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wine/dlls/kernel32/except.c

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/*
* Win32 exception functions
*
* Copyright (c) 1996 Onno Hovers, (onno@stack.urc.tue.nl)
* Copyright (c) 1999 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Notes:
* What really happens behind the scenes of those new
* __try{...}__except(..){....} and
* __try{...}__finally{...}
* statements is simply not documented by Microsoft. There could be different
* reasons for this:
* One reason could be that they try to hide the fact that exception
* handling in Win32 looks almost the same as in OS/2 2.x.
* Another reason could be that Microsoft does not want others to write
* binary compatible implementations of the Win32 API (like us).
*
* Whatever the reason, THIS SUCKS!! Ensuring portability or future
* compatibility may be valid reasons to keep some things undocumented.
* But exception handling is so basic to Win32 that it should be
* documented!
*
*/
#include "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include <stdio.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#include "wingdi.h"
#include "winuser.h"
#include "wine/exception.h"
#include "wine/library.h"
#include "excpt.h"
#include "wine/unicode.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
static PTOP_LEVEL_EXCEPTION_FILTER top_filter;
typedef INT (WINAPI *MessageBoxA_funcptr)(HWND,LPCSTR,LPCSTR,UINT);
typedef INT (WINAPI *MessageBoxW_funcptr)(HWND,LPCWSTR,LPCWSTR,UINT);
/*******************************************************************
* RaiseException (KERNEL32.@)
*/
void WINAPI RaiseException( DWORD code, DWORD flags, DWORD nbargs, const ULONG_PTR *args )
{
EXCEPTION_RECORD record;
/* Compose an exception record */
record.ExceptionCode = code;
record.ExceptionFlags = flags & EH_NONCONTINUABLE;
record.ExceptionRecord = NULL;
record.ExceptionAddress = RaiseException;
if (nbargs && args)
{
if (nbargs > EXCEPTION_MAXIMUM_PARAMETERS) nbargs = EXCEPTION_MAXIMUM_PARAMETERS;
record.NumberParameters = nbargs;
memcpy( record.ExceptionInformation, args, nbargs * sizeof(*args) );
}
else record.NumberParameters = 0;
RtlRaiseException( &record );
}
/*******************************************************************
* format_exception_msg
*/
static int format_exception_msg( const EXCEPTION_POINTERS *ptr, char *buffer, int size )
{
const EXCEPTION_RECORD *rec = ptr->ExceptionRecord;
int len,len2;
switch(rec->ExceptionCode)
{
case EXCEPTION_INT_DIVIDE_BY_ZERO:
len = snprintf( buffer, size, "Unhandled division by zero" );
break;
case EXCEPTION_INT_OVERFLOW:
len = snprintf( buffer, size, "Unhandled overflow" );
break;
case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
len = snprintf( buffer, size, "Unhandled array bounds" );
break;
case EXCEPTION_ILLEGAL_INSTRUCTION:
len = snprintf( buffer, size, "Unhandled illegal instruction" );
break;
case EXCEPTION_STACK_OVERFLOW:
len = snprintf( buffer, size, "Unhandled stack overflow" );
break;
case EXCEPTION_PRIV_INSTRUCTION:
len = snprintf( buffer, size, "Unhandled privileged instruction" );
break;
case EXCEPTION_ACCESS_VIOLATION:
if (rec->NumberParameters == 2)
len = snprintf( buffer, size, "Unhandled page fault on %s access to 0x%08lx",
rec->ExceptionInformation[0] == EXCEPTION_WRITE_FAULT ? "write" :
rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT ? "execute" : "read",
rec->ExceptionInformation[1]);
else
len = snprintf( buffer, size, "Unhandled page fault");
break;
case EXCEPTION_DATATYPE_MISALIGNMENT:
len = snprintf( buffer, size, "Unhandled alignment" );
break;
case CONTROL_C_EXIT:
len = snprintf( buffer, size, "Unhandled ^C");
break;
case STATUS_POSSIBLE_DEADLOCK:
len = snprintf( buffer, size, "Critical section %08lx wait failed",
rec->ExceptionInformation[0]);
break;
case EXCEPTION_WINE_STUB:
if (HIWORD(rec->ExceptionInformation[1]))
len = snprintf( buffer, size, "Unimplemented function %s.%s called",
(char *)rec->ExceptionInformation[0], (char *)rec->ExceptionInformation[1] );
else
len = snprintf( buffer, size, "Unimplemented function %s.%ld called",
(char *)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
break;
case EXCEPTION_WINE_ASSERTION:
len = snprintf( buffer, size, "Assertion failed" );
break;
case EXCEPTION_VM86_INTx:
len = snprintf( buffer, size, "Unhandled interrupt %02lx in vm86 mode",
rec->ExceptionInformation[0]);
break;
case EXCEPTION_VM86_STI:
len = snprintf( buffer, size, "Unhandled sti in vm86 mode");
break;
case EXCEPTION_VM86_PICRETURN:
len = snprintf( buffer, size, "Unhandled PIC return in vm86 mode");
break;
default:
len = snprintf( buffer, size, "Unhandled exception 0x%08x", rec->ExceptionCode);
break;
}
if ((len<0) || (len>=size))
return -1;
#ifdef __i386__
if (ptr->ContextRecord->SegCs != wine_get_cs())
len2 = snprintf(buffer+len, size-len, " at address 0x%04x:0x%08x",
ptr->ContextRecord->SegCs,
(DWORD)ptr->ExceptionRecord->ExceptionAddress);
else
#endif
len2 = snprintf(buffer+len, size-len, " at address %p",
ptr->ExceptionRecord->ExceptionAddress);
if ((len2<0) || (len>=size-len))
return -1;
return len+len2;
}
/******************************************************************
* start_debugger
*
* Does the effective debugger startup according to 'format'
*/
static BOOL start_debugger(PEXCEPTION_POINTERS epointers, HANDLE hEvent)
{
OBJECT_ATTRIBUTES attr;
UNICODE_STRING nameW;
char *cmdline, *env, *p;
HANDLE hDbgConf;
DWORD bAuto = TRUE;
PROCESS_INFORMATION info;
STARTUPINFOA startup;
char* format = NULL;
BOOL ret = FALSE;
char buffer[256];
static const WCHAR AeDebugW[] = {'M','a','c','h','i','n','e','\\',
'S','o','f','t','w','a','r','e','\\',
'M','i','c','r','o','s','o','f','t','\\',
'W','i','n','d','o','w','s',' ','N','T','\\',
'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
'A','e','D','e','b','u','g',0};
static const WCHAR DebuggerW[] = {'D','e','b','u','g','g','e','r',0};
static const WCHAR AutoW[] = {'A','u','t','o',0};
format_exception_msg( epointers, buffer, sizeof(buffer) );
MESSAGE("wine: %s (thread %04x), starting debugger...\n", buffer, GetCurrentThreadId());
attr.Length = sizeof(attr);
attr.RootDirectory = 0;
attr.ObjectName = &nameW;
attr.Attributes = 0;
attr.SecurityDescriptor = NULL;
attr.SecurityQualityOfService = NULL;
RtlInitUnicodeString( &nameW, AeDebugW );
if (!NtOpenKey( &hDbgConf, KEY_ALL_ACCESS, &attr ))
{
char buffer[64];
KEY_VALUE_PARTIAL_INFORMATION *info;
DWORD format_size = 0;
RtlInitUnicodeString( &nameW, DebuggerW );
if (NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
NULL, 0, &format_size ) == STATUS_BUFFER_OVERFLOW)
{
char *data = HeapAlloc(GetProcessHeap(), 0, format_size);
NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
data, format_size, &format_size );
info = (KEY_VALUE_PARTIAL_INFORMATION *)data;
RtlUnicodeToMultiByteSize( &format_size, (WCHAR *)info->Data, info->DataLength );
format = HeapAlloc( GetProcessHeap(), 0, format_size+1 );
RtlUnicodeToMultiByteN( format, format_size, NULL,
(WCHAR *)info->Data, info->DataLength );
format[format_size] = 0;
if (info->Type == REG_EXPAND_SZ)
{
char* tmp;
/* Expand environment variable references */
format_size=ExpandEnvironmentStringsA(format,NULL,0);
tmp=HeapAlloc(GetProcessHeap(), 0, format_size);
ExpandEnvironmentStringsA(format,tmp,format_size);
HeapFree(GetProcessHeap(), 0, format);
format=tmp;
}
HeapFree( GetProcessHeap(), 0, data );
}
RtlInitUnicodeString( &nameW, AutoW );
if (!NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
buffer, sizeof(buffer)-sizeof(WCHAR), &format_size ))
{
info = (KEY_VALUE_PARTIAL_INFORMATION *)buffer;
if (info->Type == REG_DWORD) memcpy( &bAuto, info->Data, sizeof(DWORD) );
else if (info->Type == REG_SZ)
{
WCHAR *str = (WCHAR *)info->Data;
str[info->DataLength/sizeof(WCHAR)] = 0;
bAuto = atoiW( str );
}
}
NtClose(hDbgConf);
}
if (format)
{
cmdline = HeapAlloc(GetProcessHeap(), 0, strlen(format) + 2*20);
sprintf(cmdline, format, GetCurrentProcessId(), hEvent);
HeapFree(GetProcessHeap(), 0, format);
}
else
{
cmdline = HeapAlloc(GetProcessHeap(), 0, 80);
sprintf(cmdline, "winedbg --auto %d %ld",
GetCurrentProcessId(), (ULONG_PTR)hEvent);
}
if (!bAuto)
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
MessageBoxA_funcptr pMessageBoxA = NULL;
if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
if (pMessageBoxA)
{
static const char msg[] = ".\nDo you wish to debug it?";
char buffer[256];
format_exception_msg( epointers, buffer, sizeof(buffer)-sizeof(msg) );
strcat( buffer, msg );
if (pMessageBoxA( 0, buffer, "Exception raised", MB_YESNO | MB_ICONHAND ) == IDNO)
{
TRACE("Killing process\n");
goto EXIT;
}
}
}
/* make WINEDEBUG empty in the environment */
env = GetEnvironmentStringsA();
for (p = env; *p; p += strlen(p) + 1)
{
if (!memcmp( p, "WINEDEBUG=", sizeof("WINEDEBUG=")-1 ))
{
char *next = p + strlen(p);
char *end = next + 1;
while (*end) end += strlen(end) + 1;
memmove( p + sizeof("WINEDEBUG=") - 1, next, end + 1 - next );
break;
}
}
TRACE("Starting debugger %s\n", debugstr_a(cmdline));
memset(&startup, 0, sizeof(startup));
startup.cb = sizeof(startup);
startup.dwFlags = STARTF_USESHOWWINDOW;
startup.wShowWindow = SW_SHOWNORMAL;
ret = CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, 0, env, NULL, &startup, &info);
FreeEnvironmentStringsA( env );
if (ret)
{
/* wait for debugger to come up... */
HANDLE handles[2];
CloseHandle(info.hThread);
handles[0]=hEvent;
handles[1]=info.hProcess;
WaitForMultipleObjects(2, handles, FALSE, INFINITE);
CloseHandle(info.hProcess);
}
else ERR("Couldn't start debugger (%s) (%d)\n"
"Read the Wine Developers Guide on how to set up winedbg or another debugger\n",
debugstr_a(cmdline), GetLastError());
EXIT:
HeapFree(GetProcessHeap(), 0, cmdline);
return ret;
}
/******************************************************************
* start_debugger_atomic
*
* starts the debugger in an atomic way:
* - either the debugger is not started and it is started
* - or the debugger has already been started by another thread
* - or the debugger couldn't be started
*
* returns TRUE for the two first conditions, FALSE for the last
*/
static int start_debugger_atomic(PEXCEPTION_POINTERS epointers)
{
static HANDLE hRunOnce /* = 0 */;
if (hRunOnce == 0)
{
OBJECT_ATTRIBUTES attr;
HANDLE hEvent;
attr.Length = sizeof(attr);
attr.RootDirectory = 0;
attr.Attributes = OBJ_INHERIT;
attr.ObjectName = NULL;
attr.SecurityDescriptor = NULL;
attr.SecurityQualityOfService = NULL;
/* ask for manual reset, so that once the debugger is started,
* every thread will know it */
NtCreateEvent( &hEvent, EVENT_ALL_ACCESS, &attr, TRUE, FALSE );
if (InterlockedCompareExchangePointer( (PVOID)&hRunOnce, hEvent, 0 ) == 0)
{
/* ok, our event has been set... we're the winning thread */
BOOL ret = start_debugger( epointers, hRunOnce );
DWORD tmp;
if (!ret)
{
/* so that the other threads won't be stuck */
NtSetEvent( hRunOnce, &tmp );
}
return ret;
}
/* someone beat us here... */
CloseHandle( hEvent );
}
/* and wait for the winner to have actually created the debugger */
WaitForSingleObject( hRunOnce, INFINITE );
/* in fact, here, we only know that someone has tried to start the debugger,
* we'll know by reposting the exception if it has actually attached
* to the current process */
return TRUE;
}
/*******************************************************************
* check_resource_write
*
* Check if the exception is a write attempt to the resource data.
* If yes, we unprotect the resources to let broken apps continue
* (Windows does this too).
*/
static inline BOOL check_resource_write( void *addr )
{
void *rsrc;
DWORD size;
MEMORY_BASIC_INFORMATION info;
if (!VirtualQuery( addr, &info, sizeof(info) )) return FALSE;
if (info.State == MEM_FREE || !(info.Type & MEM_IMAGE)) return FALSE;
if (!(rsrc = RtlImageDirectoryEntryToData( (HMODULE)info.AllocationBase, TRUE,
IMAGE_DIRECTORY_ENTRY_RESOURCE, &size )))
return FALSE;
if (addr < rsrc || (char *)addr >= (char *)rsrc + size) return FALSE;
TRACE( "Broken app is writing to the resource data, enabling work-around\n" );
VirtualProtect( rsrc, size, PAGE_WRITECOPY, NULL );
return TRUE;
}
/*******************************************************************
* check_no_exec
*
* Check for executing a protected area.
*/
static inline BOOL check_no_exec( void *addr )
{
MEMORY_BASIC_INFORMATION info;
if (!VirtualQuery( addr, &info, sizeof(info) )) return FALSE;
if (info.State == MEM_FREE) return FALSE;
/* prot |= PAGE_EXECUTE would be a lot easier, but MS developers
* apparently don't grasp the notion of protection bits */
switch(info.Protect)
{
case PAGE_READONLY: info.Protect = PAGE_EXECUTE_READ; break;
case PAGE_READWRITE: info.Protect = PAGE_EXECUTE_READWRITE; break;
case PAGE_WRITECOPY: info.Protect = PAGE_EXECUTE_WRITECOPY; break;
default: return FALSE;
}
/* FIXME: we should probably have a per-app option, and maybe a message box */
FIXME( "No-exec fault triggered at %p, enabling work-around\n", addr );
return VirtualProtect( addr, 1, info.Protect, NULL );
}
/*******************************************************************
* UnhandledExceptionFilter (KERNEL32.@)
*/
LONG WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
{
const EXCEPTION_RECORD *rec = epointers->ExceptionRecord;
if (rec->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && rec->NumberParameters >= 2)
{
switch(rec->ExceptionInformation[0])
{
case EXCEPTION_WRITE_FAULT:
if (check_resource_write( (void *)rec->ExceptionInformation[1] ))
return EXCEPTION_CONTINUE_EXECUTION;
break;
case EXCEPTION_EXECUTE_FAULT:
if (check_no_exec( (void *)rec->ExceptionInformation[1] ))
return EXCEPTION_CONTINUE_EXECUTION;
break;
}
}
if (!NtCurrentTeb()->Peb->BeingDebugged)
{
if (rec->ExceptionCode == CONTROL_C_EXIT)
{
/* do not launch the debugger on ^C, simply terminate the process */
TerminateProcess( GetCurrentProcess(), 1 );
}
if (top_filter)
{
LONG ret = top_filter( epointers );
if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
}
/* FIXME: Should check the current error mode */
if (!start_debugger_atomic( epointers ) || !NtCurrentTeb()->Peb->BeingDebugged)
return EXCEPTION_EXECUTE_HANDLER;
}
return EXCEPTION_CONTINUE_SEARCH;
}
/***********************************************************************
* SetUnhandledExceptionFilter (KERNEL32.@)
*/
LPTOP_LEVEL_EXCEPTION_FILTER WINAPI SetUnhandledExceptionFilter(
LPTOP_LEVEL_EXCEPTION_FILTER filter )
{
LPTOP_LEVEL_EXCEPTION_FILTER old = top_filter;
top_filter = filter;
return old;
}
/**************************************************************************
* 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 )
{
static const WCHAR User32DllW[] = {'u','s','e','r','3','2','.','d','l','l',0};
HMODULE mod = GetModuleHandleW( User32DllW );
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);
}
/**************************************************************************
* FatalExit (KERNEL32.@)
*/
void WINAPI FatalExit(int ExitCode)
{
WARN("FatalExit\n");
ExitProcess(ExitCode);
}
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