1 /*
2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP
26 #define OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP
27
28 // Implementation of class atomic
29
30 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
31 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
32 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
33 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
34 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
35
36 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
37 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
38 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
39 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
40 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
41
42
43 template<size_t byte_size>
44 struct Atomic::PlatformAdd
45 : Atomic::FetchAndAdd<Atomic::PlatformAdd<byte_size> >
46 {
47 template<typename I, typename D>
48 D fetch_and_add(I add_value, D volatile* dest) const;
49 };
50
51 template<>
52 template<typename I, typename D>
53 inline D Atomic::PlatformAdd<4>::fetch_and_add(I add_value, D volatile* dest) const {
54 STATIC_ASSERT(4 == sizeof(I));
55 STATIC_ASSERT(4 == sizeof(D));
56 D old_value;
57 __asm__ volatile ( "lock xaddl %0,(%2)"
58 : "=r" (old_value)
59 : "0" (add_value), "r" (dest)
60 : "cc", "memory");
61 return old_value;
62 }
63
64 template<>
65 template<typename T>
66 inline T Atomic::PlatformXchg<4>::operator()(T exchange_value,
67 T volatile* dest) const {
68 STATIC_ASSERT(4 == sizeof(T));
69 __asm__ volatile ( "xchgl (%2),%0"
70 : "=r" (exchange_value)
71 : "0" (exchange_value), "r" (dest)
72 : "memory");
73 return exchange_value;
74 }
75
76 template<>
77 template<typename T>
78 inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value,
79 T volatile* dest,
80 T compare_value,
81 cmpxchg_memory_order /* order */) const {
82 STATIC_ASSERT(1 == sizeof(T));
83 __asm__ volatile ("lock cmpxchgb %1,(%3)"
84 : "=a" (exchange_value)
85 : "q" (exchange_value), "a" (compare_value), "r" (dest)
86 : "cc", "memory");
87 return exchange_value;
88 }
89
90 template<>
91 template<typename T>
92 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
93 T volatile* dest,
94 T compare_value,
95 cmpxchg_memory_order /* order */) const {
96 STATIC_ASSERT(4 == sizeof(T));
97 __asm__ volatile ("lock cmpxchgl %1,(%3)"
98 : "=a" (exchange_value)
99 : "r" (exchange_value), "a" (compare_value), "r" (dest)
100 : "cc", "memory");
101 return exchange_value;
102 }
103
104 #ifdef AMD64
105 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
106 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
107
108 template<>
109 template<typename I, typename D>
110 inline D Atomic::PlatformAdd<8>::fetch_and_add(I add_value, D volatile* dest) const {
111 STATIC_ASSERT(8 == sizeof(I));
112 STATIC_ASSERT(8 == sizeof(D));
113 D old_value;
114 __asm__ __volatile__ ("lock xaddq %0,(%2)"
115 : "=r" (old_value)
116 : "0" (add_value), "r" (dest)
117 : "cc", "memory");
118 return old_value;
119 }
120
121 template<>
122 template<typename T>
123 inline T Atomic::PlatformXchg<8>::operator()(T exchange_value,
124 T volatile* dest) const {
125 STATIC_ASSERT(8 == sizeof(T));
126 __asm__ __volatile__ ("xchgq (%2),%0"
127 : "=r" (exchange_value)
128 : "0" (exchange_value), "r" (dest)
129 : "memory");
130 return exchange_value;
131 }
132
133 template<>
134 template<typename T>
135 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
136 T volatile* dest,
137 T compare_value,
138 cmpxchg_memory_order /* order */) const {
139 STATIC_ASSERT(8 == sizeof(T));
140 __asm__ __volatile__ ("lock cmpxchgq %1,(%3)"
141 : "=a" (exchange_value)
142 : "r" (exchange_value), "a" (compare_value), "r" (dest)
143 : "cc", "memory");
144 return exchange_value;
145 }
146
147 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
148
149 #else // !AMD64
150
151 extern "C" {
152 // defined in linux_x86.s
153 jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong);
154 void _Atomic_move_long(const volatile jlong* src, volatile jlong* dst);
155 }
156
157 template<>
158 template<typename T>
159 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
160 T volatile* dest,
161 T compare_value,
162 cmpxchg_memory_order order) const {
163 STATIC_ASSERT(8 == sizeof(T));
164 return cmpxchg_using_helper<jlong>(_Atomic_cmpxchg_long, exchange_value, dest, compare_value);
165 }
166
167 inline jlong Atomic::load(const volatile jlong* src) {
168 volatile jlong dest;
169 _Atomic_move_long(src, &dest);
170 return dest;
171 }
172
173 inline void Atomic::store(jlong store_value, jlong* dest) {
174 _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
175 }
176
177 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
178 _Atomic_move_long((volatile jlong*)&store_value, dest);
179 }
180
181 #endif // AMD64
182
183 #endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP