RAX/RDI没有转到下一个系统调用?[副本]

在我正在学习的一个教程中,老师做到了

;Input codes, entry points, etc.

_showAge:
    mov rax, 1
    mov rdi, 1
    mov rsi, ageTxt
    mov rdx, 13
    syscall ;"Your age is: "

    mov rax, 1
    mov rdi, 1
    mov rsi, age
    mov rdx, 3
    syscall
    ret

_showAge:
    mov rax, 1
    mov rdi, 1
    mov rsi, ageTxt
    mov rdx, 13
    syscall ;"Your age is: "

    mov rsi, age
    mov rdx, 3
    syscall ; Doesn't do anything
    ret

这已经不起作用了,

(此脚本在Linux x86_64,Ubuntu中测试和运行)