LXR linux/arch/microblaze/kernel/traps.c

   1/*
   2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3 * Copyright (C) 2007-2009 PetaLogix
   4 * Copyright (C) 2006 Atmark Techno, Inc.
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License. See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/kallsyms.h>
  13#include <linux/module.h>
  14#include <linux/sched.h>
  15#include <linux/debug_locks.h>
  16
  17#include <asm/exceptions.h>
  18#include <asm/system.h>
  19
  20void trap_init(void)
  21{
  22        __enable_hw_exceptions();
  23}
  24
  25static int kstack_depth_to_print = 24;
  26
  27static int __init kstack_setup(char *s)
  28{
  29        kstack_depth_to_print = strict_strtoul(s, 0, NULL);
  30
  31        return 1;
  32}
  33__setup("kstack=", kstack_setup);
  34
  35void show_trace(struct task_struct *task, unsigned long *stack)
  36{
  37        unsigned long addr;
  38
  39        if (!stack)
  40                stack = (unsigned long *)&stack;
  41
  42        printk(KERN_NOTICE "Call Trace: ");
  43#ifdef CONFIG_KALLSYMS
  44        printk(KERN_NOTICE "\n");
  45#endif
  46        while (!kstack_end(stack)) {
  47                addr = *stack++;
  48                /*
  49                 * If the address is either in the text segment of the
  50                 * kernel, or in the region which contains vmalloc'ed
  51                 * memory, it *may* be the address of a calling
  52                 * routine; if so, print it so that someone tracing
  53                 * down the cause of the crash will be able to figure
  54                 * out the call path that was taken.
  55                 */
  56                if (kernel_text_address(addr))
  57                        print_ip_sym(addr);
  58        }
  59        printk(KERN_NOTICE "\n");
  60
  61        if (!task)
  62                task = current;
  63
  64        debug_show_held_locks(task);
  65}
  66
  67void show_stack(struct task_struct *task, unsigned long *sp)
  68{
  69        unsigned long *stack;
  70        int i;
  71
  72        if (sp == NULL) {
  73                if (task)
  74                        sp = (unsigned long *) ((struct thread_info *)
  75                                                (task->stack))->cpu_context.r1;
  76                else
  77                        sp = (unsigned long *)&sp;
  78        }
  79
  80        stack = sp;
  81
  82        printk(KERN_INFO "\nStack:\n  ");
  83
  84        for (i = 0; i < kstack_depth_to_print; i++) {
  85                if (kstack_end(sp))
  86                        break;
  87                if (i && ((i % 8) == 0))
  88                        printk("\n  ");
  89                printk("%08lx ", *sp++);
  90        }
  91        printk("\n");
  92        show_trace(task, stack);
  93}
  94
  95void dump_stack(void)
  96{
  97        show_stack(NULL, NULL);
  98}
  99EXPORT_SYMBOL(dump_stack);
 100
 101#ifdef CONFIG_MMU
 102void __bug(const char *file, int line, void *data)
 103{
 104        if (data)
 105                printk(KERN_CRIT "kernel BUG at %s:%d (data = %p)!\n",
 106                        file, line, data);
 107        else
 108                printk(KERN_CRIT "kernel BUG at %s:%d!\n", file, line);
 109
 110        machine_halt();
 111}
 112
 113int bad_trap(int trap_num, struct pt_regs *regs)
 114{
 115        printk(KERN_CRIT
 116                "unimplemented trap %d called at 0x%08lx, pid %d!\n",
 117                trap_num, regs->pc, current->pid);
 118        return -ENOSYS;
 119}
 120
 121int debug_trap(struct pt_regs *regs)
 122{
 123        int i;
 124        printk(KERN_CRIT "debug trap\n");
 125        for (i = 0; i < 32; i++) {
 126                /* printk("r%i:%08X\t",i,regs->gpr[i]); */
 127                if ((i % 4) == 3)
 128                        printk(KERN_CRIT "\n");
 129        }
 130        printk(KERN_CRIT "pc:%08lX\tmsr:%08lX\n", regs->pc, regs->msr);
 131        return -ENOSYS;
 132}
 133#endif
 134