1 /* 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP 27 #define OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP 28 29 private: 30 ZeroStack _zero_stack; 31 ZeroFrame* _top_zero_frame; 32 33 void pd_initialize() { 34 _top_zero_frame = NULL; 35 } 36 37 public: 38 ZeroStack *zero_stack() { 39 return &_zero_stack; 40 } 41 42 public: 43 ZeroFrame *top_zero_frame() { 44 return _top_zero_frame; 45 } 46 void push_zero_frame(ZeroFrame *frame) { 47 *(ZeroFrame **) frame = _top_zero_frame; 48 _top_zero_frame = frame; 49 } 50 void pop_zero_frame() { 51 zero_stack()->set_sp((intptr_t *) _top_zero_frame + 1); 52 _top_zero_frame = *(ZeroFrame **) _top_zero_frame; 53 } 54 55 public: 56 static ByteSize zero_stack_offset() { 57 return byte_offset_of(JavaThread, _zero_stack); 58 } 59 static ByteSize top_zero_frame_offset() { 60 return byte_offset_of(JavaThread, _top_zero_frame); 61 } 62 63 public: 64 void record_base_of_stack_pointer() { 65 assert(top_zero_frame() == NULL, "junk on stack prior to Java call"); 66 } 67 void set_base_of_stack_pointer(intptr_t* base_sp) { 68 assert(base_sp == NULL, "should be"); 69 assert(top_zero_frame() == NULL, "junk on stack after Java call"); 70 } 71 72 public: 73 void set_last_Java_frame() { 74 set_last_Java_frame(top_zero_frame(), zero_stack()->sp()); 75 } 76 void reset_last_Java_frame() { 77 frame_anchor()->zap(); 78 } 79 void set_last_Java_frame(ZeroFrame* fp, intptr_t* sp) { 80 frame_anchor()->set(sp, NULL, fp); 81 } 82 83 public: 84 ZeroFrame* last_Java_fp() { 85 return frame_anchor()->last_Java_fp(); 86 } 87 88 private: 89 frame pd_last_frame() { 90 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended"); 91 return frame(last_Java_fp(), last_Java_sp()); 92 } 93 94 public: 95 static ByteSize last_Java_fp_offset() { 96 return byte_offset_of(JavaThread, _anchor) + 97 JavaFrameAnchor::last_Java_fp_offset(); 98 } 99 100 public: 101 // Check for pending suspend requests and pending asynchronous 102 // exceptions. There are separate accessors for these, but 103 // _suspend_flags is volatile so using them would be unsafe. 104 bool has_special_condition_for_native_trans() { 105 return _suspend_flags != 0; 106 } 107 108 public: 109 bool pd_get_top_frame_for_signal_handler(frame* fr_addr, 110 void* ucontext, 111 bool isInJava) { 112 ShouldNotCallThis(); 113 } 114 115 // These routines are only used on cpu architectures that 116 // have separate register stacks (Itanium). 117 static bool register_stack_overflow() { return false; } 118 static void enable_register_stack_guard() {} 119 static void disable_register_stack_guard() {} 120 121 #endif // OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP