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kgdb_test.c

/*
 * 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/system.h>

#include <asm/blackfin.h>

static char cmdline[256];
static unsigned long len;

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

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

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

#if L2_LENGTH

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

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

#endif


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

static int test_proc_output(char *buf)
{
      kgdb_test("hello world!", 12, 0x55, 0x10);
#ifndef CONFIG_SMP
      kgdb_l1_test();
#endif
#if L2_LENGTH
      kgdb_l2_test();
#endif

      return 0;
}

static int test_read_proc(char *page, char **start, off_t off,
                         int count, int *eof, void *data)
{
      int len;

      len = test_proc_output(page);
      if (len <= off+count)
            *eof = 1;
      *start = page + off;
      len -= off;
      if (len > count)
            len = count;
      if (len < 0)
            len = 0;
      return len;
}

static int test_write_proc(struct file *file, const char *buffer,
                         unsigned long count, void *data)
{
      if (count >= 256)
            len = 255;
      else
            len = count;

      memcpy(cmdline, buffer, count);
      cmdline[len] = 0;

      return len;
}

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

      entry = create_proc_entry("kgdbtest", 0, NULL);
      if (entry == NULL)
            return -ENOMEM;

      entry->read_proc = test_read_proc;
      entry->write_proc = test_write_proc;
      entry->data = NULL;

      return 0;
}

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

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

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