// SPDX-License-Identifier: GPL-2.0-only /* * vdso_test_getcpu.c: Sample code to test parse_vdso.c and vDSO getcpu() * * Copyright (c) 2020 Arm Ltd */ #include <stdint.h> #include <elf.h> #include <stdio.h> #include <sys/auxv.h> #include <sys/time.h> #include "../kselftest.h" #include "parse_vdso.h" #if defined(__riscv) const char *version = "LINUX_4.15"; #else const char *version = "LINUX_2.6"; #endif const char *name = "__vdso_getcpu"; struct getcpu_cache; typedef long (*getcpu_t)(unsigned int *, unsigned int *, struct getcpu_cache *); int main(int argc, char **argv) { unsigned long sysinfo_ehdr; unsigned int cpu, node; getcpu_t get_cpu; long ret; sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR); if (!sysinfo_ehdr) { printf("AT_SYSINFO_EHDR is not present!\n"); return KSFT_SKIP; } vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR)); get_cpu = (getcpu_t)vdso_sym(version, name); if (!get_cpu) { printf("Could not find %s\n", name); return KSFT_SKIP; } ret = get_cpu(&cpu, &node, 0); if (ret == 0) { printf("Running on CPU %u node %u\n", cpu, node); } else { printf("%s failed\n", name); return KSFT_FAIL; } return 0; }