| // -*- C++ -*- ARM specific Exception handling support routines. |
| // Copyright (C) 2004, 2005 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 2, 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. |
| // |
| // You should have received a copy of the GNU General Public License |
| // along with GCC; see the file COPYING. If not, write to |
| // the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
| // Boston, MA 02110-1301, USA. |
| |
| // As a special exception, you may use this file as part of a free software |
| // library without restriction. Specifically, if other files instantiate |
| // templates or use macros or inline functions from this file, or you compile |
| // this file and link it with other files to produce an executable, this |
| // file does not by itself cause the resulting executable to be covered by |
| // the GNU General Public License. This exception does not however |
| // invalidate any other reasons why the executable file might be covered by |
| // the GNU General Public License. |
| |
| #include <cxxabi.h> |
| #include "unwind-cxx.h" |
| |
| #ifdef __ARM_EABI_UNWINDER__ |
| |
| using namespace __cxxabiv1; |
| |
| |
| // 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. |
| |
| extern "C" __cxa_type_match_result |
| __cxa_type_match(_Unwind_Exception* ue_header, |
| const std::type_info* catch_type, |
| bool is_reference __attribute__((__unused__)), |
| void** thrown_ptr_p) |
| { |
| if (!__is_gxx_exception_class(ue_header->exception_class)) |
| return ctm_failed; |
| |
| __cxa_exception* xh = __get_exception_header_from_ue(ue_header); |
| const std::type_info* throw_type = xh->exceptionType; |
| 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; |
| |
| if (typeid(*catch_type) == typeid (typeid(void*))) |
| { |
| const __pointer_type_info *catch_pointer_type = |
| static_cast<const __pointer_type_info *> (catch_type); |
| const __pointer_type_info *throw_pointer_type = |
| static_cast<const __pointer_type_info *> (throw_type); |
| |
| if (typeid (*catch_pointer_type->__pointee) != typeid (void) |
| && (*catch_pointer_type->__pointee != |
| *throw_pointer_type->__pointee)) |
| return ctm_succeeded_with_ptr_to_base; |
| } |
| |
| return ctm_succeeded; |
| } |
| |
| return ctm_failed; |
| } |
| |
| // ABI defined routine called at the start of a cleanup handler. |
| extern "C" bool |
| __cxa_begin_cleanup(_Unwind_Exception* ue_header) |
| { |
| __cxa_eh_globals *globals = __cxa_get_globals(); |
| __cxa_exception *header = __get_exception_header_from_ue(ue_header); |
| bool native = __is_gxx_exception_class(header->unwindHeader.exception_class); |
| |
| |
| if (native) |
| { |
| header->propagationCount++; |
| // Add it to the chain if this is the first time we've seen this |
| // exception. |
| if (header->propagationCount == 1) |
| { |
| header->nextPropagatingException = globals->propagatingExceptions; |
| globals->propagatingExceptions = header; |
| } |
| } |
| else |
| { |
| // Remember the exception object, so end_cleanup can return it. |
| // These cannot be stacked, so we must abort if we already have |
| // a propagating exception. |
| if (globals->propagatingExceptions) |
| std::terminate (); |
| globals->propagatingExceptions = header; |
| } |
| |
| return true; |
| } |
| |
| // Do the work for __cxa_end_cleanup. Returns the currently propagating |
| // exception object. |
| extern "C" _Unwind_Exception * |
| __gnu_end_cleanup(void) |
| { |
| __cxa_exception *header; |
| __cxa_eh_globals *globals = __cxa_get_globals(); |
| |
| header = globals->propagatingExceptions; |
| |
| // Check something hasn't gone horribly wrong. |
| if (!header) |
| std::terminate(); |
| |
| if (__is_gxx_exception_class(header->unwindHeader.exception_class)) |
| { |
| header->propagationCount--; |
| if (header->propagationCount == 0) |
| { |
| // Remove exception from chain. |
| globals->propagatingExceptions = header->nextPropagatingException; |
| header->nextPropagatingException = NULL; |
| } |
| } |
| else |
| globals->propagatingExceptions = NULL; |
| |
| return &header->unwindHeader; |
| } |
| |
| // Assembly wrapper to call __gnu_end_cleanup without clobbering r1-r3. |
| // Also push r4 to preserve stack alignment. |
| #ifdef __thumb__ |
| asm (".global __cxa_end_cleanup\n" |
| " .type __cxa_end_cleanup, \"function\"\n" |
| " .thumb_func\n" |
| "__cxa_end_cleanup:\n" |
| " push\t{r1, r2, r3, r4}\n" |
| " bl\t__gnu_end_cleanup\n" |
| " pop\t{r1, r2, r3, r4}\n" |
| " bl\t_Unwind_Resume @ Never returns\n"); |
| #else |
| asm (".global __cxa_end_cleanup\n" |
| " .type __cxa_end_cleanup, \"function\"\n" |
| "__cxa_end_cleanup:\n" |
| " stmfd\tsp!, {r1, r2, r3, r4}\n" |
| " bl\t__gnu_end_cleanup\n" |
| " ldmfd\tsp!, {r1, r2, r3, r4}\n" |
| " bl\t_Unwind_Resume @ Never returns\n"); |
| #endif |
| |
| #endif |