Description
You will continue developing your CPU in this homework. You will have now memory instructions
for your CPU. The memory addreses and constrnts should be kept different, so we represent
memory addresses with a # sign as a prefix. For example 100 is a constant but #100 is an address.
The instruction in HW1 are still valid. Your new instructions are
Move instructions
MOV reg, address
MOV address, reg
MOV address, constant
For example MOV R1, #45 copies the value of register 1 to memory location 45
Addition and Subtraction insructions
ADD reg, address
SUB reg, address
For example, ADD R1, #45 adds the value of memory location 45 to register 1
Print instructions
PRN address
For example, PRN #56 will print the value of the memory loacation 56 to the screen, after each print
a new line should be inserted.
Jump instruction
JPN reg, lineAdress
JPN R1, 32 jumps to line 32 of the program if the value of R1 is zero or smaller.
New example for clarification
SUB R1, R2 subtracts the value of register 2 from register 1 and puts the result into register 1
Modified instructions
HLT
halts the program and prints on the screen the contents of all registers as well as the the memory.
Your program will run using the same command line parameters as HW1. However, we have a new
option
The format for the command line parameters is as follows
yourProg filename option
yourProg is the name of your executable file, file name is the text file that contains your simple CPU
instructions, option a number and the defines the how your program runs as follows
• if option is 0, your program will run and finish by executing each instruction
• if option is 1, your program will execute each instruction after displaying the instruction first.
It also will print the contents of all the registers.
• If option is 2, your program will execute each instruction just like the option 1. This option
will also print the contents of the memory after each intruction execution.
Write a CPU program that sort 10 integers from smallest to largest. The integers are 30, 23, 4, 56,
34, 56, 89, 32, 45, 25. Ypu program should write these integers to the memory using MOV
instructions first. You will include your program with your submission.
Important Notes:
Your memory can hold only 50 integers. Each integer is a single unsigned byte. Addresses
start from 0.
Your program can have at most 200 instructions or lines.
Your program should hand error cases such as syntax errors in the input files. You should
print an error message on the screen and halt the program if you detect an error in the input.
With your submission, include the results of a few runs of your program with different
programs and run opitons.
Do not use any functions from the standard C library (like printf), you will use << and >>
operators to print and write strings.
Do not use any string functions like atoi or strtok or similar. If you need these functions, then
write your own!
You will use C++ string class to manuplate your strings. You may use any string member
functions.
Your program should have only functions and no classes.
Do not forget to indent your code and provide comments.
You should submit your work to the moodle page. You should strictly follow the submission
instructions which will be available shortly.
