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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 | #ifdef __x86_64__ | |
26 | # ifndef SYS_futex | |
27 | # define SYS_futex 202 | |
28 | # endif | |
29 | ||
30 | static inline long | |
799142bf | 31 | sys_futex0 (std::atomic<int> *addr, long op, long val) |
0a35513e AH |
32 | { |
33 | register long r10 __asm__("%r10") = 0; | |
34 | long res; | |
35 | ||
36 | __asm volatile ("syscall" | |
37 | : "=a" (res) | |
38 | : "0" (SYS_futex), "D" (addr), "S" (op), "d" (val), "r" (r10) | |
39 | : "r11", "rcx", "memory"); | |
40 | ||
41 | return res; | |
42 | } | |
43 | ||
44 | #else | |
45 | # ifndef SYS_futex | |
46 | # define SYS_futex 240 | |
47 | # endif | |
48 | ||
49 | # ifdef __PIC__ | |
50 | ||
51 | static inline long | |
799142bf | 52 | sys_futex0 (std::atomic<int> *addr, int op, int val) |
0a35513e AH |
53 | { |
54 | long res; | |
55 | ||
56 | __asm volatile ("xchgl\t%%ebx, %2\n\t" | |
57 | "int\t$0x80\n\t" | |
58 | "xchgl\t%%ebx, %2" | |
59 | : "=a" (res) | |
60 | : "0"(SYS_futex), "r" (addr), "c"(op), | |
61 | "d"(val), "S"(0) | |
62 | : "memory"); | |
63 | return res; | |
64 | } | |
65 | ||
66 | # else | |
67 | ||
68 | static inline long | |
799142bf | 69 | sys_futex0 (std::atomic<int> *addr, int op, int val) |
0a35513e AH |
70 | { |
71 | long res; | |
72 | ||
73 | __asm volatile ("int $0x80" | |
74 | : "=a" (res) | |
75 | : "0"(SYS_futex), "b" (addr), "c"(op), | |
76 | "d"(val), "S"(0) | |
77 | : "memory"); | |
78 | return res; | |
79 | } | |
80 | ||
81 | # endif /* __PIC__ */ | |
82 | #endif /* __x86_64__ */ |