79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
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/* Copyright (C) 2005-2021 Free Software Foundation, Inc.
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Contributed by Ilie Garbacea <ilie@mips.com>, Chao-ying Fu <fu@mips.com>.
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This file is part of the GNU Offloading and Multi Processing Library
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(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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#if !defined (SYS_futex)
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#define SYS_futex __NR_futex
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#endif
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#ifdef __mips16
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static void __attribute__((noinline,nomips16))
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#else
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static inline void
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#endif
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sys_futex0 (int *addr, int op, int val)
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{
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register unsigned long __v0 asm("$2");
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register unsigned long __a0 asm("$4") = (unsigned long) addr;
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register unsigned long __a1 asm("$5") = (unsigned long) op;
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register unsigned long __a2 asm("$6") = (unsigned long) val;
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register unsigned long __a3 asm("$7") = 0;
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__asm volatile ("li $2, %6\n\t"
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"syscall"
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/* returns $a3 (errno), $v0 (return value) */
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: "=r" (__v0), "=r" (__a3)
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/* arguments in a0-a3, and syscall number */
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: "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a3),
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"IK" (SYS_futex)
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/* clobbers at, v1, t0-t9, memory */
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14",
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"$15", "$24", "$25", "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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