Porting of C library Testing of generated compiler

For testing the automatically generated C compiler for embedded systems on the simulator, it is necessary to have corresponding support in the simulator itself. Testing programs written in C very often use I/O operations. This can not be done without support of C library. Hence the simulator must provide an interface for calling the functions of the operation system it runs on. In this paper we provide a method that enables programs to run, which use functions from the standard C library. After the implementation of this approach we are able to use the function provided by the C library with limitations given by the hardware.