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src/os_cpu/linux_x86/vm/atomic_linux_x86.inline.hpp@899ecf76b570 (annotated)

src/os_cpu/linux_x86/vm/atomic_linux_x86.inline.hpp

Wed, 25 Sep 2013 13:58:13 +0200

author
dsimms
date
Wed, 25 Sep 2013 13:58:13 +0200
changeset 5781
899ecf76b570
parent 4675
63e54c37ac64
child 6876
710a3c8b516e
permissions
-rw-r--r--

8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
Summary: Execute some code at a high virtual address value, and keep mapped
Reviewed-by: coleenp, zgu

duke@435 1 /*
simonis@4675 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
stefank@2314 25 #ifndef OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_INLINE_HPP
stefank@2314 26 #define OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_INLINE_HPP
stefank@2314 27
stefank@2314 28 #include "runtime/atomic.hpp"
stefank@2314 29 #include "runtime/os.hpp"
stefank@2314 30 #include "vm_version_x86.hpp"
stefank@2314 31
duke@435 32 // Implementation of class atomic
duke@435 33
duke@435 34 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
duke@435 35 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
duke@435 36 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
duke@435 37 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
duke@435 38 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
duke@435 39
duke@435 40 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
duke@435 41 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
duke@435 42 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
duke@435 43 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
duke@435 44 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
duke@435 45
duke@435 46
duke@435 47 // Adding a lock prefix to an instruction on MP machine
duke@435 48 #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: "
duke@435 49
duke@435 50 inline jint Atomic::add (jint add_value, volatile jint* dest) {
duke@435 51 jint addend = add_value;
duke@435 52 int mp = os::is_MP();
duke@435 53 __asm__ volatile ( LOCK_IF_MP(%3) "xaddl %0,(%2)"
duke@435 54 : "=r" (addend)
duke@435 55 : "0" (addend), "r" (dest), "r" (mp)
duke@435 56 : "cc", "memory");
duke@435 57 return addend + add_value;
duke@435 58 }
duke@435 59
duke@435 60 inline void Atomic::inc (volatile jint* dest) {
duke@435 61 int mp = os::is_MP();
duke@435 62 __asm__ volatile (LOCK_IF_MP(%1) "addl $1,(%0)" :
duke@435 63 : "r" (dest), "r" (mp) : "cc", "memory");
duke@435 64 }
duke@435 65
duke@435 66 inline void Atomic::inc_ptr(volatile void* dest) {
duke@435 67 inc_ptr((volatile intptr_t*)dest);
duke@435 68 }
duke@435 69
duke@435 70 inline void Atomic::dec (volatile jint* dest) {
duke@435 71 int mp = os::is_MP();
duke@435 72 __asm__ volatile (LOCK_IF_MP(%1) "subl $1,(%0)" :
duke@435 73 : "r" (dest), "r" (mp) : "cc", "memory");
duke@435 74 }
duke@435 75
duke@435 76 inline void Atomic::dec_ptr(volatile void* dest) {
duke@435 77 dec_ptr((volatile intptr_t*)dest);
duke@435 78 }
duke@435 79
duke@435 80 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
duke@435 81 __asm__ volatile ( "xchgl (%2),%0"
duke@435 82 : "=r" (exchange_value)
duke@435 83 : "0" (exchange_value), "r" (dest)
duke@435 84 : "memory");
duke@435 85 return exchange_value;
duke@435 86 }
duke@435 87
duke@435 88 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
duke@435 89 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
duke@435 90 }
duke@435 91
duke@435 92
duke@435 93 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
duke@435 94 int mp = os::is_MP();
duke@435 95 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"
duke@435 96 : "=a" (exchange_value)
duke@435 97 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
duke@435 98 : "cc", "memory");
duke@435 99 return exchange_value;
duke@435 100 }
duke@435 101
duke@435 102 #ifdef AMD64
duke@435 103 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
duke@435 104 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
duke@435 105
duke@435 106 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
duke@435 107 intptr_t addend = add_value;
duke@435 108 bool mp = os::is_MP();
duke@435 109 __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)"
duke@435 110 : "=r" (addend)
duke@435 111 : "0" (addend), "r" (dest), "r" (mp)
duke@435 112 : "cc", "memory");
duke@435 113 return addend + add_value;
duke@435 114 }
duke@435 115
duke@435 116 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
duke@435 117 return (void*)add_ptr(add_value, (volatile intptr_t*)dest);
duke@435 118 }
duke@435 119
duke@435 120 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
duke@435 121 bool mp = os::is_MP();
duke@435 122 __asm__ __volatile__ (LOCK_IF_MP(%1) "addq $1,(%0)"
duke@435 123 :
duke@435 124 : "r" (dest), "r" (mp)
duke@435 125 : "cc", "memory");
duke@435 126 }
duke@435 127
duke@435 128 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
duke@435 129 bool mp = os::is_MP();
duke@435 130 __asm__ __volatile__ (LOCK_IF_MP(%1) "subq $1,(%0)"
duke@435 131 :
duke@435 132 : "r" (dest), "r" (mp)
duke@435 133 : "cc", "memory");
duke@435 134 }
duke@435 135
duke@435 136 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
duke@435 137 __asm__ __volatile__ ("xchgq (%2),%0"
duke@435 138 : "=r" (exchange_value)
duke@435 139 : "0" (exchange_value), "r" (dest)
duke@435 140 : "memory");
duke@435 141 return exchange_value;
duke@435 142 }
duke@435 143
duke@435 144 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
duke@435 145 bool mp = os::is_MP();
duke@435 146 __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)"
duke@435 147 : "=a" (exchange_value)
duke@435 148 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
duke@435 149 : "cc", "memory");
duke@435 150 return exchange_value;
duke@435 151 }
duke@435 152
duke@435 153 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
duke@435 154 return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
duke@435 155 }
duke@435 156
duke@435 157 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
duke@435 158 return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
duke@435 159 }
duke@435 160
kvn@2434 161 inline jlong Atomic::load(volatile jlong* src) { return *src; }
kvn@2434 162
kvn@2434 163 #else // !AMD64
duke@435 164
duke@435 165 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
duke@435 166 return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest);
duke@435 167 }
duke@435 168
duke@435 169 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
duke@435 170 return (void*)Atomic::add((jint)add_value, (volatile jint*)dest);
duke@435 171 }
duke@435 172
duke@435 173
duke@435 174 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
duke@435 175 inc((volatile jint*)dest);
duke@435 176 }
duke@435 177
duke@435 178 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
duke@435 179 dec((volatile jint*)dest);
duke@435 180 }
duke@435 181
duke@435 182 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
duke@435 183 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
duke@435 184 }
duke@435 185
kvn@2434 186 extern "C" {
kvn@2434 187 // defined in linux_x86.s
kvn@2434 188 jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
kvn@2434 189 void _Atomic_move_long(volatile jlong* src, volatile jlong* dst);
kvn@2434 190 }
kvn@2434 191
duke@435 192 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
duke@435 193 return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP());
duke@435 194 }
duke@435 195
duke@435 196 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
duke@435 197 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
duke@435 198 }
duke@435 199
duke@435 200 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
duke@435 201 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
duke@435 202 }
kvn@2434 203
kvn@2434 204 inline jlong Atomic::load(volatile jlong* src) {
kvn@2434 205 volatile jlong dest;
kvn@2434 206 _Atomic_move_long(src, &dest);
kvn@2434 207 return dest;
kvn@2434 208 }
kvn@2434 209
kvn@2434 210 inline void Atomic::store(jlong store_value, jlong* dest) {
kvn@2434 211 _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
kvn@2434 212 }
kvn@2434 213
kvn@2434 214 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
kvn@2434 215 _Atomic_move_long((volatile jlong*)&store_value, dest);
kvn@2434 216 }
kvn@2434 217
duke@435 218 #endif // AMD64
stefank@2314 219
stefank@2314 220 #endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_INLINE_HPP

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