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