jdk8-mips64-public/hotspot: src/os_cpu/windows_x86/vm/assembler_windows

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

     1 /*

     2  * Copyright (c) 1999, 2008, 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  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_assembler_windows_x86.cpp.incl"

    29 void MacroAssembler::int3() {

    30   emit_byte(0xCC);

    31 }

    33 #ifndef _LP64

    34 //  The current scheme to accelerate access to the thread

    35 //  pointer is to store the current thread in the os_exception_wrapper

    36 //  and reference the current thread from stubs and compiled code

    37 //  via the FS register.  FS[0] contains a pointer to the structured

    38 //  exception block which is actually a stack address.  The first time

    39 //  we call the os exception wrapper, we calculate and store the

    40 //  offset from this exception block and use that offset here.

    41 //

    42 //  The last mechanism we used was problematic in that the

    43 //  the offset we had hard coded in the VM kept changing as Microsoft

    44 //  evolved the OS.

    45 //

    46 // Warning: This mechanism assumes that we only attempt to get the

    47 //          thread when we are nested below a call wrapper.

    48 //

    49 // movl reg, fs:[0]                        Get exeception pointer

    50 // movl reg, [reg + thread_ptr_offset]     Load thread

    51 //

    52 void MacroAssembler::get_thread(Register thread) {

    53   // can't use ExternalAddress because it can't take NULL

    54   AddressLiteral null(0, relocInfo::none);

    56   prefix(FS_segment);

    57   movptr(thread, null);

    58   assert(ThreadLocalStorage::get_thread_ptr_offset() != 0,

    59          "Thread Pointer Offset has not been initialized");

    60   movl(thread, Address(thread, ThreadLocalStorage::get_thread_ptr_offset()));

    61 }

    62 #else

    63 // call (Thread*)TlsGetValue(thread_index());

    64 void MacroAssembler::get_thread(Register thread) {

    65    if (thread != rax) {

    66      push(rax);

    67    }

    68    push(rdi);

    69    push(rsi);

    70    push(rdx);

    71    push(rcx);

    72    push(r8);

    73    push(r9);

    74    push(r10);

    75    // XXX

    76    mov(r10, rsp);

    77    andq(rsp, -16);

    78    push(r10);

    79    push(r11);

    81    movl(c_rarg0, ThreadLocalStorage::thread_index());

    82    call(RuntimeAddress((address)TlsGetValue));

    84    pop(r11);

    85    pop(rsp);

    86    pop(r10);

    87    pop(r9);

    88    pop(r8);

    89    pop(rcx);

    90    pop(rdx);

    91    pop(rsi);

    92    pop(rdi);

    93    if (thread != rax) {

    94        mov(thread, rax);

    95        pop(rax);

    96    }

    97 }

    98 #endif

src/os_cpu/windows_x86/vm/assembler_windows_x86.cpp@c18cbe5936b8