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