| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * vdso_test_getcpu.c: Sample code to test parse_vdso.c and vDSO getcpu() |
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| 4 | * |
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| 5 | * Copyright (c) 2020 Arm Ltd |
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| 6 | */ |
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| 7 | |
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| 8 | #include <stdint.h> |
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| 9 | #include <elf.h> |
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| 10 | #include <stdio.h> |
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| 11 | #include <sys/auxv.h> |
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| 12 | #include <sys/time.h> |
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| 13 | |
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| 14 | #include "../kselftest.h" |
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| 15 | #include "parse_vdso.h" |
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| 16 | |
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| 17 | #if defined(__riscv) |
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| 18 | const char *version = "LINUX_4.15" ; |
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| 19 | #else |
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| 20 | const char *version = "LINUX_2.6" ; |
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| 21 | #endif |
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| 22 | const char *name = "__vdso_getcpu" ; |
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| 23 | |
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| 24 | struct getcpu_cache; |
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| 25 | typedef long (*getcpu_t)(unsigned int *, unsigned int *, |
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| 26 | struct getcpu_cache *); |
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| 27 | |
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| 28 | int main(int argc, char **argv) |
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| 29 | { |
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| 30 | unsigned long sysinfo_ehdr; |
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| 31 | unsigned int cpu, node; |
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| 32 | getcpu_t get_cpu; |
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| 33 | long ret; |
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| 34 | |
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| 35 | sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR); |
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| 36 | if (!sysinfo_ehdr) { |
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| 37 | printf("AT_SYSINFO_EHDR is not present!\n" ); |
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| 38 | return KSFT_SKIP; |
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| 39 | } |
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| 40 | |
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| 41 | vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR)); |
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| 42 | |
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| 43 | get_cpu = (getcpu_t)vdso_sym(version, name); |
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| 44 | if (!get_cpu) { |
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| 45 | printf("Could not find %s\n" , name); |
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| 46 | return KSFT_SKIP; |
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| 47 | } |
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| 48 | |
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| 49 | ret = get_cpu(&cpu, &node, 0); |
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| 50 | if (ret == 0) { |
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| 51 | printf("Running on CPU %u node %u\n" , cpu, node); |
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| 52 | } else { |
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| 53 | printf("%s failed\n" , name); |
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| 54 | return KSFT_FAIL; |
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| 55 | } |
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| 56 | |
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| 57 | return 0; |
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| 58 | } |
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| 59 | |
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