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Linux/arch/h8300/kernel/traps.c

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  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 
 31 static 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 
 38 void __init base_trap_init(void)
 39 {
 40 }
 41 
 42 void __init trap_init(void)
 43 {
 44 }
 45 
 46 asmlinkage 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 
 55 static 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 
100 void 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 
116 static int kstack_depth_to_print = 24;
117 
118 void 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 

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