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1 /*
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2 * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_thread_solaris_sparc.cpp.incl"
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27
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28 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is
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29 // currently interrupted by SIGPROF
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30 //
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31 // NOTE: On Solaris, register windows are flushed in the signal handler
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32 // except for possibly the top frame.
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33 //
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34 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
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35 void* ucontext, bool isInJava) {
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36
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37 assert(Thread::current() == this, "caller must be current thread");
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38 assert(this->is_Java_thread(), "must be JavaThread");
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39
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40 JavaThread* jt = (JavaThread *)this;
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41
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42 if (!isInJava) {
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43 // make_walkable flushes register windows and grabs last_Java_pc
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44 // which can not be done if the ucontext sp matches last_Java_sp
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45 // stack walking utilities assume last_Java_pc set if marked flushed
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46 jt->frame_anchor()->make_walkable(jt);
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47 }
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48
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49 // If we have a walkable last_Java_frame, then we should use it
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50 // even if isInJava == true. It should be more reliable than
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51 // ucontext info.
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52 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
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53 #if 0
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54 // This sanity check may not be needed with the new frame
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55 // walking code. Remove it for now.
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56 if (!jt->frame_anchor()->post_Java_state_is_pc()
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57 && frame::next_younger_sp_or_null(last_Java_sp(),
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58 jt->frame_anchor()->post_Java_sp()) == NULL) {
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59 // the anchor contains an SP, but the frame is not walkable
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60 // because post_Java_sp isn't valid relative to last_Java_sp
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61 return false;
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62 }
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63 #endif
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64 *fr_addr = jt->pd_last_frame();
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65 return true;
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66 }
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67
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68 ucontext_t* uc = (ucontext_t*) ucontext;
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69
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70 // At this point, we don't have a walkable last_Java_frame, so
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71 // we try to glean some information out of the ucontext.
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72 intptr_t* ret_sp;
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73 ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc,
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74 &ret_sp, NULL /* ret_fp only used on Solaris X86 */);
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75 if (addr.pc() == NULL || ret_sp == NULL) {
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76 // ucontext wasn't useful
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77 return false;
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78 }
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79
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80 // we were running Java code when SIGPROF came in
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81 if (isInJava) {
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82 // If we have a last_Java_sp, then the SIGPROF signal caught us
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83 // right when we were transitioning from _thread_in_Java to a new
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84 // JavaThreadState. We use last_Java_sp instead of the sp from
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85 // the ucontext since it should be more reliable.
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86 if (jt->has_last_Java_frame()) {
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87 ret_sp = jt->last_Java_sp();
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88 }
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89 // Implied else: we don't have a last_Java_sp so we use what we
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90 // got from the ucontext.
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91
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92 frame ret_frame(ret_sp, frame::unpatchable, addr.pc());
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93 if (!ret_frame.safe_for_sender(jt)) {
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94 // nothing else to try if the frame isn't good
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95 return false;
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96 }
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97 *fr_addr = ret_frame;
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98 return true;
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99 }
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100
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101 // At this point, we know we weren't running Java code. We might
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102 // have a last_Java_sp, but we don't have a walkable frame.
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103 // However, we might still be able to construct something useful
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104 // if the thread was running native code.
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105 if (jt->has_last_Java_frame()) {
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106 assert(!jt->frame_anchor()->walkable(), "case covered above");
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107
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108 if (jt->thread_state() == _thread_in_native) {
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109 frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());
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110 if (!ret_frame.safe_for_sender(jt)) {
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111 // nothing else to try if the frame isn't good
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112 return false;
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113 }
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114 *fr_addr = ret_frame;
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115 return true;
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116 }
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117 }
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118
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119 // nothing else to try
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120 return false;
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121 }
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