56 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * vdso_test_getcpu.c: Sample code to test parse_vdso.c and vDSO getcpu()4 *5 * Copyright (c) 2020 Arm Ltd6 */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#include "vdso_call.h"18 19struct getcpu_cache;20typedef long (*getcpu_t)(unsigned int *, unsigned int *,21 struct getcpu_cache *);22 23int main(int argc, char **argv)24{25 const char *version = versions[VDSO_VERSION];26 const char **name = (const char **)&names[VDSO_NAMES];27 unsigned long sysinfo_ehdr;28 unsigned int cpu, node;29 getcpu_t get_cpu;30 long ret;31 32 sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);33 if (!sysinfo_ehdr) {34 printf("AT_SYSINFO_EHDR is not present!\n");35 return KSFT_SKIP;36 }37 38 vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));39 40 get_cpu = (getcpu_t)vdso_sym(version, name[4]);41 if (!get_cpu) {42 printf("Could not find %s\n", name[4]);43 return KSFT_SKIP;44 }45 46 ret = VDSO_CALL(get_cpu, 3, &cpu, &node, 0);47 if (ret == 0) {48 printf("Running on CPU %u node %u\n", cpu, node);49 } else {50 printf("%s failed\n", name[4]);51 return KSFT_FAIL;52 }53 54 return 0;55}56