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
17 #if defined(__riscv)
18 const char *version = "LINUX_4.15";
19 #else
20 const char *version = "LINUX_2.6";
21 #endif
22 const char *name = "__vdso_getcpu";
23
24 struct getcpu_cache;
25 typedef long (*getcpu_t)(unsigned int *, unsigned int *,
26 struct getcpu_cache *);
27
main(int argc,char ** argv)28 int main(int argc, char **argv)
29 {
30 unsigned long sysinfo_ehdr;
31 unsigned int cpu, node;
32 getcpu_t get_cpu;
33 long ret;
34
35 sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
36 if (!sysinfo_ehdr) {
37 printf("AT_SYSINFO_EHDR is not present!\n");
38 return KSFT_SKIP;
39 }
40
41 vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
42
43 get_cpu = (getcpu_t)vdso_sym(version, name);
44 if (!get_cpu) {
45 printf("Could not find %s\n", name);
46 return KSFT_SKIP;
47 }
48
49 ret = get_cpu(&cpu, &node, 0);
50 if (ret == 0) {
51 printf("Running on CPU %u node %u\n", cpu, node);
52 } else {
53 printf("%s failed\n", name);
54 return KSFT_FAIL;
55 }
56
57 return 0;
58 }
59