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/*
* Copyright (C) 2011 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 "elf_file.h"
#include "base/stringprintf.h"
#include "base/unix_file/fd_file.h"
#include "common_compiler_test.h"
#include "elf_file.h"
#include "elf_file_impl.h"
#include "elf_writer_quick.h"
#include "oat.h"
#include "utils.h"
namespace art {
class ElfWriterTest : public CommonCompilerTest {
protected:
virtual void SetUp() {
ReserveImageSpace();
CommonCompilerTest::SetUp();
}
};
#define EXPECT_ELF_FILE_ADDRESS(ef, expected_value, symbol_name, build_map) \
do { \
void* addr = reinterpret_cast<void*>(ef->FindSymbolAddress(SHT_DYNSYM, \
symbol_name, \
build_map)); \
EXPECT_NE(nullptr, addr); \
EXPECT_LT(static_cast<uintptr_t>(ART_BASE_ADDRESS), reinterpret_cast<uintptr_t>(addr)); \
if (expected_value == nullptr) { \
expected_value = addr; \
} \
EXPECT_EQ(expected_value, addr); \
EXPECT_EQ(expected_value, ef->FindDynamicSymbolAddress(symbol_name)); \
} while (false)
TEST_F(ElfWriterTest, dlsym) {
std::string elf_location = GetCoreOatLocation();
std::string elf_filename = GetSystemImageFilename(elf_location.c_str(), kRuntimeISA);
LOG(INFO) << "elf_filename=" << elf_filename;
UnreserveImageSpace();
void* dl_oatdata = NULL;
void* dl_oatexec = NULL;
void* dl_oatlastword = NULL;
std::unique_ptr<File> file(OS::OpenFileForReading(elf_filename.c_str()));
ASSERT_TRUE(file.get() != NULL);
{
std::string error_msg;
std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), false, false, &error_msg));
CHECK(ef.get() != nullptr) << error_msg;
EXPECT_ELF_FILE_ADDRESS(ef, dl_oatdata, "oatdata", false);
EXPECT_ELF_FILE_ADDRESS(ef, dl_oatexec, "oatexec", false);
EXPECT_ELF_FILE_ADDRESS(ef, dl_oatlastword, "oatlastword", false);
}
{
std::string error_msg;
std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), false, false, &error_msg));
CHECK(ef.get() != nullptr) << error_msg;
EXPECT_ELF_FILE_ADDRESS(ef, dl_oatdata, "oatdata", true);
EXPECT_ELF_FILE_ADDRESS(ef, dl_oatexec, "oatexec", true);
EXPECT_ELF_FILE_ADDRESS(ef, dl_oatlastword, "oatlastword", true);
}
{
std::string error_msg;
std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), false, true, &error_msg));
CHECK(ef.get() != nullptr) << error_msg;
CHECK(ef->Load(false, &error_msg)) << error_msg;
EXPECT_EQ(dl_oatdata, ef->FindDynamicSymbolAddress("oatdata"));
EXPECT_EQ(dl_oatexec, ef->FindDynamicSymbolAddress("oatexec"));
EXPECT_EQ(dl_oatlastword, ef->FindDynamicSymbolAddress("oatlastword"));
}
}
// Run only on host since we do unaligned memory accesses.
#ifndef HAVE_ANDROID_OS
static void PatchSection(const std::vector<uintptr_t>& patch_locations,
std::vector<uint8_t>* section, int32_t delta) {
for (uintptr_t location : patch_locations) {
*reinterpret_cast<int32_t*>(section->data() + location) += delta;
}
}
TEST_F(ElfWriterTest, EncodeDecodeOatPatches) {
std::vector<uint8_t> oat_patches; // Encoded patches.
// Encode patch locations for a few sections.
OatWriter::PatchLocationsMap sections;
std::vector<uintptr_t> patches0 { 0, 4, 8, 15, 128, 200 }; // NOLINT
sections.emplace(".section0", std::unique_ptr<std::vector<uintptr_t>>(
new std::vector<uintptr_t> { patches0 }));
std::vector<uintptr_t> patches1 { 8, 127 }; // NOLINT
sections.emplace(".section1", std::unique_ptr<std::vector<uintptr_t>>(
new std::vector<uintptr_t> { patches1 }));
std::vector<uintptr_t> patches2 { }; // NOLINT
sections.emplace(".section2", std::unique_ptr<std::vector<uintptr_t>>(
new std::vector<uintptr_t> { patches2 }));
ElfWriterQuick32::EncodeOatPatches(sections, &oat_patches);
// Create buffers to be patched.
std::vector<uint8_t> initial_data(256);
for (size_t i = 0; i < initial_data.size(); i++) {
initial_data[i] = i;
}
std::vector<uint8_t> section0_expected = initial_data;
std::vector<uint8_t> section1_expected = initial_data;
std::vector<uint8_t> section2_expected = initial_data;
std::vector<uint8_t> section0_actual = initial_data;
std::vector<uint8_t> section1_actual = initial_data;
std::vector<uint8_t> section2_actual = initial_data;
// Patch manually.
constexpr int32_t delta = 0x11235813;
PatchSection(patches0, §ion0_expected, delta);
PatchSection(patches1, §ion1_expected, delta);
PatchSection(patches2, §ion2_expected, delta);
// Decode and apply patch locations.
bool section0_successful = ElfFileImpl32::ApplyOatPatches(
oat_patches.data(), oat_patches.data() + oat_patches.size(),
".section0", delta,
section0_actual.data(), section0_actual.data() + section0_actual.size());
EXPECT_TRUE(section0_successful);
EXPECT_EQ(section0_expected, section0_actual);
bool section1_successful = ElfFileImpl32::ApplyOatPatches(
oat_patches.data(), oat_patches.data() + oat_patches.size(),
".section1", delta,
section1_actual.data(), section1_actual.data() + section1_actual.size());
EXPECT_TRUE(section1_successful);
EXPECT_EQ(section1_expected, section1_actual);
bool section2_successful = ElfFileImpl32::ApplyOatPatches(
oat_patches.data(), oat_patches.data() + oat_patches.size(),
".section2", delta,
section2_actual.data(), section2_actual.data() + section2_actual.size());
EXPECT_TRUE(section2_successful);
EXPECT_EQ(section2_expected, section2_actual);
}
#endif
} // namespace art
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