| /* |
| * Copyright (c) 1999, 2015, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "asm/macroAssembler.hpp" |
| #include "asm/macroAssembler.inline.hpp" |
| #include "runtime/os.hpp" |
| |
| void MacroAssembler::int3() { |
| emit_int8((unsigned char)0xCC); |
| } |
| |
| #ifndef _LP64 |
| // 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) { |
| prefix(FS_segment); |
| movptr(thread, ExternalAddress(NULL)); |
| assert(os::win32::get_thread_ptr_offset() != 0, |
| "Thread Pointer Offset has not been initialized"); |
| movl(thread, Address(thread, os::win32::get_thread_ptr_offset())); |
| } |
| |
| // #else - use shared x86 implementation in cpu/x86/vm/macroAssembler_x86.cpp |
| |
| #endif |
