void symbol_entries(const ELFObjectFile<T> &obj, ogre_doc &s) {
typedef typename ELFFile<T>::Elf_Shdr sec_hdr;
auto elf = obj.getELFFile();
symbol_entries(obj, obj.symbol_begin(), obj.symbol_end(), s);
auto secs = prim::elf_sections(*elf);
bool is_dyn = std::any_of(secs.begin(), secs.end(),
[](const sec_hdr &hdr) { return (hdr.sh_type == ELF::SHT_DYNSYM); });
if (is_dyn) // preventing from llvm 3.8 fail in case of .dynsym absence
symbol_entries(obj, obj.dynamic_symbol_begin(), obj.dynamic_symbol_end(), s);
}
bool checked(const ELFObjectFile<T> &obj, SectionRef sec_ref) {
typedef typename ELFObjectFile<T>::Elf_Shdr Elf_Shdr;
auto &elf = *obj.getELFFile();
const Elf_Shdr *RelSec = obj.getSection(sec_ref.getRawDataRefImpl());
auto symsec = elf.getSection(RelSec->sh_link);
if (!symsec) return false;
uint32_t sec_typ = (*symsec)->sh_type;
return
(sec_typ == ELF::SHT_SYMTAB || sec_typ == ELF::SHT_DYNSYM);
}
uint64_t section_offset(const ELFObjectFile<T> &obj, section_iterator it) {
typedef typename ELFObjectFile<T>::Elf_Shdr_Iter elf_shdr_iterator;
if (it == obj.end_sections()) return 0; // check for special elf sections
auto elf = obj.getELFFile();
auto raw = it->getRawDataRefImpl();
auto elf_sec_it = elf_shdr_iterator(elf->getHeader()->e_shentsize,
reinterpret_cast<const char *>(raw.p));
return elf_sec_it->sh_offset;
}
std::vector<segment> read(const ELFObjectFile<T>& obj) {
auto begin = obj.getELFFile()->begin_program_headers();
auto end = obj.getELFFile()->end_program_headers();
std::vector<segment> segments;
segments.reserve(std::distance(begin, end));
for (int pos = 0; begin != end; ++begin, ++pos) {
if (begin -> p_type == ELF::PT_LOAD) {
segments.push_back(segment(*begin, pos));
}
}
return segments;
}
static bool isObject(ELFObjectFile<ELFT> &Obj, symbol_iterator I) {
typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
DataRefImpl Symb = I->getRawDataRefImpl();
const Elf_Sym *ESym = Obj.getSymbol(Symb);
return ESym->getType() == ELF::STT_OBJECT;
}
void relocations(const ELFObjectFile<T> &obj, ogre_doc &s) {
for (auto sec : obj.sections()) {
auto rel_sec = sec.getRelocatedSection();
if (!checked(obj, sec)) continue;
for (auto rel : sec.relocations())
symbol_reference(obj, rel, rel_sec, s);
}
}
static char getSymbolNMTypeChar(ELFObjectFile<ELFT> &Obj,
basic_symbol_iterator I) {
typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
typedef typename ELFObjectFile<ELFT>::Elf_Shdr Elf_Shdr;
// OK, this is ELF
symbol_iterator SymI(I);
DataRefImpl Symb = I->getRawDataRefImpl();
const Elf_Sym *ESym = Obj.getSymbol(Symb);
const ELFFile<ELFT> &EF = *Obj.getELFFile();
const Elf_Shdr *ESec = EF.getSection(ESym);
if (ESec) {
switch (ESec->sh_type) {
case ELF::SHT_PROGBITS:
case ELF::SHT_DYNAMIC:
switch (ESec->sh_flags) {
case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR):
return 't';
case (ELF::SHF_TLS | ELF::SHF_ALLOC | ELF::SHF_WRITE):
case (ELF::SHF_ALLOC | ELF::SHF_WRITE):
return 'd';
case ELF::SHF_ALLOC:
case (ELF::SHF_ALLOC | ELF::SHF_MERGE):
case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS):
return 'r';
}
break;
case ELF::SHT_NOBITS:
return 'b';
}
}
if (ESym->getType() == ELF::STT_SECTION) {
StringRef Name;
if (error(SymI->getName(Name)))
return '?';
return StringSwitch<char>(Name)
.StartsWith(".debug", 'N')
.StartsWith(".note", 'n')
.Default('?');
}
return '?';
}
void section_headers(const ELFObjectFile<T> &obj, ogre_doc &s) {
auto elf = obj.getELFFile();
auto base = base_address(obj);
for (auto sec : prim::elf_sections(*elf)) {
auto name = prim::elf_section_name(*elf, &sec);
if (name)
section_header(sec, *name, base, s);
}
}
void section_headers(const ELFObjectFile<T> &obj, ogre_doc &s) {
auto elf = obj.getELFFile();
auto base = base_address(obj);
for (auto it = elf->begin_sections(); it != elf->end_sections(); ++it) {
auto name = elf->getSectionName(&*it);
if (name)
section_header(*it, (*name).str(), base, s);
else
s.fail(error_code(name).message());
}
}
error_or<int64_t> symbol_address(const ELFObjectFile<T> &obj, const SymbolRef &sym) {
auto sym_elf = obj.getSymbol(sym.getRawDataRefImpl());
if (is_rel(obj) && !is_abs_symbol(*sym_elf)) { // abs symbols does not affected by relocations
return success(int64_t(0));
} else {
auto addr = prim::symbol_address(sym);
if (!addr) return addr;
auto base = base_address(obj);
return success(prim::relative_address(base, *addr));
}
}
error_or<symbol_sizes> getSymbolSizes(const ELFObjectFile<ELFT> &obj) {
typedef typename ELFFile<ELFT>::Elf_Shdr sec_hdr;
symbol_sizes syms;
for (auto sym : obj.symbols())
syms.push_back({sym, sym.getSize()});
auto sections = prim::elf_sections(*obj.getELFFile());
bool is_dyn = std::any_of(sections.begin(), sections.end(),
[](const sec_hdr &hdr) { return (hdr.sh_type == ELF::SHT_DYNSYM); });
if (!syms.size() && !is_dyn)
return success(symbol_sizes());
if (is_dyn) // we aren't able to rely on iterators because of bug in llvm
for (auto sym : obj.getDynamicSymbolIterators())
syms.push_back({sym, sym.getSize()});
return success(syms);
}
void symbol_entry(const ELFObjectFile<T> &obj, const SymbolRef &sym, ogre_doc &s) {
auto sym_elf = obj.getSymbol(sym.getRawDataRefImpl());
if (is_abs_symbol(*sym_elf)) {
return;
}
auto name = prim::symbol_name(sym);
auto addr = symbol_address(obj, sym);
auto off = symbol_file_offset(obj, sym);
if (name && addr && off) {
s.entry("symbol-entry") << *name << *addr << sym_elf->st_size << *off;
if (sym_elf->getType() == ELF::STT_FUNC)
s.entry("code-entry") << *name << *off << sym_elf->st_size ;
}
}
void symbol_reference(const ELFObjectFile<T> &obj, const RelocationRef &rel, section_iterator sec, ogre_doc &s) {
auto it = rel.getSymbol();
if (it == prim::end_symbols(obj)) return;
auto sym_elf = obj.getSymbol(it->getRawDataRefImpl());
auto sec_offset = section_offset(obj, sec);
auto off = prim::relocation_offset(rel) + sec_offset; // relocation file offset
if (is_external_symbol(*sym_elf)) {
if (auto name = prim::symbol_name(*it))
s.entry("ref-external") << off << *name;
} else {
if (auto file_offset = symbol_file_offset(obj, *it))
s.entry("ref-internal") << *file_offset << off;
}
}
std::vector<symbol> read(const ELFObjectFile<ELFT>& obj) {
int size1 = utils::distance(obj.begin_symbols(),
obj.end_symbols());
int size2 = utils::distance(obj.begin_dynamic_symbols(),
obj.end_dynamic_symbols());
std::vector<symbol> symbols;
symbols.reserve(size1+size2);
auto it = read(obj.begin_symbols(),
obj.end_symbols(),
std::back_inserter(symbols));
read(obj.begin_dynamic_symbols(),
obj.end_dynamic_symbols(),
it);
return symbols;
}
void program_headers(const ELFObjectFile<T> &obj, ogre_doc &s) {
auto elf = obj.getELFFile();
program_headers(elf->begin_program_headers(), elf->end_program_headers(), s);
}
uint64_t base_address(const ELFObjectFile<T> &obj) {
auto elf = obj.getELFFile();
return base_address(elf->begin_program_headers(), elf->end_program_headers());
}
uint64_t section_offset(const ELFObjectFile<T> &obj, section_iterator it) {
if (it == obj.section_end()) return 0; // check for special elf sections
auto sec_elf = obj.getSection(it->getRawDataRefImpl());
return sec_elf->sh_offset;
}
void program_headers(const ELFObjectFile<T> &obj, ogre_doc &s) {
auto hdrs = prim::elf_program_headers(*obj.getELFFile());
program_headers(hdrs.begin(), hdrs.end(), s);
}
uint64_t base_address(const ELFObjectFile<T> &obj) {
auto hdrs = prim::elf_program_headers(*obj.getELFFile());
return base_address(hdrs.begin(), hdrs.end());
}
void symbol_entries(const ELFObjectFile<T> &obj, ogre_doc &s) {
typedef typename ELFFile<T>::Elf_Shdr sec_hdr;
auto elf = obj.getELFFile();
symbol_entries(obj, obj.begin_symbols(), obj.end_symbols(), s);
symbol_entries(obj, obj.begin_dynamic_symbols(), obj.end_dynamic_symbols(), s);
}
bool is_rel(const ELFObjectFile<T> &obj) {
auto hdr = obj.getELFFile()->getHeader();
return (hdr->e_type == ELF::ET_REL);
}
uint64_t image_entry(const ELFObjectFile<ELFT>& obj) {
return obj.getELFFile()->getHeader()->e_entry;
}
error_code getSymbolNMTypeChar(ELFObjectFile<ELFT> &Obj, symbol_iterator I,
char &Result) {
typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
typedef typename ELFObjectFile<ELFT>::Elf_Shdr Elf_Shdr;
DataRefImpl Symb = I->getRawDataRefImpl();
const Elf_Sym *ESym = Obj.getSymbol(Symb);
const ELFFile<ELFT> &EF = *Obj.getELFFile();
const Elf_Shdr *ESec = EF.getSection(ESym);
char ret = '?';
if (ESec) {
switch (ESec->sh_type) {
case ELF::SHT_PROGBITS:
case ELF::SHT_DYNAMIC:
switch (ESec->sh_flags) {
case(ELF::SHF_ALLOC | ELF::SHF_EXECINSTR) :
ret = 't';
break;
case(ELF::SHF_ALLOC | ELF::SHF_WRITE) :
ret = 'd';
break;
case ELF::SHF_ALLOC:
case(ELF::SHF_ALLOC | ELF::SHF_MERGE) :
case(ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS) :
ret = 'r';
break;
}
break;
case ELF::SHT_NOBITS:
ret = 'b';
}
}
switch (EF.getSymbolTableIndex(ESym)) {
case ELF::SHN_UNDEF:
if (ret == '?')
ret = 'U';
break;
case ELF::SHN_ABS:
ret = 'a';
break;
case ELF::SHN_COMMON:
ret = 'c';
break;
}
switch (ESym->getBinding()) {
case ELF::STB_GLOBAL:
ret = ::toupper(ret);
break;
case ELF::STB_WEAK:
if (EF.getSymbolTableIndex(ESym) == ELF::SHN_UNDEF)
ret = 'w';
else if (ESym->getType() == ELF::STT_OBJECT)
ret = 'V';
else
ret = 'W';
}
if (ret == '?' && ESym->getType() == ELF::STT_SECTION) {
StringRef Name;
error_code EC = I->getName(Name);
if (EC)
return EC;
Result = StringSwitch<char>(Name)
.StartsWith(".debug", 'N')
.StartsWith(".note", 'n')
.Default('?');
return object_error::success;
}
Result = ret;
return object_error::success;
}
void file_header(const ELFObjectFile<T> &obj, ogre_doc &s) {
auto hdr = obj.getELFFile()->getHeader();
auto base = base_address(obj);
s.entry("relocatable") << is_rel(obj);
s.entry("entry") << hdr->e_entry - base;
}
