/* *  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); voidshow_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;}