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

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

     1 /*

     2  * Copyright (c) 1999, 2010, 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 "precompiled.hpp"

    26 #include "asm/macroAssembler.hpp"

    27 #include "asm/macroAssembler.inline.hpp"

    28 #include "runtime/os.hpp"

    29 #include "runtime/threadLocalStorage.hpp"

    32 void MacroAssembler::int3() {

    33   emit_int8((unsigned char)0xCC);

    34 }

    36 #ifndef _LP64

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

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

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

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

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

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

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

    44 //

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

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

    47 //  evolved the OS.

    48 //

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

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

    51 //

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

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

    54 //

    55 void MacroAssembler::get_thread(Register thread) {

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

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

    59   prefix(FS_segment);

    60   movptr(thread, null);

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

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

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

    64 }

    65 #else

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

    67 void MacroAssembler::get_thread(Register thread) {

    68    if (thread != rax) {

    69      push(rax);

    70    }

    71    push(rdi);

    72    push(rsi);

    73    push(rdx);

    74    push(rcx);

    75    push(r8);

    76    push(r9);

    77    push(r10);

    78    // XXX

    79    mov(r10, rsp);

    80    andq(rsp, -16);

    81    push(r10);

    82    push(r11);

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

    85    call(RuntimeAddress((address)TlsGetValue));

    87    pop(r11);

    88    pop(rsp);

    89    pop(r10);

    90    pop(r9);

    91    pop(r8);

    92    pop(rcx);

    93    pop(rdx);

    94    pop(rsi);

    95    pop(rdi);

    96    if (thread != rax) {

    97        mov(thread, rax);

    98        pop(rax);

    99    }

   100 }

   101 #endif

src/os_cpu/windows_x86/vm/assembler_windows_x86.cpp@f90c822e73f8