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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
548f1176 HD |
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 | ||
16 | static void dump_trace(struct task_struct *task, struct stack_trace *trace) | |
17 | { | |
18 | struct unwind_frame_info info; | |
19 | ||
9e0d5c45 | 20 | unwind_frame_init_task(&info, task, NULL); |
548f1176 HD |
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 | ||
548f1176 HD |
33 | /* |
34 | * Save stack-backtrace addresses into a stack_trace buffer. | |
35 | */ | |
36 | void save_stack_trace(struct stack_trace *trace) | |
37 | { | |
38 | dump_trace(current, trace); | |
548f1176 HD |
39 | } |
40 | EXPORT_SYMBOL_GPL(save_stack_trace); | |
41 | ||
42 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
43 | { | |
44 | dump_trace(tsk, trace); | |
548f1176 HD |
45 | } |
46 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |