551 lines
18 KiB
C
551 lines
18 KiB
C
/*
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* NT exception handling routines
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*
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* Copyright 1999 Turchanov Sergey
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* Copyright 1999 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <signal.h>
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#include <stdarg.h>
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#include "ntstatus.h"
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#include "windef.h"
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#include "winbase.h"
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#include "thread.h"
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#include "winternl.h"
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#include "wine/exception.h"
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#include "wine/server.h"
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#include "wine/list.h"
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#include "wine/debug.h"
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#include "excpt.h"
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#include "ntdll_misc.h"
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WINE_DEFAULT_DEBUG_CHANNEL(seh);
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/* Exception record for handling exceptions happening inside exception handlers */
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typedef struct
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{
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EXCEPTION_REGISTRATION_RECORD frame;
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EXCEPTION_REGISTRATION_RECORD *prevFrame;
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} EXC_NESTED_FRAME;
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typedef struct
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{
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struct list entry;
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PVECTORED_EXCEPTION_HANDLER func;
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} VECTORED_HANDLER;
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static struct list vectored_handlers = LIST_INIT(vectored_handlers);
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static CRITICAL_SECTION vectored_handlers_section;
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static CRITICAL_SECTION_DEBUG critsect_debug =
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{
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0, 0, &vectored_handlers_section,
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{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
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0, 0, { 0, (DWORD)(__FILE__ ": vectored_handlers_section") }
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};
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static CRITICAL_SECTION vectored_handlers_section = { &critsect_debug, -1, 0, 0, 0, 0 };
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#ifdef __i386__
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# define GET_IP(context) ((LPVOID)(context)->Eip)
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#elif defined(__sparc__)
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# define GET_IP(context) ((LPVOID)(context)->pc)
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#elif defined(__powerpc__)
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# define GET_IP(context) ((LPVOID)(context)->Iar)
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#elif defined(__ALPHA__)
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# define GET_IP(context) ((LPVOID)(context)->Fir)
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#else
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# error You must define GET_IP for this CPU
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#endif
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/*******************************************************************
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* EXC_RaiseHandler
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*
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* Handler for exceptions happening inside a handler.
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*/
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static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
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CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
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{
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if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
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return ExceptionContinueSearch;
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/* We shouldn't get here so we store faulty frame in dispatcher */
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*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
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return ExceptionNestedException;
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}
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/*******************************************************************
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* EXC_UnwindHandler
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*
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* Handler for exceptions happening inside an unwind handler.
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*/
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static DWORD EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
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CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
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{
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if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
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return ExceptionContinueSearch;
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/* We shouldn't get here so we store faulty frame in dispatcher */
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*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
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return ExceptionCollidedUnwind;
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}
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/*******************************************************************
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* EXC_CallHandler
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*
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* Call an exception handler, setting up an exception frame to catch exceptions
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* happening during the handler execution.
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* Please do not change the first 4 parameters order in any way - some exceptions handlers
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* rely on Base Pointer (EBP) to have a fixed position related to the exception frame
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*/
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static DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
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CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
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PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler)
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{
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EXC_NESTED_FRAME newframe;
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DWORD ret;
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newframe.frame.Handler = nested_handler;
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newframe.prevFrame = frame;
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__wine_push_frame( &newframe.frame );
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TRACE( "calling handler at %p code=%lx flags=%lx\n",
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handler, record->ExceptionCode, record->ExceptionFlags );
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ret = handler( record, frame, context, dispatcher );
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TRACE( "handler returned %lx\n", ret );
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__wine_pop_frame( &newframe.frame );
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return ret;
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}
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/**********************************************************************
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* send_debug_event
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*
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* Send an EXCEPTION_DEBUG_EVENT event to the debugger.
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*/
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static int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
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{
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int ret;
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HANDLE handle = 0;
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if (!NtCurrentTeb()->Peb->BeingDebugged) return 0; /* no debugger present */
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SERVER_START_REQ( queue_exception_event )
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{
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req->first = first_chance;
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wine_server_add_data( req, context, sizeof(*context) );
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wine_server_add_data( req, rec, sizeof(*rec) );
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if (!wine_server_call( req )) handle = reply->handle;
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}
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SERVER_END_REQ;
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if (!handle) return 0;
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/* No need to wait on the handle since the process gets suspended
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* once the event is passed to the debugger, so when we get back
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* here the event has been continued already.
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*/
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SERVER_START_REQ( get_exception_status )
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{
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req->handle = handle;
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wine_server_set_reply( req, context, sizeof(*context) );
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wine_server_call( req );
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ret = reply->status;
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}
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SERVER_END_REQ;
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NtClose( handle );
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return ret;
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}
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/**********************************************************************
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* call_vectored_handlers
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*
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* Call the vectored handlers chain.
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*/
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static LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
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{
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struct list *ptr;
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LONG ret = EXCEPTION_CONTINUE_SEARCH;
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EXCEPTION_POINTERS except_ptrs;
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except_ptrs.ExceptionRecord = rec;
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except_ptrs.ContextRecord = context;
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RtlEnterCriticalSection( &vectored_handlers_section );
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LIST_FOR_EACH( ptr, &vectored_handlers )
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{
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VECTORED_HANDLER *handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
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ret = handler->func( &except_ptrs );
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if (ret == EXCEPTION_CONTINUE_EXECUTION) break;
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}
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RtlLeaveCriticalSection( &vectored_handlers_section );
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return ret;
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}
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/*******************************************************************
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* EXC_DefaultHandling
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*
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* Default handling for exceptions. Called when we didn't find a suitable handler.
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*/
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static void EXC_DefaultHandling( EXCEPTION_RECORD *rec, CONTEXT *context )
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{
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if (send_debug_event( rec, FALSE, context ) == DBG_CONTINUE) return; /* continue execution */
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if (rec->ExceptionFlags & EH_STACK_INVALID)
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ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
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else if (rec->ExceptionCode == EXCEPTION_NONCONTINUABLE_EXCEPTION)
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ERR("Process attempted to continue execution after noncontinuable exception.\n");
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else
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ERR("Unhandled exception code %lx flags %lx addr %p\n",
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rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
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NtTerminateProcess( NtCurrentProcess(), 1 );
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}
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/***********************************************************************
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* RtlRaiseException (NTDLL.@)
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*/
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void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
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{
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EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
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EXCEPTION_RECORD newrec;
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DWORD res, c;
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TRACE( "code=%lx flags=%lx addr=%p\n", rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
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for (c=0; c<rec->NumberParameters; c++) TRACE(" info[%ld]=%08lx\n", c, rec->ExceptionInformation[c]);
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if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
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{
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if (HIWORD(rec->ExceptionInformation[1]))
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FIXME( "call (from %p) to unimplemented function %s.%s\n",
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rec->ExceptionAddress,
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(char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
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else
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FIXME( "call (from %p) to unimplemented function %s.%ld\n",
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rec->ExceptionAddress,
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(char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
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}
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#ifdef __i386__
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else
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{
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TRACE(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
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context->Eax, context->Ebx, context->Ecx,
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context->Edx, context->Esi, context->Edi );
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TRACE(" ebp=%08lx esp=%08lx cs=%04lx ds=%04lx es=%04lx fs=%04lx gs=%04lx flags=%08lx\n",
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context->Ebp, context->Esp, context->SegCs, context->SegDs,
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context->SegEs, context->SegFs, context->SegGs, context->EFlags );
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}
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#endif
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if (send_debug_event( rec, TRUE, context ) == DBG_CONTINUE) return; /* continue execution */
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if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION) return;
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frame = NtCurrentTeb()->Tib.ExceptionList;
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nested_frame = NULL;
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while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
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{
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/* Check frame address */
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if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
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((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
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(ULONG_PTR)frame & 3)
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{
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rec->ExceptionFlags |= EH_STACK_INVALID;
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break;
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}
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/* Call handler */
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res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, EXC_RaiseHandler );
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if (frame == nested_frame)
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{
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/* no longer nested */
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nested_frame = NULL;
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rec->ExceptionFlags &= ~EH_NESTED_CALL;
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}
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switch(res)
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{
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case ExceptionContinueExecution:
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if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return;
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newrec.ExceptionCode = STATUS_NONCONTINUABLE_EXCEPTION;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = rec;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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break;
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case ExceptionContinueSearch:
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break;
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case ExceptionNestedException:
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if (nested_frame < dispatch) nested_frame = dispatch;
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rec->ExceptionFlags |= EH_NESTED_CALL;
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break;
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default:
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newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = rec;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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break;
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}
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frame = frame->Prev;
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}
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EXC_DefaultHandling( rec, context );
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}
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/**********************************************************************/
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#ifdef DEFINE_REGS_ENTRYPOINT
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DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 4, 4 );
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#else
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void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
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{
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CONTEXT context;
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memset( &context, 0, sizeof(context) );
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__regs_RtlRaiseException( rec, &context );
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}
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#endif
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/*******************************************************************
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* RtlUnwind (NTDLL.@)
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*/
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void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID unusedEip,
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PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context )
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{
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EXCEPTION_RECORD record, newrec;
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EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
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#ifdef __i386__
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context->Eax = (DWORD)returnEax;
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#endif
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/* build an exception record, if we do not have one */
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if (!pRecord)
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{
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record.ExceptionCode = STATUS_UNWIND;
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record.ExceptionFlags = 0;
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record.ExceptionRecord = NULL;
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record.ExceptionAddress = GET_IP(context);
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record.NumberParameters = 0;
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pRecord = &record;
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}
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pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
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TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
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/* get chain of exception frames */
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frame = NtCurrentTeb()->Tib.ExceptionList;
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while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
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{
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/* Check frame address */
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if (pEndFrame && (frame > pEndFrame))
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{
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newrec.ExceptionCode = STATUS_INVALID_UNWIND_TARGET;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = pRecord;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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}
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if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
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((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
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(int)frame & 3)
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{
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newrec.ExceptionCode = STATUS_BAD_STACK;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = pRecord;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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}
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/* Call handler */
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switch(EXC_CallHandler( pRecord, frame, context, &dispatch,
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frame->Handler, EXC_UnwindHandler ))
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{
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case ExceptionContinueSearch:
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break;
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case ExceptionCollidedUnwind:
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frame = dispatch;
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break;
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default:
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newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = pRecord;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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break;
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}
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frame = __wine_pop_frame( frame );
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}
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}
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/**********************************************************************/
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#ifdef DEFINE_REGS_ENTRYPOINT
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DEFINE_REGS_ENTRYPOINT( RtlUnwind, 16, 16 );
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#else
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void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip,
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PEXCEPTION_RECORD pRecord, PVOID returnEax )
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{
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CONTEXT context;
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memset( &context, 0, sizeof(context) );
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__regs_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context );
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}
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#endif
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/*******************************************************************
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* NtRaiseException (NTDLL.@)
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*/
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void WINAPI __regs_NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx,
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BOOL first, CONTEXT *context )
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{
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__regs_RtlRaiseException( rec, ctx );
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*context = *ctx;
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}
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#ifdef DEFINE_REGS_ENTRYPOINT
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DEFINE_REGS_ENTRYPOINT( NtRaiseException, 12, 12 );
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#else
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void WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first )
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{
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CONTEXT context;
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memset( &context, 0, sizeof(context) );
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__regs_NtRaiseException( rec, ctx, first, &context );
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}
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#endif
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/***********************************************************************
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* RtlRaiseStatus (NTDLL.@)
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*
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* Raise an exception with ExceptionCode = status
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*/
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void WINAPI RtlRaiseStatus( NTSTATUS status )
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{
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EXCEPTION_RECORD ExceptionRec;
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ExceptionRec.ExceptionCode = status;
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ExceptionRec.ExceptionFlags = EH_NONCONTINUABLE;
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ExceptionRec.ExceptionRecord = NULL;
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ExceptionRec.NumberParameters = 0;
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RtlRaiseException( &ExceptionRec );
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}
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/*******************************************************************
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* RtlAddVectoredExceptionHandler (NTDLL.@)
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*/
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PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
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{
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VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
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if (handler)
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{
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handler->func = func;
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RtlEnterCriticalSection( &vectored_handlers_section );
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if (first) list_add_head( &vectored_handlers, &handler->entry );
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else list_add_tail( &vectored_handlers, &handler->entry );
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RtlLeaveCriticalSection( &vectored_handlers_section );
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}
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return handler;
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}
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/*******************************************************************
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* RtlRemoveVectoredExceptionHandler (NTDLL.@)
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*/
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ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
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{
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struct list *ptr;
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ULONG ret = FALSE;
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RtlEnterCriticalSection( &vectored_handlers_section );
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LIST_FOR_EACH( ptr, &vectored_handlers )
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{
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if (ptr == &((VECTORED_HANDLER *)handler)->entry)
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{
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list_remove( ptr );
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ret = TRUE;
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break;
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}
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}
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RtlLeaveCriticalSection( &vectored_handlers_section );
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if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
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return ret;
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}
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/*************************************************************
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* __wine_exception_handler (NTDLL.@)
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*
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* Exception handler for exception blocks declared in Wine code.
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*/
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DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
|
|
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
|
|
{
|
|
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
|
|
|
|
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
|
|
return ExceptionContinueSearch;
|
|
if (wine_frame->u.filter)
|
|
{
|
|
EXCEPTION_POINTERS ptrs;
|
|
ptrs.ExceptionRecord = record;
|
|
ptrs.ContextRecord = context;
|
|
switch(wine_frame->u.filter( &ptrs ))
|
|
{
|
|
case EXCEPTION_CONTINUE_SEARCH:
|
|
return ExceptionContinueSearch;
|
|
case EXCEPTION_CONTINUE_EXECUTION:
|
|
return ExceptionContinueExecution;
|
|
case EXCEPTION_EXECUTE_HANDLER:
|
|
break;
|
|
default:
|
|
MESSAGE( "Invalid return value from exception filter\n" );
|
|
assert( FALSE );
|
|
}
|
|
}
|
|
/* hack to make GetExceptionCode() work in handler */
|
|
wine_frame->ExceptionCode = record->ExceptionCode;
|
|
wine_frame->ExceptionRecord = wine_frame;
|
|
|
|
RtlUnwind( frame, 0, record, 0 );
|
|
__wine_pop_frame( frame );
|
|
siglongjmp( wine_frame->jmp, 1 );
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* __wine_finally_handler (NTDLL.@)
|
|
*
|
|
* Exception handler for try/finally blocks declared in Wine code.
|
|
*/
|
|
DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
|
|
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
|
|
{
|
|
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
|
|
{
|
|
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
|
|
wine_frame->u.finally_func( FALSE );
|
|
}
|
|
return ExceptionContinueSearch;
|
|
}
|