// target-reloc.h -- target specific relocation support -*- C++ -*-
+// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
#ifndef GOLD_TARGET_RELOC_H
#define GOLD_TARGET_RELOC_H
#include "elfcpp.h"
+#include "object.h"
#include "symtab.h"
+#include "reloc-types.h"
namespace gold
{
-// Pick the ELF relocation accessor class and the size based on
-// SH_TYPE, which is either SHT_REL or SHT_RELA.
-
-template<int sh_type, int size, bool big_endian>
-struct Reloc_types;
+// This function implements the generic part of reloc scanning. This
+// is an inline function which takes a class whose operator()
+// implements the machine specific part of scanning. We do it this
+// way to avoidmaking a function call for each relocation, and to
+// avoid repeating the generic code for each target.
-template<int size, bool big_endian>
-struct Reloc_types<elfcpp::SHT_REL, size, big_endian>
+template<int size, bool big_endian, typename Target_type, int sh_type,
+ typename Scan>
+inline void
+scan_relocs(
+ const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Target_type* target,
+ Sized_relobj<size, big_endian>* object,
+ unsigned int data_shndx,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ size_t local_count,
+ const unsigned char* plocal_syms,
+ Symbol** global_syms)
{
- typedef typename elfcpp::Rel<size, big_endian> Reloc;
- static const int reloc_size = elfcpp::Elf_sizes<size>::rel_size;
-};
+ typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
+ const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ Scan scan;
-template<int size, bool big_endian>
-struct Reloc_types<elfcpp::SHT_RELA, size, big_endian>
-{
- typedef typename elfcpp::Rela<size, big_endian> Reloc;
- static const int reloc_size = elfcpp::Elf_sizes<size>::rela_size;
-};
+ 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_sym = elfcpp::elf_r_sym<size>(r_info);
+ unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
+
+ if (r_sym < local_count)
+ {
+ gold_assert(plocal_syms != NULL);
+ typename elfcpp::Sym<size, big_endian> lsym(plocal_syms
+ + r_sym * sym_size);
+ const unsigned int shndx = lsym.get_st_shndx();
+ if (shndx < elfcpp::SHN_LORESERVE
+ && shndx != elfcpp::SHN_UNDEF
+ && !object->is_section_included(lsym.get_st_shndx()))
+ {
+ // RELOC is a relocation against a local symbol in a
+ // section we are discarding. We can ignore this
+ // relocation. It will eventually become a reloc
+ // against the value zero.
+ //
+ // FIXME: We should issue a warning if this is an
+ // allocated section; is this the best place to do it?
+ //
+ // FIXME: The old GNU linker would in some cases look
+ // for the linkonce section which caused this section to
+ // be discarded, and, if the other section was the same
+ // size, change the reloc to refer to the other section.
+ // That seems risky and weird to me, and I don't know of
+ // any case where it is actually required.
+
+ continue;
+ }
+
+ scan.local(options, symtab, layout, target, object, data_shndx,
+ reloc, r_type, lsym);
+ }
+ else
+ {
+ Symbol* gsym = global_syms[r_sym - local_count];
+ gold_assert(gsym != NULL);
+ if (gsym->is_forwarder())
+ gsym = symtab->resolve_forwards(gsym);
+
+ scan.global(options, symtab, layout, target, object, data_shndx,
+ reloc, r_type, gsym);
+ }
+ }
+}
-// This function implements the generic part of relocation handling.
-// This is an inline function which take a class whose operator()
+// This function implements the generic part of relocation processing.
+// This is an inline function which take a class whose relocate()
// implements the machine specific part of relocation. We do it this
// way to avoid making a function call for each relocation, and to
// avoid repeating the generic relocation handling code for each
// target.
// SIZE is the ELF size: 32 or 64. BIG_ENDIAN is the endianness of
-// the data. SH_TYPE is the section type: SHT_REL or SHT_RELA. RELOC
-// implements operator() to do a relocation.
-
-// OBJECT is the object for we are processing relocs. SH_TYPE is the
-// type of relocation: SHT_REL or SHT_RELA. PRELOCS points to the
-// relocation data. RELOC_COUNT is the number of relocs. LOCAL_COUNT
-// is the number of local symbols. LOCAL_VALUES holds the values of
-// the local symbols. GLOBAL_SYMS points to the global symbols. VIEW
-// is the section data, VIEW_ADDRESS is its memory address, and
-// VIEW_SIZE is the size.
-
-template<int size, bool big_endian, int sh_type, typename Relocate>
+// the data. SH_TYPE is the section type: SHT_REL or SHT_RELA.
+// RELOCATE implements operator() to do a relocation.
+
+// PRELOCS points to the relocation data. RELOC_COUNT is the number
+// of relocs. VIEW is the section data, VIEW_ADDRESS is its memory
+// address, and VIEW_SIZE is the size.
+
+template<int size, bool big_endian, typename Target_type, int sh_type,
+ typename Relocate>
inline void
relocate_section(
- const Symbol_table* symtab,
- Sized_object<size, big_endian>* object,
+ const Relocate_info<size, big_endian>* relinfo,
+ Target_type* target,
const unsigned char* prelocs,
size_t reloc_count,
- size_t local_count,
- const typename elfcpp::Elf_types<size>::Elf_Addr* local_values,
- Symbol** global_syms,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
off_t view_size)
const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
Relocate relocate;
+ unsigned int local_count = relinfo->local_symbol_count;
+ const typename Sized_relobj<size, big_endian>::Local_values* local_values =
+ relinfo->local_values;
+ const Symbol* const * global_syms = relinfo->symbols;
+
for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
{
Reltype reloc(prelocs);
off_t offset = reloc.get_r_offset();
- if (offset < 0 || offset >= view_size)
- {
- fprintf(stderr, _("%s: %s: reloc %zu has bad offset %lu\n"),
- program_name, object->name().c_str(), i,
- static_cast<unsigned long>(offset));
- gold_exit(false);
- }
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);
- Sized_symbol<size>* sym;
- typename elfcpp::Elf_types<size>::Elf_Addr value;
+ const Sized_symbol<size>* sym;
+ Symbol_value<size> symval;
+ const Symbol_value<size> *psymval;
if (r_sym < local_count)
{
sym = NULL;
- value = local_values[r_sym];
+ psymval = &(*local_values)[r_sym];
}
else
{
- Symbol* gsym = global_syms[r_sym - local_count];
- assert(gsym != NULL);
+ const Symbol* gsym = global_syms[r_sym - local_count];
+ gold_assert(gsym != NULL);
if (gsym->is_forwarder())
- gsym = symtab->resolve_forwards(gsym);
+ gsym = relinfo->symtab->resolve_forwards(gsym);
+
+ sym = static_cast<const Sized_symbol<size>*>(gsym);
+ if (sym->has_symtab_index())
+ symval.set_output_symtab_index(sym->symtab_index());
+ else
+ symval.set_no_output_symtab_entry();
+ symval.set_output_value(sym->value());
+ psymval = &symval;
+ }
- sym = static_cast<Sized_symbol<size>*>(gsym);
- value = sym->value();
+ if (!relocate.relocate(relinfo, target, i, reloc, r_type, sym, psymval,
+ view + offset, view_address + offset, view_size))
+ continue;
- if (sym->shnum() == elfcpp::SHN_UNDEF
- && sym->binding() != elfcpp::STB_WEAK)
- {
- fprintf(stderr, _("%s: %s: undefined reference to '%s'\n"),
- program_name, object->name().c_str(), sym->name());
- // gold_exit(false);
- }
+ if (offset < 0 || offset >= view_size)
+ {
+ fprintf(stderr, _("%s: %s: reloc has bad offset %zu\n"),
+ program_name, relinfo->location(i, offset).c_str(),
+ static_cast<size_t>(offset));
+ gold_exit(false);
+ }
+
+ if (sym != NULL
+ && sym->is_undefined()
+ && sym->binding() != elfcpp::STB_WEAK)
+ {
+ fprintf(stderr, _("%s: %s: undefined reference to '%s'\n"),
+ program_name, relinfo->location(i, offset).c_str(),
+ sym->name());
+ gold_exit(false);
}
- relocate(object, reloc, r_type, sym, value, view + offset,
- view_address + offset);
+ if (sym != NULL && sym->has_warning())
+ relinfo->symtab->issue_warning(sym, relinfo->location(i, offset));
}
}
projects / deliverable / binutils-gdb.git / blobdiff