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_BSD_X86_VM_ATOMIC_BSD_X86_HPP
26 #define OS_CPU_BSD_X86_VM_ATOMIC_BSD_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 struct Atomic::PlatformAdd<2>: Atomic::AddShortUsingInt {};
66
67 inline void Atomic::inc (volatile jint* dest) {
68 __asm__ volatile ( "lock addl $1,(%0)" :
69 : "r" (dest) : "cc", "memory");
70 }
71
72 inline void Atomic::inc_ptr(volatile void* dest) {
73 inc_ptr((volatile intptr_t*)dest);
74 }
75
76 inline void Atomic::dec (volatile jint* dest) {
77 __asm__ volatile ( "lock subl $1,(%0)" :
78 : "r" (dest) : "cc", "memory");
79 }
80
81 inline void Atomic::dec_ptr(volatile void* dest) {
82 dec_ptr((volatile intptr_t*)dest);
83 }
84
85 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
86 __asm__ volatile ( "xchgl (%2),%0"
87 : "=r" (exchange_value)
88 : "0" (exchange_value), "r" (dest)
89 : "memory");
90 return exchange_value;
91 }
92
93 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
94 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
95 }
96
97 template<>
98 template<typename T>
99 inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value,
100 T volatile* dest,
101 T compare_value,
102 cmpxchg_memory_order /* order */) const {
103 STATIC_ASSERT(1 == sizeof(T));
104 __asm__ volatile ( "lock cmpxchgb %1,(%3)"
105 : "=a" (exchange_value)
106 : "q" (exchange_value), "a" (compare_value), "r" (dest)
107 : "cc", "memory");
108 return exchange_value;
109 }
110
111 template<>
112 template<typename T>
113 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
114 T volatile* dest,
115 T compare_value,
116 cmpxchg_memory_order /* order */) const {
117 STATIC_ASSERT(4 == sizeof(T));
118 __asm__ volatile ( "lock cmpxchgl %1,(%3)"
119 : "=a" (exchange_value)
120 : "r" (exchange_value), "a" (compare_value), "r" (dest)
121 : "cc", "memory");
122 return exchange_value;
123 }
124
125 #ifdef AMD64
126 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
127 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
128
129 template<>
130 template<typename I, typename D>
131 inline D Atomic::PlatformAdd<8>::fetch_and_add(I add_value, D volatile* dest) const {
132 STATIC_ASSERT(8 == sizeof(I));
133 STATIC_ASSERT(8 == sizeof(D));
134 D old_value;
135 __asm__ __volatile__ ( "lock xaddq %0,(%2)"
136 : "=r" (old_value)
137 : "0" (add_value), "r" (dest)
138 : "cc", "memory");
139 return old_value;
140 }
141
142 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
143 __asm__ __volatile__ ( "lock addq $1,(%0)"
144 :
145 : "r" (dest)
146 : "cc", "memory");
147 }
148
149 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
150 __asm__ __volatile__ ( "lock subq $1,(%0)"
151 :
152 : "r" (dest)
153 : "cc", "memory");
154 }
155
156 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
157 __asm__ __volatile__ ("xchgq (%2),%0"
158 : "=r" (exchange_value)
159 : "0" (exchange_value), "r" (dest)
160 : "memory");
161 return exchange_value;
162 }
163
164 template<>
165 template<typename T>
166 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
167 T volatile* dest,
168 T compare_value,
169 cmpxchg_memory_order /* order */) const {
170 STATIC_ASSERT(8 == sizeof(T));
171 __asm__ __volatile__ ( "lock cmpxchgq %1,(%3)"
172 : "=a" (exchange_value)
173 : "r" (exchange_value), "a" (compare_value), "r" (dest)
174 : "cc", "memory");
175 return exchange_value;
176 }
177
178 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
179
180 #else // !AMD64
181
182 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
183 inc((volatile jint*)dest);
184 }
185
186 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
187 dec((volatile jint*)dest);
188 }
189
190 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
191 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
192 }
193
194 extern "C" {
195 // defined in bsd_x86.s
196 jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
197 void _Atomic_move_long(const volatile jlong* src, volatile jlong* dst);
198 }
199
200 template<>
201 template<typename T>
202 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
203 T volatile* dest,
204 T compare_value,
205 cmpxchg_memory_order order) const {
206 STATIC_ASSERT(8 == sizeof(T));
207 return cmpxchg_using_helper<jlong>(_Atomic_cmpxchg_long, exchange_value, dest, compare_value);
208 }
209
210 inline jlong Atomic::load(const volatile jlong* src) {
211 volatile jlong dest;
212 _Atomic_move_long(src, &dest);
213 return dest;
214 }
215
216 inline void Atomic::store(jlong store_value, jlong* dest) {
217 _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
218 }
219
220 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
221 _Atomic_move_long((volatile jlong*)&store_value, dest);
222 }
223
224 #endif // AMD64
225
226 #endif // OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_HPP