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235 lines
6.1 KiB
C++
235 lines
6.1 KiB
C++
// reloc.h -- relocate input files for gold -*- C++ -*-
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#ifndef GOLD_RELOC_H
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#define GOLD_RELOC_H
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#include <byteswap.h>
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#include "workqueue.h"
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namespace gold
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{
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class Relobj;
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class Read_relocs_data;
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class Stringpool;
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class Layout;
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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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Is_runnable_type
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is_runnable(Workqueue*);
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Task_locker*
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locks(Workqueue*);
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void
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run(Workqueue*);
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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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// 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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Is_runnable_type
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is_runnable(Workqueue*);
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Task_locker*
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locks(Workqueue*);
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void
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run(Workqueue*);
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private:
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class Scan_relocs_locker;
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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* final_blocker)
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: options_(options), symtab_(symtab), layout_(layout), object_(object),
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of_(of), final_blocker_(final_blocker)
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{ }
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// The standard Task methods.
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Is_runnable_type
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is_runnable(Workqueue*);
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Task_locker*
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locks(Workqueue*);
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void
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run(Workqueue*);
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private:
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class Relocate_locker;
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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* final_blocker_;
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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 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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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 object
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// file data.
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static inline void
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rel8(unsigned char* view, unsigned char value)
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{
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This::template rel<8>(view, value);
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}
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// Do a simple 8-bit PC relative relocation with the addend in the
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// object file data.
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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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{
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This::template pcrel<8>(view, value, address);
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}
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// Do a simple 16-bit REL relocation with the addend in the object
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// file data.
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static inline void
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rel16(unsigned char* view, elfcpp::Elf_Half value)
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{
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This::template rel<16>(view, value);
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}
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// Do a simple 32-bit PC relative REL relocation with the addend in
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// the object file data.
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static inline void
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pcrel16(unsigned char* view, elfcpp::Elf_Word value,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{
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This::template pcrel<16>(view, value, address);
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}
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// Do a simple 32-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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rel32(unsigned char* view, elfcpp::Elf_Word value)
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{
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This::template rel<32>(view, value);
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}
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// Do a simple 32-bit PC relative REL relocation with the addend in
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// the section contents.
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static inline void
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pcrel32(unsigned char* view, elfcpp::Elf_Word value,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{
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This::template pcrel<32>(view, value, address);
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}
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// Do a simple 64-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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rel64(unsigned char* view, elfcpp::Elf_Xword value)
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{
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This::template rel<64>(view, value);
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}
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// Do a simple 64-bit PC relative REL relocation with the addend in
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// the section contents.
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static inline void
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pcrel64(unsigned char* view, elfcpp::Elf_Xword value,
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typename elfcpp::Elf_types<size>::Elf_Addr address)
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{
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This::template pcrel<64>(view, value, address);
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}
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};
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} // End namespace gold.
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#endif // !defined(GOLD_RELOC_H)
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