// ehframe.cc -- handle exception frame sections for gold
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
{
}
-// Set the final address and size of the exception frame header.
+// Set the size of the exception frame header.
void
-Eh_frame_hdr::do_set_address(uint64_t, off_t)
+Eh_frame_hdr::set_final_data_size()
{
unsigned int data_size = eh_frame_hdr_size + 4;
if (!this->any_unrecognized_eh_frame_sections_)
void
Eh_frame_hdr::do_write(Output_file* of)
{
- if (parameters->get_size() == 32)
+ switch (parameters->size_and_endianness())
{
- if (!parameters->is_big_endian())
- {
#ifdef HAVE_TARGET_32_LITTLE
- this->do_sized_write<32, false>(of);
-#else
- gold_unreachable();
+ case Parameters::TARGET_32_LITTLE:
+ this->do_sized_write<32, false>(of);
+ break;
#endif
- }
- else
- {
#ifdef HAVE_TARGET_32_BIG
- this->do_sized_write<32, true>(of);
-#else
- gold_unreachable();
+ case Parameters::TARGET_32_BIG:
+ this->do_sized_write<32, true>(of);
+ break;
#endif
- }
- }
- else if (parameters->get_size() == 64)
- {
- if (!parameters->is_big_endian())
- {
#ifdef HAVE_TARGET_64_LITTLE
- this->do_sized_write<64, false>(of);
-#else
- gold_unreachable();
+ case Parameters::TARGET_64_LITTLE:
+ this->do_sized_write<64, false>(of);
+ break;
#endif
- }
- else
- {
#ifdef HAVE_TARGET_64_BIG
- this->do_sized_write<64, true>(of);
-#else
- gold_unreachable();
+ case Parameters::TARGET_64_BIG:
+ this->do_sized_write<64, true>(of);
+ break;
#endif
- }
+ default:
+ gold_unreachable();
}
- else
- gold_unreachable();
}
// Write the data to the file with the right endianness.
template<int size, bool big_endian>
typename elfcpp::Elf_types<size>::Elf_Addr
-Eh_frame_hdr::get_fde_pc(const unsigned char* eh_frame_contents,
- off_t fde_offset, unsigned char fde_encoding)
+Eh_frame_hdr::get_fde_pc(
+ typename elfcpp::Elf_types<size>::Elf_Addr eh_frame_address,
+ const unsigned char* eh_frame_contents,
+ section_offset_type fde_offset,
+ unsigned char fde_encoding)
{
// The FDE starts with a 4 byte length and a 4 byte offset to the
// CIE. The PC follows.
break;
default:
+ // All other cases were rejected in Eh_frame::read_cie.
+ gold_unreachable();
+ }
+
+ switch (fde_encoding & 0xf0)
+ {
+ case 0:
+ break;
+
+ case elfcpp::DW_EH_PE_pcrel:
+ pc += eh_frame_address + fde_offset + 8;
+ break;
+
+ default:
+ // If other cases arise, then we have to handle them, or we have
+ // to reject them by returning false in Eh_frame::read_cie.
gold_unreachable();
}
++p)
{
typename elfcpp::Elf_types<size>::Elf_Addr fde_pc;
- fde_pc = this->get_fde_pc<size, big_endian>(eh_frame_contents,
+ fde_pc = this->get_fde_pc<size, big_endian>(eh_frame_address,
+ eh_frame_contents,
p->first, p->second);
fde_addresses->push_back(fde_pc, eh_frame_address + p->first);
}
// Write the FDE to OVIEW starting at OFFSET. CIE_OFFSET is the
// offset of the CIE in OVIEW. FDE_ENCODING is the encoding, from the
-// CIE. Record the FDE pc for EH_FRAME_HDR. Return the new offset.
+// CIE. ADDRALIGN is the required alignment. Record the FDE pc for
+// EH_FRAME_HDR. Return the new offset.
template<int size, bool big_endian>
-off_t
-Fde::write(unsigned char* oview, off_t offset, off_t cie_offset,
- unsigned char fde_encoding, Eh_frame_hdr* eh_frame_hdr)
+section_offset_type
+Fde::write(unsigned char* oview, section_offset_type offset,
+ unsigned int addralign, section_offset_type cie_offset,
+ unsigned char fde_encoding, Eh_frame_hdr* eh_frame_hdr)
{
+ gold_assert((offset & (addralign - 1)) == 0);
+
size_t length = this->contents_.length();
+ // We add 8 when getting the aligned length to account for the
+ // length word and the CIE offset.
+ size_t aligned_full_length = align_address(length + 8, addralign);
+
// Write the length of the FDE as a 32-bit word. The length word
// does not include the four bytes of the length word itself, but it
// does include the offset to the CIE.
elfcpp::Swap<32, big_endian>::writeval(oview + offset,
- length + 4);
+ aligned_full_length - 4);
// Write the offset to the CIE as a 32-bit word. This is the
// difference between the address of the offset word itself and the
// will later be applied to the FDE data.
memcpy(oview + offset + 8, this->contents_.data(), length);
+ if (aligned_full_length > length + 8)
+ memset(oview + offset + length + 8, 0, aligned_full_length - (length + 8));
+
// Tell the exception frame header about this FDE.
if (eh_frame_hdr != NULL)
eh_frame_hdr->record_fde(offset, fde_encoding);
- return offset + length + 8;
+ return offset + aligned_full_length;
}
// Class Cie.
// Set the output offset of a CIE. Return the new output offset.
-off_t
-Cie::set_output_offset(off_t output_offset, unsigned int addralign,
+section_offset_type
+Cie::set_output_offset(section_offset_type output_offset,
+ unsigned int addralign,
Merge_map* merge_map)
{
size_t length = this->contents_.length();
- gold_assert((length & (addralign - 1)) == 0);
+
// Add 4 for length and 4 for zero CIE identifier tag.
length += 8;
merge_map->add_mapping(this->object_, this->shndx_, this->input_offset_,
length, output_offset);
+ length = align_address(length, addralign);
+
for (std::vector<Fde*>::const_iterator p = this->fdes_.begin();
p != this->fdes_.end();
++p)
(*p)->add_mapping(output_offset + length, merge_map);
size_t fde_length = (*p)->length();
- gold_assert((fde_length & (addralign - 1)) == 0);
+ fde_length = align_address(fde_length, addralign);
length += fde_length;
}
}
// Write the CIE to OVIEW starting at OFFSET. EH_FRAME_HDR is for FDE
-// recording. Return the new offset.
+// recording. Round up the bytes to ADDRALIGN. Return the new
+// offset.
template<int size, bool big_endian>
-off_t
-Cie::write(unsigned char* oview, off_t offset, Eh_frame_hdr* eh_frame_hdr)
+section_offset_type
+Cie::write(unsigned char* oview, section_offset_type offset,
+ unsigned int addralign, Eh_frame_hdr* eh_frame_hdr)
{
- off_t cie_offset = offset;
+ gold_assert((offset & (addralign - 1)) == 0);
+
+ section_offset_type cie_offset = offset;
size_t length = this->contents_.length();
+ // We add 8 when getting the aligned length to account for the
+ // length word and the CIE tag.
+ size_t aligned_full_length = align_address(length + 8, addralign);
+
// Write the length of the CIE as a 32-bit word. The length word
// does not include the four bytes of the length word itself.
- elfcpp::Swap<32, big_endian>::writeval(oview + offset, length + 4);
+ elfcpp::Swap<32, big_endian>::writeval(oview + offset,
+ aligned_full_length - 4);
// Write the tag which marks this as a CIE: a 32-bit zero.
elfcpp::Swap<32, big_endian>::writeval(oview + offset + 4, 0);
// Write out the CIE data.
memcpy(oview + offset + 8, this->contents_.data(), length);
- offset += length + 8;
+
+ if (aligned_full_length > length + 8)
+ memset(oview + offset + length + 8, 0, aligned_full_length - (length + 8));
+
+ offset += aligned_full_length;
// Write out the associated FDEs.
unsigned char fde_encoding = this->fde_encoding_;
for (std::vector<Fde*>::const_iterator p = this->fdes_.begin();
p != this->fdes_.end();
++p)
- offset = (*p)->write<size, big_endian>(oview, offset, cie_offset,
- fde_encoding, eh_frame_hdr);
+ offset = (*p)->write<size, big_endian>(oview, offset, addralign,
+ cie_offset, fde_encoding,
+ eh_frame_hdr);
return offset;
}
eh_frame_hdr_(NULL),
cie_offsets_(),
unmergeable_cie_offsets_(),
- merge_map_()
+ merge_map_(),
+ mappings_are_done_(false),
+ final_data_size_(0)
{
}
Eh_frame::add_ehframe_input_section(
Sized_relobj<size, big_endian>* object,
const unsigned char* symbols,
- off_t symbols_size,
+ section_size_type symbols_size,
const unsigned char* symbol_names,
- off_t symbol_names_size,
+ section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
unsigned int reloc_type)
{
// Get the section contents.
- off_t contents_len;
+ section_size_type contents_len;
const unsigned char* pcontents = object->section_contents(shndx,
&contents_len,
false);
reloc_type, pcontents,
contents_len, &new_cies))
{
- this->eh_frame_hdr_->found_unrecognized_eh_frame_section();
+ if (this->eh_frame_hdr_ != NULL)
+ this->eh_frame_hdr_->found_unrecognized_eh_frame_section();
for (New_cies::iterator p = new_cies.begin();
p != new_cies.end();
p != new_cies.end();
++p)
{
- uint64_t zero = 0;
if (p->second)
- this->cie_offsets_.insert(std::make_pair(p->first, zero));
+ this->cie_offsets_.insert(p->first);
else
- this->unmergeable_cie_offsets_.push_back(std::make_pair(p->first,
- zero));
+ this->unmergeable_cie_offsets_.push_back(p->first);
}
return true;
Eh_frame::do_add_ehframe_input_section(
Sized_relobj<size, big_endian>* object,
const unsigned char* symbols,
- off_t symbols_size,
+ section_size_type symbols_size,
const unsigned char* symbol_names,
- off_t symbol_names_size,
+ section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
unsigned int reloc_type,
const unsigned char* pcontents,
- off_t contents_len,
+ section_size_type contents_len,
New_cies* new_cies)
{
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
Eh_frame::read_cie(Sized_relobj<size, big_endian>* object,
unsigned int shndx,
const unsigned char* symbols,
- off_t symbols_size,
+ section_size_type symbols_size,
const unsigned char* symbol_names,
- off_t symbol_names_size,
+ section_size_type symbol_names_size,
const unsigned char* pcontents,
const unsigned char* pcie,
const unsigned char *pcieend,
case elfcpp::DW_EH_PE_udata8:
break;
default:
+ // We don't expect to see any other cases here, and
+ // we're not prepared to handle them.
return false;
}
++p;
{
Cie_offsets::iterator find_cie = this->cie_offsets_.find(&cie);
if (find_cie != this->cie_offsets_.end())
- cie_pointer = find_cie->first;
+ cie_pointer = *find_cie;
else
{
// See if we already saw this CIE in this object file.
Eh_frame::read_fde(Sized_relobj<size, big_endian>* object,
unsigned int shndx,
const unsigned char* symbols,
- off_t symbols_size,
+ section_size_type symbols_size,
const unsigned char* pcontents,
unsigned int offset,
const unsigned char* pfde,
if (symndx >= symbols_size / sym_size)
return false;
elfcpp::Sym<size, big_endian> sym(symbols + symndx * sym_size);
- fde_shndx = sym.get_st_shndx();
+ bool is_ordinary;
+ fde_shndx = object->adjust_sym_shndx(symndx, sym.get_st_shndx(),
+ &is_ordinary);
- if (fde_shndx != elfcpp::SHN_UNDEF
+ if (is_ordinary
+ && fde_shndx != elfcpp::SHN_UNDEF
&& fde_shndx < object->shnum()
&& !object->is_section_included(fde_shndx))
{
this->unmergeable_cie_offsets_.begin();
p != this->unmergeable_cie_offsets_.end();
++p)
- ret += p->first->fde_count();
+ ret += (*p)->fde_count();
for (Cie_offsets::const_iterator p = this->cie_offsets_.begin();
p != this->cie_offsets_.end();
++p)
- ret += p->first->fde_count();
+ ret += (*p)->fde_count();
return ret;
}
// Set the final data size.
void
-Eh_frame::do_set_address(uint64_t, off_t start_file_offset)
+Eh_frame::set_final_data_size()
{
- off_t output_offset = 0;
+ // We can be called more than once if Layout::set_segment_offsets
+ // finds a better mapping. We don't want to add all the mappings
+ // again.
+ if (this->mappings_are_done_)
+ {
+ this->set_data_size(this->final_data_size_);
+ return;
+ }
+
+ section_offset_type output_offset = 0;
for (Unmergeable_cie_offsets::iterator p =
this->unmergeable_cie_offsets_.begin();
p != this->unmergeable_cie_offsets_.end();
++p)
- {
- p->second = start_file_offset + output_offset;
- output_offset = p->first->set_output_offset(output_offset,
- this->addralign(),
- &this->merge_map_);
- }
+ output_offset = (*p)->set_output_offset(output_offset,
+ this->addralign(),
+ &this->merge_map_);
for (Cie_offsets::iterator p = this->cie_offsets_.begin();
p != this->cie_offsets_.end();
++p)
- {
- p->second = start_file_offset + output_offset;
- output_offset = p->first->set_output_offset(output_offset,
- this->addralign(),
- &this->merge_map_);
- }
+ output_offset = (*p)->set_output_offset(output_offset,
+ this->addralign(),
+ &this->merge_map_);
+
+ this->mappings_are_done_ = true;
+ this->final_data_size_ = output_offset;
gold_assert((output_offset & (this->addralign() - 1)) == 0);
this->set_data_size(output_offset);
bool
Eh_frame::do_output_offset(const Relobj* object, unsigned int shndx,
- off_t offset, off_t* poutput) const
+ section_offset_type offset,
+ section_offset_type* poutput) const
{
return this->merge_map_.get_output_offset(object, shndx, offset, poutput);
}
+// Return whether this is the merge section for an input section.
+
+bool
+Eh_frame::do_is_merge_section_for(const Relobj* object,
+ unsigned int shndx) const
+{
+ return this->merge_map_.is_merge_section_for(object, shndx);
+}
+
// Write the data to the output file.
void
const off_t oview_size = this->data_size();
unsigned char* const oview = of->get_output_view(offset, oview_size);
- if (parameters->get_size() == 32)
+ switch (parameters->size_and_endianness())
{
- if (!parameters->is_big_endian())
- {
#ifdef HAVE_TARGET_32_LITTLE
- this->do_sized_write<32, false>(oview);
-#else
- gold_unreachable();
+ case Parameters::TARGET_32_LITTLE:
+ this->do_sized_write<32, false>(oview);
+ break;
#endif
- }
- else
- {
#ifdef HAVE_TARGET_32_BIG
- this->do_sized_write<32, true>(oview);
-#else
- gold_unreachable();
+ case Parameters::TARGET_32_BIG:
+ this->do_sized_write<32, true>(oview);
+ break;
#endif
- }
- }
- else if (parameters->get_size() == 64)
- {
- if (!parameters->is_big_endian())
- {
#ifdef HAVE_TARGET_64_LITTLE
- this->do_sized_write<64, false>(oview);
-#else
- gold_unreachable();
+ case Parameters::TARGET_64_LITTLE:
+ this->do_sized_write<64, false>(oview);
+ break;
#endif
- }
- else
- {
#ifdef HAVE_TARGET_64_BIG
- this->do_sized_write<64, true>(oview);
-#else
- gold_unreachable();
+ case Parameters::TARGET_64_BIG:
+ this->do_sized_write<64, true>(oview);
+ break;
#endif
- }
+ default:
+ gold_unreachable();
}
- else
- gold_unreachable();
of->write_output_view(offset, oview_size, oview);
}
void
Eh_frame::do_sized_write(unsigned char* oview)
{
- off_t o = 0;
+ unsigned int addralign = this->addralign();
+ section_offset_type o = 0;
for (Unmergeable_cie_offsets::iterator p =
this->unmergeable_cie_offsets_.begin();
p != this->unmergeable_cie_offsets_.end();
++p)
- o = p->first->write<size, big_endian>(oview, o, this->eh_frame_hdr_);
+ o = (*p)->write<size, big_endian>(oview, o, addralign,
+ this->eh_frame_hdr_);
for (Cie_offsets::iterator p = this->cie_offsets_.begin();
p != this->cie_offsets_.end();
++p)
- o = p->first->write<size, big_endian>(oview, o, this->eh_frame_hdr_);
+ o = (*p)->write<size, big_endian>(oview, o, addralign,
+ this->eh_frame_hdr_);
}
#ifdef HAVE_TARGET_32_LITTLE
Eh_frame::add_ehframe_input_section<32, false>(
Sized_relobj<32, false>* object,
const unsigned char* symbols,
- off_t symbols_size,
+ section_size_type symbols_size,
const unsigned char* symbol_names,
- off_t symbol_names_size,
+ section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
unsigned int reloc_type);
Eh_frame::add_ehframe_input_section<32, true>(
Sized_relobj<32, true>* object,
const unsigned char* symbols,
- off_t symbols_size,
+ section_size_type symbols_size,
const unsigned char* symbol_names,
- off_t symbol_names_size,
+ section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
unsigned int reloc_type);
Eh_frame::add_ehframe_input_section<64, false>(
Sized_relobj<64, false>* object,
const unsigned char* symbols,
- off_t symbols_size,
+ section_size_type symbols_size,
const unsigned char* symbol_names,
- off_t symbol_names_size,
+ section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
unsigned int reloc_type);
Eh_frame::add_ehframe_input_section<64, true>(
Sized_relobj<64, true>* object,
const unsigned char* symbols,
- off_t symbols_size,
+ section_size_type symbols_size,
const unsigned char* symbol_names,
- off_t symbol_names_size,
+ section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
unsigned int reloc_type);
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