Computer Organization Laboratory

Develop a single cycle processor simulator for ToyRISC.

Input to the Program

    1. full path to the configuration file. A sample file is given at src/configuration/config.xml. This describes the processor to be simulated. This is not of much use in this assignment, but will be utilized in coming assignments.

    2. full path to the statistics file to be created. This file contains the statistics of the simulation run – number of instructions executed, number of cycles taken, etc.

    3. full path to the object file whose execution is to be simulated.

Output of the Program

the program must create the statistics file at the specified location.

Broad Outline of the Steps

Loading of the program: Begin with implementing the loadProgram function in the file Simulator.java.  Store the global data and instructions in the approporiate locations in the mainMemory structure (see Section “Address Space Layout” in assignment 1). Set the PC register to the memory address of the first instruction (remember from assignment 2 that

this is the first integer in the object file). Set x0= 0, x1= 216    1, and x2= 216    1. You can

check the contents of the memory using

processor.getMainMemory().getContentsAsString(<starting-address>,<ending-address>).

Simulation of the program:

– The function simulate() in the file src/generic/Simulator.java describes the overall loop that captures the simulation. The five stages of the processor are called in-order.

– There is a latch between two stages. The contents of the di erent latches are obviously di erent. Therefore, for each latch type, a separate class has been created. For example, the IF-OF latch is described by the file src/processor/pipeline/IF_OF_LatchType.java. An object of this type is created, and references to the same object are given to both the IF stage and the OF stage.

You have to decide the contents of each latch. IF_OF_LatchType has been done for you. Similarly, implement the remaining latches.


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– Implement each of the stages. The IF stage has been implemented for you. Similarly, implement the remaining stages.

– The simulation ends when an end instruction passes through the WB stage. Call setSimulationComplete() (defined in the file src/generic/Simulator.java) at this point.

– Set the statistics – number of instructions executed and the number of cycles taken – once the simulation is completed. You may do this at the end of the simulate() function. To do the setting, call the appropriate functions in the file src/generic/Statistics.java. You are encouraged to add statistics of your own in the file Statistics.java.

Tabulate cycles and instruction counts for all programs that you submitted as part of assign-ment 1, in your report. These programs will function as benchmarks for the our processor designs.

Notes

The command to run simulate the execution of an object file on the single-cycle processor that you are developing here is:
java -jar <path-to-jar-file> <path-to-config-file> <path-to-stat-file> <path-to-object-file>

All subsequent assignments in this course will involve modifying this set of source files. You will be adding many more files to this project. Please use version controlling extensively.

The usage will be similar to the previous assignments. You can use the programs written in lab1 as additional test cases if you wish.

































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