sysrq.c

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/*
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/kallsyms.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <asm/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(KERN_INFO "Call Trace: \n");
    while (((long) stack & (THREAD_SIZE-1)) != 0) {
        addr = *stack;
        if (__kernel_text_address(addr)) {
            printk(KERN_INFO "%08lx:  [<%08lx>]",
                   (unsigned long) stack, addr);
            print_symbol(KERN_CONT " %s", addr);
            printk(KERN_CONT "\n");
        }
        stack++;
    }
    printk(KERN_INFO "\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(KERN_INFO "       ");
        printk(KERN_CONT "%08lx ", *stack++);
    }

    show_trace(task, esp);
}