arch/h8300/kernel/traps.c

   1 /*
   2  * linux/arch/h8300/boot/traps.c -- general exception handling code
   3  * H8/300 support Yoshinori Sato <ysato@users.sourceforge.jp>
   4  *
   5  * Cloned from Linux/m68k.
   6  *
   7  * No original Copyright holder listed,
   8  * Probable original (C) Roman Zippel (assigned DJD, 1999)
   9  *
  10  * Copyright 1999-2000 D. Jeff Dionne, <jeff@rt-control.com>
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/sched.h>
  19 #include <linux/kernel.h>
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/bug.h>
  24
  25 #include <asm/irq.h>
  26 #include <asm/traps.h>
  27 #include <asm/page.h>
  28
  29 static DEFINE_SPINLOCK(die_lock);
  30
  31 /*
  32  * this must be called very early as the kernel might
  33  * use some instruction that are emulated on the 060
  34  */
  35
  36 void __init base_trap_init(void)
  37 {
  38 }
  39
  40 void __init trap_init (void)
  41 {
  42 }
  43
  44 asmlinkage void set_esp0 (unsigned long ssp)
  45 {
  46         current->thread.esp0 = ssp;
  47 }
  48
  49 /*
  50  *      Generic dumping code. Used for panic and debug.
  51  */
  52
  53 static void dump(struct pt_regs *fp)
  54 {
  55         unsigned long   *sp;
  56         unsigned char   *tp;
  57         int             i;
  58
  59         printk("\nCURRENT PROCESS:\n\n");
  60         printk("COMM=%s PID=%d\n", current->comm, current->pid);
  61         if (current->mm) {
  62                 printk("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
  63                         (int) current->mm->start_code,
  64                         (int) current->mm->end_code,
  65                         (int) current->mm->start_data,
  66                         (int) current->mm->end_data,
  67                         (int) current->mm->end_data,
  68                         (int) current->mm->brk);
  69                 printk("USER-STACK=%08x  KERNEL-STACK=%08lx\n\n",
  70                         (int) current->mm->start_stack,
  71                         (int) PAGE_SIZE+(unsigned long)current);
  72         }
  73
  74         show_regs(fp);
  75         printk("\nCODE:");
  76         tp = ((unsigned char *) fp->pc) - 0x20;
  77         for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {
  78                 if ((i % 0x10) == 0)
  79                         printk("\n%08x: ", (int) (tp + i));
  80                 printk("%08x ", (int) *sp++);
  81         }
  82         printk("\n");
  83
  84         printk("\nKERNEL STACK:");
  85         tp = ((unsigned char *) fp) - 0x40;
  86         for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
  87                 if ((i % 0x10) == 0)
  88                         printk("\n%08x: ", (int) (tp + i));
  89                 printk("%08x ", (int) *sp++);
  90         }
  91         printk("\n");
  92         if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE))
  93                 printk("(Possibly corrupted stack page??)\n");
  94
  95         printk("\n\n");
  96 }
  97
  98 void die(const char *str, struct pt_regs *fp, unsigned long err)
  99 {
 100         static int diecount;
 101
 102         oops_enter();
 103
 104         console_verbose();
 105         spin_lock_irq(&die_lock);
 106         report_bug(fp->pc, fp);
 107         printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++diecount);
 108         dump(fp);
 109
 110         spin_unlock_irq(&die_lock);
 111         do_exit(SIGSEGV);
 112 }
 113
 114 extern char _start, _etext;
 115 #define check_kernel_text(addr) \
 116         ((addr >= (unsigned long)(&_start)) && \
 117          (addr <  (unsigned long)(&_etext)))
 118
 119 static int kstack_depth_to_print = 24;
 120
 121 void show_stack(struct task_struct *task, unsigned long *esp)
 122 {
 123         unsigned long *stack,  addr;
 124         int i;
 125
 126         if (esp == NULL)
 127                 esp = (unsigned long *) &esp;
 128
 129         stack = esp;
 130
 131         printk("Stack from %08lx:", (unsigned long)stack);
 132         for (i = 0; i < kstack_depth_to_print; i++) {
 133                 if (((unsigned long)stack & (THREAD_SIZE - 1)) == 0)
 134                         break;
 135                 if (i % 8 == 0)
 136                         printk("\n       ");
 137                 printk(" %08lx", *stack++);
 138         }
 139
 140         printk("\nCall Trace:");
 141         i = 0;
 142         stack = esp;
 143         while (((unsigned long)stack & (THREAD_SIZE - 1)) != 0) {
 144                 addr = *stack++;
 145                 /*
 146                  * If the address is either in the text segment of the
 147                  * kernel, or in the region which contains vmalloc'ed
 148                  * memory, it *may* be the address of a calling
 149                  * routine; if so, print it so that someone tracing
 150                  * down the cause of the crash will be able to figure
 151                  * out the call path that was taken.
 152                  */
 153                 if (check_kernel_text(addr)) {
 154                         if (i % 4 == 0)
 155                                 printk("\n       ");
 156                         printk(" [<%08lx>]", addr);
 157                         i++;
 158                 }
 159         }
 160         printk("\n");
 161 }
 162
 163 void show_trace_task(struct task_struct *tsk)
 164 {
 165         show_stack(tsk,(unsigned long *)tsk->thread.esp0);
 166 }
 167
 168 void dump_stack(void)
 169 {
 170         show_stack(NULL,NULL);
 171 }
 172
 173 EXPORT_SYMBOL(dump_stack);