
>
> By adding my own instrumentation codes for each Ist_Mark in the
> MC_(instrument) function, as the way Lackey does, I am able to pause the
> guest program at specific instruction address and then do value profiling
> thanks to Memcheck .
>
> However, in this way, the instrumentation codes RUNS BEFORE the corresponding
> guest instructions. for example:
> int j=10;
> 8048416: ... movl $0xa,0x18(%esp)
> 8048416 is the address of guest instruction.If I check the value of j in the
> instrumentation codes, i will get a garbage value instead of 10, because the
> movl instruction has not executed yet.
> I want to check the value of j, AFTER this instruction(movl) executed. But I
> don't know how?
>
> My guess is it has something to do with the JIT dispatcher, is there an
> command option that I could use or there is a better way to add
> instrumentation code?
>
> Thanks a lot for your time and efforts.
>
> --
> Regards
> Jersey Zhang
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