/*
* Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
#ifndef OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP
#define OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP
// Processor dependent parts of ThreadLocalStorage
#if !defined(AMD64) && !defined(MINIMIZE_RAM_USAGE)
// map stack pointer to thread pointer - see notes in threadLS_linux_x86.cpp
#define SP_BITLENGTH 32
#define PAGE_SHIFT 12
#define PAGE_SIZE (1UL << PAGE_SHIFT)
static Thread* _sp_map[1UL << (SP_BITLENGTH - PAGE_SHIFT)];
public:
static Thread** sp_map_addr() { return _sp_map; }
static Thread* thread() {
uintptr_t sp;
__asm__ volatile ("movl %%esp, %0" : "=r" (sp));
return _sp_map[sp >> PAGE_SHIFT];
}
#else
public:
static Thread* thread() {
return (Thread*) os::thread_local_storage_at(thread_index());
}
#endif // AMD64 || MINIMIZE_RAM_USAGE
#endif // OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP