1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * vdso_test_getcpu.c: Sample code to test parse_vdso.c and vDSO getcpu()
4 *
5 * Copyright (c) 2020 Arm Ltd
6 */
7
8 #include <stdint.h>
9 #include <elf.h>
10 #include <stdio.h>
11 #include <sys/auxv.h>
12 #include <sys/time.h>
13
14 #include "../kselftest.h"
15 #include "parse_vdso.h"
16 #include "vdso_config.h"
17
18 struct getcpu_cache;
19 typedef long (*getcpu_t)(unsigned int *, unsigned int *,
20 struct getcpu_cache *);
21
22 int main(int argc, char **argv)
23 {
24 const char *version = versions[VDSO_VERSION];
25 const char **name = (const char **)&names[VDSO_NAMES];
26 unsigned long sysinfo_ehdr;
27 unsigned int cpu, node;
28 getcpu_t get_cpu;
29 long ret;
30
31 sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
32 if (!sysinfo_ehdr) {
33 printf("AT_SYSINFO_EHDR is not present!\n");
34 return KSFT_SKIP;
35 }
36
37 vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
38
39 get_cpu = (getcpu_t)vdso_sym(version, name[4]);
40 if (!get_cpu) {
41 printf("Could not find %s\n", name[4]);
42 return KSFT_SKIP;
43 }
44
45 ret = get_cpu(&cpu, &node, 0);
46 if (ret == 0) {
47 printf("Running on CPU %u node %u\n", cpu, node);
48 } else {
49 printf("%s failed\n", name[4]);
50 return KSFT_FAIL;
51 }
52
53 return 0;
54 }
55
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