/*

 * Copyright 1999-2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

  // Processor dependent parts of ThreadLocalStorage

#ifndef AMD64

  // 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)];

#endif // !AMD64

public:

#ifndef AMD64

  static Thread** sp_map_addr() { return _sp_map; }

#endif // !AMD64

  static Thread* thread() {

#ifdef AMD64

    return (Thread*) os::thread_local_storage_at(thread_index());

#else

    uintptr_t sp;

    __asm__ volatile ("movl %%esp, %0" : "=r" (sp));

    return _sp_map[sp >> PAGE_SHIFT];

#endif // AMD64

  }