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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.
#ifndef COURGETTE_DISASSEMBLER_WIN32_X86_H_
#define COURGETTE_DISASSEMBLER_WIN32_X86_H_
#include <stddef.h>
#include <stdint.h>
#include <map>
#include <string>
#include <vector>
#include "base/macros.h"
#include "courgette/disassembler.h"
#include "courgette/image_utils.h"
#include "courgette/memory_allocator.h"
#include "courgette/types_win_pe.h"
namespace courgette {
class AssemblyProgram;
class DisassemblerWin32X86 : public Disassembler {
public:
explicit DisassemblerWin32X86(const void* start, size_t length);
// Disassembler interfaces.
RVA FileOffsetToRVA(FileOffset file_offset) const override;
FileOffset RVAToFileOffset(RVA rva) const override;
RVA PointerToTargetRVA(const uint8_t* p) const override;
ExecutableType kind() const override { return EXE_WIN_32_X86; }
bool ParseHeader() override;
bool Disassemble(AssemblyProgram* target) override;
// Exposed for test purposes
bool has_text_section() const { return has_text_section_; }
uint32_t size_of_code() const { return size_of_code_; }
bool is_32bit() const { return !is_PE32_plus_; }
// Returns 'true' if the base relocation table can be parsed.
// Output is a vector of the RVAs corresponding to locations within executable
// that are listed in the base relocation table.
bool ParseRelocs(std::vector<RVA> *addresses);
// Returns Section containing the relative virtual address, or null if none.
const Section* RVAToSection(RVA rva) const;
// (4) -> (5) (see AddressTranslator comment): Returns the RVA of the VA
// specified by |address|, or kNoRVA if |address| lies outside of the image.
RVA Address32ToRVA(uint32_t address) const;
static std::string SectionName(const Section* section);
protected:
// Disassembler interfaces.
RvaVisitor* CreateAbs32TargetRvaVisitor() override;
RvaVisitor* CreateRel32TargetRvaVisitor() override;
void RemoveUnusedRel32Locations(AssemblyProgram* program) override;
CheckBool ParseFile(AssemblyProgram* target) WARN_UNUSED_RESULT;
bool ParseAbs32Relocs();
void ParseRel32RelocsFromSections();
void ParseRel32RelocsFromSection(const Section* section);
CheckBool ParseNonSectionFileRegion(FileOffset start_file_offset,
FileOffset end_file_offset,
AssemblyProgram* program)
WARN_UNUSED_RESULT;
CheckBool ParseFileRegion(const Section* section,
FileOffset start_file_offset,
FileOffset end_file_offset,
AssemblyProgram* program) WARN_UNUSED_RESULT;
#if COURGETTE_HISTOGRAM_TARGETS
void HistogramTargets(const char* kind, const std::map<RVA, int>& map);
#endif
// Most addresses are represented as 32-bit RVAs. The one address we can't
// do this with is the image base address.
uint32_t image_base() const { return static_cast<uint32_t>(image_base_); }
const ImageDataDirectory& base_relocation_table() const {
return base_relocation_table_;
}
// Returns description of the RVA, e.g. ".text+0x1243". For debugging only.
std::string DescribeRVA(RVA rva) const;
// Finds the first section at file_offset or above. Does not return sections
// that have no raw bytes in the file.
const Section* FindNextSection(FileOffset file_offset) const;
private:
bool ReadDataDirectory(int index, ImageDataDirectory* dir);
bool incomplete_disassembly_; // true if can omit "uninteresting" bits.
std::vector<RVA> abs32_locations_;
std::vector<RVA> rel32_locations_;
//
// Information that is valid after ParseHeader() succeeds.
//
bool is_PE32_plus_; // PE32_plus is for 64 bit executables.
// Location and size of IMAGE_OPTIONAL_HEADER in the buffer.
const uint8_t* optional_header_;
uint16_t size_of_optional_header_;
uint16_t offset_of_data_directories_;
uint16_t machine_type_;
uint16_t number_of_sections_;
const Section *sections_;
bool has_text_section_;
uint32_t size_of_code_;
uint32_t size_of_initialized_data_;
uint32_t size_of_uninitialized_data_;
RVA base_of_code_;
RVA base_of_data_;
uint64_t image_base_; // range limited to 32 bits for 32 bit executable
uint32_t size_of_image_;
int number_of_data_directories_;
ImageDataDirectory export_table_;
ImageDataDirectory import_table_;
ImageDataDirectory resource_table_;
ImageDataDirectory exception_table_;
ImageDataDirectory base_relocation_table_;
ImageDataDirectory bound_import_table_;
ImageDataDirectory import_address_table_;
ImageDataDirectory delay_import_descriptor_;
ImageDataDirectory clr_runtime_header_;
#if COURGETTE_HISTOGRAM_TARGETS
std::map<RVA, int> abs32_target_rvas_;
std::map<RVA, int> rel32_target_rvas_;
#endif
DISALLOW_COPY_AND_ASSIGN(DisassemblerWin32X86);
};
} // namespace courgette
#endif // COURGETTE_DISASSEMBLER_WIN32_X86_H_