linux-stable-rt/arch/sh/mm/fault-nommu.c

/*
 * arch/sh/mm/fault-nommu.c
 *
 * Copyright (C) 2002 - 2007 Paul Mundt
 *
 * Based on linux/arch/sh/mm/fault.c:
 *  Copyright (C) 1999  Niibe Yutaka
 *
 * Released under the terms of the GNU GPL v2.0.
 */
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/hardirq.h>
#include <linux/kprobes.h>
#include <asm/system.h>
#include <asm/ptrace.h>
#include <asm/kgdb.h>

/*
 * This routine handles page faults.  It determines the address,
 * and the problem, and then passes it off to one of the appropriate
 * routines.
 */
asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
					unsigned long writeaccess,
					unsigned long address)
{
	trace_hardirqs_on();
	local_irq_enable();

#if defined(CONFIG_SH_KGDB)
	if (kgdb_nofault && kgdb_bus_err_hook)
		kgdb_bus_err_hook();
#endif

	/*
	 * Oops. The kernel tried to access some bad page. We'll have to
	 * terminate things with extreme prejudice.
	 *
	 */
	if (address < PAGE_SIZE) {
		printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
	} else {
		printk(KERN_ALERT "Unable to handle kernel paging request");
	}

	printk(" at virtual address %08lx\n", address);
	printk(KERN_ALERT "pc = %08lx\n", regs->pc);

	die("Oops", regs, writeaccess);
	do_exit(SIGKILL);
}

asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs,
					 unsigned long writeaccess,
					 unsigned long address)
{
#if defined(CONFIG_SH_KGDB)
	if (kgdb_nofault && kgdb_bus_err_hook)
		kgdb_bus_err_hook();
#endif

	return (address >= TASK_SIZE);
}