apps/invaders/start.asm

   1 ;  ZeX/OS
   2 ;  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   3 ;
   4 ;  This program is free software: you can redistribute it and/or modify
   5 ;  it under the terms of the GNU General Public License as published by
   6 ;  the Free Software Foundation, either version 3 of the License, or
   7 ;  (at your option) any later version.
   8 ;
   9 ;  This program is distributed in the hope that it will be useful,
  10 ;  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 ;  GNU General Public License for more details.
  13 ;
  14 ;  You should have received a copy of the GNU General Public License
  15 ;  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17
  18 ; This is the kernel's entry point. We could either call main here,
  19 ; or we can use this to setup the stack or other nice stuff, like
  20 ; perhaps setting up the GDT and segments. Please note that interrupts
  21 ; are disabled at this point: More on interrupts later!
  22
  23 [SECTION .text]
  24 [BITS 32]
  25
  26 extern main
  27 global entry
  28
  29 entry:
  30         ; proc vmap
  31         mov eax, 46
  32         int 0x80
  33
  34         ; first we get arguments
  35         mov eax, 26
  36         mov ecx, 0
  37         int 0x80
  38
  39         push eax        ; argv
  40
  41         ; lets get count of arguments
  42         mov eax, 26
  43         mov ecx, 1
  44         int 0x80
  45
  46         mov ebx, eax
  47         push ebx        ; argc
  48
  49         call main       ; call our program
  50
  51         pop ebx
  52         pop eax
  53
  54         ; proc exit
  55         mov eax, 1
  56         int 0x80
  57
  58         ret