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21783c97 MS |
1 | #include <linux/init.h> |
2 | #include <linux/errno.h> | |
3 | #include <linux/kernel.h> | |
4 | #include <linux/proc_fs.h> | |
5 | #include <linux/types.h> | |
6 | #include <asm/ptrace.h> | |
7 | #include <asm/uaccess.h> | |
8 | ||
9 | #define SAMPLE_BUFFER_SIZE 8192 | |
10 | ||
11 | static char* sample_buffer; | |
12 | static char* sample_buffer_pos; | |
13 | static int prof_running = 0; | |
14 | ||
15 | void | |
16 | cris_profile_sample(struct pt_regs* regs) | |
17 | { | |
18 | if (!prof_running) | |
19 | return; | |
20 | if (user_mode(regs)) | |
21 | *(unsigned int*)sample_buffer_pos = current->pid; | |
22 | else | |
23 | *(unsigned int*)sample_buffer_pos = 0; | |
24 | *(unsigned int*)(sample_buffer_pos + 4) = instruction_pointer(regs); | |
25 | sample_buffer_pos += 8; | |
26 | if (sample_buffer_pos == sample_buffer + SAMPLE_BUFFER_SIZE) | |
27 | sample_buffer_pos = sample_buffer; | |
28 | } | |
29 | ||
30 | static ssize_t | |
31 | read_cris_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
32 | { | |
33 | unsigned long p = *ppos; | |
34 | if (p > SAMPLE_BUFFER_SIZE) | |
35 | return 0; | |
36 | if (p + count > SAMPLE_BUFFER_SIZE) | |
37 | count = SAMPLE_BUFFER_SIZE - p; | |
38 | if (copy_to_user(buf, sample_buffer + p,count)) | |
39 | return -EFAULT; | |
40 | memset(sample_buffer + p, 0, count); | |
41 | *ppos += count; | |
42 | return count; | |
43 | } | |
44 | ||
45 | static ssize_t | |
46 | write_cris_profile(struct file *file, const char __user *buf, | |
47 | size_t count, loff_t *ppos) | |
48 | { | |
49 | sample_buffer_pos = sample_buffer; | |
50 | memset(sample_buffer, 0, SAMPLE_BUFFER_SIZE); | |
51 | } | |
52 | ||
53 | static struct file_operations cris_proc_profile_operations = { | |
54 | .read = read_cris_profile, | |
55 | .write = write_cris_profile, | |
56 | }; | |
57 | ||
58 | static int | |
59 | __init init_cris_profile(void) | |
60 | { | |
61 | struct proc_dir_entry *entry; | |
5cbded58 | 62 | sample_buffer = kmalloc(SAMPLE_BUFFER_SIZE, GFP_KERNEL); |
21783c97 MS |
63 | sample_buffer_pos = sample_buffer; |
64 | entry = create_proc_entry("system_profile", S_IWUSR | S_IRUGO, NULL); | |
65 | if (entry) { | |
66 | entry->proc_fops = &cris_proc_profile_operations; | |
67 | entry->size = SAMPLE_BUFFER_SIZE; | |
68 | } | |
69 | prof_running = 1; | |
70 | return 0; | |
71 | } | |
72 | ||
73 | __initcall(init_cris_profile); |