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)
18const char *version = "LINUX_4.15";
19#else
20const char *version = "LINUX_2.6";
21#endif
22const char *name = "__vdso_getcpu";
23
24struct getcpu_cache;
25typedef long (*getcpu_t)(unsigned int *, unsigned int *,
26			 struct getcpu_cache *);
27
28int 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