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1 | |
2 | #include "marker.h" |
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3 | #include <stdio.h> |
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4 | #include <errno.h> |
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5 | |
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6 | __attribute__ ((visibility ("protected"))) extern struct marker __start___markers[]; |
7 | __attribute__ ((visibility ("protected"))) extern struct marker __stop___markers[]; |
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8 | |
9 | /** |
10 | * __mark_empty_function - Empty probe callback |
11 | * @probe_private: probe private data |
12 | * @call_private: call site private data |
13 | * @fmt: format string |
14 | * @...: variable argument list |
15 | * |
16 | * Empty callback provided as a probe to the markers. By providing this to a |
17 | * disabled marker, we make sure the execution flow is always valid even |
18 | * though the function pointer change and the marker enabling are two distinct |
19 | * operations that modifies the execution flow of preemptible code. |
20 | */ |
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21 | __attribute__ ((visibility ("protected"))) |
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22 | void __mark_empty_function(void *probe_private, void *call_private, |
23 | const char *fmt, va_list *args) |
24 | { |
25 | } |
26 | |
27 | /* |
28 | * marker_probe_cb Callback that prepares the variable argument list for probes. |
29 | * @mdata: pointer of type struct marker |
30 | * @call_private: caller site private data |
31 | * @fmt: format string |
32 | * @...: Variable argument list. |
33 | * |
34 | */ |
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35 | __attribute__ ((visibility ("protected"))) |
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36 | void marker_probe_cb(const struct marker *mdata, void *call_private, |
37 | const char *fmt, ...) |
38 | { |
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39 | static unsigned int count = 0; |
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40 | |
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41 | printf("Test probe function %u\n", count++); |
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42 | } |
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43 | |
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44 | //FIXME : imv_read won't work with optimized immediate values. |
45 | //will need to issue one sys_marker call for each immediate value. |
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46 | __attribute__ ((visibility ("protected"))) |
47 | void testip(void) |
48 | { |
49 | printf("addr : %p\n", __builtin_return_address(0)); |
50 | } |
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51 | |
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52 | __attribute__((constructor, visibility ("protected"))) void marker_init(void) |
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53 | { |
54 | struct marker *iter; |
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55 | int ret; |
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56 | |
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57 | printf("Marker section : from %p to %p (init)\n", |
58 | __start___markers, __stop___markers); |
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59 | testip(); |
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60 | for (iter = __start___markers; iter < __stop___markers; iter++) { |
61 | printf("Marker : %s\n", iter->name); |
62 | ret = sys_marker(iter->name, iter->format, |
63 | &imv_read(iter->state), 1); |
64 | if (ret) |
65 | perror("Error connecting markers"); |
66 | } |
67 | } |
68 | |
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69 | static __attribute__((destructor, visibility ("protected"))) void marker_fini(void) |
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70 | { |
71 | struct marker *iter; |
72 | int ret; |
73 | |
74 | printf("Marker section : from %p to %p (fini)\n", |
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75 | __start___markers, __stop___markers); |
76 | for (iter = __start___markers; iter < __stop___markers; iter++) { |
77 | printf("Marker : %s\n", iter->name); |
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78 | ret = sys_marker(iter->name, iter->format, |
79 | &imv_read(iter->state), 0); |
80 | if (ret) |
81 | perror("Error disconnecting markers"); |
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82 | } |
83 | } |