Linux 5.8-rc4
[linux/fpc-iii.git] / arch / parisc / kernel / stacktrace.c
blob34bf6d6bf6e8ff40d1ddc112242e7b5142b17f35
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Stack trace management functions
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>
9 * TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
11 #include <linux/module.h>
12 #include <linux/stacktrace.h>
14 #include <asm/unwind.h>
16 static void dump_trace(struct task_struct *task, struct stack_trace *trace)
18 struct unwind_frame_info info;
20 unwind_frame_init_task(&info, task, NULL);
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;
28 if (__kernel_text_address(info.ip))
29 trace->entries[trace->nr_entries++] = info.ip;
34 * Save stack-backtrace addresses into a stack_trace buffer.
36 void save_stack_trace(struct stack_trace *trace)
38 dump_trace(current, trace);
40 EXPORT_SYMBOL_GPL(save_stack_trace);
42 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
44 dump_trace(tsk, trace);
46 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);