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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
*/
#include <assert.h>
#include <signal.h>
#include "winnt.h"
#include "ntddk.h"
#include "global.h"
#include "wine/exception.h"
#include "stackframe.h"
#include "miscemu.h"
#include "server.h"
#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(seh);
/* Exception record for handling exceptions happening inside exception handlers */
typedef struct
{
EXCEPTION_FRAME frame;
EXCEPTION_FRAME *prevFrame;
} EXC_NESTED_FRAME;
/*******************************************************************
* EXC_RaiseHandler
*
* Handler for exceptions happening inside a handler.
*/
static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_FRAME *frame,
CONTEXT *context, EXCEPTION_FRAME **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_FRAME *frame,
CONTEXT *context, EXCEPTION_FRAME **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_FRAME *frame,
CONTEXT *context, EXCEPTION_FRAME **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 inline int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
{
int ret;
SERVER_START_REQ
{
struct exception_event_request *req = server_alloc_req( sizeof(*req),
sizeof(*rec)+sizeof(*context) );
CONTEXT *context_ptr = server_data_ptr(req);
EXCEPTION_RECORD *rec_ptr = (EXCEPTION_RECORD *)(context_ptr + 1);
req->first = first_chance;
*rec_ptr = *rec;
*context_ptr = *context;
if (!server_call_noerr( REQ_EXCEPTION_EVENT )) *context = *context_ptr;
ret = req->status;
}
SERVER_END_REQ;
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 == EXCEPTION_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 );
}
/***********************************************************************
* EXC_RtlRaiseException / RtlRaiseException (NTDLL.464)
*/
DEFINE_REGS_ENTRYPOINT_1( RtlRaiseException, EXC_RtlRaiseException, EXCEPTION_RECORD * )
void WINAPI EXC_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
{
PEXCEPTION_FRAME frame, dispatch, nested_frame;
EXCEPTION_RECORD newrec;
DWORD res;
TRACE( "code=%lx flags=%lx\n", rec->ExceptionCode, rec->ExceptionFlags );
if (send_debug_event( rec, TRUE, context ) == DBG_CONTINUE) return; /* continue execution */
frame = NtCurrentTeb()->except;
nested_frame = NULL;
while (frame != (PEXCEPTION_FRAME)0xFFFFFFFF)
{
/* Check frame address */
if (((void*)frame < NtCurrentTeb()->stack_low) ||
((void*)(frame+1) > NtCurrentTeb()->stack_top) ||
(int)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 );
}
/*******************************************************************
* EXC_RtlUnwind / RtlUnwind (KERNEL32.590) (NTDLL.518)
*/
DEFINE_REGS_ENTRYPOINT_4( RtlUnwind, EXC_RtlUnwind,
PEXCEPTION_FRAME, LPVOID, PEXCEPTION_RECORD, DWORD )
void WINAPI EXC_RtlUnwind( PEXCEPTION_FRAME pEndFrame, LPVOID unusedEip,
PEXCEPTION_RECORD pRecord, DWORD returnEax,
CONTEXT *context )
{
EXCEPTION_RECORD record, newrec;
PEXCEPTION_FRAME frame, dispatch;
#ifdef __i386__
context->Eax = 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()->except;
while ((frame != (PEXCEPTION_FRAME)0xffffffff) && (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()->stack_low) ||
((void*)(frame+1) > NtCurrentTeb()->stack_top) ||
(int)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 );
}
}
/*******************************************************************
* EXC_NtRaiseException / NtRaiseException (NTDLL.175)
*/
DEFINE_REGS_ENTRYPOINT_3( NtRaiseException, EXC_NtRaiseException,
EXCEPTION_RECORD *, CONTEXT *, BOOL )
void WINAPI EXC_NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx,
BOOL first, CONTEXT *context )
{
EXC_RtlRaiseException( rec, ctx );
*context = *ctx;
}
/***********************************************************************
* RtlRaiseStatus (NTDLL.465)
*
* 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 );
}
/*************************************************************
* __wine_exception_handler
*
* Exception handler for exception blocks declared in Wine code.
*/
DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
CONTEXT *context, LPVOID 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 );
longjmp( wine_frame->jmp, 1 );
}
/*************************************************************
* __wine_finally_handler
*
* Exception handler for try/finally blocks declared in Wine code.
*/
DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
CONTEXT *context, LPVOID pdispatcher )
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
if (!(record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
return ExceptionContinueSearch;
wine_frame->u.finally_func( FALSE );
return ExceptionContinueSearch;
}
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