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