aboutsummaryrefslogtreecommitdiffstats
path: root/arch/h8300/kernel/traps.c
blob: dfa05bd908b6b22139c388ebbe983721c39b6100 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
 * linux/arch/h8300/boot/traps.c -- general exception handling code
 * H8/300 support Yoshinori Sato <ysato@users.sourceforge.jp>
 * 
 * Cloned from Linux/m68k.
 *
 * No original Copyright holder listed,
 * Probable original (C) Roman Zippel (assigned DJD, 1999)
 *
 * Copyright 1999-2000 D. Jeff Dionne, <jeff@rt-control.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/bug.h>

#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/page.h>

static DEFINE_SPINLOCK(die_lock);

/*
 * this must be called very early as the kernel might
 * use some instruction that are emulated on the 060
 */

void __init base_trap_init(void)
{
}

void __init trap_init (void)
{
}

asmlinkage void set_esp0 (unsigned long ssp)
{
	current->thread.esp0 = ssp;
}

/*
 *	Generic dumping code. Used for panic and debug.
 */

static void dump(struct pt_regs *fp)
{
	unsigned long	*sp;
	unsigned char	*tp;
	int		i;

	printk("\nCURRENT PROCESS:\n\n");
	printk("COMM=%s PID=%d\n", current->comm, current->pid);
	if (current->mm) {
		printk("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
			(int) current->mm->start_code,
			(int) current->mm->end_code,
			(int) current->mm->start_data,
			(int) current->mm->end_data,
			(int) current->mm->end_data,
			(int) current->mm->brk);
		printk("USER-STACK=%08x  KERNEL-STACK=%08lx\n\n",
			(int) current->mm->start_stack,
			(int) PAGE_SIZE+(unsigned long)current);
	}

	show_regs(fp);
	printk("\nCODE:");
	tp = ((unsigned char *) fp->pc) - 0x20;
	for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {
		if ((i % 0x10) == 0)
			printk("\n%08x: ", (int) (tp + i));
		printk("%08x ", (int) *sp++);
	}
	printk("\n");

	printk("\nKERNEL STACK:");
	tp = ((unsigned char *) fp) - 0x40;
	for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
		if ((i % 0x10) == 0)
			printk("\n%08x: ", (int) (tp + i));
		printk("%08x ", (int) *sp++);
	}
	printk("\n");
	if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE))
                printk("(Possibly corrupted stack page??)\n");

	printk("\n\n");
}

void die(const char *str, struct pt_regs *fp, unsigned long err)
{
	static int diecount;

	oops_enter();

	console_verbose();
	spin_lock_irq(&die_lock);
	report_bug(fp->pc, fp);
	printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++diecount);
	dump(fp);

	spin_unlock_irq(&die_lock);
	do_exit(SIGSEGV);
}

extern char _start, _etext;
#define check_kernel_text(addr) \
        ((addr >= (unsigned long)(&_start)) && \
         (addr <  (unsigned long)(&_etext))) 

static int kstack_depth_to_print = 24;

void show_stack(struct task_struct *task, unsigned long *esp)
{
	unsigned long *stack,  addr;
	int i;

	if (esp == NULL)
		esp = (unsigned long *) &esp;

	stack = esp;

	printk("Stack from %08lx:", (unsigned long)stack);
	for (i = 0; i < kstack_depth_to_print; i++) {
		if (((unsigned long)stack & (THREAD_SIZE - 1)) == 0)
			break;
		if (i % 8 == 0)
			printk("\n       ");
		printk(" %08lx", *stack++);
	}

	printk("\nCall Trace:");
	i = 0;
	stack = esp;
	while (((unsigned long)stack & (THREAD_SIZE - 1)) != 0) {
		addr = *stack++;
		/*
		 * If the address is either in the text segment of the
		 * kernel, or in the region which contains vmalloc'ed
		 * memory, it *may* be the address of a calling
		 * routine; if so, print it so that someone tracing
		 * down the cause of the crash will be able to figure
		 * out the call path that was taken.
		 */
		if (check_kernel_text(addr)) {
			if (i % 4 == 0)
				printk("\n       ");
			printk(" [<%08lx>]", addr);
			i++;
		}
	}
	printk("\n");
}

void show_trace_task(struct task_struct *tsk)
{
	show_stack(tsk,(unsigned long *)tsk->thread.esp0);
}

void dump_stack(void)
{
	show_stack(NULL,NULL);
}

EXPORT_SYMBOL(dump_stack);