1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "elf_file.h" 18 19 #include "base/unix_file/fd_file.h" 20 #include "common_compiler_test.h" 21 #include "elf_file.h" 22 #include "elf_file_impl.h" 23 #include "elf_builder.h" 24 #include "elf_writer_quick.h" 25 #include "oat.h" 26 #include "utils.h" 27 28 namespace art { 29 30 class ElfWriterTest : public CommonCompilerTest { 31 protected: 32 virtual void SetUp() { 33 ReserveImageSpace(); 34 CommonCompilerTest::SetUp(); 35 } 36 }; 37 38 #define EXPECT_ELF_FILE_ADDRESS(ef, expected_value, symbol_name, build_map) \ 39 do { \ 40 void* addr = reinterpret_cast<void*>((ef)->FindSymbolAddress(SHT_DYNSYM, \ 41 symbol_name, \ 42 build_map)); \ 43 EXPECT_NE(nullptr, addr); \ 44 if ((expected_value) == nullptr) { \ 45 (expected_value) = addr; \ 46 } \ 47 EXPECT_EQ(expected_value, addr); \ 48 EXPECT_EQ(expected_value, (ef)->FindDynamicSymbolAddress(symbol_name)); \ 49 } while (false) 50 51 TEST_F(ElfWriterTest, dlsym) { 52 std::string elf_location = GetCoreOatLocation(); 53 std::string elf_filename = GetSystemImageFilename(elf_location.c_str(), kRuntimeISA); 54 LOG(INFO) << "elf_filename=" << elf_filename; 55 56 UnreserveImageSpace(); 57 void* dl_oatdata = nullptr; 58 void* dl_oatexec = nullptr; 59 void* dl_oatlastword = nullptr; 60 61 std::unique_ptr<File> file(OS::OpenFileForReading(elf_filename.c_str())); 62 ASSERT_TRUE(file.get() != nullptr) << elf_filename; 63 { 64 std::string error_msg; 65 std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), 66 false, 67 false, 68 /*low_4gb*/false, 69 &error_msg)); 70 CHECK(ef.get() != nullptr) << error_msg; 71 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatdata, "oatdata", false); 72 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatexec, "oatexec", false); 73 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatlastword, "oatlastword", false); 74 } 75 { 76 std::string error_msg; 77 std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), 78 false, 79 false, 80 /*low_4gb*/false, 81 &error_msg)); 82 CHECK(ef.get() != nullptr) << error_msg; 83 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatdata, "oatdata", true); 84 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatexec, "oatexec", true); 85 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatlastword, "oatlastword", true); 86 } 87 { 88 uint8_t* base = reinterpret_cast<uint8_t*>(ART_BASE_ADDRESS); 89 std::string error_msg; 90 std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), 91 false, 92 true, 93 /*low_4gb*/false, 94 &error_msg, 95 base)); 96 CHECK(ef.get() != nullptr) << error_msg; 97 CHECK(ef->Load(file.get(), false, /*low_4gb*/false, &error_msg)) << error_msg; 98 EXPECT_EQ(reinterpret_cast<uintptr_t>(dl_oatdata) + reinterpret_cast<uintptr_t>(base), 99 reinterpret_cast<uintptr_t>(ef->FindDynamicSymbolAddress("oatdata"))); 100 EXPECT_EQ(reinterpret_cast<uintptr_t>(dl_oatexec) + reinterpret_cast<uintptr_t>(base), 101 reinterpret_cast<uintptr_t>(ef->FindDynamicSymbolAddress("oatexec"))); 102 EXPECT_EQ(reinterpret_cast<uintptr_t>(dl_oatlastword) + reinterpret_cast<uintptr_t>(base), 103 reinterpret_cast<uintptr_t>(ef->FindDynamicSymbolAddress("oatlastword"))); 104 } 105 } 106 107 TEST_F(ElfWriterTest, CheckBuildIdPresent) { 108 std::string elf_location = GetCoreOatLocation(); 109 std::string elf_filename = GetSystemImageFilename(elf_location.c_str(), kRuntimeISA); 110 LOG(INFO) << "elf_filename=" << elf_filename; 111 112 std::unique_ptr<File> file(OS::OpenFileForReading(elf_filename.c_str())); 113 ASSERT_TRUE(file.get() != nullptr); 114 { 115 std::string error_msg; 116 std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), 117 false, 118 false, 119 /*low_4gb*/false, 120 &error_msg)); 121 CHECK(ef.get() != nullptr) << error_msg; 122 EXPECT_TRUE(ef->HasSection(".note.gnu.build-id")); 123 } 124 } 125 126 TEST_F(ElfWriterTest, EncodeDecodeOatPatches) { 127 const std::vector<std::vector<uintptr_t>> test_data { 128 { 0, 4, 8, 15, 128, 200 }, 129 { 8, 8 + 127 }, 130 { 8, 8 + 128 }, 131 { }, 132 }; 133 for (const auto& patch_locations : test_data) { 134 constexpr int32_t delta = 0x11235813; 135 136 // Encode patch locations. 137 std::vector<uint8_t> oat_patches; 138 ElfBuilder<ElfTypes32>::EncodeOatPatches(ArrayRef<const uintptr_t>(patch_locations), 139 &oat_patches); 140 141 // Create buffer to be patched. 142 std::vector<uint8_t> initial_data(256); 143 for (size_t i = 0; i < initial_data.size(); i++) { 144 initial_data[i] = i; 145 } 146 147 // Patch manually. 148 std::vector<uint8_t> expected = initial_data; 149 for (uintptr_t location : patch_locations) { 150 typedef __attribute__((__aligned__(1))) uint32_t UnalignedAddress; 151 *reinterpret_cast<UnalignedAddress*>(expected.data() + location) += delta; 152 } 153 154 // Decode and apply patch locations. 155 std::vector<uint8_t> actual = initial_data; 156 ElfFileImpl32::ApplyOatPatches( 157 oat_patches.data(), oat_patches.data() + oat_patches.size(), delta, 158 actual.data(), actual.data() + actual.size()); 159 160 EXPECT_EQ(expected, actual); 161 } 162 } 163 164 } // namespace art 165
