Argv printer in 64 bit assembly (System-V)

argv.s

.intel_syntax noprefix

.text

.globl strlen; strlen:
  xor rcx, rcx
  mov rsi, rdi
  jmp 0f
  1:
    inc rcx
  0:
    lodsb
    test al, al
    jne 1b
  mov rax, rcx
  ret

.globl puts; puts:
  call strlen
  mov rdx, rax
  mov rsi, rdi
  mov rax, 1
  mov rdi, 1
  syscall
  mov rax, 1
  mov rsi, offset newline
  mov rdx, 1
  syscall
  ret

.globl _start; _start:
  mov rdi, rsp
  mov ecx, [rdi]
  jmp 0f
  1:
    add rdi, 8
    push rdi
    push rcx
    mov rdi, [rdi]
    call puts
    pop rcx
    pop rdi
    dec ecx
  0:
    test ecx, ecx
    jne 1b
  mov rax, 60
  xor rdi, rdi
  syscall

.section .rodata
newline: .byte '\n'