1 /*
2 * Copyright (c) 1999, 2014, 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_INLINE_HPP
26 #define OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_INLINE_HPP
27
28 #include "runtime/atomic.hpp"
29 #include "runtime/os.hpp"
30
31 // Implementation of class atomic
32
33 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
34 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
35 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
36 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
37 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
38
39 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
40 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
41 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
42 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
43 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
44
45
46 // Adding a lock prefix to an instruction on MP machine
47 #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: "
48
49 inline jint Atomic::add (jint add_value, volatile jint* dest) {
50 jint addend = add_value;
51 int mp = os::is_MP();
52 __asm__ volatile ( LOCK_IF_MP(%3) "xaddl %0,(%2)"
53 : "=r" (addend)
54 : "0" (addend), "r" (dest), "r" (mp)
55 : "cc", "memory");
56 return addend + add_value;
57 }
58
59 inline void Atomic::inc (volatile jint* dest) {
60 int mp = os::is_MP();
61 __asm__ volatile (LOCK_IF_MP(%1) "addl $1,(%0)" :
62 : "r" (dest), "r" (mp) : "cc", "memory");
63 }
64
65 inline void Atomic::inc_ptr(volatile void* dest) {
66 inc_ptr((volatile intptr_t*)dest);
67 }
68
69 inline void Atomic::dec (volatile jint* dest) {
70 int mp = os::is_MP();
71 __asm__ volatile (LOCK_IF_MP(%1) "subl $1,(%0)" :
72 : "r" (dest), "r" (mp) : "cc", "memory");
73 }
74
75 inline void Atomic::dec_ptr(volatile void* dest) {
76 dec_ptr((volatile intptr_t*)dest);
77 }
78
79 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
80 __asm__ volatile ( "xchgl (%2),%0"
81 : "=r" (exchange_value)
82 : "0" (exchange_value), "r" (dest)
83 : "memory");
84 return exchange_value;
85 }
86
87 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
88 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
89 }
90
91 inline jbyte Atomic::cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
92 int mp = os::is_MP();
93 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgb %1,(%3)"
94 : "=a" (exchange_value)
95 : "q" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
96 : "cc", "memory");
97 return exchange_value;
98 }
99
100 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
101 int mp = os::is_MP();
102 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"
103 : "=a" (exchange_value)
104 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
105 : "cc", "memory");
106 return exchange_value;
107 }
108
109 #ifdef AMD64
110 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
111 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
112
113 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
114 intptr_t addend = add_value;
115 bool mp = os::is_MP();
116 __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)"
117 : "=r" (addend)
118 : "0" (addend), "r" (dest), "r" (mp)
119 : "cc", "memory");
120 return addend + add_value;
121 }
122
123 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
124 return (void*)add_ptr(add_value, (volatile intptr_t*)dest);
125 }
126
127 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
128 bool mp = os::is_MP();
129 __asm__ __volatile__ (LOCK_IF_MP(%1) "addq $1,(%0)"
130 :
131 : "r" (dest), "r" (mp)
132 : "cc", "memory");
133 }
134
135 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
136 bool mp = os::is_MP();
137 __asm__ __volatile__ (LOCK_IF_MP(%1) "subq $1,(%0)"
138 :
139 : "r" (dest), "r" (mp)
140 : "cc", "memory");
141 }
142
143 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
144 __asm__ __volatile__ ("xchgq (%2),%0"
145 : "=r" (exchange_value)
146 : "0" (exchange_value), "r" (dest)
147 : "memory");
148 return exchange_value;
149 }
150
151 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
152 bool mp = os::is_MP();
153 __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)"
154 : "=a" (exchange_value)
155 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
156 : "cc", "memory");
157 return exchange_value;
158 }
159
160 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
161 return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
162 }
163
164 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
165 return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
166 }
167
168 inline jlong Atomic::load(volatile jlong* src) { return *src; }
169
170 #else // !AMD64
171
172 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
173 return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest);
174 }
175
176 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
177 return (void*)Atomic::add((jint)add_value, (volatile jint*)dest);
178 }
179
180
181 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
182 inc((volatile jint*)dest);
183 }
184
185 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
186 dec((volatile jint*)dest);
187 }
188
189 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
190 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
191 }
192
193 extern "C" {
194 // defined in linux_x86.s
195 jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
196 void _Atomic_move_long(volatile jlong* src, volatile jlong* dst);
197 }
198
199 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
200 return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP());
201 }
202
203 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
204 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
205 }
206
207 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
208 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
209 }
210
211 inline jlong Atomic::load(volatile jlong* src) {
212 volatile jlong dest;
213 _Atomic_move_long(src, &dest);
214 return dest;
215 }
216
217 inline void Atomic::store(jlong store_value, jlong* dest) {
218 _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
219 }
220
221 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
222 _Atomic_move_long((volatile jlong*)&store_value, dest);
223 }
224
225 #endif // AMD64
226
227 #endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_INLINE_HPP