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traps.c

/*
 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2007-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * 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/kernel.h>
#include <linux/kallsyms.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/debug_locks.h>

#include <asm/exceptions.h>
#include <asm/system.h>

void trap_init(void)
{
      __enable_hw_exceptions();
}

static int kstack_depth_to_print = 24;

static int __init kstack_setup(char *s)
{
      kstack_depth_to_print = strict_strtoul(s, 0, NULL);

      return 1;
}
__setup("kstack=", kstack_setup);

void show_trace(struct task_struct *task, unsigned long *stack)
{
      unsigned long addr;

      if (!stack)
            stack = (unsigned long *)&stack;

      printk(KERN_NOTICE "Call Trace: ");
#ifdef CONFIG_KALLSYMS
      printk(KERN_NOTICE "\n");
#endif
      while (!kstack_end(stack)) {
            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 (kernel_text_address(addr))
                  print_ip_sym(addr);
      }
      printk(KERN_NOTICE "\n");

      if (!task)
            task = current;

      debug_show_held_locks(task);
}

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

      if (sp == NULL) {
            if (task)
                  sp = (unsigned long *) ((struct thread_info *)
                                    (task->stack))->cpu_context.r1;
            else
                  sp = (unsigned long *)&sp;
      }

      stack = sp;

      printk(KERN_INFO "\nStack:\n  ");

      for (i = 0; i < kstack_depth_to_print; i++) {
            if (kstack_end(sp))
                  break;
            if (i && ((i % 8) == 0))
                  printk("\n  ");
            printk("%08lx ", *sp++);
      }
      printk("\n");
      show_trace(task, stack);
}

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

#ifdef CONFIG_MMU
void __bug(const char *file, int line, void *data)
{
      if (data)
            printk(KERN_CRIT "kernel BUG at %s:%d (data = %p)!\n",
                  file, line, data);
      else
            printk(KERN_CRIT "kernel BUG at %s:%d!\n", file, line);

      machine_halt();
}

int bad_trap(int trap_num, struct pt_regs *regs)
{
      printk(KERN_CRIT
            "unimplemented trap %d called at 0x%08lx, pid %d!\n",
            trap_num, regs->pc, current->pid);
      return -ENOSYS;
}

int debug_trap(struct pt_regs *regs)
{
      int i;
      printk(KERN_CRIT "debug trap\n");
      for (i = 0; i < 32; i++) {
            /* printk("r%i:%08X\t",i,regs->gpr[i]); */
            if ((i % 4) == 3)
                  printk(KERN_CRIT "\n");
      }
      printk(KERN_CRIT "pc:%08lX\tmsr:%08lX\n", regs->pc, regs->msr);
      return -ENOSYS;
}
#endif

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