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 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