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vdso_test_correctness test fails on powerpc: ~ # ./vdso_test_correctness ... [RUN] Testing clock_gettime for clock CLOCK_REALTIME_ALARM (8)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 [RUN] Testing clock_gettime for clock CLOCK_BOOTTIME_ALARM (9)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 [RUN] Testing clock_gettime for clock CLOCK_SGI_CYCLE (10)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 ... [RUN] Testing clock_gettime for clock invalid (-1)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 [RUN] Testing clock_gettime for clock invalid (-2147483648)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 [RUN] Testing clock_gettime for clock invalid (2147483647)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 On powerpc, a call to a VDSO function is not an ordinary C function call. Unlike several architectures which returns a negative error code in case of an error, powerpc sets CR[SO] and returns the error code as a positive value. Define and use a macro called VDSO_CALL() which takes a pointer to the function to call, the number of arguments and the arguments. Also update ABI vdso documentation to reflect this subtlety. Provide a specific version of VDSO_CALL() for powerpc that negates the error code on return when CR[SO] is set. Fixes:c7e5789b24("kselftest: Move test_vdso to the vDSO test suite") Fixes:2e9a972566("selftests: vdso: Add a selftest for vDSO getcpu()") Fixes:693f5ca08c("kselftest: Extend vDSO selftest") Fixes:b2f1c3db28("kselftest: Extend vdso correctness test to clock_gettime64") Fixes:4920a2590e("selftests/vDSO: add tests for vgetrandom") Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* vdso_test_gettimeofday.c: Sample code to test parse_vdso.c and
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* vDSO gettimeofday()
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* Copyright (c) 2014 Andy Lutomirski
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*
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* Compile with:
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* gcc -std=gnu99 vdso_test_gettimeofday.c parse_vdso_gettimeofday.c
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*
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* Tested on x86, 32-bit and 64-bit. It may work on other architectures, too.
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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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#include "vdso_config.h"
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#include "vdso_call.h"
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int main(int argc, char **argv)
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{
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const char *version = versions[VDSO_VERSION];
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const char **name = (const char **)&names[VDSO_NAMES];
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unsigned long 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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/* Find gettimeofday. */
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typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz);
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gtod_t gtod = (gtod_t)vdso_sym(version, name[0]);
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if (!gtod) {
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printf("Could not find %s\n", name[0]);
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return KSFT_SKIP;
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}
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struct timeval tv;
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long ret = VDSO_CALL(gtod, 2, &tv, 0);
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if (ret == 0) {
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printf("The time is %lld.%06lld\n",
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(long long)tv.tv_sec, (long long)tv.tv_usec);
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} else {
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printf("%s failed\n", name[0]);
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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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