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CMSC 313 Projects
Project 1
Project 2
Project 3
Project 4
Project 5
Submitting your Project
The project is to be submitted on linux.gl.umbc.edu as
submit cs313 proj1 convert.asm
submit cs313 proj2 math_64.asm
submit cs313 proj3 plotc.asm
submit cs313 proj4 proj4.vhdl or
submit cs313 proj4 proj4.v
submit cs313 proj5 proj5.vhdl or
submit cs313 proj5 proj5.v
To see what is submitted
submitls cs313 proj1
To delete a file that was submitted
submitrm cs313 proj1 convert.asm
Getting Started
Using UMBC computer
From anywhere you can reach the internet:
ssh your-username@linux.gl.umbc.edu # or use putty, etc.
your-password
mkdir cs313 # or whatever directory name you want, only once
cd cs313 # every time you log in for CMSC 313
# Get some sample files. (some not needed until later)
cp /afs/umbc.edu/users/s/q/squire/pub/download/hello.asm .
cp /afs/umbc.edu/users/s/q/squire/pub/download/intarith_64.asm .
cp /afs/umbc.edu/users/s/q/squire/pub/download/xor.circ .
# be sure to type the final space dot
# you can type in the command lines or get these Makefile's
cp /afs/umbc.edu/users/s/q/squire/pub/download/Makefile_nasm .
# test compile hello.asm
nasm -f elf64 hello.asm # or just make -f Makefile_nasm
gcc -m64 -o hello hello.o
./hello > hello.out
cat hello.out
ls -ltr # see files you have
Or type
make -f Makefile_nasm
ls -ltr
If this did not work, see Help Desk, T.A. or instructor
Write and submit a NASM assembly language program
"convert.asm" that implements the number conversions
that you did for Homework 1. The file "intarith_64.asm"
might be helpful.
You start with two constants in the .data section
dec1: db '1','2','6','.','3','7','5',0
bin1: dq 01010110110111B ; 10101101.10111 note where binary point should be
You convert dec1 to a string of characters that is
the binary representation of 126.3750 with a binary point
and three bits to the right of the binary point.
Print your characters (string) with printf or a kernel call.
You convert bin1 to a string of characters that is
the decimal representation of 10101101.10111.
Print your characters (string) with printf or a kernel call.
You may use any method of your choice, and you may print results
as four numbers: '1','2','6' as 1's and 0's, binary.
'.','3','7','5' as '.' 1's and 0's binary.
010101101 as a decimal number, integer
.10111 as a decimal number, .dddd decimal fraction.
submit your file, when it is working correctly,
submit cs313 proj1 convert.asm
Your file must assemble with no errors and execute
with the commands:
nasm -f elf64 convert.asm
gcc -m64 -o convert convert.o
./convert # ./ needed if '.' not first in PATH
Then submit cs313 proj1 convert.asm
Note: '1' is an ASCII character. Subtract 48 from an ASCII
character to get a binary number. Add 48 to a binary
number in the range 0 to 9 to get the ASCII character
'0' to '9'.
'1','2','6' is 1*100 + 2*20 + 6 = 126, binary in a register.
See horner_64.asm for sample loops.
and loopint_64.asm another sample.
You do not have to use loops, you can solve just specific problem.
It is OK to process and print one character or digit at a time.
A snippet of sample code for printing in Nasm:
dec1: db '1','2','6','.','3','7','5', 0
fmt_char: db "%c",0 ; no '\n' thus no 10
fmt_dig: db "%1ld",0 ; print just one digit, e.g. 0 or 1
fmt_end: db 10, 0 ; just end line
mov rdi,fmt_char ; print a single character
mov al, [dec1] ; byte into bottom of rax
mov rsi, rax ; must go 64-bit to 64-bit
mov rax, 0 ; no float
call printf
mov rdi,fmt_dig ; print a single character as digit
mov rax, 0 ; be safe, zero all rax
mov al, [dec1+1] ; next byte into bottom of rax
sub rax, 48 ; change character digit to number
; imul rax, 10 ; '2' is 20 need to add up 1*100+2*10+4
mov rsi, rax ; must go 64-bit to 64-bit
mov rax, 0 ; no float
call printf
mov rdi,fmt_end ; print end of line
mov rax, 0 ; no float
call printf
Note: and rax,1 ; print with %1ld, prints bottom bit as 0 or 1
; shr rax to get the bit you want
Hint, C code, for converting .375 to .011
frac_bin.c
frac_bin.out
Beware rounding when storing double as integer.
May need fld, fld, compp as in ifflt_64.asm
Partial credit: 25% for decimal integer to binary
25% for decimal fraction to binary
25% for binary integer to decimal
25% for binary fraction to decimal
Zero points if your convert.asm does not compile,
if your convert.asm just prints the answers without
doing the conversion.
if two or more convert.asm are copied
Write and submit NASM assembly language functions
that implement the given "C" functions in math_64.c
The main program test_math_64.c
that does not know how the functions are implemented.
The test program is test_math_64.c
The .h file with function prototypes is math_64.h
Your correct output should be test_math_64.chk
Note: There is zero credit when math_64.asm does not compile without errors.
Your file must assemble with no errors and execute on linux.gl.umbc.edu
with the commands:
nasm -g -f elf64 math_64.asm
gcc -g3 -m64 -o test_math_64 test_math_64.c math_64.o
./test_math_64 > test_math_64.out
cat test_math_64.out
Then submit cs313 proj2 math_64.asm
For debugging due to segfault:
gdb test_math_64
break main
run
step
step keep stepping until segfault, thus see where you have a bug
nexti use in place of step to step one instruction at a time
Your project is to convert math_64.c to math_64.asm
You may use pre_math_64.asm
renamed to math_64.asm as a start. Compile and run to be sure
compilation and execution are working, then add project code.
All referenced files may be copied to your directory using:
Replace xxx.x with the file you want.
cp /afs/umbc.edu/users/s/q/squire/pub/download/xxx.x .
You are to write a program that does not use "C" functions or libraries.
This project is based on lecture 8.
You may use system calls or BIOS calls from Lecture 9 to implement the program.
See hellos_64.asm for compiling, _start
To compile and run your program, use:
nasm -f elf64 plotc_64.asm
ld -o plotc_64 plotc_64.o
./plotc_64
You only need to print one character at a time, rdx, 1 in syscall.
Print 10, '\n' at end of each line.
Or, add one column filled with 10, and print lines=rows.
Your program is to make a simple character plot of cos(x)
for x from -Pi to Pi, -3.14159 to 3.14159 in 41 steps, dx = 0.15708
Use 21 rows, middle row for cos(0.0) = 1.0,
top row for cos(Pi/2) = 0.0, bottom row for cos(-Pi)=cos(Pi) = -1.0
For each column plotting an '*' at row k = int(20.0 - (y+1)*10.0)
A very small version of the plot would look like:
* 9 columns, 7 rows
* *
* *
* *
* *
Compute cos(x) in your program y = cos(x) =
1 - x^2/2! + x^4/4! - x6^/6! + x^8/8!
OK to use code from horner_64.asm float
af: dq 1.0, 0.0, -0.5, 0.0, 0.41667, 0.0, -0.001389, 0.0. 0.000025
N: dq 8
XF: x=0, x=x+dx dx = 0.15708
This computes YF = cos(XF)
mov rcx,[N] ; loop iteration count initialization, n
fld qword [af+8*rcx]; accumulate value here, get coefficient a_n
h5loop: fmul qword [XF] ; * XF
fadd qword [af+8*rcx-8] ; + aa_n-i
loop h5loop ; decrement rcx, jump on non zero
fstp qword [Y] ; store Y
Then compute kf = 20.0 - (Y+1.0)*10.0 floating point
Then store k as integer: fistp qword [k]
Then compute double subscript, integer, k*ncol+j in rax
Then store star:
mov bl, [star]
mov [a2+rax], bl
Note: For printing mov rsi, rax // syscall (rcx for int)
add rsi, a2 // not [a2+rax] need address
If it runs to your satisfaction,
Then submit cs313 proj3 plotc.asm
The program in "C" is
See plotc_64.c for possible method
See plotc_64.outc "C" output
See plotc_chk.out Nasm output
See hornerc_64.asm for computing cos(x)
// plotc_64.c simple plot of cos(x)
#include <stdio.h>>
#define ncol 41
#define nrow 21
int main(int argc, char *srgv[])
{
char points[nrow][ncol]; // char == byte
char point = '*';
char space = ' ';
long int i, j, k;
double af[] = {1.0, 0.0, -0.5, 0.0,
0.041667, 0.0, -0.001389, 0.0, 0.000025};
long int n = 8;
double x, y;
double dx = 0.15708; // 6.2832/40.0
// clear points to space ' '
for(i=0; i=0; i--) y = y*x + af[i];
k = 20 - (y+1.0)*10.0; // scale 1.0 to -1.0, 0 to 20
printf("x=%f, y=%f, k=%d \n", x, y, k);
fflush(stdout);
points[k][j] = point;
x = x + dx;
}
// print points
for(i=0; iNasm code for loops to clear and print array of characters
array2_64.asm sample code
array2_64.out output
snippet of code, double loop, to clear array
(ultra conservative, keeping i and j in memory)
These 3 lines of "C" code become many lines of assembly
// clear points to space ' '
for(i=0; i<nrow; i++)
for(j=0; j<ncol; j++)
points[i][j] = space;
section .bss ; ncol=7, nrow=5 for demo
a2: resb 21*41 ; two dimensional array of bytes
i: resq 1 ; row subscript
j: resq 1 ; col subscript
k: resq 1 ; row subscript computed
SECTION .text ; Code section. just snippet
; clear a2 to space
mov rax,0 ; i=0 for(i=0;
mov [i],rax
loopi:
mov rax,[i] ; reload i, rax may be used
mov rbx,0 ; j=0 for(j=0;
mov [j],rbx
loopj:
mov rax,[i] ; reload i, rax may be used
mov rbx,[j] ; reload j, rbx may be used
imul rax,[ncol] ; i*ncol
add rax, rbx ; i*ncol + j
mov dl, [spc] ; need just character, byte
mov [a2+rax],dl ; store space
mov rbx,[j]
inc rbx ; j++
mov [j],rbx
cmp rbx,[ncol] ; j<ncol
jne loopj
mov rax,[i]
inc rax ; i++
mov [i],rax
cmp rax,[nrow] ; i<ncol
jne loopi
; end clear a2 to space
; j = 0;
; xf = X0;
From horner_64.asm use
cos: mov rcx,[N] ; loop iteration count initialization, n
fld qword [af+8*rcx]; accumulate value here, get coefficient a_n
h5loop: fmul qword [XF] ; * XF
fadd qword [af+8*rcx-8] ; + aa_n-i
loop h5loop ; decrement rcx, jump on non zero
fstp qword [Y] ; store Y
; k = 20.0 *(Y+1.0)*(-10.0) fistp qword [k]
; rax gets k * ncol + j
; put "*" in dl, then dl into [a2+rax]
; XF = XF + DX0;
; j = j+1;
; if(j != ncol) go to cos
; copy clear a2 to space
; in jloop renamed, use syscall print from hellos_64.asm
; add rax,a2 replaces dl stuff
; mov rsi, rax (moved up) replaces mov rsi, msg
; replace any len with 1
; after jloop insert line feed lf: db 10
; mov rsi, lf in lpace of mov rsi, rax
; use exit code from hellos_64.asm
; no push or pop rbx
in .data
af: dq 1.0, 0.0, -0.5 ; coefficients of polynomial, a_0 first
dq 0.0, 0.041667, 0.0, -0.001389, 0.0, 0.000025
XF: dq 0.0 ; computed
Y: dq 0.0 ; computed
N: dq 8 ; power of polynomial
X0: dq -3.14159 ; start XF
DX0: dq 0.15708 ; increment for XF ncol-1 times
one: dq 1.0
nten: dq -10.0
twenty dq 20.0
Your plotc.asm can not use printf or any "C" functions.
Thus you use global _start and _start: in place of
global main and main:
; compile using nasm -g -f elf64 plot.asm
; ld -o plotc_64 plotc_64.o # not gcc
; ./plotc_64 > plotc_64.out
; cat plotc_64.out
Use VHDL or Verilog:
For Vhdl:
Use proj4.vhdl as the start of
project 4. Everything has been provided to build and test a
4-bit times 4-bit unsigned parallel multiply. In order to have
less VHDL, a "madd4" entity was created. The multiplier can now
be built from exactly four of the "madd4" entities.
(Slightly different from multiplier used in the lecture.)
The first "madd4" is in the file. You must code the three
remaining "madd4" and code the "dot" merge of "cout" with
the top three bits of the "sum", and the product bits "p".
Notes: Each box is a madd4 entity.
The boxes should be labeled a0:, a1:, a2: and a3:.
The cout signals are named c(0), c(1), c(2) and c(3).
The sum signals are named s0, s1, s2, p(6 downto 3).
The dot where three wires join the cout wire is
coded in VHDL as s0s <= c(0) & s0(3 downto 1);
The s0s 4-bit signal goes into the madd4 'b' input.
The first 'b' input must be four zero bits, signal zero4.
The low order product bit, p(0) is the bottom bit
of s0 and is coded in VHDL as p(0) <= s0(0);
For Verilog:
Use proj4.v as the start of
project 4.
This is a modification of mul4.v
Fill in module madd4 using four madd modules.
Then instantiate four madd4 to build the circuit.
Your output should have correct 1 or 0 in place of "z"
proj4_v.out
proj4_v.chk
Other sample Verilog files
add4.v
mul4.v
First: You must have an account on a GL machine. Every student
and faculty should have this.
Either log in directly to linux.gl.umbc.edu or
Use ssh linux.gl.umbc.edu
Be in your cs313 directory, else files must be changed.
You can copy many sample files to your working directory using:
cp /afs/umbc.edu/users/s/q/squire/pub/download/cs313.tar .
There are many files available.
Next: Follow instructions exactly or you figure out a variation.
1) Get this tar file into your home directory (on /afs i.e.
available on all GL machines.)
cs313.tar and then type commands:
cp /afs/umbc.edu/users/s/q/squire/pub/download/cs313.tar .
tar -xvf cs313.tar
cd vhdl
fix cds.lib to have correct path
source vhdl_cshrc
make
more add32_test.out
make clean # saves a lot of disk quota
If verilog does not run, use command:
source /afs/umbc.edu/software/cadence/etc/setup_2008/cshrc.cadence
Then do your own thing with Makefile for other VHDL files
You are on your own to write VHDL or Verilog and modify the Makefile.
Remember each time you log on:
cd vhdl
source vhdl_cshrc
make # or do your own thing.
Now work project 4:
Run the following commands:
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj4.vhdl .
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj4.run .
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj4.chk .
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj4.make .
You should get some results from the command
make -f proj4.make
or verilog -q -l proj4_v.out proj4.v
Lots of "U" until you insert the VHDL for the project.
Now, work the project.
You do the submit, submit cs313 proj4 proj4.vhdl or
submit cs313 proj4 proj4.v
check your products by hand or computer
Finish up the design and finish up the implementation
of a six bit spin lock.
You are given a starter VHDL file proj5.vhdl
Or, use the given starter Verilog file proj5.v
The spin lock is given by
Use names A, B, C, D, E, F for the spin lock, there
is debug print in proj5.vhdl and proj5.v for testing.
Initialize all D flip flops to '0' except set A to '1'.
Be sure to compute "activate" along with the Ain, Bin, etc.
The test input has the name "rcvr" and has 10 entries.
The code to be detected is 6 bits in the middle.
The entity dff1 in VHDL, module dff6 in verilog, is used by
the spin lock is ready to use in
proj5.vhdl. The circuit symbol is:
The module dff6 that is used by the spin lock is ready to use in
proj5.v. similar circuit symbol.
Your project is to finish the VHDL or verilog code for the spin lock.
Look for "???"
See lecture notes Lect 23
for method of converting a sequential circuit to digital logic.
The lecture notes have legal VHDL statements, e.g Ain <= ... ;
The Verilog uses Ain = ...;
Code the digital logic in VHDL and add the VHDL statements
into proj5.vhdl
Copy files into your vhdl directory with the following commands:
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj5.vhdl .
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj5.run .
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj5_vhdl.out .
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj5.make .
You should get some results from the command
make -f proj5.make
proj5_vhdl.chk .
Lots of "U" until you insert the VHDL for the project.
For Verilog
Copy files into your vhdl directory with the following commands:
cp /afs/umbc.edu/users/s/q/squire/pub/download/proj5.v .
Run with verilog -q -l proj5_v.out proj5.v
output before adding project proj5_v.out .
Now work project 5.
Then submit cs313 proj5 proj5.vhdl or
submit cs313 proj5 proj5.v
proj5_v.chk .
Files to download and other links
Course links
Last updated 7/26/2015