Difference between revisions of "CSC231 Homework 2"
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==Problem #2== | ==Problem #2== | ||
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| + | For this problem you have to debug the executable version of a program and answer two questions. | ||
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| + | You can get the executable version of the program by using this command, from your Linux account: | ||
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| + | cp ~thiebaut/public_html/classes/231/hw2 . | ||
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| + | (don't forget the dot at the end of the line!) | ||
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| + | If you are working off-campus, and you have a linux machine where the utility '''wget''' is installed, try this: | ||
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| + | wget http://cs.smith.edu/~thiebaut/publich_html/classes/231/hw2 | ||
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| + | And you should get a copy of the program. | ||
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| + | Once you're done, debug the program: | ||
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| + | ddd hw2 | ||
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| + | ===Question 1=== | ||
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| + | What string of characters is contained in the string that occupies the first 31 bytes of memory? | ||
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| + | ===Question 2=== | ||
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| + | What is in the registers eax, ebx, ecx, and edx when the processor has reached the 3rd NOP instruction of the program? | ||
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Assignment #2
Problem #1
Write a program that displays the following patter using loops.
**********#
*********##
********###
*******####
******#####
*****######
****#######
***########
**#########
*##########
**#########
***########
****#######
*****######
******#####
*******####
********###
*********##
**********#
Requirements: your program cannot contain more than 5 int 0x80 instructions!
Store your program in a file called hw2a.asm and submit it as follows:
submit hw2 hw2a.asm
Problem #2
For this problem you have to debug the executable version of a program and answer two questions.
You can get the executable version of the program by using this command, from your Linux account:
cp ~thiebaut/public_html/classes/231/hw2 .
(don't forget the dot at the end of the line!)
If you are working off-campus, and you have a linux machine where the utility wget is installed, try this:
wget http://cs.smith.edu/~thiebaut/publich_html/classes/231/hw2
And you should get a copy of the program.
Once you're done, debug the program:
ddd hw2
Question 1
What string of characters is contained in the string that occupies the first 31 bytes of memory?
Question 2
What is in the registers eax, ebx, ecx, and edx when the processor has reached the 3rd NOP instruction of the program?
