| // object.cc -- support for an object file for linking in gold |
| |
| // Copyright 2006, 2007 Free Software Foundation, Inc. |
| // Written by Ian Lance Taylor <iant@google.com>. |
| |
| // This file is part of gold. |
| |
| // This program is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License as published by |
| // the Free Software Foundation; either version 3 of the License, or |
| // (at your option) any later version. |
| |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| // MA 02110-1301, USA. |
| |
| #include "gold.h" |
| |
| #include <cerrno> |
| #include <cstring> |
| #include <cstdarg> |
| #include "demangle.h" |
| #include "libiberty.h" |
| |
| #include "target-select.h" |
| #include "dwarf_reader.h" |
| #include "layout.h" |
| #include "output.h" |
| #include "symtab.h" |
| #include "reloc.h" |
| #include "object.h" |
| #include "dynobj.h" |
| |
| namespace gold |
| { |
| |
| // Class Object. |
| |
| // Set the target based on fields in the ELF file header. |
| |
| void |
| Object::set_target(int machine, int size, bool big_endian, int osabi, |
| int abiversion) |
| { |
| Target* target = select_target(machine, size, big_endian, osabi, abiversion); |
| if (target == NULL) |
| gold_fatal(_("%s: unsupported ELF machine number %d"), |
| this->name().c_str(), machine); |
| this->target_ = target; |
| } |
| |
| // Report an error for this object file. This is used by the |
| // elfcpp::Elf_file interface, and also called by the Object code |
| // itself. |
| |
| void |
| Object::error(const char* format, ...) const |
| { |
| va_list args; |
| va_start(args, format); |
| char* buf = NULL; |
| if (vasprintf(&buf, format, args) < 0) |
| gold_nomem(); |
| va_end(args); |
| gold_error(_("%s: %s"), this->name().c_str(), buf); |
| free(buf); |
| } |
| |
| // Return a view of the contents of a section. |
| |
| const unsigned char* |
| Object::section_contents(unsigned int shndx, section_size_type* plen, |
| bool cache) |
| { |
| Location loc(this->do_section_contents(shndx)); |
| *plen = convert_to_section_size_type(loc.data_size); |
| return this->get_view(loc.file_offset, *plen, cache); |
| } |
| |
| // Read the section data into SD. This is code common to Sized_relobj |
| // and Sized_dynobj, so we put it into Object. |
| |
| template<int size, bool big_endian> |
| void |
| Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, |
| Read_symbols_data* sd) |
| { |
| const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| |
| // Read the section headers. |
| const off_t shoff = elf_file->shoff(); |
| const unsigned int shnum = this->shnum(); |
| sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, true); |
| |
| // Read the section names. |
| const unsigned char* pshdrs = sd->section_headers->data(); |
| const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; |
| typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); |
| |
| if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) |
| this->error(_("section name section has wrong type: %u"), |
| static_cast<unsigned int>(shdrnames.get_sh_type())); |
| |
| sd->section_names_size = |
| convert_to_section_size_type(shdrnames.get_sh_size()); |
| sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), |
| sd->section_names_size, false); |
| } |
| |
| // If NAME is the name of a special .gnu.warning section, arrange for |
| // the warning to be issued. SHNDX is the section index. Return |
| // whether it is a warning section. |
| |
| bool |
| Object::handle_gnu_warning_section(const char* name, unsigned int shndx, |
| Symbol_table* symtab) |
| { |
| const char warn_prefix[] = ".gnu.warning."; |
| const int warn_prefix_len = sizeof warn_prefix - 1; |
| if (strncmp(name, warn_prefix, warn_prefix_len) == 0) |
| { |
| // Read the section contents to get the warning text. It would |
| // be nicer if we only did this if we have to actually issue a |
| // warning. Unfortunately, warnings are issued as we relocate |
| // sections. That means that we can not lock the object then, |
| // as we might try to issue the same warning multiple times |
| // simultaneously. |
| section_size_type len; |
| const unsigned char* contents = this->section_contents(shndx, &len, |
| false); |
| std::string warning(reinterpret_cast<const char*>(contents), len); |
| symtab->add_warning(name + warn_prefix_len, this, warning); |
| return true; |
| } |
| return false; |
| } |
| |
| // Class Sized_relobj. |
| |
| template<int size, bool big_endian> |
| Sized_relobj<size, big_endian>::Sized_relobj( |
| const std::string& name, |
| Input_file* input_file, |
| off_t offset, |
| const elfcpp::Ehdr<size, big_endian>& ehdr) |
| : Relobj(name, input_file, offset), |
| elf_file_(this, ehdr), |
| symtab_shndx_(-1U), |
| local_symbol_count_(0), |
| output_local_symbol_count_(0), |
| output_local_dynsym_count_(0), |
| symbols_(), |
| local_symbol_offset_(0), |
| local_dynsym_offset_(0), |
| local_values_(), |
| local_got_offsets_(), |
| has_eh_frame_(false) |
| { |
| } |
| |
| template<int size, bool big_endian> |
| Sized_relobj<size, big_endian>::~Sized_relobj() |
| { |
| } |
| |
| // Set up an object file based on the file header. This sets up the |
| // target and reads the section information. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::setup( |
| const elfcpp::Ehdr<size, big_endian>& ehdr) |
| { |
| this->set_target(ehdr.get_e_machine(), size, big_endian, |
| ehdr.get_e_ident()[elfcpp::EI_OSABI], |
| ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); |
| |
| const unsigned int shnum = this->elf_file_.shnum(); |
| this->set_shnum(shnum); |
| } |
| |
| // Find the SHT_SYMTAB section, given the section headers. The ELF |
| // standard says that maybe in the future there can be more than one |
| // SHT_SYMTAB section. Until somebody figures out how that could |
| // work, we assume there is only one. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::find_symtab(const unsigned char* pshdrs) |
| { |
| const unsigned int shnum = this->shnum(); |
| this->symtab_shndx_ = 0; |
| if (shnum > 0) |
| { |
| // Look through the sections in reverse order, since gas tends |
| // to put the symbol table at the end. |
| const unsigned char* p = pshdrs + shnum * This::shdr_size; |
| unsigned int i = shnum; |
| while (i > 0) |
| { |
| --i; |
| p -= This::shdr_size; |
| typename This::Shdr shdr(p); |
| if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) |
| { |
| this->symtab_shndx_ = i; |
| break; |
| } |
| } |
| } |
| } |
| |
| // Return whether SHDR has the right type and flags to be a GNU |
| // .eh_frame section. |
| |
| template<int size, bool big_endian> |
| bool |
| Sized_relobj<size, big_endian>::check_eh_frame_flags( |
| const elfcpp::Shdr<size, big_endian>* shdr) const |
| { |
| return (shdr->get_sh_size() > 0 |
| && shdr->get_sh_type() == elfcpp::SHT_PROGBITS |
| && shdr->get_sh_flags() == elfcpp::SHF_ALLOC); |
| } |
| |
| // Return whether there is a GNU .eh_frame section, given the section |
| // headers and the section names. |
| |
| template<int size, bool big_endian> |
| bool |
| Sized_relobj<size, big_endian>::find_eh_frame( |
| const unsigned char* pshdrs, |
| const char* names, |
| section_size_type names_size) const |
| { |
| const unsigned int shnum = this->shnum(); |
| const unsigned char* p = pshdrs + This::shdr_size; |
| for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) |
| { |
| typename This::Shdr shdr(p); |
| if (this->check_eh_frame_flags(&shdr)) |
| { |
| if (shdr.get_sh_name() >= names_size) |
| { |
| this->error(_("bad section name offset for section %u: %lu"), |
| i, static_cast<unsigned long>(shdr.get_sh_name())); |
| continue; |
| } |
| |
| const char* name = names + shdr.get_sh_name(); |
| if (strcmp(name, ".eh_frame") == 0) |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| // Read the sections and symbols from an object file. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
| { |
| this->read_section_data(&this->elf_file_, sd); |
| |
| const unsigned char* const pshdrs = sd->section_headers->data(); |
| |
| this->find_symtab(pshdrs); |
| |
| const unsigned char* namesu = sd->section_names->data(); |
| const char* names = reinterpret_cast<const char*>(namesu); |
| if (this->find_eh_frame(pshdrs, names, sd->section_names_size)) |
| this->has_eh_frame_ = true; |
| |
| sd->symbols = NULL; |
| sd->symbols_size = 0; |
| sd->external_symbols_offset = 0; |
| sd->symbol_names = NULL; |
| sd->symbol_names_size = 0; |
| |
| if (this->symtab_shndx_ == 0) |
| { |
| // No symbol table. Weird but legal. |
| return; |
| } |
| |
| // Get the symbol table section header. |
| typename This::Shdr symtabshdr(pshdrs |
| + this->symtab_shndx_ * This::shdr_size); |
| gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| |
| // If this object has a .eh_frame section, we need all the symbols. |
| // Otherwise we only need the external symbols. While it would be |
| // simpler to just always read all the symbols, I've seen object |
| // files with well over 2000 local symbols, which for a 64-bit |
| // object file format is over 5 pages that we don't need to read |
| // now. |
| |
| const int sym_size = This::sym_size; |
| const unsigned int loccount = symtabshdr.get_sh_info(); |
| this->local_symbol_count_ = loccount; |
| this->local_values_.resize(loccount); |
| section_offset_type locsize = loccount * sym_size; |
| off_t dataoff = symtabshdr.get_sh_offset(); |
| section_size_type datasize = |
| convert_to_section_size_type(symtabshdr.get_sh_size()); |
| off_t extoff = dataoff + locsize; |
| section_size_type extsize = datasize - locsize; |
| |
| off_t readoff = this->has_eh_frame_ ? dataoff : extoff; |
| section_size_type readsize = this->has_eh_frame_ ? datasize : extsize; |
| |
| File_view* fvsymtab = this->get_lasting_view(readoff, readsize, false); |
| |
| // Read the section header for the symbol names. |
| unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
| if (strtab_shndx >= this->shnum()) |
| { |
| this->error(_("invalid symbol table name index: %u"), strtab_shndx); |
| return; |
| } |
| typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
| if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
| { |
| this->error(_("symbol table name section has wrong type: %u"), |
| static_cast<unsigned int>(strtabshdr.get_sh_type())); |
| return; |
| } |
| |
| // Read the symbol names. |
| File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), |
| strtabshdr.get_sh_size(), true); |
| |
| sd->symbols = fvsymtab; |
| sd->symbols_size = readsize; |
| sd->external_symbols_offset = this->has_eh_frame_ ? locsize : 0; |
| sd->symbol_names = fvstrtab; |
| sd->symbol_names_size = |
| convert_to_section_size_type(strtabshdr.get_sh_size()); |
| } |
| |
| // Return the section index of symbol SYM. Set *VALUE to its value in |
| // the object file. Note that for a symbol which is not defined in |
| // this object file, this will set *VALUE to 0 and return SHN_UNDEF; |
| // it will not return the final value of the symbol in the link. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Sized_relobj<size, big_endian>::symbol_section_and_value(unsigned int sym, |
| Address* value) |
| { |
| section_size_type symbols_size; |
| const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
| &symbols_size, |
| false); |
| |
| const size_t count = symbols_size / This::sym_size; |
| gold_assert(sym < count); |
| |
| elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size); |
| *value = elfsym.get_st_value(); |
| // FIXME: Handle SHN_XINDEX. |
| return elfsym.get_st_shndx(); |
| } |
| |
| // Return whether to include a section group in the link. LAYOUT is |
| // used to keep track of which section groups we have already seen. |
| // INDEX is the index of the section group and SHDR is the section |
| // header. If we do not want to include this group, we set bits in |
| // OMIT for each section which should be discarded. |
| |
| template<int size, bool big_endian> |
| bool |
| Sized_relobj<size, big_endian>::include_section_group( |
| Layout* layout, |
| unsigned int index, |
| const elfcpp::Shdr<size, big_endian>& shdr, |
| std::vector<bool>* omit) |
| { |
| // Read the section contents. |
| const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), |
| shdr.get_sh_size(), false); |
| const elfcpp::Elf_Word* pword = |
| reinterpret_cast<const elfcpp::Elf_Word*>(pcon); |
| |
| // The first word contains flags. We only care about COMDAT section |
| // groups. Other section groups are always included in the link |
| // just like ordinary sections. |
| elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
| if ((flags & elfcpp::GRP_COMDAT) == 0) |
| return true; |
| |
| // Look up the group signature, which is the name of a symbol. This |
| // is a lot of effort to go to to read a string. Why didn't they |
| // just use the name of the SHT_GROUP section as the group |
| // signature? |
| |
| // Get the appropriate symbol table header (this will normally be |
| // the single SHT_SYMTAB section, but in principle it need not be). |
| const unsigned int link = shdr.get_sh_link(); |
| typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); |
| |
| // Read the symbol table entry. |
| if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size) |
| { |
| this->error(_("section group %u info %u out of range"), |
| index, shdr.get_sh_info()); |
| return false; |
| } |
| off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size; |
| const unsigned char* psym = this->get_view(symoff, This::sym_size, false); |
| elfcpp::Sym<size, big_endian> sym(psym); |
| |
| // Read the symbol table names. |
| section_size_type symnamelen; |
| const unsigned char* psymnamesu; |
| psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen, |
| true); |
| const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
| |
| // Get the section group signature. |
| if (sym.get_st_name() >= symnamelen) |
| { |
| this->error(_("symbol %u name offset %u out of range"), |
| shdr.get_sh_info(), sym.get_st_name()); |
| return false; |
| } |
| |
| const char* signature = psymnames + sym.get_st_name(); |
| |
| // It seems that some versions of gas will create a section group |
| // associated with a section symbol, and then fail to give a name to |
| // the section symbol. In such a case, use the name of the section. |
| // FIXME. |
| std::string secname; |
| if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) |
| { |
| secname = this->section_name(sym.get_st_shndx()); |
| signature = secname.c_str(); |
| } |
| |
| // Record this section group, and see whether we've already seen one |
| // with the same signature. |
| if (layout->add_comdat(signature, true)) |
| return true; |
| |
| // This is a duplicate. We want to discard the sections in this |
| // group. |
| size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); |
| for (size_t i = 1; i < count; ++i) |
| { |
| elfcpp::Elf_Word secnum = |
| elfcpp::Swap<32, big_endian>::readval(pword + i); |
| if (secnum >= this->shnum()) |
| { |
| this->error(_("section %u in section group %u out of range"), |
| secnum, index); |
| continue; |
| } |
| (*omit)[secnum] = true; |
| } |
| |
| return false; |
| } |
| |
| // Whether to include a linkonce section in the link. NAME is the |
| // name of the section and SHDR is the section header. |
| |
| // Linkonce sections are a GNU extension implemented in the original |
| // GNU linker before section groups were defined. The semantics are |
| // that we only include one linkonce section with a given name. The |
| // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, |
| // where T is the type of section and SYMNAME is the name of a symbol. |
| // In an attempt to make linkonce sections interact well with section |
| // groups, we try to identify SYMNAME and use it like a section group |
| // signature. We want to block section groups with that signature, |
| // but not other linkonce sections with that signature. We also use |
| // the full name of the linkonce section as a normal section group |
| // signature. |
| |
| template<int size, bool big_endian> |
| bool |
| Sized_relobj<size, big_endian>::include_linkonce_section( |
| Layout* layout, |
| const char* name, |
| const elfcpp::Shdr<size, big_endian>&) |
| { |
| // In general the symbol name we want will be the string following |
| // the last '.'. However, we have to handle the case of |
| // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by |
| // some versions of gcc. So we use a heuristic: if the name starts |
| // with ".gnu.linkonce.t.", we use everything after that. Otherwise |
| // we look for the last '.'. We can't always simply skip |
| // ".gnu.linkonce.X", because we have to deal with cases like |
| // ".gnu.linkonce.d.rel.ro.local". |
| const char* const linkonce_t = ".gnu.linkonce.t."; |
| const char* symname; |
| if (strncmp(name, linkonce_t, strlen(linkonce_t)) == 0) |
| symname = name + strlen(linkonce_t); |
| else |
| symname = strrchr(name, '.') + 1; |
| bool include1 = layout->add_comdat(symname, false); |
| bool include2 = layout->add_comdat(name, true); |
| return include1 && include2; |
| } |
| |
| // Lay out the input sections. We walk through the sections and check |
| // whether they should be included in the link. If they should, we |
| // pass them to the Layout object, which will return an output section |
| // and an offset. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::do_layout(Symbol_table* symtab, |
| Layout* layout, |
| Read_symbols_data* sd) |
| { |
| const unsigned int shnum = this->shnum(); |
| if (shnum == 0) |
| return; |
| |
| // Get the section headers. |
| const unsigned char* pshdrs = sd->section_headers->data(); |
| |
| // Get the section names. |
| const unsigned char* pnamesu = sd->section_names->data(); |
| const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| |
| // For each section, record the index of the reloc section if any. |
| // Use 0 to mean that there is no reloc section, -1U to mean that |
| // there is more than one. |
| std::vector<unsigned int> reloc_shndx(shnum, 0); |
| std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL); |
| // Skip the first, dummy, section. |
| pshdrs += This::shdr_size; |
| for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
| { |
| typename This::Shdr shdr(pshdrs); |
| |
| unsigned int sh_type = shdr.get_sh_type(); |
| if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA) |
| { |
| unsigned int target_shndx = shdr.get_sh_info(); |
| if (target_shndx == 0 || target_shndx >= shnum) |
| { |
| this->error(_("relocation section %u has bad info %u"), |
| i, target_shndx); |
| continue; |
| } |
| |
| if (reloc_shndx[target_shndx] != 0) |
| reloc_shndx[target_shndx] = -1U; |
| else |
| { |
| reloc_shndx[target_shndx] = i; |
| reloc_type[target_shndx] = sh_type; |
| } |
| } |
| } |
| |
| std::vector<Map_to_output>& map_sections(this->map_to_output()); |
| map_sections.resize(shnum); |
| |
| // Whether we've seen a .note.GNU-stack section. |
| bool seen_gnu_stack = false; |
| // The flags of a .note.GNU-stack section. |
| uint64_t gnu_stack_flags = 0; |
| |
| // Keep track of which sections to omit. |
| std::vector<bool> omit(shnum, false); |
| |
| // Keep track of .eh_frame sections. |
| std::vector<unsigned int> eh_frame_sections; |
| |
| // Skip the first, dummy, section. |
| pshdrs = sd->section_headers->data() + This::shdr_size; |
| for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
| { |
| typename This::Shdr shdr(pshdrs); |
| |
| if (shdr.get_sh_name() >= sd->section_names_size) |
| { |
| this->error(_("bad section name offset for section %u: %lu"), |
| i, static_cast<unsigned long>(shdr.get_sh_name())); |
| return; |
| } |
| |
| const char* name = pnames + shdr.get_sh_name(); |
| |
| if (this->handle_gnu_warning_section(name, i, symtab)) |
| { |
| if (!parameters->output_is_object()) |
| omit[i] = true; |
| } |
| |
| // The .note.GNU-stack section is special. It gives the |
| // protection flags that this object file requires for the stack |
| // in memory. |
| if (strcmp(name, ".note.GNU-stack") == 0) |
| { |
| seen_gnu_stack = true; |
| gnu_stack_flags |= shdr.get_sh_flags(); |
| omit[i] = true; |
| } |
| |
| bool discard = omit[i]; |
| if (!discard) |
| { |
| if (shdr.get_sh_type() == elfcpp::SHT_GROUP) |
| { |
| if (!this->include_section_group(layout, i, shdr, &omit)) |
| discard = true; |
| } |
| else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0 |
| && Layout::is_linkonce(name)) |
| { |
| if (!this->include_linkonce_section(layout, name, shdr)) |
| discard = true; |
| } |
| } |
| |
| if (discard) |
| { |
| // Do not include this section in the link. |
| map_sections[i].output_section = NULL; |
| continue; |
| } |
| |
| // The .eh_frame section is special. It holds exception frame |
| // information that we need to read in order to generate the |
| // exception frame header. We process these after all the other |
| // sections so that the exception frame reader can reliably |
| // determine which sections are being discarded, and discard the |
| // corresponding information. |
| if (!parameters->output_is_object() |
| && strcmp(name, ".eh_frame") == 0 |
| && this->check_eh_frame_flags(&shdr)) |
| { |
| eh_frame_sections.push_back(i); |
| continue; |
| } |
| |
| off_t offset; |
| Output_section* os = layout->layout(this, i, name, shdr, |
| reloc_shndx[i], reloc_type[i], |
| &offset); |
| |
| map_sections[i].output_section = os; |
| map_sections[i].offset = offset; |
| |
| // If this section requires special handling, and if there are |
| // relocs that apply to it, then we must do the special handling |
| // before we apply the relocs. |
| if (offset == -1 && reloc_shndx[i] != 0) |
| this->set_relocs_must_follow_section_writes(); |
| } |
| |
| layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags); |
| |
| // Handle the .eh_frame sections at the end. |
| for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin(); |
| p != eh_frame_sections.end(); |
| ++p) |
| { |
| gold_assert(this->has_eh_frame_); |
| gold_assert(sd->external_symbols_offset != 0); |
| |
| unsigned int i = *p; |
| const unsigned char *pshdr; |
| pshdr = sd->section_headers->data() + i * This::shdr_size; |
| typename This::Shdr shdr(pshdr); |
| |
| off_t offset; |
| Output_section* os = layout->layout_eh_frame(this, |
| sd->symbols->data(), |
| sd->symbols_size, |
| sd->symbol_names->data(), |
| sd->symbol_names_size, |
| i, shdr, |
| reloc_shndx[i], |
| reloc_type[i], |
| &offset); |
| map_sections[i].output_section = os; |
| map_sections[i].offset = offset; |
| |
| // If this section requires special handling, and if there are |
| // relocs that apply to it, then we must do the special handling |
| // before we apply the relocs. |
| if (offset == -1 && reloc_shndx[i] != 0) |
| this->set_relocs_must_follow_section_writes(); |
| } |
| |
| delete sd->section_headers; |
| sd->section_headers = NULL; |
| delete sd->section_names; |
| sd->section_names = NULL; |
| } |
| |
| // Add the symbols to the symbol table. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
| Read_symbols_data* sd) |
| { |
| if (sd->symbols == NULL) |
| { |
| gold_assert(sd->symbol_names == NULL); |
| return; |
| } |
| |
| const int sym_size = This::sym_size; |
| size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
| / sym_size); |
| if (symcount * sym_size != sd->symbols_size - sd->external_symbols_offset) |
| { |
| this->error(_("size of symbols is not multiple of symbol size")); |
| return; |
| } |
| |
| this->symbols_.resize(symcount); |
| |
| const char* sym_names = |
| reinterpret_cast<const char*>(sd->symbol_names->data()); |
| symtab->add_from_relobj(this, |
| sd->symbols->data() + sd->external_symbols_offset, |
| symcount, sym_names, sd->symbol_names_size, |
| &this->symbols_); |
| |
| delete sd->symbols; |
| sd->symbols = NULL; |
| delete sd->symbol_names; |
| sd->symbol_names = NULL; |
| } |
| |
| // First pass over the local symbols. Here we add their names to |
| // *POOL and *DYNPOOL, and we store the symbol value in |
| // THIS->LOCAL_VALUES_. This function is always called from a |
| // singleton thread. This is followed by a call to |
| // finalize_local_symbols. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::do_count_local_symbols(Stringpool* pool, |
| Stringpool* dynpool) |
| { |
| gold_assert(this->symtab_shndx_ != -1U); |
| if (this->symtab_shndx_ == 0) |
| { |
| // This object has no symbols. Weird but legal. |
| return; |
| } |
| |
| // Read the symbol table section header. |
| const unsigned int symtab_shndx = this->symtab_shndx_; |
| typename This::Shdr symtabshdr(this, |
| this->elf_file_.section_header(symtab_shndx)); |
| gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| |
| // Read the local symbols. |
| const int sym_size = This::sym_size; |
| const unsigned int loccount = this->local_symbol_count_; |
| gold_assert(loccount == symtabshdr.get_sh_info()); |
| off_t locsize = loccount * sym_size; |
| const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
| locsize, true); |
| |
| // Read the symbol names. |
| const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
| section_size_type strtab_size; |
| const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
| &strtab_size, |
| true); |
| const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| |
| // Loop over the local symbols. |
| |
| const std::vector<Map_to_output>& mo(this->map_to_output()); |
| unsigned int shnum = this->shnum(); |
| unsigned int count = 0; |
| unsigned int dyncount = 0; |
| // Skip the first, dummy, symbol. |
| psyms += sym_size; |
| for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| { |
| elfcpp::Sym<size, big_endian> sym(psyms); |
| |
| Symbol_value<size>& lv(this->local_values_[i]); |
| |
| unsigned int shndx = sym.get_st_shndx(); |
| lv.set_input_shndx(shndx); |
| |
| if (sym.get_st_type() == elfcpp::STT_SECTION) |
| lv.set_is_section_symbol(); |
| else if (sym.get_st_type() == elfcpp::STT_TLS) |
| lv.set_is_tls_symbol(); |
| |
| // Save the input symbol value for use in do_finalize_local_symbols(). |
| lv.set_input_value(sym.get_st_value()); |
| |
| // Decide whether this symbol should go into the output file. |
| |
| if (shndx < shnum && mo[shndx].output_section == NULL) |
| { |
| lv.set_no_output_symtab_entry(); |
| continue; |
| } |
| |
| if (sym.get_st_type() == elfcpp::STT_SECTION) |
| { |
| lv.set_no_output_symtab_entry(); |
| continue; |
| } |
| |
| if (sym.get_st_name() >= strtab_size) |
| { |
| this->error(_("local symbol %u section name out of range: %u >= %u"), |
| i, sym.get_st_name(), |
| static_cast<unsigned int>(strtab_size)); |
| lv.set_no_output_symtab_entry(); |
| continue; |
| } |
| |
| // Add the symbol to the symbol table string pool. |
| const char* name = pnames + sym.get_st_name(); |
| pool->add(name, true, NULL); |
| ++count; |
| |
| // If needed, add the symbol to the dynamic symbol table string pool. |
| if (lv.needs_output_dynsym_entry()) |
| { |
| dynpool->add(name, true, NULL); |
| ++dyncount; |
| } |
| } |
| |
| this->output_local_symbol_count_ = count; |
| this->output_local_dynsym_count_ = dyncount; |
| } |
| |
| // Finalize the local symbols. Here we set the final value in |
| // THIS->LOCAL_VALUES_ and set their output symbol table indexes. |
| // This function is always called from a singleton thread. The actual |
| // output of the local symbols will occur in a separate task. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index, |
| off_t off) |
| { |
| gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); |
| |
| const unsigned int loccount = this->local_symbol_count_; |
| this->local_symbol_offset_ = off; |
| |
| const std::vector<Map_to_output>& mo(this->map_to_output()); |
| unsigned int shnum = this->shnum(); |
| |
| for (unsigned int i = 1; i < loccount; ++i) |
| { |
| Symbol_value<size>& lv(this->local_values_[i]); |
| |
| unsigned int shndx = lv.input_shndx(); |
| |
| // Set the output symbol value. |
| |
| if (shndx >= elfcpp::SHN_LORESERVE) |
| { |
| if (shndx == elfcpp::SHN_ABS) |
| lv.set_output_value(lv.input_value()); |
| else |
| { |
| // FIXME: Handle SHN_XINDEX. |
| this->error(_("unknown section index %u for local symbol %u"), |
| shndx, i); |
| lv.set_output_value(0); |
| } |
| } |
| else |
| { |
| if (shndx >= shnum) |
| { |
| this->error(_("local symbol %u section index %u out of range"), |
| i, shndx); |
| shndx = 0; |
| } |
| |
| Output_section* os = mo[shndx].output_section; |
| |
| if (os == NULL) |
| { |
| lv.set_output_value(0); |
| continue; |
| } |
| else if (mo[shndx].offset == -1) |
| { |
| // This is a SHF_MERGE section or one which otherwise |
| // requires special handling. We get the output address |
| // of the start of the merged section. If this is not a |
| // section symbol, we can then determine the final |
| // value. If it is a section symbol, we can not, as in |
| // that case we have to consider the addend to determine |
| // the value to use in a relocation. |
| if (!lv.is_section_symbol()) |
| lv.set_output_value(os->output_address(this, shndx, |
| lv.input_value())); |
| else |
| { |
| section_offset_type start = |
| os->starting_output_address(this, shndx); |
| Merged_symbol_value<size>* msv = |
| new Merged_symbol_value<size>(lv.input_value(), start); |
| lv.set_merged_symbol_value(msv); |
| } |
| } |
| else if (lv.is_tls_symbol()) |
| lv.set_output_value(os->tls_offset() |
| + mo[shndx].offset |
| + lv.input_value()); |
| else |
| lv.set_output_value(os->address() |
| + mo[shndx].offset |
| + lv.input_value()); |
| } |
| |
| if (lv.needs_output_symtab_entry()) |
| { |
| lv.set_output_symtab_index(index); |
| ++index; |
| } |
| } |
| return index; |
| } |
| |
| // Set the output dynamic symbol table indexes for the local variables. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Sized_relobj<size, big_endian>::do_set_local_dynsym_indexes(unsigned int index) |
| { |
| const unsigned int loccount = this->local_symbol_count_; |
| for (unsigned int i = 1; i < loccount; ++i) |
| { |
| Symbol_value<size>& lv(this->local_values_[i]); |
| if (lv.needs_output_dynsym_entry()) |
| { |
| lv.set_output_dynsym_index(index); |
| ++index; |
| } |
| } |
| return index; |
| } |
| |
| // Set the offset where local dynamic symbol information will be stored. |
| // Returns the count of local symbols contributed to the symbol table by |
| // this object. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Sized_relobj<size, big_endian>::do_set_local_dynsym_offset(off_t off) |
| { |
| gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); |
| this->local_dynsym_offset_ = off; |
| return this->output_local_dynsym_count_; |
| } |
| |
| // Return the value of the local symbol symndx. |
| template<int size, bool big_endian> |
| typename elfcpp::Elf_types<size>::Elf_Addr |
| Sized_relobj<size, big_endian>::local_symbol_value(unsigned int symndx) const |
| { |
| gold_assert(symndx < this->local_symbol_count_); |
| gold_assert(symndx < this->local_values_.size()); |
| const Symbol_value<size>& lv(this->local_values_[symndx]); |
| return lv.value(this, 0); |
| } |
| |
| // Write out the local symbols. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::write_local_symbols( |
| Output_file* of, |
| const Stringpool* sympool, |
| const Stringpool* dynpool) |
| { |
| if (parameters->strip_all() && this->output_local_dynsym_count_ == 0) |
| return; |
| |
| gold_assert(this->symtab_shndx_ != -1U); |
| if (this->symtab_shndx_ == 0) |
| { |
| // This object has no symbols. Weird but legal. |
| return; |
| } |
| |
| // Read the symbol table section header. |
| const unsigned int symtab_shndx = this->symtab_shndx_; |
| typename This::Shdr symtabshdr(this, |
| this->elf_file_.section_header(symtab_shndx)); |
| gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| const unsigned int loccount = this->local_symbol_count_; |
| gold_assert(loccount == symtabshdr.get_sh_info()); |
| |
| // Read the local symbols. |
| const int sym_size = This::sym_size; |
| off_t locsize = loccount * sym_size; |
| const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
| locsize, false); |
| |
| // Read the symbol names. |
| const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
| section_size_type strtab_size; |
| const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
| &strtab_size, |
| false); |
| const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| |
| // Get views into the output file for the portions of the symbol table |
| // and the dynamic symbol table that we will be writing. |
| off_t output_size = this->output_local_symbol_count_ * sym_size; |
| unsigned char* oview = NULL; |
| if (output_size > 0) |
| oview = of->get_output_view(this->local_symbol_offset_, output_size); |
| |
| off_t dyn_output_size = this->output_local_dynsym_count_ * sym_size; |
| unsigned char* dyn_oview = NULL; |
| if (dyn_output_size > 0) |
| dyn_oview = of->get_output_view(this->local_dynsym_offset_, |
| dyn_output_size); |
| |
| const std::vector<Map_to_output>& mo(this->map_to_output()); |
| |
| gold_assert(this->local_values_.size() == loccount); |
| |
| unsigned char* ov = oview; |
| unsigned char* dyn_ov = dyn_oview; |
| psyms += sym_size; |
| for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| { |
| elfcpp::Sym<size, big_endian> isym(psyms); |
| |
| unsigned int st_shndx = isym.get_st_shndx(); |
| if (st_shndx < elfcpp::SHN_LORESERVE) |
| { |
| gold_assert(st_shndx < mo.size()); |
| if (mo[st_shndx].output_section == NULL) |
| continue; |
| st_shndx = mo[st_shndx].output_section->out_shndx(); |
| } |
| |
| // Write the symbol to the output symbol table. |
| if (!parameters->strip_all() |
| && this->local_values_[i].needs_output_symtab_entry()) |
| { |
| elfcpp::Sym_write<size, big_endian> osym(ov); |
| |
| gold_assert(isym.get_st_name() < strtab_size); |
| const char* name = pnames + isym.get_st_name(); |
| osym.put_st_name(sympool->get_offset(name)); |
| osym.put_st_value(this->local_values_[i].value(this, 0)); |
| osym.put_st_size(isym.get_st_size()); |
| osym.put_st_info(isym.get_st_info()); |
| osym.put_st_other(isym.get_st_other()); |
| osym.put_st_shndx(st_shndx); |
| |
| ov += sym_size; |
| } |
| |
| // Write the symbol to the output dynamic symbol table. |
| if (this->local_values_[i].needs_output_dynsym_entry()) |
| { |
| gold_assert(dyn_ov < dyn_oview + dyn_output_size); |
| elfcpp::Sym_write<size, big_endian> osym(dyn_ov); |
| |
| gold_assert(isym.get_st_name() < strtab_size); |
| const char* name = pnames + isym.get_st_name(); |
| osym.put_st_name(dynpool->get_offset(name)); |
| osym.put_st_value(this->local_values_[i].value(this, 0)); |
| osym.put_st_size(isym.get_st_size()); |
| osym.put_st_info(isym.get_st_info()); |
| osym.put_st_other(isym.get_st_other()); |
| osym.put_st_shndx(st_shndx); |
| |
| dyn_ov += sym_size; |
| } |
| } |
| |
| |
| if (output_size > 0) |
| { |
| gold_assert(ov - oview == output_size); |
| of->write_output_view(this->local_symbol_offset_, output_size, oview); |
| } |
| |
| if (dyn_output_size > 0) |
| { |
| gold_assert(dyn_ov - dyn_oview == dyn_output_size); |
| of->write_output_view(this->local_dynsym_offset_, dyn_output_size, |
| dyn_oview); |
| } |
| } |
| |
| // Set *INFO to symbolic information about the offset OFFSET in the |
| // section SHNDX. Return true if we found something, false if we |
| // found nothing. |
| |
| template<int size, bool big_endian> |
| bool |
| Sized_relobj<size, big_endian>::get_symbol_location_info( |
| unsigned int shndx, |
| off_t offset, |
| Symbol_location_info* info) |
| { |
| if (this->symtab_shndx_ == 0) |
| return false; |
| |
| section_size_type symbols_size; |
| const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
| &symbols_size, |
| false); |
| |
| unsigned int symbol_names_shndx = this->section_link(this->symtab_shndx_); |
| section_size_type names_size; |
| const unsigned char* symbol_names_u = |
| this->section_contents(symbol_names_shndx, &names_size, false); |
| const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u); |
| |
| const int sym_size = This::sym_size; |
| const size_t count = symbols_size / sym_size; |
| |
| const unsigned char* p = symbols; |
| for (size_t i = 0; i < count; ++i, p += sym_size) |
| { |
| elfcpp::Sym<size, big_endian> sym(p); |
| |
| if (sym.get_st_type() == elfcpp::STT_FILE) |
| { |
| if (sym.get_st_name() >= names_size) |
| info->source_file = "(invalid)"; |
| else |
| info->source_file = symbol_names + sym.get_st_name(); |
| } |
| else if (sym.get_st_shndx() == shndx |
| && static_cast<off_t>(sym.get_st_value()) <= offset |
| && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size()) |
| > offset)) |
| { |
| if (sym.get_st_name() > names_size) |
| info->enclosing_symbol_name = "(invalid)"; |
| else |
| { |
| info->enclosing_symbol_name = symbol_names + sym.get_st_name(); |
| if (parameters->demangle()) |
| { |
| char* demangled_name = cplus_demangle( |
| info->enclosing_symbol_name.c_str(), |
| DMGL_ANSI | DMGL_PARAMS); |
| if (demangled_name != NULL) |
| { |
| info->enclosing_symbol_name.assign(demangled_name); |
| free(demangled_name); |
| } |
| } |
| } |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| // Input_objects methods. |
| |
| // Add a regular relocatable object to the list. Return false if this |
| // object should be ignored. |
| |
| bool |
| Input_objects::add_object(Object* obj) |
| { |
| Target* target = obj->target(); |
| if (this->target_ == NULL) |
| this->target_ = target; |
| else if (this->target_ != target) |
| { |
| gold_error(_("%s: incompatible target"), obj->name().c_str()); |
| return false; |
| } |
| |
| if (!obj->is_dynamic()) |
| this->relobj_list_.push_back(static_cast<Relobj*>(obj)); |
| else |
| { |
| // See if this is a duplicate SONAME. |
| Dynobj* dynobj = static_cast<Dynobj*>(obj); |
| const char* soname = dynobj->soname(); |
| |
| std::pair<Unordered_set<std::string>::iterator, bool> ins = |
| this->sonames_.insert(soname); |
| if (!ins.second) |
| { |
| // We have already seen a dynamic object with this soname. |
| return false; |
| } |
| |
| this->dynobj_list_.push_back(dynobj); |
| |
| // If this is -lc, remember the directory in which we found it. |
| // We use this when issuing warnings about undefined symbols: as |
| // a heuristic, we don't warn about system libraries found in |
| // the same directory as -lc. |
| if (strncmp(soname, "libc.so", 7) == 0) |
| { |
| const char* object_name = dynobj->name().c_str(); |
| const char* base = lbasename(object_name); |
| if (base != object_name) |
| this->system_library_directory_.assign(object_name, |
| base - 1 - object_name); |
| } |
| } |
| |
| set_parameters_target(target); |
| |
| return true; |
| } |
| |
| // Return whether an object was found in the system library directory. |
| |
| bool |
| Input_objects::found_in_system_library_directory(const Object* object) const |
| { |
| return (!this->system_library_directory_.empty() |
| && object->name().compare(0, |
| this->system_library_directory_.size(), |
| this->system_library_directory_) == 0); |
| } |
| |
| // For each dynamic object, record whether we've seen all of its |
| // explicit dependencies. |
| |
| void |
| Input_objects::check_dynamic_dependencies() const |
| { |
| for (Dynobj_list::const_iterator p = this->dynobj_list_.begin(); |
| p != this->dynobj_list_.end(); |
| ++p) |
| { |
| const Dynobj::Needed& needed((*p)->needed()); |
| bool found_all = true; |
| for (Dynobj::Needed::const_iterator pneeded = needed.begin(); |
| pneeded != needed.end(); |
| ++pneeded) |
| { |
| if (this->sonames_.find(*pneeded) == this->sonames_.end()) |
| { |
| found_all = false; |
| break; |
| } |
| } |
| (*p)->set_has_unknown_needed_entries(!found_all); |
| } |
| } |
| |
| // Relocate_info methods. |
| |
| // Return a string describing the location of a relocation. This is |
| // only used in error messages. |
| |
| template<int size, bool big_endian> |
| std::string |
| Relocate_info<size, big_endian>::location(size_t, off_t offset) const |
| { |
| // See if we can get line-number information from debugging sections. |
| std::string filename; |
| std::string file_and_lineno; // Better than filename-only, if available. |
| |
| Sized_dwarf_line_info<size, big_endian> line_info(this->object); |
| // This will be "" if we failed to parse the debug info for any reason. |
| file_and_lineno = line_info.addr2line(this->data_shndx, offset); |
| |
| std::string ret(this->object->name()); |
| ret += ':'; |
| Symbol_location_info info; |
| if (this->object->get_symbol_location_info(this->data_shndx, offset, &info)) |
| { |
| ret += " in function "; |
| ret += info.enclosing_symbol_name; |
| ret += ":"; |
| filename = info.source_file; |
| } |
| |
| if (!file_and_lineno.empty()) |
| ret += file_and_lineno; |
| else |
| { |
| if (!filename.empty()) |
| ret += filename; |
| ret += "("; |
| ret += this->object->section_name(this->data_shndx); |
| char buf[100]; |
| // Offsets into sections have to be positive. |
| snprintf(buf, sizeof(buf), "+0x%lx", static_cast<long>(offset)); |
| ret += buf; |
| ret += ")"; |
| } |
| return ret; |
| } |
| |
| } // End namespace gold. |
| |
| namespace |
| { |
| |
| using namespace gold; |
| |
| // Read an ELF file with the header and return the appropriate |
| // instance of Object. |
| |
| template<int size, bool big_endian> |
| Object* |
| make_elf_sized_object(const std::string& name, Input_file* input_file, |
| off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) |
| { |
| int et = ehdr.get_e_type(); |
| if (et == elfcpp::ET_REL) |
| { |
| Sized_relobj<size, big_endian>* obj = |
| new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr); |
| obj->setup(ehdr); |
| return obj; |
| } |
| else if (et == elfcpp::ET_DYN) |
| { |
| Sized_dynobj<size, big_endian>* obj = |
| new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); |
| obj->setup(ehdr); |
| return obj; |
| } |
| else |
| { |
| gold_error(_("%s: unsupported ELF file type %d"), |
| name.c_str(), et); |
| return NULL; |
| } |
| } |
| |
| } // End anonymous namespace. |
| |
| namespace gold |
| { |
| |
| // Read an ELF file and return the appropriate instance of Object. |
| |
| Object* |
| make_elf_object(const std::string& name, Input_file* input_file, off_t offset, |
| const unsigned char* p, section_offset_type bytes) |
| { |
| if (bytes < elfcpp::EI_NIDENT) |
| { |
| gold_error(_("%s: ELF file too short"), name.c_str()); |
| return NULL; |
| } |
| |
| int v = p[elfcpp::EI_VERSION]; |
| if (v != elfcpp::EV_CURRENT) |
| { |
| if (v == elfcpp::EV_NONE) |
| gold_error(_("%s: invalid ELF version 0"), name.c_str()); |
| else |
| gold_error(_("%s: unsupported ELF version %d"), name.c_str(), v); |
| return NULL; |
| } |
| |
| int c = p[elfcpp::EI_CLASS]; |
| if (c == elfcpp::ELFCLASSNONE) |
| { |
| gold_error(_("%s: invalid ELF class 0"), name.c_str()); |
| return NULL; |
| } |
| else if (c != elfcpp::ELFCLASS32 |
| && c != elfcpp::ELFCLASS64) |
| { |
| gold_error(_("%s: unsupported ELF class %d"), name.c_str(), c); |
| return NULL; |
| } |
| |
| int d = p[elfcpp::EI_DATA]; |
| if (d == elfcpp::ELFDATANONE) |
| { |
| gold_error(_("%s: invalid ELF data encoding"), name.c_str()); |
| return NULL; |
| } |
| else if (d != elfcpp::ELFDATA2LSB |
| && d != elfcpp::ELFDATA2MSB) |
| { |
| gold_error(_("%s: unsupported ELF data encoding %d"), name.c_str(), d); |
| return NULL; |
| } |
| |
| bool big_endian = d == elfcpp::ELFDATA2MSB; |
| |
| if (c == elfcpp::ELFCLASS32) |
| { |
| if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) |
| { |
| gold_error(_("%s: ELF file too short"), name.c_str()); |
| return NULL; |
| } |
| if (big_endian) |
| { |
| #ifdef HAVE_TARGET_32_BIG |
| elfcpp::Ehdr<32, true> ehdr(p); |
| return make_elf_sized_object<32, true>(name, input_file, |
| offset, ehdr); |
| #else |
| gold_error(_("%s: not configured to support " |
| "32-bit big-endian object"), |
| name.c_str()); |
| return NULL; |
| #endif |
| } |
| else |
| { |
| #ifdef HAVE_TARGET_32_LITTLE |
| elfcpp::Ehdr<32, false> ehdr(p); |
| return make_elf_sized_object<32, false>(name, input_file, |
| offset, ehdr); |
| #else |
| gold_error(_("%s: not configured to support " |
| "32-bit little-endian object"), |
| name.c_str()); |
| return NULL; |
| #endif |
| } |
| } |
| else |
| { |
| if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) |
| { |
| gold_error(_("%s: ELF file too short"), name.c_str()); |
| return NULL; |
| } |
| if (big_endian) |
| { |
| #ifdef HAVE_TARGET_64_BIG |
| elfcpp::Ehdr<64, true> ehdr(p); |
| return make_elf_sized_object<64, true>(name, input_file, |
| offset, ehdr); |
| #else |
| gold_error(_("%s: not configured to support " |
| "64-bit big-endian object"), |
| name.c_str()); |
| return NULL; |
| #endif |
| } |
| else |
| { |
| #ifdef HAVE_TARGET_64_LITTLE |
| elfcpp::Ehdr<64, false> ehdr(p); |
| return make_elf_sized_object<64, false>(name, input_file, |
| offset, ehdr); |
| #else |
| gold_error(_("%s: not configured to support " |
| "64-bit little-endian object"), |
| name.c_str()); |
| return NULL; |
| #endif |
| } |
| } |
| } |
| |
| // Instantiate the templates we need. We could use the configure |
| // script to restrict this to only the ones for implemented targets. |
| |
| #ifdef HAVE_TARGET_32_LITTLE |
| template |
| class Sized_relobj<32, false>; |
| #endif |
| |
| #ifdef HAVE_TARGET_32_BIG |
| template |
| class Sized_relobj<32, true>; |
| #endif |
| |
| #ifdef HAVE_TARGET_64_LITTLE |
| template |
| class Sized_relobj<64, false>; |
| #endif |
| |
| #ifdef HAVE_TARGET_64_BIG |
| template |
| class Sized_relobj<64, true>; |
| #endif |
| |
| #ifdef HAVE_TARGET_32_LITTLE |
| template |
| struct Relocate_info<32, false>; |
| #endif |
| |
| #ifdef HAVE_TARGET_32_BIG |
| template |
| struct Relocate_info<32, true>; |
| #endif |
| |
| #ifdef HAVE_TARGET_64_LITTLE |
| template |
| struct Relocate_info<64, false>; |
| #endif |
| |
| #ifdef HAVE_TARGET_64_BIG |
| template |
| struct Relocate_info<64, true>; |
| #endif |
| |
| } // End namespace gold. |