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// reloc.h -- relocate input files for gold -*- C++ -*-
#ifndef GOLD_RELOC_H
#define GOLD_RELOC_H
#include <byteswap.h>
#include "workqueue.h"
namespace gold
{
class Relobj;
class Read_relocs_data;
class Stringpool;
class Layout;
// A class to read the relocations for an object file, and then queue
// up a task to see if they require any GOT/PLT/COPY relocations in
// the symbol table.
class Read_relocs : public Task
{
public:
// SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
// unblocked when the Scan_relocs task completes.
Read_relocs(const General_options& options, Symbol_table* symtab,
Layout* layout, Relobj* object, Task_token* symtab_lock,
Task_token* blocker)
: options_(options), symtab_(symtab), layout_(layout), object_(object),
symtab_lock_(symtab_lock), blocker_(blocker)
{ }
// The standard Task methods.
Is_runnable_type
is_runnable(Workqueue*);
Task_locker*
locks(Workqueue*);
void
run(Workqueue*);
private:
const General_options& options_;
Symbol_table* symtab_;
Layout* layout_;
Relobj* object_;
Task_token* symtab_lock_;
Task_token* blocker_;
};
// Scan the relocations for an object to see if they require any
// GOT/PLT/COPY relocations.
class Scan_relocs : public Task
{
public:
// SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
// unblocked when the task completes.
Scan_relocs(const General_options& options, Symbol_table* symtab,
Layout* layout, Relobj* object, Read_relocs_data* rd,
Task_token* symtab_lock, Task_token* blocker)
: options_(options), symtab_(symtab), layout_(layout), object_(object),
rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker)
{ }
// The standard Task methods.
Is_runnable_type
is_runnable(Workqueue*);
Task_locker*
locks(Workqueue*);
void
run(Workqueue*);
private:
class Scan_relocs_locker;
const General_options& options_;
Symbol_table* symtab_;
Layout* layout_;
Relobj* object_;
Read_relocs_data* rd_;
Task_token* symtab_lock_;
Task_token* blocker_;
};
// A class to perform all the relocations for an object file.
class Relocate_task : public Task
{
public:
Relocate_task(const General_options& options, const Symbol_table* symtab,
const Layout* layout, Relobj* object, Output_file* of,
Task_token* final_blocker)
: options_(options), symtab_(symtab), layout_(layout), object_(object),
of_(of), final_blocker_(final_blocker)
{ }
// The standard Task methods.
Is_runnable_type
is_runnable(Workqueue*);
Task_locker*
locks(Workqueue*);
void
run(Workqueue*);
private:
class Relocate_locker;
const General_options& options_;
const Symbol_table* symtab_;
const Layout* layout_;
Relobj* object_;
Output_file* of_;
Task_token* final_blocker_;
};
// Standard relocation routines which are used on many targets. Here
// SIZE and BIG_ENDIAN refer to the target, not the relocation type.
template<int size, bool big_endian>
class Relocate_functions
{
private:
// Do a simple relocation with the addend in the section contents.
// VALSIZE is the size of the value.
template<int valsize>
static inline void
rel(unsigned char* view,
typename elfcpp::Swap<valsize, big_endian>::Valtype value)
{
typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value);
}
// Do a simple PC relative relocation with the addend in the section
// contents. VALSIZE is the size of the value.
template<int valsize>
static inline void
pcrel(unsigned char* view,
typename elfcpp::Swap<valsize, big_endian>::Valtype value,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address);
}
typedef Relocate_functions<size, big_endian> This;
public:
// Do a simple 8-bit REL relocation with the addend in the object
// file data.
static inline void
rel8(unsigned char* view, unsigned char value)
{
This::template rel<8>(view, value);
}
// Do a simple 8-bit PC relative relocation with the addend in the
// object file data.
static inline void
pcrel8(unsigned char* view, unsigned char value,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
This::template pcrel<8>(view, value, address);
}
// Do a simple 16-bit REL relocation with the addend in the object
// file data.
static inline void
rel16(unsigned char* view, elfcpp::Elf_Half value)
{
This::template rel<16>(view, value);
}
// Do a simple 32-bit PC relative REL relocation with the addend in
// the object file data.
static inline void
pcrel16(unsigned char* view, elfcpp::Elf_Word value,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
This::template pcrel<16>(view, value, 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);
}
// 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);
}
// 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);
}
// 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);
}
};
} // End namespace gold.
#endif // !defined(GOLD_RELOC_H)
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