// 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 <cassert>
+#include <cstdarg>
-#include "object.h"
#include "target-select.h"
#include "layout.h"
+#include "output.h"
+#include "symtab.h"
+#include "object.h"
+#include "dynobj.h"
namespace gold
{
// Class Object.
-const unsigned char*
-Object::get_view(off_t start, off_t size)
+// 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)
{
- return this->input_file_->file().get_view(start + this->offset_, size);
+ 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::read(off_t start, off_t size, void* p)
+Object::error(const char* format, ...) const
{
- this->input_file_->file().read(start + this->offset_, size, p);
+ 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);
}
-File_view*
-Object::get_lasting_view(off_t start, off_t size)
+// Return a view of the contents of a section.
+
+const unsigned char*
+Object::section_contents(unsigned int shndx, off_t* plen, bool cache)
{
- return this->input_file_->file().get_lasting_view(start + this->offset_,
- size);
+ Location loc(this->do_section_contents(shndx));
+ *plen = loc.data_size;
+ return this->get_view(loc.file_offset, loc.data_size, cache);
}
-// Class Sized_object.
+// 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>
-Sized_object<size, big_endian>::Sized_object(
- const std::string& name,
- Input_file* input_file,
- off_t offset,
- const elfcpp::Ehdr<size, big_endian>& ehdr)
- : Object(name, input_file, false, offset),
- flags_(ehdr.get_e_flags()),
- shoff_(ehdr.get_e_shoff()),
- shstrndx_(0),
- symtab_shnum_(0),
- symbols_(NULL),
- local_symbol_offset_(0)
+void
+Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file,
+ Read_symbols_data* sd)
{
- if (ehdr.get_e_ehsize() != This::ehdr_size)
- {
- fprintf(stderr, _("%s: %s: bad e_ehsize field (%d != %d)\n"),
- program_name, this->name().c_str(), ehdr.get_e_ehsize(),
- This::ehdr_size);
- gold_exit(false);
- }
- if (ehdr.get_e_shentsize() != This::shdr_size)
+ 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 = 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)
{
- fprintf(stderr, _("%s: %s: bad e_shentsize field (%d != %d)\n"),
- program_name, this->name().c_str(), ehdr.get_e_shentsize(),
- This::shdr_size);
- gold_exit(false);
+ symtab->add_warning(name + warn_prefix_len, this, shndx);
+ return true;
}
+ return false;
}
+// Class Sized_relobj.
+
template<int size, bool big_endian>
-Sized_object<size, big_endian>::~Sized_object()
+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),
+ symbols_(NULL),
+ local_symbol_offset_(0),
+ local_values_(),
+ local_got_offsets_()
{
}
-// Read the section header for section SHNUM.
-
template<int size, bool big_endian>
-const unsigned char*
-Sized_object<size, big_endian>::section_header(unsigned int shnum)
+Sized_relobj<size, big_endian>::~Sized_relobj()
{
- off_t symtabshdroff = this->shoff_ + shnum * This::shdr_size;
- return this->get_view(symtabshdroff, This::shdr_size);
}
-// Set up an object file bsaed on the file header. This sets up the
+// 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_object<size, big_endian>::setup(
+Sized_relobj<size, big_endian>::setup(
const elfcpp::Ehdr<size, big_endian>& ehdr)
{
- int machine = ehdr.get_e_machine();
- Target* target = select_target(machine, size, big_endian,
- ehdr.get_e_ident()[elfcpp::EI_OSABI],
- ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
- if (target == NULL)
- {
- fprintf(stderr, _("%s: %s: unsupported ELF machine number %d\n"),
- program_name, this->name().c_str(), machine);
- gold_exit(false);
- }
- this->set_target(target);
- unsigned int shnum = ehdr.get_e_shnum();
- unsigned int shstrndx = ehdr.get_e_shstrndx();
- if ((shnum == 0 || shstrndx == elfcpp::SHN_XINDEX)
- && this->shoff_ != 0)
- {
- typename This::Shdr shdr(this->section_header(0));
- if (shnum == 0)
- shnum = shdr.get_sh_size();
- if (shstrndx == elfcpp::SHN_XINDEX)
- shstrndx = shdr.get_sh_link();
- }
+ 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);
- this->shstrndx_ = shstrndx;
+}
- if (shnum == 0)
- return;
+// 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.
- // Find the SHT_SYMTAB section.
- const unsigned char* p = this->get_view (this->shoff_,
- shnum * This::shdr_size);
- // Skip the first section, which is always empty.
- p += This::shdr_size;
- for (unsigned int i = 1; i < shnum; ++i)
+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)
{
- typename This::Shdr shdr(p);
- if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
+ // 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)
{
- this->symtab_shnum_ = i;
- break;
+ --i;
+ p -= This::shdr_size;
+ typename This::Shdr shdr(p);
+ if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
+ {
+ this->symtab_shndx_ = i;
+ break;
+ }
}
- p += This::shdr_size;
}
}
-// Read the symbols and relocations from an object file.
+// Read the sections and symbols from an object file.
template<int size, bool big_endian>
-Read_symbols_data
-Sized_object<size, big_endian>::do_read_symbols()
+void
+Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
{
- if (this->symtab_shnum_ == 0)
+ this->read_section_data(&this->elf_file_, sd);
+
+ const unsigned char* const pshdrs = sd->section_headers->data();
+
+ this->find_symtab(pshdrs);
+
+ sd->symbols = NULL;
+ sd->symbols_size = 0;
+ sd->symbol_names = NULL;
+ sd->symbol_names_size = 0;
+
+ if (this->symtab_shndx_ == 0)
{
// No symbol table. Weird but legal.
- Read_symbols_data ret;
- ret.symbols = NULL;
- ret.symbols_size = 0;
- ret.symbol_names = NULL;
- ret.symbol_names_size = 0;
- return ret;
+ return;
}
- // Read the symbol table section header.
- typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_));
- assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+ // 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);
// We only need the external symbols.
const int sym_size = This::sym_size;
- off_t locsize = symtabshdr.get_sh_info() * sym_size;
+ const unsigned int loccount = symtabshdr.get_sh_info();
+ this->local_symbol_count_ = loccount;
+ off_t locsize = loccount * sym_size;
off_t extoff = symtabshdr.get_sh_offset() + locsize;
off_t extsize = symtabshdr.get_sh_size() - locsize;
// Read the symbol table.
- File_view* fvsymtab = this->get_lasting_view(extoff, extsize);
+ File_view* fvsymtab = this->get_lasting_view(extoff, extsize, false);
// Read the section header for the symbol names.
- unsigned int strtab_shnum = symtabshdr.get_sh_link();
- if (strtab_shnum == 0 || strtab_shnum >= this->shnum())
+ unsigned int strtab_shndx = symtabshdr.get_sh_link();
+ if (strtab_shndx >= this->shnum())
{
- fprintf(stderr, _("%s: %s: invalid symbol table name index: %u\n"),
- program_name, this->name().c_str(), strtab_shnum);
- gold_exit(false);
+ this->error(_("invalid symbol table name index: %u"), strtab_shndx);
+ return;
}
- typename This::Shdr strtabshdr(this->section_header(strtab_shnum));
+ typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size);
if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB)
{
- fprintf(stderr,
- _("%s: %s: symbol table name section has wrong type: %u\n"),
- program_name, this->name().c_str(),
- static_cast<unsigned int>(strtabshdr.get_sh_type()));
- gold_exit(false);
+ 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());
-
- Read_symbols_data ret;
- ret.symbols = fvsymtab;
- ret.symbols_size = extsize;
- ret.symbol_names = fvstrtab;
- ret.symbol_names_size = strtabshdr.get_sh_size();
-
- return ret;
-}
-
-// Add the symbols to the symbol table.
-
-template<int size, bool big_endian>
-void
-Sized_object<size, big_endian>::do_add_symbols(Symbol_table* symtab,
- Read_symbols_data sd)
-{
- if (sd.symbols == NULL)
- {
- assert(sd.symbol_names == NULL);
- return;
- }
-
- const int sym_size = This::sym_size;
- size_t symcount = sd.symbols_size / sym_size;
- if (symcount * sym_size != sd.symbols_size)
- {
- fprintf(stderr,
- _("%s: %s: size of symbols is not multiple of symbol size\n"),
- program_name, this->name().c_str());
- gold_exit(false);
- }
-
- this->symbols_ = new Symbol*[symcount];
-
- const elfcpp::Sym<size, big_endian>* syms =
- reinterpret_cast<const elfcpp::Sym<size, big_endian>*>(sd.symbols->data());
- const char* sym_names =
- reinterpret_cast<const char*>(sd.symbol_names->data());
- symtab->add_from_object(this, syms, symcount, sym_names,
- sd.symbol_names_size, this->symbols_);
+ strtabshdr.get_sh_size(), true);
- delete sd.symbols;
- delete sd.symbol_names;
+ sd->symbols = fvsymtab;
+ sd->symbols_size = extsize;
+ sd->symbol_names = fvstrtab;
+ sd->symbol_names_size = strtabshdr.get_sh_size();
}
// Return whether to include a section group in the link. LAYOUT is
template<int size, bool big_endian>
bool
-Sized_object<size, big_endian>::include_section_group(
+Sized_relobj<size, big_endian>::include_section_group(
Layout* layout,
unsigned int index,
const elfcpp::Shdr<size, big_endian>& shdr,
{
// Read the section contents.
const unsigned char* pcon = this->get_view(shdr.get_sh_offset(),
- shdr.get_sh_size());
+ 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::read_elf_word<big_endian>(pword);
+ elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword);
if ((flags & elfcpp::GRP_COMDAT) == 0)
return true;
// Get the appropriate symbol table header (this will normally be
// the single SHT_SYMTAB section, but in principle it need not be).
- if (shdr.get_sh_link() >= this->shnum())
- {
- fprintf(stderr, _("%s: %s: section group %u link %u out of range\n"),
- program_name, this->name().c_str(), index, shdr.get_sh_link());
- gold_exit(false);
- }
-
- typename This::Shdr symshdr(this->section_header(shdr.get_sh_link()));
+ 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)
{
- fprintf(stderr, _("%s: %s: section group %u info %u out of range\n"),
- program_name, this->name().c_str(), index, shdr.get_sh_info());
- gold_exit(false);
+ 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);
+ const unsigned char* psym = this->get_view(symoff, This::sym_size, true);
elfcpp::Sym<size, big_endian> sym(psym);
- // Read the section header for the symbol table names.
- if (symshdr.get_sh_link() >= this->shnum())
- {
- fprintf(stderr, _("%s; %s: symtab section %u link %u out of range\n"),
- program_name, this->name().c_str(), shdr.get_sh_link(),
- symshdr.get_sh_link());
- gold_exit(false);
- }
-
- typename This::Shdr symnamehdr(this->section_header(symshdr.get_sh_link()));
-
// Read the symbol table names.
- const unsigned char *psymnamesu = this->get_view(symnamehdr.get_sh_offset(),
- symnamehdr.get_sh_size());
+ off_t 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() >= symnamehdr.get_sh_size())
+ if (sym.get_st_name() >= symnamelen)
{
- fprintf(stderr, _("%s: %s: symbol %u name offset %u out of range\n"),
- program_name, this->name().c_str(), shdr.get_sh_info(),
- sym.get_st_name());
- gold_exit(false);
+ 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))
size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word);
for (size_t i = 1; i < count; ++i)
{
- elfcpp::Elf_Word secnum = elfcpp::read_elf_word<big_endian>(pword + i);
+ elfcpp::Elf_Word secnum =
+ elfcpp::Swap<32, big_endian>::readval(pword + i);
if (secnum >= this->shnum())
{
- fprintf(stderr,
- _("%s: %s: section %u in section group %u out of range"),
- program_name, this->name().c_str(), secnum,
- index);
- gold_exit(false);
+ this->error(_("section %u in section group %u out of range"),
+ secnum, index);
+ continue;
}
(*omit)[secnum] = true;
}
template<int size, bool big_endian>
bool
-Sized_object<size, big_endian>::include_linkonce_section(
+Sized_relobj<size, big_endian>::include_linkonce_section(
Layout* layout,
const char* name,
const elfcpp::Shdr<size, big_endian>&)
{
- const char* symname = strrchr(name, '.') + 1;
- bool omit1 = layout->add_comdat(symname, false);
- bool omit2 = layout->add_comdat(name, true);
- return omit1 || omit2;
+ // 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
template<int size, bool big_endian>
void
-Sized_object<size, big_endian>::do_layout(Layout* layout)
+Sized_relobj<size, big_endian>::do_layout(Symbol_table* symtab,
+ Layout* layout,
+ Read_symbols_data* sd)
{
- // This is always called from the main thread. Lock the file to
- // keep the error checks happy.
- Task_locker_obj<File_read> frl(this->input_file()->file());
+ const unsigned int shnum = this->shnum();
+ if (shnum == 0)
+ return;
// Get the section headers.
- unsigned int shnum = this->shnum();
- const unsigned char* pshdrs = this->get_view(this->shoff_,
- shnum * This::shdr_size);
+ const unsigned char* pshdrs = sd->section_headers->data();
// Get the section names.
- const unsigned char* pshdrnames = pshdrs + this->shstrndx_ * This::shdr_size;
- typename This::Shdr shdrnames(pshdrnames);
- typename elfcpp::Elf_types<size>::Elf_WXword names_size =
- shdrnames.get_sh_size();
- const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(),
- shdrnames.get_sh_size());
+ const unsigned char* pnamesu = sd->section_names->data();
const char* pnames = reinterpret_cast<const char*>(pnamesu);
std::vector<Map_to_output>& map_sections(this->map_to_output());
- map_sections.reserve(shnum);
+ 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);
- for (unsigned int i = 0; i < shnum; ++i)
+ // 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);
- if (shdr.get_sh_name() >= names_size)
+ if (shdr.get_sh_name() >= sd->section_names_size)
{
- fprintf(stderr,
- _("%s: %s: bad section name offset for section %u: %lu\n"),
- program_name, this->name().c_str(), i,
- static_cast<unsigned long>(shdr.get_sh_name()));
- gold_exit(false);
+ 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 (!this->include_section_group(layout, i, shdr, &omit))
discard = true;
}
- else if (Layout::is_linkonce(name))
+ else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0
+ && Layout::is_linkonce(name))
{
if (!this->include_linkonce_section(layout, name, shdr))
discard = true;
}
off_t offset;
- Output_section* os = layout->layout(this, name, shdr, &offset);
+ Output_section* os = layout->layout(this, i, name, shdr, &offset);
map_sections[i].output_section = os;
map_sections[i].offset = offset;
+ }
+
+ layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags);
+
+ 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;
+ }
- pshdrs += This::shdr_size;
+ const int sym_size = This::sym_size;
+ size_t symcount = sd->symbols_size / sym_size;
+ if (static_cast<off_t>(symcount * sym_size) != sd->symbols_size)
+ {
+ this->error(_("size of symbols is not multiple of symbol size"));
+ return;
}
+
+ this->symbols_ = new Symbol*[symcount];
+
+ 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 and we add their names to *POOL.
-// 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.
+// which they should be output, we add their names to *POOL, and we
+// add their values to THIS->LOCAL_VALUES_. Return the symbol index.
+// 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_object<size, big_endian>::do_finalize_local_symbols(off_t off,
+unsigned int
+Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index,
+ off_t off,
Stringpool* pool)
{
+ gold_assert(this->symtab_shndx_ != -1U);
+ if (this->symtab_shndx_ == 0)
+ {
+ // This object has no symbols. Weird but legal.
+ return index;
+ }
+
+ gold_assert(off == static_cast<off_t>(align_address(off, size >> 3)));
+
this->local_symbol_offset_ = off;
// Read the symbol table section header.
- typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_));
- assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+ 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.
- unsigned int loccount = symtabshdr.get_sh_info();
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);
+ locsize, true);
- // Read the section header for the symbol names.
- typename This::Shdr strtabshdr(
- this->section_header(symtabshdr.get_sh_link()));
- assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB);
+ this->local_values_.resize(loccount);
// Read the symbol names.
- const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(),
- strtabshdr.get_sh_size());
+ const unsigned int strtab_shndx = symtabshdr.get_sh_link();
+ off_t 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.
- std::vector<Map_to_output>& mo(this->map_to_output());
+ const 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)
+ 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();
if (shndx >= elfcpp::SHN_LORESERVE)
{
- if (shndx != elfcpp::SHN_ABS)
+ if (shndx == elfcpp::SHN_ABS)
+ lv.set_output_value(sym.get_st_value());
+ else
{
- fprintf(stderr,
- _("%s: %s: unknown section index %u "
- "for local symbol %u\n"),
- program_name, this->name().c_str(), shndx, i);
- gold_exit(false);
+ // FIXME: Handle SHN_XINDEX.
+ this->error(_("unknown section index %u for local symbol %u"),
+ shndx, i);
+ lv.set_output_value(0);
}
- // FIXME: Handle SHN_XINDEX.
}
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);
+ this->error(_("local symbol %u section index %u out of range"),
+ i, shndx);
+ shndx = 0;
}
- if (mo[shndx].output_section == NULL)
+ Output_section* os = mo[shndx].output_section;
+
+ if (os == NULL)
+ {
+ lv.set_output_value(0);
+ lv.set_no_output_symtab_entry();
+ continue;
+ }
+
+ if (mo[shndx].offset == -1)
+ lv.set_input_value(sym.get_st_value());
+ else
+ lv.set_output_value(mo[shndx].output_section->address()
+ + mo[shndx].offset
+ + sym.get_st_value());
+ }
+
+ // Decide whether this symbol should go into the output file.
+
+ 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;
+ }
+
+ const char* name = pnames + sym.get_st_name();
+ pool->add(name, true, NULL);
+ lv.set_output_symtab_index(index);
+ ++index;
+ ++count;
+ }
+
+ this->output_local_symbol_count_ = count;
+
+ return index;
+}
+
+// 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);
+}
+
+// Return the value of a local symbol defined in input section SHNDX,
+// with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL
+// indicates whether the symbol is a section symbol. This handles
+// SHF_MERGE sections.
+template<int size, bool big_endian>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Sized_relobj<size, big_endian>::local_value(unsigned int shndx,
+ Address value,
+ bool is_section_symbol,
+ Address addend) const
+{
+ const std::vector<Map_to_output>& mo(this->map_to_output());
+ Output_section* os = mo[shndx].output_section;
+ if (os == NULL)
+ return addend;
+ gold_assert(mo[shndx].offset == -1);
+
+ // Do the mapping required by the output section. If this is not a
+ // section symbol, then we want to map the symbol value, and then
+ // include the addend. If this is a section symbol, then we need to
+ // include the addend to figure out where in the section we are,
+ // before we do the mapping. This will do the right thing provided
+ // the assembler is careful to only convert a relocation in a merged
+ // section to a section symbol if there is a zero addend. If the
+ // assembler does not do this, then in general we can't know what to
+ // do, because we can't distinguish the addend for the instruction
+ // format from the addend for the section offset.
+
+ if (is_section_symbol)
+ return os->output_address(this, shndx, value + addend);
+ else
+ return addend + os->output_address(this, shndx, value);
+}
+
+// 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)
+{
+ if (parameters->strip_all())
+ 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();
+ off_t strtab_size;
+ const unsigned char* pnamesu = this->section_contents(strtab_shndx,
+ &strtab_size,
+ true);
+ 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);
+
+ const std::vector<Map_to_output>& mo(this->map_to_output());
+
+ gold_assert(this->local_values_.size() == loccount);
+
+ unsigned char* ov = oview;
+ psyms += sym_size;
+ for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
+ {
+ elfcpp::Sym<size, big_endian> isym(psyms);
+
+ if (!this->local_values_[i].needs_output_symtab_entry())
+ continue;
+
+ 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();
}
- pool->add(pnames + sym.get_st_name());
- off += sym_size;
+ elfcpp::Sym_write<size, big_endian> osym(ov);
- psyms += sym_size;
+ 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;
}
- return off;
+ gold_assert(ov - oview == output_size);
+
+ of->write_output_view(this->local_symbol_offset_, output_size, oview);
}
// Input_objects methods.
-void
+// Add a regular relocatable object to the list. Return false if this
+// object should be ignored.
+
+bool
Input_objects::add_object(Object* obj)
{
- this->object_list_.push_back(obj);
+ 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);
+
+ std::pair<Unordered_set<std::string>::iterator, bool> ins =
+ this->sonames_.insert(dynobj->soname());
+ if (!ins.second)
+ {
+ // We have already seen a dynamic object with this soname.
+ return false;
+ }
+
+ this->dynobj_list_.push_back(dynobj);
+ }
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);
+ gold_error(_("%s: incompatible target"), obj->name().c_str());
+ return false;
}
- if (obj->is_dynamic())
- this->any_dynamic_ = true;
+ set_parameters_size_and_endianness(target->get_size(),
+ target->is_big_endian());
+
+ return true;
+}
+
+// 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.
off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
{
int et = ehdr.get_e_type();
- if (et != elfcpp::ET_REL && et != elfcpp::ET_DYN)
+ if (et == elfcpp::ET_REL)
{
- fprintf(stderr, "%s: %s: unsupported ELF type %d\n",
- program_name, name.c_str(), static_cast<int>(et));
- gold_exit(false);
+ Sized_relobj<size, big_endian>* obj =
+ new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr);
+ obj->setup(ehdr);
+ return obj;
}
-
- if (et == elfcpp::ET_REL)
+ else if (et == elfcpp::ET_DYN)
{
- Sized_object<size, big_endian>* obj =
- new Sized_object<size, big_endian>(name, input_file, offset, ehdr);
+ Sized_dynobj<size, big_endian>* obj =
+ new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
obj->setup(ehdr);
return obj;
}
else
{
- // elfcpp::ET_DYN
- fprintf(stderr, _("%s: %s: dynamic objects are not yet supported\n"),
- program_name, name.c_str());
- gold_exit(false);
-// Sized_dynobj<size, big_endian>* obj =
-// new Sized_dynobj<size, big_endian>(this->input_.name(), input_file,
-// offset, ehdr);
-// obj->setup(ehdr);
-// return obj;
+ gold_error(_("%s: unsupported ELF file type %d"),
+ name.c_str(), et);
+ return NULL;
}
}
{
if (bytes < elfcpp::EI_NIDENT)
{
- fprintf(stderr, _("%s: %s: ELF file too short\n"),
- program_name, name.c_str());
- gold_exit(false);
+ 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)
- fprintf(stderr, _("%s: %s: invalid ELF version 0\n"),
- program_name, name.c_str());
+ gold_error(_("%s: invalid ELF version 0"), name.c_str());
else
- fprintf(stderr, _("%s: %s: unsupported ELF version %d\n"),
- program_name, name.c_str(), v);
- gold_exit(false);
+ gold_error(_("%s: unsupported ELF version %d"), name.c_str(), v);
+ return NULL;
}
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);
+ gold_error(_("%s: invalid ELF class 0"), name.c_str());
+ return NULL;
}
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);
+ gold_error(_("%s: unsupported ELF class %d"), name.c_str(), c);
+ return NULL;
}
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);
+ gold_error(_("%s: invalid ELF data encoding"), name.c_str());
+ return NULL;
}
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);
+ gold_error(_("%s: unsupported ELF data encoding %d"), name.c_str(), d);
+ return NULL;
}
bool big_endian = d == elfcpp::ELFDATA2MSB;
{
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);
+ 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)
{
- fprintf(stderr, _("%s: %s: ELF file too short\n"),
- program_name, name.c_str());
- gold_exit(false);
+ 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
-class Sized_object<32, false>;
+struct Relocate_info<32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
-class Sized_object<32, true>;
+struct Relocate_info<32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
-class Sized_object<64, false>;
+struct Relocate_info<64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
-class Sized_object<64, true>;
+struct Relocate_info<64, true>;
+#endif
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff