/*************************************************************
* __wine_exception_handler (NTDLL.@)
*
* Exception handler for exception blocks declared in Wine code.
*/
DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
CONTEXT *context, LPVOID pdispatcher )
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
return ExceptionContinueSearch;
if (wine_frame->u.filter)
{
EXCEPTION_POINTERS ptrs;
ptrs.ExceptionRecord = record;
ptrs.ContextRecord = context;
switch(wine_frame->u.filter( &ptrs ))
{
case EXCEPTION_CONTINUE_SEARCH:
return ExceptionContinueSearch;
case EXCEPTION_CONTINUE_EXECUTION:
return ExceptionContinueExecution;
case EXCEPTION_EXECUTE_HANDLER:
break;
default:
MESSAGE( "Invalid return value from exception filter\n" );
assert( FALSE );
}
}
/* hack to make GetExceptionCode() work in handler */
wine_frame->ExceptionCode = record->ExceptionCode;
wine_frame->ExceptionRecord = wine_frame;
RtlUnwind( frame, 0, record, 0 );
__wine_pop_frame( frame );
longjmp( wine_frame->jmp, 1 );
}
VOID
longjmp (
IN jmp_buf JumpBuffer,
IN int ReturnValue
)
/*++
Routine Description:
This function executes a long jump operation by virtually unwinding to
the caller of the corresponding call to set jump and then calling unwind
to transfer control to the jump target.
Arguments:
JumpBuffer - Supplies the address of a jump buffer that contains the
virtual frame pointer and target address.
N.B. This is an array of double to force quadword alignment.
ReturnValue - Supplies the value that is to be returned to the caller
of set jump.
Return Value:
None.
--*/
{
PULONG JumpArray;
//
// If the specified return value is zero, then set it to one.
//
if (ReturnValue == 0) {
ReturnValue = 1;
}
//
// Unwind to the caller of set jump and return the specified value.
// There is no return from unwind.
//
JumpArray = (PULONG)&JumpBuffer[0];
RtlUnwind((PVOID)JumpArray[0],
(PVOID)JumpArray[1],
NULL,
(PVOID)ReturnValue);
}
/*******************************************************************
* longjmp (MSVCRT.@)
*/
void __cdecl MSVCRT_longjmp(struct MSVCRT___JUMP_BUFFER *jmp, int retval)
{
EXCEPTION_RECORD rec;
if (!retval) retval = 1;
if (jmp->Frame)
{
rec.ExceptionCode = STATUS_LONGJUMP;
rec.ExceptionFlags = 0;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = NULL;
rec.NumberParameters = 1;
rec.ExceptionInformation[0] = (DWORD_PTR)jmp;
RtlUnwind((void *)jmp->Frame, (void *)jmp->Pc, &rec, IntToPtr(retval));
}
longjmp_set_regs(jmp, retval);
}
void longjmpex( jmp_buf jb, int ret )
{
EXCEPTION_RECORD er;
_JUMPEXDATA *jd = (_JUMPEXDATA *)jb;
er.ExceptionCode = 0xE5670123;
er.ExceptionFlags = 0x00000002;
er.ExceptionRecord = 0L;
er.ExceptionAddress = 0L;
er.NumberParameters = 1L;
er.ExceptionInformation[0] = jd->sp;
if( !_ProcSetsFP( RtlLookupFunctionEntry( jd->pc ) ) )
RtlUnwind( (void *)jd->sp, (void *)jd->pc, &er, (void *)ret );
else
RtlUnwindRfp( jd->fp, jd->pc, &er, ret );
} /* longjmp() */
void __stdcall _UnwindNestedFrames(
EHRegistrationNode *pRN, // Unwind up to (but not including) this frame
EHExceptionRecord *pExcept // The exception that initiated this unwind
) {
EHTRACE_ENTER;
void* pReturnPoint;
EHRegistrationNode *pDispatcherRN; // Magic!
__asm {
//
// Save the dispatcher's marker node
//
// NOTE: RtlUnwind will trash the callee-save regs EBX, ESI, and EDI.
// We explicitly use them here in the inline-asm so they get preserved
// and restored by the function prologue/epilogue.
//
mov esi, dword ptr FS:[0] // use ESI
mov pDispatcherRN, esi
}
__asm mov pReturnPoint, offset ReturnPoint
RtlUnwind(pRN, pReturnPoint, (PEXCEPTION_RECORD)pExcept, nullptr);
ReturnPoint:
PER_FLAGS(pExcept) &= ~EXCEPTION_UNWINDING; // Clear the 'Unwinding' flag
// in case exception is rethrown
__asm {
//
// Re-link the dispatcher's marker node
//
mov edi, dword ptr FS:[0] // Get the current head (use EDI)
mov ebx, pDispatcherRN // Get the saved head (use EBX)
mov [ebx], edi // Link saved head to current head
mov dword ptr FS:[0], ebx // Make saved head current head
}
EHTRACE_EXIT;
return;
}
void CPPLIB( PdUnwind ) // UNWIND USING PROCEDURE DESCRIPTORS
( FsExcRec* exc_rec ) // - exception record
{
DISPATCH_EXC* dispatch; // - dispatch control
RW_DTREG* rw; // - R/W block being dispatched
void* frame; // - frame for rtn. (SP or FP)
void* pc; // - PC for continuation (after the setjmp)
_CONTEXT ctx; // - context for function
unsigned save_area[3*2]; // - save area
RtlCaptureContext( &ctx );
pc = CPPLIB( PdCtx )( &ctx, save_area );
if( pc ) {
dispatch = exc_rec->dispatch;
rw = dispatch->rw;
frame = (void*)( (char*)rw - rw->base.ro->fun.rw_offset );
if( procSetsFP( dispatch->pdata ) ) {
RtlUnwindRfp( frame, pc, exc_rec, save_area );
} else {
RtlUnwind( frame, pc, exc_rec, save_area );
}
}
}
void _global_unwind2(PEXCEPTION_FRAME frame) {
RtlUnwind(frame, 0, 0, 0);
}