本物のプログラマはlibcを使わない[要出典]のでlibcレスHelloworld

hello.s

#required x86-64 linux
#as -o hello.o hello.s
#ld -o hello -dynamic-linker (path to ld-linux...) hello.o
#./hello
.global hello
.global _start

.data
hello:
.string "Hello world!\n"
helloend:
.equ len, helloend - hello

.text
_start:
  movq $1, %rax #sys_write
  movq $1, %rdi #stdout
  movq $hello, %rsi #head of hello
  movq $len, %rdx #length helloend - hello
  syscall

  movq $60, %rax #sys_exit
  movq $0, %rdi #normal exit code
  syscall
#real programmers don't use return