1 /* 2 * Copyright (c) 1999, 2018, 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 // Implement ADD using a CAS loop. 31 template<size_t byte_size> 32 struct Atomic::PlatformAdd { 33 template<typename I, typename D> 34 inline D operator()(I add_value, D volatile* dest, atomic_memory_order order) const { 35 D old_value = *dest; 36 while (true) { 37 D new_value = old_value + add_value; 38 D result = cmpxchg(new_value, dest, old_value); 39 if (result == old_value) break; 40 old_value = result; 41 } 42 return old_value + add_value; 43 } 44 }; 45 46 template<> 47 template<typename T> 48 inline T Atomic::PlatformXchg<4>::operator()(T exchange_value, 49 T volatile* dest, 50 atomic_memory_order order) const { 51 STATIC_ASSERT(4 == sizeof(T)); 52 __asm__ volatile ( "swap [%2],%0" 53 : "=r" (exchange_value) 54 : "0" (exchange_value), "r" (dest) 55 : "memory"); 56 return exchange_value; 57 } 58 59 template<> 60 template<typename T> 61 inline T Atomic::PlatformXchg<8>::operator()(T exchange_value, 62 T volatile* dest, 63 atomic_memory_order order) const { 64 STATIC_ASSERT(8 == sizeof(T)); 65 T old_value = *dest; 66 while (true) { 67 T result = cmpxchg(exchange_value, dest, old_value); 68 if (result == old_value) break; 69 old_value = result; 70 } 71 return old_value; 72 } 73 74 // No direct support for cmpxchg of bytes; emulate using int. 75 template<> 76 struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {}; 77 78 template<> 79 template<typename T> 80 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value, 81 T volatile* dest, 82 T compare_value, 83 atomic_memory_order order) const { 84 STATIC_ASSERT(4 == sizeof(T)); 85 T rv; 86 __asm__ volatile( 87 " cas [%2], %3, %0" 88 : "=r" (rv) 89 : "0" (exchange_value), "r" (dest), "r" (compare_value) 90 : "memory"); 91 return rv; 92 } 93 94 template<> 95 template<typename T> 96 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value, 97 T volatile* dest, 98 T compare_value, 99 atomic_memory_order order) const { 100 STATIC_ASSERT(8 == sizeof(T)); 101 T rv; 102 __asm__ volatile( 103 " casx [%2], %3, %0" 104 : "=r" (rv) 105 : "0" (exchange_value), "r" (dest), "r" (compare_value) 106 : "memory"); 107 return rv; 108 } 109 110 #endif // OS_CPU_SOLARIS_SPARC_VM_ATOMIC_SOLARIS_SPARC_HPP