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      1 // Copyright (c) 2012, Google Inc.
      2 // All rights reserved.
      3 //
      4 // Redistribution and use in source and binary forms, with or without
      5 // modification, are permitted provided that the following conditions are
      6 // met:
      7 //
      8 //     * Redistributions of source code must retain the above copyright
      9 // notice, this list of conditions and the following disclaimer.
     10 //     * Redistributions in binary form must reproduce the above
     11 // copyright notice, this list of conditions and the following disclaimer
     12 // in the documentation and/or other materials provided with the
     13 // distribution.
     14 //     * Neither the name of Google Inc. nor the names of its
     15 // contributors may be used to endorse or promote products derived from
     16 // this software without specific prior written permission.
     17 //
     18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29 
     30 #ifndef COMMON_LINUX_ELFUTILS_INL_H__
     31 #define COMMON_LINUX_ELFUTILS_INL_H__
     32 
     33 #include "common/linux/linux_libc_support.h"
     34 #include "elfutils.h"
     35 
     36 namespace google_breakpad {
     37 
     38 template<typename ElfClass, typename T>
     39 const T* GetOffset(const typename ElfClass::Ehdr* elf_header,
     40                    typename ElfClass::Off offset) {
     41   return reinterpret_cast<const T*>(reinterpret_cast<uintptr_t>(elf_header) +
     42                                     offset);
     43 }
     44 
     45 template<typename ElfClass>
     46 const typename ElfClass::Shdr* FindElfSectionByName(
     47     const char* name,
     48     typename ElfClass::Word section_type,
     49     const typename ElfClass::Shdr* sections,
     50     const char* section_names,
     51     const char* names_end,
     52     int nsection) {
     53   assert(name != NULL);
     54   assert(sections != NULL);
     55   assert(nsection > 0);
     56 
     57   int name_len = my_strlen(name);
     58   if (name_len == 0)
     59     return NULL;
     60 
     61   for (int i = 0; i < nsection; ++i) {
     62     const char* section_name = section_names + sections[i].sh_name;
     63     if (sections[i].sh_type == section_type &&
     64         names_end - section_name >= name_len + 1 &&
     65         my_strcmp(name, section_name) == 0) {
     66       return sections + i;
     67     }
     68   }
     69   return NULL;
     70 }
     71 
     72 }  // namespace google_breakpad
     73 
     74 #endif  // COMMON_LINUX_ELFUTILS_INL_H__
     75