922 lines
26 KiB
C++
922 lines
26 KiB
C++
// object.cc -- support for an object file for linking in gold
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#include "gold.h"
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#include <cerrno>
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#include <cstring>
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#include <cassert>
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#include <cstdarg>
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#include "target-select.h"
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#include "layout.h"
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#include "output.h"
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#include "symtab.h"
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#include "object.h"
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#include "dynobj.h"
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namespace gold
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{
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// Class Object.
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// Set the target based on fields in the ELF file header.
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void
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Object::set_target(int machine, int size, bool big_endian, int osabi,
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int abiversion)
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{
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Target* target = select_target(machine, size, big_endian, osabi, abiversion);
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if (target == NULL)
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{
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fprintf(stderr, _("%s: %s: unsupported ELF machine number %d\n"),
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program_name, this->name().c_str(), machine);
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gold_exit(false);
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}
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this->target_ = target;
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}
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// Report an error for the elfcpp::Elf_file interface.
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void
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Object::error(const char* format, ...)
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{
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va_list args;
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fprintf(stderr, "%s: %s: ", program_name, this->name().c_str());
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va_start(args, format);
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vfprintf(stderr, format, args);
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va_end(args);
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putc('\n', stderr);
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gold_exit(false);
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}
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// Return a view of the contents of a section.
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const unsigned char*
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Object::section_contents(unsigned int shndx, off_t* plen)
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{
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Location loc(this->do_section_contents(shndx));
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*plen = loc.data_size;
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return this->get_view(loc.file_offset, loc.data_size);
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}
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// Read the section data into SD. This is code common to Sized_relobj
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// and Sized_dynobj, so we put it into Object.
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template<int size, bool big_endian>
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void
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Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file,
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Read_symbols_data* sd)
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{
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const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
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// Read the section headers.
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const off_t shoff = elf_file->shoff();
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const unsigned int shnum = this->shnum();
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sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size);
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// Read the section names.
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const unsigned char* pshdrs = sd->section_headers->data();
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const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size;
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typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames);
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if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB)
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{
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fprintf(stderr,
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_("%s: %s: section name section has wrong type: %u\n"),
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program_name, this->name().c_str(),
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static_cast<unsigned int>(shdrnames.get_sh_type()));
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gold_exit(false);
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}
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sd->section_names_size = shdrnames.get_sh_size();
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sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(),
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sd->section_names_size);
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}
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// If NAME is the name of a special .gnu.warning section, arrange for
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// the warning to be issued. SHNDX is the section index. Return
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// whether it is a warning section.
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bool
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Object::handle_gnu_warning_section(const char* name, unsigned int shndx,
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Symbol_table* symtab)
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{
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const char warn_prefix[] = ".gnu.warning.";
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const int warn_prefix_len = sizeof warn_prefix - 1;
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if (strncmp(name, warn_prefix, warn_prefix_len) == 0)
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{
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symtab->add_warning(name + warn_prefix_len, this, shndx);
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return true;
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}
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return false;
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}
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// Class Sized_relobj.
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template<int size, bool big_endian>
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Sized_relobj<size, big_endian>::Sized_relobj(
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const std::string& name,
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Input_file* input_file,
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off_t offset,
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const elfcpp::Ehdr<size, big_endian>& ehdr)
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: Relobj(name, input_file, offset),
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elf_file_(this, ehdr),
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symtab_shndx_(-1U),
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local_symbol_count_(0),
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output_local_symbol_count_(0),
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symbols_(NULL),
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local_symbol_offset_(0),
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values_(NULL)
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{
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}
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template<int size, bool big_endian>
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Sized_relobj<size, big_endian>::~Sized_relobj()
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{
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}
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// Set up an object file based on the file header. This sets up the
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// target and reads the section information.
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template<int size, bool big_endian>
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void
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Sized_relobj<size, big_endian>::setup(
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const elfcpp::Ehdr<size, big_endian>& ehdr)
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{
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this->set_target(ehdr.get_e_machine(), size, big_endian,
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ehdr.get_e_ident()[elfcpp::EI_OSABI],
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ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
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const unsigned int shnum = this->elf_file_.shnum();
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this->set_shnum(shnum);
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}
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// Find the SHT_SYMTAB section, given the section headers. The ELF
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// standard says that maybe in the future there can be more than one
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// SHT_SYMTAB section. Until somebody figures out how that could
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// work, we assume there is only one.
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template<int size, bool big_endian>
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void
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Sized_relobj<size, big_endian>::find_symtab(const unsigned char* pshdrs)
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{
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const unsigned int shnum = this->shnum();
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this->symtab_shndx_ = 0;
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if (shnum > 0)
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{
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// Look through the sections in reverse order, since gas tends
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// to put the symbol table at the end.
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const unsigned char* p = pshdrs + shnum * This::shdr_size;
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unsigned int i = shnum;
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while (i > 0)
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{
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--i;
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p -= This::shdr_size;
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typename This::Shdr shdr(p);
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if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
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{
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this->symtab_shndx_ = i;
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break;
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}
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}
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}
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}
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// Read the sections and symbols from an object file.
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template<int size, bool big_endian>
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void
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Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
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{
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this->read_section_data(&this->elf_file_, sd);
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const unsigned char* const pshdrs = sd->section_headers->data();
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this->find_symtab(pshdrs);
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if (this->symtab_shndx_ == 0)
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{
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// No symbol table. Weird but legal.
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sd->symbols = NULL;
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sd->symbols_size = 0;
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sd->symbol_names = NULL;
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sd->symbol_names_size = 0;
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return;
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}
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// Get the symbol table section header.
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typename This::Shdr symtabshdr(pshdrs
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+ this->symtab_shndx_ * This::shdr_size);
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assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
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// We only need the external symbols.
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const int sym_size = This::sym_size;
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const unsigned int loccount = symtabshdr.get_sh_info();
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this->local_symbol_count_ = loccount;
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off_t locsize = loccount * sym_size;
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off_t extoff = symtabshdr.get_sh_offset() + locsize;
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off_t extsize = symtabshdr.get_sh_size() - locsize;
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// Read the symbol table.
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File_view* fvsymtab = this->get_lasting_view(extoff, extsize);
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// Read the section header for the symbol names.
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unsigned int strtab_shndx = symtabshdr.get_sh_link();
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if (strtab_shndx >= this->shnum())
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{
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fprintf(stderr, _("%s: %s: invalid symbol table name index: %u\n"),
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program_name, this->name().c_str(), strtab_shndx);
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gold_exit(false);
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}
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typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size);
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if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB)
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{
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fprintf(stderr,
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_("%s: %s: symbol table name section has wrong type: %u\n"),
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program_name, this->name().c_str(),
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static_cast<unsigned int>(strtabshdr.get_sh_type()));
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gold_exit(false);
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}
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// Read the symbol names.
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File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(),
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strtabshdr.get_sh_size());
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sd->symbols = fvsymtab;
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sd->symbols_size = extsize;
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sd->symbol_names = fvstrtab;
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sd->symbol_names_size = strtabshdr.get_sh_size();
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}
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// Return whether to include a section group in the link. LAYOUT is
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// used to keep track of which section groups we have already seen.
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// INDEX is the index of the section group and SHDR is the section
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// header. If we do not want to include this group, we set bits in
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// OMIT for each section which should be discarded.
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template<int size, bool big_endian>
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bool
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Sized_relobj<size, big_endian>::include_section_group(
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Layout* layout,
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unsigned int index,
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const elfcpp::Shdr<size, big_endian>& shdr,
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std::vector<bool>* omit)
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{
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// Read the section contents.
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const unsigned char* pcon = this->get_view(shdr.get_sh_offset(),
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shdr.get_sh_size());
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const elfcpp::Elf_Word* pword =
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reinterpret_cast<const elfcpp::Elf_Word*>(pcon);
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// The first word contains flags. We only care about COMDAT section
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// groups. Other section groups are always included in the link
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// just like ordinary sections.
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elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword);
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if ((flags & elfcpp::GRP_COMDAT) == 0)
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return true;
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// Look up the group signature, which is the name of a symbol. This
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// is a lot of effort to go to to read a string. Why didn't they
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// just use the name of the SHT_GROUP section as the group
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// signature?
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// Get the appropriate symbol table header (this will normally be
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// the single SHT_SYMTAB section, but in principle it need not be).
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const unsigned int link = shdr.get_sh_link();
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typename This::Shdr symshdr(this, this->elf_file_.section_header(link));
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// Read the symbol table entry.
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if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size)
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{
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fprintf(stderr, _("%s: %s: section group %u info %u out of range\n"),
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program_name, this->name().c_str(), index, shdr.get_sh_info());
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gold_exit(false);
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}
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off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size;
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const unsigned char* psym = this->get_view(symoff, This::sym_size);
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elfcpp::Sym<size, big_endian> sym(psym);
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// Read the symbol table names.
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off_t symnamelen;
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const unsigned char* psymnamesu;
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psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen);
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const char* psymnames = reinterpret_cast<const char*>(psymnamesu);
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// Get the section group signature.
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if (sym.get_st_name() >= symnamelen)
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{
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fprintf(stderr, _("%s: %s: symbol %u name offset %u out of range\n"),
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program_name, this->name().c_str(), shdr.get_sh_info(),
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sym.get_st_name());
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gold_exit(false);
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}
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const char* signature = psymnames + sym.get_st_name();
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// It seems that some versions of gas will create a section group
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// associated with a section symbol, and then fail to give a name to
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// the section symbol. In such a case, use the name of the section.
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// FIXME.
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std::string secname;
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if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION)
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{
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secname = this->section_name(sym.get_st_shndx());
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signature = secname.c_str();
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}
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// Record this section group, and see whether we've already seen one
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// with the same signature.
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if (layout->add_comdat(signature, true))
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return true;
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// This is a duplicate. We want to discard the sections in this
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// group.
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size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word);
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for (size_t i = 1; i < count; ++i)
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{
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elfcpp::Elf_Word secnum =
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elfcpp::Swap<32, big_endian>::readval(pword + i);
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if (secnum >= this->shnum())
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{
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fprintf(stderr,
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_("%s: %s: section %u in section group %u out of range"),
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program_name, this->name().c_str(), secnum,
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index);
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gold_exit(false);
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}
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(*omit)[secnum] = true;
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}
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return false;
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}
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// Whether to include a linkonce section in the link. NAME is the
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// name of the section and SHDR is the section header.
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// Linkonce sections are a GNU extension implemented in the original
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// GNU linker before section groups were defined. The semantics are
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// that we only include one linkonce section with a given name. The
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// name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
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// where T is the type of section and SYMNAME is the name of a symbol.
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// In an attempt to make linkonce sections interact well with section
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// groups, we try to identify SYMNAME and use it like a section group
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// signature. We want to block section groups with that signature,
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// but not other linkonce sections with that signature. We also use
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// the full name of the linkonce section as a normal section group
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// signature.
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template<int size, bool big_endian>
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bool
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Sized_relobj<size, big_endian>::include_linkonce_section(
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Layout* layout,
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const char* name,
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const elfcpp::Shdr<size, big_endian>&)
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{
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const char* symname = strrchr(name, '.') + 1;
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bool include1 = layout->add_comdat(symname, false);
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bool include2 = layout->add_comdat(name, true);
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return include1 && include2;
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}
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// Lay out the input sections. We walk through the sections and check
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// whether they should be included in the link. If they should, we
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// pass them to the Layout object, which will return an output section
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// and an offset.
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template<int size, bool big_endian>
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void
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Sized_relobj<size, big_endian>::do_layout(const General_options& options,
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Symbol_table* symtab,
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Layout* layout,
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Read_symbols_data* sd)
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{
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const unsigned int shnum = this->shnum();
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if (shnum == 0)
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return;
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// Get the section headers.
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const unsigned char* pshdrs = sd->section_headers->data();
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// Get the section names.
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const unsigned char* pnamesu = sd->section_names->data();
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const char* pnames = reinterpret_cast<const char*>(pnamesu);
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std::vector<Map_to_output>& map_sections(this->map_to_output());
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map_sections.resize(shnum);
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// Keep track of which sections to omit.
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std::vector<bool> omit(shnum, false);
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// Skip the first, dummy, section.
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pshdrs += This::shdr_size;
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for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size)
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{
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typename This::Shdr shdr(pshdrs);
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if (shdr.get_sh_name() >= sd->section_names_size)
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{
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fprintf(stderr,
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_("%s: %s: bad section name offset for section %u: %lu\n"),
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program_name, this->name().c_str(), i,
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static_cast<unsigned long>(shdr.get_sh_name()));
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gold_exit(false);
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}
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const char* name = pnames + shdr.get_sh_name();
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if (this->handle_gnu_warning_section(name, i, symtab))
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{
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if (!options.is_relocatable())
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omit[i] = true;
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}
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bool discard = omit[i];
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if (!discard)
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{
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if (shdr.get_sh_type() == elfcpp::SHT_GROUP)
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{
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if (!this->include_section_group(layout, i, shdr, &omit))
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discard = true;
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}
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else if (Layout::is_linkonce(name))
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{
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if (!this->include_linkonce_section(layout, name, shdr))
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discard = true;
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}
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}
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if (discard)
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{
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// Do not include this section in the link.
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map_sections[i].output_section = NULL;
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continue;
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}
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off_t offset;
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Output_section* os = layout->layout(this, i, name, shdr, &offset);
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map_sections[i].output_section = os;
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map_sections[i].offset = offset;
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}
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delete sd->section_headers;
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sd->section_headers = NULL;
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delete sd->section_names;
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sd->section_names = NULL;
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}
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// Add the symbols to the symbol table.
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template<int size, bool big_endian>
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void
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Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
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Read_symbols_data* sd)
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{
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if (sd->symbols == NULL)
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{
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assert(sd->symbol_names == NULL);
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return;
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}
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const int sym_size = This::sym_size;
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size_t symcount = sd->symbols_size / sym_size;
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if (symcount * sym_size != sd->symbols_size)
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{
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fprintf(stderr,
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_("%s: %s: size of symbols is not multiple of symbol size\n"),
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program_name, this->name().c_str());
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gold_exit(false);
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}
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this->symbols_ = new Symbol*[symcount];
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|
|
const char* sym_names =
|
|
reinterpret_cast<const char*>(sd->symbol_names->data());
|
|
symtab->add_from_relobj(this, sd->symbols->data(), symcount, sym_names,
|
|
sd->symbol_names_size, this->symbols_);
|
|
|
|
delete sd->symbols;
|
|
sd->symbols = NULL;
|
|
delete sd->symbol_names;
|
|
sd->symbol_names = NULL;
|
|
}
|
|
|
|
// Finalize the local symbols. Here we record the file offset at
|
|
// which they should be output, we add their names to *POOL, and we
|
|
// add their values to THIS->VALUES_. Return the new file offset.
|
|
// This function is always called from the main thread. The actual
|
|
// output of the local symbols will occur in a separate task.
|
|
|
|
template<int size, bool big_endian>
|
|
off_t
|
|
Sized_relobj<size, big_endian>::do_finalize_local_symbols(off_t off,
|
|
Stringpool* pool)
|
|
{
|
|
assert(this->symtab_shndx_ != -1U);
|
|
if (this->symtab_shndx_ == 0)
|
|
{
|
|
// This object has no symbols. Weird but legal.
|
|
return off;
|
|
}
|
|
|
|
off = align_address(off, size >> 3);
|
|
|
|
this->local_symbol_offset_ = off;
|
|
|
|
// 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));
|
|
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_;
|
|
assert(loccount == symtabshdr.get_sh_info());
|
|
off_t locsize = loccount * sym_size;
|
|
const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
|
|
locsize);
|
|
|
|
this->values_ = new typename elfcpp::Elf_types<size>::Elf_Addr[loccount];
|
|
|
|
// Read the symbol names.
|
|
const unsigned int strtab_shndx = symtabshdr.get_sh_link();
|
|
off_t strtab_size;
|
|
const unsigned char* pnamesu = this->section_contents(strtab_shndx,
|
|
&strtab_size);
|
|
const char* pnames = reinterpret_cast<const char*>(pnamesu);
|
|
|
|
// Loop over the local symbols.
|
|
|
|
std::vector<Map_to_output>& mo(this->map_to_output());
|
|
unsigned int shnum = this->shnum();
|
|
unsigned int count = 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);
|
|
|
|
unsigned int shndx = sym.get_st_shndx();
|
|
|
|
if (shndx >= elfcpp::SHN_LORESERVE)
|
|
{
|
|
if (shndx == elfcpp::SHN_ABS)
|
|
this->values_[i] = sym.get_st_value();
|
|
else
|
|
{
|
|
// FIXME: Handle SHN_XINDEX.
|
|
fprintf(stderr,
|
|
_("%s: %s: unknown section index %u "
|
|
"for local symbol %u\n"),
|
|
program_name, this->name().c_str(), shndx, i);
|
|
gold_exit(false);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (shndx >= shnum)
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: %s: local symbol %u section index %u "
|
|
"out of range\n"),
|
|
program_name, this->name().c_str(), i, shndx);
|
|
gold_exit(false);
|
|
}
|
|
|
|
if (mo[shndx].output_section == NULL)
|
|
{
|
|
this->values_[i] = 0;
|
|
continue;
|
|
}
|
|
|
|
this->values_[i] = (mo[shndx].output_section->address()
|
|
+ mo[shndx].offset
|
|
+ sym.get_st_value());
|
|
}
|
|
|
|
if (sym.get_st_type() != elfcpp::STT_SECTION)
|
|
{
|
|
if (sym.get_st_name() >= strtab_size)
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: %s: local symbol %u section name "
|
|
"out of range: %u >= %u\n"),
|
|
program_name, this->name().c_str(),
|
|
i, sym.get_st_name(),
|
|
static_cast<unsigned int>(strtab_size));
|
|
gold_exit(false);
|
|
}
|
|
|
|
pool->add(pnames + sym.get_st_name(), NULL);
|
|
off += sym_size;
|
|
++count;
|
|
}
|
|
}
|
|
|
|
this->output_local_symbol_count_ = count;
|
|
|
|
return off;
|
|
}
|
|
|
|
// 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)
|
|
{
|
|
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));
|
|
assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
|
|
const unsigned int loccount = this->local_symbol_count_;
|
|
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);
|
|
|
|
// Read the symbol names.
|
|
const unsigned int strtab_shndx = symtabshdr.get_sh_link();
|
|
off_t strtab_size;
|
|
const unsigned char* pnamesu = this->section_contents(strtab_shndx,
|
|
&strtab_size);
|
|
const char* pnames = reinterpret_cast<const char*>(pnamesu);
|
|
|
|
// Get a view into the output file.
|
|
off_t output_size = this->output_local_symbol_count_ * sym_size;
|
|
unsigned char* oview = of->get_output_view(this->local_symbol_offset_,
|
|
output_size);
|
|
|
|
std::vector<Map_to_output>& mo(this->map_to_output());
|
|
|
|
psyms += sym_size;
|
|
unsigned char* ov = oview;
|
|
for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
|
|
{
|
|
elfcpp::Sym<size, big_endian> isym(psyms);
|
|
|
|
if (isym.get_st_type() == elfcpp::STT_SECTION)
|
|
continue;
|
|
|
|
unsigned int st_shndx = isym.get_st_shndx();
|
|
if (st_shndx < elfcpp::SHN_LORESERVE)
|
|
{
|
|
assert(st_shndx < mo.size());
|
|
if (mo[st_shndx].output_section == NULL)
|
|
continue;
|
|
st_shndx = mo[st_shndx].output_section->out_shndx();
|
|
}
|
|
|
|
elfcpp::Sym_write<size, big_endian> osym(ov);
|
|
|
|
assert(isym.get_st_name() < strtab_size);
|
|
osym.put_st_name(sympool->get_offset(pnames + isym.get_st_name()));
|
|
osym.put_st_value(this->values_[i]);
|
|
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;
|
|
}
|
|
|
|
assert(ov - oview == output_size);
|
|
|
|
of->write_output_view(this->local_symbol_offset_, output_size, oview);
|
|
}
|
|
|
|
// Input_objects methods.
|
|
|
|
// Add a regular relocatable object to the list.
|
|
|
|
void
|
|
Input_objects::add_object(Object* obj)
|
|
{
|
|
if (obj->is_dynamic())
|
|
this->dynobj_list_.push_back(static_cast<Dynobj*>(obj));
|
|
else
|
|
this->relobj_list_.push_back(static_cast<Relobj*>(obj));
|
|
|
|
Target* target = obj->target();
|
|
if (this->target_ == NULL)
|
|
this->target_ = target;
|
|
else if (this->target_ != target)
|
|
{
|
|
fprintf(stderr, "%s: %s: incompatible target\n",
|
|
program_name, obj->name().c_str());
|
|
gold_exit(false);
|
|
}
|
|
}
|
|
|
|
// 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 relnum, off_t) const
|
|
{
|
|
std::string ret(this->object->name());
|
|
ret += ": reloc ";
|
|
char buf[100];
|
|
snprintf(buf, sizeof buf, "%zu", relnum);
|
|
ret += buf;
|
|
ret += " in reloc section ";
|
|
snprintf(buf, sizeof buf, "%u", this->reloc_shndx);
|
|
ret += buf;
|
|
ret += " (" + this->object->section_name(this->reloc_shndx);
|
|
ret += ") for section ";
|
|
snprintf(buf, sizeof buf, "%u", this->data_shndx);
|
|
ret += buf;
|
|
ret += " (" + this->object->section_name(this->data_shndx) + ")";
|
|
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
|
|
{
|
|
fprintf(stderr, _("%s: %s: unsupported ELF file type %d\n"),
|
|
program_name, name.c_str(), et);
|
|
gold_exit(false);
|
|
}
|
|
}
|
|
|
|
} // 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, off_t bytes)
|
|
{
|
|
if (bytes < elfcpp::EI_NIDENT)
|
|
{
|
|
fprintf(stderr, _("%s: %s: ELF file too short\n"),
|
|
program_name, name.c_str());
|
|
gold_exit(false);
|
|
}
|
|
|
|
int v = p[elfcpp::EI_VERSION];
|
|
if (v != elfcpp::EV_CURRENT)
|
|
{
|
|
if (v == elfcpp::EV_NONE)
|
|
fprintf(stderr, _("%s: %s: invalid ELF version 0\n"),
|
|
program_name, name.c_str());
|
|
else
|
|
fprintf(stderr, _("%s: %s: unsupported ELF version %d\n"),
|
|
program_name, name.c_str(), v);
|
|
gold_exit(false);
|
|
}
|
|
|
|
int c = p[elfcpp::EI_CLASS];
|
|
if (c == elfcpp::ELFCLASSNONE)
|
|
{
|
|
fprintf(stderr, _("%s: %s: invalid ELF class 0\n"),
|
|
program_name, name.c_str());
|
|
gold_exit(false);
|
|
}
|
|
else if (c != elfcpp::ELFCLASS32
|
|
&& c != elfcpp::ELFCLASS64)
|
|
{
|
|
fprintf(stderr, _("%s: %s: unsupported ELF class %d\n"),
|
|
program_name, name.c_str(), c);
|
|
gold_exit(false);
|
|
}
|
|
|
|
int d = p[elfcpp::EI_DATA];
|
|
if (d == elfcpp::ELFDATANONE)
|
|
{
|
|
fprintf(stderr, _("%s: %s: invalid ELF data encoding\n"),
|
|
program_name, name.c_str());
|
|
gold_exit(false);
|
|
}
|
|
else if (d != elfcpp::ELFDATA2LSB
|
|
&& d != elfcpp::ELFDATA2MSB)
|
|
{
|
|
fprintf(stderr, _("%s: %s: unsupported ELF data encoding %d\n"),
|
|
program_name, name.c_str(), d);
|
|
gold_exit(false);
|
|
}
|
|
|
|
bool big_endian = d == elfcpp::ELFDATA2MSB;
|
|
|
|
if (c == elfcpp::ELFCLASS32)
|
|
{
|
|
if (bytes < elfcpp::Elf_sizes<32>::ehdr_size)
|
|
{
|
|
fprintf(stderr, _("%s: %s: ELF file too short\n"),
|
|
program_name, name.c_str());
|
|
gold_exit(false);
|
|
}
|
|
if (big_endian)
|
|
{
|
|
elfcpp::Ehdr<32, true> ehdr(p);
|
|
return make_elf_sized_object<32, true>(name, input_file,
|
|
offset, ehdr);
|
|
}
|
|
else
|
|
{
|
|
elfcpp::Ehdr<32, false> ehdr(p);
|
|
return make_elf_sized_object<32, false>(name, input_file,
|
|
offset, ehdr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (bytes < elfcpp::Elf_sizes<32>::ehdr_size)
|
|
{
|
|
fprintf(stderr, _("%s: %s: ELF file too short\n"),
|
|
program_name, name.c_str());
|
|
gold_exit(false);
|
|
}
|
|
if (big_endian)
|
|
{
|
|
elfcpp::Ehdr<64, true> ehdr(p);
|
|
return make_elf_sized_object<64, true>(name, input_file,
|
|
offset, ehdr);
|
|
}
|
|
else
|
|
{
|
|
elfcpp::Ehdr<64, false> ehdr(p);
|
|
return make_elf_sized_object<64, false>(name, input_file,
|
|
offset, ehdr);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Instantiate the templates we need. We could use the configure
|
|
// script to restrict this to only the ones for implemented targets.
|
|
|
|
template
|
|
class Sized_relobj<32, false>;
|
|
|
|
template
|
|
class Sized_relobj<32, true>;
|
|
|
|
template
|
|
class Sized_relobj<64, false>;
|
|
|
|
template
|
|
class Sized_relobj<64, true>;
|
|
|
|
template
|
|
struct Relocate_info<32, false>;
|
|
|
|
template
|
|
struct Relocate_info<32, true>;
|
|
|
|
template
|
|
struct Relocate_info<64, false>;
|
|
|
|
template
|
|
struct Relocate_info<64, true>;
|
|
|
|
} // End namespace gold.
|