About linux : What-are-the-calling-conventions-for-UNIX-Linux-system-calls-and-user-space-functions-on-i386-and-x86-64

Following links explain x86-32 system call conventions for both UNIX (BSD flavor) & Linux:

• http://www.int80h.org/bsdasm/#system-calls

• http://www.freebsd.org/doc/en/books/developers-handbook/x86-system-calls.html

But what are the x86-64 system call conventions on both UNIX & Linux?