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      1 /*
      2  * Copyright 2011, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ELF_SECTION_HEADER_H
     18 #define ELF_SECTION_HEADER_H
     19 
     20 #include "ELFTypes.h"
     21 
     22 #include <stdint.h>
     23 
     24 class ELFSectionHeaderHelperMixin {
     25 protected:
     26   static char const *getSectionTypeStr(uint32_t type);
     27 };
     28 
     29 template <unsigned Bitwidth>
     30 class ELFSectionHeader_CRTP : private ELFSectionHeaderHelperMixin {
     31 public:
     32   ELF_TYPE_INTRO_TO_TEMPLATE_SCOPE(Bitwidth);
     33 
     34 protected:
     35   ELFObjectTy const *owner;
     36 
     37   size_t index;
     38 
     39   word_t sh_name;
     40   word_t sh_type;
     41   addr_t sh_addr;
     42   offset_t sh_offset;
     43   word_t sh_link;
     44   word_t sh_info;
     45 
     46 protected:
     47   ELFSectionHeader_CRTP() { }
     48   ~ELFSectionHeader_CRTP() { }
     49 
     50 public:
     51   size_t getIndex() const {
     52     return index;
     53   }
     54 
     55   word_t getNameIndex() const {
     56     return sh_name;
     57   }
     58 
     59   char const *getName() const;
     60 
     61   word_t getType() const {
     62     return sh_type;
     63   }
     64 
     65   addr_t getAddress() const {
     66     return sh_addr;
     67   }
     68 
     69   offset_t getOffset() const {
     70     return sh_offset;
     71   }
     72 
     73   word_t getLink() const {
     74     return sh_link;
     75   }
     76 
     77   word_t getExtraInfo() const {
     78     return sh_info;
     79   }
     80 
     81   bool isValid() const {
     82     // FIXME: Should check the correctness of the section header.
     83     return true;
     84   }
     85 
     86   template <typename Archiver>
     87   static ELFSectionHeaderTy *
     88   read(Archiver &AR, ELFObjectTy const *owner, size_t index = 0);
     89 
     90   void print(bool shouldPrintHeader = false) const;
     91 
     92 private:
     93   ELFSectionHeaderTy *concrete() {
     94     return static_cast<ELFSectionHeaderTy *>(this);
     95   }
     96 
     97   ELFSectionHeaderTy const *concrete() const {
     98     return static_cast<ELFSectionHeaderTy const *>(this);
     99   }
    100 };
    101 
    102 
    103 #include "impl/ELFSectionHeader.hxx"
    104 
    105 template <>
    106 class ELFSectionHeader<32> : public ELFSectionHeader_CRTP<32> {
    107   friend class ELFSectionHeader_CRTP<32>;
    108 
    109 private:
    110   word_t sh_flags;
    111   word_t sh_size;
    112   word_t sh_addralign;
    113   word_t sh_entsize;
    114 
    115 private:
    116   ELFSectionHeader() {
    117   }
    118 
    119   template <typename Archiver>
    120   bool serialize(Archiver &AR) {
    121     AR.prologue(TypeTraits<ELFSectionHeader>::size);
    122 
    123     AR & sh_name;
    124     AR & sh_type;
    125     AR & sh_flags;
    126     AR & sh_addr;
    127     AR & sh_offset;
    128     AR & sh_size;
    129     AR & sh_link;
    130     AR & sh_info;
    131     AR & sh_addralign;
    132     AR & sh_entsize;
    133 
    134     AR.epilogue(TypeTraits<ELFSectionHeader>::size);
    135     return AR;
    136   }
    137 
    138 public:
    139   word_t getFlags() const {
    140     return sh_flags;
    141   }
    142 
    143   word_t getSize() const {
    144     return sh_size;
    145   }
    146 
    147   word_t getAddressAlign() const {
    148     return sh_addralign;
    149   }
    150 
    151   word_t getEntrySize() const {
    152     return sh_entsize;
    153   }
    154 };
    155 
    156 template <>
    157 class ELFSectionHeader<64> : public ELFSectionHeader_CRTP<64> {
    158   friend class ELFSectionHeader_CRTP<64>;
    159 
    160 private:
    161   xword_t sh_flags;
    162   xword_t sh_size;
    163   xword_t sh_addralign;
    164   xword_t sh_entsize;
    165 
    166 private:
    167   ELFSectionHeader() {
    168   }
    169 
    170   template <typename Archiver>
    171   bool serialize(Archiver &AR) {
    172     AR.prologue(TypeTraits<ELFSectionHeader>::size);
    173 
    174     AR & sh_name;
    175     AR & sh_type;
    176     AR & sh_flags;
    177     AR & sh_addr;
    178     AR & sh_offset;
    179     AR & sh_size;
    180     AR & sh_link;
    181     AR & sh_info;
    182     AR & sh_addralign;
    183     AR & sh_entsize;
    184 
    185     AR.epilogue(TypeTraits<ELFSectionHeader>::size);
    186     return AR;
    187   }
    188 
    189 public:
    190   xword_t getFlags() const {
    191     return sh_flags;
    192   }
    193 
    194   xword_t getSize() const {
    195     return sh_size;
    196   }
    197 
    198   xword_t getAddressAlign() const {
    199     return sh_addralign;
    200   }
    201 
    202   xword_t getEntrySize() const {
    203     return sh_entsize;
    204   }
    205 };
    206 
    207 #endif // ELF_SECTION_HEADER_H
    208