1 /*

     2  * Copyright (c) 1999, 2016, 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_HPP

    26 #define OS_CPU_SOLARIS_X86_VM_ATOMIC_SOLARIS_X86_HPP

    27 

    28 #include "runtime/os.hpp"

    29 

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

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

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

    33 

    34 

    35 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }

    36 inline void Atomic::store_ptr(void*    store_value, void*     dest) { *(void**)dest = store_value; }

    37 

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

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

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

    41 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }

    42 inline void Atomic::store_ptr(void*    store_value, volatile void*     dest) { *(void* volatile *)dest = store_value; }

    43 

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

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

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

    47 

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

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

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

    51 

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

    53 // For gcc - implementation is just below.

    54 

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

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

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

    58 // argument is unnecessary.

    59 #ifndef _LP64

    60 #define IS_MP_DECL() , int is_mp

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

    62 #else

    63 #define IS_MP_DECL()

    64 #define IS_MP_ARG()

    65 #endif // _LP64

    66 

    67 extern "C" {

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

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

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

    71                        jbyte compare_value IS_MP_DECL());

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

    73                        jint compare_value IS_MP_DECL());

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

    75                              jlong compare_value IS_MP_DECL());

    76 }

    77 

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

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

    80 }

    81 

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

    83   return _Atomic_xchg(exchange_value, dest);

    84 }

    85 

    86 #define VM_HAS_SPECIALIZED_CMPXCHG_BYTE

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

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

    89 }

    90 

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

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

    93 }

    94 

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

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

    97 }

    98 

    99 

   100 #ifdef AMD64

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

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

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

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

   105 

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

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

   108 }

   109 

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

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

   112 }

   113 

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

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

   116 }

   117 

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

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

   120 }

   121 

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

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

   124 }

   125 

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

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

   128 }

   129 

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

   131 

   132 #else // !AMD64

   133 

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

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

   136 }

   137 

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

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

   140 }

   141 

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

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

   144 }

   145 

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

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

   148 }

   149 

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

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

   152 }

   153 

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

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

   156 }

   157 

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

   159 

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

   161   volatile jlong dest;

   162   _Atomic_move_long(src, &dest);

   163   return dest;

   164 }

   165 

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

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

   168 }

   169 

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

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

   172 }

   173 

   174 #endif // AMD64

   175 

   176 #ifdef _GNU_SOURCE

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

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

   179 

   180 extern "C" {

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

   182     jint addend = add_value;

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

   184                     : "=r" (addend)

   185                     : "0" (addend), "r" (dest), "r" (mp)

   186                     : "cc", "memory");

   187     return addend + add_value;

   188   }

   189 

   190 #ifdef AMD64

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

   192     intptr_t addend = add_value;

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

   194                         : "=r" (addend)

   195                         : "0" (addend), "r" (dest), "r" (mp)

   196                         : "cc", "memory");

   197     return addend + add_value;

   198   }

   199 

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

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

   202                         : "=r" (exchange_value)

   203                         : "0" (exchange_value), "r" (dest)

   204                         : "memory");

   205     return exchange_value;

   206   }

   207 

   208 #endif // AMD64

   209 

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

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

   212                           : "=r" (exchange_value)

   213                         : "0" (exchange_value), "r" (dest)

   214                         : "memory");

   215     return exchange_value;

   216   }

   217 

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

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

   220                     : "=a" (exchange_value)

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

   222                     : "cc", "memory");

   223     return exchange_value;

   224   }

   225 

   226 

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

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

   229                     : "=a" (exchange_value)

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

   231                     : "cc", "memory");

   232     return exchange_value;

   233   }

   234 

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

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

   237 

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

   239 #ifdef AMD64

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

   241                         : "=a" (exchange_value)

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

   243                         : "cc", "memory");

   244     return exchange_value;

   245 #else

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

   247 

   248     #if 0

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

   250     // The error message says:

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

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

   253     // with such inline asm code:

   254 

   255     volatile jlong_accessor evl, cvl, rv;

   256     evl.long_value = exchange_value;

   257     cvl.long_value = compare_value;

   258     int mp = os::is_MP();

   259 

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

   261        "je 1f \n\t"

   262        "lock\n\t"

   263        "1: cmpxchg8b (%%edi)\n\t"

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

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

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

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

   268        :  "cc", "memory");

   269     return cvl.long_value;

   270     #endif // if 0

   271 #endif // AMD64

   272   }

   273 }

   274 #undef LOCK_IF_MP

   275 

   276 #endif // _GNU_SOURCE

   277 

   278 #endif // OS_CPU_SOLARIS_X86_VM_ATOMIC_SOLARIS_X86_HPP