// output.cc -- manage the output file for gold
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
else
gold_unreachable();
- if (dynamic)
- os->set_should_link_to_dynsym();
- else
+
+ // A STT_GNU_IFUNC symbol may require a IRELATIVE reloc when doing a
+ // static link. The backends will generate a dynamic reloc section
+ // to hold this. In that case we don't want to link to the dynsym
+ // section, because there isn't one.
+ if (!dynamic)
os->set_should_link_to_symtab();
+ else if (parameters->doing_static_link())
+ ;
+ else
+ os->set_should_link_to_dynsym();
}
// Write out relocation data.
// link-time value, which will be relocated dynamically by a
// RELATIVE relocation.
Symbol* gsym = this->u_.gsym;
- Sized_symbol<size>* sgsym;
- // This cast is a bit ugly. We don't want to put a
- // virtual method in Symbol, because we want Symbol to be
- // as small as possible.
- sgsym = static_cast<Sized_symbol<size>*>(gsym);
- val = sgsym->value();
+ if (this->use_plt_offset_ && gsym->has_plt_offset())
+ val = (parameters->target().plt_section_for_global(gsym)->address()
+ + gsym->plt_offset());
+ else
+ {
+ Sized_symbol<size>* sgsym;
+ // This cast is a bit ugly. We don't want to put a
+ // virtual method in Symbol, because we want Symbol to be
+ // as small as possible.
+ sgsym = static_cast<Sized_symbol<size>*>(gsym);
+ val = sgsym->value();
+ }
}
break;
default:
{
+ const Sized_relobj<size, big_endian>* object = this->u_.object;
const unsigned int lsi = this->local_sym_index_;
- const Symbol_value<size>* symval = this->u_.object->local_symbol(lsi);
- val = symval->value(this->u_.object, 0);
+ const Symbol_value<size>* symval = object->local_symbol(lsi);
+ if (!this->use_plt_offset_)
+ val = symval->value(this->u_.object, 0);
+ else
+ {
+ const Output_data* plt =
+ parameters->target().plt_section_for_local(object, lsi);
+ val = plt->address() + object->local_plt_offset(lsi);
+ }
}
break;
}
if (gsym->has_got_offset(got_type))
return false;
- this->entries_.push_back(Got_entry(gsym));
+ this->entries_.push_back(Got_entry(gsym, false));
+ this->set_got_size();
+ gsym->set_got_offset(got_type, this->last_got_offset());
+ return true;
+}
+
+// Like add_global, but use the PLT offset.
+
+template<int size, bool big_endian>
+bool
+Output_data_got<size, big_endian>::add_global_plt(Symbol* gsym,
+ unsigned int got_type)
+{
+ if (gsym->has_got_offset(got_type))
+ return false;
+
+ this->entries_.push_back(Got_entry(gsym, true));
this->set_got_size();
gsym->set_got_offset(got_type, this->last_got_offset());
return true;
// Add an entry for a global symbol to the GOT, and add a dynamic
// relocation of type R_TYPE for the GOT entry.
+
template<int size, bool big_endian>
void
Output_data_got<size, big_endian>::add_global_with_rel(
if (object->local_has_got_offset(symndx, got_type))
return false;
- this->entries_.push_back(Got_entry(object, symndx));
+ this->entries_.push_back(Got_entry(object, symndx, false));
+ this->set_got_size();
+ object->set_local_got_offset(symndx, got_type, this->last_got_offset());
+ return true;
+}
+
+// Like add_local, but use the PLT offset.
+
+template<int size, bool big_endian>
+bool
+Output_data_got<size, big_endian>::add_local_plt(
+ Sized_relobj<size, big_endian>* object,
+ unsigned int symndx,
+ unsigned int got_type)
+{
+ if (object->local_has_got_offset(symndx, got_type))
+ return false;
+
+ this->entries_.push_back(Got_entry(object, symndx, true));
this->set_got_size();
object->set_local_got_offset(symndx, got_type, this->last_got_offset());
return true;
// Add an entry for a local symbol to the GOT, and add a dynamic
// relocation of type R_TYPE for the GOT entry.
+
template<int size, bool big_endian>
void
Output_data_got<size, big_endian>::add_local_with_rel(
Output_section* os = object->output_section(shndx);
rel_dyn->add_output_section(os, r_type_1, this, got_offset);
- this->entries_.push_back(Got_entry(object, symndx));
+ this->entries_.push_back(Got_entry(object, symndx, false));
if (r_type_2 != 0)
{
got_offset = this->last_got_offset();
Output_section* os = object->output_section(shndx);
rela_dyn->add_output_section(os, r_type_1, this, got_offset, 0);
- this->entries_.push_back(Got_entry(object, symndx));
+ this->entries_.push_back(Got_entry(object, symndx, false));
if (r_type_2 != 0)
{
got_offset = this->last_got_offset();
const Relobj* object,
unsigned int shndx,
section_offset_type offset,
- section_offset_type *poutput) const
+ section_offset_type* poutput) const
{
if (!this->is_input_section())
return this->u2_.posd->output_offset(object, shndx, offset, poutput);
info_(0),
type_(type),
flags_(flags),
+ order_(ORDER_INVALID),
out_shndx_(-1U),
symtab_index_(0),
dynsym_index_(0),
found_in_sections_clause_(false),
has_load_address_(false),
info_uses_section_index_(false),
+ input_section_order_specified_(false),
may_sort_attached_input_sections_(false),
must_sort_attached_input_sections_(false),
attached_input_sections_are_sorted_(false),
is_relro_(false),
- is_relro_local_(false),
- is_last_relro_(false),
- is_first_non_relro_(false),
is_small_section_(false),
is_large_section_(false),
- is_interp_(false),
- is_dynamic_linker_section_(false),
generate_code_fills_at_write_(false),
is_entsize_zero_(false),
section_offsets_need_adjustment_(false),
is_noload_(false),
+ always_keeps_input_sections_(false),
tls_offset_(0),
checkpoint_(NULL),
lookup_maps_(new Output_section_lookup_maps)
template<int size, bool big_endian>
off_t
-Output_section::add_input_section(Sized_relobj<size, big_endian>* object,
+Output_section::add_input_section(Layout* layout,
+ Sized_relobj<size, big_endian>* object,
unsigned int shndx,
const char* secname,
const elfcpp::Shdr<size, big_endian>& shdr,
{
// Keep information about merged input sections for rebuilding fast
// lookup maps if we have sections-script or we do relaxation.
- bool keeps_input_sections =
- have_sections_script || parameters->target().may_relax();
+ bool keeps_input_sections = (this->always_keeps_input_sections_
+ || have_sections_script
+ || parameters->target().may_relax());
+
if (this->add_merge_input_section(object, shndx, sh_flags, entsize,
addralign, keeps_input_sections))
{
}
}
+ section_size_type input_section_size = shdr.get_sh_size();
+ section_size_type uncompressed_size;
+ if (object->section_is_compressed(shndx, &uncompressed_size))
+ input_section_size = uncompressed_size;
+
this->set_current_data_size_for_child(aligned_offset_in_section
- + shdr.get_sh_size());
+ + input_section_size);
// We need to keep track of this section if we are already keeping
// track of sections, or if we are relaxing. Also, if this is a
// section which requires sorting, or which may require sorting in
- // the future, we keep track of the sections.
- if (have_sections_script
+ // the future, we keep track of the sections. If the
+ // --section-ordering-file option is used to specify the order of
+ // sections, we need to keep track of sections.
+ if (this->always_keeps_input_sections_
+ || have_sections_script
|| !this->input_sections_.empty()
|| this->may_sort_attached_input_sections()
|| this->must_sort_attached_input_sections()
|| parameters->options().user_set_Map()
- || parameters->target().may_relax())
- this->input_sections_.push_back(Input_section(object, shndx,
- shdr.get_sh_size(),
- addralign));
+ || parameters->target().may_relax()
+ || parameters->options().section_ordering_file())
+ {
+ Input_section isecn(object, shndx, input_section_size, addralign);
+ if (parameters->options().section_ordering_file())
+ {
+ unsigned int section_order_index =
+ layout->find_section_order_index(std::string(secname));
+ if (section_order_index != 0)
+ {
+ isecn.set_section_order_index(section_order_index);
+ this->set_input_section_order_specified();
+ }
+ }
+ this->input_sections_.push_back(isecn);
+ }
return aligned_offset_in_section;
}
// Add a relaxed input section.
void
-Output_section::add_relaxed_input_section(Output_relaxed_input_section* poris)
+Output_section::add_relaxed_input_section(Layout* layout,
+ Output_relaxed_input_section* poris,
+ const std::string& name)
{
Input_section inp(poris);
+
+ // If the --section-ordering-file option is used to specify the order of
+ // sections, we need to keep track of sections.
+ if (parameters->options().section_ordering_file())
+ {
+ unsigned int section_order_index =
+ layout->find_section_order_index(name);
+ if (section_order_index != 0)
+ {
+ inp.set_section_order_index(section_order_index);
+ this->set_input_section_order_specified();
+ }
+ }
+
this->add_output_section_data(&inp);
if (this->lookup_maps_->is_valid())
this->lookup_maps_->add_relaxed_input_section(poris->relobj(),
Relaxation_map::const_iterator p = map.find(sid);
gold_assert(p != map.end());
gold_assert((*input_sections)[p->second].is_input_section());
+
+ // Remember section order index of original input section
+ // if it is set. Copy it to the relaxed input section.
+ unsigned int soi =
+ (*input_sections)[p->second].section_order_index();
(*input_sections)[p->second] = Input_section(poris);
+ (*input_sections)[p->second].set_section_order_index(soi);
}
}
return;
}
- if (this->must_sort_attached_input_sections())
+ if (this->must_sort_attached_input_sections()
+ || this->input_section_order_specified())
this->sort_attached_input_sections();
uint64_t address = this->address();
{ }
Input_section_sort_entry(const Input_section& input_section,
- unsigned int index)
+ unsigned int index,
+ bool must_sort_attached_input_sections)
: input_section_(input_section), index_(index),
section_has_name_(input_section.is_input_section()
|| input_section.is_relaxed_input_section())
{
- if (this->section_has_name_)
+ if (this->section_has_name_
+ && must_sort_attached_input_sections)
{
// This is only called single-threaded from Layout::finalize,
// so it is OK to lock. Unfortunately we have no way to pass
return memcmp(base_name + base_len - 2, ".o", 2) == 0;
}
+ // Returns 1 if THIS should appear before S in section order, -1 if S
+ // appears before THIS and 0 if they are not comparable.
+ int
+ compare_section_ordering(const Input_section_sort_entry& s) const
+ {
+ unsigned int this_secn_index = this->input_section_.section_order_index();
+ unsigned int s_secn_index = s.input_section().section_order_index();
+ if (this_secn_index > 0 && s_secn_index > 0)
+ {
+ if (this_secn_index < s_secn_index)
+ return 1;
+ else if (this_secn_index > s_secn_index)
+ return -1;
+ }
+ return 0;
+ }
+
private:
// The Input_section we are sorting.
Input_section input_section_;
if (!s1_has_priority && s2_has_priority)
return true;
+ // Check if a section order exists for these sections through a section
+ // ordering file. If sequence_num is 0, an order does not exist.
+ int sequence_num = s1.compare_section_ordering(s2);
+ if (sequence_num != 0)
+ return sequence_num == 1;
+
// Otherwise we sort by name.
int compare = s1.section_name().compare(s2.section_name());
if (compare != 0)
if (!s1_has_priority && s2_has_priority)
return false;
+ // Check if a section order exists for these sections through a section
+ // ordering file. If sequence_num is 0, an order does not exist.
+ int sequence_num = s1.compare_section_ordering(s2);
+ if (sequence_num != 0)
+ return sequence_num == 1;
+
// Otherwise we sort by name.
int compare = s1.section_name().compare(s2.section_name());
if (compare != 0)
return s1.index() < s2.index();
}
+// Return true if S1 should come before S2. Sections that do not match
+// any pattern in the section ordering file are placed ahead of the sections
+// that match some pattern.
+
+bool
+Output_section::Input_section_sort_section_order_index_compare::operator()(
+ const Output_section::Input_section_sort_entry& s1,
+ const Output_section::Input_section_sort_entry& s2) const
+{
+ unsigned int s1_secn_index = s1.input_section().section_order_index();
+ unsigned int s2_secn_index = s2.input_section().section_order_index();
+
+ // Keep input order if section ordering cannot determine order.
+ if (s1_secn_index == s2_secn_index)
+ return s1.index() < s2.index();
+
+ return s1_secn_index < s2_secn_index;
+}
+
// Sort the input sections attached to an output section.
void
for (Input_section_list::iterator p = this->input_sections_.begin();
p != this->input_sections_.end();
++p, ++i)
- sort_list.push_back(Input_section_sort_entry(*p, i));
+ sort_list.push_back(Input_section_sort_entry(*p, i,
+ this->must_sort_attached_input_sections()));
// Sort the input sections.
- if (this->type() == elfcpp::SHT_PREINIT_ARRAY
- || this->type() == elfcpp::SHT_INIT_ARRAY
- || this->type() == elfcpp::SHT_FINI_ARRAY)
- std::sort(sort_list.begin(), sort_list.end(),
- Input_section_sort_init_fini_compare());
+ if (this->must_sort_attached_input_sections())
+ {
+ if (this->type() == elfcpp::SHT_PREINIT_ARRAY
+ || this->type() == elfcpp::SHT_INIT_ARRAY
+ || this->type() == elfcpp::SHT_FINI_ARRAY)
+ std::sort(sort_list.begin(), sort_list.end(),
+ Input_section_sort_init_fini_compare());
+ else
+ std::sort(sort_list.begin(), sort_list.end(),
+ Input_section_sort_compare());
+ }
else
- std::sort(sort_list.begin(), sort_list.end(),
- Input_section_sort_compare());
+ {
+ gold_assert(parameters->options().section_ordering_file());
+ std::sort(sort_list.begin(), sort_list.end(),
+ Input_section_sort_section_order_index_compare());
+ }
// Copy the sorted input sections back to our list.
this->input_sections_.clear();
p != sort_list.end();
++p)
this->input_sections_.push_back(p->input_section());
+ sort_list.clear();
// Remember that we sorted the input sections, since we might get
// called again.
// Output segment methods.
Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
- : output_data_(),
- output_bss_(),
- vaddr_(0),
+ : vaddr_(0),
paddr_(0),
memsz_(0),
max_align_(0),
this->flags_ = elfcpp::PF_R;
}
-// Add an Output_section to an Output_segment.
+// Add an Output_section to a PT_LOAD Output_segment.
void
-Output_segment::add_output_section(Output_section* os,
- elfcpp::Elf_Word seg_flags,
- bool do_sort)
+Output_segment::add_output_section_to_load(Layout* layout,
+ Output_section* os,
+ elfcpp::Elf_Word seg_flags)
{
+ gold_assert(this->type() == elfcpp::PT_LOAD);
gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
gold_assert(!this->is_max_align_known_);
gold_assert(os->is_large_data_section() == this->is_large_data_segment());
- gold_assert(this->type() == elfcpp::PT_LOAD || !do_sort);
this->update_flags_for_output_section(seg_flags);
- Output_segment::Output_data_list* pdl;
- if (os->type() == elfcpp::SHT_NOBITS)
- pdl = &this->output_bss_;
+ // We don't want to change the ordering if we have a linker script
+ // with a SECTIONS clause.
+ Output_section_order order = os->order();
+ if (layout->script_options()->saw_sections_clause())
+ order = static_cast<Output_section_order>(0);
else
- pdl = &this->output_data_;
-
- // Note that while there may be many input sections in an output
- // section, there are normally only a few output sections in an
- // output segment. The loops below are expected to be fast.
-
- // So that PT_NOTE segments will work correctly, we need to ensure
- // that all SHT_NOTE sections are adjacent.
- if (os->type() == elfcpp::SHT_NOTE && !pdl->empty())
- {
- Output_segment::Output_data_list::iterator p = pdl->end();
- do
- {
- --p;
- if ((*p)->is_section_type(elfcpp::SHT_NOTE))
- {
- ++p;
- pdl->insert(p, os);
- return;
- }
- }
- while (p != pdl->begin());
- }
-
- // Similarly, so that PT_TLS segments will work, we need to group
- // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
- // case: we group the SHF_TLS/SHT_NOBITS sections right after the
- // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
- // correctly. SHF_TLS sections get added to both a PT_LOAD segment
- // and the PT_TLS segment; we do this grouping only for the PT_LOAD
- // segment.
- if (this->type_ != elfcpp::PT_TLS
- && (os->flags() & elfcpp::SHF_TLS) != 0)
- {
- pdl = &this->output_data_;
- if (!pdl->empty())
- {
- bool nobits = os->type() == elfcpp::SHT_NOBITS;
- bool sawtls = false;
- Output_segment::Output_data_list::iterator p = pdl->end();
- gold_assert(p != pdl->begin());
- do
- {
- --p;
- bool insert;
- if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
- {
- sawtls = true;
- // Put a NOBITS section after the first TLS section.
- // Put a PROGBITS section after the first
- // TLS/PROGBITS section.
- insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS);
- }
- else
- {
- // If we've gone past the TLS sections, but we've
- // seen a TLS section, then we need to insert this
- // section now.
- insert = sawtls;
- }
-
- if (insert)
- {
- ++p;
- pdl->insert(p, os);
- return;
- }
- }
- while (p != pdl->begin());
- }
-
- // There are no TLS sections yet; put this one at the requested
- // location in the section list.
- }
-
- if (do_sort)
- {
- // For the PT_GNU_RELRO segment, we need to group relro
- // sections, and we need to put them before any non-relro
- // sections. Any relro local sections go before relro non-local
- // sections. One section may be marked as the last relro
- // section.
- if (os->is_relro())
- {
- gold_assert(pdl == &this->output_data_);
- Output_segment::Output_data_list::iterator p;
- for (p = pdl->begin(); p != pdl->end(); ++p)
- {
- if (!(*p)->is_section())
- break;
+ gold_assert(order != ORDER_INVALID);
- Output_section* pos = (*p)->output_section();
- if (!pos->is_relro()
- || (os->is_relro_local() && !pos->is_relro_local())
- || (!os->is_last_relro() && pos->is_last_relro()))
- break;
- }
-
- pdl->insert(p, os);
- return;
- }
+ this->output_lists_[order].push_back(os);
+}
- // One section may be marked as the first section which follows
- // the relro sections.
- if (os->is_first_non_relro())
- {
- gold_assert(pdl == &this->output_data_);
- Output_segment::Output_data_list::iterator p;
- for (p = pdl->begin(); p != pdl->end(); ++p)
- {
- if (!(*p)->is_section())
- break;
+// Add an Output_section to a non-PT_LOAD Output_segment.
- Output_section* pos = (*p)->output_section();
- if (!pos->is_relro())
- break;
- }
+void
+Output_segment::add_output_section_to_nonload(Output_section* os,
+ elfcpp::Elf_Word seg_flags)
+{
+ gold_assert(this->type() != elfcpp::PT_LOAD);
+ gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
+ gold_assert(!this->is_max_align_known_);
- pdl->insert(p, os);
- return;
- }
- }
+ this->update_flags_for_output_section(seg_flags);
- // Small data sections go at the end of the list of data sections.
- // If OS is not small, and there are small sections, we have to
- // insert it before the first small section.
- if (os->type() != elfcpp::SHT_NOBITS
- && !os->is_small_section()
- && !pdl->empty()
- && pdl->back()->is_section()
- && pdl->back()->output_section()->is_small_section())
- {
- for (Output_segment::Output_data_list::iterator p = pdl->begin();
- p != pdl->end();
- ++p)
- {
- if ((*p)->is_section()
- && (*p)->output_section()->is_small_section())
- {
- pdl->insert(p, os);
- return;
- }
- }
- gold_unreachable();
- }
+ this->output_lists_[0].push_back(os);
+}
- // A small BSS section goes at the start of the BSS sections, after
- // other small BSS sections.
- if (os->type() == elfcpp::SHT_NOBITS && os->is_small_section())
- {
- for (Output_segment::Output_data_list::iterator p = pdl->begin();
- p != pdl->end();
- ++p)
- {
- if (!(*p)->is_section()
- || !(*p)->output_section()->is_small_section())
- {
- pdl->insert(p, os);
- return;
- }
- }
- }
+// Remove an Output_section from this segment. It is an error if it
+// is not present.
- // A large BSS section goes at the end of the BSS sections, which
- // means that one that is not large must come before the first large
- // one.
- if (os->type() == elfcpp::SHT_NOBITS
- && !os->is_large_section()
- && !pdl->empty()
- && pdl->back()->is_section()
- && pdl->back()->output_section()->is_large_section())
+void
+Output_segment::remove_output_section(Output_section* os)
+{
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
{
- for (Output_segment::Output_data_list::iterator p = pdl->begin();
- p != pdl->end();
- ++p)
+ Output_data_list* pdl = &this->output_lists_[i];
+ for (Output_data_list::iterator p = pdl->begin(); p != pdl->end(); ++p)
{
- if ((*p)->is_section()
- && (*p)->output_section()->is_large_section())
+ if (*p == os)
{
- pdl->insert(p, os);
+ pdl->erase(p);
return;
}
}
- gold_unreachable();
}
-
- // We do some further output section sorting in order to make the
- // generated program run more efficiently. We should only do this
- // when not using a linker script, so it is controled by the DO_SORT
- // parameter.
- if (do_sort)
- {
- // FreeBSD requires the .interp section to be in the first page
- // of the executable. That is a more efficient location anyhow
- // for any OS, since it means that the kernel will have the data
- // handy after it reads the program headers.
- if (os->is_interp() && !pdl->empty())
- {
- pdl->insert(pdl->begin(), os);
- return;
- }
-
- // Put loadable non-writable notes immediately after the .interp
- // sections, so that the PT_NOTE segment is on the first page of
- // the executable.
- if (os->type() == elfcpp::SHT_NOTE
- && (os->flags() & elfcpp::SHF_WRITE) == 0
- && !pdl->empty())
- {
- Output_segment::Output_data_list::iterator p = pdl->begin();
- if ((*p)->is_section() && (*p)->output_section()->is_interp())
- ++p;
- pdl->insert(p, os);
- return;
- }
-
- // If this section is used by the dynamic linker, and it is not
- // writable, then put it first, after the .interp section and
- // any loadable notes. This makes it more likely that the
- // dynamic linker will have to read less data from the disk.
- if (os->is_dynamic_linker_section()
- && !pdl->empty()
- && (os->flags() & elfcpp::SHF_WRITE) == 0)
- {
- bool is_reloc = (os->type() == elfcpp::SHT_REL
- || os->type() == elfcpp::SHT_RELA);
- Output_segment::Output_data_list::iterator p = pdl->begin();
- while (p != pdl->end()
- && (*p)->is_section()
- && ((*p)->output_section()->is_dynamic_linker_section()
- || (*p)->output_section()->type() == elfcpp::SHT_NOTE))
- {
- // Put reloc sections after the other ones. Putting the
- // dynamic reloc sections first confuses BFD, notably
- // objcopy and strip.
- if (!is_reloc
- && ((*p)->output_section()->type() == elfcpp::SHT_REL
- || (*p)->output_section()->type() == elfcpp::SHT_RELA))
- break;
- ++p;
- }
- pdl->insert(p, os);
- return;
- }
- }
-
- // If there were no constraints on the output section, just add it
- // to the end of the list.
- pdl->push_back(os);
-}
-
-// Remove an Output_section from this segment. It is an error if it
-// is not present.
-
-void
-Output_segment::remove_output_section(Output_section* os)
-{
- // We only need this for SHT_PROGBITS.
- gold_assert(os->type() == elfcpp::SHT_PROGBITS);
- for (Output_data_list::iterator p = this->output_data_.begin();
- p != this->output_data_.end();
- ++p)
- {
- if (*p == os)
- {
- this->output_data_.erase(p);
- return;
- }
- }
gold_unreachable();
}
Output_segment::add_initial_output_data(Output_data* od)
{
gold_assert(!this->is_max_align_known_);
- this->output_data_.push_front(od);
+ Output_data_list::iterator p = this->output_lists_[0].begin();
+ this->output_lists_[0].insert(p, od);
+}
+
+// Return true if this segment has any sections which hold actual
+// data, rather than being a BSS section.
+
+bool
+Output_segment::has_any_data_sections() const
+{
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ {
+ const Output_data_list* pdl = &this->output_lists_[i];
+ for (Output_data_list::const_iterator p = pdl->begin();
+ p != pdl->end();
+ ++p)
+ {
+ if (!(*p)->is_section())
+ return true;
+ if ((*p)->output_section()->type() != elfcpp::SHT_NOBITS)
+ return true;
+ }
+ }
+ return false;
}
-// Return whether the first data section is a relro section.
+// Return whether the first data section (not counting TLS sections)
+// is a relro section.
bool
Output_segment::is_first_section_relro() const
{
- return (!this->output_data_.empty()
- && this->output_data_.front()->is_section()
- && this->output_data_.front()->output_section()->is_relro());
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ {
+ if (i == static_cast<int>(ORDER_TLS_DATA)
+ || i == static_cast<int>(ORDER_TLS_BSS))
+ continue;
+ const Output_data_list* pdl = &this->output_lists_[i];
+ if (!pdl->empty())
+ {
+ Output_data* p = pdl->front();
+ return p->is_section() && p->output_section()->is_relro();
+ }
+ }
+ return false;
}
// Return the maximum alignment of the Output_data in Output_segment.
{
if (!this->is_max_align_known_)
{
- uint64_t addralign;
-
- addralign = Output_segment::maximum_alignment_list(&this->output_data_);
- if (addralign > this->max_align_)
- this->max_align_ = addralign;
-
- addralign = Output_segment::maximum_alignment_list(&this->output_bss_);
- if (addralign > this->max_align_)
- this->max_align_ = addralign;
-
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ {
+ const Output_data_list* pdl = &this->output_lists_[i];
+ uint64_t addralign = Output_segment::maximum_alignment_list(pdl);
+ if (addralign > this->max_align_)
+ this->max_align_ = addralign;
+ }
this->is_max_align_known_ = true;
}
return ret;
}
-// Return the number of dynamic relocs applied to this segment.
+// Return whether this segment has any dynamic relocs.
-unsigned int
-Output_segment::dynamic_reloc_count() const
+bool
+Output_segment::has_dynamic_reloc() const
{
- return (this->dynamic_reloc_count_list(&this->output_data_)
- + this->dynamic_reloc_count_list(&this->output_bss_));
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ if (this->has_dynamic_reloc_list(&this->output_lists_[i]))
+ return true;
+ return false;
}
-// Return the number of dynamic relocs applied to an Output_data_list.
+// Return whether this Output_data_list has any dynamic relocs.
-unsigned int
-Output_segment::dynamic_reloc_count_list(const Output_data_list* pdl) const
+bool
+Output_segment::has_dynamic_reloc_list(const Output_data_list* pdl) const
{
- unsigned int count = 0;
for (Output_data_list::const_iterator p = pdl->begin();
p != pdl->end();
++p)
- count += (*p)->dynamic_reloc_count();
- return count;
+ if ((*p)->has_dynamic_reloc())
+ return true;
+ return false;
}
// Set the section addresses for an Output_segment. If RESET is true,
// reset the addresses first. ADDR is the address and *POFF is the
// file offset. Set the section indexes starting with *PSHNDX.
-// Return the address of the immediately following segment. Update
-// *POFF and *PSHNDX.
+// INCREASE_RELRO is the size of the portion of the first non-relro
+// section that should be included in the PT_GNU_RELRO segment.
+// If this segment has relro sections, and has been aligned for
+// that purpose, set *HAS_RELRO to TRUE. Return the address of
+// the immediately following segment. Update *HAS_RELRO, *POFF,
+// and *PSHNDX.
uint64_t
Output_segment::set_section_addresses(const Layout* layout, bool reset,
uint64_t addr,
- unsigned int increase_relro,
+ unsigned int* increase_relro,
+ bool* has_relro,
off_t* poff,
unsigned int* pshndx)
{
gold_assert(this->type_ == elfcpp::PT_LOAD);
+ uint64_t last_relro_pad = 0;
off_t orig_off = *poff;
+ bool in_tls = false;
+
// If we have relro sections, we need to pad forward now so that the
// relro sections plus INCREASE_RELRO end on a common page boundary.
if (parameters->options().relro()
{
uint64_t relro_size = 0;
off_t off = *poff;
- for (Output_data_list::iterator p = this->output_data_.begin();
- p != this->output_data_.end();
- ++p)
+ uint64_t max_align = 0;
+ for (int i = 0; i <= static_cast<int>(ORDER_RELRO_LAST); ++i)
{
- if (!(*p)->is_section())
- break;
- Output_section* pos = (*p)->output_section();
- if (!pos->is_relro())
- break;
- gold_assert(!(*p)->is_section_flag_set(elfcpp::SHF_TLS));
- if ((*p)->is_address_valid())
- relro_size += (*p)->data_size();
- else
+ Output_data_list* pdl = &this->output_lists_[i];
+ Output_data_list::iterator p;
+ for (p = pdl->begin(); p != pdl->end(); ++p)
{
- // FIXME: This could be faster.
- (*p)->set_address_and_file_offset(addr + relro_size,
- off + relro_size);
- relro_size += (*p)->data_size();
- (*p)->reset_address_and_file_offset();
+ if (!(*p)->is_section())
+ break;
+ uint64_t align = (*p)->addralign();
+ if (align > max_align)
+ max_align = align;
+ if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
+ in_tls = true;
+ else if (in_tls)
+ {
+ // Align the first non-TLS section to the alignment
+ // of the TLS segment.
+ align = max_align;
+ in_tls = false;
+ }
+ relro_size = align_address(relro_size, align);
+ // Ignore the size of the .tbss section.
+ if ((*p)->is_section_flag_set(elfcpp::SHF_TLS)
+ && (*p)->is_section_type(elfcpp::SHT_NOBITS))
+ continue;
+ if ((*p)->is_address_valid())
+ relro_size += (*p)->data_size();
+ else
+ {
+ // FIXME: This could be faster.
+ (*p)->set_address_and_file_offset(addr + relro_size,
+ off + relro_size);
+ relro_size += (*p)->data_size();
+ (*p)->reset_address_and_file_offset();
+ }
}
+ if (p != pdl->end())
+ break;
}
- relro_size += increase_relro;
+ relro_size += *increase_relro;
+ // Pad the total relro size to a multiple of the maximum
+ // section alignment seen.
+ uint64_t aligned_size = align_address(relro_size, max_align);
+ // Note the amount of padding added after the last relro section.
+ last_relro_pad = aligned_size - relro_size;
+ *has_relro = true;
uint64_t page_align = parameters->target().common_pagesize();
// Align to offset N such that (N + RELRO_SIZE) % PAGE_ALIGN == 0.
- uint64_t desired_align = page_align - (relro_size % page_align);
+ uint64_t desired_align = page_align - (aligned_size % page_align);
if (desired_align < *poff % page_align)
*poff += page_align - *poff % page_align;
*poff += desired_align - *poff % page_align;
this->are_addresses_set_ = true;
}
- bool in_tls = false;
+ in_tls = false;
this->offset_ = orig_off;
- addr = this->set_section_list_addresses(layout, reset, &this->output_data_,
- addr, poff, pshndx, &in_tls);
- this->filesz_ = *poff - orig_off;
-
- off_t off = *poff;
+ off_t off = 0;
+ uint64_t ret;
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ {
+ if (i == static_cast<int>(ORDER_RELRO_LAST))
+ {
+ *poff += last_relro_pad;
+ addr += last_relro_pad;
+ if (this->output_lists_[i].empty())
+ {
+ // If there is nothing in the ORDER_RELRO_LAST list,
+ // the padding will occur at the end of the relro
+ // segment, and we need to add it to *INCREASE_RELRO.
+ *increase_relro += last_relro_pad;
+ }
+ }
+ addr = this->set_section_list_addresses(layout, reset,
+ &this->output_lists_[i],
+ addr, poff, pshndx, &in_tls);
+ if (i < static_cast<int>(ORDER_SMALL_BSS))
+ {
+ this->filesz_ = *poff - orig_off;
+ off = *poff;
+ }
- uint64_t ret = this->set_section_list_addresses(layout, reset,
- &this->output_bss_,
- addr, poff, pshndx,
- &in_tls);
+ ret = addr;
+ }
// If the last section was a TLS section, align upward to the
// alignment of the TLS segment, so that the overall size of the TLS
gold_assert(!this->are_addresses_set_);
- if (this->output_data_.empty() && this->output_bss_.empty())
+ // A non-load section only uses output_lists_[0].
+
+ Output_data_list* pdl = &this->output_lists_[0];
+
+ if (pdl->empty())
{
gold_assert(increase == 0);
this->vaddr_ = 0;
return;
}
- const Output_data* first;
- if (this->output_data_.empty())
- first = this->output_bss_.front();
- else
- first = this->output_data_.front();
+ // Find the first and last section by address.
+ const Output_data* first = NULL;
+ const Output_data* last_data = NULL;
+ const Output_data* last_bss = NULL;
+ for (Output_data_list::const_iterator p = pdl->begin();
+ p != pdl->end();
+ ++p)
+ {
+ if (first == NULL
+ || (*p)->address() < first->address()
+ || ((*p)->address() == first->address()
+ && (*p)->data_size() < first->data_size()))
+ first = *p;
+ const Output_data** plast;
+ if ((*p)->is_section()
+ && (*p)->output_section()->type() == elfcpp::SHT_NOBITS)
+ plast = &last_bss;
+ else
+ plast = &last_data;
+ if (*plast == NULL
+ || (*p)->address() > (*plast)->address()
+ || ((*p)->address() == (*plast)->address()
+ && (*p)->data_size() > (*plast)->data_size()))
+ *plast = *p;
+ }
+
this->vaddr_ = first->address();
this->paddr_ = (first->has_load_address()
? first->load_address()
this->are_addresses_set_ = true;
this->offset_ = first->offset();
- if (this->output_data_.empty())
+ if (last_data == NULL)
this->filesz_ = 0;
else
- {
- const Output_data* last_data = this->output_data_.back();
- this->filesz_ = (last_data->address()
- + last_data->data_size()
- - this->vaddr_);
- }
+ this->filesz_ = (last_data->address()
+ + last_data->data_size()
+ - this->vaddr_);
- const Output_data* last;
- if (this->output_bss_.empty())
- last = this->output_data_.back();
- else
- last = this->output_bss_.back();
+ const Output_data* last = last_bss != NULL ? last_bss : last_data;
this->memsz_ = (last->address()
+ last->data_size()
- this->vaddr_);
this->filesz_ += increase;
this->memsz_ += increase;
+ // If this is a RELRO segment, verify that the segment ends at a
+ // page boundary.
+ if (this->type_ == elfcpp::PT_GNU_RELRO)
+ {
+ uint64_t page_align = parameters->target().common_pagesize();
+ uint64_t segment_end = this->vaddr_ + this->memsz_;
+ gold_assert(segment_end == align_address(segment_end, page_align));
+ }
+
// If this is a TLS segment, align the memory size. The code in
// set_section_list ensures that the section after the TLS segment
// is aligned to give us room.
{
gold_assert(this->type_ == elfcpp::PT_TLS);
- for (Output_data_list::iterator p = this->output_data_.begin();
- p != this->output_data_.end();
- ++p)
- (*p)->set_tls_offset(this->vaddr_);
-
- for (Output_data_list::iterator p = this->output_bss_.begin();
- p != this->output_bss_.end();
+ for (Output_data_list::iterator p = this->output_lists_[0].begin();
+ p != this->output_lists_[0].end();
++p)
(*p)->set_tls_offset(this->vaddr_);
}
-// Return the address of the first section.
+// Return the load address of the first section.
uint64_t
Output_segment::first_section_load_address() const
{
- for (Output_data_list::const_iterator p = this->output_data_.begin();
- p != this->output_data_.end();
- ++p)
- if ((*p)->is_section())
- return (*p)->has_load_address() ? (*p)->load_address() : (*p)->address();
-
- for (Output_data_list::const_iterator p = this->output_bss_.begin();
- p != this->output_bss_.end();
- ++p)
- if ((*p)->is_section())
- return (*p)->has_load_address() ? (*p)->load_address() : (*p)->address();
-
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ {
+ const Output_data_list* pdl = &this->output_lists_[i];
+ for (Output_data_list::const_iterator p = pdl->begin();
+ p != pdl->end();
+ ++p)
+ {
+ if ((*p)->is_section())
+ return ((*p)->has_load_address()
+ ? (*p)->load_address()
+ : (*p)->address());
+ }
+ }
gold_unreachable();
}
unsigned int
Output_segment::output_section_count() const
{
- return (this->output_section_count_list(&this->output_data_)
- + this->output_section_count_list(&this->output_bss_));
+ unsigned int ret = 0;
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ ret += this->output_section_count_list(&this->output_lists_[i]);
+ return ret;
}
// Return the number of Output_sections in an Output_data_list.
{
Output_section* found = NULL;
uint64_t found_lma = 0;
- this->lowest_load_address_in_list(&this->output_data_, &found, &found_lma);
-
- Output_section* found_data = found;
- this->lowest_load_address_in_list(&this->output_bss_, &found, &found_lma);
- if (found != found_data && found_data != NULL)
- {
- gold_error(_("nobits section %s may not precede progbits section %s "
- "in same segment"),
- found->name(), found_data->name());
- return NULL;
- }
-
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ this->lowest_load_address_in_list(&this->output_lists_[i], &found,
+ &found_lma);
return found;
}
Output_segment::write_section_headers(const Layout* layout,
const Stringpool* secnamepool,
unsigned char* v,
- unsigned int *pshndx) const
+ unsigned int* pshndx) const
{
// Every section that is attached to a segment must be attached to a
// PT_LOAD segment, so we only write out section headers for PT_LOAD
if (this->type_ != elfcpp::PT_LOAD)
return v;
- v = this->write_section_headers_list<size, big_endian>(layout, secnamepool,
- &this->output_data_,
- v, pshndx);
- v = this->write_section_headers_list<size, big_endian>(layout, secnamepool,
- &this->output_bss_,
- v, pshndx);
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ {
+ const Output_data_list* pdl = &this->output_lists_[i];
+ v = this->write_section_headers_list<size, big_endian>(layout,
+ secnamepool,
+ pdl,
+ v, pshndx);
+ }
+
return v;
}
{
if (this->type() != elfcpp::PT_LOAD)
return;
- this->print_section_list_to_mapfile(mapfile, &this->output_data_);
- this->print_section_list_to_mapfile(mapfile, &this->output_bss_);
+ for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
+ this->print_section_list_to_mapfile(mapfile, &this->output_lists_[i]);
}
// Print an output section list to the map file.
template
off_t
Output_section::add_input_section<32, false>(
+ Layout* layout,
Sized_relobj<32, false>* object,
unsigned int shndx,
const char* secname,
template
off_t
Output_section::add_input_section<32, true>(
+ Layout* layout,
Sized_relobj<32, true>* object,
unsigned int shndx,
const char* secname,
template
off_t
Output_section::add_input_section<64, false>(
+ Layout* layout,
Sized_relobj<64, false>* object,
unsigned int shndx,
const char* secname,
template
off_t
Output_section::add_input_section<64, true>(
+ Layout* layout,
Sized_relobj<64, true>* object,
unsigned int shndx,
const char* secname,
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