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94540c6b | 1 | // Low-level functions for atomic operations: PA-RISC version -*- C++ -*- |
95168ca5 | 2 | |
fbd26352 | 3 | // Copyright (C) 2002-2019 Free Software Foundation, Inc. |
94540c6b | 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 | |
6bc9506f | 8 | // Free Software Foundation; either version 3, or (at your option) |
94540c6b | 9 | // any later version. |
95168ca5 | 10 | |
94540c6b | 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. | |
95168ca5 | 15 | |
6bc9506f | 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/>. | |
95168ca5 | 24 | |
d9323516 | 25 | #include <bits/c++config.h> |
72de368c | 26 | #include <ext/atomicity.h> |
95168ca5 | 27 | |
2948dd21 | 28 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
29 | { | |
30 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
1069247d | 31 | |
d9323516 | 32 | template<int _Inst> |
33 | struct _Atomicity_lock | |
94540c6b | 34 | { |
35 | static volatile int _S_atomicity_lock; | |
36 | }; | |
33b7ef52 | 37 | |
d9323516 | 38 | template<int _Inst> |
94540c6b | 39 | volatile int |
d9323516 | 40 | _Atomicity_lock<_Inst>::_S_atomicity_lock __attribute__ ((aligned (16))) = 1; |
95168ca5 | 41 | |
d9323516 | 42 | // Because of the lack of weak support when using the hpux som |
a7f96d1c | 43 | // linker, we explicitly instantiate the atomicity lock. |
d9323516 | 44 | template volatile int _Atomicity_lock<0>::_S_atomicity_lock; |
95168ca5 | 45 | |
94540c6b | 46 | int |
47 | __attribute__ ((__unused__)) | |
e49af22b | 48 | __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () |
94540c6b | 49 | { |
50 | _Atomic_word result; | |
51 | int tmp; | |
d9323516 | 52 | volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock; |
33b7ef52 | 53 | |
94540c6b | 54 | __asm__ __volatile__ ("ldcw 0(%1),%0\n\t" |
55 | "cmpib,<>,n 0,%0,.+20\n\t" | |
56 | "ldw 0(%1),%0\n\t" | |
57 | "cmpib,= 0,%0,.-4\n\t" | |
58 | "nop\n\t" | |
59 | "b,n .-20" | |
60 | : "=&r" (tmp) | |
8b68033e | 61 | : "r" (&lock) |
62 | : "memory"); | |
33b7ef52 | 63 | |
94540c6b | 64 | result = *__mem; |
65 | *__mem = result + __val; | |
4cc1b222 | 66 | __asm__ __volatile__ ("stw %1,0(%0)" |
94540c6b | 67 | : : "r" (&lock), "r" (tmp) : "memory"); |
68 | return result; | |
69 | } | |
33b7ef52 | 70 | |
94540c6b | 71 | void |
72 | __attribute__ ((__unused__)) | |
e49af22b | 73 | __atomic_add(volatile _Atomic_word* __mem, int __val) throw () |
94540c6b | 74 | { |
75 | int tmp; | |
d9323516 | 76 | volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock; |
33b7ef52 | 77 | |
94540c6b | 78 | __asm__ __volatile__ ("ldcw 0(%1),%0\n\t" |
79 | "cmpib,<>,n 0,%0,.+20\n\t" | |
80 | "ldw 0(%1),%0\n\t" | |
81 | "cmpib,= 0,%0,.-4\n\t" | |
82 | "nop\n\t" | |
83 | "b,n .-20" | |
84 | : "=&r" (tmp) | |
8b68033e | 85 | : "r" (&lock) |
86 | : "memory"); | |
33b7ef52 | 87 | |
94540c6b | 88 | *__mem += __val; |
4cc1b222 | 89 | __asm__ __volatile__ ("stw %1,0(%0)" |
94540c6b | 90 | : : "r" (&lock), "r" (tmp) : "memory"); |
91 | } | |
1069247d | 92 | |
2948dd21 | 93 | _GLIBCXX_END_NAMESPACE_VERSION |
94 | } // namespace |