[deliverable/linux.git] / arch / avr32 / kernel / traps.c

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#undef DEBUG
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/notifier.h>

#include <asm/traps.h>
#include <asm/sysreg.h>
#include <asm/addrspace.h>
#include <asm/ocd.h>
#include <asm/mmu_context.h>
#include <asm/uaccess.h>

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");
					goto out;
				}
				printk("%08x ", val);
			}
		}
		printk("\n");
	}

out:
	return;
}

#ifdef CONFIG_FRAME_POINTER
static inline void __show_trace(struct task_struct *tsk, unsigned long *sp,
				struct pt_regs *regs)
{
	unsigned long __user *fp;
	unsigned long __user *last_fp = NULL;

	if (regs) {
		fp = (unsigned long __user *)regs->r7;
	} else if (tsk == current) {
		register unsigned long __user *real_fp __asm__("r7");
		fp = real_fp;
	} else {
		fp = (unsigned long __user *)tsk->thread.cpu_context.r7;
	}

	/*
	 * Walk the stack until (a) we get an exception, (b) the frame
	 * pointer becomes zero, or (c) the frame pointer gets stuck
	 * at the same value.
	 */
	while (fp && fp != last_fp) {
		unsigned long lr, new_fp = 0;

		last_fp = fp;
		if (__get_user(lr, fp))
			break;
		if (fp && __get_user(new_fp, fp + 1))
			break;
		fp = (unsigned long __user *)new_fp;

		printk(" [<%08lx>] ", lr);
		print_symbol("%s\n", lr);
	}
	printk("\n");
}
#else
static inline void __show_trace(struct task_struct *tsk, unsigned long *sp,
				struct pt_regs *regs)
{
	unsigned long addr;

	while (!kstack_end(sp)) {
		addr = *sp++;
		if (kernel_text_address(addr)) {
			printk(" [<%08lx>] ", addr);
			print_symbol("%s\n", addr);
		}
	}
}
#endif

void show_trace(struct task_struct *tsk, unsigned long *sp,
		       struct pt_regs *regs)
{
	if (regs &&
	    (((regs->sr & MODE_MASK) == MODE_EXCEPTION) ||
	     ((regs->sr & MODE_MASK) == MODE_USER)))
		return;

	printk ("Call trace:");
#ifdef CONFIG_KALLSYMS
	printk("\n");
#endif

	__show_trace(tsk, sp, regs);
	printk("\n");
}

void show_stack(struct task_struct *tsk, unsigned long *sp)
{
	unsigned long stack;

	if (!tsk)
		tsk = current;
	if (sp == 0) {
		if (tsk == current) {
			register unsigned long *real_sp __asm__("sp");
			sp = real_sp;
		} else {
			sp = (unsigned long *)tsk->thread.cpu_context.ksp;
		}
	}

	stack = (unsigned long)sp;
	dump_mem("Stack: ", stack,
		 THREAD_SIZE + (unsigned long)tsk->thread_info);
	show_trace(tsk, sp, NULL);
}

void dump_stack(void)
{
	show_stack(NULL, NULL);
}
EXPORT_SYMBOL(dump_stack);

ATOMIC_NOTIFIER_HEAD(avr32_die_chain);

int register_die_notifier(struct notifier_block *nb)
{
	pr_debug("register_die_notifier: %p\n", nb);

	return atomic_notifier_chain_register(&avr32_die_chain, nb);
}
EXPORT_SYMBOL(register_die_notifier);

int unregister_die_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&avr32_die_chain, nb);
}
EXPORT_SYMBOL(unregister_die_notifier);

static DEFINE_SPINLOCK(die_lock);

void __die(const char *str, struct pt_regs *regs, unsigned long err,
	   const char *file, const char *func, unsigned long line)
{
	struct task_struct *tsk = current;
	static int die_counter;

	console_verbose();
	spin_lock_irq(&die_lock);
	bust_spinlocks(1);

	printk(KERN_ALERT "%s", str);
	if (file && func)
		printk(" in %s:%s, line %ld", file, func, line);
	printk("[#%d]:\n", ++die_counter);
	print_modules();
	show_regs(regs);
	printk("Process %s (pid: %d, stack limit = 0x%p)\n",
	       tsk->comm, tsk->pid, tsk->thread_info + 1);

	if (!user_mode(regs) || in_interrupt()) {
		dump_mem("Stack: ", regs->sp,
			 THREAD_SIZE + (unsigned long)tsk->thread_info);
	}

	bust_spinlocks(0);
	spin_unlock_irq(&die_lock);
	do_exit(SIGSEGV);
}

void __die_if_kernel(const char *str, struct pt_regs *regs, unsigned long err,
		     const char *file, const char *func, unsigned long line)
{
	if (!user_mode(regs))
		__die(str, regs, err, file, func, line);
}

asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
{
#ifdef CONFIG_SUBARCH_AVR32B
	/*
	 * The exception entry always saves RSR_EX. For NMI, this is
	 * wrong; it should be RSR_NMI
	 */
	regs->sr = sysreg_read(RSR_NMI);
#endif

	printk("NMI taken!!!!\n");
	die("NMI", regs, ecr);
	BUG();
}

asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
{
	printk("Unable to handle critical exception %lu at pc = %08lx!\n",
	       ecr, regs->pc);
	die("Oops", regs, ecr);
	BUG();
}

asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs)
{
	siginfo_t info;

	die_if_kernel("Oops: Address exception in kernel mode", regs, ecr);

#ifdef DEBUG
	if (ecr == ECR_ADDR_ALIGN_X)
		pr_debug("Instruction Address Exception at pc = %08lx\n",
			 regs->pc);
	else if (ecr == ECR_ADDR_ALIGN_R)
		pr_debug("Data Address Exception (Read) at pc = %08lx\n",
			 regs->pc);
	else if (ecr == ECR_ADDR_ALIGN_W)
		pr_debug("Data Address Exception (Write) at pc = %08lx\n",
			 regs->pc);
	else
		BUG();

	show_regs(regs);
#endif

	info.si_signo = SIGBUS;
	info.si_errno = 0;
	info.si_code = BUS_ADRALN;
	info.si_addr = (void __user *)regs->pc;

	force_sig_info(SIGBUS, &info, current);
}

/* This way of handling undefined instructions is stolen from ARM */
static LIST_HEAD(undef_hook);
static spinlock_t undef_lock = SPIN_LOCK_UNLOCKED;

void register_undef_hook(struct undef_hook *hook)
{
	spin_lock_irq(&undef_lock);
	list_add(&hook->node, &undef_hook);
	spin_unlock_irq(&undef_lock);
}

void unregister_undef_hook(struct undef_hook *hook)
{
	spin_lock_irq(&undef_lock);
	list_del(&hook->node);
	spin_unlock_irq(&undef_lock);
}

static int do_cop_absent(u32 insn)
{
	int cop_nr;
	u32 cpucr;
	if ( (insn & 0xfdf00000) == 0xf1900000 )
		/* LDC0 */
		cop_nr = 0;
	else
		cop_nr = (insn >> 13) & 0x7;

	/* Try enabling the coprocessor */
	cpucr = sysreg_read(CPUCR);
	cpucr |= (1 << (24 + cop_nr));
	sysreg_write(CPUCR, cpucr);

	cpucr = sysreg_read(CPUCR);
	if ( !(cpucr & (1 << (24 + cop_nr))) ){
		printk("Coprocessor #%i not found!\n", cop_nr);
		return -1;
	}

	return 0;
}

#ifdef CONFIG_BUG
#ifdef CONFIG_DEBUG_BUGVERBOSE
static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
{
	char *file;
	u16 line;
	char c;

	if (__get_user(line, (u16 __user *)(regs->pc + 2)))
		return;
	if (__get_user(file, (char * __user *)(regs->pc + 4))
	    || (unsigned long)file < PAGE_OFFSET
	    || __get_user(c, file))
		file = "<bad filename>";

	printk(KERN_ALERT "kernel BUG at %s:%d!\n", file, line);
}
#else
static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
{

}
#endif
#endif

asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
{
	u32 insn;
	struct undef_hook *hook;
	siginfo_t info;
	void __user *pc;

	if (!user_mode(regs))
		goto kernel_trap;

	local_irq_enable();

	pc = (void __user *)instruction_pointer(regs);
	if (__get_user(insn, (u32 __user *)pc))
		goto invalid_area;

        if (ecr == ECR_COPROC_ABSENT) {
		if (do_cop_absent(insn) == 0)
			return;
        }

	spin_lock_irq(&undef_lock);
	list_for_each_entry(hook, &undef_hook, node) {
		if ((insn & hook->insn_mask) == hook->insn_val) {
			if (hook->fn(regs, insn) == 0) {
				spin_unlock_irq(&undef_lock);
				return;
			}
		}
	}
	spin_unlock_irq(&undef_lock);

invalid_area:

#ifdef DEBUG
	printk("Illegal instruction at pc = %08lx\n", regs->pc);
	if (regs->pc < TASK_SIZE) {
		unsigned long ptbr, pgd, pte, *p;

		ptbr = sysreg_read(PTBR);
		p = (unsigned long *)ptbr;
		pgd = p[regs->pc >> 22];
		p = (unsigned long *)((pgd & 0x1ffff000) | 0x80000000);
		pte = p[(regs->pc >> 12) & 0x3ff];
		printk("page table: 0x%08lx -> 0x%08lx -> 0x%08lx\n", ptbr, pgd, pte);
	}
#endif

	info.si_signo = SIGILL;
	info.si_errno = 0;
	info.si_addr = (void __user *)regs->pc;
	switch (ecr) {
	case ECR_ILLEGAL_OPCODE:
	case ECR_UNIMPL_INSTRUCTION:
		info.si_code = ILL_ILLOPC;
		break;
	case ECR_PRIVILEGE_VIOLATION:
		info.si_code = ILL_PRVOPC;
		break;
	case ECR_COPROC_ABSENT:
		info.si_code = ILL_COPROC;
		break;
	default:
		BUG();
	}

	force_sig_info(SIGILL, &info, current);
	return;

kernel_trap:
#ifdef CONFIG_BUG
	if (__kernel_text_address(instruction_pointer(regs))) {
		insn = *(u16 *)instruction_pointer(regs);
		if (insn == AVR32_BUG_OPCODE) {
			do_bug_verbose(regs, insn);
			die("Kernel BUG", regs, 0);
			return;
		}
	}
#endif

	die("Oops: Illegal instruction in kernel code", regs, ecr);
}

asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs)
{
	siginfo_t info;

	printk("Floating-point exception at pc = %08lx\n", regs->pc);

	/* We have no FPU... */
	info.si_signo = SIGILL;
	info.si_errno = 0;
	info.si_addr = (void __user *)regs->pc;
	info.si_code = ILL_COPROC;

	force_sig_info(SIGILL, &info, current);
}


void __init trap_init(void)
{

}
Commit	Line	Data
5f97f7f9 HS	1	/*
	2	* Copyright (C) 2004-2006 Atmel Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8	#undef DEBUG
	9	#include <linux/sched.h>
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/kallsyms.h>
	13	#include <linux/notifier.h>
	14
	15	#include <asm/traps.h>
	16	#include <asm/sysreg.h>
	17	#include <asm/addrspace.h>
	18	#include <asm/ocd.h>
	19	#include <asm/mmu_context.h>
	20	#include <asm/uaccess.h>
	21
	22	static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
	23	{
	24	unsigned long p;
	25	int i;
	26
	27	printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
	28
	29	for (p = bottom & ~31; p < top; ) {
	30	printk("%04lx: ", p & 0xffff);
	31
	32	for (i = 0; i < 8; i++, p += 4) {
	33	unsigned int val;
	34
	35	if (p < bottom \|\| p >= top)
	36	printk(" ");
	37	else {
	38	if (__get_user(val, (unsigned int __user *)p)) {
	39	printk("\n");
	40	goto out;
	41	}
	42	printk("%08x ", val);
	43	}
	44	}
	45	printk("\n");
	46	}
	47
	48	out:
	49	return;
	50	}
	51
	52	#ifdef CONFIG_FRAME_POINTER
	53	static inline void __show_trace(struct task_struct tsk, unsigned long sp,
	54	struct pt_regs *regs)
	55	{
	56	unsigned long __user *fp;
	57	unsigned long __user *last_fp = NULL;
	58
	59	if (regs) {
	60	fp = (unsigned long __user *)regs->r7;
	61	} else if (tsk == current) {
	62	register unsigned long __user *real_fp __asm__("r7");
	63	fp = real_fp;
	64	} else {
65	fp = (unsigned long __user *)tsk->thread.cpu_context.r7;
66	}
67
68	/*
69	* Walk the stack until (a) we get an exception, (b) the frame
70	* pointer becomes zero, or (c) the frame pointer gets stuck
71	* at the same value.
72	*/
73	while (fp && fp != last_fp) {
74	unsigned long lr, new_fp = 0;
75
76	last_fp = fp;
77	if (__get_user(lr, fp))
78	break;
79	if (fp && __get_user(new_fp, fp + 1))
80	break;
81	fp = (unsigned long __user *)new_fp;
82
83	printk(" [<%08lx>] ", lr);
84	print_symbol("%s\n", lr);
85	}
86	printk("\n");
87	}
88	#else
89	static inline void __show_trace(struct task_struct tsk, unsigned long sp,
90	struct pt_regs *regs)
91	{
92	unsigned long addr;
93
94	while (!kstack_end(sp)) {
95	addr = *sp++;
96	if (kernel_text_address(addr)) {
97	printk(" [<%08lx>] ", addr);
98	print_symbol("%s\n", addr);
99	}
100	}
101	}
102	#endif
103
104	void show_trace(struct task_struct tsk, unsigned long sp,
105	struct pt_regs *regs)
106	{
107	if (regs &&
108	(((regs->sr & MODE_MASK) == MODE_EXCEPTION) \|\|
109	((regs->sr & MODE_MASK) == MODE_USER)))
110	return;
111
112	printk ("Call trace:");
113	#ifdef CONFIG_KALLSYMS
114	printk("\n");
115	#endif
116
117	__show_trace(tsk, sp, regs);
118	printk("\n");
119	}
120
121	void show_stack(struct task_struct tsk, unsigned long sp)
122	{
123	unsigned long stack;
124
125	if (!tsk)
126	tsk = current;
127	if (sp == 0) {
128	if (tsk == current) {
129	register unsigned long *real_sp __asm__("sp");
130	sp = real_sp;
131	} else {
132	sp = (unsigned long *)tsk->thread.cpu_context.ksp;
133	}
134	}
135
136	stack = (unsigned long)sp;
137	dump_mem("Stack: ", stack,
138	THREAD_SIZE + (unsigned long)tsk->thread_info);
139	show_trace(tsk, sp, NULL);
140	}
141
142	void dump_stack(void)
143	{
144	show_stack(NULL, NULL);
145	}
146	EXPORT_SYMBOL(dump_stack);
147
148	ATOMIC_NOTIFIER_HEAD(avr32_die_chain);
149
150	int register_die_notifier(struct notifier_block *nb)
151	{
152	pr_debug("register_die_notifier: %p\n", nb);
153
154	return atomic_notifier_chain_register(&avr32_die_chain, nb);
155	}
156	EXPORT_SYMBOL(register_die_notifier);
157
158	int unregister_die_notifier(struct notifier_block *nb)
159	{
160	return atomic_notifier_chain_unregister(&avr32_die_chain, nb);
161	}
162	EXPORT_SYMBOL(unregister_die_notifier);
163
164	static DEFINE_SPINLOCK(die_lock);
165
166	void __die(const char str, struct pt_regs regs, unsigned long err,
167	const char file, const char func, unsigned long line)
168	{
169	struct task_struct *tsk = current;
170	static int die_counter;
171
172	console_verbose();
173	spin_lock_irq(&die_lock);
174	bust_spinlocks(1);
175
176	printk(KERN_ALERT "%s", str);
177	if (file && func)
178	printk(" in %s:%s, line %ld", file, func, line);
179	printk("[#%d]:\n", ++die_counter);
180	print_modules();
181	show_regs(regs);
182	printk("Process %s (pid: %d, stack limit = 0x%p)\n",
183	tsk->comm, tsk->pid, tsk->thread_info + 1);
184
185	if (!user_mode(regs) \|\| in_interrupt()) {
186	dump_mem("Stack: ", regs->sp,
187	THREAD_SIZE + (unsigned long)tsk->thread_info);
188	}
189
190	bust_spinlocks(0);
191	spin_unlock_irq(&die_lock);
192	do_exit(SIGSEGV);
193	}
194
195	void __die_if_kernel(const char str, struct pt_regs regs, unsigned long err,
196	const char file, const char func, unsigned long line)
197	{
198	if (!user_mode(regs))
199	__die(str, regs, err, file, func, line);
200	}
201
202	asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
203	{
204	#ifdef CONFIG_SUBARCH_AVR32B
205	/*
206	* The exception entry always saves RSR_EX. For NMI, this is
207	* wrong; it should be RSR_NMI
208	*/
209	regs->sr = sysreg_read(RSR_NMI);
210	#endif
211
212	printk("NMI taken!!!!\n");
213	die("NMI", regs, ecr);
214	BUG();
215	}
216
217	asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
218	{
219	printk("Unable to handle critical exception %lu at pc = %08lx!\n",
220	ecr, regs->pc);
221	die("Oops", regs, ecr);
222	BUG();
223	}
224
225	asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs)
226	{
227	siginfo_t info;
228
229	die_if_kernel("Oops: Address exception in kernel mode", regs, ecr);
230
231	#ifdef DEBUG
232	if (ecr == ECR_ADDR_ALIGN_X)
233	pr_debug("Instruction Address Exception at pc = %08lx\n",
234	regs->pc);
235	else if (ecr == ECR_ADDR_ALIGN_R)
236	pr_debug("Data Address Exception (Read) at pc = %08lx\n",
237	regs->pc);
238	else if (ecr == ECR_ADDR_ALIGN_W)
239	pr_debug("Data Address Exception (Write) at pc = %08lx\n",
240	regs->pc);
241	else
242	BUG();
243
244	show_regs(regs);
245	#endif
246
247	info.si_signo = SIGBUS;
248	info.si_errno = 0;
249	info.si_code = BUS_ADRALN;
250	info.si_addr = (void __user *)regs->pc;
251
252	force_sig_info(SIGBUS, &info, current);
253	}
254
255	/* This way of handling undefined instructions is stolen from ARM */
256	static LIST_HEAD(undef_hook);
257	static spinlock_t undef_lock = SPIN_LOCK_UNLOCKED;
258
259	void register_undef_hook(struct undef_hook *hook)
260	{
261	spin_lock_irq(&undef_lock);
262	list_add(&hook->node, &undef_hook);
263	spin_unlock_irq(&undef_lock);
264	}
265
266	void unregister_undef_hook(struct undef_hook *hook)
267	{
268	spin_lock_irq(&undef_lock);
269	list_del(&hook->node);
270	spin_unlock_irq(&undef_lock);
271	}
272
273	static int do_cop_absent(u32 insn)
274	{
275	int cop_nr;
276	u32 cpucr;
277	if ( (insn & 0xfdf00000) == 0xf1900000 )
278	/* LDC0 */
279	cop_nr = 0;
280	else
281	cop_nr = (insn >> 13) & 0x7;
282
283	/* Try enabling the coprocessor */
284	cpucr = sysreg_read(CPUCR);
285	cpucr \|= (1 << (24 + cop_nr));
286	sysreg_write(CPUCR, cpucr);
287
288	cpucr = sysreg_read(CPUCR);
289	if ( !(cpucr & (1 << (24 + cop_nr))) ){
290	printk("Coprocessor #%i not found!\n", cop_nr);
291	return -1;
292	}
293
294	return 0;
295	}
296
297	#ifdef CONFIG_BUG
298	#ifdef CONFIG_DEBUG_BUGVERBOSE
299	static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
300	{
301	char *file;
302	u16 line;
303	char c;
304
305	if (__get_user(line, (u16 __user *)(regs->pc + 2)))
306	return;
307	if (__get_user(file, (char * __user *)(regs->pc + 4))
308	\|\| (unsigned long)file < PAGE_OFFSET
309	\|\| __get_user(c, file))
310	file = "<bad filename>";
311
312	printk(KERN_ALERT "kernel BUG at %s:%d!\n", file, line);
313	}
314	#else
315	static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
316	{
317
318	}
319	#endif
320	#endif
321
322	asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
323	{
324	u32 insn;
325	struct undef_hook *hook;
326	siginfo_t info;
327	void __user *pc;
328
329	if (!user_mode(regs))
330	goto kernel_trap;
331
332	local_irq_enable();
333
334	pc = (void __user *)instruction_pointer(regs);
335	if (__get_user(insn, (u32 __user *)pc))
336	goto invalid_area;
337
338	if (ecr == ECR_COPROC_ABSENT) {
339	if (do_cop_absent(insn) == 0)
340	return;
341	}
342
343	spin_lock_irq(&undef_lock);
344	list_for_each_entry(hook, &undef_hook, node) {
345	if ((insn & hook->insn_mask) == hook->insn_val) {
346	if (hook->fn(regs, insn) == 0) {
347	spin_unlock_irq(&undef_lock);
348	return;
349	}
350	}
351	}
352	spin_unlock_irq(&undef_lock);
353
354	invalid_area:
355
356	#ifdef DEBUG
357	printk("Illegal instruction at pc = %08lx\n", regs->pc);
358	if (regs->pc < TASK_SIZE) {
359	unsigned long ptbr, pgd, pte, *p;
360
361	ptbr = sysreg_read(PTBR);
362	p = (unsigned long *)ptbr;
363	pgd = p[regs->pc >> 22];
364	p = (unsigned long *)((pgd & 0x1ffff000) \| 0x80000000);
365	pte = p[(regs->pc >> 12) & 0x3ff];
366	printk("page table: 0x%08lx -> 0x%08lx -> 0x%08lx\n", ptbr, pgd, pte);
367	}
368	#endif
369
370	info.si_signo = SIGILL;
371	info.si_errno = 0;
372	info.si_addr = (void __user *)regs->pc;
373	switch (ecr) {
374	case ECR_ILLEGAL_OPCODE:
375	case ECR_UNIMPL_INSTRUCTION:
376	info.si_code = ILL_ILLOPC;
377	break;
378	case ECR_PRIVILEGE_VIOLATION:
379	info.si_code = ILL_PRVOPC;
380	break;
381	case ECR_COPROC_ABSENT:
382	info.si_code = ILL_COPROC;
383	break;
384	default:
385	BUG();
386	}
387
388	force_sig_info(SIGILL, &info, current);
389	return;
390
391	kernel_trap:
392	#ifdef CONFIG_BUG
393	if (__kernel_text_address(instruction_pointer(regs))) {
394	insn = (u16 )instruction_pointer(regs);
395	if (insn == AVR32_BUG_OPCODE) {
396	do_bug_verbose(regs, insn);
397	die("Kernel BUG", regs, 0);
398	return;
399	}
400	}
401	#endif
402
403	die("Oops: Illegal instruction in kernel code", regs, ecr);
404	}
405
406	asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs)
407	{
408	siginfo_t info;
409
410	printk("Floating-point exception at pc = %08lx\n", regs->pc);
411
412	/* We have no FPU... */
413	info.si_signo = SIGILL;
414	info.si_errno = 0;
415	info.si_addr = (void __user *)regs->pc;
416	info.si_code = ILL_COPROC;
417
418	force_sig_info(SIGILL, &info, current);
419	}
420
421
422	void __init trap_init(void)
423	{
424
425	}