format ELF64

section '.text' executable

extrn 'putchar' as __putchar
putchar = PLT __putchar

public main

main:
    ; allocate space for locals (a and b: 4 bytes each → 8 bytes total)
    push rbp
    mov rbp, rsp
    sub rsp, 8

    ; local a = 34  → stored at [rbp - 4]
    mov dword [rbp - 4], 34

    ; local b = 35  → stored at [rbp - 8]
    mov dword [rbp - 8], 35

    ; compute a + b
    mov eax, [rbp - 4]
    add eax, [rbp - 8]

    ; call putchar(a + b)
    ; SysV: first integer arg → EDI
    mov edi, eax
    call putchar

    ; return 0 from main
    mov eax, 0

    leave
    ret