// reloc.cc -- relocate input files for gold.
+// Copyright 2006, 2007, 2008 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 <algorithm>
+
#include "workqueue.h"
-#include "object.h"
+#include "symtab.h"
#include "output.h"
+#include "merge.h"
+#include "object.h"
+#include "target-reloc.h"
#include "reloc.h"
namespace gold
{
+// Read_relocs methods.
+
+// These tasks just read the relocation information from the file.
+// After reading it, the start another task to process the
+// information. These tasks requires access to the file.
+
+Task_token*
+Read_relocs::is_runnable()
+{
+ return this->object_->is_locked() ? this->object_->token() : NULL;
+}
+
+// Lock the file.
+
+void
+Read_relocs::locks(Task_locker* tl)
+{
+ tl->add(this, this->object_->token());
+}
+
+// Read the relocations and then start a Scan_relocs_task.
+
+void
+Read_relocs::run(Workqueue* workqueue)
+{
+ Read_relocs_data *rd = new Read_relocs_data;
+ this->object_->read_relocs(rd);
+ this->object_->release();
+
+ workqueue->queue_next(new Scan_relocs(this->options_, this->symtab_,
+ this->layout_, this->object_, rd,
+ this->symtab_lock_, this->blocker_));
+}
+
+// Return a debugging name for the task.
+
+std::string
+Read_relocs::get_name() const
+{
+ return "Read_relocs " + this->object_->name();
+}
+
+// Scan_relocs methods.
+
+// These tasks scan the relocations read by Read_relocs and mark up
+// the symbol table to indicate which relocations are required. We
+// use a lock on the symbol table to keep them from interfering with
+// each other.
+
+Task_token*
+Scan_relocs::is_runnable()
+{
+ if (!this->symtab_lock_->is_writable())
+ return this->symtab_lock_;
+ if (this->object_->is_locked())
+ return this->object_->token();
+ return NULL;
+}
+
+// Return the locks we hold: one on the file, one on the symbol table
+// and one blocker.
+
+void
+Scan_relocs::locks(Task_locker* tl)
+{
+ tl->add(this, this->object_->token());
+ tl->add(this, this->symtab_lock_);
+ tl->add(this, this->blocker_);
+}
+
+// Scan the relocs.
+
+void
+Scan_relocs::run(Workqueue*)
+{
+ this->object_->scan_relocs(this->options_, this->symtab_, this->layout_,
+ this->rd_);
+ this->object_->release();
+ delete this->rd_;
+ this->rd_ = NULL;
+}
+
+// Return a debugging name for the task.
+
+std::string
+Scan_relocs::get_name() const
+{
+ return "Scan_relocs " + this->object_->name();
+}
+
// Relocate_task methods.
-// These tasks are always runnable.
+// We may have to wait for the output sections to be written.
-Task::Is_runnable_type
-Relocate_task::is_runnable(Workqueue*)
+Task_token*
+Relocate_task::is_runnable()
{
- return IS_RUNNABLE;
+ if (this->object_->relocs_must_follow_section_writes()
+ && this->output_sections_blocker_->is_blocked())
+ return this->output_sections_blocker_;
+
+ if (this->object_->is_locked())
+ return this->object_->token();
+
+ return NULL;
}
// We want to lock the file while we run. We want to unblock
-// FINAL_BLOCKER when we are done.
+// INPUT_SECTIONS_BLOCKER and FINAL_BLOCKER when we are done.
+// INPUT_SECTIONS_BLOCKER may be NULL.
+
+void
+Relocate_task::locks(Task_locker* tl)
+{
+ if (this->input_sections_blocker_ != NULL)
+ tl->add(this, this->input_sections_blocker_);
+ tl->add(this, this->final_blocker_);
+ tl->add(this, this->object_->token());
+}
+
+// Run the task.
+
+void
+Relocate_task::run(Workqueue*)
+{
+ this->object_->relocate(this->options_, this->symtab_, this->layout_,
+ this->of_);
-class Relocate_task::Relocate_locker : public Task_locker
+ // This is normally the last thing we will do with an object, so
+ // uncache all views.
+ this->object_->clear_view_cache_marks();
+
+ this->object_->release();
+}
+
+// Return a debugging name for the task.
+
+std::string
+Relocate_task::get_name() const
+{
+ return "Relocate_task " + this->object_->name();
+}
+
+// Read the relocs and local symbols from the object file and store
+// the information in RD.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
+{
+ rd->relocs.clear();
+
+ unsigned int shnum = this->shnum();
+ if (shnum == 0)
+ return;
+
+ rd->relocs.reserve(shnum / 2);
+
+ const Output_sections& out_sections(this->output_sections());
+ const std::vector<Address>& out_offsets(this->section_offsets_);
+
+ const unsigned char *pshdrs = this->get_view(this->elf_file_.shoff(),
+ shnum * This::shdr_size,
+ true, true);
+ // Skip the first, dummy, section.
+ const unsigned char *ps = pshdrs + This::shdr_size;
+ for (unsigned int i = 1; i < shnum; ++i, ps += This::shdr_size)
+ {
+ typename This::Shdr shdr(ps);
+
+ unsigned int sh_type = shdr.get_sh_type();
+ if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
+ continue;
+
+ unsigned int shndx = this->adjust_shndx(shdr.get_sh_info());
+ if (shndx >= shnum)
+ {
+ this->error(_("relocation section %u has bad info %u"),
+ i, shndx);
+ continue;
+ }
+
+ Output_section* os = out_sections[shndx];
+ if (os == NULL)
+ continue;
+
+ // We are scanning relocations in order to fill out the GOT and
+ // PLT sections. Relocations for sections which are not
+ // allocated (typically debugging sections) should not add new
+ // GOT and PLT entries. So we skip them unless this is a
+ // relocatable link or we need to emit relocations.
+ typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size);
+ bool is_section_allocated = ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC)
+ != 0);
+ if (!is_section_allocated
+ && !parameters->options().relocatable()
+ && !parameters->options().emit_relocs())
+ continue;
+
+ if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_)
+ {
+ this->error(_("relocation section %u uses unexpected "
+ "symbol table %u"),
+ i, this->adjust_shndx(shdr.get_sh_link()));
+ continue;
+ }
+
+ off_t sh_size = shdr.get_sh_size();
+
+ unsigned int reloc_size;
+ if (sh_type == elfcpp::SHT_REL)
+ reloc_size = elfcpp::Elf_sizes<size>::rel_size;
+ else
+ reloc_size = elfcpp::Elf_sizes<size>::rela_size;
+ if (reloc_size != shdr.get_sh_entsize())
+ {
+ this->error(_("unexpected entsize for reloc section %u: %lu != %u"),
+ i, static_cast<unsigned long>(shdr.get_sh_entsize()),
+ reloc_size);
+ continue;
+ }
+
+ size_t reloc_count = sh_size / reloc_size;
+ if (static_cast<off_t>(reloc_count * reloc_size) != sh_size)
+ {
+ this->error(_("reloc section %u size %lu uneven"),
+ i, static_cast<unsigned long>(sh_size));
+ continue;
+ }
+
+ rd->relocs.push_back(Section_relocs());
+ Section_relocs& sr(rd->relocs.back());
+ sr.reloc_shndx = i;
+ sr.data_shndx = shndx;
+ sr.contents = this->get_lasting_view(shdr.get_sh_offset(), sh_size,
+ true, true);
+ sr.sh_type = sh_type;
+ sr.reloc_count = reloc_count;
+ sr.output_section = os;
+ sr.needs_special_offset_handling = out_offsets[shndx] == invalid_address;
+ sr.is_data_section_allocated = is_section_allocated;
+ }
+
+ // Read the local symbols.
+ gold_assert(this->symtab_shndx_ != -1U);
+ if (this->symtab_shndx_ == 0 || this->local_symbol_count_ == 0)
+ rd->local_symbols = NULL;
+ else
+ {
+ typename This::Shdr symtabshdr(pshdrs
+ + this->symtab_shndx_ * This::shdr_size);
+ gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+ const int sym_size = This::sym_size;
+ const unsigned int loccount = this->local_symbol_count_;
+ gold_assert(loccount == symtabshdr.get_sh_info());
+ off_t locsize = loccount * sym_size;
+ rd->local_symbols = this->get_lasting_view(symtabshdr.get_sh_offset(),
+ locsize, true, true);
+ }
+}
+
+// Scan the relocs and adjust the symbol table. This looks for
+// relocations which require GOT/PLT/COPY relocations.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd)
+{
+ Sized_target<size, big_endian>* target = this->sized_target();
+
+ const unsigned char* local_symbols;
+ if (rd->local_symbols == NULL)
+ local_symbols = NULL;
+ else
+ local_symbols = rd->local_symbols->data();
+
+ for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
+ p != rd->relocs.end();
+ ++p)
+ {
+ if (!parameters->options().relocatable())
+ {
+ // As noted above, when not generating an object file, we
+ // only scan allocated sections. We may see a non-allocated
+ // section here if we are emitting relocs.
+ if (p->is_data_section_allocated)
+ target->scan_relocs(options, symtab, layout, this, p->data_shndx,
+ p->sh_type, p->contents->data(),
+ p->reloc_count, p->output_section,
+ p->needs_special_offset_handling,
+ this->local_symbol_count_,
+ local_symbols);
+ if (parameters->options().emit_relocs())
+ this->emit_relocs_scan(options, symtab, layout, local_symbols, p);
+ }
+ else
+ {
+ Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
+ gold_assert(rr != NULL);
+ rr->set_reloc_count(p->reloc_count);
+ target->scan_relocatable_relocs(options, symtab, layout, this,
+ p->data_shndx, p->sh_type,
+ p->contents->data(),
+ p->reloc_count,
+ p->output_section,
+ p->needs_special_offset_handling,
+ this->local_symbol_count_,
+ local_symbols,
+ rr);
+ }
+
+ delete p->contents;
+ p->contents = NULL;
+ }
+
+ if (rd->local_symbols != NULL)
+ {
+ delete rd->local_symbols;
+ rd->local_symbols = NULL;
+ }
+}
+
+// This is a strategy class we use when scanning for --emit-relocs.
+
+template<int sh_type>
+class Emit_relocs_strategy
{
public:
- Relocate_locker(Task_token& token, Workqueue* workqueue,
- Object* object)
- : blocker_(token, workqueue), objlock_(*object)
- { }
-
- private:
- Task_locker_block blocker_;
- Task_locker_obj<Object> objlock_;
+ // A local non-section symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ local_non_section_strategy(unsigned int, Relobj*, unsigned int)
+ { return Relocatable_relocs::RELOC_COPY; }
+
+ // A local section symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ local_section_strategy(unsigned int, Relobj*)
+ {
+ if (sh_type == elfcpp::SHT_RELA)
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
+ else
+ {
+ // The addend is stored in the section contents. Since this
+ // is not a relocatable link, we are going to apply the
+ // relocation contents to the section as usual. This means
+ // that we have no way to record the original addend. If the
+ // original addend is not zero, there is basically no way for
+ // the user to handle this correctly. Caveat emptor.
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0;
+ }
+ }
+
+ // A global symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ global_strategy(unsigned int, Relobj*, unsigned int)
+ { return Relocatable_relocs::RELOC_COPY; }
};
-Task_locker*
-Relocate_task::locks(Workqueue* workqueue)
+// Scan the input relocations for --emit-relocs.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::emit_relocs_scan(
+ const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ const unsigned char* plocal_syms,
+ const Read_relocs_data::Relocs_list::iterator& p)
{
- return new Relocate_locker(*this->final_blocker_, workqueue,
- this->object_);
+ Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
+ gold_assert(rr != NULL);
+ rr->set_reloc_count(p->reloc_count);
+
+ if (p->sh_type == elfcpp::SHT_REL)
+ this->emit_relocs_scan_reltype<elfcpp::SHT_REL>(options, symtab, layout,
+ plocal_syms, p, rr);
+ else
+ {
+ gold_assert(p->sh_type == elfcpp::SHT_RELA);
+ this->emit_relocs_scan_reltype<elfcpp::SHT_RELA>(options, symtab,
+ layout, plocal_syms, p,
+ rr);
+ }
}
-// Run the task.
+// Scan the input relocation for --emit-relocs, templatized on the
+// type of the relocation section.
+template<int size, bool big_endian>
+template<int sh_type>
void
-Relocate_task::run(Workqueue*)
+Sized_relobj<size, big_endian>::emit_relocs_scan_reltype(
+ const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ const unsigned char* plocal_syms,
+ const Read_relocs_data::Relocs_list::iterator& p,
+ Relocatable_relocs* rr)
{
- this->object_->relocate(this->options_, this->symtab_, this->sympool_,
- this->of_);
+ scan_relocatable_relocs<size, big_endian, sh_type,
+ Emit_relocs_strategy<sh_type> >(
+ options,
+ symtab,
+ layout,
+ this,
+ p->data_shndx,
+ p->contents->data(),
+ p->reloc_count,
+ p->output_section,
+ p->needs_special_offset_handling,
+ this->local_symbol_count_,
+ plocal_syms,
+ rr);
}
// Relocate the input sections and write out the local symbols.
template<int size, bool big_endian>
void
-Sized_object<size, big_endian>::do_relocate(const General_options&,
+Sized_relobj<size, big_endian>::do_relocate(const General_options& options,
const Symbol_table* symtab,
- const Stringpool* sympool,
+ const Layout* layout,
Output_file* of)
{
unsigned int shnum = this->shnum();
// Read the section headers.
- const unsigned char* pshdrs = this->get_view(this->shoff_,
- shnum * This::shdr_size);
+ const unsigned char* pshdrs = this->get_view(this->elf_file_.shoff(),
+ shnum * This::shdr_size,
+ true, true);
Views views;
views.resize(shnum);
this->write_sections(pshdrs, of, &views);
+ // To speed up relocations, we set up hash tables for fast lookup of
+ // input offsets to output addresses.
+ this->initialize_input_to_output_maps();
+
// Apply relocations.
- this->relocate_sections(symtab, pshdrs, &views);
+ this->relocate_sections(options, symtab, layout, pshdrs, &views);
+
+ // After we've done the relocations, we release the hash tables,
+ // since we no longer need them.
+ this->free_input_to_output_maps();
// Write out the accumulated views.
for (unsigned int i = 1; i < shnum; ++i)
{
if (views[i].view != NULL)
- of->write_output_view(views[i].offset, views[i].view_size,
- views[i].view);
+ {
+ if (!views[i].is_postprocessing_view)
+ {
+ if (views[i].is_input_output_view)
+ of->write_input_output_view(views[i].offset,
+ views[i].view_size,
+ views[i].view);
+ else
+ of->write_output_view(views[i].offset, views[i].view_size,
+ views[i].view);
+ }
+ }
}
// Write out the local symbols.
- this->write_local_symbols(of, sympool);
+ this->write_local_symbols(of, layout->sympool(), layout->dynpool(),
+ layout->symtab_xindex(), layout->dynsym_xindex());
+
+ // We should no longer need the local symbol values.
+ this->clear_local_symbols();
}
+// Sort a Read_multiple vector by file offset.
+struct Read_multiple_compare
+{
+ inline bool
+ operator()(const File_read::Read_multiple_entry& rme1,
+ const File_read::Read_multiple_entry& rme2) const
+ { return rme1.file_offset < rme2.file_offset; }
+};
+
// Write section data to the output file. PSHDRS points to the
// section headers. Record the views in *PVIEWS for use when
// relocating.
template<int size, bool big_endian>
void
-Sized_object<size, big_endian>::write_sections(const unsigned char* pshdrs,
+Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
Output_file* of,
Views* pviews)
{
unsigned int shnum = this->shnum();
- std::vector<Map_to_output>& map_sections(this->map_to_output());
+ const Output_sections& out_sections(this->output_sections());
+ const std::vector<Address>& out_offsets(this->section_offsets_);
+
+ File_read::Read_multiple rm;
+ bool is_sorted = true;
const unsigned char* p = pshdrs + This::shdr_size;
for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
pvs->view = NULL;
- const Output_section* os = map_sections[i].output_section;
+ const Output_section* os = out_sections[i];
if (os == NULL)
continue;
+ Address output_offset = out_offsets[i];
typename This::Shdr shdr(p);
if (shdr.get_sh_type() == elfcpp::SHT_NOBITS)
continue;
- assert(map_sections[i].offset >= 0
- && map_sections[i].offset < os->data_size());
- off_t start = os->offset() + map_sections[i].offset;
- off_t sh_size = shdr.get_sh_size();
+ if ((parameters->options().relocatable()
+ || parameters->options().emit_relocs())
+ && (shdr.get_sh_type() == elfcpp::SHT_REL
+ || shdr.get_sh_type() == elfcpp::SHT_RELA)
+ && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+ {
+ // This is a reloc section in a relocatable link or when
+ // emitting relocs. We don't need to read the input file.
+ // The size and file offset are stored in the
+ // Relocatable_relocs structure.
+ Relocatable_relocs* rr = this->relocatable_relocs(i);
+ gold_assert(rr != NULL);
+ Output_data* posd = rr->output_data();
+ gold_assert(posd != NULL);
+
+ pvs->offset = posd->offset();
+ pvs->view_size = posd->data_size();
+ pvs->view = of->get_output_view(pvs->offset, pvs->view_size);
+ pvs->address = posd->address();
+ pvs->is_input_output_view = false;
+ pvs->is_postprocessing_view = false;
+
+ continue;
+ }
+
+ // In the normal case, this input section is simply mapped to
+ // the output section at offset OUTPUT_OFFSET.
+
+ // However, if OUTPUT_OFFSET == INVALID_ADDRESS, then input data is
+ // handled specially--e.g., a .eh_frame section. The relocation
+ // routines need to check for each reloc where it should be
+ // applied. For this case, we need an input/output view for the
+ // entire contents of the section in the output file. We don't
+ // want to copy the contents of the input section to the output
+ // section; the output section contents were already written,
+ // and we waited for them in Relocate_task::is_runnable because
+ // relocs_must_follow_section_writes is set for the object.
+
+ // Regardless of which of the above cases is true, we have to
+ // check requires_postprocessing of the output section. If that
+ // is false, then we work with views of the output file
+ // directly. If it is true, then we work with a separate
+ // buffer, and the output section is responsible for writing the
+ // final data to the output file.
+
+ off_t output_section_offset;
+ Address output_section_size;
+ if (!os->requires_postprocessing())
+ {
+ output_section_offset = os->offset();
+ output_section_size = convert_types<Address, off_t>(os->data_size());
+ }
+ else
+ {
+ output_section_offset = 0;
+ output_section_size =
+ convert_types<Address, off_t>(os->postprocessing_buffer_size());
+ }
+
+ off_t view_start;
+ section_size_type view_size;
+ if (output_offset != invalid_address)
+ {
+ view_start = output_section_offset + output_offset;
+ view_size = convert_to_section_size_type(shdr.get_sh_size());
+ }
+ else
+ {
+ view_start = output_section_offset;
+ view_size = convert_to_section_size_type(output_section_size);
+ }
+
+ if (view_size == 0)
+ continue;
+
+ gold_assert(output_offset == invalid_address
+ || output_offset + view_size <= output_section_size);
+
+ unsigned char* view;
+ if (os->requires_postprocessing())
+ {
+ unsigned char* buffer = os->postprocessing_buffer();
+ view = buffer + view_start;
+ if (output_offset != invalid_address)
+ {
+ off_t sh_offset = shdr.get_sh_offset();
+ if (!rm.empty() && rm.back().file_offset > sh_offset)
+ is_sorted = false;
+ rm.push_back(File_read::Read_multiple_entry(sh_offset,
+ view_size, view));
+ }
+ }
+ else
+ {
+ if (output_offset == invalid_address)
+ view = of->get_input_output_view(view_start, view_size);
+ else
+ {
+ view = of->get_output_view(view_start, view_size);
+ off_t sh_offset = shdr.get_sh_offset();
+ if (!rm.empty() && rm.back().file_offset > sh_offset)
+ is_sorted = false;
+ rm.push_back(File_read::Read_multiple_entry(sh_offset,
+ view_size, view));
+ }
+ }
- unsigned char* view = of->get_output_view(start, sh_size);
- this->input_file()->file().read(shdr.get_sh_offset(),
- sh_size,
- view);
pvs->view = view;
- pvs->address = os->address() + map_sections[i].offset;
- pvs->offset = start;
- pvs->view_size = sh_size;
+ pvs->address = os->address();
+ if (output_offset != invalid_address)
+ pvs->address += output_offset;
+ pvs->offset = view_start;
+ pvs->view_size = view_size;
+ pvs->is_input_output_view = output_offset == invalid_address;
+ pvs->is_postprocessing_view = os->requires_postprocessing();
+ }
+
+ // Actually read the data.
+ if (!rm.empty())
+ {
+ if (!is_sorted)
+ std::sort(rm.begin(), rm.end(), Read_multiple_compare());
+ this->read_multiple(rm);
}
}
template<int size, bool big_endian>
void
-Sized_object<size, big_endian>::relocate_sections(const Symbol_table* symtab,
- const unsigned char* pshdrs,
- Views* pviews)
+Sized_relobj<size, big_endian>::relocate_sections(
+ const General_options& options,
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Views* pviews)
{
unsigned int shnum = this->shnum();
- std::vector<Map_to_output>& map_sections(this->map_to_output());
Sized_target<size, big_endian>* target = this->sized_target();
+ const Output_sections& out_sections(this->output_sections());
+ const std::vector<Address>& out_offsets(this->section_offsets_);
+
+ Relocate_info<size, big_endian> relinfo;
+ relinfo.options = &options;
+ relinfo.symtab = symtab;
+ relinfo.layout = layout;
+ relinfo.object = this;
+
const unsigned char* p = pshdrs + This::shdr_size;
for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
{
if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
continue;
- unsigned int index = shdr.get_sh_info();
+ unsigned int index = this->adjust_shndx(shdr.get_sh_info());
if (index >= this->shnum())
{
- fprintf(stderr, _("%s: %s: relocation section %u has bad info %u\n"),
- program_name, this->name().c_str(), i, index);
- gold_exit(false);
+ this->error(_("relocation section %u has bad info %u"),
+ i, index);
+ continue;
}
- if (map_sections[index].output_section == NULL)
+ Output_section* os = out_sections[index];
+ if (os == NULL)
{
// This relocation section is against a section which we
// discarded.
continue;
}
+ Address output_offset = out_offsets[index];
- assert((*pviews)[index].view != NULL);
+ gold_assert((*pviews)[index].view != NULL);
+ if (parameters->options().relocatable())
+ gold_assert((*pviews)[i].view != NULL);
- if (shdr.get_sh_link() != this->symtab_shnum_)
+ if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_)
{
- fprintf(stderr,
- _("%s: %s: relocation section %u uses unexpected "
- "symbol table %u\n"),
- program_name, this->name().c_str(), i, shdr.get_sh_link());
- gold_exit(false);
+ gold_error(_("relocation section %u uses unexpected "
+ "symbol table %u"),
+ i, this->adjust_shndx(shdr.get_sh_link()));
+ continue;
}
off_t sh_size = shdr.get_sh_size();
const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
- sh_size);
+ sh_size, true, false);
unsigned int reloc_size;
if (sh_type == elfcpp::SHT_REL)
if (reloc_size != shdr.get_sh_entsize())
{
- fprintf(stderr,
- _("%s: %s: unexpected entsize for reloc section %u: "
- "%lu != %u"),
- program_name, this->name().c_str(), i,
- static_cast<unsigned long>(shdr.get_sh_entsize()),
- reloc_size);
- gold_exit(false);
+ gold_error(_("unexpected entsize for reloc section %u: %lu != %u"),
+ i, static_cast<unsigned long>(shdr.get_sh_entsize()),
+ reloc_size);
+ continue;
}
size_t reloc_count = sh_size / reloc_size;
- if (reloc_count * reloc_size != sh_size)
+ if (static_cast<off_t>(reloc_count * reloc_size) != sh_size)
{
- fprintf(stderr, _("%s: %s: reloc section %u size %lu uneven"),
- program_name, this->name().c_str(), i,
- static_cast<unsigned long>(sh_size));
- gold_exit(false);
+ gold_error(_("reloc section %u size %lu uneven"),
+ i, static_cast<unsigned long>(sh_size));
+ continue;
+ }
+
+ gold_assert(output_offset != invalid_address
+ || this->relocs_must_follow_section_writes());
+
+ relinfo.reloc_shndx = i;
+ relinfo.data_shndx = index;
+ if (!parameters->options().relocatable())
+ {
+ target->relocate_section(&relinfo,
+ sh_type,
+ prelocs,
+ reloc_count,
+ os,
+ output_offset == invalid_address,
+ (*pviews)[index].view,
+ (*pviews)[index].address,
+ (*pviews)[index].view_size);
+ if (parameters->options().emit_relocs())
+ this->emit_relocs(&relinfo, i, sh_type, prelocs, reloc_count,
+ os, output_offset,
+ (*pviews)[index].view,
+ (*pviews)[index].address,
+ (*pviews)[index].view_size,
+ (*pviews)[i].view,
+ (*pviews)[i].view_size);
}
+ else
+ {
+ Relocatable_relocs* rr = this->relocatable_relocs(i);
+ target->relocate_for_relocatable(&relinfo,
+ sh_type,
+ prelocs,
+ reloc_count,
+ os,
+ output_offset,
+ rr,
+ (*pviews)[index].view,
+ (*pviews)[index].address,
+ (*pviews)[index].view_size,
+ (*pviews)[i].view,
+ (*pviews)[i].view_size);
+ }
+ }
+}
+
+// Emit the relocs for --emit-relocs.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::emit_relocs(
+ const Relocate_info<size, big_endian>* relinfo,
+ unsigned int i,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
+ section_size_type view_size,
+ unsigned char* reloc_view,
+ section_size_type reloc_view_size)
+{
+ if (sh_type == elfcpp::SHT_REL)
+ this->emit_relocs_reltype<elfcpp::SHT_REL>(relinfo, i, prelocs,
+ reloc_count, output_section,
+ offset_in_output_section,
+ view, address, view_size,
+ reloc_view, reloc_view_size);
+ else
+ {
+ gold_assert(sh_type == elfcpp::SHT_RELA);
+ this->emit_relocs_reltype<elfcpp::SHT_RELA>(relinfo, i, prelocs,
+ reloc_count, output_section,
+ offset_in_output_section,
+ view, address, view_size,
+ reloc_view, reloc_view_size);
+ }
+}
+
+// Emit the relocs for --emit-relocs, templatized on the type of the
+// relocation section.
+
+template<int size, bool big_endian>
+template<int sh_type>
+void
+Sized_relobj<size, big_endian>::emit_relocs_reltype(
+ const Relocate_info<size, big_endian>* relinfo,
+ unsigned int i,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
+ section_size_type view_size,
+ unsigned char* reloc_view,
+ section_size_type reloc_view_size)
+{
+ const Relocatable_relocs* rr = this->relocatable_relocs(i);
+ relocate_for_relocatable<size, big_endian, sh_type>(
+ relinfo,
+ prelocs,
+ reloc_count,
+ output_section,
+ offset_in_output_section,
+ rr,
+ view,
+ address,
+ view_size,
+ reloc_view,
+ reloc_view_size);
+}
+
+// Create merge hash tables for the local symbols. These are used to
+// speed up relocations.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::initialize_input_to_output_maps()
+{
+ const unsigned int loccount = this->local_symbol_count_;
+ for (unsigned int i = 1; i < loccount; ++i)
+ {
+ Symbol_value<size>& lv(this->local_values_[i]);
+ lv.initialize_input_to_output_map(this);
+ }
+}
+
+// Free merge hash tables for the local symbols.
- target->relocate_section(symtab, this, sh_type, prelocs, reloc_count,
- this->local_symbol_count_,
- this->values_,
- this->symbols_,
- (*pviews)[index].view,
- (*pviews)[index].address,
- (*pviews)[index].view_size);
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::free_input_to_output_maps()
+{
+ const unsigned int loccount = this->local_symbol_count_;
+ for (unsigned int i = 1; i < loccount; ++i)
+ {
+ Symbol_value<size>& lv(this->local_values_[i]);
+ lv.free_input_to_output_map();
}
}
-// Instantiate the templates we need. We could use the configure
-// script to restrict this to only the ones for implemented targets.
+// Class Merged_symbol_value.
+template<int size>
+void
+Merged_symbol_value<size>::initialize_input_to_output_map(
+ const Relobj* object,
+ unsigned int input_shndx)
+{
+ Object_merge_map* map = object->merge_map();
+ map->initialize_input_to_output_map<size>(input_shndx,
+ this->output_start_address_,
+ &this->output_addresses_);
+}
+
+// Get the output value corresponding to an input offset if we
+// couldn't find it in the hash table.
+
+template<int size>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Merged_symbol_value<size>::value_from_output_section(
+ const Relobj* object,
+ unsigned int input_shndx,
+ typename elfcpp::Elf_types<size>::Elf_Addr input_offset) const
+{
+ section_offset_type output_offset;
+ bool found = object->merge_map()->get_output_offset(NULL, input_shndx,
+ input_offset,
+ &output_offset);
+
+ // If this assertion fails, it means that some relocation was
+ // against a portion of an input merge section which we didn't map
+ // to the output file and we didn't explicitly discard. We should
+ // always map all portions of input merge sections.
+ gold_assert(found);
+
+ if (output_offset == -1)
+ return 0;
+ else
+ return this->output_start_address_ + output_offset;
+}
+
+// Track_relocs methods.
+
+// Initialize the class to track the relocs. This gets the object,
+// the reloc section index, and the type of the relocs. This returns
+// false if something goes wrong.
+
+template<int size, bool big_endian>
+bool
+Track_relocs<size, big_endian>::initialize(
+ Object* object,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type)
+{
+ // If RELOC_SHNDX is -1U, it means there is more than one reloc
+ // section for the .eh_frame section. We can't handle that case.
+ if (reloc_shndx == -1U)
+ return false;
+
+ // If RELOC_SHNDX is 0, there is no reloc section.
+ if (reloc_shndx == 0)
+ return true;
+
+ // Get the contents of the reloc section.
+ this->prelocs_ = object->section_contents(reloc_shndx, &this->len_, false);
+
+ if (reloc_type == elfcpp::SHT_REL)
+ this->reloc_size_ = elfcpp::Elf_sizes<size>::rel_size;
+ else if (reloc_type == elfcpp::SHT_RELA)
+ this->reloc_size_ = elfcpp::Elf_sizes<size>::rela_size;
+ else
+ gold_unreachable();
+
+ if (this->len_ % this->reloc_size_ != 0)
+ {
+ object->error(_("reloc section size %zu is not a multiple of "
+ "reloc size %d\n"),
+ static_cast<size_t>(this->len_),
+ this->reloc_size_);
+ return false;
+ }
+
+ return true;
+}
+
+// Return the offset of the next reloc, or -1 if there isn't one.
+
+template<int size, bool big_endian>
+off_t
+Track_relocs<size, big_endian>::next_offset() const
+{
+ if (this->pos_ >= this->len_)
+ return -1;
+
+ // Rel and Rela start out the same, so we can always use Rel to find
+ // the r_offset value.
+ elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
+ return rel.get_r_offset();
+}
+
+// Return the index of the symbol referenced by the next reloc, or -1U
+// if there aren't any more relocs.
+
+template<int size, bool big_endian>
+unsigned int
+Track_relocs<size, big_endian>::next_symndx() const
+{
+ if (this->pos_ >= this->len_)
+ return -1U;
+
+ // Rel and Rela start out the same, so we can use Rel to find the
+ // symbol index.
+ elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
+ return elfcpp::elf_r_sym<size>(rel.get_r_info());
+}
+
+// Advance to the next reloc whose r_offset is greater than or equal
+// to OFFSET. Return the number of relocs we skip.
+
+template<int size, bool big_endian>
+int
+Track_relocs<size, big_endian>::advance(off_t offset)
+{
+ int ret = 0;
+ while (this->pos_ < this->len_)
+ {
+ // Rel and Rela start out the same, so we can always use Rel to
+ // find the r_offset value.
+ elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
+ if (static_cast<off_t>(rel.get_r_offset()) >= offset)
+ break;
+ ++ret;
+ this->pos_ += this->reloc_size_;
+ }
+ return ret;
+}
+
+// Instantiate the templates we need.
+
+#ifdef HAVE_TARGET_32_LITTLE
template
void
-Sized_object<32, false>::do_relocate(const General_options& options,
+Sized_relobj<32, false>::do_read_relocs(Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Sized_relobj<32, true>::do_read_relocs(Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Sized_relobj<64, false>::do_read_relocs(Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Sized_relobj<64, true>::do_read_relocs(Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Sized_relobj<32, false>::do_scan_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Sized_relobj<32, true>::do_scan_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Sized_relobj<64, false>::do_scan_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Sized_relobj<64, true>::do_scan_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Sized_relobj<32, false>::do_relocate(const General_options& options,
const Symbol_table* symtab,
- const Stringpool* sympool,
+ const Layout* layout,
Output_file* of);
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
void
-Sized_object<32, true>::do_relocate(const General_options& options,
+Sized_relobj<32, true>::do_relocate(const General_options& options,
const Symbol_table* symtab,
- const Stringpool* sympool,
+ const Layout* layout,
Output_file* of);
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
void
-Sized_object<64, false>::do_relocate(const General_options& options,
+Sized_relobj<64, false>::do_relocate(const General_options& options,
const Symbol_table* symtab,
- const Stringpool* sympool,
+ const Layout* layout,
Output_file* of);
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
void
-Sized_object<64, true>::do_relocate(const General_options& options,
+Sized_relobj<64, true>::do_relocate(const General_options& options,
const Symbol_table* symtab,
- const Stringpool* sympool,
+ const Layout* layout,
Output_file* of);
+#endif
+
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+class Merged_symbol_value<32>;
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+class Merged_symbol_value<64>;
+#endif
+
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+class Symbol_value<32>;
+#endif
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+class Symbol_value<64>;
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+class Track_relocs<32, false>;
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+class Track_relocs<32, true>;
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+class Track_relocs<64, false>;
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+class Track_relocs<64, true>;
+#endif
} // End namespace gold.