aboutsummaryrefslogtreecommitdiffstats
path: root/arch/cris/kernel/traps.c
blob: d4dfa050e3a5c335468c9915eba20ae74f518571 (plain) (blame)
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
/* $Id: traps.c,v 1.9 2004/05/11 12:28:26 starvik Exp $
 *
 *  linux/arch/cris/traps.c
 *
 *  Here we handle the break vectors not used by the system call 
 *  mechanism, as well as some general stack/register dumping 
 *  things.
 * 
 *  Copyright (C) 2000-2002 Axis Communications AB
 *
 *  Authors:   Bjorn Wesen
 *  	       Hans-Peter Nilsson
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>

static int kstack_depth_to_print = 24;

void show_trace(unsigned long * stack)
{
	unsigned long addr, module_start, module_end;
	extern char _stext, _etext;
	int i;

        printk("\nCall Trace: ");

        i = 1;
        module_start = VMALLOC_START;
        module_end = VMALLOC_END;

        while (((long) stack & (THREAD_SIZE-1)) != 0) {
		if (__get_user (addr, stack)) {
			/* This message matches "failing address" marked
			   s390 in ksymoops, so lines containing it will
			   not be filtered out by ksymoops.  */
			printk ("Failing address 0x%lx\n", (unsigned long)stack);
			break;
		}
		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 (((addr >= (unsigned long) &_stext) &&
                     (addr <= (unsigned long) &_etext)) ||
                    ((addr >= module_start) && (addr <= module_end))) {
                        if (i && ((i % 8) == 0))
                                printk("\n       ");
                        printk("[<%08lx>] ", addr);
                        i++;
                }
        }
}

/*
 * These constants are for searching for possible module text
 * segments. MODULE_RANGE is a guess of how much space is likely
 * to be vmalloced.
 */

#define MODULE_RANGE (8*1024*1024)

/*
 * The output (format, strings and order) is adjusted to be usable with
 * ksymoops-2.4.1 with some necessary CRIS-specific patches.  Please don't
 * change it unless you're serious about adjusting ksymoops and syncing
 * with the ksymoops maintainer.
 */

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

	/*
	 * debugging aid: "show_stack(NULL);" prints a
	 * back trace.
	 */

        if(sp == NULL) {
		if (task)
			sp = (unsigned long*)task->thread.ksp;
		else
			sp = (unsigned long*)rdsp();
	}

        stack = sp;

	printk("\nStack from %08lx:\n       ", (unsigned long)stack);
        for(i = 0; i < kstack_depth_to_print; i++) {
                if (((long) stack & (THREAD_SIZE-1)) == 0)
                        break;
                if (i && ((i % 8) == 0))
                        printk("\n       ");
		if (__get_user (addr, stack)) {
			/* This message matches "failing address" marked
			   s390 in ksymoops, so lines containing it will
			   not be filtered out by ksymoops.  */
			printk ("Failing address 0x%lx\n", (unsigned long)stack);
			break;
		}
		stack++;
		printk("%08lx ", addr);
        }
	show_trace(sp);
}

#if 0
/* displays a short stack trace */

int 
show_stack()
{
	unsigned long *sp = (unsigned long *)rdusp();
	int i;
	printk("Stack dump [0x%08lx]:\n", (unsigned long)sp);
	for(i = 0; i < 16; i++)
		printk("sp + %d: 0x%08lx\n", i*4, sp[i]);
	return 0;
}
#endif

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

EXPORT_SYMBOL(dump_stack);

void __init 
trap_init(void)
{
	/* Nothing needs to be done */
}