[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / arch / x86 / kernel / dumpstack.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/ftrace.h>
#include <linux/kexec.h>
#include <linux/bug.h>
#include <linux/nmi.h>
#include <linux/sysfs.h>

#include <asm/stacktrace.h>


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

static void printk_stack_address(unsigned long address, int reliable,
				 char *log_lvl)
{
	touch_nmi_watchdog();
	printk("%s [<%p>] %s%pB\n",
		log_lvl, (void *)address, reliable ? "" : "? ",
		(void *)address);
}

void printk_address(unsigned long address)
{
	pr_cont(" [<%p>] %pS\n", (void *)address, (void *)address);
}

/*
 * 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 task_struct *task,
			void *p, unsigned int size, void *end)
{
	void *t = task_stack_page(task);
	if (end) {
		if (p < end && p >= (end-THREAD_SIZE))
			return 1;
		else
			return 0;
	}
	return p >= t && p < t + THREAD_SIZE - size;
}

unsigned long
print_context_stack(struct task_struct *task,
		unsigned long *stack, unsigned long bp,
		const struct stacktrace_ops *ops, void *data,
		unsigned long *end, int *graph)
{
	struct stack_frame *frame = (struct stack_frame *)bp;

	/*
	 * If we overflowed the stack into a guard page, jump back to the
	 * bottom of the usable stack.
	 */
	if ((unsigned long)task_stack_page(task) - (unsigned long)stack <
	    PAGE_SIZE)
		stack = (unsigned long *)task_stack_page(task);

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

		if (__kernel_text_address(addr)) {
			unsigned long real_addr;
			int reliable = 0;

			if ((unsigned long) stack == bp + sizeof(long)) {
				reliable = 1;
				frame = frame->next_frame;
				bp = (unsigned long) frame;
			}

			/*
			 * When function graph tracing is enabled for a
			 * function, its return address on the stack is
			 * replaced with the address of an ftrace handler
			 * (return_to_handler).  In that case, before printing
			 * the "real" address, we want to print the handler
			 * address as an "unreliable" hint that function graph
			 * tracing was involved.
			 */
			real_addr = ftrace_graph_ret_addr(task, graph, addr,
							  stack);
			if (real_addr != addr)
				ops->address(data, addr, 0);

			ops->address(data, real_addr, reliable);
		}
		stack++;
	}
	return bp;
}
EXPORT_SYMBOL_GPL(print_context_stack);

unsigned long
print_context_stack_bp(struct task_struct *task,
		       unsigned long *stack, unsigned long bp,
		       const struct stacktrace_ops *ops, void *data,
		       unsigned long *end, int *graph)
{
	struct stack_frame *frame = (struct stack_frame *)bp;
	unsigned long *retp = &frame->return_address;

	while (valid_stack_ptr(task, retp, sizeof(*retp), end)) {
		unsigned long addr = *retp;
		unsigned long real_addr;

		if (!__kernel_text_address(addr))
			break;

		real_addr = ftrace_graph_ret_addr(task, graph, addr, retp);
		if (ops->address(data, real_addr, 1))
			break;

		frame = frame->next_frame;
		retp = &frame->return_address;
	}

	return (unsigned long)frame;
}
EXPORT_SYMBOL_GPL(print_context_stack_bp);

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 int print_trace_address(void *data, unsigned long addr, int reliable)
{
	printk_stack_address(addr, reliable, data);
	return 0;
}

static const struct stacktrace_ops print_trace_ops = {
	.stack			= print_trace_stack,
	.address		= print_trace_address,
	.walk_stack		= print_context_stack,
};

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_stack(struct task_struct *task, unsigned long *sp)
{
	unsigned long bp = 0;

	/*
	 * Stack frames below this one aren't interesting.  Don't show them
	 * if we're printing for %current.
	 */
	if (!sp && (!task || task == current)) {
		sp = get_stack_pointer(current, NULL);
		bp = (unsigned long)get_frame_pointer(current, NULL);
	}

	show_stack_log_lvl(task, NULL, sp, bp, "");
}

void show_stack_regs(struct pt_regs *regs)
{
	show_stack_log_lvl(current, regs, NULL, 0, "");
}

static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
static int die_owner = -1;
static unsigned int die_nest_count;

unsigned 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 (!arch_spin_trylock(&die_lock)) {
		if (cpu == die_owner)
			/* nested oops. should stop eventually */;
		else
			arch_spin_lock(&die_lock);
	}
	die_nest_count++;
	die_owner = cpu;
	console_verbose();
	bust_spinlocks(1);
	return flags;
}
EXPORT_SYMBOL_GPL(oops_begin);
NOKPROBE_SYMBOL(oops_begin);

void __noreturn rewind_stack_do_exit(int signr);

void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
	if (regs && kexec_should_crash(current))
		crash_kexec(regs);

	bust_spinlocks(0);
	die_owner = -1;
	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
	die_nest_count--;
	if (!die_nest_count)
		/* Nest count reaches zero, release the lock. */
		arch_spin_unlock(&die_lock);
	raw_local_irq_restore(flags);
	oops_exit();

	if (!signr)
		return;
	if (in_interrupt())
		panic("Fatal exception in interrupt");
	if (panic_on_oops)
		panic("Fatal exception");

	/*
	 * We're not going to return, but we might be on an IST stack or
	 * have very little stack space left.  Rewind the stack and kill
	 * the task.
	 */
	rewind_stack_do_exit(signr);
}
NOKPROBE_SYMBOL(oops_end);

int __die(const char *str, struct pt_regs *regs, long err)
{
#ifdef CONFIG_X86_32
	unsigned short ss;
	unsigned long sp;
#endif
	printk(KERN_DEFAULT
	       "%s: %04lx [#%d]%s%s%s%s\n", str, err & 0xffff, ++die_counter,
	       IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT"         : "",
	       IS_ENABLED(CONFIG_SMP)     ? " SMP"             : "",
	       debug_pagealloc_enabled()  ? " DEBUG_PAGEALLOC" : "",
	       IS_ENABLED(CONFIG_KASAN)   ? " KASAN"           : "");

	if (notify_die(DIE_OOPS, str, regs, err,
			current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
		return 1;

	print_modules();
	show_regs(regs);
#ifdef CONFIG_X86_32
	if (user_mode(regs)) {
		sp = regs->sp;
		ss = regs->ss & 0xffff;
	} else {
		sp = kernel_stack_pointer(regs);
		savesegment(ss, ss);
	}
	printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
	print_symbol("%s", regs->ip);
	printk(" SS:ESP %04x:%08lx\n", ss, sp);
#else
	/* Executive summary in case the oops scrolled away */
	printk(KERN_ALERT "RIP ");
	printk_address(regs->ip);
	printk(" RSP <%016lx>\n", regs->sp);
#endif
	return 0;
}
NOKPROBE_SYMBOL(__die);

/*
 * 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();
	int sig = SIGSEGV;

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

	if (__die(str, regs, err))
		sig = 0;
	oops_end(flags, regs, sig);
}

static int __init kstack_setup(char *s)
{
	ssize_t ret;
	unsigned long val;

	if (!s)
		return -EINVAL;

	ret = kstrtoul(s, 0, &val);
	if (ret)
		return ret;
	kstack_depth_to_print = val;
	return 0;
}
early_param("kstack", kstack_setup);

static int __init code_bytes_setup(char *s)
{
	ssize_t ret;
	unsigned long val;

	if (!s)
		return -EINVAL;

	ret = kstrtoul(s, 0, &val);
	if (ret)
		return ret;

	code_bytes = val;
	if (code_bytes > 8192)
		code_bytes = 8192;

	return 1;
}
__setup("code_bytes=", code_bytes_setup);
Commit	Line	Data
878719e8 NH	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>
712406a6	13	#include <linux/ftrace.h>
878719e8 NH	14	#include <linux/kexec.h>
	15	#include <linux/bug.h>
	16	#include <linux/nmi.h>
	17	#include <linux/sysfs.h>
	18
	19	#include <asm/stacktrace.h>
	20
878719e8 NH	21
878719e8 NH	22	int panic_on_unrecovered_nmi;
5211a242	23	int panic_on_io_nmi;
878719e8 NH	24	unsigned int code_bytes = 64;
	25	int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
	26	static int die_counter;
	27
1fc7f61c	28	static void printk_stack_address(unsigned long address, int reliable,
d438f5fd	29	char *log_lvl)
878719e8	30	{
d438f5fd	31	touch_nmi_watchdog();
1fc7f61c	32	printk("%s [<%p>] %s%pB\n",
d438f5fd	33	log_lvl, (void *)address, reliable ? "" : "? ",
1fc7f61c	34	(void *)address);
878719e8 NH	35	}
878719e8 NH	36
5f01c988 JS	37	void printk_address(unsigned long address)
	38	{
	39	pr_cont(" [<%p>] %pS\n", (void )address, (void )address);
	40	}
	41
878719e8 NH	42	/*
	43	* x86-64 can have up to three kernel stacks:
	44	* process stack
	45	* interrupt stack
	46	* severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
	47	*/
	48
da01e18a	49	static inline int valid_stack_ptr(struct task_struct *task,
878719e8 NH	50	void p, unsigned int size, void end)
878719e8 NH	51	{
aca9c293	52	void *t = task_stack_page(task);
878719e8 NH	53	if (end) {
	54	if (p < end && p >= (end-THREAD_SIZE))
	55	return 1;
	56	else
	57	return 0;
	58	}
9a2e9da3	59	return p >= t && p < t + THREAD_SIZE - size;
878719e8 NH	60	}
	61
	62	unsigned long
da01e18a	63	print_context_stack(struct task_struct *task,
878719e8 NH	64	unsigned long *stack, unsigned long bp,
878719e8 NH	65	const struct stacktrace_ops ops, void data,
7ee991fb	66	unsigned long end, int graph)
878719e8 NH	67	{
	68	struct stack_frame frame = (struct stack_frame )bp;
	69
9a2e9da3 AL	70	/*
	71	* If we overflowed the stack into a guard page, jump back to the
	72	* bottom of the usable stack.
	73	*/
	74	if ((unsigned long)task_stack_page(task) - (unsigned long)stack <
	75	PAGE_SIZE)
	76	stack = (unsigned long *)task_stack_page(task);
	77
da01e18a	78	while (valid_stack_ptr(task, stack, sizeof(*stack), end)) {
408fe5de	79	unsigned long addr = *stack;
878719e8	80
878719e8	81	if (__kernel_text_address(addr)) {
408fe5de JP	82	unsigned long real_addr;
	83	int reliable = 0;
	84
878719e8	85	if ((unsigned long) stack == bp + sizeof(long)) {
408fe5de	86	reliable = 1;
878719e8 NH	87	frame = frame->next_frame;
878719e8 NH	88	bp = (unsigned long) frame;
878719e8	89	}
408fe5de	90
6f727b84 JP	91	/*
	92	* When function graph tracing is enabled for a
	93	* function, its return address on the stack is
	94	* replaced with the address of an ftrace handler
	95	* (return_to_handler). In that case, before printing
	96	* the "real" address, we want to print the handler
	97	* address as an "unreliable" hint that function graph
	98	* tracing was involved.
	99	*/
408fe5de JP	100	real_addr = ftrace_graph_ret_addr(task, graph, addr,
	101	stack);
	102	if (real_addr != addr)
6f727b84 JP	103	ops->address(data, addr, 0);
	104
	105	ops->address(data, real_addr, reliable);
878719e8 NH	106	}
	107	stack++;
	108	}
	109	return bp;
	110	}
06d65bda FW	111	EXPORT_SYMBOL_GPL(print_context_stack);
	112
	113	unsigned long
da01e18a	114	print_context_stack_bp(struct task_struct *task,
06d65bda FW	115	unsigned long *stack, unsigned long bp,
	116	const struct stacktrace_ops ops, void data,
	117	unsigned long end, int graph)
	118	{
	119	struct stack_frame frame = (struct stack_frame )bp;
408fe5de	120	unsigned long *retp = &frame->return_address;
06d65bda	121
408fe5de JP	122	while (valid_stack_ptr(task, retp, sizeof(*retp), end)) {
	123	unsigned long addr = *retp;
	124	unsigned long real_addr;
06d65bda	125
c2c5d45d FW	126	if (!__kernel_text_address(addr))
	127	break;
	128
408fe5de	129	real_addr = ftrace_graph_ret_addr(task, graph, addr, retp);
6f727b84 JP	130	if (ops->address(data, real_addr, 1))
6f727b84 JP	131	break;
408fe5de	132
c2c5d45d	133	frame = frame->next_frame;
408fe5de	134	retp = &frame->return_address;
06d65bda	135	}
c2c5d45d	136
06d65bda FW	137	return (unsigned long)frame;
	138	}
	139	EXPORT_SYMBOL_GPL(print_context_stack_bp);
878719e8	140
878719e8 NH	141	static int print_trace_stack(void data, char name)
	142	{
	143	printk("%s <%s> ", (char *)data, name);
	144	return 0;
	145	}
	146
	147	/*
	148	* Print one address/symbol entries per line.
	149	*/
568b329a	150	static int print_trace_address(void *data, unsigned long addr, int reliable)
878719e8	151	{
1fc7f61c	152	printk_stack_address(addr, reliable, data);
568b329a	153	return 0;
878719e8 NH	154	}
	155
	156	static const struct stacktrace_ops print_trace_ops = {
06d65bda FW	157	.stack = print_trace_stack,
06d65bda FW	158	.address = print_trace_address,
61c1917f	159	.walk_stack = print_context_stack,
878719e8 NH	160	};
	161
	162	void
	163	show_trace_log_lvl(struct task_struct task, struct pt_regs regs,
e8e999cf	164	unsigned long stack, unsigned long bp, char log_lvl)
878719e8 NH	165	{
878719e8 NH	166	printk("%sCall Trace:\n", log_lvl);
e8e999cf	167	dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
878719e8 NH	168	}
878719e8 NH	169
878719e8 NH	170	void show_stack(struct task_struct task, unsigned long sp)
878719e8 NH	171	{
a77f2a4e	172	unsigned long bp = 0;
a77f2a4e TH	173
	174	/*
	175	* Stack frames below this one aren't interesting. Don't show them
	176	* if we're printing for %current.
	177	*/
	178	if (!sp && (!task \|\| task == current)) {
4b8afafb JP	179	sp = get_stack_pointer(current, NULL);
4b8afafb JP	180	bp = (unsigned long)get_frame_pointer(current, NULL);
a77f2a4e TH	181	}
	182
	183	show_stack_log_lvl(task, NULL, sp, bp, "");
878719e8 NH	184	}
878719e8 NH	185
81c2949f BP	186	void show_stack_regs(struct pt_regs *regs)
81c2949f BP	187	{
5a8ff54c	188	show_stack_log_lvl(current, regs, NULL, 0, "");
81c2949f BP	189	}
81c2949f BP	190
edc35bd7	191	static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
878719e8 NH	192	static int die_owner = -1;
	193	static unsigned int die_nest_count;
	194
9326638c	195	unsigned long oops_begin(void)
878719e8 NH	196	{
	197	int cpu;
	198	unsigned long flags;
	199
	200	oops_enter();
	201
	202	/* racy, but better than risking deadlock. */
	203	raw_local_irq_save(flags);
	204	cpu = smp_processor_id();
0199c4e6	205	if (!arch_spin_trylock(&die_lock)) {
878719e8 NH	206	if (cpu == die_owner)
	207	/* nested oops. should stop eventually */;
	208	else
0199c4e6	209	arch_spin_lock(&die_lock);
878719e8 NH	210	}
	211	die_nest_count++;
	212	die_owner = cpu;
	213	console_verbose();
	214	bust_spinlocks(1);
	215	return flags;
	216	}
81e88fdc	217	EXPORT_SYMBOL_GPL(oops_begin);
9326638c	218	NOKPROBE_SYMBOL(oops_begin);
878719e8	219
2deb4be2 AL	220	void __noreturn rewind_stack_do_exit(int signr);
2deb4be2 AL	221
9326638c	222	void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
878719e8 NH	223	{
	224	if (regs && kexec_should_crash(current))
	225	crash_kexec(regs);
	226
	227	bust_spinlocks(0);
	228	die_owner = -1;
373d4d09	229	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
878719e8 NH	230	die_nest_count--;
	231	if (!die_nest_count)
	232	/* Nest count reaches zero, release the lock. */
0199c4e6	233	arch_spin_unlock(&die_lock);
878719e8 NH	234	raw_local_irq_restore(flags);
	235	oops_exit();
	236
	237	if (!signr)
	238	return;
	239	if (in_interrupt())
	240	panic("Fatal exception in interrupt");
	241	if (panic_on_oops)
	242	panic("Fatal exception");
2deb4be2 AL	243
	244	/*
	245	* We're not going to return, but we might be on an IST stack or
	246	* have very little stack space left. Rewind the stack and kill
	247	* the task.
	248	*/
	249	rewind_stack_do_exit(signr);
878719e8	250	}
9326638c	251	NOKPROBE_SYMBOL(oops_end);
878719e8	252
9326638c	253	int __die(const char str, struct pt_regs regs, long err)
878719e8 NH	254	{
	255	#ifdef CONFIG_X86_32
	256	unsigned short ss;
	257	unsigned long sp;
	258	#endif
b0f4c4b3	259	printk(KERN_DEFAULT
8fad7ec5 RV	260	"%s: %04lx [#%d]%s%s%s%s\n", str, err & 0xffff, ++die_counter,
	261	IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "",
	262	IS_ENABLED(CONFIG_SMP) ? " SMP" : "",
	263	debug_pagealloc_enabled() ? " DEBUG_PAGEALLOC" : "",
	264	IS_ENABLED(CONFIG_KASAN) ? " KASAN" : "");
	265
878719e8	266	if (notify_die(DIE_OOPS, str, regs, err,
51e7dc70	267	current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
878719e8 NH	268	return 1;
878719e8 NH	269
0fa0e2f0	270	print_modules();
57da8b96	271	show_regs(regs);
878719e8	272	#ifdef CONFIG_X86_32
f39b6f0e	273	if (user_mode(regs)) {
878719e8 NH	274	sp = regs->sp;
878719e8 NH	275	ss = regs->ss & 0xffff;
a343c75d PA	276	} else {
	277	sp = kernel_stack_pointer(regs);
	278	savesegment(ss, ss);
878719e8 NH	279	}
	280	printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
	281	print_symbol("%s", regs->ip);
	282	printk(" SS:ESP %04x:%08lx\n", ss, sp);
	283	#else
	284	/* Executive summary in case the oops scrolled away */
	285	printk(KERN_ALERT "RIP ");
5f01c988	286	printk_address(regs->ip);
878719e8 NH	287	printk(" RSP <%016lx>\n", regs->sp);
	288	#endif
	289	return 0;
	290	}
9326638c	291	NOKPROBE_SYMBOL(__die);
878719e8 NH	292
	293	/*
	294	* This is gone through when something in the kernel has done something bad
	295	* and is about to be terminated:
	296	*/
	297	void die(const char str, struct pt_regs regs, long err)
	298	{
	299	unsigned long flags = oops_begin();
	300	int sig = SIGSEGV;
	301
f39b6f0e	302	if (!user_mode(regs))
878719e8 NH	303	report_bug(regs->ip, regs);
	304
	305	if (__die(str, regs, err))
	306	sig = 0;
	307	oops_end(flags, regs, sig);
	308	}
	309
878719e8 NH	310	static int __init kstack_setup(char *s)
878719e8 NH	311	{
363f7ce3 SK	312	ssize_t ret;
	313	unsigned long val;
	314
878719e8 NH	315	if (!s)
878719e8 NH	316	return -EINVAL;
363f7ce3 SK	317
	318	ret = kstrtoul(s, 0, &val);
	319	if (ret)
	320	return ret;
	321	kstack_depth_to_print = val;
878719e8 NH	322	return 0;
	323	}
	324	early_param("kstack", kstack_setup);
	325
	326	static int __init code_bytes_setup(char *s)
	327	{
363f7ce3 SK	328	ssize_t ret;
	329	unsigned long val;
	330
	331	if (!s)
	332	return -EINVAL;
	333
	334	ret = kstrtoul(s, 0, &val);
	335	if (ret)
	336	return ret;
	337
	338	code_bytes = val;
878719e8 NH	339	if (code_bytes > 8192)
	340	code_bytes = 8192;
	341
	342	return 1;
	343	}
	344	__setup("code_bytes=", code_bytes_setup);