text: /* Copyright (C) 2011-2017 Free Software Foundation, Inc.
     Contributed by Walter Lee (walt@tilera.com)
  
     This file is part of the GNU Offloading and Multi Processing 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>
  #include <linux/futex.h>
  
  static inline void
  sys_futex0 (int *addr, int op, int val)
  {
    long _sys_result;
    long _clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10;
    int err;
  
    __asm__ __volatile__ (
      "swint1"
      : "=R00" (_sys_result), "=R01" (err), "=R02" (_clobber_r2),
        "=R03" (_clobber_r3), "=R04" (_clobber_r4), "=R05" (_clobber_r5),
        "=R10" (_clobber_r10)
      : "R10" (SYS_futex), "R00" (addr), "R01" (op), "R02" (val),
        "R03" (0)
      :  "r6",  "r7",
         "r8",  "r9",        "r11", "r12", "r13", "r14", "r15",
        "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
        "r24", "r25", "r26", "r27", "r28", "r29", "memory");
  }
  
  static inline void
  futex_wait (int *addr, int val)
  {
    sys_futex0 (addr, FUTEX_WAIT, val);
  }
  
  static inline void
  futex_wake (int *addr, int count)
  {
    sys_futex0 (addr, FUTEX_WAKE, count);
  }
  
  static inline void
  cpu_relax (void)
  {
    __asm volatile ("" : : : "memory");
  }
  
  static inline void
  atomic_write_barrier (void)
  {
    __sync_synchronize ();
  }
  