]>
Commit | Line | Data |
---|---|---|
750db234 | 1 | // Low-level functions for atomic operations: Sparc version -*- C++ -*- |
a29456b5 | 2 | |
a5544970 | 3 | // Copyright (C) 1999-2019 Free Software Foundation, Inc. |
a29456b5 BK |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
a29456b5 BK |
9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
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/>. | |
b2dad0e3 | 24 | |
2e362c74 | 25 | #include <ext/atomicity.h> |
b2dad0e3 | 26 | |
12ffa228 BK |
27 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
28 | { | |
29 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
3cbc7af0 | 30 | |
2c5d0ae8 BK |
31 | #ifdef __arch64__ |
32 | _Atomic_word | |
33 | __attribute__ ((__unused__)) | |
09f2a1e4 | 34 | __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () |
2c5d0ae8 BK |
35 | { |
36 | _Atomic_word __tmp1, __tmp2; | |
37 | _Atomic_word __val_extended = __val; | |
38 | ||
39 | __asm__ __volatile__("1: ldx [%3], %0\n\t" | |
40 | " add %0, %4, %1\n\t" | |
41 | " casx [%3], %0, %1\n\t" | |
42 | " sub %0, %1, %0\n\t" | |
43 | " brnz,pn %0, 1b\n\t" | |
44 | " nop" | |
45 | : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem) | |
46 | : "r" (__mem), "r" (__val_extended), "m" (*__mem)); | |
47 | return __tmp2; | |
48 | } | |
f92ab29f | 49 | |
2c5d0ae8 BK |
50 | void |
51 | __attribute__ ((__unused__)) | |
09f2a1e4 | 52 | __atomic_add(volatile _Atomic_word* __mem, int __val) throw () |
2c5d0ae8 BK |
53 | { |
54 | _Atomic_word __tmp1, __tmp2; | |
55 | _Atomic_word __val_extended = __val; | |
f92ab29f | 56 | |
2c5d0ae8 BK |
57 | __asm__ __volatile__("1: ldx [%3], %0\n\t" |
58 | " add %0, %4, %1\n\t" | |
59 | " casx [%3], %0, %1\n\t" | |
60 | " sub %0, %1, %0\n\t" | |
61 | " brnz,pn %0, 1b\n\t" | |
62 | " nop" | |
63 | : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem) | |
64 | : "r" (__mem), "r" (__val_extended), "m" (*__mem)); | |
65 | } | |
f92ab29f | 66 | |
750db234 JJ |
67 | #else /* __arch32__ */ |
68 | ||
2c5d0ae8 | 69 | template<int __inst> |
00d04db6 | 70 | struct _Atomicity_lock |
2c5d0ae8 BK |
71 | { |
72 | static unsigned char _S_atomicity_lock; | |
73 | }; | |
74 | ||
75 | template<int __inst> | |
00d04db6 | 76 | unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0; |
f92ab29f | 77 | |
00d04db6 | 78 | template unsigned char _Atomicity_lock<0>::_S_atomicity_lock; |
f92ab29f | 79 | |
2c5d0ae8 BK |
80 | _Atomic_word |
81 | __attribute__ ((__unused__)) | |
09f2a1e4 | 82 | __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () |
5ec3f566 | 83 | { |
2c5d0ae8 | 84 | _Atomic_word __result, __tmp; |
f92ab29f | 85 | |
2c5d0ae8 BK |
86 | __asm__ __volatile__("1: ldstub [%1], %0\n\t" |
87 | " cmp %0, 0\n\t" | |
88 | " bne 1b\n\t" | |
89 | " nop" | |
90 | : "=&r" (__tmp) | |
00d04db6 | 91 | : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) |
2c5d0ae8 BK |
92 | : "memory"); |
93 | __result = *__mem; | |
94 | *__mem += __val; | |
95 | __asm__ __volatile__("stb %%g0, [%0]" | |
96 | : /* no outputs */ | |
00d04db6 | 97 | : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) |
2c5d0ae8 BK |
98 | : "memory"); |
99 | return __result; | |
100 | } | |
f92ab29f | 101 | |
2c5d0ae8 BK |
102 | void |
103 | __attribute__ ((__unused__)) | |
09f2a1e4 | 104 | __atomic_add(volatile _Atomic_word* __mem, int __val) throw () |
2c5d0ae8 BK |
105 | { |
106 | _Atomic_word __tmp; | |
f92ab29f | 107 | |
2c5d0ae8 BK |
108 | __asm__ __volatile__("1: ldstub [%1], %0\n\t" |
109 | " cmp %0, 0\n\t" | |
110 | " bne 1b\n\t" | |
111 | " nop" | |
112 | : "=&r" (__tmp) | |
00d04db6 | 113 | : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) |
2c5d0ae8 BK |
114 | : "memory"); |
115 | *__mem += __val; | |
116 | __asm__ __volatile__("stb %%g0, [%0]" | |
117 | : /* no outputs */ | |
00d04db6 | 118 | : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) |
2c5d0ae8 | 119 | : "memory"); |
f92ab29f | 120 | } |
750db234 | 121 | #endif /* __arch32__ */ |
3cbc7af0 | 122 | |
12ffa228 BK |
123 | _GLIBCXX_END_NAMESPACE_VERSION |
124 | } // namespace |