1 /* 2 * Copyright (c) 1999, 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 */ 24 25 #ifndef OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP 26 #define OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP 27 28 // Processor dependent parts of ThreadLocalStorage 29 30 #if !defined(AMD64) && !defined(MINIMIZE_RAM_USAGE) 31 32 // map stack pointer to thread pointer - see notes in threadLS_linux_x86.cpp 33 #define SP_BITLENGTH 32 34 #define PAGE_SHIFT 12 35 #define PAGE_SIZE (1UL << PAGE_SHIFT) 36 static Thread* _sp_map[1UL << (SP_BITLENGTH - PAGE_SHIFT)]; 37 38 public: 39 40 static Thread** sp_map_addr() { return _sp_map; } 41 42 static Thread* thread() { 43 uintptr_t sp; 44 __asm__ volatile ("movl %%esp, %0" : "=r" (sp)); 45 return _sp_map[sp >> PAGE_SHIFT]; 46 } 47 48 #else 49 50 public: 51 52 static Thread* thread() { 53 return (Thread*) os::thread_local_storage_at(thread_index()); 54 } 55 56 #endif // AMD64 || MINIMIZE_RAM_USAGE 57 58 #endif // OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP