LXR linux/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
  29static 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
  36void __init base_trap_init(void)
  37{
  38}
  39
  40void __init trap_init(void)
  41{
  42}
  43
  44asmlinkage 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
  53static void dump(struct pt_regs *fp)
  54{
  55        unsigned long   *sp;
  56        unsigned char   *tp;
  57        int             i;
  58
  59        pr_info("\nCURRENT PROCESS:\n\n");
  60        pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
  61        if (current->mm) {
  62                pr_info("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                pr_info("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        pr_info("\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                        pr_info("\n%08x: ", (int) (tp + i));
  80                pr_info("%08x ", (int) *sp++);
  81        }
  82        pr_info("\n");
  83
  84        pr_info("\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                        pr_info("\n%08x: ", (int) (tp + i));
  89                pr_info("%08x ", (int) *sp++);
  90        }
  91        pr_info("\n");
  92        if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE))
  93                pr_info("(Possibly corrupted stack page??)\n");
  94
  95        pr_info("\n\n");
  96}
  97
  98void 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        pr_crit("%s: %04lx [#%d] ", str, err & 0xffff, ++diecount);
 108        dump(fp);
 109
 110        spin_unlock_irq(&die_lock);
 111        do_exit(SIGSEGV);
 112}
 113
 114static int kstack_depth_to_print = 24;
 115
 116void show_stack(struct task_struct *task, unsigned long *esp)
 117{
 118        unsigned long *stack,  addr;
 119        int i;
 120
 121        if (esp == NULL)
 122                esp = (unsigned long *) &esp;
 123
 124        stack = esp;
 125
 126        pr_info("Stack from %08lx:", (unsigned long)stack);
 127        for (i = 0; i < kstack_depth_to_print; i++) {
 128                if (((unsigned long)stack & (THREAD_SIZE - 1)) >=
 129                    THREAD_SIZE-4)
 130                        break;
 131                if (i % 8 == 0)
 132                        pr_info(" ");
 133                pr_cont(" %08lx", *stack++);
 134        }
 135
 136        pr_info("\nCall Trace:\n");
 137        i = 0;
 138        stack = esp;
 139        while (((unsigned long)stack & (THREAD_SIZE - 1)) < THREAD_SIZE-4) {
 140                addr = *stack++;
 141                /*
 142                 * If the address is either in the text segment of the
 143                 * kernel, or in the region which contains vmalloc'ed
 144                 * memory, it *may* be the address of a calling
 145                 * routine; if so, print it so that someone tracing
 146                 * down the cause of the crash will be able to figure
 147                 * out the call path that was taken.
 148                 */
 149                if (check_kernel_text(addr)) {
 150                        if (i % 4 == 0)
 151                                pr_info("       ");
 152                        pr_cont(" [<%08lx>]", addr);
 153                        i++;
 154                }
 155        }
 156        pr_info("\n");
 157}
 158