1 /*
2 * Copyright (c) 1999, 2010, 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 "orderAccess_linux_x86.inline.hpp"
29 #include "runtime/atomic.hpp"
30 #include "runtime/os.hpp"
31 #include "vm_version_x86.hpp"
32
33 // Implementation of class atomic
34
35 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
36 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
37 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
38 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
39 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
40
41 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
42 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
43 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
44 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
45 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
46
47
48 // Adding a lock prefix to an instruction on MP machine
49 #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: "
50
51 inline jint Atomic::add (jint add_value, volatile jint* dest) {
52 jint addend = add_value;
53 int mp = os::is_MP();
54 __asm__ volatile ( LOCK_IF_MP(%3) "xaddl %0,(%2)"
55 : "=r" (addend)
56 : "0" (addend), "r" (dest), "r" (mp)
57 : "cc", "memory");
58 return addend + add_value;
59 }
60
61 inline void Atomic::inc (volatile jint* dest) {
62 int mp = os::is_MP();
63 __asm__ volatile (LOCK_IF_MP(%1) "addl $1,(%0)" :
64 : "r" (dest), "r" (mp) : "cc", "memory");
65 }
66
67 inline void Atomic::inc_ptr(volatile void* dest) {
68 inc_ptr((volatile intptr_t*)dest);
69 }
70
71 inline void Atomic::dec (volatile jint* dest) {
72 int mp = os::is_MP();
73 __asm__ volatile (LOCK_IF_MP(%1) "subl $1,(%0)" :
74 : "r" (dest), "r" (mp) : "cc", "memory");
75 }
76
77 inline void Atomic::dec_ptr(volatile void* dest) {
78 dec_ptr((volatile intptr_t*)dest);
79 }
80
81 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
82 __asm__ volatile ( "xchgl (%2),%0"
83 : "=r" (exchange_value)
84 : "0" (exchange_value), "r" (dest)
85 : "memory");
86 return exchange_value;
87 }
88
89 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
90 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
91 }
92
93
94 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
95 int mp = os::is_MP();
96 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"
97 : "=a" (exchange_value)
98 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
99 : "cc", "memory");
100 return exchange_value;
101 }
102
103 extern "C" {
104 // defined in linux_x86.s
105 jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
106 }
107
108 #ifdef AMD64
109 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
110 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
111
112 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
113 intptr_t addend = add_value;
114 bool mp = os::is_MP();
115 __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)"
116 : "=r" (addend)
117 : "0" (addend), "r" (dest), "r" (mp)
118 : "cc", "memory");
119 return addend + add_value;
120 }
121
122 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
123 return (void*)add_ptr(add_value, (volatile intptr_t*)dest);
124 }
125
126 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
127 bool mp = os::is_MP();
128 __asm__ __volatile__ (LOCK_IF_MP(%1) "addq $1,(%0)"
129 :
130 : "r" (dest), "r" (mp)
131 : "cc", "memory");
132 }
133
134 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
135 bool mp = os::is_MP();
136 __asm__ __volatile__ (LOCK_IF_MP(%1) "subq $1,(%0)"
137 :
138 : "r" (dest), "r" (mp)
139 : "cc", "memory");
140 }
141
142 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
143 __asm__ __volatile__ ("xchgq (%2),%0"
144 : "=r" (exchange_value)
145 : "0" (exchange_value), "r" (dest)
146 : "memory");
147 return exchange_value;
148 }
149
150 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
151 bool mp = os::is_MP();
152 __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)"
153 : "=a" (exchange_value)
154 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
155 : "cc", "memory");
156 return exchange_value;
157 }
158
159 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
160 return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
161 }
162
163 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
164 return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
165 }
166
167 #else
168 //inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
169 //inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
170
171 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
172 return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest);
173 }
174
175 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
176 return (void*)Atomic::add((jint)add_value, (volatile jint*)dest);
177 }
178
179
180 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
181 inc((volatile jint*)dest);
182 }
183
184 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
185 dec((volatile jint*)dest);
186 }
187
188 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
189 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
190 }
191
192 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
193 return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP());
194 }
195
196 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
197 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
198 }
199
200 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
201 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
202 }
203 #endif // AMD64
204
205 #endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_INLINE_HPP