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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/kernel/dumpstack_32.c
10817 views
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/*

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 *  Copyright (C) 1991, 1992  Linus Torvalds

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 *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs

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 */

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#include <linux/kallsyms.h>

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#include <linux/kprobes.h>

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#include <linux/uaccess.h>

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#include <linux/hardirq.h>

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#include <linux/kdebug.h>

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#include <linux/module.h>

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#include <linux/ptrace.h>

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#include <linux/kexec.h>

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#include <linux/sysfs.h>

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#include <linux/bug.h>

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#include <linux/nmi.h>

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#include <asm/stacktrace.h>

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void dump_trace(struct task_struct *task, struct pt_regs *regs,

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		unsigned long *stack, unsigned long bp,

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		const struct stacktrace_ops *ops, void *data)

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{

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	int graph = 0;

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	if (!task)

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		task = current;

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	if (!stack) {

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		unsigned long dummy;

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		stack = &dummy;

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		if (task && task != current)

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			stack = (unsigned long *)task->thread.sp;

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	}

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	if (!bp)

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		bp = stack_frame(task, regs);

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	for (;;) {

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		struct thread_info *context;

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		context = (struct thread_info *)

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			((unsigned long)stack & (~(THREAD_SIZE - 1)));

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		bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);

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		stack = (unsigned long *)context->previous_esp;

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		if (!stack)

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			break;

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		if (ops->stack(data, "IRQ") < 0)

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			break;

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		touch_nmi_watchdog();

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	}

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}

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EXPORT_SYMBOL(dump_trace);

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void

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show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,

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		   unsigned long *sp, unsigned long bp, char *log_lvl)

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{

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	unsigned long *stack;

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	int i;

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	if (sp == NULL) {

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		if (task)

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			sp = (unsigned long *)task->thread.sp;

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		else

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			sp = (unsigned long *)&sp;

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	}

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	stack = sp;

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	for (i = 0; i < kstack_depth_to_print; i++) {

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		if (kstack_end(stack))

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			break;

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		if (i && ((i % STACKSLOTS_PER_LINE) == 0))

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			printk(KERN_CONT "\n");

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		printk(KERN_CONT " %08lx", *stack++);

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		touch_nmi_watchdog();

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	}

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	printk(KERN_CONT "\n");

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	show_trace_log_lvl(task, regs, sp, bp, log_lvl);

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}

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void show_registers(struct pt_regs *regs)

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{

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	int i;

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	print_modules();

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	__show_regs(regs, 0);

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	printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",

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		TASK_COMM_LEN, current->comm, task_pid_nr(current),

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		current_thread_info(), current, task_thread_info(current));

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	/*

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	 * When in-kernel, we also print out the stack and code at the

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	 * time of the fault..

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	 */

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	if (!user_mode_vm(regs)) {

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		unsigned int code_prologue = code_bytes * 43 / 64;

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		unsigned int code_len = code_bytes;

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		unsigned char c;

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		u8 *ip;

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		printk(KERN_EMERG "Stack:\n");

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		show_stack_log_lvl(NULL, regs, &regs->sp, 0, KERN_EMERG);

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		printk(KERN_EMERG "Code: ");

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		ip = (u8 *)regs->ip - code_prologue;

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		if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {

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			/* try starting at IP */

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			ip = (u8 *)regs->ip;

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			code_len = code_len - code_prologue + 1;

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		}

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		for (i = 0; i < code_len; i++, ip++) {

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			if (ip < (u8 *)PAGE_OFFSET ||

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					probe_kernel_address(ip, c)) {

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				printk(" Bad EIP value.");

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				break;

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			}

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			if (ip == (u8 *)regs->ip)

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				printk("<%02x> ", c);

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			else

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				printk("%02x ", c);

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		}

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	}

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	printk("\n");

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}

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int is_valid_bugaddr(unsigned long ip)

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{

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	unsigned short ud2;

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	if (ip < PAGE_OFFSET)

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		return 0;

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	if (probe_kernel_address((unsigned short *)ip, ud2))

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		return 0;

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	return ud2 == 0x0b0f;

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}

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