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author | Lorry Tar Creator <lorry-tar-importer@baserock.org> | 2014-12-23 14:38:46 +0000 |
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committer | <> | 2015-05-26 15:48:41 +0000 |
commit | 5500a97a2ad1735db5b35bc51cfb825c1f4c38df (patch) | |
tree | cc6e777c26142b88456ff03a672e1cb69215fc32 /gold/powerpc.cc | |
download | binutils-tarball-master.tar.gz |
Imported from /home/lorry/working-area/delta_binutils-tarball/binutils-2.25.tar.bz2.HEADbinutils-2.25master
Diffstat (limited to 'gold/powerpc.cc')
-rw-r--r-- | gold/powerpc.cc | 8305 |
1 files changed, 8305 insertions, 0 deletions
diff --git a/gold/powerpc.cc b/gold/powerpc.cc new file mode 100644 index 0000000..0450937 --- /dev/null +++ b/gold/powerpc.cc @@ -0,0 +1,8305 @@ +// powerpc.cc -- powerpc target support for gold. + +// Copyright (C) 2008-2014 Free Software Foundation, Inc. +// Written by David S. Miller <davem@davemloft.net> +// and David Edelsohn <edelsohn@gnu.org> + +// This file is part of gold. + +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 3 of the License, or +// (at your option) any later version. + +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, +// MA 02110-1301, USA. + +#include "gold.h" + +#include <set> +#include <algorithm> +#include "elfcpp.h" +#include "dwarf.h" +#include "parameters.h" +#include "reloc.h" +#include "powerpc.h" +#include "object.h" +#include "symtab.h" +#include "layout.h" +#include "output.h" +#include "copy-relocs.h" +#include "target.h" +#include "target-reloc.h" +#include "target-select.h" +#include "tls.h" +#include "errors.h" +#include "gc.h" + +namespace +{ + +using namespace gold; + +template<int size, bool big_endian> +class Output_data_plt_powerpc; + +template<int size, bool big_endian> +class Output_data_brlt_powerpc; + +template<int size, bool big_endian> +class Output_data_got_powerpc; + +template<int size, bool big_endian> +class Output_data_glink; + +template<int size, bool big_endian> +class Stub_table; + +inline bool +is_branch_reloc(unsigned int r_type); + +template<int size, bool big_endian> +class Powerpc_relobj : public Sized_relobj_file<size, big_endian> +{ +public: + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + typedef Unordered_set<Section_id, Section_id_hash> Section_refs; + typedef Unordered_map<Address, Section_refs> Access_from; + + Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset, + const typename elfcpp::Ehdr<size, big_endian>& ehdr) + : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), + special_(0), has_small_toc_reloc_(false), opd_valid_(false), + opd_ent_(), access_from_map_(), has14_(), stub_table_(), + e_flags_(ehdr.get_e_flags()), st_other_() + { + this->set_abiversion(0); + } + + ~Powerpc_relobj() + { } + + // Read the symbols then set up st_other vector. + void + do_read_symbols(Read_symbols_data*); + + // 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; + } + + 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); + + // Perform the Sized_relobj_file method, then set up opd info from + // .opd relocs. + void + do_read_relocs(Read_relocs_data*); + + bool + do_find_special_sections(Read_symbols_data* sd); + + // Adjust this local symbol value. Return false if the symbol + // should be discarded from the output file. + bool + do_adjust_local_symbol(Symbol_value<size>* lv) const + { + if (size == 64 && this->opd_shndx() != 0) + { + bool is_ordinary; + if (lv->input_shndx(&is_ordinary) != this->opd_shndx()) + return true; + if (this->get_opd_discard(lv->input_value())) + return false; + } + return true; + } + + Access_from* + access_from_map() + { return &this->access_from_map_; } + + // Add a reference from SRC_OBJ, SRC_INDX to this object's .opd + // section at DST_OFF. + void + add_reference(Object* src_obj, + unsigned int src_indx, + typename elfcpp::Elf_types<size>::Elf_Addr dst_off) + { + Section_id src_id(src_obj, src_indx); + this->access_from_map_[dst_off].insert(src_id); + } + + // Add a reference to the code section specified by the .opd entry + // at DST_OFF + void + add_gc_mark(typename elfcpp::Elf_types<size>::Elf_Addr dst_off) + { + size_t ndx = this->opd_ent_ndx(dst_off); + if (ndx >= this->opd_ent_.size()) + this->opd_ent_.resize(ndx + 1); + this->opd_ent_[ndx].gc_mark = true; + } + + void + process_gc_mark(Symbol_table* symtab) + { + for (size_t i = 0; i < this->opd_ent_.size(); i++) + if (this->opd_ent_[i].gc_mark) + { + unsigned int shndx = this->opd_ent_[i].shndx; + symtab->gc()->worklist().push(Section_id(this, shndx)); + } + } + + // 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; } + + void + set_has_small_toc_reloc() + { has_small_toc_reloc_ = true; } + + bool + has_small_toc_reloc() const + { return has_small_toc_reloc_; } + + void + set_has_14bit_branch(unsigned int shndx) + { + if (shndx >= this->has14_.size()) + this->has14_.resize(shndx + 1); + this->has14_[shndx] = true; + } + + bool + has_14bit_branch(unsigned int shndx) const + { return shndx < this->has14_.size() && this->has14_[shndx]; } + + void + set_stub_table(unsigned int shndx, Stub_table<size, big_endian>* stub_table) + { + if (shndx >= this->stub_table_.size()) + this->stub_table_.resize(shndx + 1); + this->stub_table_[shndx] = stub_table; + } + + Stub_table<size, big_endian>* + stub_table(unsigned int shndx) + { + if (shndx < this->stub_table_.size()) + return this->stub_table_[shndx]; + return NULL; + } + + int + abiversion() const + { return this->e_flags_ & elfcpp::EF_PPC64_ABI; } + + // Set ABI version for input and output + void + set_abiversion(int ver); + + unsigned int + ppc64_local_entry_offset(const Symbol* sym) const + { return elfcpp::ppc64_decode_local_entry(sym->nonvis() >> 3); } + + unsigned int + ppc64_local_entry_offset(unsigned int symndx) const + { return elfcpp::ppc64_decode_local_entry(this->st_other_[symndx] >> 5); } + +private: + struct Opd_ent + { + unsigned int shndx; + bool discard : 1; + bool gc_mark : 1; + Address 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_; + + // For 64-bit, whether this object uses small model relocs to access + // the toc. + bool has_small_toc_reloc_; + + // Set at the start of gc_process_relocs, when we know opd_ent_ + // vector is valid. The flag could be made atomic and set in + // do_read_relocs with memory_order_release and then tested with + // memory_order_acquire, potentially resulting in fewer entries in + // access_from_map_. + bool opd_valid_; + + // The first 8-byte word of an OPD entry gives the address of the + // entry point of the function. Relocatable object files have a + // relocation on this word. The following vector records the + // section and offset specified by these relocations. + std::vector<Opd_ent> opd_ent_; + + // References made to this object's .opd section when running + // gc_process_relocs for another object, before the opd_ent_ vector + // is valid for this object. + Access_from access_from_map_; + + // Whether input section has a 14-bit branch reloc. + std::vector<bool> has14_; + + // The stub table to use for a given input section. + std::vector<Stub_table<size, big_endian>*> stub_table_; + + // Header e_flags + elfcpp::Elf_Word e_flags_; + + // ELF st_other field for local symbols. + std::vector<unsigned char> st_other_; +}; + +template<int size, bool big_endian> +class Powerpc_dynobj : public Sized_dynobj<size, big_endian> +{ +public: + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + + Powerpc_dynobj(const std::string& name, Input_file* input_file, off_t offset, + const typename elfcpp::Ehdr<size, big_endian>& ehdr) + : Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr), + opd_shndx_(0), opd_ent_(), e_flags_(ehdr.get_e_flags()) + { + this->set_abiversion(0); + } + + ~Powerpc_dynobj() + { } + + // Call Sized_dynobj::do_read_symbols to read the symbols then + // read .opd from a dynamic object, filling in opd_ent_ vector, + void + do_read_symbols(Read_symbols_data*); + + // The .opd section shndx. + unsigned int + opd_shndx() const + { + return this->opd_shndx_; + } + + // The .opd section address. + Address + opd_address() const + { + return this->opd_address_; + } + + // 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; + } + + int + abiversion() const + { return this->e_flags_ & elfcpp::EF_PPC64_ABI; } + + // Set ABI version for input and output. + void + set_abiversion(int ver); + +private: + // Used to specify extent of executable sections. + struct Sec_info + { + Sec_info(Address start_, Address len_, unsigned int shndx_) + : start(start_), len(len_), shndx(shndx_) + { } + + bool + operator<(const Sec_info& that) const + { return this->start < that.start; } + + Address start; + Address len; + unsigned int shndx; + }; + + struct Opd_ent + { + unsigned int shndx; + Address off; + }; + + // Return index into opd_ent_ array for .opd entry at OFF. + size_t + opd_ent_ndx(size_t off) const + { return off >> 4;} + + // For 64-bit the .opd section shndx and address. + unsigned int opd_shndx_; + Address opd_address_; + + // The first 8-byte word of an OPD entry gives the address of the + // entry point of the function. Records the section and offset + // corresponding to the address. Note that in dynamic objects, + // offset is *not* relative to the section. + std::vector<Opd_ent> opd_ent_; + + // Header e_flags + elfcpp::Elf_Word e_flags_; +}; + +template<int size, bool big_endian> +class Target_powerpc : public Sized_target<size, big_endian> +{ + public: + typedef + Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section; + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + typedef typename elfcpp::Elf_types<size>::Elf_Swxword Signed_address; + static const Address invalid_address = static_cast<Address>(0) - 1; + // Offset of tp and dtp pointers from start of TLS block. + static const Address tp_offset = 0x7000; + static const Address dtp_offset = 0x8000; + + Target_powerpc() + : Sized_target<size, big_endian>(&powerpc_info), + got_(NULL), plt_(NULL), iplt_(NULL), brlt_section_(NULL), + glink_(NULL), rela_dyn_(NULL), copy_relocs_(elfcpp::R_POWERPC_COPY), + tlsld_got_offset_(-1U), + stub_tables_(), branch_lookup_table_(), branch_info_(), + plt_thread_safe_(false) + { + } + + // Process the relocations to determine unreferenced sections for + // garbage collection. + void + gc_process_relocs(Symbol_table* symtab, + Layout* layout, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols); + + // Scan the relocations to look for symbol adjustments. + void + scan_relocs(Symbol_table* symtab, + Layout* layout, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols); + + // Map input .toc section to output .got section. + const char* + do_output_section_name(const Relobj*, const char* name, size_t* plen) const + { + if (size == 64 && strcmp(name, ".toc") == 0) + { + *plen = 4; + return ".got"; + } + return NULL; + } + + // Provide linker defined save/restore functions. + void + define_save_restore_funcs(Layout*, Symbol_table*); + + // No stubs unless a final link. + bool + do_may_relax() const + { return !parameters->options().relocatable(); } + + bool + do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*); + + void + do_plt_fde_location(const Output_data*, unsigned char*, + uint64_t*, off_t*) const; + + // Stash info about branches, for stub generation. + void + push_branch(Powerpc_relobj<size, big_endian>* ppc_object, + unsigned int data_shndx, Address r_offset, + unsigned int r_type, unsigned int r_sym, Address addend) + { + Branch_info info(ppc_object, data_shndx, r_offset, r_type, r_sym, addend); + this->branch_info_.push_back(info); + if (r_type == elfcpp::R_POWERPC_REL14 + || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN + || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN) + ppc_object->set_has_14bit_branch(data_shndx); + } + + Stub_table<size, big_endian>* + new_stub_table(); + + void + do_define_standard_symbols(Symbol_table*, Layout*); + + // 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; + + void + do_function_location(Symbol_location*) const; + + bool + do_can_check_for_function_pointers() const + { return true; } + + // Relocate a section. + void + relocate_section(const Relocate_info<size, big_endian>*, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + unsigned char* view, + Address view_address, + section_size_type view_size, + const Reloc_symbol_changes*); + + // Scan the relocs during a relocatable link. + void + scan_relocatable_relocs(Symbol_table* symtab, + Layout* layout, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols, + Relocatable_relocs*); + + // Emit relocations for a section. + void + relocate_relocs(const Relocate_info<size, big_endian>*, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + typename elfcpp::Elf_types<size>::Elf_Off + offset_in_output_section, + const Relocatable_relocs*, + unsigned char*, + Address view_address, + section_size_type, + unsigned char* reloc_view, + section_size_type reloc_view_size); + + // Return whether SYM is defined by the ABI. + bool + do_is_defined_by_abi(const Symbol* sym) const + { + return strcmp(sym->name(), "__tls_get_addr") == 0; + } + + // Return the size of the GOT section. + section_size_type + got_size() const + { + gold_assert(this->got_ != NULL); + return this->got_->data_size(); + } + + // Get the PLT section. + const Output_data_plt_powerpc<size, big_endian>* + plt_section() const + { + gold_assert(this->plt_ != NULL); + return this->plt_; + } + + // Get the IPLT section. + const Output_data_plt_powerpc<size, big_endian>* + iplt_section() const + { + gold_assert(this->iplt_ != NULL); + return this->iplt_; + } + + // Get the .glink section. + const Output_data_glink<size, big_endian>* + glink_section() const + { + gold_assert(this->glink_ != NULL); + return this->glink_; + } + + Output_data_glink<size, big_endian>* + glink_section() + { + gold_assert(this->glink_ != NULL); + return this->glink_; + } + + bool has_glink() const + { return this->glink_ != NULL; } + + // Get the GOT section. + const Output_data_got_powerpc<size, big_endian>* + got_section() const + { + gold_assert(this->got_ != NULL); + return this->got_; + } + + // Get the GOT section, creating it if necessary. + Output_data_got_powerpc<size, big_endian>* + got_section(Symbol_table*, Layout*); + + Object* + do_make_elf_object(const std::string&, Input_file*, off_t, + const elfcpp::Ehdr<size, big_endian>&); + + // Return the number of entries in the GOT. + unsigned int + got_entry_count() const + { + if (this->got_ == NULL) + return 0; + return this->got_size() / (size / 8); + } + + // Return the number of entries in the PLT. + unsigned int + plt_entry_count() const; + + // Return the offset of the first non-reserved PLT entry. + unsigned int + first_plt_entry_offset() const + { + if (size == 32) + return 0; + if (this->abiversion() >= 2) + return 16; + return 24; + } + + // Return the size of each PLT entry. + unsigned int + plt_entry_size() const + { + if (size == 32) + return 4; + if (this->abiversion() >= 2) + return 8; + return 24; + } + + // 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; + + typedef std::vector<Stub_table<size, big_endian>*> Stub_tables; + const Stub_tables& + stub_tables() const + { return this->stub_tables_; } + + const Output_data_brlt_powerpc<size, big_endian>* + brlt_section() const + { return this->brlt_section_; } + + void + add_branch_lookup_table(Address to) + { + unsigned int off = this->branch_lookup_table_.size() * (size / 8); + this->branch_lookup_table_.insert(std::make_pair(to, off)); + } + + Address + find_branch_lookup_table(Address to) + { + typename Branch_lookup_table::const_iterator p + = this->branch_lookup_table_.find(to); + return p == this->branch_lookup_table_.end() ? invalid_address : p->second; + } + + void + write_branch_lookup_table(unsigned char *oview) + { + for (typename Branch_lookup_table::const_iterator p + = this->branch_lookup_table_.begin(); + p != this->branch_lookup_table_.end(); + ++p) + { + elfcpp::Swap<size, big_endian>::writeval(oview + p->second, p->first); + } + } + + bool + plt_thread_safe() const + { return this->plt_thread_safe_; } + + int + abiversion () const + { return this->processor_specific_flags() & elfcpp::EF_PPC64_ABI; } + + void + set_abiversion (int ver) + { + elfcpp::Elf_Word flags = this->processor_specific_flags(); + flags &= ~elfcpp::EF_PPC64_ABI; + flags |= ver & elfcpp::EF_PPC64_ABI; + this->set_processor_specific_flags(flags); + } + + // Offset to to save stack slot + int + stk_toc () const + { return this->abiversion() < 2 ? 40 : 24; } + + private: + + class Track_tls + { + public: + enum Tls_get_addr + { + NOT_EXPECTED = 0, + EXPECTED = 1, + SKIP = 2, + NORMAL = 3 + }; + + Track_tls() + : tls_get_addr_(NOT_EXPECTED), + relinfo_(NULL), relnum_(0), r_offset_(0) + { } + + ~Track_tls() + { + if (this->tls_get_addr_ != NOT_EXPECTED) + this->missing(); + } + + void + missing(void) + { + if (this->relinfo_ != NULL) + gold_error_at_location(this->relinfo_, this->relnum_, this->r_offset_, + _("missing expected __tls_get_addr call")); + } + + void + expect_tls_get_addr_call( + const Relocate_info<size, big_endian>* relinfo, + size_t relnum, + Address r_offset) + { + this->tls_get_addr_ = EXPECTED; + this->relinfo_ = relinfo; + this->relnum_ = relnum; + this->r_offset_ = r_offset; + } + + void + expect_tls_get_addr_call() + { this->tls_get_addr_ = EXPECTED; } + + void + skip_next_tls_get_addr_call() + {this->tls_get_addr_ = SKIP; } + + Tls_get_addr + maybe_skip_tls_get_addr_call(unsigned int r_type, const Symbol* gsym) + { + 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); + Tls_get_addr last_tls = this->tls_get_addr_; + this->tls_get_addr_ = NOT_EXPECTED; + if (is_tls_call && last_tls != EXPECTED) + return last_tls; + else if (!is_tls_call && last_tls != NOT_EXPECTED) + { + this->missing(); + return EXPECTED; + } + return NORMAL; + } + + private: + // What we're up to regarding calls to __tls_get_addr. + // On powerpc, the branch and link insn making a call to + // __tls_get_addr is marked with a relocation, R_PPC64_TLSGD, + // R_PPC64_TLSLD, R_PPC_TLSGD or R_PPC_TLSLD, in addition to the + // usual R_POWERPC_REL24 or R_PPC_PLTREL25 relocation on a call. + // The marker relocation always comes first, and has the same + // symbol as the reloc on the insn setting up the __tls_get_addr + // argument. This ties the arg setup insn with the call insn, + // allowing ld to safely optimize away the call. We check that + // every call to __tls_get_addr has a marker relocation, and that + // every marker relocation is on a call to __tls_get_addr. + Tls_get_addr tls_get_addr_; + // Info about the last reloc for error message. + const Relocate_info<size, big_endian>* relinfo_; + size_t relnum_; + Address r_offset_; + }; + + // The class which scans relocations. + class Scan : protected Track_tls + { + public: + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + + Scan() + : Track_tls(), issued_non_pic_error_(false) + { } + + static inline int + get_reference_flags(unsigned int r_type, const Target_powerpc* target); + + inline void + local(Symbol_table* symtab, Layout* layout, Target_powerpc* target, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, + const elfcpp::Sym<size, big_endian>& lsym, + bool is_discarded); + + inline void + global(Symbol_table* symtab, Layout* layout, Target_powerpc* target, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, + Symbol* gsym); + + inline bool + local_reloc_may_be_function_pointer(Symbol_table* , Layout* , + Target_powerpc* , + Sized_relobj_file<size, big_endian>* relobj, + unsigned int , + Output_section* , + const elfcpp::Rela<size, big_endian>& , + unsigned int r_type, + const elfcpp::Sym<size, big_endian>&) + { + // PowerPC64 .opd is not folded, so any identical function text + // may be folded and we'll still keep function addresses distinct. + // That means no reloc is of concern here. + if (size == 64) + { + Powerpc_relobj<size, big_endian>* ppcobj = static_cast + <Powerpc_relobj<size, big_endian>*>(relobj); + if (ppcobj->abiversion() == 1) + return false; + } + // For 32-bit and ELFv2, conservatively assume anything but calls to + // function code might be taking the address of the function. + return !is_branch_reloc(r_type); + } + + inline bool + global_reloc_may_be_function_pointer(Symbol_table* , Layout* , + Target_powerpc* , + Sized_relobj_file<size, big_endian>* relobj, + unsigned int , + Output_section* , + const elfcpp::Rela<size, big_endian>& , + unsigned int r_type, + Symbol*) + { + // As above. + if (size == 64) + { + Powerpc_relobj<size, big_endian>* ppcobj = static_cast + <Powerpc_relobj<size, big_endian>*>(relobj); + if (ppcobj->abiversion() == 1) + return false; + } + return !is_branch_reloc(r_type); + } + + static bool + reloc_needs_plt_for_ifunc(Target_powerpc<size, big_endian>* target, + Sized_relobj_file<size, big_endian>* object, + unsigned int r_type, bool report_err); + + private: + static void + unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, + unsigned int r_type); + + static void + unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, + unsigned int r_type, Symbol*); + + static void + generate_tls_call(Symbol_table* symtab, Layout* layout, + Target_powerpc* target); + + void + check_non_pic(Relobj*, unsigned int r_type); + + // Whether we have issued an error about a non-PIC compilation. + bool issued_non_pic_error_; + }; + + bool + symval_for_branch(const Symbol_table* symtab, + const Sized_symbol<size>* gsym, + Powerpc_relobj<size, big_endian>* object, + Address *value, unsigned int *dest_shndx); + + // The class which implements relocation. + class Relocate : protected Track_tls + { + public: + // Use 'at' branch hints when true, 'y' when false. + // FIXME maybe: set this with an option. + static const bool is_isa_v2 = true; + + Relocate() + : Track_tls() + { } + + // Do a relocation. Return false if the caller should not issue + // any warnings about this relocation. + inline bool + relocate(const Relocate_info<size, big_endian>*, Target_powerpc*, + Output_section*, size_t relnum, + const elfcpp::Rela<size, big_endian>&, + unsigned int r_type, const Sized_symbol<size>*, + const Symbol_value<size>*, + unsigned char*, + typename elfcpp::Elf_types<size>::Elf_Addr, + section_size_type); + }; + + class Relocate_comdat_behavior + { + public: + // Decide what the linker should do for relocations that refer to + // discarded comdat sections. + inline Comdat_behavior + get(const char* name) + { + gold::Default_comdat_behavior default_behavior; + Comdat_behavior ret = default_behavior.get(name); + if (ret == CB_WARNING) + { + if (size == 32 + && (strcmp(name, ".fixup") == 0 + || strcmp(name, ".got2") == 0)) + ret = CB_IGNORE; + if (size == 64 + && (strcmp(name, ".opd") == 0 + || strcmp(name, ".toc") == 0 + || strcmp(name, ".toc1") == 0)) + ret = CB_IGNORE; + } + return ret; + } + }; + + // 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; + } + + // Create glink. + void + make_glink_section(Layout*); + + // Create the PLT section. + void + make_plt_section(Symbol_table*, Layout*); + + void + make_iplt_section(Symbol_table*, Layout*); + + void + make_brlt_section(Layout*); + + // Create a PLT entry for a global symbol. + void + make_plt_entry(Symbol_table*, Layout*, Symbol*); + + // Create a PLT entry for a local IFUNC symbol. + void + make_local_ifunc_plt_entry(Symbol_table*, Layout*, + Sized_relobj_file<size, big_endian>*, + unsigned int); + + + // Create a GOT entry for local dynamic __tls_get_addr. + unsigned int + tlsld_got_offset(Symbol_table* symtab, Layout* layout, + Sized_relobj_file<size, big_endian>* object); + + unsigned int + tlsld_got_offset() const + { + return this->tlsld_got_offset_; + } + + // Get the dynamic reloc section, creating it if necessary. + Reloc_section* + rela_dyn_section(Layout*); + + // Similarly, but for ifunc symbols get the one for ifunc. + Reloc_section* + rela_dyn_section(Symbol_table*, Layout*, bool for_ifunc); + + // Copy a relocation against a global symbol. + void + copy_reloc(Symbol_table* symtab, Layout* layout, + Sized_relobj_file<size, big_endian>* object, + unsigned int shndx, Output_section* output_section, + Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) + { + this->copy_relocs_.copy_reloc(symtab, layout, + symtab->get_sized_symbol<size>(sym), + object, shndx, output_section, + reloc, this->rela_dyn_section(layout)); + } + + // Look over all the input sections, deciding where to place stubs. + void + group_sections(Layout*, const Task*); + + // Sort output sections by address. + struct Sort_sections + { + bool + operator()(const Output_section* sec1, const Output_section* sec2) + { return sec1->address() < sec2->address(); } + }; + + class Branch_info + { + public: + Branch_info(Powerpc_relobj<size, big_endian>* ppc_object, + unsigned int data_shndx, + Address r_offset, + unsigned int r_type, + unsigned int r_sym, + Address addend) + : object_(ppc_object), shndx_(data_shndx), offset_(r_offset), + r_type_(r_type), r_sym_(r_sym), addend_(addend) + { } + + ~Branch_info() + { } + + // If this branch needs a plt call stub, or a long branch stub, make one. + void + make_stub(Stub_table<size, big_endian>*, + Stub_table<size, big_endian>*, + Symbol_table*) const; + + private: + // The branch location.. + Powerpc_relobj<size, big_endian>* object_; + unsigned int shndx_; + Address offset_; + // ..and the branch type and destination. + unsigned int r_type_; + unsigned int r_sym_; + Address addend_; + }; + + // 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 section. + Output_data_got_powerpc<size, big_endian>* got_; + // The PLT section. This is a container for a table of addresses, + // and their relocations. Each address in the PLT has a dynamic + // relocation (R_*_JMP_SLOT) and each address will have a + // corresponding entry in .glink for lazy resolution of the PLT. + // ppc32 initialises the PLT to point at the .glink entry, while + // ppc64 leaves this to ld.so. To make a call via the PLT, the + // linker adds a stub that loads the PLT entry into ctr then + // branches to ctr. There may be more than one stub for each PLT + // entry. DT_JMPREL points at the first PLT dynamic relocation and + // DT_PLTRELSZ gives the total size of PLT dynamic relocations. + Output_data_plt_powerpc<size, big_endian>* plt_; + // The IPLT section. Like plt_, this is a container for a table of + // addresses and their relocations, specifically for STT_GNU_IFUNC + // functions that resolve locally (STT_GNU_IFUNC functions that + // don't resolve locally go in PLT). Unlike plt_, these have no + // entry in .glink for lazy resolution, and the relocation section + // does not have a 1-1 correspondence with IPLT addresses. In fact, + // the relocation section may contain relocations against + // STT_GNU_IFUNC symbols at locations outside of IPLT. The + // relocation section will appear at the end of other dynamic + // relocations, so that ld.so applies these relocations after other + // dynamic relocations. In a static executable, the relocation + // section is emitted and marked with __rela_iplt_start and + // __rela_iplt_end symbols. + Output_data_plt_powerpc<size, big_endian>* iplt_; + // Section holding long branch destinations. + Output_data_brlt_powerpc<size, big_endian>* brlt_section_; + // The .glink section. + Output_data_glink<size, big_endian>* glink_; + // The dynamic reloc section. + Reloc_section* rela_dyn_; + // Relocs saved to avoid a COPY reloc. + Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; + // Offset of the GOT entry for local dynamic __tls_get_addr calls. + unsigned int tlsld_got_offset_; + + Stub_tables stub_tables_; + typedef Unordered_map<Address, unsigned int> Branch_lookup_table; + Branch_lookup_table branch_lookup_table_; + + typedef std::vector<Branch_info> Branches; + Branches branch_info_; + + bool plt_thread_safe_; +}; + +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 + "_start" // entry_symbol_name +}; + +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 + "_start" // entry_symbol_name +}; + +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 + "_start" // entry_symbol_name +}; + +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 + "_start" // entry_symbol_name +}; + +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; +} + + +template<int size, bool big_endian> +class Powerpc_relocate_functions +{ +public: + enum Overflow_check + { + CHECK_NONE, + CHECK_SIGNED, + CHECK_UNSIGNED, + CHECK_BITFIELD, + CHECK_LOW_INSN, + CHECK_HIGH_INSN + }; + + enum Status + { + STATUS_OK, + STATUS_OVERFLOW + }; + +private: + typedef Powerpc_relocate_functions<size, big_endian> This; + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + + template<int valsize> + static inline bool + has_overflow_signed(Address value) + { + // limit = 1 << (valsize - 1) without shift count exceeding size of type + Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); + limit <<= ((valsize - 1) >> 1); + limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); + return value + limit > (limit << 1) - 1; + } + + template<int valsize> + static inline bool + has_overflow_unsigned(Address value) + { + Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); + limit <<= ((valsize - 1) >> 1); + limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); + return value > (limit << 1) - 1; + } + + template<int valsize> + static inline bool + has_overflow_bitfield(Address value) + { + return (has_overflow_unsigned<valsize>(value) + && has_overflow_signed<valsize>(value)); + } + + template<int valsize> + static inline Status + overflowed(Address value, Overflow_check overflow) + { + if (overflow == CHECK_SIGNED) + { + if (has_overflow_signed<valsize>(value)) + return STATUS_OVERFLOW; + } + else if (overflow == CHECK_UNSIGNED) + { + if (has_overflow_unsigned<valsize>(value)) + return STATUS_OVERFLOW; + } + else if (overflow == CHECK_BITFIELD) + { + if (has_overflow_bitfield<valsize>(value)) + return STATUS_OVERFLOW; + } + return STATUS_OK; + } + + // Do a simple RELA relocation + template<int fieldsize, int valsize> + static inline Status + rela(unsigned char* view, Address value, Overflow_check overflow) + { + typedef typename elfcpp::Swap<fieldsize, big_endian>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + elfcpp::Swap<fieldsize, big_endian>::writeval(wv, value); + return overflowed<valsize>(value, overflow); + } + + template<int fieldsize, int valsize> + static inline Status + rela(unsigned char* view, + unsigned int right_shift, + typename elfcpp::Valtype_base<fieldsize>::Valtype dst_mask, + Address value, + Overflow_check overflow) + { + typedef typename elfcpp::Swap<fieldsize, big_endian>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + Valtype val = elfcpp::Swap<fieldsize, big_endian>::readval(wv); + Valtype reloc = value >> right_shift; + val &= ~dst_mask; + reloc &= dst_mask; + elfcpp::Swap<fieldsize, big_endian>::writeval(wv, val | reloc); + return overflowed<valsize>(value >> right_shift, overflow); + } + + // Do a simple RELA relocation, unaligned. + template<int fieldsize, int valsize> + static inline Status + rela_ua(unsigned char* view, Address value, Overflow_check overflow) + { + elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, value); + return overflowed<valsize>(value, overflow); + } + + template<int fieldsize, int valsize> + static inline Status + rela_ua(unsigned char* view, + unsigned int right_shift, + typename elfcpp::Valtype_base<fieldsize>::Valtype dst_mask, + Address value, + Overflow_check overflow) + { + typedef typename elfcpp::Swap_unaligned<fieldsize, big_endian>::Valtype + Valtype; + Valtype val = elfcpp::Swap<fieldsize, big_endian>::readval(view); + Valtype reloc = value >> right_shift; + val &= ~dst_mask; + reloc &= dst_mask; + elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, val | reloc); + return overflowed<valsize>(value >> right_shift, overflow); + } + +public: + // R_PPC64_ADDR64: (Symbol + Addend) + static inline void + addr64(unsigned char* view, Address value) + { This::template rela<64,64>(view, value, CHECK_NONE); } + + // R_PPC64_UADDR64: (Symbol + Addend) unaligned + static inline void + addr64_u(unsigned char* view, Address value) + { This::template rela_ua<64,64>(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<32,32>(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<32,32>(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<32,26>(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<16,16>(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<16,16>(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<16,16>(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<16,16>(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<16,16>(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<16,16>(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<32,16>(view, 0, 0xfffc, value, overflow); + if (overflow != CHECK_NONE && (value & 3) != 0) + stat = STATUS_OVERFLOW; + return stat; + } +}; + +// Set ABI version for input and output. + +template<int size, bool big_endian> +void +Powerpc_relobj<size, big_endian>::set_abiversion(int ver) +{ + this->e_flags_ |= ver; + if (this->abiversion() != 0) + { + Target_powerpc<size, big_endian>* target = + static_cast<Target_powerpc<size, big_endian>*>( + parameters->sized_target<size, big_endian>()); + if (target->abiversion() == 0) + target->set_abiversion(this->abiversion()); + else if (target->abiversion() != this->abiversion()) + gold_error(_("%s: ABI version %d is not compatible " + "with ABI version %d output"), + this->name().c_str(), + this->abiversion(), target->abiversion()); + + } +} + +// Stash away the index of .got2 or .opd in a relocatable object, if +// such a section exists. + +template<int size, bool big_endian> +bool +Powerpc_relobj<size, big_endian>::do_find_special_sections( + Read_symbols_data* sd) +{ + const unsigned char* const pshdrs = sd->section_headers->data(); + const unsigned char* namesu = sd->section_names->data(); + const char* names = reinterpret_cast<const char*>(namesu); + section_size_type names_size = sd->section_names_size; + const unsigned char* s; + + s = this->template find_shdr<size, big_endian>(pshdrs, + size == 32 ? ".got2" : ".opd", + names, names_size, NULL); + if (s != NULL) + { + unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size; + this->special_ = ndx; + if (size == 64) + { + if (this->abiversion() == 0) + this->set_abiversion(1); + else if (this->abiversion() > 1) + gold_error(_("%s: .opd invalid in abiv%d"), + this->name().c_str(), this->abiversion()); + } + } + return Sized_relobj_file<size, big_endian>::do_find_special_sections(sd); +} + +// Examine .rela.opd to build info about function entry points. + +template<int size, bool big_endian> +void +Powerpc_relobj<size, big_endian>::scan_opd_relocs( + size_t reloc_count, + const unsigned char* prelocs, + const unsigned char* plocal_syms) +{ + if (size == 64) + { + typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc + Reltype; + const int reloc_size + = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; + const int sym_size = elfcpp::Elf_sizes<size>::sym_size; + Address expected_off = 0; + bool regular = true; + unsigned int opd_ent_size = 0; + + for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) + { + Reltype reloc(prelocs); + typename elfcpp::Elf_types<size>::Elf_WXword r_info + = reloc.get_r_info(); + unsigned int r_type = elfcpp::elf_r_type<size>(r_info); + if (r_type == elfcpp::R_PPC64_ADDR64) + { + unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); + typename elfcpp::Elf_types<size>::Elf_Addr value; + bool is_ordinary; + unsigned int shndx; + if (r_sym < this->local_symbol_count()) + { + typename elfcpp::Sym<size, big_endian> + lsym(plocal_syms + r_sym * sym_size); + shndx = lsym.get_st_shndx(); + shndx = this->adjust_sym_shndx(r_sym, shndx, &is_ordinary); + value = lsym.get_st_value(); + } + else + shndx = this->symbol_section_and_value(r_sym, &value, + &is_ordinary); + this->set_opd_ent(reloc.get_r_offset(), shndx, + value + reloc.get_r_addend()); + if (i == 2) + { + expected_off = reloc.get_r_offset(); + opd_ent_size = expected_off; + } + else if (expected_off != reloc.get_r_offset()) + regular = false; + expected_off += opd_ent_size; + } + else if (r_type == elfcpp::R_PPC64_TOC) + { + if (expected_off - opd_ent_size + 8 != reloc.get_r_offset()) + regular = false; + } + else + { + gold_warning(_("%s: unexpected reloc type %u in .opd section"), + this->name().c_str(), r_type); + regular = false; + } + } + if (reloc_count <= 2) + opd_ent_size = this->section_size(this->opd_shndx()); + if (opd_ent_size != 24 && opd_ent_size != 16) + regular = false; + if (!regular) + { + gold_warning(_("%s: .opd is not a regular array of opd entries"), + this->name().c_str()); + opd_ent_size = 0; + } + } +} + +template<int size, bool big_endian> +void +Powerpc_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd) +{ + Sized_relobj_file<size, big_endian>::do_read_relocs(rd); + if (size == 64) + { + for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); + p != rd->relocs.end(); + ++p) + { + if (p->data_shndx == this->opd_shndx()) + { + uint64_t opd_size = this->section_size(this->opd_shndx()); + gold_assert(opd_size == static_cast<size_t>(opd_size)); + if (opd_size != 0) + { + this->init_opd(opd_size); + this->scan_opd_relocs(p->reloc_count, p->contents->data(), + rd->local_symbols->data()); + } + break; + } + } + } +} + +// Read the symbols then set up st_other vector. + +template<int size, bool big_endian> +void +Powerpc_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) +{ + this->base_read_symbols(sd); + if (size == 64) + { + const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; + const unsigned char* const pshdrs = sd->section_headers->data(); + const unsigned int loccount = this->do_local_symbol_count(); + if (loccount != 0) + { + this->st_other_.resize(loccount); + const int sym_size = elfcpp::Elf_sizes<size>::sym_size; + off_t locsize = loccount * sym_size; + const unsigned int symtab_shndx = this->symtab_shndx(); + const unsigned char *psymtab = pshdrs + symtab_shndx * shdr_size; + typename elfcpp::Shdr<size, big_endian> shdr(psymtab); + const unsigned char* psyms = this->get_view(shdr.get_sh_offset(), + locsize, true, false); + psyms += sym_size; + for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) + { + elfcpp::Sym<size, big_endian> sym(psyms); + unsigned char st_other = sym.get_st_other(); + this->st_other_[i] = st_other; + if ((st_other & elfcpp::STO_PPC64_LOCAL_MASK) != 0) + { + if (this->abiversion() == 0) + this->set_abiversion(2); + else if (this->abiversion() < 2) + gold_error(_("%s: local symbol %d has invalid st_other" + " for ABI version 1"), + this->name().c_str(), i); + } + } + } + } +} + +template<int size, bool big_endian> +void +Powerpc_dynobj<size, big_endian>::set_abiversion(int ver) +{ + this->e_flags_ |= ver; + if (this->abiversion() != 0) + { + Target_powerpc<size, big_endian>* target = + static_cast<Target_powerpc<size, big_endian>*>( + parameters->sized_target<size, big_endian>()); + if (target->abiversion() == 0) + target->set_abiversion(this->abiversion()); + else if (target->abiversion() != this->abiversion()) + gold_error(_("%s: ABI version %d is not compatible " + "with ABI version %d output"), + this->name().c_str(), + this->abiversion(), target->abiversion()); + + } +} + +// Call Sized_dynobj::base_read_symbols to read the symbols then +// read .opd from a dynamic object, filling in opd_ent_ vector, + +template<int size, bool big_endian> +void +Powerpc_dynobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) +{ + this->base_read_symbols(sd); + if (size == 64) + { + const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; + const unsigned char* const pshdrs = sd->section_headers->data(); + const unsigned char* namesu = sd->section_names->data(); + const char* names = reinterpret_cast<const char*>(namesu); + const unsigned char* s = NULL; + const unsigned char* opd; + section_size_type opd_size; + + // Find and read .opd section. + while (1) + { + s = this->template find_shdr<size, big_endian>(pshdrs, ".opd", names, + sd->section_names_size, + s); + if (s == NULL) + return; + + typename elfcpp::Shdr<size, big_endian> shdr(s); + if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS + && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) + { + if (this->abiversion() == 0) + this->set_abiversion(1); + else if (this->abiversion() > 1) + gold_error(_("%s: .opd invalid in abiv%d"), + this->name().c_str(), this->abiversion()); + + this->opd_shndx_ = (s - pshdrs) / shdr_size; + this->opd_address_ = shdr.get_sh_addr(); + opd_size = convert_to_section_size_type(shdr.get_sh_size()); + opd = this->get_view(shdr.get_sh_offset(), opd_size, + true, false); + break; + } + } + + // Build set of executable sections. + // Using a set is probably overkill. There is likely to be only + // a few executable sections, typically .init, .text and .fini, + // and they are generally grouped together. + typedef std::set<Sec_info> Exec_sections; + Exec_sections exec_sections; + s = pshdrs; + for (unsigned int i = 1; i < this->shnum(); ++i, s += shdr_size) + { + typename elfcpp::Shdr<size, big_endian> shdr(s); + if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS + && ((shdr.get_sh_flags() + & (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) + == (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) + && shdr.get_sh_size() != 0) + { + exec_sections.insert(Sec_info(shdr.get_sh_addr(), + shdr.get_sh_size(), i)); + } + } + if (exec_sections.empty()) + return; + + // Look over the OPD entries. This is complicated by the fact + // that some binaries will use two-word entries while others + // will use the standard three-word entries. In most cases + // the third word (the environment pointer for languages like + // Pascal) is unused and will be zero. If the third word is + // used it should not be pointing into executable sections, + // I think. + this->init_opd(opd_size); + for (const unsigned char* p = opd; p < opd + opd_size; p += 8) + { + typedef typename elfcpp::Swap<64, big_endian>::Valtype Valtype; + const Valtype* valp = reinterpret_cast<const Valtype*>(p); + Valtype val = elfcpp::Swap<64, big_endian>::readval(valp); + if (val == 0) + // Chances are that this is the third word of an OPD entry. + continue; + typename Exec_sections::const_iterator e + = exec_sections.upper_bound(Sec_info(val, 0, 0)); + if (e != exec_sections.begin()) + { + --e; + if (e->start <= val && val < e->start + e->len) + { + // We have an address in an executable section. + // VAL ought to be the function entry, set it up. + this->set_opd_ent(p - opd, e->shndx, val); + // Skip second word of OPD entry, the TOC pointer. + p += 8; + } + } + // If we didn't match any executable sections, we likely + // have a non-zero third word in the OPD entry. + } + } +} + +// Set up some symbols. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::do_define_standard_symbols( + Symbol_table* symtab, + Layout* layout) +{ + if (size == 32) + { + // Define _GLOBAL_OFFSET_TABLE_ to ensure it isn't seen as + // undefined when scanning relocs (and thus requires + // non-relative dynamic relocs). The proper value will be + // updated later. + Symbol *gotsym = symtab->lookup("_GLOBAL_OFFSET_TABLE_", NULL); + if (gotsym != NULL && gotsym->is_undefined()) + { + Target_powerpc<size, big_endian>* target = + static_cast<Target_powerpc<size, big_endian>*>( + parameters->sized_target<size, big_endian>()); + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, + Symbol_table::PREDEFINED, + got, 0, 0, + elfcpp::STT_OBJECT, + elfcpp::STB_LOCAL, + elfcpp::STV_HIDDEN, 0, + false, false); + } + + // Define _SDA_BASE_ at the start of the .sdata section + 32768. + Symbol *sdasym = symtab->lookup("_SDA_BASE_", NULL); + if (sdasym != NULL && sdasym->is_undefined()) + { + Output_data_space* 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); + } + } + else + { + // Define .TOC. as for 32-bit _GLOBAL_OFFSET_TABLE_ + Symbol *gotsym = symtab->lookup(".TOC.", NULL); + if (gotsym != NULL && gotsym->is_undefined()) + { + Target_powerpc<size, big_endian>* target = + static_cast<Target_powerpc<size, big_endian>*>( + parameters->sized_target<size, big_endian>()); + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + symtab->define_in_output_data(".TOC.", NULL, + Symbol_table::PREDEFINED, + got, 0x8000, 0, + elfcpp::STT_OBJECT, + elfcpp::STB_LOCAL, + elfcpp::STV_HIDDEN, 0, + false, false); + } + } +} + +// Set up PowerPC target specific relobj. + +template<int size, bool big_endian> +Object* +Target_powerpc<size, big_endian>::do_make_elf_object( + const std::string& name, + Input_file* input_file, + off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) +{ + int et = ehdr.get_e_type(); + // ET_EXEC files are valid input for --just-symbols/-R, + // and we treat them as relocatable objects. + if (et == elfcpp::ET_REL + || (et == elfcpp::ET_EXEC && input_file->just_symbols())) + { + Powerpc_relobj<size, big_endian>* obj = + new Powerpc_relobj<size, big_endian>(name, input_file, offset, ehdr); + obj->setup(); + return obj; + } + else if (et == elfcpp::ET_DYN) + { + Powerpc_dynobj<size, big_endian>* obj = + new Powerpc_dynobj<size, big_endian>(name, input_file, offset, ehdr); + obj->setup(); + return obj; + } + else + { + gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et); + return NULL; + } +} + +template<int size, bool big_endian> +class Output_data_got_powerpc : public Output_data_got<size, big_endian> +{ +public: + typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; + typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn; + + Output_data_got_powerpc(Symbol_table* symtab, Layout* layout) + : Output_data_got<size, big_endian>(), + symtab_(symtab), layout_(layout), + header_ent_cnt_(size == 32 ? 3 : 1), + header_index_(size == 32 ? 0x2000 : 0) + { } + + // Override all the Output_data_got methods we use so as to first call + // reserve_ent(). + bool + add_global(Symbol* gsym, unsigned int got_type) + { + this->reserve_ent(); + return Output_data_got<size, big_endian>::add_global(gsym, got_type); + } + + bool + add_global_plt(Symbol* gsym, unsigned int got_type) + { + this->reserve_ent(); + return Output_data_got<size, big_endian>::add_global_plt(gsym, got_type); + } + + bool + add_global_tls(Symbol* gsym, unsigned int got_type) + { return this->add_global_plt(gsym, got_type); } + + void + add_global_with_rel(Symbol* gsym, unsigned int got_type, + Output_data_reloc_generic* rel_dyn, unsigned int r_type) + { + this->reserve_ent(); + Output_data_got<size, big_endian>:: + add_global_with_rel(gsym, got_type, rel_dyn, r_type); + } + + void + add_global_pair_with_rel(Symbol* gsym, unsigned int got_type, + Output_data_reloc_generic* rel_dyn, + unsigned int r_type_1, unsigned int r_type_2) + { + this->reserve_ent(2); + Output_data_got<size, big_endian>:: + add_global_pair_with_rel(gsym, got_type, rel_dyn, r_type_1, r_type_2); + } + + bool + add_local(Relobj* object, unsigned int sym_index, unsigned int got_type) + { + this->reserve_ent(); + return Output_data_got<size, big_endian>::add_local(object, sym_index, + got_type); + } + + bool + add_local_plt(Relobj* object, unsigned int sym_index, unsigned int got_type) + { + this->reserve_ent(); + return Output_data_got<size, big_endian>::add_local_plt(object, sym_index, + got_type); + } + + bool + add_local_tls(Relobj* object, unsigned int sym_index, unsigned int got_type) + { return this->add_local_plt(object, sym_index, got_type); } + + void + add_local_tls_pair(Relobj* object, unsigned int sym_index, + unsigned int got_type, + Output_data_reloc_generic* rel_dyn, + unsigned int r_type) + { + this->reserve_ent(2); + Output_data_got<size, big_endian>:: + add_local_tls_pair(object, sym_index, got_type, rel_dyn, r_type); + } + + unsigned int + add_constant(Valtype constant) + { + this->reserve_ent(); + return Output_data_got<size, big_endian>::add_constant(constant); + } + + unsigned int + add_constant_pair(Valtype c1, Valtype c2) + { + this->reserve_ent(2); + return Output_data_got<size, big_endian>::add_constant_pair(c1, c2); + } + + // 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. + Valtype + got_base_offset(const Powerpc_relobj<size, big_endian>* object) const + { + if (size == 32) + return this->g_o_t(); + else + return (this->output_section()->address() + + object->toc_base_offset() + - this->address()); + } + + // Ensure our GOT has a header. + void + set_final_data_size() + { + if (this->header_ent_cnt_ != 0) + this->make_header(); + Output_data_got<size, big_endian>::set_final_data_size(); + } + + // First word of GOT header needs some values that are not + // handled by Output_data_got so poke them in here. + // For 32-bit, address of .dynamic, for 64-bit, address of TOCbase. + void + do_write(Output_file* of) + { + Valtype val = 0; + if (size == 32 && this->layout_->dynamic_data() != NULL) + val = this->layout_->dynamic_section()->address(); + if (size == 64) + val = this->output_section()->address() + 0x8000; + this->replace_constant(this->header_index_, val); + Output_data_got<size, big_endian>::do_write(of); + } + +private: + void + reserve_ent(unsigned int cnt = 1) + { + if (this->header_ent_cnt_ == 0) + return; + if (this->num_entries() + cnt > this->header_index_) + this->make_header(); + } + + void + make_header() + { + this->header_ent_cnt_ = 0; + this->header_index_ = this->num_entries(); + if (size == 32) + { + Output_data_got<size, big_endian>::add_constant(0); + Output_data_got<size, big_endian>::add_constant(0); + Output_data_got<size, big_endian>::add_constant(0); + + // Define _GLOBAL_OFFSET_TABLE_ at the header + Symbol *gotsym = this->symtab_->lookup("_GLOBAL_OFFSET_TABLE_", NULL); + if (gotsym != NULL) + { + Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(gotsym); + sym->set_value(this->g_o_t()); + } + else + this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, + Symbol_table::PREDEFINED, + this, this->g_o_t(), 0, + elfcpp::STT_OBJECT, + elfcpp::STB_LOCAL, + elfcpp::STV_HIDDEN, 0, + false, false); + } + else + Output_data_got<size, big_endian>::add_constant(0); + } + + // Stashed pointers. + Symbol_table* symtab_; + Layout* layout_; + + // GOT header size. + unsigned int header_ent_cnt_; + // GOT header index. + unsigned int header_index_; +}; + +// Get the GOT section, creating it if necessary. + +template<int size, bool big_endian> +Output_data_got_powerpc<size, big_endian>* +Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab, + Layout* layout) +{ + if (this->got_ == NULL) + { + gold_assert(symtab != NULL && layout != NULL); + + this->got_ + = new Output_data_got_powerpc<size, big_endian>(symtab, layout); + + layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, + elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, + this->got_, ORDER_DATA, false); + } + + return this->got_; +} + +// Get the dynamic reloc section, creating it if necessary. + +template<int size, bool big_endian> +typename Target_powerpc<size, big_endian>::Reloc_section* +Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout) +{ + if (this->rela_dyn_ == NULL) + { + gold_assert(layout != NULL); + this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); + layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, + elfcpp::SHF_ALLOC, this->rela_dyn_, + ORDER_DYNAMIC_RELOCS, false); + } + return this->rela_dyn_; +} + +// Similarly, but for ifunc symbols get the one for ifunc. + +template<int size, bool big_endian> +typename Target_powerpc<size, big_endian>::Reloc_section* +Target_powerpc<size, big_endian>::rela_dyn_section(Symbol_table* symtab, + Layout* layout, + bool for_ifunc) +{ + if (!for_ifunc) + return this->rela_dyn_section(layout); + + if (this->iplt_ == NULL) + this->make_iplt_section(symtab, layout); + return this->iplt_->rel_plt(); +} + +class Stub_control +{ + public: + // Determine the stub group size. The group size is the absolute + // value of the parameter --stub-group-size. If --stub-group-size + // is passed a negative value, we restrict stubs to be always before + // the stubbed branches. + Stub_control(int32_t size) + : state_(NO_GROUP), stub_group_size_(abs(size)), + stub14_group_size_(abs(size) >> 10), + stubs_always_before_branch_(size < 0), suppress_size_errors_(false), + group_end_addr_(0), owner_(NULL), output_section_(NULL) + { + if (stub_group_size_ == 1) + { + // Default values. + if (stubs_always_before_branch_) + { + stub_group_size_ = 0x1e00000; + stub14_group_size_ = 0x7800; + } + else + { + stub_group_size_ = 0x1c00000; + stub14_group_size_ = 0x7000; + } + suppress_size_errors_ = true; + } + } + + // Return true iff input section can be handled by current stub + // group. + bool + can_add_to_stub_group(Output_section* o, + const Output_section::Input_section* i, + bool has14); + + const Output_section::Input_section* + owner() + { return owner_; } + + Output_section* + output_section() + { return output_section_; } + + void + set_output_and_owner(Output_section* o, + const Output_section::Input_section* i) + { + this->output_section_ = o; + this->owner_ = i; + } + + private: + typedef enum + { + NO_GROUP, + FINDING_STUB_SECTION, + HAS_STUB_SECTION + } State; + + State state_; + uint32_t stub_group_size_; + uint32_t stub14_group_size_; + bool stubs_always_before_branch_; + bool suppress_size_errors_; + uint64_t group_end_addr_; + const Output_section::Input_section* owner_; + Output_section* output_section_; +}; + +// Return true iff input section can be handled by current stub +// group. + +bool +Stub_control::can_add_to_stub_group(Output_section* o, + const Output_section::Input_section* i, + bool has14) +{ + uint32_t group_size + = has14 ? this->stub14_group_size_ : this->stub_group_size_; + bool whole_sec = o->order() == ORDER_INIT || o->order() == ORDER_FINI; + uint64_t this_size; + uint64_t start_addr = o->address(); + + if (whole_sec) + // .init and .fini sections are pasted together to form a single + // function. We can't be adding stubs in the middle of the function. + this_size = o->data_size(); + else + { + start_addr += i->relobj()->output_section_offset(i->shndx()); + this_size = i->data_size(); + } + uint64_t end_addr = start_addr + this_size; + bool toobig = this_size > group_size; + + if (toobig && !this->suppress_size_errors_) + gold_warning(_("%s:%s exceeds group size"), + i->relobj()->name().c_str(), + i->relobj()->section_name(i->shndx()).c_str()); + + if (this->state_ != HAS_STUB_SECTION + && (!whole_sec || this->output_section_ != o) + && (this->state_ == NO_GROUP + || this->group_end_addr_ - end_addr < group_size)) + { + this->owner_ = i; + this->output_section_ = o; + } + + if (this->state_ == NO_GROUP) + { + this->state_ = FINDING_STUB_SECTION; + this->group_end_addr_ = end_addr; + } + else if (this->group_end_addr_ - start_addr < group_size) + ; + // Adding this section would make the group larger than GROUP_SIZE. + else if (this->state_ == FINDING_STUB_SECTION + && !this->stubs_always_before_branch_ + && !toobig) + { + // But wait, there's more! Input sections up to GROUP_SIZE + // bytes before the stub table can be handled by it too. + this->state_ = HAS_STUB_SECTION; + this->group_end_addr_ = end_addr; + } + else + { + this->state_ = NO_GROUP; + return false; + } + return true; +} + +// Look over all the input sections, deciding where to place stubs. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::group_sections(Layout* layout, + const Task*) +{ + Stub_control stub_control(parameters->options().stub_group_size()); + + // Group input sections and insert stub table + Stub_table<size, big_endian>* stub_table = NULL; + Layout::Section_list section_list; + layout->get_executable_sections(§ion_list); + std::stable_sort(section_list.begin(), section_list.end(), Sort_sections()); + for (Layout::Section_list::reverse_iterator o = section_list.rbegin(); + o != section_list.rend(); + ++o) + { + typedef Output_section::Input_section_list Input_section_list; + for (Input_section_list::const_reverse_iterator i + = (*o)->input_sections().rbegin(); + i != (*o)->input_sections().rend(); + ++i) + { + if (i->is_input_section()) + { + Powerpc_relobj<size, big_endian>* ppcobj = static_cast + <Powerpc_relobj<size, big_endian>*>(i->relobj()); + bool has14 = ppcobj->has_14bit_branch(i->shndx()); + if (!stub_control.can_add_to_stub_group(*o, &*i, has14)) + { + stub_table->init(stub_control.owner(), + stub_control.output_section()); + stub_control.set_output_and_owner(*o, &*i); + stub_table = NULL; + } + if (stub_table == NULL) + stub_table = this->new_stub_table(); + ppcobj->set_stub_table(i->shndx(), stub_table); + } + } + } + if (stub_table != NULL) + { + const Output_section::Input_section* i = stub_control.owner(); + if (!i->is_input_section()) + { + // Corner case. A new stub group was made for the first + // section (last one looked at here) for some reason, but + // the first section is already being used as the owner for + // a stub table for following sections. Force it into that + // stub group. + gold_assert(this->stub_tables_.size() >= 2); + this->stub_tables_.pop_back(); + delete stub_table; + Powerpc_relobj<size, big_endian>* ppcobj = static_cast + <Powerpc_relobj<size, big_endian>*>(i->relobj()); + ppcobj->set_stub_table(i->shndx(), this->stub_tables_.back()); + } + else + stub_table->init(i, stub_control.output_section()); + } +} + +// If this branch needs a plt call stub, or a long branch stub, make one. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::Branch_info::make_stub( + Stub_table<size, big_endian>* stub_table, + Stub_table<size, big_endian>* ifunc_stub_table, + Symbol_table* symtab) const +{ + Symbol* sym = this->object_->global_symbol(this->r_sym_); + if (sym != NULL && sym->is_forwarder()) + sym = symtab->resolve_forwards(sym); + const Sized_symbol<size>* gsym = static_cast<const Sized_symbol<size>*>(sym); + Target_powerpc<size, big_endian>* target = + static_cast<Target_powerpc<size, big_endian>*>( + parameters->sized_target<size, big_endian>()); + if (gsym != NULL + ? gsym->use_plt_offset(Scan::get_reference_flags(this->r_type_, target)) + : this->object_->local_has_plt_offset(this->r_sym_)) + { + if (size == 64 + && gsym != NULL + && target->abiversion() >= 2 + && !parameters->options().output_is_position_independent() + && !is_branch_reloc(this->r_type_)) + target->glink_section()->add_global_entry(gsym); + else + { + if (stub_table == NULL) + stub_table = this->object_->stub_table(this->shndx_); + if (stub_table == NULL) + { + // This is a ref from a data section to an ifunc symbol. + stub_table = ifunc_stub_table; + } + gold_assert(stub_table != NULL); + if (gsym != NULL) + stub_table->add_plt_call_entry(this->object_, gsym, + this->r_type_, this->addend_); + else + stub_table->add_plt_call_entry(this->object_, this->r_sym_, + this->r_type_, this->addend_); + } + } + else + { + Address max_branch_offset; + if (this->r_type_ == elfcpp::R_POWERPC_REL14 + || this->r_type_ == elfcpp::R_POWERPC_REL14_BRTAKEN + || this->r_type_ == elfcpp::R_POWERPC_REL14_BRNTAKEN) + max_branch_offset = 1 << 15; + else if (this->r_type_ == elfcpp::R_POWERPC_REL24 + || this->r_type_ == elfcpp::R_PPC_PLTREL24 + || this->r_type_ == elfcpp::R_PPC_LOCAL24PC) + max_branch_offset = 1 << 25; + else + return; + Address from = this->object_->get_output_section_offset(this->shndx_); + gold_assert(from != invalid_address); + from += (this->object_->output_section(this->shndx_)->address() + + this->offset_); + Address to; + if (gsym != NULL) + { + switch (gsym->source()) + { + case Symbol::FROM_OBJECT: + { + Object* symobj = gsym->object(); + if (symobj->is_dynamic() + || symobj->pluginobj() != NULL) + return; + bool is_ordinary; + unsigned int shndx = gsym->shndx(&is_ordinary); + if (shndx == elfcpp::SHN_UNDEF) + return; + } + break; + + case Symbol::IS_UNDEFINED: + return; + + default: + break; + } + Symbol_table::Compute_final_value_status status; + to = symtab->compute_final_value<size>(gsym, &status); + if (status != Symbol_table::CFVS_OK) + return; + if (size == 64) + to += this->object_->ppc64_local_entry_offset(gsym); + } + else + { + const Symbol_value<size>* psymval + = this->object_->local_symbol(this->r_sym_); + Symbol_value<size> symval; + typedef Sized_relobj_file<size, big_endian> ObjType; + typename ObjType::Compute_final_local_value_status status + = this->object_->compute_final_local_value(this->r_sym_, psymval, + &symval, symtab); + if (status != ObjType::CFLV_OK + || !symval.has_output_value()) + return; + to = symval.value(this->object_, 0); + if (size == 64) + to += this->object_->ppc64_local_entry_offset(this->r_sym_); + } + if (!(size == 32 && this->r_type_ == elfcpp::R_PPC_PLTREL24)) + to += this->addend_; + if (stub_table == NULL) + stub_table = this->object_->stub_table(this->shndx_); + if (size == 64 && target->abiversion() < 2) + { + unsigned int dest_shndx; + if (!target->symval_for_branch(symtab, gsym, this->object_, + &to, &dest_shndx)) + return; + } + Address delta = to - from; + if (delta + max_branch_offset >= 2 * max_branch_offset) + { + if (stub_table == NULL) + { + gold_warning(_("%s:%s: branch in non-executable section," + " no long branch stub for you"), + this->object_->name().c_str(), + this->object_->section_name(this->shndx_).c_str()); + return; + } + stub_table->add_long_branch_entry(this->object_, to); + } + } +} + +// Relaxation hook. This is where we do stub generation. + +template<int size, bool big_endian> +bool +Target_powerpc<size, big_endian>::do_relax(int pass, + const Input_objects*, + Symbol_table* symtab, + Layout* layout, + const Task* task) +{ + unsigned int prev_brlt_size = 0; + if (pass == 1) + { + bool thread_safe + = this->abiversion() < 2 && parameters->options().plt_thread_safe(); + if (size == 64 + && this->abiversion() < 2 + && !thread_safe + && !parameters->options().user_set_plt_thread_safe()) + { + static const char* const thread_starter[] = + { + "pthread_create", + /* libstdc++ */ + "_ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEE", + /* librt */ + "aio_init", "aio_read", "aio_write", "aio_fsync", "lio_listio", + "mq_notify", "create_timer", + /* libanl */ + "getaddrinfo_a", + /* libgomp */ + "GOMP_parallel", + "GOMP_parallel_start", + "GOMP_parallel_loop_static", + "GOMP_parallel_loop_static_start", + "GOMP_parallel_loop_dynamic", + "GOMP_parallel_loop_dynamic_start", + "GOMP_parallel_loop_guided", + "GOMP_parallel_loop_guided_start", + "GOMP_parallel_loop_runtime", + "GOMP_parallel_loop_runtime_start", + "GOMP_parallel_sections", + "GOMP_parallel_sections_start", + /* libgo */ + "__go_go", + }; + + if (parameters->options().shared()) + thread_safe = true; + else + { + for (unsigned int i = 0; + i < sizeof(thread_starter) / sizeof(thread_starter[0]); + i++) + { + Symbol* sym = symtab->lookup(thread_starter[i], NULL); + thread_safe = (sym != NULL + && sym->in_reg() + && sym->in_real_elf()); + if (thread_safe) + break; + } + } + } + this->plt_thread_safe_ = thread_safe; + this->group_sections(layout, task); + } + + // We need address of stub tables valid for make_stub. + for (typename Stub_tables::iterator p = this->stub_tables_.begin(); + p != this->stub_tables_.end(); + ++p) + { + const Powerpc_relobj<size, big_endian>* object + = static_cast<const Powerpc_relobj<size, big_endian>*>((*p)->relobj()); + Address off = object->get_output_section_offset((*p)->shndx()); + gold_assert(off != invalid_address); + Output_section* os = (*p)->output_section(); + (*p)->set_address_and_size(os, off); + } + + if (pass != 1) + { + // Clear plt call stubs, long branch stubs and branch lookup table. + prev_brlt_size = this->branch_lookup_table_.size(); + this->branch_lookup_table_.clear(); + for (typename Stub_tables::iterator p = this->stub_tables_.begin(); + p != this->stub_tables_.end(); + ++p) + { + (*p)->clear_stubs(); + } + } + + // Build all the stubs. + Stub_table<size, big_endian>* ifunc_stub_table + = this->stub_tables_.size() == 0 ? NULL : this->stub_tables_[0]; + Stub_table<size, big_endian>* one_stub_table + = this->stub_tables_.size() != 1 ? NULL : ifunc_stub_table; + for (typename Branches::const_iterator b = this->branch_info_.begin(); + b != this->branch_info_.end(); + b++) + { + b->make_stub(one_stub_table, ifunc_stub_table, symtab); + } + + // Did anything change size? + unsigned int num_huge_branches = this->branch_lookup_table_.size(); + bool again = num_huge_branches != prev_brlt_size; + if (size == 64 && num_huge_branches != 0) + this->make_brlt_section(layout); + if (size == 64 && again) + this->brlt_section_->set_current_size(num_huge_branches); + + typedef Unordered_set<Output_section*> Output_sections; + Output_sections os_need_update; + for (typename Stub_tables::iterator p = this->stub_tables_.begin(); + p != this->stub_tables_.end(); + ++p) + { + if ((*p)->size_update()) + { + again = true; + (*p)->add_eh_frame(layout); + os_need_update.insert((*p)->output_section()); + } + } + + // Set output section offsets for all input sections in an output + // section that just changed size. Anything past the stubs will + // need updating. + for (typename Output_sections::iterator p = os_need_update.begin(); + p != os_need_update.end(); + p++) + { + Output_section* os = *p; + Address off = 0; + typedef Output_section::Input_section_list Input_section_list; + for (Input_section_list::const_iterator i = os->input_sections().begin(); + i != os->input_sections().end(); + ++i) + { + off = align_address(off, i->addralign()); + if (i->is_input_section() || i->is_relaxed_input_section()) + i->relobj()->set_section_offset(i->shndx(), off); + if (i->is_relaxed_input_section()) + { + Stub_table<size, big_endian>* stub_table + = static_cast<Stub_table<size, big_endian>*>( + i->relaxed_input_section()); + off += stub_table->set_address_and_size(os, off); + } + else + off += i->data_size(); + } + // If .branch_lt is part of this output section, then we have + // just done the offset adjustment. + os->clear_section_offsets_need_adjustment(); + } + + if (size == 64 + && !again + && num_huge_branches != 0 + && parameters->options().output_is_position_independent()) + { + // Fill in the BRLT relocs. + this->brlt_section_->reset_brlt_sizes(); + for (typename Branch_lookup_table::const_iterator p + = this->branch_lookup_table_.begin(); + p != this->branch_lookup_table_.end(); + ++p) + { + this->brlt_section_->add_reloc(p->first, p->second); + } + this->brlt_section_->finalize_brlt_sizes(); + } + return again; +} + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::do_plt_fde_location(const Output_data* plt, + unsigned char* oview, + uint64_t* paddress, + off_t* plen) const +{ + uint64_t address = plt->address(); + off_t len = plt->data_size(); + + if (plt == this->glink_) + { + // See Output_data_glink::do_write() for glink contents. + if (len == 0) + { + gold_assert(parameters->doing_static_link()); + // Static linking may need stubs, to support ifunc and long + // branches. We need to create an output section for + // .eh_frame early in the link process, to have a place to + // attach stub .eh_frame info. We also need to have + // registered a CIE that matches the stub CIE. Both of + // these requirements are satisfied by creating an FDE and + // CIE for .glink, even though static linking will leave + // .glink zero length. + // ??? Hopefully generating an FDE with a zero address range + // won't confuse anything that consumes .eh_frame info. + } + else if (size == 64) + { + // There is one word before __glink_PLTresolve + address += 8; + len -= 8; + } + else if (parameters->options().output_is_position_independent()) + { + // There are two FDEs for a position independent glink. + // The first covers the branch table, the second + // __glink_PLTresolve at the end of glink. + off_t resolve_size = this->glink_->pltresolve_size; + if (oview[9] == elfcpp::DW_CFA_nop) + len -= resolve_size; + else + { + address += len - resolve_size; + len = resolve_size; + } + } + } + else + { + // Must be a stub table. + const Stub_table<size, big_endian>* stub_table + = static_cast<const Stub_table<size, big_endian>*>(plt); + uint64_t stub_address = stub_table->stub_address(); + len -= stub_address - address; + address = stub_address; + } + + *paddress = address; + *plen = len; +} + +// A class to handle the PLT data. + +template<int size, bool big_endian> +class Output_data_plt_powerpc : public Output_section_data_build +{ + public: + typedef Output_data_reloc<elfcpp::SHT_RELA, true, + size, big_endian> Reloc_section; + + Output_data_plt_powerpc(Target_powerpc<size, big_endian>* targ, + Reloc_section* plt_rel, + const char* name) + : Output_section_data_build(size == 32 ? 4 : 8), + rel_(plt_rel), + targ_(targ), + name_(name) + { } + + // Add an entry to the PLT. + void + add_entry(Symbol*); + + void + add_ifunc_entry(Symbol*); + + void + add_local_ifunc_entry(Sized_relobj_file<size, big_endian>*, unsigned int); + + // Return the .rela.plt section data. + Reloc_section* + rel_plt() const + { + return this->rel_; + } + + // Return the number of PLT entries. + unsigned int + entry_count() const + { + if (this->current_data_size() == 0) + return 0; + return ((this->current_data_size() - this->first_plt_entry_offset()) + / this->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: + // Return the offset of the first non-reserved PLT entry. + unsigned int + first_plt_entry_offset() const + { + // IPLT has no reserved entry. + if (this->name_[3] == 'I') + return 0; + return this->targ_->first_plt_entry_offset(); + } + + // Return the size of each PLT entry. + unsigned int + plt_entry_size() const + { + return this->targ_->plt_entry_size(); + } + + // Write out the PLT data. + void + do_write(Output_file*); + + // The reloc section. + Reloc_section* rel_; + // Allows access to .glink for do_write. + Target_powerpc<size, big_endian>* targ_; + // What to report in map file. + const char *name_; +}; + +// Add an entry to the PLT. + +template<int size, bool big_endian> +void +Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym) +{ + if (!gsym->has_plt_offset()) + { + section_size_type 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 += this->plt_entry_size(); + this->set_current_data_size(off); + } +} + +// Add an entry for a global ifunc symbol that resolves locally, to the IPLT. + +template<int size, bool big_endian> +void +Output_data_plt_powerpc<size, big_endian>::add_ifunc_entry(Symbol* gsym) +{ + if (!gsym->has_plt_offset()) + { + section_size_type off = this->current_data_size(); + gsym->set_plt_offset(off); + unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; + if (size == 64 && this->targ_->abiversion() < 2) + dynrel = elfcpp::R_PPC64_JMP_IREL; + this->rel_->add_symbolless_global_addend(gsym, dynrel, this, off, 0); + off += this->plt_entry_size(); + this->set_current_data_size(off); + } +} + +// Add an entry for a local ifunc symbol to the IPLT. + +template<int size, bool big_endian> +void +Output_data_plt_powerpc<size, big_endian>::add_local_ifunc_entry( + Sized_relobj_file<size, big_endian>* relobj, + unsigned int local_sym_index) +{ + if (!relobj->local_has_plt_offset(local_sym_index)) + { + section_size_type off = this->current_data_size(); + relobj->set_local_plt_offset(local_sym_index, off); + unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; + if (size == 64 && this->targ_->abiversion() < 2) + dynrel = elfcpp::R_PPC64_JMP_IREL; + this->rel_->add_symbolless_local_addend(relobj, local_sym_index, dynrel, + this, off, 0); + off += this->plt_entry_size(); + this->set_current_data_size(off); + } +} + +static const uint32_t add_0_11_11 = 0x7c0b5a14; +static const uint32_t add_2_2_11 = 0x7c425a14; +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_11_2_11 = 0x7d625a14; +static const uint32_t add_11_11_2 = 0x7d6b1214; +static const uint32_t addi_0_12 = 0x380c0000; +static const uint32_t addi_2_2 = 0x38420000; +static const uint32_t addi_3_3 = 0x38630000; +static const uint32_t addi_11_11 = 0x396b0000; +static const uint32_t addi_12_12 = 0x398c0000; +static const uint32_t addis_0_2 = 0x3c020000; +static const uint32_t addis_0_13 = 0x3c0d0000; +static const uint32_t addis_3_2 = 0x3c620000; +static const uint32_t addis_3_13 = 0x3c6d0000; +static const uint32_t addis_11_2 = 0x3d620000; +static const uint32_t addis_11_11 = 0x3d6b0000; +static const uint32_t addis_11_30 = 0x3d7e0000; +static const uint32_t addis_12_2 = 0x3d820000; +static const uint32_t addis_12_12 = 0x3d8c0000; +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 bnectr_p4 = 0x4ce20420; +static const uint32_t cmpldi_2_0 = 0x28220000; +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_2_1 = 0xe8410000; +static const uint32_t ld_2_2 = 0xe8420000; +static const uint32_t ld_2_11 = 0xe84b0000; +static const uint32_t ld_11_2 = 0xe9620000; +static const uint32_t ld_11_11 = 0xe96b0000; +static const uint32_t ld_12_2 = 0xe9820000; +static const uint32_t ld_12_11 = 0xe98b0000; +static const uint32_t ld_12_12 = 0xe98c0000; +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 lvx_0_12_0 = 0x7c0c00ce; +static const uint32_t lwz_0_12 = 0x800c0000; +static const uint32_t lwz_11_11 = 0x816b0000; +static const uint32_t lwz_11_30 = 0x817e0000; +static const uint32_t lwz_12_12 = 0x818c0000; +static const uint32_t lwzu_0_12 = 0x840c0000; +static const uint32_t mflr_0 = 0x7c0802a6; +static const uint32_t mflr_11 = 0x7d6802a6; +static const uint32_t mflr_12 = 0x7d8802a6; +static const uint32_t mtctr_0 = 0x7c0903a6; +static const uint32_t mtctr_11 = 0x7d6903a6; +static const uint32_t mtctr_12 = 0x7d8903a6; +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 srdi_0_0_2 = 0x7800f082; +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; +static const uint32_t sub_12_12_11 = 0x7d8b6050; +static const uint32_t xor_2_12_12 = 0x7d826278; +static const uint32_t xor_11_12_12 = 0x7d8b6278; + +// Write out the PLT. + +template<int size, bool big_endian> +void +Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of) +{ + if (size == 32 && this->name_[3] != 'I') + { + const section_size_type offset = this->offset(); + const section_size_type oview_size + = convert_to_section_size_type(this->data_size()); + unsigned char* const oview = of->get_output_view(offset, oview_size); + unsigned char* pov = oview; + unsigned char* endpov = oview + oview_size; + + // The address of the .glink branch table + const Output_data_glink<size, big_endian>* glink + = this->targ_->glink_section(); + elfcpp::Elf_types<32>::Elf_Addr branch_tab = glink->address(); + + while (pov < endpov) + { + elfcpp::Swap<32, big_endian>::writeval(pov, branch_tab); + pov += 4; + branch_tab += 4; + } + + of->write_output_view(offset, oview_size, oview); + } +} + +// Create the PLT section. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::make_plt_section(Symbol_table* symtab, + Layout* layout) +{ + if (this->plt_ == NULL) + { + if (this->got_ == NULL) + this->got_section(symtab, layout); + + 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 its range. + this->rela_dyn_section(layout); + + Reloc_section* plt_rel = new Reloc_section(false); + layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, + elfcpp::SHF_ALLOC, plt_rel, + ORDER_DYNAMIC_PLT_RELOCS, false); + this->plt_ + = new Output_data_plt_powerpc<size, big_endian>(this, plt_rel, + "** PLT"); + layout->add_output_section_data(".plt", + (size == 32 + ? elfcpp::SHT_PROGBITS + : elfcpp::SHT_NOBITS), + elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, + this->plt_, + (size == 32 + ? ORDER_SMALL_DATA + : ORDER_SMALL_BSS), + false); + } +} + +// Create the IPLT section. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::make_iplt_section(Symbol_table* symtab, + Layout* layout) +{ + if (this->iplt_ == NULL) + { + this->make_plt_section(symtab, layout); + + Reloc_section* iplt_rel = new Reloc_section(false); + this->rela_dyn_->output_section()->add_output_section_data(iplt_rel); + this->iplt_ + = new Output_data_plt_powerpc<size, big_endian>(this, iplt_rel, + "** IPLT"); + this->plt_->output_section()->add_output_section_data(this->iplt_); + } +} + +// A section for huge long branch addresses, similar to plt section. + +template<int size, bool big_endian> +class Output_data_brlt_powerpc : public Output_section_data_build +{ + public: + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + typedef Output_data_reloc<elfcpp::SHT_RELA, true, + size, big_endian> Reloc_section; + + Output_data_brlt_powerpc(Target_powerpc<size, big_endian>* targ, + Reloc_section* brlt_rel) + : Output_section_data_build(size == 32 ? 4 : 8), + rel_(brlt_rel), + targ_(targ) + { } + + void + reset_brlt_sizes() + { + this->reset_data_size(); + this->rel_->reset_data_size(); + } + + void + finalize_brlt_sizes() + { + this->finalize_data_size(); + this->rel_->finalize_data_size(); + } + + // Add a reloc for an entry in the BRLT. + void + add_reloc(Address to, unsigned int off) + { this->rel_->add_relative(elfcpp::R_POWERPC_RELATIVE, this, off, to); } + + // Update section and reloc section size. + void + set_current_size(unsigned int num_branches) + { + this->reset_address_and_file_offset(); + this->set_current_data_size(num_branches * 16); + this->finalize_data_size(); + Output_section* os = this->output_section(); + os->set_section_offsets_need_adjustment(); + if (this->rel_ != NULL) + { + unsigned int reloc_size + = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; + this->rel_->reset_address_and_file_offset(); + this->rel_->set_current_data_size(num_branches * reloc_size); + this->rel_->finalize_data_size(); + Output_section* os = this->rel_->output_section(); + os->set_section_offsets_need_adjustment(); + } + } + + 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, "** BRLT"); } + + private: + // Write out the BRLT data. + void + do_write(Output_file*); + + // The reloc section. + Reloc_section* rel_; + Target_powerpc<size, big_endian>* targ_; +}; + +// Make the branch lookup table section. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::make_brlt_section(Layout* layout) +{ + if (size == 64 && this->brlt_section_ == NULL) + { + Reloc_section* brlt_rel = NULL; + bool is_pic = parameters->options().output_is_position_independent(); + if (is_pic) + { + // When PIC we can't fill in .branch_lt (like .plt it can be + // a bss style section) but must initialise at runtime via + // dynamic relocats. + this->rela_dyn_section(layout); + brlt_rel = new Reloc_section(false); + this->rela_dyn_->output_section()->add_output_section_data(brlt_rel); + } + this->brlt_section_ + = new Output_data_brlt_powerpc<size, big_endian>(this, brlt_rel); + if (this->plt_ && is_pic) + this->plt_->output_section() + ->add_output_section_data(this->brlt_section_); + else + layout->add_output_section_data(".branch_lt", + (is_pic ? elfcpp::SHT_NOBITS + : elfcpp::SHT_PROGBITS), + elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, + this->brlt_section_, + (is_pic ? ORDER_SMALL_BSS + : ORDER_SMALL_DATA), + false); + } +} + +// Write out .branch_lt when non-PIC. + +template<int size, bool big_endian> +void +Output_data_brlt_powerpc<size, big_endian>::do_write(Output_file* of) +{ + if (size == 64 && !parameters->options().output_is_position_independent()) + { + const section_size_type 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); + + this->targ_->write_branch_lookup_table(oview); + of->write_output_view(offset, oview_size, oview); + } +} + +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<int size> +struct Eh_cie +{ + static const unsigned char eh_frame_cie[12]; +}; + +template<int size> +const unsigned char Eh_cie<size>::eh_frame_cie[] = +{ + 1, // CIE version. + 'z', 'R', 0, // Augmentation string. + 4, // Code alignment. + 0x80 - size / 8 , // Data alignment. + 65, // RA reg. + 1, // Augmentation size. + (elfcpp::DW_EH_PE_pcrel + | elfcpp::DW_EH_PE_sdata4), // FDE encoding. + elfcpp::DW_CFA_def_cfa, 1, 0 // def_cfa: r1 offset 0. +}; + +// Describe __glink_PLTresolve use of LR, 64-bit version ABIv1. +static const unsigned char glink_eh_frame_fde_64v1[] = +{ + 0, 0, 0, 0, // Replaced with offset to .glink. + 0, 0, 0, 0, // Replaced with size of .glink. + 0, // Augmentation size. + elfcpp::DW_CFA_advance_loc + 1, + elfcpp::DW_CFA_register, 65, 12, + elfcpp::DW_CFA_advance_loc + 4, + elfcpp::DW_CFA_restore_extended, 65 +}; + +// Describe __glink_PLTresolve use of LR, 64-bit version ABIv2. +static const unsigned char glink_eh_frame_fde_64v2[] = +{ + 0, 0, 0, 0, // Replaced with offset to .glink. + 0, 0, 0, 0, // Replaced with size of .glink. + 0, // Augmentation size. + elfcpp::DW_CFA_advance_loc + 1, + elfcpp::DW_CFA_register, 65, 0, + elfcpp::DW_CFA_advance_loc + 4, + elfcpp::DW_CFA_restore_extended, 65 +}; + +// Describe __glink_PLTresolve use of LR, 32-bit version. +static const unsigned char glink_eh_frame_fde_32[] = +{ + 0, 0, 0, 0, // Replaced with offset to .glink. + 0, 0, 0, 0, // Replaced with size of .glink. + 0, // Augmentation size. + elfcpp::DW_CFA_advance_loc + 2, + elfcpp::DW_CFA_register, 65, 0, + elfcpp::DW_CFA_advance_loc + 4, + elfcpp::DW_CFA_restore_extended, 65 +}; + +static const unsigned char default_fde[] = +{ + 0, 0, 0, 0, // Replaced with offset to stubs. + 0, 0, 0, 0, // Replaced with size of stubs. + 0, // Augmentation size. + elfcpp::DW_CFA_nop, // Pad. + elfcpp::DW_CFA_nop, + elfcpp::DW_CFA_nop +}; + +template<bool big_endian> +static inline void +write_insn(unsigned char* p, uint32_t v) +{ + elfcpp::Swap<32, big_endian>::writeval(p, v); +} + +// Stub_table holds information about plt and long branch stubs. +// Stubs are built in an area following some input section determined +// by group_sections(). This input section is converted to a relaxed +// input section allowing it to be resized to accommodate the stubs + +template<int size, bool big_endian> +class Stub_table : public Output_relaxed_input_section +{ + public: + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + static const Address invalid_address = static_cast<Address>(0) - 1; + + Stub_table(Target_powerpc<size, big_endian>* targ) + : Output_relaxed_input_section(NULL, 0, 0), + targ_(targ), plt_call_stubs_(), long_branch_stubs_(), + orig_data_size_(0), plt_size_(0), last_plt_size_(0), + branch_size_(0), last_branch_size_(0), eh_frame_added_(false) + { } + + // Delayed Output_relaxed_input_section init. + void + init(const Output_section::Input_section*, Output_section*); + + // Add a plt call stub. + void + add_plt_call_entry(const Sized_relobj_file<size, big_endian>*, + const Symbol*, + unsigned int, + Address); + + void + add_plt_call_entry(const Sized_relobj_file<size, big_endian>*, + unsigned int, + unsigned int, + Address); + + // Find a given plt call stub. + Address + find_plt_call_entry(const Symbol*) const; + + Address + find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, + unsigned int) const; + + Address + find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, + const Symbol*, + unsigned int, + Address) const; + + Address + find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, + unsigned int, + unsigned int, + Address) const; + + // Add a long branch stub. + void + add_long_branch_entry(const Powerpc_relobj<size, big_endian>*, Address); + + Address + find_long_branch_entry(const Powerpc_relobj<size, big_endian>*, + Address) const; + + void + clear_stubs() + { + this->plt_call_stubs_.clear(); + this->plt_size_ = 0; + this->long_branch_stubs_.clear(); + this->branch_size_ = 0; + } + + Address + set_address_and_size(const Output_section* os, Address off) + { + Address start_off = off; + off += this->orig_data_size_; + Address my_size = this->plt_size_ + this->branch_size_; + if (my_size != 0) + off = align_address(off, this->stub_align()); + // Include original section size and alignment padding in size + my_size += off - start_off; + this->reset_address_and_file_offset(); + this->set_current_data_size(my_size); + this->set_address_and_file_offset(os->address() + start_off, + os->offset() + start_off); + return my_size; + } + + Address + stub_address() const + { + return align_address(this->address() + this->orig_data_size_, + this->stub_align()); + } + + Address + stub_offset() const + { + return align_address(this->offset() + this->orig_data_size_, + this->stub_align()); + } + + section_size_type + plt_size() const + { return this->plt_size_; } + + bool + size_update() + { + Output_section* os = this->output_section(); + if (os->addralign() < this->stub_align()) + { + os->set_addralign(this->stub_align()); + // FIXME: get rid of the insane checkpointing. + // We can't increase alignment of the input section to which + // stubs are attached; The input section may be .init which + // is pasted together with other .init sections to form a + // function. Aligning might insert zero padding resulting in + // sigill. However we do need to increase alignment of the + // output section so that the align_address() on offset in + // set_address_and_size() adds the same padding as the + // align_address() on address in stub_address(). + // What's more, we need this alignment for the layout done in + // relaxation_loop_body() so that the output section starts at + // a suitably aligned address. + os->checkpoint_set_addralign(this->stub_align()); + } + if (this->last_plt_size_ != this->plt_size_ + || this->last_branch_size_ != this->branch_size_) + { + this->last_plt_size_ = this->plt_size_; + this->last_branch_size_ = this->branch_size_; + return true; + } + return false; + } + + // Add .eh_frame info for this stub section. Unlike other linker + // generated .eh_frame this is added late in the link, because we + // only want the .eh_frame info if this particular stub section is + // non-empty. + void + add_eh_frame(Layout* layout) + { + if (!this->eh_frame_added_) + { + if (!parameters->options().ld_generated_unwind_info()) + return; + + // Since we add stub .eh_frame info late, it must be placed + // after all other linker generated .eh_frame info so that + // merge mapping need not be updated for input sections. + // There is no provision to use a different CIE to that used + // by .glink. + if (!this->targ_->has_glink()) + return; + + layout->add_eh_frame_for_plt(this, + Eh_cie<size>::eh_frame_cie, + sizeof (Eh_cie<size>::eh_frame_cie), + default_fde, + sizeof (default_fde)); + this->eh_frame_added_ = true; + } + } + + Target_powerpc<size, big_endian>* + targ() const + { return targ_; } + + private: + class Plt_stub_ent; + class Plt_stub_ent_hash; + typedef Unordered_map<Plt_stub_ent, unsigned int, + Plt_stub_ent_hash> Plt_stub_entries; + + // Alignment of stub section. + unsigned int + stub_align() const + { + if (size == 32) + return 16; + unsigned int min_align = 32; + unsigned int user_align = 1 << parameters->options().plt_align(); + return std::max(user_align, min_align); + } + + // Return the plt offset for the given call stub. + Address + plt_off(typename Plt_stub_entries::const_iterator p, bool* is_iplt) const + { + const Symbol* gsym = p->first.sym_; + if (gsym != NULL) + { + *is_iplt = (gsym->type() == elfcpp::STT_GNU_IFUNC + && gsym->can_use_relative_reloc(false)); + return gsym->plt_offset(); + } + else + { + *is_iplt = true; + const Sized_relobj_file<size, big_endian>* relobj = p->first.object_; + unsigned int local_sym_index = p->first.locsym_; + return relobj->local_plt_offset(local_sym_index); + } + } + + // Size of a given plt call stub. + unsigned int + plt_call_size(typename Plt_stub_entries::const_iterator p) const + { + if (size == 32) + return 16; + + bool is_iplt; + Address plt_addr = this->plt_off(p, &is_iplt); + if (is_iplt) + plt_addr += this->targ_->iplt_section()->address(); + else + plt_addr += this->targ_->plt_section()->address(); + Address got_addr = this->targ_->got_section()->output_section()->address(); + const Powerpc_relobj<size, big_endian>* ppcobj = static_cast + <const Powerpc_relobj<size, big_endian>*>(p->first.object_); + got_addr += ppcobj->toc_base_offset(); + Address off = plt_addr - got_addr; + unsigned int bytes = 4 * 4 + 4 * (ha(off) != 0); + if (this->targ_->abiversion() < 2) + { + bool static_chain = parameters->options().plt_static_chain(); + bool thread_safe = this->targ_->plt_thread_safe(); + bytes += (4 + + 4 * static_chain + + 8 * thread_safe + + 4 * (ha(off + 8 + 8 * static_chain) != ha(off))); + } + unsigned int align = 1 << parameters->options().plt_align(); + if (align > 1) + bytes = (bytes + align - 1) & -align; + return bytes; + } + + // Return long branch stub size. + unsigned int + branch_stub_size(Address to) + { + Address loc + = this->stub_address() + this->last_plt_size_ + this->branch_size_; + if (to - loc + (1 << 25) < 2 << 25) + return 4; + if (size == 64 || !parameters->options().output_is_position_independent()) + return 16; + return 32; + } + + // Write out stubs. + void + do_write(Output_file*); + + // Plt call stub keys. + class Plt_stub_ent + { + public: + Plt_stub_ent(const Symbol* sym) + : sym_(sym), object_(0), addend_(0), locsym_(0) + { } + + Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object, + unsigned int locsym_index) + : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) + { } + + Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object, + const Symbol* sym, + unsigned int r_type, + Address addend) + : sym_(sym), object_(0), addend_(0), locsym_(0) + { + if (size != 32) + this->addend_ = addend; + else if (parameters->options().output_is_position_independent() + && r_type == elfcpp::R_PPC_PLTREL24) + { + this->addend_ = addend; + if (this->addend_ >= 32768) + this->object_ = object; + } + } + + Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object, + unsigned int locsym_index, + unsigned int r_type, + Address addend) + : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) + { + if (size != 32) + this->addend_ = addend; + else if (parameters->options().output_is_position_independent() + && r_type == elfcpp::R_PPC_PLTREL24) + this->addend_ = addend; + } + + bool operator==(const Plt_stub_ent& that) const + { + return (this->sym_ == that.sym_ + && this->object_ == that.object_ + && this->addend_ == that.addend_ + && this->locsym_ == that.locsym_); + } + + const Symbol* sym_; + const Sized_relobj_file<size, big_endian>* object_; + typename elfcpp::Elf_types<size>::Elf_Addr addend_; + unsigned int locsym_; + }; + + class Plt_stub_ent_hash + { + public: + size_t operator()(const Plt_stub_ent& ent) const + { + return (reinterpret_cast<uintptr_t>(ent.sym_) + ^ reinterpret_cast<uintptr_t>(ent.object_) + ^ ent.addend_ + ^ ent.locsym_); + } + }; + + // Long branch stub keys. + class Branch_stub_ent + { + public: + Branch_stub_ent(const Powerpc_relobj<size, big_endian>* obj, Address to) + : dest_(to), toc_base_off_(0) + { + if (size == 64) + toc_base_off_ = obj->toc_base_offset(); + } + + bool operator==(const Branch_stub_ent& that) const + { + return (this->dest_ == that.dest_ + && (size == 32 + || this->toc_base_off_ == that.toc_base_off_)); + } + + Address dest_; + unsigned int toc_base_off_; + }; + + class Branch_stub_ent_hash + { + public: + size_t operator()(const Branch_stub_ent& ent) const + { return ent.dest_ ^ ent.toc_base_off_; } + }; + + // In a sane world this would be a global. + Target_powerpc<size, big_endian>* targ_; + // Map sym/object/addend to stub offset. + Plt_stub_entries plt_call_stubs_; + // Map destination address to stub offset. + typedef Unordered_map<Branch_stub_ent, unsigned int, + Branch_stub_ent_hash> Branch_stub_entries; + Branch_stub_entries long_branch_stubs_; + // size of input section + section_size_type orig_data_size_; + // size of stubs + section_size_type plt_size_, last_plt_size_, branch_size_, last_branch_size_; + // Whether .eh_frame info has been created for this stub section. + bool eh_frame_added_; +}; + +// Make a new stub table, and record. + +template<int size, bool big_endian> +Stub_table<size, big_endian>* +Target_powerpc<size, big_endian>::new_stub_table() +{ + Stub_table<size, big_endian>* stub_table + = new Stub_table<size, big_endian>(this); + this->stub_tables_.push_back(stub_table); + return stub_table; +} + +// Delayed stub table initialisation, because we create the stub table +// before we know to which section it will be attached. + +template<int size, bool big_endian> +void +Stub_table<size, big_endian>::init( + const Output_section::Input_section* owner, + Output_section* output_section) +{ + this->set_relobj(owner->relobj()); + this->set_shndx(owner->shndx()); + this->set_addralign(this->relobj()->section_addralign(this->shndx())); + this->set_output_section(output_section); + this->orig_data_size_ = owner->current_data_size(); + + std::vector<Output_relaxed_input_section*> new_relaxed; + new_relaxed.push_back(this); + output_section->convert_input_sections_to_relaxed_sections(new_relaxed); +} + +// Add a plt call stub, if we do not already have one for this +// sym/object/addend combo. + +template<int size, bool big_endian> +void +Stub_table<size, big_endian>::add_plt_call_entry( + const Sized_relobj_file<size, big_endian>* object, + const Symbol* gsym, + unsigned int r_type, + Address addend) +{ + Plt_stub_ent ent(object, gsym, r_type, addend); + unsigned int off = this->plt_size_; + std::pair<typename Plt_stub_entries::iterator, bool> p + = this->plt_call_stubs_.insert(std::make_pair(ent, off)); + if (p.second) + this->plt_size_ = off + this->plt_call_size(p.first); +} + +template<int size, bool big_endian> +void +Stub_table<size, big_endian>::add_plt_call_entry( + const Sized_relobj_file<size, big_endian>* object, + unsigned int locsym_index, + unsigned int r_type, + Address addend) +{ + Plt_stub_ent ent(object, locsym_index, r_type, addend); + unsigned int off = this->plt_size_; + std::pair<typename Plt_stub_entries::iterator, bool> p + = this->plt_call_stubs_.insert(std::make_pair(ent, off)); + if (p.second) + this->plt_size_ = off + this->plt_call_size(p.first); +} + +// Find a plt call stub. + +template<int size, bool big_endian> +typename Stub_table<size, big_endian>::Address +Stub_table<size, big_endian>::find_plt_call_entry( + const Sized_relobj_file<size, big_endian>* object, + const Symbol* gsym, + unsigned int r_type, + Address addend) const +{ + Plt_stub_ent ent(object, gsym, r_type, addend); + typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent); + return p == this->plt_call_stubs_.end() ? invalid_address : p->second; +} + +template<int size, bool big_endian> +typename Stub_table<size, big_endian>::Address +Stub_table<size, big_endian>::find_plt_call_entry(const Symbol* gsym) const +{ + Plt_stub_ent ent(gsym); + typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent); + return p == this->plt_call_stubs_.end() ? invalid_address : p->second; +} + +template<int size, bool big_endian> +typename Stub_table<size, big_endian>::Address +Stub_table<size, big_endian>::find_plt_call_entry( + const Sized_relobj_file<size, big_endian>* object, + unsigned int locsym_index, + unsigned int r_type, + Address addend) const +{ + Plt_stub_ent ent(object, locsym_index, r_type, addend); + typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent); + return p == this->plt_call_stubs_.end() ? invalid_address : p->second; +} + +template<int size, bool big_endian> +typename Stub_table<size, big_endian>::Address +Stub_table<size, big_endian>::find_plt_call_entry( + const Sized_relobj_file<size, big_endian>* object, + unsigned int locsym_index) const +{ + Plt_stub_ent ent(object, locsym_index); + typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent); + return p == this->plt_call_stubs_.end() ? invalid_address : p->second; +} + +// Add a long branch stub if we don't already have one to given +// destination. + +template<int size, bool big_endian> +void +Stub_table<size, big_endian>::add_long_branch_entry( + const Powerpc_relobj<size, big_endian>* object, + Address to) +{ + Branch_stub_ent ent(object, to); + Address off = this->branch_size_; + if (this->long_branch_stubs_.insert(std::make_pair(ent, off)).second) + { + unsigned int stub_size = this->branch_stub_size(to); + this->branch_size_ = off + stub_size; + if (size == 64 && stub_size != 4) + this->targ_->add_branch_lookup_table(to); + } +} + +// Find long branch stub. + +template<int size, bool big_endian> +typename Stub_table<size, big_endian>::Address +Stub_table<size, big_endian>::find_long_branch_entry( + const Powerpc_relobj<size, big_endian>* object, + Address to) const +{ + Branch_stub_ent ent(object, to); + typename Branch_stub_entries::const_iterator p + = this->long_branch_stubs_.find(ent); + return p == this->long_branch_stubs_.end() ? invalid_address : p->second; +} + +// A class to handle .glink. + +template<int size, bool big_endian> +class Output_data_glink : public Output_section_data +{ + public: + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + static const Address invalid_address = static_cast<Address>(0) - 1; + static const int pltresolve_size = 16*4; + + Output_data_glink(Target_powerpc<size, big_endian>* targ) + : Output_section_data(16), targ_(targ), global_entry_stubs_(), + end_branch_table_(), ge_size_(0) + { } + + void + add_eh_frame(Layout* layout); + + void + add_global_entry(const Symbol*); + + Address + find_global_entry(const Symbol*) const; + + Address + global_entry_address() const + { + gold_assert(this->is_data_size_valid()); + unsigned int global_entry_off = (this->end_branch_table_ + 15) & -16; + return this->address() + global_entry_off; + } + + 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*); + + // Allows access to .got and .plt for do_write. + Target_powerpc<size, big_endian>* targ_; + + // Map sym to stub offset. + typedef Unordered_map<const Symbol*, unsigned int> Global_entry_stub_entries; + Global_entry_stub_entries global_entry_stubs_; + + unsigned int end_branch_table_, ge_size_; +}; + +template<int size, bool big_endian> +void +Output_data_glink<size, big_endian>::add_eh_frame(Layout* layout) +{ + if (!parameters->options().ld_generated_unwind_info()) + return; + + if (size == 64) + { + if (this->targ_->abiversion() < 2) + layout->add_eh_frame_for_plt(this, + Eh_cie<64>::eh_frame_cie, + sizeof (Eh_cie<64>::eh_frame_cie), + glink_eh_frame_fde_64v1, + sizeof (glink_eh_frame_fde_64v1)); + else + layout->add_eh_frame_for_plt(this, + Eh_cie<64>::eh_frame_cie, + sizeof (Eh_cie<64>::eh_frame_cie), + glink_eh_frame_fde_64v2, + sizeof (glink_eh_frame_fde_64v2)); + } + else + { + // 32-bit .glink can use the default since the CIE return + // address reg, LR, is valid. + layout->add_eh_frame_for_plt(this, + Eh_cie<32>::eh_frame_cie, + sizeof (Eh_cie<32>::eh_frame_cie), + default_fde, + sizeof (default_fde)); + // Except where LR is used in a PIC __glink_PLTresolve. + if (parameters->options().output_is_position_independent()) + layout->add_eh_frame_for_plt(this, + Eh_cie<32>::eh_frame_cie, + sizeof (Eh_cie<32>::eh_frame_cie), + glink_eh_frame_fde_32, + sizeof (glink_eh_frame_fde_32)); + } +} + +template<int size, bool big_endian> +void +Output_data_glink<size, big_endian>::add_global_entry(const Symbol* gsym) +{ + std::pair<typename Global_entry_stub_entries::iterator, bool> p + = this->global_entry_stubs_.insert(std::make_pair(gsym, this->ge_size_)); + if (p.second) + this->ge_size_ += 16; +} + +template<int size, bool big_endian> +typename Output_data_glink<size, big_endian>::Address +Output_data_glink<size, big_endian>::find_global_entry(const Symbol* gsym) const +{ + typename Global_entry_stub_entries::const_iterator p + = this->global_entry_stubs_.find(gsym); + return p == this->global_entry_stubs_.end() ? invalid_address : p->second; +} + +template<int size, bool big_endian> +void +Output_data_glink<size, big_endian>::set_final_data_size() +{ + unsigned int count = this->targ_->plt_entry_count(); + section_size_type total = 0; + + if (count != 0) + { + if (size == 32) + { + // space for branch table + total += 4 * (count - 1); + + total += -total & 15; + total += this->pltresolve_size; + } + else + { + total += this->pltresolve_size; + + // space for branch table + total += 4 * count; + if (this->targ_->abiversion() < 2) + { + total += 4 * count; + if (count > 0x8000) + total += 4 * (count - 0x8000); + } + } + } + this->end_branch_table_ = total; + total = (total + 15) & -16; + total += this->ge_size_; + + this->set_data_size(total); +} + +// Write out plt and long branch stub code. + +template<int size, bool big_endian> +void +Stub_table<size, big_endian>::do_write(Output_file* of) +{ + if (this->plt_call_stubs_.empty() + && this->long_branch_stubs_.empty()) + return; + + const section_size_type start_off = this->offset(); + const section_size_type off = this->stub_offset(); + const section_size_type oview_size = + convert_to_section_size_type(this->data_size() - (off - start_off)); + unsigned char* const oview = of->get_output_view(off, oview_size); + unsigned char* p; + + if (size == 64) + { + const Output_data_got_powerpc<size, big_endian>* got + = this->targ_->got_section(); + Address got_os_addr = got->output_section()->address(); + + if (!this->plt_call_stubs_.empty()) + { + // The base address of the .plt section. + Address plt_base = this->targ_->plt_section()->address(); + Address iplt_base = invalid_address; + + // Write out plt call stubs. + typename Plt_stub_entries::const_iterator cs; + for (cs = this->plt_call_stubs_.begin(); + cs != this->plt_call_stubs_.end(); + ++cs) + { + bool is_iplt; + Address pltoff = this->plt_off(cs, &is_iplt); + Address plt_addr = pltoff; + if (is_iplt) + { + if (iplt_base == invalid_address) + iplt_base = this->targ_->iplt_section()->address(); + plt_addr += iplt_base; + } + else + plt_addr += plt_base; + const Powerpc_relobj<size, big_endian>* ppcobj = static_cast + <const Powerpc_relobj<size, big_endian>*>(cs->first.object_); + Address got_addr = got_os_addr + ppcobj->toc_base_offset(); + Address off = plt_addr - got_addr; + + if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) + gold_error(_("%s: linkage table error against `%s'"), + cs->first.object_->name().c_str(), + cs->first.sym_->demangled_name().c_str()); + + bool plt_load_toc = this->targ_->abiversion() < 2; + bool static_chain + = plt_load_toc && parameters->options().plt_static_chain(); + bool thread_safe + = plt_load_toc && this->targ_->plt_thread_safe(); + bool use_fake_dep = false; + Address cmp_branch_off = 0; + if (thread_safe) + { + unsigned int pltindex + = ((pltoff - this->targ_->first_plt_entry_offset()) + / this->targ_->plt_entry_size()); + Address glinkoff + = (this->targ_->glink_section()->pltresolve_size + + pltindex * 8); + if (pltindex > 32768) + glinkoff += (pltindex - 32768) * 4; + Address to + = this->targ_->glink_section()->address() + glinkoff; + Address from + = (this->stub_address() + cs->second + 24 + + 4 * (ha(off) != 0) + + 4 * (ha(off + 8 + 8 * static_chain) != ha(off)) + + 4 * static_chain); + cmp_branch_off = to - from; + use_fake_dep = cmp_branch_off + (1 << 25) >= (1 << 26); + } + + p = oview + cs->second; + if (ha(off) != 0) + { + write_insn<big_endian>(p, std_2_1 + this->targ_->stk_toc()); + p += 4; + if (plt_load_toc) + { + write_insn<big_endian>(p, addis_11_2 + ha(off)); + p += 4; + write_insn<big_endian>(p, ld_12_11 + l(off)); + p += 4; + } + else + { + write_insn<big_endian>(p, addis_12_2 + ha(off)); + p += 4; + write_insn<big_endian>(p, ld_12_12 + l(off)); + p += 4; + } + if (plt_load_toc + && ha(off + 8 + 8 * static_chain) != ha(off)) + { + write_insn<big_endian>(p, addi_11_11 + l(off)); + p += 4; + off = 0; + } + write_insn<big_endian>(p, mtctr_12); + p += 4; + if (plt_load_toc) + { + if (use_fake_dep) + { + write_insn<big_endian>(p, xor_2_12_12); + p += 4; + write_insn<big_endian>(p, add_11_11_2); + p += 4; + } + write_insn<big_endian>(p, ld_2_11 + l(off + 8)); + p += 4; + if (static_chain) + { + write_insn<big_endian>(p, ld_11_11 + l(off + 16)); + p += 4; + } + } + } + else + { + write_insn<big_endian>(p, std_2_1 + this->targ_->stk_toc()); + p += 4; + write_insn<big_endian>(p, ld_12_2 + l(off)); + p += 4; + if (plt_load_toc + && ha(off + 8 + 8 * static_chain) != ha(off)) + { + write_insn<big_endian>(p, addi_2_2 + l(off)); + p += 4; + off = 0; + } + write_insn<big_endian>(p, mtctr_12); + p += 4; + if (plt_load_toc) + { + if (use_fake_dep) + { + write_insn<big_endian>(p, xor_11_12_12); + p += 4; + write_insn<big_endian>(p, add_2_2_11); + p += 4; + } + if (static_chain) + { + write_insn<big_endian>(p, ld_11_2 + l(off + 16)); + p += 4; + } + write_insn<big_endian>(p, ld_2_2 + l(off + 8)); + p += 4; + } + } + if (thread_safe && !use_fake_dep) + { + write_insn<big_endian>(p, cmpldi_2_0); + p += 4; + write_insn<big_endian>(p, bnectr_p4); + p += 4; + write_insn<big_endian>(p, b | (cmp_branch_off & 0x3fffffc)); + } + else + write_insn<big_endian>(p, bctr); + } + } + + // Write out long branch stubs. + typename Branch_stub_entries::const_iterator bs; + for (bs = this->long_branch_stubs_.begin(); + bs != this->long_branch_stubs_.end(); + ++bs) + { + p = oview + this->plt_size_ + bs->second; + Address loc = this->stub_address() + this->plt_size_ + bs->second; + Address delta = bs->first.dest_ - loc; + if (delta + (1 << 25) < 2 << 25) + write_insn<big_endian>(p, b | (delta & 0x3fffffc)); + else + { + Address brlt_addr + = this->targ_->find_branch_lookup_table(bs->first.dest_); + gold_assert(brlt_addr != invalid_address); + brlt_addr += this->targ_->brlt_section()->address(); + Address got_addr = got_os_addr + bs->first.toc_base_off_; + Address brltoff = brlt_addr - got_addr; + if (ha(brltoff) == 0) + { + write_insn<big_endian>(p, ld_12_2 + l(brltoff)), p += 4; + } + else + { + write_insn<big_endian>(p, addis_12_2 + ha(brltoff)), p += 4; + write_insn<big_endian>(p, ld_12_12 + l(brltoff)), p += 4; + } + write_insn<big_endian>(p, mtctr_12), p += 4; + write_insn<big_endian>(p, bctr); + } + } + } + else + { + if (!this->plt_call_stubs_.empty()) + { + // The base address of the .plt section. + Address plt_base = this->targ_->plt_section()->address(); + Address iplt_base = invalid_address; + // The address of _GLOBAL_OFFSET_TABLE_. + Address g_o_t = invalid_address; + + // Write out plt call stubs. + typename Plt_stub_entries::const_iterator cs; + for (cs = this->plt_call_stubs_.begin(); + cs != this->plt_call_stubs_.end(); + ++cs) + { + bool is_iplt; + Address plt_addr = this->plt_off(cs, &is_iplt); + if (is_iplt) + { + if (iplt_base == invalid_address) + iplt_base = this->targ_->iplt_section()->address(); + plt_addr += iplt_base; + } + else + plt_addr += plt_base; + + p = oview + cs->second; + if (parameters->options().output_is_position_independent()) + { + Address got_addr; + const Powerpc_relobj<size, big_endian>* ppcobj + = (static_cast<const Powerpc_relobj<size, big_endian>*> + (cs->first.object_)); + if (ppcobj != NULL && cs->first.addend_ >= 32768) + { + unsigned int got2 = ppcobj->got2_shndx(); + got_addr = ppcobj->get_output_section_offset(got2); + gold_assert(got_addr != invalid_address); + got_addr += (ppcobj->output_section(got2)->address() + + cs->first.addend_); + } + else + { + if (g_o_t == invalid_address) + { + const Output_data_got_powerpc<size, big_endian>* got + = this->targ_->got_section(); + g_o_t = got->address() + got->g_o_t(); + } + got_addr = g_o_t; + } + + Address off = plt_addr - got_addr; + if (ha(off) == 0) + { + write_insn<big_endian>(p + 0, lwz_11_30 + l(off)); + write_insn<big_endian>(p + 4, mtctr_11); + write_insn<big_endian>(p + 8, bctr); + } + else + { + write_insn<big_endian>(p + 0, addis_11_30 + ha(off)); + write_insn<big_endian>(p + 4, lwz_11_11 + l(off)); + write_insn<big_endian>(p + 8, mtctr_11); + write_insn<big_endian>(p + 12, bctr); + } + } + else + { + write_insn<big_endian>(p + 0, lis_11 + ha(plt_addr)); + write_insn<big_endian>(p + 4, lwz_11_11 + l(plt_addr)); + write_insn<big_endian>(p + 8, mtctr_11); + write_insn<big_endian>(p + 12, bctr); + } + } + } + + // Write out long branch stubs. + typename Branch_stub_entries::const_iterator bs; + for (bs = this->long_branch_stubs_.begin(); + bs != this->long_branch_stubs_.end(); + ++bs) + { + p = oview + this->plt_size_ + bs->second; + Address loc = this->stub_address() + this->plt_size_ + bs->second; + Address delta = bs->first.dest_ - loc; + if (delta + (1 << 25) < 2 << 25) + write_insn<big_endian>(p, b | (delta & 0x3fffffc)); + else if (!parameters->options().output_is_position_independent()) + { + write_insn<big_endian>(p + 0, lis_12 + ha(bs->first.dest_)); + write_insn<big_endian>(p + 4, addi_12_12 + l(bs->first.dest_)); + write_insn<big_endian>(p + 8, mtctr_12); + write_insn<big_endian>(p + 12, bctr); + } + else + { + delta -= 8; + write_insn<big_endian>(p + 0, mflr_0); + write_insn<big_endian>(p + 4, bcl_20_31); + write_insn<big_endian>(p + 8, mflr_12); + write_insn<big_endian>(p + 12, addis_12_12 + ha(delta)); + write_insn<big_endian>(p + 16, addi_12_12 + l(delta)); + write_insn<big_endian>(p + 20, mtlr_0); + write_insn<big_endian>(p + 24, mtctr_12); + write_insn<big_endian>(p + 28, bctr); + } + } + } +} + +// Write out .glink. + +template<int size, bool big_endian> +void +Output_data_glink<size, big_endian>::do_write(Output_file* of) +{ + const section_size_type off = this->offset(); + const section_size_type oview_size = + convert_to_section_size_type(this->data_size()); + unsigned char* const oview = of->get_output_view(off, oview_size); + unsigned char* p; + + // The base address of the .plt section. + typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; + Address plt_base = this->targ_->plt_section()->address(); + + if (size == 64) + { + if (this->end_branch_table_ != 0) + { + // Write pltresolve stub. + p = oview; + Address after_bcl = this->address() + 16; + Address pltoff = plt_base - after_bcl; + + elfcpp::Swap<64, big_endian>::writeval(p, pltoff), p += 8; + + if (this->targ_->abiversion() < 2) + { + write_insn<big_endian>(p, mflr_12), p += 4; + write_insn<big_endian>(p, bcl_20_31), p += 4; + write_insn<big_endian>(p, mflr_11), p += 4; + write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4; + write_insn<big_endian>(p, mtlr_12), p += 4; + write_insn<big_endian>(p, add_11_2_11), p += 4; + write_insn<big_endian>(p, ld_12_11 + 0), p += 4; + write_insn<big_endian>(p, ld_2_11 + 8), p += 4; + write_insn<big_endian>(p, mtctr_12), p += 4; + write_insn<big_endian>(p, ld_11_11 + 16), p += 4; + } + else + { + write_insn<big_endian>(p, mflr_0), p += 4; + write_insn<big_endian>(p, bcl_20_31), p += 4; + write_insn<big_endian>(p, mflr_11), p += 4; + write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4; + write_insn<big_endian>(p, mtlr_0), p += 4; + write_insn<big_endian>(p, sub_12_12_11), p += 4; + write_insn<big_endian>(p, add_11_2_11), p += 4; + write_insn<big_endian>(p, addi_0_12 + l(-48)), p += 4; + write_insn<big_endian>(p, ld_12_11 + 0), p += 4; + write_insn<big_endian>(p, srdi_0_0_2), p += 4; + write_insn<big_endian>(p, mtctr_12), p += 4; + write_insn<big_endian>(p, ld_11_11 + 8), p += 4; + } + write_insn<big_endian>(p, bctr), p += 4; + while (p < oview + this->pltresolve_size) + write_insn<big_endian>(p, nop), p += 4; + + // Write lazy link call stubs. + uint32_t indx = 0; + while (p < oview + this->end_branch_table_) + { + if (this->targ_->abiversion() < 2) + { + if (indx < 0x8000) + { + write_insn<big_endian>(p, li_0_0 + indx), p += 4; + } + else + { + write_insn<big_endian>(p, lis_0_0 + hi(indx)), p += 4; + write_insn<big_endian>(p, ori_0_0_0 + l(indx)), p += 4; + } + } + uint32_t branch_off = 8 - (p - oview); + write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4; + indx++; + } + } + + Address plt_base = this->targ_->plt_section()->address(); + Address iplt_base = invalid_address; + unsigned int global_entry_off = (this->end_branch_table_ + 15) & -16; + Address global_entry_base = this->address() + global_entry_off; + typename Global_entry_stub_entries::const_iterator ge; + for (ge = this->global_entry_stubs_.begin(); + ge != this->global_entry_stubs_.end(); + ++ge) + { + p = oview + global_entry_off + ge->second; + Address plt_addr = ge->first->plt_offset(); + if (ge->first->type() == elfcpp::STT_GNU_IFUNC + && ge->first->can_use_relative_reloc(false)) + { + if (iplt_base == invalid_address) + iplt_base = this->targ_->iplt_section()->address(); + plt_addr += iplt_base; + } + else + plt_addr += plt_base; + Address my_addr = global_entry_base + ge->second; + Address off = plt_addr - my_addr; + + if (off + 0x80008000 > 0xffffffff || (off & 3) != 0) + gold_error(_("%s: linkage table error against `%s'"), + ge->first->object()->name().c_str(), + ge->first->demangled_name().c_str()); + + write_insn<big_endian>(p, addis_12_12 + ha(off)), p += 4; + write_insn<big_endian>(p, ld_12_12 + l(off)), p += 4; + write_insn<big_endian>(p, mtctr_12), p += 4; + write_insn<big_endian>(p, bctr); + } + } + else + { + const Output_data_got_powerpc<size, big_endian>* got + = this->targ_->got_section(); + // The address of _GLOBAL_OFFSET_TABLE_. + Address g_o_t = got->address() + got->g_o_t(); + + // Write out pltresolve branch table. + p = oview; + unsigned int the_end = oview_size - this->pltresolve_size; + unsigned char* end_p = oview + the_end; + while (p < end_p - 8 * 4) + write_insn<big_endian>(p, b + end_p - p), p += 4; + while (p < end_p) + write_insn<big_endian>(p, nop), p += 4; + + // Write out pltresolve call stub. + if (parameters->options().output_is_position_independent()) + { + Address res0_off = 0; + Address after_bcl_off = the_end + 12; + Address bcl_res0 = after_bcl_off - res0_off; + + write_insn<big_endian>(p + 0, addis_11_11 + ha(bcl_res0)); + write_insn<big_endian>(p + 4, mflr_0); + write_insn<big_endian>(p + 8, bcl_20_31); + write_insn<big_endian>(p + 12, addi_11_11 + l(bcl_res0)); + write_insn<big_endian>(p + 16, mflr_12); + write_insn<big_endian>(p + 20, mtlr_0); + write_insn<big_endian>(p + 24, sub_11_11_12); + + Address got_bcl = g_o_t + 4 - (after_bcl_off + this->address()); + + write_insn<big_endian>(p + 28, addis_12_12 + ha(got_bcl)); + if (ha(got_bcl) == ha(got_bcl + 4)) + { + write_insn<big_endian>(p + 32, lwz_0_12 + l(got_bcl)); + write_insn<big_endian>(p + 36, lwz_12_12 + l(got_bcl + 4)); + } + else + { + write_insn<big_endian>(p + 32, lwzu_0_12 + l(got_bcl)); + write_insn<big_endian>(p + 36, lwz_12_12 + 4); + } + write_insn<big_endian>(p + 40, mtctr_0); + write_insn<big_endian>(p + 44, add_0_11_11); + write_insn<big_endian>(p + 48, add_11_0_11); + write_insn<big_endian>(p + 52, bctr); + write_insn<big_endian>(p + 56, nop); + write_insn<big_endian>(p + 60, nop); + } + else + { + Address res0 = this->address(); + + write_insn<big_endian>(p + 0, lis_12 + ha(g_o_t + 4)); + write_insn<big_endian>(p + 4, addis_11_11 + ha(-res0)); + if (ha(g_o_t + 4) == ha(g_o_t + 8)) + write_insn<big_endian>(p + 8, lwz_0_12 + l(g_o_t + 4)); + else + write_insn<big_endian>(p + 8, lwzu_0_12 + l(g_o_t + 4)); + write_insn<big_endian>(p + 12, addi_11_11 + l(-res0)); + write_insn<big_endian>(p + 16, mtctr_0); + write_insn<big_endian>(p + 20, add_0_11_11); + if (ha(g_o_t + 4) == ha(g_o_t + 8)) + write_insn<big_endian>(p + 24, lwz_12_12 + l(g_o_t + 8)); + else + write_insn<big_endian>(p + 24, lwz_12_12 + 4); + write_insn<big_endian>(p + 28, add_11_0_11); + write_insn<big_endian>(p + 32, bctr); + write_insn<big_endian>(p + 36, nop); + write_insn<big_endian>(p + 40, nop); + write_insn<big_endian>(p + 44, nop); + write_insn<big_endian>(p + 48, nop); + write_insn<big_endian>(p + 52, nop); + write_insn<big_endian>(p + 56, nop); + write_insn<big_endian>(p + 60, nop); + } + p += 64; + } + + of->write_output_view(off, oview_size, oview); +} + + +// A class to handle linker generated save/restore functions. + +template<int size, bool big_endian> +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<bool big_endian> +static unsigned char* +savegpr0(unsigned char* p, int r) +{ + uint32_t insn = std_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn<big_endian>(p, insn); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +savegpr0_tail(unsigned char* p, int r) +{ + p = savegpr0<big_endian>(p, r); + uint32_t insn = std_0_1 + 16; + write_insn<big_endian>(p, insn); + p = p + 4; + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restgpr0(unsigned char* p, int r) +{ + uint32_t insn = ld_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn<big_endian>(p, insn); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restgpr0_tail(unsigned char* p, int r) +{ + uint32_t insn = ld_0_1 + 16; + write_insn<big_endian>(p, insn); + p = p + 4; + p = restgpr0<big_endian>(p, r); + write_insn<big_endian>(p, mtlr_0); + p = p + 4; + if (r == 29) + { + p = restgpr0<big_endian>(p, 30); + p = restgpr0<big_endian>(p, 31); + } + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +savegpr1(unsigned char* p, int r) +{ + uint32_t insn = std_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn<big_endian>(p, insn); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +savegpr1_tail(unsigned char* p, int r) +{ + p = savegpr1<big_endian>(p, r); + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restgpr1(unsigned char* p, int r) +{ + uint32_t insn = ld_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn<big_endian>(p, insn); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restgpr1_tail(unsigned char* p, int r) +{ + p = restgpr1<big_endian>(p, r); + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +savefpr(unsigned char* p, int r) +{ + uint32_t insn = stfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn<big_endian>(p, insn); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +savefpr0_tail(unsigned char* p, int r) +{ + p = savefpr<big_endian>(p, r); + write_insn<big_endian>(p, std_0_1 + 16); + p = p + 4; + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restfpr(unsigned char* p, int r) +{ + uint32_t insn = lfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn<big_endian>(p, insn); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restfpr0_tail(unsigned char* p, int r) +{ + write_insn<big_endian>(p, ld_0_1 + 16); + p = p + 4; + p = restfpr<big_endian>(p, r); + write_insn<big_endian>(p, mtlr_0); + p = p + 4; + if (r == 29) + { + p = restfpr<big_endian>(p, 30); + p = restfpr<big_endian>(p, 31); + } + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +savefpr1_tail(unsigned char* p, int r) +{ + p = savefpr<big_endian>(p, r); + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restfpr1_tail(unsigned char* p, int r) +{ + p = restfpr<big_endian>(p, r); + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +savevr(unsigned char* p, int r) +{ + uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; + write_insn<big_endian>(p, insn); + p = p + 4; + insn = stvx_0_12_0 + (r << 21); + write_insn<big_endian>(p, insn); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +savevr_tail(unsigned char* p, int r) +{ + p = savevr<big_endian>(p, r); + write_insn<big_endian>(p, blr); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restvr(unsigned char* p, int r) +{ + uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; + write_insn<big_endian>(p, insn); + p = p + 4; + insn = lvx_0_12_0 + (r << 21); + write_insn<big_endian>(p, insn); + return p + 4; +} + +template<bool big_endian> +static unsigned char* +restvr_tail(unsigned char* p, int r) +{ + p = restvr<big_endian>(p, r); + write_insn<big_endian>(p, blr); + return p + 4; +} + + +template<int size, bool big_endian> +Output_data_save_res<size, big_endian>::Output_data_save_res( + Symbol_table* symtab) + : Output_section_data_build(4), + contents_(NULL) +{ + this->savres_define(symtab, + "_savegpr0_", 14, 31, + savegpr0<big_endian>, savegpr0_tail<big_endian>); + this->savres_define(symtab, + "_restgpr0_", 14, 29, + restgpr0<big_endian>, restgpr0_tail<big_endian>); + this->savres_define(symtab, + "_restgpr0_", 30, 31, + restgpr0<big_endian>, restgpr0_tail<big_endian>); + this->savres_define(symtab, + "_savegpr1_", 14, 31, + savegpr1<big_endian>, savegpr1_tail<big_endian>); + this->savres_define(symtab, + "_restgpr1_", 14, 31, + restgpr1<big_endian>, restgpr1_tail<big_endian>); + this->savres_define(symtab, + "_savefpr_", 14, 31, + savefpr<big_endian>, savefpr0_tail<big_endian>); + this->savres_define(symtab, + "_restfpr_", 14, 29, + restfpr<big_endian>, restfpr0_tail<big_endian>); + this->savres_define(symtab, + "_restfpr_", 30, 31, + restfpr<big_endian>, restfpr0_tail<big_endian>); + this->savres_define(symtab, + "._savef", 14, 31, + savefpr<big_endian>, savefpr1_tail<big_endian>); + this->savres_define(symtab, + "._restf", 14, 31, + restfpr<big_endian>, restfpr1_tail<big_endian>); + this->savres_define(symtab, + "_savevr_", 20, 31, + savevr<big_endian>, savevr_tail<big_endian>); + this->savres_define(symtab, + "_restvr_", 20, 31, + restvr<big_endian>, restvr_tail<big_endian>); +} + +template<int size, bool big_endian> +void +Output_data_save_res<size, big_endian>::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]; + + section_size_type 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); + section_size_type 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<int size, bool big_endian> +void +Output_data_save_res<size, big_endian>::do_write(Output_file* of) +{ + const section_size_type 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<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::make_glink_section(Layout* layout) +{ + if (this->glink_ == NULL) + { + this->glink_ = new Output_data_glink<size, big_endian>(this); + this->glink_->add_eh_frame(layout); + layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, + elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, + this->glink_, ORDER_TEXT, false); + } +} + +// Create a PLT entry for a global symbol. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab, + Layout* layout, + Symbol* gsym) +{ + if (gsym->type() == elfcpp::STT_GNU_IFUNC + && gsym->can_use_relative_reloc(false)) + { + if (this->iplt_ == NULL) + this->make_iplt_section(symtab, layout); + this->iplt_->add_ifunc_entry(gsym); + } + else + { + if (this->plt_ == NULL) + this->make_plt_section(symtab, layout); + this->plt_->add_entry(gsym); + } +} + +// Make a PLT entry for a local STT_GNU_IFUNC symbol. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::make_local_ifunc_plt_entry( + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file<size, big_endian>* relobj, + unsigned int r_sym) +{ + if (this->iplt_ == NULL) + this->make_iplt_section(symtab, layout); + this->iplt_->add_local_ifunc_entry(relobj, r_sym); +} + +// Return the number of entries in the PLT. + +template<int size, bool big_endian> +unsigned int +Target_powerpc<size, big_endian>::plt_entry_count() const +{ + if (this->plt_ == NULL) + return 0; + return this->plt_->entry_count(); +} + +// Create a GOT entry for local dynamic __tls_get_addr calls. + +template<int size, bool big_endian> +unsigned int +Target_powerpc<size, big_endian>::tlsld_got_offset( + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file<size, big_endian>* object) +{ + if (this->tlsld_got_offset_ == -1U) + { + gold_assert(symtab != NULL && layout != NULL && object != NULL); + Reloc_section* rela_dyn = this->rela_dyn_section(layout); + Output_data_got_powerpc<size, big_endian>* got + = this->got_section(symtab, layout); + unsigned int got_offset = got->add_constant_pair(0, 0); + rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got, + got_offset, 0); + this->tlsld_got_offset_ = got_offset; + } + return this->tlsld_got_offset_; +} + +// Get the Reference_flags for a particular relocation. + +template<int size, bool big_endian> +int +Target_powerpc<size, big_endian>::Scan::get_reference_flags( + unsigned int r_type, + const Target_powerpc* target) +{ + int ref = 0; + + 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. + 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_ADDR16: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_POWERPC_ADDR16_LO: + case elfcpp::R_POWERPC_ADDR16_HI: + case elfcpp::R_POWERPC_ADDR16_HA: + ref = Symbol::ABSOLUTE_REF; + break; + + case elfcpp::R_POWERPC_ADDR24: + case elfcpp::R_POWERPC_ADDR14: + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: + ref = Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF; + break; + + 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: + ref = Symbol::RELATIVE_REF; + break; + + 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: + ref = Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; + 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: + 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. + ref = Symbol::ABSOLUTE_REF; + break; + + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_TLS: + ref = Symbol::TLS_REF; + 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: + default: + // Not expected. We will give an error later. + break; + } + + if (size == 64 && target->abiversion() < 2) + ref |= Symbol::FUNC_DESC_ABI; + return ref; +} + +// Report an unsupported relocation against a local symbol. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local( + Sized_relobj_file<size, big_endian>* object, + unsigned int r_type) +{ + gold_error(_("%s: unsupported reloc %u against local symbol"), + object->name().c_str(), r_type); +} + +// We are about to emit a dynamic relocation of type R_TYPE. If the +// dynamic linker does not support it, issue an error. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object, + unsigned int r_type) +{ + gold_assert(r_type != elfcpp::R_POWERPC_NONE); + + // These are the relocation types supported by glibc for both 32-bit + // and 64-bit powerpc. + switch (r_type) + { + case elfcpp::R_POWERPC_NONE: + case elfcpp::R_POWERPC_RELATIVE: + case elfcpp::R_POWERPC_GLOB_DAT: + case elfcpp::R_POWERPC_DTPMOD: + case elfcpp::R_POWERPC_DTPREL: + case elfcpp::R_POWERPC_TPREL: + case elfcpp::R_POWERPC_JMP_SLOT: + case elfcpp::R_POWERPC_COPY: + case elfcpp::R_POWERPC_IRELATIVE: + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_UADDR32: + case elfcpp::R_POWERPC_ADDR24: + case elfcpp::R_POWERPC_ADDR16: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_POWERPC_ADDR16_LO: + case elfcpp::R_POWERPC_ADDR16_HI: + case elfcpp::R_POWERPC_ADDR16_HA: + case elfcpp::R_POWERPC_ADDR14: + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: + case elfcpp::R_POWERPC_REL32: + case elfcpp::R_POWERPC_REL24: + case elfcpp::R_POWERPC_TPREL16: + case elfcpp::R_POWERPC_TPREL16_LO: + case elfcpp::R_POWERPC_TPREL16_HI: + case elfcpp::R_POWERPC_TPREL16_HA: + return; + + default: + break; + } + + if (size == 64) + { + switch (r_type) + { + // These are the relocation types supported only on 64-bit. + case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_PPC64_UADDR64: + case elfcpp::R_PPC64_JMP_IREL: + case elfcpp::R_PPC64_ADDR16_DS: + case elfcpp::R_PPC64_ADDR16_LO_DS: + case elfcpp::R_PPC64_ADDR16_HIGH: + case elfcpp::R_PPC64_ADDR16_HIGHA: + 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_HIGH: + case elfcpp::R_PPC64_TPREL16_HIGHA: + case elfcpp::R_PPC64_TPREL16_HIGHER: + case elfcpp::R_PPC64_TPREL16_HIGHEST: + case elfcpp::R_PPC64_TPREL16_HIGHERA: + case elfcpp::R_PPC64_TPREL16_HIGHESTA: + return; + + default: + break; + } + } + else + { + switch (r_type) + { + // These are the relocation types supported only on 32-bit. + // ??? glibc ld.so doesn't need to support these. + case elfcpp::R_POWERPC_DTPREL16: + case elfcpp::R_POWERPC_DTPREL16_LO: + case elfcpp::R_POWERPC_DTPREL16_HI: + case elfcpp::R_POWERPC_DTPREL16_HA: + return; + + default: + break; + } + } + + // This prevents us from issuing more than one error per reloc + // section. But we can still wind up issuing more than one + // error per object file. + if (this->issued_non_pic_error_) + return; + gold_assert(parameters->options().output_is_position_independent()); + object->error(_("requires unsupported dynamic reloc; " + "recompile with -fPIC")); + this->issued_non_pic_error_ = true; + return; +} + +// Return whether we need to make a PLT entry for a relocation of the +// given type against a STT_GNU_IFUNC symbol. + +template<int size, bool big_endian> +bool +Target_powerpc<size, big_endian>::Scan::reloc_needs_plt_for_ifunc( + Target_powerpc<size, big_endian>* target, + Sized_relobj_file<size, big_endian>* object, + unsigned int r_type, + bool report_err) +{ + // In non-pic code any reference will resolve to the plt call stub + // for the ifunc symbol. + if ((size == 32 || target->abiversion() >= 2) + && !parameters->options().output_is_position_independent()) + return true; + + switch (r_type) + { + // Word size refs from data sections are OK, but don't need a PLT entry. + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_UADDR32: + if (size == 32) + return false; + break; + + case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_PPC64_UADDR64: + if (size == 64) + return false; + break; + + // GOT refs are good, but also don't need a PLT entry. + 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 false; + + // Function calls are good, and these do need a PLT entry. + 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. + if (report_err) + gold_error(_("%s: unsupported reloc %u for IFUNC symbol"), + object->name().c_str(), r_type); + return false; +} + +// Scan a relocation for a local symbol. + +template<int size, bool big_endian> +inline void +Target_powerpc<size, big_endian>::Scan::local( + Symbol_table* symtab, + Layout* layout, + Target_powerpc<size, big_endian>* target, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela<size, big_endian>& reloc, + unsigned int r_type, + const elfcpp::Sym<size, big_endian>& lsym, + bool is_discarded) +{ + this->maybe_skip_tls_get_addr_call(r_type, NULL); + + if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) + { + this->expect_tls_get_addr_call(); + const tls::Tls_optimization tls_type = target->optimize_tls_gd(true); + if (tls_type != tls::TLSOPT_NONE) + this->skip_next_tls_get_addr_call(); + } + else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) + { + this->expect_tls_get_addr_call(); + const tls::Tls_optimization tls_type = target->optimize_tls_ld(); + if (tls_type != tls::TLSOPT_NONE) + this->skip_next_tls_get_addr_call(); + } + + Powerpc_relobj<size, big_endian>* ppc_object + = static_cast<Powerpc_relobj<size, big_endian>*>(object); + + if (is_discarded) + { + if (size == 64 + && data_shndx == ppc_object->opd_shndx() + && r_type == elfcpp::R_PPC64_ADDR64) + ppc_object->set_opd_discard(reloc.get_r_offset()); + return; + } + + // A local STT_GNU_IFUNC symbol may require a PLT entry. + bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; + if (is_ifunc && this->reloc_needs_plt_for_ifunc(target, object, r_type, true)) + { + unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, r_sym, reloc.get_r_addend()); + target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); + } + + 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_POWERPC_TLS: + break; + + case elfcpp::R_PPC64_TOC: + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + if (parameters->options().output_is_position_independent()) + { + Address off = reloc.get_r_offset(); + if (size == 64 + && target->abiversion() < 2 + && data_shndx == ppc_object->opd_shndx() + && ppc_object->get_opd_discard(off - 8)) + break; + + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + Powerpc_relobj<size, big_endian>* symobj = ppc_object; + rela_dyn->add_output_section_relative(got->output_section(), + elfcpp::R_POWERPC_RELATIVE, + output_section, + object, data_shndx, off, + symobj->toc_base_offset()); + } + } + break; + + case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_PPC64_UADDR64: + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_UADDR32: + case elfcpp::R_POWERPC_ADDR24: + case elfcpp::R_POWERPC_ADDR16: + case elfcpp::R_POWERPC_ADDR16_LO: + case elfcpp::R_POWERPC_ADDR16_HI: + case elfcpp::R_POWERPC_ADDR16_HA: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_PPC64_ADDR16_HIGH: + case elfcpp::R_PPC64_ADDR16_HIGHA: + 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 && target->abiversion() < 2)) + { + Reloc_section* rela_dyn = target->rela_dyn_section(symtab, layout, + is_ifunc); + unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); + if ((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32) + || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64)) + { + unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE + : elfcpp::R_POWERPC_RELATIVE); + rela_dyn->add_local_relative(object, r_sym, dynrel, + output_section, data_shndx, + reloc.get_r_offset(), + reloc.get_r_addend(), false); + } + else if (lsym.get_st_type() != elfcpp::STT_SECTION) + { + check_non_pic(object, r_type); + rela_dyn->add_local(object, r_sym, r_type, output_section, + data_shndx, reloc.get_r_offset(), + reloc.get_r_addend()); + } + else + { + gold_assert(lsym.get_st_value() == 0); + unsigned int shndx = lsym.get_st_shndx(); + bool is_ordinary; + shndx = object->adjust_sym_shndx(r_sym, shndx, + &is_ordinary); + if (!is_ordinary) + object->error(_("section symbol %u has bad shndx %u"), + r_sym, shndx); + else + rela_dyn->add_local_section(object, shndx, r_type, + output_section, data_shndx, + reloc.get_r_offset()); + } + } + break; + + case elfcpp::R_POWERPC_REL24: + case elfcpp::R_PPC_PLTREL24: + case elfcpp::R_PPC_LOCAL24PC: + case elfcpp::R_POWERPC_REL14: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + if (!is_ifunc) + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()), + reloc.get_r_addend()); + break; + + case elfcpp::R_PPC64_REL64: + case elfcpp::R_POWERPC_REL32: + 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_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: + 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_PPC64_TPREL16_DS: + case elfcpp::R_PPC64_TPREL16_LO_DS: + case elfcpp::R_PPC64_TPREL16_HIGH: + case elfcpp::R_PPC64_TPREL16_HIGHA: + case elfcpp::R_PPC64_TPREL16_HIGHER: + case elfcpp::R_PPC64_TPREL16_HIGHERA: + case elfcpp::R_PPC64_TPREL16_HIGHEST: + case elfcpp::R_PPC64_TPREL16_HIGHESTA: + 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_PPC64_DTPREL16_DS: + case elfcpp::R_PPC64_DTPREL16_LO_DS: + case elfcpp::R_PPC64_DTPREL16_HIGH: + case elfcpp::R_PPC64_DTPREL16_HIGHA: + case elfcpp::R_PPC64_DTPREL16_HIGHER: + case elfcpp::R_PPC64_DTPREL16_HIGHERA: + case elfcpp::R_PPC64_DTPREL16_HIGHEST: + case elfcpp::R_PPC64_DTPREL16_HIGHESTA: + case elfcpp::R_PPC64_TLSGD: + case elfcpp::R_PPC64_TLSLD: + case elfcpp::R_PPC64_ADDR64_LOCAL: + break; + + case elfcpp::R_POWERPC_GOT16: + case elfcpp::R_POWERPC_GOT16_LO: + case elfcpp::R_POWERPC_GOT16_HI: + case elfcpp::R_POWERPC_GOT16_HA: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_GOT16_LO_DS: + { + // The symbol requires a GOT entry. + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); + + if (!parameters->options().output_is_position_independent()) + { + if ((size == 32 && is_ifunc) + || (size == 64 && target->abiversion() >= 2)) + 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(symtab, layout, + is_ifunc); + unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE + : elfcpp::R_POWERPC_RELATIVE); + rela_dyn->add_local_relative(object, r_sym, dynrel, + got, off, 0, false); + } + } + break; + + case elfcpp::R_PPC64_TOC16: + case elfcpp::R_PPC64_TOC16_LO: + case elfcpp::R_PPC64_TOC16_HI: + case elfcpp::R_PPC64_TOC16_HA: + case elfcpp::R_PPC64_TOC16_DS: + case elfcpp::R_PPC64_TOC16_LO_DS: + // We need a GOT section. + target->got_section(symtab, layout); + break; + + case elfcpp::R_POWERPC_GOT_TLSGD16: + case elfcpp::R_POWERPC_GOT_TLSGD16_LO: + case elfcpp::R_POWERPC_GOT_TLSGD16_HI: + case elfcpp::R_POWERPC_GOT_TLSGD16_HA: + { + const tls::Tls_optimization tls_type = target->optimize_tls_gd(true); + if (tls_type == tls::TLSOPT_NONE) + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + got->add_local_tls_pair(object, r_sym, GOT_TYPE_TLSGD, + rela_dyn, elfcpp::R_POWERPC_DTPMOD); + } + else if (tls_type == tls::TLSOPT_TO_LE) + { + // no GOT relocs needed for Local Exec. + } + else + gold_unreachable(); + } + break; + + case elfcpp::R_POWERPC_GOT_TLSLD16: + case elfcpp::R_POWERPC_GOT_TLSLD16_LO: + case elfcpp::R_POWERPC_GOT_TLSLD16_HI: + case elfcpp::R_POWERPC_GOT_TLSLD16_HA: + { + const tls::Tls_optimization tls_type = target->optimize_tls_ld(); + if (tls_type == tls::TLSOPT_NONE) + target->tlsld_got_offset(symtab, layout, object); + else if (tls_type == tls::TLSOPT_TO_LE) + { + // no GOT relocs needed for Local Exec. + if (parameters->options().emit_relocs()) + { + Output_section* os = layout->tls_segment()->first_section(); + gold_assert(os != NULL); + os->set_needs_symtab_index(); + } + } + else + gold_unreachable(); + } + break; + + case elfcpp::R_POWERPC_GOT_DTPREL16: + case elfcpp::R_POWERPC_GOT_DTPREL16_LO: + case elfcpp::R_POWERPC_GOT_DTPREL16_HI: + case elfcpp::R_POWERPC_GOT_DTPREL16_HA: + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); + got->add_local_tls(object, r_sym, GOT_TYPE_DTPREL); + } + break; + + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_GOT_TPREL16_LO: + case elfcpp::R_POWERPC_GOT_TPREL16_HI: + case elfcpp::R_POWERPC_GOT_TPREL16_HA: + { + const tls::Tls_optimization tls_type = target->optimize_tls_ie(true); + if (tls_type == tls::TLSOPT_NONE) + { + unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); + if (!object->local_has_got_offset(r_sym, GOT_TYPE_TPREL)) + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + unsigned int off = got->add_constant(0); + object->set_local_got_offset(r_sym, GOT_TYPE_TPREL, off); + + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + rela_dyn->add_symbolless_local_addend(object, r_sym, + elfcpp::R_POWERPC_TPREL, + got, off, 0); + } + } + 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; + } + + switch (r_type) + { + case elfcpp::R_POWERPC_GOT_TLSLD16: + case elfcpp::R_POWERPC_GOT_TLSGD16: + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_GOT_DTPREL16: + case elfcpp::R_POWERPC_GOT16: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_TOC16: + case elfcpp::R_PPC64_TOC16_DS: + ppc_object->set_has_small_toc_reloc(); + default: + break; + } +} + +// Report an unsupported relocation against a global symbol. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global( + Sized_relobj_file<size, big_endian>* object, + unsigned int r_type, + Symbol* gsym) +{ + gold_error(_("%s: unsupported reloc %u against global symbol %s"), + object->name().c_str(), r_type, gsym->demangled_name().c_str()); +} + +// Scan a relocation for a global symbol. + +template<int size, bool big_endian> +inline void +Target_powerpc<size, big_endian>::Scan::global( + Symbol_table* symtab, + Layout* layout, + Target_powerpc<size, big_endian>* target, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela<size, big_endian>& reloc, + unsigned int r_type, + Symbol* gsym) +{ + if (this->maybe_skip_tls_get_addr_call(r_type, gsym) == Track_tls::SKIP) + return; + + if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) + { + this->expect_tls_get_addr_call(); + 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) + this->skip_next_tls_get_addr_call(); + } + else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) + { + this->expect_tls_get_addr_call(); + const tls::Tls_optimization tls_type = target->optimize_tls_ld(); + if (tls_type != tls::TLSOPT_NONE) + this->skip_next_tls_get_addr_call(); + } + + Powerpc_relobj<size, big_endian>* ppc_object + = static_cast<Powerpc_relobj<size, big_endian>*>(object); + + // A STT_GNU_IFUNC symbol may require a PLT entry. + bool is_ifunc = gsym->type() == elfcpp::STT_GNU_IFUNC; + bool pushed_ifunc = false; + if (is_ifunc && this->reloc_needs_plt_for_ifunc(target, object, r_type, true)) + { + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()), + reloc.get_r_addend()); + target->make_plt_entry(symtab, layout, gsym); + pushed_ifunc = true; + } + + 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_POWERPC_TLS: + break; + + case elfcpp::R_PPC64_TOC: + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + if (parameters->options().output_is_position_independent()) + { + Address off = reloc.get_r_offset(); + if (size == 64 + && data_shndx == ppc_object->opd_shndx() + && ppc_object->get_opd_discard(off - 8)) + break; + + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + Powerpc_relobj<size, big_endian>* symobj = ppc_object; + if (data_shndx != ppc_object->opd_shndx()) + symobj = static_cast + <Powerpc_relobj<size, big_endian>*>(gsym->object()); + rela_dyn->add_output_section_relative(got->output_section(), + elfcpp::R_POWERPC_RELATIVE, + output_section, + object, data_shndx, off, + symobj->toc_base_offset()); + } + } + break; + + case elfcpp::R_PPC64_ADDR64: + if (size == 64 + && target->abiversion() < 2 + && 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_HIGH: + case elfcpp::R_PPC64_ADDR16_HIGHA: + 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()) + { + // 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. + bool need_ifunc_plt = false; + if ((size == 32 || target->abiversion() >= 2) + && gsym->is_from_dynobj() + && !parameters->options().output_is_position_independent()) + { + gsym->set_needs_dynsym_value(); + need_ifunc_plt = true; + } + if (!is_ifunc || (!pushed_ifunc && need_ifunc_plt)) + { + target->push_branch(ppc_object, data_shndx, + reloc.get_r_offset(), r_type, + elfcpp::elf_r_sym<size>(reloc.get_r_info()), + reloc.get_r_addend()); + target->make_plt_entry(symtab, layout, gsym); + } + } + // Make a dynamic relocation if necessary. + if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type, target)) + || (size == 64 && is_ifunc && target->abiversion() < 2)) + { + if (!parameters->options().output_is_position_independent() + && 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 + && target->abiversion() >= 2)) + && gsym->can_use_relative_reloc(false) + && !(gsym->visibility() == elfcpp::STV_PROTECTED + && parameters->options().shared())) + || (size == 64 + && r_type == elfcpp::R_PPC64_ADDR64 + && target->abiversion() < 2 + && (gsym->can_use_relative_reloc(false) + || data_shndx == ppc_object->opd_shndx()))) + { + Reloc_section* rela_dyn + = target->rela_dyn_section(symtab, layout, is_ifunc); + unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE + : elfcpp::R_POWERPC_RELATIVE); + 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(symtab, layout, is_ifunc); + 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 (!is_ifunc) + { + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, + elfcpp::elf_r_sym<size>(reloc.get_r_info()), + reloc.get_r_addend()); + if (gsym->needs_plt_entry() + || (!gsym->final_value_is_known() + && (gsym->is_undefined() + || gsym->is_from_dynobj() + || gsym->is_preemptible()))) + target->make_plt_entry(symtab, layout, gsym); + } + // Fall thru + + case elfcpp::R_PPC64_REL64: + case elfcpp::R_POWERPC_REL32: + // Make a dynamic relocation if necessary. + if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type, target))) + { + if (!parameters->options().output_is_position_independent() + && 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(symtab, layout, is_ifunc); + 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_REL14: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + if (!is_ifunc) + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()), + 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_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: + 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_PPC64_TPREL16_DS: + case elfcpp::R_PPC64_TPREL16_LO_DS: + case elfcpp::R_PPC64_TPREL16_HIGH: + case elfcpp::R_PPC64_TPREL16_HIGHA: + case elfcpp::R_PPC64_TPREL16_HIGHER: + case elfcpp::R_PPC64_TPREL16_HIGHERA: + case elfcpp::R_PPC64_TPREL16_HIGHEST: + case elfcpp::R_PPC64_TPREL16_HIGHESTA: + 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_PPC64_DTPREL16_DS: + case elfcpp::R_PPC64_DTPREL16_LO_DS: + case elfcpp::R_PPC64_DTPREL16_HIGH: + case elfcpp::R_PPC64_DTPREL16_HIGHA: + case elfcpp::R_PPC64_DTPREL16_HIGHER: + case elfcpp::R_PPC64_DTPREL16_HIGHERA: + case elfcpp::R_PPC64_DTPREL16_HIGHEST: + case elfcpp::R_PPC64_DTPREL16_HIGHESTA: + case elfcpp::R_PPC64_TLSGD: + case elfcpp::R_PPC64_TLSLD: + case elfcpp::R_PPC64_ADDR64_LOCAL: + break; + + case elfcpp::R_POWERPC_GOT16: + case elfcpp::R_POWERPC_GOT16_LO: + case elfcpp::R_POWERPC_GOT16_HI: + case elfcpp::R_POWERPC_GOT16_HA: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_GOT16_LO_DS: + { + // The symbol requires a GOT entry. + Output_data_got_powerpc<size, big_endian>* got; + + got = target->got_section(symtab, layout); + if (gsym->final_value_is_known()) + { + if ((size == 32 && is_ifunc) + || (size == 64 && target->abiversion() >= 2)) + 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(symtab, layout, is_ifunc); + + if (gsym->can_use_relative_reloc(false) + && !((size == 32 + || target->abiversion() >= 2) + && gsym->visibility() == elfcpp::STV_PROTECTED + && parameters->options().shared())) + { + unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE + : elfcpp::R_POWERPC_RELATIVE); + rela_dyn->add_global_relative(gsym, dynrel, got, off, 0, false); + } + else + { + unsigned int dynrel = elfcpp::R_POWERPC_GLOB_DAT; + rela_dyn->add_global(gsym, dynrel, got, off, 0); + } + } + } + break; + + case elfcpp::R_PPC64_TOC16: + case elfcpp::R_PPC64_TOC16_LO: + case elfcpp::R_PPC64_TOC16_HI: + case elfcpp::R_PPC64_TOC16_HA: + case elfcpp::R_PPC64_TOC16_DS: + case elfcpp::R_PPC64_TOC16_LO_DS: + // We need a GOT section. + target->got_section(symtab, layout); + break; + + case elfcpp::R_POWERPC_GOT_TLSGD16: + case elfcpp::R_POWERPC_GOT_TLSGD16_LO: + case elfcpp::R_POWERPC_GOT_TLSGD16_HI: + case elfcpp::R_POWERPC_GOT_TLSGD16_HA: + { + const bool final = gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); + if (tls_type == tls::TLSOPT_NONE) + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + got->add_global_pair_with_rel(gsym, GOT_TYPE_TLSGD, rela_dyn, + elfcpp::R_POWERPC_DTPMOD, + elfcpp::R_POWERPC_DTPREL); + } + else if (tls_type == tls::TLSOPT_TO_IE) + { + if (!gsym->has_got_offset(GOT_TYPE_TPREL)) + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + if (gsym->is_undefined() + || gsym->is_from_dynobj()) + { + got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn, + elfcpp::R_POWERPC_TPREL); + } + else + { + unsigned int off = got->add_constant(0); + gsym->set_got_offset(GOT_TYPE_TPREL, off); + unsigned int dynrel = elfcpp::R_POWERPC_TPREL; + rela_dyn->add_symbolless_global_addend(gsym, dynrel, + got, off, 0); + } + } + } + else if (tls_type == tls::TLSOPT_TO_LE) + { + // no GOT relocs needed for Local Exec. + } + else + gold_unreachable(); + } + break; + + case elfcpp::R_POWERPC_GOT_TLSLD16: + case elfcpp::R_POWERPC_GOT_TLSLD16_LO: + case elfcpp::R_POWERPC_GOT_TLSLD16_HI: + case elfcpp::R_POWERPC_GOT_TLSLD16_HA: + { + const tls::Tls_optimization tls_type = target->optimize_tls_ld(); + if (tls_type == tls::TLSOPT_NONE) + target->tlsld_got_offset(symtab, layout, object); + else if (tls_type == tls::TLSOPT_TO_LE) + { + // no GOT relocs needed for Local Exec. + if (parameters->options().emit_relocs()) + { + Output_section* os = layout->tls_segment()->first_section(); + gold_assert(os != NULL); + os->set_needs_symtab_index(); + } + } + else + gold_unreachable(); + } + break; + + case elfcpp::R_POWERPC_GOT_DTPREL16: + case elfcpp::R_POWERPC_GOT_DTPREL16_LO: + case elfcpp::R_POWERPC_GOT_DTPREL16_HI: + case elfcpp::R_POWERPC_GOT_DTPREL16_HA: + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + if (!gsym->final_value_is_known() + && (gsym->is_from_dynobj() + || gsym->is_undefined() + || gsym->is_preemptible())) + got->add_global_with_rel(gsym, GOT_TYPE_DTPREL, + target->rela_dyn_section(layout), + elfcpp::R_POWERPC_DTPREL); + else + got->add_global_tls(gsym, GOT_TYPE_DTPREL); + } + break; + + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_GOT_TPREL16_LO: + case elfcpp::R_POWERPC_GOT_TPREL16_HI: + case elfcpp::R_POWERPC_GOT_TPREL16_HA: + { + const bool final = gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); + if (tls_type == tls::TLSOPT_NONE) + { + if (!gsym->has_got_offset(GOT_TYPE_TPREL)) + { + Output_data_got_powerpc<size, big_endian>* got + = target->got_section(symtab, layout); + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + if (gsym->is_undefined() + || gsym->is_from_dynobj()) + { + got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn, + elfcpp::R_POWERPC_TPREL); + } + else + { + unsigned int off = got->add_constant(0); + gsym->set_got_offset(GOT_TYPE_TPREL, off); + unsigned int dynrel = elfcpp::R_POWERPC_TPREL; + rela_dyn->add_symbolless_global_addend(gsym, dynrel, + got, off, 0); + } + } + } + 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; + } + + switch (r_type) + { + case elfcpp::R_POWERPC_GOT_TLSLD16: + case elfcpp::R_POWERPC_GOT_TLSGD16: + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_GOT_DTPREL16: + case elfcpp::R_POWERPC_GOT16: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_TOC16: + case elfcpp::R_PPC64_TOC16_DS: + ppc_object->set_has_small_toc_reloc(); + default: + break; + } +} + +// Process relocations for gc. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::gc_process_relocs( + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + unsigned int, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols) +{ + typedef Target_powerpc<size, big_endian> Powerpc; + typedef typename Target_powerpc<size, big_endian>::Scan Scan; + Powerpc_relobj<size, big_endian>* ppc_object + = static_cast<Powerpc_relobj<size, big_endian>*>(object); + if (size == 64) + ppc_object->set_opd_valid(); + if (size == 64 && data_shndx == ppc_object->opd_shndx()) + { + typename Powerpc_relobj<size, big_endian>::Access_from::iterator p; + for (p = ppc_object->access_from_map()->begin(); + p != ppc_object->access_from_map()->end(); + ++p) + { + Address dst_off = p->first; + unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); + typename Powerpc_relobj<size, big_endian>::Section_refs::iterator s; + for (s = p->second.begin(); s != p->second.end(); ++s) + { + Object* src_obj = s->first; + unsigned int src_indx = s->second; + symtab->gc()->add_reference(src_obj, src_indx, + ppc_object, dst_indx); + } + p->second.clear(); + } + ppc_object->access_from_map()->clear(); + ppc_object->process_gc_mark(symtab); + // Don't look at .opd relocs as .opd will reference everything. + return; + } + + gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan, + typename Target_powerpc::Relocatable_size_for_reloc>( + symtab, + layout, + this, + object, + data_shndx, + prelocs, + reloc_count, + output_section, + needs_special_offset_handling, + local_symbol_count, + plocal_symbols); +} + +// Handle target specific gc actions when adding a gc reference from +// SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX +// and DST_OFF. For powerpc64, this adds a referenc to the code +// section of a function descriptor. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::do_gc_add_reference( + Symbol_table* symtab, + Object* src_obj, + unsigned int src_shndx, + Object* dst_obj, + unsigned int dst_shndx, + Address dst_off) const +{ + if (size != 64 || dst_obj->is_dynamic()) + return; + + Powerpc_relobj<size, big_endian>* ppc_object + = static_cast<Powerpc_relobj<size, big_endian>*>(dst_obj); + if (dst_shndx != 0 && dst_shndx == ppc_object->opd_shndx()) + { + if (ppc_object->opd_valid()) + { + dst_shndx = ppc_object->get_opd_ent(dst_off); + symtab->gc()->add_reference(src_obj, src_shndx, dst_obj, dst_shndx); + } + else + { + // If we haven't run scan_opd_relocs, we must delay + // processing this function descriptor reference. + ppc_object->add_reference(src_obj, src_shndx, dst_off); + } + } +} + +// Add any special sections for this symbol to the gc work list. +// For powerpc64, this adds the code section of a function +// descriptor. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::do_gc_mark_symbol( + Symbol_table* symtab, + Symbol* sym) const +{ + if (size == 64) + { + Powerpc_relobj<size, big_endian>* ppc_object + = static_cast<Powerpc_relobj<size, big_endian>*>(sym->object()); + bool is_ordinary; + unsigned int shndx = sym->shndx(&is_ordinary); + if (is_ordinary && shndx != 0 && shndx == ppc_object->opd_shndx()) + { + Sized_symbol<size>* gsym = symtab->get_sized_symbol<size>(sym); + Address dst_off = gsym->value(); + if (ppc_object->opd_valid()) + { + unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); + symtab->gc()->worklist().push(Section_id(ppc_object, dst_indx)); + } + else + ppc_object->add_gc_mark(dst_off); + } + } +} + +// For a symbol location in .opd, set LOC to the location of the +// function entry. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::do_function_location( + Symbol_location* loc) const +{ + if (size == 64 && loc->shndx != 0) + { + if (loc->object->is_dynamic()) + { + Powerpc_dynobj<size, big_endian>* ppc_object + = static_cast<Powerpc_dynobj<size, big_endian>*>(loc->object); + if (loc->shndx == ppc_object->opd_shndx()) + { + Address dest_off; + Address off = loc->offset - ppc_object->opd_address(); + loc->shndx = ppc_object->get_opd_ent(off, &dest_off); + loc->offset = dest_off; + } + } + else + { + const Powerpc_relobj<size, big_endian>* ppc_object + = static_cast<const Powerpc_relobj<size, big_endian>*>(loc->object); + if (loc->shndx == ppc_object->opd_shndx()) + { + Address dest_off; + loc->shndx = ppc_object->get_opd_ent(loc->offset, &dest_off); + loc->offset = dest_off; + } + } + } +} + +// Scan relocations for a section. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::scan_relocs( + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols) +{ + typedef Target_powerpc<size, big_endian> Powerpc; + typedef typename Target_powerpc<size, big_endian>::Scan Scan; + + if (sh_type == elfcpp::SHT_REL) + { + gold_error(_("%s: unsupported REL reloc section"), + object->name().c_str()); + return; + } + + gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>( + symtab, + layout, + this, + object, + data_shndx, + prelocs, + reloc_count, + output_section, + needs_special_offset_handling, + local_symbol_count, + plocal_symbols); +} + +// Functor class for processing the global symbol table. +// Removes symbols defined on discarded opd entries. + +template<bool big_endian> +class Global_symbol_visitor_opd +{ + public: + Global_symbol_visitor_opd() + { } + + void + operator()(Sized_symbol<64>* sym) + { + if (sym->has_symtab_index() + || sym->source() != Symbol::FROM_OBJECT + || !sym->in_real_elf()) + return; + + if (sym->object()->is_dynamic()) + return; + + Powerpc_relobj<64, big_endian>* symobj + = static_cast<Powerpc_relobj<64, big_endian>*>(sym->object()); + if (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_undefined(); + sym->set_is_defined_in_discarded_section(); + sym->set_symtab_index(-1U); + } + } +}; + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::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); + } +} + +// Sort linker created .got section first (for the header), then input +// sections belonging to files using small model code. + +template<bool big_endian> +class Sort_toc_sections +{ + public: + bool + operator()(const Output_section::Input_section& is1, + const Output_section::Input_section& is2) const + { + if (!is1.is_input_section() && is2.is_input_section()) + return true; + bool small1 + = (is1.is_input_section() + && (static_cast<const Powerpc_relobj<64, big_endian>*>(is1.relobj()) + ->has_small_toc_reloc())); + bool small2 + = (is2.is_input_section() + && (static_cast<const Powerpc_relobj<64, big_endian>*>(is2.relobj()) + ->has_small_toc_reloc())); + return small1 && !small2; + } +}; + +// Finalize the sections. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::do_finalize_sections( + Layout* layout, + const Input_objects*, + Symbol_table* symtab) +{ + if (parameters->doing_static_link()) + { + // At least some versions of glibc elf-init.o have a strong + // reference to __rela_iplt marker syms. A weak ref would be + // better.. + if (this->iplt_ != NULL) + { + Reloc_section* rel = this->iplt_->rel_plt(); + symtab->define_in_output_data("__rela_iplt_start", NULL, + Symbol_table::PREDEFINED, rel, 0, 0, + elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, + elfcpp::STV_HIDDEN, 0, false, true); + symtab->define_in_output_data("__rela_iplt_end", NULL, + Symbol_table::PREDEFINED, rel, 0, 0, + elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, + elfcpp::STV_HIDDEN, 0, true, true); + } + else + { + symtab->define_as_constant("__rela_iplt_start", NULL, + Symbol_table::PREDEFINED, 0, 0, + elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, + elfcpp::STV_HIDDEN, 0, true, false); + symtab->define_as_constant("__rela_iplt_end", NULL, + Symbol_table::PREDEFINED, 0, 0, + elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, + elfcpp::STV_HIDDEN, 0, true, false); + } + } + + if (size == 64) + { + typedef Global_symbol_visitor_opd<big_endian> Symbol_visitor; + symtab->for_all_symbols<64, Symbol_visitor>(Symbol_visitor()); + + if (!parameters->options().relocatable()) + { + this->define_save_restore_funcs(layout, symtab); + + // Annoyingly, we need to make these sections now whether or + // not we need them. If we delay until do_relax then we + // need to mess with the relaxation machinery checkpointing. + this->got_section(symtab, layout); + this->make_brlt_section(layout); + + if (parameters->options().toc_sort()) + { + Output_section* os = this->got_->output_section(); + if (os != NULL && os->input_sections().size() > 1) + std::stable_sort(os->input_sections().begin(), + os->input_sections().end(), + Sort_toc_sections<big_endian>()); + } + } + } + + // 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_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 TRUE iff INSN is one we expect on a _LO variety toc/got +// reloc. + +static bool +ok_lo_toc_insn(uint32_t insn) +{ + return ((insn & (0x3f << 26)) == 14u << 26 /* addi */ + || (insn & (0x3f << 26)) == 32u << 26 /* lwz */ + || (insn & (0x3f << 26)) == 34u << 26 /* lbz */ + || (insn & (0x3f << 26)) == 36u << 26 /* stw */ + || (insn & (0x3f << 26)) == 38u << 26 /* stb */ + || (insn & (0x3f << 26)) == 40u << 26 /* lhz */ + || (insn & (0x3f << 26)) == 42u << 26 /* lha */ + || (insn & (0x3f << 26)) == 44u << 26 /* sth */ + || (insn & (0x3f << 26)) == 46u << 26 /* lmw */ + || (insn & (0x3f << 26)) == 47u << 26 /* stmw */ + || (insn & (0x3f << 26)) == 48u << 26 /* lfs */ + || (insn & (0x3f << 26)) == 50u << 26 /* lfd */ + || (insn & (0x3f << 26)) == 52u << 26 /* stfs */ + || (insn & (0x3f << 26)) == 54u << 26 /* stfd */ + || ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */ + && (insn & 3) != 1) + || ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */ + && ((insn & 3) == 0 || (insn & 3) == 3)) + || (insn & (0x3f << 26)) == 12u << 26 /* addic */); +} + +// Return the value to use for a branch relocation. + +template<int size, bool big_endian> +bool +Target_powerpc<size, big_endian>::symval_for_branch( + const Symbol_table* symtab, + const Sized_symbol<size>* gsym, + Powerpc_relobj<size, big_endian>* object, + Address *value, + unsigned int *dest_shndx) +{ + if (size == 32 || this->abiversion() >= 2) + gold_unreachable(); + *dest_shndx = 0; + + // If the symbol is defined in an opd section, ie. is a function + // descriptor, use the function descriptor code entry address + Powerpc_relobj<size, big_endian>* symobj = object; + if (gsym != NULL + && gsym->source() != Symbol::FROM_OBJECT) + return true; + if (gsym != NULL) + symobj = static_cast<Powerpc_relobj<size, big_endian>*>(gsym->object()); + unsigned int shndx = symobj->opd_shndx(); + if (shndx == 0) + return true; + Address opd_addr = symobj->get_output_section_offset(shndx); + if (opd_addr == invalid_address) + return true; + opd_addr += symobj->output_section_address(shndx); + 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); + if (symtab->is_section_folded(symobj, *dest_shndx)) + { + Section_id folded + = symtab->icf()->get_folded_section(symobj, *dest_shndx); + symobj = static_cast<Powerpc_relobj<size, big_endian>*>(folded.first); + *dest_shndx = folded.second; + } + Address sec_addr = symobj->get_output_section_offset(*dest_shndx); + if (sec_addr == invalid_address) + return false; + + sec_addr += symobj->output_section(*dest_shndx)->address(); + *value = sec_addr + sec_off; + } + return true; +} + +// Perform a relocation. + +template<int size, bool big_endian> +inline bool +Target_powerpc<size, big_endian>::Relocate::relocate( + const Relocate_info<size, big_endian>* relinfo, + Target_powerpc* target, + Output_section* os, + size_t relnum, + const elfcpp::Rela<size, big_endian>& rela, + unsigned int r_type, + const Sized_symbol<size>* gsym, + const Symbol_value<size>* psymval, + unsigned char* view, + Address address, + section_size_type view_size) +{ + if (view == NULL) + return true; + + switch (this->maybe_skip_tls_get_addr_call(r_type, gsym)) + { + case Track_tls::NOT_EXPECTED: + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("__tls_get_addr call lacks marker reloc")); + break; + case Track_tls::EXPECTED: + // We have already complained. + break; + case Track_tls::SKIP: + return true; + case Track_tls::NORMAL: + break; + } + + typedef Powerpc_relocate_functions<size, big_endian> Reloc; + typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn; + Powerpc_relobj<size, big_endian>* const object + = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); + Address value = 0; + bool has_stub_value = false; + unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); + if ((gsym != NULL + ? gsym->use_plt_offset(Scan::get_reference_flags(r_type, target)) + : object->local_has_plt_offset(r_sym)) + && (!psymval->is_ifunc_symbol() + || Scan::reloc_needs_plt_for_ifunc(target, object, r_type, false))) + { + if (size == 64 + && gsym != NULL + && target->abiversion() >= 2 + && !parameters->options().output_is_position_independent() + && !is_branch_reloc(r_type)) + { + unsigned int off = target->glink_section()->find_global_entry(gsym); + gold_assert(off != (unsigned int)-1); + value = target->glink_section()->global_entry_address() + off; + } + else + { + Stub_table<size, big_endian>* stub_table + = object->stub_table(relinfo->data_shndx); + if (stub_table == NULL) + { + // This is a ref from a data section to an ifunc symbol. + if (target->stub_tables().size() != 0) + stub_table = target->stub_tables()[0]; + } + gold_assert(stub_table != NULL); + Address off; + if (gsym != NULL) + off = stub_table->find_plt_call_entry(object, gsym, r_type, + rela.get_r_addend()); + else + off = stub_table->find_plt_call_entry(object, r_sym, r_type, + rela.get_r_addend()); + gold_assert(off != invalid_address); + value = stub_table->stub_address() + off; + } + has_stub_value = true; + } + + if (r_type == elfcpp::R_POWERPC_GOT16 + || r_type == elfcpp::R_POWERPC_GOT16_LO + || r_type == elfcpp::R_POWERPC_GOT16_HI + || r_type == elfcpp::R_POWERPC_GOT16_HA + || r_type == elfcpp::R_PPC64_GOT16_DS + || r_type == elfcpp::R_PPC64_GOT16_LO_DS) + { + if (gsym != NULL) + { + gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); + value = gsym->got_offset(GOT_TYPE_STANDARD); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); + value = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); + } + value -= target->got_section()->got_base_offset(object); + } + else if (r_type == elfcpp::R_PPC64_TOC) + { + value = (target->got_section()->output_section()->address() + + object->toc_base_offset()); + } + else if (gsym != NULL + && (r_type == elfcpp::R_POWERPC_REL24 + || r_type == elfcpp::R_PPC_PLTREL24) + && has_stub_value) + { + if (size == 64) + { + typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + bool can_plt_call = false; + if (rela.get_r_offset() + 8 <= view_size) + { + Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv); + Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1); + if ((insn & 1) != 0 + && (insn2 == nop + || insn2 == cror_15_15_15 || insn2 == cror_31_31_31)) + { + elfcpp::Swap<32, big_endian>:: + writeval(wv + 1, ld_2_1 + target->stk_toc()); + 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) + { + // g++ as of 20130507 emits self-calls without a + // following nop. This is arguably wrong since we have + // conflicting information. On the one hand a global + // symbol and on the other a local call sequence, but + // don't error for this special case. + // It isn't possible to cheaply verify we have exactly + // such a call. Allow all calls to the same section. + bool ok = false; + Address code = value; + if (gsym->source() == Symbol::FROM_OBJECT + && gsym->object() == object) + { + unsigned int dest_shndx = 0; + if (target->abiversion() < 2) + { + Address addend = rela.get_r_addend(); + code = psymval->value(object, addend); + target->symval_for_branch(relinfo->symtab, gsym, object, + &code, &dest_shndx); + } + bool is_ordinary; + if (dest_shndx == 0) + dest_shndx = gsym->shndx(&is_ordinary); + ok = dest_shndx == relinfo->data_shndx; + } + if (!ok) + { + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("call lacks nop, can't restore toc; " + "recompile with -fPIC")); + value = code; + } + } + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) + { + // First instruction of a global dynamic sequence, arg setup insn. + const bool final = gsym == NULL || gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); + enum Got_type got_type = GOT_TYPE_STANDARD; + if (tls_type == tls::TLSOPT_NONE) + got_type = GOT_TYPE_TLSGD; + else if (tls_type == tls::TLSOPT_TO_IE) + got_type = GOT_TYPE_TPREL; + if (got_type != GOT_TYPE_STANDARD) + { + if (gsym != NULL) + { + gold_assert(gsym->has_got_offset(got_type)); + value = gsym->got_offset(got_type); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, got_type)); + value = object->local_got_offset(r_sym, got_type); + } + value -= target->got_section()->got_base_offset(object); + } + if (tls_type == tls::TLSOPT_TO_IE) + { + if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + insn &= (1 << 26) - (1 << 16); // extract rt,ra from addi + if (size == 32) + insn |= 32 << 26; // lwz + else + insn |= 58 << 26; // ld + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + } + r_type += (elfcpp::R_POWERPC_GOT_TPREL16 + - elfcpp::R_POWERPC_GOT_TLSGD16); + } + else if (tls_type == tls::TLSOPT_TO_LE) + { + if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = addis_3_13; + if (size == 32) + insn = addis_3_2; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_HA; + value = psymval->value(object, rela.get_r_addend()); + } + else + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = nop; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_NONE; + } + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) + { + // First instruction of a local dynamic sequence, arg setup insn. + const tls::Tls_optimization tls_type = target->optimize_tls_ld(); + if (tls_type == tls::TLSOPT_NONE) + { + value = target->tlsld_got_offset(); + value -= target->got_section()->got_base_offset(object); + } + else + { + gold_assert(tls_type == tls::TLSOPT_TO_LE); + if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = addis_3_13; + if (size == 32) + insn = addis_3_2; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_HA; + value = dtp_offset; + } + else + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = nop; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_NONE; + } + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_DTPREL16 + || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_LO + || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HI + || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HA) + { + // Accesses relative to a local dynamic sequence address, + // no optimisation here. + if (gsym != NULL) + { + gold_assert(gsym->has_got_offset(GOT_TYPE_DTPREL)); + value = gsym->got_offset(GOT_TYPE_DTPREL); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_DTPREL)); + value = object->local_got_offset(r_sym, GOT_TYPE_DTPREL); + } + value -= target->got_section()->got_base_offset(object); + } + else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) + { + // First instruction of initial exec sequence. + const bool final = gsym == NULL || gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); + if (tls_type == tls::TLSOPT_NONE) + { + if (gsym != NULL) + { + gold_assert(gsym->has_got_offset(GOT_TYPE_TPREL)); + value = gsym->got_offset(GOT_TYPE_TPREL); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_TPREL)); + value = object->local_got_offset(r_sym, GOT_TYPE_TPREL); + } + value -= target->got_section()->got_base_offset(object); + } + else + { + gold_assert(tls_type == tls::TLSOPT_TO_LE); + if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + insn &= (1 << 26) - (1 << 21); // extract rt from ld + if (size == 32) + insn |= addis_0_2; + else + insn |= addis_0_13; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_HA; + value = psymval->value(object, rela.get_r_addend()); + } + else + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = nop; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_NONE; + } + } + } + else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) + { + // Second instruction of a global dynamic sequence, + // the __tls_get_addr call + this->expect_tls_get_addr_call(relinfo, relnum, rela.get_r_offset()); + const bool final = gsym == NULL || gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); + if (tls_type != tls::TLSOPT_NONE) + { + if (tls_type == tls::TLSOPT_TO_IE) + { + Insn* iview = reinterpret_cast<Insn*>(view); + Insn insn = add_3_3_13; + if (size == 32) + insn = add_3_3_2; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_NONE; + } + else + { + Insn* iview = reinterpret_cast<Insn*>(view); + Insn insn = addi_3_3; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_LO; + view += 2 * big_endian; + value = psymval->value(object, rela.get_r_addend()); + } + this->skip_next_tls_get_addr_call(); + } + } + 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->expect_tls_get_addr_call(relinfo, relnum, rela.get_r_offset()); + const tls::Tls_optimization tls_type = target->optimize_tls_ld(); + if (tls_type == tls::TLSOPT_TO_LE) + { + Insn* iview = reinterpret_cast<Insn*>(view); + Insn insn = addi_3_3; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + this->skip_next_tls_get_addr_call(); + r_type = elfcpp::R_POWERPC_TPREL16_LO; + view += 2 * big_endian; + value = dtp_offset; + } + } + else if (r_type == elfcpp::R_POWERPC_TLS) + { + // Second instruction of an initial exec sequence + const bool final = gsym == NULL || gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); + if (tls_type == tls::TLSOPT_TO_LE) + { + Insn* iview = reinterpret_cast<Insn*>(view); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + unsigned int reg = size == 32 ? 2 : 13; + insn = at_tls_transform(insn, reg); + gold_assert(insn != 0); + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_LO; + view += 2 * big_endian; + value = psymval->value(object, rela.get_r_addend()); + } + } + else if (!has_stub_value) + { + Address addend = 0; + if (!(size == 32 && r_type == elfcpp::R_PPC_PLTREL24)) + addend = rela.get_r_addend(); + value = psymval->value(object, addend); + if (size == 64 && is_branch_reloc(r_type)) + { + if (target->abiversion() >= 2) + { + if (gsym != NULL) + value += object->ppc64_local_entry_offset(gsym); + else + value += object->ppc64_local_entry_offset(r_sym); + } + else + { + unsigned int dest_shndx; + target->symval_for_branch(relinfo->symtab, gsym, object, + &value, &dest_shndx); + } + } + Address max_branch_offset = 0; + if (r_type == elfcpp::R_POWERPC_REL24 + || r_type == elfcpp::R_PPC_PLTREL24 + || r_type == elfcpp::R_PPC_LOCAL24PC) + max_branch_offset = 1 << 25; + else if (r_type == elfcpp::R_POWERPC_REL14 + || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN + || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN) + max_branch_offset = 1 << 15; + if (max_branch_offset != 0 + && value - address + max_branch_offset >= 2 * max_branch_offset) + { + Stub_table<size, big_endian>* stub_table + = object->stub_table(relinfo->data_shndx); + if (stub_table != NULL) + { + Address off = stub_table->find_long_branch_entry(object, value); + if (off != invalid_address) + { + value = (stub_table->stub_address() + stub_table->plt_size() + + off); + has_stub_value = true; + } + } + } + } + + 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: + case elfcpp::R_PPC64_TPREL16_HIGH: + case elfcpp::R_PPC64_TPREL16_HIGHA: + if (size != 64) + // R_PPC_TLSGD, R_PPC_TLSLD, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HI + 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: + case elfcpp::R_PPC64_DTPREL16_HIGH: + case elfcpp::R_PPC64_DTPREL16_HIGHA: + // tls symbol values are relative to tls_segment()->vaddr() + value -= dtp_offset; + break; + + case elfcpp::R_PPC64_ADDR64_LOCAL: + if (gsym != NULL) + value += object->ppc64_local_entry_offset(gsym); + else + value += object->ppc64_local_entry_offset(r_sym); + break; + + default: + break; + } + + Insn branch_bit = 0; + switch (r_type) + { + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + branch_bit = 1 << 21; + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + { + Insn* iview = reinterpret_cast<Insn*>(view); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + insn &= ~(1 << 21); + insn |= branch_bit; + if (this->is_isa_v2) + { + // Set 'a' bit. This is 0b00010 in BO field for branch + // on CR(BI) insns (BO == 001at or 011at), and 0b01000 + // for branch on CTR insns (BO == 1a00t or 1a01t). + if ((insn & (0x14 << 21)) == (0x04 << 21)) + insn |= 0x02 << 21; + else if ((insn & (0x14 << 21)) == (0x10 << 21)) + insn |= 0x08 << 21; + else + break; + } + else + { + // Invert 'y' bit if not the default. + if (static_cast<Signed_address>(value) < 0) + insn ^= 1 << 21; + } + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + } + break; + + default: + break; + } + + if (size == 64) + { + // Multi-instruction sequences that access the TOC can be + // optimized, eg. addis ra,r2,0; addi rb,ra,x; + // to nop; addi rb,r2,x; + switch (r_type) + { + default: + break; + + case elfcpp::R_POWERPC_GOT_TLSLD16_HA: + case elfcpp::R_POWERPC_GOT_TLSGD16_HA: + case elfcpp::R_POWERPC_GOT_TPREL16_HA: + case elfcpp::R_POWERPC_GOT_DTPREL16_HA: + case elfcpp::R_POWERPC_GOT16_HA: + case elfcpp::R_PPC64_TOC16_HA: + if (parameters->options().toc_optimize()) + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + if ((insn & ((0x3f << 26) | 0x1f << 16)) + != ((15u << 26) | (2 << 16)) /* addis rt,2,imm */) + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("toc optimization is not supported " + "for %#08x instruction"), insn); + else if (value + 0x8000 < 0x10000) + { + elfcpp::Swap<32, big_endian>::writeval(iview, nop); + return true; + } + } + break; + + case elfcpp::R_POWERPC_GOT_TLSLD16_LO: + case elfcpp::R_POWERPC_GOT_TLSGD16_LO: + case elfcpp::R_POWERPC_GOT_TPREL16_LO: + case elfcpp::R_POWERPC_GOT_DTPREL16_LO: + case elfcpp::R_POWERPC_GOT16_LO: + case elfcpp::R_PPC64_GOT16_LO_DS: + case elfcpp::R_PPC64_TOC16_LO: + case elfcpp::R_PPC64_TOC16_LO_DS: + if (parameters->options().toc_optimize()) + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + if (!ok_lo_toc_insn(insn)) + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("toc optimization is not supported " + "for %#08x instruction"), insn); + else if (value + 0x8000 < 0x10000) + { + if ((insn & (0x3f << 26)) == 12u << 26 /* addic */) + { + // Transform addic to addi when we change reg. + insn &= ~((0x3f << 26) | (0x1f << 16)); + insn |= (14u << 26) | (2 << 16); + } + else + { + insn &= ~(0x1f << 16); + insn |= 2 << 16; + } + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + } + } + break; + } + } + + typename Reloc::Overflow_check overflow = Reloc::CHECK_NONE; + elfcpp::Shdr<size, big_endian> shdr(relinfo->data_shdr); + 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_UADDR16: + overflow = Reloc::CHECK_BITFIELD; + break; + + case elfcpp::R_POWERPC_ADDR16: + // We really should have three separate relocations, + // one for 16-bit data, one for insns with 16-bit signed fields, + // and one for insns with 16-bit unsigned fields. + overflow = Reloc::CHECK_BITFIELD; + if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) + overflow = Reloc::CHECK_LOW_INSN; + break; + + case elfcpp::R_POWERPC_ADDR16_HI: + case elfcpp::R_POWERPC_ADDR16_HA: + case elfcpp::R_POWERPC_GOT16_HI: + case elfcpp::R_POWERPC_GOT16_HA: + case elfcpp::R_POWERPC_PLT16_HI: + case elfcpp::R_POWERPC_PLT16_HA: + case elfcpp::R_POWERPC_SECTOFF_HI: + case elfcpp::R_POWERPC_SECTOFF_HA: + case elfcpp::R_PPC64_TOC16_HI: + case elfcpp::R_PPC64_TOC16_HA: + case elfcpp::R_PPC64_PLTGOT16_HI: + case elfcpp::R_PPC64_PLTGOT16_HA: + case elfcpp::R_POWERPC_TPREL16_HI: + case elfcpp::R_POWERPC_TPREL16_HA: + case elfcpp::R_POWERPC_DTPREL16_HI: + case elfcpp::R_POWERPC_DTPREL16_HA: + case elfcpp::R_POWERPC_GOT_TLSGD16_HI: + case elfcpp::R_POWERPC_GOT_TLSGD16_HA: + case elfcpp::R_POWERPC_GOT_TLSLD16_HI: + case elfcpp::R_POWERPC_GOT_TLSLD16_HA: + case elfcpp::R_POWERPC_GOT_TPREL16_HI: + case elfcpp::R_POWERPC_GOT_TPREL16_HA: + case elfcpp::R_POWERPC_GOT_DTPREL16_HI: + case elfcpp::R_POWERPC_GOT_DTPREL16_HA: + case elfcpp::R_POWERPC_REL16_HI: + case elfcpp::R_POWERPC_REL16_HA: + if (size != 32) + overflow = Reloc::CHECK_HIGH_INSN; + break; + + 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_GOT_DTPREL16: + overflow = Reloc::CHECK_LOW_INSN; + break; + + 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_PPC64_ADDR16_DS: + case elfcpp::R_POWERPC_REL24: + case elfcpp::R_PPC_PLTREL24: + case elfcpp::R_PPC_LOCAL24PC: + 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: + overflow = Reloc::CHECK_SIGNED; + break; + } + + if (overflow == Reloc::CHECK_LOW_INSN + || overflow == Reloc::CHECK_HIGH_INSN) + { + Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + + overflow = Reloc::CHECK_SIGNED; + if ((insn & (0x3f << 26)) == 10u << 26 /* cmpli */) + overflow = Reloc::CHECK_BITFIELD; + else if (overflow == Reloc::CHECK_LOW_INSN + ? ((insn & (0x3f << 26)) == 28u << 26 /* andi */ + || (insn & (0x3f << 26)) == 24u << 26 /* ori */ + || (insn & (0x3f << 26)) == 26u << 26 /* xori */) + : ((insn & (0x3f << 26)) == 29u << 26 /* andis */ + || (insn & (0x3f << 26)) == 25u << 26 /* oris */ + || (insn & (0x3f << 26)) == 27u << 26 /* xoris */)) + overflow = Reloc::CHECK_UNSIGNED; + } + + typename Powerpc_relocate_functions<size, big_endian>::Status status + = Powerpc_relocate_functions<size, big_endian>::STATUS_OK; + switch (r_type) + { + case elfcpp::R_POWERPC_NONE: + case elfcpp::R_POWERPC_TLS: + case elfcpp::R_POWERPC_GNU_VTINHERIT: + case elfcpp::R_POWERPC_GNU_VTENTRY: + break; + + case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_PPC64_REL64: + case elfcpp::R_PPC64_TOC: + case elfcpp::R_PPC64_ADDR64_LOCAL: + 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: + status = Reloc::addr32(view, value, overflow); + break; + + case elfcpp::R_POWERPC_REL32: + 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_PPC64_ADDR16_HIGH: + case elfcpp::R_PPC64_TPREL16_HIGH: + case elfcpp::R_PPC64_DTPREL16_HIGH: + if (size == 32) + // R_PPC_EMB_MRKREF, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HA + goto unsupp; + 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_PPC64_ADDR16_HIGHA: + case elfcpp::R_PPC64_TPREL16_HIGHA: + case elfcpp::R_PPC64_DTPREL16_HIGHA: + if (size == 32) + // R_PPC_EMB_RELSEC16, R_PPC_EMB_RELST_HI, R_PPC_EMB_BIT_FLD + goto unsupp; + 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_RELSDA: + case elfcpp::R_PPC_TOC16: + default: + unsupp: + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("unsupported reloc %u"), + r_type); + break; + } + if (status != Powerpc_relocate_functions<size, big_endian>::STATUS_OK + && (has_stub_value + || !(gsym != NULL + && gsym->is_weak_undefined() + && is_branch_reloc(r_type)))) + { + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("relocation overflow")); + if (has_stub_value) + gold_info(_("try relinking with a smaller --stub-group-size")); + } + + return true; +} + +// Relocate section data. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::relocate_section( + const Relocate_info<size, big_endian>* relinfo, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + unsigned char* view, + Address address, + section_size_type view_size, + const Reloc_symbol_changes* reloc_symbol_changes) +{ + typedef Target_powerpc<size, big_endian> Powerpc; + typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate; + typedef typename Target_powerpc<size, big_endian>::Relocate_comdat_behavior + Powerpc_comdat_behavior; + + gold_assert(sh_type == elfcpp::SHT_RELA); + + gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA, + Powerpc_relocate, Powerpc_comdat_behavior>( + relinfo, + this, + prelocs, + reloc_count, + output_section, + needs_special_offset_handling, + view, + address, + view_size, + reloc_symbol_changes); +} + +class Powerpc_scan_relocatable_reloc +{ +public: + // Return the strategy to use for a local symbol which is not a + // section symbol, given the relocation type. + inline Relocatable_relocs::Reloc_strategy + local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym) + { + if (r_type == 0 && r_sym == 0) + return Relocatable_relocs::RELOC_DISCARD; + return Relocatable_relocs::RELOC_COPY; + } + + // Return the strategy to use for a local symbol which is a section + // symbol, given the relocation type. + inline Relocatable_relocs::Reloc_strategy + local_section_strategy(unsigned int, Relobj*) + { + return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; + } + + // Return the strategy to use for a global symbol, given the + // relocation type, the object, and the symbol index. + inline Relocatable_relocs::Reloc_strategy + global_strategy(unsigned int r_type, Relobj*, unsigned int) + { + if (r_type == elfcpp::R_PPC_PLTREL24) + return Relocatable_relocs::RELOC_SPECIAL; + return Relocatable_relocs::RELOC_COPY; + } +}; + +// Scan the relocs during a relocatable link. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::scan_relocatable_relocs( + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols, + Relocatable_relocs* rr) +{ + gold_assert(sh_type == elfcpp::SHT_RELA); + + gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, + Powerpc_scan_relocatable_reloc>( + symtab, + layout, + object, + data_shndx, + prelocs, + reloc_count, + output_section, + needs_special_offset_handling, + local_symbol_count, + plocal_symbols, + rr); +} + +// Emit relocations for a section. +// This is a modified version of the function by the same name in +// target-reloc.h. Using relocate_special_relocatable for +// R_PPC_PLTREL24 would require duplication of the entire body of the +// loop, so we may as well duplicate the whole thing. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::relocate_relocs( + const Relocate_info<size, big_endian>* relinfo, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, + const Relocatable_relocs* rr, + unsigned char*, + Address view_address, + section_size_type, + unsigned char* reloc_view, + section_size_type reloc_view_size) +{ + gold_assert(sh_type == elfcpp::SHT_RELA); + + typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc + Reltype; + typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc_write + Reltype_write; + const int reloc_size + = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; + + Powerpc_relobj<size, big_endian>* const object + = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); + const unsigned int local_count = object->local_symbol_count(); + unsigned int got2_shndx = object->got2_shndx(); + Address got2_addend = 0; + if (got2_shndx != 0) + { + got2_addend = object->get_output_section_offset(got2_shndx); + gold_assert(got2_addend != invalid_address); + } + + unsigned char* pwrite = reloc_view; + bool zap_next = false; + for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) + { + Relocatable_relocs::Reloc_strategy strategy = rr->strategy(i); + if (strategy == Relocatable_relocs::RELOC_DISCARD) + continue; + + Reltype reloc(prelocs); + Reltype_write reloc_write(pwrite); + + Address offset = reloc.get_r_offset(); + typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); + unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); + unsigned int r_type = elfcpp::elf_r_type<size>(r_info); + const unsigned int orig_r_sym = r_sym; + typename elfcpp::Elf_types<size>::Elf_Swxword addend + = reloc.get_r_addend(); + const Symbol* gsym = NULL; + + if (zap_next) + { + // We could arrange to discard these and other relocs for + // tls optimised sequences in the strategy methods, but for + // now do as BFD ld does. + r_type = elfcpp::R_POWERPC_NONE; + zap_next = false; + } + + // Get the new symbol index. + if (r_sym < local_count) + { + switch (strategy) + { + case Relocatable_relocs::RELOC_COPY: + case Relocatable_relocs::RELOC_SPECIAL: + if (r_sym != 0) + { + r_sym = object->symtab_index(r_sym); + gold_assert(r_sym != -1U); + } + break; + + case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA: + { + // We are adjusting a section symbol. We need to find + // the symbol table index of the section symbol for + // the output section corresponding to input section + // in which this symbol is defined. + gold_assert(r_sym < local_count); + bool is_ordinary; + unsigned int shndx = + object->local_symbol_input_shndx(r_sym, &is_ordinary); + gold_assert(is_ordinary); + Output_section* os = object->output_section(shndx); + gold_assert(os != NULL); + gold_assert(os->needs_symtab_index()); + r_sym = os->symtab_index(); + } + break; + + default: + gold_unreachable(); + } + } + else + { + gsym = object->global_symbol(r_sym); + gold_assert(gsym != NULL); + if (gsym->is_forwarder()) + gsym = relinfo->symtab->resolve_forwards(gsym); + + gold_assert(gsym->has_symtab_index()); + r_sym = gsym->symtab_index(); + } + + // Get the new offset--the location in the output section where + // this relocation should be applied. + if (static_cast<Address>(offset_in_output_section) != invalid_address) + offset += offset_in_output_section; + else + { + section_offset_type sot_offset = + convert_types<section_offset_type, Address>(offset); + section_offset_type new_sot_offset = + output_section->output_offset(object, relinfo->data_shndx, + sot_offset); + gold_assert(new_sot_offset != -1); + offset = new_sot_offset; + } + + // In an object file, r_offset is an offset within the section. + // In an executable or dynamic object, generated by + // --emit-relocs, r_offset is an absolute address. + if (!parameters->options().relocatable()) + { + offset += view_address; + if (static_cast<Address>(offset_in_output_section) != invalid_address) + offset -= offset_in_output_section; + } + + // Handle the reloc addend based on the strategy. + if (strategy == Relocatable_relocs::RELOC_COPY) + ; + else if (strategy == Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA) + { + const Symbol_value<size>* psymval = object->local_symbol(orig_r_sym); + addend = psymval->value(object, addend); + } + else if (strategy == Relocatable_relocs::RELOC_SPECIAL) + { + if (addend >= 32768) + addend += got2_addend; + } + else + gold_unreachable(); + + if (!parameters->options().relocatable()) + { + if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) + { + // First instruction of a global dynamic sequence, + // arg setup insn. + const bool final = gsym == NULL || gsym->final_value_is_known(); + switch (this->optimize_tls_gd(final)) + { + case tls::TLSOPT_TO_IE: + r_type += (elfcpp::R_POWERPC_GOT_TPREL16 + - elfcpp::R_POWERPC_GOT_TLSGD16); + break; + case tls::TLSOPT_TO_LE: + if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) + r_type = elfcpp::R_POWERPC_TPREL16_HA; + else + { + r_type = elfcpp::R_POWERPC_NONE; + offset -= 2 * big_endian; + } + break; + default: + break; + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) + { + // First instruction of a local dynamic sequence, + // arg setup insn. + if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) + { + if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) + { + r_type = elfcpp::R_POWERPC_TPREL16_HA; + const Output_section* os = relinfo->layout->tls_segment() + ->first_section(); + gold_assert(os != NULL); + gold_assert(os->needs_symtab_index()); + r_sym = os->symtab_index(); + addend = dtp_offset; + } + else + { + r_type = elfcpp::R_POWERPC_NONE; + offset -= 2 * big_endian; + } + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) + { + // First instruction of initial exec sequence. + const bool final = gsym == NULL || gsym->final_value_is_known(); + if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) + { + if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) + r_type = elfcpp::R_POWERPC_TPREL16_HA; + else + { + r_type = elfcpp::R_POWERPC_NONE; + offset -= 2 * big_endian; + } + } + } + else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) + { + // Second instruction of a global dynamic sequence, + // the __tls_get_addr call + const bool final = gsym == NULL || gsym->final_value_is_known(); + switch (this->optimize_tls_gd(final)) + { + case tls::TLSOPT_TO_IE: + r_type = elfcpp::R_POWERPC_NONE; + zap_next = true; + break; + case tls::TLSOPT_TO_LE: + r_type = elfcpp::R_POWERPC_TPREL16_LO; + offset += 2 * big_endian; + zap_next = true; + break; + default: + break; + } + } + else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) + { + // Second instruction of a local dynamic sequence, + // the __tls_get_addr call + if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) + { + const Output_section* os = relinfo->layout->tls_segment() + ->first_section(); + gold_assert(os != NULL); + gold_assert(os->needs_symtab_index()); + r_sym = os->symtab_index(); + addend = dtp_offset; + r_type = elfcpp::R_POWERPC_TPREL16_LO; + offset += 2 * big_endian; + zap_next = true; + } + } + else if (r_type == elfcpp::R_POWERPC_TLS) + { + // Second instruction of an initial exec sequence + const bool final = gsym == NULL || gsym->final_value_is_known(); + if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) + { + r_type = elfcpp::R_POWERPC_TPREL16_LO; + offset += 2 * big_endian; + } + } + } + + reloc_write.put_r_offset(offset); + reloc_write.put_r_info(elfcpp::elf_r_info<size>(r_sym, r_type)); + reloc_write.put_r_addend(addend); + + pwrite += reloc_size; + } + + gold_assert(static_cast<section_size_type>(pwrite - reloc_view) + == reloc_view_size); +} + +// Return the value to use for a dynamic symbol which requires special +// treatment. This is how we support equality comparisons of function +// pointers across shared library boundaries, as described in the +// processor specific ABI supplement. + +template<int size, bool big_endian> +uint64_t +Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const +{ + if (size == 32) + { + gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); + for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); + p != this->stub_tables_.end(); + ++p) + { + Address off = (*p)->find_plt_call_entry(gsym); + if (off != invalid_address) + return (*p)->stub_address() + off; + } + } + else if (this->abiversion() >= 2) + { + unsigned int off = this->glink_section()->find_global_entry(gsym); + if (off != (unsigned int)-1) + return this->glink_section()->global_entry_address() + off; + } + gold_unreachable(); +} + +// Return the PLT address to use for a local symbol. +template<int size, bool big_endian> +uint64_t +Target_powerpc<size, big_endian>::do_plt_address_for_local( + const Relobj* object, + unsigned int symndx) const +{ + if (size == 32) + { + const Sized_relobj<size, big_endian>* relobj + = static_cast<const Sized_relobj<size, big_endian>*>(object); + for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); + p != this->stub_tables_.end(); + ++p) + { + Address off = (*p)->find_plt_call_entry(relobj->sized_relobj(), + symndx); + if (off != invalid_address) + return (*p)->stub_address() + off; + } + } + gold_unreachable(); +} + +// Return the PLT address to use for a global symbol. +template<int size, bool big_endian> +uint64_t +Target_powerpc<size, big_endian>::do_plt_address_for_global( + const Symbol* gsym) const +{ + if (size == 32) + { + for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); + p != this->stub_tables_.end(); + ++p) + { + Address off = (*p)->find_plt_call_entry(gsym); + if (off != invalid_address) + return (*p)->stub_address() + off; + } + } + else if (this->abiversion() >= 2) + { + unsigned int off = this->glink_section()->find_global_entry(gsym); + if (off != (unsigned int)-1) + return this->glink_section()->global_entry_address() + off; + } + gold_unreachable(); +} + +// Return the offset to use for the GOT_INDX'th got entry which is +// for a local tls symbol specified by OBJECT, SYMNDX. +template<int size, bool big_endian> +int64_t +Target_powerpc<size, big_endian>::do_tls_offset_for_local( + const Relobj* object, + unsigned int symndx, + unsigned int got_indx) const +{ + const Powerpc_relobj<size, big_endian>* ppc_object + = static_cast<const Powerpc_relobj<size, big_endian>*>(object); + if (ppc_object->local_symbol(symndx)->is_tls_symbol()) + { + for (Got_type got_type = GOT_TYPE_TLSGD; + got_type <= GOT_TYPE_TPREL; + got_type = Got_type(got_type + 1)) + if (ppc_object->local_has_got_offset(symndx, got_type)) + { + unsigned int off = ppc_object->local_got_offset(symndx, got_type); + if (got_type == GOT_TYPE_TLSGD) + off += size / 8; + if (off == got_indx * (size / 8)) + { + if (got_type == GOT_TYPE_TPREL) + return -tp_offset; + else + return -dtp_offset; + } + } + } + gold_unreachable(); +} + +// Return the offset to use for the GOT_INDX'th got entry which is +// for global tls symbol GSYM. +template<int size, bool big_endian> +int64_t +Target_powerpc<size, big_endian>::do_tls_offset_for_global( + Symbol* gsym, + unsigned int got_indx) const +{ + if (gsym->type() == elfcpp::STT_TLS) + { + for (Got_type got_type = GOT_TYPE_TLSGD; + got_type <= GOT_TYPE_TPREL; + got_type = Got_type(got_type + 1)) + if (gsym->has_got_offset(got_type)) + { + unsigned int off = gsym->got_offset(got_type); + if (got_type == GOT_TYPE_TLSGD) + off += size / 8; + if (off == got_indx * (size / 8)) + { + if (got_type == GOT_TYPE_TPREL) + return -tp_offset; + else + return -dtp_offset; + } + } + } + gold_unreachable(); +} + +// The selector for powerpc object files. + +template<int size, bool big_endian> +class Target_selector_powerpc : public Target_selector +{ +public: + Target_selector_powerpc() + : Target_selector(size == 64 ? elfcpp::EM_PPC64 : elfcpp::EM_PPC, + 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_instantiate_target() + { return new Target_powerpc<size, big_endian>(); } +}; + +Target_selector_powerpc<32, true> target_selector_ppc32; +Target_selector_powerpc<32, false> target_selector_ppc32le; +Target_selector_powerpc<64, true> target_selector_ppc64; +Target_selector_powerpc<64, false> target_selector_ppc64le; + +// Instantiate these constants for -O0 +template<int size, bool big_endian> +const int Output_data_glink<size, big_endian>::pltresolve_size; +template<int size, bool big_endian> +const typename Output_data_glink<size, big_endian>::Address + Output_data_glink<size, big_endian>::invalid_address; +template<int size, bool big_endian> +const typename Stub_table<size, big_endian>::Address + Stub_table<size, big_endian>::invalid_address; +template<int size, bool big_endian> +const typename Target_powerpc<size, big_endian>::Address + Target_powerpc<size, big_endian>::invalid_address; + +} // End anonymous namespace. |