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
16 static 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
32 void 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
38 int 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
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