diff options
Diffstat (limited to 'gold/powerpc.cc')
| -rw-r--r-- | gold/powerpc.cc | 1982 |
1 files changed, 1982 insertions, 0 deletions
diff --git a/gold/powerpc.cc b/gold/powerpc.cc new file mode 100644 index 0000000..2fc2ed8 --- /dev/null +++ b/gold/powerpc.cc @@ -0,0 +1,1982 @@ +// powerpc.cc -- powerpc target support for gold. + +// Copyright 2008 Free Software Foundation, Inc. +// Written by David S. Miller <davem@davemloft.net> +// and David Edelsohn <edelsohn@gnu.org> + +// This file is part of gold. + +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 3 of the License, or +// (at your option) any later version. + +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, +// MA 02110-1301, USA. + +#include "gold.h" + +#include "elfcpp.h" +#include "parameters.h" +#include "reloc.h" +#include "powerpc.h" +#include "object.h" +#include "symtab.h" +#include "layout.h" +#include "output.h" +#include "copy-relocs.h" +#include "target.h" +#include "target-reloc.h" +#include "target-select.h" +#include "tls.h" +#include "errors.h" + +namespace +{ + +using namespace gold; + +template<int size, bool big_endian> +class Output_data_plt_powerpc; + +template<int size, bool big_endian> +class Target_powerpc : public Sized_target<size, big_endian> +{ + public: + typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section; + + Target_powerpc() + : Sized_target<size, big_endian>(&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) + { + } + + // Scan the relocations to look for symbol adjustments. + void + scan_relocs(const General_options& options, + Symbol_table* symtab, + Layout* layout, + Sized_relobj<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols); + // Finalize the sections. + void + do_finalize_sections(Layout*); + + // Return the value to use for a dynamic which requires special + // treatment. + uint64_t + do_dynsym_value(const Symbol*) const; + + // Relocate a section. + void + relocate_section(const Relocate_info<size, big_endian>*, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr view_address, + section_size_type view_size); + + // Scan the relocs during a relocatable link. + void + scan_relocatable_relocs(const General_options& options, + Symbol_table* symtab, + Layout* layout, + Sized_relobj<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols, + Relocatable_relocs*); + + // Relocate a section during a relocatable link. + void + relocate_for_relocatable(const Relocate_info<size, big_endian>*, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + off_t offset_in_output_section, + const Relocatable_relocs*, + unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr view_address, + section_size_type view_size, + unsigned char* reloc_view, + section_size_type reloc_view_size); + + // Return whether SYM is defined by the ABI. + bool + do_is_defined_by_abi(Symbol* sym) const + { + return strcmp(sym->name(), "___tls_get_addr") == 0; + } + + // Return the size of the GOT section. + section_size_type + got_size() + { + gold_assert(this->got_ != NULL); + return this->got_->data_size(); + } + + private: + + // The class which scans relocations. + class Scan + { + public: + Scan() + : issued_non_pic_error_(false) + { } + + inline void + local(const General_options& options, Symbol_table* symtab, + Layout* layout, Target_powerpc* target, + Sized_relobj<size, big_endian>* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, + const elfcpp::Sym<size, big_endian>& lsym); + + inline void + global(const General_options& options, Symbol_table* symtab, + Layout* layout, Target_powerpc* target, + Sized_relobj<size, big_endian>* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, + Symbol* gsym); + + private: + static void + unsupported_reloc_local(Sized_relobj<size, big_endian>*, + unsigned int r_type); + + static void + unsupported_reloc_global(Sized_relobj<size, big_endian>*, + unsigned int r_type, Symbol*); + + static void + generate_tls_call(Symbol_table* symtab, Layout* layout, + Target_powerpc* target); + + void + check_non_pic(Relobj*, unsigned int r_type); + + // Whether we have issued an error about a non-PIC compilation. + bool issued_non_pic_error_; + }; + + // The class which implements relocation. + class Relocate + { + public: + // Do a relocation. Return false if the caller should not issue + // any warnings about this relocation. + inline bool + relocate(const Relocate_info<size, big_endian>*, Target_powerpc*, + size_t relnum, const elfcpp::Rela<size, big_endian>&, + unsigned int r_type, const Sized_symbol<size>*, + const Symbol_value<size>*, + unsigned char*, + typename elfcpp::Elf_types<size>::Elf_Addr, + section_size_type); + + private: + // Do a TLS relocation. + inline void + relocate_tls(const Relocate_info<size, big_endian>*, + Target_powerpc* target, + size_t relnum, const elfcpp::Rela<size, big_endian>&, + unsigned int r_type, const Sized_symbol<size>*, + const Symbol_value<size>*, + unsigned char*, + typename elfcpp::Elf_types<size>::Elf_Addr, + section_size_type); + }; + + // A class which returns the size required for a relocation type, + // used while scanning relocs during a relocatable link. + class Relocatable_size_for_reloc + { + public: + unsigned int + get_size_for_reloc(unsigned int, Relobj*); + }; + + // Get the GOT section, creating it if necessary. + Output_data_got<size, big_endian>* + got_section(Symbol_table*, Layout*); + + Output_data_space* + got2_section() const + { + gold_assert (this->got2_ != NULL); + return this->got2_; + } + + // Get the TOC section. + Output_data_space* + toc_section() const + { + gold_assert (this->toc_ != NULL); + return this->toc_; + } + + // 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. + unsigned int + got_mod_index_entry(Symbol_table* symtab, Layout* layout, + Sized_relobj<size, big_endian>* object); + + // Get the PLT section. + const Output_data_plt_powerpc<size, big_endian>* + plt_section() const + { + gold_assert(this->plt_ != NULL); + return this->plt_; + } + + // Get the dynamic reloc section, creating it if necessary. + Reloc_section* + rela_dyn_section(Layout*); + + // Return true if the symbol may need a COPY relocation. + // References from an executable object to non-function symbols + // defined in a dynamic object may need a COPY relocation. + bool + may_need_copy_reloc(Symbol* gsym) + { + return (!parameters->options().shared() + && gsym->is_from_dynobj() + && gsym->type() != elfcpp::STT_FUNC); + } + + // Copy a relocation against a global symbol. + void + copy_reloc(Symbol_table* symtab, Layout* layout, Relobj* object, + unsigned int shndx, Output_section* output_section, + Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) + { + this->copy_relocs_.copy_reloc(symtab, layout, + symtab->get_sized_symbol<size>(sym), + object, shndx, output_section, + reloc, this->rela_dyn_section(layout)); + } + + // Information about this specific target which we pass to the + // general Target structure. + static Target::Target_info powerpc_info; + + // The types of GOT entries needed for this platform. + 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 + }; + + // The GOT section. + Output_data_got<size, big_endian>* got_; + // The GOT2 section. + Output_data_space* got2_; + // The TOC section. + Output_data_space* toc_; + // The PLT section. + Output_data_plt_powerpc<size, big_endian>* plt_; + // The dynamic reloc section. + Reloc_section* rela_dyn_; + // Relocs saved to avoid a COPY reloc. + Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; + // 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_; +}; + +template<> +Target::Target_info Target_powerpc<32, true>::powerpc_info = +{ + 32, // size + true, // is_big_endian + elfcpp::EM_PPC, // machine_code + false, // has_make_symbol + false, // has_resolve + false, // has_code_fill + true, // is_default_stack_executable + '\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) +}; + +template<> +Target::Target_info Target_powerpc<32, false>::powerpc_info = +{ + 32, // size + false, // is_big_endian + elfcpp::EM_PPC, // machine_code + false, // has_make_symbol + false, // has_resolve + false, // has_code_fill + true, // is_default_stack_executable + '\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) +}; + +template<> +Target::Target_info Target_powerpc<64, true>::powerpc_info = +{ + 64, // size + true, // is_big_endian + elfcpp::EM_PPC64, // machine_code + false, // has_make_symbol + false, // has_resolve + false, // has_code_fill + true, // is_default_stack_executable + '\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) +}; + +template<> +Target::Target_info Target_powerpc<64, false>::powerpc_info = +{ + 64, // size + false, // is_big_endian + elfcpp::EM_PPC64, // machine_code + false, // has_make_symbol + false, // has_resolve + false, // has_code_fill + true, // is_default_stack_executable + '\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) +}; + +template<int size, bool big_endian> +class Powerpc_relocate_functions +{ +private: + // Do a simple relocation with the addend in the relocation. + template<int valsize> + static inline void + rela(unsigned char* view, + unsigned int right_shift, + elfcpp::Elf_Xword dst_mask, + typename elfcpp::Swap<size, big_endian>::Valtype value, + typename elfcpp::Swap<size, big_endian>::Valtype addend) + { + typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); + Valtype reloc = ((value + addend) >> right_shift); + + val &= ~dst_mask; + reloc &= dst_mask; + + elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); + } + + // Do a simple relocation using a symbol value with the addend in + // the relocation. + template<int valsize> + static inline void + rela(unsigned char* view, + unsigned int right_shift, + elfcpp::Elf_Xword dst_mask, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Swap<valsize, big_endian>::Valtype addend) + { + typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); + Valtype reloc = (psymval->value(object, addend) >> right_shift); + + val &= ~dst_mask; + reloc &= dst_mask; + + elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); + } + + // Do a simple relocation using a symbol value with the addend in + // the relocation, unaligned. + template<int valsize> + static inline void + rela_ua(unsigned char* view, unsigned int right_shift, + elfcpp::Elf_Xword dst_mask, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Swap<size, big_endian>::Valtype addend) + { + typedef typename elfcpp::Swap_unaligned<valsize, + big_endian>::Valtype Valtype; + unsigned char* wv = view; + Valtype val = elfcpp::Swap_unaligned<valsize, big_endian>::readval(wv); + Valtype reloc = (psymval->value(object, addend) >> right_shift); + + val &= ~dst_mask; + reloc &= dst_mask; + + elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, val | reloc); + } + + // Do a simple PC relative relocation with a Symbol_value with the + // addend in the relocation. + template<int valsize> + static inline void + pcrela(unsigned char* view, unsigned int right_shift, + elfcpp::Elf_Xword dst_mask, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Swap<size, big_endian>::Valtype addend, + typename elfcpp::Elf_types<size>::Elf_Addr address) + { + typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); + Valtype reloc = ((psymval->value(object, addend) - address) + >> right_shift); + + val &= ~dst_mask; + reloc &= dst_mask; + + elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); + } + + template<int valsize> + static inline void + pcrela_unaligned(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Swap<size, big_endian>::Valtype addend, + typename elfcpp::Elf_types<size>::Elf_Addr address) + { + typedef typename elfcpp::Swap_unaligned<valsize, + big_endian>::Valtype Valtype; + unsigned char* wv = view; + Valtype reloc = (psymval->value(object, addend) - address); + + elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, reloc); + } + + typedef Powerpc_relocate_functions<size, big_endian> This; + typedef Relocate_functions<size, big_endian> This_reloc; +public: + // R_POWERPC_REL32: (Symbol + Addend - Address) + static inline void + rel32(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend, + typename elfcpp::Elf_types<size>::Elf_Addr address) + { This_reloc::pcrela32(view, object, psymval, addend, address); } + + // R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc + static inline void + rel24(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend, + typename elfcpp::Elf_types<size>::Elf_Addr address) + { + This::template pcrela<32>(view, 0, 0x03fffffc, object, + psymval, addend, address); + } + + // R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc + static inline void + rel14(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend, + typename elfcpp::Elf_types<size>::Elf_Addr address) + { + This::template pcrela<32>(view, 0, 0x0000fffc, object, + psymval, addend, address); + } + + // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff + static inline void + addr16(unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr value, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { This_reloc::rela16(view, value, addend); } + + static inline void + addr16(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { This_reloc::rela16(view, object, psymval, addend); } + + // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc + static inline void + addr16_ds(unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr value, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { + This::template rela<16>(view, 0, 0xfffc, value, addend); + } + + // R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff + static inline void + addr16_lo(unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr value, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { This_reloc::rela16(view, value, addend); } + + static inline void + addr16_lo(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { This_reloc::rela16(view, object, psymval, addend); } + + // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff + static inline void + addr16_hi(unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr value, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { + This::template rela<16>(view, 16, 0xffff, value, addend); + } + + static inline void + addr16_hi(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { + This::template rela<16>(view, 16, 0xffff, object, psymval, addend); + } + + // 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. + static inline void + addr16_ha(unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr value, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { + typedef typename elfcpp::Swap<16, true>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + Valtype val = elfcpp::Swap<16, true>::readval(wv); + typename elfcpp::Elf_types<size>::Elf_Addr reloc; + + reloc = value + addend; + + if (reloc & 0x8000) + reloc += 0x10000; + reloc >>= 16; + + val &= ~0xffff; + reloc &= 0xffff; + + elfcpp::Swap<16, true>::writeval(wv, val | reloc); + } + + static inline void + addr16_ha(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend) + { + typedef typename elfcpp::Swap<16, true>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + Valtype val = elfcpp::Swap<16, true>::readval(wv); + typename elfcpp::Elf_types<size>::Elf_Addr reloc; + + reloc = psymval->value(object, addend); + + if (reloc & 0x8000) + reloc += 0x10000; + reloc >>= 16; + + val &= ~0xffff; + reloc &= 0xffff; + + elfcpp::Swap<16, true>::writeval(wv, val | reloc); + } + + // R_PPC_REL16: (Symbol + Addend - Address) & 0xffff + static inline void + rel16(unsigned char* view, + const Sized_relobj<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend, + typename elfcpp::Elf_types<size>::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<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend, + typename elfcpp::Elf_types<size>::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<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend, + typename elfcpp::Elf_types<size>::Elf_Addr address) + { + This::template pcrela<16>(view, 16, 0xffff, object, + psymval, addend, address); + } + + // 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<size, big_endian>* object, + const Symbol_value<size>* psymval, + typename elfcpp::Elf_types<size>::Elf_Addr addend, + typename elfcpp::Elf_types<size>::Elf_Addr address) + { + typedef typename elfcpp::Swap<16, true>::Valtype Valtype; + Valtype* wv = reinterpret_cast<Valtype*>(view); + Valtype val = elfcpp::Swap<16, true>::readval(wv); + typename elfcpp::Elf_types<size>::Elf_Addr reloc; + + reloc = (psymval->value(object, addend) - address); + if (reloc & 0x8000) + reloc += 0x10000; + reloc >>= 16; + + val &= ~0xffff; + reloc &= 0xffff; + + elfcpp::Swap<16, true>::writeval(wv, val | reloc); + } +}; + +// Get the GOT section, creating it if necessary. + +template<int size, bool big_endian> +Output_data_got<size, big_endian>* +Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab, + Layout* layout) +{ + if (this->got_ == NULL) + { + gold_assert(symtab != NULL && layout != NULL); + + this->got_ = new Output_data_got<size, big_endian>(); + + layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, + elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, + this->got_); + + // 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_); + } + 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_); + } + + // 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); + } + + return this->got_; +} + +// Get the dynamic reloc section, creating it if necessary. + +template<int size, bool big_endian> +typename Target_powerpc<size, big_endian>::Reloc_section* +Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout) +{ + if (this->rela_dyn_ == NULL) + { + gold_assert(layout != NULL); + this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); + layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, + elfcpp::SHF_ALLOC, this->rela_dyn_); + } + return this->rela_dyn_; +} + +// A class to handle the PLT data. + +template<int size, bool big_endian> +class Output_data_plt_powerpc : public Output_section_data +{ + public: + typedef Output_data_reloc<elfcpp::SHT_RELA, true, + size, big_endian> Reloc_section; + + Output_data_plt_powerpc(Layout*); + + // Add an entry to the PLT. + void add_entry(Symbol* gsym); + + // Return the .rela.plt section data. + const Reloc_section* rel_plt() const + { + return this->rel_; + } + + protected: + void do_adjust_output_section(Output_section* os); + + 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() + { + 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_; +}; + +// Create the PLT section. The ordinary .got section is an argument, +// since we need to refer to the start. + +template<int size, bool big_endian> +Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout) + : Output_section_data(size == 32 ? 4 : 8), count_(0) +{ + this->rel_ = new Reloc_section(false); + layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, + elfcpp::SHF_ALLOC, this->rel_); +} + +template<int size, bool big_endian> +void +Output_data_plt_powerpc<size, big_endian>::do_adjust_output_section(Output_section* os) +{ + os->set_entsize(0); +} + +// Add an entry to the PLT. + +template<int size, bool big_endian> +void +Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym) +{ + gold_assert(!gsym->has_plt_offset()); + unsigned int index = this->count_+ + 4; + section_offset_type plt_offset; + + if (index < 8192) + plt_offset = index * base_plt_entry_size; + 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) */ + + +// Write out the PLT. + +template<int size, bool big_endian> +void +Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of) +{ + const off_t offset = this->offset(); + const section_size_type oview_size = + convert_to_section_size_type(this->data_size()); + unsigned char* const oview = of->get_output_view(offset, oview_size); + unsigned char* pov = oview; + + 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_; + + if (size == 64) + { + for (unsigned int i = 0; i < count; i++) + { + } + } + else + { + for (unsigned int i = 0; i < count; i++) + { + 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 + 0x0b, nop); + pov += base_plt_entry_size; + plt_offset += base_plt_entry_size; + } + } + + gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); + + of->write_output_view(offset, oview_size, oview); +} + +// Create a PLT entry for a global symbol. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab, + Layout* layout, + Symbol* gsym) +{ + if (gsym->has_plt_offset()) + return; + + if (this->plt_ == NULL) + { + // Create the GOT section first. + this->got_section(symtab, layout); + + this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout); + layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, + (elfcpp::SHF_ALLOC + | elfcpp::SHF_EXECINSTR + | elfcpp::SHF_WRITE), + this->plt_); + + // 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); + } + + this->plt_->add_entry(gsym); +} + +// Create a GOT entry for the TLS module index. + +template<int size, bool big_endian> +unsigned int +Target_powerpc<size, big_endian>::got_mod_index_entry(Symbol_table* symtab, + Layout* layout, + Sized_relobj<size, big_endian>* object) +{ + if (this->got_mod_index_offset_ == -1U) + { + gold_assert(symtab != NULL && layout != NULL && object != NULL); + Reloc_section* rela_dyn = this->rela_dyn_section(layout); + Output_data_got<size, big_endian>* got; + unsigned int got_offset; + + got = this->got_section(symtab, layout); + got_offset = got->add_constant(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; + } + return this->got_mod_index_offset_; +} + +// Optimize the TLS relocation type based on what we know about the +// symbol. IS_FINAL is true if the final address of this symbol is +// known at link time. + +static tls::Tls_optimization +optimize_tls_reloc(bool /* is_final */, int r_type) +{ + // If we are generating a shared library, then we can't do anything + // in the linker. + if (parameters->options().shared()) + return tls::TLSOPT_NONE; + switch (r_type) + { + // XXX + default: + gold_unreachable(); + } +} + +// Report an unsupported relocation against a local symbol. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local( + Sized_relobj<size, big_endian>* object, + unsigned int r_type) +{ + gold_error(_("%s: unsupported reloc %u against local symbol"), + object->name().c_str(), r_type); +} + +// We are about to emit a dynamic relocation of type R_TYPE. If the +// dynamic linker does not support it, issue an error. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object, + unsigned int r_type) +{ + gold_assert(r_type != elfcpp::R_POWERPC_NONE); + + // These are the relocation types supported by glibc for both 32-bit + // and 64-bit powerpc. + switch (r_type) + { + case elfcpp::R_POWERPC_RELATIVE: + case elfcpp::R_POWERPC_GLOB_DAT: + case elfcpp::R_POWERPC_DTPMOD: + case elfcpp::R_POWERPC_DTPREL: + case elfcpp::R_POWERPC_TPREL: + case elfcpp::R_POWERPC_JMP_SLOT: + case elfcpp::R_POWERPC_COPY: + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_ADDR24: + case elfcpp::R_POWERPC_REL24: + 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: + case elfcpp::R_PPC64_UADDR64: + case elfcpp::R_POWERPC_UADDR32: + case elfcpp::R_POWERPC_ADDR16: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_PPC64_ADDR16_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: + return; + + default: + break; + } + } + else + { + switch (r_type) + { + // These are the relocation types supported only on 32-bit. + + default: + break; + } + } + + // This prevents us from issuing more than one error per reloc + // section. But we can still wind up issuing more than one + // error per object file. + if (this->issued_non_pic_error_) + return; + object->error(_("requires unsupported dynamic reloc; " + "recompile with -fPIC")); + this->issued_non_pic_error_ = true; + return; +} + +// Scan a relocation for a local symbol. + +template<int size, bool big_endian> +inline void +Target_powerpc<size, big_endian>::Scan::local( + const General_options&, + Symbol_table* symtab, + Layout* layout, + Target_powerpc<size, big_endian>* target, + Sized_relobj<size, big_endian>* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela<size, big_endian>& reloc, + unsigned int r_type, + const elfcpp::Sym<size, big_endian>& lsym) +{ + switch (r_type) + { + case elfcpp::R_POWERPC_NONE: + case elfcpp::R_POWERPC_GNU_VTINHERIT: + case elfcpp::R_POWERPC_GNU_VTENTRY: + break; + + case elfcpp::R_PPC64_ADDR64: + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_ADDR16_HA: + case elfcpp::R_POWERPC_ADDR16_LO: + // 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<size>(reloc.get_r_info()); + rela_dyn->add_local(object, r_sym, r_type, output_section, + data_shndx, reloc.get_r_offset(), + reloc.get_r_addend()); + } + else + { + unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); + gold_assert(lsym.get_st_value() == 0); + rela_dyn->add_local_relative(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_LOCAL24PC: + case elfcpp::R_POWERPC_REL32: + case elfcpp::R_PPC_REL16_LO: + case elfcpp::R_PPC_REL16_HA: + 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_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<size, big_endian>* got; + unsigned int r_sym; + + got = target->got_section(symtab, layout); + r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); + + // 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()) + { + if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)) + { + 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); + } + } + else + got->add_local(object, r_sym, GOT_TYPE_STANDARD); + } + break; + + case elfcpp::R_PPC64_TOC: + // We need a GOT section. + target->got_section(symtab, layout); + 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); + break; + + default: + unsupported_reloc_local(object, r_type); + break; + } +} + +// Report an unsupported relocation against a global symbol. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global( + Sized_relobj<size, big_endian>* object, + unsigned int r_type, + Symbol* gsym) +{ + gold_error(_("%s: unsupported reloc %u against global symbol %s"), + object->name().c_str(), r_type, gsym->demangled_name().c_str()); +} + +// Scan a relocation for a global symbol. + +template<int size, bool big_endian> +inline void +Target_powerpc<size, big_endian>::Scan::global( + const General_options&, + Symbol_table* symtab, + Layout* layout, + Target_powerpc<size, big_endian>* target, + Sized_relobj<size, big_endian>* object, + unsigned int data_shndx, + Output_section* output_section, + const elfcpp::Rela<size, big_endian>& reloc, + unsigned int r_type, + Symbol* gsym) +{ + switch (r_type) + { + case elfcpp::R_POWERPC_NONE: + case elfcpp::R_POWERPC_GNU_VTINHERIT: + case elfcpp::R_POWERPC_GNU_VTENTRY: + 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); + break; + + 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 (target->may_need_copy_reloc(gsym)) + { + 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: + { + if (gsym->needs_plt_entry()) + target->make_plt_entry(symtab, layout, gsym); + // 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 (target->may_need_copy_reloc(gsym)) + { + 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_GOT16: + case elfcpp::R_POWERPC_GOT16_LO: + case elfcpp::R_POWERPC_GOT16_HI: + case elfcpp::R_POWERPC_GOT16_HA: + 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<size, big_endian>* got; + + 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); + + gsym->set_got_offset(GOT_TYPE_STANDARD, off); + rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE, + got, off, 0); + } + } + } + break; + + case elfcpp::R_PPC64_TOC: + // We need a GOT section. + target->got_section(symtab, layout); + break; + + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_TLS: + // XXX TLS + 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); + break; + + default: + unsupported_reloc_global(object, r_type, gsym); + break; + } +} + +// Scan relocations for a section. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::scan_relocs( + const General_options& options, + Symbol_table* symtab, + Layout* layout, + Sized_relobj<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols) +{ + typedef Target_powerpc<size, big_endian> Powerpc; + typedef typename Target_powerpc<size, big_endian>::Scan Scan; + static Output_data_space* sdata; + + if (sh_type == elfcpp::SHT_REL) + { + gold_error(_("%s: unsupported REL reloc section"), + object->name().c_str()); + 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); + 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<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>( + options, + symtab, + layout, + this, + object, + data_shndx, + prelocs, + reloc_count, + output_section, + needs_special_offset_handling, + local_symbol_count, + plocal_symbols); +} + +// Finalize the sections. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::do_finalize_sections(Layout* layout) +{ + // Fill in some more dynamic tags. + Output_data_dynamic* const odyn = layout->dynamic_data(); + if (odyn != NULL) + { + if (this->plt_ != 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_); + } + + if (this->rela_dyn_ != NULL) + { + 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<size>::rela_size); + } + + if (!parameters->options().shared()) + { + // 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); + } + } + + // Emit any relocs we saved in an attempt to avoid generating COPY + // relocs. + if (this->copy_relocs_.any_saved_relocs()) + this->copy_relocs_.emit(this->rela_dyn_section(layout)); +} + +// Perform a relocation. + +template<int size, bool big_endian> +inline bool +Target_powerpc<size, big_endian>::Relocate::relocate( + const Relocate_info<size, big_endian>* relinfo, + Target_powerpc* target, + size_t relnum, + const elfcpp::Rela<size, big_endian>& rela, + unsigned int r_type, + const Sized_symbol<size>* gsym, + const Symbol_value<size>* psymval, + unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr address, + section_size_type /* view_size */) +{ + const unsigned int toc_base_offset = 0x8000; + typedef Powerpc_relocate_functions<size, big_endian> Reloc; + + // Pick the value to use for symbols defined in shared objects. + Symbol_value<size> symval; + if (gsym != NULL + && (gsym->is_from_dynobj() + || (parameters->options().shared() + && (gsym->is_undefined() || gsym->is_preemptible()))) + && gsym->has_plt_offset()) + { + elfcpp::Elf_Xword value; + + value = target->plt_section()->address() + gsym->plt_offset(); + + symval.set_output_value(value); + + psymval = &symval; + } + + const Sized_relobj<size, big_endian>* object = relinfo->object; + elfcpp::Elf_Xword addend = rela.get_r_addend(); + + // 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_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 */ + + 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<size>(rela.get_r_info()); + gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); + got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); + } + have_got_offset = true; + 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) + { + Output_data_space* got2; + got2 = target->got2_section(); + got2_offset = got2->offset(); + addend += got2_offset; + } + have_got_offset = true; + break; + + default: + break; + } + + switch (r_type) + { + case elfcpp::R_POWERPC_NONE: + case elfcpp::R_POWERPC_GNU_VTINHERIT: + case elfcpp::R_POWERPC_GNU_VTENTRY: + break; + + case elfcpp::R_POWERPC_REL32: + Reloc::rel32(view, object, psymval, addend, address); + 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); + break; + + 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<size, big_endian>::rela64(view, object, + psymval, addend); + break; + + case elfcpp::R_POWERPC_ADDR32: + if (!parameters->options().output_is_position_independent()) + Relocate_functions<size, big_endian>::rela32(view, object, + psymval, addend); + break; + + case elfcpp::R_POWERPC_ADDR16_LO: + Reloc::addr16_lo(view, object, psymval, addend); + break; + + case elfcpp::R_POWERPC_ADDR16_HI: + Reloc::addr16_hi(view, object, psymval, addend); + break; + + case elfcpp::R_POWERPC_ADDR16_HA: + Reloc::addr16_ha(view, object, psymval, addend); + break; + + case elfcpp::R_PPC_REL16_LO: + Reloc::rel16_lo(view, object, psymval, addend, address); + break; + + case elfcpp::R_PPC_REL16_HI: + Reloc::rel16_lo(view, object, psymval, addend, address); + break; + + case elfcpp::R_PPC_REL16_HA: + Reloc::rel16_lo(view, object, psymval, addend, address); + break; + + case elfcpp::R_POWERPC_GOT16: + Reloc::addr16(view, got_offset, addend); + break; + + case elfcpp::R_POWERPC_GOT16_LO: + Reloc::addr16_lo(view, got_offset, addend); + break; + + case elfcpp::R_POWERPC_GOT16_HI: + Reloc::addr16_hi(view, got_offset, addend); + break; + + case elfcpp::R_POWERPC_GOT16_HA: + Reloc::addr16_ha(view, got_offset, addend); + break; + + case elfcpp::R_PPC64_TOC16: + Reloc::addr16(view, got_offset, addend); + break; + + case elfcpp::R_PPC64_TOC16_LO: + Reloc::addr16_lo(view, got_offset, addend); + break; + + case elfcpp::R_PPC64_TOC16_HI: + Reloc::addr16_hi(view, got_offset, addend); + break; + + case elfcpp::R_PPC64_TOC16_HA: + Reloc::addr16_ha(view, got_offset, addend); + break; + + case elfcpp::R_PPC64_TOC16_DS: + case elfcpp::R_PPC64_TOC16_LO_DS: + Reloc::addr16_ds(view, got_offset, addend); + 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); + } + 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: + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("unexpected reloc %u in object file"), + r_type); + break; + + default: + gold_error_at_location(relinfo, relnum, rela.get_r_offset(), + _("unsupported reloc %u"), + r_type); + break; + } + + return true; +} + +// Perform a TLS relocation. + +template<int size, bool big_endian> +inline void +Target_powerpc<size, big_endian>::Relocate::relocate_tls( + const Relocate_info<size, big_endian>* relinfo, + Target_powerpc<size, big_endian>* target, + size_t relnum, + const elfcpp::Rela<size, big_endian>& rela, + unsigned int r_type, + const Sized_symbol<size>* gsym, + const Symbol_value<size>* psymval, + unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr address, + section_size_type) +{ + Output_segment* tls_segment = relinfo->layout->tls_segment(); + typedef Powerpc_relocate_functions<size, big_endian> Reloc; + const Sized_relobj<size, big_endian>* object = relinfo->object; + + const elfcpp::Elf_Xword addend = rela.get_r_addend(); + typename elfcpp::Elf_types<size>::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<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::relocate_section( + const Relocate_info<size, big_endian>* relinfo, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr address, + section_size_type view_size) +{ + typedef Target_powerpc<size, big_endian> Powerpc; + typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate; + + gold_assert(sh_type == elfcpp::SHT_RELA); + + gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA, + Powerpc_relocate>( + relinfo, + this, + prelocs, + reloc_count, + output_section, + needs_special_offset_handling, + view, + address, + view_size); +} + +// Return the size of a relocation while scanning during a relocatable +// link. + +template<int size, bool big_endian> +unsigned int +Target_powerpc<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( + unsigned int, + Relobj*) +{ + // We are always SHT_RELA, so we should never get here. + gold_unreachable(); + return 0; +} + +// Scan the relocs during a relocatable link. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::scan_relocatable_relocs( + const General_options& options, + Symbol_table* symtab, + Layout* layout, + Sized_relobj<size, big_endian>* object, + unsigned int data_shndx, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + bool needs_special_offset_handling, + size_t local_symbol_count, + const unsigned char* plocal_symbols, + Relocatable_relocs* rr) +{ + gold_assert(sh_type == elfcpp::SHT_RELA); + + typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, + Relocatable_size_for_reloc> Scan_relocatable_relocs; + + gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, + Scan_relocatable_relocs>( + options, + symtab, + layout, + object, + data_shndx, + prelocs, + reloc_count, + output_section, + needs_special_offset_handling, + local_symbol_count, + plocal_symbols, + rr); +} + +// Relocate a section during a relocatable link. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::relocate_for_relocatable( + const Relocate_info<size, big_endian>* relinfo, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section* output_section, + off_t offset_in_output_section, + const Relocatable_relocs* rr, + unsigned char* view, + typename elfcpp::Elf_types<size>::Elf_Addr view_address, + section_size_type view_size, + unsigned char* reloc_view, + section_size_type reloc_view_size) +{ + gold_assert(sh_type == elfcpp::SHT_RELA); + + gold::relocate_for_relocatable<size, big_endian, elfcpp::SHT_RELA>( + relinfo, + prelocs, + reloc_count, + output_section, + offset_in_output_section, + rr, + view, + view_address, + view_size, + reloc_view, + reloc_view_size); +} + +// Return the value to use for a dynamic which requires special +// treatment. This is how we support equality comparisons of function +// pointers across shared library boundaries, as described in the +// processor specific ABI supplement. + +template<int size, bool big_endian> +uint64_t +Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const +{ + gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); + return this->plt_section()->address() + gsym->plt_offset(); +} + +// The selector for powerpc object files. + +template<int size, bool big_endian> +class Target_selector_powerpc : public Target_selector +{ +public: + Target_selector_powerpc() + : Target_selector(elfcpp::EM_NONE, size, big_endian, + (size == 64 ? + (big_endian ? "elf64-powerpc" : "elf64-powerpcle") : + (big_endian ? "elf32-powerpc" : "elf32-powerpcle"))) + { } + + Target* instantiated_target_; + + Target* do_recognize(int machine, int, int) + { + switch (size) + { + case 64: + if (machine != elfcpp::EM_PPC64) + return NULL; + break; + + case 32: + if (machine != elfcpp::EM_PPC) + return NULL; + break; + + default: + return NULL; + } + + return do_instantiate_target(); + } + + Target* do_instantiate_target() + { + if (this->instantiated_target_ == NULL) + this->instantiated_target_ = new Target_powerpc<size, big_endian>(); + return this->instantiated_target_; + } +}; + +Target_selector_powerpc<32, true> target_selector_ppc32; +Target_selector_powerpc<32, false> target_selector_ppc32le; +Target_selector_powerpc<64, true> target_selector_ppc64; +Target_selector_powerpc<64, false> target_selector_ppc64le; + +} // End anonymous namespace. |