mirror of
https://github.com/reactos/wine.git
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9caa71eef4
data to be exchanged. Split request and reply structures to make backwards compatibility easier. Moved many console functions to dlls/kernel, added code page support, changed a few requests to behave properly with the new protocol.
395 lines
13 KiB
C
395 lines
13 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 "config.h"
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#include <assert.h>
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#include <signal.h>
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#include "winnt.h"
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#include "ntddk.h"
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#include "global.h"
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#include "wine/exception.h"
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#include "stackframe.h"
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#include "miscemu.h"
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#include "wine/server.h"
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#include "debugtools.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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#ifdef __i386__
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# define GET_IP(context) ((LPVOID)(context)->Eip)
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#endif
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#ifdef __sparc__
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# define GET_IP(context) ((LPVOID)(context)->pc)
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#endif
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#ifndef GET_IP
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# error You must define GET_IP for this CPU
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#endif
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extern void SIGNAL_Unblock(void);
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void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
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void WINAPI EXC_RtlUnwind( PEXCEPTION_FRAME, LPVOID,
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PEXCEPTION_RECORD, DWORD, PCONTEXT );
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void WINAPI EXC_NtRaiseException( PEXCEPTION_RECORD, PCONTEXT,
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BOOL, PCONTEXT );
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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 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 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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* Please do not change the first 4 parameters order in any way - some exceptions handlers
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* rely on Base Pointer (EBP) to have a fixed position related to the exception frame
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*/
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static DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
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CONTEXT *context, EXCEPTION_FRAME **dispatcher,
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PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler)
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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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__wine_push_frame( &newframe.frame );
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TRACE( "calling handler at %p code=%lx flags=%lx\n",
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handler, record->ExceptionCode, record->ExceptionFlags );
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ret = handler( record, frame, context, dispatcher );
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TRACE( "handler returned %lx\n", ret );
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__wine_pop_frame( &newframe.frame );
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return ret;
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}
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/**********************************************************************
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* send_debug_event
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*
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* Send an EXCEPTION_DEBUG_EVENT event to the debugger.
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*/
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static int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
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{
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int ret;
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HANDLE handle = 0;
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SERVER_START_REQ( queue_exception_event )
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{
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req->first = first_chance;
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wine_server_add_data( req, context, sizeof(*context) );
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wine_server_add_data( req, rec, sizeof(*rec) );
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if (!wine_server_call( req )) handle = reply->handle;
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}
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SERVER_END_REQ;
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if (!handle) return 0; /* no debugger present or other error */
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/* No need to wait on the handle since the process gets suspended
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* once the event is passed to the debugger, so when we get back
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* here the event has been continued already.
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*/
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SERVER_START_REQ( get_exception_status )
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{
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req->handle = handle;
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wine_server_set_reply( req, context, sizeof(*context) );
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wine_server_call( req );
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ret = reply->status;
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}
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SERVER_END_REQ;
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NtClose( handle );
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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 (send_debug_event( rec, FALSE, context ) == DBG_CONTINUE) return; /* continue execution */
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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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NtTerminateProcess( NtCurrentProcess(), 1 );
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}
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/***********************************************************************
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* RtlRaiseException (NTDLL.@)
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*/
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DEFINE_REGS_ENTRYPOINT_1( RtlRaiseException, EXC_RtlRaiseException, EXCEPTION_RECORD * );
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void WINAPI EXC_RtlRaiseException( 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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TRACE( "code=%lx flags=%lx\n", rec->ExceptionCode, rec->ExceptionFlags );
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if (send_debug_event( rec, TRUE, context ) == DBG_CONTINUE) return; /* continue execution */
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SIGNAL_Unblock(); /* we may be in a signal handler, and exception handlers may jump out */
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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( rec, frame, context, &dispatch, frame->Handler, EXC_RaiseHandler );
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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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* RtlUnwind (NTDLL.@)
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*/
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DEFINE_REGS_ENTRYPOINT_4( RtlUnwind, EXC_RtlUnwind,
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PEXCEPTION_FRAME, LPVOID, PEXCEPTION_RECORD, DWORD );
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void WINAPI EXC_RtlUnwind( PEXCEPTION_FRAME pEndFrame, LPVOID unusedEip,
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PEXCEPTION_RECORD pRecord, DWORD returnEax,
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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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#ifdef __i386__
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context->Eax = returnEax;
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#endif
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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 = GET_IP(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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TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
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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( pRecord, frame, context, &dispatch,
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frame->Handler, EXC_UnwindHandler ))
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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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frame = __wine_pop_frame( frame );
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}
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}
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/*******************************************************************
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* NtRaiseException (NTDLL.@)
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*/
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DEFINE_REGS_ENTRYPOINT_3( NtRaiseException, EXC_NtRaiseException,
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EXCEPTION_RECORD *, CONTEXT *, BOOL );
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void WINAPI EXC_NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx,
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BOOL first, CONTEXT *context )
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{
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EXC_RtlRaiseException( rec, ctx );
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*context = *ctx;
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}
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/***********************************************************************
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* RtlRaiseStatus (NTDLL.@)
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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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/*************************************************************
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* __wine_exception_handler (NTDLL.@)
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*
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* Exception handler for exception blocks declared in Wine code.
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*/
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DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
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CONTEXT *context, LPVOID pdispatcher )
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{
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__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
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if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
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return ExceptionContinueSearch;
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if (wine_frame->u.filter)
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{
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EXCEPTION_POINTERS ptrs;
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ptrs.ExceptionRecord = record;
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ptrs.ContextRecord = context;
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switch(wine_frame->u.filter( &ptrs ))
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{
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case EXCEPTION_CONTINUE_SEARCH:
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return ExceptionContinueSearch;
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case EXCEPTION_CONTINUE_EXECUTION:
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return ExceptionContinueExecution;
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case EXCEPTION_EXECUTE_HANDLER:
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break;
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default:
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MESSAGE( "Invalid return value from exception filter\n" );
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assert( FALSE );
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}
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}
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/* hack to make GetExceptionCode() work in handler */
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wine_frame->ExceptionCode = record->ExceptionCode;
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wine_frame->ExceptionRecord = wine_frame;
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RtlUnwind( frame, 0, record, 0 );
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__wine_pop_frame( frame );
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longjmp( wine_frame->jmp, 1 );
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}
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/*************************************************************
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* __wine_finally_handler (NTDLL.@)
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*
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* Exception handler for try/finally blocks declared in Wine code.
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*/
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DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
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CONTEXT *context, LPVOID pdispatcher )
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{
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__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
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if (!(record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
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return ExceptionContinueSearch;
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wine_frame->u.finally_func( FALSE );
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return ExceptionContinueSearch;
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}
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