LXR linux/arch/microblaze/kernel/traps.c

   1/*
   2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3 * Copyright (C) 2007-2009 PetaLogix
   4 * Copyright (C) 2006 Atmark Techno, Inc.
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License. See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/kallsyms.h>
  13#include <linux/module.h>
  14#include <linux/sched.h>
  15#include <linux/debug_locks.h>
  16
  17#include <asm/exceptions.h>
  18#include <asm/system.h>
  19
  20void trap_init(void)
  21{
  22        __enable_hw_exceptions();
  23}
  24
  25static unsigned long kstack_depth_to_print = 24;
  26
  27static int __init kstack_setup(char *s)
  28{
  29        return !strict_strtoul(s, 0, &kstack_depth_to_print);
  30}
  31__setup("kstack=", kstack_setup);
  32
  33void show_trace(struct task_struct *task, unsigned long *stack)
  34{
  35        unsigned long addr;
  36
  37        if (!stack)
  38                stack = (unsigned long *)&stack;
  39
  40        printk(KERN_NOTICE "Call Trace: ");
  41#ifdef CONFIG_KALLSYMS
  42        printk(KERN_NOTICE "\n");
  43#endif
  44        while (!kstack_end(stack)) {
  45                addr = *stack++;
  46                /*
  47                 * If the address is either in the text segment of the
  48                 * kernel, or in the region which contains vmalloc'ed
  49                 * memory, it *may* be the address of a calling
  50                 * routine; if so, print it so that someone tracing
  51                 * down the cause of the crash will be able to figure
  52                 * out the call path that was taken.
  53                 */
  54                if (kernel_text_address(addr))
  55                        print_ip_sym(addr);
  56        }
  57        printk(KERN_NOTICE "\n");
  58
  59        if (!task)
  60                task = current;
  61
  62        debug_show_held_locks(task);
  63}
  64
  65void show_stack(struct task_struct *task, unsigned long *sp)
  66{
  67        unsigned long *stack;
  68        int i;
  69
  70        if (sp == NULL) {
  71                if (task)
  72                        sp = (unsigned long *) ((struct thread_info *)
  73                                                (task->stack))->cpu_context.r1;
  74                else
  75                        sp = (unsigned long *)&sp;
  76        }
  77
  78        stack = sp;
  79
  80        printk(KERN_INFO "\nStack:\n  ");
  81
  82        for (i = 0; i < kstack_depth_to_print; i++) {
  83                if (kstack_end(sp))
  84                        break;
  85                if (i && ((i % 8) == 0))
  86                        printk("\n  ");
  87                printk("%08lx ", *sp++);
  88        }
  89        printk("\n");
  90        show_trace(task, stack);
  91}
  92
  93void dump_stack(void)
  94{
  95        show_stack(NULL, NULL);
  96}
  97EXPORT_SYMBOL(dump_stack);
  98