>>70
You're right in that C does not specify that parameters go on a stack. But that's where it ends. In common C ABI specifications, register-based parameter passing conventions (like with amd64, powerpc and sparc) behave exactly the same way, i.e. the caller manages the parameter stack.

And for most people, the ABI is a part of the target they are programming for. Thus practically inseparable from C the language.