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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"))) |
7 | extern struct marker __start___markers[]; |
8 | |
9 | __attribute__ ((visibility ("protected"))) |
10 | extern struct marker __stop___markers[]; |
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11 | |
12 | /** |
13 | * __mark_empty_function - Empty probe callback |
14 | * @probe_private: probe private data |
15 | * @call_private: call site private data |
16 | * @fmt: format string |
17 | * @...: variable argument list |
18 | * |
19 | * Empty callback provided as a probe to the markers. By providing this to a |
20 | * disabled marker, we make sure the execution flow is always valid even |
21 | * though the function pointer change and the marker enabling are two distinct |
22 | * operations that modifies the execution flow of preemptible code. |
23 | */ |
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24 | __attribute__ ((visibility ("protected"))) |
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25 | void __mark_empty_function(void *probe_private, void *call_private, |
26 | const char *fmt, va_list *args) |
27 | { |
28 | } |
29 | |
30 | /* |
31 | * marker_probe_cb Callback that prepares the variable argument list for probes. |
32 | * @mdata: pointer of type struct marker |
33 | * @call_private: caller site private data |
34 | * @fmt: format string |
35 | * @...: Variable argument list. |
36 | * |
37 | */ |
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38 | __attribute__ ((visibility ("protected"))) |
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39 | void marker_probe_cb(const struct marker *mdata, void *call_private, |
40 | const char *fmt, ...) |
41 | { |
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42 | char buf[PAGE_SIZE]; |
43 | va_list ap; |
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44 | |
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45 | va_start(ap, fmt); |
46 | vsnprintf(buf, PAGE_SIZE-1, fmt, ap); |
47 | sys_trace(0, 0, buf); |
48 | va_end(ap); |
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49 | } |
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50 | |
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51 | //FIXME : imv_read won't work with optimized immediate values. |
52 | //will need to issue one sys_marker call for each immediate value. |
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53 | __attribute__ ((visibility ("protected"))) |
54 | void testip(void) |
55 | { |
56 | printf("addr : %p\n", __builtin_return_address(0)); |
57 | } |
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58 | |
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59 | __attribute__((constructor, visibility ("protected"))) |
60 | void marker_init(void) |
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61 | { |
62 | struct marker *iter; |
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63 | int ret; |
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64 | |
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65 | printf("Marker section : from %p to %p (init)\n", |
66 | __start___markers, __stop___markers); |
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67 | testip(); |
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68 | for (iter = __start___markers; iter < __stop___markers; iter++) { |
69 | printf("Marker : %s\n", iter->name); |
70 | ret = sys_marker(iter->name, iter->format, |
71 | &imv_read(iter->state), 1); |
72 | if (ret) |
73 | perror("Error connecting markers"); |
74 | } |
75 | } |
76 | |
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77 | __attribute__((destructor, visibility ("protected"))) |
78 | void marker_fini(void) |
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79 | { |
80 | struct marker *iter; |
81 | int ret; |
82 | |
83 | printf("Marker section : from %p to %p (fini)\n", |
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84 | __start___markers, __stop___markers); |
85 | for (iter = __start___markers; iter < __stop___markers; iter++) { |
86 | printf("Marker : %s\n", iter->name); |
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87 | ret = sys_marker(iter->name, iter->format, |
88 | &imv_read(iter->state), 0); |
89 | if (ret) |
90 | perror("Error disconnecting markers"); |
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91 | } |
92 | } |