Very Computer

1. how to know the instruction address of calling function within called function?

Suppose function A call B, are there any ways to know the address of last instruction in A just
before calling B from within B? I would like to do some profiling by substituting B by a routine with record
the time spent on B. I also would like to know the time spent on B in different locations of A
where B is called. If I can know the address of last instruction in A just before calling B, from
debuging info of the excutables, I can find its source code address, therefore know the
time spent on B in differnet locations of A.

I don't want to make any changes to A. "-pg" compiler option for profiling is of no use either,
because there is no source code for B, and there is no object code for B with profiling codes in,
so you can't know the total time spent on B, but only the self time spent on B.

Thanks very much.
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