; 
; Copyright 2010 Stefan Lankes, Chair for Operating Systems,
;                               RWTH Aachen University
;
; Licensed under the Apache License, Version 2.0 (the "License");
; you may not use this file except in compliance with the License.
; You may obtain a copy of the License at
;
;     http://www.apache.org/licenses/LICENSE-2.0
;
; Unless required by applicable law or agreed to in writing, software
; distributed under the License is distributed on an "AS IS" BASIS,
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
; See the License for the specific language governing permissions and
; limitations under the License.
;
; This file is part of metalsvm.

[BITS 32]
SECTION .data
   cmdline DB "cmdline", 0
   argv DD 0, 0

SECTION .text
global _start
extern main
extern __do_global_dtors
extern __do_global_ctors
extern hardware_init_hook
extern software_init_hook
extern atexit
extern exit
_start:
   ; call init hooks, if any exists
   lea eax, [hardware_init_hook]
   cmp eax, 0
   je	L1
   call eax
L1:
   lea eax, [software_init_hook]
   cmp eax, 0
   je L2
   call eax
L2:
   ; register a function to be called at normal process termination
   push __do_global_dtors
   call atexit
   pop eax

   ; call init function
   call __do_global_ctors

   ; build argc/argv pair and then push
   ; them onto the stack...
   mov [argv+0], DWORD cmdline
   mov eax, [esp+4]
   mov [argv+4], eax
   push argv
   push 2

   ; call the user's function
   call main

   ; remove argc/argv pair
   add esp, 8

   ; call exit from the C library so atexit gets called, and the
   ; C++ destructors get run. This calls our exit routine below    
   ; when it's done.
   ; call "exit"
   push eax
   call exit

   ; endless loop
   jmp $