support.c

Jazmyn is a 32-bit, protected mode, multitasking OS which runs on i386 & above CPU`s. Its complete

/*
 * Copyright (C) 2004, Thejesh AP. All rights reserved.
 */

#include <jazmyn\support.h>
#include <jazmyn\const.h>

void _main()
{
        //_CTOR_LIST__ is defined in the linker script
        extern void (*_CTOR_LIST__)();

        //constructor is a list of pointers to constructors of global objects
        void (**constructor)() = &_CTOR_LIST__;
        int total = *(int*)constructor; //total number of global constructors
        constructor++;  //increment to first constructor
        while(total)
        {
                void (*ptr)() = *constructor;
                ptr();
                total--;
                constructor++;
        }
}

void _atexit()
{
        //_DTOR_LIST__ is defined in the linker script
        extern void(*_DTOR_LIST__)();

        //destructor is a list of pointers to destructors of global objects
        void (**destructor)() = &_DTOR_LIST__;
        int total = *(int*)destructor;  //first dword contains number of destructors
        destructor++;
        while(total)
        {
                void (*ptr)() = *destructor;
                ptr();
                (*destructor)();
                total--;
                destructor++;
        }
}