707 lines
22 KiB
C++
707 lines
22 KiB
C++
// reloc.h -- relocate input files for gold -*- C++ -*-
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// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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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 program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#ifndef GOLD_RELOC_H
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#define GOLD_RELOC_H
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#include <vector>
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#ifdef HAVE_BYTESWAP_H
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#include <byteswap.h>
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#endif
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#include "elfcpp.h"
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#include "workqueue.h"
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namespace gold
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{
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class General_options;
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class Object;
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class Relobj;
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class Read_relocs_data;
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class Symbol;
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class Layout;
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class Output_data;
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class Output_section;
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template<int size>
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class Sized_symbol;
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template<int size, bool big_endian>
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class Sized_relobj;
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template<int size>
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class Symbol_value;
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template<int sh_type, bool dynamic, int size, bool big_endian>
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class Output_data_reloc;
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// A class to read the relocations for an object file, and then queue
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// up a task to see if they require any GOT/PLT/COPY relocations in
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// the symbol table.
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class Read_relocs : public Task
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{
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public:
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// SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
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// unblocked when the Scan_relocs task completes.
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Read_relocs(const General_options& options, Symbol_table* symtab,
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Layout* layout, Relobj* object, Task_token* symtab_lock,
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Task_token* blocker)
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: options_(options), symtab_(symtab), layout_(layout), object_(object),
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symtab_lock_(symtab_lock), blocker_(blocker)
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{ }
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const;
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private:
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const General_options& options_;
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Symbol_table* symtab_;
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Layout* layout_;
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Relobj* object_;
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Task_token* symtab_lock_;
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Task_token* blocker_;
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};
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// Process the relocs to figure out which sections are garbage.
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// Very similar to scan relocs.
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class Gc_process_relocs : public Task
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{
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public:
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// SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
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// unblocked when the task completes.
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Gc_process_relocs(const General_options& options, Symbol_table* symtab,
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Layout* layout, Relobj* object, Read_relocs_data* rd,
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Task_token* symtab_lock, Task_token* blocker)
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: options_(options), symtab_(symtab), layout_(layout), object_(object),
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rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker)
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{ }
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const;
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private:
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const General_options& options_;
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Symbol_table* symtab_;
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Layout* layout_;
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Relobj* object_;
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Read_relocs_data* rd_;
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Task_token* symtab_lock_;
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Task_token* blocker_;
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};
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// Scan the relocations for an object to see if they require any
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// GOT/PLT/COPY relocations.
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class Scan_relocs : public Task
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{
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public:
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// SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
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// unblocked when the task completes.
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Scan_relocs(const General_options& options, Symbol_table* symtab,
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Layout* layout, Relobj* object, Read_relocs_data* rd,
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Task_token* symtab_lock, Task_token* blocker)
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: options_(options), symtab_(symtab), layout_(layout), object_(object),
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rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker)
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{ }
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const;
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private:
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const General_options& options_;
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Symbol_table* symtab_;
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Layout* layout_;
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Relobj* object_;
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Read_relocs_data* rd_;
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Task_token* symtab_lock_;
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Task_token* blocker_;
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};
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// A class to perform all the relocations for an object file.
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class Relocate_task : public Task
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{
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public:
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Relocate_task(const General_options& options, const Symbol_table* symtab,
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const Layout* layout, Relobj* object, Output_file* of,
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Task_token* input_sections_blocker,
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Task_token* output_sections_blocker, Task_token* final_blocker)
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: options_(options), symtab_(symtab), layout_(layout), object_(object),
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of_(of), input_sections_blocker_(input_sections_blocker),
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output_sections_blocker_(output_sections_blocker),
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final_blocker_(final_blocker)
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{ }
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const;
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private:
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const General_options& options_;
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const Symbol_table* symtab_;
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const Layout* layout_;
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Relobj* object_;
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Output_file* of_;
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Task_token* input_sections_blocker_;
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Task_token* output_sections_blocker_;
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Task_token* final_blocker_;
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};
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// During a relocatable link, this class records how relocations
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// should be handled for a single input reloc section. An instance of
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// this class is created while scanning relocs, and it is used while
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// processing relocs.
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class Relocatable_relocs
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{
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public:
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// We use a vector of unsigned char to indicate how the input relocs
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// should be handled. Each element is one of the following values.
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// We create this vector when we initially scan the relocations.
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enum Reloc_strategy
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{
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// Copy the input reloc. Don't modify it other than updating the
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// r_offset field and the r_sym part of the r_info field.
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RELOC_COPY,
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// Copy the input reloc which is against an STT_SECTION symbol.
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// Update the r_offset and r_sym part of the r_info field. Adjust
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// the addend by subtracting the value of the old local symbol and
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// adding the value of the new local symbol. The addend is in the
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// SHT_RELA reloc and the contents of the data section do not need
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// to be changed.
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RELOC_ADJUST_FOR_SECTION_RELA,
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// Like RELOC_ADJUST_FOR_SECTION_RELA but the addend should not be
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// adjusted.
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RELOC_ADJUST_FOR_SECTION_0,
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// Like RELOC_ADJUST_FOR_SECTION_RELA but the contents of the
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// section need to be changed. The number indicates the number of
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// bytes in the addend in the section contents.
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RELOC_ADJUST_FOR_SECTION_1,
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RELOC_ADJUST_FOR_SECTION_2,
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RELOC_ADJUST_FOR_SECTION_4,
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RELOC_ADJUST_FOR_SECTION_8,
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// Discard the input reloc--process it completely when relocating
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// the data section contents.
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RELOC_DISCARD,
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// An input reloc which is not discarded, but which requires
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// target specific processing in order to update it.
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RELOC_SPECIAL
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};
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Relocatable_relocs()
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: reloc_strategies_(), output_reloc_count_(0), posd_(NULL)
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{ }
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// Record the number of relocs.
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void
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set_reloc_count(size_t reloc_count)
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{ this->reloc_strategies_.reserve(reloc_count); }
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// Record what to do for the next reloc.
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void
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set_next_reloc_strategy(Reloc_strategy strategy)
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{
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this->reloc_strategies_.push_back(static_cast<unsigned char>(strategy));
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if (strategy != RELOC_DISCARD)
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++this->output_reloc_count_;
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}
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// Record the Output_data associated with this reloc section.
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void
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set_output_data(Output_data* posd)
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{
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gold_assert(this->posd_ == NULL);
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this->posd_ = posd;
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}
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// Return the Output_data associated with this reloc section.
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Output_data*
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output_data() const
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{ return this->posd_; }
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// Return what to do for reloc I.
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Reloc_strategy
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strategy(unsigned int i) const
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{
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gold_assert(i < this->reloc_strategies_.size());
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return static_cast<Reloc_strategy>(this->reloc_strategies_[i]);
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}
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// Return the number of relocations to create in the output file.
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size_t
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output_reloc_count() const
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{ return this->output_reloc_count_; }
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private:
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typedef std::vector<unsigned char> Reloc_strategies;
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// The strategies for the input reloc. There is one entry in this
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// vector for each relocation in the input section.
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Reloc_strategies reloc_strategies_;
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// The number of relocations to be created in the output file.
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size_t output_reloc_count_;
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// The output data structure associated with this relocation.
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Output_data* posd_;
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};
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// Standard relocation routines which are used on many targets. Here
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// SIZE and BIG_ENDIAN refer to the target, not the relocation type.
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template<int size, bool big_endian>
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class Relocate_functions
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{
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private:
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// Do a simple relocation with the addend in the section contents.
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// VALSIZE is the size of the value.
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template<int valsize>
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static inline void
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rel(unsigned char* view,
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typename elfcpp::Swap<valsize, big_endian>::Valtype value)
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{
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typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
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elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value);
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}
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// Do a simple relocation using a Symbol_value with the addend in
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// the section contents. VALSIZE is the size of the value to
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// relocate.
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template<int valsize>
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static inline void
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rel(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval)
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{
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typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
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x = psymval->value(object, x);
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elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
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}
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// Do a simple relocation with the addend in the relocation.
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// VALSIZE is the size of the value.
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template<int valsize>
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static inline void
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rela(unsigned char* view,
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typename elfcpp::Swap<valsize, big_endian>::Valtype value,
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typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
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{
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typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend);
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}
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// Do a simple relocation using a symbol value with the addend in
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// the relocation. VALSIZE is the size of the value.
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template<int valsize>
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static inline void
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rela(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval,
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typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
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{
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typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype x = psymval->value(object, addend);
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elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
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}
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// Do a simple PC relative relocation with the addend in the section
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// contents. VALSIZE is the size of the value.
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template<int valsize>
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static inline void
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pcrel(unsigned char* view,
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typename elfcpp::Swap<valsize, big_endian>::Valtype value,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{
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typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
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elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address);
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}
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// Do a simple PC relative relocation with a Symbol_value with the
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// addend in the section contents. VALSIZE is the size of the
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// value.
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template<int valsize>
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static inline void
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pcrel(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{
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typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
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x = psymval->value(object, x);
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elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address);
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}
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// Do a simple PC relative relocation with the addend in the
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// relocation. VALSIZE is the size of the value.
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template<int valsize>
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static inline void
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pcrela(unsigned char* view,
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typename elfcpp::Swap<valsize, big_endian>::Valtype value,
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typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{
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typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address);
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}
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// Do a simple PC relative relocation with a Symbol_value with the
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// addend in the relocation. VALSIZE is the size of the value.
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template<int valsize>
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static inline void
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pcrela(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval,
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typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{
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typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype x = psymval->value(object, addend);
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elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address);
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}
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typedef Relocate_functions<size, big_endian> This;
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public:
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// Do a simple 8-bit REL relocation with the addend in the section
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// contents.
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static inline void
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rel8(unsigned char* view, unsigned char value)
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{ This::template rel<8>(view, value); }
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static inline void
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rel8(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval)
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{ This::template rel<8>(view, object, psymval); }
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// Do an 8-bit RELA relocation with the addend in the relocation.
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static inline void
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rela8(unsigned char* view, unsigned char value, unsigned char addend)
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{ This::template rela<8>(view, value, addend); }
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static inline void
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rela8(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval,
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unsigned char addend)
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{ This::template rela<8>(view, object, psymval, addend); }
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// Do a simple 8-bit PC relative relocation with the addend in the
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// section contents.
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static inline void
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pcrel8(unsigned char* view, unsigned char value,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{ This::template pcrel<8>(view, value, address); }
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static inline void
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pcrel8(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{ This::template pcrel<8>(view, object, psymval, address); }
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// Do a simple 8-bit PC relative RELA relocation with the addend in
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// the reloc.
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static inline void
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pcrela8(unsigned char* view, unsigned char value, unsigned char addend,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{ This::template pcrela<8>(view, value, addend, address); }
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static inline void
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pcrela8(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval,
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unsigned char addend,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{ This::template pcrela<8>(view, object, psymval, addend, address); }
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// Do a simple 16-bit REL relocation with the addend in the section
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// contents.
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static inline void
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rel16(unsigned char* view, elfcpp::Elf_Half value)
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{ This::template rel<16>(view, value); }
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static inline void
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rel16(unsigned char* view,
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const Sized_relobj<size, big_endian>* object,
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const Symbol_value<size>* psymval)
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|
{ This::template rel<16>(view, object, psymval); }
|
|
|
|
// Do an 16-bit RELA relocation with the addend in the relocation.
|
|
static inline void
|
|
rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend)
|
|
{ This::template rela<16>(view, value, addend); }
|
|
|
|
static inline void
|
|
rela16(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
elfcpp::Elf_Half addend)
|
|
{ This::template rela<16>(view, object, psymval, addend); }
|
|
|
|
// Do a simple 16-bit PC relative REL relocation with the addend in
|
|
// the section contents.
|
|
static inline void
|
|
pcrel16(unsigned char* view, elfcpp::Elf_Half value,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrel<16>(view, value, address); }
|
|
|
|
static inline void
|
|
pcrel16(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrel<16>(view, object, psymval, address); }
|
|
|
|
// Do a simple 16-bit PC relative RELA relocation with the addend in
|
|
// the reloc.
|
|
static inline void
|
|
pcrela16(unsigned char* view, elfcpp::Elf_Half value,
|
|
elfcpp::Elf_Half addend,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrela<16>(view, value, addend, address); }
|
|
|
|
static inline void
|
|
pcrela16(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
elfcpp::Elf_Half addend,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrela<16>(view, object, psymval, addend, address); }
|
|
|
|
// Do a simple 32-bit REL relocation with the addend in the section
|
|
// contents.
|
|
static inline void
|
|
rel32(unsigned char* view, elfcpp::Elf_Word value)
|
|
{ This::template rel<32>(view, value); }
|
|
|
|
static inline void
|
|
rel32(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval)
|
|
{ This::template rel<32>(view, object, psymval); }
|
|
|
|
// Do an 32-bit RELA relocation with the addend in the relocation.
|
|
static inline void
|
|
rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend)
|
|
{ This::template rela<32>(view, value, addend); }
|
|
|
|
static inline void
|
|
rela32(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
elfcpp::Elf_Word addend)
|
|
{ This::template rela<32>(view, object, psymval, addend); }
|
|
|
|
// Do a simple 32-bit PC relative REL relocation with the addend in
|
|
// the section contents.
|
|
static inline void
|
|
pcrel32(unsigned char* view, elfcpp::Elf_Word value,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrel<32>(view, value, address); }
|
|
|
|
static inline void
|
|
pcrel32(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrel<32>(view, object, psymval, address); }
|
|
|
|
// Do a simple 32-bit PC relative RELA relocation with the addend in
|
|
// the relocation.
|
|
static inline void
|
|
pcrela32(unsigned char* view, elfcpp::Elf_Word value,
|
|
elfcpp::Elf_Word addend,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrela<32>(view, value, addend, address); }
|
|
|
|
static inline void
|
|
pcrela32(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
elfcpp::Elf_Word addend,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrela<32>(view, object, psymval, addend, address); }
|
|
|
|
// Do a simple 64-bit REL relocation with the addend in the section
|
|
// contents.
|
|
static inline void
|
|
rel64(unsigned char* view, elfcpp::Elf_Xword value)
|
|
{ This::template rel<64>(view, value); }
|
|
|
|
static inline void
|
|
rel64(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval)
|
|
{ This::template rel<64>(view, object, psymval); }
|
|
|
|
// Do a 64-bit RELA relocation with the addend in the relocation.
|
|
static inline void
|
|
rela64(unsigned char* view, elfcpp::Elf_Xword value,
|
|
elfcpp::Elf_Xword addend)
|
|
{ This::template rela<64>(view, value, addend); }
|
|
|
|
static inline void
|
|
rela64(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
elfcpp::Elf_Xword addend)
|
|
{ This::template rela<64>(view, object, psymval, addend); }
|
|
|
|
// Do a simple 64-bit PC relative REL relocation with the addend in
|
|
// the section contents.
|
|
static inline void
|
|
pcrel64(unsigned char* view, elfcpp::Elf_Xword value,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrel<64>(view, value, address); }
|
|
|
|
static inline void
|
|
pcrel64(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrel<64>(view, object, psymval, address); }
|
|
|
|
// Do a simple 64-bit PC relative RELA relocation with the addend in
|
|
// the relocation.
|
|
static inline void
|
|
pcrela64(unsigned char* view, elfcpp::Elf_Xword value,
|
|
elfcpp::Elf_Xword addend,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrela<64>(view, value, addend, address); }
|
|
|
|
static inline void
|
|
pcrela64(unsigned char* view,
|
|
const Sized_relobj<size, big_endian>* object,
|
|
const Symbol_value<size>* psymval,
|
|
elfcpp::Elf_Xword addend,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address)
|
|
{ This::template pcrela<64>(view, object, psymval, addend, address); }
|
|
};
|
|
|
|
// Track relocations while reading a section. This lets you ask for
|
|
// the relocation at a certain offset, and see how relocs occur
|
|
// between points of interest.
|
|
|
|
template<int size, bool big_endian>
|
|
class Track_relocs
|
|
{
|
|
public:
|
|
Track_relocs()
|
|
: prelocs_(NULL), len_(0), pos_(0), reloc_size_(0)
|
|
{ }
|
|
|
|
// Initialize the Track_relocs object. OBJECT is the object holding
|
|
// the reloc section, RELOC_SHNDX is the section index of the reloc
|
|
// section, and RELOC_TYPE is the type of the reloc section
|
|
// (elfcpp::SHT_REL or elfcpp::SHT_RELA). This returns false if
|
|
// something went wrong.
|
|
bool
|
|
initialize(Object* object, unsigned int reloc_shndx,
|
|
unsigned int reloc_type);
|
|
|
|
// Return the offset in the data section to which the next reloc
|
|
// applies. THis returns -1 if there is no next reloc.
|
|
off_t
|
|
next_offset() const;
|
|
|
|
// Return the symbol index of the next reloc. This returns -1U if
|
|
// there is no next reloc.
|
|
unsigned int
|
|
next_symndx() const;
|
|
|
|
// Advance to OFFSET within the data section, and return the number
|
|
// of relocs which would be skipped.
|
|
int
|
|
advance(off_t offset);
|
|
|
|
private:
|
|
// The contents of the input object's reloc section.
|
|
const unsigned char* prelocs_;
|
|
// The length of the reloc section.
|
|
section_size_type len_;
|
|
// Our current position in the reloc section.
|
|
section_size_type pos_;
|
|
// The size of the relocs in the section.
|
|
int reloc_size_;
|
|
};
|
|
|
|
} // End namespace gold.
|
|
|
|
#endif // !defined(GOLD_RELOC_H)
|