1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os_cpu/windows_x86/vm/assembler_windows_x86.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,101 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "asm/macroAssembler.hpp"
1.30 +#include "asm/macroAssembler.inline.hpp"
1.31 +#include "runtime/os.hpp"
1.32 +#include "runtime/threadLocalStorage.hpp"
1.33 +
1.34 +
1.35 +void MacroAssembler::int3() {
1.36 + emit_int8((unsigned char)0xCC);
1.37 +}
1.38 +
1.39 +#ifndef _LP64
1.40 +// The current scheme to accelerate access to the thread
1.41 +// pointer is to store the current thread in the os_exception_wrapper
1.42 +// and reference the current thread from stubs and compiled code
1.43 +// via the FS register. FS[0] contains a pointer to the structured
1.44 +// exception block which is actually a stack address. The first time
1.45 +// we call the os exception wrapper, we calculate and store the
1.46 +// offset from this exception block and use that offset here.
1.47 +//
1.48 +// The last mechanism we used was problematic in that the
1.49 +// the offset we had hard coded in the VM kept changing as Microsoft
1.50 +// evolved the OS.
1.51 +//
1.52 +// Warning: This mechanism assumes that we only attempt to get the
1.53 +// thread when we are nested below a call wrapper.
1.54 +//
1.55 +// movl reg, fs:[0] Get exeception pointer
1.56 +// movl reg, [reg + thread_ptr_offset] Load thread
1.57 +//
1.58 +void MacroAssembler::get_thread(Register thread) {
1.59 + // can't use ExternalAddress because it can't take NULL
1.60 + AddressLiteral null(0, relocInfo::none);
1.61 +
1.62 + prefix(FS_segment);
1.63 + movptr(thread, null);
1.64 + assert(ThreadLocalStorage::get_thread_ptr_offset() != 0,
1.65 + "Thread Pointer Offset has not been initialized");
1.66 + movl(thread, Address(thread, ThreadLocalStorage::get_thread_ptr_offset()));
1.67 +}
1.68 +#else
1.69 +// call (Thread*)TlsGetValue(thread_index());
1.70 +void MacroAssembler::get_thread(Register thread) {
1.71 + if (thread != rax) {
1.72 + push(rax);
1.73 + }
1.74 + push(rdi);
1.75 + push(rsi);
1.76 + push(rdx);
1.77 + push(rcx);
1.78 + push(r8);
1.79 + push(r9);
1.80 + push(r10);
1.81 + // XXX
1.82 + mov(r10, rsp);
1.83 + andq(rsp, -16);
1.84 + push(r10);
1.85 + push(r11);
1.86 +
1.87 + movl(c_rarg0, ThreadLocalStorage::thread_index());
1.88 + call(RuntimeAddress((address)TlsGetValue));
1.89 +
1.90 + pop(r11);
1.91 + pop(rsp);
1.92 + pop(r10);
1.93 + pop(r9);
1.94 + pop(r8);
1.95 + pop(rcx);
1.96 + pop(rdx);
1.97 + pop(rsi);
1.98 + pop(rdi);
1.99 + if (thread != rax) {
1.100 + mov(thread, rax);
1.101 + pop(rax);
1.102 + }
1.103 +}
1.104 +#endif
