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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* 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) 2000-2007 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>
extern void arch_enable_nmi(void);
extern void stop_watchdog(void);
extern void reset_watchdog(void);
extern void show_registers(struct pt_regs *regs);
#ifdef CONFIG_DEBUG_BUGVERBOSE
extern void handle_BUG(struct pt_regs *regs);
#else
#define handle_BUG(regs)
#endif
static int kstack_depth_to_print = 24;
void (*nmi_handler)(struct pt_regs *);
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(void)
{
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
set_nmi_handler(void (*handler)(struct pt_regs *))
{
nmi_handler = handler;
arch_enable_nmi();
}
#ifdef CONFIG_DEBUG_NMI_OOPS
void
oops_nmi_handler(struct pt_regs *regs)
{
stop_watchdog();
oops_in_progress = 1;
printk("NMI!\n");
show_registers(regs);
oops_in_progress = 0;
}
static int __init
oops_nmi_register(void)
{
set_nmi_handler(oops_nmi_handler);
return 0;
}
__initcall(oops_nmi_register);
#endif
/*
* This gets called from entry.S when the watchdog has bitten. Show something
* similiar to an Oops dump, and if the kernel is configured to be a nice
* doggy, then halt instead of reboot.
*/
void
watchdog_bite_hook(struct pt_regs *regs)
{
#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
local_irq_disable();
stop_watchdog();
show_registers(regs);
while (1)
; /* Do nothing. */
#else
show_registers(regs);
#endif
}
/* This is normally the Oops function. */
void
die_if_kernel(const char *str, struct pt_regs *regs, long err)
{
if (user_mode(regs))
return;
#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
/*
* This printout might take too long and could trigger
* the watchdog normally. If NICE_DOGGY is set, simply
* stop the watchdog during the printout.
*/
stop_watchdog();
#endif
handle_BUG(regs);
printk("%s: %04lx\n", str, err & 0xffff);
show_registers(regs);
oops_in_progress = 0;
#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
reset_watchdog();
#endif
do_exit(SIGSEGV);
}
void __init
trap_init(void)
{
/* Nothing needs to be done */
}
|
