arch/um/kernel/sysrq.c

   1 /*
   2  * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/sched.h"
   7 #include "linux/kernel.h"
   8 #include "linux/module.h"
   9 #include "linux/kallsyms.h"
  10 #include "asm/page.h"
  11 #include "asm/processor.h"
  12 #include "sysrq.h"
  13
  14 /* Catch non-i386 SUBARCH's. */
  15 #if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
  16 void show_trace(struct task_struct *task, unsigned long * stack)
  17 {
  18         unsigned long addr;
  19
  20         if (!stack) {
  21                 stack = (unsigned long*) &stack;
  22                 WARN_ON(1);
  23         }
  24
  25         printk("Call Trace: \n");
  26         while (((long) stack & (THREAD_SIZE-1)) != 0) {
  27                 addr = *stack;
  28                 if (__kernel_text_address(addr)) {
  29                         printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
  30                         print_symbol(" %s", addr);
  31                         printk("\n");
  32                 }
  33                 stack++;
  34         }
  35         printk("\n");
  36 }
  37 #endif
  38
  39 /*
  40  * stack dumps generator - this is used by arch-independent code.
  41  * And this is identical to i386 currently.
  42  */
  43 void dump_stack(void)
  44 {
  45         unsigned long stack;
  46
  47         show_trace(current, &stack);
  48 }
  49 EXPORT_SYMBOL(dump_stack);
  50
  51 /*Stolen from arch/i386/kernel/traps.c */
  52 static const int kstack_depth_to_print = 24;
  53
  54 /* This recently started being used in arch-independent code too, as in
  55  * kernel/sched.c.*/
  56 void show_stack(struct task_struct *task, unsigned long *esp)
  57 {
  58         unsigned long *stack;
  59         int i;
  60
  61         if (esp == NULL) {
  62                 if (task != current && task != NULL) {
  63                         esp = (unsigned long *) KSTK_ESP(task);
  64                 } else {
  65                         esp = (unsigned long *) &esp;
  66                 }
  67         }
  68
  69         stack = esp;
  70         for(i = 0; i < kstack_depth_to_print; i++) {
  71                 if (kstack_end(stack))
  72                         break;
  73                 if (i && ((i % 8) == 0))
  74                         printk("\n       ");
  75                 printk("%08lx ", *stack++);
  76         }
  77
  78         printk("Call Trace: \n");
  79         show_trace(task, esp);
  80 }