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_LINUX_X86_VM_ATOMIC_LINUX_X86_INLINE_HPP

    26 #define OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_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 #define VM_HAS_SPECIALIZED_CMPXCHG_BYTE

    92 inline jbyte    Atomic::cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value, cmpxchg_memory_order order) {

    93   int mp = os::is_MP();

    94   __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgb %1,(%3)"

    95                     : "=a" (exchange_value)

    96                     : "q" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)

    97                     : "cc", "memory");

    98   return exchange_value;

    99 }

   100 

   101 inline jint     Atomic::cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value, cmpxchg_memory_order order) {

   102   int mp = os::is_MP();

   103   __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"

   104                     : "=a" (exchange_value)

   105                     : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)

   106                     : "cc", "memory");

   107   return exchange_value;

   108 }

   109 

   110 #ifdef AMD64

   111 inline void Atomic::store    (jlong    store_value, jlong*    dest) { *dest = store_value; }

   112 inline void Atomic::store    (jlong    store_value, volatile jlong*    dest) { *dest = store_value; }

   113 

   114 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {

   115   intptr_t addend = add_value;

   116   bool mp = os::is_MP();

   117   __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)"

   118                         : "=r" (addend)

   119                         : "0" (addend), "r" (dest), "r" (mp)

   120                         : "cc", "memory");

   121   return addend + add_value;

   122 }

   123 

   124 inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {

   125   return (void*)add_ptr(add_value, (volatile intptr_t*)dest);

   126 }

   127 

   128 inline void Atomic::inc_ptr(volatile intptr_t* dest) {

   129   bool mp = os::is_MP();

   130   __asm__ __volatile__ (LOCK_IF_MP(%1) "addq $1,(%0)"

   131                         :

   132                         : "r" (dest), "r" (mp)

   133                         : "cc", "memory");

   134 }

   135 

   136 inline void Atomic::dec_ptr(volatile intptr_t* dest) {

   137   bool mp = os::is_MP();

   138   __asm__ __volatile__ (LOCK_IF_MP(%1) "subq $1,(%0)"

   139                         :

   140                         : "r" (dest), "r" (mp)

   141                         : "cc", "memory");

   142 }

   143 

   144 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {

   145   __asm__ __volatile__ ("xchgq (%2),%0"

   146                         : "=r" (exchange_value)

   147                         : "0" (exchange_value), "r" (dest)

   148                         : "memory");

   149   return exchange_value;

   150 }

   151 

   152 inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {

   153   bool mp = os::is_MP();

   154   __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)"

   155                         : "=a" (exchange_value)

   156                         : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)

   157                         : "cc", "memory");

   158   return exchange_value;

   159 }

   160 

   161 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {

   162   return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);

   163 }

   164 

   165 inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {

   166   return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);

   167 }

   168 

   169 inline jlong Atomic::load(volatile jlong* src) { return *src; }

   170 

   171 #else // !AMD64

   172 

   173 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {

   174   return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest);

   175 }

   176 

   177 inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {

   178   return (void*)Atomic::add((jint)add_value, (volatile jint*)dest);

   179 }

   180 

   181 

   182 inline void Atomic::inc_ptr(volatile intptr_t* dest) {

   183   inc((volatile jint*)dest);

   184 }

   185 

   186 inline void Atomic::dec_ptr(volatile intptr_t* dest) {

   187   dec((volatile jint*)dest);

   188 }

   189 

   190 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {

   191   return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);

   192 }

   193 

   194 extern "C" {

   195   // defined in linux_x86.s

   196   jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);

   197   void _Atomic_move_long(volatile jlong* src, volatile jlong* dst);

   198 }

   199 

   200 inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {

   201   return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP());

   202 }

   203 

   204 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {

   205   return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);

   206 }

   207 

   208 inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {

   209   return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);

   210 }

   211 

   212 inline jlong Atomic::load(volatile jlong* src) {

   213   volatile jlong dest;

   214   _Atomic_move_long(src, &dest);

   215   return dest;

   216 }

   217 

   218 inline void Atomic::store(jlong store_value, jlong* dest) {

   219   _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);

   220 }

   221 

   222 inline void Atomic::store(jlong store_value, volatile jlong* dest) {

   223   _Atomic_move_long((volatile jlong*)&store_value, dest);

   224 }

   225 

   226 #endif // AMD64

   227 

   228 #endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_INLINE_HPP