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jeremybenn |
/* Copyright (C) 2011, 2012
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Free Software Foundation, Inc.
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Contributed by Walter Lee (walt@tilera.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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#include <linux/futex.h>
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static inline void
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sys_futex0 (int *addr, int op, int val)
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{
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long _sys_result;
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long _clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10;
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int err;
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__asm__ __volatile__ (
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"swint1"
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: "=R00" (_sys_result), "=R01" (err), "=R02" (_clobber_r2),
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"=R03" (_clobber_r3), "=R04" (_clobber_r4), "=R05" (_clobber_r5),
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"=R10" (_clobber_r10)
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: "R10" (SYS_futex), "R00" (addr), "R01" (op), "R02" (val),
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"R03" (0)
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: "r6", "r7",
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"r8", "r9", "r11", "r12", "r13", "r14", "r15",
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"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
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"r24", "r25", "r26", "r27", "r28", "r29", "memory");
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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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sys_futex0 (addr, FUTEX_WAIT, val);
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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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sys_futex0 (addr, FUTEX_WAKE, count);
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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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__asm volatile ("" : : : "memory");
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}
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static inline void
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atomic_write_barrier (void)
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{
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__sync_synchronize ();
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}
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