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Commit | Line | Data |
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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> | |
5a0e3ad6 | 5 | #include <linux/slab.h> |
21783c97 MS |
6 | #include <linux/types.h> |
7 | #include <asm/ptrace.h> | |
8 | #include <asm/uaccess.h> | |
9 | ||
10 | #define SAMPLE_BUFFER_SIZE 8192 | |
11 | ||
12 | static char* sample_buffer; | |
13 | static char* sample_buffer_pos; | |
14 | static int prof_running = 0; | |
15 | ||
16 | void | |
17 | cris_profile_sample(struct pt_regs* regs) | |
18 | { | |
542401d9 CG |
19 | if (!prof_running) |
20 | return; | |
21 | ||
22 | if (user_mode(regs)) | |
23 | *(unsigned int*)sample_buffer_pos = current->pid; | |
24 | else | |
25 | *(unsigned int*)sample_buffer_pos = 0; | |
26 | ||
27 | *(unsigned int*)(sample_buffer_pos + 4) = instruction_pointer(regs); | |
28 | sample_buffer_pos += 8; | |
29 | ||
30 | if (sample_buffer_pos == sample_buffer + SAMPLE_BUFFER_SIZE) | |
31 | sample_buffer_pos = sample_buffer; | |
21783c97 MS |
32 | } |
33 | ||
34 | static ssize_t | |
542401d9 CG |
35 | read_cris_profile(struct file *file, char __user *buf, |
36 | size_t count, loff_t *ppos) | |
21783c97 | 37 | { |
542401d9 | 38 | unsigned long p = *ppos; |
ed62f77b | 39 | ssize_t ret; |
542401d9 | 40 | |
ed62f77b AM |
41 | ret = simple_read_from_buffer(buf, count, ppos, sample_buffer, |
42 | SAMPLE_BUFFER_SIZE); | |
43 | if (ret < 0) | |
44 | return ret; | |
542401d9 | 45 | |
ed62f77b | 46 | memset(sample_buffer + p, 0, ret); |
542401d9 | 47 | |
ed62f77b | 48 | return ret; |
21783c97 MS |
49 | } |
50 | ||
51 | static ssize_t | |
52 | write_cris_profile(struct file *file, const char __user *buf, | |
542401d9 | 53 | size_t count, loff_t *ppos) |
21783c97 | 54 | { |
542401d9 CG |
55 | sample_buffer_pos = sample_buffer; |
56 | memset(sample_buffer, 0, SAMPLE_BUFFER_SIZE); | |
21783c97 MS |
57 | } |
58 | ||
5dfe4c96 | 59 | static const struct file_operations cris_proc_profile_operations = { |
21783c97 MS |
60 | .read = read_cris_profile, |
61 | .write = write_cris_profile, | |
62 | }; | |
63 | ||
64 | static int | |
65 | __init init_cris_profile(void) | |
66 | { | |
542401d9 CG |
67 | struct proc_dir_entry *entry; |
68 | ||
69 | sample_buffer = kmalloc(SAMPLE_BUFFER_SIZE, GFP_KERNEL); | |
70 | if (!sample_buffer) { | |
71 | return -ENOMEM; | |
72 | } | |
73 | ||
74 | sample_buffer_pos = sample_buffer; | |
75 | ||
c293819a DL |
76 | entry = proc_create("system_profile", S_IWUSR | S_IRUGO, NULL, |
77 | &cris_proc_profile_operations); | |
542401d9 | 78 | if (entry) { |
542401d9 CG |
79 | entry->size = SAMPLE_BUFFER_SIZE; |
80 | } | |
81 | prof_running = 1; | |
82 | ||
83 | return 0; | |
21783c97 MS |
84 | } |
85 | ||
86 | __initcall(init_cris_profile); |