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  1. section .bss
  2.  msg resb 1 ; reserva 1 byte para um caractere
  3.  
  4. section .data
  5.  
  6. section .text
  7.  global _start
  8.  
  9. _start:
  10. ; Lê 1 caractere do teclado
  11.  mov eax, 3 ; sys_read
  12.  mov ebx, 0 ; stdin
  13.  mov ecx, msg ; onde armazenar
  14.  mov edx, 5 ; quantos bytes
  15.  int 0x80 ; chamada de sistema
  16.  jmp trocar
  17.  
  18. trocar:
  19.  mov al, [msg]
  20.  or al, 32
  21.  mov [msg], al
  22.  jmp imprime_caractere
  23.  
  24.  imprime_caractere:
  25.  mov eax, 4 ; sys_write
  26.  mov ebx, 1 ; stdout
  27.  mov ecx, msg ; endereço da string
  28.  mov edx, 5 ; tamanho da string (8 chars + newline)
  29.  int 0x80 ; chamada de sistema
  30.  jmp exit
  31.  
  32. exit:
  33.  mov eax, 1 ; sys_exit
  34.  mov ebx, 0
  35.  int 0x80
Success #stdin #stdout 0s 5320KB
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stdin
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stdout
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https://ideone.com/Pulqla
language:
Assembler 32bit (nasm 2.14)
created:
6 hours ago
visibility:
public

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