Description
Create an ARMv8 assembly language program that implements the following program:
#define FALSE 0
#define TRUE 1
struct point {
int x, y;
};
struct dimension {
int width, height;
};
struct box {
struct point origin;
struct dimension size;
int area;
};
struct box newBox()
{
struct box b;
b.origin.x = 0;
b.origin.y = 0;
b.size.width = 1;
b.size.height = 1;
b.area = b.size.width * b.size.height;
return b;
}
void move(struct box *b, int deltaX, int deltaY)
{
b->origin.x += deltaX;
b->origin.y += deltaY;
}
void expand(struct box *b, int factor)
{
b->size.width *= factor;
b->size.height *= factor;
b->area = b->size.width * b->size.height;
}
void printBox(char *name, struct box *b)
{
printf(“Box %s origin = (%d, %d) width = %d height = %d area = %d\n”,
name, b->origin.x, b->origin.y, b->size.width, b->size.height,
b->area);
}
int equal(struct box *b1, struct box *b2)
{
int result = FALSE;
if (b1->origin.x == b2->origin.x) {
if (b1->origin.y == b2->origin.y) {
if (b1->size.width == b2->size.width) {
if (b1->size.height == b2->size.height) {
result = TRUE;
}
}
}
}
return result;
}
int main()
{
struct box first, second;
first = newBox();
second = newBox();
printf(“Initial box values:\n”);
printBox(“first”, &first);
printBox(“second”, &second);
if (equal(&first, &second)) {
move(&first, -5, 7);
expand(&second, 3);
}
printf(“\nChanged box values:\n”);
printBox(“first”, &first);
printBox(“second”, &second);
}
Implement all the subroutines above as unoptimized closed subroutines, using stack variables to store all
local variables. Note that the function newBox () must have a local variable (called b) which is returned by
value to main(), where it is assigned to the local variables first and second. In other words, create code
similar to what the C compiler produces, even if it seems inefficient. Name the program assign4.asm.
Also run the program in gdb, displaying the values of first and second after they have been set by function
calls.
You should show that the functions are working as expected. Capture the gdb session using the script
UNIX command, and name the output file script.txt.
Other Requirements
Make sure your code is readable and fully documented, including identifying information at the top of each
file.
You must comment each line of assembly code. Your code should also be well designed: make sure it
is well organized, clear, and concise.
New Skills Needed for this Assignment:
Implementation of structs and nested structs
Implementation of subroutines in assembly
Returning structs by value from functions
Use of pointers as arguments to subroutines
Submit the following:
1. Your assembly source code file for the program, and your script output file. Use the Assignment 4
Dropbox Folder in D2L to submit electronically. The TA will assemble and run your program to test it.
Be sure to name your program and script file as described above.
Computing Machinery I
Assignment 4 Grading
Student:__________________________________________
Functionality
newBox() function 8 ______
move() function 4 ______
expand() function 6 ______
equal() function 6 ______
printBox() function 6 ______
main() function 8 ______
Correct implementation of structs 4 ______
Correct use of stack variables 4 ______
Script showing gdb session 2 ______
Complete documentation and commenting 4 ______
Design quality 2 ______
Total 54 ______ _____%