| Line 1... |
Line 1... |
// x86_64.cc -- x86_64 target support for gold.
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// x86_64.cc -- x86_64 target support for gold.
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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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|
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// This file is part of gold.
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// This file is part of gold.
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|
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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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|
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#include <cstring>
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#include <cstring>
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|
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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 "x86_64.h"
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#include "x86_64.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 51... |
Line 52... |
class Output_data_plt_x86_64 : public Output_section_data
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class Output_data_plt_x86_64 : 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_RELA, true, 64, false> Reloc_section;
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typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section;
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|
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Output_data_plt_x86_64(Symbol_table* symtab, Layout* layout,
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Output_data_plt_x86_64(Layout* layout, Output_data_got<64, false>* got,
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Output_data_got<64, false>* got,
|
Output_data_space* got_plt,
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Output_data_space* got_plt)
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Output_data_space* got_irelative)
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: Output_section_data(8), tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt),
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: Output_section_data(16), layout_(layout), tlsdesc_rel_(NULL),
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count_(0), tlsdesc_got_offset_(-1U), free_list_()
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irelative_rel_(NULL), got_(got), got_plt_(got_plt),
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{ this->init(symtab, layout); }
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got_irelative_(got_irelative), count_(0), irelative_count_(0),
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tlsdesc_got_offset_(-1U), free_list_()
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{ this->init(layout); }
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|
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Output_data_plt_x86_64(Symbol_table* symtab, Layout* layout,
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Output_data_plt_x86_64(Layout* layout, Output_data_got<64, false>* got,
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Output_data_got<64, false>* got,
|
|
Output_data_space* got_plt,
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Output_data_space* got_plt,
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Output_data_space* got_irelative,
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unsigned int plt_count)
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unsigned int plt_count)
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: Output_section_data((plt_count + 1) * plt_entry_size, 8, false),
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: Output_section_data((plt_count + 1) * plt_entry_size, 16, false),
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tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt),
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layout_(layout), tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
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count_(plt_count), tlsdesc_got_offset_(-1U), free_list_()
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got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
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irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_()
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{
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{
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this->init(symtab, layout);
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this->init(layout);
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// Initialize the free list and reserve the first entry.
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// Initialize the free list and reserve the first entry.
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this->free_list_.init((plt_count + 1) * plt_entry_size, false);
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this->free_list_.init((plt_count + 1) * plt_entry_size, false);
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this->free_list_.remove(0, plt_entry_size);
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this->free_list_.remove(0, plt_entry_size);
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}
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}
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// Initialize the PLT section.
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// Initialize the PLT section.
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void
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void
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init(Symbol_table* symtab, Layout* layout);
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init(Layout* layout);
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|
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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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|
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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<64, false>* relobj,
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add_local_ifunc_entry(Symbol_table* symtab, Layout*,
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Sized_relobj_file<64, false>* relobj,
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unsigned int local_sym_index);
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unsigned int local_sym_index);
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|
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// Add the relocation for a PLT entry.
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// Add the relocation for a PLT entry.
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void
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void
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add_relocation(Symbol* gsym, unsigned int got_offset);
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add_relocation(Symbol_table*, Layout*, Symbol* gsym,
|
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unsigned int got_offset);
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|
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// Add the reserved TLSDESC_PLT entry to the PLT.
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// Add the reserved TLSDESC_PLT entry to the PLT.
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void
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void
|
reserve_tlsdesc_entry(unsigned int got_offset)
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reserve_tlsdesc_entry(unsigned int got_offset)
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{ this->tlsdesc_got_offset_ = got_offset; }
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{ this->tlsdesc_got_offset_ = got_offset; }
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| Line 108... |
Line 114... |
{ return this->tlsdesc_got_offset_; }
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{ return this->tlsdesc_got_offset_; }
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|
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// Return the offset of the reserved TLSDESC_PLT entry.
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// Return the offset of the reserved TLSDESC_PLT entry.
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unsigned int
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unsigned int
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get_tlsdesc_plt_offset() const
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get_tlsdesc_plt_offset() const
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{ return (this->count_ + 1) * plt_entry_size; }
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{ return (this->count_ + this->irelative_count_ + 1) * plt_entry_size; }
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// Return the .rela.plt section data.
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// Return the .rela.plt section data.
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Reloc_section*
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Reloc_section*
|
rela_plt()
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rela_plt()
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{ return this->rel_; }
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{ return this->rel_; }
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// Return where the TLSDESC relocations should go.
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// Return where the TLSDESC relocations should go.
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Reloc_section*
|
Reloc_section*
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rela_tlsdesc(Layout*);
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rela_tlsdesc(Layout*);
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// Return where the IRELATIVE relocations should go in the PLT
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// relocations.
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Reloc_section*
|
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rela_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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|
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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
|
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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|
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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
|
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 142... |
Line 158... |
{
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{
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this->free_list_.remove((plt_index + 1) * plt_entry_size,
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this->free_list_.remove((plt_index + 1) * plt_entry_size,
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(plt_index + 2) * plt_entry_size);
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(plt_index + 2) * plt_entry_size);
|
}
|
}
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|
|
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// Return the PLT address to use for a global symbol.
|
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uint64_t
|
|
address_for_global(const Symbol*);
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|
|
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// Return the PLT address to use for a local symbol.
|
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uint64_t
|
|
address_for_local(const Relobj*, unsigned int symndx);
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|
|
protected:
|
protected:
|
void
|
void
|
do_adjust_output_section(Output_section* os);
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do_adjust_output_section(Output_section* os);
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|
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// Write to a map file.
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// Write to a map file.
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| Line 158... |
Line 182... |
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.
|
// The first entry in the PLT.
|
// From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
|
// From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
|
// procedure linkage table for both programs and shared objects."
|
// procedure linkage table for both programs and shared objects."
|
static unsigned char first_plt_entry[plt_entry_size];
|
static const unsigned char first_plt_entry[plt_entry_size];
|
|
|
// Other entries in the PLT for an executable.
|
// Other entries in the PLT for an executable.
|
static unsigned char plt_entry[plt_entry_size];
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static const unsigned char plt_entry[plt_entry_size];
|
|
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// The reserved TLSDESC entry in the PLT for an executable.
|
// The reserved TLSDESC entry in the PLT for an executable.
|
static unsigned char tlsdesc_plt_entry[plt_entry_size];
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static const unsigned char tlsdesc_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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|
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// Set the final size.
|
// Set the final size.
|
void
|
void
|
set_final_data_size();
|
set_final_data_size();
|
|
|
// Write out the PLT data.
|
// Write out the PLT data.
|
void
|
void
|
do_write(Output_file*);
|
do_write(Output_file*);
|
|
|
|
// A pointer to the Layout class, so that we can find the .dynamic
|
|
// section when we write out the GOT PLT section.
|
|
Layout* layout_;
|
// The reloc section.
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// The reloc section.
|
Reloc_section* rel_;
|
Reloc_section* rel_;
|
// The TLSDESC relocs, if necessary. These must follow the regular
|
// The TLSDESC relocs, if necessary. These must follow the regular
|
// PLT relocs.
|
// PLT relocs.
|
Reloc_section* tlsdesc_rel_;
|
Reloc_section* tlsdesc_rel_;
|
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// The IRELATIVE relocs, if necessary. These must follow the
|
|
// regular PLT relocations and the TLSDESC relocations.
|
|
Reloc_section* irelative_rel_;
|
// The .got section.
|
// The .got section.
|
Output_data_got<64, false>* got_;
|
Output_data_got<64, false>* got_;
|
// The .got.plt section.
|
// The .got.plt section.
|
Output_data_space* got_plt_;
|
Output_data_space* got_plt_;
|
|
// The part of the .got.plt section used for IRELATIVE relocs.
|
|
Output_data_space* got_irelative_;
|
// The number of PLT entries.
|
// The number of PLT entries.
|
unsigned int count_;
|
unsigned int count_;
|
|
// Number of PLT entries with R_X86_64_IRELATIVE relocs. These
|
|
// follow the regular PLT entries.
|
|
unsigned int irelative_count_;
|
// Offset of the reserved TLSDESC_GOT entry when needed.
|
// Offset of the reserved TLSDESC_GOT entry when needed.
|
unsigned int tlsdesc_got_offset_;
|
unsigned int tlsdesc_got_offset_;
|
// List of available regions within the section, for incremental
|
// List of available regions within the section, for incremental
|
// update links.
|
// update links.
|
Free_list free_list_;
|
Free_list free_list_;
|
| Line 199... |
Line 240... |
// http://www.x86-64.org/documentation/abi.pdf
|
// http://www.x86-64.org/documentation/abi.pdf
|
// TLS info comes from
|
// TLS info comes from
|
// http://people.redhat.com/drepper/tls.pdf
|
// http://people.redhat.com/drepper/tls.pdf
|
// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
|
// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
|
|
|
class Target_x86_64 : public Target_freebsd<64, false>
|
class Target_x86_64 : public Sized_target<64, false>
|
{
|
{
|
public:
|
public:
|
// In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
|
// In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
|
// uses only Elf64_Rela relocation entries with explicit addends."
|
// uses only Elf64_Rela relocation entries with explicit addends."
|
typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section;
|
typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section;
|
|
|
Target_x86_64()
|
Target_x86_64()
|
: Target_freebsd<64, false>(&x86_64_info),
|
: Sized_target<64, false>(&x86_64_info),
|
got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL),
|
got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
|
global_offset_table_(NULL), rela_dyn_(NULL),
|
got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
|
copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL),
|
rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
|
got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
|
dynbss_(NULL), got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
|
tls_base_symbol_defined_(false)
|
tls_base_symbol_defined_(false)
|
{ }
|
{ }
|
|
|
// This function should be defined in targets that can use relocation
|
|
// types to determine (implemented in local_reloc_may_be_function_pointer
|
|
// and global_reloc_may_be_function_pointer)
|
|
// if a function's pointer is taken. ICF uses this in safe mode to only
|
|
// fold those functions whose pointer is defintely not taken. For x86_64
|
|
// pie binaries, safe ICF cannot be done by looking at relocation types.
|
|
inline bool
|
|
can_check_for_function_pointers() const
|
|
{ return !parameters->options().pie(); }
|
|
|
|
virtual bool
|
|
can_icf_inline_merge_sections () const
|
|
{ return true; }
|
|
|
|
// Hook for a new output section.
|
// Hook for a new output section.
|
void
|
void
|
do_new_output_section(Output_section*) const;
|
do_new_output_section(Output_section*) const;
|
|
|
// Scan the relocations to look for symbol adjustments.
|
// Scan the relocations to look for symbol adjustments.
|
| Line 337... |
Line 364... |
// Return the addend to use for a target specific relocation.
|
// Return the addend to use for a target specific relocation.
|
uint64_t
|
uint64_t
|
do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
|
do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
|
|
|
// Return the PLT section.
|
// Return the PLT section.
|
Output_data*
|
uint64_t
|
do_plt_section_for_global(const Symbol*) const
|
do_plt_address_for_global(const Symbol* gsym) const
|
{ return this->plt_section(); }
|
{ return this->plt_section()->address_for_global(gsym); }
|
|
|
Output_data*
|
uint64_t
|
do_plt_section_for_local(const Relobj*, unsigned int) const
|
do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
|
{ return this->plt_section(); }
|
{ return this->plt_section()->address_for_local(relobj, symndx); }
|
|
|
|
// This function should be defined in targets that can use relocation
|
|
// types to determine (implemented in local_reloc_may_be_function_pointer
|
|
// and global_reloc_may_be_function_pointer)
|
|
// if a function's pointer is taken. ICF uses this in safe mode to only
|
|
// fold those functions whose pointer is defintely not taken. For x86_64
|
|
// pie binaries, safe ICF cannot be done by looking at relocation types.
|
|
bool
|
|
do_can_check_for_function_pointers() const
|
|
{ return !parameters->options().pie(); }
|
|
|
|
// Return the base for a DW_EH_PE_datarel encoding.
|
|
uint64_t
|
|
do_ehframe_datarel_base() const;
|
|
|
// Adjust -fsplit-stack code which calls non-split-stack code.
|
// Adjust -fsplit-stack code which calls non-split-stack code.
|
void
|
void
|
do_calls_non_split(Relobj* object, unsigned int shndx,
|
do_calls_non_split(Relobj* object, unsigned int shndx,
|
section_offset_type fnoffset, section_size_type fnsize,
|
section_offset_type fnoffset, section_size_type fnsize,
|
| Line 404... |
Line 445... |
reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
|
reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
|
unsigned int got_type);
|
unsigned int got_type);
|
|
|
// Register an existing PLT entry for a global symbol.
|
// Register an existing PLT entry for a global symbol.
|
void
|
void
|
register_global_plt_entry(unsigned int plt_index, Symbol* gsym);
|
register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
|
|
Symbol* gsym);
|
|
|
// Force a COPY relocation for a given symbol.
|
// Force a COPY relocation for a given symbol.
|
void
|
void
|
emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
|
emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
|
|
|
| Line 486... |
Line 528... |
static void
|
static void
|
unsupported_reloc_global(Sized_relobj_file<64, false>*, unsigned int r_type,
|
unsupported_reloc_global(Sized_relobj_file<64, false>*, unsigned int r_type,
|
Symbol*);
|
Symbol*);
|
|
|
void
|
void
|
check_non_pic(Relobj*, unsigned int r_type);
|
check_non_pic(Relobj*, unsigned int r_type, Symbol*);
|
|
|
inline bool
|
inline bool
|
possible_function_pointer_reloc(unsigned int r_type);
|
possible_function_pointer_reloc(unsigned int r_type);
|
|
|
bool
|
bool
|
| Line 674... |
Line 716... |
|
|
// Get the section to use for TLSDESC relocations.
|
// Get the section to use for TLSDESC relocations.
|
Reloc_section*
|
Reloc_section*
|
rela_tlsdesc_section(Layout*) const;
|
rela_tlsdesc_section(Layout*) const;
|
|
|
|
// Get the section to use for IRELATIVE relocations.
|
|
Reloc_section*
|
|
rela_irelative_section(Layout*);
|
|
|
// Add a potential copy relocation.
|
// Add a potential copy relocation.
|
void
|
void
|
copy_reloc(Symbol_table* symtab, Layout* layout,
|
copy_reloc(Symbol_table* symtab, Layout* layout,
|
Sized_relobj_file<64, false>* object,
|
Sized_relobj_file<64, false>* object,
|
unsigned int shndx, Output_section* output_section,
|
unsigned int shndx, Output_section* output_section,
|
| Line 724... |
Line 770... |
Output_data_got<64, false>* got_;
|
Output_data_got<64, false>* got_;
|
// The PLT section.
|
// The PLT section.
|
Output_data_plt_x86_64* plt_;
|
Output_data_plt_x86_64* plt_;
|
// The GOT PLT section.
|
// The GOT PLT section.
|
Output_data_space* got_plt_;
|
Output_data_space* got_plt_;
|
|
// The GOT section for IRELATIVE relocations.
|
|
Output_data_space* got_irelative_;
|
// The GOT section for TLSDESC relocations.
|
// The GOT section for TLSDESC relocations.
|
Output_data_got<64, false>* got_tlsdesc_;
|
Output_data_got<64, false>* got_tlsdesc_;
|
// The _GLOBAL_OFFSET_TABLE_ symbol.
|
// The _GLOBAL_OFFSET_TABLE_ symbol.
|
Symbol* global_offset_table_;
|
Symbol* global_offset_table_;
|
// The dynamic reloc section.
|
// The dynamic reloc section.
|
Reloc_section* rela_dyn_;
|
Reloc_section* rela_dyn_;
|
|
// The section to use for IRELATIVE relocs.
|
|
Reloc_section* rela_irelative_;
|
// Relocs saved to avoid a COPY reloc.
|
// Relocs saved to avoid a COPY reloc.
|
Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_;
|
Copy_relocs<elfcpp::SHT_RELA, 64, 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.
|
| Line 753... |
Line 803... |
elfcpp::EM_X86_64, // machine_code
|
elfcpp::EM_X86_64, // machine_code
|
false, // has_make_symbol
|
false, // has_make_symbol
|
false, // has_resolve
|
false, // has_resolve
|
true, // has_code_fill
|
true, // has_code_fill
|
true, // is_default_stack_executable
|
true, // is_default_stack_executable
|
|
true, // can_icf_inline_merge_sections
|
'\0', // wrap_char
|
'\0', // wrap_char
|
"/lib/ld64.so.1", // program interpreter
|
"/lib/ld64.so.1", // program interpreter
|
0x400000, // default_text_segment_address
|
0x400000, // default_text_segment_address
|
0x1000, // abi_pagesize (overridable by -z max-page-size)
|
0x1000, // abi_pagesize (overridable by -z max-page-size)
|
0x1000, // common_pagesize (overridable by -z common-page-size)
|
0x1000, // common_pagesize (overridable by -z common-page-size)
|
| Line 785... |
Line 836... |
{
|
{
|
if (this->got_ == NULL)
|
if (this->got_ == NULL)
|
{
|
{
|
gold_assert(symtab != NULL && layout != NULL);
|
gold_assert(symtab != NULL && layout != NULL);
|
|
|
|
// When using -z now, we can treat .got.plt as a relro section.
|
|
// Without -z now, it is modified after program startup by lazy
|
|
// PLT relocations.
|
|
bool is_got_plt_relro = parameters->options().now();
|
|
Output_section_order got_order = (is_got_plt_relro
|
|
? ORDER_RELRO
|
|
: ORDER_RELRO_LAST);
|
|
Output_section_order got_plt_order = (is_got_plt_relro
|
|
? ORDER_RELRO
|
|
: ORDER_NON_RELRO_FIRST);
|
|
|
this->got_ = new Output_data_got<64, false>();
|
this->got_ = new Output_data_got<64, false>();
|
|
|
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,
|
this->got_, got_order, true);
|
true);
|
|
|
|
this->got_plt_ = new Output_data_space(8, "** GOT PLT");
|
this->got_plt_ = new Output_data_space(8, "** 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 * 8);
|
this->got_plt_->set_current_data_size(3 * 8);
|
|
|
|
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 * 8);
|
layout->increase_relro(3 * 8);
|
|
}
|
|
|
// 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 816... |
Line 880... |
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 entries.
|
|
this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT");
|
|
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
|
|
(elfcpp::SHF_ALLOC
|
|
| elfcpp::SHF_WRITE),
|
|
this->got_irelative_,
|
|
got_plt_order, is_got_plt_relro);
|
|
|
// If there are any TLSDESC relocations, they get GOT entries in
|
// If there are any TLSDESC relocations, they get GOT entries in
|
// .got.plt after the jump slot entries.
|
// .got.plt after the jump slot and IRELATIVE entries.
|
this->got_tlsdesc_ = new Output_data_got<64, false>();
|
this->got_tlsdesc_ = new Output_data_got<64, 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 845... |
Line 918... |
ORDER_DYNAMIC_RELOCS, false);
|
ORDER_DYNAMIC_RELOCS, false);
|
}
|
}
|
return this->rela_dyn_;
|
return this->rela_dyn_;
|
}
|
}
|
|
|
|
// Get the section to use for IRELATIVE relocs, creating it if
|
|
// necessary. These go in .rela.dyn, but only after all other dynamic
|
|
// relocations. They need to follow the other dynamic relocations so
|
|
// that they can refer to global variables initialized by those
|
|
// relocs.
|
|
|
|
Target_x86_64::Reloc_section*
|
|
Target_x86_64::rela_irelative_section(Layout* layout)
|
|
{
|
|
if (this->rela_irelative_ == NULL)
|
|
{
|
|
// Make sure we have already created the dynamic reloc section.
|
|
this->rela_dyn_section(layout);
|
|
this->rela_irelative_ = new Reloc_section(false);
|
|
layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
|
|
elfcpp::SHF_ALLOC, this->rela_irelative_,
|
|
ORDER_DYNAMIC_RELOCS, false);
|
|
gold_assert(this->rela_dyn_->output_section()
|
|
== this->rela_irelative_->output_section());
|
|
}
|
|
return this->rela_irelative_;
|
|
}
|
|
|
// Initialize the PLT section.
|
// Initialize the PLT section.
|
|
|
void
|
void
|
Output_data_plt_x86_64::init(Symbol_table* symtab, Layout* layout)
|
Output_data_plt_x86_64::init(Layout* layout)
|
{
|
{
|
this->rel_ = new Reloc_section(false);
|
this->rel_ = new Reloc_section(false);
|
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
|
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
|
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 .rela.plt
|
layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size,
|
// section to hold R_X86_64_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("__rela_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("__rela_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_x86_64::do_adjust_output_section(Output_section* os)
|
Output_data_plt_x86_64::do_adjust_output_section(Output_section* os)
|
{
|
{
|
| Line 883... |
Line 966... |
}
|
}
|
|
|
// Add an entry to the PLT.
|
// Add an entry to the PLT.
|
|
|
void
|
void
|
Output_data_plt_x86_64::add_entry(Symbol* gsym)
|
Output_data_plt_x86_64::add_entry(Symbol_table* symtab, Layout* layout,
|
|
Symbol* gsym)
|
{
|
{
|
gold_assert(!gsym->has_plt_offset());
|
gold_assert(!gsym->has_plt_offset());
|
|
|
unsigned int plt_index;
|
unsigned int plt_index;
|
off_t plt_offset;
|
off_t plt_offset;
|
section_offset_type got_offset;
|
section_offset_type got_offset;
|
|
|
|
unsigned int* pcount;
|
|
unsigned int offset;
|
|
unsigned int reserved;
|
|
Output_data_space* got;
|
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC
|
|
&& gsym->can_use_relative_reloc(false))
|
|
{
|
|
pcount = &this->irelative_count_;
|
|
offset = 0;
|
|
reserved = 0;
|
|
got = this->got_irelative_;
|
|
}
|
|
else
|
|
{
|
|
pcount = &this->count_;
|
|
offset = 1;
|
|
reserved = 3;
|
|
got = this->got_plt_;
|
|
}
|
|
|
if (!this->is_data_size_valid())
|
if (!this->is_data_size_valid())
|
{
|
{
|
// Note that when setting the PLT offset we skip the initial
|
// Note that when setting the PLT offset for a non-IRELATIVE
|
// reserved PLT entry.
|
// entry we skip the initial reserved PLT entry.
|
plt_index = this->count_ + 1;
|
plt_index = *pcount + offset;
|
plt_offset = plt_index * plt_entry_size;
|
plt_offset = plt_index * plt_entry_size;
|
|
|
++this->count_;
|
++*pcount;
|
|
|
got_offset = (plt_index - 1 + 3) * 8;
|
got_offset = (plt_index - offset + reserved) * 8;
|
gold_assert(got_offset == this->got_plt_->current_data_size());
|
gold_assert(got_offset == got->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 (this will be changed by the dynamic linker, normally
|
// entry (this will be changed by the dynamic linker, normally
|
// lazily when the function is called).
|
// lazily when the function is called).
|
this->got_plt_->set_current_data_size(got_offset + 8);
|
got->set_current_data_size(got_offset + 8);
|
}
|
}
|
else
|
else
|
{
|
{
|
|
// FIXME: This is probably not correct for IRELATIVE relocs.
|
|
|
// For incremental updates, find an available slot.
|
// For incremental updates, find an available slot.
|
plt_offset = this->free_list_.allocate(plt_entry_size, plt_entry_size, 0);
|
plt_offset = this->free_list_.allocate(plt_entry_size, plt_entry_size, 0);
|
if (plt_offset == -1)
|
if (plt_offset == -1)
|
gold_fallback(_("out of patch space (PLT);"
|
gold_fallback(_("out of patch space (PLT);"
|
" relink with --incremental-full"));
|
" relink with --incremental-full"));
|
|
|
// The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
|
// The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
|
// can be calculated from the PLT index, adjusting for the three
|
// can be calculated from the PLT index, adjusting for the three
|
// reserved entries at the beginning of the GOT.
|
// reserved entries at the beginning of the GOT.
|
plt_index = plt_offset / plt_entry_size - 1;
|
plt_index = plt_offset / plt_entry_size - 1;
|
got_offset = (plt_index - 1 + 3) * 8;
|
got_offset = (plt_index - offset + reserved) * 8;
|
}
|
}
|
|
|
gsym->set_plt_offset(plt_offset);
|
gsym->set_plt_offset(plt_offset);
|
|
|
// Every PLT entry needs a reloc.
|
// Every PLT entry needs a reloc.
|
this->add_relocation(gsym, got_offset);
|
this->add_relocation(symtab, layout, gsym, got_offset);
|
|
|
// Note that we don't need to save the symbol. The contents of the
|
// 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
|
// PLT are independent of which symbols are used. The symbols only
|
// appear in the relocations.
|
// appear in the relocations.
|
}
|
}
|
| Line 938... |
Line 1044... |
// 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_x86_64::add_local_ifunc_entry(
|
Output_data_plt_x86_64::add_local_ifunc_entry(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
Sized_relobj_file<64, false>* relobj,
|
Sized_relobj_file<64, 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 + 8);
|
this->got_irelative_->set_current_data_size(got_offset + 8);
|
|
|
// Every PLT entry needs a reloc.
|
// Every PLT entry needs a reloc.
|
this->rel_->add_symbolless_local_addend(relobj, local_sym_index,
|
Reloc_section* rela = this->rela_irelative(symtab, layout);
|
|
rela->add_symbolless_local_addend(relobj, local_sym_index,
|
elfcpp::R_X86_64_IRELATIVE,
|
elfcpp::R_X86_64_IRELATIVE,
|
this->got_plt_, got_offset, 0);
|
this->got_irelative_, got_offset, 0);
|
|
|
return plt_offset;
|
return plt_offset;
|
}
|
}
|
|
|
// Add the relocation for a PLT entry.
|
// Add the relocation for a PLT entry.
|
|
|
void
|
void
|
Output_data_plt_x86_64::add_relocation(Symbol* gsym, unsigned int got_offset)
|
Output_data_plt_x86_64::add_relocation(Symbol_table* symtab, Layout* layout,
|
|
Symbol* gsym, unsigned int got_offset)
|
{
|
{
|
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_X86_64_IRELATIVE,
|
{
|
this->got_plt_, got_offset, 0);
|
Reloc_section* rela = this->rela_irelative(symtab, layout);
|
|
rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE,
|
|
this->got_irelative_, got_offset, 0);
|
|
}
|
else
|
else
|
{
|
{
|
gsym->set_needs_dynsym_entry();
|
gsym->set_needs_dynsym_entry();
|
this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
|
this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
|
got_offset, 0);
|
got_offset, 0);
|
| Line 987... |
Line 1100... |
{
|
{
|
this->tlsdesc_rel_ = new Reloc_section(false);
|
this->tlsdesc_rel_ = new Reloc_section(false);
|
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
|
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
|
elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
|
elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
|
ORDER_DYNAMIC_PLT_RELOCS, false);
|
ORDER_DYNAMIC_PLT_RELOCS, false);
|
gold_assert(this->tlsdesc_rel_->output_section() ==
|
gold_assert(this->tlsdesc_rel_->output_section()
|
this->rel_->output_section());
|
== this->rel_->output_section());
|
}
|
}
|
return this->tlsdesc_rel_;
|
return this->tlsdesc_rel_;
|
}
|
}
|
|
|
|
// Return where the IRELATIVE relocations should go in the PLT. These
|
|
// follow the JUMP_SLOT and the TLSDESC relocations.
|
|
|
|
Output_data_plt_x86_64::Reloc_section*
|
|
Output_data_plt_x86_64::rela_irelative(Symbol_table* symtab, Layout* layout)
|
|
{
|
|
if (this->irelative_rel_ == NULL)
|
|
{
|
|
// Make sure we have a place for the TLSDESC relocations, in
|
|
// case we see any later on.
|
|
this->rela_tlsdesc(layout);
|
|
this->irelative_rel_ = new Reloc_section(false);
|
|
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
|
|
elfcpp::SHF_ALLOC, this->irelative_rel_,
|
|
ORDER_DYNAMIC_PLT_RELOCS, false);
|
|
gold_assert(this->irelative_rel_->output_section()
|
|
== this->rel_->output_section());
|
|
|
|
if (parameters->doing_static_link())
|
|
{
|
|
// A statically linked executable will only have a .rela.plt
|
|
// section to hold R_X86_64_IRELATIVE relocs for
|
|
// STT_GNU_IFUNC symbols. The library will use these
|
|
// symbols to locate the IRELATIVE relocs at program startup
|
|
// time.
|
|
symtab->define_in_output_data("__rela_iplt_start", NULL,
|
|
Symbol_table::PREDEFINED,
|
|
this->irelative_rel_, 0, 0,
|
|
elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
|
|
elfcpp::STV_HIDDEN, 0, false, true);
|
|
symtab->define_in_output_data("__rela_iplt_end", NULL,
|
|
Symbol_table::PREDEFINED,
|
|
this->irelative_rel_, 0, 0,
|
|
elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
|
|
elfcpp::STV_HIDDEN, 0, true, true);
|
|
}
|
|
}
|
|
return this->irelative_rel_;
|
|
}
|
|
|
|
// Return the PLT address to use for a global symbol.
|
|
|
|
uint64_t
|
|
Output_data_plt_x86_64::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_x86_64::address_for_local(const Relobj*, unsigned int)
|
|
{
|
|
return this->address() + (this->count_ + 1) * plt_entry_size;
|
|
}
|
|
|
// Set the final size.
|
// Set the final size.
|
void
|
void
|
Output_data_plt_x86_64::set_final_data_size()
|
Output_data_plt_x86_64::set_final_data_size()
|
{
|
{
|
unsigned int count = this->count_;
|
unsigned int count = this->count_ + this->irelative_count_;
|
if (this->has_tlsdesc_entry())
|
if (this->has_tlsdesc_entry())
|
++count;
|
++count;
|
this->set_data_size((count + 1) * plt_entry_size);
|
this->set_data_size((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_x86_64::first_plt_entry[plt_entry_size] =
|
const unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] =
|
{
|
{
|
// From AMD64 ABI Draft 0.98, page 76
|
// From AMD64 ABI Draft 0.98, page 76
|
0xff, 0x35, // pushq contents of memory address
|
0xff, 0x35, // pushq contents of memory address
|
0, 0, 0, 0, // replaced with address of .got + 8
|
0, 0, 0, 0, // replaced with address of .got + 8
|
0xff, 0x25, // jmp indirect
|
0xff, 0x25, // jmp indirect
|
| Line 1017... |
Line 1191... |
0x90, 0x90, 0x90, 0x90 // noop (x4)
|
0x90, 0x90, 0x90, 0x90 // noop (x4)
|
};
|
};
|
|
|
// Subsequent entries in the PLT for an executable.
|
// Subsequent entries in the PLT for an executable.
|
|
|
unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] =
|
const unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] =
|
{
|
{
|
// From AMD64 ABI Draft 0.98, page 76
|
// From AMD64 ABI Draft 0.98, page 76
|
0xff, 0x25, // jmpq indirect
|
0xff, 0x25, // jmpq indirect
|
0, 0, 0, 0, // replaced with address of symbol in .got
|
0, 0, 0, 0, // replaced with address of symbol in .got
|
0x68, // pushq immediate
|
0x68, // pushq immediate
|
| Line 1030... |
Line 1204... |
0, 0, 0, 0 // replaced with offset to start of .plt
|
0, 0, 0, 0 // replaced with offset to start of .plt
|
};
|
};
|
|
|
// The reserved TLSDESC entry in the PLT for an executable.
|
// The reserved TLSDESC entry in the PLT for an executable.
|
|
|
unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] =
|
const unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] =
|
{
|
{
|
// From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
|
// From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
|
// and AMD64/EM64T", Version 0.9.4 (2005-10-10).
|
// and AMD64/EM64T", Version 0.9.4 (2005-10-10).
|
0xff, 0x35, // pushq x(%rip)
|
0xff, 0x35, // pushq x(%rip)
|
0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
|
0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
|
| Line 1042... |
Line 1216... |
0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
|
0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
|
0x0f, 0x1f, // nop
|
0x0f, 0x1f, // nop
|
0x40, 0
|
0x40, 0
|
};
|
};
|
|
|
|
// The .eh_frame unwind information for the PLT.
|
|
|
|
const unsigned char
|
|
Output_data_plt_x86_64::plt_eh_frame_cie[plt_eh_frame_cie_size] =
|
|
{
|
|
1, // CIE version.
|
|
'z', // Augmentation: augmentation size included.
|
|
'R', // Augmentation: FDE encoding included.
|
|
'\0', // End of augmentation string.
|
|
1, // Code alignment factor.
|
|
0x78, // Data alignment factor.
|
|
16, // Return address column.
|
|
1, // Augmentation size.
|
|
(elfcpp::DW_EH_PE_pcrel // FDE encoding.
|
|
| elfcpp::DW_EH_PE_sdata4),
|
|
elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
|
|
elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
|
|
elfcpp::DW_CFA_nop, // Align to 16 bytes.
|
|
elfcpp::DW_CFA_nop
|
|
};
|
|
|
|
const unsigned char
|
|
Output_data_plt_x86_64::plt_eh_frame_fde[plt_eh_frame_fde_size] =
|
|
{
|
|
0, 0, 0, 0, // Replaced with offset to .plt.
|
|
0, 0, 0, 0, // Replaced with size of .plt.
|
|
0, // Augmentation size.
|
|
elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
|
|
elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
|
|
elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
|
|
elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
|
|
elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
|
|
11, // Block length.
|
|
elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
|
|
elfcpp::DW_OP_breg16, 0, // Push %rip.
|
|
elfcpp::DW_OP_lit15, // Push 0xf.
|
|
elfcpp::DW_OP_and, // & (%rip & 0xf).
|
|
elfcpp::DW_OP_lit11, // Push 0xb.
|
|
elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb)
|
|
elfcpp::DW_OP_lit3, // Push 3.
|
|
elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3)
|
|
elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
|
|
elfcpp::DW_CFA_nop, // Align to 32 bytes.
|
|
elfcpp::DW_CFA_nop,
|
|
elfcpp::DW_CFA_nop,
|
|
elfcpp::DW_CFA_nop
|
|
};
|
|
|
// Write out the PLT. This uses the hand-coded instructions above,
|
// Write out the PLT. This uses the hand-coded instructions above,
|
// and adjusts them as needed. This is specified by the AMD64 ABI.
|
// and adjusts them as needed. This is specified by the AMD64 ABI.
|
|
|
void
|
void
|
Output_data_plt_x86_64::do_write(Output_file* of)
|
Output_data_plt_x86_64::do_write(Output_file* of)
|
| Line 1054... |
Line 1276... |
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 1082... |
Line 1308... |
- (plt_address + 12)));
|
- (plt_address + 12)));
|
pov += plt_entry_size;
|
pov += plt_entry_size;
|
|
|
unsigned char* got_pov = got_view;
|
unsigned char* got_pov = got_view;
|
|
|
memset(got_pov, 0, 24);
|
// The first entry in the GOT is the address of the .dynamic section
|
got_pov += 24;
|
// aka the PT_DYNAMIC segment. The next two entries are reserved.
|
|
// We saved space for them when we created the section in
|
|
// Target_x86_64::got_section.
|
|
Output_section* dynamic = this->layout_->dynamic_section();
|
|
uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
|
|
elfcpp::Swap<64, false>::writeval(got_pov, dynamic_addr);
|
|
got_pov += 8;
|
|
memset(got_pov, 0, 16);
|
|
got_pov += 16;
|
|
|
unsigned int plt_offset = plt_entry_size;
|
unsigned int plt_offset = plt_entry_size;
|
unsigned int got_offset = 24;
|
unsigned int got_offset = 24;
|
const unsigned int count = this->count_;
|
const unsigned int count = this->count_ + this->irelative_count_;
|
for (unsigned int plt_index = 0;
|
for (unsigned int plt_index = 0;
|
plt_index < count;
|
plt_index < count;
|
++plt_index,
|
++plt_index,
|
pov += plt_entry_size,
|
pov += plt_entry_size,
|
got_pov += 8,
|
got_pov += 8,
|
| Line 1145... |
Line 1379... |
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_x86_64(symtab, layout, this->got_,
|
this->plt_ = new Output_data_plt_x86_64(layout, this->got_,
|
this->got_plt_);
|
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 1178... |
Line 1413... |
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 1192... |
Line 1427... |
{
|
{
|
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 1267... |
Line 1503... |
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_WRITE,
|
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
|
this->got_tlsdesc_,
|
this->got_tlsdesc_,
|
ORDER_NON_RELRO_FIRST, false);
|
ORDER_NON_RELRO_FIRST, false);
|
|
|
|
// If there are any IRELATIVE relocations, they get GOT entries in
|
|
// .got.plt after the jump slot and TLSDESC entries.
|
|
this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
|
|
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
|
|
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
|
|
this->got_irelative_,
|
|
ORDER_NON_RELRO_FIRST, false);
|
|
|
// Create the PLT section.
|
// Create the PLT section.
|
this->plt_ = new Output_data_plt_x86_64(symtab, layout, this->got_,
|
this->plt_ = new Output_data_plt_x86_64(layout, this->got_, this->got_plt_,
|
this->got_plt_, plt_count);
|
this->got_irelative_, plt_count);
|
layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
|
layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
|
elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
|
elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
|
this->plt_, ORDER_PLT, false);
|
this->plt_, ORDER_PLT, false);
|
|
|
// Make the sh_info field of .rela.plt point to .plt.
|
// Make the sh_info field of .rela.plt point to .plt.
|
| Line 1376... |
Line 1620... |
}
|
}
|
|
|
// Register an existing PLT entry for a global symbol.
|
// Register an existing PLT entry for a global symbol.
|
|
|
void
|
void
|
Target_x86_64::register_global_plt_entry(unsigned int plt_index,
|
Target_x86_64::register_global_plt_entry(Symbol_table* symtab,
|
|
Layout* layout,
|
|
unsigned int plt_index,
|
Symbol* gsym)
|
Symbol* gsym)
|
{
|
{
|
gold_assert(this->plt_ != NULL);
|
gold_assert(this->plt_ != NULL);
|
gold_assert(!gsym->has_plt_offset());
|
gold_assert(!gsym->has_plt_offset());
|
|
|
this->plt_->reserve_slot(plt_index);
|
this->plt_->reserve_slot(plt_index);
|
|
|
gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
|
gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
|
|
|
unsigned int got_offset = (plt_index + 3) * 8;
|
unsigned int got_offset = (plt_index + 3) * 8;
|
this->plt_->add_relocation(gsym, got_offset);
|
this->plt_->add_relocation(symtab, layout, gsym, got_offset);
|
}
|
}
|
|
|
// Force a COPY relocation for a given symbol.
|
// Force a COPY relocation for a given symbol.
|
|
|
void
|
void
|
| Line 1608... |
Line 1854... |
// dynamic linker does not support it, issue an error. The GNU linker
|
// dynamic linker does not support it, issue an error. The GNU linker
|
// only issues a non-PIC error for an allocated read-only section.
|
// only issues a non-PIC error for an allocated read-only section.
|
// Here we know the section is allocated, but we don't know that it is
|
// Here we know the section is allocated, but we don't know that it is
|
// read-only. But we check for all the relocation types which the
|
// read-only. But we check for all the relocation types which the
|
// glibc dynamic linker supports, so it seems appropriate to issue an
|
// glibc dynamic linker supports, so it seems appropriate to issue an
|
// error even if the section is not read-only.
|
// error even if the section is not read-only. If GSYM is not NULL,
|
|
// it is the symbol the relocation is against; if it is NULL, the
|
|
// relocation is against a local symbol.
|
|
|
void
|
void
|
Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type)
|
Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type,
|
|
Symbol* gsym)
|
{
|
{
|
switch (r_type)
|
switch (r_type)
|
{
|
{
|
// These are the relocation types supported by glibc for x86_64
|
// These are the relocation types supported by glibc for x86_64
|
// which should always work.
|
// which should always work.
|
| Line 1629... |
Line 1878... |
case elfcpp::R_X86_64_64:
|
case elfcpp::R_X86_64_64:
|
case elfcpp::R_X86_64_COPY:
|
case elfcpp::R_X86_64_COPY:
|
return;
|
return;
|
|
|
// glibc supports these reloc types, but they can overflow.
|
// glibc supports these reloc types, but they can overflow.
|
case elfcpp::R_X86_64_32:
|
|
case elfcpp::R_X86_64_PC32:
|
case elfcpp::R_X86_64_PC32:
|
|
// A PC relative reference is OK against a local symbol or if
|
|
// the symbol is defined locally.
|
|
if (gsym == NULL
|
|
|| (!gsym->is_from_dynobj()
|
|
&& !gsym->is_undefined()
|
|
&& !gsym->is_preemptible()))
|
|
return;
|
|
/* Fall through. */
|
|
case elfcpp::R_X86_64_32:
|
if (this->issued_non_pic_error_)
|
if (this->issued_non_pic_error_)
|
return;
|
return;
|
gold_assert(parameters->options().output_is_position_independent());
|
gold_assert(parameters->options().output_is_position_independent());
|
object->error(_("requires dynamic reloc which may overflow at runtime; "
|
if (gsym == NULL)
|
"recompile with -fPIC"));
|
object->error(_("requires dynamic R_X86_64_32 reloc which may "
|
|
"overflow at runtime; recompile with -fPIC"));
|
|
else
|
|
object->error(_("requires dynamic %s reloc against '%s' which may "
|
|
"overflow at runtime; recompile with -fPIC"),
|
|
(r_type == elfcpp::R_X86_64_32
|
|
? "R_X86_64_32"
|
|
: "R_X86_64_PC32"),
|
|
gsym->name());
|
this->issued_non_pic_error_ = true;
|
this->issued_non_pic_error_ = true;
|
return;
|
return;
|
|
|
default:
|
default:
|
// This prevents us from issuing more than one error per reloc
|
// This prevents us from issuing more than one error per reloc
|
// section. But we can still wind up issuing more than one
|
// section. But we can still wind up issuing more than one
|
// error per object file.
|
// error per object file.
|
if (this->issued_non_pic_error_)
|
if (this->issued_non_pic_error_)
|
return;
|
return;
|
gold_assert(parameters->options().output_is_position_independent());
|
gold_assert(parameters->options().output_is_position_independent());
|
object->error(_("requires unsupported dynamic reloc; "
|
object->error(_("requires unsupported dynamic reloc %u; "
|
"recompile with -fPIC"));
|
"recompile with -fPIC"),
|
|
r_type);
|
this->issued_non_pic_error_ = true;
|
this->issued_non_pic_error_ = true;
|
return;
|
return;
|
|
|
case elfcpp::R_X86_64_NONE:
|
case elfcpp::R_X86_64_NONE:
|
gold_unreachable();
|
gold_unreachable();
|
| Line 1728... |
Line 1994... |
// executable), we need to create a dynamic relocation for this
|
// executable), we need to create a dynamic relocation for this
|
// location. We can't use an R_X86_64_RELATIVE relocation
|
// location. We can't use an R_X86_64_RELATIVE relocation
|
// because that is always a 64-bit relocation.
|
// because that is always a 64-bit relocation.
|
if (parameters->options().output_is_position_independent())
|
if (parameters->options().output_is_position_independent())
|
{
|
{
|
this->check_non_pic(object, r_type);
|
this->check_non_pic(object, r_type, NULL);
|
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
|
unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
|
if (lsym.get_st_type() != elfcpp::STT_SECTION)
|
if (lsym.get_st_type() != elfcpp::STT_SECTION)
|
rela_dyn->add_local(object, r_sym, r_type, output_section,
|
rela_dyn->add_local(object, r_sym, r_type, output_section,
|
| Line 1812... |
Line 2078... |
elfcpp::R_X86_64_RELATIVE,
|
elfcpp::R_X86_64_RELATIVE,
|
got, got_offset, 0);
|
got, got_offset, 0);
|
}
|
}
|
else
|
else
|
{
|
{
|
this->check_non_pic(object, r_type);
|
this->check_non_pic(object, r_type, NULL);
|
|
|
gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
|
gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
|
rela_dyn->add_local(
|
rela_dyn->add_local(
|
object, r_sym, r_type, got,
|
object, r_sym, r_type, got,
|
object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
|
object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
|
| Line 2113... |
Line 2379... |
{
|
{
|
// 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* rela_dyn = target->rela_dyn_section(layout);
|
Reloc_section* rela_dyn =
|
|
target->rela_irelative_section(layout);
|
unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
|
unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
|
rela_dyn->add_symbolless_global_addend(gsym, r_type,
|
rela_dyn->add_symbolless_global_addend(gsym, r_type,
|
output_section, object,
|
output_section, object,
|
data_shndx,
|
data_shndx,
|
reloc.get_r_offset(),
|
reloc.get_r_offset(),
|
| Line 2133... |
Line 2400... |
reloc.get_r_offset(),
|
reloc.get_r_offset(),
|
reloc.get_r_addend());
|
reloc.get_r_addend());
|
}
|
}
|
else
|
else
|
{
|
{
|
this->check_non_pic(object, r_type);
|
this->check_non_pic(object, r_type, gsym);
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
rela_dyn->add_global(gsym, r_type, output_section, object,
|
rela_dyn->add_global(gsym, r_type, output_section, object,
|
data_shndx, reloc.get_r_offset(),
|
data_shndx, reloc.get_r_offset(),
|
reloc.get_r_addend());
|
reloc.get_r_addend());
|
}
|
}
|
| Line 2161... |
Line 2428... |
target->copy_reloc(symtab, layout, object,
|
target->copy_reloc(symtab, layout, object,
|
data_shndx, output_section, gsym, reloc);
|
data_shndx, output_section, gsym, reloc);
|
}
|
}
|
else
|
else
|
{
|
{
|
this->check_non_pic(object, r_type);
|
this->check_non_pic(object, r_type, gsym);
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
rela_dyn->add_global(gsym, r_type, output_section, object,
|
rela_dyn->add_global(gsym, r_type, output_section, object,
|
data_shndx, reloc.get_r_offset(),
|
data_shndx, reloc.get_r_offset(),
|
reloc.get_r_addend());
|
reloc.get_r_addend());
|
}
|
}
|
| Line 2192... |
Line 2459... |
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
|
// dynamic relocation for it.
|
// dynamic relocation for it.
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
|
|
// Use a GLOB_DAT rather than a RELATIVE reloc if:
|
|
//
|
|
// 1) The symbol may be defined in some other module.
|
|
//
|
|
// 2) We are building a shared library and this is a
|
|
// protected symbol; using GLOB_DAT means that the dynamic
|
|
// linker can use the address of the PLT in the main
|
|
// executable when appropriate so that function address
|
|
// comparisons work.
|
|
//
|
|
// 3) This is a STT_GNU_IFUNC symbol in position dependent
|
|
// code, again so that function address comparisons work.
|
if (gsym->is_from_dynobj()
|
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_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
|
got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
|
elfcpp::R_X86_64_GLOB_DAT);
|
elfcpp::R_X86_64_GLOB_DAT);
|
else
|
else
|
| Line 2516... |
Line 2798... |
if (sym != NULL)
|
if (sym != NULL)
|
{
|
{
|
uint64_t data_size = this->got_plt_->current_data_size();
|
uint64_t data_size = this->got_plt_->current_data_size();
|
symtab->get_sized_symbol<64>(sym)->set_symsize(data_size);
|
symtab->get_sized_symbol<64>(sym)->set_symsize(data_size);
|
}
|
}
|
|
|
|
if (parameters->doing_static_link()
|
|
&& (this->plt_ == NULL || !this->plt_->has_irelative_section()))
|
|
{
|
|
// If linking statically, make sure that the __rela_iplt symbols
|
|
// were defined if necessary, even if we didn't create a PLT.
|
|
static const Define_symbol_in_segment syms[] =
|
|
{
|
|
{
|
|
"__rela_iplt_start", // name
|
|
elfcpp::PT_LOAD, // segment_type
|
|
elfcpp::PF_W, // segment_flags_set
|
|
elfcpp::PF(0), // segment_flags_clear
|
|
0, // value
|
|
0, // size
|
|
elfcpp::STT_NOTYPE, // type
|
|
elfcpp::STB_GLOBAL, // binding
|
|
elfcpp::STV_HIDDEN, // visibility
|
|
0, // nonvis
|
|
Symbol::SEGMENT_START, // offset_from_base
|
|
true // only_if_ref
|
|
},
|
|
{
|
|
"__rela_iplt_end", // name
|
|
elfcpp::PT_LOAD, // segment_type
|
|
elfcpp::PF_W, // segment_flags_set
|
|
elfcpp::PF(0), // segment_flags_clear
|
|
0, // value
|
|
0, // size
|
|
elfcpp::STT_NOTYPE, // type
|
|
elfcpp::STB_GLOBAL, // binding
|
|
elfcpp::STV_HIDDEN, // visibility
|
|
0, // nonvis
|
|
Symbol::SEGMENT_START, // offset_from_base
|
|
true // only_if_ref
|
|
}
|
|
};
|
|
|
|
symtab->define_symbols(layout, 2, syms,
|
|
layout->script_options()->saw_sections_clause());
|
|
}
|
}
|
}
|
|
|
// Perform a relocation.
|
// Perform a relocation.
|
|
|
inline bool
|
inline bool
|
| Line 2557... |
Line 2880... |
// Pick the value to use for symbols defined in the PLT.
|
// Pick the value to use for symbols defined in the PLT.
|
Symbol_value<64> symval;
|
Symbol_value<64> symval;
|
if (gsym != NULL
|
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<64>(rela.get_r_info());
|
unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.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 2825... |
Line 3148... |
// leave it unoptimized.
|
// leave it unoptimized.
|
optimized_type = tls::TLSOPT_NONE;
|
optimized_type = tls::TLSOPT_NONE;
|
}
|
}
|
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,
|
rela, r_type, value, view,
|
rela, r_type, value, view,
|
view_size);
|
view_size);
|
break;
|
break;
|
}
|
}
|
| Line 2851... |
Line 3179... |
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;
|
|
}
|
value = target->got_plt_section()->address() + got_offset;
|
value = target->got_plt_section()->address() + got_offset;
|
this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
|
this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
|
value, view, address, view_size);
|
value, view, address, view_size);
|
break;
|
break;
|
}
|
}
|
| Line 2880... |
Line 3213... |
// See above comment for R_X86_64_TLSGD.
|
// See above comment for R_X86_64_TLSGD.
|
optimized_type = tls::TLSOPT_NONE;
|
optimized_type = tls::TLSOPT_NONE;
|
}
|
}
|
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,
|
rela, r_type, value, view,
|
rela, r_type, value, view,
|
view_size);
|
view_size);
|
break;
|
break;
|
}
|
}
|
| Line 2915... |
Line 3253... |
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;
|
|
}
|
value = target->got_plt_section()->address() + got_offset;
|
value = target->got_plt_section()->address() + got_offset;
|
this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
|
this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
|
rela, r_type, value, view, address,
|
rela, r_type, value, view, address,
|
view_size);
|
view_size);
|
break;
|
break;
|
| Line 2947... |
Line 3290... |
// See above comment for R_X86_64_TLSGD.
|
// See above comment for R_X86_64_TLSGD.
|
optimized_type = tls::TLSOPT_NONE;
|
optimized_type = tls::TLSOPT_NONE;
|
}
|
}
|
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, rela, r_type,
|
this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, 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 2977... |
Line 3325... |
// optimize this reloc. See comments above for R_X86_64_TLSGD,
|
// optimize this reloc. See comments above for R_X86_64_TLSGD,
|
// R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
|
// R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
|
// R_X86_64_TLSLD.
|
// R_X86_64_TLSLD.
|
if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
|
if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
|
{
|
{
|
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<64, false>::rela32(view, value, addend);
|
Relocate_functions<64, false>::rela32(view, value, addend);
|
break;
|
break;
|
|
|
case elfcpp::R_X86_64_DTPOFF64:
|
case elfcpp::R_X86_64_DTPOFF64:
|
// See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
|
// See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
|
if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
|
if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
|
{
|
{
|
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<64, false>::rela64(view, value, addend);
|
Relocate_functions<64, false>::rela64(view, value, addend);
|
break;
|
break;
|
|
|
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
|
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
|
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_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
|
Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
|
rela, r_type, value, view,
|
rela, r_type, value, view,
|
view_size);
|
view_size);
|
break;
|
break;
|
}
|
}
|
| Line 3031... |
Line 3394... |
_("unsupported reloc type %u"),
|
_("unsupported reloc type %u"),
|
r_type);
|
r_type);
|
break;
|
break;
|
|
|
case elfcpp::R_X86_64_TPOFF32: // Local-exec
|
case elfcpp::R_X86_64_TPOFF32: // Local-exec
|
|
if (tls_segment == NULL)
|
|
{
|
|
gold_assert(parameters->errors()->error_count() > 0
|
|
|| issue_undefined_symbol_error(gsym));
|
|
return;
|
|
}
|
value -= tls_segment->memsz();
|
value -= tls_segment->memsz();
|
Relocate_functions<64, false>::rela32(view, value, addend);
|
Relocate_functions<64, false>::rela32(view, value, addend);
|
break;
|
break;
|
}
|
}
|
}
|
}
|
| Line 3476... |
Line 3845... |
|
|
uint64_t
|
uint64_t
|
Target_x86_64::do_dynsym_value(const Symbol* gsym) const
|
Target_x86_64::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 3561... |
Line 3930... |
gold_assert(psymval->is_tls_symbol());
|
gold_assert(psymval->is_tls_symbol());
|
// The value of a TLS symbol is the offset in the TLS segment.
|
// The value of a TLS symbol is the offset in the TLS segment.
|
return psymval->value(ti.object, 0);
|
return psymval->value(ti.object, 0);
|
}
|
}
|
|
|
|
// Return the value to use for the base of a DW_EH_PE_datarel offset
|
|
// in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
|
|
// assembler can not write out the difference between two labels in
|
|
// different sections, so instead of using a pc-relative value they
|
|
// use an offset from the GOT.
|
|
|
|
uint64_t
|
|
Target_x86_64::do_ehframe_datarel_base() const
|
|
{
|
|
gold_assert(this->global_offset_table_ != NULL);
|
|
Symbol* sym = this->global_offset_table_;
|
|
Sized_symbol<64>* ssym = static_cast<Sized_symbol<64>*>(sym);
|
|
return ssym->value();
|
|
}
|
|
|
// FNOFFSET in section SHNDX in OBJECT is the start of a function
|
// FNOFFSET in section SHNDX in OBJECT is the start of a function
|
// compiled with -fsplit-stack. The function calls non-split-stack
|
// compiled with -fsplit-stack. The function calls non-split-stack
|
// code. We have to change the function so that it always ensures
|
// code. We have to change the function so that it always ensures
|
// that it has enough stack space to run some random function.
|
// that it has enough stack space to run some random function.
|
|
|
| Line 3629... |
Line 4013... |
class Target_selector_x86_64 : public Target_selector_freebsd
|
class Target_selector_x86_64 : public Target_selector_freebsd
|
{
|
{
|
public:
|
public:
|
Target_selector_x86_64()
|
Target_selector_x86_64()
|
: Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64",
|
: Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64",
|
"elf64-x86-64-freebsd")
|
"elf64-x86-64-freebsd", "elf_x86_64")
|
{ }
|
{ }
|
|
|
Target*
|
Target*
|
do_instantiate_target()
|
do_instantiate_target()
|
{ return new Target_x86_64(); }
|
{ return new Target_x86_64(); }
|
