78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* Copyright (C) 2005-2015 Free Software Foundation, Inc.
|
|
Contributed by Ilie Garbacea <ilie@mips.com>, Chao-ying Fu <fu@mips.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>
|
|
|
|
#if !defined (SYS_futex)
|
|
#define SYS_futex __NR_futex
|
|
#endif
|
|
|
|
#define FUTEX_WAIT 0
|
|
#define FUTEX_WAKE 1
|
|
|
|
#ifdef __mips16
|
|
static void __attribute__((noinline,nomips16))
|
|
#else
|
|
static inline void
|
|
#endif
|
|
sys_futex0 (int *addr, int op, int val)
|
|
{
|
|
register unsigned long __v0 asm("$2");
|
|
register unsigned long __a0 asm("$4") = (unsigned long) addr;
|
|
register unsigned long __a1 asm("$5") = (unsigned long) op;
|
|
register unsigned long __a2 asm("$6") = (unsigned long) val;
|
|
register unsigned long __a3 asm("$7") = 0;
|
|
|
|
__asm volatile ("li $2, %6\n\t"
|
|
"syscall"
|
|
/* returns $a3 (errno), $v0 (return value) */
|
|
: "=r" (__v0), "=r" (__a3)
|
|
/* arguments in a0-a3, and syscall number */
|
|
: "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a3),
|
|
"IK" (SYS_futex)
|
|
/* clobbers at, v1, t0-t9, memory */
|
|
: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14",
|
|
"$15", "$24", "$25", "memory");
|
|
}
|
|
|
|
static inline void
|
|
futex_wait (int *addr, int val)
|
|
{
|
|
sys_futex0 (addr, FUTEX_WAIT, val);
|
|
}
|
|
|
|
static inline void
|
|
futex_wake (int *addr, int count)
|
|
{
|
|
sys_futex0 (addr, FUTEX_WAKE, count);
|
|
}
|
|
|
|
static inline void
|
|
cpu_relax (void)
|
|
{
|
|
__asm volatile ("" : : : "memory");
|
|
}
|