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1 /*
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2 * Copyright 1999-2007 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 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
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26 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
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27 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
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28
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29
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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 inline void Atomic::inc (volatile jint* dest) { (void)add (1, dest); }
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40 inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); }
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41 inline void Atomic::inc_ptr(volatile void* dest) { (void)add_ptr(1, dest); }
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42
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43 inline void Atomic::dec (volatile jint* dest) { (void)add (-1, dest); }
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44 inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); }
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45 inline void Atomic::dec_ptr(volatile void* dest) { (void)add_ptr(-1, dest); }
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46
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47 // For Sun Studio - implementation is in solaris_x86_[32/64].il.
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48 // For gcc - implementation is just below.
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49
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50 extern "C" jint _Atomic_add(jint add_value, volatile jint* dest, int mp);
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51 extern "C" jint _Atomic_xchg(jint exchange_value, volatile jint* dest);
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52 extern "C" jint _Atomic_cmpxchg(jint exchange_value, volatile jint* dest, jint compare_value, int mp);
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53 extern "C" jlong _Atomic_cmpxchg_long(jlong exchange_value, volatile jlong* dest, jlong compare_value, int mp);
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54
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55 inline jint Atomic::add (jint add_value, volatile jint* dest) {
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56 return _Atomic_add(add_value, dest, (int) os::is_MP());
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57 }
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58
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59 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
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60 return _Atomic_cmpxchg(exchange_value, dest, compare_value, (int) os::is_MP());
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61 }
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62
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63 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
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64 return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, (int) os::is_MP());
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65 }
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66
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67
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68 #ifdef AMD64
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69 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
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70 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
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71 extern "C" jlong _Atomic_add_long(jlong add_value, volatile jlong* dest, int mp);
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72 extern "C" jlong _Atomic_xchg_long(jlong exchange_value, volatile jlong* dest);
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73
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74 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
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75 return (intptr_t)_Atomic_add_long((jlong)add_value, (volatile jlong*)dest, (int) os::is_MP());
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76 }
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77
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78 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
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79 return (void*)_Atomic_add_long((jlong)add_value, (volatile jlong*)dest, (int) os::is_MP());
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80 }
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81
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82 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
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83 return _Atomic_xchg(exchange_value, dest);
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84 }
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85
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86 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
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87 return (intptr_t)_Atomic_xchg_long((jlong)exchange_value, (volatile jlong*)dest);
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88 }
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89
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90 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
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91 return (void*)_Atomic_xchg_long((jlong)exchange_value, (volatile jlong*)dest);
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92 }
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93
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94 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
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95 return (intptr_t)_Atomic_cmpxchg_long((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, (int) os::is_MP());
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96 }
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97
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98 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
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99 return (void*)_Atomic_cmpxchg_long((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, (int) os::is_MP());
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100 }
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101
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102 #else // !AMD64
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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 return (intptr_t)add((jint)add_value, (volatile jint*)dest);
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106 }
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107
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108 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
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109 return (void*)add((jint)add_value, (volatile jint*)dest);
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110 }
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111
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112 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
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113 // We noticed a CC5.5 bug (4894807), so keep calling the stub just to be safe.
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114 // Will use the inline template version after 4894807 is fixed.
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115 // return _Atomic_xchg(exchange_value, dest);
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116 return (*os::atomic_xchg_func)(exchange_value, dest);
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117 }
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118
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119 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
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120 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
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121 }
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122
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123 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
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124 return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
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125 }
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126
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127 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
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128 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
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129 }
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130
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131 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
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132 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
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133 }
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134 #endif // AMD64
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135
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136 #ifdef _GNU_SOURCE
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137 // Add a lock prefix to an instruction on an MP machine
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138 #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: "
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139
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140 extern "C" {
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141 inline jint _Atomic_add(jint add_value, volatile jint* dest, int mp) {
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142 jint addend = add_value;
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143 __asm__ volatile ( LOCK_IF_MP(%3) "xaddl %0,(%2)"
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144 : "=r" (addend)
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145 : "0" (addend), "r" (dest), "r" (mp)
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146 : "cc", "memory");
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147 return addend + add_value;
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148 }
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149
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150 #ifdef AMD64
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151 inline jlong _Atomic_add_long(jlong add_value, volatile jlong* dest, int mp) {
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152 intptr_t addend = add_value;
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153 __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)"
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154 : "=r" (addend)
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155 : "0" (addend), "r" (dest), "r" (mp)
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156 : "cc", "memory");
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157 return addend + add_value;
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158 }
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159
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160 inline jlong _Atomic_xchg_long(jlong exchange_value, volatile jlong* dest) {
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161 __asm__ __volatile__ ("xchgq (%2),%0"
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162 : "=r" (exchange_value)
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163 : "0" (exchange_value), "r" (dest)
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164 : "memory");
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165 return exchange_value;
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166 }
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167
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168 #endif // AMD64
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169
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170 inline jint _Atomic_xchg(jint exchange_value, volatile jint* dest) {
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171
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172 // 32bit version originally did nothing!!
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173
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174 __asm__ __volatile__ ("xchgl (%2),%0"
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175 : "=r" (exchange_value)
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176 : "0" (exchange_value), "r" (dest)
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177 : "memory");
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178 return exchange_value;
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179 }
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180
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181 inline jint _Atomic_cmpxchg(jint exchange_value, volatile jint* dest, jint compare_value, int mp) {
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182 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"
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183 : "=a" (exchange_value)
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184 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
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185 : "cc", "memory");
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186 return exchange_value;
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187 }
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188
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189 // This is the interface to the atomic instruction in solaris_i486.s.
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190 jlong _Atomic_cmpxchg_long_gcc(jlong exchange_value, volatile jlong* dest, jlong compare_value, int mp);
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191
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192 inline jlong _Atomic_cmpxchg_long(jlong exchange_value, volatile jlong* dest, jlong compare_value, int mp) {
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193 #ifdef AMD64
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194 __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)"
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195 : "=a" (exchange_value)
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196 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
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197 : "cc", "memory");
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198 return exchange_value;
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199 #else
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200 return _Atomic_cmpxchg_long_gcc(exchange_value, dest, compare_value, os::is_MP());
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201
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202 #if 0
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203 // The code below does not work presumably because of the bug in gcc
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204 // The error message says:
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205 // can't find a register in class BREG while reloading asm
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206 // However I want to save this code and later replace _Atomic_cmpxchg_long_gcc
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207 // with such inline asm code:
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208
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209 volatile jlong_accessor evl, cvl, rv;
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210 evl.long_value = exchange_value;
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211 cvl.long_value = compare_value;
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212 int mp = os::is_MP();
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213
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214 __asm__ volatile ("cmp $0, %%esi\n\t"
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215 "je 1f \n\t"
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216 "lock\n\t"
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217 "1: cmpxchg8b (%%edi)\n\t"
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218 : "=a"(cvl.words[0]), "=d"(cvl.words[1])
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219 : "a"(cvl.words[0]), "d"(cvl.words[1]),
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220 "b"(evl.words[0]), "c"(evl.words[1]),
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221 "D"(dest), "S"(mp)
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222 : "cc", "memory");
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223 return cvl.long_value;
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224 #endif // if 0
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225 #endif // AMD64
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226 }
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227 }
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228 #undef LOCK_IF_MP
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229
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230 #endif // _GNU_SOURCE
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