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comparison src/os_cpu/linux_x86/vm/threadLS_linux_x86.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1999-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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 }