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traps.c

/*
 * linux/arch/h8300/boot/traps.c -- general exception handling code
 * H8/300 support Yoshinori Sato <ysato@users.sourceforge.jp>
 * 
 * Cloned from Linux/m68k.
 *
 * No original Copyright holder listed,
 * Probable original (C) Roman Zippel (assigned DJD, 1999)
 *
 * Copyright 1999-2000 D. Jeff Dionne, <jeff@rt-control.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/bug.h>

#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/page.h>

static DEFINE_SPINLOCK(die_lock);

/*
 * this must be called very early as the kernel might
 * use some instruction that are emulated on the 060
 */

void __init base_trap_init(void)
{
}

void __init trap_init (void)
{
}

asmlinkage void set_esp0 (unsigned long ssp)
{
      current->thread.esp0 = ssp;
}

/*
 *    Generic dumping code. Used for panic and debug.
 */

static void dump(struct pt_regs *fp)
{
      unsigned long     *sp;
      unsigned char     *tp;
      int         i;

      printk("\nCURRENT PROCESS:\n\n");
      printk("COMM=%s PID=%d\n", current->comm, current->pid);
      if (current->mm) {
            printk("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
                  (int) current->mm->start_code,
                  (int) current->mm->end_code,
                  (int) current->mm->start_data,
                  (int) current->mm->end_data,
                  (int) current->mm->end_data,
                  (int) current->mm->brk);
            printk("USER-STACK=%08x  KERNEL-STACK=%08lx\n\n",
                  (int) current->mm->start_stack,
                  (int) PAGE_SIZE+(unsigned long)current);
      }

      show_regs(fp);
      printk("\nCODE:");
      tp = ((unsigned char *) fp->pc) - 0x20;
      for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {
            if ((i % 0x10) == 0)
                  printk("\n%08x: ", (int) (tp + i));
            printk("%08x ", (int) *sp++);
      }
      printk("\n");

      printk("\nKERNEL STACK:");
      tp = ((unsigned char *) fp) - 0x40;
      for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
            if ((i % 0x10) == 0)
                  printk("\n%08x: ", (int) (tp + i));
            printk("%08x ", (int) *sp++);
      }
      printk("\n");
      if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE))
                printk("(Possibly corrupted stack page??)\n");

      printk("\n\n");
}

void die(char *str, struct pt_regs *fp, unsigned long err)
{
      static int diecount;

      oops_enter();

      console_verbose();
      spin_lock_irq(&die_lock);
      report_bug(fp->pc, fp);
      printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++diecount);
      dump(fp);

      spin_unlock_irq(&die_lock);
      do_exit(SIGSEGV);
}

extern char _start, _etext;
#define check_kernel_text(addr) \
        ((addr >= (unsigned long)(&_start)) && \
         (addr <  (unsigned long)(&_etext))) 

static int kstack_depth_to_print = 24;

void show_stack(struct task_struct *task, unsigned long *esp)
{
      unsigned long *stack,  addr;
      int i;

      if (esp == NULL)
            esp = (unsigned long *) &esp;

      stack = esp;

      printk("Stack from %08lx:", (unsigned long)stack);
      for (i = 0; i < kstack_depth_to_print; i++) {
            if (((unsigned long)stack & (THREAD_SIZE - 1)) == 0)
                  break;
            if (i % 8 == 0)
                  printk("\n       ");
            printk(" %08lx", *stack++);
      }

      printk("\nCall Trace:");
      i = 0;
      stack = esp;
      while (((unsigned long)stack & (THREAD_SIZE - 1)) != 0) {
            addr = *stack++;
            /*
             * If the address is either in the text segment of the
             * kernel, or in the region which contains vmalloc'ed
             * memory, it *may* be the address of a calling
             * routine; if so, print it so that someone tracing
             * down the cause of the crash will be able to figure
             * out the call path that was taken.
             */
            if (check_kernel_text(addr)) {
                  if (i % 4 == 0)
                        printk("\n       ");
                  printk(" [<%08lx>]", addr);
                  i++;
            }
      }
      printk("\n");
}

void show_trace_task(struct task_struct *tsk)
{
      show_stack(tsk,(unsigned long *)tsk->thread.esp0);
}

void dump_stack(void)
{
      show_stack(NULL,NULL);
}

EXPORT_SYMBOL(dump_stack);

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