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87 lines
3.1 KiB
87 lines
3.1 KiB
/* |
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* Copyright (C) 2013 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#include <errno.h> |
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#include <sys/cdefs.h> |
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#include <sys/utsname.h> |
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#include <gtest/gtest.h> |
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// getauxval() was only added as of glibc version 2.16. |
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// See: http://lwn.net/Articles/519085/ |
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// Don't try to compile this code on older glibc versions. |
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#if defined(__BIONIC__) |
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#define GETAUXVAL_CAN_COMPILE 1 |
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#elif defined(__GLIBC_PREREQ) |
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#if __GLIBC_PREREQ(2, 16) |
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#define GETAUXVAL_CAN_COMPILE 1 |
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#endif |
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#endif |
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#if defined(GETAUXVAL_CAN_COMPILE) |
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#include <sys/auxv.h> |
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#endif |
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TEST(getauxval, expected_values) { |
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#if defined(GETAUXVAL_CAN_COMPILE) |
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ASSERT_EQ(0UL, getauxval(AT_SECURE)); |
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ASSERT_EQ(getuid(), getauxval(AT_UID)); |
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ASSERT_EQ(geteuid(), getauxval(AT_EUID)); |
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ASSERT_EQ(getgid(), getauxval(AT_GID)); |
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ASSERT_EQ(getegid(), getauxval(AT_EGID)); |
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ASSERT_EQ(static_cast<unsigned long>(getpagesize()), getauxval(AT_PAGESZ)); |
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ASSERT_NE(0UL, getauxval(AT_PHDR)); |
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ASSERT_NE(0UL, getauxval(AT_PHNUM)); |
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ASSERT_NE(0UL, getauxval(AT_ENTRY)); |
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ASSERT_NE(0UL, getauxval(AT_PAGESZ)); |
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#else |
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GTEST_LOG_(INFO) << "This test requires a C library with getauxval.\n"; |
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#endif |
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} |
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TEST(getauxval, unexpected_values) { |
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#if defined(GETAUXVAL_CAN_COMPILE) |
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errno = 0; |
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ASSERT_EQ(0UL, getauxval(0xdeadbeef)); |
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ASSERT_EQ(ENOENT, errno); |
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#else |
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GTEST_LOG_(INFO) << "This test requires a C library with getauxval.\n"; |
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#endif |
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} |
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TEST(getauxval, arm_has_AT_HWCAP2) { |
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#if defined(__arm__) |
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// There are no known 32-bit processors that implement any of these instructions, so rather |
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// than require that OEMs backport kernel patches, let's just ignore old hardware. Strictly |
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// speaking this would be fooled by someone choosing to ship a 32-bit kernel on 64-bit hardware, |
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// but that doesn't seem very likely in 2016. |
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utsname u; |
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ASSERT_EQ(0, uname(&u)); |
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if (strcmp(u.machine, "aarch64") == 0) { |
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// If this test fails, apps that use getauxval to decide at runtime whether crypto hardware is |
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// available will incorrectly assume that it isn't, and will have really bad performance. |
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// If this test fails, ensure that you've enabled COMPAT_BINFMT_ELF in your kernel configuration. |
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// Note that 0 ("I don't support any of these things") is a legitimate response --- we need |
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// to check errno to see whether we got a "true" 0 or a "not found" 0. |
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errno = 0; |
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getauxval(AT_HWCAP2); |
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ASSERT_EQ(0, errno) << "64-bit kernel not reporting AT_HWCAP2 to 32-bit ARM process"; |
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return; |
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} |
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#endif |
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GTEST_LOG_(INFO) << "This test is only meaningful for 32-bit ARM code on 64-bit devices.\n"; |
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}
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