// layout.cc -- lay out output file sections for gold
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <utility>
#include "parameters.h"
+#include "options.h"
+#include "script.h"
+#include "script-sections.h"
#include "output.h"
#include "symtab.h"
#include "dynobj.h"
#include "ehframe.h"
#include "compressed_output.h"
+#include "reloc.h"
#include "layout.h"
namespace gold
// have been read.
void
-Layout_task_runner::run(Workqueue* workqueue)
+Layout_task_runner::run(Workqueue* workqueue, const Task* task)
{
off_t file_size = this->layout_->finalize(this->input_objects_,
- this->symtab_);
+ this->symtab_,
+ this->target_,
+ task);
// 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());
+ Output_file* of = new Output_file(parameters->options().output_file_name());
+ if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF)
+ of->set_is_temporary();
of->open(file_size);
// Queue up the final set of tasks.
// Layout methods.
-Layout::Layout(const General_options& options)
- : options_(options), namepool_(), sympool_(), dynpool_(), signatures_(),
+Layout::Layout(const General_options& options, Script_options* script_options)
+ : options_(options), script_options_(script_options), namepool_(),
+ sympool_(), dynpool_(), signatures_(),
section_name_map_(), segment_list_(), section_list_(),
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),
+ eh_frame_section_(NULL), group_signatures_(), output_file_size_(-1),
input_requires_executable_stack_(false),
input_with_gnu_stack_note_(false),
- input_without_gnu_stack_note_(false)
+ input_without_gnu_stack_note_(false),
+ has_static_tls_(false),
+ any_postprocessing_sections_(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.
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
- // doing a relocateable link.
switch (shdr.get_sh_type())
{
case elfcpp::SHT_NULL:
case elfcpp::SHT_RELA:
case elfcpp::SHT_REL:
case elfcpp::SHT_GROUP:
- return parameters->output_is_object();
+ // If we are emitting relocations these should be handled
+ // elsewhere.
+ gold_assert(!parameters->options().relocatable()
+ && !parameters->options().emit_relocs());
+ return false;
case elfcpp::SHT_PROGBITS:
- if (parameters->strip_debug()
+ if (parameters->options().strip_debug()
&& (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
{
// Debugging sections can only be recognized by name.
|| is_prefix_of(".stab", name))
return false;
}
- if (parameters->strip_debug_gdb()
+ if (parameters->options().strip_debug_gdb()
&& (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
{
// Debugging sections can only be recognized by name.
Output_section*
Layout::find_output_section(const char* name) const
{
- for (Section_name_map::const_iterator p = this->section_name_map_.begin();
- p != this->section_name_map_.end();
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
++p)
- if (strcmp(p->second->name(), name) == 0)
- return p->second;
+ if (strcmp((*p)->name(), name) == 0)
+ return *p;
return NULL;
}
}
// Return the output section to use for section NAME with type TYPE
-// and section flags FLAGS.
+// and section flags FLAGS. NAME must be canonicalized in the string
+// pool, and NAME_KEY is the key.
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(
else
{
// This is the first time we've seen this name/type/flags
- // combination.
- Output_section* os = this->make_output_section(name, type, flags);
+ // combination. If the section has contents but no flags, then
+ // see whether we have an existing section with the same name.
+ // This is a workaround for cases where assembler code forgets
+ // to set section flags, and the GNU linker would simply pick an
+ // existing section with the same name. FIXME: Perhaps there
+ // should be an option to control this.
+ Output_section* os = NULL;
+ if (type == elfcpp::SHT_PROGBITS && flags == 0)
+ {
+ os = this->find_output_section(name);
+ if (os != NULL && os->type() != elfcpp::SHT_PROGBITS)
+ os = NULL;
+ }
+ if (os == NULL)
+ os = this->make_output_section(name, type, flags);
ins.first->second = os;
return os;
}
}
+// Pick the output section to use for section NAME, in input file
+// RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a
+// linker created section. ADJUST_NAME is true if we should apply the
+// standard name mappings in Layout::output_section_name. This will
+// return NULL if the input section should be discarded.
+
+Output_section*
+Layout::choose_output_section(const Relobj* relobj, const char* name,
+ elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
+ bool adjust_name)
+{
+ // We should ignore some flags. FIXME: This will need some
+ // adjustment for ld -r.
+ flags &= ~ (elfcpp::SHF_INFO_LINK
+ | elfcpp::SHF_LINK_ORDER
+ | elfcpp::SHF_GROUP
+ | elfcpp::SHF_MERGE
+ | elfcpp::SHF_STRINGS);
+
+ if (this->script_options_->saw_sections_clause())
+ {
+ // We are using a SECTIONS clause, so the output section is
+ // chosen based only on the name.
+
+ Script_sections* ss = this->script_options_->script_sections();
+ const char* file_name = relobj == NULL ? NULL : relobj->name().c_str();
+ Output_section** output_section_slot;
+ name = ss->output_section_name(file_name, name, &output_section_slot);
+ if (name == NULL)
+ {
+ // The SECTIONS clause says to discard this input section.
+ return NULL;
+ }
+
+ // If this is an orphan section--one not mentioned in the linker
+ // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the
+ // default processing below.
+
+ if (output_section_slot != NULL)
+ {
+ if (*output_section_slot != NULL)
+ return *output_section_slot;
+
+ // We don't put sections found in the linker script into
+ // SECTION_NAME_MAP_. That keeps us from getting confused
+ // if an orphan section is mapped to a section with the same
+ // name as one in the linker script.
+
+ name = this->namepool_.add(name, false, NULL);
+
+ Output_section* os = this->make_output_section(name, type, flags);
+ os->set_found_in_sections_clause();
+ *output_section_slot = os;
+ return os;
+ }
+ }
+
+ // FIXME: Handle SHF_OS_NONCONFORMING somewhere.
+
+ // Turn NAME from the name of the input section into the name of the
+ // output section.
+
+ size_t len = strlen(name);
+ if (adjust_name && !parameters->options().relocatable())
+ name = Layout::output_section_name(name, &len);
+
+ Stringpool::Key name_key;
+ name = this->namepool_.add_with_length(name, len, true, &name_key);
+
+ // Find or make the output section. The output section is selected
+ // based on the section name, type, and flags.
+ return this->get_output_section(name, name_key, type, flags);
+}
+
// 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 (!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);
+ Output_section* os;
- // FIXME: Handle SHF_OS_NONCONFORMING here.
+ // In a relocatable link a grouped section must not be combined with
+ // any other sections.
+ if (parameters->options().relocatable()
+ && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0)
+ {
+ name = this->namepool_.add(name, true, NULL);
+ os = this->make_output_section(name, shdr.get_sh_type(),
+ shdr.get_sh_flags());
+ }
+ else
+ {
+ os = this->choose_output_section(object, name, shdr.get_sh_type(),
+ shdr.get_sh_flags(), true);
+ if (os == NULL)
+ return NULL;
+ }
- // Canonicalize the section name.
- Stringpool::Key name_key;
- name = this->namepool_.add_prefix(name, len, &name_key);
+ // FIXME: Handle SHF_LINK_ORDER somewhere.
- // 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());
+ *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx,
+ this->script_options_->saw_sections_clause());
- // FIXME: Handle SHF_LINK_ORDER somewhere.
+ return os;
+}
+
+// Handle a relocation section when doing a relocatable link.
+
+template<int size, bool big_endian>
+Output_section*
+Layout::layout_reloc(Sized_relobj<size, big_endian>* object,
+ unsigned int,
+ const elfcpp::Shdr<size, big_endian>& shdr,
+ Output_section* data_section,
+ Relocatable_relocs* rr)
+{
+ gold_assert(parameters->options().relocatable()
+ || parameters->options().emit_relocs());
+
+ int sh_type = shdr.get_sh_type();
+
+ std::string name;
+ if (sh_type == elfcpp::SHT_REL)
+ name = ".rel";
+ else if (sh_type == elfcpp::SHT_RELA)
+ name = ".rela";
+ else
+ gold_unreachable();
+ name += data_section->name();
+
+ Output_section* os = this->choose_output_section(object, name.c_str(),
+ sh_type,
+ shdr.get_sh_flags(),
+ false);
- *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx);
+ os->set_should_link_to_symtab();
+ os->set_info_section(data_section);
+
+ Output_section_data* posd;
+ if (sh_type == elfcpp::SHT_REL)
+ {
+ os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
+ posd = new Output_relocatable_relocs<elfcpp::SHT_REL,
+ size,
+ big_endian>(rr);
+ }
+ else if (sh_type == elfcpp::SHT_RELA)
+ {
+ os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
+ posd = new Output_relocatable_relocs<elfcpp::SHT_RELA,
+ size,
+ big_endian>(rr);
+ }
+ else
+ gold_unreachable();
+
+ os->add_output_section_data(posd);
+ rr->set_output_data(posd);
return os;
}
+// Handle a group section when doing a relocatable link.
+
+template<int size, bool big_endian>
+void
+Layout::layout_group(Symbol_table* symtab,
+ Sized_relobj<size, big_endian>* object,
+ unsigned int,
+ const char* group_section_name,
+ const char* signature,
+ const elfcpp::Shdr<size, big_endian>& shdr,
+ const elfcpp::Elf_Word* contents)
+{
+ gold_assert(parameters->options().relocatable());
+ gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP);
+ group_section_name = this->namepool_.add(group_section_name, true, NULL);
+ Output_section* os = this->make_output_section(group_section_name,
+ elfcpp::SHT_GROUP,
+ shdr.get_sh_flags());
+
+ // We need to find a symbol with the signature in the symbol table.
+ // If we don't find one now, we need to look again later.
+ Symbol* sym = symtab->lookup(signature, NULL);
+ if (sym != NULL)
+ os->set_info_symndx(sym);
+ else
+ {
+ // We will wind up using a symbol whose name is the signature.
+ // So just put the signature in the symbol name pool to save it.
+ signature = symtab->canonicalize_name(signature);
+ this->group_signatures_.push_back(Group_signature(os, signature));
+ }
+
+ os->set_should_link_to_symtab();
+ os->set_entsize(4);
+
+ section_size_type entry_count =
+ convert_to_section_size_type(shdr.get_sh_size() / 4);
+ Output_section_data* posd =
+ new Output_data_group<size, big_endian>(object, entry_count, contents);
+ os->add_output_section_data(posd);
+}
+
// 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/).
gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS);
gold_assert(shdr.get_sh_flags() == elfcpp::SHF_ALLOC);
- Stringpool::Key name_key;
- const char* name = this->namepool_.add(".eh_frame", false, &name_key);
-
- Output_section* os = this->get_output_section(name, name_key,
- elfcpp::SHT_PROGBITS,
- elfcpp::SHF_ALLOC);
+ const char* const name = ".eh_frame";
+ Output_section* os = this->choose_output_section(object,
+ name,
+ elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC,
+ false);
+ if (os == NULL)
+ return NULL;
if (this->eh_frame_section_ == NULL)
{
this->eh_frame_data_ = new Eh_frame();
os->add_output_section_data(this->eh_frame_data_);
- if (this->options_.create_eh_frame_hdr())
+ if (this->options_.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);
+ this->choose_output_section(NULL,
+ ".eh_frame_hdr",
+ elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC,
+ false);
- Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, this->eh_frame_data_);
- hdr_os->add_output_section_data(hdr_posd);
+ if (hdr_os != NULL)
+ {
+ 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();
+ 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);
+ if (!this->script_options_->saw_phdrs_clause())
+ {
+ Output_segment* hdr_oseg;
+ hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME,
+ elfcpp::PF_R);
+ hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R);
+ }
- this->eh_frame_data_->set_eh_frame_hdr(hdr_posd);
+ this->eh_frame_data_->set_eh_frame_hdr(hdr_posd);
+ }
}
}
{
// 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);
+ bool saw_sections_clause = this->script_options_->saw_sections_clause();
+ *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx,
+ saw_sections_clause);
}
return os;
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);
+ Output_section* os = this->choose_output_section(NULL, name, type, flags,
+ false);
+ if (os != NULL)
+ os->add_output_section_data(posd);
}
// Map section flags to segment flags.
this->unattached_section_list_.push_back(os);
else
{
+ if (parameters->options().relocatable())
+ return os;
+
+ // If we have a SECTIONS clause, we can't handle the attachment
+ // to segments until after we've seen all the sections.
+ if (this->script_options_->saw_sections_clause())
+ return os;
+
+ gold_assert(!this->script_options_->saw_phdrs_clause());
+
// This output section goes into a PT_LOAD segment.
elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags);
- // The only thing we really care about for PT_LOAD segments is
- // whether or not they are writable, so that is how we search
- // for them. People who need segments sorted on some other
- // basis will have to wait until we implement a mechanism for
- // them to describe the segments they want.
+ // In general the only thing we really care about for PT_LOAD
+ // segments is whether or not they are writable, so that is how
+ // we search for them. People who need segments sorted on some
+ // other basis will have to use a linker script.
Segment_list::const_iterator p;
for (p = this->segment_list_.begin();
if ((*p)->type() == elfcpp::PT_LOAD
&& ((*p)->flags() & elfcpp::PF_W) == (seg_flags & elfcpp::PF_W))
{
+ // If -Tbss was specified, we need to separate the data
+ // and BSS segments.
+ if (this->options_.user_set_Tbss())
+ {
+ if ((type == elfcpp::SHT_NOBITS)
+ == (*p)->has_any_data_sections())
+ continue;
+ }
+
(*p)->add_output_section(os, seg_flags);
break;
}
if (p == this->segment_list_.end())
{
- Output_segment* oseg = new Output_segment(elfcpp::PT_LOAD,
- seg_flags);
- this->segment_list_.push_back(oseg);
+ Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD,
+ seg_flags);
oseg->add_output_section(os, seg_flags);
}
if (p == this->segment_list_.end())
{
- Output_segment* oseg = new Output_segment(elfcpp::PT_NOTE,
- seg_flags);
- this->segment_list_.push_back(oseg);
+ Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE,
+ seg_flags);
oseg->add_output_section(os, seg_flags);
}
}
if ((flags & elfcpp::SHF_TLS) != 0)
{
if (this->tls_segment_ == NULL)
- {
- this->tls_segment_ = new Output_segment(elfcpp::PT_TLS,
- seg_flags);
- this->segment_list_.push_back(this->tls_segment_);
- }
+ this->tls_segment_ = this->make_output_segment(elfcpp::PT_TLS,
+ seg_flags);
this->tls_segment_->add_output_section(os, seg_flags);
}
}
return os;
}
+// Make an output section for a script.
+
+Output_section*
+Layout::make_output_section_for_script(const char* name)
+{
+ name = this->namepool_.add(name, false, NULL);
+ Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC);
+ os->set_found_in_sections_clause();
+ return os;
+}
+
+// Return the number of segments we expect to see.
+
+size_t
+Layout::expected_segment_count() const
+{
+ size_t ret = this->segment_list_.size();
+
+ // If we didn't see a SECTIONS clause in a linker script, we should
+ // already have the complete list of segments. Otherwise we ask the
+ // SECTIONS clause how many segments it expects, and add in the ones
+ // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.)
+
+ if (!this->script_options_->saw_sections_clause())
+ return ret;
+ else
+ {
+ const Script_sections* ss = this->script_options_->script_sections();
+ return ret + ss->expected_segment_count(this);
+ }
+}
+
// 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
// relocs.
void
-Layout::create_initial_dynamic_sections(const Input_objects* input_objects,
- Symbol_table* symtab)
+Layout::create_initial_dynamic_sections(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));
+ this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic",
+ elfcpp::SHT_DYNAMIC,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ false);
- symtab->define_in_output_data(input_objects->target(), "_DYNAMIC", NULL,
- this->dynamic_section_, 0, 0,
+ symtab->define_in_output_data("_DYNAMIC", NULL, this->dynamic_section_, 0, 0,
elfcpp::STT_OBJECT, elfcpp::STB_LOCAL,
elfcpp::STV_HIDDEN, 0, false, false);
// extension.
void
-Layout::define_section_symbols(Symbol_table* symtab, const Target* target)
+Layout::define_section_symbols(Symbol_table* symtab)
{
for (Section_list::const_iterator p = this->section_list_.begin();
p != this->section_list_.end();
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(),
+ symtab->define_in_output_data(start_name.c_str(),
NULL, // version
*p,
0, // value
elfcpp::STV_DEFAULT,
0, // nonvis
false, // offset_is_from_end
- false); // only_if_ref
+ true); // only_if_ref
- symtab->define_in_output_data(target,
- stop_name.c_str(),
+ symtab->define_in_output_data(stop_name.c_str(),
NULL, // version
*p,
0, // value
elfcpp::STV_DEFAULT,
0, // nonvis
true, // offset_is_from_end
- false); // only_if_ref
+ true); // only_if_ref
+ }
+ }
+}
+
+// Define symbols for group signatures.
+
+void
+Layout::define_group_signatures(Symbol_table* symtab)
+{
+ for (Group_signatures::iterator p = this->group_signatures_.begin();
+ p != this->group_signatures_.end();
+ ++p)
+ {
+ Symbol* sym = symtab->lookup(p->signature, NULL);
+ if (sym != NULL)
+ p->section->set_info_symndx(sym);
+ else
+ {
+ // Force the name of the group section to the group
+ // signature, and use the group's section symbol as the
+ // signature symbol.
+ if (strcmp(p->section->name(), p->signature) != 0)
+ {
+ const char* name = this->namepool_.add(p->signature,
+ true, NULL);
+ p->section->set_name(name);
+ }
+ p->section->set_needs_symtab_index();
+ p->section->set_info_section_symndx(p->section);
}
}
+
+ this->group_signatures_.clear();
}
// Find the first read-only PT_LOAD segment, creating one if
return *p;
}
- Output_segment* load_seg = new Output_segment(elfcpp::PT_LOAD, elfcpp::PF_R);
- this->segment_list_.push_back(load_seg);
+ gold_assert(!this->script_options_->saw_phdrs_clause());
+
+ Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD,
+ elfcpp::PF_R);
return load_seg;
}
// This function returns the size of the output file.
off_t
-Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab)
+Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab,
+ Target* target, const Task* task)
{
- Target* const target = input_objects->target();
-
target->finalize_sections(this);
+ this->count_local_symbols(task, input_objects);
+
this->create_gold_note();
this->create_executable_stack_info(target);
Output_segment* phdr_seg = NULL;
- if (!parameters->doing_static_link())
+ if (!parameters->options().relocatable() && !parameters->doing_static_link())
{
// 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);
+ if (!this->script_options_->saw_phdrs_clause())
+ phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R);
// 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,
+ Versions versions(*this->script_options()->version_script_info(),
+ &this->dynpool_);
+ this->create_dynamic_symtab(input_objects, 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())
+ if (!parameters->options().shared())
this->create_interp(target);
// Finish the .dynamic section to hold the dynamic data, and put
dynamic_symbols, dynstr);
}
- // FIXME: Handle PT_GNU_STACK.
+ // If there is a SECTIONS clause, put all the input sections into
+ // the required order.
+ Output_segment* load_seg;
+ if (this->script_options_->saw_sections_clause())
+ load_seg = this->set_section_addresses_from_script(symtab);
+ else if (parameters->options().relocatable())
+ load_seg = NULL;
+ else
+ load_seg = this->find_first_load_seg();
+
+ if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF)
+ load_seg = NULL;
- Output_segment* load_seg = this->find_first_load_seg();
+ gold_assert(phdr_seg == NULL || load_seg != NULL);
// 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);
+ if (parameters->options().relocatable())
+ segment_headers = NULL;
+ else
+ {
+ segment_headers = new Output_segment_headers(this->segment_list_);
+ if (load_seg != NULL)
+ load_seg->add_initial_output_data(segment_headers);
+ if (phdr_seg != NULL)
+ phdr_seg->add_initial_output_data(segment_headers);
+ }
// 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);
+ file_header = new Output_file_header(target, symtab, segment_headers,
+ this->options_.entry());
+ if (load_seg != NULL)
+ load_seg->add_initial_output_data(file_header);
+
this->special_output_list_.push_back(file_header);
+ if (segment_headers != NULL)
+ this->special_output_list_.push_back(segment_headers);
+
+ if (this->script_options_->saw_phdrs_clause()
+ && !parameters->options().relocatable())
+ {
+ // Support use of FILEHDRS and PHDRS attachments in a PHDRS
+ // clause in a linker script.
+ Script_sections* ss = this->script_options_->script_sections();
+ ss->put_headers_in_phdrs(file_header, segment_headers);
+ }
// We set the output section indexes in set_segment_offsets and
// set_section_indexes.
// 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);
+ off_t off;
+ if (!parameters->options().relocatable())
+ off = this->set_segment_offsets(target, load_seg, &shndx);
+ else
+ off = this->set_relocatable_section_offsets(file_header, &shndx);
+
+ // Set the file offsets of all the non-data sections we've seen so
+ // far which don't have to wait for the input sections. We need
+ // this in order to finalize local symbols in non-allocated
+ // sections.
+ off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS);
// Create the symbol table sections.
this->create_symtab_sections(input_objects, symtab, &off);
+ if (!parameters->doing_static_link())
+ this->assign_local_dynsym_offsets(input_objects);
+
+ // Process any symbol assignments from a linker script. This must
+ // be called after the symbol table has been finalized.
+ this->script_options_->finalize_symbols(symtab, this);
// Create the .shstrtab section.
Output_section* shstrtab_section = this->create_shstrtab();
- // Set the file offsets of all the non-data sections which don't
- // have to wait for the input sections.
+ // Set the file offsets of the rest of the non-data sections which
+ // don't have to wait for the input sections.
off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS);
// Now that all sections have been created, set the section indexes.
// Create the section table header.
this->create_shdrs(&off);
+ // If there are no sections which require postprocessing, we can
+ // handle the section names now, and avoid a resize later.
+ if (!this->any_postprocessing_sections_)
+ off = this->set_section_offsets(off,
+ STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS);
+
file_header->set_section_info(this->section_headers_, shstrtab_section);
// Now we know exactly where everything goes in the output file
void
Layout::create_gold_note()
{
- if (parameters->output_is_object())
+ if (parameters->options().relocatable())
return;
// Authorities all agree that the values in a .note field should
// .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();
+ const int size = parameters->target().get_size();
#else
const int size = 32;
#endif
gold_assert(sizeof buffer >= notesz);
memset(buffer, 0, notesz);
- bool is_big_endian = parameters->is_big_endian();
+ bool is_big_endian = parameters->target().is_big_endian();
if (size == 32)
{
is_stack_executable = false;
}
- if (parameters->output_is_object())
+ if (parameters->options().relocatable())
{
const char* name = this->namepool_.add(".note.GNU-stack", false, NULL);
elfcpp::Elf_Xword flags = 0;
}
else
{
+ if (this->script_options_->saw_phdrs_clause())
+ return;
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);
+ this->make_output_segment(elfcpp::PT_GNU_STACK, flags);
}
}
return flags1 < flags2;
}
+ // If the addresses are set already, sort by load address.
+ if (seg1->are_addresses_set())
+ {
+ if (!seg2->are_addresses_set())
+ return true;
+
+ unsigned int section_count1 = seg1->output_section_count();
+ unsigned int section_count2 = seg2->output_section_count();
+ if (section_count1 == 0 && section_count2 > 0)
+ return true;
+ if (section_count1 > 0 && section_count2 == 0)
+ return false;
+
+ uint64_t paddr1 = seg1->first_section_load_address();
+ uint64_t paddr2 = seg2->first_section_load_address();
+ if (paddr1 != paddr2)
+ return paddr1 < paddr2;
+ }
+ else if (seg2->are_addresses_set())
+ return false;
+
// 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.
+ // come before writable segments. Then writable segments with data
+ // come before writable segments without data. 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_W) != 0
+ && seg1->has_any_data_sections() != seg2->has_any_data_sections())
+ return seg1->has_any_data_sections();
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;
+ // We shouldn't get here--we shouldn't create segments which we
+ // can't distinguish.
+ gold_unreachable();
}
// Set the file offsets of all the segments, and all the sections they
// 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();
+ if (this->options_.user_set_Ttext())
+ addr = this->options_.Ttext();
+ else if (parameters->options().shared())
+ addr = 0;
else
addr = target->default_text_segment_address();
off_t off = 0;
+
+ // If LOAD_SEG is NULL, then the file header and segment headers
+ // will not be loadable. But they still need to be at offset 0 in
+ // the file. Set their offsets now.
+ if (load_seg == NULL)
+ {
+ for (Data_list::iterator p = this->special_output_list_.begin();
+ p != this->special_output_list_.end();
+ ++p)
+ {
+ off = align_address(off, (*p)->addralign());
+ (*p)->set_address_and_file_offset(0, off);
+ off += (*p)->data_size();
+ }
+ }
+
bool was_readonly = false;
for (Segment_list::iterator p = this->segment_list_.begin();
p != this->segment_list_.end();
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.
+ bool are_addresses_set = (*p)->are_addresses_set();
+ if (are_addresses_set)
+ {
+ // When it comes to setting file offsets, we care about
+ // the physical address.
+ addr = (*p)->paddr();
+ }
+ else if (this->options_.user_set_Tdata()
+ && ((*p)->flags() & elfcpp::PF_W) != 0
+ && (!this->options_.user_set_Tbss()
+ || (*p)->has_any_data_sections()))
+ {
+ addr = this->options_.Tdata();
+ are_addresses_set = true;
+ }
+ else if (this->options_.user_set_Tbss()
+ && ((*p)->flags() & elfcpp::PF_W) != 0
+ && !(*p)->has_any_data_sections())
+ {
+ addr = this->options_.Tbss();
+ are_addresses_set = true;
+ }
uint64_t orig_addr = addr;
uint64_t orig_off = off;
- uint64_t aligned_addr = addr;
+ uint64_t aligned_addr = 0;
uint64_t abi_pagesize = target->abi_pagesize();
- // FIXME: This should depend on the -n and -N options.
- (*p)->set_minimum_addralign(target->common_pagesize());
+ // FIXME: This should depend on the -n and -N options.
+ (*p)->set_minimum_p_align(target->common_pagesize());
- if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0)
+ if (are_addresses_set)
{
- uint64_t align = (*p)->addralign();
-
- addr = align_address(addr, align);
+ // Adjust the file offset to the same address modulo the
+ // page size.
+ uint64_t unsigned_off = off;
+ uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1))
+ | (addr & (abi_pagesize - 1)));
+ if (aligned_off < unsigned_off)
+ aligned_off += abi_pagesize;
+ off = aligned_off;
+ }
+ else
+ {
+ // 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.
+
+ addr = align_address(addr, (*p)->maximum_alignment());
aligned_addr = addr;
- if ((addr & (abi_pagesize - 1)) != 0)
- addr = addr + abi_pagesize;
+
+ if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0)
+ {
+ if ((addr & (abi_pagesize - 1)) != 0)
+ addr = addr + abi_pagesize;
+ }
+
+ off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1));
}
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);
+ uint64_t new_addr = (*p)->set_section_addresses(false, 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
// page. Here we use the real machine page size rather than
// the ABI mandated page size.
- if (aligned_addr != addr)
+ if (!are_addresses_set && aligned_addr != addr)
{
uint64_t common_pagesize = target->common_pagesize();
uint64_t first_off = (common_pagesize
{
*pshndx = shndx_hold;
addr = align_address(aligned_addr, common_pagesize);
+ addr = align_address(addr, (*p)->maximum_alignment());
off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1));
- new_addr = (*p)->set_section_addresses(addr, &off, pshndx);
+ new_addr = (*p)->set_section_addresses(true, addr, &off,
+ pshndx);
}
}
(*p)->set_offset();
}
+ // Set the TLS offsets for each section in the PT_TLS segment.
+ if (this->tls_segment_ != NULL)
+ this->tls_segment_->set_tls_offsets();
+
+ return off;
+}
+
+// Set the offsets of all the allocated sections when doing a
+// relocatable link. This does the same jobs as set_segment_offsets,
+// only for a relocatable link.
+
+off_t
+Layout::set_relocatable_section_offsets(Output_data* file_header,
+ unsigned int *pshndx)
+{
+ off_t off = 0;
+
+ file_header->set_address_and_file_offset(0, 0);
+ off += file_header->data_size();
+
+ for (Section_list::iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ // We skip unallocated sections here, except that group sections
+ // have to come first.
+ if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0
+ && (*p)->type() != elfcpp::SHT_GROUP)
+ continue;
+
+ off = align_address(off, (*p)->addralign());
+
+ // The linker script might have set the address.
+ if (!(*p)->is_address_valid())
+ (*p)->set_address(0);
+ (*p)->set_file_offset(off);
+ (*p)->finalize_data_size();
+ off += (*p)->data_size();
+
+ (*p)->set_out_shndx(*pshndx);
+ ++*pshndx;
+ }
+
return off;
}
if (*p == this->symtab_section_)
continue;
+ // If we've already set the data size, don't set it again.
+ if ((*p)->is_offset_valid() && (*p)->is_data_size_valid())
+ continue;
+
if (pass == BEFORE_INPUT_SECTIONS_PASS
&& (*p)->requires_postprocessing())
- (*p)->create_postprocessing_buffer();
+ {
+ (*p)->create_postprocessing_buffer();
+ this->any_postprocessing_sections_ = true;
+ }
if (pass == BEFORE_INPUT_SECTIONS_PASS
&& (*p)->after_input_sections())
continue;
- else if (pass == AFTER_INPUT_SECTIONS_PASS
+ else if (pass == POSTPROCESSING_SECTIONS_PASS
&& (!(*p)->after_input_sections()
|| (*p)->type() == elfcpp::SHT_STRTAB))
continue;
- else if (pass == STRTAB_AFTER_INPUT_SECTIONS_PASS
+ else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
&& (!(*p)->after_input_sections()
|| (*p)->type() != elfcpp::SHT_STRTAB))
continue;
off += (*p)->data_size();
// At this point the name must be set.
- if (pass != STRTAB_AFTER_INPUT_SECTIONS_PASS)
+ if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS)
this->namepool_.add((*p)->name(), false, NULL);
}
return off;
unsigned int
Layout::set_section_indexes(unsigned int shndx)
{
+ const bool output_is_object = parameters->options().relocatable();
for (Section_list::iterator p = this->unattached_section_list_.begin();
p != this->unattached_section_list_.end();
++p)
{
+ // In a relocatable link, we already did group sections.
+ if (output_is_object
+ && (*p)->type() == elfcpp::SHT_GROUP)
+ continue;
+
(*p)->set_out_shndx(shndx);
++shndx;
}
return shndx;
}
+// Set the section addresses according to the linker script. This is
+// only called when we see a SECTIONS clause. This returns the
+// program segment which should hold the file header and segment
+// headers, if any. It will return NULL if they should not be in a
+// segment.
+
+Output_segment*
+Layout::set_section_addresses_from_script(Symbol_table* symtab)
+{
+ Script_sections* ss = this->script_options_->script_sections();
+ gold_assert(ss->saw_sections_clause());
+
+ // Place each orphaned output section in the script.
+ for (Section_list::iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ if (!(*p)->found_in_sections_clause())
+ ss->place_orphan(*p);
+ }
+
+ return this->script_options_->set_section_addresses(symtab, this);
+}
+
+// Count the local symbols in the regular symbol table and the dynamic
+// symbol table, and build the respective string pools.
+
+void
+Layout::count_local_symbols(const Task* task,
+ const Input_objects* input_objects)
+{
+ // First, figure out an upper bound on the number of symbols we'll
+ // be inserting into each pool. This helps us create the pools with
+ // the right size, to avoid unnecessary hashtable resizing.
+ unsigned int symbol_count = 0;
+ for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
+ p != input_objects->relobj_end();
+ ++p)
+ symbol_count += (*p)->local_symbol_count();
+
+ // Go from "upper bound" to "estimate." We overcount for two
+ // reasons: we double-count symbols that occur in more than one
+ // object file, and we count symbols that are dropped from the
+ // output. Add it all together and assume we overcount by 100%.
+ symbol_count /= 2;
+
+ // We assume all symbols will go into both the sympool and dynpool.
+ this->sympool_.reserve(symbol_count);
+ this->dynpool_.reserve(symbol_count);
+
+ for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
+ p != input_objects->relobj_end();
+ ++p)
+ {
+ Task_lock_obj<Object> tlo(task, *p);
+ (*p)->count_local_symbols(&this->sympool_, &this->dynpool_);
+ }
+}
+
// 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.
{
int symsize;
unsigned int align;
- if (parameters->get_size() == 32)
+ if (parameters->target().get_size() == 32)
{
symsize = elfcpp::Elf_sizes<32>::sym_size;
align = 4;
}
- else if (parameters->get_size() == 64)
+ else if (parameters->target().get_size() == 64)
{
symsize = elfcpp::Elf_sizes<64>::sym_size;
align = 8;
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);
off += (index - local_symbol_index) * symsize;
local_symbol_index = index;
}
== this->dynsym_section_->data_size() - locsize);
}
- off = symtab->finalize(local_symcount, off, dynoff, dyn_global_index,
- dyncount, &this->sympool_);
+ off = symtab->finalize(off, dynoff, dyn_global_index, dyncount,
+ &this->sympool_, &local_symcount);
- if (!parameters->strip_all())
+ if (!parameters->options().strip_all())
{
this->sympool_.set_string_offsets();
Output_section_headers* oshdrs;
oshdrs = new Output_section_headers(this,
&this->segment_list_,
+ &this->section_list_,
&this->unattached_section_list_,
&this->namepool_);
off_t off = align_address(*poff, oshdrs->addralign());
// Create the dynamic symbol table.
void
-Layout::create_dynamic_symtab(const Target* target, Symbol_table* symtab,
+Layout::create_dynamic_symtab(const Input_objects* input_objects,
+ Symbol_table* symtab,
Output_section **pdynstr,
unsigned int* plocal_dynamic_count,
std::vector<Symbol*>* pdynamic_symbols,
}
}
- // 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_.
+ // Count the local symbols that need to go in the dynamic symbol table,
+ // and set the dynamic symbol indexes.
+ for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
+ p != input_objects->relobj_end();
+ ++p)
+ {
+ unsigned int new_index = (*p)->set_local_dynsym_indexes(index);
+ index = new_index;
+ }
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,
+ index = symtab->set_dynsym_indexes(index, pdynamic_symbols,
&this->dynpool_, pversions);
int symsize;
unsigned int align;
- const int size = parameters->get_size();
+ const int size = parameters->target().get_size();
if (size == 32)
{
symsize = elfcpp::Elf_sizes<32>::sym_size;
// 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* dynsym = this->choose_output_section(NULL, ".dynsym",
+ elfcpp::SHT_DYNSYM,
+ elfcpp::SHF_ALLOC,
+ false);
Output_section_data* odata = new Output_data_fixed_space(index * symsize,
align);
// 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* dynstr = this->choose_output_section(NULL, ".dynstr",
+ elfcpp::SHT_STRTAB,
+ elfcpp::SHF_ALLOC,
+ false);
Output_section_data* strdata = new Output_data_strtab(&this->dynpool_);
dynstr->add_output_section_data(strdata);
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* hashsec = this->choose_output_section(NULL, ".hash",
+ elfcpp::SHT_HASH,
+ elfcpp::SHF_ALLOC,
+ false);
Output_section_data* hashdata = new Output_data_const_buffer(phash,
hashlen,
odyn->add_section_address(elfcpp::DT_HASH, hashsec);
}
+// Assign offsets to each local portion of the dynamic symbol table.
+
+void
+Layout::assign_local_dynsym_offsets(const Input_objects* input_objects)
+{
+ Output_section* dynsym = this->dynsym_section_;
+ gold_assert(dynsym != NULL);
+
+ off_t off = dynsym->offset();
+
+ // Skip the dummy symbol at the start of the section.
+ off += dynsym->entsize();
+
+ for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
+ p != input_objects->relobj_end();
+ ++p)
+ {
+ unsigned int count = (*p)->set_local_dynsym_offset(off);
+ off += count * dynsym->entsize();
+ }
+}
+
// Create the version sections.
void
if (!versions->any_defs() && !versions->any_needs())
return;
- if (parameters->get_size() == 32)
+ switch (parameters->size_and_endianness())
{
- 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();
+ case Parameters::TARGET_32_LITTLE:
+ this->sized_create_version_sections<32, false>(versions, symtab,
+ local_symcount,
+ dynamic_symbols, dynstr);
+ break;
#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();
+#ifdef HAVE_TARGET_32_BIG
+ case Parameters::TARGET_32_BIG:
+ this->sized_create_version_sections<32, true>(versions, symtab,
+ local_symcount,
+ dynamic_symbols, dynstr);
+ break;
#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();
+ case Parameters::TARGET_64_LITTLE:
+ this->sized_create_version_sections<64, false>(versions, symtab,
+ local_symcount,
+ dynamic_symbols, dynstr);
+ break;
#endif
- }
+#ifdef HAVE_TARGET_64_BIG
+ case Parameters::TARGET_64_BIG:
+ this->sized_create_version_sections<64, true>(versions, symtab,
+ local_symcount,
+ dynamic_symbols, dynstr);
+ break;
+#endif
+ default:
+ gold_unreachable();
}
- else
- gold_unreachable();
}
// Create the version sections, sized version.
const Symbol_table* symtab,
unsigned int local_symcount,
const std::vector<Symbol*>& dynamic_symbols,
- const Output_section* dynstr
- ACCEPT_SIZE_ENDIAN)
+ const Output_section* dynstr)
{
- 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);
+ Output_section* vsec = this->choose_output_section(NULL, ".gnu.version",
+ elfcpp::SHT_GNU_versym,
+ elfcpp::SHF_ALLOC,
+ false);
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));
+ versions->symbol_section_contents<size, big_endian>(symtab, &this->dynpool_,
+ local_symcount,
+ dynamic_symbols,
+ &vbuf, &vsize);
Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2);
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);
+ Output_section* vdsec;
+ vdsec= this->choose_output_section(NULL, ".gnu.version_d",
+ elfcpp::SHT_GNU_verdef,
+ elfcpp::SHF_ALLOC,
+ false);
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));
+ versions->def_section_contents<size, big_endian>(&this->dynpool_, &vdbuf,
+ &vdsize, &vdentries);
Output_section_data* vddata = new Output_data_const_buffer(vdbuf,
vdsize,
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);
+ vnsec = this->choose_output_section(NULL, ".gnu.version_r",
+ elfcpp::SHT_GNU_verneed,
+ elfcpp::SHF_ALLOC,
+ false);
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));
+ versions->need_section_contents<size, big_endian>(&this->dynpool_,
+ &vnbuf, &vnsize,
+ &vnentries);
Output_section_data* vndata = new Output_data_const_buffer(vnbuf,
vnsize,
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);
+ Output_section* osec = this->choose_output_section(NULL, ".interp",
+ elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC,
+ false);
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);
+ if (!this->script_options_->saw_phdrs_clause())
+ {
+ Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP,
+ elfcpp::PF_R);
+ oseg->add_initial_output_section(osec, elfcpp::PF_R);
+ }
}
// Finish the .dynamic section and PT_DYNAMIC segment.
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);
+ if (!this->script_options_->saw_phdrs_clause())
+ {
+ Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC,
+ (elfcpp::PF_R
+ | elfcpp::PF_W));
+ oseg->add_initial_output_section(this->dynamic_section_,
+ elfcpp::PF_R | elfcpp::PF_W);
+ }
Output_data_dynamic* const odyn = this->dynamic_data_;
odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname());
}
+ if (parameters->options().shared())
+ {
+ const char* soname = this->options_.soname();
+ if (soname != NULL)
+ odyn->add_string(elfcpp::DT_SONAME, soname);
+ }
+
// FIXME: Support --init and --fini.
Symbol* sym = symtab->lookup("_init");
if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj())
// 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 (!this->script_options_->saw_sections_clause())
{
- if (((*p)->flags() & elfcpp::PF_W) == 0
- && (*p)->dynamic_reloc_count() > 0)
- {
- have_textrel = true;
- break;
- }
+ 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;
+ }
+ }
+ }
+ else
+ {
+ // We don't know the section -> segment mapping, so we are
+ // conservative and just look for readonly sections with
+ // relocations. If those sections wind up in writable segments,
+ // then we have created an unnecessary DT_TEXTREL entry.
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ {
+ if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0
+ && ((*p)->flags() & elfcpp::SHF_WRITE) == 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;
+ {
+ // Add a DT_TEXTREL for compatibility with older loaders.
+ odyn->add_constant(elfcpp::DT_TEXTREL, 0);
+ flags |= elfcpp::DF_TEXTREL;
+ }
+ if (parameters->options().shared() && this->has_static_tls())
+ flags |= elfcpp::DF_STATIC_TLS;
odyn->add_constant(elfcpp::DT_FLAGS, flags);
}
}
}
+// Store the allocated sections into the section list.
+
+void
+Layout::get_allocated_sections(Section_list* section_list) const
+{
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0)
+ section_list->push_back(*p);
+}
+
+// Create an output segment.
+
+Output_segment*
+Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
+{
+ gold_assert(!parameters->options().relocatable());
+ Output_segment* oseg = new Output_segment(type, flags);
+ this->segment_list_.push_back(oseg);
+ return oseg;
+}
+
// 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_data(const Symbol_table* symtab, Output_file* of) const
{
- if (!parameters->strip_all())
+ if (!parameters->options().strip_all())
{
const Output_section* symtab_section = this->symtab_section_;
for (Section_list::const_iterator p = this->section_list_.begin();
// 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);
-
- // 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_)
+ if (this->any_postprocessing_sections_)
{
- of->resize(off);
- this->output_file_size_ = off;
+ off_t off = this->output_file_size_;
+ off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS);
+
+ // Now that we've finalized the names, we can finalize the shstrab.
+ off =
+ this->set_section_offsets(off,
+ STRTAB_AFTER_POSTPROCESSING_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)->write(of);
}
- for (Section_list::const_iterator p = this->unattached_section_list_.begin();
- p != this->unattached_section_list_.end();
+ this->section_headers_->write(of);
+}
+
+// Write out a binary file. This is called after the link is
+// complete. IN is the temporary output file we used to generate the
+// ELF code. We simply walk through the segments, read them from
+// their file offset in IN, and write them to their load address in
+// the output file. FIXME: with a bit more work, we could support
+// S-records and/or Intel hex format here.
+
+void
+Layout::write_binary(Output_file* in) const
+{
+ gold_assert(this->options_.oformat_enum()
+ == General_options::OBJECT_FORMAT_BINARY);
+
+ // Get the size of the binary file.
+ uint64_t max_load_address = 0;
+ for (Segment_list::const_iterator p = this->segment_list_.begin();
+ p != this->segment_list_.end();
++p)
{
- if ((*p)->after_input_sections())
- (*p)->write(of);
+ if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0)
+ {
+ uint64_t max_paddr = (*p)->paddr() + (*p)->filesz();
+ if (max_paddr > max_load_address)
+ max_load_address = max_paddr;
+ }
}
- this->section_headers_->write(of);
+ Output_file out(parameters->options().output_file_name());
+ out.open(max_load_address);
+
+ for (Segment_list::const_iterator p = this->segment_list_.begin();
+ p != this->segment_list_.end();
+ ++p)
+ {
+ if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0)
+ {
+ const unsigned char* vin = in->get_input_view((*p)->offset(),
+ (*p)->filesz());
+ unsigned char* vout = out.get_output_view((*p)->paddr(),
+ (*p)->filesz());
+ memcpy(vout, vin, (*p)->filesz());
+ out.write_output_view((*p)->paddr(), (*p)->filesz(), vout);
+ in->free_input_view((*p)->offset(), (*p)->filesz(), vin);
+ }
+ }
+
+ out.close();
}
// Print statistical information to stderr. This is used for --stats.
this->namepool_.print_stats("section name pool");
this->sympool_.print_stats("output symbol name pool");
this->dynpool_.print_stats("dynamic name pool");
+
+ for (Section_list::const_iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ (*p)->print_merge_stats();
}
// Write_sections_task methods.
// We can always run this task.
-Task::Is_runnable_type
-Write_sections_task::is_runnable(Workqueue*)
+Task_token*
+Write_sections_task::is_runnable()
{
- return IS_RUNNABLE;
+ return NULL;
}
// 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)
+void
+Write_sections_task::locks(Task_locker* tl)
{
- return new Write_sections_locker(*this->output_sections_blocker_,
- *this->final_blocker_,
- workqueue);
+ tl->add(this, this->output_sections_blocker_);
+ tl->add(this, this->final_blocker_);
}
// Run the task--write out the data.
// We can always run this task.
-Task::Is_runnable_type
-Write_data_task::is_runnable(Workqueue*)
+Task_token*
+Write_data_task::is_runnable()
{
- return IS_RUNNABLE;
+ return NULL;
}
// We need to unlock FINAL_BLOCKER when finished.
-Task_locker*
-Write_data_task::locks(Workqueue* workqueue)
+void
+Write_data_task::locks(Task_locker* tl)
{
- return new Task_locker_block(*this->final_blocker_, workqueue);
+ tl->add(this, this->final_blocker_);
}
// Run the task--write out the data.
// We can always run this task.
-Task::Is_runnable_type
-Write_symbols_task::is_runnable(Workqueue*)
+Task_token*
+Write_symbols_task::is_runnable()
{
- return IS_RUNNABLE;
+ return NULL;
}
// We need to unlock FINAL_BLOCKER when finished.
-Task_locker*
-Write_symbols_task::locks(Workqueue* workqueue)
+void
+Write_symbols_task::locks(Task_locker* tl)
{
- return new Task_locker_block(*this->final_blocker_, workqueue);
+ tl->add(this, this->final_blocker_);
}
// Run the task--write out the symbols.
// We can only run this task after the input sections have completed.
-Task::Is_runnable_type
-Write_after_input_sections_task::is_runnable(Workqueue*)
+Task_token*
+Write_after_input_sections_task::is_runnable()
{
if (this->input_sections_blocker_->is_blocked())
- return IS_BLOCKED;
- return IS_RUNNABLE;
+ return this->input_sections_blocker_;
+ return NULL;
}
// We need to unlock FINAL_BLOCKER when finished.
-Task_locker*
-Write_after_input_sections_task::locks(Workqueue* workqueue)
+void
+Write_after_input_sections_task::locks(Task_locker* tl)
{
- return new Task_locker_block(*this->final_blocker_, workqueue);
+ tl->add(this, this->final_blocker_);
}
// Run the task.
// Run the task--close the file.
void
-Close_task_runner::run(Workqueue*)
+Close_task_runner::run(Workqueue*, const Task*)
{
+ // If we've been asked to create a binary file, we do so here.
+ if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF)
+ this->layout_->write_binary(this->of_);
+
this->of_->close();
}
#ifdef HAVE_TARGET_32_LITTLE
template
Output_section*
+Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object,
+ unsigned int reloc_shndx,
+ const elfcpp::Shdr<32, false>& shdr,
+ Output_section* data_section,
+ Relocatable_relocs* rr);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+Output_section*
+Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object,
+ unsigned int reloc_shndx,
+ const elfcpp::Shdr<32, true>& shdr,
+ Output_section* data_section,
+ Relocatable_relocs* rr);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+Output_section*
+Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object,
+ unsigned int reloc_shndx,
+ const elfcpp::Shdr<64, false>& shdr,
+ Output_section* data_section,
+ Relocatable_relocs* rr);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+Output_section*
+Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object,
+ unsigned int reloc_shndx,
+ const elfcpp::Shdr<64, true>& shdr,
+ Output_section* data_section,
+ Relocatable_relocs* rr);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Layout::layout_group<32, false>(Symbol_table* symtab,
+ Sized_relobj<32, false>* object,
+ unsigned int,
+ const char* group_section_name,
+ const char* signature,
+ const elfcpp::Shdr<32, false>& shdr,
+ const elfcpp::Elf_Word* contents);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Layout::layout_group<32, true>(Symbol_table* symtab,
+ Sized_relobj<32, true>* object,
+ unsigned int,
+ const char* group_section_name,
+ const char* signature,
+ const elfcpp::Shdr<32, true>& shdr,
+ const elfcpp::Elf_Word* contents);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Layout::layout_group<64, false>(Symbol_table* symtab,
+ Sized_relobj<64, false>* object,
+ unsigned int,
+ const char* group_section_name,
+ const char* signature,
+ const elfcpp::Shdr<64, false>& shdr,
+ const elfcpp::Elf_Word* contents);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Layout::layout_group<64, true>(Symbol_table* symtab,
+ Sized_relobj<64, true>* object,
+ unsigned int,
+ const char* group_section_name,
+ const char* signature,
+ const elfcpp::Shdr<64, true>& shdr,
+ const elfcpp::Elf_Word* contents);
+#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,
projects / external / binutils.git / blobdiff