X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gold%2Fpowerpc.cc;h=4521fc7e1736918f5aad11e6f7ac3f554b86376b;hb=9d5781f8a245086dcdd3cd8fcddcd5b19c3a1e49;hp=8bb633ffb0d7f9dd2e44a58343cf1881e421ad44;hpb=91d6fa6a035cc7d0b7be5c99c194a64cb80924b0;p=deliverable%2Fbinutils-gdb.git diff --git a/gold/powerpc.cc b/gold/powerpc.cc index 8bb633ffb0..4521fc7e17 100644 --- a/gold/powerpc.cc +++ b/gold/powerpc.cc @@ -1,6 +1,6 @@ // powerpc.cc -- powerpc target support for gold. -// Copyright 2008, 2009 Free Software Foundation, Inc. +// Copyright 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. // Written by David S. Miller // and David Edelsohn @@ -23,7 +23,9 @@ #include "gold.h" +#include #include "elfcpp.h" +#include "dwarf.h" #include "parameters.h" #include "reloc.h" #include "powerpc.h" @@ -47,41 +49,319 @@ using namespace gold; template class Output_data_plt_powerpc; +template +class Output_data_brlt_powerpc; + +template +class Output_data_got_powerpc; + +template +class Output_data_glink; + +template +class Stub_table; + +template +class Powerpc_relobj : public Sized_relobj_file +{ +public: + typedef typename elfcpp::Elf_types::Elf_Addr Address; + typedef Unordered_set Section_refs; + typedef Unordered_map Access_from; + + Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset, + const typename elfcpp::Ehdr& ehdr) + : Sized_relobj_file(name, input_file, offset, ehdr), + special_(0), has_small_toc_reloc_(false), opd_valid_(false), + opd_ent_(), access_from_map_(), has14_(), stub_table_() + { } + + ~Powerpc_relobj() + { } + + // The .got2 section shndx. + unsigned int + got2_shndx() const + { + if (size == 32) + return this->special_; + else + return 0; + } + + // The .opd section shndx. + unsigned int + opd_shndx() const + { + if (size == 32) + return 0; + else + return this->special_; + } + + // Init OPD entry arrays. + void + init_opd(size_t opd_size) + { + size_t count = this->opd_ent_ndx(opd_size); + this->opd_ent_.resize(count); + } + + // Return section and offset of function entry for .opd + R_OFF. + unsigned int + get_opd_ent(Address r_off, Address* value = NULL) const + { + size_t ndx = this->opd_ent_ndx(r_off); + gold_assert(ndx < this->opd_ent_.size()); + gold_assert(this->opd_ent_[ndx].shndx != 0); + if (value != NULL) + *value = this->opd_ent_[ndx].off; + return this->opd_ent_[ndx].shndx; + } + + // Set section and offset of function entry for .opd + R_OFF. + void + set_opd_ent(Address r_off, unsigned int shndx, Address value) + { + size_t ndx = this->opd_ent_ndx(r_off); + gold_assert(ndx < this->opd_ent_.size()); + this->opd_ent_[ndx].shndx = shndx; + this->opd_ent_[ndx].off = value; + } + + // Return discard flag for .opd + R_OFF. + bool + get_opd_discard(Address r_off) const + { + size_t ndx = this->opd_ent_ndx(r_off); + gold_assert(ndx < this->opd_ent_.size()); + return this->opd_ent_[ndx].discard; + } + + // Set discard flag for .opd + R_OFF. + void + set_opd_discard(Address r_off) + { + size_t ndx = this->opd_ent_ndx(r_off); + gold_assert(ndx < this->opd_ent_.size()); + this->opd_ent_[ndx].discard = true; + } + + Access_from* + access_from_map() + { return &this->access_from_map_; } + + // Add a reference from SRC_OBJ, SRC_INDX to this object's .opd + // section at DST_OFF. + void + add_reference(Object* src_obj, + unsigned int src_indx, + typename elfcpp::Elf_types::Elf_Addr dst_off) + { + Section_id src_id(src_obj, src_indx); + this->access_from_map_[dst_off].insert(src_id); + } + + // Add a reference to the code section specified by the .opd entry + // at DST_OFF + void + add_gc_mark(typename elfcpp::Elf_types::Elf_Addr dst_off) + { + size_t ndx = this->opd_ent_ndx(dst_off); + if (ndx >= this->opd_ent_.size()) + this->opd_ent_.resize(ndx + 1); + this->opd_ent_[ndx].gc_mark = true; + } + + void + process_gc_mark(Symbol_table* symtab) + { + for (size_t i = 0; i < this->opd_ent_.size(); i++) + if (this->opd_ent_[i].gc_mark) + { + unsigned int shndx = this->opd_ent_[i].shndx; + symtab->gc()->worklist().push(Section_id(this, shndx)); + } + } + + bool + opd_valid() const + { return this->opd_valid_; } + + void + set_opd_valid() + { this->opd_valid_ = true; } + + // Examine .rela.opd to build info about function entry points. + void + scan_opd_relocs(size_t reloc_count, + const unsigned char* prelocs, + const unsigned char* plocal_syms); + + // 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* lv) const + { + if (size == 64 && this->opd_shndx() != 0) + { + bool is_ordinary; + if (lv->input_shndx(&is_ordinary) != this->opd_shndx()) + return true; + if (this->get_opd_discard(lv->input_value())) + return false; + } + return true; + } + + // Return offset in output GOT section that this object will use + // as a TOC pointer. Won't be just a constant with multi-toc support. + Address + toc_base_offset() const + { return 0x8000; } + + 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* stub_table) + { + if (shndx >= this->stub_table_.size()) + this->stub_table_.resize(shndx + 1); + this->stub_table_[shndx] = stub_table; + } + + Stub_table* + stub_table(unsigned int shndx) + { + if (shndx < this->stub_table_.size()) + return this->stub_table_[shndx]; + return NULL; + } + +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_; + + // 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 has14_; + + // The stub table to use for a given input section. + std::vector*> stub_table_; +}; + template class Target_powerpc : public Sized_target { public: - typedef Output_data_reloc Reloc_section; + typedef + Output_data_reloc Reloc_section; + typedef typename elfcpp::Elf_types::Elf_Addr Address; + typedef typename elfcpp::Elf_types::Elf_Swxword Signed_address; + static const Address invalid_address = static_cast
(0) - 1; + // Offset of tp and dtp pointers from start of TLS block. + static const Address tp_offset = 0x7000; + static const Address dtp_offset = 0x8000; Target_powerpc() : Sized_target(&powerpc_info), - got_(NULL), got2_(NULL), toc_(NULL), - plt_(NULL), rela_dyn_(NULL), - copy_relocs_(elfcpp::R_POWERPC_COPY), - dynbss_(NULL), got_mod_index_offset_(-1U) + got_(NULL), plt_(NULL), iplt_(NULL), brlt_section_(NULL), + glink_(NULL), rela_dyn_(NULL), copy_relocs_(elfcpp::R_POWERPC_COPY), + dynbss_(NULL), tlsld_got_offset_(-1U), + stub_tables_(), branch_lookup_table_(), branch_info_(), + plt_thread_safe_(false) { } - // Process the relocations to determine unreferenced sections for + // Process the relocations to determine unreferenced sections for // garbage collection. void gc_process_relocs(Symbol_table* symtab, - Layout* layout, - Sized_relobj* 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); + Layout* layout, + Sized_relobj_file* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols); // Scan the relocations to look for symbol adjustments. void scan_relocs(Symbol_table* symtab, Layout* layout, - Sized_relobj* object, + Sized_relobj_file* object, unsigned int data_shndx, unsigned int sh_type, const unsigned char* prelocs, @@ -90,6 +370,55 @@ class Target_powerpc : public Sized_target 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* 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* + new_stub_table(); + + void + do_define_standard_symbols(Symbol_table*, Layout*); + // Finalize the sections. void do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); @@ -99,6 +428,26 @@ class Target_powerpc : public Sized_target uint64_t do_dynsym_value(const Symbol*) const; + // Return the PLT address to use for a local symbol. + uint64_t + do_plt_address_for_local(const Relobj*, unsigned int) const; + + // Return the PLT address to use for a global symbol. + uint64_t + do_plt_address_for_global(const Symbol*) const; + + // Return the offset to use for the GOT_INDX'th got entry which is + // for a local tls symbol specified by OBJECT, SYMNDX. + int64_t + do_tls_offset_for_local(const Relobj* object, + unsigned int symndx, + unsigned int got_indx) const; + + // Return the offset to use for the GOT_INDX'th got entry which is + // for global tls symbol GSYM. + int64_t + do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const; + // Relocate a section. void relocate_section(const Relocate_info*, @@ -108,7 +457,7 @@ class Target_powerpc : public Sized_target Output_section* output_section, bool needs_special_offset_handling, unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr view_address, + Address view_address, section_size_type view_size, const Reloc_symbol_changes*); @@ -116,7 +465,7 @@ class Target_powerpc : public Sized_target void scan_relocatable_relocs(Symbol_table* symtab, Layout* layout, - Sized_relobj* object, + Sized_relobj_file* object, unsigned int data_shndx, unsigned int sh_type, const unsigned char* prelocs, @@ -127,69 +476,308 @@ class Target_powerpc : public Sized_target const unsigned char* plocal_symbols, Relocatable_relocs*); - // Relocate a section during a relocatable link. - void - relocate_for_relocatable(const Relocate_info*, - unsigned int sh_type, - const unsigned char* prelocs, - size_t reloc_count, - Output_section* output_section, - off_t offset_in_output_section, - const Relocatable_relocs*, - unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr view_address, - section_size_type view_size, - unsigned char* reloc_view, - section_size_type reloc_view_size); + // Emit relocations for a section. + void + relocate_relocs(const Relocate_info*, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + typename elfcpp::Elf_types::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 strcmp(sym->name(), "__tls_get_addr") == 0; } // Return the size of the GOT section. section_size_type - got_size() + got_size() const { gold_assert(this->got_ != NULL); return this->got_->data_size(); } + // Get the PLT section. + const Output_data_plt_powerpc* + plt_section() const + { + gold_assert(this->plt_ != NULL); + return this->plt_; + } + + // Get the IPLT section. + const Output_data_plt_powerpc* + iplt_section() const + { + gold_assert(this->iplt_ != NULL); + return this->iplt_; + } + + // Get the .glink section. + const Output_data_glink* + glink_section() const + { + gold_assert(this->glink_ != NULL); + return this->glink_; + } + + bool has_glink() const + { return this->glink_ != NULL; } + + // Get the GOT section. + const Output_data_got_powerpc* + got_section() const + { + gold_assert(this->got_ != NULL); + return this->got_; + } + + // Get the GOT section, creating it if necessary. + Output_data_got_powerpc* + got_section(Symbol_table*, Layout*); + + Object* + do_make_elf_object(const std::string&, Input_file*, off_t, + const elfcpp::Ehdr&); + + // Return the number of entries in the GOT. + unsigned int + got_entry_count() const + { + if (this->got_ == NULL) + return 0; + return this->got_size() / (size / 8); + } + + // Return the number of entries in the PLT. + unsigned int + plt_entry_count() const; + + // Return the offset of the first non-reserved PLT entry. + unsigned int + first_plt_entry_offset() const; + + // Return the size of each PLT entry. + unsigned int + plt_entry_size() const; + + // Add any special sections for this symbol to the gc work list. + // For powerpc64, this adds the code section of a function + // descriptor. + void + do_gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const; + + // Handle target specific gc actions when adding a gc reference from + // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX + // and DST_OFF. For powerpc64, this adds a referenc to the code + // section of a function descriptor. + void + do_gc_add_reference(Symbol_table* symtab, + Object* src_obj, + unsigned int src_shndx, + Object* dst_obj, + unsigned int dst_shndx, + Address dst_off) const; + + typedef std::vector*> Stub_tables; + const Stub_tables& + stub_tables() const + { return this->stub_tables_; } + + const Output_data_brlt_powerpc* + 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<32, big_endian>::writeval(oview + p->second, p->first); + } + } + + bool + plt_thread_safe() const + { return this->plt_thread_safe_; } + 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* 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* relinfo_; + size_t relnum_; + Address r_offset_; + }; + // The class which scans relocations. - class Scan + class Scan : protected Track_tls { public: + typedef typename elfcpp::Elf_types::Elf_Addr Address; + Scan() - : issued_non_pic_error_(false) + : Track_tls(), issued_non_pic_error_(false) { } + static inline int + get_reference_flags(unsigned int r_type); + inline void local(Symbol_table* symtab, Layout* layout, Target_powerpc* target, - Sized_relobj* object, + Sized_relobj_file* object, unsigned int data_shndx, Output_section* output_section, const elfcpp::Rela& reloc, unsigned int r_type, - const elfcpp::Sym& lsym); + const elfcpp::Sym& lsym, + bool is_discarded); inline void global(Symbol_table* symtab, Layout* layout, Target_powerpc* target, - Sized_relobj* object, + Sized_relobj_file* object, unsigned int data_shndx, Output_section* output_section, const elfcpp::Rela& reloc, unsigned int r_type, Symbol* gsym); + inline bool + local_reloc_may_be_function_pointer(Symbol_table* , Layout* , + Target_powerpc* , + Sized_relobj_file* , + unsigned int , + Output_section* , + const elfcpp::Rela& , + unsigned int , + const elfcpp::Sym&) + { return false; } + + inline bool + global_reloc_may_be_function_pointer(Symbol_table* , Layout* , + Target_powerpc* , + Sized_relobj_file* , + unsigned int , + Output_section* , + const elfcpp::Rela& , + unsigned int , Symbol*) + { return false; } + private: static void - unsupported_reloc_local(Sized_relobj*, + unsupported_reloc_local(Sized_relobj_file*, unsigned int r_type); static void - unsupported_reloc_global(Sized_relobj*, + unsupported_reloc_global(Sized_relobj_file*, unsigned int r_type, Symbol*); static void @@ -199,14 +787,31 @@ class Target_powerpc : public Sized_target void check_non_pic(Relobj*, unsigned int r_type); + bool + reloc_needs_plt_for_ifunc(Sized_relobj_file* object, + unsigned int r_type); + // Whether we have issued an error about a non-PIC compilation. bool issued_non_pic_error_; }; + Address + symval_for_branch(Address value, const Sized_symbol* gsym, + Powerpc_relobj* object, + unsigned int *dest_shndx); + // The class which implements relocation. - class Relocate + 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 @@ -218,18 +823,32 @@ class Target_powerpc : public Sized_target unsigned char*, typename elfcpp::Elf_types::Elf_Addr, section_size_type); + }; - private: - // Do a TLS relocation. - inline void - relocate_tls(const Relocate_info*, - Target_powerpc* target, - size_t relnum, const elfcpp::Rela&, - unsigned int r_type, const Sized_symbol*, - const Symbol_value*, - unsigned char*, - typename elfcpp::Elf_types::Elf_Addr, - section_size_type); + 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, @@ -238,43 +857,82 @@ class Target_powerpc : public Sized_target { public: unsigned int - get_size_for_reloc(unsigned int, Relobj*); + get_size_for_reloc(unsigned int, Relobj*) + { + gold_unreachable(); + return 0; + } }; - // Get the GOT section, creating it if necessary. - Output_data_got* - got_section(Symbol_table*, Layout*); + // 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. - Output_data_space* - got2_section() const + tls::Tls_optimization + optimize_tls_gd(bool is_final) { - gold_assert (this->got2_ != NULL); - return this->got2_; + // 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; } - // Get the TOC section. - Output_data_space* - toc_section() const + tls::Tls_optimization + optimize_tls_ld() { - gold_assert (this->toc_ != NULL); - return this->toc_; + 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 GOT entry for the TLS module index. + // Create a PLT entry for a local IFUNC symbol. + void + make_local_ifunc_plt_entry(Symbol_table*, Layout*, + Sized_relobj_file*, + unsigned int); + + + // Create a GOT entry for local dynamic __tls_get_addr. unsigned int - got_mod_index_entry(Symbol_table* symtab, Layout* layout, - Sized_relobj* object); + tlsld_got_offset(Symbol_table* symtab, Layout* layout, + Sized_relobj_file* object); - // Get the PLT section. - const Output_data_plt_powerpc* - plt_section() const + unsigned int + tlsld_got_offset() const { - gold_assert(this->plt_ != NULL); - return this->plt_; + return this->tlsld_got_offset_; } // Get the dynamic reloc section, creating it if necessary. @@ -284,7 +942,7 @@ class Target_powerpc : public Sized_target // Copy a relocation against a global symbol. void copy_reloc(Symbol_table* symtab, Layout* layout, - Sized_relobj* object, + Sized_relobj_file* object, unsigned int shndx, Output_section* output_section, Symbol* sym, const elfcpp::Rela& reloc) { @@ -294,34 +952,94 @@ class Target_powerpc : public Sized_target reloc, this->rela_dyn_section(layout)); } - // Information about this specific target which we pass to the - // general Target structure. + // Look over all the input sections, deciding where to place stub. + 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* 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*, + Stub_table*, + Symbol_table*) const; + + private: + // The branch location.. + Powerpc_relobj* 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 = 0, // GOT entry for a regular symbol - GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset - GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair + GOT_TYPE_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* got_; - // The GOT2 section. - Output_data_space* got2_; - // The TOC section. - Output_data_space* toc_; + Output_data_got_powerpc* got_; // The PLT section. Output_data_plt_powerpc* plt_; + // The IPLT section. + Output_data_plt_powerpc* iplt_; + // Section holding long branch destinations. + Output_data_brlt_powerpc* brlt_section_; + // The .glink section. + Output_data_glink* glink_; // The dynamic reloc section. Reloc_section* rela_dyn_; // Relocs saved to avoid a COPY reloc. Copy_relocs copy_relocs_; // Space for variables copied with a COPY reloc. Output_data_space* dynbss_; - // Offset of the GOT entry for the TLS module index; - unsigned int got_mod_index_offset_; + // Offset of the GOT entry for local dynamic __tls_get_addr calls. + unsigned int tlsld_got_offset_; + + Stub_tables stub_tables_; + typedef Unordered_map Branch_lookup_table; + Branch_lookup_table branch_lookup_table_; + + typedef std::vector Branches; + Branches branch_info_; + + bool plt_thread_safe_; }; template<> @@ -334,11 +1052,14 @@ Target::Target_info Target_powerpc<32, true>::powerpc_info = 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 @@ -357,11 +1078,14 @@ Target::Target_info Target_powerpc<32, false>::powerpc_info = 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 @@ -380,11 +1104,14 @@ Target::Target_info Target_powerpc<64, true>::powerpc_info = 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) - 8 * 1024, // common_pagesize (overridable by -z common-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 @@ -403,11 +1130,14 @@ Target::Target_info Target_powerpc<64, false>::powerpc_info = 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) - 8 * 1024, // common_pagesize (overridable by -z common-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 @@ -416,295 +1146,718 @@ Target::Target_info Target_powerpc<64, false>::powerpc_info = NULL // attributes_vendor }; +inline bool +is_branch_reloc(unsigned int r_type) +{ + return (r_type == elfcpp::R_POWERPC_REL24 + || r_type == elfcpp::R_PPC_PLTREL24 + || r_type == elfcpp::R_PPC_LOCAL24PC + || r_type == elfcpp::R_POWERPC_REL14 + || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN + || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN + || r_type == elfcpp::R_POWERPC_ADDR24 + || r_type == elfcpp::R_POWERPC_ADDR14 + || r_type == elfcpp::R_POWERPC_ADDR14_BRTAKEN + || r_type == elfcpp::R_POWERPC_ADDR14_BRNTAKEN); +} + +// If INSN is an opcode that may be used with an @tls operand, return +// the transformed insn for TLS optimisation, otherwise return 0. If +// REG is non-zero only match an insn with RB or RA equal to REG. +uint32_t +at_tls_transform(uint32_t insn, unsigned int reg) +{ + if ((insn & (0x3f << 26)) != 31 << 26) + return 0; + + unsigned int rtra; + if (reg == 0 || ((insn >> 11) & 0x1f) == reg) + rtra = insn & ((1 << 26) - (1 << 16)); + else if (((insn >> 16) & 0x1f) == reg) + rtra = (insn & (0x1f << 21)) | ((insn & (0x1f << 11)) << 5); + else + return 0; + + if ((insn & (0x3ff << 1)) == 266 << 1) + // add -> addi + insn = 14 << 26; + else if ((insn & (0x1f << 1)) == 23 << 1 + && ((insn & (0x1f << 6)) < 14 << 6 + || ((insn & (0x1f << 6)) >= 16 << 6 + && (insn & (0x1f << 6)) < 24 << 6))) + // load and store indexed -> dform + insn = (32 | ((insn >> 6) & 0x1f)) << 26; + else if ((insn & (((0x1a << 5) | 0x1f) << 1)) == 21 << 1) + // ldx, ldux, stdx, stdux -> ld, ldu, std, stdu + insn = ((58 | ((insn >> 6) & 4)) << 26) | ((insn >> 6) & 1); + else if ((insn & (((0x1f << 5) | 0x1f) << 1)) == 341 << 1) + // lwax -> lwa + insn = (58 << 26) | 2; + else + return 0; + insn |= rtra; + return insn; +} + +// Modified version of symtab.h class Symbol member +// Given a direct absolute or pc-relative static relocation against +// the global symbol, this function returns whether a dynamic relocation +// is needed. + +template +bool +needs_dynamic_reloc(const Symbol* gsym, int flags) +{ + // No dynamic relocations in a static link! + if (parameters->doing_static_link()) + return false; + + // A reference to an undefined symbol from an executable should be + // statically resolved to 0, and does not need a dynamic relocation. + // This matches gnu ld behavior. + if (gsym->is_undefined() && !parameters->options().shared()) + return false; + + // A reference to an absolute symbol does not need a dynamic relocation. + if (gsym->is_absolute()) + return false; + + // An absolute reference within a position-independent output file + // will need a dynamic relocation. + if ((flags & Symbol::ABSOLUTE_REF) + && parameters->options().output_is_position_independent()) + return true; + + // A function call that can branch to a local PLT entry does not need + // a dynamic relocation. + if ((flags & Symbol::FUNCTION_CALL) && gsym->has_plt_offset()) + return false; + + // A reference to any PLT entry in a non-position-independent executable + // does not need a dynamic relocation. + // Except due to having function descriptors on powerpc64 we don't define + // functions to their plt code in an executable, so this doesn't apply. + if (size == 32 + && !parameters->options().output_is_position_independent() + && gsym->has_plt_offset()) + return false; + + // A reference to a symbol defined in a dynamic object or to a + // symbol that is preemptible will need a dynamic relocation. + if (gsym->is_from_dynobj() + || gsym->is_undefined() + || gsym->is_preemptible()) + return true; + + // For all other cases, return FALSE. + return false; +} + +// Modified version of symtab.h class Symbol member +// Whether we should use the PLT offset associated with a symbol for +// a relocation. FLAGS is a set of Reference_flags. + +template +bool +use_plt_offset(const Symbol* gsym, int flags) +{ + // If the symbol doesn't have a PLT offset, then naturally we + // don't want to use it. + if (!gsym->has_plt_offset()) + return false; + + // For a STT_GNU_IFUNC symbol we always have to use the PLT entry. + if (gsym->type() == elfcpp::STT_GNU_IFUNC) + return true; + + // If we are going to generate a dynamic relocation, then we will + // wind up using that, so no need to use the PLT entry. + if (needs_dynamic_reloc(gsym, flags)) + return false; + + // If the symbol is from a dynamic object, we need to use the PLT + // entry. + if (gsym->is_from_dynobj()) + return true; + + // If we are generating a shared object, and this symbol is + // undefined or preemptible, we need to use the PLT entry. + if (parameters->options().shared() + && (gsym->is_undefined() || gsym->is_preemptible())) + return true; + + // If this is a call to a weak undefined symbol, we need to use + // the PLT entry; the symbol may be defined by a library loaded + // at runtime. + if ((flags & Symbol::FUNCTION_CALL) && gsym->is_weak_undefined()) + return true; + + // Otherwise we can use the regular definition. + return false; +} + template class Powerpc_relocate_functions { -private: - // Do a simple relocation with the addend in the relocation. - template - static inline void - rela(unsigned char* view, - unsigned int right_shift, - elfcpp::Elf_Xword dst_mask, - typename elfcpp::Swap::Valtype value, - typename elfcpp::Swap::Valtype addend) +public: + enum Overflow_check { - typedef typename elfcpp::Swap::Valtype Valtype; - Valtype* wv = reinterpret_cast(view); - Valtype val = elfcpp::Swap::readval(wv); - Valtype reloc = ((value + addend) >> right_shift); + CHECK_NONE, + CHECK_SIGNED, + CHECK_BITFIELD + }; - val &= ~dst_mask; - reloc &= dst_mask; + enum Status + { + STATUS_OK, + STATUS_OVERFLOW + }; - elfcpp::Swap::writeval(wv, val | reloc); - } +private: + typedef Powerpc_relocate_functions This; + typedef typename elfcpp::Elf_types::Elf_Addr Address; - // Do a simple relocation using a symbol value with the addend in - // the relocation. template - static inline void - rela(unsigned char* view, - unsigned int right_shift, - elfcpp::Elf_Xword dst_mask, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Swap::Valtype addend) + static inline bool + has_overflow_signed(Address value) { - typedef typename elfcpp::Swap::Valtype Valtype; - Valtype* wv = reinterpret_cast(view); - Valtype val = elfcpp::Swap::readval(wv); - Valtype reloc = (psymval->value(object, addend) >> right_shift); - - val &= ~dst_mask; - reloc &= dst_mask; - - elfcpp::Swap::writeval(wv, val | reloc); + // limit = 1 << (valsize - 1) without shift count exceeding size of type + Address limit = static_cast
(1) << ((valsize - 1) >> 1); + limit <<= ((valsize - 1) >> 1); + limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); + return value + limit > (limit << 1) - 1; } - // Do a simple relocation using a symbol value with the addend in - // the relocation, unaligned. template - static inline void - rela_ua(unsigned char* view, unsigned int right_shift, - elfcpp::Elf_Xword dst_mask, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Swap::Valtype addend) - { - typedef typename elfcpp::Swap_unaligned::Valtype Valtype; - unsigned char* wv = view; - Valtype val = elfcpp::Swap_unaligned::readval(wv); - Valtype reloc = (psymval->value(object, addend) >> right_shift); + static inline bool + has_overflow_bitfield(Address value) + { + Address limit = static_cast
(1) << ((valsize - 1) >> 1); + limit <<= ((valsize - 1) >> 1); + limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); + return value > (limit << 1) - 1 && value + limit > (limit << 1) - 1; + } - val &= ~dst_mask; - reloc &= dst_mask; + template + static inline Status + overflowed(Address value, Overflow_check overflow) + { + if (overflow == CHECK_SIGNED) + { + if (has_overflow_signed(value)) + return STATUS_OVERFLOW; + } + else if (overflow == CHECK_BITFIELD) + { + if (has_overflow_bitfield(value)) + return STATUS_OVERFLOW; + } + return STATUS_OK; + } - elfcpp::Swap_unaligned::writeval(wv, val | reloc); + // Do a simple RELA relocation + template + static inline Status + rela(unsigned char* view, Address value, Overflow_check overflow) + { + typedef typename elfcpp::Swap::Valtype Valtype; + Valtype* wv = reinterpret_cast(view); + elfcpp::Swap::writeval(wv, value); + return overflowed(value, overflow); } - // Do a simple PC relative relocation with a Symbol_value with the - // addend in the relocation. template - static inline void - pcrela(unsigned char* view, unsigned int right_shift, - elfcpp::Elf_Xword dst_mask, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Swap::Valtype addend, - typename elfcpp::Elf_types::Elf_Addr address) + static inline Status + rela(unsigned char* view, + unsigned int right_shift, + typename elfcpp::Valtype_base::Valtype dst_mask, + Address value, + Overflow_check overflow) { typedef typename elfcpp::Swap::Valtype Valtype; Valtype* wv = reinterpret_cast(view); Valtype val = elfcpp::Swap::readval(wv); - Valtype reloc = ((psymval->value(object, addend) - address) - >> right_shift); - + Valtype reloc = value >> right_shift; val &= ~dst_mask; reloc &= dst_mask; - elfcpp::Swap::writeval(wv, val | reloc); + return overflowed(value >> right_shift, overflow); } + // Do a simple RELA relocation, unaligned. template - static inline void - pcrela_unaligned(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Swap::Valtype addend, - typename elfcpp::Elf_types::Elf_Addr address) + static inline Status + rela_ua(unsigned char* view, Address value, Overflow_check overflow) { - typedef typename elfcpp::Swap_unaligned::Valtype Valtype; - unsigned char* wv = view; - Valtype reloc = (psymval->value(object, addend) - address); + elfcpp::Swap_unaligned::writeval(view, value); + return overflowed(value, overflow); + } - elfcpp::Swap_unaligned::writeval(wv, reloc); + template + static inline Status + rela_ua(unsigned char* view, + unsigned int right_shift, + typename elfcpp::Valtype_base::Valtype dst_mask, + Address value, + Overflow_check overflow) + { + typedef typename elfcpp::Swap_unaligned::Valtype + Valtype; + Valtype val = elfcpp::Swap::readval(view); + Valtype reloc = value >> right_shift; + val &= ~dst_mask; + reloc &= dst_mask; + elfcpp::Swap_unaligned::writeval(view, val | reloc); + return overflowed(value >> right_shift, overflow); } - typedef Powerpc_relocate_functions This; - typedef Relocate_functions This_reloc; public: - // R_POWERPC_REL32: (Symbol + Addend - Address) - static inline void - rel32(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend, - typename elfcpp::Elf_types::Elf_Addr address) - { This_reloc::pcrela32(view, object, psymval, addend, address); } - - // R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc + // R_PPC64_ADDR64: (Symbol + Addend) static inline void - rel24(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend, - typename elfcpp::Elf_types::Elf_Addr address) - { - This::template pcrela<32>(view, 0, 0x03fffffc, object, - psymval, addend, address); - } + addr64(unsigned char* view, Address value) + { This::template rela<64>(view, value, CHECK_NONE); } - // R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc + // R_PPC64_UADDR64: (Symbol + Addend) unaligned static inline void - rel14(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend, - typename elfcpp::Elf_types::Elf_Addr address) + addr64_u(unsigned char* view, Address value) + { This::template rela_ua<64>(view, value, CHECK_NONE); } + + // R_POWERPC_ADDR32: (Symbol + Addend) + static inline Status + addr32(unsigned char* view, Address value, Overflow_check overflow) + { return This::template rela<32>(view, value, overflow); } + + // R_POWERPC_UADDR32: (Symbol + Addend) unaligned + static inline Status + addr32_u(unsigned char* view, Address value, Overflow_check overflow) + { return This::template rela_ua<32>(view, value, overflow); } + + // R_POWERPC_ADDR24: (Symbol + Addend) & 0x3fffffc + static inline Status + addr24(unsigned char* view, Address value, Overflow_check overflow) { - This::template pcrela<32>(view, 0, 0x0000fffc, object, - psymval, addend, address); + Status stat = This::template rela<32>(view, 0, 0x03fffffc, value, overflow); + if (overflow != CHECK_NONE && (value & 3) != 0) + stat = STATUS_OVERFLOW; + return stat; } // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff - static inline void - addr16(unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr value, - typename elfcpp::Elf_types::Elf_Addr addend) - { This_reloc::rela16(view, value, addend); } + static inline Status + addr16(unsigned char* view, Address value, Overflow_check overflow) + { return This::template rela<16>(view, value, overflow); } - static inline void - addr16(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend) - { This_reloc::rela16(view, object, psymval, addend); } + // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff, unaligned + static inline Status + addr16_u(unsigned char* view, Address value, Overflow_check overflow) + { return This::template rela_ua<16>(view, value, overflow); } // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc - static inline void - addr16_ds(unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr value, - typename elfcpp::Elf_types::Elf_Addr addend) + static inline Status + addr16_ds(unsigned char* view, Address value, Overflow_check overflow) { - This::template rela<16>(view, 0, 0xfffc, value, addend); + Status stat = This::template rela<16>(view, 0, 0xfffc, value, overflow); + if (overflow != CHECK_NONE && (value & 3) != 0) + stat = STATUS_OVERFLOW; + return stat; } - // R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff + // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff + static inline void + addr16_hi(unsigned char* view, Address value) + { This::template rela<16>(view, 16, 0xffff, value, CHECK_NONE); } + + // R_POWERPC_ADDR16_HA: ((Symbol + Addend + 0x8000) >> 16) & 0xffff static inline void - addr16_lo(unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr value, - typename elfcpp::Elf_types::Elf_Addr addend) - { This_reloc::rela16(view, value, addend); } + 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_lo(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend) - { This_reloc::rela16(view, object, psymval, addend); } + addr16_hi2(unsigned char* view, Address value) + { This::template rela<16>(view, 32, 0xffff, value, CHECK_NONE); } - // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff + // R_POWERPC_ADDR16_HIGHERA: ((Symbol + Addend + 0x8000) >> 32) & 0xffff static inline void - addr16_hi(unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr value, - typename elfcpp::Elf_types::Elf_Addr addend) - { - This::template rela<16>(view, 16, 0xffff, value, addend); - } + 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_hi(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend) - { - This::template rela<16>(view, 16, 0xffff, object, psymval, addend); - } + addr16_hi3(unsigned char* view, Address value) + { This::template rela<16>(view, 48, 0xffff, value, CHECK_NONE); } - // R_POWERPC_ADDR16_HA: Same as R_POWERPC_ADDR16_HI except that if the - // final value of the low 16 bits of the - // relocation is negative, add one. + // R_POWERPC_ADDR16_HIGHESTA: ((Symbol + Addend + 0x8000) >> 48) & 0xffff static inline void - addr16_ha(unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr value, - typename elfcpp::Elf_types::Elf_Addr addend) + 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) { - typename elfcpp::Elf_types::Elf_Addr reloc; + Status stat = This::template rela<32>(view, 0, 0xfffc, value, overflow); + if (overflow != CHECK_NONE && (value & 3) != 0) + stat = STATUS_OVERFLOW; + return stat; + } +}; + +// Stash away the index of .got2 or .opd in a relocatable object, if +// such a section exists. + +template +bool +Powerpc_relobj::do_find_special_sections( + Read_symbols_data* sd) +{ + const unsigned char* const pshdrs = sd->section_headers->data(); + const unsigned char* namesu = sd->section_names->data(); + const char* names = reinterpret_cast(namesu); + section_size_type names_size = sd->section_names_size; + const unsigned char* s; + + s = this->find_shdr(pshdrs, size == 32 ? ".got2" : ".opd", + names, names_size, NULL); + if (s != NULL) + { + unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes::shdr_size; + this->special_ = ndx; + } + return Sized_relobj_file::do_find_special_sections(sd); +} + +// Examine .rela.opd to build info about function entry points. + +template +void +Powerpc_relobj::scan_opd_relocs( + size_t reloc_count, + const unsigned char* prelocs, + const unsigned char* plocal_syms) +{ + if (size == 64) + { + typedef typename Reloc_types::Reloc + Reltype; + const int reloc_size + = Reloc_types::reloc_size; + const int sym_size = elfcpp::Elf_sizes::sym_size; + Address expected_off = 0; + bool regular = true; + unsigned int opd_ent_size = 0; + + for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) + { + Reltype reloc(prelocs); + typename elfcpp::Elf_types::Elf_WXword r_info + = reloc.get_r_info(); + unsigned int r_type = elfcpp::elf_r_type(r_info); + if (r_type == elfcpp::R_PPC64_ADDR64) + { + unsigned int r_sym = elfcpp::elf_r_sym(r_info); + typename elfcpp::Elf_types::Elf_Addr value; + bool is_ordinary; + unsigned int shndx; + if (r_sym < this->local_symbol_count()) + { + typename elfcpp::Sym + lsym(plocal_syms + r_sym * sym_size); + shndx = lsym.get_st_shndx(); + shndx = this->adjust_sym_shndx(r_sym, shndx, &is_ordinary); + value = lsym.get_st_value(); + } + else + shndx = this->symbol_section_and_value(r_sym, &value, + &is_ordinary); + this->set_opd_ent(reloc.get_r_offset(), shndx, + value + reloc.get_r_addend()); + if (i == 2) + { + expected_off = reloc.get_r_offset(); + opd_ent_size = expected_off; + } + else if (expected_off != reloc.get_r_offset()) + regular = false; + expected_off += opd_ent_size; + } + else if (r_type == elfcpp::R_PPC64_TOC) + { + if (expected_off - opd_ent_size + 8 != reloc.get_r_offset()) + regular = false; + } + else + { + gold_warning(_("%s: unexpected reloc type %u in .opd section"), + this->name().c_str(), r_type); + regular = false; + } + } + if (reloc_count <= 2) + opd_ent_size = this->section_size(this->opd_shndx()); + if (opd_ent_size != 24 && opd_ent_size != 16) + regular = false; + if (!regular) + { + gold_warning(_("%s: .opd is not a regular array of opd entries"), + this->name().c_str()); + opd_ent_size = 0; + } + } +} + +template +void +Powerpc_relobj::do_read_relocs(Read_relocs_data* rd) +{ + Sized_relobj_file::do_read_relocs(rd); + if (size == 64) + { + for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); + p != rd->relocs.end(); + ++p) + { + if (p->data_shndx == this->opd_shndx()) + { + uint64_t opd_size = this->section_size(this->opd_shndx()); + gold_assert(opd_size == static_cast(opd_size)); + if (opd_size != 0) + { + this->init_opd(opd_size); + this->scan_opd_relocs(p->reloc_count, p->contents->data(), + rd->local_symbols->data()); + } + break; + } + } + } +} + +// Set up some symbols. + +template +void +Target_powerpc::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* target = + static_cast*>( + parameters->sized_target()); + Output_data_got_powerpc* 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); + } + } +} + +// Set up PowerPC target specific relobj. - reloc = value + addend; +template +Object* +Target_powerpc::do_make_elf_object( + const std::string& name, + Input_file* input_file, + off_t offset, const elfcpp::Ehdr& ehdr) +{ + int et = ehdr.get_e_type(); + // ET_EXEC files are valid input for --just-symbols/-R, + // and we treat them as relocatable objects. + if (et == elfcpp::ET_REL + || (et == elfcpp::ET_EXEC && input_file->just_symbols())) + { + Powerpc_relobj* obj = + new Powerpc_relobj(name, input_file, offset, ehdr); + obj->setup(); + return obj; + } + else if (et == elfcpp::ET_DYN) + { + Sized_dynobj* obj = + new Sized_dynobj(name, input_file, offset, ehdr); + obj->setup(); + return obj; + } + else + { + gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et); + return NULL; + } +} + +template +class Output_data_got_powerpc : public Output_data_got +{ +public: + typedef typename elfcpp::Elf_types::Elf_Addr Valtype; + typedef Output_data_reloc Rela_dyn; + + Output_data_got_powerpc(Symbol_table* symtab, Layout* layout) + : Output_data_got(), + symtab_(symtab), layout_(layout), + header_ent_cnt_(size == 32 ? 3 : 1), + header_index_(size == 32 ? 0x2000 : 0) + { } - if (reloc & 0x8000) - reloc += 0x10000; - reloc >>= 16; + class Got_entry; - elfcpp::Swap<16, big_endian>::writeval(view, reloc); + // Create a new GOT entry and return its offset. + unsigned int + add_got_entry(Got_entry got_entry) + { + this->reserve_ent(); + return Output_data_got::add_got_entry(got_entry); } - static inline void - addr16_ha(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend) + // Create a pair of new GOT entries and return the offset of the first. + unsigned int + add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2) { - typename elfcpp::Elf_types::Elf_Addr reloc; + this->reserve_ent(2); + return Output_data_got::add_got_entry_pair(got_entry_1, + got_entry_2); + } - reloc = psymval->value(object, addend); + unsigned int + add_constant_pair(Valtype c1, Valtype c2) + { + this->reserve_ent(2); + unsigned int got_offset = this->add_constant(c1); + this->add_constant(c2); + return got_offset; + } - if (reloc & 0x8000) - reloc += 0x10000; - reloc >>= 16; + // Offset of _GLOBAL_OFFSET_TABLE_. + unsigned int + g_o_t() const + { + return this->got_offset(this->header_index_); + } - elfcpp::Swap<16, big_endian>::writeval(view, reloc); + // 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* object) const + { + if (size == 32) + return this->g_o_t(); + else + return (this->output_section()->address() + + object->toc_base_offset() + - this->address()); } - // R_PPC_REL16: (Symbol + Addend - Address) & 0xffff - static inline void - rel16(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend, - typename elfcpp::Elf_types::Elf_Addr address) - { This_reloc::pcrela16(view, object, psymval, addend, address); } - - // R_PPC_REL16_LO: (Symbol + Addend - Address) & 0xffff - static inline void - rel16_lo(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend, - typename elfcpp::Elf_types::Elf_Addr address) - { This_reloc::pcrela16(view, object, psymval, addend, address); } - - // R_PPC_REL16_HI: ((Symbol + Addend - Address) >> 16) & 0xffff - static inline void - rel16_hi(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend, - typename elfcpp::Elf_types::Elf_Addr address) + // Ensure our GOT has a header. + void + set_final_data_size() { - This::template pcrela<16>(view, 16, 0xffff, object, - psymval, addend, address); + if (this->header_ent_cnt_ != 0) + this->make_header(); + Output_data_got::set_final_data_size(); } - // R_PPC_REL16_HA: Same as R_PPC_REL16_HI except that if the - // final value of the low 16 bits of the - // relocation is negative, add one. - static inline void - rel16_ha(unsigned char* view, - const Sized_relobj* object, - const Symbol_value* psymval, - typename elfcpp::Elf_types::Elf_Addr addend, - typename elfcpp::Elf_types::Elf_Addr address) + // First word of GOT header needs some values that are not + // handled by Output_data_got so poke them in here. + // For 32-bit, address of .dynamic, for 64-bit, address of TOCbase. + void + do_write(Output_file* of) + { + Valtype val = 0; + if (size == 32 && this->layout_->dynamic_data() != NULL) + val = this->layout_->dynamic_section()->address(); + if (size == 64) + val = this->output_section()->address() + 0x8000; + this->replace_constant(this->header_index_, val); + Output_data_got::do_write(of); + } + +private: + void + reserve_ent(unsigned int cnt = 1) { - typename elfcpp::Elf_types::Elf_Addr reloc; + if (this->header_ent_cnt_ == 0) + return; + if (this->num_entries() + cnt > this->header_index_) + this->make_header(); + } - reloc = (psymval->value(object, addend) - address); - if (reloc & 0x8000) - reloc += 0x10000; - reloc >>= 16; + void + make_header() + { + this->header_ent_cnt_ = 0; + this->header_index_ = this->num_entries(); + if (size == 32) + { + Output_data_got::add_constant(0); + Output_data_got::add_constant(0); + Output_data_got::add_constant(0); - elfcpp::Swap<16, big_endian>::writeval(view, reloc); + // Define _GLOBAL_OFFSET_TABLE_ at the header + Symbol *gotsym = this->symtab_->lookup("_GLOBAL_OFFSET_TABLE_", NULL); + if (gotsym != NULL) + { + Sized_symbol* sym = static_cast*>(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::add_constant(0); } + + // Stashed pointers. + Symbol_table* symtab_; + Layout* layout_; + + // GOT header size. + unsigned int header_ent_cnt_; + // GOT header index. + unsigned int header_index_; }; // Get the GOT section, creating it if necessary. template -Output_data_got* +Output_data_got_powerpc* Target_powerpc::got_section(Symbol_table* symtab, Layout* layout) { @@ -712,37 +1865,12 @@ Target_powerpc::got_section(Symbol_table* symtab, { gold_assert(symtab != NULL && layout != NULL); - this->got_ = new Output_data_got(); + this->got_ + = new Output_data_got_powerpc(symtab, layout); layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, - this->got_, false); - - // Create the GOT2 or TOC in the .got section. - if (size == 32) - { - this->got2_ = new Output_data_space(4, "** GOT2"); - layout->add_output_section_data(".got2", elfcpp::SHT_PROGBITS, - elfcpp::SHF_ALLOC - | elfcpp::SHF_WRITE, - this->got2_, false); - } - else - { - this->toc_ = new Output_data_space(8, "** TOC"); - layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS, - elfcpp::SHF_ALLOC - | elfcpp::SHF_WRITE, - this->toc_, false); - } - - // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section. - symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, - this->got_, - 0, 0, elfcpp::STT_OBJECT, - elfcpp::STB_LOCAL, - elfcpp::STV_HIDDEN, 0, - false, false); + this->got_, ORDER_DATA, false); } return this->got_; @@ -759,174 +1887,2386 @@ Target_powerpc::rela_dyn_section(Layout* layout) 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_, true); + elfcpp::SHF_ALLOC, this->rela_dyn_, + ORDER_DYNAMIC_RELOCS, false); } return this->rela_dyn_; } -// A class to handle the PLT data. - -template -class Output_data_plt_powerpc : public Output_section_data +class Stub_control { public: - typedef Output_data_reloc Reloc_section; - - Output_data_plt_powerpc(Layout*); + // 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)), + 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; + } + } - // Add an entry to the PLT. - void add_entry(Symbol* gsym); + // 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); - // Return the .rela.plt section data. - const Reloc_section* rel_plt() const - { - return this->rel_; - } + const Output_section::Input_section* + owner() + { return owner_; } - protected: - void do_adjust_output_section(Output_section* os); + Output_section* + output_section() + { return output_section_; } private: - // The size of an entry in the PLT. - static const int base_plt_entry_size = (size == 32 ? 16 : 24); - - // Set the final size. - void - set_final_data_size() + typedef enum { - unsigned int full_count = this->count_ + 4; - - this->set_data_size(full_count * base_plt_entry_size); - } - - // Write out the PLT data. - void - do_write(Output_file*); - - // The reloc section. - Reloc_section* rel_; - // The number of PLT entries. - unsigned int count_; + 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_; }; -// Create the PLT section. The ordinary .got section is an argument, -// since we need to refer to the start. +// Return true iff input section can be handled by current stub/ +// group. -template -Output_data_plt_powerpc::Output_data_plt_powerpc(Layout* layout) - : Output_section_data(size == 32 ? 4 : 8), count_(0) +bool +Stub_control::can_add_to_stub_group(Output_section* o, + const Output_section::Input_section* i, + bool has14) { - this->rel_ = new Reloc_section(false); - layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, - elfcpp::SHF_ALLOC, this->rel_, true); -} - -template + 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->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 +void +Target_powerpc::group_sections(Layout* layout, + const Task*) +{ + Stub_control stub_control(parameters->options().stub_group_size()); + + // Group input sections and insert stub table + Stub_table* 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* ppcobj = static_cast + *>(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_table = NULL; + } + if (stub_table == NULL) + stub_table = this->new_stub_table(); + ppcobj->set_stub_table(i->shndx(), stub_table); + } + } + } + if (stub_table != NULL) + stub_table->init(stub_control.owner(), stub_control.output_section()); +} + +// If this branch needs a plt call stub, or a long branch stub, make one. + +template +void +Target_powerpc::Branch_info::make_stub( + Stub_table* stub_table, + Stub_table* 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* gsym = static_cast*>(sym); + if (gsym != NULL + ? use_plt_offset(gsym, Scan::get_reference_flags(this->r_type_)) + : this->object_->local_has_plt_offset(this->r_sym_)) + { + 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 + { + unsigned int 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(gsym, &status); + if (status != Symbol_table::CFVS_OK) + return; + } + else + { + const Symbol_value* psymval + = this->object_->local_symbol(this->r_sym_); + Symbol_value symval; + typedef Sized_relobj_file 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); + } + to += this->addend_; + if (stub_table == NULL) + stub_table = this->object_->stub_table(this->shndx_); + gold_assert(stub_table != NULL); + if (size == 64 && is_branch_reloc(this->r_type_)) + { + unsigned int dest_shndx; + to = stub_table->targ()->symval_for_branch(to, gsym, this->object_, + &dest_shndx); + } + Address delta = to - from; + if (delta + max_branch_offset >= 2 * max_branch_offset) + { + stub_table->add_long_branch_entry(this->object_, to); + } + } +} + +// Relaxation hook. This is where we do stub generation. + +template +bool +Target_powerpc::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 = parameters->options().plt_thread_safe(); + if (size == 64 && !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_start", + "GOMP_parallel_loop_static_start", + "GOMP_parallel_loop_dynamic_start", + "GOMP_parallel_loop_guided_start", + "GOMP_parallel_loop_runtime_start", + "GOMP_parallel_sections_start", + }; + + 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* object + = static_cast*>((*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* ifunc_stub_table + = this->stub_tables_.size() == 0 ? NULL : this->stub_tables_[0]; + Stub_table* 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_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* stub_table + = static_cast*>( + i->relaxed_input_section()); + off += stub_table->set_address_and_size(os, off); + } + else + off += i->data_size(); + } + // If .brlt 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_data_size(); + 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_data_size(); + } + return again; +} + +template +void +Target_powerpc::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 (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] == 0) + len -= resolve_size; + else + { + address += len - resolve_size; + len = resolve_size; + } + } + } + else + { + // Must be a stub table. + const Stub_table* stub_table + = static_cast*>(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 +class Output_data_plt_powerpc : public Output_section_data_build +{ + public: + typedef Output_data_reloc Reloc_section; + + Output_data_plt_powerpc(Target_powerpc* targ, + Reloc_section* plt_rel, + unsigned int reserved_size, + const char* name) + : Output_section_data_build(size == 32 ? 4 : 8), + rel_(plt_rel), + targ_(targ), + initial_plt_entry_size_(reserved_size), + name_(name) + { } + + // Add an entry to the PLT. + void + add_entry(Symbol*); + + void + add_ifunc_entry(Symbol*); + + void + add_local_ifunc_entry(Sized_relobj_file*, unsigned int); + + // Return the .rela.plt section data. + Reloc_section* + rel_plt() const + { + return this->rel_; + } + + // Return the number of PLT entries. + unsigned int + entry_count() const + { + return ((this->current_data_size() - this->initial_plt_entry_size_) + / plt_entry_size); + } + + // Return the offset of the first non-reserved PLT entry. + unsigned int + first_plt_entry_offset() + { return this->initial_plt_entry_size_; } + + // Return the size of a PLT entry. + static unsigned int + get_plt_entry_size() + { return plt_entry_size; } + + protected: + void + do_adjust_output_section(Output_section* os) + { + os->set_entsize(0); + } + + // Write to a map file. + void + do_print_to_mapfile(Mapfile* mapfile) const + { mapfile->print_output_data(this, this->name_); } + + private: + // The size of an entry in the PLT. + static const int plt_entry_size = size == 32 ? 4 : 24; + + // Write out the PLT data. + void + do_write(Output_file*); + + // The reloc section. + Reloc_section* rel_; + // Allows access to .glink for do_write. + Target_powerpc* targ_; + // The size of the first reserved entry. + int initial_plt_entry_size_; + // What to report in map file. + const char *name_; +}; + +// Add an entry to the PLT. + +template +void +Output_data_plt_powerpc::add_entry(Symbol* gsym) +{ + if (!gsym->has_plt_offset()) + { + 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 += plt_entry_size; + this->set_current_data_size(off); + } +} + +// Add an entry for a global ifunc symbol that resolves locally, to the IPLT. + +template +void +Output_data_plt_powerpc::add_ifunc_entry(Symbol* gsym) +{ + if (!gsym->has_plt_offset()) + { + section_size_type off = this->current_data_size(); + gsym->set_plt_offset(off); + unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; + if (size == 64) + dynrel = elfcpp::R_PPC64_JMP_IREL; + this->rel_->add_symbolless_global_addend(gsym, dynrel, this, off, 0); + off += plt_entry_size; + this->set_current_data_size(off); + } +} + +// Add an entry for a local ifunc symbol to the IPLT. + +template +void +Output_data_plt_powerpc::add_local_ifunc_entry( + Sized_relobj_file* relobj, + unsigned int local_sym_index) +{ + if (!relobj->local_has_plt_offset(local_sym_index)) + { + 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) + dynrel = elfcpp::R_PPC64_JMP_IREL; + this->rel_->add_symbolless_local_addend(relobj, local_sym_index, dynrel, + this, off, 0); + off += plt_entry_size; + this->set_current_data_size(off); + } +} + +static const uint32_t add_0_11_11 = 0x7c0b5a14; +static const uint32_t add_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_12_2_11 = 0x7d825a14; +static const uint32_t add_12_12_11 = 0x7d8c5a14; +static const uint32_t addi_11_11 = 0x396b0000; +static const uint32_t addi_12_12 = 0x398c0000; +static const uint32_t addi_2_2 = 0x38420000; +static const uint32_t addi_3_2 = 0x38620000; +static const uint32_t addi_3_3 = 0x38630000; +static const uint32_t addis_0_2 = 0x3c020000; +static const uint32_t addis_0_13 = 0x3c0d0000; +static const uint32_t addis_11_11 = 0x3d6b0000; +static const uint32_t addis_11_30 = 0x3d7e0000; +static const uint32_t addis_12_12 = 0x3d8c0000; +static const uint32_t addis_12_2 = 0x3d820000; +static const uint32_t addis_3_2 = 0x3c620000; +static const uint32_t addis_3_13 = 0x3c6d0000; +static const uint32_t b = 0x48000000; +static const uint32_t bcl_20_31 = 0x429f0005; +static const uint32_t bctr = 0x4e800420; +static const uint32_t blr = 0x4e800020; +static const uint32_t blrl = 0x4e800021; +static const uint32_t 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_11_12 = 0xe96c0000; +static const uint32_t ld_11_2 = 0xe9620000; +static const uint32_t ld_2_1 = 0xe8410000; +static const uint32_t ld_2_11 = 0xe84b0000; +static const uint32_t ld_2_12 = 0xe84c0000; +static const uint32_t ld_2_2 = 0xe8420000; +static const uint32_t lfd_0_1 = 0xc8010000; +static const uint32_t li_0_0 = 0x38000000; +static const uint32_t li_12_0 = 0x39800000; +static const uint32_t lis_0_0 = 0x3c000000; +static const uint32_t lis_11 = 0x3d600000; +static const uint32_t lis_12 = 0x3d800000; +static const uint32_t lwz_0_12 = 0x800c0000; +static const uint32_t lwz_11_11 = 0x816b0000; +static const uint32_t lwz_11_30 = 0x817e0000; +static const uint32_t lwz_12_12 = 0x818c0000; +static const uint32_t lwzu_0_12 = 0x840c0000; +static const uint32_t lvx_0_12_0 = 0x7c0c00ce; +static const uint32_t mflr_0 = 0x7c0802a6; +static const uint32_t mflr_11 = 0x7d6802a6; +static const uint32_t mflr_12 = 0x7d8802a6; +static const uint32_t mtctr_0 = 0x7c0903a6; +static const uint32_t mtctr_11 = 0x7d6903a6; +static const uint32_t 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 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 xor_11_11_11 = 0x7d6b5a78; + +// Write out the PLT. + +template +void +Output_data_plt_powerpc::do_write(Output_file* of) +{ + if (size == 32) + { + 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* 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 +void +Target_powerpc::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 it's range. + this->rela_dyn_section(layout); + + Reloc_section* plt_rel = new Reloc_section(false); + layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, + elfcpp::SHF_ALLOC, plt_rel, + ORDER_DYNAMIC_PLT_RELOCS, false); + this->plt_ + = new Output_data_plt_powerpc(this, plt_rel, + size == 32 ? 0 : 24, + "** PLT"); + layout->add_output_section_data(".plt", + (size == 32 + ? elfcpp::SHT_PROGBITS + : elfcpp::SHT_NOBITS), + elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, + this->plt_, + (size == 32 + ? ORDER_SMALL_DATA + : ORDER_SMALL_BSS), + false); + } +} + +// Create the IPLT section. + +template +void +Target_powerpc::make_iplt_section(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(this, iplt_rel, + 0, "** IPLT"); + this->plt_->output_section()->add_output_section_data(this->iplt_); + } +} + +// A section for huge long branch addresses, similar to plt section. + +template +class Output_data_brlt_powerpc : public Output_section_data_build +{ + public: + typedef typename elfcpp::Elf_types::Elf_Addr Address; + typedef Output_data_reloc Reloc_section; + + Output_data_brlt_powerpc(Target_powerpc* targ, + Reloc_section* brlt_rel) + : Output_section_data_build(size == 32 ? 4 : 8), + rel_(brlt_rel), + targ_(targ) + { } + + // 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::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* targ_; +}; + +// Make the branch lookup table section. + +template +void +Target_powerpc::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 .brlt (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(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(".brlt", + (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 .brlt when non-PIC. + +template +void +Output_data_brlt_powerpc::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 +struct Eh_cie +{ + static const unsigned char eh_frame_cie[12]; +}; + +template +const unsigned char Eh_cie::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. +static const unsigned char glink_eh_frame_fde_64[] = +{ + 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, 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 +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 +class Stub_table : public Output_relaxed_input_section +{ + public: + typedef typename elfcpp::Elf_types::Elf_Addr Address; + static const Address invalid_address = static_cast
(0) - 1; + + Stub_table(Target_powerpc* 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*, + const Symbol*, + unsigned int, + Address); + + void + add_plt_call_entry(const Sized_relobj_file*, + 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*, + unsigned int) const; + + Address + find_plt_call_entry(const Sized_relobj_file*, + const Symbol*, + unsigned int, + Address) const; + + Address + find_plt_call_entry(const Sized_relobj_file*, + unsigned int, + unsigned int, + Address) const; + + // Add a long branch stub. + void + add_long_branch_entry(const Powerpc_relobj*, Address); + + Address + find_long_branch_entry(const Powerpc_relobj*, + 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::eh_frame_cie, + sizeof (Eh_cie::eh_frame_cie), + default_fde, + sizeof (default_fde)); + this->eh_frame_added_ = true; + } + } + + Target_powerpc* + targ() const + { return targ_; } + + private: + class Plt_stub_ent; + class Plt_stub_ent_hash; + typedef Unordered_map 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* 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* ppcobj = static_cast + *>(p->first.object_); + got_addr += ppcobj->toc_base_offset(); + Address off = plt_addr - got_addr; + bool static_chain = parameters->options().plt_static_chain(); + bool thread_safe = this->targ_->plt_thread_safe(); + unsigned int bytes = (4 * 5 + + 4 * static_chain + + 8 * thread_safe + + 4 * (ha(off) != 0) + + 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* object, + unsigned int locsym_index) + : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) + { } + + Plt_stub_ent(const Sized_relobj_file* 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* 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* object_; + typename elfcpp::Elf_types::Elf_Addr addend_; + unsigned int locsym_; + }; + + class Plt_stub_ent_hash + { + public: + size_t operator()(const Plt_stub_ent& ent) const + { + return (reinterpret_cast(ent.sym_) + ^ reinterpret_cast(ent.object_) + ^ ent.addend_ + ^ ent.locsym_); + } + }; + + // Long branch stub keys. + class Branch_stub_ent + { + public: + Branch_stub_ent(const Powerpc_relobj* 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* 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_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 +Stub_table* +Target_powerpc::new_stub_table() +{ + Stub_table* stub_table + = new Stub_table(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 +void +Stub_table::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 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 +void +Stub_table::add_plt_call_entry( + const Sized_relobj_file* object, + const Symbol* gsym, + unsigned int r_type, + Address addend) +{ + Plt_stub_ent ent(object, gsym, r_type, addend); + Address off = this->plt_size_; + std::pair 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 +void +Stub_table::add_plt_call_entry( + const Sized_relobj_file* object, + unsigned int locsym_index, + unsigned int r_type, + Address addend) +{ + Plt_stub_ent ent(object, locsym_index, r_type, addend); + Address off = this->plt_size_; + std::pair 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 +typename Stub_table::Address +Stub_table::find_plt_call_entry( + const Sized_relobj_file* 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 +typename Stub_table::Address +Stub_table::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 +typename Stub_table::Address +Stub_table::find_plt_call_entry( + const Sized_relobj_file* 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 +typename Stub_table::Address +Stub_table::find_plt_call_entry( + const Sized_relobj_file* 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 +void +Stub_table::add_long_branch_entry( + const Powerpc_relobj* 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 +typename Stub_table::Address +Stub_table::find_long_branch_entry( + const Powerpc_relobj* 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 +class Output_data_glink : public Output_section_data +{ + public: + static const int pltresolve_size = 16*4; + + Output_data_glink(Target_powerpc* targ) + : Output_section_data(16), targ_(targ) + { } + + void + add_eh_frame(Layout* layout) + { + if (!parameters->options().ld_generated_unwind_info()) + return; + + if (size == 64) + layout->add_eh_frame_for_plt(this, + Eh_cie<64>::eh_frame_cie, + sizeof (Eh_cie<64>::eh_frame_cie), + glink_eh_frame_fde_64, + sizeof (glink_eh_frame_fde_64)); + 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)); + } + } + + 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* targ_; +}; + +template void -Output_data_plt_powerpc::do_adjust_output_section(Output_section* os) +Output_data_glink::set_final_data_size() { - os->set_entsize(0); + 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 += 8 * count; + if (count > 0x8000) + total += 4 * (count - 0x8000); + } + } + + this->set_data_size(total); } -// Add an entry to the PLT. +// Write out plt and long branch stub code. template void -Output_data_plt_powerpc::add_entry(Symbol* gsym) +Stub_table::do_write(Output_file* of) { - gold_assert(!gsym->has_plt_offset()); - unsigned int index = this->count_+ + 4; - section_offset_type plt_offset; + 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* 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* ppcobj = static_cast + *>(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 static_chain = parameters->options().plt_static_chain(); + bool thread_safe = 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(p, std_2_1 + 40), p += 4; + write_insn(p, addis_12_2 + ha(off)), p += 4; + write_insn(p, ld_11_12 + l(off)), p += 4; + if (ha(off + 8 + 8 * static_chain) != ha(off)) + { + write_insn(p, addi_12_12 + l(off)), p += 4; + off = 0; + } + write_insn(p, mtctr_11), p += 4; + if (use_fake_dep) + { + write_insn(p, xor_11_11_11), p += 4; + write_insn(p, add_12_12_11), p += 4; + } + write_insn(p, ld_2_12 + l(off + 8)), p += 4; + if (static_chain) + write_insn(p, ld_11_12 + l(off + 16)), p += 4; + } + else + { + write_insn(p, std_2_1 + 40), p += 4; + write_insn(p, ld_11_2 + l(off)), p += 4; + if (ha(off + 8 + 8 * static_chain) != ha(off)) + { + write_insn(p, addi_2_2 + l(off)), p += 4; + off = 0; + } + write_insn(p, mtctr_11), p += 4; + if (use_fake_dep) + { + write_insn(p, xor_11_11_11), p += 4; + write_insn(p, add_2_2_11), p += 4; + } + if (static_chain) + write_insn(p, ld_11_2 + l(off + 16)), p += 4; + write_insn(p, ld_2_2 + l(off + 8)), p += 4; + } + if (thread_safe && !use_fake_dep) + { + write_insn(p, cmpldi_2_0), p += 4; + write_insn(p, bnectr_p4), p += 4; + write_insn(p, b | (cmp_branch_off & 0x3fffffc)); + } + else + write_insn(p, bctr); + } + } - if (index < 8192) - plt_offset = index * base_plt_entry_size; + // 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(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(p, ld_11_2 + l(brltoff)), p += 4; + } + else + { + write_insn(p, addis_12_2 + ha(brltoff)), p += 4; + write_insn(p, ld_11_12 + l(brltoff)), p += 4; + } + write_insn(p, mtctr_11), p += 4; + write_insn(p, bctr); + } + } + } else - gold_unreachable(); - - gsym->set_plt_offset(plt_offset); - - ++this->count_; - - gsym->set_needs_dynsym_entry(); - this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this, - plt_offset, 0); -} - -static const unsigned int addis_11_11 = 0x3d6b0000; -static const unsigned int addis_11_30 = 0x3d7e0000; -static const unsigned int addis_12_12 = 0x3d8c0000; -static const unsigned int addi_11_11 = 0x396b0000; -static const unsigned int add_0_11_11 = 0x7c0b5a14; -static const unsigned int add_11_0_11 = 0x7d605a14; -static const unsigned int b = 0x48000000; -static const unsigned int bcl_20_31 = 0x429f0005; -static const unsigned int bctr = 0x4e800420; -static const unsigned int lis_11 = 0x3d600000; -static const unsigned int lis_12 = 0x3d800000; -static const unsigned int lwzu_0_12 = 0x840c0000; -static const unsigned int lwz_0_12 = 0x800c0000; -static const unsigned int lwz_11_11 = 0x816b0000; -static const unsigned int lwz_11_30 = 0x817e0000; -static const unsigned int lwz_12_12 = 0x818c0000; -static const unsigned int mflr_0 = 0x7c0802a6; -static const unsigned int mflr_12 = 0x7d8802a6; -static const unsigned int mtctr_0 = 0x7c0903a6; -static const unsigned int mtctr_11 = 0x7d6903a6; -static const unsigned int mtlr_0 = 0x7c0803a6; -static const unsigned int nop = 0x60000000; -static const unsigned int sub_11_11_12 = 0x7d6c5850; - -static const unsigned int addis_r12_r2 = 0x3d820000; /* addis %r12,%r2,xxx@ha */ -static const unsigned int std_r2_40r1 = 0xf8410028; /* std %r2,40(%r1) */ -static const unsigned int ld_r11_0r12 = 0xe96c0000; /* ld %r11,xxx+0@l(%r12) */ -static const unsigned int ld_r2_0r12 = 0xe84c0000; /* ld %r2,xxx+8@l(%r12) */ - /* ld %r11,xxx+16@l(%r12) */ + { + 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* ppcobj + = (static_cast*> + (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* 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(p + 0, lwz_11_30 + l(off)); + write_insn(p + 4, mtctr_11); + write_insn(p + 8, bctr); + } + else + { + write_insn(p + 0, addis_11_30 + ha(off)); + write_insn(p + 4, lwz_11_11 + l(off)); + write_insn(p + 8, mtctr_11); + write_insn(p + 12, bctr); + } + } + else + { + write_insn(p + 0, lis_11 + ha(plt_addr)); + write_insn(p + 4, lwz_11_11 + l(plt_addr)); + write_insn(p + 8, mtctr_11); + write_insn(p + 12, bctr); + } + } + } + // Write out 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(p, b | (delta & 0x3fffffc)); + else if (!parameters->options().output_is_position_independent()) + { + write_insn(p + 0, lis_12 + ha(bs->first.dest_)); + write_insn(p + 4, addi_12_12 + l(bs->first.dest_)); + write_insn(p + 8, mtctr_12); + write_insn(p + 12, bctr); + } + else + { + delta -= 8; + write_insn(p + 0, mflr_0); + write_insn(p + 4, bcl_20_31); + write_insn(p + 8, mflr_12); + write_insn(p + 12, addis_12_12 + ha(delta)); + write_insn(p + 16, addi_12_12 + l(delta)); + write_insn(p + 20, mtlr_0); + write_insn(p + 24, mtctr_12); + write_insn(p + 28, bctr); + } + } + } +} -// Write out the PLT. +// Write out .glink. template void -Output_data_plt_powerpc::do_write(Output_file* of) +Output_data_glink::do_write(Output_file* of) { - const off_t off = this->offset(); + 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* pov = oview; + unsigned char* p; - memset(pov, 0, base_plt_entry_size * 4); - pov += base_plt_entry_size * 4; - - unsigned int plt_offset = base_plt_entry_size * 4; - const unsigned int count = this->count_; + // The base address of the .plt section. + typedef typename elfcpp::Elf_types::Elf_Addr Address; + Address plt_base = this->targ_->plt_section()->address(); if (size == 64) { - for (unsigned int i = 0; i < count; i++) + // 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; + + write_insn(p, mflr_12), p += 4; + write_insn(p, bcl_20_31), p += 4; + write_insn(p, mflr_11), p += 4; + write_insn(p, ld_2_11 + l(-16)), p += 4; + write_insn(p, mtlr_12), p += 4; + write_insn(p, add_12_2_11), p += 4; + write_insn(p, ld_11_12 + 0), p += 4; + write_insn(p, ld_2_12 + 8), p += 4; + write_insn(p, mtctr_11), p += 4; + write_insn(p, ld_11_12 + 16), p += 4; + write_insn(p, bctr), p += 4; + while (p < oview + this->pltresolve_size) + write_insn(p, nop), p += 4; + + // Write lazy link call stubs. + uint32_t indx = 0; + while (p < oview + oview_size) { + if (indx < 0x8000) + { + write_insn(p, li_0_0 + indx), p += 4; + } + else + { + write_insn(p, lis_0_0 + hi(indx)), p += 4; + write_insn(p, ori_0_0_0 + l(indx)), p += 4; + } + uint32_t branch_off = 8 - (p - oview); + write_insn(p, b + (branch_off & 0x3fffffc)), p += 4; + indx++; } } else { - for (unsigned int i = 0; i < count; i++) + const Output_data_got_powerpc* 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(p, b + end_p - p), p += 4; + while (p < end_p) + write_insn(p, nop), p += 4; + + // Write out pltresolve call stub. + if (parameters->options().output_is_position_independent()) + { + Address res0_off = 0; + Address after_bcl_off = the_end + 12; + Address bcl_res0 = after_bcl_off - res0_off; + + write_insn(p + 0, addis_11_11 + ha(bcl_res0)); + write_insn(p + 4, mflr_0); + write_insn(p + 8, bcl_20_31); + write_insn(p + 12, addi_11_11 + l(bcl_res0)); + write_insn(p + 16, mflr_12); + write_insn(p + 20, mtlr_0); + write_insn(p + 24, sub_11_11_12); + + Address got_bcl = g_o_t + 4 - (after_bcl_off + this->address()); + + write_insn(p + 28, addis_12_12 + ha(got_bcl)); + if (ha(got_bcl) == ha(got_bcl + 4)) + { + write_insn(p + 32, lwz_0_12 + l(got_bcl)); + write_insn(p + 36, lwz_12_12 + l(got_bcl + 4)); + } + else + { + write_insn(p + 32, lwzu_0_12 + l(got_bcl)); + write_insn(p + 36, lwz_12_12 + 4); + } + write_insn(p + 40, mtctr_0); + write_insn(p + 44, add_0_11_11); + write_insn(p + 48, add_11_0_11); + write_insn(p + 52, bctr); + write_insn(p + 56, nop); + write_insn(p + 60, nop); + } + else + { + Address res0 = this->address(); + + write_insn(p + 0, lis_12 + ha(g_o_t + 4)); + write_insn(p + 4, addis_11_11 + ha(-res0)); + if (ha(g_o_t + 4) == ha(g_o_t + 8)) + write_insn(p + 8, lwz_0_12 + l(g_o_t + 4)); + else + write_insn(p + 8, lwzu_0_12 + l(g_o_t + 4)); + write_insn(p + 12, addi_11_11 + l(-res0)); + write_insn(p + 16, mtctr_0); + write_insn(p + 20, add_0_11_11); + if (ha(g_o_t + 4) == ha(g_o_t + 8)) + write_insn(p + 24, lwz_12_12 + l(g_o_t + 8)); + else + write_insn(p + 24, lwz_12_12 + 4); + write_insn(p + 28, add_11_0_11); + write_insn(p + 32, bctr); + write_insn(p + 36, nop); + write_insn(p + 40, nop); + write_insn(p + 44, nop); + write_insn(p + 48, nop); + write_insn(p + 52, nop); + write_insn(p + 56, nop); + write_insn(p + 60, nop); + } + p += 64; + } + + of->write_output_view(off, oview_size, oview); +} + + +// A class to handle linker generated save/restore functions. + +template +class Output_data_save_res : public Output_section_data_build +{ + public: + Output_data_save_res(Symbol_table* symtab); + + protected: + // Write to a map file. + void + do_print_to_mapfile(Mapfile* mapfile) const + { mapfile->print_output_data(this, _("** save/restore")); } + + void + do_write(Output_file*); + + private: + // The maximum size of save/restore contents. + static const unsigned int savres_max = 218*4; + + void + savres_define(Symbol_table* symtab, + const char *name, + unsigned int lo, unsigned int hi, + unsigned char* write_ent(unsigned char*, int), + unsigned char* write_tail(unsigned char*, int)); + + unsigned char *contents_; +}; + +template +static unsigned char* +savegpr0(unsigned char* p, int r) +{ + uint32_t insn = std_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn(p, insn); + return p + 4; +} + +template +static unsigned char* +savegpr0_tail(unsigned char* p, int r) +{ + p = savegpr0(p, r); + uint32_t insn = std_0_1 + 16; + write_insn(p, insn); + p = p + 4; + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +restgpr0(unsigned char* p, int r) +{ + uint32_t insn = ld_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn(p, insn); + return p + 4; +} + +template +static unsigned char* +restgpr0_tail(unsigned char* p, int r) +{ + uint32_t insn = ld_0_1 + 16; + write_insn(p, insn); + p = p + 4; + p = restgpr0(p, r); + write_insn(p, mtlr_0); + p = p + 4; + if (r == 29) + { + p = restgpr0(p, 30); + p = restgpr0(p, 31); + } + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +savegpr1(unsigned char* p, int r) +{ + uint32_t insn = std_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn(p, insn); + return p + 4; +} + +template +static unsigned char* +savegpr1_tail(unsigned char* p, int r) +{ + p = savegpr1(p, r); + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +restgpr1(unsigned char* p, int r) +{ + uint32_t insn = ld_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn(p, insn); + return p + 4; +} + +template +static unsigned char* +restgpr1_tail(unsigned char* p, int r) +{ + p = restgpr1(p, r); + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +savefpr(unsigned char* p, int r) +{ + uint32_t insn = stfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn(p, insn); + return p + 4; +} + +template +static unsigned char* +savefpr0_tail(unsigned char* p, int r) +{ + p = savefpr(p, r); + write_insn(p, std_0_1 + 16); + p = p + 4; + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +restfpr(unsigned char* p, int r) +{ + uint32_t insn = lfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; + write_insn(p, insn); + return p + 4; +} + +template +static unsigned char* +restfpr0_tail(unsigned char* p, int r) +{ + write_insn(p, ld_0_1 + 16); + p = p + 4; + p = restfpr(p, r); + write_insn(p, mtlr_0); + p = p + 4; + if (r == 29) + { + p = restfpr(p, 30); + p = restfpr(p, 31); + } + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +savefpr1_tail(unsigned char* p, int r) +{ + p = savefpr(p, r); + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +restfpr1_tail(unsigned char* p, int r) +{ + p = restfpr(p, r); + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +savevr(unsigned char* p, int r) +{ + uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; + write_insn(p, insn); + p = p + 4; + insn = stvx_0_12_0 + (r << 21); + write_insn(p, insn); + return p + 4; +} + +template +static unsigned char* +savevr_tail(unsigned char* p, int r) +{ + p = savevr(p, r); + write_insn(p, blr); + return p + 4; +} + +template +static unsigned char* +restvr(unsigned char* p, int r) +{ + uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; + write_insn(p, insn); + p = p + 4; + insn = lvx_0_12_0 + (r << 21); + write_insn(p, insn); + return p + 4; +} + +template +static unsigned char* +restvr_tail(unsigned char* p, int r) +{ + p = restvr(p, r); + write_insn(p, blr); + return p + 4; +} + + +template +Output_data_save_res::Output_data_save_res( + Symbol_table* symtab) + : Output_section_data_build(4), + contents_(NULL) +{ + this->savres_define(symtab, + "_savegpr0_", 14, 31, + savegpr0, savegpr0_tail); + this->savres_define(symtab, + "_restgpr0_", 14, 29, + restgpr0, restgpr0_tail); + this->savres_define(symtab, + "_restgpr0_", 30, 31, + restgpr0, restgpr0_tail); + this->savres_define(symtab, + "_savegpr1_", 14, 31, + savegpr1, savegpr1_tail); + this->savres_define(symtab, + "_restgpr1_", 14, 31, + restgpr1, restgpr1_tail); + this->savres_define(symtab, + "_savefpr_", 14, 31, + savefpr, savefpr0_tail); + this->savres_define(symtab, + "_restfpr_", 14, 29, + restfpr, restfpr0_tail); + this->savres_define(symtab, + "_restfpr_", 30, 31, + restfpr, restfpr0_tail); + this->savres_define(symtab, + "._savef", 14, 31, + savefpr, savefpr1_tail); + this->savres_define(symtab, + "._restf", 14, 31, + restfpr, restfpr1_tail); + this->savres_define(symtab, + "_savevr_", 20, 31, + savevr, savevr_tail); + this->savres_define(symtab, + "_restvr_", 20, 31, + restvr, restvr_tail); +} + +template +void +Output_data_save_res::savres_define( + Symbol_table* symtab, + const char *name, + unsigned int lo, unsigned int hi, + unsigned char* write_ent(unsigned char*, int), + unsigned char* write_tail(unsigned char*, int)) +{ + size_t len = strlen(name); + bool writing = false; + char sym[16]; + + memcpy(sym, name, len); + sym[len + 2] = 0; + + for (unsigned int i = lo; i <= hi; i++) + { + sym[len + 0] = i / 10 + '0'; + sym[len + 1] = i % 10 + '0'; + Symbol* gsym = symtab->lookup(sym); + bool refd = gsym != NULL && gsym->is_undefined(); + writing = writing || refd; + if (writing) { - elfcpp::Swap<32, true>::writeval(pov + 0x00, - lwz_11_30 + plt_offset); - elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11); - elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr); - elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop); - pov += base_plt_entry_size; - plt_offset += base_plt_entry_size; + 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); } } +} - gold_assert(static_cast(pov - oview) == oview_size); +// Write out save/restore. +template +void +Output_data_save_res::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 +void +Target_powerpc::make_glink_section(Layout* layout) +{ + if (this->glink_ == NULL) + { + this->glink_ = new Output_data_glink(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 @@ -935,74 +4275,166 @@ Target_powerpc::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) { - if (gsym->has_plt_offset()) - return; + 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 +void +Target_powerpc::make_local_ifunc_plt_entry( + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file* 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 +unsigned int +Target_powerpc::plt_entry_count() const +{ if (this->plt_ == NULL) - { - // Create the GOT section first. - this->got_section(symtab, layout); + return 0; + unsigned int count = this->plt_->entry_count(); + if (this->iplt_ != NULL) + count += this->iplt_->entry_count(); + return count; +} - this->plt_ = new Output_data_plt_powerpc(layout); - layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, - (elfcpp::SHF_ALLOC - | elfcpp::SHF_EXECINSTR - | elfcpp::SHF_WRITE), - this->plt_, false); +// Return the offset of the first non-reserved PLT entry. - // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section. - symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL, - this->plt_, - 0, 0, elfcpp::STT_OBJECT, - elfcpp::STB_LOCAL, - elfcpp::STV_HIDDEN, 0, - false, false); - } +template +unsigned int +Target_powerpc::first_plt_entry_offset() const +{ + return this->plt_->first_plt_entry_offset(); +} - this->plt_->add_entry(gsym); +// Return the size of each PLT entry. + +template +unsigned int +Target_powerpc::plt_entry_size() const +{ + return Output_data_plt_powerpc::get_plt_entry_size(); } -// Create a GOT entry for the TLS module index. +// Create a GOT entry for local dynamic __tls_get_addr calls. template unsigned int -Target_powerpc::got_mod_index_entry(Symbol_table* symtab, - Layout* layout, - Sized_relobj* object) +Target_powerpc::tlsld_got_offset( + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file* object) { - if (this->got_mod_index_offset_ == -1U) + 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* got; - unsigned int got_offset; - - got = this->got_section(symtab, layout); - got_offset = got->add_constant(0); + Output_data_got_powerpc* got + = this->got_section(symtab, layout); + unsigned int got_offset = got->add_constant_pair(0, 0); rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got, got_offset, 0); - got->add_constant(0); - this->got_mod_index_offset_ = got_offset; + this->tlsld_got_offset_ = got_offset; } - return this->got_mod_index_offset_; + return this->tlsld_got_offset_; } -// Optimize the TLS relocation type based on what we know about the -// symbol. IS_FINAL is true if the final address of this symbol is -// known at link time. +// Get the Reference_flags for a particular relocation. -static tls::Tls_optimization -optimize_tls_reloc(bool /* is_final */, int r_type) +template +int +Target_powerpc::Scan::get_reference_flags(unsigned int r_type) { - // If we are generating a shared library, then we can't do anything - // in the linker. - if (parameters->options().shared()) - return tls::TLSOPT_NONE; switch (r_type) { - // XXX + case elfcpp::R_POWERPC_NONE: + case elfcpp::R_POWERPC_GNU_VTINHERIT: + case elfcpp::R_POWERPC_GNU_VTENTRY: + case elfcpp::R_PPC64_TOC: + // No symbol reference. + return 0; + + case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_PPC64_UADDR64: + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_UADDR32: + case elfcpp::R_POWERPC_ADDR16: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_POWERPC_ADDR16_LO: + case elfcpp::R_POWERPC_ADDR16_HI: + case elfcpp::R_POWERPC_ADDR16_HA: + return Symbol::ABSOLUTE_REF; + + case elfcpp::R_POWERPC_ADDR24: + case elfcpp::R_POWERPC_ADDR14: + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: + return Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF; + + case elfcpp::R_PPC64_REL64: + case elfcpp::R_POWERPC_REL32: + case elfcpp::R_PPC_LOCAL24PC: + case elfcpp::R_POWERPC_REL16: + case elfcpp::R_POWERPC_REL16_LO: + case elfcpp::R_POWERPC_REL16_HI: + case elfcpp::R_POWERPC_REL16_HA: + return Symbol::RELATIVE_REF; + + case elfcpp::R_POWERPC_REL24: + case elfcpp::R_PPC_PLTREL24: + case elfcpp::R_POWERPC_REL14: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; + + case elfcpp::R_POWERPC_GOT16: + case elfcpp::R_POWERPC_GOT16_LO: + case elfcpp::R_POWERPC_GOT16_HI: + case elfcpp::R_POWERPC_GOT16_HA: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_GOT16_LO_DS: + case elfcpp::R_PPC64_TOC16: + case elfcpp::R_PPC64_TOC16_LO: + case elfcpp::R_PPC64_TOC16_HI: + case elfcpp::R_PPC64_TOC16_HA: + case elfcpp::R_PPC64_TOC16_DS: + case elfcpp::R_PPC64_TOC16_LO_DS: + // Absolute in GOT. + return Symbol::ABSOLUTE_REF; + + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_TLS: + return Symbol::TLS_REF; + + case elfcpp::R_POWERPC_COPY: + case elfcpp::R_POWERPC_GLOB_DAT: + case elfcpp::R_POWERPC_JMP_SLOT: + case elfcpp::R_POWERPC_RELATIVE: + case elfcpp::R_POWERPC_DTPMOD: default: - gold_unreachable(); + // Not expected. We will give an error later. + return 0; } } @@ -1011,8 +4443,8 @@ optimize_tls_reloc(bool /* is_final */, int r_type) template void Target_powerpc::Scan::unsupported_reloc_local( - Sized_relobj* object, - unsigned int r_type) + Sized_relobj_file* object, + unsigned int r_type) { gold_error(_("%s: unsupported reloc %u against local symbol"), object->name().c_str(), r_type); @@ -1032,6 +4464,7 @@ Target_powerpc::Scan::check_non_pic(Relobj* object, // 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: @@ -1039,49 +4472,52 @@ Target_powerpc::Scan::check_non_pic(Relobj* object, 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_TPREL16_LO_DS: - case elfcpp::R_PPC64_TPREL16_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_HIGHER: - case elfcpp::R_PPC64_TPREL16_HIGHEST: - case elfcpp::R_PPC64_TPREL16_HIGHERA: - case elfcpp::R_PPC64_TPREL16_HIGHESTA: - case elfcpp::R_PPC64_ADDR16_LO_DS: - case elfcpp::R_POWERPC_ADDR16_LO: - case elfcpp::R_POWERPC_ADDR16_HI: - case elfcpp::R_POWERPC_ADDR16_HA: - case elfcpp::R_POWERPC_ADDR30: + 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_POWERPC_UADDR32: - case elfcpp::R_POWERPC_ADDR16: - case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_PPC64_JMP_IREL: case elfcpp::R_PPC64_ADDR16_DS: + case elfcpp::R_PPC64_ADDR16_LO_DS: case elfcpp::R_PPC64_ADDR16_HIGHER: case elfcpp::R_PPC64_ADDR16_HIGHEST: case elfcpp::R_PPC64_ADDR16_HIGHERA: case elfcpp::R_PPC64_ADDR16_HIGHESTA: - case elfcpp::R_POWERPC_ADDR14_BRTAKEN: - case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: - case elfcpp::R_POWERPC_REL32: case elfcpp::R_PPC64_REL64: + case elfcpp::R_POWERPC_ADDR30: + case elfcpp::R_PPC64_TPREL16_DS: + case elfcpp::R_PPC64_TPREL16_LO_DS: + case elfcpp::R_PPC64_TPREL16_HIGHER: + case elfcpp::R_PPC64_TPREL16_HIGHEST: + case elfcpp::R_PPC64_TPREL16_HIGHERA: + case elfcpp::R_PPC64_TPREL16_HIGHESTA: return; default: @@ -1093,6 +4529,12 @@ Target_powerpc::Scan::check_non_pic(Relobj* object, 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; @@ -1111,125 +4553,428 @@ Target_powerpc::Scan::check_non_pic(Relobj* object, return; } +// Return whether we need to make a PLT entry for a relocation of the +// given type against a STT_GNU_IFUNC symbol. + +template +bool +Target_powerpc::Scan::reloc_needs_plt_for_ifunc( + Sized_relobj_file* object, + unsigned int r_type) +{ + // In non-pic code any reference will resolve to the plt call stub + // for the ifunc symbol. + if (size == 32 && !parameters->options().output_is_position_independent()) + return true; + + switch (r_type) + { + // Word size refs from data sections are OK. + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_UADDR32: + if (size == 32) + return true; + break; + + case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_PPC64_UADDR64: + if (size == 64) + return true; + break; + + // GOT refs are good. + case elfcpp::R_POWERPC_GOT16: + case elfcpp::R_POWERPC_GOT16_LO: + case elfcpp::R_POWERPC_GOT16_HI: + case elfcpp::R_POWERPC_GOT16_HA: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_GOT16_LO_DS: + return true; + + // So are function calls. + case elfcpp::R_POWERPC_ADDR24: + case elfcpp::R_POWERPC_ADDR14: + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: + case elfcpp::R_POWERPC_REL24: + case elfcpp::R_PPC_PLTREL24: + case elfcpp::R_POWERPC_REL14: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + return true; + + default: + break; + } + + // Anything else is a problem. + // If we are building a static executable, the libc startup function + // responsible for applying indirect function relocations is going + // to complain about the reloc type. + // If we are building a dynamic executable, we will have a text + // relocation. The dynamic loader will set the text segment + // writable and non-executable to apply text relocations. So we'll + // segfault when trying to run the indirection function to resolve + // the reloc. + gold_error(_("%s: unsupported reloc %u for IFUNC symbol"), + object->name().c_str(), r_type); + return false; +} + // Scan a relocation for a local symbol. template inline void Target_powerpc::Scan::local( - Symbol_table* symtab, - Layout* layout, - Target_powerpc* target, - Sized_relobj* object, - unsigned int data_shndx, - Output_section* output_section, - const elfcpp::Rela& reloc, - unsigned int r_type, - const elfcpp::Sym& lsym) + Symbol_table* symtab, + Layout* layout, + Target_powerpc* target, + Sized_relobj_file* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela& reloc, + unsigned int r_type, + const elfcpp::Sym& lsym, + bool is_discarded) { + 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* ppc_object + = static_cast*>(object); + + if (is_discarded) + { + if (size == 64 + && data_shndx == ppc_object->opd_shndx() + && r_type == elfcpp::R_PPC64_ADDR64) + ppc_object->set_opd_discard(reloc.get_r_offset()); + return; + } + + // A local STT_GNU_IFUNC symbol may require a PLT entry. + bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; + if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) + { + unsigned int r_sym = elfcpp::elf_r_sym(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_PPC_EMB_MRKREF: + case elfcpp::R_POWERPC_TLS: + break; + + case elfcpp::R_PPC64_TOC: + { + Output_data_got_powerpc* got + = target->got_section(symtab, layout); + if (parameters->options().output_is_position_independent()) + { + Address off = reloc.get_r_offset(); + if (size == 64 + && data_shndx == ppc_object->opd_shndx() + && ppc_object->get_opd_discard(off - 8)) + break; + + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + Powerpc_relobj* symobj = ppc_object; + rela_dyn->add_output_section_relative(got->output_section(), + elfcpp::R_POWERPC_RELATIVE, + output_section, + object, data_shndx, off, + symobj->toc_base_offset()); + } + } break; case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_PPC64_UADDR64: case elfcpp::R_POWERPC_ADDR32: - case elfcpp::R_POWERPC_ADDR16_HA: + case elfcpp::R_POWERPC_UADDR32: + case elfcpp::R_POWERPC_ADDR24: + case elfcpp::R_POWERPC_ADDR16: case elfcpp::R_POWERPC_ADDR16_LO: + case elfcpp::R_POWERPC_ADDR16_HI: + case elfcpp::R_POWERPC_ADDR16_HA: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_PPC64_ADDR16_HIGHER: + case elfcpp::R_PPC64_ADDR16_HIGHERA: + case elfcpp::R_PPC64_ADDR16_HIGHEST: + case elfcpp::R_PPC64_ADDR16_HIGHESTA: + case elfcpp::R_PPC64_ADDR16_DS: + case elfcpp::R_PPC64_ADDR16_LO_DS: + case elfcpp::R_POWERPC_ADDR14: + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: // If building a shared library (or a position-independent // executable), we need to create a dynamic relocation for // this location. - if (parameters->options().output_is_position_independent()) - { - Reloc_section* rela_dyn = target->rela_dyn_section(layout); - - check_non_pic(object, r_type); - if (lsym.get_st_type() != elfcpp::STT_SECTION) - { - unsigned int r_sym = elfcpp::elf_r_sym(reloc.get_r_info()); - rela_dyn->add_local(object, r_sym, r_type, output_section, - data_shndx, reloc.get_r_offset(), - reloc.get_r_addend()); - } - else - { + if (parameters->options().output_is_position_independent() + || (size == 64 && is_ifunc)) + { + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + + if ((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32) + || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64)) + { unsigned int r_sym = elfcpp::elf_r_sym(reloc.get_r_info()); - gold_assert(lsym.get_st_value() == 0); - rela_dyn->add_local_relative(object, r_sym, r_type, + unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; + if (is_ifunc) + { + rela_dyn = target->iplt_section()->rel_plt(); + dynrel = elfcpp::R_POWERPC_IRELATIVE; + } + rela_dyn->add_local_relative(object, r_sym, dynrel, output_section, data_shndx, reloc.get_r_offset(), - reloc.get_r_addend()); - } - } + reloc.get_r_addend(), false); + } + else + { + check_non_pic(object, r_type); + unsigned int r_sym = elfcpp::elf_r_sym(reloc.get_r_info()); + rela_dyn->add_local(object, r_sym, r_type, output_section, + data_shndx, reloc.get_r_offset(), + reloc.get_r_addend()); + } + } break; case elfcpp::R_POWERPC_REL24: + case elfcpp::R_PPC_PLTREL24: case elfcpp::R_PPC_LOCAL24PC: + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, elfcpp::elf_r_sym(reloc.get_r_info()), + reloc.get_r_addend()); + break; + + case elfcpp::R_POWERPC_REL14: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, elfcpp::elf_r_sym(reloc.get_r_info()), + reloc.get_r_addend()); + break; + + case elfcpp::R_PPC64_REL64: case elfcpp::R_POWERPC_REL32: - case elfcpp::R_PPC_REL16_LO: - case elfcpp::R_PPC_REL16_HA: + 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_TPREL16: + case elfcpp::R_POWERPC_DTPREL16: + case elfcpp::R_POWERPC_SECTOFF_LO: + case elfcpp::R_POWERPC_TPREL16_LO: + case elfcpp::R_POWERPC_DTPREL16_LO: + case elfcpp::R_POWERPC_SECTOFF_HI: + case elfcpp::R_POWERPC_TPREL16_HI: + case elfcpp::R_POWERPC_DTPREL16_HI: + case elfcpp::R_POWERPC_SECTOFF_HA: + case elfcpp::R_POWERPC_TPREL16_HA: + case elfcpp::R_POWERPC_DTPREL16_HA: + case elfcpp::R_PPC64_DTPREL16_HIGHER: + case elfcpp::R_PPC64_TPREL16_HIGHER: + case elfcpp::R_PPC64_DTPREL16_HIGHERA: + case elfcpp::R_PPC64_TPREL16_HIGHERA: + case elfcpp::R_PPC64_DTPREL16_HIGHEST: + case elfcpp::R_PPC64_TPREL16_HIGHEST: + case elfcpp::R_PPC64_DTPREL16_HIGHESTA: + case elfcpp::R_PPC64_TPREL16_HIGHESTA: + case elfcpp::R_PPC64_TPREL16_DS: + case elfcpp::R_PPC64_TPREL16_LO_DS: + case elfcpp::R_PPC64_DTPREL16_DS: + case elfcpp::R_PPC64_DTPREL16_LO_DS: + case elfcpp::R_PPC64_SECTOFF_DS: + case elfcpp::R_PPC64_SECTOFF_LO_DS: + case elfcpp::R_PPC64_TLSGD: + case elfcpp::R_PPC64_TLSLD: break; case elfcpp::R_POWERPC_GOT16: case elfcpp::R_POWERPC_GOT16_LO: case elfcpp::R_POWERPC_GOT16_HI: case elfcpp::R_POWERPC_GOT16_HA: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_GOT16_LO_DS: + { + // The symbol requires a GOT entry. + Output_data_got_powerpc* got + = target->got_section(symtab, layout); + unsigned int r_sym = elfcpp::elf_r_sym(reloc.get_r_info()); + + if (!parameters->options().output_is_position_independent()) + { + if (size == 32 && is_ifunc) + got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); + else + got->add_local(object, r_sym, GOT_TYPE_STANDARD); + } + else if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)) + { + // If we are generating a shared object or a pie, this + // symbol's GOT entry will be set by a dynamic relocation. + unsigned int off; + off = got->add_constant(0); + object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off); + + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; + if (is_ifunc) + { + rela_dyn = target->iplt_section()->rel_plt(); + dynrel = elfcpp::R_POWERPC_IRELATIVE; + } + rela_dyn->add_local_relative(object, r_sym, dynrel, + got, off, 0, false); + } + } + break; + case elfcpp::R_PPC64_TOC16: case elfcpp::R_PPC64_TOC16_LO: case elfcpp::R_PPC64_TOC16_HI: case elfcpp::R_PPC64_TOC16_HA: case elfcpp::R_PPC64_TOC16_DS: case elfcpp::R_PPC64_TOC16_LO_DS: - { - // The symbol requires a GOT entry. - Output_data_got* got; - unsigned int r_sym; + // We need a GOT section. + target->got_section(symtab, layout); + break; - got = target->got_section(symtab, layout); - r_sym = elfcpp::elf_r_sym(reloc.get_r_info()); + case elfcpp::R_POWERPC_GOT_TLSGD16: + case elfcpp::R_POWERPC_GOT_TLSGD16_LO: + case elfcpp::R_POWERPC_GOT_TLSGD16_HI: + case elfcpp::R_POWERPC_GOT_TLSGD16_HA: + { + const tls::Tls_optimization tls_type = target->optimize_tls_gd(true); + if (tls_type == tls::TLSOPT_NONE) + { + Output_data_got_powerpc* got + = target->got_section(symtab, layout); + unsigned int r_sym = elfcpp::elf_r_sym(reloc.get_r_info()); + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + got->add_local_tls_pair(object, r_sym, GOT_TYPE_TLSGD, + rela_dyn, elfcpp::R_POWERPC_DTPMOD); + } + else if (tls_type == tls::TLSOPT_TO_LE) + { + // no GOT relocs needed for Local Exec. + } + else + gold_unreachable(); + } + break; - // If we are generating a shared object, we need to add a - // dynamic relocation for this symbol's GOT entry. - if (parameters->options().output_is_position_independent()) + 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) { - if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)) + // no GOT relocs needed for Local Exec. + if (parameters->options().emit_relocs()) { - Reloc_section* rela_dyn = target->rela_dyn_section(layout); - unsigned int off; - - off = got->add_constant(0); - object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off); - rela_dyn->add_local_relative(object, r_sym, - elfcpp::R_POWERPC_RELATIVE, - got, off, 0); + Output_section* os = layout->tls_segment()->first_section(); + gold_assert(os != NULL); + os->set_needs_symtab_index(); } - } + } else - got->add_local(object, r_sym, GOT_TYPE_STANDARD); + gold_unreachable(); } break; - case elfcpp::R_PPC64_TOC: - // We need a GOT section. - target->got_section(symtab, layout); + case elfcpp::R_POWERPC_GOT_DTPREL16: + case elfcpp::R_POWERPC_GOT_DTPREL16_LO: + case elfcpp::R_POWERPC_GOT_DTPREL16_HI: + case elfcpp::R_POWERPC_GOT_DTPREL16_HA: + { + Output_data_got_powerpc* got + = target->got_section(symtab, layout); + unsigned int r_sym = elfcpp::elf_r_sym(reloc.get_r_info()); + got->add_local_tls(object, r_sym, GOT_TYPE_DTPREL); + } break; - // These are relocations which should only be seen by the - // dynamic linker, and should never be seen here. - 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: - gold_error(_("%s: unexpected reloc %u in object file"), - object->name().c_str(), r_type); + 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(reloc.get_r_info()); + if (!object->local_has_got_offset(r_sym, GOT_TYPE_TPREL)) + { + Output_data_got_powerpc* 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. @@ -1237,9 +4982,9 @@ Target_powerpc::Scan::local( template void Target_powerpc::Scan::unsupported_reloc_global( - Sized_relobj* object, - unsigned int r_type, - Symbol* gsym) + Sized_relobj_file* object, + unsigned int r_type, + Symbol* gsym) { gold_error(_("%s: unsupported reloc %u against global symbol %s"), object->name().c_str(), r_type, gsym->demangled_name().c_str()); @@ -1250,192 +4995,456 @@ Target_powerpc::Scan::unsupported_reloc_global( template inline void Target_powerpc::Scan::global( - Symbol_table* symtab, - Layout* layout, - Target_powerpc* target, - Sized_relobj* object, - unsigned int data_shndx, - Output_section* output_section, - const elfcpp::Rela& reloc, - unsigned int r_type, - Symbol* gsym) + Symbol_table* symtab, + Layout* layout, + Target_powerpc* target, + Sized_relobj_file* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela& reloc, + unsigned int r_type, + Symbol* gsym) { + 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* ppc_object + = static_cast*>(object); + + // A STT_GNU_IFUNC symbol may require a PLT entry. + if (gsym->type() == elfcpp::STT_GNU_IFUNC + && this->reloc_needs_plt_for_ifunc(object, r_type)) + { + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, elfcpp::elf_r_sym(reloc.get_r_info()), + reloc.get_r_addend()); + target->make_plt_entry(symtab, layout, gsym); + } + switch (r_type) { case elfcpp::R_POWERPC_NONE: case elfcpp::R_POWERPC_GNU_VTINHERIT: case elfcpp::R_POWERPC_GNU_VTENTRY: + case elfcpp::R_PPC_LOCAL24PC: + case elfcpp::R_PPC_EMB_MRKREF: + case elfcpp::R_POWERPC_TLS: break; - case elfcpp::R_PPC_PLTREL24: - // If the symbol is fully resolved, this is just a PC32 reloc. - // Otherwise we need a PLT entry. - if (gsym->final_value_is_known()) - break; - // If building a shared library, we can also skip the PLT entry - // if the symbol is defined in the output file and is protected - // or hidden. - if (gsym->is_defined() - && !gsym->is_from_dynobj() - && !gsym->is_preemptible()) - break; - target->make_plt_entry(symtab, layout, gsym); + case elfcpp::R_PPC64_TOC: + { + Output_data_got_powerpc* got + = target->got_section(symtab, layout); + if (parameters->options().output_is_position_independent()) + { + Address off = reloc.get_r_offset(); + if (size == 64 + && data_shndx == ppc_object->opd_shndx() + && ppc_object->get_opd_discard(off - 8)) + break; + + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + Powerpc_relobj* symobj = ppc_object; + if (data_shndx != ppc_object->opd_shndx()) + symobj = static_cast + *>(gsym->object()); + rela_dyn->add_output_section_relative(got->output_section(), + elfcpp::R_POWERPC_RELATIVE, + output_section, + object, data_shndx, off, + symobj->toc_base_offset()); + } + } break; + case elfcpp::R_PPC64_ADDR64: + if (size == 64 + && data_shndx == ppc_object->opd_shndx() + && (gsym->is_defined_in_discarded_section() + || gsym->object() != object)) + { + ppc_object->set_opd_discard(reloc.get_r_offset()); + break; + } + // Fall thru + case elfcpp::R_PPC64_UADDR64: + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_UADDR32: + case elfcpp::R_POWERPC_ADDR24: case elfcpp::R_POWERPC_ADDR16: case elfcpp::R_POWERPC_ADDR16_LO: case elfcpp::R_POWERPC_ADDR16_HI: case elfcpp::R_POWERPC_ADDR16_HA: - case elfcpp::R_POWERPC_ADDR32: - case elfcpp::R_PPC64_ADDR64: - { - // Make a PLT entry if necessary. - if (gsym->needs_plt_entry()) - { - target->make_plt_entry(symtab, layout, gsym); - // Since this is not a PC-relative relocation, we may be - // taking the address of a function. In that case we need to - // set the entry in the dynamic symbol table to the address of - // the PLT entry. - if (gsym->is_from_dynobj() && !parameters->options().shared()) - gsym->set_needs_dynsym_value(); - } - // Make a dynamic relocation if necessary. - if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) - { - if (gsym->may_need_copy_reloc()) - { - target->copy_reloc(symtab, layout, object, - data_shndx, output_section, gsym, reloc); - } - else if ((r_type == elfcpp::R_POWERPC_ADDR32 - || r_type == elfcpp::R_PPC64_ADDR64) - && gsym->can_use_relative_reloc(false)) - { - Reloc_section* rela_dyn = target->rela_dyn_section(layout); - rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE, - output_section, object, - data_shndx, reloc.get_r_offset(), - reloc.get_r_addend()); - } - else - { - Reloc_section* rela_dyn = target->rela_dyn_section(layout); - - check_non_pic(object, r_type); - if (gsym->is_from_dynobj() - || gsym->is_undefined() - || gsym->is_preemptible()) - rela_dyn->add_global(gsym, r_type, output_section, - object, data_shndx, - reloc.get_r_offset(), - reloc.get_r_addend()); - else - rela_dyn->add_global_relative(gsym, r_type, - output_section, object, - data_shndx, - reloc.get_r_offset(), - reloc.get_r_addend()); - } - } - } - break; - - case elfcpp::R_POWERPC_REL24: - case elfcpp::R_PPC_LOCAL24PC: - case elfcpp::R_PPC_REL16: - case elfcpp::R_PPC_REL16_LO: - case elfcpp::R_PPC_REL16_HI: - case elfcpp::R_PPC_REL16_HA: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_PPC64_ADDR16_HIGHER: + case elfcpp::R_PPC64_ADDR16_HIGHERA: + case elfcpp::R_PPC64_ADDR16_HIGHEST: + case elfcpp::R_PPC64_ADDR16_HIGHESTA: + case elfcpp::R_PPC64_ADDR16_DS: + case elfcpp::R_PPC64_ADDR16_LO_DS: + case elfcpp::R_POWERPC_ADDR14: + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: { + // Make a PLT entry if necessary. if (gsym->needs_plt_entry()) - target->make_plt_entry(symtab, layout, gsym); + { + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, + elfcpp::elf_r_sym(reloc.get_r_info()), + reloc.get_r_addend()); + target->make_plt_entry(symtab, layout, gsym); + // Since this is not a PC-relative relocation, we may be + // taking the address of a function. In that case we need to + // set the entry in the dynamic symbol table to the address of + // the PLT call stub. + if (size == 32 + && gsym->is_from_dynobj() + && !parameters->options().output_is_position_independent()) + gsym->set_needs_dynsym_value(); + } // Make a dynamic relocation if necessary. - int flags = Symbol::NON_PIC_REF; - if (gsym->type() == elfcpp::STT_FUNC) - flags |= Symbol::FUNCTION_CALL; - if (gsym->needs_dynamic_reloc(flags)) + if (needs_dynamic_reloc(gsym, Scan::get_reference_flags(r_type)) + || (size == 64 && gsym->type() == elfcpp::STT_GNU_IFUNC)) { if (gsym->may_need_copy_reloc()) { target->copy_reloc(symtab, layout, object, - data_shndx, output_section, gsym, - reloc); + data_shndx, output_section, gsym, reloc); + } + else if ((size == 32 + && r_type == elfcpp::R_POWERPC_ADDR32 + && gsym->can_use_relative_reloc(false) + && !(gsym->visibility() == elfcpp::STV_PROTECTED + && parameters->options().shared())) + || (size == 64 + && r_type == elfcpp::R_PPC64_ADDR64 + && (gsym->can_use_relative_reloc(false) + || data_shndx == ppc_object->opd_shndx()))) + { + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; + if (gsym->type() == elfcpp::STT_GNU_IFUNC) + { + rela_dyn = target->iplt_section()->rel_plt(); + dynrel = elfcpp::R_POWERPC_IRELATIVE; + } + rela_dyn->add_symbolless_global_addend( + gsym, dynrel, output_section, object, data_shndx, + reloc.get_r_offset(), reloc.get_r_addend()); } else { Reloc_section* rela_dyn = target->rela_dyn_section(layout); check_non_pic(object, r_type); - rela_dyn->add_global(gsym, r_type, output_section, object, - data_shndx, reloc.get_r_offset(), + 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: + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, elfcpp::elf_r_sym(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 (needs_dynamic_reloc(gsym, Scan::get_reference_flags(r_type))) + { + if (gsym->may_need_copy_reloc()) + { + target->copy_reloc(symtab, layout, object, + data_shndx, output_section, gsym, + reloc); + } + else + { + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + check_non_pic(object, r_type); + rela_dyn->add_global(gsym, r_type, output_section, object, + data_shndx, reloc.get_r_offset(), + reloc.get_r_addend()); + } + } + break; + + case elfcpp::R_POWERPC_REL14: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), + r_type, elfcpp::elf_r_sym(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_TPREL16: + case elfcpp::R_POWERPC_DTPREL16: + case elfcpp::R_POWERPC_SECTOFF_LO: + case elfcpp::R_POWERPC_TPREL16_LO: + case elfcpp::R_POWERPC_DTPREL16_LO: + case elfcpp::R_POWERPC_SECTOFF_HI: + case elfcpp::R_POWERPC_TPREL16_HI: + case elfcpp::R_POWERPC_DTPREL16_HI: + case elfcpp::R_POWERPC_SECTOFF_HA: + case elfcpp::R_POWERPC_TPREL16_HA: + case elfcpp::R_POWERPC_DTPREL16_HA: + case elfcpp::R_PPC64_DTPREL16_HIGHER: + case elfcpp::R_PPC64_TPREL16_HIGHER: + case elfcpp::R_PPC64_DTPREL16_HIGHERA: + case elfcpp::R_PPC64_TPREL16_HIGHERA: + case elfcpp::R_PPC64_DTPREL16_HIGHEST: + case elfcpp::R_PPC64_TPREL16_HIGHEST: + case elfcpp::R_PPC64_DTPREL16_HIGHESTA: + case elfcpp::R_PPC64_TPREL16_HIGHESTA: + case elfcpp::R_PPC64_TPREL16_DS: + case elfcpp::R_PPC64_TPREL16_LO_DS: + case elfcpp::R_PPC64_DTPREL16_DS: + case elfcpp::R_PPC64_DTPREL16_LO_DS: + case elfcpp::R_PPC64_SECTOFF_DS: + case elfcpp::R_PPC64_SECTOFF_LO_DS: + case elfcpp::R_PPC64_TLSGD: + case elfcpp::R_PPC64_TLSLD: + break; + case elfcpp::R_POWERPC_GOT16: case elfcpp::R_POWERPC_GOT16_LO: case elfcpp::R_POWERPC_GOT16_HI: case elfcpp::R_POWERPC_GOT16_HA: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_GOT16_LO_DS: + { + // The symbol requires a GOT entry. + Output_data_got_powerpc* got; + + got = target->got_section(symtab, layout); + if (gsym->final_value_is_known()) + { + if (size == 32 && gsym->type() == elfcpp::STT_GNU_IFUNC) + got->add_global_plt(gsym, GOT_TYPE_STANDARD); + else + got->add_global(gsym, GOT_TYPE_STANDARD); + } + else if (!gsym->has_got_offset(GOT_TYPE_STANDARD)) + { + // If we are generating a shared object or a pie, this + // symbol's GOT entry will be set by a dynamic relocation. + unsigned int off = got->add_constant(0); + gsym->set_got_offset(GOT_TYPE_STANDARD, off); + + Reloc_section* rela_dyn = target->rela_dyn_section(layout); + if (gsym->can_use_relative_reloc(false) + && !(size == 32 + && gsym->visibility() == elfcpp::STV_PROTECTED + && parameters->options().shared())) + { + unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; + if (gsym->type() == elfcpp::STT_GNU_IFUNC) + { + rela_dyn = target->iplt_section()->rel_plt(); + dynrel = elfcpp::R_POWERPC_IRELATIVE; + } + rela_dyn->add_global_relative(gsym, dynrel, got, off, 0, false); + } + else + { + unsigned int dynrel = elfcpp::R_POWERPC_GLOB_DAT; + rela_dyn->add_global(gsym, dynrel, got, off, 0); + } + } + } + break; + case elfcpp::R_PPC64_TOC16: case elfcpp::R_PPC64_TOC16_LO: case elfcpp::R_PPC64_TOC16_HI: case elfcpp::R_PPC64_TOC16_HA: case elfcpp::R_PPC64_TOC16_DS: case elfcpp::R_PPC64_TOC16_LO_DS: - { - // The symbol requires a GOT entry. - Output_data_got* got; + // We need a GOT section. + target->got_section(symtab, layout); + break; - got = target->got_section(symtab, layout); - if (gsym->final_value_is_known()) - got->add_global(gsym, GOT_TYPE_STANDARD); - else - { - // If this symbol is not fully resolved, we need to add a - // dynamic relocation for it. - Reloc_section* rela_dyn = target->rela_dyn_section(layout); - if (gsym->is_from_dynobj() - || gsym->is_undefined() - || gsym->is_preemptible()) - got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, - elfcpp::R_POWERPC_GLOB_DAT); - else if (!gsym->has_got_offset(GOT_TYPE_STANDARD)) - { - unsigned int off = got->add_constant(0); + case elfcpp::R_POWERPC_GOT_TLSGD16: + case elfcpp::R_POWERPC_GOT_TLSGD16_LO: + case elfcpp::R_POWERPC_GOT_TLSGD16_HI: + case elfcpp::R_POWERPC_GOT_TLSGD16_HA: + { + const bool final = gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); + if (tls_type == tls::TLSOPT_NONE) + { + Output_data_got_powerpc* got + = target->got_section(symtab, layout); + got->add_global_pair_with_rel(gsym, GOT_TYPE_TLSGD, + target->rela_dyn_section(layout), + elfcpp::R_POWERPC_DTPMOD, + elfcpp::R_POWERPC_DTPREL); + } + else if (tls_type == tls::TLSOPT_TO_IE) + { + if (!gsym->has_got_offset(GOT_TYPE_TPREL)) + { + Output_data_got_powerpc* 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; - gsym->set_got_offset(GOT_TYPE_STANDARD, off); - rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE, - got, off, 0); + 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_PPC64_TOC: - // We need a GOT section. - target->got_section(symtab, layout); + case elfcpp::R_POWERPC_GOT_DTPREL16: + case elfcpp::R_POWERPC_GOT_DTPREL16_LO: + case elfcpp::R_POWERPC_GOT_DTPREL16_HI: + case elfcpp::R_POWERPC_GOT_DTPREL16_HA: + { + Output_data_got_powerpc* got + = target->got_section(symtab, layout); + if (!gsym->final_value_is_known() + && (gsym->is_from_dynobj() + || gsym->is_undefined() + || gsym->is_preemptible())) + got->add_global_with_rel(gsym, GOT_TYPE_DTPREL, + target->rela_dyn_section(layout), + elfcpp::R_POWERPC_DTPREL); + else + got->add_global_tls(gsym, GOT_TYPE_DTPREL); + } break; case elfcpp::R_POWERPC_GOT_TPREL16: - case elfcpp::R_POWERPC_TLS: - // XXX TLS + 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* 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; - // These are relocations which should only be seen by the - // dynamic linker, and should never be seen here. - 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: - gold_error(_("%s: unexpected reloc %u in object file"), - object->name().c_str(), r_type); + 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: - unsupported_reloc_global(object, r_type, gsym); break; } } @@ -1445,22 +5454,51 @@ Target_powerpc::Scan::global( template void Target_powerpc::gc_process_relocs( - Symbol_table* symtab, - Layout* layout, - Sized_relobj* 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) + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file* object, + unsigned int data_shndx, + unsigned int, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols) { typedef Target_powerpc Powerpc; - typedef typename Target_powerpc::Scan scan; + typedef typename Target_powerpc::Scan Scan; + Powerpc_relobj* ppc_object + = static_cast*>(object); + if (size == 64) + ppc_object->set_opd_valid(); + if (size == 64 && data_shndx == ppc_object->opd_shndx()) + { + typename Powerpc_relobj::Access_from::iterator p; + for (p = ppc_object->access_from_map()->begin(); + p != ppc_object->access_from_map()->end(); + ++p) + { + Address dst_off = p->first; + unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); + typename Powerpc_relobj::Section_refs::iterator s; + for (s = p->second.begin(); s != p->second.end(); ++s) + { + Object* src_obj = s->first; + unsigned int src_indx = s->second; + symtab->gc()->add_reference(src_obj, src_indx, + ppc_object, dst_indx); + } + p->second.clear(); + } + ppc_object->access_from_map()->clear(); + ppc_object->process_gc_mark(symtab); + // Don't look at .opd relocs as .opd will reference everything. + return; + } - gold::gc_process_relocs( + gold::gc_process_relocs( symtab, layout, this, @@ -1474,26 +5512,91 @@ Target_powerpc::gc_process_relocs( plocal_symbols); } +// Handle target specific gc actions when adding a gc reference from +// SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX +// and DST_OFF. For powerpc64, this adds a referenc to the code +// section of a function descriptor. + +template +void +Target_powerpc::do_gc_add_reference( + Symbol_table* symtab, + Object* src_obj, + unsigned int src_shndx, + Object* dst_obj, + unsigned int dst_shndx, + Address dst_off) const +{ + Powerpc_relobj* ppc_object + = static_cast*>(dst_obj); + if (size == 64 + && !ppc_object->is_dynamic() + && dst_shndx == ppc_object->opd_shndx()) + { + if (ppc_object->opd_valid()) + { + dst_shndx = ppc_object->get_opd_ent(dst_off); + symtab->gc()->add_reference(src_obj, src_shndx, dst_obj, dst_shndx); + } + else + { + // If we haven't run scan_opd_relocs, we must delay + // processing this function descriptor reference. + ppc_object->add_reference(src_obj, src_shndx, dst_off); + } + } +} + +// Add any special sections for this symbol to the gc work list. +// For powerpc64, this adds the code section of a function +// descriptor. + +template +void +Target_powerpc::do_gc_mark_symbol( + Symbol_table* symtab, + Symbol* sym) const +{ + if (size == 64) + { + Powerpc_relobj* ppc_object + = static_cast*>(sym->object()); + bool is_ordinary; + unsigned int shndx = sym->shndx(&is_ordinary); + if (is_ordinary && shndx == ppc_object->opd_shndx()) + { + Sized_symbol* gsym = symtab->get_sized_symbol(sym); + Address dst_off = gsym->value(); + if (ppc_object->opd_valid()) + { + unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); + symtab->gc()->worklist().push(Section_id(ppc_object, dst_indx)); + } + else + ppc_object->add_gc_mark(dst_off); + } + } +} + // Scan relocations for a section. template void Target_powerpc::scan_relocs( - Symbol_table* symtab, - Layout* layout, - Sized_relobj* 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) + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols) { typedef Target_powerpc Powerpc; - typedef typename Target_powerpc::Scan scan; - static Output_data_space* sdata; + typedef typename Target_powerpc::Scan Scan; if (sh_type == elfcpp::SHT_REL) { @@ -1502,25 +5605,7 @@ Target_powerpc::scan_relocs( return; } - // Define _SDA_BASE_ at the start of the .sdata section. - if (sdata == NULL) - { - // layout->find_output_section(".sdata") == NULL - sdata = new Output_data_space(4, "** sdata"); - Output_section* os = layout->add_output_section_data(".sdata", 0, - elfcpp::SHF_ALLOC - | elfcpp::SHF_WRITE, - sdata, false); - symtab->define_in_output_data("_SDA_BASE_", NULL, - os, - 32768, 0, - elfcpp::STT_OBJECT, - elfcpp::STB_LOCAL, - elfcpp::STV_HIDDEN, 0, - false, false); - } - - gold::scan_relocs( + gold::scan_relocs( symtab, layout, this, @@ -1534,6 +5619,79 @@ Target_powerpc::scan_relocs( plocal_symbols); } +// Functor class for processing the global symbol table. +// Removes symbols defined on discarded opd entries. + +template +class Global_symbol_visitor_opd +{ + public: + Global_symbol_visitor_opd() + { } + + void + operator()(Sized_symbol<64>* sym) + { + if (sym->has_symtab_index() + || sym->source() != Symbol::FROM_OBJECT + || !sym->in_real_elf()) + return; + + Powerpc_relobj<64, big_endian>* symobj + = static_cast*>(sym->object()); + if (symobj->is_dynamic() + || symobj->opd_shndx() == 0) + return; + + bool is_ordinary; + unsigned int shndx = sym->shndx(&is_ordinary); + if (shndx == symobj->opd_shndx() + && symobj->get_opd_discard(sym->value())) + sym->set_symtab_index(-1U); + } +}; + +template +void +Target_powerpc::define_save_restore_funcs( + Layout* layout, + Symbol_table* symtab) +{ + if (size == 64) + { + Output_data_save_res<64, big_endian>* savres + = new Output_data_save_res<64, big_endian>(symtab); + layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, + elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, + savres, ORDER_TEXT, false); + } +} + +// Sort linker created .got section first (for the header), then input +// sections belonging to files using small model code. + +template +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*>(is1.relobj()) + ->has_small_toc_reloc())); + bool small2 + = (is2.is_input_section() + && (static_cast*>(is2.relobj()) + ->has_small_toc_reloc())); + return small1 && !small2; + } +}; + // Finalize the sections. template @@ -1541,38 +5699,93 @@ void Target_powerpc::do_finalize_sections( Layout* layout, const Input_objects*, - Symbol_table*) + Symbol_table* symtab) { - // Fill in some more dynamic tags. - Output_data_dynamic* const odyn = layout->dynamic_data(); - if (odyn != NULL) + if (parameters->doing_static_link()) { - if (this->plt_ != NULL - && this->plt_->output_section() != NULL) + // 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) { - const Output_data* od = this->plt_->rel_plt(); - odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); - odyn->add_section_address(elfcpp::DT_JMPREL, od); - odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); - - odyn->add_section_address(elfcpp::DT_PLTGOT, this->plt_); + Reloc_section* rel = this->iplt_->rel_plt(); + symtab->define_in_output_data("__rela_iplt_start", NULL, + Symbol_table::PREDEFINED, rel, 0, 0, + elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, + elfcpp::STV_HIDDEN, 0, false, true); + symtab->define_in_output_data("__rela_iplt_end", NULL, + Symbol_table::PREDEFINED, rel, 0, 0, + elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, + elfcpp::STV_HIDDEN, 0, true, true); + } + else + { + symtab->define_as_constant("__rela_iplt_start", NULL, + Symbol_table::PREDEFINED, 0, 0, + elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, + elfcpp::STV_HIDDEN, 0, true, false); + symtab->define_as_constant("__rela_iplt_end", NULL, + Symbol_table::PREDEFINED, 0, 0, + elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, + elfcpp::STV_HIDDEN, 0, true, false); } + } + + if (size == 64) + { + typedef Global_symbol_visitor_opd Symbol_visitor; + symtab->for_all_symbols<64, Symbol_visitor>(Symbol_visitor()); - if (this->rela_dyn_ != NULL - && this->rela_dyn_->output_section() != NULL) + if (!parameters->options().relocatable()) { - const Output_data* od = this->rela_dyn_; - odyn->add_section_address(elfcpp::DT_RELA, od); - odyn->add_section_size(elfcpp::DT_RELASZ, od); - odyn->add_constant(elfcpp::DT_RELAENT, - elfcpp::Elf_sizes::rela_size); + 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()); + } } + } + + // 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 (!parameters->options().shared()) + if (size == 32) { - // The value of the DT_DEBUG tag is filled in by the dynamic - // linker at run time, and used by the debugger. - odyn->add_constant(elfcpp::DT_DEBUG, 0); + 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)); + } } } @@ -1582,292 +5795,991 @@ Target_powerpc::do_finalize_sections( this->copy_relocs_.emit(this->rela_dyn_section(layout)); } -// Perform a relocation. +// 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 -inline bool -Target_powerpc::Relocate::relocate( - const Relocate_info* relinfo, - Target_powerpc* target, - Output_section*, - size_t relnum, - const elfcpp::Rela& rela, - unsigned int r_type, - const Sized_symbol* gsym, - const Symbol_value* psymval, - unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr address, - section_size_type /* view_size */) -{ - const unsigned int toc_base_offset = 0x8000; - typedef Powerpc_relocate_functions Reloc; +typename Target_powerpc::Address +Target_powerpc::symval_for_branch( + Address value, + const Sized_symbol* gsym, + Powerpc_relobj* object, + unsigned int *dest_shndx) +{ + *dest_shndx = 0; + if (size == 32) + return value; - // Pick the value to use for symbols defined in shared objects. - Symbol_value symval; + // If the symbol is defined in an opd section, ie. is a function + // descriptor, use the function descriptor code entry address + Powerpc_relobj* symobj = object; if (gsym != NULL - && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24 - || r_type == elfcpp::R_PPC_LOCAL24PC - || r_type == elfcpp::R_PPC_REL16 - || r_type == elfcpp::R_PPC_REL16_LO - || r_type == elfcpp::R_PPC_REL16_HI - || r_type == elfcpp::R_PPC_REL16_HA)) + && gsym->source() != Symbol::FROM_OBJECT) + return value; + if (gsym != NULL) + symobj = static_cast*>(gsym->object()); + unsigned int shndx = symobj->opd_shndx(); + if (shndx == 0) + return value; + Address opd_addr = symobj->get_output_section_offset(shndx); + gold_assert(opd_addr != invalid_address); + opd_addr += symobj->output_section(shndx)->address(); + if (value >= opd_addr && value < opd_addr + symobj->section_size(shndx)) { - elfcpp::Elf_Xword value; + Address sec_off; + *dest_shndx = symobj->get_opd_ent(value - opd_addr, &sec_off); + Address sec_addr = symobj->get_output_section_offset(*dest_shndx); + gold_assert(sec_addr != invalid_address); + sec_addr += symobj->output_section(*dest_shndx)->address(); + value = sec_addr + sec_off; + } + return value; +} - value = target->plt_section()->address() + gsym->plt_offset(); +// Perform a relocation. - symval.set_output_value(value); +template +inline bool +Target_powerpc::Relocate::relocate( + const Relocate_info* relinfo, + Target_powerpc* target, + Output_section* os, + size_t relnum, + const elfcpp::Rela& rela, + unsigned int r_type, + const Sized_symbol* gsym, + const Symbol_value* psymval, + unsigned char* view, + Address address, + section_size_type view_size) +{ + 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; + } - psymval = &symval; + typedef Powerpc_relocate_functions Reloc; + typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn; + Powerpc_relobj* const object + = static_cast*>(relinfo->object); + Address value = 0; + bool has_plt_value = false; + unsigned int r_sym = elfcpp::elf_r_sym(rela.get_r_info()); + if (gsym != NULL + ? use_plt_offset(gsym, Scan::get_reference_flags(r_type)) + : object->local_has_plt_offset(r_sym)) + { + Stub_table* 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_plt_value = true; } - const Sized_relobj* object = relinfo->object; - elfcpp::Elf_Xword addend = rela.get_r_addend(); + if (r_type == elfcpp::R_POWERPC_GOT16 + || r_type == elfcpp::R_POWERPC_GOT16_LO + || r_type == elfcpp::R_POWERPC_GOT16_HI + || r_type == elfcpp::R_POWERPC_GOT16_HA + || r_type == elfcpp::R_PPC64_GOT16_DS + || r_type == elfcpp::R_PPC64_GOT16_LO_DS) + { + if (gsym != NULL) + { + gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); + value = gsym->got_offset(GOT_TYPE_STANDARD); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); + value = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); + } + value -= target->got_section()->got_base_offset(object); + } + else if (r_type == elfcpp::R_PPC64_TOC) + { + value = (target->got_section()->output_section()->address() + + object->toc_base_offset()); + } + else if (gsym != NULL + && (r_type == elfcpp::R_POWERPC_REL24 + || r_type == elfcpp::R_PPC_PLTREL24) + && has_plt_value) + { + if (size == 64) + { + typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; + Valtype* wv = reinterpret_cast(view); + bool can_plt_call = false; + if (rela.get_r_offset() + 8 <= view_size) + { + Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv); + Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1); + if ((insn & 1) != 0 + && (insn2 == nop + || insn2 == cror_15_15_15 || insn2 == cror_31_31_31)) + { + elfcpp::Swap<32, big_endian>::writeval(wv + 1, ld_2_1 + 40); + can_plt_call = true; + } + } + if (!can_plt_call) + { + // If we don't have a branch and link followed by a nop, + // we can't go via the plt because there is no place to + // put a toc restoring instruction. + // Unless we know we won't be returning. + if (strcmp(gsym->name(), "__libc_start_main") == 0) + can_plt_call = true; + } + if (!can_plt_call) + { + // This is not an error in one special case: A self + // call. It isn't possible to cheaply verify we have + // such a call so just check for a call to the same + // section. + bool ok = false; + Address code = value; + if (gsym->source() == Symbol::FROM_OBJECT + && gsym->object() == object) + { + Address addend = rela.get_r_addend(); + unsigned int dest_shndx; + Address opdent = psymval->value(object, addend); + code = target->symval_for_branch(opdent, gsym, object, + &dest_shndx); + bool is_ordinary; + if (dest_shndx == 0) + dest_shndx = gsym->shndx(&is_ordinary); + ok = dest_shndx == relinfo->data_shndx; + } + if (!ok) + { + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("call lacks nop, can't restore toc; " + "recompile with -fPIC")); + value = code; + } + } + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) + { + // First instruction of a global dynamic sequence, arg setup insn. + const bool final = gsym == NULL || gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); + enum Got_type got_type = GOT_TYPE_STANDARD; + if (tls_type == tls::TLSOPT_NONE) + got_type = GOT_TYPE_TLSGD; + else if (tls_type == tls::TLSOPT_TO_IE) + got_type = GOT_TYPE_TPREL; + if (got_type != GOT_TYPE_STANDARD) + { + if (gsym != NULL) + { + gold_assert(gsym->has_got_offset(got_type)); + value = gsym->got_offset(got_type); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, got_type)); + value = object->local_got_offset(r_sym, got_type); + } + value -= target->got_section()->got_base_offset(object); + } + if (tls_type == tls::TLSOPT_TO_IE) + { + if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) + { + Insn* iview = reinterpret_cast(view - 2 * big_endian); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + insn &= (1 << 26) - (1 << 16); // extract rt,ra from addi + if (size == 32) + insn |= 32 << 26; // lwz + else + insn |= 58 << 26; // ld + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + } + r_type += (elfcpp::R_POWERPC_GOT_TPREL16 + - elfcpp::R_POWERPC_GOT_TLSGD16); + } + else if (tls_type == tls::TLSOPT_TO_LE) + { + if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) + { + Insn* iview = reinterpret_cast(view - 2 * big_endian); + Insn insn = addis_3_13; + if (size == 32) + insn = addis_3_2; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_HA; + value = psymval->value(object, rela.get_r_addend()); + } + else + { + Insn* iview = reinterpret_cast(view - 2 * big_endian); + Insn insn = nop; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_NONE; + } + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) + { + // First instruction of a local dynamic sequence, arg setup insn. + const tls::Tls_optimization tls_type = target->optimize_tls_ld(); + if (tls_type == tls::TLSOPT_NONE) + { + value = target->tlsld_got_offset(); + value -= target->got_section()->got_base_offset(object); + } + else + { + gold_assert(tls_type == tls::TLSOPT_TO_LE); + if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) + { + Insn* iview = reinterpret_cast(view - 2 * big_endian); + Insn insn = addis_3_13; + if (size == 32) + insn = addis_3_2; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_HA; + value = dtp_offset; + } + else + { + Insn* iview = reinterpret_cast(view - 2 * big_endian); + Insn insn = nop; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_NONE; + } + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_DTPREL16 + || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_LO + || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HI + || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HA) + { + // Accesses relative to a local dynamic sequence address, + // no optimisation here. + if (gsym != NULL) + { + gold_assert(gsym->has_got_offset(GOT_TYPE_DTPREL)); + value = gsym->got_offset(GOT_TYPE_DTPREL); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_DTPREL)); + value = object->local_got_offset(r_sym, GOT_TYPE_DTPREL); + } + value -= target->got_section()->got_base_offset(object); + } + else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) + { + // First instruction of initial exec sequence. + const bool final = gsym == NULL || gsym->final_value_is_known(); + const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); + if (tls_type == tls::TLSOPT_NONE) + { + if (gsym != NULL) + { + gold_assert(gsym->has_got_offset(GOT_TYPE_TPREL)); + value = gsym->got_offset(GOT_TYPE_TPREL); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_TPREL)); + value = object->local_got_offset(r_sym, GOT_TYPE_TPREL); + } + value -= target->got_section()->got_base_offset(object); + } + else + { + gold_assert(tls_type == tls::TLSOPT_TO_LE); + if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) + { + Insn* iview = reinterpret_cast(view - 2 * big_endian); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + insn &= (1 << 26) - (1 << 21); // extract rt from ld + if (size == 32) + insn |= addis_0_2; + else + insn |= addis_0_13; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_HA; + value = psymval->value(object, rela.get_r_addend()); + } + else + { + Insn* iview = reinterpret_cast(view - 2 * big_endian); + Insn insn = nop; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_NONE; + } + } + } + else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) + { + // Second instruction of a global dynamic sequence, + // the __tls_get_addr call + this->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(view); + Insn insn = add_3_3_13; + if (size == 32) + insn = add_3_3_2; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_NONE; + } + else + { + Insn* iview = reinterpret_cast(view); + Insn insn = addi_3_3; + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_LO; + view += 2 * big_endian; + value = psymval->value(object, rela.get_r_addend()); + } + this->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(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(view); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + unsigned int reg = size == 32 ? 2 : 13; + insn = at_tls_transform(insn, reg); + gold_assert(insn != 0); + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + r_type = elfcpp::R_POWERPC_TPREL16_LO; + view += 2 * big_endian; + value = psymval->value(object, rela.get_r_addend()); + } + } + else if (!has_plt_value) + { + Address addend = 0; + unsigned int dest_shndx; + if (r_type != elfcpp::R_PPC_PLTREL24) + addend = rela.get_r_addend(); + value = psymval->value(object, addend); + if (size == 64 && is_branch_reloc(r_type)) + value = target->symval_for_branch(value, gsym, object, &dest_shndx); + unsigned int 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* stub_table + = object->stub_table(relinfo->data_shndx); + gold_assert(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; + } + } - // Get the GOT offset if needed. Unlike i386 and x86_64, our GOT - // pointer points to the beginning, not the end, of the table. - // So we just use the plain offset. - bool have_got_offset = false; - unsigned int got_offset = 0; - unsigned int got2_offset = 0; 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. - addend -= target->toc_section()->address() + toc_base_offset; - /* FALLTHRU */ + // Subtract the TOC base address. + value -= (target->got_section()->output_section()->address() + + object->toc_base_offset()); + break; + + case elfcpp::R_POWERPC_SECTOFF: + case elfcpp::R_POWERPC_SECTOFF_LO: + case elfcpp::R_POWERPC_SECTOFF_HI: + case elfcpp::R_POWERPC_SECTOFF_HA: + case elfcpp::R_PPC64_SECTOFF_DS: + case elfcpp::R_PPC64_SECTOFF_LO_DS: + if (os != NULL) + value -= os->address(); + break; + + case elfcpp::R_PPC64_TPREL16_DS: + case elfcpp::R_PPC64_TPREL16_LO_DS: + if (size != 64) + // R_PPC_TLSGD and R_PPC_TLSLD + break; + case elfcpp::R_POWERPC_TPREL16: + case elfcpp::R_POWERPC_TPREL16_LO: + case elfcpp::R_POWERPC_TPREL16_HI: + case elfcpp::R_POWERPC_TPREL16_HA: + case elfcpp::R_POWERPC_TPREL: + case elfcpp::R_PPC64_TPREL16_HIGHER: + case elfcpp::R_PPC64_TPREL16_HIGHERA: + case elfcpp::R_PPC64_TPREL16_HIGHEST: + case elfcpp::R_PPC64_TPREL16_HIGHESTA: + // tls symbol values are relative to tls_segment()->vaddr() + value -= tp_offset; + break; + + case elfcpp::R_PPC64_DTPREL16_DS: + case elfcpp::R_PPC64_DTPREL16_LO_DS: + case elfcpp::R_PPC64_DTPREL16_HIGHER: + case elfcpp::R_PPC64_DTPREL16_HIGHERA: + case elfcpp::R_PPC64_DTPREL16_HIGHEST: + case elfcpp::R_PPC64_DTPREL16_HIGHESTA: + if (size != 64) + // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16, R_PPC_EMB_NADDR16_LO + // R_PPC_EMB_NADDR16_HI, R_PPC_EMB_NADDR16_HA, R_PPC_EMB_SDAI16 + break; + case elfcpp::R_POWERPC_DTPREL16: + case elfcpp::R_POWERPC_DTPREL16_LO: + case elfcpp::R_POWERPC_DTPREL16_HI: + case elfcpp::R_POWERPC_DTPREL16_HA: + case elfcpp::R_POWERPC_DTPREL: + // tls symbol values are relative to tls_segment()->vaddr() + value -= dtp_offset; + break; + + default: + break; + } + + Insn branch_bit = 0; + switch (r_type) + { + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + branch_bit = 1 << 21; + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + { + Insn* iview = reinterpret_cast(view); + Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); + insn &= ~(1 << 21); + insn |= branch_bit; + if (this->is_isa_v2) + { + // Set 'a' bit. This is 0b00010 in BO field for branch + // on CR(BI) insns (BO == 001at or 011at), and 0b01000 + // for branch on CTR insns (BO == 1a00t or 1a01t). + if ((insn & (0x14 << 21)) == (0x04 << 21)) + insn |= 0x02 << 21; + else if ((insn & (0x14 << 21)) == (0x10 << 21)) + insn |= 0x08 << 21; + else + break; + } + else + { + // Invert 'y' bit if not the default. + if (static_cast(value) < 0) + insn ^= 1 << 21; + } + elfcpp::Swap<32, big_endian>::writeval(iview, insn); + } + break; - 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: - if (gsym != NULL) - { - gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); - got_offset = gsym->got_offset(GOT_TYPE_STANDARD); - } - else - { - unsigned int r_sym = elfcpp::elf_r_sym(rela.get_r_info()); - gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); - got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); - } - have_got_offset = true; + default: break; + } - // R_PPC_PLTREL24 is rather special. If non-zero, - // the addend specifies the GOT pointer offset within .got2. - case elfcpp::R_PPC_PLTREL24: - if (addend >= 32768) + 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) { - Output_data_space* got2; - got2 = target->got2_section(); - got2_offset = got2->offset(); - addend += got2_offset; - } - have_got_offset = true; - break; + default: + break; - 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(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(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; switch (r_type) { - case elfcpp::R_POWERPC_NONE: - case elfcpp::R_POWERPC_GNU_VTINHERIT: - case elfcpp::R_POWERPC_GNU_VTENTRY: + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_UADDR32: + if (size == 64) + overflow = Reloc::CHECK_BITFIELD; break; case elfcpp::R_POWERPC_REL32: - Reloc::rel32(view, object, psymval, addend, address); + if (size == 64) + overflow = Reloc::CHECK_SIGNED; break; - case elfcpp::R_POWERPC_REL24: - Reloc::rel24(view, object, psymval, addend, address); - break; - - case elfcpp::R_POWERPC_REL14: - Reloc::rel14(view, object, psymval, addend, address); + case elfcpp::R_POWERPC_ADDR24: + case elfcpp::R_POWERPC_ADDR16: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_PPC64_ADDR16_DS: + case elfcpp::R_POWERPC_ADDR14: + case elfcpp::R_POWERPC_ADDR14_BRTAKEN: + case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: + overflow = Reloc::CHECK_BITFIELD; break; + case elfcpp::R_POWERPC_REL24: case elfcpp::R_PPC_PLTREL24: - Reloc::rel24(view, object, psymval, addend, address); - break; - case elfcpp::R_PPC_LOCAL24PC: - Reloc::rel24(view, object, psymval, addend, address); - break; - - case elfcpp::R_PPC64_ADDR64: - if (!parameters->options().output_is_position_independent()) - Relocate_functions::rela64(view, object, - psymval, addend); + case elfcpp::R_POWERPC_REL16: + case elfcpp::R_PPC64_TOC16: + case elfcpp::R_POWERPC_GOT16: + case elfcpp::R_POWERPC_SECTOFF: + case elfcpp::R_POWERPC_TPREL16: + case elfcpp::R_POWERPC_DTPREL16: + case elfcpp::R_PPC64_TPREL16_DS: + case elfcpp::R_PPC64_DTPREL16_DS: + case elfcpp::R_PPC64_TOC16_DS: + case elfcpp::R_PPC64_GOT16_DS: + case elfcpp::R_PPC64_SECTOFF_DS: + case elfcpp::R_POWERPC_REL14: + case elfcpp::R_POWERPC_REL14_BRTAKEN: + case elfcpp::R_POWERPC_REL14_BRNTAKEN: + case elfcpp::R_POWERPC_GOT_TLSGD16: + case elfcpp::R_POWERPC_GOT_TLSLD16: + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_GOT_DTPREL16: + overflow = Reloc::CHECK_SIGNED; break; + } - case elfcpp::R_POWERPC_ADDR32: - if (!parameters->options().output_is_position_independent()) - Relocate_functions::rela32(view, object, - psymval, addend); + typename Powerpc_relocate_functions::Status status + = Powerpc_relocate_functions::STATUS_OK; + switch (r_type) + { + case elfcpp::R_POWERPC_NONE: + case elfcpp::R_POWERPC_TLS: + case elfcpp::R_POWERPC_GNU_VTINHERIT: + case elfcpp::R_POWERPC_GNU_VTENTRY: + case elfcpp::R_PPC_EMB_MRKREF: break; - case elfcpp::R_POWERPC_ADDR16_LO: - Reloc::addr16_lo(view, object, psymval, addend); + case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_PPC64_REL64: + case elfcpp::R_PPC64_TOC: + Reloc::addr64(view, value); break; - case elfcpp::R_POWERPC_ADDR16_HI: - Reloc::addr16_hi(view, object, psymval, addend); + 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_POWERPC_ADDR16_HA: - Reloc::addr16_ha(view, object, psymval, addend); + case elfcpp::R_PPC64_UADDR64: + Reloc::addr64_u(view, value); break; - case elfcpp::R_PPC_REL16_LO: - Reloc::rel16_lo(view, object, psymval, addend, address); + case elfcpp::R_POWERPC_ADDR32: + status = Reloc::addr32(view, value, overflow); break; - case elfcpp::R_PPC_REL16_HI: - Reloc::rel16_lo(view, object, psymval, addend, address); + case elfcpp::R_POWERPC_REL32: + case elfcpp::R_POWERPC_UADDR32: + status = Reloc::addr32_u(view, value, overflow); break; - case elfcpp::R_PPC_REL16_HA: - Reloc::rel16_ha(view, object, psymval, addend, address); + 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: - Reloc::addr16(view, got_offset, addend); + 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_GOT16_LO: - Reloc::addr16_lo(view, got_offset, addend); + case elfcpp::R_POWERPC_UADDR16: + status = Reloc::addr16_u(view, value, overflow); break; + case elfcpp::R_POWERPC_ADDR16_HI: + case elfcpp::R_POWERPC_REL16_HI: + case elfcpp::R_PPC64_TOC16_HI: case elfcpp::R_POWERPC_GOT16_HI: - Reloc::addr16_hi(view, got_offset, addend); + case elfcpp::R_POWERPC_SECTOFF_HI: + case elfcpp::R_POWERPC_TPREL16_HI: + case elfcpp::R_POWERPC_DTPREL16_HI: + case elfcpp::R_POWERPC_GOT_TLSGD16_HI: + case elfcpp::R_POWERPC_GOT_TLSLD16_HI: + case elfcpp::R_POWERPC_GOT_TPREL16_HI: + case elfcpp::R_POWERPC_GOT_DTPREL16_HI: + Reloc::addr16_hi(view, value); break; + case elfcpp::R_POWERPC_ADDR16_HA: + case elfcpp::R_POWERPC_REL16_HA: + case elfcpp::R_PPC64_TOC16_HA: case elfcpp::R_POWERPC_GOT16_HA: - Reloc::addr16_ha(view, got_offset, addend); + 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_TOC16: - Reloc::addr16(view, got_offset, addend); + 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_TOC16_LO: - Reloc::addr16_lo(view, got_offset, addend); + 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_TOC16_HI: - Reloc::addr16_hi(view, got_offset, addend); + 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_TOC16_HA: - Reloc::addr16_ha(view, got_offset, addend); + 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: - Reloc::addr16_ds(view, got_offset, addend); + 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_PPC64_TOC: - { - elfcpp::Elf_types<64>::Elf_Addr value; - value = target->toc_section()->address() + toc_base_offset; - Relocate_functions<64, false>::rela64(view, value, addend); - } + 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: - // This is an outstanding tls reloc, which is unexpected when - // linking. case elfcpp::R_POWERPC_DTPMOD: + case elfcpp::R_PPC64_JMP_IREL: + case elfcpp::R_POWERPC_IRELATIVE: gold_error_at_location(relinfo, relnum, rela.get_r_offset(), _("unexpected reloc %u in object file"), r_type); break; + case elfcpp::R_PPC_EMB_SDA21: + if (size == 32) + goto unsupp; + else + { + // R_PPC64_TOCSAVE. For the time being this can be ignored. + } + break; + + case elfcpp::R_PPC_EMB_SDA2I16: + case elfcpp::R_PPC_EMB_SDA2REL: + if (size == 32) + goto unsupp; + // R_PPC64_TLSGD, R_PPC64_TLSLD + break; + + case elfcpp::R_POWERPC_PLT32: + case elfcpp::R_POWERPC_PLTREL32: + case elfcpp::R_POWERPC_PLT16_LO: + case elfcpp::R_POWERPC_PLT16_HI: + case elfcpp::R_POWERPC_PLT16_HA: + case elfcpp::R_PPC_SDAREL16: + case elfcpp::R_POWERPC_ADDR30: + case elfcpp::R_PPC64_PLT64: + case elfcpp::R_PPC64_PLTREL64: + case elfcpp::R_PPC64_PLTGOT16: + case elfcpp::R_PPC64_PLTGOT16_LO: + case elfcpp::R_PPC64_PLTGOT16_HI: + case elfcpp::R_PPC64_PLTGOT16_HA: + case elfcpp::R_PPC64_PLT16_LO_DS: + case elfcpp::R_PPC64_PLTGOT16_DS: + case elfcpp::R_PPC64_PLTGOT16_LO_DS: + case elfcpp::R_PPC_EMB_RELSEC16: + case elfcpp::R_PPC_EMB_RELST_LO: + case elfcpp::R_PPC_EMB_RELST_HI: + case elfcpp::R_PPC_EMB_RELST_HA: + case elfcpp::R_PPC_EMB_BIT_FLD: + case elfcpp::R_PPC_EMB_RELSDA: + case elfcpp::R_PPC_TOC16: default: + unsupp: gold_error_at_location(relinfo, relnum, rela.get_r_offset(), _("unsupported reloc %u"), r_type); break; } + if (status != Powerpc_relocate_functions::STATUS_OK) + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("relocation overflow")); return true; } -// Perform a TLS relocation. - -template -inline void -Target_powerpc::Relocate::relocate_tls( - const Relocate_info* relinfo, - Target_powerpc* target, - size_t relnum, - const elfcpp::Rela& rela, - unsigned int r_type, - const Sized_symbol* gsym, - const Symbol_value* psymval, - unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr address, - section_size_type) -{ - Output_segment* tls_segment = relinfo->layout->tls_segment(); - typedef Powerpc_relocate_functions Reloc; - const Sized_relobj* object = relinfo->object; - - const elfcpp::Elf_Xword addend = rela.get_r_addend(); - typename elfcpp::Elf_types::Elf_Addr value = psymval->value(object, 0); - - const bool is_final = - (gsym == NULL - ? !parameters->options().output_is_position_independent() - : gsym->final_value_is_known()); - const tls::Tls_optimization optimized_type - = optimize_tls_reloc(is_final, r_type); - - switch (r_type) - { - // XXX - } -} - // Relocate section data. template void Target_powerpc::relocate_section( - const Relocate_info* relinfo, - unsigned int sh_type, - const unsigned char* prelocs, - size_t reloc_count, - Output_section* output_section, - bool needs_special_offset_handling, - unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr address, - section_size_type view_size, - const Reloc_symbol_changes* reloc_symbol_changes) + const Relocate_info* relinfo, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + unsigned char* view, + Address address, + section_size_type view_size, + const Reloc_symbol_changes* reloc_symbol_changes) { typedef Target_powerpc Powerpc; typedef typename Target_powerpc::Relocate Powerpc_relocate; + typedef typename Target_powerpc::Relocate_comdat_behavior + Powerpc_comdat_behavior; gold_assert(sh_type == elfcpp::SHT_RELA); gold::relocate_section( + Powerpc_relocate, Powerpc_comdat_behavior>( relinfo, this, prelocs, @@ -1880,45 +6792,60 @@ Target_powerpc::relocate_section( reloc_symbol_changes); } -// Return the size of a relocation while scanning during a relocatable -// link. - -template -unsigned int -Target_powerpc::Relocatable_size_for_reloc::get_size_for_reloc( - unsigned int, - Relobj*) +class Powerpc_scan_relocatable_reloc { - // We are always SHT_RELA, so we should never get here. - gold_unreachable(); - return 0; -} +public: + // Return the strategy to use for a local symbol which is not a + // section symbol, given the relocation type. + inline Relocatable_relocs::Reloc_strategy + local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym) + { + if (r_type == 0 && r_sym == 0) + return Relocatable_relocs::RELOC_DISCARD; + return Relocatable_relocs::RELOC_COPY; + } + + // Return the strategy to use for a local symbol which is a section + // symbol, given the relocation type. + inline Relocatable_relocs::Reloc_strategy + local_section_strategy(unsigned int, Relobj*) + { + return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; + } + + // Return the strategy to use for a global symbol, given the + // relocation type, the object, and the symbol index. + inline Relocatable_relocs::Reloc_strategy + global_strategy(unsigned int r_type, Relobj*, unsigned int) + { + if (r_type == elfcpp::R_PPC_PLTREL24) + return Relocatable_relocs::RELOC_SPECIAL; + return Relocatable_relocs::RELOC_COPY; + } +}; // Scan the relocs during a relocatable link. template void Target_powerpc::scan_relocatable_relocs( - Symbol_table* symtab, - Layout* layout, - Sized_relobj* 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) + Symbol_table* symtab, + Layout* layout, + Sized_relobj_file* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols, + Relocatable_relocs* rr) { gold_assert(sh_type == elfcpp::SHT_RELA); - typedef gold::Default_scan_relocatable_relocs Scan_relocatable_relocs; - gold::scan_relocatable_relocs( + Powerpc_scan_relocatable_reloc>( symtab, layout, object, @@ -1932,41 +6859,304 @@ Target_powerpc::scan_relocatable_relocs( rr); } -// Relocate a section during a relocatable link. +// Emit relocations for a section. +// This is a modified version of the function by the same name in +// target-reloc.h. Using relocate_special_relocatable for +// R_PPC_PLTREL24 would require duplication of the entire body of the +// loop, so we may as well duplicate the whole thing. template void -Target_powerpc::relocate_for_relocatable( +Target_powerpc::relocate_relocs( const Relocate_info* relinfo, unsigned int sh_type, const unsigned char* prelocs, size_t reloc_count, Output_section* output_section, - off_t offset_in_output_section, + typename elfcpp::Elf_types::Elf_Off offset_in_output_section, const Relocatable_relocs* rr, - unsigned char* view, - typename elfcpp::Elf_types::Elf_Addr view_address, - section_size_type view_size, + 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); - gold::relocate_for_relocatable( - relinfo, - prelocs, - reloc_count, - output_section, - offset_in_output_section, - rr, - view, - view_address, - view_size, - reloc_view, - reloc_view_size); + typedef typename Reloc_types::Reloc + Reltype; + typedef typename Reloc_types::Reloc_write + Reltype_write; + const int reloc_size + = Reloc_types::reloc_size; + + Powerpc_relobj* const object + = static_cast*>(relinfo->object); + const unsigned int local_count = object->local_symbol_count(); + unsigned int got2_shndx = object->got2_shndx(); + Address got2_addend = 0; + if (got2_shndx != 0) + { + got2_addend = object->get_output_section_offset(got2_shndx); + gold_assert(got2_addend != invalid_address); + } + + unsigned char* pwrite = reloc_view; + bool zap_next = false; + for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) + { + Relocatable_relocs::Reloc_strategy strategy = rr->strategy(i); + if (strategy == Relocatable_relocs::RELOC_DISCARD) + continue; + + Reltype reloc(prelocs); + Reltype_write reloc_write(pwrite); + + Address offset = reloc.get_r_offset(); + typename elfcpp::Elf_types::Elf_WXword r_info = reloc.get_r_info(); + unsigned int r_sym = elfcpp::elf_r_sym(r_info); + unsigned int r_type = elfcpp::elf_r_type(r_info); + const unsigned int orig_r_sym = r_sym; + typename elfcpp::Elf_types::Elf_Swxword addend + = reloc.get_r_addend(); + const Symbol* gsym = NULL; + + if (zap_next) + { + // We could arrange to discard these and other relocs for + // tls optimised sequences in the strategy methods, but for + // now do as BFD ld does. + r_type = elfcpp::R_POWERPC_NONE; + zap_next = false; + } + + // Get the new symbol index. + if (r_sym < local_count) + { + switch (strategy) + { + case Relocatable_relocs::RELOC_COPY: + case Relocatable_relocs::RELOC_SPECIAL: + if (r_sym != 0) + { + r_sym = object->symtab_index(r_sym); + gold_assert(r_sym != -1U); + } + break; + + case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA: + { + // We are adjusting a section symbol. We need to find + // the symbol table index of the section symbol for + // the output section corresponding to input section + // in which this symbol is defined. + gold_assert(r_sym < local_count); + bool is_ordinary; + unsigned int shndx = + object->local_symbol_input_shndx(r_sym, &is_ordinary); + gold_assert(is_ordinary); + Output_section* os = object->output_section(shndx); + gold_assert(os != NULL); + gold_assert(os->needs_symtab_index()); + r_sym = os->symtab_index(); + } + break; + + default: + gold_unreachable(); + } + } + else + { + gsym = object->global_symbol(r_sym); + gold_assert(gsym != NULL); + if (gsym->is_forwarder()) + gsym = relinfo->symtab->resolve_forwards(gsym); + + gold_assert(gsym->has_symtab_index()); + r_sym = gsym->symtab_index(); + } + + // Get the new offset--the location in the output section where + // this relocation should be applied. + if (static_cast
(offset_in_output_section) != invalid_address) + offset += offset_in_output_section; + else + { + section_offset_type sot_offset = + convert_types(offset); + section_offset_type new_sot_offset = + output_section->output_offset(object, relinfo->data_shndx, + sot_offset); + gold_assert(new_sot_offset != -1); + offset = new_sot_offset; + } + + // In an object file, r_offset is an offset within the section. + // In an executable or dynamic object, generated by + // --emit-relocs, r_offset is an absolute address. + if (!parameters->options().relocatable()) + { + offset += view_address; + if (static_cast
(offset_in_output_section) != invalid_address) + offset -= offset_in_output_section; + } + + // Handle the reloc addend based on the strategy. + if (strategy == Relocatable_relocs::RELOC_COPY) + ; + else if (strategy == Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA) + { + const Symbol_value* psymval = object->local_symbol(orig_r_sym); + addend = psymval->value(object, addend); + } + else if (strategy == Relocatable_relocs::RELOC_SPECIAL) + { + if (addend >= 32768) + addend += got2_addend; + } + else + gold_unreachable(); + + if (!parameters->options().relocatable()) + { + if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) + { + // First instruction of a global dynamic sequence, + // arg setup insn. + const bool final = gsym == NULL || gsym->final_value_is_known(); + switch (this->optimize_tls_gd(final)) + { + case tls::TLSOPT_TO_IE: + r_type += (elfcpp::R_POWERPC_GOT_TPREL16 + - elfcpp::R_POWERPC_GOT_TLSGD16); + break; + case tls::TLSOPT_TO_LE: + if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) + r_type = elfcpp::R_POWERPC_TPREL16_HA; + else + { + r_type = elfcpp::R_POWERPC_NONE; + offset -= 2 * big_endian; + } + break; + default: + break; + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) + { + // First instruction of a local dynamic sequence, + // arg setup insn. + if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) + { + if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 + || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) + { + r_type = elfcpp::R_POWERPC_TPREL16_HA; + const Output_section* os = relinfo->layout->tls_segment() + ->first_section(); + gold_assert(os != NULL); + gold_assert(os->needs_symtab_index()); + r_sym = os->symtab_index(); + addend = dtp_offset; + } + else + { + r_type = elfcpp::R_POWERPC_NONE; + offset -= 2 * big_endian; + } + } + } + else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) + { + // First instruction of initial exec sequence. + const bool final = gsym == NULL || gsym->final_value_is_known(); + if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) + { + if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 + || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) + r_type = elfcpp::R_POWERPC_TPREL16_HA; + else + { + r_type = elfcpp::R_POWERPC_NONE; + offset -= 2 * big_endian; + } + } + } + else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) + { + // Second instruction of a global dynamic sequence, + // the __tls_get_addr call + const bool final = gsym == NULL || gsym->final_value_is_known(); + switch (this->optimize_tls_gd(final)) + { + case tls::TLSOPT_TO_IE: + r_type = elfcpp::R_POWERPC_NONE; + zap_next = true; + break; + case tls::TLSOPT_TO_LE: + r_type = elfcpp::R_POWERPC_TPREL16_LO; + offset += 2 * big_endian; + zap_next = true; + break; + default: + break; + } + } + else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) + || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) + { + // Second instruction of a local dynamic sequence, + // the __tls_get_addr call + if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) + { + const Output_section* os = relinfo->layout->tls_segment() + ->first_section(); + gold_assert(os != NULL); + gold_assert(os->needs_symtab_index()); + r_sym = os->symtab_index(); + addend = dtp_offset; + r_type = elfcpp::R_POWERPC_TPREL16_LO; + offset += 2 * big_endian; + zap_next = true; + } + } + else if (r_type == elfcpp::R_POWERPC_TLS) + { + // Second instruction of an initial exec sequence + const bool final = gsym == NULL || gsym->final_value_is_known(); + if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) + { + r_type = elfcpp::R_POWERPC_TPREL16_LO; + offset += 2 * big_endian; + } + } + } + + reloc_write.put_r_offset(offset); + reloc_write.put_r_info(elfcpp::elf_r_info(r_sym, r_type)); + reloc_write.put_r_addend(addend); + + pwrite += reloc_size; + } + + gold_assert(static_cast(pwrite - reloc_view) + == reloc_view_size); } -// Return the value to use for a dynamic which requires special +// 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. @@ -1975,8 +7165,126 @@ template uint64_t Target_powerpc::do_dynsym_value(const Symbol* gsym) const { - gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); - return this->plt_section()->address() + gsym->plt_offset(); + 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; + } + } + gold_unreachable(); +} + +// Return the PLT address to use for a local symbol. +template +uint64_t +Target_powerpc::do_plt_address_for_local( + const Relobj* object, + unsigned int symndx) const +{ + if (size == 32) + { + const Sized_relobj* relobj + = static_cast*>(object); + 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 +uint64_t +Target_powerpc::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; + } + } + gold_unreachable(); +} + +// Return the offset to use for the GOT_INDX'th got entry which is +// for a local tls symbol specified by OBJECT, SYMNDX. +template +int64_t +Target_powerpc::do_tls_offset_for_local( + const Relobj* object, + unsigned int symndx, + unsigned int got_indx) const +{ + const Powerpc_relobj* ppc_object + = static_cast*>(object); + if (ppc_object->local_symbol(symndx)->is_tls_symbol()) + { + for (Got_type got_type = GOT_TYPE_TLSGD; + got_type <= GOT_TYPE_TPREL; + got_type = Got_type(got_type + 1)) + if (ppc_object->local_has_got_offset(symndx, got_type)) + { + unsigned int off = ppc_object->local_got_offset(symndx, got_type); + if (got_type == GOT_TYPE_TLSGD) + off += size / 8; + if (off == got_indx * (size / 8)) + { + if (got_type == GOT_TYPE_TPREL) + return -tp_offset; + else + return -dtp_offset; + } + } + } + gold_unreachable(); +} + +// Return the offset to use for the GOT_INDX'th got entry which is +// for global tls symbol GSYM. +template +int64_t +Target_powerpc::do_tls_offset_for_global( + Symbol* gsym, + unsigned int got_indx) const +{ + if (gsym->type() == elfcpp::STT_TLS) + { + for (Got_type got_type = GOT_TYPE_TLSGD; + got_type <= GOT_TYPE_TPREL; + got_type = Got_type(got_type + 1)) + if (gsym->has_got_offset(got_type)) + { + unsigned int off = gsym->got_offset(got_type); + if (got_type == GOT_TYPE_TLSGD) + off += size / 8; + if (off == got_indx * (size / 8)) + { + if (got_type == GOT_TYPE_TPREL) + return -tp_offset; + else + return -dtp_offset; + } + } + } + gold_unreachable(); } // The selector for powerpc object files. @@ -1986,34 +7294,18 @@ class Target_selector_powerpc : public Target_selector { public: Target_selector_powerpc() - : Target_selector(elfcpp::EM_NONE, size, big_endian, - (size == 64 ? - (big_endian ? "elf64-powerpc" : "elf64-powerpcle") : - (big_endian ? "elf32-powerpc" : "elf32-powerpcle"))) + : 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"))) { } - Target* do_recognize(int amachine, int, int) - { - switch (size) - { - case 64: - if (amachine != elfcpp::EM_PPC64) - return NULL; - break; - - case 32: - if (amachine != elfcpp::EM_PPC) - return NULL; - break; - - default: - return NULL; - } - - return this->instantiate_target(); - } - - Target* do_instantiate_target() + virtual Target* + do_instantiate_target() { return new Target_powerpc(); } }; @@ -2022,4 +7314,14 @@ 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 +const int Output_data_glink::pltresolve_size; +template +const typename Stub_table::Address + Stub_table::invalid_address; +template +const typename Target_powerpc::Address + Target_powerpc::invalid_address; + } // End anonymous namespace.