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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 // The following alternative implementations are needed because
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26 // Windows 95 doesn't support (some of) the corresponding Windows NT
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27 // calls. Furthermore, these versions allow inlining in the caller.
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28 // (More precisely: The documentation for InterlockedExchange says
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29 // it is supported for Windows 95. However, when single-stepping
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30 // through the assembly code we cannot step into the routine and
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31 // when looking at the routine address we see only garbage code.
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32 // Better safe then sorry!). Was bug 7/31/98 (gri).
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33 //
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34 // Performance note: On uniprocessors, the 'lock' prefixes are not
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35 // necessary (and expensive). We should generate separate cases if
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36 // this becomes a performance problem.
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37
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38 #pragma warning(disable: 4035) // Disables warnings reporting missing return statement
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39
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40 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
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41 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
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42 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
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43
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44 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
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45 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
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46
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47 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
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48 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
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49 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
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50
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51
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52 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
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53 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
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54
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55 // Adding a lock prefix to an instruction on MP machine
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56 // VC++ doesn't like the lock prefix to be on a single line
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57 // so we can't insert a label after the lock prefix.
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58 // By emitting a lock prefix, we can define a label after it.
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59 #define LOCK_IF_MP(mp) __asm cmp mp, 0 \
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60 __asm je L0 \
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61 __asm _emit 0xF0 \
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62 __asm L0:
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63
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64 #ifdef AMD64
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65 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
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66 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
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67
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68 inline jint Atomic::add (jint add_value, volatile jint* dest) {
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69 return (jint)(*os::atomic_add_func)(add_value, dest);
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70 }
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71
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72 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
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73 return (intptr_t)(*os::atomic_add_ptr_func)(add_value, dest);
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74 }
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75
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76 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
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77 return (void*)(*os::atomic_add_ptr_func)(add_value, (volatile intptr_t*)dest);
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78 }
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79
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80 inline void Atomic::inc (volatile jint* dest) {
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81 (void)add (1, dest);
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82 }
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83
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84 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
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85 (void)add_ptr(1, dest);
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86 }
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87
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88 inline void Atomic::inc_ptr(volatile void* dest) {
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89 (void)add_ptr(1, dest);
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90 }
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91
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92 inline void Atomic::dec (volatile jint* dest) {
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93 (void)add (-1, dest);
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94 }
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95
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96 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
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97 (void)add_ptr(-1, dest);
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98 }
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99
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100 inline void Atomic::dec_ptr(volatile void* dest) {
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101 (void)add_ptr(-1, dest);
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102 }
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103
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104 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
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105 return (jint)(*os::atomic_xchg_func)(exchange_value, dest);
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106 }
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107
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108 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
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109 return (intptr_t)(os::atomic_xchg_ptr_func)(exchange_value, dest);
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110 }
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111
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112 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
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113 return (void *)(os::atomic_xchg_ptr_func)((intptr_t)exchange_value, (volatile intptr_t*)dest);
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114 }
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115
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116 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
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117 return (*os::atomic_cmpxchg_func)(exchange_value, dest, compare_value);
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118 }
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119
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120 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
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121 return (*os::atomic_cmpxchg_long_func)(exchange_value, dest, compare_value);
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122 }
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123
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124 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
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125 return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
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126 }
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127
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128 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
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129 return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
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130 }
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131
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132 #else // !AMD64
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133
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134 //inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
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135 //inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
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136 inline jint Atomic::add (jint add_value, volatile jint* dest) {
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137 int mp = os::is_MP();
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138 __asm {
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139 mov edx, dest;
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140 mov eax, add_value;
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141 mov ecx, eax;
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142 LOCK_IF_MP(mp)
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143 xadd dword ptr [edx], eax;
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144 add eax, ecx;
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145 }
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146 }
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147
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148 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
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149 return (intptr_t)add((jint)add_value, (volatile jint*)dest);
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150 }
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151
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152 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
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153 return (void*)add((jint)add_value, (volatile jint*)dest);
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154 }
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155
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156 inline void Atomic::inc (volatile jint* dest) {
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157 // alternative for InterlockedIncrement
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158 int mp = os::is_MP();
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159 __asm {
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160 mov edx, dest;
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161 LOCK_IF_MP(mp)
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162 add dword ptr [edx], 1;
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163 }
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164 }
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165
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166 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
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167 inc((volatile jint*)dest);
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168 }
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169
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170 inline void Atomic::inc_ptr(volatile void* dest) {
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171 inc((volatile jint*)dest);
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172 }
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173
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174 inline void Atomic::dec (volatile jint* dest) {
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175 // alternative for InterlockedDecrement
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176 int mp = os::is_MP();
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177 __asm {
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178 mov edx, dest;
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179 LOCK_IF_MP(mp)
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180 sub dword ptr [edx], 1;
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181 }
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182 }
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183
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184 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
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185 dec((volatile jint*)dest);
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186 }
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187
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188 inline void Atomic::dec_ptr(volatile void* dest) {
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189 dec((volatile jint*)dest);
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190 }
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191
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192 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
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193 // alternative for InterlockedExchange
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194 __asm {
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195 mov eax, exchange_value;
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196 mov ecx, dest;
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197 xchg eax, dword ptr [ecx];
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198 }
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199 }
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200
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201 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
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202 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
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203 }
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204
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205 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
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206 return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
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207 }
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208
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209 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
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210 // alternative for InterlockedCompareExchange
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211 int mp = os::is_MP();
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212 __asm {
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213 mov edx, dest
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214 mov ecx, exchange_value
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215 mov eax, compare_value
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216 LOCK_IF_MP(mp)
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217 cmpxchg dword ptr [edx], ecx
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218 }
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219 }
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220
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221 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
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222 int mp = os::is_MP();
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223 jint ex_lo = (jint)exchange_value;
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224 jint ex_hi = *( ((jint*)&exchange_value) + 1 );
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225 jint cmp_lo = (jint)compare_value;
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226 jint cmp_hi = *( ((jint*)&compare_value) + 1 );
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227 __asm {
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228 push ebx
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229 push edi
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230 mov eax, cmp_lo
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231 mov edx, cmp_hi
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232 mov edi, dest
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233 mov ebx, ex_lo
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234 mov ecx, ex_hi
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235 LOCK_IF_MP(mp)
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236 cmpxchg8b qword ptr [edi]
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237 pop edi
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238 pop ebx
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239 }
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240 }
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241
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242 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
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243 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
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244 }
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245
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246 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
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247 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
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248 }
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249 #endif // AMD64
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250
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251 #pragma warning(default: 4035) // Enables warnings reporting missing return statement
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