global main  ; expose the main function to the linker
section .text ; declare this part of the assembly code to belong to the "text" section, i.e. code section

main:  ; define a symbolic label, whose address is remembered by the assembler for later
	mov rax, 1  ; SYS_write system call
	mov rdi, 1  ; stdout
	mov rsi, hello ; pointer to start of bytes to write
	mov rdx, 14 ; length of byte string to print
	syscall  ; instruction to trap into the OS

	mov rax, 60  ; SYS_exit system call
	mov rdi, 0 ; 0 exit code - signals success
	syscall ; trap into OS
	; (no return, process exits on the call above)
	
section .rodata ; declare this part of the assembly to belong to the "read-only data" section; on Linux, it is illegal/impossible to write to this area.
hello:
	db "Hello, world!", 10  ; output raw bytes corresponding to the string into the binary; this can be addressed using the "hello" label