1 /* 2 * Copyright (c) 1999, 2003, 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 // Processor dependent parts of ThreadLocalStorage 26 27 #ifndef AMD64 28 // map stack pointer to thread pointer - see notes in threadLS_linux_x86.cpp 29 #define SP_BITLENGTH 32 30 #define PAGE_SHIFT 12 31 #define PAGE_SIZE (1UL << PAGE_SHIFT) 32 static Thread* _sp_map[1UL << (SP_BITLENGTH - PAGE_SHIFT)]; 33 #endif // !AMD64 34 35 public: 36 37 #ifndef AMD64 38 static Thread** sp_map_addr() { return _sp_map; } 39 #endif // !AMD64 40 41 static Thread* thread() { 42 #ifdef AMD64 43 return (Thread*) os::thread_local_storage_at(thread_index()); 44 #else 45 uintptr_t sp; 46 __asm__ volatile ("movl %%esp, %0" : "=r" (sp)); 47 return _sp_map[sp >> PAGE_SHIFT]; 48 #endif // AMD64 49 }