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/*
* Copyright 1999-2008 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.
*
*/
#include "incls/_precompiled.incl"
#include "incls/_assembler_windows_x86_32.cpp.incl"
void MacroAssembler::int3() {
emit_byte(0xCC);
}
// The current scheme to accelerate access to the thread
// pointer is to store the current thread in the os_exception_wrapper
// and reference the current thread from stubs and compiled code
// via the FS register. FS[0] contains a pointer to the structured
// exception block which is actually a stack address. The first time
// we call the os exception wrapper, we calculate and store the
// offset from this exception block and use that offset here.
//
// The last mechanism we used was problematic in that the
// the offset we had hard coded in the VM kept changing as Microsoft
// evolved the OS.
//
// Warning: This mechanism assumes that we only attempt to get the
// thread when we are nested below a call wrapper.
//
// movl reg, fs:[0] Get exeception pointer
// movl reg, [reg + thread_ptr_offset] Load thread
//
void MacroAssembler::get_thread(Register thread) {
// can't use ExternalAddress because it can't take NULL
AddressLiteral null(0, relocInfo::none);
prefix(FS_segment);
movptr(thread, null);
assert(ThreadLocalStorage::get_thread_ptr_offset() != 0,
"Thread Pointer Offset has not been initialized");
movl(thread, Address(thread, ThreadLocalStorage::get_thread_ptr_offset()));
}
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