LXR linux/arch/blackfin/kernel/kgdb

   1/*
   2 * arch/blackfin/kernel/kgdb_test.c - Blackfin kgdb tests
   3 *
   4 * Copyright 2005-2008 Analog Devices Inc.
   5 *
   6 * Licensed under the GPL-2 or later.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/proc_fs.h>
  13
  14#include <asm/current.h>
  15#include <asm/uaccess.h>
  16
  17#include <asm/blackfin.h>
  18
  19/* Symbols are here for kgdb test to poke directly */
  20static char cmdline[256];
  21static size_t len;
  22
  23#ifndef CONFIG_SMP
  24static int num1 __attribute__((l1_data));
  25
  26void kgdb_l1_test(void) __attribute__((l1_text));
  27
  28void kgdb_l1_test(void)
  29{
  30        pr_alert("L1(before change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
  31        pr_alert("L1 : code function addr = 0x%p\n", kgdb_l1_test);
  32        num1 = num1 + 10;
  33        pr_alert("L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
  34}
  35#endif
  36
  37#if L2_LENGTH
  38
  39static int num2 __attribute__((l2));
  40void kgdb_l2_test(void) __attribute__((l2));
  41
  42void kgdb_l2_test(void)
  43{
  44        pr_alert("L2(before change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
  45        pr_alert("L2 : code function addr = 0x%p\n", kgdb_l2_test);
  46        num2 = num2 + 20;
  47        pr_alert("L2(after change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
  48}
  49
  50#endif
  51
  52noinline int kgdb_test(char *name, int len, int count, int z)
  53{
  54        pr_alert("kgdb name(%d): %s, %d, %d\n", len, name, count, z);
  55        count = z;
  56        return count;
  57}
  58
  59static ssize_t
  60kgdb_test_proc_read(struct file *file, char __user *buf,
  61                    size_t count, loff_t *ppos)
  62{
  63        kgdb_test("hello world!", 12, 0x55, 0x10);
  64#ifndef CONFIG_SMP
  65        kgdb_l1_test();
  66#endif
  67#if L2_LENGTH
  68        kgdb_l2_test();
  69#endif
  70
  71        return 0;
  72}
  73
  74static ssize_t
  75kgdb_test_proc_write(struct file *file, const char __user *buffer,
  76                     size_t count, loff_t *pos)
  77{
  78        len = min_t(size_t, 255, count);
  79        memcpy(cmdline, buffer, count);
  80        cmdline[len] = 0;
  81
  82        return len;
  83}
  84
  85static const struct file_operations kgdb_test_proc_fops = {
  86        .owner = THIS_MODULE,
  87        .read  = kgdb_test_proc_read,
  88        .write = kgdb_test_proc_write,
  89        .llseek = noop_llseek,
  90};
  91
  92static int __init kgdbtest_init(void)
  93{
  94        struct proc_dir_entry *entry;
  95
  96#if L2_LENGTH
  97        num2 = 0;
  98#endif
  99
 100        entry = proc_create("kgdbtest", 0, NULL, &kgdb_test_proc_fops);
 101        if (entry == NULL)
 102                return -ENOMEM;
 103
 104        return 0;
 105}
 106
 107static void __exit kgdbtest_exit(void)
 108{
 109        remove_proc_entry("kgdbtest", NULL);
 110}
 111
 112module_init(kgdbtest_init);
 113module_exit(kgdbtest_exit);
 114MODULE_LICENSE("GPL");
 115