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315 lines
10 KiB
C
315 lines
10 KiB
C
/*
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* NT exception handling routines
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*
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* Copyright 1999 Turchanov Sergey
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* Copyright 1999 Alexandre Julliard
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*/
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#include "debugtools.h"
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#include "winnt.h"
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#include "ntddk.h"
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#include "wine/exception.h"
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#include "stackframe.h"
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DEFAULT_DEBUG_CHANNEL(seh)
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/* Exception record for handling exceptions happening inside exception handlers */
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typedef struct
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{
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EXCEPTION_FRAME frame;
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EXCEPTION_FRAME *prevFrame;
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} EXC_NESTED_FRAME;
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/*******************************************************************
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* EXC_RaiseHandler
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*
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* Handler for exceptions happening inside a handler.
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*/
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static DWORD CALLBACK EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_FRAME *frame,
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CONTEXT *context, EXCEPTION_FRAME **dispatcher )
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{
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if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
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return ExceptionContinueSearch;
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/* We shouldn't get here so we store faulty frame in dispatcher */
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*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
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return ExceptionNestedException;
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}
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/*******************************************************************
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* EXC_UnwindHandler
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*
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* Handler for exceptions happening inside an unwind handler.
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*/
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static DWORD CALLBACK EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_FRAME *frame,
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CONTEXT *context, EXCEPTION_FRAME **dispatcher )
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{
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if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
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return ExceptionContinueSearch;
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/* We shouldn't get here so we store faulty frame in dispatcher */
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*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
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return ExceptionCollidedUnwind;
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}
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/*******************************************************************
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* EXC_CallHandler
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*
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* Call an exception handler, setting up an exception frame to catch exceptions
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* happening during the handler execution.
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*/
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static DWORD EXC_CallHandler( PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler,
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EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
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CONTEXT *context, EXCEPTION_FRAME **dispatcher )
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{
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EXC_NESTED_FRAME newframe;
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DWORD ret;
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newframe.frame.Handler = nested_handler;
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newframe.prevFrame = frame;
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EXC_push_frame( &newframe.frame );
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TRACE( "calling handler at %p\n", handler );
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ret = handler( record, frame, context, dispatcher );
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TRACE( "handler returned %lx\n", ret );
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EXC_pop_frame( &newframe.frame );
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return ret;
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}
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/*******************************************************************
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* EXC_DefaultHandling
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*
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* Default handling for exceptions. Called when we didn't find a suitable handler.
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*/
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static void EXC_DefaultHandling( EXCEPTION_RECORD *rec, CONTEXT *context )
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{
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if (rec->ExceptionFlags & EH_STACK_INVALID)
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ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
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else if (rec->ExceptionCode == EXCEPTION_NONCONTINUABLE_EXCEPTION)
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ERR("Process attempted to continue execution after noncontinuable exception.\n");
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else
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ERR("Unhandled exception code %lx flags %lx addr %p\n",
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rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
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/* Should I add here a back trace ? */
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TerminateProcess( GetCurrentProcess(), 1 );
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}
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/*******************************************************************
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* EXC_RaiseException
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*
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* Implementation of NtRaiseException.
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*/
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static void EXC_RaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
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{
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PEXCEPTION_FRAME frame, dispatch, nested_frame;
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EXCEPTION_RECORD newrec;
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DWORD res;
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frame = NtCurrentTeb()->except;
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nested_frame = NULL;
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while (frame != (PEXCEPTION_FRAME)0xFFFFFFFF)
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{
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/* Check frame address */
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if (((void*)frame < NtCurrentTeb()->stack_low) ||
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((void*)(frame+1) > NtCurrentTeb()->stack_top) ||
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(int)frame & 3)
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{
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rec->ExceptionFlags |= EH_STACK_INVALID;
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break;
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}
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/* Call handler */
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res = EXC_CallHandler( frame->Handler, EXC_RaiseHandler, rec, frame, context, &dispatch );
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if (frame == nested_frame)
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{
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/* no longer nested */
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nested_frame = NULL;
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rec->ExceptionFlags &= ~EH_NESTED_CALL;
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}
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switch(res)
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{
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case ExceptionContinueExecution:
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if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return;
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newrec.ExceptionCode = STATUS_NONCONTINUABLE_EXCEPTION;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = rec;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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break;
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case ExceptionContinueSearch:
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break;
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case ExceptionNestedException:
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if (nested_frame < dispatch) nested_frame = dispatch;
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rec->ExceptionFlags |= EH_NESTED_CALL;
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break;
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default:
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newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = rec;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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break;
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}
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frame = frame->Prev;
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}
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EXC_DefaultHandling( rec, context );
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}
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/*******************************************************************
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* EXC_RtlUnwind
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*
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* Implementation of RtlUnwind.
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*/
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static void EXC_RtlUnwind( EXCEPTION_FRAME *pEndFrame, EXCEPTION_RECORD *pRecord,
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CONTEXT *context )
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{
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EXCEPTION_RECORD record, newrec;
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PEXCEPTION_FRAME frame, dispatch;
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/* build an exception record, if we do not have one */
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if (!pRecord)
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{
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record.ExceptionCode = STATUS_UNWIND;
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record.ExceptionFlags = 0;
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record.ExceptionRecord = NULL;
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record.ExceptionAddress = (LPVOID)EIP_reg(context);
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record.NumberParameters = 0;
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pRecord = &record;
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}
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pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
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/* get chain of exception frames */
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frame = NtCurrentTeb()->except;
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while ((frame != (PEXCEPTION_FRAME)0xffffffff) && (frame != pEndFrame))
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{
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/* Check frame address */
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if (pEndFrame && (frame > pEndFrame))
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{
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newrec.ExceptionCode = STATUS_INVALID_UNWIND_TARGET;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = pRecord;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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}
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if (((void*)frame < NtCurrentTeb()->stack_low) ||
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((void*)(frame+1) > NtCurrentTeb()->stack_top) ||
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(int)frame & 3)
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{
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newrec.ExceptionCode = STATUS_BAD_STACK;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = pRecord;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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}
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/* Call handler */
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switch(EXC_CallHandler( frame->Handler, EXC_UnwindHandler, pRecord,
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frame, context, &dispatch ))
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{
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case ExceptionContinueSearch:
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break;
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case ExceptionCollidedUnwind:
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frame = dispatch;
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break;
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default:
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newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
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newrec.ExceptionFlags = EH_NONCONTINUABLE;
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newrec.ExceptionRecord = pRecord;
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newrec.NumberParameters = 0;
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RtlRaiseException( &newrec ); /* never returns */
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break;
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}
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NtCurrentTeb()->except = frame = frame->Prev;
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}
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}
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/*******************************************************************
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* NtRaiseException (NTDLL.175)
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*
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* Real prototype:
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* DWORD WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first );
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*/
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REGS_ENTRYPOINT(NtRaiseException)
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{
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DWORD ret;
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EXCEPTION_RECORD *rec;
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CONTEXT *ctx;
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BOOL first;
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ret = STACK32_POP(context); /* return addr */
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rec = (PEXCEPTION_RECORD)STACK32_POP(context);
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ctx = (PCONTEXT)STACK32_POP(context);
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first = (BOOL)STACK32_POP(context);
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STACK32_PUSH(context,ret); /* restore return addr */
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EXC_RaiseException( rec, ctx );
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*context = *ctx;
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}
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/***********************************************************************
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* RtlRaiseException (NTDLL.464)
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*
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* Real prototype:
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* void WINAPI RtlRaiseException(PEXCEPTION_RECORD pRecord)
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*/
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REGS_ENTRYPOINT(RtlRaiseException)
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{
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EXCEPTION_RECORD *rec;
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DWORD ret;
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ret = STACK32_POP(context); /* return addr */
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rec = (PEXCEPTION_RECORD)STACK32_POP(context);
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STACK32_PUSH(context,ret); /* restore return addr */
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rec->ExceptionAddress = (LPVOID)EIP_reg(context);
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EXC_RaiseException( rec, context );
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}
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/*******************************************************************
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* RtlUnwind (KERNEL32.590) (NTDLL.518)
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*
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* The real prototype is:
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* void WINAPI RtlUnwind( PEXCEPTION_FRAME pEndFrame, LPVOID unusedEip,
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* PEXCEPTION_RECORD pRecord, DWORD returnEax );
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*/
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REGS_ENTRYPOINT(RtlUnwind)
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{
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PEXCEPTION_FRAME pEndFrame;
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PEXCEPTION_RECORD pRecord;
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/* get the arguments from the stack */
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DWORD ret = STACK32_POP(context); /* return addr */
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pEndFrame = (PEXCEPTION_FRAME)STACK32_POP(context);
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(void)STACK32_POP(context); /* unused arg */
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pRecord = (PEXCEPTION_RECORD)STACK32_POP(context);
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EAX_reg(context) = STACK32_POP(context);
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STACK32_PUSH(context,ret); /* restore return addr */
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EXC_RtlUnwind( pEndFrame, pRecord, context );
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}
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/***********************************************************************
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* RtlRaiseStatus (NTDLL.465)
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*
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* Raise an exception with ExceptionCode = status
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*/
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void WINAPI RtlRaiseStatus( NTSTATUS status )
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{
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EXCEPTION_RECORD ExceptionRec;
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ExceptionRec.ExceptionCode = status;
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ExceptionRec.ExceptionFlags = EH_NONCONTINUABLE;
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ExceptionRec.ExceptionRecord = NULL;
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ExceptionRec.NumberParameters = 0;
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RtlRaiseException( &ExceptionRec );
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}
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