GNU Linux-libre 6.1.91-gnu
[releases.git] / arch / um / kernel / 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/sysrq.h>
15 #include <asm/stacktrace.h>
16 #include <os.h>
17
18 static void _print_addr(void *data, unsigned long address, int reliable)
19 {
20         const char *loglvl = data;
21
22         printk("%s [<%08lx>] %s%pS\n", loglvl, address, reliable ? "" : "? ",
23                 (void *)address);
24 }
25
26 static const struct stacktrace_ops stackops = {
27         .address = _print_addr
28 };
29
30 void show_stack(struct task_struct *task, unsigned long *stack,
31                        const char *loglvl)
32 {
33         struct pt_regs *segv_regs = current->thread.segv_regs;
34         int i;
35
36         if (!segv_regs && os_is_signal_stack()) {
37                 pr_err("Received SIGSEGV in SIGSEGV handler,"
38                                 " aborting stack trace!\n");
39                 return;
40         }
41
42         if (!stack)
43                 stack = get_stack_pointer(task, segv_regs);
44
45         printk("%sStack:\n", loglvl);
46         for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
47                 if (kstack_end(stack))
48                         break;
49                 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
50                         pr_cont("\n");
51                 pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
52                 stack++;
53         }
54
55         printk("%sCall Trace:\n", loglvl);
56         dump_trace(current, &stackops, (void *)loglvl);
57 }