525 lines
18 KiB
C
525 lines
18 KiB
C
/*
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* Win32 exception functions
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*
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* Copyright (c) 1996 Onno Hovers, (onno@stack.urc.tue.nl)
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* Copyright (c) 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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* Notes:
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* What really happens behind the scenes of those new
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* __try{...}__except(..){....} and
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* __try{...}__finally{...}
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* statements is simply not documented by Microsoft. There could be different
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* reasons for this:
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* One reason could be that they try to hide the fact that exception
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* handling in Win32 looks almost the same as in OS/2 2.x.
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* Another reason could be that Microsoft does not want others to write
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* binary compatible implementations of the Win32 API (like us).
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*
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* Whatever the reason, THIS SUCKS!! Ensuring portability or future
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* compatibility may be valid reasons to keep some things undocumented.
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* But exception handling is so basic to Win32 that it should be
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* documented!
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*
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <stdio.h>
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#include "windef.h"
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#include "winerror.h"
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#include "winternl.h"
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#include "wingdi.h"
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#include "winuser.h"
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#include "wine/exception.h"
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#include "wine/library.h"
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#include "thread.h"
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#include "stackframe.h"
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#include "msvcrt/excpt.h"
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#include "wine/server.h"
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#include "wine/unicode.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(seh);
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static PTOP_LEVEL_EXCEPTION_FILTER top_filter;
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typedef INT (WINAPI *MessageBoxA_funcptr)(HWND,LPCSTR,LPCSTR,UINT);
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typedef INT (WINAPI *MessageBoxW_funcptr)(HWND,LPCWSTR,LPCWSTR,UINT);
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/*******************************************************************
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* RaiseException (KERNEL32.@)
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*/
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void WINAPI RaiseException( DWORD code, DWORD flags, DWORD nbargs, const LPDWORD args )
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{
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EXCEPTION_RECORD record;
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/* Compose an exception record */
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record.ExceptionCode = code;
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record.ExceptionFlags = flags & EH_NONCONTINUABLE;
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record.ExceptionRecord = NULL;
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record.ExceptionAddress = RaiseException;
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if (nbargs && args)
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{
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if (nbargs > EXCEPTION_MAXIMUM_PARAMETERS) nbargs = EXCEPTION_MAXIMUM_PARAMETERS;
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record.NumberParameters = nbargs;
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memcpy( record.ExceptionInformation, args, nbargs * sizeof(*args) );
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}
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else record.NumberParameters = 0;
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RtlRaiseException( &record );
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}
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/*******************************************************************
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* format_exception_msg
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*/
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static int format_exception_msg( const EXCEPTION_POINTERS *ptr, char *buffer, int size )
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{
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const EXCEPTION_RECORD *rec = ptr->ExceptionRecord;
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int len,len2;
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switch(rec->ExceptionCode)
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{
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case EXCEPTION_INT_DIVIDE_BY_ZERO:
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len = snprintf( buffer, size, "Unhandled division by zero" );
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break;
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case EXCEPTION_INT_OVERFLOW:
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len = snprintf( buffer, size, "Unhandled overflow" );
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break;
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case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
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len = snprintf( buffer, size, "Unhandled array bounds" );
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break;
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case EXCEPTION_ILLEGAL_INSTRUCTION:
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len = snprintf( buffer, size, "Unhandled illegal instruction" );
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break;
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case EXCEPTION_STACK_OVERFLOW:
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len = snprintf( buffer, size, "Unhandled stack overflow" );
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break;
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case EXCEPTION_PRIV_INSTRUCTION:
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len = snprintf( buffer, size, "Unhandled privileged instruction" );
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break;
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case EXCEPTION_ACCESS_VIOLATION:
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if (rec->NumberParameters == 2)
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len = snprintf( buffer, size, "Unhandled page fault on %s access to 0x%08lx",
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rec->ExceptionInformation[0] ? "write" : "read",
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rec->ExceptionInformation[1]);
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else
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len = snprintf( buffer, size, "Unhandled page fault");
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break;
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case EXCEPTION_DATATYPE_MISALIGNMENT:
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len = snprintf( buffer, size, "Unhandled alignment" );
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break;
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case CONTROL_C_EXIT:
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len = snprintf( buffer, size, "Unhandled ^C");
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break;
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case EXCEPTION_CRITICAL_SECTION_WAIT:
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len = snprintf( buffer, size, "Critical section %08lx wait failed",
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rec->ExceptionInformation[0]);
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break;
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case EXCEPTION_WINE_STUB:
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len = snprintf( buffer, size, "Unimplemented function %s.%s called",
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(char *)rec->ExceptionInformation[0], (char *)rec->ExceptionInformation[1] );
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break;
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case EXCEPTION_WINE_ASSERTION:
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len = snprintf( buffer, size, "Assertion failed" );
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break;
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case EXCEPTION_VM86_INTx:
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len = snprintf( buffer, size, "Unhandled interrupt %02lx in vm86 mode",
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rec->ExceptionInformation[0]);
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break;
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case EXCEPTION_VM86_STI:
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len = snprintf( buffer, size, "Unhandled sti in vm86 mode");
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break;
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case EXCEPTION_VM86_PICRETURN:
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len = snprintf( buffer, size, "Unhandled PIC return in vm86 mode");
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break;
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default:
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len = snprintf( buffer, size, "Unhandled exception 0x%08lx", rec->ExceptionCode);
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break;
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}
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if ((len<0) || (len>=size))
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return -1;
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#ifdef __i386__
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if (ptr->ContextRecord->SegCs != wine_get_cs())
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len2 = snprintf(buffer+len, size-len,
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" at address 0x%04lx:0x%08lx.\nDo you wish to debug it ?",
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ptr->ContextRecord->SegCs,
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(DWORD)ptr->ExceptionRecord->ExceptionAddress);
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else
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#endif
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len2 = snprintf(buffer+len, size-len,
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" at address 0x%08lx.\nDo you wish to debug it ?",
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(DWORD)ptr->ExceptionRecord->ExceptionAddress);
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if ((len2<0) || (len>=size-len))
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return -1;
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return len+len2;
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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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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; /* no debugger present or other error */
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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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* start_debugger
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*
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* Does the effective debugger startup according to 'format'
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*/
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static BOOL start_debugger(PEXCEPTION_POINTERS epointers, HANDLE hEvent)
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{
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OBJECT_ATTRIBUTES attr;
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UNICODE_STRING nameW;
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HKEY hDbgConf;
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DWORD bAuto = FALSE;
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PROCESS_INFORMATION info;
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STARTUPINFOA startup;
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char* cmdline;
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char* format = NULL;
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BOOL ret = FALSE;
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static const WCHAR AeDebugW[] = {'M','a','c','h','i','n','e','\\',
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'S','o','f','t','w','a','r','e','\\',
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'M','i','c','r','o','s','o','f','t','\\',
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'W','i','n','d','o','w','s',' ','N','T','\\',
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'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
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'A','e','D','e','b','u','g',0};
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static const WCHAR DebuggerW[] = {'D','e','b','u','g','g','e','r',0};
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static const WCHAR AutoW[] = {'A','u','t','o',0};
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MESSAGE("wine: Unhandled exception, starting debugger...\n");
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attr.Length = sizeof(attr);
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attr.RootDirectory = 0;
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attr.ObjectName = &nameW;
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attr.Attributes = 0;
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attr.SecurityDescriptor = NULL;
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attr.SecurityQualityOfService = NULL;
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RtlInitUnicodeString( &nameW, AeDebugW );
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if (!NtOpenKey( &hDbgConf, KEY_ALL_ACCESS, &attr ))
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{
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char buffer[64];
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KEY_VALUE_PARTIAL_INFORMATION *info;
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DWORD format_size = 0;
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RtlInitUnicodeString( &nameW, DebuggerW );
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if (NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
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NULL, 0, &format_size ) == STATUS_BUFFER_OVERFLOW)
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{
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char *data = HeapAlloc(GetProcessHeap(), 0, format_size);
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NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
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data, format_size, &format_size );
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info = (KEY_VALUE_PARTIAL_INFORMATION *)data;
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RtlUnicodeToMultiByteSize( &format_size, (WCHAR *)info->Data, info->DataLength );
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format = HeapAlloc( GetProcessHeap(), 0, format_size+1 );
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RtlUnicodeToMultiByteN( format, format_size, NULL,
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(WCHAR *)info->Data, info->DataLength );
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format[format_size] = 0;
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if (info->Type == REG_EXPAND_SZ)
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{
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char* tmp;
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/* Expand environment variable references */
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format_size=ExpandEnvironmentStringsA(format,NULL,0);
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tmp=HeapAlloc(GetProcessHeap(), 0, format_size);
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ExpandEnvironmentStringsA(format,tmp,format_size);
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HeapFree(GetProcessHeap(), 0, format);
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format=tmp;
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}
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HeapFree( GetProcessHeap(), 0, data );
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}
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RtlInitUnicodeString( &nameW, AutoW );
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if (!NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
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buffer, sizeof(buffer)-sizeof(WCHAR), &format_size ))
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{
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info = (KEY_VALUE_PARTIAL_INFORMATION *)buffer;
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if (info->Type == REG_DWORD) memcpy( &bAuto, info->Data, sizeof(DWORD) );
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else if (info->Type == REG_SZ)
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{
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WCHAR *str = (WCHAR *)info->Data;
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str[info->DataLength/sizeof(WCHAR)] = 0;
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bAuto = atoiW( str );
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}
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}
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else bAuto = TRUE;
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NtClose(hDbgConf);
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}
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if (format)
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{
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cmdline = HeapAlloc(GetProcessHeap(), 0, strlen(format) + 2*20);
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sprintf(cmdline, format, GetCurrentProcessId(), hEvent);
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HeapFree(GetProcessHeap(), 0, format);
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}
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else
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{
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cmdline = HeapAlloc(GetProcessHeap(), 0, 80);
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sprintf(cmdline, "winedbg --debugmsg -all --auto %ld %p", GetCurrentProcessId(), hEvent);
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}
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if (!bAuto)
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{
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HMODULE mod = GetModuleHandleA( "user32.dll" );
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MessageBoxA_funcptr pMessageBoxA = NULL;
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if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
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if (pMessageBoxA)
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{
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char buffer[256];
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format_exception_msg( epointers, buffer, sizeof(buffer) );
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if (pMessageBoxA( 0, buffer, "Exception raised", MB_YESNO | MB_ICONHAND ) == IDNO)
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{
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TRACE("Killing process\n");
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goto EXIT;
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}
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}
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}
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TRACE("Starting debugger %s\n", debugstr_a(cmdline));
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memset(&startup, 0, sizeof(startup));
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startup.cb = sizeof(startup);
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startup.dwFlags = STARTF_USESHOWWINDOW;
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startup.wShowWindow = SW_SHOWNORMAL;
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ret = CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, 0, NULL, NULL, &startup, &info);
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if (ret) WaitForSingleObject(hEvent, INFINITE); /* wait for debugger to come up... */
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else ERR("Couldn't start debugger (%s) (%ld)\n"
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"Read the Wine Developers Guide on how to set up winedbg or another debugger\n",
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debugstr_a(cmdline), GetLastError());
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EXIT:
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HeapFree(GetProcessHeap(), 0, cmdline);
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return ret;
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}
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/******************************************************************
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* start_debugger_atomic
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*
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* starts the debugger in an atomic way:
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* - either the debugger is not started and it is started
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* - or the debugger has already been started by another thread
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* - or the debugger couldn't be started
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*
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* returns TRUE for the two first conditions, FALSE for the last
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*/
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static int start_debugger_atomic(PEXCEPTION_POINTERS epointers)
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{
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static HANDLE hRunOnce /* = 0 */;
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if (hRunOnce == 0)
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{
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OBJECT_ATTRIBUTES attr;
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HANDLE hEvent;
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attr.Length = sizeof(attr);
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attr.RootDirectory = 0;
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attr.Attributes = OBJ_INHERIT;
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attr.ObjectName = NULL;
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attr.SecurityDescriptor = NULL;
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attr.SecurityQualityOfService = NULL;
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/* ask for manual reset, so that once the debugger is started,
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* every thread will know it */
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NtCreateEvent( &hEvent, EVENT_ALL_ACCESS, &attr, TRUE, FALSE );
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if (InterlockedCompareExchangePointer( (PVOID)&hRunOnce, hEvent, 0 ) == 0)
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{
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/* ok, our event has been set... we're the winning thread */
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BOOL ret = start_debugger( epointers, hRunOnce );
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DWORD tmp;
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if (!ret)
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{
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/* so that the other threads won't be stuck */
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NtSetEvent( hRunOnce, &tmp );
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}
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return ret;
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}
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/* someone beat us here... */
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CloseHandle( hEvent );
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}
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/* and wait for the winner to have actually created the debugger */
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WaitForSingleObject( hRunOnce, INFINITE );
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/* in fact, here, we only know that someone has tried to start the debugger,
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* we'll know by reposting the exception if it has actually attached
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* to the current process */
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return TRUE;
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}
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/*******************************************************************
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* check_resource_write
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*
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* Check if the exception is a write attempt to the resource data.
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* If yes, we unprotect the resources to let broken apps continue
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* (Windows does this too).
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*/
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inline static BOOL check_resource_write( const EXCEPTION_RECORD *rec )
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{
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void *addr, *rsrc;
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DWORD size;
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MEMORY_BASIC_INFORMATION info;
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if (rec->ExceptionCode != EXCEPTION_ACCESS_VIOLATION) return FALSE;
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if (!rec->ExceptionInformation[0]) return FALSE; /* not a write access */
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addr = (void *)rec->ExceptionInformation[1];
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if (!VirtualQuery( addr, &info, sizeof(info) )) return FALSE;
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if (!(rsrc = RtlImageDirectoryEntryToData( (HMODULE)info.AllocationBase, TRUE,
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IMAGE_DIRECTORY_ENTRY_RESOURCE, &size )))
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return FALSE;
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if (addr < rsrc || (char *)addr >= (char *)rsrc + size) return FALSE;
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FIXME( "Broken app is writing to the resource data, enabling work-around\n" );
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VirtualProtect( rsrc, size, PAGE_WRITECOPY, NULL );
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return TRUE;
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}
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/*******************************************************************
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* UnhandledExceptionFilter (KERNEL32.@)
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*/
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DWORD WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
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{
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int status;
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int loop = 0;
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if (check_resource_write( epointers->ExceptionRecord )) return EXCEPTION_CONTINUE_EXECUTION;
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for (loop = 0; loop <= 1; loop++)
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{
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/* send a last chance event to the debugger */
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status = send_debug_event( epointers->ExceptionRecord, FALSE, epointers->ContextRecord );
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switch (status)
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{
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case DBG_CONTINUE:
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return EXCEPTION_CONTINUE_EXECUTION;
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case DBG_EXCEPTION_NOT_HANDLED:
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TerminateProcess( GetCurrentProcess(), epointers->ExceptionRecord->ExceptionCode );
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break; /* not reached */
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case 0: /* no debugger is present */
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if (epointers->ExceptionRecord->ExceptionCode == CONTROL_C_EXIT)
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{
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/* do not launch the debugger on ^C, simply terminate the process */
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TerminateProcess( GetCurrentProcess(), 1 );
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}
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/* second try, the debugger isn't present... */
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if (loop == 1) return EXCEPTION_EXECUTE_HANDLER;
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break;
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default:
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FIXME("Unsupported yet debug continue value %d (please report)\n", status);
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return EXCEPTION_EXECUTE_HANDLER;
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}
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/* should only be there when loop == 0 */
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if (top_filter)
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{
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DWORD ret = top_filter( epointers );
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if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
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}
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/* FIXME: Should check the current error mode */
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if (!start_debugger_atomic( epointers ))
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return EXCEPTION_EXECUTE_HANDLER;
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/* now that we should have a debugger attached, try to resend event */
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}
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return EXCEPTION_EXECUTE_HANDLER;
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}
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/***********************************************************************
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* SetUnhandledExceptionFilter (KERNEL32.@)
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*/
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LPTOP_LEVEL_EXCEPTION_FILTER WINAPI SetUnhandledExceptionFilter(
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LPTOP_LEVEL_EXCEPTION_FILTER filter )
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{
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LPTOP_LEVEL_EXCEPTION_FILTER old = top_filter;
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top_filter = filter;
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return old;
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}
|
|
|
|
|
|
/**************************************************************************
|
|
* FatalAppExitA (KERNEL32.@)
|
|
*/
|
|
void WINAPI FatalAppExitA( UINT action, LPCSTR str )
|
|
{
|
|
HMODULE mod = GetModuleHandleA( "user32.dll" );
|
|
MessageBoxA_funcptr pMessageBoxA = NULL;
|
|
|
|
WARN("AppExit\n");
|
|
|
|
if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
|
|
if (pMessageBoxA) pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
|
|
else ERR( "%s\n", debugstr_a(str) );
|
|
ExitProcess(0);
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
* FatalAppExitW (KERNEL32.@)
|
|
*/
|
|
void WINAPI FatalAppExitW( UINT action, LPCWSTR str )
|
|
{
|
|
HMODULE mod = GetModuleHandleA( "user32.dll" );
|
|
MessageBoxW_funcptr pMessageBoxW = NULL;
|
|
|
|
WARN("AppExit\n");
|
|
|
|
if (mod) pMessageBoxW = (MessageBoxW_funcptr)GetProcAddress( mod, "MessageBoxW" );
|
|
if (pMessageBoxW) pMessageBoxW( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
|
|
else ERR( "%s\n", debugstr_w(str) );
|
|
ExitProcess(0);
|
|
}
|