How to get address of base stack pointer

Question

I am in the process of porting an application from x86 to x64. I am using Visual Studio 2009; most of the code is C++ and some portions are plain C. The __asm keyword is not

Answer 1

If you need the precise "base pointer" then inline assembly is the only way to go.

It is, surprisingly, possible to write code that munges the stack with relatively little platform-specific code, but it's hard to avoid assembly altogether (depending on what you're doing).

If all you're trying to do is avoid overflowing the stack, you can just take the address of any local variable.