RtlpGetStackLimits

UINT8 __stdcall RtlpGetStackLimits(UINT64 *LowLimit, UINT64 *HighLimit){
  UINT64 v4; 
  UINT8 result; 
  int a2; 
  LODWORD(v4) = KeGetCurrentStackPointer((UINT64)LowLimit, (KPROFILE_SOURCE)HighLimit);
  result = KeQueryCurrentStackInformationEx(v4, &a2, (CHAR **)LowLimit, HighLimit);
  if( !result )
    __fastfail(4u);
  return result;
}

Referenced by:

IoGetStackLimits
MmVerifierTrimMemory
PspGetSetContextInternal
RtlEnoughStackSpaceForStackCapture
RtlUnwindEx
RtlWalkFrameChain
RtlpWalkFrameChain
ViKeWaitSanityChecks