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 <asm/sysrq.h>
  15 #include <asm/stacktrace.h>
  16 #include <os.h>
  17
  18 static void _print_addr(void *data, unsigned long address, int reliable)
  19 {
  20         pr_info(" [<%08lx>]", address);
  21         pr_cont(" %s", reliable ? "" : "? ");
  22         print_symbol("%s", address);
  23         pr_cont("\n");
  24 }
  25
  26 static const struct stacktrace_ops stackops = {
  27         .address = _print_addr
  28 };
  29
  30 void show_stack(struct task_struct *task, unsigned long *stack)
  31 {
  32         unsigned long *sp = stack;
  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                 sp = get_stack_pointer(task, segv_regs);
  44
  45         pr_info("Stack:\n");
  46         stack = sp;
  47         for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
  48                 if (kstack_end(stack))
  49                         break;
  50                 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
  51                         pr_cont("\n");
  52                 pr_cont(" %08lx", *stack++);
  53         }
  54         pr_cont("\n");
  55
  56         pr_info("Call Trace:\n");
  57         dump_trace(current, &stackops, NULL);
  58         pr_info("\n");
  59 }