[GCC 4.x][AMD64 ABI] variadic function

[Matteo Emanuele]

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


		
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