// SPDX-License-Identifier: GPL-2.0-only/* * Stack trace management functions * *  Copyright (C) 2009-2021 Helge Deller <deller@gmx.de> *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com> *  and parisc unwind functions by Randolph Chung <tausq@debian.org> * *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT) */#include <linux/kernel.h>#include <linux/stacktrace.h> #include <asm/unwind.h> static void notrace walk_stackframe(struct task_struct *task,	struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie){	struct unwind_frame_info info; 	unwind_frame_init_task(&info, task, NULL);	while (1) {		if (unwind_once(&info) < 0 || info.ip == 0)			break; 		if (__kernel_text_address(info.ip))			if (!fn(cookie, info.ip))				break;	}} void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,		     struct task_struct *task, struct pt_regs *regs){	walk_stackframe(task, regs, consume_entry, cookie);} int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,			     struct task_struct *task){	walk_stackframe(task, NULL, consume_entry, cookie);	return 1;}