228 lines
6.9 KiB
C++
228 lines
6.9 KiB
C++
// -*- C++ -*- ARM specific Exception handling support routines.
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// Copyright (C) 2004-2017 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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//
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <cxxabi.h>
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#include "unwind-cxx.h"
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#ifdef __ARM_EABI_UNWINDER__
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using namespace __cxxabiv1;
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// Given the thrown type THROW_TYPE, exception object UE_HEADER and a
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// type CATCH_TYPE to compare against, return whether or not there is
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// a match and if so, update *THROWN_PTR_P to point to either the
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// type-matched object, or in the case of a pointer type, the object
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// pointed to by the pointer.
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extern "C" __cxa_type_match_result
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__cxa_type_match(_Unwind_Exception* ue_header,
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const std::type_info* catch_type,
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bool is_reference __attribute__((__unused__)),
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void** thrown_ptr_p)
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{
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bool forced_unwind
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= __is_gxx_forced_unwind_class(ue_header->exception_class);
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bool foreign_exception
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= !forced_unwind && !__is_gxx_exception_class(ue_header->exception_class);
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bool dependent_exception
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= __is_dependent_exception(ue_header->exception_class);
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__cxa_exception* xh = __get_exception_header_from_ue(ue_header);
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__cxa_dependent_exception *dx = __get_dependent_exception_from_ue(ue_header);
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const std::type_info* throw_type;
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void *thrown_ptr = 0;
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if (forced_unwind)
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throw_type = &typeid(abi::__forced_unwind);
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else if (foreign_exception)
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throw_type = &typeid(abi::__foreign_exception);
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else
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{
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if (dependent_exception)
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xh = __get_exception_header_from_obj (dx->primaryException);
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throw_type = xh->exceptionType;
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// We used to require the caller set the target of thrown_ptr_p,
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// but that's incorrect -- the EHABI makes no such requirement
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// -- and not all callers will set it. Fortunately callers that
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// do initialize will always pass us the value we calculate
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// here, so there's no backwards compatibility problem.
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thrown_ptr = __get_object_from_ue (ue_header);
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}
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__cxa_type_match_result result = ctm_succeeded;
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// Pointer types need to adjust the actual pointer, not
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// the pointer to pointer that is the exception object.
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// This also has the effect of passing pointer types
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// "by value" through the __cxa_begin_catch return value.
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if (throw_type->__is_pointer_p())
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{
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thrown_ptr = *(void**) thrown_ptr;
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// We need to indicate the indirection to our caller.
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result = ctm_succeeded_with_ptr_to_base;
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}
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if (catch_type->__do_catch(throw_type, &thrown_ptr, 1))
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{
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*thrown_ptr_p = thrown_ptr;
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return result;
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}
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return ctm_failed;
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}
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// ABI defined routine called at the start of a cleanup handler.
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extern "C" bool
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__cxa_begin_cleanup(_Unwind_Exception* ue_header)
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{
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__cxa_eh_globals *globals = __cxa_get_globals();
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__cxa_exception *header = __get_exception_header_from_ue(ue_header);
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bool native = __is_gxx_exception_class(header->unwindHeader.exception_class);
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if (native)
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{
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header->propagationCount++;
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// Add it to the chain if this is the first time we've seen this
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// exception.
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if (header->propagationCount == 1)
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{
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header->nextPropagatingException = globals->propagatingExceptions;
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globals->propagatingExceptions = header;
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}
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}
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else
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{
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// Remember the exception object, so end_cleanup can return it.
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// These cannot be stacked, so we must abort if we already have
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// a propagating exception.
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if (globals->propagatingExceptions)
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std::terminate ();
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globals->propagatingExceptions = header;
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}
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return true;
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}
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// Do the work for __cxa_end_cleanup. Returns the currently propagating
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// exception object.
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extern "C" _Unwind_Exception *
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__gnu_end_cleanup(void)
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{
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__cxa_exception *header;
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__cxa_eh_globals *globals = __cxa_get_globals();
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header = globals->propagatingExceptions;
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// Check something hasn't gone horribly wrong.
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if (!header)
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std::terminate();
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if (__is_gxx_exception_class(header->unwindHeader.exception_class))
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{
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header->propagationCount--;
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if (header->propagationCount == 0)
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{
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// Remove exception from chain.
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globals->propagatingExceptions = header->nextPropagatingException;
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header->nextPropagatingException = NULL;
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}
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}
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else
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globals->propagatingExceptions = NULL;
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return &header->unwindHeader;
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}
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#ifdef __TMS320C6X__
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// Assembly wrapper to call __gnu_end_cleanup without clobbering
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// function arguments to _Unwind_Resume.
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asm (".global __cxa_end_cleanup\n"
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" .type __cxa_end_cleanup, \"function\"\n"
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"__cxa_end_cleanup:\n"
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" stw .d2t2 B9, *B15--[10]\n"
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" stw .d2t2 B8, *+B15[9]\n"
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" stw .d2t2 B7, *+B15[8]\n"
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" stw .d2t2 B6, *+B15[7]\n"
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" stw .d2t2 B5, *+B15[6]\n"
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" stw .d2t2 B4, *+B15[5]\n"
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" stw .d2t1 A9, *+B15[4]\n"
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" stw .d2t1 A8, *+B15[3]\n"
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" stw .d2t1 A7, *+B15[2]\n"
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" stw .d2t1 A6, *+B15[1]\n"
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#ifdef _TMS320C6400_PLUS
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" callp .s2 (__gnu_end_cleanup), B3\n"
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#elif defined(_TMS320C6400)
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" call .s2 (__gnu_end_cleanup)\n"
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" addkpc .s2 1f, B3, 0\n"
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" nop 4\n"
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"1:\n"
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#else
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" call .s2 (__gnu_end_cleanup)\n"
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" mvkl .s2 1f, B3\n"
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" mvkh .s2 1f, B3\n"
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" nop 3\n"
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"1:\n"
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#endif
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" ldw .d2t1 *+B15[1], A6\n"
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" ldw .d2t1 *+B15[2], A7\n"
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" ldw .d2t1 *+B15[3], A8\n"
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" ldw .d2t1 *+B15[4], A9\n"
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" ldw .d2t2 *+B15[5], B4\n"
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" ldw .d2t2 *+B15[6], B5\n"
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" ldw .d2t2 *+B15[7], B6\n"
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" ldw .d2t2 *+B15[8], B7\n"
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" ldw .d2t2 *+B15[9], B8\n"
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" ldw .d2t2 *++B15[10], B9\n"
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" b .s2 _Unwind_Resume\n"
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" nop 5\n");
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#else
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// Assembly wrapper to call __gnu_end_cleanup without clobbering r1-r3.
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// Also push r4 to preserve stack alignment.
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#ifdef __thumb__
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asm (" .pushsection .text.__cxa_end_cleanup\n"
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" .global __cxa_end_cleanup\n"
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" .type __cxa_end_cleanup, \"function\"\n"
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" .thumb_func\n"
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"__cxa_end_cleanup:\n"
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" push\t{r1, r2, r3, r4}\n"
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" bl\t__gnu_end_cleanup\n"
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" pop\t{r1, r2, r3, r4}\n"
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" bl\t_Unwind_Resume @ Never returns\n"
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" .popsection\n");
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#else
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asm (" .pushsection .text.__cxa_end_cleanup\n"
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" .global __cxa_end_cleanup\n"
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" .type __cxa_end_cleanup, \"function\"\n"
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"__cxa_end_cleanup:\n"
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" stmfd\tsp!, {r1, r2, r3, r4}\n"
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" bl\t__gnu_end_cleanup\n"
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" ldmfd\tsp!, {r1, r2, r3, r4}\n"
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" bl\t_Unwind_Resume @ Never returns\n"
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" .popsection\n");
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#endif
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#endif
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#endif
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