1b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik//===--------------------------- Unwind-sjlj.c ----------------------------===// 2b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 3b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// The LLVM Compiler Infrastructure 4b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 5b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// This file is dual licensed under the MIT and the University of Illinois Open 6b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// Source Licenses. See LICENSE.TXT for details. 7b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 8b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 9b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// Implements setjump-longjump based C++ exceptions 10b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 11b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik//===----------------------------------------------------------------------===// 12b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 13b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik#include <unwind.h> 14b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 15b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik#include <stdint.h> 16b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik#include <stdbool.h> 17b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik#include <stdlib.h> 18b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 19b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik#include "config.h" 20b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik#include "unwind_ext.h" 21b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 22b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 23b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 32-bit iOS uses setjump/longjump based C++ exceptions. 24b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// Other architectures use "zero cost" exceptions. 25b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 26b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// With SJLJ based exceptions, any function that has a catch clause or needs to 27b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// do any clean up when an exception propagates through it, needs to call 28b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// _Unwind_SjLj_Register() at the start of the function and 29b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// _Unwind_SjLj_Unregister() at the end. The register function is called with 30b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// the address of a block of memory in the function's stack frame. The runtime 31b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// keeps a linked list (stack) of these blocks - one per thread. The calling 32b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// function also sets the personality and lsda fields of the block. 33b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik// 34b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 35b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik#if _LIBUNWIND_BUILD_SJLJ_APIS 36b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 37b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzikstruct _Unwind_FunctionContext { 38b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // next function in stack of handlers 39b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik struct _Unwind_FunctionContext *prev; 40b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 41b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // set by calling function before registering to be the landing pad 42b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik uintptr_t resumeLocation; 43b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 44b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // set by personality handler to be parameters passed to landing pad function 45b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik uintptr_t resumeParameters[4]; 46b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 47b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // set by calling function before registering 48b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik __personality_routine personality; // arm offset=24 49b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik uintptr_t lsda; // arm offset=28 50b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 51b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // variable length array, contains registers to restore 52b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // 0 = r7, 1 = pc, 2 = sp 53b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik void *jbuf[]; 54b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik}; 55b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 56b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 57b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called at start of each function that catches exceptions 58b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT void 59b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_SjLj_Register(struct _Unwind_FunctionContext *fc) { 60b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik fc->prev = __Unwind_SjLj_GetTopOfFunctionStack(); 61b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik __Unwind_SjLj_SetTopOfFunctionStack(fc); 62b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 63b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 64b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 65b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called at end of each function that catches exceptions 66b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT void 67b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_SjLj_Unregister(struct _Unwind_FunctionContext *fc) { 68b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik __Unwind_SjLj_SetTopOfFunctionStack(fc->prev); 69b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 70b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 71b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 72b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzikstatic _Unwind_Reason_Code 73b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzikunwind_phase1(struct _Unwind_Exception *exception_object) { 74b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t c = __Unwind_SjLj_GetTopOfFunctionStack(); 75b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase1: initial function-context=%p\n", c); 76b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 77b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // walk each frame looking for a place to stop 78b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik for (bool handlerNotFound = true; handlerNotFound; c = c->prev) { 79b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 80b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // check for no more frames 81b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (c == NULL) { 82b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): reached " 83b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "bottom => _URC_END_OF_STACK\n", 84b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 85b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_END_OF_STACK; 86b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 87b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 88b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase1: function-context=%p\n", c); 89b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // if there is a personality routine, ask it if it will want to stop at this 90b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // frame 91b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (c->personality != NULL) { 92b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): calling " 93b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "personality function %p\n", 94b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, c->personality); 95b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Reason_Code personalityResult = (*c->personality)( 96b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 1, _UA_SEARCH_PHASE, exception_object->exception_class, 97b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, (struct _Unwind_Context *)c); 98b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik switch (personalityResult) { 99b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik case _URC_HANDLER_FOUND: 100b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // found a catch clause or locals that need destructing in this frame 101b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // stop search and remember function context 102b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik handlerNotFound = false; 103b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object->private_2 = (uintptr_t) c; 104b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): " 105b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "_URC_HANDLER_FOUND\n", exception_object); 106b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_NO_REASON; 107b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 108b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik case _URC_CONTINUE_UNWIND: 109b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): " 110b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "_URC_CONTINUE_UNWIND\n", exception_object); 111b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // continue unwinding 112b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik break; 113b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 114b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik default: 115b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // something went wrong 116b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING( 117b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "unwind_phase1(ex_ojb=%p): _URC_FATAL_PHASE1_ERROR\n", 118b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 119b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_FATAL_PHASE1_ERROR; 120b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 121b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 122b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 123b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_NO_REASON; 124b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 125b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 126b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 127b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzikstatic _Unwind_Reason_Code 128b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzikunwind_phase2(struct _Unwind_Exception *exception_object) { 129b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p)\n", exception_object); 130b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 131b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // walk each frame until we reach where search phase said to stop 132b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t c = __Unwind_SjLj_GetTopOfFunctionStack(); 133b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik while (true) { 134b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2s(ex_ojb=%p): context=%p\n", 135b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, c); 136b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 137b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // check for no more frames 138b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (c == NULL) { 139b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached " 140b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "bottom => _URC_END_OF_STACK\n", 141b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 142b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_END_OF_STACK; 143b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 144b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 145b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // if there is a personality routine, tell it we are unwinding 146b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (c->personality != NULL) { 147b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Action action = _UA_CLEANUP_PHASE; 148b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if ((uintptr_t) c == exception_object->private_2) 149b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik action = (_Unwind_Action)( 150b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _UA_CLEANUP_PHASE | 151b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _UA_HANDLER_FRAME); // tell personality this was the frame it marked 152b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // in phase 1 153b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Reason_Code personalityResult = 154b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (*c->personality)(1, action, exception_object->exception_class, 155b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, (struct _Unwind_Context *)c); 156b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik switch (personalityResult) { 157b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik case _URC_CONTINUE_UNWIND: 158b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // continue unwinding 159b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING( 160b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "unwind_phase2(ex_ojb=%p): _URC_CONTINUE_UNWIND\n", 161b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 162b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if ((uintptr_t) c == exception_object->private_2) { 163b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // phase 1 said we would stop at this frame, but we did not... 164b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_ABORT("during phase1 personality function said it would " 165b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "stop here, but now if phase2 it did not stop here"); 166b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 167b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik break; 168b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik case _URC_INSTALL_CONTEXT: 169b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): " 170b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "_URC_INSTALL_CONTEXT, will resume at " 171b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "landing pad %p\n", 172b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, c->jbuf[1]); 173b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // personality routine says to transfer control to landing pad 174b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // we may get control back if landing pad calls _Unwind_Resume() 175b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik __Unwind_SjLj_SetTopOfFunctionStack(c); 176b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik __builtin_longjmp(c->jbuf, 1); 177b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // unw_resume() only returns if there was an error 178b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_FATAL_PHASE2_ERROR; 179b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik default: 180b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // something went wrong 181b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_DEBUG_LOG("personality function returned unknown result %d", 182b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik personalityResult); 183b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_FATAL_PHASE2_ERROR; 184b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 185b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 186b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik c = c->prev; 187b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 188b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 189b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // clean up phase did not resume at the frame that the search phase said it 190b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // would 191b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_FATAL_PHASE2_ERROR; 192b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 193b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 194b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 195b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzikstatic _Unwind_Reason_Code 196b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzikunwind_phase2_forced(struct _Unwind_Exception *exception_object, 197b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Stop_Fn stop, void *stop_parameter) { 198b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // walk each frame until we reach where search phase said to stop 199b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t c = __Unwind_SjLj_GetTopOfFunctionStack(); 200b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik while (true) { 201b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 202b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // get next frame (skip over first which is _Unwind_RaiseException) 203b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (c == NULL) { 204b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached " 205b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "bottom => _URC_END_OF_STACK\n", 206b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 207b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_END_OF_STACK; 208b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 209b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 210b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // call stop function at each frame 211b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Action action = 212b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE); 213b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Reason_Code stopResult = 214b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (*stop)(1, action, exception_object->exception_class, exception_object, 215b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (struct _Unwind_Context *)c, stop_parameter); 216b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 217b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "stop function returned %d\n", 218b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, stopResult); 219b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (stopResult != _URC_NO_REASON) { 220b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 221b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "stopped by stop function\n", 222b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 223b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_FATAL_PHASE2_ERROR; 224b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 225b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 226b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // if there is a personality routine, tell it we are unwinding 227b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (c->personality != NULL) { 228b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik __personality_routine p = (__personality_routine) c->personality; 229b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 230b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "calling personality function %p\n", 231b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, p); 232b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Reason_Code personalityResult = 233b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (*p)(1, action, exception_object->exception_class, exception_object, 234b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (struct _Unwind_Context *)c); 235b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik switch (personalityResult) { 236b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik case _URC_CONTINUE_UNWIND: 237b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 238b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "personality returned _URC_CONTINUE_UNWIND\n", 239b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 240b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // destructors called, continue unwinding 241b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik break; 242b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik case _URC_INSTALL_CONTEXT: 243b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 244b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "personality returned _URC_INSTALL_CONTEXT\n", 245b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 246b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // we may get control back if landing pad calls _Unwind_Resume() 247b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik __Unwind_SjLj_SetTopOfFunctionStack(c); 248b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik __builtin_longjmp(c->jbuf, 1); 249b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik break; 250b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik default: 251b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // something went wrong 252b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): " 253b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "personality returned %d, " 254b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "_URC_FATAL_PHASE2_ERROR\n", 255b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, personalityResult); 256b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_FATAL_PHASE2_ERROR; 257b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 258b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 259b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik c = c->prev; 260b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 261b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 262b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // call stop function one last time and tell it we've reached the end of the 263b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // stack 264b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): calling stop " 265b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "function with _UA_END_OF_STACK\n", 266b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 267b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Action lastAction = 268b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE | _UA_END_OF_STACK); 269b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (*stop)(1, lastAction, exception_object->exception_class, exception_object, 270b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (struct _Unwind_Context *)c, stop_parameter); 271b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 272b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // clean up phase did not resume at the frame that the search phase said it 273b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // would 274b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _URC_FATAL_PHASE2_ERROR; 275b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 276b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 277b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 278b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by __cxa_throw. Only returns if there is a fatal error 279b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT _Unwind_Reason_Code 280b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_SjLj_RaiseException(struct _Unwind_Exception *exception_object) { 281b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_SjLj_RaiseException(ex_obj=%p)\n", exception_object); 282b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 283b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // mark that this is a non-forced unwind, so _Unwind_Resume() can do the right 284b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // thing 285b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object->private_1 = 0; 286b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object->private_2 = 0; 287b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 288b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // phase 1: the search phase 289b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_Reason_Code phase1 = unwind_phase1(exception_object); 290b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (phase1 != _URC_NO_REASON) 291b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return phase1; 292b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 293b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // phase 2: the clean up phase 294b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return unwind_phase2(exception_object); 295b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 296b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 297b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 298b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 299b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// When _Unwind_RaiseException() is in phase2, it hands control 300b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// to the personality function at each frame. The personality 301b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// may force a jump to a landing pad in that function, the landing 302b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// pad code may then call _Unwind_Resume() to continue with the 303b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// unwinding. Note: the call to _Unwind_Resume() is from compiler 304b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// geneated user code. All other _Unwind_* routines are called 305b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// by the C++ runtime __cxa_* routines. 306b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// 307b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Re-throwing an exception is implemented by having the code call 308b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// __cxa_rethrow() which in turn calls _Unwind_Resume_or_Rethrow() 309b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT void 310b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_SjLj_Resume(struct _Unwind_Exception *exception_object) { 311b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_SjLj_Resume(ex_obj=%p)\n", exception_object); 312b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 313b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (exception_object->private_1 != 0) 314b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik unwind_phase2_forced(exception_object, 315b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (_Unwind_Stop_Fn) exception_object->private_1, 316b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (void *)exception_object->private_2); 317b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik else 318b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik unwind_phase2(exception_object); 319b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 320b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // clients assume _Unwind_Resume() does not return, so all we can do is abort. 321b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_ABORT("_Unwind_SjLj_Resume() can't return"); 322b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 323b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 324b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 325b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by __cxa_rethrow(). 326b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT _Unwind_Reason_Code 327b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_SjLj_Resume_or_Rethrow(struct _Unwind_Exception *exception_object) { 328b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("__Unwind_SjLj_Resume_or_Rethrow(ex_obj=%p), " 329b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "private_1=%ld\n", 330b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object, exception_object->private_1); 331b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // If this is non-forced and a stopping place was found, then this is a 332b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // re-throw. 333b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // Call _Unwind_RaiseException() as if this was a new exception. 334b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (exception_object->private_1 == 0) { 335b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return _Unwind_SjLj_RaiseException(exception_object); 336b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // should return if there is no catch clause, so that __cxa_rethrow can call 337b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // std::terminate() 338b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 339b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 340b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // Call through to _Unwind_Resume() which distiguishes between forced and 341b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // regular exceptions. 342b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_SjLj_Resume(exception_object); 343b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_ABORT("__Unwind_SjLj_Resume_or_Rethrow() called " 344b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "_Unwind_SjLj_Resume() which unexpectedly returned"); 345b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 346b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 347b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 348b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to get LSDA for current frame. 349b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT uintptr_t 350b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) { 351b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context; 352b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_GetLanguageSpecificData(context=%p) " 353b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik "=> 0x%0lX\n", context, ufc->lsda); 354b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return ufc->lsda; 355b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 356b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 357b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 358b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to get register values. 359b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT uintptr_t _Unwind_GetGR(struct _Unwind_Context *context, 360b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik int index) { 361b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_GetGR(context=%p, reg=%d)\n", 362b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik context, index); 363b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context; 364b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return ufc->resumeParameters[index]; 365b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 366b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 367b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 368b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to alter register values. 369b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT void _Unwind_SetGR(struct _Unwind_Context *context, int index, 370b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik uintptr_t new_value) { 371b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_SetGR(context=%p, reg=%d, value=0x%0lX)\n" 372b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik , context, index, new_value); 373b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context; 374b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik ufc->resumeParameters[index] = new_value; 375b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 376b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 377b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 378b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to get instruction pointer. 379b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) { 380b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context; 381b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_GetIP(context=%p) => 0x%lX\n", context, 382b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik ufc->resumeLocation + 1); 383b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return ufc->resumeLocation + 1; 384b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 385b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 386b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 387b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to get instruction pointer. 388b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// ipBefore is a boolean that says if IP is already adjusted to be the call 389b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// site address. Normally IP is the return address. 390b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context *context, 391b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik int *ipBefore) { 392b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context; 393b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik *ipBefore = 0; 394b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_GetIPInfo(context=%p, %p) => 0x%lX\n", 395b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik context, ipBefore, ufc->resumeLocation + 1); 396b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return ufc->resumeLocation + 1; 397b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 398b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 399b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 400b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to alter instruction pointer. 401b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT void _Unwind_SetIP(struct _Unwind_Context *context, 402b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik uintptr_t new_value) { 403b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_SetIP(context=%p, value=0x%0lX)\n", 404b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik context, new_value); 405b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context; 406b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik ufc->resumeLocation = new_value - 1; 407b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 408b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 409b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 410b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to find the start of the 411b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// function. 412b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT uintptr_t 413b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_GetRegionStart(struct _Unwind_Context *context) { 414b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // Not supported or needed for sjlj based unwinding 415b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (void)context; 416b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p)\n", context); 417b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return 0; 418b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 419b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 420b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 421b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 if a foreign exception 422b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// is caught. 423b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT void 424b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_DeleteException(struct _Unwind_Exception *exception_object) { 425b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_DeleteException(ex_obj=%p)\n", 426b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 427b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (exception_object->exception_cleanup != NULL) 428b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (*exception_object->exception_cleanup)(_URC_FOREIGN_EXCEPTION_CAUGHT, 429b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik exception_object); 430b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 431b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 432b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 433b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 434b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to get base address for data 435b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// relative encodings. 436b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT uintptr_t 437b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_GetDataRelBase(struct _Unwind_Context *context) { 438b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // Not supported or needed for sjlj based unwinding 439b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (void)context; 440b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_GetDataRelBase(context=%p)\n", context); 441b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_ABORT("_Unwind_GetDataRelBase() not implemented"); 442b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 443b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 444b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 445b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler during phase 2 to get base address for text 446b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// relative encodings. 447b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT uintptr_t 448b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_Unwind_GetTextRelBase(struct _Unwind_Context *context) { 449b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // Not supported or needed for sjlj based unwinding 450b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik (void)context; 451b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_GetTextRelBase(context=%p)\n", context); 452b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_ABORT("_Unwind_GetTextRelBase() not implemented"); 453b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 454b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 455b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 456b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik/// Called by personality handler to get "Call Frame Area" for current frame. 457b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik_LIBUNWIND_EXPORT uintptr_t _Unwind_GetCFA(struct _Unwind_Context *context) { 458b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _LIBUNWIND_TRACE_API("_Unwind_GetCFA(context=%p)\n", context); 459b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik if (context != NULL) { 460b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context; 461b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // Setjmp/longjmp based exceptions don't have a true CFA. 462b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik // Instead, the SP in the jmpbuf is the closest approximation. 463b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return (uintptr_t) ufc->jbuf[2]; 464b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik } 465b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik return 0; 466b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik} 467b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik 468b78da9875b6e35187b5d584746c78faaf3230a3dNick Kledzik#endif // _LIBUNWIND_BUILD_SJLJ_APIS 469