class Target_i386 : public Sized_target<32, false>
{
public:
+ typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
+
Target_i386()
: Sized_target<32, false>(&i386_info),
- got_(NULL), plt_(NULL), got_plt_(NULL)
+ got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL),
+ copy_relocs_(NULL), dynbss_(NULL)
{ }
// Scan the relocations to look for symbol adjustments.
const unsigned char* plocal_symbols,
Symbol** global_symbols);
+ // Finalize the sections.
+ void
+ do_finalize_sections(const General_options*, Layout*);
+
// Relocate a section.
void
relocate_section(const Relocate_info<32, false>*,
relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum,
const elfcpp::Rel<32, false>&,
unsigned int r_type, const Sized_symbol<32>*,
- elfcpp::Elf_types<32>::Elf_Addr,
+ const Symbol_value<32>*,
unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
off_t);
relocate_tls(const Relocate_info<32, false>*, size_t relnum,
const elfcpp::Rel<32, false>&,
unsigned int r_type, const Sized_symbol<32>*,
- elfcpp::Elf_types<32>::Elf_Addr,
+ const Symbol_value<32>*,
unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, off_t);
// Do a TLS Initial-Exec to Local-Exec transition.
return this->plt_;
}
+ // Get the dynamic reloc section, creating it if necessary.
+ Reloc_section*
+ rel_dyn_section(Layout*);
+
// Copy a relocation against a global symbol.
void
- copy_reloc(const General_options*, Sized_relobj<32, false>*, unsigned int,
+ copy_reloc(const General_options*, Symbol_table*, Layout*,
+ Sized_relobj<32, false>*, unsigned int,
Symbol*, const elfcpp::Rel<32, false>&);
// Information about this specific target which we pass to the
Output_data_plt_i386* plt_;
// The GOT PLT section.
Output_data_space* got_plt_;
+ // The dynamic reloc section.
+ Reloc_section* rel_dyn_;
+ // Relocs saved to avoid a COPY reloc.
+ Copy_relocs<32, false>* copy_relocs_;
+ // Space for variables copied with a COPY reloc.
+ Output_data_space* dynbss_;
};
const Target::Target_info Target_i386::i386_info =
this->got_ = new Output_data_got<32, false>(options);
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
- elfcpp::SHF_ALLOC, this->got_);
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->got_);
// The old GNU linker creates a .got.plt section. We just
// create another set of data in the .got section. Note that we
// might be empty.
this->got_plt_ = new Output_data_space(4);
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
- elfcpp::SHF_ALLOC, this->got_plt_);
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->got_plt_);
// The first three entries are reserved.
this->got_plt_->set_space_size(3 * 4);
// Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
- symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_",
+ symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_", NULL,
this->got_plt_,
0, 0, elfcpp::STT_OBJECT,
- elfcpp::STB_GLOBAL,
+ elfcpp::STB_LOCAL,
elfcpp::STV_HIDDEN, 0,
false, false);
}
return this->got_;
}
+// Get the dynamic reloc section, creating it if necessary.
+
+Target_i386::Reloc_section*
+Target_i386::rel_dyn_section(Layout* layout)
+{
+ if (this->rel_dyn_ == NULL)
+ {
+ gold_assert(layout != NULL);
+ this->rel_dyn_ = new Reloc_section();
+ layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
+ elfcpp::SHF_ALLOC, this->rel_dyn_);
+ }
+ return this->rel_dyn_;
+}
+
// A class to handle the PLT data.
class Output_data_plt_i386 : public Output_section_data
void
add_entry(Symbol* gsym);
+ // Return the .rel.plt section data.
+ const Reloc_section*
+ rel_plt() const
+ { return this->rel_; }
+
+ protected:
+ void
+ do_adjust_output_section(Output_section* os);
+
private:
// The size of an entry in the PLT.
static const int plt_entry_size = 16;
elfcpp::SHF_ALLOC, this->rel_);
}
+// For some reason
+
+void
+Output_data_plt_i386::do_adjust_output_section(Output_section* os)
+{
+ // UnixWare sets the entsize of .plt to 4, and so does the old GNU
+ // linker, and so do we.
+ os->set_entsize(4);
+}
+
// Add an entry to the PLT.
void
this->got_plt_->set_space_size(got_offset + 4);
// Every PLT entry needs a reloc.
+ gsym->set_needs_dynsym_entry();
this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
got_offset);
this->plt_ = new Output_data_plt_i386(layout, this->got_plt_,
options->is_shared());
+ layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_EXECINSTR),
+ this->plt_);
}
this->plt_->add_entry(gsym);
void
Target_i386::copy_reloc(const General_options* options,
+ Symbol_table* symtab,
+ Layout* layout,
Sized_relobj<32, false>* object,
unsigned int data_shndx, Symbol* gsym,
- const elfcpp::Rel<32, false>&)
+ const elfcpp::Rel<32, false>& rel)
{
- if (!Relocate_functions<32, false>::need_copy_reloc(options, object,
- data_shndx, gsym))
+ Sized_symbol<32>* ssym;
+ ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(32) (gsym
+ SELECT_SIZE(32));
+
+ if (!Copy_relocs<32, false>::need_copy_reloc(options, object,
+ data_shndx, ssym))
{
// So far we do not need a COPY reloc. Save this relocation.
- // If it turns out that we never a COPY reloc for this symbol,
- // then we emit the relocation.
+ // If it turns out that we never need a COPY reloc for this
+ // symbol, then we will emit the relocation.
+ if (this->copy_relocs_ == NULL)
+ this->copy_relocs_ = new Copy_relocs<32, false>();
+ this->copy_relocs_->save(ssym, object, data_shndx, rel);
}
+ else
+ {
+ // Allocate space for this symbol in the .bss section.
+
+ elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize();
+
+ // There is no defined way to determine the required alignment
+ // of the symbol. We pick the alignment based on the size. We
+ // set an arbitrary maximum of 256.
+ unsigned int align;
+ for (align = 1; align < 512; align <<= 1)
+ if ((symsize & align) != 0)
+ break;
+ if (this->dynbss_ == NULL)
+ {
+ this->dynbss_ = new Output_data_space(align);
+ layout->add_output_section_data(".bss",
+ elfcpp::SHT_NOBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->dynbss_);
+ }
+
+ Output_data_space* dynbss = this->dynbss_;
+
+ if (align > dynbss->addralign())
+ dynbss->set_space_alignment(align);
+
+ off_t dynbss_size = dynbss->data_size();
+ dynbss_size = align_address(dynbss_size, align);
+ off_t offset = dynbss_size;
+ dynbss->set_space_size(dynbss_size + symsize);
+
+ // Define the symbol in the .dynbss section.
+ symtab->define_in_output_data(this, ssym->name(), ssym->version(),
+ dynbss, offset, symsize, ssym->type(),
+ ssym->binding(), ssym->visibility(),
+ ssym->nonvis(), false, false);
+
+ // Add the COPY reloc.
+ ssym->set_needs_dynsym_entry();
+ Reloc_section* rel_dyn = this->rel_dyn_section(layout);
+ rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset);
+ }
}
// Optimize the TLS relocation type based on what we know about the
// relocation in order to avoid a COPY relocation.
gold_assert(!options.is_shared());
- if (gsym->is_defined_in_dynobj())
+ if (gsym->is_from_dynobj())
{
// This symbol is defined in a dynamic object. If it is a
// function, we make a PLT entry. Otherwise we need to
if (gsym->type() == elfcpp::STT_FUNC)
target->make_plt_entry(&options, symtab, layout, gsym);
else
- target->copy_reloc(&options, object, data_shndx, gsym, reloc);
+ target->copy_reloc(&options, symtab, layout, object, data_shndx,
+ gsym, reloc);
}
break;
global_symbols);
}
+// Finalize the sections.
+
+void
+Target_i386::do_finalize_sections(const General_options* options,
+ Layout* layout)
+{
+ // Fill in some more dynamic tags.
+ Output_data_dynamic* const odyn = layout->dynamic_data();
+ if (odyn != NULL)
+ {
+ if (this->got_plt_ != NULL)
+ odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_);
+
+ if (this->plt_ != NULL)
+ {
+ const Output_data* od = this->plt_->rel_plt();
+ odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
+ odyn->add_section_address(elfcpp::DT_JMPREL, od);
+ odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL);
+ }
+
+ if (this->rel_dyn_ != NULL)
+ {
+ const Output_data* od = this->rel_dyn_;
+ odyn->add_section_address(elfcpp::DT_REL, od);
+ odyn->add_section_size(elfcpp::DT_RELSZ, od);
+ odyn->add_constant(elfcpp::DT_RELENT,
+ elfcpp::Elf_sizes<32>::rel_size);
+ }
+
+ if (!options->is_shared())
+ {
+ // The value of the DT_DEBUG tag is filled in by the dynamic
+ // linker at run time, and used by the debugger.
+ odyn->add_constant(elfcpp::DT_DEBUG, 0);
+ }
+ }
+
+ // Emit any relocs we saved in an attempt to avoid generating COPY
+ // relocs.
+ if (this->copy_relocs_ == NULL)
+ return;
+ if (this->copy_relocs_->any_to_emit())
+ {
+ Reloc_section* rel_dyn = this->rel_dyn_section(layout);
+ this->copy_relocs_->emit(rel_dyn);
+ }
+ delete this->copy_relocs_;
+ this->copy_relocs_ = NULL;
+}
+
// Perform a relocation.
inline bool
const elfcpp::Rel<32, false>& rel,
unsigned int r_type,
const Sized_symbol<32>* gsym,
- elfcpp::Elf_types<32>::Elf_Addr value,
+ const Symbol_value<32>* psymval,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr address,
off_t view_size)
}
// Pick the value to use for symbols defined in shared objects.
- if (gsym != NULL && gsym->is_defined_in_dynobj())
+ Symbol_value<32> symval;
+ if (gsym != NULL && gsym->is_from_dynobj())
{
- if (gsym->has_plt_offset())
- address = target->plt_section()->address() + gsym->plt_offset();
- else
+ if (!gsym->has_plt_offset())
gold_unreachable();
+
+ symval.set_output_value(target->plt_section()->address()
+ + gsym->plt_offset());
+ psymval = &symval;
}
+ const Sized_relobj<32, false>* object = relinfo->object;
+
switch (r_type)
{
case elfcpp::R_386_NONE:
break;
case elfcpp::R_386_32:
- Relocate_functions<32, false>::rel32(view, value);
+ Relocate_functions<32, false>::rel32(view, object, psymval);
break;
case elfcpp::R_386_PC32:
- Relocate_functions<32, false>::pcrel32(view, value, address);
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
break;
case elfcpp::R_386_16:
- Relocate_functions<32, false>::rel16(view, value);
+ Relocate_functions<32, false>::rel16(view, object, psymval);
break;
case elfcpp::R_386_PC16:
- Relocate_functions<32, false>::pcrel16(view, value, address);
+ Relocate_functions<32, false>::pcrel16(view, object, psymval, address);
break;
case elfcpp::R_386_8:
- Relocate_functions<32, false>::rel8(view, value);
+ Relocate_functions<32, false>::rel8(view, object, psymval);
break;
case elfcpp::R_386_PC8:
- Relocate_functions<32, false>::pcrel8(view, value, address);
+ Relocate_functions<32, false>::pcrel8(view, object, psymval, address);
break;
case elfcpp::R_386_PLT32:
gold_assert(gsym->has_plt_offset()
|| gsym->final_value_is_known(relinfo->options));
- Relocate_functions<32, false>::pcrel32(view, value, address);
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
break;
case elfcpp::R_386_GOT32:
// Local GOT offsets not yet supported.
gold_assert(gsym);
gold_assert(gsym->has_got_offset());
- value = gsym->got_offset();
- Relocate_functions<32, false>::rel32(view, value);
+ Relocate_functions<32, false>::rel32(view, gsym->got_offset());
break;
case elfcpp::R_386_GOTOFF:
- value -= target->got_section(NULL, NULL, NULL)->address();
- Relocate_functions<32, false>::rel32(view, value);
+ {
+ elfcpp::Elf_types<32>::Elf_Addr value;
+ value = (psymval->value(object, 0)
+ - target->got_section(NULL, NULL, NULL)->address());
+ Relocate_functions<32, false>::rel32(view, value);
+ }
break;
case elfcpp::R_386_GOTPC:
- value = target->got_section(NULL, NULL, NULL)->address();
- Relocate_functions<32, false>::pcrel32(view, value, address);
+ {
+ elfcpp::Elf_types<32>::Elf_Addr value;
+ value = target->got_section(NULL, NULL, NULL)->address();
+ Relocate_functions<32, false>::pcrel32(view, value, address);
+ }
break;
case elfcpp::R_386_COPY:
case elfcpp::R_386_TLS_LE_32:
case elfcpp::R_386_TLS_GOTDESC:
case elfcpp::R_386_TLS_DESC_CALL:
- this->relocate_tls(relinfo, relnum, rel, r_type, gsym, value, view,
+ this->relocate_tls(relinfo, relnum, rel, r_type, gsym, psymval, view,
address, view_size);
break;
const elfcpp::Rel<32, false>& rel,
unsigned int r_type,
const Sized_symbol<32>* gsym,
- elfcpp::Elf_types<32>::Elf_Addr value,
+ const Symbol_value<32>* psymval,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr,
off_t view_size)
gold_exit(false);
}
+ elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(relinfo->object, 0);
+
const bool is_final = (gsym == NULL
? !relinfo->options->is_shared()
: gsym->final_value_is_known(relinfo->options));
projects / deliverable / binutils-gdb.git / blobdiff