xref: /openbmc/linux/tools/perf/tests/perf-hooks.c (revision 33f44bfd)
1 // SPDX-License-Identifier: GPL-2.0
2 #include <signal.h>
3 #include <stdlib.h>
4 
5 #include "tests.h"
6 #include "debug.h"
7 #include "perf-hooks.h"
8 
sigsegv_handler(int sig __maybe_unused)9 static void sigsegv_handler(int sig __maybe_unused)
10 {
11 	pr_debug("SIGSEGV is observed as expected, try to recover.\n");
12 	perf_hooks__recover();
13 	signal(SIGSEGV, SIG_DFL);
14 	raise(SIGSEGV);
15 	exit(-1);
16 }
17 
18 
the_hook(void * _hook_flags)19 static void the_hook(void *_hook_flags)
20 {
21 	int *hook_flags = _hook_flags;
22 
23 	*hook_flags = 1234;
24 
25 	/* Generate a segfault, test perf_hooks__recover */
26 	raise(SIGSEGV);
27 }
28 
test__perf_hooks(struct test_suite * test __maybe_unused,int subtest __maybe_unused)29 static int test__perf_hooks(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
30 {
31 	int hook_flags = 0;
32 
33 	signal(SIGSEGV, sigsegv_handler);
34 	perf_hooks__set_hook("test", the_hook, &hook_flags);
35 	perf_hooks__invoke_test();
36 
37 	/* hook is triggered? */
38 	if (hook_flags != 1234) {
39 		pr_debug("Setting failed: %d (%p)\n", hook_flags, &hook_flags);
40 		return TEST_FAIL;
41 	}
42 
43 	/* the buggy hook is removed? */
44 	if (perf_hooks__get_hook("test"))
45 		return TEST_FAIL;
46 	return TEST_OK;
47 }
48 
49 DEFINE_SUITE("perf hooks", perf_hooks);
50