| // -*- C++ -*- The GNU C++ exception personality routine. |
| // Copyright (C) 2001-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of GCC. |
| // |
| // GCC is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License as published by |
| // the Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| // |
| // GCC is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| // |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| #include <bits/c++config.h> |
| #include <cstdlib> |
| #include <bits/exception_defines.h> |
| #include <cxxabi.h> |
| #include "unwind-cxx.h" |
| |
| |
| using namespace __cxxabiv1; |
| |
| #include "unwind-pe.h" |
| |
| |
| struct lsda_header_info |
| { |
| _Unwind_Ptr Start; |
| _Unwind_Ptr LPStart; |
| _Unwind_Ptr ttype_base; |
| const unsigned char *TType; |
| const unsigned char *action_table; |
| unsigned char ttype_encoding; |
| unsigned char call_site_encoding; |
| }; |
| |
| static const unsigned char * |
| parse_lsda_header (_Unwind_Context *context, const unsigned char *p, |
| lsda_header_info *info) |
| { |
| _uleb128_t tmp; |
| unsigned char lpstart_encoding; |
| |
| info->Start = (context ? _Unwind_GetRegionStart (context) : 0); |
| |
| // Find @LPStart, the base to which landing pad offsets are relative. |
| lpstart_encoding = *p++; |
| if (lpstart_encoding != DW_EH_PE_omit) |
| p = read_encoded_value (context, lpstart_encoding, p, &info->LPStart); |
| else |
| info->LPStart = info->Start; |
| |
| // Find @TType, the base of the handler and exception spec type data. |
| info->ttype_encoding = *p++; |
| if (info->ttype_encoding != DW_EH_PE_omit) |
| { |
| #if _GLIBCXX_OVERRIDE_TTYPE_ENCODING |
| /* Older ARM EABI toolchains set this value incorrectly, so use a |
| hardcoded OS-specific format. */ |
| info->ttype_encoding = _GLIBCXX_OVERRIDE_TTYPE_ENCODING; |
| #endif |
| p = read_uleb128 (p, &tmp); |
| info->TType = p + tmp; |
| } |
| else |
| info->TType = 0; |
| |
| // The encoding and length of the call-site table; the action table |
| // immediately follows. |
| info->call_site_encoding = *p++; |
| p = read_uleb128 (p, &tmp); |
| info->action_table = p + tmp; |
| |
| return p; |
| } |
| |
| // Return an element from a type table. |
| |
| static const std::type_info * |
| get_ttype_entry (lsda_header_info *info, _uleb128_t i) |
| { |
| _Unwind_Ptr ptr; |
| |
| i *= size_of_encoded_value (info->ttype_encoding); |
| read_encoded_value_with_base ( |
| #if __FDPIC__ |
| /* Force these flags to nake sure to |
| take the GOT into account. */ |
| (DW_EH_PE_pcrel | DW_EH_PE_indirect), |
| #else |
| info->ttype_encoding, |
| #endif |
| info->ttype_base, |
| info->TType - i, &ptr); |
| |
| return reinterpret_cast<const std::type_info *>(ptr); |
| } |
| |
| #ifdef __ARM_EABI_UNWINDER__ |
| |
| // The ABI provides a routine for matching exception object types. |
| typedef _Unwind_Control_Block _throw_typet; |
| #define get_adjusted_ptr(catch_type, throw_type, thrown_ptr_p) \ |
| (__cxa_type_match (throw_type, catch_type, false, thrown_ptr_p) \ |
| != ctm_failed) |
| |
| // Return true if THROW_TYPE matches one if the filter types. |
| |
| static bool |
| check_exception_spec(lsda_header_info* info, _throw_typet* throw_type, |
| void* thrown_ptr, _sleb128_t filter_value) |
| { |
| const _uleb128_t* e = ((const _uleb128_t*) info->TType) |
| - filter_value - 1; |
| |
| while (1) |
| { |
| const std::type_info* catch_type; |
| _uleb128_t tmp; |
| |
| tmp = *e; |
| |
| // Zero signals the end of the list. If we've not found |
| // a match by now, then we've failed the specification. |
| if (tmp == 0) |
| return false; |
| |
| tmp = _Unwind_decode_typeinfo_ptr(info->ttype_base, (_Unwind_Word) e); |
| |
| // Match a ttype entry. |
| catch_type = reinterpret_cast<const std::type_info*>(tmp); |
| |
| // ??? There is currently no way to ask the RTTI code about the |
| // relationship between two types without reference to a specific |
| // object. There should be; then we wouldn't need to mess with |
| // thrown_ptr here. |
| if (get_adjusted_ptr(catch_type, throw_type, &thrown_ptr)) |
| return true; |
| |
| // Advance to the next entry. |
| e++; |
| } |
| } |
| |
| |
| // Save stage1 handler information in the exception object |
| |
| static inline void |
| save_caught_exception(struct _Unwind_Exception* ue_header, |
| struct _Unwind_Context* context, |
| void* thrown_ptr, |
| int handler_switch_value, |
| const unsigned char* language_specific_data, |
| _Unwind_Ptr landing_pad, |
| const unsigned char* action_record |
| __attribute__((__unused__))) |
| { |
| ue_header->barrier_cache.sp = _Unwind_GetGR(context, UNWIND_STACK_REG); |
| ue_header->barrier_cache.bitpattern[0] = (_uw) thrown_ptr; |
| ue_header->barrier_cache.bitpattern[1] |
| = (_uw) handler_switch_value; |
| ue_header->barrier_cache.bitpattern[2] |
| = (_uw) language_specific_data; |
| ue_header->barrier_cache.bitpattern[3] = (_uw) landing_pad; |
| } |
| |
| |
| // Restore the catch handler data saved during phase1. |
| |
| static inline void |
| restore_caught_exception(struct _Unwind_Exception* ue_header, |
| int& handler_switch_value, |
| const unsigned char*& language_specific_data, |
| _Unwind_Ptr& landing_pad) |
| { |
| handler_switch_value = (int) ue_header->barrier_cache.bitpattern[1]; |
| language_specific_data = |
| (const unsigned char*) ue_header->barrier_cache.bitpattern[2]; |
| landing_pad = (_Unwind_Ptr) ue_header->barrier_cache.bitpattern[3]; |
| } |
| |
| #define CONTINUE_UNWINDING \ |
| do \ |
| { \ |
| if (__gnu_unwind_frame(ue_header, context) != _URC_OK) \ |
| return _URC_FAILURE; \ |
| return _URC_CONTINUE_UNWIND; \ |
| } \ |
| while (0) |
| |
| // Return true if the filter spec is empty, ie throw(). |
| |
| static bool |
| empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value) |
| { |
| const _Unwind_Word* e = ((const _Unwind_Word*) info->TType) |
| - filter_value - 1; |
| |
| return *e == 0; |
| } |
| |
| #else |
| typedef const std::type_info _throw_typet; |
| |
| |
| // Given the thrown type THROW_TYPE, pointer to a variable containing a |
| // pointer to the exception object THROWN_PTR_P and a type CATCH_TYPE to |
| // compare against, return whether or not there is a match and if so, |
| // update *THROWN_PTR_P. |
| |
| static bool |
| get_adjusted_ptr (const std::type_info *catch_type, |
| const std::type_info *throw_type, |
| void **thrown_ptr_p) |
| { |
| void *thrown_ptr = *thrown_ptr_p; |
| |
| // Pointer types need to adjust the actual pointer, not |
| // the pointer to pointer that is the exception object. |
| // This also has the effect of passing pointer types |
| // "by value" through the __cxa_begin_catch return value. |
| if (throw_type->__is_pointer_p ()) |
| thrown_ptr = *(void **) thrown_ptr; |
| |
| if (catch_type->__do_catch (throw_type, &thrown_ptr, 1)) |
| { |
| *thrown_ptr_p = thrown_ptr; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| // Return true if THROW_TYPE matches one if the filter types. |
| |
| static bool |
| check_exception_spec(lsda_header_info* info, _throw_typet* throw_type, |
| void* thrown_ptr, _sleb128_t filter_value) |
| { |
| const unsigned char *e = info->TType - filter_value - 1; |
| |
| while (1) |
| { |
| const std::type_info *catch_type; |
| _uleb128_t tmp; |
| |
| e = read_uleb128 (e, &tmp); |
| |
| // Zero signals the end of the list. If we've not found |
| // a match by now, then we've failed the specification. |
| if (tmp == 0) |
| return false; |
| |
| // Match a ttype entry. |
| catch_type = get_ttype_entry (info, tmp); |
| |
| // ??? There is currently no way to ask the RTTI code about the |
| // relationship between two types without reference to a specific |
| // object. There should be; then we wouldn't need to mess with |
| // thrown_ptr here. |
| if (get_adjusted_ptr (catch_type, throw_type, &thrown_ptr)) |
| return true; |
| } |
| } |
| |
| |
| // Save stage1 handler information in the exception object |
| |
| static inline void |
| save_caught_exception(struct _Unwind_Exception* ue_header, |
| struct _Unwind_Context* context |
| __attribute__((__unused__)), |
| void* thrown_ptr, |
| int handler_switch_value, |
| const unsigned char* language_specific_data, |
| _Unwind_Ptr landing_pad __attribute__((__unused__)), |
| const unsigned char* action_record) |
| { |
| __cxa_exception* xh = __get_exception_header_from_ue(ue_header); |
| |
| xh->handlerSwitchValue = handler_switch_value; |
| xh->actionRecord = action_record; |
| xh->languageSpecificData = language_specific_data; |
| xh->adjustedPtr = thrown_ptr; |
| |
| // ??? Completely unknown what this field is supposed to be for. |
| // ??? Need to cache TType encoding base for call_unexpected. |
| xh->catchTemp = landing_pad; |
| } |
| |
| |
| // Restore the catch handler information saved during phase1. |
| |
| static inline void |
| restore_caught_exception(struct _Unwind_Exception* ue_header, |
| int& handler_switch_value, |
| const unsigned char*& language_specific_data, |
| _Unwind_Ptr& landing_pad) |
| { |
| __cxa_exception* xh = __get_exception_header_from_ue(ue_header); |
| handler_switch_value = xh->handlerSwitchValue; |
| language_specific_data = xh->languageSpecificData; |
| landing_pad = (_Unwind_Ptr) xh->catchTemp; |
| } |
| |
| #define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND |
| |
| // Return true if the filter spec is empty, ie throw(). |
| |
| static bool |
| empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value) |
| { |
| const unsigned char *e = info->TType - filter_value - 1; |
| _uleb128_t tmp; |
| |
| e = read_uleb128 (e, &tmp); |
| return tmp == 0; |
| } |
| |
| #endif // !__ARM_EABI_UNWINDER__ |
| |
| namespace __cxxabiv1 |
| { |
| |
| // Using a different personality function name causes link failures |
| // when trying to mix code using different exception handling models. |
| #ifdef __USING_SJLJ_EXCEPTIONS__ |
| #define PERSONALITY_FUNCTION __gxx_personality_sj0 |
| #define __builtin_eh_return_data_regno(x) x |
| #elif defined(__SEH__) |
| #define PERSONALITY_FUNCTION __gxx_personality_imp |
| #else |
| #define PERSONALITY_FUNCTION __gxx_personality_v0 |
| #endif |
| |
| #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__) |
| static |
| #else |
| extern "C" |
| #endif |
| _Unwind_Reason_Code |
| #ifdef __ARM_EABI_UNWINDER__ |
| __attribute__((target ("general-regs-only"))) |
| PERSONALITY_FUNCTION (_Unwind_State state, |
| struct _Unwind_Exception* ue_header, |
| struct _Unwind_Context* context) |
| #else |
| PERSONALITY_FUNCTION (int version, |
| _Unwind_Action actions, |
| _Unwind_Exception_Class exception_class, |
| struct _Unwind_Exception *ue_header, |
| struct _Unwind_Context *context) |
| #endif |
| { |
| enum found_handler_type |
| { |
| found_nothing, |
| found_terminate, |
| found_cleanup, |
| found_handler |
| } found_type; |
| |
| lsda_header_info info; |
| const unsigned char *language_specific_data; |
| const unsigned char *action_record; |
| const unsigned char *p; |
| _Unwind_Ptr landing_pad, ip; |
| int handler_switch_value; |
| void* thrown_ptr = 0; |
| bool foreign_exception; |
| int ip_before_insn = 0; |
| |
| #ifdef __ARM_EABI_UNWINDER__ |
| _Unwind_Action actions; |
| |
| switch (state & _US_ACTION_MASK) |
| { |
| case _US_VIRTUAL_UNWIND_FRAME: |
| // If the unwind state pattern is |
| // _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND |
| // then we don't need to search for any handler as it is not a real |
| // exception. Just unwind the stack. |
| if (state & _US_FORCE_UNWIND) |
| CONTINUE_UNWINDING; |
| actions = _UA_SEARCH_PHASE; |
| break; |
| |
| case _US_UNWIND_FRAME_STARTING: |
| actions = _UA_CLEANUP_PHASE; |
| if (!(state & _US_FORCE_UNWIND) |
| && ue_header->barrier_cache.sp == _Unwind_GetGR(context, |
| UNWIND_STACK_REG)) |
| actions |= _UA_HANDLER_FRAME; |
| break; |
| |
| case _US_UNWIND_FRAME_RESUME: |
| CONTINUE_UNWINDING; |
| break; |
| |
| default: |
| std::abort(); |
| } |
| actions |= state & _US_FORCE_UNWIND; |
| |
| // We don't know which runtime we're working with, so can't check this. |
| // However the ABI routines hide this from us, and we don't actually need |
| // to know. |
| foreign_exception = false; |
| |
| // The dwarf unwinder assumes the context structure holds things like the |
| // function and LSDA pointers. The ARM implementation caches these in |
| // the exception header (UCB). To avoid rewriting everything we make a |
| // virtual scratch register point at the UCB. |
| ip = (_Unwind_Ptr) ue_header; |
| _Unwind_SetGR(context, UNWIND_POINTER_REG, ip); |
| #else |
| __cxa_exception* xh = __get_exception_header_from_ue(ue_header); |
| |
| // Interface version check. |
| if (version != 1) |
| return _URC_FATAL_PHASE1_ERROR; |
| foreign_exception = !__is_gxx_exception_class(exception_class); |
| #endif |
| |
| // Shortcut for phase 2 found handler for domestic exception. |
| if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME) |
| && !foreign_exception) |
| { |
| restore_caught_exception(ue_header, handler_switch_value, |
| language_specific_data, landing_pad); |
| found_type = (landing_pad == 0 ? found_terminate : found_handler); |
| goto install_context; |
| } |
| |
| language_specific_data = (const unsigned char *) |
| _Unwind_GetLanguageSpecificData (context); |
| |
| // If no LSDA, then there are no handlers or cleanups. |
| if (! language_specific_data) |
| CONTINUE_UNWINDING; |
| |
| // Parse the LSDA header. |
| p = parse_lsda_header (context, language_specific_data, &info); |
| info.ttype_base = base_of_encoded_value (info.ttype_encoding, context); |
| #ifdef _GLIBCXX_HAVE_GETIPINFO |
| ip = _Unwind_GetIPInfo (context, &ip_before_insn); |
| #else |
| ip = _Unwind_GetIP (context); |
| #endif |
| if (! ip_before_insn) |
| --ip; |
| landing_pad = 0; |
| action_record = 0; |
| handler_switch_value = 0; |
| |
| #ifdef __USING_SJLJ_EXCEPTIONS__ |
| // The given "IP" is an index into the call-site table, with two |
| // exceptions -- -1 means no-action, and 0 means terminate. But |
| // since we're using uleb128 values, we've not got random access |
| // to the array. |
| if ((int) ip < 0) |
| return _URC_CONTINUE_UNWIND; |
| else if (ip == 0) |
| { |
| // Fall through to set found_terminate. |
| } |
| else |
| { |
| _uleb128_t cs_lp, cs_action; |
| do |
| { |
| p = read_uleb128 (p, &cs_lp); |
| p = read_uleb128 (p, &cs_action); |
| } |
| while (--ip); |
| |
| // Can never have null landing pad for sjlj -- that would have |
| // been indicated by a -1 call site index. |
| landing_pad = cs_lp + 1; |
| if (cs_action) |
| action_record = info.action_table + cs_action - 1; |
| goto found_something; |
| } |
| #else |
| // Search the call-site table for the action associated with this IP. |
| while (p < info.action_table) |
| { |
| _Unwind_Ptr cs_start, cs_len, cs_lp; |
| _uleb128_t cs_action; |
| |
| // Note that all call-site encodings are "absolute" displacements. |
| p = read_encoded_value (0, info.call_site_encoding, p, &cs_start); |
| p = read_encoded_value (0, info.call_site_encoding, p, &cs_len); |
| p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp); |
| p = read_uleb128 (p, &cs_action); |
| |
| // The table is sorted, so if we've passed the ip, stop. |
| if (ip < info.Start + cs_start) |
| p = info.action_table; |
| else if (ip < info.Start + cs_start + cs_len) |
| { |
| if (cs_lp) |
| landing_pad = info.LPStart + cs_lp; |
| if (cs_action) |
| action_record = info.action_table + cs_action - 1; |
| goto found_something; |
| } |
| } |
| #endif // __USING_SJLJ_EXCEPTIONS__ |
| |
| // If ip is not present in the table, call terminate. This is for |
| // a destructor inside a cleanup, or a library routine the compiler |
| // was not expecting to throw. |
| found_type = found_terminate; |
| goto do_something; |
| |
| found_something: |
| if (landing_pad == 0) |
| { |
| // If ip is present, and has a null landing pad, there are |
| // no cleanups or handlers to be run. |
| found_type = found_nothing; |
| } |
| else if (action_record == 0) |
| { |
| // If ip is present, has a non-null landing pad, and a null |
| // action table offset, then there are only cleanups present. |
| // Cleanups use a zero switch value, as set above. |
| found_type = found_cleanup; |
| } |
| else |
| { |
| // Otherwise we have a catch handler or exception specification. |
| |
| _sleb128_t ar_filter, ar_disp; |
| const std::type_info* catch_type; |
| _throw_typet* throw_type; |
| bool saw_cleanup = false; |
| bool saw_handler = false; |
| |
| #ifdef __ARM_EABI_UNWINDER__ |
| // ??? How does this work - more importantly, how does it interact with |
| // dependent exceptions? |
| throw_type = ue_header; |
| if (actions & _UA_FORCE_UNWIND) |
| { |
| __GXX_INIT_FORCED_UNWIND_CLASS(ue_header->exception_class); |
| } |
| else if (!foreign_exception) |
| thrown_ptr = __get_object_from_ue (ue_header); |
| #else |
| #if __cpp_rtti |
| // During forced unwinding, match a magic exception type. |
| if (actions & _UA_FORCE_UNWIND) |
| { |
| throw_type = &typeid(abi::__forced_unwind); |
| } |
| // With a foreign exception class, there's no exception type. |
| // ??? What to do about GNU Java and GNU Ada exceptions? |
| else if (foreign_exception) |
| { |
| throw_type = &typeid(abi::__foreign_exception); |
| } |
| else |
| #endif |
| { |
| thrown_ptr = __get_object_from_ue (ue_header); |
| throw_type = __get_exception_header_from_obj |
| (thrown_ptr)->exceptionType; |
| } |
| #endif |
| |
| while (1) |
| { |
| p = action_record; |
| p = read_sleb128 (p, &ar_filter); |
| read_sleb128 (p, &ar_disp); |
| |
| if (ar_filter == 0) |
| { |
| // Zero filter values are cleanups. |
| saw_cleanup = true; |
| } |
| else if (ar_filter > 0) |
| { |
| // Positive filter values are handlers. |
| catch_type = get_ttype_entry (&info, ar_filter); |
| |
| // Null catch type is a catch-all handler; we can catch foreign |
| // exceptions with this. Otherwise we must match types. |
| if (! catch_type |
| || (throw_type |
| && get_adjusted_ptr (catch_type, throw_type, |
| &thrown_ptr))) |
| { |
| saw_handler = true; |
| break; |
| } |
| } |
| else |
| { |
| // Negative filter values are exception specifications. |
| // ??? How do foreign exceptions fit in? As far as I can |
| // see we can't match because there's no __cxa_exception |
| // object to stuff bits in for __cxa_call_unexpected to use. |
| // Allow them iff the exception spec is non-empty. I.e. |
| // a throw() specification results in __unexpected. |
| if ((throw_type |
| && !(actions & _UA_FORCE_UNWIND) |
| && !foreign_exception) |
| ? ! check_exception_spec (&info, throw_type, thrown_ptr, |
| ar_filter) |
| : empty_exception_spec (&info, ar_filter)) |
| { |
| saw_handler = true; |
| break; |
| } |
| } |
| |
| if (ar_disp == 0) |
| break; |
| action_record = p + ar_disp; |
| } |
| |
| if (saw_handler) |
| { |
| handler_switch_value = ar_filter; |
| found_type = found_handler; |
| } |
| else |
| found_type = (saw_cleanup ? found_cleanup : found_nothing); |
| } |
| |
| do_something: |
| if (found_type == found_nothing) |
| CONTINUE_UNWINDING; |
| |
| if (actions & _UA_SEARCH_PHASE) |
| { |
| if (found_type == found_cleanup) |
| CONTINUE_UNWINDING; |
| |
| // For domestic exceptions, we cache data from phase 1 for phase 2. |
| if (!foreign_exception) |
| { |
| save_caught_exception(ue_header, context, thrown_ptr, |
| handler_switch_value, language_specific_data, |
| landing_pad, action_record); |
| } |
| return _URC_HANDLER_FOUND; |
| } |
| |
| install_context: |
| |
| // We can't use any of the cxa routines with foreign exceptions, |
| // because they all expect ue_header to be a struct __cxa_exception. |
| // So in that case, call terminate or unexpected directly. |
| if ((actions & _UA_FORCE_UNWIND) |
| || foreign_exception) |
| { |
| if (found_type == found_terminate) |
| std::terminate (); |
| else if (handler_switch_value < 0) |
| { |
| __try |
| { std::unexpected (); } |
| __catch(...) |
| { std::terminate (); } |
| } |
| } |
| else |
| { |
| if (found_type == found_terminate) |
| __cxa_call_terminate(ue_header); |
| |
| // Cache the TType base value for __cxa_call_unexpected, as we won't |
| // have an _Unwind_Context then. |
| if (handler_switch_value < 0) |
| { |
| parse_lsda_header (context, language_specific_data, &info); |
| info.ttype_base = base_of_encoded_value (info.ttype_encoding, |
| context); |
| |
| #ifdef __ARM_EABI_UNWINDER__ |
| const _Unwind_Word* e; |
| _Unwind_Word n; |
| |
| e = ((const _Unwind_Word*) info.TType) - handler_switch_value - 1; |
| // Count the number of rtti objects. |
| n = 0; |
| while (e[n] != 0) |
| n++; |
| |
| // Count. |
| ue_header->barrier_cache.bitpattern[1] = n; |
| // Base |
| ue_header->barrier_cache.bitpattern[2] = info.ttype_base; |
| // Stride. |
| ue_header->barrier_cache.bitpattern[3] = 4; |
| // List head. |
| ue_header->barrier_cache.bitpattern[4] = (_Unwind_Word) e; |
| #else |
| xh->catchTemp = base_of_encoded_value (info.ttype_encoding, context); |
| #endif |
| } |
| } |
| |
| /* For targets with pointers smaller than the word size, we must extend the |
| pointer, and this extension is target dependent. */ |
| _Unwind_SetGR (context, __builtin_eh_return_data_regno (0), |
| __builtin_extend_pointer (ue_header)); |
| _Unwind_SetGR (context, __builtin_eh_return_data_regno (1), |
| handler_switch_value); |
| _Unwind_SetIP (context, landing_pad); |
| #ifdef __ARM_EABI_UNWINDER__ |
| if (found_type == found_cleanup) |
| __cxa_begin_cleanup(ue_header); |
| #endif |
| return _URC_INSTALL_CONTEXT; |
| } |
| |
| /* The ARM EABI implementation of __cxa_call_unexpected is in a |
| different file so that the personality routine (PR) can be used |
| standalone. The generic routine shared datastructures with the PR |
| so it is most convenient to implement it here. */ |
| #ifndef __ARM_EABI_UNWINDER__ |
| extern "C" void |
| __cxa_call_unexpected (void *exc_obj_in) |
| { |
| _Unwind_Exception *exc_obj |
| = reinterpret_cast <_Unwind_Exception *>(exc_obj_in); |
| |
| __cxa_begin_catch (exc_obj); |
| |
| // This function is a handler for our exception argument. If we exit |
| // by throwing a different exception, we'll need the original cleaned up. |
| struct end_catch_protect |
| { |
| end_catch_protect() { } |
| ~end_catch_protect() { __cxa_end_catch(); } |
| } end_catch_protect_obj; |
| |
| lsda_header_info info; |
| __cxa_exception *xh = __get_exception_header_from_ue (exc_obj); |
| const unsigned char *xh_lsda; |
| _Unwind_Sword xh_switch_value; |
| std::terminate_handler xh_terminate_handler; |
| |
| // If the unexpectedHandler rethrows the exception (e.g. to categorize it), |
| // it will clobber data about the current handler. So copy the data out now. |
| xh_lsda = xh->languageSpecificData; |
| xh_switch_value = xh->handlerSwitchValue; |
| xh_terminate_handler = xh->terminateHandler; |
| info.ttype_base = (_Unwind_Ptr) xh->catchTemp; |
| |
| __try |
| { __unexpected (xh->unexpectedHandler); } |
| __catch(...) |
| { |
| // Get the exception thrown from unexpected. |
| |
| __cxa_eh_globals *globals = __cxa_get_globals_fast (); |
| __cxa_exception *new_xh = globals->caughtExceptions; |
| void *new_ptr = __get_object_from_ambiguous_exception (new_xh); |
| |
| // We don't quite have enough stuff cached; re-parse the LSDA. |
| parse_lsda_header (0, xh_lsda, &info); |
| |
| // If this new exception meets the exception spec, allow it. |
| if (check_exception_spec (&info, __get_exception_header_from_obj |
| (new_ptr)->exceptionType, |
| new_ptr, xh_switch_value)) |
| { __throw_exception_again; } |
| |
| // If the exception spec allows std::bad_exception, throw that. |
| // We don't have a thrown object to compare against, but since |
| // bad_exception doesn't have virtual bases, that's OK; just pass 0. |
| #if __cpp_exceptions && __cpp_rtti |
| const std::type_info &bad_exc = typeid (std::bad_exception); |
| if (check_exception_spec (&info, &bad_exc, 0, xh_switch_value)) |
| throw std::bad_exception(); |
| #endif |
| |
| // Otherwise, die. |
| __terminate (xh_terminate_handler); |
| } |
| } |
| #endif |
| |
| #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__) |
| extern "C" |
| EXCEPTION_DISPOSITION |
| __gxx_personality_seh0 (PEXCEPTION_RECORD ms_exc, void *this_frame, |
| PCONTEXT ms_orig_context, PDISPATCHER_CONTEXT ms_disp) |
| { |
| return _GCC_specific_handler (ms_exc, this_frame, ms_orig_context, |
| ms_disp, __gxx_personality_imp); |
| } |
| #endif /* SEH */ |
| |
| } // namespace __cxxabiv1 |