--- /dev/null
+// s390.cc -- s390 target support for gold.
+
+// Copyright (C) 2015 Free Software Foundation, Inc.
+// Written by Marcin Kościelnicki <koriakin@0x04.net>.
+
+// 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 <cstring>
+
+#include "elfcpp.h"
+#include "dwarf.h"
+#include "parameters.h"
+#include "reloc.h"
+#include "s390.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 "gc.h"
+#include "icf.h"
+
+namespace
+{
+
+using namespace gold;
+
+// A class to handle the .got.plt section.
+
+template<int size>
+class Output_data_got_plt_s390 : public Output_section_data_build
+{
+ public:
+ Output_data_got_plt_s390(Layout* layout)
+ : Output_section_data_build(size/8),
+ layout_(layout)
+ { }
+
+ Output_data_got_plt_s390(Layout* layout, off_t data_size)
+ : Output_section_data_build(data_size, size/8),
+ layout_(layout)
+ { }
+
+ protected:
+ // Write out the PLT data.
+ void
+ do_write(Output_file*);
+
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, "** GOT PLT"); }
+
+ private:
+ // A pointer to the Layout class, so that we can find the .dynamic
+ // section when we write out the GOT PLT section.
+ Layout* layout_;
+};
+
+// A class to handle the PLT data.
+
+template<int size>
+class Output_data_plt_s390 : public Output_section_data
+{
+ public:
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, true>
+ Reloc_section;
+
+ Output_data_plt_s390(Layout* layout,
+ Output_data_got<size, true>* got,
+ Output_data_got_plt_s390<size>* got_plt,
+ Output_data_space* got_irelative)
+ : Output_section_data(4), layout_(layout),
+ irelative_rel_(NULL), got_(got), got_plt_(got_plt),
+ got_irelative_(got_irelative), count_(0),
+ irelative_count_(0), free_list_()
+ { this->init(layout); }
+
+ Output_data_plt_s390(Layout* layout,
+ Output_data_got<size, true>* got,
+ Output_data_got_plt_s390<size>* got_plt,
+ Output_data_space* got_irelative,
+ unsigned int plt_count)
+ : Output_section_data((plt_count + 1) * plt_entry_size,
+ 4, false),
+ layout_(layout), irelative_rel_(NULL), got_(got),
+ got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
+ irelative_count_(0), free_list_()
+ {
+ this->init(layout);
+
+ // Initialize the free list and reserve the first entry.
+ this->free_list_.init((plt_count + 1) * plt_entry_size, false);
+ this->free_list_.remove(0, plt_entry_size);
+ }
+
+ // Initialize the PLT section.
+ void
+ init(Layout* layout);
+
+ // Add an entry to the PLT.
+ void
+ add_entry(Symbol_table*, Layout*, Symbol* gsym);
+
+ // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
+ unsigned int
+ add_local_ifunc_entry(Symbol_table*, Layout*,
+ Sized_relobj_file<size, true>*, unsigned int);
+
+ // Add the relocation for a PLT entry.
+ void
+ add_relocation(Symbol_table*, Layout*, Symbol*, unsigned int);
+
+ // Return the .rela.plt section data.
+ Reloc_section*
+ rela_plt()
+ { return this->rel_; }
+
+ // Return where the IRELATIVE relocations should go in the PLT
+ // relocations.
+ Reloc_section*
+ rela_irelative(Symbol_table*, Layout*);
+
+ // Return whether we created a section for IRELATIVE relocations.
+ bool
+ has_irelative_section() const
+ { return this->irelative_rel_ != NULL; }
+
+ // Return the number of PLT entries.
+ unsigned int
+ entry_count() const
+ { return this->count_ + this->irelative_count_; }
+
+ // Return the offset of the first non-reserved PLT entry.
+ unsigned int
+ first_plt_entry_offset()
+ { return plt_entry_size; }
+
+ // Return the size of a PLT entry.
+ unsigned int
+ get_plt_entry_size() const
+ { return plt_entry_size; }
+
+ // Reserve a slot in the PLT for an existing symbol in an incremental update.
+ void
+ reserve_slot(unsigned int plt_index)
+ {
+ this->free_list_.remove((plt_index + 1) * plt_entry_size,
+ (plt_index + 2) * plt_entry_size);
+ }
+
+ // Return the PLT address to use for a global symbol.
+ uint64_t
+ address_for_global(const Symbol*);
+
+ // Return the PLT address to use for a local symbol.
+ uint64_t
+ address_for_local(const Relobj*, unsigned int symndx);
+
+ // Add .eh_frame information for the PLT.
+ void
+ add_eh_frame(Layout* layout)
+ {
+ (void)layout;
+ layout->add_eh_frame_for_plt(this,
+ plt_eh_frame_cie,
+ plt_eh_frame_cie_size,
+ plt_eh_frame_fde,
+ plt_eh_frame_fde_size);
+ }
+
+ protected:
+ // Fill in the first PLT entry.
+ void
+ fill_first_plt_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address);
+
+ // Fill in a normal PLT entry. Returns the offset into the entry that
+ // should be the initial GOT slot value.
+ unsigned int
+ fill_plt_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset);
+
+ void
+ do_adjust_output_section(Output_section* os);
+
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** PLT")); }
+
+ private:
+ // Set the final size.
+ void
+ set_final_data_size();
+
+ // Write out the PLT data.
+ void
+ do_write(Output_file*);
+
+ // A pointer to the Layout class, so that we can find the .dynamic
+ // section when we write out the GOT PLT section.
+ Layout* layout_;
+ // The reloc section.
+ Reloc_section* rel_;
+ // The IRELATIVE relocs, if necessary. These must follow the
+ // regular PLT relocations.
+ Reloc_section* irelative_rel_;
+ // The .got section.
+ Output_data_got<size, true>* got_;
+ // The .got.plt section.
+ Output_data_got_plt_s390<size>* got_plt_;
+ // The part of the .got.plt section used for IRELATIVE relocs.
+ Output_data_space* got_irelative_;
+ // The number of PLT entries.
+ unsigned int count_;
+ // Number of PLT entries with R_TILEGX_IRELATIVE relocs. These
+ // follow the regular PLT entries.
+ unsigned int irelative_count_;
+ // List of available regions within the section, for incremental
+ // update links.
+ Free_list free_list_;
+
+ // The size of an entry in the PLT.
+ static const int plt_entry_size = 0x20;
+ // The first entry in the PLT.
+ static const unsigned char first_plt_entry_32_abs[plt_entry_size];
+ static const unsigned char first_plt_entry_32_pic[plt_entry_size];
+ static const unsigned char first_plt_entry_64[plt_entry_size];
+ // Other entries in the PLT for an executable.
+ static const unsigned char plt_entry_32_abs[plt_entry_size];
+ static const unsigned char plt_entry_32_pic12[plt_entry_size];
+ static const unsigned char plt_entry_32_pic16[plt_entry_size];
+ static const unsigned char plt_entry_32_pic[plt_entry_size];
+ static const unsigned char plt_entry_64[plt_entry_size];
+
+ // The .eh_frame unwind information for the PLT.
+ static const int plt_eh_frame_cie_size = 12;
+ static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
+ static const int plt_eh_frame_fde_size = 12;
+ static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
+};
+
+
+template<int size>
+class Target_s390 : public Sized_target<size, true>
+{
+ public:
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, true> Reloc_section;
+
+ Target_s390()
+ : Sized_target<size, true>(&s390_info),
+ got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
+ global_offset_table_(NULL), rela_dyn_(NULL),
+ rela_irelative_(NULL), copy_relocs_(elfcpp::R_390_COPY),
+ got_mod_index_offset_(-1U), tls_base_symbol_defined_(false),
+ layout_(NULL)
+ { }
+
+ // Scan the relocations to look for symbol adjustments.
+ void
+ gc_process_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, true>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_symbols);
+
+ // Scan the relocations to look for symbol adjustments.
+ void
+ scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, true>* 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*, const Input_objects*, Symbol_table*);
+
+ // Return the value to use for a dynamic which requires special
+ // treatment.
+ uint64_t
+ do_dynsym_value(const Symbol*) const;
+
+ // Relocate a section.
+ void
+ relocate_section(const Relocate_info<size, true>*,
+ 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,
+ const Reloc_symbol_changes*);
+
+ // Scan the relocs during a relocatable link.
+ void
+ scan_relocatable_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, true>* 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*);
+
+ // Return a string used to fill a code section with nops.
+ std::string
+ do_code_fill(section_size_type length) const;
+
+ // Emit relocations for a section.
+ void
+ relocate_relocs(
+ const Relocate_info<size, true>*,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
+ const Relocatable_relocs*,
+ unsigned char* 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(const Symbol* sym) const
+ { return strcmp(sym->name(), "__tls_get_offset") == 0; }
+
+ // Return the PLT address to use for a global symbol.
+ uint64_t
+ do_plt_address_for_global(const Symbol* gsym) const
+ { return this->plt_section()->address_for_global(gsym); }
+
+ uint64_t
+ do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
+ { return this->plt_section()->address_for_local(relobj, symndx); }
+
+ // Return the offset to use for the GOT_INDX'th got entry which is
+ // for a local tls symbol specified by OBJECT, SYMNDX.
+ int64_t
+ do_tls_offset_for_local(const Relobj* object,
+ unsigned int symndx,
+ unsigned int got_indx) const;
+
+ // Return the offset to use for the GOT_INDX'th got entry which is
+ // for global tls symbol GSYM.
+ int64_t
+ do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const;
+
+ // This function should be defined in targets that can use relocation
+ // types to determine (implemented in local_reloc_may_be_function_pointer
+ // and global_reloc_may_be_function_pointer)
+ // if a function's pointer is taken. ICF uses this in safe mode to only
+ // fold those functions whose pointer is defintely not taken.
+ bool
+ do_can_check_for_function_pointers() const
+ { return true; }
+
+ // Return the size of the GOT section.
+ section_size_type
+ got_size() const
+ {
+ gold_assert(this->got_ != NULL);
+ return this->got_->data_size();
+ }
+
+ // Return the number of entries in the GOT.
+ unsigned int
+ got_entry_count() const
+ {
+ if (this->got_ == NULL)
+ return 0;
+ return this->got_size() / (size / 8);
+ }
+
+ // Return the number of entries in the PLT.
+ unsigned int
+ plt_entry_count() const;
+
+ // Return the offset of the first non-reserved PLT entry.
+ unsigned int
+ first_plt_entry_offset() const;
+
+ // Return the size of each PLT entry.
+ unsigned int
+ plt_entry_size() const;
+
+ // Create the GOT section for an incremental update.
+ Output_data_got_base*
+ init_got_plt_for_update(Symbol_table* symtab,
+ Layout* layout,
+ unsigned int got_count,
+ unsigned int plt_count);
+
+ // Reserve a GOT entry for a local symbol, and regenerate any
+ // necessary dynamic relocations.
+ void
+ reserve_local_got_entry(unsigned int got_index,
+ Sized_relobj<size, true>* obj,
+ unsigned int r_sym,
+ unsigned int got_type);
+
+ // Reserve a GOT entry for a global symbol, and regenerate any
+ // necessary dynamic relocations.
+ void
+ reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
+ unsigned int got_type);
+
+ // Register an existing PLT entry for a global symbol.
+ void
+ register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
+ Symbol* gsym);
+
+ // Force a COPY relocation for a given symbol.
+ void
+ emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
+
+ // Apply an incremental relocation.
+ void
+ apply_relocation(const Relocate_info<size, true>* relinfo,
+ typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
+ unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
+ const Symbol* gsym,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
+ section_size_type view_size);
+
+ private:
+
+ // The class which scans relocations.
+ class Scan
+ {
+ public:
+ Scan()
+ : issued_non_pic_error_(false)
+ { }
+
+ static inline int
+ get_reference_flags(unsigned int r_type);
+
+ inline void
+ local(Symbol_table* symtab, Layout* layout, Target_s390* target,
+ Sized_relobj_file<size, true>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, true>& reloc, unsigned int r_type,
+ const elfcpp::Sym<size, true>& lsym,
+ bool is_discarded);
+
+ inline void
+ global(Symbol_table* symtab, Layout* layout, Target_s390* target,
+ Sized_relobj_file<size, true>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, true>& reloc, unsigned int r_type,
+ Symbol* gsym);
+
+ inline bool
+ local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
+ Target_s390* target,
+ Sized_relobj_file<size, true>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, true>& reloc,
+ unsigned int r_type,
+ const elfcpp::Sym<size, true>& lsym);
+
+ inline bool
+ global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
+ Target_s390* target,
+ Sized_relobj_file<size, true>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, true>& reloc,
+ unsigned int r_type,
+ Symbol* gsym);
+
+ private:
+ static void
+ unsupported_reloc_local(Sized_relobj_file<size, true>*,
+ unsigned int r_type);
+
+ static void
+ unsupported_reloc_global(Sized_relobj_file<size, true>*,
+ unsigned int r_type, Symbol*);
+
+ void
+ check_non_pic(Relobj*, unsigned int r_type);
+
+ inline bool
+ possible_function_pointer_reloc(unsigned int r_type);
+
+ bool
+ reloc_needs_plt_for_ifunc(Sized_relobj_file<size, true>*,
+ 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, true>*, Target_s390*,
+ Output_section*,
+ size_t relnum, const elfcpp::Rela<size, true>&,
+ 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 typename elfcpp::Elf_types<size>::Elf_Addr
+ relocate_tls(const Relocate_info<size, true>*, Target_s390*,
+ size_t relnum, const elfcpp::Rela<size, true>&,
+ unsigned int r_type, const Sized_symbol<size>*,
+ const Symbol_value<size>*,
+ unsigned char*, section_size_type);
+
+ // Do a TLS General-Dynamic to Initial-Exec transition.
+ inline void
+ tls_gd_to_ie(const Relocate_info<size, true>*, size_t relnum,
+ const elfcpp::Rela<size, true>&,
+ unsigned char* view,
+ section_size_type view_size);
+
+ // Do a TLS General-Dynamic to Local-Exec transition.
+ inline void
+ tls_gd_to_le(const Relocate_info<size, true>*, size_t relnum,
+ const elfcpp::Rela<size, true>&,
+ unsigned char* view,
+ section_size_type view_size);
+
+ // Do a TLS Local-Dynamic to Local-Exec transition.
+ inline void
+ tls_ld_to_le(const Relocate_info<size, true>*, size_t relnum,
+ const elfcpp::Rela<size, true>&,
+ unsigned char* view,
+ section_size_type view_size);
+
+ // Do a TLS Initial-Exec to Local-Exec transition.
+ static inline void
+ tls_ie_to_le(const Relocate_info<size, true>*, size_t relnum,
+ const elfcpp::Rela<size, true>&,
+ unsigned char* view,
+ section_size_type view_size);
+ };
+
+ // 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*);
+ };
+
+ // Adjust TLS relocation type based on the options and whether this
+ // is a local symbol.
+ static tls::Tls_optimization
+ optimize_tls_reloc(bool is_final, int r_type);
+
+ // Get the GOT section.
+ const Output_data_got<size, true>*
+ got_section() const
+ {
+ gold_assert(this->got_ != NULL);
+ return this->got_;
+ }
+
+ // Get the GOT section, creating it if necessary.
+ Output_data_got<size, true>*
+ got_section(Symbol_table*, Layout*);
+
+ typename elfcpp::Elf_types<size>::Elf_Addr
+ got_address() const
+ {
+ gold_assert(this->got_ != NULL);
+ return this->got_plt_->address();
+ }
+
+ typename elfcpp::Elf_types<size>::Elf_Addr
+ got_main_offset() const
+ {
+ gold_assert(this->got_ != NULL);
+ return this->got_->address() - this->got_address();
+ }
+
+ // Create the PLT section.
+ void
+ make_plt_section(Symbol_table* symtab, Layout* layout);
+
+ // Create a PLT entry for a global symbol.
+ void
+ make_plt_entry(Symbol_table*, Layout*, Symbol*);
+
+ // Create a PLT entry for a local STT_GNU_IFUNC symbol.
+ void
+ make_local_ifunc_plt_entry(Symbol_table*, Layout*,
+ Sized_relobj_file<size, true>* relobj,
+ unsigned int local_sym_index);
+
+ // Create a GOT entry for the TLS module index.
+ unsigned int
+ got_mod_index_entry(Symbol_table* symtab, Layout* layout,
+ Sized_relobj_file<size, true>* object);
+
+ // Get the PLT section.
+ Output_data_plt_s390<size>*
+ 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*);
+
+ // Get the section to use for IRELATIVE relocations.
+ Reloc_section*
+ rela_irelative_section(Layout*);
+
+ // Add a potential copy relocation.
+ void
+ copy_reloc(Symbol_table* symtab, Layout* layout,
+ Sized_relobj_file<size, true>* object,
+ unsigned int shndx, Output_section* output_section,
+ Symbol* sym, const elfcpp::Rela<size, true>& 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 s390_info;
+
+ // The types of GOT entries needed for this platform.
+ // These values are exposed to the ABI in an incremental link.
+ // Do not renumber existing values without changing the version
+ // number of the .gnu_incremental_inputs section.
+ enum Got_type
+ {
+ GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
+ GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
+ GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
+ };
+
+ // The GOT section.
+ Output_data_got<size, true>* got_;
+ // The PLT section.
+ Output_data_plt_s390<size>* plt_;
+ // The GOT PLT section.
+ Output_data_got_plt_s390<size>* got_plt_;
+ // The GOT section for IRELATIVE relocations.
+ Output_data_space* got_irelative_;
+ // The _GLOBAL_OFFSET_TABLE_ symbol.
+ Symbol* global_offset_table_;
+ // The dynamic reloc section.
+ Reloc_section* rela_dyn_;
+ // The section to use for IRELATIVE relocs.
+ Reloc_section* rela_irelative_;
+ // Relocs saved to avoid a COPY reloc.
+ Copy_relocs<elfcpp::SHT_RELA, size, true> copy_relocs_;
+ // Offset of the GOT entry for the TLS module index.
+ unsigned int got_mod_index_offset_;
+ // True if the _TLS_MODULE_BASE_ symbol has been defined.
+ bool tls_base_symbol_defined_;
+ // For use in do_tls_offset_for_*
+ Layout *layout_;
+};
+
+template<>
+Target::Target_info Target_s390<32>::s390_info =
+{
+ 32, // size
+ true, // is_big_endian
+ elfcpp::EM_S390, // machine_code
+ false, // has_make_symbol
+ false, // has_resolve
+ true, // has_code_fill
+ true, // is_default_stack_executable
+ true, // can_icf_inline_merge_sections
+ '\0', // wrap_char
+ "/lib/ld.so.1", // dynamic_linker
+ 0x00400000, // default_text_segment_address
+ 4 * 1024, // abi_pagesize (overridable by -z max-page-size)
+ 4 * 1024, // common_pagesize (overridable by -z common-page-size)
+ false, // isolate_execinstr
+ 0, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
+};
+
+template<>
+Target::Target_info Target_s390<64>::s390_info =
+{
+ 64, // size
+ true, // is_big_endian
+ elfcpp::EM_S390, // machine_code
+ false, // has_make_symbol
+ false, // has_resolve
+ true, // has_code_fill
+ true, // is_default_stack_executable
+ true, // can_icf_inline_merge_sections
+ '\0', // wrap_char
+ "/lib/ld64.so.1", // dynamic_linker
+ 0x80000000ll, // default_text_segment_address
+ 4 * 1024, // abi_pagesize (overridable by -z max-page-size)
+ 4 * 1024, // common_pagesize (overridable by -z common-page-size)
+ false, // isolate_execinstr
+ 0, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start", // entry_symbol_name
+ 64, // hash_entry_size
+};
+
+template<int size>
+class S390_relocate_functions
+{
+public:
+ enum Overflow_check
+ {
+ CHECK_NONE,
+ CHECK_SIGNED,
+ CHECK_UNSIGNED,
+ CHECK_BITFIELD,
+ CHECK_LOW_INSN,
+ CHECK_HIGH_INSN
+ };
+
+ enum Status
+ {
+ STATUS_OK,
+ STATUS_OVERFLOW
+ };
+
+private:
+ typedef S390_relocate_functions<size> This;
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+
+ template<int valsize>
+ static inline bool
+ has_overflow_signed(Address value)
+ {
+ // limit = 1 << (valsize - 1) without shift count exceeding size of type
+ Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1);
+ limit <<= ((valsize - 1) >> 1);
+ limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1));
+ return value + limit > (limit << 1) - 1;
+ }
+
+ template<int valsize>
+ static inline bool
+ has_overflow_unsigned(Address value)
+ {
+ Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1);
+ limit <<= ((valsize - 1) >> 1);
+ limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1));
+ return value > (limit << 1) - 1;
+ }
+
+ template<int fieldsize>
+ static inline void
+ rela(unsigned char* view, Address mask, Address value)
+ {
+ typedef typename elfcpp::Swap<fieldsize, true>::Valtype Valtype;
+ Valtype* wv = reinterpret_cast<Valtype*>(view);
+ Valtype val = elfcpp::Swap<fieldsize, true>::readval(view);
+ val &= ~mask;
+ value &= mask;
+ elfcpp::Swap<fieldsize, true>::writeval(wv, val | value);
+ }
+
+public:
+ // R_390_12, R_390_GOT12, R_390_GOTPLT12, R_390_GOTIE12
+ static inline Status
+ rela12(unsigned char* view, Address value)
+ {
+ if (This::template has_overflow_unsigned<12>(value))
+ return STATUS_OVERFLOW;
+ This::template rela<16>(view, 0x0fff, value);
+ return STATUS_OK;
+ }
+
+ // R_390_16, R_390_GOT16, R_390_GOTPLT16, R_390_GOTOFF16, R_390_PLTOFF16
+ static inline Status
+ rela16(unsigned char* view, Address value)
+ {
+ if (This::template has_overflow_signed<16>(value))
+ return STATUS_OVERFLOW;
+ This::template rela<16>(view, 0xffff, value);
+ return STATUS_OK;
+ }
+
+ // R_390_20, R_390_GOT20, R_390_GOTPLT20, R_390_GOTIE20
+ static inline Status
+ rela20(unsigned char* view, Address value)
+ {
+ if (This::template has_overflow_signed<20>(value))
+ return STATUS_OVERFLOW;
+ This::template rela<16>(view, 0x0fff, value);
+ This::template rela<16>(view + 2, 0xff00, value >> (12 - 8));
+ return STATUS_OK;
+ }
+
+ // R_390_PC12DBL, R_390_PLT12DBL
+ static inline Status
+ pcrela12dbl(unsigned char* view, Address value, Address address)
+ {
+ value -= address;
+ if ((value & 1) != 0)
+ return STATUS_OVERFLOW;
+ if (This::template has_overflow_signed<13>(value))
+ return STATUS_OVERFLOW;
+ value >>= 1;
+ This::template rela<16>(view, 0x0fff, value);
+ return STATUS_OK;
+ }
+
+ // R_390_PC16DBL, R_390_PLT16DBL
+ static inline Status
+ pcrela16dbl(unsigned char* view, Address value, Address address)
+ {
+ value -= address;
+ if ((value & 1) != 0)
+ return STATUS_OVERFLOW;
+ if (This::template has_overflow_signed<17>(value))
+ return STATUS_OVERFLOW;
+ value >>= 1;
+ This::template rela<16>(view, 0xffff, value);
+ return STATUS_OK;
+ }
+
+ // R_390_PC24DBL, R_390_PLT24DBL
+ static inline Status
+ pcrela24dbl(unsigned char* view, Address value, Address address)
+ {
+ value -= address;
+ if ((value & 1) != 0)
+ return STATUS_OVERFLOW;
+ if (This::template has_overflow_signed<25>(value))
+ return STATUS_OVERFLOW;
+ value >>= 1;
+ // Swap doesn't take 24-bit fields well...
+ This::template rela<8>(view, 0xff, value >> 16);
+ This::template rela<16>(view + 1, 0xffff, value);
+ return STATUS_OK;
+ }
+
+ // R_390_PC32DBL, R_390_PLT32DBL, R_390_GOTPCDBL, R_390_GOTENT, R_390_GOTPLTENT
+ static inline Status
+ pcrela32dbl(unsigned char* view, Address value, Address address)
+ {
+ Address reloc = value - address;
+ if ((reloc & 1) != 0)
+ {
+ gold_warning(_("R_390_PC32DBL target misaligned at %llx"), (long long)address);
+ // Wait for a fix for https://sourceware.org/bugzilla/show_bug.cgi?id=18960
+ // return STATUS_OVERFLOW;
+ }
+ if (This::template has_overflow_signed<33>(reloc))
+ return STATUS_OVERFLOW;
+ reloc >>= 1;
+ if (value < address && size == 32)
+ reloc |= 0x80000000;
+ This::template rela<32>(view, 0xffffffff, reloc);
+ return STATUS_OK;
+ }
+
+};
+
+// Initialize the PLT section.
+
+template<int size>
+void
+Output_data_plt_s390<size>::init(Layout* layout)
+{
+ this->rel_ = new Reloc_section(false);
+ layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
+ elfcpp::SHF_ALLOC, this->rel_,
+ ORDER_DYNAMIC_PLT_RELOCS, false);
+}
+
+template<int size>
+void
+Output_data_plt_s390<size>::do_adjust_output_section(Output_section* os)
+{
+ os->set_entsize(plt_entry_size);
+}
+
+// Add an entry to the PLT.
+
+template<int size>
+void
+Output_data_plt_s390<size>::add_entry(Symbol_table* symtab, Layout* layout,
+ Symbol* gsym)
+{
+ gold_assert(!gsym->has_plt_offset());
+
+ unsigned int plt_index;
+ off_t plt_offset;
+ section_offset_type got_offset;
+
+ unsigned int* pcount;
+ unsigned int offset;
+ unsigned int reserved;
+ Output_section_data_build* got;
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && gsym->can_use_relative_reloc(false))
+ {
+ pcount = &this->irelative_count_;
+ offset = 0;
+ reserved = 0;
+ got = this->got_irelative_;
+ }
+ else
+ {
+ pcount = &this->count_;
+ offset = 1;
+ reserved = 3;
+ got = this->got_plt_;
+ }
+
+ if (!this->is_data_size_valid())
+ {
+ // Note that when setting the PLT offset for a non-IRELATIVE
+ // entry we skip the initial reserved PLT entry.
+ plt_index = *pcount + offset;
+ plt_offset = plt_index * plt_entry_size;
+
+ ++*pcount;
+
+ got_offset = (plt_index - offset + reserved) * size / 8;
+ gold_assert(got_offset == got->current_data_size());
+
+ // Every PLT entry needs a GOT entry which points back to the PLT
+ // entry (this will be changed by the dynamic linker, normally
+ // lazily when the function is called).
+ got->set_current_data_size(got_offset + size / 8);
+ }
+ else
+ {
+ // FIXME: This is probably not correct for IRELATIVE relocs.
+
+ // For incremental updates, find an available slot.
+ plt_offset = this->free_list_.allocate(plt_entry_size,
+ plt_entry_size, 0);
+ if (plt_offset == -1)
+ gold_fallback(_("out of patch space (PLT);"
+ " relink with --incremental-full"));
+
+ // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
+ // can be calculated from the PLT index, adjusting for the three
+ // reserved entries at the beginning of the GOT.
+ plt_index = plt_offset / plt_entry_size - 1;
+ got_offset = (plt_index - offset + reserved) * size / 8;
+ }
+
+ gsym->set_plt_offset(plt_offset);
+
+ // Every PLT entry needs a reloc.
+ this->add_relocation(symtab, layout, gsym, got_offset);
+
+ // Note that we don't need to save the symbol. The contents of the
+ // PLT are independent of which symbols are used. The symbols only
+ // appear in the relocations.
+}
+
+// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
+// the PLT offset.
+
+template<int size>
+unsigned int
+Output_data_plt_s390<size>::add_local_ifunc_entry(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, true>* relobj,
+ unsigned int local_sym_index)
+{
+ unsigned int plt_offset = this->irelative_count_ * plt_entry_size;
+ ++this->irelative_count_;
+
+ section_offset_type got_offset = this->got_irelative_->current_data_size();
+
+ // Every PLT entry needs a GOT entry which points back to the PLT
+ // entry.
+ this->got_irelative_->set_current_data_size(got_offset + size / 8);
+
+ // Every PLT entry needs a reloc.
+ Reloc_section* rela = this->rela_irelative(symtab, layout);
+ rela->add_symbolless_local_addend(relobj, local_sym_index,
+ elfcpp::R_390_IRELATIVE,
+ this->got_irelative_, got_offset, 0);
+
+ return plt_offset;
+}
+
+// Add the relocation for a PLT entry.
+
+template<int size>
+void
+Output_data_plt_s390<size>::add_relocation(Symbol_table* symtab,
+ Layout* layout,
+ Symbol* gsym,
+ unsigned int got_offset)
+{
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && gsym->can_use_relative_reloc(false))
+ {
+ Reloc_section* rela = this->rela_irelative(symtab, layout);
+ rela->add_symbolless_global_addend(gsym, elfcpp::R_390_IRELATIVE,
+ this->got_irelative_, got_offset, 0);
+ }
+ else
+ {
+ gsym->set_needs_dynsym_entry();
+ this->rel_->add_global(gsym, elfcpp::R_390_JMP_SLOT, this->got_plt_,
+ got_offset, 0);
+ }
+}
+
+// Return where the IRELATIVE relocations should go in the PLT. These
+// follow the JUMP_SLOT and the TLSDESC relocations.
+
+template<int size>
+typename Output_data_plt_s390<size>::Reloc_section*
+Output_data_plt_s390<size>::rela_irelative(Symbol_table* symtab,
+ Layout* layout)
+{
+ if (this->irelative_rel_ == NULL)
+ {
+ this->irelative_rel_ = new Reloc_section(false);
+ layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
+ elfcpp::SHF_ALLOC, this->irelative_rel_,
+ ORDER_DYNAMIC_PLT_RELOCS, false);
+ gold_assert(this->irelative_rel_->output_section()
+ == this->rel_->output_section());
+
+ if (parameters->doing_static_link())
+ {
+ // A statically linked executable will only have a .rela.plt
+ // section to hold R_390_IRELATIVE relocs for
+ // STT_GNU_IFUNC symbols. The library will use these
+ // symbols to locate the IRELATIVE relocs at program startup
+ // time.
+ symtab->define_in_output_data("__rela_iplt_start", NULL,
+ Symbol_table::PREDEFINED,
+ this->irelative_rel_, 0, 0,
+ elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ elfcpp::STV_HIDDEN, 0, false, true);
+ symtab->define_in_output_data("__rela_iplt_end", NULL,
+ Symbol_table::PREDEFINED,
+ this->irelative_rel_, 0, 0,
+ elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ elfcpp::STV_HIDDEN, 0, true, true);
+ }
+ }
+ return this->irelative_rel_;
+}
+
+// Return the PLT address to use for a global symbol.
+
+template<int size>
+uint64_t
+Output_data_plt_s390<size>::address_for_global(const Symbol* gsym)
+{
+ uint64_t offset = 0;
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && gsym->can_use_relative_reloc(false))
+ offset = (this->count_ + 1) * plt_entry_size;
+ return this->address() + offset + gsym->plt_offset();
+}
+
+// Return the PLT address to use for a local symbol. These are always
+// IRELATIVE relocs.
+
+template<int size>
+uint64_t
+Output_data_plt_s390<size>::address_for_local(const Relobj* object,
+ unsigned int r_sym)
+{
+ return (this->address()
+ + (this->count_ + 1) * plt_entry_size
+ + object->local_plt_offset(r_sym));
+}
+
+// Set the final size.
+template<int size>
+void
+Output_data_plt_s390<size>::set_final_data_size()
+{
+ unsigned int count = this->count_ + this->irelative_count_;
+ this->set_data_size((count + 1) * plt_entry_size);
+}
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::first_plt_entry_32_abs[plt_entry_size] =
+{
+ 0x50, 0x10, 0xf0, 0x1c, // st %r1, 28(%r15)
+ 0x0d, 0x10, // basr %r1, %r0
+ 0x58, 0x10, 0x10, 0x12, // l %r1, 18(%r1)
+ 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, // mvc 24(4,%r15), 4(%r1)
+ 0x58, 0x10, 0x10, 0x08, // l %r1, 8(%r1)
+ 0x07, 0xf1, // br %r1
+ 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // _GLOBAL_OFFSET_TABLE_ (to fill)
+ 0x00, 0x00, 0x00, 0x00, // padding
+};
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::first_plt_entry_32_pic[plt_entry_size] =
+{
+ 0x50, 0x10, 0xf0, 0x1c, // st %r1, 28(%r15)
+ 0x58, 0x10, 0xc0, 0x04, // l %r1, 4(%r12)
+ 0x50, 0x10, 0xf0, 0x18, // st %r1, 24(%r15)
+ 0x58, 0x10, 0xc0, 0x08, // l %r1, 8(%r12)
+ 0x07, 0xf1, // br %r1
+ 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // padding
+};
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::first_plt_entry_64[plt_entry_size] =
+{
+ 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, // stg %r1, 56(%r15)
+ 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, // larl %r1, _GLOBAL_OFFSET_TABLE_ (to fill)
+ 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, // mvc 48(8,%r15), 8(%r1)
+ 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, // lg %r1, 16(%r1)
+ 0x07, 0xf1, // br %r1
+ 0x07, 0x00, // nopr
+ 0x07, 0x00, // nopr
+ 0x07, 0x00, // nopr
+};
+
+template<int size>
+void
+Output_data_plt_s390<size>::fill_first_plt_entry(
+ unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
+{
+ if (size == 64)
+ {
+ memcpy(pov, first_plt_entry_64, plt_entry_size);
+ S390_relocate_functions<size>::pcrela32dbl(pov + 8, got_address, (plt_address + 6));
+ }
+ else if (!parameters->options().output_is_position_independent())
+ {
+ memcpy(pov, first_plt_entry_32_abs, plt_entry_size);
+ elfcpp::Swap<32, true>::writeval(pov + 24, got_address);
+ }
+ else
+ {
+ memcpy(pov, first_plt_entry_32_pic, plt_entry_size);
+ }
+}
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::plt_entry_32_abs[plt_entry_size] =
+{
+ // first part
+ 0x0d, 0x10, // basr %r1, %r0
+ 0x58, 0x10, 0x10, 0x16, // l %r1, 22(%r1)
+ 0x58, 0x10, 0x10, 0x00, // l %r1, 0(%r1)
+ 0x07, 0xf1, // br %r1
+ // second part
+ 0x0d, 0x10, // basr %r1, %r0
+ 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
+ 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
+ 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // _GLOBAL_OFFSET_TABLE_+sym@gotplt (to fill)
+ 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
+};
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::plt_entry_32_pic12[plt_entry_size] =
+{
+ // first part
+ 0x58, 0x10, 0xc0, 0x00, // l %r1, sym@gotplt(%r12) (to fill)
+ 0x07, 0xf1, // br %r1
+ 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // padding
+ // second part
+ 0x0d, 0x10, // basr %r1, %r0
+ 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
+ 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
+ 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
+};
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::plt_entry_32_pic16[plt_entry_size] =
+{
+ // first part
+ 0xa7, 0x18, 0x00, 0x00, // lhi %r1, sym@gotplt (to fill)
+ 0x58, 0x11, 0xc0, 0x00, // l %r1, 0(%r1, %r12)
+ 0x07, 0xf1, // br %r1
+ 0x00, 0x00, // padding
+ // second part
+ 0x0d, 0x10, // basr %r1, %r0
+ 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
+ 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
+ 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
+};
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::plt_entry_32_pic[plt_entry_size] =
+{
+ // first part
+ 0x0d, 0x10, // basr %r1, %r0
+ 0x58, 0x10, 0x10, 0x16, // l %r1, 22(%r1)
+ 0x58, 0x11, 0xc0, 0x00, // l %r1, 0(%r1, %r12)
+ 0x07, 0xf1, // br %r1
+ // second part
+ 0x0d, 0x10, // basr %r1, %r0
+ 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
+ 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
+ 0x00, 0x00, // padding
+ 0x00, 0x00, 0x00, 0x00, // sym@gotplt (to fill)
+ 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
+};
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::plt_entry_64[plt_entry_size] =
+{
+ // first part
+ 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, // larl %r1, _GLOBAL_OFFSET_TABLE_+off (to fill)
+ 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, // lg %r1, 0(%r1)
+ 0x07, 0xf1, // br %r1
+ // second part
+ 0x0d, 0x10, // basr %r1, %r0
+ 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, // lgf %r1, 12(%r1)
+ 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, // jg first_plt_entry (to fill)
+ 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
+};
+
+template<int size>
+unsigned int
+Output_data_plt_s390<size>::fill_plt_entry(
+ unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset)
+{
+ if (size == 64)
+ {
+ memcpy(pov, plt_entry_64, plt_entry_size);
+ S390_relocate_functions<size>::pcrela32dbl(pov + 2, got_address + got_offset, plt_address + plt_offset);
+ S390_relocate_functions<size>::pcrela32dbl(pov + 24, plt_address, plt_address + plt_offset + 22);
+ }
+ else
+ {
+ if (!parameters->options().output_is_position_independent())
+ {
+ memcpy(pov, plt_entry_32_abs, plt_entry_size);
+ elfcpp::Swap<32, true>::writeval(pov + 24, got_address + got_offset);
+ }
+ else
+ {
+ if (got_offset < 0x1000)
+ {
+ memcpy(pov, plt_entry_32_pic12, plt_entry_size);
+ S390_relocate_functions<size>::rela12(pov + 2, got_offset);
+ }
+ else if (got_offset < 0x8000)
+ {
+ memcpy(pov, plt_entry_32_pic16, plt_entry_size);
+ S390_relocate_functions<size>::rela16(pov + 2, got_offset);
+ }
+ else
+ {
+ memcpy(pov, plt_entry_32_pic, plt_entry_size);
+ elfcpp::Swap<32, true>::writeval(pov + 24, got_offset);
+ }
+ }
+ typename elfcpp::Elf_types<size>::Elf_Addr target = plt_address;
+ if (plt_offset >= 0x10000)
+ {
+ // Would overflow pcrela16dbl - aim at the farthest previous jump
+ // we can reach.
+ if (plt_offset > 0x10000)
+ {
+ // Use the full range of pcrel16dbl.
+ target = plt_address + plt_offset - 0x10000 + 18;
+ }
+ else
+ {
+ // if plt_offset is exactly 0x10000, the above would aim at 18th byte
+ // of first_plt_entry, which doesn't have the jump back like the others.
+ // Aim at the next entry instead.
+ target = plt_address + plt_offset - 0xffe0 + 18;
+ }
+ }
+ S390_relocate_functions<size>::pcrela16dbl(pov + 20, target, plt_address + plt_offset + 18);
+ }
+ elfcpp::Swap<32, true>::writeval(pov + 28, plt_rel_offset);
+ if (size == 64)
+ return 14;
+ else
+ return 12;
+}
+
+// The .eh_frame unwind information for the PLT.
+
+template<>
+const unsigned char
+Output_data_plt_s390<32>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
+{
+ 1, // CIE version.
+ 'z', // Augmentation: augmentation size included.
+ 'R', // Augmentation: FDE encoding included.
+ '\0', // End of augmentation string.
+ 1, // Code alignment factor.
+ 0x7c, // Data alignment factor.
+ 14, // Return address column.
+ 1, // Augmentation size.
+ (elfcpp::DW_EH_PE_pcrel // FDE encoding.
+ | elfcpp::DW_EH_PE_sdata4),
+ elfcpp::DW_CFA_def_cfa, 15, 0x60, // DW_CFA_def_cfa: r15 ofs 0x60.
+};
+
+template<>
+const unsigned char
+Output_data_plt_s390<64>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
+{
+ 1, // CIE version.
+ 'z', // Augmentation: augmentation size included.
+ 'R', // Augmentation: FDE encoding included.
+ '\0', // End of augmentation string.
+ 1, // Code alignment factor.
+ 0x78, // Data alignment factor.
+ 14, // Return address column.
+ 1, // Augmentation size.
+ (elfcpp::DW_EH_PE_pcrel // FDE encoding.
+ | elfcpp::DW_EH_PE_sdata4),
+ elfcpp::DW_CFA_def_cfa, 15, 0xa0, // DW_CFA_def_cfa: r15 ofs 0xa0.
+};
+
+template<int size>
+const unsigned char
+Output_data_plt_s390<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
+{
+ 0, 0, 0, 0, // Replaced with offset to .plt.
+ 0, 0, 0, 0, // Replaced with size of .plt.
+ 0, // Augmentation size.
+ elfcpp::DW_CFA_nop,
+ elfcpp::DW_CFA_nop,
+ elfcpp::DW_CFA_nop
+};
+
+// Write out the PLT. This uses the hand-coded instructions above,
+// and adjusts them as needed.
+
+template<int size>
+void
+Output_data_plt_s390<size>::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);
+
+ const off_t got_file_offset = this->got_plt_->offset();
+ gold_assert(parameters->incremental_update()
+ || (got_file_offset + this->got_plt_->data_size()
+ == this->got_irelative_->offset()));
+ const section_size_type got_size =
+ convert_to_section_size_type(this->got_plt_->data_size()
+ + this->got_irelative_->data_size());
+ unsigned char* const got_view = of->get_output_view(got_file_offset,
+ got_size);
+
+ unsigned char* pov = oview;
+
+ // The base address of the .plt section.
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
+ // The base address of the PLT portion of the .got section,
+ // which is where the GOT pointer will point, and where the
+ // three reserved GOT entries are located.
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address
+ = this->got_plt_->address();
+
+ this->fill_first_plt_entry(pov, got_address, plt_address);
+ pov += this->get_plt_entry_size();
+
+ unsigned char* got_pov = got_view;
+
+ const int rel_size = elfcpp::Elf_sizes<size>::rela_size;
+
+ unsigned int plt_offset = this->get_plt_entry_size();
+ unsigned int plt_rel_offset = 0;
+ unsigned int got_offset = 3 * size / 8;
+ const unsigned int count = this->count_ + this->irelative_count_;
+ // The first three entries in the GOT are reserved, and are written
+ // by Output_data_got_plt_s390::do_write.
+ got_pov += 3 * size / 8;
+
+ for (unsigned int plt_index = 0;
+ plt_index < count;
+ ++plt_index,
+ pov += plt_entry_size,
+ got_pov += size / 8,
+ plt_offset += plt_entry_size,
+ plt_rel_offset += rel_size,
+ got_offset += size / 8)
+ {
+ // Set and adjust the PLT entry itself.
+ unsigned int lazy_offset = this->fill_plt_entry(pov,
+ got_address, plt_address,
+ got_offset, plt_offset,
+ plt_rel_offset);
+
+ // Set the entry in the GOT.
+ elfcpp::Swap<size, true>::writeval(got_pov,
+ plt_address + plt_offset + lazy_offset);
+ }
+
+ gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
+ gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
+
+ of->write_output_view(offset, oview_size, oview);
+ of->write_output_view(got_file_offset, got_size, got_view);
+}
+
+// Get the GOT section, creating it if necessary.
+
+template<int size>
+Output_data_got<size, true>*
+Target_s390<size>::got_section(Symbol_table* symtab, Layout* layout)
+{
+ if (this->got_ == NULL)
+ {
+ gold_assert(symtab != NULL && layout != NULL);
+
+ // When using -z now, we can treat .got as a relro section.
+ // Without -z now, it is modified after program startup by lazy
+ // PLT relocations.
+ bool is_got_relro = parameters->options().now();
+ Output_section_order got_order = (is_got_relro
+ ? ORDER_RELRO_LAST
+ : ORDER_DATA);
+
+ // The old GNU linker creates a .got.plt section. We just
+ // create another set of data in the .got section. Note that we
+ // always create a PLT if we create a GOT, although the PLT
+ // might be empty.
+ this->got_plt_ = new Output_data_got_plt_s390<size>(layout);
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
+ this->got_plt_, got_order, is_got_relro);
+
+ // The first three entries are reserved.
+ this->got_plt_->set_current_data_size(3 * size / 8);
+
+ // If there are any IRELATIVE relocations, they get GOT entries
+ // in .got.plt after the jump slot entries.
+ this->got_irelative_ = new Output_data_space(size / 8, "** GOT IRELATIVE PLT");
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
+ this->got_irelative_,
+ got_order, is_got_relro);
+
+ // Unlike some targets (.e.g x86), S/390 does not use separate .got and
+ // .got.plt sections in output. The output .got section contains both
+ // PLT and non-PLT GOT entries.
+ this->got_ = new Output_data_got<size, true>();
+
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
+ this->got_, got_order, is_got_relro);
+
+ // Define _GLOBAL_OFFSET_TABLE_ at the start of the GOT.
+ this->global_offset_table_ =
+ symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
+ Symbol_table::PREDEFINED,
+ this->got_plt_,
+ 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>
+typename Target_s390<size>::Reloc_section*
+Target_s390<size>::rela_dyn_section(Layout* layout)
+{
+ if (this->rela_dyn_ == NULL)
+ {
+ gold_assert(layout != NULL);
+ this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
+ layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
+ elfcpp::SHF_ALLOC, this->rela_dyn_,
+ ORDER_DYNAMIC_RELOCS, false);
+ }
+ return this->rela_dyn_;
+}
+
+// Get the section to use for IRELATIVE relocs, creating it if
+// necessary. These go in .rela.dyn, but only after all other dynamic
+// relocations. They need to follow the other dynamic relocations so
+// that they can refer to global variables initialized by those
+// relocs.
+
+template<int size>
+typename Target_s390<size>::Reloc_section*
+Target_s390<size>::rela_irelative_section(Layout* layout)
+{
+ if (this->rela_irelative_ == NULL)
+ {
+ // Make sure we have already created the dynamic reloc section.
+ this->rela_dyn_section(layout);
+ this->rela_irelative_ = new Reloc_section(false);
+ layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
+ elfcpp::SHF_ALLOC, this->rela_irelative_,
+ ORDER_DYNAMIC_RELOCS, false);
+ gold_assert(this->rela_dyn_->output_section()
+ == this->rela_irelative_->output_section());
+ }
+ return this->rela_irelative_;
+}
+
+// Write the first three reserved words of the .got.plt section.
+// The remainder of the section is written while writing the PLT
+// in Output_data_plt_s390::do_write.
+
+template<int size>
+void
+Output_data_got_plt_s390<size>::do_write(Output_file* of)
+{
+ // The first entry in the GOT is the address of the .dynamic section
+ // aka the PT_DYNAMIC segment. The next two entries are reserved.
+ // We saved space for them when we created the section in
+ // Target_x86_64::got_section.
+ const off_t got_file_offset = this->offset();
+ gold_assert(this->data_size() >= 3 * size / 8);
+ unsigned char* const got_view =
+ of->get_output_view(got_file_offset, 3 * size / 8);
+ Output_section* dynamic = this->layout_->dynamic_section();
+ uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
+ elfcpp::Swap<size, true>::writeval(got_view, dynamic_addr);
+ memset(got_view + size / 8, 0, 2 * size / 8);
+ of->write_output_view(got_file_offset, 3 * size / 8, got_view);
+}
+
+// Create the PLT section.
+
+template<int size>
+void
+Target_s390<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
+{
+ if (this->plt_ == NULL)
+ {
+ // Create the GOT sections first.
+ this->got_section(symtab, layout);
+
+ // Ensure that .rela.dyn always appears before .rela.plt This is
+ // necessary due to how, on 32-bit S/390 and some other targets,
+ // .rela.dyn needs to include .rela.plt in it's range.
+ this->rela_dyn_section(layout);
+
+ this->plt_ = new Output_data_plt_s390<size>(layout,
+ this->got_, this->got_plt_, this->got_irelative_);
+
+ // Add unwind information if requested.
+ if (parameters->options().ld_generated_unwind_info())
+ this->plt_->add_eh_frame(layout);
+
+ layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_EXECINSTR),
+ this->plt_, ORDER_PLT, false);
+
+ // Make the sh_info field of .rela.plt point to .plt.
+ Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
+ rela_plt_os->set_info_section(this->plt_->output_section());
+ }
+}
+
+// Create a PLT entry for a global symbol.
+
+template<int size>
+void
+Target_s390<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
+ Symbol* gsym)
+{
+ if (gsym->has_plt_offset())
+ return;
+
+ if (this->plt_ == NULL)
+ this->make_plt_section(symtab, layout);
+
+ this->plt_->add_entry(symtab, layout, gsym);
+}
+
+// Make a PLT entry for a local STT_GNU_IFUNC symbol.
+
+template<int size>
+void
+Target_s390<size>::make_local_ifunc_plt_entry(
+ Symbol_table* symtab, Layout* layout,
+ Sized_relobj_file<size, true>* relobj,
+ unsigned int local_sym_index)
+{
+ if (relobj->local_has_plt_offset(local_sym_index))
+ return;
+ if (this->plt_ == NULL)
+ this->make_plt_section(symtab, layout);
+ unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
+ relobj,
+ local_sym_index);
+ relobj->set_local_plt_offset(local_sym_index, plt_offset);
+}
+
+// Return the number of entries in the PLT.
+
+template<int size>
+unsigned int
+Target_s390<size>::plt_entry_count() const
+{
+ if (this->plt_ == NULL)
+ return 0;
+ return this->plt_->entry_count();
+}
+
+// Return the offset of the first non-reserved PLT entry.
+
+template<int size>
+unsigned int
+Target_s390<size>::first_plt_entry_offset() const
+{
+ return this->plt_->first_plt_entry_offset();
+}
+
+// Return the size of each PLT entry.
+
+template<int size>
+unsigned int
+Target_s390<size>::plt_entry_size() const
+{
+ return this->plt_->get_plt_entry_size();
+}
+
+// Create the GOT and PLT sections for an incremental update.
+
+template<int size>
+Output_data_got_base*
+Target_s390<size>::init_got_plt_for_update(Symbol_table* symtab,
+ Layout* layout,
+ unsigned int got_count,
+ unsigned int plt_count)
+{
+ gold_assert(this->got_ == NULL);
+
+ // Add the three reserved entries.
+ this->got_plt_ = new Output_data_got_plt_s390<size>(layout, (plt_count + 3) * size / 8);
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_plt_, ORDER_NON_RELRO_FIRST,
+ false);
+
+ // If there are any IRELATIVE relocations, they get GOT entries in
+ // .got.plt after the jump slot entries.
+ this->got_irelative_ = new Output_data_space(0, size / 8, "** GOT IRELATIVE PLT");
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->got_irelative_,
+ ORDER_NON_RELRO_FIRST, false);
+
+ this->got_ = new Output_data_got<size, true>(got_count * size / 8);
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_, ORDER_RELRO_LAST,
+ true);
+
+ // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
+ this->global_offset_table_ =
+ symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
+ Symbol_table::PREDEFINED,
+ this->got_plt_,
+ 0, 0, elfcpp::STT_OBJECT,
+ elfcpp::STB_LOCAL,
+ elfcpp::STV_HIDDEN, 0,
+ false, false);
+
+ // Create the PLT section.
+ this->plt_ = new Output_data_plt_s390<size>(layout,
+ this->got_, this->got_plt_, this->got_irelative_, plt_count);
+
+ // Add unwind information if requested.
+ if (parameters->options().ld_generated_unwind_info())
+ this->plt_->add_eh_frame(layout);
+
+ layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
+ this->plt_, ORDER_PLT, false);
+
+ // Make the sh_info field of .rela.plt point to .plt.
+ Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
+ rela_plt_os->set_info_section(this->plt_->output_section());
+
+ // Create the rela_dyn section.
+ this->rela_dyn_section(layout);
+
+ return this->got_;
+}
+
+// Reserve a GOT entry for a local symbol, and regenerate any
+// necessary dynamic relocations.
+
+template<int size>
+void
+Target_s390<size>::reserve_local_got_entry(
+ unsigned int got_index,
+ Sized_relobj<size, true>* obj,
+ unsigned int r_sym,
+ unsigned int got_type)
+{
+ unsigned int got_offset = got_index * size / 8;
+ Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
+
+ this->got_->reserve_local(got_index, obj, r_sym, got_type);
+ switch (got_type)
+ {
+ case GOT_TYPE_STANDARD:
+ if (parameters->options().output_is_position_independent())
+ rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_390_RELATIVE,
+ this->got_, got_offset, 0, false);
+ break;
+ case GOT_TYPE_TLS_OFFSET:
+ rela_dyn->add_local(obj, r_sym, elfcpp::R_390_TLS_TPOFF,
+ this->got_, got_offset, 0);
+ break;
+ case GOT_TYPE_TLS_PAIR:
+ this->got_->reserve_slot(got_index + 1);
+ rela_dyn->add_local(obj, r_sym, elfcpp::R_390_TLS_DTPMOD,
+ this->got_, got_offset, 0);
+ break;
+ default:
+ gold_unreachable();
+ }
+}
+
+// Reserve a GOT entry for a global symbol, and regenerate any
+// necessary dynamic relocations.
+
+template<int size>
+void
+Target_s390<size>::reserve_global_got_entry(unsigned int got_index,
+ Symbol* gsym,
+ unsigned int got_type)
+{
+ unsigned int got_offset = got_index * size / 8;
+ Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
+
+ this->got_->reserve_global(got_index, gsym, got_type);
+ switch (got_type)
+ {
+ case GOT_TYPE_STANDARD:
+ if (!gsym->final_value_is_known())
+ {
+ if (gsym->is_from_dynobj()
+ || gsym->is_undefined()
+ || gsym->is_preemptible()
+ || gsym->type() == elfcpp::STT_GNU_IFUNC)
+ rela_dyn->add_global(gsym, elfcpp::R_390_GLOB_DAT,
+ this->got_, got_offset, 0);
+ else
+ rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE,
+ this->got_, got_offset, 0, false);
+ }
+ break;
+ case GOT_TYPE_TLS_OFFSET:
+ rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_TPOFF,
+ this->got_, got_offset, 0, false);
+ break;
+ case GOT_TYPE_TLS_PAIR:
+ this->got_->reserve_slot(got_index + 1);
+ rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_DTPMOD,
+ this->got_, got_offset, 0, false);
+ rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_DTPOFF,
+ this->got_, got_offset + size / 8, 0, false);
+ break;
+ default:
+ gold_unreachable();
+ }
+}
+
+// Register an existing PLT entry for a global symbol.
+
+template<int size>
+void
+Target_s390<size>::register_global_plt_entry(Symbol_table* symtab,
+ Layout* layout,
+ unsigned int plt_index,
+ Symbol* gsym)
+{
+ gold_assert(this->plt_ != NULL);
+ gold_assert(!gsym->has_plt_offset());
+
+ this->plt_->reserve_slot(plt_index);
+
+ gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
+
+ unsigned int got_offset = (plt_index + 3) * size / 8;
+ this->plt_->add_relocation(symtab, layout, gsym, got_offset);
+}
+
+// Force a COPY relocation for a given symbol.
+
+template<int size>
+void
+Target_s390<size>::emit_copy_reloc(
+ Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
+{
+ this->copy_relocs_.emit_copy_reloc(symtab,
+ symtab->get_sized_symbol<size>(sym),
+ os,
+ offset,
+ this->rela_dyn_section(NULL));
+}
+
+// Create a GOT entry for the TLS module index.
+
+template<int size>
+unsigned int
+Target_s390<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
+ Sized_relobj_file<size, true>* 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, true>* got = this->got_section(symtab, layout);
+ unsigned int got_offset = got->add_constant(0);
+ rela_dyn->add_local(object, 0, elfcpp::R_390_TLS_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.
+
+template<int size>
+tls::Tls_optimization
+Target_s390<size>::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)
+ {
+ case elfcpp::R_390_TLS_GD32:
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_GDCALL:
+ // These are General-Dynamic which permits fully general TLS
+ // access. Since we know that we are generating an executable,
+ // we can convert this to Initial-Exec. If we also know that
+ // this is a local symbol, we can further switch to Local-Exec.
+ if (is_final)
+ return tls::TLSOPT_TO_LE;
+ return tls::TLSOPT_TO_IE;
+
+ case elfcpp::R_390_TLS_LDM32:
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_LDO64:
+ case elfcpp::R_390_TLS_LDCALL:
+ // This is Local-Dynamic, which refers to a local symbol in the
+ // dynamic TLS block. Since we know that we generating an
+ // executable, we can switch to Local-Exec.
+ return tls::TLSOPT_TO_LE;
+
+ case elfcpp::R_390_TLS_IE32:
+ case elfcpp::R_390_TLS_IE64:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_LOAD:
+ // These are Initial-Exec relocs which get the thread offset
+ // from the GOT. If we know that we are linking against the
+ // local symbol, we can switch to Local-Exec, which links the
+ // thread offset into the instruction.
+ if (is_final)
+ return tls::TLSOPT_TO_LE;
+ return tls::TLSOPT_NONE;
+
+ case elfcpp::R_390_TLS_GOTIE12:
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_GOTIE20:
+ // These are Initial-Exec, but cannot be optimized.
+ return tls::TLSOPT_NONE;
+
+ case elfcpp::R_390_TLS_LE32:
+ case elfcpp::R_390_TLS_LE64:
+ // When we already have Local-Exec, there is nothing further we
+ // can do.
+ return tls::TLSOPT_NONE;
+
+ default:
+ gold_unreachable();
+ }
+}
+
+// Get the Reference_flags for a particular relocation.
+
+template<int size>
+int
+Target_s390<size>::Scan::get_reference_flags(unsigned int r_type)
+{
+ switch (r_type)
+ {
+ case elfcpp::R_390_NONE:
+ case elfcpp::R_390_GNU_VTINHERIT:
+ case elfcpp::R_390_GNU_VTENTRY:
+ case elfcpp::R_390_GOTPC:
+ case elfcpp::R_390_GOTPCDBL:
+ // No symbol reference.
+ return 0;
+
+ case elfcpp::R_390_64:
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_20:
+ case elfcpp::R_390_16:
+ case elfcpp::R_390_12:
+ case elfcpp::R_390_8:
+ return Symbol::ABSOLUTE_REF;
+
+ case elfcpp::R_390_PC12DBL:
+ case elfcpp::R_390_PC16:
+ case elfcpp::R_390_PC16DBL:
+ case elfcpp::R_390_PC24DBL:
+ case elfcpp::R_390_PC32:
+ case elfcpp::R_390_PC32DBL:
+ case elfcpp::R_390_PC64:
+ case elfcpp::R_390_GOTOFF16:
+ case elfcpp::R_390_GOTOFF32:
+ case elfcpp::R_390_GOTOFF64:
+ return Symbol::RELATIVE_REF;
+
+ case elfcpp::R_390_PLT12DBL:
+ case elfcpp::R_390_PLT16DBL:
+ case elfcpp::R_390_PLT24DBL:
+ case elfcpp::R_390_PLT32:
+ case elfcpp::R_390_PLT32DBL:
+ case elfcpp::R_390_PLT64:
+ case elfcpp::R_390_PLTOFF16:
+ case elfcpp::R_390_PLTOFF32:
+ case elfcpp::R_390_PLTOFF64:
+ return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
+
+ case elfcpp::R_390_GOT12:
+ case elfcpp::R_390_GOT16:
+ case elfcpp::R_390_GOT20:
+ case elfcpp::R_390_GOT32:
+ case elfcpp::R_390_GOT64:
+ case elfcpp::R_390_GOTENT:
+ case elfcpp::R_390_GOTPLT12:
+ case elfcpp::R_390_GOTPLT16:
+ case elfcpp::R_390_GOTPLT20:
+ case elfcpp::R_390_GOTPLT32:
+ case elfcpp::R_390_GOTPLT64:
+ case elfcpp::R_390_GOTPLTENT:
+ // Absolute in GOT.
+ return Symbol::ABSOLUTE_REF;
+
+ case elfcpp::R_390_TLS_GD32: // Global-dynamic
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_GDCALL:
+ case elfcpp::R_390_TLS_LDM32: // Local-dynamic
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_LDO64:
+ case elfcpp::R_390_TLS_LDCALL:
+ case elfcpp::R_390_TLS_IE32: // Initial-exec
+ case elfcpp::R_390_TLS_IE64:
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_GOTIE12:
+ case elfcpp::R_390_TLS_GOTIE20:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_LOAD:
+ case elfcpp::R_390_TLS_LE32: // Local-exec
+ case elfcpp::R_390_TLS_LE64:
+ return Symbol::TLS_REF;
+
+ case elfcpp::R_390_COPY:
+ case elfcpp::R_390_GLOB_DAT:
+ case elfcpp::R_390_JMP_SLOT:
+ case elfcpp::R_390_RELATIVE:
+ case elfcpp::R_390_IRELATIVE:
+ case elfcpp::R_390_TLS_TPOFF:
+ case elfcpp::R_390_TLS_DTPOFF:
+ case elfcpp::R_390_TLS_DTPMOD:
+ default:
+ // Not expected. We will give an error later.
+ return 0;
+ }
+}
+
+// Report an unsupported relocation against a local symbol.
+
+template<int size>
+void
+Target_s390<size>::Scan::unsupported_reloc_local(
+ Sized_relobj_file<size, true>* 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>
+void
+Target_s390<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type)
+{
+ gold_assert(r_type != elfcpp::R_390_NONE);
+
+ if (size == 64)
+ {
+ switch (r_type)
+ {
+ // These are the relocation types supported by glibc for s390 64-bit.
+ case elfcpp::R_390_RELATIVE:
+ case elfcpp::R_390_IRELATIVE:
+ case elfcpp::R_390_COPY:
+ case elfcpp::R_390_GLOB_DAT:
+ case elfcpp::R_390_JMP_SLOT:
+ case elfcpp::R_390_TLS_DTPMOD:
+ case elfcpp::R_390_TLS_DTPOFF:
+ case elfcpp::R_390_TLS_TPOFF:
+ case elfcpp::R_390_8:
+ case elfcpp::R_390_16:
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_64:
+ case elfcpp::R_390_PC16:
+ case elfcpp::R_390_PC16DBL:
+ case elfcpp::R_390_PC32:
+ case elfcpp::R_390_PC32DBL:
+ case elfcpp::R_390_PC64:
+ return;
+
+ default:
+ break;
+ }
+ }
+ else
+ {
+ switch (r_type)
+ {
+ // These are the relocation types supported by glibc for s390 32-bit.
+ case elfcpp::R_390_RELATIVE:
+ case elfcpp::R_390_IRELATIVE:
+ case elfcpp::R_390_COPY:
+ case elfcpp::R_390_GLOB_DAT:
+ case elfcpp::R_390_JMP_SLOT:
+ case elfcpp::R_390_TLS_DTPMOD:
+ case elfcpp::R_390_TLS_DTPOFF:
+ case elfcpp::R_390_TLS_TPOFF:
+ case elfcpp::R_390_8:
+ case elfcpp::R_390_16:
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_PC16:
+ case elfcpp::R_390_PC16DBL:
+ case elfcpp::R_390_PC32:
+ case elfcpp::R_390_PC32DBL:
+ return;
+
+ default:
+ break;
+ }
+ }
+
+ // This prevents us from issuing more than one error per reloc
+ // section. But we can still wind up issuing more than one
+ // error per object file.
+ if (this->issued_non_pic_error_)
+ return;
+ gold_assert(parameters->options().output_is_position_independent());
+ object->error(_("requires unsupported dynamic reloc; "
+ "recompile with -fPIC"));
+ this->issued_non_pic_error_ = true;
+ return;
+}
+
+// Return whether we need to make a PLT entry for a relocation of the
+// given type against a STT_GNU_IFUNC symbol.
+
+template<int size>
+bool
+Target_s390<size>::Scan::reloc_needs_plt_for_ifunc(
+ Sized_relobj_file<size, true>* object,
+ unsigned int r_type)
+{
+ int flags = Scan::get_reference_flags(r_type);
+ if (flags & Symbol::TLS_REF)
+ gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
+ object->name().c_str(), r_type);
+ return flags != 0;
+}
+
+// Scan a relocation for a local symbol.
+
+template<int size>
+inline void
+Target_s390<size>::Scan::local(Symbol_table* symtab,
+ Layout* layout,
+ Target_s390<size>* target,
+ Sized_relobj_file<size, true>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, true>& reloc,
+ unsigned int r_type,
+ const elfcpp::Sym<size, true>& lsym,
+ bool is_discarded)
+{
+ if (is_discarded)
+ return;
+
+ // A local STT_GNU_IFUNC symbol may require a PLT entry.
+ bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
+
+ if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
+ }
+
+ switch (r_type)
+ {
+ case elfcpp::R_390_NONE:
+ case elfcpp::R_390_GNU_VTINHERIT:
+ case elfcpp::R_390_GNU_VTENTRY:
+ break;
+
+ case elfcpp::R_390_64:
+ // If building a shared library (or a position-independent
+ // executable), we need to create a dynamic relocation for this
+ // location. The relocation applied at link time will apply the
+ // link-time value, so we flag the location with an
+ // R_390_RELATIVE relocation so the dynamic loader can
+ // relocate it easily.
+ if (parameters->options().output_is_position_independent() && size == 64)
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_local_relative(object, r_sym,
+ elfcpp::R_390_RELATIVE,
+ output_section, data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend(), is_ifunc);
+ }
+ break;
+
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_20:
+ case elfcpp::R_390_16:
+ case elfcpp::R_390_12:
+ case elfcpp::R_390_8:
+ if (parameters->options().output_is_position_independent())
+ {
+ if (size == 32 && r_type == elfcpp::R_390_32)
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_local_relative(object, r_sym,
+ elfcpp::R_390_RELATIVE,
+ output_section, data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend(), is_ifunc);
+ break;
+ }
+
+ check_non_pic(object, r_type);
+
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ if (lsym.get_st_type() != elfcpp::STT_SECTION)
+ rela_dyn->add_local(object, r_sym, r_type, output_section,
+ data_shndx, reloc.get_r_offset(),
+ reloc.get_r_addend());
+ else
+ {
+ gold_assert(lsym.get_st_value() == 0);
+ unsigned int shndx = lsym.get_st_shndx();
+ bool is_ordinary;
+ shndx = object->adjust_sym_shndx(r_sym, shndx,
+ &is_ordinary);
+ if (!is_ordinary)
+ object->error(_("section symbol %u has bad shndx %u"),
+ r_sym, shndx);
+ else
+ rela_dyn->add_local_section(object, shndx,
+ r_type, output_section,
+ data_shndx, reloc.get_r_offset(),
+ reloc.get_r_addend());
+ }
+ }
+ break;
+
+ case elfcpp::R_390_PC12DBL:
+ case elfcpp::R_390_PC16:
+ case elfcpp::R_390_PC16DBL:
+ case elfcpp::R_390_PC24DBL:
+ case elfcpp::R_390_PC32:
+ case elfcpp::R_390_PC32DBL:
+ case elfcpp::R_390_PC64:
+ break;
+
+ case elfcpp::R_390_PLT12DBL:
+ case elfcpp::R_390_PLT16DBL:
+ case elfcpp::R_390_PLT24DBL:
+ case elfcpp::R_390_PLT32:
+ case elfcpp::R_390_PLT32DBL:
+ case elfcpp::R_390_PLT64:
+ // Since we know this is a local symbol, we can handle this as a
+ // PC32 reloc.
+ break;
+
+ case elfcpp::R_390_GOTPC:
+ case elfcpp::R_390_GOTPCDBL:
+ case elfcpp::R_390_GOTOFF16:
+ case elfcpp::R_390_GOTOFF32:
+ case elfcpp::R_390_GOTOFF64:
+ case elfcpp::R_390_PLTOFF16:
+ case elfcpp::R_390_PLTOFF32:
+ case elfcpp::R_390_PLTOFF64:
+ // We need a GOT section.
+ target->got_section(symtab, layout);
+ // For PLTOFF*, we'd normally want a PLT section, but since we
+ // know this is a local symbol, no PLT is needed.
+ break;
+
+ case elfcpp::R_390_GOT12:
+ case elfcpp::R_390_GOT16:
+ case elfcpp::R_390_GOT20:
+ case elfcpp::R_390_GOT32:
+ case elfcpp::R_390_GOT64:
+ case elfcpp::R_390_GOTENT:
+ case elfcpp::R_390_GOTPLT12:
+ case elfcpp::R_390_GOTPLT16:
+ case elfcpp::R_390_GOTPLT20:
+ case elfcpp::R_390_GOTPLT32:
+ case elfcpp::R_390_GOTPLT64:
+ case elfcpp::R_390_GOTPLTENT:
+ {
+ // The symbol requires a GOT section.
+ Output_data_got<size, true>* got = target->got_section(symtab, layout);
+
+ // The symbol requires a GOT entry.
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+
+ // For a STT_GNU_IFUNC symbol we want the PLT offset. That
+ // lets function pointers compare correctly with shared
+ // libraries. Otherwise we would need an IRELATIVE reloc.
+ bool is_new;
+ if (is_ifunc)
+ is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
+ else
+ is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
+ if (is_new)
+ {
+ // 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())
+ {
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ unsigned int got_offset =
+ object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
+ rela_dyn->add_local_relative(object, r_sym,
+ elfcpp::R_390_RELATIVE,
+ got, got_offset, 0, is_ifunc);
+ }
+ }
+ // For GOTPLT*, we'd normally want a PLT section, but since
+ // we know this is a local symbol, no PLT is needed.
+ }
+ break;
+
+ case elfcpp::R_390_COPY:
+ case elfcpp::R_390_GLOB_DAT:
+ case elfcpp::R_390_JMP_SLOT:
+ case elfcpp::R_390_RELATIVE:
+ case elfcpp::R_390_IRELATIVE:
+ // These are outstanding tls relocs, which are unexpected when linking
+ case elfcpp::R_390_TLS_TPOFF:
+ case elfcpp::R_390_TLS_DTPOFF:
+ case elfcpp::R_390_TLS_DTPMOD:
+ gold_error(_("%s: unexpected reloc %u in object file"),
+ object->name().c_str(), r_type);
+ break;
+
+ // These are initial tls relocs, which are expected when linking
+ case elfcpp::R_390_TLS_GD32: // Global-dynamic
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_GDCALL:
+ case elfcpp::R_390_TLS_LDM32: // Local-dynamic
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_LDO64:
+ case elfcpp::R_390_TLS_LDCALL:
+ case elfcpp::R_390_TLS_IE32: // Initial-exec
+ case elfcpp::R_390_TLS_IE64:
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_GOTIE12:
+ case elfcpp::R_390_TLS_GOTIE20:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_LOAD:
+ case elfcpp::R_390_TLS_LE32: // Local-exec
+ case elfcpp::R_390_TLS_LE64:
+ {
+ bool output_is_shared = parameters->options().shared();
+ const tls::Tls_optimization optimized_type
+ = Target_s390<size>::optimize_tls_reloc(!output_is_shared,
+ r_type);
+ switch (r_type)
+ {
+ case elfcpp::R_390_TLS_GD32: // General-dynamic
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_GDCALL:
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a pair of GOT entries for the module index and
+ // dtv-relative offset.
+ Output_data_got<size, true>* got
+ = target->got_section(symtab, layout);
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ unsigned int shndx = lsym.get_st_shndx();
+ bool is_ordinary;
+ shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
+ if (!is_ordinary)
+ object->error(_("local symbol %u has bad shndx %u"),
+ r_sym, shndx);
+ else
+ got->add_local_pair_with_rel(object, r_sym,
+ shndx,
+ GOT_TYPE_TLS_PAIR,
+ target->rela_dyn_section(layout),
+ elfcpp::R_390_TLS_DTPMOD);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_local(object, r_type);
+ break;
+
+ case elfcpp::R_390_TLS_LDM32: // Local-dynamic
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDCALL:
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a GOT entry for the module index.
+ target->got_mod_index_entry(symtab, layout, object);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_local(object, r_type);
+ break;
+
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_LDO64:
+ break;
+
+ case elfcpp::R_390_TLS_IE32: // Initial-exec
+ case elfcpp::R_390_TLS_IE64:
+ // These two involve an absolute address
+ if (parameters->options().shared()
+ && optimized_type == tls::TLSOPT_NONE)
+ {
+ if ((size == 32 && r_type == elfcpp::R_390_TLS_IE32) ||
+ (size == 64 && r_type == elfcpp::R_390_TLS_IE64))
+ {
+ // We need to create a dynamic relocation.
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ unsigned int r_sym =
+ elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ rela_dyn->add_local_relative(object, r_sym,
+ elfcpp::R_390_RELATIVE,
+ output_section, data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend(), false);
+ }
+ else
+ {
+ unsupported_reloc_local(object, r_type);
+ }
+ }
+ // fall through
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_GOTIE12:
+ case elfcpp::R_390_TLS_GOTIE20:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_LOAD:
+ layout->set_has_static_tls();
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ if (!output_is_shared)
+ {
+ // We're making an executable, and the symbol is local, but
+ // we cannot optimize to LE. Make a const GOT entry instead.
+ Output_data_got<size, true>* got
+ = target->got_section(symtab, layout);
+ unsigned int r_sym
+ = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ got->add_local_plt(object, r_sym, GOT_TYPE_TLS_OFFSET);
+ }
+ else
+ {
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<size, true>* got
+ = target->got_section(symtab, layout);
+ unsigned int r_sym
+ = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
+ target->rela_dyn_section(layout),
+ elfcpp::R_390_TLS_TPOFF);
+ }
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_local(object, r_type);
+ break;
+
+ case elfcpp::R_390_TLS_LE32: // Local-exec
+ case elfcpp::R_390_TLS_LE64:
+ layout->set_has_static_tls();
+ if (output_is_shared)
+ {
+ // We need to create a dynamic relocation.
+ if ((size == 32 && r_type == elfcpp::R_390_TLS_LE32) ||
+ (size == 64 && r_type == elfcpp::R_390_TLS_LE64))
+ {
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ unsigned int r_sym
+ = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
+ rela_dyn->add_local(object, r_sym, elfcpp::R_390_TLS_TPOFF,
+ output_section, data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend());
+ }
+ else
+ {
+ unsupported_reloc_local(object, r_type);
+ }
+ }
+ break;
+
+ default:
+ gold_unreachable();
+ }
+ }
+ break;
+
+ default:
+ gold_error(_("%s: unsupported reloc %u against local symbol"),
+ object->name().c_str(), r_type);
+ break;
+ }
+}
+
+// Scan a relocation for a global symbol.
+
+template<int size>
+inline void
+Target_s390<size>::Scan::global(Symbol_table* symtab,
+ Layout* layout,
+ Target_s390<size>* target,
+ Sized_relobj_file<size, true>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, true>& reloc,
+ unsigned int r_type,
+ Symbol* gsym)
+{
+ // A STT_GNU_IFUNC symbol may require a PLT entry.
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && this->reloc_needs_plt_for_ifunc(object, r_type))
+ target->make_plt_entry(symtab, layout, gsym);
+
+ switch (r_type)
+ {
+ case elfcpp::R_390_NONE:
+ case elfcpp::R_390_GNU_VTINHERIT:
+ case elfcpp::R_390_GNU_VTENTRY:
+ break;
+
+ case elfcpp::R_390_64:
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_20:
+ case elfcpp::R_390_16:
+ case elfcpp::R_390_12:
+ case elfcpp::R_390_8:
+ {
+ // 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(Scan::get_reference_flags(r_type)))
+ {
+ if (!parameters->options().output_is_position_independent()
+ && gsym->may_need_copy_reloc())
+ {
+ target->copy_reloc(symtab, layout, object,
+ data_shndx, output_section, gsym, reloc);
+ }
+ else if (((size == 64 && r_type == elfcpp::R_390_64)
+ || (size == 32 && r_type == elfcpp::R_390_32))
+ && gsym->type() == elfcpp::STT_GNU_IFUNC
+ && gsym->can_use_relative_reloc(false)
+ && !gsym->is_from_dynobj()
+ && !gsym->is_undefined()
+ && !gsym->is_preemptible())
+ {
+ // Use an IRELATIVE reloc for a locally defined
+ // STT_GNU_IFUNC symbol. This makes a function
+ // address in a PIE executable match the address in a
+ // shared library that it links against.
+ Reloc_section* rela_dyn =
+ target->rela_irelative_section(layout);
+ unsigned int r_type = elfcpp::R_390_IRELATIVE;
+ rela_dyn->add_symbolless_global_addend(gsym, r_type,
+ output_section, object,
+ data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend());
+ }
+ else if (((size == 64 && r_type == elfcpp::R_390_64)
+ || (size == 32 && r_type == elfcpp::R_390_32))
+ && gsym->can_use_relative_reloc(false))
+ {
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE,
+ output_section, object,
+ data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend(), false);
+ }
+ else
+ {
+ check_non_pic(object, r_type);
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_global(gsym, r_type, output_section, object,
+ data_shndx, reloc.get_r_offset(),
+ reloc.get_r_addend());
+ }
+ }
+ }
+ break;
+
+ case elfcpp::R_390_PC12DBL:
+ case elfcpp::R_390_PC16:
+ case elfcpp::R_390_PC16DBL:
+ case elfcpp::R_390_PC24DBL:
+ case elfcpp::R_390_PC32:
+ case elfcpp::R_390_PC32DBL:
+ case elfcpp::R_390_PC64:
+ {
+ // Make a PLT entry if necessary.
+ if (gsym->needs_plt_entry())
+ {
+ target->make_plt_entry(symtab, layout, gsym);
+ // larl is often used to take address of a function. Aim the
+ // symbol at 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(Scan::get_reference_flags(r_type)))
+ {
+ if (parameters->options().output_is_executable()
+ && gsym->may_need_copy_reloc())
+ {
+ target->copy_reloc(symtab, layout, object,
+ data_shndx, output_section, gsym, reloc);
+ }
+ else
+ {
+ check_non_pic(object, r_type);
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_global(gsym, r_type, output_section, object,
+ data_shndx, reloc.get_r_offset(),
+ reloc.get_r_addend());
+ }
+ }
+ }
+ break;
+
+ case elfcpp::R_390_PLT12DBL:
+ case elfcpp::R_390_PLT16DBL:
+ case elfcpp::R_390_PLT24DBL:
+ case elfcpp::R_390_PLT32:
+ case elfcpp::R_390_PLT32DBL:
+ case elfcpp::R_390_PLT64:
+ // 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_390_GOTPC:
+ case elfcpp::R_390_GOTPCDBL:
+ case elfcpp::R_390_GOTOFF16:
+ case elfcpp::R_390_GOTOFF32:
+ case elfcpp::R_390_GOTOFF64:
+ case elfcpp::R_390_PLTOFF16:
+ case elfcpp::R_390_PLTOFF32:
+ case elfcpp::R_390_PLTOFF64:
+ // We need a GOT section.
+ target->got_section(symtab, layout);
+ // For PLTOFF*, we also need a PLT entry (but only if the
+ // symbol is not fully resolved).
+ if ((r_type == elfcpp::R_390_PLTOFF16
+ || r_type == elfcpp::R_390_PLTOFF32
+ || r_type == elfcpp::R_390_PLTOFF64)
+ && !gsym->final_value_is_known())
+ target->make_plt_entry(symtab, layout, gsym);
+ break;
+
+ case elfcpp::R_390_GOT12:
+ case elfcpp::R_390_GOT16:
+ case elfcpp::R_390_GOT20:
+ case elfcpp::R_390_GOT32:
+ case elfcpp::R_390_GOT64:
+ case elfcpp::R_390_GOTENT:
+ case elfcpp::R_390_GOTPLT12:
+ case elfcpp::R_390_GOTPLT16:
+ case elfcpp::R_390_GOTPLT20:
+ case elfcpp::R_390_GOTPLT32:
+ case elfcpp::R_390_GOTPLT64:
+ case elfcpp::R_390_GOTPLTENT:
+ {
+ // The symbol requires a GOT entry.
+ Output_data_got<size, true>* got = target->got_section(symtab, layout);
+
+ if (gsym->final_value_is_known())
+ {
+ // For a STT_GNU_IFUNC symbol we want the PLT address.
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC)
+ got->add_global_plt(gsym, GOT_TYPE_STANDARD);
+ else
+ 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);
+
+ // Use a GLOB_DAT rather than a RELATIVE reloc if:
+ //
+ // 1) The symbol may be defined in some other module.
+ //
+ // 2) We are building a shared library and this is a
+ // protected symbol; using GLOB_DAT means that the dynamic
+ // linker can use the address of the PLT in the main
+ // executable when appropriate so that function address
+ // comparisons work.
+ //
+ // 3) This is a STT_GNU_IFUNC symbol in position dependent
+ // code, again so that function address comparisons work.
+ if (gsym->is_from_dynobj()
+ || gsym->is_undefined()
+ || gsym->is_preemptible()
+ || (gsym->visibility() == elfcpp::STV_PROTECTED
+ && parameters->options().shared())
+ || (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && parameters->options().output_is_position_independent()))
+ got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
+ elfcpp::R_390_GLOB_DAT);
+ else
+ {
+ // For a STT_GNU_IFUNC symbol we want to write the PLT
+ // offset into the GOT, so that function pointer
+ // comparisons work correctly.
+ bool is_new;
+ if (gsym->type() != elfcpp::STT_GNU_IFUNC)
+ is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
+ else
+ {
+ is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
+ // Tell the dynamic linker to use the PLT address
+ // when resolving relocations.
+ if (gsym->is_from_dynobj()
+ && !parameters->options().shared())
+ gsym->set_needs_dynsym_value();
+ }
+ if (is_new)
+ {
+ unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
+ rela_dyn->add_global_relative(gsym,
+ elfcpp::R_390_RELATIVE,
+ got, got_off, 0, false);
+ }
+ }
+ }
+ }
+ break;
+
+ case elfcpp::R_390_COPY:
+ case elfcpp::R_390_GLOB_DAT:
+ case elfcpp::R_390_JMP_SLOT:
+ case elfcpp::R_390_RELATIVE:
+ case elfcpp::R_390_IRELATIVE:
+ // These are outstanding tls relocs, which are unexpected when linking
+ case elfcpp::R_390_TLS_TPOFF:
+ case elfcpp::R_390_TLS_DTPOFF:
+ case elfcpp::R_390_TLS_DTPMOD:
+ gold_error(_("%s: unexpected reloc %u in object file"),
+ object->name().c_str(), r_type);
+ break;
+
+ // These are initial tls relocs, which are expected for global()
+ case elfcpp::R_390_TLS_GD32: // Global-dynamic
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_GDCALL:
+ case elfcpp::R_390_TLS_LDM32: // Local-dynamic
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_LDO64:
+ case elfcpp::R_390_TLS_LDCALL:
+ case elfcpp::R_390_TLS_IE32: // Initial-exec
+ case elfcpp::R_390_TLS_IE64:
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_GOTIE12:
+ case elfcpp::R_390_TLS_GOTIE20:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_LOAD:
+ case elfcpp::R_390_TLS_LE32: // Local-exec
+ case elfcpp::R_390_TLS_LE64:
+ {
+ // For the optimizable Initial-Exec model, we can treat undef symbols
+ // as final when building an executable.
+ const bool is_final = (gsym->final_value_is_known() ||
+ ((r_type == elfcpp::R_390_TLS_IE32 ||
+ r_type == elfcpp::R_390_TLS_IE64 ||
+ r_type == elfcpp::R_390_TLS_GOTIE32 ||
+ r_type == elfcpp::R_390_TLS_GOTIE64) &&
+ gsym->is_undefined() &&
+ parameters->options().output_is_executable()));
+ const tls::Tls_optimization optimized_type
+ = Target_s390<size>::optimize_tls_reloc(is_final, r_type);
+ switch (r_type)
+ {
+ case elfcpp::R_390_TLS_GD32: // General-dynamic
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_GDCALL:
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a pair of GOT entries for the module index and
+ // dtv-relative offset.
+ Output_data_got<size, true>* got
+ = target->got_section(symtab, layout);
+ got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
+ target->rela_dyn_section(layout),
+ elfcpp::R_390_TLS_DTPMOD,
+ elfcpp::R_390_TLS_DTPOFF);
+ }
+ else if (optimized_type == tls::TLSOPT_TO_IE)
+ {
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<size, true>* got
+ = target->got_section(symtab, layout);
+ got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
+ target->rela_dyn_section(layout),
+ elfcpp::R_390_TLS_TPOFF);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_global(object, r_type, gsym);
+ break;
+
+ case elfcpp::R_390_TLS_LDM32: // Local-dynamic
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDCALL:
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a GOT entry for the module index.
+ target->got_mod_index_entry(symtab, layout, object);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_global(object, r_type, gsym);
+ break;
+
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_LDO64:
+ break;
+
+ case elfcpp::R_390_TLS_IE32: // Initial-exec
+ case elfcpp::R_390_TLS_IE64:
+ // These two involve an absolute address
+ if (parameters->options().shared())
+ {
+ if ((size == 32 && r_type == elfcpp::R_390_TLS_IE32) ||
+ (size == 64 && r_type == elfcpp::R_390_TLS_IE64))
+ {
+ // We need to create a dynamic relocation.
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE,
+ output_section, object,
+ data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend(), false);
+ }
+ else
+ {
+ unsupported_reloc_global(object, r_type, gsym);
+ }
+ }
+ // fall through
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_GOTIE12:
+ case elfcpp::R_390_TLS_GOTIE20:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_LOAD:
+ layout->set_has_static_tls();
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ if (is_final && !parameters->options().shared())
+ {
+ // We're making an executable, and the symbol is local, but
+ // we cannot optimize to LE. Make a const GOT entry instead.
+ Output_data_got<size, true>* got
+ = target->got_section(symtab, layout);
+ got->add_global_plt(gsym, GOT_TYPE_TLS_OFFSET);
+ }
+ else
+ {
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<size, true>* got
+ = target->got_section(symtab, layout);
+ got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
+ target->rela_dyn_section(layout),
+ elfcpp::R_390_TLS_TPOFF);
+ }
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_global(object, r_type, gsym);
+ break;
+
+ case elfcpp::R_390_TLS_LE32: // Local-exec
+ case elfcpp::R_390_TLS_LE64:
+ layout->set_has_static_tls();
+ if (parameters->options().shared())
+ {
+ // We need to create a dynamic relocation.
+ if ((size == 32 && r_type == elfcpp::R_390_TLS_LE32) ||
+ (size == 64 && r_type == elfcpp::R_390_TLS_LE64))
+ {
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_global(gsym, elfcpp::R_390_TLS_TPOFF,
+ output_section, object,
+ data_shndx, reloc.get_r_offset(),
+ reloc.get_r_addend());
+ }
+ else
+ {
+ unsupported_reloc_global(object, r_type, gsym);
+ }
+ }
+ break;
+
+ default:
+ gold_unreachable();
+ }
+ }
+ break;
+
+ default:
+ gold_error(_("%s: unsupported reloc %u against global symbol %s"),
+ object->name().c_str(), r_type,
+ gsym->demangled_name().c_str());
+ break;
+ }
+}
+
+
+// Report an unsupported relocation against a global symbol.
+
+template<int size>
+void
+Target_s390<size>::Scan::unsupported_reloc_global(
+ Sized_relobj_file<size, true>* 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());
+}
+
+// Returns true if this relocation type could be that of a function pointer.
+template<int size>
+inline bool
+Target_s390<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
+{
+ switch (r_type)
+ {
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_64:
+ case elfcpp::R_390_PC32DBL: // could be used by larl insn
+ case elfcpp::R_390_GOT12:
+ case elfcpp::R_390_GOT16:
+ case elfcpp::R_390_GOT20:
+ case elfcpp::R_390_GOT32:
+ case elfcpp::R_390_GOT64:
+ case elfcpp::R_390_GOTENT:
+ case elfcpp::R_390_GOTOFF16:
+ case elfcpp::R_390_GOTOFF32:
+ case elfcpp::R_390_GOTOFF64:
+ return true;
+ }
+ return false;
+}
+
+// For safe ICF, scan a relocation for a local symbol to check if it
+// corresponds to a function pointer being taken. In that case mark
+// the function whose pointer was taken as not foldable.
+
+template<int size>
+inline bool
+Target_s390<size>::Scan::local_reloc_may_be_function_pointer(
+ Symbol_table* ,
+ Layout* ,
+ Target_s390<size>* ,
+ Sized_relobj_file<size, true>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, true>& ,
+ unsigned int r_type,
+ const elfcpp::Sym<size, true>&)
+{
+ // When building a shared library, do not fold any local symbols.
+ return (parameters->options().shared()
+ || possible_function_pointer_reloc(r_type));
+}
+
+// For safe ICF, scan a relocation for a global symbol to check if it
+// corresponds to a function pointer being taken. In that case mark
+// the function whose pointer was taken as not foldable.
+
+template<int size>
+inline bool
+Target_s390<size>::Scan::global_reloc_may_be_function_pointer(
+ Symbol_table*,
+ Layout* ,
+ Target_s390<size>* ,
+ Sized_relobj_file<size, true>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, true>& ,
+ unsigned int r_type,
+ Symbol* gsym)
+{
+ // When building a shared library, do not fold symbols whose visibility
+ // is hidden, internal or protected.
+ return ((parameters->options().shared()
+ && (gsym->visibility() == elfcpp::STV_INTERNAL
+ || gsym->visibility() == elfcpp::STV_PROTECTED
+ || gsym->visibility() == elfcpp::STV_HIDDEN))
+ || possible_function_pointer_reloc(r_type));
+}
+
+template<int size>
+void
+Target_s390<size>::gc_process_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, true>* 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)
+{
+
+ if (sh_type == elfcpp::SHT_REL)
+ return;
+
+ gold::gc_process_relocs<size, true, Target_s390<size>, elfcpp::SHT_RELA,
+ typename Target_s390<size>::Scan,
+ typename Target_s390<size>::Relocatable_size_for_reloc>(
+ symtab,
+ layout,
+ this,
+ object,
+ data_shndx,
+ prelocs,
+ reloc_count,
+ output_section,
+ needs_special_offset_handling,
+ local_symbol_count,
+ plocal_symbols);
+}
+
+// Perform a relocation.
+
+template<int size>
+inline bool
+Target_s390<size>::Relocate::relocate(
+ const Relocate_info<size, true>* relinfo,
+ Target_s390<size>* target,
+ Output_section*,
+ size_t relnum,
+ const elfcpp::Rela<size, true>& 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)
+{
+ if (view == NULL)
+ return true;
+
+ const Sized_relobj_file<size, true>* object = relinfo->object;
+
+ // Pick the value to use for symbols defined in the PLT.
+ Symbol_value<size> symval;
+ if (gsym != NULL
+ && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
+ {
+ symval.set_output_value(target->plt_address_for_global(gsym));
+ psymval = &symval;
+ }
+ else if (gsym == NULL && psymval->is_ifunc_symbol())
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
+ if (object->local_has_plt_offset(r_sym))
+ {
+ symval.set_output_value(target->plt_address_for_local(object, r_sym));
+ psymval = &symval;
+ }
+ }
+
+ const elfcpp::Elf_Xword addend = rela.get_r_addend();
+
+ typename elfcpp::Elf_types<size>::Elf_Addr value = 0;
+
+ switch (r_type)
+ {
+ case elfcpp::R_390_PLT64:
+ case elfcpp::R_390_PLT32:
+ case elfcpp::R_390_PLT32DBL:
+ case elfcpp::R_390_PLT24DBL:
+ case elfcpp::R_390_PLT16DBL:
+ case elfcpp::R_390_PLT12DBL:
+ gold_assert(gsym == NULL
+ || gsym->has_plt_offset()
+ || gsym->final_value_is_known()
+ || (gsym->is_defined()
+ && !gsym->is_from_dynobj()
+ && !gsym->is_preemptible()));
+ // fallthru
+ case elfcpp::R_390_8:
+ case elfcpp::R_390_12:
+ case elfcpp::R_390_16:
+ case elfcpp::R_390_20:
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_64:
+ case elfcpp::R_390_PC16:
+ case elfcpp::R_390_PC32:
+ case elfcpp::R_390_PC64:
+ case elfcpp::R_390_PC32DBL:
+ case elfcpp::R_390_PC24DBL:
+ case elfcpp::R_390_PC16DBL:
+ case elfcpp::R_390_PC12DBL:
+ value = psymval->value(object, addend);
+ break;
+
+ case elfcpp::R_390_GOTPC:
+ case elfcpp::R_390_GOTPCDBL:
+ gold_assert(gsym != NULL);
+ value = target->got_address() + addend;
+ break;
+
+ case elfcpp::R_390_PLTOFF64:
+ case elfcpp::R_390_PLTOFF32:
+ case elfcpp::R_390_PLTOFF16:
+ gold_assert(gsym == NULL
+ || gsym->has_plt_offset()
+ || gsym->final_value_is_known());
+ // fallthru
+ case elfcpp::R_390_GOTOFF64:
+ case elfcpp::R_390_GOTOFF32:
+ case elfcpp::R_390_GOTOFF16:
+ value = (psymval->value(object, addend)
+ - target->got_address());
+ break;
+
+ case elfcpp::R_390_GOT12:
+ case elfcpp::R_390_GOT16:
+ case elfcpp::R_390_GOT20:
+ case elfcpp::R_390_GOT32:
+ case elfcpp::R_390_GOT64:
+ case elfcpp::R_390_GOTENT:
+ case elfcpp::R_390_GOTPLT12:
+ case elfcpp::R_390_GOTPLT16:
+ case elfcpp::R_390_GOTPLT20:
+ case elfcpp::R_390_GOTPLT32:
+ case elfcpp::R_390_GOTPLT64:
+ case elfcpp::R_390_GOTPLTENT:
+ {
+ unsigned int got_offset = 0;
+ 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);
+ }
+ value = got_offset + target->got_main_offset() + addend;
+ }
+ break;
+
+ // These are initial tls relocs, which are expected when linking
+ case elfcpp::R_390_TLS_LOAD:
+ case elfcpp::R_390_TLS_GDCALL: // Global-dynamic
+ case elfcpp::R_390_TLS_GD32:
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_LDCALL: // Local-dynamic
+ case elfcpp::R_390_TLS_LDM32:
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_LDO64:
+ case elfcpp::R_390_TLS_GOTIE12: // Initial-exec
+ case elfcpp::R_390_TLS_GOTIE20:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_IE32:
+ case elfcpp::R_390_TLS_IE64:
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_LE32: // Local-exec
+ case elfcpp::R_390_TLS_LE64:
+ value = this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
+ view, view_size);
+ break;
+
+ default:
+ break;
+ }
+
+ typename S390_relocate_functions<size>::Status status
+ = S390_relocate_functions<size>::STATUS_OK;
+
+ switch (r_type)
+ {
+ case elfcpp::R_390_NONE:
+ case elfcpp::R_390_GNU_VTINHERIT:
+ case elfcpp::R_390_GNU_VTENTRY:
+ case elfcpp::R_390_TLS_GDCALL:
+ case elfcpp::R_390_TLS_LDCALL:
+ case elfcpp::R_390_TLS_LOAD:
+ break;
+
+ case elfcpp::R_390_64:
+ case elfcpp::R_390_GOT64:
+ case elfcpp::R_390_GOTPLT64:
+ case elfcpp::R_390_PLTOFF64:
+ case elfcpp::R_390_GOTOFF64:
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDO64:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_IE64:
+ case elfcpp::R_390_TLS_LE64:
+ Relocate_functions<size, true>::rela64(view, value, 0);
+ break;
+
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_GOT32:
+ case elfcpp::R_390_GOTPLT32:
+ case elfcpp::R_390_PLTOFF32:
+ case elfcpp::R_390_GOTOFF32:
+ case elfcpp::R_390_TLS_GD32:
+ case elfcpp::R_390_TLS_LDM32:
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_IE32:
+ case elfcpp::R_390_TLS_LE32:
+ Relocate_functions<size, true>::rela32(view, value, 0);
+ break;
+
+ case elfcpp::R_390_20:
+ case elfcpp::R_390_GOT20:
+ case elfcpp::R_390_GOTPLT20:
+ case elfcpp::R_390_TLS_GOTIE20:
+ status = S390_relocate_functions<size>::rela20(view, value);
+ break;
+
+ case elfcpp::R_390_16:
+ case elfcpp::R_390_GOT16:
+ case elfcpp::R_390_GOTPLT16:
+ case elfcpp::R_390_PLTOFF16:
+ case elfcpp::R_390_GOTOFF16:
+ status = S390_relocate_functions<size>::rela16(view, value);
+ break;
+
+ case elfcpp::R_390_12:
+ case elfcpp::R_390_GOT12:
+ case elfcpp::R_390_GOTPLT12:
+ case elfcpp::R_390_TLS_GOTIE12:
+ status = S390_relocate_functions<size>::rela12(view, value);
+ break;
+
+ case elfcpp::R_390_8:
+ Relocate_functions<size, true>::rela8(view, value, 0);
+ break;
+
+ case elfcpp::R_390_PC16:
+ Relocate_functions<size, true>::pcrela16(view, value, 0,
+ address);
+ break;
+
+ case elfcpp::R_390_PLT64:
+ case elfcpp::R_390_PC64:
+ Relocate_functions<size, true>::pcrela64(view, value, 0, address);
+ break;
+
+ case elfcpp::R_390_PLT32:
+ case elfcpp::R_390_PC32:
+ case elfcpp::R_390_GOTPC:
+ Relocate_functions<size, true>::pcrela32(view, value, 0, address);
+ break;
+
+ case elfcpp::R_390_PLT32DBL:
+ case elfcpp::R_390_PC32DBL:
+ case elfcpp::R_390_GOTPCDBL:
+ status = S390_relocate_functions<size>::pcrela32dbl(view, value, address);
+ break;
+
+ case elfcpp::R_390_PLT24DBL:
+ case elfcpp::R_390_PC24DBL:
+ status = S390_relocate_functions<size>::pcrela24dbl(view, value, address);
+ break;
+
+ case elfcpp::R_390_PLT16DBL:
+ case elfcpp::R_390_PC16DBL:
+ status = S390_relocate_functions<size>::pcrela16dbl(view, value, address);
+ break;
+
+ case elfcpp::R_390_PLT12DBL:
+ case elfcpp::R_390_PC12DBL:
+ status = S390_relocate_functions<size>::pcrela12dbl(view, value, address);
+ break;
+
+ case elfcpp::R_390_GOTENT:
+ case elfcpp::R_390_GOTPLTENT:
+ case elfcpp::R_390_TLS_IEENT:
+ value += target->got_address();
+ status = S390_relocate_functions<size>::pcrela32dbl(view, value, address);
+ break;
+
+ case elfcpp::R_390_COPY:
+ case elfcpp::R_390_GLOB_DAT:
+ case elfcpp::R_390_JMP_SLOT:
+ case elfcpp::R_390_RELATIVE:
+ case elfcpp::R_390_IRELATIVE:
+ // These are outstanding tls relocs, which are unexpected when linking
+ case elfcpp::R_390_TLS_TPOFF:
+ case elfcpp::R_390_TLS_DTPMOD:
+ case elfcpp::R_390_TLS_DTPOFF:
+ 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;
+ }
+
+ if (status != S390_relocate_functions<size>::STATUS_OK)
+ {
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("relocation overflow"));
+ }
+
+ return true;
+}
+
+// Perform a TLS relocation.
+
+template<int size>
+inline typename elfcpp::Elf_types<size>::Elf_Addr
+Target_s390<size>::Relocate::relocate_tls(
+ const Relocate_info<size, true>* relinfo,
+ Target_s390<size>* target,
+ size_t relnum,
+ const elfcpp::Rela<size, true>& rela,
+ unsigned int r_type,
+ const Sized_symbol<size>* gsym,
+ const Symbol_value<size>* psymval,
+ unsigned char* view,
+ section_size_type view_size)
+{
+ Output_segment* tls_segment = relinfo->layout->tls_segment();
+
+ const Sized_relobj_file<size, true>* object = relinfo->object;
+ const elfcpp::Elf_Xword addend = rela.get_r_addend();
+ elfcpp::Shdr<size, true> data_shdr(relinfo->data_shdr);
+ bool is_allocatable = (data_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0;
+
+ typename elfcpp::Elf_types<size>::Elf_Addr value
+ = psymval->value(relinfo->object, addend);
+
+ const bool is_final = (gsym == NULL
+ ? !parameters->options().shared()
+ : gsym->final_value_is_known());
+ tls::Tls_optimization optimized_type
+ = Target_s390<size>::optimize_tls_reloc(is_final, r_type);
+ switch (r_type)
+ {
+ case elfcpp::R_390_TLS_GDCALL: // Global-dynamic marker
+ if (optimized_type == tls::TLSOPT_TO_LE)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return 0;
+ }
+ this->tls_gd_to_le(relinfo, relnum, rela, view, view_size);
+ break;
+ }
+ else
+ {
+ if (optimized_type == tls::TLSOPT_TO_IE)
+ {
+ this->tls_gd_to_ie(relinfo, relnum, rela, view, view_size);
+ break;
+ }
+ else if (optimized_type == tls::TLSOPT_NONE)
+ {
+ break;
+ }
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported reloc %u"), r_type);
+ break;
+
+ case elfcpp::R_390_TLS_GD32: // Global-dynamic
+ case elfcpp::R_390_TLS_GD64:
+ if (optimized_type == tls::TLSOPT_TO_LE)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return 0;
+ }
+ return value - tls_segment->memsz();
+ }
+ else
+ {
+ unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
+ ? GOT_TYPE_TLS_OFFSET
+ : GOT_TYPE_TLS_PAIR);
+ if (gsym != NULL)
+ {
+ gold_assert(gsym->has_got_offset(got_type));
+ return (gsym->got_offset(got_type)
+ + target->got_main_offset()
+ + addend);
+ }
+ 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));
+ return (object->local_got_offset(r_sym, got_type)
+ + target->got_main_offset()
+ + addend);
+ }
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported reloc %u"), r_type);
+ break;
+
+ case elfcpp::R_390_TLS_LDCALL: // Local-dynamic marker
+ // This is a marker relocation. If the sequence is being turned to LE,
+ // we modify the instruction, otherwise the instruction is untouched.
+ if (optimized_type == tls::TLSOPT_TO_LE)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return 0;
+ }
+ this->tls_ld_to_le(relinfo, relnum, rela, view, view_size);
+ break;
+ }
+ else if (optimized_type == tls::TLSOPT_NONE)
+ {
+ break;
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported reloc %u"), r_type);
+ break;
+
+ case elfcpp::R_390_TLS_LDM32: // Local-dynamic module
+ case elfcpp::R_390_TLS_LDM64:
+ if (optimized_type == tls::TLSOPT_TO_LE)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return 0;
+ }
+ // Doesn't matter what we fill it with - it's going to be unused.
+ return 0;
+ }
+ else if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Relocate the field with the offset of the GOT entry for
+ // the module index.
+ return (target->got_mod_index_entry(NULL, NULL, NULL)
+ + addend
+ + target->got_main_offset());
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported reloc %u"), r_type);
+ break;
+
+ case elfcpp::R_390_TLS_LDO32: // Local-dynamic offset
+ case elfcpp::R_390_TLS_LDO64:
+ // This relocation type is used in debugging information.
+ // In that case we need to not optimize the value. If the
+ // section is not allocatable, then we assume we should not
+ // optimize this reloc.
+ if (optimized_type == tls::TLSOPT_TO_LE && is_allocatable)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return 0;
+ }
+ value -= tls_segment->memsz();
+ }
+ return value;
+
+ case elfcpp::R_390_TLS_LOAD: // Initial-exec marker
+ // This is a marker relocation. If the sequence is being turned to LE,
+ // we modify the instruction, otherwise the instruction is untouched.
+ if (gsym != NULL
+ && gsym->is_undefined()
+ && parameters->options().output_is_executable())
+ {
+ Target_s390<size>::Relocate::tls_ie_to_le(relinfo, relnum,
+ rela, view,
+ view_size);
+ break;
+ }
+ else if (optimized_type == tls::TLSOPT_TO_LE)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return 0;
+ }
+ Target_s390<size>::Relocate::tls_ie_to_le(relinfo, relnum,
+ rela, view,
+ view_size);
+ break;
+ }
+ else if (optimized_type == tls::TLSOPT_NONE)
+ {
+ break;
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported reloc type %u"),
+ r_type);
+ break;
+
+ case elfcpp::R_390_TLS_GOTIE12: // Initial-exec, not optimizable
+ case elfcpp::R_390_TLS_GOTIE20:
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_GOTIE32: // Initial-exec, optimizable
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_IE32:
+ case elfcpp::R_390_TLS_IE64:
+ if (gsym != NULL
+ && gsym->is_undefined()
+ && parameters->options().output_is_executable()
+ // These three cannot be optimized to LE, no matter what
+ && r_type != elfcpp::R_390_TLS_GOTIE12
+ && r_type != elfcpp::R_390_TLS_GOTIE20
+ && r_type != elfcpp::R_390_TLS_IEENT)
+ {
+ return value;
+ }
+ else if (optimized_type == tls::TLSOPT_TO_LE)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return 0;
+ }
+ return value - tls_segment->memsz();
+ }
+ else if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Relocate the field with the offset of the GOT entry for
+ // the tp-relative offset of the symbol.
+ unsigned int got_offset;
+ if (gsym != NULL)
+ {
+ gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
+ got_offset = gsym->got_offset(GOT_TYPE_TLS_OFFSET);
+ }
+ 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_TLS_OFFSET));
+ got_offset = object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET);
+ }
+ got_offset += target->got_main_offset();
+ if (r_type == elfcpp::R_390_TLS_IE32
+ || r_type == elfcpp::R_390_TLS_IE64)
+ return target->got_address() + got_offset + addend;
+ else
+ return got_offset + addend;
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported reloc type %u"),
+ r_type);
+ break;
+
+ case elfcpp::R_390_TLS_LE32: // Local-exec
+ case elfcpp::R_390_TLS_LE64:
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return 0;
+ }
+ return value - tls_segment->memsz();
+ }
+ return 0;
+}
+
+// Do a relocation in which we convert a TLS General-Dynamic to an
+// Initial-Exec.
+
+template<int size>
+inline void
+Target_s390<size>::Relocate::tls_gd_to_ie(
+ const Relocate_info<size, true>* relinfo,
+ size_t relnum,
+ const elfcpp::Rela<size, true>& rela,
+ unsigned char* view,
+ section_size_type view_size)
+{
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
+ if (view[0] == 0x4d)
+ {
+ // bas, don't care about details
+ // Change to l %r2, 0(%r2, %r12)
+ view[0] = 0x58;
+ view[1] = 0x22;
+ view[2] = 0xc0;
+ view[3] = 0x00;
+ return;
+ }
+ else if (view[0] == 0xc0)
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6);
+ // brasl %r14, __tls_get_offset@plt
+ if (view[1] == 0xe5)
+ {
+ // Change to l/lg %r2, 0(%r2, %r12)
+ // There was a PLT32DBL reloc at the last 4 bytes, overwrite its result.
+ if (size == 32)
+ {
+ // l
+ view[0] = 0x58;
+ view[1] = 0x22;
+ view[2] = 0xc0;
+ view[3] = 0x00;
+ // nop
+ view[4] = 0x07;
+ view[5] = 0x07;
+ }
+ else
+ {
+ // lg
+ view[0] = 0xe3;
+ view[1] = 0x22;
+ view[2] = 0xc0;
+ view[3] = 0;
+ view[4] = 0;
+ view[5] = 0x04;
+ }
+ return;
+ }
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported op for GD to IE"));
+}
+
+// Do a relocation in which we convert a TLS General-Dynamic to a
+// Local-Exec.
+
+template<int size>
+inline void
+Target_s390<size>::Relocate::tls_gd_to_le(
+ const Relocate_info<size, true>* relinfo,
+ size_t relnum,
+ const elfcpp::Rela<size, true>& rela,
+ unsigned char* view,
+ section_size_type view_size)
+{
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
+ if (view[0] == 0x0d)
+ {
+ // basr, change to nop
+ view[0] = 0x07;
+ view[1] = 0x07;
+ }
+ else if (view[0] == 0x4d)
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
+ // bas, don't care about details, change to nop
+ view[0] = 0x47;
+ view[1] = 0;
+ view[2] = 0;
+ view[3] = 0;
+ return;
+ }
+ else if (view[0] == 0xc0)
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6);
+ // brasl %r14, __tls_get_offset@plt
+ if (view[1] == 0xe5)
+ {
+ // Change to nop jump. There was a PLT32DBL reloc at the last
+ // 4 bytes, overwrite its result.
+ view[1] = 0x04;
+ view[2] = 0;
+ view[3] = 0;
+ view[4] = 0;
+ view[5] = 0;
+ return;
+ }
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported op for GD to LE"));
+}
+
+template<int size>
+inline void
+Target_s390<size>::Relocate::tls_ld_to_le(
+ const Relocate_info<size, true>* relinfo,
+ size_t relnum,
+ const elfcpp::Rela<size, true>& rela,
+ unsigned char* view,
+ section_size_type view_size)
+{
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
+
+ if (view[0] == 0x0d)
+ {
+ // basr, change to nop
+ view[0] = 0x07;
+ view[1] = 0x07;
+ }
+ else if (view[0] == 0x4d)
+ {
+ // bas, don't care about details, change to nop
+ view[0] = 0x47;
+ view[1] = 0;
+ view[2] = 0;
+ view[3] = 0;
+ return;
+ }
+ else if (view[0] == 0xc0)
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6);
+ // brasl %r14, __tls_get_offset@plt
+ if (view[1] == 0xe5)
+ {
+ // Change to nop jump. There was a PLT32DBL reloc at the last
+ // 4 bytes, overwrite its result.
+ view[1] = 0x04;
+ view[2] = 0;
+ view[3] = 0;
+ view[4] = 0;
+ view[5] = 0;
+ return;
+ }
+ }
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported op for LD to LE"));
+}
+
+// Do a relocation in which we convert a TLS Initial-Exec to a
+// Local-Exec.
+
+template<int size>
+inline void
+Target_s390<size>::Relocate::tls_ie_to_le(
+ const Relocate_info<size, true>* relinfo,
+ size_t relnum,
+ const elfcpp::Rela<size, true>& rela,
+ unsigned char* view,
+ section_size_type view_size)
+{
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
+
+ if (view[0] == 0x58)
+ {
+ // l %rX, 0(%rY) or l %rX, 0(%rY, %r12)
+ if ((view[2] & 0x0f) != 0 || view[3] != 0)
+ goto err;
+ int rx = view[1] >> 4 & 0xf;
+ int ry = view[1] & 0xf;
+ int rz = view[2] >> 4 & 0xf;
+ if (rz == 0)
+ {
+ }
+ else if (ry == 0)
+ {
+ ry = rz;
+ }
+ else if (rz == 12)
+ {
+ }
+ else if (ry == 12)
+ {
+ ry = rz;
+ }
+ else
+ goto err;
+ // to lr %rX, $rY
+ view[0] = 0x18;
+ view[1] = rx << 4 | ry;
+ // and insert a nop
+ view[2] = 0x07;
+ view[3] = 0x00;
+ }
+ else if (view[0] == 0xe3)
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6);
+ // lg %rX, 0(%rY) or lg %rX, 0(%rY, %r12)
+ if ((view[2] & 0x0f) != 0 ||
+ view[3] != 0 ||
+ view[4] != 0 ||
+ view[5] != 0x04)
+ goto err;
+ int rx = view[1] >> 4 & 0xf;
+ int ry = view[1] & 0xf;
+ int rz = view[2] >> 4 & 0xf;
+ if (rz == 0)
+ {
+ }
+ else if (ry == 0)
+ {
+ ry = rz;
+ }
+ else if (rz == 12)
+ {
+ }
+ else if (ry == 12)
+ {
+ ry = rz;
+ }
+ else
+ goto err;
+ // to sllg %rX, $rY, 0
+ view[0] = 0xeb;
+ view[1] = rx << 4 | ry;
+ view[2] = 0x00;
+ view[3] = 0x00;
+ view[4] = 0x00;
+ view[5] = 0x0d;
+ }
+ else
+ {
+err:
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("unsupported op for IE to LE"));
+ }
+}
+
+// Scan relocations for a section.
+
+template<int size>
+void
+Target_s390<size>::scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, true>* 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)
+{
+ if (sh_type == elfcpp::SHT_REL)
+ {
+ gold_error(_("%s: unsupported REL reloc section"),
+ object->name().c_str());
+ return;
+ }
+
+ gold::scan_relocs<size, true, Target_s390<size>, elfcpp::SHT_RELA,
+ typename Target_s390<size>::Scan>(
+ 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>
+void
+Target_s390<size>::do_finalize_sections(
+ Layout* layout,
+ const Input_objects*,
+ Symbol_table* symtab)
+{
+ const Reloc_section* rel_plt = (this->plt_ == NULL
+ ? NULL
+ : this->plt_->rela_plt());
+ layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
+ this->rela_dyn_, true, size == 32);
+
+ this->layout_ = layout;
+
+ // 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));
+
+ // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
+ // the .got section.
+ Symbol* sym = this->global_offset_table_;
+ if (sym != NULL)
+ {
+ uint64_t data_size = this->got_->current_data_size();
+ symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
+ }
+
+ if (parameters->doing_static_link()
+ && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
+ {
+ // If linking statically, make sure that the __rela_iplt symbols
+ // were defined if necessary, even if we didn't create a PLT.
+ static const Define_symbol_in_segment syms[] =
+ {
+ {
+ "__rela_iplt_start", // name
+ elfcpp::PT_LOAD, // segment_type
+ elfcpp::PF_W, // segment_flags_set
+ elfcpp::PF(0), // segment_flags_clear
+ 0, // value
+ 0, // size
+ elfcpp::STT_NOTYPE, // type
+ elfcpp::STB_GLOBAL, // binding
+ elfcpp::STV_HIDDEN, // visibility
+ 0, // nonvis
+ Symbol::SEGMENT_START, // offset_from_base
+ true // only_if_ref
+ },
+ {
+ "__rela_iplt_end", // name
+ elfcpp::PT_LOAD, // segment_type
+ elfcpp::PF_W, // segment_flags_set
+ elfcpp::PF(0), // segment_flags_clear
+ 0, // value
+ 0, // size
+ elfcpp::STT_NOTYPE, // type
+ elfcpp::STB_GLOBAL, // binding
+ elfcpp::STV_HIDDEN, // visibility
+ 0, // nonvis
+ Symbol::SEGMENT_START, // offset_from_base
+ true // only_if_ref
+ }
+ };
+
+ symtab->define_symbols(layout, 2, syms,
+ layout->script_options()->saw_sections_clause());
+ }
+}
+
+// Return the size of a relocation while scanning during a relocatable
+// link.
+
+template<int size>
+unsigned int
+Target_s390<size>::Relocatable_size_for_reloc::get_size_for_reloc(
+ unsigned int r_type,
+ Relobj* object)
+{
+ switch (r_type)
+ {
+ case elfcpp::R_390_NONE:
+ case elfcpp::R_390_GNU_VTINHERIT:
+ case elfcpp::R_390_GNU_VTENTRY:
+ case elfcpp::R_390_TLS_GD32: // Global-dynamic
+ case elfcpp::R_390_TLS_GD64:
+ case elfcpp::R_390_TLS_GDCALL:
+ case elfcpp::R_390_TLS_LDM32: // Local-dynamic
+ case elfcpp::R_390_TLS_LDM64:
+ case elfcpp::R_390_TLS_LDO32:
+ case elfcpp::R_390_TLS_LDO64:
+ case elfcpp::R_390_TLS_LDCALL:
+ case elfcpp::R_390_TLS_IE32: // Initial-exec
+ case elfcpp::R_390_TLS_IE64:
+ case elfcpp::R_390_TLS_IEENT:
+ case elfcpp::R_390_TLS_GOTIE12:
+ case elfcpp::R_390_TLS_GOTIE20:
+ case elfcpp::R_390_TLS_GOTIE32:
+ case elfcpp::R_390_TLS_GOTIE64:
+ case elfcpp::R_390_TLS_LOAD:
+ case elfcpp::R_390_TLS_LE32: // Local-exec
+ case elfcpp::R_390_TLS_LE64:
+ return 0;
+
+ case elfcpp::R_390_64:
+ case elfcpp::R_390_PC64:
+ case elfcpp::R_390_GOT64:
+ case elfcpp::R_390_PLT64:
+ case elfcpp::R_390_GOTOFF64:
+ case elfcpp::R_390_GOTPLT64:
+ case elfcpp::R_390_PLTOFF64:
+ return 8;
+
+ case elfcpp::R_390_32:
+ case elfcpp::R_390_PC32:
+ case elfcpp::R_390_GOT32:
+ case elfcpp::R_390_PLT32:
+ case elfcpp::R_390_GOTOFF32:
+ case elfcpp::R_390_GOTPC:
+ case elfcpp::R_390_PC32DBL:
+ case elfcpp::R_390_PLT32DBL:
+ case elfcpp::R_390_GOTPCDBL:
+ case elfcpp::R_390_GOTENT:
+ case elfcpp::R_390_GOTPLT32:
+ case elfcpp::R_390_GOTPLTENT:
+ case elfcpp::R_390_PLTOFF32:
+ case elfcpp::R_390_20:
+ case elfcpp::R_390_GOT20:
+ case elfcpp::R_390_GOTPLT20:
+ return 4;
+
+ case elfcpp::R_390_PC24DBL:
+ case elfcpp::R_390_PLT24DBL:
+ return 3;
+
+ case elfcpp::R_390_12:
+ case elfcpp::R_390_GOT12:
+ case elfcpp::R_390_GOTPLT12:
+ case elfcpp::R_390_PC12DBL:
+ case elfcpp::R_390_PLT12DBL:
+ case elfcpp::R_390_16:
+ case elfcpp::R_390_GOT16:
+ case elfcpp::R_390_PC16:
+ case elfcpp::R_390_PC16DBL:
+ case elfcpp::R_390_PLT16DBL:
+ case elfcpp::R_390_GOTOFF16:
+ case elfcpp::R_390_GOTPLT16:
+ case elfcpp::R_390_PLTOFF16:
+ return 2;
+
+ case elfcpp::R_390_8:
+ return 1;
+
+ // These are relocations which should only be seen by the
+ // dynamic linker, and should never be seen here.
+ case elfcpp::R_390_COPY:
+ case elfcpp::R_390_GLOB_DAT:
+ case elfcpp::R_390_JMP_SLOT:
+ case elfcpp::R_390_RELATIVE:
+ case elfcpp::R_390_IRELATIVE:
+ case elfcpp::R_390_TLS_DTPMOD:
+ case elfcpp::R_390_TLS_DTPOFF:
+ case elfcpp::R_390_TLS_TPOFF:
+ object->error(_("unexpected reloc %u in object file"), r_type);
+ return 0;
+
+ default:
+ object->error(_("unsupported reloc %u in object file"), r_type);
+ return 0;
+ }
+}
+
+// Scan the relocs during a relocatable link.
+
+template<int size>
+void
+Target_s390<size>::scan_relocatable_relocs(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, true>* 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, true, elfcpp::SHT_RELA,
+ Scan_relocatable_relocs>(
+ 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>
+void
+Target_s390<size>::relocate_relocs(
+ const Relocate_info<size, true>* relinfo,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
+ const Relocatable_relocs* rr,
+ unsigned char* 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_relocs<size, true, 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 offset to use for the GOT_INDX'th got entry which is
+// for a local tls symbol specified by OBJECT, SYMNDX.
+template<int size>
+int64_t
+Target_s390<size>::do_tls_offset_for_local(
+ const Relobj*,
+ unsigned int,
+ unsigned int) const
+{
+ // The only way we can get called is when IEENT/GOTIE12/GOTIE20
+ // couldn't be optimised to LE.
+ Output_segment* tls_segment = layout_->tls_segment();
+ return -tls_segment->memsz();
+}
+
+// Return the offset to use for the GOT_INDX'th got entry which is
+// for global tls symbol GSYM.
+template<int size>
+int64_t
+Target_s390<size>::do_tls_offset_for_global(
+ Symbol*,
+ unsigned int) const
+{
+ Output_segment* tls_segment = layout_->tls_segment();
+ return -tls_segment->memsz();
+}
+
+// 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>
+uint64_t
+Target_s390<size>::do_dynsym_value(const Symbol* gsym) const
+{
+ gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
+ return this->plt_address_for_global(gsym);
+}
+
+// Return a string used to fill a code section with nops to take up
+// the specified length.
+
+template<int size>
+std::string
+Target_s390<size>::do_code_fill(section_size_type length) const
+{
+ if (length & 1)
+ gold_warning(_("S/390 code fill of odd length requested"));
+ return std::string(length, static_cast<char>(0x07));
+}
+
+// Relocate section data.
+
+template<int size>
+void
+Target_s390<size>::relocate_section(
+ const Relocate_info<size, true>* 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,
+ const Reloc_symbol_changes* reloc_symbol_changes)
+{
+ gold_assert(sh_type == elfcpp::SHT_RELA);
+
+ gold::relocate_section<size, true, Target_s390<size>, elfcpp::SHT_RELA,
+ typename Target_s390<size>::Relocate,
+ gold::Default_comdat_behavior>(
+ relinfo,
+ this,
+ prelocs,
+ reloc_count,
+ output_section,
+ needs_special_offset_handling,
+ view,
+ address,
+ view_size,
+ reloc_symbol_changes);
+}
+
+// Apply an incremental relocation. Incremental relocations always refer
+// to global symbols.
+
+template<int size>
+void
+Target_s390<size>::apply_relocation(
+ const Relocate_info<size, true>* relinfo,
+ typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
+ unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
+ const Symbol* gsym,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
+ section_size_type view_size)
+{
+ gold::apply_relocation<size, true, Target_s390<size>,
+ typename Target_s390<size>::Relocate>(
+ relinfo,
+ this,
+ r_offset,
+ r_type,
+ r_addend,
+ gsym,
+ view,
+ address,
+ view_size);
+}
+
+// The selector for s390 object files.
+
+template<int size>
+class Target_selector_s390 : public Target_selector
+{
+public:
+ Target_selector_s390()
+ : Target_selector(elfcpp::EM_S390, size, true,
+ (size == 64 ? "elf64-s390" : "elf32-s390"),
+ (size == 64 ? "elf64_s390" : "elf32_s390"))
+ { }
+
+ virtual Target*
+ do_instantiate_target()
+ { return new Target_s390<size>(); }
+};
+
+Target_selector_s390<32> target_selector_s390;
+Target_selector_s390<64> target_selector_s390x;
+
+} // End anonymous namespace.
projects / deliverable / binutils-gdb.git / commitdiff
