2009-05-29 Doug Kwan <dougkwan@google.com>
* gold/arm.cc (Output_data_plt_arm): Forward declaration for new template class. (class Target_arm): Update comment. (Target_arm::Target_arm): Initialize new data members GOT_, PLT_, GOT_PLT_, REL_DYN_, COPY_RELOCS_ and DYNBSS_. Declare new methods Target_arm::got_section, Target_arm::make_plt_entry and Target_arm::rel_dyn_section. Declare new_enum Target_arm::Got_type. Declare new data members GOT_, PLT_, GOT_PLT_, REL_DYN_, COPY_RELOCS_ and DYNBSS_. Update commments for member do_dynsym_value. (Target_arm::got_size, Target_arm::plt_section, Target_arm::may_need_copy_reloc and Target_arm::copy_reloc): Define new methods inside class defintion. (Target_arm::got_section): Define new method. (Target_arm::rel_dyn_section): Same. (Output_data_plt_arm): New template class. (Output_data_plt_arm::Output_data_plt_arm): Define constructor. (Output_data_plt_arm:do_adjust_output_section): Define new method. (Output_data_plt_arm::add_entry): Same. (Output_data_plt_arm::first_plt_entry): Define new static data member for PLT instruction template. (Output_data_plt_arm::plt_entry): Same. (Output_data_plt_arm::do_write): Define new method. (Target_arm::make_plt_entry): Same. (Target_arm::do_finalize_sections): Same. (Target_arm::do_dynsym_value): Same.
This commit is contained in:
Doug Kwan
parent
5a43797524
commit
94cdfcffc3
@ -1,3 +1,33 @@
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2009-05-29 Doug Kwan <dougkwan@google.com>
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* gold/arm.cc (Output_data_plt_arm): Forward declaration for new
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template class.
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(class Target_arm): Update comment.
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(Target_arm::Target_arm): Initialize new data members GOT_,
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PLT_, GOT_PLT_, REL_DYN_, COPY_RELOCS_ and DYNBSS_.
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Declare new methods Target_arm::got_section, Target_arm::make_plt_entry
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and Target_arm::rel_dyn_section.
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Declare new_enum Target_arm::Got_type.
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Declare new data members GOT_, PLT_, GOT_PLT_, REL_DYN_, COPY_RELOCS_
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and DYNBSS_.
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Update commments for member do_dynsym_value.
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(Target_arm::got_size, Target_arm::plt_section,
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Target_arm::may_need_copy_reloc and Target_arm::copy_reloc): Define
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new methods inside class defintion.
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(Target_arm::got_section): Define new method.
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(Target_arm::rel_dyn_section): Same.
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(Output_data_plt_arm): New template class.
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(Output_data_plt_arm::Output_data_plt_arm): Define constructor.
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(Output_data_plt_arm:do_adjust_output_section): Define new method.
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(Output_data_plt_arm::add_entry): Same.
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(Output_data_plt_arm::first_plt_entry): Define new
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static data member for PLT instruction template.
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(Output_data_plt_arm::plt_entry): Same.
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(Output_data_plt_arm::do_write): Define new method.
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(Target_arm::make_plt_entry): Same.
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(Target_arm::do_finalize_sections): Same.
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(Target_arm::do_dynsym_value): Same.
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2009-05-28 Doug Kwan <dougkwan@google.com>
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* Makefile.am (TARGETSOURCES): Add arm.cc.
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435
gold/arm.cc
435
gold/arm.cc
@ -48,6 +48,9 @@ namespace
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using namespace gold;
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template<bool big_endian>
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class Output_data_plt_arm;
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// The arm target class.
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//
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// This is a very simple port of gold for ARM-EABI. It is intended for
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@ -72,7 +75,6 @@ using namespace gold;
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// R_ARM_PREL31
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//
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// Coming soon (pending patches):
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// - Support for dynamic symbols (GOT, PLT and etc).
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// - Local scanner
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// - Global scanner
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// - Relocation
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@ -85,6 +87,8 @@ using namespace gold;
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// - Create a PT_ARM_EXIDX program header for a shared object that
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// might throw an exception.
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// - Support more relocation types as needed.
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// - Make PLTs more flexible for different architecture features like
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// Thumb-2 and BE8.
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template<bool big_endian>
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class Target_arm : public Sized_target<32, big_endian>
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@ -94,7 +98,9 @@ class Target_arm : public Sized_target<32, big_endian>
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Reloc_section;
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Target_arm()
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: Sized_target<32, big_endian>(&arm_info)
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: Sized_target<32, big_endian>(&arm_info),
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got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL),
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copy_relocs_(elfcpp::R_ARM_COPY), dynbss_(NULL)
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{ }
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// Process the relocations to determine unreferenced sections for
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@ -132,7 +138,7 @@ class Target_arm : public Sized_target<32, big_endian>
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void
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do_finalize_sections(Layout*);
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// Return the value to use for a dynamic which requires special
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// Return the value to use for a dynamic symbol which requires special
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// treatment.
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uint64_t
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do_dynsym_value(const Symbol*) const;
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@ -185,6 +191,14 @@ class Target_arm : public Sized_target<32, big_endian>
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do_is_defined_by_abi(Symbol* sym) const
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{ return strcmp(sym->name(), "__tls_get_addr") == 0; }
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// Return the size of the GOT section.
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section_size_type
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got_size()
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{
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gold_assert(this->got_ != NULL);
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return this->got_->data_size();
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}
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// Map platform-specific reloc types
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static unsigned int
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get_real_reloc_type (unsigned int r_type);
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@ -256,9 +270,80 @@ class Target_arm : public Sized_target<32, big_endian>
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get_size_for_reloc(unsigned int, Relobj*);
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};
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// Get the GOT section, creating it if necessary.
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Output_data_got<32, big_endian>*
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got_section(Symbol_table*, Layout*);
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// Get the GOT PLT section.
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Output_data_space*
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got_plt_section() const
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{
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gold_assert(this->got_plt_ != NULL);
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return this->got_plt_;
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}
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// Create a PLT entry for a global symbol.
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void
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make_plt_entry(Symbol_table*, Layout*, Symbol*);
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// Get the PLT section.
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const Output_data_plt_arm<big_endian>*
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plt_section() const
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{
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gold_assert(this->plt_ != NULL);
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return this->plt_;
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}
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// Get the dynamic reloc section, creating it if necessary.
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Reloc_section*
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rel_dyn_section(Layout*);
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// Return true if the symbol may need a COPY relocation.
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// References from an executable object to non-function symbols
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// defined in a dynamic object may need a COPY relocation.
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bool
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may_need_copy_reloc(Symbol* gsym)
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{
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return (!parameters->options().shared()
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&& gsym->is_from_dynobj()
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&& gsym->type() != elfcpp::STT_FUNC);
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}
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// Add a potential copy relocation.
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void
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copy_reloc(Symbol_table* symtab, Layout* layout,
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Sized_relobj<32, big_endian>* object,
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unsigned int shndx, Output_section* output_section,
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Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc)
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{
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this->copy_relocs_.copy_reloc(symtab, layout,
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symtab->get_sized_symbol<32>(sym),
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object, shndx, output_section, reloc,
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this->rel_dyn_section(layout));
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}
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// Information about this specific target which we pass to the
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// general Target structure.
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static const Target::Target_info arm_info;
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// The types of GOT entries needed for this platform.
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enum Got_type
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{
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GOT_TYPE_STANDARD = 0 // GOT entry for a regular symbol
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};
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// The GOT section.
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Output_data_got<32, big_endian>* got_;
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// The PLT section.
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Output_data_plt_arm<big_endian>* plt_;
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// The GOT PLT section.
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Output_data_space* got_plt_;
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// The dynamic reloc section.
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Reloc_section* rel_dyn_;
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// Relocs saved to avoid a COPY reloc.
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Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_;
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// Space for variables copied with a COPY reloc.
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Output_data_space* dynbss_;
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};
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template<bool big_endian>
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@ -278,6 +363,300 @@ const Target::Target_info Target_arm<big_endian>::arm_info =
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0x1000 // common_pagesize (overridable by -z common-page-size)
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};
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// Get the GOT section, creating it if necessary.
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template<bool big_endian>
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Output_data_got<32, big_endian>*
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Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout)
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{
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if (this->got_ == NULL)
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{
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gold_assert(symtab != NULL && layout != NULL);
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this->got_ = new Output_data_got<32, big_endian>();
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Output_section* os;
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os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
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(elfcpp::SHF_ALLOC
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| elfcpp::SHF_WRITE),
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this->got_);
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os->set_is_relro();
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// The old GNU linker creates a .got.plt section. We just
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// create another set of data in the .got section. Note that we
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// always create a PLT if we create a GOT, although the PLT
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// might be empty.
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this->got_plt_ = new Output_data_space(4, "** GOT PLT");
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os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
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(elfcpp::SHF_ALLOC
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| elfcpp::SHF_WRITE),
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this->got_plt_);
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os->set_is_relro();
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// The first three entries are reserved.
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this->got_plt_->set_current_data_size(3 * 4);
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// Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
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symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
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this->got_plt_,
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0, 0, elfcpp::STT_OBJECT,
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elfcpp::STB_LOCAL,
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elfcpp::STV_HIDDEN, 0,
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false, false);
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}
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return this->got_;
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}
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// Get the dynamic reloc section, creating it if necessary.
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template<bool big_endian>
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typename Target_arm<big_endian>::Reloc_section*
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Target_arm<big_endian>::rel_dyn_section(Layout* layout)
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{
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if (this->rel_dyn_ == NULL)
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{
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gold_assert(layout != NULL);
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this->rel_dyn_ = new Reloc_section(parameters->options().combreloc());
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layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
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elfcpp::SHF_ALLOC, this->rel_dyn_);
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}
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return this->rel_dyn_;
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}
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// A class to handle the PLT data.
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template<bool big_endian>
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class Output_data_plt_arm : public Output_section_data
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{
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public:
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typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian>
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Reloc_section;
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Output_data_plt_arm(Layout*, Output_data_space*);
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// Add an entry to the PLT.
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void
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add_entry(Symbol* gsym);
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// Return the .rel.plt section data.
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const Reloc_section*
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rel_plt() const
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{ return this->rel_; }
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protected:
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void
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do_adjust_output_section(Output_section* os);
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// Write to a map file.
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void
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do_print_to_mapfile(Mapfile* mapfile) const
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{ mapfile->print_output_data(this, _("** PLT")); }
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private:
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// Template for the first PLT entry.
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static const uint32_t first_plt_entry[5];
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// Template for subsequent PLT entries.
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static const uint32_t plt_entry[3];
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// Set the final size.
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void
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set_final_data_size()
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{
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this->set_data_size(sizeof(first_plt_entry)
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+ this->count_ * sizeof(plt_entry));
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}
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// Write out the PLT data.
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void
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do_write(Output_file*);
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// The reloc section.
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Reloc_section* rel_;
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// The .got.plt section.
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Output_data_space* got_plt_;
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// The number of PLT entries.
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unsigned int count_;
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};
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// Create the PLT section. The ordinary .got section is an argument,
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// since we need to refer to the start. We also create our own .got
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// section just for PLT entries.
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template<bool big_endian>
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Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout,
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Output_data_space* got_plt)
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: Output_section_data(4), got_plt_(got_plt), count_(0)
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{
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this->rel_ = new Reloc_section(false);
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layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
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elfcpp::SHF_ALLOC, this->rel_);
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}
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template<bool big_endian>
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void
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Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os)
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{
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os->set_entsize(0);
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}
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// Add an entry to the PLT.
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template<bool big_endian>
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void
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Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym)
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{
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gold_assert(!gsym->has_plt_offset());
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// Note that when setting the PLT offset we skip the initial
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// reserved PLT entry.
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gsym->set_plt_offset((this->count_) * sizeof(plt_entry)
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+ sizeof(first_plt_entry));
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++this->count_;
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section_offset_type got_offset = this->got_plt_->current_data_size();
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// Every PLT entry needs a GOT entry which points back to the PLT
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// entry (this will be changed by the dynamic linker, normally
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// lazily when the function is called).
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this->got_plt_->set_current_data_size(got_offset + 4);
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// Every PLT entry needs a reloc.
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gsym->set_needs_dynsym_entry();
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this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_,
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got_offset);
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// Note that we don't need to save the symbol. The contents of the
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// PLT are independent of which symbols are used. The symbols only
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// appear in the relocations.
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}
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// ARM PLTs.
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// FIXME: This is not very flexible. Right now this has only been tested
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// on armv5te. If we are to support additional architecture features like
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// Thumb-2 or BE8, we need to make this more flexible like GNU ld.
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// The first entry in the PLT.
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template<bool big_endian>
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const uint32_t Output_data_plt_arm<big_endian>::first_plt_entry[5] =
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{
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0xe52de004, // str lr, [sp, #-4]!
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0xe59fe004, // ldr lr, [pc, #4]
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0xe08fe00e, // add lr, pc, lr
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0xe5bef008, // ldr pc, [lr, #8]!
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0x00000000, // &GOT[0] - .
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};
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// Subsequent entries in the PLT.
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template<bool big_endian>
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const uint32_t Output_data_plt_arm<big_endian>::plt_entry[3] =
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{
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0xe28fc600, // add ip, pc, #0xNN00000
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0xe28cca00, // add ip, ip, #0xNN000
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0xe5bcf000, // ldr pc, [ip, #0xNNN]!
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};
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// Write out the PLT. This uses the hand-coded instructions above,
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// and adjusts them as needed. This is all specified by the arm ELF
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// Processor Supplement.
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template<bool big_endian>
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void
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Output_data_plt_arm<big_endian>::do_write(Output_file* of)
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{
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const off_t offset = this->offset();
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const section_size_type oview_size =
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convert_to_section_size_type(this->data_size());
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unsigned char* const oview = of->get_output_view(offset, oview_size);
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const off_t got_file_offset = this->got_plt_->offset();
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const section_size_type got_size =
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convert_to_section_size_type(this->got_plt_->data_size());
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unsigned char* const got_view = of->get_output_view(got_file_offset,
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got_size);
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unsigned char* pov = oview;
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elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address();
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elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address();
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// Write first PLT entry. All but the last word are constants.
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const size_t num_first_plt_words = (sizeof(first_plt_entry)
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/ sizeof(plt_entry[0]));
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for (size_t i = 0; i < num_first_plt_words - 1; i++)
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elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]);
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// Last word in first PLT entry is &GOT[0] - .
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elfcpp::Swap<32, big_endian>::writeval(pov + 16,
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got_address - (plt_address + 16));
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pov += sizeof(first_plt_entry);
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unsigned char* got_pov = got_view;
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memset(got_pov, 0, 12);
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got_pov += 12;
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const int rel_size = elfcpp::Elf_sizes<32>::rel_size;
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unsigned int plt_offset = sizeof(first_plt_entry);
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unsigned int plt_rel_offset = 0;
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unsigned int got_offset = 12;
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const unsigned int count = this->count_;
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for (unsigned int i = 0;
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i < count;
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++i,
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pov += sizeof(plt_entry),
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got_pov += 4,
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plt_offset += sizeof(plt_entry),
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plt_rel_offset += rel_size,
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got_offset += 4)
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{
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// Set and adjust the PLT entry itself.
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||||
int32_t offset = ((got_address + got_offset)
|
||||
- (plt_address + plt_offset + 8));
|
||||
|
||||
gold_assert(offset >= 0 && offset < 0x0fffffff);
|
||||
uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff);
|
||||
elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0);
|
||||
uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff);
|
||||
elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1);
|
||||
uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff);
|
||||
elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2);
|
||||
|
||||
// Set the entry in the GOT.
|
||||
elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address);
|
||||
}
|
||||
|
||||
gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
|
||||
gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
|
||||
|
||||
of->write_output_view(offset, oview_size, oview);
|
||||
of->write_output_view(got_file_offset, got_size, got_view);
|
||||
}
|
||||
|
||||
// Create a PLT entry for a global symbol.
|
||||
|
||||
template<bool big_endian>
|
||||
void
|
||||
Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout,
|
||||
Symbol* gsym)
|
||||
{
|
||||
if (gsym->has_plt_offset())
|
||||
return;
|
||||
|
||||
if (this->plt_ == NULL)
|
||||
{
|
||||
// Create the GOT sections first.
|
||||
this->got_section(symtab, layout);
|
||||
|
||||
this->plt_ = new Output_data_plt_arm<big_endian>(layout, this->got_plt_);
|
||||
layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
|
||||
(elfcpp::SHF_ALLOC
|
||||
| elfcpp::SHF_EXECINSTR),
|
||||
this->plt_);
|
||||
}
|
||||
this->plt_->add_entry(gsym);
|
||||
}
|
||||
|
||||
// Report an unsupported relocation against a local symbol.
|
||||
|
||||
template<bool big_endian>
|
||||
@ -436,9 +815,44 @@ Target_arm<big_endian>::scan_relocs(const General_options& options,
|
||||
|
||||
template<bool big_endian>
|
||||
void
|
||||
Target_arm<big_endian>::do_finalize_sections(Layout* /* layout */)
|
||||
Target_arm<big_endian>::do_finalize_sections(Layout* layout)
|
||||
{
|
||||
gold_unreachable ();
|
||||
// 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 (!parameters->options().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_.any_saved_relocs())
|
||||
this->copy_relocs_.emit(this->rel_dyn_section(layout));
|
||||
}
|
||||
|
||||
// Perform a relocation.
|
||||
@ -621,12 +1035,17 @@ Target_arm<big_endian>::relocate_for_relocatable(
|
||||
reloc_view_size);
|
||||
}
|
||||
|
||||
// Return the value to use for a dynamic symbol which requires special
|
||||
// treatment. This is how we support equality comparisons of function
|
||||
// pointers across shared library boundaries, as described in the
|
||||
// processor specific ABI supplement.
|
||||
|
||||
template<bool big_endian>
|
||||
uint64_t
|
||||
Target_arm<big_endian>::do_dynsym_value(const Symbol* /*gsym*/) const
|
||||
Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const
|
||||
{
|
||||
gold_unreachable ();
|
||||
return 0;
|
||||
gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
|
||||
return this->plt_section()->address() + gsym->plt_offset();
|
||||
}
|
||||
|
||||
// Map platform-specific relocs to real relocs
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user