// SPDX-License-Identifier: GPL-2.0// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/ptrace.h> int kstack_depth_to_print = 48; void show_trace(unsigned long *stack){	unsigned long *stack_end;	unsigned long *stack_start;	unsigned long *fp;	unsigned long addr; 	addr = (unsigned long) stack & THREAD_MASK;	stack_start = (unsigned long *) addr;	stack_end = (unsigned long *) (addr + THREAD_SIZE); 	fp = stack;	pr_info("\nCall Trace:"); 	while (fp > stack_start && fp < stack_end) {#ifdef CONFIG_STACKTRACE		addr	= fp[1];		fp	= (unsigned long *) fp[0];#else		addr	= *fp++;#endif		if (__kernel_text_address(addr))			pr_cont("\n[<%08lx>] %pS", addr, (void *)addr);	}	pr_cont("\n");} void show_stack(struct task_struct *task, unsigned long *stack){	if (!stack) {		if (task)			stack = (unsigned long *)thread_saved_fp(task);		else#ifdef CONFIG_STACKTRACE			asm volatile("mov %0, r8\n":"=r"(stack)::"memory");#else			stack = (unsigned long *)&stack;#endif	} 	show_trace(stack);}