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  1. section .data
  2.     my_var dq 0x123456789ABCDEF0  
  3.     msg db "Value of my_var (lower byte): 0x", 0
  4.     newline db 10
  5.  
  6. section .bss
  7.     hex_digit resb 2
  8.  
  9. section .text
  10.     global _start
  11.  
  12. _start:
  13.  
  14.     mov rax, [my_var]
  15.  
  16.  
  17.     add rax, 0x10
  18.  
  19.  
  20.     mov [my_var], rax
  21.  
  22.  
  23.     mov al, byte [my_var]   
  24.     and al, 0x0F          
  25.  
  26.     cmp al, 0x0A
  27.     jl is_digit
  28.     add al, 0x37   
  29.     jmp save_digit
  30.  
  31. is_digit:
  32.     add al, 0x30   
  33.  
  34. save_digit:
  35.     mov [hex_digit], al
  36.     mov byte [hex_digit+1], 0
  37.  
  38.  
  39.     mov rax, 1
  40.     mov rdi, 1
  41.     mov rsi, msg
  42.     mov rdx, 33
  43.     syscall
  44.  
  45.  
  46.     mov rax, 1
  47.     mov rdi, 1
  48.     mov rsi, hex_digit
  49.     mov rdx, 1
  50.     syscall
  51.  
  52.  
  53.     mov rax, 1
  54.     mov rdi, 1
  55.     mov rsi, newline
  56.     mov rdx, 1
  57.     syscall
  58.  
  59.  
  60.     mov rax, 60
  61.     xor rdi, rdi
  62.     syscall
  63.  
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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Value of my_var (lower byte): 0x0
https://ideone.com/5uXqs2
language:
Assembler 64bit (nasm 2.14)
created:
1 day ago
visibility:
public

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