klibc/arch/x86_64/include/klibc/archsys.h

/*
 * arch/x86_64/include/klibc/archsys.h
 *
 * Architecture-specific syscall definitions
 */

#ifndef _KLIBC_ARCHSYS_H
#define _KLIBC_ARCHSYS_H

/* x86-64 seems to miss _syscall6() from its headers */

#ifndef _syscall6

#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
          type5,arg5,type6,arg6) \
type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,type6 arg6) \
{ \
long __res; \
register type4 __r10 asm("%r10") = arg4; \
register type5 __r8  asm("%r8")  = arg5; \
register type6 __r9  asm("%r9")  = arg6; \
__asm__ volatile (__syscall \
        : "=a" (__res) \
        : "0" (__NR_##name),"D" (arg1),"S" (arg2), \
          "d" (arg3),"r" (__r10),"r" (__r8), "r" (__r9) \
        : __syscall_clobber); \
__syscall_return(type,__res); \
}

#endif /* _syscall6 missing */

#endif /* _KLIBC_ARCHSYS_H */