jdk8-mips64-public/hotspot: src/os_cpu/linux_x86/vm/os_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) 2011, 2012, 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_OS_LINUX_X86_INLINE_HPP

    26 #define OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP

    28 #include "runtime/os.hpp"

    30 // See http://www.technovelty.org/code/c/reading-rdtsc.htl for details

    31 inline jlong os::rdtsc() {

    32 #ifndef AMD64

    33   // 64 bit result in edx:eax

    34   uint64_t res;

    35   __asm__ __volatile__ ("rdtsc" : "=A" (res));

    36   return (jlong)res;

    37 #else

    38   uint64_t res;

    39   uint32_t ts1, ts2;

    40   __asm__ __volatile__ ("rdtsc" : "=a" (ts1), "=d" (ts2));

    41   res = ((uint64_t)ts1 | (uint64_t)ts2 << 32);

    42   return (jlong)res;

    43 #endif // AMD64

    44 }

    46 #endif // OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP

src/os_cpu/linux_x86/vm/os_linux_x86.inline.hpp@899ecf76b570

src/os_cpu/linux_x86/vm/os_linux_x86.inline.hpp

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

src/os_cpu/linux_x86/vm/os_linux_x86.inline.hpp@899ecf76b570

src/os_cpu/linux_x86/vm/os_linux_x86.inline.hpp