// layout.cc -- lay out output file sections 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 <cassert>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <utility>
+#include "parameters.h"
#include "output.h"
+#include "symtab.h"
+#include "dynobj.h"
+#include "ehframe.h"
#include "layout.h"
namespace gold
{
-// Layout_task methods.
-
-Layout_task::~Layout_task()
-{
-}
-
-// This task can be run when it is unblocked.
-
-Task::Is_runnable_type
-Layout_task::is_runnable(Workqueue*)
-{
- if (this->this_blocker_->is_blocked())
- return IS_BLOCKED;
- return IS_RUNNABLE;
-}
-
-// We don't need to hold any locks for the duration of this task. In
-// fact this task will be the only one running.
-
-Task_locker*
-Layout_task::locks(Workqueue*)
-{
- return NULL;
-}
+// Layout_task_runner methods.
// Lay out the sections. This is called after all the input objects
// have been read.
void
-Layout_task::run(Workqueue*)
+Layout_task_runner::run(Workqueue* workqueue)
{
- Layout layout(this->options_);
- layout.init();
- for (Input_objects::Object_list::const_iterator p =
- this->input_objects_->begin();
- p != this->input_objects_->end();
- ++p)
- (*p)->layout(&layout);
- layout.finalize(this->input_objects_);
+ off_t file_size = this->layout_->finalize(this->input_objects_,
+ this->symtab_);
+
+ // Now we know the final size of the output file and we know where
+ // each piece of information goes.
+ Output_file* of = new Output_file(this->options_,
+ this->input_objects_->target());
+ of->open(file_size);
+
+ // Queue up the final set of tasks.
+ gold::queue_final_tasks(this->options_, this->input_objects_,
+ this->symtab_, this->layout_, workqueue, of);
}
// Layout methods.
Layout::Layout(const General_options& options)
- : options_(options), namepool_(), signatures_(),
+ : options_(options), namepool_(), sympool_(), dynpool_(), signatures_(),
section_name_map_(), segment_list_(), section_list_(),
- data_list_()
-{
-}
-
-// Prepare for doing layout.
-
-void
-Layout::init()
+ unattached_section_list_(), special_output_list_(),
+ section_headers_(NULL), tls_segment_(NULL), symtab_section_(NULL),
+ dynsym_section_(NULL), dynamic_section_(NULL), dynamic_data_(NULL),
+ eh_frame_section_(NULL), output_file_size_(-1),
+ input_requires_executable_stack_(false),
+ input_with_gnu_stack_note_(false),
+ input_without_gnu_stack_note_(false)
{
// Make space for more than enough segments for a typical file.
// This is just for efficiency--it's OK if we wind up needing more.
- segment_list_.reserve(12);
+ this->segment_list_.reserve(12);
+
+ // We expect two unattached Output_data objects: the file header and
+ // the segment headers.
+ this->special_output_list_.reserve(2);
}
// Hash a key we use to look up an output section mapping.
size_t
Layout::Hash_key::operator()(const Layout::Key& k) const
{
- return reinterpret_cast<size_t>(k.first) + k.second.first + k.second.second;
+ return k.first + k.second.first + k.second.second;
+}
+
+// Return whether PREFIX is a prefix of STR.
+
+static inline bool
+is_prefix_of(const char* prefix, const char* str)
+{
+ return strncmp(prefix, str, strlen(prefix)) == 0;
+}
+
+// Returns whether the given section is in the list of
+// debug-sections-used-by-some-version-of-gdb. Currently,
+// we've checked versions of gdb up to and including 6.7.1.
+
+static const char* gdb_sections[] =
+{ ".debug_abbrev",
+ // ".debug_aranges", // not used by gdb as of 6.7.1
+ ".debug_frame",
+ ".debug_info",
+ ".debug_line",
+ ".debug_loc",
+ ".debug_macinfo",
+ // ".debug_pubnames", // not used by gdb as of 6.7.1
+ ".debug_ranges",
+ ".debug_str",
+};
+
+static inline bool
+is_gdb_debug_section(const char* str)
+{
+ // We can do this faster: binary search or a hashtable. But why bother?
+ for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i)
+ if (strcmp(str, gdb_sections[i]) == 0)
+ return true;
+ return false;
}
// Whether to include this section in the link.
template<int size, bool big_endian>
bool
-Layout::include_section(Object*, const char*,
+Layout::include_section(Sized_relobj<size, big_endian>*, const char* name,
const elfcpp::Shdr<size, big_endian>& shdr)
{
// Some section types are never linked. Some are only linked when
case elfcpp::SHT_RELA:
case elfcpp::SHT_REL:
case elfcpp::SHT_GROUP:
- return this->options_.is_relocatable();
+ return parameters->output_is_object();
+
+ case elfcpp::SHT_PROGBITS:
+ if (parameters->strip_debug()
+ && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+ {
+ // Debugging sections can only be recognized by name.
+ if (is_prefix_of(".debug", name)
+ || is_prefix_of(".gnu.linkonce.wi.", name)
+ || is_prefix_of(".line", name)
+ || is_prefix_of(".stab", name))
+ return false;
+ }
+ if (parameters->strip_debug_gdb()
+ && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+ {
+ // Debugging sections can only be recognized by name.
+ if (is_prefix_of(".debug", name)
+ && !is_gdb_debug_section(name))
+ return false;
+ }
+ return true;
default:
- // FIXME: Handle stripping debug sections here.
return true;
}
}
-// Return the output section to use for input section NAME, with
-// header HEADER, from object OBJECT. Set *OFF to the offset of this
-// input section without the output section.
+// Return an output section named NAME, or NULL if there is none.
-template<int size, bool big_endian>
Output_section*
-Layout::layout(Object* object, const char* name,
- const elfcpp::Shdr<size, big_endian>& shdr, off_t* off)
+Layout::find_output_section(const char* name) const
{
- if (!this->include_section(object, name, shdr))
- return NULL;
-
- // Unless we are doing a relocateable link, .gnu.linkonce sections
- // are laid out as though they were named for the sections are
- // placed into.
- if (!this->options_.is_relocatable() && Layout::is_linkonce(name))
- name = Layout::linkonce_output_name(name);
-
- // FIXME: Handle SHF_OS_NONCONFORMING here.
+ for (Section_name_map::const_iterator p = this->section_name_map_.begin();
+ p != this->section_name_map_.end();
+ ++p)
+ if (strcmp(p->second->name(), name) == 0)
+ return p->second;
+ return NULL;
+}
- // Canonicalize the section name.
- name = this->namepool_.add(name);
+// Return an output segment of type TYPE, with segment flags SET set
+// and segment flags CLEAR clear. Return NULL if there is none.
- // Find the output section. The output section is selected based on
- // the section name, type, and flags.
+Output_segment*
+Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set,
+ elfcpp::Elf_Word clear) const
+{
+ for (Segment_list::const_iterator p = this->segment_list_.begin();
+ p != this->segment_list_.end();
+ ++p)
+ if (static_cast<elfcpp::PT>((*p)->type()) == type
+ && ((*p)->flags() & set) == set
+ && ((*p)->flags() & clear) == 0)
+ return *p;
+ return NULL;
+}
- // FIXME: If we want to do relaxation, we need to modify this
- // algorithm. We also build a list of input sections for each
- // output section. Then we relax all the input sections. Then we
- // walk down the list and adjust all the offsets.
+// Return the output section to use for section NAME with type TYPE
+// and section flags FLAGS.
- elfcpp::Elf_Word type = shdr.get_sh_type();
- elfcpp::Elf_Xword flags = shdr.get_sh_flags();
- const Key key(name, std::make_pair(type, flags));
+Output_section*
+Layout::get_output_section(const char* name, Stringpool::Key name_key,
+ elfcpp::Elf_Word type, elfcpp::Elf_Xword flags)
+{
+ // We should ignore some flags.
+ flags &= ~ (elfcpp::SHF_INFO_LINK
+ | elfcpp::SHF_LINK_ORDER
+ | elfcpp::SHF_GROUP
+ | elfcpp::SHF_MERGE
+ | elfcpp::SHF_STRINGS);
+
+ const Key key(name_key, std::make_pair(type, flags));
const std::pair<Key, Output_section*> v(key, NULL);
std::pair<Section_name_map::iterator, bool> ins(
this->section_name_map_.insert(v));
- Output_section* os;
if (!ins.second)
- os = ins.first->second;
+ return ins.first->second;
else
{
// This is the first time we've seen this name/type/flags
// combination.
- os = this->make_output_section(name, type, flags);
+ Output_section* os = this->make_output_section(name, type, flags);
ins.first->second = os;
+ return os;
}
+}
+
+// Return the output section to use for input section SHNDX, with name
+// NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the
+// index of a relocation section which applies to this section, or 0
+// if none, or -1U if more than one. RELOC_TYPE is the type of the
+// relocation section if there is one. Set *OFF to the offset of this
+// input section without the output section. Return NULL if the
+// section should be discarded. Set *OFF to -1 if the section
+// contents should not be written directly to the output file, but
+// will instead receive special handling.
+
+template<int size, bool big_endian>
+Output_section*
+Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx,
+ const char* name, const elfcpp::Shdr<size, big_endian>& shdr,
+ unsigned int reloc_shndx, unsigned int, off_t* off)
+{
+ if (!this->include_section(object, name, shdr))
+ return NULL;
+
+ // If we are not doing a relocateable link, choose the name to use
+ // for the output section.
+ size_t len = strlen(name);
+ if (!parameters->output_is_object())
+ name = Layout::output_section_name(name, &len);
+
+ // FIXME: Handle SHF_OS_NONCONFORMING here.
+
+ // Canonicalize the section name.
+ Stringpool::Key name_key;
+ name = this->namepool_.add_prefix(name, len, &name_key);
+
+ // Find the output section. The output section is selected based on
+ // the section name, type, and flags.
+ Output_section* os = this->get_output_section(name, name_key,
+ shdr.get_sh_type(),
+ shdr.get_sh_flags());
// FIXME: Handle SHF_LINK_ORDER somewhere.
- *off = os->add_input_section(object, name, shdr);
+ *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx);
return os;
}
-// Return whether SEG1 should be before SEG2 in the output file. This
-// is based entirely on the segment type and flags. When this is
-// called the segment addresses has normally not yet been set.
+// Special GNU handling of sections name .eh_frame. They will
+// normally hold exception frame data as defined by the C++ ABI
+// (http://codesourcery.com/cxx-abi/).
-bool
-Layout::segment_precedes(const Output_segment* seg1,
- const Output_segment* seg2)
+template<int size, bool big_endian>
+Output_section*
+Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object,
+ const unsigned char* symbols,
+ off_t symbols_size,
+ const unsigned char* symbol_names,
+ off_t symbol_names_size,
+ unsigned int shndx,
+ const elfcpp::Shdr<size, big_endian>& shdr,
+ unsigned int reloc_shndx, unsigned int reloc_type,
+ off_t* off)
{
- elfcpp::Elf_Word type1 = seg1->type();
- elfcpp::Elf_Word type2 = seg2->type();
+ gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS);
+ gold_assert(shdr.get_sh_flags() == elfcpp::SHF_ALLOC);
- // The single PT_PHDR segment is required to precede any loadable
- // segment. We simply make it always first.
- if (type1 == elfcpp::PT_PHDR)
- {
- assert(type2 != elfcpp::PT_PHDR);
- return true;
- }
- if (type2 == elfcpp::PT_PHDR)
- return false;
+ Stringpool::Key name_key;
+ const char* name = this->namepool_.add(".eh_frame", false, &name_key);
- // The single PT_INTERP segment is required to precede any loadable
- // segment. We simply make it always second.
- if (type1 == elfcpp::PT_INTERP)
- {
- assert(type2 != elfcpp::PT_INTERP);
- return true;
- }
- if (type2 == elfcpp::PT_INTERP)
- return false;
+ Output_section* os = this->get_output_section(name, name_key,
+ elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC);
- // We then put PT_LOAD segments before any other segments.
- if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD)
- return true;
- if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD)
- return false;
+ if (this->eh_frame_section_ == NULL)
+ {
+ this->eh_frame_section_ = os;
+ this->eh_frame_data_ = new Eh_frame();
+ os->add_output_section_data(this->eh_frame_data_);
- const elfcpp::Elf_Word flags1 = seg1->flags();
- const elfcpp::Elf_Word flags2 = seg2->flags();
+ if (this->options_.create_eh_frame_hdr())
+ {
+ Stringpool::Key hdr_name_key;
+ const char* hdr_name = this->namepool_.add(".eh_frame_hdr",
+ false,
+ &hdr_name_key);
+ Output_section* hdr_os =
+ this->get_output_section(hdr_name, hdr_name_key,
+ elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC);
+
+ Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, this->eh_frame_data_);
+ hdr_os->add_output_section_data(hdr_posd);
+
+ hdr_os->set_after_input_sections();
+
+ Output_segment* hdr_oseg =
+ new Output_segment(elfcpp::PT_GNU_EH_FRAME, elfcpp::PF_R);
+ this->segment_list_.push_back(hdr_oseg);
+ hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R);
+
+ this->eh_frame_data_->set_eh_frame_hdr(hdr_posd);
+ }
+ }
- // The order of non-PT_LOAD segments is unimportant. We simply sort
- // by the numeric segment type and flags values. There should not
- // be more than one segment with the same type and flags.
- if (type1 != elfcpp::PT_LOAD)
+ gold_assert(this->eh_frame_section_ == os);
+
+ if (this->eh_frame_data_->add_ehframe_input_section(object,
+ symbols,
+ symbols_size,
+ symbol_names,
+ symbol_names_size,
+ shndx,
+ reloc_shndx,
+ reloc_type))
+ *off = -1;
+ else
{
- if (type1 != type2)
- return type1 < type2;
- assert(flags1 != flags2);
- return flags1 < flags2;
+ // We couldn't handle this .eh_frame section for some reason.
+ // Add it as a normal section.
+ *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx);
}
- // We sort PT_LOAD segments based on the flags. Readonly segments
- // come before writable segments. Then executable segments come
- // before non-executable segments. Then the unlikely case of a
- // non-readable segment comes before the normal case of a readable
- // segment. If there are multiple segments with the same type and
- // flags, we require that the address be set, and we sort by
- // virtual address and then physical address.
- if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W))
- return (flags1 & elfcpp::PF_W) == 0;
- if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X))
- return (flags1 & elfcpp::PF_X) != 0;
- if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R))
- return (flags1 & elfcpp::PF_R) == 0;
+ return os;
+}
- uint64_t vaddr1 = seg1->vaddr();
- uint64_t vaddr2 = seg2->vaddr();
- if (vaddr1 != vaddr2)
- return vaddr1 < vaddr2;
+// Add POSD to an output section using NAME, TYPE, and FLAGS.
- uint64_t paddr1 = seg1->paddr();
- uint64_t paddr2 = seg2->paddr();
- assert(paddr1 != paddr2);
- return paddr1 < paddr2;
+void
+Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type,
+ elfcpp::Elf_Xword flags,
+ Output_section_data* posd)
+{
+ // Canonicalize the name.
+ Stringpool::Key name_key;
+ name = this->namepool_.add(name, true, &name_key);
+
+ Output_section* os = this->get_output_section(name, name_key, type, flags);
+ os->add_output_section_data(posd);
}
// Map section flags to segment flags.
Layout::make_output_section(const char* name, elfcpp::Elf_Word type,
elfcpp::Elf_Xword flags)
{
- Output_section* os = new Output_section(name, type, flags);
+ Output_section* os = new Output_section(this->options_, name, type, flags);
+ this->section_list_.push_back(os);
if ((flags & elfcpp::SHF_ALLOC) == 0)
- this->section_list_.push_back(os);
+ this->unattached_section_list_.push_back(os);
else
{
// This output section goes into a PT_LOAD segment.
if ((*p)->type() == elfcpp::PT_LOAD
&& ((*p)->flags() & elfcpp::PF_W) == (seg_flags & elfcpp::PF_W))
{
- (*p)->add_output_section(os);
+ (*p)->add_output_section(os, seg_flags);
break;
}
}
Output_segment* oseg = new Output_segment(elfcpp::PT_LOAD,
seg_flags);
this->segment_list_.push_back(oseg);
- oseg->add_output_section(os);
+ oseg->add_output_section(os, seg_flags);
}
// If we see a loadable SHT_NOTE section, we create a PT_NOTE
&& (((*p)->flags() & elfcpp::PF_W)
== (seg_flags & elfcpp::PF_W)))
{
- (*p)->add_output_section(os);
+ (*p)->add_output_section(os, seg_flags);
break;
}
}
Output_segment* oseg = new Output_segment(elfcpp::PT_NOTE,
seg_flags);
this->segment_list_.push_back(oseg);
- oseg->add_output_section(os);
+ oseg->add_output_section(os, seg_flags);
}
}
// If we see a loadable SHF_TLS section, we create a PT_TLS
- // segment.
+ // segment. There can only be one such segment.
if ((flags & elfcpp::SHF_TLS) != 0)
{
- // See if we already have an equivalent PT_TLS segment.
- for (p = this->segment_list_.begin();
- p != segment_list_.end();
- ++p)
- {
- if ((*p)->type() == elfcpp::PT_TLS
- && (((*p)->flags() & elfcpp::PF_W)
- == (seg_flags & elfcpp::PF_W)))
- {
- (*p)->add_output_section(os);
- break;
- }
- }
-
- if (p == this->segment_list_.end())
+ if (this->tls_segment_ == NULL)
{
- Output_segment* oseg = new Output_segment(elfcpp::PT_TLS,
- seg_flags);
- this->segment_list_.push_back(oseg);
- oseg->add_output_section(os);
+ this->tls_segment_ = new Output_segment(elfcpp::PT_TLS,
+ seg_flags);
+ this->segment_list_.push_back(this->tls_segment_);
}
+ this->tls_segment_->add_output_section(os, seg_flags);
}
}
return os;
}
-// Create the sections for the symbol table.
+// Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK
+// is whether we saw a .note.GNU-stack section in the object file.
+// GNU_STACK_FLAGS is the section flags. The flags give the
+// protection required for stack memory. We record this in an
+// executable as a PT_GNU_STACK segment. If an object file does not
+// have a .note.GNU-stack segment, we must assume that it is an old
+// object. On some targets that will force an executable stack.
+
+void
+Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags)
+{
+ if (!seen_gnu_stack)
+ this->input_without_gnu_stack_note_ = true;
+ else
+ {
+ this->input_with_gnu_stack_note_ = true;
+ if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0)
+ this->input_requires_executable_stack_ = true;
+ }
+}
+
+// Create the dynamic sections which are needed before we read the
+// relocs.
+
+void
+Layout::create_initial_dynamic_sections(const Input_objects* input_objects,
+ Symbol_table* symtab)
+{
+ if (parameters->doing_static_link())
+ return;
+
+ const char* dynamic_name = this->namepool_.add(".dynamic", false, NULL);
+ this->dynamic_section_ = this->make_output_section(dynamic_name,
+ elfcpp::SHT_DYNAMIC,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE));
+
+ symtab->define_in_output_data(input_objects->target(), "_DYNAMIC", NULL,
+ this->dynamic_section_, 0, 0,
+ elfcpp::STT_OBJECT, elfcpp::STB_LOCAL,
+ elfcpp::STV_HIDDEN, 0, false, false);
+
+ this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_);
+
+ this->dynamic_section_->add_output_section_data(this->dynamic_data_);
+}
+
+// For each output section whose name can be represented as C symbol,
+// define __start and __stop symbols for the section. This is a GNU
+// extension.
void
-Layout::create_symtab_sections()
+Layout::define_section_symbols(Symbol_table* symtab, const Target* target)
+{
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ const char* const name = (*p)->name();
+ if (name[strspn(name,
+ ("0123456789"
+ "ABCDEFGHIJKLMNOPWRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "_"))]
+ == '\0')
+ {
+ const std::string name_string(name);
+ const std::string start_name("__start_" + name_string);
+ const std::string stop_name("__stop_" + name_string);
+
+ symtab->define_in_output_data(target,
+ start_name.c_str(),
+ NULL, // version
+ *p,
+ 0, // value
+ 0, // symsize
+ elfcpp::STT_NOTYPE,
+ elfcpp::STB_GLOBAL,
+ elfcpp::STV_DEFAULT,
+ 0, // nonvis
+ false, // offset_is_from_end
+ false); // only_if_ref
+
+ symtab->define_in_output_data(target,
+ stop_name.c_str(),
+ NULL, // version
+ *p,
+ 0, // value
+ 0, // symsize
+ elfcpp::STT_NOTYPE,
+ elfcpp::STB_GLOBAL,
+ elfcpp::STV_DEFAULT,
+ 0, // nonvis
+ true, // offset_is_from_end
+ false); // only_if_ref
+ }
+ }
+}
+
+// Find the first read-only PT_LOAD segment, creating one if
+// necessary.
+
+Output_segment*
+Layout::find_first_load_seg()
{
+ for (Segment_list::const_iterator p = this->segment_list_.begin();
+ p != this->segment_list_.end();
+ ++p)
+ {
+ if ((*p)->type() == elfcpp::PT_LOAD
+ && ((*p)->flags() & elfcpp::PF_R) != 0
+ && ((*p)->flags() & elfcpp::PF_W) == 0)
+ return *p;
+ }
+
+ Output_segment* load_seg = new Output_segment(elfcpp::PT_LOAD, elfcpp::PF_R);
+ this->segment_list_.push_back(load_seg);
+ return load_seg;
}
// Finalize the layout. When this is called, we have created all the
// 4) Determine the final file offset of all the SHF_ALLOC output
// sections.
-// 5) Finalize the symbol table: set symbol values to their final
+// 5) Create the symbol table sections and the section name table
+// section.
+
+// 6) Finalize the symbol table: set symbol values to their final
// value and make a final determination of which symbols are going
// into the output symbol table.
-// 6) Create the symbol table sections and the section name table
-// section.
-
// 7) Create the section table header.
// 8) Determine the final file offset of all the output sections which
// 9) Finalize the ELF file header.
-void
-Layout::finalize(const Input_objects* input_objects)
+// This function returns the size of the output file.
+
+off_t
+Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab)
{
- if (input_objects->any_dynamic())
+ Target* const target = input_objects->target();
+
+ target->finalize_sections(this);
+
+ this->create_gold_note();
+ this->create_executable_stack_info(target);
+
+ Output_segment* phdr_seg = NULL;
+ if (!parameters->doing_static_link())
{
- // If there are any dynamic objects in the link, then we need
- // some additional segments: PT_PHDRS, PT_INTERP, and
- // PT_DYNAMIC. We also need to finalize the dynamic symbol
- // table and create the dynamic hash table.
- abort();
+ // There was a dynamic object in the link. We need to create
+ // some information for the dynamic linker.
+
+ // Create the PT_PHDR segment which will hold the program
+ // headers.
+ phdr_seg = new Output_segment(elfcpp::PT_PHDR, elfcpp::PF_R);
+ this->segment_list_.push_back(phdr_seg);
+
+ // Create the dynamic symbol table, including the hash table.
+ Output_section* dynstr;
+ std::vector<Symbol*> dynamic_symbols;
+ unsigned int local_dynamic_count;
+ Versions versions;
+ this->create_dynamic_symtab(target, symtab, &dynstr,
+ &local_dynamic_count, &dynamic_symbols,
+ &versions);
+
+ // Create the .interp section to hold the name of the
+ // interpreter, and put it in a PT_INTERP segment.
+ if (!parameters->output_is_shared())
+ this->create_interp(target);
+
+ // Finish the .dynamic section to hold the dynamic data, and put
+ // it in a PT_DYNAMIC segment.
+ this->finish_dynamic_section(input_objects, symtab);
+
+ // We should have added everything we need to the dynamic string
+ // table.
+ this->dynpool_.set_string_offsets();
+
+ // Create the version sections. We can't do this until the
+ // dynamic string table is complete.
+ this->create_version_sections(&versions, symtab, local_dynamic_count,
+ dynamic_symbols, dynstr);
}
// FIXME: Handle PT_GNU_STACK.
- std::sort(this->segment_list_.begin(), this->segment_list_.end(),
- Layout::Compare_segments());
+ Output_segment* load_seg = this->find_first_load_seg();
+ // Lay out the segment headers.
Output_segment_headers* segment_headers;
segment_headers = new Output_segment_headers(this->segment_list_);
-}
+ load_seg->add_initial_output_data(segment_headers);
+ this->special_output_list_.push_back(segment_headers);
+ if (phdr_seg != NULL)
+ phdr_seg->add_initial_output_data(segment_headers);
-// The mapping of .gnu.linkonce section names to real section names.
+ // Lay out the file header.
+ Output_file_header* file_header;
+ file_header = new Output_file_header(target, symtab, segment_headers);
+ load_seg->add_initial_output_data(file_header);
+ this->special_output_list_.push_back(file_header);
-#define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t }
-const Layout::Linkonce_mapping Layout::linkonce_mapping[] =
-{
- MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d".
- MAPPING_INIT("t", ".text"),
- MAPPING_INIT("r", ".rodata"),
- MAPPING_INIT("d", ".data"),
- MAPPING_INIT("b", ".bss"),
- MAPPING_INIT("s", ".sdata"),
- MAPPING_INIT("sb", ".sbss"),
- MAPPING_INIT("s2", ".sdata2"),
- MAPPING_INIT("sb2", ".sbss2"),
- MAPPING_INIT("wi", ".debug_info"),
- MAPPING_INIT("td", ".tdata"),
- MAPPING_INIT("tb", ".tbss"),
- MAPPING_INIT("lr", ".lrodata"),
- MAPPING_INIT("l", ".ldata"),
- MAPPING_INIT("lb", ".lbss"),
-};
-#undef MAPPING_INIT
+ // We set the output section indexes in set_segment_offsets and
+ // set_section_indexes.
+ unsigned int shndx = 1;
-const int Layout::linkonce_mapping_count =
- sizeof(Layout::linkonce_mapping) / sizeof(Layout::linkonce_mapping[0]);
+ // Set the file offsets of all the segments, and all the sections
+ // they contain.
+ off_t off = this->set_segment_offsets(target, load_seg, &shndx);
-// Return the name of the output section to use for a .gnu.linkonce
-// section. This is based on the default ELF linker script of the old
-// GNU linker. For example, we map a name like ".gnu.linkonce.t.foo"
-// to ".text".
+ // Create the symbol table sections.
+ this->create_symtab_sections(input_objects, symtab, &off);
-const char*
-Layout::linkonce_output_name(const char* name)
-{
- const char* s = name + sizeof(".gnu.linkonce") - 1;
- if (*s != '.')
- return name;
- ++s;
- const Linkonce_mapping* plm = linkonce_mapping;
- for (int i = 0; i < linkonce_mapping_count; ++i, ++plm)
- {
- if (strncmp(s, plm->from, plm->fromlen) == 0 && s[plm->fromlen] == '.')
- return plm->to;
- }
- return name;
-}
+ // Create the .shstrtab section.
+ Output_section* shstrtab_section = this->create_shstrtab();
-// Record the signature of a comdat section, and return whether to
-// include it in the link. If GROUP is true, this is a regular
-// section group. If GROUP is false, this is a group signature
-// derived from the name of a linkonce section. We want linkonce
-// signatures and group signatures to block each other, but we don't
-// want a linkonce signature to block another linkonce signature.
+ // Set the file offsets of all the non-data sections which don't
+ // have to wait for the input sections.
+ off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS);
-bool
-Layout::add_comdat(const char* signature, bool group)
-{
- std::string sig(signature);
- std::pair<Signatures::iterator, bool> ins(
- this->signatures_.insert(std::make_pair(signature, group)));
+ // Now that all sections have been created, set the section indexes.
+ shndx = this->set_section_indexes(shndx);
- if (ins.second)
- {
+ // Create the section table header.
+ this->create_shdrs(&off);
+
+ file_header->set_section_info(this->section_headers_, shstrtab_section);
+
+ // Now we know exactly where everything goes in the output file
+ // (except for non-allocated sections which require postprocessing).
+ Output_data::layout_complete();
+
+ this->output_file_size_ = off;
+
+ return off;
+}
+
+// Create a .note section for an executable or shared library. This
+// records the version of gold used to create the binary.
+
+void
+Layout::create_gold_note()
+{
+ if (parameters->output_is_object())
+ return;
+
+ // Authorities all agree that the values in a .note field should
+ // be aligned on 4-byte boundaries for 32-bit binaries. However,
+ // they differ on what the alignment is for 64-bit binaries.
+ // The GABI says unambiguously they take 8-byte alignment:
+ // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section
+ // Other documentation says alignment should always be 4 bytes:
+ // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format
+ // GNU ld and GNU readelf both support the latter (at least as of
+ // version 2.16.91), and glibc always generates the latter for
+ // .note.ABI-tag (as of version 1.6), so that's the one we go with
+ // here.
+#ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default.
+ const int size = parameters->get_size();
+#else
+ const int size = 32;
+#endif
+
+ // The contents of the .note section.
+ const char* name = "GNU";
+ std::string desc(std::string("gold ") + gold::get_version_string());
+ size_t namesz = strlen(name) + 1;
+ size_t aligned_namesz = align_address(namesz, size / 8);
+ size_t descsz = desc.length() + 1;
+ size_t aligned_descsz = align_address(descsz, size / 8);
+ const int note_type = 4;
+
+ size_t notesz = 3 * (size / 8) + aligned_namesz + aligned_descsz;
+
+ unsigned char buffer[128];
+ gold_assert(sizeof buffer >= notesz);
+ memset(buffer, 0, notesz);
+
+ bool is_big_endian = parameters->is_big_endian();
+
+ if (size == 32)
+ {
+ if (!is_big_endian)
+ {
+ elfcpp::Swap<32, false>::writeval(buffer, namesz);
+ elfcpp::Swap<32, false>::writeval(buffer + 4, descsz);
+ elfcpp::Swap<32, false>::writeval(buffer + 8, note_type);
+ }
+ else
+ {
+ elfcpp::Swap<32, true>::writeval(buffer, namesz);
+ elfcpp::Swap<32, true>::writeval(buffer + 4, descsz);
+ elfcpp::Swap<32, true>::writeval(buffer + 8, note_type);
+ }
+ }
+ else if (size == 64)
+ {
+ if (!is_big_endian)
+ {
+ elfcpp::Swap<64, false>::writeval(buffer, namesz);
+ elfcpp::Swap<64, false>::writeval(buffer + 8, descsz);
+ elfcpp::Swap<64, false>::writeval(buffer + 16, note_type);
+ }
+ else
+ {
+ elfcpp::Swap<64, true>::writeval(buffer, namesz);
+ elfcpp::Swap<64, true>::writeval(buffer + 8, descsz);
+ elfcpp::Swap<64, true>::writeval(buffer + 16, note_type);
+ }
+ }
+ else
+ gold_unreachable();
+
+ memcpy(buffer + 3 * (size / 8), name, namesz);
+ memcpy(buffer + 3 * (size / 8) + aligned_namesz, desc.data(), descsz);
+
+ const char* note_name = this->namepool_.add(".note", false, NULL);
+ Output_section* os = this->make_output_section(note_name,
+ elfcpp::SHT_NOTE,
+ 0);
+ Output_section_data* posd = new Output_data_const(buffer, notesz,
+ size / 8);
+ os->add_output_section_data(posd);
+}
+
+// Record whether the stack should be executable. This can be set
+// from the command line using the -z execstack or -z noexecstack
+// options. Otherwise, if any input file has a .note.GNU-stack
+// section with the SHF_EXECINSTR flag set, the stack should be
+// executable. Otherwise, if at least one input file a
+// .note.GNU-stack section, and some input file has no .note.GNU-stack
+// section, we use the target default for whether the stack should be
+// executable. Otherwise, we don't generate a stack note. When
+// generating a object file, we create a .note.GNU-stack section with
+// the appropriate marking. When generating an executable or shared
+// library, we create a PT_GNU_STACK segment.
+
+void
+Layout::create_executable_stack_info(const Target* target)
+{
+ bool is_stack_executable;
+ if (this->options_.is_execstack_set())
+ is_stack_executable = this->options_.is_stack_executable();
+ else if (!this->input_with_gnu_stack_note_)
+ return;
+ else
+ {
+ if (this->input_requires_executable_stack_)
+ is_stack_executable = true;
+ else if (this->input_without_gnu_stack_note_)
+ is_stack_executable = target->is_default_stack_executable();
+ else
+ is_stack_executable = false;
+ }
+
+ if (parameters->output_is_object())
+ {
+ const char* name = this->namepool_.add(".note.GNU-stack", false, NULL);
+ elfcpp::Elf_Xword flags = 0;
+ if (is_stack_executable)
+ flags |= elfcpp::SHF_EXECINSTR;
+ this->make_output_section(name, elfcpp::SHT_PROGBITS, flags);
+ }
+ else
+ {
+ int flags = elfcpp::PF_R | elfcpp::PF_W;
+ if (is_stack_executable)
+ flags |= elfcpp::PF_X;
+ Output_segment* oseg = new Output_segment(elfcpp::PT_GNU_STACK, flags);
+ this->segment_list_.push_back(oseg);
+ }
+}
+
+// Return whether SEG1 should be before SEG2 in the output file. This
+// is based entirely on the segment type and flags. When this is
+// called the segment addresses has normally not yet been set.
+
+bool
+Layout::segment_precedes(const Output_segment* seg1,
+ const Output_segment* seg2)
+{
+ elfcpp::Elf_Word type1 = seg1->type();
+ elfcpp::Elf_Word type2 = seg2->type();
+
+ // The single PT_PHDR segment is required to precede any loadable
+ // segment. We simply make it always first.
+ if (type1 == elfcpp::PT_PHDR)
+ {
+ gold_assert(type2 != elfcpp::PT_PHDR);
+ return true;
+ }
+ if (type2 == elfcpp::PT_PHDR)
+ return false;
+
+ // The single PT_INTERP segment is required to precede any loadable
+ // segment. We simply make it always second.
+ if (type1 == elfcpp::PT_INTERP)
+ {
+ gold_assert(type2 != elfcpp::PT_INTERP);
+ return true;
+ }
+ if (type2 == elfcpp::PT_INTERP)
+ return false;
+
+ // We then put PT_LOAD segments before any other segments.
+ if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD)
+ return true;
+ if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD)
+ return false;
+
+ // We put the PT_TLS segment last, because that is where the dynamic
+ // linker expects to find it (this is just for efficiency; other
+ // positions would also work correctly).
+ if (type1 == elfcpp::PT_TLS && type2 != elfcpp::PT_TLS)
+ return false;
+ if (type2 == elfcpp::PT_TLS && type1 != elfcpp::PT_TLS)
+ return true;
+
+ const elfcpp::Elf_Word flags1 = seg1->flags();
+ const elfcpp::Elf_Word flags2 = seg2->flags();
+
+ // The order of non-PT_LOAD segments is unimportant. We simply sort
+ // by the numeric segment type and flags values. There should not
+ // be more than one segment with the same type and flags.
+ if (type1 != elfcpp::PT_LOAD)
+ {
+ if (type1 != type2)
+ return type1 < type2;
+ gold_assert(flags1 != flags2);
+ return flags1 < flags2;
+ }
+
+ // We sort PT_LOAD segments based on the flags. Readonly segments
+ // come before writable segments. Then executable segments come
+ // before non-executable segments. Then the unlikely case of a
+ // non-readable segment comes before the normal case of a readable
+ // segment. If there are multiple segments with the same type and
+ // flags, we require that the address be set, and we sort by
+ // virtual address and then physical address.
+ if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W))
+ return (flags1 & elfcpp::PF_W) == 0;
+ if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X))
+ return (flags1 & elfcpp::PF_X) != 0;
+ if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R))
+ return (flags1 & elfcpp::PF_R) == 0;
+
+ uint64_t vaddr1 = seg1->vaddr();
+ uint64_t vaddr2 = seg2->vaddr();
+ if (vaddr1 != vaddr2)
+ return vaddr1 < vaddr2;
+
+ uint64_t paddr1 = seg1->paddr();
+ uint64_t paddr2 = seg2->paddr();
+ gold_assert(paddr1 != paddr2);
+ return paddr1 < paddr2;
+}
+
+// Set the file offsets of all the segments, and all the sections they
+// contain. They have all been created. LOAD_SEG must be be laid out
+// first. Return the offset of the data to follow.
+
+off_t
+Layout::set_segment_offsets(const Target* target, Output_segment* load_seg,
+ unsigned int *pshndx)
+{
+ // Sort them into the final order.
+ std::sort(this->segment_list_.begin(), this->segment_list_.end(),
+ Layout::Compare_segments());
+
+ // Find the PT_LOAD segments, and set their addresses and offsets
+ // and their section's addresses and offsets.
+ uint64_t addr;
+ if (options_.user_set_text_segment_address())
+ addr = options_.text_segment_address();
+ else
+ addr = target->default_text_segment_address();
+ off_t off = 0;
+ bool was_readonly = false;
+ for (Segment_list::iterator p = this->segment_list_.begin();
+ p != this->segment_list_.end();
+ ++p)
+ {
+ if ((*p)->type() == elfcpp::PT_LOAD)
+ {
+ if (load_seg != NULL && load_seg != *p)
+ gold_unreachable();
+ load_seg = NULL;
+
+ // If the last segment was readonly, and this one is not,
+ // then skip the address forward one page, maintaining the
+ // same position within the page. This lets us store both
+ // segments overlapping on a single page in the file, but
+ // the loader will put them on different pages in memory.
+
+ uint64_t orig_addr = addr;
+ uint64_t orig_off = off;
+
+ uint64_t aligned_addr = addr;
+ uint64_t abi_pagesize = target->abi_pagesize();
+
+ // FIXME: This should depend on the -n and -N options.
+ (*p)->set_minimum_addralign(target->common_pagesize());
+
+ if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0)
+ {
+ uint64_t align = (*p)->addralign();
+
+ addr = align_address(addr, align);
+ aligned_addr = addr;
+ if ((addr & (abi_pagesize - 1)) != 0)
+ addr = addr + abi_pagesize;
+ }
+
+ unsigned int shndx_hold = *pshndx;
+ off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1));
+ uint64_t new_addr = (*p)->set_section_addresses(addr, &off, pshndx);
+
+ // Now that we know the size of this segment, we may be able
+ // to save a page in memory, at the cost of wasting some
+ // file space, by instead aligning to the start of a new
+ // page. Here we use the real machine page size rather than
+ // the ABI mandated page size.
+
+ if (aligned_addr != addr)
+ {
+ uint64_t common_pagesize = target->common_pagesize();
+ uint64_t first_off = (common_pagesize
+ - (aligned_addr
+ & (common_pagesize - 1)));
+ uint64_t last_off = new_addr & (common_pagesize - 1);
+ if (first_off > 0
+ && last_off > 0
+ && ((aligned_addr & ~ (common_pagesize - 1))
+ != (new_addr & ~ (common_pagesize - 1)))
+ && first_off + last_off <= common_pagesize)
+ {
+ *pshndx = shndx_hold;
+ addr = align_address(aligned_addr, common_pagesize);
+ off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1));
+ new_addr = (*p)->set_section_addresses(addr, &off, pshndx);
+ }
+ }
+
+ addr = new_addr;
+
+ if (((*p)->flags() & elfcpp::PF_W) == 0)
+ was_readonly = true;
+ }
+ }
+
+ // Handle the non-PT_LOAD segments, setting their offsets from their
+ // section's offsets.
+ for (Segment_list::iterator p = this->segment_list_.begin();
+ p != this->segment_list_.end();
+ ++p)
+ {
+ if ((*p)->type() != elfcpp::PT_LOAD)
+ (*p)->set_offset();
+ }
+
+ return off;
+}
+
+// Set the file offset of all the sections not associated with a
+// segment.
+
+off_t
+Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass)
+{
+ for (Section_list::iterator p = this->unattached_section_list_.begin();
+ p != this->unattached_section_list_.end();
+ ++p)
+ {
+ // The symtab section is handled in create_symtab_sections.
+ if (*p == this->symtab_section_)
+ continue;
+
+ if (pass == BEFORE_INPUT_SECTIONS_PASS
+ && (*p)->after_input_sections())
+ continue;
+ else if (pass == AFTER_INPUT_SECTIONS_PASS
+ && (!(*p)->after_input_sections()
+ || (*p)->type() == elfcpp::SHT_STRTAB))
+ continue;
+ else if (pass == STRTAB_AFTER_INPUT_SECTIONS_PASS
+ && (!(*p)->after_input_sections()
+ || (*p)->type() != elfcpp::SHT_STRTAB))
+ continue;
+
+ off = align_address(off, (*p)->addralign());
+ (*p)->set_file_offset(off);
+ (*p)->finalize_data_size();
+ off += (*p)->data_size();
+ }
+ return off;
+}
+
+// Allow any section not associated with a segment to change its
+// output section name at the last minute.
+
+void
+Layout::modify_section_names()
+{
+ for (Section_list::iterator p = this->unattached_section_list_.begin();
+ p != this->unattached_section_list_.end();
+ ++p)
+ if ((*p)->maybe_modify_output_section_name())
+ this->namepool_.add((*p)->name(), true, NULL);
+}
+
+// Set the section indexes of all the sections not associated with a
+// segment.
+
+unsigned int
+Layout::set_section_indexes(unsigned int shndx)
+{
+ for (Section_list::iterator p = this->unattached_section_list_.begin();
+ p != this->unattached_section_list_.end();
+ ++p)
+ {
+ (*p)->set_out_shndx(shndx);
+ ++shndx;
+ }
+ return shndx;
+}
+
+// Create the symbol table sections. Here we also set the final
+// values of the symbols. At this point all the loadable sections are
+// fully laid out.
+
+void
+Layout::create_symtab_sections(const Input_objects* input_objects,
+ Symbol_table* symtab,
+ off_t* poff)
+{
+ int symsize;
+ unsigned int align;
+ if (parameters->get_size() == 32)
+ {
+ symsize = elfcpp::Elf_sizes<32>::sym_size;
+ align = 4;
+ }
+ else if (parameters->get_size() == 64)
+ {
+ symsize = elfcpp::Elf_sizes<64>::sym_size;
+ align = 8;
+ }
+ else
+ gold_unreachable();
+
+ off_t off = *poff;
+ off = align_address(off, align);
+ off_t startoff = off;
+
+ // Save space for the dummy symbol at the start of the section. We
+ // never bother to write this out--it will just be left as zero.
+ off += symsize;
+ unsigned int local_symbol_index = 1;
+
+ // Add STT_SECTION symbols for each Output section which needs one.
+ for (Section_list::iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ if (!(*p)->needs_symtab_index())
+ (*p)->set_symtab_index(-1U);
+ else
+ {
+ (*p)->set_symtab_index(local_symbol_index);
+ ++local_symbol_index;
+ off += symsize;
+ }
+ }
+
+ for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
+ p != input_objects->relobj_end();
+ ++p)
+ {
+ Task_lock_obj<Object> tlo(**p);
+ unsigned int index = (*p)->finalize_local_symbols(local_symbol_index,
+ off,
+ &this->sympool_);
+ off += (index - local_symbol_index) * symsize;
+ local_symbol_index = index;
+ }
+
+ unsigned int local_symcount = local_symbol_index;
+ gold_assert(local_symcount * symsize == off - startoff);
+
+ off_t dynoff;
+ size_t dyn_global_index;
+ size_t dyncount;
+ if (this->dynsym_section_ == NULL)
+ {
+ dynoff = 0;
+ dyn_global_index = 0;
+ dyncount = 0;
+ }
+ else
+ {
+ dyn_global_index = this->dynsym_section_->info();
+ off_t locsize = dyn_global_index * this->dynsym_section_->entsize();
+ dynoff = this->dynsym_section_->offset() + locsize;
+ dyncount = (this->dynsym_section_->data_size() - locsize) / symsize;
+ gold_assert(static_cast<off_t>(dyncount * symsize)
+ == this->dynsym_section_->data_size() - locsize);
+ }
+
+ off = symtab->finalize(local_symcount, off, dynoff, dyn_global_index,
+ dyncount, &this->sympool_);
+
+ if (!parameters->strip_all())
+ {
+ this->sympool_.set_string_offsets();
+
+ const char* symtab_name = this->namepool_.add(".symtab", false, NULL);
+ Output_section* osymtab = this->make_output_section(symtab_name,
+ elfcpp::SHT_SYMTAB,
+ 0);
+ this->symtab_section_ = osymtab;
+
+ Output_section_data* pos = new Output_data_fixed_space(off - startoff,
+ align);
+ osymtab->add_output_section_data(pos);
+
+ const char* strtab_name = this->namepool_.add(".strtab", false, NULL);
+ Output_section* ostrtab = this->make_output_section(strtab_name,
+ elfcpp::SHT_STRTAB,
+ 0);
+
+ Output_section_data* pstr = new Output_data_strtab(&this->sympool_);
+ ostrtab->add_output_section_data(pstr);
+
+ osymtab->set_file_offset(startoff);
+ osymtab->finalize_data_size();
+ osymtab->set_link_section(ostrtab);
+ osymtab->set_info(local_symcount);
+ osymtab->set_entsize(symsize);
+
+ *poff = off;
+ }
+}
+
+// Create the .shstrtab section, which holds the names of the
+// sections. At the time this is called, we have created all the
+// output sections except .shstrtab itself.
+
+Output_section*
+Layout::create_shstrtab()
+{
+ // FIXME: We don't need to create a .shstrtab section if we are
+ // stripping everything.
+
+ const char* name = this->namepool_.add(".shstrtab", false, NULL);
+
+ Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0);
+
+ // We can't write out this section until we've set all the section
+ // names, and we don't set the names of compressed output sections
+ // until relocations are complete.
+ os->set_after_input_sections();
+
+ Output_section_data* posd = new Output_data_strtab(&this->namepool_);
+ os->add_output_section_data(posd);
+
+ return os;
+}
+
+// Create the section headers. SIZE is 32 or 64. OFF is the file
+// offset.
+
+void
+Layout::create_shdrs(off_t* poff)
+{
+ Output_section_headers* oshdrs;
+ oshdrs = new Output_section_headers(this,
+ &this->segment_list_,
+ &this->unattached_section_list_,
+ &this->namepool_);
+ off_t off = align_address(*poff, oshdrs->addralign());
+ oshdrs->set_address_and_file_offset(0, off);
+ off += oshdrs->data_size();
+ *poff = off;
+ this->section_headers_ = oshdrs;
+}
+
+// Create the dynamic symbol table.
+
+void
+Layout::create_dynamic_symtab(const Target* target, Symbol_table* symtab,
+ Output_section **pdynstr,
+ unsigned int* plocal_dynamic_count,
+ std::vector<Symbol*>* pdynamic_symbols,
+ Versions* pversions)
+{
+ // Count all the symbols in the dynamic symbol table, and set the
+ // dynamic symbol indexes.
+
+ // Skip symbol 0, which is always all zeroes.
+ unsigned int index = 1;
+
+ // Add STT_SECTION symbols for each Output section which needs one.
+ for (Section_list::iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ if (!(*p)->needs_dynsym_index())
+ (*p)->set_dynsym_index(-1U);
+ else
+ {
+ (*p)->set_dynsym_index(index);
+ ++index;
+ }
+ }
+
+ // FIXME: Some targets apparently require local symbols in the
+ // dynamic symbol table. Here is where we will have to count them,
+ // and set the dynamic symbol indexes, and add the names to
+ // this->dynpool_.
+
+ unsigned int local_symcount = index;
+ *plocal_dynamic_count = local_symcount;
+
+ // FIXME: We have to tell set_dynsym_indexes whether the
+ // -E/--export-dynamic option was used.
+ index = symtab->set_dynsym_indexes(target, index, pdynamic_symbols,
+ &this->dynpool_, pversions);
+
+ int symsize;
+ unsigned int align;
+ const int size = parameters->get_size();
+ if (size == 32)
+ {
+ symsize = elfcpp::Elf_sizes<32>::sym_size;
+ align = 4;
+ }
+ else if (size == 64)
+ {
+ symsize = elfcpp::Elf_sizes<64>::sym_size;
+ align = 8;
+ }
+ else
+ gold_unreachable();
+
+ // Create the dynamic symbol table section.
+
+ const char* dynsym_name = this->namepool_.add(".dynsym", false, NULL);
+ Output_section* dynsym = this->make_output_section(dynsym_name,
+ elfcpp::SHT_DYNSYM,
+ elfcpp::SHF_ALLOC);
+
+ Output_section_data* odata = new Output_data_fixed_space(index * symsize,
+ align);
+ dynsym->add_output_section_data(odata);
+
+ dynsym->set_info(local_symcount);
+ dynsym->set_entsize(symsize);
+ dynsym->set_addralign(align);
+
+ this->dynsym_section_ = dynsym;
+
+ Output_data_dynamic* const odyn = this->dynamic_data_;
+ odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym);
+ odyn->add_constant(elfcpp::DT_SYMENT, symsize);
+
+ // Create the dynamic string table section.
+
+ const char* dynstr_name = this->namepool_.add(".dynstr", false, NULL);
+ Output_section* dynstr = this->make_output_section(dynstr_name,
+ elfcpp::SHT_STRTAB,
+ elfcpp::SHF_ALLOC);
+
+ Output_section_data* strdata = new Output_data_strtab(&this->dynpool_);
+ dynstr->add_output_section_data(strdata);
+
+ dynsym->set_link_section(dynstr);
+ this->dynamic_section_->set_link_section(dynstr);
+
+ odyn->add_section_address(elfcpp::DT_STRTAB, dynstr);
+ odyn->add_section_size(elfcpp::DT_STRSZ, dynstr);
+
+ *pdynstr = dynstr;
+
+ // Create the hash tables.
+
+ // FIXME: We need an option to create a GNU hash table.
+
+ unsigned char* phash;
+ unsigned int hashlen;
+ Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount,
+ &phash, &hashlen);
+
+ const char* hash_name = this->namepool_.add(".hash", false, NULL);
+ Output_section* hashsec = this->make_output_section(hash_name,
+ elfcpp::SHT_HASH,
+ elfcpp::SHF_ALLOC);
+
+ Output_section_data* hashdata = new Output_data_const_buffer(phash,
+ hashlen,
+ align);
+ hashsec->add_output_section_data(hashdata);
+
+ hashsec->set_link_section(dynsym);
+ hashsec->set_entsize(4);
+
+ odyn->add_section_address(elfcpp::DT_HASH, hashsec);
+}
+
+// Create the version sections.
+
+void
+Layout::create_version_sections(const Versions* versions,
+ const Symbol_table* symtab,
+ unsigned int local_symcount,
+ const std::vector<Symbol*>& dynamic_symbols,
+ const Output_section* dynstr)
+{
+ if (!versions->any_defs() && !versions->any_needs())
+ return;
+
+ if (parameters->get_size() == 32)
+ {
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ this->sized_create_version_sections
+ SELECT_SIZE_ENDIAN_NAME(32, true)(
+ versions, symtab, local_symcount, dynamic_symbols, dynstr
+ SELECT_SIZE_ENDIAN(32, true));
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ this->sized_create_version_sections
+ SELECT_SIZE_ENDIAN_NAME(32, false)(
+ versions, symtab, local_symcount, dynamic_symbols, dynstr
+ SELECT_SIZE_ENDIAN(32, false));
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else if (parameters->get_size() == 64)
+ {
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ this->sized_create_version_sections
+ SELECT_SIZE_ENDIAN_NAME(64, true)(
+ versions, symtab, local_symcount, dynamic_symbols, dynstr
+ SELECT_SIZE_ENDIAN(64, true));
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->sized_create_version_sections
+ SELECT_SIZE_ENDIAN_NAME(64, false)(
+ versions, symtab, local_symcount, dynamic_symbols, dynstr
+ SELECT_SIZE_ENDIAN(64, false));
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else
+ gold_unreachable();
+}
+
+// Create the version sections, sized version.
+
+template<int size, bool big_endian>
+void
+Layout::sized_create_version_sections(
+ const Versions* versions,
+ const Symbol_table* symtab,
+ unsigned int local_symcount,
+ const std::vector<Symbol*>& dynamic_symbols,
+ const Output_section* dynstr
+ ACCEPT_SIZE_ENDIAN)
+{
+ const char* vname = this->namepool_.add(".gnu.version", false, NULL);
+ Output_section* vsec = this->make_output_section(vname,
+ elfcpp::SHT_GNU_versym,
+ elfcpp::SHF_ALLOC);
+
+ unsigned char* vbuf;
+ unsigned int vsize;
+ versions->symbol_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian)(
+ symtab, &this->dynpool_, local_symcount, dynamic_symbols, &vbuf, &vsize
+ SELECT_SIZE_ENDIAN(size, big_endian));
+
+ Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2);
+
+ vsec->add_output_section_data(vdata);
+ vsec->set_entsize(2);
+ vsec->set_link_section(this->dynsym_section_);
+
+ Output_data_dynamic* const odyn = this->dynamic_data_;
+ odyn->add_section_address(elfcpp::DT_VERSYM, vsec);
+
+ if (versions->any_defs())
+ {
+ const char* vdname = this->namepool_.add(".gnu.version_d", false, NULL);
+ Output_section *vdsec;
+ vdsec = this->make_output_section(vdname, elfcpp::SHT_GNU_verdef,
+ elfcpp::SHF_ALLOC);
+
+ unsigned char* vdbuf;
+ unsigned int vdsize;
+ unsigned int vdentries;
+ versions->def_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian)(
+ &this->dynpool_, &vdbuf, &vdsize, &vdentries
+ SELECT_SIZE_ENDIAN(size, big_endian));
+
+ Output_section_data* vddata = new Output_data_const_buffer(vdbuf,
+ vdsize,
+ 4);
+
+ vdsec->add_output_section_data(vddata);
+ vdsec->set_link_section(dynstr);
+ vdsec->set_info(vdentries);
+
+ odyn->add_section_address(elfcpp::DT_VERDEF, vdsec);
+ odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries);
+ }
+
+ if (versions->any_needs())
+ {
+ const char* vnname = this->namepool_.add(".gnu.version_r", false, NULL);
+ Output_section* vnsec;
+ vnsec = this->make_output_section(vnname, elfcpp::SHT_GNU_verneed,
+ elfcpp::SHF_ALLOC);
+
+ unsigned char* vnbuf;
+ unsigned int vnsize;
+ unsigned int vnentries;
+ versions->need_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian)
+ (&this->dynpool_, &vnbuf, &vnsize, &vnentries
+ SELECT_SIZE_ENDIAN(size, big_endian));
+
+ Output_section_data* vndata = new Output_data_const_buffer(vnbuf,
+ vnsize,
+ 4);
+
+ vnsec->add_output_section_data(vndata);
+ vnsec->set_link_section(dynstr);
+ vnsec->set_info(vnentries);
+
+ odyn->add_section_address(elfcpp::DT_VERNEED, vnsec);
+ odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries);
+ }
+}
+
+// Create the .interp section and PT_INTERP segment.
+
+void
+Layout::create_interp(const Target* target)
+{
+ const char* interp = this->options_.dynamic_linker();
+ if (interp == NULL)
+ {
+ interp = target->dynamic_linker();
+ gold_assert(interp != NULL);
+ }
+
+ size_t len = strlen(interp) + 1;
+
+ Output_section_data* odata = new Output_data_const(interp, len, 1);
+
+ const char* interp_name = this->namepool_.add(".interp", false, NULL);
+ Output_section* osec = this->make_output_section(interp_name,
+ elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC);
+ osec->add_output_section_data(odata);
+
+ Output_segment* oseg = new Output_segment(elfcpp::PT_INTERP, elfcpp::PF_R);
+ this->segment_list_.push_back(oseg);
+ oseg->add_initial_output_section(osec, elfcpp::PF_R);
+}
+
+// Finish the .dynamic section and PT_DYNAMIC segment.
+
+void
+Layout::finish_dynamic_section(const Input_objects* input_objects,
+ const Symbol_table* symtab)
+{
+ Output_segment* oseg = new Output_segment(elfcpp::PT_DYNAMIC,
+ elfcpp::PF_R | elfcpp::PF_W);
+ this->segment_list_.push_back(oseg);
+ oseg->add_initial_output_section(this->dynamic_section_,
+ elfcpp::PF_R | elfcpp::PF_W);
+
+ Output_data_dynamic* const odyn = this->dynamic_data_;
+
+ for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin();
+ p != input_objects->dynobj_end();
+ ++p)
+ {
+ // FIXME: Handle --as-needed.
+ odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname());
+ }
+
+ // FIXME: Support --init and --fini.
+ Symbol* sym = symtab->lookup("_init");
+ if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj())
+ odyn->add_symbol(elfcpp::DT_INIT, sym);
+
+ sym = symtab->lookup("_fini");
+ if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj())
+ odyn->add_symbol(elfcpp::DT_FINI, sym);
+
+ // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY.
+
+ // Add a DT_RPATH entry if needed.
+ const General_options::Dir_list& rpath(this->options_.rpath());
+ if (!rpath.empty())
+ {
+ std::string rpath_val;
+ for (General_options::Dir_list::const_iterator p = rpath.begin();
+ p != rpath.end();
+ ++p)
+ {
+ if (rpath_val.empty())
+ rpath_val = p->name();
+ else
+ {
+ // Eliminate duplicates.
+ General_options::Dir_list::const_iterator q;
+ for (q = rpath.begin(); q != p; ++q)
+ if (q->name() == p->name())
+ break;
+ if (q == p)
+ {
+ rpath_val += ':';
+ rpath_val += p->name();
+ }
+ }
+ }
+
+ odyn->add_string(elfcpp::DT_RPATH, rpath_val);
+ }
+
+ // Look for text segments that have dynamic relocations.
+ bool have_textrel = false;
+ for (Segment_list::const_iterator p = this->segment_list_.begin();
+ p != this->segment_list_.end();
+ ++p)
+ {
+ if (((*p)->flags() & elfcpp::PF_W) == 0
+ && (*p)->dynamic_reloc_count() > 0)
+ {
+ have_textrel = true;
+ break;
+ }
+ }
+
+ // Add a DT_FLAGS entry. We add it even if no flags are set so that
+ // post-link tools can easily modify these flags if desired.
+ unsigned int flags = 0;
+ if (have_textrel)
+ flags |= elfcpp::DF_TEXTREL;
+ odyn->add_constant(elfcpp::DT_FLAGS, flags);
+}
+
+// The mapping of .gnu.linkonce section names to real section names.
+
+#define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 }
+const Layout::Linkonce_mapping Layout::linkonce_mapping[] =
+{
+ MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d".
+ MAPPING_INIT("t", ".text"),
+ MAPPING_INIT("r", ".rodata"),
+ MAPPING_INIT("d", ".data"),
+ MAPPING_INIT("b", ".bss"),
+ MAPPING_INIT("s", ".sdata"),
+ MAPPING_INIT("sb", ".sbss"),
+ MAPPING_INIT("s2", ".sdata2"),
+ MAPPING_INIT("sb2", ".sbss2"),
+ MAPPING_INIT("wi", ".debug_info"),
+ MAPPING_INIT("td", ".tdata"),
+ MAPPING_INIT("tb", ".tbss"),
+ MAPPING_INIT("lr", ".lrodata"),
+ MAPPING_INIT("l", ".ldata"),
+ MAPPING_INIT("lb", ".lbss"),
+};
+#undef MAPPING_INIT
+
+const int Layout::linkonce_mapping_count =
+ sizeof(Layout::linkonce_mapping) / sizeof(Layout::linkonce_mapping[0]);
+
+// Return the name of the output section to use for a .gnu.linkonce
+// section. This is based on the default ELF linker script of the old
+// GNU linker. For example, we map a name like ".gnu.linkonce.t.foo"
+// to ".text". Set *PLEN to the length of the name. *PLEN is
+// initialized to the length of NAME.
+
+const char*
+Layout::linkonce_output_name(const char* name, size_t *plen)
+{
+ const char* s = name + sizeof(".gnu.linkonce") - 1;
+ if (*s != '.')
+ return name;
+ ++s;
+ const Linkonce_mapping* plm = linkonce_mapping;
+ for (int i = 0; i < linkonce_mapping_count; ++i, ++plm)
+ {
+ if (strncmp(s, plm->from, plm->fromlen) == 0 && s[plm->fromlen] == '.')
+ {
+ *plen = plm->tolen;
+ return plm->to;
+ }
+ }
+ return name;
+}
+
+// Choose the output section name to use given an input section name.
+// Set *PLEN to the length of the name. *PLEN is initialized to the
+// length of NAME.
+
+const char*
+Layout::output_section_name(const char* name, size_t* plen)
+{
+ if (Layout::is_linkonce(name))
+ {
+ // .gnu.linkonce sections are laid out as though they were named
+ // for the sections are placed into.
+ return Layout::linkonce_output_name(name, plen);
+ }
+
+ // gcc 4.3 generates the following sorts of section names when it
+ // needs a section name specific to a function:
+ // .text.FN
+ // .rodata.FN
+ // .sdata2.FN
+ // .data.FN
+ // .data.rel.FN
+ // .data.rel.local.FN
+ // .data.rel.ro.FN
+ // .data.rel.ro.local.FN
+ // .sdata.FN
+ // .bss.FN
+ // .sbss.FN
+ // .tdata.FN
+ // .tbss.FN
+
+ // The GNU linker maps all of those to the part before the .FN,
+ // except that .data.rel.local.FN is mapped to .data, and
+ // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections
+ // beginning with .data.rel.ro.local are grouped together.
+
+ // For an anonymous namespace, the string FN can contain a '.'.
+
+ // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the
+ // GNU linker maps to .rodata.
+
+ // The .data.rel.ro sections enable a security feature triggered by
+ // the -z relro option. Section which need to be relocated at
+ // program startup time but which may be readonly after startup are
+ // grouped into .data.rel.ro. They are then put into a PT_GNU_RELRO
+ // segment. The dynamic linker will make that segment writable,
+ // perform relocations, and then make it read-only. FIXME: We do
+ // not yet implement this optimization.
+
+ // It is hard to handle this in a principled way.
+
+ // These are the rules we follow:
+
+ // If the section name has no initial '.', or no dot other than an
+ // initial '.', we use the name unchanged (i.e., "mysection" and
+ // ".text" are unchanged).
+
+ // If the name starts with ".data.rel.ro" we use ".data.rel.ro".
+
+ // Otherwise, we drop the second '.' and everything that comes after
+ // it (i.e., ".text.XXX" becomes ".text").
+
+ const char* s = name;
+ if (*s != '.')
+ return name;
+ ++s;
+ const char* sdot = strchr(s, '.');
+ if (sdot == NULL)
+ return name;
+
+ const char* const data_rel_ro = ".data.rel.ro";
+ if (strncmp(name, data_rel_ro, strlen(data_rel_ro)) == 0)
+ {
+ *plen = strlen(data_rel_ro);
+ return data_rel_ro;
+ }
+
+ *plen = sdot - name;
+ return name;
+}
+
+// Record the signature of a comdat section, and return whether to
+// include it in the link. If GROUP is true, this is a regular
+// section group. If GROUP is false, this is a group signature
+// derived from the name of a linkonce section. We want linkonce
+// signatures and group signatures to block each other, but we don't
+// want a linkonce signature to block another linkonce signature.
+
+bool
+Layout::add_comdat(const char* signature, bool group)
+{
+ std::string sig(signature);
+ std::pair<Signatures::iterator, bool> ins(
+ this->signatures_.insert(std::make_pair(sig, group)));
+
+ if (ins.second)
+ {
// This is the first time we've seen this signature.
return true;
}
else if (group)
{
// This is a real section group, and we've already seen a
- // linkonce section with tihs signature. Record that we've seen
+ // linkonce section with this signature. Record that we've seen
// a section group, and don't include this section group.
ins.first->second = true;
return false;
}
}
+// Write out the Output_sections. Most won't have anything to write,
+// since most of the data will come from input sections which are
+// handled elsewhere. But some Output_sections do have Output_data.
+
+void
+Layout::write_output_sections(Output_file* of) const
+{
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ if (!(*p)->after_input_sections())
+ (*p)->write(of);
+ }
+}
+
+// Write out data not associated with a section or the symbol table.
+
+void
+Layout::write_data(const Symbol_table* symtab, Output_file* of) const
+{
+ if (!parameters->strip_all())
+ {
+ const Output_section* symtab_section = this->symtab_section_;
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ if ((*p)->needs_symtab_index())
+ {
+ gold_assert(symtab_section != NULL);
+ unsigned int index = (*p)->symtab_index();
+ gold_assert(index > 0 && index != -1U);
+ off_t off = (symtab_section->offset()
+ + index * symtab_section->entsize());
+ symtab->write_section_symbol(*p, of, off);
+ }
+ }
+ }
+
+ const Output_section* dynsym_section = this->dynsym_section_;
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ if ((*p)->needs_dynsym_index())
+ {
+ gold_assert(dynsym_section != NULL);
+ unsigned int index = (*p)->dynsym_index();
+ gold_assert(index > 0 && index != -1U);
+ off_t off = (dynsym_section->offset()
+ + index * dynsym_section->entsize());
+ symtab->write_section_symbol(*p, of, off);
+ }
+ }
+
+ // Write out the Output_data which are not in an Output_section.
+ for (Data_list::const_iterator p = this->special_output_list_.begin();
+ p != this->special_output_list_.end();
+ ++p)
+ (*p)->write(of);
+}
+
+// Write out the Output_sections which can only be written after the
+// input sections are complete.
+
+void
+Layout::write_sections_after_input_sections(Output_file* of)
+{
+ // Determine the final section offsets, and thus the final output
+ // file size. Note we finalize the .shstrab last, to allow the
+ // after_input_section sections to modify their section-names before
+ // writing.
+ off_t off = this->output_file_size_;
+ off = this->set_section_offsets(off, AFTER_INPUT_SECTIONS_PASS);
+
+ // Determine the final section names as well (at least, for sections
+ // that we haven't written yet).
+ this->modify_section_names();
+
+ // Now that we've finalized the names, we can finalize the shstrab.
+ off = this->set_section_offsets(off, STRTAB_AFTER_INPUT_SECTIONS_PASS);
+
+ if (off > this->output_file_size_)
+ {
+ of->resize(off);
+ this->output_file_size_ = off;
+ }
+
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ if ((*p)->after_input_sections())
+ (*p)->write(of);
+ }
+
+ for (Section_list::const_iterator p = this->unattached_section_list_.begin();
+ p != this->unattached_section_list_.end();
+ ++p)
+ {
+ if ((*p)->after_input_sections())
+ (*p)->write(of);
+ }
+
+ this->section_headers_->write(of);
+}
+
+// Write_sections_task methods.
+
+// We can always run this task.
+
+Task::Is_runnable_type
+Write_sections_task::is_runnable(Workqueue*)
+{
+ return IS_RUNNABLE;
+}
+
+// We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER
+// when finished.
+
+class Write_sections_task::Write_sections_locker : public Task_locker
+{
+ public:
+ Write_sections_locker(Task_token& output_sections_blocker,
+ Task_token& final_blocker,
+ Workqueue* workqueue)
+ : output_sections_block_(output_sections_blocker, workqueue),
+ final_block_(final_blocker, workqueue)
+ { }
+
+ private:
+ Task_block_token output_sections_block_;
+ Task_block_token final_block_;
+};
+
+Task_locker*
+Write_sections_task::locks(Workqueue* workqueue)
+{
+ return new Write_sections_locker(*this->output_sections_blocker_,
+ *this->final_blocker_,
+ workqueue);
+}
+
+// Run the task--write out the data.
+
+void
+Write_sections_task::run(Workqueue*)
+{
+ this->layout_->write_output_sections(this->of_);
+}
+
+// Write_data_task methods.
+
+// We can always run this task.
+
+Task::Is_runnable_type
+Write_data_task::is_runnable(Workqueue*)
+{
+ return IS_RUNNABLE;
+}
+
+// We need to unlock FINAL_BLOCKER when finished.
+
+Task_locker*
+Write_data_task::locks(Workqueue* workqueue)
+{
+ return new Task_locker_block(*this->final_blocker_, workqueue);
+}
+
+// Run the task--write out the data.
+
+void
+Write_data_task::run(Workqueue*)
+{
+ this->layout_->write_data(this->symtab_, this->of_);
+}
+
+// Write_symbols_task methods.
+
+// We can always run this task.
+
+Task::Is_runnable_type
+Write_symbols_task::is_runnable(Workqueue*)
+{
+ return IS_RUNNABLE;
+}
+
+// We need to unlock FINAL_BLOCKER when finished.
+
+Task_locker*
+Write_symbols_task::locks(Workqueue* workqueue)
+{
+ return new Task_locker_block(*this->final_blocker_, workqueue);
+}
+
+// Run the task--write out the symbols.
+
+void
+Write_symbols_task::run(Workqueue*)
+{
+ this->symtab_->write_globals(this->input_objects_, this->sympool_,
+ this->dynpool_, this->of_);
+}
+
+// Write_after_input_sections_task methods.
+
+// We can only run this task after the input sections have completed.
+
+Task::Is_runnable_type
+Write_after_input_sections_task::is_runnable(Workqueue*)
+{
+ if (this->input_sections_blocker_->is_blocked())
+ return IS_BLOCKED;
+ return IS_RUNNABLE;
+}
+
+// We need to unlock FINAL_BLOCKER when finished.
+
+Task_locker*
+Write_after_input_sections_task::locks(Workqueue* workqueue)
+{
+ return new Task_locker_block(*this->final_blocker_, workqueue);
+}
+
+// Run the task.
+
+void
+Write_after_input_sections_task::run(Workqueue*)
+{
+ this->layout_->write_sections_after_input_sections(this->of_);
+}
+
+// Close_task_runner methods.
+
+// Run the task--close the file.
+
+void
+Close_task_runner::run(Workqueue*)
+{
+ this->of_->close();
+}
+
// 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
Output_section*
-Layout::layout<32, false>(Object* object, const char* name,
- const elfcpp::Shdr<32, false>& shdr, off_t*);
+Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx,
+ const char* name,
+ const elfcpp::Shdr<32, false>& shdr,
+ unsigned int, unsigned int, off_t*);
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
Output_section*
-Layout::layout<32, true>(Object* object, const char* name,
- const elfcpp::Shdr<32, true>& shdr, off_t*);
+Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx,
+ const char* name,
+ const elfcpp::Shdr<32, true>& shdr,
+ unsigned int, unsigned int, off_t*);
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
Output_section*
-Layout::layout<64, false>(Object* object, const char* name,
- const elfcpp::Shdr<64, false>& shdr, off_t*);
+Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx,
+ const char* name,
+ const elfcpp::Shdr<64, false>& shdr,
+ unsigned int, unsigned int, off_t*);
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
Output_section*
-Layout::layout<64, true>(Object* object, const char* name,
- const elfcpp::Shdr<64, true>& shdr, off_t*);
+Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx,
+ const char* name,
+ const elfcpp::Shdr<64, true>& shdr,
+ unsigned int, unsigned int, off_t*);
+#endif
+#ifdef HAVE_TARGET_32_LITTLE
+template
+Output_section*
+Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object,
+ const unsigned char* symbols,
+ off_t symbols_size,
+ const unsigned char* symbol_names,
+ off_t symbol_names_size,
+ unsigned int shndx,
+ const elfcpp::Shdr<32, false>& shdr,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type,
+ off_t* off);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+Output_section*
+Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object,
+ const unsigned char* symbols,
+ off_t symbols_size,
+ const unsigned char* symbol_names,
+ off_t symbol_names_size,
+ unsigned int shndx,
+ const elfcpp::Shdr<32, true>& shdr,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type,
+ off_t* off);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+Output_section*
+Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object,
+ const unsigned char* symbols,
+ off_t symbols_size,
+ const unsigned char* symbol_names,
+ off_t symbol_names_size,
+ unsigned int shndx,
+ const elfcpp::Shdr<64, false>& shdr,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type,
+ off_t* off);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+Output_section*
+Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object,
+ const unsigned char* symbols,
+ off_t symbols_size,
+ const unsigned char* symbol_names,
+ off_t symbol_names_size,
+ unsigned int shndx,
+ const elfcpp::Shdr<64, true>& shdr,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type,
+ off_t* off);
+#endif
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff