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Sweden-Number/dlls/ntdll/exception.c

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/*
* NT exception handling routines
*
* Copyright 1999 Turchanov Sergey
* Copyright 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <signal.h>
#include <stdarg.h>
#include "ntstatus.h"
#include "windef.h"
#include "winternl.h"
#include "wine/exception.h"
#include "wine/server.h"
#include "wine/list.h"
#include "wine/debug.h"
#include "excpt.h"
#include "ntdll_misc.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
/* Exception record for handling exceptions happening inside exception handlers */
typedef struct
{
EXCEPTION_REGISTRATION_RECORD frame;
EXCEPTION_REGISTRATION_RECORD *prevFrame;
} EXC_NESTED_FRAME;
typedef struct
{
struct list entry;
PVECTORED_EXCEPTION_HANDLER func;
} VECTORED_HANDLER;
static struct list vectored_handlers = LIST_INIT(vectored_handlers);
static RTL_CRITICAL_SECTION vectored_handlers_section;
static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &vectored_handlers_section,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": vectored_handlers_section") }
};
static RTL_CRITICAL_SECTION vectored_handlers_section = { &critsect_debug, -1, 0, 0, 0, 0 };
#ifdef __i386__
# define GET_IP(context) ((LPVOID)(context)->Eip)
#elif defined(__sparc__)
# define GET_IP(context) ((LPVOID)(context)->pc)
#elif defined(__powerpc__)
# define GET_IP(context) ((LPVOID)(context)->Iar)
#elif defined(__ALPHA__)
# define GET_IP(context) ((LPVOID)(context)->Fir)
#elif defined(__x86_64__)
# define GET_IP(context) ((LPVOID)(context)->Rip)
#else
# error You must define GET_IP for this CPU
#endif
/*******************************************************************
* EXC_RaiseHandler
*
* Handler for exceptions happening inside a handler.
*/
static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
return ExceptionContinueSearch;
/* We shouldn't get here so we store faulty frame in dispatcher */
*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
return ExceptionNestedException;
}
/*******************************************************************
* EXC_UnwindHandler
*
* Handler for exceptions happening inside an unwind handler.
*/
static DWORD EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
return ExceptionContinueSearch;
/* We shouldn't get here so we store faulty frame in dispatcher */
*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
return ExceptionCollidedUnwind;
}
/*******************************************************************
* EXC_CallHandler
*
* Call an exception handler, setting up an exception frame to catch exceptions
* happening during the handler execution.
* Please do not change the first 4 parameters order in any way - some exceptions handlers
* rely on Base Pointer (EBP) to have a fixed position related to the exception frame
*/
static DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler)
{
EXC_NESTED_FRAME newframe;
DWORD ret;
newframe.frame.Handler = nested_handler;
newframe.prevFrame = frame;
__wine_push_frame( &newframe.frame );
TRACE( "calling handler at %p code=%lx flags=%lx\n",
handler, record->ExceptionCode, record->ExceptionFlags );
ret = handler( record, frame, context, dispatcher );
TRACE( "handler returned %lx\n", ret );
__wine_pop_frame( &newframe.frame );
return ret;
}
/**********************************************************************
* send_debug_event
*
* Send an EXCEPTION_DEBUG_EVENT event to the debugger.
*/
static int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
{
int ret;
HANDLE handle = 0;
if (!NtCurrentTeb()->Peb->BeingDebugged) return 0; /* no debugger present */
SERVER_START_REQ( queue_exception_event )
{
req->first = first_chance;
wine_server_add_data( req, context, sizeof(*context) );
wine_server_add_data( req, rec, sizeof(*rec) );
if (!wine_server_call( req )) handle = reply->handle;
}
SERVER_END_REQ;
if (!handle) return 0;
/* No need to wait on the handle since the process gets suspended
* once the event is passed to the debugger, so when we get back
* here the event has been continued already.
*/
SERVER_START_REQ( get_exception_status )
{
req->handle = handle;
wine_server_set_reply( req, context, sizeof(*context) );
wine_server_call( req );
ret = reply->status;
}
SERVER_END_REQ;
NtClose( handle );
return ret;
}
/**********************************************************************
* call_vectored_handlers
*
* Call the vectored handlers chain.
*/
static LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
{
struct list *ptr;
LONG ret = EXCEPTION_CONTINUE_SEARCH;
EXCEPTION_POINTERS except_ptrs;
except_ptrs.ExceptionRecord = rec;
except_ptrs.ContextRecord = context;
RtlEnterCriticalSection( &vectored_handlers_section );
LIST_FOR_EACH( ptr, &vectored_handlers )
{
VECTORED_HANDLER *handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
ret = handler->func( &except_ptrs );
if (ret == EXCEPTION_CONTINUE_EXECUTION) break;
}
RtlLeaveCriticalSection( &vectored_handlers_section );
return ret;
}
/*******************************************************************
* EXC_DefaultHandling
*
* Default handling for exceptions. Called when we didn't find a suitable handler.
*/
static void EXC_DefaultHandling( EXCEPTION_RECORD *rec, CONTEXT *context )
{
if (send_debug_event( rec, FALSE, context ) == DBG_CONTINUE) return; /* continue execution */
if (rec->ExceptionFlags & EH_STACK_INVALID)
ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
ERR("Process attempted to continue execution after noncontinuable exception.\n");
else
ERR("Unhandled exception code %lx flags %lx addr %p\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
NtTerminateProcess( NtCurrentProcess(), 1 );
}
/***********************************************************************
* RtlRaiseException (NTDLL.@)
*/
void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
{
EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
EXCEPTION_RECORD newrec;
DWORD res, c;
TRACE( "code=%lx flags=%lx addr=%p\n", rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
for (c=0; c<rec->NumberParameters; c++) TRACE(" info[%ld]=%08lx\n", c, rec->ExceptionInformation[c]);
if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
{
if (HIWORD(rec->ExceptionInformation[1]))
MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
rec->ExceptionAddress,
(char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
else
MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
rec->ExceptionAddress,
(char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
}
#ifdef __i386__
else
{
TRACE(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
context->Eax, context->Ebx, context->Ecx,
context->Edx, context->Esi, context->Edi );
TRACE(" ebp=%08lx esp=%08lx cs=%04lx ds=%04lx es=%04lx fs=%04lx gs=%04lx flags=%08lx\n",
context->Ebp, context->Esp, context->SegCs, context->SegDs,
context->SegEs, context->SegFs, context->SegGs, context->EFlags );
}
#endif
if (send_debug_event( rec, TRUE, context ) == DBG_CONTINUE) return; /* continue execution */
if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION) return;
frame = NtCurrentTeb()->Tib.ExceptionList;
nested_frame = NULL;
while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
{
/* Check frame address */
if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
(ULONG_PTR)frame & 3)
{
rec->ExceptionFlags |= EH_STACK_INVALID;
break;
}
/* Call handler */
res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, EXC_RaiseHandler );
if (frame == nested_frame)
{
/* no longer nested */
nested_frame = NULL;
rec->ExceptionFlags &= ~EH_NESTED_CALL;
}
switch(res)
{
case ExceptionContinueExecution:
if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return;
newrec.ExceptionCode = STATUS_NONCONTINUABLE_EXCEPTION;
newrec.ExceptionFlags = EH_NONCONTINUABLE;
newrec.ExceptionRecord = rec;
newrec.NumberParameters = 0;
RtlRaiseException( &newrec ); /* never returns */
break;
case ExceptionContinueSearch:
break;
case ExceptionNestedException:
if (nested_frame < dispatch) nested_frame = dispatch;
rec->ExceptionFlags |= EH_NESTED_CALL;
break;
default:
newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
newrec.ExceptionFlags = EH_NONCONTINUABLE;
newrec.ExceptionRecord = rec;
newrec.NumberParameters = 0;
RtlRaiseException( &newrec ); /* never returns */
break;
}
frame = frame->Prev;
}
EXC_DefaultHandling( rec, context );
}
/**********************************************************************/
#ifdef DEFINE_REGS_ENTRYPOINT
DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 4, 4 );
#else
void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
{
CONTEXT context;
memset( &context, 0, sizeof(context) );
__regs_RtlRaiseException( rec, &context );
}
#endif
/*******************************************************************
* RtlUnwind (NTDLL.@)
*/
void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID unusedEip,
PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context )
{
EXCEPTION_RECORD record, newrec;
EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
#ifdef __i386__
context->Eax = (DWORD)returnEax;
#endif
/* build an exception record, if we do not have one */
if (!pRecord)
{
record.ExceptionCode = STATUS_UNWIND;
record.ExceptionFlags = 0;
record.ExceptionRecord = NULL;
record.ExceptionAddress = GET_IP(context);
record.NumberParameters = 0;
pRecord = &record;
}
pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
/* get chain of exception frames */
frame = NtCurrentTeb()->Tib.ExceptionList;
while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
{
/* Check frame address */
if (pEndFrame && (frame > pEndFrame))
{
newrec.ExceptionCode = STATUS_INVALID_UNWIND_TARGET;
newrec.ExceptionFlags = EH_NONCONTINUABLE;
newrec.ExceptionRecord = pRecord;
newrec.NumberParameters = 0;
RtlRaiseException( &newrec ); /* never returns */
}
if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
(UINT_PTR)frame & 3)
{
newrec.ExceptionCode = STATUS_BAD_STACK;
newrec.ExceptionFlags = EH_NONCONTINUABLE;
newrec.ExceptionRecord = pRecord;
newrec.NumberParameters = 0;
RtlRaiseException( &newrec ); /* never returns */
}
/* Call handler */
switch(EXC_CallHandler( pRecord, frame, context, &dispatch,
frame->Handler, EXC_UnwindHandler ))
{
case ExceptionContinueSearch:
break;
case ExceptionCollidedUnwind:
frame = dispatch;
break;
default:
newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
newrec.ExceptionFlags = EH_NONCONTINUABLE;
newrec.ExceptionRecord = pRecord;
newrec.NumberParameters = 0;
RtlRaiseException( &newrec ); /* never returns */
break;
}
frame = __wine_pop_frame( frame );
}
}
/**********************************************************************/
#ifdef DEFINE_REGS_ENTRYPOINT
DEFINE_REGS_ENTRYPOINT( RtlUnwind, 16, 16 );
#else
void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip,
PEXCEPTION_RECORD pRecord, PVOID returnEax )
{
CONTEXT context;
memset( &context, 0, sizeof(context) );
__regs_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context );
}
#endif
/*******************************************************************
* NtRaiseException (NTDLL.@)
*/
void WINAPI __regs_NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx,
BOOL first, CONTEXT *context )
{
__regs_RtlRaiseException( rec, ctx );
*context = *ctx;
}
#ifdef DEFINE_REGS_ENTRYPOINT
DEFINE_REGS_ENTRYPOINT( NtRaiseException, 12, 12 );
#else
void WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first )
{
CONTEXT context;
memset( &context, 0, sizeof(context) );
__regs_NtRaiseException( rec, ctx, first, &context );
}
#endif
/***********************************************************************
* RtlRaiseStatus (NTDLL.@)
*
* Raise an exception with ExceptionCode = status
*/
void WINAPI RtlRaiseStatus( NTSTATUS status )
{
EXCEPTION_RECORD ExceptionRec;
ExceptionRec.ExceptionCode = status;
ExceptionRec.ExceptionFlags = EH_NONCONTINUABLE;
ExceptionRec.ExceptionRecord = NULL;
ExceptionRec.NumberParameters = 0;
RtlRaiseException( &ExceptionRec );
}
/*******************************************************************
* RtlAddVectoredExceptionHandler (NTDLL.@)
*/
PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
{
VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
if (handler)
{
handler->func = func;
RtlEnterCriticalSection( &vectored_handlers_section );
if (first) list_add_head( &vectored_handlers, &handler->entry );
else list_add_tail( &vectored_handlers, &handler->entry );
RtlLeaveCriticalSection( &vectored_handlers_section );
}
return handler;
}
/*******************************************************************
* RtlRemoveVectoredExceptionHandler (NTDLL.@)
*/
ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
{
struct list *ptr;
ULONG ret = FALSE;
RtlEnterCriticalSection( &vectored_handlers_section );
LIST_FOR_EACH( ptr, &vectored_handlers )
{
VECTORED_HANDLER *curr_handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
if (curr_handler == handler)
{
list_remove( ptr );
ret = TRUE;
break;
}
}
RtlLeaveCriticalSection( &vectored_handlers_section );
if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
return ret;
}
/*************************************************************
* __wine_exception_handler (NTDLL.@)
*
* Exception handler for exception blocks declared in Wine code.
*/
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;
}
/*************************************************************
* __wine_spec_unimplemented_stub
*
* ntdll-specific implementation to avoid depending on kernel functions.
* Can be removed once ntdll.spec no longer contains stubs.
*/
void __wine_spec_unimplemented_stub( const char *module, const char *function )
{
EXCEPTION_RECORD record;
record.ExceptionCode = EXCEPTION_WINE_STUB;
record.ExceptionFlags = EH_NONCONTINUABLE;
record.ExceptionRecord = NULL;
record.ExceptionAddress = __wine_spec_unimplemented_stub;
record.NumberParameters = 2;
record.ExceptionInformation[0] = (ULONG_PTR)module;
record.ExceptionInformation[1] = (ULONG_PTR)function;
RtlRaiseException( &record );
}
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