//------------------------------------------------------------------------------
bool
get_entry( Elf_Xword index,
Elf64_Addr& offset,
Elf_Word& symbol,
Elf_Word& type,
Elf_Sxword& addend ) const
{
if ( index >= get_entries_num() ) { // Is index valid
return false;
}
if ( elf_file.get_class() == ELFCLASS32 ) {
if ( SHT_REL == relocation_section->get_type() ) {
generic_get_entry_rel< Elf32_Rel >( index, offset, symbol,
type, addend );
}
else if ( SHT_RELA == relocation_section->get_type() ) {
generic_get_entry_rela< Elf32_Rela >( index, offset, symbol,
type, addend );
}
}
else {
if ( SHT_REL == relocation_section->get_type() ) {
generic_get_entry_rel< Elf64_Rel >( index, offset, symbol,
type, addend );
}
else if ( SHT_RELA == relocation_section->get_type() ) {
generic_get_entry_rela< Elf64_Rela >( index, offset, symbol,
type, addend );
}
}
return true;
}
//------------------------------------------------------------------------------
bool
get_entry( Elf_Xword index,
Elf_Xword& tag,
Elf_Xword& value,
std::string& str ) const
{
if ( index >= get_entries_num() ) { // Is index valid
return false;
}
if ( elf_file.get_class() == ELFCLASS32 ) {
generic_get_entry_dyn< Elf32_Dyn >( index, tag, value );
}
else {
generic_get_entry_dyn< Elf64_Dyn >( index, tag, value );
}
// If the tag may have a string table reference, prepare the string
if ( tag == DT_NEEDED ||
tag == DT_SONAME ||
tag == DT_RPATH ||
tag == DT_RUNPATH ) {
string_section_accessor strsec =
elf_file.sections[ get_string_table_index() ];
const char* result = strsec.get_string( value );
if ( 0 == result ) {
str.clear();
return false;
}
str = result;
}
else {
str.clear();
}
return true;
}
void DotOFileParser::load_relocations() {
// Relocations
for (auto &psec : reader->sections) {
if ((reader->get_class() == ELFCLASS32 && psec->get_type() == SHT_REL) ||
(reader->get_class() == ELFCLASS64 && psec->get_type() == SHT_RELA)) {
try {
Section &targetSection = _sections.at((Elf_Half) psec->get_info());
// We need to ignore relocations on !allocated sections,
// since they don't have memory addresses
if (!targetSection.allocated)
continue;
vector<Relocation> &relo_vec = targetSection.relo_vec;
const auto relocations = relocation_section_accessor(*reader, psec);
auto relo_num = relocations.get_entries_num();
for (unsigned int i = 0; i < relo_num; ++i) {
Elf64_Addr offset;
Elf_Word symbol;
Elf64_Addr symbolValue;
std::string symbolName;
Elf_Word type;
Elf_Sxword addend;
Elf_Sxword calcValue;
relocations.get_entry(i, offset, symbolValue, symbolName, type, addend, calcValue);
if (strncmp(symbolName.c_str(), "_TRaP_Linux", sizeof("_TRaP_Linux")-1) == 0) continue;
bool elf32 = reader->get_class() == ELFCLASS32;
bool elf64 = reader->get_class() == ELFCLASS64;
if (std::find(std::begin(RelocWhitelist), std::end(RelocWhitelist), type) !=
std::end(RelocWhitelist)) {
relo_vec.push_back(Relocation(offset, type, addend));
#if OFPreadprint >= 2
printf("%4d: 0x%08llx 0x%08x %+lld %i\n", i, offset, symbol, addend, type);
#endif
} else {
cerr << "Unknown type " << type << " (file '" << filename << "', "
<< "section: " << psec->get_name() << ", "
<< "offset: " << hex << offset << dec << ", "
<< "relo index: " << i << "/" << relo_num << ")" << endl;
exit(13);
}
}
} catch (std::out_of_range e) {} // for .sr.text
}
}
#ifdef OFPprintres
for (auto &it : _sections) {
if (!it.second.executable)
continue;
printf("sec %d: %s\n", it.first, it.second.name.c_str());
auto &sym_vec = it.second.sym_vec;
printf(" symbols:\n");
sort(sym_vec.begin(), sym_vec.end());
for (auto &jt : sym_vec) {
printf(" %08lx %08ld\n", jt.start, jt.size);
}
auto &relo_vec = it.second.relo_vec;
printf(" relocations:\n");
sort(relo_vec.begin(), relo_vec.end());
for (auto &jt : relo_vec) {
printf(" %08lx %d\n", jt.offset, jt.type);
}
}
#endif
}
