TCP1101: In this assignment, you will implement an assembly language interpreter that will run assembly language instructions: programming Assignment, MMU, Malaysia

Assembly Language Interpreter

Introduction:
In this assignment, you will implement an assembly language interpreter that will run assembly language instructions with accordance to a given simplified virtual machine architecture. The interpreter is expected to execute an assembly program and generate a display of the content of the virtual machine after the execution of the program.

The assembly language for the given virtual machine supports various operations such as:
1. Move operations,
2. Mathematical operations,
3. Rotation and shifting operations,
4. Basic I/O operations,
5. Loading data from memory,
6. Storing data to memory.

Virtual Machine Architecture:

The virtual machine includes 7 data general registers and a program counter where each of them is one byte wide (char), 4 flag registers (Overflow, Underflow, Carry, and Zero), and a main memory of 64 bytes.

Your virtual machine architecture will include the following components:

1. Data Registers:3
7 general-purpose data registers: R0, R1, R2, R3, R4, R5, R6. Each register is represented as a one byte (8 bits) in size. The contents of these registers are updated after executing each assembly instruction by the runner. These registers can contain signed bytes (values between -128 and 127)

2. Program Counter (PC)
The program counter starts always with the value 0, then it is incremented whenever the runner (interpreter) executes an assembly instruction.

3. Flags:

•  Overflow Flag (OF): A single bit flag (or a byte) indicating arithmetic overflow. It is set when an arithmetic operation results in a value greater than 127.
• Underflow Flag (UF): A single bit flag (or byte) indicating arithmetic underflow. Set when an arithmetic operation results in a value smaller than -128.
•  Carry Flag (CF): A single bit flag (or a byte) indicating carry in arithmetic operations. Set when an arithmetic operation results in a carry. An addition can generate a value larger then 8 bits, therefore the carry flag is set.
• Zero Flag (ZF): A single bit flag indicating the result of an operation is zero. Set when the result of an operation is zero.

4. Memory:
The memory can be represented as a one-dimensional array of 64 signed bytes. Memory addresses are numbered from 0 to 63. Memory can e accessed only by a load or store operations.

5. Assembly Language Runner (interpreter):
The interpreter reads an assembly program from a “.asm” file (text file). It must execute the instructions sequentially on the virtual machine updating the PC (program counter) after each instruction. At the end of execution, it will produce a dump of all registers and memory to the screen in addition to the output window (results of the I/O operations).

6. The assembly language instructions:
The assembly language is expected to support I/O operations, arithmetic operations, rotation, shifting, loading from memory (direct and register indirect addressing), and storing into memory

Input/Output operations:

Mov operations:

• MOV Rsrc, Rdst: copies the values stored in the source register to the destination register. The mov operation supports three modes only, these modes are explained in the following 3 examples.
  

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