libgomp/config/linux/sparc/futex.h

   1 /* Copyright (C) 2005, 2008 Free Software Foundation, Inc.
   2    Contributed by Jakub Jelinek <jakub@redhat.com>.
   3
   4    This file is part of the GNU OpenMP Library (libgomp).
   5
   6    Libgomp is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU Lesser General Public License as published by
   8    the Free Software Foundation; either version 2.1 of the License, or
   9    (at your option) any later version.
  10
  11    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
  14    more details.
  15
  16    You should have received a copy of the GNU Lesser General Public License
  17    along with libgomp; see the file COPYING.LIB.  If not, write to the
  18    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with other files, some
  22    of which are compiled with GCC, to produce an executable, this library
  23    does not by itself cause the resulting executable to be covered by the
  24    GNU General Public License.  This exception does not however invalidate
  25    any other reasons why the executable file might be covered by the GNU
  26    General Public License.  */
  27
  28 /* Provide target-specific access to the futex system call.  */
  29
  30 #include <sys/syscall.h>
  31
  32 static inline long
  33 sys_futex0 (int *addr, int op, int val)
  34 {
  35   register long int g1  __asm__ ("g1");
  36   register long int o0  __asm__ ("o0");
  37   register long int o1  __asm__ ("o1");
  38   register long int o2  __asm__ ("o2");
  39   register long int o3  __asm__ ("o3");
  40
  41   g1 = SYS_futex;
  42   o0 = (long) addr;
  43   o1 = op;
  44   o2 = val;
  45   o3 = 0;
  46
  47 #ifdef __arch64__
  48 # define SYSCALL_STRING "ta\t0x6d; bcs,a,pt %%xcc, 1f; sub %%g0, %%o0, %%o0; 1:"
  49 #else
  50 # define SYSCALL_STRING "ta\t0x10; bcs,a 1f; sub %%g0, %%o0, %%o0; 1:"
  51 #endif
  52
  53   __asm volatile (SYSCALL_STRING
  54                   : "=r" (g1), "=r" (o0)
  55                   : "0" (g1), "1" (o0), "r" (o1), "r" (o2), "r" (o3)
  56                   : "g2", "g3", "g4", "g5", "g6",
  57                     "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
  58                     "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
  59                     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
  60                     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
  61 #ifdef __arch64__
  62                     "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46",
  63                     "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",
  64 #endif
  65                     "cc", "memory");
  66   return o0;
  67 }
  68
  69 static inline void
  70 futex_wait (int *addr, int val)
  71 {
  72   long err = sys_futex0 (addr, gomp_futex_wait, val);
  73   if (__builtin_expect (err == ENOSYS, 0))
  74     {
  75       gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
  76       gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
  77       sys_futex0 (addr, gomp_futex_wait, val);
  78     }
  79 }
  80
  81 static inline void
  82 futex_wake (int *addr, int count)
  83 {
  84   long err = sys_futex0 (addr, gomp_futex_wake, count);
  85   if (__builtin_expect (err == ENOSYS, 0))
  86     {
  87       gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
  88       gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
  89       sys_futex0 (addr, gomp_futex_wake, count);
  90     }
  91 }
  92
  93 static inline void
  94 cpu_relax (void)
  95 {
  96 #if defined __arch64__ || defined  __sparc_v9__
  97   __asm volatile ("membar #LoadLoad" : : : "memory");
  98 #else
  99   __asm volatile ("" : : : "memory");
 100 #endif
 101 }
 102
 103 static inline void
 104 atomic_write_barrier (void)
 105 {
 106 #if defined __arch64__ || defined __sparc_v9__
 107   __asm volatile ("membar #StoreStore" : : : "memory");
 108 #else
 109   __sync_synchronize ();
 110 #endif
 111 }