1 /*
2 * Copyright (c) 2003, 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_SOLARIS_X86_VM_ORDERACCESS_SOLARIS_X86_INLINE_HPP
26 #define OS_CPU_SOLARIS_X86_VM_ORDERACCESS_SOLARIS_X86_INLINE_HPP
27
28 #include "runtime/orderAccess.hpp"
29
30 // Implementation of class OrderAccess.
31
32 // For Sun Studio - implementation is in solaris_i486.il.
33 // For gcc - implementation is just below.
34 extern "C" void _OrderAccess_acquire();
35 extern "C" void _OrderAccess_fence();
36
37 inline void OrderAccess::loadload() { acquire(); }
38 inline void OrderAccess::storestore() { release(); }
39 inline void OrderAccess::loadstore() { acquire(); }
40 inline void OrderAccess::storeload() { fence(); }
41
42 inline void OrderAccess::acquire() {
43 _OrderAccess_acquire();
44
45 }
46
47 inline void OrderAccess::release() {
48 // Avoid hitting the same cache-line from
49 // different threads.
50 volatile jint local_dummy = 0;
51 }
52
53 inline void OrderAccess::fence() {
54 if (os::is_MP()) {
55 _OrderAccess_fence();
56 }
57 }
58
59 #ifdef _GNU_SOURCE
60
61 extern "C" {
62 inline void _OrderAccess_acquire() {
63 volatile intptr_t local_dummy;
64 #ifdef AMD64
65 __asm__ volatile ("movq 0(%%rsp), %0" : "=r" (local_dummy) : : "memory");
66 #else
67 __asm__ volatile ("movl 0(%%esp),%0" : "=r" (local_dummy) : : "memory");
68 #endif // AMD64
69 }
70 inline void _OrderAccess_fence() {
71 // Always use locked addl since mfence is sometimes expensive
72 __asm__ volatile ("lock; addl $0,0(%%esp)" : : : "cc", "memory");
73 }
74
75 }
76
77 #endif // GNU_SOURCE
78
79 inline jbyte OrderAccess::load_acquire(volatile jbyte* p) { return *p; }
80 inline jshort OrderAccess::load_acquire(volatile jshort* p) { return *p; }
81 inline jint OrderAccess::load_acquire(volatile jint* p) { return *p; }
82 inline jlong OrderAccess::load_acquire(volatile jlong* p) { return *p; }
83 inline jubyte OrderAccess::load_acquire(volatile jubyte* p) { return *p; }
84 inline jushort OrderAccess::load_acquire(volatile jushort* p) { return *p; }
85 inline juint OrderAccess::load_acquire(volatile juint* p) { return *p; }
86 inline julong OrderAccess::load_acquire(volatile julong* p) { return *p; }
87 inline jfloat OrderAccess::load_acquire(volatile jfloat* p) { return *p; }
88 inline jdouble OrderAccess::load_acquire(volatile jdouble* p) { return *p; }
89
90 inline intptr_t OrderAccess::load_ptr_acquire(volatile intptr_t* p) { return *p; }
91 inline void* OrderAccess::load_ptr_acquire(volatile void* p) { return *(void* volatile *)p; }
92 inline void* OrderAccess::load_ptr_acquire(const volatile void* p) { return *(void* const volatile *)p; }
93
94 inline void OrderAccess::release_store(volatile jbyte* p, jbyte v) { *p = v; }
95 inline void OrderAccess::release_store(volatile jshort* p, jshort v) { *p = v; }
96 inline void OrderAccess::release_store(volatile jint* p, jint v) { *p = v; }
97 inline void OrderAccess::release_store(volatile jlong* p, jlong v) { *p = v; }
98 inline void OrderAccess::release_store(volatile jubyte* p, jubyte v) { *p = v; }
99 inline void OrderAccess::release_store(volatile jushort* p, jushort v) { *p = v; }
100 inline void OrderAccess::release_store(volatile juint* p, juint v) { *p = v; }
101 inline void OrderAccess::release_store(volatile julong* p, julong v) { *p = v; }
102 inline void OrderAccess::release_store(volatile jfloat* p, jfloat v) { *p = v; }
103 inline void OrderAccess::release_store(volatile jdouble* p, jdouble v) { *p = v; }
104
105 inline void OrderAccess::release_store_ptr(volatile intptr_t* p, intptr_t v) { *p = v; }
106 inline void OrderAccess::release_store_ptr(volatile void* p, void* v) { *(void* volatile *)p = v; }
107
108 inline void OrderAccess::store_fence(jbyte* p, jbyte v) { *p = v; fence(); }
109 inline void OrderAccess::store_fence(jshort* p, jshort v) { *p = v; fence(); }
110 inline void OrderAccess::store_fence(jint* p, jint v) { *p = v; fence(); }
111 inline void OrderAccess::store_fence(jlong* p, jlong v) { *p = v; fence(); }
112 inline void OrderAccess::store_fence(jubyte* p, jubyte v) { *p = v; fence(); }
113 inline void OrderAccess::store_fence(jushort* p, jushort v) { *p = v; fence(); }
114 inline void OrderAccess::store_fence(juint* p, juint v) { *p = v; fence(); }
115 inline void OrderAccess::store_fence(julong* p, julong v) { *p = v; fence(); }
116 inline void OrderAccess::store_fence(jfloat* p, jfloat v) { *p = v; fence(); }
117 inline void OrderAccess::store_fence(jdouble* p, jdouble v) { *p = v; fence(); }
118
119 inline void OrderAccess::store_ptr_fence(intptr_t* p, intptr_t v) { *p = v; fence(); }
120 inline void OrderAccess::store_ptr_fence(void** p, void* v) { *p = v; fence(); }
121
122 inline void OrderAccess::release_store_fence(volatile jbyte* p, jbyte v) { *p = v; fence(); }
123 inline void OrderAccess::release_store_fence(volatile jshort* p, jshort v) { *p = v; fence(); }
124 inline void OrderAccess::release_store_fence(volatile jint* p, jint v) { *p = v; fence(); }
125 inline void OrderAccess::release_store_fence(volatile jlong* p, jlong v) { *p = v; fence(); }
126 inline void OrderAccess::release_store_fence(volatile jubyte* p, jubyte v) { *p = v; fence(); }
127 inline void OrderAccess::release_store_fence(volatile jushort* p, jushort v) { *p = v; fence(); }
128 inline void OrderAccess::release_store_fence(volatile juint* p, juint v) { *p = v; fence(); }
129 inline void OrderAccess::release_store_fence(volatile julong* p, julong v) { *p = v; fence(); }
130 inline void OrderAccess::release_store_fence(volatile jfloat* p, jfloat v) { *p = v; fence(); }
131 inline void OrderAccess::release_store_fence(volatile jdouble* p, jdouble v) { *p = v; fence(); }
132
133 inline void OrderAccess::release_store_ptr_fence(volatile intptr_t* p, intptr_t v) { *p = v; fence(); }
134 inline void OrderAccess::release_store_ptr_fence(volatile void* p, void* v) { *(void* volatile *)p = v; fence(); }
135
136 #endif // OS_CPU_SOLARIS_X86_VM_ORDERACCESS_SOLARIS_X86_INLINE_HPP