1 /*
2  * Check decoding of SPARC-specific kern_features syscall.
3  *
4  * Copyright (c) 2018 The strace developers.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  *    derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include "tests.h"
31 
32 #include <asm/unistd.h>
33 
34 #include "raw_syscall.h"
35 #include "scno.h"
36 
37 #if defined __NR_kern_features && defined raw_syscall_0
38 
39 # include <errno.h>
40 # include <stdio.h>
41 # include <stdlib.h>
42 # include <unistd.h>
43 
44 static void
45 test_kern_features(unsigned int num)
46 {
47 	/* The expected return codes, as enforced by fault injection */
48 	static struct {
49 		kernel_ulong_t ret;
50 		const char *str;
51 	} checks[] = {
52 		{ 0, NULL },
53 		{ 1, "KERN_FEATURE_MIXED_MODE_STACK" },
54 		{ 2, "0x2" },
55 		{ 0x7ffffffe, "0x7ffffffe" },
56 		{ 0x7fffffff, "KERN_FEATURE_MIXED_MODE_STACK|0x7ffffffe" },
57 		{ (kernel_ulong_t) 0xbadc0deddeadfaceULL,
58 			sizeof(kernel_ulong_t) == 8 ?
59 			"0xbadc0deddeadface" : "0xdeadface" },
60 		{ (kernel_ulong_t) -1ULL,
61 			sizeof(kernel_ulong_t) == 8 ?
62 			"KERN_FEATURE_MIXED_MODE_STACK|0xfffffffffffffffe" :
63 			"KERN_FEATURE_MIXED_MODE_STACK|0xfffffffe" },
64 	};
65 
66 	kernel_ulong_t err = 0;
67 	kernel_ulong_t rc = raw_syscall_0(__NR_kern_features, &err);
68 
69 	if (err) {
70 		errno = rc;
71 		printf("kern_features() = %s\n", sprintrc(-1));
72 		return;
73 	}
74 
75 	printf("kern_features() = %#llx", (unsigned long long) rc);
76 
77 	if (num < ARRAY_SIZE(checks)) {
78 		if (rc != checks[num].ret)
79 			error_msg_and_fail("Expected return value (%llx) "
80 					   "doesn't match expected one (%#llx)",
81 					   (unsigned long long) rc,
82 					   (unsigned long long) checks[num].ret);
83 
84 		if (checks[num].str)
85 			printf(" (%s)", checks[num].str);
86 
87 		printf(" (INJECTED)");
88 	} else if (rc) {
89 		printf(" (");
90 
91 		if (rc & 1)
92 			printf("KERN_FEATURE_MIXED_MODE_STACK");
93 
94 		if (rc & ~1ULL) {
95 			if (rc & 1)
96 				printf("|");
97 
98 			printf("%#llx", rc & ~1ULL);
99 		}
100 
101 		printf(")");
102 	}
103 
104 	puts("");
105 }
106 
107 int
108 main(int ac, char **av)
109 {
110 	test_kern_features(ac > 1 ? atoi(av[1]) : -1);
111 
112 	puts("+++ exited with 0 +++");
113 	return 0;
114 }
115 
116 #else
117 
118 SKIP_MAIN_UNDEFINED("__NR_kern_features && raw_syscall_0");
119 
120 #endif
121