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jeremybenn |
/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
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Contributed by Jakub Jelinek <jakub@redhat.com>.
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This file is part of the GNU OpenMP Library (libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Provide target-specific access to the futex system call. */
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#include <sys/syscall.h>
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static inline long
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sys_futex0 (int *addr, int op, int val)
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{
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register long int g1 __asm__ ("g1");
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register long int o0 __asm__ ("o0");
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register long int o1 __asm__ ("o1");
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register long int o2 __asm__ ("o2");
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register long int o3 __asm__ ("o3");
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g1 = SYS_futex;
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o0 = (long) addr;
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o1 = op;
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o2 = val;
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o3 = 0;
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#ifdef __arch64__
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# define SYSCALL_STRING "ta\t0x6d; bcs,a,pt %%xcc, 1f; sub %%g0, %%o0, %%o0; 1:"
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#else
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# define SYSCALL_STRING "ta\t0x10; bcs,a 1f; sub %%g0, %%o0, %%o0; 1:"
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#endif
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__asm volatile (SYSCALL_STRING
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: "=r" (g1), "=r" (o0)
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: "0" (g1), "1" (o0), "r" (o1), "r" (o2), "r" (o3)
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: "g2", "g3", "g4", "g5", "g6",
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
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"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
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"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
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"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
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#ifdef __arch64__
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"f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46",
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"f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",
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#endif
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"cc", "memory");
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return o0;
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}
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static inline void
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futex_wait (int *addr, int val)
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{
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long err = sys_futex0 (addr, gomp_futex_wait, val);
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if (__builtin_expect (err == ENOSYS, 0))
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{
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gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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sys_futex0 (addr, gomp_futex_wait, val);
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}
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}
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static inline void
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futex_wake (int *addr, int count)
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{
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long err = sys_futex0 (addr, gomp_futex_wake, count);
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if (__builtin_expect (err == ENOSYS, 0))
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{
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gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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sys_futex0 (addr, gomp_futex_wake, count);
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}
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}
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static inline void
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cpu_relax (void)
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{
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#if defined __arch64__ || defined __sparc_v9__
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__asm volatile ("membar #LoadLoad" : : : "memory");
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#else
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__asm volatile ("" : : : "memory");
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#endif
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}
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