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