Difference between revisions of "CSC231 Homework Solutions 2017"
(Created page with "--~~~~ ---- =Problem 1= ::<source lang="asm"> ;;; mystery.asm ;;; D. Thiebaut ;;; ;;; To assemble, link, and run: ;;; nasm -f elf mystery.asm ;;; ...") |
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mov edx, 3 ; print only 3 chars | mov edx, 3 ; print only 3 chars | ||
int 0x80 | int 0x80 | ||
| + | |||
| + | ;;; exit | ||
| + | mov ebx, 0 | ||
| + | mov eax, 1 | ||
| + | int 0x80 | ||
| + | |||
| + | </source> | ||
| + | <br /> | ||
| + | =hw1.asm= | ||
| + | <br /> | ||
| + | ::<source lang="asm"> | ||
| + | ;;; hw1.asm | ||
| + | ;;; D. Thiebaut | ||
| + | ;;; | ||
| + | ;;; To assemble, link, and run: | ||
| + | ;;; nasm -f elf hw1.asm | ||
| + | ;;; ld -melf_i386 -o hw1 hw1.o | ||
| + | ;;; ./hw1 | ||
| + | ;;; | ||
| + | |||
| + | section .data | ||
| + | msg db " CSC231 Assembly " | ||
| + | linefeed db 10 | ||
| + | dashline db "------------------" | ||
| + | lineLen equ $-dashline | ||
| + | |||
| + | section .text | ||
| + | global _start | ||
| + | _start: | ||
| + | |||
| + | ;;; print message | ||
| + | mov eax, 4 ; write | ||
| + | mov ebx, 1 ; stdout | ||
| + | mov ecx, dashline ; address of message to print | ||
| + | mov edx, lineLen ; # of chars to print | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ; write | ||
| + | mov ebx, 1 ; stdout | ||
| + | mov ecx, dashline ; address of message to print | ||
| + | mov edx, lineLen ; # of chars to print | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ;print line-feed | ||
| + | mov ebx, 1 | ||
| + | mov ecx, linefeed | ||
| + | mov edx, 1 | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ; write ---- | ||
| + | mov ebx, 1 ; stdout | ||
| + | mov ecx, dashline ; address of message to print | ||
| + | mov edx, 9 ; # of chars to print | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ; write message | ||
| + | mov ebx, 1 ; stdout | ||
| + | mov ecx, msg ; address of message to print | ||
| + | mov edx, lineLen ; # of chars to print | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ; write ---- | ||
| + | mov ebx, 1 ; stdout | ||
| + | mov ecx, dashline ; address of message to print | ||
| + | mov edx, 9 ; # of chars to print | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ;print line-feed | ||
| + | mov ebx, 1 | ||
| + | mov ecx, linefeed | ||
| + | mov edx, 1 | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ; write | ||
| + | mov ebx, 1 ; stdout | ||
| + | mov ecx, dashline ; address of message to print | ||
| + | mov edx, lineLen ; # of chars to print | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ; write | ||
| + | mov ebx, 1 ; stdout | ||
| + | mov ecx, dashline ; address of message to print | ||
| + | mov edx, lineLen ; # of chars to print | ||
| + | int 0x80 | ||
| + | |||
| + | mov eax, 4 ;print line-feed | ||
| + | mov ebx, 1 | ||
| + | mov ecx, linefeed | ||
| + | mov edx, 1 | ||
| + | int 0x80 | ||
;;; exit | ;;; exit | ||
Revision as of 16:58, 22 April 2017
--D. Thiebaut (talk) 17:57, 22 April 2017 (EDT)
Problem 1
;;; mystery.asm ;;; D. Thiebaut ;;; ;;; To assemble, link, and run: ;;; nasm -f elf mystery.asm ;;; ld -melf_i386 -o mystery mystery.o ;;; ./mystery ;;; section .data Hello db "Hello there!", 10, 10 HelloLen equ $-Hello section .text global _start _start: ;;; print Hello and a space after it mov eax, 4 ; write mov ebx, 1 ; stdout mov ecx, Hello ; address of message to print mov edx, 6 ; print only 6 chars int 0x80 ;;; print ! and two line feed chars mov eax, 4 ; write mov ebx, 1 ; stdout mov ecx, Hello+11 ; address of ! char mov edx, 3 ; print only 3 chars int 0x80 ;;; exit mov ebx, 0 mov eax, 1 int 0x80
hw1.asm
;;; hw1.asm ;;; D. Thiebaut ;;; ;;; To assemble, link, and run: ;;; nasm -f elf hw1.asm ;;; ld -melf_i386 -o hw1 hw1.o ;;; ./hw1 ;;; section .data msg db " CSC231 Assembly " linefeed db 10 dashline db "------------------" lineLen equ $-dashline section .text global _start _start: ;;; print message mov eax, 4 ; write mov ebx, 1 ; stdout mov ecx, dashline ; address of message to print mov edx, lineLen ; # of chars to print int 0x80 mov eax, 4 ; write mov ebx, 1 ; stdout mov ecx, dashline ; address of message to print mov edx, lineLen ; # of chars to print int 0x80 mov eax, 4 ;print line-feed mov ebx, 1 mov ecx, linefeed mov edx, 1 int 0x80 mov eax, 4 ; write ---- mov ebx, 1 ; stdout mov ecx, dashline ; address of message to print mov edx, 9 ; # of chars to print int 0x80 mov eax, 4 ; write message mov ebx, 1 ; stdout mov ecx, msg ; address of message to print mov edx, lineLen ; # of chars to print int 0x80 mov eax, 4 ; write ---- mov ebx, 1 ; stdout mov ecx, dashline ; address of message to print mov edx, 9 ; # of chars to print int 0x80 mov eax, 4 ;print line-feed mov ebx, 1 mov ecx, linefeed mov edx, 1 int 0x80 mov eax, 4 ; write mov ebx, 1 ; stdout mov ecx, dashline ; address of message to print mov edx, lineLen ; # of chars to print int 0x80 mov eax, 4 ; write mov ebx, 1 ; stdout mov ecx, dashline ; address of message to print mov edx, lineLen ; # of chars to print int 0x80 mov eax, 4 ;print line-feed mov ebx, 1 mov ecx, linefeed mov edx, 1 int 0x80 ;;; exit mov ebx, 0 mov eax, 1 int 0x80
