}
// If NAME is the name of the special section which indicates that
-// this object was compiled with -fstack-split, mark it accordingly.
+// this object was compiled with -fsplit-stack, mark it accordingly.
bool
Object::handle_split_stack_section(const char* name)
// Finalize the incremental relocation information. Allocates a block
// of relocation entries for each symbol, and sets the reloc_bases_
// array to point to the first entry in each block. Returns the next
-// available reloation index.
+// available relocation index.
void
Relobj::finalize_incremental_relocs(Layout* layout)
// Return the section index of symbol SYM. Set *VALUE to its value in
// the object file. Set *IS_ORDINARY if this is an ordinary section
-// index. not a special cod between SHN_LORESERVE and SHN_HIRESERVE.
+// index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
// Note that for a symbol which is not defined in this object file,
// this will set *VALUE to 0 and return SHN_UNDEF; it will not return
// the final value of the symbol in the link.
}
if (!is_gc_pass_two)
- layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags);
+ layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this);
// When doing a relocatable link handle the reloc sections at the
// end. Garbage collection and Identical Code Folding is not
gold_assert(external_symbols_offset != 0);
unsigned int i = *p;
- const unsigned char *pshdr;
+ const unsigned char* pshdr;
pshdr = section_headers_data + i * This::shdr_size;
typename This::Shdr shdr(pshdr);
this->output_local_dynsym_count_ = dyncount;
}
+// Compute the final value of a local symbol.
+
+template<int size, bool big_endian>
+typename Sized_relobj<size, big_endian>::Compute_final_local_value_status
+Sized_relobj<size, big_endian>::compute_final_local_value_internal(
+ unsigned int r_sym,
+ const Symbol_value<size>* lv_in,
+ Symbol_value<size>* lv_out,
+ bool relocatable,
+ const Output_sections& out_sections,
+ const std::vector<Address>& out_offsets,
+ const Symbol_table* symtab)
+{
+ // We are going to overwrite *LV_OUT, if it has a merged symbol value,
+ // we may have a memory leak.
+ gold_assert(lv_out->has_output_value());
+
+ bool is_ordinary;
+ unsigned int shndx = lv_in->input_shndx(&is_ordinary);
+
+ // Set the output symbol value.
+
+ if (!is_ordinary)
+ {
+ if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx))
+ lv_out->set_output_value(lv_in->input_value());
+ else
+ {
+ this->error(_("unknown section index %u for local symbol %u"),
+ shndx, r_sym);
+ lv_out->set_output_value(0);
+ return This::CFLV_ERROR;
+ }
+ }
+ else
+ {
+ if (shndx >= this->shnum())
+ {
+ this->error(_("local symbol %u section index %u out of range"),
+ r_sym, shndx);
+ lv_out->set_output_value(0);
+ return This::CFLV_ERROR;
+ }
+
+ 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)
+ {
+ // This local symbol belongs to a section we are discarding.
+ // In some cases when applying relocations later, we will
+ // attempt to match it to the corresponding kept section,
+ // so we leave the input value unchanged here.
+ return This::CFLV_DISCARDED;
+ }
+ else if (secoffset == invalid_address)
+ {
+ uint64_t start;
+
+ // This is a SHF_MERGE section or one which otherwise
+ // requires special handling.
+ if (shndx == this->discarded_eh_frame_shndx_)
+ {
+ // This local symbol belongs to a discarded .eh_frame
+ // section. Just treat it like the case in which
+ // os == NULL above.
+ gold_assert(this->has_eh_frame_);
+ return This::CFLV_DISCARDED;
+ }
+ else if (!lv_in->is_section_symbol())
+ {
+ // This is not a section symbol. We can determine
+ // the final value now.
+ lv_out->set_output_value(
+ os->output_address(this, shndx, lv_in->input_value()));
+ }
+ else if (!os->find_starting_output_address(this, shndx, &start))
+ {
+ // 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)
+ {
+ Address relocatable_link_adjustment =
+ relocatable ? os->address() : 0;
+ lv_out->set_output_value(posd->address()
+ - relocatable_link_adjustment);
+ }
+ else
+ lv_out->set_output_value(os->address());
+ }
+ else
+ {
+ // We have to consider the addend to determine the
+ // value to use in a relocation. START is the start
+ // of this input section. If we are doing a relocatable
+ // link, use offset from start output section instead of
+ // address.
+ Address adjusted_start =
+ relocatable ? start - os->address() : start;
+ Merged_symbol_value<size>* msv =
+ new Merged_symbol_value<size>(lv_in->input_value(),
+ adjusted_start);
+ lv_out->set_merged_symbol_value(msv);
+ }
+ }
+ else if (lv_in->is_tls_symbol())
+ lv_out->set_output_value(os->tls_offset()
+ + secoffset
+ + lv_in->input_value());
+ else
+ lv_out->set_output_value((relocatable ? 0 : os->address())
+ + secoffset
+ + lv_in->input_value());
+ }
+ return This::CFLV_OK;
+}
+
+// Compute final local symbol value. R_SYM is the index of a local
+// symbol in symbol table. LV points to a symbol value, which is
+// expected to hold the input value and to be over-written by the
+// final value. SYMTAB points to a symbol table. Some targets may want
+// to know would-be-finalized local symbol values in relaxation.
+// Hence we provide this method. Since this method updates *LV, a
+// callee should make a copy of the original local symbol value and
+// use the copy instead of modifying an object's local symbols before
+// everything is finalized. The caller should also free up any allocated
+// memory in the return value in *LV.
+template<int size, bool big_endian>
+typename Sized_relobj<size, big_endian>::Compute_final_local_value_status
+Sized_relobj<size, big_endian>::compute_final_local_value(
+ unsigned int r_sym,
+ const Symbol_value<size>* lv_in,
+ Symbol_value<size>* lv_out,
+ const Symbol_table* symtab)
+{
+ // This is just a wrapper of compute_final_local_value_internal.
+ const bool relocatable = parameters->options().relocatable();
+ const Output_sections& out_sections(this->output_sections());
+ const std::vector<Address>& out_offsets(this->section_offsets_);
+ return this->compute_final_local_value_internal(r_sym, lv_in, lv_out,
+ relocatable, out_sections,
+ out_offsets, symtab);
+}
+
// Finalize the local symbols. Here we set the final value in
// THIS->LOCAL_VALUES_ and set their output symbol table indexes.
// This function is always called from a singleton thread. The actual
const bool relocatable = parameters->options().relocatable();
const Output_sections& out_sections(this->output_sections());
const std::vector<Address>& out_offsets(this->section_offsets_);
- unsigned int shnum = this->shnum();
for (unsigned int i = 1; i < loccount; ++i)
{
- Symbol_value<size>& lv(this->local_values_[i]);
-
- bool is_ordinary;
- unsigned int shndx = lv.input_shndx(&is_ordinary);
+ Symbol_value<size>* lv = &this->local_values_[i];
- // Set the output symbol value.
-
- if (!is_ordinary)
+ Compute_final_local_value_status cflv_status =
+ this->compute_final_local_value_internal(i, lv, lv, relocatable,
+ out_sections, out_offsets,
+ symtab);
+ switch (cflv_status)
{
- if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx))
- lv.set_output_value(lv.input_value());
- else
+ case CFLV_OK:
+ if (!lv->is_output_symtab_index_set())
{
- this->error(_("unknown section index %u for local symbol %u"),
- shndx, i);
- lv.set_output_value(0);
+ lv->set_output_symtab_index(index);
+ ++index;
}
+ break;
+ case CFLV_DISCARDED:
+ case CFLV_ERROR:
+ // Do nothing.
+ break;
+ default:
+ gold_unreachable();
}
- else
- {
- if (shndx >= shnum)
- {
- this->error(_("local symbol %u section index %u out of range"),
- i, shndx);
- shndx = 0;
- }
-
- 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)
- {
- // This local symbol belongs to a section we are discarding.
- // In some cases when applying relocations later, we will
- // attempt to match it to the corresponding kept section,
- // so we leave the input value unchanged here.
- continue;
- }
- else if (secoffset == invalid_address)
- {
- uint64_t start;
-
- // This is a SHF_MERGE section or one which otherwise
- // requires special handling.
- if (shndx == this->discarded_eh_frame_shndx_)
- {
- // This local symbol belongs to a discarded .eh_frame
- // section. Just treat it like the case in which
- // os == NULL above.
- gold_assert(this->has_eh_frame_);
- continue;
- }
- else if (!lv.is_section_symbol())
- {
- // This is not a section symbol. We can determine
- // the final value now.
- lv.set_output_value(os->output_address(this, shndx,
- lv.input_value()));
- }
- else if (!os->find_starting_output_address(this, shndx, &start))
- {
- // 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)
- {
- Address relocatable_link_adjustment =
- relocatable ? os->address() : 0;
- lv.set_output_value(posd->address()
- - relocatable_link_adjustment);
- }
- else
- lv.set_output_value(os->address());
- }
- else
- {
- // We have to consider the addend to determine the
- // value to use in a relocation. START is the start
- // of this input section. If we are doing a relocatable
- // link, use offset from start output section instead of
- // address.
- Address adjusted_start =
- relocatable ? start - os->address() : start;
- Merged_symbol_value<size>* msv =
- new Merged_symbol_value<size>(lv.input_value(),
- adjusted_start);
- lv.set_merged_symbol_value(msv);
- }
- }
- else if (lv.is_tls_symbol())
- lv.set_output_value(os->tls_offset()
- + secoffset
- + lv.input_value());
- else
- lv.set_output_value((relocatable ? 0 : os->address())
- + secoffset
- + lv.input_value());
- }
-
- if (!lv.is_output_symtab_index_set())
- {
- lv.set_output_symtab_index(index);
- ++index;
- }
}
return index;
}
Sized_relobj<size, big_endian>::do_section_entsize(unsigned int shndx)
{
Symbols_data* sd = this->get_symbols_data();
- gold_assert (sd != NULL);
+ gold_assert(sd != NULL);
const unsigned char* pshdrs = sd->section_headers_data
+ This::shdr_size * shndx;
bool
is_elf_object(Input_file* input_file, off_t offset,
- const unsigned char** start, int *read_size)
+ const unsigned char** start, int* read_size)
{
off_t filesize = input_file->file().filesize();
int want = elfcpp::Elf_recognizer::max_header_size;