1 /* libunwind - a platform-independent unwind library 2 Copyright (C) 2003, 2005 Hewlett-Packard Co 3 Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com> 4 5 This file is part of libunwind. 6 7 Permission is hereby granted, free of charge, to any person obtaining 8 a copy of this software and associated documentation files (the 9 "Software"), to deal in the Software without restriction, including 10 without limitation the rights to use, copy, modify, merge, publish, 11 distribute, sublicense, and/or sell copies of the Software, and to 12 permit persons to whom the Software is furnished to do so, subject to 13 the following conditions: 14 15 The above copyright notice and this permission notice shall be 16 included in all copies or substantial portions of the Software. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 25 26 #ifndef unwind_internal_h 27 #define unwind_internal_h 28 29 #define UNW_LOCAL_ONLY 30 31 #include <unwind.h> 32 #include <stdlib.h> 33 #include <libunwind.h> 34 35 #include "libunwind_i.h" 36 37 /* The version of the _Unwind_*() interface implemented by this code. */ 38 #define _U_VERSION 1 39 40 typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn) 41 (int, _Unwind_Action, uint64_t, struct _Unwind_Exception *, 42 struct _Unwind_Context *); 43 44 struct _Unwind_Context { 45 unw_cursor_t cursor; 46 int end_of_stack; /* set to 1 if the end of stack was reached */ 47 }; 48 49 /* This must be a macro because unw_getcontext() must be invoked from 50 the callee, even if optimization (and hence inlining) is turned 51 off. The macro arguments MUST NOT have any side-effects. */ 52 #define _Unwind_InitContext(context, uc) \ 53 ((context)->end_of_stack = 0, \ 54 ((unw_getcontext (uc) < 0 || unw_init_local (&(context)->cursor, uc) < 0) \ 55 ? -1 : 0)) 56 57 static _Unwind_Reason_Code ALWAYS_INLINE 58 _Unwind_Phase2 (struct _Unwind_Exception *exception_object, 59 struct _Unwind_Context *context, 60 /* ANDROID support update. */ 61 int *destroy_map) 62 /* End of ANDROID update. */ 63 { 64 _Unwind_Stop_Fn stop = (_Unwind_Stop_Fn) exception_object->private_1; 65 uint64_t exception_class = exception_object->exception_class; 66 void *stop_parameter = (void *) exception_object->private_2; 67 _Unwind_Personality_Fn personality; 68 _Unwind_Reason_Code reason; 69 _Unwind_Action actions; 70 unw_proc_info_t pi; 71 unw_word_t ip; 72 int ret; 73 74 /* ANDROID support update. */ 75 *destroy_map = 1; 76 /* End of ANDROID update. */ 77 78 actions = _UA_CLEANUP_PHASE; 79 if (stop) 80 actions |= _UA_FORCE_UNWIND; 81 82 while (1) 83 { 84 ret = unw_step (&context->cursor); 85 if (ret <= 0) 86 { 87 /* ANDROID support update. */ 88 /* Treat any stop as end of stack. */ 89 actions |= _UA_END_OF_STACK; 90 context->end_of_stack = 1; 91 /* End of ANDROID support. */ 92 } 93 94 if (stop) 95 { 96 /* ANDROID support update. */ 97 /* The stop function might not return, so free any local map. */ 98 unw_map_local_destroy (); 99 /* End of ANDROID support. */ 100 reason = (*stop) (_U_VERSION, actions, exception_class, 101 exception_object, context, stop_parameter); 102 if (reason != _URC_NO_REASON) 103 { 104 /* Stop function may return _URC_FATAL_PHASE2_ERROR if 105 it's unable to handle end-of-stack condition or 106 _URC_FATAL_PHASE2_ERROR if something is wrong. Not 107 that it matters: the resulting state is indeterminate 108 anyhow so we must return _URC_FATAL_PHASE2_ERROR... */ 109 *destroy_map = 0; 110 return _URC_FATAL_PHASE2_ERROR; 111 } 112 /* ANDROID support update. */ 113 unw_map_local_create (); 114 /* End of ANDROID support. */ 115 } 116 117 if (context->end_of_stack 118 || unw_get_proc_info (&context->cursor, &pi) < 0) 119 return _URC_FATAL_PHASE2_ERROR; 120 121 personality = (_Unwind_Personality_Fn) (uintptr_t) pi.handler; 122 if (personality) 123 { 124 if (!stop) 125 { 126 if (unw_get_reg (&context->cursor, UNW_REG_IP, &ip) < 0) 127 return _URC_FATAL_PHASE2_ERROR; 128 129 if ((unsigned long) stop_parameter == ip) 130 actions |= _UA_HANDLER_FRAME; 131 } 132 133 reason = (*personality) (_U_VERSION, actions, exception_class, 134 exception_object, context); 135 if (reason != _URC_CONTINUE_UNWIND) 136 { 137 if (reason == _URC_INSTALL_CONTEXT) 138 { 139 /* we may regain control via _Unwind_Resume() */ 140 unw_resume (&context->cursor); 141 abort (); 142 } 143 else 144 return _URC_FATAL_PHASE2_ERROR; 145 } 146 if (actions & _UA_HANDLER_FRAME) 147 /* The personality routine for the handler-frame changed 148 it's mind; that's a no-no... */ 149 abort (); 150 } 151 } 152 return _URC_FATAL_PHASE2_ERROR; /* shouldn't be reached */ 153 } 154 155 #endif /* unwind_internal_h */ 156
