jdk8-mips64-public/hotspot: src/os_cpu/linux_x86/vm/thread_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) 2000, 2013, 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 #ifndef OS_CPU_LINUX_X86_VM_THREAD_LINUX_X86_HPP

    26 #define OS_CPU_LINUX_X86_VM_THREAD_LINUX_X86_HPP

    28  private:

    29   void pd_initialize() {

    30     _anchor.clear();

    31   }

    33   frame pd_last_frame() {

    34     assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");

    35     if (_anchor.last_Java_pc() != NULL) {

    36       return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());

    37     } else {

    38       // This will pick up pc from sp

    39       return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp());

    40     }

    41   }

    43  public:

    44   // Mutators are highly dangerous....

    45   intptr_t* last_Java_fp()                       { return _anchor.last_Java_fp(); }

    46   void  set_last_Java_fp(intptr_t* fp)           { _anchor.set_last_Java_fp(fp);   }

    48   void set_base_of_stack_pointer(intptr_t* base_sp) {

    49   }

    51   static ByteSize last_Java_fp_offset()          {

    52     return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_fp_offset();

    53   }

    55   intptr_t* base_of_stack_pointer() {

    56     return NULL;

    57   }

    58   void record_base_of_stack_pointer() {

    59   }

    61   bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,

    62     bool isInJava);

    64   bool pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava);

    65 private:

    66   bool pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava);

    67 public:

    69   // These routines are only used on cpu architectures that

    70   // have separate register stacks (Itanium).

    71   static bool register_stack_overflow() { return false; }

    72   static void enable_register_stack_guard() {}

    73   static void disable_register_stack_guard() {}

    75 #endif // OS_CPU_LINUX_X86_VM_THREAD_LINUX_X86_HPP

src/os_cpu/linux_x86/vm/thread_linux_x86.hpp@899ecf76b570

src/os_cpu/linux_x86/vm/thread_linux_x86.hpp

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

src/os_cpu/linux_x86/vm/thread_linux_x86.hpp@899ecf76b570

src/os_cpu/linux_x86/vm/thread_linux_x86.hpp