Please find the code in x86 64-bit assembly below

The program writes to stdout (calling write) then exits.

```
section .data
    msg db "Hello world!",10      ; message to print, with newline character. 10 is the ASCII code for a new line (LF)

section .text
    global _start

_start:
    mov rax, 1          ; move the value 1 to rax register ( system call number for "write")
    mov rdi, 1          ; move the value 1 to rdi register ( file descriptor for stdout)
    mov rsi, msg        ; move the address of the "msg" variable (contains the message to print) into the rsi register
    mov rdx, 13         ; move the value 13 into the rdx register ( length of the message)
    syscall             ; make a system call to print the message to the console

    mov rax, 60         ; move the value 60 to rax register (system call number for "exit")
    mov rdi, 0          ; move the value 0 to rdi register ( exit code for the program)
    syscall             ; make a system call (using the arguments of the registers) to exit the program
```
The message "Hello World!" is stored in the .data section of the program and is accessed using the "msg" variable.

In the .text section, the _start label marks the start of the program. The first block of code moves the needed values into the registers needed to make a system call to print the message using the write function. It then  moves the appropriate values into the registers needed to make a system call to exit the program using the exit function.

This code uses syntax of nasm (Netwide Assembler). If you want to execute this program use the following commands (assuming the code is in the file HelloWorld.asm). They are needed for assembling, linking and executing, respectively.

```
nasm -f elf64 -o HelloWorld.o HelloWorld.asm
ld -o HelloWorld HelloWorld.o
./HelloWorld

```
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