[mirror_ubuntu-artful-kernel.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/hardirq.h>
#include <linux/kdebug.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/kexec.h>
#include <linux/sysfs.h>
#include <linux/bug.h>
#include <linux/nmi.h>

#include <asm/stacktrace.h>


void dump_trace(struct task_struct *task, struct pt_regs *regs,
		unsigned long *stack, unsigned long bp,
		const struct stacktrace_ops *ops, void *data)
{
	int graph = 0;

	if (!task)
		task = current;

	if (!stack) {
		unsigned long dummy;

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

	if (!bp)
		bp = stack_frame(task, regs);

	for (;;) {
		struct thread_info *context;

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

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

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))
			pr_cont("\n");
		pr_cont(" %08lx", *stack++);
		touch_nmi_watchdog();
	}
	pr_cont("\n");
	show_trace_log_lvl(task, regs, sp, bp, log_lvl);
}


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

	__show_regs(regs, !user_mode_vm(regs));

	pr_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;

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

		pr_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)) {
				pr_cont("  Bad EIP value.");
				break;
			}
			if (ip == (u8 *)regs->ip)
				pr_cont(" <%02x>", c);
			else
				pr_cont(" %02x", c);
		}
	}
	pr_cont("\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;
}
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>
2bc5f927 AH	8	#include <linux/hardirq.h>
	9	#include <linux/kdebug.h>
	10	#include <linux/module.h>
	11	#include <linux/ptrace.h>
	12	#include <linux/kexec.h>
b8030906	13	#include <linux/sysfs.h>
2bc5f927 AH	14	#include <linux/bug.h>
	15	#include <linux/nmi.h>
	16
	17	#include <asm/stacktrace.h>
	18
0406ca6d	19
e8e999cf NK	20	void dump_trace(struct task_struct task, struct pt_regs regs,
e8e999cf NK	21	unsigned long *stack, unsigned long bp,
2bc5f927 AH	22	const struct stacktrace_ops ops, void data)
2bc5f927 AH	23	{
7ee991fb SR	24	int graph = 0;
7ee991fb SR	25
2bc5f927 AH	26	if (!task)
	27	task = current;
	28
	29	if (!stack) {
	30	unsigned long dummy;
b8030906	31
2bc5f927	32	stack = &dummy;
8a541665	33	if (task && task != current)
2bc5f927 AH	34	stack = (unsigned long *)task->thread.sp;
	35	}
	36
e8e999cf NK	37	if (!bp)
	38	bp = stack_frame(task, regs);
	39
2bc5f927 AH	40	for (;;) {
	41	struct thread_info *context;
	42
	43	context = (struct thread_info *)
	44	((unsigned long)stack & (~(THREAD_SIZE - 1)));
61c1917f	45	bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
2ac53721	46
2bc5f927 AH	47	stack = (unsigned long *)context->previous_esp;
	48	if (!stack)
	49	break;
2ac53721 AH	50	if (ops->stack(data, "IRQ") < 0)
2ac53721 AH	51	break;
2bc5f927 AH	52	touch_nmi_watchdog();
	53	}
	54	}
	55	EXPORT_SYMBOL(dump_trace);
	56
878719e8	57	void
2bc5f927	58	show_stack_log_lvl(struct task_struct task, struct pt_regs regs,
e8e999cf	59	unsigned long sp, unsigned long bp, char log_lvl)
2bc5f927 AH	60	{
	61	unsigned long *stack;
	62	int i;
	63
	64	if (sp == NULL) {
	65	if (task)
	66	sp = (unsigned long *)task->thread.sp;
	67	else
	68	sp = (unsigned long *)&sp;
	69	}
	70
	71	stack = sp;
	72	for (i = 0; i < kstack_depth_to_print; i++) {
	73	if (kstack_end(stack))
	74	break;
8a541665	75	if (i && ((i % STACKSLOTS_PER_LINE) == 0))
c767a54b JP	76	pr_cont("\n");
c767a54b JP	77	pr_cont(" %08lx", *stack++);
ca0a8164	78	touch_nmi_watchdog();
2bc5f927	79	}
c767a54b	80	pr_cont("\n");
e8e999cf	81	show_trace_log_lvl(task, regs, sp, bp, log_lvl);
2bc5f927 AH	82	}
2bc5f927 AH	83
2bc5f927	84
57da8b96	85	void show_regs(struct pt_regs *regs)
2bc5f927 AH	86	{
	87	int i;
	88
c7e23289	89	__show_regs(regs, !user_mode_vm(regs));
2bc5f927	90
c767a54b JP	91	pr_emerg("Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
	92	TASK_COMM_LEN, current->comm, task_pid_nr(current),
	93	current_thread_info(), current, task_thread_info(current));
2bc5f927 AH	94	/*
	95	* When in-kernel, we also print out the stack and code at the
	96	* time of the fault..
	97	*/
	98	if (!user_mode_vm(regs)) {
	99	unsigned int code_prologue = code_bytes * 43 / 64;
	100	unsigned int code_len = code_bytes;
	101	unsigned char c;
	102	u8 *ip;
	103
c767a54b	104	pr_emerg("Stack:\n");
e8e999cf	105	show_stack_log_lvl(NULL, regs, &regs->sp, 0, KERN_EMERG);
2bc5f927	106
c767a54b	107	pr_emerg("Code:");
2bc5f927 AH	108
	109	ip = (u8 *)regs->ip - code_prologue;
	110	if (ip < (u8 *)PAGE_OFFSET \|\| probe_kernel_address(ip, c)) {
8a541665	111	/* try starting at IP */
2bc5f927 AH	112	ip = (u8 *)regs->ip;
	113	code_len = code_len - code_prologue + 1;
	114	}
	115	for (i = 0; i < code_len; i++, ip++) {
	116	if (ip < (u8 *)PAGE_OFFSET \|\|
	117	probe_kernel_address(ip, c)) {
c767a54b	118	pr_cont(" Bad EIP value.");
2bc5f927 AH	119	break;
	120	}
	121	if (ip == (u8 *)regs->ip)
c767a54b	122	pr_cont(" <%02x>", c);
2bc5f927	123	else
c767a54b	124	pr_cont(" %02x", c);
2bc5f927 AH	125	}
2bc5f927 AH	126	}
c767a54b	127	pr_cont("\n");
2bc5f927 AH	128	}
	129
	130	int is_valid_bugaddr(unsigned long ip)
	131	{
	132	unsigned short ud2;
	133
	134	if (ip < PAGE_OFFSET)
	135	return 0;
	136	if (probe_kernel_address((unsigned short *)ip, ud2))
	137	return 0;
	138
	139	return ud2 == 0x0b0f;
	140	}