RV06

extern printf
extern scanf

global main

                SECTION .data
welcome:        db "RV06: ASM_div", 0x0A, 0x00
prompt:         db "Please enter a number: ", 0x00
output:         db "%d", 0x0A, 0x00
information:    db "Using n/2: %d", 0x0A, 0x00
debug_output:   db "Value: %d", 0x0A, 0x00
input_format:   db "%ld", 0x00

                SECTION .bss
user_input:     resq 1
current_number: resq 1

                SECTION .text
main:           mov     rbp, rsp
                push    rbp

show_welcome:   mov     rdi, welcome            ; Show a little welcome message/title
                xor     eax, eax                ; Using xor with itself to set whole register to 0
                call    printf

enter_number:   mov     rdi, prompt             ; Prompt the user for a number
                xor     rax, rax
                call    printf

                mov     rdi, input_format       ; Read the number into user_input
                mov     rsi, user_input
                xor     rax, rax
                call    scanf

divide_by_two:  xor     rdx, rdx                ; Clear RDX (Used in divisor)
                mov     rax, [user_input]       ; Get the value of user_input into rax
                mov     rcx, 2                  ; Get the divisor into rcx
                div     rcx                     ; Divide rax by rcx
                mov     [user_input], eax       ; Set the value of user_input to the result (stored in rax)

                mov     rdi, information
                mov     rsi, [user_input]
                xor     rax, rax
                call    printf

loop_init:      mov     rax, 1
                mov     [current_number], rax   ; Start at 1, load through RAX

loop_start:     xor     rdx, rdx                ; Clear RDX (before division)
                mov     rax, [current_number]
                mov     rcx, 47
                div     rcx                     ; Divide current number by 47, remainder will be in RDX

                cmp     rdx, 0                  ; Is the remainder 0 (evenly divisible by 47)
                jne     skip_output

                mov     rdi, output             ; Print the current number
                mov     rsi, [current_number]
                xor     rax, rax
                call    printf

skip_output:    mov     rax, [current_number]   ; Compare the current_number
                cmp     rax, [user_input]       ; to the maximum value defined by the user
                jge     exit                    ; Exit if greater than or equal

                mov     rcx, [current_number]   ; Increment
                inc     rcx
                mov     [current_number], rcx

                jmp     loop_start

exit:           mov     rax, 60                 ; syscall exit
                xor     rdi, rdi                ; exit(0), everything is okay
                syscall