path: root/arch/sh/kernel/traps_32.c

/*
 * 'traps.c' handles hardware traps and faults after we have saved some
 * state in 'entry.S'.
 *
 *  SuperH version: Copyright (C) 1999 Niibe Yutaka
 *                  Copyright (C) 2000 Philipp Rumpf
 *                  Copyright (C) 2000 David Howells
 *                  Copyright (C) 2002 - 2007 Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/hardirq.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/io.h>
#include <linux/bug.h>
#include <linux/debug_locks.h>
#include <linux/kdebug.h>
#include <linux/kexec.h>
#include <linux/limits.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sysfs.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/fpu.h>
#include <asm/kprobes.h>

#ifdef CONFIG_CPU_SH2
# define TRAP_RESERVED_INST	4
# define TRAP_ILLEGAL_SLOT_INST	6
# define TRAP_ADDRESS_ERROR	9
# ifdef CONFIG_CPU_SH2A
#  define TRAP_UBC		12
#  define TRAP_FPU_ERROR	13
#  define TRAP_DIVZERO_ERROR	17
#  define TRAP_DIVOVF_ERROR	18
# endif
#else
#define TRAP_RESERVED_INST	12
#define TRAP_ILLEGAL_SLOT_INST	13
#endif

static unsigned long se_user;
static unsigned long se_sys;
static unsigned long se_half;
static unsigned long se_word;
static unsigned long se_dword;
static unsigned long se_multi;
/* bitfield: 1: warn 2: fixup 4: signal -> combinations 2|4 && 1|2|4 are not
   valid! */
static int se_usermode = 3;
/* 0: no warning 1: print a warning message, disabled by default */
static int se_kernmode_warn;

#ifdef CONFIG_PROC_FS
static const char *se_usermode_action[] = {
	"ignored",
	"warn",
	"fixup",
	"fixup+warn",
	"signal",
	"signal+warn"
};

static int alignment_proc_show(struct seq_file *m, void *v)
{
	seq_printf(m, "User:\t\t%lu\n", se_user);
	seq_printf(m, "System:\t\t%lu\n", se_sys);
	seq_printf(m, "Half:\t\t%lu\n", se_half);
	seq_printf(m, "Word:\t\t%lu\n", se_word);
	seq_printf(m, "DWord:\t\t%lu\n", se_dword);
	seq_printf(m, "Multi:\t\t%lu\n", se_multi);
	seq_printf(m, "User faults:\t%i (%s)\n", se_usermode,
			se_usermode_action[se_usermode]);
	seq_printf(m, "Kernel faults:\t%i (fixup%s)\n", se_kernmode_warn,
			se_kernmode_warn ? "+warn" : "");
	return 0;
}

static int alignment_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, alignment_proc_show, NULL);
}

static ssize_t alignment_proc_write(struct file *file,
		const char __user *buffer, size_t count, loff_t *pos)
{
	int *data = PDE(file->f_path.dentry->d_inode)->data;
	char mode;

	if (count > 0) {
		if (get_user(mode, buffer))
			return -EFAULT;
		if (mode >= '0' && mode <= '5')
			*data = mode - '0';
	}
	return count;
}

static const struct file_operations alignment_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= alignment_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= alignment_proc_write,
};
#endif

static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
{
	unsigned long p;
	int i;

	printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);

	for (p = bottom & ~31; p < top; ) {
		printk("%04lx: ", p & 0xffff);

		for (i = 0; i < 8; i++, p += 4) {
			unsigned int val;

			if (p < bottom || p >= top)
				printk("         ");
			else {
				if (__get_user(val, (unsigned int __user *)p)) {
					printk("\n");
					return;
				}
				printk("%08x ", val);
			}
		}
		printk("\n");
	}
}

static DEFINE_SPINLOCK(die_lock);

void die(const