LXR linux/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
  18static 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
  26static const struct stacktrace_ops stackops = {
  27        .address = _print_addr
  28};
  29
  30void 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", *stack++);
  52        }
  53
  54        printk("%sCall Trace:\n", loglvl);
  55        dump_trace(current, &stackops, (void *)loglvl);
  56}
  57