um/kernel/sysrq.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
0004  * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
0005  */
0006
0007 #include <linux/kallsyms.h>
0008 #include <linux/kernel.h>
0009 #include <linux/module.h>
0010 #include <linux/sched.h>
0011 #include <linux/sched/debug.h>
0012 #include <linux/sched/task_stack.h>
0013
0014 #include <asm/sysrq.h>
0015 #include <asm/stacktrace.h>
0016 #include <os.h>
0017
0018 static void _print_addr(void *data, unsigned long address, int reliable)
0019 {
0020     const char *loglvl = data;
0021
0022     printk("%s [<%08lx>] %s%pS\n", loglvl, address, reliable ? "" : "? ",
0023         (void *)address);
0024 }
0025
0026 static const struct stacktrace_ops stackops = {
0027     .address = _print_addr
0028 };
0029
0030 void show_stack(struct task_struct *task, unsigned long *stack,
0031                const char *loglvl)
0032 {
0033     struct pt_regs *segv_regs = current->thread.segv_regs;
0034     int i;
0035
0036     if (!segv_regs && os_is_signal_stack()) {
0037         pr_err("Received SIGSEGV in SIGSEGV handler,"
0038                 " aborting stack trace!\n");
0039         return;
0040     }
0041
0042     if (!stack)
0043         stack = get_stack_pointer(task, segv_regs);
0044
0045     printk("%sStack:\n", loglvl);
0046     for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
0047         if (kstack_end(stack))
0048             break;
0049         if (i && ((i % STACKSLOTS_PER_LINE) == 0))
0050             pr_cont("\n");
0051         pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
0052         stack++;
0053     }
0054
0055     printk("%sCall Trace:\n", loglvl);
0056     dump_trace(current, &stackops, (void *)loglvl);
0057 }