2006-08-19 00:29:20 +02:00
|
|
|
// target.h -- target support for gold -*- C++ -*-
|
2006-08-05 01:10:59 +02:00
|
|
|
|
|
|
|
// The abstract class Target is the interface for target specific
|
|
|
|
// support. It defines abstract methods which each target must
|
|
|
|
// implement. Typically there will be one target per processor, but
|
|
|
|
// in some cases it may be necessary to have subclasses.
|
|
|
|
|
|
|
|
// For speed and consistency we want to use inline functions to handle
|
|
|
|
// relocation processing. So besides implementations of the abstract
|
|
|
|
// methods, each target is expected to define a template
|
|
|
|
// specialization of the relocation functions.
|
|
|
|
|
|
|
|
#ifndef GOLD_TARGET_H
|
|
|
|
#define GOLD_TARGET_H
|
|
|
|
|
2006-08-19 00:29:20 +02:00
|
|
|
#include "elfcpp.h"
|
|
|
|
|
2006-08-05 01:10:59 +02:00
|
|
|
namespace gold
|
|
|
|
{
|
|
|
|
|
2006-10-20 22:40:49 +02:00
|
|
|
class General_options;
|
2006-08-19 00:29:20 +02:00
|
|
|
class Object;
|
2006-09-29 21:58:17 +02:00
|
|
|
template<int size, bool big_endian>
|
2006-11-06 23:46:08 +01:00
|
|
|
class Sized_relobj;
|
2006-10-20 22:40:49 +02:00
|
|
|
template<int size, bool big_endian>
|
|
|
|
struct Relocate_info;
|
2006-11-06 23:46:08 +01:00
|
|
|
class Symbol;
|
|
|
|
template<int size>
|
|
|
|
class Sized_symbol;
|
|
|
|
class Symbol_table;
|
2006-08-19 00:29:20 +02:00
|
|
|
|
|
|
|
// The abstract class for target specific handling.
|
|
|
|
|
2006-08-05 01:10:59 +02:00
|
|
|
class Target
|
|
|
|
{
|
|
|
|
public:
|
2006-08-19 00:29:20 +02:00
|
|
|
virtual ~Target()
|
|
|
|
{ }
|
|
|
|
|
|
|
|
// Return the bit size that this target implements. This should
|
|
|
|
// return 32 or 64.
|
|
|
|
int
|
|
|
|
get_size() const
|
2006-09-28 00:53:42 +02:00
|
|
|
{ return this->pti_->size; }
|
2006-08-19 00:29:20 +02:00
|
|
|
|
|
|
|
// Return whether this target is big-endian.
|
|
|
|
bool
|
|
|
|
is_big_endian() const
|
2006-09-28 00:53:42 +02:00
|
|
|
{ return this->pti_->is_big_endian; }
|
2006-08-19 00:29:20 +02:00
|
|
|
|
2006-09-29 21:58:17 +02:00
|
|
|
// Machine code to store in e_machine field of ELF header.
|
|
|
|
elfcpp::EM
|
|
|
|
machine_code() const
|
|
|
|
{ return this->pti_->machine_code; }
|
|
|
|
|
2006-08-19 00:29:20 +02:00
|
|
|
// Whether this target has a specific make_symbol function.
|
|
|
|
bool
|
|
|
|
has_make_symbol() const
|
2006-09-28 00:53:42 +02:00
|
|
|
{ return this->pti_->has_make_symbol; }
|
2006-08-19 00:29:20 +02:00
|
|
|
|
|
|
|
// Whether this target has a specific resolve function.
|
|
|
|
bool
|
|
|
|
has_resolve() const
|
2006-09-28 00:53:42 +02:00
|
|
|
{ return this->pti_->has_resolve; }
|
|
|
|
|
2007-09-21 07:31:19 +02:00
|
|
|
// Whether this target has a specific code fill function.
|
|
|
|
bool
|
|
|
|
has_code_fill() const
|
|
|
|
{ return this->pti_->has_code_fill; }
|
|
|
|
|
2006-11-14 20:21:05 +01:00
|
|
|
// Return the default name of the dynamic linker.
|
|
|
|
const char*
|
|
|
|
dynamic_linker() const
|
|
|
|
{ return this->pti_->dynamic_linker; }
|
|
|
|
|
2006-09-28 00:53:42 +02:00
|
|
|
// Return the default address to use for the text segment.
|
|
|
|
uint64_t
|
|
|
|
text_segment_address() const
|
|
|
|
{ return this->pti_->text_segment_address; }
|
|
|
|
|
|
|
|
// Return the ABI specified page size.
|
|
|
|
uint64_t
|
|
|
|
abi_pagesize() const
|
|
|
|
{ return this->pti_->abi_pagesize; }
|
|
|
|
|
|
|
|
// Return the common page size used on actual systems.
|
|
|
|
uint64_t
|
|
|
|
common_pagesize() const
|
|
|
|
{ return this->pti_->common_pagesize; }
|
2006-08-19 00:29:20 +02:00
|
|
|
|
2006-12-01 00:52:50 +01:00
|
|
|
// This is called to tell the target to complete any sections it is
|
|
|
|
// handling. After this all sections must have their final size.
|
|
|
|
void
|
2007-09-21 09:20:01 +02:00
|
|
|
finalize_sections(Layout* layout)
|
|
|
|
{ return this->do_finalize_sections(layout); }
|
2006-12-01 00:52:50 +01:00
|
|
|
|
2007-09-21 07:31:19 +02:00
|
|
|
// Return a string to use to fill out a code section. This is
|
|
|
|
// basically one or more NOPS which must fill out the specified
|
|
|
|
// length in bytes.
|
|
|
|
std::string
|
|
|
|
code_fill(off_t length)
|
|
|
|
{ return this->do_code_fill(length); }
|
|
|
|
|
2006-08-19 00:29:20 +02:00
|
|
|
protected:
|
2006-09-28 00:53:42 +02:00
|
|
|
// This struct holds the constant information for a child class. We
|
|
|
|
// use a struct to avoid the overhead of virtual function calls for
|
|
|
|
// simple information.
|
|
|
|
struct Target_info
|
|
|
|
{
|
|
|
|
// Address size (32 or 64).
|
|
|
|
int size;
|
|
|
|
// Whether the target is big endian.
|
|
|
|
bool is_big_endian;
|
2006-09-29 21:58:17 +02:00
|
|
|
// The code to store in the e_machine field of the ELF header.
|
|
|
|
elfcpp::EM machine_code;
|
2006-09-28 00:53:42 +02:00
|
|
|
// Whether this target has a specific make_symbol function.
|
|
|
|
bool has_make_symbol;
|
|
|
|
// Whether this target has a specific resolve function.
|
|
|
|
bool has_resolve;
|
2007-09-21 07:31:19 +02:00
|
|
|
// Whether this target has a specific code fill function.
|
|
|
|
bool has_code_fill;
|
2006-11-14 20:21:05 +01:00
|
|
|
// The default dynamic linker name.
|
|
|
|
const char* dynamic_linker;
|
2006-09-28 00:53:42 +02:00
|
|
|
// The default text segment address.
|
|
|
|
uint64_t text_segment_address;
|
|
|
|
// The ABI specified page size.
|
|
|
|
uint64_t abi_pagesize;
|
|
|
|
// The common page size used by actual implementations.
|
|
|
|
uint64_t common_pagesize;
|
|
|
|
};
|
|
|
|
|
|
|
|
Target(const Target_info* pti)
|
|
|
|
: pti_(pti)
|
2006-08-19 00:29:20 +02:00
|
|
|
{ }
|
|
|
|
|
2006-12-01 00:52:50 +01:00
|
|
|
// Virtual function which may be implemented by the child class.
|
|
|
|
virtual void
|
2007-09-21 09:20:01 +02:00
|
|
|
do_finalize_sections(Layout*)
|
2006-12-01 00:52:50 +01:00
|
|
|
{ }
|
|
|
|
|
2007-09-21 07:31:19 +02:00
|
|
|
// Virtual function which must be implemented by the child class if
|
|
|
|
// needed.
|
|
|
|
virtual std::string
|
|
|
|
do_code_fill(off_t)
|
|
|
|
{ gold_unreachable(); }
|
|
|
|
|
2006-08-19 00:29:20 +02:00
|
|
|
private:
|
|
|
|
Target(const Target&);
|
|
|
|
Target& operator=(const Target&);
|
|
|
|
|
2006-09-28 00:53:42 +02:00
|
|
|
// The target information.
|
|
|
|
const Target_info* pti_;
|
2006-08-05 01:10:59 +02:00
|
|
|
};
|
|
|
|
|
2006-08-19 00:29:20 +02:00
|
|
|
// The abstract class for a specific size and endianness of target.
|
|
|
|
// Each actual target implementation class should derive from an
|
|
|
|
// instantiation of Sized_target.
|
|
|
|
|
|
|
|
template<int size, bool big_endian>
|
|
|
|
class Sized_target : public Target
|
|
|
|
{
|
|
|
|
public:
|
|
|
|
// Make a new symbol table entry for the target. This should be
|
|
|
|
// overridden by a target which needs additional information in the
|
|
|
|
// symbol table. This will only be called if has_make_symbol()
|
|
|
|
// returns true.
|
|
|
|
virtual Sized_symbol<size>*
|
2006-12-06 01:02:36 +01:00
|
|
|
make_symbol() const
|
2006-11-29 18:56:40 +01:00
|
|
|
{ gold_unreachable(); }
|
2006-08-19 00:29:20 +02:00
|
|
|
|
|
|
|
// Resolve a symbol for the target. This should be overridden by a
|
|
|
|
// target which needs to take special action. TO is the
|
|
|
|
// pre-existing symbol. SYM is the new symbol, seen in OBJECT.
|
2006-12-06 01:02:36 +01:00
|
|
|
// VERSION is the version of SYM. This will only be called if
|
|
|
|
// has_resolve() returns true.
|
2006-08-19 00:29:20 +02:00
|
|
|
virtual void
|
2006-12-06 01:02:36 +01:00
|
|
|
resolve(Symbol*, const elfcpp::Sym<size, big_endian>&, Object*,
|
|
|
|
const char*)
|
2006-11-29 18:56:40 +01:00
|
|
|
{ gold_unreachable(); }
|
2006-08-19 00:29:20 +02:00
|
|
|
|
2006-10-20 22:40:49 +02:00
|
|
|
// Scan the relocs for a section, and record any information
|
|
|
|
// required for the symbol. OPTIONS is the command line options.
|
|
|
|
// SYMTAB is the symbol table. OBJECT is the object in which the
|
2006-11-29 18:56:40 +01:00
|
|
|
// section appears. DATA_SHNDX is the section index that these
|
|
|
|
// relocs apply to. SH_TYPE is the type of the relocation section,
|
2006-10-20 22:40:49 +02:00
|
|
|
// SHT_REL or SHT_RELA. PRELOCS points to the relocation data.
|
|
|
|
// RELOC_COUNT is the number of relocs. LOCAL_SYMBOL_COUNT is the
|
|
|
|
// number of local symbols. PLOCAL_SYMBOLS points to the local
|
|
|
|
// symbol data from OBJECT. GLOBAL_SYMBOLS is the array of pointers
|
|
|
|
// to the global symbol table from OBJECT.
|
2006-09-29 21:58:17 +02:00
|
|
|
virtual void
|
2006-10-20 22:40:49 +02:00
|
|
|
scan_relocs(const General_options& options,
|
|
|
|
Symbol_table* symtab,
|
2006-11-03 19:26:11 +01:00
|
|
|
Layout* layout,
|
2006-11-06 23:46:08 +01:00
|
|
|
Sized_relobj<size, big_endian>* object,
|
2006-11-29 18:56:40 +01:00
|
|
|
unsigned int data_shndx,
|
2006-10-20 22:40:49 +02:00
|
|
|
unsigned int sh_type,
|
|
|
|
const unsigned char* prelocs,
|
|
|
|
size_t reloc_count,
|
|
|
|
size_t local_symbol_count,
|
|
|
|
const unsigned char* plocal_symbols,
|
|
|
|
Symbol** global_symbols) = 0;
|
|
|
|
|
|
|
|
// Relocate section data. SH_TYPE is the type of the relocation
|
|
|
|
// section, SHT_REL or SHT_RELA. PRELOCS points to the relocation
|
|
|
|
// information. RELOC_COUNT is the number of relocs. VIEW is a
|
|
|
|
// view into the output file holding the section contents,
|
|
|
|
// VIEW_ADDRESS is the virtual address of the view, and VIEW_SIZE is
|
|
|
|
// the size of the view.
|
|
|
|
virtual void
|
|
|
|
relocate_section(const Relocate_info<size, big_endian>*,
|
|
|
|
unsigned int sh_type,
|
|
|
|
const unsigned char* prelocs,
|
|
|
|
size_t reloc_count,
|
|
|
|
unsigned char* view,
|
|
|
|
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
|
|
|
|
off_t view_size) = 0;
|
2006-09-29 21:58:17 +02:00
|
|
|
|
2006-08-19 00:29:20 +02:00
|
|
|
protected:
|
2006-09-28 00:53:42 +02:00
|
|
|
Sized_target(const Target::Target_info* pti)
|
|
|
|
: Target(pti)
|
|
|
|
{
|
2006-11-29 18:56:40 +01:00
|
|
|
gold_assert(pti->size == size);
|
|
|
|
gold_assert(pti->is_big_endian ? big_endian : !big_endian);
|
2006-09-28 00:53:42 +02:00
|
|
|
}
|
2006-08-19 00:29:20 +02:00
|
|
|
};
|
2006-08-05 01:10:59 +02:00
|
|
|
|
|
|
|
} // End namespace gold.
|
|
|
|
|
|
|
|
#endif // !defined(GOLD_TARGET_H)
|