aoqi@0: /*
aoqi@0:  * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP
aoqi@0: #define OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP
aoqi@0: 
aoqi@0:  private:
aoqi@0:   ZeroStack  _zero_stack;
aoqi@0:   ZeroFrame* _top_zero_frame;
aoqi@0: 
aoqi@0:   void pd_initialize() {
aoqi@0:     _top_zero_frame = NULL;
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   ZeroStack *zero_stack() {
aoqi@0:     return &_zero_stack;
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   ZeroFrame *top_zero_frame() {
aoqi@0:     return _top_zero_frame;
aoqi@0:   }
aoqi@0:   void push_zero_frame(ZeroFrame *frame) {
aoqi@0:     *(ZeroFrame **) frame = _top_zero_frame;
aoqi@0:     _top_zero_frame = frame;
aoqi@0:   }
aoqi@0:   void pop_zero_frame() {
aoqi@0:     zero_stack()->set_sp((intptr_t *) _top_zero_frame + 1);
aoqi@0:     _top_zero_frame = *(ZeroFrame **) _top_zero_frame;
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   static ByteSize zero_stack_offset() {
aoqi@0:     return byte_offset_of(JavaThread, _zero_stack);
aoqi@0:   }
aoqi@0:   static ByteSize top_zero_frame_offset() {
aoqi@0:     return byte_offset_of(JavaThread, _top_zero_frame);
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   void record_base_of_stack_pointer() {
aoqi@0:     assert(top_zero_frame() == NULL, "junk on stack prior to Java call");
aoqi@0:   }
aoqi@0:   void set_base_of_stack_pointer(intptr_t* base_sp) {
aoqi@0:     assert(base_sp == NULL, "should be");
aoqi@0:     assert(top_zero_frame() == NULL, "junk on stack after Java call");
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   void set_last_Java_frame() {
aoqi@0:     set_last_Java_frame(top_zero_frame(), zero_stack()->sp());
aoqi@0:   }
aoqi@0:   void reset_last_Java_frame() {
aoqi@0:     frame_anchor()->zap();
aoqi@0:   }
aoqi@0:   void set_last_Java_frame(ZeroFrame* fp, intptr_t* sp) {
aoqi@0:     frame_anchor()->set(sp, NULL, fp);
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   ZeroFrame* last_Java_fp() {
aoqi@0:     return frame_anchor()->last_Java_fp();
aoqi@0:   }
aoqi@0: 
aoqi@0:  private:
aoqi@0:   frame pd_last_frame() {
aoqi@0:     assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
aoqi@0:     return frame(last_Java_fp(), last_Java_sp());
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   static ByteSize last_Java_fp_offset() {
aoqi@0:     return byte_offset_of(JavaThread, _anchor) +
aoqi@0:       JavaFrameAnchor::last_Java_fp_offset();
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   // Check for pending suspend requests and pending asynchronous
aoqi@0:   // exceptions.  There are separate accessors for these, but
aoqi@0:   // _suspend_flags is volatile so using them would be unsafe.
aoqi@0:   bool has_special_condition_for_native_trans() {
aoqi@0:     return _suspend_flags != 0;
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   bool pd_get_top_frame_for_signal_handler(frame* fr_addr,
aoqi@0:                                            void* ucontext,
aoqi@0:                                            bool isInJava) {
aoqi@0:     ShouldNotCallThis();
aoqi@0:   }
aoqi@0: 
aoqi@0:   // These routines are only used on cpu architectures that
aoqi@0:   // have separate register stacks (Itanium).
aoqi@0:   static bool register_stack_overflow() { return false; }
aoqi@0:   static void enable_register_stack_guard() {}
aoqi@0:   static void disable_register_stack_guard() {}
aoqi@0: 
aoqi@0: #endif // OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP