1/*
 2 * arch/sh/kernel/stacktrace.c
 3 *
 4 * Stack trace management functions
 5 *
 6 *  Copyright (C) 2006 - 2008  Paul Mundt
 7 *
 8 * This file is subject to the terms and conditions of the GNU General Public
 9 * License.  See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12#include <linux/sched.h>
 
13#include <linux/stacktrace.h>
14#include <linux/thread_info.h>
15#include <linux/module.h>
16#include <asm/unwinder.h>
17#include <asm/ptrace.h>
18#include <asm/stacktrace.h>
19
20static int save_stack_stack(void *data, char *name)
21{
22	return 0;
23}
24
25/*
26 * Save stack-backtrace addresses into a stack_trace buffer.
27 */
28static void save_stack_address(void *data, unsigned long addr, int reliable)
29{
30	struct stack_trace *trace = data;
31
32	if (!reliable)
33		return;
34
35	if (trace->skip > 0) {
36		trace->skip--;
37		return;
38	}
39
40	if (trace->nr_entries < trace->max_entries)
41		trace->entries[trace->nr_entries++] = addr;
42}
43
44static const struct stacktrace_ops save_stack_ops = {
45	.stack = save_stack_stack,
46	.address = save_stack_address,
47};
48
49void save_stack_trace(struct stack_trace *trace)
50{
51	unsigned long *sp = (unsigned long *)current_stack_pointer;
52
53	unwind_stack(current, NULL, sp,  &save_stack_ops, trace);
54	if (trace->nr_entries < trace->max_entries)
55		trace->entries[trace->nr_entries++] = ULONG_MAX;
56}
57EXPORT_SYMBOL_GPL(save_stack_trace);
58
59static void
60save_stack_address_nosched(void *data, unsigned long addr, int reliable)
61{
62	struct stack_trace *trace = (struct stack_trace *)data;
63
64	if (!reliable)
65		return;
66
67	if (in_sched_functions(addr))
68		return;
69
70	if (trace->skip > 0) {
71		trace->skip--;
72		return;
73	}
74
75	if (trace->nr_entries < trace->max_entries)
76		trace->entries[trace->nr_entries++] = addr;
77}
78
79static const struct stacktrace_ops save_stack_ops_nosched = {
80	.stack = save_stack_stack,
81	.address = save_stack_address_nosched,
82};
83
84void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
85{
86	unsigned long *sp = (unsigned long *)tsk->thread.sp;
87
88	unwind_stack(current, NULL, sp,  &save_stack_ops_nosched, trace);
89	if (trace->nr_entries < trace->max_entries)
90		trace->entries[trace->nr_entries++] = ULONG_MAX;
91}
92EXPORT_SYMBOL_GPL(save_stack_trace_tsk);

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * arch/sh/kernel/stacktrace.c
 4 *
 5 * Stack trace management functions
 6 *
 7 *  Copyright (C) 2006 - 2008  Paul Mundt
 
 
 
 
 8 */
 9#include <linux/sched.h>
10#include <linux/sched/debug.h>
11#include <linux/stacktrace.h>
12#include <linux/thread_info.h>
13#include <linux/module.h>
14#include <asm/unwinder.h>
15#include <asm/ptrace.h>
16#include <asm/stacktrace.h>
17
18static int save_stack_stack(void *data, char *name)
19{
20	return 0;
21}
22
23/*
24 * Save stack-backtrace addresses into a stack_trace buffer.
25 */
26static void save_stack_address(void *data, unsigned long addr, int reliable)
27{
28	struct stack_trace *trace = data;
29
30	if (!reliable)
31		return;
32
33	if (trace->skip > 0) {
34		trace->skip--;
35		return;
36	}
37
38	if (trace->nr_entries < trace->max_entries)
39		trace->entries[trace->nr_entries++] = addr;
40}
41
42static const struct stacktrace_ops save_stack_ops = {
43	.stack = save_stack_stack,
44	.address = save_stack_address,
45};
46
47void save_stack_trace(struct stack_trace *trace)
48{
49	unsigned long *sp = (unsigned long *)current_stack_pointer;
50
51	unwind_stack(current, NULL, sp,  &save_stack_ops, trace);
 
 
52}
53EXPORT_SYMBOL_GPL(save_stack_trace);
54
55static void
56save_stack_address_nosched(void *data, unsigned long addr, int reliable)
57{
58	struct stack_trace *trace = (struct stack_trace *)data;
59
60	if (!reliable)
61		return;
62
63	if (in_sched_functions(addr))
64		return;
65
66	if (trace->skip > 0) {
67		trace->skip--;
68		return;
69	}
70
71	if (trace->nr_entries < trace->max_entries)
72		trace->entries[trace->nr_entries++] = addr;
73}
74
75static const struct stacktrace_ops save_stack_ops_nosched = {
76	.stack = save_stack_stack,
77	.address = save_stack_address_nosched,
78};
79
80void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
81{
82	unsigned long *sp = (unsigned long *)tsk->thread.sp;
83
84	unwind_stack(current, NULL, sp,  &save_stack_ops_nosched, trace);
 
 
85}
86EXPORT_SYMBOL_GPL(save_stack_trace_tsk);