CS 200 - lab #1

• Lab report
• Annotated Code

Explanation

For this lab you are required to explain and annotate compiler generated assembly code. The source code you are to use is the following simple C program:

#include < stdio.h >

main()
{
	char str[50];

	printf("enter string: ");
	scanf("%s",str);
	printf("string: %s\n",str);
}

You should assemble the C code using gcc and -O2 optimation. To generate assembly output, use the -S option.

Lab Report

Your report should include:

• A description of how you figured out the assembly code (i.e. what resources)
• An overview of what occurs during the execution of the code (be specific). This should include references to assembly code line numbers.
• Any diagrams necessary to explain your overview (e.g. stack frames etc..)

Note: To get full credit for this lab you must demonstrate that you understand every line of assembly output.

I suggest the following resources:

• Your texts
• The manual pages for: gcc and as
• The Intel documentation available from the class web page.