Stefan Dösinger writes: >On a partly related topic, I think the Win64 ABI requires that the first >function is two bytes long, and there at least 6 bytes of slack before >the function. Does gcc implement that?
As far as I can tell the Win64 ABI doesn't have either of these requirements. Microsoft's compiler certainly doesn't guarantee that functions begin with two byte instructions, and the "x64 Software Conventions" document gives examples of prologues with larger initial instructions: http://msdn.microsoft.com/en-us/library/tawsa7cb(VS.80).aspx Mind you, last I checked, GCC didn't actually follow the ABI requirements for prologues and epilogues given in the link above, but that only breaks ABI unwinding. Ross Ridge