glibc/sysdeps/unix/x86_64/sysdep.h

/* Copyright (C) 1991, 92, 93, 95, 96, 97, 2000, 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <sysdeps/unix/sysdep.h>
#include <sysdeps/x86_64/sysdep.h>

#ifdef	__ASSEMBLER__

/* This is defined as a separate macro so that other sysdep.h files
   can include this one and then redefine DO_CALL.  */

#define DO_CALL(syscall_name, args)					      \
  lea SYS_ify (syscall_name), %rax;					      \
  syscall

#define	r0		%rax	/* Normal return-value register.  */
#define	r1		%rbx	/* Secondary return-value register.  */
#define MOVE(x,y)	movq x, y

#endif	/* __ASSEMBLER__ */