1/* Copyright (C) 2008-2017 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@redhat.com>.
3
4 This file is part of the GNU Transactional Memory Library (libitm).
5
6 Libitm is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 more details.
15
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
19
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
24
25#ifdef __x86_64__
26# ifndef SYS_futex
27# define SYS_futex 202
28# endif
29
30static inline long
31sys_futex0 (std::atomic<int> *addr, int op, int val)
32{
33 long res;
34
35 register long r10 __asm__("%r10") = 0;
36 __asm volatile ("syscall"
37 : "=a" (res)
38 : "0" (SYS_futex), "D" (addr), "S" (op),
39 "d" (val), "r" (r10)
40 : "r11", "rcx", "memory");
41
42 return res;
43}
44
45#else
46# ifndef SYS_futex
47# define SYS_futex 240
48# endif
49
50static inline long
51sys_futex0 (std::atomic<int> *addr, int op, int val)
52{
53 long res;
54
55 __asm volatile ("int $0x80"
56 : "=a" (res)
57 : "0"(SYS_futex), "b" (addr), "c"(op),
58 "d"(val), "S"(0)
59 : "memory");
60 return res;
61}
62
63#endif /* __x86_64__ */
64