Sweden-Number/dlls/ntdll/exception.c

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/*
* NT exception handling routines
*
* Copyright 1999 Turchanov Sergey
* Copyright 1999 Alexandre Julliard
*/
#include "debugtools.h"
#include "winnt.h"
#include "ntddk.h"
#include "wine/exception.h"
#include "stackframe.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 CALLBACK 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 CALLBACK 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.
*/
static DWORD EXC_CallHandler( PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler,
EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
CONTEXT *context, EXCEPTION_FRAME **dispatcher )
{
EXC_NESTED_FRAME newframe;
DWORD ret;
newframe.frame.Handler = nested_handler;
newframe.prevFrame = frame;
EXC_push_frame( &newframe.frame );
TRACE( "calling handler at %p\n", handler );
ret = handler( record, frame, context, dispatcher );
TRACE( "handler returned %lx\n", ret );
EXC_pop_frame( &newframe.frame );
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 (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 );
/* Should I add here a back trace ? */
TerminateProcess( GetCurrentProcess(), 1 );
}
/***********************************************************************
* RtlRaiseException (NTDLL.464)
*/
void WINAPI REGS_FUNC(RtlRaiseException)( EXCEPTION_RECORD *rec, CONTEXT *context )
{
PEXCEPTION_FRAME frame, dispatch, nested_frame;
EXCEPTION_RECORD newrec;
DWORD res;
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( frame->Handler, EXC_RaiseHandler, rec, frame, context, &dispatch );
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 );
}
/*******************************************************************
* RtlUnwind (KERNEL32.590) (NTDLL.518)
*/
void WINAPI REGS_FUNC(RtlUnwind)( PEXCEPTION_FRAME pEndFrame, LPVOID unusedEip,
PEXCEPTION_RECORD pRecord, DWORD returnEax,
CONTEXT *context )
{
EXCEPTION_RECORD record, newrec;
PEXCEPTION_FRAME frame, dispatch;
EAX_reg(context) = returnEax;
/* build an exception record, if we do not have one */
if (!pRecord)
{
record.ExceptionCode = STATUS_UNWIND;
record.ExceptionFlags = 0;
record.ExceptionRecord = NULL;
record.ExceptionAddress = (LPVOID)EIP_reg(context);
record.NumberParameters = 0;
pRecord = &record;
}
pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
/* 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( frame->Handler, EXC_UnwindHandler, pRecord,
frame, context, &dispatch ))
{
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;
}
NtCurrentTeb()->except = frame = frame->Prev;
}
}
/*******************************************************************
* NtRaiseException (NTDLL.175)
*
* Real prototype:
* DWORD WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first );
*/
void WINAPI REGS_FUNC(NtRaiseException)( EXCEPTION_RECORD *rec, CONTEXT *ctx,
BOOL first, CONTEXT *context )
{
REGS_FUNC(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 );
}