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.
22 *
23 */
24
25 #ifndef OS_CPU_LINUX_SPARC_VM_ATOMIC_LINUX_SPARC_INLINE_HPP
26 #define OS_CPU_LINUX_SPARC_VM_ATOMIC_LINUX_SPARC_INLINE_HPP
27
28 // Implementation of class atomic
29
30 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
31 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
32 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
33 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
34 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
35 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
36
37 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
38 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
39 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
40 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
41 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
42 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
43
44 inline void Atomic::inc (volatile jint* dest) { (void)add (1, dest); }
45 inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); }
46 inline void Atomic::inc_ptr(volatile void* dest) { (void)add_ptr(1, dest); }
47
48 inline void Atomic::dec (volatile jint* dest) { (void)add (-1, dest); }
49 inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); }
50 inline void Atomic::dec_ptr(volatile void* dest) { (void)add_ptr(-1, dest); }
51
52 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
53
54 template<size_t byte_size>
55 struct Atomic::PlatformAdd
56 : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> >
57 {
58 template<typename I, typename D>
59 D add_and_fetch(I add_value, D volatile* dest) const;
60 };
61
62 template<>
63 template<typename I, typename D>
64 inline D Atomic::PlatformAdd<4>::add_and_fetch(I add_value, D volatile* dest) const {
65 STATIC_CAST(4 == sizeof(I));
66 STATIC_CAST(4 == sizeof(D));
67
68 D rv;
69 __asm__ volatile(
70 "1: \n\t"
71 " ld [%2], %%o2\n\t"
72 " add %1, %%o2, %%o3\n\t"
73 " cas [%2], %%o2, %%o3\n\t"
74 " cmp %%o2, %%o3\n\t"
75 " bne 1b\n\t"
76 " nop\n\t"
77 " add %1, %%o2, %0\n\t"
78 : "=r" (rv)
79 : "r" (add_value), "r" (dest)
80 : "memory", "o2", "o3");
81 return rv;
82 }
83
84 template<typename I, typename D>
85 inline D Atomic::PlatformAdd<8>::add_and_fetch(I add_value, D volatile* dest) const {
86 STATIC_CAST(8 == sizeof(I));
87 STATIC_CAST(8 == sizeof(D));
88
89 D rv;
90 __asm__ volatile(
91 "1: \n\t"
92 " ldx [%2], %%o2\n\t"
93 " add %1, %%o2, %%o3\n\t"
94 " casx [%2], %%o2, %%o3\n\t"
95 " cmp %%o2, %%o3\n\t"
96 " bne %%xcc, 1b\n\t"
97 " nop\n\t"
98 " add %1, %%o2, %0\n\t"
99 : "=r" (rv)
100 : "r" (add_value), "r" (dest)
101 : "memory", "o2", "o3");
102 return rv;
103 }
104
105
106 template<>
107 struct Atomic::PlatformAdd<2>: Atomic::AddShortUsingInt {};
108
109 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
110 intptr_t rv = exchange_value;
111 __asm__ volatile(
112 " swap [%2],%1\n\t"
113 : "=r" (rv)
114 : "0" (exchange_value) /* we use same register as for return value */, "r" (dest)
115 : "memory");
116 return rv;
117 }
118
119 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
120 intptr_t rv = exchange_value;
121 __asm__ volatile(
122 "1:\n\t"
123 " mov %1, %%o3\n\t"
124 " ldx [%2], %%o2\n\t"
125 " casx [%2], %%o2, %%o3\n\t"
126 " cmp %%o2, %%o3\n\t"
127 " bne %%xcc, 1b\n\t"
128 " nop\n\t"
129 " mov %%o2, %0\n\t"
130 : "=r" (rv)
131 : "r" (exchange_value), "r" (dest)
132 : "memory", "o2", "o3");
133 return rv;
134 }
135
136 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
137 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
138 }
139
140 // No direct support for cmpxchg of bytes; emulate using int.
141 template<>
142 struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {};
143
144 template<>
145 template<typename T>
146 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
147 T volatile* dest,
148 T compare_value,
149 cmpxchg_memory_order order) const {
150 STATIC_ASSERT(4 == sizeof(T));
151 T rv;
152 __asm__ volatile(
153 " cas [%2], %3, %0"
154 : "=r" (rv)
155 : "0" (exchange_value), "r" (dest), "r" (compare_value)
156 : "memory");
157 return rv;
158 }
159
160 template<>
161 template<typename T>
162 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
163 T volatile* dest,
164 T compare_value,
165 cmpxchg_memory_order order) const {
166 STATIC_ASSERT(8 == sizeof(T));
167 T rv;
168 __asm__ volatile(
169 " casx [%2], %3, %0"
170 : "=r" (rv)
171 : "0" (exchange_value), "r" (dest), "r" (compare_value)
172 : "memory");
173 return rv;
174 }
175
176 #endif // OS_CPU_LINUX_SPARC_VM_ATOMIC_LINUX_SPARC_INLINE_HPP