1 /*
   2  * Copyright (c) 1999, 2017, 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
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  24 
  25 #ifndef OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP
  26 #define OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP
  27 
  28 #include "runtime/os.hpp"
  29 
  30 // The following alternative implementations are needed because
  31 // Windows 95 doesn't support (some of) the corresponding Windows NT
  32 // calls. Furthermore, these versions allow inlining in the caller.
  33 // (More precisely: The documentation for InterlockedExchange says
  34 // it is supported for Windows 95. However, when single-stepping
  35 // through the assembly code we cannot step into the routine and
  36 // when looking at the routine address we see only garbage code.
  37 // Better safe then sorry!). Was bug 7/31/98 (gri).
  38 //
  39 // Performance note: On uniprocessors, the 'lock' prefixes are not
  40 // necessary (and expensive). We should generate separate cases if
  41 // this becomes a performance problem.
  42 
  43 #pragma warning(disable: 4035) // Disables warnings reporting missing return statement
  44 
  45 inline void Atomic::store    (jbyte    store_value, jbyte*    dest) { *dest = store_value; }
  46 inline void Atomic::store    (jshort   store_value, jshort*   dest) { *dest = store_value; }
  47 inline void Atomic::store    (jint     store_value, jint*     dest) { *dest = store_value; }
  48 
  49 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
  50 inline void Atomic::store_ptr(void*    store_value, void*     dest) { *(void**)dest = store_value; }
  51 
  52 inline void Atomic::store    (jbyte    store_value, volatile jbyte*    dest) { *dest = store_value; }
  53 inline void Atomic::store    (jshort   store_value, volatile jshort*   dest) { *dest = store_value; }
  54 inline void Atomic::store    (jint     store_value, volatile jint*     dest) { *dest = store_value; }
  55 
  56 
  57 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
  58 inline void Atomic::store_ptr(void*    store_value, volatile void*     dest) { *(void* volatile *)dest = store_value; }
  59 
  60 #ifdef AMD64
  61 inline void Atomic::store    (jlong    store_value, jlong*    dest) { *dest = store_value; }
  62 inline void Atomic::store    (jlong    store_value, volatile jlong*    dest) { *dest = store_value; }
  63 
  64 inline jint     Atomic::add    (jint     add_value, volatile jint*     dest) {
  65   return (jint)(*os::atomic_add_func)(add_value, dest);
  66 }
  67 
  68 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
  69   return (intptr_t)(*os::atomic_add_ptr_func)(add_value, dest);
  70 }
  71 
  72 inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
  73   return (void*)(*os::atomic_add_ptr_func)(add_value, (volatile intptr_t*)dest);
  74 }
  75 
  76 inline void Atomic::inc    (volatile jint*     dest) {
  77   (void)add    (1, dest);
  78 }
  79 
  80 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
  81   (void)add_ptr(1, dest);
  82 }
  83 
  84 inline void Atomic::inc_ptr(volatile void*     dest) {
  85   (void)add_ptr(1, dest);
  86 }
  87 
  88 inline void Atomic::dec    (volatile jint*     dest) {
  89   (void)add    (-1, dest);
  90 }
  91 
  92 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
  93   (void)add_ptr(-1, dest);
  94 }
  95 
  96 inline void Atomic::dec_ptr(volatile void*     dest) {
  97   (void)add_ptr(-1, dest);
  98 }
  99 
 100 inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {
 101   return (jint)(*os::atomic_xchg_func)(exchange_value, dest);
 102 }
 103 
 104 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
 105   return (intptr_t)(os::atomic_xchg_ptr_func)(exchange_value, dest);
 106 }
 107 
 108 inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {
 109   return (void *)(os::atomic_xchg_ptr_func)((intptr_t)exchange_value, (volatile intptr_t*)dest);
 110 }
 111 
 112 inline jint     Atomic::cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value, cmpxchg_memory_order order) {
 113   return (*os::atomic_cmpxchg_func)(exchange_value, dest, compare_value);
 114 }
 115 
 116 #define VM_HAS_SPECIALIZED_CMPXCHG_BYTE
 117 inline jbyte    Atomic::cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value, cmpxchg_memory_order order) {
 118     return (*os::atomic_cmpxchg_byte_func)(exchange_value, dest, compare_value);
 119 }
 120 
 121 inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {
 122   return (*os::atomic_cmpxchg_long_func)(exchange_value, dest, compare_value);
 123 }
 124 
 125 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
 126   return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);
 127 }
 128 
 129 inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {
 130   return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);
 131 }
 132 
 133 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
 134 
 135 #else // !AMD64
 136 
 137 inline jint     Atomic::add    (jint     add_value, volatile jint*     dest) {
 138   __asm {
 139     mov edx, dest;
 140     mov eax, add_value;
 141     mov ecx, eax;
 142     lock xadd dword ptr [edx], eax;
 143     add eax, ecx;
 144   }
 145 }
 146 
 147 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
 148   return (intptr_t)add((jint)add_value, (volatile jint*)dest);
 149 }
 150 
 151 inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
 152   return (void*)add((jint)add_value, (volatile jint*)dest);
 153 }
 154 
 155 inline void Atomic::inc    (volatile jint*     dest) {
 156   // alternative for InterlockedIncrement
 157   __asm {
 158     mov edx, dest;
 159     lock add dword ptr [edx], 1;
 160   }
 161 }
 162 
 163 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
 164   inc((volatile jint*)dest);
 165 }
 166 
 167 inline void Atomic::inc_ptr(volatile void*     dest) {
 168   inc((volatile jint*)dest);
 169 }
 170 
 171 inline void Atomic::dec    (volatile jint*     dest) {
 172   // alternative for InterlockedDecrement
 173   __asm {
 174     mov edx, dest;
 175     lock sub dword ptr [edx], 1;
 176   }
 177 }
 178 
 179 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
 180   dec((volatile jint*)dest);
 181 }
 182 
 183 inline void Atomic::dec_ptr(volatile void*     dest) {
 184   dec((volatile jint*)dest);
 185 }
 186 
 187 inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {
 188   // alternative for InterlockedExchange
 189   __asm {
 190     mov eax, exchange_value;
 191     mov ecx, dest;
 192     xchg eax, dword ptr [ecx];
 193   }
 194 }
 195 
 196 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
 197   return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
 198 }
 199 
 200 inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {
 201   return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
 202 }
 203 
 204 #define VM_HAS_SPECIALIZED_CMPXCHG_BYTE
 205 inline jbyte    Atomic::cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value, cmpxchg_memory_order order) {
 206   // alternative for InterlockedCompareExchange
 207   __asm {
 208     mov edx, dest
 209     mov cl, exchange_value
 210     mov al, compare_value
 211     lock cmpxchg byte ptr [edx], cl
 212   }
 213 }
 214 
 215 inline jint     Atomic::cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value, cmpxchg_memory_order order) {
 216   // alternative for InterlockedCompareExchange
 217   __asm {
 218     mov edx, dest
 219     mov ecx, exchange_value
 220     mov eax, compare_value
 221     lock cmpxchg dword ptr [edx], ecx
 222   }
 223 }
 224 
 225 inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {
 226   jint ex_lo  = (jint)exchange_value;
 227   jint ex_hi  = *( ((jint*)&exchange_value) + 1 );
 228   jint cmp_lo = (jint)compare_value;
 229   jint cmp_hi = *( ((jint*)&compare_value) + 1 );
 230   __asm {
 231     push ebx
 232     push edi
 233     mov eax, cmp_lo
 234     mov edx, cmp_hi
 235     mov edi, dest
 236     mov ebx, ex_lo
 237     mov ecx, ex_hi
 238     lock cmpxchg8b qword ptr [edi]
 239     pop edi
 240     pop ebx
 241   }
 242 }
 243 
 244 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
 245   return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);
 246 }
 247 
 248 inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {
 249   return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);
 250 }
 251 
 252 inline jlong Atomic::load(const volatile jlong* src) {
 253   volatile jlong dest;
 254   volatile jlong* pdest = &dest;
 255   __asm {
 256     mov eax, src
 257     fild     qword ptr [eax]
 258     mov eax, pdest
 259     fistp    qword ptr [eax]
 260   }
 261   return dest;
 262 }
 263 
 264 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
 265   volatile jlong* src = &store_value;
 266   __asm {
 267     mov eax, src
 268     fild     qword ptr [eax]
 269     mov eax, dest
 270     fistp    qword ptr [eax]
 271   }
 272 }
 273 
 274 inline void Atomic::store(jlong store_value, jlong* dest) {
 275   Atomic::store(store_value, (volatile jlong*)dest);
 276 }
 277 
 278 #endif // AMD64
 279 
 280 #pragma warning(default: 4035) // Enables warnings reporting missing return statement
 281 
 282 #endif // OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP