8362 lines
247 KiB
C++
8362 lines
247 KiB
C++
// powerpc.cc -- powerpc target support for gold.
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// Copyright (C) 2008-2014 Free Software Foundation, Inc.
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// Written by David S. Miller <davem@davemloft.net>
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// and David Edelsohn <edelsohn@gnu.org>
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "gold.h"
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#include <set>
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#include <algorithm>
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#include "elfcpp.h"
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#include "dwarf.h"
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#include "parameters.h"
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#include "reloc.h"
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#include "powerpc.h"
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#include "object.h"
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#include "symtab.h"
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#include "layout.h"
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#include "output.h"
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#include "copy-relocs.h"
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#include "target.h"
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#include "target-reloc.h"
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#include "target-select.h"
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#include "tls.h"
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#include "errors.h"
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#include "gc.h"
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namespace
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{
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using namespace gold;
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template<int size, bool big_endian>
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class Output_data_plt_powerpc;
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template<int size, bool big_endian>
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class Output_data_brlt_powerpc;
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template<int size, bool big_endian>
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class Output_data_got_powerpc;
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template<int size, bool big_endian>
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class Output_data_glink;
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template<int size, bool big_endian>
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class Stub_table;
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template<int size, bool big_endian>
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class Target_powerpc;
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struct Stub_table_owner
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{
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Output_section* output_section;
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const Output_section::Input_section* owner;
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};
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inline bool
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is_branch_reloc(unsigned int r_type);
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template<int size, bool big_endian>
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class Powerpc_relobj : public Sized_relobj_file<size, big_endian>
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{
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public:
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typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
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typedef Unordered_set<Section_id, Section_id_hash> Section_refs;
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typedef Unordered_map<Address, Section_refs> Access_from;
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Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset,
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const typename elfcpp::Ehdr<size, big_endian>& ehdr)
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: Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr),
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special_(0), has_small_toc_reloc_(false), opd_valid_(false),
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opd_ent_(), access_from_map_(), has14_(), stub_table_index_(),
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e_flags_(ehdr.get_e_flags()), st_other_()
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{
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this->set_abiversion(0);
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}
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~Powerpc_relobj()
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{ }
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// Read the symbols then set up st_other vector.
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void
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do_read_symbols(Read_symbols_data*);
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// The .got2 section shndx.
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unsigned int
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got2_shndx() const
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{
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if (size == 32)
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return this->special_;
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else
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return 0;
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}
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// The .opd section shndx.
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unsigned int
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opd_shndx() const
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{
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if (size == 32)
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return 0;
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else
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return this->special_;
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}
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// Init OPD entry arrays.
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void
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init_opd(size_t opd_size)
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{
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size_t count = this->opd_ent_ndx(opd_size);
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this->opd_ent_.resize(count);
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}
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// Return section and offset of function entry for .opd + R_OFF.
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unsigned int
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get_opd_ent(Address r_off, Address* value = NULL) const
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{
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size_t ndx = this->opd_ent_ndx(r_off);
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gold_assert(ndx < this->opd_ent_.size());
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gold_assert(this->opd_ent_[ndx].shndx != 0);
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if (value != NULL)
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*value = this->opd_ent_[ndx].off;
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return this->opd_ent_[ndx].shndx;
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}
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// Set section and offset of function entry for .opd + R_OFF.
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void
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set_opd_ent(Address r_off, unsigned int shndx, Address value)
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{
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size_t ndx = this->opd_ent_ndx(r_off);
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gold_assert(ndx < this->opd_ent_.size());
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this->opd_ent_[ndx].shndx = shndx;
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this->opd_ent_[ndx].off = value;
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}
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// Return discard flag for .opd + R_OFF.
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bool
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get_opd_discard(Address r_off) const
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{
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size_t ndx = this->opd_ent_ndx(r_off);
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gold_assert(ndx < this->opd_ent_.size());
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return this->opd_ent_[ndx].discard;
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}
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// Set discard flag for .opd + R_OFF.
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void
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set_opd_discard(Address r_off)
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{
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size_t ndx = this->opd_ent_ndx(r_off);
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gold_assert(ndx < this->opd_ent_.size());
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this->opd_ent_[ndx].discard = true;
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}
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bool
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opd_valid() const
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{ return this->opd_valid_; }
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void
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set_opd_valid()
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{ this->opd_valid_ = true; }
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// Examine .rela.opd to build info about function entry points.
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void
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scan_opd_relocs(size_t reloc_count,
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const unsigned char* prelocs,
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const unsigned char* plocal_syms);
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// Perform the Sized_relobj_file method, then set up opd info from
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// .opd relocs.
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void
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do_read_relocs(Read_relocs_data*);
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bool
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do_find_special_sections(Read_symbols_data* sd);
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// Adjust this local symbol value. Return false if the symbol
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// should be discarded from the output file.
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bool
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do_adjust_local_symbol(Symbol_value<size>* lv) const
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{
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if (size == 64 && this->opd_shndx() != 0)
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{
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bool is_ordinary;
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if (lv->input_shndx(&is_ordinary) != this->opd_shndx())
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return true;
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if (this->get_opd_discard(lv->input_value()))
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return false;
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}
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return true;
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}
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Access_from*
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access_from_map()
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{ return &this->access_from_map_; }
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// Add a reference from SRC_OBJ, SRC_INDX to this object's .opd
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// section at DST_OFF.
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void
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add_reference(Object* src_obj,
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unsigned int src_indx,
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typename elfcpp::Elf_types<size>::Elf_Addr dst_off)
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{
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Section_id src_id(src_obj, src_indx);
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this->access_from_map_[dst_off].insert(src_id);
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}
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// Add a reference to the code section specified by the .opd entry
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// at DST_OFF
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void
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add_gc_mark(typename elfcpp::Elf_types<size>::Elf_Addr dst_off)
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{
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size_t ndx = this->opd_ent_ndx(dst_off);
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if (ndx >= this->opd_ent_.size())
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this->opd_ent_.resize(ndx + 1);
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this->opd_ent_[ndx].gc_mark = true;
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}
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void
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process_gc_mark(Symbol_table* symtab)
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{
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for (size_t i = 0; i < this->opd_ent_.size(); i++)
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if (this->opd_ent_[i].gc_mark)
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{
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unsigned int shndx = this->opd_ent_[i].shndx;
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symtab->gc()->worklist().push(Section_id(this, shndx));
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}
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}
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// Return offset in output GOT section that this object will use
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// as a TOC pointer. Won't be just a constant with multi-toc support.
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Address
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toc_base_offset() const
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{ return 0x8000; }
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void
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set_has_small_toc_reloc()
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{ has_small_toc_reloc_ = true; }
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bool
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has_small_toc_reloc() const
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{ return has_small_toc_reloc_; }
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void
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set_has_14bit_branch(unsigned int shndx)
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{
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if (shndx >= this->has14_.size())
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this->has14_.resize(shndx + 1);
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this->has14_[shndx] = true;
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}
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bool
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has_14bit_branch(unsigned int shndx) const
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{ return shndx < this->has14_.size() && this->has14_[shndx]; }
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void
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set_stub_table(unsigned int shndx, unsigned int stub_index)
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{
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if (shndx >= this->stub_table_index_.size())
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this->stub_table_index_.resize(shndx + 1);
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this->stub_table_index_[shndx] = stub_index;
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}
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Stub_table<size, big_endian>*
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stub_table(unsigned int shndx)
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{
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if (shndx < this->stub_table_index_.size())
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{
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Target_powerpc<size, big_endian>* target
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= static_cast<Target_powerpc<size, big_endian>*>(
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parameters->sized_target<size, big_endian>());
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unsigned int indx = this->stub_table_index_[shndx];
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gold_assert(indx < target->stub_tables().size());
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return target->stub_tables()[indx];
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}
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return NULL;
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}
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void
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clear_stub_table()
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{
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this->stub_table_index_.clear();
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}
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int
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abiversion() const
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{ return this->e_flags_ & elfcpp::EF_PPC64_ABI; }
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// Set ABI version for input and output
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void
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set_abiversion(int ver);
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unsigned int
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ppc64_local_entry_offset(const Symbol* sym) const
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{ return elfcpp::ppc64_decode_local_entry(sym->nonvis() >> 3); }
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unsigned int
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ppc64_local_entry_offset(unsigned int symndx) const
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{ return elfcpp::ppc64_decode_local_entry(this->st_other_[symndx] >> 5); }
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private:
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struct Opd_ent
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{
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unsigned int shndx;
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bool discard : 1;
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bool gc_mark : 1;
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Address off;
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};
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// Return index into opd_ent_ array for .opd entry at OFF.
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// .opd entries are 24 bytes long, but they can be spaced 16 bytes
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// apart when the language doesn't use the last 8-byte word, the
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// environment pointer. Thus dividing the entry section offset by
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// 16 will give an index into opd_ent_ that works for either layout
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// of .opd. (It leaves some elements of the vector unused when .opd
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// entries are spaced 24 bytes apart, but we don't know the spacing
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// until relocations are processed, and in any case it is possible
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// for an object to have some entries spaced 16 bytes apart and
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// others 24 bytes apart.)
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size_t
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opd_ent_ndx(size_t off) const
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{ return off >> 4;}
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// For 32-bit the .got2 section shdnx, for 64-bit the .opd section shndx.
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unsigned int special_;
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// For 64-bit, whether this object uses small model relocs to access
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// the toc.
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bool has_small_toc_reloc_;
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// Set at the start of gc_process_relocs, when we know opd_ent_
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// vector is valid. The flag could be made atomic and set in
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// do_read_relocs with memory_order_release and then tested with
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// memory_order_acquire, potentially resulting in fewer entries in
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// access_from_map_.
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bool opd_valid_;
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// The first 8-byte word of an OPD entry gives the address of the
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// entry point of the function. Relocatable object files have a
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// relocation on this word. The following vector records the
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// section and offset specified by these relocations.
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std::vector<Opd_ent> opd_ent_;
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// References made to this object's .opd section when running
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// gc_process_relocs for another object, before the opd_ent_ vector
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// is valid for this object.
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Access_from access_from_map_;
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// Whether input section has a 14-bit branch reloc.
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std::vector<bool> has14_;
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// The stub table to use for a given input section.
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std::vector<unsigned int> stub_table_index_;
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// Header e_flags
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elfcpp::Elf_Word e_flags_;
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// ELF st_other field for local symbols.
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std::vector<unsigned char> st_other_;
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};
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template<int size, bool big_endian>
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class Powerpc_dynobj : public Sized_dynobj<size, big_endian>
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{
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public:
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typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
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Powerpc_dynobj(const std::string& name, Input_file* input_file, off_t offset,
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const typename elfcpp::Ehdr<size, big_endian>& ehdr)
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: Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr),
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opd_shndx_(0), opd_ent_(), e_flags_(ehdr.get_e_flags())
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{
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this->set_abiversion(0);
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}
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~Powerpc_dynobj()
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{ }
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// Call Sized_dynobj::do_read_symbols to read the symbols then
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// read .opd from a dynamic object, filling in opd_ent_ vector,
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void
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do_read_symbols(Read_symbols_data*);
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// The .opd section shndx.
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unsigned int
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opd_shndx() const
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{
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return this->opd_shndx_;
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}
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// The .opd section address.
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Address
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opd_address() const
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{
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return this->opd_address_;
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}
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// Init OPD entry arrays.
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void
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init_opd(size_t opd_size)
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{
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size_t count = this->opd_ent_ndx(opd_size);
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this->opd_ent_.resize(count);
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}
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// Return section and offset of function entry for .opd + R_OFF.
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unsigned int
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get_opd_ent(Address r_off, Address* value = NULL) const
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{
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size_t ndx = this->opd_ent_ndx(r_off);
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gold_assert(ndx < this->opd_ent_.size());
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gold_assert(this->opd_ent_[ndx].shndx != 0);
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if (value != NULL)
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*value = this->opd_ent_[ndx].off;
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return this->opd_ent_[ndx].shndx;
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}
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// Set section and offset of function entry for .opd + R_OFF.
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void
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set_opd_ent(Address r_off, unsigned int shndx, Address value)
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{
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size_t ndx = this->opd_ent_ndx(r_off);
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gold_assert(ndx < this->opd_ent_.size());
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this->opd_ent_[ndx].shndx = shndx;
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this->opd_ent_[ndx].off = value;
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}
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int
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abiversion() const
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{ return this->e_flags_ & elfcpp::EF_PPC64_ABI; }
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// Set ABI version for input and output.
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void
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set_abiversion(int ver);
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private:
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// Used to specify extent of executable sections.
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struct Sec_info
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{
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Sec_info(Address start_, Address len_, unsigned int shndx_)
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: start(start_), len(len_), shndx(shndx_)
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{ }
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bool
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operator<(const Sec_info& that) const
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{ return this->start < that.start; }
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Address start;
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Address len;
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unsigned int shndx;
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};
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struct Opd_ent
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{
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unsigned int shndx;
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Address off;
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};
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// Return index into opd_ent_ array for .opd entry at OFF.
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size_t
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opd_ent_ndx(size_t off) const
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{ return off >> 4;}
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// For 64-bit the .opd section shndx and address.
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unsigned int opd_shndx_;
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Address opd_address_;
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// The first 8-byte word of an OPD entry gives the address of the
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// entry point of the function. Records the section and offset
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// corresponding to the address. Note that in dynamic objects,
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// offset is *not* relative to the section.
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std::vector<Opd_ent> opd_ent_;
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// Header e_flags
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elfcpp::Elf_Word e_flags_;
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};
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template<int size, bool big_endian>
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class Target_powerpc : public Sized_target<size, big_endian>
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{
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public:
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typedef
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Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section;
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typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
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typedef typename elfcpp::Elf_types<size>::Elf_Swxword Signed_address;
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static const Address invalid_address = static_cast<Address>(0) - 1;
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// Offset of tp and dtp pointers from start of TLS block.
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static const Address tp_offset = 0x7000;
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static const Address dtp_offset = 0x8000;
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Target_powerpc()
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: Sized_target<size, big_endian>(&powerpc_info),
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got_(NULL), plt_(NULL), iplt_(NULL), brlt_section_(NULL),
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glink_(NULL), rela_dyn_(NULL), copy_relocs_(elfcpp::R_POWERPC_COPY),
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tlsld_got_offset_(-1U),
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stub_tables_(), branch_lookup_table_(), branch_info_(),
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plt_thread_safe_(false), relax_failed_(false), relax_fail_count_(0),
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stub_group_size_(0)
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|
{
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
|
|
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; }
|
|
|
|
// 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*);
|
|
|
|
// 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,
|
|
const Relocatable_relocs*,
|
|
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 .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;
|
|
}
|
|
|
|
// 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,
|
|
Object* src_obj,
|
|
unsigned int src_shndx,
|
|
Object* 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);
|
|
}
|
|
}
|
|
|
|
bool
|
|
plt_thread_safe() const
|
|
{ return this->plt_thread_safe_; }
|
|
|
|
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);
|
|
}
|
|
|
|
// Offset to to save stack slot
|
|
int
|
|
stk_toc () const
|
|
{ return this->abiversion() < 2 ? 40 : 24; }
|
|
|
|
private:
|
|
|
|
class Track_tls
|
|
{
|
|
public:
|
|
enum Tls_get_addr
|
|
{
|
|
NOT_EXPECTED = 0,
|
|
EXPECTED = 1,
|
|
SKIP = 2,
|
|
NORMAL = 3
|
|
};
|
|
|
|
Track_tls()
|
|
: tls_get_addr_(NOT_EXPECTED),
|
|
relinfo_(NULL), relnum_(0), r_offset_(0)
|
|
{ }
|
|
|
|
~Track_tls()
|
|
{
|
|
if (this->tls_get_addr_ != 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_ = EXPECTED;
|
|
this->relinfo_ = relinfo;
|
|
this->relnum_ = relnum;
|
|
this->r_offset_ = r_offset;
|
|
}
|
|
|
|
void
|
|
expect_tls_get_addr_call()
|
|
{ this->tls_get_addr_ = EXPECTED; }
|
|
|
|
void
|
|
skip_next_tls_get_addr_call()
|
|
{this->tls_get_addr_ = SKIP; }
|
|
|
|
Tls_get_addr
|
|
maybe_skip_tls_get_addr_call(unsigned int r_type, const Symbol* gsym)
|
|
{
|
|
bool is_tls_call = ((r_type == elfcpp::R_POWERPC_REL24
|
|
|| r_type == elfcpp::R_PPC_PLTREL24)
|
|
&& gsym != NULL
|
|
&& strcmp(gsym->name(), "__tls_get_addr") == 0);
|
|
Tls_get_addr last_tls = this->tls_get_addr_;
|
|
this->tls_get_addr_ = 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_PLTREL25 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_;
|
|
// 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(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(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_;
|
|
};
|
|
|
|
Address
|
|
symval_for_branch(const Symbol_table* symtab, Address value,
|
|
const Sized_symbol<size>* gsym,
|
|
Powerpc_relobj<size, big_endian>* object,
|
|
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>*, Target_powerpc*,
|
|
Output_section*, size_t relnum,
|
|
const elfcpp::Rela<size, big_endian>&,
|
|
unsigned int r_type, 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_WARNING)
|
|
{
|
|
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;
|
|
}
|
|
};
|
|
|
|
// A class which returns the size required for a relocation type,
|
|
// used while scanning relocs during a relocatable link.
|
|
class Relocatable_size_for_reloc
|
|
{
|
|
public:
|
|
unsigned int
|
|
get_size_for_reloc(unsigned int, Relobj*)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
// 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())
|
|
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())
|
|
return tls::TLSOPT_NONE;
|
|
|
|
return tls::TLSOPT_TO_LE;
|
|
}
|
|
|
|
tls::Tls_optimization
|
|
optimize_tls_ie(bool is_final)
|
|
{
|
|
if (!is_final || parameters->options().shared())
|
|
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_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 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)
|
|
{
|
|
this->copy_relocs_.copy_reloc(symtab, layout,
|
|
symtab->get_sized_symbol<size>(sym),
|
|
object, shndx, output_section,
|
|
reloc, 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), r_sym_(r_sym), addend_(addend)
|
|
{ }
|
|
|
|
~Branch_info()
|
|
{ }
|
|
|
|
// 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_;
|
|
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_;
|
|
// 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.
|
|
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_;
|
|
|
|
bool plt_thread_safe_;
|
|
|
|
bool relax_failed_;
|
|
int relax_fail_count_;
|
|
int32_t stub_group_size_;
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
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
|
|
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
|
|
};
|
|
|
|
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
|
|
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
|
|
};
|
|
|
|
inline bool
|
|
is_branch_reloc(unsigned int r_type)
|
|
{
|
|
return (r_type == elfcpp::R_POWERPC_REL24
|
|
|| 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);
|
|
}
|
|
|
|
// 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;
|
|
|
|
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);
|
|
Valtype reloc = value >> right_shift;
|
|
val &= ~dst_mask;
|
|
reloc &= dst_mask;
|
|
elfcpp::Swap<fieldsize, big_endian>::writeval(wv, val | reloc);
|
|
return overflowed<valsize>(value >> right_shift, 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);
|
|
Valtype reloc = value >> right_shift;
|
|
val &= ~dst_mask;
|
|
reloc &= dst_mask;
|
|
elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, val | reloc);
|
|
return overflowed<valsize>(value >> right_shift, 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 (overflow != CHECK_NONE && (value & 3) != 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;
|
|
}
|
|
};
|
|
|
|
// 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 or .opd in a relocatable object, if
|
|
// such a section 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());
|
|
}
|
|
}
|
|
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 Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc
|
|
Reltype;
|
|
const int reloc_size
|
|
= Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_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;
|
|
}
|
|
}
|
|
}
|
|
|
|
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 (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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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);
|
|
if (size == 64)
|
|
{
|
|
const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
|
|
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);
|
|
const unsigned char* s = NULL;
|
|
const unsigned char* opd;
|
|
section_size_type opd_size;
|
|
|
|
// Find and read .opd section.
|
|
while (1)
|
|
{
|
|
s = this->template find_shdr<size, big_endian>(pshdrs, ".opd", names,
|
|
sd->section_names_size,
|
|
s);
|
|
if (s == NULL)
|
|
return;
|
|
|
|
typename elfcpp::Shdr<size, big_endian> shdr(s);
|
|
if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS
|
|
&& (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0)
|
|
{
|
|
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());
|
|
|
|
this->opd_shndx_ = (s - pshdrs) / shdr_size;
|
|
this->opd_address_ = shdr.get_sh_addr();
|
|
opd_size = convert_to_section_size_type(shdr.get_sh_size());
|
|
opd = this->get_view(shdr.get_sh_offset(), opd_size,
|
|
true, false);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Build set of executable sections.
|
|
// Using a set is probably overkill. There is likely to be only
|
|
// a few executable sections, typically .init, .text and .fini,
|
|
// and they are generally grouped together.
|
|
typedef std::set<Sec_info> Exec_sections;
|
|
Exec_sections exec_sections;
|
|
s = pshdrs;
|
|
for (unsigned int i = 1; i < this->shnum(); ++i, s += shdr_size)
|
|
{
|
|
typename elfcpp::Shdr<size, big_endian> shdr(s);
|
|
if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS
|
|
&& ((shdr.get_sh_flags()
|
|
& (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR))
|
|
== (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR))
|
|
&& shdr.get_sh_size() != 0)
|
|
{
|
|
exec_sections.insert(Sec_info(shdr.get_sh_addr(),
|
|
shdr.get_sh_size(), i));
|
|
}
|
|
}
|
|
if (exec_sections.empty())
|
|
return;
|
|
|
|
// Look over the OPD entries. This is complicated by the fact
|
|
// that some binaries will use two-word entries while others
|
|
// will use the standard three-word entries. In most cases
|
|
// the third word (the environment pointer for languages like
|
|
// Pascal) is unused and will be zero. If the third word is
|
|
// used it should not be pointing into executable sections,
|
|
// I think.
|
|
this->init_opd(opd_size);
|
|
for (const unsigned char* p = opd; p < opd + opd_size; p += 8)
|
|
{
|
|
typedef typename elfcpp::Swap<64, big_endian>::Valtype Valtype;
|
|
const Valtype* valp = reinterpret_cast<const Valtype*>(p);
|
|
Valtype val = elfcpp::Swap<64, big_endian>::readval(valp);
|
|
if (val == 0)
|
|
// Chances are that this is the third word of an OPD entry.
|
|
continue;
|
|
typename Exec_sections::const_iterator e
|
|
= exec_sections.upper_bound(Sec_info(val, 0, 0));
|
|
if (e != exec_sections.begin())
|
|
{
|
|
--e;
|
|
if (e->start <= val && val < e->start + e->len)
|
|
{
|
|
// We have an address in an executable section.
|
|
// VAL ought to be the function entry, set it up.
|
|
this->set_opd_ent(p - opd, e->shndx, val);
|
|
// Skip second word of OPD entry, the TOC pointer.
|
|
p += 8;
|
|
}
|
|
}
|
|
// If we didn't match any executable sections, we likely
|
|
// have a non-zero third word in the OPD entry.
|
|
}
|
|
}
|
|
}
|
|
|
|
// Set up some symbols.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::do_define_standard_symbols(
|
|
Symbol_table* symtab,
|
|
Layout* layout)
|
|
{
|
|
if (size == 32)
|
|
{
|
|
// Define _GLOBAL_OFFSET_TABLE_ to ensure it isn't seen as
|
|
// undefined when scanning relocs (and thus requires
|
|
// non-relative dynamic relocs). The proper value will be
|
|
// updated later.
|
|
Symbol *gotsym = symtab->lookup("_GLOBAL_OFFSET_TABLE_", NULL);
|
|
if (gotsym != NULL && gotsym->is_undefined())
|
|
{
|
|
Target_powerpc<size, big_endian>* target =
|
|
static_cast<Target_powerpc<size, big_endian>*>(
|
|
parameters->sized_target<size, big_endian>());
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
|
|
Symbol_table::PREDEFINED,
|
|
got, 0, 0,
|
|
elfcpp::STT_OBJECT,
|
|
elfcpp::STB_LOCAL,
|
|
elfcpp::STV_HIDDEN, 0,
|
|
false, false);
|
|
}
|
|
|
|
// Define _SDA_BASE_ at the start of the .sdata section + 32768.
|
|
Symbol *sdasym = symtab->lookup("_SDA_BASE_", NULL);
|
|
if (sdasym != NULL && sdasym->is_undefined())
|
|
{
|
|
Output_data_space* sdata = new Output_data_space(4, "** sdata");
|
|
Output_section* os
|
|
= layout->add_output_section_data(".sdata", 0,
|
|
elfcpp::SHF_ALLOC
|
|
| elfcpp::SHF_WRITE,
|
|
sdata, ORDER_SMALL_DATA, false);
|
|
symtab->define_in_output_data("_SDA_BASE_", NULL,
|
|
Symbol_table::PREDEFINED,
|
|
os, 32768, 0, elfcpp::STT_OBJECT,
|
|
elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN,
|
|
0, false, false);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Define .TOC. as for 32-bit _GLOBAL_OFFSET_TABLE_
|
|
Symbol *gotsym = symtab->lookup(".TOC.", NULL);
|
|
if (gotsym != NULL && gotsym->is_undefined())
|
|
{
|
|
Target_powerpc<size, big_endian>* target =
|
|
static_cast<Target_powerpc<size, big_endian>*>(
|
|
parameters->sized_target<size, big_endian>());
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
symtab->define_in_output_data(".TOC.", NULL,
|
|
Symbol_table::PREDEFINED,
|
|
got, 0x8000, 0,
|
|
elfcpp::STT_OBJECT,
|
|
elfcpp::STB_LOCAL,
|
|
elfcpp::STV_HIDDEN, 0,
|
|
false, false);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Set up PowerPC target specific relobj.
|
|
|
|
template<int size, bool big_endian>
|
|
Object*
|
|
Target_powerpc<size, big_endian>::do_make_elf_object(
|
|
const std::string& name,
|
|
Input_file* input_file,
|
|
off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
|
|
{
|
|
int et = ehdr.get_e_type();
|
|
// ET_EXEC files are valid input for --just-symbols/-R,
|
|
// and we treat them as relocatable objects.
|
|
if (et == elfcpp::ET_REL
|
|
|| (et == elfcpp::ET_EXEC && input_file->just_symbols()))
|
|
{
|
|
Powerpc_relobj<size, big_endian>* obj =
|
|
new Powerpc_relobj<size, big_endian>(name, input_file, offset, ehdr);
|
|
obj->setup();
|
|
return obj;
|
|
}
|
|
else if (et == elfcpp::ET_DYN)
|
|
{
|
|
Powerpc_dynobj<size, big_endian>* obj =
|
|
new Powerpc_dynobj<size, big_endian>(name, input_file, offset, ehdr);
|
|
obj->setup();
|
|
return obj;
|
|
}
|
|
else
|
|
{
|
|
gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_got_powerpc : public Output_data_got<size, big_endian>
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
|
|
typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn;
|
|
|
|
Output_data_got_powerpc(Symbol_table* symtab, Layout* layout)
|
|
: Output_data_got<size, big_endian>(),
|
|
symtab_(symtab), layout_(layout),
|
|
header_ent_cnt_(size == 32 ? 3 : 1),
|
|
header_index_(size == 32 ? 0x2000 : 0)
|
|
{ }
|
|
|
|
// Override all the Output_data_got methods we use so as to first call
|
|
// reserve_ent().
|
|
bool
|
|
add_global(Symbol* gsym, unsigned int got_type)
|
|
{
|
|
this->reserve_ent();
|
|
return Output_data_got<size, big_endian>::add_global(gsym, got_type);
|
|
}
|
|
|
|
bool
|
|
add_global_plt(Symbol* gsym, unsigned int got_type)
|
|
{
|
|
this->reserve_ent();
|
|
return Output_data_got<size, big_endian>::add_global_plt(gsym, got_type);
|
|
}
|
|
|
|
bool
|
|
add_global_tls(Symbol* gsym, unsigned int got_type)
|
|
{ return this->add_global_plt(gsym, got_type); }
|
|
|
|
void
|
|
add_global_with_rel(Symbol* gsym, unsigned int got_type,
|
|
Output_data_reloc_generic* rel_dyn, unsigned int r_type)
|
|
{
|
|
this->reserve_ent();
|
|
Output_data_got<size, big_endian>::
|
|
add_global_with_rel(gsym, got_type, rel_dyn, r_type);
|
|
}
|
|
|
|
void
|
|
add_global_pair_with_rel(Symbol* gsym, unsigned int got_type,
|
|
Output_data_reloc_generic* rel_dyn,
|
|
unsigned int r_type_1, unsigned int r_type_2)
|
|
{
|
|
this->reserve_ent(2);
|
|
Output_data_got<size, big_endian>::
|
|
add_global_pair_with_rel(gsym, got_type, rel_dyn, r_type_1, r_type_2);
|
|
}
|
|
|
|
bool
|
|
add_local(Relobj* object, unsigned int sym_index, unsigned int got_type)
|
|
{
|
|
this->reserve_ent();
|
|
return Output_data_got<size, big_endian>::add_local(object, sym_index,
|
|
got_type);
|
|
}
|
|
|
|
bool
|
|
add_local_plt(Relobj* object, unsigned int sym_index, unsigned int got_type)
|
|
{
|
|
this->reserve_ent();
|
|
return Output_data_got<size, big_endian>::add_local_plt(object, sym_index,
|
|
got_type);
|
|
}
|
|
|
|
bool
|
|
add_local_tls(Relobj* object, unsigned int sym_index, unsigned int got_type)
|
|
{ return this->add_local_plt(object, sym_index, got_type); }
|
|
|
|
void
|
|
add_local_tls_pair(Relobj* object, unsigned int sym_index,
|
|
unsigned int got_type,
|
|
Output_data_reloc_generic* rel_dyn,
|
|
unsigned int r_type)
|
|
{
|
|
this->reserve_ent(2);
|
|
Output_data_got<size, big_endian>::
|
|
add_local_tls_pair(object, sym_index, got_type, rel_dyn, r_type);
|
|
}
|
|
|
|
unsigned int
|
|
add_constant(Valtype constant)
|
|
{
|
|
this->reserve_ent();
|
|
return Output_data_got<size, big_endian>::add_constant(constant);
|
|
}
|
|
|
|
unsigned int
|
|
add_constant_pair(Valtype c1, Valtype c2)
|
|
{
|
|
this->reserve_ent(2);
|
|
return Output_data_got<size, big_endian>::add_constant_pair(c1, c2);
|
|
}
|
|
|
|
// Offset of _GLOBAL_OFFSET_TABLE_.
|
|
unsigned int
|
|
g_o_t() const
|
|
{
|
|
return this->got_offset(this->header_index_);
|
|
}
|
|
|
|
// Offset of base used to access the GOT/TOC.
|
|
// The got/toc pointer reg will be set to this value.
|
|
Valtype
|
|
got_base_offset(const Powerpc_relobj<size, big_endian>* object) const
|
|
{
|
|
if (size == 32)
|
|
return this->g_o_t();
|
|
else
|
|
return (this->output_section()->address()
|
|
+ object->toc_base_offset()
|
|
- this->address());
|
|
}
|
|
|
|
// Ensure our GOT has a header.
|
|
void
|
|
set_final_data_size()
|
|
{
|
|
if (this->header_ent_cnt_ != 0)
|
|
this->make_header();
|
|
Output_data_got<size, big_endian>::set_final_data_size();
|
|
}
|
|
|
|
// First word of GOT header needs some values that are not
|
|
// handled by Output_data_got so poke them in here.
|
|
// For 32-bit, address of .dynamic, for 64-bit, address of TOCbase.
|
|
void
|
|
do_write(Output_file* of)
|
|
{
|
|
Valtype val = 0;
|
|
if (size == 32 && this->layout_->dynamic_data() != NULL)
|
|
val = this->layout_->dynamic_section()->address();
|
|
if (size == 64)
|
|
val = this->output_section()->address() + 0x8000;
|
|
this->replace_constant(this->header_index_, val);
|
|
Output_data_got<size, big_endian>::do_write(of);
|
|
}
|
|
|
|
private:
|
|
void
|
|
reserve_ent(unsigned int cnt = 1)
|
|
{
|
|
if (this->header_ent_cnt_ == 0)
|
|
return;
|
|
if (this->num_entries() + cnt > this->header_index_)
|
|
this->make_header();
|
|
}
|
|
|
|
void
|
|
make_header()
|
|
{
|
|
this->header_ent_cnt_ = 0;
|
|
this->header_index_ = this->num_entries();
|
|
if (size == 32)
|
|
{
|
|
Output_data_got<size, big_endian>::add_constant(0);
|
|
Output_data_got<size, big_endian>::add_constant(0);
|
|
Output_data_got<size, big_endian>::add_constant(0);
|
|
|
|
// Define _GLOBAL_OFFSET_TABLE_ at the header
|
|
Symbol *gotsym = this->symtab_->lookup("_GLOBAL_OFFSET_TABLE_", NULL);
|
|
if (gotsym != NULL)
|
|
{
|
|
Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(gotsym);
|
|
sym->set_value(this->g_o_t());
|
|
}
|
|
else
|
|
this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
|
|
Symbol_table::PREDEFINED,
|
|
this, this->g_o_t(), 0,
|
|
elfcpp::STT_OBJECT,
|
|
elfcpp::STB_LOCAL,
|
|
elfcpp::STV_HIDDEN, 0,
|
|
false, false);
|
|
}
|
|
else
|
|
Output_data_got<size, big_endian>::add_constant(0);
|
|
}
|
|
|
|
// Stashed pointers.
|
|
Symbol_table* symtab_;
|
|
Layout* layout_;
|
|
|
|
// GOT header size.
|
|
unsigned int header_ent_cnt_;
|
|
// GOT header index.
|
|
unsigned int header_index_;
|
|
};
|
|
|
|
// Get the GOT section, creating it if necessary.
|
|
|
|
template<int size, bool big_endian>
|
|
Output_data_got_powerpc<size, big_endian>*
|
|
Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab,
|
|
Layout* layout)
|
|
{
|
|
if (this->got_ == NULL)
|
|
{
|
|
gold_assert(symtab != NULL && layout != NULL);
|
|
|
|
this->got_
|
|
= new Output_data_got_powerpc<size, big_endian>(symtab, layout);
|
|
|
|
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
|
|
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
|
|
this->got_, ORDER_DATA, false);
|
|
}
|
|
|
|
return this->got_;
|
|
}
|
|
|
|
// Get the dynamic reloc section, creating it if necessary.
|
|
|
|
template<int size, bool big_endian>
|
|
typename Target_powerpc<size, big_endian>::Reloc_section*
|
|
Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout)
|
|
{
|
|
if (this->rela_dyn_ == NULL)
|
|
{
|
|
gold_assert(layout != NULL);
|
|
this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
|
|
layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
|
|
elfcpp::SHF_ALLOC, this->rela_dyn_,
|
|
ORDER_DYNAMIC_RELOCS, false);
|
|
}
|
|
return this->rela_dyn_;
|
|
}
|
|
|
|
// Similarly, but for ifunc symbols get the one for ifunc.
|
|
|
|
template<int size, bool big_endian>
|
|
typename Target_powerpc<size, big_endian>::Reloc_section*
|
|
Target_powerpc<size, big_endian>::rela_dyn_section(Symbol_table* symtab,
|
|
Layout* layout,
|
|
bool for_ifunc)
|
|
{
|
|
if (!for_ifunc)
|
|
return this->rela_dyn_section(layout);
|
|
|
|
if (this->iplt_ == NULL)
|
|
this->make_iplt_section(symtab, layout);
|
|
return this->iplt_->rel_plt();
|
|
}
|
|
|
|
class Stub_control
|
|
{
|
|
public:
|
|
// Determine the stub group size. The group size is the absolute
|
|
// value of the parameter --stub-group-size. If --stub-group-size
|
|
// is passed a negative value, we restrict stubs to be always before
|
|
// the stubbed branches.
|
|
Stub_control(int32_t size, bool no_size_errors)
|
|
: state_(NO_GROUP), stub_group_size_(abs(size)),
|
|
stub14_group_size_(abs(size) >> 10),
|
|
stubs_always_before_branch_(size < 0),
|
|
suppress_size_errors_(no_size_errors),
|
|
group_end_addr_(0), owner_(NULL), output_section_(NULL)
|
|
{
|
|
}
|
|
|
|
// Return true iff input section can be handled by current stub
|
|
// group.
|
|
bool
|
|
can_add_to_stub_group(Output_section* o,
|
|
const Output_section::Input_section* i,
|
|
bool has14);
|
|
|
|
const Output_section::Input_section*
|
|
owner()
|
|
{ return owner_; }
|
|
|
|
Output_section*
|
|
output_section()
|
|
{ return output_section_; }
|
|
|
|
void
|
|
set_output_and_owner(Output_section* o,
|
|
const Output_section::Input_section* i)
|
|
{
|
|
this->output_section_ = o;
|
|
this->owner_ = i;
|
|
}
|
|
|
|
private:
|
|
typedef enum
|
|
{
|
|
NO_GROUP,
|
|
FINDING_STUB_SECTION,
|
|
HAS_STUB_SECTION
|
|
} State;
|
|
|
|
State state_;
|
|
uint32_t stub_group_size_;
|
|
uint32_t stub14_group_size_;
|
|
bool stubs_always_before_branch_;
|
|
bool suppress_size_errors_;
|
|
uint64_t group_end_addr_;
|
|
const Output_section::Input_section* owner_;
|
|
Output_section* output_section_;
|
|
};
|
|
|
|
// Return true iff input section can be handled by current stub
|
|
// group.
|
|
|
|
bool
|
|
Stub_control::can_add_to_stub_group(Output_section* o,
|
|
const Output_section::Input_section* i,
|
|
bool has14)
|
|
{
|
|
uint32_t group_size
|
|
= has14 ? this->stub14_group_size_ : this->stub_group_size_;
|
|
bool whole_sec = o->order() == ORDER_INIT || o->order() == ORDER_FINI;
|
|
uint64_t this_size;
|
|
uint64_t start_addr = o->address();
|
|
|
|
if (whole_sec)
|
|
// .init and .fini sections are pasted together to form a single
|
|
// function. We can't be adding stubs in the middle of the function.
|
|
this_size = o->data_size();
|
|
else
|
|
{
|
|
start_addr += i->relobj()->output_section_offset(i->shndx());
|
|
this_size = i->data_size();
|
|
}
|
|
uint64_t end_addr = start_addr + this_size;
|
|
bool toobig = this_size > group_size;
|
|
|
|
if (toobig && !this->suppress_size_errors_)
|
|
gold_warning(_("%s:%s exceeds group size"),
|
|
i->relobj()->name().c_str(),
|
|
i->relobj()->section_name(i->shndx()).c_str());
|
|
|
|
if (this->state_ != HAS_STUB_SECTION
|
|
&& (!whole_sec || this->output_section_ != o)
|
|
&& (this->state_ == NO_GROUP
|
|
|| this->group_end_addr_ - end_addr < group_size))
|
|
{
|
|
this->owner_ = i;
|
|
this->output_section_ = o;
|
|
}
|
|
|
|
if (this->state_ == NO_GROUP)
|
|
{
|
|
this->state_ = FINDING_STUB_SECTION;
|
|
this->group_end_addr_ = end_addr;
|
|
}
|
|
else if (this->group_end_addr_ - start_addr < group_size)
|
|
;
|
|
// Adding this section would make the group larger than GROUP_SIZE.
|
|
else if (this->state_ == FINDING_STUB_SECTION
|
|
&& !this->stubs_always_before_branch_
|
|
&& !toobig)
|
|
{
|
|
// But wait, there's more! Input sections up to GROUP_SIZE
|
|
// bytes before the stub table can be handled by it too.
|
|
this->state_ = HAS_STUB_SECTION;
|
|
this->group_end_addr_ = end_addr;
|
|
}
|
|
else
|
|
{
|
|
this->state_ = NO_GROUP;
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Look over all the input sections, deciding where to place stubs.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::group_sections(Layout* layout,
|
|
const Task*,
|
|
bool no_size_errors)
|
|
{
|
|
Stub_control stub_control(this->stub_group_size_, no_size_errors);
|
|
|
|
// Group input sections and insert stub table
|
|
Stub_table_owner* table_owner = NULL;
|
|
std::vector<Stub_table_owner*> tables;
|
|
Layout::Section_list section_list;
|
|
layout->get_executable_sections(§ion_list);
|
|
std::stable_sort(section_list.begin(), section_list.end(), Sort_sections());
|
|
for (Layout::Section_list::reverse_iterator o = section_list.rbegin();
|
|
o != section_list.rend();
|
|
++o)
|
|
{
|
|
typedef Output_section::Input_section_list Input_section_list;
|
|
for (Input_section_list::const_reverse_iterator i
|
|
= (*o)->input_sections().rbegin();
|
|
i != (*o)->input_sections().rend();
|
|
++i)
|
|
{
|
|
if (i->is_input_section()
|
|
|| i->is_relaxed_input_section())
|
|
{
|
|
Powerpc_relobj<size, big_endian>* ppcobj = static_cast
|
|
<Powerpc_relobj<size, big_endian>*>(i->relobj());
|
|
bool has14 = ppcobj->has_14bit_branch(i->shndx());
|
|
if (!stub_control.can_add_to_stub_group(*o, &*i, has14))
|
|
{
|
|
table_owner->output_section = stub_control.output_section();
|
|
table_owner->owner = stub_control.owner();
|
|
stub_control.set_output_and_owner(*o, &*i);
|
|
table_owner = NULL;
|
|
}
|
|
if (table_owner == NULL)
|
|
{
|
|
table_owner = new Stub_table_owner;
|
|
tables.push_back(table_owner);
|
|
}
|
|
ppcobj->set_stub_table(i->shndx(), tables.size() - 1);
|
|
}
|
|
}
|
|
}
|
|
if (table_owner != NULL)
|
|
{
|
|
const Output_section::Input_section* i = stub_control.owner();
|
|
|
|
if (tables.size() >= 2 && tables[tables.size() - 2]->owner == i)
|
|
{
|
|
// Corner case. A new stub group was made for the first
|
|
// section (last one looked at here) for some reason, but
|
|
// the first section is already being used as the owner for
|
|
// a stub table for following sections. Force it into that
|
|
// stub group.
|
|
tables.pop_back();
|
|
delete table_owner;
|
|
Powerpc_relobj<size, big_endian>* ppcobj = static_cast
|
|
<Powerpc_relobj<size, big_endian>*>(i->relobj());
|
|
ppcobj->set_stub_table(i->shndx(), tables.size() - 1);
|
|
}
|
|
else
|
|
{
|
|
table_owner->output_section = stub_control.output_section();
|
|
table_owner->owner = i;
|
|
}
|
|
}
|
|
for (typename std::vector<Stub_table_owner*>::iterator t = tables.begin();
|
|
t != tables.end();
|
|
++t)
|
|
{
|
|
Stub_table<size, big_endian>* stub_table;
|
|
|
|
if ((*t)->owner->is_input_section())
|
|
stub_table = new Stub_table<size, big_endian>(this,
|
|
(*t)->output_section,
|
|
(*t)->owner);
|
|
else if ((*t)->owner->is_relaxed_input_section())
|
|
stub_table = static_cast<Stub_table<size, big_endian>*>(
|
|
(*t)->owner->relaxed_input_section());
|
|
else
|
|
gold_unreachable();
|
|
this->stub_tables_.push_back(stub_table);
|
|
delete *t;
|
|
}
|
|
}
|
|
|
|
static unsigned long
|
|
max_branch_delta (unsigned int r_type)
|
|
{
|
|
if (r_type == elfcpp::R_POWERPC_REL14
|
|
|| r_type == elfcpp::R_POWERPC_REL14_BRTAKEN
|
|
|| r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN)
|
|
return 1L << 15;
|
|
if (r_type == elfcpp::R_POWERPC_REL24
|
|
|| r_type == elfcpp::R_PPC_PLTREL24
|
|
|| r_type == elfcpp::R_PPC_LOCAL24PC)
|
|
return 1L << 25;
|
|
return 0;
|
|
}
|
|
|
|
// If this branch needs a plt call stub, or a long branch stub, make one.
|
|
|
|
template<int size, bool big_endian>
|
|
bool
|
|
Target_powerpc<size, big_endian>::Branch_info::make_stub(
|
|
Stub_table<size, big_endian>* stub_table,
|
|
Stub_table<size, big_endian>* ifunc_stub_table,
|
|
Symbol_table* symtab) const
|
|
{
|
|
Symbol* sym = this->object_->global_symbol(this->r_sym_);
|
|
if (sym != NULL && sym->is_forwarder())
|
|
sym = symtab->resolve_forwards(sym);
|
|
const Sized_symbol<size>* gsym = static_cast<const Sized_symbol<size>*>(sym);
|
|
Target_powerpc<size, big_endian>* target =
|
|
static_cast<Target_powerpc<size, big_endian>*>(
|
|
parameters->sized_target<size, big_endian>());
|
|
if (gsym != NULL
|
|
? gsym->use_plt_offset(Scan::get_reference_flags(this->r_type_, target))
|
|
: this->object_->local_has_plt_offset(this->r_sym_))
|
|
{
|
|
if (size == 64
|
|
&& gsym != NULL
|
|
&& target->abiversion() >= 2
|
|
&& !parameters->options().output_is_position_independent()
|
|
&& !is_branch_reloc(this->r_type_))
|
|
target->glink_section()->add_global_entry(gsym);
|
|
else
|
|
{
|
|
if (stub_table == NULL)
|
|
stub_table = this->object_->stub_table(this->shndx_);
|
|
if (stub_table == NULL)
|
|
{
|
|
// This is a ref from a data section to an ifunc symbol.
|
|
stub_table = ifunc_stub_table;
|
|
}
|
|
gold_assert(stub_table != NULL);
|
|
Address from = this->object_->get_output_section_offset(this->shndx_);
|
|
if (from != invalid_address)
|
|
from += (this->object_->output_section(this->shndx_)->address()
|
|
+ this->offset_);
|
|
if (gsym != NULL)
|
|
return stub_table->add_plt_call_entry(from,
|
|
this->object_, gsym,
|
|
this->r_type_, this->addend_);
|
|
else
|
|
return stub_table->add_plt_call_entry(from,
|
|
this->object_, this->r_sym_,
|
|
this->r_type_, this->addend_);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
unsigned long max_branch_offset = max_branch_delta(this->r_type_);
|
|
if (max_branch_offset == 0)
|
|
return true;
|
|
Address from = this->object_->get_output_section_offset(this->shndx_);
|
|
gold_assert(from != invalid_address);
|
|
from += (this->object_->output_section(this->shndx_)->address()
|
|
+ this->offset_);
|
|
Address to;
|
|
if (gsym != NULL)
|
|
{
|
|
switch (gsym->source())
|
|
{
|
|
case Symbol::FROM_OBJECT:
|
|
{
|
|
Object* symobj = gsym->object();
|
|
if (symobj->is_dynamic()
|
|
|| symobj->pluginobj() != NULL)
|
|
return true;
|
|
bool is_ordinary;
|
|
unsigned int shndx = gsym->shndx(&is_ordinary);
|
|
if (shndx == elfcpp::SHN_UNDEF)
|
|
return true;
|
|
}
|
|
break;
|
|
|
|
case Symbol::IS_UNDEFINED:
|
|
return true;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
Symbol_table::Compute_final_value_status status;
|
|
to = symtab->compute_final_value<size>(gsym, &status);
|
|
if (status != Symbol_table::CFVS_OK)
|
|
return true;
|
|
if (size == 64)
|
|
to += this->object_->ppc64_local_entry_offset(gsym);
|
|
}
|
|
else
|
|
{
|
|
const Symbol_value<size>* psymval
|
|
= this->object_->local_symbol(this->r_sym_);
|
|
Symbol_value<size> symval;
|
|
typedef Sized_relobj_file<size, big_endian> ObjType;
|
|
typename ObjType::Compute_final_local_value_status status
|
|
= this->object_->compute_final_local_value(this->r_sym_, psymval,
|
|
&symval, symtab);
|
|
if (status != ObjType::CFLV_OK
|
|
|| !symval.has_output_value())
|
|
return true;
|
|
to = symval.value(this->object_, 0);
|
|
if (size == 64)
|
|
to += this->object_->ppc64_local_entry_offset(this->r_sym_);
|
|
}
|
|
to += this->addend_;
|
|
if (stub_table == NULL)
|
|
stub_table = this->object_->stub_table(this->shndx_);
|
|
if (size == 64 && target->abiversion() < 2)
|
|
{
|
|
unsigned int dest_shndx;
|
|
to = target->symval_for_branch(symtab, to, gsym,
|
|
this->object_, &dest_shndx);
|
|
}
|
|
Address delta = to - from;
|
|
if (delta + max_branch_offset >= 2 * max_branch_offset)
|
|
{
|
|
if (stub_table == NULL)
|
|
{
|
|
gold_warning(_("%s:%s: branch in non-executable section,"
|
|
" no long branch stub for you"),
|
|
this->object_->name().c_str(),
|
|
this->object_->section_name(this->shndx_).c_str());
|
|
return true;
|
|
}
|
|
return stub_table->add_long_branch_entry(this->object_,
|
|
this->r_type_, from, to);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Relaxation hook. This is where we do stub generation.
|
|
|
|
template<int size, bool big_endian>
|
|
bool
|
|
Target_powerpc<size, big_endian>::do_relax(int pass,
|
|
const Input_objects*,
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
const Task* task)
|
|
{
|
|
unsigned int prev_brlt_size = 0;
|
|
if (pass == 1)
|
|
{
|
|
bool thread_safe
|
|
= this->abiversion() < 2 && parameters->options().plt_thread_safe();
|
|
if (size == 64
|
|
&& this->abiversion() < 2
|
|
&& !thread_safe
|
|
&& !parameters->options().user_set_plt_thread_safe())
|
|
{
|
|
static const char* const thread_starter[] =
|
|
{
|
|
"pthread_create",
|
|
/* libstdc++ */
|
|
"_ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEE",
|
|
/* librt */
|
|
"aio_init", "aio_read", "aio_write", "aio_fsync", "lio_listio",
|
|
"mq_notify", "create_timer",
|
|
/* libanl */
|
|
"getaddrinfo_a",
|
|
/* libgomp */
|
|
"GOMP_parallel",
|
|
"GOMP_parallel_start",
|
|
"GOMP_parallel_loop_static",
|
|
"GOMP_parallel_loop_static_start",
|
|
"GOMP_parallel_loop_dynamic",
|
|
"GOMP_parallel_loop_dynamic_start",
|
|
"GOMP_parallel_loop_guided",
|
|
"GOMP_parallel_loop_guided_start",
|
|
"GOMP_parallel_loop_runtime",
|
|
"GOMP_parallel_loop_runtime_start",
|
|
"GOMP_parallel_sections",
|
|
"GOMP_parallel_sections_start",
|
|
/* libgo */
|
|
"__go_go",
|
|
};
|
|
|
|
if (parameters->options().shared())
|
|
thread_safe = true;
|
|
else
|
|
{
|
|
for (unsigned int i = 0;
|
|
i < sizeof(thread_starter) / sizeof(thread_starter[0]);
|
|
i++)
|
|
{
|
|
Symbol* sym = symtab->lookup(thread_starter[i], NULL);
|
|
thread_safe = (sym != NULL
|
|
&& sym->in_reg()
|
|
&& sym->in_real_elf());
|
|
if (thread_safe)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
this->plt_thread_safe_ = thread_safe;
|
|
}
|
|
|
|
if (pass == 1)
|
|
{
|
|
this->stub_group_size_ = parameters->options().stub_group_size();
|
|
bool no_size_errors = true;
|
|
if (this->stub_group_size_ == 1)
|
|
this->stub_group_size_ = 0x1c00000;
|
|
else if (this->stub_group_size_ == -1)
|
|
this->stub_group_size_ = -0x1e00000;
|
|
else
|
|
no_size_errors = false;
|
|
this->group_sections(layout, task, no_size_errors);
|
|
}
|
|
else if (this->relax_failed_ && this->relax_fail_count_ < 3)
|
|
{
|
|
this->branch_lookup_table_.clear();
|
|
for (typename Stub_tables::iterator p = this->stub_tables_.begin();
|
|
p != this->stub_tables_.end();
|
|
++p)
|
|
{
|
|
(*p)->clear_stubs(true);
|
|
}
|
|
this->stub_tables_.clear();
|
|
this->stub_group_size_ = this->stub_group_size_ / 4 * 3;
|
|
gold_info(_("%s: stub group size is too large; retrying with %d"),
|
|
program_name, this->stub_group_size_);
|
|
this->group_sections(layout, task, true);
|
|
}
|
|
|
|
// We need address of stub tables valid for make_stub.
|
|
for (typename Stub_tables::iterator p = this->stub_tables_.begin();
|
|
p != this->stub_tables_.end();
|
|
++p)
|
|
{
|
|
const Powerpc_relobj<size, big_endian>* object
|
|
= static_cast<const Powerpc_relobj<size, big_endian>*>((*p)->relobj());
|
|
Address off = object->get_output_section_offset((*p)->shndx());
|
|
gold_assert(off != invalid_address);
|
|
Output_section* os = (*p)->output_section();
|
|
(*p)->set_address_and_size(os, off);
|
|
}
|
|
|
|
if (pass != 1)
|
|
{
|
|
// Clear plt call stubs, long branch stubs and branch lookup table.
|
|
prev_brlt_size = this->branch_lookup_table_.size();
|
|
this->branch_lookup_table_.clear();
|
|
for (typename Stub_tables::iterator p = this->stub_tables_.begin();
|
|
p != this->stub_tables_.end();
|
|
++p)
|
|
{
|
|
(*p)->clear_stubs(false);
|
|
}
|
|
}
|
|
|
|
// Build all the stubs.
|
|
this->relax_failed_ = false;
|
|
Stub_table<size, big_endian>* ifunc_stub_table
|
|
= this->stub_tables_.size() == 0 ? NULL : this->stub_tables_[0];
|
|
Stub_table<size, big_endian>* one_stub_table
|
|
= this->stub_tables_.size() != 1 ? NULL : ifunc_stub_table;
|
|
for (typename Branches::const_iterator b = this->branch_info_.begin();
|
|
b != this->branch_info_.end();
|
|
b++)
|
|
{
|
|
if (!b->make_stub(one_stub_table, ifunc_stub_table, symtab)
|
|
&& !this->relax_failed_)
|
|
{
|
|
this->relax_failed_ = true;
|
|
this->relax_fail_count_++;
|
|
if (this->relax_fail_count_ < 3)
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Did anything change size?
|
|
unsigned int num_huge_branches = this->branch_lookup_table_.size();
|
|
bool again = num_huge_branches != prev_brlt_size;
|
|
if (size == 64 && num_huge_branches != 0)
|
|
this->make_brlt_section(layout);
|
|
if (size == 64 && again)
|
|
this->brlt_section_->set_current_size(num_huge_branches);
|
|
|
|
typedef Unordered_set<Output_section*> Output_sections;
|
|
Output_sections os_need_update;
|
|
for (typename Stub_tables::iterator p = this->stub_tables_.begin();
|
|
p != this->stub_tables_.end();
|
|
++p)
|
|
{
|
|
if ((*p)->size_update())
|
|
{
|
|
again = true;
|
|
(*p)->add_eh_frame(layout);
|
|
os_need_update.insert((*p)->output_section());
|
|
}
|
|
}
|
|
|
|
// Set output section offsets for all input sections in an output
|
|
// section that just changed size. Anything past the stubs will
|
|
// need updating.
|
|
for (typename Output_sections::iterator p = os_need_update.begin();
|
|
p != os_need_update.end();
|
|
p++)
|
|
{
|
|
Output_section* os = *p;
|
|
Address off = 0;
|
|
typedef Output_section::Input_section_list Input_section_list;
|
|
for (Input_section_list::const_iterator i = os->input_sections().begin();
|
|
i != os->input_sections().end();
|
|
++i)
|
|
{
|
|
off = align_address(off, i->addralign());
|
|
if (i->is_input_section() || i->is_relaxed_input_section())
|
|
i->relobj()->set_section_offset(i->shndx(), off);
|
|
if (i->is_relaxed_input_section())
|
|
{
|
|
Stub_table<size, big_endian>* stub_table
|
|
= static_cast<Stub_table<size, big_endian>*>(
|
|
i->relaxed_input_section());
|
|
off += stub_table->set_address_and_size(os, off);
|
|
}
|
|
else
|
|
off += i->data_size();
|
|
}
|
|
// If .branch_lt is part of this output section, then we have
|
|
// just done the offset adjustment.
|
|
os->clear_section_offsets_need_adjustment();
|
|
}
|
|
|
|
if (size == 64
|
|
&& !again
|
|
&& num_huge_branches != 0
|
|
&& parameters->options().output_is_position_independent())
|
|
{
|
|
// Fill in the BRLT relocs.
|
|
this->brlt_section_->reset_brlt_sizes();
|
|
for (typename Branch_lookup_table::const_iterator p
|
|
= this->branch_lookup_table_.begin();
|
|
p != this->branch_lookup_table_.end();
|
|
++p)
|
|
{
|
|
this->brlt_section_->add_reloc(p->first, p->second);
|
|
}
|
|
this->brlt_section_->finalize_brlt_sizes();
|
|
}
|
|
return again;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::do_plt_fde_location(const Output_data* plt,
|
|
unsigned char* oview,
|
|
uint64_t* paddress,
|
|
off_t* plen) const
|
|
{
|
|
uint64_t address = plt->address();
|
|
off_t len = plt->data_size();
|
|
|
|
if (plt == this->glink_)
|
|
{
|
|
// See Output_data_glink::do_write() for glink contents.
|
|
if (len == 0)
|
|
{
|
|
gold_assert(parameters->doing_static_link());
|
|
// Static linking may need stubs, to support ifunc and long
|
|
// branches. We need to create an output section for
|
|
// .eh_frame early in the link process, to have a place to
|
|
// attach stub .eh_frame info. We also need to have
|
|
// registered a CIE that matches the stub CIE. Both of
|
|
// these requirements are satisfied by creating an FDE and
|
|
// CIE for .glink, even though static linking will leave
|
|
// .glink zero length.
|
|
// ??? Hopefully generating an FDE with a zero address range
|
|
// won't confuse anything that consumes .eh_frame info.
|
|
}
|
|
else if (size == 64)
|
|
{
|
|
// There is one word before __glink_PLTresolve
|
|
address += 8;
|
|
len -= 8;
|
|
}
|
|
else if (parameters->options().output_is_position_independent())
|
|
{
|
|
// There are two FDEs for a position independent glink.
|
|
// The first covers the branch table, the second
|
|
// __glink_PLTresolve at the end of glink.
|
|
off_t resolve_size = this->glink_->pltresolve_size;
|
|
if (oview[9] == elfcpp::DW_CFA_nop)
|
|
len -= resolve_size;
|
|
else
|
|
{
|
|
address += len - resolve_size;
|
|
len = resolve_size;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Must be a stub table.
|
|
const Stub_table<size, big_endian>* stub_table
|
|
= static_cast<const Stub_table<size, big_endian>*>(plt);
|
|
uint64_t stub_address = stub_table->stub_address();
|
|
len -= stub_address - address;
|
|
address = stub_address;
|
|
}
|
|
|
|
*paddress = address;
|
|
*plen = len;
|
|
}
|
|
|
|
// A class to handle the PLT data.
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_plt_powerpc : public Output_section_data_build
|
|
{
|
|
public:
|
|
typedef Output_data_reloc<elfcpp::SHT_RELA, true,
|
|
size, big_endian> Reloc_section;
|
|
|
|
Output_data_plt_powerpc(Target_powerpc<size, big_endian>* targ,
|
|
Reloc_section* plt_rel,
|
|
const char* name)
|
|
: Output_section_data_build(size == 32 ? 4 : 8),
|
|
rel_(plt_rel),
|
|
targ_(targ),
|
|
name_(name)
|
|
{ }
|
|
|
|
// Add an entry to the PLT.
|
|
void
|
|
add_entry(Symbol*);
|
|
|
|
void
|
|
add_ifunc_entry(Symbol*);
|
|
|
|
void
|
|
add_local_ifunc_entry(Sized_relobj_file<size, big_endian>*, unsigned int);
|
|
|
|
// Return the .rela.plt section data.
|
|
Reloc_section*
|
|
rel_plt() const
|
|
{
|
|
return this->rel_;
|
|
}
|
|
|
|
// Return the number of PLT entries.
|
|
unsigned int
|
|
entry_count() const
|
|
{
|
|
if (this->current_data_size() == 0)
|
|
return 0;
|
|
return ((this->current_data_size() - this->first_plt_entry_offset())
|
|
/ this->plt_entry_size());
|
|
}
|
|
|
|
protected:
|
|
void
|
|
do_adjust_output_section(Output_section* os)
|
|
{
|
|
os->set_entsize(0);
|
|
}
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, this->name_); }
|
|
|
|
private:
|
|
// Return the offset of the first non-reserved PLT entry.
|
|
unsigned int
|
|
first_plt_entry_offset() const
|
|
{
|
|
// IPLT has no reserved entry.
|
|
if (this->name_[3] == 'I')
|
|
return 0;
|
|
return this->targ_->first_plt_entry_offset();
|
|
}
|
|
|
|
// Return the size of each PLT entry.
|
|
unsigned int
|
|
plt_entry_size() const
|
|
{
|
|
return this->targ_->plt_entry_size();
|
|
}
|
|
|
|
// Write out the PLT data.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// The reloc section.
|
|
Reloc_section* rel_;
|
|
// Allows access to .glink for do_write.
|
|
Target_powerpc<size, big_endian>* targ_;
|
|
// What to report in map file.
|
|
const char *name_;
|
|
};
|
|
|
|
// Add an entry to the PLT.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
|
|
{
|
|
if (!gsym->has_plt_offset())
|
|
{
|
|
section_size_type off = this->current_data_size();
|
|
if (off == 0)
|
|
off += this->first_plt_entry_offset();
|
|
gsym->set_plt_offset(off);
|
|
gsym->set_needs_dynsym_entry();
|
|
unsigned int dynrel = elfcpp::R_POWERPC_JMP_SLOT;
|
|
this->rel_->add_global(gsym, dynrel, this, off, 0);
|
|
off += this->plt_entry_size();
|
|
this->set_current_data_size(off);
|
|
}
|
|
}
|
|
|
|
// Add an entry for a global ifunc symbol that resolves locally, to the IPLT.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_plt_powerpc<size, big_endian>::add_ifunc_entry(Symbol* gsym)
|
|
{
|
|
if (!gsym->has_plt_offset())
|
|
{
|
|
section_size_type off = this->current_data_size();
|
|
gsym->set_plt_offset(off);
|
|
unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE;
|
|
if (size == 64 && this->targ_->abiversion() < 2)
|
|
dynrel = elfcpp::R_PPC64_JMP_IREL;
|
|
this->rel_->add_symbolless_global_addend(gsym, dynrel, this, off, 0);
|
|
off += this->plt_entry_size();
|
|
this->set_current_data_size(off);
|
|
}
|
|
}
|
|
|
|
// Add an entry for a local ifunc symbol to the IPLT.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_plt_powerpc<size, big_endian>::add_local_ifunc_entry(
|
|
Sized_relobj_file<size, big_endian>* relobj,
|
|
unsigned int local_sym_index)
|
|
{
|
|
if (!relobj->local_has_plt_offset(local_sym_index))
|
|
{
|
|
section_size_type off = this->current_data_size();
|
|
relobj->set_local_plt_offset(local_sym_index, off);
|
|
unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE;
|
|
if (size == 64 && this->targ_->abiversion() < 2)
|
|
dynrel = elfcpp::R_PPC64_JMP_IREL;
|
|
this->rel_->add_symbolless_local_addend(relobj, local_sym_index, dynrel,
|
|
this, off, 0);
|
|
off += this->plt_entry_size();
|
|
this->set_current_data_size(off);
|
|
}
|
|
}
|
|
|
|
static const uint32_t add_0_11_11 = 0x7c0b5a14;
|
|
static const uint32_t add_2_2_11 = 0x7c425a14;
|
|
static const uint32_t add_3_3_2 = 0x7c631214;
|
|
static const uint32_t add_3_3_13 = 0x7c636a14;
|
|
static const uint32_t add_11_0_11 = 0x7d605a14;
|
|
static const uint32_t add_11_2_11 = 0x7d625a14;
|
|
static const uint32_t add_11_11_2 = 0x7d6b1214;
|
|
static const uint32_t addi_0_12 = 0x380c0000;
|
|
static const uint32_t addi_2_2 = 0x38420000;
|
|
static const uint32_t addi_3_3 = 0x38630000;
|
|
static const uint32_t addi_11_11 = 0x396b0000;
|
|
static const uint32_t addi_12_12 = 0x398c0000;
|
|
static const uint32_t addis_0_2 = 0x3c020000;
|
|
static const uint32_t addis_0_13 = 0x3c0d0000;
|
|
static const uint32_t addis_3_2 = 0x3c620000;
|
|
static const uint32_t addis_3_13 = 0x3c6d0000;
|
|
static const uint32_t addis_11_2 = 0x3d620000;
|
|
static const uint32_t addis_11_11 = 0x3d6b0000;
|
|
static const uint32_t addis_11_30 = 0x3d7e0000;
|
|
static const uint32_t addis_12_2 = 0x3d820000;
|
|
static const uint32_t addis_12_12 = 0x3d8c0000;
|
|
static const uint32_t b = 0x48000000;
|
|
static const uint32_t bcl_20_31 = 0x429f0005;
|
|
static const uint32_t bctr = 0x4e800420;
|
|
static const uint32_t blr = 0x4e800020;
|
|
static const uint32_t bnectr_p4 = 0x4ce20420;
|
|
static const uint32_t cmpldi_2_0 = 0x28220000;
|
|
static const uint32_t cror_15_15_15 = 0x4def7b82;
|
|
static const uint32_t cror_31_31_31 = 0x4ffffb82;
|
|
static const uint32_t ld_0_1 = 0xe8010000;
|
|
static const uint32_t ld_0_12 = 0xe80c0000;
|
|
static const uint32_t ld_2_1 = 0xe8410000;
|
|
static const uint32_t ld_2_2 = 0xe8420000;
|
|
static const uint32_t ld_2_11 = 0xe84b0000;
|
|
static const uint32_t ld_11_2 = 0xe9620000;
|
|
static const uint32_t ld_11_11 = 0xe96b0000;
|
|
static const uint32_t ld_12_2 = 0xe9820000;
|
|
static const uint32_t ld_12_11 = 0xe98b0000;
|
|
static const uint32_t ld_12_12 = 0xe98c0000;
|
|
static const uint32_t lfd_0_1 = 0xc8010000;
|
|
static const uint32_t li_0_0 = 0x38000000;
|
|
static const uint32_t li_12_0 = 0x39800000;
|
|
static const uint32_t lis_0_0 = 0x3c000000;
|
|
static const uint32_t lis_11 = 0x3d600000;
|
|
static const uint32_t lis_12 = 0x3d800000;
|
|
static const uint32_t lvx_0_12_0 = 0x7c0c00ce;
|
|
static const uint32_t lwz_0_12 = 0x800c0000;
|
|
static const uint32_t lwz_11_11 = 0x816b0000;
|
|
static const uint32_t lwz_11_30 = 0x817e0000;
|
|
static const uint32_t lwz_12_12 = 0x818c0000;
|
|
static const uint32_t lwzu_0_12 = 0x840c0000;
|
|
static const uint32_t mflr_0 = 0x7c0802a6;
|
|
static const uint32_t mflr_11 = 0x7d6802a6;
|
|
static const uint32_t mflr_12 = 0x7d8802a6;
|
|
static const uint32_t mtctr_0 = 0x7c0903a6;
|
|
static const uint32_t mtctr_11 = 0x7d6903a6;
|
|
static const uint32_t mtctr_12 = 0x7d8903a6;
|
|
static const uint32_t mtlr_0 = 0x7c0803a6;
|
|
static const uint32_t mtlr_12 = 0x7d8803a6;
|
|
static const uint32_t nop = 0x60000000;
|
|
static const uint32_t ori_0_0_0 = 0x60000000;
|
|
static const uint32_t srdi_0_0_2 = 0x7800f082;
|
|
static const uint32_t std_0_1 = 0xf8010000;
|
|
static const uint32_t std_0_12 = 0xf80c0000;
|
|
static const uint32_t std_2_1 = 0xf8410000;
|
|
static const uint32_t stfd_0_1 = 0xd8010000;
|
|
static const uint32_t stvx_0_12_0 = 0x7c0c01ce;
|
|
static const uint32_t sub_11_11_12 = 0x7d6c5850;
|
|
static const uint32_t sub_12_12_11 = 0x7d8b6050;
|
|
static const uint32_t xor_2_12_12 = 0x7d826278;
|
|
static const uint32_t xor_11_12_12 = 0x7d8b6278;
|
|
|
|
// Write out the PLT.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
|
|
{
|
|
if (size == 32 && this->name_[3] != 'I')
|
|
{
|
|
const section_size_type offset = this->offset();
|
|
const section_size_type oview_size
|
|
= convert_to_section_size_type(this->data_size());
|
|
unsigned char* const oview = of->get_output_view(offset, oview_size);
|
|
unsigned char* pov = oview;
|
|
unsigned char* endpov = oview + oview_size;
|
|
|
|
// The address of the .glink branch table
|
|
const Output_data_glink<size, big_endian>* glink
|
|
= this->targ_->glink_section();
|
|
elfcpp::Elf_types<32>::Elf_Addr branch_tab = glink->address();
|
|
|
|
while (pov < endpov)
|
|
{
|
|
elfcpp::Swap<32, big_endian>::writeval(pov, branch_tab);
|
|
pov += 4;
|
|
branch_tab += 4;
|
|
}
|
|
|
|
of->write_output_view(offset, oview_size, oview);
|
|
}
|
|
}
|
|
|
|
// Create the PLT section.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::make_plt_section(Symbol_table* symtab,
|
|
Layout* layout)
|
|
{
|
|
if (this->plt_ == NULL)
|
|
{
|
|
if (this->got_ == NULL)
|
|
this->got_section(symtab, layout);
|
|
|
|
if (this->glink_ == NULL)
|
|
make_glink_section(layout);
|
|
|
|
// Ensure that .rela.dyn always appears before .rela.plt This is
|
|
// necessary due to how, on PowerPC and some other targets, .rela.dyn
|
|
// needs to include .rela.plt in its range.
|
|
this->rela_dyn_section(layout);
|
|
|
|
Reloc_section* plt_rel = new Reloc_section(false);
|
|
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
|
|
elfcpp::SHF_ALLOC, plt_rel,
|
|
ORDER_DYNAMIC_PLT_RELOCS, false);
|
|
this->plt_
|
|
= new Output_data_plt_powerpc<size, big_endian>(this, plt_rel,
|
|
"** PLT");
|
|
layout->add_output_section_data(".plt",
|
|
(size == 32
|
|
? elfcpp::SHT_PROGBITS
|
|
: elfcpp::SHT_NOBITS),
|
|
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
|
|
this->plt_,
|
|
(size == 32
|
|
? ORDER_SMALL_DATA
|
|
: ORDER_SMALL_BSS),
|
|
false);
|
|
}
|
|
}
|
|
|
|
// Create the IPLT section.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::make_iplt_section(Symbol_table* symtab,
|
|
Layout* layout)
|
|
{
|
|
if (this->iplt_ == NULL)
|
|
{
|
|
this->make_plt_section(symtab, layout);
|
|
|
|
Reloc_section* iplt_rel = new Reloc_section(false);
|
|
this->rela_dyn_->output_section()->add_output_section_data(iplt_rel);
|
|
this->iplt_
|
|
= new Output_data_plt_powerpc<size, big_endian>(this, iplt_rel,
|
|
"** IPLT");
|
|
this->plt_->output_section()->add_output_section_data(this->iplt_);
|
|
}
|
|
}
|
|
|
|
// A section for huge long branch addresses, similar to plt section.
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_brlt_powerpc : public Output_section_data_build
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
typedef Output_data_reloc<elfcpp::SHT_RELA, true,
|
|
size, big_endian> Reloc_section;
|
|
|
|
Output_data_brlt_powerpc(Target_powerpc<size, big_endian>* targ,
|
|
Reloc_section* brlt_rel)
|
|
: Output_section_data_build(size == 32 ? 4 : 8),
|
|
rel_(brlt_rel),
|
|
targ_(targ)
|
|
{ }
|
|
|
|
void
|
|
reset_brlt_sizes()
|
|
{
|
|
this->reset_data_size();
|
|
this->rel_->reset_data_size();
|
|
}
|
|
|
|
void
|
|
finalize_brlt_sizes()
|
|
{
|
|
this->finalize_data_size();
|
|
this->rel_->finalize_data_size();
|
|
}
|
|
|
|
// Add a reloc for an entry in the BRLT.
|
|
void
|
|
add_reloc(Address to, unsigned int off)
|
|
{ this->rel_->add_relative(elfcpp::R_POWERPC_RELATIVE, this, off, to); }
|
|
|
|
// Update section and reloc section size.
|
|
void
|
|
set_current_size(unsigned int num_branches)
|
|
{
|
|
this->reset_address_and_file_offset();
|
|
this->set_current_data_size(num_branches * 16);
|
|
this->finalize_data_size();
|
|
Output_section* os = this->output_section();
|
|
os->set_section_offsets_need_adjustment();
|
|
if (this->rel_ != NULL)
|
|
{
|
|
unsigned int reloc_size
|
|
= Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;
|
|
this->rel_->reset_address_and_file_offset();
|
|
this->rel_->set_current_data_size(num_branches * reloc_size);
|
|
this->rel_->finalize_data_size();
|
|
Output_section* os = this->rel_->output_section();
|
|
os->set_section_offsets_need_adjustment();
|
|
}
|
|
}
|
|
|
|
protected:
|
|
void
|
|
do_adjust_output_section(Output_section* os)
|
|
{
|
|
os->set_entsize(0);
|
|
}
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, "** BRLT"); }
|
|
|
|
private:
|
|
// Write out the BRLT data.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// The reloc section.
|
|
Reloc_section* rel_;
|
|
Target_powerpc<size, big_endian>* targ_;
|
|
};
|
|
|
|
// Make the branch lookup table section.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::make_brlt_section(Layout* layout)
|
|
{
|
|
if (size == 64 && this->brlt_section_ == NULL)
|
|
{
|
|
Reloc_section* brlt_rel = NULL;
|
|
bool is_pic = parameters->options().output_is_position_independent();
|
|
if (is_pic)
|
|
{
|
|
// When PIC we can't fill in .branch_lt (like .plt it can be
|
|
// a bss style section) but must initialise at runtime via
|
|
// dynamic relocats.
|
|
this->rela_dyn_section(layout);
|
|
brlt_rel = new Reloc_section(false);
|
|
this->rela_dyn_->output_section()->add_output_section_data(brlt_rel);
|
|
}
|
|
this->brlt_section_
|
|
= new Output_data_brlt_powerpc<size, big_endian>(this, brlt_rel);
|
|
if (this->plt_ && is_pic)
|
|
this->plt_->output_section()
|
|
->add_output_section_data(this->brlt_section_);
|
|
else
|
|
layout->add_output_section_data(".branch_lt",
|
|
(is_pic ? elfcpp::SHT_NOBITS
|
|
: elfcpp::SHT_PROGBITS),
|
|
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
|
|
this->brlt_section_,
|
|
(is_pic ? ORDER_SMALL_BSS
|
|
: ORDER_SMALL_DATA),
|
|
false);
|
|
}
|
|
}
|
|
|
|
// Write out .branch_lt when non-PIC.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_brlt_powerpc<size, big_endian>::do_write(Output_file* of)
|
|
{
|
|
if (size == 64 && !parameters->options().output_is_position_independent())
|
|
{
|
|
const section_size_type offset = this->offset();
|
|
const section_size_type oview_size
|
|
= convert_to_section_size_type(this->data_size());
|
|
unsigned char* const oview = of->get_output_view(offset, oview_size);
|
|
|
|
this->targ_->write_branch_lookup_table(oview);
|
|
of->write_output_view(offset, oview_size, oview);
|
|
}
|
|
}
|
|
|
|
static inline uint32_t
|
|
l(uint32_t a)
|
|
{
|
|
return a & 0xffff;
|
|
}
|
|
|
|
static inline uint32_t
|
|
hi(uint32_t a)
|
|
{
|
|
return l(a >> 16);
|
|
}
|
|
|
|
static inline uint32_t
|
|
ha(uint32_t a)
|
|
{
|
|
return hi(a + 0x8000);
|
|
}
|
|
|
|
template<int size>
|
|
struct Eh_cie
|
|
{
|
|
static const unsigned char eh_frame_cie[12];
|
|
};
|
|
|
|
template<int size>
|
|
const unsigned char Eh_cie<size>::eh_frame_cie[] =
|
|
{
|
|
1, // CIE version.
|
|
'z', 'R', 0, // Augmentation string.
|
|
4, // Code alignment.
|
|
0x80 - size / 8 , // Data alignment.
|
|
65, // RA reg.
|
|
1, // Augmentation size.
|
|
(elfcpp::DW_EH_PE_pcrel
|
|
| elfcpp::DW_EH_PE_sdata4), // FDE encoding.
|
|
elfcpp::DW_CFA_def_cfa, 1, 0 // def_cfa: r1 offset 0.
|
|
};
|
|
|
|
// Describe __glink_PLTresolve use of LR, 64-bit version ABIv1.
|
|
static const unsigned char glink_eh_frame_fde_64v1[] =
|
|
{
|
|
0, 0, 0, 0, // Replaced with offset to .glink.
|
|
0, 0, 0, 0, // Replaced with size of .glink.
|
|
0, // Augmentation size.
|
|
elfcpp::DW_CFA_advance_loc + 1,
|
|
elfcpp::DW_CFA_register, 65, 12,
|
|
elfcpp::DW_CFA_advance_loc + 4,
|
|
elfcpp::DW_CFA_restore_extended, 65
|
|
};
|
|
|
|
// Describe __glink_PLTresolve use of LR, 64-bit version ABIv2.
|
|
static const unsigned char glink_eh_frame_fde_64v2[] =
|
|
{
|
|
0, 0, 0, 0, // Replaced with offset to .glink.
|
|
0, 0, 0, 0, // Replaced with size of .glink.
|
|
0, // Augmentation size.
|
|
elfcpp::DW_CFA_advance_loc + 1,
|
|
elfcpp::DW_CFA_register, 65, 0,
|
|
elfcpp::DW_CFA_advance_loc + 4,
|
|
elfcpp::DW_CFA_restore_extended, 65
|
|
};
|
|
|
|
// Describe __glink_PLTresolve use of LR, 32-bit version.
|
|
static const unsigned char glink_eh_frame_fde_32[] =
|
|
{
|
|
0, 0, 0, 0, // Replaced with offset to .glink.
|
|
0, 0, 0, 0, // Replaced with size of .glink.
|
|
0, // Augmentation size.
|
|
elfcpp::DW_CFA_advance_loc + 2,
|
|
elfcpp::DW_CFA_register, 65, 0,
|
|
elfcpp::DW_CFA_advance_loc + 4,
|
|
elfcpp::DW_CFA_restore_extended, 65
|
|
};
|
|
|
|
static const unsigned char default_fde[] =
|
|
{
|
|
0, 0, 0, 0, // Replaced with offset to stubs.
|
|
0, 0, 0, 0, // Replaced with size of stubs.
|
|
0, // Augmentation size.
|
|
elfcpp::DW_CFA_nop, // Pad.
|
|
elfcpp::DW_CFA_nop,
|
|
elfcpp::DW_CFA_nop
|
|
};
|
|
|
|
template<bool big_endian>
|
|
static inline void
|
|
write_insn(unsigned char* p, uint32_t v)
|
|
{
|
|
elfcpp::Swap<32, big_endian>::writeval(p, v);
|
|
}
|
|
|
|
// Stub_table holds information about plt and long branch stubs.
|
|
// Stubs are built in an area following some input section determined
|
|
// by group_sections(). This input section is converted to a relaxed
|
|
// input section allowing it to be resized to accommodate the stubs
|
|
|
|
template<int size, bool big_endian>
|
|
class Stub_table : public Output_relaxed_input_section
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
static const Address invalid_address = static_cast<Address>(0) - 1;
|
|
|
|
Stub_table(Target_powerpc<size, big_endian>* targ,
|
|
Output_section* output_section,
|
|
const Output_section::Input_section* owner)
|
|
: Output_relaxed_input_section(owner->relobj(), owner->shndx(),
|
|
owner->relobj()
|
|
->section_addralign(owner->shndx())),
|
|
targ_(targ), plt_call_stubs_(), long_branch_stubs_(),
|
|
orig_data_size_(owner->current_data_size()),
|
|
plt_size_(0), last_plt_size_(0),
|
|
branch_size_(0), last_branch_size_(0), eh_frame_added_(false)
|
|
{
|
|
this->set_output_section(output_section);
|
|
|
|
std::vector<Output_relaxed_input_section*> new_relaxed;
|
|
new_relaxed.push_back(this);
|
|
output_section->convert_input_sections_to_relaxed_sections(new_relaxed);
|
|
}
|
|
|
|
// Add a plt call stub.
|
|
bool
|
|
add_plt_call_entry(Address,
|
|
const Sized_relobj_file<size, big_endian>*,
|
|
const Symbol*,
|
|
unsigned int,
|
|
Address);
|
|
|
|
bool
|
|
add_plt_call_entry(Address,
|
|
const Sized_relobj_file<size, big_endian>*,
|
|
unsigned int,
|
|
unsigned int,
|
|
Address);
|
|
|
|
// Find a given plt call stub.
|
|
Address
|
|
find_plt_call_entry(const Symbol*) const;
|
|
|
|
Address
|
|
find_plt_call_entry(const Sized_relobj_file<size, big_endian>*,
|
|
unsigned int) const;
|
|
|
|
Address
|
|
find_plt_call_entry(const Sized_relobj_file<size, big_endian>*,
|
|
const Symbol*,
|
|
unsigned int,
|
|
Address) const;
|
|
|
|
Address
|
|
find_plt_call_entry(const Sized_relobj_file<size, big_endian>*,
|
|
unsigned int,
|
|
unsigned int,
|
|
Address) const;
|
|
|
|
// Add a long branch stub.
|
|
bool
|
|
add_long_branch_entry(const Powerpc_relobj<size, big_endian>*,
|
|
unsigned int, Address, Address);
|
|
|
|
Address
|
|
find_long_branch_entry(const Powerpc_relobj<size, big_endian>*,
|
|
Address) const;
|
|
|
|
bool
|
|
can_reach_stub(Address from, unsigned int off, unsigned int r_type)
|
|
{
|
|
unsigned long max_branch_offset = max_branch_delta(r_type);
|
|
if (max_branch_offset == 0)
|
|
return true;
|
|
gold_assert(from != invalid_address);
|
|
Address loc = off + this->stub_address();
|
|
return loc - from + max_branch_offset < 2 * max_branch_offset;
|
|
}
|
|
|
|
void
|
|
clear_stubs(bool all)
|
|
{
|
|
this->plt_call_stubs_.clear();
|
|
this->plt_size_ = 0;
|
|
this->long_branch_stubs_.clear();
|
|
this->branch_size_ = 0;
|
|
if (all)
|
|
{
|
|
this->last_plt_size_ = 0;
|
|
this->last_branch_size_ = 0;
|
|
}
|
|
}
|
|
|
|
Address
|
|
set_address_and_size(const Output_section* os, Address off)
|
|
{
|
|
Address start_off = off;
|
|
off += this->orig_data_size_;
|
|
Address my_size = this->plt_size_ + this->branch_size_;
|
|
if (my_size != 0)
|
|
off = align_address(off, this->stub_align());
|
|
// Include original section size and alignment padding in size
|
|
my_size += off - start_off;
|
|
this->reset_address_and_file_offset();
|
|
this->set_current_data_size(my_size);
|
|
this->set_address_and_file_offset(os->address() + start_off,
|
|
os->offset() + start_off);
|
|
return my_size;
|
|
}
|
|
|
|
Address
|
|
stub_address() const
|
|
{
|
|
return align_address(this->address() + this->orig_data_size_,
|
|
this->stub_align());
|
|
}
|
|
|
|
Address
|
|
stub_offset() const
|
|
{
|
|
return align_address(this->offset() + this->orig_data_size_,
|
|
this->stub_align());
|
|
}
|
|
|
|
section_size_type
|
|
plt_size() const
|
|
{ return this->plt_size_; }
|
|
|
|
bool
|
|
size_update()
|
|
{
|
|
Output_section* os = this->output_section();
|
|
if (os->addralign() < this->stub_align())
|
|
{
|
|
os->set_addralign(this->stub_align());
|
|
// FIXME: get rid of the insane checkpointing.
|
|
// We can't increase alignment of the input section to which
|
|
// stubs are attached; The input section may be .init which
|
|
// is pasted together with other .init sections to form a
|
|
// function. Aligning might insert zero padding resulting in
|
|
// sigill. However we do need to increase alignment of the
|
|
// output section so that the align_address() on offset in
|
|
// set_address_and_size() adds the same padding as the
|
|
// align_address() on address in stub_address().
|
|
// What's more, we need this alignment for the layout done in
|
|
// relaxation_loop_body() so that the output section starts at
|
|
// a suitably aligned address.
|
|
os->checkpoint_set_addralign(this->stub_align());
|
|
}
|
|
if (this->last_plt_size_ != this->plt_size_
|
|
|| this->last_branch_size_ != this->branch_size_)
|
|
{
|
|
this->last_plt_size_ = this->plt_size_;
|
|
this->last_branch_size_ = this->branch_size_;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Add .eh_frame info for this stub section. Unlike other linker
|
|
// generated .eh_frame this is added late in the link, because we
|
|
// only want the .eh_frame info if this particular stub section is
|
|
// non-empty.
|
|
void
|
|
add_eh_frame(Layout* layout)
|
|
{
|
|
if (!this->eh_frame_added_)
|
|
{
|
|
if (!parameters->options().ld_generated_unwind_info())
|
|
return;
|
|
|
|
// Since we add stub .eh_frame info late, it must be placed
|
|
// after all other linker generated .eh_frame info so that
|
|
// merge mapping need not be updated for input sections.
|
|
// There is no provision to use a different CIE to that used
|
|
// by .glink.
|
|
if (!this->targ_->has_glink())
|
|
return;
|
|
|
|
layout->add_eh_frame_for_plt(this,
|
|
Eh_cie<size>::eh_frame_cie,
|
|
sizeof (Eh_cie<size>::eh_frame_cie),
|
|
default_fde,
|
|
sizeof (default_fde));
|
|
this->eh_frame_added_ = true;
|
|
}
|
|
}
|
|
|
|
Target_powerpc<size, big_endian>*
|
|
targ() const
|
|
{ return targ_; }
|
|
|
|
private:
|
|
class Plt_stub_ent;
|
|
class Plt_stub_ent_hash;
|
|
typedef Unordered_map<Plt_stub_ent, unsigned int,
|
|
Plt_stub_ent_hash> Plt_stub_entries;
|
|
|
|
// Alignment of stub section.
|
|
unsigned int
|
|
stub_align() const
|
|
{
|
|
if (size == 32)
|
|
return 16;
|
|
unsigned int min_align = 32;
|
|
unsigned int user_align = 1 << parameters->options().plt_align();
|
|
return std::max(user_align, min_align);
|
|
}
|
|
|
|
// Return the plt offset for the given call stub.
|
|
Address
|
|
plt_off(typename Plt_stub_entries::const_iterator p, bool* is_iplt) const
|
|
{
|
|
const Symbol* gsym = p->first.sym_;
|
|
if (gsym != NULL)
|
|
{
|
|
*is_iplt = (gsym->type() == elfcpp::STT_GNU_IFUNC
|
|
&& gsym->can_use_relative_reloc(false));
|
|
return gsym->plt_offset();
|
|
}
|
|
else
|
|
{
|
|
*is_iplt = true;
|
|
const Sized_relobj_file<size, big_endian>* relobj = p->first.object_;
|
|
unsigned int local_sym_index = p->first.locsym_;
|
|
return relobj->local_plt_offset(local_sym_index);
|
|
}
|
|
}
|
|
|
|
// Size of a given plt call stub.
|
|
unsigned int
|
|
plt_call_size(typename Plt_stub_entries::const_iterator p) const
|
|
{
|
|
if (size == 32)
|
|
return 16;
|
|
|
|
bool is_iplt;
|
|
Address plt_addr = this->plt_off(p, &is_iplt);
|
|
if (is_iplt)
|
|
plt_addr += this->targ_->iplt_section()->address();
|
|
else
|
|
plt_addr += this->targ_->plt_section()->address();
|
|
Address got_addr = this->targ_->got_section()->output_section()->address();
|
|
const Powerpc_relobj<size, big_endian>* ppcobj = static_cast
|
|
<const Powerpc_relobj<size, big_endian>*>(p->first.object_);
|
|
got_addr += ppcobj->toc_base_offset();
|
|
Address off = plt_addr - got_addr;
|
|
unsigned int bytes = 4 * 4 + 4 * (ha(off) != 0);
|
|
if (this->targ_->abiversion() < 2)
|
|
{
|
|
bool static_chain = parameters->options().plt_static_chain();
|
|
bool thread_safe = this->targ_->plt_thread_safe();
|
|
bytes += (4
|
|
+ 4 * static_chain
|
|
+ 8 * thread_safe
|
|
+ 4 * (ha(off + 8 + 8 * static_chain) != ha(off)));
|
|
}
|
|
unsigned int align = 1 << parameters->options().plt_align();
|
|
if (align > 1)
|
|
bytes = (bytes + align - 1) & -align;
|
|
return bytes;
|
|
}
|
|
|
|
// Return long branch stub size.
|
|
unsigned int
|
|
branch_stub_size(Address to)
|
|
{
|
|
Address loc
|
|
= this->stub_address() + this->last_plt_size_ + this->branch_size_;
|
|
if (to - loc + (1 << 25) < 2 << 25)
|
|
return 4;
|
|
if (size == 64 || !parameters->options().output_is_position_independent())
|
|
return 16;
|
|
return 32;
|
|
}
|
|
|
|
// Write out stubs.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Plt call stub keys.
|
|
class Plt_stub_ent
|
|
{
|
|
public:
|
|
Plt_stub_ent(const Symbol* sym)
|
|
: sym_(sym), object_(0), addend_(0), locsym_(0)
|
|
{ }
|
|
|
|
Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index)
|
|
: sym_(NULL), object_(object), addend_(0), locsym_(locsym_index)
|
|
{ }
|
|
|
|
Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object,
|
|
const Symbol* sym,
|
|
unsigned int r_type,
|
|
Address addend)
|
|
: sym_(sym), object_(0), addend_(0), locsym_(0)
|
|
{
|
|
if (size != 32)
|
|
this->addend_ = addend;
|
|
else if (parameters->options().output_is_position_independent()
|
|
&& r_type == elfcpp::R_PPC_PLTREL24)
|
|
{
|
|
this->addend_ = addend;
|
|
if (this->addend_ >= 32768)
|
|
this->object_ = object;
|
|
}
|
|
}
|
|
|
|
Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index,
|
|
unsigned int r_type,
|
|
Address addend)
|
|
: sym_(NULL), object_(object), addend_(0), locsym_(locsym_index)
|
|
{
|
|
if (size != 32)
|
|
this->addend_ = addend;
|
|
else if (parameters->options().output_is_position_independent()
|
|
&& r_type == elfcpp::R_PPC_PLTREL24)
|
|
this->addend_ = addend;
|
|
}
|
|
|
|
bool operator==(const Plt_stub_ent& that) const
|
|
{
|
|
return (this->sym_ == that.sym_
|
|
&& this->object_ == that.object_
|
|
&& this->addend_ == that.addend_
|
|
&& this->locsym_ == that.locsym_);
|
|
}
|
|
|
|
const Symbol* sym_;
|
|
const Sized_relobj_file<size, big_endian>* object_;
|
|
typename elfcpp::Elf_types<size>::Elf_Addr addend_;
|
|
unsigned int locsym_;
|
|
};
|
|
|
|
class Plt_stub_ent_hash
|
|
{
|
|
public:
|
|
size_t operator()(const Plt_stub_ent& ent) const
|
|
{
|
|
return (reinterpret_cast<uintptr_t>(ent.sym_)
|
|
^ reinterpret_cast<uintptr_t>(ent.object_)
|
|
^ ent.addend_
|
|
^ ent.locsym_);
|
|
}
|
|
};
|
|
|
|
// Long branch stub keys.
|
|
class Branch_stub_ent
|
|
{
|
|
public:
|
|
Branch_stub_ent(const Powerpc_relobj<size, big_endian>* obj, Address to)
|
|
: dest_(to), toc_base_off_(0)
|
|
{
|
|
if (size == 64)
|
|
toc_base_off_ = obj->toc_base_offset();
|
|
}
|
|
|
|
bool operator==(const Branch_stub_ent& that) const
|
|
{
|
|
return (this->dest_ == that.dest_
|
|
&& (size == 32
|
|
|| this->toc_base_off_ == that.toc_base_off_));
|
|
}
|
|
|
|
Address dest_;
|
|
unsigned int toc_base_off_;
|
|
};
|
|
|
|
class Branch_stub_ent_hash
|
|
{
|
|
public:
|
|
size_t operator()(const Branch_stub_ent& ent) const
|
|
{ return ent.dest_ ^ ent.toc_base_off_; }
|
|
};
|
|
|
|
// In a sane world this would be a global.
|
|
Target_powerpc<size, big_endian>* targ_;
|
|
// Map sym/object/addend to stub offset.
|
|
Plt_stub_entries plt_call_stubs_;
|
|
// Map destination address to stub offset.
|
|
typedef Unordered_map<Branch_stub_ent, unsigned int,
|
|
Branch_stub_ent_hash> Branch_stub_entries;
|
|
Branch_stub_entries long_branch_stubs_;
|
|
// size of input section
|
|
section_size_type orig_data_size_;
|
|
// size of stubs
|
|
section_size_type plt_size_, last_plt_size_, branch_size_, last_branch_size_;
|
|
// Whether .eh_frame info has been created for this stub section.
|
|
bool eh_frame_added_;
|
|
};
|
|
|
|
// Add a plt call stub, if we do not already have one for this
|
|
// sym/object/addend combo.
|
|
|
|
template<int size, bool big_endian>
|
|
bool
|
|
Stub_table<size, big_endian>::add_plt_call_entry(
|
|
Address from,
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
const Symbol* gsym,
|
|
unsigned int r_type,
|
|
Address addend)
|
|
{
|
|
Plt_stub_ent ent(object, gsym, r_type, addend);
|
|
unsigned int off = this->plt_size_;
|
|
std::pair<typename Plt_stub_entries::iterator, bool> p
|
|
= this->plt_call_stubs_.insert(std::make_pair(ent, off));
|
|
if (p.second)
|
|
this->plt_size_ = off + this->plt_call_size(p.first);
|
|
return this->can_reach_stub(from, off, r_type);
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
bool
|
|
Stub_table<size, big_endian>::add_plt_call_entry(
|
|
Address from,
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index,
|
|
unsigned int r_type,
|
|
Address addend)
|
|
{
|
|
Plt_stub_ent ent(object, locsym_index, r_type, addend);
|
|
unsigned int off = this->plt_size_;
|
|
std::pair<typename Plt_stub_entries::iterator, bool> p
|
|
= this->plt_call_stubs_.insert(std::make_pair(ent, off));
|
|
if (p.second)
|
|
this->plt_size_ = off + this->plt_call_size(p.first);
|
|
return this->can_reach_stub(from, off, r_type);
|
|
}
|
|
|
|
// Find a plt call stub.
|
|
|
|
template<int size, bool big_endian>
|
|
typename Stub_table<size, big_endian>::Address
|
|
Stub_table<size, big_endian>::find_plt_call_entry(
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
const Symbol* gsym,
|
|
unsigned int r_type,
|
|
Address addend) const
|
|
{
|
|
Plt_stub_ent ent(object, gsym, r_type, addend);
|
|
typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent);
|
|
return p == this->plt_call_stubs_.end() ? invalid_address : p->second;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
typename Stub_table<size, big_endian>::Address
|
|
Stub_table<size, big_endian>::find_plt_call_entry(const Symbol* gsym) const
|
|
{
|
|
Plt_stub_ent ent(gsym);
|
|
typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent);
|
|
return p == this->plt_call_stubs_.end() ? invalid_address : p->second;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
typename Stub_table<size, big_endian>::Address
|
|
Stub_table<size, big_endian>::find_plt_call_entry(
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index,
|
|
unsigned int r_type,
|
|
Address addend) const
|
|
{
|
|
Plt_stub_ent ent(object, locsym_index, r_type, addend);
|
|
typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent);
|
|
return p == this->plt_call_stubs_.end() ? invalid_address : p->second;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
typename Stub_table<size, big_endian>::Address
|
|
Stub_table<size, big_endian>::find_plt_call_entry(
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index) const
|
|
{
|
|
Plt_stub_ent ent(object, locsym_index);
|
|
typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent);
|
|
return p == this->plt_call_stubs_.end() ? invalid_address : p->second;
|
|
}
|
|
|
|
// Add a long branch stub if we don't already have one to given
|
|
// destination.
|
|
|
|
template<int size, bool big_endian>
|
|
bool
|
|
Stub_table<size, big_endian>::add_long_branch_entry(
|
|
const Powerpc_relobj<size, big_endian>* object,
|
|
unsigned int r_type,
|
|
Address from,
|
|
Address to)
|
|
{
|
|
Branch_stub_ent ent(object, to);
|
|
Address off = this->branch_size_;
|
|
if (this->long_branch_stubs_.insert(std::make_pair(ent, off)).second)
|
|
{
|
|
unsigned int stub_size = this->branch_stub_size(to);
|
|
this->branch_size_ = off + stub_size;
|
|
if (size == 64 && stub_size != 4)
|
|
this->targ_->add_branch_lookup_table(to);
|
|
}
|
|
return this->can_reach_stub(from, off, r_type);
|
|
}
|
|
|
|
// Find long branch stub.
|
|
|
|
template<int size, bool big_endian>
|
|
typename Stub_table<size, big_endian>::Address
|
|
Stub_table<size, big_endian>::find_long_branch_entry(
|
|
const Powerpc_relobj<size, big_endian>* object,
|
|
Address to) const
|
|
{
|
|
Branch_stub_ent ent(object, to);
|
|
typename Branch_stub_entries::const_iterator p
|
|
= this->long_branch_stubs_.find(ent);
|
|
return p == this->long_branch_stubs_.end() ? invalid_address : p->second;
|
|
}
|
|
|
|
// A class to handle .glink.
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_glink : public Output_section_data
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
static const Address invalid_address = static_cast<Address>(0) - 1;
|
|
static const int pltresolve_size = 16*4;
|
|
|
|
Output_data_glink(Target_powerpc<size, big_endian>* targ)
|
|
: Output_section_data(16), targ_(targ), global_entry_stubs_(),
|
|
end_branch_table_(), ge_size_(0)
|
|
{ }
|
|
|
|
void
|
|
add_eh_frame(Layout* layout);
|
|
|
|
void
|
|
add_global_entry(const Symbol*);
|
|
|
|
Address
|
|
find_global_entry(const Symbol*) const;
|
|
|
|
Address
|
|
global_entry_address() const
|
|
{
|
|
gold_assert(this->is_data_size_valid());
|
|
unsigned int global_entry_off = (this->end_branch_table_ + 15) & -16;
|
|
return this->address() + global_entry_off;
|
|
}
|
|
|
|
protected:
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** glink")); }
|
|
|
|
private:
|
|
void
|
|
set_final_data_size();
|
|
|
|
// Write out .glink
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Allows access to .got and .plt for do_write.
|
|
Target_powerpc<size, big_endian>* targ_;
|
|
|
|
// Map sym to stub offset.
|
|
typedef Unordered_map<const Symbol*, unsigned int> Global_entry_stub_entries;
|
|
Global_entry_stub_entries global_entry_stubs_;
|
|
|
|
unsigned int end_branch_table_, ge_size_;
|
|
};
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_glink<size, big_endian>::add_eh_frame(Layout* layout)
|
|
{
|
|
if (!parameters->options().ld_generated_unwind_info())
|
|
return;
|
|
|
|
if (size == 64)
|
|
{
|
|
if (this->targ_->abiversion() < 2)
|
|
layout->add_eh_frame_for_plt(this,
|
|
Eh_cie<64>::eh_frame_cie,
|
|
sizeof (Eh_cie<64>::eh_frame_cie),
|
|
glink_eh_frame_fde_64v1,
|
|
sizeof (glink_eh_frame_fde_64v1));
|
|
else
|
|
layout->add_eh_frame_for_plt(this,
|
|
Eh_cie<64>::eh_frame_cie,
|
|
sizeof (Eh_cie<64>::eh_frame_cie),
|
|
glink_eh_frame_fde_64v2,
|
|
sizeof (glink_eh_frame_fde_64v2));
|
|
}
|
|
else
|
|
{
|
|
// 32-bit .glink can use the default since the CIE return
|
|
// address reg, LR, is valid.
|
|
layout->add_eh_frame_for_plt(this,
|
|
Eh_cie<32>::eh_frame_cie,
|
|
sizeof (Eh_cie<32>::eh_frame_cie),
|
|
default_fde,
|
|
sizeof (default_fde));
|
|
// Except where LR is used in a PIC __glink_PLTresolve.
|
|
if (parameters->options().output_is_position_independent())
|
|
layout->add_eh_frame_for_plt(this,
|
|
Eh_cie<32>::eh_frame_cie,
|
|
sizeof (Eh_cie<32>::eh_frame_cie),
|
|
glink_eh_frame_fde_32,
|
|
sizeof (glink_eh_frame_fde_32));
|
|
}
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_glink<size, big_endian>::add_global_entry(const Symbol* gsym)
|
|
{
|
|
std::pair<typename Global_entry_stub_entries::iterator, bool> p
|
|
= this->global_entry_stubs_.insert(std::make_pair(gsym, this->ge_size_));
|
|
if (p.second)
|
|
this->ge_size_ += 16;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
typename Output_data_glink<size, big_endian>::Address
|
|
Output_data_glink<size, big_endian>::find_global_entry(const Symbol* gsym) const
|
|
{
|
|
typename Global_entry_stub_entries::const_iterator p
|
|
= this->global_entry_stubs_.find(gsym);
|
|
return p == this->global_entry_stubs_.end() ? invalid_address : p->second;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_glink<size, big_endian>::set_final_data_size()
|
|
{
|
|
unsigned int count = this->targ_->plt_entry_count();
|
|
section_size_type total = 0;
|
|
|
|
if (count != 0)
|
|
{
|
|
if (size == 32)
|
|
{
|
|
// space for branch table
|
|
total += 4 * (count - 1);
|
|
|
|
total += -total & 15;
|
|
total += this->pltresolve_size;
|
|
}
|
|
else
|
|
{
|
|
total += this->pltresolve_size;
|
|
|
|
// space for branch table
|
|
total += 4 * count;
|
|
if (this->targ_->abiversion() < 2)
|
|
{
|
|
total += 4 * count;
|
|
if (count > 0x8000)
|
|
total += 4 * (count - 0x8000);
|
|
}
|
|
}
|
|
}
|
|
this->end_branch_table_ = total;
|
|
total = (total + 15) & -16;
|
|
total += this->ge_size_;
|
|
|
|
this->set_data_size(total);
|
|
}
|
|
|
|
// Write out plt and long branch stub code.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Stub_table<size, big_endian>::do_write(Output_file* of)
|
|
{
|
|
if (this->plt_call_stubs_.empty()
|
|
&& this->long_branch_stubs_.empty())
|
|
return;
|
|
|
|
const section_size_type start_off = this->offset();
|
|
const section_size_type off = this->stub_offset();
|
|
const section_size_type oview_size =
|
|
convert_to_section_size_type(this->data_size() - (off - start_off));
|
|
unsigned char* const oview = of->get_output_view(off, oview_size);
|
|
unsigned char* p;
|
|
|
|
if (size == 64)
|
|
{
|
|
const Output_data_got_powerpc<size, big_endian>* got
|
|
= this->targ_->got_section();
|
|
Address got_os_addr = got->output_section()->address();
|
|
|
|
if (!this->plt_call_stubs_.empty())
|
|
{
|
|
// The base address of the .plt section.
|
|
Address plt_base = this->targ_->plt_section()->address();
|
|
Address iplt_base = invalid_address;
|
|
|
|
// Write out plt call stubs.
|
|
typename Plt_stub_entries::const_iterator cs;
|
|
for (cs = this->plt_call_stubs_.begin();
|
|
cs != this->plt_call_stubs_.end();
|
|
++cs)
|
|
{
|
|
bool is_iplt;
|
|
Address pltoff = this->plt_off(cs, &is_iplt);
|
|
Address plt_addr = pltoff;
|
|
if (is_iplt)
|
|
{
|
|
if (iplt_base == invalid_address)
|
|
iplt_base = this->targ_->iplt_section()->address();
|
|
plt_addr += iplt_base;
|
|
}
|
|
else
|
|
plt_addr += plt_base;
|
|
const Powerpc_relobj<size, big_endian>* ppcobj = static_cast
|
|
<const Powerpc_relobj<size, big_endian>*>(cs->first.object_);
|
|
Address got_addr = got_os_addr + ppcobj->toc_base_offset();
|
|
Address off = plt_addr - got_addr;
|
|
|
|
if (off + 0x80008000 > 0xffffffff || (off & 7) != 0)
|
|
gold_error(_("%s: linkage table error against `%s'"),
|
|
cs->first.object_->name().c_str(),
|
|
cs->first.sym_->demangled_name().c_str());
|
|
|
|
bool plt_load_toc = this->targ_->abiversion() < 2;
|
|
bool static_chain
|
|
= plt_load_toc && parameters->options().plt_static_chain();
|
|
bool thread_safe
|
|
= plt_load_toc && this->targ_->plt_thread_safe();
|
|
bool use_fake_dep = false;
|
|
Address cmp_branch_off = 0;
|
|
if (thread_safe)
|
|
{
|
|
unsigned int pltindex
|
|
= ((pltoff - this->targ_->first_plt_entry_offset())
|
|
/ this->targ_->plt_entry_size());
|
|
Address glinkoff
|
|
= (this->targ_->glink_section()->pltresolve_size
|
|
+ pltindex * 8);
|
|
if (pltindex > 32768)
|
|
glinkoff += (pltindex - 32768) * 4;
|
|
Address to
|
|
= this->targ_->glink_section()->address() + glinkoff;
|
|
Address from
|
|
= (this->stub_address() + cs->second + 24
|
|
+ 4 * (ha(off) != 0)
|
|
+ 4 * (ha(off + 8 + 8 * static_chain) != ha(off))
|
|
+ 4 * static_chain);
|
|
cmp_branch_off = to - from;
|
|
use_fake_dep = cmp_branch_off + (1 << 25) >= (1 << 26);
|
|
}
|
|
|
|
p = oview + cs->second;
|
|
if (ha(off) != 0)
|
|
{
|
|
write_insn<big_endian>(p, std_2_1 + this->targ_->stk_toc());
|
|
p += 4;
|
|
if (plt_load_toc)
|
|
{
|
|
write_insn<big_endian>(p, addis_11_2 + ha(off));
|
|
p += 4;
|
|
write_insn<big_endian>(p, ld_12_11 + l(off));
|
|
p += 4;
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p, addis_12_2 + ha(off));
|
|
p += 4;
|
|
write_insn<big_endian>(p, ld_12_12 + l(off));
|
|
p += 4;
|
|
}
|
|
if (plt_load_toc
|
|
&& ha(off + 8 + 8 * static_chain) != ha(off))
|
|
{
|
|
write_insn<big_endian>(p, addi_11_11 + l(off));
|
|
p += 4;
|
|
off = 0;
|
|
}
|
|
write_insn<big_endian>(p, mtctr_12);
|
|
p += 4;
|
|
if (plt_load_toc)
|
|
{
|
|
if (use_fake_dep)
|
|
{
|
|
write_insn<big_endian>(p, xor_2_12_12);
|
|
p += 4;
|
|
write_insn<big_endian>(p, add_11_11_2);
|
|
p += 4;
|
|
}
|
|
write_insn<big_endian>(p, ld_2_11 + l(off + 8));
|
|
p += 4;
|
|
if (static_chain)
|
|
{
|
|
write_insn<big_endian>(p, ld_11_11 + l(off + 16));
|
|
p += 4;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p, std_2_1 + this->targ_->stk_toc());
|
|
p += 4;
|
|
write_insn<big_endian>(p, ld_12_2 + l(off));
|
|
p += 4;
|
|
if (plt_load_toc
|
|
&& ha(off + 8 + 8 * static_chain) != ha(off))
|
|
{
|
|
write_insn<big_endian>(p, addi_2_2 + l(off));
|
|
p += 4;
|
|
off = 0;
|
|
}
|
|
write_insn<big_endian>(p, mtctr_12);
|
|
p += 4;
|
|
if (plt_load_toc)
|
|
{
|
|
if (use_fake_dep)
|
|
{
|
|
write_insn<big_endian>(p, xor_11_12_12);
|
|
p += 4;
|
|
write_insn<big_endian>(p, add_2_2_11);
|
|
p += 4;
|
|
}
|
|
if (static_chain)
|
|
{
|
|
write_insn<big_endian>(p, ld_11_2 + l(off + 16));
|
|
p += 4;
|
|
}
|
|
write_insn<big_endian>(p, ld_2_2 + l(off + 8));
|
|
p += 4;
|
|
}
|
|
}
|
|
if (thread_safe && !use_fake_dep)
|
|
{
|
|
write_insn<big_endian>(p, cmpldi_2_0);
|
|
p += 4;
|
|
write_insn<big_endian>(p, bnectr_p4);
|
|
p += 4;
|
|
write_insn<big_endian>(p, b | (cmp_branch_off & 0x3fffffc));
|
|
}
|
|
else
|
|
write_insn<big_endian>(p, bctr);
|
|
}
|
|
}
|
|
|
|
// Write out long branch stubs.
|
|
typename Branch_stub_entries::const_iterator bs;
|
|
for (bs = this->long_branch_stubs_.begin();
|
|
bs != this->long_branch_stubs_.end();
|
|
++bs)
|
|
{
|
|
p = oview + this->plt_size_ + bs->second;
|
|
Address loc = this->stub_address() + this->plt_size_ + bs->second;
|
|
Address delta = bs->first.dest_ - loc;
|
|
if (delta + (1 << 25) < 2 << 25)
|
|
write_insn<big_endian>(p, b | (delta & 0x3fffffc));
|
|
else
|
|
{
|
|
Address brlt_addr
|
|
= this->targ_->find_branch_lookup_table(bs->first.dest_);
|
|
gold_assert(brlt_addr != invalid_address);
|
|
brlt_addr += this->targ_->brlt_section()->address();
|
|
Address got_addr = got_os_addr + bs->first.toc_base_off_;
|
|
Address brltoff = brlt_addr - got_addr;
|
|
if (ha(brltoff) == 0)
|
|
{
|
|
write_insn<big_endian>(p, ld_12_2 + l(brltoff)), p += 4;
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p, addis_12_2 + ha(brltoff)), p += 4;
|
|
write_insn<big_endian>(p, ld_12_12 + l(brltoff)), p += 4;
|
|
}
|
|
write_insn<big_endian>(p, mtctr_12), p += 4;
|
|
write_insn<big_endian>(p, bctr);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (!this->plt_call_stubs_.empty())
|
|
{
|
|
// The base address of the .plt section.
|
|
Address plt_base = this->targ_->plt_section()->address();
|
|
Address iplt_base = invalid_address;
|
|
// The address of _GLOBAL_OFFSET_TABLE_.
|
|
Address g_o_t = invalid_address;
|
|
|
|
// Write out plt call stubs.
|
|
typename Plt_stub_entries::const_iterator cs;
|
|
for (cs = this->plt_call_stubs_.begin();
|
|
cs != this->plt_call_stubs_.end();
|
|
++cs)
|
|
{
|
|
bool is_iplt;
|
|
Address plt_addr = this->plt_off(cs, &is_iplt);
|
|
if (is_iplt)
|
|
{
|
|
if (iplt_base == invalid_address)
|
|
iplt_base = this->targ_->iplt_section()->address();
|
|
plt_addr += iplt_base;
|
|
}
|
|
else
|
|
plt_addr += plt_base;
|
|
|
|
p = oview + cs->second;
|
|
if (parameters->options().output_is_position_independent())
|
|
{
|
|
Address got_addr;
|
|
const Powerpc_relobj<size, big_endian>* ppcobj
|
|
= (static_cast<const Powerpc_relobj<size, big_endian>*>
|
|
(cs->first.object_));
|
|
if (ppcobj != NULL && cs->first.addend_ >= 32768)
|
|
{
|
|
unsigned int got2 = ppcobj->got2_shndx();
|
|
got_addr = ppcobj->get_output_section_offset(got2);
|
|
gold_assert(got_addr != invalid_address);
|
|
got_addr += (ppcobj->output_section(got2)->address()
|
|
+ cs->first.addend_);
|
|
}
|
|
else
|
|
{
|
|
if (g_o_t == invalid_address)
|
|
{
|
|
const Output_data_got_powerpc<size, big_endian>* got
|
|
= this->targ_->got_section();
|
|
g_o_t = got->address() + got->g_o_t();
|
|
}
|
|
got_addr = g_o_t;
|
|
}
|
|
|
|
Address off = plt_addr - got_addr;
|
|
if (ha(off) == 0)
|
|
{
|
|
write_insn<big_endian>(p + 0, lwz_11_30 + l(off));
|
|
write_insn<big_endian>(p + 4, mtctr_11);
|
|
write_insn<big_endian>(p + 8, bctr);
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p + 0, addis_11_30 + ha(off));
|
|
write_insn<big_endian>(p + 4, lwz_11_11 + l(off));
|
|
write_insn<big_endian>(p + 8, mtctr_11);
|
|
write_insn<big_endian>(p + 12, bctr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p + 0, lis_11 + ha(plt_addr));
|
|
write_insn<big_endian>(p + 4, lwz_11_11 + l(plt_addr));
|
|
write_insn<big_endian>(p + 8, mtctr_11);
|
|
write_insn<big_endian>(p + 12, bctr);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Write out long branch stubs.
|
|
typename Branch_stub_entries::const_iterator bs;
|
|
for (bs = this->long_branch_stubs_.begin();
|
|
bs != this->long_branch_stubs_.end();
|
|
++bs)
|
|
{
|
|
p = oview + this->plt_size_ + bs->second;
|
|
Address loc = this->stub_address() + this->plt_size_ + bs->second;
|
|
Address delta = bs->first.dest_ - loc;
|
|
if (delta + (1 << 25) < 2 << 25)
|
|
write_insn<big_endian>(p, b | (delta & 0x3fffffc));
|
|
else if (!parameters->options().output_is_position_independent())
|
|
{
|
|
write_insn<big_endian>(p + 0, lis_12 + ha(bs->first.dest_));
|
|
write_insn<big_endian>(p + 4, addi_12_12 + l(bs->first.dest_));
|
|
write_insn<big_endian>(p + 8, mtctr_12);
|
|
write_insn<big_endian>(p + 12, bctr);
|
|
}
|
|
else
|
|
{
|
|
delta -= 8;
|
|
write_insn<big_endian>(p + 0, mflr_0);
|
|
write_insn<big_endian>(p + 4, bcl_20_31);
|
|
write_insn<big_endian>(p + 8, mflr_12);
|
|
write_insn<big_endian>(p + 12, addis_12_12 + ha(delta));
|
|
write_insn<big_endian>(p + 16, addi_12_12 + l(delta));
|
|
write_insn<big_endian>(p + 20, mtlr_0);
|
|
write_insn<big_endian>(p + 24, mtctr_12);
|
|
write_insn<big_endian>(p + 28, bctr);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Write out .glink.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_glink<size, big_endian>::do_write(Output_file* of)
|
|
{
|
|
const section_size_type off = this->offset();
|
|
const section_size_type oview_size =
|
|
convert_to_section_size_type(this->data_size());
|
|
unsigned char* const oview = of->get_output_view(off, oview_size);
|
|
unsigned char* p;
|
|
|
|
// The base address of the .plt section.
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
Address plt_base = this->targ_->plt_section()->address();
|
|
|
|
if (size == 64)
|
|
{
|
|
if (this->end_branch_table_ != 0)
|
|
{
|
|
// Write pltresolve stub.
|
|
p = oview;
|
|
Address after_bcl = this->address() + 16;
|
|
Address pltoff = plt_base - after_bcl;
|
|
|
|
elfcpp::Swap<64, big_endian>::writeval(p, pltoff), p += 8;
|
|
|
|
if (this->targ_->abiversion() < 2)
|
|
{
|
|
write_insn<big_endian>(p, mflr_12), p += 4;
|
|
write_insn<big_endian>(p, bcl_20_31), p += 4;
|
|
write_insn<big_endian>(p, mflr_11), p += 4;
|
|
write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4;
|
|
write_insn<big_endian>(p, mtlr_12), p += 4;
|
|
write_insn<big_endian>(p, add_11_2_11), p += 4;
|
|
write_insn<big_endian>(p, ld_12_11 + 0), p += 4;
|
|
write_insn<big_endian>(p, ld_2_11 + 8), p += 4;
|
|
write_insn<big_endian>(p, mtctr_12), p += 4;
|
|
write_insn<big_endian>(p, ld_11_11 + 16), p += 4;
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p, mflr_0), p += 4;
|
|
write_insn<big_endian>(p, bcl_20_31), p += 4;
|
|
write_insn<big_endian>(p, mflr_11), p += 4;
|
|
write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4;
|
|
write_insn<big_endian>(p, mtlr_0), p += 4;
|
|
write_insn<big_endian>(p, sub_12_12_11), p += 4;
|
|
write_insn<big_endian>(p, add_11_2_11), p += 4;
|
|
write_insn<big_endian>(p, addi_0_12 + l(-48)), p += 4;
|
|
write_insn<big_endian>(p, ld_12_11 + 0), p += 4;
|
|
write_insn<big_endian>(p, srdi_0_0_2), p += 4;
|
|
write_insn<big_endian>(p, mtctr_12), p += 4;
|
|
write_insn<big_endian>(p, ld_11_11 + 8), p += 4;
|
|
}
|
|
write_insn<big_endian>(p, bctr), p += 4;
|
|
while (p < oview + this->pltresolve_size)
|
|
write_insn<big_endian>(p, nop), p += 4;
|
|
|
|
// Write lazy link call stubs.
|
|
uint32_t indx = 0;
|
|
while (p < oview + this->end_branch_table_)
|
|
{
|
|
if (this->targ_->abiversion() < 2)
|
|
{
|
|
if (indx < 0x8000)
|
|
{
|
|
write_insn<big_endian>(p, li_0_0 + indx), p += 4;
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p, lis_0_0 + hi(indx)), p += 4;
|
|
write_insn<big_endian>(p, ori_0_0_0 + l(indx)), p += 4;
|
|
}
|
|
}
|
|
uint32_t branch_off = 8 - (p - oview);
|
|
write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4;
|
|
indx++;
|
|
}
|
|
}
|
|
|
|
Address plt_base = this->targ_->plt_section()->address();
|
|
Address iplt_base = invalid_address;
|
|
unsigned int global_entry_off = (this->end_branch_table_ + 15) & -16;
|
|
Address global_entry_base = this->address() + global_entry_off;
|
|
typename Global_entry_stub_entries::const_iterator ge;
|
|
for (ge = this->global_entry_stubs_.begin();
|
|
ge != this->global_entry_stubs_.end();
|
|
++ge)
|
|
{
|
|
p = oview + global_entry_off + ge->second;
|
|
Address plt_addr = ge->first->plt_offset();
|
|
if (ge->first->type() == elfcpp::STT_GNU_IFUNC
|
|
&& ge->first->can_use_relative_reloc(false))
|
|
{
|
|
if (iplt_base == invalid_address)
|
|
iplt_base = this->targ_->iplt_section()->address();
|
|
plt_addr += iplt_base;
|
|
}
|
|
else
|
|
plt_addr += plt_base;
|
|
Address my_addr = global_entry_base + ge->second;
|
|
Address off = plt_addr - my_addr;
|
|
|
|
if (off + 0x80008000 > 0xffffffff || (off & 3) != 0)
|
|
gold_error(_("%s: linkage table error against `%s'"),
|
|
ge->first->object()->name().c_str(),
|
|
ge->first->demangled_name().c_str());
|
|
|
|
write_insn<big_endian>(p, addis_12_12 + ha(off)), p += 4;
|
|
write_insn<big_endian>(p, ld_12_12 + l(off)), p += 4;
|
|
write_insn<big_endian>(p, mtctr_12), p += 4;
|
|
write_insn<big_endian>(p, bctr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
const Output_data_got_powerpc<size, big_endian>* got
|
|
= this->targ_->got_section();
|
|
// The address of _GLOBAL_OFFSET_TABLE_.
|
|
Address g_o_t = got->address() + got->g_o_t();
|
|
|
|
// Write out pltresolve branch table.
|
|
p = oview;
|
|
unsigned int the_end = oview_size - this->pltresolve_size;
|
|
unsigned char* end_p = oview + the_end;
|
|
while (p < end_p - 8 * 4)
|
|
write_insn<big_endian>(p, b + end_p - p), p += 4;
|
|
while (p < end_p)
|
|
write_insn<big_endian>(p, nop), p += 4;
|
|
|
|
// Write out pltresolve call stub.
|
|
if (parameters->options().output_is_position_independent())
|
|
{
|
|
Address res0_off = 0;
|
|
Address after_bcl_off = the_end + 12;
|
|
Address bcl_res0 = after_bcl_off - res0_off;
|
|
|
|
write_insn<big_endian>(p + 0, addis_11_11 + ha(bcl_res0));
|
|
write_insn<big_endian>(p + 4, mflr_0);
|
|
write_insn<big_endian>(p + 8, bcl_20_31);
|
|
write_insn<big_endian>(p + 12, addi_11_11 + l(bcl_res0));
|
|
write_insn<big_endian>(p + 16, mflr_12);
|
|
write_insn<big_endian>(p + 20, mtlr_0);
|
|
write_insn<big_endian>(p + 24, sub_11_11_12);
|
|
|
|
Address got_bcl = g_o_t + 4 - (after_bcl_off + this->address());
|
|
|
|
write_insn<big_endian>(p + 28, addis_12_12 + ha(got_bcl));
|
|
if (ha(got_bcl) == ha(got_bcl + 4))
|
|
{
|
|
write_insn<big_endian>(p + 32, lwz_0_12 + l(got_bcl));
|
|
write_insn<big_endian>(p + 36, lwz_12_12 + l(got_bcl + 4));
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p + 32, lwzu_0_12 + l(got_bcl));
|
|
write_insn<big_endian>(p + 36, lwz_12_12 + 4);
|
|
}
|
|
write_insn<big_endian>(p + 40, mtctr_0);
|
|
write_insn<big_endian>(p + 44, add_0_11_11);
|
|
write_insn<big_endian>(p + 48, add_11_0_11);
|
|
write_insn<big_endian>(p + 52, bctr);
|
|
write_insn<big_endian>(p + 56, nop);
|
|
write_insn<big_endian>(p + 60, nop);
|
|
}
|
|
else
|
|
{
|
|
Address res0 = this->address();
|
|
|
|
write_insn<big_endian>(p + 0, lis_12 + ha(g_o_t + 4));
|
|
write_insn<big_endian>(p + 4, addis_11_11 + ha(-res0));
|
|
if (ha(g_o_t + 4) == ha(g_o_t + 8))
|
|
write_insn<big_endian>(p + 8, lwz_0_12 + l(g_o_t + 4));
|
|
else
|
|
write_insn<big_endian>(p + 8, lwzu_0_12 + l(g_o_t + 4));
|
|
write_insn<big_endian>(p + 12, addi_11_11 + l(-res0));
|
|
write_insn<big_endian>(p + 16, mtctr_0);
|
|
write_insn<big_endian>(p + 20, add_0_11_11);
|
|
if (ha(g_o_t + 4) == ha(g_o_t + 8))
|
|
write_insn<big_endian>(p + 24, lwz_12_12 + l(g_o_t + 8));
|
|
else
|
|
write_insn<big_endian>(p + 24, lwz_12_12 + 4);
|
|
write_insn<big_endian>(p + 28, add_11_0_11);
|
|
write_insn<big_endian>(p + 32, bctr);
|
|
write_insn<big_endian>(p + 36, nop);
|
|
write_insn<big_endian>(p + 40, nop);
|
|
write_insn<big_endian>(p + 44, nop);
|
|
write_insn<big_endian>(p + 48, nop);
|
|
write_insn<big_endian>(p + 52, nop);
|
|
write_insn<big_endian>(p + 56, nop);
|
|
write_insn<big_endian>(p + 60, nop);
|
|
}
|
|
p += 64;
|
|
}
|
|
|
|
of->write_output_view(off, oview_size, oview);
|
|
}
|
|
|
|
|
|
// A class to handle linker generated save/restore functions.
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_save_res : public Output_section_data_build
|
|
{
|
|
public:
|
|
Output_data_save_res(Symbol_table* symtab);
|
|
|
|
protected:
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** save/restore")); }
|
|
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
private:
|
|
// The maximum size of save/restore contents.
|
|
static const unsigned int savres_max = 218*4;
|
|
|
|
void
|
|
savres_define(Symbol_table* symtab,
|
|
const char *name,
|
|
unsigned int lo, unsigned int hi,
|
|
unsigned char* write_ent(unsigned char*, int),
|
|
unsigned char* write_tail(unsigned char*, int));
|
|
|
|
unsigned char *contents_;
|
|
};
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savegpr0(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = std_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8;
|
|
write_insn<big_endian>(p, insn);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savegpr0_tail(unsigned char* p, int r)
|
|
{
|
|
p = savegpr0<big_endian>(p, r);
|
|
uint32_t insn = std_0_1 + 16;
|
|
write_insn<big_endian>(p, insn);
|
|
p = p + 4;
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restgpr0(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = ld_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8;
|
|
write_insn<big_endian>(p, insn);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restgpr0_tail(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = ld_0_1 + 16;
|
|
write_insn<big_endian>(p, insn);
|
|
p = p + 4;
|
|
p = restgpr0<big_endian>(p, r);
|
|
write_insn<big_endian>(p, mtlr_0);
|
|
p = p + 4;
|
|
if (r == 29)
|
|
{
|
|
p = restgpr0<big_endian>(p, 30);
|
|
p = restgpr0<big_endian>(p, 31);
|
|
}
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savegpr1(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = std_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8;
|
|
write_insn<big_endian>(p, insn);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savegpr1_tail(unsigned char* p, int r)
|
|
{
|
|
p = savegpr1<big_endian>(p, r);
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restgpr1(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = ld_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8;
|
|
write_insn<big_endian>(p, insn);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restgpr1_tail(unsigned char* p, int r)
|
|
{
|
|
p = restgpr1<big_endian>(p, r);
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savefpr(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = stfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8;
|
|
write_insn<big_endian>(p, insn);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savefpr0_tail(unsigned char* p, int r)
|
|
{
|
|
p = savefpr<big_endian>(p, r);
|
|
write_insn<big_endian>(p, std_0_1 + 16);
|
|
p = p + 4;
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restfpr(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = lfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8;
|
|
write_insn<big_endian>(p, insn);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restfpr0_tail(unsigned char* p, int r)
|
|
{
|
|
write_insn<big_endian>(p, ld_0_1 + 16);
|
|
p = p + 4;
|
|
p = restfpr<big_endian>(p, r);
|
|
write_insn<big_endian>(p, mtlr_0);
|
|
p = p + 4;
|
|
if (r == 29)
|
|
{
|
|
p = restfpr<big_endian>(p, 30);
|
|
p = restfpr<big_endian>(p, 31);
|
|
}
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savefpr1_tail(unsigned char* p, int r)
|
|
{
|
|
p = savefpr<big_endian>(p, r);
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restfpr1_tail(unsigned char* p, int r)
|
|
{
|
|
p = restfpr<big_endian>(p, r);
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savevr(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16;
|
|
write_insn<big_endian>(p, insn);
|
|
p = p + 4;
|
|
insn = stvx_0_12_0 + (r << 21);
|
|
write_insn<big_endian>(p, insn);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
savevr_tail(unsigned char* p, int r)
|
|
{
|
|
p = savevr<big_endian>(p, r);
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restvr(unsigned char* p, int r)
|
|
{
|
|
uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16;
|
|
write_insn<big_endian>(p, insn);
|
|
p = p + 4;
|
|
insn = lvx_0_12_0 + (r << 21);
|
|
write_insn<big_endian>(p, insn);
|
|
return p + 4;
|
|
}
|
|
|
|
template<bool big_endian>
|
|
static unsigned char*
|
|
restvr_tail(unsigned char* p, int r)
|
|
{
|
|
p = restvr<big_endian>(p, r);
|
|
write_insn<big_endian>(p, blr);
|
|
return p + 4;
|
|
}
|
|
|
|
|
|
template<int size, bool big_endian>
|
|
Output_data_save_res<size, big_endian>::Output_data_save_res(
|
|
Symbol_table* symtab)
|
|
: Output_section_data_build(4),
|
|
contents_(NULL)
|
|
{
|
|
this->savres_define(symtab,
|
|
"_savegpr0_", 14, 31,
|
|
savegpr0<big_endian>, savegpr0_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_restgpr0_", 14, 29,
|
|
restgpr0<big_endian>, restgpr0_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_restgpr0_", 30, 31,
|
|
restgpr0<big_endian>, restgpr0_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_savegpr1_", 14, 31,
|
|
savegpr1<big_endian>, savegpr1_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_restgpr1_", 14, 31,
|
|
restgpr1<big_endian>, restgpr1_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_savefpr_", 14, 31,
|
|
savefpr<big_endian>, savefpr0_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_restfpr_", 14, 29,
|
|
restfpr<big_endian>, restfpr0_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_restfpr_", 30, 31,
|
|
restfpr<big_endian>, restfpr0_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"._savef", 14, 31,
|
|
savefpr<big_endian>, savefpr1_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"._restf", 14, 31,
|
|
restfpr<big_endian>, restfpr1_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_savevr_", 20, 31,
|
|
savevr<big_endian>, savevr_tail<big_endian>);
|
|
this->savres_define(symtab,
|
|
"_restvr_", 20, 31,
|
|
restvr<big_endian>, restvr_tail<big_endian>);
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_save_res<size, big_endian>::savres_define(
|
|
Symbol_table* symtab,
|
|
const char *name,
|
|
unsigned int lo, unsigned int hi,
|
|
unsigned char* write_ent(unsigned char*, int),
|
|
unsigned char* write_tail(unsigned char*, int))
|
|
{
|
|
size_t len = strlen(name);
|
|
bool writing = false;
|
|
char sym[16];
|
|
|
|
memcpy(sym, name, len);
|
|
sym[len + 2] = 0;
|
|
|
|
for (unsigned int i = lo; i <= hi; i++)
|
|
{
|
|
sym[len + 0] = i / 10 + '0';
|
|
sym[len + 1] = i % 10 + '0';
|
|
Symbol* gsym = symtab->lookup(sym);
|
|
bool refd = gsym != NULL && gsym->is_undefined();
|
|
writing = writing || refd;
|
|
if (writing)
|
|
{
|
|
if (this->contents_ == NULL)
|
|
this->contents_ = new unsigned char[this->savres_max];
|
|
|
|
section_size_type value = this->current_data_size();
|
|
unsigned char* p = this->contents_ + value;
|
|
if (i != hi)
|
|
p = write_ent(p, i);
|
|
else
|
|
p = write_tail(p, i);
|
|
section_size_type cur_size = p - this->contents_;
|
|
this->set_current_data_size(cur_size);
|
|
if (refd)
|
|
symtab->define_in_output_data(sym, NULL, Symbol_table::PREDEFINED,
|
|
this, value, cur_size - value,
|
|
elfcpp::STT_FUNC, elfcpp::STB_GLOBAL,
|
|
elfcpp::STV_HIDDEN, 0, false, false);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Write out save/restore.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_save_res<size, big_endian>::do_write(Output_file* of)
|
|
{
|
|
const section_size_type off = this->offset();
|
|
const section_size_type oview_size =
|
|
convert_to_section_size_type(this->data_size());
|
|
unsigned char* const oview = of->get_output_view(off, oview_size);
|
|
memcpy(oview, this->contents_, oview_size);
|
|
of->write_output_view(off, oview_size, oview);
|
|
}
|
|
|
|
|
|
// Create the glink section.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::make_glink_section(Layout* layout)
|
|
{
|
|
if (this->glink_ == NULL)
|
|
{
|
|
this->glink_ = new Output_data_glink<size, big_endian>(this);
|
|
this->glink_->add_eh_frame(layout);
|
|
layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS,
|
|
elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
|
|
this->glink_, ORDER_TEXT, false);
|
|
}
|
|
}
|
|
|
|
// Create a PLT entry for a global symbol.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab,
|
|
Layout* layout,
|
|
Symbol* gsym)
|
|
{
|
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC
|
|
&& gsym->can_use_relative_reloc(false))
|
|
{
|
|
if (this->iplt_ == NULL)
|
|
this->make_iplt_section(symtab, layout);
|
|
this->iplt_->add_ifunc_entry(gsym);
|
|
}
|
|
else
|
|
{
|
|
if (this->plt_ == NULL)
|
|
this->make_plt_section(symtab, layout);
|
|
this->plt_->add_entry(gsym);
|
|
}
|
|
}
|
|
|
|
// Make a PLT entry for a local STT_GNU_IFUNC symbol.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::make_local_ifunc_plt_entry(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
Sized_relobj_file<size, big_endian>* relobj,
|
|
unsigned int r_sym)
|
|
{
|
|
if (this->iplt_ == NULL)
|
|
this->make_iplt_section(symtab, layout);
|
|
this->iplt_->add_local_ifunc_entry(relobj, r_sym);
|
|
}
|
|
|
|
// Return the number of entries in the PLT.
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Target_powerpc<size, big_endian>::plt_entry_count() const
|
|
{
|
|
if (this->plt_ == NULL)
|
|
return 0;
|
|
return this->plt_->entry_count();
|
|
}
|
|
|
|
// Create a GOT entry for local dynamic __tls_get_addr calls.
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Target_powerpc<size, big_endian>::tlsld_got_offset(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
Sized_relobj_file<size, big_endian>* object)
|
|
{
|
|
if (this->tlsld_got_offset_ == -1U)
|
|
{
|
|
gold_assert(symtab != NULL && layout != NULL && object != NULL);
|
|
Reloc_section* rela_dyn = this->rela_dyn_section(layout);
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= this->got_section(symtab, layout);
|
|
unsigned int got_offset = got->add_constant_pair(0, 0);
|
|
rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got,
|
|
got_offset, 0);
|
|
this->tlsld_got_offset_ = got_offset;
|
|
}
|
|
return this->tlsld_got_offset_;
|
|
}
|
|
|
|
// Get the Reference_flags for a particular relocation.
|
|
|
|
template<int size, bool big_endian>
|
|
int
|
|
Target_powerpc<size, big_endian>::Scan::get_reference_flags(
|
|
unsigned int r_type,
|
|
const Target_powerpc* target)
|
|
{
|
|
int ref = 0;
|
|
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_NONE:
|
|
case elfcpp::R_POWERPC_GNU_VTINHERIT:
|
|
case elfcpp::R_POWERPC_GNU_VTENTRY:
|
|
case elfcpp::R_PPC64_TOC:
|
|
// No symbol reference.
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR64:
|
|
case elfcpp::R_PPC64_UADDR64:
|
|
case elfcpp::R_POWERPC_ADDR32:
|
|
case elfcpp::R_POWERPC_UADDR32:
|
|
case elfcpp::R_POWERPC_ADDR16:
|
|
case elfcpp::R_POWERPC_UADDR16:
|
|
case elfcpp::R_POWERPC_ADDR16_LO:
|
|
case elfcpp::R_POWERPC_ADDR16_HI:
|
|
case elfcpp::R_POWERPC_ADDR16_HA:
|
|
ref = Symbol::ABSOLUTE_REF;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_ADDR24:
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
ref = Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF;
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_REL64:
|
|
case elfcpp::R_POWERPC_REL32:
|
|
case elfcpp::R_PPC_LOCAL24PC:
|
|
case elfcpp::R_POWERPC_REL16:
|
|
case elfcpp::R_POWERPC_REL16_LO:
|
|
case elfcpp::R_POWERPC_REL16_HI:
|
|
case elfcpp::R_POWERPC_REL16_HA:
|
|
ref = Symbol::RELATIVE_REF;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_REL24:
|
|
case elfcpp::R_PPC_PLTREL24:
|
|
case elfcpp::R_POWERPC_REL14:
|
|
case elfcpp::R_POWERPC_REL14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
|
|
ref = Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT16:
|
|
case elfcpp::R_POWERPC_GOT16_LO:
|
|
case elfcpp::R_POWERPC_GOT16_HI:
|
|
case elfcpp::R_POWERPC_GOT16_HA:
|
|
case elfcpp::R_PPC64_GOT16_DS:
|
|
case elfcpp::R_PPC64_GOT16_LO_DS:
|
|
case elfcpp::R_PPC64_TOC16:
|
|
case elfcpp::R_PPC64_TOC16_LO:
|
|
case elfcpp::R_PPC64_TOC16_HI:
|
|
case elfcpp::R_PPC64_TOC16_HA:
|
|
case elfcpp::R_PPC64_TOC16_DS:
|
|
case elfcpp::R_PPC64_TOC16_LO_DS:
|
|
// Absolute in GOT.
|
|
ref = Symbol::ABSOLUTE_REF;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TPREL16:
|
|
case elfcpp::R_POWERPC_TLS:
|
|
ref = Symbol::TLS_REF;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_COPY:
|
|
case elfcpp::R_POWERPC_GLOB_DAT:
|
|
case elfcpp::R_POWERPC_JMP_SLOT:
|
|
case elfcpp::R_POWERPC_RELATIVE:
|
|
case elfcpp::R_POWERPC_DTPMOD:
|
|
default:
|
|
// Not expected. We will give an error later.
|
|
break;
|
|
}
|
|
|
|
if (size == 64 && target->abiversion() < 2)
|
|
ref |= Symbol::FUNC_DESC_ABI;
|
|
return ref;
|
|
}
|
|
|
|
// Report an unsupported relocation against a local symbol.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local(
|
|
Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int r_type)
|
|
{
|
|
gold_error(_("%s: unsupported reloc %u against local symbol"),
|
|
object->name().c_str(), r_type);
|
|
}
|
|
|
|
// We are about to emit a dynamic relocation of type R_TYPE. If the
|
|
// dynamic linker does not support it, issue an error.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object,
|
|
unsigned int r_type)
|
|
{
|
|
gold_assert(r_type != elfcpp::R_POWERPC_NONE);
|
|
|
|
// These are the relocation types supported by glibc for both 32-bit
|
|
// and 64-bit powerpc.
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_NONE:
|
|
case elfcpp::R_POWERPC_RELATIVE:
|
|
case elfcpp::R_POWERPC_GLOB_DAT:
|
|
case elfcpp::R_POWERPC_DTPMOD:
|
|
case elfcpp::R_POWERPC_DTPREL:
|
|
case elfcpp::R_POWERPC_TPREL:
|
|
case elfcpp::R_POWERPC_JMP_SLOT:
|
|
case elfcpp::R_POWERPC_COPY:
|
|
case elfcpp::R_POWERPC_IRELATIVE:
|
|
case elfcpp::R_POWERPC_ADDR32:
|
|
case elfcpp::R_POWERPC_UADDR32:
|
|
case elfcpp::R_POWERPC_ADDR24:
|
|
case elfcpp::R_POWERPC_ADDR16:
|
|
case elfcpp::R_POWERPC_UADDR16:
|
|
case elfcpp::R_POWERPC_ADDR16_LO:
|
|
case elfcpp::R_POWERPC_ADDR16_HI:
|
|
case elfcpp::R_POWERPC_ADDR16_HA:
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
case elfcpp::R_POWERPC_REL32:
|
|
case elfcpp::R_POWERPC_REL24:
|
|
case elfcpp::R_POWERPC_TPREL16:
|
|
case elfcpp::R_POWERPC_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_TPREL16_HA:
|
|
return;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (size == 64)
|
|
{
|
|
switch (r_type)
|
|
{
|
|
// These are the relocation types supported only on 64-bit.
|
|
case elfcpp::R_PPC64_ADDR64:
|
|
case elfcpp::R_PPC64_UADDR64:
|
|
case elfcpp::R_PPC64_JMP_IREL:
|
|
case elfcpp::R_PPC64_ADDR16_DS:
|
|
case elfcpp::R_PPC64_ADDR16_LO_DS:
|
|
case elfcpp::R_PPC64_ADDR16_HIGH:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHA:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHER:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHEST:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHERA:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHESTA:
|
|
case elfcpp::R_PPC64_REL64:
|
|
case elfcpp::R_POWERPC_ADDR30:
|
|
case elfcpp::R_PPC64_TPREL16_DS:
|
|
case elfcpp::R_PPC64_TPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_TPREL16_HIGH:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHESTA:
|
|
return;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (r_type)
|
|
{
|
|
// These are the relocation types supported only on 32-bit.
|
|
// ??? glibc ld.so doesn't need to support these.
|
|
case elfcpp::R_POWERPC_DTPREL16:
|
|
case elfcpp::R_POWERPC_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_DTPREL16_HA:
|
|
return;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
// This prevents us from issuing more than one error per reloc
|
|
// section. But we can still wind up issuing more than one
|
|
// error per object file.
|
|
if (this->issued_non_pic_error_)
|
|
return;
|
|
gold_assert(parameters->options().output_is_position_independent());
|
|
object->error(_("requires unsupported dynamic reloc; "
|
|
"recompile with -fPIC"));
|
|
this->issued_non_pic_error_ = true;
|
|
return;
|
|
}
|
|
|
|
// Return whether we need to make a PLT entry for a relocation of the
|
|
// given type against a STT_GNU_IFUNC symbol.
|
|
|
|
template<int size, bool big_endian>
|
|
bool
|
|
Target_powerpc<size, big_endian>::Scan::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)
|
|
{
|
|
// In non-pic code any reference will resolve to the plt call stub
|
|
// for the ifunc symbol.
|
|
if ((size == 32 || target->abiversion() >= 2)
|
|
&& !parameters->options().output_is_position_independent())
|
|
return true;
|
|
|
|
switch (r_type)
|
|
{
|
|
// Word size refs from data sections are OK, but don't need a PLT entry.
|
|
case elfcpp::R_POWERPC_ADDR32:
|
|
case elfcpp::R_POWERPC_UADDR32:
|
|
if (size == 32)
|
|
return false;
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR64:
|
|
case elfcpp::R_PPC64_UADDR64:
|
|
if (size == 64)
|
|
return false;
|
|
break;
|
|
|
|
// GOT refs are good, but also don't need a PLT entry.
|
|
case elfcpp::R_POWERPC_GOT16:
|
|
case elfcpp::R_POWERPC_GOT16_LO:
|
|
case elfcpp::R_POWERPC_GOT16_HI:
|
|
case elfcpp::R_POWERPC_GOT16_HA:
|
|
case elfcpp::R_PPC64_GOT16_DS:
|
|
case elfcpp::R_PPC64_GOT16_LO_DS:
|
|
return false;
|
|
|
|
// Function calls are good, and these do need a PLT entry.
|
|
case elfcpp::R_POWERPC_ADDR24:
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
case elfcpp::R_POWERPC_REL24:
|
|
case elfcpp::R_PPC_PLTREL24:
|
|
case elfcpp::R_POWERPC_REL14:
|
|
case elfcpp::R_POWERPC_REL14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
|
|
return true;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// Anything else is a problem.
|
|
// If we are building a static executable, the libc startup function
|
|
// responsible for applying indirect function relocations is going
|
|
// to complain about the reloc type.
|
|
// If we are building a dynamic executable, we will have a text
|
|
// relocation. The dynamic loader will set the text segment
|
|
// writable and non-executable to apply text relocations. So we'll
|
|
// segfault when trying to run the indirection function to resolve
|
|
// the reloc.
|
|
if (report_err)
|
|
gold_error(_("%s: unsupported reloc %u for IFUNC symbol"),
|
|
object->name().c_str(), r_type);
|
|
return false;
|
|
}
|
|
|
|
// Scan a relocation for a local symbol.
|
|
|
|
template<int size, bool big_endian>
|
|
inline void
|
|
Target_powerpc<size, big_endian>::Scan::local(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
Target_powerpc<size, big_endian>* 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)
|
|
{
|
|
this->maybe_skip_tls_get_addr_call(r_type, NULL);
|
|
|
|
if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD)
|
|
|| (size == 32 && r_type == elfcpp::R_PPC_TLSGD))
|
|
{
|
|
this->expect_tls_get_addr_call();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_gd(true);
|
|
if (tls_type != tls::TLSOPT_NONE)
|
|
this->skip_next_tls_get_addr_call();
|
|
}
|
|
else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD)
|
|
|| (size == 32 && r_type == elfcpp::R_PPC_TLSLD))
|
|
{
|
|
this->expect_tls_get_addr_call();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ld();
|
|
if (tls_type != tls::TLSOPT_NONE)
|
|
this->skip_next_tls_get_addr_call();
|
|
}
|
|
|
|
Powerpc_relobj<size, big_endian>* ppc_object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(object);
|
|
|
|
if (is_discarded)
|
|
{
|
|
if (size == 64
|
|
&& data_shndx == ppc_object->opd_shndx()
|
|
&& r_type == elfcpp::R_PPC64_ADDR64)
|
|
ppc_object->set_opd_discard(reloc.get_r_offset());
|
|
return;
|
|
}
|
|
|
|
// A local STT_GNU_IFUNC symbol may require a PLT entry.
|
|
bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
|
|
if (is_ifunc && this->reloc_needs_plt_for_ifunc(target, object, r_type, true))
|
|
{
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
|
|
target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
|
|
r_type, r_sym, reloc.get_r_addend());
|
|
target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
|
|
}
|
|
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_NONE:
|
|
case elfcpp::R_POWERPC_GNU_VTINHERIT:
|
|
case elfcpp::R_POWERPC_GNU_VTENTRY:
|
|
case elfcpp::R_PPC64_TOCSAVE:
|
|
case elfcpp::R_POWERPC_TLS:
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_TOC:
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
if (parameters->options().output_is_position_independent())
|
|
{
|
|
Address off = reloc.get_r_offset();
|
|
if (size == 64
|
|
&& target->abiversion() < 2
|
|
&& data_shndx == ppc_object->opd_shndx()
|
|
&& ppc_object->get_opd_discard(off - 8))
|
|
break;
|
|
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
Powerpc_relobj<size, big_endian>* symobj = ppc_object;
|
|
rela_dyn->add_output_section_relative(got->output_section(),
|
|
elfcpp::R_POWERPC_RELATIVE,
|
|
output_section,
|
|
object, data_shndx, off,
|
|
symobj->toc_base_offset());
|
|
}
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR64:
|
|
case elfcpp::R_PPC64_UADDR64:
|
|
case elfcpp::R_POWERPC_ADDR32:
|
|
case elfcpp::R_POWERPC_UADDR32:
|
|
case elfcpp::R_POWERPC_ADDR24:
|
|
case elfcpp::R_POWERPC_ADDR16:
|
|
case elfcpp::R_POWERPC_ADDR16_LO:
|
|
case elfcpp::R_POWERPC_ADDR16_HI:
|
|
case elfcpp::R_POWERPC_ADDR16_HA:
|
|
case elfcpp::R_POWERPC_UADDR16:
|
|
case elfcpp::R_PPC64_ADDR16_HIGH:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHA:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHER:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHERA:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHEST:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHESTA:
|
|
case elfcpp::R_PPC64_ADDR16_DS:
|
|
case elfcpp::R_PPC64_ADDR16_LO_DS:
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
// If building a shared library (or a position-independent
|
|
// executable), we need to create a dynamic relocation for
|
|
// this location.
|
|
if (parameters->options().output_is_position_independent()
|
|
|| (size == 64 && is_ifunc && target->abiversion() < 2))
|
|
{
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(symtab, layout,
|
|
is_ifunc);
|
|
if ((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32)
|
|
|| (size == 64 && r_type == elfcpp::R_PPC64_ADDR64))
|
|
{
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
|
|
unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE
|
|
: elfcpp::R_POWERPC_RELATIVE);
|
|
rela_dyn->add_local_relative(object, r_sym, dynrel,
|
|
output_section, data_shndx,
|
|
reloc.get_r_offset(),
|
|
reloc.get_r_addend(), false);
|
|
}
|
|
else
|
|
{
|
|
check_non_pic(object, r_type);
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
|
|
rela_dyn->add_local(object, r_sym, r_type, output_section,
|
|
data_shndx, reloc.get_r_offset(),
|
|
reloc.get_r_addend());
|
|
}
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_REL24:
|
|
case elfcpp::R_PPC_PLTREL24:
|
|
case elfcpp::R_PPC_LOCAL24PC:
|
|
case elfcpp::R_POWERPC_REL14:
|
|
case elfcpp::R_POWERPC_REL14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
|
|
if (!is_ifunc)
|
|
target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
|
|
r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()),
|
|
reloc.get_r_addend());
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_REL64:
|
|
case elfcpp::R_POWERPC_REL32:
|
|
case elfcpp::R_POWERPC_REL16:
|
|
case elfcpp::R_POWERPC_REL16_LO:
|
|
case elfcpp::R_POWERPC_REL16_HI:
|
|
case elfcpp::R_POWERPC_REL16_HA:
|
|
case elfcpp::R_POWERPC_SECTOFF:
|
|
case elfcpp::R_POWERPC_SECTOFF_LO:
|
|
case elfcpp::R_POWERPC_SECTOFF_HI:
|
|
case elfcpp::R_POWERPC_SECTOFF_HA:
|
|
case elfcpp::R_PPC64_SECTOFF_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_LO_DS:
|
|
case elfcpp::R_POWERPC_TPREL16:
|
|
case elfcpp::R_POWERPC_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_TPREL16_HA:
|
|
case elfcpp::R_PPC64_TPREL16_DS:
|
|
case elfcpp::R_PPC64_TPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_TPREL16_HIGH:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHESTA:
|
|
case elfcpp::R_POWERPC_DTPREL16:
|
|
case elfcpp::R_POWERPC_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_DTPREL16_HA:
|
|
case elfcpp::R_PPC64_DTPREL16_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGH:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
|
|
case elfcpp::R_PPC64_TLSGD:
|
|
case elfcpp::R_PPC64_TLSLD:
|
|
case elfcpp::R_PPC64_ADDR64_LOCAL:
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT16:
|
|
case elfcpp::R_POWERPC_GOT16_LO:
|
|
case elfcpp::R_POWERPC_GOT16_HI:
|
|
case elfcpp::R_POWERPC_GOT16_HA:
|
|
case elfcpp::R_PPC64_GOT16_DS:
|
|
case elfcpp::R_PPC64_GOT16_LO_DS:
|
|
{
|
|
// The symbol requires a GOT entry.
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
|
|
|
|
if (!parameters->options().output_is_position_independent())
|
|
{
|
|
if ((size == 32 && is_ifunc)
|
|
|| (size == 64 && target->abiversion() >= 2))
|
|
got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
|
|
else
|
|
got->add_local(object, r_sym, GOT_TYPE_STANDARD);
|
|
}
|
|
else if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
|
|
{
|
|
// If we are generating a shared object or a pie, this
|
|
// symbol's GOT entry will be set by a dynamic relocation.
|
|
unsigned int off;
|
|
off = got->add_constant(0);
|
|
object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
|
|
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(symtab, layout,
|
|
is_ifunc);
|
|
unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE
|
|
: elfcpp::R_POWERPC_RELATIVE);
|
|
rela_dyn->add_local_relative(object, r_sym, dynrel,
|
|
got, off, 0, false);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_TOC16:
|
|
case elfcpp::R_PPC64_TOC16_LO:
|
|
case elfcpp::R_PPC64_TOC16_HI:
|
|
case elfcpp::R_PPC64_TOC16_HA:
|
|
case elfcpp::R_PPC64_TOC16_DS:
|
|
case elfcpp::R_PPC64_TOC16_LO_DS:
|
|
// We need a GOT section.
|
|
target->got_section(symtab, layout);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
|
|
{
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_gd(true);
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
got->add_local_tls_pair(object, r_sym, GOT_TYPE_TLSGD,
|
|
rela_dyn, elfcpp::R_POWERPC_DTPMOD);
|
|
}
|
|
else if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
// no GOT relocs needed for Local Exec.
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
|
|
{
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ld();
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
target->tlsld_got_offset(symtab, layout, object);
|
|
else if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
// no GOT relocs needed for Local Exec.
|
|
if (parameters->options().emit_relocs())
|
|
{
|
|
Output_section* os = layout->tls_segment()->first_section();
|
|
gold_assert(os != NULL);
|
|
os->set_needs_symtab_index();
|
|
}
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
|
|
got->add_local_tls(object, r_sym, GOT_TYPE_DTPREL);
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TPREL16:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HA:
|
|
{
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ie(true);
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
{
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
|
|
if (!object->local_has_got_offset(r_sym, GOT_TYPE_TPREL))
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
unsigned int off = got->add_constant(0);
|
|
object->set_local_got_offset(r_sym, GOT_TYPE_TPREL, off);
|
|
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
rela_dyn->add_symbolless_local_addend(object, r_sym,
|
|
elfcpp::R_POWERPC_TPREL,
|
|
got, off, 0);
|
|
}
|
|
}
|
|
else if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
// no GOT relocs needed for Local Exec.
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
}
|
|
break;
|
|
|
|
default:
|
|
unsupported_reloc_local(object, r_type);
|
|
break;
|
|
}
|
|
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16:
|
|
case elfcpp::R_POWERPC_GOT16:
|
|
case elfcpp::R_PPC64_GOT16_DS:
|
|
case elfcpp::R_PPC64_TOC16:
|
|
case elfcpp::R_PPC64_TOC16_DS:
|
|
ppc_object->set_has_small_toc_reloc();
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Report an unsupported relocation against a global symbol.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global(
|
|
Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int r_type,
|
|
Symbol* gsym)
|
|
{
|
|
gold_error(_("%s: unsupported reloc %u against global symbol %s"),
|
|
object->name().c_str(), r_type, gsym->demangled_name().c_str());
|
|
}
|
|
|
|
// Scan a relocation for a global symbol.
|
|
|
|
template<int size, bool big_endian>
|
|
inline void
|
|
Target_powerpc<size, big_endian>::Scan::global(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
Target_powerpc<size, big_endian>* 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)
|
|
{
|
|
if (this->maybe_skip_tls_get_addr_call(r_type, gsym) == Track_tls::SKIP)
|
|
return;
|
|
|
|
if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD)
|
|
|| (size == 32 && r_type == elfcpp::R_PPC_TLSGD))
|
|
{
|
|
this->expect_tls_get_addr_call();
|
|
const bool final = gsym->final_value_is_known();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_gd(final);
|
|
if (tls_type != tls::TLSOPT_NONE)
|
|
this->skip_next_tls_get_addr_call();
|
|
}
|
|
else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD)
|
|
|| (size == 32 && r_type == elfcpp::R_PPC_TLSLD))
|
|
{
|
|
this->expect_tls_get_addr_call();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ld();
|
|
if (tls_type != tls::TLSOPT_NONE)
|
|
this->skip_next_tls_get_addr_call();
|
|
}
|
|
|
|
Powerpc_relobj<size, big_endian>* ppc_object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(object);
|
|
|
|
// A STT_GNU_IFUNC symbol may require a PLT entry.
|
|
bool is_ifunc = gsym->type() == elfcpp::STT_GNU_IFUNC;
|
|
bool pushed_ifunc = false;
|
|
if (is_ifunc && this->reloc_needs_plt_for_ifunc(target, object, r_type, true))
|
|
{
|
|
target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
|
|
r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()),
|
|
reloc.get_r_addend());
|
|
target->make_plt_entry(symtab, layout, gsym);
|
|
pushed_ifunc = true;
|
|
}
|
|
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_NONE:
|
|
case elfcpp::R_POWERPC_GNU_VTINHERIT:
|
|
case elfcpp::R_POWERPC_GNU_VTENTRY:
|
|
case elfcpp::R_PPC_LOCAL24PC:
|
|
case elfcpp::R_POWERPC_TLS:
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_TOC:
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
if (parameters->options().output_is_position_independent())
|
|
{
|
|
Address off = reloc.get_r_offset();
|
|
if (size == 64
|
|
&& data_shndx == ppc_object->opd_shndx()
|
|
&& ppc_object->get_opd_discard(off - 8))
|
|
break;
|
|
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
Powerpc_relobj<size, big_endian>* symobj = ppc_object;
|
|
if (data_shndx != ppc_object->opd_shndx())
|
|
symobj = static_cast
|
|
<Powerpc_relobj<size, big_endian>*>(gsym->object());
|
|
rela_dyn->add_output_section_relative(got->output_section(),
|
|
elfcpp::R_POWERPC_RELATIVE,
|
|
output_section,
|
|
object, data_shndx, off,
|
|
symobj->toc_base_offset());
|
|
}
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR64:
|
|
if (size == 64
|
|
&& target->abiversion() < 2
|
|
&& data_shndx == ppc_object->opd_shndx()
|
|
&& (gsym->is_defined_in_discarded_section()
|
|
|| gsym->object() != object))
|
|
{
|
|
ppc_object->set_opd_discard(reloc.get_r_offset());
|
|
break;
|
|
}
|
|
// Fall thru
|
|
case elfcpp::R_PPC64_UADDR64:
|
|
case elfcpp::R_POWERPC_ADDR32:
|
|
case elfcpp::R_POWERPC_UADDR32:
|
|
case elfcpp::R_POWERPC_ADDR24:
|
|
case elfcpp::R_POWERPC_ADDR16:
|
|
case elfcpp::R_POWERPC_ADDR16_LO:
|
|
case elfcpp::R_POWERPC_ADDR16_HI:
|
|
case elfcpp::R_POWERPC_ADDR16_HA:
|
|
case elfcpp::R_POWERPC_UADDR16:
|
|
case elfcpp::R_PPC64_ADDR16_HIGH:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHA:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHER:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHERA:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHEST:
|
|
case elfcpp::R_PPC64_ADDR16_HIGHESTA:
|
|
case elfcpp::R_PPC64_ADDR16_DS:
|
|
case elfcpp::R_PPC64_ADDR16_LO_DS:
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
{
|
|
// Make a PLT entry if necessary.
|
|
if (gsym->needs_plt_entry())
|
|
{
|
|
// Since this is not a PC-relative relocation, we may be
|
|
// taking the address of a function. In that case we need to
|
|
// set the entry in the dynamic symbol table to the address of
|
|
// the PLT call stub.
|
|
bool need_ifunc_plt = false;
|
|
if ((size == 32 || target->abiversion() >= 2)
|
|
&& gsym->is_from_dynobj()
|
|
&& !parameters->options().output_is_position_independent())
|
|
{
|
|
gsym->set_needs_dynsym_value();
|
|
need_ifunc_plt = true;
|
|
}
|
|
if (!is_ifunc || (!pushed_ifunc && need_ifunc_plt))
|
|
{
|
|
target->push_branch(ppc_object, data_shndx,
|
|
reloc.get_r_offset(), r_type,
|
|
elfcpp::elf_r_sym<size>(reloc.get_r_info()),
|
|
reloc.get_r_addend());
|
|
target->make_plt_entry(symtab, layout, gsym);
|
|
}
|
|
}
|
|
// Make a dynamic relocation if necessary.
|
|
if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type, target))
|
|
|| (size == 64 && is_ifunc && target->abiversion() < 2))
|
|
{
|
|
if (!parameters->options().output_is_position_independent()
|
|
&& gsym->may_need_copy_reloc())
|
|
{
|
|
target->copy_reloc(symtab, layout, object,
|
|
data_shndx, output_section, gsym, reloc);
|
|
}
|
|
else if ((((size == 32
|
|
&& r_type == elfcpp::R_POWERPC_ADDR32)
|
|
|| (size == 64
|
|
&& r_type == elfcpp::R_PPC64_ADDR64
|
|
&& target->abiversion() >= 2))
|
|
&& gsym->can_use_relative_reloc(false)
|
|
&& !(gsym->visibility() == elfcpp::STV_PROTECTED
|
|
&& parameters->options().shared()))
|
|
|| (size == 64
|
|
&& r_type == elfcpp::R_PPC64_ADDR64
|
|
&& target->abiversion() < 2
|
|
&& (gsym->can_use_relative_reloc(false)
|
|
|| data_shndx == ppc_object->opd_shndx())))
|
|
{
|
|
Reloc_section* rela_dyn
|
|
= target->rela_dyn_section(symtab, layout, is_ifunc);
|
|
unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE
|
|
: elfcpp::R_POWERPC_RELATIVE);
|
|
rela_dyn->add_symbolless_global_addend(
|
|
gsym, dynrel, output_section, object, data_shndx,
|
|
reloc.get_r_offset(), reloc.get_r_addend());
|
|
}
|
|
else
|
|
{
|
|
Reloc_section* rela_dyn
|
|
= target->rela_dyn_section(symtab, layout, is_ifunc);
|
|
check_non_pic(object, r_type);
|
|
rela_dyn->add_global(gsym, r_type, output_section,
|
|
object, data_shndx,
|
|
reloc.get_r_offset(),
|
|
reloc.get_r_addend());
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_PPC_PLTREL24:
|
|
case elfcpp::R_POWERPC_REL24:
|
|
if (!is_ifunc)
|
|
{
|
|
target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
|
|
r_type,
|
|
elfcpp::elf_r_sym<size>(reloc.get_r_info()),
|
|
reloc.get_r_addend());
|
|
if (gsym->needs_plt_entry()
|
|
|| (!gsym->final_value_is_known()
|
|
&& (gsym->is_undefined()
|
|
|| gsym->is_from_dynobj()
|
|
|| gsym->is_preemptible())))
|
|
target->make_plt_entry(symtab, layout, gsym);
|
|
}
|
|
// Fall thru
|
|
|
|
case elfcpp::R_PPC64_REL64:
|
|
case elfcpp::R_POWERPC_REL32:
|
|
// Make a dynamic relocation if necessary.
|
|
if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type, target)))
|
|
{
|
|
if (!parameters->options().output_is_position_independent()
|
|
&& gsym->may_need_copy_reloc())
|
|
{
|
|
target->copy_reloc(symtab, layout, object,
|
|
data_shndx, output_section, gsym,
|
|
reloc);
|
|
}
|
|
else
|
|
{
|
|
Reloc_section* rela_dyn
|
|
= target->rela_dyn_section(symtab, layout, is_ifunc);
|
|
check_non_pic(object, r_type);
|
|
rela_dyn->add_global(gsym, r_type, output_section, object,
|
|
data_shndx, reloc.get_r_offset(),
|
|
reloc.get_r_addend());
|
|
}
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_REL14:
|
|
case elfcpp::R_POWERPC_REL14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
|
|
if (!is_ifunc)
|
|
target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
|
|
r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()),
|
|
reloc.get_r_addend());
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_REL16:
|
|
case elfcpp::R_POWERPC_REL16_LO:
|
|
case elfcpp::R_POWERPC_REL16_HI:
|
|
case elfcpp::R_POWERPC_REL16_HA:
|
|
case elfcpp::R_POWERPC_SECTOFF:
|
|
case elfcpp::R_POWERPC_SECTOFF_LO:
|
|
case elfcpp::R_POWERPC_SECTOFF_HI:
|
|
case elfcpp::R_POWERPC_SECTOFF_HA:
|
|
case elfcpp::R_PPC64_SECTOFF_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_LO_DS:
|
|
case elfcpp::R_POWERPC_TPREL16:
|
|
case elfcpp::R_POWERPC_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_TPREL16_HA:
|
|
case elfcpp::R_PPC64_TPREL16_DS:
|
|
case elfcpp::R_PPC64_TPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_TPREL16_HIGH:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHESTA:
|
|
case elfcpp::R_POWERPC_DTPREL16:
|
|
case elfcpp::R_POWERPC_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_DTPREL16_HA:
|
|
case elfcpp::R_PPC64_DTPREL16_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGH:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
|
|
case elfcpp::R_PPC64_TLSGD:
|
|
case elfcpp::R_PPC64_TLSLD:
|
|
case elfcpp::R_PPC64_ADDR64_LOCAL:
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT16:
|
|
case elfcpp::R_POWERPC_GOT16_LO:
|
|
case elfcpp::R_POWERPC_GOT16_HI:
|
|
case elfcpp::R_POWERPC_GOT16_HA:
|
|
case elfcpp::R_PPC64_GOT16_DS:
|
|
case elfcpp::R_PPC64_GOT16_LO_DS:
|
|
{
|
|
// The symbol requires a GOT entry.
|
|
Output_data_got_powerpc<size, big_endian>* got;
|
|
|
|
got = target->got_section(symtab, layout);
|
|
if (gsym->final_value_is_known())
|
|
{
|
|
if ((size == 32 && is_ifunc)
|
|
|| (size == 64 && target->abiversion() >= 2))
|
|
got->add_global_plt(gsym, GOT_TYPE_STANDARD);
|
|
else
|
|
got->add_global(gsym, GOT_TYPE_STANDARD);
|
|
}
|
|
else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
|
|
{
|
|
// If we are generating a shared object or a pie, this
|
|
// symbol's GOT entry will be set by a dynamic relocation.
|
|
unsigned int off = got->add_constant(0);
|
|
gsym->set_got_offset(GOT_TYPE_STANDARD, off);
|
|
|
|
Reloc_section* rela_dyn
|
|
= target->rela_dyn_section(symtab, layout, is_ifunc);
|
|
|
|
if (gsym->can_use_relative_reloc(false)
|
|
&& !((size == 32
|
|
|| target->abiversion() >= 2)
|
|
&& gsym->visibility() == elfcpp::STV_PROTECTED
|
|
&& parameters->options().shared()))
|
|
{
|
|
unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE
|
|
: elfcpp::R_POWERPC_RELATIVE);
|
|
rela_dyn->add_global_relative(gsym, dynrel, got, off, 0, false);
|
|
}
|
|
else
|
|
{
|
|
unsigned int dynrel = elfcpp::R_POWERPC_GLOB_DAT;
|
|
rela_dyn->add_global(gsym, dynrel, got, off, 0);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_TOC16:
|
|
case elfcpp::R_PPC64_TOC16_LO:
|
|
case elfcpp::R_PPC64_TOC16_HI:
|
|
case elfcpp::R_PPC64_TOC16_HA:
|
|
case elfcpp::R_PPC64_TOC16_DS:
|
|
case elfcpp::R_PPC64_TOC16_LO_DS:
|
|
// We need a GOT section.
|
|
target->got_section(symtab, layout);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
|
|
{
|
|
const bool final = gsym->final_value_is_known();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_gd(final);
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
got->add_global_pair_with_rel(gsym, GOT_TYPE_TLSGD, rela_dyn,
|
|
elfcpp::R_POWERPC_DTPMOD,
|
|
elfcpp::R_POWERPC_DTPREL);
|
|
}
|
|
else if (tls_type == tls::TLSOPT_TO_IE)
|
|
{
|
|
if (!gsym->has_got_offset(GOT_TYPE_TPREL))
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
if (gsym->is_undefined()
|
|
|| gsym->is_from_dynobj())
|
|
{
|
|
got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn,
|
|
elfcpp::R_POWERPC_TPREL);
|
|
}
|
|
else
|
|
{
|
|
unsigned int off = got->add_constant(0);
|
|
gsym->set_got_offset(GOT_TYPE_TPREL, off);
|
|
unsigned int dynrel = elfcpp::R_POWERPC_TPREL;
|
|
rela_dyn->add_symbolless_global_addend(gsym, dynrel,
|
|
got, off, 0);
|
|
}
|
|
}
|
|
}
|
|
else if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
// no GOT relocs needed for Local Exec.
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
|
|
{
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ld();
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
target->tlsld_got_offset(symtab, layout, object);
|
|
else if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
// no GOT relocs needed for Local Exec.
|
|
if (parameters->options().emit_relocs())
|
|
{
|
|
Output_section* os = layout->tls_segment()->first_section();
|
|
gold_assert(os != NULL);
|
|
os->set_needs_symtab_index();
|
|
}
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
if (!gsym->final_value_is_known()
|
|
&& (gsym->is_from_dynobj()
|
|
|| gsym->is_undefined()
|
|
|| gsym->is_preemptible()))
|
|
got->add_global_with_rel(gsym, GOT_TYPE_DTPREL,
|
|
target->rela_dyn_section(layout),
|
|
elfcpp::R_POWERPC_DTPREL);
|
|
else
|
|
got->add_global_tls(gsym, GOT_TYPE_DTPREL);
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TPREL16:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HA:
|
|
{
|
|
const bool final = gsym->final_value_is_known();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ie(final);
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
{
|
|
if (!gsym->has_got_offset(GOT_TYPE_TPREL))
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
if (gsym->is_undefined()
|
|
|| gsym->is_from_dynobj())
|
|
{
|
|
got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn,
|
|
elfcpp::R_POWERPC_TPREL);
|
|
}
|
|
else
|
|
{
|
|
unsigned int off = got->add_constant(0);
|
|
gsym->set_got_offset(GOT_TYPE_TPREL, off);
|
|
unsigned int dynrel = elfcpp::R_POWERPC_TPREL;
|
|
rela_dyn->add_symbolless_global_addend(gsym, dynrel,
|
|
got, off, 0);
|
|
}
|
|
}
|
|
}
|
|
else if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
// no GOT relocs needed for Local Exec.
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
}
|
|
break;
|
|
|
|
default:
|
|
unsupported_reloc_global(object, r_type, gsym);
|
|
break;
|
|
}
|
|
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16:
|
|
case elfcpp::R_POWERPC_GOT16:
|
|
case elfcpp::R_PPC64_GOT16_DS:
|
|
case elfcpp::R_PPC64_TOC16:
|
|
case elfcpp::R_PPC64_TOC16_DS:
|
|
ppc_object->set_has_small_toc_reloc();
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Process relocations for gc.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::gc_process_relocs(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int data_shndx,
|
|
unsigned int,
|
|
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)
|
|
{
|
|
typedef Target_powerpc<size, big_endian> Powerpc;
|
|
typedef typename Target_powerpc<size, big_endian>::Scan Scan;
|
|
Powerpc_relobj<size, big_endian>* ppc_object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(object);
|
|
if (size == 64)
|
|
ppc_object->set_opd_valid();
|
|
if (size == 64 && data_shndx == ppc_object->opd_shndx())
|
|
{
|
|
typename Powerpc_relobj<size, big_endian>::Access_from::iterator p;
|
|
for (p = ppc_object->access_from_map()->begin();
|
|
p != ppc_object->access_from_map()->end();
|
|
++p)
|
|
{
|
|
Address dst_off = p->first;
|
|
unsigned int dst_indx = ppc_object->get_opd_ent(dst_off);
|
|
typename Powerpc_relobj<size, big_endian>::Section_refs::iterator s;
|
|
for (s = p->second.begin(); s != p->second.end(); ++s)
|
|
{
|
|
Object* src_obj = s->first;
|
|
unsigned int src_indx = s->second;
|
|
symtab->gc()->add_reference(src_obj, src_indx,
|
|
ppc_object, dst_indx);
|
|
}
|
|
p->second.clear();
|
|
}
|
|
ppc_object->access_from_map()->clear();
|
|
ppc_object->process_gc_mark(symtab);
|
|
// Don't look at .opd relocs as .opd will reference everything.
|
|
return;
|
|
}
|
|
|
|
gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan,
|
|
typename Target_powerpc::Relocatable_size_for_reloc>(
|
|
symtab,
|
|
layout,
|
|
this,
|
|
object,
|
|
data_shndx,
|
|
prelocs,
|
|
reloc_count,
|
|
output_section,
|
|
needs_special_offset_handling,
|
|
local_symbol_count,
|
|
plocal_symbols);
|
|
}
|
|
|
|
// 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.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::do_gc_add_reference(
|
|
Symbol_table* symtab,
|
|
Object* src_obj,
|
|
unsigned int src_shndx,
|
|
Object* dst_obj,
|
|
unsigned int dst_shndx,
|
|
Address dst_off) const
|
|
{
|
|
if (size != 64 || dst_obj->is_dynamic())
|
|
return;
|
|
|
|
Powerpc_relobj<size, big_endian>* ppc_object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(dst_obj);
|
|
if (dst_shndx != 0 && dst_shndx == ppc_object->opd_shndx())
|
|
{
|
|
if (ppc_object->opd_valid())
|
|
{
|
|
dst_shndx = ppc_object->get_opd_ent(dst_off);
|
|
symtab->gc()->add_reference(src_obj, src_shndx, dst_obj, dst_shndx);
|
|
}
|
|
else
|
|
{
|
|
// If we haven't run scan_opd_relocs, we must delay
|
|
// processing this function descriptor reference.
|
|
ppc_object->add_reference(src_obj, src_shndx, dst_off);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add any special sections for this symbol to the gc work list.
|
|
// For powerpc64, this adds the code section of a function
|
|
// descriptor.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::do_gc_mark_symbol(
|
|
Symbol_table* symtab,
|
|
Symbol* sym) const
|
|
{
|
|
if (size == 64)
|
|
{
|
|
Powerpc_relobj<size, big_endian>* ppc_object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(sym->object());
|
|
bool is_ordinary;
|
|
unsigned int shndx = sym->shndx(&is_ordinary);
|
|
if (is_ordinary && shndx != 0 && shndx == ppc_object->opd_shndx())
|
|
{
|
|
Sized_symbol<size>* gsym = symtab->get_sized_symbol<size>(sym);
|
|
Address dst_off = gsym->value();
|
|
if (ppc_object->opd_valid())
|
|
{
|
|
unsigned int dst_indx = ppc_object->get_opd_ent(dst_off);
|
|
symtab->gc()->worklist().push(Section_id(ppc_object, dst_indx));
|
|
}
|
|
else
|
|
ppc_object->add_gc_mark(dst_off);
|
|
}
|
|
}
|
|
}
|
|
|
|
// For a symbol location in .opd, set LOC to the location of the
|
|
// function entry.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::do_function_location(
|
|
Symbol_location* loc) const
|
|
{
|
|
if (size == 64 && loc->shndx != 0)
|
|
{
|
|
if (loc->object->is_dynamic())
|
|
{
|
|
Powerpc_dynobj<size, big_endian>* ppc_object
|
|
= static_cast<Powerpc_dynobj<size, big_endian>*>(loc->object);
|
|
if (loc->shndx == ppc_object->opd_shndx())
|
|
{
|
|
Address dest_off;
|
|
Address off = loc->offset - ppc_object->opd_address();
|
|
loc->shndx = ppc_object->get_opd_ent(off, &dest_off);
|
|
loc->offset = dest_off;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
const Powerpc_relobj<size, big_endian>* ppc_object
|
|
= static_cast<const Powerpc_relobj<size, big_endian>*>(loc->object);
|
|
if (loc->shndx == ppc_object->opd_shndx())
|
|
{
|
|
Address dest_off;
|
|
loc->shndx = ppc_object->get_opd_ent(loc->offset, &dest_off);
|
|
loc->offset = dest_off;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Scan relocations for a section.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::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)
|
|
{
|
|
typedef Target_powerpc<size, big_endian> Powerpc;
|
|
typedef typename Target_powerpc<size, big_endian>::Scan Scan;
|
|
|
|
if (sh_type == elfcpp::SHT_REL)
|
|
{
|
|
gold_error(_("%s: unsupported REL reloc section"),
|
|
object->name().c_str());
|
|
return;
|
|
}
|
|
|
|
gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
|
|
symtab,
|
|
layout,
|
|
this,
|
|
object,
|
|
data_shndx,
|
|
prelocs,
|
|
reloc_count,
|
|
output_section,
|
|
needs_special_offset_handling,
|
|
local_symbol_count,
|
|
plocal_symbols);
|
|
}
|
|
|
|
// Functor class for processing the global symbol table.
|
|
// Removes symbols defined on discarded opd entries.
|
|
|
|
template<bool big_endian>
|
|
class Global_symbol_visitor_opd
|
|
{
|
|
public:
|
|
Global_symbol_visitor_opd()
|
|
{ }
|
|
|
|
void
|
|
operator()(Sized_symbol<64>* sym)
|
|
{
|
|
if (sym->has_symtab_index()
|
|
|| sym->source() != Symbol::FROM_OBJECT
|
|
|| !sym->in_real_elf())
|
|
return;
|
|
|
|
if (sym->object()->is_dynamic())
|
|
return;
|
|
|
|
Powerpc_relobj<64, big_endian>* symobj
|
|
= static_cast<Powerpc_relobj<64, big_endian>*>(sym->object());
|
|
if (symobj->opd_shndx() == 0)
|
|
return;
|
|
|
|
bool is_ordinary;
|
|
unsigned int shndx = sym->shndx(&is_ordinary);
|
|
if (shndx == symobj->opd_shndx()
|
|
&& symobj->get_opd_discard(sym->value()))
|
|
sym->set_symtab_index(-1U);
|
|
}
|
|
};
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::define_save_restore_funcs(
|
|
Layout* layout,
|
|
Symbol_table* symtab)
|
|
{
|
|
if (size == 64)
|
|
{
|
|
Output_data_save_res<64, big_endian>* savres
|
|
= new Output_data_save_res<64, big_endian>(symtab);
|
|
layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS,
|
|
elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
|
|
savres, ORDER_TEXT, false);
|
|
}
|
|
}
|
|
|
|
// Sort linker created .got section first (for the header), then input
|
|
// sections belonging to files using small model code.
|
|
|
|
template<bool big_endian>
|
|
class Sort_toc_sections
|
|
{
|
|
public:
|
|
bool
|
|
operator()(const Output_section::Input_section& is1,
|
|
const Output_section::Input_section& is2) const
|
|
{
|
|
if (!is1.is_input_section() && is2.is_input_section())
|
|
return true;
|
|
bool small1
|
|
= (is1.is_input_section()
|
|
&& (static_cast<const Powerpc_relobj<64, big_endian>*>(is1.relobj())
|
|
->has_small_toc_reloc()));
|
|
bool small2
|
|
= (is2.is_input_section()
|
|
&& (static_cast<const Powerpc_relobj<64, big_endian>*>(is2.relobj())
|
|
->has_small_toc_reloc()));
|
|
return small1 && !small2;
|
|
}
|
|
};
|
|
|
|
// Finalize the sections.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::do_finalize_sections(
|
|
Layout* layout,
|
|
const Input_objects*,
|
|
Symbol_table* symtab)
|
|
{
|
|
if (parameters->doing_static_link())
|
|
{
|
|
// At least some versions of glibc elf-init.o have a strong
|
|
// reference to __rela_iplt marker syms. A weak ref would be
|
|
// better..
|
|
if (this->iplt_ != NULL)
|
|
{
|
|
Reloc_section* rel = this->iplt_->rel_plt();
|
|
symtab->define_in_output_data("__rela_iplt_start", NULL,
|
|
Symbol_table::PREDEFINED, rel, 0, 0,
|
|
elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
|
|
elfcpp::STV_HIDDEN, 0, false, true);
|
|
symtab->define_in_output_data("__rela_iplt_end", NULL,
|
|
Symbol_table::PREDEFINED, rel, 0, 0,
|
|
elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
|
|
elfcpp::STV_HIDDEN, 0, true, true);
|
|
}
|
|
else
|
|
{
|
|
symtab->define_as_constant("__rela_iplt_start", NULL,
|
|
Symbol_table::PREDEFINED, 0, 0,
|
|
elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
|
|
elfcpp::STV_HIDDEN, 0, true, false);
|
|
symtab->define_as_constant("__rela_iplt_end", NULL,
|
|
Symbol_table::PREDEFINED, 0, 0,
|
|
elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
|
|
elfcpp::STV_HIDDEN, 0, true, false);
|
|
}
|
|
}
|
|
|
|
if (size == 64)
|
|
{
|
|
typedef Global_symbol_visitor_opd<big_endian> Symbol_visitor;
|
|
symtab->for_all_symbols<64, Symbol_visitor>(Symbol_visitor());
|
|
|
|
if (!parameters->options().relocatable())
|
|
{
|
|
this->define_save_restore_funcs(layout, symtab);
|
|
|
|
// Annoyingly, we need to make these sections now whether or
|
|
// not we need them. If we delay until do_relax then we
|
|
// need to mess with the relaxation machinery checkpointing.
|
|
this->got_section(symtab, layout);
|
|
this->make_brlt_section(layout);
|
|
|
|
if (parameters->options().toc_sort())
|
|
{
|
|
Output_section* os = this->got_->output_section();
|
|
if (os != NULL && os->input_sections().size() > 1)
|
|
std::stable_sort(os->input_sections().begin(),
|
|
os->input_sections().end(),
|
|
Sort_toc_sections<big_endian>());
|
|
}
|
|
}
|
|
}
|
|
|
|
// Fill in some more dynamic tags.
|
|
Output_data_dynamic* odyn = layout->dynamic_data();
|
|
if (odyn != NULL)
|
|
{
|
|
const Reloc_section* rel_plt = (this->plt_ == NULL
|
|
? NULL
|
|
: this->plt_->rel_plt());
|
|
layout->add_target_dynamic_tags(false, this->plt_, rel_plt,
|
|
this->rela_dyn_, true, size == 32);
|
|
|
|
if (size == 32)
|
|
{
|
|
if (this->got_ != NULL)
|
|
{
|
|
this->got_->finalize_data_size();
|
|
odyn->add_section_plus_offset(elfcpp::DT_PPC_GOT,
|
|
this->got_, this->got_->g_o_t());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (this->glink_ != NULL)
|
|
{
|
|
this->glink_->finalize_data_size();
|
|
odyn->add_section_plus_offset(elfcpp::DT_PPC64_GLINK,
|
|
this->glink_,
|
|
(this->glink_->pltresolve_size
|
|
- 32));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Emit any relocs we saved in an attempt to avoid generating COPY
|
|
// relocs.
|
|
if (this->copy_relocs_.any_saved_relocs())
|
|
this->copy_relocs_.emit(this->rela_dyn_section(layout));
|
|
}
|
|
|
|
// Return TRUE iff INSN is one we expect on a _LO variety toc/got
|
|
// reloc.
|
|
|
|
static bool
|
|
ok_lo_toc_insn(uint32_t insn)
|
|
{
|
|
return ((insn & (0x3f << 26)) == 14u << 26 /* addi */
|
|
|| (insn & (0x3f << 26)) == 32u << 26 /* lwz */
|
|
|| (insn & (0x3f << 26)) == 34u << 26 /* lbz */
|
|
|| (insn & (0x3f << 26)) == 36u << 26 /* stw */
|
|
|| (insn & (0x3f << 26)) == 38u << 26 /* stb */
|
|
|| (insn & (0x3f << 26)) == 40u << 26 /* lhz */
|
|
|| (insn & (0x3f << 26)) == 42u << 26 /* lha */
|
|
|| (insn & (0x3f << 26)) == 44u << 26 /* sth */
|
|
|| (insn & (0x3f << 26)) == 46u << 26 /* lmw */
|
|
|| (insn & (0x3f << 26)) == 47u << 26 /* stmw */
|
|
|| (insn & (0x3f << 26)) == 48u << 26 /* lfs */
|
|
|| (insn & (0x3f << 26)) == 50u << 26 /* lfd */
|
|
|| (insn & (0x3f << 26)) == 52u << 26 /* stfs */
|
|
|| (insn & (0x3f << 26)) == 54u << 26 /* stfd */
|
|
|| ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */
|
|
&& (insn & 3) != 1)
|
|
|| ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */
|
|
&& ((insn & 3) == 0 || (insn & 3) == 3))
|
|
|| (insn & (0x3f << 26)) == 12u << 26 /* addic */);
|
|
}
|
|
|
|
// Return the value to use for a branch relocation.
|
|
|
|
template<int size, bool big_endian>
|
|
typename Target_powerpc<size, big_endian>::Address
|
|
Target_powerpc<size, big_endian>::symval_for_branch(
|
|
const Symbol_table* symtab,
|
|
Address value,
|
|
const Sized_symbol<size>* gsym,
|
|
Powerpc_relobj<size, big_endian>* object,
|
|
unsigned int *dest_shndx)
|
|
{
|
|
if (size == 32 || this->abiversion() >= 2)
|
|
gold_unreachable();
|
|
*dest_shndx = 0;
|
|
|
|
// If the symbol is defined in an opd section, ie. is a function
|
|
// descriptor, use the function descriptor code entry address
|
|
Powerpc_relobj<size, big_endian>* symobj = object;
|
|
if (gsym != NULL
|
|
&& gsym->source() != Symbol::FROM_OBJECT)
|
|
return value;
|
|
if (gsym != NULL)
|
|
symobj = static_cast<Powerpc_relobj<size, big_endian>*>(gsym->object());
|
|
unsigned int shndx = symobj->opd_shndx();
|
|
if (shndx == 0)
|
|
return value;
|
|
Address opd_addr = symobj->get_output_section_offset(shndx);
|
|
if (opd_addr == invalid_address)
|
|
return value;
|
|
opd_addr += symobj->output_section_address(shndx);
|
|
if (value >= opd_addr && value < opd_addr + symobj->section_size(shndx))
|
|
{
|
|
Address sec_off;
|
|
*dest_shndx = symobj->get_opd_ent(value - opd_addr, &sec_off);
|
|
if (symtab->is_section_folded(symobj, *dest_shndx))
|
|
{
|
|
Section_id folded
|
|
= symtab->icf()->get_folded_section(symobj, *dest_shndx);
|
|
symobj = static_cast<Powerpc_relobj<size, big_endian>*>(folded.first);
|
|
*dest_shndx = folded.second;
|
|
}
|
|
Address sec_addr = symobj->get_output_section_offset(*dest_shndx);
|
|
gold_assert(sec_addr != invalid_address);
|
|
sec_addr += symobj->output_section(*dest_shndx)->address();
|
|
value = sec_addr + sec_off;
|
|
}
|
|
return value;
|
|
}
|
|
|
|
// Perform a relocation.
|
|
|
|
template<int size, bool big_endian>
|
|
inline bool
|
|
Target_powerpc<size, big_endian>::Relocate::relocate(
|
|
const Relocate_info<size, big_endian>* relinfo,
|
|
Target_powerpc* target,
|
|
Output_section* os,
|
|
size_t relnum,
|
|
const elfcpp::Rela<size, big_endian>& rela,
|
|
unsigned int r_type,
|
|
const Sized_symbol<size>* gsym,
|
|
const Symbol_value<size>* psymval,
|
|
unsigned char* view,
|
|
Address address,
|
|
section_size_type view_size)
|
|
{
|
|
if (view == NULL)
|
|
return true;
|
|
|
|
switch (this->maybe_skip_tls_get_addr_call(r_type, gsym))
|
|
{
|
|
case Track_tls::NOT_EXPECTED:
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("__tls_get_addr call lacks marker reloc"));
|
|
break;
|
|
case Track_tls::EXPECTED:
|
|
// We have already complained.
|
|
break;
|
|
case Track_tls::SKIP:
|
|
return true;
|
|
case Track_tls::NORMAL:
|
|
break;
|
|
}
|
|
|
|
typedef Powerpc_relocate_functions<size, big_endian> Reloc;
|
|
typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn;
|
|
Powerpc_relobj<size, big_endian>* const object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object);
|
|
Address value = 0;
|
|
bool has_stub_value = false;
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
|
|
if ((gsym != NULL
|
|
? gsym->use_plt_offset(Scan::get_reference_flags(r_type, target))
|
|
: object->local_has_plt_offset(r_sym))
|
|
&& (!psymval->is_ifunc_symbol()
|
|
|| Scan::reloc_needs_plt_for_ifunc(target, object, r_type, false)))
|
|
{
|
|
if (size == 64
|
|
&& gsym != NULL
|
|
&& target->abiversion() >= 2
|
|
&& !parameters->options().output_is_position_independent()
|
|
&& !is_branch_reloc(r_type))
|
|
{
|
|
unsigned int off = target->glink_section()->find_global_entry(gsym);
|
|
gold_assert(off != (unsigned int)-1);
|
|
value = target->glink_section()->global_entry_address() + off;
|
|
}
|
|
else
|
|
{
|
|
Stub_table<size, big_endian>* stub_table
|
|
= object->stub_table(relinfo->data_shndx);
|
|
if (stub_table == NULL)
|
|
{
|
|
// This is a ref from a data section to an ifunc symbol.
|
|
if (target->stub_tables().size() != 0)
|
|
stub_table = target->stub_tables()[0];
|
|
}
|
|
gold_assert(stub_table != NULL);
|
|
Address off;
|
|
if (gsym != NULL)
|
|
off = stub_table->find_plt_call_entry(object, gsym, r_type,
|
|
rela.get_r_addend());
|
|
else
|
|
off = stub_table->find_plt_call_entry(object, r_sym, r_type,
|
|
rela.get_r_addend());
|
|
gold_assert(off != invalid_address);
|
|
value = stub_table->stub_address() + off;
|
|
}
|
|
has_stub_value = true;
|
|
}
|
|
|
|
if (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)
|
|
{
|
|
if (gsym != NULL)
|
|
{
|
|
gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
|
|
value = gsym->got_offset(GOT_TYPE_STANDARD);
|
|
}
|
|
else
|
|
{
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
|
|
gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
|
|
value = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
|
|
}
|
|
value -= target->got_section()->got_base_offset(object);
|
|
}
|
|
else if (r_type == elfcpp::R_PPC64_TOC)
|
|
{
|
|
value = (target->got_section()->output_section()->address()
|
|
+ object->toc_base_offset());
|
|
}
|
|
else if (gsym != NULL
|
|
&& (r_type == elfcpp::R_POWERPC_REL24
|
|
|| r_type == elfcpp::R_PPC_PLTREL24)
|
|
&& has_stub_value)
|
|
{
|
|
if (size == 64)
|
|
{
|
|
typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
|
|
Valtype* wv = reinterpret_cast<Valtype*>(view);
|
|
bool can_plt_call = false;
|
|
if (rela.get_r_offset() + 8 <= view_size)
|
|
{
|
|
Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
|
|
Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1);
|
|
if ((insn & 1) != 0
|
|
&& (insn2 == nop
|
|
|| insn2 == cror_15_15_15 || insn2 == cror_31_31_31))
|
|
{
|
|
elfcpp::Swap<32, big_endian>::
|
|
writeval(wv + 1, ld_2_1 + target->stk_toc());
|
|
can_plt_call = true;
|
|
}
|
|
}
|
|
if (!can_plt_call)
|
|
{
|
|
// If we don't have a branch and link followed by a nop,
|
|
// we can't go via the plt because there is no place to
|
|
// put a toc restoring instruction.
|
|
// Unless we know we won't be returning.
|
|
if (strcmp(gsym->name(), "__libc_start_main") == 0)
|
|
can_plt_call = true;
|
|
}
|
|
if (!can_plt_call)
|
|
{
|
|
// g++ as of 20130507 emits self-calls without a
|
|
// following nop. This is arguably wrong since we have
|
|
// conflicting information. On the one hand a global
|
|
// symbol and on the other a local call sequence, but
|
|
// don't error for this special case.
|
|
// It isn't possible to cheaply verify we have exactly
|
|
// such a call. Allow all calls to the same section.
|
|
bool ok = false;
|
|
Address code = value;
|
|
if (gsym->source() == Symbol::FROM_OBJECT
|
|
&& gsym->object() == object)
|
|
{
|
|
unsigned int dest_shndx = 0;
|
|
if (target->abiversion() < 2)
|
|
{
|
|
Address addend = rela.get_r_addend();
|
|
Address opdent = psymval->value(object, addend);
|
|
code = target->symval_for_branch(relinfo->symtab,
|
|
opdent, gsym, object,
|
|
&dest_shndx);
|
|
}
|
|
bool is_ordinary;
|
|
if (dest_shndx == 0)
|
|
dest_shndx = gsym->shndx(&is_ordinary);
|
|
ok = dest_shndx == relinfo->data_shndx;
|
|
}
|
|
if (!ok)
|
|
{
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("call lacks nop, can't restore toc; "
|
|
"recompile with -fPIC"));
|
|
value = code;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA)
|
|
{
|
|
// First instruction of a global dynamic sequence, arg setup insn.
|
|
const bool final = gsym == NULL || gsym->final_value_is_known();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_gd(final);
|
|
enum Got_type got_type = GOT_TYPE_STANDARD;
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
got_type = GOT_TYPE_TLSGD;
|
|
else if (tls_type == tls::TLSOPT_TO_IE)
|
|
got_type = GOT_TYPE_TPREL;
|
|
if (got_type != GOT_TYPE_STANDARD)
|
|
{
|
|
if (gsym != NULL)
|
|
{
|
|
gold_assert(gsym->has_got_offset(got_type));
|
|
value = gsym->got_offset(got_type);
|
|
}
|
|
else
|
|
{
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
|
|
gold_assert(object->local_has_got_offset(r_sym, got_type));
|
|
value = object->local_got_offset(r_sym, got_type);
|
|
}
|
|
value -= target->got_section()->got_base_offset(object);
|
|
}
|
|
if (tls_type == tls::TLSOPT_TO_IE)
|
|
{
|
|
if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO)
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
|
|
insn &= (1 << 26) - (1 << 16); // extract rt,ra from addi
|
|
if (size == 32)
|
|
insn |= 32 << 26; // lwz
|
|
else
|
|
insn |= 58 << 26; // ld
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
}
|
|
r_type += (elfcpp::R_POWERPC_GOT_TPREL16
|
|
- elfcpp::R_POWERPC_GOT_TLSGD16);
|
|
}
|
|
else if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO)
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = addis_3_13;
|
|
if (size == 32)
|
|
insn = addis_3_2;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_TPREL16_HA;
|
|
value = psymval->value(object, rela.get_r_addend());
|
|
}
|
|
else
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = nop;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
}
|
|
}
|
|
}
|
|
else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA)
|
|
{
|
|
// First instruction of a local dynamic sequence, arg setup insn.
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ld();
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
{
|
|
value = target->tlsld_got_offset();
|
|
value -= target->got_section()->got_base_offset(object);
|
|
}
|
|
else
|
|
{
|
|
gold_assert(tls_type == tls::TLSOPT_TO_LE);
|
|
if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO)
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = addis_3_13;
|
|
if (size == 32)
|
|
insn = addis_3_2;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_TPREL16_HA;
|
|
value = dtp_offset;
|
|
}
|
|
else
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = nop;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
}
|
|
}
|
|
}
|
|
else if (r_type == elfcpp::R_POWERPC_GOT_DTPREL16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_DTPREL16_LO
|
|
|| r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HI
|
|
|| r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HA)
|
|
{
|
|
// Accesses relative to a local dynamic sequence address,
|
|
// no optimisation here.
|
|
if (gsym != NULL)
|
|
{
|
|
gold_assert(gsym->has_got_offset(GOT_TYPE_DTPREL));
|
|
value = gsym->got_offset(GOT_TYPE_DTPREL);
|
|
}
|
|
else
|
|
{
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
|
|
gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_DTPREL));
|
|
value = object->local_got_offset(r_sym, GOT_TYPE_DTPREL);
|
|
}
|
|
value -= target->got_section()->got_base_offset(object);
|
|
}
|
|
else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA)
|
|
{
|
|
// First instruction of initial exec sequence.
|
|
const bool final = gsym == NULL || gsym->final_value_is_known();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ie(final);
|
|
if (tls_type == tls::TLSOPT_NONE)
|
|
{
|
|
if (gsym != NULL)
|
|
{
|
|
gold_assert(gsym->has_got_offset(GOT_TYPE_TPREL));
|
|
value = gsym->got_offset(GOT_TYPE_TPREL);
|
|
}
|
|
else
|
|
{
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
|
|
gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_TPREL));
|
|
value = object->local_got_offset(r_sym, GOT_TYPE_TPREL);
|
|
}
|
|
value -= target->got_section()->got_base_offset(object);
|
|
}
|
|
else
|
|
{
|
|
gold_assert(tls_type == tls::TLSOPT_TO_LE);
|
|
if (r_type == elfcpp::R_POWERPC_GOT_TPREL16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO)
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
|
|
insn &= (1 << 26) - (1 << 21); // extract rt from ld
|
|
if (size == 32)
|
|
insn |= addis_0_2;
|
|
else
|
|
insn |= addis_0_13;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_TPREL16_HA;
|
|
value = psymval->value(object, rela.get_r_addend());
|
|
}
|
|
else
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = nop;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
}
|
|
}
|
|
}
|
|
else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD)
|
|
|| (size == 32 && r_type == elfcpp::R_PPC_TLSGD))
|
|
{
|
|
// Second instruction of a global dynamic sequence,
|
|
// the __tls_get_addr call
|
|
this->expect_tls_get_addr_call(relinfo, relnum, rela.get_r_offset());
|
|
const bool final = gsym == NULL || gsym->final_value_is_known();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_gd(final);
|
|
if (tls_type != tls::TLSOPT_NONE)
|
|
{
|
|
if (tls_type == tls::TLSOPT_TO_IE)
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view);
|
|
Insn insn = add_3_3_13;
|
|
if (size == 32)
|
|
insn = add_3_3_2;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
}
|
|
else
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view);
|
|
Insn insn = addi_3_3;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_TPREL16_LO;
|
|
view += 2 * big_endian;
|
|
value = psymval->value(object, rela.get_r_addend());
|
|
}
|
|
this->skip_next_tls_get_addr_call();
|
|
}
|
|
}
|
|
else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD)
|
|
|| (size == 32 && r_type == elfcpp::R_PPC_TLSLD))
|
|
{
|
|
// Second instruction of a local dynamic sequence,
|
|
// the __tls_get_addr call
|
|
this->expect_tls_get_addr_call(relinfo, relnum, rela.get_r_offset());
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ld();
|
|
if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view);
|
|
Insn insn = addi_3_3;
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
this->skip_next_tls_get_addr_call();
|
|
r_type = elfcpp::R_POWERPC_TPREL16_LO;
|
|
view += 2 * big_endian;
|
|
value = dtp_offset;
|
|
}
|
|
}
|
|
else if (r_type == elfcpp::R_POWERPC_TLS)
|
|
{
|
|
// Second instruction of an initial exec sequence
|
|
const bool final = gsym == NULL || gsym->final_value_is_known();
|
|
const tls::Tls_optimization tls_type = target->optimize_tls_ie(final);
|
|
if (tls_type == tls::TLSOPT_TO_LE)
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view);
|
|
Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
|
|
unsigned int reg = size == 32 ? 2 : 13;
|
|
insn = at_tls_transform(insn, reg);
|
|
gold_assert(insn != 0);
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
r_type = elfcpp::R_POWERPC_TPREL16_LO;
|
|
view += 2 * big_endian;
|
|
value = psymval->value(object, rela.get_r_addend());
|
|
}
|
|
}
|
|
else if (!has_stub_value)
|
|
{
|
|
Address addend = 0;
|
|
unsigned int dest_shndx;
|
|
if (r_type != elfcpp::R_PPC_PLTREL24)
|
|
addend = rela.get_r_addend();
|
|
value = psymval->value(object, addend);
|
|
if (size == 64 && is_branch_reloc(r_type))
|
|
{
|
|
if (target->abiversion() >= 2)
|
|
{
|
|
if (gsym != NULL)
|
|
value += object->ppc64_local_entry_offset(gsym);
|
|
else
|
|
value += object->ppc64_local_entry_offset(r_sym);
|
|
}
|
|
else
|
|
value = target->symval_for_branch(relinfo->symtab, value,
|
|
gsym, object, &dest_shndx);
|
|
}
|
|
unsigned long max_branch_offset = max_branch_delta(r_type);
|
|
if (max_branch_offset != 0
|
|
&& value - address + max_branch_offset >= 2 * max_branch_offset)
|
|
{
|
|
Stub_table<size, big_endian>* stub_table
|
|
= object->stub_table(relinfo->data_shndx);
|
|
if (stub_table != NULL)
|
|
{
|
|
Address off = stub_table->find_long_branch_entry(object, value);
|
|
if (off != invalid_address)
|
|
{
|
|
value = (stub_table->stub_address() + stub_table->plt_size()
|
|
+ off);
|
|
has_stub_value = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_PPC64_REL64:
|
|
case elfcpp::R_POWERPC_REL32:
|
|
case elfcpp::R_POWERPC_REL24:
|
|
case elfcpp::R_PPC_PLTREL24:
|
|
case elfcpp::R_PPC_LOCAL24PC:
|
|
case elfcpp::R_POWERPC_REL16:
|
|
case elfcpp::R_POWERPC_REL16_LO:
|
|
case elfcpp::R_POWERPC_REL16_HI:
|
|
case elfcpp::R_POWERPC_REL16_HA:
|
|
case elfcpp::R_POWERPC_REL14:
|
|
case elfcpp::R_POWERPC_REL14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
|
|
value -= address;
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_TOC16:
|
|
case elfcpp::R_PPC64_TOC16_LO:
|
|
case elfcpp::R_PPC64_TOC16_HI:
|
|
case elfcpp::R_PPC64_TOC16_HA:
|
|
case elfcpp::R_PPC64_TOC16_DS:
|
|
case elfcpp::R_PPC64_TOC16_LO_DS:
|
|
// Subtract the TOC base address.
|
|
value -= (target->got_section()->output_section()->address()
|
|
+ object->toc_base_offset());
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_SECTOFF:
|
|
case elfcpp::R_POWERPC_SECTOFF_LO:
|
|
case elfcpp::R_POWERPC_SECTOFF_HI:
|
|
case elfcpp::R_POWERPC_SECTOFF_HA:
|
|
case elfcpp::R_PPC64_SECTOFF_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_LO_DS:
|
|
if (os != NULL)
|
|
value -= os->address();
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_TPREL16_DS:
|
|
case elfcpp::R_PPC64_TPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_TPREL16_HIGH:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHA:
|
|
if (size != 64)
|
|
// R_PPC_TLSGD, R_PPC_TLSLD, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HI
|
|
break;
|
|
case elfcpp::R_POWERPC_TPREL16:
|
|
case elfcpp::R_POWERPC_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_TPREL16_HA:
|
|
case elfcpp::R_POWERPC_TPREL:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHESTA:
|
|
// tls symbol values are relative to tls_segment()->vaddr()
|
|
value -= tp_offset;
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_DTPREL16_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
|
|
if (size != 64)
|
|
// R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16, R_PPC_EMB_NADDR16_LO
|
|
// R_PPC_EMB_NADDR16_HI, R_PPC_EMB_NADDR16_HA, R_PPC_EMB_SDAI16
|
|
break;
|
|
case elfcpp::R_POWERPC_DTPREL16:
|
|
case elfcpp::R_POWERPC_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_DTPREL16_HA:
|
|
case elfcpp::R_POWERPC_DTPREL:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGH:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHA:
|
|
// tls symbol values are relative to tls_segment()->vaddr()
|
|
value -= dtp_offset;
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR64_LOCAL:
|
|
if (gsym != NULL)
|
|
value += object->ppc64_local_entry_offset(gsym);
|
|
else
|
|
value += object->ppc64_local_entry_offset(r_sym);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
Insn branch_bit = 0;
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRTAKEN:
|
|
branch_bit = 1 << 21;
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view);
|
|
Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
|
|
insn &= ~(1 << 21);
|
|
insn |= branch_bit;
|
|
if (this->is_isa_v2)
|
|
{
|
|
// Set 'a' bit. This is 0b00010 in BO field for branch
|
|
// on CR(BI) insns (BO == 001at or 011at), and 0b01000
|
|
// for branch on CTR insns (BO == 1a00t or 1a01t).
|
|
if ((insn & (0x14 << 21)) == (0x04 << 21))
|
|
insn |= 0x02 << 21;
|
|
else if ((insn & (0x14 << 21)) == (0x10 << 21))
|
|
insn |= 0x08 << 21;
|
|
else
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
// Invert 'y' bit if not the default.
|
|
if (static_cast<Signed_address>(value) < 0)
|
|
insn ^= 1 << 21;
|
|
}
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (size == 64)
|
|
{
|
|
// Multi-instruction sequences that access the TOC can be
|
|
// optimized, eg. addis ra,r2,0; addi rb,ra,x;
|
|
// to nop; addi rb,r2,x;
|
|
switch (r_type)
|
|
{
|
|
default:
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HA:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
|
|
case elfcpp::R_POWERPC_GOT16_HA:
|
|
case elfcpp::R_PPC64_TOC16_HA:
|
|
if (parameters->options().toc_optimize())
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
|
|
if ((insn & ((0x3f << 26) | 0x1f << 16))
|
|
!= ((15u << 26) | (2 << 16)) /* addis rt,2,imm */)
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("toc optimization is not supported "
|
|
"for %#08x instruction"), insn);
|
|
else if (value + 0x8000 < 0x10000)
|
|
{
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, nop);
|
|
return true;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_GOT16_LO:
|
|
case elfcpp::R_PPC64_GOT16_LO_DS:
|
|
case elfcpp::R_PPC64_TOC16_LO:
|
|
case elfcpp::R_PPC64_TOC16_LO_DS:
|
|
if (parameters->options().toc_optimize())
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
|
|
if (!ok_lo_toc_insn(insn))
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("toc optimization is not supported "
|
|
"for %#08x instruction"), insn);
|
|
else if (value + 0x8000 < 0x10000)
|
|
{
|
|
if ((insn & (0x3f << 26)) == 12u << 26 /* addic */)
|
|
{
|
|
// Transform addic to addi when we change reg.
|
|
insn &= ~((0x3f << 26) | (0x1f << 16));
|
|
insn |= (14u << 26) | (2 << 16);
|
|
}
|
|
else
|
|
{
|
|
insn &= ~(0x1f << 16);
|
|
insn |= 2 << 16;
|
|
}
|
|
elfcpp::Swap<32, big_endian>::writeval(iview, insn);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
typename Reloc::Overflow_check overflow = Reloc::CHECK_NONE;
|
|
elfcpp::Shdr<size, big_endian> shdr(relinfo->data_shdr);
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_ADDR32:
|
|
case elfcpp::R_POWERPC_UADDR32:
|
|
if (size == 64)
|
|
overflow = Reloc::CHECK_BITFIELD;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_REL32:
|
|
if (size == 64)
|
|
overflow = Reloc::CHECK_SIGNED;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_UADDR16:
|
|
overflow = Reloc::CHECK_BITFIELD;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_ADDR16:
|
|
// We really should have three separate relocations,
|
|
// one for 16-bit data, one for insns with 16-bit signed fields,
|
|
// and one for insns with 16-bit unsigned fields.
|
|
overflow = Reloc::CHECK_BITFIELD;
|
|
if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0)
|
|
overflow = Reloc::CHECK_LOW_INSN;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_ADDR16_HI:
|
|
case elfcpp::R_POWERPC_ADDR16_HA:
|
|
case elfcpp::R_POWERPC_GOT16_HI:
|
|
case elfcpp::R_POWERPC_GOT16_HA:
|
|
case elfcpp::R_POWERPC_PLT16_HI:
|
|
case elfcpp::R_POWERPC_PLT16_HA:
|
|
case elfcpp::R_POWERPC_SECTOFF_HI:
|
|
case elfcpp::R_POWERPC_SECTOFF_HA:
|
|
case elfcpp::R_PPC64_TOC16_HI:
|
|
case elfcpp::R_PPC64_TOC16_HA:
|
|
case elfcpp::R_PPC64_PLTGOT16_HI:
|
|
case elfcpp::R_PPC64_PLTGOT16_HA:
|
|
case elfcpp::R_POWERPC_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_TPREL16_HA:
|
|
case elfcpp::R_POWERPC_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_DTPREL16_HA:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HA:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
|
|
case elfcpp::R_POWERPC_REL16_HI:
|
|
case elfcpp::R_POWERPC_REL16_HA:
|
|
if (size != 32)
|
|
overflow = Reloc::CHECK_HIGH_INSN;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_REL16:
|
|
case elfcpp::R_PPC64_TOC16:
|
|
case elfcpp::R_POWERPC_GOT16:
|
|
case elfcpp::R_POWERPC_SECTOFF:
|
|
case elfcpp::R_POWERPC_TPREL16:
|
|
case elfcpp::R_POWERPC_DTPREL16:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16:
|
|
overflow = Reloc::CHECK_LOW_INSN;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_ADDR24:
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
case elfcpp::R_PPC64_ADDR16_DS:
|
|
case elfcpp::R_POWERPC_REL24:
|
|
case elfcpp::R_PPC_PLTREL24:
|
|
case elfcpp::R_PPC_LOCAL24PC:
|
|
case elfcpp::R_PPC64_TPREL16_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_DS:
|
|
case elfcpp::R_PPC64_TOC16_DS:
|
|
case elfcpp::R_PPC64_GOT16_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_DS:
|
|
case elfcpp::R_POWERPC_REL14:
|
|
case elfcpp::R_POWERPC_REL14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
|
|
overflow = Reloc::CHECK_SIGNED;
|
|
break;
|
|
}
|
|
|
|
if (overflow == Reloc::CHECK_LOW_INSN
|
|
|| overflow == Reloc::CHECK_HIGH_INSN)
|
|
{
|
|
Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
|
|
Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
|
|
|
|
overflow = Reloc::CHECK_SIGNED;
|
|
if ((insn & (0x3f << 26)) == 10u << 26 /* cmpli */)
|
|
overflow = Reloc::CHECK_BITFIELD;
|
|
else if (overflow == Reloc::CHECK_LOW_INSN
|
|
? ((insn & (0x3f << 26)) == 28u << 26 /* andi */
|
|
|| (insn & (0x3f << 26)) == 24u << 26 /* ori */
|
|
|| (insn & (0x3f << 26)) == 26u << 26 /* xori */)
|
|
: ((insn & (0x3f << 26)) == 29u << 26 /* andis */
|
|
|| (insn & (0x3f << 26)) == 25u << 26 /* oris */
|
|
|| (insn & (0x3f << 26)) == 27u << 26 /* xoris */))
|
|
overflow = Reloc::CHECK_UNSIGNED;
|
|
}
|
|
|
|
typename Powerpc_relocate_functions<size, big_endian>::Status status
|
|
= Powerpc_relocate_functions<size, big_endian>::STATUS_OK;
|
|
switch (r_type)
|
|
{
|
|
case elfcpp::R_POWERPC_NONE:
|
|
case elfcpp::R_POWERPC_TLS:
|
|
case elfcpp::R_POWERPC_GNU_VTINHERIT:
|
|
case elfcpp::R_POWERPC_GNU_VTENTRY:
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR64:
|
|
case elfcpp::R_PPC64_REL64:
|
|
case elfcpp::R_PPC64_TOC:
|
|
case elfcpp::R_PPC64_ADDR64_LOCAL:
|
|
Reloc::addr64(view, value);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_TPREL:
|
|
case elfcpp::R_POWERPC_DTPREL:
|
|
if (size == 64)
|
|
Reloc::addr64(view, value);
|
|
else
|
|
status = Reloc::addr32(view, value, overflow);
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_UADDR64:
|
|
Reloc::addr64_u(view, value);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_ADDR32:
|
|
status = Reloc::addr32(view, value, overflow);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_REL32:
|
|
case elfcpp::R_POWERPC_UADDR32:
|
|
status = Reloc::addr32_u(view, value, overflow);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_ADDR24:
|
|
case elfcpp::R_POWERPC_REL24:
|
|
case elfcpp::R_PPC_PLTREL24:
|
|
case elfcpp::R_PPC_LOCAL24PC:
|
|
status = Reloc::addr24(view, value, overflow);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
|
|
if (size == 64)
|
|
{
|
|
status = Reloc::addr16_ds(view, value, overflow);
|
|
break;
|
|
}
|
|
case elfcpp::R_POWERPC_ADDR16:
|
|
case elfcpp::R_POWERPC_REL16:
|
|
case elfcpp::R_PPC64_TOC16:
|
|
case elfcpp::R_POWERPC_GOT16:
|
|
case elfcpp::R_POWERPC_SECTOFF:
|
|
case elfcpp::R_POWERPC_TPREL16:
|
|
case elfcpp::R_POWERPC_DTPREL16:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16:
|
|
case elfcpp::R_POWERPC_ADDR16_LO:
|
|
case elfcpp::R_POWERPC_REL16_LO:
|
|
case elfcpp::R_PPC64_TOC16_LO:
|
|
case elfcpp::R_POWERPC_GOT16_LO:
|
|
case elfcpp::R_POWERPC_SECTOFF_LO:
|
|
case elfcpp::R_POWERPC_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_LO:
|
|
status = Reloc::addr16(view, value, overflow);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_UADDR16:
|
|
status = Reloc::addr16_u(view, value, overflow);
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR16_HIGH:
|
|
case elfcpp::R_PPC64_TPREL16_HIGH:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGH:
|
|
if (size == 32)
|
|
// R_PPC_EMB_MRKREF, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HA
|
|
goto unsupp;
|
|
case elfcpp::R_POWERPC_ADDR16_HI:
|
|
case elfcpp::R_POWERPC_REL16_HI:
|
|
case elfcpp::R_PPC64_TOC16_HI:
|
|
case elfcpp::R_POWERPC_GOT16_HI:
|
|
case elfcpp::R_POWERPC_SECTOFF_HI:
|
|
case elfcpp::R_POWERPC_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HI:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HI:
|
|
Reloc::addr16_hi(view, value);
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR16_HIGHA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHA:
|
|
if (size == 32)
|
|
// R_PPC_EMB_RELSEC16, R_PPC_EMB_RELST_HI, R_PPC_EMB_BIT_FLD
|
|
goto unsupp;
|
|
case elfcpp::R_POWERPC_ADDR16_HA:
|
|
case elfcpp::R_POWERPC_REL16_HA:
|
|
case elfcpp::R_PPC64_TOC16_HA:
|
|
case elfcpp::R_POWERPC_GOT16_HA:
|
|
case elfcpp::R_POWERPC_SECTOFF_HA:
|
|
case elfcpp::R_POWERPC_TPREL16_HA:
|
|
case elfcpp::R_POWERPC_DTPREL16_HA:
|
|
case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
|
|
case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
|
|
case elfcpp::R_POWERPC_GOT_TPREL16_HA:
|
|
case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
|
|
Reloc::addr16_ha(view, value);
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHER:
|
|
if (size == 32)
|
|
// R_PPC_EMB_NADDR16_LO
|
|
goto unsupp;
|
|
case elfcpp::R_PPC64_ADDR16_HIGHER:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHER:
|
|
Reloc::addr16_hi2(view, value);
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHERA:
|
|
if (size == 32)
|
|
// R_PPC_EMB_NADDR16_HI
|
|
goto unsupp;
|
|
case elfcpp::R_PPC64_ADDR16_HIGHERA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHERA:
|
|
Reloc::addr16_ha2(view, value);
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHEST:
|
|
if (size == 32)
|
|
// R_PPC_EMB_NADDR16_HA
|
|
goto unsupp;
|
|
case elfcpp::R_PPC64_ADDR16_HIGHEST:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHEST:
|
|
Reloc::addr16_hi3(view, value);
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
|
|
if (size == 32)
|
|
// R_PPC_EMB_SDAI16
|
|
goto unsupp;
|
|
case elfcpp::R_PPC64_ADDR16_HIGHESTA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHESTA:
|
|
Reloc::addr16_ha3(view, value);
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_DTPREL16_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_LO_DS:
|
|
if (size == 32)
|
|
// R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16
|
|
goto unsupp;
|
|
case elfcpp::R_PPC64_TPREL16_DS:
|
|
case elfcpp::R_PPC64_TPREL16_LO_DS:
|
|
if (size == 32)
|
|
// R_PPC_TLSGD, R_PPC_TLSLD
|
|
break;
|
|
case elfcpp::R_PPC64_ADDR16_DS:
|
|
case elfcpp::R_PPC64_ADDR16_LO_DS:
|
|
case elfcpp::R_PPC64_TOC16_DS:
|
|
case elfcpp::R_PPC64_TOC16_LO_DS:
|
|
case elfcpp::R_PPC64_GOT16_DS:
|
|
case elfcpp::R_PPC64_GOT16_LO_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_LO_DS:
|
|
status = Reloc::addr16_ds(view, value, overflow);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
case elfcpp::R_POWERPC_REL14:
|
|
case elfcpp::R_POWERPC_REL14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
|
|
status = Reloc::addr14(view, value, overflow);
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_COPY:
|
|
case elfcpp::R_POWERPC_GLOB_DAT:
|
|
case elfcpp::R_POWERPC_JMP_SLOT:
|
|
case elfcpp::R_POWERPC_RELATIVE:
|
|
case elfcpp::R_POWERPC_DTPMOD:
|
|
case elfcpp::R_PPC64_JMP_IREL:
|
|
case elfcpp::R_POWERPC_IRELATIVE:
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("unexpected reloc %u in object file"),
|
|
r_type);
|
|
break;
|
|
|
|
case elfcpp::R_PPC_EMB_SDA21:
|
|
if (size == 32)
|
|
goto unsupp;
|
|
else
|
|
{
|
|
// R_PPC64_TOCSAVE. For the time being this can be ignored.
|
|
}
|
|
break;
|
|
|
|
case elfcpp::R_PPC_EMB_SDA2I16:
|
|
case elfcpp::R_PPC_EMB_SDA2REL:
|
|
if (size == 32)
|
|
goto unsupp;
|
|
// R_PPC64_TLSGD, R_PPC64_TLSLD
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_PLT32:
|
|
case elfcpp::R_POWERPC_PLTREL32:
|
|
case elfcpp::R_POWERPC_PLT16_LO:
|
|
case elfcpp::R_POWERPC_PLT16_HI:
|
|
case elfcpp::R_POWERPC_PLT16_HA:
|
|
case elfcpp::R_PPC_SDAREL16:
|
|
case elfcpp::R_POWERPC_ADDR30:
|
|
case elfcpp::R_PPC64_PLT64:
|
|
case elfcpp::R_PPC64_PLTREL64:
|
|
case elfcpp::R_PPC64_PLTGOT16:
|
|
case elfcpp::R_PPC64_PLTGOT16_LO:
|
|
case elfcpp::R_PPC64_PLTGOT16_HI:
|
|
case elfcpp::R_PPC64_PLTGOT16_HA:
|
|
case elfcpp::R_PPC64_PLT16_LO_DS:
|
|
case elfcpp::R_PPC64_PLTGOT16_DS:
|
|
case elfcpp::R_PPC64_PLTGOT16_LO_DS:
|
|
case elfcpp::R_PPC_EMB_RELSDA:
|
|
case elfcpp::R_PPC_TOC16:
|
|
default:
|
|
unsupp:
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("unsupported reloc %u"),
|
|
r_type);
|
|
break;
|
|
}
|
|
if (status != Powerpc_relocate_functions<size, big_endian>::STATUS_OK
|
|
&& (has_stub_value
|
|
|| !(gsym != NULL
|
|
&& gsym->is_weak_undefined()
|
|
&& is_branch_reloc(r_type))))
|
|
{
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("relocation overflow"));
|
|
if (has_stub_value)
|
|
gold_info(_("try relinking with a smaller --stub-group-size"));
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Relocate section data.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::relocate_section(
|
|
const Relocate_info<size, big_endian>* relinfo,
|
|
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 address,
|
|
section_size_type view_size,
|
|
const Reloc_symbol_changes* reloc_symbol_changes)
|
|
{
|
|
typedef Target_powerpc<size, big_endian> Powerpc;
|
|
typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
|
|
typedef typename Target_powerpc<size, big_endian>::Relocate_comdat_behavior
|
|
Powerpc_comdat_behavior;
|
|
|
|
gold_assert(sh_type == elfcpp::SHT_RELA);
|
|
|
|
gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
|
|
Powerpc_relocate, Powerpc_comdat_behavior>(
|
|
relinfo,
|
|
this,
|
|
prelocs,
|
|
reloc_count,
|
|
output_section,
|
|
needs_special_offset_handling,
|
|
view,
|
|
address,
|
|
view_size,
|
|
reloc_symbol_changes);
|
|
}
|
|
|
|
class Powerpc_scan_relocatable_reloc
|
|
{
|
|
public:
|
|
// Return the strategy to use for a local symbol which is not a
|
|
// section symbol, given the relocation type.
|
|
inline Relocatable_relocs::Reloc_strategy
|
|
local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym)
|
|
{
|
|
if (r_type == 0 && r_sym == 0)
|
|
return Relocatable_relocs::RELOC_DISCARD;
|
|
return Relocatable_relocs::RELOC_COPY;
|
|
}
|
|
|
|
// Return the strategy to use for a local symbol which is a section
|
|
// symbol, given the relocation type.
|
|
inline Relocatable_relocs::Reloc_strategy
|
|
local_section_strategy(unsigned int, Relobj*)
|
|
{
|
|
return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
|
|
}
|
|
|
|
// Return the strategy to use for a global symbol, given the
|
|
// relocation type, the object, and the symbol index.
|
|
inline Relocatable_relocs::Reloc_strategy
|
|
global_strategy(unsigned int r_type, Relobj*, unsigned int)
|
|
{
|
|
if (r_type == elfcpp::R_PPC_PLTREL24)
|
|
return Relocatable_relocs::RELOC_SPECIAL;
|
|
return Relocatable_relocs::RELOC_COPY;
|
|
}
|
|
};
|
|
|
|
// Scan the relocs during a relocatable link.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::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* rr)
|
|
{
|
|
gold_assert(sh_type == elfcpp::SHT_RELA);
|
|
|
|
gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
|
|
Powerpc_scan_relocatable_reloc>(
|
|
symtab,
|
|
layout,
|
|
object,
|
|
data_shndx,
|
|
prelocs,
|
|
reloc_count,
|
|
output_section,
|
|
needs_special_offset_handling,
|
|
local_symbol_count,
|
|
plocal_symbols,
|
|
rr);
|
|
}
|
|
|
|
// Emit relocations for a section.
|
|
// This is a modified version of the function by the same name in
|
|
// target-reloc.h. Using relocate_special_relocatable for
|
|
// R_PPC_PLTREL24 would require duplication of the entire body of the
|
|
// loop, so we may as well duplicate the whole thing.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Target_powerpc<size, big_endian>::relocate_relocs(
|
|
const Relocate_info<size, big_endian>* relinfo,
|
|
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,
|
|
const Relocatable_relocs* rr,
|
|
unsigned char*,
|
|
Address view_address,
|
|
section_size_type,
|
|
unsigned char* reloc_view,
|
|
section_size_type reloc_view_size)
|
|
{
|
|
gold_assert(sh_type == elfcpp::SHT_RELA);
|
|
|
|
typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc
|
|
Reltype;
|
|
typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc_write
|
|
Reltype_write;
|
|
const int reloc_size
|
|
= Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;
|
|
|
|
Powerpc_relobj<size, big_endian>* const object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object);
|
|
const unsigned int local_count = object->local_symbol_count();
|
|
unsigned int got2_shndx = object->got2_shndx();
|
|
Address got2_addend = 0;
|
|
if (got2_shndx != 0)
|
|
{
|
|
got2_addend = object->get_output_section_offset(got2_shndx);
|
|
gold_assert(got2_addend != invalid_address);
|
|
}
|
|
|
|
unsigned char* pwrite = reloc_view;
|
|
bool zap_next = false;
|
|
for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
|
|
{
|
|
Relocatable_relocs::Reloc_strategy strategy = rr->strategy(i);
|
|
if (strategy == Relocatable_relocs::RELOC_DISCARD)
|
|
continue;
|
|
|
|
Reltype reloc(prelocs);
|
|
Reltype_write reloc_write(pwrite);
|
|
|
|
Address offset = reloc.get_r_offset();
|
|
typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
|
|
unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
|
|
const unsigned int orig_r_sym = r_sym;
|
|
typename elfcpp::Elf_types<size>::Elf_Swxword addend
|
|
= reloc.get_r_addend();
|
|
const Symbol* gsym = NULL;
|
|
|
|
if (zap_next)
|
|
{
|
|
// We could arrange to discard these and other relocs for
|
|
// tls optimised sequences in the strategy methods, but for
|
|
// now do as BFD ld does.
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
zap_next = false;
|
|
}
|
|
|
|
// Get the new symbol index.
|
|
if (r_sym < local_count)
|
|
{
|
|
switch (strategy)
|
|
{
|
|
case Relocatable_relocs::RELOC_COPY:
|
|
case Relocatable_relocs::RELOC_SPECIAL:
|
|
if (r_sym != 0)
|
|
{
|
|
r_sym = object->symtab_index(r_sym);
|
|
gold_assert(r_sym != -1U);
|
|
}
|
|
break;
|
|
|
|
case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA:
|
|
{
|
|
// We are adjusting a section symbol. We need to find
|
|
// the symbol table index of the section symbol for
|
|
// the output section corresponding to input section
|
|
// in which this symbol is defined.
|
|
gold_assert(r_sym < local_count);
|
|
bool is_ordinary;
|
|
unsigned int shndx =
|
|
object->local_symbol_input_shndx(r_sym, &is_ordinary);
|
|
gold_assert(is_ordinary);
|
|
Output_section* os = object->output_section(shndx);
|
|
gold_assert(os != NULL);
|
|
gold_assert(os->needs_symtab_index());
|
|
r_sym = os->symtab_index();
|
|
}
|
|
break;
|
|
|
|
default:
|
|
gold_unreachable();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
gsym = object->global_symbol(r_sym);
|
|
gold_assert(gsym != NULL);
|
|
if (gsym->is_forwarder())
|
|
gsym = relinfo->symtab->resolve_forwards(gsym);
|
|
|
|
gold_assert(gsym->has_symtab_index());
|
|
r_sym = gsym->symtab_index();
|
|
}
|
|
|
|
// Get the new offset--the location in the output section where
|
|
// this relocation should be applied.
|
|
if (static_cast<Address>(offset_in_output_section) != invalid_address)
|
|
offset += offset_in_output_section;
|
|
else
|
|
{
|
|
section_offset_type sot_offset =
|
|
convert_types<section_offset_type, Address>(offset);
|
|
section_offset_type new_sot_offset =
|
|
output_section->output_offset(object, relinfo->data_shndx,
|
|
sot_offset);
|
|
gold_assert(new_sot_offset != -1);
|
|
offset = new_sot_offset;
|
|
}
|
|
|
|
// In an object file, r_offset is an offset within the section.
|
|
// In an executable or dynamic object, generated by
|
|
// --emit-relocs, r_offset is an absolute address.
|
|
if (!parameters->options().relocatable())
|
|
{
|
|
offset += view_address;
|
|
if (static_cast<Address>(offset_in_output_section) != invalid_address)
|
|
offset -= offset_in_output_section;
|
|
}
|
|
|
|
// Handle the reloc addend based on the strategy.
|
|
if (strategy == Relocatable_relocs::RELOC_COPY)
|
|
;
|
|
else if (strategy == Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA)
|
|
{
|
|
const Symbol_value<size>* psymval = object->local_symbol(orig_r_sym);
|
|
addend = psymval->value(object, addend);
|
|
}
|
|
else if (strategy == Relocatable_relocs::RELOC_SPECIAL)
|
|
{
|
|
if (addend >= 32768)
|
|
addend += got2_addend;
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
|
|
if (!parameters->options().relocatable())
|
|
{
|
|
if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA)
|
|
{
|
|
// First instruction of a global dynamic sequence,
|
|
// arg setup insn.
|
|
const bool final = gsym == NULL || gsym->final_value_is_known();
|
|
switch (this->optimize_tls_gd(final))
|
|
{
|
|
case tls::TLSOPT_TO_IE:
|
|
r_type += (elfcpp::R_POWERPC_GOT_TPREL16
|
|
- elfcpp::R_POWERPC_GOT_TLSGD16);
|
|
break;
|
|
case tls::TLSOPT_TO_LE:
|
|
if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO)
|
|
r_type = elfcpp::R_POWERPC_TPREL16_HA;
|
|
else
|
|
{
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
offset -= 2 * big_endian;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA)
|
|
{
|
|
// First instruction of a local dynamic sequence,
|
|
// arg setup insn.
|
|
if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE)
|
|
{
|
|
if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO)
|
|
{
|
|
r_type = elfcpp::R_POWERPC_TPREL16_HA;
|
|
const Output_section* os = relinfo->layout->tls_segment()
|
|
->first_section();
|
|
gold_assert(os != NULL);
|
|
gold_assert(os->needs_symtab_index());
|
|
r_sym = os->symtab_index();
|
|
addend = dtp_offset;
|
|
}
|
|
else
|
|
{
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
offset -= 2 * big_endian;
|
|
}
|
|
}
|
|
}
|
|
else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA)
|
|
{
|
|
// First instruction of initial exec sequence.
|
|
const bool final = gsym == NULL || gsym->final_value_is_known();
|
|
if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE)
|
|
{
|
|
if (r_type == elfcpp::R_POWERPC_GOT_TPREL16
|
|
|| r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO)
|
|
r_type = elfcpp::R_POWERPC_TPREL16_HA;
|
|
else
|
|
{
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
offset -= 2 * big_endian;
|
|
}
|
|
}
|
|
}
|
|
else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD)
|
|
|| (size == 32 && r_type == elfcpp::R_PPC_TLSGD))
|
|
{
|
|
// Second instruction of a global dynamic sequence,
|
|
// the __tls_get_addr call
|
|
const bool final = gsym == NULL || gsym->final_value_is_known();
|
|
switch (this->optimize_tls_gd(final))
|
|
{
|
|
case tls::TLSOPT_TO_IE:
|
|
r_type = elfcpp::R_POWERPC_NONE;
|
|
zap_next = true;
|
|
break;
|
|
case tls::TLSOPT_TO_LE:
|
|
r_type = elfcpp::R_POWERPC_TPREL16_LO;
|
|
offset += 2 * big_endian;
|
|
zap_next = true;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD)
|
|
|| (size == 32 && r_type == elfcpp::R_PPC_TLSLD))
|
|
{
|
|
// Second instruction of a local dynamic sequence,
|
|
// the __tls_get_addr call
|
|
if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE)
|
|
{
|
|
const Output_section* os = relinfo->layout->tls_segment()
|
|
->first_section();
|
|
gold_assert(os != NULL);
|
|
gold_assert(os->needs_symtab_index());
|
|
r_sym = os->symtab_index();
|
|
addend = dtp_offset;
|
|
r_type = elfcpp::R_POWERPC_TPREL16_LO;
|
|
offset += 2 * big_endian;
|
|
zap_next = true;
|
|
}
|
|
}
|
|
else if (r_type == elfcpp::R_POWERPC_TLS)
|
|
{
|
|
// Second instruction of an initial exec sequence
|
|
const bool final = gsym == NULL || gsym->final_value_is_known();
|
|
if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE)
|
|
{
|
|
r_type = elfcpp::R_POWERPC_TPREL16_LO;
|
|
offset += 2 * big_endian;
|
|
}
|
|
}
|
|
}
|
|
|
|
reloc_write.put_r_offset(offset);
|
|
reloc_write.put_r_info(elfcpp::elf_r_info<size>(r_sym, r_type));
|
|
reloc_write.put_r_addend(addend);
|
|
|
|
pwrite += reloc_size;
|
|
}
|
|
|
|
gold_assert(static_cast<section_size_type>(pwrite - reloc_view)
|
|
== reloc_view_size);
|
|
}
|
|
|
|
// Return the value to use for a dynamic symbol which requires special
|
|
// treatment. This is how we support equality comparisons of function
|
|
// pointers across shared library boundaries, as described in the
|
|
// processor specific ABI supplement.
|
|
|
|
template<int size, bool big_endian>
|
|
uint64_t
|
|
Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
|
|
{
|
|
if (size == 32)
|
|
{
|
|
gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
|
|
for (typename Stub_tables::const_iterator p = this->stub_tables_.begin();
|
|
p != this->stub_tables_.end();
|
|
++p)
|
|
{
|
|
Address off = (*p)->find_plt_call_entry(gsym);
|
|
if (off != invalid_address)
|
|
return (*p)->stub_address() + off;
|
|
}
|
|
}
|
|
else if (this->abiversion() >= 2)
|
|
{
|
|
unsigned int off = this->glink_section()->find_global_entry(gsym);
|
|
if (off != (unsigned int)-1)
|
|
return this->glink_section()->global_entry_address() + off;
|
|
}
|
|
gold_unreachable();
|
|
}
|
|
|
|
// Return the PLT address to use for a local symbol.
|
|
template<int size, bool big_endian>
|
|
uint64_t
|
|
Target_powerpc<size, big_endian>::do_plt_address_for_local(
|
|
const Relobj* object,
|
|
unsigned int symndx) const
|
|
{
|
|
if (size == 32)
|
|
{
|
|
const Sized_relobj<size, big_endian>* relobj
|
|
= static_cast<const Sized_relobj<size, big_endian>*>(object);
|
|
for (typename Stub_tables::const_iterator p = this->stub_tables_.begin();
|
|
p != this->stub_tables_.end();
|
|
++p)
|
|
{
|
|
Address off = (*p)->find_plt_call_entry(relobj->sized_relobj(),
|
|
symndx);
|
|
if (off != invalid_address)
|
|
return (*p)->stub_address() + off;
|
|
}
|
|
}
|
|
gold_unreachable();
|
|
}
|
|
|
|
// Return the PLT address to use for a global symbol.
|
|
template<int size, bool big_endian>
|
|
uint64_t
|
|
Target_powerpc<size, big_endian>::do_plt_address_for_global(
|
|
const Symbol* gsym) const
|
|
{
|
|
if (size == 32)
|
|
{
|
|
for (typename Stub_tables::const_iterator p = this->stub_tables_.begin();
|
|
p != this->stub_tables_.end();
|
|
++p)
|
|
{
|
|
Address off = (*p)->find_plt_call_entry(gsym);
|
|
if (off != invalid_address)
|
|
return (*p)->stub_address() + off;
|
|
}
|
|
}
|
|
else if (this->abiversion() >= 2)
|
|
{
|
|
unsigned int off = this->glink_section()->find_global_entry(gsym);
|
|
if (off != (unsigned int)-1)
|
|
return this->glink_section()->global_entry_address() + off;
|
|
}
|
|
gold_unreachable();
|
|
}
|
|
|
|
// Return the offset to use for the GOT_INDX'th got entry which is
|
|
// for a local tls symbol specified by OBJECT, SYMNDX.
|
|
template<int size, bool big_endian>
|
|
int64_t
|
|
Target_powerpc<size, big_endian>::do_tls_offset_for_local(
|
|
const Relobj* object,
|
|
unsigned int symndx,
|
|
unsigned int got_indx) const
|
|
{
|
|
const Powerpc_relobj<size, big_endian>* ppc_object
|
|
= static_cast<const Powerpc_relobj<size, big_endian>*>(object);
|
|
if (ppc_object->local_symbol(symndx)->is_tls_symbol())
|
|
{
|
|
for (Got_type got_type = GOT_TYPE_TLSGD;
|
|
got_type <= GOT_TYPE_TPREL;
|
|
got_type = Got_type(got_type + 1))
|
|
if (ppc_object->local_has_got_offset(symndx, got_type))
|
|
{
|
|
unsigned int off = ppc_object->local_got_offset(symndx, got_type);
|
|
if (got_type == GOT_TYPE_TLSGD)
|
|
off += size / 8;
|
|
if (off == got_indx * (size / 8))
|
|
{
|
|
if (got_type == GOT_TYPE_TPREL)
|
|
return -tp_offset;
|
|
else
|
|
return -dtp_offset;
|
|
}
|
|
}
|
|
}
|
|
gold_unreachable();
|
|
}
|
|
|
|
// Return the offset to use for the GOT_INDX'th got entry which is
|
|
// for global tls symbol GSYM.
|
|
template<int size, bool big_endian>
|
|
int64_t
|
|
Target_powerpc<size, big_endian>::do_tls_offset_for_global(
|
|
Symbol* gsym,
|
|
unsigned int got_indx) const
|
|
{
|
|
if (gsym->type() == elfcpp::STT_TLS)
|
|
{
|
|
for (Got_type got_type = GOT_TYPE_TLSGD;
|
|
got_type <= GOT_TYPE_TPREL;
|
|
got_type = Got_type(got_type + 1))
|
|
if (gsym->has_got_offset(got_type))
|
|
{
|
|
unsigned int off = gsym->got_offset(got_type);
|
|
if (got_type == GOT_TYPE_TLSGD)
|
|
off += size / 8;
|
|
if (off == got_indx * (size / 8))
|
|
{
|
|
if (got_type == GOT_TYPE_TPREL)
|
|
return -tp_offset;
|
|
else
|
|
return -dtp_offset;
|
|
}
|
|
}
|
|
}
|
|
gold_unreachable();
|
|
}
|
|
|
|
// The selector for powerpc object files.
|
|
|
|
template<int size, bool big_endian>
|
|
class Target_selector_powerpc : public Target_selector
|
|
{
|
|
public:
|
|
Target_selector_powerpc()
|
|
: Target_selector(size == 64 ? elfcpp::EM_PPC64 : elfcpp::EM_PPC,
|
|
size, big_endian,
|
|
(size == 64
|
|
? (big_endian ? "elf64-powerpc" : "elf64-powerpcle")
|
|
: (big_endian ? "elf32-powerpc" : "elf32-powerpcle")),
|
|
(size == 64
|
|
? (big_endian ? "elf64ppc" : "elf64lppc")
|
|
: (big_endian ? "elf32ppc" : "elf32lppc")))
|
|
{ }
|
|
|
|
virtual Target*
|
|
do_instantiate_target()
|
|
{ return new Target_powerpc<size, big_endian>(); }
|
|
};
|
|
|
|
Target_selector_powerpc<32, true> target_selector_ppc32;
|
|
Target_selector_powerpc<32, false> target_selector_ppc32le;
|
|
Target_selector_powerpc<64, true> target_selector_ppc64;
|
|
Target_selector_powerpc<64, false> target_selector_ppc64le;
|
|
|
|
// Instantiate these constants for -O0
|
|
template<int size, bool big_endian>
|
|
const int Output_data_glink<size, big_endian>::pltresolve_size;
|
|
template<int size, bool big_endian>
|
|
const typename Output_data_glink<size, big_endian>::Address
|
|
Output_data_glink<size, big_endian>::invalid_address;
|
|
template<int size, bool big_endian>
|
|
const typename Stub_table<size, big_endian>::Address
|
|
Stub_table<size, big_endian>::invalid_address;
|
|
template<int size, bool big_endian>
|
|
const typename Target_powerpc<size, big_endian>::Address
|
|
Target_powerpc<size, big_endian>::invalid_address;
|
|
|
|
} // End anonymous namespace.
|