SIMP-Assembler-Simulator

Description

This repository contains a university course project. The project involves developing an assembler and a simulator for the SIMP processor, a RISC-based processor similar to MIPS but with simplified functionality. The repository also includes assembly programs designed for testing the functionality of the assembler and simulator.

SIMP Processor Description

The SIMP processor has the following features:

• 16 Registers: Includes general-purpose registers, special-purpose registers (e.g., $zero, $imm1, $imm2), and control registers.
• Instruction Set: Supports arithmetic, logical, branch, memory, and I/O operations. Each instruction is 48 bits wide.
• Memory:
  • Instruction memory: 4096 lines (48 bits each).
  • Data memory: 4096 lines (32 bits each).
• I/O Devices:
  • LEDs
  • 7-segment display
  • 256x256 monochromatic monitor
  • Disk drive (64 KB capacity with 128 sectors)
• Interrupts: Supports three interrupts (irq0, irq1, irq2) with specific hardware behavior.

Usage

The project needs to run on Windows.

Assembler

The assembler converts assembly programs into machine code for the SIMP processor. It takes an assembly source file as input:

asm.exe <program.asm> <imemin.txt> <dmemin.txt>

Simulator

The simulator simulates the SIMP processor’s fetch-decode-execute cycle along with I/O device interactions. It reads input files, simulates the execution of the program, and generates output files detailing the state of the processor and memory.

Input Files

• imemin.txt: Instruction memory contents.
• dmemin.txt: Data memory contents.
• diskin.txt: Disk contents.
• irq2in.txt: External interrupt timings.

sim.exe <imemin.txt> <dmemin.txt> <diskin.txt> <irq2in.txt> <dmemout.txt> <regout.txt> <trace.txt> <hwregtrace.txt> <cycles.txt> <leds.txt> <display7seg.txt> <diskout.txt> <monitor.txt> <monitor.yuv>

Output Files

Assembler

The assembler generates two output files:

• imemin.txt: Initial contents of the instruction memory.
• dmemin.txt: Initial contents of the data memory.

Simulator

The simulator generates output files detailing the state of the processor and memory:

• dmemout.txt: Final data memory state.
• regout.txt: Register values.
• trace.txt: Execution trace of instructions.
• hwregtrace.txt: Hardware register access trace.
• cycles.txt: Total clock cycles used.
• leds.txt: LED status changes.
• display7seg.txt: 7-segment display status.
• diskout.txt: Final disk state.
• monitor.txt: Final monitor pixel values.
• monitor.yuv: Binary monitor pixel data.

Testers

The repository includes four assembly test programs:

1. tests/mulmat/mulmat.asm: Multiplies two 4x4 matrices.
2. tests/binom/binom.asm: Calculates the Newton binomial coefficient recursively.
3. test/circle/circle.asm: Draws a circle on a 256x256 monochrome screen.
4. test/disktest/disktest.asm: Shifts the first 8 sectors of a disk drive forward by one sector.

Each test program is provided with its corresponding input and output files for verification.