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
21 * questions.
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23 */
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 #define DEFINE_STUB_CMPXCHG(ByteSize, StubType, StubName) \
113 template<> \
114 template<typename T> \
115 inline T Atomic::PlatformCmpxchg<ByteSize>::operator()(T exchange_value, \
116 T volatile* dest, \
117 T compare_value, \
118 cmpxchg_memory_order order) const { \
119 STATIC_ASSERT(ByteSize == sizeof(T)); \
120 return cmpxchg_using_helper<StubType>(StubName, exchange_value, dest, compare_value); \
121 }
122
123 DEFINE_STUB_CMPXCHG(1, jbyte, os::atomic_cmpxchg_byte_func)
124 DEFINE_STUB_CMPXCHG(4, jint, os::atomic_cmpxchg_func)
125 DEFINE_STUB_CMPXCHG(8, jlong, os::atomic_cmpxchg_long_func)
126
127 #undef DEFINE_STUB_CMPXCHG
128
129 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
130
131 #else // !AMD64
132
133 inline jint Atomic::add (jint add_value, volatile jint* dest) {
134 __asm {
135 mov edx, dest;
136 mov eax, add_value;
137 mov ecx, eax;
138 lock xadd dword ptr [edx], eax;
139 add eax, ecx;
140 }
141 }
142
143 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
144 return (intptr_t)add((jint)add_value, (volatile jint*)dest);
145 }
146
147 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
148 return (void*)add((jint)add_value, (volatile jint*)dest);
149 }
150
151 inline void Atomic::inc (volatile jint* dest) {
152 // alternative for InterlockedIncrement
153 __asm {
154 mov edx, dest;
155 lock add dword ptr [edx], 1;
156 }
157 }
158
159 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
160 inc((volatile jint*)dest);
161 }
162
163 inline void Atomic::inc_ptr(volatile void* dest) {
164 inc((volatile jint*)dest);
165 }
166
167 inline void Atomic::dec (volatile jint* dest) {
168 // alternative for InterlockedDecrement
169 __asm {
170 mov edx, dest;
171 lock sub dword ptr [edx], 1;
172 }
173 }
174
175 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
176 dec((volatile jint*)dest);
177 }
178
179 inline void Atomic::dec_ptr(volatile void* dest) {
180 dec((volatile jint*)dest);
181 }
182
183 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
184 // alternative for InterlockedExchange
185 __asm {
186 mov eax, exchange_value;
187 mov ecx, dest;
188 xchg eax, dword ptr [ecx];
189 }
190 }
191
192 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
193 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
194 }
195
196 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
197 return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
198 }
199
200 template<>
201 template<typename T>
202 inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value,
203 T volatile* dest,
204 T compare_value,
205 cmpxchg_memory_order order) const {
206 STATIC_ASSERT(1 == sizeof(T));
207 // alternative for InterlockedCompareExchange
208 __asm {
209 mov edx, dest
210 mov cl, exchange_value
211 mov al, compare_value
212 lock cmpxchg byte ptr [edx], cl
213 }
214 }
215
216 template<>
217 template<typename T>
218 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
219 T volatile* dest,
220 T compare_value,
221 cmpxchg_memory_order order) const {
222 STATIC_ASSERT(4 == sizeof(T));
223 // alternative for InterlockedCompareExchange
224 __asm {
225 mov edx, dest
226 mov ecx, exchange_value
227 mov eax, compare_value
228 lock cmpxchg dword ptr [edx], ecx
229 }
230 }
231
232 template<>
233 template<typename T>
234 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
235 T volatile* dest,
236 T compare_value,
237 cmpxchg_memory_order order) const {
238 STATIC_ASSERT(8 == sizeof(T));
239 jint ex_lo = (jint)exchange_value;
240 jint ex_hi = *( ((jint*)&exchange_value) + 1 );
241 jint cmp_lo = (jint)compare_value;
242 jint cmp_hi = *( ((jint*)&compare_value) + 1 );
243 __asm {
244 push ebx
245 push edi
246 mov eax, cmp_lo
247 mov edx, cmp_hi
248 mov edi, dest
249 mov ebx, ex_lo
250 mov ecx, ex_hi
251 lock cmpxchg8b qword ptr [edi]
252 pop edi
253 pop ebx
254 }
255 }
256
257 inline jlong Atomic::load(const volatile jlong* src) {
258 volatile jlong dest;
259 volatile jlong* pdest = &dest;
260 __asm {
261 mov eax, src
262 fild qword ptr [eax]
263 mov eax, pdest
264 fistp qword ptr [eax]
265 }
266 return dest;
267 }
268
269 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
270 volatile jlong* src = &store_value;
271 __asm {
272 mov eax, src
273 fild qword ptr [eax]
274 mov eax, dest
275 fistp qword ptr [eax]
276 }
277 }
278
279 inline void Atomic::store(jlong store_value, jlong* dest) {
280 Atomic::store(store_value, (volatile jlong*)dest);
281 }
282
283 #endif // AMD64
284
285 #pragma warning(default: 4035) // Enables warnings reporting missing return statement
286
287 #endif // OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP