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) 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) const { 50 STATIC_ASSERT(4 == sizeof(T)); 51 __asm__ volatile ( "swap [%2],%0" 52 : "=r" (exchange_value) 53 : "0" (exchange_value), "r" (dest) 54 : "memory"); 55 return exchange_value; 56 } 57 58 template<> 59 template<typename T> 60 inline T Atomic::PlatformXchg<8>::operator()(T exchange_value, 61 T volatile* dest) const { 62 STATIC_ASSERT(8 == sizeof(T)); 63 T old_value = *dest; 64 while (true) { 65 T result = cmpxchg(exchange_value, dest, old_value); 66 if (result == old_value) break; 67 old_value = result; 68 } 69 return old_value; 70 } 71 72 // No direct support for cmpxchg of bytes; emulate using int. 73 template<> 74 struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {}; 75 76 template<> 77 template<typename T> 78 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value, 79 T volatile* dest, 80 T compare_value, 81 cmpxchg_memory_order order) const { 82 STATIC_ASSERT(4 == sizeof(T)); 83 T rv; 84 __asm__ volatile( 85 " cas [%2], %3, %0" 86 : "=r" (rv) 87 : "0" (exchange_value), "r" (dest), "r" (compare_value) 88 : "memory"); 89 return rv; 90 } 91 92 template<> 93 template<typename T> 94 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value, 95 T volatile* dest, 96 T compare_value, 97 cmpxchg_memory_order order) const { 98 STATIC_ASSERT(8 == sizeof(T)); 99 T rv; 100 __asm__ volatile( 101 " casx [%2], %3, %0" 102 : "=r" (rv) 103 : "0" (exchange_value), "r" (dest), "r" (compare_value) 104 : "memory"); 105 return rv; 106 } 107 108 #endif // OS_CPU_SOLARIS_SPARC_VM_ATOMIC_SOLARIS_SPARC_HPP