1 // Copyright (C) 2012 The Android Open Source Project 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions 6 // are met: 7 // 1. Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // 2. Redistributions in binary form must reproduce the above copyright 10 // notice, this list of conditions and the following disclaimer in the 11 // documentation and/or other materials provided with the distribution. 12 // 3. Neither the name of the project nor the names of its contributors 13 // may be used to endorse or promote products derived from this software 14 // without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 17 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 // ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 // SUCH DAMAGE. 27 //===----------------------------------------------------------------------===// 28 // 29 // The LLVM Compiler Infrastructure 30 // 31 // This file is dual licensed under the MIT and the University of Illinois Open 32 // Source Licenses. See LICENSE.TXT for details. 33 // 34 // 35 // This file implements the "Exception Handling APIs" 36 // http://www.codesourcery.com/public/cxx-abi/abi-eh.html 37 // http://www.intel.com/design/itanium/downloads/245358.htm 38 // 39 //===----------------------------------------------------------------------===// 40 41 #include <cassert> 42 #include <cstdlib> 43 #include <cxxabi.h> 44 #include <exception> 45 #include <unwind.h> 46 #include <typeinfo> 47 #include "dwarf_helper.h" 48 #include "helper_func_internal.h" 49 50 51 namespace __cxxabiv1 { 52 53 /* 54 * Personality Routine 55 */ 56 extern "C" _Unwind_Reason_Code BEGIN_DEFINE_PERSONALITY_FUNC 57 if (version != 1 || unwind_exception == 0 || context == 0) { 58 return _URC_FATAL_PHASE1_ERROR; 59 } 60 61 bool native_exception = exceptionClass == __gxx_exception_class; 62 ScanResultInternal results; 63 64 /* 65 * Phase 1: Search 66 */ 67 if (actions & _UA_SEARCH_PHASE) { 68 scanEHTable(results, actions, native_exception, unwind_exception, context); 69 if (results.reason == _URC_HANDLER_FOUND) { 70 // Found one. Cache result for phase 2. 71 if (native_exception) { 72 __cxa_exception* exception_header = reinterpret_cast<__cxa_exception*>(unwind_exception+1)-1; 73 exception_header->handlerSwitchValue = static_cast<int>(results.ttypeIndex); 74 exception_header->actionRecord = results.actionRecord; 75 exception_header->languageSpecificData = results.languageSpecificData; 76 exception_header->catchTemp = reinterpret_cast<void*>(results.landingPad); 77 exception_header->adjustedPtr = results.adjustedPtr; 78 saveDataToBarrierCache(unwind_exception, context, results); 79 } 80 return _URC_HANDLER_FOUND; 81 } 82 return continueUnwinding(unwind_exception, context); 83 } 84 85 /* 86 * Phase 2: Cleanup 87 */ 88 if (actions & _UA_CLEANUP_PHASE) { 89 if (actions & _UA_HANDLER_FRAME) { 90 if (native_exception) { 91 // We have cached on phase 1. Just recall that. 92 __cxa_exception* exception_header = reinterpret_cast<__cxa_exception*>(unwind_exception+1)-1; 93 results.ttypeIndex = exception_header->handlerSwitchValue; 94 results.actionRecord = exception_header->actionRecord; 95 results.languageSpecificData = exception_header->languageSpecificData; 96 results.landingPad = reinterpret_cast<uintptr_t>(exception_header->catchTemp); 97 results.adjustedPtr = exception_header->adjustedPtr; 98 loadDataFromBarrierCache(unwind_exception, results); 99 } else { 100 scanEHTable(results, actions, native_exception, unwind_exception, context); 101 102 if (results.reason != _URC_HANDLER_FOUND) 103 call_terminate(unwind_exception); 104 } 105 106 setRegisters(unwind_exception, context, results); 107 saveUnexpectedDataToBarrierCache(unwind_exception, 108 context, 109 results); 110 return _URC_INSTALL_CONTEXT; 111 } 112 113 // Force unwinding or no handler found 114 scanEHTable(results, actions, native_exception, unwind_exception, context); 115 if (results.reason == _URC_HANDLER_FOUND) { 116 // Found a non-catching handler. Jump to it. 117 setRegisters(unwind_exception, context, results); 118 prepareBeginCleanup(unwind_exception); 119 return _URC_INSTALL_CONTEXT; 120 } 121 return continueUnwinding(unwind_exception, context); 122 } 123 124 // Why here? Neither phase 1 nor 2. 125 return _URC_FATAL_PHASE1_ERROR; 126 } 127 128 } // namespace __cxxabiv1 129