x86_64 Linux ASM Example

hello.S

.text
.global _start
_start:
	mov $1, %rax                    # write(1, message, 14)
	mov $1, %rdi
	mov $message, %rsi
	mov $14, %rdx
	syscall

	mov $60, %rax                   # exit(0)
	xor %rdi, %rdi
	syscall

.data
message:
	.ascii "Hello, World!\n"

Makefile

.PHONY: all
all: hello

hello: hello.o
	$(LD) hello.o -o hello

hello.o: hello.S
	$(AS) hello.S -o hello.o

.PHONY: clean
clean:
	rm -f hello hello.o