1 /*
2  * Check decoding of perf_event_open syscall.
3  *
4  * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
5  * Copyright (c) 2016-2017 The strace developers.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. The name of the author may not be used to endorse or promote products
17  *    derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #include "tests.h"
32 #include <asm/unistd.h>
33 
34 #if defined(__NR_perf_event_open) && defined(HAVE_LINUX_PERF_EVENT_H)
35 
36 # include <limits.h>
37 # include <stdio.h>
38 # include <unistd.h>
39 
40 # include <linux/perf_event.h>
41 
42 # include "xlat.h"
43 # include "xlat/perf_event_open_flags.h"
44 
45 #if ULONG_MAX > UINT_MAX
46 #define LONG_STR_PREFIX "ffffffff"
47 #else
48 #define LONG_STR_PREFIX ""
49 #endif
50 
51 static const char *printaddr(void *ptr)
52 {
53 	static char buf[sizeof("0x") + sizeof(void *) * 2];
54 
55 	if (ptr == NULL)
56 		return "NULL";
57 
58 	snprintf(buf, sizeof(buf), "%#lx", (unsigned long)ptr);
59 
60 	return buf;
61 }
62 
63 int
64 main(void)
65 {
66 	TAIL_ALLOC_OBJECT_CONST_PTR(struct perf_event_attr, attr);
67 
68 	attr->type = PERF_TYPE_HARDWARE;
69 	attr->size = sizeof(*attr);
70 
71 	struct {
72 		struct perf_event_attr *attr;
73 		pid_t pid;
74 		int cpu;
75 		int group_fd;
76 		unsigned long flags;
77 		const char *flags_str;
78 	} args[] = {
79 		{ NULL,     0xfacef00d, 0xbadabba7, -1,
80 			(unsigned long) 0xFFFFFFFFFFFFFFFFLLU,
81 			"PERF_FLAG_FD_NO_GROUP|PERF_FLAG_FD_OUTPUT|"
82 			"PERF_FLAG_PID_CGROUP|PERF_FLAG_FD_CLOEXEC|"
83 			"0x" LONG_STR_PREFIX "fffffff0"
84 			},
85 		{ attr + 1, 0,          0,          0,
86 			0, "0" },
87 		{ attr,     -1,         -1,         1,
88 			PERF_FLAG_FD_CLOEXEC, "PERF_FLAG_FD_CLOEXEC" },
89 		{ attr - 1, -100,       100,        0xface1e55,
90 			PERF_FLAG_FD_NO_GROUP | PERF_FLAG_FD_OUTPUT |
91 			PERF_FLAG_PID_CGROUP | PERF_FLAG_FD_CLOEXEC,
92 			"PERF_FLAG_FD_NO_GROUP|PERF_FLAG_FD_OUTPUT|"
93 			"PERF_FLAG_PID_CGROUP|PERF_FLAG_FD_CLOEXEC" },
94 	};
95 	size_t i;
96 	int rc;
97 
98 	for (i = 0; i < ARRAY_SIZE(args); i++) {
99 		rc = syscall(__NR_perf_event_open, args[i].attr, args[i].pid,
100 			args[i].cpu, args[i].group_fd, args[i].flags);
101 		printf("perf_event_open(%s, %d, %d, %d, %s) = %s\n",
102 			printaddr(args[i].attr), args[i].pid, args[i].cpu,
103 			args[i].group_fd, args[i].flags_str, sprintrc(rc));
104 	}
105 
106 	puts("+++ exited with 0 +++");
107 	return 0;
108 }
109 
110 #else
111 
112 SKIP_MAIN_UNDEFINED("__NR_perf_event_open && HAVE_LINUX_PERF_EVENT_H");
113 
114 #endif
115