How is the C++ exception handling runtime implemented?

Question

I am intrigued by how the C++ exception handling mechanism works. Specifically, where is the exception object stored and how does it propagate through several scopes until i

Answer 1

I know this is an old question, but there's a very good exposition, explaining both the methods used in each of gcc and VC here: http://www.hexblog.com/wp-content/uploads/2012/06/Recon-2012-Skochinsky-Compiler-Internals.pdf