2 * Win32 exception functions
4 * Copyright (c) 1996 Onno Hovers, (onno@stack.urc.tue.nl)
5 * Copyright (c) 1999 Alexandre Julliard
8 * What really happens behind the scenes of those new
9 * __try{...}__except(..){....} and
10 * __try{...}__finally{...}
11 * statements is simply not documented by Microsoft. There could be different
13 * One reason could be that they try to hide the fact that exception
14 * handling in Win32 looks almost the same as in OS/2 2.x.
15 * Another reason could be that Microsoft does not want others to write
16 * binary compatible implementations of the Win32 API (like us).
18 * Whatever the reason, THIS SUCKS!! Ensuring portabilty or future
19 * compatability may be valid reasons to keep some things undocumented.
20 * But exception handling is so basic to Win32 that it should be
29 #include "wine/exception.h"
30 #include "selectors.h"
34 #include "stackframe.h"
36 #include "debugtools.h"
38 DEFAULT_DEBUG_CHANNEL(seh);
41 /*******************************************************************
42 * RaiseException (KERNEL32.418)
44 void WINAPI RaiseException( DWORD code, DWORD flags, DWORD nbargs, const LPDWORD args )
46 EXCEPTION_RECORD record;
48 /* Compose an exception record */
50 record.ExceptionCode = code;
51 record.ExceptionFlags = flags & EH_NONCONTINUABLE;
52 record.ExceptionRecord = NULL;
53 record.ExceptionAddress = RaiseException;
56 if (nbargs > EXCEPTION_MAXIMUM_PARAMETERS) nbargs = EXCEPTION_MAXIMUM_PARAMETERS;
57 record.NumberParameters = nbargs;
58 memcpy( record.ExceptionInformation, args, nbargs * sizeof(*args) );
60 else record.NumberParameters = 0;
62 RtlRaiseException( &record );
66 /*******************************************************************
67 * format_exception_msg
69 static void format_exception_msg( const EXCEPTION_POINTERS *ptr, char *buffer )
71 const EXCEPTION_RECORD *rec = ptr->ExceptionRecord;
73 switch(rec->ExceptionCode)
75 case EXCEPTION_INT_DIVIDE_BY_ZERO:
76 sprintf( buffer, "Unhandled division by zero" );
78 case EXCEPTION_INT_OVERFLOW:
79 sprintf( buffer, "Unhandled overflow" );
81 case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
82 sprintf( buffer, "Unhandled array bounds" );
84 case EXCEPTION_ILLEGAL_INSTRUCTION:
85 sprintf( buffer, "Unhandled illegal instruction" );
87 case EXCEPTION_STACK_OVERFLOW:
88 sprintf( buffer, "Unhandled stack overflow" );
90 case EXCEPTION_PRIV_INSTRUCTION:
91 sprintf( buffer, "Unhandled priviledged instruction" );
93 case EXCEPTION_ACCESS_VIOLATION:
94 if (rec->NumberParameters == 2)
95 sprintf( buffer, "Unhandled page fault on %s access to 0x%08lx",
96 rec->ExceptionInformation[0] ? "write" : "read",
97 rec->ExceptionInformation[1]);
99 sprintf( buffer, "Unhandled page fault");
101 case EXCEPTION_DATATYPE_MISALIGNMENT:
102 sprintf( buffer, "Unhandled alignment" );
105 sprintf( buffer, "Unhandled ^C");
107 case EXCEPTION_CRITICAL_SECTION_WAIT:
108 sprintf( buffer, "Critical section %08lx wait failed",
109 rec->ExceptionInformation[0]);
111 case EXCEPTION_WINE_STUB:
112 sprintf( buffer, "Unimplemented function %s.%s called",
113 (char *)rec->ExceptionInformation[0], (char *)rec->ExceptionInformation[1] );
115 case EXCEPTION_VM86_INTx:
116 sprintf( buffer, "Unhandled interrupt %02lx in vm86 mode",
117 rec->ExceptionInformation[0]);
119 case EXCEPTION_VM86_STI:
120 sprintf( buffer, "Unhandled sti in vm86 mode");
122 case EXCEPTION_VM86_PICRETURN:
123 sprintf( buffer, "Unhandled PIC return in vm86 mode");
126 sprintf( buffer, "Unhandled exception 0x%08lx", rec->ExceptionCode);
130 if (ptr->ContextRecord->SegCs != __get_cs())
131 sprintf( buffer+strlen(buffer), " at address 0x%04lx:0x%08lx.\n",
132 ptr->ContextRecord->SegCs, (DWORD)ptr->ExceptionRecord->ExceptionAddress );
135 sprintf( buffer+strlen(buffer), " at address 0x%08lx.\n",
136 (DWORD)ptr->ExceptionRecord->ExceptionAddress );
137 strcat( buffer, "Do you wish to debug it ?" );
141 /*******************************************************************
142 * UnhandledExceptionFilter (KERNEL32.537)
144 DWORD WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
146 PDB* pdb = PROCESS_Current();
151 DWORD ret = EXCEPTION_EXECUTE_HANDLER;
154 /* send a last chance event to the debugger */
157 struct exception_event_request *req = server_alloc_req( sizeof(*req),
158 sizeof(EXCEPTION_RECORD)+sizeof(CONTEXT) );
159 CONTEXT *context_ptr = server_data_ptr(req);
160 EXCEPTION_RECORD *rec_ptr = (EXCEPTION_RECORD *)(context_ptr + 1);
162 *rec_ptr = *epointers->ExceptionRecord;
163 *context_ptr = *epointers->ContextRecord;
164 if (!server_call_noerr( REQ_EXCEPTION_EVENT )) *epointers->ContextRecord = *context_ptr;
165 status = req->status;
172 return EXCEPTION_CONTINUE_EXECUTION;
173 case DBG_EXCEPTION_NOT_HANDLED:
174 TerminateProcess( GetCurrentProcess(), epointers->ExceptionRecord->ExceptionCode );
175 break; /* not reached */
176 case 0: /* no debugger is present */
179 FIXME("Unsupported yet debug continue value %d (please report)\n", status);
184 DWORD ret = pdb->top_filter( epointers );
185 if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
188 /* FIXME: Should check the current error mode */
190 if (!RegOpenKeyA(HKEY_LOCAL_MACHINE,
191 "Software\\Microsoft\\Windows NT\\CurrentVersion\\AeDebug",
196 count = sizeof(format);
197 if (RegQueryValueExA(hDbgConf, "Debugger", 0, &type, format, &count))
200 count = sizeof(bAuto);
201 if (RegQueryValueExA(hDbgConf, "Auto", 0, &type, (char*)&bAuto, &count))
203 else if (type == REG_SZ)
206 count = sizeof(autostr);
207 if (!RegQueryValueExA(hDbgConf, "Auto", 0, &type, autostr, &count))
208 bAuto = atoi(autostr);
210 RegCloseKey(hDbgConf);
213 strcpy(format, "debugger/winedbg %ld %ld");
216 if (!bAuto && Callout.MessageBoxA) {
217 format_exception_msg( epointers, buffer );
218 if (Callout.MessageBoxA( 0, buffer, "Error", MB_YESNO | MB_ICONHAND ) == IDNO) {
219 TRACE("Killing process\n");
220 return EXCEPTION_EXECUTE_HANDLER;
226 PROCESS_INFORMATION info;
227 STARTUPINFOA startup;
228 OBJECT_ATTRIBUTES attr;
230 attr.Length = sizeof(attr);
231 attr.RootDirectory = 0;
232 attr.Attributes = OBJ_INHERIT;
233 attr.ObjectName = NULL;
234 attr.SecurityDescriptor = NULL;
235 attr.SecurityQualityOfService = NULL;
237 TRACE("Starting debugger (fmt=%s)\n", format);
238 NtCreateEvent( &hEvent, EVENT_ALL_ACCESS, &attr, FALSE, FALSE );
239 sprintf(buffer, format, GetCurrentProcessId(), hEvent);
240 memset(&startup, 0, sizeof(startup));
241 startup.cb = sizeof(startup);
242 startup.dwFlags = STARTF_USESHOWWINDOW;
243 startup.wShowWindow = SW_SHOWNORMAL;
244 if (CreateProcessA(NULL, buffer, NULL, NULL,
245 TRUE, 0, NULL, NULL, &startup, &info)) {
246 WaitForSingleObject(hEvent, INFINITE);
247 ret = EXCEPTION_CONTINUE_SEARCH;
249 ERR("Couldn't start debugger (%s) (%ld)\n"
250 "Read the documentation on how to set up winedbg or another debugger\n",
251 buffer, GetLastError());
255 ERR("No standard debugger defined in the registry => no debugging session\n");
262 /***********************************************************************
263 * SetUnhandledExceptionFilter (KERNEL32.516)
265 LPTOP_LEVEL_EXCEPTION_FILTER WINAPI SetUnhandledExceptionFilter(
266 LPTOP_LEVEL_EXCEPTION_FILTER filter )
268 PDB *pdb = PROCESS_Current();
269 LPTOP_LEVEL_EXCEPTION_FILTER old = pdb->top_filter;
270 pdb->top_filter = filter;
275 /**************************************************************************
276 * FatalAppExit16 (KERNEL.137)
278 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
281 FatalAppExitA( action, str );
285 /**************************************************************************
286 * FatalAppExitA (KERNEL32.108)
288 void WINAPI FatalAppExitA( UINT action, LPCSTR str )
291 if (Callout.MessageBoxA)
292 Callout.MessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
294 ERR( "%s\n", debugstr_a(str) );
299 /**************************************************************************
300 * FatalAppExitW (KERNEL32.109)
302 void WINAPI FatalAppExitW( UINT action, LPCWSTR str )
305 if (Callout.MessageBoxW)
306 Callout.MessageBoxW( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
308 ERR( "%s\n", debugstr_w(str) );