1 /*
2 * Copyright (c) 2003, 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_ORDERACCESS_LINUX_X86_INLINE_HPP
26 #define OS_CPU_LINUX_X86_VM_ORDERACCESS_LINUX_X86_INLINE_HPP
27
28 #include "runtime/atomic.inline.hpp"
29 #include "runtime/orderAccess.hpp"
30 #include "runtime/os.hpp"
31
32 // Implementation of class OrderAccess.
33
34 // A compiler barrier, forcing the C++ compiler to invalidate all memory assumptions
35 static inline void compiler_barrier() {
36 __asm__ volatile ("" : : : "memory");
37 }
38
39 inline void OrderAccess::loadload() { acquire(); }
40 inline void OrderAccess::storestore() { release(); }
41 inline void OrderAccess::loadstore() { acquire(); }
42 inline void OrderAccess::storeload() { fence(); }
43
44 inline void OrderAccess::acquire() {
45 volatile intptr_t local_dummy;
46 #ifdef AMD64
47 __asm__ volatile ("movq 0(%%rsp), %0" : "=r" (local_dummy) : : "memory");
48 #else
49 __asm__ volatile ("movl 0(%%esp),%0" : "=r" (local_dummy) : : "memory");
50 #endif // AMD64
51 }
52
53 inline void OrderAccess::release() {
54 compiler_barrier();
55 }
56
57 inline void OrderAccess::fence() {
58 if (os::is_MP()) {
59 // always use locked addl since mfence is sometimes expensive
60 #ifdef AMD64
61 __asm__ volatile ("lock; addl $0,0(%%rsp)" : : : "cc", "memory");
62 #else
63 __asm__ volatile ("lock; addl $0,0(%%esp)" : : : "cc", "memory");
64 #endif
65 }
66 }
67
68 inline jbyte OrderAccess::load_acquire(volatile jbyte* p) { jbyte v = *p; compiler_barrier(); return v; }
69 inline jshort OrderAccess::load_acquire(volatile jshort* p) { jshort v = *p; compiler_barrier(); return v; }
70 inline jint OrderAccess::load_acquire(volatile jint* p) { jint v = *p; compiler_barrier(); return v; }
71 inline jlong OrderAccess::load_acquire(volatile jlong* p) { jlong v = Atomic::load(p); compiler_barrier(); return v; }
72 inline jubyte OrderAccess::load_acquire(volatile jubyte* p) { jubyte v = *p; compiler_barrier(); return v; }
73 inline jushort OrderAccess::load_acquire(volatile jushort* p) { jushort v = *p; compiler_barrier(); return v; }
74 inline juint OrderAccess::load_acquire(volatile juint* p) { juint v = *p; compiler_barrier(); return v; }
75 inline julong OrderAccess::load_acquire(volatile julong* p) { julong v = Atomic::load((volatile jlong*)p); compiler_barrier(); return v; }
76 inline jfloat OrderAccess::load_acquire(volatile jfloat* p) { jfloat v = *p; compiler_barrier(); return v; }
77 inline jdouble OrderAccess::load_acquire(volatile jdouble* p) { jdouble v = jdouble_cast(Atomic::load((volatile jlong*)p)); compiler_barrier(); return v; }
78
79 inline intptr_t OrderAccess::load_ptr_acquire(volatile intptr_t* p) { intptr_t v = *p; compiler_barrier(); return v; }
80 inline void* OrderAccess::load_ptr_acquire(volatile void* p) { void* v = *(void* volatile *)p; compiler_barrier(); return v; }
81 inline void* OrderAccess::load_ptr_acquire(const volatile void* p) { void* v = *(void* const volatile *)p; compiler_barrier(); return v; }
82
83 inline void OrderAccess::release_store(volatile jbyte* p, jbyte v) { compiler_barrier(); *p = v; }
84 inline void OrderAccess::release_store(volatile jshort* p, jshort v) { compiler_barrier(); *p = v; }
85 inline void OrderAccess::release_store(volatile jint* p, jint v) { compiler_barrier(); *p = v; }
86 inline void OrderAccess::release_store(volatile jlong* p, jlong v) { compiler_barrier(); Atomic::store(v, p); }
87 inline void OrderAccess::release_store(volatile jubyte* p, jubyte v) { compiler_barrier(); *p = v; }
88 inline void OrderAccess::release_store(volatile jushort* p, jushort v) { compiler_barrier(); *p = v; }
89 inline void OrderAccess::release_store(volatile juint* p, juint v) { compiler_barrier(); *p = v; }
90 inline void OrderAccess::release_store(volatile julong* p, julong v) { compiler_barrier(); Atomic::store((jlong)v, (volatile jlong*)p); }
91 inline void OrderAccess::release_store(volatile jfloat* p, jfloat v) { compiler_barrier(); *p = v; }
92 inline void OrderAccess::release_store(volatile jdouble* p, jdouble v) { release_store((volatile jlong *)p, jlong_cast(v)); }
93
94 inline void OrderAccess::release_store_ptr(volatile intptr_t* p, intptr_t v) { compiler_barrier(); *p = v; }
95 inline void OrderAccess::release_store_ptr(volatile void* p, void* v) { compiler_barrier(); *(void* volatile *)p = v; }
96
97 inline void OrderAccess::store_fence(jbyte* p, jbyte v) {
98 __asm__ volatile ( "xchgb (%2),%0"
99 : "=q" (v)
100 : "0" (v), "r" (p)
101 : "memory");
102 }
103 inline void OrderAccess::store_fence(jshort* p, jshort v) {
104 __asm__ volatile ( "xchgw (%2),%0"
105 : "=r" (v)
106 : "0" (v), "r" (p)
107 : "memory");
108 }
109 inline void OrderAccess::store_fence(jint* p, jint v) {
110 __asm__ volatile ( "xchgl (%2),%0"
111 : "=r" (v)
112 : "0" (v), "r" (p)
113 : "memory");
114 }
115
116 inline void OrderAccess::store_fence(jlong* p, jlong v) {
117 #ifdef AMD64
118 __asm__ __volatile__ ("xchgq (%2), %0"
119 : "=r" (v)
120 : "0" (v), "r" (p)
121 : "memory");
122 #else
123 *p = v; fence();
124 #endif // AMD64
125 }
126
127 // AMD64 copied the bodies for the the signed version. 32bit did this. As long as the
128 // compiler does the inlining this is simpler.
129 inline void OrderAccess::store_fence(jubyte* p, jubyte v) { store_fence((jbyte*)p, (jbyte)v); }
130 inline void OrderAccess::store_fence(jushort* p, jushort v) { store_fence((jshort*)p, (jshort)v); }
131 inline void OrderAccess::store_fence(juint* p, juint v) { store_fence((jint*)p, (jint)v); }
132 inline void OrderAccess::store_fence(julong* p, julong v) { store_fence((jlong*)p, (jlong)v); }
133 inline void OrderAccess::store_fence(jfloat* p, jfloat v) { *p = v; fence(); }
134 inline void OrderAccess::store_fence(jdouble* p, jdouble v) { store_fence((jlong*)p, jlong_cast(v)); }
135
136 inline void OrderAccess::store_ptr_fence(intptr_t* p, intptr_t v) {
137 #ifdef AMD64
138 __asm__ __volatile__ ("xchgq (%2), %0"
139 : "=r" (v)
140 : "0" (v), "r" (p)
141 : "memory");
142 #else
143 store_fence((jint*)p, (jint)v);
144 #endif // AMD64
145 }
146
147 inline void OrderAccess::store_ptr_fence(void** p, void* v) {
148 #ifdef AMD64
149 __asm__ __volatile__ ("xchgq (%2), %0"
150 : "=r" (v)
151 : "0" (v), "r" (p)
152 : "memory");
153 #else
154 store_fence((jint*)p, (jint)v);
155 #endif // AMD64
156 }
157
158 // Must duplicate definitions instead of calling store_fence because we don't want to cast away volatile.
159 inline void OrderAccess::release_store_fence(volatile jbyte* p, jbyte v) {
160 __asm__ volatile ( "xchgb (%2),%0"
161 : "=q" (v)
162 : "0" (v), "r" (p)
163 : "memory");
164 }
165 inline void OrderAccess::release_store_fence(volatile jshort* p, jshort v) {
166 __asm__ volatile ( "xchgw (%2),%0"
167 : "=r" (v)
168 : "0" (v), "r" (p)
169 : "memory");
170 }
171 inline void OrderAccess::release_store_fence(volatile jint* p, jint v) {
172 __asm__ volatile ( "xchgl (%2),%0"
173 : "=r" (v)
174 : "0" (v), "r" (p)
175 : "memory");
176 }
177
178 inline void OrderAccess::release_store_fence(volatile jlong* p, jlong v) {
179 #ifdef AMD64
180 __asm__ __volatile__ ( "xchgq (%2), %0"
181 : "=r" (v)
182 : "0" (v), "r" (p)
183 : "memory");
184 #else
185 release_store(p, v); fence();
186 #endif // AMD64
187 }
188
189 inline void OrderAccess::release_store_fence(volatile jubyte* p, jubyte v) { release_store_fence((volatile jbyte*)p, (jbyte)v); }
190 inline void OrderAccess::release_store_fence(volatile jushort* p, jushort v) { release_store_fence((volatile jshort*)p, (jshort)v); }
191 inline void OrderAccess::release_store_fence(volatile juint* p, juint v) { release_store_fence((volatile jint*)p, (jint)v); }
192 inline void OrderAccess::release_store_fence(volatile julong* p, julong v) { release_store_fence((volatile jlong*)p, (jlong)v); }
193
194 inline void OrderAccess::release_store_fence(volatile jfloat* p, jfloat v) { *p = v; fence(); }
195 inline void OrderAccess::release_store_fence(volatile jdouble* p, jdouble v) { release_store_fence((volatile jlong*)p, jlong_cast(v)); }
196
197 inline void OrderAccess::release_store_ptr_fence(volatile intptr_t* p, intptr_t v) {
198 #ifdef AMD64
199 __asm__ __volatile__ ( "xchgq (%2), %0"
200 : "=r" (v)
201 : "0" (v), "r" (p)
202 : "memory");
203 #else
204 release_store_fence((volatile jint*)p, (jint)v);
205 #endif // AMD64
206 }
207 inline void OrderAccess::release_store_ptr_fence(volatile void* p, void* v) {
208 #ifdef AMD64
209 __asm__ __volatile__ ( "xchgq (%2), %0"
210 : "=r" (v)
211 : "0" (v), "r" (p)
212 : "memory");
213 #else
214 release_store_fence((volatile jint*)p, (jint)v);
215 #endif // AMD64
216 }
217
218 #endif // OS_CPU_LINUX_X86_VM_ORDERACCESS_LINUX_X86_INLINE_HPP