%macro scall 4 ;macro with 4 parameters
    mov rax, %1
    mov rdi, %2
    mov rsi, %3
    mov rdx, %4
    syscall
%endmacro

section .data
    m1 db 10d,"The Vendor ID string is: "
    l1 equ $-m1

    m2 db 10d,"Register contents: "
    l2 equ $-m2

    newline db 10

section .bss
    string resw 16
    value resb 32
    temp resd 1
    temp1 resb 2

section .text
    global _start
    _start:
        scall 1,1,m1,l1
        mov eax,0h
        cpuid
        mov edi,string
        mov [edi],ebx
        mov [edi + 4],edx
        mov [edi + 8],ecx
        scall 1,1,string,12
        scall 1,1,newline,1
        scall 1,1,m2,l2 
        mov eax,01h
        cpuid
        mov [temp], eax
        call hex2ascii
        scall 1,1,value, 32
        scall 1,1,newline,1
        exit:
            scall 60,0,0,0

hex2ascii:
    mov esi, value
    mov cl, 32
    jmp1:
    mov eax, [temp]
    rol eax, 1
    mov [temp], eax
    and eax, 01h
    add al, 30h
    mov [esi], al
    inc esi
    dec cl
    jnz jmp1
ret