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.
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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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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
30inline void Atomic::store    (jbyte    store_value, jbyte*    dest) { *dest = store_value; }
31inline void Atomic::store    (jshort   store_value, jshort*   dest) { *dest = store_value; }
32inline void Atomic::store    (jint     store_value, jint*     dest) { *dest = store_value; }
33inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
34inline void Atomic::store_ptr(void*    store_value, void*     dest) { *(void**)dest = store_value; }
35
36inline void Atomic::store    (jbyte    store_value, volatile jbyte*    dest) { *dest = store_value; }
37inline void Atomic::store    (jshort   store_value, volatile jshort*   dest) { *dest = store_value; }
38inline void Atomic::store    (jint     store_value, volatile jint*     dest) { *dest = store_value; }
39inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
40inline void Atomic::store_ptr(void*    store_value, volatile void*     dest) { *(void* volatile *)dest = store_value; }
41
42inline void Atomic::inc    (volatile jint*     dest) { (void)add    (1, dest); }
43inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); }
44inline void Atomic::inc_ptr(volatile void*     dest) { (void)add_ptr(1, dest); }
45
46inline void Atomic::dec    (volatile jint*     dest) { (void)add    (-1, dest); }
47inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); }
48inline void Atomic::dec_ptr(volatile void*     dest) { (void)add_ptr(-1, dest); }
49
50
51inline void Atomic::store(jlong store_value, jlong* dest) { *dest = store_value; }
52inline void Atomic::store(jlong store_value, volatile jlong* dest) { *dest = store_value; }
53inline 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
62extern "C" jint     _Atomic_swap32(jint     exchange_value, volatile jint*     dest);
63extern "C" intptr_t _Atomic_swap64(intptr_t exchange_value, volatile intptr_t* dest);
64
65// Implement ADD using a CAS loop.
66template<size_t byte_size>
67struct 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
81inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {
82  return _Atomic_swap32(exchange_value, dest);
83}
84
85inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
86  return _Atomic_swap64(exchange_value, dest);
87}
88
89inline 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.
94template<>
95struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {};
96
97template<>
98template<typename T>
99inline 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
113template<>
114template<typename T>
115inline 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
130