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
  21 static 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
  27 static const struct stacktrace_ops stackops = {
  28         .address = _print_addr
  29 };
  30
  31 void 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 }