// object.cc -- support for an object file for linking in gold
+// Copyright 2006, 2007, 2008 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 "demangle.h"
+#include "libiberty.h"
-#include "object.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.
-// Class Sized_object.
+// Set the target based on fields in the ELF file header.
-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),
- section_headers_(NULL),
- flags_(ehdr.get_e_flags()),
- shoff_(ehdr.get_e_shoff()),
- shstrndx_(0),
- symtab_shnum_(0),
- local_symbol_count_(0),
- output_local_symbol_count_(0),
- symbols_(NULL),
- local_symbol_offset_(0),
- values_(NULL)
+void
+Object::set_target(int machine, int size, bool big_endian, int osabi,
+ int abiversion)
{
- 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)
- {
- 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);
- }
+ 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;
}
-template<int size, bool big_endian>
-Sized_object<size, big_endian>::~Sized_object()
+// 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);
}
-// Read the section header for section SHNUM.
+// Return a view of the contents of a section.
-template<int size, bool big_endian>
-inline const unsigned char*
-Sized_object<size, big_endian>::section_header(unsigned int shnum)
+const unsigned char*
+Object::section_contents(unsigned int shndx, section_size_type* plen,
+ bool cache)
{
- assert(shnum < this->shnum());
- off_t symtabshdroff = this->shoff_ + shnum * This::shdr_size;
- return this->get_view(symtabshdroff, This::shdr_size);
+ 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);
}
-// Return the name of section SHNUM.
+// 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>
-std::string
-Sized_object<size, big_endian>::do_section_name(unsigned int shnum)
+void
+Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file,
+ Read_symbols_data* sd)
{
- Task_lock_obj<Object> tl(*this);
+ 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.
- typename This::Shdr shdrnames(this->section_header(this->shstrndx_));
- const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(),
- shdrnames.get_sh_size());
- const char* pnames = reinterpret_cast<const char*>(pnamesu);
+ 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()));
- typename This::Shdr shdr(this->section_header(shnum));
- if (shdr.get_sh_name() >= shdrnames.get_sh_size())
+ 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)
{
- fprintf(stderr,
- _("%s: %s: bad section name offset for section %u: %lu\n"),
- program_name, this->name().c_str(), shnum,
- static_cast<unsigned long>(shdr.get_sh_name()));
- gold_exit(false);
+ // 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;
+}
- return std::string(pnames + shdr.get_sh_name());
+// 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 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);
+ this->set_target(ehdr.get_e_machine(), size, big_endian,
+ ehdr.get_e_ident()[elfcpp::EI_OSABI],
+ ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
- unsigned int shnum = ehdr.get_e_shnum();
- unsigned int shstrndx = ehdr.get_e_shstrndx();
- if ((shnum == 0 || shstrndx == elfcpp::SHN_XINDEX)
- && this->shoff_ != 0)
+ 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)
{
- 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();
+ // 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;
+ }
+ }
}
- this->set_shnum(shnum);
- this->shstrndx_ = shstrndx;
+}
- if (shnum == 0)
- return;
+// Return whether SHDR has the right type and flags to be a GNU
+// .eh_frame section.
- // We store the section headers in a File_view until do_read_symbols.
- this->section_headers_ = this->get_lasting_view(this->shoff_,
- shnum * This::shdr_size);
+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) != 0);
+}
- // Find the SHT_SYMTAB section. 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.
- const unsigned char* p = this->section_headers_->data();
+// Return whether there is a GNU .eh_frame section, given the section
+// headers and the section names.
- // Skip the first section, which is always empty.
- p += This::shdr_size;
+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 (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
+ if (this->check_eh_frame_flags(&shdr))
{
- this->symtab_shnum_ = i;
- break;
+ 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_object<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
+Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
{
- // Transfer our view of the section headers to SD.
- sd->section_headers = this->section_headers_;
- this->section_headers_ = NULL;
+ this->read_section_data(&this->elf_file_, sd);
- // Read the section names.
- const unsigned char* pshdrs = sd->section_headers->data();
- const unsigned char* pshdrnames = pshdrs + this->shstrndx_ * This::shdr_size;
- typename This::Shdr shdrnames(pshdrnames);
- sd->section_names_size = shdrnames.get_sh_size();
- sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(),
- sd->section_names_size);
+ const unsigned char* const pshdrs = sd->section_headers->data();
+
+ this->find_symtab(pshdrs);
- if (this->symtab_shnum_ == 0)
+ const unsigned char* namesu = sd->section_names->data();
+ const char* names = reinterpret_cast<const char*>(namesu);
+ if (memmem(names, sd->section_names_size, ".eh_frame", 10) != NULL)
+ {
+ 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.
- sd->symbols = NULL;
- sd->symbols_size = 0;
- sd->symbol_names = NULL;
- sd->symbol_names_size = 0;
return;
}
// Get the symbol table section header.
typename This::Shdr symtabshdr(pshdrs
- + this->symtab_shnum_ * This::shdr_size);
- assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+ + 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.
- // We only need the external symbols.
const int sym_size = This::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;
+ 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;
- // Read the symbol table.
- File_view* fvsymtab = this->get_lasting_view(extoff, extsize);
+ 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 shnum = this->shnum();
- unsigned int strtab_shnum = symtabshdr.get_sh_link();
- if (strtab_shnum == 0 || strtab_shnum >= 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(pshdrs + strtab_shnum * This::shdr_size);
+ 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());
+ strtabshdr.get_sh_size(), true);
sd->symbols = fvsymtab;
- sd->symbols_size = extsize;
+ sd->symbols_size = readsize;
+ sd->external_symbols_offset = this->has_eh_frame_ ? locsize : 0;
sd->symbol_names = fvstrtab;
- sd->symbol_names_size = strtabshdr.get_sh_size();
+ 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
template<int size, bool big_endian>
bool
-Sized_object<size, big_endian>::include_section_group(
+Sized_relobj<size, big_endian>::include_section_group(
+ Symbol_table* symtab,
Layout* layout,
unsigned int index,
+ const char* name,
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());
+ 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);
- if ((flags & elfcpp::GRP_COMDAT) == 0)
- return true;
+ elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword);
// 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?
+ // just have the group signature point into the string table, rather
+ // than indirect through a symbol?
// 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, false);
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());
+ 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() >= 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();
// 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.
- if (signature[0] == '\0'
- && sym.get_st_type() == elfcpp::STT_SECTION
- && sym.get_st_shndx() < this->shnum())
- {
- typename This::Shdr shdrnames(this->section_header(this->shstrndx_));
- const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(),
- shdrnames.get_sh_size());
- const char* pnames = reinterpret_cast<const char*>(pnamesu);
-
- typename This::Shdr sechdr(this->section_header(sym.get_st_shndx()));
- if (sechdr.get_sh_name() >= shdrnames.get_sh_size())
- {
- fprintf(stderr,
- _("%s: %s: bad section name offset for section %u: %lu\n"),
- program_name, this->name().c_str(), sym.get_st_shndx(),
- static_cast<unsigned long>(sechdr.get_sh_name()));
- gold_exit(false);
- }
-
- signature = pnames + sechdr.get_sh_name();
+ 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;
+
+ if ((flags & elfcpp::GRP_COMDAT) == 0
+ || layout->add_comdat(signature, true))
+ {
+ if (parameters->options().relocatable())
+ layout->layout_group(symtab, this, index, name, signature, shdr,
+ pword);
+ 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::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;
+ // 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;
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)
{
- unsigned int shnum = this->shnum();
+ const unsigned int shnum = this->shnum();
if (shnum == 0)
return;
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);
+ // If we are only linking for symbols, then there is nothing else to
+ // do here.
+ if (this->input_file()->just_symbols())
+ {
+ delete sd->section_headers;
+ sd->section_headers = NULL;
+ delete sd->section_names;
+ sd->section_names = NULL;
+ return;
+ }
+
+ // 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, pshdrs += This::shdr_size)
+ // Keep track of reloc sections when emitting relocations.
+ const bool relocatable = parameters->options().relocatable();
+ const bool emit_relocs = (relocatable
+ || parameters->options().emit_relocs());
+ std::vector<unsigned int> reloc_sections;
+
+ // 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)
{
- 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 (!relocatable)
+ 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))
+ if (!this->include_section_group(symtab, layout, i, name, 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;
continue;
}
+ // When doing a relocatable link we are going to copy input
+ // reloc sections into the output. We only want to copy the
+ // ones associated with sections which are not being discarded.
+ // However, we don't know that yet for all sections. So save
+ // reloc sections and process them later.
+ if (emit_relocs
+ && (shdr.get_sh_type() == elfcpp::SHT_REL
+ || shdr.get_sh_type() == elfcpp::SHT_RELA))
+ {
+ reloc_sections.push_back(i);
+ continue;
+ }
+
+ if (relocatable && shdr.get_sh_type() == elfcpp::SHT_GROUP)
+ 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 (!relocatable
+ && 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, &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);
+
+ // When doing a relocatable link handle the reloc sections at the
+ // end.
+ if (emit_relocs)
+ this->size_relocatable_relocs();
+ for (std::vector<unsigned int>::const_iterator p = reloc_sections.begin();
+ p != reloc_sections.end();
+ ++p)
+ {
+ unsigned int i = *p;
+ const unsigned char* pshdr;
+ pshdr = sd->section_headers->data() + i * This::shdr_size;
+ typename This::Shdr shdr(pshdr);
+
+ unsigned int data_shndx = shdr.get_sh_info();
+ if (data_shndx >= shnum)
+ {
+ // We already warned about this above.
+ continue;
+ }
+
+ Output_section* data_section = map_sections[data_shndx].output_section;
+ if (data_section == NULL)
+ {
+ map_sections[i].output_section = NULL;
+ continue;
+ }
+
+ Relocatable_relocs* rr = new Relocatable_relocs();
+ this->set_relocatable_relocs(i, rr);
+
+ Output_section* os = layout->layout_reloc(this, i, shdr, data_section,
+ rr);
+ map_sections[i].output_section = os;
+ map_sections[i].offset = -1;
+ }
+
+ // 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;
template<int size, bool big_endian>
void
-Sized_object<size, big_endian>::do_add_symbols(Symbol_table* symtab,
+Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
Read_symbols_data* sd)
{
if (sd->symbols == NULL)
{
- assert(sd->symbol_names == NULL);
+ gold_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)
+ size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
+ / sym_size);
+ if (symcount * sym_size != sd->symbols_size - sd->external_symbols_offset)
{
- fprintf(stderr,
- _("%s: %s: size of symbols is not multiple of symbol size\n"),
- program_name, this->name().c_str());
- gold_exit(false);
+ this->error(_("size of symbols is not multiple of symbol size"));
+ return;
}
- this->symbols_ = new Symbol*[symcount];
+ this->symbols_.resize(symcount);
- const unsigned char* psyms = sd->symbols->data();
- const elfcpp::Sym<size, big_endian>* syms =
- reinterpret_cast<const elfcpp::Sym<size, big_endian>*>(psyms);
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_);
+ 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;
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.
+// 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>
-off_t
-Sized_object<size, big_endian>::do_finalize_local_symbols(off_t off,
- Stringpool* pool)
+void
+Sized_relobj<size, big_endian>::do_count_local_symbols(Stringpool* pool,
+ Stringpool* dynpool)
{
- if (this->symtab_shnum_ == 0)
+ gold_assert(this->symtab_shndx_ != -1U);
+ if (this->symtab_shndx_ == 0)
{
// This object has no symbols. Weird but legal.
- return off;
+ return;
}
- off = 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.
const int sym_size = This::sym_size;
const unsigned int loccount = this->local_symbol_count_;
- assert(loccount == symtabshdr.get_sh_info());
+ 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);
-
- this->values_ = new typename elfcpp::Elf_types<size>::Elf_Addr[loccount];
-
- // 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);
+ locsize, true);
// 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();
+ 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.
- 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;
+ 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();
+ gold_assert(!lv.needs_output_dynsym_entry());
+ continue;
+ }
+
+ if (sym.get_st_type() == elfcpp::STT_SECTION)
+ {
+ lv.set_no_output_symtab_entry();
+ gold_assert(!lv.needs_output_dynsym_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)
- this->values_[i] = sym.get_st_value();
+ if (shndx == elfcpp::SHN_ABS || shndx == elfcpp::SHN_COMMON)
+ lv.set_output_value(lv.input_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);
+ this->error(_("unknown section index %u for local symbol %u"),
+ shndx, i);
+ lv.set_output_value(0);
}
}
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)
{
- this->values_[i] = 0;
+ lv.set_output_value(0);
continue;
}
-
- this->values_[i] = (mo[shndx].output_section->address()
- + mo[shndx].offset
- + sym.get_st_value());
+ 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());
}
- pool->add(pnames + sym.get_st_name());
- off += sym_size;
- ++count;
+ if (lv.needs_output_symtab_entry())
+ {
+ lv.set_output_symtab_index(index);
+ ++index;
+ }
}
+ return index;
+}
- this->output_local_symbol_count_ = count;
+// Set the output dynamic symbol table indexes for the local variables.
- return off;
+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_;
}
// Write out the local symbols.
template<int size, bool big_endian>
void
-Sized_object<size, big_endian>::write_local_symbols(Output_file* of,
- const Stringpool* sympool)
+Sized_relobj<size, big_endian>::write_local_symbols(
+ Output_file* of,
+ const Stringpool* sympool,
+ const Stringpool* dynpool)
{
- if (this->symtab_shnum_ == 0)
+ if (parameters->options().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.
- 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);
const unsigned int loccount = this->local_symbol_count_;
- assert(loccount == symtabshdr.get_sh_info());
+ 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);
-
- // 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);
+ locsize, false);
// 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();
+ 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 a view into the output file.
+ // 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 = of->get_output_view(this->local_symbol_offset_,
- output_size);
+ unsigned char* oview = NULL;
+ if (output_size > 0)
+ oview = of->get_output_view(this->local_symbol_offset_, output_size);
- std::vector<Map_to_output>& mo(this->map_to_output());
+ 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);
- psyms += sym_size;
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);
- elfcpp::Sym_write<size, big_endian> osym(ov);
unsigned int st_shndx = isym.get_st_shndx();
if (st_shndx < elfcpp::SHN_LORESERVE)
{
- assert(st_shndx < mo.size());
+ gold_assert(st_shndx < mo.size());
if (mo[st_shndx].output_section == NULL)
continue;
st_shndx = mo[st_shndx].output_section->out_shndx();
}
- 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);
+ // Write the symbol to the output symbol table.
+ if (!parameters->options().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);
+ }
- ov += sym_size;
+ 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);
- assert(ov - oview == output_size);
+ 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->options().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;
+ }
+ }
- of->write_output_view(this->local_symbol_offset_, output_size, oview);
+ return false;
}
// 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);
-
+ // Set the global target from the first object file we recognize.
Target* target = obj->target();
- if (this->target_ == NULL)
- this->target_ = target;
- else if (this->target_ != target)
+ if (!parameters->target_valid())
+ set_parameters_target(target);
+ else if (target != ¶meters->target())
{
- fprintf(stderr, "%s: %s: incompatible target\n",
- program_name, obj->name().c_str());
- gold_exit(false);
+ obj->error(_("incompatible target"));
+ return false;
}
- if (obj->is_dynamic())
- this->any_dynamic_ = true;
+ 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);
+ }
+ }
+
+ 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.
template<int size, bool big_endian>
std::string
-Relocate_info<size, big_endian>::location(size_t relnum, off_t) const
+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 += ": 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) + ")";
+ 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;
}
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;
}
}
Object*
make_elf_object(const std::string& name, Input_file* input_file, off_t offset,
- const unsigned char* p, off_t bytes)
+ const unsigned char* p, section_offset_type bytes)
{
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_object<32, false>;
+class Sized_relobj<32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
-class Sized_object<32, true>;
+class Sized_relobj<32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
-class Sized_object<64, false>;
+class Sized_relobj<64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
-class Sized_object<64, true>;
+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.
projects / deliverable / binutils-gdb.git / blobdiff