1 /*
   2  * Copyright (c) 1999, 2014, 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_BSD_X86_VM_ATOMIC_BSD_X86_INLINE_HPP
  26 #define OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_INLINE_HPP
  27 
  28 #include "runtime/atomic.hpp"
  29 #include "runtime/os.hpp"
  30 
  31 // Implementation of class atomic
  32 
  33 inline void Atomic::store    (jbyte    store_value, jbyte*    dest) { *dest = store_value; }
  34 inline void Atomic::store    (jshort   store_value, jshort*   dest) { *dest = store_value; }
  35 inline void Atomic::store    (jint     store_value, jint*     dest) { *dest = store_value; }
  36 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
  37 inline void Atomic::store_ptr(void*    store_value, void*     dest) { *(void**)dest = store_value; }
  38 
  39 inline void Atomic::store    (jbyte    store_value, volatile jbyte*    dest) { *dest = store_value; }
  40 inline void Atomic::store    (jshort   store_value, volatile jshort*   dest) { *dest = store_value; }
  41 inline void Atomic::store    (jint     store_value, volatile jint*     dest) { *dest = store_value; }
  42 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
  43 inline void Atomic::store_ptr(void*    store_value, volatile void*     dest) { *(void* volatile *)dest = store_value; }
  44 
  45 
  46 // Adding a lock prefix to an instruction on MP machine
  47 #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: "
  48 
  49 inline jint     Atomic::add    (jint     add_value, volatile jint*     dest) {
  50   jint addend = add_value;
  51   int mp = os::is_MP();
  52   __asm__ volatile (  LOCK_IF_MP(%3) "xaddl %0,(%2)"
  53                     : "=r" (addend)
  54                     : "0" (addend), "r" (dest), "r" (mp)
  55                     : "cc", "memory");
  56   return addend + add_value;
  57 }
  58 
  59 inline void Atomic::inc    (volatile jint*     dest) {
  60   int mp = os::is_MP();
  61   __asm__ volatile (LOCK_IF_MP(%1) "addl $1,(%0)" :
  62                     : "r" (dest), "r" (mp) : "cc", "memory");
  63 }
  64 
  65 inline void Atomic::inc_ptr(volatile void*     dest) {
  66   inc_ptr((volatile intptr_t*)dest);
  67 }
  68 
  69 inline void Atomic::dec    (volatile jint*     dest) {
  70   int mp = os::is_MP();
  71   __asm__ volatile (LOCK_IF_MP(%1) "subl $1,(%0)" :
  72                     : "r" (dest), "r" (mp) : "cc", "memory");
  73 }
  74 
  75 inline void Atomic::dec_ptr(volatile void*     dest) {
  76   dec_ptr((volatile intptr_t*)dest);
  77 }
  78 
  79 inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {
  80   __asm__ volatile (  "xchgl (%2),%0"
  81                     : "=r" (exchange_value)
  82                     : "0" (exchange_value), "r" (dest)
  83                     : "memory");
  84   return exchange_value;
  85 }
  86 
  87 inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {
  88   return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
  89 }
  90 
  91 inline jbyte    AtomicPlatform::cmpxchg(jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value) {
  92   int mp = os::is_MP();
  93   __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgb %1,(%3)"
  94                     : "=a" (exchange_value)
  95                     : "q" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
  96                     : "cc", "memory");
  97   return exchange_value;
  98 }
  99 
 100 inline jint     Atomic::cmpxchg        (jint     exchange_value, volatile jint*     dest, jint     compare_value) {
 101   int mp = os::is_MP();
 102   __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"
 103                     : "=a" (exchange_value)
 104                     : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
 105                     : "cc", "memory");
 106   return exchange_value;
 107 }
 108 
 109 #ifdef AMD64
 110 inline void Atomic::store    (jlong    store_value, jlong*    dest) { *dest = store_value; }
 111 inline void Atomic::store    (jlong    store_value, volatile jlong*    dest) { *dest = store_value; }
 112 
 113 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
 114   intptr_t addend = add_value;
 115   bool mp = os::is_MP();
 116   __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)"
 117                         : "=r" (addend)
 118                         : "0" (addend), "r" (dest), "r" (mp)
 119                         : "cc", "memory");
 120   return addend + add_value;
 121 }
 122 
 123 inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
 124   return (void*)add_ptr(add_value, (volatile intptr_t*)dest);
 125 }
 126 
 127 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
 128   bool mp = os::is_MP();
 129   __asm__ __volatile__ (LOCK_IF_MP(%1) "addq $1,(%0)"
 130                         :
 131                         : "r" (dest), "r" (mp)
 132                         : "cc", "memory");
 133 }
 134 
 135 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
 136   bool mp = os::is_MP();
 137   __asm__ __volatile__ (LOCK_IF_MP(%1) "subq $1,(%0)"
 138                         :
 139                         : "r" (dest), "r" (mp)
 140                         : "cc", "memory");
 141 }
 142 
 143 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
 144   __asm__ __volatile__ ("xchgq (%2),%0"
 145                         : "=r" (exchange_value)
 146                         : "0" (exchange_value), "r" (dest)
 147                         : "memory");
 148   return exchange_value;
 149 }
 150 
 151 inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value) {
 152   bool mp = os::is_MP();
 153   __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)"
 154                         : "=a" (exchange_value)
 155                         : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
 156                         : "cc", "memory");
 157   return exchange_value;
 158 }
 159 
 160 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
 161   return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
 162 }
 163 
 164 inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value) {
 165   return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
 166 }
 167 
 168 inline jlong Atomic::load(volatile jlong* src) { return *src; }
 169 
 170 #else // !AMD64
 171 
 172 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
 173   return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest);
 174 }
 175 
 176 inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
 177   return (void*)Atomic::add((jint)add_value, (volatile jint*)dest);
 178 }
 179 
 180 
 181 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
 182   inc((volatile jint*)dest);
 183 }
 184 
 185 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
 186   dec((volatile jint*)dest);
 187 }
 188 
 189 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
 190   return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
 191 }
 192 
 193 extern "C" {
 194   // defined in bsd_x86.s
 195   jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
 196   void _Atomic_move_long(volatile jlong* src, volatile jlong* dst);
 197 }
 198 
 199 inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value) {
 200   return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP());
 201 }
 202 
 203 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
 204   return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
 205 }
 206 
 207 inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value) {
 208   return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
 209 }
 210 
 211 inline jlong Atomic::load(volatile jlong* src) {
 212   volatile jlong dest;
 213   _Atomic_move_long(src, &dest);
 214   return dest;
 215 }
 216 
 217 inline void Atomic::store(jlong store_value, jlong* dest) {
 218   _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
 219 }
 220 
 221 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
 222   _Atomic_move_long((volatile jlong*)&store_value, dest);
 223 }
 224 
 225 #endif // AMD64
 226 
 227 #endif // OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_INLINE_HPP