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/*
* Win32 debugger functions
*
* 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
*/
#include <stdio.h>
#include <string.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/server.h"
#include "wine/asm.h"
#include "kernelbase.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
WINE_DECLARE_DEBUG_CHANNEL(winedbg);
typedef INT (WINAPI *MessageBoxA_funcptr)(HWND,LPCSTR,LPCSTR,UINT);
typedef INT (WINAPI *MessageBoxW_funcptr)(HWND,LPCWSTR,LPCWSTR,UINT);
static PTOP_LEVEL_EXCEPTION_FILTER top_filter;
void *dummy = RtlUnwind; /* force importing RtlUnwind from ntdll */
/***********************************************************************
* CheckRemoteDebuggerPresent (kernelbase.@)
*/
BOOL WINAPI DECLSPEC_HOTPATCH CheckRemoteDebuggerPresent( HANDLE process, BOOL *present )
{
DWORD_PTR port;
if (!process || !present)
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
if (!set_ntstatus( NtQueryInformationProcess( process, ProcessDebugPort, &port, sizeof(port), NULL )))
return FALSE;
*present = !!port;
return TRUE;
}
/**********************************************************************
* ContinueDebugEvent (kernelbase.@)
*/
BOOL WINAPI DECLSPEC_HOTPATCH ContinueDebugEvent( DWORD pid, DWORD tid, DWORD status )
{
BOOL ret;
SERVER_START_REQ( continue_debug_event )
{
req->pid = pid;
req->tid = tid;
req->status = status;
ret = !wine_server_call_err( req );
}
SERVER_END_REQ;
return ret;
}
/**********************************************************************
* DebugActiveProcess (kernelbase.@)
*/
BOOL WINAPI DECLSPEC_HOTPATCH DebugActiveProcess( DWORD pid )
{
HANDLE process;
BOOL ret;
SERVER_START_REQ( debug_process )
{
req->pid = pid;
req->attach = 1;
ret = !wine_server_call_err( req );
}
SERVER_END_REQ;
if (!ret) return FALSE;
if (!(process = OpenProcess( PROCESS_CREATE_THREAD, FALSE, pid ))) return FALSE;
ret = set_ntstatus( DbgUiIssueRemoteBreakin( process ));
NtClose( process );
if (!ret) DebugActiveProcessStop( pid );
return ret;
}
/**********************************************************************
* DebugActiveProcessStop (kernelbase.@)
*/
BOOL WINAPI DECLSPEC_HOTPATCH DebugActiveProcessStop( DWORD pid )
{
BOOL ret;
SERVER_START_REQ( debug_process )
{
req->pid = pid;
req->attach = 0;
ret = !wine_server_call_err( req );
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* DebugBreak (kernelbase.@)
*/
#if defined(__i386__) || defined(__x86_64__)
__ASM_STDCALL_FUNC( DebugBreak, 0, "jmp " __ASM_STDCALL("DbgBreakPoint", 0) )
#else
void WINAPI DebugBreak(void)
{
DbgBreakPoint();
}
#endif
/**************************************************************************
* FatalAppExitA (kernelbase.@)
*/
void WINAPI DECLSPEC_HOTPATCH FatalAppExitA( UINT action, LPCSTR str )
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
MessageBoxA_funcptr pMessageBoxA = NULL;
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) );
RtlExitUserProcess( 1 );
}
/**************************************************************************
* FatalAppExitW (kernelbase.@)
*/
void WINAPI DECLSPEC_HOTPATCH FatalAppExitW( UINT action, LPCWSTR str )
{
HMODULE mod = GetModuleHandleW( L"user32.dll" );
MessageBoxW_funcptr pMessageBoxW = NULL;
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) );
RtlExitUserProcess( 1 );
}
/***********************************************************************
* IsDebuggerPresent (kernelbase.@)
*/
BOOL WINAPI IsDebuggerPresent(void)
{
return NtCurrentTeb()->Peb->BeingDebugged;
}
static LONG WINAPI debug_exception_handler( EXCEPTION_POINTERS *eptr )
{
EXCEPTION_RECORD *rec = eptr->ExceptionRecord;
return (rec->ExceptionCode == DBG_PRINTEXCEPTION_C) ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
}
/***********************************************************************
* OutputDebugStringA (kernelbase.@)
*/
void WINAPI DECLSPEC_HOTPATCH OutputDebugStringA( LPCSTR str )
{
static HANDLE DBWinMutex = NULL;
static BOOL mutex_inited = FALSE;
BOOL caught_by_dbg = TRUE;
if (!str) str = "";
WARN( "%s\n", debugstr_a(str) );
/* raise exception, WaitForDebugEvent() will generate a corresponding debug event */
__TRY
{
ULONG_PTR args[2];
args[0] = strlen(str) + 1;
args[1] = (ULONG_PTR)str;
RaiseException( DBG_PRINTEXCEPTION_C, 0, 2, args );
}
__EXCEPT(debug_exception_handler)
{
caught_by_dbg = FALSE;
}
__ENDTRY
if (caught_by_dbg) return;
/* send string to a system-wide monitor */
if (!mutex_inited)
{
/* first call to OutputDebugString, initialize mutex handle */
HANDLE mutex = CreateMutexExW( NULL, L"DBWinMutex", 0, SYNCHRONIZE );
if (mutex)
{
if (InterlockedCompareExchangePointer( &DBWinMutex, mutex, 0 ) != 0)
/* someone beat us here... */
CloseHandle( mutex );
}
mutex_inited = TRUE;
}
if (DBWinMutex)
{
HANDLE mapping;
mapping = OpenFileMappingW( FILE_MAP_WRITE, FALSE, L"DBWIN_BUFFER" );
if (mapping)
{
LPVOID buffer;
HANDLE eventbuffer, eventdata;
buffer = MapViewOfFile( mapping, FILE_MAP_WRITE, 0, 0, 0 );
eventbuffer = OpenEventW( SYNCHRONIZE, FALSE, L"DBWIN_BUFFER_READY" );
eventdata = OpenEventW( EVENT_MODIFY_STATE, FALSE, L"DBWIN_DATA_READY" );
if (buffer && eventbuffer && eventdata)
{
/* monitor is present, synchronize with other OutputDebugString invocations */
WaitForSingleObject( DBWinMutex, INFINITE );
/* acquire control over the buffer */
if (WaitForSingleObject( eventbuffer, 10000 ) == WAIT_OBJECT_0)
{
int str_len = strlen( str );
struct _mon_buffer_t
{
DWORD pid;
char buffer[1];
} *mon_buffer = (struct _mon_buffer_t*) buffer;
if (str_len > (4096 - sizeof(DWORD) - 1)) str_len = 4096 - sizeof(DWORD) - 1;
mon_buffer->pid = GetCurrentProcessId();
memcpy( mon_buffer->buffer, str, str_len );
mon_buffer->buffer[str_len] = 0;
/* signal data ready */
SetEvent( eventdata );
}
ReleaseMutex( DBWinMutex );
}
if (buffer) UnmapViewOfFile( buffer );
if (eventbuffer) CloseHandle( eventbuffer );
if (eventdata) CloseHandle( eventdata );
CloseHandle( mapping );
}
}
}
/***********************************************************************
* OutputDebugStringW (kernelbase.@)
*/
void WINAPI DECLSPEC_HOTPATCH OutputDebugStringW( LPCWSTR str )
{
UNICODE_STRING strW;
STRING strA;
RtlInitUnicodeString( &strW, str );
if (!RtlUnicodeStringToAnsiString( &strA, &strW, TRUE ))
{
OutputDebugStringA( strA.Buffer );
RtlFreeAnsiString( &strA );
}
}
/*******************************************************************
* RaiseException (kernelbase.@)
*/
void WINAPI DECLSPEC_HOTPATCH RaiseException( DWORD code, DWORD flags, DWORD count, const ULONG_PTR *args )
{
EXCEPTION_RECORD record;
record.ExceptionCode = code;
record.ExceptionFlags = flags & EH_NONCONTINUABLE;
record.ExceptionRecord = NULL;
record.ExceptionAddress = RaiseException;
if (count && args)
{
if (count > EXCEPTION_MAXIMUM_PARAMETERS) count = EXCEPTION_MAXIMUM_PARAMETERS;
record.NumberParameters = count;
memcpy( record.ExceptionInformation, args, count * sizeof(*args) );
}
else record.NumberParameters = 0;
RtlRaiseException( &record );
}
/***********************************************************************
* SetUnhandledExceptionFilter (kernelbase.@)
*/
LPTOP_LEVEL_EXCEPTION_FILTER WINAPI DECLSPEC_HOTPATCH SetUnhandledExceptionFilter(
LPTOP_LEVEL_EXCEPTION_FILTER filter )
{
return InterlockedExchangePointer( (void **)&top_filter, filter );
}
/******************************************************************************
* WaitForDebugEvent (kernelbase.@)
*/
BOOL WINAPI DECLSPEC_HOTPATCH WaitForDebugEvent( DEBUG_EVENT *event, DWORD timeout )
{
BOOL ret;
DWORD res;
int i;
for (;;)
{
HANDLE wait = 0;
debug_event_t data;
SERVER_START_REQ( wait_debug_event )
{
req->get_handle = (timeout != 0);
wine_server_set_reply( req, &data, sizeof(data) );
if (!(ret = !wine_server_call_err( req ))) goto done;
if (!wine_server_reply_size( reply )) /* timeout */
{
wait = wine_server_ptr_handle( reply->wait );
ret = FALSE;
goto done;
}
event->dwDebugEventCode = data.code;
event->dwProcessId = (DWORD)reply->pid;
event->dwThreadId = (DWORD)reply->tid;
switch (data.code)
{
case EXCEPTION_DEBUG_EVENT:
if (data.exception.exc_code == DBG_PRINTEXCEPTION_C && data.exception.nb_params >= 2)
{
event->dwDebugEventCode = OUTPUT_DEBUG_STRING_EVENT;
event->u.DebugString.lpDebugStringData = wine_server_get_ptr( data.exception.params[1] );
event->u.DebugString.fUnicode = FALSE;
event->u.DebugString.nDebugStringLength = data.exception.params[0];
break;
}
else if (data.exception.exc_code == DBG_RIPEXCEPTION && data.exception.nb_params >= 2)
{
event->dwDebugEventCode = RIP_EVENT;
event->u.RipInfo.dwError = data.exception.params[0];
event->u.RipInfo.dwType = data.exception.params[1];
break;
}
event->u.Exception.dwFirstChance = data.exception.first;
event->u.Exception.ExceptionRecord.ExceptionCode = data.exception.exc_code;
event->u.Exception.ExceptionRecord.ExceptionFlags = data.exception.flags;
event->u.Exception.ExceptionRecord.ExceptionRecord = wine_server_get_ptr( data.exception.record );
event->u.Exception.ExceptionRecord.ExceptionAddress = wine_server_get_ptr( data.exception.address );
event->u.Exception.ExceptionRecord.NumberParameters = data.exception.nb_params;
for (i = 0; i < data.exception.nb_params; i++)
event->u.Exception.ExceptionRecord.ExceptionInformation[i] = data.exception.params[i];
break;
case CREATE_THREAD_DEBUG_EVENT:
event->u.CreateThread.hThread = wine_server_ptr_handle( data.create_thread.handle );
event->u.CreateThread.lpThreadLocalBase = wine_server_get_ptr( data.create_thread.teb );
event->u.CreateThread.lpStartAddress = wine_server_get_ptr( data.create_thread.start );
break;
case CREATE_PROCESS_DEBUG_EVENT:
event->u.CreateProcessInfo.hFile = wine_server_ptr_handle( data.create_process.file );
event->u.CreateProcessInfo.hProcess = wine_server_ptr_handle( data.create_process.process );
event->u.CreateProcessInfo.hThread = wine_server_ptr_handle( data.create_process.thread );
event->u.CreateProcessInfo.lpBaseOfImage = wine_server_get_ptr( data.create_process.base );
event->u.CreateProcessInfo.dwDebugInfoFileOffset = data.create_process.dbg_offset;
event->u.CreateProcessInfo.nDebugInfoSize = data.create_process.dbg_size;
event->u.CreateProcessInfo.lpThreadLocalBase = wine_server_get_ptr( data.create_process.teb );
event->u.CreateProcessInfo.lpStartAddress = wine_server_get_ptr( data.create_process.start );
event->u.CreateProcessInfo.lpImageName = wine_server_get_ptr( data.create_process.name );
event->u.CreateProcessInfo.fUnicode = data.create_process.unicode;
break;
case EXIT_THREAD_DEBUG_EVENT:
event->u.ExitThread.dwExitCode = data.exit.exit_code;
break;
case EXIT_PROCESS_DEBUG_EVENT:
event->u.ExitProcess.dwExitCode = data.exit.exit_code;
break;
case LOAD_DLL_DEBUG_EVENT:
event->u.LoadDll.hFile = wine_server_ptr_handle( data.load_dll.handle );
event->u.LoadDll.lpBaseOfDll = wine_server_get_ptr( data.load_dll.base );
event->u.LoadDll.dwDebugInfoFileOffset = data.load_dll.dbg_offset;
event->u.LoadDll.nDebugInfoSize = data.load_dll.dbg_size;
event->u.LoadDll.lpImageName = wine_server_get_ptr( data.load_dll.name );
event->u.LoadDll.fUnicode = data.load_dll.unicode;
break;
case UNLOAD_DLL_DEBUG_EVENT:
event->u.UnloadDll.lpBaseOfDll = wine_server_get_ptr( data.unload_dll.base );
break;
}
done:
/* nothing */ ;
}
SERVER_END_REQ;
if (ret) return TRUE;
if (!wait) break;
res = WaitForSingleObject( wait, timeout );
CloseHandle( wait );
if (res != STATUS_WAIT_0) break;
}
SetLastError( ERROR_SEM_TIMEOUT );
return FALSE;
}
/*******************************************************************
* format_exception_msg
*/
static void format_exception_msg( const EXCEPTION_POINTERS *ptr, char *buffer, int size )
{
const EXCEPTION_RECORD *rec = ptr->ExceptionRecord;
int len;
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 %p",
rec->ExceptionInformation[0] == EXCEPTION_WRITE_FAULT ? "write" :
rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT ? "execute" : "read",
(void *)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 %p wait failed",
(void *)rec->ExceptionInformation[0]);
break;
case EXCEPTION_WINE_STUB:
if ((ULONG_PTR)rec->ExceptionInformation[1] >> 16)
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;
default:
len = snprintf( buffer, size, "Unhandled exception 0x%08x in thread %x",
rec->ExceptionCode, GetCurrentThreadId());
break;
}
if (len < 0 || len >= size) return;
snprintf( buffer + len, size - len, " at address %p", ptr->ExceptionRecord->ExceptionAddress );
}
/******************************************************************
* start_debugger
*
* Does the effective debugger startup according to 'format'
*/
static BOOL start_debugger( EXCEPTION_POINTERS *epointers, HANDLE event )
{
OBJECT_ATTRIBUTES attr;
UNICODE_STRING nameW;
WCHAR *cmdline, *env, *p, *format = NULL;
HANDLE dbg_key;
DWORD autostart = TRUE;
PROCESS_INFORMATION info;
STARTUPINFOW startup;
BOOL ret = FALSE;
char buffer[256];
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, L"\\Registry\\Machine\\Software\\Microsoft\\Windows NT\\CurrentVersion\\AeDebug" );
if (!NtOpenKey( &dbg_key, KEY_READ, &attr ))
{
KEY_VALUE_PARTIAL_INFORMATION *info;
DWORD format_size = 0;
RtlInitUnicodeString( &nameW, L"Debugger" );
if (NtQueryValueKey( dbg_key, &nameW, KeyValuePartialInformation,
NULL, 0, &format_size ) == STATUS_BUFFER_TOO_SMALL)
{
char *data = HeapAlloc( GetProcessHeap(), 0, format_size );
NtQueryValueKey( dbg_key, &nameW, KeyValuePartialInformation,
data, format_size, &format_size );
info = (KEY_VALUE_PARTIAL_INFORMATION *)data;
format = HeapAlloc( GetProcessHeap(), 0, info->DataLength + sizeof(WCHAR) );
memcpy( format, info->Data, info->DataLength );
format[info->DataLength / sizeof(WCHAR)] = 0;
if (info->Type == REG_EXPAND_SZ)
{
WCHAR *tmp;
format_size = ExpandEnvironmentStringsW( format, NULL, 0 );
tmp = HeapAlloc( GetProcessHeap(), 0, format_size * sizeof(WCHAR));
ExpandEnvironmentStringsW( format, tmp, format_size );
HeapFree( GetProcessHeap(), 0, format );
format = tmp;
}
HeapFree( GetProcessHeap(), 0, data );
}
RtlInitUnicodeString( &nameW, L"Auto" );
if (!NtQueryValueKey( dbg_key, &nameW, KeyValuePartialInformation,
buffer, sizeof(buffer)-sizeof(WCHAR), &format_size ))
{
info = (KEY_VALUE_PARTIAL_INFORMATION *)buffer;
if (info->Type == REG_DWORD) memcpy( &autostart, info->Data, sizeof(DWORD) );
else if (info->Type == REG_SZ)
{
WCHAR *str = (WCHAR *)info->Data;
str[info->DataLength/sizeof(WCHAR)] = 0;
autostart = wcstol( str, NULL, 10 );
}
}
NtClose( dbg_key );
}
if (format)
{
size_t format_size = lstrlenW( format ) + 2*20;
cmdline = HeapAlloc( GetProcessHeap(), 0, format_size * sizeof(WCHAR) );
swprintf( cmdline, format_size, format, (long)GetCurrentProcessId(), (long)HandleToLong(event) );
HeapFree( GetProcessHeap(), 0, format );
}
else
{
cmdline = HeapAlloc( GetProcessHeap(), 0, 80 * sizeof(WCHAR) );
swprintf( cmdline, 80, L"winedbg --auto %ld %ld", (long)GetCurrentProcessId(), (long)HandleToLong(event) );
}
if (!autostart)
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
MessageBoxA_funcptr pMessageBoxA = NULL;
if (mod) pMessageBoxA = (void *)GetProcAddress( mod, "MessageBoxA" );
if (pMessageBoxA)
{
static const char msg[] = ".\nDo you wish to debug it?";
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 = GetEnvironmentStringsW();
if (!TRACE_ON(winedbg))
{
for (p = env; *p; p += lstrlenW(p) + 1)
{
if (!wcsncmp( p, L"WINEDEBUG=", 10 ))
{
WCHAR *next = p + lstrlenW(p);
WCHAR *end = next + 1;
while (*end) end += lstrlenW(end) + 1;
memmove( p + 10, next, end + 1 - next );
break;
}
}
}
TRACE( "Starting debugger %s\n", debugstr_w(cmdline) );
memset( &startup, 0, sizeof(startup) );
startup.cb = sizeof(startup);
startup.dwFlags = STARTF_USESHOWWINDOW;
startup.wShowWindow = SW_SHOWNORMAL;
ret = CreateProcessW( NULL, cmdline, NULL, NULL, TRUE, 0, env, NULL, &startup, &info );
FreeEnvironmentStringsW( env );
if (ret)
{
/* wait for debugger to come up... */
HANDLE handles[2];
CloseHandle( info.hThread );
handles[0] = event;
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_w(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 BOOL start_debugger_atomic( EXCEPTION_POINTERS *epointers )
{
static HANDLE once;
if (once == 0)
{
OBJECT_ATTRIBUTES attr;
HANDLE event;
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( &event, EVENT_ALL_ACCESS, &attr, NotificationEvent, FALSE );
if (InterlockedCompareExchangePointer( &once, event, 0 ) == 0)
{
/* ok, our event has been set... we're the winning thread */
BOOL ret = start_debugger( epointers, once );
if (!ret)
{
/* so that the other threads won't be stuck */
NtSetEvent( once, NULL );
}
return ret;
}
/* someone beat us here... */
CloseHandle( event );
}
/* and wait for the winner to have actually created the debugger */
WaitForSingleObject( once, 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 BOOL check_resource_write( void *addr )
{
DWORD old_prot;
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( 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_READWRITE, &old_prot );
return TRUE;
}
/*******************************************************************
* UnhandledExceptionFilter (kernelbase.@)
*/
LONG WINAPI UnhandledExceptionFilter( EXCEPTION_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;
}
}
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;
}
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