linux/arch/um/kernel/sysrq.c
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   1/*
   2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Licensed under the GPL
   4 */
   5
   6#include <linux/kallsyms.h>
   7#include <linux/kernel.h>
   8#include <linux/module.h>
   9#include <linux/sched.h>
  10#include "sysrq.h"
  11
  12/* Catch non-i386 SUBARCH's. */
  13#if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
  14void show_trace(struct task_struct *task, unsigned long * stack)
  15{
  16        unsigned long addr;
  17
  18        if (!stack) {
  19                stack = (unsigned long*) &stack;
  20                WARN_ON(1);
  21        }
  22
  23        printk(KERN_INFO "Call Trace: \n");
  24        while (((long) stack & (THREAD_SIZE-1)) != 0) {
  25                addr = *stack;
  26                if (__kernel_text_address(addr)) {
  27                        printk(KERN_INFO "%08lx:  [<%08lx>]",
  28                               (unsigned long) stack, addr);
  29                        print_symbol(KERN_CONT " %s", addr);
  30                        printk(KERN_CONT "\n");
  31                }
  32                stack++;
  33        }
  34        printk(KERN_INFO "\n");
  35}
  36#endif
  37
  38/*
  39 * stack dumps generator - this is used by arch-independent code.
  40 * And this is identical to i386 currently.
  41 */
  42void dump_stack(void)
  43{
  44        unsigned long stack;
  45
  46        show_trace(current, &stack);
  47}
  48EXPORT_SYMBOL(dump_stack);
  49
  50/*Stolen from arch/i386/kernel/traps.c */
  51static const int kstack_depth_to_print = 24;
  52
  53/* This recently started being used in arch-independent code too, as in
  54 * kernel/sched.c.*/
  55void show_stack(struct task_struct *task, unsigned long *esp)
  56{
  57        unsigned long *stack;
  58        int i;
  59
  60        if (esp == NULL) {
  61                if (task != current && task != NULL) {
  62                        esp = (unsigned long *) KSTK_ESP(task);
  63                } else {
  64                        esp = (unsigned long *) &esp;
  65                }
  66        }
  67
  68        stack = esp;
  69        for (i = 0; i < kstack_depth_to_print; i++) {
  70                if (kstack_end(stack))
  71                        break;
  72                if (i && ((i % 8) == 0))
  73                        printk(KERN_INFO "       ");
  74                printk(KERN_CONT "%08lx ", *stack++);
  75        }
  76
  77        show_trace(task, esp);
  78}
  79
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