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