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1 | /* test-mark.c |
2 | * |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/proc_fs.h> |
7 | #include <linux/sched.h> |
8 | #include <linux/timex.h> |
9 | #include <linux/marker.h> |
10 | #include <asm/ptrace.h> |
11 | static void noinline test2(const struct marker *mdata, |
12 | void *call_private, ...) |
13 | { |
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14 | unsigned char *ins = __builtin_return_address(0) - 5; |
15 | #if 0 |
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16 | /* not called */ |
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17 | printk("ip %p\n", __builtin_return_address(0)); |
18 | printk("prev_ins %hX %hX %hX %hX %hX\n", |
19 | ins[0], ins[1], ins[2], ins[3], ins[4]); |
20 | #endif //0 |
21 | ins[0] = 0x90; |
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22 | ins[1] = 0x8d; |
23 | ins[2] = 0x74; |
24 | ins[3] = 0x26; |
25 | ins[4] = 0x00; |
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26 | } |
27 | |
28 | /* |
29 | * Generic marker flavor always available. |
30 | * Note : the empty asm volatile with read constraint is used here instead of a |
31 | * "used" attribute to fix a gcc 4.1.x bug. |
32 | * Make sure the alignment of the structure in the __markers section will |
33 | * not add unwanted padding between the beginning of the section and the |
34 | * structure. Force alignment to the same alignment as the section start. |
35 | */ |
36 | #define __my_trace_mark(generic, name, call_private, format, args...) \ |
37 | do { \ |
38 | static const char __mstrtab_##name[] \ |
39 | __attribute__((section("__markers_strings"))) \ |
40 | = #name "\0" format; \ |
41 | static struct marker __mark_##name \ |
42 | __attribute__((section("__markers"), aligned(8))) = \ |
43 | { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)], \ |
44 | 0, 0, marker_probe_cb, \ |
45 | { __mark_empty_function, NULL}, NULL }; \ |
46 | __mark_check_format(format, ## args); \ |
47 | if (!generic) { \ |
48 | if (unlikely(imv_read(__mark_##name.state))) \ |
49 | test2 \ |
50 | (&__mark_##name, call_private, \ |
51 | ## args); \ |
52 | } else { \ |
53 | if (unlikely(_imv_read(__mark_##name.state))) \ |
54 | test2 \ |
55 | (&__mark_##name, call_private, \ |
56 | ## args); \ |
57 | } \ |
58 | } while (0) |
59 | |
60 | //asm volatile (""); |
61 | struct proc_dir_entry *pentry = NULL; |
62 | |
63 | static inline void test(unsigned long arg, unsigned long arg2) |
64 | { |
65 | //asm volatile (""); |
66 | //__my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
67 | test2(NULL, NULL, 2, current->pid, arg, arg2); |
68 | //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
69 | } |
70 | |
71 | static int my_open(struct inode *inode, struct file *file) |
72 | { |
73 | unsigned int i; |
74 | cycles_t cycles1, cycles2; |
75 | unsigned long flags; |
76 | |
77 | local_irq_save(flags); |
78 | rdtsc_barrier(); |
79 | cycles1 = get_cycles(); |
80 | rdtsc_barrier(); |
81 | for(i=0; i<20000; i++) { |
82 | test(i, i); |
83 | } |
84 | rdtsc_barrier(); |
85 | cycles2 = get_cycles(); |
86 | rdtsc_barrier(); |
87 | local_irq_restore(flags); |
88 | printk("cycles : %llu\n", cycles2-cycles1); |
89 | return -EPERM; |
90 | } |
91 | |
92 | |
93 | static struct file_operations my_operations = { |
94 | .open = my_open, |
95 | }; |
96 | |
97 | int init_module(void) |
98 | { |
99 | pentry = create_proc_entry("testmark", 0444, NULL); |
100 | if (pentry) |
101 | pentry->proc_fops = &my_operations; |
102 | |
103 | return 0; |
104 | } |
105 | |
106 | void cleanup_module(void) |
107 | { |
108 | remove_proc_entry("testmark", NULL); |
109 | } |
110 | |
111 | MODULE_LICENSE("GPL"); |
112 | MODULE_AUTHOR("Mathieu Desnoyers"); |
113 | MODULE_DESCRIPTION("Marker Test"); |
114 | |