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 /*

  * Copyright (c) 1999, 2009, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

 // For gcc - implementation is just below.

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

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

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

 // argument is unnecessary.

 #ifndef _LP64

 #define IS_MP_DECL() , int is_mp

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

 #else

 #define IS_MP_DECL()

 #define IS_MP_ARG()

 #endif // _LP64

 extern "C" {

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

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

   jint _Atomic_cmpxchg(jint exchange_value, volatile jint* dest,

                        jint compare_value IS_MP_DECL());

   jlong _Atomic_cmpxchg_long(jlong exchange_value, volatile jlong* dest,

                              jlong compare_value IS_MP_DECL());

 }

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

   return _Atomic_add(add_value, dest IS_MP_ARG());

 }

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

   return _Atomic_xchg(exchange_value, dest);

 }

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

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

 }

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

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

 }

 #ifdef AMD64

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

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

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

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

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

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

 }

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

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

 }

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

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

 }

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

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

 }

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

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

 }

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

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

 }

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

 #else // !AMD64

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

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

 }

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

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

 }

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

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

 }

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

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

 }

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

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

 }

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

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

 }

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

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

   volatile jlong dest;

   _Atomic_load_long(src, &dest);

   return dest;

 }

 #endif // AMD64

 #ifdef _GNU_SOURCE

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

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

 extern "C" {

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

     jint addend = add_value;

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

                     : "=r" (addend)

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

                     : "cc", "memory");

     return addend + add_value;

   }

 #ifdef AMD64

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

     intptr_t addend = add_value;

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

                         : "=r" (addend)

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

                         : "cc", "memory");

     return addend + add_value;

   }

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

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

                         : "=r" (exchange_value)

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

                         : "memory");

     return exchange_value;

   }

 #endif // AMD64

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

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

                           : "=r" (exchange_value)

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

                         : "memory");

     return exchange_value;

   }

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

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

                     : "=a" (exchange_value)

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

                     : "cc", "memory");

     return exchange_value;

   }

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

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

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

 #ifdef AMD64

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

                         : "=a" (exchange_value)

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

                         : "cc", "memory");

     return exchange_value;

 #else

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

     #if 0

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

     // The error message says:

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

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

     // with such inline asm code:

     volatile jlong_accessor evl, cvl, rv;

     evl.long_value = exchange_value;

     cvl.long_value = compare_value;

     int mp = os::is_MP();

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

        "je 1f \n\t"

        "lock\n\t"

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

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

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

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

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

        :  "cc", "memory");

     return cvl.long_value;

     #endif // if 0

 #endif // AMD64

   }

 }

 #undef LOCK_IF_MP

 #endif // _GNU_SOURCE