// copy-relocs.cc -- handle COPY relocations for gold.
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright (C) 2006-2024 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
namespace gold
{
-// Copy_relocs::Copy_reloc_entry methods.
-
-// Emit the reloc if appropriate.
-
-template<int sh_type, int size, bool big_endian>
-void
-Copy_relocs<sh_type, size, big_endian>::Copy_reloc_entry::emit(
- Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
-{
- // If the symbol is no longer defined in a dynamic object, then we
- // emitted a COPY relocation, and we do not want to emit this
- // dynamic relocation.
- if (this->sym_->is_from_dynobj())
- reloc_section->add_global(this->sym_, this->reloc_type_,
- this->output_section_, this->relobj_,
- this->shndx_, this->address_,
- this->addend_);
-}
-
// Copy_relocs methods.
// Handle a relocation against a symbol which may force us to generate
Symbol_table* symtab,
Layout* layout,
Sized_symbol<size>* sym,
- Sized_relobj<size, big_endian>* object,
+ Sized_relobj_file<size, big_endian>* object,
unsigned int shndx,
- Output_section *output_section,
- const Reloc& rel,
+ Output_section* output_section,
+ unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
+ typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
{
if (this->need_copy_reloc(sym, object, shndx))
- this->emit_copy_reloc(symtab, layout, sym, reloc_section);
+ this->make_copy_reloc(symtab, layout, sym, object, reloc_section);
else
{
// We may not need a COPY relocation. Save this relocation to
// possibly be emitted later.
- this->save(sym, object, shndx, output_section, rel);
+ this->save(sym, object, shndx, output_section,
+ r_type, r_offset, r_addend);
}
}
bool
Copy_relocs<sh_type, size, big_endian>::need_copy_reloc(
Sized_symbol<size>* sym,
- Sized_relobj<size, big_endian>* object,
+ Sized_relobj_file<size, big_endian>* object,
unsigned int shndx) const
{
if (!parameters->options().copyreloc())
template<int sh_type, int size, bool big_endian>
void
Copy_relocs<sh_type, size, big_endian>::emit_copy_reloc(
+ Symbol_table* symtab,
+ Sized_symbol<size>* sym,
+ Output_data* posd,
+ off_t offset,
+ Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
+{
+ // Define the symbol as being copied.
+ symtab->define_with_copy_reloc(sym, posd, offset);
+
+ // Add the COPY relocation to the dynamic reloc section.
+ reloc_section->add_global_generic(sym, this->copy_reloc_type_, posd,
+ offset, 0);
+}
+
+// Make a COPY relocation for SYM and emit it.
+
+template<int sh_type, int size, bool big_endian>
+void
+Copy_relocs<sh_type, size, big_endian>::make_copy_reloc(
Symbol_table* symtab,
Layout* layout,
Sized_symbol<size>* sym,
+ Sized_relobj_file<size, big_endian>* object,
Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
{
// We should not be here if -z nocopyreloc is given.
gold_assert(parameters->options().copyreloc());
+ gold_assert(sym->is_from_dynobj());
+
+ // The symbol must not have protected visibility.
+ if (sym->is_protected())
+ {
+ gold_error(_("%s: cannot make copy relocation for "
+ "protected symbol '%s', defined in %s"),
+ object->name().c_str(),
+ sym->name(),
+ sym->object()->name().c_str());
+ }
+
typename elfcpp::Elf_types<size>::Elf_WXword symsize = sym->symsize();
// There is no defined way to determine the required alignment of
// is defined; presumably we do not require an alignment larger than
// that. Then we reduce that alignment if the symbol is not aligned
// within the section.
- gold_assert(sym->is_from_dynobj());
bool is_ordinary;
unsigned int shndx = sym->shndx(&is_ordinary);
gold_assert(is_ordinary);
- typename elfcpp::Elf_types<size>::Elf_WXword addralign =
- sym->object()->section_addralign(shndx);
+ typename elfcpp::Elf_types<size>::Elf_WXword addralign;
+ bool is_readonly = false;
+
+ {
+ // Lock the object so we can read from it. This is only called
+ // single-threaded from scan_relocs, so it is OK to lock.
+ // Unfortunately we have no way to pass in a Task token.
+ const Task* dummy_task = reinterpret_cast<const Task*>(-1);
+ Object* obj = sym->object();
+ Task_lock_obj<Object> tl(dummy_task, obj);
+ addralign = obj->section_addralign(shndx);
+ if (parameters->options().relro())
+ {
+ if ((obj->section_flags(shndx) & elfcpp::SHF_WRITE) == 0)
+ is_readonly = true;
+ else
+ {
+ // Symbols in .data.rel.ro should also be treated as read-only.
+ if (obj->section_name(shndx) == ".data.rel.ro")
+ is_readonly = true;
+ }
+ }
+ }
typename Sized_symbol<size>::Value_type value = sym->value();
while ((value & (addralign - 1)) != 0)
// Mark the dynamic object as needed for the --as-needed option.
sym->object()->set_is_needed();
- if (this->dynbss_ == NULL)
+ Output_data_space* dynbss;
+
+ if (is_readonly)
{
- this->dynbss_ = new Output_data_space(addralign, "** dynbss");
- layout->add_output_section_data(".bss",
- elfcpp::SHT_NOBITS,
- elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
- this->dynbss_, false, false, false,
- false);
+ if (this->dynrelro_ == NULL)
+ {
+ this->dynrelro_ = new Output_data_space(addralign, "** dynrelro");
+ layout->add_output_section_data(".data.rel.ro",
+ elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->dynrelro_, ORDER_RELRO, false);
+ }
+ dynbss = this->dynrelro_;
+ }
+ else
+ {
+ if (this->dynbss_ == NULL)
+ {
+ this->dynbss_ = new Output_data_space(addralign, "** dynbss");
+ layout->add_output_section_data(".bss",
+ elfcpp::SHT_NOBITS,
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->dynbss_, ORDER_BSS, false);
+ }
+ dynbss = this->dynbss_;
}
-
- Output_data_space* dynbss = this->dynbss_;
if (addralign > dynbss->addralign())
dynbss->set_space_alignment(addralign);
section_size_type offset = dynbss_size;
dynbss->set_current_data_size(dynbss_size + symsize);
- // Define the symbol as being copied.
- symtab->define_with_copy_reloc(sym, dynbss, offset);
-
- // Add the COPY relocation to the dynamic reloc section.
- this->add_copy_reloc(sym, offset, reloc_section);
-}
-
-// Add a COPY relocation for SYM to RELOC_SECTION.
-
-template<int sh_type, int size, bool big_endian>
-void
-Copy_relocs<sh_type, size, big_endian>::add_copy_reloc(
- Symbol* sym,
- section_size_type offset,
- Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
-{
- reloc_section->add_global(sym, this->copy_reloc_type_, this->dynbss_,
- offset, 0);
+ this->emit_copy_reloc(symtab, sym, dynbss, offset, reloc_section);
}
// Save a relocation to possibly be emitted later.
void
Copy_relocs<sh_type, size, big_endian>::save(
Symbol* sym,
- Sized_relobj<size, big_endian>* object,
+ Sized_relobj_file<size, big_endian>* object,
unsigned int shndx,
Output_section* output_section,
- const Reloc& rel)
+ unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
+ typename elfcpp::Elf_types<size>::Elf_Swxword r_addend)
{
- unsigned int reloc_type = elfcpp::elf_r_type<size>(rel.get_r_info());
- typename elfcpp::Elf_types<size>::Elf_Addr addend =
- Reloc_types<sh_type, size, big_endian>::get_reloc_addend_noerror(&rel);
- this->entries_.push_back(Copy_reloc_entry(sym, reloc_type, object, shndx,
- output_section, rel.get_r_offset(),
- addend));
+ this->entries_.push_back(Copy_reloc_entry(sym, r_type, object, shndx,
+ output_section, r_offset,
+ r_addend));
}
// Emit any saved relocs.
for (typename Copy_reloc_entries::iterator p = this->entries_.begin();
p != this->entries_.end();
++p)
- p->emit(reloc_section);
+ {
+ Copy_reloc_entry& entry = *p;
+
+ // If the symbol is no longer defined in a dynamic object, then we
+ // emitted a COPY relocation, and we do not want to emit this
+ // dynamic relocation.
+ if (entry.sym_->is_from_dynobj())
+ reloc_section->add_global_generic(entry.sym_, entry.reloc_type_,
+ entry.output_section_, entry.relobj_,
+ entry.shndx_, entry.address_,
+ entry.addend_);
+ }
// We no longer need the saved information.
this->entries_.clear();
projects / thirdparty / binutils-gdb.git / blobdiff