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MIPS simulator

A Python simulator that executes assembly programs for the MIPS32 architecture

Quick setup

First you need to make sure you have the tk library installed on your PC. After that, you can run the python script with the following command.

cd path/to/project
python3 .

debian-based distros

sudo apt install python3-tk

Windows

pip install tk

Usage

This software reads both .asm files (that contain assembly instuctions) and .o files (with binary instructions)

The instructions that are currently supported are the following:

  • R-Type: and, or, add, sub, slt, sll
  • I-Type: andi, ori, addi, lw, sw
  • Branches: beq
  • Jumps: j
  • Others: break

Important: feel free to open a pull request to add new instructions

Limitations

You cannot use the .data assembly segment, so you can't define labels or use assembler directives in this way.

.data
name: .asciiz "marco"

.text
lw $t0, 0(name)     -> this is not supported
loop:   addi $t0, $t0, 1
        beq $t0, $t1, loop    -> this is not supported

So, if you want to access memory using lw/sw you should store the address inside a register and then work with that memory address.

lui $t0, $t0, 1000
addi $t0, $t0, 1000
addi $t1, $t1, 5
sw $t1, 0($t0)

How to contribute

Open a Pull Request and assign it to the mantainer; I'll give a look at it as soon as possible and give you a reply!

I want to add a new instruction, how can I do it?

This software is divided in two parts: the assembler, that translates the instruction into his binary representation, and the datapath, that executes the instructions. So, if you want to add a new instruction you must add it both into the assembler and into the datapath.

Please check the TODO.md file to see which instructions are currently missing and which ones need to be improved