arch/blackfin/kernel/kgdb_test.c

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