summaryrefslogtreecommitdiff
path: root/arch/sh/kernel/stacktrace.c
blob: 6c24a400b05e761dccb41f8c195c4374e508018b (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
/*
 * arch/sh/kernel/stacktrace.c
 *
 * Stack trace management functions
 *
 *  Copyright (C) 2006 - 2008  Paul Mundt
 *
 * 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/sched.h>
#include <linux/stacktrace.h>
#include <linux/thread_info.h>
#include <linux/module.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.h>

static void save_stack_warning(void *data, char *msg)
{
}

static void
save_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
{
}

static int save_stack_stack(void *data, char *name)
{
	return 0;
}

/*
 * Save stack-backtrace addresses into a stack_trace buffer.
 */
static void save_stack_address(void *data, unsigned long addr, int reliable)
{
	struct stack_trace *trace = data;

	if (trace->skip > 0) {
		trace->skip--;
		return;
	}

	if (trace->nr_entries < trace->max_entries)
		trace->entries[trace->nr_entries++] = addr;
}

static const struct stacktrace_ops save_stack_ops = {
	.warning = save_stack_warning,
	.warning_symbol = save_stack_warning_symbol,
	.stack = save_stack_stack,
	.address = save_stack_address,
};

void save_stack_trace(struct stack_trace *trace)
{
	unsigned long *sp = (unsigned long *)current_stack_pointer;

	dump_trace(current, NULL, sp,  &save_stack_ops, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace);

static void
save_stack_address_nosched(void *data, unsigned long addr, int reliable)
{
	struct stack_trace *trace = (struct stack_trace *)data;

	if (in_sched_functions(addr))
		return;

	if (trace->skip > 0) {
		trace->skip--;
		return;
	}

	if (trace->nr_entries < trace->max_entries)
		trace->entries[trace->nr_entries++] = addr;
}

static const struct stacktrace_ops save_stack_ops_nosched = {
	.warning = save_stack_warning,
	.warning_symbol = save_stack_warning_symbol,
	.stack = save_stack_stack,
	.address = save_stack_address_nosched,
};

void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
	unsigned long *sp = (unsigned long *)tsk->thread.sp;

	dump_trace(current, NULL, sp,  &save_stack_ops_nosched, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);