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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
}
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