RtlpGetStackLimitsEx

BOOL __stdcall RtlpGetStackLimitsEx(UINT64 a1, CHAR **a2, UINT64 *a3){
  BOOL result; 
  char v4; 

  result = KeQueryCurrentStackInformationEx(a1, &v4, (struct _KPRCB **)a2, a3);
  if( !result )
    __fastfail(4u);
  return result;
}

Referenced by:

RtlDispatchException
RtlUnwindEx