1                                 %line 1+1 screenmsg.asm
     2                                 
     3                                 [section .data]
     4                                 LF equ 10
     5                                 NULL equ 0
     6                                 TRUE equ 1
     7                                 FALSE equ 0
     8                                 EXIT_SUCCESS equ 0
     9                                 STDIN equ 0
    10                                 STDOUT equ 1
    11                                 STDERR equ 2
    12                                 SYS_read equ 0
    13                                 SYS_write equ 1
    14                                 SYS_open equ 2
    15                                 SYS_close equ 3
    16                                 SYS_fork equ 57
    17                                 SYS_exit equ 60
    18                                 SYS_creat equ 85
    19                                 SYS_time equ 201
    20                                 
    21 00000000 0A0A4D455353414745-    message1 db LF, LF, "MESSAGE 1",LF, LF, NULL
    22 00000000 20310A0A00         
    23 0000000E 4D4553534147452032-    message2 db "MESSAGE 2", LF, NULL
    24 0000000E 0A00               
    25 00000019 0A0A00                 newline db LF, LF, NULL
    26                                 
    27                                 [section .text]
    28                                 [global _start]
    29                                 _start:
    30                                 
    31 00000000 48C7C7[00000000]       mov rdi, message1
    32 00000007 E823000000             call printmsg
    33                                 
    34 0000000C 48C7C7[00000000]       mov rdi, message2
    35 00000013 E817000000             call printmsg
    36                                 
    37 00000018 48C7C7[00000000]       mov rdi, newline
    38 0000001F E80B000000             call printmsg
    39                                 
    40 00000024 48C7C03C000000         mov rax, SYS_exit
    41 0000002B 48C7C700000000         mov rdi, EXIT_SUCCESS
    42 00000032 0F05                   syscall
    43                                 
    44                                 [global printmsg]
    45                                 printmsg:
    46                                 
    47 00000034 53                     push rbx
    48 00000035 4889FB                 mov rbx, rdi
    49 00000038 4889FE                 mov rsi, rdi
    50                                 
    51 0000003B 48C7C200000000         mov rdx, 0
    52                                 
    53                                 stringcountloop:
    54 00000042 803B00                 cmp byte[rbx], NULL
    55 00000045 7406                   je stringcountdone
    56 00000047 48FFC2                 inc rdx
    57 0000004A 48FFC3                 inc rbx
    58 0000004D EBF1                   jmp stringcountloop
    59                                 
    60                                 stringcountdone:
    61 0000004F 4883FA00               cmp rdx, 0
    62 00000053 740E                   je _done
    63                                 
    64 00000055 48C7C001000000         mov rax, SYS_write
    65                                 
    66                                 
    67 0000005C 48C7C701000000         mov rdi, STDOUT
    68                                 
    69 00000063 0F05                   syscall
    70                                 
    71                                 _done:
    72 00000065 5B                     pop rbx
    73 00000066 C3                     ret
    74