CISC2001 Lab Project Assignment
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CISC2001 Lab Project Assignment
Nov, 2023
1 Reminder
• Deadline: Before the final exam
2 Assembly Programming Project
2.1 Task Description
Design, code and test/debug an Aarch64 assembly program that performs the following:
1. Read in a line of character which contains from 1 to 100 bytes;
2. The characters/bytes represent UTF-8 encoding of Unicode Character;
3. Count the number of Unicode characters in the input stream;
4. The result of the count should return as the exit code of the program with the following code:
1 
. . .
2 
// Read in the string with syscall to read ( fd , ∗ buffer , len )
3 
mov x0 , #0 // fd for stdin
4 
ldr x1 , =buffer // load the address of buffer to x1
5 
mov x2 , #200 // number of character to be read
6 
mov w8, #63 // syscall# for read
7 
svc #0 // invoke the syscall
8 
9 
// after the call , the number of byte read in should stored in x0 10 
// and the input bytes are store in buffer
11 
// This is the part that you should work on your magic 12 
13 
// i . e . , count the number of Unicode character in the buffer
14 
// After that , assumed that the result was found and stored in x1 15 
mov x0 , x1 //save the result as exit code in x0
16 
mov w8, #93 // service # for exit
17 
svc #0
Note: Since UTF-8 is a variable-length encoding scheme, the number of Unicode characters will not be the same as the number of bytes in the input string.
2.2 Testing
. To test your program, you can
1. download the test-tools.zip file in the attachment files;
2. copy the file to your emulator in the same directory as your source file, using the scp command; (path-1 means the path of test-tools.zip under emulator (windows/macOS))
1 
scp −P 8022 path−1 ubuntu@localhost :/home/ubuntu/
3. run the following
1 
unzip test−tools . zip
2 
chmod +x tester . sh
3 
./ tester . sh yourprogram
Where yourprogram is the name of your assembly program. For the first two instructions, you only need to run them once. After that, each time you modify your source code, you only need to run the last instruction to test your updated program.
. If the unzip program is not available in your system, you need to first install it with:
1 
sudo apt install unzip
. Note:
– The test-tools.zip is now the final version. It has all the 9 seen test cases. When grading your assignment, an additional unseen test case will be added to the test system.
– For some of the test data, you can see the actual content if you open them in a text editor. Just keep in mind that there is an invisible ”\n” at the end of each data file. So, the number of characters in the data should be one more than what you see inside the file.
2.3 Requirements
. The project should be completed by at most two students in a group;
. Write the complete information about your group members at the beginning of your source as remarks:
1 
// Group Members :
2 
// 1. A−B0 − 1357 −9 Chan Tai Man
3 
// 2. A−B0 −2468 −0 Lie Kai Ian
. Submissions that fail to achieve any one of the following will receive 0 marks:
– The submission must be made on or before the deadline;
– The submission must be the source code file of the assembled language program; (i.e.: filename.s)
– The program must be free of syntax error and must be able to be assembled and linked successfully by the test system;
– The program must pass at least one of the test cases in the test system;
. Marking
– Please fully document your code;
– Your final mark is directly proportional to the number of test cases that your program can pass;
2.4 Files to be submitted
. Source code file (i.e.: filename.s);
. Project report (including screenshots of experimental results.).
2023-12-29