| // powerpc.cc -- powerpc target support for gold. |
| |
| // Copyright 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. |
| // Written by David S. Miller <davem@davemloft.net> |
| // and David Edelsohn <edelsohn@gnu.org> |
| |
| // 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 "elfcpp.h" |
| #include "parameters.h" |
| #include "reloc.h" |
| #include "powerpc.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 "errors.h" |
| #include "gc.h" |
| |
| namespace |
| { |
| |
| using namespace gold; |
| |
| template<int size, bool big_endian> |
| class Output_data_plt_powerpc; |
| |
| template<int size, bool big_endian> |
| class Output_data_got_powerpc; |
| |
| template<int size, bool big_endian> |
| class Output_data_glink; |
| |
| template<int size, bool big_endian> |
| class Powerpc_relobj : public Sized_relobj_file<size, big_endian> |
| { |
| public: |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| typedef typename elfcpp::Elf_types<size>::Elf_Off Offset; |
| typedef Unordered_set<Section_id, Section_id_hash> Section_refs; |
| typedef Unordered_map<Address, Section_refs> Access_from; |
| |
| Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset, |
| const typename elfcpp::Ehdr<size, big_endian>& ehdr) |
| : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), |
| special_(0), opd_valid_(false), opd_ent_(), access_from_map_() |
| { } |
| |
| ~Powerpc_relobj() |
| { } |
| |
| // The .got2 section shndx. |
| unsigned int |
| got2_shndx() const |
| { |
| if (size == 32) |
| return this->special_; |
| else |
| return 0; |
| } |
| |
| // The .opd section shndx. |
| unsigned int |
| opd_shndx() const |
| { |
| if (size == 32) |
| return 0; |
| else |
| return this->special_; |
| } |
| |
| // Init OPD entry arrays. |
| void |
| init_opd(size_t opd_size) |
| { |
| size_t count = this->opd_ent_ndx(opd_size); |
| this->opd_ent_.resize(count); |
| } |
| |
| // Return section and offset of function entry for .opd + R_OFF. |
| unsigned int |
| get_opd_ent(Address r_off, Address* value = NULL) const |
| { |
| size_t ndx = this->opd_ent_ndx(r_off); |
| gold_assert(ndx < this->opd_ent_.size()); |
| gold_assert(this->opd_ent_[ndx].shndx != 0); |
| if (value != NULL) |
| *value = this->opd_ent_[ndx].off; |
| return this->opd_ent_[ndx].shndx; |
| } |
| |
| // Set section and offset of function entry for .opd + R_OFF. |
| void |
| set_opd_ent(Address r_off, unsigned int shndx, Address value) |
| { |
| size_t ndx = this->opd_ent_ndx(r_off); |
| gold_assert(ndx < this->opd_ent_.size()); |
| this->opd_ent_[ndx].shndx = shndx; |
| this->opd_ent_[ndx].off = value; |
| } |
| |
| // Return discard flag for .opd + R_OFF. |
| bool |
| get_opd_discard(Address r_off) const |
| { |
| size_t ndx = this->opd_ent_ndx(r_off); |
| gold_assert(ndx < this->opd_ent_.size()); |
| return this->opd_ent_[ndx].discard; |
| } |
| |
| // Set discard flag for .opd + R_OFF. |
| void |
| set_opd_discard(Address r_off) |
| { |
| size_t ndx = this->opd_ent_ndx(r_off); |
| gold_assert(ndx < this->opd_ent_.size()); |
| this->opd_ent_[ndx].discard = true; |
| } |
| |
| Access_from* |
| access_from_map() |
| { return &this->access_from_map_; } |
| |
| // Add a reference from SRC_OBJ, SRC_INDX to this object's .opd |
| // section at DST_OFF. |
| void |
| add_reference(Object* src_obj, |
| unsigned int src_indx, |
| typename elfcpp::Elf_types<size>::Elf_Addr dst_off) |
| { |
| Section_id src_id(src_obj, src_indx); |
| this->access_from_map_[dst_off].insert(src_id); |
| } |
| |
| // Add a reference to the code section specified by the .opd entry |
| // at DST_OFF |
| void |
| add_gc_mark(typename elfcpp::Elf_types<size>::Elf_Addr dst_off) |
| { |
| size_t ndx = this->opd_ent_ndx(dst_off); |
| if (ndx >= this->opd_ent_.size()) |
| this->opd_ent_.resize(ndx + 1); |
| this->opd_ent_[ndx].gc_mark = true; |
| } |
| |
| void |
| process_gc_mark(Symbol_table* symtab) |
| { |
| for (size_t i = 0; i < this->opd_ent_.size(); i++) |
| if (this->opd_ent_[i].gc_mark) |
| { |
| unsigned int shndx = this->opd_ent_[i].shndx; |
| symtab->gc()->worklist().push(Section_id(this, shndx)); |
| } |
| } |
| |
| bool |
| opd_valid() const |
| { return this->opd_valid_; } |
| |
| void |
| set_opd_valid() |
| { this->opd_valid_ = true; } |
| |
| // Examine .rela.opd to build info about function entry points. |
| void |
| scan_opd_relocs(size_t reloc_count, |
| const unsigned char* prelocs, |
| const unsigned char* plocal_syms); |
| |
| void |
| do_read_relocs(Read_relocs_data*); |
| |
| bool |
| do_find_special_sections(Read_symbols_data* sd); |
| |
| // Adjust this local symbol value. Return false if the symbol |
| // should be discarded from the output file. |
| bool |
| do_adjust_local_symbol(Symbol_value<size>* lv) const |
| { |
| if (size == 64 && this->opd_shndx() != 0) |
| { |
| bool is_ordinary; |
| if (lv->input_shndx(&is_ordinary) != this->opd_shndx()) |
| return true; |
| if (this->get_opd_discard(lv->input_value())) |
| return false; |
| } |
| return true; |
| } |
| |
| // Return offset in output GOT section that this object will use |
| // as a TOC pointer. Won't be just a constant with multi-toc support. |
| Address |
| toc_base_offset() const |
| { return 0x8000; } |
| |
| private: |
| struct Opd_ent |
| { |
| unsigned int shndx; |
| bool discard : 1; |
| bool gc_mark : 1; |
| Offset off; |
| }; |
| |
| // Return index into opd_ent_ array for .opd entry at OFF. |
| // .opd entries are 24 bytes long, but they can be spaced 16 bytes |
| // apart when the language doesn't use the last 8-byte word, the |
| // environment pointer. Thus dividing the entry section offset by |
| // 16 will give an index into opd_ent_ that works for either layout |
| // of .opd. (It leaves some elements of the vector unused when .opd |
| // entries are spaced 24 bytes apart, but we don't know the spacing |
| // until relocations are processed, and in any case it is possible |
| // for an object to have some entries spaced 16 bytes apart and |
| // others 24 bytes apart.) |
| size_t |
| opd_ent_ndx(size_t off) const |
| { return off >> 4;} |
| |
| // For 32-bit the .got2 section shdnx, for 64-bit the .opd section shndx. |
| unsigned int special_; |
| |
| // Set at the start of gc_process_relocs, when we know opd_ent_ |
| // vector is valid. The flag could be made atomic and set in |
| // do_read_relocs with memory_order_release and then tested with |
| // memory_order_acquire, potentially resulting in fewer entries in |
| // access_from_map_. |
| bool opd_valid_; |
| |
| // The first 8-byte word of an OPD entry gives the address of the |
| // entry point of the function. Relocatable object files have a |
| // relocation on this word. The following vector records the |
| // section and offset specified by these relocations. |
| std::vector<Opd_ent> opd_ent_; |
| |
| // References made to this object's .opd section when running |
| // gc_process_relocs for another object, before the opd_ent_ vector |
| // is valid for this object. |
| Access_from access_from_map_; |
| }; |
| |
| template<int size, bool big_endian> |
| class Target_powerpc : public Sized_target<size, big_endian> |
| { |
| public: |
| typedef |
| Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section; |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| typedef typename elfcpp::Elf_types<size>::Elf_Swxword Signed_address; |
| static const Address invalid_address = static_cast<Address>(0) - 1; |
| // Offset of tp and dtp pointers from start of TLS block. |
| static const Address tp_offset = 0x7000; |
| static const Address dtp_offset = 0x8000; |
| |
| Target_powerpc() |
| : Sized_target<size, big_endian>(&powerpc_info), |
| got_(NULL), plt_(NULL), iplt_(NULL), glink_(NULL), rela_dyn_(NULL), |
| copy_relocs_(elfcpp::R_POWERPC_COPY), |
| dynbss_(NULL), tlsld_got_offset_(-1U) |
| { |
| } |
| |
| // Process 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); |
| |
| // Map input .toc section to output .got section. |
| const char* |
| do_output_section_name(const Relobj*, const char* name, size_t* plen) const |
| { |
| if (size == 64 && strcmp(name, ".toc") == 0) |
| { |
| *plen = 4; |
| return ".got"; |
| } |
| return NULL; |
| } |
| |
| // 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; |
| |
| // Return the PLT address to use for a local symbol. |
| uint64_t |
| do_plt_address_for_local(const Relobj*, unsigned int) const; |
| |
| // Return the PLT address to use for a global symbol. |
| uint64_t |
| do_plt_address_for_global(const Symbol*) const; |
| |
| // Return the offset to use for the GOT_INDX'th got entry which is |
| // for a local tls symbol specified by OBJECT, SYMNDX. |
| int64_t |
| do_tls_offset_for_local(const Relobj* object, |
| unsigned int symndx, |
| unsigned int got_indx) const; |
| |
| // Return the offset to use for the GOT_INDX'th got entry which is |
| // for global tls symbol GSYM. |
| int64_t |
| do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) 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, |
| Address 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*); |
| |
| // Emit relocations for a section. |
| 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, |
| off_t offset_in_output_section, |
| const Relocatable_relocs*, |
| unsigned char*, |
| Address view_address, |
| section_size_type, |
| unsigned char* reloc_view, |
| section_size_type reloc_view_size); |
| |
| // Return whether SYM is defined by the ABI. |
| bool |
| do_is_defined_by_abi(const Symbol* sym) const |
| { |
| return strcmp(sym->name(), "__tls_get_addr") == 0; |
| } |
| |
| // Return the size of the GOT section. |
| section_size_type |
| got_size() const |
| { |
| gold_assert(this->got_ != NULL); |
| return this->got_->data_size(); |
| } |
| |
| // Get the PLT section. |
| const Output_data_plt_powerpc<size, big_endian>* |
| plt_section() const |
| { |
| gold_assert(this->plt_ != NULL); |
| return this->plt_; |
| } |
| |
| // Get the IPLT section. |
| const Output_data_plt_powerpc<size, big_endian>* |
| iplt_section() const |
| { |
| gold_assert(this->iplt_ != NULL); |
| return this->iplt_; |
| } |
| |
| // Get the .glink section. |
| const Output_data_glink<size, big_endian>* |
| glink_section() const |
| { |
| gold_assert(this->glink_ != NULL); |
| return this->glink_; |
| } |
| |
| // Get the GOT section. |
| const Output_data_got_powerpc<size, big_endian>* |
| got_section() const |
| { |
| gold_assert(this->got_ != NULL); |
| return this->got_; |
| } |
| |
| Object* |
| do_make_elf_object(const std::string&, Input_file*, off_t, |
| const elfcpp::Ehdr<size, big_endian>&); |
| |
| // Return the number of entries in the GOT. |
| unsigned int |
| got_entry_count() const |
| { |
| if (this->got_ == NULL) |
| return 0; |
| return this->got_size() / (size / 8); |
| } |
| |
| // 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; |
| |
| // Add any special sections for this symbol to the gc work list. |
| // For powerpc64, this adds the code section of a function |
| // descriptor. |
| void |
| do_gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const; |
| |
| // Handle target specific gc actions when adding a gc reference from |
| // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX |
| // and DST_OFF. For powerpc64, this adds a referenc to the code |
| // section of a function descriptor. |
| void |
| do_gc_add_reference(Symbol_table* symtab, |
| Object* src_obj, |
| unsigned int src_shndx, |
| Object* dst_obj, |
| unsigned int dst_shndx, |
| Address dst_off) const; |
| |
| private: |
| |
| // The class which scans relocations. |
| class Scan |
| { |
| public: |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| |
| Scan() |
| : issued_non_pic_error_(false) |
| { } |
| |
| static inline int |
| get_reference_flags(unsigned int r_type); |
| |
| inline void |
| local(Symbol_table* symtab, Layout* layout, Target_powerpc* 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_powerpc* 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_powerpc* , |
| Sized_relobj_file<size, big_endian>* , |
| unsigned int , |
| Output_section* , |
| const elfcpp::Rela<size, big_endian>& , |
| unsigned int , |
| const elfcpp::Sym<size, big_endian>&) |
| { return false; } |
| |
| inline bool |
| global_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| Target_powerpc* , |
| Sized_relobj_file<size, big_endian>* , |
| unsigned int , |
| Output_section* , |
| const elfcpp::Rela<size, |
| big_endian>& , |
| unsigned int , Symbol*) |
| { return false; } |
| |
| 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*); |
| |
| static void |
| generate_tls_call(Symbol_table* symtab, Layout* layout, |
| Target_powerpc* target); |
| |
| void |
| check_non_pic(Relobj*, unsigned int r_type); |
| |
| bool |
| reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>* object, |
| unsigned int r_type); |
| |
| // Whether we have issued an error about a non-PIC compilation. |
| bool issued_non_pic_error_; |
| }; |
| |
| Address |
| symval_for_branch(Address value, const Sized_symbol<size>* gsym, |
| Powerpc_relobj<size, big_endian>* object, |
| unsigned int *dest_shndx); |
| |
| // The class which implements relocation. |
| class Relocate |
| { |
| public: |
| // Use 'at' branch hints when true, 'y' when false. |
| // FIXME maybe: set this with an option. |
| static const bool is_isa_v2 = true; |
| |
| enum skip_tls |
| { |
| CALL_NOT_EXPECTED = 0, |
| CALL_EXPECTED = 1, |
| CALL_SKIP = 2 |
| }; |
| |
| Relocate() |
| : call_tls_get_addr_(CALL_NOT_EXPECTED) |
| { } |
| |
| ~Relocate() |
| { |
| if (this->call_tls_get_addr_ != CALL_NOT_EXPECTED) |
| { |
| // FIXME: This needs to specify the location somehow. |
| gold_error(_("missing expected __tls_get_addr call")); |
| } |
| } |
| |
| // 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_powerpc*, |
| 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); |
| |
| // This is set if we should skip the next reloc, which should be a |
| // call to __tls_get_addr. |
| enum skip_tls call_tls_get_addr_; |
| }; |
| |
| // 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*) |
| { |
| gold_unreachable(); |
| return 0; |
| } |
| }; |
| |
| // 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. |
| |
| tls::Tls_optimization |
| optimize_tls_gd(bool is_final) |
| { |
| // If we are generating a shared library, then we can't do anything |
| // in the linker. |
| if (parameters->options().shared()) |
| return tls::TLSOPT_NONE; |
| |
| if (!is_final) |
| return tls::TLSOPT_TO_IE; |
| return tls::TLSOPT_TO_LE; |
| } |
| |
| tls::Tls_optimization |
| optimize_tls_ld() |
| { |
| if (parameters->options().shared()) |
| return tls::TLSOPT_NONE; |
| |
| return tls::TLSOPT_TO_LE; |
| } |
| |
| tls::Tls_optimization |
| optimize_tls_ie(bool is_final) |
| { |
| if (!is_final || parameters->options().shared()) |
| return tls::TLSOPT_NONE; |
| |
| return tls::TLSOPT_TO_LE; |
| } |
| |
| // Get the GOT section, creating it if necessary. |
| Output_data_got_powerpc<size, big_endian>* |
| got_section(Symbol_table*, Layout*); |
| |
| // Create glink. |
| void |
| make_glink_section(Layout*); |
| |
| // Create the PLT section. |
| void |
| make_plt_section(Layout*); |
| |
| void |
| make_iplt_section(Layout*); |
| |
| // Create a PLT entry for a global symbol. |
| void |
| make_plt_entry(Layout*, Symbol*, |
| const elfcpp::Rela<size, big_endian>&, |
| const Sized_relobj_file<size, big_endian>* object); |
| |
| // Create a PLT entry for a local IFUNC symbol. |
| void |
| make_local_ifunc_plt_entry(Layout*, |
| const elfcpp::Rela<size, big_endian>&, |
| Sized_relobj_file<size, big_endian>*); |
| |
| // Create a GOT entry for local dynamic __tls_get_addr. |
| unsigned int |
| tlsld_got_offset(Symbol_table* symtab, Layout* layout, |
| Sized_relobj_file<size, big_endian>* object); |
| |
| unsigned int |
| tlsld_got_offset() const |
| { |
| return this->tlsld_got_offset_; |
| } |
| |
| // Get the dynamic reloc section, creating it if necessary. |
| Reloc_section* |
| rela_dyn_section(Layout*); |
| |
| // Copy a relocation against a global symbol. |
| 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 Target::Target_info powerpc_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, |
| GOT_TYPE_TLSGD, // double entry for @got@tlsgd |
| GOT_TYPE_DTPREL, // entry for @got@dtprel |
| GOT_TYPE_TPREL // entry for @got@tprel |
| }; |
| |
| // The GOT output section. |
| Output_data_got_powerpc<size, big_endian>* got_; |
| // The PLT output section. |
| Output_data_plt_powerpc<size, big_endian>* plt_; |
| // The IPLT output section. |
| Output_data_plt_powerpc<size, big_endian>* iplt_; |
| // The .glink output section. |
| Output_data_glink<size, big_endian>* glink_; |
| // The dynamic reloc output section. |
| Reloc_section* rela_dyn_; |
| // Relocs saved to avoid a COPY reloc. |
| Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; |
| // Space for variables copied with a COPY reloc. |
| Output_data_space* dynbss_; |
| // Offset of the GOT entry for local dynamic __tls_get_addr calls. |
| unsigned int tlsld_got_offset_; |
| }; |
| |
| template<> |
| Target::Target_info Target_powerpc<32, true>::powerpc_info = |
| { |
| 32, // size |
| true, // is_big_endian |
| elfcpp::EM_PPC, // 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 |
| "/usr/lib/ld.so.1", // dynamic_linker |
| 0x10000000, // default_text_segment_address |
| 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 4 * 1024, // 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 |
| }; |
| |
| template<> |
| Target::Target_info Target_powerpc<32, false>::powerpc_info = |
| { |
| 32, // size |
| false, // is_big_endian |
| elfcpp::EM_PPC, // 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 |
| "/usr/lib/ld.so.1", // dynamic_linker |
| 0x10000000, // default_text_segment_address |
| 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 4 * 1024, // 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 |
| }; |
| |
| template<> |
| Target::Target_info Target_powerpc<64, true>::powerpc_info = |
| { |
| 64, // size |
| true, // is_big_endian |
| elfcpp::EM_PPC64, // 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 |
| "/usr/lib/ld.so.1", // dynamic_linker |
| 0x10000000, // default_text_segment_address |
| 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 4 * 1024, // 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 |
| }; |
| |
| template<> |
| Target::Target_info Target_powerpc<64, false>::powerpc_info = |
| { |
| 64, // size |
| false, // is_big_endian |
| elfcpp::EM_PPC64, // 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 |
| "/usr/lib/ld.so.1", // dynamic_linker |
| 0x10000000, // default_text_segment_address |
| 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 4 * 1024, // 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 |
| }; |
| |
| inline bool |
| is_branch_reloc(unsigned int r_type) |
| { |
| return (r_type == elfcpp::R_POWERPC_REL24 |
| || r_type == elfcpp::R_PPC_PLTREL24 |
| || r_type == elfcpp::R_PPC_LOCAL24PC |
| || r_type == elfcpp::R_POWERPC_REL14 |
| || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN |
| || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN |
| || r_type == elfcpp::R_POWERPC_ADDR24 |
| || r_type == elfcpp::R_POWERPC_ADDR14 |
| || r_type == elfcpp::R_POWERPC_ADDR14_BRTAKEN |
| || r_type == elfcpp::R_POWERPC_ADDR14_BRNTAKEN); |
| } |
| |
| // If INSN is an opcode that may be used with an @tls operand, return |
| // the transformed insn for TLS optimisation, otherwise return 0. If |
| // REG is non-zero only match an insn with RB or RA equal to REG. |
| uint32_t |
| at_tls_transform(uint32_t insn, unsigned int reg) |
| { |
| if ((insn & (0x3f << 26)) != 31 << 26) |
| return 0; |
| |
| unsigned int rtra; |
| if (reg == 0 || ((insn >> 11) & 0x1f) == reg) |
| rtra = insn & ((1 << 26) - (1 << 16)); |
| else if (((insn >> 16) & 0x1f) == reg) |
| rtra = (insn & (0x1f << 21)) | ((insn & (0x1f << 11)) << 5); |
| else |
| return 0; |
| |
| if ((insn & (0x3ff << 1)) == 266 << 1) |
| // add -> addi |
| insn = 14 << 26; |
| else if ((insn & (0x1f << 1)) == 23 << 1 |
| && ((insn & (0x1f << 6)) < 14 << 6 |
| || ((insn & (0x1f << 6)) >= 16 << 6 |
| && (insn & (0x1f << 6)) < 24 << 6))) |
| // load and store indexed -> dform |
| insn = (32 | ((insn >> 6) & 0x1f)) << 26; |
| else if ((insn & (((0x1a << 5) | 0x1f) << 1)) == 21 << 1) |
| // ldx, ldux, stdx, stdux -> ld, ldu, std, stdu |
| insn = ((58 | ((insn >> 6) & 4)) << 26) | ((insn >> 6) & 1); |
| else if ((insn & (((0x1f << 5) | 0x1f) << 1)) == 341 << 1) |
| // lwax -> lwa |
| insn = (58 << 26) | 2; |
| else |
| return 0; |
| insn |= rtra; |
| return insn; |
| } |
| |
| // Modified version of symtab.h class Symbol member |
| // Given a direct absolute or pc-relative static relocation against |
| // the global symbol, this function returns whether a dynamic relocation |
| // is needed. |
| |
| template<int size> |
| bool |
| needs_dynamic_reloc(const Symbol* gsym, int flags) |
| { |
| // No dynamic relocations in a static link! |
| if (parameters->doing_static_link()) |
| return false; |
| |
| // A reference to an undefined symbol from an executable should be |
| // statically resolved to 0, and does not need a dynamic relocation. |
| // This matches gnu ld behavior. |
| if (gsym->is_undefined() && !parameters->options().shared()) |
| return false; |
| |
| // A reference to an absolute symbol does not need a dynamic relocation. |
| if (gsym->is_absolute()) |
| return false; |
| |
| // An absolute reference within a position-independent output file |
| // will need a dynamic relocation. |
| if ((flags & Symbol::ABSOLUTE_REF) |
| && parameters->options().output_is_position_independent()) |
| return true; |
| |
| // A function call that can branch to a local PLT entry does not need |
| // a dynamic relocation. |
| if ((flags & Symbol::FUNCTION_CALL) && gsym->has_plt_offset()) |
| return false; |
| |
| // A reference to any PLT entry in a non-position-independent executable |
| // does not need a dynamic relocation. |
| // Except due to having function descriptors on powerpc64 we don't define |
| // functions to their plt code in an executable, so this doesn't apply. |
| if (size == 32 |
| && !parameters->options().output_is_position_independent() |
| && gsym->has_plt_offset()) |
| return false; |
| |
| // A reference to a symbol defined in a dynamic object or to a |
| // symbol that is preemptible will need a dynamic relocation. |
| if (gsym->is_from_dynobj() |
| || gsym->is_undefined() |
| || gsym->is_preemptible()) |
| return true; |
| |
| // For all other cases, return FALSE. |
| return false; |
| } |
| |
| // Modified version of symtab.h class Symbol member |
| // Whether we should use the PLT offset associated with a symbol for |
| // a relocation. FLAGS is a set of Reference_flags. |
| |
| template<int size> |
| bool |
| use_plt_offset(const Symbol* gsym, int flags) |
| { |
| // If the symbol doesn't have a PLT offset, then naturally we |
| // don't want to use it. |
| if (!gsym->has_plt_offset()) |
| return false; |
| |
| // For a STT_GNU_IFUNC symbol we always have to use the PLT entry. |
| if (gsym->type() == elfcpp::STT_GNU_IFUNC) |
| return true; |
| |
| // If we are going to generate a dynamic relocation, then we will |
| // wind up using that, so no need to use the PLT entry. |
| if (needs_dynamic_reloc<size>(gsym, flags)) |
| return false; |
| |
| // If the symbol is from a dynamic object, we need to use the PLT |
| // entry. |
| if (gsym->is_from_dynobj()) |
| return true; |
| |
| // If we are generating a shared object, and gsym symbol is |
| // undefined or preemptible, we need to use the PLT entry. |
| if (parameters->options().shared() |
| && (gsym->is_undefined() || gsym->is_preemptible())) |
| return true; |
| |
| // If gsym is a call to a weak undefined symbol, we need to use |
| // the PLT entry; the symbol may be defined by a library loaded |
| // at runtime. |
| if ((flags & Symbol::FUNCTION_CALL) && gsym->is_weak_undefined()) |
| return true; |
| |
| // Otherwise we can use the regular definition. |
| return false; |
| } |
| |
| template<int size, bool big_endian> |
| class Powerpc_relocate_functions |
| { |
| public: |
| enum Overflow_check |
| { |
| CHECK_NONE, |
| CHECK_SIGNED, |
| CHECK_BITFIELD |
| }; |
| |
| enum Status |
| { |
| STATUS_OK, |
| STATUS_OVERFLOW |
| }; |
| |
| private: |
| typedef Powerpc_relocate_functions<size, big_endian> This; |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| |
| template<int valsize> |
| static inline bool |
| has_overflow_signed(Address value) |
| { |
| // limit = 1 << (valsize - 1) without shift count exceeding size of type |
| Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); |
| limit <<= ((valsize - 1) >> 1); |
| limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); |
| return value + limit > (limit << 1) - 1; |
| } |
| |
| template<int valsize> |
| static inline bool |
| has_overflow_bitfield(Address value) |
| { |
| Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); |
| limit <<= ((valsize - 1) >> 1); |
| limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); |
| return value > (limit << 1) - 1 && value + limit > (limit << 1) - 1; |
| } |
| |
| template<int valsize> |
| static inline Status |
| overflowed(Address value, Overflow_check overflow) |
| { |
| if (overflow == CHECK_SIGNED) |
| { |
| if (has_overflow_signed<valsize>(value)) |
| return STATUS_OVERFLOW; |
| } |
| else if (overflow == CHECK_BITFIELD) |
| { |
| if (has_overflow_bitfield<valsize>(value)) |
| return STATUS_OVERFLOW; |
| } |
| return STATUS_OK; |
| } |
| |
| // Do a simple RELA relocation |
| template<int valsize> |
| static inline Status |
| rela(unsigned char* view, Address value, Overflow_check overflow) |
| { |
| typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| Valtype* wv = reinterpret_cast<Valtype*>(view); |
| elfcpp::Swap<valsize, big_endian>::writeval(wv, value); |
| return overflowed<valsize>(value, overflow); |
| } |
| |
| template<int valsize> |
| static inline Status |
| rela(unsigned char* view, |
| unsigned int right_shift, |
| typename elfcpp::Valtype_base<valsize>::Valtype dst_mask, |
| Address value, |
| Overflow_check overflow) |
| { |
| typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| Valtype* wv = reinterpret_cast<Valtype*>(view); |
| Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| Valtype reloc = value >> right_shift; |
| val &= ~dst_mask; |
| reloc &= dst_mask; |
| elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); |
| return overflowed<valsize>(value >> right_shift, overflow); |
| } |
| |
| // Do a simple RELA relocation, unaligned. |
| template<int valsize> |
| static inline Status |
| rela_ua(unsigned char* view, Address value, Overflow_check overflow) |
| { |
| elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, value); |
| return overflowed<valsize>(value, overflow); |
| } |
| |
| template<int valsize> |
| static inline Status |
| rela_ua(unsigned char* view, |
| unsigned int right_shift, |
| typename elfcpp::Valtype_base<valsize>::Valtype dst_mask, |
| Address value, |
| Overflow_check overflow) |
| { |
| typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| Valtype; |
| Valtype val = elfcpp::Swap<valsize, big_endian>::readval(view); |
| Valtype reloc = value >> right_shift; |
| val &= ~dst_mask; |
| reloc &= dst_mask; |
| elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, val | reloc); |
| return overflowed<valsize>(value >> right_shift, overflow); |
| } |
| |
| public: |
| // R_PPC64_ADDR64: (Symbol + Addend) |
| static inline void |
| addr64(unsigned char* view, Address value) |
| { This::template rela<64>(view, value, CHECK_NONE); } |
| |
| // R_PPC64_UADDR64: (Symbol + Addend) unaligned |
| static inline void |
| addr64_u(unsigned char* view, Address value) |
| { This::template rela_ua<64>(view, value, CHECK_NONE); } |
| |
| // R_POWERPC_ADDR32: (Symbol + Addend) |
| static inline Status |
| addr32(unsigned char* view, Address value, Overflow_check overflow) |
| { return This::template rela<32>(view, value, overflow); } |
| |
| // R_POWERPC_UADDR32: (Symbol + Addend) unaligned |
| static inline Status |
| addr32_u(unsigned char* view, Address value, Overflow_check overflow) |
| { return This::template rela_ua<32>(view, value, overflow); } |
| |
| // R_POWERPC_ADDR24: (Symbol + Addend) & 0x3fffffc |
| static inline Status |
| addr24(unsigned char* view, Address value, Overflow_check overflow) |
| { |
| Status stat = This::template rela<32>(view, 0, 0x03fffffc, value, overflow); |
| if (overflow != CHECK_NONE && (value & 3) != 0) |
| stat = STATUS_OVERFLOW; |
| return stat; |
| } |
| |
| // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff |
| static inline Status |
| addr16(unsigned char* view, Address value, Overflow_check overflow) |
| { return This::template rela<16>(view, value, overflow); } |
| |
| // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff, unaligned |
| static inline Status |
| addr16_u(unsigned char* view, Address value, Overflow_check overflow) |
| { return This::template rela_ua<16>(view, value, overflow); } |
| |
| // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc |
| static inline Status |
| addr16_ds(unsigned char* view, Address value, Overflow_check overflow) |
| { |
| Status stat = This::template rela<16>(view, 0, 0xfffc, value, overflow); |
| if (overflow != CHECK_NONE && (value & 3) != 0) |
| stat = STATUS_OVERFLOW; |
| return stat; |
| } |
| |
| // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff |
| static inline void |
| addr16_hi(unsigned char* view, Address value) |
| { This::template rela<16>(view, 16, 0xffff, value, CHECK_NONE); } |
| |
| // R_POWERPC_ADDR16_HA: ((Symbol + Addend + 0x8000) >> 16) & 0xffff |
| static inline void |
| addr16_ha(unsigned char* view, Address value) |
| { This::addr16_hi(view, value + 0x8000); } |
| |
| // R_POWERPC_ADDR16_HIGHER: ((Symbol + Addend) >> 32) & 0xffff |
| static inline void |
| addr16_hi2(unsigned char* view, Address value) |
| { This::template rela<16>(view, 32, 0xffff, value, CHECK_NONE); } |
| |
| // R_POWERPC_ADDR16_HIGHERA: ((Symbol + Addend + 0x8000) >> 32) & 0xffff |
| static inline void |
| addr16_ha2(unsigned char* view, Address value) |
| { This::addr16_hi2(view, value + 0x8000); } |
| |
| // R_POWERPC_ADDR16_HIGHEST: ((Symbol + Addend) >> 48) & 0xffff |
| static inline void |
| addr16_hi3(unsigned char* view, Address value) |
| { This::template rela<16>(view, 48, 0xffff, value, CHECK_NONE); } |
| |
| // R_POWERPC_ADDR16_HIGHESTA: ((Symbol + Addend + 0x8000) >> 48) & 0xffff |
| static inline void |
| addr16_ha3(unsigned char* view, Address value) |
| { This::addr16_hi3(view, value + 0x8000); } |
| |
| // R_POWERPC_ADDR14: (Symbol + Addend) & 0xfffc |
| static inline Status |
| addr14(unsigned char* view, Address value, Overflow_check overflow) |
| { |
| Status stat = This::template rela<32>(view, 0, 0xfffc, value, overflow); |
| if (overflow != CHECK_NONE && (value & 3) != 0) |
| stat = STATUS_OVERFLOW; |
| return stat; |
| } |
| }; |
| |
| // Stash away the index of .got2 or .opd in a relocatable object, if |
| // such a section exists. |
| |
| template<int size, bool big_endian> |
| bool |
| Powerpc_relobj<size, big_endian>::do_find_special_sections( |
| Read_symbols_data* sd) |
| { |
| const unsigned char* const pshdrs = sd->section_headers->data(); |
| const unsigned char* namesu = sd->section_names->data(); |
| const char* names = reinterpret_cast<const char*>(namesu); |
| section_size_type names_size = sd->section_names_size; |
| const unsigned char* s; |
| |
| s = this->find_shdr(pshdrs, size == 32 ? ".got2" : ".opd", |
| names, names_size, NULL); |
| if (s != NULL) |
| { |
| unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size; |
| this->special_ = ndx; |
| } |
| return Sized_relobj_file<size, big_endian>::do_find_special_sections(sd); |
| } |
| |
| // Examine .rela.opd to build info about function entry points. |
| |
| template<int size, bool big_endian> |
| void |
| Powerpc_relobj<size, big_endian>::scan_opd_relocs( |
| size_t reloc_count, |
| const unsigned char* prelocs, |
| const unsigned char* plocal_syms) |
| { |
| if (size == 64) |
| { |
| typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc |
| Reltype; |
| const int reloc_size |
| = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; |
| const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| Address expected_off = 0; |
| bool regular = true; |
| unsigned int opd_ent_size = 0; |
| |
| for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
| { |
| Reltype reloc(prelocs); |
| typename elfcpp::Elf_types<size>::Elf_WXword r_info |
| = reloc.get_r_info(); |
| unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| if (r_type == elfcpp::R_PPC64_ADDR64) |
| { |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| typename elfcpp::Elf_types<size>::Elf_Addr value; |
| bool is_ordinary; |
| unsigned int shndx; |
| if (r_sym < this->local_symbol_count()) |
| { |
| typename elfcpp::Sym<size, big_endian> |
| lsym(plocal_syms + r_sym * sym_size); |
| shndx = lsym.get_st_shndx(); |
| shndx = this->adjust_sym_shndx(r_sym, shndx, &is_ordinary); |
| value = lsym.get_st_value(); |
| } |
| else |
| shndx = this->symbol_section_and_value(r_sym, &value, |
| &is_ordinary); |
| this->set_opd_ent(reloc.get_r_offset(), shndx, |
| value + reloc.get_r_addend()); |
| if (i == 2) |
| { |
| expected_off = reloc.get_r_offset(); |
| opd_ent_size = expected_off; |
| } |
| else if (expected_off != reloc.get_r_offset()) |
| regular = false; |
| expected_off += opd_ent_size; |
| } |
| else if (r_type == elfcpp::R_PPC64_TOC) |
| { |
| if (expected_off - opd_ent_size + 8 != reloc.get_r_offset()) |
| regular = false; |
| } |
| else |
| { |
| gold_warning(_("%s: unexpected reloc type %u in .opd section"), |
| this->name().c_str(), r_type); |
| regular = false; |
| } |
| } |
| if (reloc_count <= 2) |
| opd_ent_size = this->section_size(this->opd_shndx()); |
| if (opd_ent_size != 24 && opd_ent_size != 16) |
| regular = false; |
| if (!regular) |
| { |
| gold_warning(_("%s: .opd is not a regular array of opd entries"), |
| this->name().c_str()); |
| opd_ent_size = 0; |
| } |
| } |
| } |
| |
| template<int size, bool big_endian> |
| void |
| Powerpc_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd) |
| { |
| Sized_relobj_file<size, big_endian>::do_read_relocs(rd); |
| if (size == 64) |
| { |
| for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); |
| p != rd->relocs.end(); |
| ++p) |
| { |
| if (p->data_shndx == this->opd_shndx()) |
| { |
| uint64_t opd_size = this->section_size(this->opd_shndx()); |
| gold_assert(opd_size == static_cast<size_t>(opd_size)); |
| if (opd_size != 0) |
| { |
| this->init_opd(opd_size); |
| this->scan_opd_relocs(p->reloc_count, p->contents->data(), |
| rd->local_symbols->data()); |
| } |
| break; |
| } |
| } |
| } |
| } |
| |
| // Set up PowerPC target specific relobj. |
| |
| template<int size, bool big_endian> |
| Object* |
| Target_powerpc<size, big_endian>::do_make_elf_object( |
| const std::string& name, |
| Input_file* input_file, |
| off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) |
| { |
| int et = ehdr.get_e_type(); |
| // ET_EXEC files are valid input for --just-symbols/-R, |
| // and we treat them as relocatable objects. |
| if (et == elfcpp::ET_REL |
| || (et == elfcpp::ET_EXEC && input_file->just_symbols())) |
| { |
| Powerpc_relobj<size, big_endian>* obj = |
| new Powerpc_relobj<size, big_endian>(name, input_file, offset, ehdr); |
| obj->setup(); |
| return obj; |
| } |
| else if (et == elfcpp::ET_DYN) |
| { |
| Sized_dynobj<size, big_endian>* obj = |
| new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); |
| obj->setup(); |
| return obj; |
| } |
| else |
| { |
| gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et); |
| return NULL; |
| } |
| } |
| |
| template<int size, bool big_endian> |
| class Output_data_got_powerpc : public Output_data_got<size, big_endian> |
| { |
| public: |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; |
| typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn; |
| |
| Output_data_got_powerpc(Symbol_table* symtab, Layout* layout) |
| : Output_data_got<size, big_endian>(), |
| symtab_(symtab), layout_(layout), |
| header_ent_cnt_(size == 32 ? 3 : 1), |
| header_index_(size == 32 ? 0x2000 : 0) |
| {} |
| |
| class Got_entry; |
| |
| // Create a new GOT entry and return its offset. |
| unsigned int |
| add_got_entry(Got_entry got_entry) |
| { |
| this->reserve_ent(); |
| return Output_data_got<size, big_endian>::add_got_entry(got_entry); |
| } |
| |
| // Create a pair of new GOT entries and return the offset of the first. |
| unsigned int |
| add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2) |
| { |
| this->reserve_ent(2); |
| return Output_data_got<size, big_endian>::add_got_entry_pair(got_entry_1, |
| got_entry_2); |
| } |
| |
| unsigned int |
| add_constant_pair(Valtype c1, Valtype c2) |
| { |
| this->reserve_ent(2); |
| unsigned int got_offset = this->add_constant(c1); |
| this->add_constant(c2); |
| return got_offset; |
| } |
| |
| // Offset of _GLOBAL_OFFSET_TABLE_. |
| unsigned int |
| g_o_t() const |
| { |
| return this->got_offset(this->header_index_); |
| } |
| |
| // Offset of base used to access the GOT/TOC. |
| // The got/toc pointer reg will be set to this value. |
| typename elfcpp::Elf_types<size>::Elf_Off |
| got_base_offset(const Powerpc_relobj<size, big_endian>* object) const |
| { |
| if (size == 32) |
| return this->g_o_t(); |
| else |
| return (this->output_section()->address() |
| + object->toc_base_offset() |
| - this->address()); |
| } |
| |
| // Ensure our GOT has a header. |
| void |
| set_final_data_size() |
| { |
| if (this->header_ent_cnt_ != 0) |
| this->make_header(); |
| Output_data_got<size, big_endian>::set_final_data_size(); |
| } |
| |
| // First word of GOT header needs some values that are not |
| // handled by Output_data_got so poke them in here. |
| // For 32-bit, address of .dynamic, for 64-bit, address of TOCbase. |
| void |
| do_write(Output_file* of) |
| { |
| Valtype val = 0; |
| if (size == 32 && this->layout_->dynamic_data() != NULL) |
| val = this->layout_->dynamic_section()->address(); |
| if (size == 64) |
| val = this->output_section()->address() + 0x8000; |
| this->replace_constant(this->header_index_, val); |
| Output_data_got<size, big_endian>::do_write(of); |
| } |
| |
| private: |
| void |
| reserve_ent(unsigned int cnt = 1) |
| { |
| if (this->header_ent_cnt_ == 0) |
| return; |
| if (this->num_entries() + cnt > this->header_index_) |
| this->make_header(); |
| } |
| |
| void |
| make_header() |
| { |
| this->header_ent_cnt_ = 0; |
| this->header_index_ = this->num_entries(); |
| if (size == 32) |
| { |
| Output_data_got<size, big_endian>::add_constant(0); |
| Output_data_got<size, big_endian>::add_constant(0); |
| Output_data_got<size, big_endian>::add_constant(0); |
| |
| // Define _GLOBAL_OFFSET_TABLE_ at the header |
| this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| Symbol_table::PREDEFINED, |
| this, this->g_o_t(), 0, |
| elfcpp::STT_OBJECT, |
| elfcpp::STB_LOCAL, |
| elfcpp::STV_HIDDEN, |
| 0, false, false); |
| } |
| else |
| Output_data_got<size, big_endian>::add_constant(0); |
| } |
| |
| // Stashed pointers. |
| Symbol_table* symtab_; |
| Layout* layout_; |
| |
| // GOT header size. |
| unsigned int header_ent_cnt_; |
| // GOT header index. |
| unsigned int header_index_; |
| }; |
| |
| // Get the GOT section, creating it if necessary. |
| |
| template<int size, bool big_endian> |
| Output_data_got_powerpc<size, big_endian>* |
| Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab, |
| Layout* layout) |
| { |
| if (this->got_ == NULL) |
| { |
| gold_assert(symtab != NULL && layout != NULL); |
| |
| this->got_ |
| = new Output_data_got_powerpc<size, big_endian>(symtab, layout); |
| |
| layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| this->got_, ORDER_DATA, false); |
| } |
| |
| return this->got_; |
| } |
| |
| // Get the dynamic reloc section, creating it if necessary. |
| |
| template<int size, bool big_endian> |
| typename Target_powerpc<size, big_endian>::Reloc_section* |
| Target_powerpc<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_; |
| } |
| |
| // A class to handle the PLT data. |
| |
| template<int size, bool big_endian> |
| class Output_data_plt_powerpc : public Output_section_data_build |
| { |
| public: |
| typedef Output_data_reloc<elfcpp::SHT_RELA, true, |
| size, big_endian> Reloc_section; |
| |
| Output_data_plt_powerpc(Target_powerpc<size, big_endian>* targ, |
| Reloc_section* plt_rel, |
| unsigned int reserved_size, |
| const char* name) |
| : Output_section_data_build(size == 32 ? 4 : 8), |
| rel_(plt_rel), |
| targ_(targ), |
| initial_plt_entry_size_(reserved_size), |
| name_(name) |
| { } |
| |
| // Add an entry to the PLT. |
| void |
| add_entry(Symbol*); |
| |
| void |
| add_ifunc_entry(Symbol*); |
| |
| void |
| add_local_ifunc_entry(Sized_relobj_file<size, big_endian>*, unsigned int); |
| |
| // Return the .rela.plt section data. |
| Reloc_section* |
| rel_plt() const |
| { |
| return this->rel_; |
| } |
| |
| // Return the number of PLT entries. |
| unsigned int |
| entry_count() const |
| { |
| return ((this->current_data_size() - this->initial_plt_entry_size_) |
| / plt_entry_size); |
| } |
| |
| // Return the offset of the first non-reserved PLT entry. |
| unsigned int |
| first_plt_entry_offset() |
| { return this->initial_plt_entry_size_; } |
| |
| // Return the size of a PLT entry. |
| static unsigned int |
| get_plt_entry_size() |
| { return plt_entry_size; } |
| |
| protected: |
| void |
| do_adjust_output_section(Output_section* os) |
| { |
| os->set_entsize(0); |
| } |
| |
| // Write to a map file. |
| void |
| do_print_to_mapfile(Mapfile* mapfile) const |
| { mapfile->print_output_data(this, this->name_); } |
| |
| private: |
| // The size of an entry in the PLT. |
| static const int plt_entry_size = size == 32 ? 4 : 24; |
| |
| // Write out the PLT data. |
| void |
| do_write(Output_file*); |
| |
| // The reloc section. |
| Reloc_section* rel_; |
| // Allows access to .glink for do_write. |
| Target_powerpc<size, big_endian>* targ_; |
| // The size of the first reserved entry. |
| int initial_plt_entry_size_; |
| // What to report in map file. |
| const char *name_; |
| }; |
| |
| // Add an entry to the PLT. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym) |
| { |
| if (!gsym->has_plt_offset()) |
| { |
| off_t off = this->current_data_size(); |
| if (off == 0) |
| off += this->first_plt_entry_offset(); |
| gsym->set_plt_offset(off); |
| gsym->set_needs_dynsym_entry(); |
| unsigned int dynrel = elfcpp::R_POWERPC_JMP_SLOT; |
| this->rel_->add_global(gsym, dynrel, this, off, 0); |
| off += plt_entry_size; |
| this->set_current_data_size(off); |
| } |
| } |
| |
| // Add an entry for a global ifunc symbol that resolves locally, to the IPLT. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_powerpc<size, big_endian>::add_ifunc_entry(Symbol* gsym) |
| { |
| if (!gsym->has_plt_offset()) |
| { |
| off_t off = this->current_data_size(); |
| gsym->set_plt_offset(off); |
| unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| if (size == 64) |
| dynrel = elfcpp::R_PPC64_JMP_IREL; |
| this->rel_->add_symbolless_global_addend(gsym, dynrel, this, off, 0); |
| off += plt_entry_size; |
| this->set_current_data_size(off); |
| } |
| } |
| |
| // Add an entry for a local ifunc symbol to the IPLT. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_powerpc<size, big_endian>::add_local_ifunc_entry( |
| Sized_relobj_file<size, big_endian>* relobj, |
| unsigned int local_sym_index) |
| { |
| if (!relobj->local_has_plt_offset(local_sym_index)) |
| { |
| off_t off = this->current_data_size(); |
| relobj->set_local_plt_offset(local_sym_index, off); |
| unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| if (size == 64) |
| dynrel = elfcpp::R_PPC64_JMP_IREL; |
| this->rel_->add_symbolless_local_addend(relobj, local_sym_index, dynrel, |
| this, off, 0); |
| off += plt_entry_size; |
| this->set_current_data_size(off); |
| } |
| } |
| |
| static const uint32_t add_0_11_11 = 0x7c0b5a14; |
| static const uint32_t add_3_3_2 = 0x7c631214; |
| static const uint32_t add_3_3_13 = 0x7c636a14; |
| static const uint32_t add_11_0_11 = 0x7d605a14; |
| static const uint32_t add_12_2_11 = 0x7d825a14; |
| static const uint32_t addi_11_11 = 0x396b0000; |
| static const uint32_t addi_12_12 = 0x398c0000; |
| static const uint32_t addi_2_2 = 0x38420000; |
| static const uint32_t addi_3_2 = 0x38620000; |
| static const uint32_t addi_3_3 = 0x38630000; |
| static const uint32_t addis_0_2 = 0x3c020000; |
| static const uint32_t addis_0_13 = 0x3c0d0000; |
| static const uint32_t addis_11_11 = 0x3d6b0000; |
| static const uint32_t addis_11_30 = 0x3d7e0000; |
| static const uint32_t addis_12_12 = 0x3d8c0000; |
| static const uint32_t addis_12_2 = 0x3d820000; |
| static const uint32_t addis_3_2 = 0x3c620000; |
| static const uint32_t addis_3_13 = 0x3c6d0000; |
| static const uint32_t b = 0x48000000; |
| static const uint32_t bcl_20_31 = 0x429f0005; |
| static const uint32_t bctr = 0x4e800420; |
| static const uint32_t blrl = 0x4e800021; |
| static const uint32_t cror_15_15_15 = 0x4def7b82; |
| static const uint32_t cror_31_31_31 = 0x4ffffb82; |
| static const uint32_t ld_11_12 = 0xe96c0000; |
| static const uint32_t ld_11_2 = 0xe9620000; |
| static const uint32_t ld_2_1 = 0xe8410000; |
| static const uint32_t ld_2_11 = 0xe84b0000; |
| static const uint32_t ld_2_12 = 0xe84c0000; |
| static const uint32_t ld_2_2 = 0xe8420000; |
| static const uint32_t li_0_0 = 0x38000000; |
| static const uint32_t lis_0_0 = 0x3c000000; |
| static const uint32_t lis_11 = 0x3d600000; |
| static const uint32_t lis_12 = 0x3d800000; |
| static const uint32_t lwz_0_12 = 0x800c0000; |
| static const uint32_t lwz_11_11 = 0x816b0000; |
| static const uint32_t lwz_11_30 = 0x817e0000; |
| static const uint32_t lwz_12_12 = 0x818c0000; |
| static const uint32_t lwzu_0_12 = 0x840c0000; |
| static const uint32_t mflr_0 = 0x7c0802a6; |
| static const uint32_t mflr_11 = 0x7d6802a6; |
| static const uint32_t mflr_12 = 0x7d8802a6; |
| static const uint32_t mtctr_0 = 0x7c0903a6; |
| static const uint32_t mtctr_11 = 0x7d6903a6; |
| static const uint32_t mtlr_0 = 0x7c0803a6; |
| static const uint32_t mtlr_12 = 0x7d8803a6; |
| static const uint32_t nop = 0x60000000; |
| static const uint32_t ori_0_0_0 = 0x60000000; |
| static const uint32_t std_2_1 = 0xf8410000; |
| static const uint32_t sub_11_11_12 = 0x7d6c5850; |
| |
| // Write out the PLT. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of) |
| { |
| if (size == 32) |
| { |
| 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); |
| unsigned char* pov = oview; |
| unsigned char* endpov = oview + oview_size; |
| |
| // The address of the .glink branch table |
| const Output_data_glink<size, big_endian>* glink |
| = this->targ_->glink_section(); |
| elfcpp::Elf_types<32>::Elf_Addr branch_tab |
| = glink->address() + glink->pltresolve(); |
| |
| while (pov < endpov) |
| { |
| elfcpp::Swap<32, big_endian>::writeval(pov, branch_tab); |
| pov += 4; |
| branch_tab += 4; |
| } |
| |
| of->write_output_view(offset, oview_size, oview); |
| } |
| } |
| |
| // Create the PLT section. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::make_plt_section(Layout* layout) |
| { |
| if (this->plt_ == NULL) |
| { |
| if (this->glink_ == NULL) |
| make_glink_section(layout); |
| |
| // Ensure that .rela.dyn always appears before .rela.plt This is |
| // necessary due to how, on PowerPC and some other targets, .rela.dyn |
| // needs to include .rela.plt in it's range. |
| this->rela_dyn_section(layout); |
| |
| Reloc_section* plt_rel = new Reloc_section(false); |
| layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| elfcpp::SHF_ALLOC, plt_rel, |
| ORDER_DYNAMIC_PLT_RELOCS, false); |
| this->plt_ |
| = new Output_data_plt_powerpc<size, big_endian>(this, plt_rel, |
| size == 32 ? 0 : 24, |
| "** PLT"); |
| layout->add_output_section_data(".plt", |
| (size == 32 |
| ? elfcpp::SHT_PROGBITS |
| : elfcpp::SHT_NOBITS), |
| elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| this->plt_, |
| (size == 32 |
| ? ORDER_SMALL_DATA |
| : ORDER_SMALL_BSS), |
| false); |
| } |
| } |
| |
| // Create the IPLT section. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::make_iplt_section(Layout* layout) |
| { |
| if (this->iplt_ == NULL) |
| { |
| this->make_plt_section(layout); |
| |
| Reloc_section* iplt_rel = new Reloc_section(false); |
| this->rela_dyn_->output_section()->add_output_section_data(iplt_rel); |
| this->iplt_ |
| = new Output_data_plt_powerpc<size, big_endian>(this, iplt_rel, |
| 0, "** IPLT"); |
| this->plt_->output_section()->add_output_section_data(this->iplt_); |
| } |
| } |
| |
| // A class to handle .glink. |
| |
| template<int size, bool big_endian> |
| class Output_data_glink : public Output_section_data |
| { |
| public: |
| static const int pltresolve_size = 16*4; |
| |
| Output_data_glink(Target_powerpc<size, big_endian>*); |
| |
| // Add an entry |
| void |
| add_entry(const Sized_relobj_file<size, big_endian>*, |
| const Symbol*, |
| const elfcpp::Rela<size, big_endian>&); |
| |
| void |
| add_entry(const Sized_relobj_file<size, big_endian>*, |
| unsigned int, |
| const elfcpp::Rela<size, big_endian>&); |
| |
| unsigned int |
| find_entry(const Symbol*) const; |
| |
| unsigned int |
| find_entry(const Sized_relobj_file<size, big_endian>*, unsigned int) const; |
| |
| unsigned int |
| find_entry(const Sized_relobj_file<size, big_endian>*, |
| const Symbol*, |
| const elfcpp::Rela<size, big_endian>&) const; |
| |
| unsigned int |
| find_entry(const Sized_relobj_file<size, big_endian>*, |
| unsigned int, |
| const elfcpp::Rela<size, big_endian>&) const; |
| |
| unsigned int |
| glink_entry_size() const |
| { |
| if (size == 32) |
| return 4 * 4; |
| else |
| // FIXME: We should be using multiple glink sections for |
| // stubs to support > 33M applications. |
| return 8 * 4; |
| } |
| |
| off_t |
| pltresolve() const |
| { |
| return this->pltresolve_; |
| } |
| |
| protected: |
| // Write to a map file. |
| void |
| do_print_to_mapfile(Mapfile* mapfile) const |
| { mapfile->print_output_data(this, _("** glink")); } |
| |
| private: |
| void |
| set_final_data_size(); |
| |
| // Write out .glink |
| void |
| do_write(Output_file*); |
| |
| class Glink_sym_ent |
| { |
| public: |
| Glink_sym_ent(const Symbol* sym) |
| : sym_(sym), object_(0), addend_(0), locsym_(0) |
| { } |
| |
| Glink_sym_ent(const Sized_relobj_file<size, big_endian>* object, |
| unsigned int locsym_index) |
| : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) |
| { } |
| |
| Glink_sym_ent(const Sized_relobj_file<size, big_endian>* object, |
| const Symbol* sym, |
| const elfcpp::Rela<size, big_endian>& reloc) |
| : sym_(sym), object_(0), addend_(0), locsym_(0) |
| { |
| if (size != 32) |
| this->addend_ = reloc.get_r_addend(); |
| else if (parameters->options().output_is_position_independent() |
| && (elfcpp::elf_r_type<size>(reloc.get_r_info()) |
| == elfcpp::R_PPC_PLTREL24)) |
| { |
| this->addend_ = reloc.get_r_addend(); |
| if (this->addend_ >= 32768) |
| this->object_ = object; |
| } |
| } |
| |
| Glink_sym_ent(const Sized_relobj_file<size, big_endian>* object, |
| unsigned int locsym_index, |
| const elfcpp::Rela<size, big_endian>& reloc) |
| : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) |
| { |
| if (size != 32) |
| this->addend_ = reloc.get_r_addend(); |
| else if (parameters->options().output_is_position_independent() |
| && (elfcpp::elf_r_type<size>(reloc.get_r_info()) |
| == elfcpp::R_PPC_PLTREL24)) |
| this->addend_ = reloc.get_r_addend(); |
| } |
| |
| bool operator==(const Glink_sym_ent& that) const |
| { |
| return (this->sym_ == that.sym_ |
| && this->object_ == that.object_ |
| && this->addend_ == that.addend_ |
| && this->locsym_ == that.locsym_); |
| } |
| |
| const Symbol* sym_; |
| const Sized_relobj_file<size, big_endian>* object_; |
| typename elfcpp::Elf_types<size>::Elf_Addr addend_; |
| unsigned int locsym_; |
| }; |
| |
| class Glink_sym_ent_hash |
| { |
| public: |
| size_t operator()(const Glink_sym_ent& ent) const |
| { |
| return (reinterpret_cast<uintptr_t>(ent.sym_) |
| ^ reinterpret_cast<uintptr_t>(ent.object_) |
| ^ ent.addend_ |
| ^ ent.locsym_); |
| } |
| }; |
| |
| // Map sym/object/addend to index. |
| typedef Unordered_map<Glink_sym_ent, unsigned int, |
| Glink_sym_ent_hash> Glink_entries; |
| Glink_entries glink_entries_; |
| |
| // Offset of pltresolve stub (actually, branch table for 32-bit) |
| off_t pltresolve_; |
| |
| // Allows access to .got and .plt for do_write. |
| Target_powerpc<size, big_endian>* targ_; |
| }; |
| |
| // Create the glink section. |
| |
| template<int size, bool big_endian> |
| Output_data_glink<size, big_endian>::Output_data_glink( |
| Target_powerpc<size, big_endian>* targ) |
| : Output_section_data(16), |
| pltresolve_(0), targ_(targ) |
| { |
| } |
| |
| // Add an entry to glink, if we do not already have one for this |
| // sym/object/addend combo. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_glink<size, big_endian>::add_entry( |
| const Sized_relobj_file<size, big_endian>* object, |
| const Symbol* gsym, |
| const elfcpp::Rela<size, big_endian>& reloc) |
| { |
| Glink_sym_ent ent(object, gsym, reloc); |
| unsigned int indx = this->glink_entries_.size(); |
| this->glink_entries_.insert(std::make_pair(ent, indx)); |
| } |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_glink<size, big_endian>::add_entry( |
| const Sized_relobj_file<size, big_endian>* object, |
| unsigned int locsym_index, |
| const elfcpp::Rela<size, big_endian>& reloc) |
| { |
| Glink_sym_ent ent(object, locsym_index, reloc); |
| unsigned int indx = this->glink_entries_.size(); |
| this->glink_entries_.insert(std::make_pair(ent, indx)); |
| } |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Output_data_glink<size, big_endian>::find_entry( |
| const Sized_relobj_file<size, big_endian>* object, |
| const Symbol* gsym, |
| const elfcpp::Rela<size, big_endian>& reloc) const |
| { |
| Glink_sym_ent ent(object, gsym, reloc); |
| typename Glink_entries::const_iterator p = this->glink_entries_.find(ent); |
| gold_assert(p != this->glink_entries_.end()); |
| return p->second; |
| } |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Output_data_glink<size, big_endian>::find_entry(const Symbol* gsym) const |
| { |
| Glink_sym_ent ent(gsym); |
| typename Glink_entries::const_iterator p = this->glink_entries_.find(ent); |
| gold_assert(p != this->glink_entries_.end()); |
| return p->second; |
| } |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Output_data_glink<size, big_endian>::find_entry( |
| const Sized_relobj_file<size, big_endian>* object, |
| unsigned int locsym_index, |
| const elfcpp::Rela<size, big_endian>& reloc) const |
| { |
| Glink_sym_ent ent(object, locsym_index, reloc); |
| typename Glink_entries::const_iterator p = this->glink_entries_.find(ent); |
| gold_assert(p != this->glink_entries_.end()); |
| return p->second; |
| } |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Output_data_glink<size, big_endian>::find_entry( |
| const Sized_relobj_file<size, big_endian>* object, |
| unsigned int locsym_index) const |
| { |
| Glink_sym_ent ent(object, locsym_index); |
| typename Glink_entries::const_iterator p = this->glink_entries_.find(ent); |
| gold_assert(p != this->glink_entries_.end()); |
| return p->second; |
| } |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_glink<size, big_endian>::set_final_data_size() |
| { |
| unsigned int count = this->glink_entries_.size(); |
| off_t total = count; |
| |
| if (count != 0) |
| { |
| if (size == 32) |
| { |
| total *= 16; |
| this->pltresolve_ = total; |
| |
| // space for branch table |
| total += 4 * (count - 1); |
| |
| total += -total & 15; |
| total += this->pltresolve_size; |
| } |
| else |
| { |
| total *= 32; |
| this->pltresolve_ = total; |
| total += this->pltresolve_size; |
| |
| // space for branch table |
| total += 8 * count; |
| if (count > 0x8000) |
| total += 4 * (count - 0x8000); |
| } |
| } |
| |
| this->set_data_size(total); |
| } |
| |
| static inline uint32_t |
| l(uint32_t a) |
| { |
| return a & 0xffff; |
| } |
| |
| static inline uint32_t |
| hi(uint32_t a) |
| { |
| return l(a >> 16); |
| } |
| |
| static inline uint32_t |
| ha(uint32_t a) |
| { |
| return hi(a + 0x8000); |
| } |
| |
| template<bool big_endian> |
| static inline void |
| write_insn(unsigned char* p, uint32_t v) |
| { |
| elfcpp::Swap<32, big_endian>::writeval(p, v); |
| } |
| |
| // Write out .glink. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_glink<size, big_endian>::do_write(Output_file* of) |
| { |
| const off_t off = this->offset(); |
| const section_size_type oview_size = |
| convert_to_section_size_type(this->data_size()); |
| unsigned char* const oview = of->get_output_view(off, oview_size); |
| unsigned char* p; |
| |
| // The base address of the .plt section. |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| static const Address invalid_address = static_cast<Address>(0) - 1; |
| Address plt_base = this->targ_->plt_section()->address(); |
| Address iplt_base = invalid_address; |
| |
| const Output_data_got_powerpc<size, big_endian>* got |
| = this->targ_->got_section(); |
| |
| if (size == 64) |
| { |
| Address got_os_addr = got->output_section()->address(); |
| |
| // Write out call stubs. |
| typename Glink_entries::const_iterator g; |
| for (g = this->glink_entries_.begin(); |
| g != this->glink_entries_.end(); |
| ++g) |
| { |
| Address plt_addr; |
| bool is_ifunc; |
| const Symbol* gsym = g->first.sym_; |
| if (gsym != NULL) |
| { |
| is_ifunc = (gsym->type() == elfcpp::STT_GNU_IFUNC |
| && gsym->can_use_relative_reloc(false)); |
| plt_addr = gsym->plt_offset(); |
| } |
| else |
| { |
| is_ifunc = true; |
| const Sized_relobj_file<size, big_endian>* relobj |
| = g->first.object_; |
| unsigned int local_sym_index = g->first.locsym_; |
| plt_addr = relobj->local_plt_offset(local_sym_index); |
| } |
| if (is_ifunc) |
| { |
| if (iplt_base == invalid_address) |
| iplt_base = this->targ_->iplt_section()->address(); |
| plt_addr += iplt_base; |
| } |
| else |
| plt_addr += plt_base; |
| const Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| <const Powerpc_relobj<size, big_endian>*>(g->first.object_); |
| Address got_addr = got_os_addr + ppcobj->toc_base_offset(); |
| Address pltoff = plt_addr - got_addr; |
| |
| if (pltoff + 0x80008000 > 0xffffffff || (pltoff & 7) != 0) |
| gold_error(_("%s: linkage table error against `%s'"), |
| g->first.object_->name().c_str(), |
| g->first.sym_->demangled_name().c_str()); |
| |
| p = oview + g->second * this->glink_entry_size(); |
| if (ha(pltoff) != 0) |
| { |
| write_insn<big_endian>(p, addis_12_2 + ha(pltoff)), p += 4; |
| write_insn<big_endian>(p, std_2_1 + 40), p += 4; |
| write_insn<big_endian>(p, ld_11_12 + l(pltoff)), p += 4; |
| if (ha(pltoff + 16) != ha(pltoff)) |
| { |
| write_insn<big_endian>(p, addi_12_12 + l(pltoff)), p += 4; |
| pltoff = 0; |
| } |
| write_insn<big_endian>(p, mtctr_11), p += 4; |
| write_insn<big_endian>(p, ld_2_12 + l(pltoff + 8)), p += 4; |
| write_insn<big_endian>(p, ld_11_12 + l(pltoff + 16)), p += 4; |
| write_insn<big_endian>(p, bctr), p += 4; |
| } |
| else |
| { |
| write_insn<big_endian>(p, std_2_1 + 40), p += 4; |
| write_insn<big_endian>(p, ld_11_2 + l(pltoff)), p += 4; |
| if (ha(pltoff + 16) != ha(pltoff)) |
| { |
| write_insn<big_endian>(p, addi_2_2 + l(pltoff)), p += 4; |
| pltoff = 0; |
| } |
| write_insn<big_endian>(p, mtctr_11), p += 4; |
| write_insn<big_endian>(p, ld_11_2 + l(pltoff + 16)), p += 4; |
| write_insn<big_endian>(p, ld_2_2 + l(pltoff + 8)), p += 4; |
| write_insn<big_endian>(p, bctr), p += 4; |
| } |
| } |
| |
| // Write pltresolve stub. |
| p = oview + this->pltresolve_; |
| Address after_bcl = this->address() + this->pltresolve_ + 16; |
| Address pltoff = plt_base - after_bcl; |
| |
| elfcpp::Swap<64, big_endian>::writeval(p, pltoff), p += 8; |
| |
| write_insn<big_endian>(p, mflr_12), p += 4; |
| write_insn<big_endian>(p, bcl_20_31), p += 4; |
| write_insn<big_endian>(p, mflr_11), p += 4; |
| write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4; |
| write_insn<big_endian>(p, mtlr_12), p += 4; |
| write_insn<big_endian>(p, add_12_2_11), p += 4; |
| write_insn<big_endian>(p, ld_11_12 + 0), p += 4; |
| write_insn<big_endian>(p, ld_2_12 + 8), p += 4; |
| write_insn<big_endian>(p, mtctr_11), p += 4; |
| write_insn<big_endian>(p, ld_11_12 + 16), p += 4; |
| write_insn<big_endian>(p, bctr), p += 4; |
| while (p < oview + this->pltresolve_ + this->pltresolve_size) |
| write_insn<big_endian>(p, nop), p += 4; |
| |
| // Write lazy link call stubs. |
| uint32_t indx = 0; |
| while (p < oview + oview_size) |
| { |
| if (indx < 0x8000) |
| { |
| write_insn<big_endian>(p, li_0_0 + indx), p += 4; |
| } |
| else |
| { |
| write_insn<big_endian>(p, lis_0_0 + hi(indx)), p += 4; |
| write_insn<big_endian>(p, ori_0_0_0 + l(indx)), p += 4; |
| } |
| uint32_t branch_off = this->pltresolve_ + 8 - (p - oview); |
| write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4; |
| indx++; |
| } |
| } |
| else |
| { |
| // The address of _GLOBAL_OFFSET_TABLE_. |
| Address g_o_t = got->address() + got->g_o_t(); |
| |
| // Write out call stubs. |
| typename Glink_entries::const_iterator g; |
| for (g = this->glink_entries_.begin(); |
| g != this->glink_entries_.end(); |
| ++g) |
| { |
| Address plt_addr; |
| bool is_ifunc; |
| const Symbol* gsym = g->first.sym_; |
| if (gsym != NULL) |
| { |
| is_ifunc = (gsym->type() == elfcpp::STT_GNU_IFUNC |
| && gsym->can_use_relative_reloc(false)); |
| plt_addr = gsym->plt_offset(); |
| } |
| else |
| { |
| is_ifunc = true; |
| const Sized_relobj_file<size, big_endian>* relobj |
| = g->first.object_; |
| unsigned int local_sym_index = g->first.locsym_; |
| plt_addr = relobj->local_plt_offset(local_sym_index); |
| } |
| if (is_ifunc) |
| { |
| if (iplt_base == invalid_address) |
| iplt_base = this->targ_->iplt_section()->address(); |
| plt_addr += iplt_base; |
| } |
| else |
| plt_addr += plt_base; |
| |
| p = oview + g->second * this->glink_entry_size(); |
| if (parameters->options().output_is_position_independent()) |
| { |
| Address got_addr; |
| const Powerpc_relobj<size, big_endian>* object = static_cast |
| <const Powerpc_relobj<size, big_endian>*>(g->first.object_); |
| if (object != NULL && g->first.addend_ >= 32768) |
| { |
| unsigned int got2 = object->got2_shndx(); |
| got_addr = g->first.object_->get_output_section_offset(got2); |
| gold_assert(got_addr != invalid_address); |
| got_addr += (g->first.object_->output_section(got2)->address() |
| + g->first.addend_); |
| } |
| else |
| got_addr = g_o_t; |
| |
| Address pltoff = plt_addr - got_addr; |
| if (ha(pltoff) == 0) |
| { |
| write_insn<big_endian>(p + 0, lwz_11_30 + l(pltoff)); |
| write_insn<big_endian>(p + 4, mtctr_11); |
| write_insn<big_endian>(p + 8, bctr); |
| } |
| else |
| { |
| write_insn<big_endian>(p + 0, addis_11_30 + ha(pltoff)); |
| write_insn<big_endian>(p + 4, lwz_11_11 + l(pltoff)); |
| write_insn<big_endian>(p + 8, mtctr_11); |
| write_insn<big_endian>(p + 12, bctr); |
| } |
| } |
| else |
| { |
| write_insn<big_endian>(p + 0, lis_11 + ha(plt_addr)); |
| write_insn<big_endian>(p + 4, lwz_11_11 + l(plt_addr)); |
| write_insn<big_endian>(p + 8, mtctr_11); |
| write_insn<big_endian>(p + 12, bctr); |
| } |
| } |
| |
| // Write out pltresolve branch table. |
| p = oview + this->pltresolve_; |
| unsigned int the_end = oview_size - this->pltresolve_size; |
| unsigned char* end_p = oview + the_end; |
| while (p < end_p - 8 * 4) |
| write_insn<big_endian>(p, b + end_p - p), p += 4; |
| while (p < end_p) |
| write_insn<big_endian>(p, nop), p += 4; |
| |
| // Write out pltresolve call stub. |
| if (parameters->options().output_is_position_independent()) |
| { |
| Address res0_off = this->pltresolve_; |
| Address after_bcl_off = the_end + 12; |
| Address bcl_res0 = after_bcl_off - res0_off; |
| |
| write_insn<big_endian>(p + 0, addis_11_11 + ha(bcl_res0)); |
| write_insn<big_endian>(p + 4, mflr_0); |
| write_insn<big_endian>(p + 8, bcl_20_31); |
| write_insn<big_endian>(p + 12, addi_11_11 + l(bcl_res0)); |
| write_insn<big_endian>(p + 16, mflr_12); |
| write_insn<big_endian>(p + 20, mtlr_0); |
| write_insn<big_endian>(p + 24, sub_11_11_12); |
| |
| Address got_bcl = g_o_t + 4 - (after_bcl_off + this->address()); |
| |
| write_insn<big_endian>(p + 28, addis_12_12 + ha(got_bcl)); |
| if (ha(got_bcl) == ha(got_bcl + 4)) |
| { |
| write_insn<big_endian>(p + 32, lwz_0_12 + l(got_bcl)); |
| write_insn<big_endian>(p + 36, lwz_12_12 + l(got_bcl + 4)); |
| } |
| else |
| { |
| write_insn<big_endian>(p + 32, lwzu_0_12 + l(got_bcl)); |
| write_insn<big_endian>(p + 36, lwz_12_12 + 4); |
| } |
| write_insn<big_endian>(p + 40, mtctr_0); |
| write_insn<big_endian>(p + 44, add_0_11_11); |
| write_insn<big_endian>(p + 48, add_11_0_11); |
| write_insn<big_endian>(p + 52, bctr); |
| write_insn<big_endian>(p + 56, nop); |
| write_insn<big_endian>(p + 60, nop); |
| } |
| else |
| { |
| Address res0 = this->pltresolve_ + this->address(); |
| |
| write_insn<big_endian>(p + 0, lis_12 + ha(g_o_t + 4)); |
| write_insn<big_endian>(p + 4, addis_11_11 + ha(-res0)); |
| if (ha(g_o_t + 4) == ha(g_o_t + 8)) |
| write_insn<big_endian>(p + 8, lwz_0_12 + l(g_o_t + 4)); |
| else |
| write_insn<big_endian>(p + 8, lwzu_0_12 + l(g_o_t + 4)); |
| write_insn<big_endian>(p + 12, addi_11_11 + l(-res0)); |
| write_insn<big_endian>(p + 16, mtctr_0); |
| write_insn<big_endian>(p + 20, add_0_11_11); |
| if (ha(g_o_t + 4) == ha(g_o_t + 8)) |
| write_insn<big_endian>(p + 24, lwz_12_12 + l(g_o_t + 8)); |
| else |
| write_insn<big_endian>(p + 24, lwz_12_12 + 4); |
| write_insn<big_endian>(p + 28, add_11_0_11); |
| write_insn<big_endian>(p + 32, bctr); |
| write_insn<big_endian>(p + 36, nop); |
| write_insn<big_endian>(p + 40, nop); |
| write_insn<big_endian>(p + 44, nop); |
| write_insn<big_endian>(p + 48, nop); |
| write_insn<big_endian>(p + 52, nop); |
| write_insn<big_endian>(p + 56, nop); |
| write_insn<big_endian>(p + 60, nop); |
| } |
| p += 64; |
| } |
| |
| of->write_output_view(off, oview_size, oview); |
| } |
| |
| // Create the glink section. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::make_glink_section(Layout* layout) |
| { |
| if (this->glink_ == NULL) |
| { |
| this->glink_ = new Output_data_glink<size, big_endian>(this); |
| layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, |
| elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, |
| this->glink_, ORDER_TEXT, false); |
| } |
| } |
| |
| // Create a PLT entry for a global symbol. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::make_plt_entry( |
| Layout* layout, |
| Symbol* gsym, |
| const elfcpp::Rela<size, big_endian>& reloc, |
| const Sized_relobj_file<size, big_endian>* object) |
| { |
| if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| && gsym->can_use_relative_reloc(false)) |
| { |
| if (this->iplt_ == NULL) |
| this->make_iplt_section(layout); |
| this->iplt_->add_ifunc_entry(gsym); |
| } |
| else |
| { |
| if (this->plt_ == NULL) |
| this->make_plt_section(layout); |
| this->plt_->add_entry(gsym); |
| } |
| this->glink_->add_entry(object, gsym, reloc); |
| } |
| |
| // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::make_local_ifunc_plt_entry( |
| Layout* layout, |
| const elfcpp::Rela<size, big_endian>& reloc, |
| Sized_relobj_file<size, big_endian>* relobj) |
| { |
| if (this->iplt_ == NULL) |
| this->make_iplt_section(layout); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| this->iplt_->add_local_ifunc_entry(relobj, r_sym); |
| this->glink_->add_entry(relobj, r_sym, reloc); |
| } |
| |
| // Return the number of entries in the PLT. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Target_powerpc<size, big_endian>::plt_entry_count() const |
| { |
| if (this->plt_ == NULL) |
| return 0; |
| unsigned int count = this->plt_->entry_count(); |
| if (this->iplt_ != NULL) |
| count += this->iplt_->entry_count(); |
| return count; |
| } |
| |
| // Return the offset of the first non-reserved PLT entry. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Target_powerpc<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_powerpc<size, big_endian>::plt_entry_size() const |
| { |
| return Output_data_plt_powerpc<size, big_endian>::get_plt_entry_size(); |
| } |
| |
| // Create a GOT entry for local dynamic __tls_get_addr calls. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Target_powerpc<size, big_endian>::tlsld_got_offset( |
| Symbol_table* symtab, |
| Layout* layout, |
| Sized_relobj_file<size, big_endian>* object) |
| { |
| if (this->tlsld_got_offset_ == -1U) |
| { |
| gold_assert(symtab != NULL && layout != NULL && object != NULL); |
| Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
| Output_data_got_powerpc<size, big_endian>* got |
| = this->got_section(symtab, layout); |
| unsigned int got_offset = got->add_constant_pair(0, 0); |
| rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got, |
| got_offset, 0); |
| this->tlsld_got_offset_ = got_offset; |
| } |
| return this->tlsld_got_offset_; |
| } |
| |
| // Get the Reference_flags for a particular relocation. |
| |
| template<int size, bool big_endian> |
| int |
| Target_powerpc<size, big_endian>::Scan::get_reference_flags(unsigned int r_type) |
| { |
| switch (r_type) |
| { |
| case elfcpp::R_POWERPC_NONE: |
| case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| case elfcpp::R_POWERPC_GNU_VTENTRY: |
| case elfcpp::R_PPC64_TOC: |
| // No symbol reference. |
| return 0; |
| |
| case elfcpp::R_PPC64_ADDR64: |
| case elfcpp::R_PPC64_UADDR64: |
| case elfcpp::R_POWERPC_ADDR32: |
| case elfcpp::R_POWERPC_UADDR32: |
| case elfcpp::R_POWERPC_ADDR16: |
| case elfcpp::R_POWERPC_UADDR16: |
| case elfcpp::R_POWERPC_ADDR16_LO: |
| case elfcpp::R_POWERPC_ADDR16_HI: |
| case elfcpp::R_POWERPC_ADDR16_HA: |
| return Symbol::ABSOLUTE_REF; |
| |
| case elfcpp::R_POWERPC_ADDR24: |
| case elfcpp::R_POWERPC_ADDR14: |
| case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| return Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF; |
| |
| case elfcpp::R_PPC64_REL64: |
| case elfcpp::R_POWERPC_REL32: |
| case elfcpp::R_PPC_LOCAL24PC: |
| case elfcpp::R_POWERPC_REL16: |
| case elfcpp::R_POWERPC_REL16_LO: |
| case elfcpp::R_POWERPC_REL16_HI: |
| case elfcpp::R_POWERPC_REL16_HA: |
| return Symbol::RELATIVE_REF; |
| |
| case elfcpp::R_POWERPC_REL24: |
| case elfcpp::R_PPC_PLTREL24: |
| case elfcpp::R_POWERPC_REL14: |
| case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; |
| |
| case elfcpp::R_POWERPC_GOT16: |
| case elfcpp::R_POWERPC_GOT16_LO: |
| case elfcpp::R_POWERPC_GOT16_HI: |
| case elfcpp::R_POWERPC_GOT16_HA: |
| case elfcpp::R_PPC64_GOT16_DS: |
| case elfcpp::R_PPC64_GOT16_LO_DS: |
| case elfcpp::R_PPC64_TOC16: |
| case elfcpp::R_PPC64_TOC16_LO: |
| case elfcpp::R_PPC64_TOC16_HI: |
| case elfcpp::R_PPC64_TOC16_HA: |
| case elfcpp::R_PPC64_TOC16_DS: |
| case elfcpp::R_PPC64_TOC16_LO_DS: |
| // Absolute in GOT. |
| return Symbol::ABSOLUTE_REF; |
| |
| case elfcpp::R_POWERPC_GOT_TPREL16: |
| case elfcpp::R_POWERPC_TLS: |
| return Symbol::TLS_REF; |
| |
| case elfcpp::R_POWERPC_COPY: |
| case elfcpp::R_POWERPC_GLOB_DAT: |
| case elfcpp::R_POWERPC_JMP_SLOT: |
| case elfcpp::R_POWERPC_RELATIVE: |
| case elfcpp::R_POWERPC_DTPMOD: |
| default: |
| // Not expected. We will give an error later. |
| return 0; |
| } |
| } |
| |
| // Report an unsupported relocation against a local symbol. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<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_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object, |
| unsigned int r_type) |
| { |
| gold_assert(r_type != elfcpp::R_POWERPC_NONE); |
| |
| // These are the relocation types supported by glibc for both 32-bit |
| // and 64-bit powerpc. |
| switch (r_type) |
| { |
| case elfcpp::R_POWERPC_NONE: |
| case elfcpp::R_POWERPC_RELATIVE: |
| case elfcpp::R_POWERPC_GLOB_DAT: |
| case elfcpp::R_POWERPC_DTPMOD: |
| case elfcpp::R_POWERPC_DTPREL: |
| case elfcpp::R_POWERPC_TPREL: |
| case elfcpp::R_POWERPC_JMP_SLOT: |
| case elfcpp::R_POWERPC_COPY: |
| case elfcpp::R_POWERPC_IRELATIVE: |
| case elfcpp::R_POWERPC_ADDR32: |
| case elfcpp::R_POWERPC_UADDR32: |
| case elfcpp::R_POWERPC_ADDR24: |
| case elfcpp::R_POWERPC_ADDR16: |
| case elfcpp::R_POWERPC_UADDR16: |
| case elfcpp::R_POWERPC_ADDR16_LO: |
| case elfcpp::R_POWERPC_ADDR16_HI: |
| case elfcpp::R_POWERPC_ADDR16_HA: |
| case elfcpp::R_POWERPC_ADDR14: |
| case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| case elfcpp::R_POWERPC_REL32: |
| case elfcpp::R_POWERPC_REL24: |
| case elfcpp::R_POWERPC_TPREL16: |
| case elfcpp::R_POWERPC_TPREL16_LO: |
| case elfcpp::R_POWERPC_TPREL16_HI: |
| case elfcpp::R_POWERPC_TPREL16_HA: |
| return; |
| |
| default: |
| break; |
| } |
| |
| if (size == 64) |
| { |
| switch (r_type) |
| { |
| // These are the relocation types supported only on 64-bit. |
| case elfcpp::R_PPC64_ADDR64: |
| case elfcpp::R_PPC64_UADDR64: |
| case elfcpp::R_PPC64_JMP_IREL: |
| case elfcpp::R_PPC64_ADDR16_DS: |
| case elfcpp::R_PPC64_ADDR16_LO_DS: |
| case elfcpp::R_PPC64_ADDR16_HIGHER: |
| case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| case elfcpp::R_PPC64_REL64: |
| case elfcpp::R_POWERPC_ADDR30: |
| case elfcpp::R_PPC64_TPREL16_DS: |
| case elfcpp::R_PPC64_TPREL16_LO_DS: |
| case elfcpp::R_PPC64_TPREL16_HIGHER: |
| case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| return; |
| |
| default: |
| break; |
| } |
| } |
| else |
| { |
| switch (r_type) |
| { |
| // These are the relocation types supported only on 32-bit. |
| // ??? glibc ld.so doesn't need to support these. |
| case elfcpp::R_POWERPC_DTPREL16: |
| case elfcpp::R_POWERPC_DTPREL16_LO: |
| case elfcpp::R_POWERPC_DTPREL16_HI: |
| case elfcpp::R_POWERPC_DTPREL16_HA: |
| 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; |
| } |
| |
| // Return whether we need to make a PLT entry for a relocation of the |
| // given type against a STT_GNU_IFUNC symbol. |
| |
| template<int size, bool big_endian> |
| bool |
| Target_powerpc<size, big_endian>::Scan::reloc_needs_plt_for_ifunc( |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int r_type) |
| { |
| // In non-pic code any reference will resolve to the plt call stub |
| // for the ifunc symbol. |
| if (size == 32 && !parameters->options().output_is_position_independent()) |
| return true; |
| |
| switch (r_type) |
| { |
| // Word size refs from data sections are OK. |
| case elfcpp::R_POWERPC_ADDR32: |
| case elfcpp::R_POWERPC_UADDR32: |
| if (size == 32) |
| return true; |
| break; |
| |
| case elfcpp::R_PPC64_ADDR64: |
| case elfcpp::R_PPC64_UADDR64: |
| if (size == 64) |
| return true; |
| break; |
| |
| // GOT refs are good. |
| case elfcpp::R_POWERPC_GOT16: |
| case elfcpp::R_POWERPC_GOT16_LO: |
| case elfcpp::R_POWERPC_GOT16_HI: |
| case elfcpp::R_POWERPC_GOT16_HA: |
| case elfcpp::R_PPC64_GOT16_DS: |
| case elfcpp::R_PPC64_GOT16_LO_DS: |
| return true; |
| |
| // So are function calls. |
| case elfcpp::R_POWERPC_ADDR24: |
| case elfcpp::R_POWERPC_ADDR14: |
| case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| case elfcpp::R_POWERPC_REL24: |
| case elfcpp::R_PPC_PLTREL24: |
| case elfcpp::R_POWERPC_REL14: |
| case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| return true; |
| |
| default: |
| break; |
| } |
| |
| // Anything else is a problem. |
| // If we are building a static executable, the libc startup function |
| // responsible for applying indirect function relocations is going |
| // to complain about the reloc type. |
| // If we are building a dynamic executable, we will have a text |
| // relocation. The dynamic loader will set the text segment |
| // writable and non-executable to apply text relocations. So we'll |
| // segfault when trying to run the indirection function to resolve |
| // the reloc. |
| gold_error(_("%s: unsupported reloc %u for IFUNC symbol"), |
| object->name().c_str(), r_type); |
| return false; |
| } |
| |
| // Scan a relocation for a local symbol. |
| |
| template<int size, bool big_endian> |
| inline void |
| Target_powerpc<size, big_endian>::Scan::local( |
| Symbol_table* symtab, |
| Layout* layout, |
| Target_powerpc<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>& reloc, |
| unsigned int r_type, |
| const elfcpp::Sym<size, big_endian>& lsym, |
| bool is_discarded) |
| { |
| Powerpc_relobj<size, big_endian>* ppc_object |
| = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| |
| if (is_discarded) |
| { |
| if (size == 64 |
| && data_shndx == ppc_object->opd_shndx() |
| && r_type == elfcpp::R_PPC64_ADDR64) |
| ppc_object->set_opd_discard(reloc.get_r_offset()); |
| return; |
| } |
| |
| // A local STT_GNU_IFUNC symbol may require a PLT entry. |
| bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
| if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) |
| target->make_local_ifunc_plt_entry(layout, reloc, object); |
| |
| switch (r_type) |
| { |
| case elfcpp::R_POWERPC_NONE: |
| case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| case elfcpp::R_POWERPC_GNU_VTENTRY: |
| case elfcpp::R_PPC64_TOCSAVE: |
| case elfcpp::R_PPC_EMB_MRKREF: |
| case elfcpp::R_POWERPC_TLS: |
| break; |
| |
| case elfcpp::R_PPC64_TOC: |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| if (parameters->options().output_is_position_independent()) |
| { |
| Address off = reloc.get_r_offset(); |
| if (size == 64 |
| && data_shndx == ppc_object->opd_shndx() |
| && ppc_object->get_opd_discard(off - 8)) |
| break; |
| |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| Powerpc_relobj<size, big_endian>* symobj = ppc_object; |
| rela_dyn->add_output_section_relative(got->output_section(), |
| elfcpp::R_POWERPC_RELATIVE, |
| output_section, |
| object, data_shndx, off, |
| symobj->toc_base_offset()); |
| } |
| } |
| break; |
| |
| case elfcpp::R_PPC64_ADDR64: |
| case elfcpp::R_PPC64_UADDR64: |
| case elfcpp::R_POWERPC_ADDR32: |
| case elfcpp::R_POWERPC_UADDR32: |
| case elfcpp::R_POWERPC_ADDR24: |
| case elfcpp::R_POWERPC_ADDR16: |
| case elfcpp::R_POWERPC_ADDR16_LO: |
| case elfcpp::R_POWERPC_ADDR16_HI: |
| case elfcpp::R_POWERPC_ADDR16_HA: |
| case elfcpp::R_POWERPC_UADDR16: |
| case elfcpp::R_PPC64_ADDR16_HIGHER: |
| case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| case elfcpp::R_PPC64_ADDR16_DS: |
| case elfcpp::R_PPC64_ADDR16_LO_DS: |
| case elfcpp::R_POWERPC_ADDR14: |
| case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| // If building a shared library (or a position-independent |
| // executable), we need to create a dynamic relocation for |
| // this location. |
| if (parameters->options().output_is_position_independent() |
| || (size == 64 && is_ifunc)) |
| { |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| |
| if ((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32) |
| || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64)) |
| { |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; |
| if (is_ifunc) |
| { |
| rela_dyn = target->iplt_section()->rel_plt(); |
| dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| } |
| rela_dyn->add_local_relative(object, r_sym, dynrel, |
| output_section, data_shndx, |
| reloc.get_r_offset(), |
| reloc.get_r_addend(), false); |
| } |
| else |
| { |
| check_non_pic(object, r_type); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| rela_dyn->add_local(object, r_sym, r_type, output_section, |
| data_shndx, reloc.get_r_offset(), |
| reloc.get_r_addend()); |
| } |
| } |
| break; |
| |
| case elfcpp::R_PPC64_REL64: |
| case elfcpp::R_POWERPC_REL32: |
| case elfcpp::R_POWERPC_REL24: |
| case elfcpp::R_PPC_PLTREL24: |
| case elfcpp::R_PPC_LOCAL24PC: |
| case elfcpp::R_POWERPC_REL16: |
| case elfcpp::R_POWERPC_REL16_LO: |
| case elfcpp::R_POWERPC_REL16_HI: |
| case elfcpp::R_POWERPC_REL16_HA: |
| case elfcpp::R_POWERPC_REL14: |
| case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| case elfcpp::R_POWERPC_SECTOFF: |
| case elfcpp::R_POWERPC_TPREL16: |
| case elfcpp::R_POWERPC_DTPREL16: |
| case elfcpp::R_POWERPC_SECTOFF_LO: |
| case elfcpp::R_POWERPC_TPREL16_LO: |
| case elfcpp::R_POWERPC_DTPREL16_LO: |
| case elfcpp::R_POWERPC_SECTOFF_HI: |
| case elfcpp::R_POWERPC_TPREL16_HI: |
| case elfcpp::R_POWERPC_DTPREL16_HI: |
| case elfcpp::R_POWERPC_SECTOFF_HA: |
| case elfcpp::R_POWERPC_TPREL16_HA: |
| case elfcpp::R_POWERPC_DTPREL16_HA: |
| case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| case elfcpp::R_PPC64_TPREL16_HIGHER: |
| case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| case elfcpp::R_PPC64_TPREL16_DS: |
| case elfcpp::R_PPC64_TPREL16_LO_DS: |
| case elfcpp::R_PPC64_DTPREL16_DS: |
| case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| case elfcpp::R_PPC64_SECTOFF_DS: |
| case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| case elfcpp::R_PPC64_TLSGD: |
| case elfcpp::R_PPC64_TLSLD: |
| break; |
| |
| case elfcpp::R_POWERPC_GOT16: |
| case elfcpp::R_POWERPC_GOT16_LO: |
| case elfcpp::R_POWERPC_GOT16_HI: |
| case elfcpp::R_POWERPC_GOT16_HA: |
| case elfcpp::R_PPC64_GOT16_DS: |
| case elfcpp::R_PPC64_GOT16_LO_DS: |
| { |
| // The symbol requires a GOT entry. |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| |
| if (!parameters->options().output_is_position_independent()) |
| { |
| if (size == 32 && is_ifunc) |
| got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
| else |
| got->add_local(object, r_sym, GOT_TYPE_STANDARD); |
| } |
| else if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)) |
| { |
| // If we are generating a shared object or a pie, this |
| // symbol's GOT entry will be set by a dynamic relocation. |
| unsigned int off; |
| off = got->add_constant(0); |
| object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off); |
| |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; |
| if (is_ifunc) |
| { |
| rela_dyn = target->iplt_section()->rel_plt(); |
| dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| } |
| rela_dyn->add_local_relative(object, r_sym, dynrel, |
| got, off, 0, false); |
| } |
| } |
| break; |
| |
| case elfcpp::R_PPC64_TOC16: |
| case elfcpp::R_PPC64_TOC16_LO: |
| case elfcpp::R_PPC64_TOC16_HI: |
| case elfcpp::R_PPC64_TOC16_HA: |
| case elfcpp::R_PPC64_TOC16_DS: |
| case elfcpp::R_PPC64_TOC16_LO_DS: |
| // We need a GOT section. |
| target->got_section(symtab, layout); |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_TLSGD16: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| { |
| const tls::Tls_optimization tls_type = target->optimize_tls_gd(true); |
| if (tls_type == tls::TLSOPT_NONE) |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| got->add_local_tls_pair(object, r_sym, GOT_TYPE_TLSGD, |
| rela_dyn, elfcpp::R_POWERPC_DTPMOD); |
| } |
| else if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| // no GOT relocs needed for Local Exec. |
| } |
| else |
| gold_unreachable(); |
| } |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_TLSLD16: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| { |
| const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| if (tls_type == tls::TLSOPT_NONE) |
| target->tlsld_got_offset(symtab, layout, object); |
| else if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| // no GOT relocs needed for Local Exec. |
| if (parameters->options().emit_relocs()) |
| { |
| Output_section* os = layout->tls_segment()->first_section(); |
| gold_assert(os != NULL); |
| os->set_needs_symtab_index(); |
| } |
| } |
| else |
| gold_unreachable(); |
| } |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_DTPREL16: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| got->add_local_tls(object, r_sym, GOT_TYPE_DTPREL); |
| } |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_TPREL16: |
| case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| { |
| const tls::Tls_optimization tls_type = target->optimize_tls_ie(true); |
| if (tls_type == tls::TLSOPT_NONE) |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| got->add_local_tls(object, r_sym, GOT_TYPE_TPREL); |
| } |
| else if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| // no GOT relocs needed for Local Exec. |
| } |
| else |
| gold_unreachable(); |
| } |
| break; |
| |
| default: |
| unsupported_reloc_local(object, r_type); |
| break; |
| } |
| } |
| |
| // Report an unsupported relocation against a global symbol. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<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()); |
| } |
| |
| // Scan a relocation for a global symbol. |
| |
| template<int size, bool big_endian> |
| inline void |
| Target_powerpc<size, big_endian>::Scan::global( |
| Symbol_table* symtab, |
| Layout* layout, |
| Target_powerpc<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>& reloc, |
| unsigned int r_type, |
| Symbol* gsym) |
| { |
| Powerpc_relobj<size, big_endian>* ppc_object |
| = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| |
| // A STT_GNU_IFUNC symbol may require a PLT entry. |
| if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| && this->reloc_needs_plt_for_ifunc(object, r_type)) |
| target->make_plt_entry(layout, gsym, reloc, object); |
| |
| switch (r_type) |
| { |
| case elfcpp::R_POWERPC_NONE: |
| case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| case elfcpp::R_POWERPC_GNU_VTENTRY: |
| case elfcpp::R_PPC_LOCAL24PC: |
| case elfcpp::R_PPC_EMB_MRKREF: |
| case elfcpp::R_POWERPC_TLS: |
| break; |
| |
| case elfcpp::R_PPC64_TOC: |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| if (parameters->options().output_is_position_independent()) |
| { |
| Address off = reloc.get_r_offset(); |
| if (size == 64 |
| && data_shndx == ppc_object->opd_shndx() |
| && ppc_object->get_opd_discard(off - 8)) |
| break; |
| |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| Powerpc_relobj<size, big_endian>* symobj = ppc_object; |
| if (data_shndx != ppc_object->opd_shndx()) |
| symobj = static_cast |
| <Powerpc_relobj<size, big_endian>*>(gsym->object()); |
| rela_dyn->add_output_section_relative(got->output_section(), |
| elfcpp::R_POWERPC_RELATIVE, |
| output_section, |
| object, data_shndx, off, |
| symobj->toc_base_offset()); |
| } |
| } |
| break; |
| |
| case elfcpp::R_PPC64_ADDR64: |
| if (size == 64 |
| && data_shndx == ppc_object->opd_shndx() |
| && (gsym->is_defined_in_discarded_section() |
| || gsym->object() != object)) |
| { |
| ppc_object->set_opd_discard(reloc.get_r_offset()); |
| break; |
| } |
| // Fall thru |
| case elfcpp::R_PPC64_UADDR64: |
| case elfcpp::R_POWERPC_ADDR32: |
| case elfcpp::R_POWERPC_UADDR32: |
| case elfcpp::R_POWERPC_ADDR24: |
| case elfcpp::R_POWERPC_ADDR16: |
| case elfcpp::R_POWERPC_ADDR16_LO: |
| case elfcpp::R_POWERPC_ADDR16_HI: |
| case elfcpp::R_POWERPC_ADDR16_HA: |
| case elfcpp::R_POWERPC_UADDR16: |
| case elfcpp::R_PPC64_ADDR16_HIGHER: |
| case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| case elfcpp::R_PPC64_ADDR16_DS: |
| case elfcpp::R_PPC64_ADDR16_LO_DS: |
| case elfcpp::R_POWERPC_ADDR14: |
| case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| { |
| // Make a PLT entry if necessary. |
| if (gsym->needs_plt_entry()) |
| { |
| target->make_plt_entry(layout, gsym, reloc, 0); |
| // 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 call stub. |
| if (size == 32 |
| && gsym->is_from_dynobj() |
| && !parameters->options().output_is_position_independent()) |
| gsym->set_needs_dynsym_value(); |
| } |
| // Make a dynamic relocation if necessary. |
| if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type)) |
| || (size == 64 && gsym->type() == elfcpp::STT_GNU_IFUNC)) |
| { |
| if (gsym->may_need_copy_reloc()) |
| { |
| target->copy_reloc(symtab, layout, object, |
| data_shndx, output_section, gsym, reloc); |
| } |
| else if (((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32) |
| || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64)) |
| && (gsym->can_use_relative_reloc(false) |
| || (size == 64 |
| && data_shndx == ppc_object->opd_shndx()))) |
| { |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; |
| if (gsym->type() == elfcpp::STT_GNU_IFUNC) |
| { |
| rela_dyn = target->iplt_section()->rel_plt(); |
| dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| } |
| rela_dyn->add_symbolless_global_addend( |
| gsym, dynrel, output_section, object, data_shndx, |
| reloc.get_r_offset(), reloc.get_r_addend()); |
| } |
| else |
| { |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| check_non_pic(object, r_type); |
| rela_dyn->add_global(gsym, r_type, output_section, |
| object, data_shndx, |
| reloc.get_r_offset(), |
| reloc.get_r_addend()); |
| } |
| } |
| } |
| break; |
| |
| case elfcpp::R_PPC_PLTREL24: |
| case elfcpp::R_POWERPC_REL24: |
| if (gsym->needs_plt_entry() |
| || (!gsym->final_value_is_known() |
| && (gsym->is_undefined() |
| || gsym->is_from_dynobj() |
| || gsym->is_preemptible()))) |
| target->make_plt_entry(layout, gsym, reloc, object); |
| // Fall thru |
| |
| case elfcpp::R_PPC64_REL64: |
| case elfcpp::R_POWERPC_REL32: |
| // Make a dynamic relocation if necessary. |
| if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type))) |
| { |
| if (gsym->may_need_copy_reloc()) |
| { |
| target->copy_reloc(symtab, layout, object, |
| data_shndx, output_section, gsym, |
| reloc); |
| } |
| else |
| { |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| check_non_pic(object, r_type); |
| rela_dyn->add_global(gsym, r_type, output_section, object, |
| data_shndx, reloc.get_r_offset(), |
| reloc.get_r_addend()); |
| } |
| } |
| break; |
| |
| case elfcpp::R_POWERPC_REL16: |
| case elfcpp::R_POWERPC_REL16_LO: |
| case elfcpp::R_POWERPC_REL16_HI: |
| case elfcpp::R_POWERPC_REL16_HA: |
| case elfcpp::R_POWERPC_REL14: |
| case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| case elfcpp::R_POWERPC_SECTOFF: |
| case elfcpp::R_POWERPC_TPREL16: |
| case elfcpp::R_POWERPC_DTPREL16: |
| case elfcpp::R_POWERPC_SECTOFF_LO: |
| case elfcpp::R_POWERPC_TPREL16_LO: |
| case elfcpp::R_POWERPC_DTPREL16_LO: |
| case elfcpp::R_POWERPC_SECTOFF_HI: |
| case elfcpp::R_POWERPC_TPREL16_HI: |
| case elfcpp::R_POWERPC_DTPREL16_HI: |
| case elfcpp::R_POWERPC_SECTOFF_HA: |
| case elfcpp::R_POWERPC_TPREL16_HA: |
| case elfcpp::R_POWERPC_DTPREL16_HA: |
| case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| case elfcpp::R_PPC64_TPREL16_HIGHER: |
| case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| case elfcpp::R_PPC64_TPREL16_DS: |
| case elfcpp::R_PPC64_TPREL16_LO_DS: |
| case elfcpp::R_PPC64_DTPREL16_DS: |
| case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| case elfcpp::R_PPC64_SECTOFF_DS: |
| case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| case elfcpp::R_PPC64_TLSGD: |
| case elfcpp::R_PPC64_TLSLD: |
| break; |
| |
| case elfcpp::R_POWERPC_GOT16: |
| case elfcpp::R_POWERPC_GOT16_LO: |
| case elfcpp::R_POWERPC_GOT16_HI: |
| case elfcpp::R_POWERPC_GOT16_HA: |
| case elfcpp::R_PPC64_GOT16_DS: |
| case elfcpp::R_PPC64_GOT16_LO_DS: |
| { |
| // The symbol requires a GOT entry. |
| Output_data_got_powerpc<size, big_endian>* got; |
| |
| got = target->got_section(symtab, layout); |
| if (gsym->final_value_is_known()) |
| { |
| if (size == 32 && gsym->type() == elfcpp::STT_GNU_IFUNC) |
| got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| else |
| got->add_global(gsym, GOT_TYPE_STANDARD); |
| } |
| else if (!gsym->has_got_offset(GOT_TYPE_STANDARD)) |
| { |
| // If we are generating a shared object or a pie, this |
| // symbol's GOT entry will be set by a dynamic relocation. |
| unsigned int off = got->add_constant(0); |
| gsym->set_got_offset(GOT_TYPE_STANDARD, off); |
| |
| Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| if (gsym->can_use_relative_reloc(false) |
| && !(size == 32 |
| && gsym->visibility() == elfcpp::STV_PROTECTED |
| && parameters->options().shared())) |
| { |
| unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; |
| if (gsym->type() == elfcpp::STT_GNU_IFUNC) |
| { |
| rela_dyn = target->iplt_section()->rel_plt(); |
| dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| } |
| rela_dyn->add_global_relative(gsym, dynrel, got, off, 0, false); |
| } |
| else |
| { |
| unsigned int dynrel = elfcpp::R_POWERPC_GLOB_DAT; |
| rela_dyn->add_global(gsym, dynrel, got, off, 0); |
| } |
| } |
| } |
| break; |
| |
| case elfcpp::R_PPC64_TOC16: |
| case elfcpp::R_PPC64_TOC16_LO: |
| case elfcpp::R_PPC64_TOC16_HI: |
| case elfcpp::R_PPC64_TOC16_HA: |
| case elfcpp::R_PPC64_TOC16_DS: |
| case elfcpp::R_PPC64_TOC16_LO_DS: |
| // We need a GOT section. |
| target->got_section(symtab, layout); |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_TLSGD16: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| { |
| const bool final = gsym->final_value_is_known(); |
| const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| if (tls_type == tls::TLSOPT_NONE) |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| got->add_global_pair_with_rel(gsym, GOT_TYPE_TLSGD, |
| target->rela_dyn_section(layout), |
| elfcpp::R_POWERPC_DTPMOD, |
| elfcpp::R_POWERPC_DTPREL); |
| } |
| else if (tls_type == tls::TLSOPT_TO_IE) |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| got->add_global_with_rel(gsym, GOT_TYPE_TPREL, |
| target->rela_dyn_section(layout), |
| elfcpp::R_POWERPC_TPREL); |
| } |
| else if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| // no GOT relocs needed for Local Exec. |
| } |
| else |
| gold_unreachable(); |
| } |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_TLSLD16: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| { |
| const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| if (tls_type == tls::TLSOPT_NONE) |
| target->tlsld_got_offset(symtab, layout, object); |
| else if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| // no GOT relocs needed for Local Exec. |
| if (parameters->options().emit_relocs()) |
| { |
| Output_section* os = layout->tls_segment()->first_section(); |
| gold_assert(os != NULL); |
| os->set_needs_symtab_index(); |
| } |
| } |
| else |
| gold_unreachable(); |
| } |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_DTPREL16: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| if (!gsym->final_value_is_known() |
| && (gsym->is_from_dynobj() |
| || gsym->is_undefined() |
| || gsym->is_preemptible())) |
| got->add_global_with_rel(gsym, GOT_TYPE_DTPREL, |
| target->rela_dyn_section(layout), |
| elfcpp::R_POWERPC_DTPREL); |
| else |
| got->add_global_tls(gsym, GOT_TYPE_DTPREL); |
| } |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_TPREL16: |
| case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| { |
| const bool final = gsym->final_value_is_known(); |
| const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| if (tls_type == tls::TLSOPT_NONE) |
| { |
| Output_data_got_powerpc<size, big_endian>* got |
| = target->got_section(symtab, layout); |
| if (!gsym->final_value_is_known() |
| && (gsym->is_from_dynobj() |
| || gsym->is_undefined() |
| || gsym->is_preemptible())) |
| got->add_global_with_rel(gsym, GOT_TYPE_TPREL, |
| target->rela_dyn_section(layout), |
| elfcpp::R_POWERPC_TPREL); |
| else |
| got->add_global_tls(gsym, GOT_TYPE_TPREL); |
| } |
| else if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| // no GOT relocs needed for Local Exec. |
| } |
| else |
| gold_unreachable(); |
| } |
| break; |
| |
| default: |
| unsupported_reloc_global(object, r_type, gsym); |
| break; |
| } |
| } |
| |
| // Process relocations for gc. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::gc_process_relocs( |
| Symbol_table* symtab, |
| Layout* layout, |
| Sized_relobj_file<size, big_endian>* object, |
| unsigned int data_shndx, |
| unsigned int, |
| 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) |
| { |
| typedef Target_powerpc<size, big_endian> Powerpc; |
| typedef typename Target_powerpc<size, big_endian>::Scan Scan; |
| Powerpc_relobj<size, big_endian>* ppc_object |
| = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| if (size == 64) |
| ppc_object->set_opd_valid(); |
| if (size == 64 && data_shndx == ppc_object->opd_shndx()) |
| { |
| typename Powerpc_relobj<size, big_endian>::Access_from::iterator p; |
| for (p = ppc_object->access_from_map()->begin(); |
| p != ppc_object->access_from_map()->end(); |
| ++p) |
| { |
| Address dst_off = p->first; |
| unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); |
| typename Powerpc_relobj<size, big_endian>::Section_refs::iterator s; |
| for (s = p->second.begin(); s != p->second.end(); ++s) |
| { |
| Object* src_obj = s->first; |
| unsigned int src_indx = s->second; |
| symtab->gc()->add_reference(src_obj, src_indx, |
| ppc_object, dst_indx); |
| } |
| p->second.clear(); |
| } |
| ppc_object->access_from_map()->clear(); |
| ppc_object->process_gc_mark(symtab); |
| // Don't look at .opd relocs as .opd will reference everything. |
| return; |
| } |
| |
| gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan, |
| typename Target_powerpc::Relocatable_size_for_reloc>( |
| symtab, |
| layout, |
| this, |
| object, |
| data_shndx, |
| prelocs, |
| reloc_count, |
| output_section, |
| needs_special_offset_handling, |
| local_symbol_count, |
| plocal_symbols); |
| } |
| |
| // Handle target specific gc actions when adding a gc reference from |
| // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX |
| // and DST_OFF. For powerpc64, this adds a referenc to the code |
| // section of a function descriptor. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::do_gc_add_reference( |
| Symbol_table* symtab, |
| Object* src_obj, |
| unsigned int src_shndx, |
| Object* dst_obj, |
| unsigned int dst_shndx, |
| Address dst_off) const |
| { |
| Powerpc_relobj<size, big_endian>* ppc_object |
| = static_cast<Powerpc_relobj<size, big_endian>*>(dst_obj); |
| if (size == 64 && dst_shndx == ppc_object->opd_shndx()) |
| { |
| if (ppc_object->opd_valid()) |
| { |
| dst_shndx = ppc_object->get_opd_ent(dst_off); |
| symtab->gc()->add_reference(src_obj, src_shndx, dst_obj, dst_shndx); |
| } |
| else |
| { |
| // If we haven't run scan_opd_relocs, we must delay |
| // processing this function descriptor reference. |
| ppc_object->add_reference(src_obj, src_shndx, dst_off); |
| } |
| } |
| } |
| |
| // Add any special sections for this symbol to the gc work list. |
| // For powerpc64, this adds the code section of a function |
| // descriptor. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::do_gc_mark_symbol( |
| Symbol_table* symtab, |
| Symbol* sym) const |
| { |
| if (size == 64) |
| { |
| Powerpc_relobj<size, big_endian>* ppc_object |
| = static_cast<Powerpc_relobj<size, big_endian>*>(sym->object()); |
| bool is_ordinary; |
| unsigned int shndx = sym->shndx(&is_ordinary); |
| if (is_ordinary && shndx == ppc_object->opd_shndx()) |
| { |
| Sized_symbol<size>* gsym = symtab->get_sized_symbol<size>(sym); |
| Address dst_off = gsym->value(); |
| if (ppc_object->opd_valid()) |
| { |
| unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); |
| symtab->gc()->worklist().push(Section_id(ppc_object, dst_indx)); |
| } |
| else |
| ppc_object->add_gc_mark(dst_off); |
| } |
| } |
| } |
| |
| // Scan relocations for a section. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<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) |
| { |
| typedef Target_powerpc<size, big_endian> Powerpc; |
| typedef typename Target_powerpc<size, big_endian>::Scan Scan; |
| |
| if (sh_type == elfcpp::SHT_REL) |
| { |
| gold_error(_("%s: unsupported REL reloc section"), |
| object->name().c_str()); |
| return; |
| } |
| |
| if (size == 32) |
| { |
| static Output_data_space* sdata; |
| |
| // Define _SDA_BASE_ at the start of the .sdata section. |
| if (sdata == NULL) |
| { |
| // layout->find_output_section(".sdata") == NULL |
| sdata = new Output_data_space(4, "** sdata"); |
| Output_section* os |
| = layout->add_output_section_data(".sdata", 0, |
| elfcpp::SHF_ALLOC |
| | elfcpp::SHF_WRITE, |
| sdata, ORDER_SMALL_DATA, false); |
| symtab->define_in_output_data("_SDA_BASE_", NULL, |
| Symbol_table::PREDEFINED, |
| os, 32768, 0, elfcpp::STT_OBJECT, |
| elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN, |
| 0, false, false); |
| } |
| } |
| |
| gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>( |
| symtab, |
| layout, |
| this, |
| object, |
| data_shndx, |
| prelocs, |
| reloc_count, |
| output_section, |
| needs_special_offset_handling, |
| local_symbol_count, |
| plocal_symbols); |
| } |
| |
| // Functor class for processing the global symbol table. |
| // Removes symbols defined on discarded opd entries. |
| |
| template<bool big_endian> |
| class Global_symbol_visitor_opd |
| { |
| public: |
| Global_symbol_visitor_opd() |
| { } |
| |
| void |
| operator()(Sized_symbol<64>* sym) |
| { |
| if (sym->has_symtab_index() |
| || sym->source() != Symbol::FROM_OBJECT |
| || !sym->in_real_elf()) |
| return; |
| |
| Powerpc_relobj<64, big_endian>* symobj |
| = static_cast<Powerpc_relobj<64, big_endian>*>(sym->object()); |
| if (symobj->is_dynamic() |
| || symobj->opd_shndx() == 0) |
| return; |
| |
| bool is_ordinary; |
| unsigned int shndx = sym->shndx(&is_ordinary); |
| if (shndx == symobj->opd_shndx() |
| && symobj->get_opd_discard(sym->value())) |
| sym->set_symtab_index(-1U); |
| } |
| }; |
| |
| // Finalize the sections. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<size, big_endian>::do_finalize_sections( |
| Layout* layout, |
| const Input_objects*, |
| Symbol_table* symtab) |
| { |
| if (parameters->doing_static_link()) |
| { |
| // At least some versions of glibc elf-init.o have a strong |
| // reference to __rela_iplt marker syms. A weak ref would be |
| // better.. |
| if (this->iplt_ != NULL) |
| { |
| Reloc_section* rel = this->iplt_->rel_plt(); |
| symtab->define_in_output_data("__rela_iplt_start", NULL, |
| Symbol_table::PREDEFINED, 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, rel, 0, 0, |
| elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| elfcpp::STV_HIDDEN, 0, true, true); |
| } |
| else |
| { |
| symtab->define_as_constant("__rela_iplt_start", NULL, |
| Symbol_table::PREDEFINED, 0, 0, |
| elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| elfcpp::STV_HIDDEN, 0, true, false); |
| symtab->define_as_constant("__rela_iplt_end", NULL, |
| Symbol_table::PREDEFINED, 0, 0, |
| elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| elfcpp::STV_HIDDEN, 0, true, false); |
| } |
| } |
| |
| if (size == 64) |
| { |
| typedef Global_symbol_visitor_opd<big_endian> Symbol_visitor; |
| symtab->for_all_symbols<64, Symbol_visitor>(Symbol_visitor()); |
| } |
| |
| // Fill in some more dynamic tags. |
| Output_data_dynamic* odyn = layout->dynamic_data(); |
| if (odyn != NULL) |
| { |
| const Reloc_section* rel_plt = (this->plt_ == NULL |
| ? NULL |
| : this->plt_->rel_plt()); |
| layout->add_target_dynamic_tags(false, this->plt_, rel_plt, |
| this->rela_dyn_, true, size == 32); |
| |
| if (size == 32) |
| { |
| if (this->got_ != NULL) |
| { |
| this->got_->finalize_data_size(); |
| odyn->add_section_plus_offset(elfcpp::DT_PPC_GOT, |
| this->got_, this->got_->g_o_t()); |
| } |
| } |
| else |
| { |
| if (this->glink_ != NULL) |
| { |
| this->glink_->finalize_data_size(); |
| odyn->add_section_plus_offset(elfcpp::DT_PPC64_GLINK, |
| this->glink_, |
| (this->glink_->pltresolve() |
| + this->glink_->pltresolve_size |
| - 32)); |
| } |
| } |
| } |
| |
| // 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)); |
| } |
| |
| // Return the value to use for a branch relocation. |
| |
| template<int size, bool big_endian> |
| typename elfcpp::Elf_types<size>::Elf_Addr |
| Target_powerpc<size, big_endian>::symval_for_branch( |
| Address value, |
| const Sized_symbol<size>* gsym, |
| Powerpc_relobj<size, big_endian>* object, |
| unsigned int *dest_shndx) |
| { |
| *dest_shndx = 0; |
| if (size == 32) |
| return value; |
| |
| // If the symbol is defined in an opd section, ie. is a function |
| // descriptor, use the function descriptor code entry address |
| Powerpc_relobj<size, big_endian>* symobj = object; |
| if (gsym != NULL) |
| symobj = static_cast<Powerpc_relobj<size, big_endian>*>(gsym->object()); |
| unsigned int shndx = symobj->opd_shndx(); |
| if (shndx == 0) |
| return value; |
| Address opd_addr = symobj->get_output_section_offset(shndx); |
| gold_assert(opd_addr != invalid_address); |
| opd_addr += symobj->output_section(shndx)->address(); |
| if (value >= opd_addr && value < opd_addr + symobj->section_size(shndx)) |
| { |
| Address sec_off; |
| *dest_shndx = symobj->get_opd_ent(value - opd_addr, &sec_off); |
| Address sec_addr = symobj->get_output_section_offset(*dest_shndx); |
| gold_assert(sec_addr != invalid_address); |
| sec_addr += symobj->output_section(*dest_shndx)->address(); |
| value = sec_addr + sec_off; |
| } |
| return value; |
| } |
| |
| // Perform a relocation. |
| |
| template<int size, bool big_endian> |
| inline bool |
| Target_powerpc<size, big_endian>::Relocate::relocate( |
| const Relocate_info<size, big_endian>* relinfo, |
| Target_powerpc* target, |
| Output_section* os, |
| 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, |
| Address address, |
| section_size_type view_size) |
| { |
| |
| bool is_tls_call = ((r_type == elfcpp::R_POWERPC_REL24 |
| || r_type == elfcpp::R_PPC_PLTREL24) |
| && gsym != NULL |
| && strcmp(gsym->name(), "__tls_get_addr") == 0); |
| enum skip_tls last_tls = this->call_tls_get_addr_; |
| this->call_tls_get_addr_ = CALL_NOT_EXPECTED; |
| if (is_tls_call) |
| { |
| if (last_tls == CALL_NOT_EXPECTED) |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("__tls_get_addr call lacks marker reloc")); |
| else if (last_tls == CALL_SKIP) |
| return false; |
| } |
| else if (last_tls != CALL_NOT_EXPECTED) |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("missing expected __tls_get_addr call")); |
| |
| typedef Powerpc_relocate_functions<size, big_endian> Reloc; |
| typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn; |
| Powerpc_relobj<size, big_endian>* const object |
| = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); |
| Address value = 0; |
| bool has_plt_value = false; |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| if (gsym != NULL |
| ? use_plt_offset<size>(gsym, Scan::get_reference_flags(r_type)) |
| : object->local_has_plt_offset(r_sym)) |
| { |
| const Output_data_glink<size, big_endian>* glink |
| = target->glink_section(); |
| unsigned int glink_index; |
| if (gsym != NULL) |
| glink_index = glink->find_entry(object, gsym, rela); |
| else |
| glink_index = glink->find_entry(object, r_sym, rela); |
| value = glink->address() + glink_index * glink->glink_entry_size(); |
| has_plt_value = true; |
| } |
| |
| if (r_type == elfcpp::R_POWERPC_GOT16 |
| || r_type == elfcpp::R_POWERPC_GOT16_LO |
| || r_type == elfcpp::R_POWERPC_GOT16_HI |
| || r_type == elfcpp::R_POWERPC_GOT16_HA |
| || r_type == elfcpp::R_PPC64_GOT16_DS |
| || r_type == elfcpp::R_PPC64_GOT16_LO_DS) |
| { |
| if (gsym != NULL) |
| { |
| gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
| value = gsym->got_offset(GOT_TYPE_STANDARD); |
| } |
| 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)); |
| value = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); |
| } |
| value -= target->got_section()->got_base_offset(object); |
| } |
| else if (r_type == elfcpp::R_PPC64_TOC) |
| { |
| value = (target->got_section()->output_section()->address() |
| + object->toc_base_offset()); |
| } |
| else if (gsym != NULL |
| && (r_type == elfcpp::R_POWERPC_REL24 |
| || r_type == elfcpp::R_PPC_PLTREL24) |
| && has_plt_value) |
| { |
| if (size == 64) |
| { |
| typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; |
| Valtype* wv = reinterpret_cast<Valtype*>(view); |
| bool can_plt_call = false; |
| if (rela.get_r_offset() + 8 <= view_size) |
| { |
| Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv); |
| Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1); |
| if ((insn & 1) != 0 |
| && (insn2 == nop |
| || insn2 == cror_15_15_15 || insn2 == cror_31_31_31)) |
| { |
| elfcpp::Swap<32, big_endian>::writeval(wv + 1, ld_2_1 + 40); |
| can_plt_call = true; |
| } |
| } |
| if (!can_plt_call) |
| { |
| // If we don't have a branch and link followed by a nop, |
| // we can't go via the plt because there is no place to |
| // put a toc restoring instruction. |
| // Unless we know we won't be returning. |
| if (strcmp(gsym->name(), "__libc_start_main") == 0) |
| can_plt_call = true; |
| } |
| if (!can_plt_call) |
| { |
| // This is not an error in one special case: A self |
| // call. It isn't possible to cheaply verify we have |
| // such a call so just check for a call to the same |
| // section. |
| bool ok = false; |
| Address code = value; |
| if (gsym->source() == Symbol::FROM_OBJECT |
| && gsym->object() == object) |
| { |
| Address addend = rela.get_r_addend(); |
| unsigned int dest_shndx; |
| Address opdent = psymval->value(object, addend); |
| code = target->symval_for_branch(opdent, gsym, object, |
| &dest_shndx); |
| bool is_ordinary; |
| if (dest_shndx == 0) |
| dest_shndx = gsym->shndx(&is_ordinary); |
| ok = dest_shndx == relinfo->data_shndx; |
| } |
| if (!ok) |
| { |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("call lacks nop, can't restore toc; " |
| "recompile with -fPIC")); |
| value = code; |
| } |
| } |
| } |
| } |
| else if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) |
| { |
| // First instruction of a global dynamic sequence, arg setup insn. |
| const bool final = gsym == NULL || gsym->final_value_is_known(); |
| const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| enum Got_type got_type = GOT_TYPE_STANDARD; |
| if (tls_type == tls::TLSOPT_NONE) |
| got_type = GOT_TYPE_TLSGD; |
| else if (tls_type == tls::TLSOPT_TO_IE) |
| got_type = GOT_TYPE_TPREL; |
| if (got_type != GOT_TYPE_STANDARD) |
| { |
| if (gsym != NULL) |
| { |
| gold_assert(gsym->has_got_offset(got_type)); |
| value = gsym->got_offset(got_type); |
| } |
| 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)); |
| value = object->local_got_offset(r_sym, got_type); |
| } |
| value -= target->got_section()->got_base_offset(object); |
| } |
| if (tls_type == tls::TLSOPT_TO_IE) |
| { |
| if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); |
| Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| insn &= (1 << 26) - (1 << 16); // extract rt,ra from addi |
| if (size == 32) |
| insn |= 32 << 26; // lwz |
| else |
| insn |= 58 << 26; // ld |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| } |
| r_type += (elfcpp::R_POWERPC_GOT_TPREL16 |
| - elfcpp::R_POWERPC_GOT_TLSGD16); |
| } |
| else if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); |
| Insn insn = addis_3_13; |
| if (size == 32) |
| insn = addis_3_2; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| value = psymval->value(object, rela.get_r_addend()); |
| } |
| else |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); |
| Insn insn = nop; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_NONE; |
| } |
| } |
| } |
| else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO |
| || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI |
| || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) |
| { |
| // First instruction of a local dynamic sequence, arg setup insn. |
| const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| if (tls_type == tls::TLSOPT_NONE) |
| { |
| value = target->tlsld_got_offset(); |
| value -= target->got_section()->got_base_offset(object); |
| } |
| else |
| { |
| gold_assert(tls_type == tls::TLSOPT_TO_LE); |
| if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); |
| Insn insn = addis_3_13; |
| if (size == 32) |
| insn = addis_3_2; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| value = dtp_offset; |
| } |
| else |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); |
| Insn insn = nop; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_NONE; |
| } |
| } |
| } |
| else if (r_type == elfcpp::R_POWERPC_GOT_DTPREL16 |
| || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_LO |
| || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HI |
| || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HA) |
| { |
| // Accesses relative to a local dynamic sequence address, |
| // no optimisation here. |
| if (gsym != NULL) |
| { |
| gold_assert(gsym->has_got_offset(GOT_TYPE_DTPREL)); |
| value = gsym->got_offset(GOT_TYPE_DTPREL); |
| } |
| 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_DTPREL)); |
| value = object->local_got_offset(r_sym, GOT_TYPE_DTPREL); |
| } |
| value -= target->got_section()->got_base_offset(object); |
| } |
| else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO |
| || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI |
| || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) |
| { |
| // First instruction of initial exec sequence. |
| const bool final = gsym == NULL || gsym->final_value_is_known(); |
| const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| if (tls_type == tls::TLSOPT_NONE) |
| { |
| if (gsym != NULL) |
| { |
| gold_assert(gsym->has_got_offset(GOT_TYPE_TPREL)); |
| value = gsym->got_offset(GOT_TYPE_TPREL); |
| } |
| 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_TPREL)); |
| value = object->local_got_offset(r_sym, GOT_TYPE_TPREL); |
| } |
| value -= target->got_section()->got_base_offset(object); |
| } |
| else |
| { |
| gold_assert(tls_type == tls::TLSOPT_TO_LE); |
| if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); |
| Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| insn &= (1 << 26) - (1 << 21); // extract rt from ld |
| if (size == 32) |
| insn |= addis_0_2; |
| else |
| insn |= addis_0_13; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| value = psymval->value(object, rela.get_r_addend()); |
| } |
| else |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); |
| Insn insn = nop; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_NONE; |
| } |
| } |
| } |
| else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| { |
| // Second instruction of a global dynamic sequence, |
| // the __tls_get_addr call |
| this->call_tls_get_addr_ = CALL_EXPECTED; |
| const bool final = gsym == NULL || gsym->final_value_is_known(); |
| const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| if (tls_type != tls::TLSOPT_NONE) |
| { |
| if (tls_type == tls::TLSOPT_TO_IE) |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view); |
| Insn insn = add_3_3_13; |
| if (size == 32) |
| insn = add_3_3_2; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_NONE; |
| } |
| else |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view); |
| Insn insn = addi_3_3; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| view += 2 * big_endian; |
| value = psymval->value(object, rela.get_r_addend()); |
| } |
| this->call_tls_get_addr_ = CALL_SKIP; |
| } |
| } |
| else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| { |
| // Second instruction of a local dynamic sequence, |
| // the __tls_get_addr call |
| this->call_tls_get_addr_ = CALL_EXPECTED; |
| const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view); |
| Insn insn = addi_3_3; |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| this->call_tls_get_addr_ = CALL_SKIP; |
| r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| view += 2 * big_endian; |
| value = dtp_offset; |
| } |
| } |
| else if (r_type == elfcpp::R_POWERPC_TLS) |
| { |
| // Second instruction of an initial exec sequence |
| const bool final = gsym == NULL || gsym->final_value_is_known(); |
| const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| if (tls_type == tls::TLSOPT_TO_LE) |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view); |
| Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| unsigned int reg = size == 32 ? 2 : 13; |
| insn = at_tls_transform(insn, reg); |
| gold_assert(insn != 0); |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| view += 2 * big_endian; |
| value = psymval->value(object, rela.get_r_addend()); |
| } |
| } |
| else if (!has_plt_value) |
| { |
| Address addend = 0; |
| unsigned int dest_shndx; |
| if (r_type != elfcpp::R_PPC_PLTREL24) |
| addend = rela.get_r_addend(); |
| value = psymval->value(object, addend); |
| if (size == 64 && is_branch_reloc(r_type)) |
| value = target->symval_for_branch(value, gsym, object, &dest_shndx); |
| } |
| |
| switch (r_type) |
| { |
| case elfcpp::R_PPC64_REL64: |
| case elfcpp::R_POWERPC_REL32: |
| case elfcpp::R_POWERPC_REL24: |
| case elfcpp::R_PPC_PLTREL24: |
| case elfcpp::R_PPC_LOCAL24PC: |
| case elfcpp::R_POWERPC_REL16: |
| case elfcpp::R_POWERPC_REL16_LO: |
| case elfcpp::R_POWERPC_REL16_HI: |
| case elfcpp::R_POWERPC_REL16_HA: |
| case elfcpp::R_POWERPC_REL14: |
| case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| value -= address; |
| break; |
| |
| case elfcpp::R_PPC64_TOC16: |
| case elfcpp::R_PPC64_TOC16_LO: |
| case elfcpp::R_PPC64_TOC16_HI: |
| case elfcpp::R_PPC64_TOC16_HA: |
| case elfcpp::R_PPC64_TOC16_DS: |
| case elfcpp::R_PPC64_TOC16_LO_DS: |
| // Subtract the TOC base address. |
| value -= (target->got_section()->output_section()->address() |
| + object->toc_base_offset()); |
| break; |
| |
| case elfcpp::R_POWERPC_SECTOFF: |
| case elfcpp::R_POWERPC_SECTOFF_LO: |
| case elfcpp::R_POWERPC_SECTOFF_HI: |
| case elfcpp::R_POWERPC_SECTOFF_HA: |
| case elfcpp::R_PPC64_SECTOFF_DS: |
| case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| if (os != NULL) |
| value -= os->address(); |
| break; |
| |
| case elfcpp::R_PPC64_TPREL16_DS: |
| case elfcpp::R_PPC64_TPREL16_LO_DS: |
| if (size != 64) |
| // R_PPC_TLSGD and R_PPC_TLSLD |
| break; |
| case elfcpp::R_POWERPC_TPREL16: |
| case elfcpp::R_POWERPC_TPREL16_LO: |
| case elfcpp::R_POWERPC_TPREL16_HI: |
| case elfcpp::R_POWERPC_TPREL16_HA: |
| case elfcpp::R_POWERPC_TPREL: |
| case elfcpp::R_PPC64_TPREL16_HIGHER: |
| case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| // tls symbol values are relative to tls_segment()->vaddr() |
| value -= tp_offset; |
| break; |
| |
| case elfcpp::R_PPC64_DTPREL16_DS: |
| case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| if (size != 64) |
| // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16, R_PPC_EMB_NADDR16_LO |
| // R_PPC_EMB_NADDR16_HI, R_PPC_EMB_NADDR16_HA, R_PPC_EMB_SDAI16 |
| break; |
| case elfcpp::R_POWERPC_DTPREL16: |
| case elfcpp::R_POWERPC_DTPREL16_LO: |
| case elfcpp::R_POWERPC_DTPREL16_HI: |
| case elfcpp::R_POWERPC_DTPREL16_HA: |
| case elfcpp::R_POWERPC_DTPREL: |
| // tls symbol values are relative to tls_segment()->vaddr() |
| value -= dtp_offset; |
| break; |
| |
| default: |
| break; |
| } |
| |
| Insn branch_bit = 0; |
| switch (r_type) |
| { |
| case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| branch_bit = 1 << 21; |
| case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| { |
| Insn* iview = reinterpret_cast<Insn*>(view); |
| Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| insn &= ~(1 << 21); |
| insn |= branch_bit; |
| if (this->is_isa_v2) |
| { |
| // Set 'a' bit. This is 0b00010 in BO field for branch |
| // on CR(BI) insns (BO == 001at or 011at), and 0b01000 |
| // for branch on CTR insns (BO == 1a00t or 1a01t). |
| if ((insn & (0x14 << 21)) == (0x04 << 21)) |
| insn |= 0x02 << 21; |
| else if ((insn & (0x14 << 21)) == (0x10 << 21)) |
| insn |= 0x08 << 21; |
| else |
| break; |
| } |
| else |
| { |
| // Invert 'y' bit if not the default. |
| if (static_cast<Signed_address>(value) < 0) |
| insn ^= 1 << 21; |
| } |
| elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| } |
| break; |
| |
| default: |
| break; |
| } |
| |
| typename Reloc::Overflow_check overflow = Reloc::CHECK_NONE; |
| switch (r_type) |
| { |
| case elfcpp::R_POWERPC_ADDR32: |
| case elfcpp::R_POWERPC_UADDR32: |
| if (size == 64) |
| overflow = Reloc::CHECK_BITFIELD; |
| break; |
| |
| case elfcpp::R_POWERPC_REL32: |
| if (size == 64) |
| overflow = Reloc::CHECK_SIGNED; |
| break; |
| |
| case elfcpp::R_POWERPC_ADDR24: |
| case elfcpp::R_POWERPC_ADDR16: |
| case elfcpp::R_POWERPC_UADDR16: |
| case elfcpp::R_PPC64_ADDR16_DS: |
| case elfcpp::R_POWERPC_ADDR14: |
| case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| overflow = Reloc::CHECK_BITFIELD; |
| break; |
| |
| case elfcpp::R_POWERPC_REL24: |
| case elfcpp::R_PPC_PLTREL24: |
| case elfcpp::R_PPC_LOCAL24PC: |
| case elfcpp::R_POWERPC_REL16: |
| case elfcpp::R_PPC64_TOC16: |
| case elfcpp::R_POWERPC_GOT16: |
| case elfcpp::R_POWERPC_SECTOFF: |
| case elfcpp::R_POWERPC_TPREL16: |
| case elfcpp::R_POWERPC_DTPREL16: |
| case elfcpp::R_PPC64_TPREL16_DS: |
| case elfcpp::R_PPC64_DTPREL16_DS: |
| case elfcpp::R_PPC64_TOC16_DS: |
| case elfcpp::R_PPC64_GOT16_DS: |
| case elfcpp::R_PPC64_SECTOFF_DS: |
| case elfcpp::R_POWERPC_REL14: |
| case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| case elfcpp::R_POWERPC_GOT_TLSGD16: |
| case elfcpp::R_POWERPC_GOT_TLSLD16: |
| case elfcpp::R_POWERPC_GOT_TPREL16: |
| case elfcpp::R_POWERPC_GOT_DTPREL16: |
| overflow = Reloc::CHECK_SIGNED; |
| break; |
| } |
| |
| typename Powerpc_relocate_functions<size, big_endian>::Status status |
| = Powerpc_relocate_functions<size, big_endian>::STATUS_OK; |
| switch (r_type) |
| { |
| case elfcpp::R_POWERPC_NONE: |
| case elfcpp::R_POWERPC_TLS: |
| case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| case elfcpp::R_POWERPC_GNU_VTENTRY: |
| case elfcpp::R_PPC_EMB_MRKREF: |
| break; |
| |
| case elfcpp::R_PPC64_ADDR64: |
| case elfcpp::R_PPC64_REL64: |
| case elfcpp::R_PPC64_TOC: |
| Reloc::addr64(view, value); |
| break; |
| |
| case elfcpp::R_POWERPC_TPREL: |
| case elfcpp::R_POWERPC_DTPREL: |
| if (size == 64) |
| Reloc::addr64(view, value); |
| else |
| status = Reloc::addr32(view, value, overflow); |
| break; |
| |
| case elfcpp::R_PPC64_UADDR64: |
| Reloc::addr64_u(view, value); |
| break; |
| |
| case elfcpp::R_POWERPC_ADDR32: |
| case elfcpp::R_POWERPC_REL32: |
| status = Reloc::addr32(view, value, overflow); |
| break; |
| |
| case elfcpp::R_POWERPC_UADDR32: |
| status = Reloc::addr32_u(view, value, overflow); |
| break; |
| |
| case elfcpp::R_POWERPC_ADDR24: |
| case elfcpp::R_POWERPC_REL24: |
| case elfcpp::R_PPC_PLTREL24: |
| case elfcpp::R_PPC_LOCAL24PC: |
| status = Reloc::addr24(view, value, overflow); |
| break; |
| |
| case elfcpp::R_POWERPC_GOT_DTPREL16: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| if (size == 64) |
| { |
| status = Reloc::addr16_ds(view, value, overflow); |
| break; |
| } |
| case elfcpp::R_POWERPC_ADDR16: |
| case elfcpp::R_POWERPC_REL16: |
| case elfcpp::R_PPC64_TOC16: |
| case elfcpp::R_POWERPC_GOT16: |
| case elfcpp::R_POWERPC_SECTOFF: |
| case elfcpp::R_POWERPC_TPREL16: |
| case elfcpp::R_POWERPC_DTPREL16: |
| case elfcpp::R_POWERPC_GOT_TLSGD16: |
| case elfcpp::R_POWERPC_GOT_TLSLD16: |
| case elfcpp::R_POWERPC_GOT_TPREL16: |
| case elfcpp::R_POWERPC_ADDR16_LO: |
| case elfcpp::R_POWERPC_REL16_LO: |
| case elfcpp::R_PPC64_TOC16_LO: |
| case elfcpp::R_POWERPC_GOT16_LO: |
| case elfcpp::R_POWERPC_SECTOFF_LO: |
| case elfcpp::R_POWERPC_TPREL16_LO: |
| case elfcpp::R_POWERPC_DTPREL16_LO: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| status = Reloc::addr16(view, value, overflow); |
| break; |
| |
| case elfcpp::R_POWERPC_UADDR16: |
| status = Reloc::addr16_u(view, value, overflow); |
| break; |
| |
| case elfcpp::R_POWERPC_ADDR16_HI: |
| case elfcpp::R_POWERPC_REL16_HI: |
| case elfcpp::R_PPC64_TOC16_HI: |
| case elfcpp::R_POWERPC_GOT16_HI: |
| case elfcpp::R_POWERPC_SECTOFF_HI: |
| case elfcpp::R_POWERPC_TPREL16_HI: |
| case elfcpp::R_POWERPC_DTPREL16_HI: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| Reloc::addr16_hi(view, value); |
| break; |
| |
| case elfcpp::R_POWERPC_ADDR16_HA: |
| case elfcpp::R_POWERPC_REL16_HA: |
| case elfcpp::R_PPC64_TOC16_HA: |
| case elfcpp::R_POWERPC_GOT16_HA: |
| case elfcpp::R_POWERPC_SECTOFF_HA: |
| case elfcpp::R_POWERPC_TPREL16_HA: |
| case elfcpp::R_POWERPC_DTPREL16_HA: |
| case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| Reloc::addr16_ha(view, value); |
| break; |
| |
| case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| if (size == 32) |
| // R_PPC_EMB_NADDR16_LO |
| goto unsupp; |
| case elfcpp::R_PPC64_ADDR16_HIGHER: |
| case elfcpp::R_PPC64_TPREL16_HIGHER: |
| Reloc::addr16_hi2(view, value); |
| break; |
| |
| case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| if (size == 32) |
| // R_PPC_EMB_NADDR16_HI |
| goto unsupp; |
| case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| Reloc::addr16_ha2(view, value); |
| break; |
| |
| case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| if (size == 32) |
| // R_PPC_EMB_NADDR16_HA |
| goto unsupp; |
| case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| Reloc::addr16_hi3(view, value); |
| break; |
| |
| case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| if (size == 32) |
| // R_PPC_EMB_SDAI16 |
| goto unsupp; |
| case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| Reloc::addr16_ha3(view, value); |
| break; |
| |
| case elfcpp::R_PPC64_DTPREL16_DS: |
| case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| if (size == 32) |
| // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16 |
| goto unsupp; |
| case elfcpp::R_PPC64_TPREL16_DS: |
| case elfcpp::R_PPC64_TPREL16_LO_DS: |
| if (size == 32) |
| // R_PPC_TLSGD, R_PPC_TLSLD |
| break; |
| case elfcpp::R_PPC64_ADDR16_DS: |
| case elfcpp::R_PPC64_ADDR16_LO_DS: |
| case elfcpp::R_PPC64_TOC16_DS: |
| case elfcpp::R_PPC64_TOC16_LO_DS: |
| case elfcpp::R_PPC64_GOT16_DS: |
| case elfcpp::R_PPC64_GOT16_LO_DS: |
| case elfcpp::R_PPC64_SECTOFF_DS: |
| case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| status = Reloc::addr16_ds(view, value, overflow); |
| break; |
| |
| case elfcpp::R_POWERPC_ADDR14: |
| case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| case elfcpp::R_POWERPC_REL14: |
| case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| status = Reloc::addr14(view, value, overflow); |
| break; |
| |
| case elfcpp::R_POWERPC_COPY: |
| case elfcpp::R_POWERPC_GLOB_DAT: |
| case elfcpp::R_POWERPC_JMP_SLOT: |
| case elfcpp::R_POWERPC_RELATIVE: |
| case elfcpp::R_POWERPC_DTPMOD: |
| case elfcpp::R_PPC64_JMP_IREL: |
| case elfcpp::R_POWERPC_IRELATIVE: |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("unexpected reloc %u in object file"), |
| r_type); |
| break; |
| |
| case elfcpp::R_PPC_EMB_SDA21: |
| if (size == 32) |
| goto unsupp; |
| else |
| { |
| // R_PPC64_TOCSAVE. For the time being this can be ignored. |
| } |
| break; |
| |
| case elfcpp::R_PPC_EMB_SDA2I16: |
| case elfcpp::R_PPC_EMB_SDA2REL: |
| if (size == 32) |
| goto unsupp; |
| // R_PPC64_TLSGD, R_PPC64_TLSLD |
| break; |
| |
| case elfcpp::R_POWERPC_PLT32: |
| case elfcpp::R_POWERPC_PLTREL32: |
| case elfcpp::R_POWERPC_PLT16_LO: |
| case elfcpp::R_POWERPC_PLT16_HI: |
| case elfcpp::R_POWERPC_PLT16_HA: |
| case elfcpp::R_PPC_SDAREL16: |
| case elfcpp::R_POWERPC_ADDR30: |
| case elfcpp::R_PPC64_PLT64: |
| case elfcpp::R_PPC64_PLTREL64: |
| case elfcpp::R_PPC64_PLTGOT16: |
| case elfcpp::R_PPC64_PLTGOT16_LO: |
| case elfcpp::R_PPC64_PLTGOT16_HI: |
| case elfcpp::R_PPC64_PLTGOT16_HA: |
| case elfcpp::R_PPC64_PLT16_LO_DS: |
| case elfcpp::R_PPC64_PLTGOT16_DS: |
| case elfcpp::R_PPC64_PLTGOT16_LO_DS: |
| case elfcpp::R_PPC_EMB_RELSEC16: |
| case elfcpp::R_PPC_EMB_RELST_LO: |
| case elfcpp::R_PPC_EMB_RELST_HI: |
| case elfcpp::R_PPC_EMB_RELST_HA: |
| case elfcpp::R_PPC_EMB_BIT_FLD: |
| case elfcpp::R_PPC_EMB_RELSDA: |
| case elfcpp::R_PPC_TOC16: |
| default: |
| unsupp: |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("unsupported reloc %u"), |
| r_type); |
| break; |
| } |
| if (status != Powerpc_relocate_functions<size, big_endian>::STATUS_OK) |
| gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| _("relocation overflow")); |
| |
| return true; |
| } |
| |
| // Relocate section data. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<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, |
| Address address, |
| section_size_type view_size, |
| const Reloc_symbol_changes* reloc_symbol_changes) |
| { |
| typedef Target_powerpc<size, big_endian> Powerpc; |
| typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate; |
| |
| gold_assert(sh_type == elfcpp::SHT_RELA); |
| |
| unsigned char *opd_rel = NULL; |
| Powerpc_relobj<size, big_endian>* const object |
| = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); |
| if (size == 64 |
| && relinfo->data_shndx == object->opd_shndx()) |
| { |
| // Rewrite opd relocs, omitting those for discarded sections |
| // to silence gold::relocate_section errors. |
| const int reloc_size |
| = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; |
| opd_rel = new unsigned char[reloc_count * reloc_size]; |
| const unsigned char* rrel = prelocs; |
| unsigned char* wrel = opd_rel; |
| |
| for (size_t i = 0; |
| i < reloc_count; |
| ++i, rrel += reloc_size, wrel += reloc_size) |
| { |
| typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc |
| reloc(rrel); |
| typename elfcpp::Elf_types<size>::Elf_WXword r_info |
| = reloc.get_r_info(); |
| unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| Address r_off = reloc.get_r_offset(); |
| if (r_type == elfcpp::R_PPC64_TOC) |
| r_off -= 8; |
| bool is_discarded = object->get_opd_discard(r_off); |
| |
| // Reloc number is reported in some errors, so keep all relocs. |
| if (is_discarded) |
| memset(wrel, 0, reloc_size); |
| else |
| memcpy(wrel, rrel, reloc_size); |
| } |
| prelocs = opd_rel; |
| } |
| |
| gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA, |
| Powerpc_relocate>( |
| relinfo, |
| this, |
| prelocs, |
| reloc_count, |
| output_section, |
| needs_special_offset_handling, |
| view, |
| address, |
| view_size, |
| reloc_symbol_changes); |
| |
| if (opd_rel != NULL) |
| delete[] opd_rel; |
| } |
| |
| class Powerpc_scan_relocatable_reloc |
| { |
| public: |
| // Return the strategy to use for a local symbol which is not a |
| // section symbol, given the relocation type. |
| inline Relocatable_relocs::Reloc_strategy |
| local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym) |
| { |
| if (r_type == 0 && r_sym == 0) |
| return Relocatable_relocs::RELOC_DISCARD; |
| return Relocatable_relocs::RELOC_COPY; |
| } |
| |
| // Return the strategy to use for a local symbol which is a section |
| // symbol, given the relocation type. |
| inline Relocatable_relocs::Reloc_strategy |
| local_section_strategy(unsigned int, Relobj*) |
| { |
| return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; |
| } |
| |
| // Return the strategy to use for a global symbol, given the |
| // relocation type, the object, and the symbol index. |
| inline Relocatable_relocs::Reloc_strategy |
| global_strategy(unsigned int r_type, Relobj*, unsigned int) |
| { |
| if (r_type == elfcpp::R_PPC_PLTREL24) |
| return Relocatable_relocs::RELOC_SPECIAL; |
| return Relocatable_relocs::RELOC_COPY; |
| } |
| }; |
| |
| // Scan the relocs during a relocatable link. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<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); |
| |
| gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, |
| Powerpc_scan_relocatable_reloc>( |
| symtab, |
| layout, |
| object, |
| data_shndx, |
| prelocs, |
| reloc_count, |
| output_section, |
| needs_special_offset_handling, |
| local_symbol_count, |
| plocal_symbols, |
| rr); |
| } |
| |
| // Emit relocations for a section. |
| // This is a modified version of the function by the same name in |
| // target-reloc.h. Using relocate_special_relocatable for |
| // R_PPC_PLTREL24 would require duplication of the entire body of the |
| // loop, so we may as well duplicate the whole thing. |
| |
| template<int size, bool big_endian> |
| void |
| Target_powerpc<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, |
| off_t offset_in_output_section, |
| const Relocatable_relocs* rr, |
| unsigned char*, |
| Address view_address, |
| section_size_type, |
| unsigned char* reloc_view, |
| section_size_type reloc_view_size) |
| { |
| gold_assert(sh_type == elfcpp::SHT_RELA); |
| |
| typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc |
| Reltype; |
| typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc_write |
| Reltype_write; |
| const int reloc_size |
| = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; |
| |
| Powerpc_relobj<size, big_endian>* const object |
| = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); |
| const unsigned int local_count = object->local_symbol_count(); |
| unsigned int got2_shndx = object->got2_shndx(); |
| Address got2_addend = 0; |
| if (got2_shndx != 0) |
| { |
| got2_addend = object->get_output_section_offset(got2_shndx); |
| gold_assert(got2_addend != invalid_address); |
| } |
| |
| unsigned char* pwrite = reloc_view; |
| bool zap_next = false; |
| for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
| { |
| Relocatable_relocs::Reloc_strategy strategy = rr->strategy(i); |
| if (strategy == Relocatable_relocs::RELOC_DISCARD) |
| continue; |
| |
| Reltype reloc(prelocs); |
| Reltype_write reloc_write(pwrite); |
| |
| Address offset = reloc.get_r_offset(); |
| typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); |
| unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| const unsigned int orig_r_sym = r_sym; |
| typename elfcpp::Elf_types<size>::Elf_Swxword addend |
| = reloc.get_r_addend(); |
| const Symbol* gsym = NULL; |
| |
| if (zap_next) |
| { |
| // We could arrange to discard these and other relocs for |
| // tls optimised sequences in the strategy methods, but for |
| // now do as BFD ld does. |
| r_type = elfcpp::R_POWERPC_NONE; |
| zap_next = false; |
| } |
| |
| // Get the new symbol index. |
| if (r_sym < local_count) |
| { |
| switch (strategy) |
| { |
| case Relocatable_relocs::RELOC_COPY: |
| case Relocatable_relocs::RELOC_SPECIAL: |
| if (r_sym != 0) |
| { |
| r_sym = object->symtab_index(r_sym); |
| gold_assert(r_sym != -1U); |
| } |
| break; |
| |
| case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA: |
| { |
| // We are adjusting a section symbol. We need to find |
| // the symbol table index of the section symbol for |
| // the output section corresponding to input section |
| // in which this symbol is defined. |
| gold_assert(r_sym < local_count); |
| bool is_ordinary; |
| unsigned int shndx = |
| object->local_symbol_input_shndx(r_sym, &is_ordinary); |
| gold_assert(is_ordinary); |
| Output_section* os = object->output_section(shndx); |
| gold_assert(os != NULL); |
| gold_assert(os->needs_symtab_index()); |
| r_sym = os->symtab_index(); |
| } |
| break; |
| |
| default: |
| gold_unreachable(); |
| } |
| } |
| else |
| { |
| gsym = object->global_symbol(r_sym); |
| gold_assert(gsym != NULL); |
| if (gsym->is_forwarder()) |
| gsym = relinfo->symtab->resolve_forwards(gsym); |
| |
| gold_assert(gsym->has_symtab_index()); |
| r_sym = gsym->symtab_index(); |
| } |
| |
| // Get the new offset--the location in the output section where |
| // this relocation should be applied. |
| if (static_cast<Address>(offset_in_output_section) != invalid_address) |
| offset += offset_in_output_section; |
| else |
| { |
| section_offset_type sot_offset = |
| convert_types<section_offset_type, Address>(offset); |
| section_offset_type new_sot_offset = |
| output_section->output_offset(object, relinfo->data_shndx, |
| sot_offset); |
| gold_assert(new_sot_offset != -1); |
| offset = new_sot_offset; |
| } |
| |
| // In an object file, r_offset is an offset within the section. |
| // In an executable or dynamic object, generated by |
| // --emit-relocs, r_offset is an absolute address. |
| if (!parameters->options().relocatable()) |
| { |
| offset += view_address; |
| if (static_cast<Address>(offset_in_output_section) != invalid_address) |
| offset -= offset_in_output_section; |
| } |
| |
| // Handle the reloc addend based on the strategy. |
| if (strategy == Relocatable_relocs::RELOC_COPY) |
| ; |
| else if (strategy == Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA) |
| { |
| const Symbol_value<size>* psymval = object->local_symbol(orig_r_sym); |
| addend = psymval->value(object, addend); |
| } |
| else if (strategy == Relocatable_relocs::RELOC_SPECIAL) |
| { |
| if (addend >= 32768) |
| addend += got2_addend; |
| } |
| else |
| gold_unreachable(); |
| |
| if (!parameters->options().relocatable()) |
| { |
| if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) |
| { |
| // First instruction of a global dynamic sequence, |
| // arg setup insn. |
| const bool final = gsym == NULL || gsym->final_value_is_known(); |
| switch (this->optimize_tls_gd(final)) |
| { |
| case tls::TLSOPT_TO_IE: |
| r_type += (elfcpp::R_POWERPC_GOT_TPREL16 |
| - elfcpp::R_POWERPC_GOT_TLSGD16); |
| break; |
| case tls::TLSOPT_TO_LE: |
| if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| else |
| { |
| r_type = elfcpp::R_POWERPC_NONE; |
| offset -= 2 * big_endian; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO |
| || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI |
| || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) |
| { |
| // First instruction of a local dynamic sequence, |
| // arg setup insn. |
| if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) |
| { |
| if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) |
| { |
| r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| const Output_section* os = relinfo->layout->tls_segment() |
| ->first_section(); |
| gold_assert(os != NULL); |
| gold_assert(os->needs_symtab_index()); |
| r_sym = os->symtab_index(); |
| addend = dtp_offset; |
| } |
| else |
| { |
| r_type = elfcpp::R_POWERPC_NONE; |
| offset -= 2 * big_endian; |
| } |
| } |
| } |
| else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO |
| || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI |
| || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) |
| { |
| // First instruction of initial exec sequence. |
| const bool final = gsym == NULL || gsym->final_value_is_known(); |
| if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) |
| { |
| if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) |
| r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| else |
| { |
| r_type = elfcpp::R_POWERPC_NONE; |
| offset -= 2 * big_endian; |
| } |
| } |
| } |
| else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| { |
| // Second instruction of a global dynamic sequence, |
| // the __tls_get_addr call |
| const bool final = gsym == NULL || gsym->final_value_is_known(); |
| switch (this->optimize_tls_gd(final)) |
| { |
| case tls::TLSOPT_TO_IE: |
| r_type = elfcpp::R_POWERPC_NONE; |
| zap_next = true; |
| break; |
| case tls::TLSOPT_TO_LE: |
| r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| offset += 2 * big_endian; |
| zap_next = true; |
| break; |
| default: |
| break; |
| } |
| } |
| else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| { |
| // Second instruction of a local dynamic sequence, |
| // the __tls_get_addr call |
| if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) |
| { |
| const Output_section* os = relinfo->layout->tls_segment() |
| ->first_section(); |
| gold_assert(os != NULL); |
| gold_assert(os->needs_symtab_index()); |
| r_sym = os->symtab_index(); |
| addend = dtp_offset; |
| r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| offset += 2 * big_endian; |
| zap_next = true; |
| } |
| } |
| else if (r_type == elfcpp::R_POWERPC_TLS) |
| { |
| // Second instruction of an initial exec sequence |
| const bool final = gsym == NULL || gsym->final_value_is_known(); |
| if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) |
| { |
| r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| offset += 2 * big_endian; |
| } |
| } |
| } |
| |
| reloc_write.put_r_offset(offset); |
| reloc_write.put_r_info(elfcpp::elf_r_info<size>(r_sym, r_type)); |
| reloc_write.put_r_addend(addend); |
| |
| pwrite += reloc_size; |
| } |
| |
| gold_assert(static_cast<section_size_type>(pwrite - reloc_view) |
| == reloc_view_size); |
| } |
| |
| // 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_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
| { |
| if (size == 32) |
| { |
| gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
| const Output_data_glink<size, big_endian>* glink = this->glink_section(); |
| unsigned int glink_index = glink->find_entry(gsym); |
| return glink->address() + glink_index * glink->glink_entry_size(); |
| } |
| else |
| gold_unreachable(); |
| } |
| |
| // Return the PLT address to use for a local symbol. |
| template<int size, bool big_endian> |
| uint64_t |
| Target_powerpc<size, big_endian>::do_plt_address_for_local( |
| const Relobj* object, |
| unsigned int symndx) const |
| { |
| if (size == 32) |
| { |
| const Sized_relobj<size, big_endian>* relobj |
| = static_cast<const Sized_relobj<size, big_endian>*>(object); |
| const Output_data_glink<size, big_endian>* glink = this->glink_section(); |
| unsigned int glink_index = glink->find_entry(relobj->sized_relobj(), |
| symndx); |
| return glink->address() + glink_index * glink->glink_entry_size(); |
| } |
| else |
| gold_unreachable(); |
| } |
| |
| // Return the PLT address to use for a global symbol. |
| template<int size, bool big_endian> |
| uint64_t |
| Target_powerpc<size, big_endian>::do_plt_address_for_global( |
| const Symbol* gsym) const |
| { |
| if (size == 32) |
| { |
| const Output_data_glink<size, big_endian>* glink = this->glink_section(); |
| unsigned int glink_index = glink->find_entry(gsym); |
| return glink->address() + glink_index * glink->glink_entry_size(); |
| } |
| else |
| gold_unreachable(); |
| } |
| |
| // Return the offset to use for the GOT_INDX'th got entry which is |
| // for a local tls symbol specified by OBJECT, SYMNDX. |
| template<int size, bool big_endian> |
| int64_t |
| Target_powerpc<size, big_endian>::do_tls_offset_for_local( |
| const Relobj* object, |
| unsigned int symndx, |
| unsigned int got_indx) const |
| { |
| const Powerpc_relobj<size, big_endian>* ppc_object |
| = static_cast<const Powerpc_relobj<size, big_endian>*>(object); |
| if (ppc_object->local_symbol(symndx)->is_tls_symbol()) |
| { |
| for (Got_type got_type = GOT_TYPE_TLSGD; |
| got_type <= GOT_TYPE_TPREL; |
| got_type = Got_type(got_type + 1)) |
| if (ppc_object->local_has_got_offset(symndx, got_type)) |
| { |
| unsigned int off = ppc_object->local_got_offset(symndx, got_type); |
| if (got_type == GOT_TYPE_TLSGD) |
| off += size / 8; |
| if (off == got_indx * (size / 8)) |
| { |
| if (got_type == GOT_TYPE_TPREL) |
| return -tp_offset; |
| else |
| return -dtp_offset; |
| } |
| } |
| } |
| gold_unreachable(); |
| } |
| |
| // Return the offset to use for the GOT_INDX'th got entry which is |
| // for global tls symbol GSYM. |
| template<int size, bool big_endian> |
| int64_t |
| Target_powerpc<size, big_endian>::do_tls_offset_for_global( |
| Symbol* gsym, |
| unsigned int got_indx) const |
| { |
| if (gsym->type() == elfcpp::STT_TLS) |
| { |
| for (Got_type got_type = GOT_TYPE_TLSGD; |
| got_type <= GOT_TYPE_TPREL; |
| got_type = Got_type(got_type + 1)) |
| if (gsym->has_got_offset(got_type)) |
| { |
| unsigned int off = gsym->got_offset(got_type); |
| if (got_type == GOT_TYPE_TLSGD) |
| off += size / 8; |
| if (off == got_indx * (size / 8)) |
| { |
| if (got_type == GOT_TYPE_TPREL) |
| return -tp_offset; |
| else |
| return -dtp_offset; |
| } |
| } |
| } |
| gold_unreachable(); |
| } |
| |
| // The selector for powerpc object files. |
| |
| template<int size, bool big_endian> |
| class Target_selector_powerpc : public Target_selector |
| { |
| public: |
| Target_selector_powerpc() |
| : Target_selector(elfcpp::EM_NONE, size, big_endian, |
| (size == 64 |
| ? (big_endian ? "elf64-powerpc" : "elf64-powerpcle") |
| : (big_endian ? "elf32-powerpc" : "elf32-powerpcle")), |
| (size == 64 |
| ? (big_endian ? "elf64ppc" : "elf64lppc") |
| : (big_endian ? "elf32ppc" : "elf32lppc"))) |
| { } |
| |
| virtual Target* |
| do_recognize(Input_file*, off_t, int machine, int, int) |
| { |
| switch (size) |
| { |
| case 64: |
| if (machine != elfcpp::EM_PPC64) |
| return NULL; |
| break; |
| |
| case 32: |
| if (machine != elfcpp::EM_PPC) |
| return NULL; |
| break; |
| |
| default: |
| return NULL; |
| } |
| |
| return this->instantiate_target(); |
| } |
| |
| virtual Target* |
| do_instantiate_target() |
| { return new Target_powerpc<size, big_endian>(); } |
| }; |
| |
| Target_selector_powerpc<32, true> target_selector_ppc32; |
| Target_selector_powerpc<32, false> target_selector_ppc32le; |
| Target_selector_powerpc<64, true> target_selector_ppc64; |
| Target_selector_powerpc<64, false> target_selector_ppc64le; |
| |
| } // End anonymous namespace. |
