C stack

Hi, I'm trying to write an interface for a C library that uses a Boehm type garbage collector. So, I need to get the address of the bottom of the C stack. In a C application this would look something like: main() { int bottomOfStack; } Where "&bottomOfStack" would be the thing I need. So, I'd want some function like: bottomOfStack :: IO Addr Would it be possible at all to make an interface to a C library that uses Boehm's garbage collection ? What Boehm's algorithm does is traverse the C stack at each garbage collect marking all accessible nodes and then sweeping all unmarked nodes. Would this cause problems with the C code generated by ghc ? Jan