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 void __bad_xchg(volatile void *ptr, int size)
  26 {
  27         printk(KERN_INFO "xchg: bad data size: pc 0x%p, ptr 0x%p, size %d\n",
  28                 __builtin_return_address(0), ptr, size);
  29         BUG();
  30 }
  31 EXPORT_SYMBOL(__bad_xchg);
  32
  33 static int kstack_depth_to_print = 24;
  34
  35 static int __init kstack_setup(char *s)
  36 {
  37         kstack_depth_to_print = strict_strtoul(s, 0, 0);
  38
  39         return 1;
  40 }
  41 __setup("kstack=", kstack_setup);
  42
  43 void show_trace(struct task_struct *task, unsigned long *stack)
  44 {
  45         unsigned long addr;
  46
  47         if (!stack)
  48                 stack = (unsigned long *)&stack;
  49
  50         printk(KERN_NOTICE "Call Trace: ");
  51 #ifdef CONFIG_KALLSYMS
  52         printk(KERN_NOTICE "\n");
  53 #endif
  54         while (!kstack_end(stack)) {
  55                 addr = *stack++;
  56                 /*
  57                  * If the address is either in the text segment of the
  58                  * kernel, or in the region which contains vmalloc'ed
  59                  * memory, it *may* be the address of a calling
  60                  * routine; if so, print it so that someone tracing
  61                  * down the cause of the crash will be able to figure
  62                  * out the call path that was taken.
  63                  */
  64                 if (kernel_text_address(addr))
  65                         print_ip_sym(addr);
  66         }
  67         printk(KERN_NOTICE "\n");
  68
  69         if (!task)
  70                 task = current;
  71
  72         debug_show_held_locks(task);
  73 }
  74
  75 void show_stack(struct task_struct *task, unsigned long *sp)
  76 {
  77         unsigned long *stack;
  78         int i;
  79
  80         if (sp == NULL) {
  81                 if (task)
  82                         sp = (unsigned long *) ((struct thread_info *)
  83                                                 (task->stack))->cpu_context.r1;
  84                 else
  85                         sp = (unsigned long *)&sp;
  86         }
  87
  88         stack = sp;
  89
  90         printk(KERN_INFO "\nStack:\n  ");
  91
  92         for (i = 0; i < kstack_depth_to_print; i++) {
  93                 if (kstack_end(sp))
  94                         break;
  95                 if (i && ((i % 8) == 0))
  96                         printk("\n  ");
  97                 printk("%08lx ", *sp++);
  98         }
  99         printk("\n");
 100         show_trace(task, stack);
 101 }
 102
 103 void dump_stack(void)
 104 {
 105         show_stack(NULL, NULL);
 106 }
 107 EXPORT_SYMBOL(dump_stack);