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      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/stringprintf.h"
     20 #include "common_compiler_test.h"
     21 #include "oat.h"
     22 #include "utils.h"
     23 
     24 namespace art {
     25 
     26 class ElfWriterTest : public CommonCompilerTest {
     27  protected:
     28   virtual void SetUp() {
     29     ReserveImageSpace();
     30     CommonCompilerTest::SetUp();
     31   }
     32 };
     33 
     34 #define EXPECT_ELF_FILE_ADDRESS(ef, expected_value, symbol_name, build_map) \
     35   do { \
     36     void* addr = reinterpret_cast<void*>(ef->FindSymbolAddress(SHT_DYNSYM, \
     37                                                                symbol_name, \
     38                                                                build_map)); \
     39     EXPECT_NE(nullptr, addr); \
     40     EXPECT_LT(static_cast<uintptr_t>(ART_BASE_ADDRESS), reinterpret_cast<uintptr_t>(addr)); \
     41     if (expected_value == nullptr) { \
     42       expected_value = addr; \
     43     }                        \
     44     EXPECT_EQ(expected_value, addr); \
     45     EXPECT_EQ(expected_value, ef->FindDynamicSymbolAddress(symbol_name)); \
     46   } while (false)
     47 
     48 TEST_F(ElfWriterTest, dlsym) {
     49   std::string elf_location;
     50   if (IsHost()) {
     51     const char* host_dir = getenv("ANDROID_HOST_OUT");
     52     CHECK(host_dir != NULL);
     53     elf_location = StringPrintf("%s/framework/core.oat", host_dir);
     54   } else {
     55     elf_location = "/data/art-test/core.oat";
     56   }
     57   std::string elf_filename = GetSystemImageFilename(elf_location.c_str(), kRuntimeISA);
     58   LOG(INFO) << "elf_filename=" << elf_filename;
     59 
     60   UnreserveImageSpace();
     61   void* dl_oatdata = NULL;
     62   void* dl_oatexec = NULL;
     63   void* dl_oatlastword = NULL;
     64 
     65 #if defined(ART_USE_PORTABLE_COMPILER)
     66   {
     67     // We only use dlopen for loading with portable. See OatFile::Open.
     68     void* dl_oat_so = dlopen(elf_filename.c_str(), RTLD_NOW);
     69     ASSERT_TRUE(dl_oat_so != NULL) << dlerror();
     70     dl_oatdata = dlsym(dl_oat_so, "oatdata");
     71     ASSERT_TRUE(dl_oatdata != NULL);
     72 
     73     OatHeader* dl_oat_header = reinterpret_cast<OatHeader*>(dl_oatdata);
     74     ASSERT_TRUE(dl_oat_header->IsValid());
     75     dl_oatexec = dlsym(dl_oat_so, "oatexec");
     76     ASSERT_TRUE(dl_oatexec != NULL);
     77     ASSERT_LT(dl_oatdata, dl_oatexec);
     78 
     79     dl_oatlastword = dlsym(dl_oat_so, "oatlastword");
     80     ASSERT_TRUE(dl_oatlastword != NULL);
     81     ASSERT_LT(dl_oatexec, dl_oatlastword);
     82 
     83     ASSERT_EQ(0, dlclose(dl_oat_so));
     84   }
     85 #endif
     86 
     87   std::unique_ptr<File> file(OS::OpenFileForReading(elf_filename.c_str()));
     88   ASSERT_TRUE(file.get() != NULL);
     89   {
     90     std::string error_msg;
     91     std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), false, false, &error_msg));
     92     CHECK(ef.get() != nullptr) << error_msg;
     93     EXPECT_ELF_FILE_ADDRESS(ef, dl_oatdata, "oatdata", false);
     94     EXPECT_ELF_FILE_ADDRESS(ef, dl_oatexec, "oatexec", false);
     95     EXPECT_ELF_FILE_ADDRESS(ef, dl_oatlastword, "oatlastword", false);
     96   }
     97   {
     98     std::string error_msg;
     99     std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), false, false, &error_msg));
    100     CHECK(ef.get() != nullptr) << error_msg;
    101     EXPECT_ELF_FILE_ADDRESS(ef, dl_oatdata, "oatdata", true);
    102     EXPECT_ELF_FILE_ADDRESS(ef, dl_oatexec, "oatexec", true);
    103     EXPECT_ELF_FILE_ADDRESS(ef, dl_oatlastword, "oatlastword", true);
    104   }
    105   {
    106     std::string error_msg;
    107     std::unique_ptr<ElfFile> ef(ElfFile::Open(file.get(), false, true, &error_msg));
    108     CHECK(ef.get() != nullptr) << error_msg;
    109     CHECK(ef->Load(false, &error_msg)) << error_msg;
    110     EXPECT_EQ(dl_oatdata, ef->FindDynamicSymbolAddress("oatdata"));
    111     EXPECT_EQ(dl_oatexec, ef->FindDynamicSymbolAddress("oatexec"));
    112     EXPECT_EQ(dl_oatlastword, ef->FindDynamicSymbolAddress("oatlastword"));
    113   }
    114 }
    115 
    116 }  // namespace art
    117