Mips simulator for computer systems class

• Read File
• Save in Memory
• Goes to Infinite loop (Fetch Execute)
• Reads the instruction and finds out what to do

# int
instruction = memArray[pc >> 2] # shifts by 2 or divide by 4 

#int 
op = (instruction >> 26) & 0x3F # Takes the high order 6 bits

#int
sRegister = (instruction >> 21) & 0x1F

if instruction & SLL_MASK == SLL_OP # Another way of checking which instruction should be executed.

switch(op):
    ins = Instruction()
    op == ADD:
        ins = Add()
    ...
    
ins.execute()

get char from string = num % 16^2

imm = inst & 0xFFFF
se_imm = (imm & 0x8000 != 0) ? ( imm | 0xFFFF0000) : imm 
   

Everywhere that there is a 0 or 1 we set the value to 1. If there is a variable we set the value to a 0

Ex:

Add Mask: 0000 00ss ssst tttt dddd d000 0010 0000 1111 1100 0000 0000 0000 0111 1111 1111

Write a routine that gets a String and converts it to hex

• Read input
• Store in Memory and Registers
• Start infinite loop
  • Read PC location in memory
  • Call Evaluate with the value stored in memory
    • Mask 1 -> Mask 2 -> Mask 3 -> Function Call
    • Function:
      • Calls get s, t, d, or h word
      • Evaluate the function with those arguments.