1/* 2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "asm/macroAssembler.hpp" 27#include "asm/macroAssembler.inline.hpp" 28#include "runtime/os.hpp" 29 30void MacroAssembler::int3() { 31 emit_int8((unsigned char)0xCC); 32} 33 34#ifndef _LP64 35// The current scheme to accelerate access to the thread 36// pointer is to store the current thread in the os_exception_wrapper 37// and reference the current thread from stubs and compiled code 38// via the FS register. FS[0] contains a pointer to the structured 39// exception block which is actually a stack address. The first time 40// we call the os exception wrapper, we calculate and store the 41// offset from this exception block and use that offset here. 42// 43// The last mechanism we used was problematic in that the 44// the offset we had hard coded in the VM kept changing as Microsoft 45// evolved the OS. 46// 47// Warning: This mechanism assumes that we only attempt to get the 48// thread when we are nested below a call wrapper. 49// 50// movl reg, fs:[0] Get exeception pointer 51// movl reg, [reg + thread_ptr_offset] Load thread 52// 53void MacroAssembler::get_thread(Register thread) { 54 prefix(FS_segment); 55 movptr(thread, ExternalAddress(NULL)); 56 assert(os::win32::get_thread_ptr_offset() != 0, 57 "Thread Pointer Offset has not been initialized"); 58 movl(thread, Address(thread, os::win32::get_thread_ptr_offset())); 59} 60 61// #else - use shared x86 implementation in cpu/x86/vm/macroAssembler_x86.cpp 62 63#endif 64