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/* Copyright (C) 2008-2018 Free Software Foundation, Inc.
Contributed by Richard Henderson <>.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm 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 of the License, or
(at your option) any later version.
Libitm 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
<>. */
/* Provide target-specific access to the futex system call. */
#ifndef SYS_futex
#define SYS_futex 394
static inline long
sys_futex0 (std::atomic<int> *addr, int op, int val)
register long sc_0 __asm__("$0");
register long sc_16 __asm__("$16");
register long sc_17 __asm__("$17");
register long sc_18 __asm__("$18");
register long sc_19 __asm__("$19");
long res;
sc_0 = SYS_futex;
sc_16 = (long) addr;
sc_17 = op;
sc_18 = val;
sc_19 = 0;
__asm volatile ("callsys"
: "=r" (sc_0), "=r"(sc_19)
: "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19)
: "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
"$22", "$23", "$24", "$25", "$27", "$28", "memory");
res = sc_0;
if (__builtin_expect (sc_19, 0))
res = -res;
return res;