CSC231 Crash Course Solution 5

--D. Thiebaut 15:10, 4 March 2011 (EST)

---

;;; prog5.asm
;;; D. Thiebaut
;;; solution for Exercise #5
;;; 
;;; Assemble, link and run as follows:
;;;   nasm -f elf asm_io.asm        (do this only once)
;;;   nasm -f elf prog3.asm
;;;   gcc -o prog5 driver.c prog5.o asm_io.o
;;;   ./prog5
;;; 
%include "asm_io.inc"
        
%assign SYS_EXIT        1

        ;; -------------------------
        ;; data segment
        ;; -------------------------
        section .data
a       dd      3
b       dd      5
c       dd      8
d       dd      10
e       dd      20        
result  dd      0

        ;; -------------------------
        ;; code area
        ;; -------------------------
        section .text
        global  asm_main
asm_main:
        mov     eax, 0                ; start with 0 in eax
        mov     ecx, 5                ; get ready to loop 5 times
        mov     esi, a                ; make esi point to a

for:    add     eax, [esi]            ; add whatever esi points to to eax
        add     esi, 4                ; make esi point to next integer in mem
        loop    for                   ; loop back if haven't looped 5 times yet...
        
        mov     [result],eax          ; store sum in result
        call    print_int             ; and print value

        call    print_nl              ; call the function that prints
                                      ; a new blank line

        ;; return to C program

        ret