110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
/*
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* Win32 exception functions
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*
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* Copyright (c) 1996 Onno Hovers, (onno@stack.urc.tue.nl)
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* Copyright (c) 1999 Alexandre Julliard
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*
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* Notes:
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* What really happens behind the scenes of those new
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* __try{...}__except(..){....} and
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* __try{...}__finally{...}
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* statements is simply not documented by Microsoft. There could be different
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* reasons for this:
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* One reason could be that they try to hide the fact that exception
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* handling in Win32 looks almost the same as in OS/2 2.x.
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* Another reason could be that Microsoft does not want others to write
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* binary compatible implementations of the Win32 API (like us).
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*
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* Whatever the reason, THIS SUCKS!! Ensuring portabilty or future
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* compatability may be valid reasons to keep some things undocumented.
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* But exception handling is so basic to Win32 that it should be
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* documented!
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*
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* Fixmes:
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* -Most functions need better parameter checking.
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* -I do not know how to handle exceptions within an exception handler.
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* or what is done when ExceptionNestedException is returned from an
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* exception handler
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* -Real exceptions are not yet implemented. only the exception functions
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* are implemented. A real implementation needs some new code in
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* loader/signal.c. There would also be a need for showing debugging
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* information in UnhandledExceptionFilter.
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*
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*/
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#include <assert.h>
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#include "winuser.h"
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#include "winerror.h"
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#include "ldt.h"
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#include "process.h"
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#include "thread.h"
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#include "debugtools.h"
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#include "except.h"
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#include "stackframe.h"
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DEFAULT_DEBUG_CHANNEL(seh)
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/*******************************************************************
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* RaiseException (KERNEL32.418)
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*/
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void WINAPI RaiseException( DWORD code, DWORD flags, DWORD nbargs, const LPDWORD args )
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{
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EXCEPTION_RECORD record;
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/* Compose an exception record */
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record.ExceptionCode = code;
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record.ExceptionFlags = flags & EH_NONCONTINUABLE;
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record.ExceptionRecord = NULL;
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record.ExceptionAddress = RaiseException;
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if (nbargs && args)
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{
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if (nbargs > EXCEPTION_MAXIMUM_PARAMETERS) nbargs = EXCEPTION_MAXIMUM_PARAMETERS;
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record.NumberParameters = nbargs;
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memcpy( record.ExceptionInformation, args, nbargs * sizeof(*args) );
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}
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else record.NumberParameters = 0;
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RtlRaiseException( &record );
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}
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/*******************************************************************
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* UnhandledExceptionFilter (KERNEL32.537)
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*/
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DWORD WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
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{
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char message[80];
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PDB *pdb = PROCESS_Current();
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/* FIXME: Should check if the process is being debugged */
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if (pdb->top_filter)
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{
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DWORD ret = pdb->top_filter( epointers );
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if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
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}
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/* FIXME: Should check the current error mode */
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sprintf( message, "Unhandled exception 0x%08lx at address 0x%08lx.",
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epointers->ExceptionRecord->ExceptionCode,
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(DWORD)epointers->ExceptionRecord->ExceptionAddress );
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MessageBoxA( 0, message, "Error", MB_OK | MB_ICONHAND );
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return EXCEPTION_EXECUTE_HANDLER;
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}
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/*************************************************************
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* SetUnhandledExceptionFilter (KERNEL32.516)
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*/
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LPTOP_LEVEL_EXCEPTION_FILTER WINAPI SetUnhandledExceptionFilter(
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LPTOP_LEVEL_EXCEPTION_FILTER filter )
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{
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PDB *pdb = PROCESS_Current();
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LPTOP_LEVEL_EXCEPTION_FILTER old = pdb->top_filter;
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pdb->top_filter = filter;
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return old;
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}
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