[BITS 32]

global isrs

global catchall_return

catchall: ; At this point the gate number has been pushed to the stack
  pushad
  mov eax, cr3
  push eax
  push 0

  ; Pushed 40 bytes
  mov eax, [esp+40]
  mov ebx, gates
  mov eax, [ebx+4*eax]

  ; Check if we came from Ring 3
  movzx ecx, word [esp+56]
  and ecx, 3
  cmp ecx, 3
  jne no_copy

  mov ecx, 72
  mov esi, esp
  mov edi, [_ZN6Global13currentThreadE]
  rep movsb
  mov ecx, [_ZN6Global13currentThreadE]
  push ecx
  jmp call
no_copy:
  push esp
  jmp call
call:
  ; Increment the current thread's count
  mov ecx, [_ZN6Global13currentThreadE]
  mov edx, [ecx]
  add edx, 1
  mov [ecx], edx

  call eax

catchall_return:
  add esp, 4
  push 0x20
  push 0x20
  call outb
  add esp, 8

  ; Decrement and check the current thread's count

  mov ecx, [_ZN6Global13currentThreadE]
  mov edx, [ecx]
  sub edx, 1
  mov [ecx], edx
  cmp edx, 0
  jne skip_copying

  sub esp, 72
  mov ecx, 72
  mov esi, [_ZN6Global13currentThreadE]
  mov edi, esp
  rep movsb

skip_copying:
  add esp, 4
  pop eax
  mov cr3, eax

  popad
  add esp, 8
  pop ebp
  iret

extern gates ; (void(*)(frame_struct))*
extern outb
extern _ZN6Global13currentThreadE