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1 /*
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2 * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Implementation of class OrderAccess.
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26
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27 // For Sun Studio - implementation is in solaris_i486.il.
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28 // For gcc - implementation is just below.
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29 extern "C" void _OrderAccess_acquire();
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30 extern "C" void _OrderAccess_fence();
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31
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32 inline void OrderAccess::loadload() { acquire(); }
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33 inline void OrderAccess::storestore() { release(); }
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34 inline void OrderAccess::loadstore() { acquire(); }
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35 inline void OrderAccess::storeload() { fence(); }
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36
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37 inline void OrderAccess::acquire() {
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38 _OrderAccess_acquire();
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39
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40 }
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41
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42 inline void OrderAccess::release() {
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43 dummy = 0;
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44 }
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45
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46 inline void OrderAccess::fence() {
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47 if (os::is_MP()) {
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48 _OrderAccess_fence();
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49 }
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50 }
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51
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52 #ifdef _GNU_SOURCE
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53
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54 extern "C" {
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55 inline void _OrderAccess_acquire() {
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56 volatile intptr_t dummy;
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57 #ifdef AMD64
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58 __asm__ volatile ("movq 0(%%rsp), %0" : "=r" (dummy) : : "memory");
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59 #else
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60 __asm__ volatile ("movl 0(%%esp),%0" : "=r" (dummy) : : "memory");
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61 #endif // AMD64
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62 }
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63 inline void _OrderAccess_fence() {
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64 #ifdef AMD64
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65 __asm__ __volatile__ ("mfence":::"memory");
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66 #else
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67 __asm__ volatile ("lock; addl $0,0(%%esp)" : : : "cc", "memory");
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68 #endif // AMD64
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69 }
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70
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71 }
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72
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73 #endif // GNU_SOURCE
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74
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75 inline jbyte OrderAccess::load_acquire(volatile jbyte* p) { return *p; }
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76 inline jshort OrderAccess::load_acquire(volatile jshort* p) { return *p; }
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77 inline jint OrderAccess::load_acquire(volatile jint* p) { return *p; }
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78 inline jlong OrderAccess::load_acquire(volatile jlong* p) { return *p; }
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79 inline jubyte OrderAccess::load_acquire(volatile jubyte* p) { return *p; }
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80 inline jushort OrderAccess::load_acquire(volatile jushort* p) { return *p; }
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81 inline juint OrderAccess::load_acquire(volatile juint* p) { return *p; }
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82 inline julong OrderAccess::load_acquire(volatile julong* p) { return *p; }
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83 inline jfloat OrderAccess::load_acquire(volatile jfloat* p) { return *p; }
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84 inline jdouble OrderAccess::load_acquire(volatile jdouble* p) { return *p; }
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85
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86 inline intptr_t OrderAccess::load_ptr_acquire(volatile intptr_t* p) { return *p; }
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87 inline void* OrderAccess::load_ptr_acquire(volatile void* p) { return *(void* volatile *)p; }
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88 inline void* OrderAccess::load_ptr_acquire(const volatile void* p) { return *(void* const volatile *)p; }
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89
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90 inline void OrderAccess::release_store(volatile jbyte* p, jbyte v) { *p = v; }
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91 inline void OrderAccess::release_store(volatile jshort* p, jshort v) { *p = v; }
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92 inline void OrderAccess::release_store(volatile jint* p, jint v) { *p = v; }
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93 inline void OrderAccess::release_store(volatile jlong* p, jlong v) { *p = v; }
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94 inline void OrderAccess::release_store(volatile jubyte* p, jubyte v) { *p = v; }
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95 inline void OrderAccess::release_store(volatile jushort* p, jushort v) { *p = v; }
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96 inline void OrderAccess::release_store(volatile juint* p, juint v) { *p = v; }
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97 inline void OrderAccess::release_store(volatile julong* p, julong v) { *p = v; }
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98 inline void OrderAccess::release_store(volatile jfloat* p, jfloat v) { *p = v; }
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99 inline void OrderAccess::release_store(volatile jdouble* p, jdouble v) { *p = v; }
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100
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101 inline void OrderAccess::release_store_ptr(volatile intptr_t* p, intptr_t v) { *p = v; }
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102 inline void OrderAccess::release_store_ptr(volatile void* p, void* v) { *(void* volatile *)p = v; }
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103
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104 inline void OrderAccess::store_fence(jbyte* p, jbyte v) { *p = v; fence(); }
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105 inline void OrderAccess::store_fence(jshort* p, jshort v) { *p = v; fence(); }
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106 inline void OrderAccess::store_fence(jint* p, jint v) { *p = v; fence(); }
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107 inline void OrderAccess::store_fence(jlong* p, jlong v) { *p = v; fence(); }
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108 inline void OrderAccess::store_fence(jubyte* p, jubyte v) { *p = v; fence(); }
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109 inline void OrderAccess::store_fence(jushort* p, jushort v) { *p = v; fence(); }
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110 inline void OrderAccess::store_fence(juint* p, juint v) { *p = v; fence(); }
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111 inline void OrderAccess::store_fence(julong* p, julong v) { *p = v; fence(); }
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112 inline void OrderAccess::store_fence(jfloat* p, jfloat v) { *p = v; fence(); }
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113 inline void OrderAccess::store_fence(jdouble* p, jdouble v) { *p = v; fence(); }
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114
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115 inline void OrderAccess::store_ptr_fence(intptr_t* p, intptr_t v) { *p = v; fence(); }
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116 inline void OrderAccess::store_ptr_fence(void** p, void* v) { *p = v; fence(); }
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117
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118 inline void OrderAccess::release_store_fence(volatile jbyte* p, jbyte v) { *p = v; fence(); }
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119 inline void OrderAccess::release_store_fence(volatile jshort* p, jshort v) { *p = v; fence(); }
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120 inline void OrderAccess::release_store_fence(volatile jint* p, jint v) { *p = v; fence(); }
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121 inline void OrderAccess::release_store_fence(volatile jlong* p, jlong v) { *p = v; fence(); }
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122 inline void OrderAccess::release_store_fence(volatile jubyte* p, jubyte v) { *p = v; fence(); }
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123 inline void OrderAccess::release_store_fence(volatile jushort* p, jushort v) { *p = v; fence(); }
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124 inline void OrderAccess::release_store_fence(volatile juint* p, juint v) { *p = v; fence(); }
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125 inline void OrderAccess::release_store_fence(volatile julong* p, julong v) { *p = v; fence(); }
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126 inline void OrderAccess::release_store_fence(volatile jfloat* p, jfloat v) { *p = v; fence(); }
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127 inline void OrderAccess::release_store_fence(volatile jdouble* p, jdouble v) { *p = v; fence(); }
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128
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129 inline void OrderAccess::release_store_ptr_fence(volatile intptr_t* p, intptr_t v) { *p = v; fence(); }
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130 inline void OrderAccess::release_store_ptr_fence(volatile void* p, void* v) { *(void* volatile *)p = v; fence(); }
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