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/*
* Copyright 1999-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.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
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