#include "symtab.h"
#include "reloc.h"
#include "merge.h"
+#include "descriptors.h"
#include "output.h"
// Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS
const Layout::Segment_list* segment_list,
const Layout::Section_list* section_list,
const Layout::Section_list* unattached_section_list,
- const Stringpool* secnamepool)
+ const Stringpool* secnamepool,
+ const Output_section* shstrtab_section)
: layout_(layout),
segment_list_(segment_list),
section_list_(section_list),
unattached_section_list_(unattached_section_list),
- secnamepool_(secnamepool)
+ secnamepool_(secnamepool),
+ shstrtab_section_(shstrtab_section)
{
// Count all the sections. Start with 1 for the null section.
off_t count = 1;
oshdr.put_sh_flags(0);
oshdr.put_sh_addr(0);
oshdr.put_sh_offset(0);
- oshdr.put_sh_size(0);
- oshdr.put_sh_link(0);
+
+ size_t section_count = (this->data_size()
+ / elfcpp::Elf_sizes<size>::shdr_size);
+ if (section_count < elfcpp::SHN_LORESERVE)
+ oshdr.put_sh_size(0);
+ else
+ oshdr.put_sh_size(section_count);
+
+ unsigned int shstrndx = this->shstrtab_section_->out_shndx();
+ if (shstrndx < elfcpp::SHN_LORESERVE)
+ oshdr.put_sh_link(0);
+ else
+ oshdr.put_sh_link(shstrndx);
+
oshdr.put_sh_info(0);
oshdr.put_sh_addralign(0);
oshdr.put_sh_entsize(0);
}
oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
- oehdr.put_e_shnum(this->section_header_->data_size()
- / elfcpp::Elf_sizes<size>::shdr_size);
- oehdr.put_e_shstrndx(this->shstrtab_->out_shndx());
+ size_t section_count = (this->section_header_->data_size()
+ / elfcpp::Elf_sizes<size>::shdr_size);
+
+ if (section_count < elfcpp::SHN_LORESERVE)
+ oehdr.put_e_shnum(this->section_header_->data_size()
+ / elfcpp::Elf_sizes<size>::shdr_size);
+ else
+ oehdr.put_e_shnum(0);
+
+ unsigned int shstrndx = this->shstrtab_->out_shndx();
+ if (shstrndx < elfcpp::SHN_LORESERVE)
+ oehdr.put_e_shstrndx(this->shstrtab_->out_shndx());
+ else
+ oehdr.put_e_shstrndx(elfcpp::SHN_XINDEX);
of->write_output_view(0, ehdr_size, view);
}
return this->output_section_->out_shndx();
}
+// Set the alignment, which means we may need to update the alignment
+// of the output section.
+
+void
+Output_section_data::set_addralign(uint64_t addralign)
+{
+ this->addralign_ = addralign;
+ if (this->output_section_ != NULL
+ && this->output_section_->addralign() < addralign)
+ this->output_section_->set_addralign(addralign);
+}
+
// Output_data_strtab methods.
// Set the final data size.
Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
Symbol* gsym,
unsigned int type,
- Relobj* relobj,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx,
Address address,
bool is_relative)
Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
Output_section* os,
unsigned int type,
- Relobj* relobj,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx,
Address address)
: address_(address), local_sym_index_(SECTION_CODE), type_(type),
if (!this->is_section_symbol_)
this->u1_.relobj->set_needs_output_dynsym_entry(lsi);
else
- {
- section_offset_type dummy;
- Output_section* os = this->u1_.relobj->output_section(lsi, &dummy);
- gold_assert(os != NULL);
- os->set_needs_dynsym_index();
- }
+ this->u1_.relobj->output_section(lsi)->set_needs_dynsym_index();
}
break;
}
}
else
{
- section_offset_type dummy;
- Output_section* os = this->u1_.relobj->output_section(lsi, &dummy);
+ Output_section* os = this->u1_.relobj->output_section(lsi);
gold_assert(os != NULL);
if (dynamic)
index = os->dynsym_index();
// within the input section.
template<bool dynamic, int size, bool big_endian>
-section_offset_type
+typename elfcpp::Elf_types<size>::Elf_Addr
Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::
local_section_offset(Addend addend) const
{
&& this->local_sym_index_ != INVALID_CODE
&& this->is_section_symbol_);
const unsigned int lsi = this->local_sym_index_;
- section_offset_type offset;
- Output_section* os = this->u1_.relobj->output_section(lsi, &offset);
+ Output_section* os = this->u1_.relobj->output_section(lsi);
gold_assert(os != NULL);
- if (offset != -1)
+ Address offset = this->u1_.relobj->get_output_section_offset(lsi);
+ if (offset != -1U)
return offset + addend;
// This is a merge section.
offset = os->output_address(this->u1_.relobj, lsi, addend);
- gold_assert(offset != -1);
+ gold_assert(offset != -1U);
return offset;
}
-// Write out the offset and info fields of a Rel or Rela relocation
-// entry.
+// Get the output address of a relocation.
template<bool dynamic, int size, bool big_endian>
-template<typename Write_rel>
-void
-Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel(
- Write_rel* wr) const
+typename elfcpp::Elf_types<size>::Elf_Addr
+Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_address() const
{
Address address = this->address_;
if (this->shndx_ != INVALID_CODE)
{
- section_offset_type off;
- Output_section* os = this->u2_.relobj->output_section(this->shndx_,
- &off);
+ Output_section* os = this->u2_.relobj->output_section(this->shndx_);
gold_assert(os != NULL);
- if (off != -1)
+ Address off = this->u2_.relobj->get_output_section_offset(this->shndx_);
+ if (off != -1U)
address += os->address() + off;
else
{
}
else if (this->u2_.od != NULL)
address += this->u2_.od->address();
- wr->put_r_offset(address);
+ return address;
+}
+
+// Write out the offset and info fields of a Rel or Rela relocation
+// entry.
+
+template<bool dynamic, int size, bool big_endian>
+template<typename Write_rel>
+void
+Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel(
+ Write_rel* wr) const
+{
+ wr->put_r_offset(this->get_address());
unsigned int sym_index = this->is_relative_ ? 0 : this->get_symbol_index();
wr->put_r_info(elfcpp::elf_r_info<size>(sym_index, this->type_));
}
return symval->value(this->u1_.relobj, addend);
}
+// Reloc comparison. This function sorts the dynamic relocs for the
+// benefit of the dynamic linker. First we sort all relative relocs
+// to the front. Among relative relocs, we sort by output address.
+// Among non-relative relocs, we sort by symbol index, then by output
+// address.
+
+template<bool dynamic, int size, bool big_endian>
+int
+Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::
+ compare(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& r2)
+ const
+{
+ if (this->is_relative_)
+ {
+ if (!r2.is_relative_)
+ return -1;
+ // Otherwise sort by reloc address below.
+ }
+ else if (r2.is_relative_)
+ return 1;
+ else
+ {
+ unsigned int sym1 = this->get_symbol_index();
+ unsigned int sym2 = r2.get_symbol_index();
+ if (sym1 < sym2)
+ return -1;
+ else if (sym1 > sym2)
+ return 1;
+ // Otherwise sort by reloc address.
+ }
+
+ section_offset_type addr1 = this->get_address();
+ section_offset_type addr2 = r2.get_address();
+ if (addr1 < addr2)
+ return -1;
+ else if (addr1 > addr2)
+ return 1;
+
+ // Final tie breaker, in order to generate the same output on any
+ // host: reloc type.
+ unsigned int type1 = this->type_;
+ unsigned int type2 = r2.type_;
+ if (type1 < type2)
+ return -1;
+ else if (type1 > type2)
+ return 1;
+
+ // These relocs appear to be exactly the same.
+ return 0;
+}
+
// Write out a Rela relocation.
template<bool dynamic, int size, bool big_endian>
const off_t oview_size = this->data_size();
unsigned char* const oview = of->get_output_view(off, oview_size);
+ if (this->sort_relocs_)
+ {
+ gold_assert(dynamic);
+ std::sort(this->relocs_.begin(), this->relocs_.end(),
+ Sort_relocs_comparison());
+ }
+
unsigned char* pov = oview;
for (typename Relocs::const_iterator p = this->relocs_.begin();
p != this->relocs_.end();
Output_data_group<size, big_endian>::Output_data_group(
Sized_relobj<size, big_endian>* relobj,
section_size_type entry_count,
- const elfcpp::Elf_Word* contents)
+ elfcpp::Elf_Word flags,
+ std::vector<unsigned int>* input_shndxes)
: Output_section_data(entry_count * 4, 4),
- relobj_(relobj)
+ relobj_(relobj),
+ flags_(flags)
{
- this->flags_ = elfcpp::Swap<32, big_endian>::readval(contents);
- for (section_size_type i = 1; i < entry_count; ++i)
- {
- unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i);
- this->input_sections_.push_back(shndx);
- }
+ this->input_shndxes_.swap(*input_shndxes);
}
// Write out the section group, which means translating the section
++contents;
for (std::vector<unsigned int>::const_iterator p =
- this->input_sections_.begin();
- p != this->input_sections_.end();
+ this->input_shndxes_.begin();
+ p != this->input_shndxes_.end();
++p, ++contents)
{
- section_offset_type dummy;
- Output_section* os = this->relobj_->output_section(*p, &dummy);
+ Output_section* os = this->relobj_->output_section(*p);
unsigned int output_shndx;
if (os != NULL)
of->write_output_view(off, oview_size, oview);
// We no longer need this information.
- this->input_sections_.clear();
+ this->input_shndxes_.clear();
}
// Output_data_got::Got_entry methods.
this->entries_.push_back(Got_entry());
unsigned int got_offset = this->last_got_offset();
object->set_local_got_offset(symndx, got_type, got_offset);
- section_offset_type off;
- Output_section* os = object->output_section(shndx, &off);
+ 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());
unsigned int got_offset = this->last_got_offset();
object->set_local_got_offset(symndx, got_type, got_offset);
- section_offset_type off;
- Output_section* os = object->output_section(shndx, &off);
+ 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));
const Stringpool* pool) const
{
typename elfcpp::Elf_types<size>::Elf_WXword val;
- switch (this->classification_)
+ switch (this->offset_)
{
case DYNAMIC_NUMBER:
val = this->u_.val;
break;
- case DYNAMIC_SECTION_ADDRESS:
- val = this->u_.od->address();
- break;
-
case DYNAMIC_SECTION_SIZE:
val = this->u_.od->data_size();
break;
break;
default:
- gold_unreachable();
+ val = this->u_.od->address() + this->offset_;
+ break;
}
elfcpp::Dyn_write<size, big_endian> dw(pov);
this->entries_.clear();
}
+// Class Output_symtab_xindex.
+
+void
+Output_symtab_xindex::do_write(Output_file* of)
+{
+ const off_t offset = this->offset();
+ const off_t oview_size = this->data_size();
+ unsigned char* const oview = of->get_output_view(offset, oview_size);
+
+ memset(oview, 0, oview_size);
+
+ if (parameters->target().is_big_endian())
+ this->endian_do_write<true>(oview);
+ else
+ this->endian_do_write<false>(oview);
+
+ of->write_output_view(offset, oview_size, oview);
+
+ // We no longer need the data.
+ this->entries_.clear();
+}
+
+template<bool big_endian>
+void
+Output_symtab_xindex::endian_do_write(unsigned char* const oview)
+{
+ for (Xindex_entries::const_iterator p = this->entries_.begin();
+ p != this->entries_.end();
+ ++p)
+ elfcpp::Swap<32, big_endian>::writeval(oview + p->first * 4, p->second);
+}
+
// Output_section::Input_section methods.
// Return the data size. For an input section we store the size here.
this->u2_.posd->write_to_buffer(buffer);
}
+// Print to a map file.
+
+void
+Output_section::Input_section::print_to_mapfile(Mapfile* mapfile) const
+{
+ switch (this->shndx_)
+ {
+ case OUTPUT_SECTION_CODE:
+ case MERGE_DATA_SECTION_CODE:
+ case MERGE_STRING_SECTION_CODE:
+ this->u2_.posd->print_to_mapfile(mapfile);
+ break;
+
+ default:
+ mapfile->print_input_section(this->u2_.object, this->shndx_);
+ break;
+ }
+}
+
// Output_section methods.
// Construct an Output_section. NAME will point into a Stringpool.
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),
tls_offset_(0)
{
// An unallocated section has no address. Forcing this means that
this->addralign_ = addralign;
typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags();
- this->flags_ |= (sh_flags
- & (elfcpp::SHF_WRITE
- | elfcpp::SHF_ALLOC
- | elfcpp::SHF_EXECINSTR));
+ this->update_flags_for_input_section(sh_flags);
uint64_t entsize = shdr.get_sh_entsize();
// If this is a SHF_MERGE section, we pass all the input sections to
// a Output_data_merge. We don't try to handle relocations for such
- // a section.
+ // a section. We don't try to handle empty merge sections--they
+ // mess up the mappings, and are useless anyhow.
if ((sh_flags & elfcpp::SHF_MERGE) != 0
- && reloc_shndx == 0)
+ && reloc_shndx == 0
+ && shdr.get_sh_size() > 0)
{
if (this->add_merge_input_section(object, shndx, sh_flags,
entsize, addralign))
if (have_sections_script
|| !this->input_sections_.empty()
|| this->may_sort_attached_input_sections()
- || this->must_sort_attached_input_sections())
+ || this->must_sort_attached_input_sections()
+ || parameters->options().user_set_Map())
this->input_sections_.push_back(Input_section(object, shndx,
shdr.get_sh_size(),
addralign));
unsigned int shndx,
off_t offset) const
{
- gold_assert(object->is_section_specially_mapped(shndx));
-
for (Input_section_list::const_iterator p = this->input_sections_.begin();
p != this->input_sections_.end();
++p)
Output_section::output_offset(const Relobj* object, unsigned int shndx,
section_offset_type offset) const
{
- gold_assert(object->is_section_specially_mapped(shndx));
// This can only be called meaningfully when layout is complete.
gold_assert(Output_data::is_layout_complete());
Output_section::output_address(const Relobj* object, unsigned int shndx,
off_t offset) const
{
- gold_assert(object->is_section_specially_mapped(shndx));
-
uint64_t addr = this->address() + this->first_input_offset_;
for (Input_section_list::const_iterator p = this->input_sections_.begin();
p != this->input_sections_.end();
Output_section::starting_output_address(const Relobj* object,
unsigned int shndx) const
{
- gold_assert(object->is_section_specially_mapped(shndx));
-
uint64_t addr = this->address() + this->first_input_offset_;
for (Input_section_list::const_iterator p = this->input_sections_.begin();
p != this->input_sections_.end();
data_size, addralign));
}
+// Print to the map file.
+
+void
+Output_section::do_print_to_mapfile(Mapfile* mapfile) const
+{
+ mapfile->print_output_section(this);
+
+ for (Input_section_list::const_iterator p = this->input_sections_.begin();
+ p != this->input_sections_.end();
+ ++p)
+ p->print_to_mapfile(mapfile);
+}
+
// Print stats for merge sections to stderr.
void
void
Output_segment::add_output_section(Output_section* os,
- elfcpp::Elf_Word seg_flags,
- bool front)
+ elfcpp::Elf_Word seg_flags)
{
gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
gold_assert(!this->is_max_align_known_);
--p;
if ((*p)->is_section_type(elfcpp::SHT_NOTE))
{
- // We don't worry about the FRONT parameter.
++p;
pdl->insert(p, os);
return;
{
sawtls = true;
// Put a NOBITS section after the first TLS section.
- // But a PROGBITS section after the first TLS/PROGBITS
+ // Put a PROGBITS section after the first TLS/PROGBITS
// section.
insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS);
}
if (insert)
{
- // We don't worry about the FRONT parameter.
++p;
pdl->insert(p, os);
return;
// location in the section list.
}
- if (front)
- pdl->push_front(os);
- else
- pdl->push_back(os);
+ // For the PT_GNU_RELRO segment, we need to group relro sections,
+ // and we need to put them before any non-relro sections. Also,
+ // relro local sections go before relro non-local sections.
+ if (parameters->options().relro() && 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;
+
+ Output_section* pos = (*p)->output_section();
+ if (!pos->is_relro()
+ || (os->is_relro_local() && !pos->is_relro_local()))
+ break;
+ }
+
+ pdl->insert(p, os);
+ return;
+ }
+
+ pdl->push_back(os);
}
// Remove an Output_section from this segment. It is an error if it
this->output_data_.push_front(od);
}
+// Return whether the first data section 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());
+}
+
// Return the maximum alignment of the Output_data in Output_segment.
uint64_t
if (addralign > this->max_align_)
this->max_align_ = addralign;
+ // If -z relro is in effect, and the first section in this
+ // segment is a relro section, then the segment must be aligned
+ // to at least the common page size. This ensures that the
+ // PT_GNU_RELRO segment will start at a page boundary.
+ if (parameters->options().relro() && this->is_first_section_relro())
+ {
+ addralign = parameters->target().common_pagesize();
+ if (addralign > this->max_align_)
+ this->max_align_ = addralign;
+ }
+
this->is_max_align_known_ = true;
}
bool in_tls = false;
+ bool in_relro = (parameters->options().relro()
+ && this->is_first_section_relro());
+
off_t orig_off = *poff;
this->offset_ = orig_off;
addr = this->set_section_list_addresses(layout, reset, &this->output_data_,
- addr, poff, pshndx, &in_tls);
+ addr, poff, pshndx, &in_tls,
+ &in_relro);
this->filesz_ = *poff - orig_off;
off_t off = *poff;
uint64_t ret = this->set_section_list_addresses(layout, reset,
&this->output_bss_,
addr, poff, pshndx,
- &in_tls);
+ &in_tls, &in_relro);
// 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
*poff = align_address(*poff, segment_align);
}
+ // If all the sections were relro sections, align upward to the
+ // common page size.
+ if (in_relro)
+ {
+ uint64_t page_align = parameters->target().common_pagesize();
+ *poff = align_address(*poff, page_align);
+ }
+
this->memsz_ = *poff - orig_off;
// Ignore the file offset adjustments made by the BSS Output_data
Output_data_list* pdl,
uint64_t addr, off_t* poff,
unsigned int* pshndx,
- bool* in_tls)
+ bool* in_tls, bool* in_relro)
{
off_t startoff = *poff;
}
}
+ // If this is a non-relro section after a relro section,
+ // align it to a common page boundary so that the dynamic
+ // linker has a page to mark as read-only.
+ if (*in_relro
+ && (!(*p)->is_section()
+ || !(*p)->output_section()->is_relro()))
+ {
+ uint64_t page_align = parameters->target().common_pagesize();
+ if (page_align > align)
+ align = page_align;
+ *in_relro = false;
+ }
+
off = align_address(off, align);
(*p)->set_address_and_file_offset(addr + (off - startoff), off);
}
gold_assert(this->vaddr_ == align_address(this->vaddr_, segment_align));
this->memsz_ = align_address(this->memsz_, segment_align);
}
+
+ // If this is a RELRO segment, align the memory size. The code in
+ // set_section_list ensures that the section after the RELRO segment
+ // is aligned to give us room.
+ if (this->type_ == elfcpp::PT_GNU_RELRO)
+ {
+ uint64_t page_align = parameters->target().common_pagesize();
+ gold_assert(this->vaddr_ == align_address(this->vaddr_, page_align));
+ this->memsz_ = align_address(this->memsz_, page_align);
+ }
}
// Set the TLS offsets of the sections in the PT_TLS segment.
return v;
}
+// Print the output sections to the map file.
+
+void
+Output_segment::print_sections_to_mapfile(Mapfile* mapfile) const
+{
+ 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_);
+}
+
+// Print an output section list to the map file.
+
+void
+Output_segment::print_section_list_to_mapfile(Mapfile* mapfile,
+ const Output_data_list* pdl) const
+{
+ for (Output_data_list::const_iterator p = pdl->begin();
+ p != pdl->end();
+ ++p)
+ (*p)->print_to_mapfile(mapfile);
+}
+
// Output_file methods.
Output_file::Output_file(const char* name)
unlink_if_ordinary(this->name_);
int mode = parameters->options().relocatable() ? 0666 : 0777;
- int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode);
+ int o = open_descriptor(-1, this->name_, O_RDWR | O_CREAT | O_TRUNC,
+ mode);
if (o < 0)
gold_fatal(_("%s: open: %s"), this->name_, strerror(errno));
this->o_ = o;
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