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annotate src/os_cpu/linux_x86/vm/threadLS_linux_x86.hpp @ 21947:9f70fc90169d

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Truffle: remove expensive assertion
author Andreas Woess <andreas.woess@oracle.com>
date Wed, 17 Jun 2015 04:09:30 +0200
parents 65dba8692db7
children
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1 /*
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP
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26 #define OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP
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27
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28 // Processor dependent parts of ThreadLocalStorage
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29
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30 #if !defined(AMD64) && !defined(MINIMIZE_RAM_USAGE)
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31
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32 // map stack pointer to thread pointer - see notes in threadLS_linux_x86.cpp
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33 #define SP_BITLENGTH 32
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34 #define PAGE_SHIFT 12
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35 #define PAGE_SIZE (1UL << PAGE_SHIFT)
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36 static Thread* _sp_map[1UL << (SP_BITLENGTH - PAGE_SHIFT)];
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37
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38 public:
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39
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40 static Thread** sp_map_addr() { return _sp_map; }
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41
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42 static Thread* thread() {
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43 uintptr_t sp;
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44 __asm__ volatile ("movl %%esp, %0" : "=r" (sp));
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45 return _sp_map[sp >> PAGE_SHIFT];
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46 }
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47
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48 #else
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49
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50 public:
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51
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52 static Thread* thread() {
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53 return (Thread*) os::thread_local_storage_at(thread_index());
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54 }
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55
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56 #endif // AMD64 || MINIMIZE_RAM_USAGE
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57
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58 #endif // OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP