// i386.cc -- i386 target support for gold.
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright (C) 2006-2021 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 "i386.h"
#include "target-select.h"
#include "tls.h"
#include "freebsd.h"
+#include "nacl.h"
#include "gc.h"
namespace
using namespace gold;
-class Output_data_plt_i386;
+// A class to handle the .got.plt section.
+
+class Output_data_got_plt_i386 : public Output_section_data_build
+{
+ public:
+ Output_data_got_plt_i386(Layout* layout)
+ : Output_section_data_build(4),
+ 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.
+
+class Output_data_plt_i386 : public Output_section_data
+{
+ public:
+ typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
+
+ Output_data_plt_i386(Layout*, uint64_t addralign,
+ Output_data_got_plt_i386*, Output_data_space*);
+
+ // Add an entry to the PLT.
+ void
+ add_entry(Symbol_table*, Layout*, Symbol* gsym);
+
+ // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
+ unsigned int
+ add_local_ifunc_entry(Symbol_table*, Layout*,
+ Sized_relobj_file<32, false>* relobj,
+ unsigned int local_sym_index);
+
+ // Return the .rel.plt section data.
+ Reloc_section*
+ rel_plt() const
+ { return this->rel_; }
+
+ // Return where the TLS_DESC relocations should go.
+ Reloc_section*
+ rel_tls_desc(Layout*);
+
+ // Return where the IRELATIVE relocations should go.
+ Reloc_section*
+ rel_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(); }
+
+ // 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 the first PLT entry, given the pointer to the PLT section data
+ // and the runtime address of the GOT.
+ void
+ fill_first_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address)
+ { this->do_fill_first_plt_entry(pov, got_address); }
+
+ // Fill a normal PLT entry, given the pointer to the entry's data in the
+ // section, the runtime address of the GOT, the offset into the GOT of
+ // the corresponding slot, the offset into the relocation section of the
+ // corresponding reloc, and the offset of this entry within the whole
+ // PLT. Return the offset from this PLT entry's runtime address that
+ // should be used to compute the initial value of the GOT slot.
+ unsigned int
+ fill_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset)
+ {
+ return this->do_fill_plt_entry(pov, got_address, got_offset,
+ plt_offset, plt_rel_offset);
+ }
+
+ virtual unsigned int
+ do_get_plt_entry_size() const = 0;
+
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address) = 0;
+
+ virtual unsigned int
+ do_fill_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset) = 0;
+
+ virtual void
+ do_add_eh_frame(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 .eh_frame unwind information for the PLT.
+ // The CIE is common across variants of the PLT format.
+ 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()
+ {
+ this->set_data_size((this->count_ + this->irelative_count_ + 1)
+ * this->get_plt_entry_size());
+ }
+
+ // Write out the PLT data.
+ void
+ do_write(Output_file*);
+
+ // We keep a list of global STT_GNU_IFUNC symbols, each with its
+ // offset in the GOT.
+ struct Global_ifunc
+ {
+ Symbol* sym;
+ unsigned int got_offset;
+ };
+
+ // We keep a list of local STT_GNU_IFUNC symbols, each with its
+ // offset in the GOT.
+ struct Local_ifunc
+ {
+ Sized_relobj_file<32, false>* object;
+ unsigned int local_sym_index;
+ unsigned int got_offset;
+ };
+
+ // The reloc section.
+ Reloc_section* rel_;
+ // The TLS_DESC relocations, if necessary. These must follow the
+ // regular PLT relocs.
+ Reloc_section* tls_desc_rel_;
+ // The IRELATIVE relocations, if necessary. These must follow the
+ // regular relocatoins and the TLS_DESC relocations.
+ Reloc_section* irelative_rel_;
+ // The .got.plt section.
+ Output_data_got_plt_i386* 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_386_IRELATIVE relocs. These follow
+ // the regular PLT entries.
+ unsigned int irelative_count_;
+ // Global STT_GNU_IFUNC symbols.
+ std::vector<Global_ifunc> global_ifuncs_;
+ // Local STT_GNU_IFUNC symbols.
+ std::vector<Local_ifunc> local_ifuncs_;
+};
+
+// This is an abstract class for the standard PLT layout.
+// The derived classes below handle the actual PLT contents
+// for the executable (non-PIC) and shared-library (PIC) cases.
+// The unwind information is uniform across those two, so it's here.
+
+class Output_data_plt_i386_standard : public Output_data_plt_i386
+{
+ public:
+ Output_data_plt_i386_standard(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative)
+ : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative)
+ { }
+
+ 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, plt_eh_frame_cie, plt_eh_frame_cie_size,
+ plt_eh_frame_fde, plt_eh_frame_fde_size);
+ }
+
+ // The size of an entry in the PLT.
+ static const int plt_entry_size = 16;
+
+ // 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];
+};
+
+// Actually fill the PLT contents for an executable (non-PIC).
+
+class Output_data_plt_i386_exec : public Output_data_plt_i386_standard
+{
+public:
+ Output_data_plt_i386_exec(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative)
+ : Output_data_plt_i386_standard(layout, got_plt, got_irelative)
+ { }
+
+ protected:
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address);
+
+ virtual unsigned int
+ do_fill_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset);
+
+ private:
+ // The first entry in the PLT for an executable.
+ 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];
+};
+
+// Actually fill the PLT contents for a shared library (PIC).
+
+class Output_data_plt_i386_dyn : public Output_data_plt_i386_standard
+{
+ public:
+ Output_data_plt_i386_dyn(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative)
+ : Output_data_plt_i386_standard(layout, got_plt, got_irelative)
+ { }
+
+ protected:
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr);
+
+ virtual unsigned int
+ do_fill_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset);
+
+ private:
+ // The first entry in the PLT for a shared object.
+ static const unsigned char first_plt_entry[plt_entry_size];
+
+ // Other entries in the PLT for a shared object.
+ static const unsigned char plt_entry[plt_entry_size];
+};
// The i386 target class.
// TLS info comes from
// http://people.redhat.com/drepper/tls.pdf
// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
-class Target_i386 : public Target_freebsd<32, false>
+class Target_i386 : public Sized_target<32, false>
{
public:
typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
- Target_i386()
- : Target_freebsd<32, false>(&i386_info),
- got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL),
- global_offset_table_(NULL), rel_dyn_(NULL),
- copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL),
+ Target_i386(const Target::Target_info* info = &i386_info)
+ : Sized_target<32, false>(info),
+ got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
+ got_tlsdesc_(NULL), global_offset_table_(NULL), rel_dyn_(NULL),
+ rel_irelative_(NULL), copy_relocs_(elfcpp::R_386_COPY),
got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
{ }
- inline bool
- can_check_for_function_pointers() const
- { return true; }
-
- // Process the relocations to determine unreferenced sections for
+ // Process the relocations to determine unreferenced sections for
// garbage collection.
void
gc_process_relocs(Symbol_table* symtab,
- Layout* layout,
- Sized_relobj<32, 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);
+ Layout* layout,
+ Sized_relobj_file<32, 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<32, false>* object,
+ Sized_relobj_file<32, false>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
void
scan_relocatable_relocs(Symbol_table* symtab,
Layout* layout,
- Sized_relobj<32, false>* object,
+ Sized_relobj_file<32, 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.
+ // Scan the relocs for --emit-relocs.
void
- relocate_for_relocatable(const Relocate_info<32, 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<32>::Elf_Addr view_address,
- section_size_type view_size,
- unsigned char* reloc_view,
- section_size_type reloc_view_size);
+ emit_relocs_scan(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<32, 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_syms,
+ Relocatable_relocs* rr);
+
+ // Emit relocations for a section.
+ void
+ relocate_relocs(const Relocate_info<32, false>*,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ elfcpp::Elf_types<32>::Elf_Off offset_in_output_section,
+ unsigned char* view,
+ elfcpp::Elf_types<32>::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
return Target::do_is_local_label_name(name);
}
+ // Return the PLT address to use for a global symbol.
+ uint64_t
+ do_plt_address_for_global(const Symbol* gsym) const
+ { return this->plt_section()->address_for_global(gsym); }
+
+ uint64_t
+ do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
+ { return this->plt_section()->address_for_local(relobj, symndx); }
+
+ // We can tell whether we take the address of a function.
+ inline bool
+ do_can_check_for_function_pointers() const
+ { return true; }
+
+ // Return the base for a DW_EH_PE_datarel encoding.
+ uint64_t
+ do_ehframe_datarel_base() const;
+
// Return whether SYM is call to a non-split function.
bool
- do_is_call_to_non_split(const Symbol* sym, unsigned int) const;
+ do_is_call_to_non_split(const Symbol* sym, const unsigned char*,
+ const unsigned char*, section_size_type) const;
- // Adjust -fstack-split code which calls non-stack-split code.
+ // 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,
+ const unsigned char* prelocs, size_t reloc_count,
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() / 4;
+ }
+
+ // 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;
+
+ protected:
+ // Instantiate the plt_ member.
+ // This chooses the right PLT flavor for an executable or a shared object.
+ Output_data_plt_i386*
+ make_data_plt(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative,
+ bool dyn)
+ { return this->do_make_data_plt(layout, got_plt, got_irelative, dyn); }
+
+ virtual Output_data_plt_i386*
+ do_make_data_plt(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative,
+ bool dyn)
+ {
+ if (dyn)
+ return new Output_data_plt_i386_dyn(layout, got_plt, got_irelative);
+ else
+ return new Output_data_plt_i386_exec(layout, got_plt, got_irelative);
+ }
+
private:
// The class which scans relocations.
struct Scan
{
+ static inline int
+
+ get_reference_flags(unsigned int r_type);
+
inline void
local(Symbol_table* symtab, Layout* layout, Target_i386* target,
- Sized_relobj<32, false>* object,
+ Sized_relobj_file<32, false>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
- const elfcpp::Sym<32, false>& lsym);
+ const elfcpp::Sym<32, false>& lsym,
+ bool is_discarded);
inline void
global(Symbol_table* symtab, Layout* layout, Target_i386* target,
- Sized_relobj<32, false>* object,
+ Sized_relobj_file<32, false>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
inline bool
local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
- Target_i386* target,
- Sized_relobj<32, false>* object,
- unsigned int data_shndx,
- Output_section* output_section,
- const elfcpp::Rel<32, false>& reloc,
+ Target_i386* target,
+ Sized_relobj_file<32, false>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rel<32, false>& reloc,
unsigned int r_type,
- const elfcpp::Sym<32, false>& lsym);
+ const elfcpp::Sym<32, false>& lsym);
inline bool
global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
Target_i386* target,
- Sized_relobj<32, false>* object,
- unsigned int data_shndx,
- Output_section* output_section,
+ Sized_relobj_file<32, false>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
const elfcpp::Rel<32, false>& reloc,
unsigned int r_type,
- Symbol* gsym);
+ Symbol* gsym);
inline bool
possible_function_pointer_reloc(unsigned int r_type);
+ bool
+ reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*,
+ unsigned int r_type);
+
static void
- unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type);
+ unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type);
static void
- unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type,
+ unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type,
Symbol*);
};
// Return whether the static relocation needs to be applied.
inline bool
should_apply_static_reloc(const Sized_symbol<32>* gsym,
- int ref_flags,
- bool is_32bit,
+ unsigned int r_type,
+ bool is_32bit,
Output_section* output_section);
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
- relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*,
- size_t relnum, const elfcpp::Rel<32, false>&,
- unsigned int r_type, const Sized_symbol<32>*,
- const Symbol_value<32>*,
+ relocate(const Relocate_info<32, false>*, unsigned int,
+ Target_i386*, Output_section*, size_t, const unsigned char*,
+ const Sized_symbol<32>*, const Symbol_value<32>*,
unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
section_size_type);
// Do a TLS relocation.
inline void
relocate_tls(const Relocate_info<32, false>*, Target_i386* target,
- size_t relnum, const elfcpp::Rel<32, false>&,
+ size_t relnum, const elfcpp::Rel<32, false>&,
unsigned int r_type, const Sized_symbol<32>*,
const Symbol_value<32>*,
unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
// Do a TLS General-Dynamic to Initial-Exec transition.
inline void
tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum,
- Output_segment* tls_segment,
const elfcpp::Rel<32, false>&, unsigned int r_type,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
// transition.
inline void
tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum,
- Output_segment* tls_segment,
const elfcpp::Rel<32, false>&, unsigned int r_type,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
Local_dynamic_type local_dynamic_type_;
};
- // A class which returns the size required for a relocation type,
- // used while scanning relocs during a relocatable link.
- class Relocatable_size_for_reloc
+ // A class for inquiring about properties of a relocation,
+ // used while scanning relocs during a relocatable link and
+ // garbage collection.
+ class Classify_reloc :
+ public gold::Default_classify_reloc<elfcpp::SHT_REL, 32, false>
{
public:
- unsigned int
+ typedef Reloc_types<elfcpp::SHT_REL, 32, false>::Reloc Reltype;
+
+ // Return the explicit addend of the relocation (return 0 for SHT_REL).
+ static elfcpp::Elf_types<32>::Elf_Swxword
+ get_r_addend(const Reltype*)
+ { return 0; }
+
+ // Return the size of the addend of the relocation (only used for SHT_REL).
+ static unsigned int
get_size_for_reloc(unsigned int, Relobj*);
};
static tls::Tls_optimization
optimize_tls_reloc(bool is_final, int r_type);
+ // Check if relocation against this symbol is a candidate for
+ // conversion from
+ // mov foo@GOT(%reg), %reg
+ // to
+ // lea foo@GOTOFF(%reg), %reg.
+ static bool
+ can_convert_mov_to_lea(const Symbol* gsym)
+ {
+ gold_assert(gsym != NULL);
+ return (gsym->type() != elfcpp::STT_GNU_IFUNC
+ && !gsym->is_undefined ()
+ && !gsym->is_from_dynobj()
+ && !gsym->is_preemptible()
+ && (!parameters->options().shared()
+ || (gsym->visibility() != elfcpp::STV_DEFAULT
+ && gsym->visibility() != elfcpp::STV_PROTECTED)
+ || parameters->options().Bsymbolic())
+ && strcmp(gsym->name(), "_DYNAMIC") != 0);
+ }
+
// Get the GOT section, creating it if necessary.
Output_data_got<32, false>*
got_section(Symbol_table*, Layout*);
// Get the GOT PLT section.
- Output_data_space*
+ Output_data_got_plt_i386*
got_plt_section() const
{
gold_assert(this->got_plt_ != NULL);
return this->got_tlsdesc_;
}
+ // Create the PLT section.
+ void
+ make_plt_section(Symbol_table* symtab, Layout* layout);
+
// Create a PLT entry for a global symbol.
void
make_plt_entry(Symbol_table*, Layout*, Symbol*);
+ // Create a PLT entry for a local STT_GNU_IFUNC symbol.
+ void
+ make_local_ifunc_plt_entry(Symbol_table*, Layout*,
+ Sized_relobj_file<32, 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<32, false>* object);
+ Sized_relobj_file<32, false>* object);
// Get the PLT section.
Output_data_plt_i386*
Reloc_section*
rel_tls_desc_section(Layout*) const;
+ // Get the section to use for IRELATIVE relocations.
+ Reloc_section*
+ rel_irelative_section(Layout*);
+
// Add a potential copy relocation.
void
copy_reloc(Symbol_table* symtab, Layout* layout,
- Sized_relobj<32, false>* object,
+ Sized_relobj_file<32, false>* object,
unsigned int shndx, Output_section* output_section,
Symbol* sym, const elfcpp::Rel<32, false>& reloc)
{
+ unsigned int r_type = elfcpp::elf_r_type<32>(reloc.get_r_info());
this->copy_relocs_.copy_reloc(symtab, layout,
symtab->get_sized_symbol<32>(sym),
- object, shndx, output_section, reloc,
+ object, shndx, output_section,
+ r_type, reloc.get_r_offset(), 0,
this->rel_dyn_section(layout));
}
static const Target::Target_info i386_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
// The PLT section.
Output_data_plt_i386* plt_;
// The GOT PLT section.
- Output_data_space* got_plt_;
+ Output_data_got_plt_i386* got_plt_;
+ // The GOT section for IRELATIVE relocations.
+ Output_data_space* got_irelative_;
// The GOT section for TLSDESC relocations.
Output_data_got<32, false>* got_tlsdesc_;
// The _GLOBAL_OFFSET_TABLE_ symbol.
Symbol* global_offset_table_;
// The dynamic reloc section.
Reloc_section* rel_dyn_;
+ // The section to use for IRELATIVE relocs.
+ Reloc_section* rel_irelative_;
// Relocs saved to avoid a COPY reloc.
Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_;
- // Space for variables copied with a COPY reloc.
- Output_data_space* dynbss_;
// Offset of the GOT entry for the TLS module index.
unsigned int got_mod_index_offset_;
// True if the _TLS_MODULE_BASE_ symbol has been defined.
false, // has_resolve
true, // has_code_fill
true, // is_default_stack_executable
+ true, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/libc.so.1", // dynamic_linker
0x08048000, // 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_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
- NULL // attributes_vendor
+ NULL, // attributes_vendor
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
+ elfcpp::SHT_PROGBITS, // unwind_section_type
};
// Get the GOT section, creating it if necessary.
this->got_ = new Output_data_got<32, false>();
+ // 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);
+
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE),
- this->got_, false, true, true, false);
+ this->got_, got_order, true);
- this->got_plt_ = new Output_data_space(4, "** GOT PLT");
+ this->got_plt_ = new Output_data_got_plt_i386(layout);
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE),
- this->got_plt_, false, false, false,
- true);
+ this->got_plt_, got_plt_order,
+ is_got_plt_relro);
// The first three entries are reserved.
this->got_plt_->set_current_data_size(3 * 4);
- // Those bytes can go into the relro segment.
- layout->increase_relro(3 * 4);
+ if (!is_got_plt_relro)
+ {
+ // Those bytes can go into the relro segment.
+ layout->increase_relro(3 * 4);
+ }
// Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
this->global_offset_table_ =
elfcpp::STV_HIDDEN, 0,
false, false);
+ // If there are any IRELATIVE relocations, they get GOT entries
+ // in .got.plt after the jump slot relocations.
+ this->got_irelative_ = new Output_data_space(4, "** 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 entries.
this->got_tlsdesc_ = new Output_data_got<32, false>();
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE),
- this->got_tlsdesc_, false, false, false,
- true);
+ this->got_tlsdesc_,
+ got_plt_order, is_got_plt_relro);
}
return this->got_;
gold_assert(layout != NULL);
this->rel_dyn_ = new Reloc_section(parameters->options().combreloc());
layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
- elfcpp::SHF_ALLOC, this->rel_dyn_, true,
- false, false, false);
+ elfcpp::SHF_ALLOC, this->rel_dyn_,
+ ORDER_DYNAMIC_RELOCS, false);
}
return this->rel_dyn_;
}
-// A class to handle the PLT data.
+// Get the section to use for IRELATIVE relocs, creating it if
+// necessary. These go in .rel.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_i386 : public Output_section_data
+Target_i386::Reloc_section*
+Target_i386::rel_irelative_section(Layout* layout)
{
- public:
- typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
-
- Output_data_plt_i386(Layout*, Output_data_space*);
-
- // Add an entry to the PLT.
- void
- add_entry(Symbol* gsym);
-
- // Return the .rel.plt section data.
- const Reloc_section*
- rel_plt() const
- { return this->rel_; }
-
- // Return where the TLS_DESC relocations should go.
- Reloc_section*
- rel_tls_desc(Layout*);
-
- protected:
- void
- do_adjust_output_section(Output_section* os);
-
- // Write to a map file.
- void
- do_print_to_mapfile(Mapfile* mapfile) const
- { mapfile->print_output_data(this, _("** PLT")); }
-
- private:
- // The size of an entry in the PLT.
- static const int plt_entry_size = 16;
-
- // The first entry in the PLT for an executable.
- static unsigned char exec_first_plt_entry[plt_entry_size];
-
- // The first entry in the PLT for a shared object.
- static unsigned char dyn_first_plt_entry[plt_entry_size];
-
- // Other entries in the PLT for an executable.
- static unsigned char exec_plt_entry[plt_entry_size];
-
- // Other entries in the PLT for a shared object.
- static unsigned char dyn_plt_entry[plt_entry_size];
+ if (this->rel_irelative_ == NULL)
+ {
+ // Make sure we have already create the dynamic reloc section.
+ this->rel_dyn_section(layout);
+ this->rel_irelative_ = new Reloc_section(false);
+ layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
+ elfcpp::SHF_ALLOC, this->rel_irelative_,
+ ORDER_DYNAMIC_RELOCS, false);
+ gold_assert(this->rel_dyn_->output_section()
+ == this->rel_irelative_->output_section());
+ }
+ return this->rel_irelative_;
+}
- // Set the final size.
- void
- set_final_data_size()
- { this->set_data_size((this->count_ + 1) * plt_entry_size); }
+// 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.
- // Write out the PLT data.
- void
- do_write(Output_file*);
-
- // The reloc section.
- Reloc_section* rel_;
- // The TLS_DESC relocations, if necessary. These must follow the
- // regular PLT relocs.
- Reloc_section* tls_desc_rel_;
- // The .got.plt section.
- Output_data_space* got_plt_;
- // The number of PLT entries.
- unsigned int count_;
-};
+void
+Output_data_got_plt_i386::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_i386::got_section.
+ const off_t got_file_offset = this->offset();
+ gold_assert(this->data_size() >= 12);
+ unsigned char* const got_view = of->get_output_view(got_file_offset, 12);
+ Output_section* dynamic = this->layout_->dynamic_section();
+ uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
+ elfcpp::Swap<32, false>::writeval(got_view, dynamic_addr);
+ memset(got_view + 4, 0, 8);
+ of->write_output_view(got_file_offset, 12, got_view);
+}
// 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.
Output_data_plt_i386::Output_data_plt_i386(Layout* layout,
- Output_data_space* got_plt)
- : Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0)
+ uint64_t addralign,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative)
+ : Output_section_data(addralign),
+ tls_desc_rel_(NULL), irelative_rel_(NULL), got_plt_(got_plt),
+ got_irelative_(got_irelative), count_(0), irelative_count_(0),
+ global_ifuncs_(), local_ifuncs_()
{
this->rel_ = new Reloc_section(false);
layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
- elfcpp::SHF_ALLOC, this->rel_, true,
- false, false, false);
+ elfcpp::SHF_ALLOC, this->rel_,
+ ORDER_DYNAMIC_PLT_RELOCS, false);
}
void
// Add an entry to the PLT.
void
-Output_data_plt_i386::add_entry(Symbol* gsym)
+Output_data_plt_i386::add_entry(Symbol_table* symtab, Layout* layout,
+ Symbol* gsym)
{
gold_assert(!gsym->has_plt_offset());
- // Note that when setting the PLT offset we skip the initial
- // reserved PLT entry.
- gsym->set_plt_offset((this->count_ + 1) * plt_entry_size);
+ // Every PLT entry needs a reloc.
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && gsym->can_use_relative_reloc(false))
+ {
+ gsym->set_plt_offset(this->irelative_count_ * this->get_plt_entry_size());
+ ++this->irelative_count_;
+ section_offset_type got_offset =
+ this->got_irelative_->current_data_size();
+ this->got_irelative_->set_current_data_size(got_offset + 4);
+ Reloc_section* rel = this->rel_irelative(symtab, layout);
+ rel->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE,
+ this->got_irelative_, got_offset);
+ struct Global_ifunc gi;
+ gi.sym = gsym;
+ gi.got_offset = got_offset;
+ this->global_ifuncs_.push_back(gi);
+ }
+ else
+ {
+ // When setting the PLT offset we skip the initial reserved PLT
+ // entry.
+ gsym->set_plt_offset((this->count_ + 1) * this->get_plt_entry_size());
- ++this->count_;
+ ++this->count_;
- section_offset_type got_offset = this->got_plt_->current_data_size();
+ section_offset_type got_offset = this->got_plt_->current_data_size();
- // Every PLT entry needs a GOT entry which points back to the PLT
- // entry (this will be changed by the dynamic linker, normally
- // lazily when the function is called).
- this->got_plt_->set_current_data_size(got_offset + 4);
+ // 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 + 4);
- // Every PLT entry needs a reloc.
- gsym->set_needs_dynsym_entry();
- this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
- got_offset);
+ gsym->set_needs_dynsym_entry();
+ this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
+ got_offset);
+ }
// Note that we don't need to save the symbol. The contents of the
// PLT are independent of which symbols are used. The symbols only
// appear in the relocations.
}
+// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
+// the PLT offset.
+
+unsigned int
+Output_data_plt_i386::add_local_ifunc_entry(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<32, false>* relobj,
+ unsigned int local_sym_index)
+{
+ 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 + 4);
+
+ // Every PLT entry needs a reloc.
+ Reloc_section* rel = this->rel_irelative(symtab, layout);
+ rel->add_symbolless_local_addend(relobj, local_sym_index,
+ elfcpp::R_386_IRELATIVE,
+ this->got_irelative_, got_offset);
+
+ struct Local_ifunc li;
+ li.object = relobj;
+ li.local_sym_index = local_sym_index;
+ li.got_offset = got_offset;
+ this->local_ifuncs_.push_back(li);
+
+ return plt_offset;
+}
+
// Return where the TLS_DESC relocations should go, creating it if
// necessary. These follow the JUMP_SLOT relocations.
this->tls_desc_rel_ = new Reloc_section(false);
layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
elfcpp::SHF_ALLOC, this->tls_desc_rel_,
- true, false, false, false);
- gold_assert(this->tls_desc_rel_->output_section() ==
- this->rel_->output_section());
+ ORDER_DYNAMIC_PLT_RELOCS, false);
+ gold_assert(this->tls_desc_rel_->output_section()
+ == this->rel_->output_section());
}
return this->tls_desc_rel_;
}
+// Return where the IRELATIVE relocations should go in the PLT. These
+// follow the JUMP_SLOT and TLS_DESC relocations.
+
+Output_data_plt_i386::Reloc_section*
+Output_data_plt_i386::rel_irelative(Symbol_table* symtab, Layout* layout)
+{
+ if (this->irelative_rel_ == NULL)
+ {
+ // Make sure we have a place for the TLS_DESC relocations, in
+ // case we see any later on.
+ this->rel_tls_desc(layout);
+ this->irelative_rel_ = new Reloc_section(false);
+ layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
+ 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 .rel.plt
+ // section to hold R_386_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("__rel_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("__rel_iplt_end", NULL,
+ Symbol_table::PREDEFINED,
+ this->irelative_rel_, 0, 0,
+ elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ elfcpp::STV_HIDDEN, 0, true, true);
+ }
+ }
+ return this->irelative_rel_;
+}
+
+// Return the PLT address to use for a global symbol.
+
+uint64_t
+Output_data_plt_i386::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();
+}
+
+// Return the PLT address to use for a local symbol. These are always
+// IRELATIVE relocs.
+
+uint64_t
+Output_data_plt_i386::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));
+}
+
// The first entry in the PLT for an executable.
-unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] =
+const unsigned char Output_data_plt_i386_exec::first_plt_entry[plt_entry_size] =
{
0xff, 0x35, // pushl contents of memory address
0, 0, 0, 0, // replaced with address of .got + 4
0, 0, 0, 0 // unused
};
+void
+Output_data_plt_i386_exec::do_fill_first_plt_entry(
+ unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address)
+{
+ memcpy(pov, first_plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4);
+ elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8);
+}
+
// The first entry in the PLT for a shared object.
-unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] =
+const unsigned char Output_data_plt_i386_dyn::first_plt_entry[plt_entry_size] =
{
0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
0, 0, 0, 0 // unused
};
+void
+Output_data_plt_i386_dyn::do_fill_first_plt_entry(
+ unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr)
+{
+ memcpy(pov, first_plt_entry, plt_entry_size);
+}
+
// Subsequent entries in the PLT for an executable.
-unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] =
+const unsigned char Output_data_plt_i386_exec::plt_entry[plt_entry_size] =
{
0xff, 0x25, // jmp indirect
0, 0, 0, 0, // replaced with address of symbol in .got
0, 0, 0, 0 // replaced with offset to start of .plt
};
+unsigned int
+Output_data_plt_i386_exec::do_fill_plt_entry(
+ unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset)
+{
+ memcpy(pov, plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
+ got_address + got_offset);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset);
+ elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4));
+ return 6;
+}
+
// Subsequent entries in the PLT for a shared object.
-unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] =
+const unsigned char Output_data_plt_i386_dyn::plt_entry[plt_entry_size] =
{
0xff, 0xa3, // jmp *offset(%ebx)
0, 0, 0, 0, // replaced with offset of symbol in .got
0, 0, 0, 0 // replaced with offset to start of .plt
};
+unsigned int
+Output_data_plt_i386_dyn::do_fill_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset)
+{
+ memcpy(pov, plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset);
+ elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4));
+ return 6;
+}
+
+// The .eh_frame unwind information for the PLT.
+
+const unsigned char
+Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] =
+{
+ 1, // CIE version.
+ 'z', // Augmentation: augmentation size included.
+ 'R', // Augmentation: FDE encoding included.
+ '\0', // End of augmentation string.
+ 1, // Code alignment factor.
+ 0x7c, // Data alignment factor.
+ 8, // Return address column.
+ 1, // Augmentation size.
+ (elfcpp::DW_EH_PE_pcrel // FDE encoding.
+ | elfcpp::DW_EH_PE_sdata4),
+ elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4.
+ elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4.
+ elfcpp::DW_CFA_nop, // Align to 16 bytes.
+ elfcpp::DW_CFA_nop
+};
+
+const unsigned char
+Output_data_plt_i386_standard::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, 8, // DW_CFA_def_cfa_offset: 8.
+ elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
+ elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12.
+ 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_breg4, 4, // Push %esp + 4.
+ elfcpp::DW_OP_breg8, 0, // Push %eip.
+ elfcpp::DW_OP_lit15, // Push 0xf.
+ elfcpp::DW_OP_and, // & (%eip & 0xf).
+ elfcpp::DW_OP_lit11, // Push 0xb.
+ elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb)
+ elfcpp::DW_OP_lit2, // Push 2.
+ elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2)
+ elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4
+ 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 all specified by the i386 ELF
// Processor Supplement.
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);
elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address();
elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address();
- if (parameters->options().output_is_position_independent())
- memcpy(pov, dyn_first_plt_entry, plt_entry_size);
- else
- {
- memcpy(pov, exec_first_plt_entry, plt_entry_size);
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4);
- elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8);
- }
- pov += plt_entry_size;
-
- unsigned char* got_pov = got_view;
+ this->fill_first_plt_entry(pov, got_address);
+ pov += this->get_plt_entry_size();
- memset(got_pov, 0, 12);
- got_pov += 12;
+ // The first three entries in the GOT are reserved, and are written
+ // by Output_data_got_plt_i386::do_write.
+ unsigned char* got_pov = got_view + 12;
const int rel_size = elfcpp::Elf_sizes<32>::rel_size;
- unsigned int plt_offset = plt_entry_size;
+ unsigned int plt_offset = this->get_plt_entry_size();
unsigned int plt_rel_offset = 0;
unsigned int got_offset = 12;
- const unsigned int count = this->count_;
+ const unsigned int count = this->count_ + this->irelative_count_;
for (unsigned int i = 0;
i < count;
++i,
- pov += plt_entry_size,
+ pov += this->get_plt_entry_size(),
got_pov += 4,
- plt_offset += plt_entry_size,
- plt_rel_offset += rel_size,
- got_offset += 4)
- {
- // Set and adjust the PLT entry itself.
-
- if (parameters->options().output_is_position_independent())
- {
- memcpy(pov, dyn_plt_entry, plt_entry_size);
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset);
- }
- else
- {
- memcpy(pov, exec_plt_entry, plt_entry_size);
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
- (got_address
- + got_offset));
- }
-
- elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset);
- elfcpp::Swap<32, false>::writeval(pov + 12,
- - (plt_offset + plt_entry_size));
+ plt_offset += this->get_plt_entry_size(),
+ plt_rel_offset += rel_size,
+ got_offset += 4)
+ {
+ // Set and adjust the PLT entry itself.
+ unsigned int lazy_offset = this->fill_plt_entry(pov,
+ got_address,
+ got_offset,
+ plt_offset,
+ plt_rel_offset);
// Set the entry in the GOT.
- elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6);
+ elfcpp::Swap<32, false>::writeval(got_pov,
+ plt_address + plt_offset + lazy_offset);
+ }
+
+ // If any STT_GNU_IFUNC symbols have PLT entries, we need to change
+ // the GOT to point to the actual symbol value, rather than point to
+ // the PLT entry. That will let the dynamic linker call the right
+ // function when resolving IRELATIVE relocations.
+ unsigned char* got_irelative_view = got_view + this->got_plt_->data_size();
+ for (std::vector<Global_ifunc>::const_iterator p =
+ this->global_ifuncs_.begin();
+ p != this->global_ifuncs_.end();
+ ++p)
+ {
+ const Sized_symbol<32>* ssym =
+ static_cast<const Sized_symbol<32>*>(p->sym);
+ elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset,
+ ssym->value());
+ }
+
+ for (std::vector<Local_ifunc>::const_iterator p =
+ this->local_ifuncs_.begin();
+ p != this->local_ifuncs_.end();
+ ++p)
+ {
+ const Symbol_value<32>* psymval =
+ p->object->local_symbol(p->local_sym_index);
+ elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset,
+ psymval->value(p->object, 0));
}
gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
of->write_output_view(got_file_offset, got_size, got_view);
}
-// Create a PLT entry for a global symbol.
+// Create the PLT section.
void
-Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym)
+Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout)
{
- if (gsym->has_plt_offset())
- return;
-
if (this->plt_ == NULL)
{
// Create the GOT sections first.
this->got_section(symtab, layout);
- this->plt_ = new Output_data_plt_i386(layout, this->got_plt_);
+ const bool dyn = parameters->options().output_is_position_independent();
+ this->plt_ = this->make_data_plt(layout,
+ this->got_plt_,
+ this->got_irelative_,
+ dyn);
+
+ // 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_, false, false, false, false);
+ this->plt_, ORDER_PLT, false);
+
+ // Make the sh_info field of .rel.plt point to .plt.
+ Output_section* rel_plt_os = this->plt_->rel_plt()->output_section();
+ rel_plt_os->set_info_section(this->plt_->output_section());
}
+}
+
+// Create a PLT entry for a global symbol.
+
+void
+Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym)
+{
+ if (gsym->has_plt_offset())
+ return;
+ if (this->plt_ == NULL)
+ this->make_plt_section(symtab, layout);
+ this->plt_->add_entry(symtab, layout, gsym);
+}
+
+// Make a PLT entry for a local STT_GNU_IFUNC symbol.
+
+void
+Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout,
+ Sized_relobj_file<32, 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.
+
+unsigned int
+Target_i386::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.
+
+unsigned int
+Target_i386::first_plt_entry_offset() const
+{
+ if (this->plt_ == NULL)
+ return 0;
+ return this->plt_->first_plt_entry_offset();
+}
- this->plt_->add_entry(gsym);
+// Return the size of each PLT entry.
+
+unsigned int
+Target_i386::plt_entry_size() const
+{
+ if (this->plt_ == NULL)
+ return 0;
+ return this->plt_->get_plt_entry_size();
}
// Get the section to use for TLS_DESC relocations.
unsigned int
Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
- Sized_relobj<32, false>* object)
+ Sized_relobj_file<32, false>* object)
{
if (this->got_mod_index_offset_ == -1U)
{
Output_data_got<32, false>* got = this->got_section(symtab, layout);
unsigned int got_offset = got->add_constant(0);
rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got,
- got_offset);
+ got_offset);
got->add_constant(0);
this->got_mod_index_offset_ = got_offset;
}
}
}
+// Get the Reference_flags for a particular relocation.
+
+int
+Target_i386::Scan::get_reference_flags(unsigned int r_type)
+{
+ switch (r_type)
+ {
+ case elfcpp::R_386_NONE:
+ case elfcpp::R_386_GNU_VTINHERIT:
+ case elfcpp::R_386_GNU_VTENTRY:
+ case elfcpp::R_386_GOTPC:
+ // No symbol reference.
+ return 0;
+
+ case elfcpp::R_386_32:
+ case elfcpp::R_386_16:
+ case elfcpp::R_386_8:
+ return Symbol::ABSOLUTE_REF;
+
+ case elfcpp::R_386_PC32:
+ case elfcpp::R_386_PC16:
+ case elfcpp::R_386_PC8:
+ case elfcpp::R_386_GOTOFF:
+ return Symbol::RELATIVE_REF;
+
+ case elfcpp::R_386_PLT32:
+ return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
+
+ case elfcpp::R_386_GOT32:
+ case elfcpp::R_386_GOT32X:
+ // Absolute in GOT.
+ return Symbol::ABSOLUTE_REF;
+
+ case elfcpp::R_386_TLS_GD: // Global-dynamic
+ case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
+ case elfcpp::R_386_TLS_DESC_CALL:
+ case elfcpp::R_386_TLS_LDM: // Local-dynamic
+ case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
+ case elfcpp::R_386_TLS_IE: // Initial-exec
+ case elfcpp::R_386_TLS_IE_32:
+ case elfcpp::R_386_TLS_GOTIE:
+ case elfcpp::R_386_TLS_LE: // Local-exec
+ case elfcpp::R_386_TLS_LE_32:
+ return Symbol::TLS_REF;
+
+ case elfcpp::R_386_COPY:
+ case elfcpp::R_386_GLOB_DAT:
+ case elfcpp::R_386_JUMP_SLOT:
+ case elfcpp::R_386_RELATIVE:
+ case elfcpp::R_386_IRELATIVE:
+ case elfcpp::R_386_TLS_TPOFF:
+ case elfcpp::R_386_TLS_DTPMOD32:
+ case elfcpp::R_386_TLS_DTPOFF32:
+ case elfcpp::R_386_TLS_TPOFF32:
+ case elfcpp::R_386_TLS_DESC:
+ case elfcpp::R_386_32PLT:
+ case elfcpp::R_386_TLS_GD_32:
+ case elfcpp::R_386_TLS_GD_PUSH:
+ case elfcpp::R_386_TLS_GD_CALL:
+ case elfcpp::R_386_TLS_GD_POP:
+ case elfcpp::R_386_TLS_LDM_32:
+ case elfcpp::R_386_TLS_LDM_PUSH:
+ case elfcpp::R_386_TLS_LDM_CALL:
+ case elfcpp::R_386_TLS_LDM_POP:
+ case elfcpp::R_386_USED_BY_INTEL_200:
+ default:
+ // Not expected. We will give an error later.
+ return 0;
+ }
+}
+
// Report an unsupported relocation against a local symbol.
void
-Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object,
+Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object,
unsigned int r_type)
{
gold_error(_("%s: unsupported reloc %u against local symbol"),
object->name().c_str(), r_type);
}
+// Return whether we need to make a PLT entry for a relocation of a
+// given type against a STT_GNU_IFUNC symbol.
+
+bool
+Target_i386::Scan::reloc_needs_plt_for_ifunc(
+ Sized_relobj_file<32, 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.
inline void
Target_i386::Scan::local(Symbol_table* symtab,
Layout* layout,
Target_i386* target,
- Sized_relobj<32, false>* object,
+ Sized_relobj_file<32, false>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rel<32, false>& reloc,
unsigned int r_type,
- const elfcpp::Sym<32, false>& lsym)
+ const elfcpp::Sym<32, false>& lsym,
+ bool is_discarded)
{
+ if (is_discarded)
+ return;
+
+ // A local STT_GNU_IFUNC symbol may require a PLT entry.
+ if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC
+ && this->reloc_needs_plt_for_ifunc(object, r_type))
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
+ }
+
switch (r_type)
{
case elfcpp::R_386_NONE:
// an R_386_RELATIVE relocation so the dynamic loader can
// relocate it easily.
if (parameters->options().output_is_position_independent())
- {
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
- rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE,
- output_section, data_shndx,
- reloc.get_r_offset());
- }
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE,
+ output_section, data_shndx,
+ reloc.get_r_offset());
+ }
break;
case elfcpp::R_386_16:
// data section, we need to be careful not to apply this
// relocation statically.
if (parameters->options().output_is_position_independent())
- {
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
- if (lsym.get_st_type() != elfcpp::STT_SECTION)
+ if (lsym.get_st_type() != elfcpp::STT_SECTION)
rel_dyn->add_local(object, r_sym, r_type, output_section,
data_shndx, reloc.get_r_offset());
- 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,
rel_dyn->add_local_section(object, shndx,
r_type, output_section,
data_shndx, reloc.get_r_offset());
- }
- }
+ }
+ }
break;
case elfcpp::R_386_PC32:
break;
case elfcpp::R_386_GOT32:
+ case elfcpp::R_386_GOT32X:
{
- // The symbol requires a GOT entry.
- Output_data_got<32, false>* got = target->got_section(symtab, layout);
- unsigned int r_sym = elfcpp::elf_r_sym<32>(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 RELATIVE relocation for this symbol's GOT entry.
- if (parameters->options().output_is_position_independent())
- {
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
- rel_dyn->add_local_relative(
- object, r_sym, elfcpp::R_386_RELATIVE, got,
- object->local_got_offset(r_sym, GOT_TYPE_STANDARD));
- }
- }
+ // We need GOT section.
+ Output_data_got<32, false>* got = target->got_section(symtab, layout);
+
+ // If the relocation symbol isn't IFUNC,
+ // and is local, then we will convert
+ // mov foo@GOT(%reg), %reg
+ // to
+ // lea foo@GOTOFF(%reg), %reg
+ // in Relocate::relocate.
+ if (reloc.get_r_offset() >= 2
+ && lsym.get_st_type() != elfcpp::STT_GNU_IFUNC)
+ {
+ section_size_type stype;
+ const unsigned char* view = object->section_contents(data_shndx,
+ &stype, true);
+ if (view[reloc.get_r_offset() - 2] == 0x8b)
+ break;
+ }
+
+ // Otherwise, the symbol requires a GOT entry.
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(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 (lsym.get_st_type() == elfcpp::STT_GNU_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 RELATIVE relocation for this symbol's GOT entry.
+ if (parameters->options().output_is_position_independent())
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ unsigned int got_offset =
+ object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
+ rel_dyn->add_local_relative(object, r_sym,
+ elfcpp::R_386_RELATIVE,
+ got, got_offset);
+ }
+ }
}
break;
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_RELATIVE:
+ case elfcpp::R_386_IRELATIVE:
case elfcpp::R_386_TLS_TPOFF:
case elfcpp::R_386_TLS_DTPMOD32:
case elfcpp::R_386_TLS_DTPOFF32:
{
bool output_is_shared = parameters->options().shared();
const tls::Tls_optimization optimized_type
- = Target_i386::optimize_tls_reloc(!output_is_shared, r_type);
+ = Target_i386::optimize_tls_reloc(!output_is_shared, r_type);
switch (r_type)
{
case elfcpp::R_386_TLS_GD: // Global-dynamic
if (optimized_type == tls::TLSOPT_NONE)
{
- // Create a pair of GOT entries for the module index and
- // dtv-relative offset.
- Output_data_got<32, false>* got
- = target->got_section(symtab, layout);
- unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ // Create a pair of GOT entries for the module index and
+ // dtv-relative offset.
+ Output_data_got<32, false>* got
+ = target->got_section(symtab, layout);
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(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
+ else
got->add_local_pair_with_rel(object, r_sym, shndx,
GOT_TYPE_TLS_PAIR,
target->rel_dyn_section(layout),
- elfcpp::R_386_TLS_DTPMOD32, 0);
+ elfcpp::R_386_TLS_DTPMOD32);
}
else if (optimized_type != tls::TLSOPT_TO_LE)
unsupported_reloc_local(object, r_type);
case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva)
target->define_tls_base_symbol(symtab, layout);
- if (optimized_type == tls::TLSOPT_NONE)
- {
- // Create a double GOT entry with an R_386_TLS_DESC
- // reloc. The R_386_TLS_DESC 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.
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a double GOT entry with an R_386_TLS_DESC
+ // reloc. The R_386_TLS_DESC 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<32, false>* got = target->got_tlsdesc_section();
- unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ Output_data_got<32, false>* got = target->got_tlsdesc_section();
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
{
unsigned int got_offset = got->add_constant(0);
Reloc_section* rt = target->rel_tls_desc_section(layout);
rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset);
}
- }
- else if (optimized_type != tls::TLSOPT_TO_LE)
- unsupported_reloc_local(object, r_type);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_local(object, r_type);
break;
case elfcpp::R_386_TLS_DESC_CALL:
case elfcpp::R_386_TLS_LDM: // 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);
layout->set_has_static_tls();
if (optimized_type == tls::TLSOPT_NONE)
{
- // For the R_386_TLS_IE relocation, we need to create a
- // dynamic relocation when building a shared library.
- if (r_type == elfcpp::R_386_TLS_IE
- && parameters->options().shared())
- {
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- unsigned int r_sym
- = elfcpp::elf_r_sym<32>(reloc.get_r_info());
- rel_dyn->add_local_relative(object, r_sym,
- elfcpp::R_386_RELATIVE,
- output_section, data_shndx,
- reloc.get_r_offset());
- }
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<32, false>* got
- = target->got_section(symtab, layout);
- unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
- unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32
- ? elfcpp::R_386_TLS_TPOFF32
- : elfcpp::R_386_TLS_TPOFF);
- unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
- ? GOT_TYPE_TLS_OFFSET
- : GOT_TYPE_TLS_NOFFSET);
- got->add_local_with_rel(object, r_sym, got_type,
- target->rel_dyn_section(layout),
- dyn_r_type);
+ // For the R_386_TLS_IE relocation, we need to create a
+ // dynamic relocation when building a shared library.
+ if (r_type == elfcpp::R_386_TLS_IE
+ && parameters->options().shared())
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ unsigned int r_sym
+ = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ rel_dyn->add_local_relative(object, r_sym,
+ elfcpp::R_386_RELATIVE,
+ output_section, data_shndx,
+ reloc.get_r_offset());
+ }
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<32, false>* got
+ = target->got_section(symtab, layout);
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32
+ ? elfcpp::R_386_TLS_TPOFF32
+ : elfcpp::R_386_TLS_TPOFF);
+ unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
+ ? GOT_TYPE_TLS_OFFSET
+ : GOT_TYPE_TLS_NOFFSET);
+ got->add_local_with_rel(object, r_sym, got_type,
+ target->rel_dyn_section(layout),
+ dyn_r_type);
}
else if (optimized_type != tls::TLSOPT_TO_LE)
unsupported_reloc_local(object, r_type);
layout->set_has_static_tls();
if (output_is_shared)
{
- // We need to create a dynamic relocation.
- gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
- unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
- unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32
- ? elfcpp::R_386_TLS_TPOFF32
- : elfcpp::R_386_TLS_TPOFF);
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- rel_dyn->add_local(object, r_sym, dyn_r_type, output_section,
- data_shndx, reloc.get_r_offset());
+ // We need to create a dynamic relocation.
+ gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32
+ ? elfcpp::R_386_TLS_TPOFF32
+ : elfcpp::R_386_TLS_TPOFF);
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_local(object, r_sym, dyn_r_type, output_section,
+ data_shndx, reloc.get_r_offset());
}
break;
// Report an unsupported relocation against a global symbol.
void
-Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object,
- unsigned int r_type,
- Symbol* gsym)
+Target_i386::Scan::unsupported_reloc_global(
+ Sized_relobj_file<32, 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());
case elfcpp::R_386_8:
case elfcpp::R_386_GOTOFF:
case elfcpp::R_386_GOT32:
+ case elfcpp::R_386_GOT32X:
{
- return true;
+ return true;
}
default:
return false;
Symbol_table* ,
Layout* ,
Target_i386* ,
- Sized_relobj<32, false>* ,
+ Sized_relobj_file<32, false>* ,
unsigned int ,
Output_section* ,
const elfcpp::Rel<32, false>& ,
Symbol_table* ,
Layout* ,
Target_i386* ,
- Sized_relobj<32, false>* ,
+ Sized_relobj_file<32, false>* ,
unsigned int ,
Output_section* ,
const elfcpp::Rel<32, false>& ,
inline void
Target_i386::Scan::global(Symbol_table* symtab,
- Layout* layout,
- Target_i386* target,
- Sized_relobj<32, false>* object,
- unsigned int data_shndx,
- Output_section* output_section,
- const elfcpp::Rel<32, false>& reloc,
- unsigned int r_type,
- Symbol* gsym)
+ Layout* layout,
+ Target_i386* target,
+ Sized_relobj_file<32, false>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rel<32, 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_386_NONE:
case elfcpp::R_386_16:
case elfcpp::R_386_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 (gsym->may_need_copy_reloc())
- {
- target->copy_reloc(symtab, layout, object,
- data_shndx, output_section, gsym, reloc);
- }
- else if (r_type == elfcpp::R_386_32
- && gsym->can_use_relative_reloc(false))
- {
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
- output_section, object,
- data_shndx, reloc.get_r_offset());
- }
- else
- {
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- rel_dyn->add_global(gsym, r_type, output_section, object,
- data_shndx, reloc.get_r_offset());
- }
- }
+ // 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 (r_type == elfcpp::R_386_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* rel_dyn = target->rel_irelative_section(layout);
+ rel_dyn->add_symbolless_global_addend(gsym,
+ elfcpp::R_386_IRELATIVE,
+ output_section,
+ object, data_shndx,
+ reloc.get_r_offset());
+ }
+ else if (r_type == elfcpp::R_386_32
+ && gsym->can_use_relative_reloc(false))
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
+ output_section, object,
+ data_shndx, reloc.get_r_offset());
+ }
+ else
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_global(gsym, r_type, output_section, object,
+ data_shndx, reloc.get_r_offset());
+ }
+ }
}
break;
case elfcpp::R_386_PC16:
case elfcpp::R_386_PC8:
{
- // Make a PLT entry if necessary.
- if (gsym->needs_plt_entry())
- {
- // These relocations are used for function calls only in
- // non-PIC code. For a 32-bit relocation in a shared library,
- // we'll need a text relocation anyway, so we can skip the
- // PLT entry and let the dynamic linker bind the call directly
- // to the target. For smaller relocations, we should use a
- // PLT entry to ensure that the call can reach.
- if (!parameters->options().shared()
- || r_type != elfcpp::R_386_PC32)
- target->make_plt_entry(symtab, layout, gsym);
- }
- // Make a dynamic relocation if necessary.
- int flags = Symbol::NON_PIC_REF;
- if (gsym->is_func())
- flags |= Symbol::FUNCTION_CALL;
- if (gsym->needs_dynamic_reloc(flags))
- {
- if (gsym->may_need_copy_reloc())
- {
- target->copy_reloc(symtab, layout, object,
- data_shndx, output_section, gsym, reloc);
- }
- else
- {
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- rel_dyn->add_global(gsym, r_type, output_section, object,
- data_shndx, reloc.get_r_offset());
- }
- }
+ // Make a PLT entry if necessary.
+ if (gsym->needs_plt_entry())
+ {
+ // These relocations are used for function calls only in
+ // non-PIC code. For a 32-bit relocation in a shared library,
+ // we'll need a text relocation anyway, so we can skip the
+ // PLT entry and let the dynamic linker bind the call directly
+ // to the target. For smaller relocations, we should use a
+ // PLT entry to ensure that the call can reach.
+ if (!parameters->options().shared()
+ || r_type != elfcpp::R_386_PC32)
+ 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
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_global(gsym, r_type, output_section, object,
+ data_shndx, reloc.get_r_offset());
+ }
+ }
}
break;
case elfcpp::R_386_GOT32:
+ case elfcpp::R_386_GOT32X:
{
- // The symbol requires a GOT entry.
- Output_data_got<32, 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
- // GOT entry with a dynamic relocation.
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- if (gsym->is_from_dynobj()
- || gsym->is_undefined()
- || gsym->is_preemptible())
- got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
- rel_dyn, elfcpp::R_386_GLOB_DAT);
- else
- {
- if (got->add_global(gsym, GOT_TYPE_STANDARD))
- rel_dyn->add_global_relative(
- gsym, elfcpp::R_386_RELATIVE, got,
- gsym->got_offset(GOT_TYPE_STANDARD));
- }
- }
+ // The symbol requires a GOT section.
+ Output_data_got<32, false>* got = target->got_section(symtab, layout);
+
+ // If we convert this from
+ // mov foo@GOT(%reg), %reg
+ // to
+ // lea foo@GOTOFF(%reg), %reg
+ // in Relocate::relocate, then there is nothing to do here.
+ if (reloc.get_r_offset() >= 2
+ && Target_i386::can_convert_mov_to_lea(gsym))
+ {
+ section_size_type stype;
+ const unsigned char* view = object->section_contents(data_shndx,
+ &stype, true);
+ if (view[reloc.get_r_offset() - 2] == 0x8b)
+ break;
+ }
+
+ 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
+ // GOT entry with a dynamic relocation.
+ Reloc_section* rel_dyn = target->rel_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,
+ rel_dyn, elfcpp::R_386_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);
+ rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
+ got, got_off);
+ }
+ }
+ }
}
break;
// 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_386_GOTOFF:
+ // A GOT-relative reference must resolve locally.
+ if (!gsym->is_defined())
+ gold_error(_("%s: relocation R_386_GOTOFF against undefined symbol %s"
+ " cannot be used when making a shared object"),
+ object->name().c_str(), gsym->name());
+ else if (gsym->is_from_dynobj())
+ gold_error(_("%s: relocation R_386_GOTOFF against external symbol %s"
+ " cannot be used when making a shared object"),
+ object->name().c_str(), gsym->name());
+ else if (gsym->is_preemptible())
+ gold_error(_("%s: relocation R_386_GOTOFF against preemptible symbol %s"
+ " cannot be used when making a shared object"),
+ object->name().c_str(), gsym->name());
+ // We need a GOT section.
+ target->got_section(symtab, layout);
+ break;
+
case elfcpp::R_386_GOTPC:
// We need a GOT section.
target->got_section(symtab, layout);
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_RELATIVE:
+ case elfcpp::R_386_IRELATIVE:
case elfcpp::R_386_TLS_TPOFF:
case elfcpp::R_386_TLS_DTPMOD32:
case elfcpp::R_386_TLS_DTPOFF32:
{
const bool is_final = gsym->final_value_is_known();
const tls::Tls_optimization optimized_type
- = Target_i386::optimize_tls_reloc(is_final, r_type);
+ = Target_i386::optimize_tls_reloc(is_final, r_type);
switch (r_type)
{
case elfcpp::R_386_TLS_GD: // Global-dynamic
if (optimized_type == tls::TLSOPT_NONE)
{
- // Create a pair of GOT entries for the module index and
- // dtv-relative offset.
- Output_data_got<32, false>* got
- = target->got_section(symtab, layout);
- got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
- target->rel_dyn_section(layout),
- elfcpp::R_386_TLS_DTPMOD32,
- elfcpp::R_386_TLS_DTPOFF32);
+ // Create a pair of GOT entries for the module index and
+ // dtv-relative offset.
+ Output_data_got<32, false>* got
+ = target->got_section(symtab, layout);
+ got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
+ target->rel_dyn_section(layout),
+ elfcpp::R_386_TLS_DTPMOD32,
+ elfcpp::R_386_TLS_DTPOFF32);
}
else if (optimized_type == tls::TLSOPT_TO_IE)
{
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<32, false>* got
- = target->got_section(symtab, layout);
- got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET,
- target->rel_dyn_section(layout),
- elfcpp::R_386_TLS_TPOFF);
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<32, false>* got
+ = target->got_section(symtab, layout);
+ got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET,
+ target->rel_dyn_section(layout),
+ elfcpp::R_386_TLS_TPOFF);
}
else if (optimized_type != tls::TLSOPT_TO_LE)
unsupported_reloc_global(object, r_type, gsym);
case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url)
target->define_tls_base_symbol(symtab, layout);
- if (optimized_type == tls::TLSOPT_NONE)
- {
- // Create a double GOT entry with an R_386_TLS_DESC
- // reloc. The R_386_TLS_DESC 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.
+ if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Create a double GOT entry with an R_386_TLS_DESC
+ // reloc. The R_386_TLS_DESC 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<32, false>* got = target->got_tlsdesc_section();
+ Output_data_got<32, false>* got = target->got_tlsdesc_section();
Reloc_section* rt = target->rel_tls_desc_section(layout);
- got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
- elfcpp::R_386_TLS_DESC, 0);
- }
- else if (optimized_type == tls::TLSOPT_TO_IE)
- {
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<32, false>* got
- = target->got_section(symtab, layout);
- got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET,
- target->rel_dyn_section(layout),
- elfcpp::R_386_TLS_TPOFF);
- }
- else if (optimized_type != tls::TLSOPT_TO_LE)
- unsupported_reloc_global(object, r_type, gsym);
+ got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
+ elfcpp::R_386_TLS_DESC, 0);
+ }
+ else if (optimized_type == tls::TLSOPT_TO_IE)
+ {
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<32, false>* got
+ = target->got_section(symtab, layout);
+ got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET,
+ target->rel_dyn_section(layout),
+ elfcpp::R_386_TLS_TPOFF);
+ }
+ else if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_global(object, r_type, gsym);
break;
case elfcpp::R_386_TLS_DESC_CALL:
case elfcpp::R_386_TLS_LDM: // 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);
layout->set_has_static_tls();
if (optimized_type == tls::TLSOPT_NONE)
{
- // For the R_386_TLS_IE relocation, we need to create a
- // dynamic relocation when building a shared library.
- if (r_type == elfcpp::R_386_TLS_IE
- && parameters->options().shared())
- {
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
- output_section, object,
- data_shndx,
- reloc.get_r_offset());
- }
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<32, false>* got
- = target->got_section(symtab, layout);
- unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32
- ? elfcpp::R_386_TLS_TPOFF32
- : elfcpp::R_386_TLS_TPOFF);
- unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
- ? GOT_TYPE_TLS_OFFSET
- : GOT_TYPE_TLS_NOFFSET);
- got->add_global_with_rel(gsym, got_type,
- target->rel_dyn_section(layout),
- dyn_r_type);
+ // For the R_386_TLS_IE relocation, we need to create a
+ // dynamic relocation when building a shared library.
+ if (r_type == elfcpp::R_386_TLS_IE
+ && parameters->options().shared())
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
+ output_section, object,
+ data_shndx,
+ reloc.get_r_offset());
+ }
+ // Create a GOT entry for the tp-relative offset.
+ Output_data_got<32, false>* got
+ = target->got_section(symtab, layout);
+ unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32
+ ? elfcpp::R_386_TLS_TPOFF32
+ : elfcpp::R_386_TLS_TPOFF);
+ unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
+ ? GOT_TYPE_TLS_OFFSET
+ : GOT_TYPE_TLS_NOFFSET);
+ got->add_global_with_rel(gsym, got_type,
+ target->rel_dyn_section(layout),
+ dyn_r_type);
}
else if (optimized_type != tls::TLSOPT_TO_LE)
unsupported_reloc_global(object, r_type, gsym);
layout->set_has_static_tls();
if (parameters->options().shared())
{
- // We need to create a dynamic relocation.
- unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32
- ? elfcpp::R_386_TLS_TPOFF32
- : elfcpp::R_386_TLS_TPOFF);
- Reloc_section* rel_dyn = target->rel_dyn_section(layout);
- rel_dyn->add_global(gsym, dyn_r_type, output_section, object,
- data_shndx, reloc.get_r_offset());
+ // We need to create a dynamic relocation.
+ unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32
+ ? elfcpp::R_386_TLS_TPOFF32
+ : elfcpp::R_386_TLS_TPOFF);
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_global(gsym, dyn_r_type, output_section, object,
+ data_shndx, reloc.get_r_offset());
}
break;
void
Target_i386::gc_process_relocs(Symbol_table* symtab,
- Layout* layout,
- Sized_relobj<32, false>* object,
- unsigned int data_shndx,
- unsigned int,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_symbols)
-{
- gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL,
- Target_i386::Scan,
- Target_i386::Relocatable_size_for_reloc>(
+ Layout* layout,
+ Sized_relobj_file<32, false>* object,
+ unsigned int data_shndx,
+ unsigned int,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_symbols)
+{
+ gold::gc_process_relocs<32, false, Target_i386, Scan, Classify_reloc>(
symtab,
layout,
this,
void
Target_i386::scan_relocs(Symbol_table* symtab,
- Layout* layout,
- Sized_relobj<32, 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)
+ Layout* layout,
+ Sized_relobj_file<32, 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_RELA)
{
return;
}
- gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL,
- Target_i386::Scan>(
+ gold::scan_relocs<32, false, Target_i386, Scan, Classify_reloc>(
symtab,
layout,
this,
uint32_t data_size = this->got_plt_->current_data_size();
symtab->get_sized_symbol<32>(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 __rel_iplt symbols
+ // were defined if necessary, even if we didn't create a PLT.
+ static const Define_symbol_in_segment syms[] =
+ {
+ {
+ "__rel_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
+ },
+ {
+ "__rel_iplt_end", // name
+ elfcpp::PT_LOAD, // segment_type
+ elfcpp::PF_W, // segment_flags_set
+ elfcpp::PF(0), // segment_flags_clear
+ 0, // value
+ 0, // size
+ elfcpp::STT_NOTYPE, // type
+ elfcpp::STB_GLOBAL, // binding
+ elfcpp::STV_HIDDEN, // visibility
+ 0, // nonvis
+ Symbol::SEGMENT_START, // offset_from_base
+ true // only_if_ref
+ }
+ };
+
+ symtab->define_symbols(layout, 2, syms,
+ layout->script_options()->saw_sections_clause());
+ }
}
// Return whether a direct absolute static relocation needs to be applied.
inline bool
Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym,
- int ref_flags,
- bool is_32bit,
+ unsigned int r_type,
+ bool is_32bit,
Output_section* output_section)
{
// If the output section is not allocated, then we didn't call
if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0)
return true;
+ int ref_flags = Scan::get_reference_flags(r_type);
+
// For local symbols, we will have created a non-RELATIVE dynamic
// relocation only if (a) the output is position independent,
// (b) the relocation is absolute (not pc- or segment-relative), and
// (c) the relocation is not 32 bits wide.
if (gsym == NULL)
return !(parameters->options().output_is_position_independent()
- && (ref_flags & Symbol::ABSOLUTE_REF)
- && !is_32bit);
+ && (ref_flags & Symbol::ABSOLUTE_REF)
+ && !is_32bit);
// For global symbols, we use the same helper routines used in the
// scan pass. If we did not create a dynamic relocation, or if we
// relocation.
bool has_dyn = gsym->needs_dynamic_reloc(ref_flags);
bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF)
- && gsym->can_use_relative_reloc(ref_flags
- & Symbol::FUNCTION_CALL);
+ && gsym->can_use_relative_reloc(ref_flags
+ & Symbol::FUNCTION_CALL);
return !has_dyn || is_rel;
}
inline bool
Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo,
+ unsigned int,
Target_i386* target,
- Output_section *output_section,
+ Output_section* output_section,
size_t relnum,
- const elfcpp::Rel<32, false>& rel,
- unsigned int r_type,
+ const unsigned char* preloc,
const Sized_symbol<32>* gsym,
const Symbol_value<32>* psymval,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr address,
section_size_type view_size)
{
+ const elfcpp::Rel<32, false> rel(preloc);
+ unsigned int r_type = elfcpp::elf_r_type<32>(rel.get_r_info());
+
if (this->skip_call_tls_get_addr_)
{
if ((r_type != elfcpp::R_386_PLT32
- && r_type != elfcpp::R_386_PC32)
+ && r_type != elfcpp::R_386_GOT32X
+ && r_type != elfcpp::R_386_PC32)
|| gsym == NULL
|| strcmp(gsym->name(), "___tls_get_addr") != 0)
- gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
- _("missing expected TLS relocation"));
+ {
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("missing expected TLS relocation"));
+ this->skip_call_tls_get_addr_ = false;
+ }
else
{
this->skip_call_tls_get_addr_ = false;
}
}
+ if (view == NULL)
+ return true;
+
+ const Sized_relobj_file<32, false>* object = relinfo->object;
+
// Pick the value to use for symbols defined in shared objects.
Symbol_value<32> symval;
if (gsym != NULL
- && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8
- || r_type == elfcpp::R_386_PC16
- || r_type == elfcpp::R_386_PC32))
+ && gsym->type() == elfcpp::STT_GNU_IFUNC
+ && r_type == elfcpp::R_386_32
+ && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))
+ && gsym->can_use_relative_reloc(false)
+ && !gsym->is_from_dynobj()
+ && !gsym->is_undefined()
+ && !gsym->is_preemptible())
+ {
+ // In this case we are generating a R_386_IRELATIVE reloc. We
+ // want to use the real value of the symbol, not the PLT offset.
+ }
+ else if (gsym != NULL
+ && 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;
}
-
- const Sized_relobj<32, false>* object = relinfo->object;
-
- // Get the GOT offset if needed.
- // The GOT pointer points to the end of the GOT section.
- // 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;
- switch (r_type)
+ else if (gsym == NULL && psymval->is_ifunc_symbol())
{
- case elfcpp::R_386_GOT32:
- if (gsym != NULL)
- {
- 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<32>(rel.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;
-
- default:
- break;
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.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;
+ }
}
+ bool baseless;
+
switch (r_type)
{
case elfcpp::R_386_NONE:
break;
case elfcpp::R_386_32:
- if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true,
- output_section))
- Relocate_functions<32, false>::rel32(view, object, psymval);
+ if (should_apply_static_reloc(gsym, r_type, true, output_section))
+ Relocate_functions<32, false>::rel32(view, object, psymval);
break;
case elfcpp::R_386_PC32:
- {
- int ref_flags = Symbol::NON_PIC_REF;
- if (gsym != NULL && gsym->is_func())
- ref_flags |= Symbol::FUNCTION_CALL;
- if (should_apply_static_reloc(gsym, ref_flags, true, output_section))
- Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
- }
+ if (should_apply_static_reloc(gsym, r_type, true, output_section))
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
break;
case elfcpp::R_386_16:
- if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false,
- output_section))
- Relocate_functions<32, false>::rel16(view, object, psymval);
+ if (should_apply_static_reloc(gsym, r_type, false, output_section))
+ Relocate_functions<32, false>::rel16(view, object, psymval);
break;
case elfcpp::R_386_PC16:
- {
- int ref_flags = Symbol::NON_PIC_REF;
- if (gsym != NULL && gsym->is_func())
- ref_flags |= Symbol::FUNCTION_CALL;
- if (should_apply_static_reloc(gsym, ref_flags, false, output_section))
- Relocate_functions<32, false>::pcrel16(view, object, psymval, address);
- }
+ if (should_apply_static_reloc(gsym, r_type, false, output_section))
+ Relocate_functions<32, false>::pcrel16(view, object, psymval, address);
break;
case elfcpp::R_386_8:
- if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false,
- output_section))
- Relocate_functions<32, false>::rel8(view, object, psymval);
+ if (should_apply_static_reloc(gsym, r_type, false, output_section))
+ Relocate_functions<32, false>::rel8(view, object, psymval);
break;
case elfcpp::R_386_PC8:
- {
- int ref_flags = Symbol::NON_PIC_REF;
- if (gsym != NULL && gsym->is_func())
- ref_flags |= Symbol::FUNCTION_CALL;
- if (should_apply_static_reloc(gsym, ref_flags, false,
- output_section))
- Relocate_functions<32, false>::pcrel8(view, object, psymval, address);
- }
+ if (should_apply_static_reloc(gsym, r_type, false, output_section))
+ Relocate_functions<32, false>::pcrel8(view, object, psymval, address);
break;
case elfcpp::R_386_PLT32:
break;
case elfcpp::R_386_GOT32:
- gold_assert(have_got_offset);
- Relocate_functions<32, false>::rel32(view, got_offset);
+ case elfcpp::R_386_GOT32X:
+ baseless = (view[-1] & 0xc7) == 0x5;
+ // R_386_GOT32 and R_386_GOT32X don't work without base register
+ // when generating a position-independent output file.
+ if (baseless
+ && parameters->options().output_is_position_independent())
+ {
+ if(gsym)
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unexpected reloc %u against global symbol %s without base register in object file when generating a position-independent output file"),
+ r_type, gsym->demangled_name().c_str());
+ else
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unexpected reloc %u against local symbol without base register in object file when generating a position-independent output file"),
+ r_type);
+ }
+
+ // Convert
+ // mov foo@GOT(%reg), %reg
+ // to
+ // lea foo@GOTOFF(%reg), %reg
+ // if possible.
+ if (rel.get_r_offset() >= 2
+ && view[-2] == 0x8b
+ && ((gsym == NULL && !psymval->is_ifunc_symbol())
+ || (gsym != NULL
+ && Target_i386::can_convert_mov_to_lea(gsym))))
+ {
+ view[-2] = 0x8d;
+ elfcpp::Elf_types<32>::Elf_Addr value;
+ value = psymval->value(object, 0);
+ // Don't subtract the .got.plt section address for baseless
+ // addressing.
+ if (!baseless)
+ value -= target->got_plt_section()->address();
+ Relocate_functions<32, false>::rel32(view, value);
+ }
+ else
+ {
+ // The GOT pointer points to the end of the GOT section.
+ // We need to subtract the size of the GOT section to get
+ // the actual offset to use in the relocation.
+ unsigned int got_offset = 0;
+ if (gsym != NULL)
+ {
+ gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
+ got_offset = (gsym->got_offset(GOT_TYPE_STANDARD)
+ - target->got_size());
+ }
+ else
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.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());
+ }
+ // Add the .got.plt section address for baseless addressing.
+ if (baseless)
+ got_offset += target->got_plt_section()->address();
+ Relocate_functions<32, false>::rel32(view, got_offset);
+ }
break;
case elfcpp::R_386_GOTOFF:
{
- elfcpp::Elf_types<32>::Elf_Addr value;
- value = (psymval->value(object, 0)
- - target->got_plt_section()->address());
- Relocate_functions<32, false>::rel32(view, value);
+ elfcpp::Elf_types<32>::Elf_Addr reladdr;
+ reladdr = target->got_plt_section()->address();
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, reladdr);
}
break;
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_RELATIVE:
+ case elfcpp::R_386_IRELATIVE:
// These are outstanding tls relocs, which are unexpected when
// linking.
case elfcpp::R_386_TLS_TPOFF:
case elfcpp::R_386_TLS_LE: // Local-exec
case elfcpp::R_386_TLS_LE_32:
this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval,
- view, address, view_size);
+ view, address, view_size);
break;
case elfcpp::R_386_32PLT:
inline void
Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo,
- Target_i386* target,
+ Target_i386* target,
size_t relnum,
const elfcpp::Rel<32, false>& rel,
unsigned int r_type,
{
Output_segment* tls_segment = relinfo->layout->tls_segment();
- const Sized_relobj<32, false>* object = relinfo->object;
+ const Sized_relobj_file<32, false>* object = relinfo->object;
elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0);
case elfcpp::R_386_TLS_GD: // Global-dynamic
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,
rel, r_type, value, view,
view_size);
break;
}
else
- {
- unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
- ? GOT_TYPE_TLS_NOFFSET
- : 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<32>(rel.get_r_info());
- gold_assert(object->local_has_got_offset(r_sym, got_type));
- got_offset = (object->local_got_offset(r_sym, got_type)
+ {
+ unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
+ ? GOT_TYPE_TLS_NOFFSET
+ : 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<32>(rel.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 (optimized_type == tls::TLSOPT_TO_IE)
{
- gold_assert(tls_segment != NULL);
- this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
- got_offset, view, view_size);
- break;
+ this->tls_gd_to_ie(relinfo, relnum, rel, r_type,
+ got_offset, view, view_size);
+ break;
}
- else if (optimized_type == tls::TLSOPT_NONE)
- {
- // Relocate the field with the offset of the pair of GOT
- // entries.
- Relocate_functions<32, false>::rel32(view, got_offset);
- break;
- }
- }
+ else if (optimized_type == tls::TLSOPT_NONE)
+ {
+ // Relocate the field with the offset of the pair of GOT
+ // entries.
+ Relocate_functions<32, false>::rel32(view, got_offset);
+ break;
+ }
+ }
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
_("unsupported reloc %u"),
r_type);
case elfcpp::R_386_TLS_DESC_CALL:
this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
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,
- rel, r_type, value, view,
- view_size);
+ rel, r_type, value, view,
+ view_size);
break;
- }
+ }
else
- {
- unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
- ? GOT_TYPE_TLS_NOFFSET
- : GOT_TYPE_TLS_DESC);
- unsigned int got_offset = 0;
+ {
+ unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
+ ? GOT_TYPE_TLS_NOFFSET
+ : GOT_TYPE_TLS_DESC);
+ unsigned int got_offset = 0;
if (r_type == elfcpp::R_386_TLS_GOTDESC
&& optimized_type == tls::TLSOPT_NONE)
{
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<32>(rel.get_r_info());
- gold_assert(object->local_has_got_offset(r_sym, got_type));
- got_offset += (object->local_got_offset(r_sym, got_type)
+ 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<32>(rel.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 (optimized_type == tls::TLSOPT_TO_IE)
+ {
+ this->tls_desc_gd_to_ie(relinfo, relnum, rel, r_type,
+ got_offset, view, view_size);
+ break;
+ }
+ else if (optimized_type == tls::TLSOPT_NONE)
{
- gold_assert(tls_segment != NULL);
- this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
- got_offset, view, view_size);
- break;
+ if (r_type == elfcpp::R_386_TLS_GOTDESC)
+ {
+ // Relocate the field with the offset of the pair of GOT
+ // entries.
+ Relocate_functions<32, false>::rel32(view, got_offset);
+ }
+ break;
}
- else if (optimized_type == tls::TLSOPT_NONE)
- {
- if (r_type == elfcpp::R_386_TLS_GOTDESC)
- {
- // Relocate the field with the offset of the pair of GOT
- // entries.
- Relocate_functions<32, false>::rel32(view, got_offset);
- }
- break;
- }
- }
+ }
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
_("unsupported reloc %u"),
r_type);
this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
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, rel, 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());
- Relocate_functions<32, false>::rel32(view, got_offset);
- break;
- }
+ Relocate_functions<32, false>::rel32(view, got_offset);
+ break;
+ }
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
_("unsupported reloc %u"),
r_type);
elfcpp::Shdr<32, false> shdr(relinfo->data_shdr);
if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0)
{
- gold_assert(tls_segment != NULL);
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
value -= tls_segment->memsz();
}
}
case elfcpp::R_386_TLS_IE_32:
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;
+ }
Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
rel, 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.
+ {
+ // Relocate the field with the offset of the GOT entry for
+ // the tp-relative offset of the symbol.
unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
- ? GOT_TYPE_TLS_OFFSET
- : GOT_TYPE_TLS_NOFFSET);
- unsigned int got_offset;
- if (gsym != NULL)
- {
- gold_assert(gsym->has_got_offset(got_type));
- got_offset = gsym->got_offset(got_type);
- }
- else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
- gold_assert(object->local_has_got_offset(r_sym, got_type));
- got_offset = object->local_got_offset(r_sym, got_type);
- }
- // For the R_386_TLS_IE relocation, we need to apply the
- // absolute address of the GOT entry.
- if (r_type == elfcpp::R_386_TLS_IE)
- got_offset += target->got_plt_section()->address();
- // All GOT offsets are relative to the end of the GOT.
- got_offset -= target->got_size();
- Relocate_functions<32, false>::rel32(view, got_offset);
- break;
- }
+ ? GOT_TYPE_TLS_OFFSET
+ : GOT_TYPE_TLS_NOFFSET);
+ unsigned int got_offset;
+ if (gsym != NULL)
+ {
+ gold_assert(gsym->has_got_offset(got_type));
+ got_offset = gsym->got_offset(got_type);
+ }
+ else
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
+ gold_assert(object->local_has_got_offset(r_sym, got_type));
+ got_offset = object->local_got_offset(r_sym, got_type);
+ }
+ // For the R_386_TLS_IE relocation, we need to apply the
+ // absolute address of the GOT entry.
+ if (r_type == elfcpp::R_386_TLS_IE)
+ got_offset += target->got_plt_section()->address();
+ // All GOT offsets are relative to the end of the GOT.
+ got_offset -= target->got_size();
+ Relocate_functions<32, false>::rel32(view, got_offset);
+ break;
+ }
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
_("unsupported reloc %u"),
r_type);
// If we're creating a shared library, a dynamic relocation will
// have been created for this location, so do not apply it now.
if (!parameters->options().shared())
- {
- gold_assert(tls_segment != NULL);
- value -= tls_segment->memsz();
- Relocate_functions<32, false>::rel32(view, value);
- }
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
+ value -= tls_segment->memsz();
+ Relocate_functions<32, false>::rel32(view, value);
+ }
break;
case elfcpp::R_386_TLS_LE_32:
// If we're creating a shared library, a dynamic relocation will
// have been created for this location, so do not apply it now.
if (!parameters->options().shared())
- {
- gold_assert(tls_segment != NULL);
- value = tls_segment->memsz() - value;
- Relocate_functions<32, false>::rel32(view, value);
- }
+ {
+ if (tls_segment == NULL)
+ {
+ gold_assert(parameters->errors()->error_count() > 0
+ || issue_undefined_symbol_error(gsym));
+ return;
+ }
+ value = tls_segment->memsz() - value;
+ Relocate_functions<32, false>::rel32(view, value);
+ }
break;
}
}
unsigned char* view,
section_size_type view_size)
{
- // leal foo(,%reg,1),%eax; call ___tls_get_addr
+ // leal foo(,%ebx,1),%eax; call ___tls_get_addr@PLT
+ // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
+ // leal foo(%ebx),%eax; call ___tls_get_addr@PLT
// ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
- // leal foo(%reg),%eax; call ___tls_get_addr
+ // leal foo(%reg),%eax; call *___tls_get_addr@GOT(%reg)
// ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
unsigned char op1 = view[-1];
unsigned char op2 = view[-2];
+ unsigned char op3 = view[4];
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- op2 == 0x8d || op2 == 0x04);
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
+ op2 == 0x8d || op2 == 0x04);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ op3 == 0xe8 || op3 == 0xff);
int roff = 5;
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3);
tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d);
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
+ ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
}
else
{
+ unsigned char reg = op1 & 7;
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
- if (rel.get_r_offset() + 9 < view_size
- && view[9] == 0x90)
+ ((op1 & 0xf8) == 0x80
+ && reg != 4
+ && reg != 0
+ && (op3 == 0xe8 || (view[5] & 0x7) == reg)));
+ if (op3 == 0xff
+ || (rel.get_r_offset() + 9 < view_size
+ && view[9] == 0x90))
{
- // There is a trailing nop. Use the size byte subl.
+ // There is an indirect call or a trailing nop. Use the size
+ // byte subl.
memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
roff = 6;
}
inline void
Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo,
size_t relnum,
- Output_segment*,
const elfcpp::Rel<32, false>& rel,
unsigned int,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
section_size_type view_size)
{
- // leal foo(,%ebx,1),%eax; call ___tls_get_addr
+ // leal foo(,%ebx,1),%eax; call ___tls_get_addr@PLT
// ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
+ // leal foo(%ebx),%eax; call ___tls_get_addr@PLT; nop
+ // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
+ // leal foo(%reg),%eax; call *___tls_get_addr@GOT(%reg)
+ // ==> movl %gs:0,%eax; addl foo@gotntpoff(%reg),%eax
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
unsigned char op1 = view[-1];
unsigned char op2 = view[-2];
+ unsigned char op3 = view[4];
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- op2 == 0x8d || op2 == 0x04);
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
-
- int roff = 5;
+ op2 == 0x8d || op2 == 0x04);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ op3 == 0xe8 || op3 == 0xff);
- // FIXME: For now, support only the first (SIB) form.
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04);
+ int roff;
if (op2 == 0x04)
{
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3);
tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d);
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
- memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
+ ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
+ roff = 5;
}
else
{
+ unsigned char reg = op1 & 7;
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 10);
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
- if (rel.get_r_offset() + 9 < view_size
- && view[9] == 0x90)
- {
- // FIXME: This is not the right instruction sequence.
- // There is a trailing nop. Use the size byte subl.
- memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
- roff = 6;
- }
- else
- {
- // FIXME: This is not the right instruction sequence.
- // Use the five byte subl.
- memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
- }
+ ((op1 & 0xf8) == 0x80
+ && reg != 4
+ && reg != 0
+ && ((op3 == 0xe8 && view[9] == 0x90)
+ || (view[5] & 0x7) == reg)));
+ roff = 6;
}
+ memcpy(view + roff - 8, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
Relocate_functions<32, false>::rel32(view + roff, value);
// The next reloc should be a PLT32 reloc against __tls_get_addr.
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- view[-2] == 0x8d && view[-1] == 0x83);
+ view[-2] == 0x8d && view[-1] == 0x83);
view[-1] = 0x05;
value -= tls_segment->memsz();
Relocate_functions<32, false>::rel32(view, value);
gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL);
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2);
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- view[0] == 0xff && view[1] == 0x10);
+ view[0] == 0xff && view[1] == 0x10);
view[0] = 0x66;
view[1] = 0x90;
}
Target_i386::Relocate::tls_desc_gd_to_ie(
const Relocate_info<32, false>* relinfo,
size_t relnum,
- Output_segment*,
const elfcpp::Rel<32, false>& rel,
unsigned int r_type,
elfcpp::Elf_types<32>::Elf_Addr value,
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- view[-2] == 0x8d && view[-1] == 0x83);
+ view[-2] == 0x8d && view[-1] == 0x83);
view[-2] = 0x8b;
Relocate_functions<32, false>::rel32(view, value);
}
gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL);
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2);
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- view[0] == 0xff && view[1] == 0x10);
+ view[0] == 0xff && view[1] == 0x10);
view[0] = 0x66;
view[1] = 0x90;
}
unsigned char* view,
section_size_type view_size)
{
- // leal foo(%reg), %eax; call ___tls_get_addr
+ // leal foo(%ebx), %eax; call ___tls_get_addr@PLT
// ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
+ // leal foo(%reg), %eax; call call *___tls_get_addr@GOT(%reg)
+ // ==> movl %gs:0,%eax; leal (%esi),%esi
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
- tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
- // FIXME: Does this test really always pass?
+ unsigned char op1 = view[-1];
+ unsigned char op2 = view[-2];
+ unsigned char op3 = view[4];
+
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- view[-2] == 0x8d && view[-1] == 0x83);
+ op3 == 0xe8 || op3 == 0xff);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size,
+ op3 == 0xe8 ? 9 : 10);
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
+ // FIXME: Does this test really always pass?
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x8d);
+
+ unsigned char reg = op1 & 7;
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ ((op1 & 0xf8) == 0x80
+ && reg != 4
+ && reg != 0
+ && (op3 == 0xe8 || (view[5] & 0x7) == reg)));
- memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
+ if (op3 == 0xe8)
+ memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
+ else
+ memcpy(view - 2, "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0\0", 12);
// The next reloc should be a PLT32 reloc against __tls_get_addr.
// We can skip it.
{
// movl XX,%reg ==> movl $YY,%reg
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- (op1 & 0xc7) == 0x05);
+ (op1 & 0xc7) == 0x05);
view[-2] = 0xc7;
view[-1] = 0xc0 | ((op1 >> 3) & 7);
}
{
// addl XX,%reg ==> addl $YY,%reg
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- (op1 & 0xc7) == 0x05);
+ (op1 & 0xc7) == 0x05);
view[-2] = 0x81;
view[-1] = 0xc0 | ((op1 >> 3) & 7);
}
unsigned char op1 = view[-1];
unsigned char op2 = view[-2];
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- (op1 & 0xc0) == 0x80 && (op1 & 7) != 4);
+ (op1 & 0xc0) == 0x80 && (op1 & 7) != 4);
if (op2 == 0x8b)
{
// movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
{
gold_assert(sh_type == elfcpp::SHT_REL);
- gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL,
- Target_i386::Relocate>(
+ gold::relocate_section<32, false, Target_i386, Relocate,
+ gold::Default_comdat_behavior, Classify_reloc>(
relinfo,
this,
prelocs,
// link.
unsigned int
-Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
+Target_i386::Classify_reloc::get_size_for_reloc(
unsigned int r_type,
Relobj* object)
{
case elfcpp::R_386_32:
case elfcpp::R_386_PC32:
case elfcpp::R_386_GOT32:
+ case elfcpp::R_386_GOT32X:
case elfcpp::R_386_PLT32:
case elfcpp::R_386_GOTOFF:
case elfcpp::R_386_GOTPC:
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_RELATIVE:
+ case elfcpp::R_386_IRELATIVE:
case elfcpp::R_386_TLS_TPOFF:
case elfcpp::R_386_TLS_DTPMOD32:
case elfcpp::R_386_TLS_DTPOFF32:
void
Target_i386::scan_relocatable_relocs(Symbol_table* symtab,
Layout* layout,
- Sized_relobj<32, false>* object,
+ Sized_relobj_file<32, false>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
const unsigned char* plocal_symbols,
Relocatable_relocs* rr)
{
- gold_assert(sh_type == elfcpp::SHT_REL);
+ typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
+ Scan_relocatable_relocs;
- typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL,
- Relocatable_size_for_reloc> Scan_relocatable_relocs;
+ gold_assert(sh_type == elfcpp::SHT_REL);
- gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL,
- Scan_relocatable_relocs>(
+ gold::scan_relocatable_relocs<32, false, Scan_relocatable_relocs>(
symtab,
layout,
object,
rr);
}
-// Relocate a section during a relocatable link.
+// Scan the relocs for --emit-relocs.
+
+void
+Target_i386::emit_relocs_scan(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<32, 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_syms,
+ Relocatable_relocs* rr)
+{
+ typedef gold::Default_classify_reloc<elfcpp::SHT_REL, 32, false>
+ Classify_reloc;
+ typedef gold::Default_emit_relocs_strategy<Classify_reloc>
+ Emit_relocs_strategy;
+
+ gold_assert(sh_type == elfcpp::SHT_REL);
+
+ gold::scan_relocatable_relocs<32, false, Emit_relocs_strategy>(
+ symtab,
+ layout,
+ object,
+ data_shndx,
+ prelocs,
+ reloc_count,
+ output_section,
+ needs_special_offset_handling,
+ local_symbol_count,
+ plocal_syms,
+ rr);
+}
+
+// Emit relocations for a section.
void
-Target_i386::relocate_for_relocatable(
+Target_i386::relocate_relocs(
const Relocate_info<32, false>* relinfo,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
- off_t offset_in_output_section,
- const Relocatable_relocs* rr,
+ elfcpp::Elf_types<32>::Elf_Off offset_in_output_section,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr view_address,
section_size_type view_size,
{
gold_assert(sh_type == elfcpp::SHT_REL);
- gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>(
+ gold::relocate_relocs<32, false, Classify_reloc>(
relinfo,
prelocs,
reloc_count,
output_section,
offset_in_output_section,
- rr,
view,
view_address,
view_size,
Target_i386::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
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] = { '\x8d', '\x76', '\x00' }; // leal 0(%esi),%esi
+ const char nop4[4] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi
+ '\x00'};
+ const char nop5[5] = { '\x90', '\x8d', '\x74', // nop
+ '\x26', '\x00' }; // leal 0(%esi,1),%esi
+ const char nop6[6] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi
+ '\x00', '\x00', '\x00' };
+ const char nop7[7] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi
+ '\x00', '\x00', '\x00',
+ '\x00' };
+ const char nop8[8] = { '\x90', '\x8d', '\xb4', // nop
+ '\x26', '\x00', '\x00', // leal 0L(%esi,1),%esi
+ '\x00', '\x00' };
+ const char nop9[9] = { '\x89', '\xf6', '\x8d', // movl %esi,%esi
+ '\xbc', '\x27', '\x00', // leal 0L(%edi,1),%edi
+ '\x00', '\x00', '\x00' };
+ const char nop10[10] = { '\x8d', '\x76', '\x00', // leal 0(%esi),%esi
+ '\x8d', '\xbc', '\x27', // leal 0L(%edi,1),%edi
+ '\x00', '\x00', '\x00',
+ '\x00' };
+ const char nop11[11] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi
+ '\x00', '\x8d', '\xbc', // leal 0L(%edi,1),%edi
+ '\x27', '\x00', '\x00',
+ '\x00', '\x00' };
+ const char nop12[12] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi
+ '\x00', '\x00', '\x00', // leal 0L(%edi),%edi
+ '\x8d', '\xbf', '\x00',
+ '\x00', '\x00', '\x00' };
+ const char nop13[13] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi
+ '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi
+ '\x8d', '\xbc', '\x27',
+ '\x00', '\x00', '\x00',
+ '\x00' };
+ const char nop14[14] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi
+ '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi
+ '\x00', '\x8d', '\xbc',
+ '\x27', '\x00', '\x00',
+ '\x00', '\x00' };
+ const char nop15[15] = { '\xeb', '\x0d', '\x90', // jmp .+15
+ '\x90', '\x90', '\x90', // nop,nop,nop,...
+ '\x90', '\x90', '\x90',
+ '\x90', '\x90', '\x90',
+ '\x90', '\x90', '\x90' };
const char* nops[16] = {
NULL,
return std::string(nops[length], length);
}
+// 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.
+
+uint64_t
+Target_i386::do_ehframe_datarel_base() const
+{
+ gold_assert(this->global_offset_table_ != NULL);
+ Symbol* sym = this->global_offset_table_;
+ Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym);
+ return ssym->value();
+}
+
// Return whether SYM should be treated as a call to a non-split
// function. We don't want that to be true of a call to a
// get_pc_thunk function.
bool
-Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const
+Target_i386::do_is_call_to_non_split(const Symbol* sym,
+ const unsigned char*,
+ const unsigned char*,
+ section_size_type) const
{
return (sym->type() == elfcpp::STT_FUNC
&& !is_prefix_of("__i686.get_pc_thunk.", sym->name()));
}
// FNOFFSET in section SHNDX in OBJECT is the start of a function
-// compiled with -fstack-split. The function calls non-stack-split
+// 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.
void
Target_i386::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
+ section_offset_type fnoffset,
+ section_size_type fnsize,
+ const unsigned char*,
+ size_t,
+ 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.
*to = "__morestack_non_split";
}
-// The selector for i386 object files.
+// The selector for i386 object files. Note this is never instantiated
+// directly. It's only used in Target_selector_i386_nacl, below.
class Target_selector_i386 : public Target_selector_freebsd
{
public:
Target_selector_i386()
: Target_selector_freebsd(elfcpp::EM_386, 32, false,
- "elf32-i386", "elf32-i386-freebsd")
+ "elf32-i386", "elf32-i386-freebsd",
+ "elf_i386")
{ }
Target*
{ return new Target_i386(); }
};
-Target_selector_i386 target_selector_i386;
+// NaCl variant. It uses different PLT contents.
+
+class Output_data_plt_i386_nacl : public Output_data_plt_i386
+{
+ public:
+ Output_data_plt_i386_nacl(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative)
+ : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative)
+ { }
+
+ 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, plt_eh_frame_cie, plt_eh_frame_cie_size,
+ plt_eh_frame_fde, plt_eh_frame_fde_size);
+ }
+
+ // The size of an entry in the PLT.
+ static const int plt_entry_size = 64;
+
+ // 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];
+};
+
+class Output_data_plt_i386_nacl_exec : public Output_data_plt_i386_nacl
+{
+public:
+ Output_data_plt_i386_nacl_exec(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative)
+ : Output_data_plt_i386_nacl(layout, got_plt, got_irelative)
+ { }
+
+ protected:
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address);
+
+ virtual unsigned int
+ do_fill_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset);
+
+ private:
+ // The first entry in the PLT for an executable.
+ 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];
+};
+
+class Output_data_plt_i386_nacl_dyn : public Output_data_plt_i386_nacl
+{
+ public:
+ Output_data_plt_i386_nacl_dyn(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative)
+ : Output_data_plt_i386_nacl(layout, got_plt, got_irelative)
+ { }
+
+ protected:
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr);
+
+ virtual unsigned int
+ do_fill_plt_entry(unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset);
+
+ private:
+ // The first entry in the PLT for a shared object.
+ static const unsigned char first_plt_entry[plt_entry_size];
+
+ // Other entries in the PLT for a shared object.
+ static const unsigned char plt_entry[plt_entry_size];
+};
+
+class Target_i386_nacl : public Target_i386
+{
+ public:
+ Target_i386_nacl()
+ : Target_i386(&i386_nacl_info)
+ { }
+
+ protected:
+ virtual Output_data_plt_i386*
+ do_make_data_plt(Layout* layout,
+ Output_data_got_plt_i386* got_plt,
+ Output_data_space* got_irelative,
+ bool dyn)
+ {
+ if (dyn)
+ return new Output_data_plt_i386_nacl_dyn(layout, got_plt, got_irelative);
+ else
+ return new Output_data_plt_i386_nacl_exec(layout, got_plt, got_irelative);
+ }
+
+ virtual std::string
+ do_code_fill(section_size_type length) const;
+
+ private:
+ static const Target::Target_info i386_nacl_info;
+};
+
+const Target::Target_info Target_i386_nacl::i386_nacl_info =
+{
+ 32, // size
+ false, // is_big_endian
+ elfcpp::EM_386, // 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-x86-32.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_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
+ elfcpp::SHT_PROGBITS, // unwind_section_type
+};
+
+#define NACLMASK 0xe0 // 32-byte alignment mask
+
+const unsigned char
+Output_data_plt_i386_nacl_exec::first_plt_entry[plt_entry_size] =
+{
+ 0xff, 0x35, // pushl contents of memory address
+ 0, 0, 0, 0, // replaced with address of .got + 4
+ 0x8b, 0x0d, // movl contents of address, %ecx
+ 0, 0, 0, 0, // replaced with address of .got + 8
+ 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx
+ 0xff, 0xe1, // jmp *%ecx
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90
+};
+
+void
+Output_data_plt_i386_nacl_exec::do_fill_first_plt_entry(
+ unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address)
+{
+ memcpy(pov, first_plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4);
+ elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8);
+}
+
+// The first entry in the PLT for a shared object.
+
+const unsigned char
+Output_data_plt_i386_nacl_dyn::first_plt_entry[plt_entry_size] =
+{
+ 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
+ 0x8b, 0x4b, 0x08, // mov 0x8(%ebx), %ecx
+ 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx
+ 0xff, 0xe1, // jmp *%ecx
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90, // nops
+ 0x90, 0x90, 0x90, 0x90, 0x90 // nops
+};
+
+void
+Output_data_plt_i386_nacl_dyn::do_fill_first_plt_entry(
+ unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr)
+{
+ memcpy(pov, first_plt_entry, plt_entry_size);
+}
+
+// Subsequent entries in the PLT for an executable.
+
+const unsigned char
+Output_data_plt_i386_nacl_exec::plt_entry[plt_entry_size] =
+{
+ 0x8b, 0x0d, // movl contents of address, %ecx */
+ 0, 0, 0, 0, // replaced with address of symbol in .got
+ 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx
+ 0xff, 0xe1, // jmp *%ecx
+
+ // Pad to the next 32-byte boundary with nop instructions.
+ 0x90,
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+
+ // Lazy GOT entries point here (32-byte aligned).
+ 0x68, // pushl immediate
+ 0, 0, 0, 0, // replaced with offset into relocation table
+ 0xe9, // jmp relative
+ 0, 0, 0, 0, // replaced with offset to start of .plt
+
+ // Pad to the next 32-byte boundary with nop instructions.
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+ 0x90, 0x90
+};
+
+unsigned int
+Output_data_plt_i386_nacl_exec::do_fill_plt_entry(
+ unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr got_address,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset)
+{
+ memcpy(pov, plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
+ got_address + got_offset);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset);
+ elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4));
+ return 32;
+}
+
+// Subsequent entries in the PLT for a shared object.
+
+const unsigned char
+Output_data_plt_i386_nacl_dyn::plt_entry[plt_entry_size] =
+{
+ 0x8b, 0x8b, // movl offset(%ebx), %ecx
+ 0, 0, 0, 0, // replaced with offset of symbol in .got
+ 0x83, 0xe1, 0xe0, // andl $NACLMASK, %ecx
+ 0xff, 0xe1, // jmp *%ecx
+
+ // Pad to the next 32-byte boundary with nop instructions.
+ 0x90,
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+
+ // Lazy GOT entries point here (32-byte aligned).
+ 0x68, // pushl immediate
+ 0, 0, 0, 0, // replaced with offset into relocation table.
+ 0xe9, // jmp relative
+ 0, 0, 0, 0, // replaced with offset to start of .plt.
+
+ // Pad to the next 32-byte boundary with nop instructions.
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+ 0x90, 0x90
+};
+
+unsigned int
+Output_data_plt_i386_nacl_dyn::do_fill_plt_entry(
+ unsigned char* pov,
+ elfcpp::Elf_types<32>::Elf_Addr,
+ unsigned int got_offset,
+ unsigned int plt_offset,
+ unsigned int plt_rel_offset)
+{
+ memcpy(pov, plt_entry, plt_entry_size);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset);
+ elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset);
+ elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4));
+ return 32;
+}
+
+const unsigned char
+Output_data_plt_i386_nacl::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, 8, // DW_CFA_def_cfa_offset: 8.
+ elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
+ elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12.
+ 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_breg4, 4, // Push %esp + 4.
+ elfcpp::DW_OP_breg8, 0, // Push %eip.
+ elfcpp::DW_OP_const1u, 63, // Push 0x3f.
+ elfcpp::DW_OP_and, // & (%eip & 0x3f).
+ elfcpp::DW_OP_const1u, 37, // Push 0x25.
+ elfcpp::DW_OP_ge, // >= ((%eip & 0x3f) >= 0x25)
+ elfcpp::DW_OP_lit2, // Push 2.
+ elfcpp::DW_OP_shl, // << (((%eip & 0x3f) >= 0x25) << 2)
+ elfcpp::DW_OP_plus, // + ((((%eip&0x3f)>=0x25)<<2)+%esp+4
+ 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.
+std::string
+Target_i386_nacl::do_code_fill(section_size_type length) const
+{
+ return std::string(length, static_cast<char>(0x90));
+}
+
+// The selector for i386-nacl object files.
+
+class Target_selector_i386_nacl
+ : public Target_selector_nacl<Target_selector_i386, Target_i386_nacl>
+{
+ public:
+ Target_selector_i386_nacl()
+ : Target_selector_nacl<Target_selector_i386,
+ Target_i386_nacl>("x86-32",
+ "elf32-i386-nacl",
+ "elf_i386_nacl")
+ { }
+};
+
+Target_selector_i386_nacl target_selector_i386;
+
+// IAMCU variant. It uses EM_IAMCU, not EM_386.
+
+class Target_iamcu : public Target_i386
+{
+ public:
+ Target_iamcu()
+ : Target_i386(&iamcu_info)
+ { }
+
+ private:
+ // Information about this specific target which we pass to the
+ // general Target structure.
+ static const Target::Target_info iamcu_info;
+};
+
+const Target::Target_info Target_iamcu::iamcu_info =
+{
+ 32, // size
+ false, // is_big_endian
+ elfcpp::EM_IAMCU, // 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
+ "/usr/lib/libc.so.1", // dynamic_linker
+ 0x08048000, // 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_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
+ elfcpp::SHT_PROGBITS, // unwind_section_type
+};
+
+class Target_selector_iamcu : public Target_selector
+{
+public:
+ Target_selector_iamcu()
+ : Target_selector(elfcpp::EM_IAMCU, 32, false, "elf32-iamcu",
+ "elf_iamcu")
+ { }
+
+ Target*
+ do_instantiate_target()
+ { return new Target_iamcu(); }
+};
+
+Target_selector_iamcu target_selector_iamcu;
} // End anonymous namespace.
projects / thirdparty / binutils-gdb.git / blobdiff