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- // output.cc -- manage the output file for gold
- // Copyright (C) 2006-2022 Free Software Foundation, Inc.
- // Written by Ian Lance Taylor <iant@google.com>.
- // This file is part of gold.
- // This program is free software; you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation; either version 3 of the License, or
- // (at your option) any later version.
- // This program is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // You should have received a copy of the GNU General Public License
- // along with this program; if not, write to the Free Software
- // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- // MA 02110-1301, USA.
- #include "gold.h"
- #include <cstdlib>
- #include <cstring>
- #include <cerrno>
- #include <fcntl.h>
- #include <unistd.h>
- #include <sys/stat.h>
- #include <algorithm>
- #ifdef HAVE_SYS_MMAN_H
- #include <sys/mman.h>
- #endif
- #include "libiberty.h"
- #include "dwarf.h"
- #include "parameters.h"
- #include "object.h"
- #include "symtab.h"
- #include "reloc.h"
- #include "merge.h"
- #include "descriptors.h"
- #include "layout.h"
- #include "output.h"
- // For systems without mmap support.
- #ifndef HAVE_MMAP
- # define mmap gold_mmap
- # define munmap gold_munmap
- # define mremap gold_mremap
- # ifndef MAP_FAILED
- # define MAP_FAILED (reinterpret_cast<void*>(-1))
- # endif
- # ifndef PROT_READ
- # define PROT_READ 0
- # endif
- # ifndef PROT_WRITE
- # define PROT_WRITE 0
- # endif
- # ifndef MAP_PRIVATE
- # define MAP_PRIVATE 0
- # endif
- # ifndef MAP_ANONYMOUS
- # define MAP_ANONYMOUS 0
- # endif
- # ifndef MAP_SHARED
- # define MAP_SHARED 0
- # endif
- # ifndef ENOSYS
- # define ENOSYS EINVAL
- # endif
- static void *
- gold_mmap(void *, size_t, int, int, int, off_t)
- {
- errno = ENOSYS;
- return MAP_FAILED;
- }
- static int
- gold_munmap(void *, size_t)
- {
- errno = ENOSYS;
- return -1;
- }
- static void *
- gold_mremap(void *, size_t, size_t, int)
- {
- errno = ENOSYS;
- return MAP_FAILED;
- }
- #endif
- #if defined(HAVE_MMAP) && !defined(HAVE_MREMAP)
- # define mremap gold_mremap
- extern "C" void *gold_mremap(void *, size_t, size_t, int);
- #endif
- // Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS
- #ifndef MAP_ANONYMOUS
- # define MAP_ANONYMOUS MAP_ANON
- #endif
- #ifndef MREMAP_MAYMOVE
- # define MREMAP_MAYMOVE 1
- #endif
- // Mingw does not have S_ISLNK.
- #ifndef S_ISLNK
- # define S_ISLNK(mode) 0
- #endif
- namespace gold
- {
- // A wrapper around posix_fallocate. If we don't have posix_fallocate,
- // or the --no-posix-fallocate option is set, we try the fallocate
- // system call directly. If that fails, we use ftruncate to set
- // the file size and hope that there is enough disk space.
- static int
- gold_fallocate(int o, off_t offset, off_t len)
- {
- if (len <= 0)
- return 0;
- #ifdef HAVE_POSIX_FALLOCATE
- if (parameters->options().posix_fallocate())
- {
- int err = ::posix_fallocate(o, offset, len);
- if (err != EINVAL && err != ENOSYS && err != EOPNOTSUPP)
- return err;
- }
- #endif // defined(HAVE_POSIX_FALLOCATE)
- #ifdef HAVE_FALLOCATE
- {
- errno = 0;
- int err = ::fallocate(o, 0, offset, len);
- if (err < 0 && errno != EINVAL && errno != ENOSYS && errno != EOPNOTSUPP)
- return errno;
- }
- #endif // defined(HAVE_FALLOCATE)
- errno = 0;
- if (::ftruncate(o, offset + len) < 0)
- return errno;
- return 0;
- }
- // Output_data variables.
- bool Output_data::allocated_sizes_are_fixed;
- // Output_data methods.
- Output_data::~Output_data()
- {
- }
- // Return the default alignment for the target size.
- uint64_t
- Output_data::default_alignment()
- {
- return Output_data::default_alignment_for_size(
- parameters->target().get_size());
- }
- // Return the default alignment for a size--32 or 64.
- uint64_t
- Output_data::default_alignment_for_size(int size)
- {
- if (size == 32)
- return 4;
- else if (size == 64)
- return 8;
- else
- gold_unreachable();
- }
- // Output_section_header methods. This currently assumes that the
- // segment and section lists are complete at construction time.
- Output_section_headers::Output_section_headers(
- const Layout* layout,
- const Layout::Segment_list* segment_list,
- const Layout::Section_list* section_list,
- const Layout::Section_list* unattached_section_list,
- 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),
- shstrtab_section_(shstrtab_section)
- {
- }
- // Compute the current data size.
- off_t
- Output_section_headers::do_size() const
- {
- // Count all the sections. Start with 1 for the null section.
- off_t count = 1;
- if (!parameters->options().relocatable())
- {
- for (Layout::Segment_list::const_iterator p =
- this->segment_list_->begin();
- p != this->segment_list_->end();
- ++p)
- if ((*p)->type() == elfcpp::PT_LOAD)
- count += (*p)->output_section_count();
- }
- else
- {
- for (Layout::Section_list::const_iterator p =
- this->section_list_->begin();
- p != this->section_list_->end();
- ++p)
- if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0)
- ++count;
- }
- count += this->unattached_section_list_->size();
- const int size = parameters->target().get_size();
- int shdr_size;
- if (size == 32)
- shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
- else if (size == 64)
- shdr_size = elfcpp::Elf_sizes<64>::shdr_size;
- else
- gold_unreachable();
- return count * shdr_size;
- }
- // Write out the section headers.
- void
- Output_section_headers::do_write(Output_file* of)
- {
- switch (parameters->size_and_endianness())
- {
- #ifdef HAVE_TARGET_32_LITTLE
- case Parameters::TARGET_32_LITTLE:
- this->do_sized_write<32, false>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- case Parameters::TARGET_32_BIG:
- this->do_sized_write<32, true>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- case Parameters::TARGET_64_LITTLE:
- this->do_sized_write<64, false>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- case Parameters::TARGET_64_BIG:
- this->do_sized_write<64, true>(of);
- break;
- #endif
- default:
- gold_unreachable();
- }
- }
- template<int size, bool big_endian>
- void
- Output_section_headers::do_sized_write(Output_file* of)
- {
- off_t all_shdrs_size = this->data_size();
- unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size);
- const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
- unsigned char* v = view;
- {
- typename elfcpp::Shdr_write<size, big_endian> oshdr(v);
- oshdr.put_sh_name(0);
- oshdr.put_sh_type(elfcpp::SHT_NULL);
- oshdr.put_sh_flags(0);
- oshdr.put_sh_addr(0);
- oshdr.put_sh_offset(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);
- size_t segment_count = this->segment_list_->size();
- oshdr.put_sh_info(segment_count >= elfcpp::PN_XNUM ? segment_count : 0);
- oshdr.put_sh_addralign(0);
- oshdr.put_sh_entsize(0);
- }
- v += shdr_size;
- unsigned int shndx = 1;
- if (!parameters->options().relocatable())
- {
- for (Layout::Segment_list::const_iterator p =
- this->segment_list_->begin();
- p != this->segment_list_->end();
- ++p)
- v = (*p)->write_section_headers<size, big_endian>(this->layout_,
- this->secnamepool_,
- v,
- &shndx);
- }
- else
- {
- for (Layout::Section_list::const_iterator p =
- this->section_list_->begin();
- p != this->section_list_->end();
- ++p)
- {
- // We do unallocated sections below, except that group
- // sections have to come first.
- if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0
- && (*p)->type() != elfcpp::SHT_GROUP)
- continue;
- gold_assert(shndx == (*p)->out_shndx());
- elfcpp::Shdr_write<size, big_endian> oshdr(v);
- (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
- v += shdr_size;
- ++shndx;
- }
- }
- for (Layout::Section_list::const_iterator p =
- this->unattached_section_list_->begin();
- p != this->unattached_section_list_->end();
- ++p)
- {
- // For a relocatable link, we did unallocated group sections
- // above, since they have to come first.
- if ((*p)->type() == elfcpp::SHT_GROUP
- && parameters->options().relocatable())
- continue;
- gold_assert(shndx == (*p)->out_shndx());
- elfcpp::Shdr_write<size, big_endian> oshdr(v);
- (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
- v += shdr_size;
- ++shndx;
- }
- of->write_output_view(this->offset(), all_shdrs_size, view);
- }
- // Output_segment_header methods.
- Output_segment_headers::Output_segment_headers(
- const Layout::Segment_list& segment_list)
- : segment_list_(segment_list)
- {
- this->set_current_data_size_for_child(this->do_size());
- }
- void
- Output_segment_headers::do_write(Output_file* of)
- {
- switch (parameters->size_and_endianness())
- {
- #ifdef HAVE_TARGET_32_LITTLE
- case Parameters::TARGET_32_LITTLE:
- this->do_sized_write<32, false>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- case Parameters::TARGET_32_BIG:
- this->do_sized_write<32, true>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- case Parameters::TARGET_64_LITTLE:
- this->do_sized_write<64, false>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- case Parameters::TARGET_64_BIG:
- this->do_sized_write<64, true>(of);
- break;
- #endif
- default:
- gold_unreachable();
- }
- }
- template<int size, bool big_endian>
- void
- Output_segment_headers::do_sized_write(Output_file* of)
- {
- const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size;
- off_t all_phdrs_size = this->segment_list_.size() * phdr_size;
- gold_assert(all_phdrs_size == this->data_size());
- unsigned char* view = of->get_output_view(this->offset(),
- all_phdrs_size);
- unsigned char* v = view;
- for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
- p != this->segment_list_.end();
- ++p)
- {
- elfcpp::Phdr_write<size, big_endian> ophdr(v);
- (*p)->write_header(&ophdr);
- v += phdr_size;
- }
- gold_assert(v - view == all_phdrs_size);
- of->write_output_view(this->offset(), all_phdrs_size, view);
- }
- off_t
- Output_segment_headers::do_size() const
- {
- const int size = parameters->target().get_size();
- int phdr_size;
- if (size == 32)
- phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
- else if (size == 64)
- phdr_size = elfcpp::Elf_sizes<64>::phdr_size;
- else
- gold_unreachable();
- return this->segment_list_.size() * phdr_size;
- }
- // Output_file_header methods.
- Output_file_header::Output_file_header(Target* target,
- const Symbol_table* symtab,
- const Output_segment_headers* osh)
- : target_(target),
- symtab_(symtab),
- segment_header_(osh),
- section_header_(NULL),
- shstrtab_(NULL)
- {
- this->set_data_size(this->do_size());
- }
- // Set the section table information for a file header.
- void
- Output_file_header::set_section_info(const Output_section_headers* shdrs,
- const Output_section* shstrtab)
- {
- this->section_header_ = shdrs;
- this->shstrtab_ = shstrtab;
- }
- // Write out the file header.
- void
- Output_file_header::do_write(Output_file* of)
- {
- gold_assert(this->offset() == 0);
- switch (parameters->size_and_endianness())
- {
- #ifdef HAVE_TARGET_32_LITTLE
- case Parameters::TARGET_32_LITTLE:
- this->do_sized_write<32, false>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- case Parameters::TARGET_32_BIG:
- this->do_sized_write<32, true>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- case Parameters::TARGET_64_LITTLE:
- this->do_sized_write<64, false>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- case Parameters::TARGET_64_BIG:
- this->do_sized_write<64, true>(of);
- break;
- #endif
- default:
- gold_unreachable();
- }
- }
- // Write out the file header with appropriate size and endianness.
- template<int size, bool big_endian>
- void
- Output_file_header::do_sized_write(Output_file* of)
- {
- gold_assert(this->offset() == 0);
- int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
- unsigned char* view = of->get_output_view(0, ehdr_size);
- elfcpp::Ehdr_write<size, big_endian> oehdr(view);
- unsigned char e_ident[elfcpp::EI_NIDENT];
- memset(e_ident, 0, elfcpp::EI_NIDENT);
- e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
- e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
- e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
- e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
- if (size == 32)
- e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
- else if (size == 64)
- e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
- else
- gold_unreachable();
- e_ident[elfcpp::EI_DATA] = (big_endian
- ? elfcpp::ELFDATA2MSB
- : elfcpp::ELFDATA2LSB);
- e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
- oehdr.put_e_ident(e_ident);
- elfcpp::ET e_type;
- if (parameters->options().relocatable())
- e_type = elfcpp::ET_REL;
- else if (parameters->options().output_is_position_independent())
- e_type = elfcpp::ET_DYN;
- else
- e_type = elfcpp::ET_EXEC;
- oehdr.put_e_type(e_type);
- oehdr.put_e_machine(this->target_->machine_code());
- oehdr.put_e_version(elfcpp::EV_CURRENT);
- oehdr.put_e_entry(this->entry<size>());
- if (this->segment_header_ == NULL)
- oehdr.put_e_phoff(0);
- else
- oehdr.put_e_phoff(this->segment_header_->offset());
- oehdr.put_e_shoff(this->section_header_->offset());
- oehdr.put_e_flags(this->target_->processor_specific_flags());
- oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
- if (this->segment_header_ == NULL)
- {
- oehdr.put_e_phentsize(0);
- oehdr.put_e_phnum(0);
- }
- else
- {
- oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size);
- size_t phnum = (this->segment_header_->data_size()
- / elfcpp::Elf_sizes<size>::phdr_size);
- if (phnum > elfcpp::PN_XNUM)
- phnum = elfcpp::PN_XNUM;
- oehdr.put_e_phnum(phnum);
- }
- oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
- 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);
- // Let the target adjust the ELF header, e.g., to set EI_OSABI in
- // the e_ident field.
- this->target_->adjust_elf_header(view, ehdr_size);
- of->write_output_view(0, ehdr_size, view);
- }
- // Return the value to use for the entry address.
- template<int size>
- typename elfcpp::Elf_types<size>::Elf_Addr
- Output_file_header::entry()
- {
- const bool should_issue_warning = (parameters->options().entry() != NULL
- && !parameters->options().relocatable()
- && !parameters->options().shared());
- const char* entry = parameters->entry();
- Symbol* sym = this->symtab_->lookup(entry);
- typename Sized_symbol<size>::Value_type v;
- if (sym != NULL)
- {
- Sized_symbol<size>* ssym;
- ssym = this->symtab_->get_sized_symbol<size>(sym);
- if (!ssym->is_defined() && should_issue_warning)
- gold_warning("entry symbol '%s' exists but is not defined", entry);
- v = ssym->value();
- }
- else
- {
- // We couldn't find the entry symbol. See if we can parse it as
- // a number. This supports, e.g., -e 0x1000.
- char* endptr;
- v = strtoull(entry, &endptr, 0);
- if (*endptr != '\0')
- {
- if (should_issue_warning)
- gold_warning("cannot find entry symbol '%s'", entry);
- v = 0;
- }
- }
- return v;
- }
- // Compute the current data size.
- off_t
- Output_file_header::do_size() const
- {
- const int size = parameters->target().get_size();
- if (size == 32)
- return elfcpp::Elf_sizes<32>::ehdr_size;
- else if (size == 64)
- return elfcpp::Elf_sizes<64>::ehdr_size;
- else
- gold_unreachable();
- }
- // Output_data_const methods.
- void
- Output_data_const::do_write(Output_file* of)
- {
- of->write(this->offset(), this->data_.data(), this->data_.size());
- }
- // Output_data_const_buffer methods.
- void
- Output_data_const_buffer::do_write(Output_file* of)
- {
- of->write(this->offset(), this->p_, this->data_size());
- }
- // Output_section_data methods.
- // Record the output section, and set the entry size and such.
- void
- Output_section_data::set_output_section(Output_section* os)
- {
- gold_assert(this->output_section_ == NULL);
- this->output_section_ = os;
- this->do_adjust_output_section(os);
- }
- // Return the section index of the output section.
- unsigned int
- Output_section_data::do_out_shndx() const
- {
- gold_assert(this->output_section_ != NULL);
- 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.
- void
- Output_data_strtab::set_final_data_size()
- {
- this->strtab_->set_string_offsets();
- this->set_data_size(this->strtab_->get_strtab_size());
- }
- // Write out a string table.
- void
- Output_data_strtab::do_write(Output_file* of)
- {
- this->strtab_->write(of, this->offset());
- }
- // Output_reloc methods.
- // A reloc against a global symbol.
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- Symbol* gsym,
- unsigned int type,
- Output_data* od,
- Address address,
- bool is_relative,
- bool is_symbolless,
- bool use_plt_offset)
- : address_(address), local_sym_index_(GSYM_CODE), type_(type),
- is_relative_(is_relative), is_symbolless_(is_symbolless),
- is_section_symbol_(false), use_plt_offset_(use_plt_offset), shndx_(INVALID_CODE)
- {
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.gsym = gsym;
- this->u2_.od = od;
- if (dynamic)
- this->set_needs_dynsym_index();
- }
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- Symbol* gsym,
- unsigned int type,
- Sized_relobj<size, big_endian>* relobj,
- unsigned int shndx,
- Address address,
- bool is_relative,
- bool is_symbolless,
- bool use_plt_offset)
- : address_(address), local_sym_index_(GSYM_CODE), type_(type),
- is_relative_(is_relative), is_symbolless_(is_symbolless),
- is_section_symbol_(false), use_plt_offset_(use_plt_offset), shndx_(shndx)
- {
- gold_assert(shndx != INVALID_CODE);
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.gsym = gsym;
- this->u2_.relobj = relobj;
- if (dynamic)
- this->set_needs_dynsym_index();
- }
- // A reloc against a local symbol.
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- Sized_relobj<size, big_endian>* relobj,
- unsigned int local_sym_index,
- unsigned int type,
- Output_data* od,
- Address address,
- bool is_relative,
- bool is_symbolless,
- bool is_section_symbol,
- bool use_plt_offset)
- : address_(address), local_sym_index_(local_sym_index), type_(type),
- is_relative_(is_relative), is_symbolless_(is_symbolless),
- is_section_symbol_(is_section_symbol), use_plt_offset_(use_plt_offset),
- shndx_(INVALID_CODE)
- {
- gold_assert(local_sym_index != GSYM_CODE
- && local_sym_index != INVALID_CODE);
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.relobj = relobj;
- this->u2_.od = od;
- if (dynamic)
- this->set_needs_dynsym_index();
- }
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- Sized_relobj<size, big_endian>* relobj,
- unsigned int local_sym_index,
- unsigned int type,
- unsigned int shndx,
- Address address,
- bool is_relative,
- bool is_symbolless,
- bool is_section_symbol,
- bool use_plt_offset)
- : address_(address), local_sym_index_(local_sym_index), type_(type),
- is_relative_(is_relative), is_symbolless_(is_symbolless),
- is_section_symbol_(is_section_symbol), use_plt_offset_(use_plt_offset),
- shndx_(shndx)
- {
- gold_assert(local_sym_index != GSYM_CODE
- && local_sym_index != INVALID_CODE);
- gold_assert(shndx != INVALID_CODE);
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.relobj = relobj;
- this->u2_.relobj = relobj;
- if (dynamic)
- this->set_needs_dynsym_index();
- }
- // A reloc against the STT_SECTION symbol of an output section.
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- Output_section* os,
- unsigned int type,
- Output_data* od,
- Address address,
- bool is_relative)
- : address_(address), local_sym_index_(SECTION_CODE), type_(type),
- is_relative_(is_relative), is_symbolless_(is_relative),
- is_section_symbol_(true), use_plt_offset_(false), shndx_(INVALID_CODE)
- {
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.os = os;
- this->u2_.od = od;
- if (dynamic)
- this->set_needs_dynsym_index();
- else
- os->set_needs_symtab_index();
- }
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- Output_section* os,
- unsigned int type,
- Sized_relobj<size, big_endian>* relobj,
- unsigned int shndx,
- Address address,
- bool is_relative)
- : address_(address), local_sym_index_(SECTION_CODE), type_(type),
- is_relative_(is_relative), is_symbolless_(is_relative),
- is_section_symbol_(true), use_plt_offset_(false), shndx_(shndx)
- {
- gold_assert(shndx != INVALID_CODE);
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.os = os;
- this->u2_.relobj = relobj;
- if (dynamic)
- this->set_needs_dynsym_index();
- else
- os->set_needs_symtab_index();
- }
- // An absolute or relative relocation.
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- unsigned int type,
- Output_data* od,
- Address address,
- bool is_relative)
- : address_(address), local_sym_index_(0), type_(type),
- is_relative_(is_relative), is_symbolless_(false),
- is_section_symbol_(false), use_plt_offset_(false), shndx_(INVALID_CODE)
- {
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.relobj = NULL;
- this->u2_.od = od;
- }
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- unsigned int type,
- Sized_relobj<size, big_endian>* relobj,
- unsigned int shndx,
- Address address,
- bool is_relative)
- : address_(address), local_sym_index_(0), type_(type),
- is_relative_(is_relative), is_symbolless_(false),
- is_section_symbol_(false), use_plt_offset_(false), shndx_(shndx)
- {
- gold_assert(shndx != INVALID_CODE);
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.relobj = NULL;
- this->u2_.relobj = relobj;
- }
- // A target specific relocation.
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- unsigned int type,
- void* arg,
- Output_data* od,
- Address address)
- : address_(address), local_sym_index_(TARGET_CODE), type_(type),
- is_relative_(false), is_symbolless_(false),
- is_section_symbol_(false), use_plt_offset_(false), shndx_(INVALID_CODE)
- {
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.arg = arg;
- this->u2_.od = od;
- }
- template<bool dynamic, int size, bool big_endian>
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
- unsigned int type,
- void* arg,
- Sized_relobj<size, big_endian>* relobj,
- unsigned int shndx,
- Address address)
- : address_(address), local_sym_index_(TARGET_CODE), type_(type),
- is_relative_(false), is_symbolless_(false),
- is_section_symbol_(false), use_plt_offset_(false), shndx_(shndx)
- {
- gold_assert(shndx != INVALID_CODE);
- // this->type_ is a bitfield; make sure TYPE fits.
- gold_assert(this->type_ == type);
- this->u1_.arg = arg;
- this->u2_.relobj = relobj;
- }
- // Record that we need a dynamic symbol index for this relocation.
- template<bool dynamic, int size, bool big_endian>
- void
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::
- set_needs_dynsym_index()
- {
- if (this->is_symbolless_)
- return;
- switch (this->local_sym_index_)
- {
- case INVALID_CODE:
- gold_unreachable();
- case GSYM_CODE:
- this->u1_.gsym->set_needs_dynsym_entry();
- break;
- case SECTION_CODE:
- this->u1_.os->set_needs_dynsym_index();
- break;
- case TARGET_CODE:
- // The target must take care of this if necessary.
- break;
- case 0:
- break;
- default:
- {
- const unsigned int lsi = this->local_sym_index_;
- Sized_relobj_file<size, big_endian>* relobj =
- this->u1_.relobj->sized_relobj();
- gold_assert(relobj != NULL);
- if (!this->is_section_symbol_)
- relobj->set_needs_output_dynsym_entry(lsi);
- else
- relobj->output_section(lsi)->set_needs_dynsym_index();
- }
- break;
- }
- }
- // Get the symbol index of a relocation.
- template<bool dynamic, int size, bool big_endian>
- unsigned int
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_symbol_index()
- const
- {
- unsigned int index;
- if (this->is_symbolless_)
- return 0;
- switch (this->local_sym_index_)
- {
- case INVALID_CODE:
- gold_unreachable();
- case GSYM_CODE:
- if (this->u1_.gsym == NULL)
- index = 0;
- else if (dynamic)
- index = this->u1_.gsym->dynsym_index();
- else
- index = this->u1_.gsym->symtab_index();
- break;
- case SECTION_CODE:
- if (dynamic)
- index = this->u1_.os->dynsym_index();
- else
- index = this->u1_.os->symtab_index();
- break;
- case TARGET_CODE:
- index = parameters->target().reloc_symbol_index(this->u1_.arg,
- this->type_);
- break;
- case 0:
- // Relocations without symbols use a symbol index of 0.
- index = 0;
- break;
- default:
- {
- const unsigned int lsi = this->local_sym_index_;
- Sized_relobj_file<size, big_endian>* relobj =
- this->u1_.relobj->sized_relobj();
- gold_assert(relobj != NULL);
- if (!this->is_section_symbol_)
- {
- if (dynamic)
- index = relobj->dynsym_index(lsi);
- else
- index = relobj->symtab_index(lsi);
- }
- else
- {
- Output_section* os = relobj->output_section(lsi);
- gold_assert(os != NULL);
- if (dynamic)
- index = os->dynsym_index();
- else
- index = os->symtab_index();
- }
- }
- break;
- }
- gold_assert(index != -1U);
- return index;
- }
- // For a local section symbol, get the address of the offset ADDEND
- // within the input section.
- template<bool dynamic, int size, bool big_endian>
- typename elfcpp::Elf_types<size>::Elf_Addr
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::
- local_section_offset(Addend addend) const
- {
- gold_assert(this->local_sym_index_ != GSYM_CODE
- && this->local_sym_index_ != SECTION_CODE
- && this->local_sym_index_ != TARGET_CODE
- && this->local_sym_index_ != INVALID_CODE
- && this->local_sym_index_ != 0
- && this->is_section_symbol_);
- const unsigned int lsi = this->local_sym_index_;
- Output_section* os = this->u1_.relobj->output_section(lsi);
- gold_assert(os != NULL);
- Address offset = this->u1_.relobj->get_output_section_offset(lsi);
- if (offset != invalid_address)
- return offset + addend;
- // This is a merge section.
- Sized_relobj_file<size, big_endian>* relobj =
- this->u1_.relobj->sized_relobj();
- gold_assert(relobj != NULL);
- offset = os->output_address(relobj, lsi, addend);
- gold_assert(offset != invalid_address);
- return offset;
- }
- // Get the output address of a relocation.
- template<bool dynamic, int size, bool big_endian>
- 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)
- {
- Output_section* os = this->u2_.relobj->output_section(this->shndx_);
- gold_assert(os != NULL);
- Address off = this->u2_.relobj->get_output_section_offset(this->shndx_);
- if (off != invalid_address)
- address += os->address() + off;
- else
- {
- Sized_relobj_file<size, big_endian>* relobj =
- this->u2_.relobj->sized_relobj();
- gold_assert(relobj != NULL);
- address = os->output_address(relobj, this->shndx_, address);
- gold_assert(address != invalid_address);
- }
- }
- else if (this->u2_.od != NULL)
- address += this->u2_.od->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->get_symbol_index();
- wr->put_r_info(elfcpp::elf_r_info<size>(sym_index, this->type_));
- }
- // Write out a Rel relocation.
- template<bool dynamic, int size, bool big_endian>
- void
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write(
- unsigned char* pov) const
- {
- elfcpp::Rel_write<size, big_endian> orel(pov);
- this->write_rel(&orel);
- }
- // Get the value of the symbol referred to by a Rel relocation.
- template<bool dynamic, int size, bool big_endian>
- typename elfcpp::Elf_types<size>::Elf_Addr
- Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::symbol_value(
- Addend addend) const
- {
- if (this->local_sym_index_ == GSYM_CODE)
- {
- const Sized_symbol<size>* sym;
- sym = static_cast<const Sized_symbol<size>*>(this->u1_.gsym);
- if (this->use_plt_offset_ && sym->has_plt_offset())
- return parameters->target().plt_address_for_global(sym);
- else
- return sym->value() + addend;
- }
- if (this->local_sym_index_ == SECTION_CODE)
- {
- gold_assert(!this->use_plt_offset_);
- return this->u1_.os->address() + addend;
- }
- gold_assert(this->local_sym_index_ != TARGET_CODE
- && this->local_sym_index_ != INVALID_CODE
- && this->local_sym_index_ != 0
- && !this->is_section_symbol_);
- const unsigned int lsi = this->local_sym_index_;
- Sized_relobj_file<size, big_endian>* relobj =
- this->u1_.relobj->sized_relobj();
- gold_assert(relobj != NULL);
- if (this->use_plt_offset_)
- return parameters->target().plt_address_for_local(relobj, lsi);
- const Symbol_value<size>* symval = relobj->local_symbol(lsi);
- return symval->value(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>
- void
- Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>::write(
- unsigned char* pov) const
- {
- elfcpp::Rela_write<size, big_endian> orel(pov);
- this->rel_.write_rel(&orel);
- Addend addend = this->addend_;
- if (this->rel_.is_target_specific())
- addend = parameters->target().reloc_addend(this->rel_.target_arg(),
- this->rel_.type(), addend);
- else if (this->rel_.is_symbolless())
- addend = this->rel_.symbol_value(addend);
- else if (this->rel_.is_local_section_symbol())
- addend = this->rel_.local_section_offset(addend);
- orel.put_r_addend(addend);
- }
- // Output_data_reloc_base methods.
- // Adjust the output section.
- template<int sh_type, bool dynamic, int size, bool big_endian>
- void
- Output_data_reloc_base<sh_type, dynamic, size, big_endian>
- ::do_adjust_output_section(Output_section* os)
- {
- if (sh_type == elfcpp::SHT_REL)
- os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
- else if (sh_type == elfcpp::SHT_RELA)
- os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
- else
- gold_unreachable();
- // 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();
- }
- // Standard relocation writer, which just calls Output_reloc::write().
- template<int sh_type, bool dynamic, int size, bool big_endian>
- struct Output_reloc_writer
- {
- typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type;
- typedef std::vector<Output_reloc_type> Relocs;
- static void
- write(typename Relocs::const_iterator p, unsigned char* pov)
- { p->write(pov); }
- };
- // Write out relocation data.
- template<int sh_type, bool dynamic, int size, bool big_endian>
- void
- Output_data_reloc_base<sh_type, dynamic, size, big_endian>::do_write(
- Output_file* of)
- {
- typedef Output_reloc_writer<sh_type, dynamic, size, big_endian> Writer;
- this->do_write_generic<Writer>(of);
- }
- // Class Output_relocatable_relocs.
- template<int sh_type, int size, bool big_endian>
- void
- Output_relocatable_relocs<sh_type, size, big_endian>::set_final_data_size()
- {
- this->set_data_size(this->rr_->output_reloc_count()
- * Reloc_types<sh_type, size, big_endian>::reloc_size);
- }
- // class Output_data_group.
- template<int size, bool big_endian>
- Output_data_group<size, big_endian>::Output_data_group(
- Sized_relobj_file<size, big_endian>* relobj,
- section_size_type entry_count,
- elfcpp::Elf_Word flags,
- std::vector<unsigned int>* input_shndxes)
- : Output_section_data(entry_count * 4, 4, false),
- relobj_(relobj),
- flags_(flags)
- {
- this->input_shndxes_.swap(*input_shndxes);
- }
- // Write out the section group, which means translating the section
- // indexes to apply to the output file.
- template<int size, bool big_endian>
- void
- Output_data_group<size, big_endian>::do_write(Output_file* of)
- {
- const off_t off = this->offset();
- const section_size_type oview_size =
- convert_to_section_size_type(this->data_size());
- unsigned char* const oview = of->get_output_view(off, oview_size);
- elfcpp::Elf_Word* contents = reinterpret_cast<elfcpp::Elf_Word*>(oview);
- elfcpp::Swap<32, big_endian>::writeval(contents, this->flags_);
- ++contents;
- for (std::vector<unsigned int>::const_iterator p =
- this->input_shndxes_.begin();
- p != this->input_shndxes_.end();
- ++p, ++contents)
- {
- Output_section* os = this->relobj_->output_section(*p);
- unsigned int output_shndx;
- if (os != NULL)
- output_shndx = os->out_shndx();
- else
- {
- this->relobj_->error(_("section group retained but "
- "group element discarded"));
- output_shndx = 0;
- }
- elfcpp::Swap<32, big_endian>::writeval(contents, output_shndx);
- }
- size_t wrote = reinterpret_cast<unsigned char*>(contents) - oview;
- gold_assert(wrote == oview_size);
- of->write_output_view(off, oview_size, oview);
- // We no longer need this information.
- this->input_shndxes_.clear();
- }
- // Output_data_got::Got_entry methods.
- // Write out the entry.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::Got_entry::write(
- Output_data_got_base* got,
- unsigned int got_indx,
- unsigned char* pov) const
- {
- Valtype val = 0;
- switch (this->local_sym_index_)
- {
- case GSYM_CODE:
- {
- // If the symbol is resolved locally, we need to write out the
- // link-time value, which will be relocated dynamically by a
- // RELATIVE relocation.
- Symbol* gsym = this->u_.gsym;
- if (this->use_plt_or_tls_offset_ && gsym->has_plt_offset())
- val = parameters->target().plt_address_for_global(gsym);
- else
- {
- switch (parameters->size_and_endianness())
- {
- #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
- case Parameters::TARGET_32_LITTLE:
- case Parameters::TARGET_32_BIG:
- {
- // This cast is ugly. We don't want to put a
- // virtual method in Symbol, because we want Symbol
- // to be as small as possible.
- Sized_symbol<32>::Value_type v;
- v = static_cast<Sized_symbol<32>*>(gsym)->value();
- val = convert_types<Valtype, Sized_symbol<32>::Value_type>(v);
- }
- break;
- #endif
- #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
- case Parameters::TARGET_64_LITTLE:
- case Parameters::TARGET_64_BIG:
- {
- Sized_symbol<64>::Value_type v;
- v = static_cast<Sized_symbol<64>*>(gsym)->value();
- val = convert_types<Valtype, Sized_symbol<64>::Value_type>(v);
- }
- break;
- #endif
- default:
- gold_unreachable();
- }
- // If this is a GOT entry for a known value global symbol,
- // then the value should include the addend. If the value
- // is not known leave the value as zero; The GOT entry
- // will be set by a dynamic relocation.
- if (this->addend_ && gsym->final_value_is_known())
- val += this->addend_;
- if (this->use_plt_or_tls_offset_
- && gsym->type() == elfcpp::STT_TLS)
- val += parameters->target().tls_offset_for_global(gsym,
- got, got_indx,
- this->addend_);
- }
- }
- break;
- case CONSTANT_CODE:
- val = this->u_.constant;
- break;
- case RESERVED_CODE:
- // If we're doing an incremental update, don't touch this GOT entry.
- if (parameters->incremental_update())
- return;
- val = this->u_.constant;
- break;
- default:
- {
- const Relobj* object = this->u_.object;
- const unsigned int lsi = this->local_sym_index_;
- bool is_tls = object->local_is_tls(lsi);
- if (this->use_plt_or_tls_offset_ && !is_tls)
- val = parameters->target().plt_address_for_local(object, lsi);
- else
- {
- uint64_t lval = object->local_symbol_value(lsi, this->addend_);
- val = convert_types<Valtype, uint64_t>(lval);
- if (this->use_plt_or_tls_offset_ && is_tls)
- val += parameters->target().tls_offset_for_local(object, lsi,
- got, got_indx,
- this->addend_);
- }
- }
- break;
- }
- elfcpp::Swap<got_size, big_endian>::writeval(pov, val);
- }
- // Output_data_got methods.
- // Add an entry for a global symbol to the GOT. This returns true if
- // this is a new GOT entry, false if the symbol already had a GOT
- // entry.
- template<int got_size, bool big_endian>
- bool
- Output_data_got<got_size, big_endian>::add_global(Symbol* gsym,
- unsigned int got_type,
- uint64_t addend)
- {
- if (gsym->has_got_offset(got_type, addend))
- return false;
- unsigned int got_offset = this->add_got_entry(Got_entry(gsym, false, addend));
- gsym->set_got_offset(got_type, got_offset, addend);
- return true;
- }
- // Like add_global, but use the PLT offset.
- template<int got_size, bool big_endian>
- bool
- Output_data_got<got_size, big_endian>::add_global_plt(Symbol* gsym,
- unsigned int got_type,
- uint64_t addend)
- {
- if (gsym->has_got_offset(got_type, addend))
- return false;
- unsigned int got_offset = this->add_got_entry(Got_entry(gsym, true, addend));
- gsym->set_got_offset(got_type, got_offset, addend);
- 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 got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::add_global_with_rel(
- Symbol* gsym,
- unsigned int got_type,
- Output_data_reloc_generic* rel_dyn,
- unsigned int r_type,
- uint64_t addend)
- {
- if (gsym->has_got_offset(got_type, addend))
- return;
- unsigned int got_offset = this->add_got_entry(Got_entry());
- gsym->set_got_offset(got_type, got_offset, addend);
- rel_dyn->add_global_generic(gsym, r_type, this, got_offset, addend);
- }
- // Add a pair of entries for a global symbol to the GOT, and add
- // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
- // If R_TYPE_2 == 0, add the second entry with no relocation.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::add_global_pair_with_rel(
- Symbol* gsym,
- unsigned int got_type,
- Output_data_reloc_generic* rel_dyn,
- unsigned int r_type_1,
- unsigned int r_type_2,
- uint64_t addend)
- {
- if (gsym->has_got_offset(got_type, addend))
- return;
- unsigned int got_offset = this->add_got_entry_pair(Got_entry(), Got_entry());
- gsym->set_got_offset(got_type, got_offset, addend);
- rel_dyn->add_global_generic(gsym, r_type_1, this, got_offset, addend);
- if (r_type_2 != 0)
- rel_dyn->add_global_generic(gsym, r_type_2, this,
- got_offset + got_size / 8, addend);
- }
- // Add an entry for a local symbol plus ADDEND to the GOT. This returns
- // true if this is a new GOT entry, false if the symbol already has a GOT
- // entry.
- template<int got_size, bool big_endian>
- bool
- Output_data_got<got_size, big_endian>::add_local(
- Relobj* object,
- unsigned int symndx,
- unsigned int got_type,
- uint64_t addend)
- {
- if (object->local_has_got_offset(symndx, got_type, addend))
- return false;
- unsigned int got_offset = this->add_got_entry(Got_entry(object, symndx,
- false, addend));
- object->set_local_got_offset(symndx, got_type, got_offset, addend);
- return true;
- }
- // Like add_local, but use the PLT offset.
- template<int got_size, bool big_endian>
- bool
- Output_data_got<got_size, big_endian>::add_local_plt(
- Relobj* object,
- unsigned int symndx,
- unsigned int got_type,
- uint64_t addend)
- {
- if (object->local_has_got_offset(symndx, got_type, addend))
- return false;
- unsigned int got_offset = this->add_got_entry(Got_entry(object, symndx,
- true, addend));
- object->set_local_got_offset(symndx, got_type, got_offset, addend);
- return true;
- }
- // Add an entry for a local symbol plus ADDEND to the GOT, and add a dynamic
- // relocation of type R_TYPE for the GOT entry.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::add_local_with_rel(
- Relobj* object,
- unsigned int symndx,
- unsigned int got_type,
- Output_data_reloc_generic* rel_dyn,
- unsigned int r_type,
- uint64_t addend)
- {
- if (object->local_has_got_offset(symndx, got_type, addend))
- return;
- unsigned int got_offset = this->add_got_entry(Got_entry());
- object->set_local_got_offset(symndx, got_type, got_offset, addend);
- rel_dyn->add_local_generic(object, symndx, r_type, this, got_offset,
- addend);
- }
- // Add a pair of entries for a local symbol plus ADDEND to the GOT, and add
- // a dynamic relocation of type R_TYPE using the section symbol of
- // the output section to which input section SHNDX maps, on the first.
- // The first got entry will have a value of zero, the second the
- // value of the local symbol.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::add_local_pair_with_rel(
- Relobj* object,
- unsigned int symndx,
- unsigned int shndx,
- unsigned int got_type,
- Output_data_reloc_generic* rel_dyn,
- unsigned int r_type,
- uint64_t addend)
- {
- if (object->local_has_got_offset(symndx, got_type, addend))
- return;
- unsigned int got_offset =
- this->add_got_entry_pair(Got_entry(),
- Got_entry(object, symndx, false, addend));
- object->set_local_got_offset(symndx, got_type, got_offset, addend);
- Output_section* os = object->output_section(shndx);
- rel_dyn->add_output_section_generic(os, r_type, this, got_offset, addend);
- }
- // Add a pair of entries for a local symbol to the GOT, and add
- // a dynamic relocation of type R_TYPE using STN_UNDEF on the first.
- // The first got entry will have a value of zero, the second the
- // value of the local symbol offset by Target::tls_offset_for_local.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::add_local_tls_pair(
- Relobj* object,
- unsigned int symndx,
- unsigned int got_type,
- Output_data_reloc_generic* rel_dyn,
- unsigned int r_type,
- uint64_t addend)
- {
- if (object->local_has_got_offset(symndx, got_type, addend))
- return;
- unsigned int got_offset
- = this->add_got_entry_pair(Got_entry(),
- Got_entry(object, symndx, true, addend));
- object->set_local_got_offset(symndx, got_type, got_offset, addend);
- rel_dyn->add_local_generic(object, 0, r_type, this, got_offset, addend);
- }
- // Reserve a slot in the GOT for a local symbol or the second slot of a pair.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::reserve_local(
- unsigned int i,
- Relobj* object,
- unsigned int sym_index,
- unsigned int got_type,
- uint64_t addend)
- {
- this->do_reserve_slot(i);
- object->set_local_got_offset(sym_index, got_type, this->got_offset(i), addend);
- }
- // Reserve a slot in the GOT for a global symbol.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::reserve_global(
- unsigned int i,
- Symbol* gsym,
- unsigned int got_type,
- uint64_t addend)
- {
- this->do_reserve_slot(i);
- gsym->set_got_offset(got_type, this->got_offset(i), addend);
- }
- // Write out the GOT.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::do_write(Output_file* of)
- {
- const int add = got_size / 8;
- const off_t off = this->offset();
- const off_t oview_size = this->data_size();
- unsigned char* const oview = of->get_output_view(off, oview_size);
- unsigned char* pov = oview;
- for (unsigned int i = 0; i < this->entries_.size(); ++i)
- {
- this->entries_[i].write(this, i, pov);
- pov += add;
- }
- gold_assert(pov - oview == oview_size);
- of->write_output_view(off, oview_size, oview);
- // We no longer need the GOT entries.
- this->entries_.clear();
- }
- // Create a new GOT entry and return its offset.
- template<int got_size, bool big_endian>
- unsigned int
- Output_data_got<got_size, big_endian>::add_got_entry(Got_entry got_entry)
- {
- if (!this->is_data_size_valid())
- {
- this->entries_.push_back(got_entry);
- this->set_got_size();
- return this->last_got_offset();
- }
- else
- {
- // For an incremental update, find an available slot.
- off_t got_offset = this->free_list_.allocate(got_size / 8,
- got_size / 8, 0);
- if (got_offset == -1)
- gold_fallback(_("out of patch space (GOT);"
- " relink with --incremental-full"));
- unsigned int got_index = got_offset / (got_size / 8);
- gold_assert(got_index < this->entries_.size());
- this->entries_[got_index] = got_entry;
- return static_cast<unsigned int>(got_offset);
- }
- }
- // Create a pair of new GOT entries and return the offset of the first.
- template<int got_size, bool big_endian>
- unsigned int
- Output_data_got<got_size, big_endian>::add_got_entry_pair(
- Got_entry got_entry_1,
- Got_entry got_entry_2)
- {
- if (!this->is_data_size_valid())
- {
- unsigned int got_offset;
- this->entries_.push_back(got_entry_1);
- got_offset = this->last_got_offset();
- this->entries_.push_back(got_entry_2);
- this->set_got_size();
- return got_offset;
- }
- else
- {
- // For an incremental update, find an available pair of slots.
- off_t got_offset = this->free_list_.allocate(2 * got_size / 8,
- got_size / 8, 0);
- if (got_offset == -1)
- gold_fallback(_("out of patch space (GOT);"
- " relink with --incremental-full"));
- unsigned int got_index = got_offset / (got_size / 8);
- gold_assert(got_index < this->entries_.size());
- this->entries_[got_index] = got_entry_1;
- this->entries_[got_index + 1] = got_entry_2;
- return static_cast<unsigned int>(got_offset);
- }
- }
- // Replace GOT entry I with a new value.
- template<int got_size, bool big_endian>
- void
- Output_data_got<got_size, big_endian>::replace_got_entry(
- unsigned int i,
- Got_entry got_entry)
- {
- gold_assert(i < this->entries_.size());
- this->entries_[i] = got_entry;
- }
- // Output_data_dynamic::Dynamic_entry methods.
- // Write out the entry.
- template<int size, bool big_endian>
- void
- Output_data_dynamic::Dynamic_entry::write(
- unsigned char* pov,
- const Stringpool* pool) const
- {
- typename elfcpp::Elf_types<size>::Elf_WXword val;
- switch (this->offset_)
- {
- case DYNAMIC_NUMBER:
- val = this->u_.val;
- break;
- case DYNAMIC_SECTION_SIZE:
- val = this->u_.od->data_size();
- if (this->od2 != NULL)
- val += this->od2->data_size();
- break;
- case DYNAMIC_SYMBOL:
- {
- const Sized_symbol<size>* s =
- static_cast<const Sized_symbol<size>*>(this->u_.sym);
- val = s->value();
- }
- break;
- case DYNAMIC_STRING:
- val = pool->get_offset(this->u_.str);
- break;
- case DYNAMIC_CUSTOM:
- val = parameters->target().dynamic_tag_custom_value(this->tag_);
- break;
- default:
- val = this->u_.od->address() + this->offset_;
- break;
- }
- elfcpp::Dyn_write<size, big_endian> dw(pov);
- dw.put_d_tag(this->tag_);
- dw.put_d_val(val);
- }
- // Output_data_dynamic methods.
- // Adjust the output section to set the entry size.
- void
- Output_data_dynamic::do_adjust_output_section(Output_section* os)
- {
- if (parameters->target().get_size() == 32)
- os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size);
- else if (parameters->target().get_size() == 64)
- os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size);
- else
- gold_unreachable();
- }
- // Get a dynamic entry offset.
- unsigned int
- Output_data_dynamic::get_entry_offset(elfcpp::DT tag) const
- {
- int dyn_size;
- if (parameters->target().get_size() == 32)
- dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
- else if (parameters->target().get_size() == 64)
- dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
- else
- gold_unreachable();
- for (size_t i = 0; i < entries_.size(); ++i)
- if (entries_[i].tag() == tag)
- return i * dyn_size;
- return -1U;
- }
- // Set the final data size.
- void
- Output_data_dynamic::set_final_data_size()
- {
- // Add the terminating entry if it hasn't been added.
- // Because of relaxation, we can run this multiple times.
- if (this->entries_.empty() || this->entries_.back().tag() != elfcpp::DT_NULL)
- {
- int extra = parameters->options().spare_dynamic_tags();
- for (int i = 0; i < extra; ++i)
- this->add_constant(elfcpp::DT_NULL, 0);
- this->add_constant(elfcpp::DT_NULL, 0);
- }
- int dyn_size;
- if (parameters->target().get_size() == 32)
- dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
- else if (parameters->target().get_size() == 64)
- dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
- else
- gold_unreachable();
- this->set_data_size(this->entries_.size() * dyn_size);
- }
- // Write out the dynamic entries.
- void
- Output_data_dynamic::do_write(Output_file* of)
- {
- switch (parameters->size_and_endianness())
- {
- #ifdef HAVE_TARGET_32_LITTLE
- case Parameters::TARGET_32_LITTLE:
- this->sized_write<32, false>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- case Parameters::TARGET_32_BIG:
- this->sized_write<32, true>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- case Parameters::TARGET_64_LITTLE:
- this->sized_write<64, false>(of);
- break;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- case Parameters::TARGET_64_BIG:
- this->sized_write<64, true>(of);
- break;
- #endif
- default:
- gold_unreachable();
- }
- }
- template<int size, bool big_endian>
- void
- Output_data_dynamic::sized_write(Output_file* of)
- {
- const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size;
- 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);
- unsigned char* pov = oview;
- for (typename Dynamic_entries::const_iterator p = this->entries_.begin();
- p != this->entries_.end();
- ++p)
- {
- p->write<size, big_endian>(pov, this->pool_);
- pov += dyn_size;
- }
- gold_assert(pov - oview == oview_size);
- of->write_output_view(offset, oview_size, oview);
- // We no longer need the dynamic entries.
- 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)
- {
- unsigned int symndx = p->first;
- gold_assert(static_cast<off_t>(symndx) * 4 < this->data_size());
- elfcpp::Swap<32, big_endian>::writeval(oview + symndx * 4, p->second);
- }
- }
- // Output_fill_debug_info methods.
- // Return the minimum size needed for a dummy compilation unit header.
- size_t
- Output_fill_debug_info::do_minimum_hole_size() const
- {
- // Compile unit header fields: unit_length, version, debug_abbrev_offset,
- // address_size.
- const size_t len = 4 + 2 + 4 + 1;
- // For type units, add type_signature, type_offset.
- if (this->is_debug_types_)
- return len + 8 + 4;
- return len;
- }
- // Write a dummy compilation unit header to fill a hole in the
- // .debug_info or .debug_types section.
- void
- Output_fill_debug_info::do_write(Output_file* of, off_t off, size_t len) const
- {
- gold_debug(DEBUG_INCREMENTAL, "fill_debug_info(%08lx, %08lx)",
- static_cast<long>(off), static_cast<long>(len));
- gold_assert(len >= this->do_minimum_hole_size());
- unsigned char* const oview = of->get_output_view(off, len);
- unsigned char* pov = oview;
- // Write header fields: unit_length, version, debug_abbrev_offset,
- // address_size.
- if (this->is_big_endian())
- {
- elfcpp::Swap_unaligned<32, true>::writeval(pov, len - 4);
- elfcpp::Swap_unaligned<16, true>::writeval(pov + 4, this->version);
- elfcpp::Swap_unaligned<32, true>::writeval(pov + 6, 0);
- }
- else
- {
- elfcpp::Swap_unaligned<32, false>::writeval(pov, len - 4);
- elfcpp::Swap_unaligned<16, false>::writeval(pov + 4, this->version);
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 6, 0);
- }
- pov += 4 + 2 + 4;
- *pov++ = 4;
- // For type units, the additional header fields -- type_signature,
- // type_offset -- can be filled with zeroes.
- // Fill the remainder of the free space with zeroes. The first
- // zero should tell the consumer there are no DIEs to read in this
- // compilation unit.
- if (pov < oview + len)
- memset(pov, 0, oview + len - pov);
- of->write_output_view(off, len, oview);
- }
- // Output_fill_debug_line methods.
- // Return the minimum size needed for a dummy line number program header.
- size_t
- Output_fill_debug_line::do_minimum_hole_size() const
- {
- // Line number program header fields: unit_length, version, header_length,
- // minimum_instruction_length, default_is_stmt, line_base, line_range,
- // opcode_base, standard_opcode_lengths[], include_directories, filenames.
- const size_t len = 4 + 2 + 4 + this->header_length;
- return len;
- }
- // Write a dummy line number program header to fill a hole in the
- // .debug_line section.
- void
- Output_fill_debug_line::do_write(Output_file* of, off_t off, size_t len) const
- {
- gold_debug(DEBUG_INCREMENTAL, "fill_debug_line(%08lx, %08lx)",
- static_cast<long>(off), static_cast<long>(len));
- gold_assert(len >= this->do_minimum_hole_size());
- unsigned char* const oview = of->get_output_view(off, len);
- unsigned char* pov = oview;
- // Write header fields: unit_length, version, header_length,
- // minimum_instruction_length, default_is_stmt, line_base, line_range,
- // opcode_base, standard_opcode_lengths[], include_directories, filenames.
- // We set the header_length field to cover the entire hole, so the
- // line number program is empty.
- if (this->is_big_endian())
- {
- elfcpp::Swap_unaligned<32, true>::writeval(pov, len - 4);
- elfcpp::Swap_unaligned<16, true>::writeval(pov + 4, this->version);
- elfcpp::Swap_unaligned<32, true>::writeval(pov + 6, len - (4 + 2 + 4));
- }
- else
- {
- elfcpp::Swap_unaligned<32, false>::writeval(pov, len - 4);
- elfcpp::Swap_unaligned<16, false>::writeval(pov + 4, this->version);
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 6, len - (4 + 2 + 4));
- }
- pov += 4 + 2 + 4;
- *pov++ = 1; // minimum_instruction_length
- *pov++ = 0; // default_is_stmt
- *pov++ = 0; // line_base
- *pov++ = 5; // line_range
- *pov++ = 13; // opcode_base
- *pov++ = 0; // standard_opcode_lengths[1]
- *pov++ = 1; // standard_opcode_lengths[2]
- *pov++ = 1; // standard_opcode_lengths[3]
- *pov++ = 1; // standard_opcode_lengths[4]
- *pov++ = 1; // standard_opcode_lengths[5]
- *pov++ = 0; // standard_opcode_lengths[6]
- *pov++ = 0; // standard_opcode_lengths[7]
- *pov++ = 0; // standard_opcode_lengths[8]
- *pov++ = 1; // standard_opcode_lengths[9]
- *pov++ = 0; // standard_opcode_lengths[10]
- *pov++ = 0; // standard_opcode_lengths[11]
- *pov++ = 1; // standard_opcode_lengths[12]
- *pov++ = 0; // include_directories (empty)
- *pov++ = 0; // filenames (empty)
- // Some consumers don't check the header_length field, and simply
- // start reading the line number program immediately following the
- // header. For those consumers, we fill the remainder of the free
- // space with DW_LNS_set_basic_block opcodes. These are effectively
- // no-ops: the resulting line table program will not create any rows.
- if (pov < oview + len)
- memset(pov, elfcpp::DW_LNS_set_basic_block, oview + len - pov);
- of->write_output_view(off, len, oview);
- }
- // Output_section::Input_section methods.
- // Return the current data size. For an input section we store the size here.
- // For an Output_section_data, we have to ask it for the size.
- off_t
- Output_section::Input_section::current_data_size() const
- {
- if (this->is_input_section())
- return this->u1_.data_size;
- else
- {
- this->u2_.posd->pre_finalize_data_size();
- return this->u2_.posd->current_data_size();
- }
- }
- // Return the data size. For an input section we store the size here.
- // For an Output_section_data, we have to ask it for the size.
- off_t
- Output_section::Input_section::data_size() const
- {
- if (this->is_input_section())
- return this->u1_.data_size;
- else
- return this->u2_.posd->data_size();
- }
- // Return the object for an input section.
- Relobj*
- Output_section::Input_section::relobj() const
- {
- if (this->is_input_section())
- return this->u2_.object;
- else if (this->is_merge_section())
- {
- gold_assert(this->u2_.pomb->first_relobj() != NULL);
- return this->u2_.pomb->first_relobj();
- }
- else if (this->is_relaxed_input_section())
- return this->u2_.poris->relobj();
- else
- gold_unreachable();
- }
- // Return the input section index for an input section.
- unsigned int
- Output_section::Input_section::shndx() const
- {
- if (this->is_input_section())
- return this->shndx_;
- else if (this->is_merge_section())
- {
- gold_assert(this->u2_.pomb->first_relobj() != NULL);
- return this->u2_.pomb->first_shndx();
- }
- else if (this->is_relaxed_input_section())
- return this->u2_.poris->shndx();
- else
- gold_unreachable();
- }
- // Set the address and file offset.
- void
- Output_section::Input_section::set_address_and_file_offset(
- uint64_t address,
- off_t file_offset,
- off_t section_file_offset)
- {
- if (this->is_input_section())
- this->u2_.object->set_section_offset(this->shndx_,
- file_offset - section_file_offset);
- else
- this->u2_.posd->set_address_and_file_offset(address, file_offset);
- }
- // Reset the address and file offset.
- void
- Output_section::Input_section::reset_address_and_file_offset()
- {
- if (!this->is_input_section())
- this->u2_.posd->reset_address_and_file_offset();
- }
- // Finalize the data size.
- void
- Output_section::Input_section::finalize_data_size()
- {
- if (!this->is_input_section())
- this->u2_.posd->finalize_data_size();
- }
- // Try to turn an input offset into an output offset. We want to
- // return the output offset relative to the start of this
- // Input_section in the output section.
- inline bool
- Output_section::Input_section::output_offset(
- const Relobj* object,
- unsigned int shndx,
- section_offset_type offset,
- section_offset_type* poutput) const
- {
- if (!this->is_input_section())
- return this->u2_.posd->output_offset(object, shndx, offset, poutput);
- else
- {
- if (this->shndx_ != shndx || this->u2_.object != object)
- return false;
- *poutput = offset;
- return true;
- }
- }
- // Write out the data. We don't have to do anything for an input
- // section--they are handled via Object::relocate--but this is where
- // we write out the data for an Output_section_data.
- void
- Output_section::Input_section::write(Output_file* of)
- {
- if (!this->is_input_section())
- this->u2_.posd->write(of);
- }
- // Write the data to a buffer. As for write(), we don't have to do
- // anything for an input section.
- void
- Output_section::Input_section::write_to_buffer(unsigned char* buffer)
- {
- if (!this->is_input_section())
- 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;
- case RELAXED_INPUT_SECTION_CODE:
- {
- Output_relaxed_input_section* relaxed_section =
- this->relaxed_input_section();
- mapfile->print_input_section(relaxed_section->relobj(),
- relaxed_section->shndx());
- }
- 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.
- Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
- elfcpp::Elf_Xword flags)
- : name_(name),
- addralign_(0),
- entsize_(0),
- load_address_(0),
- link_section_(NULL),
- link_(0),
- info_section_(NULL),
- info_symndx_(NULL),
- info_(0),
- type_(type),
- flags_(flags),
- order_(ORDER_INVALID),
- out_shndx_(-1U),
- symtab_index_(0),
- dynsym_index_(0),
- input_sections_(),
- first_input_offset_(0),
- fills_(),
- postprocessing_buffer_(NULL),
- needs_symtab_index_(false),
- needs_dynsym_index_(false),
- should_link_to_symtab_(false),
- should_link_to_dynsym_(false),
- after_input_sections_(false),
- requires_postprocessing_(false),
- 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_small_section_(false),
- is_large_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),
- has_fixed_layout_(false),
- is_patch_space_allowed_(false),
- is_unique_segment_(false),
- tls_offset_(0),
- extra_segment_flags_(0),
- segment_alignment_(0),
- checkpoint_(NULL),
- lookup_maps_(new Output_section_lookup_maps),
- free_list_(),
- free_space_fill_(NULL),
- patch_space_(0),
- reloc_section_(NULL)
- {
- // An unallocated section has no address. Forcing this means that
- // we don't need special treatment for symbols defined in debug
- // sections.
- if ((flags & elfcpp::SHF_ALLOC) == 0)
- this->set_address(0);
- }
- Output_section::~Output_section()
- {
- delete this->checkpoint_;
- }
- // Set the entry size.
- void
- Output_section::set_entsize(uint64_t v)
- {
- if (this->is_entsize_zero_)
- ;
- else if (this->entsize_ == 0)
- this->entsize_ = v;
- else if (this->entsize_ != v)
- {
- this->entsize_ = 0;
- this->is_entsize_zero_ = 1;
- }
- }
- // Add the input section SHNDX, with header SHDR, named SECNAME, in
- // OBJECT, to the Output_section. RELOC_SHNDX is the index of a
- // relocation section which applies to this section, or 0 if none, or
- // -1U if more than one. Return the offset of the input section
- // within the output section. Return -1 if the input section will
- // receive special handling. In the normal case we don't always keep
- // track of input sections for an Output_section. Instead, each
- // Object keeps track of the Output_section for each of its input
- // sections. However, if HAVE_SECTIONS_SCRIPT is true, we do keep
- // track of input sections here; this is used when SECTIONS appears in
- // a linker script.
- template<int size, bool big_endian>
- off_t
- Output_section::add_input_section(Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int shndx,
- const char* secname,
- const elfcpp::Shdr<size, big_endian>& shdr,
- unsigned int reloc_shndx,
- bool have_sections_script)
- {
- section_size_type input_section_size = shdr.get_sh_size();
- section_size_type uncompressed_size;
- elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
- if (object->section_is_compressed(shndx, &uncompressed_size,
- &addralign))
- input_section_size = uncompressed_size;
- if ((addralign & (addralign - 1)) != 0)
- {
- object->error(_("invalid alignment %lu for section \"%s\""),
- static_cast<unsigned long>(addralign), secname);
- addralign = 1;
- }
- if (addralign > this->addralign_)
- this->addralign_ = addralign;
- typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags();
- uint64_t entsize = shdr.get_sh_entsize();
- // .debug_str is a mergeable string section, but is not always so
- // marked by compilers. Mark manually here so we can optimize.
- if (strcmp(secname, ".debug_str") == 0)
- {
- sh_flags |= (elfcpp::SHF_MERGE | elfcpp::SHF_STRINGS);
- entsize = 1;
- }
- this->update_flags_for_input_section(sh_flags);
- this->set_entsize(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. We don't try to handle empty merge sections--they
- // mess up the mappings, and are useless anyhow.
- // FIXME: Need to handle merge sections during incremental update.
- if ((sh_flags & elfcpp::SHF_MERGE) != 0
- && reloc_shndx == 0
- && shdr.get_sh_size() > 0
- && !parameters->incremental())
- {
- // Keep information about merged input sections for rebuilding fast
- // lookup maps if we have sections-script or we do relaxation.
- 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))
- {
- // Tell the relocation routines that they need to call the
- // output_offset method to determine the final address.
- return -1;
- }
- }
- off_t offset_in_section;
- if (this->has_fixed_layout())
- {
- // For incremental updates, find a chunk of unused space in the section.
- offset_in_section = this->free_list_.allocate(input_section_size,
- addralign, 0);
- if (offset_in_section == -1)
- gold_fallback(_("out of patch space in section %s; "
- "relink with --incremental-full"),
- this->name());
- return offset_in_section;
- }
- offset_in_section = this->current_data_size_for_child();
- off_t aligned_offset_in_section = align_address(offset_in_section,
- addralign);
- this->set_current_data_size_for_child(aligned_offset_in_section
- + input_section_size);
- // Determine if we want to delay code-fill generation until the output
- // section is written. When the target is relaxing, we want to delay fill
- // generating to avoid adjusting them during relaxation. Also, if we are
- // sorting input sections we must delay fill generation.
- if (!this->generate_code_fills_at_write_
- && !have_sections_script
- && (sh_flags & elfcpp::SHF_EXECINSTR) != 0
- && parameters->target().has_code_fill()
- && (parameters->target().may_relax()
- || layout->is_section_ordering_specified()))
- {
- gold_assert(this->fills_.empty());
- this->generate_code_fills_at_write_ = true;
- }
- if (aligned_offset_in_section > offset_in_section
- && !this->generate_code_fills_at_write_
- && !have_sections_script
- && (sh_flags & elfcpp::SHF_EXECINSTR) != 0
- && parameters->target().has_code_fill())
- {
- // We need to add some fill data. Using fill_list_ when
- // possible is an optimization, since we will often have fill
- // sections without input sections.
- off_t fill_len = aligned_offset_in_section - offset_in_section;
- if (this->input_sections_.empty())
- this->fills_.push_back(Fill(offset_in_section, fill_len));
- else
- {
- std::string fill_data(parameters->target().code_fill(fill_len));
- Output_data_const* odc = new Output_data_const(fill_data, 1);
- this->input_sections_.push_back(Input_section(odc));
- }
- }
- // 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 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()
- || layout->is_section_ordering_specified())
- {
- Input_section isecn(object, shndx, input_section_size, addralign);
- /* If section ordering is requested by specifying a ordering file,
- using --section-ordering-file, match the section name with
- a pattern. */
- 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 arbitrary data to an output section.
- void
- Output_section::add_output_section_data(Output_section_data* posd)
- {
- Input_section inp(posd);
- this->add_output_section_data(&inp);
- if (posd->is_data_size_valid())
- {
- off_t offset_in_section;
- if (this->has_fixed_layout())
- {
- // For incremental updates, find a chunk of unused space.
- offset_in_section = this->free_list_.allocate(posd->data_size(),
- posd->addralign(), 0);
- if (offset_in_section == -1)
- gold_fallback(_("out of patch space in section %s; "
- "relink with --incremental-full"),
- this->name());
- // Finalize the address and offset now.
- uint64_t addr = this->address();
- off_t offset = this->offset();
- posd->set_address_and_file_offset(addr + offset_in_section,
- offset + offset_in_section);
- }
- else
- {
- offset_in_section = this->current_data_size_for_child();
- off_t aligned_offset_in_section = align_address(offset_in_section,
- posd->addralign());
- this->set_current_data_size_for_child(aligned_offset_in_section
- + posd->data_size());
- }
- }
- else if (this->has_fixed_layout())
- {
- // For incremental updates, arrange for the data to have a fixed layout.
- // This will mean that additions to the data must be allocated from
- // free space within the containing output section.
- uint64_t addr = this->address();
- posd->set_address(addr);
- posd->set_file_offset(0);
- // FIXME: This should eventually be unreachable.
- // gold_unreachable();
- }
- }
- // Add a relaxed input section.
- void
- 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 (layout->is_section_ordering_specified())
- {
- 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(),
- poris->shndx(), poris);
- // For a relaxed section, we use the current data size. Linker scripts
- // get all the input sections, including relaxed one from an output
- // section and add them back to the same output section to compute the
- // output section size. If we do not account for sizes of relaxed input
- // sections, an output section would be incorrectly sized.
- off_t offset_in_section = this->current_data_size_for_child();
- off_t aligned_offset_in_section = align_address(offset_in_section,
- poris->addralign());
- this->set_current_data_size_for_child(aligned_offset_in_section
- + poris->current_data_size());
- }
- // Add arbitrary data to an output section by Input_section.
- void
- Output_section::add_output_section_data(Input_section* inp)
- {
- if (this->input_sections_.empty())
- this->first_input_offset_ = this->current_data_size_for_child();
- this->input_sections_.push_back(*inp);
- uint64_t addralign = inp->addralign();
- if (addralign > this->addralign_)
- this->addralign_ = addralign;
- inp->set_output_section(this);
- }
- // Add a merge section to an output section.
- void
- Output_section::add_output_merge_section(Output_section_data* posd,
- bool is_string, uint64_t entsize)
- {
- Input_section inp(posd, is_string, entsize);
- this->add_output_section_data(&inp);
- }
- // Add an input section to a SHF_MERGE section.
- bool
- Output_section::add_merge_input_section(Relobj* object, unsigned int shndx,
- uint64_t flags, uint64_t entsize,
- uint64_t addralign,
- bool keeps_input_sections)
- {
- // We cannot merge sections with entsize == 0.
- if (entsize == 0)
- return false;
- bool is_string = (flags & elfcpp::SHF_STRINGS) != 0;
- // We cannot restore merged input section states.
- gold_assert(this->checkpoint_ == NULL);
- // Look up merge sections by required properties.
- // Currently, we only invalidate the lookup maps in script processing
- // and relaxation. We should not have done either when we reach here.
- // So we assume that the lookup maps are valid to simply code.
- gold_assert(this->lookup_maps_->is_valid());
- Merge_section_properties msp(is_string, entsize, addralign);
- Output_merge_base* pomb = this->lookup_maps_->find_merge_section(msp);
- bool is_new = false;
- if (pomb != NULL)
- {
- gold_assert(pomb->is_string() == is_string
- && pomb->entsize() == entsize
- && pomb->addralign() == addralign);
- }
- else
- {
- // Create a new Output_merge_data or Output_merge_string_data.
- if (!is_string)
- pomb = new Output_merge_data(entsize, addralign);
- else
- {
- switch (entsize)
- {
- case 1:
- pomb = new Output_merge_string<char>(addralign);
- break;
- case 2:
- pomb = new Output_merge_string<uint16_t>(addralign);
- break;
- case 4:
- pomb = new Output_merge_string<uint32_t>(addralign);
- break;
- default:
- return false;
- }
- }
- // If we need to do script processing or relaxation, we need to keep
- // the original input sections to rebuild the fast lookup maps.
- if (keeps_input_sections)
- pomb->set_keeps_input_sections();
- is_new = true;
- }
- if (pomb->add_input_section(object, shndx))
- {
- // Add new merge section to this output section and link merge
- // section properties to new merge section in map.
- if (is_new)
- {
- this->add_output_merge_section(pomb, is_string, entsize);
- this->lookup_maps_->add_merge_section(msp, pomb);
- }
- return true;
- }
- else
- {
- // If add_input_section failed, delete new merge section to avoid
- // exporting empty merge sections in Output_section::get_input_section.
- if (is_new)
- delete pomb;
- return false;
- }
- }
- // Build a relaxation map to speed up relaxation of existing input sections.
- // Look up to the first LIMIT elements in INPUT_SECTIONS.
- void
- Output_section::build_relaxation_map(
- const Input_section_list& input_sections,
- size_t limit,
- Relaxation_map* relaxation_map) const
- {
- for (size_t i = 0; i < limit; ++i)
- {
- const Input_section& is(input_sections[i]);
- if (is.is_input_section() || is.is_relaxed_input_section())
- {
- Section_id sid(is.relobj(), is.shndx());
- (*relaxation_map)[sid] = i;
- }
- }
- }
- // Convert regular input sections in INPUT_SECTIONS into relaxed input
- // sections in RELAXED_SECTIONS. MAP is a prebuilt map from section id
- // indices of INPUT_SECTIONS.
- void
- Output_section::convert_input_sections_in_list_to_relaxed_sections(
- const std::vector<Output_relaxed_input_section*>& relaxed_sections,
- const Relaxation_map& map,
- Input_section_list* input_sections)
- {
- for (size_t i = 0; i < relaxed_sections.size(); ++i)
- {
- Output_relaxed_input_section* poris = relaxed_sections[i];
- Section_id sid(poris->relobj(), poris->shndx());
- 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);
- }
- }
- // Convert regular input sections into relaxed input sections. RELAXED_SECTIONS
- // is a vector of pointers to Output_relaxed_input_section or its derived
- // classes. The relaxed sections must correspond to existing input sections.
- void
- Output_section::convert_input_sections_to_relaxed_sections(
- const std::vector<Output_relaxed_input_section*>& relaxed_sections)
- {
- gold_assert(parameters->target().may_relax());
- // We want to make sure that restore_states does not undo the effect of
- // this. If there is no checkpoint active, just search the current
- // input section list and replace the sections there. If there is
- // a checkpoint, also replace the sections there.
- // By default, we look at the whole list.
- size_t limit = this->input_sections_.size();
- if (this->checkpoint_ != NULL)
- {
- // Replace input sections with relaxed input section in the saved
- // copy of the input section list.
- if (this->checkpoint_->input_sections_saved())
- {
- Relaxation_map map;
- this->build_relaxation_map(
- *(this->checkpoint_->input_sections()),
- this->checkpoint_->input_sections()->size(),
- &map);
- this->convert_input_sections_in_list_to_relaxed_sections(
- relaxed_sections,
- map,
- this->checkpoint_->input_sections());
- }
- else
- {
- // We have not copied the input section list yet. Instead, just
- // look at the portion that would be saved.
- limit = this->checkpoint_->input_sections_size();
- }
- }
- // Convert input sections in input_section_list.
- Relaxation_map map;
- this->build_relaxation_map(this->input_sections_, limit, &map);
- this->convert_input_sections_in_list_to_relaxed_sections(
- relaxed_sections,
- map,
- &this->input_sections_);
- // Update fast look-up map.
- if (this->lookup_maps_->is_valid())
- for (size_t i = 0; i < relaxed_sections.size(); ++i)
- {
- Output_relaxed_input_section* poris = relaxed_sections[i];
- this->lookup_maps_->add_relaxed_input_section(poris->relobj(),
- poris->shndx(), poris);
- }
- }
- // Update the output section flags based on input section flags.
- void
- Output_section::update_flags_for_input_section(elfcpp::Elf_Xword flags)
- {
- // If we created the section with SHF_ALLOC clear, we set the
- // address. If we are now setting the SHF_ALLOC flag, we need to
- // undo that.
- if ((this->flags_ & elfcpp::SHF_ALLOC) == 0
- && (flags & elfcpp::SHF_ALLOC) != 0)
- this->mark_address_invalid();
- this->flags_ |= (flags
- & (elfcpp::SHF_WRITE
- | elfcpp::SHF_ALLOC
- | elfcpp::SHF_EXECINSTR));
- if ((flags & elfcpp::SHF_MERGE) == 0)
- this->flags_ &=~ elfcpp::SHF_MERGE;
- else
- {
- if (this->current_data_size_for_child() == 0)
- this->flags_ |= elfcpp::SHF_MERGE;
- }
- if ((flags & elfcpp::SHF_STRINGS) == 0)
- this->flags_ &=~ elfcpp::SHF_STRINGS;
- else
- {
- if (this->current_data_size_for_child() == 0)
- this->flags_ |= elfcpp::SHF_STRINGS;
- }
- }
- // Find the merge section into which an input section with index SHNDX in
- // OBJECT has been added. Return NULL if none found.
- const Output_section_data*
- Output_section::find_merge_section(const Relobj* object,
- unsigned int shndx) const
- {
- return object->find_merge_section(shndx);
- }
- // Build the lookup maps for relaxed sections. This needs
- // to be declared as a const method so that it is callable with a const
- // Output_section pointer. The method only updates states of the maps.
- void
- Output_section::build_lookup_maps() const
- {
- this->lookup_maps_->clear();
- for (Input_section_list::const_iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- if (p->is_relaxed_input_section())
- {
- Output_relaxed_input_section* poris = p->relaxed_input_section();
- this->lookup_maps_->add_relaxed_input_section(poris->relobj(),
- poris->shndx(), poris);
- }
- }
- }
- // Find an relaxed input section corresponding to an input section
- // in OBJECT with index SHNDX.
- const Output_relaxed_input_section*
- Output_section::find_relaxed_input_section(const Relobj* object,
- unsigned int shndx) const
- {
- if (!this->lookup_maps_->is_valid())
- this->build_lookup_maps();
- return this->lookup_maps_->find_relaxed_input_section(object, shndx);
- }
- // Given an address OFFSET relative to the start of input section
- // SHNDX in OBJECT, return whether this address is being included in
- // the final link. This should only be called if SHNDX in OBJECT has
- // a special mapping.
- bool
- Output_section::is_input_address_mapped(const Relobj* object,
- unsigned int shndx,
- off_t offset) const
- {
- // Look at the Output_section_data_maps first.
- const Output_section_data* posd = this->find_merge_section(object, shndx);
- if (posd == NULL)
- posd = this->find_relaxed_input_section(object, shndx);
- if (posd != NULL)
- {
- section_offset_type output_offset;
- bool found = posd->output_offset(object, shndx, offset, &output_offset);
- // By default we assume that the address is mapped. See comment at the
- // end.
- if (!found)
- return true;
- return output_offset != -1;
- }
- // Fall back to the slow look-up.
- for (Input_section_list::const_iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- section_offset_type output_offset;
- if (p->output_offset(object, shndx, offset, &output_offset))
- return output_offset != -1;
- }
- // By default we assume that the address is mapped. This should
- // only be called after we have passed all sections to Layout. At
- // that point we should know what we are discarding.
- return true;
- }
- // Given an address OFFSET relative to the start of input section
- // SHNDX in object OBJECT, return the output offset relative to the
- // start of the input section in the output section. This should only
- // be called if SHNDX in OBJECT has a special mapping.
- section_offset_type
- Output_section::output_offset(const Relobj* object, unsigned int shndx,
- section_offset_type offset) const
- {
- // This can only be called meaningfully when we know the data size
- // of this.
- gold_assert(this->is_data_size_valid());
- // Look at the Output_section_data_maps first.
- const Output_section_data* posd = this->find_merge_section(object, shndx);
- if (posd == NULL)
- posd = this->find_relaxed_input_section(object, shndx);
- if (posd != NULL)
- {
- section_offset_type output_offset;
- bool found = posd->output_offset(object, shndx, offset, &output_offset);
- gold_assert(found);
- return output_offset;
- }
- // Fall back to the slow look-up.
- for (Input_section_list::const_iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- section_offset_type output_offset;
- if (p->output_offset(object, shndx, offset, &output_offset))
- return output_offset;
- }
- gold_unreachable();
- }
- // Return the output virtual address of OFFSET relative to the start
- // of input section SHNDX in object OBJECT.
- uint64_t
- Output_section::output_address(const Relobj* object, unsigned int shndx,
- off_t offset) const
- {
- uint64_t addr = this->address() + this->first_input_offset_;
- // Look at the Output_section_data_maps first.
- const Output_section_data* posd = this->find_merge_section(object, shndx);
- if (posd == NULL)
- posd = this->find_relaxed_input_section(object, shndx);
- if (posd != NULL && posd->is_address_valid())
- {
- section_offset_type output_offset;
- bool found = posd->output_offset(object, shndx, offset, &output_offset);
- gold_assert(found);
- return posd->address() + output_offset;
- }
- // Fall back to the slow look-up.
- for (Input_section_list::const_iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- addr = align_address(addr, p->addralign());
- section_offset_type output_offset;
- if (p->output_offset(object, shndx, offset, &output_offset))
- {
- if (output_offset == -1)
- return -1ULL;
- return addr + output_offset;
- }
- addr += p->data_size();
- }
- // If we get here, it means that we don't know the mapping for this
- // input section. This might happen in principle if
- // add_input_section were called before add_output_section_data.
- // But it should never actually happen.
- gold_unreachable();
- }
- // Find the output address of the start of the merged section for
- // input section SHNDX in object OBJECT.
- bool
- Output_section::find_starting_output_address(const Relobj* object,
- unsigned int shndx,
- uint64_t* paddr) const
- {
- const Output_section_data* data = this->find_merge_section(object, shndx);
- if (data == NULL)
- return false;
- // FIXME: This becomes a bottle-neck if we have many relaxed sections.
- // Looking up the merge section map does not always work as we sometimes
- // find a merge section without its address set.
- 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();
- ++p)
- {
- addr = align_address(addr, p->addralign());
- // It would be nice if we could use the existing output_offset
- // method to get the output offset of input offset 0.
- // Unfortunately we don't know for sure that input offset 0 is
- // mapped at all.
- if (!p->is_input_section() && p->output_section_data() == data)
- {
- *paddr = addr;
- return true;
- }
- addr += p->data_size();
- }
- // We couldn't find a merge output section for this input section.
- return false;
- }
- // Update the data size of an Output_section.
- void
- Output_section::update_data_size()
- {
- if (this->input_sections_.empty())
- return;
- if (this->must_sort_attached_input_sections()
- || this->input_section_order_specified())
- this->sort_attached_input_sections();
- off_t off = this->first_input_offset_;
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- off = align_address(off, p->addralign());
- off += p->current_data_size();
- }
- this->set_current_data_size_for_child(off);
- }
- // Set the data size of an Output_section. This is where we handle
- // setting the addresses of any Output_section_data objects.
- void
- Output_section::set_final_data_size()
- {
- off_t data_size;
- if (this->input_sections_.empty())
- data_size = this->current_data_size_for_child();
- else
- {
- if (this->must_sort_attached_input_sections()
- || this->input_section_order_specified())
- this->sort_attached_input_sections();
- uint64_t address = this->address();
- off_t startoff = this->offset();
- off_t off = this->first_input_offset_;
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- off = align_address(off, p->addralign());
- p->set_address_and_file_offset(address + off, startoff + off,
- startoff);
- off += p->data_size();
- }
- data_size = off;
- }
- // For full incremental links, we want to allocate some patch space
- // in most sections for subsequent incremental updates.
- if (this->is_patch_space_allowed_ && parameters->incremental_full())
- {
- double pct = parameters->options().incremental_patch();
- size_t extra = static_cast<size_t>(data_size * pct);
- if (this->free_space_fill_ != NULL
- && this->free_space_fill_->minimum_hole_size() > extra)
- extra = this->free_space_fill_->minimum_hole_size();
- off_t new_size = align_address(data_size + extra, this->addralign());
- this->patch_space_ = new_size - data_size;
- gold_debug(DEBUG_INCREMENTAL,
- "set_final_data_size: %08lx + %08lx: section %s",
- static_cast<long>(data_size),
- static_cast<long>(this->patch_space_),
- this->name());
- data_size = new_size;
- }
- this->set_data_size(data_size);
- }
- // Reset the address and file offset.
- void
- Output_section::do_reset_address_and_file_offset()
- {
- // An unallocated section has no address. Forcing this means that
- // we don't need special treatment for symbols defined in debug
- // sections. We do the same in the constructor. This does not
- // apply to NOLOAD sections though.
- if (((this->flags_ & elfcpp::SHF_ALLOC) == 0) && !this->is_noload_)
- this->set_address(0);
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- p->reset_address_and_file_offset();
- // Remove any patch space that was added in set_final_data_size.
- if (this->patch_space_ > 0)
- {
- this->set_current_data_size_for_child(this->current_data_size_for_child()
- - this->patch_space_);
- this->patch_space_ = 0;
- }
- }
- // Return true if address and file offset have the values after reset.
- bool
- Output_section::do_address_and_file_offset_have_reset_values() const
- {
- if (this->is_offset_valid())
- return false;
- // An unallocated section has address 0 after its construction or a reset.
- if ((this->flags_ & elfcpp::SHF_ALLOC) == 0)
- return this->is_address_valid() && this->address() == 0;
- else
- return !this->is_address_valid();
- }
- // Set the TLS offset. Called only for SHT_TLS sections.
- void
- Output_section::do_set_tls_offset(uint64_t tls_base)
- {
- this->tls_offset_ = this->address() - tls_base;
- }
- // In a few cases we need to sort the input sections attached to an
- // output section. This is used to implement the type of constructor
- // priority ordering implemented by the GNU linker, in which the
- // priority becomes part of the section name and the sections are
- // sorted by name. We only do this for an output section if we see an
- // attached input section matching ".ctors.*", ".dtors.*",
- // ".init_array.*" or ".fini_array.*".
- class Output_section::Input_section_sort_entry
- {
- public:
- Input_section_sort_entry()
- : input_section_(), index_(-1U), section_name_()
- { }
- Input_section_sort_entry(const Input_section& input_section,
- unsigned int index,
- bool must_sort_attached_input_sections,
- const char* output_section_name)
- : input_section_(input_section), index_(index), section_name_()
- {
- if ((input_section.is_input_section()
- || input_section.is_relaxed_input_section())
- && 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
- // in a Task token.
- const Task* dummy_task = reinterpret_cast<const Task*>(-1);
- Object* obj = (input_section.is_input_section()
- ? input_section.relobj()
- : input_section.relaxed_input_section()->relobj());
- Task_lock_obj<Object> tl(dummy_task, obj);
- // This is a slow operation, which should be cached in
- // Layout::layout if this becomes a speed problem.
- this->section_name_ = obj->section_name(input_section.shndx());
- }
- else if (input_section.is_output_section_data()
- && must_sort_attached_input_sections)
- {
- // For linker-generated sections, use the output section name.
- this->section_name_.assign(output_section_name);
- }
- }
- // Return the Input_section.
- const Input_section&
- input_section() const
- {
- gold_assert(this->index_ != -1U);
- return this->input_section_;
- }
- // The index of this entry in the original list. This is used to
- // make the sort stable.
- unsigned int
- index() const
- {
- gold_assert(this->index_ != -1U);
- return this->index_;
- }
- // The section name.
- const std::string&
- section_name() const
- {
- return this->section_name_;
- }
- // Return true if the section name has a priority. This is assumed
- // to be true if it has a dot after the initial dot.
- bool
- has_priority() const
- {
- return this->section_name_.find('.', 1) != std::string::npos;
- }
- // Return the priority. Believe it or not, gcc encodes the priority
- // differently for .ctors/.dtors and .init_array/.fini_array
- // sections.
- unsigned int
- get_priority() const
- {
- bool is_ctors;
- if (is_prefix_of(".ctors.", this->section_name_.c_str())
- || is_prefix_of(".dtors.", this->section_name_.c_str()))
- is_ctors = true;
- else if (is_prefix_of(".init_array.", this->section_name_.c_str())
- || is_prefix_of(".fini_array.", this->section_name_.c_str()))
- is_ctors = false;
- else
- return 0;
- char* end;
- unsigned long prio = strtoul((this->section_name_.c_str()
- + (is_ctors ? 7 : 12)),
- &end, 10);
- if (*end != '\0')
- return 0;
- else if (is_ctors)
- return 65535 - prio;
- else
- return prio;
- }
- // Return true if this an input file whose base name matches
- // FILE_NAME. The base name must have an extension of ".o", and
- // must be exactly FILE_NAME.o or FILE_NAME, one character, ".o".
- // This is to match crtbegin.o as well as crtbeginS.o without
- // getting confused by other possibilities. Overall matching the
- // file name this way is a dreadful hack, but the GNU linker does it
- // in order to better support gcc, and we need to be compatible.
- bool
- match_file_name(const char* file_name) const
- {
- if (this->input_section_.is_output_section_data())
- return false;
- return Layout::match_file_name(this->input_section_.relobj(), file_name);
- }
- // 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_;
- // The index of this Input_section in the original list.
- unsigned int index_;
- // The section name if there is one.
- std::string section_name_;
- };
- // Return true if S1 should come before S2 in the output section.
- bool
- Output_section::Input_section_sort_compare::operator()(
- const Output_section::Input_section_sort_entry& s1,
- const Output_section::Input_section_sort_entry& s2) const
- {
- // crtbegin.o must come first.
- bool s1_begin = s1.match_file_name("crtbegin");
- bool s2_begin = s2.match_file_name("crtbegin");
- if (s1_begin || s2_begin)
- {
- if (!s1_begin)
- return false;
- if (!s2_begin)
- return true;
- return s1.index() < s2.index();
- }
- // crtend.o must come last.
- bool s1_end = s1.match_file_name("crtend");
- bool s2_end = s2.match_file_name("crtend");
- if (s1_end || s2_end)
- {
- if (!s1_end)
- return true;
- if (!s2_end)
- return false;
- return s1.index() < s2.index();
- }
- // A section with a priority follows a section without a priority.
- bool s1_has_priority = s1.has_priority();
- bool s2_has_priority = s2.has_priority();
- if (s1_has_priority && !s2_has_priority)
- return false;
- 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)
- return compare < 0;
- // Otherwise we keep the input order.
- return s1.index() < s2.index();
- }
- // Return true if S1 should come before S2 in an .init_array or .fini_array
- // output section.
- bool
- Output_section::Input_section_sort_init_fini_compare::operator()(
- const Output_section::Input_section_sort_entry& s1,
- const Output_section::Input_section_sort_entry& s2) const
- {
- // A section without a priority follows a section with a priority.
- // This is the reverse of .ctors and .dtors sections.
- bool s1_has_priority = s1.has_priority();
- bool s2_has_priority = s2.has_priority();
- if (s1_has_priority && !s2_has_priority)
- return true;
- if (!s1_has_priority && s2_has_priority)
- return false;
- // .ctors and .dtors sections without priority come after
- // .init_array and .fini_array sections without priority.
- if (!s1_has_priority
- && (s1.section_name() == ".ctors" || s1.section_name() == ".dtors")
- && s1.section_name() != s2.section_name())
- return false;
- if (!s2_has_priority
- && (s2.section_name() == ".ctors" || s2.section_name() == ".dtors")
- && s2.section_name() != s1.section_name())
- return true;
- // Sort by priority if we can.
- if (s1_has_priority)
- {
- unsigned int s1_prio = s1.get_priority();
- unsigned int s2_prio = s2.get_priority();
- if (s1_prio < s2_prio)
- return true;
- else if (s1_prio > s2_prio)
- 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 compare < 0;
- // Otherwise we keep the input order.
- 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;
- }
- // Return true if S1 should come before S2. This is the sort comparison
- // function for .text to sort sections with prefixes
- // .text.{unlikely,exit,startup,hot} before other sections.
- bool
- Output_section::Input_section_sort_section_prefix_special_ordering_compare
- ::operator()(
- const Output_section::Input_section_sort_entry& s1,
- const Output_section::Input_section_sort_entry& s2) const
- {
- // Some input section names have special ordering requirements.
- const char *s1_section_name = s1.section_name().c_str();
- const char *s2_section_name = s2.section_name().c_str();
- int o1 = Layout::special_ordering_of_input_section(s1_section_name);
- int o2 = Layout::special_ordering_of_input_section(s2_section_name);
- if (o1 != o2)
- {
- if (o1 < 0)
- return false;
- else if (o2 < 0)
- return true;
- else
- return o1 < o2;
- }
- else if (is_prefix_of(".text.sorted", s1_section_name))
- return strcmp(s1_section_name, s2_section_name) <= 0;
- // Keep input order otherwise.
- return s1.index() < s2.index();
- }
- // Return true if S1 should come before S2. This is the sort comparison
- // function for sections to sort them by name.
- bool
- Output_section::Input_section_sort_section_name_compare
- ::operator()(
- const Output_section::Input_section_sort_entry& s1,
- const Output_section::Input_section_sort_entry& s2) const
- {
- // We sort by name.
- int compare = s1.section_name().compare(s2.section_name());
- if (compare != 0)
- return compare < 0;
- // Keep input order otherwise.
- return s1.index() < s2.index();
- }
- // This updates the section order index of input sections according to the
- // the order specified in the mapping from Section id to order index.
- void
- Output_section::update_section_layout(
- const Section_layout_order* order_map)
- {
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- if (p->is_input_section()
- || p->is_relaxed_input_section())
- {
- Relobj* obj = (p->is_input_section()
- ? p->relobj()
- : p->relaxed_input_section()->relobj());
- unsigned int shndx = p->shndx();
- Section_layout_order::const_iterator it
- = order_map->find(Section_id(obj, shndx));
- if (it == order_map->end())
- continue;
- unsigned int section_order_index = it->second;
- if (section_order_index != 0)
- {
- p->set_section_order_index(section_order_index);
- this->set_input_section_order_specified();
- }
- }
- }
- }
- // Sort the input sections attached to an output section.
- void
- Output_section::sort_attached_input_sections()
- {
- if (this->attached_input_sections_are_sorted_)
- return;
- if (this->checkpoint_ != NULL
- && !this->checkpoint_->input_sections_saved())
- this->checkpoint_->save_input_sections();
- // The only thing we know about an input section is the object and
- // the section index. We need the section name. Recomputing this
- // is slow but this is an unusual case. If this becomes a speed
- // problem we can cache the names as required in Layout::layout.
- // We start by building a larger vector holding a copy of each
- // Input_section, plus its current index in the list and its name.
- std::vector<Input_section_sort_entry> sort_list;
- unsigned int i = 0;
- 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,
- this->must_sort_attached_input_sections(),
- this->name()));
- // Sort the input sections.
- 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 if (strcmp(parameters->options().sort_section(), "name") == 0)
- std::sort(sort_list.begin(), sort_list.end(),
- Input_section_sort_section_name_compare());
- else if (strcmp(this->name(), ".text") == 0)
- std::sort(sort_list.begin(), sort_list.end(),
- Input_section_sort_section_prefix_special_ordering_compare());
- else
- std::sort(sort_list.begin(), sort_list.end(),
- Input_section_sort_compare());
- }
- else
- {
- gold_assert(this->input_section_order_specified());
- 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();
- for (std::vector<Input_section_sort_entry>::iterator p = sort_list.begin();
- 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.
- this->attached_input_sections_are_sorted_ = true;
- }
- // Write the section header to *OSHDR.
- template<int size, bool big_endian>
- void
- Output_section::write_header(const Layout* layout,
- const Stringpool* secnamepool,
- elfcpp::Shdr_write<size, big_endian>* oshdr) const
- {
- oshdr->put_sh_name(secnamepool->get_offset(this->name_));
- oshdr->put_sh_type(this->type_);
- elfcpp::Elf_Xword flags = this->flags_;
- if (this->info_section_ != NULL && this->info_uses_section_index_)
- flags |= elfcpp::SHF_INFO_LINK;
- oshdr->put_sh_flags(flags);
- oshdr->put_sh_addr(this->address());
- oshdr->put_sh_offset(this->offset());
- oshdr->put_sh_size(this->data_size());
- if (this->link_section_ != NULL)
- oshdr->put_sh_link(this->link_section_->out_shndx());
- else if (this->should_link_to_symtab_)
- oshdr->put_sh_link(layout->symtab_section_shndx());
- else if (this->should_link_to_dynsym_)
- oshdr->put_sh_link(layout->dynsym_section()->out_shndx());
- else
- oshdr->put_sh_link(this->link_);
- elfcpp::Elf_Word info;
- if (this->info_section_ != NULL)
- {
- if (this->info_uses_section_index_)
- info = this->info_section_->out_shndx();
- else
- info = this->info_section_->symtab_index();
- }
- else if (this->info_symndx_ != NULL)
- info = this->info_symndx_->symtab_index();
- else
- info = this->info_;
- oshdr->put_sh_info(info);
- oshdr->put_sh_addralign(this->addralign_);
- oshdr->put_sh_entsize(this->entsize_);
- }
- // Write out the data. For input sections the data is written out by
- // Object::relocate, but we have to handle Output_section_data objects
- // here.
- void
- Output_section::do_write(Output_file* of)
- {
- gold_assert(!this->requires_postprocessing());
- // If the target performs relaxation, we delay filler generation until now.
- gold_assert(!this->generate_code_fills_at_write_ || this->fills_.empty());
- off_t output_section_file_offset = this->offset();
- for (Fill_list::iterator p = this->fills_.begin();
- p != this->fills_.end();
- ++p)
- {
- std::string fill_data(parameters->target().code_fill(p->length()));
- of->write(output_section_file_offset + p->section_offset(),
- fill_data.data(), fill_data.size());
- }
- off_t off = this->offset() + this->first_input_offset_;
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- off_t aligned_off = align_address(off, p->addralign());
- if (this->generate_code_fills_at_write_ && (off != aligned_off))
- {
- size_t fill_len = aligned_off - off;
- std::string fill_data(parameters->target().code_fill(fill_len));
- of->write(off, fill_data.data(), fill_data.size());
- }
- p->write(of);
- off = aligned_off + p->data_size();
- }
- // For incremental links, fill in unused chunks in debug sections
- // with dummy compilation unit headers.
- if (this->free_space_fill_ != NULL)
- {
- for (Free_list::Const_iterator p = this->free_list_.begin();
- p != this->free_list_.end();
- ++p)
- {
- off_t off = p->start_;
- size_t len = p->end_ - off;
- this->free_space_fill_->write(of, this->offset() + off, len);
- }
- if (this->patch_space_ > 0)
- {
- off_t off = this->current_data_size_for_child() - this->patch_space_;
- this->free_space_fill_->write(of, this->offset() + off,
- this->patch_space_);
- }
- }
- }
- // If a section requires postprocessing, create the buffer to use.
- void
- Output_section::create_postprocessing_buffer()
- {
- gold_assert(this->requires_postprocessing());
- if (this->postprocessing_buffer_ != NULL)
- return;
- if (!this->input_sections_.empty())
- {
- off_t off = this->first_input_offset_;
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- off = align_address(off, p->addralign());
- p->finalize_data_size();
- off += p->data_size();
- }
- this->set_current_data_size_for_child(off);
- }
- off_t buffer_size = this->current_data_size_for_child();
- this->postprocessing_buffer_ = new unsigned char[buffer_size];
- }
- // Write all the data of an Output_section into the postprocessing
- // buffer. This is used for sections which require postprocessing,
- // such as compression. Input sections are handled by
- // Object::Relocate.
- void
- Output_section::write_to_postprocessing_buffer()
- {
- gold_assert(this->requires_postprocessing());
- // If the target performs relaxation, we delay filler generation until now.
- gold_assert(!this->generate_code_fills_at_write_ || this->fills_.empty());
- unsigned char* buffer = this->postprocessing_buffer();
- for (Fill_list::iterator p = this->fills_.begin();
- p != this->fills_.end();
- ++p)
- {
- std::string fill_data(parameters->target().code_fill(p->length()));
- memcpy(buffer + p->section_offset(), fill_data.data(),
- fill_data.size());
- }
- off_t off = this->first_input_offset_;
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- off_t aligned_off = align_address(off, p->addralign());
- if (this->generate_code_fills_at_write_ && (off != aligned_off))
- {
- size_t fill_len = aligned_off - off;
- std::string fill_data(parameters->target().code_fill(fill_len));
- memcpy(buffer + off, fill_data.data(), fill_data.size());
- }
- p->write_to_buffer(buffer + aligned_off);
- off = aligned_off + p->data_size();
- }
- }
- // Get the input sections for linker script processing. We leave
- // behind the Output_section_data entries. Note that this may be
- // slightly incorrect for merge sections. We will leave them behind,
- // but it is possible that the script says that they should follow
- // some other input sections, as in:
- // .rodata { *(.rodata) *(.rodata.cst*) }
- // For that matter, we don't handle this correctly:
- // .rodata { foo.o(.rodata.cst*) *(.rodata.cst*) }
- // With luck this will never matter.
- uint64_t
- Output_section::get_input_sections(
- uint64_t address,
- const std::string& fill,
- std::list<Input_section>* input_sections)
- {
- if (this->checkpoint_ != NULL
- && !this->checkpoint_->input_sections_saved())
- this->checkpoint_->save_input_sections();
- // Invalidate fast look-up maps.
- this->lookup_maps_->invalidate();
- uint64_t orig_address = address;
- address = align_address(address, this->addralign());
- Input_section_list remaining;
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- if (p->is_input_section()
- || p->is_relaxed_input_section()
- || p->is_merge_section())
- input_sections->push_back(*p);
- else
- {
- uint64_t aligned_address = align_address(address, p->addralign());
- if (aligned_address != address && !fill.empty())
- {
- section_size_type length =
- convert_to_section_size_type(aligned_address - address);
- std::string this_fill;
- this_fill.reserve(length);
- while (this_fill.length() + fill.length() <= length)
- this_fill += fill;
- if (this_fill.length() < length)
- this_fill.append(fill, 0, length - this_fill.length());
- Output_section_data* posd = new Output_data_const(this_fill, 0);
- remaining.push_back(Input_section(posd));
- }
- address = aligned_address;
- remaining.push_back(*p);
- p->finalize_data_size();
- address += p->data_size();
- }
- }
- this->input_sections_.swap(remaining);
- this->first_input_offset_ = 0;
- uint64_t data_size = address - orig_address;
- this->set_current_data_size_for_child(data_size);
- return data_size;
- }
- // Add a script input section. SIS is an Output_section::Input_section,
- // which can be either a plain input section or a special input section like
- // a relaxed input section. For a special input section, its size must be
- // finalized.
- void
- Output_section::add_script_input_section(const Input_section& sis)
- {
- uint64_t data_size = sis.data_size();
- uint64_t addralign = sis.addralign();
- if (addralign > this->addralign_)
- this->addralign_ = addralign;
- off_t offset_in_section = this->current_data_size_for_child();
- off_t aligned_offset_in_section = align_address(offset_in_section,
- addralign);
- this->set_current_data_size_for_child(aligned_offset_in_section
- + data_size);
- this->input_sections_.push_back(sis);
- // Update fast lookup maps if necessary.
- if (this->lookup_maps_->is_valid())
- {
- if (sis.is_relaxed_input_section())
- {
- Output_relaxed_input_section* poris = sis.relaxed_input_section();
- this->lookup_maps_->add_relaxed_input_section(poris->relobj(),
- poris->shndx(), poris);
- }
- }
- }
- // Save states for relaxation.
- void
- Output_section::save_states()
- {
- gold_assert(this->checkpoint_ == NULL);
- Checkpoint_output_section* checkpoint =
- new Checkpoint_output_section(this->addralign_, this->flags_,
- this->input_sections_,
- this->first_input_offset_,
- this->attached_input_sections_are_sorted_);
- this->checkpoint_ = checkpoint;
- gold_assert(this->fills_.empty());
- }
- void
- Output_section::discard_states()
- {
- gold_assert(this->checkpoint_ != NULL);
- delete this->checkpoint_;
- this->checkpoint_ = NULL;
- gold_assert(this->fills_.empty());
- // Simply invalidate the fast lookup maps since we do not keep
- // track of them.
- this->lookup_maps_->invalidate();
- }
- void
- Output_section::restore_states()
- {
- gold_assert(this->checkpoint_ != NULL);
- Checkpoint_output_section* checkpoint = this->checkpoint_;
- this->addralign_ = checkpoint->addralign();
- this->flags_ = checkpoint->flags();
- this->first_input_offset_ = checkpoint->first_input_offset();
- if (!checkpoint->input_sections_saved())
- {
- // If we have not copied the input sections, just resize it.
- size_t old_size = checkpoint->input_sections_size();
- gold_assert(this->input_sections_.size() >= old_size);
- this->input_sections_.resize(old_size);
- }
- else
- {
- // We need to copy the whole list. This is not efficient for
- // extremely large output with hundreads of thousands of input
- // objects. We may need to re-think how we should pass sections
- // to scripts.
- this->input_sections_ = *checkpoint->input_sections();
- }
- this->attached_input_sections_are_sorted_ =
- checkpoint->attached_input_sections_are_sorted();
- // Simply invalidate the fast lookup maps since we do not keep
- // track of them.
- this->lookup_maps_->invalidate();
- }
- // Update the section offsets of input sections in this. This is required if
- // relaxation causes some input sections to change sizes.
- void
- Output_section::adjust_section_offsets()
- {
- if (!this->section_offsets_need_adjustment_)
- return;
- off_t off = 0;
- for (Input_section_list::iterator p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- {
- off = align_address(off, p->addralign());
- if (p->is_input_section())
- p->relobj()->set_section_offset(p->shndx(), off);
- off += p->data_size();
- }
- this->section_offsets_need_adjustment_ = false;
- }
- // 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
- Output_section::print_merge_stats()
- {
- Input_section_list::iterator p;
- for (p = this->input_sections_.begin();
- p != this->input_sections_.end();
- ++p)
- p->print_merge_stats(this->name_);
- }
- // Set a fixed layout for the section. Used for incremental update links.
- void
- Output_section::set_fixed_layout(uint64_t sh_addr, off_t sh_offset,
- off_t sh_size, uint64_t sh_addralign)
- {
- this->addralign_ = sh_addralign;
- this->set_current_data_size(sh_size);
- if ((this->flags_ & elfcpp::SHF_ALLOC) != 0)
- this->set_address(sh_addr);
- this->set_file_offset(sh_offset);
- this->finalize_data_size();
- this->free_list_.init(sh_size, false);
- this->has_fixed_layout_ = true;
- }
- // Reserve space within the fixed layout for the section. Used for
- // incremental update links.
- void
- Output_section::reserve(uint64_t sh_offset, uint64_t sh_size)
- {
- this->free_list_.remove(sh_offset, sh_offset + sh_size);
- }
- // Allocate space from the free list for the section. Used for
- // incremental update links.
- off_t
- Output_section::allocate(off_t len, uint64_t addralign)
- {
- return this->free_list_.allocate(len, addralign, 0);
- }
- // Output segment methods.
- Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
- : vaddr_(0),
- paddr_(0),
- memsz_(0),
- align_(0),
- max_align_(0),
- min_p_align_(0),
- offset_(0),
- filesz_(0),
- type_(type),
- flags_(flags),
- is_max_align_known_(false),
- are_addresses_set_(false),
- is_large_data_segment_(false),
- is_unique_segment_(false)
- {
- // The ELF ABI specifies that a PT_TLS segment always has PF_R as
- // the flags.
- if (type == elfcpp::PT_TLS)
- this->flags_ = elfcpp::PF_R;
- }
- // Add an Output_section to a PT_LOAD Output_segment.
- void
- 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());
- this->update_flags_for_output_section(seg_flags);
- // 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
- gold_assert(order != ORDER_INVALID);
- this->output_lists_[order].push_back(os);
- }
- // Add an Output_section to a non-PT_LOAD Output_segment.
- 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_);
- this->update_flags_for_output_section(seg_flags);
- this->output_lists_[0].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)
- {
- for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
- {
- Output_data_list* pdl = &this->output_lists_[i];
- for (Output_data_list::iterator p = pdl->begin(); p != pdl->end(); ++p)
- {
- if (*p == os)
- {
- pdl->erase(p);
- return;
- }
- }
- }
- gold_unreachable();
- }
- // Add an Output_data (which need not be an Output_section) to the
- // start of a segment.
- void
- Output_segment::add_initial_output_data(Output_data* od)
- {
- gold_assert(!this->is_max_align_known_);
- 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 (not counting TLS sections)
- // is a relro section.
- bool
- Output_segment::is_first_section_relro() const
- {
- for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
- {
- if (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.
- uint64_t
- Output_segment::maximum_alignment()
- {
- if (!this->is_max_align_known_)
- {
- 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 this->max_align_;
- }
- // Return the maximum alignment of a list of Output_data.
- uint64_t
- Output_segment::maximum_alignment_list(const Output_data_list* pdl)
- {
- uint64_t ret = 0;
- for (Output_data_list::const_iterator p = pdl->begin();
- p != pdl->end();
- ++p)
- {
- uint64_t addralign = (*p)->addralign();
- if (addralign > ret)
- ret = addralign;
- }
- return ret;
- }
- // Return whether this segment has any dynamic relocs.
- bool
- Output_segment::has_dynamic_reloc() const
- {
- 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 whether this Output_data_list has any dynamic relocs.
- bool
- Output_segment::has_dynamic_reloc_list(const Output_data_list* pdl) const
- {
- for (Output_data_list::const_iterator p = pdl->begin();
- p != pdl->end();
- ++p)
- 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.
- // 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 Target* target,
- Layout* layout, bool reset,
- uint64_t addr,
- 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 an abi page boundary.
- if (parameters->options().relro()
- && this->is_first_section_relro()
- && (!this->are_addresses_set_ || reset))
- {
- uint64_t relro_size = 0;
- off_t off = *poff;
- uint64_t max_align = 0;
- for (int i = 0; i <= static_cast<int>(ORDER_RELRO_LAST); ++i)
- {
- Output_data_list* pdl = &this->output_lists_[i];
- Output_data_list::iterator p;
- for (p = pdl->begin(); p != pdl->end(); ++p)
- {
- 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;
- }
- // Ignore the size of the .tbss section.
- if ((*p)->is_section_flag_set(elfcpp::SHF_TLS)
- && (*p)->is_section_type(elfcpp::SHT_NOBITS))
- continue;
- relro_size = align_address(relro_size, align);
- if ((*p)->is_address_valid())
- relro_size += (*p)->data_size();
- else
- {
- // FIXME: This could be faster.
- (*p)->set_address_and_file_offset(relro_size,
- relro_size);
- relro_size += (*p)->data_size();
- (*p)->reset_address_and_file_offset();
- }
- }
- if (p != pdl->end())
- break;
- }
- 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().abi_pagesize();
- // Align to offset N such that (N + RELRO_SIZE) % PAGE_ALIGN == 0.
- uint64_t desired_align = page_align - (aligned_size % page_align);
- if (desired_align < off % page_align)
- off += page_align;
- off += desired_align - off % page_align;
- addr += off - orig_off;
- orig_off = off;
- *poff = off;
- }
- if (!reset && this->are_addresses_set_)
- {
- gold_assert(this->paddr_ == addr);
- addr = this->vaddr_;
- }
- else
- {
- this->vaddr_ = addr;
- this->paddr_ = addr;
- this->are_addresses_set_ = true;
- }
- in_tls = false;
- this->offset_ = orig_off;
- off_t off = 0;
- off_t foff = *poff;
- uint64_t ret = 0;
- for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
- {
- if (i == static_cast<int>(ORDER_RELRO_LAST))
- {
- *poff += last_relro_pad;
- foff += 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, &foff, pshndx,
- &in_tls);
- // FOFF tracks the last offset used for the file image,
- // and *POFF tracks the last offset used for the memory image.
- // When not using a linker script, bss sections should all
- // be processed in the ORDER_SMALL_BSS and later buckets.
- gold_assert(*poff == foff
- || i == static_cast<int>(ORDER_TLS_BSS)
- || i >= static_cast<int>(ORDER_SMALL_BSS)
- || layout->script_options()->saw_sections_clause());
- this->filesz_ = foff - orig_off;
- off = foff;
- 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
- // segment is aligned.
- if (in_tls)
- {
- uint64_t segment_align = layout->tls_segment()->maximum_alignment();
- *poff = align_address(*poff, segment_align);
- }
- this->memsz_ = *poff - orig_off;
- // Ignore the file offset adjustments made by the BSS Output_data
- // objects.
- *poff = off;
- // If code segments must contain only code, and this code segment is
- // page-aligned in the file, then fill it out to a whole page with
- // code fill (the tail of the segment will not be within any section).
- // Thus the entire code segment can be mapped from the file as whole
- // pages and that mapping will contain only valid instructions.
- if (target->isolate_execinstr() && (this->flags() & elfcpp::PF_X) != 0)
- {
- uint64_t abi_pagesize = target->abi_pagesize();
- if (orig_off % abi_pagesize == 0 && off % abi_pagesize != 0)
- {
- size_t fill_size = abi_pagesize - (off % abi_pagesize);
- std::string fill_data;
- if (target->has_code_fill())
- fill_data = target->code_fill(fill_size);
- else
- fill_data.resize(fill_size); // Zero fill.
- Output_data_const* fill = new Output_data_const(fill_data, 0);
- fill->set_address(this->vaddr_ + this->memsz_);
- fill->set_file_offset(off);
- layout->add_relax_output(fill);
- off += fill_size;
- gold_assert(off % abi_pagesize == 0);
- ret += fill_size;
- gold_assert(ret % abi_pagesize == 0);
- gold_assert((uint64_t) this->filesz_ == this->memsz_);
- this->memsz_ = this->filesz_ += fill_size;
- *poff = off;
- }
- }
- return ret;
- }
- // Set the addresses and file offsets in a list of Output_data
- // structures.
- uint64_t
- Output_segment::set_section_list_addresses(Layout* layout, bool reset,
- Output_data_list* pdl,
- uint64_t addr, off_t* poff,
- off_t* pfoff,
- unsigned int* pshndx,
- bool* in_tls)
- {
- off_t startoff = *poff;
- // For incremental updates, we may allocate non-fixed sections from
- // free space in the file. This keeps track of the high-water mark.
- off_t maxoff = startoff;
- off_t off = startoff;
- off_t foff = *pfoff;
- for (Output_data_list::iterator p = pdl->begin();
- p != pdl->end();
- ++p)
- {
- bool is_bss = (*p)->is_section_type(elfcpp::SHT_NOBITS);
- bool is_tls = (*p)->is_section_flag_set(elfcpp::SHF_TLS);
- if (reset)
- (*p)->reset_address_and_file_offset();
- // When doing an incremental update or when using a linker script,
- // the section will most likely already have an address.
- if (!(*p)->is_address_valid())
- {
- uint64_t align = (*p)->addralign();
- if (is_tls)
- {
- // Give the first TLS section the alignment of the
- // entire TLS segment. Otherwise the TLS segment as a
- // whole may be misaligned.
- if (!*in_tls)
- {
- Output_segment* tls_segment = layout->tls_segment();
- gold_assert(tls_segment != NULL);
- uint64_t segment_align = tls_segment->maximum_alignment();
- gold_assert(segment_align >= align);
- align = segment_align;
- *in_tls = true;
- }
- }
- else
- {
- // If this is the first section after the TLS segment,
- // align it to at least the alignment of the TLS
- // segment, so that the size of the overall TLS segment
- // is aligned.
- if (*in_tls)
- {
- uint64_t segment_align =
- layout->tls_segment()->maximum_alignment();
- if (segment_align > align)
- align = segment_align;
- *in_tls = false;
- }
- }
- if (!parameters->incremental_update())
- {
- gold_assert(off == foff || is_bss);
- off = align_address(off, align);
- if (is_tls || !is_bss)
- foff = off;
- (*p)->set_address_and_file_offset(addr + (off - startoff), foff);
- }
- else
- {
- // Incremental update: allocate file space from free list.
- (*p)->pre_finalize_data_size();
- off_t current_size = (*p)->current_data_size();
- off = layout->allocate(current_size, align, startoff);
- foff = off;
- if (off == -1)
- {
- gold_assert((*p)->output_section() != NULL);
- gold_fallback(_("out of patch space for section %s; "
- "relink with --incremental-full"),
- (*p)->output_section()->name());
- }
- (*p)->set_address_and_file_offset(addr + (off - startoff), foff);
- if ((*p)->data_size() > current_size)
- {
- gold_assert((*p)->output_section() != NULL);
- gold_fallback(_("%s: section changed size; "
- "relink with --incremental-full"),
- (*p)->output_section()->name());
- }
- }
- }
- else if (parameters->incremental_update())
- {
- // For incremental updates, use the fixed offset for the
- // high-water mark computation.
- off = (*p)->offset();
- foff = off;
- }
- else
- {
- // The script may have inserted a skip forward, but it
- // better not have moved backward.
- if ((*p)->address() >= addr + (off - startoff))
- {
- if (!is_bss && off > foff)
- gold_warning(_("script places BSS section in the middle "
- "of a LOAD segment; space will be allocated "
- "in the file"));
- off += (*p)->address() - (addr + (off - startoff));
- if (is_tls || !is_bss)
- foff = off;
- }
- else
- {
- if (!layout->script_options()->saw_sections_clause())
- gold_unreachable();
- else
- {
- Output_section* os = (*p)->output_section();
- // Cast to unsigned long long to avoid format warnings.
- unsigned long long previous_dot =
- static_cast<unsigned long long>(addr + (off - startoff));
- unsigned long long dot =
- static_cast<unsigned long long>((*p)->address());
- if (os == NULL)
- gold_error(_("dot moves backward in linker script "
- "from 0x%llx to 0x%llx"), previous_dot, dot);
- else
- gold_error(_("address of section '%s' moves backward "
- "from 0x%llx to 0x%llx"),
- os->name(), previous_dot, dot);
- }
- }
- (*p)->set_file_offset(foff);
- (*p)->finalize_data_size();
- }
- if (parameters->incremental_update())
- gold_debug(DEBUG_INCREMENTAL,
- "set_section_list_addresses: %08lx %08lx %s",
- static_cast<long>(off),
- static_cast<long>((*p)->data_size()),
- ((*p)->output_section() != NULL
- ? (*p)->output_section()->name() : "(special)"));
- // We want to ignore the size of a SHF_TLS SHT_NOBITS
- // section. Such a section does not affect the size of a
- // PT_LOAD segment.
- if (!is_tls || !is_bss)
- off += (*p)->data_size();
- // We don't allocate space in the file for SHT_NOBITS sections,
- // unless a script has force-placed one in the middle of a segment.
- if (!is_bss)
- foff = off;
- if (off > maxoff)
- maxoff = off;
- if ((*p)->is_section())
- {
- (*p)->set_out_shndx(*pshndx);
- ++*pshndx;
- }
- }
- *poff = maxoff;
- *pfoff = foff;
- return addr + (maxoff - startoff);
- }
- // For a non-PT_LOAD segment, set the offset from the sections, if
- // any. Add INCREASE to the file size and the memory size.
- void
- Output_segment::set_offset(unsigned int increase)
- {
- gold_assert(this->type_ != elfcpp::PT_LOAD);
- gold_assert(!this->are_addresses_set_);
- // 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;
- this->paddr_ = 0;
- this->are_addresses_set_ = true;
- this->memsz_ = 0;
- this->min_p_align_ = 0;
- this->offset_ = 0;
- this->filesz_ = 0;
- return;
- }
- // 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->vaddr_);
- this->are_addresses_set_ = true;
- this->offset_ = first->offset();
- if (last_data == NULL)
- this->filesz_ = 0;
- else
- this->filesz_ = (last_data->address()
- + last_data->data_size()
- - this->vaddr_);
- 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().abi_pagesize();
- uint64_t segment_end = this->vaddr_ + this->memsz_;
- if (parameters->incremental_update())
- {
- // The INCREASE_RELRO calculation is bypassed for an incremental
- // update, so we need to adjust the segment size manually here.
- segment_end = align_address(segment_end, page_align);
- this->memsz_ = segment_end - this->vaddr_;
- }
- else
- 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.
- if (this->type_ == elfcpp::PT_TLS)
- {
- uint64_t segment_align = this->maximum_alignment();
- gold_assert(this->vaddr_ == align_address(this->vaddr_, segment_align));
- this->memsz_ = align_address(this->memsz_, segment_align);
- }
- }
- // Set the TLS offsets of the sections in the PT_TLS segment.
- void
- Output_segment::set_tls_offsets()
- {
- gold_assert(this->type_ == elfcpp::PT_TLS);
- 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 first section.
- Output_section*
- Output_segment::first_section() 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 (*p)->output_section();
- }
- }
- return NULL;
- }
- // Return the number of Output_sections in an Output_segment.
- unsigned int
- Output_segment::output_section_count() const
- {
- 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.
- unsigned int
- Output_segment::output_section_count_list(const Output_data_list* pdl) const
- {
- unsigned int count = 0;
- for (Output_data_list::const_iterator p = pdl->begin();
- p != pdl->end();
- ++p)
- {
- if ((*p)->is_section())
- ++count;
- }
- return count;
- }
- // Return the section attached to the list segment with the lowest
- // load address. This is used when handling a PHDRS clause in a
- // linker script.
- Output_section*
- Output_segment::section_with_lowest_load_address() const
- {
- Output_section* found = NULL;
- uint64_t found_lma = 0;
- 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;
- }
- // Look through a list for a section with a lower load address.
- void
- Output_segment::lowest_load_address_in_list(const Output_data_list* pdl,
- Output_section** found,
- uint64_t* found_lma) const
- {
- for (Output_data_list::const_iterator p = pdl->begin();
- p != pdl->end();
- ++p)
- {
- if (!(*p)->is_section())
- continue;
- Output_section* os = static_cast<Output_section*>(*p);
- uint64_t lma = (os->has_load_address()
- ? os->load_address()
- : os->address());
- if (*found == NULL || lma < *found_lma)
- {
- *found = os;
- *found_lma = lma;
- }
- }
- }
- // Write the segment data into *OPHDR.
- template<int size, bool big_endian>
- void
- Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr)
- {
- ophdr->put_p_type(this->type_);
- ophdr->put_p_offset(this->offset_);
- ophdr->put_p_vaddr(this->vaddr_);
- ophdr->put_p_paddr(this->paddr_);
- ophdr->put_p_filesz(this->filesz_);
- ophdr->put_p_memsz(this->memsz_);
- ophdr->put_p_flags(this->flags_);
- ophdr->put_p_align(std::max(this->min_p_align_, this->maximum_alignment()));
- }
- // Write the section headers into V.
- template<int size, bool big_endian>
- unsigned char*
- Output_segment::write_section_headers(const Layout* layout,
- const Stringpool* secnamepool,
- unsigned char* v,
- 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
- // segments.
- if (this->type_ != elfcpp::PT_LOAD)
- return v;
- 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;
- }
- template<int size, bool big_endian>
- unsigned char*
- Output_segment::write_section_headers_list(const Layout* layout,
- const Stringpool* secnamepool,
- const Output_data_list* pdl,
- unsigned char* v,
- unsigned int* pshndx) const
- {
- const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
- for (Output_data_list::const_iterator p = pdl->begin();
- p != pdl->end();
- ++p)
- {
- if ((*p)->is_section())
- {
- const Output_section* ps = static_cast<const Output_section*>(*p);
- gold_assert(*pshndx == ps->out_shndx());
- elfcpp::Shdr_write<size, big_endian> oshdr(v);
- ps->write_header(layout, secnamepool, &oshdr);
- v += shdr_size;
- ++*pshndx;
- }
- }
- 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;
- 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.
- 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)
- : name_(name),
- o_(-1),
- file_size_(0),
- base_(NULL),
- map_is_anonymous_(false),
- map_is_allocated_(false),
- is_temporary_(false)
- {
- }
- // Try to open an existing file. Returns false if the file doesn't
- // exist, has a size of 0 or can't be mmapped. If BASE_NAME is not
- // NULL, open that file as the base for incremental linking, and
- // copy its contents to the new output file. This routine can
- // be called for incremental updates, in which case WRITABLE should
- // be true, or by the incremental-dump utility, in which case
- // WRITABLE should be false.
- bool
- Output_file::open_base_file(const char* base_name, bool writable)
- {
- // The name "-" means "stdout".
- if (strcmp(this->name_, "-") == 0)
- return false;
- bool use_base_file = base_name != NULL;
- if (!use_base_file)
- base_name = this->name_;
- else if (strcmp(base_name, this->name_) == 0)
- gold_fatal(_("%s: incremental base and output file name are the same"),
- base_name);
- // Don't bother opening files with a size of zero.
- struct stat s;
- if (::stat(base_name, &s) != 0)
- {
- gold_info(_("%s: stat: %s"), base_name, strerror(errno));
- return false;
- }
- if (s.st_size == 0)
- {
- gold_info(_("%s: incremental base file is empty"), base_name);
- return false;
- }
- // If we're using a base file, we want to open it read-only.
- if (use_base_file)
- writable = false;
- int oflags = writable ? O_RDWR : O_RDONLY;
- int o = open_descriptor(-1, base_name, oflags, 0);
- if (o < 0)
- {
- gold_info(_("%s: open: %s"), base_name, strerror(errno));
- return false;
- }
- // If the base file and the output file are different, open a
- // new output file and read the contents from the base file into
- // the newly-mapped region.
- if (use_base_file)
- {
- this->open(s.st_size);
- ssize_t bytes_to_read = s.st_size;
- unsigned char* p = this->base_;
- while (bytes_to_read > 0)
- {
- ssize_t len = ::read(o, p, bytes_to_read);
- if (len < 0)
- {
- gold_info(_("%s: read failed: %s"), base_name, strerror(errno));
- return false;
- }
- if (len == 0)
- {
- gold_info(_("%s: file too short: read only %lld of %lld bytes"),
- base_name,
- static_cast<long long>(s.st_size - bytes_to_read),
- static_cast<long long>(s.st_size));
- return false;
- }
- p += len;
- bytes_to_read -= len;
- }
- ::close(o);
- return true;
- }
- this->o_ = o;
- this->file_size_ = s.st_size;
- if (!this->map_no_anonymous(writable))
- {
- release_descriptor(o, true);
- this->o_ = -1;
- this->file_size_ = 0;
- return false;
- }
- return true;
- }
- // Open the output file.
- void
- Output_file::open(off_t file_size)
- {
- this->file_size_ = file_size;
- // Unlink the file first; otherwise the open() may fail if the file
- // is busy (e.g. it's an executable that's currently being executed).
- //
- // However, the linker may be part of a system where a zero-length
- // file is created for it to write to, with tight permissions (gcc
- // 2.95 did something like this). Unlinking the file would work
- // around those permission controls, so we only unlink if the file
- // has a non-zero size. We also unlink only regular files to avoid
- // trouble with directories/etc.
- //
- // If we fail, continue; this command is merely a best-effort attempt
- // to improve the odds for open().
- // We let the name "-" mean "stdout"
- if (!this->is_temporary_)
- {
- if (strcmp(this->name_, "-") == 0)
- this->o_ = STDOUT_FILENO;
- else
- {
- struct stat s;
- if (::stat(this->name_, &s) == 0
- && (S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
- {
- if (s.st_size != 0)
- ::unlink(this->name_);
- else if (!parameters->options().relocatable())
- {
- // If we don't unlink the existing file, add execute
- // permission where read permissions already exist
- // and where the umask permits.
- int mask = ::umask(0);
- ::umask(mask);
- s.st_mode |= (s.st_mode & 0444) >> 2;
- ::chmod(this->name_, s.st_mode & ~mask);
- }
- }
- int mode = parameters->options().relocatable() ? 0666 : 0777;
- 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;
- }
- }
- this->map();
- }
- // Resize the output file.
- void
- Output_file::resize(off_t file_size)
- {
- // If the mmap is mapping an anonymous memory buffer, this is easy:
- // just mremap to the new size. If it's mapping to a file, we want
- // to unmap to flush to the file, then remap after growing the file.
- if (this->map_is_anonymous_)
- {
- void* base;
- if (!this->map_is_allocated_)
- {
- base = ::mremap(this->base_, this->file_size_, file_size,
- MREMAP_MAYMOVE);
- if (base == MAP_FAILED)
- gold_fatal(_("%s: mremap: %s"), this->name_, strerror(errno));
- }
- else
- {
- base = realloc(this->base_, file_size);
- if (base == NULL)
- gold_nomem();
- if (file_size > this->file_size_)
- memset(static_cast<char*>(base) + this->file_size_, 0,
- file_size - this->file_size_);
- }
- this->base_ = static_cast<unsigned char*>(base);
- this->file_size_ = file_size;
- }
- else
- {
- this->unmap();
- this->file_size_ = file_size;
- if (!this->map_no_anonymous(true))
- gold_fatal(_("%s: mmap: %s"), this->name_, strerror(errno));
- }
- }
- // Map an anonymous block of memory which will later be written to the
- // file. Return whether the map succeeded.
- bool
- Output_file::map_anonymous()
- {
- void* base = ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if (base == MAP_FAILED)
- {
- base = malloc(this->file_size_);
- if (base == NULL)
- return false;
- memset(base, 0, this->file_size_);
- this->map_is_allocated_ = true;
- }
- this->base_ = static_cast<unsigned char*>(base);
- this->map_is_anonymous_ = true;
- return true;
- }
- // Map the file into memory. Return whether the mapping succeeded.
- // If WRITABLE is true, map with write access.
- bool
- Output_file::map_no_anonymous(bool writable)
- {
- const int o = this->o_;
- // If the output file is not a regular file, don't try to mmap it;
- // instead, we'll mmap a block of memory (an anonymous buffer), and
- // then later write the buffer to the file.
- void* base;
- struct stat statbuf;
- if (o == STDOUT_FILENO || o == STDERR_FILENO
- || ::fstat(o, &statbuf) != 0
- || !S_ISREG(statbuf.st_mode)
- || this->is_temporary_)
- return false;
- // Ensure that we have disk space available for the file. If we
- // don't do this, it is possible that we will call munmap, close,
- // and exit with dirty buffers still in the cache with no assigned
- // disk blocks. If the disk is out of space at that point, the
- // output file will wind up incomplete, but we will have already
- // exited. The alternative to fallocate would be to use fdatasync,
- // but that would be a more significant performance hit.
- if (writable)
- {
- int err = gold_fallocate(o, 0, this->file_size_);
- if (err != 0)
- gold_fatal(_("%s: %s"), this->name_, strerror(err));
- }
- // Map the file into memory.
- int prot = PROT_READ;
- if (writable)
- prot |= PROT_WRITE;
- base = ::mmap(NULL, this->file_size_, prot, MAP_SHARED, o, 0);
- // The mmap call might fail because of file system issues: the file
- // system might not support mmap at all, or it might not support
- // mmap with PROT_WRITE.
- if (base == MAP_FAILED)
- return false;
- this->map_is_anonymous_ = false;
- this->base_ = static_cast<unsigned char*>(base);
- return true;
- }
- // Map the file into memory.
- void
- Output_file::map()
- {
- if (parameters->options().mmap_output_file()
- && this->map_no_anonymous(true))
- return;
- // The mmap call might fail because of file system issues: the file
- // system might not support mmap at all, or it might not support
- // mmap with PROT_WRITE. I'm not sure which errno values we will
- // see in all cases, so if the mmap fails for any reason and we
- // don't care about file contents, try for an anonymous map.
- if (this->map_anonymous())
- return;
- gold_fatal(_("%s: mmap: failed to allocate %lu bytes for output file: %s"),
- this->name_, static_cast<unsigned long>(this->file_size_),
- strerror(errno));
- }
- // Unmap the file from memory.
- void
- Output_file::unmap()
- {
- if (this->map_is_anonymous_)
- {
- // We've already written out the data, so there is no reason to
- // waste time unmapping or freeing the memory.
- }
- else
- {
- if (::munmap(this->base_, this->file_size_) < 0)
- gold_error(_("%s: munmap: %s"), this->name_, strerror(errno));
- }
- this->base_ = NULL;
- }
- // Close the output file.
- void
- Output_file::close()
- {
- // If the map isn't file-backed, we need to write it now.
- if (this->map_is_anonymous_ && !this->is_temporary_)
- {
- size_t bytes_to_write = this->file_size_;
- size_t offset = 0;
- while (bytes_to_write > 0)
- {
- ssize_t bytes_written = ::write(this->o_, this->base_ + offset,
- bytes_to_write);
- if (bytes_written == 0)
- gold_error(_("%s: write: unexpected 0 return-value"), this->name_);
- else if (bytes_written < 0)
- gold_error(_("%s: write: %s"), this->name_, strerror(errno));
- else
- {
- bytes_to_write -= bytes_written;
- offset += bytes_written;
- }
- }
- }
- this->unmap();
- // We don't close stdout or stderr
- if (this->o_ != STDOUT_FILENO
- && this->o_ != STDERR_FILENO
- && !this->is_temporary_)
- if (::close(this->o_) < 0)
- gold_error(_("%s: close: %s"), this->name_, strerror(errno));
- this->o_ = -1;
- }
- // Instantiate the templates we need. We could use the configure
- // script to restrict this to only the ones for implemented targets.
- #ifdef HAVE_TARGET_32_LITTLE
- template
- off_t
- Output_section::add_input_section<32, false>(
- Layout* layout,
- Sized_relobj_file<32, false>* object,
- unsigned int shndx,
- const char* secname,
- const elfcpp::Shdr<32, false>& shdr,
- unsigned int reloc_shndx,
- bool have_sections_script);
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- off_t
- Output_section::add_input_section<32, true>(
- Layout* layout,
- Sized_relobj_file<32, true>* object,
- unsigned int shndx,
- const char* secname,
- const elfcpp::Shdr<32, true>& shdr,
- unsigned int reloc_shndx,
- bool have_sections_script);
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- off_t
- Output_section::add_input_section<64, false>(
- Layout* layout,
- Sized_relobj_file<64, false>* object,
- unsigned int shndx,
- const char* secname,
- const elfcpp::Shdr<64, false>& shdr,
- unsigned int reloc_shndx,
- bool have_sections_script);
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- off_t
- Output_section::add_input_section<64, true>(
- Layout* layout,
- Sized_relobj_file<64, true>* object,
- unsigned int shndx,
- const char* secname,
- const elfcpp::Shdr<64, true>& shdr,
- unsigned int reloc_shndx,
- bool have_sections_script);
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_reloc<elfcpp::SHT_REL, false, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_reloc<elfcpp::SHT_REL, false, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_reloc<elfcpp::SHT_REL, false, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_reloc<elfcpp::SHT_REL, false, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_reloc<elfcpp::SHT_REL, true, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_reloc<elfcpp::SHT_REL, true, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_reloc<elfcpp::SHT_REL, true, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_reloc<elfcpp::SHT_REL, true, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_reloc<elfcpp::SHT_RELA, false, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_reloc<elfcpp::SHT_RELA, false, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_reloc<elfcpp::SHT_RELA, false, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_reloc<elfcpp::SHT_RELA, false, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_reloc<elfcpp::SHT_RELA, true, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_reloc<elfcpp::SHT_RELA, true, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_reloc<elfcpp::SHT_RELA, true, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_reloc<elfcpp::SHT_RELA, true, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_relocatable_relocs<elfcpp::SHT_REL, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_relocatable_relocs<elfcpp::SHT_REL, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_relocatable_relocs<elfcpp::SHT_REL, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_relocatable_relocs<elfcpp::SHT_REL, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_relocatable_relocs<elfcpp::SHT_RELA, 32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_relocatable_relocs<elfcpp::SHT_RELA, 32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_relocatable_relocs<elfcpp::SHT_RELA, 64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_relocatable_relocs<elfcpp::SHT_RELA, 64, true>;
- #endif
- #ifdef HAVE_TARGET_32_LITTLE
- template
- class Output_data_group<32, false>;
- #endif
- #ifdef HAVE_TARGET_32_BIG
- template
- class Output_data_group<32, true>;
- #endif
- #ifdef HAVE_TARGET_64_LITTLE
- template
- class Output_data_group<64, false>;
- #endif
- #ifdef HAVE_TARGET_64_BIG
- template
- class Output_data_group<64, true>;
- #endif
- template
- class Output_data_got<32, false>;
- template
- class Output_data_got<32, true>;
- template
- class Output_data_got<64, false>;
- template
- class Output_data_got<64, true>;
- } // End namespace gold.
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