Broken rip

irq_common_stub:
    pushad
    mov ax, ds
    push eax
    mov ax, 0x10 ;0x10
    mov ds, ax
    mov es, ax
    mov fs, ax
    mov gs, ax
    mov eax, dr6
    push eax
    push esp                 ; At this point ESP is a pointer to where DS (and the rest
                             ; of the interrupt handler state resides)
                             ; Push ESP as 1st parameter as it's a
                             ; pointer to a registers_t
    call irq_handler
    mov eax, [switch_task]
    cmp eax, 1
    je changeTasks
    pop ebx
    pop ebx                  ; Remove the saved ESP on the stack. Efficient to just pop it
                             ; into any register. You could have done: add esp, 4 as well
    pop ebx
    mov ds, bx
    mov es, bx
    mov fs, bx
    mov gs, bx
    popad
    add esp, 8
    sti
    iret

changeTasks:
    mov eax, 0
    mov [switch_task], eax
    call store_global ; Set a global variable with C
    add esp, 72 ; "Pop" 18 values off the stack
    jmp irq_schedule ; Switch task