selftests: vdso: Add a selftest for vDSO getcpu() (2e9a9725) · Commits · 戴 / test

tools/testing/selftests/vDSO/.gitignore

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		# SPDX-License-Identifier: GPL-2.0-only
		vdso_test
		vdso_test_gettimeofday
		vdso_test_getcpu
		vdso_standalone_test_x86

+2 −1

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		@@ -4,7 +4,7 @@ include ../lib.mk
		uname_M := $(shell uname -m 2>/dev/null \|\| echo not)
		ARCH ?= $(shell echo $(uname_M) \| sed -e s/i.86/x86/ -e s/x86_64/x86/)

		TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday
		TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday $(OUTPUT)/vdso_test_getcpu
		ifeq ($(ARCH),x86)
		TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86
		endif
		@@ -18,6 +18,7 @@ endif

		all: $(TEST_GEN_PROGS)
		$(OUTPUT)/vdso_test_gettimeofday: parse_vdso.c vdso_test_gettimeofday.c
		$(OUTPUT)/vdso_test_getcpu: parse_vdso.c vdso_test_getcpu.c
		$(OUTPUT)/vdso_standalone_test_x86: vdso_standalone_test_x86.c parse_vdso.c
		$(CC) $(CFLAGS) $(CFLAGS_vdso_standalone_test_x86) \
		vdso_standalone_test_x86.c parse_vdso.c \

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		// 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"

		const char *version = "LINUX_2.6";
		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;
		}