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_SOLARIS_SPARC_VM_ATOMIC_SOLARIS_SPARC_HPP
26 #define OS_CPU_SOLARIS_SPARC_VM_ATOMIC_SOLARIS_SPARC_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_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
34 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
35
36 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
37 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
38 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
39 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
40 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
41
42 inline void Atomic::inc (volatile jint* dest) { (void)add (1, dest); }
43 inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); }
44 inline void Atomic::inc_ptr(volatile void* dest) { (void)add_ptr(1, dest); }
45
46 inline void Atomic::dec (volatile jint* dest) { (void)add (-1, dest); }
47 inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); }
48 inline void Atomic::dec_ptr(volatile void* dest) { (void)add_ptr(-1, dest); }
49
50
51 inline void Atomic::store(jlong store_value, jlong* dest) { *dest = store_value; }
52 inline void Atomic::store(jlong store_value, volatile jlong* dest) { *dest = store_value; }
53 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
54
55
56 // This is the interface to the atomic instructions in solaris_sparc.il.
57 // It's very messy because we need to support v8 and these instructions
58 // are illegal there. When sparc v8 is dropped, we can drop out lots of
59 // this code. Also compiler2 does not support v8 so the conditional code
60 // omits the instruction set check.
61
62 extern "C" jint _Atomic_swap32(jint exchange_value, volatile jint* dest);
63 extern "C" intptr_t _Atomic_swap64(intptr_t exchange_value, volatile intptr_t* dest);
64
65 // Implement ADD using a CAS loop.
66 template<size_t byte_size>
67 struct Atomic::PlatformAdd VALUE_OBJ_CLASS_SPEC {
68 template<typename I, typename D>
69 inline D operator()(I add_value, D volatile* dest) const {
70 D old_value = *dest;
71 while (true) {
72 D new_value = old_value + add_value;
73 D result = cmpxchg(new_value, dest, old_value);
74 if (result == old_value) break;
75 old_value = result;
76 }
77 return old_value + add_value;
78 }
79 };
80
81 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
82 return _Atomic_swap32(exchange_value, dest);
83 }
84
85 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
86 return _Atomic_swap64(exchange_value, dest);
87 }
88
89 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
90 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
91 }
92
93 // No direct support for cmpxchg of bytes; emulate using int.
94 template<>
95 struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {};
96
97 template<>
98 template<typename T>
99 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
100 T volatile* dest,
101 T compare_value,
102 cmpxchg_memory_order order) const {
103 STATIC_ASSERT(4 == sizeof(T));
104 T rv;
105 __asm__ volatile(
106 " cas [%2], %3, %0"
107 : "=r" (rv)
108 : "0" (exchange_value), "r" (dest), "r" (compare_value)
109 : "memory");
110 return rv;
111 }
112
113 template<>
114 template<typename T>
115 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
116 T volatile* dest,
117 T compare_value,
118 cmpxchg_memory_order order) const {
119 STATIC_ASSERT(8 == sizeof(T));
120 T rv;
121 __asm__ volatile(
122 " casx [%2], %3, %0"
123 : "=r" (rv)
124 : "0" (exchange_value), "r" (dest), "r" (compare_value)
125 : "memory");
126 return rv;
127 }
128
129 #endif // OS_CPU_SOLARIS_SPARC_VM_ATOMIC_SOLARIS_SPARC_HPP