[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/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>

#include "dumpstack.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;
	}

#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, &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))
			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_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;
}
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>
ae87221d	16	#include <linux/sysfs.h>
2bc5f927 AH	17
	18	#include <asm/stacktrace.h>
	19
878719e8	20	#include "dumpstack.h"
2bc5f927 AH	21
	22	void dump_trace(struct task_struct task, struct pt_regs regs,
	23	unsigned long *stack, unsigned long bp,
	24	const struct stacktrace_ops ops, void data)
	25	{
7ee991fb SR	26	int graph = 0;
7ee991fb SR	27
2bc5f927 AH	28	if (!task)
	29	task = current;
	30
	31	if (!stack) {
	32	unsigned long dummy;
	33	stack = &dummy;
8a541665	34	if (task && task != current)
2bc5f927 AH	35	stack = (unsigned long *)task->thread.sp;
	36	}
	37
	38	#ifdef CONFIG_FRAME_POINTER
	39	if (!bp) {
	40	if (task == current) {
	41	/* Grab bp right from our regs */
8a541665	42	get_bp(bp);
2bc5f927 AH	43	} else {
	44	/* bp is the last reg pushed by switch_to */
	45	bp = (unsigned long ) task->thread.sp;
	46	}
	47	}
	48	#endif
	49
	50	for (;;) {
	51	struct thread_info *context;
	52
	53	context = (struct thread_info *)
	54	((unsigned long)stack & (~(THREAD_SIZE - 1)));
7ee991fb SR	55	bp = print_context_stack(context, stack, bp, ops,
7ee991fb SR	56	data, NULL, &graph);
2ac53721	57
2bc5f927 AH	58	stack = (unsigned long *)context->previous_esp;
	59	if (!stack)
	60	break;
2ac53721 AH	61	if (ops->stack(data, "IRQ") < 0)
2ac53721 AH	62	break;
2bc5f927 AH	63	touch_nmi_watchdog();
	64	}
	65	}
	66	EXPORT_SYMBOL(dump_trace);
	67
878719e8	68	void
2bc5f927	69	show_stack_log_lvl(struct task_struct task, struct pt_regs regs,
8a541665	70	unsigned long sp, unsigned long bp, char log_lvl)
2bc5f927 AH	71	{
	72	unsigned long *stack;
	73	int i;
	74
	75	if (sp == NULL) {
	76	if (task)
	77	sp = (unsigned long *)task->thread.sp;
	78	else
	79	sp = (unsigned long *)&sp;
	80	}
	81
	82	stack = sp;
	83	for (i = 0; i < kstack_depth_to_print; i++) {
	84	if (kstack_end(stack))
	85	break;
8a541665	86	if (i && ((i % STACKSLOTS_PER_LINE) == 0))
ca0a8164 AH	87	printk("\n%s", log_lvl);
	88	printk(" %08lx", *stack++);
	89	touch_nmi_watchdog();
2bc5f927	90	}
ca0a8164	91	printk("\n");
2bc5f927 AH	92	show_trace_log_lvl(task, regs, sp, bp, log_lvl);
	93	}
	94
2bc5f927 AH	95
	96	void show_registers(struct pt_regs *regs)
	97	{
	98	int i;
	99
	100	print_modules();
	101	__show_regs(regs, 0);
	102
ca0a8164	103	printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
2bc5f927 AH	104	TASK_COMM_LEN, current->comm, task_pid_nr(current),
	105	current_thread_info(), current, task_thread_info(current));
	106	/*
	107	* When in-kernel, we also print out the stack and code at the
	108	* time of the fault..
	109	*/
	110	if (!user_mode_vm(regs)) {
	111	unsigned int code_prologue = code_bytes * 43 / 64;
	112	unsigned int code_len = code_bytes;
	113	unsigned char c;
	114	u8 *ip;
	115
ca0a8164 AH	116	printk(KERN_EMERG "Stack:\n");
	117	show_stack_log_lvl(NULL, regs, &regs->sp,
	118	0, KERN_EMERG);
2bc5f927 AH	119
	120	printk(KERN_EMERG "Code: ");
	121
	122	ip = (u8 *)regs->ip - code_prologue;
	123	if (ip < (u8 *)PAGE_OFFSET \|\| probe_kernel_address(ip, c)) {
8a541665	124	/* try starting at IP */
2bc5f927 AH	125	ip = (u8 *)regs->ip;
	126	code_len = code_len - code_prologue + 1;
	127	}
	128	for (i = 0; i < code_len; i++, ip++) {
	129	if (ip < (u8 *)PAGE_OFFSET \|\|
	130	probe_kernel_address(ip, c)) {
	131	printk(" Bad EIP value.");
	132	break;
	133	}
	134	if (ip == (u8 *)regs->ip)
	135	printk("<%02x> ", c);
	136	else
	137	printk("%02x ", c);
	138	}
	139	}
	140	printk("\n");
	141	}
	142
	143	int is_valid_bugaddr(unsigned long ip)
	144	{
	145	unsigned short ud2;
	146
	147	if (ip < PAGE_OFFSET)
	148	return 0;
	149	if (probe_kernel_address((unsigned short *)ip, ud2))
	150	return 0;
	151
	152	return ud2 == 0x0b0f;
	153	}
	154