linux/arch/um/kernel/sysrq.c
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   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        pr_info(" [<%08lx>] %s%pS\n", address, reliable ? "" : "? ",
  21                (void *)address);
  22}
  23
  24static const struct stacktrace_ops stackops = {
  25        .address = _print_addr
  26};
  27
  28void show_stack(struct task_struct *task, unsigned long *stack)
  29{
  30        unsigned long *sp = stack;
  31        struct pt_regs *segv_regs = current->thread.segv_regs;
  32        int i;
  33
  34        if (!segv_regs && os_is_signal_stack()) {
  35                pr_err("Received SIGSEGV in SIGSEGV handler,"
  36                                " aborting stack trace!\n");
  37                return;
  38        }
  39
  40        if (!stack)
  41                sp = get_stack_pointer(task, segv_regs);
  42
  43        pr_info("Stack:\n");
  44        stack = sp;
  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", *stack++);
  51        }
  52        pr_cont("\n");
  53
  54        pr_info("Call Trace:\n");
  55        dump_trace(current, &stackops, NULL);
  56        pr_info("\n");
  57}
  58