CSC231-Assembly · D. Thiebaut, Computer Science, Smith College Outline • Review + Lab 1: uP...

mith College

Computer Science

Dominique Thiébaut dthiebaut@smith.edu

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

Processor +

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

Mini Lab

• Link to the simulator

• Link to the documentation

• Link to the simulator lab

• Lab3: Assembly

• Object files

• Ascii Table

Demo: Emacs (Do lab on your own)

• ssh to aurora ssh -Y cs231a-xx@aurora.smith.edu

• Emacs demo

• Basic commands

emacs -nw helloWorld.asm

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

cursor keys

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

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!

CSC231-Assembly · D. Thiebaut, Computer Science, Smith College Outline • Review + Lab 1: uP...

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