| /* |
| * 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 "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; |
| |
| |
| #ifdef __i386__ |
| # define GET_IP(context) ((LPVOID)(context)->Eip) |
| #else |
| # error You must define GET_IP for this CPU |
| #endif /* __i386__ */ |
| |
| /* Default hook for built-in debugger */ |
| static DWORD default_hook( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first ) |
| { |
| if (!first) |
| { |
| DPRINTF( "stopping process due to unhandled exception %08lx.\n", |
| rec->ExceptionCode ); |
| raise( SIGSTOP ); |
| } |
| return 0; /* not handled */ |
| } |
| static DEBUGHOOK debug_hook = default_hook; |
| |
| /******************************************************************* |
| * EXC_SetDebugEventHook |
| * EXC_GetDebugEventHook |
| * |
| * Set/Get the hook for the built-in debugger. |
| * |
| * FIXME: the built-in debugger should use the normal debug events. |
| */ |
| void EXC_SetDebugEventHook( DEBUGHOOK hook ) |
| { |
| debug_hook = hook; |
| } |
| DEBUGHOOK EXC_GetDebugEventHook(void) |
| { |
| return debug_hook; |
| } |
| |
| /******************************************************************* |
| * 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 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_DefaultHandling |
| * |
| * Default handling for exceptions. Called when we didn't find a suitable handler. |
| */ |
| static void EXC_DefaultHandling( EXCEPTION_RECORD *rec, CONTEXT *context ) |
| { |
| if ((PROCESS_Current()->flags & PDB32_DEBUGGED) && |
| (DEBUG_SendExceptionEvent( rec, FALSE ) == DBG_CONTINUE)) |
| return; /* continue execution */ |
| |
| if (debug_hook( rec, context, FALSE ) == 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 ); |
| } |
| |
| |
| /*********************************************************************** |
| * RtlRaiseException (NTDLL.464) |
| */ |
| void WINAPI REGS_FUNC(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 ((PROCESS_Current()->flags & PDB32_DEBUGGED) && |
| (DEBUG_SendExceptionEvent( rec, TRUE ) == DBG_CONTINUE)) |
| return; /* continue execution */ |
| |
| if (debug_hook( rec, context, TRUE ) == 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( 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; |
| |
| #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( 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; |
| } |
| frame = EXC_pop_frame( frame ); |
| } |
| } |
| |
| |
| /******************************************************************* |
| * 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 ); |
| } |
| |
| |
| /*********************************************************************** |
| * DebugBreak (KERNEL32.181) |
| */ |
| void WINAPI REGS_FUNC(DebugBreak)( CONTEXT *context ) |
| { |
| EXCEPTION_RECORD rec; |
| |
| rec.ExceptionCode = EXCEPTION_BREAKPOINT; |
| rec.ExceptionFlags = 0; |
| rec.ExceptionRecord = NULL; |
| rec.NumberParameters = 0; |
| REGS_FUNC(RtlRaiseException)( &rec, context ); |
| } |
| |
| |
| /*********************************************************************** |
| * DebugBreak16 (KERNEL.203) |
| */ |
| void WINAPI DebugBreak16( CONTEXT86 *context ) |
| { |
| #ifdef __i386__ |
| REGS_FUNC(DebugBreak)( context ); |
| #endif /* defined(__i386__) */ |
| } |
