courgette/disassembler_elf_32_x86.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COURGETTE_DISASSEMBLER_ELF_32_X86_H_
   6 #define COURGETTE_DISASSEMBLER_ELF_32_X86_H_
   7
   8 #include "base/basictypes.h"
   9 #include "courgette/disassembler_elf_32.h"
  10 #include "courgette/memory_allocator.h"
  11 #include "courgette/types_elf.h"
  12
  13 namespace courgette {
  14
  15 class AssemblyProgram;
  16
  17 class DisassemblerElf32X86 : public DisassemblerElf32 {
  18  public:
  19   class TypedRVAX86 : public TypedRVA {
  20    public:
  21     explicit TypedRVAX86(RVA rva) : TypedRVA(rva) {
  22     }
  23
  24     virtual CheckBool ComputeRelativeTarget(const uint8* op_pointer) override {
  25       set_relative_target(Read32LittleEndian(op_pointer) + 4);
  26       return true;
  27     }
  28
  29     virtual CheckBool EmitInstruction(AssemblyProgram* program,
  30                                        RVA target_rva) override {
  31       return program->EmitRel32(program->FindOrMakeRel32Label(target_rva));
  32     }
  33
  34     virtual uint16 op_size() const override { return 4; }
  35   };
  36
  37   explicit DisassemblerElf32X86(const void* start, size_t length);
  38
  39   virtual ExecutableType kind() { return EXE_ELF_32_X86; }
  40
  41   virtual e_machine_values ElfEM() { return EM_386; }
  42
  43  protected:
  44   virtual CheckBool RelToRVA(Elf32_Rel rel, RVA* result)
  45       const WARN_UNUSED_RESULT;
  46
  47   virtual CheckBool ParseRelocationSection(
  48       const Elf32_Shdr *section_header,
  49       AssemblyProgram* program) WARN_UNUSED_RESULT;
  50
  51   virtual CheckBool ParseRel32RelocsFromSection(
  52       const Elf32_Shdr* section) WARN_UNUSED_RESULT;
  53
  54 #if COURGETTE_HISTOGRAM_TARGETS
  55   std::map<RVA, int> rel32_target_rvas_;
  56 #endif
  57
  58   DISALLOW_COPY_AND_ASSIGN(DisassemblerElf32X86);
  59 };
  60
  61 }  // namespace courgette
  62
  63 #endif  // COURGETTE_DISASSEMBLER_ELF_32_X86_H_