| // aarch64.cc -- aarch64 target support for gold. |
| |
| // Copyright (C) 2014 Free Software Foundation, Inc. |
| // Written by Jing Yu <jingyu@google.com> and Han Shen <shenhan@google.com>. |
| |
| // This file is part of gold. |
| |
| // This program is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License as published by |
| // the Free Software Foundation; either version 3 of the License, or |
| // (at your option) any later version. |
| |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| // MA 02110-1301, USA. |
| |
| #include "gold.h" |
| |
| #include <cstring> |
| |
| #include "elfcpp.h" |
| #include "dwarf.h" |
| #include "parameters.h" |
| #include "reloc.h" |
| #include "aarch64.h" |
| #include "object.h" |
| #include "symtab.h" |
| #include "layout.h" |
| #include "output.h" |
| #include "copy-relocs.h" |
| #include "target.h" |
| #include "target-reloc.h" |
| #include "target-select.h" |
| #include "tls.h" |
| #include "freebsd.h" |
| #include "nacl.h" |
| #include "gc.h" |
| #include "icf.h" |
| #include "aarch64-reloc-property.h" |
| |
| // The first three .got.plt entries are reserved. |
| const int32_t AARCH64_GOTPLT_RESERVE_COUNT = 3; |
| |
| namespace |
| { |
| |
| using namespace gold; |
| |
| template<int size, bool big_endian> |
| class Output_data_plt_aarch64; |
| |
| template<int size, bool big_endian> |
| class Output_data_plt_aarch64_standard; |
| |
| template<int size, bool big_endian> |
| class Target_aarch64; |
| |
| template<int size, bool big_endian> |
| class AArch64_relocate_functions; |
| |
| // Output_data_got_aarch64 class. |
| |
| template<int size, bool big_endian> |
| class Output_data_got_aarch64 : public Output_data_got<size, big_endian> |
| { |
| public: |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; |
| Output_data_got_aarch64(Symbol_table* symtab, Layout* layout) |
| : Output_data_got<size, big_endian>(), |
| symbol_table_(symtab), layout_(layout) |
| { } |
| |
| // Add a static entry for the GOT entry at OFFSET. GSYM is a global |
| // symbol and R_TYPE is the code of a dynamic relocation that needs to be |
| // applied in a static link. |
| void |
| add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) |
| { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); } |
| |
| |
| // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object |
| // defining a local symbol with INDEX. R_TYPE is the code of a dynamic |
| // relocation that needs to be applied in a static link. |
| void |
| add_static_reloc(unsigned int got_offset, unsigned int r_type, |
| Sized_relobj_file<size, big_endian>* relobj, |
| unsigned int index) |
| { |
| this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj, |
| index)); |
| } |
| |
| |
| protected: |
| // Write out the GOT table. |
| void |
| do_write(Output_file* of) { |
| // The first entry in the GOT is the address of the .dynamic section. |
| gold_assert(this->data_size() >= size / 8); |
| Output_section* dynamic = this->layout_->dynamic_section(); |
| Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); |
| this->replace_constant(0, dynamic_addr); |
| Output_data_got<size, big_endian>::do_write(of); |
| |
| // Handling static relocs |
| if (this->static_relocs_.empty()) |
| return; |
| |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| |
| gold_assert(parameters->doing_static_link()); |
| const off_t offset = this->offset(); |
| const section_size_type oview_size = |
| convert_to_section_size_type(this->data_size()); |
| unsigned char* const oview = of->get_output_view(offset, oview_size); |
| |
| Output_segment* tls_segment = this->layout_->tls_segment(); |
| gold_assert(tls_segment != NULL); |
| |
| AArch64_address aligned_tcb_address = |
| align_address(Target_aarch64<size,big_endian>::TCB_SIZE, |
| tls_segment->maximum_alignment()); |
| |
| for (size_t i = 0; i < this->static_relocs_.size(); ++i) |
| { |
| Static_reloc& reloc(this->static_relocs_[i]); |
| AArch64_address value; |
| |
| if (!reloc.symbol_is_global()) |
| { |
| Sized_relobj_file<size, big_endian>* object = reloc.relobj(); |
| const Symbol_value<size>* psymval = |
| reloc.relobj()->local_symbol(reloc.index()); |
| |
| // We are doing static linking. Issue an error and skip this |
| // relocation if the symbol is undefined or in a discarded_section. |
| bool is_ordinary; |
| unsigned int shndx = psymval->input_shndx(&is_ordinary); |
| if ((shndx == elfcpp::SHN_UNDEF) |
| || (is_ordinary |
| && shndx != elfcpp::SHN_UNDEF |
| && !object->is_section_included(shndx) |
| && !this->symbol_table_->is_section_folded(object, shndx))) |
| { |
| gold_error(_("undefined or discarded local symbol %u from " |
| " object %s in GOT"), |
| reloc.index(), reloc.relobj()->name().c_str()); |
| continue; |
| } |
| value = psymval->value(object, 0); |
| } |
| else |
| { |
| const Symbol* gsym = reloc.symbol(); |
| gold_assert(gsym != NULL); |
| if (gsym->is_forwarder()) |
| gsym = this->symbol_table_->resolve_forwards(gsym); |
| |
| // We are doing static linking. Issue an error and skip this |
| // relocation if the symbol is undefined or in a discarded_section |
| // unless it is a weakly_undefined symbol. |
| if ((gsym->is_defined_in_discarded_section() |
| || gsym->is_undefined()) |
| && !gsym->is_weak_undefined()) |
| { |
| gold_error(_("undefined or discarded symbol %s in GOT"), |
| gsym->name()); |
| continue; |
| } |
| |
| if (!gsym->is_weak_undefined()) |
| { |
| const Sized_symbol<size>* sym = |
| static_cast<const Sized_symbol<size>*>(gsym); |
| value = sym->value(); |
| } |
| else |
| value = 0; |
| } |
| |
| unsigned got_offset = reloc.got_offset(); |
| gold_assert(got_offset < oview_size); |
| |
| typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; |
| Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset); |
| Valtype x; |
| switch (reloc.r_type()) |
| { |
| case elfcpp::R_AARCH64_TLS_DTPREL64: |
| x = value; |
| break; |
| case elfcpp::R_AARCH64_TLS_TPREL64: |
| x = value + aligned_tcb_address; |
| break; |
| default: |
| gold_unreachable(); |
| } |
| elfcpp::Swap<size, big_endian>::writeval(wv, x); |
| } |
| |
| of->write_output_view(offset, oview_size, oview); |
| } |
| |
| private: |
| // Symbol table of the output object. |
| Symbol_table* symbol_table_; |
| // A pointer to the Layout class, so that we can find the .dynamic |
| // section when we write out the GOT section. |
| Layout* layout_; |
| |
| // This class represent dynamic relocations that need to be applied by |
| // gold because we are using TLS relocations in a static link. |
| class Static_reloc |
| { |
| public: |
| Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) |
| : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true) |
| { this->u_.global.symbol = gsym; } |
| |
| Static_reloc(unsigned int got_offset, unsigned int r_type, |
| Sized_relobj_file<size, big_endian>* relobj, unsigned int index) |
| : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false) |
| { |
| this->u_.local.relobj = relobj; |
| this->u_.local.index = index; |
| } |
| |
| // Return the GOT offset. |
| unsigned int |
| got_offset() const |
| { return this->got_offset_; } |
| |
| // Relocation type. |
| unsigned int |
| r_type() const |
| { return this->r_type_; } |
| |
| // Whether the symbol is global or not. |
| bool |
| symbol_is_global() const |
| { return this->symbol_is_global_; } |
| |
| // For a relocation against a global symbol, the global symbol. |
| Symbol* |
| symbol() const |
| { |
| gold_assert(this->symbol_is_global_); |
| return this->u_.global.symbol; |
| } |
| |
| // For a relocation against a local symbol, the defining object. |
| Sized_relobj_file<size, big_endian>* |
| relobj() const |
| { |
| gold_assert(!this->symbol_is_global_); |
| return this->u_.local.relobj; |
| } |
| |
| // For a relocation against a local symbol, the local symbol index. |
| unsigned int |
| index() const |
| { |
| gold_assert(!this->symbol_is_global_); |
| return this->u_.local.index; |
| } |
| |
| private: |
| // GOT offset of the entry to which this relocation is applied. |
| unsigned int got_offset_; |
| // Type of relocation. |
| unsigned int r_type_; |
| // Whether this relocation is against a global symbol. |
| bool symbol_is_global_; |
| // A global or local symbol. |
| union |
| { |
| struct |
| { |
| // For a global symbol, the symbol itself. |
| Symbol* symbol; |
| } global; |
| struct |
| { |
| // For a local symbol, the object defining object. |
| Sized_relobj_file<size, big_endian>* relobj; |
| // For a local symbol, the symbol index. |
| unsigned int index; |
| } local; |
| } u_; |
| }; // End of inner class Static_reloc |
| |
| std::vector<Static_reloc> static_relocs_; |
| }; // End of Output_data_got_aarch64 |
| |
| |
| AArch64_reloc_property_table* aarch64_reloc_property_table = NULL; |
| |
| |
| // The aarch64 target class. |
| // See the ABI at |
| // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf |
| template<int size, bool big_endian> |
| class Target_aarch64 : public Sized_target<size, big_endian> |
| { |
| public: |
| typedef Target_aarch64<size,big_endian> This; |
| typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| Reloc_section; |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| const static int TCB_SIZE = size / 8 * 2; |
| |
| Target_aarch64(const Target::Target_info* info = &aarch64_info) |
| : Sized_target<size, big_endian>(info), |
| got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
| got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), |
| rela_irelative_(NULL), copy_relocs_(elfcpp::R_AARCH64_COPY), |
| got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
| tls_base_symbol_defined_(false) |
| { } |
| |
| // Scan the relocations to determine unreferenced sections for |
| // garbage collection. |
| void |
| gc_process_relocs(Symbol_table* symtab, |
| Layout* layout, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| bool needs_special_offset_handling, |
| size_t local_symbol_count, |
| const unsigned char* plocal_symbols); |
| |
| // Scan the relocations to look for symbol adjustments. |
| void |
| scan_relocs(Symbol_table* symtab, |
| Layout* layout, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| bool needs_special_offset_handling, |
| size_t local_symbol_count, |
| const unsigned char* plocal_symbols); |
| |
| // Finalize the sections. |
| void |
| do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
| |
| // Return the value to use for a dynamic which requires special |
| // treatment. |
| uint64_t |
| do_dynsym_value(const Symbol*) const; |
| |
| // Relocate a section. |
| void |
| relocate_section(const Relocate_info<size, big_endian>*, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| bool needs_special_offset_handling, |
| unsigned char* view, |
| typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| section_size_type view_size, |
| const Reloc_symbol_changes*); |
| |
| // Scan the relocs during a relocatable link. |
| void |
| scan_relocatable_relocs(Symbol_table* symtab, |
| Layout* layout, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| bool needs_special_offset_handling, |
| size_t local_symbol_count, |
| const unsigned char* plocal_symbols, |
| Relocatable_relocs*); |
| |
| // Relocate a section during a relocatable link. |
| void |
| relocate_relocs( |
| const Relocate_info<size, big_endian>*, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| const Relocatable_relocs*, |
| unsigned char* view, |
| typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| section_size_type view_size, |
| unsigned char* reloc_view, |
| section_size_type reloc_view_size); |
| |
| // Return the symbol index to use for a target specific relocation. |
| // The only target specific relocation is R_AARCH64_TLSDESC for a |
| // local symbol, which is an absolute reloc. |
| unsigned int |
| do_reloc_symbol_index(void*, unsigned int r_type) const |
| { |
| gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); |
| return 0; |
| } |
| |
| // Return the addend to use for a target specific relocation. |
| typename elfcpp::Elf_types<size>::Elf_Addr |
| do_reloc_addend(void* arg, unsigned int r_type, |
| typename elfcpp::Elf_types<size>::Elf_Addr addend) const; |
| |
| // Return the PLT section. |
| uint64_t |
| do_plt_address_for_global(const Symbol* gsym) const |
| { return this->plt_section()->address_for_global(gsym); } |
| |
| uint64_t |
| do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const |
| { return this->plt_section()->address_for_local(relobj, symndx); } |
| |
| // Return the number of entries in the PLT. |
| unsigned int |
| plt_entry_count() const; |
| |
| //Return the offset of the first non-reserved PLT entry. |
| unsigned int |
| first_plt_entry_offset() const; |
| |
| // Return the size of each PLT entry. |
| unsigned int |
| plt_entry_size() const; |
| |
| unsigned int |
| tcb_size() const { return This::TCB_SIZE; } |
| |
| protected: |
| void |
| do_select_as_default_target() |
| { |
| gold_assert(aarch64_reloc_property_table == NULL); |
| aarch64_reloc_property_table = new AArch64_reloc_property_table(); |
| } |
| |
| // Add a new reloc argument, returning the index in the vector. |
| size_t |
| add_tlsdesc_info(Sized_relobj_file<size, big_endian>* object, |
| unsigned int r_sym) |
| { |
| this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); |
| return this->tlsdesc_reloc_info_.size() - 1; |
| } |
| |
| virtual Output_data_plt_aarch64<size, big_endian>* |
| do_make_data_plt(Layout* layout, |
| Output_data_got_aarch64<size, big_endian>* got, |
| Output_data_space* got_plt, |
| Output_data_space* got_irelative) |
| { |
| return new Output_data_plt_aarch64_standard<size, big_endian>( |
| layout, got, got_plt, got_irelative); |
| } |
| |
| Output_data_plt_aarch64<size, big_endian>* |
| make_data_plt(Layout* layout, |
| Output_data_got_aarch64<size, big_endian>* got, |
| Output_data_space* got_plt, |
| Output_data_space* got_irelative) |
| { |
| return this->do_make_data_plt(layout, got, got_plt, got_irelative); |
| } |
| |
| private: |
| // The class which scans relocations. |
| class Scan |
| { |
| public: |
| Scan() |
| : issued_non_pic_error_(false) |
| { } |
| |
| inline void |
| local(Symbol_table* symtab, Layout* layout, Target_aarch64* target, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| Output_section* output_section, |
| const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| const elfcpp::Sym<size, big_endian>& lsym, |
| bool is_discarded); |
| |
| inline void |
| global(Symbol_table* symtab, Layout* layout, Target_aarch64* target, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| Output_section* output_section, |
| const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| Symbol* gsym); |
| |
| inline bool |
| local_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| Target_aarch64<size, big_endian>* , |
| Sized_relobj_file<size, big_endian>* , |
| unsigned int , |
| Output_section* , |
| const elfcpp::Rela<size, big_endian>& , |
| unsigned int r_type, |
| const elfcpp::Sym<size, big_endian>&); |
| |
| inline bool |
| global_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| Target_aarch64<size, big_endian>* , |
| Sized_relobj_file<size, big_endian>* , |
| unsigned int , |
| Output_section* , |
| const elfcpp::Rela<size, big_endian>& , |
| unsigned int r_type, |
| Symbol* gsym); |
| |
| private: |
| static void |
| unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, |
| unsigned int r_type); |
| |
| static void |
| unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, |
| unsigned int r_type, Symbol*); |
| |
| inline bool |
| possible_function_pointer_reloc(unsigned int r_type); |
| |
| void |
| check_non_pic(Relobj*, unsigned int r_type); |
| |
| // Whether we have issued an error about a non-PIC compilation. |
| bool issued_non_pic_error_; |
| }; |
| |
| // The class which implements relocation. |
| class Relocate |
| { |
| public: |
| Relocate() |
| : skip_call_tls_get_addr_(false) |
| { } |
| |
| ~Relocate() |
| { } |
| |
| // Do a relocation. Return false if the caller should not issue |
| // any warnings about this relocation. |
| inline bool |
| relocate(const Relocate_info<size, big_endian>*, Target_aarch64*, |
| Output_section*, |
| size_t relnum, const elfcpp::Rela<size, big_endian>&, |
| unsigned int r_type, const Sized_symbol<size>*, |
| const Symbol_value<size>*, |
| unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
| section_size_type); |
| |
| private: |
| inline typename AArch64_relocate_functions<size,big_endian>::Status |
| relocate_tls(const Relocate_info<size,big_endian>*, |
| Target_aarch64<size, big_endian>*, |
| size_t, |
| const elfcpp::Rela<size, big_endian>&, |
| unsigned int r_type, const Sized_symbol<size>*, |
| const Symbol_value<size>*, |
| unsigned char*, |
| typename elfcpp::Elf_types<size>::Elf_Addr); |
| |
| inline typename AArch64_relocate_functions<size,big_endian>::Status |
| tls_gd_to_le( |
| const Relocate_info<size,big_endian>*, |
| Target_aarch64<size, big_endian>*, |
| const elfcpp::Rela<size, big_endian>&, |
| unsigned int, |
| unsigned char*, |
| const Symbol_value<size>*); |
| |
| inline typename AArch64_relocate_functions<size,big_endian>::Status |
| tls_ie_to_le( |
| const Relocate_info<size,big_endian>*, |
| Target_aarch64<size, big_endian>*, |
| const elfcpp::Rela<size, big_endian>&, |
| unsigned int, |
| unsigned char*, |
| const Symbol_value<size>*); |
| |
| inline typename AArch64_relocate_functions<size,big_endian>::Status |
| tls_desc_gd_to_le( |
| const Relocate_info<size,big_endian>*, |
| Target_aarch64<size, big_endian>*, |
| const elfcpp::Rela<size, big_endian>&, |
| unsigned int, |
| unsigned char*, |
| const Symbol_value<size>*); |
| |
| inline typename AArch64_relocate_functions<size,big_endian>::Status |
| tls_desc_gd_to_ie( |
| const Relocate_info<size,big_endian>*, |
| Target_aarch64<size, big_endian>*, |
| const elfcpp::Rela<size, big_endian>&, |
| unsigned int, |
| unsigned char*, |
| const Symbol_value<size>*, |
| typename elfcpp::Elf_types<size>::Elf_Addr, |
| typename elfcpp::Elf_types<size>::Elf_Addr); |
| |
| bool skip_call_tls_get_addr_; |
| |
| }; // End of class Relocate |
| |
| // A class which returns the size required for a relocation type, |
| // used while scanning relocs during a relocatable link. |
| class Relocatable_size_for_reloc |
| { |
| public: |
| unsigned int |
| get_size_for_reloc(unsigned int, Relobj*); |
| }; |
| |
| // Adjust TLS relocation type based on the options and whether this |
| // is a local symbol. |
| static tls::Tls_optimization |
| optimize_tls_reloc(bool is_final, int r_type); |
| |
| // Get the GOT section, creating it if necessary. |
| Output_data_got_aarch64<size, big_endian>* |
| got_section(Symbol_table*, Layout*); |
| |
| // Get the GOT PLT section. |
| Output_data_space* |
| got_plt_section() const |
| { |
| gold_assert(this->got_plt_ != NULL); |
| return this->got_plt_; |
| } |
| |
| // Get the GOT section for TLSDESC entries. |
| Output_data_got<size, big_endian>* |
| got_tlsdesc_section() const |
| { |
| gold_assert(this->got_tlsdesc_ != NULL); |
| return this->got_tlsdesc_; |
| } |
| |
| // Create the PLT section. |
| void |
| make_plt_section(Symbol_table* symtab, Layout* layout); |
| |
| // Create a PLT entry for a global symbol. |
| void |
| make_plt_entry(Symbol_table*, Layout*, Symbol*); |
| |
| // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
| void |
| make_local_ifunc_plt_entry(Symbol_table*, Layout*, |
| Sized_relobj_file<size, big_endian>* relobj, |
| unsigned int local_sym_index); |
| |
| // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
| void |
| define_tls_base_symbol(Symbol_table*, Layout*); |
| |
| // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
| void |
| reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); |
| |
| // Create a GOT entry for the TLS module index. |
| unsigned int |
| got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
| Sized_relobj_file<size, big_endian>* object); |
| |
| // Get the PLT section. |
| Output_data_plt_aarch64<size, big_endian>* |
| plt_section() const |
| { |
| gold_assert(this->plt_ != NULL); |
| return this->plt_; |
| } |
| |
| // Get the dynamic reloc section, creating it if necessary. |
| Reloc_section* |
| rela_dyn_section(Layout*); |
| |
| // Get the section to use for TLSDESC relocations. |
| Reloc_section* |
| rela_tlsdesc_section(Layout*) const; |
| |
| // Get the section to use for IRELATIVE relocations. |
| Reloc_section* |
| rela_irelative_section(Layout*); |
| |
| // Add a potential copy relocation. |
| void |
| copy_reloc(Symbol_table* symtab, Layout* layout, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int shndx, Output_section* output_section, |
| Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) |
| { |
| this->copy_relocs_.copy_reloc(symtab, layout, |
| symtab->get_sized_symbol<size>(sym), |
| object, shndx, output_section, |
| reloc, this->rela_dyn_section(layout)); |
| } |
| |
| // Information about this specific target which we pass to the |
| // general Target structure. |
| static const Target::Target_info aarch64_info; |
| |
| // The types of GOT entries needed for this platform. |
| // These values are exposed to the ABI in an incremental link. |
| // Do not renumber existing values without changing the version |
| // number of the .gnu_incremental_inputs section. |
| enum Got_type |
| { |
| GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol |
| GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset |
| GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair |
| GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair |
| }; |
| |
| // This type is used as the argument to the target specific |
| // relocation routines. The only target specific reloc is |
| // R_AARCh64_TLSDESC against a local symbol. |
| struct Tlsdesc_info |
| { |
| Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object, |
| unsigned int a_r_sym) |
| : object(a_object), r_sym(a_r_sym) |
| { } |
| |
| // The object in which the local symbol is defined. |
| Sized_relobj_file<size, big_endian>* object; |
| // The local symbol index in the object. |
| unsigned int r_sym; |
| }; |
| |
| // The GOT section. |
| Output_data_got_aarch64<size, big_endian>* got_; |
| // The PLT section. |
| Output_data_plt_aarch64<size, big_endian>* plt_; |
| // The GOT PLT section. |
| Output_data_space* got_plt_; |
| // The GOT section for IRELATIVE relocations. |
| Output_data_space* got_irelative_; |
| // The GOT section for TLSDESC relocations. |
| Output_data_got<size, big_endian>* got_tlsdesc_; |
| // The _GLOBAL_OFFSET_TABLE_ symbol. |
| Symbol* global_offset_table_; |
| // The dynamic reloc section. |
| Reloc_section* rela_dyn_; |
| // The section to use for IRELATIVE relocs. |
| Reloc_section* rela_irelative_; |
| // Relocs saved to avoid a COPY reloc. |
| Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; |
| // Offset of the GOT entry for the TLS module index. |
| unsigned int got_mod_index_offset_; |
| // We handle R_AARCH64_TLSDESC against a local symbol as a target |
| // specific relocation. Here we store the object and local symbol |
| // index for the relocation. |
| std::vector<Tlsdesc_info> tlsdesc_reloc_info_; |
| // True if the _TLS_MODULE_BASE_ symbol has been defined. |
| bool tls_base_symbol_defined_; |
| }; // End of Target_aarch64 |
| |
| |
| template<> |
| const Target::Target_info Target_aarch64<64, false>::aarch64_info = |
| { |
| 64, // size |
| false, // is_big_endian |
| elfcpp::EM_AARCH64, // machine_code |
| false, // has_make_symbol |
| false, // has_resolve |
| false, // has_code_fill |
| true, // is_default_stack_executable |
| false, // can_icf_inline_merge_sections |
| '\0', // wrap_char |
| "/lib/ld.so.1", // program interpreter |
| 0x400000, // default_text_segment_address |
| 0x1000, // abi_pagesize (overridable by -z max-page-size) |
| 0x1000, // common_pagesize (overridable by -z common-page-size) |
| false, // isolate_execinstr |
| 0, // rosegment_gap |
| elfcpp::SHN_UNDEF, // small_common_shndx |
| elfcpp::SHN_UNDEF, // large_common_shndx |
| 0, // small_common_section_flags |
| 0, // large_common_section_flags |
| NULL, // attributes_section |
| NULL, // attributes_vendor |
| "_start" // entry_symbol_name |
| }; |
| |
| template<> |
| const Target::Target_info Target_aarch64<32, false>::aarch64_info = |
| { |
| 32, // size |
| false, // is_big_endian |
| elfcpp::EM_AARCH64, // machine_code |
| false, // has_make_symbol |
| false, // has_resolve |
| false, // has_code_fill |
| true, // is_default_stack_executable |
| false, // can_icf_inline_merge_sections |
| '\0', // wrap_char |
| "/lib/ld.so.1", // program interpreter |
| 0x400000, // default_text_segment_address |
| 0x1000, // abi_pagesize (overridable by -z max-page-size) |
| 0x1000, // common_pagesize (overridable by -z common-page-size) |
| false, // isolate_execinstr |
| 0, // rosegment_gap |
| elfcpp::SHN_UNDEF, // small_common_shndx |
| elfcpp::SHN_UNDEF, // large_common_shndx |
| 0, // small_common_section_flags |
| 0, // large_common_section_flags |
| NULL, // attributes_section |
| NULL, // attributes_vendor |
| "_start" // entry_symbol_name |
| }; |
| |
| template<> |
| const Target::Target_info Target_aarch64<64, true>::aarch64_info = |
| { |
| 64, // size |
| true, // is_big_endian |
| elfcpp::EM_AARCH64, // machine_code |
| false, // has_make_symbol |
| false, // has_resolve |
| false, // has_code_fill |
| true, // is_default_stack_executable |
| false, // can_icf_inline_merge_sections |
| '\0', // wrap_char |
| "/lib/ld.so.1", // program interpreter |
| 0x400000, // default_text_segment_address |
| 0x1000, // abi_pagesize (overridable by -z max-page-size) |
| 0x1000, // common_pagesize (overridable by -z common-page-size) |
| false, // isolate_execinstr |
| 0, // rosegment_gap |
| elfcpp::SHN_UNDEF, // small_common_shndx |
| elfcpp::SHN_UNDEF, // large_common_shndx |
| 0, // small_common_section_flags |
| 0, // large_common_section_flags |
| NULL, // attributes_section |
| NULL, // attributes_vendor |
| "_start" // entry_symbol_name |
| }; |
| |
| template<> |
| const Target::Target_info Target_aarch64<32, true>::aarch64_info = |
| { |
| 32, // size |
| true, // is_big_endian |
| elfcpp::EM_AARCH64, // machine_code |
| false, // has_make_symbol |
| false, // has_resolve |
| false, // has_code_fill |
| true, // is_default_stack_executable |
| false, // can_icf_inline_merge_sections |
| '\0', // wrap_char |
| "/lib/ld.so.1", // program interpreter |
| 0x400000, // default_text_segment_address |
| 0x1000, // abi_pagesize (overridable by -z max-page-size) |
| 0x1000, // common_pagesize (overridable by -z common-page-size) |
| false, // isolate_execinstr |
| 0, // rosegment_gap |
| elfcpp::SHN_UNDEF, // small_common_shndx |
| elfcpp::SHN_UNDEF, // large_common_shndx |
| 0, // small_common_section_flags |
| 0, // large_common_section_flags |
| NULL, // attributes_section |
| NULL, // attributes_vendor |
| "_start" // entry_symbol_name |
| }; |
| |
| // Get the GOT section, creating it if necessary. |
| |
| template<int size, bool big_endian> |
| Output_data_got_aarch64<size, big_endian>* |
| Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab, |
| Layout* layout) |
| { |
| if (this->got_ == NULL) |
| { |
| gold_assert(symtab != NULL && layout != NULL); |
| |
| // When using -z now, we can treat .got.plt as a relro section. |
| // Without -z now, it is modified after program startup by lazy |
| // PLT relocations. |
| bool is_got_plt_relro = parameters->options().now(); |
| Output_section_order got_order = (is_got_plt_relro |
| ? ORDER_RELRO |
| : ORDER_RELRO_LAST); |
| Output_section_order got_plt_order = (is_got_plt_relro |
| ? ORDER_RELRO |
| : ORDER_NON_RELRO_FIRST); |
| |
| // Layout of .got and .got.plt sections. |
| // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_ |
| // ... |
| // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT |
| // .gotplt[1] reserved for ld.so (resolver) |
| // .gotplt[2] reserved |
| |
| // Generate .got section. |
| this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab, |
| layout); |
| layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
| this->got_, got_order, true); |
| // The first word of GOT is reserved for the address of .dynamic. |
| // We put 0 here now. The value will be replaced later in |
| // Output_data_got_aarch64::do_write. |
| this->got_->add_constant(0); |
| |
| // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
| // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section, |
| // even if there is a .got.plt section. |
| this->global_offset_table_ = |
| symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| Symbol_table::PREDEFINED, |
| this->got_, |
| 0, 0, elfcpp::STT_OBJECT, |
| elfcpp::STB_LOCAL, |
| elfcpp::STV_HIDDEN, 0, |
| false, false); |
| |
| // Generate .got.plt section. |
| this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT"); |
| layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| (elfcpp::SHF_ALLOC |
| | elfcpp::SHF_WRITE), |
| this->got_plt_, got_plt_order, |
| is_got_plt_relro); |
| |
| // The first three entries are reserved. |
| this->got_plt_->set_current_data_size( |
| AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); |
| |
| // If there are any IRELATIVE relocations, they get GOT entries |
| // in .got.plt after the jump slot entries. |
| this->got_irelative_ = new Output_data_space(size / 8, |
| "** GOT IRELATIVE PLT"); |
| layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| (elfcpp::SHF_ALLOC |
| | elfcpp::SHF_WRITE), |
| this->got_irelative_, |
| got_plt_order, |
| is_got_plt_relro); |
| |
| // If there are any TLSDESC relocations, they get GOT entries in |
| // .got.plt after the jump slot and IRELATIVE entries. |
| this->got_tlsdesc_ = new Output_data_got<size, big_endian>(); |
| layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| (elfcpp::SHF_ALLOC |
| | elfcpp::SHF_WRITE), |
| this->got_tlsdesc_, |
| got_plt_order, |
| is_got_plt_relro); |
| |
| if (!is_got_plt_relro) |
| { |
| // Those bytes can go into the relro segment. |
| layout->increase_relro( |
| AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); |
| } |
| |
| } |
| return this->got_; |
| } |
| |
| // Get the dynamic reloc section, creating it if necessary. |
| |
| template<int size, bool big_endian> |
| typename Target_aarch64<size, big_endian>::Reloc_section* |
| Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout) |
| { |
| if (this->rela_dyn_ == NULL) |
| { |
| gold_assert(layout != NULL); |
| this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
| layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| elfcpp::SHF_ALLOC, this->rela_dyn_, |
| ORDER_DYNAMIC_RELOCS, false); |
| } |
| return this->rela_dyn_; |
| } |
| |
| // Get the section to use for IRELATIVE relocs, creating it if |
| // necessary. These go in .rela.dyn, but only after all other dynamic |
| // relocations. They need to follow the other dynamic relocations so |
| // that they can refer to global variables initialized by those |
| // relocs. |
| |
| template<int size, bool big_endian> |
| typename Target_aarch64<size, big_endian>::Reloc_section* |
| Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout) |
| { |
| if (this->rela_irelative_ == NULL) |
| { |
| // Make sure we have already created the dynamic reloc section. |
| this->rela_dyn_section(layout); |
| this->rela_irelative_ = new Reloc_section(false); |
| layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| elfcpp::SHF_ALLOC, this->rela_irelative_, |
| ORDER_DYNAMIC_RELOCS, false); |
| gold_assert(this->rela_dyn_->output_section() |
| == this->rela_irelative_->output_section()); |
| } |
| return this->rela_irelative_; |
| } |
| |
| |
| // A class to handle the PLT data. |
| // This is an abstract base class that handles most of the linker details |
| // but does not know the actual contents of PLT entries. The derived |
| // classes below fill in those details. |
| |
| template<int size, bool big_endian> |
| class Output_data_plt_aarch64 : public Output_section_data |
| { |
| public: |
| typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| Reloc_section; |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| |
| Output_data_plt_aarch64(Layout* layout, |
| uint64_t addralign, |
| Output_data_got_aarch64<size, big_endian>* got, |
| Output_data_space* got_plt, |
| Output_data_space* got_irelative) |
| : Output_section_data(addralign), tlsdesc_rel_(NULL), |
| got_(got), got_plt_(got_plt), got_irelative_(got_irelative), |
| count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U) |
| { this->init(layout); } |
| |
| // Initialize the PLT section. |
| void |
| init(Layout* layout); |
| |
| // Add an entry to the PLT. |
| void |
| add_entry(Symbol* gsym); |
| |
| // Add the reserved TLSDESC_PLT entry to the PLT. |
| void |
| reserve_tlsdesc_entry(unsigned int got_offset) |
| { this->tlsdesc_got_offset_ = got_offset; } |
| |
| // Return true if a TLSDESC_PLT entry has been reserved. |
| bool |
| has_tlsdesc_entry() const |
| { return this->tlsdesc_got_offset_ != -1U; } |
| |
| // Return the GOT offset for the reserved TLSDESC_PLT entry. |
| unsigned int |
| get_tlsdesc_got_offset() const |
| { return this->tlsdesc_got_offset_; } |
| |
| // Return the PLT offset of the reserved TLSDESC_PLT entry. |
| unsigned int |
| get_tlsdesc_plt_offset() const |
| { |
| return (this->first_plt_entry_offset() + |
| (this->count_ + this->irelative_count_) |
| * this->get_plt_entry_size()); |
| } |
| |
| // Return the .rela.plt section data. |
| Reloc_section* |
| rela_plt() |
| { return this->rel_; } |
| |
| // Return where the TLSDESC relocations should go. |
| Reloc_section* |
| rela_tlsdesc(Layout*); |
| |
| // Return where the IRELATIVE relocations should go in the PLT |
| // relocations. |
| Reloc_section* |
| rela_irelative(Symbol_table*, Layout*); |
| |
| // Return whether we created a section for IRELATIVE relocations. |
| bool |
| has_irelative_section() const |
| { return this->irelative_rel_ != NULL; } |
| |
| // Return the number of PLT entries. |
| unsigned int |
| entry_count() const |
| { return this->count_ + this->irelative_count_; } |
| |
| // Return the offset of the first non-reserved PLT entry. |
| unsigned int |
| first_plt_entry_offset() const |
| { return this->do_first_plt_entry_offset(); } |
| |
| // Return the size of a PLT entry. |
| unsigned int |
| get_plt_entry_size() const |
| { return this->do_get_plt_entry_size(); } |
| |
| // Return the reserved tlsdesc entry size. |
| unsigned int |
| get_plt_tlsdesc_entry_size() const |
| { return this->do_get_plt_tlsdesc_entry_size(); } |
| |
| // Return the PLT address to use for a global symbol. |
| uint64_t |
| address_for_global(const Symbol*); |
| |
| // Return the PLT address to use for a local symbol. |
| uint64_t |
| address_for_local(const Relobj*, unsigned int symndx); |
| |
| protected: |
| // Fill in the first PLT entry. |
| void |
| fill_first_plt_entry(unsigned char* pov, |
| Address got_address, |
| Address plt_address) |
| { this->do_fill_first_plt_entry(pov, got_address, plt_address); } |
| |
| // Fill in a normal PLT entry. |
| void |
| fill_plt_entry(unsigned char* pov, |
| Address got_address, |
| Address plt_address, |
| unsigned int got_offset, |
| unsigned int plt_offset) |
| { |
| this->do_fill_plt_entry(pov, got_address, plt_address, |
| got_offset, plt_offset); |
| } |
| |
| // Fill in the reserved TLSDESC PLT entry. |
| void |
| fill_tlsdesc_entry(unsigned char* pov, |
| Address gotplt_address, |
| Address plt_address, |
| Address got_base, |
| unsigned int tlsdesc_got_offset, |
| unsigned int plt_offset) |
| { |
| this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, |
| tlsdesc_got_offset, plt_offset); |
| } |
| |
| virtual unsigned int |
| do_first_plt_entry_offset() const = 0; |
| |
| virtual unsigned int |
| do_get_plt_entry_size() const = 0; |
| |
| virtual unsigned int |
| do_get_plt_tlsdesc_entry_size() const = 0; |
| |
| virtual void |
| do_fill_first_plt_entry(unsigned char* pov, |
| Address got_addr, |
| Address plt_addr) = 0; |
| |
| virtual void |
| do_fill_plt_entry(unsigned char* pov, |
| Address got_address, |
| Address plt_address, |
| unsigned int got_offset, |
| unsigned int plt_offset) = 0; |
| |
| virtual void |
| do_fill_tlsdesc_entry(unsigned char* pov, |
| Address gotplt_address, |
| Address plt_address, |
| Address got_base, |
| unsigned int tlsdesc_got_offset, |
| unsigned int plt_offset) = 0; |
| |
| void |
| do_adjust_output_section(Output_section* os); |
| |
| // Write to a map file. |
| void |
| do_print_to_mapfile(Mapfile* mapfile) const |
| { mapfile->print_output_data(this, _("** PLT")); } |
| |
| private: |
| // Set the final size. |
| void |
| set_final_data_size(); |
| |
| // Write out the PLT data. |
| void |
| do_write(Output_file*); |
| |
| // The reloc section. |
| Reloc_section* rel_; |
| |
| // The TLSDESC relocs, if necessary. These must follow the regular |
| // PLT relocs. |
| Reloc_section* tlsdesc_rel_; |
| |
| // The IRELATIVE relocs, if necessary. These must follow the |
| // regular PLT relocations. |
| Reloc_section* irelative_rel_; |
| |
| // The .got section. |
| Output_data_got_aarch64<size, big_endian>* got_; |
| |
| // The .got.plt section. |
| Output_data_space* got_plt_; |
| |
| // The part of the .got.plt section used for IRELATIVE relocs. |
| Output_data_space* got_irelative_; |
| |
| // The number of PLT entries. |
| unsigned int count_; |
| |
| // Number of PLT entries with R_X86_64_IRELATIVE relocs. These |
| // follow the regular PLT entries. |
| unsigned int irelative_count_; |
| |
| // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline. |
| // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1 |
| // indicates an offset is not allocated. |
| unsigned int tlsdesc_got_offset_; |
| }; |
| |
| // Initialize the PLT section. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_aarch64<size, big_endian>::init(Layout* layout) |
| { |
| this->rel_ = new Reloc_section(false); |
| layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| elfcpp::SHF_ALLOC, this->rel_, |
| ORDER_DYNAMIC_PLT_RELOCS, false); |
| } |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section( |
| Output_section* os) |
| { |
| os->set_entsize(this->get_plt_entry_size()); |
| } |
| |
| // Add an entry to the PLT. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol* gsym) |
| { |
| gold_assert(!gsym->has_plt_offset()); |
| |
| gsym->set_plt_offset((this->count_) * this->get_plt_entry_size() |
| + this->first_plt_entry_offset()); |
| |
| ++this->count_; |
| |
| section_offset_type got_offset = this->got_plt_->current_data_size(); |
| |
| // Every PLT entry needs a GOT entry which points back to the PLT |
| // entry (this will be changed by the dynamic linker, normally |
| // lazily when the function is called). |
| this->got_plt_->set_current_data_size(got_offset + size / 8); |
| |
| // Every PLT entry needs a reloc. |
| gsym->set_needs_dynsym_entry(); |
| this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, |
| this->got_plt_, got_offset, 0); |
| |
| // Note that we don't need to save the symbol. The contents of the |
| // PLT are independent of which symbols are used. The symbols only |
| // appear in the relocations. |
| } |
| |
| // Return where the TLSDESC relocations should go, creating it if |
| // necessary. These follow the JUMP_SLOT relocations. |
| |
| template<int size, bool big_endian> |
| typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* |
| Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout) |
| { |
| if (this->tlsdesc_rel_ == NULL) |
| { |
| this->tlsdesc_rel_ = new Reloc_section(false); |
| layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| elfcpp::SHF_ALLOC, this->tlsdesc_rel_, |
| ORDER_DYNAMIC_PLT_RELOCS, false); |
| gold_assert(this->tlsdesc_rel_->output_section() |
| == this->rel_->output_section()); |
| } |
| return this->tlsdesc_rel_; |
| } |
| |
| // Return where the IRELATIVE relocations should go in the PLT. These |
| // follow the JUMP_SLOT and the TLSDESC relocations. |
| |
| template<int size, bool big_endian> |
| typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* |
| Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab, |
| Layout* layout) |
| { |
| if (this->irelative_rel_ == NULL) |
| { |
| // Make sure we have a place for the TLSDESC relocations, in |
| // case we see any later on. |
| this->rela_tlsdesc(layout); |
| this->irelative_rel_ = new Reloc_section(false); |
| layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| elfcpp::SHF_ALLOC, this->irelative_rel_, |
| ORDER_DYNAMIC_PLT_RELOCS, false); |
| gold_assert(this->irelative_rel_->output_section() |
| == this->rel_->output_section()); |
| |
| if (parameters->doing_static_link()) |
| { |
| // A statically linked executable will only have a .rela.plt |
| // section to hold R_AARCH64_IRELATIVE relocs for |
| // STT_GNU_IFUNC symbols. The library will use these |
| // symbols to locate the IRELATIVE relocs at program startup |
| // time. |
| symtab->define_in_output_data("__rela_iplt_start", NULL, |
| Symbol_table::PREDEFINED, |
| this->irelative_rel_, 0, 0, |
| elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| elfcpp::STV_HIDDEN, 0, false, true); |
| symtab->define_in_output_data("__rela_iplt_end", NULL, |
| Symbol_table::PREDEFINED, |
| this->irelative_rel_, 0, 0, |
| elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| elfcpp::STV_HIDDEN, 0, true, true); |
| } |
| } |
| return this->irelative_rel_; |
| } |
| |
| // Return the PLT address to use for a global symbol. |
| |
| template<int size, bool big_endian> |
| uint64_t |
| Output_data_plt_aarch64<size, big_endian>::address_for_global( |
| const Symbol* gsym) |
| { |
| uint64_t offset = 0; |
| if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| && gsym->can_use_relative_reloc(false)) |
| offset = (this->first_plt_entry_offset() + |
| this->count_ * this->get_plt_entry_size()); |
| return this->address() + offset + gsym->plt_offset(); |
| } |
| |
| // Return the PLT address to use for a local symbol. These are always |
| // IRELATIVE relocs. |
| |
| template<int size, bool big_endian> |
| uint64_t |
| Output_data_plt_aarch64<size, big_endian>::address_for_local( |
| const Relobj* object, |
| unsigned int r_sym) |
| { |
| return (this->address() |
| + this->first_plt_entry_offset() |
| + this->count_ * this->get_plt_entry_size() |
| + object->local_plt_offset(r_sym)); |
| } |
| |
| // Set the final size. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_aarch64<size, big_endian>::set_final_data_size() |
| { |
| unsigned int count = this->count_ + this->irelative_count_; |
| unsigned int extra_size = 0; |
| if (this->has_tlsdesc_entry()) |
| extra_size += this->get_plt_tlsdesc_entry_size(); |
| this->set_data_size(this->first_plt_entry_offset() |
| + count * this->get_plt_entry_size() |
| + extra_size); |
| } |
| |
| template<int size, bool big_endian> |
| class Output_data_plt_aarch64_standard : |
| public Output_data_plt_aarch64<size, big_endian> |
| { |
| public: |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| Output_data_plt_aarch64_standard( |
| Layout* layout, |
| Output_data_got_aarch64<size, big_endian>* got, |
| Output_data_space* got_plt, |
| Output_data_space* got_irelative) |
| : Output_data_plt_aarch64<size, big_endian>(layout, |
| size == 32 ? 4 : 8, |
| got, got_plt, |
| got_irelative) |
| { } |
| |
| protected: |
| // Return the offset of the first non-reserved PLT entry. |
| virtual unsigned int |
| do_first_plt_entry_offset() const |
| { return this->first_plt_entry_size; } |
| |
| // Return the size of a PLT entry |
| virtual unsigned int |
| do_get_plt_entry_size() const |
| { return this->plt_entry_size; } |
| |
| // Return the size of a tlsdesc entry |
| virtual unsigned int |
| do_get_plt_tlsdesc_entry_size() const |
| { return this->plt_tlsdesc_entry_size; } |
| |
| virtual void |
| do_fill_first_plt_entry(unsigned char* pov, |
| Address got_address, |
| Address plt_address); |
| |
| virtual void |
| do_fill_plt_entry(unsigned char* pov, |
| Address got_address, |
| Address plt_address, |
| unsigned int got_offset, |
| unsigned int plt_offset); |
| |
| virtual void |
| do_fill_tlsdesc_entry(unsigned char* pov, |
| Address gotplt_address, |
| Address plt_address, |
| Address got_base, |
| unsigned int tlsdesc_got_offset, |
| unsigned int plt_offset); |
| |
| private: |
| // The size of the first plt entry size. |
| static const int first_plt_entry_size = 32; |
| // The size of the plt entry size. |
| static const int plt_entry_size = 16; |
| // The size of the plt tlsdesc entry size. |
| static const int plt_tlsdesc_entry_size = 32; |
| // Template for the first PLT entry. |
| static const uint32_t first_plt_entry[first_plt_entry_size / 4]; |
| // Template for subsequent PLT entries. |
| static const uint32_t plt_entry[plt_entry_size / 4]; |
| // The reserved TLSDESC entry in the PLT for an executable. |
| static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4]; |
| }; |
| |
| // The first entry in the PLT for an executable. |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<32, false>:: |
| first_plt_entry[first_plt_entry_size / 4] = |
| { |
| 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 0x90000010, /* adrp x16, PLT_GOT+0x8 */ |
| 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ |
| 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ |
| 0xd61f0220, /* br x17 */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<32, true>:: |
| first_plt_entry[first_plt_entry_size / 4] = |
| { |
| 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 0x90000010, /* adrp x16, PLT_GOT+0x8 */ |
| 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ |
| 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ |
| 0xd61f0220, /* br x17 */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<64, false>:: |
| first_plt_entry[first_plt_entry_size / 4] = |
| { |
| 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 0x90000010, /* adrp x16, PLT_GOT+16 */ |
| 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ |
| 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ |
| 0xd61f0220, /* br x17 */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<64, true>:: |
| first_plt_entry[first_plt_entry_size / 4] = |
| { |
| 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 0x90000010, /* adrp x16, PLT_GOT+16 */ |
| 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ |
| 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ |
| 0xd61f0220, /* br x17 */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<32, false>:: |
| plt_entry[plt_entry_size / 4] = |
| { |
| 0x90000010, /* adrp x16, PLTGOT + n * 4 */ |
| 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ |
| 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ |
| 0xd61f0220, /* br x17. */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<32, true>:: |
| plt_entry[plt_entry_size / 4] = |
| { |
| 0x90000010, /* adrp x16, PLTGOT + n * 4 */ |
| 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ |
| 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ |
| 0xd61f0220, /* br x17. */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<64, false>:: |
| plt_entry[plt_entry_size / 4] = |
| { |
| 0x90000010, /* adrp x16, PLTGOT + n * 8 */ |
| 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ |
| 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ |
| 0xd61f0220, /* br x17. */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<64, true>:: |
| plt_entry[plt_entry_size / 4] = |
| { |
| 0x90000010, /* adrp x16, PLTGOT + n * 8 */ |
| 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ |
| 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ |
| 0xd61f0220, /* br x17. */ |
| }; |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry( |
| unsigned char* pov, |
| Address got_address, |
| Address plt_address) |
| { |
| // PLT0 of the small PLT looks like this in ELF64 - |
| // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack. |
| // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT |
| // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the |
| // symbol resolver |
| // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the |
| // GOTPLT entry for this. |
| // br x17 |
| // PLT0 will be slightly different in ELF32 due to different got entry |
| // size. |
| memcpy(pov, this->first_plt_entry, this->first_plt_entry_size); |
| Address gotplt_2nd_ent = got_address + (size / 8) * 2; |
| |
| // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2. |
| // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff. |
| // FIXME: This only works for 64bit |
| AArch64_relocate_functions<size, big_endian>::adrp(pov + 4, |
| gotplt_2nd_ent, plt_address + 4); |
| |
| // Fill in R_AARCH64_LDST8_LO12 |
| elfcpp::Swap<32, big_endian>::writeval( |
| pov + 8, |
| ((this->first_plt_entry[2] & 0xffc003ff) |
| | ((gotplt_2nd_ent & 0xff8) << 7))); |
| |
| // Fill in R_AARCH64_ADD_ABS_LO12 |
| elfcpp::Swap<32, big_endian>::writeval( |
| pov + 12, |
| ((this->first_plt_entry[3] & 0xffc003ff) |
| | ((gotplt_2nd_ent & 0xfff) << 10))); |
| } |
| |
| // Subsequent entries in the PLT for an executable. |
| // FIXME: This only works for 64bit |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry( |
| unsigned char* pov, |
| Address got_address, |
| Address plt_address, |
| unsigned int got_offset, |
| unsigned int plt_offset) |
| { |
| memcpy(pov, this->plt_entry, this->plt_entry_size); |
| |
| Address gotplt_entry_address = got_address + got_offset; |
| Address plt_entry_address = plt_address + plt_offset; |
| |
| // Fill in R_AARCH64_PCREL_ADR_HI21 |
| AArch64_relocate_functions<size, big_endian>::adrp( |
| pov, |
| gotplt_entry_address, |
| plt_entry_address); |
| |
| // Fill in R_AARCH64_LDST64_ABS_LO12 |
| elfcpp::Swap<32, big_endian>::writeval( |
| pov + 4, |
| ((this->plt_entry[1] & 0xffc003ff) |
| | ((gotplt_entry_address & 0xff8) << 7))); |
| |
| // Fill in R_AARCH64_ADD_ABS_LO12 |
| elfcpp::Swap<32, big_endian>::writeval( |
| pov + 8, |
| ((this->plt_entry[2] & 0xffc003ff) |
| | ((gotplt_entry_address & 0xfff) <<10))); |
| |
| } |
| |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<32, false>:: |
| tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| { |
| 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 0x90000002, /* adrp x2, 0 */ |
| 0x90000003, /* adrp x3, 0 */ |
| 0xb9400042, /* ldr w2, [w2, #0] */ |
| 0x11000063, /* add w3, w3, 0 */ |
| 0xd61f0040, /* br x2 */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<32, true>:: |
| tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| { |
| 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 0x90000002, /* adrp x2, 0 */ |
| 0x90000003, /* adrp x3, 0 */ |
| 0xb9400042, /* ldr w2, [w2, #0] */ |
| 0x11000063, /* add w3, w3, 0 */ |
| 0xd61f0040, /* br x2 */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<64, false>:: |
| tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| { |
| 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 0x90000002, /* adrp x2, 0 */ |
| 0x90000003, /* adrp x3, 0 */ |
| 0xf9400042, /* ldr x2, [x2, #0] */ |
| 0x91000063, /* add x3, x3, 0 */ |
| 0xd61f0040, /* br x2 */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| }; |
| |
| template<> |
| const uint32_t |
| Output_data_plt_aarch64_standard<64, true>:: |
| tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| { |
| 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 0x90000002, /* adrp x2, 0 */ |
| 0x90000003, /* adrp x3, 0 */ |
| 0xf9400042, /* ldr x2, [x2, #0] */ |
| 0x91000063, /* add x3, x3, 0 */ |
| 0xd61f0040, /* br x2 */ |
| 0xd503201f, /* nop */ |
| 0xd503201f, /* nop */ |
| }; |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry( |
| unsigned char* pov, |
| Address gotplt_address, |
| Address plt_address, |
| Address got_base, |
| unsigned int tlsdesc_got_offset, |
| unsigned int plt_offset) |
| { |
| memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size); |
| |
| // move DT_TLSDESC_GOT address into x2 |
| // move .got.plt address into x3 |
| Address tlsdesc_got_entry = got_base + tlsdesc_got_offset; |
| Address plt_entry_address = plt_address + plt_offset; |
| |
| // R_AARCH64_ADR_PREL_PG_HI21 |
| AArch64_relocate_functions<size, big_endian>::adrp( |
| pov + 4, |
| tlsdesc_got_entry, |
| plt_entry_address + 4); |
| |
| // R_AARCH64_ADR_PREL_PG_HI21 |
| AArch64_relocate_functions<size, big_endian>::adrp( |
| pov + 8, |
| gotplt_address, |
| plt_entry_address + 8); |
| |
| // R_AARCH64_LDST64_ABS_LO12 |
| elfcpp::Swap<32, big_endian>::writeval( |
| pov + 12, |
| ((this->tlsdesc_plt_entry[3] & 0xffc003ff) |
| | ((tlsdesc_got_entry & 0xff8) << 7))); |
| |
| // R_AARCH64_ADD_ABS_LO12 |
| elfcpp::Swap<32, big_endian>::writeval( |
| pov + 16, |
| ((this->tlsdesc_plt_entry[4] & 0xffc003ff) |
| | ((gotplt_address & 0xfff) << 10))); |
| } |
| |
| // Write out the PLT. This uses the hand-coded instructions above, |
| // and adjusts them as needed. This is specified by the AMD64 ABI. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of) |
| { |
| const off_t offset = this->offset(); |
| const section_size_type oview_size = |
| convert_to_section_size_type(this->data_size()); |
| unsigned char* const oview = of->get_output_view(offset, oview_size); |
| |
| const off_t got_file_offset = this->got_plt_->offset(); |
| const section_size_type got_size = |
| convert_to_section_size_type(this->got_plt_->data_size()); |
| unsigned char* const got_view = of->get_output_view(got_file_offset, |
| got_size); |
| |
| unsigned char* pov = oview; |
| |
| // The base address of the .plt section. |
| typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
| // The base address of the PLT portion of the .got section. |
| typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address |
| = this->got_plt_->address(); |
| |
| this->fill_first_plt_entry(pov, gotplt_address, plt_address); |
| pov += this->first_plt_entry_offset(); |
| |
| // The first three entries in .got.plt are reserved. |
| unsigned char* got_pov = got_view; |
| memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT); |
| got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; |
| |
| unsigned int plt_offset = this->first_plt_entry_offset(); |
| unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; |
| const unsigned int count = this->count_ + this->irelative_count_; |
| for (unsigned int plt_index = 0; |
| plt_index < count; |
| ++plt_index, |
| pov += this->get_plt_entry_size(), |
| got_pov += size / 8, |
| plt_offset += this->get_plt_entry_size(), |
| got_offset += size / 8) |
| { |
| // Set and adjust the PLT entry itself. |
| this->fill_plt_entry(pov, gotplt_address, plt_address, |
| got_offset, plt_offset); |
| |
| // Set the entry in the GOT, which points to plt0. |
| elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address); |
| } |
| |
| if (this->has_tlsdesc_entry()) |
| { |
| // Set and adjust the reserved TLSDESC PLT entry. |
| unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); |
| // The base address of the .base section. |
| typename elfcpp::Elf_types<size>::Elf_Addr got_base = |
| this->got_->address(); |
| this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, |
| tlsdesc_got_offset, plt_offset); |
| pov += this->get_plt_tlsdesc_entry_size(); |
| } |
| |
| 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); |
| } |
| |
| // Telling how to update the immediate field of an instruction. |
| struct AArch64_howto |
| { |
| // The immediate field mask. |
| elfcpp::Elf_Xword dst_mask; |
| |
| // The offset to apply relocation immediate |
| int doffset; |
| |
| // The second part offset, if the immediate field has two parts. |
| // -1 if the immediate field has only one part. |
| int doffset2; |
| }; |
| |
| static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] = |
| { |
| {0, -1, -1}, // DATA |
| {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16 |
| {0xffffe0, 5, -1}, // LD [23:5]-imm19 |
| {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi |
| {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi |
| {0x3ffc00, 10, -1}, // ADD [21:10]-imm12 |
| {0x3ffc00, 10, -1}, // LDST [21:10]-imm12 |
| {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14 |
| {0xffffe0, 5, -1}, // CONDB [23:5]-imm19 |
| {0x3ffffff, 0, -1}, // B [25:0]-imm26 |
| {0x3ffffff, 0, -1}, // CALL [25:0]-imm26 |
| }; |
| |
| // AArch64 relocate function class |
| |
| template<int size, bool big_endian> |
| class AArch64_relocate_functions |
| { |
| public: |
| typedef enum |
| { |
| STATUS_OKAY, // No error during relocation. |
| STATUS_OVERFLOW, // Relocation overflow. |
| STATUS_BAD_RELOC, // Relocation cannot be applied. |
| } Status; |
| |
| private: |
| typedef AArch64_relocate_functions<size, big_endian> This; |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| |
| // Return the page address of the address. |
| // Page(address) = address & ~0xFFF |
| |
| static inline typename elfcpp::Swap<size, big_endian>::Valtype |
| Page(Address address) |
| { |
| return (address & (~static_cast<Address>(0xFFF))); |
| } |
| |
| // Update instruction (pointed by view) with selected bits (immed). |
| // val = (val & ~dst_mask) | (immed << doffset) |
| |
| template<int valsize> |
| static inline void |
| update_view(unsigned char* view, |
| typename elfcpp::Swap<size, big_endian>::Valtype immed, |
| elfcpp::Elf_Xword doffset, |
| elfcpp::Elf_Xword dst_mask) |
| { |
| typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| Valtype* wv = reinterpret_cast<Valtype*>(view); |
| Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| |
| // Clear immediate fields. |
| val &= ~dst_mask; |
| elfcpp::Swap<valsize, big_endian>::writeval(wv, |
| static_cast<Valtype>(val | (immed << doffset))); |
| } |
| |
| // Update two parts of an instruction (pointed by view) with selected |
| // bits (immed1 and immed2). |
| // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2) |
| |
| template<int valsize> |
| static inline void |
| update_view_two_parts( |
| unsigned char* view, |
| typename elfcpp::Swap<size, big_endian>::Valtype immed1, |
| typename elfcpp::Swap<size, big_endian>::Valtype immed2, |
| elfcpp::Elf_Xword doffset1, |
| elfcpp::Elf_Xword doffset2, |
| elfcpp::Elf_Xword dst_mask) |
| { |
| typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| Valtype* wv = reinterpret_cast<Valtype*>(view); |
| Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| val &= ~dst_mask; |
| elfcpp::Swap<valsize, big_endian>::writeval(wv, |
| static_cast<Valtype>(val | (immed1 << doffset1) | |
| (immed2 << doffset2))); |
| } |
| |
| // Update adr or adrp instruction with [32:12] of X. |
| // In adr and adrp: [30:29] immlo [23:5] immhi |
| |
| static inline void |
| update_adr(unsigned char* view, |
| typename elfcpp::Swap<size, big_endian>::Valtype x, |
| const AArch64_reloc_property* /* reloc_property */) |
| { |
| elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5); |
| typename elfcpp::Swap<32, big_endian>::Valtype immed = |
| (x >> 12) & 0x1fffff; |
| This::template update_view_two_parts<32>( |
| view, |
| immed & 0x3, |
| (immed & 0x1ffffc) >> 2, |
| 29, |
| 5, |
| dst_mask); |
| } |
| |
| // Update movz/movn instruction with bits immed. |
| // Set instruction to movz if is_movz is true, otherwise set instruction |
| // to movn. |
| static inline void |
| update_movnz(unsigned char* view, |
| typename elfcpp::Swap<size, big_endian>::Valtype immed, |
| bool is_movz) |
| { |
| typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; |
| Valtype* wv = reinterpret_cast<Valtype*>(view); |
| Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); |
| |
| const elfcpp::Elf_Xword doffset = |
| aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset; |
| const elfcpp::Elf_Xword dst_mask = |
| aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask; |
| |
| // Clear immediate fields and opc code. |
| val &= ~(dst_mask | (0x11 << 29)); |
| |
| // Set instruction to movz or movn. |
| // movz: [30:29] is 10 movn: [30:29] is 00 |
| if (is_movz) |
| val |= (0x10 << 29); |
| |
| elfcpp::Swap<32, big_endian>::writeval(wv, |
| static_cast<Valtype>(val | (immed << doffset))); |
| } |
| |
| public: |
| |
| // Do a simple rela relocation at unaligned addresses. |
| |
| template<int valsize> |
| static inline typename This::Status |
| rela_ua(unsigned char* view, |
| const Sized_relobj_file<size, big_endian>* object, |
| const Symbol_value<size>* psymval, |
| typename elfcpp::Swap<size, big_endian>::Valtype addend, |
| const AArch64_reloc_property* reloc_property) |
| { |
| typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| Valtype; |
| typename elfcpp::Elf_types<size>::Elf_Addr x = |
| psymval->value(object, addend); |
| elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, |
| static_cast<Valtype>(x)); |
| return (reloc_property->checkup_x_value(x) |
| ? This::STATUS_OKAY |
| : This::STATUS_OVERFLOW); |
| } |
| |
| // Do a simple pc-relative relocation at unaligned addresses. |
| |
| template<int valsize> |
| static inline typename This::Status |
| pcrela_ua(unsigned char* view, |
| const Sized_relobj_file<size, big_endian>* object, |
| const Symbol_value<size>* psymval, |
| typename elfcpp::Swap<size, big_endian>::Valtype addend, |
| Address address, |
| const AArch64_reloc_property* reloc_property) |
| { |
| typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| Valtype; |
| Address x = psymval->value(object, addend) - address; |
| elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, |
| static_cast<Valtype>(x)); |
| return (reloc_property->checkup_x_value(x) |
| ? This::STATUS_OKAY |
| : This::STATUS_OVERFLOW); |
| } |
| |
| // Do a simple rela relocation at aligned addresses. |
| |
| template<int valsize> |
| static inline typename This::Status |
| rela( |
| unsigned char* view, |
| const Sized_relobj_file<size, big_endian>* object, |
| const Symbol_value<size>* psymval, |
| typename elfcpp::Swap<size, big_endian>::Valtype addend, |
| const AArch64_reloc_property* reloc_property) |
| { |
| typedef typename elfcpp::Swap<valsize, big_endian>::Valtype |
| Valtype; |
| Valtype* wv = reinterpret_cast<Valtype*>(view); |
| Address x = psymval->value(object, addend); |
| elfcpp::Swap<valsize, big_endian>::writeval(wv, |
| static_cast<Valtype>(x)); |
| return (reloc_property->checkup_x_value(x) |
| ? This::STATUS_OKAY |
| : This::STATUS_OVERFLOW); |
| } |
| |
| // Do relocate. Update selected bits in text. |
| // new_val = (val & ~dst_mask) | (immed << doffset) |
| |
| template<int valsize> |
| static inline typename This::Status |
| rela_general(unsigned char* view, |
| const Sized_relobj_file<size, big_endian>* object, |
| const Symbol_value<size>* psymval, |
| typename elfcpp::Swap<size, big_endian>::Valtype addend, |
| const AArch64_reloc_property* reloc_property) |
| { |
| // Calculate relocation. |
| Address x = psymval->value(object, addend); |
| |
| // Select bits from X. |
| Address immed = reloc_property->select_x_value(x); |
| |
| // Update view. |
| const AArch64_reloc_property::Reloc_inst inst = |
| reloc_property->reloc_inst(); |
| // If it is a data relocation or instruction has 2 parts of immediate |
| // fields, you should not call rela_general. |
| gold_assert(aarch64_howto[inst].doffset2 == -1 && |
| aarch64_howto[inst].doffset != -1); |
| This::template update_view<valsize>(view, immed, |
| aarch64_howto[inst].doffset, |
| aarch64_howto[inst].dst_mask); |
| |
| // Do check overflow or alignment if needed. |
| return (reloc_property->checkup_x_value(x) |
| ? This::STATUS_OKAY |
| : This::STATUS_OVERFLOW); |
| } |
| |
| // Do relocate. Update selected bits in text. |
| // new val = (val & ~dst_mask) | (immed << doffset) |
| |
| template<int valsize> |
| static inline typename This::Status |
| rela_general( |
| unsigned char* view, |
| typename elfcpp::Swap<size, big_endian>::Valtype s, |
| typename elfcpp::Swap<size, big_endian>::Valtype addend, |
| const AArch64_reloc_property* reloc_property) |
| { |
| // Calculate relocation. |
| Address x = s + addend; |
| |
| // Select bits from X. |
| Address immed = reloc_property->select_x_value(x); |
| |
| // Update view. |
| const AArch64_reloc_property::Reloc_inst inst = |
| reloc_property->reloc_inst(); |
| // If it is a data relocation or instruction has 2 parts of immediate |
| // fields, you should not call rela_general. |
| gold_assert(aarch64_howto[inst].doffset2 == -1 && |
| aarch64_howto[inst].doffset != -1); |
| This::template update_view<valsize>(view, immed, |
| aarch64_howto[inst].doffset, |
| aarch64_howto[inst].dst_mask); |
| |
| // Do check overflow or alignment if needed. |
| return (reloc_property->checkup_x_value(x) |
| ? This::STATUS_OKAY |
| : This::STATUS_OVERFLOW); |
| } |
| |
| // Do address relative relocate. Update selected bits in text. |
| // new val = (val & ~dst_mask) | (immed << doffset) |
| |
| template<int valsize> |
| static inline typename This::Status |
| pcrela_general( |
| unsigned char* view, |
| const Sized_relobj_file<size, big_endian>* object, |
| const Symbol_value<size>* psymval, |
| typename elfcpp::Swap<size, big_endian>::Valtype addend, |
| Address address, |
| const AArch64_reloc_property* reloc_property) |
| { |
| // Calculate relocation. |
| Address x = psymval->value(object, addend) - address; |
| |
| // Select bits from X. |
| Address immed = reloc_property->select_x_value(x); |
| |
| // Update view. |
| const AArch64_reloc_property::Reloc_inst inst = |
| reloc_property->reloc_inst(); |
| // If it is a data relocation or instruction has 2 parts of immediate |
| // fields, you should not call pcrela_general. |
| gold_assert(aarch64_howto[inst].doffset2 == -1 && |
| aarch64_howto[inst].doffset != -1); |
| This::template update_view<valsize>(view, immed, |
| aarch64_howto[inst].doffset, |
| aarch64_howto[inst].dst_mask); |
| |
| // Do check overflow or alignment if needed. |
| return (reloc_property->checkup_x_value(x) |
| ? This::STATUS_OKAY |
| : This::STATUS_OVERFLOW); |
| } |
| |
| // Calculate PG(S+A) - PG(address), update adrp instruction. |
| // R_AARCH64_ADR_PREL_PG_HI21 |
| |
| static inline typename This::Status |
| adrp( |
| unsigned char* view, |
| Address sa, |
| Address address) |
| { |
| typename elfcpp::Swap<size, big_endian>::Valtype x = |
| This::Page(sa) - This::Page(address); |
| update_adr(view, x, NULL); |
| return (size == 64 && Bits<32>::has_overflow(x) |
| ? This::STATUS_OVERFLOW |
| : This::STATUS_OKAY); |
| } |
| |
| // Calculate PG(S+A) - PG(address), update adrp instruction. |
| // R_AARCH64_ADR_PREL_PG_HI21 |
| |
| static inline typename This::Status |
| adrp(unsigned char* view, |
| const Sized_relobj_file<size, big_endian>* object, |
| const Symbol_value<size>* psymval, |
| Address addend, |
| Address address, |
| const AArch64_reloc_property* reloc_property) |
| { |
| Address sa = psymval->value(object, addend); |
| typename elfcpp::Swap<size, big_endian>::Valtype x = |
| This::Page(sa) - This::Page(address); |
| update_adr(view, x, reloc_property); |
| return (reloc_property->checkup_x_value(x) |
| ? This::STATUS_OKAY |
| : This::STATUS_OVERFLOW); |
| } |
| |
| // Update mov[n/z] instruction. Check overflow if needed. |
| // If X >=0, set the instruction to movz and its immediate value to the |
| // selected bits S. |
| // If X < 0, set the instruction to movn and its immediate value to |
| // NOT (selected bits of). |
| |
| static inline typename This::Status |
| movnz(unsigned char* view, |
| typename elfcpp::Swap<size, big_endian>::Valtype x, |
| const AArch64_reloc_property* reloc_property) |
| { |
| // Select bits from X. |
| Address immed = reloc_property->select_x_value(x); |
| bool is_movz = true; |
| if (static_cast<int64_t>(x) < 0) |
| { |
| immed = ~immed; |
| is_movz = false; |
| } |
| |
| // Update movnz instruction. |
| update_movnz(view, immed, is_movz); |
| |
| // Do check overflow or alignment if needed. |
| return (reloc_property->checkup_x_value(x) |
| ? This::STATUS_OKAY |
| : This::STATUS_OVERFLOW); |
| } |
| |
| }; // End of AArch64_relocate_functions |
| |
| |
| template<int size, bool big_endian> |
| typename elfcpp::Elf_types<size>::Elf_Addr |
| Target_aarch64<size, big_endian>::do_reloc_addend( |
| void* arg, unsigned int r_type, |
| typename elfcpp::Elf_types<size>::Elf_Addr) const |
| { |
| gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); |
| uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); |
| gold_assert(intarg < this->tlsdesc_reloc_info_.size()); |
| const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); |
| const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
| gold_assert(psymval->is_tls_symbol()); |
| // The value of a TLS symbol is the offset in the TLS segment. |
| return psymval->value(ti.object, 0); |
| } |
| |
| // Return the number of entries in the PLT. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Target_aarch64<size, big_endian>::plt_entry_count() const |
| { |
| if (this->plt_ == NULL) |
| return 0; |
| return this->plt_->entry_count(); |
| } |
| |
| // Return the offset of the first non-reserved PLT entry. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Target_aarch64<size, big_endian>::first_plt_entry_offset() const |
| { |
| return this->plt_->first_plt_entry_offset(); |
| } |
| |
| // Return the size of each PLT entry. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Target_aarch64<size, big_endian>::plt_entry_size() const |
| { |
| return this->plt_->get_plt_entry_size(); |
| } |
| |
| // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::define_tls_base_symbol( |
| Symbol_table* symtab, Layout* layout) |
| { |
| if (this->tls_base_symbol_defined_) |
| return; |
| |
| Output_segment* tls_segment = layout->tls_segment(); |
| if (tls_segment != NULL) |
| { |
| bool is_exec = parameters->options().output_is_executable(); |
| symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
| Symbol_table::PREDEFINED, |
| tls_segment, 0, 0, |
| elfcpp::STT_TLS, |
| elfcpp::STB_LOCAL, |
| elfcpp::STV_HIDDEN, 0, |
| (is_exec |
| ? Symbol::SEGMENT_END |
| : Symbol::SEGMENT_START), |
| true); |
| } |
| this->tls_base_symbol_defined_ = true; |
| } |
| |
| // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::reserve_tlsdesc_entries( |
| Symbol_table* symtab, Layout* layout) |
| { |
| if (this->plt_ == NULL) |
| this->make_plt_section(symtab, layout); |
| |
| if (!this->plt_->has_tlsdesc_entry()) |
| { |
| // Allocate the TLSDESC_GOT entry. |
| Output_data_got_aarch64<size, big_endian>* got = |
| this->got_section(symtab, layout); |
| unsigned int got_offset = got->add_constant(0); |
| |
| // Allocate the TLSDESC_PLT entry. |
| this->plt_->reserve_tlsdesc_entry(got_offset); |
| } |
| } |
| |
| // Create a GOT entry for the TLS module index. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Target_aarch64<size, big_endian>::got_mod_index_entry( |
| Symbol_table* symtab, Layout* layout, |
| Sized_relobj_file<size, big_endian>* object) |
| { |
| if (this->got_mod_index_offset_ == -1U) |
| { |
| gold_assert(symtab != NULL && layout != NULL && object != NULL); |
| Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
| Output_data_got_aarch64<size, big_endian>* got = |
| this->got_section(symtab, layout); |
| unsigned int got_offset = got->add_constant(0); |
| rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got, |
| got_offset, 0); |
| got->add_constant(0); |
| this->got_mod_index_offset_ = got_offset; |
| } |
| return this->got_mod_index_offset_; |
| } |
| |
| // Optimize the TLS relocation type based on what we know about the |
| // symbol. IS_FINAL is true if the final address of this symbol is |
| // known at link time. |
| |
| template<int size, bool big_endian> |
| tls::Tls_optimization |
| Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final, |
| int r_type) |
| { |
| // If we are generating a shared library, then we can't do anything |
| // in the linker |
| if (parameters->options().shared()) |
| return tls::TLSOPT_NONE; |
| |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| case elfcpp::R_AARCH64_TLSDESC_LD_PREL19: |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21: |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_OFF_G1: |
| case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC: |
| case elfcpp::R_AARCH64_TLSDESC_LDR: |
| case elfcpp::R_AARCH64_TLSDESC_ADD: |
| case elfcpp::R_AARCH64_TLSDESC_CALL: |
| // These are General-Dynamic which permits fully general TLS |
| // access. Since we know that we are generating an executable, |
| // we can convert this to Initial-Exec. If we also know that |
| // this is a local symbol, we can further switch to Local-Exec. |
| if (is_final) |
| return tls::TLSOPT_TO_LE; |
| return tls::TLSOPT_TO_IE; |
| |
| case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1: |
| case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC: |
| case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19: |
| // These are Initial-Exec relocs which get the thread offset |
| // from the GOT. If we know that we are linking against the |
| // local symbol, we can switch to Local-Exec, which links the |
| // thread offset into the instruction. |
| if (is_final) |
| return tls::TLSOPT_TO_LE; |
| return tls::TLSOPT_NONE; |
| |
| case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| // When we already have Local-Exec, there is nothing further we |
| // can do. |
| return tls::TLSOPT_NONE; |
| |
| default: |
| gold_unreachable(); |
| } |
| } |
| |
| // Returns true if this relocation type could be that of a function pointer. |
| |
| template<int size, bool big_endian> |
| inline bool |
| Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc( |
| unsigned int r_type) |
| { |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_ABS64: |
| //TODO |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| // For safe ICF, scan a relocation for a local symbol to check if it |
| // corresponds to a function pointer being taken. In that case mark |
| // the function whose pointer was taken as not foldable. |
| |
| template<int size, bool big_endian> |
| inline bool |
| Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer( |
| Symbol_table* , |
| Layout* , |
| Target_aarch64<size, big_endian>* , |
| Sized_relobj_file<size, big_endian>* , |
| unsigned int , |
| Output_section* , |
| const elfcpp::Rela<size, big_endian>& , |
| unsigned int r_type, |
| const elfcpp::Sym<size, big_endian>&) |
| { |
| // When building a shared library, do not fold any local symbols as it is |
| // not possible to distinguish pointer taken versus a call by looking at |
| // the relocation types. |
| return (parameters->options().shared() |
| || possible_function_pointer_reloc(r_type)); |
| } |
| |
| // For safe ICF, scan a relocation for a global symbol to check if it |
| // corresponds to a function pointer being taken. In that case mark |
| // the function whose pointer was taken as not foldable. |
| |
| template<int size, bool big_endian> |
| inline bool |
| Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer( |
| Symbol_table* , |
| Layout* , |
| Target_aarch64<size, big_endian>* , |
| Sized_relobj_file<size, big_endian>* , |
| unsigned int , |
| Output_section* , |
| const elfcpp::Rela<size, big_endian>& , |
| unsigned int r_type, |
| Symbol* gsym) |
| { |
| // When building a shared library, do not fold symbols whose visibility |
| // is hidden, internal or protected. |
| return ((parameters->options().shared() |
| && (gsym->visibility() == elfcpp::STV_INTERNAL |
| || gsym->visibility() == elfcpp::STV_PROTECTED |
| || gsym->visibility() == elfcpp::STV_HIDDEN)) |
| || possible_function_pointer_reloc(r_type)); |
| } |
| |
| // Report an unsupported relocation against a local symbol. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local( |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int r_type) |
| { |
| gold_error(_("%s: unsupported reloc %u against local symbol"), |
| object->name().c_str(), r_type); |
| } |
| |
| // We are about to emit a dynamic relocation of type R_TYPE. If the |
| // dynamic linker does not support it, issue an error. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object, |
| unsigned int r_type) |
| { |
| gold_assert(r_type != elfcpp::R_AARCH64_NONE); |
| |
| switch (r_type) |
| { |
| // These are the relocation types supported by glibc for AARCH64. |
| case elfcpp::R_AARCH64_NONE: |
| case elfcpp::R_AARCH64_COPY: |
| case elfcpp::R_AARCH64_GLOB_DAT: |
| case elfcpp::R_AARCH64_JUMP_SLOT: |
| case elfcpp::R_AARCH64_RELATIVE: |
| case elfcpp::R_AARCH64_TLS_DTPREL64: |
| case elfcpp::R_AARCH64_TLS_DTPMOD64: |
| case elfcpp::R_AARCH64_TLS_TPREL64: |
| case elfcpp::R_AARCH64_TLSDESC: |
| case elfcpp::R_AARCH64_IRELATIVE: |
| case elfcpp::R_AARCH64_ABS32: |
| case elfcpp::R_AARCH64_ABS64: |
| return; |
| |
| default: |
| break; |
| } |
| |
| // This prevents us from issuing more than one error per reloc |
| // section. But we can still wind up issuing more than one |
| // error per object file. |
| if (this->issued_non_pic_error_) |
| return; |
| gold_assert(parameters->options().output_is_position_independent()); |
| object->error(_("requires unsupported dynamic reloc; " |
| "recompile with -fPIC")); |
| this->issued_non_pic_error_ = true; |
| return; |
| } |
| |
| // Scan a relocation for a local symbol. |
| |
| template<int size, bool big_endian> |
| inline void |
| Target_aarch64<size, big_endian>::Scan::local( |
| Symbol_table* symtab, |
| Layout* layout, |
| Target_aarch64<size, big_endian>* target, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| Output_section* output_section, |
| const elfcpp::Rela<size, big_endian>& rela, |
| unsigned int r_type, |
| const elfcpp::Sym<size, big_endian>& /* lsym */, |
| bool is_discarded) |
| { |
| if (is_discarded) |
| return; |
| |
| typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| Reloc_section; |
| Output_data_got_aarch64<size, big_endian>* got = |
| target->got_section(symtab, layout); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_ABS32: |
| case elfcpp::R_AARCH64_ABS16: |
| if (parameters->options().output_is_position_independent()) |
| { |
| gold_error(_("%s: unsupported reloc %u in pos independent link."), |
| object->name().c_str(), r_type); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_ABS64: |
| // If building a shared library or pie, we need to mark this as a dynmic |
| // reloction, so that the dynamic loader can relocate it. |
| if (parameters->options().output_is_position_independent()) |
| { |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| rela_dyn->add_local_relative(object, r_sym, |
| elfcpp::R_AARCH64_RELATIVE, |
| output_section, |
| data_shndx, |
| rela.get_r_offset(), |
| rela.get_r_addend(), |
| false /* is ifunc */); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_PREL64: |
| case elfcpp::R_AARCH64_PREL32: |
| case elfcpp::R_AARCH64_PREL16: |
| break; |
| |
| case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
| case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 |
| case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 |
| case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 |
| case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 |
| case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 |
| case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 |
| case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 |
| case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 |
| case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
| break; |
| |
| // Control flow, pc-relative. We don't need to do anything for a relative |
| // addressing relocation against a local symbol if it does not reference |
| // the GOT. |
| case elfcpp::R_AARCH64_TSTBR14: |
| case elfcpp::R_AARCH64_CONDBR19: |
| case elfcpp::R_AARCH64_JUMP26: |
| case elfcpp::R_AARCH64_CALL26: |
| break; |
| |
| case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| { |
| tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| optimize_tls_reloc(!parameters->options().shared(), r_type); |
| if (tlsopt == tls::TLSOPT_TO_LE) |
| break; |
| |
| layout->set_has_static_tls(); |
| // Create a GOT entry for the tp-relative offset. |
| if (!parameters->doing_static_link()) |
| { |
| got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, |
| target->rela_dyn_section(layout), |
| elfcpp::R_AARCH64_TLS_TPREL64); |
| } |
| else if (!object->local_has_got_offset(r_sym, |
| GOT_TYPE_TLS_OFFSET)) |
| { |
| got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET); |
| unsigned int got_offset = |
| object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET); |
| const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| gold_assert(addend == 0); |
| got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64, |
| object, r_sym); |
| } |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| { |
| tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| optimize_tls_reloc(!parameters->options().shared(), r_type); |
| if (tlsopt == tls::TLSOPT_TO_LE) |
| { |
| layout->set_has_static_tls(); |
| break; |
| } |
| gold_assert(tlsopt == tls::TLSOPT_NONE); |
| |
| got->add_local_pair_with_rel(object,r_sym, data_shndx, |
| GOT_TYPE_TLS_PAIR, |
| target->rela_dyn_section(layout), |
| elfcpp::R_AARCH64_TLS_DTPMOD64); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| { |
| layout->set_has_static_tls(); |
| bool output_is_shared = parameters->options().shared(); |
| if (output_is_shared) |
| gold_error(_("%s: unsupported TLSLE reloc %u in shared code."), |
| object->name().c_str(), r_type); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| { |
| tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| optimize_tls_reloc(!parameters->options().shared(), r_type); |
| target->define_tls_base_symbol(symtab, layout); |
| if (tlsopt == tls::TLSOPT_NONE) |
| { |
| // Create reserved PLT and GOT entries for the resolver. |
| target->reserve_tlsdesc_entries(symtab, layout); |
| |
| // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc. |
| // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT |
| // entry needs to be in an area in .got.plt, not .got. Call |
| // got_section to make sure the section has been created. |
| target->got_section(symtab, layout); |
| Output_data_got<size, big_endian>* got = |
| target->got_tlsdesc_section(); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
| { |
| unsigned int got_offset = got->add_constant(0); |
| got->add_constant(0); |
| object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, |
| got_offset); |
| Reloc_section* rt = target->rela_tlsdesc_section(layout); |
| // We store the arguments we need in a vector, and use |
| // the index into the vector as the parameter to pass |
| // to the target specific routines. |
| uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); |
| void* arg = reinterpret_cast<void*>(intarg); |
| rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg, |
| got, got_offset, 0); |
| } |
| } |
| else if (tlsopt != tls::TLSOPT_TO_LE) |
| unsupported_reloc_local(object, r_type); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_CALL: |
| break; |
| |
| default: |
| unsupported_reloc_local(object, r_type); |
| } |
| } |
| |
| |
| // Report an unsupported relocation against a global symbol. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global( |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int r_type, |
| Symbol* gsym) |
| { |
| gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
| } |
| |
| template<int size, bool big_endian> |
| inline void |
| Target_aarch64<size, big_endian>::Scan::global( |
| Symbol_table* symtab, |
| Layout* layout, |
| Target_aarch64<size, big_endian>* target, |
| Sized_relobj_file<size, big_endian> * object, |
| unsigned int data_shndx, |
| Output_section* output_section, |
| const elfcpp::Rela<size, big_endian>& rela, |
| unsigned int r_type, |
| Symbol* gsym) |
| { |
| typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| Reloc_section; |
| const AArch64_reloc_property* arp = |
| aarch64_reloc_property_table->get_reloc_property(r_type); |
| gold_assert(arp != NULL); |
| |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_ABS16: |
| case elfcpp::R_AARCH64_ABS32: |
| case elfcpp::R_AARCH64_ABS64: |
| { |
| // Make a PLT entry if necessary. |
| if (gsym->needs_plt_entry()) |
| { |
| target->make_plt_entry(symtab, layout, gsym); |
| // Since this is not a PC-relative relocation, we may be |
| // taking the address of a function. In that case we need to |
| // set the entry in the dynamic symbol table to the address of |
| // the PLT entry. |
| if (gsym->is_from_dynobj() && !parameters->options().shared()) |
| gsym->set_needs_dynsym_value(); |
| } |
| // Make a dynamic relocation if necessary. |
| if (gsym->needs_dynamic_reloc(arp->reference_flags())) |
| { |
| if (!parameters->options().output_is_position_independent() |
| && gsym->may_need_copy_reloc()) |
| { |
| target->copy_reloc(symtab, layout, object, |
| data_shndx, output_section, gsym, rela); |
| } |
| else if (r_type == elfcpp::R_AARCH64_ABS64 |
| && gsym->can_use_relative_reloc(false)) |
| { |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| rela_dyn->add_global_relative(gsym, |
| elfcpp::R_AARCH64_RELATIVE, |
| output_section, |
| object, |
| data_shndx, |
| rela.get_r_offset(), |
| rela.get_r_addend(), |
| false); |
| } |
| else |
| { |
| check_non_pic(object, r_type); |
| Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>* |
| rela_dyn = target->rela_dyn_section(layout); |
| rela_dyn->add_global( |
| gsym, r_type, output_section, object, |
| data_shndx, rela.get_r_offset(),rela.get_r_addend()); |
| } |
| } |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_PREL16: |
| case elfcpp::R_AARCH64_PREL32: |
| case elfcpp::R_AARCH64_PREL64: |
| // This is used to fill the GOT absolute address. |
| if (gsym->needs_plt_entry()) |
| { |
| target->make_plt_entry(symtab, layout, gsym); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
| case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 |
| case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 |
| case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 |
| case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 |
| case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 |
| case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 |
| case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 |
| case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 |
| case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
| { |
| if (gsym->needs_plt_entry()) |
| target->make_plt_entry(symtab, layout, gsym); |
| // Make a dynamic relocation if necessary. |
| if (gsym->needs_dynamic_reloc(arp->reference_flags())) |
| { |
| if (parameters->options().output_is_executable() |
| && gsym->may_need_copy_reloc()) |
| { |
| target->copy_reloc(symtab, layout, object, |
| data_shndx, output_section, gsym, rela); |
| } |
| } |
| break; |
| } |
| |
| case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| { |
| // This pair of relocations is used to access a specific GOT entry. |
| // Note a GOT entry is an *address* to a symbol. |
| // The symbol requires a GOT entry |
| Output_data_got_aarch64<size, big_endian>* got = |
| target->got_section(symtab, layout); |
| if (gsym->final_value_is_known()) |
| { |
| got->add_global(gsym, GOT_TYPE_STANDARD); |
| } |
| else |
| { |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| if (gsym->is_from_dynobj() |
| || gsym->is_undefined() |
| || gsym->is_preemptible() |
| || (gsym->visibility() == elfcpp::STV_PROTECTED |
| && parameters->options().shared())) |
| got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
| rela_dyn, elfcpp::R_AARCH64_GLOB_DAT); |
| else |
| { |
| if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
| { |
| rela_dyn->add_global_relative( |
| gsym, elfcpp::R_AARCH64_RELATIVE, |
| got, |
| gsym->got_offset(GOT_TYPE_STANDARD), |
| 0, |
| false); |
| } |
| } |
| } |
| break; |
| } |
| |
| case elfcpp::R_AARCH64_TSTBR14: |
| case elfcpp::R_AARCH64_CONDBR19: |
| case elfcpp::R_AARCH64_JUMP26: |
| case elfcpp::R_AARCH64_CALL26: |
| { |
| if (gsym->final_value_is_known()) |
| break; |
| |
| if (gsym->is_defined() && |
| !gsym->is_from_dynobj() && |
| !gsym->is_preemptible()) |
| break; |
| |
| // Make plt entry for function call. |
| target->make_plt_entry(symtab, layout, gsym); |
| break; |
| } |
| |
| case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // General dynamic |
| { |
| tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| if (tlsopt == tls::TLSOPT_TO_LE) |
| { |
| layout->set_has_static_tls(); |
| break; |
| } |
| gold_assert(tlsopt == tls::TLSOPT_NONE); |
| |
| // General dynamic. |
| Output_data_got_aarch64<size, big_endian>* got = |
| target->got_section(symtab, layout); |
| // Create 2 consecutive entries for module index and offset. |
| got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
| target->rela_dyn_section(layout), |
| elfcpp::R_AARCH64_TLS_DTPMOD64, |
| elfcpp::R_AARCH64_TLS_DTPREL64); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial executable |
| { |
| tls::Tls_optimization tlsopt =Target_aarch64<size, big_endian>:: |
| optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| if (tlsopt == tls::TLSOPT_TO_LE) |
| break; |
| |
| layout->set_has_static_tls(); |
| // Create a GOT entry for the tp-relative offset. |
| Output_data_got_aarch64<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| if (!parameters->doing_static_link()) |
| { |
| got->add_global_with_rel( |
| gsym, GOT_TYPE_TLS_OFFSET, |
| target->rela_dyn_section(layout), |
| elfcpp::R_AARCH64_TLS_TPREL64); |
| } |
| if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)) |
| { |
| got->add_global(gsym, GOT_TYPE_TLS_OFFSET); |
| unsigned int got_offset = |
| gsym->got_offset(GOT_TYPE_TLS_OFFSET); |
| const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| gold_assert(addend == 0); |
| got->add_static_reloc(got_offset, |
| elfcpp::R_AARCH64_TLS_TPREL64, gsym); |
| } |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: // Local executable |
| layout->set_has_static_tls(); |
| if (parameters->options().shared()) |
| gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."), |
| object->name().c_str(), r_type); |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: // TLS descriptor |
| { |
| target->define_tls_base_symbol(symtab, layout); |
| tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| if (tlsopt == tls::TLSOPT_NONE) |
| { |
| // Create reserved PLT and GOT entries for the resolver. |
| target->reserve_tlsdesc_entries(symtab, layout); |
| |
| // Create a double GOT entry with an R_AARCH64_TLSDESC |
| // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT |
| // entry needs to be in an area in .got.plt, not .got. Call |
| // got_section to make sure the section has been created. |
| target->got_section(symtab, layout); |
| Output_data_got<size, big_endian>* got = |
| target->got_tlsdesc_section(); |
| Reloc_section* rt = target->rela_tlsdesc_section(layout); |
| got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
| elfcpp::R_AARCH64_TLSDESC, 0); |
| } |
| else if (tlsopt == tls::TLSOPT_TO_IE) |
| { |
| // Create a GOT entry for the tp-relative offset. |
| Output_data_got<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
| target->rela_dyn_section(layout), |
| elfcpp::R_AARCH64_TLS_TPREL64); |
| } |
| else if (tlsopt != tls::TLSOPT_TO_LE) |
| unsupported_reloc_global(object, r_type, gsym); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_CALL: |
| break; |
| |
| default: |
| gold_error(_("%s: unsupported reloc type in global scan"), |
| aarch64_reloc_property_table-> |
| reloc_name_in_error_message(r_type).c_str()); |
| } |
| return; |
| } // End of Scan::global |
| |
| |
| // Create the PLT section. |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::make_plt_section( |
| Symbol_table* symtab, Layout* layout) |
| { |
| if (this->plt_ == NULL) |
| { |
| // Create the GOT section first. |
| this->got_section(symtab, layout); |
| |
| this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
| this->got_irelative_); |
| |
| layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
| (elfcpp::SHF_ALLOC |
| | elfcpp::SHF_EXECINSTR), |
| this->plt_, ORDER_PLT, false); |
| |
| // Make the sh_info field of .rela.plt point to .plt. |
| Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); |
| rela_plt_os->set_info_section(this->plt_->output_section()); |
| } |
| } |
| |
| // Return the section for TLSDESC relocations. |
| |
| template<int size, bool big_endian> |
| typename Target_aarch64<size, big_endian>::Reloc_section* |
| Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const |
| { |
| return this->plt_section()->rela_tlsdesc(layout); |
| } |
| |
| // Create a PLT entry for a global symbol. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::make_plt_entry( |
| Symbol_table* symtab, |
| Layout* layout, |
| Symbol* gsym) |
| { |
| if (gsym->has_plt_offset()) |
| return; |
| |
| if (this->plt_ == NULL) |
| this->make_plt_section(symtab, layout); |
| |
| this->plt_->add_entry(gsym); |
| } |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::gc_process_relocs( |
| Symbol_table* symtab, |
| Layout* layout, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| bool needs_special_offset_handling, |
| size_t local_symbol_count, |
| const unsigned char* plocal_symbols) |
| { |
| if (sh_type == elfcpp::SHT_REL) |
| { |
| return; |
| } |
| |
| gold::gc_process_relocs< |
| size, big_endian, |
| Target_aarch64<size, big_endian>, |
| elfcpp::SHT_RELA, |
| typename Target_aarch64<size, big_endian>::Scan, |
| typename Target_aarch64<size, big_endian>::Relocatable_size_for_reloc>( |
| symtab, |
| layout, |
| this, |
| object, |
| data_shndx, |
| prelocs, |
| reloc_count, |
| output_section, |
| needs_special_offset_handling, |
| local_symbol_count, |
| plocal_symbols); |
| } |
| |
| // Scan relocations for a section. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::scan_relocs( |
| Symbol_table* symtab, |
| Layout* layout, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| bool needs_special_offset_handling, |
| size_t local_symbol_count, |
| const unsigned char* plocal_symbols) |
| { |
| if (sh_type == elfcpp::SHT_REL) |
| { |
| gold_error(_("%s: unsupported REL reloc section"), |
| object->name().c_str()); |
| return; |
| } |
| gold::scan_relocs<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, Scan>( |
| symtab, |
| layout, |
| this, |
| object, |
| data_shndx, |
| prelocs, |
| reloc_count, |
| output_section, |
| needs_special_offset_handling, |
| local_symbol_count, |
| plocal_symbols); |
| } |
| |
| // Return the value to use for a dynamic 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<int size,bool big_endian> |
| uint64_t |
| Target_aarch64<size,big_endian>::do_dynsym_value(const Symbol* gsym) const |
| { |
| gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
| return this->plt_address_for_global(gsym); |
| } |
| |
| // Finalize the sections. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::do_finalize_sections( |
| Layout* layout, |
| const Input_objects*, |
| Symbol_table* symtab) |
| { |
| const Reloc_section* rel_plt = (this->plt_ == NULL |
| ? NULL |
| : this->plt_->rela_plt()); |
| layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
| this->rela_dyn_, true, false); |
| |
| // 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->rela_dyn_section(layout)); |
| |
| // Fill in some more dynamic tags. |
| Output_data_dynamic* const odyn = layout->dynamic_data(); |
| if (odyn != NULL) |
| { |
| if (this->plt_ != NULL |
| && this->plt_->output_section() != NULL |
| && this->plt_ ->has_tlsdesc_entry()) |
| { |
| unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
| unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); |
| this->got_->finalize_data_size(); |
| odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, |
| this->plt_, plt_offset); |
| odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, |
| this->got_, got_offset); |
| } |
| } |
| |
| // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of |
| // the .got.plt section. |
| Symbol* sym = this->global_offset_table_; |
| if (sym != NULL) |
| { |
| uint64_t data_size = this->got_plt_->current_data_size(); |
| symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
| |
| // If the .got section is more than 0x8000 bytes, we add |
| // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16 |
| // bit relocations have a greater chance of working. |
| if (data_size >= 0x8000) |
| symtab->get_sized_symbol<size>(sym)->set_value( |
| symtab->get_sized_symbol<size>(sym)->value() + 0x8000); |
| } |
| |
| if (parameters->doing_static_link() |
| && (this->plt_ == NULL || !this->plt_->has_irelative_section())) |
| { |
| // If linking statically, make sure that the __rela_iplt symbols |
| // were defined if necessary, even if we didn't create a PLT. |
| static const Define_symbol_in_segment syms[] = |
| { |
| { |
| "__rela_iplt_start", // name |
| elfcpp::PT_LOAD, // segment_type |
| elfcpp::PF_W, // segment_flags_set |
| elfcpp::PF(0), // segment_flags_clear |
| 0, // value |
| 0, // size |
| elfcpp::STT_NOTYPE, // type |
| elfcpp::STB_GLOBAL, // binding |
| elfcpp::STV_HIDDEN, // visibility |
| 0, // nonvis |
| Symbol::SEGMENT_START, // offset_from_base |
| true // only_if_ref |
| }, |
| { |
| "__rela_iplt_end", // name |
| elfcpp::PT_LOAD, // segment_type |
| elfcpp::PF_W, // segment_flags_set |
| elfcpp::PF(0), // segment_flags_clear |
| 0, // value |
| 0, // size |
| elfcpp::STT_NOTYPE, // type |
| elfcpp::STB_GLOBAL, // binding |
| elfcpp::STV_HIDDEN, // visibility |
| 0, // nonvis |
| Symbol::SEGMENT_START, // offset_from_base |
| true // only_if_ref |
| } |
| }; |
| |
| symtab->define_symbols(layout, 2, syms, |
| layout->script_options()->saw_sections_clause()); |
| } |
| |
| return; |
| } |
| |
| // Perform a relocation. |
| |
| template<int size, bool big_endian> |
| inline bool |
| Target_aarch64<size, big_endian>::Relocate::relocate( |
| const Relocate_info<size, big_endian>* relinfo, |
| Target_aarch64<size, big_endian>* target, |
| Output_section* , |
| size_t relnum, |
| const elfcpp::Rela<size, big_endian>& rela, |
| unsigned int r_type, |
| const Sized_symbol<size>* gsym, |
| const Symbol_value<size>* psymval, |
| unsigned char* view, |
| typename elfcpp::Elf_types<size>::Elf_Addr address, |
| section_size_type /* view_size */) |
| { |
| if (view == NULL) |
| return true; |
| |
| typedef AArch64_relocate_functions<size, big_endian> Reloc; |
| |
| const AArch64_reloc_property* reloc_property = |
| aarch64_reloc_property_table->get_reloc_property(r_type); |
| |
| if (reloc_property == NULL) |
| { |
| std::string reloc_name = |
| aarch64_reloc_property_table->reloc_name_in_error_message(r_type); |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("cannot relocate %s in object file"), |
| reloc_name.c_str()); |
| return true; |
| } |
| |
| const Sized_relobj_file<size, big_endian>* object = relinfo->object; |
| |
| // Pick the value to use for symbols defined in the PLT. |
| Symbol_value<size> symval; |
| if (gsym != NULL |
| && gsym->use_plt_offset(reloc_property->reference_flags())) |
| { |
| symval.set_output_value(target->plt_address_for_global(gsym)); |
| psymval = &symval; |
| } |
| else if (gsym == NULL && psymval->is_ifunc_symbol()) |
| { |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| if (object->local_has_plt_offset(r_sym)) |
| { |
| symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
| psymval = &symval; |
| } |
| } |
| |
| const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| |
| // Get the GOT offset if needed. |
| // For aarch64, the GOT pointer points to the start of the GOT section. |
| bool have_got_offset = false; |
| int got_offset = 0; |
| int got_base = (target->got_ != NULL |
| ? (target->got_->current_data_size() >= 0x8000 |
| ? 0x8000 : 0) |
| : 0); |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_MOVW_GOTOFF_G0: |
| case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC: |
| case elfcpp::R_AARCH64_MOVW_GOTOFF_G1: |
| case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC: |
| case elfcpp::R_AARCH64_MOVW_GOTOFF_G2: |
| case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC: |
| case elfcpp::R_AARCH64_MOVW_GOTOFF_G3: |
| case elfcpp::R_AARCH64_GOTREL64: |
| case elfcpp::R_AARCH64_GOTREL32: |
| case elfcpp::R_AARCH64_GOT_LD_PREL19: |
| case elfcpp::R_AARCH64_LD64_GOTOFF_LO15: |
| case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15: |
| if (gsym != NULL) |
| { |
| gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
| got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base; |
| } |
| else |
| { |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
| got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) |
| - got_base); |
| } |
| have_got_offset = true; |
| break; |
| |
| default: |
| break; |
| } |
| |
| typename Reloc::Status reloc_status = Reloc::STATUS_OKAY; |
| typename elfcpp::Elf_types<size>::Elf_Addr value; |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_NONE: |
| break; |
| |
| case elfcpp::R_AARCH64_ABS64: |
| reloc_status = Reloc::template rela_ua<64>( |
| view, object, psymval, addend, reloc_property); |
| break; |
| |
| case elfcpp::R_AARCH64_ABS32: |
| reloc_status = Reloc::template rela_ua<32>( |
| view, object, psymval, addend, reloc_property); |
| break; |
| |
| case elfcpp::R_AARCH64_ABS16: |
| reloc_status = Reloc::template rela_ua<16>( |
| view, object, psymval, addend, reloc_property); |
| break; |
| |
| case elfcpp::R_AARCH64_PREL64: |
| reloc_status = Reloc::template pcrela_ua<64>( |
| view, object, psymval, addend, address, reloc_property); |
| |
| case elfcpp::R_AARCH64_PREL32: |
| reloc_status = Reloc::template pcrela_ua<32>( |
| view, object, psymval, addend, address, reloc_property); |
| |
| case elfcpp::R_AARCH64_PREL16: |
| reloc_status = Reloc::template pcrela_ua<16>( |
| view, object, psymval, addend, address, reloc_property); |
| |
| case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: |
| case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: |
| reloc_status = Reloc::adrp(view, object, psymval, addend, address, |
| reloc_property); |
| break; |
| |
| case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: |
| case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: |
| case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: |
| case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: |
| case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: |
| case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: |
| reloc_status = Reloc::template rela_general<32>( |
| view, object, psymval, addend, reloc_property); |
| break; |
| |
| case elfcpp::R_AARCH64_CALL26: |
| if (this->skip_call_tls_get_addr_) |
| { |
| // Double check that the TLSGD insn has been optimized away. |
| typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| Insntype insn = elfcpp::Swap<32, big_endian>::readval( |
| reinterpret_cast<Insntype*>(view)); |
| gold_assert((insn & 0xff000000) == 0x91000000); |
| |
| reloc_status = Reloc::STATUS_OKAY; |
| this->skip_call_tls_get_addr_ = false; |
| // Return false to stop further processing this reloc. |
| return false; |
| } |
| // Continue. |
| case elfcpp::R_AARCH64_TSTBR14: |
| case elfcpp::R_AARCH64_CONDBR19: |
| case elfcpp::R_AARCH64_JUMP26: |
| reloc_status = Reloc::template pcrela_general<32>( |
| view, object, psymval, addend, address, reloc_property); |
| break; |
| |
| case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| gold_assert(have_got_offset); |
| value = target->got_->address() + got_base + got_offset; |
| reloc_status = Reloc::adrp(view, value + addend, address); |
| break; |
| |
| case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| gold_assert(have_got_offset); |
| value = target->got_->address() + got_base + got_offset; |
| reloc_status = Reloc::template rela_general<32>( |
| view, value, addend, reloc_property); |
| break; |
| |
| case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_CALL: |
| reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type, |
| gsym, psymval, view, address); |
| break; |
| |
| // These are dynamic relocations, which are unexpected when linking. |
| case elfcpp::R_AARCH64_COPY: |
| case elfcpp::R_AARCH64_GLOB_DAT: |
| case elfcpp::R_AARCH64_JUMP_SLOT: |
| case elfcpp::R_AARCH64_RELATIVE: |
| case elfcpp::R_AARCH64_IRELATIVE: |
| case elfcpp::R_AARCH64_TLS_DTPREL64: |
| case elfcpp::R_AARCH64_TLS_DTPMOD64: |
| case elfcpp::R_AARCH64_TLS_TPREL64: |
| case elfcpp::R_AARCH64_TLSDESC: |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("unexpected reloc %u in object file"), |
| r_type); |
| break; |
| |
| default: |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("unsupported reloc %s"), |
| reloc_property->name().c_str()); |
| break; |
| } |
| |
| // Report any errors. |
| switch (reloc_status) |
| { |
| case Reloc::STATUS_OKAY: |
| break; |
| case Reloc::STATUS_OVERFLOW: |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("relocation overflow in %s"), |
| reloc_property->name().c_str()); |
| break; |
| case Reloc::STATUS_BAD_RELOC: |
| gold_error_at_location( |
| relinfo, |
| relnum, |
| rela.get_r_offset(), |
| _("unexpected opcode while processing relocation %s"), |
| reloc_property->name().c_str()); |
| break; |
| default: |
| gold_unreachable(); |
| } |
| |
| return true; |
| } |
| |
| |
| template<int size, bool big_endian> |
| inline |
| typename AArch64_relocate_functions<size,big_endian>::Status |
| Target_aarch64<size, big_endian>::Relocate::relocate_tls( |
| const Relocate_info<size,big_endian>* relinfo, |
| Target_aarch64<size, big_endian>* target, |
| size_t relnum, |
| const elfcpp::Rela<size, big_endian>& rela, |
| unsigned int r_type, const Sized_symbol<size>* gsym, |
| const Symbol_value<size>* psymval, |
| unsigned char* view, |
| typename elfcpp::Elf_types<size>::Elf_Addr address) |
| { |
| typedef AArch64_relocate_functions<size,big_endian> aarch64_reloc_funcs; |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| |
| Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| const AArch64_reloc_property* reloc_property = |
| aarch64_reloc_property_table->get_reloc_property(r_type); |
| gold_assert(reloc_property != NULL); |
| |
| const bool is_final = (gsym == NULL |
| ? !parameters->options().shared() |
| : gsym->final_value_is_known()); |
| tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| optimize_tls_reloc(is_final, r_type); |
| |
| Sized_relobj_file<size,big_endian>* object = relinfo->object; |
| int tls_got_offset_type; |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // Global-dynamic |
| { |
| if (tlsopt == tls::TLSOPT_TO_LE) |
| { |
| if (tls_segment == NULL) |
| { |
| gold_assert(parameters->errors()->error_count() > 0 |
| || issue_undefined_symbol_error(gsym)); |
| return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| } |
| return tls_gd_to_le(relinfo, target, rela, r_type, view, |
| psymval); |
| } |
| else if (tlsopt == tls::TLSOPT_NONE) |
| { |
| tls_got_offset_type = GOT_TYPE_TLS_PAIR; |
| // Firstly get the address for the got entry. |
| typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| if (gsym != NULL) |
| { |
| gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| got_entry_address = target->got_->address() + |
| gsym->got_offset(tls_got_offset_type); |
| } |
| else |
| { |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| gold_assert( |
| object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| got_entry_address = target->got_->address() + |
| object->local_got_offset(r_sym, tls_got_offset_type); |
| } |
| |
| // Relocate the address into adrp/ld, adrp/add pair. |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| return aarch64_reloc_funcs::adrp( |
| view, got_entry_address + addend, address); |
| |
| break; |
| |
| case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| return aarch64_reloc_funcs::template rela_general<32>( |
| view, got_entry_address, addend, reloc_property); |
| break; |
| |
| default: |
| gold_assert(false); |
| } |
| } |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("unsupported gd_to_ie relaxation on %u"), |
| r_type); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial-exec |
| { |
| if (tlsopt == tls::TLSOPT_TO_LE) |
| { |
| if (tls_segment == NULL) |
| { |
| gold_assert(parameters->errors()->error_count() > 0 |
| || issue_undefined_symbol_error(gsym)); |
| return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| } |
| return tls_ie_to_le(relinfo, target, rela, r_type, view, |
| psymval); |
| } |
| tls_got_offset_type = GOT_TYPE_TLS_OFFSET; |
| |
| // Firstly get the address for the got entry. |
| typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| if (gsym != NULL) |
| { |
| gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| got_entry_address = target->got_->address() + |
| gsym->got_offset(tls_got_offset_type); |
| } |
| else |
| { |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| gold_assert( |
| object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| got_entry_address = target->got_->address() + |
| object->local_got_offset(r_sym, tls_got_offset_type); |
| } |
| // Relocate the address into adrp/ld, adrp/add pair. |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, |
| address); |
| break; |
| case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| return aarch64_reloc_funcs::template rela_general<32>( |
| view, got_entry_address, addend, reloc_property); |
| default: |
| gold_assert(false); |
| } |
| } |
| // We shall never reach here. |
| break; |
| |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| { |
| gold_assert(tls_segment != NULL); |
| AArch64_address value = psymval->value(object, 0); |
| |
| if (!parameters->options().shared()) |
| { |
| AArch64_address aligned_tcb_size = |
| align_address(target->tcb_size(), |
| tls_segment->maximum_alignment()); |
| return aarch64_reloc_funcs::template |
| rela_general<32>(view, |
| value + aligned_tcb_size, |
| addend, |
| reloc_property); |
| } |
| else |
| gold_error(_("%s: unsupported reloc %u " |
| "in non-static TLSLE mode."), |
| object->name().c_str(), r_type); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_CALL: |
| { |
| if (tlsopt == tls::TLSOPT_TO_LE) |
| { |
| if (tls_segment == NULL) |
| { |
| gold_assert(parameters->errors()->error_count() > 0 |
| || issue_undefined_symbol_error(gsym)); |
| return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| } |
| return tls_desc_gd_to_le(relinfo, target, rela, r_type, |
| view, psymval); |
| } |
| else |
| { |
| tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE |
| ? GOT_TYPE_TLS_OFFSET |
| : GOT_TYPE_TLS_DESC); |
| unsigned int got_tlsdesc_offset = 0; |
| if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL |
| && tlsopt == tls::TLSOPT_NONE) |
| { |
| // We created GOT entries in the .got.tlsdesc portion of the |
| // .got.plt section, but the offset stored in the symbol is the |
| // offset within .got.tlsdesc. |
| got_tlsdesc_offset = (target->got_->data_size() |
| + target->got_plt_section()->data_size()); |
| } |
| typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| if (gsym != NULL) |
| { |
| gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| got_entry_address = target->got_->address() |
| + got_tlsdesc_offset |
| + gsym->got_offset(tls_got_offset_type); |
| } |
| else |
| { |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| gold_assert( |
| object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| got_entry_address = target->got_->address() + |
| got_tlsdesc_offset + |
| object->local_got_offset(r_sym, tls_got_offset_type); |
| } |
| if (tlsopt == tls::TLSOPT_TO_IE) |
| { |
| if (tls_segment == NULL) |
| { |
| gold_assert(parameters->errors()->error_count() > 0 |
| || issue_undefined_symbol_error(gsym)); |
| return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| } |
| return tls_desc_gd_to_ie(relinfo, target, rela, r_type, |
| view, psymval, got_entry_address, |
| address); |
| } |
| |
| // Now do tlsdesc relocation. |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| return aarch64_reloc_funcs::adrp(view, |
| got_entry_address + addend, |
| address); |
| break; |
| case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| return aarch64_reloc_funcs::template rela_general<32>( |
| view, got_entry_address, addend, reloc_property); |
| break; |
| case elfcpp::R_AARCH64_TLSDESC_CALL: |
| return aarch64_reloc_funcs::STATUS_OKAY; |
| break; |
| default: |
| gold_unreachable(); |
| } |
| } |
| } |
| break; |
| |
| default: |
| gold_error(_("%s: unsupported TLS reloc %u."), |
| object->name().c_str(), r_type); |
| } |
| return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| } // End of relocate_tls. |
| |
| |
| template<int size, bool big_endian> |
| inline |
| typename AArch64_relocate_functions<size,big_endian>::Status |
| Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le( |
| const Relocate_info<size,big_endian>* relinfo, |
| Target_aarch64<size, big_endian>* target, |
| const elfcpp::Rela<size, big_endian>& rela, |
| unsigned int r_type, |
| unsigned char* view, |
| const Symbol_value<size>* psymval) |
| { |
| typedef AArch64_relocate_functions<size,big_endian> aarch64_reloc_funcs; |
| typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| |
| Insntype* ip = reinterpret_cast<Insntype*>(view); |
| Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); |
| Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); |
| Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); |
| |
| if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC) |
| { |
| // This is the 2nd relocs, optimization should already have been |
| // done. |
| gold_assert((insn1 & 0xfff00000) == 0x91400000); |
| return aarch64_reloc_funcs::STATUS_OKAY; |
| } |
| |
| // The original sequence is - |
| // 90000000 adrp x0, 0 <main> |
| // 91000000 add x0, x0, #0x0 |
| // 94000000 bl 0 <__tls_get_addr> |
| // optimized to sequence - |
| // d53bd040 mrs x0, tpidr_el0 |
| // 91400000 add x0, x0, #0x0, lsl #12 |
| // 91000000 add x0, x0, #0x0 |
| |
| // Unlike tls_ie_to_le, we change the 3 insns in one function call when we |
| // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we |
| // have to change "bl tls_get_addr", which does not have a corresponding tls |
| // relocation type. So before proceeding, we need to make sure compiler |
| // does not change the sequence. |
| if(!(insn1 == 0x90000000 // adrp x0,0 |
| && insn2 == 0x91000000 // add x0, x0, #0x0 |
| && insn3 == 0x94000000)) // bl 0 |
| { |
| // Ideally we should give up gd_to_le relaxation and do gd access. |
| // However the gd_to_le relaxation decision has been made early |
| // in the scan stage, where we did not allocate any GOT entry for |
| // this symbol. Therefore we have to exit and report error now. |
| gold_error(_("unexpected reloc insn sequence while relaxing " |
| "tls gd to le for reloc %u."), r_type); |
| return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| } |
| |
| // Write new insns. |
| insn1 = 0xd53bd040; // mrs x0, tpidr_el0 |
| insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 |
| insn3 = 0x91000000; // add x0, x0, #0x0 |
| elfcpp::Swap<32, big_endian>::writeval(ip, insn1); |
| elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); |
| elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); |
| |
| // Calculate tprel value. |
| Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| gold_assert(tls_segment != NULL); |
| AArch64_address value = psymval->value(relinfo->object, 0); |
| const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| AArch64_address aligned_tcb_size = |
| align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| AArch64_address x = value + aligned_tcb_size; |
| |
| // After new insns are written, apply TLSLE relocs. |
| const AArch64_reloc_property* rp1 = |
| aarch64_reloc_property_table->get_reloc_property( |
| elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); |
| const AArch64_reloc_property* rp2 = |
| aarch64_reloc_property_table->get_reloc_property( |
| elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); |
| gold_assert(rp1 != NULL && rp2 != NULL); |
| |
| typename aarch64_reloc_funcs::Status s1 = |
| aarch64_reloc_funcs::template rela_general<32>(view + 4, |
| x, |
| addend, |
| rp1); |
| if (s1 != aarch64_reloc_funcs::STATUS_OKAY) |
| return s1; |
| |
| typename aarch64_reloc_funcs::Status s2 = |
| aarch64_reloc_funcs::template rela_general<32>(view + 8, |
| x, |
| addend, |
| rp2); |
| |
| this->skip_call_tls_get_addr_ = true; |
| return s2; |
| } // End of tls_gd_to_le |
| |
| |
| template<int size, bool big_endian> |
| inline |
| typename AArch64_relocate_functions<size,big_endian>::Status |
| Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le( |
| const Relocate_info<size,big_endian>* relinfo, |
| Target_aarch64<size, big_endian>* target, |
| const elfcpp::Rela<size, big_endian>& rela, |
| unsigned int r_type, |
| unsigned char* view, |
| const Symbol_value<size>* psymval) |
| { |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| typedef AArch64_relocate_functions<size,big_endian> aarch64_reloc_funcs; |
| |
| AArch64_address value = psymval->value(relinfo->object, 0); |
| Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| AArch64_address aligned_tcb_address = |
| align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| AArch64_address x = value + addend + aligned_tcb_address; |
| // "x" is the offset to tp, we can only do this if x is within |
| // range [0, 2^32-1] |
| if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0))) |
| { |
| gold_error(_("TLS variable referred by reloc %u is too far from TP."), |
| r_type); |
| return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| } |
| |
| Insntype* ip = reinterpret_cast<Insntype*>(view); |
| Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); |
| unsigned int regno; |
| Insntype newinsn; |
| if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21) |
| { |
| // Generate movz. |
| regno = (insn & 0x1f); |
| newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5); |
| } |
| else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC) |
| { |
| // Generate movk. |
| regno = (insn & 0x1f); |
| gold_assert(regno == ((insn >> 5) & 0x1f)); |
| newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5); |
| } |
| else |
| gold_assert(false); |
| |
| elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| return aarch64_reloc_funcs::STATUS_OKAY; |
| } // End of tls_ie_to_le |
| |
| |
| template<int size, bool big_endian> |
| inline |
| typename AArch64_relocate_functions<size,big_endian>::Status |
| Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le( |
| const Relocate_info<size,big_endian>* relinfo, |
| Target_aarch64<size, big_endian>* target, |
| const elfcpp::Rela<size, big_endian>& rela, |
| unsigned int r_type, |
| unsigned char* view, |
| const Symbol_value<size>* psymval) |
| { |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| typedef AArch64_relocate_functions<size,big_endian> aarch64_reloc_funcs; |
| |
| // TLSDESC-GD sequence is like: |
| // adrp x0, :tlsdesc:v1 |
| // ldr x1, [x0, #:tlsdesc_lo12:v1] |
| // add x0, x0, :tlsdesc_lo12:v1 |
| // .tlsdesccall v1 |
| // blr x1 |
| // After desc_gd_to_le optimization, the sequence will be like: |
| // movz x0, #0x0, lsl #16 |
| // movk x0, #0x10 |
| // nop |
| // nop |
| |
| // Calculate tprel value. |
| Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| gold_assert(tls_segment != NULL); |
| Insntype* ip = reinterpret_cast<Insntype*>(view); |
| const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| AArch64_address value = psymval->value(relinfo->object, addend); |
| AArch64_address aligned_tcb_size = |
| align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| AArch64_address x = value + aligned_tcb_size; |
| // x is the offset to tp, we can only do this if x is within range |
| // [0, 2^32-1]. If x is out of range, fail and exit. |
| if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0) |
| { |
| gold_error(_("TLS variable referred by reloc %u is too far from TP. " |
| "We Can't do gd_to_le relaxation.\n"), r_type); |
| return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| } |
| Insntype newinsn; |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_CALL: |
| // Change to nop |
| newinsn = 0xd503201f; |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| // Change to movz. |
| newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5); |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| // Change to movk. |
| newinsn = 0xf2800000 | ((x & 0xffff) << 5); |
| break; |
| |
| default: |
| gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"), |
| r_type); |
| gold_unreachable(); |
| } |
| elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| return aarch64_reloc_funcs::STATUS_OKAY; |
| } // End of tls_desc_gd_to_le |
| |
| |
| template<int size, bool big_endian> |
| inline |
| typename AArch64_relocate_functions<size,big_endian>::Status |
| Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie( |
| const Relocate_info<size,big_endian>* /* relinfo */, |
| Target_aarch64<size, big_endian>* /* target */, |
| const elfcpp::Rela<size, big_endian>& rela, |
| unsigned int r_type, |
| unsigned char* view, |
| const Symbol_value<size>* /* psymval */, |
| typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address, |
| typename elfcpp::Elf_types<size>::Elf_Addr address) |
| { |
| typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| typedef AArch64_relocate_functions<size,big_endian> aarch64_reloc_funcs; |
| |
| // TLSDESC-GD sequence is like: |
| // adrp x0, :tlsdesc:v1 |
| // ldr x1, [x0, #:tlsdesc_lo12:v1] |
| // add x0, x0, :tlsdesc_lo12:v1 |
| // .tlsdesccall v1 |
| // blr x1 |
| // After desc_gd_to_ie optimization, the sequence will be like: |
| // adrp x0, :tlsie:v1 |
| // ldr x0, [x0, :tlsie_lo12:v1] |
| // nop |
| // nop |
| |
| Insntype* ip = reinterpret_cast<Insntype*>(view); |
| const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| Insntype newinsn; |
| switch (r_type) |
| { |
| case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| case elfcpp::R_AARCH64_TLSDESC_CALL: |
| // Change to nop |
| newinsn = 0xd503201f; |
| elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| { |
| return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, |
| address); |
| } |
| break; |
| |
| case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| { |
| const AArch64_reloc_property* reloc_property = |
| aarch64_reloc_property_table->get_reloc_property( |
| elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC); |
| return aarch64_reloc_funcs::template rela_general<32>( |
| view, got_entry_address, addend, reloc_property); |
| } |
| break; |
| |
| default: |
| gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"), |
| r_type); |
| gold_unreachable(); |
| } |
| return aarch64_reloc_funcs::STATUS_OKAY; |
| } // End of tls_desc_gd_to_ie |
| |
| // Relocate section data. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::relocate_section( |
| const Relocate_info<size, big_endian>* relinfo, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| bool needs_special_offset_handling, |
| unsigned char* view, |
| typename elfcpp::Elf_types<size>::Elf_Addr address, |
| section_size_type view_size, |
| const Reloc_symbol_changes* reloc_symbol_changes) |
| { |
| gold_assert(sh_type == elfcpp::SHT_RELA); |
| typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate; |
| gold::relocate_section<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, |
| AArch64_relocate, gold::Default_comdat_behavior>( |
| relinfo, |
| this, |
| prelocs, |
| reloc_count, |
| output_section, |
| needs_special_offset_handling, |
| view, |
| address, |
| view_size, |
| reloc_symbol_changes); |
| } |
| |
| // Return the size of a relocation while scanning during a relocatable |
| // link. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Target_aarch64<size, big_endian>::Relocatable_size_for_reloc:: |
| get_size_for_reloc( |
| unsigned int , |
| Relobj* ) |
| { |
| // We will never support SHT_REL relocations. |
| gold_unreachable(); |
| return 0; |
| } |
| |
| // Scan the relocs during a relocatable link. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::scan_relocatable_relocs( |
| Symbol_table* symtab, |
| Layout* layout, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| bool needs_special_offset_handling, |
| size_t local_symbol_count, |
| const unsigned char* plocal_symbols, |
| Relocatable_relocs* rr) |
| { |
| gold_assert(sh_type == elfcpp::SHT_RELA); |
| |
| typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, |
| Relocatable_size_for_reloc> Scan_relocatable_relocs; |
| |
| gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, |
| Scan_relocatable_relocs>( |
| symtab, |
| layout, |
| object, |
| data_shndx, |
| prelocs, |
| reloc_count, |
| output_section, |
| needs_special_offset_handling, |
| local_symbol_count, |
| plocal_symbols, |
| rr); |
| } |
| |
| // Relocate a section during a relocatable link. |
| |
| template<int size, bool big_endian> |
| void |
| Target_aarch64<size, big_endian>::relocate_relocs( |
| const Relocate_info<size, big_endian>* relinfo, |
| unsigned int sh_type, |
| const unsigned char* prelocs, |
| size_t reloc_count, |
| Output_section* output_section, |
| typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| const Relocatable_relocs* rr, |
| unsigned char* view, |
| typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| section_size_type view_size, |
| unsigned char* reloc_view, |
| section_size_type reloc_view_size) |
| { |
| gold_assert(sh_type == elfcpp::SHT_RELA); |
| |
| gold::relocate_relocs<size, big_endian, elfcpp::SHT_RELA>( |
| relinfo, |
| prelocs, |
| reloc_count, |
| output_section, |
| offset_in_output_section, |
| rr, |
| view, |
| view_address, |
| view_size, |
| reloc_view, |
| reloc_view_size); |
| } |
| |
| // The selector for aarch64 object files. |
| |
| template<int size, bool big_endian> |
| class Target_selector_aarch64 : public Target_selector |
| { |
| public: |
| Target_selector_aarch64(); |
| |
| virtual Target* |
| do_instantiate_target() |
| { return new Target_aarch64<size, big_endian>(); } |
| }; |
| |
| template<> |
| Target_selector_aarch64<32, true>::Target_selector_aarch64() |
| : Target_selector(elfcpp::EM_AARCH64, 32, true, |
| "elf32-bigaarch64", "aarch64_elf32_be_vec") |
| { } |
| |
| template<> |
| Target_selector_aarch64<32, false>::Target_selector_aarch64() |
| : Target_selector(elfcpp::EM_AARCH64, 32, false, |
| "elf32-littleaarch64", "aarch64_elf32_le_vec") |
| { } |
| |
| template<> |
| Target_selector_aarch64<64, true>::Target_selector_aarch64() |
| : Target_selector(elfcpp::EM_AARCH64, 64, true, |
| "elf64-bigaarch64", "aarch64_elf64_be_vec") |
| { } |
| |
| template<> |
| Target_selector_aarch64<64, false>::Target_selector_aarch64() |
| : Target_selector(elfcpp::EM_AARCH64, 64, false, |
| "elf64-littleaarch64", "aarch64_elf64_le_vec") |
| { } |
| |
| Target_selector_aarch64<32, true> target_selector_aarch64elf32b; |
| Target_selector_aarch64<32, false> target_selector_aarch64elf32; |
| Target_selector_aarch64<64, true> target_selector_aarch64elfb; |
| Target_selector_aarch64<64, false> target_selector_aarch64elf; |
| |
| } // End anonymous namespace. |