// target.cc
|
// target.cc
|
|
|
// Copyright 2009 Free Software Foundation, Inc.
|
// Copyright 2009 Free Software Foundation, Inc.
|
// Written by Doug Kwan <dougkwan@google.com>.
|
// Written by Doug Kwan <dougkwan@google.com>.
|
|
|
// This file is part of gold.
|
// This file is part of gold.
|
|
|
// This program is free software; you can redistribute it and/or modify
|
// This program is free software; you can redistribute it and/or modify
|
// it under the terms of the GNU General Public License as published by
|
// it under the terms of the GNU General Public License as published by
|
// the Free Software Foundation; either version 3 of the License, or
|
// the Free Software Foundation; either version 3 of the License, or
|
// (at your option) any later version.
|
// (at your option) any later version.
|
|
|
// This program is distributed in the hope that it will be useful,
|
// This program is distributed in the hope that it will be useful,
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
// GNU General Public License for more details.
|
// GNU General Public License for more details.
|
|
|
// You should have received a copy of the GNU General Public License
|
// You should have received a copy of the GNU General Public License
|
// along with this program; if not, write to the Free Software
|
// along with this program; if not, write to the Free Software
|
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
// MA 02110-1301, USA.
|
// MA 02110-1301, USA.
|
|
|
#include "gold.h"
|
#include "gold.h"
|
#include "target.h"
|
#include "target.h"
|
#include "dynobj.h"
|
#include "dynobj.h"
|
#include "output.h"
|
#include "output.h"
|
#include "elfcpp.h"
|
#include "elfcpp.h"
|
|
|
namespace gold
|
namespace gold
|
{
|
{
|
|
|
// Return whether NAME is a local label name. This is used to implement the
|
// Return whether NAME is a local label name. This is used to implement the
|
// --discard-locals options and can be overriden by children classes to
|
// --discard-locals options and can be overriden by children classes to
|
// implement system-specific behaviour. The logic here is the same as that
|
// implement system-specific behaviour. The logic here is the same as that
|
// in _bfd_elf_is_local_label_name().
|
// in _bfd_elf_is_local_label_name().
|
|
|
bool
|
bool
|
Target::do_is_local_label_name (const char* name) const
|
Target::do_is_local_label_name (const char* name) const
|
{
|
{
|
// Normal local symbols start with ``.L''.
|
// Normal local symbols start with ``.L''.
|
if (name[0] == '.' && name[1] == 'L')
|
if (name[0] == '.' && name[1] == 'L')
|
return true;
|
return true;
|
|
|
// At least some SVR4 compilers (e.g., UnixWare 2.1 cc) generate
|
// At least some SVR4 compilers (e.g., UnixWare 2.1 cc) generate
|
// DWARF debugging symbols starting with ``..''.
|
// DWARF debugging symbols starting with ``..''.
|
if (name[0] == '.' && name[1] == '.')
|
if (name[0] == '.' && name[1] == '.')
|
return true;
|
return true;
|
|
|
// gcc will sometimes generate symbols beginning with ``_.L_'' when
|
// gcc will sometimes generate symbols beginning with ``_.L_'' when
|
// emitting DWARF debugging output. I suspect this is actually a
|
// emitting DWARF debugging output. I suspect this is actually a
|
// small bug in gcc (it calls ASM_OUTPUT_LABEL when it should call
|
// small bug in gcc (it calls ASM_OUTPUT_LABEL when it should call
|
// ASM_GENERATE_INTERNAL_LABEL, and this causes the leading
|
// ASM_GENERATE_INTERNAL_LABEL, and this causes the leading
|
// underscore to be emitted on some ELF targets). For ease of use,
|
// underscore to be emitted on some ELF targets). For ease of use,
|
// we treat such symbols as local.
|
// we treat such symbols as local.
|
if (name[0] == '_' && name[1] == '.' && name[2] == 'L' && name[3] == '_')
|
if (name[0] == '_' && name[1] == '.' && name[2] == 'L' && name[3] == '_')
|
return true;
|
return true;
|
|
|
return false;
|
return false;
|
}
|
}
|
|
|
// Implementations of methods Target::do_make_elf_object are almost identical
|
// Implementations of methods Target::do_make_elf_object are almost identical
|
// except for the address sizes and endianities. So we extract this
|
// except for the address sizes and endianities. So we extract this
|
// into a template.
|
// into a template.
|
|
|
template<int size, bool big_endian>
|
template<int size, bool big_endian>
|
inline Object*
|
inline Object*
|
Target::do_make_elf_object_implementation(
|
Target::do_make_elf_object_implementation(
|
const std::string& name,
|
const std::string& name,
|
Input_file* input_file,
|
Input_file* input_file,
|
off_t offset,
|
off_t offset,
|
const elfcpp::Ehdr<size, big_endian>& ehdr)
|
const elfcpp::Ehdr<size, big_endian>& ehdr)
|
{
|
{
|
int et = ehdr.get_e_type();
|
int et = ehdr.get_e_type();
|
if (et == elfcpp::ET_REL)
|
if (et == elfcpp::ET_REL)
|
{
|
{
|
Sized_relobj<size, big_endian>* obj =
|
Sized_relobj<size, big_endian>* obj =
|
new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr);
|
new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr);
|
obj->setup();
|
obj->setup();
|
return obj;
|
return obj;
|
}
|
}
|
else if (et == elfcpp::ET_DYN)
|
else if (et == elfcpp::ET_DYN)
|
{
|
{
|
Sized_dynobj<size, big_endian>* obj =
|
Sized_dynobj<size, big_endian>* obj =
|
new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
|
new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
|
obj->setup();
|
obj->setup();
|
return obj;
|
return obj;
|
}
|
}
|
else
|
else
|
{
|
{
|
gold_error(_("%s: unsupported ELF file type %d"),
|
gold_error(_("%s: unsupported ELF file type %d"),
|
name.c_str(), et);
|
name.c_str(), et);
|
return NULL;
|
return NULL;
|
}
|
}
|
}
|
}
|
|
|
// Make an ELF object called NAME by reading INPUT_FILE at OFFSET. EHDR
|
// Make an ELF object called NAME by reading INPUT_FILE at OFFSET. EHDR
|
// is the ELF header of the object. There are four versions of this
|
// is the ELF header of the object. There are four versions of this
|
// for different address sizes and endianities.
|
// for different address sizes and endianities.
|
|
|
#ifdef HAVE_TARGET_32_LITTLE
|
#ifdef HAVE_TARGET_32_LITTLE
|
Object*
|
Object*
|
Target::do_make_elf_object(const std::string& name, Input_file* input_file,
|
Target::do_make_elf_object(const std::string& name, Input_file* input_file,
|
off_t offset, const elfcpp::Ehdr<32, false>& ehdr)
|
off_t offset, const elfcpp::Ehdr<32, false>& ehdr)
|
{
|
{
|
return this->do_make_elf_object_implementation<32, false>(name, input_file,
|
return this->do_make_elf_object_implementation<32, false>(name, input_file,
|
offset, ehdr);
|
offset, ehdr);
|
}
|
}
|
#endif
|
#endif
|
|
|
#ifdef HAVE_TARGET_32_BIG
|
#ifdef HAVE_TARGET_32_BIG
|
Object*
|
Object*
|
Target::do_make_elf_object(const std::string& name, Input_file* input_file,
|
Target::do_make_elf_object(const std::string& name, Input_file* input_file,
|
off_t offset, const elfcpp::Ehdr<32, true>& ehdr)
|
off_t offset, const elfcpp::Ehdr<32, true>& ehdr)
|
{
|
{
|
return this->do_make_elf_object_implementation<32, true>(name, input_file,
|
return this->do_make_elf_object_implementation<32, true>(name, input_file,
|
offset, ehdr);
|
offset, ehdr);
|
}
|
}
|
#endif
|
#endif
|
|
|
#ifdef HAVE_TARGET_64_LITTLE
|
#ifdef HAVE_TARGET_64_LITTLE
|
Object*
|
Object*
|
Target::do_make_elf_object(const std::string& name, Input_file* input_file,
|
Target::do_make_elf_object(const std::string& name, Input_file* input_file,
|
off_t offset, const elfcpp::Ehdr<64, false>& ehdr)
|
off_t offset, const elfcpp::Ehdr<64, false>& ehdr)
|
{
|
{
|
return this->do_make_elf_object_implementation<64, false>(name, input_file,
|
return this->do_make_elf_object_implementation<64, false>(name, input_file,
|
offset, ehdr);
|
offset, ehdr);
|
}
|
}
|
#endif
|
#endif
|
|
|
#ifdef HAVE_TARGET_64_BIG
|
#ifdef HAVE_TARGET_64_BIG
|
Object*
|
Object*
|
Target::do_make_elf_object(const std::string& name, Input_file* input_file,
|
Target::do_make_elf_object(const std::string& name, Input_file* input_file,
|
off_t offset, const elfcpp::Ehdr<64, true>& ehdr)
|
off_t offset, const elfcpp::Ehdr<64, true>& ehdr)
|
{
|
{
|
return this->do_make_elf_object_implementation<64, true>(name, input_file,
|
return this->do_make_elf_object_implementation<64, true>(name, input_file,
|
offset, ehdr);
|
offset, ehdr);
|
}
|
}
|
#endif
|
#endif
|
|
|
Output_section*
|
Output_section*
|
Target::do_make_output_section(const char* name, elfcpp::Elf_Word type,
|
Target::do_make_output_section(const char* name, elfcpp::Elf_Word type,
|
elfcpp::Elf_Xword flags)
|
elfcpp::Elf_Xword flags)
|
{
|
{
|
return new Output_section(name, type, flags);
|
return new Output_section(name, type, flags);
|
}
|
}
|
|
|
// Default conversion for -fsplit-stack is to give an error.
|
// Default conversion for -fsplit-stack is to give an error.
|
|
|
void
|
void
|
Target::do_calls_non_split(Relobj* object, unsigned int, section_offset_type,
|
Target::do_calls_non_split(Relobj* object, unsigned int, section_offset_type,
|
section_size_type, unsigned char*, section_size_type,
|
section_size_type, unsigned char*, section_size_type,
|
std::string*, std::string*) const
|
std::string*, std::string*) const
|
{
|
{
|
static bool warned;
|
static bool warned;
|
if (!warned)
|
if (!warned)
|
{
|
{
|
gold_error(_("linker does not include stack split support "
|
gold_error(_("linker does not include stack split support "
|
"required by %s"),
|
"required by %s"),
|
object->name().c_str());
|
object->name().c_str());
|
warned = true;
|
warned = true;
|
}
|
}
|
}
|
}
|
|
|
// Return whether BYTES/LEN matches VIEW/VIEW_SIZE at OFFSET.
|
// Return whether BYTES/LEN matches VIEW/VIEW_SIZE at OFFSET.
|
|
|
bool
|
bool
|
Target::match_view(const unsigned char* view, section_size_type view_size,
|
Target::match_view(const unsigned char* view, section_size_type view_size,
|
section_offset_type offset, const char* bytes,
|
section_offset_type offset, const char* bytes,
|
size_t len) const
|
size_t len) const
|
{
|
{
|
if (offset + len > view_size)
|
if (offset + len > view_size)
|
return false;
|
return false;
|
return memcmp(view + offset, bytes, len) == 0;
|
return memcmp(view + offset, bytes, len) == 0;
|
}
|
}
|
|
|
// Set the contents of a VIEW/VIEW_SIZE to nops starting at OFFSET
|
// Set the contents of a VIEW/VIEW_SIZE to nops starting at OFFSET
|
// for LEN bytes.
|
// for LEN bytes.
|
|
|
void
|
void
|
Target::set_view_to_nop(unsigned char* view, section_size_type view_size,
|
Target::set_view_to_nop(unsigned char* view, section_size_type view_size,
|
section_offset_type offset, size_t len) const
|
section_offset_type offset, size_t len) const
|
{
|
{
|
gold_assert(offset >= 0 && offset + len <= view_size);
|
gold_assert(offset >= 0 && offset + len <= view_size);
|
if (!this->has_code_fill())
|
if (!this->has_code_fill())
|
memset(view + offset, 0, len);
|
memset(view + offset, 0, len);
|
else
|
else
|
{
|
{
|
std::string fill = this->code_fill(len);
|
std::string fill = this->code_fill(len);
|
memcpy(view + offset, fill.data(), len);
|
memcpy(view + offset, fill.data(), len);
|
}
|
}
|
}
|
}
|
|
|
} // End namespace gold.
|
} // End namespace gold.
|
|
|
