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 */
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
kgdb_l1_test(void)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
kgdb_l2_test(void)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
kgdb_test(char * name,int len,int count,int z)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
kgdb_test_proc_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)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
kgdb_test_proc_write(struct file * file,const char __user * buffer,size_t count,loff_t * pos)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
kgdbtest_init(void)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
kgdbtest_exit(void)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");
115