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 #include "user_util.h"
  14
  15 /* Catch non-i386 SUBARCH's. */
  16 #if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
  17 void show_trace(struct task_struct *task, unsigned long * stack)
  18 {
  19         unsigned long addr;
  20
  21         if (!stack) {
  22                 stack = (unsigned long*) &stack;
  23                 WARN_ON(1);
  24         }
  25
  26         printk("Call Trace: \n");
  27         while (((long) stack & (THREAD_SIZE-1)) != 0) {
  28                 addr = *stack;
  29                 if (__kernel_text_address(addr)) {
  30                         printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
  31                         print_symbol(" %s", addr);
  32                         printk("\n");
  33                 }
  34                 stack++;
  35         }
  36         printk("\n");
  37 }
  38 #endif
  39
  40 /*
  41  * stack dumps generator - this is used by arch-independent code.
  42  * And this is identical to i386 currently.
  43  */
  44 void dump_stack(void)
  45 {
  46         unsigned long stack;
  47
  48         show_trace(current, &stack);
  49 }
  50 EXPORT_SYMBOL(dump_stack);
  51
  52 /*Stolen from arch/i386/kernel/traps.c */
  53 static int kstack_depth_to_print = 24;
  54
  55 /* This recently started being used in arch-independent code too, as in
  56  * kernel/sched.c.*/
  57 void show_stack(struct task_struct *task, unsigned long *esp)
  58 {
  59         unsigned long *stack;
  60         int i;
  61
  62         if (esp == NULL) {
  63                 if (task != current && task != NULL) {
  64                         esp = (unsigned long *) KSTK_ESP(task);
  65                 } else {
  66                         esp = (unsigned long *) &esp;
  67                 }
  68         }
  69
  70         stack = esp;
  71         for(i = 0; i < kstack_depth_to_print; i++) {
  72                 if (kstack_end(stack))
  73                         break;
  74                 if (i && ((i % 8) == 0))
  75                         printk("\n       ");
  76                 printk("%08lx ", *stack++);
  77         }
  78
  79         printk("Call Trace: \n");
  80         show_trace(task, esp);
  81 }