xref: /linux/arch/um/kernel/sysrq.c (revision 06a130e42a5bfc84795464bff023bff4c16f58c5)
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 
17 static 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 
25 static const struct stacktrace_ops stackops = {
26 	.address = _print_addr
27 };
28 
29 void 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 (!segv_regs && os_is_signal_stack()) {
36 		pr_err("Received SIGSEGV in SIGSEGV handler,"
37 				" aborting stack trace!\n");
38 		return;
39 	}
40 
41 	if (!stack)
42 		stack = get_stack_pointer(task, segv_regs);
43 
44 	printk("%sStack:\n", loglvl);
45 	for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
46 		if (kstack_end(stack))
47 			break;
48 		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
49 			pr_cont("\n");
50 		pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
51 		stack++;
52 	}
53 
54 	printk("%sCall Trace:\n", loglvl);
55 	dump_trace(current, &stackops, (void *)loglvl);
56 }
57