// x86_64.cc -- x86_64 target support for gold.
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright (C) 2006-2014 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <cstring>
#include "elfcpp.h"
+#include "dwarf.h"
#include "parameters.h"
#include "reloc.h"
#include "x86_64.h"
#include "target-reloc.h"
#include "target-select.h"
#include "tls.h"
+#include "freebsd.h"
+#include "nacl.h"
+#include "gc.h"
+#include "icf.h"
namespace
{
using namespace gold;
-class Output_data_plt_x86_64;
+// A class to handle the .got.plt section.
+
+class Output_data_got_plt_x86_64 : public Output_section_data_build
+{
+ public:
+ Output_data_got_plt_x86_64(Layout* layout)
+ : Output_section_data_build(8),
+ layout_(layout)
+ { }
+
+ Output_data_got_plt_x86_64(Layout* layout, off_t data_size)
+ : Output_section_data_build(data_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.
+// This is an abstract base class that handles most of the linker details
+// but does not know the actual contents of PLT entries. The derived
+// classes below fill in those details.
+
+template<int size>
+class Output_data_plt_x86_64 : public Output_section_data
+{
+ public:
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
+
+ Output_data_plt_x86_64(Layout* layout, uint64_t addralign,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative)
+ : Output_section_data(addralign), tlsdesc_rel_(NULL),
+ irelative_rel_(NULL), got_(got), got_plt_(got_plt),
+ got_irelative_(got_irelative), count_(0), irelative_count_(0),
+ tlsdesc_got_offset_(-1U), free_list_()
+ { this->init(layout); }
+
+ Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative,
+ unsigned int plt_count)
+ : Output_section_data((plt_count + 1) * plt_entry_size,
+ plt_entry_size, false),
+ tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
+ got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
+ irelative_count_(0), tlsdesc_got_offset_(-1U), 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* symtab, Layout*,
+ Sized_relobj_file<size, false>* relobj,
+ unsigned int local_sym_index);
+
+ // Add the relocation for a PLT entry.
+ void
+ add_relocation(Symbol_table*, Layout*, Symbol* gsym,
+ unsigned int got_offset);
+
+ // Add the reserved TLSDESC_PLT entry to the PLT.
+ void
+ reserve_tlsdesc_entry(unsigned int got_offset)
+ { this->tlsdesc_got_offset_ = got_offset; }
+
+ // Return true if a TLSDESC_PLT entry has been reserved.
+ bool
+ has_tlsdesc_entry() const
+ { return this->tlsdesc_got_offset_ != -1U; }
+
+ // Return the GOT offset for the reserved TLSDESC_PLT entry.
+ unsigned int
+ get_tlsdesc_got_offset() const
+ { return this->tlsdesc_got_offset_; }
+
+ // Return the offset of the reserved TLSDESC_PLT entry.
+ unsigned int
+ get_tlsdesc_plt_offset() const
+ {
+ return ((this->count_ + this->irelative_count_ + 1)
+ * this->get_plt_entry_size());
+ }
+
+ // Return the .rela.plt section data.
+ Reloc_section*
+ rela_plt()
+ { return this->rel_; }
+
+ // Return where the TLSDESC relocations should go.
+ Reloc_section*
+ rela_tlsdesc(Layout*);
+
+ // 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 this->get_plt_entry_size(); }
+
+ // Return the size of a PLT entry.
+ unsigned int
+ get_plt_entry_size() const
+ { return this->do_get_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) * this->get_plt_entry_size(),
+ (plt_index + 2) * this->get_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)
+ { this->do_add_eh_frame(layout); }
+
+ 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)
+ { this->do_fill_first_plt_entry(pov, got_address, 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_index)
+ {
+ return this->do_fill_plt_entry(pov, got_address, plt_address,
+ got_offset, plt_offset, plt_index);
+ }
+
+ // Fill in the reserved TLSDESC PLT entry.
+ void
+ fill_tlsdesc_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_base,
+ unsigned int tlsdesc_got_offset,
+ unsigned int plt_offset)
+ {
+ this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
+ tlsdesc_got_offset, plt_offset);
+ }
+
+ virtual unsigned int
+ do_get_plt_entry_size() const = 0;
+
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_addr)
+ = 0;
+
+ virtual unsigned int
+ do_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_index) = 0;
+
+ virtual void
+ do_fill_tlsdesc_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_base,
+ unsigned int tlsdesc_got_offset,
+ unsigned int plt_offset) = 0;
+
+ virtual void
+ do_add_eh_frame(Layout* layout) = 0;
+
+ 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")); }
+
+ // The CIE of the .eh_frame unwind information for the PLT.
+ static const int plt_eh_frame_cie_size = 16;
+ static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
+
+ private:
+ // Set the final size.
+ void
+ set_final_data_size();
+
+ // Write out the PLT data.
+ void
+ do_write(Output_file*);
+
+ // The reloc section.
+ Reloc_section* rel_;
+ // The TLSDESC relocs, if necessary. These must follow the regular
+ // PLT relocs.
+ Reloc_section* tlsdesc_rel_;
+ // The IRELATIVE relocs, if necessary. These must follow the
+ // regular PLT relocations and the TLSDESC relocations.
+ Reloc_section* irelative_rel_;
+ // The .got section.
+ Output_data_got<64, false>* got_;
+ // The .got.plt section.
+ Output_data_got_plt_x86_64* 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_X86_64_IRELATIVE relocs. These
+ // follow the regular PLT entries.
+ unsigned int irelative_count_;
+ // Offset of the reserved TLSDESC_GOT entry when needed.
+ unsigned int tlsdesc_got_offset_;
+ // List of available regions within the section, for incremental
+ // update links.
+ Free_list free_list_;
+};
+
+template<int size>
+class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size>
+{
+ public:
+ Output_data_plt_x86_64_standard(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative)
+ : Output_data_plt_x86_64<size>(layout, plt_entry_size,
+ got, got_plt, got_irelative)
+ { }
+
+ Output_data_plt_x86_64_standard(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative,
+ unsigned int plt_count)
+ : Output_data_plt_x86_64<size>(layout, plt_entry_size,
+ got, got_plt, got_irelative,
+ plt_count)
+ { }
+
+ protected:
+ virtual unsigned int
+ do_get_plt_entry_size() const
+ { return plt_entry_size; }
+
+ virtual void
+ do_add_eh_frame(Layout* layout)
+ {
+ layout->add_eh_frame_for_plt(this,
+ this->plt_eh_frame_cie,
+ this->plt_eh_frame_cie_size,
+ plt_eh_frame_fde,
+ plt_eh_frame_fde_size);
+ }
+
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
+
+ virtual unsigned int
+ do_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_index);
+
+ virtual void
+ do_fill_tlsdesc_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_base,
+ unsigned int tlsdesc_got_offset,
+ unsigned int plt_offset);
+
+ private:
+ // The size of an entry in the PLT.
+ static const int plt_entry_size = 16;
+
+ // The first entry in the PLT.
+ // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
+ // procedure linkage table for both programs and shared objects."
+ static const unsigned char first_plt_entry[plt_entry_size];
+
+ // Other entries in the PLT for an executable.
+ static const unsigned char plt_entry[plt_entry_size];
+
+ // The reserved TLSDESC entry in the PLT for an executable.
+ static const unsigned char tlsdesc_plt_entry[plt_entry_size];
+
+ // The .eh_frame unwind information for the PLT.
+ static const int plt_eh_frame_fde_size = 32;
+ static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
+};
// The x86_64 target class.
// See the ABI at
// http://people.redhat.com/drepper/tls.pdf
// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
-class Target_x86_64 : public Sized_target<64, false>
+template<int size>
+class Target_x86_64 : public Sized_target<size, false>
{
public:
// In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
// uses only Elf64_Rela relocation entries with explicit addends."
- typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section;
-
- Target_x86_64()
- : Sized_target<64, false>(&x86_64_info),
- got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL),
- copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL),
- got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
+
+ Target_x86_64(const Target::Target_info* info = &x86_64_info)
+ : Sized_target<size, false>(info),
+ got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
+ got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
+ rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
+ got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
+ tls_base_symbol_defined_(false)
{ }
+ // Hook for a new output section.
+ void
+ do_new_output_section(Output_section*) const;
+
// Scan the relocations to look for symbol adjustments.
void
- scan_relocs(const General_options& options,
- Symbol_table* symtab,
+ gc_process_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, false>* 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<64, false>* object,
+ Sized_relobj_file<size, false>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
// Finalize the sections.
void
- do_finalize_sections(Layout*);
+ do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
// Return the value to use for a dynamic which requires special
// treatment.
// Relocate a section.
void
- relocate_section(const Relocate_info<64, false>*,
+ relocate_section(const Relocate_info<size, false>*,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr view_address,
- section_size_type view_size);
+ 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(const General_options& options,
- Symbol_table* symtab,
+ scan_relocatable_relocs(Symbol_table* symtab,
Layout* layout,
- Sized_relobj<64, false>* object,
+ Sized_relobj_file<size, false>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
const unsigned char* plocal_symbols,
Relocatable_relocs*);
- // Relocate a section during a relocatable link.
+ // Emit relocations for a section.
void
- relocate_for_relocatable(const Relocate_info<64, false>*,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- off_t offset_in_output_section,
- const Relocatable_relocs*,
- unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr view_address,
- section_size_type view_size,
- unsigned char* reloc_view,
- section_size_type reloc_view_size);
+ relocate_relocs(
+ const Relocate_info<size, false>*,
+ 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 a string used to fill a code section with nops.
std::string
do_is_defined_by_abi(const Symbol* sym) const
{ return strcmp(sym->name(), "__tls_get_addr") == 0; }
+ // Return the symbol index to use for a target specific relocation.
+ // The only target specific relocation is R_X86_64_TLSDESC for a
+ // local symbol, which is an absolute reloc.
+ unsigned int
+ do_reloc_symbol_index(void*, unsigned int r_type) const
+ {
+ gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
+ return 0;
+ }
+
+ // Return the addend to use for a target specific relocation.
+ uint64_t
+ do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
+
+ // Return the PLT section.
+ 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); }
+
+ // 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. For x86_64
+ // pie binaries, safe ICF cannot be done by looking at relocation types.
+ bool
+ do_can_check_for_function_pointers() const
+ { return !parameters->options().pie(); }
+
+ // Return the base for a DW_EH_PE_datarel encoding.
+ uint64_t
+ do_ehframe_datarel_base() const;
+
+ // Adjust -fsplit-stack code which calls non-split-stack code.
+ void
+ do_calls_non_split(Relobj* object, unsigned int shndx,
+ section_offset_type fnoffset, section_size_type fnsize,
+ unsigned char* view, section_size_type view_size,
+ std::string* from, std::string* to) const;
+
// Return the size of the GOT section.
section_size_type
- got_size()
+ got_size() const
{
gold_assert(this->got_ != NULL);
return this->got_->data_size();
}
+ // Return the number of entries in the GOT.
+ unsigned int
+ got_entry_count() const
+ {
+ if (this->got_ == NULL)
+ return 0;
+ return this->got_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, false>* 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, false>* 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);
+
+ // Add a new reloc argument, returning the index in the vector.
+ size_t
+ add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym)
+ {
+ this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
+ return this->tlsdesc_reloc_info_.size() - 1;
+ }
+
+ Output_data_plt_x86_64<size>*
+ make_data_plt(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative)
+ {
+ return this->do_make_data_plt(layout, got, got_plt, got_irelative);
+ }
+
+ Output_data_plt_x86_64<size>*
+ make_data_plt(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative,
+ unsigned int plt_count)
+ {
+ return this->do_make_data_plt(layout, got, got_plt, got_irelative,
+ plt_count);
+ }
+
+ virtual Output_data_plt_x86_64<size>*
+ do_make_data_plt(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative)
+ {
+ return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
+ got_irelative);
+ }
+
+ virtual Output_data_plt_x86_64<size>*
+ do_make_data_plt(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative,
+ unsigned int plt_count)
+ {
+ return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
+ got_irelative,
+ plt_count);
+ }
+
private:
// The class which scans relocations.
class Scan
: issued_non_pic_error_(false)
{ }
+ static inline int
+ get_reference_flags(unsigned int r_type);
+
inline void
- local(const General_options& options, Symbol_table* symtab,
- Layout* layout, Target_x86_64* target,
- Sized_relobj<64, false>* object,
+ local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
+ Sized_relobj_file<size, false>* object,
unsigned int data_shndx,
Output_section* output_section,
- const elfcpp::Rela<64, false>& reloc, unsigned int r_type,
- const elfcpp::Sym<64, false>& lsym);
+ const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
+ const elfcpp::Sym<size, false>& lsym,
+ bool is_discarded);
inline void
- global(const General_options& options, Symbol_table* symtab,
- Layout* layout, Target_x86_64* target,
- Sized_relobj<64, false>* object,
+ global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
+ Sized_relobj_file<size, false>* object,
unsigned int data_shndx,
Output_section* output_section,
- const elfcpp::Rela<64, false>& reloc, unsigned int r_type,
+ const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
Symbol* gsym);
+ inline bool
+ local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
+ Target_x86_64* target,
+ Sized_relobj_file<size, false>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, false>& reloc,
+ unsigned int r_type,
+ const elfcpp::Sym<size, false>& lsym);
+
+ inline bool
+ global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
+ Target_x86_64* target,
+ Sized_relobj_file<size, false>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, false>& reloc,
+ unsigned int r_type,
+ Symbol* gsym);
+
private:
static void
- unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type);
+ unsupported_reloc_local(Sized_relobj_file<size, false>*,
+ unsigned int r_type);
static void
- unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type,
- Symbol*);
+ unsupported_reloc_global(Sized_relobj_file<size, false>*,
+ unsigned int r_type, Symbol*);
void
- check_non_pic(Relobj*, unsigned int r_type);
+ check_non_pic(Relobj*, unsigned int r_type, Symbol*);
+
+ inline bool
+ possible_function_pointer_reloc(unsigned int r_type);
+
+ bool
+ reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*,
+ unsigned int r_type);
// Whether we have issued an error about a non-PIC compilation.
bool issued_non_pic_error_;
{
public:
Relocate()
- : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false)
+ : skip_call_tls_get_addr_(false)
{ }
~Relocate()
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
- relocate(const Relocate_info<64, false>*, Target_x86_64*, size_t relnum,
- const elfcpp::Rela<64, false>&,
- unsigned int r_type, const Sized_symbol<64>*,
- const Symbol_value<64>*,
- unsigned char*, elfcpp::Elf_types<64>::Elf_Addr,
+ relocate(const Relocate_info<size, false>*, Target_x86_64*,
+ Output_section*,
+ size_t relnum, const elfcpp::Rela<size, false>&,
+ unsigned int r_type, const Sized_symbol<size>*,
+ const Symbol_value<size>*,
+ unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type);
private:
// Do a TLS relocation.
inline void
- relocate_tls(const Relocate_info<64, false>*, Target_x86_64*,
- size_t relnum, const elfcpp::Rela<64, false>&,
- unsigned int r_type, const Sized_symbol<64>*,
- const Symbol_value<64>*,
- unsigned char*, elfcpp::Elf_types<64>::Elf_Addr,
+ relocate_tls(const Relocate_info<size, false>*, Target_x86_64*,
+ size_t relnum, const elfcpp::Rela<size, false>&,
+ unsigned int r_type, const Sized_symbol<size>*,
+ const Symbol_value<size>*,
+ unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type);
// Do a TLS General-Dynamic to Initial-Exec transition.
inline void
- tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum,
+ tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
Output_segment* tls_segment,
- const elfcpp::Rela<64, false>&, unsigned int r_type,
- elfcpp::Elf_types<64>::Elf_Addr value,
+ const elfcpp::Rela<size, false>&, unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr,
+ typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type view_size);
// Do a TLS General-Dynamic to Local-Exec transition.
inline void
- tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum,
+ tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
Output_segment* tls_segment,
- const elfcpp::Rela<64, false>&, unsigned int r_type,
- elfcpp::Elf_types<64>::Elf_Addr value,
+ const elfcpp::Rela<size, false>&, unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned char* view,
section_size_type view_size);
// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
inline void
- tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum,
+ tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
Output_segment* tls_segment,
- const elfcpp::Rela<64, false>&, unsigned int r_type,
- elfcpp::Elf_types<64>::Elf_Addr value,
+ const elfcpp::Rela<size, false>&, unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr,
+ typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type view_size);
// Do a TLSDESC-style General-Dynamic to Local-Exec transition.
inline void
- tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum,
+ tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
Output_segment* tls_segment,
- const elfcpp::Rela<64, false>&, unsigned int r_type,
- elfcpp::Elf_types<64>::Elf_Addr value,
+ const elfcpp::Rela<size, false>&, unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
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<64, false>*, size_t relnum,
+ tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum,
Output_segment* tls_segment,
- const elfcpp::Rela<64, false>&, unsigned int r_type,
- elfcpp::Elf_types<64>::Elf_Addr value,
+ const elfcpp::Rela<size, false>&, unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
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<64, false>*, size_t relnum,
+ tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum,
Output_segment* tls_segment,
- const elfcpp::Rela<64, false>&, unsigned int r_type,
- elfcpp::Elf_types<64>::Elf_Addr value,
+ const elfcpp::Rela<size, false>&, unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned char* view,
section_size_type view_size);
// This is set if we should skip the next reloc, which should be a
// PLT32 reloc against ___tls_get_addr.
bool skip_call_tls_get_addr_;
-
- // This is set if we see a relocation which could load the address
- // of the TLS block. Whether we see such a relocation determines
- // how we handle the R_X86_64_DTPOFF32 relocation, which is used
- // in debugging sections.
- bool saw_tls_block_reloc_;
};
// A class which returns the size required for a relocation type,
got_section(Symbol_table*, Layout*);
// Get the GOT PLT section.
- Output_data_space*
+ Output_data_got_plt_x86_64*
got_plt_section() const
{
gold_assert(this->got_plt_ != NULL);
return this->got_plt_;
}
+ // Get the GOT section for TLSDESC entries.
+ Output_data_got<64, false>*
+ got_tlsdesc_section() const
+ {
+ gold_assert(this->got_tlsdesc_ != NULL);
+ return this->got_tlsdesc_;
+ }
+
// Create the PLT section.
void
make_plt_section(Symbol_table* symtab, Layout* layout);
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, false>* relobj,
+ unsigned int local_sym_index);
+
// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
void
define_tls_base_symbol(Symbol_table*, Layout*);
// Create a GOT entry for the TLS module index.
unsigned int
got_mod_index_entry(Symbol_table* symtab, Layout* layout,
- Sized_relobj<64, false>* object);
+ Sized_relobj_file<size, false>* object);
// Get the PLT section.
- Output_data_plt_x86_64*
+ Output_data_plt_x86_64<size>*
plt_section() const
{
gold_assert(this->plt_ != NULL);
Reloc_section*
rela_dyn_section(Layout*);
- // Return true if the symbol may need a COPY relocation.
- // References from an executable object to non-function symbols
- // defined in a dynamic object may need a COPY relocation.
- bool
- may_need_copy_reloc(Symbol* gsym)
- {
- return (!parameters->options().shared()
- && gsym->is_from_dynobj()
- && gsym->type() != elfcpp::STT_FUNC);
- }
+ // Get the section to use for TLSDESC relocations.
+ Reloc_section*
+ rela_tlsdesc_section(Layout*) const;
+
+ // 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<64, false>* object,
+ Sized_relobj_file<size, false>* object,
unsigned int shndx, Output_section* output_section,
- Symbol* sym, const elfcpp::Rela<64, false>& reloc)
+ Symbol* sym, const elfcpp::Rela<size, false>& reloc)
{
this->copy_relocs_.copy_reloc(symtab, layout,
- symtab->get_sized_symbol<64>(sym),
+ symtab->get_sized_symbol<size>(sym),
object, shndx, output_section,
reloc, this->rela_dyn_section(layout));
}
// general Target structure.
static const Target::Target_info x86_64_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_DESC = 3 // GOT entry for TLS_DESC pair
};
+ // This type is used as the argument to the target specific
+ // relocation routines. The only target specific reloc is
+ // R_X86_64_TLSDESC against a local symbol.
+ struct Tlsdesc_info
+ {
+ Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym)
+ : object(a_object), r_sym(a_r_sym)
+ { }
+
+ // The object in which the local symbol is defined.
+ Sized_relobj_file<size, false>* object;
+ // The local symbol index in the object.
+ unsigned int r_sym;
+ };
+
// The GOT section.
Output_data_got<64, false>* got_;
// The PLT section.
- Output_data_plt_x86_64* plt_;
+ Output_data_plt_x86_64<size>* plt_;
// The GOT PLT section.
- Output_data_space* got_plt_;
+ Output_data_got_plt_x86_64* got_plt_;
+ // The GOT section for IRELATIVE relocations.
+ Output_data_space* got_irelative_;
+ // The GOT section for TLSDESC relocations.
+ Output_data_got<64, false>* got_tlsdesc_;
+ // 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, 64, false> copy_relocs_;
- // Space for variables copied with a COPY reloc.
- Output_data_space* dynbss_;
+ Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
// Offset of the GOT entry for the TLS module index.
unsigned int got_mod_index_offset_;
+ // We handle R_X86_64_TLSDESC against a local symbol as a target
+ // specific relocation. Here we store the object and local symbol
+ // index for the relocation.
+ std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
// True if the _TLS_MODULE_BASE_ symbol has been defined.
bool tls_base_symbol_defined_;
};
-const Target::Target_info Target_x86_64::x86_64_info =
+template<>
+const Target::Target_info Target_x86_64<64>::x86_64_info =
{
64, // size
false, // is_big_endian
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", // program interpreter
0x400000, // default_text_segment_address
0x1000, // abi_pagesize (overridable by -z max-page-size)
- 0x1000 // common_pagesize (overridable by -z common-page-size)
+ 0x1000, // common_pagesize (overridable by -z common-page-size)
+ false, // isolate_execinstr
+ 0, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
+ 0, // small_common_section_flags
+ elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
+};
+
+template<>
+const Target::Target_info Target_x86_64<32>::x86_64_info =
+{
+ 32, // size
+ false, // is_big_endian
+ elfcpp::EM_X86_64, // 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
+ "/libx32/ldx32.so.1", // program interpreter
+ 0x400000, // default_text_segment_address
+ 0x1000, // abi_pagesize (overridable by -z max-page-size)
+ 0x1000, // common_pagesize (overridable by -z common-page-size)
+ false, // isolate_execinstr
+ 0, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
+ 0, // small_common_section_flags
+ elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
};
+// This is called when a new output section is created. This is where
+// we handle the SHF_X86_64_LARGE.
+
+template<int size>
+void
+Target_x86_64<size>::do_new_output_section(Output_section* os) const
+{
+ if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
+ os->set_is_large_section();
+}
+
// Get the GOT section, creating it if necessary.
+template<int size>
Output_data_got<64, false>*
-Target_x86_64::got_section(Symbol_table* symtab, Layout* layout)
+Target_x86_64<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.plt as a relro section.
+ // Without -z now, it is modified after program startup by lazy
+ // PLT relocations.
+ bool is_got_plt_relro = parameters->options().now();
+ Output_section_order got_order = (is_got_plt_relro
+ ? ORDER_RELRO
+ : ORDER_RELRO_LAST);
+ Output_section_order got_plt_order = (is_got_plt_relro
+ ? ORDER_RELRO
+ : ORDER_NON_RELRO_FIRST);
+
this->got_ = new Output_data_got<64, false>();
- Output_section* os;
- os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
- (elfcpp::SHF_ALLOC
- | elfcpp::SHF_WRITE),
- this->got_);
- os->set_is_relro();
-
- // 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_space(8, "** GOT PLT");
- os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
- (elfcpp::SHF_ALLOC
- | elfcpp::SHF_WRITE),
- this->got_plt_);
- os->set_is_relro();
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_, got_order, true);
+
+ this->got_plt_ = new Output_data_got_plt_x86_64(layout);
+ layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_plt_, got_plt_order,
+ is_got_plt_relro);
// The first three entries are reserved.
this->got_plt_->set_current_data_size(3 * 8);
+ if (!is_got_plt_relro)
+ {
+ // Those bytes can go into the relro segment.
+ layout->increase_relro(3 * 8);
+ }
+
// Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
- symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
- this->got_plt_,
- 0, 0, elfcpp::STT_OBJECT,
- elfcpp::STB_LOCAL,
- elfcpp::STV_HIDDEN, 0,
- false, false);
+ 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);
+
+ // 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(8, "** GOT IRELATIVE PLT");
+ layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_irelative_,
+ got_plt_order, is_got_plt_relro);
+
+ // If there are any TLSDESC relocations, they get GOT entries in
+ // .got.plt after the jump slot and IRELATIVE entries.
+ this->got_tlsdesc_ = new Output_data_got<64, false>();
+ layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_tlsdesc_,
+ got_plt_order, is_got_plt_relro);
}
return this->got_;
// Get the dynamic reloc section, creating it if necessary.
-Target_x86_64::Reloc_section*
-Target_x86_64::rela_dyn_section(Layout* layout)
+template<int size>
+typename Target_x86_64<size>::Reloc_section*
+Target_x86_64<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_);
+ elfcpp::SHF_ALLOC, this->rela_dyn_,
+ ORDER_DYNAMIC_RELOCS, false);
}
return this->rela_dyn_;
}
-// A class to handle the PLT data.
+// 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.
-class Output_data_plt_x86_64 : public Output_section_data
+template<int size>
+typename Target_x86_64<size>::Reloc_section*
+Target_x86_64<size>::rela_irelative_section(Layout* layout)
{
- public:
- typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section;
+ 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_;
+}
- Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*,
- Output_data_space*);
+// 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_i386::do_write.
- // Add an entry to the PLT.
- void
- add_entry(Symbol* gsym);
+void
+Output_data_got_plt_x86_64::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() >= 24);
+ unsigned char* const got_view = of->get_output_view(got_file_offset, 24);
+ Output_section* dynamic = this->layout_->dynamic_section();
+ uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
+ elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr);
+ memset(got_view + 8, 0, 16);
+ of->write_output_view(got_file_offset, 24, got_view);
+}
- // Add the reserved TLSDESC_PLT entry to the PLT.
- void
- reserve_tlsdesc_entry(unsigned int got_offset)
- { this->tlsdesc_got_offset_ = got_offset; }
+// Initialize the PLT section.
- // Return true if a TLSDESC_PLT entry has been reserved.
- bool
- has_tlsdesc_entry() const
- { return this->tlsdesc_got_offset_ != -1U; }
+template<int size>
+void
+Output_data_plt_x86_64<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);
+}
- // Return the GOT offset for the reserved TLSDESC_PLT entry.
- unsigned int
- get_tlsdesc_got_offset() const
- { return this->tlsdesc_got_offset_; }
+template<int size>
+void
+Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os)
+{
+ os->set_entsize(this->get_plt_entry_size());
+}
- // Return the offset of the reserved TLSDESC_PLT entry.
- unsigned int
- get_tlsdesc_plt_offset() const
- { return (this->count_ + 1) * plt_entry_size; }
+// Add an entry to the PLT.
- // Return the .rel.plt section data.
- const Reloc_section*
- rel_plt() const
- { return this->rel_; }
+template<int size>
+void
+Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout,
+ Symbol* gsym)
+{
+ gold_assert(!gsym->has_plt_offset());
- protected:
- void
- do_adjust_output_section(Output_section* os);
+ unsigned int plt_index;
+ off_t plt_offset;
+ section_offset_type got_offset;
- // Write to a map file.
- void
- do_print_to_mapfile(Mapfile* mapfile) const
- { mapfile->print_output_data(this, _("** PLT")); }
+ 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_;
+ }
- private:
- // The size of an entry in the PLT.
- static const int plt_entry_size = 16;
+ 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 * this->get_plt_entry_size();
- // The first entry in the PLT.
- // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
- // procedure linkage table for both programs and shared objects."
- static unsigned char first_plt_entry[plt_entry_size];
+ ++*pcount;
- // Other entries in the PLT for an executable.
- static unsigned char plt_entry[plt_entry_size];
+ got_offset = (plt_index - offset + reserved) * 8;
+ gold_assert(got_offset == got->current_data_size());
- // The reserved TLSDESC entry in the PLT for an executable.
- static unsigned char tlsdesc_plt_entry[plt_entry_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 + 8);
+ }
+ else
+ {
+ // FIXME: This is probably not correct for IRELATIVE relocs.
+
+ // For incremental updates, find an available slot.
+ plt_offset = this->free_list_.allocate(this->get_plt_entry_size(),
+ this->get_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 / this->get_plt_entry_size() - 1;
+ got_offset = (plt_index - offset + reserved) * 8;
+ }
- // Set the final size.
- void
- set_final_data_size();
+ gsym->set_plt_offset(plt_offset);
- // Write out the PLT data.
- void
- do_write(Output_file*);
+ // Every PLT entry needs a reloc.
+ this->add_relocation(symtab, layout, gsym, got_offset);
- // The reloc section.
- Reloc_section* rel_;
- // The .got section.
- Output_data_got<64, false>* got_;
- // The .got.plt section.
- Output_data_space* got_plt_;
- // The number of PLT entries.
- unsigned int count_;
- // Offset of the reserved TLSDESC_GOT entry when needed.
- unsigned int tlsdesc_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.
+}
-// Create the PLT section. The ordinary .got section is an argument,
-// since we need to refer to the start. We also create our own .got
-// section just for PLT entries.
+// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
+// the PLT offset.
-Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout,
- Output_data_got<64, false>* got,
- Output_data_space* got_plt)
- : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0),
- tlsdesc_got_offset_(-1U)
+template<int size>
+unsigned int
+Output_data_plt_x86_64<size>::add_local_ifunc_entry(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, false>* relobj,
+ unsigned int local_sym_index)
{
- this->rel_ = new Reloc_section(false);
- layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rel_);
+ unsigned int plt_offset = this->irelative_count_ * this->get_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 + 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_X86_64_IRELATIVE,
+ this->got_irelative_, got_offset, 0);
+
+ return plt_offset;
}
+// Add the relocation for a PLT entry.
+
+template<int size>
void
-Output_data_plt_x86_64::do_adjust_output_section(Output_section* os)
+Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab,
+ Layout* layout,
+ Symbol* gsym,
+ unsigned int got_offset)
{
- // UnixWare sets the entsize of .plt to 4, and so does the old GNU
- // linker, and so do we.
- os->set_entsize(4);
+ 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_X86_64_IRELATIVE,
+ this->got_irelative_, got_offset, 0);
+ }
+ else
+ {
+ gsym->set_needs_dynsym_entry();
+ this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
+ got_offset, 0);
+ }
}
-// Add an entry to the PLT.
+// Return where the TLSDESC relocations should go, creating it if
+// necessary. These follow the JUMP_SLOT relocations.
-void
-Output_data_plt_x86_64::add_entry(Symbol* gsym)
+template<int size>
+typename Output_data_plt_x86_64<size>::Reloc_section*
+Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout)
{
- gold_assert(!gsym->has_plt_offset());
+ if (this->tlsdesc_rel_ == NULL)
+ {
+ this->tlsdesc_rel_ = new Reloc_section(false);
+ layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
+ elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
+ ORDER_DYNAMIC_PLT_RELOCS, false);
+ gold_assert(this->tlsdesc_rel_->output_section()
+ == this->rel_->output_section());
+ }
+ return this->tlsdesc_rel_;
+}
- // Note that when setting the PLT offset we skip the initial
- // reserved PLT entry.
- gsym->set_plt_offset((this->count_ + 1) * plt_entry_size);
+// Return where the IRELATIVE relocations should go in the PLT. These
+// follow the JUMP_SLOT and the TLSDESC relocations.
- ++this->count_;
+template<int size>
+typename Output_data_plt_x86_64<size>::Reloc_section*
+Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab,
+ Layout* layout)
+{
+ if (this->irelative_rel_ == NULL)
+ {
+ // Make sure we have a place for the TLSDESC relocations, in
+ // case we see any later on.
+ this->rela_tlsdesc(layout);
+ 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_X86_64_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_;
+}
- section_offset_type got_offset = this->got_plt_->current_data_size();
+// Return the PLT address to use for a global symbol.
- // 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).
- this->got_plt_->set_current_data_size(got_offset + 8);
+template<int size>
+uint64_t
+Output_data_plt_x86_64<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) * this->get_plt_entry_size();
+ return this->address() + offset + gsym->plt_offset();
+}
- // Every PLT entry needs a reloc.
- gsym->set_needs_dynsym_entry();
- this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
- got_offset, 0);
+// Return the PLT address to use for a local symbol. These are always
+// IRELATIVE relocs.
- // 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.
+template<int size>
+uint64_t
+Output_data_plt_x86_64<size>::address_for_local(const Relobj* object,
+ unsigned int r_sym)
+{
+ return (this->address()
+ + (this->count_ + 1) * this->get_plt_entry_size()
+ + object->local_plt_offset(r_sym));
}
// Set the final size.
+template<int size>
void
-Output_data_plt_x86_64::set_final_data_size()
+Output_data_plt_x86_64<size>::set_final_data_size()
{
- unsigned int count = this->count_;
+ unsigned int count = this->count_ + this->irelative_count_;
if (this->has_tlsdesc_entry())
++count;
- this->set_data_size((count + 1) * plt_entry_size);
+ this->set_data_size((count + 1) * this->get_plt_entry_size());
}
// The first entry in the PLT for an executable.
-unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] =
+template<int size>
+const unsigned char
+Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] =
{
// From AMD64 ABI Draft 0.98, page 76
0xff, 0x35, // pushq contents of memory address
0x90, 0x90, 0x90, 0x90 // noop (x4)
};
+template<int size>
+void
+Output_data_plt_x86_64_standard<size>::do_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)
+{
+ memcpy(pov, first_plt_entry, plt_entry_size);
+ // We do a jmp relative to the PC at the end of this instruction.
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
+ (got_address + 8
+ - (plt_address + 6)));
+ elfcpp::Swap<32, false>::writeval(pov + 8,
+ (got_address + 16
+ - (plt_address + 12)));
+}
+
// Subsequent entries in the PLT for an executable.
-unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] =
+template<int size>
+const unsigned char
+Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] =
{
// From AMD64 ABI Draft 0.98, page 76
0xff, 0x25, // jmpq indirect
0, 0, 0, 0 // replaced with offset to start of .plt
};
+template<int size>
+unsigned int
+Output_data_plt_x86_64_standard<size>::do_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_index)
+{
+ memcpy(pov, plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
+ (got_address + got_offset
+ - (plt_address + plt_offset
+ + 6)));
+
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
+ elfcpp::Swap<32, false>::writeval(pov + 12,
+ - (plt_offset + plt_entry_size));
+
+ return 6;
+}
+
// The reserved TLSDESC entry in the PLT for an executable.
-unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] =
+template<int size>
+const unsigned char
+Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] =
{
// From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
// and AMD64/EM64T", Version 0.9.4 (2005-10-10).
0x40, 0
};
+template<int size>
+void
+Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry(
+ unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_base,
+ unsigned int tlsdesc_got_offset,
+ unsigned int plt_offset)
+{
+ memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
+ (got_address + 8
+ - (plt_address + plt_offset
+ + 6)));
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
+ (got_base
+ + tlsdesc_got_offset
+ - (plt_address + plt_offset
+ + 12)));
+}
+
+// The .eh_frame unwind information for the PLT.
+
+template<int size>
+const unsigned char
+Output_data_plt_x86_64<size>::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.
+ 16, // Return address column.
+ 1, // Augmentation size.
+ (elfcpp::DW_EH_PE_pcrel // FDE encoding.
+ | elfcpp::DW_EH_PE_sdata4),
+ elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
+ elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
+ elfcpp::DW_CFA_nop, // Align to 16 bytes.
+ elfcpp::DW_CFA_nop
+};
+
+template<int size>
+const unsigned char
+Output_data_plt_x86_64_standard<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_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
+ elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
+ elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
+ elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
+ elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
+ 11, // Block length.
+ elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
+ elfcpp::DW_OP_breg16, 0, // Push %rip.
+ elfcpp::DW_OP_lit15, // Push 0xf.
+ elfcpp::DW_OP_and, // & (%rip & 0xf).
+ elfcpp::DW_OP_lit11, // Push 0xb.
+ elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb)
+ elfcpp::DW_OP_lit3, // Push 3.
+ elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3)
+ elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
+ elfcpp::DW_CFA_nop, // Align to 32 bytes.
+ 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. This is specified by the AMD64 ABI.
+template<int size>
void
-Output_data_plt_x86_64::do_write(Output_file* of)
+Output_data_plt_x86_64<size>::do_write(Output_file* of)
{
const off_t offset = this->offset();
const section_size_type oview_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());
+ 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.
- elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address();
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
// The base address of the .got section.
- elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address();
+ typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->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.
- elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address();
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address
+ = this->got_plt_->address();
- memcpy(pov, first_plt_entry, plt_entry_size);
- // We do a jmp relative to the PC at the end of this instruction.
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
- (got_address + 8
- - (plt_address + 6)));
- elfcpp::Swap<32, false>::writeval(pov + 8,
- (got_address + 16
- - (plt_address + 12)));
- pov += plt_entry_size;
+ this->fill_first_plt_entry(pov, got_address, plt_address);
+ pov += this->get_plt_entry_size();
- unsigned char* got_pov = got_view;
+ // The first three entries in the GOT are reserved, and are written
+ // by Output_data_got_plt_x86_64::do_write.
+ unsigned char* got_pov = got_view + 24;
- memset(got_pov, 0, 24);
- got_pov += 24;
-
- unsigned int plt_offset = plt_entry_size;
+ unsigned int plt_offset = this->get_plt_entry_size();
unsigned int got_offset = 24;
- const unsigned int count = this->count_;
+ const unsigned int count = this->count_ + this->irelative_count_;
for (unsigned int plt_index = 0;
plt_index < count;
++plt_index,
- pov += plt_entry_size,
+ pov += this->get_plt_entry_size(),
got_pov += 8,
- plt_offset += plt_entry_size,
+ plt_offset += this->get_plt_entry_size(),
got_offset += 8)
{
// Set and adjust the PLT entry itself.
- memcpy(pov, plt_entry, plt_entry_size);
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
- (got_address + got_offset
- - (plt_address + plt_offset
- + 6)));
-
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
- elfcpp::Swap<32, false>::writeval(pov + 12,
- - (plt_offset + plt_entry_size));
+ unsigned int lazy_offset = this->fill_plt_entry(pov,
+ got_address, plt_address,
+ got_offset, plt_offset,
+ plt_index);
// Set the entry in the GOT.
- elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6);
+ elfcpp::Swap<64, false>::writeval(got_pov,
+ plt_address + plt_offset + lazy_offset);
}
if (this->has_tlsdesc_entry())
{
// Set and adjust the reserved TLSDESC PLT entry.
unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
- memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
- (got_address + 8
- - (plt_address + plt_offset
- + 6)));
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
- (got_base
- + tlsdesc_got_offset
- - (plt_address + plt_offset
- + 12)));
- pov += plt_entry_size;
+ this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
+ tlsdesc_got_offset, plt_offset);
+ pov += this->get_plt_entry_size();
}
gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
// Create the PLT section.
+template<int size>
void
-Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout)
+Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
{
if (this->plt_ == NULL)
{
// Create the GOT sections first.
this->got_section(symtab, layout);
- this->plt_ = new Output_data_plt_x86_64(layout, this->got_,
- this->got_plt_);
+ this->plt_ = this->make_data_plt(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_);
+ 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());
}
}
+// Return the section for TLSDESC relocations.
+
+template<int size>
+typename Target_x86_64<size>::Reloc_section*
+Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
+{
+ return this->plt_section()->rela_tlsdesc(layout);
+}
+
// Create a PLT entry for a global symbol.
+template<int size>
void
-Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout,
- Symbol* gsym)
+Target_x86_64<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(gsym);
+ this->plt_->add_entry(symtab, layout, gsym);
+}
+
+// Make a PLT entry for a local STT_GNU_IFUNC symbol.
+
+template<int size>
+void
+Target_x86_64<size>::make_local_ifunc_plt_entry(
+ Symbol_table* symtab, Layout* layout,
+ Sized_relobj_file<size, false>* 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_x86_64<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_x86_64<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_x86_64<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_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
+ Layout* layout,
+ unsigned int got_count,
+ unsigned int plt_count)
+{
+ gold_assert(this->got_ == NULL);
+
+ this->got_ = new Output_data_got<64, false>(got_count * 8);
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_, ORDER_RELRO_LAST,
+ true);
+
+ // Add the three reserved entries.
+ this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8);
+ layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_plt_, ORDER_NON_RELRO_FIRST,
+ false);
+
+ // 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);
+
+ // If there are any TLSDESC relocations, they get GOT entries in
+ // .got.plt after the jump slot entries.
+ // FIXME: Get the count for TLSDESC entries.
+ this->got_tlsdesc_ = new Output_data_got<64, false>(0);
+ layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->got_tlsdesc_,
+ ORDER_NON_RELRO_FIRST, false);
+
+ // If there are any IRELATIVE relocations, they get GOT entries in
+ // .got.plt after the jump slot and TLSDESC entries.
+ this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
+ layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->got_irelative_,
+ ORDER_NON_RELRO_FIRST, false);
+
+ // Create the PLT section.
+ this->plt_ = this->make_data_plt(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_x86_64<size>::reserve_local_got_entry(
+ unsigned int got_index,
+ Sized_relobj<size, false>* obj,
+ unsigned int r_sym,
+ unsigned int got_type)
+{
+ unsigned int got_offset = got_index * 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_X86_64_RELATIVE,
+ this->got_, got_offset, 0, false);
+ break;
+ case GOT_TYPE_TLS_OFFSET:
+ rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
+ 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_X86_64_DTPMOD64,
+ this->got_, got_offset, 0);
+ break;
+ case GOT_TYPE_TLS_DESC:
+ gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
+ // this->got_->reserve_slot(got_index + 1);
+ // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
+ // 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_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
+ Symbol* gsym,
+ unsigned int got_type)
+{
+ unsigned int got_offset = got_index * 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_X86_64_GLOB_DAT,
+ this->got_, got_offset, 0);
+ else
+ rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
+ this->got_, got_offset, 0, false);
+ }
+ break;
+ case GOT_TYPE_TLS_OFFSET:
+ rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
+ 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_X86_64_DTPMOD64,
+ this->got_, got_offset, 0, false);
+ rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
+ this->got_, got_offset + 8, 0, false);
+ break;
+ case GOT_TYPE_TLS_DESC:
+ this->got_->reserve_slot(got_index + 1);
+ rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
+ this->got_, got_offset, 0, false);
+ break;
+ default:
+ gold_unreachable();
+ }
+}
+
+// Register an existing PLT entry for a global symbol.
+
+template<int size>
+void
+Target_x86_64<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) * 8;
+ this->plt_->add_relocation(symtab, layout, gsym, got_offset);
+}
+
+// Force a COPY relocation for a given symbol.
+
+template<int size>
+void
+Target_x86_64<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));
}
// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
+template<int size>
void
-Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout)
+Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
+ Layout* layout)
{
if (this->tls_base_symbol_defined_)
return;
{
bool is_exec = parameters->options().output_is_executable();
symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
+ Symbol_table::PREDEFINED,
tls_segment, 0, 0,
elfcpp::STT_TLS,
elfcpp::STB_LOCAL,
// Create the reserved PLT and GOT entries for the TLS descriptor resolver.
+template<int size>
void
-Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab,
- Layout* layout)
+Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
+ Layout* layout)
{
if (this->plt_ == NULL)
this->make_plt_section(symtab, layout);
// Create a GOT entry for the TLS module index.
+template<int size>
unsigned int
-Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
- Sized_relobj<64, false>* object)
+Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
+ Sized_relobj_file<size, false>* object)
{
if (this->got_mod_index_offset_ == -1U)
{
Output_data_got<64, false>* got = this->got_section(symtab, layout);
unsigned int got_offset = got->add_constant(0);
rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
- got_offset, 0);
+ got_offset, 0);
got->add_constant(0);
this->got_mod_index_offset_ = got_offset;
}
// symbol. IS_FINAL is true if the final address of this symbol is
// known at link time.
+template<int size>
tls::Tls_optimization
-Target_x86_64::optimize_tls_reloc(bool is_final, int r_type)
+Target_x86_64<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.
}
}
+// Get the Reference_flags for a particular relocation.
+
+template<int size>
+int
+Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
+{
+ switch (r_type)
+ {
+ case elfcpp::R_X86_64_NONE:
+ case elfcpp::R_X86_64_GNU_VTINHERIT:
+ case elfcpp::R_X86_64_GNU_VTENTRY:
+ case elfcpp::R_X86_64_GOTPC32:
+ case elfcpp::R_X86_64_GOTPC64:
+ // No symbol reference.
+ return 0;
+
+ case elfcpp::R_X86_64_64:
+ case elfcpp::R_X86_64_32:
+ case elfcpp::R_X86_64_32S:
+ case elfcpp::R_X86_64_16:
+ case elfcpp::R_X86_64_8:
+ return Symbol::ABSOLUTE_REF;
+
+ case elfcpp::R_X86_64_PC64:
+ case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
+ case elfcpp::R_X86_64_PC16:
+ case elfcpp::R_X86_64_PC8:
+ case elfcpp::R_X86_64_GOTOFF64:
+ return Symbol::RELATIVE_REF;
+
+ case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
+ case elfcpp::R_X86_64_PLTOFF64:
+ return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
+
+ case elfcpp::R_X86_64_GOT64:
+ case elfcpp::R_X86_64_GOT32:
+ case elfcpp::R_X86_64_GOTPCREL64:
+ case elfcpp::R_X86_64_GOTPCREL:
+ case elfcpp::R_X86_64_GOTPLT64:
+ // Absolute in GOT.
+ return Symbol::ABSOLUTE_REF;
+
+ case elfcpp::R_X86_64_TLSGD: // Global-dynamic
+ case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
+ case elfcpp::R_X86_64_TLSDESC_CALL:
+ case elfcpp::R_X86_64_TLSLD: // Local-dynamic
+ case elfcpp::R_X86_64_DTPOFF32:
+ case elfcpp::R_X86_64_DTPOFF64:
+ case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
+ case elfcpp::R_X86_64_TPOFF32: // Local-exec
+ return Symbol::TLS_REF;
+
+ case elfcpp::R_X86_64_COPY:
+ case elfcpp::R_X86_64_GLOB_DAT:
+ case elfcpp::R_X86_64_JUMP_SLOT:
+ case elfcpp::R_X86_64_RELATIVE:
+ case elfcpp::R_X86_64_IRELATIVE:
+ case elfcpp::R_X86_64_TPOFF64:
+ case elfcpp::R_X86_64_DTPMOD64:
+ case elfcpp::R_X86_64_TLSDESC:
+ case elfcpp::R_X86_64_SIZE32:
+ case elfcpp::R_X86_64_SIZE64:
+ default:
+ // Not expected. We will give an error later.
+ return 0;
+ }
+}
+
// Report an unsupported relocation against a local symbol.
+template<int size>
void
-Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object,
- unsigned int r_type)
+Target_x86_64<size>::Scan::unsupported_reloc_local(
+ Sized_relobj_file<size, false>* object,
+ unsigned int r_type)
{
gold_error(_("%s: unsupported reloc %u against local symbol"),
object->name().c_str(), r_type);
// Here we know the section is allocated, but we don't know that it is
// read-only. But we check for all the relocation types which the
// glibc dynamic linker supports, so it seems appropriate to issue an
-// error even if the section is not read-only.
+// error even if the section is not read-only. If GSYM is not NULL,
+// it is the symbol the relocation is against; if it is NULL, the
+// relocation is against a local symbol.
+template<int size>
void
-Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type)
+Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
+ Symbol* gsym)
{
switch (r_type)
{
- // These are the relocation types supported by glibc for x86_64.
+ // These are the relocation types supported by glibc for x86_64
+ // which should always work.
case elfcpp::R_X86_64_RELATIVE:
+ case elfcpp::R_X86_64_IRELATIVE:
case elfcpp::R_X86_64_GLOB_DAT:
case elfcpp::R_X86_64_JUMP_SLOT:
case elfcpp::R_X86_64_DTPMOD64:
case elfcpp::R_X86_64_DTPOFF64:
case elfcpp::R_X86_64_TPOFF64:
case elfcpp::R_X86_64_64:
- case elfcpp::R_X86_64_32:
- case elfcpp::R_X86_64_PC32:
case elfcpp::R_X86_64_COPY:
return;
+ // glibc supports these reloc types, but they can overflow.
+ case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
+ // A PC relative reference is OK against a local symbol or if
+ // the symbol is defined locally.
+ if (gsym == NULL
+ || (!gsym->is_from_dynobj()
+ && !gsym->is_undefined()
+ && !gsym->is_preemptible()))
+ return;
+ /* Fall through. */
+ case elfcpp::R_X86_64_32:
+ // R_X86_64_32 is OK for x32.
+ if (size == 32 && r_type == elfcpp::R_X86_64_32)
+ return;
+ if (this->issued_non_pic_error_)
+ return;
+ gold_assert(parameters->options().output_is_position_independent());
+ if (gsym == NULL)
+ object->error(_("requires dynamic R_X86_64_32 reloc which may "
+ "overflow at runtime; recompile with -fPIC"));
+ else
+ {
+ const char *r_name;
+ switch (r_type)
+ {
+ case elfcpp::R_X86_64_32:
+ r_name = "R_X86_64_32";
+ break;
+ case elfcpp::R_X86_64_PC32:
+ r_name = "R_X86_64_PC32";
+ break;
+ case elfcpp::R_X86_64_PC32_BND:
+ r_name = "R_X86_64_PC32_BND";
+ break;
+ default:
+ gold_unreachable();
+ break;
+ }
+ object->error(_("requires dynamic %s reloc against '%s' "
+ "which may overflow at runtime; recompile "
+ "with -fPIC"),
+ r_name, gsym->name());
+ }
+ this->issued_non_pic_error_ = true;
+ return;
+
default:
// This prevents us from issuing more than one error per reloc
// section. But we can still wind up issuing more than one
// error per object file.
if (this->issued_non_pic_error_)
- return;
- object->error(_("requires unsupported dynamic reloc; "
- "recompile with -fPIC"));
+ return;
+ gold_assert(parameters->options().output_is_position_independent());
+ object->error(_("requires unsupported dynamic reloc %u; "
+ "recompile with -fPIC"),
+ r_type);
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_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
+ Sized_relobj_file<size, false>* 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_x86_64::Scan::local(const General_options&,
- Symbol_table* symtab,
- Layout* layout,
- Target_x86_64* target,
- Sized_relobj<64, false>* object,
- unsigned int data_shndx,
- Output_section* output_section,
- const elfcpp::Rela<64, false>& reloc,
- unsigned int r_type,
- const elfcpp::Sym<64, false>& lsym)
+Target_x86_64<size>::Scan::local(Symbol_table* symtab,
+ Layout* layout,
+ Target_x86_64<size>* target,
+ Sized_relobj_file<size, false>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, false>& reloc,
+ unsigned int r_type,
+ const elfcpp::Sym<size, false>& 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_X86_64_NONE:
- case elfcpp::R_386_GNU_VTINHERIT:
- case elfcpp::R_386_GNU_VTENTRY:
+ case elfcpp::R_X86_64_GNU_VTINHERIT:
+ case elfcpp::R_X86_64_GNU_VTENTRY:
break;
case elfcpp::R_X86_64_64:
// R_X86_64_RELATIVE relocation so the dynamic loader can
// relocate it easily.
if (parameters->options().output_is_position_independent())
- {
- unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- rela_dyn->add_local_relative(object, r_sym,
- elfcpp::R_X86_64_RELATIVE,
- output_section, data_shndx,
- reloc.get_r_offset(),
- reloc.get_r_addend());
- }
+ {
+ 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,
+ (size == 32
+ ? elfcpp::R_X86_64_RELATIVE64
+ : elfcpp::R_X86_64_RELATIVE),
+ output_section, data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend(), is_ifunc);
+ }
break;
case elfcpp::R_X86_64_32:
// location. We can't use an R_X86_64_RELATIVE relocation
// because that is always a 64-bit relocation.
if (parameters->options().output_is_position_independent())
- {
- this->check_non_pic(object, r_type);
+ {
+ // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
+ if (size == 32 && r_type == elfcpp::R_X86_64_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_X86_64_RELATIVE,
+ output_section, data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend(), is_ifunc);
+ break;
+ }
+
+ this->check_non_pic(object, r_type, NULL);
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
- if (lsym.get_st_type() != elfcpp::STT_SECTION)
+ 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);
+ 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,
r_type, output_section,
data_shndx, reloc.get_r_offset(),
reloc.get_r_addend());
- }
- }
+ }
+ }
break;
case elfcpp::R_X86_64_PC64:
case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
case elfcpp::R_X86_64_PC16:
case elfcpp::R_X86_64_PC8:
break;
case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
// Since we know this is a local symbol, we can handle this as a
// PC32 reloc.
break;
case elfcpp::R_X86_64_GOTPCREL:
case elfcpp::R_X86_64_GOTPLT64:
{
- // The symbol requires a GOT entry.
- Output_data_got<64, false>* got = target->got_section(symtab, layout);
- unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
- if (got->add_local(object, r_sym, GOT_TYPE_STANDARD))
- {
- // 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);
+ // The symbol requires a GOT entry.
+ Output_data_got<64, false>* got = target->got_section(symtab, layout);
+ 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);
// R_X86_64_RELATIVE assumes a 64-bit relocation.
if (r_type != elfcpp::R_X86_64_GOT32)
- rela_dyn->add_local_relative(
- object, r_sym, elfcpp::R_X86_64_RELATIVE, got,
- object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
- else
- {
- this->check_non_pic(object, r_type);
-
- gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
- rela_dyn->add_local(
- object, r_sym, r_type, got,
- object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
- }
- }
- }
- // For GOTPLT64, we'd normally want a PLT section, but since
- // we know this is a local symbol, no PLT is needed.
+ {
+ unsigned int got_offset =
+ object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
+ rela_dyn->add_local_relative(object, r_sym,
+ elfcpp::R_X86_64_RELATIVE,
+ got, got_offset, 0, is_ifunc);
+ }
+ else
+ {
+ this->check_non_pic(object, r_type, NULL);
+
+ gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
+ rela_dyn->add_local(
+ object, r_sym, r_type, got,
+ object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
+ }
+ }
+ }
+ // For GOTPLT64, we'd normally want a PLT section, but since
+ // we know this is a local symbol, no PLT is needed.
}
break;
case elfcpp::R_X86_64_GLOB_DAT:
case elfcpp::R_X86_64_JUMP_SLOT:
case elfcpp::R_X86_64_RELATIVE:
+ case elfcpp::R_X86_64_IRELATIVE:
// These are outstanding tls relocs, which are unexpected when linking
case elfcpp::R_X86_64_TPOFF64:
case elfcpp::R_X86_64_DTPMOD64:
{
bool output_is_shared = parameters->options().shared();
const tls::Tls_optimization optimized_type
- = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type);
+ = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
+ r_type);
switch (r_type)
{
- case elfcpp::R_X86_64_TLSGD: // General-dynamic
- if (optimized_type == tls::TLSOPT_NONE)
- {
- // Create a pair of GOT entries for the module index and
- // dtv-relative offset.
- Output_data_got<64, false>* got
- = target->got_section(symtab, layout);
- unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
+ case elfcpp::R_X86_64_TLSGD: // General-dynamic
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a pair of GOT entries for the module index and
+ // dtv-relative offset.
+ Output_data_got<64, false>* 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_rela(object, r_sym,
- shndx,
- GOT_TYPE_TLS_PAIR,
- target->rela_dyn_section(layout),
- elfcpp::R_X86_64_DTPMOD64, 0);
- }
- else if (optimized_type != tls::TLSOPT_TO_LE)
+ else
+ got->add_local_pair_with_rel(object, r_sym,
+ shndx,
+ GOT_TYPE_TLS_PAIR,
+ target->rela_dyn_section(layout),
+ elfcpp::R_X86_64_DTPMOD64);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
unsupported_reloc_local(object, r_type);
- break;
+ break;
- case elfcpp::R_X86_64_GOTPC32_TLSDESC:
- target->define_tls_base_symbol(symtab, layout);
+ case elfcpp::R_X86_64_GOTPC32_TLSDESC:
+ target->define_tls_base_symbol(symtab, layout);
if (optimized_type == tls::TLSOPT_NONE)
{
- // Create reserved PLT and GOT entries for the resolver.
- target->reserve_tlsdesc_entries(symtab, layout);
-
- // Generate a double GOT entry with an R_X86_64_TLSDESC reloc.
- Output_data_got<64, false>* got
- = target->got_section(symtab, layout);
- unsigned int r_sym = elfcpp::elf_r_sym<64>(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_rela(object, r_sym,
- shndx,
- GOT_TYPE_TLS_DESC,
- target->rela_dyn_section(layout),
- elfcpp::R_X86_64_TLSDESC, 0);
+ // Create reserved PLT and GOT entries for the resolver.
+ target->reserve_tlsdesc_entries(symtab, layout);
+
+ // Generate a double GOT entry with an
+ // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc
+ // is resolved lazily, so the GOT entry needs to be in
+ // an area in .got.plt, not .got. Call got_section to
+ // make sure the section has been created.
+ target->got_section(symtab, layout);
+ Output_data_got<64, false>* got = target->got_tlsdesc_section();
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
+ {
+ unsigned int got_offset = got->add_constant(0);
+ got->add_constant(0);
+ object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
+ got_offset);
+ Reloc_section* rt = target->rela_tlsdesc_section(layout);
+ // We store the arguments we need in a vector, and
+ // use the index into the vector as the parameter
+ // to pass to the target specific routines.
+ uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
+ void* arg = reinterpret_cast<void*>(intarg);
+ rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
+ got, got_offset, 0);
+ }
}
else if (optimized_type != tls::TLSOPT_TO_LE)
unsupported_reloc_local(object, r_type);
break;
- case elfcpp::R_X86_64_TLSDESC_CALL:
+ case elfcpp::R_X86_64_TLSDESC_CALL:
break;
- case elfcpp::R_X86_64_TLSLD: // Local-dynamic
+ case elfcpp::R_X86_64_TLSLD: // Local-dynamic
if (optimized_type == tls::TLSOPT_NONE)
{
- // Create a GOT entry for the module index.
- target->got_mod_index_entry(symtab, layout, object);
+ // 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_X86_64_DTPOFF32:
- case elfcpp::R_X86_64_DTPOFF64:
+ case elfcpp::R_X86_64_DTPOFF32:
+ case elfcpp::R_X86_64_DTPOFF64:
break;
- case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
+ case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
layout->set_has_static_tls();
- if (optimized_type == tls::TLSOPT_NONE)
- {
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<64, false>* got
- = target->got_section(symtab, layout);
- unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
- got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET,
- target->rela_dyn_section(layout),
- elfcpp::R_X86_64_TPOFF64);
- }
- else if (optimized_type != tls::TLSOPT_TO_LE)
- unsupported_reloc_local(object, r_type);
- break;
-
- case elfcpp::R_X86_64_TPOFF32: // Local-exec
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<64, false>* 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_X86_64_TPOFF64);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_local(object, r_type);
+ break;
+
+ case elfcpp::R_X86_64_TPOFF32: // Local-exec
layout->set_has_static_tls();
- if (output_is_shared)
- unsupported_reloc_local(object, r_type);
+ if (output_is_shared)
+ unsupported_reloc_local(object, r_type);
break;
- default:
- gold_unreachable();
+ default:
+ gold_unreachable();
}
}
break;
// Report an unsupported relocation against a global symbol.
+template<int size>
void
-Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object,
- unsigned int r_type,
- Symbol* gsym)
+Target_x86_64<size>::Scan::unsupported_reloc_global(
+ Sized_relobj_file<size, false>* 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_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
+{
+ switch (r_type)
+ {
+ case elfcpp::R_X86_64_64:
+ case elfcpp::R_X86_64_32:
+ case elfcpp::R_X86_64_32S:
+ case elfcpp::R_X86_64_16:
+ case elfcpp::R_X86_64_8:
+ case elfcpp::R_X86_64_GOT64:
+ case elfcpp::R_X86_64_GOT32:
+ case elfcpp::R_X86_64_GOTPCREL64:
+ case elfcpp::R_X86_64_GOTPCREL:
+ case elfcpp::R_X86_64_GOTPLT64:
+ {
+ 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_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
+ Symbol_table* ,
+ Layout* ,
+ Target_x86_64<size>* ,
+ Sized_relobj_file<size, false>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, false>& ,
+ unsigned int r_type,
+ const elfcpp::Sym<size, false>&)
+{
+ // When building a shared library, do not fold any local symbols as it is
+ // not possible to distinguish pointer taken versus a call by looking at
+ // the relocation types.
+ 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_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
+ Symbol_table*,
+ Layout* ,
+ Target_x86_64<size>* ,
+ Sized_relobj_file<size, false>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, false>& ,
+ 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));
+}
+
// Scan a relocation for a global symbol.
+template<int size>
inline void
-Target_x86_64::Scan::global(const General_options&,
- Symbol_table* symtab,
- Layout* layout,
- Target_x86_64* target,
- Sized_relobj<64, false>* object,
- unsigned int data_shndx,
- Output_section* output_section,
- const elfcpp::Rela<64, false>& reloc,
- unsigned int r_type,
- Symbol* gsym)
+Target_x86_64<size>::Scan::global(Symbol_table* symtab,
+ Layout* layout,
+ Target_x86_64<size>* target,
+ Sized_relobj_file<size, false>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, false>& 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_X86_64_NONE:
- case elfcpp::R_386_GNU_VTINHERIT:
- case elfcpp::R_386_GNU_VTENTRY:
+ case elfcpp::R_X86_64_GNU_VTINHERIT:
+ case elfcpp::R_X86_64_GNU_VTENTRY:
break;
case elfcpp::R_X86_64_64:
case elfcpp::R_X86_64_16:
case elfcpp::R_X86_64_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(Symbol::ABSOLUTE_REF))
- {
- if (target->may_need_copy_reloc(gsym))
- {
- target->copy_reloc(symtab, layout, object,
- data_shndx, output_section, gsym, reloc);
- }
- else if (r_type == elfcpp::R_X86_64_64
- && gsym->can_use_relative_reloc(false))
- {
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
- output_section, object,
- data_shndx, reloc.get_r_offset(),
- reloc.get_r_addend());
- }
- else
- {
- this->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());
- }
- }
+ // 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_X86_64_64)
+ || (size == 32 && r_type == elfcpp::R_X86_64_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_X86_64_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_X86_64_64)
+ || (size == 32 && r_type == elfcpp::R_X86_64_32))
+ && gsym->can_use_relative_reloc(false))
+ {
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
+ output_section, object,
+ data_shndx,
+ reloc.get_r_offset(),
+ reloc.get_r_addend(), false);
+ }
+ else
+ {
+ this->check_non_pic(object, r_type, gsym);
+ 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_X86_64_PC64:
case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
case elfcpp::R_X86_64_PC16:
case elfcpp::R_X86_64_PC8:
{
- // Make a PLT entry if necessary.
- if (gsym->needs_plt_entry())
- target->make_plt_entry(symtab, layout, gsym);
- // Make a dynamic relocation if necessary.
- int flags = Symbol::NON_PIC_REF;
- if (gsym->type() == elfcpp::STT_FUNC)
- flags |= Symbol::FUNCTION_CALL;
- if (gsym->needs_dynamic_reloc(flags))
- {
- if (target->may_need_copy_reloc(gsym))
- {
- target->copy_reloc(symtab, layout, object,
- data_shndx, output_section, gsym, reloc);
- }
- else
- {
- this->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());
- }
- }
+ // Make a PLT entry if necessary.
+ if (gsym->needs_plt_entry())
+ target->make_plt_entry(symtab, layout, gsym);
+ // 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
+ {
+ this->check_non_pic(object, r_type, gsym);
+ 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_X86_64_GOTPCREL:
case elfcpp::R_X86_64_GOTPLT64:
{
- // The symbol requires a GOT entry.
- Output_data_got<64, false>* got = target->got_section(symtab, layout);
- if (gsym->final_value_is_known())
- got->add_global(gsym, GOT_TYPE_STANDARD);
- else
- {
- // If this symbol is not fully resolved, we need to add a
- // dynamic relocation for it.
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- if (gsym->is_from_dynobj()
- || gsym->is_undefined()
- || gsym->is_preemptible())
- got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
- elfcpp::R_X86_64_GLOB_DAT);
- else
- {
- if (got->add_global(gsym, GOT_TYPE_STANDARD))
- rela_dyn->add_global_relative(
- gsym, elfcpp::R_X86_64_RELATIVE, got,
- gsym->got_offset(GOT_TYPE_STANDARD), 0);
- }
- }
- // For GOTPLT64, we also need a PLT entry (but only if the
- // symbol is not fully resolved).
- if (r_type == elfcpp::R_X86_64_GOTPLT64
- && !gsym->final_value_is_known())
- target->make_plt_entry(symtab, layout, gsym);
+ // The symbol requires a GOT entry.
+ Output_data_got<64, false>* 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_X86_64_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_X86_64_RELATIVE,
+ got, got_off, 0, false);
+ }
+ }
+ }
+ // For GOTPLT64, we also need a PLT entry (but only if the
+ // symbol is not fully resolved).
+ if (r_type == elfcpp::R_X86_64_GOTPLT64
+ && !gsym->final_value_is_known())
+ target->make_plt_entry(symtab, layout, gsym);
}
break;
case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
// If the symbol is fully resolved, this is just a PC32 reloc.
// Otherwise we need a PLT entry.
if (gsym->final_value_is_known())
// 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())
+ && !gsym->is_from_dynobj()
+ && !gsym->is_preemptible())
break;
target->make_plt_entry(symtab, layout, gsym);
break;
case elfcpp::R_X86_64_GLOB_DAT:
case elfcpp::R_X86_64_JUMP_SLOT:
case elfcpp::R_X86_64_RELATIVE:
+ case elfcpp::R_X86_64_IRELATIVE:
// These are outstanding tls relocs, which are unexpected when linking
case elfcpp::R_X86_64_TPOFF64:
case elfcpp::R_X86_64_DTPMOD64:
{
const bool is_final = gsym->final_value_is_known();
const tls::Tls_optimization optimized_type
- = Target_x86_64::optimize_tls_reloc(is_final, r_type);
+ = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
switch (r_type)
{
- case elfcpp::R_X86_64_TLSGD: // General-dynamic
+ case elfcpp::R_X86_64_TLSGD: // General-dynamic
if (optimized_type == tls::TLSOPT_NONE)
{
- // Create a pair of GOT entries for the module index and
- // dtv-relative offset.
- Output_data_got<64, false>* got
- = target->got_section(symtab, layout);
- got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR,
- target->rela_dyn_section(layout),
- elfcpp::R_X86_64_DTPMOD64,
- elfcpp::R_X86_64_DTPOFF64);
+ // Create a pair of GOT entries for the module index and
+ // dtv-relative offset.
+ Output_data_got<64, false>* got
+ = target->got_section(symtab, layout);
+ got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
+ target->rela_dyn_section(layout),
+ elfcpp::R_X86_64_DTPMOD64,
+ elfcpp::R_X86_64_DTPOFF64);
}
else if (optimized_type == tls::TLSOPT_TO_IE)
{
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<64, false>* got
- = target->got_section(symtab, layout);
- got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET,
- target->rela_dyn_section(layout),
- elfcpp::R_X86_64_TPOFF64);
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<64, false>* got
+ = target->got_section(symtab, layout);
+ got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
+ target->rela_dyn_section(layout),
+ elfcpp::R_X86_64_TPOFF64);
}
else if (optimized_type != tls::TLSOPT_TO_LE)
unsupported_reloc_global(object, r_type, gsym);
break;
- case elfcpp::R_X86_64_GOTPC32_TLSDESC:
- target->define_tls_base_symbol(symtab, layout);
+ case elfcpp::R_X86_64_GOTPC32_TLSDESC:
+ target->define_tls_base_symbol(symtab, layout);
if (optimized_type == tls::TLSOPT_NONE)
{
- // Create reserved PLT and GOT entries for the resolver.
- target->reserve_tlsdesc_entries(symtab, layout);
-
- // Create a double GOT entry with an R_X86_64_TLSDESC reloc.
- Output_data_got<64, false>* got
- = target->got_section(symtab, layout);
- got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC,
- target->rela_dyn_section(layout),
- elfcpp::R_X86_64_TLSDESC, 0);
+ // Create reserved PLT and GOT entries for the resolver.
+ target->reserve_tlsdesc_entries(symtab, layout);
+
+ // Create a double GOT entry with an R_X86_64_TLSDESC
+ // reloc. The R_X86_64_TLSDESC reloc is resolved
+ // lazily, so the GOT entry needs to be in an area in
+ // .got.plt, not .got. Call got_section to make sure
+ // the section has been created.
+ target->got_section(symtab, layout);
+ Output_data_got<64, false>* got = target->got_tlsdesc_section();
+ Reloc_section* rt = target->rela_tlsdesc_section(layout);
+ got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
+ elfcpp::R_X86_64_TLSDESC, 0);
}
else if (optimized_type == tls::TLSOPT_TO_IE)
{
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<64, false>* got
- = target->got_section(symtab, layout);
- got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET,
- target->rela_dyn_section(layout),
- elfcpp::R_X86_64_TPOFF64);
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<64, false>* got
+ = target->got_section(symtab, layout);
+ got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
+ target->rela_dyn_section(layout),
+ elfcpp::R_X86_64_TPOFF64);
}
else if (optimized_type != tls::TLSOPT_TO_LE)
unsupported_reloc_global(object, r_type, gsym);
break;
- case elfcpp::R_X86_64_TLSDESC_CALL:
+ case elfcpp::R_X86_64_TLSDESC_CALL:
break;
- case elfcpp::R_X86_64_TLSLD: // Local-dynamic
+ case elfcpp::R_X86_64_TLSLD: // Local-dynamic
if (optimized_type == tls::TLSOPT_NONE)
{
- // Create a GOT entry for the module index.
- target->got_mod_index_entry(symtab, layout, object);
+ // 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_X86_64_DTPOFF32:
- case elfcpp::R_X86_64_DTPOFF64:
+ case elfcpp::R_X86_64_DTPOFF32:
+ case elfcpp::R_X86_64_DTPOFF64:
break;
- case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
+ case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
layout->set_has_static_tls();
- if (optimized_type == tls::TLSOPT_NONE)
- {
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<64, false>* got
- = target->got_section(symtab, layout);
- got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET,
- target->rela_dyn_section(layout),
- elfcpp::R_X86_64_TPOFF64);
- }
- else if (optimized_type != tls::TLSOPT_TO_LE)
- unsupported_reloc_global(object, r_type, gsym);
- break;
-
- case elfcpp::R_X86_64_TPOFF32: // Local-exec
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<64, false>* got
+ = target->got_section(symtab, layout);
+ got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
+ target->rela_dyn_section(layout),
+ elfcpp::R_X86_64_TPOFF64);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_global(object, r_type, gsym);
+ break;
+
+ case elfcpp::R_X86_64_TPOFF32: // Local-exec
layout->set_has_static_tls();
- if (parameters->options().shared())
- unsupported_reloc_local(object, r_type);
+ if (parameters->options().shared())
+ unsupported_reloc_global(object, r_type, gsym);
break;
- default:
- gold_unreachable();
+ 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());
+ gsym->demangled_name().c_str());
break;
}
}
+template<int size>
+void
+Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, false>* 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, false, Target_x86_64<size>, elfcpp::SHT_RELA,
+ typename Target_x86_64<size>::Scan,
+ typename Target_x86_64<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);
+
+}
// Scan relocations for a section.
+template<int size>
void
-Target_x86_64::scan_relocs(const General_options& options,
- Symbol_table* symtab,
- Layout* layout,
- Sized_relobj<64, false>* 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)
+Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, false>* 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::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA,
- Target_x86_64::Scan>(
- options,
+ gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
+ typename Target_x86_64<size>::Scan>(
symtab,
layout,
this,
// Finalize the sections.
+template<int size>
void
-Target_x86_64::do_finalize_sections(Layout* layout)
+Target_x86_64<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, false);
+
// Fill in some more dynamic tags.
Output_data_dynamic* const odyn = layout->dynamic_data();
if (odyn != NULL)
{
- if (this->got_plt_ != NULL)
- odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_);
-
- if (this->plt_ != NULL)
- {
- const Output_data* od = this->plt_->rel_plt();
- odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
- odyn->add_section_address(elfcpp::DT_JMPREL, od);
- odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA);
- if (this->plt_->has_tlsdesc_entry())
- {
- unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
- unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
- this->got_->finalize_data_size();
- odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
- this->plt_, plt_offset);
- odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
- this->got_, got_offset);
- }
- }
-
- if (this->rela_dyn_ != NULL)
- {
- const Output_data* od = this->rela_dyn_;
- odyn->add_section_address(elfcpp::DT_RELA, od);
- odyn->add_section_size(elfcpp::DT_RELASZ, od);
- odyn->add_constant(elfcpp::DT_RELAENT,
- elfcpp::Elf_sizes<64>::rela_size);
- }
-
- if (!parameters->options().shared())
+ if (this->plt_ != NULL
+ && this->plt_->output_section() != NULL
+ && this->plt_->has_tlsdesc_entry())
{
- // The value of the DT_DEBUG tag is filled in by the dynamic
- // linker at run time, and used by the debugger.
- odyn->add_constant(elfcpp::DT_DEBUG, 0);
+ unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
+ unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
+ this->got_->finalize_data_size();
+ odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
+ this->plt_, plt_offset);
+ odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
+ this->got_, got_offset);
}
}
// 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.plt section.
+ Symbol* sym = this->global_offset_table_;
+ if (sym != NULL)
+ {
+ uint64_t data_size = this->got_plt_->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());
+ }
}
// Perform a relocation.
+template<int size>
inline bool
-Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
- Target_x86_64* target,
- size_t relnum,
- const elfcpp::Rela<64, false>& rela,
- unsigned int r_type,
- const Sized_symbol<64>* gsym,
- const Symbol_value<64>* psymval,
- unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr address,
- section_size_type view_size)
+Target_x86_64<size>::Relocate::relocate(
+ const Relocate_info<size, false>* relinfo,
+ Target_x86_64<size>* target,
+ Output_section*,
+ size_t relnum,
+ const elfcpp::Rela<size, false>& 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 (this->skip_call_tls_get_addr_)
{
- if (r_type != elfcpp::R_X86_64_PLT32
+ if ((r_type != elfcpp::R_X86_64_PLT32
+ && r_type != elfcpp::R_X86_64_PLT32_BND
+ && r_type != elfcpp::R_X86_64_PC32_BND
+ && r_type != elfcpp::R_X86_64_PC32)
|| gsym == NULL
|| strcmp(gsym->name(), "__tls_get_addr") != 0)
{
}
}
- // Pick the value to use for symbols defined in shared objects.
- Symbol_value<64> symval;
+ if (view == NULL)
+ return true;
+
+ const Sized_relobj_file<size, false>* 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(r_type == elfcpp::R_X86_64_PC64
- || r_type == elfcpp::R_X86_64_PC32
- || r_type == elfcpp::R_X86_64_PC16
- || r_type == elfcpp::R_X86_64_PC8))
+ && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
{
- symval.set_output_value(target->plt_section()->address()
- + gsym->plt_offset());
+ 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 Sized_relobj<64, false>* object = relinfo->object;
const elfcpp::Elf_Xword addend = rela.get_r_addend();
// Get the GOT offset if needed.
// We need to subtract the size of the GOT section to get
// the actual offset to use in the relocation.
bool have_got_offset = false;
- unsigned int got_offset = 0;
+ // Since the actual offset is always negative, we use signed int to
+ // support 64-bit GOT relocations.
+ int got_offset = 0;
switch (r_type)
{
case elfcpp::R_X86_64_GOT32:
case elfcpp::R_X86_64_GOTPCREL:
case elfcpp::R_X86_64_GOTPCREL64:
if (gsym != NULL)
- {
- gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
- got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
- }
+ {
+ gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
+ got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
+ }
else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<64>(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)
- - target->got_size());
- }
+ {
+ 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)
+ - target->got_size());
+ }
have_got_offset = true;
break;
switch (r_type)
{
case elfcpp::R_X86_64_NONE:
- case elfcpp::R_386_GNU_VTINHERIT:
- case elfcpp::R_386_GNU_VTENTRY:
+ case elfcpp::R_X86_64_GNU_VTINHERIT:
+ case elfcpp::R_X86_64_GNU_VTENTRY:
break;
case elfcpp::R_X86_64_64:
- Relocate_functions<64, false>::rela64(view, object, psymval, addend);
+ Relocate_functions<size, false>::rela64(view, object, psymval, addend);
break;
case elfcpp::R_X86_64_PC64:
- Relocate_functions<64, false>::pcrela64(view, object, psymval, addend,
- address);
+ Relocate_functions<size, false>::pcrela64(view, object, psymval, addend,
+ address);
break;
case elfcpp::R_X86_64_32:
// uint64_t x = value + addend;
// x == static_cast<uint64_t>(static_cast<uint32_t>(x))
// Likewise for other <=32-bit relocations (but see R_X86_64_32S).
- Relocate_functions<64, false>::rela32(view, object, psymval, addend);
+ Relocate_functions<size, false>::rela32(view, object, psymval, addend);
break;
case elfcpp::R_X86_64_32S:
// FIXME: we need to verify that value + addend fits into 32 bits:
// int64_t x = value + addend; // note this quantity is signed!
// x == static_cast<int64_t>(static_cast<int32_t>(x))
- Relocate_functions<64, false>::rela32(view, object, psymval, addend);
+ Relocate_functions<size, false>::rela32(view, object, psymval, addend);
break;
case elfcpp::R_X86_64_PC32:
- Relocate_functions<64, false>::pcrela32(view, object, psymval, addend,
- address);
+ case elfcpp::R_X86_64_PC32_BND:
+ Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
+ address);
break;
case elfcpp::R_X86_64_16:
- Relocate_functions<64, false>::rela16(view, object, psymval, addend);
+ Relocate_functions<size, false>::rela16(view, object, psymval, addend);
break;
case elfcpp::R_X86_64_PC16:
- Relocate_functions<64, false>::pcrela16(view, object, psymval, addend,
- address);
+ Relocate_functions<size, false>::pcrela16(view, object, psymval, addend,
+ address);
break;
case elfcpp::R_X86_64_8:
- Relocate_functions<64, false>::rela8(view, object, psymval, addend);
+ Relocate_functions<size, false>::rela8(view, object, psymval, addend);
break;
case elfcpp::R_X86_64_PC8:
- Relocate_functions<64, false>::pcrela8(view, object, psymval, addend,
- address);
+ Relocate_functions<size, false>::pcrela8(view, object, psymval, addend,
+ address);
break;
case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
gold_assert(gsym == NULL
- || gsym->has_plt_offset()
+ || gsym->has_plt_offset()
|| gsym->final_value_is_known()
|| (gsym->is_defined()
&& !gsym->is_from_dynobj()
// Note: while this code looks the same as for R_X86_64_PC32, it
// behaves differently because psymval was set to point to
// the PLT entry, rather than the symbol, in Scan::global().
- Relocate_functions<64, false>::pcrela32(view, object, psymval, addend,
- address);
+ Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
+ address);
break;
case elfcpp::R_X86_64_PLTOFF64:
{
- gold_assert(gsym);
- gold_assert(gsym->has_plt_offset()
- || gsym->final_value_is_known());
- elfcpp::Elf_types<64>::Elf_Addr got_address;
- got_address = target->got_section(NULL, NULL)->address();
- Relocate_functions<64, false>::rela64(view, object, psymval,
- addend - got_address);
+ gold_assert(gsym);
+ gold_assert(gsym->has_plt_offset()
+ || gsym->final_value_is_known());
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address;
+ // This is the address of GLOBAL_OFFSET_TABLE.
+ got_address = target->got_plt_section()->address();
+ Relocate_functions<size, false>::rela64(view, object, psymval,
+ addend - got_address);
}
+ break;
case elfcpp::R_X86_64_GOT32:
gold_assert(have_got_offset);
- Relocate_functions<64, false>::rela32(view, got_offset, addend);
+ Relocate_functions<size, false>::rela32(view, got_offset, addend);
break;
case elfcpp::R_X86_64_GOTPC32:
{
- gold_assert(gsym);
- elfcpp::Elf_types<64>::Elf_Addr value;
+ gold_assert(gsym);
+ typename elfcpp::Elf_types<size>::Elf_Addr value;
value = target->got_plt_section()->address();
- Relocate_functions<64, false>::pcrela32(view, value, addend, address);
+ Relocate_functions<size, false>::pcrela32(view, value, addend, address);
}
break;
// Since we always add a PLT entry, this is equivalent.
case elfcpp::R_X86_64_GOTPLT64:
gold_assert(have_got_offset);
- Relocate_functions<64, false>::rela64(view, got_offset, addend);
+ Relocate_functions<size, false>::rela64(view, got_offset, addend);
break;
case elfcpp::R_X86_64_GOTPC64:
{
- gold_assert(gsym);
- elfcpp::Elf_types<64>::Elf_Addr value;
+ gold_assert(gsym);
+ typename elfcpp::Elf_types<size>::Elf_Addr value;
value = target->got_plt_section()->address();
- Relocate_functions<64, false>::pcrela64(view, value, addend, address);
+ Relocate_functions<size, false>::pcrela64(view, value, addend, address);
}
break;
case elfcpp::R_X86_64_GOTOFF64:
{
- elfcpp::Elf_types<64>::Elf_Addr value;
+ typename elfcpp::Elf_types<size>::Elf_Addr value;
value = (psymval->value(object, 0)
- target->got_plt_section()->address());
- Relocate_functions<64, false>::rela64(view, value, addend);
+ Relocate_functions<size, false>::rela64(view, value, addend);
}
break;
case elfcpp::R_X86_64_GOTPCREL:
{
- gold_assert(have_got_offset);
- elfcpp::Elf_types<64>::Elf_Addr value;
- value = target->got_plt_section()->address() + got_offset;
- Relocate_functions<64, false>::pcrela32(view, value, addend, address);
+ gold_assert(have_got_offset);
+ typename elfcpp::Elf_types<size>::Elf_Addr value;
+ value = target->got_plt_section()->address() + got_offset;
+ Relocate_functions<size, false>::pcrela32(view, value, addend, address);
}
break;
case elfcpp::R_X86_64_GOTPCREL64:
{
- gold_assert(have_got_offset);
- elfcpp::Elf_types<64>::Elf_Addr value;
- value = target->got_plt_section()->address() + got_offset;
- Relocate_functions<64, false>::pcrela64(view, value, addend, address);
+ gold_assert(have_got_offset);
+ typename elfcpp::Elf_types<size>::Elf_Addr value;
+ value = target->got_plt_section()->address() + got_offset;
+ Relocate_functions<size, false>::pcrela64(view, value, addend, address);
}
break;
case elfcpp::R_X86_64_GLOB_DAT:
case elfcpp::R_X86_64_JUMP_SLOT:
case elfcpp::R_X86_64_RELATIVE:
+ case elfcpp::R_X86_64_IRELATIVE:
// These are outstanding tls relocs, which are unexpected when linking
case elfcpp::R_X86_64_TPOFF64:
case elfcpp::R_X86_64_DTPMOD64:
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
case elfcpp::R_X86_64_TPOFF32: // Local-exec
this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
- view, address, view_size);
+ view, address, view_size);
break;
case elfcpp::R_X86_64_SIZE32:
// Perform a TLS relocation.
+template<int size>
inline void
-Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
- Target_x86_64* target,
- size_t relnum,
- const elfcpp::Rela<64, false>& rela,
- unsigned int r_type,
- const Sized_symbol<64>* gsym,
- const Symbol_value<64>* psymval,
- unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr address,
- section_size_type view_size)
+Target_x86_64<size>::Relocate::relocate_tls(
+ const Relocate_info<size, false>* relinfo,
+ Target_x86_64<size>* target,
+ size_t relnum,
+ const elfcpp::Rela<size, false>& 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)
{
Output_segment* tls_segment = relinfo->layout->tls_segment();
- const Sized_relobj<64, false>* object = relinfo->object;
+ const Sized_relobj_file<size, false>* object = relinfo->object;
const elfcpp::Elf_Xword addend = rela.get_r_addend();
+ elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
+ bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
- elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0);
+ typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
const bool is_final = (gsym == NULL
- ? !parameters->options().output_is_position_independent()
+ ? !parameters->options().shared()
: gsym->final_value_is_known());
- const tls::Tls_optimization optimized_type
- = Target_x86_64::optimize_tls_reloc(is_final, r_type);
+ tls::Tls_optimization optimized_type
+ = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
switch (r_type)
{
case elfcpp::R_X86_64_TLSGD: // Global-dynamic
- this->saw_tls_block_reloc_ = true;
+ if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
+ {
+ // If this code sequence is used in a non-executable section,
+ // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
+ // on the assumption that it's being used by itself in a debug
+ // section. Therefore, in the unlikely event that the code
+ // sequence appears in a non-executable section, we simply
+ // leave it unoptimized.
+ optimized_type = tls::TLSOPT_NONE;
+ }
if (optimized_type == tls::TLSOPT_TO_LE)
{
- gold_assert(tls_segment != NULL);
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
this->tls_gd_to_le(relinfo, relnum, tls_segment,
rela, r_type, value, view,
view_size);
break;
}
else
- {
- unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
- ? GOT_TYPE_TLS_OFFSET
- : GOT_TYPE_TLS_PAIR);
- unsigned int got_offset;
- if (gsym != NULL)
- {
- gold_assert(gsym->has_got_offset(got_type));
- got_offset = gsym->got_offset(got_type) - target->got_size();
- }
- else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info());
- gold_assert(object->local_has_got_offset(r_sym, got_type));
- got_offset = (object->local_got_offset(r_sym, got_type)
- - target->got_size());
- }
- if (optimized_type == tls::TLSOPT_TO_IE)
- {
- gold_assert(tls_segment != NULL);
- value = target->got_plt_section()->address() + got_offset;
- this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
- value, view, address, view_size);
- break;
- }
- else if (optimized_type == tls::TLSOPT_NONE)
- {
- // Relocate the field with the offset of the pair of GOT
- // entries.
+ {
+ unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
+ ? GOT_TYPE_TLS_OFFSET
+ : GOT_TYPE_TLS_PAIR);
+ unsigned int got_offset;
+ if (gsym != NULL)
+ {
+ gold_assert(gsym->has_got_offset(got_type));
+ got_offset = gsym->got_offset(got_type) - target->got_size();
+ }
+ 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));
+ got_offset = (object->local_got_offset(r_sym, got_type)
+ - target->got_size());
+ }
+ if (optimized_type == tls::TLSOPT_TO_IE)
+ {
+ value = target->got_plt_section()->address() + got_offset;
+ this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
+ value, view, address, view_size);
+ break;
+ }
+ else if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Relocate the field with the offset of the pair of GOT
+ // entries.
value = target->got_plt_section()->address() + got_offset;
- Relocate_functions<64, false>::pcrela32(view, value, addend,
- address);
- break;
- }
- }
+ Relocate_functions<size, false>::pcrela32(view, value, addend,
+ address);
+ break;
+ }
+ }
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc %u"), r_type);
break;
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
case elfcpp::R_X86_64_TLSDESC_CALL:
- this->saw_tls_block_reloc_ = true;
+ if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
+ {
+ // See above comment for R_X86_64_TLSGD.
+ optimized_type = tls::TLSOPT_NONE;
+ }
if (optimized_type == tls::TLSOPT_TO_LE)
{
- gold_assert(tls_segment != NULL);
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
- rela, r_type, value, view,
- view_size);
+ rela, r_type, value, view,
+ view_size);
break;
}
else
- {
- unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
- ? GOT_TYPE_TLS_OFFSET
- : GOT_TYPE_TLS_DESC);
- unsigned int got_offset;
- if (gsym != NULL)
- {
- gold_assert(gsym->has_got_offset(got_type));
- got_offset = gsym->got_offset(got_type) - target->got_size();
- }
- else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info());
- gold_assert(object->local_has_got_offset(r_sym, got_type));
- got_offset = (object->local_got_offset(r_sym, got_type)
- - target->got_size());
- }
- if (optimized_type == tls::TLSOPT_TO_IE)
- {
- gold_assert(tls_segment != NULL);
- value = target->got_plt_section()->address() + got_offset;
- this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
- rela, r_type, value, view, address,
- view_size);
- break;
- }
- else if (optimized_type == tls::TLSOPT_NONE)
- {
- if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
- {
- // Relocate the field with the offset of the pair of GOT
- // entries.
- value = target->got_plt_section()->address() + got_offset;
- Relocate_functions<64, false>::pcrela32(view, value, addend,
- address);
- }
- break;
- }
- }
+ {
+ unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
+ ? GOT_TYPE_TLS_OFFSET
+ : GOT_TYPE_TLS_DESC);
+ unsigned int got_offset = 0;
+ if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
+ && optimized_type == tls::TLSOPT_NONE)
+ {
+ // We created GOT entries in the .got.tlsdesc portion of
+ // the .got.plt section, but the offset stored in the
+ // symbol is the offset within .got.tlsdesc.
+ got_offset = (target->got_size()
+ + target->got_plt_section()->data_size());
+ }
+ if (gsym != NULL)
+ {
+ gold_assert(gsym->has_got_offset(got_type));
+ got_offset += gsym->got_offset(got_type) - target->got_size();
+ }
+ 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));
+ got_offset += (object->local_got_offset(r_sym, got_type)
+ - target->got_size());
+ }
+ if (optimized_type == tls::TLSOPT_TO_IE)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
+ value = target->got_plt_section()->address() + got_offset;
+ this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
+ rela, r_type, value, view, address,
+ view_size);
+ break;
+ }
+ else if (optimized_type == tls::TLSOPT_NONE)
+ {
+ if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
+ {
+ // Relocate the field with the offset of the pair of GOT
+ // entries.
+ value = target->got_plt_section()->address() + got_offset;
+ Relocate_functions<size, false>::pcrela32(view, value, addend,
+ address);
+ }
+ break;
+ }
+ }
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc %u"), r_type);
break;
case elfcpp::R_X86_64_TLSLD: // Local-dynamic
- this->saw_tls_block_reloc_ = true;
+ if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
+ {
+ // See above comment for R_X86_64_TLSGD.
+ optimized_type = tls::TLSOPT_NONE;
+ }
if (optimized_type == tls::TLSOPT_TO_LE)
- {
- gold_assert(tls_segment != NULL);
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
value, view, view_size);
break;
- }
+ }
else if (optimized_type == tls::TLSOPT_NONE)
- {
- // Relocate the field with the offset of the GOT entry for
- // the module index.
- unsigned int got_offset;
- got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
+ {
+ // Relocate the field with the offset of the GOT entry for
+ // the module index.
+ unsigned int got_offset;
+ got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
- target->got_size());
value = target->got_plt_section()->address() + got_offset;
- Relocate_functions<64, false>::pcrela32(view, value, addend,
- address);
- break;
- }
+ Relocate_functions<size, false>::pcrela32(view, value, addend,
+ address);
+ break;
+ }
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc %u"), r_type);
break;
case elfcpp::R_X86_64_DTPOFF32:
- gold_assert(tls_segment != NULL);
- if (optimized_type == tls::TLSOPT_TO_LE)
- {
- // This relocation type is used in debugging information.
- // In that case we need to not optimize the value. If we
- // haven't seen a TLSLD reloc, then we assume we should not
- // optimize this reloc.
- if (this->saw_tls_block_reloc_)
- value -= tls_segment->memsz();
- }
- Relocate_functions<64, false>::rela32(view, value, addend);
+ // This relocation type is used in debugging information.
+ // In that case we need to not optimize the value. If the
+ // section is not executable, then we assume we should not
+ // optimize this reloc. See comments above for R_X86_64_TLSGD,
+ // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
+ // R_X86_64_TLSLD.
+ if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
+ value -= tls_segment->memsz();
+ }
+ Relocate_functions<size, false>::rela32(view, value, addend);
break;
case elfcpp::R_X86_64_DTPOFF64:
- gold_assert(tls_segment != NULL);
- if (optimized_type == tls::TLSOPT_TO_LE)
- {
- // See R_X86_64_DTPOFF32, just above, for why we test this.
- if (this->saw_tls_block_reloc_)
- value -= tls_segment->memsz();
- }
- Relocate_functions<64, false>::rela64(view, value, addend);
+ // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
+ if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
+ value -= tls_segment->memsz();
+ }
+ Relocate_functions<size, false>::rela64(view, value, addend);
break;
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
if (optimized_type == tls::TLSOPT_TO_LE)
{
- gold_assert(tls_segment != NULL);
- Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
- rela, r_type, value, view,
- view_size);
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
+ Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
+ tls_segment, rela,
+ r_type, value, view,
+ view_size);
break;
}
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)
- - target->got_size());
- }
- else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<64>(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)
- - target->got_size());
- }
+ {
+ // 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)
+ - target->got_size());
+ }
+ 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)
+ - target->got_size());
+ }
value = target->got_plt_section()->address() + got_offset;
- Relocate_functions<64, false>::pcrela32(view, value, addend, address);
- break;
- }
+ Relocate_functions<size, false>::pcrela32(view, value, addend,
+ address);
+ break;
+ }
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc type %u"),
r_type);
break;
case elfcpp::R_X86_64_TPOFF32: // Local-exec
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
value -= tls_segment->memsz();
- Relocate_functions<64, false>::rela32(view, value, addend);
+ Relocate_functions<size, false>::rela32(view, value, addend);
break;
}
}
// Do a relocation in which we convert a TLS General-Dynamic to an
// Initial-Exec.
+template<int size>
inline void
-Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo,
- size_t relnum,
- Output_segment*,
- const elfcpp::Rela<64, false>& rela,
- unsigned int,
- elfcpp::Elf_types<64>::Elf_Addr value,
- unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr address,
- section_size_type view_size)
-{
- // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
- // .word 0x6666; rex64; call __tls_get_addr
- // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
-
- tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4);
- tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
+Target_x86_64<size>::Relocate::tls_gd_to_ie(
+ const Relocate_info<size, false>* relinfo,
+ size_t relnum,
+ Output_segment*,
+ const elfcpp::Rela<size, false>& rela,
+ unsigned int,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
+ section_size_type view_size)
+{
+ // For SIZE == 64:
+ // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
+ // .word 0x6666; rex64; call __tls_get_addr
+ // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
+ // For SIZE == 32:
+ // leaq foo@tlsgd(%rip),%rdi;
+ // .word 0x6666; rex64; call __tls_get_addr
+ // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
- tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
+ (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
- memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16);
+ if (size == 64)
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
+ -4);
+ tls::check_tls(relinfo, relnum, rela.get_r_offset(),
+ (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
+ memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
+ 16);
+ }
+ else
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
+ -3);
+ tls::check_tls(relinfo, relnum, rela.get_r_offset(),
+ (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
+ memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
+ 15);
+ }
const elfcpp::Elf_Xword addend = rela.get_r_addend();
- Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address);
+ Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
+ address);
// The next reloc should be a PLT32 reloc against __tls_get_addr.
// We can skip it.
// Do a relocation in which we convert a TLS General-Dynamic to a
// Local-Exec.
+template<int size>
inline void
-Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo,
- size_t relnum,
- Output_segment* tls_segment,
- const elfcpp::Rela<64, false>& rela,
- unsigned int,
- elfcpp::Elf_types<64>::Elf_Addr value,
- unsigned char* view,
- section_size_type view_size)
-{
- // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
- // .word 0x6666; rex64; call __tls_get_addr
- // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
-
- tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4);
- tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
+Target_x86_64<size>::Relocate::tls_gd_to_le(
+ const Relocate_info<size, false>* relinfo,
+ size_t relnum,
+ Output_segment* tls_segment,
+ const elfcpp::Rela<size, false>& rela,
+ unsigned int,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ unsigned char* view,
+ section_size_type view_size)
+{
+ // For SIZE == 64:
+ // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
+ // .word 0x6666; rex64; call __tls_get_addr
+ // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
+ // For SIZE == 32:
+ // leaq foo@tlsgd(%rip),%rdi;
+ // .word 0x6666; rex64; call __tls_get_addr
+ // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
- tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
+ (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
+
+ if (size == 64)
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
+ -4);
+ tls::check_tls(relinfo, relnum, rela.get_r_offset(),
+ (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
+ memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
+ 16);
+ }
+ else
+ {
+ tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
+ -3);
+ tls::check_tls(relinfo, relnum, rela.get_r_offset(),
+ (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
- memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16);
+ memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
+ 15);
+ }
value -= tls_segment->memsz();
- Relocate_functions<64, false>::rela32(view + 8, value, 0);
+ Relocate_functions<size, false>::rela32(view + 8, value, 0);
// The next reloc should be a PLT32 reloc against __tls_get_addr.
// We can skip it.
// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
+template<int size>
inline void
-Target_x86_64::Relocate::tls_desc_gd_to_ie(
- const Relocate_info<64, false>* relinfo,
+Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
+ const Relocate_info<size, false>* relinfo,
size_t relnum,
Output_segment*,
- const elfcpp::Rela<64, false>& rela,
+ const elfcpp::Rela<size, false>& rela,
unsigned int r_type,
- elfcpp::Elf_types<64>::Elf_Addr value,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr address,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
section_size_type view_size)
{
if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
+ view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
view[-2] = 0x8b;
const elfcpp::Elf_Xword addend = rela.get_r_addend();
- Relocate_functions<64, false>::pcrela32(view, value, addend, address);
+ Relocate_functions<size, false>::pcrela32(view, value, addend, address);
}
else
{
gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- view[0] == 0xff && view[1] == 0x10);
+ view[0] == 0xff && view[1] == 0x10);
view[0] = 0x66;
view[1] = 0x90;
}
// Do a TLSDESC-style General-Dynamic to Local-Exec transition.
+template<int size>
inline void
-Target_x86_64::Relocate::tls_desc_gd_to_le(
- const Relocate_info<64, false>* relinfo,
+Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
+ const Relocate_info<size, false>* relinfo,
size_t relnum,
Output_segment* tls_segment,
- const elfcpp::Rela<64, false>& rela,
+ const elfcpp::Rela<size, false>& rela,
unsigned int r_type,
- elfcpp::Elf_types<64>::Elf_Addr value,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned char* view,
section_size_type view_size)
{
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
+ view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
view[-2] = 0xc7;
view[-1] = 0xc0;
value -= tls_segment->memsz();
- Relocate_functions<64, false>::rela32(view, value, 0);
+ Relocate_functions<size, false>::rela32(view, value, 0);
}
else
{
gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- view[0] == 0xff && view[1] == 0x10);
+ view[0] == 0xff && view[1] == 0x10);
view[0] = 0x66;
view[1] = 0x90;
}
}
+template<int size>
inline void
-Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo,
- size_t relnum,
- Output_segment*,
- const elfcpp::Rela<64, false>& rela,
- unsigned int,
- elfcpp::Elf_types<64>::Elf_Addr,
- unsigned char* view,
- section_size_type view_size)
+Target_x86_64<size>::Relocate::tls_ld_to_le(
+ const Relocate_info<size, false>* relinfo,
+ size_t relnum,
+ Output_segment*,
+ const elfcpp::Rela<size, false>& rela,
+ unsigned int,
+ typename elfcpp::Elf_types<size>::Elf_Addr,
+ unsigned char* view,
+ section_size_type view_size)
{
// leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
+ // For SIZE == 64:
// ... leq foo@dtpoff(%rax),%reg
// ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
+ // For SIZE == 32:
+ // ... leq foo@dtpoff(%rax),%reg
+ // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
+ view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8);
- memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
+ if (size == 64)
+ memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
+ else
+ memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
// The next reloc should be a PLT32 reloc against __tls_get_addr.
// We can skip it.
// Do a relocation in which we convert a TLS Initial-Exec to a
// Local-Exec.
+template<int size>
inline void
-Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo,
- size_t relnum,
- Output_segment* tls_segment,
- const elfcpp::Rela<64, false>& rela,
- unsigned int,
- elfcpp::Elf_types<64>::Elf_Addr value,
- unsigned char* view,
- section_size_type view_size)
+Target_x86_64<size>::Relocate::tls_ie_to_le(
+ const Relocate_info<size, false>* relinfo,
+ size_t relnum,
+ Output_segment* tls_segment,
+ const elfcpp::Rela<size, false>& rela,
+ unsigned int,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ unsigned char* view,
+ section_size_type view_size)
{
// We need to examine the opcodes to figure out which instruction we
// are looking at.
{
// movq
if (op1 == 0x4c)
- view[-3] = 0x49;
+ view[-3] = 0x49;
view[-2] = 0xc7;
view[-1] = 0xc0 | reg;
}
{
// Special handling for %rsp.
if (op1 == 0x4c)
- view[-3] = 0x49;
+ view[-3] = 0x49;
view[-2] = 0x81;
view[-1] = 0xc0 | reg;
}
{
// addq
if (op1 == 0x4c)
- view[-3] = 0x4d;
+ view[-3] = 0x4d;
view[-2] = 0x8d;
view[-1] = 0x80 | reg | (reg << 3);
}
value -= tls_segment->memsz();
- Relocate_functions<64, false>::rela32(view, value, 0);
+ Relocate_functions<size, false>::rela32(view, value, 0);
}
// Relocate section data.
+template<int size>
void
-Target_x86_64::relocate_section(const Relocate_info<64, false>* 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,
- elfcpp::Elf_types<64>::Elf_Addr address,
- section_size_type view_size)
+Target_x86_64<size>::relocate_section(
+ const Relocate_info<size, false>* 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<64, false, Target_x86_64, elfcpp::SHT_RELA,
- Target_x86_64::Relocate>(
+ gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
+ typename Target_x86_64<size>::Relocate,
+ gold::Default_comdat_behavior>(
relinfo,
this,
prelocs,
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_x86_64<size>::apply_relocation(
+ const Relocate_info<size, false>* 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, false, Target_x86_64<size>,
+ typename Target_x86_64<size>::Relocate>(
+ relinfo,
+ this,
+ r_offset,
+ r_type,
+ r_addend,
+ gsym,
+ view,
+ address,
view_size);
}
// Return the size of a relocation while scanning during a relocatable
// link.
+template<int size>
unsigned int
-Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc(
+Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc(
unsigned int r_type,
Relobj* object)
{
switch (r_type)
{
case elfcpp::R_X86_64_NONE:
- case elfcpp::R_386_GNU_VTINHERIT:
- case elfcpp::R_386_GNU_VTENTRY:
+ case elfcpp::R_X86_64_GNU_VTINHERIT:
+ case elfcpp::R_X86_64_GNU_VTENTRY:
case elfcpp::R_X86_64_TLSGD: // Global-dynamic
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
case elfcpp::R_X86_64_TLSDESC_CALL:
case elfcpp::R_X86_64_32:
case elfcpp::R_X86_64_32S:
case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
case elfcpp::R_X86_64_GOTPC32:
case elfcpp::R_X86_64_GOT32:
return 4;
case elfcpp::R_X86_64_GLOB_DAT:
case elfcpp::R_X86_64_JUMP_SLOT:
case elfcpp::R_X86_64_RELATIVE:
+ case elfcpp::R_X86_64_IRELATIVE:
// These are outstanding tls relocs, which are unexpected when linking
case elfcpp::R_X86_64_TPOFF64:
case elfcpp::R_X86_64_DTPMOD64:
// Scan the relocs during a relocatable link.
+template<int size>
void
-Target_x86_64::scan_relocatable_relocs(const General_options& options,
- Symbol_table* symtab,
- Layout* layout,
- Sized_relobj<64, false>* 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)
+Target_x86_64<size>::scan_relocatable_relocs(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, false>* 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<64, false, elfcpp::SHT_RELA,
+ gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA,
Scan_relocatable_relocs>(
- options,
symtab,
layout,
object,
// Relocate a section during a relocatable link.
+template<int size>
void
-Target_x86_64::relocate_for_relocatable(
- const Relocate_info<64, false>* relinfo,
+Target_x86_64<size>::relocate_relocs(
+ const Relocate_info<size, false>* relinfo,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
- off_t offset_in_output_section,
+ typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
const Relocatable_relocs* rr,
unsigned char* view,
- elfcpp::Elf_types<64>::Elf_Addr view_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr view_address,
section_size_type view_size,
unsigned char* reloc_view,
section_size_type reloc_view_size)
{
gold_assert(sh_type == elfcpp::SHT_RELA);
- gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>(
+ gold::relocate_relocs<size, false, elfcpp::SHT_RELA>(
relinfo,
prelocs,
reloc_count,
// pointers across shared library boundaries, as described in the
// processor specific ABI supplement.
+template<int size>
uint64_t
-Target_x86_64::do_dynsym_value(const Symbol* gsym) const
+Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
{
gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
- return this->plt_section()->address() + gsym->plt_offset();
+ 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_x86_64::do_code_fill(section_size_type length) const
+Target_x86_64<size>::do_code_fill(section_size_type length) const
{
if (length >= 16)
{
jmp[0] = 0xe9;
elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
- + std::string(length - 5, '\0'));
+ + std::string(length - 5, static_cast<char>(0x90)));
}
// Nop sequences of various lengths.
- const char nop1[1] = { 0x90 }; // nop
- const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax
- const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
- const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
- const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
- 0x00 }; // leal 0(%esi,1),%esi
- const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
- 0x00, 0x00 };
- const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
- 0x00, 0x00, 0x00 };
- const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
- 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
- const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
- 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
- 0x00 };
- const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
- 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
- 0x00, 0x00 };
- const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
- 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
- 0x00, 0x00, 0x00 };
- const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
- 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
- 0x00, 0x00, 0x00, 0x00 };
- const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
- 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
- 0x27, 0x00, 0x00, 0x00,
- 0x00 };
- const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
- 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
- 0xbc, 0x27, 0x00, 0x00,
- 0x00, 0x00 };
- const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
- 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
- 0x90, 0x90, 0x90, 0x90,
- 0x90, 0x90, 0x90 };
+ const char nop1[1] = { '\x90' }; // nop
+ const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax
+ const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
+ const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax)
+ '\x00'};
+ const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1)
+ '\x00', '\x00' };
+ const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1)
+ '\x44', '\x00', '\x00' };
+ const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax)
+ '\x00', '\x00', '\x00',
+ '\x00' };
+ const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1)
+ '\x00', '\x00', '\x00',
+ '\x00', '\x00' };
+ const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1)
+ '\x84', '\x00', '\x00',
+ '\x00', '\x00', '\x00' };
+ const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
+ '\x1f', '\x84', '\x00',
+ '\x00', '\x00', '\x00',
+ '\x00' };
+ const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
+ '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
+ '\x00', '\x00', '\x00',
+ '\x00', '\x00' };
+ const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
+ '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
+ '\x84', '\x00', '\x00',
+ '\x00', '\x00', '\x00' };
+ const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
+ '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
+ '\x1f', '\x84', '\x00',
+ '\x00', '\x00', '\x00',
+ '\x00' };
+ const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
+ '\x66', '\x66', '\x2e', // data16
+ '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
+ '\x00', '\x00', '\x00',
+ '\x00', '\x00' };
+ const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
+ '\x66', '\x66', '\x66', // data16; data16
+ '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
+ '\x84', '\x00', '\x00',
+ '\x00', '\x00', '\x00' };
const char* nops[16] = {
NULL,
return std::string(nops[length], length);
}
-// The selector for x86_64 object files.
+// Return the addend to use for a target specific relocation. The
+// only target specific relocation is R_X86_64_TLSDESC for a local
+// symbol. We want to set the addend is the offset of the local
+// symbol in the TLS segment.
+
+template<int size>
+uint64_t
+Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
+ uint64_t) const
+{
+ gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
+ uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
+ gold_assert(intarg < this->tlsdesc_reloc_info_.size());
+ const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
+ const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
+ gold_assert(psymval->is_tls_symbol());
+ // The value of a TLS symbol is the offset in the TLS segment.
+ return psymval->value(ti.object, 0);
+}
+
+// Return the value to use for the base of a DW_EH_PE_datarel offset
+// in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
+// assembler can not write out the difference between two labels in
+// different sections, so instead of using a pc-relative value they
+// use an offset from the GOT.
+
+template<int size>
+uint64_t
+Target_x86_64<size>::do_ehframe_datarel_base() const
+{
+ gold_assert(this->global_offset_table_ != NULL);
+ Symbol* sym = this->global_offset_table_;
+ Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
+ return ssym->value();
+}
+
+// FNOFFSET in section SHNDX in OBJECT is the start of a function
+// compiled with -fsplit-stack. The function calls non-split-stack
+// code. We have to change the function so that it always ensures
+// that it has enough stack space to run some random function.
+
+template<int size>
+void
+Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
+ section_offset_type fnoffset,
+ section_size_type fnsize,
+ unsigned char* view,
+ section_size_type view_size,
+ std::string* from,
+ std::string* to) const
+{
+ // The function starts with a comparison of the stack pointer and a
+ // field in the TCB. This is followed by a jump.
+
+ // cmp %fs:NN,%rsp
+ if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5)
+ && fnsize > 9)
+ {
+ // We will call __morestack if the carry flag is set after this
+ // comparison. We turn the comparison into an stc instruction
+ // and some nops.
+ view[fnoffset] = '\xf9';
+ this->set_view_to_nop(view, view_size, fnoffset + 1, 8);
+ }
+ // lea NN(%rsp),%r10
+ // lea NN(%rsp),%r11
+ else if ((this->match_view(view, view_size, fnoffset,
+ "\x4c\x8d\x94\x24", 4)
+ || this->match_view(view, view_size, fnoffset,
+ "\x4c\x8d\x9c\x24", 4))
+ && fnsize > 8)
+ {
+ // This is loading an offset from the stack pointer for a
+ // comparison. The offset is negative, so we decrease the
+ // offset by the amount of space we need for the stack. This
+ // means we will avoid calling __morestack if there happens to
+ // be plenty of space on the stack already.
+ unsigned char* pval = view + fnoffset + 4;
+ uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
+ val -= parameters->options().split_stack_adjust_size();
+ elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
+ }
+ else
+ {
+ if (!object->has_no_split_stack())
+ object->error(_("failed to match split-stack sequence at "
+ "section %u offset %0zx"),
+ shndx, static_cast<size_t>(fnoffset));
+ return;
+ }
+
+ // We have to change the function so that it calls
+ // __morestack_non_split instead of __morestack. The former will
+ // allocate additional stack space.
+ *from = "__morestack";
+ *to = "__morestack_non_split";
+}
+
+// The selector for x86_64 object files. Note this is never instantiated
+// directly. It's only used in Target_selector_x86_64_nacl, below.
-class Target_selector_x86_64 : public Target_selector
+template<int size>
+class Target_selector_x86_64 : public Target_selector_freebsd
{
public:
Target_selector_x86_64()
- : Target_selector(elfcpp::EM_X86_64, 64, false, "elf64-x86-64")
+ : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
+ (size == 64
+ ? "elf64-x86-64" : "elf32-x86-64"),
+ (size == 64
+ ? "elf64-x86-64-freebsd"
+ : "elf32-x86-64-freebsd"),
+ (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
{ }
Target*
do_instantiate_target()
- { return new Target_x86_64(); }
+ { return new Target_x86_64<size>(); }
+
+};
+
+// NaCl variant. It uses different PLT contents.
+
+template<int size>
+class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
+{
+ public:
+ Output_data_plt_x86_64_nacl(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative)
+ : Output_data_plt_x86_64<size>(layout, plt_entry_size,
+ got, got_plt, got_irelative)
+ { }
+
+ Output_data_plt_x86_64_nacl(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative,
+ unsigned int plt_count)
+ : Output_data_plt_x86_64<size>(layout, plt_entry_size,
+ got, got_plt, got_irelative,
+ plt_count)
+ { }
+
+ protected:
+ virtual unsigned int
+ do_get_plt_entry_size() const
+ { return plt_entry_size; }
+
+ virtual void
+ do_add_eh_frame(Layout* layout)
+ {
+ layout->add_eh_frame_for_plt(this,
+ this->plt_eh_frame_cie,
+ this->plt_eh_frame_cie_size,
+ plt_eh_frame_fde,
+ plt_eh_frame_fde_size);
+ }
+
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
+
+ virtual unsigned int
+ do_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_index);
+
+ virtual void
+ do_fill_tlsdesc_entry(unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_base,
+ unsigned int tlsdesc_got_offset,
+ unsigned int plt_offset);
+
+ private:
+ // The size of an entry in the PLT.
+ static const int plt_entry_size = 64;
+
+ // The first entry in the PLT.
+ static const unsigned char first_plt_entry[plt_entry_size];
+
+ // Other entries in the PLT for an executable.
+ static const unsigned char plt_entry[plt_entry_size];
+
+ // The reserved TLSDESC entry in the PLT for an executable.
+ static const unsigned char tlsdesc_plt_entry[plt_entry_size];
+
+ // The .eh_frame unwind information for the PLT.
+ static const int plt_eh_frame_fde_size = 32;
+ static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
+};
+
+template<int size>
+class Target_x86_64_nacl : public Target_x86_64<size>
+{
+ public:
+ Target_x86_64_nacl()
+ : Target_x86_64<size>(&x86_64_nacl_info)
+ { }
+
+ virtual Output_data_plt_x86_64<size>*
+ do_make_data_plt(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative)
+ {
+ return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
+ got_irelative);
+ }
+
+ virtual Output_data_plt_x86_64<size>*
+ do_make_data_plt(Layout* layout,
+ Output_data_got<64, false>* got,
+ Output_data_got_plt_x86_64* got_plt,
+ Output_data_space* got_irelative,
+ unsigned int plt_count)
+ {
+ return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
+ got_irelative,
+ plt_count);
+ }
+
+ virtual std::string
+ do_code_fill(section_size_type length) const;
+
+ private:
+ static const Target::Target_info x86_64_nacl_info;
+};
+
+template<>
+const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
+{
+ 64, // size
+ false, // is_big_endian
+ elfcpp::EM_X86_64, // 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
+ "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
+ 0x20000, // default_text_segment_address
+ 0x10000, // abi_pagesize (overridable by -z max-page-size)
+ 0x10000, // common_pagesize (overridable by -z common-page-size)
+ true, // isolate_execinstr
+ 0x10000000, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
+ 0, // small_common_section_flags
+ elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
+};
+
+template<>
+const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
+{
+ 32, // size
+ false, // is_big_endian
+ elfcpp::EM_X86_64, // 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-nacl-x86-64.so.1", // dynamic_linker
+ 0x20000, // default_text_segment_address
+ 0x10000, // abi_pagesize (overridable by -z max-page-size)
+ 0x10000, // common_pagesize (overridable by -z common-page-size)
+ true, // isolate_execinstr
+ 0x10000000, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
+ 0, // small_common_section_flags
+ elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
+};
+
+#define NACLMASK 0xe0 // 32-byte alignment mask.
+
+// The first entry in the PLT.
+
+template<int size>
+const unsigned char
+Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
+{
+ 0xff, 0x35, // pushq contents of memory address
+ 0, 0, 0, 0, // replaced with address of .got + 8
+ 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11
+ 0, 0, 0, 0, // replaced with address of .got + 16
+ 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
+ 0x4d, 0x01, 0xfb, // add %r15, %r11
+ 0x41, 0xff, 0xe3, // jmpq *%r11
+
+ // 9-byte nop sequence to pad out to the next 32-byte boundary.
+ 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
+
+ // 32 bytes of nop to pad out to the standard size
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
+ 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
+ 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
+ 0x66, // excess data32 prefix
+ 0x90 // nop
+};
+
+template<int size>
+void
+Output_data_plt_x86_64_nacl<size>::do_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)
+{
+ memcpy(pov, first_plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
+ (got_address + 8
+ - (plt_address + 2 + 4)));
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
+ (got_address + 16
+ - (plt_address + 9 + 4)));
+}
+
+// Subsequent entries in the PLT.
+
+template<int size>
+const unsigned char
+Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
+{
+ 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11
+ 0, 0, 0, 0, // replaced with address of symbol in .got
+ 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
+ 0x4d, 0x01, 0xfb, // add %r15, %r11
+ 0x41, 0xff, 0xe3, // jmpq *%r11
+
+ // 15-byte nop sequence to pad out to the next 32-byte boundary.
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
+ 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
+
+ // Lazy GOT entries point here (32-byte aligned).
+ 0x68, // pushq immediate
+ 0, 0, 0, 0, // replaced with index into relocation table
+ 0xe9, // jmp relative
+ 0, 0, 0, 0, // replaced with offset to start of .plt0
+
+ // 22 bytes of nop to pad out to the standard size.
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
+ 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
+ 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax)
+};
+
+template<int size>
+unsigned int
+Output_data_plt_x86_64_nacl<size>::do_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_index)
+{
+ memcpy(pov, plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
+ (got_address + got_offset
+ - (plt_address + plt_offset
+ + 3 + 4)));
+
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
+ - (plt_offset + 38 + 4));
+
+ return 32;
+}
+
+// The reserved TLSDESC entry in the PLT.
+
+template<int size>
+const unsigned char
+Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
+{
+ 0xff, 0x35, // pushq x(%rip)
+ 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
+ 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11
+ 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
+ 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
+ 0x4d, 0x01, 0xfb, // add %r15, %r11
+ 0x41, 0xff, 0xe3, // jmpq *%r11
+
+ // 41 bytes of nop to pad out to the standard size.
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
+ 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
+ 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
+ 0x66, 0x66, // excess data32 prefixes
+ 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
+};
+
+template<int size>
+void
+Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
+ unsigned char* pov,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
+ typename elfcpp::Elf_types<size>::Elf_Addr got_base,
+ unsigned int tlsdesc_got_offset,
+ unsigned int plt_offset)
+{
+ memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
+ (got_address + 8
+ - (plt_address + plt_offset
+ + 2 + 4)));
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
+ (got_base
+ + tlsdesc_got_offset
+ - (plt_address + plt_offset
+ + 9 + 4)));
+}
+
+// The .eh_frame unwind information for the PLT.
+
+template<int size>
+const unsigned char
+Output_data_plt_x86_64_nacl<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_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
+ elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
+ elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
+ elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64.
+ elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
+ 13, // Block length.
+ elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
+ elfcpp::DW_OP_breg16, 0, // Push %rip.
+ elfcpp::DW_OP_const1u, 63, // Push 0x3f.
+ elfcpp::DW_OP_and, // & (%rip & 0x3f).
+ elfcpp::DW_OP_const1u, 37, // Push 0x25.
+ elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25)
+ elfcpp::DW_OP_lit3, // Push 3.
+ elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3)
+ elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
+ elfcpp::DW_CFA_nop, // Align to 32 bytes.
+ elfcpp::DW_CFA_nop
+};
+
+// Return a string used to fill a code section with nops.
+// For NaCl, long NOPs are only valid if they do not cross
+// bundle alignment boundaries, so keep it simple with one-byte NOPs.
+template<int size>
+std::string
+Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const
+{
+ return std::string(length, static_cast<char>(0x90));
+}
+
+// The selector for x86_64-nacl object files.
+
+template<int size>
+class Target_selector_x86_64_nacl
+ : public Target_selector_nacl<Target_selector_x86_64<size>,
+ Target_x86_64_nacl<size> >
+{
+ public:
+ Target_selector_x86_64_nacl()
+ : Target_selector_nacl<Target_selector_x86_64<size>,
+ Target_x86_64_nacl<size> >("x86-64",
+ size == 64
+ ? "elf64-x86-64-nacl"
+ : "elf32-x86-64-nacl",
+ size == 64
+ ? "elf_x86_64_nacl"
+ : "elf32_x86_64_nacl")
+ { }
};
-Target_selector_x86_64 target_selector_x86_64;
+Target_selector_x86_64_nacl<64> target_selector_x86_64;
+Target_selector_x86_64_nacl<32> target_selector_x32;
} // End anonymous namespace.
projects / platform / upstream / binutils.git / blobdiff