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  1. section .data
  2.     msg db "Value of rbx (lower byte): 0x", 0
  3.     newline db 10
  4.  
  5. section .bss
  6.     hex_digit resb 2
  7.  
  8. section .text
  9.     global _start
  10.  
  11. _start:
  12.     ; Инициализация регистров
  13.     mov rax, 0x1111111111111111
  14.     mov rbx, 0x2222222222222222
  15.  
  16.     ; Сохранение в стеке
  17.     push rax
  18.     push rbx
  19.  
  20.     ; Извлечение из стека
  21.     pop rbx
  22.     pop rax
  23.  
  24.  
  25.     ; Extract lower byte of rbx
  26.     mov al, bl
  27.     and al, 0x0F
  28.  
  29.     cmp al, 0x0A
  30.     jl is_digit
  31.     add al, 0x37
  32.     jmp save_digit
  33.  
  34. is_digit:
  35.     add al, 0x30
  36.  
  37. save_digit:
  38.     mov [hex_digit], al
  39.     mov byte [hex_digit+1], 0
  40.  
  41.     ; Вывод строки
  42.     mov rax, 1
  43.     mov rdi, 1
  44.     mov rsi, msg
  45.     mov rdx, 30
  46.     syscall
  47.  
  48.     ; Вывод значения
  49.     mov rax, 1
  50.     mov rdi, 1
  51.     mov rsi, hex_digit
  52.     mov rdx, 1
  53.     syscall
  54.     ; Вывод новой строки
  55.     mov rax, 1
  56.     mov rdi, 1
  57.     mov rsi, newline
  58.     mov rdx, 1
  59.     syscall
  60.  
  61.     ; Выход
  62.     mov rax, 60
  63.     xor rdi, rdi
  64.     syscall
  65.  
Success #stdin #stdout 0s 5284KB
comments (?)
stdin
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Standard input is empty
stdout
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Value of rbx (lower byte): 0x2
https://ideone.com/d5MGYn
language:
Assembler 64bit (nasm 2.14)
created:
3 days ago
visibility:
public

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