Tutorial Moodle VPL Assembly Language with Output

--D. Thiebaut (talk) 08:25, 12 June 2014 (EDT)

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This tutorial builds on the first one in the series, which should be done first, as the present tutorial skips some steps. In this tutorial I present a simple VPL activity to test an assembly language program that displays a fixed string of characters.

VPL Activity

Assembly Language: print stars
Due date: Monday, 20 June 2016, 8:00 PM
Requested files: hw2.asm (Download)
Type of work: Individual work
Grade settings: Maximum grade: 100
Run: Yes Evaluate: Yes
Assembly Language program that displays stars

Execution files

vpl_run.sh

#! /bin/bash
 
cat > vpl_execution <<EOF
#! /bin/bash
nasm -f elf -F stabs hw2.asm
ld -melf_i386 -o hw2 hw2.o
./hw2
EOF

chmod +x vpl_execution

vpl_evaluate.cases

case = Test 1
output = "*********************
*********************
*********************
*********************
*********************
*********************
"

Testing

• In the VPL Administration box, click on Test activity, Edit, and enter the solution program below in the edit box:

                        section .data
        stars           db      "*********************", 10
                        db      "*********************", 10
                        db      "*********************", 10
                        db      "*********************", 10
                        db      "*********************", 10
                        db      "*********************", 10

                                section .text
                                global _start
_start:

;;; print stars
                                mov     eax, 4
                                mov     ebx, 1
                                mov     ecx, stars
                                mov     edx, 132
                                int     0x80

;;; ; exit

                                mov     ebx, 0
                                mov     eax, 1
                                int     0x80

• Click on Run and verify that you get an array of stars in the terminal window.

• Click on Evaluate and verify that you get 100/100.

This concludes this tutorial.