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1 | /* Copyright (C) 2008, 2009, 2011 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 | /* Provide target-specific access to the futex system call. */ | |
26 | ||
27 | #ifndef SYS_futex | |
28 | #define SYS_futex 394 | |
29 | #endif | |
30 | ||
31 | static inline long | |
799142bf | 32 | sys_futex0 (std::atomic<int> *addr, long op, long val) |
0a35513e AH |
33 | { |
34 | register long sc_0 __asm__("$0"); | |
35 | register long sc_16 __asm__("$16"); | |
36 | register long sc_17 __asm__("$17"); | |
37 | register long sc_18 __asm__("$18"); | |
38 | register long sc_19 __asm__("$19"); | |
39 | long res; | |
40 | ||
41 | sc_0 = SYS_futex; | |
42 | sc_16 = (long) addr; | |
43 | sc_17 = op; | |
44 | sc_18 = val; | |
45 | sc_19 = 0; | |
46 | __asm volatile ("callsys" | |
47 | : "=r" (sc_0), "=r"(sc_19) | |
48 | : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19) | |
49 | : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", | |
50 | "$22", "$23", "$24", "$25", "$27", "$28", "memory"); | |
51 | ||
52 | res = sc_0; | |
53 | if (__builtin_expect (sc_19, 0)) | |
54 | res = -res; | |
55 | return res; | |
56 | } |