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        segment .data

a:      dd      1, 2, 3, 4, 5

        segment .bss

b:      resd    10

        segment .text

        global  main, copy_array

main:

        push    rbp

        mov     rbp, rsp

        frame   2, 0, 3

        sub     rsp, frame_size

        lea     rcx, [b]   ; destination

        lea     rdx, [a]   ; source

        mov     r8d, 5     ; count

        call    copy_array

        xor     eax, eax   ; return 0

        leave

        ret

copy_array:

        push    rbp

        mov     rbp, rsp

        frame   3, 0, 0

        sub     rsp, frame_size

        xor     r9d, r9d         ; start with 0 for index

more:   mov     eax, [rdx+4*r9]  ; load dword

        mov     [rcx+4*r9], eax  ; store qword

        add     r9d, 1           ; increment index register

        cmp     r9, r8           ; index vs count register

        jne     more             ; if not equal, more to do

        leave

        ret