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 <sys/mman.h> // For the PROT_NONE constant.
18
19 #include "base/file_utils.h"
20 #include "base/mem_map.h"
21 #include "base/unix_file/fd_file.h"
22 #include "base/utils.h"
23 #include "common_compiler_driver_test.h"
24 #include "elf/elf_builder.h"
25 #include "elf_writer_quick.h"
26 #include "oat/elf_file.h"
27 #include "oat/elf_file_impl.h"
28 #include "oat/oat.h"
29
30 namespace art {
31 namespace linker {
32
33 class ElfWriterTest : public CommonCompilerDriverTest {
34 protected:
SetUp()35 void SetUp() override {
36 ReserveImageSpace();
37 CommonCompilerTest::SetUp();
38 }
39 };
40
41 #define EXPECT_ELF_FILE_ADDRESS(ef, expected_value, symbol_name, build_map) \
42 do { \
43 void* addr = reinterpret_cast<void*>((ef)->FindSymbolAddress(SHT_DYNSYM, \
44 symbol_name, \
45 build_map)); \
46 EXPECT_NE(nullptr, addr); \
47 if ((expected_value) == nullptr) { \
48 (expected_value) = addr; \
49 } \
50 EXPECT_EQ(expected_value, addr); \
51 EXPECT_EQ(expected_value, (ef)->FindDynamicSymbolAddress(symbol_name)); \
52 } while (false)
53
TEST_F(ElfWriterTest,dlsym)54 TEST_F(ElfWriterTest, dlsym) {
55 std::string elf_location = GetCoreOatLocation();
56 std::string elf_filename = GetSystemImageFilename(elf_location.c_str(), kRuntimeISA);
57 LOG(INFO) << "elf_filename=" << elf_filename;
58
59 UnreserveImageSpace();
60 void* dl_oatdata = nullptr;
61 void* dl_oatexec = nullptr;
62 void* dl_oatlastword = nullptr;
63
64 std::unique_ptr<File> file(OS::OpenFileForReading(elf_filename.c_str()));
65 ASSERT_TRUE(file.get() != nullptr) << elf_filename;
66 {
67 std::string error_msg;
68 std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(),
69 /*writable=*/ false,
70 /*program_header_only=*/ false,
71 /*low_4gb=*/false,
72 &error_msg));
73 CHECK(ef.get() != nullptr) << error_msg;
74 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatdata, "oatdata", false);
75 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatexec, "oatexec", false);
76 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatlastword, "oatlastword", false);
77 }
78 {
79 std::string error_msg;
80 std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(),
81 /*writable=*/ false,
82 /*program_header_only=*/ false,
83 /*low_4gb=*/ false,
84 &error_msg));
85 CHECK(ef.get() != nullptr) << error_msg;
86 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatdata, "oatdata", true);
87 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatexec, "oatexec", true);
88 EXPECT_ELF_FILE_ADDRESS(ef, dl_oatlastword, "oatlastword", true);
89 }
90 {
91 std::string error_msg;
92 std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(),
93 /*writable=*/ false,
94 /*program_header_only=*/ true,
95 /*low_4gb=*/ false,
96 &error_msg));
97 CHECK(ef.get() != nullptr) << error_msg;
98 size_t size;
99 bool success = ef->GetLoadedSize(&size, &error_msg);
100 CHECK(success) << error_msg;
101 MemMap reservation = MemMap::MapAnonymous("ElfWriterTest#dlsym reservation",
102 RoundUp(size, MemMap::GetPageSize()),
103 PROT_NONE,
104 /*low_4gb=*/ true,
105 &error_msg);
106 CHECK(reservation.IsValid()) << error_msg;
107 uint8_t* base = reservation.Begin();
108 success =
109 ef->Load(file.get(), /*executable=*/ false, /*low_4gb=*/ false, &reservation, &error_msg);
110 CHECK(success) << error_msg;
111 CHECK(!reservation.IsValid());
112 EXPECT_EQ(reinterpret_cast<uintptr_t>(dl_oatdata) + reinterpret_cast<uintptr_t>(base),
113 reinterpret_cast<uintptr_t>(ef->FindDynamicSymbolAddress("oatdata")));
114 EXPECT_EQ(reinterpret_cast<uintptr_t>(dl_oatexec) + reinterpret_cast<uintptr_t>(base),
115 reinterpret_cast<uintptr_t>(ef->FindDynamicSymbolAddress("oatexec")));
116 EXPECT_EQ(reinterpret_cast<uintptr_t>(dl_oatlastword) + reinterpret_cast<uintptr_t>(base),
117 reinterpret_cast<uintptr_t>(ef->FindDynamicSymbolAddress("oatlastword")));
118 }
119 }
120
TEST_F(ElfWriterTest,CheckBuildIdPresent)121 TEST_F(ElfWriterTest, CheckBuildIdPresent) {
122 std::string elf_location = GetCoreOatLocation();
123 std::string elf_filename = GetSystemImageFilename(elf_location.c_str(), kRuntimeISA);
124 LOG(INFO) << "elf_filename=" << elf_filename;
125
126 std::unique_ptr<File> file(OS::OpenFileForReading(elf_filename.c_str()));
127 ASSERT_TRUE(file.get() != nullptr);
128 {
129 std::string error_msg;
130 std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(),
131 /*writable=*/ false,
132 /*program_header_only=*/ false,
133 /*low_4gb=*/ false,
134 &error_msg));
135 CHECK(ef.get() != nullptr) << error_msg;
136 EXPECT_TRUE(ef->HasSection(".note.gnu.build-id"));
137 }
138 }
139
140 } // namespace linker
141 } // namespace art
142