atomic_linux_x86.hpp revision 13038:ae91ec8b554a 
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_X86_VM_ATOMIC_LINUX_X86_HPP
26#define OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP
27
28#include "runtime/os.hpp"
29
30// Implementation of class atomic
31
32inline void Atomic::store    (jbyte    store_value, jbyte*    dest) { *dest = store_value; }
33inline void Atomic::store    (jshort   store_value, jshort*   dest) { *dest = store_value; }
34inline void Atomic::store    (jint     store_value, jint*     dest) { *dest = store_value; }
35inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
36inline void Atomic::store_ptr(void*    store_value, void*     dest) { *(void**)dest = store_value; }
37
38inline void Atomic::store    (jbyte    store_value, volatile jbyte*    dest) { *dest = store_value; }
39inline void Atomic::store    (jshort   store_value, volatile jshort*   dest) { *dest = store_value; }
40inline void Atomic::store    (jint     store_value, volatile jint*     dest) { *dest = store_value; }
41inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
42inline void Atomic::store_ptr(void*    store_value, volatile void*     dest) { *(void* volatile *)dest = store_value; }
43
44
45inline jint     Atomic::add    (jint     add_value, volatile jint*     dest) {
46  jint addend = add_value;
47  __asm__ volatile (  "lock xaddl %0,(%2)"
48                    : "=r" (addend)
49                    : "0" (addend), "r" (dest)
50                    : "cc", "memory");
51  return addend + add_value;
52}
53
54inline void Atomic::inc    (volatile jint*     dest) {
55  __asm__ volatile (  "lock addl $1,(%0)" :
56                    : "r" (dest) : "cc", "memory");
57}
58
59inline void Atomic::inc_ptr(volatile void*     dest) {
60  inc_ptr((volatile intptr_t*)dest);
61}
62
63inline void Atomic::dec    (volatile jint*     dest) {
64  __asm__ volatile (  "lock subl $1,(%0)" :
65                    : "r" (dest) : "cc", "memory");
66}
67
68inline void Atomic::dec_ptr(volatile void*     dest) {
69  dec_ptr((volatile intptr_t*)dest);
70}
71
72inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {
73  __asm__ volatile (  "xchgl (%2),%0"
74                    : "=r" (exchange_value)
75                    : "0" (exchange_value), "r" (dest)
76                    : "memory");
77  return exchange_value;
78}
79
80inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {
81  return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
82}
83
84#define VM_HAS_SPECIALIZED_CMPXCHG_BYTE
85inline jbyte    Atomic::cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value, cmpxchg_memory_order order) {
86  __asm__ volatile ("lock cmpxchgb %1,(%3)"
87                    : "=a" (exchange_value)
88                    : "q" (exchange_value), "a" (compare_value), "r" (dest)
89                    : "cc", "memory");
90  return exchange_value;
91}
92
93inline jint     Atomic::cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value, cmpxchg_memory_order order) {
94  __asm__ volatile ("lock cmpxchgl %1,(%3)"
95                    : "=a" (exchange_value)
96                    : "r" (exchange_value), "a" (compare_value), "r" (dest)
97                    : "cc", "memory");
98  return exchange_value;
99}
100
101#ifdef AMD64
102inline void Atomic::store    (jlong    store_value, jlong*    dest) { *dest = store_value; }
103inline void Atomic::store    (jlong    store_value, volatile jlong*    dest) { *dest = store_value; }
104
105inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
106  intptr_t addend = add_value;
107  __asm__ __volatile__ ("lock xaddq %0,(%2)"
108                        : "=r" (addend)
109                        : "0" (addend), "r" (dest)
110                        : "cc", "memory");
111  return addend + add_value;
112}
113
114inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
115  return (void*)add_ptr(add_value, (volatile intptr_t*)dest);
116}
117
118inline void Atomic::inc_ptr(volatile intptr_t* dest) {
119  __asm__ __volatile__ ("lock addq $1,(%0)"
120                        :
121                        : "r" (dest)
122                        : "cc", "memory");
123}
124
125inline void Atomic::dec_ptr(volatile intptr_t* dest) {
126  __asm__ __volatile__ ("lock subq $1,(%0)"
127                        :
128                        : "r" (dest)
129                        : "cc", "memory");
130}
131
132inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
133  __asm__ __volatile__ ("xchgq (%2),%0"
134                        : "=r" (exchange_value)
135                        : "0" (exchange_value), "r" (dest)
136                        : "memory");
137  return exchange_value;
138}
139
140inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {
141  __asm__ __volatile__ ("lock cmpxchgq %1,(%3)"
142                        : "=a" (exchange_value)
143                        : "r" (exchange_value), "a" (compare_value), "r" (dest)
144                        : "cc", "memory");
145  return exchange_value;
146}
147
148inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
149  return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);
150}
151
152inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {
153  return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);
154}
155
156inline jlong Atomic::load(volatile jlong* src) { return *src; }
157
158#else // !AMD64
159
160inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
161  return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest);
162}
163
164inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
165  return (void*)Atomic::add((jint)add_value, (volatile jint*)dest);
166}
167
168
169inline void Atomic::inc_ptr(volatile intptr_t* dest) {
170  inc((volatile jint*)dest);
171}
172
173inline void Atomic::dec_ptr(volatile intptr_t* dest) {
174  dec((volatile jint*)dest);
175}
176
177inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
178  return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
179}
180
181extern "C" {
182  // defined in linux_x86.s
183  jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong);
184  void _Atomic_move_long(volatile jlong* src, volatile jlong* dst);
185}
186
187inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {
188  return _Atomic_cmpxchg_long(exchange_value, dest, compare_value);
189}
190
191inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
192  return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);
193}
194
195inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {
196  return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);
197}
198
199inline jlong Atomic::load(volatile jlong* src) {
200  volatile jlong dest;
201  _Atomic_move_long(src, &dest);
202  return dest;
203}
204
205inline void Atomic::store(jlong store_value, jlong* dest) {
206  _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
207}
208
209inline void Atomic::store(jlong store_value, volatile jlong* dest) {
210  _Atomic_move_long((volatile jlong*)&store_value, dest);
211}
212
213#endif // AMD64
214
215#endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP
216