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/* Copyright (C) 2005-2022 Free Software Foundation, Inc.
Contributed by Ilie Garbacea <ilie@mips.com>, Chao-ying Fu <fu@mips.com>.
This file is part of the GNU Offloading and Multi Processing 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");
}
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