Question

x86-64 Windows Assembly Language. A YASM Assembly Language Program that adds 2 unsigned Integer values and produces formatted console output using the 'C' library function printf().

Answer 1

dat1 db ff

dat2 db ff

res dw ?

In the code segment

mov ax, dat1
add ax, dat2
mov dl,0
adc dl,0 ;initialize the contents of dl and use it to store the carry flag
mov byte ptr res, ax
mov byte ptr res+1, dl

printf function in assembly :

mov rdi,formatStr ; first argument: format string
mov rsi,5 ; second argument (for format string below): integer to print
mov al,0 ; magic for varargs (0==no magic, to prevent a crash!)

extern printf
call printf

ret

formatStr:
        db `The int is %d\n`,0