/* Copyright (C) 2015-2018 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 <bits/wordsize.h>

#include <kernel-features.h>

/* Set error number and return -1.  A target may choose to return the

   internal function, __syscall_error, which sets errno and returns -1.

   We use -1l, instead of -1, so that it can be casted to (void *).  */

#define INLINE_SYSCALL_ERROR_RETURN_VALUE(err)  \

  ({						\

    __set_errno (err);				\

    -1l;					\

  })

/* Provide a dummy argument that can be used to force register

   alignment for register pairs if required by the syscall ABI.  */

#ifdef __ASSUME_ALIGNED_REGISTER_PAIRS

#define __ALIGNMENT_ARG 0,

#define __ALIGNMENT_COUNT(a,b) b

#else

#define __ALIGNMENT_ARG

#define __ALIGNMENT_COUNT(a,b) a

#endif

/* Provide a common macro to pass 64-bit value on syscalls.  */

#if __WORDSIZE == 64 || defined __ASSUME_WORDSIZE64_ILP32

# define SYSCALL_LL(val)   (val)

# define SYSCALL_LL64(val) (val)

#else

#define SYSCALL_LL(val)   \

  __LONG_LONG_PAIR ((val) >> 31, (val))

#define SYSCALL_LL64(val) \

  __LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff))

#endif

/* Provide a common macro to pass 64-bit value on pread and pwrite

   syscalls.  */

#ifdef __ASSUME_PRW_DUMMY_ARG

# define SYSCALL_LL_PRW(val)   0, SYSCALL_LL (val)

# define SYSCALL_LL64_PRW(val) 0, SYSCALL_LL64 (val)

#else

# define SYSCALL_LL_PRW(val)   __ALIGNMENT_ARG SYSCALL_LL (val)

# define SYSCALL_LL64_PRW(val) __ALIGNMENT_ARG SYSCALL_LL64 (val)

#endif

/* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}.  */

#define LO_HI_LONG(val) \

 (long) (val), \

 (long) (((uint64_t) (val)) >> 32)

/* Exports the __send symbol on send.c linux implementation (some ABI have

   it missing due the usage of a old generic version without it).  */

#define HAVE_INTERNAL_SEND_SYMBOL	1