jdk8-mips64-public/hotspot: src/os_cpu/linux_x86/vm/assembler_linux

8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
Summary: Execute some code at a high virtual address value, and keep mapped
Reviewed-by: coleenp, zgu

     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"

    31 #ifndef _LP64

    32 void MacroAssembler::int3() {

    33   call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));

    34 }

    36 #ifdef MINIMIZE_RAM_USAGE

    38 void MacroAssembler::get_thread(Register thread) {

    39   // call pthread_getspecific

    40   // void * pthread_getspecific(pthread_key_t key);

    41   if (thread != rax) push(rax);

    42   push(rcx);

    43   push(rdx);

    45   push(ThreadLocalStorage::thread_index());

    46   call(RuntimeAddress(CAST_FROM_FN_PTR(address, pthread_getspecific)));

    47   increment(rsp, wordSize);

    49   pop(rdx);

    50   pop(rcx);

    51   if (thread != rax) {

    52     mov(thread, rax);

    53     pop(rax);

    54   }

    55 }

    57 #else

    58 void MacroAssembler::get_thread(Register thread) {

    59   movl(thread, rsp);

    60   shrl(thread, PAGE_SHIFT);

    62   ExternalAddress tls_base((address)ThreadLocalStorage::sp_map_addr());

    63   Address index(noreg, thread, Address::times_4);

    64   ArrayAddress tls(tls_base, index);

    66   movptr(thread, tls);

    67 }

    68 #endif // MINIMIZE_RAM_USAGE

    69 #else

    70 void MacroAssembler::int3() {

    71   call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));

    72 }

    74 void MacroAssembler::get_thread(Register thread) {

    75   // call pthread_getspecific

    76   // void * pthread_getspecific(pthread_key_t key);

    77    if (thread != rax) {

    78      push(rax);

    79    }

    80    push(rdi);

    81    push(rsi);

    82    push(rdx);

    83    push(rcx);

    84    push(r8);

    85    push(r9);

    86    push(r10);

    87    // XXX

    88    mov(r10, rsp);

    89    andq(rsp, -16);

    90    push(r10);

    91    push(r11);

    93    movl(rdi, ThreadLocalStorage::thread_index());

    94    call(RuntimeAddress(CAST_FROM_FN_PTR(address, pthread_getspecific)));

    96    pop(r11);

    97    pop(rsp);

    98    pop(r10);

    99    pop(r9);

   100    pop(r8);

   101    pop(rcx);

   102    pop(rdx);

   103    pop(rsi);

   104    pop(rdi);

   105    if (thread != rax) {

   106        mov(thread, rax);

   107        pop(rax);

   108    }

   109 }

   110 #endif

src/os_cpu/linux_x86/vm/assembler_linux_x86.cpp@899ecf76b570

src/os_cpu/linux_x86/vm/assembler_linux_x86.cpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/os_cpu/linux_x86/vm/assembler_linux_x86.cpp@899ecf76b570

src/os_cpu/linux_x86/vm/assembler_linux_x86.cpp