| 1 | |
| 2 | #include "marker.h" |
| 3 | #include <stdio.h> |
| 4 | |
| 5 | extern struct marker __start___markers[]; |
| 6 | extern struct marker __stop___markers[]; |
| 7 | |
| 8 | /** |
| 9 | * __mark_empty_function - Empty probe callback |
| 10 | * @probe_private: probe private data |
| 11 | * @call_private: call site private data |
| 12 | * @fmt: format string |
| 13 | * @...: variable argument list |
| 14 | * |
| 15 | * Empty callback provided as a probe to the markers. By providing this to a |
| 16 | * disabled marker, we make sure the execution flow is always valid even |
| 17 | * though the function pointer change and the marker enabling are two distinct |
| 18 | * operations that modifies the execution flow of preemptible code. |
| 19 | */ |
| 20 | void __mark_empty_function(void *probe_private, void *call_private, |
| 21 | const char *fmt, va_list *args) |
| 22 | { |
| 23 | } |
| 24 | |
| 25 | /* |
| 26 | * marker_probe_cb Callback that prepares the variable argument list for probes. |
| 27 | * @mdata: pointer of type struct marker |
| 28 | * @call_private: caller site private data |
| 29 | * @fmt: format string |
| 30 | * @...: Variable argument list. |
| 31 | * |
| 32 | */ |
| 33 | void marker_probe_cb(const struct marker *mdata, void *call_private, |
| 34 | const char *fmt, ...) |
| 35 | { |
| 36 | |
| 37 | |
| 38 | } |
| 39 | |
| 40 | __attribute__((constructor)) void marker_init(void) |
| 41 | { |
| 42 | struct marker *iter; |
| 43 | |
| 44 | printf("Marker section : from %p to %p\n", |
| 45 | __start___markers, __stop___markers); |
| 46 | for (iter = __start___markers; iter < __stop___markers; iter++) { |
| 47 | printf("Marker : %s\n", iter->name); |
| 48 | } |
| 49 | } |