| /* |
| * NT exception handling routines |
| * |
| * Copyright 1999 Turchanov Sergey |
| * Copyright 1999 Alexandre Julliard |
| */ |
| |
| #include <signal.h> |
| #include "winnt.h" |
| #include "ntddk.h" |
| #include "process.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; |
| EXC_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 ); |
| EXC_pop_frame( &newframe.frame ); |
| return ret; |
| } |
| |
| |
| /********************************************************************** |
| * EXC_SendEvent |
| * |
| * Send an EXCEPTION_DEBUG_EVENT event to the debugger. |
| */ |
| static inline int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context ) |
| { |
| struct exception_event_request *req = get_req_buffer(); |
| req->record = *rec; |
| req->first = first_chance; |
| req->context = *context; |
| if (!server_call_noerr( REQ_EXCEPTION_EVENT )) *context = req->context; |
| return req->status; |
| } |
| |
| |
| /******************************************************************* |
| * 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 ); |
| TerminateProcess( GetCurrentProcess(), 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 = EXC_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 ); |
| } |
