// reloc.cc -- relocate input files for gold.
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright (C) 2006-2015 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <algorithm>
#include "workqueue.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
{
void
Read_relocs::locks(Task_locker* tl)
{
- tl->add(this, this->object_->token());
+ 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);
this->object_->set_relocs_data(rd);
this->object_->release();
- // If garbage collection is desired, we must process the relocs
- // instead of scanning the relocs as reloc processing is necessary
- // to determine unused sections.
- if (parameters->options().gc_sections())
- {
- workqueue->queue_next(new Gc_process_relocs(this->options_,
- this->symtab_,
+ // 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->symtab_lock_,
- this->blocker_));
+ this->this_blocker_,
+ this->next_blocker_));
}
else
{
- workqueue->queue_next(new Scan_relocs(this->options_, this->symtab_,
- this->layout_, this->object_, rd,
- this->symtab_lock_,
- this->blocker_));
+ workqueue->queue_next(new Scan_relocs(this->symtab_, this->layout_,
+ this->object_, rd,
+ this->this_blocker_,
+ this->next_blocker_));
}
}
// Gc_process_relocs methods.
-// These tasks process the relocations read by Read_relocs and
+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 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;
Gc_process_relocs::locks(Task_locker* tl)
{
tl->add(this, this->object_->token());
- tl->add(this, this->blocker_);
+ tl->add(this, this->next_blocker_);
}
void
Gc_process_relocs::run(Workqueue*)
{
- this->object_->gc_process_relocs(this->options_, this->symtab_, this->layout_,
- this->rd_);
+ this->object_->gc_process_relocs(this->symtab_, this->layout_, this->rd_);
this->object_->release();
}
// 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
Task_token*
Scan_relocs::is_runnable()
{
- if (!this->symtab_lock_->is_writable())
- return this->symtab_lock_;
+ 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
Scan_relocs::locks(Task_locker* tl)
{
- tl->add(this, this->object_->token());
- tl->add(this, this->symtab_lock_);
- tl->add(this, this->blocker_);
+ 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_->release();
+ this->object_->scan_relocs(this->symtab_, this->layout_, this->rd_);
delete this->rd_;
this->rd_ = NULL;
+ this->object_->release();
}
// Return a debugging name for the task.
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());
+ 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.
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 Output_sections& out_sections(this->output_sections());
- const std::vector<Address>& out_offsets(this->section_offsets_);
+ const std::vector<Address>& out_offsets(this->section_offsets());
- const unsigned char *pshdrs = this->get_view(this->elf_file_.shoff(),
+ 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);
// 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.
+ // 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);
bool is_section_allocated = ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC)
!= 0);
if (!is_section_allocated
&& !parameters->options().relocatable()
- && !parameters->options().emit_relocs())
+ && !parameters->options().emit_relocs()
+ && !parameters->incremental())
continue;
if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_)
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;
}
// Process the relocs to generate mappings from source sections to referenced
-// sections. This is used during garbage colletion to determine garbage
+// sections. This is used during garbage collection to determine garbage
// sections.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::do_gc_process_relocs(const General_options& options,
- Symbol_table* symtab,
- Layout* layout,
- Read_relocs_data* rd)
+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 = 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)
// 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(options, symtab, layout, this,
+ target->gc_process_relocs(symtab, layout, this,
p->data_shndx, p->sh_type,
p->contents->data(), p->reloc_count,
p->output_section,
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options,
- Symbol_table* symtab,
+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)
// 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())
+ if (parameters->options().gc_sections()
+ || parameters->options().icf_enabled())
{
if (p->output_section == NULL)
continue;
// 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,
+ 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(options, symtab, layout, local_symbols, p);
+ 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(options, symtab, layout, this,
+ target->scan_relocatable_relocs(symtab, layout, this,
p->data_shndx, p->sh_type,
p->contents->data(),
p->reloc_count,
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;
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::emit_relocs_scan(
- const General_options& options,
+Sized_relobj_file<size, big_endian>::emit_relocs_scan(
Symbol_table* symtab,
Layout* layout,
const unsigned char* plocal_syms,
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,
+ this->emit_relocs_scan_reltype<elfcpp::SHT_REL>(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);
+ this->emit_relocs_scan_reltype<elfcpp::SHT_RELA>(symtab, layout,
+ plocal_syms, p, rr);
}
}
template<int size, bool big_endian>
template<int sh_type>
void
-Sized_relobj<size, big_endian>::emit_relocs_scan_reltype(
- const General_options& options,
+Sized_relobj_file<size, big_endian>::emit_relocs_scan_reltype(
Symbol_table* symtab,
Layout* layout,
const unsigned char* plocal_syms,
{
scan_relocatable_relocs<size, big_endian, sh_type,
Emit_relocs_strategy<sh_type> >(
- options,
symtab,
layout,
this,
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;
+
+ 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();
// 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.
// 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.
{
if (views[i].view != NULL)
{
+ 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)
// Write out the local symbols.
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();
+ layout->symtab_xindex(), layout->dynsym_xindex(),
+ layout->symtab_section_offset());
}
// Sort a Read_multiple vector by file offset.
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();
const Output_sections& out_sections(this->output_sections());
- const std::vector<Address>& out_offsets(this->section_offsets_);
+ const std::vector<Address>& out_offsets(this->section_offsets());
File_read::Read_multiple rm;
bool is_sorted = true;
pvs->address = posd->address();
pvs->is_input_output_view = false;
pvs->is_postprocessing_view = false;
+ pvs->is_ctors_reverse_view = false;
continue;
}
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
{
{
unsigned char* buffer = os->postprocessing_buffer();
view = buffer + view_start;
- if (output_offset != invalid_address)
+ if (output_offset != invalid_address && !must_decompress)
{
off_t sh_offset = shdr.get_sh_offset();
if (!rm.empty() && rm.back().file_offset > sh_offset)
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));
+ 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))
+ this->error(_("could not decompress section %s"),
+ this->section_name(i).c_str());
+ }
+
pvs->view = view;
pvs->address = os->address();
if (output_offset != invalid_address)
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.
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();
+ 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_);
+ 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;
if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
continue;
+ 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())
{
continue;
}
- off_t sh_size = shdr.get_sh_size();
const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
sh_size, true, false);
|| this->relocs_must_follow_section_writes());
relinfo.reloc_shndx = i;
+ relinfo.reloc_shdr = p;
relinfo.data_shndx = index;
+ 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);
+ }
+
if (!parameters->options().relocatable())
{
- target->relocate_section(&relinfo,
- sh_type,
- prelocs,
- reloc_count,
- os,
+ target->relocate_section(&relinfo, sh_type, prelocs, reloc_count, os,
output_offset == invalid_address,
- (*pviews)[index].view,
- (*pviews)[index].address,
- (*pviews)[index].view_size);
+ view, address, view_size, reloc_map);
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);
+ {
+ Relocatable_relocs* rr = this->relocatable_relocs(i);
+ target->relocate_relocs(&relinfo, sh_type, prelocs, reloc_count,
+ os, output_offset, rr,
+ 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
{
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);
+ target->relocate_relocs(&relinfo, sh_type, prelocs, reloc_count,
+ os, output_offset, rr,
+ view, address, view_size,
+ (*pviews)[i].view,
+ (*pviews)[i].view_size);
}
}
}
-// Emit the relocs for --emit-relocs.
+// Write the incremental relocs.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::emit_relocs(
+Sized_relobj_file<size, big_endian>::incremental_relocs_write(
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)
+ Address output_offset,
+ Output_file* of)
{
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);
+ 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->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);
+ this->incremental_relocs_write_reltype<elfcpp::SHT_RELA>(
+ relinfo,
+ prelocs,
+ reloc_count,
+ output_section,
+ output_offset,
+ of);
}
}
-// Emit the relocs for --emit-relocs, templatized on the type of the
+// 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<size, big_endian>::emit_relocs_reltype(
+Sized_relobj_file<size, big_endian>::incremental_relocs_write_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)
+ Address output_offset,
+ Output_file* of)
{
- 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);
+ 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);
+
+ 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);
+ }
}
// Create merge hash tables for the local symbols. These are used to
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::initialize_input_to_output_maps()
+Sized_relobj_file<size, big_endian>::initialize_input_to_output_maps()
{
const unsigned int loccount = this->local_symbol_count_;
for (unsigned int i = 1; i < loccount; ++i)
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::free_input_to_output_maps()
+Sized_relobj_file<size, big_endian>::free_input_to_output_maps()
{
const unsigned int loccount = this->local_symbol_count_;
for (unsigned int i = 1; i < loccount; ++i)
}
}
+// 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.
+
+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)
+{
+ 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);
+ 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);
+ }
+}
+
+// Adjust for -fsplit-stack, 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>::split_stack_adjust_reltype(
+ const Symbol_table* symtab,
+ const unsigned char* pshdrs,
+ unsigned int shndx,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ unsigned char* view,
+ section_size_type view_size,
+ Reloc_symbol_changes** reloc_map)
+{
+ typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
+ const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
+
+ size_t local_count = this->local_symbol_count();
+
+ 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)
+ {
+ Reltype reloc(pr);
+
+ typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
+ 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())
+ {
+ unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
+ if (parameters->target().is_call_to_non_split(gsym, r_type))
+ {
+ 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;
+
+ // 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,
+ 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);
+
+ typename elfcpp::Elf_types<size>::Elf_WXword r_info =
+ reloc.get_r_info();
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
+ 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);
+ }
+ }
+ }
+ }
+}
+
+// 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
+Sized_relobj_file<size, big_endian>::find_functions(
+ const unsigned char* pshdrs,
+ unsigned int shndx,
+ Sized_relobj_file<size, big_endian>::Function_offsets* function_offsets)
+{
+ // 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;
+ unsigned int sym_shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(),
+ &is_ordinary);
+ if (!is_ordinary || sym_shndx != shndx)
+ continue;
+
+ section_offset_type value =
+ convert_to_section_size_type(isym.get_st_value());
+ section_size_type fnsize =
+ convert_to_section_size_type(isym.get_st_size());
+
+ (*function_offsets)[value] = fnsize;
+ }
+}
+
+// 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
+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>
return elfcpp::elf_r_sym<size>(rel.get_r_info());
}
+// 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.
#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_gc_process_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_gc_process_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_gc_process_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_gc_process_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_scan_relocs(const General_options& options,
- Symbol_table* symtab,
- Layout* layout,
- Read_relocs_data* rd);
+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_scan_relocs(const General_options& options,
- Symbol_table* symtab,
- Layout* layout,
- Read_relocs_data* rd);
+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_scan_relocs(const General_options& options,
- Symbol_table* symtab,
- Layout* layout,
- Read_relocs_data* rd);
+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_scan_relocs(const General_options& options,
- Symbol_table* symtab,
- Layout* layout,
- Read_relocs_data* rd);
+Sized_relobj_file<64, true>::do_scan_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_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of);
#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_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of);
#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_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of);
#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_relocate(const Symbol_table* symtab,
+ const Layout* layout,
+ Output_file* of);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Sized_relobj_file<32, false>::do_relocate_sections(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Sized_relobj_file<32, true>::do_relocate_sections(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Sized_relobj_file<64, false>::do_relocate_sections(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Sized_relobj_file<64, true>::do_relocate_sections(
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ Output_file* of,
+ Views* pviews);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+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
+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
+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
+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)
projects / deliverable / binutils-gdb.git / blobdiff