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1 /*
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2 * Copyright 1999-2005 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 atomic
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26
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27 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
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28 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
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29 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
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30 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
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31 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
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32
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33 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
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34 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
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35 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
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36 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
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37 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
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38
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39
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40 // Adding a lock prefix to an instruction on MP machine
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41 #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: "
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42
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43 inline jint Atomic::add (jint add_value, volatile jint* dest) {
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44 jint addend = add_value;
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45 int mp = os::is_MP();
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46 __asm__ volatile ( LOCK_IF_MP(%3) "xaddl %0,(%2)"
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47 : "=r" (addend)
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48 : "0" (addend), "r" (dest), "r" (mp)
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49 : "cc", "memory");
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50 return addend + add_value;
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51 }
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52
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53 inline void Atomic::inc (volatile jint* dest) {
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54 int mp = os::is_MP();
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55 __asm__ volatile (LOCK_IF_MP(%1) "addl $1,(%0)" :
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56 : "r" (dest), "r" (mp) : "cc", "memory");
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57 }
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58
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59 inline void Atomic::inc_ptr(volatile void* dest) {
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60 inc_ptr((volatile intptr_t*)dest);
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61 }
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62
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63 inline void Atomic::dec (volatile jint* dest) {
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64 int mp = os::is_MP();
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65 __asm__ volatile (LOCK_IF_MP(%1) "subl $1,(%0)" :
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66 : "r" (dest), "r" (mp) : "cc", "memory");
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67 }
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68
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69 inline void Atomic::dec_ptr(volatile void* dest) {
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70 dec_ptr((volatile intptr_t*)dest);
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71 }
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72
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73 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
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74 __asm__ volatile ( "xchgl (%2),%0"
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75 : "=r" (exchange_value)
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76 : "0" (exchange_value), "r" (dest)
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77 : "memory");
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78 return exchange_value;
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79 }
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80
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81 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
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82 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
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83 }
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84
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85
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86 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
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87 int mp = os::is_MP();
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88 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"
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89 : "=a" (exchange_value)
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90 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
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91 : "cc", "memory");
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92 return exchange_value;
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93 }
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94
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95 extern "C" {
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96 // defined in linux_x86.s
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97 jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
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98 }
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99
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100 #ifdef AMD64
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101 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
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102 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
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103
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104 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
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105 intptr_t addend = add_value;
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106 bool mp = os::is_MP();
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107 __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)"
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108 : "=r" (addend)
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109 : "0" (addend), "r" (dest), "r" (mp)
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110 : "cc", "memory");
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111 return addend + add_value;
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112 }
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113
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114 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
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115 return (void*)add_ptr(add_value, (volatile intptr_t*)dest);
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116 }
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117
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118 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
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119 bool mp = os::is_MP();
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120 __asm__ __volatile__ (LOCK_IF_MP(%1) "addq $1,(%0)"
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121 :
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122 : "r" (dest), "r" (mp)
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123 : "cc", "memory");
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124 }
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125
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126 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
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127 bool mp = os::is_MP();
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128 __asm__ __volatile__ (LOCK_IF_MP(%1) "subq $1,(%0)"
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129 :
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130 : "r" (dest), "r" (mp)
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131 : "cc", "memory");
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132 }
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133
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134 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
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135 __asm__ __volatile__ ("xchgq (%2),%0"
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136 : "=r" (exchange_value)
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137 : "0" (exchange_value), "r" (dest)
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138 : "memory");
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139 return exchange_value;
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140 }
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141
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142 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
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143 bool mp = os::is_MP();
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144 __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)"
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145 : "=a" (exchange_value)
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146 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
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147 : "cc", "memory");
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148 return exchange_value;
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149 }
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150
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151 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
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152 return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
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153 }
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154
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155 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
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156 return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
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157 }
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158
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159 #else
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160 //inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
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161 //inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
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162
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163 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
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164 return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest);
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165 }
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166
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167 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
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168 return (void*)Atomic::add((jint)add_value, (volatile jint*)dest);
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169 }
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170
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171
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172 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
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173 inc((volatile jint*)dest);
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174 }
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175
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176 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
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177 dec((volatile jint*)dest);
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178 }
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179
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180 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
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181 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
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182 }
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183
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184 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
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185 return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP());
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186 }
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187
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188 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
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189 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
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190 }
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191
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192 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
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193 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
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194 }
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195 #endif // AMD64
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