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 <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 */
static int se_kernmode_warn = 1;

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

static int
proc_alignment_read(char *page, char **start, off_t off, int count, int *eof,
		    void *data)
{
	char *p = page;
	int len;

	p += sprintf(p, "User:\t\t%lu\n", se_user);
	p += sprintf(p, "System:\t\t%lu\n", se_sys);
	p += sprintf(p, "Half:\t\t%lu\n", se_half);
	p += sprintf(p, "Word:\t\t%lu\n", se_word);
	p += sprintf(p, "DWord:\t\t%lu\n", se_dword);
	p += sprintf(p, "Multi:\t\t%lu\n", se_multi);
	p += sprintf(p, "User faults:\t%i (%s)\n", se_usermode,
			se_usermode_action[se_usermode]);
	p += sprintf(p, "Kernel faults:\t%i (fixup%s)\n", se_kernmode_warn,
			se_kernmode_warn ? "+warn" : "");

	len = (p - page) - off;
	if (len < 0)
		len = 0;

	*eof = (len <= count) ? 1 : 0;
	*start = page + off;

	return len;
}

static int proc_alignment_write(struct file *file, const char __user *buffer,
				unsigned long count, void *data)
{
	char mode;

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

static int proc_alignment_kern_write(struct file *file, const char __user *buffer,
				     unsigned long count, void *data)
{
	char mode;

	if (count > 0) {
		if (get_user(mode, buffer))
			return -EFAULT;
		if (mode >= '0' && mode <= '1')
			se_kernmode_warn = mode - '0';
	}
	return count;
}
#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: ",