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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libstdc++-v3/] [libsupc++/] [eh_arm.cc] - Rev 750
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// -*- C++ -*- ARM specific Exception handling support routines. // Copyright (C) 2004, 2005, 2008, 2009, 2010 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 <cxxabi.h> #include "unwind-cxx.h" #ifdef __ARM_EABI_UNWINDER__ using namespace __cxxabiv1; // Given the thrown type THROW_TYPE, exception object UE_HEADER and a // type CATCH_TYPE to compare against, return whether or not there is // a match and if so, update *THROWN_PTR_P to point to either the // type-matched object, or in the case of a pointer type, the object // pointed to by the pointer. 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) { bool forced_unwind = __is_gxx_forced_unwind_class(ue_header->exception_class); bool foreign_exception = !forced_unwind && !__is_gxx_exception_class(ue_header->exception_class); bool dependent_exception = __is_dependent_exception(ue_header->exception_class); __cxa_exception* xh = __get_exception_header_from_ue(ue_header); __cxa_dependent_exception *dx = __get_dependent_exception_from_ue(ue_header); const std::type_info* throw_type; void *thrown_ptr = 0; if (forced_unwind) throw_type = &typeid(abi::__forced_unwind); else if (foreign_exception) throw_type = &typeid(abi::__foreign_exception); else { if (dependent_exception) xh = __get_exception_header_from_obj (dx->primaryException); throw_type = xh->exceptionType; // We used to require the caller set the target of thrown_ptr_p, // but that's incorrect -- the EHABI makes no such requirement // -- and not all callers will set it. Fortunately callers that // do initialize will always pass us the value we calculate // here, so there's no backwards compatibility problem. thrown_ptr = __get_object_from_ue (ue_header); } __cxa_type_match_result result = ctm_succeeded; // 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; // We need to indicate the indirection to our caller. result = ctm_succeeded_with_ptr_to_base; } if (catch_type->__do_catch(throw_type, &thrown_ptr, 1)) { *thrown_ptr_p = thrown_ptr; return result; } 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; } #ifdef __TMS320C6X__ // Assembly wrapper to call __gnu_end_cleanup without clobbering // function arguments to _Unwind_Resume. asm (".global __cxa_end_cleanup\n" " .type __cxa_end_cleanup, \"function\"\n" "__cxa_end_cleanup:\n" " stw .d2t2 B9, *B15--[10]\n" " stw .d2t2 B8, *+B15[9]\n" " stw .d2t2 B7, *+B15[8]\n" " stw .d2t2 B6, *+B15[7]\n" " stw .d2t2 B5, *+B15[6]\n" " stw .d2t2 B4, *+B15[5]\n" " stw .d2t1 A9, *+B15[4]\n" " stw .d2t1 A8, *+B15[3]\n" " stw .d2t1 A7, *+B15[2]\n" " stw .d2t1 A6, *+B15[1]\n" #ifdef _TMS320C6400_PLUS " callp .s2 (__gnu_end_cleanup), B3\n" #elif defined(_TMS320C6400) " call .s2 (__gnu_end_cleanup)\n" " addkpc .s2 1f, B3, 0\n" " nop 4\n" "1:\n" #else " call .s2 (__gnu_end_cleanup)\n" " mvkl .s2 1f, B3\n" " mvkh .s2 1f, B3\n" " nop 3\n" "1:\n" #endif " ldw .d2t1 *+B15[1], A6\n" " ldw .d2t1 *+B15[2], A7\n" " ldw .d2t1 *+B15[3], A8\n" " ldw .d2t1 *+B15[4], A9\n" " ldw .d2t2 *+B15[5], B4\n" " ldw .d2t2 *+B15[6], B5\n" " ldw .d2t2 *+B15[7], B6\n" " ldw .d2t2 *+B15[8], B7\n" " ldw .d2t2 *+B15[9], B8\n" " ldw .d2t2 *++B15[10], B9\n" " b .s2 _Unwind_Resume\n" " nop 5\n"); #else // Assembly wrapper to call __gnu_end_cleanup without clobbering r1-r3. // Also push r4 to preserve stack alignment. #ifdef __thumb__ asm (" .pushsection .text.__cxa_end_cleanup\n" " .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" " .popsection\n"); #else asm (" .pushsection .text.__cxa_end_cleanup\n" " .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" " .popsection\n"); #endif #endif #endif
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