I was also trying to be Intel/AMD ISA independent. The Intel is SYSENTER, the AMD is SYSCALL. He's right though, I probably would have used SYSENTER in producti

I was also trying to be Intel/AMD ISA independent. The Intel is SYSENTER, the AMD is SYSCALL. He's right though, I probably would have used SYSENTER in production code. You probably want to use int $0x80 in shellcode, though (fewer save registers).