1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * vdso_test_getcpu.c: Sample code to test parse_vdso.c and vDSO getcpu()
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2020 Arm Ltd
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <stdint.h>
9*4882a593Smuzhiyun #include <elf.h>
10*4882a593Smuzhiyun #include <stdio.h>
11*4882a593Smuzhiyun #include <sys/auxv.h>
12*4882a593Smuzhiyun #include <sys/time.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "../kselftest.h"
15*4882a593Smuzhiyun #include "parse_vdso.h"
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun const char *version = "LINUX_2.6";
18*4882a593Smuzhiyun const char *name = "__vdso_getcpu";
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun struct getcpu_cache;
21*4882a593Smuzhiyun typedef long (*getcpu_t)(unsigned int *, unsigned int *,
22*4882a593Smuzhiyun struct getcpu_cache *);
23*4882a593Smuzhiyun
main(int argc,char ** argv)24*4882a593Smuzhiyun int main(int argc, char **argv)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun unsigned long sysinfo_ehdr;
27*4882a593Smuzhiyun unsigned int cpu, node;
28*4882a593Smuzhiyun getcpu_t get_cpu;
29*4882a593Smuzhiyun long ret;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
32*4882a593Smuzhiyun if (!sysinfo_ehdr) {
33*4882a593Smuzhiyun printf("AT_SYSINFO_EHDR is not present!\n");
34*4882a593Smuzhiyun return KSFT_SKIP;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun get_cpu = (getcpu_t)vdso_sym(version, name);
40*4882a593Smuzhiyun if (!get_cpu) {
41*4882a593Smuzhiyun printf("Could not find %s\n", name);
42*4882a593Smuzhiyun return KSFT_SKIP;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun ret = get_cpu(&cpu, &node, 0);
46*4882a593Smuzhiyun if (ret == 0) {
47*4882a593Smuzhiyun printf("Running on CPU %u node %u\n", cpu, node);
48*4882a593Smuzhiyun } else {
49*4882a593Smuzhiyun printf("%s failed\n", name);
50*4882a593Smuzhiyun return KSFT_FAIL;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun return 0;
54*4882a593Smuzhiyun }
55