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 #include "vdso_config.h" 17 #include "vdso_call.h" 18 19 struct getcpu_cache; 20 typedef long (*getcpu_t)(unsigned int *, unsigned int *, 21 struct getcpu_cache *); 22 23 int 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