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_SOLARIS_X86_VM_ATOMIC_SOLARIS_X86_INLINE_HPP

    26 #define OS_CPU_SOLARIS_X86_VM_ATOMIC_SOLARIS_X86_INLINE_HPP

    27 

    28 #include "runtime/atomic.hpp"

    29 #include "runtime/os.hpp"

    30 

    31 inline void Atomic::store    (jbyte    store_value, jbyte*    dest) { *dest = store_value; }

    32 inline void Atomic::store    (jshort   store_value, jshort*   dest) { *dest = store_value; }

    33 inline void Atomic::store    (jint     store_value, jint*     dest) { *dest = store_value; }

    34 

    35 

    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 inline void Atomic::inc    (volatile jint*     dest) { (void)add    (1, dest); }

    46 inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); }

    47 inline void Atomic::inc_ptr(volatile void*     dest) { (void)add_ptr(1, dest); }

    48 

    49 inline void Atomic::dec    (volatile jint*     dest) { (void)add    (-1, dest); }

    50 inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); }

    51 inline void Atomic::dec_ptr(volatile void*     dest) { (void)add_ptr(-1, dest); }

    52 

    53 // For Sun Studio - implementation is in solaris_x86_[32/64].il.

    54 // For gcc - implementation is just below.

    55 

    56 // The lock prefix can be omitted for certain instructions on uniprocessors; to

    57 // facilitate this, os::is_MP() is passed as an additional argument.  64-bit

    58 // processors are assumed to be multi-threaded and/or multi-core, so the extra

    59 // argument is unnecessary.

    60 #ifndef _LP64

    61 #define IS_MP_DECL() , int is_mp

    62 #define IS_MP_ARG()  , (int) os::is_MP()

    63 #else

    64 #define IS_MP_DECL()

    65 #define IS_MP_ARG()

    66 #endif // _LP64

    67 

    68 extern "C" {

    69   jint _Atomic_add(jint add_value, volatile jint* dest IS_MP_DECL());

    70   jint _Atomic_xchg(jint exchange_value, volatile jint* dest);

    71   jbyte _Atomic_cmpxchg_byte(jbyte exchange_value, volatile jbyte* dest,

    72                        jbyte compare_value IS_MP_DECL());

    73   jint _Atomic_cmpxchg(jint exchange_value, volatile jint* dest,

    74                        jint compare_value IS_MP_DECL());

    75   jlong _Atomic_cmpxchg_long(jlong exchange_value, volatile jlong* dest,

    76                              jlong compare_value IS_MP_DECL());

    77 }

    78 

    79 inline jint     Atomic::add    (jint     add_value, volatile jint*     dest) {

    80   return _Atomic_add(add_value, dest IS_MP_ARG());

    81 }

    82 

    83 inline jint     Atomic::xchg       (jint     exchange_value, volatile jint*     dest) {

    84   return _Atomic_xchg(exchange_value, dest);

    85 }

    86 

    87 #define VM_HAS_SPECIALIZED_CMPXCHG_BYTE

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

    89   return _Atomic_cmpxchg_byte(exchange_value, dest, compare_value IS_MP_ARG());

    90 }

    91 

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

    93   return _Atomic_cmpxchg(exchange_value, dest, compare_value IS_MP_ARG());

    94 }

    95 

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

    97   return _Atomic_cmpxchg_long(exchange_value, dest, compare_value IS_MP_ARG());

    98 }

    99 

   100 

   101 #ifdef AMD64

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

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

   104 extern "C" jlong _Atomic_add_long(jlong add_value, volatile jlong* dest);

   105 extern "C" jlong _Atomic_xchg_long(jlong exchange_value, volatile jlong* dest);

   106 

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

   108   return (intptr_t)_Atomic_add_long((jlong)add_value, (volatile jlong*)dest);

   109 }

   110 

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

   112   return (void*)_Atomic_add_long((jlong)add_value, (volatile jlong*)dest);

   113 }

   114 

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

   116   return (intptr_t)_Atomic_xchg_long((jlong)exchange_value, (volatile jlong*)dest);

   117 }

   118 

   119 inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {

   120   return (void*)_Atomic_xchg_long((jlong)exchange_value, (volatile jlong*)dest);

   121 }

   122 

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

   124   return (intptr_t)_Atomic_cmpxchg_long((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);

   125 }

   126 

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

   128   return (void*)_Atomic_cmpxchg_long((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);

   129 }

   130 

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

   132 

   133 #else // !AMD64

   134 

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

   136   return (intptr_t)add((jint)add_value, (volatile jint*)dest);

   137 }

   138 

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

   140   return (void*)add((jint)add_value, (volatile jint*)dest);

   141 }

   142 

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

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

   145 }

   146 

   147 inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {

   148   return (void*)xchg((jint)exchange_value, (volatile jint*)dest);

   149 }

   150 

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

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

   153 }

   154 

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

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

   157 }

   158 

   159 extern "C" void _Atomic_move_long(volatile jlong* src, volatile jlong* dst);

   160 

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

   162   volatile jlong dest;

   163   _Atomic_move_long(src, &dest);

   164   return dest;

   165 }

   166 

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

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

   169 }

   170 

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

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

   173 }

   174 

   175 #endif // AMD64

   176 

   177 #ifdef _GNU_SOURCE

   178 // Add a lock prefix to an instruction on an MP machine

   179 #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: "

   180 

   181 extern "C" {

   182   inline jint _Atomic_add(jint add_value, volatile jint* dest, int mp) {

   183     jint addend = add_value;

   184     __asm__ volatile (  LOCK_IF_MP(%3) "xaddl %0,(%2)"

   185                     : "=r" (addend)

   186                     : "0" (addend), "r" (dest), "r" (mp)

   187                     : "cc", "memory");

   188     return addend + add_value;

   189   }

   190 

   191 #ifdef AMD64

   192   inline jlong _Atomic_add_long(jlong add_value, volatile jlong* dest, int mp) {

   193     intptr_t addend = add_value;

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

   195                         : "=r" (addend)

   196                         : "0" (addend), "r" (dest), "r" (mp)

   197                         : "cc", "memory");

   198     return addend + add_value;

   199   }

   200 

   201   inline jlong _Atomic_xchg_long(jlong exchange_value, volatile jlong* dest) {

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

   203                         : "=r" (exchange_value)

   204                         : "0" (exchange_value), "r" (dest)

   205                         : "memory");

   206     return exchange_value;

   207   }

   208 

   209 #endif // AMD64

   210 

   211   inline jint _Atomic_xchg(jint exchange_value, volatile jint* dest) {

   212     __asm__ __volatile__ ("xchgl (%2),%0"

   213                           : "=r" (exchange_value)

   214                         : "0" (exchange_value), "r" (dest)

   215                         : "memory");

   216     return exchange_value;

   217   }

   218 

   219   inline jint _Atomic_cmpxchg(jint exchange_value, volatile jint* dest, jint compare_value, int mp) {

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

   221                     : "=a" (exchange_value)

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

   223                     : "cc", "memory");

   224     return exchange_value;

   225   }

   226 

   227 

   228   inline jbyte _Atomic_cmpxchg_byte(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value, int mp) {

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

   230                     : "=a" (exchange_value)

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

   232                     : "cc", "memory");

   233     return exchange_value;

   234   }

   235 

   236   // This is the interface to the atomic instruction in solaris_i486.s.

   237   jlong _Atomic_cmpxchg_long_gcc(jlong exchange_value, volatile jlong* dest, jlong compare_value, int mp);

   238 

   239   inline jlong _Atomic_cmpxchg_long(jlong exchange_value, volatile jlong* dest, jlong compare_value, int mp) {

   240 #ifdef AMD64

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

   242                         : "=a" (exchange_value)

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

   244                         : "cc", "memory");

   245     return exchange_value;

   246 #else

   247     return _Atomic_cmpxchg_long_gcc(exchange_value, dest, compare_value, os::is_MP());

   248 

   249     #if 0

   250     // The code below does not work presumably because of the bug in gcc

   251     // The error message says:

   252     //   can't find a register in class BREG while reloading asm

   253     // However I want to save this code and later replace _Atomic_cmpxchg_long_gcc

   254     // with such inline asm code:

   255 

   256     volatile jlong_accessor evl, cvl, rv;

   257     evl.long_value = exchange_value;

   258     cvl.long_value = compare_value;

   259     int mp = os::is_MP();

   260 

   261     __asm__ volatile ("cmp $0, %%esi\n\t"

   262        "je 1f \n\t"

   263        "lock\n\t"

   264        "1: cmpxchg8b (%%edi)\n\t"

   265        : "=a"(cvl.words[0]),   "=d"(cvl.words[1])

   266        : "a"(cvl.words[0]), "d"(cvl.words[1]),

   267          "b"(evl.words[0]), "c"(evl.words[1]),

   268          "D"(dest), "S"(mp)

   269        :  "cc", "memory");

   270     return cvl.long_value;

   271     #endif // if 0

   272 #endif // AMD64

   273   }

   274 }

   275 #undef LOCK_IF_MP

   276 

   277 #endif // _GNU_SOURCE

   278 

   279 #endif // OS_CPU_SOLARIS_X86_VM_ATOMIC_SOLARIS_X86_INLINE_HPP