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/system.h>
  26 #include <asm/irq.h>
  27 #include <asm/traps.h>
  28 #include <asm/page.h>
  29
  30 static DEFINE_SPINLOCK(die_lock);
  31
  32 /*
  33  * this must be called very early as the kernel might
  34  * use some instruction that are emulated on the 060
  35  */
  36
  37 void __init base_trap_init(void)
  38 {
  39 }
  40
  41 void __init trap_init (void)
  42 {
  43 }
  44
  45 asmlinkage void set_esp0 (unsigned long ssp)
  46 {
  47         current->thread.esp0 = ssp;
  48 }
  49
  50 /*
  51  *      Generic dumping code. Used for panic and debug.
  52  */
  53
  54 static void dump(struct pt_regs *fp)
  55 {
  56         unsigned long   *sp;
  57         unsigned char   *tp;
  58         int             i;
  59
  60         printk("\nCURRENT PROCESS:\n\n");
  61         printk("COMM=%s PID=%d\n", current->comm, current->pid);
  62         if (current->mm) {
  63                 printk("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
  64                         (int) current->mm->start_code,
  65                         (int) current->mm->end_code,
  66                         (int) current->mm->start_data,
  67                         (int) current->mm->end_data,
  68                         (int) current->mm->end_data,
  69                         (int) current->mm->brk);
  70                 printk("USER-STACK=%08x  KERNEL-STACK=%08lx\n\n",
  71                         (int) current->mm->start_stack,
  72                         (int) PAGE_SIZE+(unsigned long)current);
  73         }
  74
  75         show_regs(fp);
  76         printk("\nCODE:");
  77         tp = ((unsigned char *) fp->pc) - 0x20;
  78         for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {
  79                 if ((i % 0x10) == 0)
  80                         printk("\n%08x: ", (int) (tp + i));
  81                 printk("%08x ", (int) *sp++);
  82         }
  83         printk("\n");
  84
  85         printk("\nKERNEL STACK:");
  86         tp = ((unsigned char *) fp) - 0x40;
  87         for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
  88                 if ((i % 0x10) == 0)
  89                         printk("\n%08x: ", (int) (tp + i));
  90                 printk("%08x ", (int) *sp++);
  91         }
  92         printk("\n");
  93         if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE))
  94                 printk("(Possibly corrupted stack page??)\n");
  95
  96         printk("\n\n");
  97 }
  98
  99 void die(char *str, struct pt_regs *fp, unsigned long err)
 100 {
 101         static int diecount;
 102
 103         oops_enter();
 104
 105         console_verbose();
 106         spin_lock_irq(&die_lock);
 107         report_bug(fp->pc, fp);
 108         printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++diecount);
 109         dump(fp);
 110
 111         spin_unlock_irq(&die_lock);
 112         do_exit(SIGSEGV);
 113 }
 114
 115 extern char _start, _etext;
 116 #define check_kernel_text(addr) \
 117         ((addr >= (unsigned long)(&_start)) && \
 118          (addr <  (unsigned long)(&_etext)))
 119
 120 static int kstack_depth_to_print = 24;
 121
 122 void show_stack(struct task_struct *task, unsigned long *esp)
 123 {
 124         unsigned long *stack,  addr;
 125         int i;
 126
 127         if (esp == NULL)
 128                 esp = (unsigned long *) &esp;
 129
 130         stack = esp;
 131
 132         printk("Stack from %08lx:", (unsigned long)stack);
 133         for (i = 0; i < kstack_depth_to_print; i++) {
 134                 if (((unsigned long)stack & (THREAD_SIZE - 1)) == 0)
 135                         break;
 136                 if (i % 8 == 0)
 137                         printk("\n       ");
 138                 printk(" %08lx", *stack++);
 139         }
 140
 141         printk("\nCall Trace:");
 142         i = 0;
 143         stack = esp;
 144         while (((unsigned long)stack & (THREAD_SIZE - 1)) != 0) {
 145                 addr = *stack++;
 146                 /*
 147                  * If the address is either in the text segment of the
 148                  * kernel, or in the region which contains vmalloc'ed
 149                  * memory, it *may* be the address of a calling
 150                  * routine; if so, print it so that someone tracing
 151                  * down the cause of the crash will be able to figure
 152                  * out the call path that was taken.
 153                  */
 154                 if (check_kernel_text(addr)) {
 155                         if (i % 4 == 0)
 156                                 printk("\n       ");
 157                         printk(" [<%08lx>]", addr);
 158                         i++;
 159                 }
 160         }
 161         printk("\n");
 162 }
 163
 164 void show_trace_task(struct task_struct *tsk)
 165 {
 166         show_stack(tsk,(unsigned long *)tsk->thread.esp0);
 167 }
 168
 169 void dump_stack(void)
 170 {
 171         show_stack(NULL,NULL);
 172 }
 173
 174 EXPORT_SYMBOL(dump_stack);