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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 "base/basictypes.h"
#include "courgette/disassembler.h"
#include "courgette/memory_allocator.h"
#include "courgette/types_win_pe.h"
#ifdef COURGETTE_HISTOGRAM_TARGETS
#include <map>
#endif
namespace courgette {
class AssemblyProgram;
class DisassemblerWin32X86 : public Disassembler {
public:
explicit DisassemblerWin32X86(const void* start, size_t length);
virtual ExecutableType kind() { return EXE_WIN_32_X86; }
// Returns 'true' if the buffer appears to point to a Windows 32 bit
// executable, 'false' otherwise. If ParseHeader() succeeds, other member
// functions may be called.
virtual bool ParseHeader();
virtual bool Disassemble(AssemblyProgram* target);
//
// Exposed for test purposes
//
bool has_text_section() const { return has_text_section_; }
uint32 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;
static const int kNoOffset = -1;
// Returns kNoOffset if there is no file offset corresponding to 'rva'.
int RVAToFileOffset(RVA rva) const;
// Returns same as FileOffsetToPointer(RVAToFileOffset(rva)) except that NULL
// is returned if there is no file offset corresponding to 'rva'.
const uint8* RVAToPointer(RVA rva) const;
static std::string SectionName(const Section* section);
protected:
CheckBool ParseFile(AssemblyProgram* target) WARN_UNUSED_RESULT;
bool ParseAbs32Relocs();
void ParseRel32RelocsFromSections();
void ParseRel32RelocsFromSection(const Section* section);
CheckBool ParseNonSectionFileRegion(uint32 start_file_offset,
uint32 end_file_offset, AssemblyProgram* program) WARN_UNUSED_RESULT;
CheckBool ParseFileRegion(const Section* section,
uint32 start_file_offset, uint32 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. 'image_base' is valid only for
// 32-bit executables. 'image_base_64' is valid for 32- and 64-bit executable.
uint32 image_base() const { return static_cast<uint32>(image_base_); }
const ImageDataDirectory& base_relocation_table() const {
return base_relocation_table_;
}
bool IsValidRVA(RVA rva) const { return rva < size_of_image_; }
// 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(uint32 file_offset) const;
// There are 2 'coordinate systems' for reasoning about executables.
// FileOffset - the the offset within a single .EXE or .DLL *file*.
// RVA - relative virtual address (offset within *loaded image*)
// FileOffsetToRVA and RVAToFileOffset convert between these representations.
RVA FileOffsetToRVA(uint32 offset) const;
private:
bool ReadDataDirectory(int index, ImageDataDirectory* dir);
bool incomplete_disassembly_; // 'true' if can leave out 'uninteresting' bits
std::vector<RVA> abs32_locations_;
std::vector<RVA> rel32_locations_;
//
// Fields that are always valid.
//
//
// Information that is valid after successful ParseHeader.
//
bool is_PE32_plus_; // PE32_plus is for 64 bit executables.
// Location and size of IMAGE_OPTIONAL_HEADER in the buffer.
const uint8 *optional_header_;
uint16 size_of_optional_header_;
uint16 offset_of_data_directories_;
uint16 machine_type_;
uint16 number_of_sections_;
const Section *sections_;
bool has_text_section_;
uint32 size_of_code_;
uint32 size_of_initialized_data_;
uint32 size_of_uninitialized_data_;
RVA base_of_code_;
RVA base_of_data_;
uint64 image_base_; // range limited to 32 bits for 32 bit executable
uint32 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_
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