courgette/disassembler_elf_32_arm.h

   1 // Copyright 2013 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_ARM_H_
   6 #define COURGETTE_DISASSEMBLER_ELF_32_ARM_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 enum ARM_RVA {
  18   ARM_OFF8,
  19   ARM_OFF11,
  20   ARM_OFF24,
  21   ARM_OFF25,
  22   ARM_OFF21,
  23 };
  24
  25 class DisassemblerElf32ARM : public DisassemblerElf32 {
  26  public:
  27   class TypedRVAARM : public TypedRVA {
  28    public:
  29     TypedRVAARM(ARM_RVA type, RVA rva) : TypedRVA(rva), type_(type) { }
  30
  31     uint16 c_op() const {
  32       return c_op_;
  33     }
  34
  35     virtual CheckBool ComputeRelativeTarget(const uint8* op_pointer);
  36
  37     virtual CheckBool EmitInstruction(AssemblyProgram* program,
  38                                       RVA target_rva);
  39
  40     virtual uint16 op_size() const;
  41
  42    private:
  43     ARM_RVA type_;
  44
  45     uint16 c_op_;  // set by ComputeRelativeTarget()
  46     const uint8* arm_op_;
  47   };
  48
  49   explicit DisassemblerElf32ARM(const void* start, size_t length);
  50
  51   virtual ExecutableType kind() { return EXE_ELF_32_ARM; }
  52
  53   virtual e_machine_values ElfEM() { return EM_ARM; }
  54
  55   static CheckBool Compress(ARM_RVA type, uint32 arm_op, RVA rva,
  56                             uint16* c_op /* out */, uint32* addr /* out */);
  57
  58   static CheckBool Decompress(ARM_RVA type, uint16 c_op, uint32 addr,
  59                               uint32* arm_op /* out */);
  60
  61  protected:
  62
  63   virtual CheckBool RelToRVA(Elf32_Rel rel, RVA* result)
  64     const WARN_UNUSED_RESULT;
  65
  66   virtual CheckBool ParseRelocationSection(
  67       const Elf32_Shdr *section_header,
  68         AssemblyProgram* program) WARN_UNUSED_RESULT;
  69
  70   virtual CheckBool ParseRel32RelocsFromSection(
  71       const Elf32_Shdr* section) WARN_UNUSED_RESULT;
  72
  73 #if COURGETTE_HISTOGRAM_TARGETS
  74   std::map<RVA, int> rel32_target_rvas_;
  75 #endif
  76
  77   DISALLOW_COPY_AND_ASSIGN(DisassemblerElf32ARM);
  78 };
  79
  80 }  // namespace courgette
  81
  82 #endif  // COURGETTE_DISASSEMBLER_ELF_32_ARM_H_