#include

typedef struct Point {

int x;

int y;

} Point;

int func(Point p1, Point p2);

int main(){

Point p1, p2; p1.x = 8;

p1.y = 10;

p2.x = 2;

p2.y = 6;

printf("%d ", func(p1, p2));

return 0;

}

func:

pushl %ebp save callers frame base

movl %esp, %ebp set callees frame base

pushl %esi callee save reg (what is this actually saved?)

subl $20, %esp set callees top of stack

movl 20(%ebp), %eax eax = p2.y = 6

movl 16(%ebp), %ecx ecx = p2.x = 2

movl 12(%ebp), %edx edx = p1.y = 10

movl 8(%ebp), %esi esi = p1.x = 8

movl %esi, -16(%ebp) -16(%ebp) = esi = 8

movl %edx, -12(%ebp) -12(%ebp) = edx = 10

movl %ecx, -24(%ebp) -24(%ebp) = ecx = 2

movl %eax, -20(%ebp) -20(%ebp) = eax = 6

movl -12(%ebp), %eax eax = -12(%ebp) = 10

addl -24(%ebp), %eax eax = -24(%ebp)+%eax = 12

addl $20, %esp esp = callees top of stack

popl %esi

popl %ebp

ret

Given the assembly code for func, the output of the program is:

*bold one on the right is my interpretion, please let me know if i were wrong. I was stuck at the end, don't know what's actully being return, please explain, thanks.