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R=mark at https://breakpad.appspot.com/392002/ git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@986 4c0a9323-5329-0410-9bdc-e9ce6186880e
122 lines
4.3 KiB
C++
122 lines
4.3 KiB
C++
// Copyright (c) 2012, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "common/linux/elfutils.h"
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#include <assert.h>
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#include <string.h>
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#include "common/linux/linux_libc_support.h"
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namespace google_breakpad {
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namespace {
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template<typename ElfClass>
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void FindElfClassSection(const char *elf_base,
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const char *section_name,
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uint32_t section_type,
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const void **section_start,
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int *section_size) {
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typedef typename ElfClass::Ehdr Ehdr;
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typedef typename ElfClass::Shdr Shdr;
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assert(elf_base);
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assert(section_start);
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assert(section_size);
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assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);
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int name_len = my_strlen(section_name);
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const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);
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assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);
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const Shdr* sections =
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reinterpret_cast<const Shdr*>(elf_base + elf_header->e_shoff);
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const Shdr* string_section = sections + elf_header->e_shstrndx;
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const Shdr* section = NULL;
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for (int i = 0; i < elf_header->e_shnum; ++i) {
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if (sections[i].sh_type == section_type) {
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const char* current_section_name = (char*)(elf_base +
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string_section->sh_offset +
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sections[i].sh_name);
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if (!my_strncmp(current_section_name, section_name, name_len)) {
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section = §ions[i];
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break;
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}
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}
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}
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if (section != NULL && section->sh_size > 0) {
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*section_start = elf_base + section->sh_offset;
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*section_size = section->sh_size;
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}
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}
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} // namespace
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bool FindElfSection(const void *elf_mapped_base,
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const char *section_name,
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uint32_t section_type,
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const void **section_start,
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int *section_size,
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int *elfclass) {
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assert(elf_mapped_base);
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assert(section_start);
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assert(section_size);
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*section_start = NULL;
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*section_size = 0;
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const char* elf_base =
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static_cast<const char*>(elf_mapped_base);
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const ElfW(Ehdr)* elf_header =
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reinterpret_cast<const ElfW(Ehdr)*>(elf_base);
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if (my_strncmp(elf_base, ELFMAG, SELFMAG) != 0)
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return false;
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if (elfclass) {
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*elfclass = elf_header->e_ident[EI_CLASS];
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}
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if (elf_header->e_ident[EI_CLASS] == ELFCLASS32) {
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FindElfClassSection<ElfClass32>(elf_base, section_name, section_type,
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section_start, section_size);
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return *section_start != NULL;
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} else if (elf_header->e_ident[EI_CLASS] == ELFCLASS64) {
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FindElfClassSection<ElfClass64>(elf_base, section_name, section_type,
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section_start, section_size);
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return *section_start != NULL;
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}
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return false;
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}
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} // namespace google_breakpad
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