.intel_syntax noprefix
    .global write
    .global read
    .global open
    .global close
    .global fork
    .global real_waitid
    .global execve
    .global pause
    .global mknod
    .global dup2
    .global chdir
    .global mount
    .global exit

    write:
        mov rax, 1
        syscall
        ret

    read:
        mov rax, 0    # syscall number for read
        mov rdi, rdi  # file descriptor (already in rdi)
        mov rsi, rsi  # buffer pointer (already in rsi)
        mov rdx, rdx  # size (already in rdx)
        syscall
        ret
    
    open:
        mov rax, 2
        syscall
        ret
    
    close:
        mov rax, 3
        syscall
        ret

    fork:
        mov rax, 57
        syscall
        ret

    real_waitid:
        mov rax, 247
        mov r10, rcx
        syscall
        ret

    execve:
        mov rax, 59
        syscall

    pause:
        mov rax, 34
        syscall

    mknod:
        mov rax, 133
        syscall
    
    dup2:
        mov rax, 33
        syscall
    
    chdir:
        mov rax, 80
        syscall
    
    mount:
        mov rax, 165
        mov r10, rcx
        syscall

    exit:
        mov rax, 60
        syscall
        ret