[linux-2.6-block.git] / arch / x86 / kernel / dumpstack_32.c

/*
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
 */
#include <linux/kallsyms.h>
#include <linux/kprobes.h>
#include <linux/uaccess.h>
#include <linux/utsname.h>
#include <linux/hardirq.h>
#include <linux/kdebug.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/kexec.h>
#include <linux/bug.h>
#include <linux/nmi.h>

#include <asm/stacktrace.h>

#define STACKSLOTS_PER_LINE 8
#define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :)

int panic_on_unrecovered_nmi;
int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
static unsigned int code_bytes = 64;
static int die_counter;

void printk_address(unsigned long address, int reliable)
{
	printk(" [<%p>] %s%pS\n", (void *) address,
			reliable ? "" : "? ", (void *) address);
}

static inline int valid_stack_ptr(struct thread_info *tinfo,
			void *p, unsigned int size, void *end)
{
	void *t = tinfo;
	if (end) {
		if (p < end && p >= (end-THREAD_SIZE))
			return 1;
		else
			return 0;
	}
	return p > t && p < t + THREAD_SIZE - size;
}

/* The form of the top of the frame on the stack */
struct stack_frame {
	struct stack_frame *next_frame;
	unsigned long return_address;
};

static inline unsigned long
print_context_stack(struct thread_info *tinfo,
		unsigned long *stack, unsigned long bp,
		const struct stacktrace_ops *ops, void *data,
		unsigned long *end)
{
	struct stack_frame *frame = (struct stack_frame *)bp;

	while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
		unsigned long addr;

		addr = *stack;
		if (__kernel_text_address(addr)) {
			if ((unsigned long) stack == bp + sizeof(long)) {
				ops->address(data, addr, 1);
				frame = frame->next_frame;
				bp = (unsigned long) frame;
			} else {
				ops->address(data, addr, bp == 0);
			}
		}
		stack++;
	}
	return bp;
}

void dump_trace(struct task_struct *task, struct pt_regs *regs,
		unsigned long *stack, unsigned long bp,
		const struct stacktrace_ops *ops, void *data)
{
	if (!task)
		task = current;

	if (!stack) {
		unsigned long dummy;
		stack = &dummy;
		if (task && task != current)
			stack = (unsigned long *)task->thread.sp;
	}

#ifdef CONFIG_FRAME_POINTER
	if (!bp) {
		if (task == current) {
			/* Grab bp right from our regs */
			get_bp(bp);
		} else {
			/* bp is the last reg pushed by switch_to */
			bp = *(unsigned long *) task->thread.sp;
		}
	}
#endif

	for (;;) {
		struct thread_info *context;

		context = (struct thread_info *)
			((unsigned long)stack & (~(THREAD_SIZE - 1)));
		bp = print_context_stack(context, stack, bp, ops, data, NULL);

		stack = (unsigned long *)context->previous_esp;
		if (!stack)
			break;
		if (ops->stack(data, "IRQ") < 0)
			break;
		touch_nmi_watchdog();
	}
}
EXPORT_SYMBOL(dump_trace);

static void
print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
{
	printk(data);
	print_symbol(msg, symbol);
	printk("\n");
}

static void print_trace_warning(void *data, char *msg)
{
	printk("%s%s\n", (char *)data, msg);
}

static int print_trace_stack(void *data, char *name)
{
	printk("%s <%s> ", (char *)data, name);
	return 0;
}

/*
 * Print one address/symbol entries per line.
 */
static void print_trace_address(void *data, unsigned long addr, int reliable)
{
	touch_nmi_watchdog();
	printk(data);
	printk_address(addr, reliable);
}

static const struct stacktrace_ops print_trace_ops = {
	.warning = print_trace_warning,
	.warning_symbol = print_trace_warning_symbol,
	.stack = print_trace_stack,
	.address = print_trace_address,
};

static void
show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
		unsigned long *stack, unsigned long bp, char *log_lvl)
{
	printk("%sCall Trace:\n", log_lvl);
	dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
}

void show_trace(struct task_struct *task, struct pt_regs *regs,
		unsigned long *stack, unsigned long bp)
{
	show_trace_log_lvl(task, regs, stack, bp, "");
}

static void
show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
		unsigned long *sp, unsigned long bp, char *log_lvl)
{
	unsigned long *stack;
	int i;

	if (sp == NULL) {
		if (task)
			sp = (unsigned long *)task->thread.sp;
		else
			sp = (unsigned long *)&sp;
	}

	stack = sp;
	for (i = 0; i < kstack_depth_to_print; i++) {
		if (kstack_end(stack))
			break;
		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
			printk("\n%s", log_lvl);
		printk(" %08lx", *stack++);
		touch_nmi_watchdog();
	}
	printk("\n");
	show_trace_log_lvl(task, regs, sp, bp, log_lvl);
}

void show_stack(struct task_struct *task, unsigned long *sp)
{
	show_stack_log_lvl(task, NULL, sp, 0, "");
}

/*
 * The architecture-independent dump_stack generator
 */
void dump_stack(void)
{
	unsigned long bp = 0;
	unsigned long stack;

#ifdef CONFIG_FRAME_POINTER
	if (!bp)
		get_bp(bp);
#endif

	printk("Pid: %d, comm: %.20s %s %s %.*s\n",
		current->pid, current->comm, print_tainted(),
		init_utsname()->release,
		(int)strcspn(init_utsname()->version, " "),
		init_utsname()->version);
	show_trace(NULL, NULL, &stack, bp);
}

EXPORT_SYMBOL(dump_stack);

void show_registers(struct pt_regs *regs)
{
	int i;

	print_modules();
	__show_regs(regs, 0);

	printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
		TASK_COMM_LEN, current->comm, task_pid_nr(current),
		current_thread_info(), current, task_thread_info(current));
	/*
	 * When in-kernel, we also print out the stack and code at the
	 * time of the fault..
	 */
	if (!user_mode_vm(regs)) {
		unsigned int code_prologue = code_bytes * 43 / 64;
		unsigned int code_len = code_bytes;
		unsigned char c;
		u8 *ip;

		printk(KERN_EMERG "Stack:\n");
		show_stack_log_lvl(NULL, regs, &regs->sp,
				0, KERN_EMERG);

		printk(KERN_EMERG "Code: ");

		ip = (u8 *)regs->ip - code_prologue;
		if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
			/* try starting at IP */
			ip = (u8 *)regs->ip;
			code_len = code_len - code_prologue + 1;
		}
		for (i = 0; i < code_len; i++, ip++) {
			if (ip < (u8 *)PAGE_OFFSET ||
					probe_kernel_address(ip, c)) {
				printk(" Bad EIP value.");
				break;
			}
			if (ip == (u8 *)regs->ip)
				printk("<%02x> ", c);
			else
				printk("%02x ", c);
		}
	}
	printk("\n");
}

int is_valid_bugaddr(unsigned long ip)
{
	unsigned short ud2;

	if (ip < PAGE_OFFSET)
		return 0;
	if (probe_kernel_address((unsigned short *)ip, ud2))
		return 0;

	return ud2 == 0x0b0f;
}

static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED;
static int die_owner = -1;
static unsigned int die_nest_count;

unsigned __kprobes long oops_begin(void)
{
	unsigned long flags;

	oops_enter();

	if (die_owner != raw_smp_processor_id()) {
		console_verbose();
		raw_local_irq_save(flags);
		__raw_spin_lock(&die_lock);
		die_owner = smp_processor_id();
		die_nest_count = 0;
		bust_spinlocks(1);
	} else {
		raw_local_irq_save(flags);
	}
	die_nest_count++;
	return flags;
}

void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
	bust_spinlocks(0);
	die_owner = -1;
	add_taint(TAINT_DIE);
	__raw_spin_unlock(&die_lock);
	raw_local_irq_restore(flags);

	if (!regs)
		return;

	if (kexec_should_crash(current))
		crash_kexec(regs);
	if (in_interrupt())
		panic("Fatal exception in interrupt");
	if (panic_on_oops)
		panic("Fatal exception");
	oops_exit();
	do_exit(signr);
}

int __kprobes __die(const char *str, struct pt_regs *regs, long err)
{
	unsigned short ss;
	unsigned long sp;

	printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
	printk("PREEMPT ");
#endif
#ifdef CONFIG_SMP
	printk("SMP ");
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
	printk("DEBUG_PAGEALLOC");
#endif
	printk("\n");
	if (notify_die(DIE_OOPS, str, regs, err,
			current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
		return 1;

	show_registers(regs);
	/* Executive summary in case the oops scrolled away */
	sp = (unsigned long) (&regs->sp);
	savesegment(ss, ss);
	if (user_mode(regs)) {
		sp = regs->sp;
		ss = regs->ss & 0xffff;
	}
	printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
	print_symbol("%s", regs->ip);
	printk(" SS:ESP %04x:%08lx\n", ss, sp);
	return 0;
}

/*
 * This is gone through when something in the kernel has done something bad
 * and is about to be terminated:
 */
void die(const char *str, struct pt_regs *regs, long err)
{
	unsigned long flags = oops_begin();

	if (die_nest_count < 3) {
		report_bug(regs->ip, regs);

		if (__die(str, regs, err))
			regs = NULL;
	} else {
		printk(KERN_EMERG "Recursive die() failure, output suppressed\n");
	}

	oops_end(flags, regs, SIGSEGV);
}

static DEFINE_SPINLOCK(nmi_print_lock);

void notrace __kprobes
die_nmi(char *str, struct pt_regs *regs, int do_panic)
{
	if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
		return;

	spin_lock(&nmi_print_lock);
	/*
	* We are in trouble anyway, lets at least try
	* to get a message out:
	*/
	bust_spinlocks(1);
	printk(KERN_EMERG "%s", str);
	printk(" on CPU%d, ip %08lx, registers:\n",
		smp_processor_id(), regs->ip);
	show_registers(regs);
	if (do_panic)
		panic("Non maskable interrupt");
	console_silent();
	spin_unlock(&nmi_print_lock);
	bust_spinlocks(0);

	/*
	 * If we are in kernel we are probably nested up pretty bad
	 * and might aswell get out now while we still can:
	 */
	if (!user_mode_vm(regs)) {
		current->thread.trap_no = 2;
		crash_kexec(regs);
	}

	do_exit(SIGSEGV);
}

static int __init oops_setup(char *s)
{
	if (!s)
		return -EINVAL;
	if (!strcmp(s, "panic"))
		panic_on_oops = 1;
	return 0;
}
early_param("oops", oops_setup);

static int __init kstack_setup(char *s)
{
	if (!s)
		return -EINVAL;
	kstack_depth_to_print = simple_strtoul(s, NULL, 0);
	return 0;
}
early_param("kstack", kstack_setup);

static int __init code_bytes_setup(char *s)
{
	code_bytes = simple_strtoul(s, NULL, 0);
	if (code_bytes > 8192)
		code_bytes = 8192;

	return 1;
}
__setup("code_bytes=", code_bytes_setup);
Commit	Line	Data
2bc5f927 AH	1	/*
	2	* Copyright (C) 1991, 1992 Linus Torvalds
	3	* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
	4	*/
	5	#include <linux/kallsyms.h>
	6	#include <linux/kprobes.h>
	7	#include <linux/uaccess.h>
	8	#include <linux/utsname.h>
	9	#include <linux/hardirq.h>
	10	#include <linux/kdebug.h>
	11	#include <linux/module.h>
	12	#include <linux/ptrace.h>
	13	#include <linux/kexec.h>
	14	#include <linux/bug.h>
	15	#include <linux/nmi.h>
	16
	17	#include <asm/stacktrace.h>
	18
8a541665 AH	19	#define STACKSLOTS_PER_LINE 8
	20	#define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :)
	21
2bc5f927	22	int panic_on_unrecovered_nmi;
8a541665	23	int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
2bc5f927 AH	24	static unsigned int code_bytes = 64;
	25	static int die_counter;
	26
	27	void printk_address(unsigned long address, int reliable)
	28	{
16182790 AH	29	printk(" [<%p>] %s%pS\n", (void *) address,
16182790 AH	30	reliable ? "" : "? ", (void *) address);
2bc5f927 AH	31	}
	32
	33	static inline int valid_stack_ptr(struct thread_info *tinfo,
3a18512d	34	void p, unsigned int size, void end)
2bc5f927 AH	35	{
2bc5f927 AH	36	void *t = tinfo;
3a18512d AH	37	if (end) {
	38	if (p < end && p >= (end-THREAD_SIZE))
	39	return 1;
	40	else
	41	return 0;
	42	}
	43	return p > t && p < t + THREAD_SIZE - size;
2bc5f927 AH	44	}
	45
	46	/* The form of the top of the frame on the stack */
	47	struct stack_frame {
	48	struct stack_frame *next_frame;
	49	unsigned long return_address;
	50	};
	51
	52	static inline unsigned long
	53	print_context_stack(struct thread_info *tinfo,
	54	unsigned long *stack, unsigned long bp,
3a18512d AH	55	const struct stacktrace_ops ops, void data,
3a18512d AH	56	unsigned long *end)
2bc5f927 AH	57	{
	58	struct stack_frame frame = (struct stack_frame )bp;
	59
3a18512d	60	while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
2bc5f927 AH	61	unsigned long addr;
	62
	63	addr = *stack;
	64	if (__kernel_text_address(addr)) {
3a18512d	65	if ((unsigned long) stack == bp + sizeof(long)) {
2bc5f927 AH	66	ops->address(data, addr, 1);
	67	frame = frame->next_frame;
	68	bp = (unsigned long) frame;
	69	} else {
	70	ops->address(data, addr, bp == 0);
	71	}
	72	}
	73	stack++;
	74	}
	75	return bp;
	76	}
	77
	78	void dump_trace(struct task_struct task, struct pt_regs regs,
	79	unsigned long *stack, unsigned long bp,
	80	const struct stacktrace_ops ops, void data)
	81	{
	82	if (!task)
	83	task = current;
	84
	85	if (!stack) {
	86	unsigned long dummy;
	87	stack = &dummy;
8a541665	88	if (task && task != current)
2bc5f927 AH	89	stack = (unsigned long *)task->thread.sp;
	90	}
	91
	92	#ifdef CONFIG_FRAME_POINTER
	93	if (!bp) {
	94	if (task == current) {
	95	/* Grab bp right from our regs */
8a541665	96	get_bp(bp);
2bc5f927 AH	97	} else {
	98	/* bp is the last reg pushed by switch_to */
	99	bp = (unsigned long ) task->thread.sp;
	100	}
	101	}
	102	#endif
	103
	104	for (;;) {
	105	struct thread_info *context;
	106
	107	context = (struct thread_info *)
	108	((unsigned long)stack & (~(THREAD_SIZE - 1)));
3a18512d	109	bp = print_context_stack(context, stack, bp, ops, data, NULL);
2ac53721	110
2bc5f927 AH	111	stack = (unsigned long *)context->previous_esp;
	112	if (!stack)
	113	break;
2ac53721 AH	114	if (ops->stack(data, "IRQ") < 0)
2ac53721 AH	115	break;
2bc5f927 AH	116	touch_nmi_watchdog();
	117	}
	118	}
	119	EXPORT_SYMBOL(dump_trace);
	120
	121	static void
	122	print_trace_warning_symbol(void data, char msg, unsigned long symbol)
	123	{
	124	printk(data);
	125	print_symbol(msg, symbol);
	126	printk("\n");
	127	}
	128
	129	static void print_trace_warning(void data, char msg)
	130	{
	131	printk("%s%s\n", (char *)data, msg);
	132	}
	133
	134	static int print_trace_stack(void data, char name)
	135	{
2ac53721	136	printk("%s <%s> ", (char *)data, name);
2bc5f927 AH	137	return 0;
	138	}
	139
	140	/*
	141	* Print one address/symbol entries per line.
	142	*/
	143	static void print_trace_address(void *data, unsigned long addr, int reliable)
	144	{
2bc5f927	145	touch_nmi_watchdog();
2ac53721 AH	146	printk(data);
2ac53721 AH	147	printk_address(addr, reliable);
2bc5f927 AH	148	}
	149
	150	static const struct stacktrace_ops print_trace_ops = {
	151	.warning = print_trace_warning,
	152	.warning_symbol = print_trace_warning_symbol,
	153	.stack = print_trace_stack,
	154	.address = print_trace_address,
	155	};
	156
	157	static void
	158	show_trace_log_lvl(struct task_struct task, struct pt_regs regs,
	159	unsigned long stack, unsigned long bp, char log_lvl)
	160	{
ca0a8164	161	printk("%sCall Trace:\n", log_lvl);
2bc5f927	162	dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
2bc5f927 AH	163	}
	164
	165	void show_trace(struct task_struct task, struct pt_regs regs,
	166	unsigned long *stack, unsigned long bp)
	167	{
	168	show_trace_log_lvl(task, regs, stack, bp, "");
	169	}
	170
	171	static void
	172	show_stack_log_lvl(struct task_struct task, struct pt_regs regs,
8a541665	173	unsigned long sp, unsigned long bp, char log_lvl)
2bc5f927 AH	174	{
	175	unsigned long *stack;
	176	int i;
	177
	178	if (sp == NULL) {
	179	if (task)
	180	sp = (unsigned long *)task->thread.sp;
	181	else
	182	sp = (unsigned long *)&sp;
	183	}
	184
	185	stack = sp;
	186	for (i = 0; i < kstack_depth_to_print; i++) {
	187	if (kstack_end(stack))
	188	break;
8a541665	189	if (i && ((i % STACKSLOTS_PER_LINE) == 0))
ca0a8164 AH	190	printk("\n%s", log_lvl);
	191	printk(" %08lx", *stack++);
	192	touch_nmi_watchdog();
2bc5f927	193	}
ca0a8164	194	printk("\n");
2bc5f927 AH	195	show_trace_log_lvl(task, regs, sp, bp, log_lvl);
	196	}
	197
	198	void show_stack(struct task_struct task, unsigned long sp)
	199	{
2bc5f927 AH	200	show_stack_log_lvl(task, NULL, sp, 0, "");
	201	}
	202
	203	/*
	204	* The architecture-independent dump_stack generator
	205	*/
	206	void dump_stack(void)
	207	{
	208	unsigned long bp = 0;
	209	unsigned long stack;
	210
	211	#ifdef CONFIG_FRAME_POINTER
	212	if (!bp)
8a541665	213	get_bp(bp);
2bc5f927 AH	214	#endif
	215
	216	printk("Pid: %d, comm: %.20s %s %s %.*s\n",
	217	current->pid, current->comm, print_tainted(),
	218	init_utsname()->release,
	219	(int)strcspn(init_utsname()->version, " "),
	220	init_utsname()->version);
8a541665	221	show_trace(NULL, NULL, &stack, bp);
2bc5f927 AH	222	}
	223
	224	EXPORT_SYMBOL(dump_stack);
	225
	226	void show_registers(struct pt_regs *regs)
	227	{
	228	int i;
	229
	230	print_modules();
	231	__show_regs(regs, 0);
	232
ca0a8164	233	printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
2bc5f927 AH	234	TASK_COMM_LEN, current->comm, task_pid_nr(current),
	235	current_thread_info(), current, task_thread_info(current));
	236	/*
	237	* When in-kernel, we also print out the stack and code at the
	238	* time of the fault..
	239	*/
	240	if (!user_mode_vm(regs)) {
	241	unsigned int code_prologue = code_bytes * 43 / 64;
	242	unsigned int code_len = code_bytes;
	243	unsigned char c;
	244	u8 *ip;
	245
ca0a8164 AH	246	printk(KERN_EMERG "Stack:\n");
	247	show_stack_log_lvl(NULL, regs, &regs->sp,
	248	0, KERN_EMERG);
2bc5f927 AH	249
	250	printk(KERN_EMERG "Code: ");
	251
	252	ip = (u8 *)regs->ip - code_prologue;
	253	if (ip < (u8 *)PAGE_OFFSET \|\| probe_kernel_address(ip, c)) {
8a541665	254	/* try starting at IP */
2bc5f927 AH	255	ip = (u8 *)regs->ip;
	256	code_len = code_len - code_prologue + 1;
	257	}
	258	for (i = 0; i < code_len; i++, ip++) {
	259	if (ip < (u8 *)PAGE_OFFSET \|\|
	260	probe_kernel_address(ip, c)) {
	261	printk(" Bad EIP value.");
	262	break;
	263	}
	264	if (ip == (u8 *)regs->ip)
	265	printk("<%02x> ", c);
	266	else
	267	printk("%02x ", c);
	268	}
	269	}
	270	printk("\n");
	271	}
	272
	273	int is_valid_bugaddr(unsigned long ip)
	274	{
	275	unsigned short ud2;
	276
	277	if (ip < PAGE_OFFSET)
	278	return 0;
	279	if (probe_kernel_address((unsigned short *)ip, ud2))
	280	return 0;
	281
	282	return ud2 == 0x0b0f;
	283	}
	284
	285	static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED;
	286	static int die_owner = -1;
	287	static unsigned int die_nest_count;
	288
	289	unsigned __kprobes long oops_begin(void)
	290	{
	291	unsigned long flags;
	292
	293	oops_enter();
	294
	295	if (die_owner != raw_smp_processor_id()) {
	296	console_verbose();
	297	raw_local_irq_save(flags);
	298	__raw_spin_lock(&die_lock);
	299	die_owner = smp_processor_id();
	300	die_nest_count = 0;
	301	bust_spinlocks(1);
	302	} else {
	303	raw_local_irq_save(flags);
	304	}
	305	die_nest_count++;
	306	return flags;
	307	}
	308
	309	void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
	310	{
	311	bust_spinlocks(0);
	312	die_owner = -1;
	313	add_taint(TAINT_DIE);
	314	__raw_spin_unlock(&die_lock);
	315	raw_local_irq_restore(flags);
	316
	317	if (!regs)
	318	return;
319
320	if (kexec_should_crash(current))
321	crash_kexec(regs);
2bc5f927 AH	322	if (in_interrupt())
2bc5f927 AH	323	panic("Fatal exception in interrupt");
2bc5f927 AH	324	if (panic_on_oops)
2bc5f927 AH	325	panic("Fatal exception");
2bc5f927 AH	326	oops_exit();
	327	do_exit(signr);
	328	}
	329
	330	int __kprobes __die(const char str, struct pt_regs regs, long err)
	331	{
	332	unsigned short ss;
	333	unsigned long sp;
	334
	335	printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
	336	#ifdef CONFIG_PREEMPT
	337	printk("PREEMPT ");
	338	#endif
	339	#ifdef CONFIG_SMP
	340	printk("SMP ");
	341	#endif
	342	#ifdef CONFIG_DEBUG_PAGEALLOC
	343	printk("DEBUG_PAGEALLOC");
	344	#endif
	345	printk("\n");
	346	if (notify_die(DIE_OOPS, str, regs, err,
	347	current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
	348	return 1;
	349
	350	show_registers(regs);
	351	/* Executive summary in case the oops scrolled away */
	352	sp = (unsigned long) (&regs->sp);
	353	savesegment(ss, ss);
	354	if (user_mode(regs)) {
	355	sp = regs->sp;
	356	ss = regs->ss & 0xffff;
	357	}
	358	printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
	359	print_symbol("%s", regs->ip);
	360	printk(" SS:ESP %04x:%08lx\n", ss, sp);
	361	return 0;
	362	}
	363
	364	/*
	365	* This is gone through when something in the kernel has done something bad
	366	* and is about to be terminated:
	367	*/
	368	void die(const char str, struct pt_regs regs, long err)
	369	{
	370	unsigned long flags = oops_begin();
	371
	372	if (die_nest_count < 3) {
	373	report_bug(regs->ip, regs);
	374
	375	if (__die(str, regs, err))
	376	regs = NULL;
	377	} else {
	378	printk(KERN_EMERG "Recursive die() failure, output suppressed\n");
	379	}
	380
	381	oops_end(flags, regs, SIGSEGV);
	382	}
	383
dd6e4eba AH	384	static DEFINE_SPINLOCK(nmi_print_lock);
	385
	386	void notrace __kprobes
	387	die_nmi(char str, struct pt_regs regs, int do_panic)
	388	{
	389	if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
	390	return;
	391
	392	spin_lock(&nmi_print_lock);
	393	/*
	394	* We are in trouble anyway, lets at least try
	395	* to get a message out:
	396	*/
	397	bust_spinlocks(1);
	398	printk(KERN_EMERG "%s", str);
	399	printk(" on CPU%d, ip %08lx, registers:\n",
	400	smp_processor_id(), regs->ip);
	401	show_registers(regs);
	402	if (do_panic)
	403	panic("Non maskable interrupt");
	404	console_silent();
	405	spin_unlock(&nmi_print_lock);
	406	bust_spinlocks(0);
	407
	408	/*
	409	* If we are in kernel we are probably nested up pretty bad
	410	* and might aswell get out now while we still can:
	411	*/
	412	if (!user_mode_vm(regs)) {
	413	current->thread.trap_no = 2;
	414	crash_kexec(regs);
	415	}
	416
	417	do_exit(SIGSEGV);
	418	}
	419
802a67de AH	420	static int __init oops_setup(char *s)
	421	{
	422	if (!s)
	423	return -EINVAL;
	424	if (!strcmp(s, "panic"))
	425	panic_on_oops = 1;
	426	return 0;
	427	}
	428	early_param("oops", oops_setup);
	429
2bc5f927 AH	430	static int __init kstack_setup(char *s)
2bc5f927 AH	431	{
802a67de AH	432	if (!s)
802a67de AH	433	return -EINVAL;
2bc5f927	434	kstack_depth_to_print = simple_strtoul(s, NULL, 0);
802a67de	435	return 0;
2bc5f927	436	}
802a67de	437	early_param("kstack", kstack_setup);
2bc5f927 AH	438
	439	static int __init code_bytes_setup(char *s)
	440	{
	441	code_bytes = simple_strtoul(s, NULL, 0);
	442	if (code_bytes > 8192)
	443	code_bytes = 8192;
	444
	445	return 1;
	446	}
	447	__setup("code_bytes=", code_bytes_setup);