// reloc.cc -- relocate input files for gold.
+// Copyright (C) 2006-2021 Free Software Foundation, Inc.
+
+// 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 "layout.h"
#include "symtab.h"
#include "output.h"
+#include "merge.h"
+#include "object.h"
+#include "target-reloc.h"
#include "reloc.h"
+#include "icf.h"
+#include "compressed_output.h"
+#include "incremental.h"
namespace gold
{
// After reading it, the start another task to process the
// information. These tasks requires access to the file.
-Task::Is_runnable_type
-Read_relocs::is_runnable(Workqueue*)
+Task_token*
+Read_relocs::is_runnable()
{
- return this->object_->is_locked() ? IS_LOCKED : IS_RUNNABLE;
+ return this->object_->is_locked() ? this->object_->token() : NULL;
}
// Lock the file.
-Task_locker*
-Read_relocs::locks(Workqueue*)
+void
+Read_relocs::locks(Task_locker* tl)
{
- return new Task_locker_obj<Object>(*this->object_);
+ Task_token* token = this->object_->token();
+ if (token != NULL)
+ tl->add(this, 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;
+ Read_relocs_data* rd = new Read_relocs_data;
this->object_->read_relocs(rd);
- workqueue->queue_front(new Scan_relocs(this->options_, this->symtab_,
- this->layout_, this->object_, rd,
- this->symtab_lock_, this->blocker_));
+ this->object_->set_relocs_data(rd);
+ this->object_->release();
+
+ // If garbage collection or identical comdat folding is desired, we
+ // process the relocs first before scanning them. Scanning of relocs is
+ // done only after garbage or identical sections is identified.
+ if (parameters->options().gc_sections()
+ || parameters->options().icf_enabled())
+ {
+ workqueue->queue_next(new Gc_process_relocs(this->symtab_,
+ this->layout_,
+ this->object_, rd,
+ this->this_blocker_,
+ this->next_blocker_));
+ }
+ else
+ {
+ workqueue->queue_next(new Scan_relocs(this->symtab_, this->layout_,
+ this->object_, rd,
+ this->this_blocker_,
+ this->next_blocker_));
+ }
+}
+
+// Return a debugging name for the task.
+
+std::string
+Read_relocs::get_name() const
+{
+ return "Read_relocs " + this->object_->name();
+}
+
+// Gc_process_relocs methods.
+
+Gc_process_relocs::~Gc_process_relocs()
+{
+ if (this->this_blocker_ != NULL)
+ delete this->this_blocker_;
+}
+
+// These tasks process the relocations read by Read_relocs and
+// determine which sections are referenced and which are garbage.
+// This task is done only when --gc-sections is used. This is blocked
+// by THIS_BLOCKER_. It unblocks NEXT_BLOCKER_.
+
+Task_token*
+Gc_process_relocs::is_runnable()
+{
+ if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
+ return this->this_blocker_;
+ if (this->object_->is_locked())
+ return this->object_->token();
+ return NULL;
+}
+
+void
+Gc_process_relocs::locks(Task_locker* tl)
+{
+ tl->add(this, this->object_->token());
+ tl->add(this, this->next_blocker_);
+}
+
+void
+Gc_process_relocs::run(Workqueue*)
+{
+ this->object_->gc_process_relocs(this->symtab_, this->layout_, this->rd_);
+ this->object_->release();
+}
+
+// Return a debugging name for the task.
+
+std::string
+Gc_process_relocs::get_name() const
+{
+ return "Gc_process_relocs " + this->object_->name();
}
// Scan_relocs methods.
+Scan_relocs::~Scan_relocs()
+{
+ if (this->this_blocker_ != NULL)
+ delete this->this_blocker_;
+}
+
// 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::Is_runnable_type
-Scan_relocs::is_runnable(Workqueue*)
+Task_token*
+Scan_relocs::is_runnable()
{
- if (!this->symtab_lock_->is_writable() || this->object_->is_locked())
- return IS_LOCKED;
- return IS_RUNNABLE;
+ if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
+ return this->this_blocker_;
+ 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.
-class Scan_relocs::Scan_relocs_locker : public Task_locker
-{
- public:
- Scan_relocs_locker(Object* object, Task_token& symtab_lock, Task* task,
- Task_token& blocker, Workqueue* workqueue)
- : objlock_(*object), symtab_locker_(symtab_lock, task),
- blocker_(blocker, workqueue)
- { }
-
- private:
- Task_locker_obj<Object> objlock_;
- Task_locker_write symtab_locker_;
- Task_locker_block blocker_;
-};
-
-Task_locker*
-Scan_relocs::locks(Workqueue* workqueue)
+void
+Scan_relocs::locks(Task_locker* tl)
{
- return new Scan_relocs_locker(this->object_, *this->symtab_lock_, this,
- *this->blocker_, workqueue);
+ Task_token* token = this->object_->token();
+ if (token != NULL)
+ tl->add(this, token);
+ tl->add(this, this->next_blocker_);
}
// Scan the relocs.
void
Scan_relocs::run(Workqueue*)
{
- this->object_->scan_relocs(this->options_, this->symtab_, this->layout_,
- this->rd_);
+ this->object_->scan_relocs(this->symtab_, this->layout_, this->rd_);
delete this->rd_;
this->rd_ = NULL;
+ this->object_->release();
}
-// Relocate_task methods.
-
-// These tasks are always runnable.
+// Return a debugging name for the task.
-Task::Is_runnable_type
-Relocate_task::is_runnable(Workqueue*)
+std::string
+Scan_relocs::get_name() const
{
- return IS_RUNNABLE;
+ return "Scan_relocs " + this->object_->name();
}
-// We want to lock the file while we run. We want to unblock
-// FINAL_BLOCKER when we are done.
+// Relocate_task methods.
+
+// We may have to wait for the output sections to be written.
-class Relocate_task::Relocate_locker : public Task_locker
+Task_token*
+Relocate_task::is_runnable()
{
- public:
- Relocate_locker(Task_token& token, Workqueue* workqueue,
- Object* object)
- : blocker_(token, workqueue), objlock_(*object)
- { }
+ if (this->object_->relocs_must_follow_section_writes()
+ && this->output_sections_blocker_->is_blocked())
+ return this->output_sections_blocker_;
- private:
- Task_locker_block blocker_;
- Task_locker_obj<Object> objlock_;
-};
+ if (this->object_->is_locked())
+ return this->object_->token();
+
+ return NULL;
+}
+
+// We want to lock the file while we run. We want to unblock
+// INPUT_SECTIONS_BLOCKER and FINAL_BLOCKER when we are done.
+// INPUT_SECTIONS_BLOCKER may be NULL.
-Task_locker*
-Relocate_task::locks(Workqueue* workqueue)
+void
+Relocate_task::locks(Task_locker* tl)
{
- return new Relocate_locker(*this->final_blocker_, workqueue,
- this->object_);
+ if (this->input_sections_blocker_ != NULL)
+ tl->add(this, this->input_sections_blocker_);
+ tl->add(this, this->final_blocker_);
+ Task_token* token = this->object_->token();
+ if (token != NULL)
+ tl->add(this, token);
}
// Run the task.
void
Relocate_task::run(Workqueue*)
{
- this->object_->relocate(this->options_, this->symtab_, this->layout_,
- this->of_);
+ this->object_->relocate(this->symtab_, this->layout_, this->of_);
+
+ // 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
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
+Sized_relobj_file<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
{
rd->relocs.clear();
rd->relocs.reserve(shnum / 2);
- const unsigned char *pshdrs = this->get_view(this->elf_file_.shoff(),
- shnum * This::shdr_size);
+ 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;
+ 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);
if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
continue;
- unsigned int shndx = shdr.get_sh_info();
+ unsigned int shndx = this->adjust_shndx(shdr.get_sh_info());
if (shndx >= shnum)
{
- fprintf(stderr, _("%s: %s: relocation section %u has bad info %u\n"),
- program_name, this->name().c_str(), i, shndx);
- gold_exit(false);
+ this->error(_("relocation section %u has bad info %u"),
+ i, shndx);
+ continue;
}
- if (!this->is_section_included(shndx))
+ 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.
+ // GOT and PLT entries. So we skip them unless this is a
+ // relocatable link or we need to emit relocations. FIXME: What
+ // should we do if a linker script maps a section with SHF_ALLOC
+ // clear to a section with SHF_ALLOC set?
typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size);
- if ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+ bool is_section_allocated = ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC)
+ != 0);
+ if (!is_section_allocated
+ && !parameters->options().relocatable()
+ && !parameters->options().emit_relocs()
+ && !parameters->incremental())
continue;
- if (shdr.get_sh_link() != this->symtab_shndx_)
+ 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);
+ 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();
+ if (sh_size == 0)
+ continue;
+
unsigned int reloc_size;
if (sh_type == elfcpp::SHT_REL)
reloc_size = elfcpp::Elf_sizes<size>::rel_size;
reloc_size = elfcpp::Elf_sizes<size>::rela_size;
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);
+ 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 (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);
+ 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);
+ 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(loccount == symtabshdr.get_sh_info());
off_t locsize = loccount * sym_size;
rd->local_symbols = this->get_lasting_view(symtabshdr.get_sh_offset(),
- locsize);
+ locsize, true, true);
}
}
+// Process the relocs to generate mappings from source sections to referenced
+// sections. This is used during garbage collection to determine garbage
+// sections.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::do_gc_process_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd)
+{
+ Sized_target<size, big_endian>* target =
+ parameters->sized_target<size, big_endian>();
+
+ 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->gc_process_relocs(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);
+ }
+ }
+}
+
+
// 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_relobj_file<size, big_endian>::do_scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd)
{
- Sized_target<size, big_endian>* target = this->sized_target();
+ Sized_target<size, big_endian>* target =
+ parameters->sized_target<size, big_endian>();
const unsigned char* local_symbols;
if (rd->local_symbols == NULL)
else
local_symbols = rd->local_symbols->data();
+ // For incremental links, allocate the counters for incremental relocations.
+ if (layout->incremental_inputs() != NULL)
+ this->allocate_incremental_reloc_counts();
+
for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
p != rd->relocs.end();
++p)
{
- target->scan_relocs(options, symtab, layout, this, p->data_shndx,
- p->sh_type, p->contents->data(), p->reloc_count,
- this->local_symbol_count_,
- local_symbols,
- this->symbols_);
+ // When garbage collection is on, unreferenced sections are not included
+ // in the link that would have been included normally. This is known only
+ // after Read_relocs hence this check has to be done again.
+ if (parameters->options().gc_sections()
+ || parameters->options().icf_enabled())
+ {
+ if (p->output_section == NULL)
+ continue;
+ }
+ 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(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(symtab, layout, local_symbols, p);
+ if (layout->incremental_inputs() != NULL)
+ this->incremental_relocs_scan(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(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;
}
+ // For incremental links, finalize the allocation of relocations.
+ if (layout->incremental_inputs() != NULL)
+ this->finalize_incremental_relocs(layout, true);
+
if (rd->local_symbols != NULL)
{
delete rd->local_symbols;
}
}
+// Scan the input relocations for --emit-relocs.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::emit_relocs_scan(
+ Symbol_table* symtab,
+ Layout* layout,
+ const unsigned char* plocal_syms,
+ const Read_relocs_data::Relocs_list::iterator& p)
+{
+ Sized_target<size, big_endian>* target =
+ parameters->sized_target<size, big_endian>();
+
+ Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
+ gold_assert(rr != NULL);
+ rr->set_reloc_count(p->reloc_count);
+ target->emit_relocs_scan(
+ 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_,
+ plocal_syms,
+ rr);
+}
+
+// Scan the input relocations for --incremental.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::incremental_relocs_scan(
+ const Read_relocs_data::Relocs_list::iterator& p)
+{
+ if (p->sh_type == elfcpp::SHT_REL)
+ this->incremental_relocs_scan_reltype<elfcpp::SHT_REL>(p);
+ else
+ {
+ gold_assert(p->sh_type == elfcpp::SHT_RELA);
+ this->incremental_relocs_scan_reltype<elfcpp::SHT_RELA>(p);
+ }
+}
+
+// Scan the input relocation for --incremental, templatized on the
+// type of the relocation section.
+
+template<int size, bool big_endian>
+template<int sh_type>
+void
+Sized_relobj_file<size, big_endian>::incremental_relocs_scan_reltype(
+ const Read_relocs_data::Relocs_list::iterator& p)
+{
+ typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
+ const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
+ const unsigned char* prelocs = p->contents->data();
+ size_t reloc_count = p->reloc_count;
+
+ for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
+ {
+ Reltype reloc(prelocs);
+
+ if (p->needs_special_offset_handling
+ && !p->output_section->is_input_address_mapped(this, p->data_shndx,
+ reloc.get_r_offset()))
+ continue;
+
+ // FIXME: Some targets have a non-standard r_info field.
+ typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
+ const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
+
+ if (r_sym >= this->local_symbol_count_)
+ this->count_incremental_reloc(r_sym - this->local_symbol_count_);
+ }
+}
+
// Relocate the input sections and write out the local symbols.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::do_relocate(const General_options& options,
- const Symbol_table* symtab,
- const Layout* layout,
- Output_file* of)
+Sized_relobj_file<size, big_endian>::do_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of)
{
unsigned int shnum = this->shnum();
// Read the section headers.
const unsigned char* pshdrs = this->get_view(this->elf_file_.shoff(),
- shnum * This::shdr_size);
+ shnum * This::shdr_size,
+ true, true);
Views views;
views.resize(shnum);
// section data to the output file. The second one applies
// relocations.
- this->write_sections(pshdrs, of, &views);
+ this->write_sections(layout, 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();
+
+ // Make the views available through get_output_view() for the duration
+ // of this routine. This RAII class will reset output_views_ to NULL
+ // when the views go out of scope.
+ struct Set_output_views
+ {
+ Set_output_views(const Views** ppviews, const Views* pviews)
+ {
+ ppviews_ = ppviews;
+ *ppviews = pviews;
+ }
+
+ ~Set_output_views()
+ { *ppviews_ = NULL; }
+
+ const Views** ppviews_;
+ };
+ Set_output_views set_output_views(&this->output_views_, &views);
// Apply relocations.
- this->relocate_sections(options, symtab, layout, pshdrs, &views);
+ this->relocate_sections(symtab, layout, pshdrs, of, &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_ctors_reverse_view)
+ this->reverse_words(views[i].view, views[i].view_size);
+ 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, layout->sympool());
+ this->write_local_symbols(of, layout->sympool(), layout->dynpool(),
+ layout->symtab_xindex(), layout->dynsym_xindex(),
+ layout->symtab_section_offset());
}
+// 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_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
- Output_file* of,
- Views* pviews)
+Sized_relobj_file<size, big_endian>::write_sections(const Layout* layout,
+ 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;
- if (map_sections[i].offset == -1)
- continue;
-
- 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;
- 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;
+ pvs->is_ctors_reverse_view = false;
- if (sh_size == 0)
+ 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;
+ bool must_decompress = false;
+ if (output_offset != invalid_address)
+ {
+ view_start = output_section_offset + output_offset;
+ view_size = convert_to_section_size_type(shdr.get_sh_size());
+ section_size_type uncompressed_size;
+ if (this->section_is_compressed(i, &uncompressed_size))
+ {
+ view_size = uncompressed_size;
+ must_decompress = true;
+ }
+ }
+ else
+ {
+ view_start = output_section_offset;
+ view_size = convert_to_section_size_type(output_section_size);
+ }
+
+ if (view_size == 0)
continue;
- gold_assert(map_sections[i].offset >= 0
- && map_sections[i].offset + sh_size <= os->data_size());
+ gold_assert(output_offset == invalid_address
+ || output_offset + view_size <= output_section_size);
- unsigned char* view = of->get_output_view(start, sh_size);
- this->read(shdr.get_sh_offset(), sh_size, view);
+ unsigned char* view;
+ if (os->requires_postprocessing())
+ {
+ unsigned char* buffer = os->postprocessing_buffer();
+ view = buffer + view_start;
+ if (output_offset != invalid_address && !must_decompress)
+ {
+ 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);
+ if (!must_decompress)
+ {
+ 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));
+ }
+ }
+ }
+
+ if (must_decompress)
+ {
+ // Read and decompress the section.
+ section_size_type len;
+ const unsigned char* p = this->section_contents(i, &len, false);
+ if (!decompress_input_section(p, len, view, view_size,
+ size, big_endian,
+ shdr.get_sh_flags()))
+ this->error(_("could not decompress section %s"),
+ this->section_name(i).c_str());
+ }
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();
+ pvs->is_ctors_reverse_view =
+ (!parameters->options().relocatable()
+ && view_size > size / 8
+ && (strcmp(os->name(), ".init_array") == 0
+ || strcmp(os->name(), ".fini_array") == 0)
+ && layout->is_ctors_in_init_array(this, i));
+ }
+
+ // 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_relobj<size, big_endian>::relocate_sections(
- const General_options& options,
+Sized_relobj_file<size, big_endian>::do_relocate_sections(
const Symbol_table* symtab,
const Layout* layout,
const unsigned char* pshdrs,
+ Output_file* of,
Views* pviews)
{
- unsigned int shnum = this->shnum();
- Sized_target<size, big_endian>* target = this->sized_target();
+ this->relocate_section_range(symtab, layout, pshdrs, of, pviews,
+ 1, this->shnum() - 1);
+}
+
+// Relocate section data for the range of sections START_SHNDX through
+// END_SHNDX.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::relocate_section_range(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews,
+ unsigned int start_shndx,
+ unsigned int end_shndx)
+{
+ gold_assert(start_shndx >= 1);
+ gold_assert(end_shndx < this->shnum());
+
+ if (end_shndx < start_shndx)
+ return;
+
+ Sized_target<size, big_endian>* target =
+ parameters->sized_target<size, big_endian>();
+
+ 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;
- relinfo.local_symbol_count = this->local_symbol_count_;
- relinfo.local_values = &this->local_values_;
- relinfo.symbols = this->symbols_;
- const unsigned char* p = pshdrs + This::shdr_size;
- for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
+ const unsigned char* p = pshdrs + start_shndx * This::shdr_size;
+ for (unsigned int i = start_shndx; i <= end_shndx; ++i, p += This::shdr_size)
{
typename This::Shdr shdr(p);
if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
continue;
- unsigned int index = shdr.get_sh_info();
+ off_t sh_size = shdr.get_sh_size();
+ if (sh_size == 0)
+ continue;
+
+ 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 (!this->is_section_included(index))
+ 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];
gold_assert((*pviews)[index].view != NULL);
+ if (parameters->options().relocatable())
+ gold_assert((*pviews)[i].view != NULL);
- if (shdr.get_sh_link() != this->symtab_shndx_)
+ 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.reloc_shdr = p;
relinfo.data_shndx = index;
- target->relocate_section(&relinfo,
- sh_type,
- prelocs,
- reloc_count,
- (*pviews)[index].view,
- (*pviews)[index].address,
- (*pviews)[index].view_size);
+ relinfo.data_shdr = pshdrs + index * This::shdr_size;
+ unsigned char* view = (*pviews)[index].view;
+ Address address = (*pviews)[index].address;
+ section_size_type view_size = (*pviews)[index].view_size;
+
+ Reloc_symbol_changes* reloc_map = NULL;
+ if (this->uses_split_stack() && output_offset != invalid_address)
+ {
+ typename This::Shdr data_shdr(pshdrs + index * This::shdr_size);
+ if ((data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0)
+ this->split_stack_adjust(symtab, pshdrs, sh_type, index,
+ prelocs, reloc_count, view, view_size,
+ &reloc_map, target);
+ }
+
+ Relocatable_relocs* rr = NULL;
+ if (parameters->options().emit_relocs()
+ || parameters->options().relocatable())
+ rr = this->relocatable_relocs(i);
+ relinfo.rr = rr;
+
+ if (!parameters->options().relocatable())
+ {
+ target->relocate_section(&relinfo, sh_type, prelocs, reloc_count, os,
+ output_offset == invalid_address,
+ view, address, view_size, reloc_map);
+ if (parameters->options().emit_relocs())
+ target->relocate_relocs(&relinfo, sh_type, prelocs, reloc_count,
+ os, output_offset,
+ view, address, view_size,
+ (*pviews)[i].view,
+ (*pviews)[i].view_size);
+ if (parameters->incremental())
+ this->incremental_relocs_write(&relinfo, sh_type, prelocs,
+ reloc_count, os, output_offset, of);
+ }
+ else
+ target->relocate_relocs(&relinfo, sh_type, prelocs, reloc_count,
+ os, output_offset,
+ view, address, view_size,
+ (*pviews)[i].view,
+ (*pviews)[i].view_size);
}
}
-// Copy_relocs::Copy_reloc_entry methods.
+// Return the output view for section SHNDX.
-// Return whether we should emit this reloc. We should emit it if the
-// symbol is still defined in a dynamic object. If we should not emit
-// it, we clear it, to save ourselves the test next time.
+template<int size, bool big_endian>
+unsigned char*
+Sized_relobj_file<size, big_endian>::do_get_output_view(
+ unsigned int shndx,
+ section_size_type* plen) const
+{
+ gold_assert(this->output_views_ != NULL);
+ gold_assert(shndx < this->output_views_->size());
+ const View_size& v = (*this->output_views_)[shndx];
+ *plen = v.view_size;
+ return v.view;
+}
+
+// Write the incremental relocs.
template<int size, bool big_endian>
-bool
-Copy_relocs<size, big_endian>::Copy_reloc_entry::should_emit()
+void
+Sized_relobj_file<size, big_endian>::incremental_relocs_write(
+ const Relocate_info<size, big_endian>* relinfo,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ Address output_offset,
+ Output_file* of)
{
- if (this->sym_ == NULL)
- return false;
- if (this->sym_->is_from_dynobj())
- return true;
- this->sym_ = NULL;
- return false;
+ if (sh_type == elfcpp::SHT_REL)
+ this->incremental_relocs_write_reltype<elfcpp::SHT_REL>(
+ relinfo,
+ prelocs,
+ reloc_count,
+ output_section,
+ output_offset,
+ of);
+ else
+ {
+ gold_assert(sh_type == elfcpp::SHT_RELA);
+ this->incremental_relocs_write_reltype<elfcpp::SHT_RELA>(
+ relinfo,
+ prelocs,
+ reloc_count,
+ output_section,
+ output_offset,
+ of);
+ }
+}
+
+// Write the incremental relocs, templatized on the type of the
+// relocation section.
+
+template<int size, bool big_endian>
+template<int sh_type>
+void
+Sized_relobj_file<size, big_endian>::incremental_relocs_write_reltype(
+ const Relocate_info<size, big_endian>* relinfo,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ Address output_offset,
+ Output_file* of)
+{
+ typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reloc;
+ const unsigned int reloc_size =
+ Reloc_types<sh_type, size, big_endian>::reloc_size;
+ const unsigned int sizeof_addr = size / 8;
+ const unsigned int incr_reloc_size =
+ Incremental_relocs_reader<size, big_endian>::reloc_size;
+
+ unsigned int out_shndx = output_section->out_shndx();
+
+ // Get a view for the .gnu_incremental_relocs section.
+
+ Incremental_inputs* inputs = relinfo->layout->incremental_inputs();
+ gold_assert(inputs != NULL);
+ const off_t relocs_off = inputs->relocs_section()->offset();
+ const off_t relocs_size = inputs->relocs_section()->data_size();
+ unsigned char* const view = of->get_output_view(relocs_off, relocs_size);
+
+ for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
+ {
+ Reloc reloc(prelocs);
+
+ // FIXME: Some targets have a non-standard r_info field.
+ typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
+ const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
+ const unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
+
+ if (r_sym < this->local_symbol_count_)
+ continue;
+
+ // Get the new offset--the location in the output section where
+ // this relocation should be applied.
+
+ Address offset = reloc.get_r_offset();
+ if (output_offset != invalid_address)
+ offset += output_offset;
+ else
+ {
+ section_offset_type sot_offset =
+ convert_types<section_offset_type, Address>(offset);
+ section_offset_type new_sot_offset =
+ output_section->output_offset(relinfo->object,
+ relinfo->data_shndx,
+ sot_offset);
+ gold_assert(new_sot_offset != -1);
+ offset += new_sot_offset;
+ }
+
+ // Get the addend.
+ typename elfcpp::Elf_types<size>::Elf_Swxword addend;
+ if (sh_type == elfcpp::SHT_RELA)
+ addend =
+ Reloc_types<sh_type, size, big_endian>::get_reloc_addend(&reloc);
+ else
+ {
+ // FIXME: Get the addend for SHT_REL.
+ addend = 0;
+ }
+
+ // Get the index of the output relocation.
+
+ unsigned int reloc_index =
+ this->next_incremental_reloc_index(r_sym - this->local_symbol_count_);
+
+ // Write the relocation.
+
+ unsigned char* pov = view + reloc_index * incr_reloc_size;
+ elfcpp::Swap<32, big_endian>::writeval(pov, r_type);
+ elfcpp::Swap<32, big_endian>::writeval(pov + 4, out_shndx);
+ elfcpp::Swap<size, big_endian>::writeval(pov + 8, offset);
+ elfcpp::Swap<size, big_endian>::writeval(pov + 8 + sizeof_addr, addend);
+ of->write_output_view(pov - view, incr_reloc_size, view);
+ }
}
-// Emit a reloc into a SHT_REL section.
+// Create merge hash tables for the local symbols. These are used to
+// speed up relocations.
template<int size, bool big_endian>
void
-Copy_relocs<size, big_endian>::Copy_reloc_entry::emit(
- Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian>* reloc_data)
+Sized_relobj_file<size, big_endian>::initialize_input_to_output_maps()
{
- this->sym_->set_needs_dynsym_entry();
- reloc_data->add_global(this->sym_, this->reloc_type_, this->relobj_,
- this->shndx_, this->address_);
+ 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);
+ }
}
-// Emit a reloc into a SHT_RELA section.
+// Free merge hash tables for the local symbols.
template<int size, bool big_endian>
void
-Copy_relocs<size, big_endian>::Copy_reloc_entry::emit(
- Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>* reloc_data)
+Sized_relobj_file<size, big_endian>::free_input_to_output_maps()
{
- this->sym_->set_needs_dynsym_entry();
- reloc_data->add_global(this->sym_, this->reloc_type_, this->relobj_,
- this->shndx_, this->address_, this->addend_);
+ 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();
+ }
}
-// Copy_relocs methods.
+// If an object was compiled with -fsplit-stack, this is called to
+// check whether any relocations refer to functions defined in objects
+// which were not compiled with -fsplit-stack. If they were, then we
+// need to apply some target-specific adjustments to request
+// additional stack space.
-// Return whether we need a COPY reloc for a relocation against GSYM.
-// The relocation is being applied to section SHNDX in OBJECT.
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::split_stack_adjust(
+ const Symbol_table* symtab,
+ const unsigned char* pshdrs,
+ unsigned int sh_type,
+ unsigned int shndx,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ unsigned char* view,
+ section_size_type view_size,
+ Reloc_symbol_changes** reloc_map,
+ const Sized_target<size, big_endian>* target)
+{
+ if (sh_type == elfcpp::SHT_REL)
+ this->split_stack_adjust_reltype<elfcpp::SHT_REL>(symtab, pshdrs, shndx,
+ prelocs, reloc_count,
+ view, view_size,
+ reloc_map, target);
+ else
+ {
+ gold_assert(sh_type == elfcpp::SHT_RELA);
+ this->split_stack_adjust_reltype<elfcpp::SHT_RELA>(symtab, pshdrs, shndx,
+ prelocs, reloc_count,
+ view, view_size,
+ reloc_map, target);
+ }
+}
+
+// Adjust for -fsplit-stack, templatized on the type of the relocation
+// section.
template<int size, bool big_endian>
-bool
-Copy_relocs<size, big_endian>::need_copy_reloc(
- const General_options*,
- Relobj* object,
+template<int sh_type>
+void
+Sized_relobj_file<size, big_endian>::split_stack_adjust_reltype(
+ const Symbol_table* symtab,
+ const unsigned char* pshdrs,
unsigned int shndx,
- Sized_symbol<size>* sym)
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ unsigned char* view,
+ section_size_type view_size,
+ Reloc_symbol_changes** reloc_map,
+ const Sized_target<size, big_endian>* target)
{
- // FIXME: Handle -z nocopyrelocs.
+ typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
+ const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
- if (sym->symsize() == 0)
- return false;
+ size_t local_count = this->local_symbol_count();
- // If this is a readonly section, then we need a COPY reloc.
- // Otherwise we can use a dynamic reloc.
- if ((object->section_flags(shndx) & elfcpp::SHF_WRITE) == 0)
- return true;
+ std::vector<section_offset_type> non_split_refs;
+
+ const unsigned char* pr = prelocs;
+ for (size_t i = 0; i < reloc_count; ++i, pr += reloc_size)
+ {
+ // Some supported targets have a non-standard r_info field.
+ // If this call is too slow, we can move this routine to
+ // target-reloc.h and templatize it on Classify_reloc.
+ unsigned int r_sym = target->get_r_sym(pr);
+ if (r_sym < local_count)
+ continue;
+
+ const Symbol* gsym = this->global_symbol(r_sym);
+ gold_assert(gsym != NULL);
+ if (gsym->is_forwarder())
+ gsym = symtab->resolve_forwards(gsym);
+
+ // See if this relocation refers to a function defined in an
+ // object compiled without -fsplit-stack. Note that we don't
+ // care about the type of relocation--this means that in some
+ // cases we will ask for a large stack unnecessarily, but this
+ // is not fatal. FIXME: Some targets have symbols which are
+ // functions but are not type STT_FUNC, e.g., STT_ARM_TFUNC.
+ if (!gsym->is_undefined()
+ && gsym->source() == Symbol::FROM_OBJECT
+ && !gsym->object()->uses_split_stack())
+ {
+ if (parameters->target().is_call_to_non_split(gsym, pr, view,
+ view_size))
+ {
+ Reltype reloc(pr);
+ section_offset_type offset =
+ convert_to_section_size_type(reloc.get_r_offset());
+ non_split_refs.push_back(offset);
+ }
+ }
+ }
+
+ if (non_split_refs.empty())
+ return;
- return false;
+ // At this point, every entry in NON_SPLIT_REFS indicates a
+ // relocation which refers to a function in an object compiled
+ // without -fsplit-stack. We now have to convert that list into a
+ // set of offsets to functions. First, we find all the functions.
+
+ Function_offsets function_offsets;
+ this->find_functions(pshdrs, shndx, &function_offsets);
+ if (function_offsets.empty())
+ return;
+
+ // Now get a list of the function with references to non split-stack
+ // code.
+
+ Function_offsets calls_non_split;
+ for (std::vector<section_offset_type>::const_iterator p
+ = non_split_refs.begin();
+ p != non_split_refs.end();
+ ++p)
+ {
+ Function_offsets::const_iterator low = function_offsets.lower_bound(*p);
+ if (low == function_offsets.end())
+ --low;
+ else if (low->first == *p)
+ ;
+ else if (low == function_offsets.begin())
+ continue;
+ else
+ --low;
+
+ calls_non_split.insert(*low);
+ }
+ if (calls_non_split.empty())
+ return;
+
+ // Now we have a set of functions to adjust. The adjustments are
+ // target specific. Besides changing the output section view
+ // however, it likes, the target may request a relocation change
+ // from one global symbol name to another.
+
+ for (Function_offsets::const_iterator p = calls_non_split.begin();
+ p != calls_non_split.end();
+ ++p)
+ {
+ std::string from;
+ std::string to;
+ parameters->target().calls_non_split(this, shndx, p->first, p->second,
+ prelocs, reloc_count,
+ view, view_size, &from, &to);
+ if (!from.empty())
+ {
+ gold_assert(!to.empty());
+ Symbol* tosym = NULL;
+
+ // Find relocations in the relevant function which are for
+ // FROM.
+ pr = prelocs;
+ for (size_t i = 0; i < reloc_count; ++i, pr += reloc_size)
+ {
+ Reltype reloc(pr);
+
+ unsigned int r_sym = target->get_r_sym(pr);
+ if (r_sym < local_count)
+ continue;
+
+ section_offset_type offset =
+ convert_to_section_size_type(reloc.get_r_offset());
+ if (offset < p->first
+ || (offset
+ >= (p->first
+ + static_cast<section_offset_type>(p->second))))
+ continue;
+
+ const Symbol* gsym = this->global_symbol(r_sym);
+ if (from == gsym->name())
+ {
+ if (tosym == NULL)
+ {
+ tosym = symtab->lookup(to.c_str());
+ if (tosym == NULL)
+ {
+ this->error(_("could not convert call "
+ "to '%s' to '%s'"),
+ from.c_str(), to.c_str());
+ break;
+ }
+ }
+
+ if (*reloc_map == NULL)
+ *reloc_map = new Reloc_symbol_changes(reloc_count);
+ (*reloc_map)->set(i, tosym);
+ }
+ }
+ }
+ }
}
-// Save a Rel reloc.
+// Find all the function in this object defined in section SHNDX.
+// Store their offsets in the section in FUNCTION_OFFSETS.
template<int size, bool big_endian>
void
-Copy_relocs<size, big_endian>::save(
- Symbol* sym,
- Relobj* relobj,
+Sized_relobj_file<size, big_endian>::find_functions(
+ const unsigned char* pshdrs,
unsigned int shndx,
- const elfcpp::Rel<size, big_endian>& rel)
+ Sized_relobj_file<size, big_endian>::Function_offsets* function_offsets)
{
- unsigned int reloc_type = elfcpp::elf_r_type<size>(rel.get_r_info());
- this->entries_.push_back(Copy_reloc_entry(sym, reloc_type, relobj, shndx,
- rel.get_r_offset(), 0));
+ // We need to read the symbols to find the functions. If we wanted
+ // to, we could cache reading the symbols across all sections in the
+ // object.
+ const unsigned int symtab_shndx = this->symtab_shndx_;
+ typename This::Shdr symtabshdr(pshdrs + symtab_shndx * This::shdr_size);
+ gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+
+ typename elfcpp::Elf_types<size>::Elf_WXword sh_size =
+ symtabshdr.get_sh_size();
+ const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
+ sh_size, true, true);
+
+ const int sym_size = This::sym_size;
+ const unsigned int symcount = sh_size / sym_size;
+ for (unsigned int i = 0; i < symcount; ++i, psyms += sym_size)
+ {
+ typename elfcpp::Sym<size, big_endian> isym(psyms);
+
+ // FIXME: Some targets can have functions which do not have type
+ // STT_FUNC, e.g., STT_ARM_TFUNC.
+ if (isym.get_st_type() != elfcpp::STT_FUNC
+ || isym.get_st_size() == 0)
+ continue;
+
+ bool is_ordinary;
+ Symbol_location loc;
+ loc.shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(),
+ &is_ordinary);
+ if (!is_ordinary)
+ continue;
+
+ loc.object = this;
+ loc.offset = isym.get_st_value();
+ parameters->target().function_location(&loc);
+
+ if (loc.shndx != shndx)
+ continue;
+
+ section_offset_type value =
+ convert_to_section_size_type(loc.offset);
+ section_size_type fnsize =
+ convert_to_section_size_type(isym.get_st_size());
+
+ (*function_offsets)[value] = fnsize;
+ }
}
-// Save a Rela reloc.
+// Reverse the words in a section. Used for .ctors sections mapped to
+// .init_array sections. See ctors_sections_in_init_array in
+// layout.cc.
template<int size, bool big_endian>
void
-Copy_relocs<size, big_endian>::save(
- Symbol* sym,
- Relobj* relobj,
- unsigned int shndx,
- const elfcpp::Rela<size, big_endian>& rela)
+Sized_relobj_file<size, big_endian>::reverse_words(unsigned char* view,
+ section_size_type view_size)
+{
+ typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype;
+ Valtype* vview = reinterpret_cast<Valtype*>(view);
+ section_size_type vview_size = view_size / (size / 8);
+ for (section_size_type i = 0; i < vview_size / 2; ++i)
+ {
+ Valtype tmp = vview[i];
+ vview[i] = vview[vview_size - 1 - i];
+ vview[vview_size - 1 - i] = tmp;
+ }
+}
+
+// Class Merged_symbol_value.
+
+template<int size>
+void
+Merged_symbol_value<size>::initialize_input_to_output_map(
+ const Relobj* object,
+ unsigned int input_shndx)
{
- unsigned int reloc_type = elfcpp::elf_r_type<size>(rela.get_r_info());
- this->entries_.push_back(Copy_reloc_entry(sym, reloc_type, relobj, shndx,
- rela.get_r_offset(),
- rela.get_r_addend()));
+ object->initialize_input_to_output_map<size>(input_shndx,
+ this->output_start_address_,
+ &this->output_addresses_);
}
-// Return whether there are any relocs to emit. We don't want to emit
-// a reloc if the symbol is no longer defined in a dynamic object.
+// 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_output_offset(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
-Copy_relocs<size, big_endian>::any_to_emit()
+Track_relocs<size, big_endian>::initialize(
+ Object* object,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type)
{
- for (typename Copy_reloc_entries::iterator p = this->entries_.begin();
- p != this->entries_.end();
- ++p)
+ // 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)
{
- if (p->should_emit())
- return true;
+ 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 false;
+
+ return true;
}
-// Emit relocs.
+// Return the offset of the next reloc, or -1 if there isn't one.
template<int size, bool big_endian>
-template<int sh_type>
-void
-Copy_relocs<size, big_endian>::emit(
- Output_data_reloc<sh_type, true, size, big_endian>* reloc_data)
+off_t
+Track_relocs<size, big_endian>::next_offset() const
{
- for (typename Copy_reloc_entries::iterator p = this->entries_.begin();
- p != this->entries_.end();
- ++p)
+ 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;
+ Sized_target<size, big_endian>* target
+ = parameters->sized_target<size, big_endian>();
+ return target->get_r_sym(this->prelocs_ + this->pos_);
+}
+
+// Return the addend of the next reloc, or 0 if there isn't one.
+
+template<int size, bool big_endian>
+uint64_t
+Track_relocs<size, big_endian>::next_addend() const
+{
+ if (this->pos_ >= this->len_)
+ return 0;
+ if (this->reloc_size_ == elfcpp::Elf_sizes<size>::rel_size)
+ return 0;
+ elfcpp::Rela<size, big_endian> rela(this->prelocs_ + this->pos_);
+ return rela.get_r_addend();
+}
+
+// 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_)
{
- if (p->should_emit())
- p->emit(reloc_data);
+ // 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. We could use the configure
-// script to restrict this to only the ones for implemented targets.
+// Instantiate the templates we need.
#ifdef HAVE_TARGET_32_LITTLE
template
void
-Sized_relobj<32, false>::do_read_relocs(Read_relocs_data* rd);
+Sized_relobj_file<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);
+Sized_relobj_file<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);
+Sized_relobj_file<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);
+Sized_relobj_file<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);
+Sized_relobj_file<32, false>::do_gc_process_relocs(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);
+Sized_relobj_file<32, true>::do_gc_process_relocs(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);
+Sized_relobj_file<64, false>::do_gc_process_relocs(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);
+Sized_relobj_file<64, true>::do_gc_process_relocs(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 Layout* layout,
- Output_file* of);
+Sized_relobj_file<32, false>::do_scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
#endif
#ifdef HAVE_TARGET_32_BIG
template
void
-Sized_relobj<32, true>::do_relocate(const General_options& options,
- const Symbol_table* symtab,
- const Layout* layout,
- Output_file* of);
+Sized_relobj_file<32, true>::do_scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
#endif
#ifdef HAVE_TARGET_64_LITTLE
template
void
-Sized_relobj<64, false>::do_relocate(const General_options& options,
- const Symbol_table* symtab,
- const Layout* layout,
- Output_file* of);
+Sized_relobj_file<64, false>::do_scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
#endif
#ifdef HAVE_TARGET_64_BIG
template
void
-Sized_relobj<64, true>::do_relocate(const General_options& options,
- const Symbol_table* symtab,
- const Layout* layout,
- Output_file* of);
+Sized_relobj_file<64, true>::do_scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
#endif
#ifdef HAVE_TARGET_32_LITTLE
template
-class Copy_relocs<32, false>;
+void
+Sized_relobj_file<32, false>::do_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of);
#endif
#ifdef HAVE_TARGET_32_BIG
template
-class Copy_relocs<32, true>;
+void
+Sized_relobj_file<32, true>::do_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of);
#endif
#ifdef HAVE_TARGET_64_LITTLE
template
-class Copy_relocs<64, false>;
+void
+Sized_relobj_file<64, false>::do_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of);
#endif
#ifdef HAVE_TARGET_64_BIG
template
-class Copy_relocs<64, true>;
+void
+Sized_relobj_file<64, true>::do_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of);
#endif
#ifdef HAVE_TARGET_32_LITTLE
template
void
-Copy_relocs<32, false>::emit<elfcpp::SHT_REL>(
- Output_data_reloc<elfcpp::SHT_REL, true, 32, false>*);
+Sized_relobj_file<32, false>::do_relocate_sections(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews);
+
+template
+void
+Sized_relobj_file<32, false>::relocate_section_range(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews,
+ unsigned int start_shndx,
+ unsigned int end_shndx);
+
+template
+unsigned char*
+Sized_relobj_file<32, false>::do_get_output_view(
+ unsigned int shndx,
+ section_size_type* plen) const;
#endif
#ifdef HAVE_TARGET_32_BIG
template
void
-Copy_relocs<32, true>::emit<elfcpp::SHT_REL>(
- Output_data_reloc<elfcpp::SHT_REL, true, 32, true>*);
+Sized_relobj_file<32, true>::do_relocate_sections(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews);
+
+template
+void
+Sized_relobj_file<32, true>::relocate_section_range(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews,
+ unsigned int start_shndx,
+ unsigned int end_shndx);
+
+template
+unsigned char*
+Sized_relobj_file<32, true>::do_get_output_view(
+ unsigned int shndx,
+ section_size_type* plen) const;
#endif
#ifdef HAVE_TARGET_64_LITTLE
template
void
-Copy_relocs<64, false>::emit<elfcpp::SHT_REL>(
- Output_data_reloc<elfcpp::SHT_REL, true, 64, false>*);
+Sized_relobj_file<64, false>::do_relocate_sections(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews);
+
+template
+void
+Sized_relobj_file<64, false>::relocate_section_range(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews,
+ unsigned int start_shndx,
+ unsigned int end_shndx);
+
+template
+unsigned char*
+Sized_relobj_file<64, false>::do_get_output_view(
+ unsigned int shndx,
+ section_size_type* plen) const;
#endif
#ifdef HAVE_TARGET_64_BIG
template
void
-Copy_relocs<64, true>::emit<elfcpp::SHT_REL>(
- Output_data_reloc<elfcpp::SHT_REL, true, 64, true>*);
+Sized_relobj_file<64, true>::do_relocate_sections(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews);
+
+template
+void
+Sized_relobj_file<64, true>::relocate_section_range(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews,
+ unsigned int start_shndx,
+ unsigned int end_shndx);
+
+template
+unsigned char*
+Sized_relobj_file<64, true>::do_get_output_view(
+ unsigned int shndx,
+ section_size_type* plen) const;
#endif
#ifdef HAVE_TARGET_32_LITTLE
template
void
-Copy_relocs<32, false>::emit<elfcpp::SHT_RELA>(
- Output_data_reloc<elfcpp::SHT_RELA , true, 32, false>*);
+Sized_relobj_file<32, false>::initialize_input_to_output_maps();
+
+template
+void
+Sized_relobj_file<32, false>::free_input_to_output_maps();
#endif
#ifdef HAVE_TARGET_32_BIG
template
void
-Copy_relocs<32, true>::emit<elfcpp::SHT_RELA>(
- Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>*);
+Sized_relobj_file<32, true>::initialize_input_to_output_maps();
+
+template
+void
+Sized_relobj_file<32, true>::free_input_to_output_maps();
#endif
#ifdef HAVE_TARGET_64_LITTLE
template
void
-Copy_relocs<64, false>::emit<elfcpp::SHT_RELA>(
- Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>*);
+Sized_relobj_file<64, false>::initialize_input_to_output_maps();
+
+template
+void
+Sized_relobj_file<64, false>::free_input_to_output_maps();
#endif
#ifdef HAVE_TARGET_64_BIG
template
void
-Copy_relocs<64, true>::emit<elfcpp::SHT_RELA>(
- Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>*);
+Sized_relobj_file<64, true>::initialize_input_to_output_maps();
+
+template
+void
+Sized_relobj_file<64, true>::free_input_to_output_maps();
+#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.
projects / binutils.git / blobdiff