【環境】
CentOS 7 x86_64
Linux 3.10.0-229.7.2.el7.x86_64
NASM 2.10.07 x86_64

【程式：hello.asm】

; 64-bit "Hello World!" in CentOS 7 x86_64

global _start           ; global entry point export for ld

_start:
    jump short string   ; get message addr

code:
    ; sys_write(stdout, message, length)
    pop     rsi         ; message address
    mov     rax, 1
 
      ; sys_write
    mov     rdi, 1      ; stdout
    mov     rdx, 13     ; message string length + 0x0a
    syscall

    ; sys_exit(return_code)
    mov     rax, 60     ; sys_exit
    mov     rdi, 0      ; return 0 (success)
    syscall

string:
    call    code
    db 'Hello world!',0x0a    ; message and
 
 newline

【編譯與執行】

[hello@local asm]$ nasm -f elf64 hello.asm -o hello.o
[hello@local asm]$ ld -s -o hello hello.o
[hello@local asm]$ ./hello

【提取】

[[email protected] asm]$ for i in $(objdump -d hello |grep "^ " |cut -f2); do echo -n '\x'$i; done; echo