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- // Copyright (c) 2011 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "courgette/disassembler_elf_32_x86.h"
- #include <ctype.h>
- #include <stddef.h>
- #include <stdint.h>
- #include <algorithm>
- #include <memory>
- #include <set>
- #include <string>
- #include <vector>
- #include "base/memory/ptr_util.h"
- #include "courgette/assembly_program.h"
- #include "courgette/base_test_unittest.h"
- #include "courgette/image_utils.h"
- namespace courgette {
- namespace {
- class TestDisassemblerElf32X86 : public DisassemblerElf32X86 {
- public:
- TestDisassemblerElf32X86(const uint8_t* start, size_t length)
- : DisassemblerElf32X86(start, length) {}
- ~TestDisassemblerElf32X86() override = default;
- void TestSectionHeaderFileOffsetOrder() {
- std::vector<FileOffset> file_offsets;
- for (Elf32_Half section_id : section_header_file_offset_order_) {
- const Elf32_Shdr* section_header = SectionHeader(section_id);
- file_offsets.push_back(section_header->sh_offset);
- }
- EXPECT_EQ(static_cast<size_t>(SectionHeaderCount()), file_offsets.size());
- EXPECT_TRUE(std::is_sorted(file_offsets.begin(), file_offsets.end()));
- }
- void TestSectionName() {
- std::set<std::string> name_set;
- for (const Elf32_Shdr& section_header : section_header_table_) {
- std::string name;
- EXPECT_TRUE(SectionName(section_header, &name));
- // Ensure |name| is unique and is printable (may be empty though).
- EXPECT_EQ(0U, name_set.count(name));
- EXPECT_TRUE(std::all_of(name.begin(), name.end(), ::isprint));
- name_set.insert(name);
- }
- // Check for existence of a few common sections.
- EXPECT_EQ(1U, name_set.count(".text"));
- EXPECT_EQ(1U, name_set.count(".data"));
- EXPECT_EQ(1U, name_set.count(".rodata"));
- EXPECT_EQ(1U, name_set.count(".bss"));
- EXPECT_EQ(1U, name_set.count(".shstrtab"));
- }
- };
- class DisassemblerElf32X86Test : public BaseTest {
- public:
- void TestExe(const char* file_name,
- size_t expected_abs_count,
- size_t expected_rel_count) const;
- };
- void DisassemblerElf32X86Test::TestExe(const char* file_name,
- size_t expected_abs_count,
- size_t expected_rel_count) const {
- std::string file1 = FileContents(file_name);
- auto disassembler = std::make_unique<TestDisassemblerElf32X86>(
- reinterpret_cast<const uint8_t*>(file1.c_str()), file1.length());
- bool can_parse_header = disassembler->ParseHeader();
- EXPECT_TRUE(can_parse_header);
- EXPECT_TRUE(disassembler->ok());
- EXPECT_EQ(EXE_ELF_32_X86, disassembler->kind());
- EXPECT_EQ(0U, disassembler->image_base());
- // The length of the disassembled value will be slightly smaller than the
- // real file, since trailing debug info is not included
- EXPECT_EQ(file1.length(), disassembler->length());
- const uint8_t* offset_p = disassembler->FileOffsetToPointer(0);
- EXPECT_EQ(reinterpret_cast<const void*>(file1.c_str()),
- reinterpret_cast<const void*>(offset_p));
- EXPECT_EQ(0x7F, offset_p[0]);
- EXPECT_EQ('E', offset_p[1]);
- EXPECT_EQ('L', offset_p[2]);
- EXPECT_EQ('F', offset_p[3]);
- std::unique_ptr<AssemblyProgram> program = disassembler->CreateProgram(false);
- EXPECT_TRUE(nullptr != program.get());
- const std::vector<RVA>& abs32_list = disassembler->Abs32Locations();
- // Flatten the list typed rel32 to a list of rel32 RVAs.
- std::vector<RVA> rel32_list;
- rel32_list.reserve(disassembler->Rel32Locations().size());
- for (auto& typed_rel32 : disassembler->Rel32Locations())
- rel32_list.push_back(typed_rel32->rva());
- EXPECT_EQ(expected_abs_count, abs32_list.size());
- EXPECT_EQ(expected_rel_count, rel32_list.size());
- EXPECT_TRUE(std::is_sorted(abs32_list.begin(), abs32_list.end()));
- EXPECT_TRUE(std::is_sorted(rel32_list.begin(), rel32_list.end()));
- // Verify that rel32 RVAs do not overlap with abs32 RVAs.
- // TODO(huangs): Fix this to account for RVA's 4-byte width.
- bool found_match = false;
- std::vector<RVA>::const_iterator abs32_it = abs32_list.begin();
- std::vector<RVA>::const_iterator rel32_it = rel32_list.begin();
- while (abs32_it != abs32_list.end() && rel32_it != rel32_list.end()) {
- if (*abs32_it < *rel32_it) {
- ++abs32_it;
- } else if (*abs32_it > *rel32_it) {
- ++rel32_it;
- } else {
- found_match = true;
- }
- }
- EXPECT_FALSE(found_match);
- disassembler->TestSectionHeaderFileOffsetOrder();
- disassembler->TestSectionName();
- }
- } // namespace
- TEST_F(DisassemblerElf32X86Test, All) {
- TestExe("elf-32-1", 200, 3337);
- TestExe("elf-32-high-bss", 0, 4);
- }
- } // namespace courgette
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