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 <linux/uaccess.h>
  16
  17 #include <asm/blackfin.h>
  18
  19 /* Symbols are here for kgdb test to poke directly */
  20 static char cmdline[256];
  21 static size_t len;
  22
  23 #ifndef CONFIG_SMP
  24 static int num1 __attribute__((l1_data));
  25
  26 void kgdb_l1_test(void) __attribute__((l1_text));
  27
  28 void 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
  39 static int num2 __attribute__((l2));
  40 void kgdb_l2_test(void) __attribute__((l2));
  41
  42 void 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
  52 noinline 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
  59 static ssize_t
  60 kgdb_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
  74 static ssize_t
  75 kgdb_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
  85 static 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
  92 static 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
 107 static void __exit kgdbtest_exit(void)
 108 {
 109         remove_proc_entry("kgdbtest", NULL);
 110 }
 111
 112 module_init(kgdbtest_init);
 113 module_exit(kgdbtest_exit);
 114 MODULE_LICENSE("GPL");