Code instrumentation with GCC

[Narech K]

Hi,

Is there a way to make GCC to instrument every function it compiles with a 
prologue/epilogue call to a user defined code a la MSVC's _penter and 
_pexit, e.g.:

http://msdn.microsoft.com/en-us/library/c63a9b7h.aspx
http://msdn.microsoft.com/en-us/library/xc11y76y.aspx

If not, can anyone suggest a place in GCC's source to look at if one was to add
such functionality self.


Thanks,

- NK