.global _start

_start:

//push %ebx // do we need to persist them???
//push %ecx

//cmp $0,_impure_ptr
//jne skipzero

//movl $0xf5000000, _impure_ptr
//mov  $0xf5000000,%ebx

//allzero: 
//movl $0, (%ebx)
//add $4, %ebx
//cmp $0xf5001000,%ebx
//jne allzero

//skipzero:

// move impure pointer to our special page (check if not htere already!)

mov _impure_ptr,%eax
mov $0xf5000000,%ebx

copy: 
mov (%eax),%ecx
mov %ecx,(%ebx)
add $4, %ebx
add $4, %eax
cmp $0xf5001000,%ebx
jne copy

movl $0xf5000000, _impure_ptr

call _init // constructors 

// constructors from array_init
mov $__init_array_start,%eax

nextctor: 

//cmp (__init_array_end),%eax
cmp $__init_array_end,%eax
je finctor

push %eax
call *(%eax)
pop %eax

add $4, %eax
jmp nextctor

finctor:

//pop %ecx
//pop %ebx

# environment adress was passed on stack

pop %eax                      
mov %eax, environ

pop %ecx
pop %ebx

and $-16,%esp
sub $8,%esp

push %ebx
push %ecx

# call main (argc and argv are on the stack)
call main

// ALIGN stack
and $-16,%esp
sub $4,%esp

push %eax

call _fini //desctructors

// pop programmm return value
pop %eax

// ALIGN stack
and $-16,%esp
sub $4,%esp

# push exit code and pass to _exit syscall
push %eax
call exit

# and this should never be reached!!
.wait:
    hlt
jmp .wait