Mercurial > jdk8-mips64-public > hotspot / annotate
src/os_cpu/linux_x86/vm/os_linux_x86.inline.hpp@899ecf76b570 (annotated)
src/os_cpu/linux_x86/vm/os_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 4153
- b9a9ed0f8eeb
- 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
| phh@3378 | 1 | /* |
| mikael@4153 | 2 | * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
| phh@3378 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| phh@3378 | 4 | * |
| phh@3378 | 5 | * This code is free software; you can redistribute it and/or modify it |
| phh@3378 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| phh@3378 | 7 | * published by the Free Software Foundation. |
| phh@3378 | 8 | * |
| phh@3378 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| phh@3378 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| phh@3378 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| phh@3378 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| phh@3378 | 13 | * accompanied this code). |
| phh@3378 | 14 | * |
| phh@3378 | 15 | * You should have received a copy of the GNU General Public License version |
| phh@3378 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| phh@3378 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| phh@3378 | 18 | * |
| phh@3378 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| phh@3378 | 20 | * or visit www.oracle.com if you need additional information or have any |
| phh@3378 | 21 | * questions. |
| phh@3378 | 22 | * |
| phh@3378 | 23 | */ |
| phh@3378 | 24 | |
| phh@3378 | 25 | #ifndef OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP |
| phh@3378 | 26 | #define OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP |
| phh@3378 | 27 | |
| phh@3378 | 28 | #include "runtime/os.hpp" |
| phh@3378 | 29 | |
| phh@3378 | 30 | // See http://www.technovelty.org/code/c/reading-rdtsc.htl for details |
| phh@3378 | 31 | inline jlong os::rdtsc() { |
| phh@3378 | 32 | #ifndef AMD64 |
| phh@3378 | 33 | // 64 bit result in edx:eax |
| phh@3378 | 34 | uint64_t res; |
| phh@3378 | 35 | __asm__ __volatile__ ("rdtsc" : "=A" (res)); |
| phh@3378 | 36 | return (jlong)res; |
| phh@3378 | 37 | #else |
| phh@3378 | 38 | uint64_t res; |
| phh@3378 | 39 | uint32_t ts1, ts2; |
| phh@3378 | 40 | __asm__ __volatile__ ("rdtsc" : "=a" (ts1), "=d" (ts2)); |
| phh@3378 | 41 | res = ((uint64_t)ts1 | (uint64_t)ts2 << 32); |
| phh@3378 | 42 | return (jlong)res; |
| phh@3378 | 43 | #endif // AMD64 |
| phh@3378 | 44 | } |
| phh@3378 | 45 | |
| phh@3378 | 46 | #endif // OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP |
