123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227 |
- // -*- C++ -*- ARM specific Exception handling support routines.
- // Copyright (C) 2004-2022 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
|