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sysrq.c

/* 
 * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include "linux/sched.h"
#include "linux/kernel.h"
#include "linux/module.h"
#include "linux/kallsyms.h"
#include "asm/page.h"
#include "asm/processor.h"
#include "sysrq.h"

/* Catch non-i386 SUBARCH's. */
#if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
void show_trace(struct task_struct *task, unsigned long * stack)
{
        unsigned long addr;

        if (!stack) {
            stack = (unsigned long*) &stack;
            WARN_ON(1);
      }

        printk("Call Trace: \n");
        while (((long) stack & (THREAD_SIZE-1)) != 0) {
                addr = *stack;
            if (__kernel_text_address(addr)) {
                  printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
                  print_symbol(" %s", addr);
                  printk("\n");
                }
                stack++;
        }
        printk("\n");
}
#endif

/*
 * stack dumps generator - this is used by arch-independent code.
 * And this is identical to i386 currently.
 */
void dump_stack(void)
{
      unsigned long stack;

      show_trace(current, &stack);
}
EXPORT_SYMBOL(dump_stack);

/*Stolen from arch/i386/kernel/traps.c */
static const int kstack_depth_to_print = 24;

/* This recently started being used in arch-independent code too, as in
 * kernel/sched.c.*/
void show_stack(struct task_struct *task, unsigned long *esp)
{
      unsigned long *stack;
      int i;

      if (esp == NULL) {
            if (task != current && task != NULL) {
                  esp = (unsigned long *) KSTK_ESP(task);
            } else {
                  esp = (unsigned long *) &esp;
            }
      }

      stack = esp;
      for(i = 0; i < kstack_depth_to_print; i++) {
            if (kstack_end(stack))
                  break;
            if (i && ((i % 8) == 0))
                  printk("\n       ");
            printk("%08lx ", *stack++);
      }

      printk("Call Trace: \n");
      show_trace(task, esp);
}

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