| Line 1... |
Line 1... |
// i386.cc -- i386 target support for gold.
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// i386.cc -- i386 target support for gold.
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|
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// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// This program is free software; you can redistribute it and/or modify
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| Line 23... |
Line 23... |
#include "gold.h"
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#include "gold.h"
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#include <cstring>
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#include <cstring>
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#include "elfcpp.h"
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#include "elfcpp.h"
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#include "dwarf.h"
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#include "parameters.h"
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#include "parameters.h"
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#include "reloc.h"
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#include "reloc.h"
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#include "i386.h"
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#include "i386.h"
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#include "object.h"
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#include "object.h"
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#include "symtab.h"
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#include "symtab.h"
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| Line 50... |
Line 51... |
class Output_data_plt_i386 : public Output_section_data
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class Output_data_plt_i386 : public Output_section_data
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{
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{
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public:
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public:
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typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
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typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
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Output_data_plt_i386(Symbol_table*, Layout*, Output_data_space*);
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Output_data_plt_i386(Layout*, Output_data_space*, Output_data_space*);
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// Add an entry to the PLT.
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// Add an entry to the PLT.
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void
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void
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add_entry(Symbol* gsym);
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add_entry(Symbol_table*, Layout*, Symbol* gsym);
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// Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
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// Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
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unsigned int
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unsigned int
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add_local_ifunc_entry(Sized_relobj_file<32, false>* relobj,
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add_local_ifunc_entry(Symbol_table*, Layout*,
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Sized_relobj_file<32, false>* relobj,
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unsigned int local_sym_index);
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unsigned int local_sym_index);
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// Return the .rel.plt section data.
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// Return the .rel.plt section data.
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Reloc_section*
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Reloc_section*
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rel_plt() const
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rel_plt() const
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| Line 70... |
Line 72... |
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// Return where the TLS_DESC relocations should go.
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// Return where the TLS_DESC relocations should go.
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Reloc_section*
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Reloc_section*
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rel_tls_desc(Layout*);
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rel_tls_desc(Layout*);
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// Return where the IRELATIVE relocations should go.
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Reloc_section*
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rel_irelative(Symbol_table*, Layout*);
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// Return whether we created a section for IRELATIVE relocations.
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bool
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has_irelative_section() const
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{ return this->irelative_rel_ != NULL; }
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// Return the number of PLT entries.
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// Return the number of PLT entries.
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unsigned int
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unsigned int
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entry_count() const
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entry_count() const
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{ return this->count_; }
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{ return this->count_ + this->irelative_count_; }
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// Return the offset of the first non-reserved PLT entry.
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// Return the offset of the first non-reserved PLT entry.
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static unsigned int
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static unsigned int
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first_plt_entry_offset()
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first_plt_entry_offset()
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{ return plt_entry_size; }
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{ return plt_entry_size; }
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| Line 85... |
Line 96... |
// Return the size of a PLT entry.
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// Return the size of a PLT entry.
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static unsigned int
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static unsigned int
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get_plt_entry_size()
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get_plt_entry_size()
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{ return plt_entry_size; }
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{ return plt_entry_size; }
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// Return the PLT address to use for a global symbol.
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uint64_t
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address_for_global(const Symbol*);
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// Return the PLT address to use for a local symbol.
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uint64_t
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address_for_local(const Relobj*, unsigned int symndx);
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protected:
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protected:
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void
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void
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do_adjust_output_section(Output_section* os);
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do_adjust_output_section(Output_section* os);
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// Write to a map file.
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// Write to a map file.
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| Line 99... |
Line 118... |
private:
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private:
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// The size of an entry in the PLT.
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// The size of an entry in the PLT.
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static const int plt_entry_size = 16;
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static const int plt_entry_size = 16;
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// The first entry in the PLT for an executable.
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// The first entry in the PLT for an executable.
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static unsigned char exec_first_plt_entry[plt_entry_size];
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static const unsigned char exec_first_plt_entry[plt_entry_size];
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// The first entry in the PLT for a shared object.
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// The first entry in the PLT for a shared object.
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static unsigned char dyn_first_plt_entry[plt_entry_size];
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static const unsigned char dyn_first_plt_entry[plt_entry_size];
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// Other entries in the PLT for an executable.
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// Other entries in the PLT for an executable.
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static unsigned char exec_plt_entry[plt_entry_size];
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static const unsigned char exec_plt_entry[plt_entry_size];
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// Other entries in the PLT for a shared object.
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// Other entries in the PLT for a shared object.
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static unsigned char dyn_plt_entry[plt_entry_size];
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static const unsigned char dyn_plt_entry[plt_entry_size];
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// The .eh_frame unwind information for the PLT.
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static const int plt_eh_frame_cie_size = 16;
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static const int plt_eh_frame_fde_size = 32;
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static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
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static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
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// Set the final size.
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// Set the final size.
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void
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void
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set_final_data_size()
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set_final_data_size()
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{ this->set_data_size((this->count_ + 1) * plt_entry_size); }
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{
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this->set_data_size((this->count_ + this->irelative_count_ + 1)
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* plt_entry_size);
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}
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// Write out the PLT data.
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// Write out the PLT data.
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void
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void
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do_write(Output_file*);
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do_write(Output_file*);
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| Line 136... |
Line 164... |
Sized_relobj_file<32, false>* object;
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Sized_relobj_file<32, false>* object;
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unsigned int local_sym_index;
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unsigned int local_sym_index;
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unsigned int got_offset;
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unsigned int got_offset;
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};
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};
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// A pointer to the Layout class, so that we can find the .dynamic
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// section when we write out the GOT PLT section.
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Layout* layout_;
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// The reloc section.
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// The reloc section.
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Reloc_section* rel_;
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Reloc_section* rel_;
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// The TLS_DESC relocations, if necessary. These must follow the
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// The TLS_DESC relocations, if necessary. These must follow the
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// regular PLT relocs.
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// regular PLT relocs.
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Reloc_section* tls_desc_rel_;
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Reloc_section* tls_desc_rel_;
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// The IRELATIVE relocations, if necessary. These must follow the
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// regular relocatoins and the TLS_DESC relocations.
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Reloc_section* irelative_rel_;
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// The .got.plt section.
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// The .got.plt section.
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Output_data_space* got_plt_;
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Output_data_space* got_plt_;
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// The part of the .got.plt section used for IRELATIVE relocs.
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Output_data_space* got_irelative_;
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// The number of PLT entries.
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// The number of PLT entries.
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unsigned int count_;
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unsigned int count_;
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// Number of PLT entries with R_386_IRELATIVE relocs. These follow
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// the regular PLT entries.
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unsigned int irelative_count_;
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// Global STT_GNU_IFUNC symbols.
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// Global STT_GNU_IFUNC symbols.
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std::vector<Global_ifunc> global_ifuncs_;
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std::vector<Global_ifunc> global_ifuncs_;
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// Local STT_GNU_IFUNC symbols.
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// Local STT_GNU_IFUNC symbols.
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std::vector<Local_ifunc> local_ifuncs_;
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std::vector<Local_ifunc> local_ifuncs_;
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};
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};
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| Line 156... |
Line 195... |
// The i386 target class.
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// The i386 target class.
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// TLS info comes from
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// TLS info comes from
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// http://people.redhat.com/drepper/tls.pdf
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// http://people.redhat.com/drepper/tls.pdf
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// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
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// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
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class Target_i386 : public Target_freebsd<32, false>
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class Target_i386 : public Sized_target<32, false>
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{
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{
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public:
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public:
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typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
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typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
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Target_i386()
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Target_i386()
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: Target_freebsd<32, false>(&i386_info),
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: Sized_target<32, false>(&i386_info),
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got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL),
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got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
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global_offset_table_(NULL), rel_dyn_(NULL),
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got_tlsdesc_(NULL), global_offset_table_(NULL), rel_dyn_(NULL),
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copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL),
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rel_irelative_(NULL), copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL),
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got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
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got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
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{ }
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{ }
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inline bool
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can_check_for_function_pointers() const
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{ return true; }
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virtual bool
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can_icf_inline_merge_sections () const
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{ return true; }
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// Process the relocations to determine unreferenced sections for
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// Process the relocations to determine unreferenced sections for
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// garbage collection.
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// garbage collection.
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void
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void
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gc_process_relocs(Symbol_table* symtab,
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gc_process_relocs(Symbol_table* symtab,
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Layout* layout,
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Layout* layout,
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| Line 280... |
Line 311... |
if (name[0] == '.' && name[1] == 'X')
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if (name[0] == '.' && name[1] == 'X')
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return true;
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return true;
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return Target::do_is_local_label_name(name);
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return Target::do_is_local_label_name(name);
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}
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}
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|
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// Return the PLT section.
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// Return the PLT address to use for a global symbol.
|
Output_data*
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uint64_t
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do_plt_section_for_global(const Symbol*) const
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do_plt_address_for_global(const Symbol* gsym) const
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{ return this->plt_section(); }
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{ return this->plt_section()->address_for_global(gsym); }
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|
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Output_data*
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uint64_t
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do_plt_section_for_local(const Relobj*, unsigned int) const
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do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
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{ return this->plt_section(); }
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{ return this->plt_section()->address_for_local(relobj, symndx); }
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// We can tell whether we take the address of a function.
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inline bool
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do_can_check_for_function_pointers() const
|
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{ return true; }
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// Return the base for a DW_EH_PE_datarel encoding.
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uint64_t
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do_ehframe_datarel_base() const;
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// Return whether SYM is call to a non-split function.
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// Return whether SYM is call to a non-split function.
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bool
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bool
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do_is_call_to_non_split(const Symbol* sym, unsigned int) const;
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do_is_call_to_non_split(const Symbol* sym, unsigned int) const;
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|
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| Line 579... |
Line 619... |
|
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// Get the section to use for TLS_DESC relocations.
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// Get the section to use for TLS_DESC relocations.
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Reloc_section*
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Reloc_section*
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rel_tls_desc_section(Layout*) const;
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rel_tls_desc_section(Layout*) const;
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// Get the section to use for IRELATIVE relocations.
|
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Reloc_section*
|
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rel_irelative_section(Layout*);
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// Add a potential copy relocation.
|
// Add a potential copy relocation.
|
void
|
void
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copy_reloc(Symbol_table* symtab, Layout* layout,
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copy_reloc(Symbol_table* symtab, Layout* layout,
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Sized_relobj_file<32, false>* object,
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Sized_relobj_file<32, false>* object,
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unsigned int shndx, Output_section* output_section,
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unsigned int shndx, Output_section* output_section,
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| Line 615... |
Line 659... |
Output_data_got<32, false>* got_;
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Output_data_got<32, false>* got_;
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// The PLT section.
|
// The PLT section.
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Output_data_plt_i386* plt_;
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Output_data_plt_i386* plt_;
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// The GOT PLT section.
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// The GOT PLT section.
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Output_data_space* got_plt_;
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Output_data_space* got_plt_;
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// The GOT section for IRELATIVE relocations.
|
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Output_data_space* got_irelative_;
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// The GOT section for TLSDESC relocations.
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// The GOT section for TLSDESC relocations.
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Output_data_got<32, false>* got_tlsdesc_;
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Output_data_got<32, false>* got_tlsdesc_;
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// The _GLOBAL_OFFSET_TABLE_ symbol.
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// The _GLOBAL_OFFSET_TABLE_ symbol.
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Symbol* global_offset_table_;
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Symbol* global_offset_table_;
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// The dynamic reloc section.
|
// The dynamic reloc section.
|
Reloc_section* rel_dyn_;
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Reloc_section* rel_dyn_;
|
|
// The section to use for IRELATIVE relocs.
|
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Reloc_section* rel_irelative_;
|
// Relocs saved to avoid a COPY reloc.
|
// Relocs saved to avoid a COPY reloc.
|
Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_;
|
Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_;
|
// Space for variables copied with a COPY reloc.
|
// Space for variables copied with a COPY reloc.
|
Output_data_space* dynbss_;
|
Output_data_space* dynbss_;
|
// Offset of the GOT entry for the TLS module index.
|
// Offset of the GOT entry for the TLS module index.
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| Line 640... |
Line 688... |
elfcpp::EM_386, // machine_code
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elfcpp::EM_386, // machine_code
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false, // has_make_symbol
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false, // has_make_symbol
|
false, // has_resolve
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false, // has_resolve
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true, // has_code_fill
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true, // has_code_fill
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true, // is_default_stack_executable
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true, // is_default_stack_executable
|
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true, // can_icf_inline_merge_sections
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'\0', // wrap_char
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'\0', // wrap_char
|
"/usr/lib/libc.so.1", // dynamic_linker
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"/usr/lib/libc.so.1", // dynamic_linker
|
0x08048000, // default_text_segment_address
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0x08048000, // default_text_segment_address
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0x1000, // abi_pagesize (overridable by -z max-page-size)
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0x1000, // abi_pagesize (overridable by -z max-page-size)
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0x1000, // common_pagesize (overridable by -z common-page-size)
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0x1000, // common_pagesize (overridable by -z common-page-size)
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| Line 664... |
Line 713... |
{
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{
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gold_assert(symtab != NULL && layout != NULL);
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gold_assert(symtab != NULL && layout != NULL);
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|
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this->got_ = new Output_data_got<32, false>();
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this->got_ = new Output_data_got<32, false>();
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|
|
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// When using -z now, we can treat .got.plt as a relro section.
|
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// Without -z now, it is modified after program startup by lazy
|
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// PLT relocations.
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bool is_got_plt_relro = parameters->options().now();
|
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Output_section_order got_order = (is_got_plt_relro
|
|
? ORDER_RELRO
|
|
: ORDER_RELRO_LAST);
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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,
|
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
|
(elfcpp::SHF_ALLOC
|
(elfcpp::SHF_ALLOC
|
| elfcpp::SHF_WRITE),
|
| elfcpp::SHF_WRITE),
|
this->got_, ORDER_RELRO_LAST, true);
|
this->got_, got_order, true);
|
|
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this->got_plt_ = new Output_data_space(4, "** GOT PLT");
|
this->got_plt_ = new Output_data_space(4, "** GOT PLT");
|
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
|
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
|
(elfcpp::SHF_ALLOC
|
(elfcpp::SHF_ALLOC
|
| elfcpp::SHF_WRITE),
|
| elfcpp::SHF_WRITE),
|
this->got_plt_, ORDER_NON_RELRO_FIRST,
|
this->got_plt_, got_plt_order,
|
false);
|
is_got_plt_relro);
|
|
|
// The first three entries are reserved.
|
// The first three entries are reserved.
|
this->got_plt_->set_current_data_size(3 * 4);
|
this->got_plt_->set_current_data_size(3 * 4);
|
|
|
|
if (!is_got_plt_relro)
|
|
{
|
// Those bytes can go into the relro segment.
|
// Those bytes can go into the relro segment.
|
layout->increase_relro(3 * 4);
|
layout->increase_relro(3 * 4);
|
|
}
|
|
|
// Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
|
// Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
|
this->global_offset_table_ =
|
this->global_offset_table_ =
|
symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
|
symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
|
Symbol_table::PREDEFINED,
|
Symbol_table::PREDEFINED,
|
| Line 692... |
Line 755... |
0, 0, elfcpp::STT_OBJECT,
|
0, 0, elfcpp::STT_OBJECT,
|
elfcpp::STB_LOCAL,
|
elfcpp::STB_LOCAL,
|
elfcpp::STV_HIDDEN, 0,
|
elfcpp::STV_HIDDEN, 0,
|
false, false);
|
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
|
// If there are any TLSDESC relocations, they get GOT entries in
|
// .got.plt after the jump slot entries.
|
// .got.plt after the jump slot entries.
|
this->got_tlsdesc_ = new Output_data_got<32, false>();
|
this->got_tlsdesc_ = new Output_data_got<32, false>();
|
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
|
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
|
(elfcpp::SHF_ALLOC
|
(elfcpp::SHF_ALLOC
|
| elfcpp::SHF_WRITE),
|
| elfcpp::SHF_WRITE),
|
this->got_tlsdesc_,
|
this->got_tlsdesc_,
|
ORDER_NON_RELRO_FIRST, false);
|
got_plt_order, is_got_plt_relro);
|
}
|
}
|
|
|
return this->got_;
|
return this->got_;
|
}
|
}
|
|
|
| Line 721... |
Line 793... |
ORDER_DYNAMIC_RELOCS, false);
|
ORDER_DYNAMIC_RELOCS, false);
|
}
|
}
|
return this->rel_dyn_;
|
return this->rel_dyn_;
|
}
|
}
|
|
|
|
// 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.
|
|
|
|
Target_i386::Reloc_section*
|
|
Target_i386::rel_irelative_section(Layout* layout)
|
|
{
|
|
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_;
|
|
}
|
|
|
// Create the PLT section. The ordinary .got section is an argument,
|
// 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
|
// since we need to refer to the start. We also create our own .got
|
// section just for PLT entries.
|
// section just for PLT entries.
|
|
|
Output_data_plt_i386::Output_data_plt_i386(Symbol_table* symtab,
|
Output_data_plt_i386::Output_data_plt_i386(Layout* layout,
|
Layout* layout,
|
Output_data_space* got_plt,
|
Output_data_space* got_plt)
|
Output_data_space* got_irelative)
|
: Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0),
|
: Output_section_data(16), layout_(layout), tls_desc_rel_(NULL),
|
global_ifuncs_(), local_ifuncs_()
|
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);
|
this->rel_ = new Reloc_section(false);
|
layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
|
layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
|
elfcpp::SHF_ALLOC, this->rel_,
|
elfcpp::SHF_ALLOC, this->rel_,
|
ORDER_DYNAMIC_PLT_RELOCS, false);
|
ORDER_DYNAMIC_PLT_RELOCS, false);
|
|
|
if (parameters->doing_static_link())
|
// Add unwind information if requested.
|
{
|
if (parameters->options().ld_generated_unwind_info())
|
// A statically linked executable will only have a .rel.plt
|
layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size,
|
// section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC
|
plt_eh_frame_fde, plt_eh_frame_fde_size);
|
// 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->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->rel_, 0, 0, elfcpp::STT_NOTYPE,
|
|
elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN,
|
|
0, true, true);
|
|
}
|
|
}
|
}
|
|
|
void
|
void
|
Output_data_plt_i386::do_adjust_output_section(Output_section* os)
|
Output_data_plt_i386::do_adjust_output_section(Output_section* os)
|
{
|
{
|
| Line 766... |
Line 849... |
}
|
}
|
|
|
// Add an entry to the PLT.
|
// Add an entry to the PLT.
|
|
|
void
|
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());
|
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);
|
|
|
|
++this->count_;
|
|
|
|
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 reloc.
|
// Every PLT entry needs a reloc.
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC
|
&& gsym->can_use_relative_reloc(false))
|
&& gsym->can_use_relative_reloc(false))
|
{
|
{
|
this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE,
|
gsym->set_plt_offset(this->irelative_count_ * plt_entry_size);
|
this->got_plt_, got_offset);
|
++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;
|
struct Global_ifunc gi;
|
gi.sym = gsym;
|
gi.sym = gsym;
|
gi.got_offset = got_offset;
|
gi.got_offset = got_offset;
|
this->global_ifuncs_.push_back(gi);
|
this->global_ifuncs_.push_back(gi);
|
}
|
}
|
else
|
else
|
{
|
{
|
|
// When setting the PLT offset we skip the initial reserved PLT
|
|
// entry.
|
|
gsym->set_plt_offset((this->count_ + 1) * plt_entry_size);
|
|
|
|
++this->count_;
|
|
|
|
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);
|
|
|
gsym->set_needs_dynsym_entry();
|
gsym->set_needs_dynsym_entry();
|
this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
|
this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
|
got_offset);
|
got_offset);
|
}
|
}
|
|
|
| Line 811... |
Line 901... |
// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
|
// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
|
// the PLT offset.
|
// the PLT offset.
|
|
|
unsigned int
|
unsigned int
|
Output_data_plt_i386::add_local_ifunc_entry(
|
Output_data_plt_i386::add_local_ifunc_entry(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
Sized_relobj_file<32, false>* relobj,
|
Sized_relobj_file<32, false>* relobj,
|
unsigned int local_sym_index)
|
unsigned int local_sym_index)
|
{
|
{
|
unsigned int plt_offset = (this->count_ + 1) * plt_entry_size;
|
unsigned int plt_offset = this->irelative_count_ * plt_entry_size;
|
++this->count_;
|
++this->irelative_count_;
|
|
|
section_offset_type got_offset = this->got_plt_->current_data_size();
|
section_offset_type got_offset = this->got_irelative_->current_data_size();
|
|
|
// Every PLT entry needs a GOT entry which points back to the PLT
|
// Every PLT entry needs a GOT entry which points back to the PLT
|
// entry.
|
// entry.
|
this->got_plt_->set_current_data_size(got_offset + 4);
|
this->got_irelative_->set_current_data_size(got_offset + 4);
|
|
|
// Every PLT entry needs a reloc.
|
// Every PLT entry needs a reloc.
|
this->rel_->add_symbolless_local_addend(relobj, local_sym_index,
|
Reloc_section* rel = this->rel_irelative(symtab, layout);
|
|
rel->add_symbolless_local_addend(relobj, local_sym_index,
|
elfcpp::R_386_IRELATIVE,
|
elfcpp::R_386_IRELATIVE,
|
this->got_plt_, got_offset);
|
this->got_irelative_, got_offset);
|
|
|
struct Local_ifunc li;
|
struct Local_ifunc li;
|
li.object = relobj;
|
li.object = relobj;
|
li.local_sym_index = local_sym_index;
|
li.local_sym_index = local_sym_index;
|
li.got_offset = got_offset;
|
li.got_offset = got_offset;
|
| Line 849... |
Line 942... |
{
|
{
|
this->tls_desc_rel_ = new Reloc_section(false);
|
this->tls_desc_rel_ = new Reloc_section(false);
|
layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
|
layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
|
elfcpp::SHF_ALLOC, this->tls_desc_rel_,
|
elfcpp::SHF_ALLOC, this->tls_desc_rel_,
|
ORDER_DYNAMIC_PLT_RELOCS, false);
|
ORDER_DYNAMIC_PLT_RELOCS, false);
|
gold_assert(this->tls_desc_rel_->output_section() ==
|
gold_assert(this->tls_desc_rel_->output_section()
|
this->rel_->output_section());
|
== this->rel_->output_section());
|
}
|
}
|
return this->tls_desc_rel_;
|
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) * plt_entry_size;
|
|
return this->address() + 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*, unsigned int)
|
|
{
|
|
return this->address() + (this->count_ + 1) * plt_entry_size;
|
|
}
|
|
|
// The first entry in the PLT for an executable.
|
// 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
|
0xff, 0x35, // pushl contents of memory address
|
0, 0, 0, 0, // replaced with address of .got + 4
|
0, 0, 0, 0, // replaced with address of .got + 4
|
0xff, 0x25, // jmp indirect
|
0xff, 0x25, // jmp indirect
|
0, 0, 0, 0, // replaced with address of .got + 8
|
0, 0, 0, 0, // replaced with address of .got + 8
|
0, 0, 0, 0 // unused
|
0, 0, 0, 0 // unused
|
};
|
};
|
|
|
// The first entry in the PLT for a shared object.
|
// 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, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
|
0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
|
0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
|
0, 0, 0, 0 // unused
|
0, 0, 0, 0 // unused
|
};
|
};
|
|
|
// Subsequent entries in the PLT for an executable.
|
// 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
|
0xff, 0x25, // jmp indirect
|
0, 0, 0, 0, // replaced with address of symbol in .got
|
0, 0, 0, 0, // replaced with address of symbol in .got
|
0x68, // pushl immediate
|
0x68, // pushl immediate
|
0, 0, 0, 0, // replaced with offset into relocation table
|
0, 0, 0, 0, // replaced with offset into relocation table
|
| Line 889... |
Line 1042... |
0, 0, 0, 0 // replaced with offset to start of .plt
|
0, 0, 0, 0 // replaced with offset to start of .plt
|
};
|
};
|
|
|
// Subsequent entries in the PLT for a shared object.
|
// 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)
|
0xff, 0xa3, // jmp *offset(%ebx)
|
0, 0, 0, 0, // replaced with offset of symbol in .got
|
0, 0, 0, 0, // replaced with offset of symbol in .got
|
0x68, // pushl immediate
|
0x68, // pushl immediate
|
0, 0, 0, 0, // replaced with offset into relocation table
|
0, 0, 0, 0, // replaced with offset into relocation table
|
0xe9, // jmp relative
|
0xe9, // jmp relative
|
0, 0, 0, 0 // replaced with offset to start of .plt
|
0, 0, 0, 0 // replaced with offset to start of .plt
|
};
|
};
|
|
|
|
// 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::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,
|
// Write out the PLT. This uses the hand-coded instructions above,
|
// and adjusts them as needed. This is all specified by the i386 ELF
|
// and adjusts them as needed. This is all specified by the i386 ELF
|
// Processor Supplement.
|
// Processor Supplement.
|
|
|
void
|
void
|
| Line 912... |
Line 1113... |
const section_size_type oview_size =
|
const section_size_type oview_size =
|
convert_to_section_size_type(this->data_size());
|
convert_to_section_size_type(this->data_size());
|
unsigned char* const oview = of->get_output_view(offset, oview_size);
|
unsigned char* const oview = of->get_output_view(offset, oview_size);
|
|
|
const off_t got_file_offset = this->got_plt_->offset();
|
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 =
|
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,
|
unsigned char* const got_view = of->get_output_view(got_file_offset,
|
got_size);
|
got_size);
|
|
|
unsigned char* pov = oview;
|
unsigned char* pov = oview;
|
|
|
| Line 934... |
Line 1139... |
}
|
}
|
pov += plt_entry_size;
|
pov += plt_entry_size;
|
|
|
unsigned char* got_pov = got_view;
|
unsigned char* got_pov = got_view;
|
|
|
memset(got_pov, 0, 12);
|
// The first entry in the GOT is the address of the .dynamic section
|
got_pov += 12;
|
// 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.
|
|
Output_section* dynamic = this->layout_->dynamic_section();
|
|
uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
|
|
elfcpp::Swap<32, false>::writeval(got_pov, dynamic_addr);
|
|
got_pov += 4;
|
|
memset(got_pov, 0, 8);
|
|
got_pov += 8;
|
|
|
const int rel_size = elfcpp::Elf_sizes<32>::rel_size;
|
const int rel_size = elfcpp::Elf_sizes<32>::rel_size;
|
|
|
unsigned int plt_offset = plt_entry_size;
|
unsigned int plt_offset = plt_entry_size;
|
unsigned int plt_rel_offset = 0;
|
unsigned int plt_rel_offset = 0;
|
unsigned int got_offset = 12;
|
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;
|
for (unsigned int i = 0;
|
i < count;
|
i < count;
|
++i,
|
++i,
|
pov += plt_entry_size,
|
pov += plt_entry_size,
|
got_pov += 4,
|
got_pov += 4,
|
| Line 979... |
Line 1192... |
|
|
// If any STT_GNU_IFUNC symbols have PLT entries, we need to change
|
// 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 GOT to point to the actual symbol value, rather than point to
|
// the PLT entry. That will let the dynamic linker call the right
|
// the PLT entry. That will let the dynamic linker call the right
|
// function when resolving IRELATIVE relocations.
|
// 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 =
|
for (std::vector<Global_ifunc>::const_iterator p =
|
this->global_ifuncs_.begin();
|
this->global_ifuncs_.begin();
|
p != this->global_ifuncs_.end();
|
p != this->global_ifuncs_.end();
|
++p)
|
++p)
|
{
|
{
|
const Sized_symbol<32>* ssym =
|
const Sized_symbol<32>* ssym =
|
static_cast<const Sized_symbol<32>*>(p->sym);
|
static_cast<const Sized_symbol<32>*>(p->sym);
|
elfcpp::Swap<32, false>::writeval(got_view + p->got_offset,
|
elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset,
|
ssym->value());
|
ssym->value());
|
}
|
}
|
|
|
for (std::vector<Local_ifunc>::const_iterator p =
|
for (std::vector<Local_ifunc>::const_iterator p =
|
this->local_ifuncs_.begin();
|
this->local_ifuncs_.begin();
|
p != this->local_ifuncs_.end();
|
p != this->local_ifuncs_.end();
|
++p)
|
++p)
|
{
|
{
|
const Symbol_value<32>* psymval =
|
const Symbol_value<32>* psymval =
|
p->object->local_symbol(p->local_sym_index);
|
p->object->local_symbol(p->local_sym_index);
|
elfcpp::Swap<32, false>::writeval(got_view + p->got_offset,
|
elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset,
|
psymval->value(p->object, 0));
|
psymval->value(p->object, 0));
|
}
|
}
|
|
|
gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
|
gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
|
gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
|
gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
|
| Line 1018... |
Line 1232... |
if (this->plt_ == NULL)
|
if (this->plt_ == NULL)
|
{
|
{
|
// Create the GOT sections first.
|
// Create the GOT sections first.
|
this->got_section(symtab, layout);
|
this->got_section(symtab, layout);
|
|
|
this->plt_ = new Output_data_plt_i386(symtab, layout, this->got_plt_);
|
this->plt_ = new Output_data_plt_i386(layout, this->got_plt_,
|
|
this->got_irelative_);
|
layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
|
layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
|
(elfcpp::SHF_ALLOC
|
(elfcpp::SHF_ALLOC
|
| elfcpp::SHF_EXECINSTR),
|
| elfcpp::SHF_EXECINSTR),
|
this->plt_, ORDER_PLT, false);
|
this->plt_, ORDER_PLT, false);
|
|
|
| Line 1039... |
Line 1254... |
{
|
{
|
if (gsym->has_plt_offset())
|
if (gsym->has_plt_offset())
|
return;
|
return;
|
if (this->plt_ == NULL)
|
if (this->plt_ == NULL)
|
this->make_plt_section(symtab, layout);
|
this->make_plt_section(symtab, layout);
|
this->plt_->add_entry(gsym);
|
this->plt_->add_entry(symtab, layout, gsym);
|
}
|
}
|
|
|
// Make a PLT entry for a local STT_GNU_IFUNC symbol.
|
// Make a PLT entry for a local STT_GNU_IFUNC symbol.
|
|
|
void
|
void
|
| Line 1053... |
Line 1268... |
{
|
{
|
if (relobj->local_has_plt_offset(local_sym_index))
|
if (relobj->local_has_plt_offset(local_sym_index))
|
return;
|
return;
|
if (this->plt_ == NULL)
|
if (this->plt_ == NULL)
|
this->make_plt_section(symtab, layout);
|
this->make_plt_section(symtab, layout);
|
unsigned int plt_offset = this->plt_->add_local_ifunc_entry(relobj,
|
unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
|
|
relobj,
|
local_sym_index);
|
local_sym_index);
|
relobj->set_local_plt_offset(local_sym_index, plt_offset);
|
relobj->set_local_plt_offset(local_sym_index, plt_offset);
|
}
|
}
|
|
|
// Return the number of entries in the PLT.
|
// Return the number of entries in the PLT.
|
| Line 1715... |
Line 1931... |
{
|
{
|
// Use an IRELATIVE reloc for a locally defined
|
// Use an IRELATIVE reloc for a locally defined
|
// STT_GNU_IFUNC symbol. This makes a function
|
// STT_GNU_IFUNC symbol. This makes a function
|
// address in a PIE executable match the address in a
|
// address in a PIE executable match the address in a
|
// shared library that it links against.
|
// shared library that it links against.
|
Reloc_section* rel_dyn = target->rel_dyn_section(layout);
|
Reloc_section* rel_dyn = target->rel_irelative_section(layout);
|
rel_dyn->add_symbolless_global_addend(gsym,
|
rel_dyn->add_symbolless_global_addend(gsym,
|
elfcpp::R_386_IRELATIVE,
|
elfcpp::R_386_IRELATIVE,
|
output_section,
|
output_section,
|
object, data_shndx,
|
object, data_shndx,
|
reloc.get_r_offset());
|
reloc.get_r_offset());
|
| Line 1792... |
Line 2008... |
else
|
else
|
{
|
{
|
// If this symbol is not fully resolved, we need to add a
|
// If this symbol is not fully resolved, we need to add a
|
// GOT entry with a dynamic relocation.
|
// GOT entry with a dynamic relocation.
|
Reloc_section* rel_dyn = target->rel_dyn_section(layout);
|
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()
|
if (gsym->is_from_dynobj()
|
|| gsym->is_undefined()
|
|| gsym->is_undefined()
|
|| gsym->is_preemptible()
|
|| gsym->is_preemptible()
|
|
|| (gsym->visibility() == elfcpp::STV_PROTECTED
|
|
&& parameters->options().shared())
|
|| (gsym->type() == elfcpp::STT_GNU_IFUNC
|
|| (gsym->type() == elfcpp::STT_GNU_IFUNC
|
&& parameters->options().output_is_position_independent()))
|
&& parameters->options().output_is_position_independent()))
|
got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
|
got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
|
rel_dyn, elfcpp::R_386_GLOB_DAT);
|
rel_dyn, elfcpp::R_386_GLOB_DAT);
|
else
|
else
|
| Line 2117... |
Line 2348... |
if (sym != NULL)
|
if (sym != NULL)
|
{
|
{
|
uint32_t data_size = this->got_plt_->current_data_size();
|
uint32_t data_size = this->got_plt_->current_data_size();
|
symtab->get_sized_symbol<32>(sym)->set_symsize(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.
|
// Return whether a direct absolute static relocation needs to be applied.
|
// In cases where Scan::local() or Scan::global() has created
|
// In cases where Scan::local() or Scan::global() has created
|
// a dynamic relocation other than R_386_RELATIVE, the addend
|
// a dynamic relocation other than R_386_RELATIVE, the addend
|
| Line 2208... |
Line 2480... |
// want to use the real value of the symbol, not the PLT offset.
|
// want to use the real value of the symbol, not the PLT offset.
|
}
|
}
|
else if (gsym != NULL
|
else if (gsym != NULL
|
&& gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
|
&& gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
|
{
|
{
|
symval.set_output_value(target->plt_section()->address()
|
symval.set_output_value(target->plt_address_for_global(gsym)
|
+ gsym->plt_offset());
|
+ gsym->plt_offset());
|
psymval = &symval;
|
psymval = &symval;
|
}
|
}
|
else if (gsym == NULL && psymval->is_ifunc_symbol())
|
else if (gsym == NULL && psymval->is_ifunc_symbol())
|
{
|
{
|
unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
|
unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
|
if (object->local_has_plt_offset(r_sym))
|
if (object->local_has_plt_offset(r_sym))
|
{
|
{
|
symval.set_output_value(target->plt_section()->address()
|
symval.set_output_value(target->plt_address_for_local(object, r_sym)
|
+ object->local_plt_offset(r_sym));
|
+ object->local_plt_offset(r_sym));
|
psymval = &symval;
|
psymval = &symval;
|
}
|
}
|
}
|
}
|
|
|
| Line 2404... |
Line 2676... |
switch (r_type)
|
switch (r_type)
|
{
|
{
|
case elfcpp::R_386_TLS_GD: // Global-dynamic
|
case elfcpp::R_386_TLS_GD: // Global-dynamic
|
if (optimized_type == tls::TLSOPT_TO_LE)
|
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,
|
this->tls_gd_to_le(relinfo, relnum, tls_segment,
|
rel, r_type, value, view,
|
rel, r_type, value, view,
|
view_size);
|
view_size);
|
break;
|
break;
|
}
|
}
|
| Line 2430... |
Line 2707... |
got_offset = (object->local_got_offset(r_sym, got_type)
|
got_offset = (object->local_got_offset(r_sym, got_type)
|
- target->got_size());
|
- target->got_size());
|
}
|
}
|
if (optimized_type == tls::TLSOPT_TO_IE)
|
if (optimized_type == tls::TLSOPT_TO_IE)
|
{
|
{
|
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_ie(relinfo, relnum, tls_segment, rel, r_type,
|
this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
|
got_offset, view, view_size);
|
got_offset, view, view_size);
|
break;
|
break;
|
}
|
}
|
else if (optimized_type == tls::TLSOPT_NONE)
|
else if (optimized_type == tls::TLSOPT_NONE)
|
| Line 2453... |
Line 2735... |
case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
|
case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
|
case elfcpp::R_386_TLS_DESC_CALL:
|
case elfcpp::R_386_TLS_DESC_CALL:
|
this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
|
this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
|
if (optimized_type == tls::TLSOPT_TO_LE)
|
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,
|
this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
|
rel, r_type, value, view,
|
rel, r_type, value, view,
|
view_size);
|
view_size);
|
break;
|
break;
|
}
|
}
|
| Line 2488... |
Line 2775... |
got_offset += (object->local_got_offset(r_sym, got_type)
|
got_offset += (object->local_got_offset(r_sym, got_type)
|
- target->got_size());
|
- target->got_size());
|
}
|
}
|
if (optimized_type == tls::TLSOPT_TO_IE)
|
if (optimized_type == tls::TLSOPT_TO_IE)
|
{
|
{
|
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_ie(relinfo, relnum, tls_segment, rel, r_type,
|
this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
|
got_offset, view, view_size);
|
got_offset, view, view_size);
|
break;
|
break;
|
}
|
}
|
else if (optimized_type == tls::TLSOPT_NONE)
|
else if (optimized_type == tls::TLSOPT_NONE)
|
| Line 2520... |
Line 2812... |
break;
|
break;
|
}
|
}
|
this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
|
this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
|
if (optimized_type == tls::TLSOPT_TO_LE)
|
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,
|
this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type,
|
value, view, view_size);
|
value, view, view_size);
|
break;
|
break;
|
}
|
}
|
else if (optimized_type == tls::TLSOPT_NONE)
|
else if (optimized_type == tls::TLSOPT_NONE)
|
| Line 2551... |
Line 2848... |
// containing executable code. That is what the GNU linker
|
// containing executable code. That is what the GNU linker
|
// does as well.
|
// does as well.
|
elfcpp::Shdr<32, false> shdr(relinfo->data_shdr);
|
elfcpp::Shdr<32, false> shdr(relinfo->data_shdr);
|
if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0)
|
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();
|
value -= tls_segment->memsz();
|
}
|
}
|
}
|
}
|
Relocate_functions<32, false>::rel32(view, value);
|
Relocate_functions<32, false>::rel32(view, value);
|
break;
|
break;
|
| Line 2563... |
Line 2865... |
case elfcpp::R_386_TLS_IE: // Initial-exec
|
case elfcpp::R_386_TLS_IE: // Initial-exec
|
case elfcpp::R_386_TLS_GOTIE:
|
case elfcpp::R_386_TLS_GOTIE:
|
case elfcpp::R_386_TLS_IE_32:
|
case elfcpp::R_386_TLS_IE_32:
|
if (optimized_type == tls::TLSOPT_TO_LE)
|
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,
|
Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
|
rel, r_type, value, view,
|
rel, r_type, value, view,
|
view_size);
|
view_size);
|
break;
|
break;
|
}
|
}
|
| Line 2607... |
Line 2914... |
case elfcpp::R_386_TLS_LE: // Local-exec
|
case elfcpp::R_386_TLS_LE: // Local-exec
|
// If we're creating a shared library, a dynamic relocation will
|
// If we're creating a shared library, a dynamic relocation will
|
// have been created for this location, so do not apply it now.
|
// have been created for this location, so do not apply it now.
|
if (!parameters->options().shared())
|
if (!parameters->options().shared())
|
{
|
{
|
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();
|
value -= tls_segment->memsz();
|
Relocate_functions<32, false>::rel32(view, value);
|
Relocate_functions<32, false>::rel32(view, value);
|
}
|
}
|
break;
|
break;
|
|
|
case elfcpp::R_386_TLS_LE_32:
|
case elfcpp::R_386_TLS_LE_32:
|
// If we're creating a shared library, a dynamic relocation will
|
// If we're creating a shared library, a dynamic relocation will
|
// have been created for this location, so do not apply it now.
|
// have been created for this location, so do not apply it now.
|
if (!parameters->options().shared())
|
if (!parameters->options().shared())
|
{
|
{
|
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() - value;
|
value = tls_segment->memsz() - value;
|
Relocate_functions<32, false>::rel32(view, value);
|
Relocate_functions<32, false>::rel32(view, value);
|
}
|
}
|
break;
|
break;
|
}
|
}
|
| Line 3141... |
Line 3458... |
|
|
uint64_t
|
uint64_t
|
Target_i386::do_dynsym_value(const Symbol* gsym) const
|
Target_i386::do_dynsym_value(const Symbol* gsym) const
|
{
|
{
|
gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
|
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) + gsym->plt_offset();
|
}
|
}
|
|
|
// Return a string used to fill a code section with nops to take up
|
// Return a string used to fill a code section with nops to take up
|
// the specified length.
|
// the specified length.
|
|
|
| Line 3207... |
Line 3524... |
};
|
};
|
|
|
return std::string(nops[length], length);
|
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
|
// 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
|
// function. We don't want that to be true of a call to a
|
// get_pc_thunk function.
|
// get_pc_thunk function.
|
|
|
bool
|
bool
|
| Line 3284... |
Line 3616... |
class Target_selector_i386 : public Target_selector_freebsd
|
class Target_selector_i386 : public Target_selector_freebsd
|
{
|
{
|
public:
|
public:
|
Target_selector_i386()
|
Target_selector_i386()
|
: Target_selector_freebsd(elfcpp::EM_386, 32, false,
|
: Target_selector_freebsd(elfcpp::EM_386, 32, false,
|
"elf32-i386", "elf32-i386-freebsd")
|
"elf32-i386", "elf32-i386-freebsd",
|
|
"elf_i386")
|
{ }
|
{ }
|
|
|
Target*
|
Target*
|
do_instantiate_target()
|
do_instantiate_target()
|
{ return new Target_i386(); }
|
{ return new Target_i386(); }
|
