// output.cc -- manage the output file for 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 <cstdlib>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
+#include <sys/stat.h>
#include <algorithm>
+#include "libiberty.h" // for unlink_if_ordinary()
+#include "parameters.h"
#include "object.h"
#include "symtab.h"
#include "reloc.h"
+#include "merge.h"
#include "output.h"
namespace gold
// Output_data variables.
-bool Output_data::sizes_are_fixed;
+bool Output_data::allocated_sizes_are_fixed;
// Output_data methods.
{
}
-// Set the address and offset.
+// Return the default alignment for the target size.
-void
-Output_data::set_address(uint64_t addr, off_t off)
+uint64_t
+Output_data::default_alignment()
{
- this->address_ = addr;
- this->offset_ = off;
-
- // Let the child class know.
- this->do_set_address(addr, off);
+ return Output_data::default_alignment_for_size(parameters->get_size());
}
// Return the default alignment for a size--32 or 64.
uint64_t
-Output_data::default_alignment(int size)
+Output_data::default_alignment_for_size(int size)
{
if (size == 32)
return 4;
// segment and section lists are complete at construction time.
Output_section_headers::Output_section_headers(
- int size,
- bool big_endian,
- const Layout::Segment_list& segment_list,
- const Layout::Section_list& unattached_section_list,
+ const Layout* layout,
+ const Layout::Segment_list* segment_list,
+ const Layout::Section_list* unattached_section_list,
const Stringpool* secnamepool)
- : size_(size),
- big_endian_(big_endian),
+ : layout_(layout),
segment_list_(segment_list),
unattached_section_list_(unattached_section_list),
secnamepool_(secnamepool)
{
// Count all the sections. Start with 1 for the null section.
off_t count = 1;
- for (Layout::Segment_list::const_iterator p = segment_list.begin();
- p != segment_list.end();
+ for (Layout::Segment_list::const_iterator p = segment_list->begin();
+ p != segment_list->end();
++p)
if ((*p)->type() == elfcpp::PT_LOAD)
count += (*p)->output_section_count();
- count += unattached_section_list.size();
+ count += unattached_section_list->size();
+ const int size = parameters->get_size();
int shdr_size;
if (size == 32)
shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
void
Output_section_headers::do_write(Output_file* of)
{
- if (this->size_ == 32)
+ if (parameters->get_size() == 32)
{
- if (this->big_endian_)
- this->do_sized_write<32, true>(of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ this->do_sized_write<32, true>(of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->do_sized_write<32, false>(of);
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ this->do_sized_write<32, false>(of);
+#else
+ gold_unreachable();
+#endif
+ }
}
- else if (this->size_ == 64)
+ else if (parameters->get_size() == 64)
{
- if (this->big_endian_)
- this->do_sized_write<64, true>(of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ this->do_sized_write<64, true>(of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->do_sized_write<64, false>(of);
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->do_sized_write<64, false>(of);
+#else
+ gold_unreachable();
+#endif
+ }
}
else
gold_unreachable();
v += shdr_size;
unsigned shndx = 1;
- for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
- p != this->segment_list_.end();
+ for (Layout::Segment_list::const_iterator p = this->segment_list_->begin();
+ p != this->segment_list_->end();
++p)
v = (*p)->write_section_headers SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
- this->secnamepool_, v, &shndx
+ this->layout_, this->secnamepool_, v, &shndx
SELECT_SIZE_ENDIAN(size, big_endian));
for (Layout::Section_list::const_iterator p =
- this->unattached_section_list_.begin();
- p != this->unattached_section_list_.end();
+ this->unattached_section_list_->begin();
+ p != this->unattached_section_list_->end();
++p)
{
gold_assert(shndx == (*p)->out_shndx());
elfcpp::Shdr_write<size, big_endian> oshdr(v);
- (*p)->write_header(this->secnamepool_, &oshdr);
+ (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
v += shdr_size;
++shndx;
}
// Output_segment_header methods.
Output_segment_headers::Output_segment_headers(
- int size,
- bool big_endian,
const Layout::Segment_list& segment_list)
- : size_(size), big_endian_(big_endian), segment_list_(segment_list)
+ : segment_list_(segment_list)
{
+ const int size = parameters->get_size();
int phdr_size;
if (size == 32)
phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
void
Output_segment_headers::do_write(Output_file* of)
{
- if (this->size_ == 32)
+ if (parameters->get_size() == 32)
{
- if (this->big_endian_)
- this->do_sized_write<32, true>(of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ this->do_sized_write<32, true>(of);
+#else
+ gold_unreachable();
+#endif
+ }
else
+ {
+#ifdef HAVE_TARGET_32_LITTLE
this->do_sized_write<32, false>(of);
+#else
+ gold_unreachable();
+#endif
+ }
}
- else if (this->size_ == 64)
+ else if (parameters->get_size() == 64)
{
- if (this->big_endian_)
- this->do_sized_write<64, true>(of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ this->do_sized_write<64, true>(of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->do_sized_write<64, false>(of);
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->do_sized_write<64, false>(of);
+#else
+ gold_unreachable();
+#endif
+ }
}
else
gold_unreachable();
// Output_file_header methods.
-Output_file_header::Output_file_header(int size,
- bool big_endian,
- const General_options& options,
- const Target* target,
+Output_file_header::Output_file_header(const Target* target,
const Symbol_table* symtab,
const Output_segment_headers* osh)
- : size_(size),
- big_endian_(big_endian),
- options_(options),
- target_(target),
+ : target_(target),
symtab_(symtab),
segment_header_(osh),
section_header_(NULL),
shstrtab_(NULL)
{
+ const int size = parameters->get_size();
int ehdr_size;
if (size == 32)
ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size;
void
Output_file_header::do_write(Output_file* of)
{
- if (this->size_ == 32)
+ gold_assert(this->offset() == 0);
+
+ if (parameters->get_size() == 32)
{
- if (this->big_endian_)
- this->do_sized_write<32, true>(of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ this->do_sized_write<32, true>(of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->do_sized_write<32, false>(of);
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ this->do_sized_write<32, false>(of);
+#else
+ gold_unreachable();
+#endif
+ }
}
- else if (this->size_ == 64)
+ else if (parameters->get_size() == 64)
{
- if (this->big_endian_)
- this->do_sized_write<64, true>(of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ this->do_sized_write<64, true>(of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->do_sized_write<64, false>(of);
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->do_sized_write<64, false>(of);
+#else
+ gold_unreachable();
+#endif
+ }
}
else
gold_unreachable();
oehdr.put_e_ident(e_ident);
elfcpp::ET e_type;
- // FIXME: ET_DYN.
- if (this->options_.is_relocatable())
+ if (parameters->output_is_object())
e_type = elfcpp::ET_REL;
+ else if (parameters->output_is_shared())
+ e_type = elfcpp::ET_DYN;
else
e_type = elfcpp::ET_EXEC;
oehdr.put_e_type(e_type);
// Output_section_data methods.
+// Record the output section, and set the entry size and such.
+
+void
+Output_section_data::set_output_section(Output_section* os)
+{
+ gold_assert(this->output_section_ == NULL);
+ this->output_section_ = os;
+ this->do_adjust_output_section(os);
+}
+
+// Return the section index of the output section.
+
unsigned int
Output_section_data::do_out_shndx() const
{
// Output_data_strtab methods.
-// Set the address. We don't actually care about the address, but we
-// do set our final size.
+// Set the final data size.
void
-Output_data_strtab::do_set_address(uint64_t, off_t)
+Output_data_strtab::set_final_data_size()
{
this->strtab_->set_string_offsets();
this->set_data_size(this->strtab_->get_strtab_size());
gold_unreachable();
case GSYM_CODE:
- if (this->u_.gsym == NULL)
+ if (this->u1_.gsym == NULL)
index = 0;
else if (dynamic)
- index = this->u_.gsym->dynsym_index();
+ index = this->u1_.gsym->dynsym_index();
else
- index = this->u_.gsym->symtab_index();
+ index = this->u1_.gsym->symtab_index();
break;
case SECTION_CODE:
if (dynamic)
- index = this->u_.os->dynsym_index();
+ index = this->u1_.os->dynsym_index();
else
- index = this->u_.os->symtab_index();
+ index = this->u1_.os->symtab_index();
+ break;
+
+ case 0:
+ // Relocations without symbols use a symbol index of 0.
+ index = 0;
break;
default:
gold_unreachable();
}
else
- index = this->u_.object->symtab_index(this->local_sym_index_);
+ index = this->u1_.relobj->symtab_index(this->local_sym_index_);
break;
}
gold_assert(index != -1U);
Write_rel* wr) const
{
Address address = this->address_;
- if (this->od_ != NULL)
- address += this->od_->address();
+ if (this->shndx_ != INVALID_CODE)
+ {
+ off_t off;
+ Output_section* os = this->u2_.relobj->output_section(this->shndx_,
+ &off);
+ gold_assert(os != NULL);
+ if (off != -1)
+ address += os->address() + off;
+ else
+ {
+ address = os->output_address(this->u2_.relobj, this->shndx_,
+ address);
+ gold_assert(address != -1U);
+ }
+ }
+ else if (this->u2_.od != NULL)
+ address += this->u2_.od->address();
wr->put_r_offset(address);
wr->put_r_info(elfcpp::elf_r_info<size>(this->get_symbol_index(),
this->type_));
// Output_data_reloc_base methods.
+// Adjust the output section.
+
+template<int sh_type, bool dynamic, int size, bool big_endian>
+void
+Output_data_reloc_base<sh_type, dynamic, size, big_endian>
+ ::do_adjust_output_section(Output_section* os)
+{
+ if (sh_type == elfcpp::SHT_REL)
+ os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
+ else if (sh_type == elfcpp::SHT_RELA)
+ os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
+ else
+ gold_unreachable();
+ if (dynamic)
+ os->set_should_link_to_dynsym();
+ else
+ os->set_should_link_to_symtab();
+}
+
// Write out relocation data.
template<int sh_type, bool dynamic, int size, bool big_endian>
template<int size, bool big_endian>
void
-Output_data_got<size, big_endian>::Got_entry::write(
- const General_options* options,
- unsigned char* pov) const
+Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const
{
Valtype val = 0;
// If the symbol is resolved locally, we need to write out its
// value. Otherwise we just write zero. The target code is
// responsible for creating a relocation entry to fill in the
- // value at runtime.
- if (gsym->final_value_is_known(options))
+ // value at runtime. For non-preemptible symbols in a shared
+ // library, the target will need to record whether or not the
+ // value should be written (e.g., it may use a RELATIVE
+ // relocation type).
+ if (gsym->final_value_is_known() || gsym->needs_value_in_got())
{
Sized_symbol<size>* sgsym;
// This cast is a bit ugly. We don't want to put a
break;
default:
- gold_unreachable();
+ val = this->u_.object->local_symbol_value(this->local_sym_index_);
+ break;
}
elfcpp::Swap<size, big_endian>::writeval(pov, val);
return true;
}
+// Add an entry for a local symbol to the GOT. This returns true if
+// this is a new GOT entry, false if the symbol already has a GOT
+// entry.
+
+template<int size, bool big_endian>
+bool
+Output_data_got<size, big_endian>::add_local(
+ Sized_relobj<size, big_endian>* object,
+ unsigned int symndx)
+{
+ if (object->local_has_got_offset(symndx))
+ return false;
+
+ this->entries_.push_back(Got_entry(object, symndx));
+ this->set_got_size();
+ object->set_local_got_offset(symndx, this->last_got_offset());
+ return true;
+}
+
+// Add an entry (or a pair of entries) for a global TLS symbol to the GOT.
+// In a pair of entries, the first value in the pair will be used for the
+// module index, and the second value will be used for the dtv-relative
+// offset. This returns true if this is a new GOT entry, false if the symbol
+// already has a GOT entry.
+
+template<int size, bool big_endian>
+bool
+Output_data_got<size, big_endian>::add_global_tls(Symbol* gsym,
+ bool need_pair)
+{
+ if (gsym->has_tls_got_offset(need_pair))
+ return false;
+
+ this->entries_.push_back(Got_entry(gsym));
+ gsym->set_tls_got_offset(this->last_got_offset(), need_pair);
+ if (need_pair)
+ this->entries_.push_back(Got_entry(gsym));
+ this->set_got_size();
+ return true;
+}
+
+// Add an entry (or a pair of entries) for a local TLS symbol to the GOT.
+// In a pair of entries, the first value in the pair will be used for the
+// module index, and the second value will be used for the dtv-relative
+// offset. This returns true if this is a new GOT entry, false if the symbol
+// already has a GOT entry.
+
+template<int size, bool big_endian>
+bool
+Output_data_got<size, big_endian>::add_local_tls(
+ Sized_relobj<size, big_endian>* object,
+ unsigned int symndx,
+ bool need_pair)
+{
+ if (object->local_has_tls_got_offset(symndx, need_pair))
+ return false;
+
+ this->entries_.push_back(Got_entry(object, symndx));
+ object->set_local_tls_got_offset(symndx, this->last_got_offset(), need_pair);
+ if (need_pair)
+ this->entries_.push_back(Got_entry(object, symndx));
+ this->set_got_size();
+ return true;
+}
+
// Write out the GOT.
template<int size, bool big_endian>
p != this->entries_.end();
++p)
{
- p->write(this->options_, pov);
+ p->write(pov);
pov += add;
}
void
Output_data_dynamic::Dynamic_entry::write(
unsigned char* pov,
- const Stringpool* pool) const
+ const Stringpool* pool
+ ACCEPT_SIZE_ENDIAN) const
{
typename elfcpp::Elf_types<size>::Elf_WXword val;
switch (this->classification_)
break;
case DYNAMIC_SECTION_ADDRESS:
- val = this->u_.os->address();
+ val = this->u_.od->address();
break;
case DYNAMIC_SECTION_SIZE:
- val = this->u_.os->data_size();
+ val = this->u_.od->data_size();
break;
case DYNAMIC_SYMBOL:
{
- Sized_symbol<size>* s = static_cast<Sized_symbol<size>*>(this->u_.sym);
+ const Sized_symbol<size>* s =
+ static_cast<const Sized_symbol<size>*>(this->u_.sym);
val = s->value();
}
break;
// Output_data_dynamic methods.
+// Adjust the output section to set the entry size.
+
+void
+Output_data_dynamic::do_adjust_output_section(Output_section* os)
+{
+ if (parameters->get_size() == 32)
+ os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size);
+ else if (parameters->get_size() == 64)
+ os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size);
+ else
+ gold_unreachable();
+}
+
// Set the final data size.
void
-Output_data_dynamic::do_set_address(uint64_t, off_t)
+Output_data_dynamic::set_final_data_size()
{
// Add the terminating entry.
this->add_constant(elfcpp::DT_NULL, 0);
int dyn_size;
- if (this->target_->get_size() == 32)
+ if (parameters->get_size() == 32)
dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
- else if (this->target_->get_size() == 64)
+ else if (parameters->get_size() == 64)
dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
else
gold_unreachable();
void
Output_data_dynamic::do_write(Output_file* of)
{
- if (this->target_->get_size() == 32)
+ if (parameters->get_size() == 32)
{
- if (this->target_->is_big_endian())
- this->sized_write<32, true>(of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ this->sized_write<32, true>(of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->sized_write<32, false>(of);
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ this->sized_write<32, false>(of);
+#else
+ gold_unreachable();
+#endif
+ }
}
- else if (this->target_->get_size() == 64)
+ else if (parameters->get_size() == 64)
{
- if (this->target_->is_big_endian())
- this->sized_write<64, true>(of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ this->sized_write<64, true>(of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->sized_write<64, false>(of);
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->sized_write<64, false>(of);
+#else
+ gold_unreachable();
+#endif
+ }
}
else
gold_unreachable();
p != this->entries_.end();
++p)
{
- p->write<size, big_endian>(pov, this->pool_);
+ p->write SELECT_SIZE_ENDIAN_NAME(size, big_endian)(
+ pov, this->pool_ SELECT_SIZE_ENDIAN(size, big_endian));
pov += dyn_size;
}
Output_section::Input_section::data_size() const
{
if (this->is_input_section())
- return this->data_size_;
+ return this->u1_.data_size;
else
- return this->u_.posd->data_size();
+ return this->u2_.posd->data_size();
}
// Set the address and file offset.
void
-Output_section::Input_section::set_address(uint64_t addr, off_t off,
- off_t secoff)
+Output_section::Input_section::set_address_and_file_offset(
+ uint64_t address,
+ off_t file_offset,
+ off_t section_file_offset)
{
if (this->is_input_section())
- this->u_.object->set_section_offset(this->shndx_, off - secoff);
+ this->u2_.object->set_section_offset(this->shndx_,
+ file_offset - section_file_offset);
else
- this->u_.posd->set_address(addr, off);
+ this->u2_.posd->set_address_and_file_offset(address, file_offset);
+}
+
+// Finalize the data size.
+
+void
+Output_section::Input_section::finalize_data_size()
+{
+ if (!this->is_input_section())
+ this->u2_.posd->finalize_data_size();
+}
+
+// Try to turn an input offset into an output offset.
+
+bool
+Output_section::Input_section::output_offset(const Relobj* object,
+ unsigned int shndx,
+ off_t offset,
+ off_t *poutput) const
+{
+ if (!this->is_input_section())
+ return this->u2_.posd->output_offset(object, shndx, offset, poutput);
+ else
+ {
+ if (this->shndx_ != shndx || this->u2_.object != object)
+ return false;
+ off_t output_offset;
+ Output_section* os = object->output_section(shndx, &output_offset);
+ gold_assert(os != NULL);
+ gold_assert(output_offset != -1);
+ *poutput = output_offset + offset;
+ return true;
+ }
}
// Write out the data. We don't have to do anything for an input
Output_section::Input_section::write(Output_file* of)
{
if (!this->is_input_section())
- this->u_.posd->write(of);
+ this->u2_.posd->write(of);
+}
+
+// Write the data to a buffer. As for write(), we don't have to do
+// anything for an input section.
+
+void
+Output_section::Input_section::write_to_buffer(unsigned char* buffer)
+{
+ if (!this->is_input_section())
+ this->u2_.posd->write_to_buffer(buffer);
}
// Output_section methods.
// Construct an Output_section. NAME will point into a Stringpool.
Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
- elfcpp::Elf_Xword flags, bool may_add_data)
+ elfcpp::Elf_Xword flags)
: name_(name),
addralign_(0),
entsize_(0),
+ link_section_(NULL),
link_(0),
+ info_section_(NULL),
info_(0),
type_(type),
flags_(flags),
- out_shndx_(0),
+ out_shndx_(-1U),
symtab_index_(0),
dynsym_index_(0),
input_sections_(),
first_input_offset_(0),
- may_add_data_(may_add_data),
+ fills_(),
+ postprocessing_buffer_(NULL),
needs_symtab_index_(false),
- needs_dynsym_index_(false)
+ needs_dynsym_index_(false),
+ should_link_to_symtab_(false),
+ should_link_to_dynsym_(false),
+ after_input_sections_(false),
+ requires_postprocessing_(false)
{
+ // An unallocated section has no address. Forcing this means that
+ // we don't need special treatment for symbols defined in debug
+ // sections.
+ if ((flags & elfcpp::SHF_ALLOC) == 0)
+ this->set_address(0);
}
Output_section::~Output_section()
{
}
+// Set the entry size.
+
+void
+Output_section::set_entsize(uint64_t v)
+{
+ if (this->entsize_ == 0)
+ this->entsize_ = v;
+ else
+ gold_assert(this->entsize_ == v);
+}
+
// Add the input section SHNDX, with header SHDR, named SECNAME, in
-// OBJECT, to the Output_section. Return the offset of the input
-// section within the output section. We don't always keep track of
-// input sections for an Output_section. Instead, each Object keeps
-// track of the Output_section for each of its input sections.
+// OBJECT, to the Output_section. RELOC_SHNDX is the index of a
+// relocation section which applies to this section, or 0 if none, or
+// -1U if more than one. Return the offset of the input section
+// within the output section. Return -1 if the input section will
+// receive special handling. In the normal case we don't always keep
+// track of input sections for an Output_section. Instead, each
+// Object keeps track of the Output_section for each of its input
+// sections.
template<int size, bool big_endian>
off_t
-Output_section::add_input_section(Relobj* object, unsigned int shndx,
+Output_section::add_input_section(Sized_relobj<size, big_endian>* object,
+ unsigned int shndx,
const char* secname,
- const elfcpp::Shdr<size, big_endian>& shdr)
+ const elfcpp::Shdr<size, big_endian>& shdr,
+ unsigned int reloc_shndx)
{
- gold_assert(this->may_add_data_);
-
elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
if ((addralign & (addralign - 1)) != 0)
{
- fprintf(stderr, _("%s: %s: invalid alignment %lu for section \"%s\"\n"),
- program_name, object->name().c_str(),
- static_cast<unsigned long>(addralign), secname);
- gold_exit(false);
+ object->error(_("invalid alignment %lu for section \"%s\""),
+ static_cast<unsigned long>(addralign), secname);
+ addralign = 1;
}
if (addralign > this->addralign_)
this->addralign_ = addralign;
- off_t ssize = this->data_size();
- ssize = align_address(ssize, addralign);
- this->set_data_size(ssize + shdr.get_sh_size());
+ typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags();
+ uint64_t entsize = shdr.get_sh_entsize();
+
+ // .debug_str is a mergeable string section, but is not always so
+ // marked by compilers. Mark manually here so we can optimize.
+ if (strcmp(secname, ".debug_str") == 0)
+ {
+ sh_flags |= (elfcpp::SHF_MERGE | elfcpp::SHF_STRINGS);
+ entsize = 1;
+ }
+
+ // If this is a SHF_MERGE section, we pass all the input sections to
+ // a Output_data_merge. We don't try to handle relocations for such
+ // a section.
+ if ((sh_flags & elfcpp::SHF_MERGE) != 0
+ && reloc_shndx == 0)
+ {
+ if (this->add_merge_input_section(object, shndx, sh_flags,
+ entsize, addralign))
+ {
+ // Tell the relocation routines that they need to call the
+ // output_offset method to determine the final address.
+ return -1;
+ }
+ }
+
+ off_t offset_in_section = this->current_data_size_for_child();
+ off_t aligned_offset_in_section = align_address(offset_in_section,
+ addralign);
+
+ if (aligned_offset_in_section > offset_in_section
+ && (sh_flags & elfcpp::SHF_EXECINSTR) != 0
+ && object->target()->has_code_fill())
+ {
+ // We need to add some fill data. Using fill_list_ when
+ // possible is an optimization, since we will often have fill
+ // sections without input sections.
+ off_t fill_len = aligned_offset_in_section - offset_in_section;
+ if (this->input_sections_.empty())
+ this->fills_.push_back(Fill(offset_in_section, fill_len));
+ else
+ {
+ // FIXME: When relaxing, the size needs to adjust to
+ // maintain a constant alignment.
+ std::string fill_data(object->target()->code_fill(fill_len));
+ Output_data_const* odc = new Output_data_const(fill_data, 1);
+ this->input_sections_.push_back(Input_section(odc));
+ }
+ }
+
+ this->set_current_data_size_for_child(aligned_offset_in_section
+ + shdr.get_sh_size());
// We need to keep track of this section if we are already keeping
// track of sections, or if we are relaxing. FIXME: Add test for
// relaxing.
- if (! this->input_sections_.empty())
+ if (!this->input_sections_.empty())
this->input_sections_.push_back(Input_section(object, shndx,
shdr.get_sh_size(),
addralign));
- return ssize;
+ return aligned_offset_in_section;
}
// Add arbitrary data to an output section.
void
Output_section::add_output_section_data(Output_section_data* posd)
{
- gold_assert(this->may_add_data_);
+ Input_section inp(posd);
+ this->add_output_section_data(&inp);
+}
+// Add arbitrary data to an output section by Input_section.
+
+void
+Output_section::add_output_section_data(Input_section* inp)
+{
if (this->input_sections_.empty())
- this->first_input_offset_ = this->data_size();
+ this->first_input_offset_ = this->current_data_size_for_child();
- this->input_sections_.push_back(Input_section(posd));
+ this->input_sections_.push_back(*inp);
- uint64_t addralign = posd->addralign();
+ uint64_t addralign = inp->addralign();
if (addralign > this->addralign_)
this->addralign_ = addralign;
- posd->set_output_section(this);
+ inp->set_output_section(this);
+}
+
+// Add a merge section to an output section.
+
+void
+Output_section::add_output_merge_section(Output_section_data* posd,
+ bool is_string, uint64_t entsize)
+{
+ Input_section inp(posd, is_string, entsize);
+ this->add_output_section_data(&inp);
}
-// Set the address of an Output_section. This is where we handle
+// Add an input section to a SHF_MERGE section.
+
+bool
+Output_section::add_merge_input_section(Relobj* object, unsigned int shndx,
+ uint64_t flags, uint64_t entsize,
+ uint64_t addralign)
+{
+ bool is_string = (flags & elfcpp::SHF_STRINGS) != 0;
+
+ // We only merge strings if the alignment is not more than the
+ // character size. This could be handled, but it's unusual.
+ if (is_string && addralign > entsize)
+ return false;
+
+ Input_section_list::iterator p;
+ for (p = this->input_sections_.begin();
+ p != this->input_sections_.end();
+ ++p)
+ if (p->is_merge_section(is_string, entsize, addralign))
+ {
+ p->add_input_section(object, shndx);
+ return true;
+ }
+
+ // We handle the actual constant merging in Output_merge_data or
+ // Output_merge_string_data.
+ Output_section_data* posd;
+ if (!is_string)
+ posd = new Output_merge_data(entsize, addralign);
+ else
+ {
+ switch (entsize)
+ {
+ case 1:
+ posd = new Output_merge_string<char>(addralign);
+ break;
+ case 2:
+ posd = new Output_merge_string<uint16_t>(addralign);
+ break;
+ case 4:
+ posd = new Output_merge_string<uint32_t>(addralign);
+ break;
+ default:
+ return false;
+ }
+ }
+
+ this->add_output_merge_section(posd, is_string, entsize);
+ posd->add_input_section(object, shndx);
+
+ return true;
+}
+
+// Given an address OFFSET relative to the start of input section
+// SHNDX in OBJECT, return whether this address is being included in
+// the final link. This should only be called if SHNDX in OBJECT has
+// a special mapping.
+
+bool
+Output_section::is_input_address_mapped(const Relobj* object,
+ unsigned int shndx,
+ off_t offset) const
+{
+ gold_assert(object->is_section_specially_mapped(shndx));
+
+ for (Input_section_list::const_iterator p = this->input_sections_.begin();
+ p != this->input_sections_.end();
+ ++p)
+ {
+ off_t output_offset;
+ if (p->output_offset(object, shndx, offset, &output_offset))
+ return output_offset != -1;
+ }
+
+ // By default we assume that the address is mapped. This should
+ // only be called after we have passed all sections to Layout. At
+ // that point we should know what we are discarding.
+ return true;
+}
+
+// Given an address OFFSET relative to the start of input section
+// SHNDX in object OBJECT, return the output offset relative to the
+// start of the section. This should only be called if SHNDX in
+// OBJECT has a special mapping.
+
+off_t
+Output_section::output_offset(const Relobj* object, unsigned int shndx,
+ off_t offset) const
+{
+ gold_assert(object->is_section_specially_mapped(shndx));
+ // This can only be called meaningfully when layout is complete.
+ gold_assert(Output_data::is_layout_complete());
+
+ for (Input_section_list::const_iterator p = this->input_sections_.begin();
+ p != this->input_sections_.end();
+ ++p)
+ {
+ off_t output_offset;
+ if (p->output_offset(object, shndx, offset, &output_offset))
+ return output_offset;
+ }
+ gold_unreachable();
+}
+
+// Return the output virtual address of OFFSET relative to the start
+// of input section SHNDX in object OBJECT.
+
+uint64_t
+Output_section::output_address(const Relobj* object, unsigned int shndx,
+ off_t offset) const
+{
+ gold_assert(object->is_section_specially_mapped(shndx));
+ // This can only be called meaningfully when layout is complete.
+ gold_assert(Output_data::is_layout_complete());
+
+ uint64_t addr = this->address() + this->first_input_offset_;
+ for (Input_section_list::const_iterator p = this->input_sections_.begin();
+ p != this->input_sections_.end();
+ ++p)
+ {
+ addr = align_address(addr, p->addralign());
+ off_t output_offset;
+ if (p->output_offset(object, shndx, offset, &output_offset))
+ {
+ if (output_offset == -1)
+ return -1U;
+ return addr + output_offset;
+ }
+ addr += p->data_size();
+ }
+
+ // If we get here, it means that we don't know the mapping for this
+ // input section. This might happen in principle if
+ // add_input_section were called before add_output_section_data.
+ // But it should never actually happen.
+
+ gold_unreachable();
+}
+
+// Set the data size of an Output_section. This is where we handle
// setting the addresses of any Output_section_data objects.
void
-Output_section::do_set_address(uint64_t address, off_t startoff)
+Output_section::set_final_data_size()
{
if (this->input_sections_.empty())
- return;
+ {
+ this->set_data_size(this->current_data_size_for_child());
+ return;
+ }
+ uint64_t address = this->address();
+ off_t startoff = this->offset();
off_t off = startoff + this->first_input_offset_;
for (Input_section_list::iterator p = this->input_sections_.begin();
p != this->input_sections_.end();
++p)
{
off = align_address(off, p->addralign());
- p->set_address(address + (off - startoff), off, startoff);
+ p->set_address_and_file_offset(address + (off - startoff), off,
+ startoff);
off += p->data_size();
}
template<int size, bool big_endian>
void
-Output_section::write_header(const Stringpool* secnamepool,
+Output_section::write_header(const Layout* layout,
+ const Stringpool* secnamepool,
elfcpp::Shdr_write<size, big_endian>* oshdr) const
{
oshdr->put_sh_name(secnamepool->get_offset(this->name_));
oshdr->put_sh_addr(this->address());
oshdr->put_sh_offset(this->offset());
oshdr->put_sh_size(this->data_size());
- oshdr->put_sh_link(this->link_);
- oshdr->put_sh_info(this->info_);
+ if (this->link_section_ != NULL)
+ oshdr->put_sh_link(this->link_section_->out_shndx());
+ else if (this->should_link_to_symtab_)
+ oshdr->put_sh_link(layout->symtab_section()->out_shndx());
+ else if (this->should_link_to_dynsym_)
+ oshdr->put_sh_link(layout->dynsym_section()->out_shndx());
+ else
+ oshdr->put_sh_link(this->link_);
+ if (this->info_section_ != NULL)
+ oshdr->put_sh_info(this->info_section_->out_shndx());
+ else
+ oshdr->put_sh_info(this->info_);
oshdr->put_sh_addralign(this->addralign_);
oshdr->put_sh_entsize(this->entsize_);
}
void
Output_section::do_write(Output_file* of)
{
+ gold_assert(!this->requires_postprocessing());
+
+ off_t output_section_file_offset = this->offset();
+ for (Fill_list::iterator p = this->fills_.begin();
+ p != this->fills_.end();
+ ++p)
+ {
+ std::string fill_data(of->target()->code_fill(p->length()));
+ of->write(output_section_file_offset + p->section_offset(),
+ fill_data.data(), fill_data.size());
+ }
+
for (Input_section_list::iterator p = this->input_sections_.begin();
p != this->input_sections_.end();
++p)
p->write(of);
}
+// If a section requires postprocessing, create the buffer to use.
+
+void
+Output_section::create_postprocessing_buffer()
+{
+ gold_assert(this->requires_postprocessing());
+ gold_assert(this->postprocessing_buffer_ == NULL);
+
+ if (!this->input_sections_.empty())
+ {
+ off_t off = this->first_input_offset_;
+ for (Input_section_list::iterator p = this->input_sections_.begin();
+ p != this->input_sections_.end();
+ ++p)
+ {
+ off = align_address(off, p->addralign());
+ p->finalize_data_size();
+ off += p->data_size();
+ }
+ this->set_current_data_size_for_child(off);
+ }
+
+ off_t buffer_size = this->current_data_size_for_child();
+ this->postprocessing_buffer_ = new unsigned char[buffer_size];
+}
+
+// Write all the data of an Output_section into the postprocessing
+// buffer. This is used for sections which require postprocessing,
+// such as compression. Input sections are handled by
+// Object::Relocate.
+
+void
+Output_section::write_to_postprocessing_buffer()
+{
+ gold_assert(this->requires_postprocessing());
+
+ Target* target = parameters->target();
+ unsigned char* buffer = this->postprocessing_buffer();
+ for (Fill_list::iterator p = this->fills_.begin();
+ p != this->fills_.end();
+ ++p)
+ {
+ std::string fill_data(target->code_fill(p->length()));
+ memcpy(buffer + p->section_offset(), fill_data.data(), fill_data.size());
+ }
+
+ off_t off = this->first_input_offset_;
+ for (Input_section_list::iterator p = this->input_sections_.begin();
+ p != this->input_sections_.end();
+ ++p)
+ {
+ off = align_address(off, p->addralign());
+ p->write_to_buffer(buffer + off);
+ off += p->data_size();
+ }
+}
+
// Output segment methods.
Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
// SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
// case: we group the SHF_TLS/SHT_NOBITS sections right after the
// SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
- // correctly.
- if ((os->flags() & elfcpp::SHF_TLS) != 0 && !this->output_data_.empty())
+ // correctly. SHF_TLS sections get added to both a PT_LOAD segment
+ // and the PT_TLS segment -- we do this grouping only for the
+ // PT_LOAD segment.
+ if (this->type_ != elfcpp::PT_TLS
+ && (os->flags() & elfcpp::SHF_TLS) != 0
+ && !this->output_data_.empty())
{
pdl = &this->output_data_;
bool nobits = os->type() == elfcpp::SHT_NOBITS;
return ret;
}
+// Return the number of dynamic relocs applied to this segment.
+
+unsigned int
+Output_segment::dynamic_reloc_count() const
+{
+ return (this->dynamic_reloc_count_list(&this->output_data_)
+ + this->dynamic_reloc_count_list(&this->output_bss_));
+}
+
+// Return the number of dynamic relocs applied to an Output_data_list.
+
+unsigned int
+Output_segment::dynamic_reloc_count_list(const Output_data_list* pdl) const
+{
+ unsigned int count = 0;
+ for (Output_data_list::const_iterator p = pdl->begin();
+ p != pdl->end();
+ ++p)
+ count += (*p)->dynamic_reloc_count();
+ return count;
+}
+
// Set the section addresses for an Output_segment. ADDR is the
// address and *POFF is the file offset. Set the section indexes
// starting with *PSHNDX. Return the address of the immediately
return ret;
}
-// Set the addresses in a list of Output_data structures.
+// Set the addresses and file offsets in a list of Output_data
+// structures.
uint64_t
Output_segment::set_section_list_addresses(Output_data_list* pdl,
++p)
{
off = align_address(off, (*p)->addralign());
- (*p)->set_address(addr + (off - startoff), off);
+ (*p)->set_address_and_file_offset(addr + (off - startoff), off);
// Unless this is a PT_TLS segment, we want to ignore the size
// of a SHF_TLS/SHT_NOBITS section. Such a section does not
template<int size, bool big_endian>
unsigned char*
-Output_segment::write_section_headers(const Stringpool* secnamepool,
+Output_segment::write_section_headers(const Layout* layout,
+ const Stringpool* secnamepool,
unsigned char* v,
unsigned int *pshndx
ACCEPT_SIZE_ENDIAN) const
v = this->write_section_headers_list
SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
- secnamepool, &this->output_data_, v, pshndx
+ layout, secnamepool, &this->output_data_, v, pshndx
SELECT_SIZE_ENDIAN(size, big_endian));
v = this->write_section_headers_list
SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
- secnamepool, &this->output_bss_, v, pshndx
+ layout, secnamepool, &this->output_bss_, v, pshndx
SELECT_SIZE_ENDIAN(size, big_endian));
return v;
}
template<int size, bool big_endian>
unsigned char*
-Output_segment::write_section_headers_list(const Stringpool* secnamepool,
+Output_segment::write_section_headers_list(const Layout* layout,
+ const Stringpool* secnamepool,
const Output_data_list* pdl,
unsigned char* v,
unsigned int* pshndx
const Output_section* ps = static_cast<const Output_section*>(*p);
gold_assert(*pshndx == ps->out_shndx());
elfcpp::Shdr_write<size, big_endian> oshdr(v);
- ps->write_header(secnamepool, &oshdr);
+ ps->write_header(layout, secnamepool, &oshdr);
v += shdr_size;
++*pshndx;
}
// Output_file methods.
-Output_file::Output_file(const General_options& options)
+Output_file::Output_file(const General_options& options, Target* target)
: options_(options),
+ target_(target),
name_(options.output_file_name()),
o_(-1),
file_size_(0),
{
this->file_size_ = file_size;
- int mode = this->options_.is_relocatable() ? 0666 : 0777;
+ // Unlink the file first; otherwise the open() may fail if the file
+ // is busy (e.g. it's an executable that's currently being executed).
+ //
+ // However, the linker may be part of a system where a zero-length
+ // file is created for it to write to, with tight permissions (gcc
+ // 2.95 did something like this). Unlinking the file would work
+ // around those permission controls, so we only unlink if the file
+ // has a non-zero size. We also unlink only regular files to avoid
+ // trouble with directories/etc.
+ //
+ // If we fail, continue; this command is merely a best-effort attempt
+ // to improve the odds for open().
+
+ struct stat s;
+ if (::stat(this->name_, &s) == 0 && s.st_size != 0)
+ unlink_if_ordinary(this->name_);
+
+ int mode = parameters->output_is_object() ? 0666 : 0777;
int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode);
if (o < 0)
- {
- fprintf(stderr, _("%s: %s: open: %s\n"),
- program_name, this->name_, strerror(errno));
- gold_exit(false);
- }
+ gold_fatal(_("%s: open: %s"), this->name_, strerror(errno));
this->o_ = o;
+ this->map();
+}
+
+// Resize the output file.
+
+void
+Output_file::resize(off_t file_size)
+{
+ if (::munmap(this->base_, this->file_size_) < 0)
+ gold_error(_("%s: munmap: %s"), this->name_, strerror(errno));
+ this->file_size_ = file_size;
+ this->map();
+}
+
+// Map the file into memory.
+
+void
+Output_file::map()
+{
+ int o = this->o_;
+
// Write out one byte to make the file the right size.
- if (::lseek(o, file_size - 1, SEEK_SET) < 0)
- {
- fprintf(stderr, _("%s: %s: lseek: %s\n"),
- program_name, this->name_, strerror(errno));
- gold_exit(false);
- }
+ if (::lseek(o, this->file_size_ - 1, SEEK_SET) < 0)
+ gold_fatal(_("%s: lseek: %s"), this->name_, strerror(errno));
char b = 0;
if (::write(o, &b, 1) != 1)
- {
- fprintf(stderr, _("%s: %s: write: %s\n"),
- program_name, this->name_, strerror(errno));
- gold_exit(false);
- }
+ gold_fatal(_("%s: write: %s"), this->name_, strerror(errno));
// Map the file into memory.
- void* base = ::mmap(NULL, file_size, PROT_READ | PROT_WRITE,
+ void* base = ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE,
MAP_SHARED, o, 0);
if (base == MAP_FAILED)
- {
- fprintf(stderr, _("%s: %s: mmap: %s\n"),
- program_name, this->name_, strerror(errno));
- gold_exit(false);
- }
+ gold_fatal(_("%s: mmap: %s"), this->name_, strerror(errno));
this->base_ = static_cast<unsigned char*>(base);
}
Output_file::close()
{
if (::munmap(this->base_, this->file_size_) < 0)
- {
- fprintf(stderr, _("%s: %s: munmap: %s\n"),
- program_name, this->name_, strerror(errno));
- gold_exit(false);
- }
+ gold_error(_("%s: munmap: %s"), this->name_, strerror(errno));
this->base_ = NULL;
if (::close(this->o_) < 0)
- {
- fprintf(stderr, _("%s: %s: close: %s\n"),
- program_name, this->name_, strerror(errno));
- gold_exit(false);
- }
+ gold_error(_("%s: close: %s"), this->name_, strerror(errno));
this->o_ = -1;
}
// 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
off_t
Output_section::add_input_section<32, false>(
- Relobj* object,
+ Sized_relobj<32, false>* object,
unsigned int shndx,
const char* secname,
- const elfcpp::Shdr<32, false>& shdr);
+ const elfcpp::Shdr<32, false>& shdr,
+ unsigned int reloc_shndx);
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
off_t
Output_section::add_input_section<32, true>(
- Relobj* object,
+ Sized_relobj<32, true>* object,
unsigned int shndx,
const char* secname,
- const elfcpp::Shdr<32, true>& shdr);
+ const elfcpp::Shdr<32, true>& shdr,
+ unsigned int reloc_shndx);
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
off_t
Output_section::add_input_section<64, false>(
- Relobj* object,
+ Sized_relobj<64, false>* object,
unsigned int shndx,
const char* secname,
- const elfcpp::Shdr<64, false>& shdr);
+ const elfcpp::Shdr<64, false>& shdr,
+ unsigned int reloc_shndx);
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
off_t
Output_section::add_input_section<64, true>(
- Relobj* object,
+ Sized_relobj<64, true>* object,
unsigned int shndx,
const char* secname,
- const elfcpp::Shdr<64, true>& shdr);
+ const elfcpp::Shdr<64, true>& shdr,
+ unsigned int reloc_shndx);
+#endif
+#ifdef HAVE_TARGET_32_LITTLE
template
class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>;
+#endif
+#ifdef HAVE_TARGET_32_LITTLE
template
class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>;
+#endif
+#ifdef HAVE_TARGET_32_LITTLE
template
class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>;
+#endif
+#ifdef HAVE_TARGET_32_LITTLE
template
class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>;
+#endif
+#ifdef HAVE_TARGET_32_LITTLE
template
class Output_data_got<32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
class Output_data_got<32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
class Output_data_got<64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
class Output_data_got<64, true>;
+#endif
} // End namespace gold.
projects / platform / upstream / binutils.git / blobdiff