LXR linux/arch/um/kernel/sysrq.c

   1/*
   2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License version 2 as
   7 * published by the Free Software Foundation.
   8 */
   9
  10#include <linux/kallsyms.h>
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/sched.h>
  14#include <linux/sched/debug.h>
  15#include <linux/sched/task_stack.h>
  16
  17#include <asm/sysrq.h>
  18#include <asm/stacktrace.h>
  19#include <os.h>
  20
  21static void _print_addr(void *data, unsigned long address, int reliable)
  22{
  23        pr_info(" [<%08lx>] %s%pF\n", address, reliable ? "" : "? ",
  24                (void *)address);
  25}
  26
  27static const struct stacktrace_ops stackops = {
  28        .address = _print_addr
  29};
  30
  31void show_stack(struct task_struct *task, unsigned long *stack)
  32{
  33        unsigned long *sp = stack;
  34        struct pt_regs *segv_regs = current->thread.segv_regs;
  35        int i;
  36
  37        if (!segv_regs && os_is_signal_stack()) {
  38                pr_err("Received SIGSEGV in SIGSEGV handler,"
  39                                " aborting stack trace!\n");
  40                return;
  41        }
  42
  43        if (!stack)
  44                sp = get_stack_pointer(task, segv_regs);
  45
  46        pr_info("Stack:\n");
  47        stack = sp;
  48        for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
  49                if (kstack_end(stack))
  50                        break;
  51                if (i && ((i % STACKSLOTS_PER_LINE) == 0))
  52                        pr_cont("\n");
  53                pr_cont(" %08lx", *stack++);
  54        }
  55        pr_cont("\n");
  56
  57        pr_info("Call Trace:\n");
  58        dump_trace(current, &stackops, NULL);
  59        pr_info("\n");
  60}
  61