// reloc.cc -- relocate input files for gold.
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include "gold.h"
+#include <algorithm>
+
#include "workqueue.h"
-#include "object.h"
#include "symtab.h"
#include "output.h"
+#include "merge.h"
+#include "object.h"
+#include "target-reloc.h"
#include "reloc.h"
namespace gold
this->object_->read_relocs(rd);
this->object_->release();
- workqueue->queue_front(new Scan_relocs(this->options_, this->symtab_,
- this->layout_, this->object_, rd,
- this->symtab_lock_, this->blocker_));
+ workqueue->queue_next(new Scan_relocs(this->options_, this->symtab_,
+ this->layout_, this->object_, rd,
+ this->symtab_lock_, this->blocker_));
}
// Return a debugging name for the task.
{
this->object_->relocate(this->options_, 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();
}
// 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.
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())
continue;
if (shdr.get_sh_link() != this->symtab_shndx_)
sr.reloc_count = reloc_count;
sr.output_section = os;
sr.needs_special_offset_handling = map_sections[shndx].offset == -1;
+ sr.is_data_section_allocated = is_section_allocated;
}
// Read the local symbols.
p != rd->relocs.end();
++p)
{
- target->scan_relocs(options, symtab, layout, this, p->data_shndx,
- p->sh_type, p->contents->data(), p->reloc_count,
- p->output_section, p->needs_special_offset_handling,
- this->local_symbol_count_,
- local_symbols);
+ if (!parameters->options().relocatable())
+ {
+ // As noted above, when not generating an object file, we
+ // only scan allocated sections. We may see a non-allocated
+ // section here if we are emitting relocs.
+ if (p->is_data_section_allocated)
+ target->scan_relocs(options, symtab, layout, this, p->data_shndx,
+ p->sh_type, p->contents->data(),
+ p->reloc_count, p->output_section,
+ p->needs_special_offset_handling,
+ this->local_symbol_count_,
+ local_symbols);
+ if (parameters->options().emit_relocs())
+ this->emit_relocs_scan(options, symtab, layout, local_symbols, p);
+ }
+ else
+ {
+ Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
+ gold_assert(rr != NULL);
+ rr->set_reloc_count(p->reloc_count);
+ target->scan_relocatable_relocs(options, symtab, layout, this,
+ p->data_shndx, p->sh_type,
+ p->contents->data(),
+ p->reloc_count,
+ p->output_section,
+ p->needs_special_offset_handling,
+ this->local_symbol_count_,
+ local_symbols,
+ rr);
+ }
+
delete p->contents;
p->contents = NULL;
}
}
}
+// This is a strategy class we use when scanning for --emit-relocs.
+
+template<int sh_type>
+class Emit_relocs_strategy
+{
+ public:
+ // A local non-section symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ local_non_section_strategy(unsigned int, Relobj*)
+ { return Relocatable_relocs::RELOC_COPY; }
+
+ // A local section symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ local_section_strategy(unsigned int, Relobj*)
+ {
+ if (sh_type == elfcpp::SHT_RELA)
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
+ else
+ {
+ // The addend is stored in the section contents. Since this
+ // is not a relocatable link, we are going to apply the
+ // relocation contents to the section as usual. This means
+ // that we have no way to record the original addend. If the
+ // original addend is not zero, there is basically no way for
+ // the user to handle this correctly. Caveat emptor.
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0;
+ }
+ }
+
+ // A global symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ global_strategy(unsigned int, Relobj*, unsigned int)
+ { return Relocatable_relocs::RELOC_COPY; }
+};
+
+// Scan the input relocations for --emit-relocs.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::emit_relocs_scan(
+ const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ const unsigned char* plocal_syms,
+ const Read_relocs_data::Relocs_list::iterator& p)
+{
+ Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
+ gold_assert(rr != NULL);
+ rr->set_reloc_count(p->reloc_count);
+
+ if (p->sh_type == elfcpp::SHT_REL)
+ this->emit_relocs_scan_reltype<elfcpp::SHT_REL>(options, symtab, layout,
+ plocal_syms, p, rr);
+ else
+ {
+ gold_assert(p->sh_type == elfcpp::SHT_RELA);
+ this->emit_relocs_scan_reltype<elfcpp::SHT_RELA>(options, symtab,
+ layout, plocal_syms, p,
+ rr);
+ }
+}
+
+// Scan the input relocation for --emit-relocs, templatized on the
+// type of the relocation section.
+
+template<int size, bool big_endian>
+template<int sh_type>
+void
+Sized_relobj<size, big_endian>::emit_relocs_scan_reltype(
+ const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ const unsigned char* plocal_syms,
+ const Read_relocs_data::Relocs_list::iterator& p,
+ Relocatable_relocs* rr)
+{
+ scan_relocatable_relocs<size, big_endian, sh_type,
+ Emit_relocs_strategy<sh_type> >(
+ options,
+ symtab,
+ layout,
+ this,
+ p->data_shndx,
+ p->contents->data(),
+ p->reloc_count,
+ p->output_section,
+ p->needs_special_offset_handling,
+ this->local_symbol_count_,
+ plocal_syms,
+ rr);
+}
+
// Relocate the input sections and write out the local symbols.
template<int size, bool big_endian>
this->write_sections(pshdrs, of, &views);
+ // To speed up relocations, we set up hash tables for fast lookup of
+ // input offsets to output addresses.
+ this->initialize_input_to_output_maps();
+
// Apply relocations.
this->relocate_sections(options, symtab, layout, pshdrs, &views);
+ // After we've done the relocations, we release the hash tables,
+ // since we no longer need them.
+ this->free_input_to_output_maps();
+
// Write out the accumulated views.
for (unsigned int i = 1; i < shnum; ++i)
{
// Write out the local symbols.
this->write_local_symbols(of, layout->sympool(), layout->dynpool());
+
+ // We should no longer need the local symbol values.
+ this->clear_local_symbols();
}
+// Sort a Read_multiple vector by file offset.
+struct Read_multiple_compare
+{
+ inline bool
+ operator()(const File_read::Read_multiple_entry& rme1,
+ const File_read::Read_multiple_entry& rme2) const
+ { return rme1.file_offset < rme2.file_offset; }
+};
+
// Write section data to the output file. PSHDRS points to the
// section headers. Record the views in *PVIEWS for use when
// relocating.
void
Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
Output_file* of,
- Views* pviews) const
+ Views* pviews)
{
unsigned int shnum = this->shnum();
const std::vector<Map_to_output>& map_sections(this->map_to_output());
+ 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)
{
if (shdr.get_sh_type() == elfcpp::SHT_NOBITS)
continue;
+ if ((parameters->options().relocatable()
+ || parameters->options().emit_relocs())
+ && (shdr.get_sh_type() == elfcpp::SHT_REL
+ || shdr.get_sh_type() == elfcpp::SHT_RELA)
+ && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+ {
+ // This is a reloc section in a relocatable link or when
+ // emitting relocs. We don't need to read the input file.
+ // The size and file offset are stored in the
+ // Relocatable_relocs structure.
+ Relocatable_relocs* rr = this->relocatable_relocs(i);
+ gold_assert(rr != NULL);
+ Output_data* posd = rr->output_data();
+ gold_assert(posd != NULL);
+
+ pvs->offset = posd->offset();
+ pvs->view_size = posd->data_size();
+ pvs->view = of->get_output_view(pvs->offset, pvs->view_size);
+ pvs->address = posd->address();
+ pvs->is_input_output_view = false;
+ pvs->is_postprocessing_view = false;
+
+ continue;
+ }
+
// In the normal case, this input section is simply mapped to
// the output section at offset OUTPUT_OFFSET.
}
off_t view_start;
- off_t view_size;
+ section_size_type view_size;
if (output_offset != -1)
{
view_start = output_section_offset + output_offset;
- view_size = shdr.get_sh_size();
+ view_size = convert_to_section_size_type(shdr.get_sh_size());
}
else
{
view_start = output_section_offset;
- view_size = output_section_size;
+ view_size = convert_to_section_size_type(output_section_size);
}
if (view_size == 0)
gold_assert(output_offset == -1
|| (output_offset >= 0
- && output_offset + view_size <= output_section_size));
+ && (output_offset + static_cast<off_t>(view_size)
+ <= output_section_size)));
unsigned char* view;
if (os->requires_postprocessing())
unsigned char* buffer = os->postprocessing_buffer();
view = buffer + view_start;
if (output_offset != -1)
- this->read(shdr.get_sh_offset(), view_size, view);
+ {
+ 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
{
else
{
view = of->get_output_view(view_start, view_size);
- this->read(shdr.get_sh_offset(), view_size, view);
+ 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));
}
}
pvs->is_input_output_view = output_offset == -1;
pvs->is_postprocessing_view = os->requires_postprocessing();
}
+
+ // Actually read the data.
+ if (!rm.empty())
+ {
+ if (!is_sorted)
+ std::sort(rm.begin(), rm.end(), Read_multiple_compare());
+ this->read_multiple(rm);
+ }
}
// Relocate section data. VIEWS points to the section data as views
off_t output_offset = map_sections[index].offset;
gold_assert((*pviews)[index].view != NULL);
+ if (parameters->options().relocatable())
+ gold_assert((*pviews)[i].view != NULL);
if (shdr.get_sh_link() != this->symtab_shndx_)
{
relinfo.reloc_shndx = i;
relinfo.data_shndx = index;
- target->relocate_section(&relinfo,
- sh_type,
- prelocs,
- reloc_count,
- os,
- output_offset == -1,
- (*pviews)[index].view,
- (*pviews)[index].address,
- (*pviews)[index].view_size);
+ if (!parameters->options().relocatable())
+ {
+ target->relocate_section(&relinfo,
+ sh_type,
+ prelocs,
+ reloc_count,
+ os,
+ output_offset == -1,
+ (*pviews)[index].view,
+ (*pviews)[index].address,
+ (*pviews)[index].view_size);
+ if (parameters->options().emit_relocs())
+ this->emit_relocs(&relinfo, i, sh_type, prelocs, reloc_count,
+ os, output_offset,
+ (*pviews)[index].view,
+ (*pviews)[index].address,
+ (*pviews)[index].view_size,
+ (*pviews)[i].view,
+ (*pviews)[i].view_size);
+ }
+ else
+ {
+ Relocatable_relocs* rr = this->relocatable_relocs(i);
+ target->relocate_for_relocatable(&relinfo,
+ sh_type,
+ prelocs,
+ reloc_count,
+ os,
+ output_offset,
+ rr,
+ (*pviews)[index].view,
+ (*pviews)[index].address,
+ (*pviews)[index].view_size,
+ (*pviews)[i].view,
+ (*pviews)[i].view_size);
+ }
+ }
+}
+
+// Emit the relocs for --emit-relocs.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::emit_relocs(
+ const Relocate_info<size, big_endian>* relinfo,
+ unsigned int i,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ off_t offset_in_output_section,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
+ section_size_type view_size,
+ unsigned char* reloc_view,
+ section_size_type reloc_view_size)
+{
+ if (sh_type == elfcpp::SHT_REL)
+ this->emit_relocs_reltype<elfcpp::SHT_REL>(relinfo, i, prelocs,
+ reloc_count, output_section,
+ offset_in_output_section,
+ view, address, view_size,
+ reloc_view, reloc_view_size);
+ else
+ {
+ gold_assert(sh_type == elfcpp::SHT_RELA);
+ this->emit_relocs_reltype<elfcpp::SHT_RELA>(relinfo, i, prelocs,
+ reloc_count, output_section,
+ offset_in_output_section,
+ view, address, view_size,
+ reloc_view, reloc_view_size);
+ }
+}
+
+// Emit the relocs for --emit-relocs, templatized on the type of the
+// relocation section.
+
+template<int size, bool big_endian>
+template<int sh_type>
+void
+Sized_relobj<size, big_endian>::emit_relocs_reltype(
+ const Relocate_info<size, big_endian>* relinfo,
+ unsigned int i,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ off_t offset_in_output_section,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
+ section_size_type view_size,
+ unsigned char* reloc_view,
+ section_size_type reloc_view_size)
+{
+ const Relocatable_relocs* rr = this->relocatable_relocs(i);
+ relocate_for_relocatable<size, big_endian, sh_type>(
+ relinfo,
+ prelocs,
+ reloc_count,
+ output_section,
+ offset_in_output_section,
+ rr,
+ view,
+ address,
+ view_size,
+ reloc_view,
+ reloc_view_size);
+}
+
+// Create merge hash tables for the local symbols. These are used to
+// speed up relocations.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::initialize_input_to_output_maps()
+{
+ const unsigned int loccount = this->local_symbol_count_;
+ for (unsigned int i = 1; i < loccount; ++i)
+ {
+ Symbol_value<size>& lv(this->local_values_[i]);
+ lv.initialize_input_to_output_map(this);
}
}
+// Free merge hash tables for the local symbols.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::free_input_to_output_maps()
+{
+ const unsigned int loccount = this->local_symbol_count_;
+ for (unsigned int i = 1; i < loccount; ++i)
+ {
+ Symbol_value<size>& lv(this->local_values_[i]);
+ lv.free_input_to_output_map();
+ }
+}
+
+// Class Merged_symbol_value.
+
+template<int size>
+void
+Merged_symbol_value<size>::initialize_input_to_output_map(
+ const Relobj* object,
+ unsigned int input_shndx)
+{
+ Object_merge_map* map = object->merge_map();
+ map->initialize_input_to_output_map<size>(input_shndx,
+ this->output_start_address_,
+ &this->output_addresses_);
+}
+
+// Get the output value corresponding to an input offset if we
+// couldn't find it in the hash table.
+
+template<int size>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Merged_symbol_value<size>::value_from_output_section(
+ const Relobj* object,
+ unsigned int input_shndx,
+ typename elfcpp::Elf_types<size>::Elf_Addr input_offset) const
+{
+ section_offset_type output_offset;
+ bool found = object->merge_map()->get_output_offset(NULL, input_shndx,
+ input_offset,
+ &output_offset);
+
+ // If this assertion fails, it means that some relocation was
+ // against a portion of an input merge section which we didn't map
+ // to the output file and we didn't explicitly discard. We should
+ // always map all portions of input merge sections.
+ gold_assert(found);
+
+ if (output_offset == -1)
+ return 0;
+ else
+ return this->output_start_address_ + output_offset;
+}
+
// Copy_relocs::Copy_reloc_entry methods.
// Return whether we should emit this reloc. We should emit it if the
Output_file* of);
#endif
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+class Merged_symbol_value<32>;
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+class Merged_symbol_value<64>;
+#endif
+
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+class Symbol_value<32>;
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+class Symbol_value<64>;
+#endif
+
#ifdef HAVE_TARGET_32_LITTLE
template
class Copy_relocs<32, false>;
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