Mercurial > jdk8-mips64-public > hotspot / annotate
src/os_cpu/linux_x86/vm/threadLS_linux_x86.hpp@899ecf76b570 (annotated)
src/os_cpu/linux_x86/vm/threadLS_linux_x86.hpp
Wed, 25 Sep 2013 13:58:13 +0200
- author
- dsimms
- date
- Wed, 25 Sep 2013 13:58:13 +0200
- changeset 5781
- 899ecf76b570
- parent 2995
- 65dba8692db7
- 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 | /* |
| stefank@2314 | 2 | * Copyright (c) 1999, 2010, 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_THREADLS_LINUX_X86_HPP |
| stefank@2314 | 26 | #define OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP |
| stefank@2314 | 27 | |
| duke@435 | 28 | // Processor dependent parts of ThreadLocalStorage |
| duke@435 | 29 | |
| jcoomes@2995 | 30 | #if !defined(AMD64) && !defined(MINIMIZE_RAM_USAGE) |
| jcoomes@2995 | 31 | |
| duke@435 | 32 | // map stack pointer to thread pointer - see notes in threadLS_linux_x86.cpp |
| duke@435 | 33 | #define SP_BITLENGTH 32 |
| duke@435 | 34 | #define PAGE_SHIFT 12 |
| duke@435 | 35 | #define PAGE_SIZE (1UL << PAGE_SHIFT) |
| duke@435 | 36 | static Thread* _sp_map[1UL << (SP_BITLENGTH - PAGE_SHIFT)]; |
| duke@435 | 37 | |
| duke@435 | 38 | public: |
| duke@435 | 39 | |
| duke@435 | 40 | static Thread** sp_map_addr() { return _sp_map; } |
| duke@435 | 41 | |
| duke@435 | 42 | static Thread* thread() { |
| duke@435 | 43 | uintptr_t sp; |
| duke@435 | 44 | __asm__ volatile ("movl %%esp, %0" : "=r" (sp)); |
| duke@435 | 45 | return _sp_map[sp >> PAGE_SHIFT]; |
| duke@435 | 46 | } |
| stefank@2314 | 47 | |
| jcoomes@2995 | 48 | #else |
| jcoomes@2995 | 49 | |
| jcoomes@2995 | 50 | public: |
| jcoomes@2995 | 51 | |
| jcoomes@2995 | 52 | static Thread* thread() { |
| jcoomes@2995 | 53 | return (Thread*) os::thread_local_storage_at(thread_index()); |
| jcoomes@2995 | 54 | } |
| jcoomes@2995 | 55 | |
| jcoomes@2995 | 56 | #endif // AMD64 || MINIMIZE_RAM_USAGE |
| jcoomes@2995 | 57 | |
| stefank@2314 | 58 | #endif // OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP |
