arch/x86/kernel/dumpstack_64.c - android_kernel_htc_msm8960 - Gitiles

 /*
  *  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 <linux/sysfs.h>

 #include <asm/stacktrace.h>

 #define STACKSLOTS_PER_LINE 4
 #define get_bp(bp) asm("movq %%rbp, %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 unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
 					unsigned *usedp, char **idp)
 {
 	static char ids[][8] = {
 		[DEBUG_STACK - 1] = "#DB",
 		[NMI_STACK - 1] = "NMI",
 		[DOUBLEFAULT_STACK - 1] = "#DF",
 		[STACKFAULT_STACK - 1] = "#SS",
 		[MCE_STACK - 1] = "#MC",
 #if DEBUG_STKSZ > EXCEPTION_STKSZ
 		[N_EXCEPTION_STACKS ...
 			N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
 #endif
 	};
 	unsigned k;

 	/*
 	 * Iterate over all exception stacks, and figure out whether
 	 * 'stack' is in one of them:
 	 */
 	for (k = 0; k < N_EXCEPTION_STACKS; k++) {
 		unsigned long end = per_cpu(orig_ist, cpu).ist[k];
 		/*
 		 * Is 'stack' above this exception frame's end?
 		 * If yes then skip to the next frame.
 		 */
 		if (stack >= end)
 			continue;
 		/*
 		 * Is 'stack' above this exception frame's start address?
 		 * If yes then we found the right frame.
 		 */
 		if (stack >= end - EXCEPTION_STKSZ) {
 			/*
 			 * Make sure we only iterate through an exception
 			 * stack once. If it comes up for the second time
 			 * then there's something wrong going on - just
 			 * break out and return NULL:
 			 */
 			if (*usedp & (1U << k))
 				break;
 			*usedp |= 1U << k;
 			*idp = ids[k];
 			return (unsigned long *)end;
 		}
 		/*
 		 * If this is a debug stack, and if it has a larger size than
 		 * the usual exception stacks, then 'stack' might still
 		 * be within the lower portion of the debug stack:
 		 */
 #if DEBUG_STKSZ > EXCEPTION_STKSZ
 		if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
 			unsigned j = N_EXCEPTION_STACKS - 1;

 			/*
 			 * Black magic. A large debug stack is composed of
 			 * multiple exception stack entries, which we
 			 * iterate through now. Dont look:
 			 */
 			do {
 				++j;
 				end -= EXCEPTION_STKSZ;
 				ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
 			} while (stack < end - EXCEPTION_STKSZ);
 			if (*usedp & (1U << j))
 				break;
 			*usedp |= 1U << j;
 			*idp = ids[j];
 			return (unsigned long *)end;
 		}
 #endif
 	}
 	return NULL;
 }

 /*
  * x86-64 can have up to three kernel stacks:
  * process stack
  * interrupt stack
  * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
  */

 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)
 {
 	const unsigned cpu = get_cpu();
 	unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
 	unsigned used = 0;
 	struct thread_info *tinfo;

 	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

 	/*
 	 * Print function call entries in all stacks, starting at the
 	 * current stack address. If the stacks consist of nested
 	 * exceptions
 	 */
 	tinfo = task_thread_info(task);
 	for (;;) {
 		char *id;
 		unsigned long *estack_end;
 		estack_end = in_exception_stack(cpu, (unsigned long)stack,
 						&used, &id);

 		if (estack_end) {
 			if (ops->stack(data, id) < 0)
 				break;

 			bp = print_context_stack(tinfo, stack, bp, ops,
 							data, estack_end);
 			ops->stack(data, "<EOE>");
 			/*
 			 * We link to the next stack via the
 			 * second-to-last pointer (index -2 to end) in the
 			 * exception stack:
 			 */
 			stack = (unsigned long *) estack_end[-2];
 			continue;
 		}
 		if (irqstack_end) {
 			unsigned long *irqstack;
 			irqstack = irqstack_end -
 				(IRQSTACKSIZE - 64) / sizeof(*irqstack);

 			if (stack >= irqstack && stack < irqstack_end) {
 				if (ops->stack(data, "IRQ") < 0)
 					break;
 				bp = print_context_stack(tinfo, stack, bp,
 						ops, data, irqstack_end);
 				/*
 				 * We link to the next stack (which would be
 				 * the process stack normally) the last
 				 * pointer (index -1 to end) in the IRQ stack:
 				 */
 				stack = (unsigned long *) (irqstack_end[-1]);
 				irqstack_end = NULL;
 				ops->stack(data, "EOI");
 				continue;
 			}
 		}
 		break;
 	}

 	/*
 	 * This handles the process stack:
 	 */
 	bp = print_context_stack(tinfo, stack, bp, ops, data, NULL);
 	put_cpu();
 }
 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;
 	const int cpu = smp_processor_id();
 	unsigned long *irqstack_end =
 		(unsigned long *) (cpu_pda(cpu)->irqstackptr);
 	unsigned long *irqstack =
 		(unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);

 	/*
 	 * debugging aid: "show_stack(NULL, NULL);" prints the
 	 * back trace for this cpu.
 	 */

 	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 (stack >= irqstack && stack <= irqstack_end) {
 			if (stack == irqstack_end) {
 				stack = (unsigned long *) (irqstack_end[-1]);
 				printk(" <EOI> ");
 			}
 		} else {
 		if (((long) stack & (THREAD_SIZE-1)) == 0)
 			break;
 		}
 		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
 			printk("\n%s", log_lvl);
 		printk(" %016lx", *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;
 	unsigned long sp;
 	const int cpu = smp_processor_id();
 	struct task_struct *cur = cpu_pda(cpu)->pcurrent;

 	sp = regs->sp;
 	printk("CPU %d ", cpu);
 	__show_regs(regs, 1);
 	printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
 		cur->comm, cur->pid, task_thread_info(cur), cur);

 	/*
 	 * When in-kernel, we also print out the stack and code at the
 	 * time of the fault..
 	 */
 	if (!user_mode(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, (unsigned long *)sp,
 				regs->bp, 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 RIP 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 (__copy_from_user(&ud2, (const void __user *) ip, sizeof(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)
 {
 	int cpu;
 	unsigned long flags;

 	oops_enter();

 	/* racy, but better than risking deadlock. */
 	raw_local_irq_save(flags);
 	cpu = smp_processor_id();
 	if (!__raw_spin_trylock(&die_lock)) {
 		if (cpu == die_owner)
 			/* nested oops. should stop eventually */;
 		else
 			__raw_spin_lock(&die_lock);
 	}
 	die_nest_count++;
 	die_owner = cpu;
 	console_verbose();
 	bust_spinlocks(1);
 	return flags;
 }

 void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
 {
 	die_owner = -1;
 	bust_spinlocks(0);
 	die_nest_count--;
 	if (!die_nest_count)
 		/* Nest count reaches zero, release the lock. */
 		__raw_spin_unlock(&die_lock);
 	raw_local_irq_restore(flags);
 	if (!regs) {
 		oops_exit();
 		return;
 	}
 	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)
 {
 	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");
 	sysfs_printk_last_file();
 	if (notify_die(DIE_OOPS, str, regs, err,
 			current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
 		return 1;

 	show_registers(regs);
 	add_taint(TAINT_DIE);
 	/* Executive summary in case the oops scrolled away */
 	printk(KERN_ALERT "RIP ");
 	printk_address(regs->ip, 1);
 	printk(" RSP <%016lx>\n", regs->sp);
 	if (kexec_should_crash(current))
 		crash_kexec(regs);
 	return 0;
 }

 void die(const char *str, struct pt_regs *regs, long err)
 {
 	unsigned long flags = oops_begin();

 	if (!user_mode(regs))
 		report_bug(regs->ip, regs);

 	if (__die(str, regs, err))
 		regs = NULL;
 	oops_end(flags, regs, SIGSEGV);
 }

 notrace __kprobes void
 die_nmi(char *str, struct pt_regs *regs, int do_panic)
 {
 	unsigned long flags;

 	if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
 		return;

 	flags = oops_begin();
 	/*
 	 * We are in trouble anyway, lets at least try
 	 * to get a message out.
 	 */
 	printk(KERN_EMERG "%s", str);
 	printk(" on CPU%d, ip %08lx, registers:\n",
 		smp_processor_id(), regs->ip);
 	show_registers(regs);
 	if (kexec_should_crash(current))
 		crash_kexec(regs);
 	if (do_panic || panic_on_oops)
 		panic("Non maskable interrupt");
 	oops_end(flags, NULL, SIGBUS);
 	nmi_exit();
 	local_irq_enable();
 	do_exit(SIGBUS);
 }

 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);
	/*
	* 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 <linux/sysfs.h>

	#include <asm/stacktrace.h>

	#define STACKSLOTS_PER_LINE 4
	#define get_bp(bp) asm("movq %%rbp, %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 unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
	unsigned usedp, char *idp)
	{
	static char ids[][8] = {
	[DEBUG_STACK - 1] = "#DB",
	[NMI_STACK - 1] = "NMI",
	[DOUBLEFAULT_STACK - 1] = "#DF",
	[STACKFAULT_STACK - 1] = "#SS",
	[MCE_STACK - 1] = "#MC",
	#if DEBUG_STKSZ > EXCEPTION_STKSZ
	[N_EXCEPTION_STACKS ...
	N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
	#endif
	};
	unsigned k;

	/*
	* Iterate over all exception stacks, and figure out whether
	* 'stack' is in one of them:
	*/
	for (k = 0; k < N_EXCEPTION_STACKS; k++) {
	unsigned long end = per_cpu(orig_ist, cpu).ist[k];
	/*
	* Is 'stack' above this exception frame's end?
	* If yes then skip to the next frame.
	*/
	if (stack >= end)
	continue;
	/*
	* Is 'stack' above this exception frame's start address?
	* If yes then we found the right frame.
	*/
	if (stack >= end - EXCEPTION_STKSZ) {
	/*
	* Make sure we only iterate through an exception
	* stack once. If it comes up for the second time
	* then there's something wrong going on - just
	* break out and return NULL:
	*/
	if (*usedp & (1U << k))
	break;
	*usedp \|= 1U << k;
	*idp = ids[k];
	return (unsigned long *)end;
	}
	/*
	* If this is a debug stack, and if it has a larger size than
	* the usual exception stacks, then 'stack' might still
	* be within the lower portion of the debug stack:
	*/
	#if DEBUG_STKSZ > EXCEPTION_STKSZ
	if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
	unsigned j = N_EXCEPTION_STACKS - 1;

	/*
	* Black magic. A large debug stack is composed of
	* multiple exception stack entries, which we
	* iterate through now. Dont look:
	*/
	do {
	++j;
	end -= EXCEPTION_STKSZ;
	ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
	} while (stack < end - EXCEPTION_STKSZ);
	if (*usedp & (1U << j))
	break;
	*usedp \|= 1U << j;
	*idp = ids[j];
	return (unsigned long *)end;
	}
	#endif
	}
	return NULL;
	}

	/*
	* x86-64 can have up to three kernel stacks:
	* process stack
	* interrupt stack
	* severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
	*/

	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)
	{
	const unsigned cpu = get_cpu();
	unsigned long irqstack_end = (unsigned long )cpu_pda(cpu)->irqstackptr;
	unsigned used = 0;
	struct thread_info *tinfo;

	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

	/*
	* Print function call entries in all stacks, starting at the
	* current stack address. If the stacks consist of nested
	* exceptions
	*/
	tinfo = task_thread_info(task);
	for (;;) {
	char *id;
	unsigned long *estack_end;
	estack_end = in_exception_stack(cpu, (unsigned long)stack,
	&used, &id);

	if (estack_end) {
	if (ops->stack(data, id) < 0)
	break;

	bp = print_context_stack(tinfo, stack, bp, ops,
	data, estack_end);
	ops->stack(data, "<EOE>");
	/*
	* We link to the next stack via the
	* second-to-last pointer (index -2 to end) in the
	* exception stack:
	*/
	stack = (unsigned long *) estack_end[-2];
	continue;
	}
	if (irqstack_end) {
	unsigned long *irqstack;
	irqstack = irqstack_end -
	(IRQSTACKSIZE - 64) / sizeof(*irqstack);

	if (stack >= irqstack && stack < irqstack_end) {
	if (ops->stack(data, "IRQ") < 0)
	break;
	bp = print_context_stack(tinfo, stack, bp,
	ops, data, irqstack_end);
	/*
	* We link to the next stack (which would be
	* the process stack normally) the last
	* pointer (index -1 to end) in the IRQ stack:
	*/
	stack = (unsigned long *) (irqstack_end[-1]);
	irqstack_end = NULL;
	ops->stack(data, "EOI");
	continue;
	}
	}
	break;
	}

	/*
	* This handles the process stack:
	*/
	bp = print_context_stack(tinfo, stack, bp, ops, data, NULL);
	put_cpu();
	}
	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;
	const int cpu = smp_processor_id();
	unsigned long *irqstack_end =
	(unsigned long *) (cpu_pda(cpu)->irqstackptr);
	unsigned long *irqstack =
	(unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);

	/*
	* debugging aid: "show_stack(NULL, NULL);" prints the
	* back trace for this cpu.
	*/

	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 (stack >= irqstack && stack <= irqstack_end) {
	if (stack == irqstack_end) {
	stack = (unsigned long *) (irqstack_end[-1]);
	printk(" <EOI> ");
	}
	} else {
	if (((long) stack & (THREAD_SIZE-1)) == 0)
	break;
	}
	if (i && ((i % STACKSLOTS_PER_LINE) == 0))
	printk("\n%s", log_lvl);
	printk(" %016lx", *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;
	unsigned long sp;
	const int cpu = smp_processor_id();
	struct task_struct *cur = cpu_pda(cpu)->pcurrent;

	sp = regs->sp;
	printk("CPU %d ", cpu);
	__show_regs(regs, 1);
	printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
	cur->comm, cur->pid, task_thread_info(cur), cur);

	/*
	* When in-kernel, we also print out the stack and code at the
	* time of the fault..
	*/
	if (!user_mode(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, (unsigned long *)sp,
	regs->bp, 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 RIP 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 (__copy_from_user(&ud2, (const void __user *) ip, sizeof(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)
	{
	int cpu;
	unsigned long flags;

	oops_enter();

	/* racy, but better than risking deadlock. */
	raw_local_irq_save(flags);
	cpu = smp_processor_id();
	if (!__raw_spin_trylock(&die_lock)) {
	if (cpu == die_owner)
	/* nested oops. should stop eventually */;
	else
	__raw_spin_lock(&die_lock);
	}
	die_nest_count++;
	die_owner = cpu;
	console_verbose();
	bust_spinlocks(1);
	return flags;
	}

	void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
	{
	die_owner = -1;
	bust_spinlocks(0);
	die_nest_count--;
	if (!die_nest_count)
	/* Nest count reaches zero, release the lock. */
	__raw_spin_unlock(&die_lock);
	raw_local_irq_restore(flags);
	if (!regs) {
	oops_exit();
	return;
	}
	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)
	{
	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");
	sysfs_printk_last_file();
	if (notify_die(DIE_OOPS, str, regs, err,
	current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
	return 1;

	show_registers(regs);
	add_taint(TAINT_DIE);
	/* Executive summary in case the oops scrolled away */
	printk(KERN_ALERT "RIP ");
	printk_address(regs->ip, 1);
	printk(" RSP <%016lx>\n", regs->sp);
	if (kexec_should_crash(current))
	crash_kexec(regs);
	return 0;
	}

	void die(const char str, struct pt_regs regs, long err)
	{
	unsigned long flags = oops_begin();

	if (!user_mode(regs))
	report_bug(regs->ip, regs);

	if (__die(str, regs, err))
	regs = NULL;
	oops_end(flags, regs, SIGSEGV);
	}

	notrace __kprobes void
	die_nmi(char str, struct pt_regs regs, int do_panic)
	{
	unsigned long flags;

	if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
	return;

	flags = oops_begin();
	/*
	* We are in trouble anyway, lets at least try
	* to get a message out.
	*/
	printk(KERN_EMERG "%s", str);
	printk(" on CPU%d, ip %08lx, registers:\n",
	smp_processor_id(), regs->ip);
	show_registers(regs);
	if (kexec_should_crash(current))
	crash_kexec(regs);
	if (do_panic \|\| panic_on_oops)
	panic("Non maskable interrupt");
	oops_end(flags, NULL, SIGBUS);
	nmi_exit();
	local_irq_enable();
	do_exit(SIGBUS);
	}

	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);