kgdb_test.c

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/*
 * arch/blackfin/kernel/kgdb_test.c - Blackfin kgdb tests
 *
 * Copyright 2005-2008 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>

#include <asm/current.h>
#include <asm/uaccess.h>

#include <asm/blackfin.h>

/* Symbols are here for kgdb test to poke directly */
static char cmdline[256];
static size_t len;

#ifndef CONFIG_SMP
static int num1 __attribute__((l1_data));

void kgdb_l1_test(void) __attribute__((l1_text));

void kgdb_l1_test(void)
{
    pr_alert("L1(before change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
    pr_alert("L1 : code function addr = 0x%p\n", kgdb_l1_test);
    num1 = num1 + 10;
    pr_alert("L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
}
#endif

#if L2_LENGTH

static int num2 __attribute__((l2));
void kgdb_l2_test(void) __attribute__((l2));

void kgdb_l2_test(void)
{
    pr_alert("L2(before change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
    pr_alert("L2 : code function addr = 0x%p\n", kgdb_l2_test);
    num2 = num2 + 20;
    pr_alert("L2(after change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
}

#endif

noinline int kgdb_test(char *name, int len, int count, int z)
{
    pr_alert("kgdb name(%d): %s, %d, %d\n", len, name, count, z);
    count = z;
    return count;
}

static ssize_t
kgdb_test_proc_read(struct file *file, char __user *buf,
                    size_t count, loff_t *ppos)
{
    kgdb_test("hello world!", 12, 0x55, 0x10);
#ifndef CONFIG_SMP
    kgdb_l1_test();
#endif
#if L2_LENGTH
    kgdb_l2_test();
#endif

    return 0;
}

static ssize_t
kgdb_test_proc_write(struct file *file, const char __user *buffer,
                     size_t count, loff_t *pos)
{
    len = min_t(size_t, 255, count);
    memcpy(cmdline, buffer, count);
    cmdline[len] = 0;

    return len;
}

static const struct file_operations kgdb_test_proc_fops = {
    .owner = THIS_MODULE,
    .read  = kgdb_test_proc_read,
    .write = kgdb_test_proc_write,
    .llseek = noop_llseek,
};

static int __init kgdbtest_init(void)
{
    struct proc_dir_entry *entry;

#if L2_LENGTH
    num2 = 0;
#endif

    entry = proc_create("kgdbtest", 0, NULL, &kgdb_test_proc_fops);
    if (entry == NULL)
        return -ENOMEM;

    return 0;
}

static void __exit kgdbtest_exit(void)
{
    remove_proc_entry("kgdbtest", NULL);
}

module_init(kgdbtest_init);
module_exit(kgdbtest_exit);
MODULE_LICENSE("GPL");