RE: [Valgrind-developers] Matching function calls with returns

[Nicholas N. <nj...@ca...>]

On Wed, 23 Jun 2004, Chris January wrote:

>> A better way for matching call/ret pairs, or a better way for
>> the trampoline bit?  If the latter, can you give more detail
>> about your current approach -- the description you've given
>> is too vague to be much use.  Can you insert UCode before a
>> RET that calls your trampoline code?
>
> No, I can't insert UCode before a RET because I don't want to instrument
> the code that's being called.
> [snip]
> Unfortunately VG_(emit_code) complains the Ucode isn't sane
> (specifically the first POP instruction).

POPs have to be paired with PUSHes, and can only be used in conjunction 
with CALLM, I think.

I'm still not clear what it is you want to do.  Perhaps you can give a 
more detailed example, showing some assembly code or UCode, and exactly 
what effect you are trying to achieve?

N