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      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_
     83