return callee_fp;
if (VM_Interface.refInVM(ip)) { return fp; } else { return callee_fp; }  return callee_fp;
  public static VM_Address unwindNativeStackFrame(VM_Address currfp) throws VM_PragmaUninterruptible {    VM_Address ip, callee_fp;    VM_Address fp = VM_Magic.getCallerFramePointer(currfp);    do {      callee_fp = fp;      ip = VM_Magic.getReturnAddress(fp);      fp = VM_Magic.getCallerFramePointer(fp);    } while ( !VM_Interface.refInVM(ip) && fp.toInt() != STACKFRAME_SENTINAL_FP);    return callee_fp;  }