sysrq.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 4 * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
 5 */
 6
 7#include <linux/kallsyms.h>
 8#include <linux/kernel.h>
 9#include <linux/module.h>
10#include <linux/sched.h>
11#include <linux/sched/debug.h>
12#include <linux/sched/task_stack.h>
13
14#include <asm/stacktrace.h>
15#include <os.h>
16
17static void _print_addr(void *data, unsigned long address, int reliable)
18{
19	const char *loglvl = data;
20
21	printk("%s [<%08lx>] %s%pS\n", loglvl, address, reliable ? "" : "? ",
22		(void *)address);
23}
24
25static const struct stacktrace_ops stackops = {
26	.address = _print_addr
27};
28
29void show_stack(struct task_struct *task, unsigned long *stack,
30		       const char *loglvl)
31{
32	struct pt_regs *segv_regs = current->thread.segv_regs;
33	int i;
34
35	if (!stack)
36		stack = get_stack_pointer(task, segv_regs);
37
38	printk("%sStack:\n", loglvl);
39	for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
40		if (kstack_end(stack))
41			break;
42		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
43			pr_cont("\n");
44		pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
45		stack++;
46	}
47
48	printk("%sCall Trace:\n", loglvl);
49	dump_trace(task ?: current, &stackops, (void *)loglvl);
50}