--- /dev/null
+// 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.
projects / binutils-gdb.git / commitdiff