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/*

 *  linux/arch/m68knommu/mm/fault.c

 *

 *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,

 *                      The Silver Hammer Group, Ltd.

 *

 *  Based on:

 *

 *  linux/arch/m68k/mm/fault.c

 *

 *  Copyright (C) 1995  Hamish Macdonald

 */

#include <linux/mman.h>

#include <linux/mm.h>

#include <linux/kernel.h>

#include <linux/ptrace.h>

#include <asm/system.h>

#include <asm/pgtable.h>

extern void die_if_kernel(char *, struct pt_regs *, long);

/*

 * This routine handles page faults.  It determines the problem, and

 * then passes it off to one of the appropriate routines.

 *

 * error_code:

 *      bit 0 == 0 means no page found, 1 means protection fault

 *      bit 1 == 0 means read, 1 means write

 *

 * If this routine detects a bad access, it returns 1, otherwise it

 * returns 0.

 */

asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,

                              unsigned long error_code)

{

#ifdef DEBUG

        printk("page fault!\n");

        show_regs(regs);

#endif

/*

 * Oops. The kernel tried to access some bad page. We'll have to

 * terminate things with extreme prejudice.

 */

        if ((unsigned long) address < PAGE_SIZE) {

                printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");

        } else

                printk(KERN_ALERT "Unable to handle kernel access");

        printk(" at virtual address %08lx\n",address);

        die_if_kernel("Oops", regs, error_code);

        do_exit(SIGKILL);

        return 1;

}