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3960
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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_BSD_ZERO_VM_THREAD_BSD_ZERO_HPP
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27 #define OS_CPU_BSD_ZERO_VM_THREAD_BSD_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_BSD_ZERO_VM_THREAD_BSD_ZERO_HPP
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