; NASM program to use the gettimeofday system call                                           
; for fun and profit (and extreme pnc3 goodness)
;
section .bss
    mytime  resb 16  ; struct timeval *tv
    mydelay resb 16 ; struct timeval *tv
    mytime2 resb 16  ; struct timeval *tv

;section .data

global _start

section .text
_start:
    ; gettimeofday(mytime, mytz);
    mov rax, 96 ; specify syscall #96 (gettimeofday)
    mov rdi, mytime
    mov rsi, 0
    syscall
                                                                                                 mov rbx, 0
    mov rcx, 11                                                                              

    mov rax, mydelay
    mov [rax], rcx
    inc rax
    mov [rax], rbx
    inc rax
    mov [rax], rbx
    inc rax
    mov [rax], rbx

    nop
    ; sys_nanosleep (syscall 35, struct timespec *, 0)
    mov rax, 35 ; specify syscall #96 (gettimeofday)
    mov rdi, mydelay
    mov rsi, 0
    syscall
    nop

    ; gettimeofday(mytime, mytz);
    mov rax, 96 ; specify syscall #96 (gettimeofday)
    mov rdi, mytime2
    mov rsi, 0
    syscall

    mov rbx, [mytime]
    mov rax, [mytime2]
    sub rax, rbx
    mov rcx, rax ; rcx will contain our seconds

    mov rbx, [mytime+8]
    mov rax, [mytime2+8]
    sub rax, rbx

reflect:
    nop

    ; return (0);
    mov rax, 60
    mov rdi, 0
    syscall