1 /*
2 * Copyright (c) 1999, 2008, 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 // Implementation of class atomic
26
27 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
28 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
29 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
30 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
31 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
32 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
33
34 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
35 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
36 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
37 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
38 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
39 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
40
41 inline void Atomic::inc (volatile jint* dest) { (void)add (1, dest); }
42 inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); }
43 inline void Atomic::inc_ptr(volatile void* dest) { (void)add_ptr(1, dest); }
44
45 inline void Atomic::dec (volatile jint* dest) { (void)add (-1, dest); }
46 inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); }
47 inline void Atomic::dec_ptr(volatile void* dest) { (void)add_ptr(-1, dest); }
48
49 inline jint Atomic::add (jint add_value, volatile jint* dest) {
50 intptr_t rv;
51 __asm__ volatile(
52 "1: \n\t"
53 " ld [%2], %%o2\n\t"
54 " add %1, %%o2, %%o3\n\t"
55 " cas [%2], %%o2, %%o3\n\t"
56 " cmp %%o2, %%o3\n\t"
57 " bne 1b\n\t"
58 " nop\n\t"
59 " add %1, %%o2, %0\n\t"
60 : "=r" (rv)
61 : "r" (add_value), "r" (dest)
62 : "memory", "o2", "o3");
63 return rv;
64 }
65
66 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
67 intptr_t rv;
68 #ifdef _LP64
69 __asm__ volatile(
70 "1: \n\t"
71 " ldx [%2], %%o2\n\t"
72 " add %0, %%o2, %%o3\n\t"
73 " casx [%2], %%o2, %%o3\n\t"
74 " cmp %%o2, %%o3\n\t"
75 " bne %%xcc, 1b\n\t"
76 " nop\n\t"
77 " add %0, %%o2, %0\n\t"
78 : "=r" (rv)
79 : "r" (add_value), "r" (dest)
80 : "memory", "o2", "o3");
81 #else
82 __asm__ volatile(
83 "1: \n\t"
84 " ld [%2], %%o2\n\t"
85 " add %1, %%o2, %%o3\n\t"
86 " cas [%2], %%o2, %%o3\n\t"
87 " cmp %%o2, %%o3\n\t"
88 " bne 1b\n\t"
89 " nop\n\t"
90 " add %1, %%o2, %0\n\t"
91 : "=r" (rv)
92 : "r" (add_value), "r" (dest)
93 : "memory", "o2", "o3");
94 #endif // _LP64
95 return rv;
96 }
97
98 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
99 return (void*)add_ptr((intptr_t)add_value, (volatile intptr_t*)dest);
100 }
101
102
103 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
104 intptr_t rv = exchange_value;
105 __asm__ volatile(
106 " swap [%2],%1\n\t"
107 : "=r" (rv)
108 : "0" (exchange_value) /* we use same register as for return value */, "r" (dest)
109 : "memory");
110 return rv;
111 }
112
113 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
114 intptr_t rv = exchange_value;
115 #ifdef _LP64
116 __asm__ volatile(
117 "1:\n\t"
118 " mov %1, %%o3\n\t"
119 " ldx [%2], %%o2\n\t"
120 " casx [%2], %%o2, %%o3\n\t"
121 " cmp %%o2, %%o3\n\t"
122 " bne %%xcc, 1b\n\t"
123 " nop\n\t"
124 " mov %%o2, %0\n\t"
125 : "=r" (rv)
126 : "r" (exchange_value), "r" (dest)
127 : "memory", "o2", "o3");
128 #else
129 __asm__ volatile(
130 "swap [%2],%1\n\t"
131 : "=r" (rv)
132 : "0" (exchange_value) /* we use same register as for return value */, "r" (dest)
133 : "memory");
134 #endif // _LP64
135 return rv;
136 }
137
138 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
139 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
140 }
141
142
143 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
144 jint rv;
145 __asm__ volatile(
146 " cas [%2], %3, %0"
147 : "=r" (rv)
148 : "0" (exchange_value), "r" (dest), "r" (compare_value)
149 : "memory");
150 return rv;
151 }
152
153 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
154 #ifdef _LP64
155 jlong rv;
156 __asm__ volatile(
157 " casx [%2], %3, %0"
158 : "=r" (rv)
159 : "0" (exchange_value), "r" (dest), "r" (compare_value)
160 : "memory");
161 return rv;
162 #else
163 assert(VM_Version::v9_instructions_work(), "cas only supported on v9");
164 volatile jlong_accessor evl, cvl, rv;
165 evl.long_value = exchange_value;
166 cvl.long_value = compare_value;
167
168 __asm__ volatile(
169 " sllx %2, 32, %2\n\t"
170 " srl %3, 0, %3\n\t"
171 " or %2, %3, %2\n\t"
172 " sllx %5, 32, %5\n\t"
173 " srl %6, 0, %6\n\t"
174 " or %5, %6, %5\n\t"
175 " casx [%4], %5, %2\n\t"
176 " srl %2, 0, %1\n\t"
177 " srlx %2, 32, %0\n\t"
178 : "=r" (rv.words[0]), "=r" (rv.words[1])
179 : "r" (evl.words[0]), "r" (evl.words[1]), "r" (dest), "r" (cvl.words[0]), "r" (cvl.words[1])
180 : "memory");
181
182 return rv.long_value;
183 #endif
184 }
185
186 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
187 intptr_t rv;
188 #ifdef _LP64
189 __asm__ volatile(
190 " casx [%2], %3, %0"
191 : "=r" (rv)
192 : "0" (exchange_value), "r" (dest), "r" (compare_value)
193 : "memory");
194 #else
195 __asm__ volatile(
196 " cas [%2], %3, %0"
197 : "=r" (rv)
198 : "0" (exchange_value), "r" (dest), "r" (compare_value)
199 : "memory");
200 #endif // _LP64
201 return rv;
202 }
203
204 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
205 return (void*)cmpxchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest, (intptr_t)compare_value);
206 }