1 /*
2 * Copyright (c) 2017 Cyril Hrubis <chrubis@suse.cz>
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include <sys/personality.h>
19 #include <sys/utsname.h>
20 #include "test.h"
21 #include "tst_kernel.h"
22
get_kernel_bits_from_uname(struct utsname * buf)23 static int get_kernel_bits_from_uname(struct utsname *buf)
24 {
25 if (uname(buf)) {
26 tst_brkm(TBROK | TERRNO, NULL, "uname()");
27 return -1;
28 }
29
30 return strstr(buf->machine, "64") ? 64 : 32;
31 }
32
tst_kernel_bits(void)33 int tst_kernel_bits(void)
34 {
35 struct utsname buf;
36 int kernel_bits = get_kernel_bits_from_uname(&buf);
37
38 if (kernel_bits == -1)
39 return -1;
40
41 /*
42 * ARM64 (aarch64) defines 32-bit compatibility modes as
43 * armv8l and armv8b (little and big endian).
44 * s390x is 64bit but not contain 64 in the words.
45 */
46 if (!strcmp(buf.machine, "armv8l") || !strcmp(buf.machine, "armv8b")
47 || !strcmp(buf.machine, "s390x"))
48 kernel_bits = 64;
49
50 #ifdef __ANDROID__
51 /* Android's bionic libc sets the PER_LINUX32 personality for all 32-bit
52 * programs. This will cause buf.machine to report as i686 even though
53 * the kernel itself is 64-bit.
54 */
55 if (!strcmp(buf.machine, "i686") &&
56 (personality(0xffffffff) & PER_MASK) == PER_LINUX32) {
57 /* Set the personality back to the default. */
58 if (personality(PER_LINUX) == -1) {
59 tst_brkm(TBROK | TERRNO, NULL, "personality()");
60 return -1;
61 }
62
63 /* Redo the uname check without the PER_LINUX32 personality to
64 * determine the actual kernel bits value.
65 */
66 kernel_bits = get_kernel_bits_from_uname(&buf);
67 if (kernel_bits == -1)
68 return -1;
69
70 /* Set the personality back to PER_LINUX32. */
71 if (personality(PER_LINUX32) == -1) {
72 tst_brkm(TBROK | TERRNO, NULL, "personality()");
73 return -1;
74 }
75 }
76 #endif /* __ANDROID__ */
77
78 tst_resm(TINFO, "uname.machine=%s kernel is %ibit",
79 buf.machine, kernel_bits);
80
81 return kernel_bits;
82 }
83
tst_check_driver(const char * name)84 int tst_check_driver(const char *name)
85 {
86 #ifndef __ANDROID__
87 const char * const argv[] = { "modprobe", "-n", name, NULL };
88 int res = tst_run_cmd_(NULL, argv, "/dev/null", "/dev/null", 1);
89
90 /* 255 - it looks like modprobe not available */
91 return (res == 255) ? 0 : res;
92 #else
93 /* Android modprobe may not have '-n', or properly installed
94 * module.*.bin files to determine built-in drivers. Assume
95 * all drivers are available.
96 */
97 return 0;
98 #endif
99 }
100