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f3a0ed298a
(Target_powerpc::do_finalize_sections): Call it. (Output_data_save_res): New class and supporting functions. (Target_powerpc::symval_for_branch): Only look up .opd entry for normal symbols defined in object files.
5594 lines
164 KiB
C++
5594 lines
164 KiB
C++
// powerpc.cc -- powerpc target support for gold.
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// Copyright 2008, 2009, 2010, 2011, 2012 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 "elfcpp.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_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 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 typename elfcpp::Elf_types<size>::Elf_Off Offset;
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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), opd_valid_(false), opd_ent_(), access_from_map_()
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{ }
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~Powerpc_relobj()
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{ }
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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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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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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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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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// 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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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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Offset 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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// 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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};
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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), glink_(NULL), rela_dyn_(NULL),
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copy_relocs_(elfcpp::R_POWERPC_COPY),
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dynbss_(NULL), tlsld_got_offset_(-1U)
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{
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}
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// Process the relocations to determine unreferenced sections for
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// garbage collection.
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void
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gc_process_relocs(Symbol_table* symtab,
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Layout* layout,
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Sized_relobj_file<size, big_endian>* object,
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unsigned int data_shndx,
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unsigned int sh_type,
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const unsigned char* prelocs,
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size_t reloc_count,
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Output_section* output_section,
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bool needs_special_offset_handling,
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size_t local_symbol_count,
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const unsigned char* plocal_symbols);
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// Scan the relocations to look for symbol adjustments.
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void
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scan_relocs(Symbol_table* symtab,
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Layout* layout,
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Sized_relobj_file<size, big_endian>* object,
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unsigned int data_shndx,
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unsigned int sh_type,
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const unsigned char* prelocs,
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size_t reloc_count,
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Output_section* output_section,
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bool needs_special_offset_handling,
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size_t local_symbol_count,
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const unsigned char* plocal_symbols);
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// Map input .toc section to output .got section.
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const char*
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do_output_section_name(const Relobj*, const char* name, size_t* plen) const
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{
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if (size == 64 && strcmp(name, ".toc") == 0)
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{
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*plen = 4;
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return ".got";
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}
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return NULL;
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}
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// Provide linker defined save/restore functions.
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void
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define_save_restore_funcs(Layout*, Symbol_table*);
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// Finalize the sections.
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void
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do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
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// Return the value to use for a dynamic which requires special
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// treatment.
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uint64_t
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do_dynsym_value(const Symbol*) const;
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// Return the PLT address to use for a local symbol.
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uint64_t
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do_plt_address_for_local(const Relobj*, unsigned int) const;
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// Return the PLT address to use for a global symbol.
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uint64_t
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do_plt_address_for_global(const Symbol*) const;
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// Return the offset to use for the GOT_INDX'th got entry which is
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// for a local tls symbol specified by OBJECT, SYMNDX.
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int64_t
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do_tls_offset_for_local(const Relobj* object,
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unsigned int symndx,
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unsigned int got_indx) const;
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// Return the offset to use for the GOT_INDX'th got entry which is
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// for global tls symbol GSYM.
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int64_t
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do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const;
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// Relocate a section.
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void
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relocate_section(const Relocate_info<size, big_endian>*,
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unsigned int sh_type,
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const unsigned char* prelocs,
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size_t reloc_count,
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Output_section* output_section,
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bool needs_special_offset_handling,
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unsigned char* view,
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Address view_address,
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section_size_type view_size,
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const Reloc_symbol_changes*);
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// Scan the relocs during a relocatable link.
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void
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scan_relocatable_relocs(Symbol_table* symtab,
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Layout* layout,
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Sized_relobj_file<size, big_endian>* object,
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unsigned int data_shndx,
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unsigned int sh_type,
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const unsigned char* prelocs,
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size_t reloc_count,
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Output_section* output_section,
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bool needs_special_offset_handling,
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size_t local_symbol_count,
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const unsigned char* plocal_symbols,
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Relocatable_relocs*);
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// Emit relocations for a section.
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void
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relocate_relocs(const Relocate_info<size, big_endian>*,
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unsigned int sh_type,
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const unsigned char* prelocs,
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size_t reloc_count,
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Output_section* output_section,
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off_t offset_in_output_section,
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const Relocatable_relocs*,
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unsigned char*,
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Address view_address,
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section_size_type,
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unsigned char* reloc_view,
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section_size_type reloc_view_size);
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// Return whether SYM is defined by the ABI.
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bool
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do_is_defined_by_abi(const Symbol* sym) const
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{
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return strcmp(sym->name(), "__tls_get_addr") == 0;
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}
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// Return the size of the GOT section.
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section_size_type
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got_size() const
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{
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gold_assert(this->got_ != NULL);
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return this->got_->data_size();
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}
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// Get the PLT section.
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const Output_data_plt_powerpc<size, big_endian>*
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plt_section() const
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{
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gold_assert(this->plt_ != NULL);
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return this->plt_;
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}
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// Get the IPLT section.
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const Output_data_plt_powerpc<size, big_endian>*
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iplt_section() const
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{
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gold_assert(this->iplt_ != NULL);
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return this->iplt_;
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}
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// Get the .glink section.
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const Output_data_glink<size, big_endian>*
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glink_section() const
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{
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gold_assert(this->glink_ != NULL);
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return this->glink_;
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}
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// Get the GOT section.
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const Output_data_got_powerpc<size, big_endian>*
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got_section() const
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{
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gold_assert(this->got_ != NULL);
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return this->got_;
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}
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Object*
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do_make_elf_object(const std::string&, Input_file*, off_t,
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const elfcpp::Ehdr<size, big_endian>&);
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// Return the number of entries in the GOT.
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unsigned int
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got_entry_count() const
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{
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if (this->got_ == NULL)
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return 0;
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return this->got_size() / (size / 8);
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}
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// Return the number of entries in the PLT.
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unsigned int
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plt_entry_count() const;
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// Return the offset of the first non-reserved PLT entry.
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unsigned int
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first_plt_entry_offset() const;
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// Return the size of each PLT entry.
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unsigned int
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plt_entry_size() const;
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// Add any special sections for this symbol to the gc work list.
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// For powerpc64, this adds the code section of a function
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// descriptor.
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void
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do_gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const;
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// Handle target specific gc actions when adding a gc reference from
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// SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX
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// and DST_OFF. For powerpc64, this adds a referenc to the code
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// section of a function descriptor.
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void
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do_gc_add_reference(Symbol_table* symtab,
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Object* src_obj,
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unsigned int src_shndx,
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Object* dst_obj,
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unsigned int dst_shndx,
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Address dst_off) const;
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private:
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// The class which scans relocations.
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class Scan
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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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Scan()
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: issued_non_pic_error_(false)
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{ }
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static inline int
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get_reference_flags(unsigned int r_type);
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inline void
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local(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
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Sized_relobj_file<size, big_endian>* object,
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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>* ,
|
|
unsigned int ,
|
|
Output_section* ,
|
|
const elfcpp::Rela<size, big_endian>& ,
|
|
unsigned int ,
|
|
const elfcpp::Sym<size, big_endian>&)
|
|
{ return false; }
|
|
|
|
inline bool
|
|
global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
|
|
Target_powerpc* ,
|
|
Sized_relobj_file<size, big_endian>* ,
|
|
unsigned int ,
|
|
Output_section* ,
|
|
const elfcpp::Rela<size,
|
|
big_endian>& ,
|
|
unsigned int , Symbol*)
|
|
{ return false; }
|
|
|
|
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);
|
|
|
|
bool
|
|
reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int r_type);
|
|
|
|
// Whether we have issued an error about a non-PIC compilation.
|
|
bool issued_non_pic_error_;
|
|
};
|
|
|
|
Address
|
|
symval_for_branch(Address value, const Sized_symbol<size>* gsym,
|
|
Powerpc_relobj<size, big_endian>* object,
|
|
unsigned int *dest_shndx);
|
|
|
|
// The class which implements relocation.
|
|
class Relocate
|
|
{
|
|
public:
|
|
// Use 'at' branch hints when true, 'y' when false.
|
|
// FIXME maybe: set this with an option.
|
|
static const bool is_isa_v2 = true;
|
|
|
|
enum skip_tls
|
|
{
|
|
CALL_NOT_EXPECTED = 0,
|
|
CALL_EXPECTED = 1,
|
|
CALL_SKIP = 2
|
|
};
|
|
|
|
Relocate()
|
|
: call_tls_get_addr_(CALL_NOT_EXPECTED)
|
|
{ }
|
|
|
|
~Relocate()
|
|
{
|
|
if (this->call_tls_get_addr_ != CALL_NOT_EXPECTED)
|
|
{
|
|
// FIXME: This needs to specify the location somehow.
|
|
gold_error(_("missing expected __tls_get_addr call"));
|
|
}
|
|
}
|
|
|
|
// 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);
|
|
|
|
// This is set if we should skip the next reloc, which should be a
|
|
// call to __tls_get_addr.
|
|
enum skip_tls call_tls_get_addr_;
|
|
};
|
|
|
|
// 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;
|
|
}
|
|
|
|
// Get the GOT section, creating it if necessary.
|
|
Output_data_got_powerpc<size, big_endian>*
|
|
got_section(Symbol_table*, Layout*);
|
|
|
|
// Create glink.
|
|
void
|
|
make_glink_section(Layout*);
|
|
|
|
// Create the PLT section.
|
|
void
|
|
make_plt_section(Layout*);
|
|
|
|
void
|
|
make_iplt_section(Layout*);
|
|
|
|
// Create a PLT entry for a global symbol.
|
|
void
|
|
make_plt_entry(Layout*, Symbol*,
|
|
const elfcpp::Rela<size, big_endian>&,
|
|
const Sized_relobj_file<size, big_endian>* object);
|
|
|
|
// Create a PLT entry for a local IFUNC symbol.
|
|
void
|
|
make_local_ifunc_plt_entry(Layout*,
|
|
const elfcpp::Rela<size, big_endian>&,
|
|
Sized_relobj_file<size, big_endian>*);
|
|
|
|
// 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*);
|
|
|
|
// 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));
|
|
}
|
|
|
|
// 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 output section.
|
|
Output_data_got_powerpc<size, big_endian>* got_;
|
|
// The PLT output section.
|
|
Output_data_plt_powerpc<size, big_endian>* plt_;
|
|
// The IPLT output section.
|
|
Output_data_plt_powerpc<size, big_endian>* iplt_;
|
|
// The .glink output section.
|
|
Output_data_glink<size, big_endian>* glink_;
|
|
// The dynamic reloc output section.
|
|
Reloc_section* rela_dyn_;
|
|
// Relocs saved to avoid a COPY reloc.
|
|
Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
|
|
// Space for variables copied with a COPY reloc.
|
|
Output_data_space* dynbss_;
|
|
// Offset of the GOT entry for local dynamic __tls_get_addr calls.
|
|
unsigned int tlsld_got_offset_;
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
// Modified version of symtab.h class Symbol member
|
|
// Given a direct absolute or pc-relative static relocation against
|
|
// the global symbol, this function returns whether a dynamic relocation
|
|
// is needed.
|
|
|
|
template<int size>
|
|
bool
|
|
needs_dynamic_reloc(const Symbol* gsym, int flags)
|
|
{
|
|
// No dynamic relocations in a static link!
|
|
if (parameters->doing_static_link())
|
|
return false;
|
|
|
|
// A reference to an undefined symbol from an executable should be
|
|
// statically resolved to 0, and does not need a dynamic relocation.
|
|
// This matches gnu ld behavior.
|
|
if (gsym->is_undefined() && !parameters->options().shared())
|
|
return false;
|
|
|
|
// A reference to an absolute symbol does not need a dynamic relocation.
|
|
if (gsym->is_absolute())
|
|
return false;
|
|
|
|
// An absolute reference within a position-independent output file
|
|
// will need a dynamic relocation.
|
|
if ((flags & Symbol::ABSOLUTE_REF)
|
|
&& parameters->options().output_is_position_independent())
|
|
return true;
|
|
|
|
// A function call that can branch to a local PLT entry does not need
|
|
// a dynamic relocation.
|
|
if ((flags & Symbol::FUNCTION_CALL) && gsym->has_plt_offset())
|
|
return false;
|
|
|
|
// A reference to any PLT entry in a non-position-independent executable
|
|
// does not need a dynamic relocation.
|
|
// Except due to having function descriptors on powerpc64 we don't define
|
|
// functions to their plt code in an executable, so this doesn't apply.
|
|
if (size == 32
|
|
&& !parameters->options().output_is_position_independent()
|
|
&& gsym->has_plt_offset())
|
|
return false;
|
|
|
|
// A reference to a symbol defined in a dynamic object or to a
|
|
// symbol that is preemptible will need a dynamic relocation.
|
|
if (gsym->is_from_dynobj()
|
|
|| gsym->is_undefined()
|
|
|| gsym->is_preemptible())
|
|
return true;
|
|
|
|
// For all other cases, return FALSE.
|
|
return false;
|
|
}
|
|
|
|
// Modified version of symtab.h class Symbol member
|
|
// Whether we should use the PLT offset associated with a symbol for
|
|
// a relocation. FLAGS is a set of Reference_flags.
|
|
|
|
template<int size>
|
|
bool
|
|
use_plt_offset(const Symbol* gsym, int flags)
|
|
{
|
|
// If the symbol doesn't have a PLT offset, then naturally we
|
|
// don't want to use it.
|
|
if (!gsym->has_plt_offset())
|
|
return false;
|
|
|
|
// For a STT_GNU_IFUNC symbol we always have to use the PLT entry.
|
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC)
|
|
return true;
|
|
|
|
// If we are going to generate a dynamic relocation, then we will
|
|
// wind up using that, so no need to use the PLT entry.
|
|
if (needs_dynamic_reloc<size>(gsym, flags))
|
|
return false;
|
|
|
|
// If the symbol is from a dynamic object, we need to use the PLT
|
|
// entry.
|
|
if (gsym->is_from_dynobj())
|
|
return true;
|
|
|
|
// If we are generating a shared object, and gsym symbol is
|
|
// undefined or preemptible, we need to use the PLT entry.
|
|
if (parameters->options().shared()
|
|
&& (gsym->is_undefined() || gsym->is_preemptible()))
|
|
return true;
|
|
|
|
// If gsym is a call to a weak undefined symbol, we need to use
|
|
// the PLT entry; the symbol may be defined by a library loaded
|
|
// at runtime.
|
|
if ((flags & Symbol::FUNCTION_CALL) && gsym->is_weak_undefined())
|
|
return true;
|
|
|
|
// Otherwise we can use the regular definition.
|
|
return false;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
class Powerpc_relocate_functions
|
|
{
|
|
public:
|
|
enum Overflow_check
|
|
{
|
|
CHECK_NONE,
|
|
CHECK_SIGNED,
|
|
CHECK_BITFIELD
|
|
};
|
|
|
|
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_bitfield(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 && value + limit > (limit << 1) - 1;
|
|
}
|
|
|
|
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_BITFIELD)
|
|
{
|
|
if (has_overflow_bitfield<valsize>(value))
|
|
return STATUS_OVERFLOW;
|
|
}
|
|
return STATUS_OK;
|
|
}
|
|
|
|
// Do a simple RELA relocation
|
|
template<int valsize>
|
|
static inline Status
|
|
rela(unsigned char* view, Address value, Overflow_check overflow)
|
|
{
|
|
typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
|
|
Valtype* wv = reinterpret_cast<Valtype*>(view);
|
|
elfcpp::Swap<valsize, big_endian>::writeval(wv, value);
|
|
return overflowed<valsize>(value, overflow);
|
|
}
|
|
|
|
template<int valsize>
|
|
static inline Status
|
|
rela(unsigned char* view,
|
|
unsigned int right_shift,
|
|
typename elfcpp::Valtype_base<valsize>::Valtype dst_mask,
|
|
Address value,
|
|
Overflow_check overflow)
|
|
{
|
|
typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
|
|
Valtype* wv = reinterpret_cast<Valtype*>(view);
|
|
Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
|
|
Valtype reloc = value >> right_shift;
|
|
val &= ~dst_mask;
|
|
reloc &= dst_mask;
|
|
elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
|
|
return overflowed<valsize>(value >> right_shift, overflow);
|
|
}
|
|
|
|
// Do a simple RELA relocation, unaligned.
|
|
template<int valsize>
|
|
static inline Status
|
|
rela_ua(unsigned char* view, Address value, Overflow_check overflow)
|
|
{
|
|
elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, value);
|
|
return overflowed<valsize>(value, overflow);
|
|
}
|
|
|
|
template<int valsize>
|
|
static inline Status
|
|
rela_ua(unsigned char* view,
|
|
unsigned int right_shift,
|
|
typename elfcpp::Valtype_base<valsize>::Valtype dst_mask,
|
|
Address value,
|
|
Overflow_check overflow)
|
|
{
|
|
typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
|
|
Valtype;
|
|
Valtype val = elfcpp::Swap<valsize, big_endian>::readval(view);
|
|
Valtype reloc = value >> right_shift;
|
|
val &= ~dst_mask;
|
|
reloc &= dst_mask;
|
|
elfcpp::Swap_unaligned<valsize, 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>(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>(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>(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>(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>(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>(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>(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>(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>(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>(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>(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>(view, 0, 0xfffc, value, overflow);
|
|
if (overflow != CHECK_NONE && (value & 3) != 0)
|
|
stat = STATUS_OVERFLOW;
|
|
return stat;
|
|
}
|
|
};
|
|
|
|
// 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->find_shdr(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;
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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)
|
|
{
|
|
Sized_dynobj<size, big_endian>* obj =
|
|
new Sized_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)
|
|
{}
|
|
|
|
class Got_entry;
|
|
|
|
// Create a new GOT entry and return its offset.
|
|
unsigned int
|
|
add_got_entry(Got_entry got_entry)
|
|
{
|
|
this->reserve_ent();
|
|
return Output_data_got<size, big_endian>::add_got_entry(got_entry);
|
|
}
|
|
|
|
// Create a pair of new GOT entries and return the offset of the first.
|
|
unsigned int
|
|
add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2)
|
|
{
|
|
this->reserve_ent(2);
|
|
return Output_data_got<size, big_endian>::add_got_entry_pair(got_entry_1,
|
|
got_entry_2);
|
|
}
|
|
|
|
unsigned int
|
|
add_constant_pair(Valtype c1, Valtype c2)
|
|
{
|
|
this->reserve_ent(2);
|
|
unsigned int got_offset = this->add_constant(c1);
|
|
this->add_constant(c2);
|
|
return got_offset;
|
|
}
|
|
|
|
// 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.
|
|
typename elfcpp::Elf_types<size>::Elf_Off
|
|
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
|
|
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_;
|
|
}
|
|
|
|
// 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,
|
|
unsigned int reserved_size,
|
|
const char* name)
|
|
: Output_section_data_build(size == 32 ? 4 : 8),
|
|
rel_(plt_rel),
|
|
targ_(targ),
|
|
initial_plt_entry_size_(reserved_size),
|
|
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
|
|
{
|
|
return ((this->current_data_size() - this->initial_plt_entry_size_)
|
|
/ plt_entry_size);
|
|
}
|
|
|
|
// Return the offset of the first non-reserved PLT entry.
|
|
unsigned int
|
|
first_plt_entry_offset()
|
|
{ return this->initial_plt_entry_size_; }
|
|
|
|
// Return the size of a PLT entry.
|
|
static unsigned int
|
|
get_plt_entry_size()
|
|
{ return 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:
|
|
// The size of an entry in the PLT.
|
|
static const int plt_entry_size = size == 32 ? 4 : 24;
|
|
|
|
// 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_;
|
|
// The size of the first reserved entry.
|
|
int initial_plt_entry_size_;
|
|
// 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())
|
|
{
|
|
off_t 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 += 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())
|
|
{
|
|
off_t off = this->current_data_size();
|
|
gsym->set_plt_offset(off);
|
|
unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE;
|
|
if (size == 64)
|
|
dynrel = elfcpp::R_PPC64_JMP_IREL;
|
|
this->rel_->add_symbolless_global_addend(gsym, dynrel, this, off, 0);
|
|
off += 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))
|
|
{
|
|
off_t off = this->current_data_size();
|
|
relobj->set_local_plt_offset(local_sym_index, off);
|
|
unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE;
|
|
if (size == 64)
|
|
dynrel = elfcpp::R_PPC64_JMP_IREL;
|
|
this->rel_->add_symbolless_local_addend(relobj, local_sym_index, dynrel,
|
|
this, off, 0);
|
|
off += plt_entry_size;
|
|
this->set_current_data_size(off);
|
|
}
|
|
}
|
|
|
|
static const uint32_t add_0_11_11 = 0x7c0b5a14;
|
|
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_12_2_11 = 0x7d825a14;
|
|
static const uint32_t addi_11_11 = 0x396b0000;
|
|
static const uint32_t addi_12_12 = 0x398c0000;
|
|
static const uint32_t addi_2_2 = 0x38420000;
|
|
static const uint32_t addi_3_2 = 0x38620000;
|
|
static const uint32_t addi_3_3 = 0x38630000;
|
|
static const uint32_t addis_0_2 = 0x3c020000;
|
|
static const uint32_t addis_0_13 = 0x3c0d0000;
|
|
static const uint32_t addis_11_11 = 0x3d6b0000;
|
|
static const uint32_t addis_11_30 = 0x3d7e0000;
|
|
static const uint32_t addis_12_12 = 0x3d8c0000;
|
|
static const uint32_t addis_12_2 = 0x3d820000;
|
|
static const uint32_t addis_3_2 = 0x3c620000;
|
|
static const uint32_t addis_3_13 = 0x3c6d0000;
|
|
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 blrl = 0x4e800021;
|
|
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_11_12 = 0xe96c0000;
|
|
static const uint32_t ld_11_2 = 0xe9620000;
|
|
static const uint32_t ld_2_1 = 0xe8410000;
|
|
static const uint32_t ld_2_11 = 0xe84b0000;
|
|
static const uint32_t ld_2_12 = 0xe84c0000;
|
|
static const uint32_t ld_2_2 = 0xe8420000;
|
|
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 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 lvx_0_12_0 = 0x7c0c00ce;
|
|
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 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 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;
|
|
|
|
// 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)
|
|
{
|
|
const off_t 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() + glink->pltresolve();
|
|
|
|
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(Layout* layout)
|
|
{
|
|
if (this->plt_ == NULL)
|
|
{
|
|
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 it's 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,
|
|
size == 32 ? 0 : 24,
|
|
"** 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(Layout* layout)
|
|
{
|
|
if (this->iplt_ == NULL)
|
|
{
|
|
this->make_plt_section(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,
|
|
0, "** IPLT");
|
|
this->plt_->output_section()->add_output_section_data(this->iplt_);
|
|
}
|
|
}
|
|
|
|
// A class to handle .glink.
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_glink : public Output_section_data
|
|
{
|
|
public:
|
|
static const int pltresolve_size = 16*4;
|
|
|
|
Output_data_glink(Target_powerpc<size, big_endian>*);
|
|
|
|
// Add an entry
|
|
void
|
|
add_entry(const Sized_relobj_file<size, big_endian>*,
|
|
const Symbol*,
|
|
const elfcpp::Rela<size, big_endian>&);
|
|
|
|
void
|
|
add_entry(const Sized_relobj_file<size, big_endian>*,
|
|
unsigned int,
|
|
const elfcpp::Rela<size, big_endian>&);
|
|
|
|
unsigned int
|
|
find_entry(const Symbol*) const;
|
|
|
|
unsigned int
|
|
find_entry(const Sized_relobj_file<size, big_endian>*, unsigned int) const;
|
|
|
|
unsigned int
|
|
find_entry(const Sized_relobj_file<size, big_endian>*,
|
|
const Symbol*,
|
|
const elfcpp::Rela<size, big_endian>&) const;
|
|
|
|
unsigned int
|
|
find_entry(const Sized_relobj_file<size, big_endian>*,
|
|
unsigned int,
|
|
const elfcpp::Rela<size, big_endian>&) const;
|
|
|
|
unsigned int
|
|
glink_entry_size() const
|
|
{
|
|
if (size == 32)
|
|
return 4 * 4;
|
|
else
|
|
// FIXME: We should be using multiple glink sections for
|
|
// stubs to support > 33M applications.
|
|
return 8 * 4;
|
|
}
|
|
|
|
off_t
|
|
pltresolve() const
|
|
{
|
|
return this->pltresolve_;
|
|
}
|
|
|
|
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*);
|
|
|
|
class Glink_sym_ent
|
|
{
|
|
public:
|
|
Glink_sym_ent(const Symbol* sym)
|
|
: sym_(sym), object_(0), addend_(0), locsym_(0)
|
|
{ }
|
|
|
|
Glink_sym_ent(const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index)
|
|
: sym_(NULL), object_(object), addend_(0), locsym_(locsym_index)
|
|
{ }
|
|
|
|
Glink_sym_ent(const Sized_relobj_file<size, big_endian>* object,
|
|
const Symbol* sym,
|
|
const elfcpp::Rela<size, big_endian>& reloc)
|
|
: sym_(sym), object_(0), addend_(0), locsym_(0)
|
|
{
|
|
if (size != 32)
|
|
this->addend_ = reloc.get_r_addend();
|
|
else if (parameters->options().output_is_position_independent()
|
|
&& (elfcpp::elf_r_type<size>(reloc.get_r_info())
|
|
== elfcpp::R_PPC_PLTREL24))
|
|
{
|
|
this->addend_ = reloc.get_r_addend();
|
|
if (this->addend_ >= 32768)
|
|
this->object_ = object;
|
|
}
|
|
}
|
|
|
|
Glink_sym_ent(const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index,
|
|
const elfcpp::Rela<size, big_endian>& reloc)
|
|
: sym_(NULL), object_(object), addend_(0), locsym_(locsym_index)
|
|
{
|
|
if (size != 32)
|
|
this->addend_ = reloc.get_r_addend();
|
|
else if (parameters->options().output_is_position_independent()
|
|
&& (elfcpp::elf_r_type<size>(reloc.get_r_info())
|
|
== elfcpp::R_PPC_PLTREL24))
|
|
this->addend_ = reloc.get_r_addend();
|
|
}
|
|
|
|
bool operator==(const Glink_sym_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 Glink_sym_ent_hash
|
|
{
|
|
public:
|
|
size_t operator()(const Glink_sym_ent& ent) const
|
|
{
|
|
return (reinterpret_cast<uintptr_t>(ent.sym_)
|
|
^ reinterpret_cast<uintptr_t>(ent.object_)
|
|
^ ent.addend_
|
|
^ ent.locsym_);
|
|
}
|
|
};
|
|
|
|
// Map sym/object/addend to index.
|
|
typedef Unordered_map<Glink_sym_ent, unsigned int,
|
|
Glink_sym_ent_hash> Glink_entries;
|
|
Glink_entries glink_entries_;
|
|
|
|
// Offset of pltresolve stub (actually, branch table for 32-bit)
|
|
off_t pltresolve_;
|
|
|
|
// Allows access to .got and .plt for do_write.
|
|
Target_powerpc<size, big_endian>* targ_;
|
|
};
|
|
|
|
// Create the glink section.
|
|
|
|
template<int size, bool big_endian>
|
|
Output_data_glink<size, big_endian>::Output_data_glink(
|
|
Target_powerpc<size, big_endian>* targ)
|
|
: Output_section_data(16),
|
|
pltresolve_(0), targ_(targ)
|
|
{
|
|
}
|
|
|
|
// Add an entry to glink, if we do not already have one for this
|
|
// sym/object/addend combo.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_glink<size, big_endian>::add_entry(
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
const Symbol* gsym,
|
|
const elfcpp::Rela<size, big_endian>& reloc)
|
|
{
|
|
Glink_sym_ent ent(object, gsym, reloc);
|
|
unsigned int indx = this->glink_entries_.size();
|
|
this->glink_entries_.insert(std::make_pair(ent, indx));
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_glink<size, big_endian>::add_entry(
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index,
|
|
const elfcpp::Rela<size, big_endian>& reloc)
|
|
{
|
|
Glink_sym_ent ent(object, locsym_index, reloc);
|
|
unsigned int indx = this->glink_entries_.size();
|
|
this->glink_entries_.insert(std::make_pair(ent, indx));
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Output_data_glink<size, big_endian>::find_entry(
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
const Symbol* gsym,
|
|
const elfcpp::Rela<size, big_endian>& reloc) const
|
|
{
|
|
Glink_sym_ent ent(object, gsym, reloc);
|
|
typename Glink_entries::const_iterator p = this->glink_entries_.find(ent);
|
|
gold_assert(p != this->glink_entries_.end());
|
|
return p->second;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Output_data_glink<size, big_endian>::find_entry(const Symbol* gsym) const
|
|
{
|
|
Glink_sym_ent ent(gsym);
|
|
typename Glink_entries::const_iterator p = this->glink_entries_.find(ent);
|
|
gold_assert(p != this->glink_entries_.end());
|
|
return p->second;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Output_data_glink<size, big_endian>::find_entry(
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index,
|
|
const elfcpp::Rela<size, big_endian>& reloc) const
|
|
{
|
|
Glink_sym_ent ent(object, locsym_index, reloc);
|
|
typename Glink_entries::const_iterator p = this->glink_entries_.find(ent);
|
|
gold_assert(p != this->glink_entries_.end());
|
|
return p->second;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Output_data_glink<size, big_endian>::find_entry(
|
|
const Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int locsym_index) const
|
|
{
|
|
Glink_sym_ent ent(object, locsym_index);
|
|
typename Glink_entries::const_iterator p = this->glink_entries_.find(ent);
|
|
gold_assert(p != this->glink_entries_.end());
|
|
return p->second;
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_glink<size, big_endian>::set_final_data_size()
|
|
{
|
|
unsigned int count = this->glink_entries_.size();
|
|
off_t total = count;
|
|
|
|
if (count != 0)
|
|
{
|
|
if (size == 32)
|
|
{
|
|
total *= 16;
|
|
this->pltresolve_ = total;
|
|
|
|
// space for branch table
|
|
total += 4 * (count - 1);
|
|
|
|
total += -total & 15;
|
|
total += this->pltresolve_size;
|
|
}
|
|
else
|
|
{
|
|
total *= 32;
|
|
this->pltresolve_ = total;
|
|
total += this->pltresolve_size;
|
|
|
|
// space for branch table
|
|
total += 8 * count;
|
|
if (count > 0x8000)
|
|
total += 4 * (count - 0x8000);
|
|
}
|
|
}
|
|
|
|
this->set_data_size(total);
|
|
}
|
|
|
|
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<bool big_endian>
|
|
static inline void
|
|
write_insn(unsigned char* p, uint32_t v)
|
|
{
|
|
elfcpp::Swap<32, big_endian>::writeval(p, v);
|
|
}
|
|
|
|
// Write out .glink.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Output_data_glink<size, big_endian>::do_write(Output_file* of)
|
|
{
|
|
const off_t 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;
|
|
static const Address invalid_address = static_cast<Address>(0) - 1;
|
|
Address plt_base = this->targ_->plt_section()->address();
|
|
Address iplt_base = invalid_address;
|
|
|
|
const Output_data_got_powerpc<size, big_endian>* got
|
|
= this->targ_->got_section();
|
|
|
|
if (size == 64)
|
|
{
|
|
Address got_os_addr = got->output_section()->address();
|
|
|
|
// Write out call stubs.
|
|
typename Glink_entries::const_iterator g;
|
|
for (g = this->glink_entries_.begin();
|
|
g != this->glink_entries_.end();
|
|
++g)
|
|
{
|
|
Address plt_addr;
|
|
bool is_ifunc;
|
|
const Symbol* gsym = g->first.sym_;
|
|
if (gsym != NULL)
|
|
{
|
|
is_ifunc = (gsym->type() == elfcpp::STT_GNU_IFUNC
|
|
&& gsym->can_use_relative_reloc(false));
|
|
plt_addr = gsym->plt_offset();
|
|
}
|
|
else
|
|
{
|
|
is_ifunc = true;
|
|
const Sized_relobj_file<size, big_endian>* relobj
|
|
= g->first.object_;
|
|
unsigned int local_sym_index = g->first.locsym_;
|
|
plt_addr = relobj->local_plt_offset(local_sym_index);
|
|
}
|
|
if (is_ifunc)
|
|
{
|
|
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>*>(g->first.object_);
|
|
Address got_addr = got_os_addr + ppcobj->toc_base_offset();
|
|
Address pltoff = plt_addr - got_addr;
|
|
|
|
if (pltoff + 0x80008000 > 0xffffffff || (pltoff & 7) != 0)
|
|
gold_error(_("%s: linkage table error against `%s'"),
|
|
g->first.object_->name().c_str(),
|
|
g->first.sym_->demangled_name().c_str());
|
|
|
|
p = oview + g->second * this->glink_entry_size();
|
|
if (ha(pltoff) != 0)
|
|
{
|
|
write_insn<big_endian>(p, addis_12_2 + ha(pltoff)), p += 4;
|
|
write_insn<big_endian>(p, std_2_1 + 40), p += 4;
|
|
write_insn<big_endian>(p, ld_11_12 + l(pltoff)), p += 4;
|
|
if (ha(pltoff + 16) != ha(pltoff))
|
|
{
|
|
write_insn<big_endian>(p, addi_12_12 + l(pltoff)), p += 4;
|
|
pltoff = 0;
|
|
}
|
|
write_insn<big_endian>(p, mtctr_11), p += 4;
|
|
write_insn<big_endian>(p, ld_2_12 + l(pltoff + 8)), p += 4;
|
|
write_insn<big_endian>(p, ld_11_12 + l(pltoff + 16)), p += 4;
|
|
write_insn<big_endian>(p, bctr), p += 4;
|
|
}
|
|
else
|
|
{
|
|
write_insn<big_endian>(p, std_2_1 + 40), p += 4;
|
|
write_insn<big_endian>(p, ld_11_2 + l(pltoff)), p += 4;
|
|
if (ha(pltoff + 16) != ha(pltoff))
|
|
{
|
|
write_insn<big_endian>(p, addi_2_2 + l(pltoff)), p += 4;
|
|
pltoff = 0;
|
|
}
|
|
write_insn<big_endian>(p, mtctr_11), p += 4;
|
|
write_insn<big_endian>(p, ld_11_2 + l(pltoff + 16)), p += 4;
|
|
write_insn<big_endian>(p, ld_2_2 + l(pltoff + 8)), p += 4;
|
|
write_insn<big_endian>(p, bctr), p += 4;
|
|
}
|
|
}
|
|
|
|
// Write pltresolve stub.
|
|
p = oview + this->pltresolve_;
|
|
Address after_bcl = this->address() + this->pltresolve_ + 16;
|
|
Address pltoff = plt_base - after_bcl;
|
|
|
|
elfcpp::Swap<64, big_endian>::writeval(p, pltoff), p += 8;
|
|
|
|
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_12_2_11), p += 4;
|
|
write_insn<big_endian>(p, ld_11_12 + 0), p += 4;
|
|
write_insn<big_endian>(p, ld_2_12 + 8), p += 4;
|
|
write_insn<big_endian>(p, mtctr_11), p += 4;
|
|
write_insn<big_endian>(p, ld_11_12 + 16), p += 4;
|
|
write_insn<big_endian>(p, bctr), p += 4;
|
|
while (p < oview + this->pltresolve_ + this->pltresolve_size)
|
|
write_insn<big_endian>(p, nop), p += 4;
|
|
|
|
// Write lazy link call stubs.
|
|
uint32_t indx = 0;
|
|
while (p < oview + oview_size)
|
|
{
|
|
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 = this->pltresolve_ + 8 - (p - oview);
|
|
write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4;
|
|
indx++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// The address of _GLOBAL_OFFSET_TABLE_.
|
|
Address g_o_t = got->address() + got->g_o_t();
|
|
|
|
// Write out call stubs.
|
|
typename Glink_entries::const_iterator g;
|
|
for (g = this->glink_entries_.begin();
|
|
g != this->glink_entries_.end();
|
|
++g)
|
|
{
|
|
Address plt_addr;
|
|
bool is_ifunc;
|
|
const Symbol* gsym = g->first.sym_;
|
|
if (gsym != NULL)
|
|
{
|
|
is_ifunc = (gsym->type() == elfcpp::STT_GNU_IFUNC
|
|
&& gsym->can_use_relative_reloc(false));
|
|
plt_addr = gsym->plt_offset();
|
|
}
|
|
else
|
|
{
|
|
is_ifunc = true;
|
|
const Sized_relobj_file<size, big_endian>* relobj
|
|
= g->first.object_;
|
|
unsigned int local_sym_index = g->first.locsym_;
|
|
plt_addr = relobj->local_plt_offset(local_sym_index);
|
|
}
|
|
if (is_ifunc)
|
|
{
|
|
if (iplt_base == invalid_address)
|
|
iplt_base = this->targ_->iplt_section()->address();
|
|
plt_addr += iplt_base;
|
|
}
|
|
else
|
|
plt_addr += plt_base;
|
|
|
|
p = oview + g->second * this->glink_entry_size();
|
|
if (parameters->options().output_is_position_independent())
|
|
{
|
|
Address got_addr;
|
|
const Powerpc_relobj<size, big_endian>* object = static_cast
|
|
<const Powerpc_relobj<size, big_endian>*>(g->first.object_);
|
|
if (object != NULL && g->first.addend_ >= 32768)
|
|
{
|
|
unsigned int got2 = object->got2_shndx();
|
|
got_addr = g->first.object_->get_output_section_offset(got2);
|
|
gold_assert(got_addr != invalid_address);
|
|
got_addr += (g->first.object_->output_section(got2)->address()
|
|
+ g->first.addend_);
|
|
}
|
|
else
|
|
got_addr = g_o_t;
|
|
|
|
Address pltoff = plt_addr - got_addr;
|
|
if (ha(pltoff) == 0)
|
|
{
|
|
write_insn<big_endian>(p + 0, lwz_11_30 + l(pltoff));
|
|
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(pltoff));
|
|
write_insn<big_endian>(p + 4, lwz_11_11 + l(pltoff));
|
|
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 pltresolve branch table.
|
|
p = oview + this->pltresolve_;
|
|
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 = this->pltresolve_;
|
|
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->pltresolve_ + 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];
|
|
|
|
off_t 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);
|
|
off_t 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 off_t 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);
|
|
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(
|
|
Layout* layout,
|
|
Symbol* gsym,
|
|
const elfcpp::Rela<size, big_endian>& reloc,
|
|
const Sized_relobj_file<size, big_endian>* object)
|
|
{
|
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC
|
|
&& gsym->can_use_relative_reloc(false))
|
|
{
|
|
if (this->iplt_ == NULL)
|
|
this->make_iplt_section(layout);
|
|
this->iplt_->add_ifunc_entry(gsym);
|
|
}
|
|
else
|
|
{
|
|
if (this->plt_ == NULL)
|
|
this->make_plt_section(layout);
|
|
this->plt_->add_entry(gsym);
|
|
}
|
|
this->glink_->add_entry(object, gsym, reloc);
|
|
}
|
|
|
|
// 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(
|
|
Layout* layout,
|
|
const elfcpp::Rela<size, big_endian>& reloc,
|
|
Sized_relobj_file<size, big_endian>* relobj)
|
|
{
|
|
if (this->iplt_ == NULL)
|
|
this->make_iplt_section(layout);
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
|
|
this->iplt_->add_local_ifunc_entry(relobj, r_sym);
|
|
this->glink_->add_entry(relobj, r_sym, reloc);
|
|
}
|
|
|
|
// 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;
|
|
unsigned int count = this->plt_->entry_count();
|
|
if (this->iplt_ != NULL)
|
|
count += this->iplt_->entry_count();
|
|
return count;
|
|
}
|
|
|
|
// Return the offset of the first non-reserved PLT entry.
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Target_powerpc<size, big_endian>::first_plt_entry_offset() const
|
|
{
|
|
return this->plt_->first_plt_entry_offset();
|
|
}
|
|
|
|
// Return the size of each PLT entry.
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Target_powerpc<size, big_endian>::plt_entry_size() const
|
|
{
|
|
return Output_data_plt_powerpc<size, big_endian>::get_plt_entry_size();
|
|
}
|
|
|
|
// 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)
|
|
{
|
|
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.
|
|
return 0;
|
|
|
|
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:
|
|
return Symbol::ABSOLUTE_REF;
|
|
|
|
case elfcpp::R_POWERPC_ADDR24:
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
return Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF;
|
|
|
|
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:
|
|
return Symbol::RELATIVE_REF;
|
|
|
|
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 Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
|
|
|
|
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.
|
|
return Symbol::ABSOLUTE_REF;
|
|
|
|
case elfcpp::R_POWERPC_GOT_TPREL16:
|
|
case elfcpp::R_POWERPC_TLS:
|
|
return Symbol::TLS_REF;
|
|
|
|
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.
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// 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_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_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(
|
|
Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int r_type)
|
|
{
|
|
// In non-pic code any reference will resolve to the plt call stub
|
|
// for the ifunc symbol.
|
|
if (size == 32 && !parameters->options().output_is_position_independent())
|
|
return true;
|
|
|
|
switch (r_type)
|
|
{
|
|
// Word size refs from data sections are OK.
|
|
case elfcpp::R_POWERPC_ADDR32:
|
|
case elfcpp::R_POWERPC_UADDR32:
|
|
if (size == 32)
|
|
return true;
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR64:
|
|
case elfcpp::R_PPC64_UADDR64:
|
|
if (size == 64)
|
|
return true;
|
|
break;
|
|
|
|
// GOT refs are good.
|
|
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 true;
|
|
|
|
// So are function calls.
|
|
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.
|
|
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)
|
|
{
|
|
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(object, r_type))
|
|
target->make_local_ifunc_plt_entry(layout, reloc, object);
|
|
|
|
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_PPC_EMB_MRKREF:
|
|
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;
|
|
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_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))
|
|
{
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
|
|
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 = elfcpp::R_POWERPC_RELATIVE;
|
|
if (is_ifunc)
|
|
{
|
|
rela_dyn = target->iplt_section()->rel_plt();
|
|
dynrel = elfcpp::R_POWERPC_IRELATIVE;
|
|
}
|
|
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_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:
|
|
case elfcpp::R_POWERPC_SECTOFF:
|
|
case elfcpp::R_POWERPC_TPREL16:
|
|
case elfcpp::R_POWERPC_DTPREL16:
|
|
case elfcpp::R_POWERPC_SECTOFF_LO:
|
|
case elfcpp::R_POWERPC_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_SECTOFF_HI:
|
|
case elfcpp::R_POWERPC_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_SECTOFF_HA:
|
|
case elfcpp::R_POWERPC_TPREL16_HA:
|
|
case elfcpp::R_POWERPC_DTPREL16_HA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHESTA:
|
|
case elfcpp::R_PPC64_TPREL16_DS:
|
|
case elfcpp::R_PPC64_TPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_LO_DS:
|
|
case elfcpp::R_PPC64_TLSGD:
|
|
case elfcpp::R_PPC64_TLSLD:
|
|
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)
|
|
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(layout);
|
|
unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE;
|
|
if (is_ifunc)
|
|
{
|
|
rela_dyn = target->iplt_section()->rel_plt();
|
|
dynrel = elfcpp::R_POWERPC_IRELATIVE;
|
|
}
|
|
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)
|
|
{
|
|
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_TPREL);
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
|
|
// 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)
|
|
{
|
|
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.
|
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC
|
|
&& this->reloc_needs_plt_for_ifunc(object, r_type))
|
|
target->make_plt_entry(layout, gsym, reloc, object);
|
|
|
|
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_PPC_EMB_MRKREF:
|
|
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
|
|
&& 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_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())
|
|
{
|
|
target->make_plt_entry(layout, gsym, reloc, 0);
|
|
// 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.
|
|
if (size == 32
|
|
&& gsym->is_from_dynobj()
|
|
&& !parameters->options().output_is_position_independent())
|
|
gsym->set_needs_dynsym_value();
|
|
}
|
|
// Make a dynamic relocation if necessary.
|
|
if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type))
|
|
|| (size == 64 && gsym->type() == elfcpp::STT_GNU_IFUNC))
|
|
{
|
|
if (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))
|
|
&& (gsym->can_use_relative_reloc(false)
|
|
|| (size == 64
|
|
&& data_shndx == ppc_object->opd_shndx())))
|
|
{
|
|
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|
|
unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE;
|
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC)
|
|
{
|
|
rela_dyn = target->iplt_section()->rel_plt();
|
|
dynrel = elfcpp::R_POWERPC_IRELATIVE;
|
|
}
|
|
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(layout);
|
|
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 (gsym->needs_plt_entry()
|
|
|| (!gsym->final_value_is_known()
|
|
&& (gsym->is_undefined()
|
|
|| gsym->is_from_dynobj()
|
|
|| gsym->is_preemptible())))
|
|
target->make_plt_entry(layout, gsym, reloc, object);
|
|
// Fall thru
|
|
|
|
case elfcpp::R_PPC64_REL64:
|
|
case elfcpp::R_POWERPC_REL32:
|
|
// Make a dynamic relocation if necessary.
|
|
if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type)))
|
|
{
|
|
if (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(layout);
|
|
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_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:
|
|
case elfcpp::R_POWERPC_SECTOFF:
|
|
case elfcpp::R_POWERPC_TPREL16:
|
|
case elfcpp::R_POWERPC_DTPREL16:
|
|
case elfcpp::R_POWERPC_SECTOFF_LO:
|
|
case elfcpp::R_POWERPC_TPREL16_LO:
|
|
case elfcpp::R_POWERPC_DTPREL16_LO:
|
|
case elfcpp::R_POWERPC_SECTOFF_HI:
|
|
case elfcpp::R_POWERPC_TPREL16_HI:
|
|
case elfcpp::R_POWERPC_DTPREL16_HI:
|
|
case elfcpp::R_POWERPC_SECTOFF_HA:
|
|
case elfcpp::R_POWERPC_TPREL16_HA:
|
|
case elfcpp::R_POWERPC_DTPREL16_HA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHER:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHERA:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHEST:
|
|
case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
|
|
case elfcpp::R_PPC64_TPREL16_HIGHESTA:
|
|
case elfcpp::R_PPC64_TPREL16_DS:
|
|
case elfcpp::R_PPC64_TPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_DS:
|
|
case elfcpp::R_PPC64_DTPREL16_LO_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_DS:
|
|
case elfcpp::R_PPC64_SECTOFF_LO_DS:
|
|
case elfcpp::R_PPC64_TLSGD:
|
|
case elfcpp::R_PPC64_TLSLD:
|
|
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 && gsym->type() == elfcpp::STT_GNU_IFUNC)
|
|
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(layout);
|
|
if (gsym->can_use_relative_reloc(false)
|
|
&& !(size == 32
|
|
&& gsym->visibility() == elfcpp::STV_PROTECTED
|
|
&& parameters->options().shared()))
|
|
{
|
|
unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE;
|
|
if (gsym->type() == elfcpp::STT_GNU_IFUNC)
|
|
{
|
|
rela_dyn = target->iplt_section()->rel_plt();
|
|
dynrel = elfcpp::R_POWERPC_IRELATIVE;
|
|
}
|
|
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);
|
|
got->add_global_pair_with_rel(gsym, GOT_TYPE_TLSGD,
|
|
target->rela_dyn_section(layout),
|
|
elfcpp::R_POWERPC_DTPMOD,
|
|
elfcpp::R_POWERPC_DTPREL);
|
|
}
|
|
else if (tls_type == tls::TLSOPT_TO_IE)
|
|
{
|
|
Output_data_got_powerpc<size, big_endian>* got
|
|
= target->got_section(symtab, layout);
|
|
got->add_global_with_rel(gsym, GOT_TYPE_TPREL,
|
|
target->rela_dyn_section(layout),
|
|
elfcpp::R_POWERPC_TPREL);
|
|
}
|
|
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)
|
|
{
|
|
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_TPREL,
|
|
target->rela_dyn_section(layout),
|
|
elfcpp::R_POWERPC_TPREL);
|
|
else
|
|
got->add_global_tls(gsym, GOT_TYPE_TPREL);
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
|
|
// 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
|
|
{
|
|
Powerpc_relobj<size, big_endian>* ppc_object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(dst_obj);
|
|
if (size == 64 && 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 == 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);
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
|
|
if (size == 32)
|
|
{
|
|
static Output_data_space* sdata;
|
|
|
|
// Define _SDA_BASE_ at the start of the .sdata section.
|
|
if (sdata == NULL)
|
|
{
|
|
// layout->find_output_section(".sdata") == NULL
|
|
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);
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
Powerpc_relobj<64, big_endian>* symobj
|
|
= static_cast<Powerpc_relobj<64, big_endian>*>(sym->object());
|
|
if (symobj->is_dynamic()
|
|
|| 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);
|
|
}
|
|
}
|
|
|
|
// 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());
|
|
this->define_save_restore_funcs(layout, symtab);
|
|
}
|
|
|
|
// 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()
|
|
+ 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 the value to use for a branch relocation.
|
|
|
|
template<int size, bool big_endian>
|
|
typename elfcpp::Elf_types<size>::Elf_Addr
|
|
Target_powerpc<size, big_endian>::symval_for_branch(
|
|
Address value,
|
|
const Sized_symbol<size>* gsym,
|
|
Powerpc_relobj<size, big_endian>* object,
|
|
unsigned int *dest_shndx)
|
|
{
|
|
*dest_shndx = 0;
|
|
if (size == 32)
|
|
return value;
|
|
|
|
// 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);
|
|
gold_assert(opd_addr != invalid_address);
|
|
opd_addr += symobj->output_section(shndx)->address();
|
|
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);
|
|
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)
|
|
{
|
|
|
|
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);
|
|
enum skip_tls last_tls = this->call_tls_get_addr_;
|
|
this->call_tls_get_addr_ = CALL_NOT_EXPECTED;
|
|
if (is_tls_call)
|
|
{
|
|
if (last_tls == CALL_NOT_EXPECTED)
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("__tls_get_addr call lacks marker reloc"));
|
|
else if (last_tls == CALL_SKIP)
|
|
return false;
|
|
}
|
|
else if (last_tls != CALL_NOT_EXPECTED)
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("missing expected __tls_get_addr call"));
|
|
|
|
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_plt_value = false;
|
|
unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
|
|
if (gsym != NULL
|
|
? use_plt_offset<size>(gsym, Scan::get_reference_flags(r_type))
|
|
: object->local_has_plt_offset(r_sym))
|
|
{
|
|
const Output_data_glink<size, big_endian>* glink
|
|
= target->glink_section();
|
|
unsigned int glink_index;
|
|
if (gsym != NULL)
|
|
glink_index = glink->find_entry(object, gsym, rela);
|
|
else
|
|
glink_index = glink->find_entry(object, r_sym, rela);
|
|
value = glink->address() + glink_index * glink->glink_entry_size();
|
|
has_plt_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_plt_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 + 40);
|
|
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)
|
|
{
|
|
// This is not an error in one special case: A self
|
|
// call. It isn't possible to cheaply verify we have
|
|
// such a call so just check for a call to the same
|
|
// section.
|
|
bool ok = false;
|
|
Address code = value;
|
|
if (gsym->source() == Symbol::FROM_OBJECT
|
|
&& gsym->object() == object)
|
|
{
|
|
Address addend = rela.get_r_addend();
|
|
unsigned int dest_shndx;
|
|
Address opdent = psymval->value(object, addend);
|
|
code = target->symval_for_branch(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->call_tls_get_addr_ = CALL_EXPECTED;
|
|
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->call_tls_get_addr_ = CALL_SKIP;
|
|
}
|
|
}
|
|
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->call_tls_get_addr_ = CALL_EXPECTED;
|
|
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->call_tls_get_addr_ = CALL_SKIP;
|
|
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_plt_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))
|
|
value = target->symval_for_branch(value, gsym, object, &dest_shndx);
|
|
}
|
|
|
|
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:
|
|
if (size != 64)
|
|
// R_PPC_TLSGD and R_PPC_TLSLD
|
|
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:
|
|
// tls symbol values are relative to tls_segment()->vaddr()
|
|
value -= dtp_offset;
|
|
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;
|
|
}
|
|
|
|
typename Reloc::Overflow_check overflow = Reloc::CHECK_NONE;
|
|
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_ADDR24:
|
|
case elfcpp::R_POWERPC_ADDR16:
|
|
case elfcpp::R_POWERPC_UADDR16:
|
|
case elfcpp::R_PPC64_ADDR16_DS:
|
|
case elfcpp::R_POWERPC_ADDR14:
|
|
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
|
|
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
|
|
overflow = Reloc::CHECK_BITFIELD;
|
|
break;
|
|
|
|
case elfcpp::R_POWERPC_REL24:
|
|
case elfcpp::R_PPC_PLTREL24:
|
|
case elfcpp::R_PPC_LOCAL24PC:
|
|
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_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:
|
|
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_SIGNED;
|
|
break;
|
|
}
|
|
|
|
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:
|
|
case elfcpp::R_PPC_EMB_MRKREF:
|
|
break;
|
|
|
|
case elfcpp::R_PPC64_ADDR64:
|
|
case elfcpp::R_PPC64_REL64:
|
|
case elfcpp::R_PPC64_TOC:
|
|
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:
|
|
case elfcpp::R_POWERPC_REL32:
|
|
status = Reloc::addr32(view, value, overflow);
|
|
break;
|
|
|
|
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_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_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_RELSEC16:
|
|
case elfcpp::R_PPC_EMB_RELST_LO:
|
|
case elfcpp::R_PPC_EMB_RELST_HI:
|
|
case elfcpp::R_PPC_EMB_RELST_HA:
|
|
case elfcpp::R_PPC_EMB_BIT_FLD:
|
|
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)
|
|
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
|
|
_("relocation overflow"));
|
|
|
|
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;
|
|
|
|
gold_assert(sh_type == elfcpp::SHT_RELA);
|
|
|
|
unsigned char *opd_rel = NULL;
|
|
Powerpc_relobj<size, big_endian>* const object
|
|
= static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object);
|
|
if (size == 64
|
|
&& relinfo->data_shndx == object->opd_shndx())
|
|
{
|
|
// Rewrite opd relocs, omitting those for discarded sections
|
|
// to silence gold::relocate_section errors.
|
|
const int reloc_size
|
|
= Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;
|
|
opd_rel = new unsigned char[reloc_count * reloc_size];
|
|
const unsigned char* rrel = prelocs;
|
|
unsigned char* wrel = opd_rel;
|
|
|
|
for (size_t i = 0;
|
|
i < reloc_count;
|
|
++i, rrel += reloc_size, wrel += reloc_size)
|
|
{
|
|
typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc
|
|
reloc(rrel);
|
|
typename elfcpp::Elf_types<size>::Elf_WXword r_info
|
|
= reloc.get_r_info();
|
|
unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
|
|
Address r_off = reloc.get_r_offset();
|
|
if (r_type == elfcpp::R_PPC64_TOC)
|
|
r_off -= 8;
|
|
bool is_discarded = object->get_opd_discard(r_off);
|
|
|
|
// Reloc number is reported in some errors, so keep all relocs.
|
|
if (is_discarded)
|
|
memset(wrel, 0, reloc_size);
|
|
else
|
|
memcpy(wrel, rrel, reloc_size);
|
|
}
|
|
prelocs = opd_rel;
|
|
}
|
|
|
|
gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
|
|
Powerpc_relocate>(
|
|
relinfo,
|
|
this,
|
|
prelocs,
|
|
reloc_count,
|
|
output_section,
|
|
needs_special_offset_handling,
|
|
view,
|
|
address,
|
|
view_size,
|
|
reloc_symbol_changes);
|
|
|
|
if (opd_rel != NULL)
|
|
delete[] opd_rel;
|
|
}
|
|
|
|
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,
|
|
off_t 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 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());
|
|
const Output_data_glink<size, big_endian>* glink = this->glink_section();
|
|
unsigned int glink_index = glink->find_entry(gsym);
|
|
return glink->address() + glink_index * glink->glink_entry_size();
|
|
}
|
|
else
|
|
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);
|
|
const Output_data_glink<size, big_endian>* glink = this->glink_section();
|
|
unsigned int glink_index = glink->find_entry(relobj->sized_relobj(),
|
|
symndx);
|
|
return glink->address() + glink_index * glink->glink_entry_size();
|
|
}
|
|
else
|
|
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)
|
|
{
|
|
const Output_data_glink<size, big_endian>* glink = this->glink_section();
|
|
unsigned int glink_index = glink->find_entry(gsym);
|
|
return glink->address() + glink_index * glink->glink_entry_size();
|
|
}
|
|
else
|
|
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(elfcpp::EM_NONE, 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_recognize(Input_file*, off_t, int machine, int, int)
|
|
{
|
|
switch (size)
|
|
{
|
|
case 64:
|
|
if (machine != elfcpp::EM_PPC64)
|
|
return NULL;
|
|
break;
|
|
|
|
case 32:
|
|
if (machine != elfcpp::EM_PPC)
|
|
return NULL;
|
|
break;
|
|
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
return this->instantiate_target();
|
|
}
|
|
|
|
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;
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Target_selector_powerpc<64, false> target_selector_ppc64le;
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} // End anonymous namespace.
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