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 int kstack_depth_to_print = 24;
  26
  27 static int __init kstack_setup(char *s)
  28 {
  29         kstack_depth_to_print = strict_strtoul(s, 0, NULL);
  30
  31         return 1;
  32 }
  33 __setup("kstack=", kstack_setup);
  34
  35 void show_trace(struct task_struct *task, unsigned long *stack)
  36 {
  37         unsigned long addr;
  38
  39         if (!stack)
  40                 stack = (unsigned long *)&stack;
  41
  42         printk(KERN_NOTICE "Call Trace: ");
  43 #ifdef CONFIG_KALLSYMS
  44         printk(KERN_NOTICE "\n");
  45 #endif
  46         while (!kstack_end(stack)) {
  47                 addr = *stack++;
  48                 /*
  49                  * If the address is either in the text segment of the
  50                  * kernel, or in the region which contains vmalloc'ed
  51                  * memory, it *may* be the address of a calling
  52                  * routine; if so, print it so that someone tracing
  53                  * down the cause of the crash will be able to figure
  54                  * out the call path that was taken.
  55                  */
  56                 if (kernel_text_address(addr))
  57                         print_ip_sym(addr);
  58         }
  59         printk(KERN_NOTICE "\n");
  60
  61         if (!task)
  62                 task = current;
  63
  64         debug_show_held_locks(task);
  65 }
  66
  67 void show_stack(struct task_struct *task, unsigned long *sp)
  68 {
  69         unsigned long *stack;
  70         int i;
  71
  72         if (sp == NULL) {
  73                 if (task)
  74                         sp = (unsigned long *) ((struct thread_info *)
  75                                                 (task->stack))->cpu_context.r1;
  76                 else
  77                         sp = (unsigned long *)&sp;
  78         }
  79
  80         stack = sp;
  81
  82         printk(KERN_INFO "\nStack:\n  ");
  83
  84         for (i = 0; i < kstack_depth_to_print; i++) {
  85                 if (kstack_end(sp))
  86                         break;
  87                 if (i && ((i % 8) == 0))
  88                         printk("\n  ");
  89                 printk("%08lx ", *sp++);
  90         }
  91         printk("\n");
  92         show_trace(task, stack);
  93 }
  94
  95 void dump_stack(void)
  96 {
  97         show_stack(NULL, NULL);
  98 }
  99 EXPORT_SYMBOL(dump_stack);
 100
 101 #ifdef CONFIG_MMU
 102 void __bug(const char *file, int line, void *data)
 103 {
 104         if (data)
 105                 printk(KERN_CRIT "kernel BUG at %s:%d (data = %p)!\n",
 106                         file, line, data);
 107         else
 108                 printk(KERN_CRIT "kernel BUG at %s:%d!\n", file, line);
 109
 110         machine_halt();
 111 }
 112
 113 int bad_trap(int trap_num, struct pt_regs *regs)
 114 {
 115         printk(KERN_CRIT
 116                 "unimplemented trap %d called at 0x%08lx, pid %d!\n",
 117                 trap_num, regs->pc, current->pid);
 118         return -ENOSYS;
 119 }
 120
 121 int debug_trap(struct pt_regs *regs)
 122 {
 123         int i;
 124         printk(KERN_CRIT "debug trap\n");
 125         for (i = 0; i < 32; i++) {
 126                 /* printk("r%i:%08X\t",i,regs->gpr[i]); */
 127                 if ((i % 4) == 3)
 128                         printk(KERN_CRIT "\n");
 129         }
 130         printk(KERN_CRIT "pc:%08lX\tmsr:%08lX\n", regs->pc, regs->msr);
 131         return -ENOSYS;
 132 }
 133 #endif