// object.cc -- support for an object file for linking in gold
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
namespace gold
{
+// Struct Read_symbols_data.
+
+// Destroy any remaining File_view objects.
+
+Read_symbols_data::~Read_symbols_data()
+{
+ if (this->section_headers != NULL)
+ delete this->section_headers;
+ if (this->section_names != NULL)
+ delete this->section_names;
+ if (this->symbols != NULL)
+ delete this->symbols;
+ if (this->symbol_names != NULL)
+ delete this->symbol_names;
+ if (this->versym != NULL)
+ delete this->versym;
+ if (this->verdef != NULL)
+ delete this->verdef;
+ if (this->verneed != NULL)
+ delete this->verneed;
+}
+
// Class Xindex.
// Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
// Class Object.
-// Set the target based on fields in the ELF file header.
-
-void
-Object::set_target(int machine, int size, bool big_endian, int osabi,
- int abiversion)
-{
- Target* target = select_target(machine, size, big_endian, osabi, abiversion);
- if (target == NULL)
- gold_fatal(_("%s: unsupported ELF machine number %d"),
- this->name().c_str(), machine);
- this->target_ = target;
-}
-
// Report an error for this object file. This is used by the
// elfcpp::Elf_file interface, and also called by the Object code
// itself.
return false;
}
+// If NAME is the name of the special section which indicates that
+// this object was compiled with -fstack-split, mark it accordingly.
+
+bool
+Object::handle_split_stack_section(const char* name)
+{
+ if (strcmp(name, ".note.GNU-split-stack") == 0)
+ {
+ this->uses_split_stack_ = true;
+ return true;
+ }
+ if (strcmp(name, ".note.GNU-no-split-stack") == 0)
+ {
+ this->has_no_split_stack_ = true;
+ return true;
+ }
+ return false;
+}
+
// Class Relobj
// To copy the symbols data read from the file to a local data structure.
&& strstr(name, "personality"))
|| (is_prefix_of(".data", name)
&& strstr(name, "personality"))
- || (is_prefix_of(".gnu.linkonce.d", name) &&
- strstr(name, "personality")))
+ || (is_prefix_of(".gnu.linkonce.d", name)
+ && strstr(name, "personality")))
{
return true;
}
}
// Set up an object file based on the file header. This sets up the
-// target and reads the section information.
+// section information.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::setup(
- const elfcpp::Ehdr<size, big_endian>& ehdr)
+Sized_relobj<size, big_endian>::do_setup()
{
- this->set_target(ehdr.get_e_machine(), size, big_endian,
- ehdr.get_e_ident()[elfcpp::EI_OSABI],
- ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
-
const unsigned int shnum = this->elf_file_.shnum();
this->set_shnum(shnum);
}
// whether they should be included in the link. If they should, we
// pass them to the Layout object, which will return an output section
// and an offset.
-// During garbage collection (gc-sections), this function is called
-// twice. When it is called the first time, it is for setting up some
-// sections as roots to a work-list and to do comdat processing. Actual
-// layout happens the second time around after all the relevant sections
-// have been determined. The first time, is_worklist_ready is false.
-// It is then set to true after the worklist is processed and the relevant
-// sections are determined. Then, this function is called again to
-// layout the sections.
+// During garbage collection (--gc-sections) and identical code folding
+// (--icf), this function is called twice. When it is called the first
+// time, it is for setting up some sections as roots to a work-list for
+// --gc-sections and to do comdat processing. Actual layout happens the
+// second time around after all the relevant sections have been determined.
+// The first time, is_worklist_ready or is_icf_ready is false. It is then
+// set to true after the garbage collection worklist or identical code
+// folding is processed and the relevant sections to be kept are
+// determined. Then, this function is called again to layout the sections.
template<int size, bool big_endian>
void
Read_symbols_data* sd)
{
const unsigned int shnum = this->shnum();
- bool is_gc_pass_one = (parameters->options().gc_sections()
- && !symtab->gc()->is_worklist_ready());
- bool is_gc_pass_two = (parameters->options().gc_sections()
- && symtab->gc()->is_worklist_ready());
+ bool is_gc_pass_one = ((parameters->options().gc_sections()
+ && !symtab->gc()->is_worklist_ready())
+ || (parameters->options().icf_enabled()
+ && !symtab->icf()->is_icf_ready()));
+
+ bool is_gc_pass_two = ((parameters->options().gc_sections()
+ && symtab->gc()->is_worklist_ready())
+ || (parameters->options().icf_enabled()
+ && symtab->icf()->is_icf_ready()));
+
+ bool is_gc_or_icf = (parameters->options().gc_sections()
+ || parameters->options().icf_enabled());
+
+ // Both is_gc_pass_one and is_gc_pass_two should not be true.
+ gold_assert(!(is_gc_pass_one && is_gc_pass_two));
+
if (shnum == 0)
return;
Symbols_data* gc_sd = NULL;
const unsigned char* symbol_names_data = NULL;
section_size_type symbol_names_size;
- if (parameters->options().gc_sections())
+ if (is_gc_or_icf)
{
section_headers_data = gc_sd->section_headers_data;
section_names_size = gc_sd->section_names_size;
const unsigned char* pshdrs;
// Get the section names.
- const unsigned char* pnamesu = parameters->options().gc_sections() ?
- gc_sd->section_names_data :
- sd->section_names->data();
+ const unsigned char* pnamesu = (is_gc_or_icf)
+ ? gc_sd->section_names_data
+ : sd->section_names->data();
+
const char* pnames = reinterpret_cast<const char*>(pnamesu);
// If any input files have been claimed by plugins, we need to defer
omit[i] = true;
}
+ // The .note.GNU-split-stack section is also special. It
+ // indicates that the object was compiled with
+ // -fsplit-stack.
+ if (this->handle_split_stack_section(name))
+ {
+ if (!parameters->options().relocatable()
+ && !parameters->options().shared())
+ omit[i] = true;
+ }
+
+ // Skip attributes section.
+ if (parameters->target().is_attributes_section(name))
+ {
+ omit[i] = true;
+ }
+
bool discard = omit[i];
if (!discard)
{
}
}
- if (is_gc_pass_one)
+ if (is_gc_pass_one && parameters->options().gc_sections())
{
if (is_section_name_included(name)
|| shdr.get_sh_type() == elfcpp::SHT_INIT_ARRAY
{
symtab->gc()->worklist().push(Section_id(this, i));
}
+ // If the section name XXX can be represented as a C identifier
+ // it cannot be discarded if there are references to
+ // __start_XXX and __stop_XXX symbols. These need to be
+ // specially handled.
+ if (is_cident(name))
+ {
+ symtab->gc()->add_cident_section(name, Section_id(this, i));
+ }
}
// When doing a relocatable link we are going to copy input
continue;
}
- if (is_gc_pass_two)
+ if (is_gc_pass_two && parameters->options().gc_sections())
{
// This is executed during the second pass of garbage
// collection. do_layout has been called before and some
gold_assert(out_section_offsets[i] == invalid_address);
continue;
}
- if ((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0)
- if (symtab->gc()->referenced_list().find(Section_id(this,i))
- == symtab->gc()->referenced_list().end())
+ if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0)
+ && symtab->gc()->is_section_garbage(this, i))
{
if (parameters->options().print_gc_sections())
gold_info(_("%s: removing unused section from '%s'"
- " in file '%s"),
+ " in file '%s'"),
program_name, this->section_name(i).c_str(),
this->name().c_str());
out_sections[i] = NULL;
continue;
}
}
+
+ if (is_gc_pass_two && parameters->options().icf_enabled())
+ {
+ if (out_sections[i] == NULL)
+ {
+ gold_assert(out_section_offsets[i] == invalid_address);
+ continue;
+ }
+ if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0)
+ && symtab->icf()->is_section_folded(this, i))
+ {
+ if (parameters->options().print_icf_sections())
+ {
+ Section_id folded =
+ symtab->icf()->get_folded_section(this, i);
+ Relobj* folded_obj =
+ reinterpret_cast<Relobj*>(folded.first);
+ gold_info(_("%s: ICF folding section '%s' in file '%s'"
+ "into '%s' in file '%s'"),
+ program_name, this->section_name(i).c_str(),
+ this->name().c_str(),
+ folded_obj->section_name(folded.second).c_str(),
+ folded_obj->name().c_str());
+ }
+ out_sections[i] = NULL;
+ out_section_offsets[i] = invalid_address;
+ continue;
+ }
+ }
+
// Defer layout here if input files are claimed by plugins. When gc
// is turned on this function is called twice. For the second call
// should_defer_layout should be false.
out_sections[i] = reinterpret_cast<Output_section*>(2);
out_section_offsets[i] = invalid_address;
continue;
- }
+ }
+
// During gc_pass_two if a section that was previously deferred is
// found, do not layout the section as layout_deferred_sections will
// do it later from gold.cc.
}
}
- if (!is_gc_pass_one)
+ if (!is_gc_pass_two)
layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags);
// When doing a relocatable link handle the reloc sections at the
- // end. Garbage collection is not turned on for relocatable code.
+ // end. Garbage collection and Identical Code Folding is not
+ // turned on for relocatable code.
if (emit_relocs)
this->size_relocatable_relocs();
- gold_assert(!parameters->options().gc_sections() || reloc_sections.empty());
+
+ gold_assert(!(is_gc_or_icf) || reloc_sections.empty());
+
for (std::vector<unsigned int>::const_iterator p = reloc_sections.begin();
p != reloc_sections.end();
++p)
reloc_type[i],
&offset);
out_sections[i] = os;
- if (offset == -1)
+ if (os == NULL || offset == -1)
{
// An object can contain at most one section holding exception
// frame information.
// If this section requires special handling, and if there are
// relocs that apply to it, then we must do the special handling
// before we apply the relocs.
- if (offset == -1 && reloc_shndx[i] != 0)
+ if (os != NULL && offset == -1 && reloc_shndx[i] != 0)
this->set_relocs_must_follow_section_writes();
}
delete[] gc_sd->section_names_data;
delete[] gc_sd->symbols_data;
delete[] gc_sd->symbol_names_data;
+ this->set_symbols_data(NULL);
}
else
{
sd->symbol_names = NULL;
}
+// Find out if this object, that is a member of a lib group, should be included
+// in the link. We check every symbol defined by this object. If the symbol
+// table has a strong undefined reference to that symbol, we have to include
+// the object.
+
+template<int size, bool big_endian>
+Archive::Should_include
+Sized_relobj<size, big_endian>::do_should_include_member(Symbol_table* symtab,
+ Read_symbols_data* sd,
+ std::string* why)
+{
+ char* tmpbuf = NULL;
+ size_t tmpbuflen = 0;
+ const char* sym_names =
+ reinterpret_cast<const char*>(sd->symbol_names->data());
+ const unsigned char* syms =
+ sd->symbols->data() + sd->external_symbols_offset;
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
+ / sym_size);
+
+ const unsigned char* p = syms;
+
+ for (size_t i = 0; i < symcount; ++i, p += sym_size)
+ {
+ elfcpp::Sym<size, big_endian> sym(p);
+ unsigned int st_shndx = sym.get_st_shndx();
+ if (st_shndx == elfcpp::SHN_UNDEF)
+ continue;
+
+ unsigned int st_name = sym.get_st_name();
+ const char* name = sym_names + st_name;
+ Symbol* symbol;
+ Archive::Should_include t = Archive::should_include_member(symtab, name,
+ &symbol, why,
+ &tmpbuf,
+ &tmpbuflen);
+ if (t == Archive::SHOULD_INCLUDE_YES)
+ {
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return t;
+ }
+ }
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return Archive::SHOULD_INCLUDE_UNKNOWN;
+}
+
// First pass over the local symbols. Here we add their names to
// *POOL and *DYNPOOL, and we store the symbol value in
// THIS->LOCAL_VALUES_. This function is always called from a
unsigned int dyncount = 0;
// Skip the first, dummy, symbol.
psyms += sym_size;
+ bool discard_all = parameters->options().discard_all();
bool discard_locals = parameters->options().discard_locals();
for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
{
// Decide whether this symbol should go into the output file.
if ((shndx < shnum && out_sections[shndx] == NULL)
- || (shndx == this->discarded_eh_frame_shndx_))
+ || shndx == this->discarded_eh_frame_shndx_)
{
lv.set_no_output_symtab_entry();
gold_assert(!lv.needs_output_dynsym_entry());
continue;
}
+ const char* name = pnames + sym.get_st_name();
+
+ // If needed, add the symbol to the dynamic symbol table string pool.
+ if (lv.needs_output_dynsym_entry())
+ {
+ dynpool->add(name, true, NULL);
+ ++dyncount;
+ }
+
+ if (discard_all && lv.may_be_discarded_from_output_symtab())
+ {
+ lv.set_no_output_symtab_entry();
+ continue;
+ }
+
// If --discard-locals option is used, discard all temporary local
// symbols. These symbols start with system-specific local label
// prefixes, typically .L for ELF system. We want to be compatible
// - the symbol has a name.
//
// We do not discard a symbol if it needs a dynamic symbol entry.
- const char* name = pnames + sym.get_st_name();
if (discard_locals
&& sym.get_st_type() != elfcpp::STT_FILE
&& !lv.needs_output_dynsym_entry()
+ && lv.may_be_discarded_from_output_symtab()
&& parameters->target().is_local_label_name(name))
{
lv.set_no_output_symtab_entry();
continue;
}
+ // Discard the local symbol if -retain_symbols_file is specified
+ // and the local symbol is not in that file.
+ if (!parameters->options().should_retain_symbol(name))
+ {
+ lv.set_no_output_symtab_entry();
+ continue;
+ }
+
// Add the symbol to the symbol table string pool.
pool->add(name, true, NULL);
++count;
-
- // If needed, add the symbol to the dynamic symbol table string pool.
- if (lv.needs_output_dynsym_entry())
- {
- dynpool->add(name, true, NULL);
- ++dyncount;
- }
}
this->output_local_symbol_count_ = count;
template<int size, bool big_endian>
unsigned int
Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index,
- off_t off)
+ off_t off,
+ Symbol_table* symtab)
{
gold_assert(off == static_cast<off_t>(align_address(off, size >> 3)));
}
Output_section* os = out_sections[shndx];
+ Address secoffset = out_offsets[shndx];
+ if (symtab->is_section_folded(this, shndx))
+ {
+ gold_assert (os == NULL && secoffset == invalid_address);
+ // Get the os of the section it is folded onto.
+ Section_id folded = symtab->icf()->get_folded_section(this,
+ shndx);
+ gold_assert(folded.first != NULL);
+ Sized_relobj<size, big_endian>* folded_obj = reinterpret_cast
+ <Sized_relobj<size, big_endian>*>(folded.first);
+ os = folded_obj->output_section(folded.second);
+ gold_assert(os != NULL);
+ secoffset = folded_obj->get_output_section_offset(folded.second);
+
+ // This could be a relaxed input section.
+ if (secoffset == invalid_address)
+ {
+ const Output_relaxed_input_section* relaxed_section =
+ os->find_relaxed_input_section(folded_obj, folded.second);
+ gold_assert(relaxed_section != NULL);
+ secoffset = relaxed_section->address() - os->address();
+ }
+ }
if (os == NULL)
{
// so we leave the input value unchanged here.
continue;
}
- else if (out_offsets[shndx] == invalid_address)
+ else if (secoffset == invalid_address)
{
uint64_t start;
}
else if (!os->find_starting_output_address(this, shndx, &start))
{
- // This is a section symbol, but apparently not one
- // in a merged section. Just use the start of the
- // output section. This happens with relocatable
- // links when the input object has section symbols
- // for arbitrary non-merge sections.
- lv.set_output_value(os->address());
+ // This is a section symbol, but apparently not one in a
+ // merged section. First check to see if this is a relaxed
+ // input section. If so, use its address. Otherwise just
+ // use the start of the output section. This happens with
+ // relocatable links when the input object has section
+ // symbols for arbitrary non-merge sections.
+ const Output_section_data* posd =
+ os->find_relaxed_input_section(this, shndx);
+ if (posd != NULL)
+ lv.set_output_value(posd->address());
+ else
+ lv.set_output_value(os->address());
}
else
{
}
else if (lv.is_tls_symbol())
lv.set_output_value(os->tls_offset()
- + out_offsets[shndx]
+ + secoffset
+ lv.input_value());
else
lv.set_output_value((relocatable ? 0 : os->address())
- + out_offsets[shndx]
+ + secoffset
+ lv.input_value());
}
- if (lv.needs_output_symtab_entry())
+ if (!lv.is_output_symtab_index_set())
{
lv.set_output_symtab_index(index);
++index;
return this->output_local_dynsym_count_;
}
+// If Symbols_data is not NULL get the section flags from here otherwise
+// get it from the file.
+
+template<int size, bool big_endian>
+uint64_t
+Sized_relobj<size, big_endian>::do_section_flags(unsigned int shndx)
+{
+ Symbols_data* sd = this->get_symbols_data();
+ if (sd != NULL)
+ {
+ const unsigned char* pshdrs = sd->section_headers_data
+ + This::shdr_size * shndx;
+ typename This::Shdr shdr(pshdrs);
+ return shdr.get_sh_flags();
+ }
+ // If sd is NULL, read the section header from the file.
+ return this->elf_file_.section_flags(shndx);
+}
+
+// Get the section's ent size from Symbols_data. Called by get_section_contents
+// in icf.cc
+
+template<int size, bool big_endian>
+uint64_t
+Sized_relobj<size, big_endian>::do_section_entsize(unsigned int shndx)
+{
+ Symbols_data* sd = this->get_symbols_data();
+ gold_assert (sd != NULL);
+
+ const unsigned char* pshdrs = sd->section_headers_data
+ + This::shdr_size * shndx;
+ typename This::Shdr shdr(pshdrs);
+ return shdr.get_sh_entsize();
+}
+
+
// Write out the local symbols.
template<int size, bool big_endian>
st_shndx = out_sections[st_shndx]->out_shndx();
if (st_shndx >= elfcpp::SHN_LORESERVE)
{
- if (lv.needs_output_symtab_entry() && !strip_all)
+ if (lv.has_output_symtab_entry())
symtab_xindex->add(lv.output_symtab_index(), st_shndx);
- if (lv.needs_output_dynsym_entry())
+ if (lv.has_output_dynsym_entry())
dynsym_xindex->add(lv.output_dynsym_index(), st_shndx);
st_shndx = elfcpp::SHN_XINDEX;
}
}
// Write the symbol to the output symbol table.
- if (!strip_all && lv.needs_output_symtab_entry())
+ if (lv.has_output_symtab_entry())
{
elfcpp::Sym_write<size, big_endian> osym(ov);
}
// Write the symbol to the output dynamic symbol table.
- if (lv.needs_output_dynsym_entry())
+ if (lv.has_output_dynsym_entry())
{
gold_assert(dyn_ov < dyn_oview + dyn_output_size);
elfcpp::Sym_write<size, big_endian> osym(dyn_ov);
bool
Input_objects::add_object(Object* obj)
{
- // Set the global target from the first object file we recognize.
- Target* target = obj->target();
- if (!parameters->target_valid())
- set_parameters_target(target);
- else if (target != ¶meters->target())
- {
- obj->error(_("incompatible target"));
- return false;
- }
-
// Print the filename if the -t/--trace option is selected.
if (parameters->options().trace())
gold_info("%s", obj->name().c_str());
}
// Add this object to the cross-referencer if requested.
- if (parameters->options().user_set_print_symbol_counts())
+ if (parameters->options().user_set_print_symbol_counts()
+ || parameters->options().cref())
{
if (this->cref_ == NULL)
this->cref_ = new Cref();
void
Input_objects::check_dynamic_dependencies() const
{
+ bool issued_copy_dt_needed_error = false;
for (Dynobj_list::const_iterator p = this->dynobj_list_.begin();
p != this->dynobj_list_.end();
++p)
{
const Dynobj::Needed& needed((*p)->needed());
bool found_all = true;
- for (Dynobj::Needed::const_iterator pneeded = needed.begin();
- pneeded != needed.end();
- ++pneeded)
+ Dynobj::Needed::const_iterator pneeded;
+ for (pneeded = needed.begin(); pneeded != needed.end(); ++pneeded)
{
if (this->sonames_.find(*pneeded) == this->sonames_.end())
{
}
}
(*p)->set_has_unknown_needed_entries(!found_all);
+
+ // --copy-dt-needed-entries aka --add-needed is a GNU ld option
+ // that gold does not support. However, they cause no trouble
+ // unless there is a DT_NEEDED entry that we don't know about;
+ // warn only in that case.
+ if (!found_all
+ && !issued_copy_dt_needed_error
+ && (parameters->options().copy_dt_needed_entries()
+ || parameters->options().add_needed()))
+ {
+ const char* optname;
+ if (parameters->options().copy_dt_needed_entries())
+ optname = "--copy-dt-needed-entries";
+ else
+ optname = "--add-needed";
+ gold_error(_("%s is not supported but is required for %s in %s"),
+ optname, (*pneeded).c_str(), (*p)->name().c_str());
+ issued_copy_dt_needed_error = true;
+ }
}
}
void
Input_objects::archive_start(Archive* archive)
{
- if (parameters->options().user_set_print_symbol_counts())
+ if (parameters->options().user_set_print_symbol_counts()
+ || parameters->options().cref())
{
if (this->cref_ == NULL)
this->cref_ = new Cref();
void
Input_objects::archive_stop(Archive* archive)
{
- if (parameters->options().user_set_print_symbol_counts())
+ if (parameters->options().user_set_print_symbol_counts()
+ || parameters->options().cref())
this->cref_->add_archive_stop(archive);
}
this->cref_->print_symbol_counts(symtab);
}
+// Print a cross reference table.
+
+void
+Input_objects::print_cref(const Symbol_table* symtab, FILE* f) const
+{
+ if (parameters->options().cref() && this->cref_ != NULL)
+ this->cref_->print_cref(symtab, f);
+}
+
// Relocate_info methods.
// Return a string describing the location of a relocation. This is
template<int size, bool big_endian>
Object*
make_elf_sized_object(const std::string& name, Input_file* input_file,
- off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
+ off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr,
+ bool* punconfigured)
{
- int et = ehdr.get_e_type();
- if (et == elfcpp::ET_REL)
- {
- Sized_relobj<size, big_endian>* obj =
- new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr);
- obj->setup(ehdr);
- 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(ehdr);
- return obj;
- }
- else
+ Target* target = select_target(ehdr.get_e_machine(), size, big_endian,
+ ehdr.get_e_ident()[elfcpp::EI_OSABI],
+ ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
+ if (target == NULL)
+ gold_fatal(_("%s: unsupported ELF machine number %d"),
+ name.c_str(), ehdr.get_e_machine());
+
+ if (!parameters->target_valid())
+ set_parameters_target(target);
+ else if (target != ¶meters->target())
{
- gold_error(_("%s: unsupported ELF file type %d"),
- name.c_str(), et);
+ if (punconfigured != NULL)
+ *punconfigured = true;
+ else
+ gold_error(_("%s: incompatible target"), name.c_str());
return NULL;
}
+
+ return target->make_elf_object<size, big_endian>(name, input_file, offset,
+ ehdr);
}
} // End anonymous namespace.
const unsigned char** start, int *read_size)
{
off_t filesize = input_file->file().filesize();
- int want = elfcpp::Elf_sizes<64>::ehdr_size;
+ int want = elfcpp::Elf_recognizer::max_header_size;
if (filesize - offset < want)
want = filesize - offset;
*start = p;
*read_size = want;
- if (want < 4)
- return false;
-
- static unsigned char elfmagic[4] =
- {
- elfcpp::ELFMAG0, elfcpp::ELFMAG1,
- elfcpp::ELFMAG2, elfcpp::ELFMAG3
- };
- return memcmp(p, elfmagic, 4) == 0;
+ return elfcpp::Elf_recognizer::is_elf_file(p, want);
}
// Read an ELF file and return the appropriate instance of Object.
if (punconfigured != NULL)
*punconfigured = false;
- if (bytes < elfcpp::EI_NIDENT)
- {
- gold_error(_("%s: ELF file too short"), name.c_str());
- return NULL;
- }
-
- int v = p[elfcpp::EI_VERSION];
- if (v != elfcpp::EV_CURRENT)
- {
- if (v == elfcpp::EV_NONE)
- gold_error(_("%s: invalid ELF version 0"), name.c_str());
- else
- gold_error(_("%s: unsupported ELF version %d"), name.c_str(), v);
- return NULL;
- }
-
- int c = p[elfcpp::EI_CLASS];
- if (c == elfcpp::ELFCLASSNONE)
- {
- gold_error(_("%s: invalid ELF class 0"), name.c_str());
- return NULL;
- }
- else if (c != elfcpp::ELFCLASS32
- && c != elfcpp::ELFCLASS64)
- {
- gold_error(_("%s: unsupported ELF class %d"), name.c_str(), c);
- return NULL;
- }
-
- int d = p[elfcpp::EI_DATA];
- if (d == elfcpp::ELFDATANONE)
+ std::string error;
+ bool big_endian = false;
+ int size = 0;
+ if (!elfcpp::Elf_recognizer::is_valid_header(p, bytes, &size,
+ &big_endian, &error))
{
- gold_error(_("%s: invalid ELF data encoding"), name.c_str());
+ gold_error(_("%s: %s"), name.c_str(), error.c_str());
return NULL;
}
- else if (d != elfcpp::ELFDATA2LSB
- && d != elfcpp::ELFDATA2MSB)
- {
- gold_error(_("%s: unsupported ELF data encoding %d"), name.c_str(), d);
- return NULL;
- }
-
- bool big_endian = d == elfcpp::ELFDATA2MSB;
- if (c == elfcpp::ELFCLASS32)
+ if (size == 32)
{
- if (bytes < elfcpp::Elf_sizes<32>::ehdr_size)
- {
- gold_error(_("%s: ELF file too short"), name.c_str());
- return NULL;
- }
if (big_endian)
{
#ifdef HAVE_TARGET_32_BIG
elfcpp::Ehdr<32, true> ehdr(p);
return make_elf_sized_object<32, true>(name, input_file,
- offset, ehdr);
+ offset, ehdr, punconfigured);
#else
if (punconfigured != NULL)
*punconfigured = true;
#ifdef HAVE_TARGET_32_LITTLE
elfcpp::Ehdr<32, false> ehdr(p);
return make_elf_sized_object<32, false>(name, input_file,
- offset, ehdr);
+ offset, ehdr, punconfigured);
#else
if (punconfigured != NULL)
*punconfigured = true;
#endif
}
}
- else
+ else if (size == 64)
{
- if (bytes < elfcpp::Elf_sizes<64>::ehdr_size)
- {
- gold_error(_("%s: ELF file too short"), name.c_str());
- return NULL;
- }
if (big_endian)
{
#ifdef HAVE_TARGET_64_BIG
elfcpp::Ehdr<64, true> ehdr(p);
return make_elf_sized_object<64, true>(name, input_file,
- offset, ehdr);
+ offset, ehdr, punconfigured);
#else
if (punconfigured != NULL)
*punconfigured = true;
#ifdef HAVE_TARGET_64_LITTLE
elfcpp::Ehdr<64, false> ehdr(p);
return make_elf_sized_object<64, false>(name, input_file,
- offset, ehdr);
+ offset, ehdr, punconfigured);
#else
if (punconfigured != NULL)
*punconfigured = true;
#endif
}
}
+ else
+ gold_unreachable();
}
// Instantiate the templates we need.
struct Relocate_info<64, true>;
#endif
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Xindex::initialize_symtab_xindex<32, false>(Object*, unsigned int);
+
+template
+void
+Xindex::read_symtab_xindex<32, false>(Object*, unsigned int,
+ const unsigned char*);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Xindex::initialize_symtab_xindex<32, true>(Object*, unsigned int);
+
+template
+void
+Xindex::read_symtab_xindex<32, true>(Object*, unsigned int,
+ const unsigned char*);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Xindex::initialize_symtab_xindex<64, false>(Object*, unsigned int);
+
+template
+void
+Xindex::read_symtab_xindex<64, false>(Object*, unsigned int,
+ const unsigned char*);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Xindex::initialize_symtab_xindex<64, true>(Object*, unsigned int);
+
+template
+void
+Xindex::read_symtab_xindex<64, true>(Object*, unsigned int,
+ const unsigned char*);
+#endif
+
} // End namespace gold.
projects / binutils-gdb.git / blobdiff