// SPDX-License-Identifier: GPL-2.0/* * arch/sh/kernel/stacktrace.c * * Stack trace management functions * *  Copyright (C) 2006 - 2008  Paul Mundt */#include <linux/sched.h>#include <linux/sched/debug.h>#include <linux/stacktrace.h>#include <linux/thread_info.h>#include <linux/module.h>#include <asm/unwinder.h>#include <asm/ptrace.h>#include <asm/stacktrace.h> static int save_stack_stack(void *data, char *name){	return 0;} /* * Save stack-backtrace addresses into a stack_trace buffer. */static void save_stack_address(void *data, unsigned long addr, int reliable){	struct stack_trace *trace = data; 	if (!reliable)		return; 	if (trace->skip > 0) {		trace->skip--;		return;	} 	if (trace->nr_entries < trace->max_entries)		trace->entries[trace->nr_entries++] = addr;} static const struct stacktrace_ops save_stack_ops = {	.stack = save_stack_stack,	.address = save_stack_address,}; void save_stack_trace(struct stack_trace *trace){	unsigned long *sp = (unsigned long *)current_stack_pointer; 	unwind_stack(current, NULL, sp,  &save_stack_ops, trace);}EXPORT_SYMBOL_GPL(save_stack_trace); static voidsave_stack_address_nosched(void *data, unsigned long addr, int reliable){	struct stack_trace *trace = (struct stack_trace *)data; 	if (!reliable)		return; 	if (in_sched_functions(addr))		return; 	if (trace->skip > 0) {		trace->skip--;		return;	} 	if (trace->nr_entries < trace->max_entries)		trace->entries[trace->nr_entries++] = addr;} static const struct stacktrace_ops save_stack_ops_nosched = {	.stack = save_stack_stack,	.address = save_stack_address_nosched,}; void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace){	unsigned long *sp = (unsigned long *)tsk->thread.sp; 	unwind_stack(current, NULL, sp,  &save_stack_ops_nosched, trace);}EXPORT_SYMBOL_GPL(save_stack_trace_tsk);