jdk8-mips64-public/hotspot: src/os_cpu/linux_x86/vm/prefetch_linux

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

     1 /*

     2  * Copyright (c) 2003, 2010, 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  */

    25 #ifndef OS_CPU_LINUX_X86_VM_PREFETCH_LINUX_X86_INLINE_HPP

    26 #define OS_CPU_LINUX_X86_VM_PREFETCH_LINUX_X86_INLINE_HPP

    28 #include "runtime/prefetch.hpp"

    31 inline void Prefetch::read (void *loc, intx interval) {

    32 #ifdef AMD64

    33   __asm__ ("prefetcht0 (%0,%1,1)" : : "r" (loc), "r" (interval));

    34 #endif // AMD64

    35 }

    37 inline void Prefetch::write(void *loc, intx interval) {

    38 #ifdef AMD64

    40   // Do not use the 3dnow prefetchw instruction.  It isn't supported on em64t.

    41   //  __asm__ ("prefetchw (%0,%1,1)" : : "r" (loc), "r" (interval));

    42   __asm__ ("prefetcht0 (%0,%1,1)" : : "r" (loc), "r" (interval));

    44 #endif // AMD64

    45 }

    47 #endif // OS_CPU_LINUX_X86_VM_PREFETCH_LINUX_X86_INLINE_HPP

src/os_cpu/linux_x86/vm/prefetch_linux_x86.inline.hpp@899ecf76b570

src/os_cpu/linux_x86/vm/prefetch_linux_x86.inline.hpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/os_cpu/linux_x86/vm/prefetch_linux_x86.inline.hpp@899ecf76b570

src/os_cpu/linux_x86/vm/prefetch_linux_x86.inline.hpp