Pipeline Simulator

a RISC pipeline simulator of NASM file including :

• real RISC processor emulator
• semantic and structural hazards
• memory cost
• graphical visualization using tkinter

Warning : The goal of this simulator is to understand the pipeline through the execution of ONE function on random data. So there is not a real stack and call instruction.

Requirement

• Linux or Windows
• python >= 3.5 or pypy >= 3.5
• tkinter >= 3.5

Launch

python3 main.py asm_file.py

where asm_file is a valid NASM program which respects the rules shown below.

NASM language

• Supported instructions :

mov	sub	add	mul	jmp	jne	je	jl	js	cmp	jcmp	call

• All lines beginning by a dot '.' is ignored except labels and the header '.string'
• The character '#' is used to comment, it can be put everywhere.
• The only function supported with call is printf. You can pass up to 15 arguments with the following order convention (from left to right) :

di	si	dx	cx	r8	r9	r10	r11	r12	r13	r14	r15

• static strings must be put in a .string linked to a label (see examples/printf.s) :

   .LC0:
       .string "Linus"

RISC Pipeline

Pipeline used is a RISC 5-µInstructions pipeline :

• Fetch:
• Decode:
• Execute:
• Memory:
• Write Back:

Example :

With the program :

   mov ax, 42
   add ax, 1
   mov bx, ax

We obtain the pipeline below :

cycle n°	1	2	3	4	5	6	7	8	9
mov ax, val	F	D	E	M	W
add ax, 1		F	?	D	E	M	W
mov bx, ax			F	?	?	D	E	M	W