CSC231-Assembly · D. Thiebaut, Computer Science, Smith College Outline • Review + Lab 1: uP simulator Lab • Lab2: Emacs (do on your own) • Lab3: Assembly • Assembly + Linking

mith College

Computer Science

Dominique Thiébaut [email protected]

CSC231-AssemblyWeek #2 Fall 2018

D. Thiebaut, Computer Science, Smith College

Outline• Review + Lab 1: uP simulator Lab

• Lab2: Emacs (do on your own)

• Lab3: Assembly

• Assembly + Linking Process

• Object files

• DB directive: Everything is a byte!

• HexDump: we need to learn hexadecimal!

• Ascii Table


Review


Review

Processor +

ACPC

3

Add 1

HaltStore [9]

Load [9]

11 10 9 8 7 6 5 4 3 2 1 0


Similarity w/ Hand Calculator


Computer Simulator Review

http://www.science.smith.edu/dftwiki/media/simulator/

http://bit.ly/2jTJswI



http://bit.ly/2jTJswI


Mini Lab

• Link to the simulator

• Link to the documentation

• Link to the simulator lab


http://www.science.smith.edu/dftwiki/index.php/Simple_Computer_Simulator_Instruction-Set

http://www.science.smith.edu/dftwiki/index.php/CSC231_Micro-Processor_Simulator_Lab





• Lab3: Assembly


• Object files



• Ascii Table


Emacs


Demo: Emacs (Do lab on your own)

• ssh to aurora ssh -Y [email protected]

• Emacs demo

• Basic commands

emacs -nw helloWorld.asm

^X^C^G^D^K^Y

cursor keys


Shell


Shell


3 Useful Linux Commands

• ls (ell ess) list all files in a folder/directory

• cp copy file

• cd change directory


Linux Commandscommand -switches file-name(s)


Linux Commands

ls -1 ls *.asm ls *.o ls hello* ls -l

man ls

command -switches file-name(s)


We stopped here last time…


GoogleYouTubePython


Solution ProgramsFor Simulator Lab

; Solution for Problem 1 LOAD 22 ; load 22 into the accumulator STORE [10] ; STORE [11] ; STORE [12] ; HALT ;

; Solution for Problem 2 LOAD 9 ; load 22 into the accumulator STORE [20] ; LOAD 19 ; STORE [21] ; LOAD 13 ; STORE [22] ; HALT ;

; Solution for Problem 30000: LOAD [10] ;0002: STORE [11] ;0004: STORE [12] ;0006: STORE [13] ;0008: HALT ;0010: 55 ;

Typical

Midterm

Question!


Solution ProgramsFor Simulator Lab

; Problem 4; Part 1LOAD [8] ;ADD 2 ;STORE [8] ;HALT ;8: 55 ;

; Part 20000: LOAD [20] ;0002: ADD 2 ;0004: STORE [20] ;0006: LOAD [21] ;0008: ADD 2 ;0010: STORE [21] ;0012: HALT ;0020: 55 ;0021: 13 ;

; Solution for Problem 50000: LOAD [10] ;0002: ADD 5 ;0004: STORE [10] ;0006: JUMP 0 ;0010: 55 ;

; Solution for Challenge

0000: LOAD [10] ;0002: ADD [10] ;0004: ADD [11] ;0006: STORE [12] ;0008: HALT ;0009: HALT ;0010: 3 ;0011: 5 ;0012: 0 ;




• Lab3: Assembly


• Object files



• Ascii Table


LAB TIME!

• Demo

• Do the lab in pair

• Printing strings and understanding db

http://www.science.smith.edu/dftwiki/index.php/CSC231_Hello_World_Lab_2018




Skeleton


Hello World!


Assembly+Linking

xxx.asm xxx.o xxx

nasm ld


Assembly+Linking

xxx.asm yyy.asm

xxx.o yyy.o

xxx

nasm ld


DB: byte storage


Data Section vs Memorymessage db "hello",10


Data Section vs Memorymessage db "hello" db 10


Data Section vs Memory

message db "h","e","l","l","o" db 10


Data Section vs Memory

message db "hel" db "lo" db 10


Data Section vs Memorymessage db 104,"el" db "lo" db 10


Exercise section .data

msg1 db "lo " db "hel"

msg3 db "world!", 10msgLen equ$-msg3

_start:mov eax, 4 mov ebx, 1 mov ecx, msg1+3 mov edx, 3int 0x80

mov eax, 4 mov ebx, 1 mov ecx, msg1 mov edx, 3 int 0x80

mov eax, 4 mov ebx, 1 mov ecx, msg3mov edx, msgLen ; # of charsint 0x80


We stopped here last time…


Element of Style

Don't!


Element of Style

Better!

Documents

CSC231-Assembly · D. Thiebaut, Computer Science, Smith College Outline • Review + Lab 1: uP simulator Lab • Lab2: Emacs (do on your own) • Lab3: Assembly • Assembly + Linking