In this assignment, you will extend the functionality of your RISC-V disassembler to also simulate the execution of a binary file.

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In this assignment, you will extend the functionality of your RISC-V disassembler to also simulate the execution of a binary file.

This is the third of a multi-part assignment creating computing machine capable of executing real programs compiled with gcc. The purpose is to gain an understanding of a machine and its instruction set.

 

1 Problem Description

 

Execute a binary file by loading it into a simulated memory of sufficient size and then decode and execute each 32-bit instruction one-at-a-time starting from address zero and continuing until an an ebreak instruction is encountered, an instruction-count limit is reached, or an illegal instruction has been encountered.

 

 

2 Files You Must Write

 

You will write a C++ program suitable for execution on hopper.cs.niu.edu (or turing.cs.niu.edu.)

Your source files MUST be named exactly as shown below or they will fail to compile and you will receive zero points for this assignment.

Create a directory named a5 and place within it a copy of all the the source files from assignment 4 and add the additional files discussed below.

 

• hex.h (see assignment 4.)

• hex.cpp (see assignment 4.)

• memory.h (see assignment 4.)

• memory.cpp (see assignment 4.)

• rv32i_decode.h (see assignment 4.)

• rv32i_decode.cpp (see assignment 4.)

• rv32i_hart.cpp The definition of the class rv32i_hart.

• rv32i_hart.h The definitions of member functions of class rv32i_hart.

• registerfile.h The definition of the registerfile class will go here.

• registerfile.cpp The registerfile class member function definitions.

• cpu_single_hart.h The definition of the class cpu_single_hart.

• cpu_single_hart.cpp The cpu_single_hart class member function definitions.

• main.cpp Your main() and usage() function definitions.

 

Provided that no mistakes are present in the files for Assignment 4 then no changes to those files are neces- sary.

 

 

2.1 registerfile.h  and  registerfile.cpp

The purpose of this class is to store the state of the general-purpose registers of one RISC-V hart.1

Recall that a RISC-V hart has 32 registers and that every one is identical except for register x0.

Register x0 will always contain the value zero when ever it is read and it will never store anything that is written into it (such data is simply ignored/discarded.)

Implement registerfile with a private vector of int32_t elements (one for each register) and a constructor that uses the reset() method to initialize register x0 to zero, and all other registers to 0xf0f0f0f0.

It must provide the following member functions:

 

• void reset();

Initialize register x0 to zero, and all other registers to 0xf0f0f0f0.

• void set(uint32_t r, int32_t val);

Assign register r the given val. If r is zero then do nothing.

• int32_t get(uint32_t r) const;

Return the value of register r. If r is zero then return zero.

• void dump(const  std::string  &hdr)  const;

Implement a dump of the registers.  The hdr parameter is a string that must be printed at the begining of the output lines. For example, if called as dump("") then the output must be formatted precisely as:

 

x0 00000000 f0f0f0f0 f0f0f0f0 f0f0f0f0   f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0   f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0

 

if called as dump("HEADER-") then the output must be formatted precisely as:

 

HEADER- x0 00000000 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 HEADER- x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 HEADER-x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 HEADER-x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0

 

Note the space-gap on the first two lines.

Inherit the hex class and use its hex32() utility function to simplify printing the register values!

 

 

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