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 static char cmdline[256];
  21 static unsigned long 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         printk(KERN_ALERT "L1(before change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
  31         printk(KERN_ALERT "L1 : code function addr = 0x%p\n", kgdb_l1_test);
  32         num1 = num1 + 10 ;
  33         printk(KERN_ALERT "L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
  34         return ;
  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         printk(KERN_ALERT "L2(before change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
  46         printk(KERN_ALERT "L2 : code function addr = 0x%p\n", kgdb_l2_test);
  47         num2 = num2 + 20 ;
  48         printk(KERN_ALERT "L2(after change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
  49         return ;
  50 }
  51
  52 #endif
  53
  54
  55 int kgdb_test(char *name, int len, int count, int z)
  56 {
  57         printk(KERN_DEBUG "kgdb name(%d): %s, %d, %d\n", len, name, count, z);
  58         count = z;
  59         return count;
  60 }
  61
  62 static int test_proc_output(char *buf)
  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 int test_read_proc(char *page, char **start, off_t off,
  76                                  int count, int *eof, void *data)
  77 {
  78         int len;
  79
  80         len = test_proc_output(page);
  81         if (len <= off+count)
  82                 *eof = 1;
  83         *start = page + off;
  84         len -= off;
  85         if (len > count)
  86                 len = count;
  87         if (len < 0)
  88                 len = 0;
  89         return len;
  90 }
  91
  92 static int test_write_proc(struct file *file, const char *buffer,
  93                                  unsigned long count, void *data)
  94 {
  95         if (count >= 256)
  96                 len = 255;
  97         else
  98                 len = count;
  99
 100         memcpy(cmdline, buffer, count);
 101         cmdline[len] = 0;
 102
 103         return len;
 104 }
 105
 106 static int __init kgdbtest_init(void)
 107 {
 108         struct proc_dir_entry *entry;
 109
 110         entry = create_proc_entry("kgdbtest", 0, NULL);
 111         if (entry == NULL)
 112                 return -ENOMEM;
 113
 114         entry->read_proc = test_read_proc;
 115         entry->write_proc = test_write_proc;
 116         entry->data = NULL;
 117
 118         return 0;
 119 }
 120
 121 static void __exit kgdbtest_exit(void)
 122 {
 123         remove_proc_entry("kgdbtest", NULL);
 124 }
 125
 126 module_init(kgdbtest_init);
 127 module_exit(kgdbtest_exit);
 128 MODULE_LICENSE("GPL");