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
13namespace courgette {
14
15class AssemblyProgram;
16
17class 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_
64