%include "MY_IO.h"

SYS_GETRANDOM equ 318
SYS_TIME equ 201

SIZE equ 8

section .data

   label1    db  "rdtes: "
   size1     equ $ - label1
   label2    db  "getrandom: "
   size2     equ $ - label2
   label3    db  "time: "
   size3     equ $ - label3

   time_return dq 0
    
section .bss
   result resb SIZE 


section .text
   global _start

_start:

    call PRINT_NEWLINE

    ; rdtsc reads a time from the intel chip
    ; the value is returned in rax
    rdtsc
    ; save the result
    mov r15, rax

    mov rax, 1 
    mov rdi, 1 
    mov rsi, label1
    mov rdx, size1
    syscall

    mov rdi, r15 
    call PRINT_INT
    call PRINT_NEWLINE

    ; call gettimeofday
    ;   rdi is the place to store the results.
    ;   rsi is an optional time zone argument.
    mov rax, SYS_TIME
    lea rdi, time_return
    syscall

    mov rax, 1 
    mov rdi, 1 
    mov rsi, label3
    mov rdx, size3
    syscall

    mov rdi, [time_return] 
    call PRINT_INT
    call PRINT_NEWLINE

    ; system call to getrandom (see man getrandom)
    ;   rdi is the address for the results.
    ;   rsi is the size of the address
    ;   xxx are flags to control the code
    mov rax, SYS_GETRANDOM
    mov rdi, result
    mov rsi, SIZE 
    mov rdx, 0
    syscall

    mov rax, 1 
    mov rdi, 1 
    mov rsi, label2
    mov rdx, size2
    syscall

    mov rdi, [result]
    call PRINT_INT
    call PRINT_NEWLINE

    call PRINT_NEWLINE


    mov eax, SYS_EXIT
    mov edx, SUCCESS
    syscall