1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Stack trace management functions
 4 *
 5 *  Copyright (C) 2009 Helge Deller <deller@gmx.de>
 6 *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
 7 *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
 8 *
 9 *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
10 */
11#include <linux/module.h>
12#include <linux/stacktrace.h>
13
14#include <asm/unwind.h>
15
16static void dump_trace(struct task_struct *task, struct stack_trace *trace)
 
17{
18	struct unwind_frame_info info;
19
20	unwind_frame_init_task(&info, task, NULL);
21
22	/* unwind stack and save entries in stack_trace struct */
23	trace->nr_entries = 0;
24	while (trace->nr_entries < trace->max_entries) {
25		if (unwind_once(&info) < 0 || info.ip == 0)
26			break;
27
28		if (__kernel_text_address(info.ip))
29			trace->entries[trace->nr_entries++] = info.ip;
 
30	}
31}
32
33/*
34 * Save stack-backtrace addresses into a stack_trace buffer.
35 */
36void save_stack_trace(struct stack_trace *trace)
37{
38	dump_trace(current, trace);
39}
40EXPORT_SYMBOL_GPL(save_stack_trace);
41
42void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
 
43{
44	dump_trace(tsk, trace);
 
45}
46EXPORT_SYMBOL_GPL(save_stack_trace_tsk);

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Stack trace management functions
 4 *
 5 *  Copyright (C) 2009-2021 Helge Deller <deller@gmx.de>
 6 *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
 7 *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
 8 *
 9 *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
10 */
11#include <linux/kernel.h>
12#include <linux/stacktrace.h>
13
14#include <asm/unwind.h>
15
16static void notrace walk_stackframe(struct task_struct *task,
17	struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie)
18{
19	struct unwind_frame_info info;
20
21	unwind_frame_init_task(&info, task, NULL);
22	while (1) {
 
 
 
23		if (unwind_once(&info) < 0 || info.ip == 0)
24			break;
25
26		if (__kernel_text_address(info.ip))
27			if (!fn(cookie, info.ip))
28				break;
29	}
30}
31
32void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
33		     struct task_struct *task, struct pt_regs *regs)
 
 
34{
35	walk_stackframe(task, regs, consume_entry, cookie);
36}
 
37
38int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
39			     struct task_struct *task)
40{
41	walk_stackframe(task, NULL, consume_entry, cookie);
42	return 1;
43}