section .data
msg db 'Valor de rcx: ', 0
section .bss
num resb 2 ; Reservando 2 bytes para armazenar o valor convertido (para valores de 0 a 9)
section .text
global _start
_start:
mov rax, 5 ; Move o valor 5 para o registrador rax
mov rbx, 3 ; Move o valor 3 para o registrador rbx
cmp rax, rbx ; Compara rax com rbx
jz iguais ; Se rax for igual a rbx, salta para "iguais"
mov rcx, 9 ; Se não forem iguais, move o valor 9 para rcx
jmp fim ; Salta para o rótulo "fim"
iguais:
mov rcx, 0 ; Se forem iguais, move 0 para rcx
fim:
; Imprimir a mensagem
mov rax, 1 ; Número da chamada do sistema para escrever
mov rdi, 1 ; Identificador de saída padrão (stdout)
mov rsi, msg ; Endereço da mensagem
mov rdx, 14 ; Tamanho da mensagem
syscall ; Chama o sistema para escrever
; Verificar se rcx está dentro do intervalo 0-9
; Se rcx for maior que 9, não imprimiremos caracteres errados
cmp rcx, 9
jae fim2 ; Se rcx > 9, vai para fim2
; Converte rcx para um caractere ASCII (0-9)
add rcx, '0' ; Converte o número para o caractere ASCII correspondente
mov [num], rcx ; Armazena o caractere convertido no buffer 'num'
; Imprimir o valor de rcx como caractere
mov rax, 1 ; Número da chamada do sistema para escrever
mov rdi, 1 ; Identificador de saída padrão (stdout)
mov rsi, num ; Endereço do valor convertido em 'num'
mov rdx, 1 ; Comprimento de 1 byte
syscall ; Chama o sistema para escrever
jmp fim2 ; Salta para o fim
fim2:
; Finaliza o programa
mov rax, 60 ; Número da chamada do sistema para sair
xor rdi, rdi ; Código de saída 0
syscall ; Chama o sistema para sair
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