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/*
* 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 "sig_context.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)EIP_reg(context))
#else
# define GET_IP(context) ((LPVOID)0)
#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__
EAX_reg(context) = 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 = EH_NONCONTINUABLE;
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__) */
}
/***********************************************************************
* EXC_SaveContext
*
* Set the register values from a sigcontext.
*/
static void EXC_SaveContext( CONTEXT *context, const SIGCONTEXT *sigcontext )
{
#ifdef __i386__
EAX_reg(context) = EAX_sig(sigcontext);
EBX_reg(context) = EBX_sig(sigcontext);
ECX_reg(context) = ECX_sig(sigcontext);
EDX_reg(context) = EDX_sig(sigcontext);
ESI_reg(context) = ESI_sig(sigcontext);
EDI_reg(context) = EDI_sig(sigcontext);
EBP_reg(context) = EBP_sig(sigcontext);
EFL_reg(context) = EFL_sig(sigcontext);
EIP_reg(context) = EIP_sig(sigcontext);
ESP_reg(context) = ESP_sig(sigcontext);
CS_reg(context) = LOWORD(CS_sig(sigcontext));
DS_reg(context) = LOWORD(DS_sig(sigcontext));
ES_reg(context) = LOWORD(ES_sig(sigcontext));
SS_reg(context) = LOWORD(SS_sig(sigcontext));
#ifdef FS_sig
FS_reg(context) = LOWORD(FS_sig(sigcontext));
#else
GET_FS( FS_reg(context) );
FS_reg(context) &= 0xffff;
#endif
#ifdef GS_sig
GS_reg(context) = LOWORD(GS_sig(sigcontext));
#else
GET_GS( GS_reg(context) );
GS_reg(context) &= 0xffff;
#endif
if (ISV86(context)) V86BASE(context) = (DWORD)DOSMEM_MemoryBase(0);
#endif /* __i386__ */
}
/***********************************************************************
* EXC_RestoreContext
*
* Build a sigcontext from the register values.
*/
static void EXC_RestoreContext( const CONTEXT *context, SIGCONTEXT *sigcontext )
{
#ifdef __i386__
EAX_sig(sigcontext) = EAX_reg(context);
EBX_sig(sigcontext) = EBX_reg(context);
ECX_sig(sigcontext) = ECX_reg(context);
EDX_sig(sigcontext) = EDX_reg(context);
ESI_sig(sigcontext) = ESI_reg(context);
EDI_sig(sigcontext) = EDI_reg(context);
EBP_sig(sigcontext) = EBP_reg(context);
EFL_sig(sigcontext) = EFL_reg(context);
EIP_sig(sigcontext) = EIP_reg(context);
ESP_sig(sigcontext) = ESP_reg(context);
CS_sig(sigcontext) = CS_reg(context);
DS_sig(sigcontext) = DS_reg(context);
ES_sig(sigcontext) = ES_reg(context);
SS_sig(sigcontext) = SS_reg(context);
#ifdef FS_sig
FS_sig(sigcontext) = FS_reg(context);
#else
SET_FS( FS_reg(context) );
#endif
#ifdef GS_sig
GS_sig(sigcontext) = GS_reg(context);
#else
SET_GS( GS_reg(context) );
#endif
#endif /* __i386__ */
}
/**********************************************************************
* EXC_segv
*
* Handler for SIGSEGV and related errors.
*/
static HANDLER_DEF(EXC_segv)
{
EXCEPTION_RECORD rec;
CONTEXT context;
HANDLER_INIT();
#if defined(TRAP_sig) && defined(CR2_sig)
/* we want the page-fault case to be fast */
if (TRAP_sig(HANDLER_CONTEXT) == 14)
if (VIRTUAL_HandleFault( (LPVOID)CR2_sig(HANDLER_CONTEXT) )) return;
#endif
EXC_SaveContext( &context, HANDLER_CONTEXT );
rec.ExceptionRecord = NULL;
rec.ExceptionFlags = EH_NONCONTINUABLE;
rec.ExceptionAddress = GET_IP(&context);
rec.NumberParameters = 0;
#ifdef TRAP_sig
switch(TRAP_sig(HANDLER_CONTEXT))
{
case 4: /* Overflow exception */
rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
break;
case 5: /* Bound range exception */
rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
break;
case 6: /* Invalid opcode exception */
rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
case 12: /* Stack fault */
rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
break;
case 11: /* Segment not present exception */
case 13: /* General protection fault */
if (INSTR_EmulateInstruction( &context )) goto restore;
rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
break;
case 14: /* Page fault */
#ifdef CR2_sig
rec.NumberParameters = 2;
#ifdef ERROR_sig
rec.ExceptionInformation[0] = (ERROR_sig(HANDLER_CONTEXT) & 2) != 0;
#else
rec.ExceptionInformation[0] = 0;
#endif /* ERROR_sig */
rec.ExceptionInformation[1] = CR2_sig(HANDLER_CONTEXT);
#endif /* CR2_sig */
rec.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
break;
case 17: /* Alignment check exception */
/* FIXME: pass through exception handler first? */
if (EFL_reg(&context) & 0x00040000)
{
/* Disable AC flag, return */
EFL_reg(&context) &= ~0x00040000;
goto restore;
}
rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
break;
default:
ERR( "Got unexpected trap %ld\n", TRAP_sig(HANDLER_CONTEXT) );
/* fall through */
case 2: /* NMI interrupt */
case 7: /* Device not available exception */
case 8: /* Double fault exception */
case 10: /* Invalid TSS exception */
case 15: /* Unknown exception */
case 18: /* Machine check exception */
case 19: /* Cache flush exception */
rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
}
#else /* TRAP_sig */
# ifdef __i386
if (INSTR_EmulateInstruction( &context )) return;
# endif
rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION; /* generic error */
#endif /* TRAP_sig */
REGS_FUNC(RtlRaiseException)( &rec, &context );
restore:
EXC_RestoreContext( &context, HANDLER_CONTEXT );
}
/**********************************************************************
* EXC_trap
*
* Handler for SIGTRAP.
*/
static HANDLER_DEF(EXC_trap)
{
EXCEPTION_RECORD rec;
CONTEXT context;
HANDLER_INIT();
#ifdef TRAP_sig
rec.ExceptionCode = (TRAP_sig(HANDLER_CONTEXT) == 1) ?
EXCEPTION_SINGLE_STEP : EXCEPTION_BREAKPOINT;
#else
rec.ExceptionCode = EXCEPTION_BREAKPOINT;
#endif /* TRAP_sig */
EXC_SaveContext( &context, HANDLER_CONTEXT );
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = GET_IP(&context);
rec.NumberParameters = 0;
REGS_FUNC(RtlRaiseException)( &rec, &context );
EXC_RestoreContext( &context, HANDLER_CONTEXT );
}
/***********************************************************************
* EXC_SaveFPU
*
* Set the FPU context from a sigcontext.
*/
static void inline EXC_SaveFPU( CONTEXT *context, const SIGCONTEXT *sigcontext )
{
#ifdef __i386__
# ifdef FPU_sig
if (FPU_sig(sigcontext))
{
context->FloatSave = *FPU_sig(sigcontext);
return;
}
# endif /* FPU_sig */
# ifdef __GNUC__
__asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
# endif /* __GNUC__ */
#endif /* __i386__ */
}
/***********************************************************************
* EXC_RestoreFPU
*
* Restore the FPU context to a sigcontext.
*/
static void inline EXC_RestoreFPU( CONTEXT *context, const SIGCONTEXT *sigcontext )
{
#ifdef __i386__
# ifdef FPU_sig
if (FPU_sig(sigcontext))
{
*FPU_sig(sigcontext) = context->FloatSave;
return;
}
# endif /* FPU_sig */
# ifdef __GNUC__
/* avoid nested exceptions */
context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
__asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
# endif /* __GNUC__ */
#endif /* __i386__ */
}
/**********************************************************************
* EXC_GetFPUCode
*
* Get the FPU exception code from the FPU status.
*/
static inline DWORD EXC_GetFPUCode( const CONTEXT *context )
{
#ifdef __i386__
DWORD status = context->FloatSave.StatusWord;
if (status & 0x01) /* IE */
{
if (status & 0x40) /* SF */
return EXCEPTION_FLT_STACK_CHECK;
else
return EXCEPTION_FLT_INVALID_OPERATION;
}
if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
#endif /* __i386__ */
return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
}
/**********************************************************************
* EXC_fpe
*
* Handler for SIGFPE.
*/
static HANDLER_DEF(EXC_fpe)
{
EXCEPTION_RECORD rec;
CONTEXT context;
HANDLER_INIT();
EXC_SaveFPU( &context, HANDLER_CONTEXT );
#ifdef TRAP_sig
switch(TRAP_sig(HANDLER_CONTEXT))
{
case 0: /* Division by zero exception */
rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
break;
case 9: /* Coprocessor segment overrun */
rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
case 16: /* Floating point exception */
rec.ExceptionCode = EXC_GetFPUCode( &context );
break;
default:
ERR( "Got unexpected trap %ld\n", TRAP_sig(HANDLER_CONTEXT) );
rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
}
#else /* TRAP_sig */
rec.ExceptionCode = EXC_GetFPUCode( &context );
#endif /* TRAP_sig */
EXC_SaveContext( &context, HANDLER_CONTEXT );
rec.ExceptionFlags = EH_NONCONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = GET_IP(&context);
rec.NumberParameters = 0;
REGS_FUNC(RtlRaiseException)( &rec, &context );
EXC_RestoreContext( &context, HANDLER_CONTEXT );
EXC_RestoreFPU( &context, HANDLER_CONTEXT );
}
/**********************************************************************
* EXC_int
*
* Handler for SIGINT.
*/
static HANDLER_DEF(EXC_int)
{
EXCEPTION_RECORD rec;
CONTEXT context;
HANDLER_INIT();
EXC_SaveContext( &context, HANDLER_CONTEXT );
rec.ExceptionCode = CONTROL_C_EXIT;
rec.ExceptionFlags = EH_NONCONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = GET_IP(&context);
rec.NumberParameters = 0;
REGS_FUNC(RtlRaiseException)( &rec, &context );
EXC_RestoreContext( &context, HANDLER_CONTEXT );
}
/**********************************************************************
* EXC_InitHandlers
*
* Initialize the signal handlers for exception handling.
*/
void EXC_InitHandlers(void)
{
SIGNAL_SetHandler( SIGINT, (void (*)())EXC_int, 1 );
SIGNAL_SetHandler( SIGFPE, (void (*)())EXC_fpe, 1 );
SIGNAL_SetHandler( SIGSEGV, (void (*)())EXC_segv, 1 );
SIGNAL_SetHandler( SIGILL, (void (*)())EXC_segv, 1 );
#ifdef SIGBUS
SIGNAL_SetHandler( SIGBUS, (void (*)())EXC_segv, 1 );
#endif
#ifdef SIGTRAP
SIGNAL_SetHandler( SIGTRAP, (void (*)())EXC_trap, 1 );
#endif
return;
}
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