[deliverable/linux.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;
	u32 *prev_esp;

	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);

		/* Stop if not on irq stack */
		if (task_stack_page(task) == context)
			break;

		/* The previous esp is just above the context */
		prev_esp = (u32 *) ((char *)context + sizeof(struct thread_info) -
				    sizeof(long));
		stack = (unsigned long *)*prev_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_print_info(KERN_EMERG);
	__show_regs(regs, !user_mode_vm(regs));

	/*
	 * 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	24	int graph = 0;
0788aa6a	25	u32 *prev_esp;
7ee991fb	26
2bc5f927 AH	27	if (!task)
	28	task = current;
	29
	30	if (!stack) {
	31	unsigned long dummy;
b8030906	32
2bc5f927	33	stack = &dummy;
8a541665	34	if (task && task != current)
2bc5f927 AH	35	stack = (unsigned long *)task->thread.sp;
	36	}
	37
e8e999cf NK	38	if (!bp)
	39	bp = stack_frame(task, regs);
	40
2bc5f927 AH	41	for (;;) {
	42	struct thread_info *context;
	43
	44	context = (struct thread_info *)
	45	((unsigned long)stack & (~(THREAD_SIZE - 1)));
61c1917f	46	bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
2ac53721	47
0788aa6a SR	48	/* Stop if not on irq stack */
	49	if (task_stack_page(task) == context)
	50	break;
	51
	52	/* The previous esp is just above the context */
	53	prev_esp = (u32 ) ((char )context + sizeof(struct thread_info) -
	54	sizeof(long));
	55	stack = (unsigned long )prev_esp;
2bc5f927 AH	56	if (!stack)
2bc5f927 AH	57	break;
0788aa6a	58
2ac53721 AH	59	if (ops->stack(data, "IRQ") < 0)
2ac53721 AH	60	break;
2bc5f927 AH	61	touch_nmi_watchdog();
	62	}
	63	}
	64	EXPORT_SYMBOL(dump_trace);
	65
878719e8	66	void
2bc5f927	67	show_stack_log_lvl(struct task_struct task, struct pt_regs regs,
e8e999cf	68	unsigned long sp, unsigned long bp, char log_lvl)
2bc5f927 AH	69	{
	70	unsigned long *stack;
	71	int i;
	72
	73	if (sp == NULL) {
	74	if (task)
	75	sp = (unsigned long *)task->thread.sp;
	76	else
	77	sp = (unsigned long *)&sp;
	78	}
	79
	80	stack = sp;
	81	for (i = 0; i < kstack_depth_to_print; i++) {
	82	if (kstack_end(stack))
	83	break;
8a541665	84	if (i && ((i % STACKSLOTS_PER_LINE) == 0))
c767a54b JP	85	pr_cont("\n");
c767a54b JP	86	pr_cont(" %08lx", *stack++);
ca0a8164	87	touch_nmi_watchdog();
2bc5f927	88	}
c767a54b	89	pr_cont("\n");
e8e999cf	90	show_trace_log_lvl(task, regs, sp, bp, log_lvl);
2bc5f927 AH	91	}
2bc5f927 AH	92
2bc5f927	93
57da8b96	94	void show_regs(struct pt_regs *regs)
2bc5f927 AH	95	{
	96	int i;
	97
a43cb95d	98	show_regs_print_info(KERN_EMERG);
c7e23289	99	__show_regs(regs, !user_mode_vm(regs));
2bc5f927	100
2bc5f927 AH	101	/*
	102	* When in-kernel, we also print out the stack and code at the
	103	* time of the fault..
	104	*/
	105	if (!user_mode_vm(regs)) {
	106	unsigned int code_prologue = code_bytes * 43 / 64;
	107	unsigned int code_len = code_bytes;
	108	unsigned char c;
	109	u8 *ip;
	110
c767a54b	111	pr_emerg("Stack:\n");
e8e999cf	112	show_stack_log_lvl(NULL, regs, &regs->sp, 0, KERN_EMERG);
2bc5f927	113
c767a54b	114	pr_emerg("Code:");
2bc5f927 AH	115
	116	ip = (u8 *)regs->ip - code_prologue;
	117	if (ip < (u8 *)PAGE_OFFSET \|\| probe_kernel_address(ip, c)) {
8a541665	118	/* try starting at IP */
2bc5f927 AH	119	ip = (u8 *)regs->ip;
	120	code_len = code_len - code_prologue + 1;
	121	}
	122	for (i = 0; i < code_len; i++, ip++) {
	123	if (ip < (u8 *)PAGE_OFFSET \|\|
	124	probe_kernel_address(ip, c)) {
c767a54b	125	pr_cont(" Bad EIP value.");
2bc5f927 AH	126	break;
	127	}
	128	if (ip == (u8 *)regs->ip)
c767a54b	129	pr_cont(" <%02x>", c);
2bc5f927	130	else
c767a54b	131	pr_cont(" %02x", c);
2bc5f927 AH	132	}
2bc5f927 AH	133	}
c767a54b	134	pr_cont("\n");
2bc5f927 AH	135	}
	136
	137	int is_valid_bugaddr(unsigned long ip)
	138	{
	139	unsigned short ud2;
	140
	141	if (ip < PAGE_OFFSET)
	142	return 0;
	143	if (probe_kernel_address((unsigned short *)ip, ud2))
	144	return 0;
	145
	146	return ud2 == 0x0b0f;
	147	}