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/*
* arch/ubicom32/mm/fault.c
* Ubicom32 architecture page fault implementation.
*
* (C) Copyright 2009, Ubicom, Inc.
* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
* Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
*
* Based on:
*
* linux/arch/m68k/mm/fault.c
*
* Copyright (C) 1995 Hamish Macdonald
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#include <linux/module.h>
#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 (KERN_DEBUG "regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
regs->sr, regs->pc, address, error_code);
#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(KERN_ALERT " at virtual address %08lx\n",address);
die_if_kernel("Oops", regs, error_code);
do_exit(SIGKILL);
return 1;
}
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