171 lines
5.4 KiB
C++
171 lines
5.4 KiB
C++
// -*- 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
|