Addition of two hex numbers NASM Programming

 Addition.asm

%macro print 2
mov rax,1
mov rdi,1
mov rsi,%1
mov rdx,%2
syscall
%endmacro
%macro read 2
mov rax,0
mov rdi,0
mov rsi,%1
mov rdx,%2
syscall
%endmacro

SECTION .data
msg1: db"Enter how many numbers you want to add??",0xA
len1: equ $-msg1

msg2: db"Enter the number::",0xA
len2: equ $-msg2

msg3: db"Addition of the numbers::"
len3: equ $-msg3

SECTION .bss
number: resb 20
count: resb 1
result : resb 20
reserveh : resb 2
reservel : resb 2

SECTION .text
global main:
main:

print msg1,len1
read number,20

call convert_Number

mov [count],bl
loop6:
        print msg2,len2
        read number,20
        call convert_Number
        add [reservel],bl
        adc byte[reserveh],0
        dec byte[count]
jnz loop6

mov bl,[reservel]
mov bh,[reserveh]
mov [result],bx
call convert_Result
print msg3,len3
print result,20




mov rax,60
mov rdi,0
syscall




convert_Number:
        mov esi,number
        mov bl,00
        mov ecx,2
        loop1:
            rol bl,04
            mov al,[esi]
            cmp al,39h
            jbe loop2
            sub al,07h
        loop2:
            sub al,30h
            add bl,al
            inc esi
            loop loop1
RET

convert_Result:
        mov esi,result
        mov ecx,4
        loop3:
            rol bx,04
            mov al,bl
            and al,0Fh
            cmp al,09h
            jbe loop4
            add al,07h
        loop4:
            add al,30h
            mov [esi],al
            inc esi
            loop loop3
RET