[GCC 4.x][AMD64 ABI] variadic function
Hi to everyone, I cannot figure out how variadic function are practically implemented. In the called (variadic) function after few 'push's %rsp is suddenly decremented by N bytes: the red area starts 128 bytes below the NEW rsp or %rsp-N above? Is it possible to find the register save area and the overflowing arguments within the called function without using %ebp (that means with -fomit-frame-pointer set) and knowing nothing of the caller? The -so called- spill reg area is placed at fixed address? Thanx in advance, Matteo Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs
ABI64 and register save area
Hi, I that hope this is the right place for this kind of questions! However my question is rather simple: knowing the AMD64 ABI, is it possible to implement your own flavour of the va_xxx macros? If I compile _without_ -fomit-frame-pointer I'm able to retrieve the arguments pushed on the stack, but I'm not able to point correctly the register save area. Is this area placed at fixed position like the red zone? If not how I can find it (if possible)? Thanks for the time spent reading, Matteo Inviato da Yahoo! Mail. Tanti modi per restare in contatto con chi vuoi. http://it.docs.yahoo.com/mail/overview/index.html
