230 lines
7.5 KiB
C++
230 lines
7.5 KiB
C++
// target-reloc.h -- target specific relocation support -*- C++ -*-
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// Copyright 2006, 2007 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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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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#ifndef GOLD_TARGET_RELOC_H
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#define GOLD_TARGET_RELOC_H
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#include "elfcpp.h"
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#include "symtab.h"
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#include "reloc-types.h"
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namespace gold
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{
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// This function implements the generic part of reloc scanning. This
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// is an inline function which takes a class whose member functions
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// local() and global() implement the machine specific part of scanning.
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// We do it this way to avoidmaking a function call for each relocation,
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// and to avoid repeating the generic code for each target.
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template<int size, bool big_endian, typename Target_type, int sh_type,
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typename Scan>
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inline void
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scan_relocs(
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const General_options& options,
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Symbol_table* symtab,
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Layout* layout,
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Target_type* target,
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Sized_relobj<size, big_endian>* object,
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unsigned int data_shndx,
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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_count,
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const unsigned char* plocal_syms)
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{
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typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
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const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
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const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
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Scan scan;
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for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
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{
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Reltype reloc(prelocs);
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if (needs_special_offset_handling
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&& !output_section->is_input_address_mapped(object, data_shndx,
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reloc.get_r_offset()))
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continue;
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typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
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unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
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unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
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if (r_sym < local_count)
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{
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gold_assert(plocal_syms != NULL);
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typename elfcpp::Sym<size, big_endian> lsym(plocal_syms
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+ r_sym * sym_size);
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const unsigned int shndx = lsym.get_st_shndx();
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if (shndx < elfcpp::SHN_LORESERVE
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&& shndx != elfcpp::SHN_UNDEF
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&& !object->is_section_included(lsym.get_st_shndx()))
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{
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// RELOC is a relocation against a local symbol in a
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// section we are discarding. We can ignore this
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// relocation. It will eventually become a reloc
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// against the value zero.
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//
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// FIXME: We should issue a warning if this is an
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// allocated section; is this the best place to do it?
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//
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// FIXME: The old GNU linker would in some cases look
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// for the linkonce section which caused this section to
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// be discarded, and, if the other section was the same
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// size, change the reloc to refer to the other section.
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// That seems risky and weird to me, and I don't know of
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// any case where it is actually required.
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continue;
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}
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scan.local(options, symtab, layout, target, object, data_shndx,
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reloc, r_type, lsym);
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}
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else
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{
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Symbol* gsym = object->global_symbol(r_sym);
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gold_assert(gsym != NULL);
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if (gsym->is_forwarder())
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gsym = symtab->resolve_forwards(gsym);
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scan.global(options, symtab, layout, target, object, data_shndx,
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reloc, r_type, gsym);
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}
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}
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}
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// This function implements the generic part of relocation processing.
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// This is an inline function which take a class whose relocate()
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// implements the machine specific part of relocation. We do it this
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// way to avoid making a function call for each relocation, and to
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// avoid repeating the generic relocation handling code for each
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// target.
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// SIZE is the ELF size: 32 or 64. BIG_ENDIAN is the endianness of
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// the data. SH_TYPE is the section type: SHT_REL or SHT_RELA.
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// RELOCATE implements operator() to do a relocation.
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// PRELOCS points to the relocation data. RELOC_COUNT is the number
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// of relocs. OUTPUT_SECTION is the output section.
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// NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
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// mapped to output offsets.
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// VIEW is the section data, VIEW_ADDRESS is its memory address, and
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// VIEW_SIZE is the size. These refer to the input section, unless
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// NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
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// the output section.
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template<int size, bool big_endian, typename Target_type, int sh_type,
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typename Relocate>
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inline void
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relocate_section(
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const Relocate_info<size, big_endian>* relinfo,
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Target_type* target,
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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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typename elfcpp::Elf_types<size>::Elf_Addr view_address,
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off_t view_size)
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{
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typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
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const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
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Relocate relocate;
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Sized_relobj<size, big_endian>* object = relinfo->object;
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unsigned int local_count = object->local_symbol_count();
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for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
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{
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Reltype reloc(prelocs);
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off_t offset = reloc.get_r_offset();
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if (needs_special_offset_handling)
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{
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offset = output_section->output_offset(relinfo->object,
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relinfo->data_shndx,
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offset);
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if (offset == -1)
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continue;
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}
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typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
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unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
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unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
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const Sized_symbol<size>* sym;
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Symbol_value<size> symval;
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const Symbol_value<size> *psymval;
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if (r_sym < local_count)
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{
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sym = NULL;
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psymval = object->local_symbol(r_sym);
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}
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else
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{
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const Symbol* gsym = object->global_symbol(r_sym);
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gold_assert(gsym != NULL);
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if (gsym->is_forwarder())
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gsym = relinfo->symtab->resolve_forwards(gsym);
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sym = static_cast<const Sized_symbol<size>*>(gsym);
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if (sym->has_symtab_index())
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symval.set_output_symtab_index(sym->symtab_index());
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else
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symval.set_no_output_symtab_entry();
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symval.set_output_value(sym->value());
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psymval = &symval;
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}
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if (!relocate.relocate(relinfo, target, i, reloc, r_type, sym, psymval,
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view + offset, view_address + offset, view_size))
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continue;
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if (offset < 0 || offset >= view_size)
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{
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gold_error_at_location(relinfo, i, offset,
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_("reloc has bad offset %zu"),
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static_cast<size_t>(offset));
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continue;
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}
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if (sym != NULL
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&& sym->is_undefined()
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&& sym->binding() != elfcpp::STB_WEAK
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&& !parameters->output_is_shared())
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gold_undefined_symbol(sym, relinfo, i, offset);
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if (sym != NULL && sym->has_warning())
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relinfo->symtab->issue_warning(sym, relinfo, i, offset);
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}
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}
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} // End namespace gold.
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#endif // !defined(GOLD_TARGET_RELOC_H)
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