// powerpc.cc -- powerpc target support for gold. // Copyright 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. // Written by David S. Miller // and David Edelsohn // 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 class Output_data_plt_powerpc; template class Output_data_got_powerpc; template class Output_data_glink; template class Powerpc_relobj : public Sized_relobj_file { public: typedef typename elfcpp::Elf_types::Elf_Addr Address; typedef typename elfcpp::Elf_types::Elf_Off Offset; typedef Unordered_set Section_refs; typedef Unordered_map Access_from; Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset, const typename elfcpp::Ehdr& ehdr) : Sized_relobj_file(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::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::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* 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_; // 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 class Target_powerpc : public Sized_target { public: typedef Output_data_reloc Reloc_section; typedef typename elfcpp::Elf_types::Elf_Addr Address; typedef typename elfcpp::Elf_types::Elf_Swxword Signed_address; static const Address invalid_address = static_cast
(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(&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* 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* 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; } // Provide linker defined save/restore functions. void define_save_restore_funcs(Layout*, Symbol_table*); // 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*, 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* 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*, 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* plt_section() const { gold_assert(this->plt_ != NULL); return this->plt_; } // Get the IPLT section. const Output_data_plt_powerpc* iplt_section() const { gold_assert(this->iplt_ != NULL); return this->iplt_; } // Get the .glink section. const Output_data_glink* glink_section() const { gold_assert(this->glink_ != NULL); return this->glink_; } // Get the GOT section. const Output_data_got_powerpc* 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&); // 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::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* object, unsigned int data_shndx, Output_section* output_section, const elfcpp::Rela& reloc, unsigned int r_type, const elfcpp::Sym& lsym, bool is_discarded); inline void global(Symbol_table* symtab, Layout* layout, Target_powerpc* target, Sized_relobj_file* object, unsigned int data_shndx, Output_section* output_section, const elfcpp::Rela& reloc, unsigned int r_type, Symbol* gsym); inline bool local_reloc_may_be_function_pointer(Symbol_table* , Layout* , Target_powerpc* , Sized_relobj_file* , unsigned int , Output_section* , const elfcpp::Rela& , unsigned int , const elfcpp::Sym&) { return false; } inline bool global_reloc_may_be_function_pointer(Symbol_table* , Layout* , Target_powerpc* , Sized_relobj_file* , unsigned int , Output_section* , const elfcpp::Rela& , unsigned int , Symbol*) { return false; } private: static void unsupported_reloc_local(Sized_relobj_file*, unsigned int r_type); static void unsupported_reloc_global(Sized_relobj_file*, 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* 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* gsym, Powerpc_relobj* 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*, Target_powerpc*, Output_section*, size_t relnum, const elfcpp::Rela&, unsigned int r_type, const Sized_symbol*, const Symbol_value*, unsigned char*, typename elfcpp::Elf_types::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* 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&, const Sized_relobj_file* object); // Create a PLT entry for a local IFUNC symbol. void make_local_ifunc_plt_entry(Layout*, const elfcpp::Rela&, Sized_relobj_file*); // Create a GOT entry for local dynamic __tls_get_addr. unsigned int tlsld_got_offset(Symbol_table* symtab, Layout* layout, Sized_relobj_file* 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* object, unsigned int shndx, Output_section* output_section, Symbol* sym, const elfcpp::Rela& reloc) { this->copy_relocs_.copy_reloc(symtab, layout, symtab->get_sized_symbol(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* got_; // The PLT output section. Output_data_plt_powerpc* plt_; // The IPLT output section. Output_data_plt_powerpc* iplt_; // The .glink output section. Output_data_glink* glink_; // The dynamic reloc output section. Reloc_section* rela_dyn_; // Relocs saved to avoid a COPY reloc. Copy_relocs 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 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 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(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 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 This; typedef typename elfcpp::Elf_types::Elf_Addr Address; template static inline bool has_overflow_signed(Address value) { // limit = 1 << (valsize - 1) without shift count exceeding size of type Address limit = static_cast
(1) << ((valsize - 1) >> 1); limit <<= ((valsize - 1) >> 1); limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); return value + limit > (limit << 1) - 1; } template static inline bool has_overflow_bitfield(Address value) { Address limit = static_cast
(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 static inline Status overflowed(Address value, Overflow_check overflow) { if (overflow == CHECK_SIGNED) { if (has_overflow_signed(value)) return STATUS_OVERFLOW; } else if (overflow == CHECK_BITFIELD) { if (has_overflow_bitfield(value)) return STATUS_OVERFLOW; } return STATUS_OK; } // Do a simple RELA relocation template static inline Status rela(unsigned char* view, Address value, Overflow_check overflow) { typedef typename elfcpp::Swap::Valtype Valtype; Valtype* wv = reinterpret_cast(view); elfcpp::Swap::writeval(wv, value); return overflowed(value, overflow); } template static inline Status rela(unsigned char* view, unsigned int right_shift, typename elfcpp::Valtype_base::Valtype dst_mask, Address value, Overflow_check overflow) { typedef typename elfcpp::Swap::Valtype Valtype; Valtype* wv = reinterpret_cast(view); Valtype val = elfcpp::Swap::readval(wv); Valtype reloc = value >> right_shift; val &= ~dst_mask; reloc &= dst_mask; elfcpp::Swap::writeval(wv, val | reloc); return overflowed(value >> right_shift, overflow); } // Do a simple RELA relocation, unaligned. template static inline Status rela_ua(unsigned char* view, Address value, Overflow_check overflow) { elfcpp::Swap_unaligned::writeval(view, value); return overflowed(value, overflow); } template static inline Status rela_ua(unsigned char* view, unsigned int right_shift, typename elfcpp::Valtype_base::Valtype dst_mask, Address value, Overflow_check overflow) { typedef typename elfcpp::Swap_unaligned::Valtype Valtype; Valtype val = elfcpp::Swap::readval(view); Valtype reloc = value >> right_shift; val &= ~dst_mask; reloc &= dst_mask; elfcpp::Swap_unaligned::writeval(view, val | reloc); return overflowed(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 bool Powerpc_relobj::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(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::shdr_size; this->special_ = ndx; } return Sized_relobj_file::do_find_special_sections(sd); } // Examine .rela.opd to build info about function entry points. template void Powerpc_relobj::scan_opd_relocs( size_t reloc_count, const unsigned char* prelocs, const unsigned char* plocal_syms) { if (size == 64) { typedef typename Reloc_types::Reloc Reltype; const int reloc_size = Reloc_types::reloc_size; const int sym_size = elfcpp::Elf_sizes::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::Elf_WXword r_info = reloc.get_r_info(); unsigned int r_type = elfcpp::elf_r_type(r_info); if (r_type == elfcpp::R_PPC64_ADDR64) { unsigned int r_sym = elfcpp::elf_r_sym(r_info); typename elfcpp::Elf_types::Elf_Addr value; bool is_ordinary; unsigned int shndx; if (r_sym < this->local_symbol_count()) { typename elfcpp::Sym 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 void Powerpc_relobj::do_read_relocs(Read_relocs_data* rd) { Sized_relobj_file::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(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 Object* Target_powerpc::do_make_elf_object( const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr& 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* obj = new Powerpc_relobj(name, input_file, offset, ehdr); obj->setup(); return obj; } else if (et == elfcpp::ET_DYN) { Sized_dynobj* obj = new Sized_dynobj(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 class Output_data_got_powerpc : public Output_data_got { public: typedef typename elfcpp::Elf_types::Elf_Addr Valtype; typedef Output_data_reloc Rela_dyn; Output_data_got_powerpc(Symbol_table* symtab, Layout* layout) : Output_data_got(), 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::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::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::Elf_Off got_base_offset(const Powerpc_relobj* 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::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::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::add_constant(0); Output_data_got::add_constant(0); Output_data_got::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::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 Output_data_got_powerpc* Target_powerpc::got_section(Symbol_table* symtab, Layout* layout) { if (this->got_ == NULL) { gold_assert(symtab != NULL && layout != NULL); this->got_ = new Output_data_got_powerpc(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 typename Target_powerpc::Reloc_section* Target_powerpc::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 class Output_data_plt_powerpc : public Output_section_data_build { public: typedef Output_data_reloc Reloc_section; Output_data_plt_powerpc(Target_powerpc* 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*, 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* 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 void Output_data_plt_powerpc::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 void Output_data_plt_powerpc::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 void Output_data_plt_powerpc::add_local_ifunc_entry( Sized_relobj_file* 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 blr = 0x4e800020; 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_0_1 = 0xe8010000; static const uint32_t ld_0_12 = 0xe80c0000; 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 lfd_0_1 = 0xc8010000; static const uint32_t li_0_0 = 0x38000000; static const uint32_t li_12_0 = 0x39800000; 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 lvx_0_12_0 = 0x7c0c00ce; 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_0_1 = 0xf8010000; static const uint32_t std_0_12 = 0xf80c0000; static const uint32_t std_2_1 = 0xf8410000; static const uint32_t stfd_0_1 = 0xd8010000; static const uint32_t stvx_0_12_0 = 0x7c0c01ce; static const uint32_t sub_11_11_12 = 0x7d6c5850; // Write out the PLT. template void Output_data_plt_powerpc::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* 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 void Target_powerpc::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(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 void Target_powerpc::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(this, iplt_rel, 0, "** IPLT"); this->plt_->output_section()->add_output_section_data(this->iplt_); } } // A class to handle .glink. template class Output_data_glink : public Output_section_data { public: static const int pltresolve_size = 16*4; Output_data_glink(Target_powerpc*); // Add an entry void add_entry(const Sized_relobj_file*, const Symbol*, const elfcpp::Rela&); void add_entry(const Sized_relobj_file*, unsigned int, const elfcpp::Rela&); unsigned int find_entry(const Symbol*) const; unsigned int find_entry(const Sized_relobj_file*, unsigned int) const; unsigned int find_entry(const Sized_relobj_file*, const Symbol*, const elfcpp::Rela&) const; unsigned int find_entry(const Sized_relobj_file*, unsigned int, const elfcpp::Rela&) 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* object, unsigned int locsym_index) : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) { } Glink_sym_ent(const Sized_relobj_file* object, const Symbol* sym, const elfcpp::Rela& 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(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* object, unsigned int locsym_index, const elfcpp::Rela& 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(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* object_; typename elfcpp::Elf_types::Elf_Addr addend_; unsigned int locsym_; }; class Glink_sym_ent_hash { public: size_t operator()(const Glink_sym_ent& ent) const { return (reinterpret_cast(ent.sym_) ^ reinterpret_cast(ent.object_) ^ ent.addend_ ^ ent.locsym_); } }; // Map sym/object/addend to index. typedef Unordered_map 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* targ_; }; // Create the glink section. template Output_data_glink::Output_data_glink( Target_powerpc* 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 void Output_data_glink::add_entry( const Sized_relobj_file* object, const Symbol* gsym, const elfcpp::Rela& 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 void Output_data_glink::add_entry( const Sized_relobj_file* object, unsigned int locsym_index, const elfcpp::Rela& 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 unsigned int Output_data_glink::find_entry( const Sized_relobj_file* object, const Symbol* gsym, const elfcpp::Rela& 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 unsigned int Output_data_glink::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 unsigned int Output_data_glink::find_entry( const Sized_relobj_file* object, unsigned int locsym_index, const elfcpp::Rela& 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 unsigned int Output_data_glink::find_entry( const Sized_relobj_file* 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 void Output_data_glink::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 static inline void write_insn(unsigned char* p, uint32_t v) { elfcpp::Swap<32, big_endian>::writeval(p, v); } // Write out .glink. template void Output_data_glink::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::Elf_Addr Address; static const Address invalid_address = static_cast
(0) - 1; Address plt_base = this->targ_->plt_section()->address(); Address iplt_base = invalid_address; const Output_data_got_powerpc* 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* 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* ppcobj = static_cast *>(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(p, addis_12_2 + ha(pltoff)), p += 4; write_insn(p, std_2_1 + 40), p += 4; write_insn(p, ld_11_12 + l(pltoff)), p += 4; if (ha(pltoff + 16) != ha(pltoff)) { write_insn(p, addi_12_12 + l(pltoff)), p += 4; pltoff = 0; } write_insn(p, mtctr_11), p += 4; write_insn(p, ld_2_12 + l(pltoff + 8)), p += 4; write_insn(p, ld_11_12 + l(pltoff + 16)), p += 4; write_insn(p, bctr), p += 4; } else { write_insn(p, std_2_1 + 40), p += 4; write_insn(p, ld_11_2 + l(pltoff)), p += 4; if (ha(pltoff + 16) != ha(pltoff)) { write_insn(p, addi_2_2 + l(pltoff)), p += 4; pltoff = 0; } write_insn(p, mtctr_11), p += 4; write_insn(p, ld_11_2 + l(pltoff + 16)), p += 4; write_insn(p, ld_2_2 + l(pltoff + 8)), p += 4; write_insn(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(p, mflr_12), p += 4; write_insn(p, bcl_20_31), p += 4; write_insn(p, mflr_11), p += 4; write_insn(p, ld_2_11 + l(-16)), p += 4; write_insn(p, mtlr_12), p += 4; write_insn(p, add_12_2_11), p += 4; write_insn(p, ld_11_12 + 0), p += 4; write_insn(p, ld_2_12 + 8), p += 4; write_insn(p, mtctr_11), p += 4; write_insn(p, ld_11_12 + 16), p += 4; write_insn(p, bctr), p += 4; while (p < oview + this->pltresolve_ + this->pltresolve_size) write_insn(p, nop), p += 4; // Write lazy link call stubs. uint32_t indx = 0; while (p < oview + oview_size) { if (indx < 0x8000) { write_insn(p, li_0_0 + indx), p += 4; } else { write_insn(p, lis_0_0 + hi(indx)), p += 4; write_insn(p, ori_0_0_0 + l(indx)), p += 4; } uint32_t branch_off = this->pltresolve_ + 8 - (p - oview); write_insn(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* 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* object = static_cast *>(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(p + 0, lwz_11_30 + l(pltoff)); write_insn(p + 4, mtctr_11); write_insn(p + 8, bctr); } else { write_insn(p + 0, addis_11_30 + ha(pltoff)); write_insn(p + 4, lwz_11_11 + l(pltoff)); write_insn(p + 8, mtctr_11); write_insn(p + 12, bctr); } } else { write_insn(p + 0, lis_11 + ha(plt_addr)); write_insn(p + 4, lwz_11_11 + l(plt_addr)); write_insn(p + 8, mtctr_11); write_insn(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(p, b + end_p - p), p += 4; while (p < end_p) write_insn(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(p + 0, addis_11_11 + ha(bcl_res0)); write_insn(p + 4, mflr_0); write_insn(p + 8, bcl_20_31); write_insn(p + 12, addi_11_11 + l(bcl_res0)); write_insn(p + 16, mflr_12); write_insn(p + 20, mtlr_0); write_insn(p + 24, sub_11_11_12); Address got_bcl = g_o_t + 4 - (after_bcl_off + this->address()); write_insn(p + 28, addis_12_12 + ha(got_bcl)); if (ha(got_bcl) == ha(got_bcl + 4)) { write_insn(p + 32, lwz_0_12 + l(got_bcl)); write_insn(p + 36, lwz_12_12 + l(got_bcl + 4)); } else { write_insn(p + 32, lwzu_0_12 + l(got_bcl)); write_insn(p + 36, lwz_12_12 + 4); } write_insn(p + 40, mtctr_0); write_insn(p + 44, add_0_11_11); write_insn(p + 48, add_11_0_11); write_insn(p + 52, bctr); write_insn(p + 56, nop); write_insn(p + 60, nop); } else { Address res0 = this->pltresolve_ + this->address(); write_insn(p + 0, lis_12 + ha(g_o_t + 4)); write_insn(p + 4, addis_11_11 + ha(-res0)); if (ha(g_o_t + 4) == ha(g_o_t + 8)) write_insn(p + 8, lwz_0_12 + l(g_o_t + 4)); else write_insn(p + 8, lwzu_0_12 + l(g_o_t + 4)); write_insn(p + 12, addi_11_11 + l(-res0)); write_insn(p + 16, mtctr_0); write_insn(p + 20, add_0_11_11); if (ha(g_o_t + 4) == ha(g_o_t + 8)) write_insn(p + 24, lwz_12_12 + l(g_o_t + 8)); else write_insn(p + 24, lwz_12_12 + 4); write_insn(p + 28, add_11_0_11); write_insn(p + 32, bctr); write_insn(p + 36, nop); write_insn(p + 40, nop); write_insn(p + 44, nop); write_insn(p + 48, nop); write_insn(p + 52, nop); write_insn(p + 56, nop); write_insn(p + 60, nop); } p += 64; } of->write_output_view(off, oview_size, oview); } // A class to handle linker generated save/restore functions. template class Output_data_save_res : public Output_section_data_build { public: Output_data_save_res(Symbol_table* symtab); protected: // Write to a map file. void do_print_to_mapfile(Mapfile* mapfile) const { mapfile->print_output_data(this, _("** save/restore")); } void do_write(Output_file*); private: // The maximum size of save/restore contents. static const unsigned int savres_max = 218*4; void savres_define(Symbol_table* symtab, const char *name, unsigned int lo, unsigned int hi, unsigned char* write_ent(unsigned char*, int), unsigned char* write_tail(unsigned char*, int)); unsigned char *contents_; }; template static unsigned char* savegpr0(unsigned char* p, int r) { uint32_t insn = std_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; write_insn(p, insn); return p + 4; } template static unsigned char* savegpr0_tail(unsigned char* p, int r) { p = savegpr0(p, r); uint32_t insn = std_0_1 + 16; write_insn(p, insn); p = p + 4; write_insn(p, blr); return p + 4; } template static unsigned char* restgpr0(unsigned char* p, int r) { uint32_t insn = ld_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; write_insn(p, insn); return p + 4; } template static unsigned char* restgpr0_tail(unsigned char* p, int r) { uint32_t insn = ld_0_1 + 16; write_insn(p, insn); p = p + 4; p = restgpr0(p, r); write_insn(p, mtlr_0); p = p + 4; if (r == 29) { p = restgpr0(p, 30); p = restgpr0(p, 31); } write_insn(p, blr); return p + 4; } template static unsigned char* savegpr1(unsigned char* p, int r) { uint32_t insn = std_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; write_insn(p, insn); return p + 4; } template static unsigned char* savegpr1_tail(unsigned char* p, int r) { p = savegpr1(p, r); write_insn(p, blr); return p + 4; } template static unsigned char* restgpr1(unsigned char* p, int r) { uint32_t insn = ld_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; write_insn(p, insn); return p + 4; } template static unsigned char* restgpr1_tail(unsigned char* p, int r) { p = restgpr1(p, r); write_insn(p, blr); return p + 4; } template static unsigned char* savefpr(unsigned char* p, int r) { uint32_t insn = stfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; write_insn(p, insn); return p + 4; } template static unsigned char* savefpr0_tail(unsigned char* p, int r) { p = savefpr(p, r); write_insn(p, std_0_1 + 16); p = p + 4; write_insn(p, blr); return p + 4; } template static unsigned char* restfpr(unsigned char* p, int r) { uint32_t insn = lfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; write_insn(p, insn); return p + 4; } template static unsigned char* restfpr0_tail(unsigned char* p, int r) { write_insn(p, ld_0_1 + 16); p = p + 4; p = restfpr(p, r); write_insn(p, mtlr_0); p = p + 4; if (r == 29) { p = restfpr(p, 30); p = restfpr(p, 31); } write_insn(p, blr); return p + 4; } template static unsigned char* savefpr1_tail(unsigned char* p, int r) { p = savefpr(p, r); write_insn(p, blr); return p + 4; } template static unsigned char* restfpr1_tail(unsigned char* p, int r) { p = restfpr(p, r); write_insn(p, blr); return p + 4; } template static unsigned char* savevr(unsigned char* p, int r) { uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; write_insn(p, insn); p = p + 4; insn = stvx_0_12_0 + (r << 21); write_insn(p, insn); return p + 4; } template static unsigned char* savevr_tail(unsigned char* p, int r) { p = savevr(p, r); write_insn(p, blr); return p + 4; } template static unsigned char* restvr(unsigned char* p, int r) { uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; write_insn(p, insn); p = p + 4; insn = lvx_0_12_0 + (r << 21); write_insn(p, insn); return p + 4; } template static unsigned char* restvr_tail(unsigned char* p, int r) { p = restvr(p, r); write_insn(p, blr); return p + 4; } template Output_data_save_res::Output_data_save_res( Symbol_table* symtab) : Output_section_data_build(4), contents_(NULL) { this->savres_define(symtab, "_savegpr0_", 14, 31, savegpr0, savegpr0_tail); this->savres_define(symtab, "_restgpr0_", 14, 29, restgpr0, restgpr0_tail); this->savres_define(symtab, "_restgpr0_", 30, 31, restgpr0, restgpr0_tail); this->savres_define(symtab, "_savegpr1_", 14, 31, savegpr1, savegpr1_tail); this->savres_define(symtab, "_restgpr1_", 14, 31, restgpr1, restgpr1_tail); this->savres_define(symtab, "_savefpr_", 14, 31, savefpr, savefpr0_tail); this->savres_define(symtab, "_restfpr_", 14, 29, restfpr, restfpr0_tail); this->savres_define(symtab, "_restfpr_", 30, 31, restfpr, restfpr0_tail); this->savres_define(symtab, "._savef", 14, 31, savefpr, savefpr1_tail); this->savres_define(symtab, "._restf", 14, 31, restfpr, restfpr1_tail); this->savres_define(symtab, "_savevr_", 20, 31, savevr, savevr_tail); this->savres_define(symtab, "_restvr_", 20, 31, restvr, restvr_tail); } template void Output_data_save_res::savres_define( Symbol_table* symtab, const char *name, unsigned int lo, unsigned int hi, unsigned char* write_ent(unsigned char*, int), unsigned char* write_tail(unsigned char*, int)) { size_t len = strlen(name); bool writing = false; char sym[16]; memcpy(sym, name, len); sym[len + 2] = 0; for (unsigned int i = lo; i <= hi; i++) { sym[len + 0] = i / 10 + '0'; sym[len + 1] = i % 10 + '0'; Symbol* gsym = symtab->lookup(sym); bool refd = gsym != NULL && gsym->is_undefined(); writing = writing || refd; if (writing) { if (this->contents_ == NULL) this->contents_ = new unsigned char[this->savres_max]; off_t value = this->current_data_size(); unsigned char* p = this->contents_ + value; if (i != hi) p = write_ent(p, i); else p = write_tail(p, i); off_t cur_size = p - this->contents_; this->set_current_data_size(cur_size); if (refd) symtab->define_in_output_data(sym, NULL, Symbol_table::PREDEFINED, this, value, cur_size - value, elfcpp::STT_FUNC, elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, false, false); } } } // Write out save/restore. template void Output_data_save_res::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); memcpy(oview, this->contents_, oview_size); of->write_output_view(off, oview_size, oview); } // Create the glink section. template void Target_powerpc::make_glink_section(Layout* layout) { if (this->glink_ == NULL) { this->glink_ = new Output_data_glink(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 void Target_powerpc::make_plt_entry( Layout* layout, Symbol* gsym, const elfcpp::Rela& reloc, const Sized_relobj_file* 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 void Target_powerpc::make_local_ifunc_plt_entry( Layout* layout, const elfcpp::Rela& reloc, Sized_relobj_file* relobj) { if (this->iplt_ == NULL) this->make_iplt_section(layout); unsigned int r_sym = elfcpp::elf_r_sym(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 unsigned int Target_powerpc::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 unsigned int Target_powerpc::first_plt_entry_offset() const { return this->plt_->first_plt_entry_offset(); } // Return the size of each PLT entry. template unsigned int Target_powerpc::plt_entry_size() const { return Output_data_plt_powerpc::get_plt_entry_size(); } // Create a GOT entry for local dynamic __tls_get_addr calls. template unsigned int Target_powerpc::tlsld_got_offset( Symbol_table* symtab, Layout* layout, Sized_relobj_file* 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* 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 Target_powerpc::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 void Target_powerpc::Scan::unsupported_reloc_local( Sized_relobj_file* 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 void Target_powerpc::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 bool Target_powerpc::Scan::reloc_needs_plt_for_ifunc( Sized_relobj_file* 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 inline void Target_powerpc::Scan::local( Symbol_table* symtab, Layout* layout, Target_powerpc* target, Sized_relobj_file* object, unsigned int data_shndx, Output_section* output_section, const elfcpp::Rela& reloc, unsigned int r_type, const elfcpp::Sym& lsym, bool is_discarded) { Powerpc_relobj* ppc_object = static_cast*>(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* 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* 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(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(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* got = target->got_section(symtab, layout); unsigned int r_sym = elfcpp::elf_r_sym(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* got = target->got_section(symtab, layout); unsigned int r_sym = elfcpp::elf_r_sym(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* got = target->got_section(symtab, layout); unsigned int r_sym = elfcpp::elf_r_sym(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* got = target->got_section(symtab, layout); unsigned int r_sym = elfcpp::elf_r_sym(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 void Target_powerpc::Scan::unsupported_reloc_global( Sized_relobj_file* 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 inline void Target_powerpc::Scan::global( Symbol_table* symtab, Layout* layout, Target_powerpc* target, Sized_relobj_file* object, unsigned int data_shndx, Output_section* output_section, const elfcpp::Rela& reloc, unsigned int r_type, Symbol* gsym) { Powerpc_relobj* ppc_object = static_cast*>(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* 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* symobj = ppc_object; if (data_shndx != ppc_object->opd_shndx()) symobj = static_cast *>(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(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(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* 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* 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* 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* 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* 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 void Target_powerpc::gc_process_relocs( Symbol_table* symtab, Layout* layout, Sized_relobj_file* 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 Powerpc; typedef typename Target_powerpc::Scan Scan; Powerpc_relobj* ppc_object = static_cast*>(object); if (size == 64) ppc_object->set_opd_valid(); if (size == 64 && data_shndx == ppc_object->opd_shndx()) { typename Powerpc_relobj::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::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( 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 void Target_powerpc::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* ppc_object = static_cast*>(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 void Target_powerpc::do_gc_mark_symbol( Symbol_table* symtab, Symbol* sym) const { if (size == 64) { Powerpc_relobj* ppc_object = static_cast*>(sym->object()); bool is_ordinary; unsigned int shndx = sym->shndx(&is_ordinary); if (is_ordinary && shndx == ppc_object->opd_shndx()) { Sized_symbol* gsym = symtab->get_sized_symbol(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 void Target_powerpc::scan_relocs( Symbol_table* symtab, Layout* layout, Sized_relobj_file* 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 Powerpc; typedef typename Target_powerpc::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( 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 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*>(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); } }; template void Target_powerpc::define_save_restore_funcs( Layout* layout, Symbol_table* symtab) { if (size == 64) { Output_data_save_res<64, big_endian>* savres = new Output_data_save_res<64, big_endian>(symtab); layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, savres, ORDER_TEXT, false); } } // Finalize the sections. template void Target_powerpc::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 Symbol_visitor; symtab->for_all_symbols<64, Symbol_visitor>(Symbol_visitor()); this->define_save_restore_funcs(layout, symtab); } // 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 typename elfcpp::Elf_types::Elf_Addr Target_powerpc::symval_for_branch( Address value, const Sized_symbol* gsym, Powerpc_relobj* 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* symobj = object; if (gsym != NULL && gsym->source() != Symbol::FROM_OBJECT) return value; if (gsym != NULL) symobj = static_cast*>(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 inline bool Target_powerpc::Relocate::relocate( const Relocate_info* relinfo, Target_powerpc* target, Output_section* os, size_t relnum, const elfcpp::Rela& rela, unsigned int r_type, const Sized_symbol* gsym, const Symbol_value* 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 Reloc; typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn; Powerpc_relobj* const object = static_cast*>(relinfo->object); Address value = 0; bool has_plt_value = false; unsigned int r_sym = elfcpp::elf_r_sym(rela.get_r_info()); if (gsym != NULL ? use_plt_offset(gsym, Scan::get_reference_flags(r_type)) : object->local_has_plt_offset(r_sym)) { const Output_data_glink* 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(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(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(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(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(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(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(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(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(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(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(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(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(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(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(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(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(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(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::Status status = Powerpc_relocate_functions::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::STATUS_OK) gold_error_at_location(relinfo, relnum, rela.get_r_offset(), _("relocation overflow")); return true; } // Relocate section data. template void Target_powerpc::relocate_section( const Relocate_info* 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 Powerpc; typedef typename Target_powerpc::Relocate Powerpc_relocate; gold_assert(sh_type == elfcpp::SHT_RELA); unsigned char *opd_rel = NULL; Powerpc_relobj* const object = static_cast*>(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::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::Reloc reloc(rrel); typename elfcpp::Elf_types::Elf_WXword r_info = reloc.get_r_info(); unsigned int r_type = elfcpp::elf_r_type(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( 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 void Target_powerpc::scan_relocatable_relocs( Symbol_table* symtab, Layout* layout, Sized_relobj_file* 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( 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 void Target_powerpc::relocate_relocs( const Relocate_info* 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::Reloc Reltype; typedef typename Reloc_types::Reloc_write Reltype_write; const int reloc_size = Reloc_types::reloc_size; Powerpc_relobj* const object = static_cast*>(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::Elf_WXword r_info = reloc.get_r_info(); unsigned int r_sym = elfcpp::elf_r_sym(r_info); unsigned int r_type = elfcpp::elf_r_type(r_info); const unsigned int orig_r_sym = r_sym; typename elfcpp::Elf_types::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
(offset_in_output_section) != invalid_address) offset += offset_in_output_section; else { section_offset_type sot_offset = convert_types(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
(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* 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(r_sym, r_type)); reloc_write.put_r_addend(addend); pwrite += reloc_size; } gold_assert(static_cast(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 uint64_t Target_powerpc::do_dynsym_value(const Symbol* gsym) const { if (size == 32) { gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); const Output_data_glink* 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 uint64_t Target_powerpc::do_plt_address_for_local( const Relobj* object, unsigned int symndx) const { if (size == 32) { const Sized_relobj* relobj = static_cast*>(object); const Output_data_glink* 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 uint64_t Target_powerpc::do_plt_address_for_global( const Symbol* gsym) const { if (size == 32) { const Output_data_glink* 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 int64_t Target_powerpc::do_tls_offset_for_local( const Relobj* object, unsigned int symndx, unsigned int got_indx) const { const Powerpc_relobj* ppc_object = static_cast*>(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 int64_t Target_powerpc::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 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(); } }; 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.