.section .data

stack_at_first_entry:
    .quad 0

.section .text

.global menu
.extern _menu

menu:
    adrp x8, stack_at_first_entry
    ldr x9, [x8, :lo12:stack_at_first_entry]
    cbz x9, 1f
    mov sp, x9
    b 2f
1:
    mov x9, sp
    str x9, [x8, :lo12:stack_at_first_entry]
2:
    mov x30, xzr
    mov x29, xzr

    b _menu