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}
44