arch/cris/kernel/traps.c

   1 /* $Id: traps.c,v 1.11 2005/01/24 16:03:19 orjanf Exp $
   2  *
   3  *  linux/arch/cris/traps.c
   4  *
   5  *  Here we handle the break vectors not used by the system call
   6  *  mechanism, as well as some general stack/register dumping
   7  *  things.
   8  *
   9  *  Copyright (C) 2000-2002 Axis Communications AB
  10  *
  11  *  Authors:   Bjorn Wesen
  12  *             Hans-Peter Nilsson
  13  *
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <asm/pgtable.h>
  19 #include <asm/uaccess.h>
  20
  21 static int kstack_depth_to_print = 24;
  22
  23 extern int raw_printk(const char *fmt, ...);
  24
  25 void show_trace(unsigned long * stack)
  26 {
  27         unsigned long addr, module_start, module_end;
  28         extern char _stext, _etext;
  29         int i;
  30
  31         raw_printk("\nCall Trace: ");
  32
  33         i = 1;
  34         module_start = VMALLOC_START;
  35         module_end = VMALLOC_END;
  36
  37         while (((long) stack & (THREAD_SIZE-1)) != 0) {
  38                 if (__get_user (addr, stack)) {
  39                         /* This message matches "failing address" marked
  40                            s390 in ksymoops, so lines containing it will
  41                            not be filtered out by ksymoops.  */
  42                         raw_printk ("Failing address 0x%lx\n", (unsigned long)stack);
  43                         break;
  44                 }
  45                 stack++;
  46
  47                 /*
  48                  * If the address is either in the text segment of the
  49                  * kernel, or in the region which contains vmalloc'ed
  50                  * memory, it *may* be the address of a calling
  51                  * routine; if so, print it so that someone tracing
  52                  * down the cause of the crash will be able to figure
  53                  * out the call path that was taken.
  54                  */
  55                 if (((addr >= (unsigned long) &_stext) &&
  56                      (addr <= (unsigned long) &_etext)) ||
  57                     ((addr >= module_start) && (addr <= module_end))) {
  58                         if (i && ((i % 8) == 0))
  59                                 raw_printk("\n       ");
  60                         raw_printk("[<%08lx>] ", addr);
  61                         i++;
  62                 }
  63         }
  64 }
  65
  66 /*
  67  * These constants are for searching for possible module text
  68  * segments. MODULE_RANGE is a guess of how much space is likely
  69  * to be vmalloced.
  70  */
  71
  72 #define MODULE_RANGE (8*1024*1024)
  73
  74 /*
  75  * The output (format, strings and order) is adjusted to be usable with
  76  * ksymoops-2.4.1 with some necessary CRIS-specific patches.  Please don't
  77  * change it unless you're serious about adjusting ksymoops and syncing
  78  * with the ksymoops maintainer.
  79  */
  80
  81 void
  82 show_stack(struct task_struct *task, unsigned long *sp)
  83 {
  84         unsigned long *stack, addr;
  85         int i;
  86
  87         /*
  88          * debugging aid: "show_stack(NULL);" prints a
  89          * back trace.
  90          */
  91
  92         if(sp == NULL) {
  93                 if (task)
  94                         sp = (unsigned long*)task->thread.ksp;
  95                 else
  96                         sp = (unsigned long*)rdsp();
  97         }
  98
  99         stack = sp;
 100
 101         raw_printk("\nStack from %08lx:\n       ", (unsigned long)stack);
 102         for(i = 0; i < kstack_depth_to_print; i++) {
 103                 if (((long) stack & (THREAD_SIZE-1)) == 0)
 104                         break;
 105                 if (i && ((i % 8) == 0))
 106                         raw_printk("\n       ");
 107                 if (__get_user (addr, stack)) {
 108                         /* This message matches "failing address" marked
 109                            s390 in ksymoops, so lines containing it will
 110                            not be filtered out by ksymoops.  */
 111                         raw_printk ("Failing address 0x%lx\n", (unsigned long)stack);
 112                         break;
 113                 }
 114                 stack++;
 115                 raw_printk("%08lx ", addr);
 116         }
 117         show_trace(sp);
 118 }
 119
 120 static void (*nmi_handler)(struct pt_regs*);
 121 extern void arch_enable_nmi(void);
 122
 123 void set_nmi_handler(void (*handler)(struct pt_regs*))
 124 {
 125   nmi_handler = handler;
 126   arch_enable_nmi();
 127 }
 128
 129 void handle_nmi(struct pt_regs* regs)
 130 {
 131   if (nmi_handler)
 132     nmi_handler(regs);
 133 }
 134
 135 #ifdef CONFIG_DEBUG_NMI_OOPS
 136 void oops_nmi_handler(struct pt_regs* regs)
 137 {
 138   stop_watchdog();
 139   raw_printk("NMI!\n");
 140   show_registers(regs);
 141 }
 142
 143 static int
 144 __init oops_nmi_register(void)
 145 {
 146   set_nmi_handler(oops_nmi_handler);
 147   return 0;
 148 }
 149
 150 __initcall(oops_nmi_register);
 151
 152 #endif
 153
 154 #if 0
 155 /* displays a short stack trace */
 156
 157 int
 158 show_stack()
 159 {
 160         unsigned long *sp = (unsigned long *)rdusp();
 161         int i;
 162         raw_printk("Stack dump [0x%08lx]:\n", (unsigned long)sp);
 163         for(i = 0; i < 16; i++)
 164                 raw_printk("sp + %d: 0x%08lx\n", i*4, sp[i]);
 165         return 0;
 166 }
 167 #endif
 168
 169 void dump_stack(void)
 170 {
 171         show_stack(NULL, NULL);
 172 }
 173
 174 EXPORT_SYMBOL(dump_stack);
 175
 176 void __init
 177 trap_init(void)
 178 {
 179         /* Nothing needs to be done */
 180 }
 181
 182 void spinning_cpu(void* addr)
 183 {
 184   raw_printk("CPU %d spinning on %X\n", smp_processor_id(), addr);
 185   dump_stack();
 186 }