1// SPDX-License-Identifier: GPL-2.0
 2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
 3
 4#include <linux/ptrace.h>
 5
 6int kstack_depth_to_print = 48;
 7
 8void show_trace(unsigned long *stack)
 9{
10	unsigned long *stack_end;
11	unsigned long *stack_start;
12	unsigned long *fp;
13	unsigned long addr;
14
15	addr = (unsigned long) stack & THREAD_MASK;
16	stack_start = (unsigned long *) addr;
17	stack_end = (unsigned long *) (addr + THREAD_SIZE);
18
19	fp = stack;
20	pr_info("\nCall Trace:");
21
22	while (fp > stack_start && fp < stack_end) {
23#ifdef CONFIG_STACKTRACE
24		addr	= fp[1];
25		fp	= (unsigned long *) fp[0];
26#else
27		addr	= *fp++;
28#endif
29		if (__kernel_text_address(addr))
30			pr_cont("\n[<%08lx>] %pS", addr, (void *)addr);
31	}
32	pr_cont("\n");
33}
34
35void show_stack(struct task_struct *task, unsigned long *stack)
36{
37	if (!stack) {
38		if (task)
39			stack = (unsigned long *)thread_saved_fp(task);
40		else
41#ifdef CONFIG_STACKTRACE
42			asm volatile("mov %0, r8\n":"=r"(stack)::"memory");
43#else
44			stack = (unsigned long *)&stack;
45#endif
46	}
47
48	show_trace(stack);
49}