#include "gold.h"
+#include <cerrno>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <utility>
+#include <fcntl.h>
+#include <unistd.h>
+#include "libiberty.h"
+#include "md5.h"
+#include "sha1.h"
#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
{
off_t file_size = this->layout_->finalize(this->input_objects_,
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(parameters->output_file_name());
+ 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.
: 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),
+ unattached_section_list_(), sections_are_attached_(false),
+ 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), eh_frame_data_(NULL),
+ added_eh_frame_data_(false), eh_frame_hdr_section_(NULL),
+ build_id_note_(NULL), group_signatures_(), output_file_size_(-1),
input_requires_executable_stack_(false),
input_with_gnu_stack_note_(false),
input_without_gnu_stack_note_(false),
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);
+ elfcpp::Elf_Xword lookup_flags = flags;
+
+ // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine
+ // read-write with read-only sections. Some other ELF linkers do
+ // not do this. FIXME: Perhaps there should be an option
+ // controlling this.
+ lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR);
- const Key key(name_key, std::make_pair(type, flags));
+ const Key key(name_key, std::make_pair(type, lookup_flags));
const std::pair<Key, Output_section*> v(key, NULL);
std::pair<Section_name_map::iterator, bool> ins(
this->section_name_map_.insert(v));
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. For compatibility with the GNU linker, we
+ // combine sections with contents and zero flags with sections
+ // with non-zero flags. This is a workaround for cases where
+ // assembler code forgets to set section flags. FIXME: Perhaps
+ // there should be an option to control this.
+ Output_section* os = NULL;
+
+ if (type == elfcpp::SHT_PROGBITS)
+ {
+ if (flags == 0)
+ {
+ Output_section* same_name = this->find_output_section(name);
+ if (same_name != NULL
+ && same_name->type() == elfcpp::SHT_PROGBITS
+ && (same_name->flags() & elfcpp::SHF_TLS) == 0)
+ os = same_name;
+ }
+ else if ((flags & elfcpp::SHF_TLS) == 0)
+ {
+ elfcpp::Elf_Xword zero_flags = 0;
+ const Key zero_key(name_key, std::make_pair(type, zero_flags));
+ Section_name_map::iterator p =
+ this->section_name_map_.find(zero_key);
+ if (p != this->section_name_map_.end())
+ os = p->second;
+ }
+ }
+
+ 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. IS_INPUT_SECTION is true if we are
+// choosing an output section for an input section found in a input
+// file. 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 is_input_section)
+{
+ // We should not see any input sections after we have attached
+ // sections to segments.
+ gold_assert(!is_input_section || !this->sections_are_attached_);
+
+ // Some flags in the input section should not be automatically
+ // copied to the output section.
+ 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 (is_input_section && !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);
-
- // FIXME: Handle SHF_OS_NONCONFORMING here.
+ Output_section* os;
- // Canonicalize the section name.
- Stringpool::Key name_key;
- name = this->namepool_.add_with_length(name, len, true, &name_key);
+ // 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;
+ }
- // 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());
+ // By default the GNU linker sorts input sections whose names match
+ // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections
+ // are sorted by name. This is used to implement constructor
+ // priority ordering. We are compatible.
+ if (!this->script_options_->saw_sections_clause()
+ && (is_prefix_of(".ctors.", name)
+ || is_prefix_of(".dtors.", name)
+ || is_prefix_of(".init_array.", name)
+ || is_prefix_of(".fini_array.", name)))
+ os->set_must_sort_attached_input_sections();
// FIXME: Handle SHF_LINK_ORDER somewhere.
- *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx);
+ *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx,
+ this->script_options_->saw_sections_clause());
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);
+
+ 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/).
off_t* off)
{
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);
+ gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0);
- 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_section_ = os;
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);
+ }
}
}
shndx,
reloc_shndx,
reloc_type))
- *off = -1;
+ {
+ os->update_flags_for_input_section(shdr.get_sh_flags());
+
+ // We found a .eh_frame section we are going to optimize, so now
+ // we can add the set of optimized sections to the output
+ // section. We need to postpone adding this until we've found a
+ // section we can optimize so that the .eh_frame section in
+ // crtbegin.o winds up at the start of the output section.
+ if (!this->added_eh_frame_data_)
+ {
+ os->add_output_section_data(this->eh_frame_data_);
+ this->added_eh_frame_data_ = true;
+ }
+ *off = -1;
+ }
else
{
// 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.
{
Output_section* os;
if ((flags & elfcpp::SHF_ALLOC) == 0
- && this->options_.compress_debug_sections()
+ && strcmp(this->options_.compress_debug_sections(), "none") != 0
&& is_compressible_debug_section(name))
os = new Output_compressed_section(&this->options_, name, type, flags);
else
this->section_list_.push_back(os);
- if ((flags & elfcpp::SHF_ALLOC) == 0)
+ // The GNU linker by default sorts some sections by priority, so we
+ // do the same. We need to know that this might happen before we
+ // attach any input sections.
+ if (!this->script_options_->saw_sections_clause()
+ && (strcmp(name, ".ctors") == 0
+ || strcmp(name, ".dtors") == 0
+ || strcmp(name, ".init_array") == 0
+ || strcmp(name, ".fini_array") == 0))
+ os->set_may_sort_attached_input_sections();
+
+ // If we have already attached the sections to segments, then we
+ // need to attach this one now. This happens for sections created
+ // directly by the linker.
+ if (this->sections_are_attached_)
+ this->attach_section_to_segment(os);
+
+ return os;
+}
+
+// Attach output sections to segments. This is called after we have
+// seen all the input sections.
+
+void
+Layout::attach_sections_to_segments()
+{
+ for (Section_list::iterator p = this->section_list_.begin();
+ p != this->section_list_.end();
+ ++p)
+ this->attach_section_to_segment(*p);
+
+ this->sections_are_attached_ = true;
+}
+
+// Attach an output section to a segment.
+
+void
+Layout::attach_section_to_segment(Output_section* os)
+{
+ if ((os->flags() & elfcpp::SHF_ALLOC) == 0)
this->unattached_section_list_.push_back(os);
else
+ this->attach_allocated_section_to_segment(os);
+}
+
+// Attach an allocated output section to a segment.
+
+void
+Layout::attach_allocated_section_to_segment(Output_section* os)
+{
+ elfcpp::Elf_Xword flags = os->flags();
+ gold_assert((flags & elfcpp::SHF_ALLOC) != 0);
+
+ if (parameters->options().relocatable())
+ return;
+
+ // 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;
+
+ 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);
+
+ // 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();
+ p != this->segment_list_.end();
+ ++p)
{
- // 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))
+ {
+ // If -Tbss was specified, we need to separate the data
+ // and BSS segments.
+ if (this->options_.user_set_Tbss())
+ {
+ if ((os->type() == elfcpp::SHT_NOBITS)
+ == (*p)->has_any_data_sections())
+ continue;
+ }
- elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags);
+ (*p)->add_output_section(os, seg_flags);
+ break;
+ }
+ }
- // 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.
+ if (p == this->segment_list_.end())
+ {
+ Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD,
+ seg_flags);
+ oseg->add_output_section(os, seg_flags);
+ }
- Segment_list::const_iterator p;
+ // If we see a loadable SHT_NOTE section, we create a PT_NOTE
+ // segment.
+ if (os->type() == elfcpp::SHT_NOTE)
+ {
+ // See if we already have an equivalent PT_NOTE segment.
for (p = this->segment_list_.begin();
- p != this->segment_list_.end();
- ++p)
- {
- if ((*p)->type() == elfcpp::PT_LOAD
- && ((*p)->flags() & elfcpp::PF_W) == (seg_flags & elfcpp::PF_W))
- {
- (*p)->add_output_section(os, seg_flags);
- break;
- }
- }
+ p != segment_list_.end();
+ ++p)
+ {
+ if ((*p)->type() == elfcpp::PT_NOTE
+ && (((*p)->flags() & elfcpp::PF_W)
+ == (seg_flags & elfcpp::PF_W)))
+ {
+ (*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);
- oseg->add_output_section(os, seg_flags);
- }
-
- // If we see a loadable SHT_NOTE section, we create a PT_NOTE
- // segment.
- if (type == elfcpp::SHT_NOTE)
- {
- // See if we already have an equivalent PT_NOTE segment.
- for (p = this->segment_list_.begin();
- p != segment_list_.end();
- ++p)
- {
- if ((*p)->type() == elfcpp::PT_NOTE
- && (((*p)->flags() & elfcpp::PF_W)
- == (seg_flags & elfcpp::PF_W)))
- {
- (*p)->add_output_section(os, seg_flags);
- break;
- }
- }
-
- if (p == this->segment_list_.end())
- {
- Output_segment* oseg = new Output_segment(elfcpp::PT_NOTE,
- seg_flags);
- this->segment_list_.push_back(oseg);
- oseg->add_output_section(os, seg_flags);
- }
- }
+ {
+ Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE,
+ seg_flags);
+ oseg->add_output_section(os, seg_flags);
+ }
+ }
- // If we see a loadable SHF_TLS section, we create a PT_TLS
- // segment. There can only be one such segment.
- 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_->add_output_section(os, seg_flags);
- }
+ // If we see a loadable SHF_TLS section, we create a PT_TLS
+ // segment. There can only be one such segment.
+ if ((flags & elfcpp::SHF_TLS) != 0)
+ {
+ if (this->tls_segment_ == NULL)
+ this->tls_segment_ = this->make_output_segment(elfcpp::PT_TLS,
+ seg_flags);
+ this->tls_segment_->add_output_section(os, seg_flags);
}
+}
+// 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
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("_DYNAMIC", NULL, this->dynamic_section_, 0, 0,
elfcpp::STT_OBJECT, elfcpp::STB_LOCAL,
elfcpp::STV_DEFAULT,
0, // nonvis
false, // offset_is_from_end
- false); // only_if_ref
+ true); // only_if_ref
symtab->define_in_output_data(stop_name.c_str(),
NULL, // version
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
// necessary.
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;
}
off_t
Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab,
- const Task* task)
+ 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);
+ this->create_build_id();
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->options_, &this->dynpool_);
+ 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,
- this->script_options_->entry());
- load_seg->add_initial_output_data(file_header);
+ 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
return off;
}
-// Create a .note section for an executable or shared library. This
-// records the version of gold used to create the binary.
+// Create a note header following the format defined in the ELF ABI.
+// NAME is the name, NOTE_TYPE is the type, DESCSZ is the size of the
+// descriptor. ALLOCATE is true if the section should be allocated in
+// memory. This returns the new note section. It sets
+// *TRAILING_PADDING to the number of trailing zero bytes required.
-void
-Layout::create_gold_note()
+Output_section*
+Layout::create_note(const char* name, int note_type, size_t descsz,
+ bool allocate, size_t* trailing_padding)
{
- 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.
// .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
// 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;
+ size_t notehdrsz = 3 * (size / 8) + aligned_namesz;
- unsigned char buffer[128];
- gold_assert(sizeof buffer >= notesz);
- memset(buffer, 0, notesz);
+ unsigned char* buffer = new unsigned char[notehdrsz];
+ memset(buffer, 0, notehdrsz);
- bool is_big_endian = parameters->is_big_endian();
+ bool is_big_endian = parameters->target().is_big_endian();
if (size == 32)
{
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);
+ elfcpp::Elf_Xword flags = 0;
+ if (allocate)
+ flags = elfcpp::SHF_ALLOC;
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);
+ flags);
+ Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz,
+ size / 8);
os->add_output_section_data(posd);
+
+ *trailing_padding = aligned_descsz - descsz;
+
+ return os;
+}
+
+// For an executable or shared library, create a note to record the
+// version of gold used to create the binary.
+
+void
+Layout::create_gold_note()
+{
+ if (parameters->options().relocatable())
+ return;
+
+ std::string desc = std::string("gold ") + gold::get_version_string();
+
+ size_t trailing_padding;
+ Output_section *os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION,
+ desc.size(), false, &trailing_padding);
+
+ Output_section_data* posd = new Output_data_const(desc, 4);
+ os->add_output_section_data(posd);
+
+ if (trailing_padding > 0)
+ {
+ posd = new Output_data_fixed_space(trailing_padding, 0);
+ os->add_output_section_data(posd);
+ }
}
// Record whether the stack should be executable. This can be set
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);
+ }
+}
+
+// If --build-id was used, set up the build ID note.
+
+void
+Layout::create_build_id()
+{
+ if (!parameters->options().user_set_build_id())
+ return;
+
+ const char* style = parameters->options().build_id();
+ if (strcmp(style, "none") == 0)
+ return;
+
+ // Set DESCSZ to the size of the note descriptor. When possible,
+ // set DESC to the note descriptor contents.
+ size_t descsz;
+ std::string desc;
+ if (strcmp(style, "md5") == 0)
+ descsz = 128 / 8;
+ else if (strcmp(style, "sha1") == 0)
+ descsz = 160 / 8;
+ else if (strcmp(style, "uuid") == 0)
+ {
+ const size_t uuidsz = 128 / 8;
+
+ char buffer[uuidsz];
+ memset(buffer, 0, uuidsz);
+
+ int descriptor = ::open("/dev/urandom", O_RDONLY);
+ if (descriptor < 0)
+ gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"),
+ strerror(errno));
+ else
+ {
+ ssize_t got = ::read(descriptor, buffer, uuidsz);
+ ::close(descriptor);
+ if (got < 0)
+ gold_error(_("/dev/urandom: read failed: %s"), strerror(errno));
+ else if (static_cast<size_t>(got) != uuidsz)
+ gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"),
+ uuidsz, got);
+ }
+
+ desc.assign(buffer, uuidsz);
+ descsz = uuidsz;
+ }
+ else if (strncmp(style, "0x", 2) == 0)
+ {
+ hex_init();
+ const char* p = style + 2;
+ while (*p != '\0')
+ {
+ if (hex_p(p[0]) && hex_p(p[1]))
+ {
+ char c = (hex_value(p[0]) << 4) | hex_value(p[1]);
+ desc += c;
+ p += 2;
+ }
+ else if (*p == '-' || *p == ':')
+ ++p;
+ else
+ gold_fatal(_("--build-id argument '%s' not a valid hex number"),
+ style);
+ }
+ descsz = desc.size();
+ }
+ else
+ gold_fatal(_("unrecognized --build-id argument '%s'"), style);
+
+ // Create the note.
+ size_t trailing_padding;
+ Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID,
+ descsz, true, &trailing_padding);
+
+ if (!desc.empty())
+ {
+ // We know the value already, so we fill it in now.
+ gold_assert(desc.size() == descsz);
+
+ Output_section_data* posd = new Output_data_const(desc, 4);
+ os->add_output_section_data(posd);
+
+ if (trailing_padding != 0)
+ {
+ posd = new Output_data_fixed_space(trailing_padding, 0);
+ os->add_output_section_data(posd);
+ }
+ }
+ else
+ {
+ // We need to compute a checksum after we have completed the
+ // link.
+ gold_assert(trailing_padding == 0);
+ this->build_id_note_ = new Output_data_fixed_space(descsz, 4);
+ os->add_output_section_data(this->build_id_note_);
+ os->set_after_input_sections();
}
}
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 (parameters->output_is_shared())
+ if (this->options_.user_set_Ttext())
+ addr = this->options_.Ttext();
+ else if (parameters->options().shared())
addr = 0;
- else if (options_.user_set_text_segment_address())
- addr = options_.text_segment_address();
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(this, 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(this, true, addr,
+ &off, pshndx);
}
}
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;
+}
+
// Set the file offset of all the sections not associated with a
// segment.
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.
{
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;
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());
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);
// Create the hash tables.
- // FIXME: We need an option to create a GNU hash table.
+ if (strcmp(parameters->options().hash_style(), "sysv") == 0
+ || strcmp(parameters->options().hash_style(), "both") == 0)
+ {
+ unsigned char* phash;
+ unsigned int hashlen;
+ Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount,
+ &phash, &hashlen);
+
+ 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,
+ align);
+ hashsec->add_output_section_data(hashdata);
+
+ hashsec->set_link_section(dynsym);
+ hashsec->set_entsize(4);
- unsigned char* phash;
- unsigned int hashlen;
- Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount,
- &phash, &hashlen);
+ odyn->add_section_address(elfcpp::DT_HASH, hashsec);
+ }
+
+ if (strcmp(parameters->options().hash_style(), "gnu") == 0
+ || strcmp(parameters->options().hash_style(), "both") == 0)
+ {
+ unsigned char* phash;
+ unsigned int hashlen;
+ Dynobj::create_gnu_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, ".gnu.hash",
+ elfcpp::SHT_GNU_HASH,
+ elfcpp::SHF_ALLOC,
+ false);
- Output_section_data* hashdata = new Output_data_const_buffer(phash,
- hashlen,
- align);
- hashsec->add_output_section_data(hashdata);
+ 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);
+ hashsec->set_link_section(dynsym);
+ hashsec->set_entsize(4);
- odyn->add_section_address(elfcpp::DT_HASH, hashsec);
+ odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec);
+ }
}
// Assign offsets to each local portion of the dynamic symbol table.
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->output_is_shared())
+ if (parameters->options().shared())
{
const char* soname = this->options_.soname();
if (soname != NULL)
// 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
odyn->add_constant(elfcpp::DT_TEXTREL, 0);
flags |= elfcpp::DF_TEXTREL;
}
- if (parameters->output_is_shared() && this->has_static_tls())
+ 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();
this->section_headers_->write(of);
}
+// If the build ID requires computing a checksum, do so here, and
+// write it out. We compute a checksum over the entire file because
+// that is simplest.
+
+void
+Layout::write_build_id(Output_file* of) const
+{
+ if (this->build_id_note_ == NULL)
+ return;
+
+ const unsigned char* iv = of->get_input_view(0, this->output_file_size_);
+
+ unsigned char* ov = of->get_output_view(this->build_id_note_->offset(),
+ this->build_id_note_->data_size());
+
+ const char* style = parameters->options().build_id();
+ if (strcmp(style, "sha1") == 0)
+ {
+ sha1_ctx ctx;
+ sha1_init_ctx(&ctx);
+ sha1_process_bytes(iv, this->output_file_size_, &ctx);
+ sha1_finish_ctx(&ctx, ov);
+ }
+ else if (strcmp(style, "md5") == 0)
+ {
+ md5_ctx ctx;
+ md5_init_ctx(&ctx);
+ md5_process_bytes(iv, this->output_file_size_, &ctx);
+ md5_finish_ctx(&ctx, ov);
+ }
+ else
+ gold_unreachable();
+
+ of->write_output_view(this->build_id_note_->offset(),
+ this->build_id_note_->data_size(),
+ ov);
+
+ of->free_input_view(0, this->output_file_size_, iv);
+}
+
+// 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)->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;
+ }
+ }
+
+ 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.
void
void
Close_task_runner::run(Workqueue*, const Task*)
{
+ // If we need to compute a checksum for the BUILD if, we do so here.
+ this->layout_->write_build_id(this->of_);
+
+ // 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();
}
unsigned int, unsigned int, off_t*);
#endif
+#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*
projects / deliverable / binutils-gdb.git / blobdiff