blob: 6b12ed8869b928da5cba4cda85c9f679221dbc19 [file] [log] [blame]
// powerpc.cc -- powerpc target support for gold.
// Copyright (C) 2008-2021 Free Software Foundation, Inc.
// Written by David S. Miller <davem@davemloft.net>
// and David Edelsohn <edelsohn@gnu.org>
// This file is part of gold.
// 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
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
#include "gold.h"
#include <set>
#include <algorithm>
#include "elfcpp.h"
#include "dwarf.h"
#include "parameters.h"
#include "reloc.h"
#include "powerpc.h"
#include "object.h"
#include "symtab.h"
#include "layout.h"
#include "output.h"
#include "copy-relocs.h"
#include "target.h"
#include "target-reloc.h"
#include "target-select.h"
#include "tls.h"
#include "errors.h"
#include "gc.h"
#include "attributes.h"
namespace
{
using namespace gold;
template<int size, bool big_endian>
class Output_data_plt_powerpc;
template<int size, bool big_endian>
class Output_data_brlt_powerpc;
template<int size, bool big_endian>
class Output_data_got_powerpc;
template<int size, bool big_endian>
class Output_data_glink;
template<int size, bool big_endian>
class Stub_table;
template<int size, bool big_endian>
class Output_data_save_res;
template<int size, bool big_endian>
class Target_powerpc;
struct Stub_table_owner
{
Stub_table_owner()
: output_section(NULL), owner(NULL)
{ }
Output_section* output_section;
const Output_section::Input_section* owner;
};
template<int size>
inline bool is_branch_reloc(unsigned int);
template<int size>
inline bool is_plt16_reloc(unsigned int);
// Counter incremented on every Powerpc_relobj constructed.
static uint32_t object_id = 0;
template<int size, bool big_endian>
class Powerpc_relobj : public Sized_relobj_file<size, big_endian>
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
typedef Unordered_set<Section_id, Section_id_hash> Section_refs;
typedef Unordered_map<Address, Section_refs> Access_from;
Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset,
const typename elfcpp::Ehdr<size, big_endian>& ehdr)
: Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr),
uniq_(object_id++), special_(0), relatoc_(0), toc_(0),
has_small_toc_reloc_(false), opd_valid_(false),
no_tls_marker_(false), tls_marker_(false), tls_opt_error_(false),
e_flags_(ehdr.get_e_flags()), no_toc_opt_(), opd_ent_(),
access_from_map_(), has14_(), stub_table_index_(), st_other_(),
attributes_section_data_(NULL)
{
this->set_abiversion(0);
}
~Powerpc_relobj()
{ delete this->attributes_section_data_; }
// Read the symbols then set up st_other vector.
void
do_read_symbols(Read_symbols_data*);
// Arrange to always relocate .toc first.
virtual void
do_relocate_sections(
const Symbol_table* symtab, const Layout* layout,
const unsigned char* pshdrs, Output_file* of,
typename Sized_relobj_file<size, big_endian>::Views* pviews);
// The .toc section index.
unsigned int
toc_shndx() const
{
return this->toc_;
}
// Mark .toc entry at OFF as not optimizable.
void
set_no_toc_opt(Address off)
{
if (this->no_toc_opt_.empty())
this->no_toc_opt_.resize(this->section_size(this->toc_shndx())
/ (size / 8));
off /= size / 8;
if (off < this->no_toc_opt_.size())
this->no_toc_opt_[off] = true;
}
// Mark the entire .toc as not optimizable.
void
set_no_toc_opt()
{
this->no_toc_opt_.resize(1);
this->no_toc_opt_[0] = true;
}
// Return true if code using the .toc entry at OFF should not be edited.
bool
no_toc_opt(Address off) const
{
if (this->no_toc_opt_.empty())
return false;
off /= size / 8;
if (off >= this->no_toc_opt_.size())
return true;
return this->no_toc_opt_[off];
}
void
set_no_tls_marker()
{
if (!this->no_tls_marker_ && this->tls_marker_)
this->tls_opt_error_ = true;
this->no_tls_marker_ = true;
}
bool
no_tls_marker() const
{ return this->no_tls_marker_; }
void
set_tls_marker()
{ this->tls_marker_ = true; }
bool
tls_marker() const
{ return this->tls_marker_; }
bool
tls_opt_error() const
{ return this->tls_opt_error_; }
// The .got2 section shndx.
unsigned int
got2_shndx() const
{
if (size == 32)
return this->special_;
else
return 0;
}
// The .opd section shndx.
unsigned int
opd_shndx() const
{
if (size == 32)
return 0;
else
return this->special_;
}
// Init OPD entry arrays.
void
init_opd(size_t opd_size)
{
size_t count = this->opd_ent_ndx(opd_size);
this->opd_ent_.resize(count);
}
// Return section and offset of function entry for .opd + R_OFF.
unsigned int
get_opd_ent(Address r_off, Address* value = NULL) const
{
size_t ndx = this->opd_ent_ndx(r_off);
gold_assert(ndx < this->opd_ent_.size());
gold_assert(this->opd_ent_[ndx].shndx != 0);
if (value != NULL)
*value = this->opd_ent_[ndx].off;
return this->opd_ent_[ndx].shndx;
}
// Set section and offset of function entry for .opd + R_OFF.
void
set_opd_ent(Address r_off, unsigned int shndx, Address value)
{
size_t ndx = this->opd_ent_ndx(r_off);
gold_assert(ndx < this->opd_ent_.size());
this->opd_ent_[ndx].shndx = shndx;
this->opd_ent_[ndx].off = value;
}
// Return discard flag for .opd + R_OFF.
bool
get_opd_discard(Address r_off) const
{
size_t ndx = this->opd_ent_ndx(r_off);
gold_assert(ndx < this->opd_ent_.size());
return this->opd_ent_[ndx].discard;
}
// Set discard flag for .opd + R_OFF.
void
set_opd_discard(Address r_off)
{
size_t ndx = this->opd_ent_ndx(r_off);
gold_assert(ndx < this->opd_ent_.size());
this->opd_ent_[ndx].discard = true;
}
bool
opd_valid() const
{ return this->opd_valid_; }
void
set_opd_valid()
{ this->opd_valid_ = true; }
// Examine .rela.opd to build info about function entry points.
void
scan_opd_relocs(size_t reloc_count,
const unsigned char* prelocs,
const unsigned char* plocal_syms);
// Returns true if a code sequence loading a TOC entry can be
// converted into code calculating a TOC pointer relative offset.
bool
make_toc_relative(Target_powerpc<size, big_endian>* target,
Address* value);
bool
make_got_relative(Target_powerpc<size, big_endian>* target,
const Symbol_value<size>* psymval,
Address addend,
Address* value);
// Perform the Sized_relobj_file method, then set up opd info from
// .opd relocs.
void
do_read_relocs(Read_relocs_data*);
bool
do_find_special_sections(Read_symbols_data* sd);
// Adjust this local symbol value. Return false if the symbol
// should be discarded from the output file.
bool
do_adjust_local_symbol(Symbol_value<size>* lv) const
{
if (size == 64 && this->opd_shndx() != 0)
{
bool is_ordinary;
if (lv->input_shndx(&is_ordinary) != this->opd_shndx())
return true;
if (this->get_opd_discard(lv->input_value()))
return false;
}
return true;
}
Access_from*
access_from_map()
{ return &this->access_from_map_; }
// Add a reference from SRC_OBJ, SRC_INDX to this object's .opd
// section at DST_OFF.
void
add_reference(Relobj* src_obj,
unsigned int src_indx,
typename elfcpp::Elf_types<size>::Elf_Addr dst_off)
{
Section_id src_id(src_obj, src_indx);
this->access_from_map_[dst_off].insert(src_id);
}
// Add a reference to the code section specified by the .opd entry
// at DST_OFF
void
add_gc_mark(typename elfcpp::Elf_types<size>::Elf_Addr dst_off)
{
size_t ndx = this->opd_ent_ndx(dst_off);
if (ndx >= this->opd_ent_.size())
this->opd_ent_.resize(ndx + 1);
this->opd_ent_[ndx].gc_mark = true;
}
void
process_gc_mark(Symbol_table* symtab)
{
for (size_t i = 0; i < this->opd_ent_.size(); i++)
if (this->opd_ent_[i].gc_mark)
{
unsigned int shndx = this->opd_ent_[i].shndx;
symtab->gc()->worklist().push_back(Section_id(this, shndx));
}
}
// Return offset in output GOT section that this object will use
// as a TOC pointer. Won't be just a constant with multi-toc support.
Address
toc_base_offset() const
{ return 0x8000; }
void
set_has_small_toc_reloc()
{ has_small_toc_reloc_ = true; }
bool
has_small_toc_reloc() const
{ return has_small_toc_reloc_; }
void
set_has_14bit_branch(unsigned int shndx)
{
if (shndx >= this->has14_.size())
this->has14_.resize(shndx + 1);
this->has14_[shndx] = true;
}
bool
has_14bit_branch(unsigned int shndx) const
{ return shndx < this->has14_.size() && this->has14_[shndx]; }
void
set_stub_table(unsigned int shndx, unsigned int stub_index)
{
if (shndx >= this->stub_table_index_.size())
this->stub_table_index_.resize(shndx + 1, -1);
this->stub_table_index_[shndx] = stub_index;
}
Stub_table<size, big_endian>*
stub_table(unsigned int shndx)
{
if (shndx < this->stub_table_index_.size())
{
Target_powerpc<size, big_endian>* target
= static_cast<Target_powerpc<size, big_endian>*>(
parameters->sized_target<size, big_endian>());
unsigned int indx = this->stub_table_index_[shndx];
if (indx < target->stub_tables().size())
return target->stub_tables()[indx];
}
return NULL;
}
void
clear_stub_table()
{
this->stub_table_index_.clear();
}
uint32_t
uniq() const
{ return this->uniq_; }
int
abiversion() const
{ return this->e_flags_ & elfcpp::EF_PPC64_ABI; }
// Set ABI version for input and output
void
set_abiversion(int ver);
unsigned int
st_other (unsigned int symndx) const
{
return this->st_other_[symndx];
}
unsigned int
ppc64_local_entry_offset(const Symbol* sym) const
{ return elfcpp::ppc64_decode_local_entry(sym->nonvis() >> 3); }
unsigned int
ppc64_local_entry_offset(unsigned int symndx) const
{ return elfcpp::ppc64_decode_local_entry(this->st_other_[symndx] >> 5); }
bool
ppc64_needs_toc(const Symbol* sym) const
{ return sym->nonvis() > 1 << 3; }
bool
ppc64_needs_toc(unsigned int symndx) const
{ return this->st_other_[symndx] > 1 << 5; }
// The contents of the .gnu.attributes section if there is one.
const Attributes_section_data*
attributes_section_data() const
{ return this->attributes_section_data_; }
private:
struct Opd_ent
{
unsigned int shndx;
bool discard : 1;
bool gc_mark : 1;
Address off;
};
// Return index into opd_ent_ array for .opd entry at OFF.
// .opd entries are 24 bytes long, but they can be spaced 16 bytes
// apart when the language doesn't use the last 8-byte word, the
// environment pointer. Thus dividing the entry section offset by
// 16 will give an index into opd_ent_ that works for either layout
// of .opd. (It leaves some elements of the vector unused when .opd
// entries are spaced 24 bytes apart, but we don't know the spacing
// until relocations are processed, and in any case it is possible
// for an object to have some entries spaced 16 bytes apart and
// others 24 bytes apart.)
size_t
opd_ent_ndx(size_t off) const
{ return off >> 4;}
// Per object unique identifier
uint32_t uniq_;
// For 32-bit the .got2 section shdnx, for 64-bit the .opd section shndx.
unsigned int special_;
// For 64-bit the .rela.toc and .toc section shdnx.
unsigned int relatoc_;
unsigned int toc_;
// For 64-bit, whether this object uses small model relocs to access
// the toc.
bool has_small_toc_reloc_;
// Set at the start of gc_process_relocs, when we know opd_ent_
// vector is valid. The flag could be made atomic and set in
// do_read_relocs with memory_order_release and then tested with
// memory_order_acquire, potentially resulting in fewer entries in
// access_from_map_.
bool opd_valid_;
// Set when finding a __tls_get_addr call without marker relocs.
// Such a call disables GD and LD tls optimisations for the object file.
bool no_tls_marker_;
// Set when finding a __tls_get_addr call with marker relocs, or
// when finding a relocation that needs __tls_get_addr calls with
// marker relocs.
bool tls_marker_;
// Set when seeing a __tls_get_addr call without marker relocs after
// seeing some __tls_get_addr calls with marker relocs.
bool tls_opt_error_;
// Header e_flags
elfcpp::Elf_Word e_flags_;
// For 64-bit, an array with one entry per 64-bit word in the .toc
// section, set if accesses using that word cannot be optimised.
std::vector<bool> no_toc_opt_;
// The first 8-byte word of an OPD entry gives the address of the
// entry point of the function. Relocatable object files have a
// relocation on this word. The following vector records the
// section and offset specified by these relocations.
std::vector<Opd_ent> opd_ent_;
// References made to this object's .opd section when running
// gc_process_relocs for another object, before the opd_ent_ vector
// is valid for this object.
Access_from access_from_map_;
// Whether input section has a 14-bit branch reloc.
std::vector<bool> has14_;
// The stub table to use for a given input section.
std::vector<unsigned int> stub_table_index_;
// ELF st_other field for local symbols.
std::vector<unsigned char> st_other_;
// Object attributes if there is a .gnu.attributes section.
Attributes_section_data* attributes_section_data_;
};
template<int size, bool big_endian>
class Powerpc_dynobj : public Sized_dynobj<size, big_endian>
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
Powerpc_dynobj(const std::string& name, Input_file* input_file, off_t offset,
const typename elfcpp::Ehdr<size, big_endian>& ehdr)
: Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr),
opd_shndx_(0), e_flags_(ehdr.get_e_flags()), opd_ent_(),
attributes_section_data_(NULL)
{
this->set_abiversion(0);
}
~Powerpc_dynobj()
{ delete this->attributes_section_data_; }
// Call Sized_dynobj::do_read_symbols to read the symbols then
// read .opd from a dynamic object, filling in opd_ent_ vector,
void
do_read_symbols(Read_symbols_data*);
// The .opd section shndx.
unsigned int
opd_shndx() const
{
return this->opd_shndx_;
}
// The .opd section address.
Address
opd_address() const
{
return this->opd_address_;
}
// Init OPD entry arrays.
void
init_opd(size_t opd_size)
{
size_t count = this->opd_ent_ndx(opd_size);
this->opd_ent_.resize(count);
}
// Return section and offset of function entry for .opd + R_OFF.
unsigned int
get_opd_ent(Address r_off, Address* value = NULL) const
{
size_t ndx = this->opd_ent_ndx(r_off);
gold_assert(ndx < this->opd_ent_.size());
gold_assert(this->opd_ent_[ndx].shndx != 0);
if (value != NULL)
*value = this->opd_ent_[ndx].off;
return this->opd_ent_[ndx].shndx;
}
// Set section and offset of function entry for .opd + R_OFF.
void
set_opd_ent(Address r_off, unsigned int shndx, Address value)
{
size_t ndx = this->opd_ent_ndx(r_off);
gold_assert(ndx < this->opd_ent_.size());
this->opd_ent_[ndx].shndx = shndx;
this->opd_ent_[ndx].off = value;
}
int
abiversion() const
{ return this->e_flags_ & elfcpp::EF_PPC64_ABI; }
// Set ABI version for input and output.
void
set_abiversion(int ver);
// The contents of the .gnu.attributes section if there is one.
const Attributes_section_data*
attributes_section_data() const
{ return this->attributes_section_data_; }
private:
// Used to specify extent of executable sections.
struct Sec_info
{
Sec_info(Address start_, Address len_, unsigned int shndx_)
: start(start_), len(len_), shndx(shndx_)
{ }
bool
operator<(const Sec_info& that) const
{ return this->start < that.start; }
Address start;
Address len;
unsigned int shndx;
};
struct Opd_ent
{
unsigned int shndx;
Address off;
};
// Return index into opd_ent_ array for .opd entry at OFF.
size_t
opd_ent_ndx(size_t off) const
{ return off >> 4;}
// For 64-bit the .opd section shndx and address.
unsigned int opd_shndx_;
Address opd_address_;
// Header e_flags
elfcpp::Elf_Word e_flags_;
// The first 8-byte word of an OPD entry gives the address of the
// entry point of the function. Records the section and offset
// corresponding to the address. Note that in dynamic objects,
// offset is *not* relative to the section.
std::vector<Opd_ent> opd_ent_;
// Object attributes if there is a .gnu.attributes section.
Attributes_section_data* attributes_section_data_;
};
// Powerpc_copy_relocs class. Needed to peek at dynamic relocs the
// base class will emit.
template<int sh_type, int size, bool big_endian>
class Powerpc_copy_relocs : public Copy_relocs<sh_type, size, big_endian>
{
public:
Powerpc_copy_relocs()
: Copy_relocs<sh_type, size, big_endian>(elfcpp::R_POWERPC_COPY)
{ }
// Emit any saved relocations which turn out to be needed. This is
// called after all the relocs have been scanned.
void
emit(Output_data_reloc<sh_type, true, size, big_endian>*);
};
template<int size, bool big_endian>
class Target_powerpc : public Sized_target<size, big_endian>
{
public:
typedef
Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section;
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
typedef typename elfcpp::Elf_types<size>::Elf_Swxword Signed_address;
typedef Unordered_set<Symbol_location, Symbol_location_hash> Tocsave_loc;
static const Address invalid_address = static_cast<Address>(0) - 1;
// Offset of tp and dtp pointers from start of TLS block.
static const Address tp_offset = 0x7000;
static const Address dtp_offset = 0x8000;
Target_powerpc()
: Sized_target<size, big_endian>(&powerpc_info),
got_(NULL), plt_(NULL), iplt_(NULL), lplt_(NULL), brlt_section_(NULL),
glink_(NULL), rela_dyn_(NULL), copy_relocs_(),
tlsld_got_offset_(-1U),
stub_tables_(), branch_lookup_table_(), branch_info_(), tocsave_loc_(),
power10_relocs_(false), plt_thread_safe_(false), plt_localentry0_(false),
plt_localentry0_init_(false), has_localentry0_(false),
has_tls_get_addr_opt_(false), no_tprel_opt_(false),
relax_failed_(false), relax_fail_count_(0),
stub_group_size_(0), savres_section_(0),
tls_get_addr_(NULL), tls_get_addr_opt_(NULL),
attributes_section_data_(NULL),
last_fp_(NULL), last_ld_(NULL), last_vec_(NULL), last_struct_(NULL)
{
}
// Process the relocations to determine unreferenced sections for
// garbage collection.
void
gc_process_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols);
// Scan the relocations to look for symbol adjustments.
void
scan_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols);
// Map input .toc section to output .got section.
const char*
do_output_section_name(const Relobj*, const char* name, size_t* plen) const
{
if (size == 64 && strcmp(name, ".toc") == 0)
{
*plen = 4;
return ".got";
}
return NULL;
}
// Provide linker defined save/restore functions.
void
define_save_restore_funcs(Layout*, Symbol_table*);
// No stubs unless a final link.
bool
do_may_relax() const
{ return !parameters->options().relocatable(); }
bool
do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*);
void
do_plt_fde_location(const Output_data*, unsigned char*,
uint64_t*, off_t*) const;
// Stash info about branches, for stub generation.
void
push_branch(Powerpc_relobj<size, big_endian>* ppc_object,
unsigned int data_shndx, Address r_offset,
unsigned int r_type, unsigned int r_sym, Address addend)
{
Branch_info info(ppc_object, data_shndx, r_offset, r_type, r_sym, addend);
this->branch_info_.push_back(info);
if (r_type == elfcpp::R_POWERPC_REL14
|| r_type == elfcpp::R_POWERPC_REL14_BRTAKEN
|| r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN)
ppc_object->set_has_14bit_branch(data_shndx);
}
// Return whether the last branch is a plt call, and if so, mark the
// branch as having an R_PPC64_TOCSAVE.
bool
mark_pltcall(Powerpc_relobj<size, big_endian>* ppc_object,
unsigned int data_shndx, Address r_offset, Symbol_table* symtab)
{
return (size == 64
&& !this->branch_info_.empty()
&& this->branch_info_.back().mark_pltcall(ppc_object, data_shndx,
r_offset, this, symtab));
}
// Say the given location, that of a nop in a function prologue with
// an R_PPC64_TOCSAVE reloc, will be used to save r2.
// R_PPC64_TOCSAVE relocs on nops following calls point at this nop.
void
add_tocsave(Powerpc_relobj<size, big_endian>* ppc_object,
unsigned int shndx, Address offset)
{
Symbol_location loc;
loc.object = ppc_object;
loc.shndx = shndx;
loc.offset = offset;
this->tocsave_loc_.insert(loc);
}
// Accessor
const Tocsave_loc*
tocsave_loc() const
{
return &this->tocsave_loc_;
}
void
do_define_standard_symbols(Symbol_table*, Layout*);
// Finalize the sections.
void
do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
// Return the value to use for a dynamic which requires special
// treatment.
uint64_t
do_dynsym_value(const Symbol*) const;
// Return the PLT address to use for a local symbol.
uint64_t
do_plt_address_for_local(const Relobj*, unsigned int) const;
// Return the PLT address to use for a global symbol.
uint64_t
do_plt_address_for_global(const Symbol*) const;
// Return the offset to use for the GOT_INDX'th got entry which is
// for a local tls symbol specified by OBJECT, SYMNDX.
int64_t
do_tls_offset_for_local(const Relobj* object,
unsigned int symndx,
unsigned int got_indx) const;
// Return the offset to use for the GOT_INDX'th got entry which is
// for global tls symbol GSYM.
int64_t
do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const;
void
do_function_location(Symbol_location*) const;
bool
do_can_check_for_function_pointers() const
{ return true; }
// Adjust -fsplit-stack code which calls non-split-stack code.
void
do_calls_non_split(Relobj* object, unsigned int shndx,
section_offset_type fnoffset, section_size_type fnsize,
const unsigned char* prelocs, size_t reloc_count,
unsigned char* view, section_size_type view_size,
std::string* from, std::string* to) const;
// Relocate a section.
void
relocate_section(const Relocate_info<size, big_endian>*,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
unsigned char* view,
Address view_address,
section_size_type view_size,
const Reloc_symbol_changes*);
// Scan the relocs during a relocatable link.
void
scan_relocatable_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols,
Relocatable_relocs*);
// Scan the relocs for --emit-relocs.
void
emit_relocs_scan(Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_syms,
Relocatable_relocs* rr);
// Emit relocations for a section.
void
relocate_relocs(const Relocate_info<size, big_endian>*,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
typename elfcpp::Elf_types<size>::Elf_Off
offset_in_output_section,
unsigned char*,
Address view_address,
section_size_type,
unsigned char* reloc_view,
section_size_type reloc_view_size);
// Return whether SYM is defined by the ABI.
bool
do_is_defined_by_abi(const Symbol* sym) const
{
return strcmp(sym->name(), "__tls_get_addr") == 0;
}
// Return the size of the GOT section.
section_size_type
got_size() const
{
gold_assert(this->got_ != NULL);
return this->got_->data_size();
}
// Get the PLT section.
const Output_data_plt_powerpc<size, big_endian>*
plt_section() const
{
gold_assert(this->plt_ != NULL);
return this->plt_;
}
// Get the IPLT section.
const Output_data_plt_powerpc<size, big_endian>*
iplt_section() const
{
gold_assert(this->iplt_ != NULL);
return this->iplt_;
}
// Get the LPLT section.
const Output_data_plt_powerpc<size, big_endian>*
lplt_section() const
{
return this->lplt_;
}
// Return the plt offset and section for the given global sym.
Address
plt_off(const Symbol* gsym,
const Output_data_plt_powerpc<size, big_endian>** sec) const
{
if (gsym->type() == elfcpp::STT_GNU_IFUNC
&& gsym->can_use_relative_reloc(false))
*sec = this->iplt_section();
else
*sec = this->plt_section();
return gsym->plt_offset();
}
// Return the plt offset and section for the given local sym.
Address
plt_off(const Sized_relobj_file<size, big_endian>* relobj,
unsigned int local_sym_index,
const Output_data_plt_powerpc<size, big_endian>** sec) const
{
const Symbol_value<size>* lsym = relobj->local_symbol(local_sym_index);
if (lsym->is_ifunc_symbol())
*sec = this->iplt_section();
else
*sec = this->lplt_section();
return relobj->local_plt_offset(local_sym_index);
}
// Get the .glink section.
const Output_data_glink<size, big_endian>*
glink_section() const
{
gold_assert(this->glink_ != NULL);
return this->glink_;
}
Output_data_glink<size, big_endian>*
glink_section()
{
gold_assert(this->glink_ != NULL);
return this->glink_;
}
bool has_glink() const
{ return this->glink_ != NULL; }
// Get the GOT section.
const Output_data_got_powerpc<size, big_endian>*
got_section() const
{
gold_assert(this->got_ != NULL);
return this->got_;
}
// Get the GOT section, creating it if necessary.
Output_data_got_powerpc<size, big_endian>*
got_section(Symbol_table*, Layout*);
Object*
do_make_elf_object(const std::string&, Input_file*, off_t,
const elfcpp::Ehdr<size, big_endian>&);
// Return the number of entries in the GOT.
unsigned int
got_entry_count() const
{
if (this->got_ == NULL)
return 0;
return this->got_size() / (size / 8);
}
// Return the number of entries in the PLT.
unsigned int
plt_entry_count() const;
// Return the offset of the first non-reserved PLT entry.
unsigned int
first_plt_entry_offset() const
{
if (size == 32)
return 0;
if (this->abiversion() >= 2)
return 16;
return 24;
}
// Return the size of each PLT entry.
unsigned int
plt_entry_size() const
{
if (size == 32)
return 4;
if (this->abiversion() >= 2)
return 8;
return 24;
}
Output_data_save_res<size, big_endian>*
savres_section() const
{
return this->savres_section_;
}
// Add any special sections for this symbol to the gc work list.
// For powerpc64, this adds the code section of a function
// descriptor.
void
do_gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const;
// Handle target specific gc actions when adding a gc reference from
// SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX
// and DST_OFF. For powerpc64, this adds a referenc to the code
// section of a function descriptor.
void
do_gc_add_reference(Symbol_table* symtab,
Relobj* src_obj,
unsigned int src_shndx,
Relobj* dst_obj,
unsigned int dst_shndx,
Address dst_off) const;
typedef std::vector<Stub_table<size, big_endian>*> Stub_tables;
const Stub_tables&
stub_tables() const
{ return this->stub_tables_; }
const Output_data_brlt_powerpc<size, big_endian>*
brlt_section() const
{ return this->brlt_section_; }
void
add_branch_lookup_table(Address to)
{
unsigned int off = this->branch_lookup_table_.size() * (size / 8);
this->branch_lookup_table_.insert(std::make_pair(to, off));
}
Address
find_branch_lookup_table(Address to)
{
typename Branch_lookup_table::const_iterator p
= this->branch_lookup_table_.find(to);
return p == this->branch_lookup_table_.end() ? invalid_address : p->second;
}
void
write_branch_lookup_table(unsigned char *oview)
{
for (typename Branch_lookup_table::const_iterator p
= this->branch_lookup_table_.begin();
p != this->branch_lookup_table_.end();
++p)
{
elfcpp::Swap<size, big_endian>::writeval(oview + p->second, p->first);
}
}
// Wrapper used after relax to define a local symbol in output data,
// from the end if value < 0.
void
define_local(Symbol_table* symtab, const char* name,
Output_data* od, Address value, unsigned int symsize)
{
Symbol* sym
= symtab->define_in_output_data(name, NULL, Symbol_table::PREDEFINED,
od, value, symsize, elfcpp::STT_NOTYPE,
elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN, 0,
static_cast<Signed_address>(value) < 0,
false);
// We are creating this symbol late, so need to fix up things
// done early in Layout::finalize.
sym->set_dynsym_index(-1U);
}
void
set_power10_relocs()
{
this->power10_relocs_ = true;
}
bool
power10_stubs() const
{
return (this->power10_relocs_
&& (parameters->options().power10_stubs_enum()
!= General_options::POWER10_STUBS_NO));
}
bool
power10_stubs_auto() const
{
return (parameters->options().power10_stubs_enum()
== General_options::POWER10_STUBS_AUTO);
}
bool
plt_thread_safe() const
{ return this->plt_thread_safe_; }
bool
plt_localentry0() const
{ return this->plt_localentry0_; }
bool
has_localentry0() const
{ return this->has_localentry0_; }
void
set_has_localentry0()
{
this->has_localentry0_ = true;
}
bool
is_elfv2_localentry0(const Symbol* gsym) const
{
return (size == 64
&& this->abiversion() >= 2
&& this->plt_localentry0()
&& gsym->type() == elfcpp::STT_FUNC
&& gsym->is_defined()
&& gsym->nonvis() >> 3 == 0
&& !gsym->non_zero_localentry());
}
bool
is_elfv2_localentry0(const Sized_relobj_file<size, big_endian>* object,
unsigned int r_sym) const
{
const Powerpc_relobj<size, big_endian>* ppc_object
= static_cast<const Powerpc_relobj<size, big_endian>*>(object);
if (size == 64
&& this->abiversion() >= 2
&& this->plt_localentry0()
&& ppc_object->st_other(r_sym) >> 5 == 0)
{
const Symbol_value<size>* psymval = object->local_symbol(r_sym);
bool is_ordinary;
if (!psymval->is_ifunc_symbol()
&& psymval->input_shndx(&is_ordinary) != elfcpp::SHN_UNDEF
&& is_ordinary)
return true;
}
return false;
}
bool
tprel_opt() const
{ return !this->no_tprel_opt_ && parameters->options().tls_optimize(); }
void
set_no_tprel_opt()
{ this->no_tprel_opt_ = true; }
// Remember any symbols seen with non-zero localentry, even those
// not providing a definition
bool
resolve(Symbol* to, const elfcpp::Sym<size, big_endian>& sym, Object*,
const char*)
{
if (size == 64)
{
unsigned char st_other = sym.get_st_other();
if ((st_other & elfcpp::STO_PPC64_LOCAL_MASK) != 0)
to->set_non_zero_localentry();
}
// We haven't resolved anything, continue normal processing.
return false;
}
int
abiversion() const
{ return this->processor_specific_flags() & elfcpp::EF_PPC64_ABI; }
void
set_abiversion(int ver)
{
elfcpp::Elf_Word flags = this->processor_specific_flags();
flags &= ~elfcpp::EF_PPC64_ABI;
flags |= ver & elfcpp::EF_PPC64_ABI;
this->set_processor_specific_flags(flags);
}
Symbol*
tls_get_addr_opt() const
{ return this->tls_get_addr_opt_; }
Symbol*
tls_get_addr() const
{ return this->tls_get_addr_; }
// If optimizing __tls_get_addr calls, whether this is the
// "__tls_get_addr" symbol.
bool
is_tls_get_addr_opt(const Symbol* gsym) const
{
return this->tls_get_addr_opt_ && (gsym == this->tls_get_addr_
|| gsym == this->tls_get_addr_opt_);
}
bool
replace_tls_get_addr(const Symbol* gsym) const
{ return this->tls_get_addr_opt_ && gsym == this->tls_get_addr_; }
void
set_has_tls_get_addr_opt()
{ this->has_tls_get_addr_opt_ = true; }
// Offset to toc save stack slot
int
stk_toc() const
{ return this->abiversion() < 2 ? 40 : 24; }
// Offset to linker save stack slot. ELFv2 doesn't have a linker word,
// so use the CR save slot. Used only by __tls_get_addr call stub,
// relying on __tls_get_addr not saving CR itself.
int
stk_linker() const
{ return this->abiversion() < 2 ? 32 : 8; }
// Merge object attributes from input object with those in the output.
void
merge_object_attributes(const Object*, const Attributes_section_data*);
private:
class Track_tls
{
public:
enum Tls_get_addr
{
NOT_EXPECTED = 0,
EXPECTED = 1,
SKIP = 2,
NORMAL = 3
};
Track_tls()
: tls_get_addr_state_(NOT_EXPECTED),
relinfo_(NULL), relnum_(0), r_offset_(0)
{ }
~Track_tls()
{
if (this->tls_get_addr_state_ != NOT_EXPECTED)
this->missing();
}
void
missing(void)
{
if (this->relinfo_ != NULL)
gold_error_at_location(this->relinfo_, this->relnum_, this->r_offset_,
_("missing expected __tls_get_addr call"));
}
void
expect_tls_get_addr_call(
const Relocate_info<size, big_endian>* relinfo,
size_t relnum,
Address r_offset)
{
this->tls_get_addr_state_ = EXPECTED;
this->relinfo_ = relinfo;
this->relnum_ = relnum;
this->r_offset_ = r_offset;
}
void
expect_tls_get_addr_call()
{ this->tls_get_addr_state_ = EXPECTED; }
void
skip_next_tls_get_addr_call()
{this->tls_get_addr_state_ = SKIP; }
Tls_get_addr
maybe_skip_tls_get_addr_call(Target_powerpc<size, big_endian>* target,
unsigned int r_type, const Symbol* gsym)
{
bool is_tls_call
= ((r_type == elfcpp::R_POWERPC_REL24
|| (size == 64 && r_type == elfcpp::R_PPC64_REL24_NOTOC)
|| r_type == elfcpp::R_PPC_PLTREL24
|| is_plt16_reloc<size>(r_type)
|| r_type == elfcpp::R_PPC64_PLT_PCREL34
|| r_type == elfcpp::R_PPC64_PLT_PCREL34_NOTOC
|| r_type == elfcpp::R_POWERPC_PLTSEQ
|| r_type == elfcpp::R_POWERPC_PLTCALL
|| r_type == elfcpp::R_PPC64_PLTSEQ_NOTOC
|| r_type == elfcpp::R_PPC64_PLTCALL_NOTOC)
&& gsym != NULL
&& (gsym == target->tls_get_addr()
|| gsym == target->tls_get_addr_opt()));
Tls_get_addr last_tls = this->tls_get_addr_state_;
this->tls_get_addr_state_ = NOT_EXPECTED;
if (is_tls_call && last_tls != EXPECTED)
return last_tls;
else if (!is_tls_call && last_tls != NOT_EXPECTED)
{
this->missing();
return EXPECTED;
}
return NORMAL;
}
private:
// What we're up to regarding calls to __tls_get_addr.
// On powerpc, the branch and link insn making a call to
// __tls_get_addr is marked with a relocation, R_PPC64_TLSGD,
// R_PPC64_TLSLD, R_PPC_TLSGD or R_PPC_TLSLD, in addition to the
// usual R_POWERPC_REL24 or R_PPC_PLTREL24 relocation on a call.
// The marker relocation always comes first, and has the same
// symbol as the reloc on the insn setting up the __tls_get_addr
// argument. This ties the arg setup insn with the call insn,
// allowing ld to safely optimize away the call. We check that
// every call to __tls_get_addr has a marker relocation, and that
// every marker relocation is on a call to __tls_get_addr.
Tls_get_addr tls_get_addr_state_;
// Info about the last reloc for error message.
const Relocate_info<size, big_endian>* relinfo_;
size_t relnum_;
Address r_offset_;
};
// The class which scans relocations.
class Scan : protected Track_tls
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
Scan()
: Track_tls(), issued_non_pic_error_(false)
{ }
static inline int
get_reference_flags(unsigned int r_type, const Target_powerpc* target);
inline void
local(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
const elfcpp::Sym<size, big_endian>& lsym,
bool is_discarded);
inline void
global(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
Symbol* gsym);
inline bool
local_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
Target_powerpc* ,
Sized_relobj_file<size, big_endian>* relobj,
unsigned int ,
Output_section* ,
const elfcpp::Rela<size, big_endian>& ,
unsigned int r_type,
const elfcpp::Sym<size, big_endian>&)
{
// PowerPC64 .opd is not folded, so any identical function text
// may be folded and we'll still keep function addresses distinct.
// That means no reloc is of concern here.
if (size == 64)
{
Powerpc_relobj<size, big_endian>* ppcobj = static_cast
<Powerpc_relobj<size, big_endian>*>(relobj);
if (ppcobj->abiversion() == 1)
return false;
}
// For 32-bit and ELFv2, conservatively assume anything but calls to
// function code might be taking the address of the function.
return !is_branch_reloc<size>(r_type);
}
inline bool
global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
Target_powerpc* ,
Sized_relobj_file<size, big_endian>* relobj,
unsigned int ,
Output_section* ,
const elfcpp::Rela<size, big_endian>& ,
unsigned int r_type,
Symbol*)
{
// As above.
if (size == 64)
{
Powerpc_relobj<size, big_endian>* ppcobj = static_cast
<Powerpc_relobj<size, big_endian>*>(relobj);
if (ppcobj->abiversion() == 1)
return false;
}
return !is_branch_reloc<size>(r_type);
}
static bool
reloc_needs_plt_for_ifunc(Target_powerpc<size, big_endian>* target,
Sized_relobj_file<size, big_endian>* object,
unsigned int r_type, bool report_err);
private:
static void
unsupported_reloc_local(Sized_relobj_file<size, big_endian>*,
unsigned int r_type);
static void
unsupported_reloc_global(Sized_relobj_file<size, big_endian>*,
unsigned int r_type, Symbol*);
static void
generate_tls_call(Symbol_table* symtab, Layout* layout,
Target_powerpc* target);
void
check_non_pic(Relobj*, unsigned int r_type);
// Whether we have issued an error about a non-PIC compilation.
bool issued_non_pic_error_;
};
bool
symval_for_branch(const Symbol_table* symtab,
const Sized_symbol<size>* gsym,
Powerpc_relobj<size, big_endian>* object,
Address *value, unsigned int *dest_shndx);
// The class which implements relocation.
class Relocate : protected Track_tls
{
public:
// Use 'at' branch hints when true, 'y' when false.
// FIXME maybe: set this with an option.
static const bool is_isa_v2 = true;
Relocate()
: Track_tls()
{ }
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
relocate(const Relocate_info<size, big_endian>*, unsigned int,
Target_powerpc*, Output_section*, size_t, const unsigned char*,
const Sized_symbol<size>*, const Symbol_value<size>*,
unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type);
};
class Relocate_comdat_behavior
{
public:
// Decide what the linker should do for relocations that refer to
// discarded comdat sections.
inline Comdat_behavior
get(const char* name)
{
gold::Default_comdat_behavior default_behavior;
Comdat_behavior ret = default_behavior.get(name);
if (ret == CB_ERROR)
{
if (size == 32
&& (strcmp(name, ".fixup") == 0
|| strcmp(name, ".got2") == 0))
ret = CB_IGNORE;
if (size == 64
&& (strcmp(name, ".opd") == 0
|| strcmp(name, ".toc") == 0
|| strcmp(name, ".toc1") == 0))
ret = CB_IGNORE;
}
return ret;
}
};
// Optimize the TLS relocation type based on what we know about the
// symbol. IS_FINAL is true if the final address of this symbol is
// known at link time.
tls::Tls_optimization
optimize_tls_gd(bool is_final)
{
// If we are generating a shared library, then we can't do anything
// in the linker.
if (parameters->options().shared()
|| !parameters->options().tls_optimize())
return tls::TLSOPT_NONE;
if (!is_final)
return tls::TLSOPT_TO_IE;
return tls::TLSOPT_TO_LE;
}
tls::Tls_optimization
optimize_tls_ld()
{
if (parameters->options().shared()
|| !parameters->options().tls_optimize())
return tls::TLSOPT_NONE;
return tls::TLSOPT_TO_LE;
}
tls::Tls_optimization
optimize_tls_ie(bool is_final)
{
if (!is_final
|| parameters->options().shared()
|| !parameters->options().tls_optimize())
return tls::TLSOPT_NONE;
return tls::TLSOPT_TO_LE;
}
// Create glink.
void
make_glink_section(Layout*);
// Create the PLT section.
void
make_plt_section(Symbol_table*, Layout*);
void
make_iplt_section(Symbol_table*, Layout*);
void
make_lplt_section(Layout*);
void
make_brlt_section(Layout*);
// Create a PLT entry for a global symbol.
void
make_plt_entry(Symbol_table*, Layout*, Symbol*);
// Create a PLT entry for a local IFUNC symbol.
void
make_local_ifunc_plt_entry(Symbol_table*, Layout*,
Sized_relobj_file<size, big_endian>*,
unsigned int);
// Create a PLT entry for a local non-IFUNC symbol.
void
make_local_plt_entry(Layout*,
Sized_relobj_file<size, big_endian>*,
unsigned int);
// Create a GOT entry for local dynamic __tls_get_addr.
unsigned int
tlsld_got_offset(Symbol_table* symtab, Layout* layout,
Sized_relobj_file<size, big_endian>* object);
unsigned int
tlsld_got_offset() const
{
return this->tlsld_got_offset_;
}
// Get the dynamic reloc section, creating it if necessary.
Reloc_section*
rela_dyn_section(Layout*);
// Similarly, but for ifunc symbols get the one for ifunc.
Reloc_section*
rela_dyn_section(Symbol_table*, Layout*, bool for_ifunc);
// Copy a relocation against a global symbol.
void
copy_reloc(Symbol_table* symtab, Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int shndx, Output_section* output_section,
Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
{
unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
this->copy_relocs_.copy_reloc(symtab, layout,
symtab->get_sized_symbol<size>(sym),
object, shndx, output_section,
r_type, reloc.get_r_offset(),
reloc.get_r_addend(),
this->rela_dyn_section(layout));
}
// Look over all the input sections, deciding where to place stubs.
void
group_sections(Layout*, const Task*, bool);
// Sort output sections by address.
struct Sort_sections
{
bool
operator()(const Output_section* sec1, const Output_section* sec2)
{ return sec1->address() < sec2->address(); }
};
class Branch_info
{
public:
Branch_info(Powerpc_relobj<size, big_endian>* ppc_object,
unsigned int data_shndx,
Address r_offset,
unsigned int r_type,
unsigned int r_sym,
Address addend)
: object_(ppc_object), shndx_(data_shndx), offset_(r_offset),
r_type_(r_type), tocsave_ (0), r_sym_(r_sym), addend_(addend)
{ }
~Branch_info()
{ }
// Return whether this branch is going via a plt call stub, and if
// so, mark it as having an R_PPC64_TOCSAVE.
bool
mark_pltcall(Powerpc_relobj<size, big_endian>* ppc_object,
unsigned int shndx, Address offset,
Target_powerpc* target, Symbol_table* symtab);
// If this branch needs a plt call stub, or a long branch stub, make one.
bool
make_stub(Stub_table<size, big_endian>*,
Stub_table<size, big_endian>*,
Symbol_table*) const;
private:
// The branch location..
Powerpc_relobj<size, big_endian>* object_;
unsigned int shndx_;
Address offset_;
// ..and the branch type and destination.
unsigned int r_type_ : 31;
unsigned int tocsave_ : 1;
unsigned int r_sym_;
Address addend_;
};
// Information about this specific target which we pass to the
// general Target structure.
static Target::Target_info powerpc_info;
// The types of GOT entries needed for this platform.
// These values are exposed to the ABI in an incremental link.
// Do not renumber existing values without changing the version
// number of the .gnu_incremental_inputs section.
enum Got_type
{
GOT_TYPE_STANDARD,
GOT_TYPE_TLSGD, // double entry for @got@tlsgd
GOT_TYPE_DTPREL, // entry for @got@dtprel
GOT_TYPE_TPREL // entry for @got@tprel
};
// The GOT section.
Output_data_got_powerpc<size, big_endian>* got_;
// The PLT section. This is a container for a table of addresses,
// and their relocations. Each address in the PLT has a dynamic
// relocation (R_*_JMP_SLOT) and each address will have a
// corresponding entry in .glink for lazy resolution of the PLT.
// ppc32 initialises the PLT to point at the .glink entry, while
// ppc64 leaves this to ld.so. To make a call via the PLT, the
// linker adds a stub that loads the PLT entry into ctr then
// branches to ctr. There may be more than one stub for each PLT
// entry. DT_JMPREL points at the first PLT dynamic relocation and
// DT_PLTRELSZ gives the total size of PLT dynamic relocations.
Output_data_plt_powerpc<size, big_endian>* plt_;
// The IPLT section. Like plt_, this is a container for a table of
// addresses and their relocations, specifically for STT_GNU_IFUNC
// functions that resolve locally (STT_GNU_IFUNC functions that
// don't resolve locally go in PLT). Unlike plt_, these have no
// entry in .glink for lazy resolution, and the relocation section
// does not have a 1-1 correspondence with IPLT addresses. In fact,
// the relocation section may contain relocations against
// STT_GNU_IFUNC symbols at locations outside of IPLT. The
// relocation section will appear at the end of other dynamic
// relocations, so that ld.so applies these relocations after other
// dynamic relocations. In a static executable, the relocation
// section is emitted and marked with __rela_iplt_start and
// __rela_iplt_end symbols.
Output_data_plt_powerpc<size, big_endian>* iplt_;
// A PLT style section for local, non-ifunc symbols
Output_data_plt_powerpc<size, big_endian>* lplt_;
// Section holding long branch destinations.
Output_data_brlt_powerpc<size, big_endian>* brlt_section_;
// The .glink section.
Output_data_glink<size, big_endian>* glink_;
// The dynamic reloc section.
Reloc_section* rela_dyn_;
// Relocs saved to avoid a COPY reloc.
Powerpc_copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
// Offset of the GOT entry for local dynamic __tls_get_addr calls.
unsigned int tlsld_got_offset_;
Stub_tables stub_tables_;
typedef Unordered_map<Address, unsigned int> Branch_lookup_table;
Branch_lookup_table branch_lookup_table_;
typedef std::vector<Branch_info> Branches;
Branches branch_info_;
Tocsave_loc tocsave_loc_;
bool power10_relocs_;
bool plt_thread_safe_;
bool plt_localentry0_;
bool plt_localentry0_init_;
bool has_localentry0_;
bool has_tls_get_addr_opt_;
bool no_tprel_opt_;
bool relax_failed_;
int relax_fail_count_;
int32_t stub_group_size_;
Output_data_save_res<size, big_endian> *savres_section_;
// The "__tls_get_addr" symbol, if present
Symbol* tls_get_addr_;
// If optimizing __tls_get_addr calls, the "__tls_get_addr_opt" symbol.
Symbol* tls_get_addr_opt_;
// Attributes in output.
Attributes_section_data* attributes_section_data_;
// Last input file to change various attribute tags
const char* last_fp_;
const char* last_ld_;
const char* last_vec_;
const char* last_struct_;
};
template<>
Target::Target_info Target_powerpc<32, true>::powerpc_info =
{
32, // size
true, // is_big_endian
elfcpp::EM_PPC, // machine_code
false, // has_make_symbol
false, // has_resolve
false, // has_code_fill
true, // is_default_stack_executable
false, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
4 * 1024, // common_pagesize (overridable by -z common-page-size)
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
"_start", // entry_symbol_name
32, // hash_entry_size
elfcpp::SHT_PROGBITS, // unwind_section_type
};
template<>
Target::Target_info Target_powerpc<32, false>::powerpc_info =
{
32, // size
false, // is_big_endian
elfcpp::EM_PPC, // machine_code
false, // has_make_symbol
false, // has_resolve
false, // has_code_fill
true, // is_default_stack_executable
false, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
4 * 1024, // common_pagesize (overridable by -z common-page-size)
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
"_start", // entry_symbol_name
32, // hash_entry_size
elfcpp::SHT_PROGBITS, // unwind_section_type
};
template<>
Target::Target_info Target_powerpc<64, true>::powerpc_info =
{
64, // size
true, // is_big_endian
elfcpp::EM_PPC64, // machine_code
false, // has_make_symbol
true, // has_resolve
false, // has_code_fill
false, // is_default_stack_executable
false, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
4 * 1024, // common_pagesize (overridable by -z common-page-size)
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
"_start", // entry_symbol_name
32, // hash_entry_size
elfcpp::SHT_PROGBITS, // unwind_section_type
};
template<>
Target::Target_info Target_powerpc<64, false>::powerpc_info =
{
64, // size
false, // is_big_endian
elfcpp::EM_PPC64, // machine_code
false, // has_make_symbol
true, // has_resolve
false, // has_code_fill
false, // is_default_stack_executable
false, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
4 * 1024, // common_pagesize (overridable by -z common-page-size)
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
"_start", // entry_symbol_name
32, // hash_entry_size
elfcpp::SHT_PROGBITS, // unwind_section_type
};
template<int size>
inline bool
is_branch_reloc(unsigned int r_type)
{
return (r_type == elfcpp::R_POWERPC_REL24
|| (size == 64 && r_type == elfcpp::R_PPC64_REL24_NOTOC)
|| r_type == elfcpp::R_PPC_PLTREL24
|| r_type == elfcpp::R_PPC_LOCAL24PC
|| r_type == elfcpp::R_POWERPC_REL14
|| r_type == elfcpp::R_POWERPC_REL14_BRTAKEN
|| r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN
|| r_type == elfcpp::R_POWERPC_ADDR24
|| r_type == elfcpp::R_POWERPC_ADDR14
|| r_type == elfcpp::R_POWERPC_ADDR14_BRTAKEN
|| r_type == elfcpp::R_POWERPC_ADDR14_BRNTAKEN);
}
// Reloc resolves to plt entry.
template<int size>
inline bool
is_plt16_reloc(unsigned int r_type)
{
return (r_type == elfcpp::R_POWERPC_PLT16_LO
|| r_type == elfcpp::R_POWERPC_PLT16_HI
|| r_type == elfcpp::R_POWERPC_PLT16_HA
|| (size == 64 && r_type == elfcpp::R_PPC64_PLT16_LO_DS));
}
// GOT_TYPE_STANDARD (ie. not TLS) GOT relocs
inline bool
is_got_reloc(unsigned int r_type)
{
return (r_type == elfcpp::R_POWERPC_GOT16
|| r_type == elfcpp::R_POWERPC_GOT16_LO
|| r_type == elfcpp::R_POWERPC_GOT16_HI
|| r_type == elfcpp::R_POWERPC_GOT16_HA
|| r_type == elfcpp::R_PPC64_GOT16_DS
|| r_type == elfcpp::R_PPC64_GOT16_LO_DS
|| r_type == elfcpp::R_PPC64_GOT_PCREL34);
}
// If INSN is an opcode that may be used with an @tls operand, return
// the transformed insn for TLS optimisation, otherwise return 0. If
// REG is non-zero only match an insn with RB or RA equal to REG.
uint32_t
at_tls_transform(uint32_t insn, unsigned int reg)
{
if ((insn & (0x3f << 26)) != 31 << 26)
return 0;
unsigned int rtra;
if (reg == 0 || ((insn >> 11) & 0x1f) == reg)
rtra = insn & ((1 << 26) - (1 << 16));
else if (((insn >> 16) & 0x1f) == reg)
rtra = (insn & (0x1f << 21)) | ((insn & (0x1f << 11)) << 5);
else
return 0;
if ((insn & (0x3ff << 1)) == 266 << 1)
// add -> addi
insn = 14 << 26;
else if ((insn & (0x1f << 1)) == 23 << 1
&& ((insn & (0x1f << 6)) < 14 << 6
|| ((insn & (0x1f << 6)) >= 16 << 6
&& (insn & (0x1f << 6)) < 24 << 6)))
// load and store indexed -> dform
insn = (32 | ((insn >> 6) & 0x1f)) << 26;
else if ((insn & (((0x1a << 5) | 0x1f) << 1)) == 21 << 1)
// ldx, ldux, stdx, stdux -> ld, ldu, std, stdu
insn = ((58 | ((insn >> 6) & 4)) << 26) | ((insn >> 6) & 1);
else if ((insn & (((0x1f << 5) | 0x1f) << 1)) == 341 << 1)
// lwax -> lwa
insn = (58 << 26) | 2;
else
return 0;
insn |= rtra;
return insn;
}
template<int size, bool big_endian>
class Powerpc_relocate_functions
{
public:
enum Overflow_check
{
CHECK_NONE,
CHECK_SIGNED,
CHECK_UNSIGNED,
CHECK_BITFIELD,
CHECK_LOW_INSN,
CHECK_HIGH_INSN
};
enum Status
{
STATUS_OK,
STATUS_OVERFLOW
};
private:
typedef Powerpc_relocate_functions<size, big_endian> This;
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedAddress;
template<int valsize>
static inline bool
has_overflow_signed(Address value)
{
// limit = 1 << (valsize - 1) without shift count exceeding size of type
Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1);
limit <<= ((valsize - 1) >> 1);
limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1));
return value + limit > (limit << 1) - 1;
}
template<int valsize>
static inline bool
has_overflow_unsigned(Address value)
{
Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1);
limit <<= ((valsize - 1) >> 1);
limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1));
return value > (limit << 1) - 1;
}
template<int valsize>
static inline bool
has_overflow_bitfield(Address value)
{
return (has_overflow_unsigned<valsize>(value)
&& has_overflow_signed<valsize>(value));
}
template<int valsize>
static inline Status
overflowed(Address value, Overflow_check overflow)
{
if (overflow == CHECK_SIGNED)
{
if (has_overflow_signed<valsize>(value))
return STATUS_OVERFLOW;
}
else if (overflow == CHECK_UNSIGNED)
{
if (has_overflow_unsigned<valsize>(value))
return STATUS_OVERFLOW;
}
else if (overflow == CHECK_BITFIELD)
{
if (has_overflow_bitfield<valsize>(value))
return STATUS_OVERFLOW;
}
return STATUS_OK;
}
// Do a simple RELA relocation
template<int fieldsize, int valsize>
static inline Status
rela(unsigned char* view, Address value, Overflow_check overflow)
{
typedef typename elfcpp::Swap<fieldsize, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
elfcpp::Swap<fieldsize, big_endian>::writeval(wv, value);
return overflowed<valsize>(value, overflow);
}
template<int fieldsize, int valsize>
static inline Status
rela(unsigned char* view,
unsigned int right_shift,
typename elfcpp::Valtype_base<fieldsize>::Valtype dst_mask,
Address value,
Overflow_check overflow)
{
typedef typename elfcpp::Swap<fieldsize, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
Valtype val = elfcpp::Swap<fieldsize, big_endian>::readval(wv);
if (overflow == CHECK_SIGNED)
value = static_cast<SignedAddress>(value) >> right_shift;
else
value = value >> right_shift;
Valtype reloc = value;
val &= ~dst_mask;
reloc &= dst_mask;
elfcpp::Swap<fieldsize, big_endian>::writeval(wv, val | reloc);
return overflowed<valsize>(value, overflow);
}
// Do a simple RELA relocation, unaligned.
template<int fieldsize, int valsize>
static inline Status
rela_ua(unsigned char* view, Address value, Overflow_check overflow)
{
elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, value);
return overflowed<valsize>(value, overflow);
}
template<int fieldsize, int valsize>
static inline Status
rela_ua(unsigned char* view,
unsigned int right_shift,
typename elfcpp::Valtype_base<fieldsize>::Valtype dst_mask,
Address value,
Overflow_check overflow)
{
typedef typename elfcpp::Swap_unaligned<fieldsize, big_endian>::Valtype
Valtype;
Valtype val = elfcpp::Swap<fieldsize, big_endian>::readval(view);
if (overflow == CHECK_SIGNED)
value = static_cast<SignedAddress>(value) >> right_shift;
else
value = value >> right_shift;
Valtype reloc = value;
val &= ~dst_mask;
reloc &= dst_mask;
elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, val | reloc);
return overflowed<valsize>(value, overflow);
}
public:
// R_PPC64_ADDR64: (Symbol + Addend)
static inline void
addr64(unsigned char* view, Address value)
{ This::template rela<64,64>(view, value, CHECK_NONE); }
// R_PPC64_UADDR64: (Symbol + Addend) unaligned
static inline void
addr64_u(unsigned char* view, Address value)
{ This::template rela_ua<64,64>(view, value, CHECK_NONE); }
// R_POWERPC_ADDR32: (Symbol + Addend)
static inline Status
addr32(unsigned char* view, Address value, Overflow_check overflow)
{ return This::template rela<32,32>(view, value, overflow); }
// R_POWERPC_UADDR32: (Symbol + Addend) unaligned
static inline Status
addr32_u(unsigned char* view, Address value, Overflow_check overflow)
{ return This::template rela_ua<32,32>(view, value, overflow); }
// R_POWERPC_ADDR24: (Symbol + Addend) & 0x3fffffc
static inline Status
addr24(unsigned char* view, Address value, Overflow_check overflow)
{
Status stat = This::template rela<32,26>(view, 0, 0x03fffffc,
value, overflow);
if (overflow != CHECK_NONE && (value & 3) != 0)
stat = STATUS_OVERFLOW;
return stat;
}
// R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff
static inline Status
addr16(unsigned char* view, Address value, Overflow_check overflow)
{ return This::template rela<16,16>(view, value, overflow); }
// R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff, unaligned
static inline Status
addr16_u(unsigned char* view, Address value, Overflow_check overflow)
{ return This::template rela_ua<16,16>(view, value, overflow); }
// R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc
static inline Status
addr16_ds(unsigned char* view, Address value, Overflow_check overflow)
{
Status stat = This::template rela<16,16>(view, 0, 0xfffc, value, overflow);
if ((value & 3) != 0)
stat = STATUS_OVERFLOW;
return stat;
}
// R_POWERPC_ADDR16_DQ: (Symbol + Addend) & 0xfff0
static inline Status
addr16_dq(unsigned char* view, Address value, Overflow_check overflow)
{
Status stat = This::template rela<16,16>(view, 0, 0xfff0, value, overflow);
if ((value & 15) != 0)
stat = STATUS_OVERFLOW;
return stat;
}
// R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff
static inline void
addr16_hi(unsigned char* view, Address value)
{ This::template rela<16,16>(view, 16, 0xffff, value, CHECK_NONE); }
// R_POWERPC_ADDR16_HA: ((Symbol + Addend + 0x8000) >> 16) & 0xffff
static inline void
addr16_ha(unsigned char* view, Address value)
{ This::addr16_hi(view, value + 0x8000); }
// R_POWERPC_ADDR16_HIGHER: ((Symbol + Addend) >> 32) & 0xffff
static inline void
addr16_hi2(unsigned char* view, Address value)
{ This::template rela<16,16>(view, 32, 0xffff, value, CHECK_NONE); }
// R_POWERPC_ADDR16_HIGHERA: ((Symbol + Addend + 0x8000) >> 32) & 0xffff
static inline void
addr16_ha2(unsigned char* view, Address value)
{ This::addr16_hi2(view, value + 0x8000); }
// R_POWERPC_ADDR16_HIGHEST: ((Symbol + Addend) >> 48) & 0xffff
static inline void
addr16_hi3(unsigned char* view, Address value)
{ This::template rela<16,16>(view, 48, 0xffff, value, CHECK_NONE); }
// R_POWERPC_ADDR16_HIGHESTA: ((Symbol + Addend + 0x8000) >> 48) & 0xffff
static inline void
addr16_ha3(unsigned char* view, Address value)
{ This::addr16_hi3(view, value + 0x8000); }
// R_POWERPC_ADDR14: (Symbol + Addend) & 0xfffc
static inline Status
addr14(unsigned char* view, Address value, Overflow_check overflow)
{
Status stat = This::template rela<32,16>(view, 0, 0xfffc, value, overflow);
if (overflow != CHECK_NONE && (value & 3) != 0)
stat = STATUS_OVERFLOW;
return stat;
}
// R_POWERPC_REL16DX_HA
static inline Status
addr16dx_ha(unsigned char *view, Address value, Overflow_check overflow)
{
typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
value += 0x8000;
value = static_cast<SignedAddress>(value) >> 16;
val |= (value & 0xffc1) | ((value & 0x3e) << 15);
elfcpp::Swap<32, big_endian>::writeval(wv, val);
return overflowed<16>(value, overflow);
}
// R_PPC64_D34
static inline Status
addr34(unsigned char *view, uint64_t value, Overflow_check overflow)
{
Status stat = This::template rela<32,18>(view, 16, 0x3ffff,
value, overflow);
This::rela<32,16>(view + 4, 0, 0xffff, value, CHECK_NONE);
return stat;
}
// R_PPC64_D34_HI30
static inline void
addr34_hi(unsigned char *view, uint64_t value)
{ This::addr34(view, value >> 34, CHECK_NONE);}
// R_PPC64_D34_HA30
static inline void
addr34_ha(unsigned char *view, uint64_t value)
{ This::addr34_hi(view, value + (1ULL << 33));}
// R_PPC64_D28
static inline Status
addr28(unsigned char *view, uint64_t value, Overflow_check overflow)
{
Status stat = This::template rela<32,12>(view, 16, 0xfff,
value, overflow);
This::rela<32,16>(view + 4, 0, 0xffff, value, CHECK_NONE);
return stat;
}
// R_PPC64_ADDR16_HIGHER34
static inline void
addr16_higher34(unsigned char* view, uint64_t value)
{ This::addr16(view, value >> 34, CHECK_NONE); }
// R_PPC64_ADDR16_HIGHERA34
static inline void
addr16_highera34(unsigned char* view, uint64_t value)
{ This::addr16_higher34(view, value + (1ULL << 33)); }
// R_PPC64_ADDR16_HIGHEST34
static inline void
addr16_highest34(unsigned char* view, uint64_t value)
{ This::addr16(view, value >> 50, CHECK_NONE); }
// R_PPC64_ADDR16_HIGHESTA34
static inline void
addr16_highesta34(unsigned char* view, uint64_t value)
{ This::addr16_highest34(view, value + (1ULL << 33)); }
};
// Set ABI version for input and output.
template<int size, bool big_endian>
void
Powerpc_relobj<size, big_endian>::set_abiversion(int ver)
{
this->e_flags_ |= ver;
if (this->abiversion() != 0)
{
Target_powerpc<size, big_endian>* target =
static_cast<Target_powerpc<size, big_endian>*>(
parameters->sized_target<size, big_endian>());
if (target->abiversion() == 0)
target->set_abiversion(this->abiversion());
else if (target->abiversion() != this->abiversion())
gold_error(_("%s: ABI version %d is not compatible "
"with ABI version %d output"),
this->name().c_str(),
this->abiversion(), target->abiversion());
}
}
// Stash away the index of .got2, .opd, .rela.toc, and .toc in a
// relocatable object, if such sections exists.
template<int size, bool big_endian>
bool
Powerpc_relobj<size, big_endian>::do_find_special_sections(
Read_symbols_data* sd)
{
const unsigned char* const pshdrs = sd->section_headers->data();
const unsigned char* namesu = sd->section_names->data();
const char* names = reinterpret_cast<const char*>(namesu);
section_size_type names_size = sd->section_names_size;
const unsigned char* s;
s = this->template find_shdr<size, big_endian>(pshdrs,
size == 32 ? ".got2" : ".opd",
names, names_size, NULL);
if (s != NULL)
{
unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size;
this->special_ = ndx;
if (size == 64)
{
if (this->abiversion() == 0)
this->set_abiversion(1);
else if (this->abiversion() > 1)
gold_error(_("%s: .opd invalid in abiv%d"),
this->name().c_str(), this->abiversion());
}
}
if (size == 64)
{
s = this->template find_shdr<size, big_endian>(pshdrs, ".rela.toc",
names, names_size, NULL);
if (s != NULL)
{
unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size;
this->relatoc_ = ndx;
typename elfcpp::Shdr<size, big_endian> shdr(s);
this->toc_ = this->adjust_shndx(shdr.get_sh_info());
}
}
return Sized_relobj_file<size, big_endian>::do_find_special_sections(sd);
}
// Examine .rela.opd to build info about function entry points.
template<int size, bool big_endian>
void
Powerpc_relobj<size, big_endian>::scan_opd_relocs(
size_t reloc_count,
const unsigned char* prelocs,
const unsigned char* plocal_syms)
{
if (size == 64)
{
typedef typename elfcpp::Rela<size, big_endian> Reltype;
const int reloc_size = elfcpp::Elf_sizes<size>::rela_size;
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
Address expected_off = 0;
bool regular = true;
unsigned int opd_ent_size = 0;
for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
{
Reltype reloc(prelocs);
typename elfcpp::Elf_types<size>::Elf_WXword r_info
= reloc.get_r_info();
unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
if (r_type == elfcpp::R_PPC64_ADDR64)
{
unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
typename elfcpp::Elf_types<size>::Elf_Addr value;
bool is_ordinary;
unsigned int shndx;
if (r_sym < this->local_symbol_count())
{
typename elfcpp::Sym<size, big_endian>
lsym(plocal_syms + r_sym * sym_size);
shndx = lsym.get_st_shndx();
shndx = this->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
value = lsym.get_st_value();
}
else
shndx = this->symbol_section_and_value(r_sym, &value,
&is_ordinary);
this->set_opd_ent(reloc.get_r_offset(), shndx,
value + reloc.get_r_addend());
if (i == 2)
{
expected_off = reloc.get_r_offset();
opd_ent_size = expected_off;
}
else if (expected_off != reloc.get_r_offset())
regular = false;
expected_off += opd_ent_size;
}
else if (r_type == elfcpp::R_PPC64_TOC)
{
if (expected_off - opd_ent_size + 8 != reloc.get_r_offset())
regular = false;
}
else
{
gold_warning(_("%s: unexpected reloc type %u in .opd section"),
this->name().c_str(), r_type);
regular = false;
}
}
if (reloc_count <= 2)
opd_ent_size = this->section_size(this->opd_shndx());
if (opd_ent_size != 24 && opd_ent_size != 16)
regular = false;
if (!regular)
{
gold_warning(_("%s: .opd is not a regular array of opd entries"),
this->name().c_str());
opd_ent_size = 0;
}
}
}
// Returns true if a code sequence loading the TOC entry at VALUE
// relative to the TOC pointer can be converted into code calculating
// a TOC pointer relative offset.
// If so, the TOC pointer relative offset is stored to VALUE.
template<int size, bool big_endian>
bool
Powerpc_relobj<size, big_endian>::make_toc_relative(
Target_powerpc<size, big_endian>* target,
Address* value)
{
if (size != 64)
return false;
// With -mcmodel=medium code it is quite possible to have
// toc-relative relocs referring to objects outside the TOC.
// Don't try to look at a non-existent TOC.
if (this->toc_shndx() == 0)
return false;
// Convert VALUE back to an address by adding got_base (see below),
// then to an offset in the TOC by subtracting the TOC output
// section address and the TOC output offset. Since this TOC output
// section and the got output section are one and the same, we can
// omit adding and subtracting the output section address.
Address off = (*value + this->toc_base_offset()
- this->output_section_offset(this->toc_shndx()));
// Is this offset in the TOC? -mcmodel=medium code may be using
// TOC relative access to variables outside the TOC. Those of
// course can't be optimized. We also don't try to optimize code
// that is using a different object's TOC.
if (off >= this->section_size(this->toc_shndx()))
return false;
if (this->no_toc_opt(off))
return false;
section_size_type vlen;
unsigned char* view = this->get_output_view(this->toc_shndx(), &vlen);
Address addr = elfcpp::Swap<size, big_endian>::readval(view + off);
// The TOC pointer
Address got_base = (target->got_section()->output_section()->address()
+ this->toc_base_offset());
addr -= got_base;
if (addr + (uint64_t) 0x80008000 >= (uint64_t) 1 << 32)
return false;
*value = addr;
return true;
}
template<int size, bool big_endian>
bool
Powerpc_relobj<size, big_endian>::make_got_relative(
Target_powerpc<size, big_endian>* target,
const Symbol_value<size>* psymval,
Address addend,
Address* value)
{
Address addr = psymval->value(this, addend);
Address got_base = (target->got_section()->output_section()->address()
+ this->toc_base_offset());
addr -= got_base;
if (addr + 0x80008000 > 0xffffffff)
return false;
*value = addr;
return true;
}
// Perform the Sized_relobj_file method, then set up opd info from
// .opd relocs.
template<int size, bool big_endian>
void
Powerpc_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
{
Sized_relobj_file<size, big_endian>::do_read_relocs(rd);
if (size == 64)
{
for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
p != rd->relocs.end();
++p)
{
if (p->data_shndx == this->opd_shndx())
{
uint64_t opd_size = this->section_size(this->opd_shndx());
gold_assert(opd_size == static_cast<size_t>(opd_size));
if (opd_size != 0)
{
this->init_opd(opd_size);
this->scan_opd_relocs(p->reloc_count, p->contents->data(),
rd->local_symbols->data());
}
break;
}
}
}
}
// Read the symbols then set up st_other vector.
template<int size, bool big_endian>
void
Powerpc_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
{
this->base_read_symbols(sd);
if (this->input_file()->format() != Input_file::FORMAT_ELF)
return;
if (size == 64)
{
const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
const unsigned char* const pshdrs = sd->section_headers->data();
const unsigned int loccount = this->do_local_symbol_count();
if (loccount != 0)
{
this->st_other_.resize(loccount);
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
off_t locsize = loccount * sym_size;
const unsigned int symtab_shndx = this->symtab_shndx();
const unsigned char *psymtab = pshdrs + symtab_shndx * shdr_size;
typename elfcpp::Shdr<size, big_endian> shdr(psymtab);
const unsigned char* psyms = this->get_view(shdr.get_sh_offset(),
locsize, true, false);
psyms += sym_size;
for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
{
elfcpp::Sym<size, big_endian> sym(psyms);
unsigned char st_other = sym.get_st_other();
this->st_other_[i] = st_other;
if ((st_other & elfcpp::STO_PPC64_LOCAL_MASK) != 0)
{
if (this->abiversion() == 0)
this->set_abiversion(2);
else if (this->abiversion() < 2)
gold_error(_("%s: local symbol %d has invalid st_other"
" for ABI version 1"),
this->name().c_str(), i);
}
}
}
}
const size_t shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
const unsigned char* ps = sd->section_headers->data() + shdr_size;
bool merge_attributes = false;
for (unsigned int i = 1; i < this->shnum(); ++i, ps += shdr_size)
{
elfcpp::Shdr<size, big_endian> shdr(ps);
switch (shdr.get_sh_type())
{
case elfcpp::SHT_GNU_ATTRIBUTES:
{
gold_assert(this->attributes_section_data_ == NULL);
section_offset_type section_offset = shdr.get_sh_offset();
section_size_type section_size =
convert_to_section_size_type(shdr.get_sh_size());
const unsigned char* view =
this->get_view(section_offset, section_size, true, false);
this->attributes_section_data_ =
new Attributes_section_data(view, section_size);
}
break;
case elfcpp::SHT_SYMTAB:
{
// Sometimes an object has no contents except the section
// name string table and an empty symbol table with the
// undefined symbol. We don't want to merge
// processor-specific flags from such an object.
const typename elfcpp::Elf_types<size>::Elf_WXword sym_size =
elfcpp::Elf_sizes<size>::sym_size;
if (shdr.get_sh_size() > sym_size)
merge_attributes = true;
}
break;
case elfcpp::SHT_STRTAB:
break;
default:
merge_attributes = true;
break;
}
}
if (!merge_attributes)
{
// Should rarely happen.
delete this->attributes_section_data_;
this->attributes_section_data_ = NULL;
}
}
template<int size, bool big_endian>
void
Powerpc_dynobj<size, big_endian>::set_abiversion(int ver)
{
this->e_flags_ |= ver;
if (this->abiversion() != 0)
{
Target_powerpc<size, big_endian>* target =
static_cast<Target_powerpc<size, big_endian>*>(
parameters->sized_target<size, big_endian>());
if (target->abiversion() == 0)
target->set_abiversion(this->abiversion());
else if (target->abiversion() != this->abiversion())
gold_error(_("%s: ABI version %d is not compatible "
"with ABI version %d output"),
this->name().c_str(),
this->abiversion(), target->abiversion());
}
}
// Call Sized_dynobj::base_read_symbols to read the symbols then
// read .opd from a dynamic object, filling in opd_ent_ vector,
template<int size, bool big_endian>
void
Powerpc_dynobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
{
this->base_read_symbols(sd);
const size_t shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
const unsigned char* ps =
sd->section_headers->data() + shdr_size * (this->shnum() - 1);
for (unsigned int i = this->shnum(); i > 0; --i, ps -= shdr_size)
{
elfcpp::Shdr<size, big_endian> shdr(ps);
if (shdr.get_sh_type() == elfcpp::SHT_GNU_ATTRIBUTES)
{
section_offset_type section_offset = shdr.get_sh_offset();
section_size_type section_size =
convert_to_section_size_type(shdr.get_sh_size());
const unsigned