arch/um/kernel/sysrq.c

   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)
  14 void 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  */
  42 void dump_stack(void)
  43 {
  44         unsigned long stack;
  45
  46         show_trace(current, &stack);
  47 }
  48 EXPORT_SYMBOL(dump_stack);
  49
  50 /*Stolen from arch/i386/kernel/traps.c */
  51 static 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.*/
  55 void 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 }