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/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.

   Contributed by Jakub Jelinek <jakub@redhat.com>.

   This file is part of the GNU OpenMP Library (libgomp).

   Libgomp is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   Libgomp 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 General Public License for

   more details.

   Under Section 7 of GPL version 3, you are granted additional

   permissions described in the GCC Runtime Library Exception, version

   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and

   a copy of the GCC Runtime Library Exception along with this program;

   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

   <http://www.gnu.org/licenses/>.  */

/* Provide target-specific access to the futex system call.  */

#include <sys/syscall.h>

static inline long

sys_futex0 (int *addr, int op, int val)

{

  register long int g1  __asm__ ("g1");

  register long int o0  __asm__ ("o0");

  register long int o1  __asm__ ("o1");

  register long int o2  __asm__ ("o2");

  register long int o3  __asm__ ("o3");

  g1 = SYS_futex;

  o0 = (long) addr;

  o1 = op;

  o2 = val;

  o3 = 0;

#ifdef __arch64__

# define SYSCALL_STRING "ta\t0x6d; bcs,a,pt %%xcc, 1f; sub %%g0, %%o0, %%o0; 1:"

#else

# define SYSCALL_STRING "ta\t0x10; bcs,a 1f; sub %%g0, %%o0, %%o0; 1:"

#endif

  __asm volatile (SYSCALL_STRING

                  : "=r" (g1), "=r" (o0)

                  : "0" (g1), "1" (o0), "r" (o1), "r" (o2), "r" (o3)

                  : "g2", "g3", "g4", "g5", "g6",

                    "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",

                    "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",

                    "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",

                    "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",

#ifdef __arch64__

                    "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46",

                    "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",

#endif

                    "cc", "memory");

  return o0;

}

static inline void

futex_wait (int *addr, int val)

{

  long err = sys_futex0 (addr, gomp_futex_wait, val);

  if (__builtin_expect (err == ENOSYS, 0))

    {

      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;

      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;

      sys_futex0 (addr, gomp_futex_wait, val);

    }

}

static inline void

futex_wake (int *addr, int count)

{

  long err = sys_futex0 (addr, gomp_futex_wake, count);

  if (__builtin_expect (err == ENOSYS, 0))

    {

      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;

      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;

      sys_futex0 (addr, gomp_futex_wake, count);

    }

}

static inline void

cpu_relax (void)

{

#if defined __arch64__ || defined  __sparc_v9__

  __asm volatile ("membar #LoadLoad" : : : "memory");

#else

  __asm volatile ("" : : : "memory");

#endif

}

static inline void

atomic_write_barrier (void)

{

#if defined __arch64__ || defined __sparc_v9__

  __asm volatile ("membar #StoreStore" : : : "memory");

#else

  __sync_synchronize ();

#endif

}