Implementing own stack

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Hi,
I want to alter the program stack before executing
some kernel functions. Lets say I have a call chain
fa()->fb()->fc()... and I want to change the stack at
the point fa()->fb(). 
I also have an array 
int static_stack[4096];
For simplicity assume, fb() takes no arguments and
4096*4 bytes is enough for stack space of
fb()->fc()...
Then should I just not be able to make this work by
simply modifying esp? It doesn't seem to work though.
Thanx 


 
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