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
  20 void trap_init(void)
  21 {
  22         __enable_hw_exceptions();
  23 }
  24
  25 static unsigned long kstack_depth_to_print = 24;
  26
  27 static int __init kstack_setup(char *s)
  28 {
  29         return !strict_strtoul(s, 0, &kstack_depth_to_print);
  30 }
  31 __setup("kstack=", kstack_setup);
  32
  33 void 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
  65 void 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
  93 void dump_stack(void)
  94 {
  95         show_stack(NULL, NULL);
  96 }
  97 EXPORT_SYMBOL(dump_stack);