global _start                                                                                              

section .bss
    mystack resb 100

section .text

_start:
    mov rax, 1
    push rax

    mov rax, 2
    push rax

    ; Stack exchange
    mov r10, rsp ; save stack pointer
    mov rsp, mystack ; load our custom stack's address into rsp.

    mov rax, 3
    push rax

    mov rax, 4
    push rax

    ; Stack exchange
    mov r11, rsp ; save stack pointer into data register r10
    mov rsp, r10 ; load our custom stack's address into rsp.

    pop rbx
    pop rbx
    pop rbx

    mov r10, rsp ; save stack pointer
    mov rsp, r11 ; load our custom stack's address into rsp.

    pop rbx
    pop rbx

    ;exits program
    mov rax, 60
    mov rdi, 0
    syscall