section .data
    shellcmd db `/bin/sh`,0
    argv0 dq 0   
    argv1 dq 0   

section .text
global main:

extern mysyscall
main:
    mov rdi, shellcmd ; we will need this for the first paramter and to 
                      ; manipulate argv[0]

    mov [argv0], rdi  ; put the address of the command in argv[0]

    mov rsi, argv0
    mov rdx, 0

    mov rax, 59
    syscall