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 typedef long (*getcpu_t)(unsigned int *, unsigned int *, void *); 20 21 int main(int argc, char **argv) 22 { 23 const char *version = versions[VDSO_VERSION]; 24 const char **name = (const char **)&names[VDSO_NAMES]; 25 unsigned long sysinfo_ehdr; 26 unsigned int cpu, node; 27 getcpu_t get_cpu; 28 long ret; 29 30 sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR); 31 if (!sysinfo_ehdr) { 32 printf("AT_SYSINFO_EHDR is not present!\n"); 33 return KSFT_SKIP; 34 } 35 36 vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR)); 37 38 get_cpu = (getcpu_t)vdso_sym(version, name[4]); 39 if (!get_cpu) { 40 printf("Could not find %s\n", name[4]); 41 return KSFT_SKIP; 42 } 43 44 ret = VDSO_CALL(get_cpu, 3, &cpu, &node, 0); 45 if (ret == 0) { 46 printf("Running on CPU %u node %u\n", cpu, node); 47 } else { 48 printf("%s failed\n", name[4]); 49 return KSFT_FAIL; 50 } 51 52 return 0; 53 } 54