1 /*
2 * Copyright (c) 1999, 2009, 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.
22 *
23 */
24
25 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
26 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
27 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
28
29
30 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
31 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
32
33 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
34 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
35 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
36 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
37 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
38
39 inline void Atomic::inc (volatile jint* dest) { (void)add (1, dest); }
40 inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); }
41 inline void Atomic::inc_ptr(volatile void* dest) { (void)add_ptr(1, dest); }
42
43 inline void Atomic::dec (volatile jint* dest) { (void)add (-1, dest); }
44 inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); }
45 inline void Atomic::dec_ptr(volatile void* dest) { (void)add_ptr(-1, dest); }
46
47 // For Sun Studio - implementation is in solaris_x86_[32/64].il.
48 // For gcc - implementation is just below.
49
50 // The lock prefix can be omitted for certain instructions on uniprocessors; to
51 // facilitate this, os::is_MP() is passed as an additional argument. 64-bit
52 // processors are assumed to be multi-threaded and/or multi-core, so the extra
53 // argument is unnecessary.
54 #ifndef _LP64
55 #define IS_MP_DECL() , int is_mp
56 #define IS_MP_ARG() , (int) os::is_MP()
57 #else
58 #define IS_MP_DECL()
59 #define IS_MP_ARG()
60 #endif // _LP64
61
62 extern "C" {
63 jint _Atomic_add(jint add_value, volatile jint* dest IS_MP_DECL());
64 jint _Atomic_xchg(jint exchange_value, volatile jint* dest);
65 jint _Atomic_cmpxchg(jint exchange_value, volatile jint* dest,
66 jint compare_value IS_MP_DECL());
67 jlong _Atomic_cmpxchg_long(jlong exchange_value, volatile jlong* dest,
68 jlong compare_value IS_MP_DECL());
69 }
70
71 inline jint Atomic::add (jint add_value, volatile jint* dest) {
72 return _Atomic_add(add_value, dest IS_MP_ARG());
73 }
74
75 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
76 return _Atomic_xchg(exchange_value, dest);
77 }
78
79 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
80 return _Atomic_cmpxchg(exchange_value, dest, compare_value IS_MP_ARG());
81 }
82
83 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
84 return _Atomic_cmpxchg_long(exchange_value, dest, compare_value IS_MP_ARG());
85 }
86
87
88 #ifdef AMD64
89 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
90 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
91 extern "C" jlong _Atomic_add_long(jlong add_value, volatile jlong* dest);
92 extern "C" jlong _Atomic_xchg_long(jlong exchange_value, volatile jlong* dest);
93
94 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
95 return (intptr_t)_Atomic_add_long((jlong)add_value, (volatile jlong*)dest);
96 }
97
98 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
99 return (void*)_Atomic_add_long((jlong)add_value, (volatile jlong*)dest);
100 }
101
102 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
103 return (intptr_t)_Atomic_xchg_long((jlong)exchange_value, (volatile jlong*)dest);
104 }
105
106 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
107 return (void*)_Atomic_xchg_long((jlong)exchange_value, (volatile jlong*)dest);
108 }
109
110 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
111 return (intptr_t)_Atomic_cmpxchg_long((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
112 }
113
114 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
115 return (void*)_Atomic_cmpxchg_long((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
116 }
117
118 inline jlong Atomic::load(volatile jlong* src) { return *src; }
119
120 #else // !AMD64
121
122 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
123 return (intptr_t)add((jint)add_value, (volatile jint*)dest);
124 }
125
126 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
127 return (void*)add((jint)add_value, (volatile jint*)dest);
128 }
129
130 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
131 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
132 }
133
134 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
135 return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
136 }
137
138 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
139 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
140 }
141
142 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
143 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
144 }
145
146 extern "C" void _Atomic_load_long(volatile jlong* src, volatile jlong* dst);
147
148 inline jlong Atomic::load(volatile jlong* src) {
149 volatile jlong dest;
150 _Atomic_load_long(src, &dest);
151 return dest;
152 }
153
154 #endif // AMD64
155
156 #ifdef _GNU_SOURCE
157 // Add a lock prefix to an instruction on an MP machine
158 #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: "
159
160 extern "C" {
161 inline jint _Atomic_add(jint add_value, volatile jint* dest, int mp) {
162 jint addend = add_value;
163 __asm__ volatile ( LOCK_IF_MP(%3) "xaddl %0,(%2)"
164 : "=r" (addend)
165 : "0" (addend), "r" (dest), "r" (mp)
166 : "cc", "memory");
167 return addend + add_value;
168 }
169
170 #ifdef AMD64
171 inline jlong _Atomic_add_long(jlong add_value, volatile jlong* dest, int mp) {
172 intptr_t addend = add_value;
173 __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)"
174 : "=r" (addend)
175 : "0" (addend), "r" (dest), "r" (mp)
176 : "cc", "memory");
177 return addend + add_value;
178 }
179
180 inline jlong _Atomic_xchg_long(jlong exchange_value, volatile jlong* dest) {
181 __asm__ __volatile__ ("xchgq (%2),%0"
182 : "=r" (exchange_value)
183 : "0" (exchange_value), "r" (dest)
184 : "memory");
185 return exchange_value;
186 }
187
188 #endif // AMD64
189
190 inline jint _Atomic_xchg(jint exchange_value, volatile jint* dest) {
191 __asm__ __volatile__ ("xchgl (%2),%0"
192 : "=r" (exchange_value)
193 : "0" (exchange_value), "r" (dest)
194 : "memory");
195 return exchange_value;
196 }
197
198 inline jint _Atomic_cmpxchg(jint exchange_value, volatile jint* dest, jint compare_value, int mp) {
199 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"
200 : "=a" (exchange_value)
201 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
202 : "cc", "memory");
203 return exchange_value;
204 }
205
206 // This is the interface to the atomic instruction in solaris_i486.s.
207 jlong _Atomic_cmpxchg_long_gcc(jlong exchange_value, volatile jlong* dest, jlong compare_value, int mp);
208
209 inline jlong _Atomic_cmpxchg_long(jlong exchange_value, volatile jlong* dest, jlong compare_value, int mp) {
210 #ifdef AMD64
211 __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)"
212 : "=a" (exchange_value)
213 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
214 : "cc", "memory");
215 return exchange_value;
216 #else
217 return _Atomic_cmpxchg_long_gcc(exchange_value, dest, compare_value, os::is_MP());
218
219 #if 0
220 // The code below does not work presumably because of the bug in gcc
221 // The error message says:
222 // can't find a register in class BREG while reloading asm
223 // However I want to save this code and later replace _Atomic_cmpxchg_long_gcc
224 // with such inline asm code:
225
226 volatile jlong_accessor evl, cvl, rv;
227 evl.long_value = exchange_value;
228 cvl.long_value = compare_value;
229 int mp = os::is_MP();
230
231 __asm__ volatile ("cmp $0, %%esi\n\t"
232 "je 1f \n\t"
233 "lock\n\t"
234 "1: cmpxchg8b (%%edi)\n\t"
235 : "=a"(cvl.words[0]), "=d"(cvl.words[1])
236 : "a"(cvl.words[0]), "d"(cvl.words[1]),
237 "b"(evl.words[0]), "c"(evl.words[1]),
238 "D"(dest), "S"(mp)
239 : "cc", "memory");
240 return cvl.long_value;
241 #endif // if 0
242 #endif // AMD64
243 }
244 }
245 #undef LOCK_IF_MP
246
247 #endif // _GNU_SOURCE