1 /*
2 * Copyright (c) 1999, 2016, 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.
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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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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 // Adding a lock prefix to an instruction on MP machine
61 // VC++ doesn't like the lock prefix to be on a single line
62 // so we can't insert a label after the lock prefix.
63 // By emitting a lock prefix, we can define a label after it.
64 #define LOCK_IF_MP(mp) __asm cmp mp, 0 \
65 __asm je L0 \
66 __asm _emit 0xF0 \
67 __asm L0:
68
69 #ifdef AMD64
70 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
71 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
72
73 inline jint Atomic::add (jint add_value, volatile jint* dest) {
74 return (jint)(*os::atomic_add_func)(add_value, dest);
75 }
76
77 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
78 return (intptr_t)(*os::atomic_add_ptr_func)(add_value, dest);
79 }
80
81 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
82 return (void*)(*os::atomic_add_ptr_func)(add_value, (volatile intptr_t*)dest);
83 }
84
85 inline void Atomic::inc (volatile jint* dest) {
86 (void)add (1, dest);
87 }
88
89 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
90 (void)add_ptr(1, dest);
91 }
92
93 inline void Atomic::inc_ptr(volatile void* dest) {
94 (void)add_ptr(1, dest);
95 }
96
97 inline void Atomic::dec (volatile jint* dest) {
98 (void)add (-1, dest);
99 }
100
101 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
102 (void)add_ptr(-1, dest);
103 }
104
105 inline void Atomic::dec_ptr(volatile void* dest) {
106 (void)add_ptr(-1, dest);
107 }
108
109 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
110 return (jint)(*os::atomic_xchg_func)(exchange_value, dest);
111 }
112
113 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
114 return (intptr_t)(os::atomic_xchg_ptr_func)(exchange_value, dest);
115 }
116
117 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
118 return (void *)(os::atomic_xchg_ptr_func)((intptr_t)exchange_value, (volatile intptr_t*)dest);
119 }
120
121 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value, cmpxchg_memory_order order) {
122 return (*os::atomic_cmpxchg_func)(exchange_value, dest, compare_value);
123 }
124
125 #define VM_HAS_SPECIALIZED_CMPXCHG_BYTE
126 inline jbyte Atomic::cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value, cmpxchg_memory_order order) {
127 return (*os::atomic_cmpxchg_byte_func)(exchange_value, dest, compare_value);
128 }
129
130 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value, cmpxchg_memory_order order) {
131 return (*os::atomic_cmpxchg_long_func)(exchange_value, dest, compare_value);
132 }
133
134 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
135 return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);
136 }
137
138 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value, cmpxchg_memory_order order) {
139 return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);
140 }
141
142 inline jlong Atomic::load(volatile jlong* src) { return *src; }
143
144 #else // !AMD64
145
146 inline jint Atomic::add (jint add_value, volatile jint* dest) {
147 int mp = os::is_MP();
148 __asm {
149 mov edx, dest;
150 mov eax, add_value;
151 mov ecx, eax;
152 LOCK_IF_MP(mp)
153 xadd dword ptr [edx], eax;
154 add eax, ecx;
155 }
156 }
157
158 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
159 return (intptr_t)add((jint)add_value, (volatile jint*)dest);
160 }
161
162 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
163 return (void*)add((jint)add_value, (volatile jint*)dest);
164 }
165
166 inline void Atomic::inc (volatile jint* dest) {
167 // alternative for InterlockedIncrement
168 int mp = os::is_MP();
169 __asm {
170 mov edx, dest;
171 LOCK_IF_MP(mp)
172 add dword ptr [edx], 1;
173 }
174 }
175
176 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
177 inc((volatile jint*)dest);
178 }
179
180 inline void Atomic::inc_ptr(volatile void* dest) {
181 inc((volatile jint*)dest);
182 }
183
184 inline void Atomic::dec (volatile jint* dest) {
185 // alternative for InterlockedDecrement
186 int mp = os::is_MP();
187 __asm {
188 mov edx, dest;
189 LOCK_IF_MP(mp)
190 sub dword ptr [edx], 1;
191 }
192 }
193
194 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
195 dec((volatile jint*)dest);
196 }
197
198 inline void Atomic::dec_ptr(volatile void* dest) {
199 dec((volatile jint*)dest);
200 }
201
202 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
203 // alternative for InterlockedExchange
204 __asm {
205 mov eax, exchange_value;
206 mov ecx, dest;
207 xchg eax, dword ptr [ecx];
208 }
209 }
210
211 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
212 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
213 }
214
215 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
216 return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
217 }
218
219 #define VM_HAS_SPECIALIZED_CMPXCHG_BYTE
220 inline jbyte Atomic::cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value, cmpxchg_memory_order order) {
221 // alternative for InterlockedCompareExchange
222 int mp = os::is_MP();
223 __asm {
224 mov edx, dest
225 mov cl, exchange_value
226 mov al, compare_value
227 LOCK_IF_MP(mp)
228 cmpxchg byte ptr [edx], cl
229 }
230 }
231
232 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value, cmpxchg_memory_order order) {
233 // alternative for InterlockedCompareExchange
234 int mp = os::is_MP();
235 __asm {
236 mov edx, dest
237 mov ecx, exchange_value
238 mov eax, compare_value
239 LOCK_IF_MP(mp)
240 cmpxchg dword ptr [edx], ecx
241 }
242 }
243
244 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value, cmpxchg_memory_order order) {
245 int mp = os::is_MP();
246 jint ex_lo = (jint)exchange_value;
247 jint ex_hi = *( ((jint*)&exchange_value) + 1 );
248 jint cmp_lo = (jint)compare_value;
249 jint cmp_hi = *( ((jint*)&compare_value) + 1 );
250 __asm {
251 push ebx
252 push edi
253 mov eax, cmp_lo
254 mov edx, cmp_hi
255 mov edi, dest
256 mov ebx, ex_lo
257 mov ecx, ex_hi
258 LOCK_IF_MP(mp)
259 cmpxchg8b qword ptr [edi]
260 pop edi
261 pop ebx
262 }
263 }
264
265 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
266 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);
267 }
268
269 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value, cmpxchg_memory_order order) {
270 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);
271 }
272
273 inline jlong Atomic::load(volatile jlong* src) {
274 volatile jlong dest;
275 volatile jlong* pdest = &dest;
276 __asm {
277 mov eax, src
278 fild qword ptr [eax]
279 mov eax, pdest
280 fistp qword ptr [eax]
281 }
282 return dest;
283 }
284
285 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
286 volatile jlong* src = &store_value;
287 __asm {
288 mov eax, src
289 fild qword ptr [eax]
290 mov eax, dest
291 fistp qword ptr [eax]
292 }
293 }
294
295 inline void Atomic::store(jlong store_value, jlong* dest) {
296 Atomic::store(store_value, (volatile jlong*)dest);
297 }
298
299 #endif // AMD64
300
301 #pragma warning(default: 4035) // Enables warnings reporting missing return statement
302
303 #endif // OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP